JPH10270885A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform specified adjustment work for adjusting parts of board housed in a shield cover without providing an opening in the shield cover. SOLUTION: A circuit board 10 is provided with a plurality of adjusting volumes 14a to 14d to adjust the volume of recording signal on its rear surface. A shield cover 12 is formed as a box to house the circuit board 10, and it consists of rear surface 12a, upper surface 12b, left side surface 12c, right side surface 12d, and lower surface 12e. Then, the rear surface 12a facing the circuit board 10 is provided with a first slit 18 extending in horizontal direction and a second slit 19 extending in vertical direction. When a movable part 20A formed on the slits 18 and 19 is turned on connection parts 21 and 22 as a hinge, the upper surface 12b covering the upper side of the circuit board 10 is displaced aside, so that the adjusting volumes 14a to 14d mounted on the upper side of the circuit board are exposed and they can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device, and more particularly, to an electronic device provided with a shield cover for shielding electronic components from the outside.

[0002]

2. Description of the Related Art In general, in an electronic device in which a plurality of electronic parts are incorporated, a shield for covering the periphery of the circuit board with a shield cover in order to protect the electronic parts mounted on the circuit board from the influence of external magnetic or electromagnetic waves. Structure is used. In such a shield structure, the shield cover is attached in the assembly process, and it is necessary to perform adjustment work such as turning the knob of the adjustment volume provided on the circuit board in the subsequent inspection process. An opening for adjustment work was provided. When the adjustment work is completed, another shield plate is screwed to the shield cover to cover the adjustment work opening.

[0003]

However, as in the conventional configuration, an opening for adjustment work is provided in the shield cover, and after the adjustment work, another shield plate is screwed to the shield cover to close the opening for adjustment work. In addition, since it is necessary to manufacture a shield plate separate from the shield cover, there is a problem that the number of parts increases accordingly.

[0004] In addition, since the conventional one also requires an assembling operation such as screwing the shield plate, it is difficult to improve the operation efficiency by that amount, and the manufacturing cost is high. Therefore, an object of the present invention is to provide an electronic device that has solved the above-mentioned problems.

[0005]

According to the present invention, there is provided an electronic component having an adjusting mechanism having an adjusting mechanism.
A shield cover provided to cover the electronic component, and a shield cover for shielding the electronic component from the outside, wherein a slit is formed around a cover portion of the shield cover that covers the electronic component with the adjusting mechanism. The cover portion is displaceable by using a connection portion excluding the slit as a hinge, and after adjusting the adjustment mechanism of the electronic component with the adjusting mechanism, returning the cover portion to a position covering the electronic component with the adjusting mechanism. It is characterized by the following.

Therefore, according to the present invention, the cover portion can be displaced by using the connection portion excluding the slit as a hinge and the adjustment mechanism of the electronic component with the adjusting mechanism is adjusted, and then the cover portion is covered with the position for covering the electronic component with the adjusting mechanism. This eliminates the need to manufacture a shield cover and a separate shield plate as in the past, thus reducing the number of parts and reducing the assembly labor and manufacturing cost. It becomes possible.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an embodiment of an electronic device according to the present invention, and FIG. 2 is an exploded perspective view showing an enlarged main part of the present invention. The electronic device 1 is a digital multi-track recorder, and generally includes a main body 2, a recording / reproducing unit 3 mounted on the main body 2, a front panel 4 mounted on a front surface of the main body 2, an upper surface of the main body 2, It comprises a cover 5 that covers both side surfaces. The main body 2 is provided with a circuit storage section 6 in which circuit boards such as a control circuit and a power supply circuit are stored, and a recording / reproducing unit mounting section 7 to which the recording / reproducing unit 3 is screwed.

The front panel 4 is provided with knobs and knobs of various operation switches, and is provided with a cassette insertion slot 8 to be inserted into the recording / reproducing unit 3. Then, the recording / reproducing unit 3 is connected to the cassette insertion port 8.
When a tape cassette (not shown) is loaded from the tape cassette, a tape loading operation for pulling out a magnetic tape in the tape cassette is performed, and then a magnetic recording or reproducing operation is performed.

The recording / reproducing unit 3 includes a drum 9 on which a magnetic tape is spirally wound by a tape loading operation to rotate a magnetic head, a bracket 11 on which a circuit board 10 is mounted, and a cover for covering the circuit board 10. Cover 1 attached to bracket 11
And 2. The circuit board 10 includes an amplifier circuit for amplifying a reproduction signal output from the magnetic head, a circuit for supplying a recording signal to the magnetic head, and the like.

