JPH0422473Y2 - - 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 the cassette to be attached to this printed circuit board, thereby reducing the thickness of the cassette. To cover a wiring pattern surface on which a printed circuit board cassette is mounted in a tape recorder with a decorative plate, and to arrange the decorative plate sufficiently close to the wiring pattern surface without risk of electrical shot on the wiring pattern surface side. As a result, the cassette tape recorder has a good appearance, is safe and durable, and can further be made thinner.

[Conventional technology]

As a known technique, there is Japanese Utility Model Application Publication No. 52-164519, in which the above-mentioned components are directly attached to predetermined locations on a printed circuit board on which electrical connections between the components constituting the tape recorder are printed in advance. This is a constructed cassette tape recorder.

According to this known technique, a printed circuit board is used as a chassis, making it possible to omit the work of electrically connecting parts to each other, and making it possible to make the cassette tape recorder thinner.

[Problem that the invention attempts to solve]

However, even if this known technique is used to mount the cassette on, for example, the wiring pattern side of the printed circuit board constituting the chassis, the external appearance will be very poor. In other words, the wiring pattern surface on which the cassette is installed is visible from the outside, while the wiring pattern surface has an uneven surface from which the wiring patterns and the leads of the mounted electronic components protrude, making the external appearance extremely difficult. It is bad for However, even if the wiring pattern surface is covered with a metal plate used in conventional cassette tape recorders, there is a risk of electrical shortcuts if the plate comes into contact with the leads of electronic components. This becomes a problem, and the decorative plate must be placed at a sufficient distance from the wiring pattern surface to a safe height. If the decorative plate is separated from the wiring pattern surface, the height of the cassette attached to the printed circuit board will increase, resulting in a thicker cassette tape recorder, and it will be difficult to use the printed circuit board as a chassis. The effect of making the cassette tape recorder thinner is lost.

The present invention covers the wiring pattern surface on which a printed circuit board cassette is mounted with a decorative plate, and also allows the decorative plate to be brought sufficiently close to the wiring pattern surface without the risk of electrical shoots on the wiring pattern surface side. It is.

[Means for solving problems]

In this invention, a pair of left and right mechanical parts such as reel stands are attached to the wiring pattern side of a printed circuit board on which electronic components constituting the electronic circuit of a tape recorder are mounted, and a cassette is mounted on the wiring pattern side of this printed circuit board. In the tape recorder configured to be mounted, a decorative plate covering the wiring pattern surface of the printed circuit board is provided between the wiring pattern surface of the printed circuit board and the cassette, and the decorative plate is made of an insulating plate to prevent the wiring pattern from being attached. This is a cassette tape recorder mounted on a printed circuit board in close proximity to the cassette tape recorder.

[Effect]

According to the present invention, the wiring pattern surface of a printed circuit board used as a chassis, on which a cassette is mounted, can be covered with a decorative plate, and the decorative board also serves as a reinforcing plate for the printed circuit board used as a chassis. Moreover, since the decorative plate is made of an insulating plate, the decorative plate should be mounted on the printed circuit board sufficiently close to the wiring pattern surface to a height where it will come into contact with the leads of electronic components protruding from the wiring pattern surface. However, there is no danger of electrical shorts on the wiring pattern side.

〔Example〕

An embodiment of a cassette tape recorder to which the present invention is applied will be described below with reference to the drawings. 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.

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 upper surface of the printed circuit board 10 is configured as a wiring pattern surface 10a, and the lower surface is configured as a component mounting surface 10b.

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 wiring pattern surface 10a side of the printed circuit board 10 via a pair of left and right reel stand bearings 28, and similarly, the cassette mounting stand 14
A cassette pressing spring 15 is also attached to the wiring pattern surface 10a side of the printed circuit board 10.

In addition, a pair of left and right cassette positioning pins 16
a, 16b, a capstan 17, and a motor 18 are attached to the upper part of a guide base 29 made of synthetic resin. However, the cassette positioning pins 16a and 16b are integrally molded on the guide base 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 guide base 29. There is. And guide base 2
9 has a structure in which each pair of locking pawls 32 integrally molded at both ends in the longitudinal direction locks into each pair of locking holes 33 provided in the printed circuit board 10, so that the component mounting surface 10b side of the printed circuit board 10 is secured. It is removably attached to the Cassette positioning pins 16a, 16b and capstan 17 protrude from insertion holes 34a, 34b, 35 provided in printed circuit board 10 toward wiring pattern surface 10a. 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 wiring pattern surface 10a side of the printed circuit board 10, and has a pair of parts integrally molded on the upper part of the guide base 29 and protruding from an opening 36 provided in the printed circuit board 10 toward the wiring pattern surface 10a side. The head mounting base 22 is placed on the upper part of the protrusion 37, and has a T-shaped guide piece 38 and a pair of locking claws 39 integrally molded on the lower part of the head mounting base 22. It is slidably and removably attached to the wiring pattern surface 10a side of the printed circuit board 10 by being engaged with the holes 40 and 41.

