JPS6018859Y2 - Printed wiring board mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a printed wiring board mounting device that is particularly suitable for use in tape recorders that are intended to be smaller (thinner).

Recently, for example, cassette tape recorders and the like have been trending toward smaller size, lighter weight, and multifunctionality, and in particular, there is a desire for devices that are thin and can be easily carried in a pocket or the like.

Incidentally, in such a cassette tape recorder, a minimum space must be provided in the small cabinet to accommodate the tape cassette, batteries, and the like.

Therefore, how to miniaturize the other tape recorder mechanisms, circuits, operation parts, etc., and how to organically arrange them within the cabinet to contribute to miniaturization (thinness) has become a major problem. There is a lot of development going on in this direction.

In conventional cassette tape recorders, the chassis on which the tape recorder mechanism is mounted and the printed circuit board on which the tape recorder circuit is constructed are overlapped to make the cassette tape recorder smaller in width and depth. Some are designed to reduce the height of the cassette tape recorder by arranging the chassis and the printed wiring board in a two-dimensional manner, thereby reducing the height of the cassette tape recorder, that is, making it thinner.

However, in the case where the chassis and the printed wiring board are overlapped, the thickness and height of the mechanical parts of the chassis and the circuit parts of the printed wiring board are added to the height of the cassette tape recorder, making it thinner. There is a problem that it is contrary to.

Further, in the case where the chassis and the printed wiring board are arranged in a plane, the cassette tape recorder becomes thinner, but there is a problem in that the shape of the cassette tape recorder in the plane direction becomes larger.

Therefore, there has been a strong desire to develop a configuration that allows cassette tape recorders to be made smaller in plan and thinner in height.

This invention was made based on the above-mentioned circumstances, and the object thereof is to provide an extremely good printed wiring board mounting device that has a simple structure and can sufficiently contribute to making tape recorders smaller and thinner.

Hereinafter, one embodiment of this invention will be described in detail with reference to the drawings.

That is, FIG. 1 shows the external appearance of a cassette tape recorder to which this invention has been applied, and this cassette tape recorder has its mechanical part, circuit part, operating part, etc. installed in a thin box-shaped cabinet 11. That's what happens.

The cabinet 11 has, for example, a height of about 160 mm, a width of about 85 mm, and a thickness of about 19.8 mm.
It has an extremely small (especially thin) structure, and is large enough to be easily carried by the user and easily fit into a pocket.

Here, on the front panel 12 of the cabinet 11,
A cassette lid 1 that covers a housing section of a tape cassette (not shown)
3. Speaker unit 14, counter 15, reset button 16 for the counter 15. A first light emitting diode 17 for indicating that the cassette tape recorder is in recording mode.
and a second light emitting diode 1 for indicating battery power consumption.
8 etc. are arranged respectively.

The first side panel 19 of the cabinet 11 also includes a rewind operator 20, a fast forward operator 21, a record operator 22, a playback operator 23, a stop/eject operator 24, and an operator for temporarily stopping tape running. Each operator such as 25 is provided.

Furthermore, the second side panel 26 of the cabinet 11 includes a microphone 27 and an external microphone jack 28.
, a remote jack 29 for an external microphone with a remote plug, an earphone jack 30, a volume adjustment operator 31, an on-air switch 32, a tape running speed adjustment operator 33, a carrying band 34, etc. It is arranged.

Here, the external microphone with a remote plug is one that has a remote plug outside the main plug and a switch on the grip part of the microphone body, and connects both plugs to the external microphone jack 28 and By turning on and off the above switches while connected to the remote jacks 29, signals from the external microphones can be supplied or not supplied to the cassette tape recorder.

On the other hand, when the plug of an external microphone without a remote plug is connected to the external microphone jack 28, all signals from the external microphone are supplied to the cassette tape recorder.

Also, when the on-air switch 32 is operated, a tape playback signal, a tape recording signal from the microphone 27,
A signal that is supplied from an external microphone, a signal that is a mixture of the reproduction signal and the supply signal, or a signal that is a mixture of the recording signal and the supply signal, for example, can be FM-modulated and radiated to the outside from an antenna line (not shown). It is.

The radiated FM waves can be received by an FM receiver or the like (not shown).

Furthermore, the tape running speed adjustment operator 33 is built in the cabinet 11 and changes the rotational angular speed of a motor for running the tape (for example, within a range of about ±1O [%] of the normal rotational angular speed). The tape running speed can be changed, and the user can freely select an appropriate tape running speed especially during recording or playback.

In addition, the cassette tape recorder can be operated to rewind or fast-forward by operating the rewind or fast-forward operators 20 and 21 in the playback state.
You can play, rewind, review) or fast forward (cue) playback.

Furthermore, the tape can be automatically stopped when it reaches the end or the like.

Here, as shown in FIG. 2, an external power supply jack 36 and an external antenna jack 37 are provided on the third side panel 35 corresponding to the lower surface of the cabinet 11 in FIG. 1.

This external power supply jack 36 is supplied with power obtained by step-down rectification of power from a household AC power supply using an adapter (not shown), and this cassette tape recorder can be used with batteries or an external power supply. There is.

Further, the external antenna jack 37 is connected to the external antenna for broadcasting the FM waves described above.

