MXPA97004889A - Structure of tuner and tuner of cable modem using the mi - Google Patents
Structure of tuner and tuner of cable modem using the miInfo
- Publication number
- MXPA97004889A MXPA97004889A MXPA/A/1997/004889A MX9704889A MXPA97004889A MX PA97004889 A MXPA97004889 A MX PA97004889A MX 9704889 A MX9704889 A MX 9704889A MX PA97004889 A MXPA97004889 A MX PA97004889A
- Authority
- MX
- Mexico
- Prior art keywords
- chassis
- tuner
- angle
- circuit board
- connector
- Prior art date
Links
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Abstract
A tuner structure is described which includes a circuit board on which electronic circuit components such as transistors and resistors have been mounted, an angle of the chassis, and a shield cover. In the structure of the tuner, a through capacitor to introduce / emit a power, control and the like signal is mounted to a metal plate arranged in parallel to the circuit board
Description
"STRUCTURE OF TUNER AND TUNER OF CABLE MODEM USING THE SAME" Background of the invention Field of the invention The present invention relates in general to a so-called
"tuner" or a front end of a radio frequency (RF) reception section integrated to a television transmitter / receiver or the like and more in particular is related to a tuner structure with a reduced thickness and a cable modem tuner who uses the same.
Description of the Related Art An exemplary conventional tuner structure is shown in Figure 18, from which a shield cover has been omitted. As shown in Figure 18, a circuit board 50 formed by assembling several circuit components (the respective circuit components are not shown) that includes resistors, capacitors, coils and transformers on a printed circuit board is incorporated into the circuit board. an angle 51 of the chassis (or the sides of a chassis arranged vertically with respect to the circuit board 50) having a folded metal plate structure. In general, a shield plate for isolating the internal circuits is also formed as an integral part of the angle 51 of the chassis. A signal received by means of an antenna or the like is introduced through a connector 52 mounted on a REF: 25027 side of the angle 51 of the chassis. In addition, terminals are also provided to supply power, connect control signals and recover output signals from internal circuits. Like the terminals, capacitor-integrated terminals of a special type called 'fcapacüa-est pasante 53 (or through terminals) are used. "A tuner has an oscillator circuit in it in general.As a result radio waves leak out of the tuner by means of the power supply terminals thereof and the like, to thereby cause unnecessary radiation.Also, when a noise is received through the terminals of the tuner, the noise is mixed adversely to the output of the tuner, Such a way that the output signal thereof deteriorates.The through terminals (or through capacitors) 53 are provided to deal with these problems.The angle 51 of the chassis, together with the shield cover, covers the body of the tuner and provides a satisfactory ground potential having a low impedance in an RF region The through capacitor 53 has such cross sectional structure as that most FIG. 19. In the through capacitor 53, a terminal rod 53A extends through a dielectric material 54 and an internal electrode 55 into the dielectric material 54 is electrically conductive satisfactorily with the terminal rod 53A via a layer 56 of welding formed around the terminal rod 53A. On the other hand, an external electrode 57 of the dielectric 54 is electrically conductive satisfactorily with the angle 51 of the chassis via a welding connection 58. Figures 20A and 20B respectively show a method for evaluating the effects of grounding for the case of using a through capacitor 53 and the case of using a chip capacitor (or flake type capacitor) 49 formed as a separate component. As shown in Figures 20A and 20B, the measurement is carried out by connecting an RF signal source 202 (having an impedance of the 50 O signal source) to a level meter 204 (which has a low level). impedance of 50 O), insertion of a capacitor that is going to be tested between a signal line and a ground connection between them and travel a frequency of 0 GHz to 3 GHz. The capacitor is connected to a pair of cables coaxial 48 having an impedance of 50 O connected to the source 202 of the RF signal and the level meter 204 respectively. Figures 21 A and 21 B show respectively the results for the case of using the capacitor 53 and the case of using the capacitor 49 of the type of flake. As you can see from these figures, in the case of using the through capacitor 53, more satisfactory attenuation characteristics are performed in the frequency region of approximately 0.5 GHz or greater. The reason is supposedly as follows. Since the external electrode 57 of the through capacitor 53 is directly connected to the angle 51 of the tuner chassis, no parasitic inductance is generated between them, in such a way that satisfactory grounding effects are realized. On the other hand, in the case where a capacitor is formed as a separate component (for example the capacitor of the type of chip 49) is provided between a terminal and a ground connection instead of using the capacitor 53, it can be obtained the same effects as those of the through capacitor 53 in a low frequency region. However, since a form of copper shielding inevitably exists when the electrode of the slit-type capacitor 49 is connected to a terminal or ground and the capacitor 49 itself has a metal electrode configuration therein, this configuration functions as parasitic inductance. As a result, in a region of high frequency (for example, 0.5 GHz or greater) where the influence of these parasitic inductances is not negligible, the expected attenuation characteristics can not be obtained. The tuner can be mounted on a main substrate 64 either in a vertical mounting manner shown in Figures 22A and 22B or in a horizontal mounting manner shown in Figures 23A and 23B. Fig. 22A is a plan view showing a side on which an inlet terminal or connector 52 is mounted, while Fig. 22B is a plan view showing the side orthogonal to the side shown in the figure 22A. On the other hand, Figure 23A is a plan view showing the side on which an input terminal or connector 52 has been mounted, while Figure 23B is a plan view showing the side orthogonal to the side shown. in Figure 23A. The horizontal mounting shape shown in Figures 23A and 23B is used for the case where the space in the vertical direction to the substrate 64 on which the tuner is mounted is limited. For example, this type of assembly is used to mount a tuner on a large board of a personal computer. Figure 26 shows an exemplary internal structure of a conventional tuner structure to be mounted on a substrate 64 in the horizontal mounting manner shown in Figures 23A and 23B. The chip components 60 and the insertion components 61, such as coils, have been mounted on a circuit board 50. A through capacitor 53 has been attached to a chassis angle 51 arranged vertically to the circuit board 50. The leg 53a of the through capacitor 53 is folded at a right angle, to electrically and mechanically connect the capacitor 53 through to the main substrate 64. The external sides of the tuner are covered with shield covers 65 and the tuner is electrically and mechanically connected to the main substrate 64 via the leg 51a of the angle 51 of the chassis. Next, the wiring process for mounting a tuner will be briefly described. (1) First, the components 60 and the insertion components 61, such as coils which have provisionally adhered to the circuit board 50 inside the tuner are connected by a flow welding method in which the surface of the configuration The copper sheet of the circuit board 50 is immersed in a solder tank filled with molten solder. (2) Second, the extra line portion of a tab line of each of the insert components 61 such as coils is cut. (3) Finally, the circuit board 50 is inserted into the angle 51 of the chassis to which the through capacitors 53 and the input connector 52 have been connected. Then, the circuit board 50 is connected to the angle 51 of the chassis, the terminals of the through capacitors 53 are connected to the terminal of the input connector 52 by a flow welding method similar to that described in (1). However, a conventional tuner structure has the following problems. For example, in the tuner structure of the horizontal mounting type shown in FIGS. 23A and 23B, since the through capacitors 53 extend from one side of the chassis angle 51, the legs 53a thereof are required to be used. as terminals fold. In the case of using such a tuner structure, the following disadvantages can not be prevented. (1) Since the terminals 53a protrude from the angle 51 of the chassis, the area of the main substrate 64 required for mounting the tuner thereon is increased. (2) The terminals 53a protruding from the angle 51 of the chassis are so long that the portions of the terminals 53a are deflected possibly due to the contact of the terminals 53a with something during the manufacturing process of the tuner, during the transportation of the tuner or during the assembly process of the tuner on the main substrate 64. Once the positions of the terminals 53a have been diverted, it becomes difficult to mount the tuner on the main substrate 64. In order to prevent such a deviation, it is necessary to provide an element to retain terminals 53a, which partially increases costs. (3) When the through capacitors 53 are provided to protrude from one side of the chassis angle 51, an additional horizontal space must be reserved for them. Since the space is added to the space reserved for a ratchet to contact the shield cover 65 with the angle 51 of the chassis, the thickness of the tuner can not be designed to be thin. Furthermore, even if problems about the terminals can be solved by some means, when a tuner uses a coaxial connector to connect an input signal to the tuner, the size of the coaxial connector itself prevents the tuner thickness from being reduced. The size of a connector is standard for the convenience of the users in general. Thus, a tuner with a reduced thickness can not be realized due to the limitation of the size of the connector. In other words, you can not use a connector of a special type that is small in size to reduce the thickness of a tuner.
