JPS605647Y2 - radio receiver - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a radio receiver that performs tuning using a rotary variable capacitor.

BACKGROUND ART AND PROBLEMS A rotating body called a dial drum or the like is attached to the rotating shaft of a tuning variable capacitor in order to rotate the rotating shaft.

These variable capacitors and dial drums are often attached to the printed circuit board so that their rotational axes are substantially perpendicular to the printed circuit board.

However, compared to other electrical components such as resistors and transistors that are attached to the printed circuit board, variable capacitors and dial drums are relatively large, and moreover, they are attached to the printed circuit board in series rather than in parallel.

For this reason, the overall thickness of the printed circuit board to which these parts are attached is thicker than the overall thickness of the parts to which other parts are attached.

Therefore, the cabinet that houses the printed circuit board inevitably becomes thicker, and there is a problem in that a thin radio receiver cannot be provided.

In order to make the radio receiver thinner, it is possible to make the cabinet thinner.

However, the cabinet is made so that it can be easily molded into the shape of the lumbar vertebrae.
They are often made of synthetic resin, and if they are made too thin, there will be problems with mechanical strength.

Purpose of the invention In view of the above-mentioned problems, the present invention is a radio receiver that is thin and has high mechanical strength, even though the cabinet is made of synthetic resin so that it can be easily molded into various shapes. The purpose is to provide an opportunity.

Summary of the invention The present invention provides a cabinet having at least a portion of a two-layer structure consisting of a metal plate on the outside and a synthetic resin base on the inside; a cutout closed by a board; a printed circuit board disposed within the cabinet and extending substantially parallel to a predetermined surface of the cabinet; and a rotating shaft attached to the printed circuit board with respect to the printed circuit board. A radio receiver comprising a tuning variable capacitor extending substantially vertically, and a rotating body attached to the rotating shaft for rotating the rotating shaft and at least partially housed in the cutout. It is related to the machine.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 shows the front side of the cabinet of the radio receiver 1, and the cabinet body 11 made of synthetic resin includes a small hole 2 for speaker sound emission, a volume adjustment knob 3, a sound quality selection knob 4, a frequency Selection knob 5, 6. 7, a shortwave frequency selection knob 8, a tuning knob 9, a rod antenna 10, etc. are provided, respectively.

Figures 2 to 4 show the back side of the cabinet.
Along the entire lateral direction of the cabinet body 11,
A machine nameplate 12 that also has an electrostatic shielding function is attached.

The cabinet body 11 is provided with a recess 13 into which a machine name plate 12 is fitted, and the machine name plate 12 is adhesively fixed in the recess 13 with a suitable adhesive.

The machine nameplate 12 itself is made of metal, for example aluminum, which exhibits a good shielding effect, and on its surface are printed letters, symbols, and numbers indicating the model, etc., as well as a world map and time as a world time reference table. There is.

On the other hand, on the side of the cabinet body 11, there is a sound emitting opening 1 for guiding sound from a speaker (not shown) to the rear side.
4. Openings 17 and 18 are provided for accommodating mounting parts of the printed circuit board 15 (for example, component leads and dial drum 16 of the variable capacitor 21) inside the cabinet body 11, and an opening 19 is provided to ensure a sufficient electrostatic shielding effect. It is being

Also, on the machine nameplate 12 side, a large number of sound emitting openings 20 corresponding to the sound emitting openings 14 of the cabinet 11 are provided.

That is, the back side of the cabinet of the radio receiver 1 has a two-layer structure in which the outer and inner sides are formed by the machine nameplate 12, which is a metal plate, and the cabinet body 11, which is a synthetic resin base, respectively.

Of the openings 14, 17, 18, and 19 formed in the cabinet body 11 of this two-layer structure, the other openings 17, 18, and 19 except for the sound emitting opening 14 are located on the machine nameplate 1.
2 are all blocked.

As clearly shown in FIGS. 5 and 6, the printed circuit board 15 is located inside the machine nameplate 12 and is fixed within the cabinet body 11 in a state substantially parallel to and close to the machine nameplate 12.

