JPH03120680A - tape cartridge - Google Patents

Abstract

PURPOSE:To reduce the influence of external vibration and to prevent the defor mation of an intermediate frame by constituting a mainbody case by means of upper/lower boards which mutually face in parallel and the prastic-made intermediate frame which is intervened and fixed in such a way that it covers the right and left-side and the rear-side of the boards and integrally forming reinforcement sibs at the corners of the intermediate frame. CONSTITUTION:The prastic-made intermediate frame 11 is intervened and fixed between the upper and lower boards 9 and 10 which face each other in such a way that it covers the right and left-side and the rear-side of the boards so as to constitute the mainbody case. Then, the reinforcement ribs 27 are integrally fitted to the corners of the inner periphery of the intermediate frame 11. The intermediate frame 11 generates deformation owing to the viscoelasticity of a prastic member and gives damping capacity by following vibration even if bending vibration is added by a tape deck and the like, and the strength of the intermediate frame 11 is improved by the reinforcement ribs 27, whereby deformation owing to external force is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a tape cartridge, and more specifically, to an improved structure of the main body case.

[Conventional technology]

As a tape cartridge, for example,
As shown in Publication No. 668, the main body case is made up of three constituent members: an upper plate and a lower plate having external shapes that meet the standard, and a tape storage space and a tape running system interposed between the upper and lower plates. There is one that consists of a middle frame and a middle frame.

The upper and lower plates are made of plastic, and the middle frame is made of metal, in order to particularly improve assembly accuracy.

However, since the tape guide member constituting the tape running system is integrally formed of metal in the inner frame, the running performance of the tape is impaired.

In order to improve this point, there is a device in which the tape guide member is integrally formed with upper and lower plastic plates, and the peripheral frame member of the main body case is made of metal (Japanese Patent Laid-Open No. 59-33679
Publication No.).

[Problem to be solved by the invention]

However, in the conventional main body case structure mentioned above, the middle frame or peripheral frame member is made of metal, so compared to a normal tape cartridge whose entire main body case is made of plastic material, it has a large mass and is Increased rigidity,
In this respect, the influence of external vibrations is small, which can be said to be advantageous in reducing modulation noise. However, since the upper and lower plates of the main body case are molded from plastic material, the rigidity of the upper and lower surfaces of the main case, especially near the center of each surface, is still low, making them susceptible to external vibrations. be.

In order to solve these problems, the same applicant previously constructed the upper and lower plates of the main body case from metal and the inner frame from plastic, and also constructed the tape guide block from plastic separately. (Patent Application No. 63-240537).

However, when the inner frame is molded from a plastic material in this way, it is easily deformed by external force. In particular, the middle frame is formed into a U-shaped frame so as to close the left and right sides and rear side of the main case, and the bosses provided at the four corners are integrally connected to the upper and lower plates with screws. Therefore, the walls between the bosses of this middle frame are vulnerable to external forces and easily deform.

Therefore, the present invention further develops and improves the tape cartridge whose main body case consists of upper and lower plates and a middle frame as described above, thereby reducing the influence of external vibrations and preventing deformation of the middle frame. The purpose is to

[Means to solve the problem]

In the tape cartridge of the present invention, for example, as shown in FIG. 1, a plastic inner frame 11 is interposed and fixed between the opposing upper and lower plates 9 and 10 so as to close the left and right sides and rear side. It is assumed that the inner periphery of the middle frame 11 is small (with reinforcing ribs 2 at the corners).
7 are added together.

It is preferable that the upper and lower plates 9 and 10 are made of metal.

[Effect]

By molding the middle frame 11 from a plastic material,
Even when bending vibration is applied by a tape deck or the like, vibration damping performance can be exhibited by causing the inner frame 11 to undergo shear deformation due to the viscoelasticity of the plastic material.

Even when the middle frame 11 is molded from a plastic material, reinforcing ribs 27 are integrally attached to the corners of the inner periphery, so that the strength is increased and deformation due to external force can be prevented.

- When the upper plate 9 and the lower plate 10 are made of metal, the mass of the entire tape cartridge can be increased, and the rigidity of the entire body case 1 including the center portions of the upper and lower surfaces can be further increased. can.