In Japan, the United States of America, and other countries, an input connector called a "type F connector (or contact derivation F)" is used, as shown in Figure 24. In Figure 24, the size of the connector Type F 240 is defined as follows: the external diameter of the threaded portion 66 is defined as 9.4 mm f and the external diameter of the surface 68 to be brought into contact with the side of the angle 51 of the chassis is 11.0 mm f. Thus, it is difficult to obtain a tuner structure having a thickness less than the outer diameter of 11.0 mm f of the surface 68 that is to be brought into contact with the side of the angle 51 of the chassis. Figure 25 is a plan view of a tuner structure to which a conventional type F connector 240 is mounted. In Figure 25, the reference numeral 65 denotes a top shield cover and a bottom shield cover; 53 denotes a through capacitor; and 51 denotes a chassis angle. When the thickness of the angle 51 of the chassis and of the tuner are denoted by C and D, respectively, the following relationship is satisfied as shown in Figure 25: (External diameter of the surface 68 of the type F 240 connector to be placed in contact with the side of angle 51 of the chassis: 11.0 mm f) < (Thickness C of chassis angle 51) < (Thickness D of the tuner). For example, the thicknesses C and D are adjusted to the following specific values: C = approximately 12.3 mm to approximately 12.9 mm D = approximately 14.0 mm to approximately 17.0 mm The thickness C of the chassis angle 51 is designed to be greater than the diameter external of the input connector 240, to ensure the mounting resistance of the input connector 240. Since a relatively coarse coaxial cable is generally connected to the input connector 240, it is likely that an input connector 240 having a weak mechanical strength deforms the angle 51 of the chassis. In addition, drafting (to inflate the shielding covers 65 and the like) is required to ensure sufficient strength for the shielding covers 65 themselves and to securely engage with the internal shielding plates (shield plates). partition) of the angle 51 of the chassis with the shielding covers 65 via ratchets. Thus, the thickness of the tuner structure must also be increased due to the draw and becomes somewhat greater than that of the input connector 240. A conventional tuner structure and a cable modem tuner utilizing the same has the following problems : (1) Subdimensioning a tuner structure Since a modem cable is used as a pepfépco component of a personal computer, it is required that such a modem be reduced in size. However, since it is difficult to reduce the thickness of a tuner, the shape of a tuner must be modified. (2) Improvement of the resistance of a chassis of a tuner structure.
A Type F contact lead is used as an input terminal for a modem cable. When a coaxial cable is connected to the F-type contact shunt, a load of 20 Kg or more is applied to the F-type contact shunt, so that the chassis, to which the input terminal of the tuner is required, is required. ensure, have a resistance strong enough to withstand a heavy load. (3) Improvement of the shielding effects of a cable modem tuner. A cable modem tuner must be connected to a cable line such as a CATV device, such that other equipment (such as a higher converter) is not affected by a spurious alteration. Thus, in comparison with a conventional TV tuner, the spurious level in the input terminal thereof must be improved. However, although a cable modem tuner, to which a duplex circuit has been integrated, can transmit and receive data bidirectionally, a conventional TV tuner has no function of mixing an upstream signal and thus a duplexer circuit must be provided additionally for it. When such a circuit is a, the filter thereof must be shielded. In addition, since a cable modem tuner is a peripheral component of a personal computer, the tuner is arranged in the vicinity of the personal computer in most cases. Since the cable modem is frequently exposed to digital noise generated from the personal computer, it is necessary to take some measures against the incoming disturbance signals.
BRIEF DESCRIPTION OF THE INVENTION According to the present invention, a tuner structure is provided which includes a circuit board on which electronic circuit components such as transistors and resistors, a chassis angle and a shield cover have been mounted. In the structure of the tuner, a through capacitor for introducing / emitting a power, control and the like signal is mounted to a metal plate arranged in parallel to the circuit board. In one embodiment, the metal plate to which the through capacitor is mounted has been subjected to mechanical processing. In another embodiment, the through capacitor is mounted to a metal grounding plate provided separately from the chassis angle. In yet another embodiment, the grounding plate has a box shape. In yet another embodiment, the chassis angle is formed by mounting a metal plate to which an inlet connector is mounted to another folded metal plate. In yet another embodiment, the metal plate to which the input connector is mounted has a portion having an increased width.
In still another embodiment, the metal plate to which the input connector is mounted has a plurality of small holes. According to another aspect of the present invention, a tuner structure is provided which includes a circuit board on which electronic circuits such as transistors and resistors, a chassis angle and a shield cover have been mounted. In the structure of the tuner, a terminal connector for introducing / outputting a power, control and the like signal is mounted to a metal plate arranged in parallel to the circuit board. According to still another aspect of the present invention, a tuner structure includes: a circuit board on which electronic circuit components such as transistors, resistors and through capacitors have been mounted; a chassis angle is provided which includes a pair of shorter sides of the chassis, a pair of longer sides of the chassis and a central plane of the chassis angle; a shield cover and an input connector. In the structure of the tuner when an external diameter of a surface of the input connector to be brought into contact with one side of the pairs of the shorter sides of the frame angle of the chassis and a thickness of the chassis angle are denoted by A and B, respectively, a ratio of A > B. In one embodiment, the pair of shorter sides of the chassis angle chassis to which the inlet connector is mounted is provided with extruded and extracted portions and portions drawn outwardly around an outer circumference of a hole for inserting the inlet connector the same. In another embodiment, each of the longer sides of the chassis angle frame is provided with extruded and ejected portions and extruded ratchet portions, thereby forming a mechanism for retaining the circuit board. In still another embodiment, the tuner structure further includes a mechanism for mounting the through capacitors on the circuit board from the inside of the chassis angle. In yet another embodiment, a notch portion is provided for the shield cover to contact one of the extracted portions outwardly from the shorter side of the chassis of the chassis angle to which the input connector is mounted. In still another embodiment, the pair of the shorter sides of the chassis, the pair of longer sides of the chassis and the central plane of the chassis angle of the chassis angle are formed by processing a single flat metal plate. According to yet another aspect of the present invention, a cable modem tuner is provided. The cable modem tuner includes a tuner structure that includes: a circuit board on which electronic circuit components such as transistors, transistors and through-capacitors have been mounted; a chassis angle that includes a pair of shorter sides of the chassis, a pair of longer chassis sides, and a center plane of the chassis angle; a shield cover; and an inlet connector, an external diametre A of a surface of the input connector, which is to be brought into contact with one of the pair of chassis sides shorter than the angle of the chassis that is longer than a thickness B of the angle of the chassis. The tuner of the cable modem also includes: radio frequency amplifier input tuner circuits corresponding to respectively different frequency bands; radio frequency amplifiers; output tuner circuits of the radio frequency amplifier; frequency converter circuits; local oscillator circuits; an intermediate frequency amplifier circuit; a SAW filter circuit; an intermediate frequency amplifier circuit such as a post-stage amplifier circuit and PLL selector circuits. Thus, the invention written in the present makes possible the advantages of (1) providing a tuner structure having a reduced thickness and occupying a smaller area on a main substrate, when the structure of the tuner is mounted on it and ( 2) provide a cable modem tuner that uses the same. These and other advantages of the present invention will become apparent to those skilled in the art upon reading and understanding the detailed description with references to the appended figures.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic cross-sectional view of a tuner structure using a through capacitor in a first example of the present invention. Figure 2 is a plan view showing one side of a tuner structure using a through capacitor in a second example of the present invention, to which side an input equalizer has been connected. Figure 3 is a schematic cross-sectional view of a tuner structure in a third example of the present invention, in which the four-pass capacitor 4, is attached to a metal plate mechanically processed and concave inwardly. Figures 4A and 4B are views for illustrating a tuner structure in a fourth example of the present invention: Figure 4A is a perspective view of a metal grounding plate 12, to which the through capacitors 4 are attached; and Figure 4B is a schematic cross-sectional view of the structure of the tuner to which the metal grounding plate 12 has been incorporated. Figure 5 is a schematic cross-sectional view of a tuner structure in a fifth example of the present invention, in which the metal grounding plate 12 is arranged in contact with the angle 8 of the chassis.
Figure 6A and 6B are views for illustrating a tuner structure in a sixth example of the present invention: Figure 6A is a perspective view of a box-shaped metal grounding plate 14, to which 4 interns capacitors join; and Figure 6B is a schematic cross-sectional view of the structure of the tuner to which the metal, box-shaped ground connection plate 14 has been incorporated. Figure 7 is an exploded perspective view of a chassis angle which is used for a tuner structure in a seventh example of the present invention and has been designed in view of the size limitation given by a coaxial connector or the input connector on the angle of the chassis. Figures 8A and 8B are views for illustrating a tuner structure in an eighth example of the present invention: Figure 8A is a perspective view of a metal plate 20 for mounting the input connector thereto, for which plate a hole 21 is provided for mounting the inlet connector therethrough, the holes 22 for contacting the inlet 20 with the angle of the chassis and a plurality of welding absorbent holes 23 (small holes); and Figure 8B is a schematic perspective view of the structure of the tuner to which the metal plate 20 has been attached. Figures 9A and 9B are views for illustrating a tuner structure using a terminal manifold in a ninth example of the present invention: Figure 9A is a perspective view of the terminal manifold 25; and Figure 9B is a schematic cross-sectional view of the tuner structure using the terminal manifold 25. Figures 10A to 10C show the external appearance of a tuner structure in the tenth example of the present invention, to which a type F connector and a shield cover have been joined: Figure 10A is a plan view of the structure of the tuner; Figure 10B is a side view of a longer side thereof; and Figure 10C is a side view of a shorter side thereof. Figures 11 A to 11 D show a mounted chassis angle of the tuner structure in the tenth example of the present invention: Figure 11A is a side view of a shorter side 111 of the chassis; Figure 11B is a plan view of the folded angle of the chassis or a central plane 115 of the angle of the chassis; Figure 11C is a side view of a longer side 113 of the chassis; and Figure 11 D is a side view of a shorter side 112 of the chassis. Figure 12 is a plan view of an unfolded angle of the chassis of the tuner structure in the tenth example of the present invention. Figures 13A to 13C illustrate how a circuit board is incorporated into the tuner structure in the tenth example of the present invention: Figure 13A is a plan view seen from the longer side 113 of the chassis; Figure 13B is a cross-sectional view thereof; and Figure 13B is a plan view thereof.