Here, in FIG. 3, a tape recorder mechanism section (indicated by a two-dot chain line in the figure) 38, a printed wiring board 39 as a circuit section, a speaker 40, etc. are attached to the front panel 12, and the first and third measurements are performed. It shows the state in which the face panels 19 and 35 are attached.

First, in the tape recorder mechanism section 38, the part shown by the two-dot chain line in the figure is the main chassis, and on this main chassis are the rewind 11, fast forward, recording and playback controls 20, which are not visible in FIG. - 23 in their operating positions and release the locks by operating the stop/eject operator 24; a recording/reproducing head, an erasing head,
A head chassis that moves pinch rollers and the like to predetermined positions, a pair of reel shafts to which tape cassettes are attached, and a reel that is moved to predetermined positions in conjunction with the operations of the rewind, fast forward, and playback operators 20, 21, and 23. A motor 41, such as an idler or a gear that transmits rotational force to a shaft,
A flywheel 42 and the like to which rotational force of 1 is transmitted is attached.

Here, the idler, gear, and flywheel 42
is rotatably supported between a main chassis and sub-chassis 381, 382 arranged in parallel with the main chassis.

The part where the sub-chassis 381 and 382 are installed is
This is the thickest part of the tape recorder mechanism section 38.

On the other hand, the main printed wiring board 39 is, for example, a flexible printed wiring board, and as is clear from FIG. The cabinet 11 is shaped so that it can be disposed in a manner that contributes to making the cabinet 11 thinner.

Incidentally, in reality, due to the configuration of the tape recorder mechanism section 38, the circuit relationship of the main printed wiring board 39, etc., parts A and B where the sub-chassis 381, 382 and the main printed wiring board 39 overlap are inevitably formed.

Therefore, as mentioned above, only the circuit pattern 391 is formed on the main printed wiring board 39 in parts A and B that overlap with the sub-chassis 381 and 382, and no circuit components (for example, resistors, capacitors, etc.) are attached. do.

That is, the circuit components attached to the main printed wiring board 39 are as follows:
A chip element is used to make it thinner, but even if this chip element is used, the soldering part is thick, so the thickness of the main printed wiring board 39, the chip element, and the solder is usually about 1. 0 [view] to 1.5 (mm), and the part where this circuit component (chip element) is soldered is the thickest part of the main printed wiring board 39.

Conversely, the portion of the main printed wiring board 39 where the circuit pattern 391 is formed has the smallest thickness.

Therefore, the part of the main printed wiring board 39 that overlaps with the part where the sub-chassis 381, 382 of the tape recorder mechanism section 38 are provided (the part with the greatest thickness) is replaced with the part where the circuit pattern 391 is formed (the part with the smallest thickness). part)
By doing so, the thickness including the tape recorder mechanism section 38 and the main printed wiring board 39 is minimized, which can sufficiently contribute to making the entire device thinner.

In this case, the surface of the main printed wiring board 39 on which the circuit pattern 391 is not formed is connected to the sub-chassis 3.
By arranging the sub-chassis 381, 382 to face each other, the sub-chassis 381, 382 and the main printed wiring board 39 can be brought into close contact with each other, thereby contributing to further reduction in thickness.

Note that this invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

Therefore, as detailed above, according to this invention, a circuit pattern is provided without attaching circuit components to the portion of the printed wiring board that overlaps with the sub-chassis, and a circuit pattern is provided on the printed wiring board that overlaps with the sub-chassis. Since the circuit components are attached to the parts where they are not needed, it is possible to provide an extremely good printed wiring board mounting device that has a simple structure and can sufficiently contribute to making the tape recorder smaller and thinner.

[Brief explanation of drawings]

1 and 2 are an external view and a bottom view, respectively, showing a cassette tape recorder to which this invention is applied, and FIG. 3 is a plan view showing an embodiment of a printed wiring board mounting device according to this invention. . 11... Cabinet, 12... Front panel, 13... Cassette lid, 14...
・Speaker section, 15...Counter, 16...
... Reset button, 17... First light emitting diode, 18... Second light emitting diode, 19.
...First side panel, 20... Rewind operator, 21... Fast forward operator, 22...
... Recording control, 23... Playback control, 24.
...Stop and eject control, 25...
Operator for temporarily stopping tape running, 26...Second panel, 27...Microphone, 28...
... Jack for external microphone, 29 ... Jack for remote, 30 ... Earphone jack, 31 ... Volume adjustment control, 32 ...
- On-air switch, 33... Operator for adjusting tape running speed, 34... Carrying band, 35... Third side panel, 36...
・External power supply jack, 37... External antenna jack, 38... Tape recorder mechanism section,
39...Main printed wiring board, 40...Speaker, 41...Motor, 42...Flywheel.

Claims (1)

[Scope of utility model registration request] In a printed wiring board mounting device in which a printed wiring board is disposed in a tape recorder mechanism section that supports a movable member by sandwiching it between a main chassis and a subchassis, a portion of the printed wiring board that overlaps with the subchassis. A printed wiring board characterized in that a circuit pattern is disposed on the printed wiring board without circuit components attached thereto, and the circuit components are attached to a portion of the printed wiring board that does not overlap with the sub-chassis. Mounting device.