JPH0422472Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a cassette tape recorder that can be constructed thinly.

[Summary of the idea]

The present invention uses a printed circuit board on which electronic components constituting the electronic circuit of a tape recorder are mounted as a chassis, and allows a cassette to be attached to this printed circuit board, and all that is required is to attach a capstan to the printed circuit board. By making it possible to electrically connect the capstan to the ground pattern provided on the printed circuit board, the capstan can be electrically connected to the ground pattern provided on the printed circuit board with an extremely simple structure. It is designed so that it can be discharged.

[Conventional technology]

Conventionally, in tape recorders, etc., the capstan is easily charged with static electricity, and when the charged static electricity is discharged into the atmosphere, noise is generated, so the static electricity charged on the capstan must be discharged to the ground. There is.

At this time, if a metal bearing is attached to a metal bearing attachment member, and this bearing attachment member is attached to a metal chassis, and the capstan is rotatably supported by the metal bearing, the capstan and the earthed metal chassis are electrically connected. There is no problem since it is connected to.

However, as in the conventional example shown in FIG.
Capstan mounting member 61 molded from synthetic resin
In the case of a structure in which a metal bearing 62 is attached to the metal chassis 63, and this capstan mounting member 61 is attached to a metal chassis 63, and the capstan 64 is rotatably supported by the metal bearing 62, the connection between the capstan 64 and the metal chassis 63 which is the ground is The space between them is electrically insulated by the capstan mounting member 61 made of synthetic resin.

Therefore, conventionally, as shown in FIG. 7, the tip of a metal plate 66 attached to the metal chassis 63 with screws 65 is brought into contact with one end of the metal bearing 62, so that the static electricity charged in the capstan 64 is transferred to the metal bearing. 62 and a metal plate 66 to discharge the metal chassis 63 which is the ground.

[Problem that the invention attempts to solve]

However, the conventional structure shown in FIG. 7 requires special electrical connection means consisting of screws 65 and metal plates 66, and requires a large number of parts and assembly man-hours, resulting in high costs.

The present invention uses a printed circuit board on which electronic components constituting the electronic circuit of a tape recorder are mounted as a chassis, and allows a cassette to be attached to this printed circuit board, and all that is required is to attach a capstan to the printed circuit board. And, without using any special electrical connection means,
This allows the capstan to be electrically connected to a ground pattern provided on a printed circuit board.

[Means for solving problems]

In this invention, mechanical components such as a pair of left and right reel stands are attached to a printed circuit board on which electronic components constituting the electronic circuit of a tape recorder are mounted, and a capstan mounting member is provided in which the capstan is rotatably attached via a metal bearing. is attached to the printed circuit board, and the cassette is mounted on the printed circuit board, and by attaching the capstan mounting member to the printed circuit board, the metal bearing is brought into direct contact with the ground pattern provided on the printed circuit board. This is what I did.

[Effect]

The present invention is a cassette tape recorder in which a cassette is mounted on a printed circuit board, and the printed circuit board is used as a chassis. Moreover, by simply attaching the capstan to the printed circuit board using the capstan mounting member, the capstan can be electrically connected to the ground pattern provided on the printed circuit board without using any special electrical connection means.

〔Example〕

An embodiment of a cassette tape recorder to which the present invention is applied will be described below with reference to FIGS. 1 to 6. The cassette tape recorder shown here is a reproduction-only machine that uses a compact cassette.

First, the entire cassette tape recorder will be explained with reference to FIGS. 2 to 6.

First, a conventionally known cassette (compact cassette) 1 has a pair of left and right reel hubs 2a, 2b inside.
A cassette tape 3, which is a magnetic tape wound around the tape, is housed in the head insertion hole 4, a pair of left and right pinch roller insertion holes 5a and 5b, capstan insertion holes 6a and 6b, and a cassette positioning pin insertion hole 7.
a, 7b, reel stand insertion holes 8a, 8b, etc. are provided.

Next, the printed circuit board 10 constitutes the electronic circuit of the tape recorder, and a large number of electronic components 12 are mounted at predetermined locations on the printed wiring pattern 11. In this case, the lower surface 10b of the printed circuit board 10 is configured as a wiring pattern surface, and the upper surface 10a is configured as a component mounting surface.

