TWI586547B - Stencil assembly structure - Google Patents

Description

Template combination structure

The present invention relates to a template assembly structure, and more particularly to a template assembly structure for cloth tin on a printed circuit board.

Surface Mounted Technology (SMT) is a commonly used board assembly technology that enables miniaturization, high reliability, high density, low cost, and production automation of electronic product assembly. The SMT printed pattern is defined by the holes in the template (Stencil), and the solder paste (Solder Paste) is printed on the pads of the corresponding printed circuit board through the holes in the template, so the template is the SMT assembly process. The most important mold, and the template must provide a certain tension to avoid sticking the solder paste that has been printed on the pad to the template, resulting in the situation of de-soldering paste, resulting in poor printing quality.

1 is an exploded perspective view of a combined cloth tin structure of a conventional printed circuit board. As shown, the combined cloth tin structure 9 includes a fixed frame 91, a hollow rectangular stretch net 92, and a steel plate 93. 93 is a rectangular shape having a rectangular tin-sand area 931 and a fixing area 932 surrounding the four sides of the cloth tin area 931. The cloth tin area 931 has a plurality of through holes 9311 for disposing solder paste, and the fixing area 932 is used for Adhering to the inner edges of the four sides of the stretched net 92, the outer edges of the four sides of the stretched net 92 are tensioned outwardly by the same pulling force to level the steel plate 93, and then clamped and fixed to the four sides of the fixing frame 91. Clamping groove Within 911.

When the conventional assembled tin structure 9 is used, a printed circuit board (not shown) is horizontally fixed to a platform (not shown) of a machine table (not shown), and the conventional combined cloth tin structure 9 is The fixing frame 91 is fixed on the machine table, and the steel plate 93 of the conventional assembled cloth tin structure 9 is aligned on the printed circuit board, and then the solder paste is scraped through the cloth tin area 931 of the steel plate 93 so that The solder paste is disposed in the through hole 9311 of the steel plate 93 and attached to the printed circuit board, and finally the hand-assembled cloth tin structure 9 is removed, and the printed circuit board is provided with a plurality of spot solder pastes. And the printed circuit board can be further processed.

However, the conventional rectangular steel plate has the disadvantage that uneven tension distribution leads to poor printing effect, or the disadvantage that the tension is deteriorated after being used for a period of time, and cannot be disassembled so that a single fixed frame corresponds to various printed circuit boards. Therefore, it causes the disadvantages of complicated assembly and increased cost. Therefore, how to provide a template combination structure which can improve the lack of the prior art is an urgent problem to be solved by those skilled in the related art.

The purpose of the present invention is to provide a template assembly structure for soldering on a printed circuit board to simplify the assembly process, reduce the manufacturing cost, and ensure that the template provides sufficient tension and an average tension distribution by adjusting the template tension on average. Avoiding the removal of solder paste and resulting in poor print quality, thereby improving the lack of conventional techniques.

In order to achieve the above object, a broader aspect of the present invention provides a template assembly structure for fabricating a printed circuit board. The template assembly structure includes a template, a fixed frame, a deformable tube member, and a Gas device. The template has a plurality of first holes and a plurality of second holes, and the plurality of first holes define a tinplate And the fixing frame comprises a frame body and a plurality of fixing bases, wherein the plurality of fixing seats are arranged on the frame body in a manner of being independent and separated from each other and arranged in a circular shape, and each of the fixing seats is provided with a guide The plurality of second holes of the template are sleeved on the plurality of guiding rods of the plurality of fixing bases, so that the template is fixed on the plurality of fixing bases. The deformable tubular member is received at the bottom of the plurality of fixing seats, and the air supply device is in communication with the deformable tubular member and is configured to adjust the amount of gas in the deformable tubular member, thereby utilizing gas pressure on the deformable tubular member The resulting deformation drives a plurality of guide rods to achieve the purpose of adjusting the tension of the template.

According to the concept of the present case, the template is a circular template.

According to the concept of the present invention, the frame body has a rectangular carrier and an annular carrier, and the annular carrier is disposed on the inner side of the rectangular carrier. Moreover, the frame body has a plurality of ribs connected between the rectangular carrier and the annular carrier.

According to the concept of the present invention, the fixing frame further comprises an outer frame correspondingly disposed on the rectangular carrier.