〔Effect of the invention〕

According to the tape cartridge of the present invention, the middle frame 1 is interposed and fixed between the upper and lower plates 9 and 10 constituting the main body case 1.
Since the frame 1 is made of plastic, even if bending vibration is applied from the outside, the vibration can be well absorbed and suppressed by the inner frame 11, thereby reducing modulation noise.

Furthermore, since the inner frame IT is provided with reinforcing ribs 27 to increase its strength, the rigidity of the main body case 1 can be increased.

In addition, by configuring the upper and lower plates 9 and 10 with metal, not only can the mass be increased, but the rigidity of the entire main body case l can be further increased, and the influence of external vibration can be further reduced, thereby reducing modulation noise. can be reduced and the sound quality can be improved.

〔Example〕

An embodiment of the tape cartridge according to the present invention will be described with reference to FIGS. 1 to 5.

In Fig. 2, the main body case 1 rotatably accommodates a pair of left and right hubs 3, 3 around which the tape 2 is wound. A head insertion opening 4 is provided, and an erasing head insertion opening 5 and a pinch roller insertion opening 6 are provided on the left and right sides of the head insertion opening 4, respectively.

Further, tape guide rollers 7, 7 are rotatably arranged on the front left and right sides of the inside of the main body case 1, and both guide rollers 7,
A plastic tape guide block 8 is disposed between the tape guide blocks 7 and 7.

The main body case 1 is composed of an upper plate 9 and a lower plate 10 made of metal that face each other vertically in parallel, and a middle frame 11 made of plastic interposed and fixed between the upper and lower plates 9 and 10.

In FIG. 5, the upper plate 9 and the lower plate 10 are made of die-cast aluminum alloy, for example, and are formed into a substantially flat plate shape, each having drive shaft insertion holes 12, 12 on the left and right in the center, and furthermore, on the four corners and in the front. Connecting screw 1 each in the center in the left and right direction
It has a screw fastening boss 14 through which the liner sheet 15 is passed, and sheet regulating pins 16 for regulating the position of the liner sheet 15 are protrudingly provided at the front and rear of the center thereof. Further, the front end of each of the upper plate 9 and the lower viio has front teeth 17 that form the recording/reproducing head insertion port 4, the erasing head insertion port 5, and the pinch roller insertion port 6, and the erasing head insertion port 5 and the pinch roller insertion port It has capstan insertion holes 18 facing each of the openings 6, and a positioning reference hole 1.
It has 9. In addition, block regulating recesses 20, 20 for regulating the position of the tape guide block 8 are formed on the front side of each inner surface of the upper and lower plates 9, 1O. It is preferable that each of the upper plate 9 and the lower plate 10 has a honeycomb-shaped uneven portion 21 on its inner surface to avoid resonance.

In addition, as shown in FIG. 5, window holes 2 and 12 are provided between the drive shaft insertion holes 12 and 12 of the upper plate 9 and the lower plate 10, respectively.
2 is fitted with a transparent window plate 23.

In FIGS. 3 and 4, the middle frame 11 is made of ABS, for example.
The resin is used to form a cap into a substantially U-shaped planar shape.

That is, the middle frame 11 has a rear frame part 11a that is interposed between the upper and lower plates 9 and 10 and closes the rear side thereof, and left and right frame parts 11b and llc that close the left and right sides of the rear frame part 11a. Left and right frame portion 11b-1
At each front end of the frame 1c, there are left and right front frame parts 11d that close the left and right ends of the front side between the upper and lower plates 9 and 10 and form an erasing head insertion opening 5 and a pinch roller insertion opening 6 with the front teeth 17.
-11d are installed in series. At the four corners of the middle frame 11 are upper and lower plates 9.
- Has coupling holes 24 into which the screw fastening bosses 14 at the four corners of IO are butt-fitted.

A reinforcing rib 27 is integrally attached to the inner circumference of the middle frame 11.

In this case, in order to avoid molding defects such as sink marks on the outer surface of the inner frame 11 opposite to the reinforcing ribs 27, as shown in FIG. It juts out from the center. The thickness a of the reinforcing rib 27 is set to be equal to or less than the thickness b of the middle frame 11. Further, by forming the reinforcing rib 27 in a shape along the maximum winding diameter of the tape 2, it is possible to prevent the tape 2 from loosening radially outward from the maximum winding diameter due to vibration or the like.

