JPS6030870Y2 - Power supply mounting mechanism - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mounting mechanism for a power supply unit, and particularly to one that takes safety measures to prevent accidents such as electric shock.

In recent years, there has been a trend toward higher fidelity, an emphasis on sound quality, and multifunctionality in small portable audio equipment such as cassette tape recorders with radios. Various developments are being actively carried out, including the realization of a stereo-type cassette tape recorder with a radio.

By the way, in the above-mentioned audio equipment, while the number of various mechanical parts to realize various functions increases,
Since it is portable, it is desirable that it be small and lightweight.

For this reason, in the past, the printed wiring board was placed at the rear of the rear cabinet so that it was approximately parallel to the rear panel of the rear cabinet, and the mechanical parts of the cassette tape recorder, the speaker body, etc. They are arranged so that they overlap in front.

However, in such a configuration, the mechanical section of the cassette tape recorder must be attached to the rear cabinet to which the printed wiring board is attached, so the work space is small and the installation work tends to be complicated.

Further, the printed wiring board itself is generally attached using a plurality of screws, which poses a problem in terms of work efficiency.

Furthermore, since the printed wiring board, mechanical parts, speakers, etc. are arranged so as to overlap, sound penetration is poor and sound quality deteriorates, and the printed wiring board vibrates due to sound pressure and mechanical vibration of the mechanical parts. There is also the problem that vibration, howling, noise, etc. are likely to occur.

Furthermore, the tuner circuit of the radio receiving section configured on the printed wiring board is susceptible to the influence of magnetic flux from the magnet provided in the speaker body, which tends to cause changes in characteristics or misalignment of the tuner circuit.

Furthermore, in addition to the installation of various mechanical parts as described above, safety measures for the high voltage portion of the AC power supply section have recently become non-negligible.

Therefore, conventionally, various mechanical parts, printed wiring boards, etc. can be organically arranged and reliably installed inside the cabinet without the above-mentioned problems, and it has excellent assembly workability and is economically advantageous. There is a strong desire to develop a certain attachment mechanism.

This invention was made based on the above-mentioned circumstances, and the purpose is to provide an extremely good mounting mechanism for a power supply unit that can reliably take safety measures to prevent electric shock accidents and the like with a simple configuration.

Hereinafter, an embodiment in which this invention is applied to a two-way stereo type cassette tape recorder with a radio will be described in detail with reference to the drawings.

First, the basic configuration of the above-mentioned cassette tape recorder with radio will be schematically explained.

Fig. 1 shows a state in which the front cabinet 12 is removed from the rear cabinet 11 of a cassette tape recorder with a radio, and all of the main mechanisms for operation of this cassette tape recorder with a radio are located in the rear cabinet 11.
It is located at 1.

That is, a mechanism section 13 of a cassette tape recorder is disposed approximately in the center of a substantially box-shaped rear cabinet 11 with an open front surface.

This mechanism section 13 is attached to the protruding end portions of a plurality of mechanism section support columns 14 protruding from the rear plate 11a of the rear cabinet 11, for example, by screws (not shown) or the like.

Reference numeral 13a is an operation section for setting the mechanism section 13 into a predetermined operating state or a stopped state; 13b and 13c are respectively an erasing head and a recording/playback head; 13d is a capstan;
13e is a pinch roller, 13f.

13g is a reel shaft, 13h is a drive motor, 13i is a tape counter, and 13j is a reset button for the tape counter 131.

Here, a bass speaker body 15, 16 and a treble speaker body 17, 18 are arranged on both the left and right sides of the arrangement position of the mechanism section 13, separated by a predetermined distance.

Furthermore, a printed wiring board 19 and a dial board 20 for indicating the receiving frequency are disposed at the upper part of the rear cabinet 11 in the figure.

This dial board 20 is attached to the printed wiring board 19 via a mounting member that is not visible in FIG. A pointer 22 or the like is provided which slides on the top of the pointer 20 to indicate the receiving frequency.

Further, on the lower surface of the printed wiring board 19 in the figure, an operating device 23 is provided for various operations of the cassette tape recorder with radio.
26, etc. are provided.

Furthermore, microphones 27 and 28 are arranged on both sides of the printed wiring board 19.