As shown in FIG. 2, the bracket 11 has a mounting portion 11a screwed to the recording / reproducing unit 3 and a flexible wiring board 13 connected to the recording / reproducing unit 3.
And a concave portion 11b for inserting the same. The circuit board 10 has a plurality of adjustment volumes (electronic components with an adjustment mechanism) 14 for adjusting the volume of the recording signal on the back surface.
a to 14d are provided, and a first connector 15 to which the flexible wiring board 13 is connected is provided above the surface. A second connector 17 to which the flexible wiring board 16 is connected is provided below the surface of the circuit board 10.

The shield cover 12 includes a back surface 12a facing the surface of the circuit board 10, an upper surface 12b covering the upper side of the circuit board 10, and a left side surface 12c covering the left side of the circuit board 10.
And a right side surface 12d covering the right side of the circuit board 10 and a lower surface 12e covering the lower side of the circuit board 10. In addition, the shield cover 12 is provided so that the circuit board 10 can be stored therein.
It is formed by bending two tin plates into a box shape,
Upper surface 12b, left side surface 12c, right side surface 12d, lower surface 12e
The corners formed by are only releasably butted. The first slit 1 extending in the horizontal direction is formed on the back surface 12 a facing the circuit board 10.
8 and a second slit 19 extending vertically.

The first slit 18 and the second slit 1
The slit width of No. 9 is set to a small size so as to minimize the shield leakage. Therefore, slit 1
8 and 19 are provided so that the shielding performance of the shield cover 12 does not deteriorate. In addition, the first slit 18
The right end 18a extends to the right side surface 12d, and the left end 18b extends to just before the second slit 19. The upper end 19a of the second slit 19 has the upper surface 1a.
2b, and the lower end 19b is the first slit 18
Extend to a position close to the end 18b of the first portion.

As shown in FIG. 3, a portion surrounded by the first slit 18 and the second slit 19 is formed so as to cover a plurality of adjustment volumes 14a to 14d attached to the circuit board 10 together with the upper surface 12b. Movable part 20A
Is formed. Then, the movable portion 20 of the rear surface 12a
The portion excluding A functions as the fixed portion 20B. The right end of the movable portion 20A is supported on the right side surface 12d via a pair of connecting portions 21 and 22, and the left end of the movable portion 20A is connected to a pair of connection portions formed at both ends of the second slit 19. The fixing portion 20B of the shield cover 12 via the portions 23 and 24
It is supported by.

The movable portion 20A thus formed is provided so that the connecting portions 21 and 22 with the right side surface 12d function as hinges so that the movable portion 20A can be rotated in the horizontal direction. If the movable portion 20A fluctuates before assembling, an unnecessary load is applied to the connection portions 21 and 22. Therefore, the movable portion 20A has a left end portion at the end portion 18b of the first slit 18.
Connecting portion 23 formed between the lower end 19b of the second slit 19 and the upper end 19a of the second slit 19 and the upper surface 12
b, and is supported in a state where rattling is prevented by the connecting portion 24 formed between the connecting portion 24 and the connecting portion 24. That is, the movable portion 20A before assembly has four connecting portions 21 to 2 on the left and right sides.
4 stably holds.

A third slit 25 is provided between the connecting portions 21 and 22, and a fourth slit 26 is provided on the left side of the corner between the upper surface 12b and the rear surface 12a. The shield cover 12 includes a left side surface 12c and a right side surface 1c.
At the end of 2d, a mounting portion 12f screwed to the bracket 11 projects on both sides. An opening 12g through which the flexible wiring board 16 is inserted is provided in the lower surface 12e.

Further, the circuit board 10 is fixed by soldering while being in contact with a plurality of contact portions 27 provided on the left side surface 12c, the right side surface 12d, and the lower surface 12e of the shield cover 12. The plurality of contact portions 27 are triangular protrusions cut and raised from the outside to the inside.
The circuit board 10 is provided so as to be in contact with the periphery of the “0” and to hold the circuit board 10 substantially at the center of the internal space of the shield cover 12.

Here, the adjustment operation after the bracket 11 is attached to the shield cover 12 configured as described above will be described. The shield cover 12 is fixed to the bracket 11 in a state where the circuit board 10 is housed therein, and is attached to the rear of the recording / reproducing unit 3. afterwards,
In the inspection process, adjustment work of the adjustment volumes 14a to 14d is performed.