Figures 14A to 14C illustrate a structure for mounting a type F connector on the structure of the tuner in the tenth example of the present invention and how caulking is carried out: Figure 14A is a cross-sectional side view showing a structure for the assembly of the type F connector; Figure 14B is a vertical cross-sectional view illustrating the caulking of the type F connector; and Figure 14C is a partial enlarged view of Figure 14B. Figure 15 is a side cross-sectional view to illustrate a structure for mounting a through capacitor on the tuner structure in the tenth example of the present invention. Figures 16A and 16D are side views illustrating various forms of the partition plates to be provided on the central plane 115 of the chassis angle during assembly of the tuner structure in the tenth example of the present invention: Figure 16A are side views showing only the shapes of the partition plates; and Figure 16B are side views illustrating the positional relationships between the circuit board and the partition boards in various ways. Figures 17A and 17B illustrate an exemplary cable modem tuner in the eleventh example of the present invention, to which the tuner structure has been applied in the tenth example of the present invention: Figure 17A is a block diagram of the components of the electrical circuit formed in the tuner of the cable modem and Fig. 17B is a plan view showing the arrangement of the respective electrical circuit components shown in Fig. 17A in the structure of the tuner. Figure 18 is a perspective view of a conventional tuner structure. Figure 19 is a schematic cross sectional view of a through capacitor. Figures 20A and 20B are respective schematic representations showing a method for evaluating the effects of grounding for the case of using a through capacitor and the case of using a flake type capacitor formed as a separate component. Figures 21 A and 21 B are respective graphs showing the measurement results that represent the effects of ground connection for the case of using the through capacitor and the case of using the capacitor of the type of lasca as a separate component. Figures 22A and 22B are views illustrating how a tuner is mounted on a main substrate: Figure 22A is a plan view showing a side, to which an input terminal has been attached, of a tuner structure going to be mounted on the main substrate in a vertical mounting manner; and Figure 22B is a plan view showing the orthogonal side shown in Figure 22A. Figures 23A and 23B are views illustrating how a tuner is mounted on a main substrate: Figure 23A is a plan view showing a side to which an input terminal of a tuner structure to be mounted on the top has been attached. main substrate in a horizontal mounting form; and Figure 23B is a plan view showing the orthogonal side to the side shown in Figure 23A. Figure 24 is a perspective view of a type F connector. Figure 25 is a plan view of a conventional tuner structure using the type F connector. Figure 26 is a schematic cross-sectional view of a tuner structure. conventional.
Description of the preferred modalities. Hereinafter, the present invention will be described by way of illustrative examples with reference to the accompanying drawings.
Example 1 Figure 1 is a schematic cross-sectional view showing the internal structure of a tuner structure using a through capacitor in a first example of the present invention. The chip components 2 and the insertion components 3 such as coils have been mounted on a circuit board 1. A through capacitor 4 is mounted vertically through the circuit board 1 and is mounted through a metal plate 5 arranged in parallel to the circuit board 1 to extend through the circuit board 1 and the metal plate 5 to reach a main substrate 6. On the other hand, the body 7 of the tuner is electrically and mechanically connected to the main substrate 6 via the legs 8a of an angle 8 of the chassis. A cover 9 of upper and lower shielding is secured to the external surfaces of the tuner. Since a through capacitor 4 is used, a tuner having satisfactory RF characteristics and a reduced thickness can be realized.
Example 2 Figure 2 is a plan view showing a side, to which an input connector is mounted, of a tuner structure using a type F connector. In figure 2 the number 10 denotes the connector (input) type F); 9 denotes the shield covers; 4 denotes a through capacitor; 8 denotes an angle of the chassis and 8a denotes the legs of angle 8 of the chassis. When the thicknesses of the chassis angle 8 and the tuner are denoted by C and D respectively, the following relationship is satisfied as shown in Figure 2: (Thickness C of chassis angle 8) < (Thickness B of the tuner) For example, the thicknesses C and D are set to the following specific values: C = approximately 8.9 mm at approx. 9.5 mm D < 11.5 mm Thus, the thickness C of the angle 8 of the chassis is smaller than the diameter of a surface of the connector type F (11.0 mm) to be contacted with the angle 8 of the chassis.
Example 3 Figure 3 is a schematic cross-sectional view showing the internal structure of a tuner structure using a through capacitor in a third example of the present invention. The third example is different from the first example shown in Figure 1 in which a plate is formed by (mechanical) processing of the metal plate 5 through which the through capacitor 4 is mounted, such that the plate 11 of metal becomes concave inwards (that is, towards the surface of circuit board 1 which faces the metal plate 11). As shown in Figure 3 the components 2 of the chip and the insertion components 3 such as coils have been mounted on a circuit board 1. A through capacitor 4 is vertically mounted which is shown vertically through the circuit board 1 and is mounted through the metal plate 11 arranged in parallel and concave inwardly with respect to the circuit board 1 to extend through the board 1 of circuits and the metal plate 11 until reaching a main substrate 6. On the other hand, the body 7 of the tuner is electrically and mechanically connected to the main substrate 6 via the legs 8a of an angle 8 of the chassis. A top and bottom armor cover 9 are secured to the external surfaces of the tuner. Because a through capacitor 4 is used, a tuner can be made having satisfactory RF characteristics and a reduced thickness additionally. Specifically, the metal plate 11 is concave inwardly by about one mm to about 2 mm, thereby improving the mechanical strength of the plate 11 and further reducing the distance between the covers 9 of the upper and lower armor or the thickness of the plate. tuner
Example 4 Figures 4A and 4B show a structure of the tuner in a fourth example of the present invention. Although the through capacitor 4 is mounted on the metal plate 11 mechanically processed to be concave inwardly in the third example shown in FIG. 3, a grounding plate 12 is provided separately in this fourth example. Figure 4A is in the perspective view of such a metal ground connection plate 12, to which the through capacitors 4 are mounted. The metal grounding plate 12 is electrically and mechanically connected to the circuit board 1 via the legs 12a of the metal grounding plate 12. The reference number 13 denotes the insertion holes on which the capacitors 4 are inserted and mounted. The metal grounding plate 12 is electrically connected to the angle 8 of the chassis via the wires of the circuit board 1. Figure 4B is a schematic cross-sectional view of the structure of the tuner to which the metal grounding plate 12 has been incorporated. As shown in Figure 4B the chip components 2 and the insertion components 3 such as coils have been mounted to the circuit board 1. The through capacitor 4 is mounted vertically through the circuit board 1 and the metal ground connection plate 12 is arranged in parallel to the circuit board 1. The through capacitor 4 is inserted into the insertion hole 13 of the metal grounding plate 12 and one end of the through capacitor 4 reaches the main substrate 6 to be electrically and mechanically connected to the main substrate 6. On the other hand, the body 7 of the tuner is electrically and mechanically connected to the main substrate 6 via the legs 8a of an angle 8 of the chassis. A cover 9 of upper and lower shielding is secured to the external surfaces of the tuner. Because a through capacitor 4 is used, a tuner can be made having satisfactory RF characteristics and a reduced thickness additionally. In this example, since the ground connection of the circuits (on the circuit board 1) is directly connected to the through capacitors 4, a parasitic inductance to be generated can be reduced, in such a way that the attenuation is improved.
Example 5 Figure 5 shows a tuner structure in a fifth example of the present invention which is a variant of the example shown in Figures 4A and 4B. In this fifth example, the metal grounding plate 12 is electrically and mechanically connected to the circuit board 1 and is provided to be in contact with the angle 8 of the chassis. Such a structure not only increases the mechanical strength of the plate 12 but also ensures a more satisfactory ground potential more easily and a lower impedance in an RF region. In Figure 5, the reference number 1 denotes a circuit board; 2 denotes the components of the chip; 3 denotes the insertion components such as coils; 4 denotes a through capacitor; 6 denotes a main substrate; 8 denotes a chassis angle; and 9 denotes a top and bottom shield cover. The metal grounding plate 12 to which the through capacitor 4 is mounted is arranged in parallel to the circuit board 1. Because a through capacitor 4 is used, a tuner having satisfactory RF characteristics and a thickness reduced further. In this example, since the metal grounding plate 12 is in contact with the chassis angle 8, the ground connection of the main substrate 6 is satisfactorily brought into contact with the ground connection of the circuit board 1 via the legs 8a of the angle 8 of the chassis in such a way that the parasitic inductance is reduced.