According to the concept of the present invention, the plurality of fixed seats are correspondingly disposed on the annular carrier.

According to the concept of the present invention, the plurality of fixed seats are disposed separately at equal intervals from each other.

According to the concept of the present invention, each of the fixing seats has an opening for the guiding rod to be inserted therein, and the guiding rod protrudes from a top surface of the fixing seat.

According to the concept of the present invention, the fixing seat is substantially U-shaped and has a bottom recess, and the lower end of the guiding rod is received in the bottom recess.

According to the concept of the present invention, the deformable tubular member is placed in the bottom recess of the fixing seat in.

According to the concept of the present invention, the deformable tubular member is located away from one side of the center of the template with respect to the guide rod.

According to the concept of the present invention, when the air supply device inflates the deformable tube member, the deformable tube member expands and deforms and pushes against the lower end portion of the guide rod, so that the top of the guide rod is offset away from the center of the template. And pushing the template set on the guiding rod to achieve the purpose of adjusting the tension of the template.

According to the concept of the present invention, the guiding rod is arranged on the fixing seat in a shaft connection manner, and the cymbal is oscillated and rotated relative to the fixing seat.

According to the concept of the present invention, the guiding rod includes a shaft portion that is disposed on the fixing seat and correspondingly disposed with two through holes, so that the guiding rod is rotatably oscillated relative to the fixing seat.

According to the concept of the present invention, the fixing frame further comprises a ring for fitting the template to the plurality of fixing seats.

2‧‧‧Template combination structure

21‧‧‧ template

211‧‧‧ first hole

212‧‧‧Second hole

22‧‧‧Fixed frame

221‧‧‧Frame Ontology

2211‧‧‧Rectangular plate

2212‧‧‧ring plate

2213‧‧‧ rib

2214‧‧‧Front frame

222‧‧‧ fixed seat

2221‧‧‧ openings

2222‧‧‧ top surface

2223‧‧‧ bottom notch

2224‧‧‧Perforation

223‧‧‧guides

2231‧‧‧ Rod Body

2232‧‧‧Axis

224‧‧‧ collar

23‧‧‧Deformable pipe fittings

24‧‧‧ gas supply

9‧‧‧Combined cloth tin structure

91‧‧‧Fixed frame

911‧‧‧Clamping slot

92‧‧‧Band net

93‧‧‧ steel plate

931‧‧‧Buxi District

9311‧‧‧through hole

932‧‧‧fixed area

Figure 1 is an exploded perspective view of a combined cloth tin structure of a conventional printed circuit board.

Figure 2 is a schematic view of the template assembly structure of the preferred embodiment of the present invention.

Figure 3 is an exploded view of the template assembly structure of the preferred embodiment of the present invention.

Figure 4A is a top plan view of the fixed frame of the preferred embodiment of the present invention.

Fig. 4B is an enlarged view of a partial structure of the fixed frame.

Figure 4C is an exploded view of the mount and the guide.

FIG. 5A is an enlarged partial view of the template assembly structure of the preferred embodiment of the present invention before being inflated (the template is removed to show the deformable tube).

Figure 5B is a cross-sectional view of the AA in Figure 5A (with template).

Figure 6A is an enlarged partial view of the template assembly structure of the preferred embodiment of the present invention after inflation (the template is removed to show the deformable tube).

Figure 6B is a cross-sectional view of the AA in Figure 6A (with template).

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and the description and illustration are in the nature of

Please refer to FIG. 2 and FIG. 3, wherein FIG. 2 is a schematic diagram of a template assembly structure of the preferred embodiment of the present invention, and FIG. 3 is an exploded view of the template assembly structure of the preferred embodiment of the present invention. As shown, the template assembly structure is used to bond tin on a printed circuit board. As shown in the figure, the template assembly structure 2 mainly includes a template 21 and a fixed frame 22, a deformable tube member 23 and a gas supply device 24. The template 21 has a plurality of first holes 211 and a plurality of second holes 212. The plurality of first holes 211 can be formed by laser cutting and define a tin pattern. The template 21 is preferably circular. A plurality of second holes 212 are disposed along the outer edge of the template 21 and arranged in a circular shape.

