JPH0126151Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to audio equipment such as tape recorders, and particularly to a shielding device.

Generally, the electric circuit section of an audio device such as a tape recorder is shielded, and the common method is to fix a shield plate made of aluminum foil or the like to a printed wiring board with screws. In order to check the electric circuit in audio equipment equipped with such shielding, it is necessary to first disassemble the cabinet that makes up the audio equipment and then remove the shield plate from the printed wiring board using a screwdriver, which is very inconvenient. .

The present invention has been developed in view of these points, and will be described in detail below with reference to the drawings. The drawings all relate to the shield device of the present invention; FIG. 1 is an exploded perspective view, and FIG. 2 is a side sectional view of the main parts. In the figure, numerals 1 and 2 are first and second cabinets constituting the main body of the tape recorder, and numeral 3 is a knob for switching the operation of the tape recorder.
Reference numeral 4 designates a fixed base plate which is fixed to the first cabinet 1 and has a tape recorder drive mechanism attached thereto, and 5 represents a first mounting post formed on the fixed base plate 4, in which a screw hole 6 is formed. ing. Reference numeral 7 denotes a second mounting post formed at a position facing the first mounting post 5 of the second cabinet 2, and has a screw hole 8 formed therein. 9
is a printed wiring board on which electrical circuit components (not shown) are mounted, and is fixed to the fixed board 4 and is attached to the first mounting board when the first cabinet 1 and the second cabinet 2 are combined with screws 10. It is arranged so as to be sandwiched between the post 5 and the second mounting post 7, and is provided with a grounding pattern 11. 12 is a shield plate made of aluminum foil or the like attached to the surface 2a of the second cabinet 2 facing the printed wiring board 9; 13 is an insulating sheet made of Mylar or the like attached to cover the shield plate 12; 14 is a coil spring arranged to be wound around the second mounting post 7 formed on the second cabinet 2, and one end 14a of which is clamped and fixed by the shield plate 12 and the insulating sheet 13; Constructed of conductive material.

In such a configuration, the assembly is performed as follows. After fixing the fixed board 4 on which the operating knob 3 and the drive mechanism are attached to the first cabinet 1, the printed wiring board 9 is fixed to the fixed board 4.
Further, after attaching the shield plate 12 to the surface 2a of the second cabinet 2 facing the printed wiring board 9,
An insulating sheet 13 is attached to cover the shield plate 12, and one end 14 of the coil spring 14 is attached at that time.
A is inserted between the shield plate 12 and the insulating sheet 13. As a result, the coil spring 14 is fixed to the surface 2a of the second cabinet 2 by the shield plate 12 and the insulating sheet 13. After such assembly, the second cabinet 2 is combined with the first cabinet 1, and the screws 1
By tightening the bolt 0, assembly of the tape recorder is completed. the first cabinet 1 and the second
When the coil spring 14 is combined with the cabinet 2, the tip end 14b of the coil spring 14 is in contact with the ground pattern 11 provided on the printed wiring board 9. Therefore, the shield plate 12 attached to the second cabinet 2 is connected to the coil spring 1.
4, it is electrically connected to the ground pattern 11 of the printed wiring board 9, and acts as a shield plate.

In this embodiment, a case has been described in which the present invention is applied to a tape recorder, but it can also be applied to other audio equipment such as a radio receiver. Further, in this embodiment, the second mounting post 7 is formed on the second cabinet 2 and the coil spring 14 is arranged to be wound around the post 7, but there is no problem even if the mounting post 7 is not provided.

As explained above, the shielding device of the present invention is used in an audio device in which a cabinet main body is constructed by combining a first and a second cabinet, in which a printed wiring board is provided in the first cabinet, and a printed wiring board is provided in the first cabinet. By attaching a shield plate to the second cabinet and combining the first and second cabinets, the shield plate and the ground pattern of the printed wiring board are electrically connected. When opened, the shield plate is inevitably separated from the printed wiring board, making it easy to check the electrical circuit. Furthermore, since the biasing force of the coil spring acts between the first and second cabinets, the present invention has the advantage that it is possible to prevent the generation of abnormal noises, so-called chattering sounds, which are generated by the cabinets due to the sound emitted from the speakers. are doing. Furthermore, since the coil spring is fixed to the second cabinet not by screws or soldering but by the clamping force between the shield plate and the insulating sheet, installation can be easily carried out, and the present invention has an ultra-compact design. It is ideal as a shielding device for audio equipment.

[Brief explanation of the drawing]

The drawings all relate to the shielding device of the present invention; FIG. 1 is an exploded perspective view of the main parts, and FIG. 2 is a side sectional view of the main parts. Explanation of main drawing numbers, 1...1st cabinet, 2
...Second cabinet, 4...Fixed board, 9...
Printed wiring board, 11... Ground pattern, 12...
Shield plate, 13...insulation sheet, 14...coil spring.

Claims (1)

[Scope of utility model registration request] In an audio device in which a cabinet main body is constructed by combining a first and a second cabinet, a printed wiring board mounted with an electric circuit component and disposed on the first cabinet side; a shield plate attached to a surface of the cabinet facing the printed wiring board; an insulating sheet attached to cover the shield plate;
It consists of a coil spring, one end of which is fixed between the shield plate and the insulating sheet, and the other end of which is arranged to face the printed wiring board, and when the first and second cabinets are combined, the coil spring A shield device for an audio device, characterized in that the shield plate is brought into elastic contact with a ground pattern formed on the printed wiring board, thereby electrically connecting the ground pattern of the printed wiring board and the shield plate.