Example 6 Figures 6A and 6B show a tuner structure in a sixth example of the present invention. Although the through capacitor 4 is mounted on a metal grounding plate 12 provided separately in the fourth example shown separately in FIGS. 4A and 4B, the metal grounding plate 12 is formed in a box configuration in this sixth example (hereinafter, reference will be made to such a metal grounding plate as a box-shaped metal grounding plate 14). Figure 6A is a perspective view of such a box-shaped metal grounding plate 14 to which the through capacitors 4 are mounted. The metal grounding plate 14 is electrically and mechanically connected to the circuit board 1 via the legs 14a of the box-shaped metal grounding plate 14. The reference number 13 denotes the insertion holes to which the through capacitors 4 are inserted. The box-shaped metal ground plate 14 is electrically connected to the chassis angle 8 via the wires of the circuit board 1. Figure 6B is a schematic cross-sectional view of the structure of the tuner to which the box-shaped metal grounding plate 14 has been incorporated. As shown in Figure 6B, the chip components 2 and the insertion components 3 such as coils have been mounted on the circuit board 1. The through capacitor 4 is mounted vertically from the circuit board 1 and the box metal ground connection plate 14 is arranged in parallel to the circuit board 1. The through capacitor 4 is inserted into a corresponding insertion hole 13 of the box-shaped metal ground plate 14 and one end of the through capacitor 4 reaches the main substrate 6 to be electrically and mechanically connected to the main substrate 6. On the other hand, the body 7 of the tuner is electrically and mechanically connected to the main substrate 6 via the legs 8a of an angle 8 of the chassis. A cover 9 of upper and lower armor is secured to the external surfaces of the tuner. Because the metal grounding plate 14 has a box shape, several components can be disposed inside the box-shaped metal grounding plate 14. Thus, the metal box-shaped ground connection plate 14 can also function as a case or shield box. further, as shown in FIG. 6B, a pawl 28 for the cover 9 of the upper shield is provided, such that the pawl 28 is brought into strong contact with the metal plate 14 in the form of a box by means of the spring pressure of the shield cover 9. As a result, the grounding effects of the metal grounding plate 14 can be better. Because a through capacitor 4 is used, a tuner can be made that has satisfactory RF characteristics and a reduced thickness additionally. In this example, the components inside the shield box or plate 14 of metal ground in the form of a box can be sealed therein. Thus, even when an oscillator is provided therein, the radiation waves thereof do not leak out of the tuner
Example 7 Figure 7 shows a tuner structure in a seventh example of the present invention, which has been designed in view of the limitations given by the size of a coaxial connector. More specifically, in this seventh example, a side 15 to which an inlet connector is mounted is separated (or separately) from an angle 18 of the chassis "in order to reduce the thickness of the chassis angle and thereby reduce the thickness total tuner. That is, the structure of the tuner of the seventh example has a structure in which the angle of the chassis is obtained by mounting a metal plate 15 to which the input connector is mounted to the other parts of the chassis angle 18. In addition, the metal plate 15 to which the inlet connector is mounted has a portion with an increased width. However, the mechanical strength of the mounted chassis angle can not be sufficiently retained once the inlet connector is attached to the metal plate 15. The portions of the upper and lower end of the metal plate 15 to which the inlet connector is mounted, are provided with folded portions formed by a stretching or stretching. When the metal plate 15 for mounting the input connector thereto is provided separately from the angle 18 of the chassis, the following advantages can be obtained: the material and the thickness of the chassis angle can be selected arbitrarily; an arbitrary stretching or stretching can be carried out at a desired folding size; the input connector can be mounted on an arbitrary position on the metal plate 15; the flexibility in design is greater; and an optimal metal plate such as the metal plate 15 can be used to mount the input connector thereon. In this example, the metal plate 15 for mounting the inlet connector thereto is made from a steel plate coated with tin having a thickness of about 0.6 mm. As shown in Figure 7, a processed metal plate or metal plate 15 is provided to mount the input connector thereto.
The metal plate 15 has a hole 16 through which the inlet connector "is mounted and the holes 17 through which the metal plate 15 is coupled with and mounted on the angle 18 of the chassis. metal is mounted with the angle 18 of the chassis via the holes 17, to thereby form a case or case of the chassis In figure 7, the reference number 19 denotes the partition plates to improve the shielding effects. of the chassis is mounted, the appearance of it is the same as that shown in figure 2
Example 8 Figures 8A and 8B show a tuner structure in an eighth example of the present invention, which is a variant of the example shown in Figure 7. As shown in Figure 8A, a metal plate 20 for mounting the connector inlet is provided not only with a die 21 through which the inlet connector is mounted and the holes 22 through which the plate 20 engages with the chassis angle 18, but also with multiple small holes 23 for absorbing welding through them (hereinafter, "opposites" will be referred to as "holes that absorb the weld"). The holes 23 that absorb the weld are often provided on the side of the metal plate 20 which is to be submerged in the weld. A chassis box is formed by mounting the metal plate 20 to the chassis angle 18. In Figure 8B, the reference number 19 denotes partition plates to improve the shielding effects. By providing the multiple small holes 23 for one of the stretched sides of the metal plate 20 which is to be submerged in the weld, the external size of the metal plate 20 can be prevented from being inappropriate, since the weld is not collected on the metal plate 20 but is absorbed through the holes 23. Figure 8B is a perspective view of the chassis box to which the inlet connector is to be mounted. In Japan, the United States of America and other countries, a so-called "F-type" input connector is used. The type F input connector has a threaded portion on the external circumference thereof. The threaded portion is usually fastened to and secured with the chassis of a receiver with integrated tuner via a nut. In Figure 8B, a chassis body is formed by mounting the metal plate 20 to the chassis angle 18. In Fig. 8B, the reference numeral 19 denotes partition plates to improve the shielding effects and the reference number 24 denotes an input connector (eg, an input connector type F). As shown in Figure 8B, the metal plate 20 for mounting the input connector thereto has many folded portions. When a tuner is mounted, the metal plate 20 is subjected to a process step of welding the flow. In general, it is likely that the weld is collected on and adhered to the folded portions during this stage of the process. As a result, the thickness of the tuner box is increased due to the bonded weld and because the tuner box size accuracy frequently can not be maintained. However, since multiple holes 23 are provided that absorb the weld for the folded portions of the metal plate 20 for mounting the inlet connector thereto, the weld is absorbed therethrough and the precision of the size of the weld. the tuner box can be maintained. In addition, it is required that the width of the portion of the metal plate 20 for mounting the input connector thereto be a little larger than the size of the nut used to hold the input connector 24. The reason is as follows. The torque generated when the input connector 24 is clamped with the nut or when the input connector 24 is clamped with an antenna cable connector is large. Thus, it is likely that the chassis angle will be deformed if the width of the chassis angle of the tuner is decreased and the size of the chassis angle margin except for the size of the input connector is small.
Example 9 Figures 9A and 9B show a tuner structure in a ninth example of the present invention, showing an implementation for making a tuner with a reduced thickness, in which a commonly used terminal, called a "terminal collector" which It has no capacitor function, it is provided instead of a through capacitor. Figure 9A is a perspective view of the terminal manifold 25 in which the manifold terminals 26 are maintained by a retention element 27 made of a resin via a predetermined space therebetween. Figure 9B is a schematic cross-sectional view of a tuner structure using the terminal manifold 25. In the tuner structure of the ninth example of the present invention shown in Figure 9B, the chip components 2, the capacitor 2a of the chip and the insertion components 3 such as coils have been mounted on a circuit board 1. The terminal manifold 25 is arranged vertically with respect to the circuit board 1 and extends through the metal plate 5 arranged in parallel to the circuit board 1 to be mounted directly on the main substrate 6. In addition, the tuner is electrically and mechanically connected to the main substrate 6 via the legs 8a of the chassis angle 8. The reference number 9 denotes the shield covers. The ninth example using the terminal manifold 25 can eliminate the conventional mechanical disadvantages. However, even when a capacitor is connected between a terminal and a ground connection, the electrical performance of the terminal collector 25 is less than that of a through capacitor with respect to the radio frequency characteristics. More specifically, it is more likely that an RF signal leaks from the terminal and the capacity of the terminal collector 25 to prevent external disturbance is less than that of a through capacitor. Thus, such a terminal collector 25 is used for a tuner applicable to a particular frequency.
Example 10 Figure 12 is a plan view of a non-folded chassis angle of a tuner structure in a tenth example of the present invention. As shown in Figure 12, a metal surface for a chassis box includes the five regions of: two shorter sides 111 and 112 of the chassis; two sides of chassis 113 and 114 longer; and a central plane 115 of the chassis angle. In Figure 12, the shaded regions are regions to be stamped by a stamping process. A rectangular parallelepiped tuner structure of the present invention is formed from the single metal plate 110 for a chassis box by subjecting a single metal flat plate (having a thickness of about 0.6 mm) to various kinds of processing such as stamping, stretching, stretching, ejection and bending. The shorter side 111 of the chassis will now be described. The shorter side 111 of the chassis is a side to which an inlet connector is mounted. In Figure 12, the reference number 116 denotes a hole to which the input connector (a type F connector or a contact branch F) is inserted and 117 and 118 denote the extruded and stretched portions which have been processed to protrude down from the plane of the shorter side 111 of the chassis (that is, to project vertically and descendingly from the sheet of paper). If these portions 117 and 118 are ejected and stretched to project upwardly from the plane of the shorter side 111 of the chassis (that is, to protrude vertically and upwardly from the sheet of paper), when a type F connector is clamped when fastening the annuli of the connector, then the portions 117 and 118 are brought into contact with a clamping template, in such a way that the clamping can not be carried out satisfactorily. In order to avoid such a situation, these portions 117 and 118 are made to protrude downward from the shorter side 111 of the chassis. As well, these ejected and stretched portions 117 and 118 are formed in circular configurations around the orifice 116 to insert the inlet connector thereto, thereby increasing the mechanical strength thereof. In addition, the ejected and stretched circular portion 117 is formed in a p-configuration from which two corners protrude, thereby increasing the mechanical strength thereof. Although the extruded and stretched portions 118 are formed in a short circular configuration due to the limited space thereof, these portions 118 may also be formed in a p-configuration similar to that of the portion 117. A pair of portions 119 provided above and below the outer circumference of the hole 116 for inserting the type F connector thereto are outwardly stretched portions which are to be bent to project vertically and descendingly from the sheet of paper and are to be stretched over the edges. flange portions thereof. As will be described later, the mechanical strength of the chassis angle is increased by providing the outwardly stretched portions 119 and the extruded and stretched portions 117 and 118.