The fixed frame 22 mainly includes a frame body 221 and a plurality of fixing bases 222. The frame body 221 has a rectangular carrier plate 2211 and an annular carrier plate 2212. The annular carrier plate 2212 is disposed on the inner side of the rectangular carrier plate 2211, and is connected by a plurality of ribs 2213 therebetween. The frame body 221 further includes an outer frame 2214 correspondingly disposed on the rectangular carrier plate 2211, and the plurality of fixing bases 222 are arranged on the annular carrier plate 2212 and arranged in a circular shape, wherein the plurality of fixing bases 222 are They are disposed on the annular carrier 2212 in a manner that is independent and separate from each other, and are preferably separated from each other at equal intervals. Set (as shown in Figure 5A).

Each of the fixing bases 222 is provided with a guiding rod 223 protruding from the top surface 2222 of the fixing base 222 (as shown in FIG. 4B), and the plurality of second holes 212 of the template 21 are correspondingly sleeved in the plurality of fixing holes 222. The plurality of guiding rods 223 are fixed on the fixing base 222 to fix the template 21 to the fixing base 222.

In one embodiment, the template 21 is made of a metal material, such as a stainless steel plate, but is not limited thereto. In addition, the fixing base 222 and the guiding rod 223 are also made of a metal material, for example, aluminum, but not limited thereto.

According to the test, compared with the conventional rectangular template, there is a problem that the tension distribution is uneven. The circular template used in the present invention can provide an average tension distribution, so that the disadvantage that the printing effect is not good due to uneven tension distribution can be avoided.

Please refer to FIG. 4A to FIG. 4C , wherein FIG. 4A is a schematic diagram of a fixed frame of the preferred embodiment of the present invention, FIG. 4B is an enlarged view of a partial structure of the fixed frame, and FIG. 4C is an exploded view of the fixed seat and the guide rod; Figure. As shown in the figure, the fixing base 222 is disposed on the annular bearing plate 2212 and has an opening 2221 for the guiding rod 223 to pass through, and the top of the guiding rod 223 protrudes from the top surface 2222 of the fixing base 222, so that the template The second hole 212 is sleeved on the guiding rod 223 and attached to the top surface 2222 of the fixing seat 222.

In one embodiment, the mount 222 is generally U-shaped and has a bottom recess 2223, and the lower end of the guide rod 223 is received in the bottom recess 2223. When a plurality of mounts 222 are disposed in a circular arrangement on the annular carrier 2212, the bottom recesses 2223 are in communication to form an annular passage. In addition, the fixing base 222 can be fixed to the annular bearing plate 2212 by various means, for example, by being stuck, stuck, or locked by a locking component, but not limited thereto.

According to the concept of the present case, the guide rod 223 is movably disposed on the fixed seat 222. In an embodiment, the guide rods 223 are disposed on the fixing base 222 in a shafting manner. As shown in FIG. 4C, in addition to the rod-shaped body 2231, the guide rod 223 further includes a shaft portion 2232 which is perpendicular to the rod-shaped body 2231 and extends to opposite sides of the rod-shaped body 2231, and is fixed at the fixing seat 222. The two opposite sides of the opening 2221 have two through holes 2224 corresponding to the shaft portion 2232. When the guiding rod 223 is combined with the fixing base 222, the top of the rod-shaped main body 2231 is disposed through the opening 2221 of the fixing base 222 and protrudes from the top surface 2222 of the fixing base 222, and the shaft portion 2232 is disposed through the fixing base 222. The two through holes 2224 enable the guide rod 223 to swing and rotate relative to the fixed seat 222.

In one embodiment, the opening 2221 of the fixing base 222 has a substantially elliptical cross-sectional shape, and the long elliptical long axis extends in the radial direction of the annular carrier 2212, and the guiding rod 223 is also similar to the annular carrier 2212. The radial direction swings such that the top of the guide bar 223 can be offset towards or away from the center of the template 21.

In order to further ensure that the template 21 provides sufficient tension to avoid the deterioration of the printing quality caused by the removal of the solder paste, the template assembly structure 2 of the present invention is further provided with a tension adjustment mechanism, which is mainly composed of the deformable tube member 23 and the air supply device 24. Achieved (as shown in Figures 2 and 3), wherein the two ends of the deformable tubular member 23 are in communication with the gas supply device 24, and the gas supply device 24 adjusts the amount of gas in the deformable tubular member 23, thereby utilizing gas pressure The deformation generated by the deformable tube member 23 drives a plurality of guide rods 223 to achieve the purpose of adjusting the tension of the template 21. The tension adjustment mechanism of this case will be further explained below.