At this time, of the four connection portions 21 to 24 supporting the movable portion 20A, the left connection portions 23 and 24 located at both ends of the second slit 19 are cut by a tool such as a nipper. Thereby, the movable portion 20A is connected to the right connecting portion 2.
The first and second hinges can be turned in the horizontal direction as hinges. FIG. 4 shows that the movable part 20A is connected to the right connection parts 21 and
It is a top view showing the state where 2 was rotated as a hinge.

When the movable portion 20A is displaced in the direction A around the connecting portions 21 and 22, the upper surface 12b covering the upper portion of the circuit board 10 is shifted laterally. 14a to 14d and connector 1
5 is exposed. After the flexible wiring board 13 is inserted into the connector 15, the adjustment volumes 14a to 14d
Turn the knob to adjust the volume of each channel. Thus, the adjustment volumes 14a to 1
When the adjustment operation of 4d is completed, the movable portion 20A is rotated and displaced in the direction B around the right connection portions 21 and 22 to return to the position before the rotation operation.

As a result, the adjustment volumes 14a to 14
The upper part of d is covered with the upper surface 12b. The mounting portion 28 protruding from the upper surface 12b is
It is screwed to the first mounting portion 11a. Therefore, the movable portion 20 </ b> A has the right side supported by the connection portions 21 and 22, and the left side fixed to the mounting portion 11 a of the bracket 11 by screws.

As described above, the shield cover 12 exposes the adjustment volumes 14a to 14d by rotating the right connecting portions 21 and 22 of the movable portion 20A as hinges when adjusting the adjustment volumes 14a to 14d. After the adjustment of the adjustment volumes 14a to 14d is completed,
Since the movable portion 20A can be returned to the position before the rotation, there is no need to provide a volume adjusting opening as in the related art. Therefore, it is not necessary to manufacture a shield plate separate from the shield cover 12 as in the related art, and the number of parts can be reduced by that much, and the labor for assembly work can be reduced and the manufacturing cost can be reduced.

Further, in this embodiment, since the movable portion 20A can rotate the right connection portions 21 and 22 as hinges, there is no need to provide a hinge, and the shield cover 12 is made of a single metal plate. It can be made, the number of parts can be reduced, and the manufacturing cost can be reduced.
In the above embodiment, the electronic device 1 is described as being constituted by a digital multi-track recorder. However, the present invention is not limited to this, and it goes without saying that the present invention can be applied to other devices.

It goes without saying that the adjusting mechanism may be other than the adjusting volumes 14a to 14d. Further, the slits 18 and 19 formed in the shield cover 12 are not limited to the shape of the above-described embodiment. For example, slits extending along the corners of the upper surface 12b and the rear surface 12a are provided so that the upper surface 12b is vertically moved. As a matter of course, the adjustment volumes 14a to 14d may be exposed by rotating.

[0024]

As described above, according to the present invention, the cover part can be displaced by using the connection part except the slit as a hinge, and after adjusting the adjustment mechanism of the electronic component with the adjustment mechanism, the cover part is moved to the electronic part with the adjustment mechanism. Since it is configured to return to the position to cover the parts, it is not necessary to manufacture a shield plate separate from the shield cover as in the past, and the number of parts can be reduced by that much, as well as the labor of assembly work is reduced and the manufacturing cost is reduced. Can be suppressed at low cost.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of an electronic device according to the present invention.

FIG. 2 is an exploded perspective view showing a main part of the present invention in an enlarged manner.

FIG. 3 is a rear view showing an attached state of a shield cover.

FIG. 4 is a plan view showing a state in which the movable part is rotated with the right connecting part as a hinge.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic device 2 Main body part 3 Recording / reproducing unit 4 Front panel 5 Cover 10 Circuit board 11 Bracket 12 Shield cover 12a Back surface 12b Upper surface 14a-14d Adjustment volume 18 1st slit 19 2nd slit 20A Movable part 20B Fixed part 21-24 Connection Department

Claims (1)

[Claims] 1. An electronic device, comprising: an electronic component with an adjusting mechanism having an adjusting mechanism; and a shield cover provided to cover the electronic component and shield the electronic component from the outside. A slit is provided around a cover portion that covers the electronic component with the adjusting mechanism, and the connecting portion excluding the slit is hinged so that the cover portion can be displaced. After adjusting the adjusting mechanism of the electronic component with the adjusting mechanism, An electronic device, wherein a cover portion is returned to a position covering the electronic component with an adjusting mechanism.