A pair of stamped portions 120 and an extruded ratchet portion 121 which are provided on the right side of the hole 116 for inserting the type F connector thereto, together with a pair of extruded and stretched portions 122 provided on both sides of the portion extruded ratchet 121, serve to retain a circuit board. A protruding portion 123 (approximately 0.8 mm f) provided in the center of the extruded ratchet portion 121 serves to suppress the flow of the weld. A stamped line 124 provided on the upper side of the extruded ratchet portion 121 is a line stamped by a mold having a clearance of substantially zero. In addition, a pair of stamped portions 125 and 126 are provided in the left and right end portions of the shorter side 111 of the chassis to be respectively coupled with a pair of engageable protruding portions 127 and 128 of the longer sides 113 and 114 of the chassis respectively, during assembly of the tuner structure and to form a structure of the rectangular parallelepiped tuner by twisting. On the other hand, the other shorter side 112 of the chassis includes: two extruded ratchet portions 129; two extruded and stretched portions 130; and two pairs of stamped portions 131 and 132. All of these portions function in the same manner as the counterparts on the shorter side 111 of the chassis.
Next, the longest side 114 of the chassis will be described. The longer side 114 of the chassis not only becomes part of the shielding box, but also retains the circuit board because the longer side 114 of the chassis is provided with extruded ratchet portions and extruded and stretched portions to retain the circuit board. As shown in FIG. 12, the stamped portions 133, an extruded ratchet portion 134 and a pair of extruded and stretched portions 135, which are provided on both sides of the extruded ratchet portion 134, serve to retain the decking board. circuits. A protruding portion 136 (approximately 0.8 mm f) provided in the center of the extruded ratchet portion 134 serves to suppress the flow of the weld. A stamped line 137 on the upper side of the extruded ratchet portion 134 is a line stamped by a mold having a separation of substantially zero. The function of the longer side 114 of the chassis for retaining the circuit board will be described in detail later with reference to Figures 13A to 13C. Next, the plane 115 of the central angle of the chassis will be described. Plane 115 of the central chassis angle includes: nine holes for inserting through capacitors; three partition plates disposed parallel to the shorter sides 111 and 112 of the chassis; and a partition plate arranged vertically to the shorter sides 111 and 112 of the chassis. These portions will be described in detail with reference to Figures 11A to 11 D, 15, 16A and 16B and 17A and 17B.
Figures 10A to 10C and 11A to 11 D show a rectangular parallelepiped tuner structure of the present invention, formed by subjecting the single metal plate 110 for a chassis box shown in Figure 12 to stamping, drawing, drawing out , doubling and the like. Figures 11A to 11D show the chassis angle of the tuner structure of the present invention. Figure 11A is a side view of the shorter side 111 of the chassis; Figure 11B is a plan view of the folded angle of the chassis; Figure 11C is a side view of the longer side 113 of the chassis; and Figure 11D is a side view of the shorter side 112 of the chassis. In Figures 11A to 11 D, an input connector type F (or a contact branch F) has not yet been mounted to the chassis angle. On the other hand, figures 10A to 10C show the external appearance of the structure of the tuner of the present invention, to which the type F connector and the shielding covers have already been joined: Figure 10A is a plan view of the structure of the tuner; Figure 10D is a side view of a longer side thereof; and Figure 10C is a side view of a shorter side thereof. As described above, because a single metal plate 110 for a chassis box is divided into five regions, that is, the two sides 111 and 112 plus chassis cutter, the two longer sides 113 and 114 of the chassis and the central plane 115 of the chassis angle, as shown in figure 12, the respective sides 111 to 114 are mechanically coupled to the plane 115 of the angle of the central chassis. As a result, a tuner structure having high productivity and high mechanical precision can be obtained. As shown in Figure 11 A illustrating the shorter side 111 of the chassis, the reference number 116 denotes a hole to which the input connector (a type F connector or a contact branch F) and 117 and 118 is inserted. denote the extruded and extruded portions which have been ejected and stretched to project downward from the plane of the shorter side of the chassis (i.e., to project vertically and downwardly from the sheet of paper). The reference number 119 denotes a pair of outwardly stretched portions which are provided above and below the outer circumference of the hole 116 to insert the type F connector thereto and have been bent to project vertically and downwardly from the sheet of paper and undergoing a stretch on the flange portions 119A thereof. The reference number 120 denotes the stamped portions; 121 denotes an extruded ratchet portion; and 122 denotes the extruded and stretched portions which have been ejected and stretched to project downward from the plane of the shorter side 111 of the chassis (this is to project vertically and downwardly from the sheet of paper). The reference numeral 123 denotes a protruding portion provided in the center of the extruded ratchet portion 121; 124 denotes a line stamped by a mold having a separation of substantially zero; and 125 and 126 denote the stamped portions to be respectively coupled with engagable protruding portions 127 and 128 of the longer sides 113 and 114 of the chassis, respectively, to form a rectangular parallelepiped tuner structure by twisting or braiding. The reference numerals 138 and 139 denote protruding portions for securing and securing the upper and lower armor covers, respectively, and have been ejected and stretched to project upwardly from the plane of the shorter side 111 of the chassis (i.e., to project vertically and up the sheet of paper). Figure 11B is a plan view showing the plane 115 of the angle of the central chassis of the mounted chassis angle. The four outer sides of the tuner structure of the tenth example are formed by the two shorter sides 111 and 112 of the chassis and the two longer sides 113 and 114 of the chassis. Also provided are three partition plates 140, 141 and 142 arranged in parallel to the shorter sides 111 and 112 of the chassis, a single partition plate 143 disposed vertically to the sides 111 and 112, a bridge portion 144 having an effect of shielding and nine holes 145 to insert the capacitors through them. The reference number 1 19 denotes the outwardly stretched portions which are provided above and below the outer circumference of the hole 116 to insert the type F connector thereto and subjected to a stretching on the flange portions 119a thereof. . The portions 127 and 128 on the shorter side 111 of the chassis are the projecting portions to form a rectangular parallelepiped tuner structure by twisting (the portions 127 and 128 on the other shorter side 112 of the chassis have the same function).
In Figure 11C the longest side 114 of the chassis is shown, the reference number 133 denotes the stamped portions; 134 denotes the extruded ratchet portions; and 135 denotes the extruded and stretched portions which have been extruded and stretched to project downward from the plane of the longer side 114 of the chassis (i.e., to project vertically and downwardly from the sheet of paper). The reference numeral 136 denotes a protruding portion provided in the center of the extruded ratchet portion 134; 137 denotes a line stamped by a mold having a separation of substantially zero; and 128 denotes engagable protruding portions to form a rectangular parallelepiped tuner structure by braiding or twisting. The reference numerals 146 and 147 denote protruding portions for securing and securing the upper and lower armor covers respectively and have been ejected and stretched to project upwardly from the plane of the longer side 114 of the chassis (i.e., to project vertically and towards above the sheet of paper). The shorter side 112 of the chassis shown in the side view of Figure 11D is substantially the same as the shorter side 111 of the chassis shown in the side view of Figure 11 A, except for the portion to which the inlet connector it is mounted. In Figure 11D, two extruded ratchet portions 129, two extruded and stretched portions 130 and two pairs of stamped portions 130 and two pairs of stamped portions 131 and 132 function in the same manner as the counterparts on the shorter side 111 of the chassis. The reference numerals 148 and 149 denote the protruding portions for securing and securing the upper and lower armor covers respectively and have been ejected and stretched to project upwardly from the plane of the shorter side 112 of the chassis (i.e. to protrude vertically and up of the sheet of paper). Figures 10A to 10C show the external appearance of the structure of the tuner in the tenth example of the present invention, to which the type F connector and the shield covers have been joined: Figure 10A is a plan view of the structure of the tuner; Figure 10B is a side view of a longer side thereof; and Figure 10C is a side view of a shorter side thereof. In the plan view of Figure 10A, the reference number 119 denotes the outwardly stretched portions provided above and below the outer circumference of the hole 116 for inserting the type F connector thereto; 150 denotes a type F connector (or a contact branch F); 151 denotes a top shield cover; and 152 denotes a slotted portion of the shield cover 151. As shown in Fig. 10A, the slotted portion 152 has been formed in such a form to contact the outwardly stretched portion 119, to thereby perform a tuner structure having an external shape with a reduced thickness less than the height of the shorter side of the chassis which includes the outwardly projecting portions 119. The mechanical strength of the tuner structure is increased by the outwardly stretched portions 119 and the extruded and stretched portions 117 and 118, while the thickness of the tuner structure is reduced by employing the slotted portion 152 for the cover 151 of armor. That is, the structure of the tuner of the present invention has successfully satisfied these contradictory requirements. The shield cover 151 is secured to the chassis angle via the protruding portions or fastening structures 138, 139, 146, 147, 148 and 149 of the shorter sides of the chassis 111 and 112 and the longer sides of the chassis 113 and 114 as described with reference to Figures 11A to 11 D: Next, in the side view of the longer side shown in Figure 10B, reference number 119 denotes the stretched out portions.; 150 denotes a type F connector (or a contact branch F) 151 denotes a top shield cover; 152 denotes a slotted portion of the shield cover 151; 153 denotes a lower shield cover; 154 denotes a slotted portion of the shield cover 153; 155 denotes the legs for mounting the tuner structure; and 156 denotes the terminal bars of the through capacitors. Although not shown in Figure 10B, the shape of the slotted portion 154 of the lower shield cover 153 is the same as that of the slotted portion 152 of the top shield cover 151 as described with reference to Figure 10A. The slotted portion 154 of the lower shield cover 153 has been formed in such a configuration as not to be in contact with the outwardly stretched portion 119, thereby performing a tuner structure having an external shape with a reduced diameter smaller than the height of the longest side of the chassis including the projecting portions 119 projecting outwards.