Please refer to FIG. 5A and FIG. 5B , wherein FIG. 5A is an enlarged partial view of the template assembly structure of the preferred embodiment of the present invention before being inflated (removing the template to display the deformable tube), and FIG. 5B is the 5A. AA cross-sectional view (with template) in the figure. As shown, the deformable tubular member 23 is a ring formed by the recess 2223 at the bottom of the plurality of mounts 222. In the shaped passage, and relative to the guide rod 223, the deformable tubular member 23 is located away from one side of the center of the template 21. When the air supply device 24 does not inflate the deformable tubular member 23, the deformable tubular member 23 does not push against the lower end portion of the guide rod 223, so that the top of the guide rod 223 is not displaced.

Please refer to FIGS. 6A and 6B, wherein FIG. 6A is an enlarged partial view of the template assembly structure of the preferred embodiment of the present invention after inflation (removing the template to display the deformable tube), and FIG. 6B is the 6A. AA cross-sectional view (with template) in the figure. As shown, when the air supply device 24 inflates the deformable tubular member 23, since the deformable tubular member 23 expands and deforms, it will push against the lower end portion of the guide rod 223, and the guide rod 223 is axially coupled to the shaft portion 2232. The fixing seat 222 is such that the lower end portion of the guiding rod 223 is pushed by the deformable tube member 23 and is displaced toward the center of the template 21, and the top of the guiding rod 223 is offset away from the center of the template 21, thereby pushing The template 21 sleeved on the guide bar 223 achieves the purpose of adjusting the tension of the template 21.

Of course, through different inflation amounts, the deformable tube member 23 can have different deformation amounts, so that the top of the guide rod 223 can be displaced away from or close to the center of the template 21, so that between the charge and discharge gas, the pair can be The template 21 has varying degrees of tension adjustment.

Therefore, according to the design of the present case, the user can adjust the tension of the template 21 by using the deformable tube member 23, especially after the template 21 is repeatedly used for a period of time, the tension is insufficient to be generated, so that the tension can be adjusted to ensure that the template 21 provides sufficient. The tension is prevented from taking off the solder paste and the printing quality is deteriorated.

Moreover, the template 21 of the present invention is a circular template, so that an average tension distribution can be provided, and in the tension adjustment, since the plurality of fixing seats 222 and the plurality of guiding rods 223 are also arranged in a circular shape, and a plurality of fixing bases 222 are Arranged in a mutually independent and separate manner such that the deformable tubular member 23 is independently and directly pushed against each of the guide rods when inflated. The 223 is offset away from the center of the template 21, and the deformable tube member 23 can independently adjust and drive each of the guide rods 223 to operate. Therefore, the tension can be adjusted evenly during the tension adjustment, and the template 21 can also be provided. Average tension distribution.

Moreover, the assembly method of the template 21 and the fixed frame 22 in the present invention is relatively simple and convenient, as long as the plurality of second holes 212 of the template 21 are aligned on the plurality of guide rods 223 on the plurality of fixing bases 222. Therefore, when the printing pattern of the template 21 is changed or has reached the end of use or damage, the template 21 can be simply replaced without disassembling the fixing frame and reassembling, thereby improving the assembly process and reducing the manufacturing cost.

In addition, the fixed frame 22 of the present invention further includes a set of rings 224 (as shown in FIGS. 3 and 5B), which corresponds to the size and shape of the template 21, and has a substantially L-shaped cross-sectional structure, and the template 21 can be The sleeve 21 is sleeved on the fixing base 222 of the frame body 221 to prevent the template 21 from being loosened from the fixing base 222. In an embodiment, the collar 224 is fixed to the fixing base 222 by a locking method, for example, by a locking component such as a screw, but is not limited thereto.