Further, a Rondo antenna 29 is supported on the top plate 11b of the rear cabinet 11 so as to be rotatable in any direction, and between the upper ends of the side plates 11c and lld of the rear cabinet 11, there is a substantially U-shaped front panel. A carrying bundle 30 is installed and is rotatable in the directions of arrows A and B shown in the figure.

Here, the front cabinet 1 is combined with the rear cabinet in which various mechanical parts are arranged as described above, and the front cabinet 12 will be described next.

That is, a cassette lid 31 in which a tape cassette (not shown) is housed is provided approximately in the center of the front cabinet (2).

An insertion hole 32 for the operation section 13a of the mechanism section 13 is formed in the lower part of the cassette lid 31 in the drawing.

Further, a tape counter 13i is provided above the cassette lid 31.
The window 33 for displaying the scale and the insertion hole 3 of the reset button 13j.
4 is formed.

Further, housing portions 35 and 36 are formed on both sides of the cassette lid 31 to accommodate the bass speaker body 15, the treble speaker body 17, the bass speaker body 16, and the treble speaker body 18, respectively.

The housing portions 35 and 36 include the bass speaker body 1.
5. Treble speaker body 17 and bass speaker body 1
6. Nets 37, 38 and 39, 40 are provided at positions corresponding to the treble speaker body 18, respectively.

Further, the front upper end of the front cabinet 12 is inclined as shown in the figure, and the dial plate 20 is attached to this inclined part 41.
A display window 42, an insertion hole 43 for a rotating shaft (not shown) of the channel selection dial 21, ventilation holes 44, 45 for microphones 27, 28, etc. are formed.

Furthermore, operating shaft insertion holes 46 to 49 for the operating devices 23 to 26 are formed below the inclined portion 41.

By combining the front cabinet 12 and rear cabinet 11 as described above, a cassette tape recorder with radio is completed.

Now, to explain the installation of the printed wiring board 19, as shown in FIG. Horizontal guide groove 5
0at50b is formed.

Furthermore, a window 51 for a jack plate (not shown) is formed approximately in the center of the rear plate 11a of the rear cabinet 11.

On the other hand, at one end of the printed wiring board 19, the dial plate 2
0 is approximately perpendicular to the surface of the printed wiring board 19,
It is attached by a mounting member 52.

The length of this printed wiring board 19 is made shorter than the distance between guide grooves 50a and 50b formed on both side plates 11c and lld of the rear cabinet.

Fitting pieces 52a and 52b formed on the mounting member 52 and extending from both longitudinal ends of the printed wiring board 19 (
52b is not visible in FIG. 2) are the guide grooves 50a, 5.
0b, the printed wiring board 19
is attached to the upper part of the rear cabinet 11.

Therefore, according to the basic configuration as described above, the mechanism section 1
3. The bass speaker bodies 15 and 16, the treble speaker bodies 17 and 18, the printed wiring board 19, the dial board 20, the microphones 27 and 28, etc. are arranged on the back cabinet so that they do not overlap each other, so that various There are no restrictions on the order in which mechanical parts are attached, and the efficiency of assembly work can be improved.

Further, when repairing and inspecting the printed wiring board 19, there is no need to remove the mechanism section 13, the bass speaker body 15, 16, the treble speaker body 17, 18, etc., which is extremely convenient.

Furthermore, since the mechanism section 13, the bass speaker body 15.16, and the treble speaker body 17.18 are arranged so as not to overlap the printed wiring board 19, sound penetration is improved, and the sound pressure and mechanism Mechanical vibrations of the portion 13 are transmitted to the printed wiring board 19, thereby preventing the occurrence of chattering, knocking, etc.

Further, the tuner circuit of the radio receiving section configured on the printed wiring board 19 is connected to the bass and treble speaker bodies 15 to 1.
This also makes it less susceptible to the adverse effects of the magnetic flux from the magnet provided at 8.

Next, a description will be given of the power supply section, which is a feature of this invention.

That is, in FIG. 3, 75 is an AC jack, which is attached to one end of a printed wiring board 76.

A transformer 77 is attached to approximately the center of the printed wiring board 76, and a pair of spring electrodes 78aw78b are attached to the other end of the printed wiring board 76.