Next, in the side view of the shorter side shown in Fig. 10C, the reference numerals 117 and 118 denote the extruded and stretched portions; 119 denotes the stretched out portions; 150 denotes a type F connector (or a contact branch F); 127 and 128 denote the attachable protruding portions which have been braided; 151 denotes a top shield cover; 153 denotes a lower shield cover; 155 denotes the legs for mounting the tuner structure; and 156 denotes the terminal bars of the through capacitors. The ejected and stretched portions 117 and 118 have been ejected and stretched to protrude downward from the plane of the shorter side 111 of the chassis (i.e., to project vertically and downwardly from the sheet of paper). Also, these extruded and stretched portions 117 and 118 are formed substantially as arcs parallel to the circumference of the circular hole 116 for inserting the type F connector, thereby increasing the mechanical strength thereof. In addition, the extruded and stretched circular portion 117 is formed in a p-configuration from which two corners protrude, thereby increasing the mechanical strength thereof. In Figure 10C, assuming that the diameter of the surface of the F-type connector (input connector or contact branch F) to be contacted with the chassis angle is denoted by A and the thickness of the chassis angle is denoted by B, A is equal to approximately 11.0 mm (standard value) and B equals approximately 9.2 mm (ie, A> B) in the structure of the tuner of the present invention for a cable modem. In general, the thickness B of a chassis angle is in the range of about 8.8 mm to about 9.6 mm. In this case, the thickness of a single flat layer of metal to form the structure of the tuner is approximately 0.6 mm. On the other hand, the external diameter of the threaded portion of a type F connector is approximately 9.3 mm f. According to the present invention, the chassis angle thickness of the tuner structure can be as small as about 9.2 mm f, which is smaller than the external diameter of the threaded portion of the F-type connector. As a result, a exemplary tuner structure of the present invention for a cable modem becomes in a tuner structure of a horizontal mounting type having an external size of approximately 11.5 mm (height) x approximately 70.2 mm (in length) x approximately 32.2 mm (wide) except for the protruding portion of type F connector (approximately 14.5 mm). The height of the tuner structure is approximately 11.5 mm, which is greater than the approximately 11.0 mm diameter of the surface of the type F connector that is to be brought into contact with the chassis angle by approximately 0.5 mm due to such factors such as the thickness of the flat metal plate and the prominence of the shielding covers.
Next, it will be described how the circuit board is mounted on the structure of the tuner. Figures 13A to 13C illustrate how the circuit board is mounted on the longer side 114 or 113 of the chassis: Figure 13A is a plan view seen from the longer side 113 of the chassis; Figure 13B is a cross-sectional view thereof; and Figure 13C is a plan view thereof. In Figure 13A the circuit board on which various electronic circuit components such as flake type capacitors, flake resistors, semiconductor devices, diodes, ICs, coils and through capacitors have been mounted are represented by shading. The stamped portions 133, the extruded ratchet portion 134 and the pair of extruded and stretched portions 135, which are provided on both sides of the extruded ratchet portion 134, serve to retain the circuit board 157. The protruding portion 136 provided in the center of the extruded ratchet portion 134 serves to suppress the flow of the weld. The printed line 137 on the upper side of the extruded ratchet portion 134 is a line stamped by a mold having a substantially zero separation. A bridge portion 158 on the stamped line 137 of the longest side 114 of the chassis works to increase the mechanical strength of the tuner structure. The reference numeral 146 denotes the protruding portions for securing and securing the upper shield cover 151. The patterned portions 133 have a width of about 1 mm and function to apply some resilience to the extruded ratchet portion 134 (which has a width of about 2 mm), to thereby retain in a flexible way the circuit board 157. In FIG. 13B, the extruded ratchet portion 134 and the protruding portion 136 (approximately 0.8 mm f) provided in the center of the extruded ratchet portion 134 operate for separating a batch of fillets from weld 159 reflowed from the surface of circuit board 157. Reference number 114 denotes a longer side of the chassis; 135 denotes an extruded and stretched portion; 137 denotes a stamped line; and 158 denotes a bridge portion. The circuit board 157 is not in contact with the longer side 114 of the chassis, but is retained via a certain space 160. The space functions as a damper to prevent the circuit board 157 from being directly affected by some knock or distortion due to thermal or mechanical factors. In Figure 13C, the reference number 114 denotes a longer side of the chassis; 134 denotes an extruded ratchet portion; 157 denotes a circuit board; and 160 denotes a space between the longer side 114 of the chassis and the circuit board 157. Figures 14A to 14C illustrate a structure for mounting a type F connector and caulking: Figure 14A is a cross-sectional view shows a structure for mounting a type F connector; the figure; 14B is a cross-sectional view illustrating the caulking of the type F connector; and Figure 14C is an enlarged partial view of Figure 14B.
Figure 14A is a cross-sectional view illustrating a structure for mounting a type F connector. In Figure 14A, the reference number 111 denotes a shorter side of the chassis; 119 denotes the stretched out portions; 150 denotes a type F connector; 157 denotes a circuit board; 161 denotes a central terminal of connector 150 type F; 162 denotes a dielectric insulator surrounding the central terminal 161 of the F-type connector 150. An electrical signal is input / output through the central terminal 161 connected to the circuit board 157. Figure 14B is a vertical cross-sectional view illustrating the caulking of the type F connector as seen from the reverse side of the type F connector 150. In FIG. 14B, the reference number 119 denotes the outwardly stretched portions; 157 denotes a circuit board; 161 denotes a central terminal of connector 150 type F; 162 denotes a dielectric insulator surrounding the central terminal 161 of the F-type connector 150; 163 denotes a caulking annulus for the 150 type F connector (or the cover of the 150 type F connector); 164 denotes the caulked portions; and 165 denotes a portion divided between the two caulked portions 164. Figure 14C is a partial enlarged view of Figure 14B. In Figure 14C, the reference number 157 denotes a circuit board; 161 denotes a central terminal of connector 150 type F; 162 denotes a dielectric insulator surrounding the central terminal 161 of the F-type connector 150; 163 denotes a caulking annulus for the 150 type F connector; 164 denote the caulked portions; and 165 denotes a portion divided between the two caulked portions 164. The caulking annulus 163 is generally coated with nickel and thus has poor wettability with welding. However, since the original material or bronze is exposed on the surface of the caulked portions 164, the surface has a satisfactory wettability with the weld, when the assembly is submerged in the weld, the divided portion 165 between the caulked portions 164 operates as a gate for absorbing the weld and as a channel for supplying a sufficient amount of weld absorbed to the caulked portions 164. In a conventional caulking method, the four corners of a caulking ring are caulked. However, according to the present invention, the portions 164 are caulked along the circumference of the caulking annulus 163. Since the divided portion 165 also works advantageously, the resistance to rotation of the caulked portions 164 can be improved up to three times or more (approximately 30 kg.cm) from that obtained by a conventional method. Figure 15 is a side cross-sectional view to illustrate a structure for mounting a through capacitor, in which the through capacitor 158 has been inserted into a hole 145 for inserting a through capacitor. The hole 145 is provided through the central plane 115 of the chassis angle. In Figure 15, the reference number 157 denotes a circuit board; 166 denotes a capacitor; 167 denotes a chip component; 168 denotes a coil component; 153 denotes a lower shield cover; and 156 denotes a terminal rod of the through capacitor 158. As shown in FIG. 15, this structure is formed in such a way that the through capacitor 158 is mounted from the inside of the chassis angle (or the plane 115 of the central chassis angle. ). Although a through capacitor is mounted from the outside of a chassis angle in a conventional method, the through capacitor is inserted from the inside of the chassis angle according to the present invention. By employing this mounting structure, when the solder is flowed again, the solder flux, cream solder or the like does not flow out, thereby preventing a case where a shield cover does not come into contact satisfactory with a chassis angle. The circuit board 157 on which various components and wires have been mounted is inserted into the chassis angle and then coupled with the extruded portions 134 (not shown in Figure 15) to form a assembly or assembly. After that, a process of immersion in secondary welding is carried out, to complete by this a tuner structure. If the through capacitor 158 is mounted from the opposite direction, that is, from the outside of the chassis angle, then the solder flux expands on the contact surface 114a between the annulus 158a of the through capacitor 158 and the angle of the chassis. As a result, in some cases, the weld does not sufficiently reach the interface of the contact surface 114a between the annulus 158a of the through capacitor 158 and the angle of the chassis. Figures 16A and 16B are side views illustrating various forms of the partition plates to be arranged on the center plane 115 of the chassis angle during assembly of the tuner structure as described with reference to the plan view of the figure 11 B: Figure 16A are side views showing only the shapes of the partition plates; and Figure 16B are side views illustrating the positional relationships between the circuit board 157 and the partition boards in various ways. In Figure 16A, the reference numerals 140, 141 and 142 denote partition plates in various ways. A partition plate of an appropriate shape is selected according to the required degree of electrical shielding and electrical wiring. In the tenth example described with reference to Fig. 10A to Fig. 16B, the five regions, i.e. the two shorter sides 111 and 112 of the chassis, the two longer sides 113 and 114 of the chassis and the central plane 115 of the Chassis angle are formed from a single metal plate 110 for a chassis box shown in Figure 12. However, those regions are not necessarily formed from a single metal plate for a chassis box. For example, it is naturally possible to use three plates as the pair of shorter sides 111 and 112 of the chassis, the pair of longer sides 113 and 114 of the chassis and the central plane 115 of the chassis angle, respectively, in order to form a structure of the tuner.