In summary, the template assembly structure for the cloth on the printed circuit board mainly comprises a template, a fixed frame, a deformable pipe member and a gas supply device, the template having a plurality of first holes and a plurality of a plurality of holes, the plurality of first holes defining a tin pattern, and the fixed frame comprises a frame body and a plurality of fixing seats, the plurality of fixing seats being disposed on the frame body independently and separately from each other And each of the fixing bases is provided with a guiding rod, and the plurality of second holes of the template are correspondingly sleeved on the plurality of guiding rods of the plurality of fixing seats, so that the template is fixed on the plurality of guiding rods Multiple fixed seats. The deformable tubular member is received at the bottom of the plurality of fixing seats, and the air supply device is in communication with the deformable tubular member and is configured to adjust the amount of gas in the deformable tubular member, thereby utilizing gas pressure on the deformable tubular member Place The resulting deformation drives a plurality of guide rods to achieve the purpose of adjusting the tension of the template. According to the design of the present case, the user can adjust the tension of the template by using the deformable tube member to ensure that the template provides sufficient tension to avoid the deterioration of the printing quality caused by the removal of the solder paste. Moreover, the assembly method of the template and the fixed frame in this case is quite simple and convenient, so that the assembly procedure is simplified and the manufacturing cost is reduced. On the other hand, the template of the present invention is preferably a circular template, which can provide an average tension distribution, avoids the disadvantage that the printing effect is poor due to uneven tension distribution, and since the deformable tube is independent and directly adjusts and drives each The root guide is actuated, so the average tension can be adjusted during tension adjustment. Since the above advantages are not in the prior art, the template combination structure used for the tin on the printed circuit board in this case is of great industrial value, and the application is made according to law.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

2‧‧‧Template combination structure

21‧‧‧ template

211‧‧‧ first hole

212‧‧‧Second hole

22‧‧‧Fixed frame

23‧‧‧Deformable pipe fittings

24‧‧‧ gas supply

Claims (14)

A template assembly structure for fabricating a tin on a printed circuit board, the template assembly structure comprising: a template having a plurality of first holes and a plurality of second holes, the plurality of first holes defining a cloth tin a fixed frame comprising a frame body and a plurality of fixing bases, the plurality of fixing bases are disposed on the frame body in a manner of being independent and separated from each other and arranged in a circular shape, and each of the fixing seats is provided with a guide a rod, the guide rod is disposed on the fixing seat in a shafting manner, and the cymbal is oscillatingly oscillated relative to the fixing seat, and the plurality of second holes of the template are correspondingly disposed on the plurality of the plurality of fixing seats a guide rod fixed to the plurality of fixing bases; a deformable tubular member disposed at a bottom of the plurality of fixing seats; and a gas supply device connected to the deformable tubular member and configured to be adjusted The amount of gas in the deformable tubular member, thereby utilizing the deformation of the deformable tubular member by the gas pressure to drive a plurality of guide rods to achieve the purpose of adjusting the tension of the template. The template assembly structure of claim 1, wherein the template is a circular template. The formwork assembly structure of claim 1, wherein the frame body has a rectangular support plate and an annular support plate, and the annular support plate is disposed on the inner side of the rectangular support plate. The stencil assembly structure of claim 3, wherein the frame body has a plurality of ribs connected between the rectangular gusset and the annular gusset. The template assembly structure of claim 3, wherein the fixing frame further comprises an outer frame correspondingly disposed on the rectangular carrier. The template assembly structure of claim 3, wherein the plurality of fixing seats are correspondingly disposed on the annular carrier. The template assembly structure of claim 1, wherein the plurality of fixed seats are disposed separately at equal intervals from each other. The template assembly structure of claim 1, wherein each of the fixing seats has an opening for the guiding rod to be inserted therein, and the guiding rod protrudes from a top surface of the fixing base. The template assembly structure of claim 1, wherein the fixing seat is substantially U-shaped and has a bottom recess, and the lower end of the guiding rod is received in the bottom recess. The stencil assembly of claim 9, wherein the deformable tubular member is received in the bottom recess of the mount. The template assembly structure of claim 1, wherein the deformable tubular member is located away from one side of the center of the template with respect to the guide rod. The template assembly structure of claim 1, wherein when the air supply device inflates the deformable tube member, the deformable tube member expands and deforms and pushes against a lower end portion of the guide rod, so that the guide rod is The top is offset away from the center of the template, and the template is placed on the guide rod to achieve the purpose of adjusting the tension of the template. The template assembly structure of claim 1, wherein the guide rod comprises a shaft portion that is disposed through the corresponding two through holes on the fixing seat, so that the guide rod is rotated and oscillated relative to the fixed seat. . The template assembly structure of claim 1, wherein the fixing frame further comprises a set of rings for fitting the template to the plurality of fixing bases.