Next, this printed circuit board 10 is used as a chassis for a tape recorder, and this printed circuit board 10 includes a pair of left and right reel stands 13.
a, 13b, a cassette mounting table 14, a cassette pressing spring 15 made of a leaf spring, a pair of left and right cassette positioning pins 16a, 16b, a capstan 17,
a motor 18, a magnetic head 19 which is a reproduction head,
Pinch roller 20, tape guide 21, head mount 22, play button 23, fast forward button 24, stop button 25
Mechanical parts such as push buttons, push button lock plates 26, and various other mechanical parts such as various springs, levers, and switches are attached.

By the way, the pair of left and right reel stands 13a, 13b
is rotatably attached to the upper surface 10a of the printed circuit board 10 via a pair of left and right reel stand bearings 28, and similarly, the cassette mounting table 14 and the cassette pressing spring 15 are also attached to the upper surface 10a of the printed circuit board 10.
attached to the side.

In addition, a pair of left and right cassette positioning pins 16
a, 16b, capstan 17 and motor 18 are capstan mounting members 2 made of synthetic resin.
It is attached to the top of 9. However, the cassette positioning pins 16a and 16b are integrally molded on the capstan mounting member 29, and the capstan 17 and motor 18 are rotatably and fixedly attached to a capstan bearing 30 and a motor mounting portion 31 that are integrally molded on the capstan mounting member 29. It is being The capstan mounting member 29 has both ends in its longitudinal direction secured to a pair of left and right setscrews 33 inserted into a pair of left and right screw insertion holes (however, one screw insertion hole is a long hole) 32 provided in the printed circuit board 10. It is removably screwed to the lower surface 10b side of the printed circuit board 10. Then, the cassette positioning pins 16a, 16b and the capstan 17 are inserted into the insertion holes 34a, 34b, 3 provided in the printed circuit board 10.
5 to the upper surface 10a side. The motor 18 is connected to a predetermined location of the wiring pattern 11 of the printed circuit board 10 by a lead wire 50.

Further, the magnetic head 19, pinch roller 20, and tape guide 21 are attached to the upper part of a head mount 22 made of synthetic resin. However, the tape guide 21 is integrally molded with the head mounting base 22. The head mounting base 22 is disposed on the top surface 10a side of the printed circuit board 10, and has a pair of protrusions 37 that are integrally molded on the top of the capstan mounting member 29 and protrude from an opening 36 provided in the printed circuit board 10 toward the top surface 10a side. The head mounting base 22 has a T-shaped guide piece 38 and a pair of locking claws 39 that are integrally molded on the lower part of the head mounting base 22.
It is slidably and removably attached to the upper surface 10a side of the printed circuit board 10 by being engaged with guide holes 40, 41 provided in the parts 9.

Further, the push button lock plate 26 is slidably screwed to the lower part of the capstan mounting member 29 by a pair of set screws 43 inserted through a pair of elongated holes 42 provided at both ends of the push button lock plate 26 in the longitudinal direction. Push buttons such as the fast forward button 25 and the stop button 26 are arranged between the capstan mounting member 29 and the push button lock plate 26, and these push buttons have T-shaped guide pieces 44 and 45 integrally molded on their upper parts. The guide holes 46 and 47 provided in the printed circuit board 10 and the capstan mounting member 29 are engaged with the guide holes 46 and 47 so as to be slidable. However, the regeneration button 23 is integrally molded with the head mounting base 22. The sliding members such as the head mounting base 22, fast forward button 24, stop button 25, push button lock plate 26, etc. are each biased back by a return spring 48, and the motor 18, reel stand 13b, and capstan 17 are interlocked by a belt 49.

The cassette tape recorder is constructed as described above, and the cassette 1 is mounted horizontally on the upper surface 10a of the printed circuit board 10 as shown by the chain lines in FIGS. 2, 3, 5, and 6, and the reel hub is 2a,
2b is engaged with the reel stands 13a, 13b, and the cassette tape 3 is wrapped around the capstan 17. At this time, the cassette 1 is engaged with and placed on the cassette positioning pins 16a, 16b and the cassette mounting table 14, and is fixed by the cassette pressing spring 15, so that the cassette 1 is attached to the capstan mounting member which functions as a guide base. It is horizontally positioned at a predetermined height position with reference to 29.