This printed wiring board 76 is arranged in parallel to the rear plate 11a of the rear cabinet 11.

That is, first, the printed wiring board 76 is connected to its spring electrode 7.
8 at 78 b are inserted into the through holes 66 at 66 b formed at one end of the battery storage portion 66, respectively.

Grooves are formed in the end faces of the through holes 66a, 66b, and the spring electrodes 78a.

78b is held.

Then, the end of the side where the AC jack 75 is attached is inserted into the rear plate 11a along the guide portion 79 formed on the side plate 11c.
Press rotationally in the direction.

Here, a plurality of (four in the illustrated case) bosses 80a to 80d are formed on the rear plate 11a, and the transformer 77
, the printed wiring board 76 is aligned with the bosses 80a to 80d by screws 81.

A window 82 is formed in the side plate 11c corresponding to the AC jack 75.

Here, as shown in FIG. 4, the side plate 11c and the rear plate 11a
A substantially U-shaped protection portion 83 is formed at the connection portion with the.

As shown in FIG. 5, with the printed wiring board 76 attached to the rear plate 11a with the screws 81, the soldered portion 84 between the AC jack 75 and the printed wiring board 76 is connected to the protective portion 8.
completely surrounded by 3.

Here, the cassette tape recorder with radio is
When operating from a power supply, connect the AC plug (not shown) to A.
It is sufficient to insert it into the C jack 75, and when operating with a dry cell, a dry cell (not shown) may be stored in the battery storage section 66.

At this time, the negative end of the dry battery is brought into contact with the spring electrodes 78a, 78b.

Furthermore, as shown in FIG.
It is connected to the soldered part 84 of the AC jack 75 in the AC jack 3 .

Therefore, according to the above-described power supply section, the soldering section 84 to which high voltage is applied is surrounded by the protection section 83, so that, for example, the front cabinet (■) must be removed from the rear cabinet 11 to perform internal inspection or repair. This can prevent your hand or the like from accidentally touching the soldering part 84 in case of a soldering part 84.

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 described in detail above, according to this invention, it is possible to provide an extremely good mounting mechanism for a power supply section that can reliably take safety measures to prevent accidents such as electric shock with a simple configuration.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view showing the basic configuration of a cassette tape recorder with radio to which this invention is applied, Figure 2 is an exploded perspective view showing the mounting mechanism of the printed wiring board to the rear cabinet, and Figure 3 is an exploded perspective view of the invention. FIGS. 4 and 5 are an exploded perspective view showing an example of the attachment mechanism of the power supply unit according to the embodiment, and FIGS. 4 and 5 are a perspective view and a side sectional view, respectively, for explaining details of the attachment mechanism of the power supply unit to the rear cabinet. . 11 **ss・e back cabinet, 12...
・Front cabinet, 13... Mechanism section, 14.
... Mechanism support column, 15.16 ... Bass speaker main body, 17.18 ... High sound speaker main body, 19 ... Printed wiring board, 20...
... Dial board 1.21 ... Tuning dial,
22... Pointer, 23 to 26... Operating device, 27.28... Microphone, 29...
...Medium Rad antenna, 30...Carrying handle, 31...Cassette lid, 32...
・Through hole, 33...Window, 34...Through hole, 35.36...Accommodating part, 37 to 40...
...Net, 41...Slope part, 42...
... window, 43 ... insertion hole, 44, 45 ...
...Vent holes, 46 to 49...Operation shaft insertion holes, 50a, 50b...Guide grooves, 51...
・Window, 52...Mounting member, 75...-A
C jack, 76...Printed wiring board, 77...
...Transformer, 78a, 78b...Spring electrode, 66...Battery compartment, 79...
Guide portion, 80a to 80d...Boss, 81.
...Screw, 82...Window, 83...
・Protective part, 84... Soldering part.

Claims (1)

[Scope of utility model registration request] In a power supply unit mounting mechanism in which a printed wiring board to which an AC jack and a transformer are attached is arranged side by side on the inner wall of one side plate of the cabinet body, the circuit pattern portion of the printed wiring board is covered with the inner wall of one side plate of the cabinet body. A mounting mechanism for a power supply unit, characterized in that a frame-shaped protection unit is formed in close contact with the power supply unit.