A tuning variable capacitor 21 is attached to the mounting surface of the printed circuit board 15, that is, the surface opposite to the machine nameplate 12, and its rotating shaft 27 passes through the printed circuit board 15 substantially perpendicularly.

A dial drum 16, which is a rotating body for rotating the rotary shaft 27, is attached to the tip of the rotary shaft 27. It is housed inside the machine at a position slightly away from the machine nameplate 12.

In this case, it is desirable that the machine nameplate 12 be located at the same position as the printed circuit board 15.

Further, a dial thread (not shown) extending from the tuning knob 9 is wrapped around the dial drum 16, so that when the tuning knob 9 is rotated, the rotating shaft 27 is rotated.

Note that the dial thread (not shown) extending from the tuning knob 9 can be connected to a notch (not shown) or a thin wall part (not shown) formed in the cabinet body 11 so as to be connected to the opening 18. In the evening, it passes through the eardrum 16.

In FIG. 4, a recess 25 provided inside the cabinet body 11 has a grounding plate spring 22 as shown in FIG.
is fitted in and fixed with an appropriate method (for example, adhesive tape), and when the machine nameplate 12 is attached to the cabinet body 11, the tip 23 of the leaf spring 22 due to its own elasticity.
．． 26 is the earth pattern 24 provided on the printed circuit board 15
and is configured to be elastically pressed against the nameplate 12.

Application Example Although the present invention has been described above based on one embodiment, it will be understood that the present invention is not limited to this embodiment and can be modified in various ways.

For example, in the above embodiment, the cabinet body 1
Although the opening 18 formed through the cabinet body 1 is used as a cutout for accommodating the dial drum 16, it is also possible to form a cutout on the edge of the cabinet body 11 and use this cutout as the above-mentioned cutout. .

Further, in the above embodiment, substantially the entire dial drum 16 is accommodated within the opening 18, but the dial thread (
When the hook (not shown) is placed outside the opening 18, a notch (not shown) for passing the dial thread (not shown), a thin wall part (not shown), etc. No need to form.

Effects of the invention As described above, the radio receiver according to the invention has at least a part of the cabinet a two-layer structure consisting of a metal plate and a synthetic resin base, and a cutout is formed in the synthetic resin base of the two-layer structure. However, at least a part of the rotating body attached to the rotating shaft of the tuning variable capacitor is housed in the cutout.

Therefore, only the rotating body is absorbed into the thickness of the synthetic resin base,
There is no need to make the synthetic resin base thin, and the cutout where the rotating body is housed is closed with a metal plate with high mechanical strength, so synthetic resin is used so that it can be easily molded into various shapes. Although the cabinet is formed by
It is possible to provide a radio receiver that is thin and has high mechanical strength.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a perspective view of the front side of the radio receiver, and Fig. 2 is a perspective view of the radio receiver shown in Fig. 1 with the metal plate separated from the back side. Fig. 3 is a rear view of the radio receiver shown in Fig. 1, Fig. 4 is a plan view of the back cover of the radio receiver cabinet shown in Fig. 1 seen from inside, and Fig. 5 is an exploded perspective view of the state. 3, FIG. 6 is a sectional view taken along line VT-VI in FIG. 3, and FIG. 7 is a perspective view of a metal plate earthing plate spring. In addition, in the symbols used in the drawings, 1...
・Radio receiver, 11...cabinet body,
12... Machine nameplate, 15... Printed circuit board, 16... Dial drum, 18...
・Opening, 21... Variable capacitor, 27...
It is the axis of rotation.

Claims (1)

[Scope of utility model registration request] A cabinet having at least a part of a two-layer structure with a metal plate on the outside and a synthetic resin base on the inside, and a cabinet formed on the synthetic resin base of the two-layer structure part and closed by the metal plate. a cutout portion, a printed circuit board disposed within the cabinet and extending substantially parallel to a predetermined surface of the cabinet, and a rotating shaft attached to the printed circuit board extending substantially perpendicular to the printed circuit board. A radio receiver comprising a variable capacitor for tuning, and a rotary body attached to the rotary shaft for rotating the rotary shaft and at least a part of which is housed in the cutout.