After this cassette is installed, when the playback button 23 is pushed from the backward movement position shown by the chain line to the forward movement position shown by the solid line in FIG. A lock pin 51 integrally formed at the bottom of the head mounting base 22 is attached to the push button lock plate 2.
It is locked by the lock hole 52 of No. 6. Then, the magnetic head 19, the pinch roller 20, and the tape guide 21 are inserted into the cassette 1, the magnetic head 19 and the tape guide 21 are brought into contact with the cassette tape 3, and the cassette tape 3 is pressed onto the capstan 17 by the pinch roller 20. be done. Then, a switch (not shown) attached to the printed circuit board 10 by the head mount 22 is operated, the motor 18 is operated, and the reel stand 13b and the capstan 17 are rotationally driven. The cassette tape 3 is then run at a constant speed by the capstan 17 to perform desired reproduction.

Incidentally, when the fast forward button 24 is pressed, the switch is operated in the same manner, the motor 18 is activated, and the cassette tape 3 is fast forwarded by the reel stand 13b.

Furthermore, when the stop button 25 is pressed during playback or fast forward, etc., the head mounting base 22 or the fast forward button 24 are unlocked by the push button lock plate 26, and these are moved back by the return spring 48 and the switch is turned off. is turned off, and the motor 18 is stopped.

Next, the electrical connection structure between the capstan 17 and the printed circuit board 10 will be explained with reference to FIGS. 1 and 2.

First, as mentioned above, the capstan mounting member 2
Reference numeral 9 is molded from synthetic resin, and a metal bearing (oil-impregnated bearing or the like) 54 is attached by press-fitting or the like into a capstan bearing 30 that is integrally molded with this capstan attachment member 29 . and capstan 1
7 is rotatably supported by this metal bearing 54.

Next, as mentioned above, the capstan mounting member 2
9 is screwed to the lower surface 10b side of the printed circuit board 10 with a pair of left and right setscrews 33, the upper end surface 54a of the metal bearing 54 is attached to the lower surface 1 of the printed circuit board 10.
Ground pattern 5 printed on 0b
5 is brought into direct pressure contact.

Therefore, according to this electrical connection structure, no special electrical connection means is used, and the capstan mounting member 29 can be attached to the printed circuit board 10 by screwing or the like.
7 can be electrically connected to a ground pattern 55 provided on the printed circuit board 10 via a metal bearing 54.

Since the static electricity charged in the capstan 17 is discharged to the ground pattern 55 of the printed circuit board 10 via the metal bearing 54, there is no possibility that the static electricity will be discharged into the atmosphere and generate noise.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in order to attach the capstan mounting member 29 to the printed circuit board 10, a screwing method was adopted in the embodiment. It may be attached by a structure in which the locking claws are locked to the printed circuit board 10.

Furthermore, the present invention is not limited to cassette tape recorders that use compact cassettes;
It is applicable to various cassette tape recorders that use micro cassettes and other various cassettes.

[Effect of idea]

The present invention is a cassette tape recorder that uses a printed circuit board as a chassis, and is capable of discharging static electricity charged on the capstan to a ground pattern provided on the printed circuit board. By simply attaching the capstan to the capstan mounting member and the printed circuit board used as a chassis, the capstan can be electrically connected to the ground pattern provided on the printed circuit board without using any special electrical connection means. Therefore, the structure for discharging static electricity is extremely simple, and the number of parts and assembly steps can be reduced. In particular, since the capstan can be attached to the printed circuit board and the electrical connection described above can be performed simultaneously, assembly and disassembly are easy.

[Brief explanation of drawings]

1 to 6 show an embodiment of the present invention, in which FIG. 1 is a sectional view of the main part, FIG. 2 is a sectional view of FIG. 5, and FIGS. 3 and 4. is an exploded perspective view of the whole, Fig. 5 is a plan view of the whole, and Fig. 6 is an exploded perspective view of the whole.
Figure - sectional view. FIG. 7 is a sectional view of a conventional example. In addition, in the symbols used in the drawings, 1...Cassette, 10...Printed circuit board, 13a...Reel stand, 13b...Reel stand, 17...Capstan, 29...Capstan mounting member, 33...Set screw, 54...metal bearing, 55...ground pattern.

Claims (1)

[Claim for Utility Model Registration] Mechanical components such as a pair of left and right reel stands are attached to a printed circuit board on which electronic components constituting the electronic circuit of a tape recorder are mounted, and a capstan is rotatably attached via a metal bearing. A capstan mounting member is attached to the printed circuit board so that the cassette is mounted on the printed circuit board, and by attaching the capstan mounting member to the printed circuit board, the metal bearing is connected to the ground provided on the printed circuit board. A cassette tape recorder in direct contact with the pattern.