Example 11 Next, the eleventh example of the present invention will be described. The eleventh example describes an implementation of the tuner structure of the tenth example as a cable modem tuner. Figures 17A and 17B illustrate an exemplary cable modem tuner in the eleventh example of the present invention: Figure 17A is a block diagram showing the electrical circuit components formed in the cable modem tuner; and Figure 17B is a plan view showing the arrangement of the respective electrical circuit components shown in Figure 17A in a tuner structure. In the block diagram of the electric circuit of FIGS. 17A, a CATV (cable television) input signal is received at an input terminal (or a type F connector) 170, passed through a through filter bandpass (HPF) or an intermediate frequency filter (IF) 171 to eliminate an upstream signal from 5 to 46 MHz and then it is supplied to the switching circuits of the input signal 172, 173 and 174. The tuner cable modem includes sections of the receiver circuit corresponding respectively to the three divided bands of a UHF band (band B3) to receive a signal of 470 to 860 MHz, a high band of VHF (band B2) to receive a signal of 170 to 470 MHz and a low band of VHF (band B1) to receive a signal from 54 to 170 MHz. Switching circuits 172, 173 and 174 of the input signal are used for band B1, band B2 and band B3 respectively. The CATV signal is divided into the signal components corresponding to these three bands, which are tuned to the desired signals by the input tuner circuits 175, 176 and 177 of the radiofrequency amplifier respectively. The tuned signals are amplified by the radiofrequency amplifiers 178, 179 and 180 respectively. The amplified output signals are tuned by circuits 181, 182 and 183 of the output tuner of the radio frequency amplifier, respectively, and then converted to intermediate frequency (IF) signals by local oscillator circuits (local parallel type oscillator circuits) 185 , 187 and 189 and the mixing circuits 184, 186 and 188 respectively. The IF signals are then supplied to an IF amplifier circuit 190, passed through a SAW filter circuit 191 and an IF filter circuit 192 and then output to an output terminal 193. The reference number 194 denotes an AGC terminal. On the other hand, a data signal, which has been input through a data terminal 195, is passed through a circuit 196 upstream to be connected to the terminal 170 of the input of the CATV signal. In the plan view of Fig. 17B, showing the arrangement of the respective respective electrical circuit components shown in Fig. 17A in a tuner structure, the input connector 150 functions as the input terminal 170 of the CATV signal , the high pass filter 171 and the upstream circuit 196 are provided between the partition plate 140 and the shorter side 111 of the chassis and one of the through capacitors is assigned to the data terminal 195.
The switching circuits 172, 173 and 174 of the input signal and circuits 175, 176 and 177 of the input tuner of the radio frequency amplifier are provided between the partition plates 140 and 141 and another through capacitor is assigned to the AGC terminal. 194. The radio frequency amplifiers 178, 179 and 180 are provided between the partition plate 141 and the bridge 144 and the circuits 181, 182 and 183 of the output tuner of the radio frequency amplifier are provided between the bridge 144 and the plate 142 of the radio frequency amplifier. partition Another through capacitor is assigned to a power terminal 197. Mixing circuits 184, 186 and 188 and local oscillator circuits 185, 187 and 189 are provided in the region surrounded by the partition plates 142 and 143, the shorter side 112 of the chassis and the longer side 113 of the chassis. The IF amplifier circuit 190, the SAW filter circuit 191 and the IF filter circuit 192 is provided in the region surrounded by the partition plates 142 and 143, the shorter side 112 of the chassis and the longer side 114 of the chassis. Another through capacitor is assigned to the output terminal 193. By providing the appropriate partition plates 140, 141, 142 and 143 as described with reference to Fig. 16A and 16B, in designing and arranging the respective circuit components as shown in Fig. 17B and using the tuner structure of the present invention, various electrical characteristics can be improved with respect to a spurious (or false) level at the input terminal, the addition of a duplexer circuit and measures against an incoming alteration signal. These effects will be described in detail below. 1) Spurious level in the entry terminal. In comparison with a conventional example, the spurious level in the input terminal 170 can be improved by 10 to 20 dB according to the present invention. This effect can be confirmed by specific spurious level values of -35 dBmV or less in the VHF band and
-30 dBmV or less in the UHF band. 2) Addition of a duplexer circuit. Since a +50 dBmV to +60 dBmV signal is applied to the data terminal 195, it is likely that an induction coupling to the 175 to 177 circuits of the radio frequency amplifier input tuner is caused inside the modem tuner. of cable. However, according to the present invention, a shield plate or partition plate 140 (see Figure 16A and Figure 17B) is interposed between data terminal 195 and circuits 175 to 177 of the input tuner of the radio frequency amplifier. , to solve this problem through this. 3) Incoming noise (measures against incoming disturbance signals) According to the present invention, since the through capacitors are used as the power terminal 197, the data terminal 195, the AGC terminal 194 (PLL control) and the output terminal 193, various incoming radio frequency noises to the respective terminals such as a feed noise SW and the digital noise can be reduced. 4) Improvement of the shielding effects of a cable modem tuner. A cable modem tuner is connected to a cable line like a CATV device. In this case, it is necessary to prevent other devices (such as a higher converter) from being altered by the spurious signals of the tuner. Thus, compared to a conventional TV tuner, the spurious level at the tuner input terminal of the cable modem must be improved. As described above, in the tuner structure of the present invention, such spurious alteration can be successfully prevented. In addition, although a cable modem tuner to which a duplexer circuit has been integrated can transmit and receive data bi-directionally, a conventional TV tuner does not have the function of mixing an upstream signal and thus a duplexer circuit must additionally be provided for the same. When such a circuit is added, the filter thereof must be shielded. However, since the structure of the tuner of the present invention has a shielding effect as described above, a duplexer circuit has to be additionally provided for it. In addition, since a cable modem tuner is a peripheral component of a personal computer, the tuner is arranged in the vicinity of the personal computer in most cases. Since the cable modem is frequently exposed to digital noise generated from the personal computer, it is necessary to take some measures against the incoming disturbance signals. In the structure of the tuner of the present invention, sufficient measures have been taken against such an incoming alteration signal as described above. As is evident from the above description, the tuner structure of the present invention includes: a circuit board on which electronic circuit components such as transistors and resistors have been mounted; a chassis angle; and a shield cover. In the tuner structure, a through capacitor for introducing / emitting a power, control and the like signal is mounted to a metal plate arranged in parallel to the circuit board. As a result, the total height of the tuner structure can be reduced. Further, since the through capacitor leg is disposed between the legs of the chassis angle, the area occupied by the tuner structure on the surface of the main substrate can be reduced. In addition, by using the structure of the tuner of the present invention, a through capacitor, which has been conventionally difficult to incorporate into a tuner structure in view of reducing the thickness of the tuner structure, can now be incorporated into the structure of the tuner. Since the through capacitor has excellent noise elimination capability, the structure of the tuner becomes applicable to an extensive board of a personal computer or the like, which exists in an environment that has an extremely high noise level. In one embodiment of the tuner structure according to the present invention, the metal plate to which the through capacitor is mounted has been subjected to mechanical processing, thereby further reducing the total height of the tuner structure and increasing the mechanical strength of it. In another embodiment of the tuner structure according to the present invention, the through capacitor is mounted to a metal grounding plate provided separately from the angle of the chassis, such that the positions and the number of the legs of the Metal grounding plate to be inserted to the circuit board can be set arbitrarily. In addition, the grounding effects of the through capacitor and the circuit board can be improved compared to a conventional tuner structure. In still another embodiment of the tuner structure according to the present invention, the metal grounding plate has a box shape, to thereby improve the shielding effects. Furthermore, if an oscillating coil is inserted into the metal ground plate, in the form of a box, for example, then it is possible to prevent it from interfering with other circuits mounted on the circuit board (for example, power amplifier circuits). RF) through the radiation waves generated by the oscillating coil.
In still another embodiment of the tuner structure according to the present invention, the chassis angle is formed by mounting a metal plate to which an inlet connector is mounted to another folded metal plate. As a result, the material and the thickness of the chassis angle can be selected arbitrarily, arbitrary drawing can be carried out at a desired folding size, the input connector can be mounted to an arbitrary position of the metal plate, the Design flexibility can be improved and an optimal metal plate can be used as the metal plate for mounting the input connector to it. Consequently, a tuner structure with reduced thickness can be obtained at a lower cost. In yet another embodiment of the tuner structure according to the present invention, the metal plate to which the input connector is mounted has a portion with an increased width, such that a metal plate having a wider width small that the diameter of the input connector on the surface to be contacted with the side of the chassis angle (except for the portion having an increased width) can be used for mounting the input connector thereto. Consequently, a tuner structure with reduced thickness can be obtained at a lower cost. In yet another embodiment of the tuner structure according to the present invention, the metal plate to which the input connector is mounted has a plurality of small holes.