Further, the push button lock plate 26 is slidably screwed to the lower part of the guide base 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 a fast forward button 24 and a stop button 25 are arranged between a guide base 29 and a push button lock plate 26, and these push buttons have a T-shaped guide piece 4 integrally formed on the upper part thereof.
4, 45 as printed circuit board 10 and guide base 2
It is slidably attached to guide holes 46 and 47 provided in 9. 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.The cassette 1 is mounted horizontally on the wiring pattern surface 10a of the printed circuit board 10 as shown by the chain line in FIG.
3a and 13b, and the cassette tape 3 is wrapped around the capstan 17. At this time, the cassette 1 is attached to the cassette positioning pins 16a and 16b.
The cassette 1 is engaged with and placed on the cassette mounting table 14 and fixed by the cassette pressing spring 15, so that the cassette 1 is horizontally positioned at a predetermined height position with respect to the guide base 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. Then, the cassette tape 3 is 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 main parts of the cassette tape recorder will be explained.

First, a decorative plate 5 is placed at the bottom of the cassette 1 and covers the wiring pattern surface 10a of the printed circuit board 10.
4 is provided. This decorative plate 54 is composed of an insulating plate molded from an insulating material such as synthetic resin, and is fixed to the wiring pattern surface 10a of the printed circuit board 10 using a plurality of set screws 55. It is installed almost parallel to the Note that the reel stands 13a and 13b, the cassette mounting stand 14, and the cassette positioning pins 16a and 1
6b, the capstan 17, etc. are inserted through the respective insertion holes 56, 57, 58, and 59 provided in the decorative plate 54, and protrude above the decorative plate 54.

By the way, as shown in FIG.
In the electronic component 12 mounted on the wiring pattern 11, the leads 12a are inserted from the component mounting surface 10b side and protrude toward the wiring pattern surface 10a side, and these leads 12a are soldered to the wiring pattern 11.

On the other hand, since the decorative plate 54 is composed of an insulating plate, the decorative plate 54 is brought sufficiently close to the wiring pattern surface 10a to a height where it contacts the leads 12a of the electronic component 12 protruding from the wiring pattern surface 10a. Also, the wiring pattern surface 10a due to the contact
There is no risk of electrical shortcuts on the side.

Therefore, as shown in FIG.
The mounting height _H1 of the decorative plate 54 relative to the printed circuit board 10 can be made sufficiently low, and the mounting height _H2 of the cassette 1 mounted on the upper part of the decorative plate 54 relative to the printed circuit board 10 can be significantly reduced. It is possible to make the entire recorder extremely thin.

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.

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 since the wiring pattern surface of the printed circuit board on which the cassette is mounted is covered with a decorative plate, the appearance is very good. Additionally, the printed circuit board used as the chassis is reinforced by the plaque, making the chassis extremely durable. Furthermore, the decorative board can be mounted on the printed circuit board sufficiently close to the wiring pattern without the risk of electrical shock on the wiring pattern side, making it extremely safe.
By making the height of the cassette mounted on the wiring pattern side of the printed circuit board sufficiently low, the printed circuit board can be used as a chassis, and the cassette tape recorder can be made even thinner.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a sectional view of the main part (Fig. 2 - arrow direction), Fig. 2 is a plan view of the main part, and Figs. The figure is an exploded perspective view of the entire device. In addition, in the symbols used in the drawings, 1...cassette, 10...printed circuit board, 10a...wiring pattern surface, 12...electronic component, 13a...reel stand, 13b...reel stand, 54...decoration plate ,5
5...It is a set screw.

Claims (1)

[Scope of Claim for Utility Model Registration] Mechanical parts such as a pair of left and right reel stands are attached to the wiring pattern side of a printed circuit board on which electronic components constituting the electronic circuit of a tape recorder are mounted, and the wiring pattern surface of this printed circuit board is In a tape recorder configured to have a cassette mounted on the side, a decorative plate covering the wiring pattern surface of the printed circuit board is provided between the wiring pattern surface of the printed circuit board and the cassette, and the decorative plate is made of an insulating plate. A cassette tape recorder, characterized in that the cassette tape recorder is mounted on the printed circuit board in a state in which the cassette tape recorder is in close proximity to the wiring pattern.