In FIGS. 2 and 5, tape guide block 8
is molded from plastic, for example, AS resin or ABS resin, and by molding the tape guide block 8 separately from plastic, it is possible to obtain a block with excellent dimensional accuracy and excellent tape running properties using plastic. . This tape guide block 8 has a strip-shaped substrate 28.
and vertical left and right guide ribs 29, 29, etc., which project symmetrically forward from the left and right ends of the front surface of the board 28.
Vertical center guide ribs 30, 30 protrude symmetrically forward from the center of the front surface of the substrate 28, and symmetrically extend forward from between the left and right guide ribs 29, 29 and the center guide ribs 30, 30 on the front surface of the board 28. It has vertical intermediate guide ribs 31 that protrude.

In assembling it, as shown in FIG.
superimposed on the inner surface of the rear and left and right sides. In this case, a positioning rib 33 is provided on the lower end surface of the middle frame 11 as shown in FIG. Once fitted, both fastening bosses 14.1
Positioning and holding between 4 spaces can be performed reliably. In addition, the lower plate 10
A tape guide block 8 is positioned and held in the block regulating recesses 20, 20 on the inner surface of the tape guide block 8, and tape guide rollers 7, 7 are rotatably arranged with a shaft 35 on the left and right sides of the tape guide block 8. . Lower plate 1
A lower liner sheet 15 is laid on the inner surface of the shaft 1, and the position of the sheet 15 is regulated by sheet regulating bins 16, 16, and then the hubs 3, 3 are placed over the drive shaft insertion holes 12, 12. A magnetic shielding plate 36 and a pad 37 are assembled on the front side of the tape guide block 8 at the inner back of the recording/reproducing head insertion slot 4. Then, the tape 2 fed out from one hub 3 is passed through the tape guide rollers 7, 7 to a tape running path between the tape guide rollers 8 and the front teeth 18, and is wound around the other hub 3.

Next, the screw fastening bosses 14 at the four corners of the upper plate 9 are fitted into the coupling holes 24 at the four corners of the middle frame 11, and the screw fastening bosses 14 at the front center are fitted into the screw fastening bosses 14 at the front center of the lower plate 10. By directly butting and fitting the upper plate 9 to the middle frame 11
The upper liner sheet 15 is placed on top of the liner sheet 15. In this case, as in the case of the lower plate 9, as shown in FIG.
If a positioning rib 33 is provided on the upper end surface of the upper plate 1 and a positioning rib 34 provided on the inner surface of the upper plate 9 corresponding to the rib 33 is fitted into the rib 33, the fastening bosses 14 of both・Positioning can be reliably maintained between 14.

Finally, attach the coupling screws 13 to the screw fastening bosses 1 at the four corners of the upper plate 9.
By screwing in from 4, the upper plate 9, middle frame 11, and lower plate 10 are integrally connected, and the tape guide block 8 is also clamped and fixed between the upper and lower plates 9 and 10.

Example C] In the middle frame 11, it is preferable to provide the reinforcing ribs 27 over almost the entire inner circumference of the middle frame 11 in order to increase the strength of the whole middle frame 11. However, when the outer size of the tape cartridge is small, The rear frame part 11a and the left frame part 11b of the middle frame 11
It may be attached only to the corner where the rear frame portion 11a and the right frame portion ttc intersect.

The tape guide block 8 can also be molded integrally with the middle frame 11.

[Brief explanation of drawings]

The drawings show an embodiment of the tape cartridge according to the present invention, and FIG. 1 is an enlarged sectional view taken along the line B-B in FIG. 2, FIG. 2 is an internal plan view, and FIG. 3 is a plan view of the inner frame. , FIG. 4 is a sectional view taken along line A-A in FIG. 3, and FIG. 5 is an exploded perspective view. l...Body case, 2...Tape, 8...Tape guide block, 9...Upper plate, lO...Lower plate, 11...Medium Frame, 27...Reinforcement rib.

Claims (1)

[Claims] 1. The main body case 1 has upper and lower plates (9
・10) and a plastic inner frame (11) that is interposed and fixed between the upper and lower plates (9 and 10) so as to close the left and right sides and the rear side to form a tape storage space inside. Reinforcing ribs (27) are provided at least at the corners of the inner periphery of the frame (11).
) is integrally molded into a tape cartridge. 2. The tape cartridge according to claim 1, wherein the upper and lower plates (9, 10) are made of metal.