Consequently, the accuracy of the external size of the chassis angle does not deteriorate, since the weld is not collected on the metal plate when the angle of the chassis is submerged in the weld. The structure of the tuner according to another aspect of the present invention includes: a circuit board on which electronic circuit components such as transistors and resistors have been mounted; a chassis angle; and a shield cover. In the structure of the tuner, a terminal manifold for introducing / emitting a power, control and the like signal is mounted to a metal plate arranged in parallel to the circuit board. As a result, the total height of the tuner structure can be reduced. Further, since the legs of the terminal manifold are arranged between the legs of the chassis angle, the area occupied by the tuner structure on the surface of the main substrate can be reduced. The structure of the tuner according to still another aspect of the present invention includes a circuit board on which electronic circuit components such as transistors, resistors and through capacitors have been mounted; a chassis angle that includes a pair of shorter sides of the chassis, a pair of longer sides of the chassis and a center plane of the chassis angle; a shield cover; and an input connector. The structure of the tuner is characterized in that, when an outer diameter of a surface of the input connector is to be brought into contact with one of the pair of shorter sides of the frame angle of the chassis and a thickness of the chassis angle are denoted by A and B, respectively, an A > B. Thus, a tuner structure can be obtained in which the thickness of the chassis angle is smaller than the external diameter of the type F connector to be brought into contact with the shorter side of the chassis angle of the chassis and the Chassis angle has a great resistance (approximately 20 Kg.cm or more). In one embodiment of the tuner structure of the present invention, one of the sides of the pair of shorter sides of the chassis, of the angle of the chassis, to which the inlet connector is mounted, is provided with extruded and stretched portions and portions thereof. stretched out around an outer circumference of a hole to insert the inlet connector thereto. As a result, a tuner structure of a horizontal mounting type having an external size of about 11.5 mm (height) x about 70.2 mm (length) x about 32.2 mm (width) can be obtained. In another embodiment of the tuner structure of the present invention, each side of the pair of longer sides of the chassis angle chassis is provided with extruded and stretched portions and extruded ratchet portions, thereby forming a structure for retain the circuit board. In the structure, the circuit board is not directly in contact with the longer side of the chassis, but retained via a certain space between them. Thus, a tuner structure can be obtained in which it is possible to prevent the circuit board from being directly affected by some shock or distortion due to thermal or mechanical factors. In yet another embodiment of the tuner structure of the present invention, a structure for mounting the through capacitors on the circuit board from an internal side of the chassis angle is additionally provided. As a result, when the solder is reflowed, the solder flux, cream solder or the like does not flow outward, thereby preventing a case where the shield cover does not come into satisfactory contact with a chassis angle. In still another embodiment of the tuner structure of the present invention, a slotted portion is provided for the shield cover to contact one of the stretched portions outwardly of the shorter side of the chassis angle frame to which the input connector is mounted. As a result, a tuner structure of smaller size with a reduced thickness can be obtained. In yet another embodiment of the tuner structure of the present invention, the pair of shorter sides of the chassis, the pair of longer sides of the chassis and the central plane of the chassis angle are formed by the processing of a single flat metal plate. . As a result, a tuner structure can be obtained in which the respective sides are mechanically coupled to the central plane of the chassis angle and which has high productivity and high mechanical precision.
Further, by using the tuner structure of the present invention, a tuner structure of smaller size is made having an external size of approximately 11.5 mm (height) x approximately 70.2 mm (in length) x approximately 32.2 mm (in length). width), the resistance to the rotation thereof can be increased up to 20 Kg.cm to 30 Kg.cm or more and a tensile strength of 10 Kg. or more is realized. According to still another aspect of the present invention, a cable modem tuner including the tuner structure of the present invention is provided. The cable modem tuner of the present invention includes a tuner structure comprising: a circuit board on which electronic circuit components such as transistors, resistors and through capacitors have been mounted; a chassis angle that includes a pair of shorter sides of the chassis, a pair of longer sides of the chassis and a center plane of the chassis angle; a shield cover; and an inlet connector, an external diameter A of a surface of the input connector to be contacted with one of the sides of the pair of shorter sides of the chassis that is greater than a thickness B of the chassis angle. The cable modem tuner of the present invention further includes: radio frequency amplifier input tuner circuits corresponding to respectively different frequency bands; radio frequency amplifiers; output tuner circuits of the radio frequency amplifier; frequency converter circuits; local oscillator circuits; an intermediate frequency amplifier circuit; a SAW filter circuit; an intermediate frequency amplifier circuit as a post-stage amplifier circuit; and PLL selector circuits. The electrical characteristics of the cable modem tuner can be sufficiently improved with respect to a spurious (or false) level at the input terminal, the addition of a duplexer circuit and the measures against an incoming disturbance signal. Various other modifications will be apparent and can easily be realized by those skilled in the art without deviating from the scope and spirit of this invention. Therefore, it is not proposed that the scope of the claims appended hereto be limited to the description as summarized herein, but rather that the claims be broadly construed. It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following
Claims (15)
- Claims 1. A tuner structure characterized in that it comprises: a circuit board on which electronic circuit components such as transistors and resistors, a chassis angle, and a shield cover; wherein a through capacitor for introducing / emitting a power, control and the like signal is mounted to a metal plate disposed in parallel to the circuit board.
- 2. A tuner structure according to claim 1, characterized in that the metal plate to which the through capacitor is mounted has been subjected to mechanical processing.
- 3. A tuner structure according to claim 1, characterized in that the through capacitor is mounted to a metal ground plate provided separately from the angle of the chassis.
- 4. A tuner structure according to claim 3, characterized in that the metal grounding plate has a box shape.
- 5. A tuner structure according to claim 1, characterized in that the angle of the chassis is formed by mounting a metal plate to which an inlet connector is mounted to another folded metal plate.
- 6. A tuner structure according to claim 5, characterized in that the metal plate to which the input connector is mounted has a portion having an increased width.
- 7. A tuner structure according to claim 5, characterized in that the metal plate to which the input connector is mounted has a plurality of small holes.
- 8. A tuner structure characterized in that it comprises: a circuit board on which electronic circuit components such as transistors and resistors, a chassis angle, and a shield cover; wherein a terminal manifold for introducing / emitting a power, control and the like signal is mounted to a metal plate arranged in parallel to the circuit board.
- 9. A tuner structure characterized in that it comprises; a circuit board on which electronic circuit components such as transistors, resistors and through capacitors have been mounted; a chassis angle that includes a pair of shorter sides of the chassis, a pair of longer sides of the chassis and a central angle of the chassis angle; a shield cover; and an inlet connector, wherein, when the outer diameter of a surface of the input connector to be brought into contact with one of the sides of the pair of shorter sides of the chassis angle chassis and a thickness of the angle of the chassis are denoted by A and B, respectively, an A > B.
- 10. A tuner structure according to claim 9, characterized in that the pair of shorter sides of the frame chassis angle to which the input connector is mounted, is provided with extruded and stretched portions and portions stretched out around a circumference external of a hole, to insert the input connector to them.
- 11. A tuner structure according to claim 9, characterized in that each of the sides of the pair of longer sides of the chassis angle chassis is provided with extruded and extracted portions and extruded ratchet portions, thereby forming a mechanism for retain the circuit board.
- 12. A tuner structure according to claim 9, characterized in that it comprises a mechanism for mounting the passive capacitors on the circuit board from the inside of the chassis angle.
- 13. A tuner structure according to claim 9, characterized in that a slotted portion for the shield cover is provided, to contact one of the outwardly stretched portions of the shorter side of the chassis of the chassis angle to which it is mounted. the input connector.
- 14. A tuner structure according to claim 9, characterized in that the pair of shorter sides of the chassis, the pair of longer sides of the chassis and the central plane of the chassis angle are formed by the processing of a single metal flat plate.
- 15. A cable modem tuner characterized in that it comprises: a tuner structure comprising: a circuit board on which electronic circuit components such as transistors, resistors and through capacitors have been mounted; a chassis angle that includes a pair of shorter sides of the chassis, a pair of longer sides of the chassis and a center plane of the chassis angle; a shield plate; and an input connector; an outer diameter A of a surface of the input connector to be brought into contact with one of the sides of the pair of shorter sides of the chassis of the chassis angle is greater than the thickness B of the chassis angle, tuner circuits of radio frequency amplifier input, corresponding to respectively different frequency bands; radio frequency amplifiers; circuits of the output tuner of the radiofrequency amplifier; frequency converter circuits; local oscillator circuits; an intermediate frequency amplifier circuit; a SAW filter circuit; an intermediate frequency amplifier circuit as a post-stage amplifier circuit; and PLL selector circuits.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16909496A JPH1022674A (en) | 1996-06-28 | 1996-06-28 | Tuner structure |
| JP8-169094 | 1996-06-28 | ||
| JP9-018019 | 1997-01-31 | ||
| JP01801997A JP3411461B2 (en) | 1997-01-31 | 1997-01-31 | Tuner structure and tuner for cable modem using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| MX9704889A MX9704889A (en) | 1998-06-30 |
| MXPA97004889A true MXPA97004889A (en) | 1998-10-30 |
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