JPS631471Y2 - - Google Patents

Description

[Detailed explanation of the idea] This proposal concerns improvements to AM or FM receivers.

In the conventional receiver described above, an antenna is attached to the outer surface of, for example, the back plate of a hexahedral cabinet, and a circuit board connected to the antenna and forming the tuner section is attached to, for example, the inner surface of the bottom plate.

For this reason, the antenna is assembled separately on the rear panel, and the circuit board for the tuner section is assembled on the bottom panel, and these are connected using electric wires.This not only increases the number of assembly steps and parts, but also increases the number of parts required for the tuner section. At the time of inspection, the back plate and the bottom plate were connected to each other via electric wires and then separated, resulting in disadvantages such as tension being applied to the electric wires, which could cause them to break or get in the way.

This proposal was proposed in view of these points. An opening is provided in one side of the hexahedral cabinet, such as the back plate, and a removable lid is provided to cover this opening. A feature of the antenna is that the circuit board of the tuner section is attached to the inner surface of the antenna, and the antenna and the circuit board of the tuner section can be attached to and removed from the cabinet as one unit.

The present invention will be explained below along with an illustrated embodiment.

Figure 1 is a front view of a radio receiver attached to a cassette tape recording/playback device to which the present invention is applied, Figure 2 is its rear view, Figure 3 is an exploded perspective view showing its main parts, and Figure 4 is the radio. FIG. 3 is a partial circuit block diagram.

In FIGS. 1 to 3, a receiver cabinet 10 has a rectangular bottom plate 11 and a front plate 12 attached to the front surface of the bottom plate 11 so as to rise vertically upward.
, a back plate 13 similarly attached to the back of the bottom plate 11, and a U-shaped cross section with left and right side plates 1 at both ends.
4 and 15, and a lid plate whose central portion constitutes an upper surface plate 16.

As shown in FIG. 1, the front plate 12 includes a cassette insertion section 18 into which a cassette tape of a tape recorder can be inserted and removed, and a control switch section 1 of the tape recorder.
9. Tape recorder, record player and AM
A display section including a switch section (function switch section) 20 for selecting a signal source such as FM, a section for displaying the receiving frequency of the AM and FM tuner section, a section 22 for displaying the type of tape of the tape recorder, etc. Volume operation unit 2 that controls the output amount of the receiver
3. It has a power switch section 24 and the like.

Inside the cassette insertion section 18, there is a known tape recorder section 25 comprising means for driving the cassette tape inserted into the insertion section 18, a head, and the like.

In the illustrated example, the reception frequency display section 21 uses a digital display that displays the reception frequency numerically because the tuner section employs a synthesizer method.

A chassis 26 and a first circuit board 27 (printed board) are attached to the inner surface of the bottom plate 11.

The back plate 13 has an opening 29 communicating with the upper end 28, and an output terminal section 31 for supplying signals to a power cord 30 and speakers, and an input terminal section for inputting signals from a signal source of a record player or other audio device. 3
It has 2.

The opening 29 is provided with a lid 33 having a slightly larger profile than the opening 29 so as to be able to close the opening 29.
A second circuit board 35 is attached to the inner surface of the lid 33 using a support plate 34. The above-mentioned digital display 21 is attached to the opposite side of the circuit board 35 from the lid 33.

A bar antenna 36 for AM is installed on the outer surface of the lid body 33.
and an antenna terminal section 37 to which an FM antenna is connected. The bar antenna 36 and the antenna terminal part 37 are connected to the circuit board 35 and the terminal 3 on the inner surface of the lid body 3.
8 and 39.

On the second circuit board 35, a tuner circuit section 44 consisting of a high frequency amplification circuit section 40, a frequency conversion circuit section 41, an intermediate frequency amplification circuit section 42, and a detection circuit 43 shown in FIG. 4 is assembled. Therefore, the low frequency amplifier circuit section 45, the power supply circuit section (not shown), and the circuit section of the tape recorder section 25 are assembled on the first circuit board 27.

A plurality of mounting holes 46 and 47 are provided between the peripheral edge of the lid body 33 and the peripheral edge of the opening 29 of the back plate 13, and one of the second circuit board 35
The two end portions 51 and the chassis 26a have a plurality of attachment holes 48 and 49 that can be fitted into each other. It can be attached and detached by using attachment members (not shown) such as screws between these attachment holes 46, 47 and 48, 49.

The frequency conversion circuit section 41 has a synthesizer circuit, and a digital display 2 that displays the received frequency.
1 is assembled.

This second circuit board 35 is assembled by attaching the lid 33 so as to close the opening 29 of the back plate 13, and
Insert screws into holes 6 and 47 and secure. Also, by mounting the end portion 51 of the circuit board 35 on the mounting piece 50 of the chassis 26 and fixing it by inserting screws into the mounting holes 48 and 49, the cabinet 10 is fixed.
It is removably installed inside the. Then, the digital display 21 is located on the display section 21 of the front plate 12.

Side plates 14 and 15 of the top plate 16 of the cabinet
is assembled last.

As described above, according to the present invention, an opening 29 is provided in one surface 13 of the back plate of the receiver cabinet 10, and the opening 29 is removably attached to this opening, and when installed in the opening, the opening 29 is closed. A lid body 33 is provided,
The circuit board 35 constituting the tuner section of the receiver is attached to the inner surface of the lid, and the antenna 36 connected to the circuit board 35 is attached to the outer surface of the lid. The circuit board 35 can be assembled integrally with the lid 33, and the lid 33 can be attached to the opening 2 during manufacturing and inspection.
It can be easily carried out by attaching and detaching it to 9, resulting in good workability. Further, the circuit board 35 can be arranged in two stages with the circuit board 27 attached to the inner surface of the bottom plate 11 of the cabinet 10, which has practical effects such as a compact structure.

[Brief explanation of drawings]

Fig. 1 is a front view of the cabinet of the present embodiment, Fig. 2 is a rear view thereof, and Fig. 3 shows the top plate and left and right side plates of the cabinet removed, and the cabinet and the circuit board of the tuner section disassembled. 4 is a block diagram showing the circuit configuration of the receiver 10. FIG. 10 is a cabinet, 13 is a back plate, 29 is an opening, 33 is a lid, 35 is a circuit board of the tuner section, and 36 is an antenna.

Claims (1)

[Scope of utility model registration request] An opening is provided on one surface of a hexahedral receiver cabinet, a lid is provided that is removably attached to the opening and closes the opening when attached to the opening, and the receiver is mounted on the inner surface of the lid. 1. A receiver comprising: a circuit board constituting a tuner section; and an antenna connected to the circuit board attached to the outer surface of the receiver.