JPH04176196A - Electronic component housing case - Google Patents

Abstract

PURPOSE:To enable a single grounding wire to cope with the grounding of an electronic component housing case and to completely fix the shielding member provided to the rear of a lid to a case main body by a method wherein a part of the shielding member fixed to the inner wall of the case main body is made to extend to the upper part of a fixed section, and the lid is screwed down to the case main body making the shielding members come into contact with each other at the extension. CONSTITUTION:A noise shielding iron plate 24 is provided to the base and each of the four inner walls of a housing section 16, a through-hole 26 is provided to each of the four corners of the iron plate 24 which serves as the base of the housing section so as to enable a fixed part 20 to be fitted into the housing section 16, and an extension 26 is provided so as to cover each of the upper parts of the ends of the side walls 24a of the iron plates 24 to the upside of the fixed part 20, and a hole is provided at the center of each of the extensions 26 to enable a screw 27 to be driven into it. A circuit board 14 is fixed to the rear of a lid 18, a grounding wire 30 is connected to an iron plate 28 and the circuit board 14, the lid 18 is made to cover the opening of the housing section 16, and the lid 18 and the housing section 16 are fixed to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electronic component storage case for storing electronic components such as circuit boards.

(Prior Art) A case that houses electronic components such as a circuit board has a noise shielding blocking member such as a steel plate installed inside the case in order to shield noise from the outside. As a structure for attaching this blocking member, there is, for example, a storage case 1.0 as shown in FIG.

This storage case 110 includes a case body 1j2 and a lid 114.
Therefore, an iron plate 116 is attached to the inner wall surface such as the bottom side wall of the case body 112 to block noise from the outside. Further, an iron plate 11g is attached to the back side of the lid 114 to block noise.

Ru. Then, when the case body 112 is covered with the lid 114, the inside of the case 10 is entirely surrounded by the iron plates 1, 18, 118, and the inside of the case 110 is blocked from noise from the outside.

(Problem to be Solved by the Invention) In the storage case 110 having the above configuration, the circuit board 120
When attaching to the lid 114, the potential of this circuit board and
Since it is necessary to make the potentials of the iron plates 1.1B and Ilg the same, it is necessary to connect the ground wires 122 and 124 to the iron plates 116 and 118, respectively, as shown in FIG.

In this case, since the ground wires 122 and 124 are connected to the case body 112 and the lid 114, respectively, the workability becomes complicated and the work becomes difficult.

In view of the above problems, the present invention provides an electronic component storage case in which the structure of the ground wire can be simplified.

[Structure of the Invention] (Means for Solving the Problems) The electronic component storage case of the present invention includes a case body in which a screw fixing part is provided inside, and a case body installed on the inner wall surface of the case body to block external noise. This electronic component storage case consists of a blocking member and a blocking member installed on the back side of the lid of the case body to block external noise, and the lid is fixed to the case body with screws. A part of the cutoff member is extended above the fixing part, and the case body and the lid are screwed together, so that both the reverse cutoff members are brought into contact with each other at the extended part.

(Function) With the electronic component storage case having the above configuration, when a circuit board is stored inside the storage case, the inner wall surface inside the storage case is entirely surrounded by the blocking part ta that blocks external noise. , this circuit board is protected from external noise.

In addition, if you want to make this circuit board and the cut-off member the same potential, attach the ground wire to either the cut-off member on the case body or the cut-off member attached to the back of the lid. Since the interrupting member and the interrupting member of the case body are in electrical contact through the extension portion, the ground wire may be connected to either one.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

In this embodiment, a case will be described in which the machine compartment 2 of a low-noise refrigerator 1 equipped with a silencing system employing so-called active control is mounted on the lid.

This refrigerator 1 has a one-dimensional duct structure whose cross-sectional dimension is sufficiently small compared to the wavelength of the noise to be reduced.
In the machine room 2 of a speaker 3 that emits control sound inside the machine room 2, and a speaker 3 that emits control sound inside the machine room 2
A heat dissipation opening 4 is provided in the wall surface of the machine room 2 in a direction substantially perpendicular to the direction of propagation of internal sound.

The noise of the compressor that is about to exit from the opening 4 of the machine room 2 is canceled out by the control sound.

In this case, this embodiment will explain a storage case for storing a control circuit for processing an output signal of a vibration pickup, that is, an electronic component constituting this control circuit.

Reference numeral 10 is a lid that is attached to the opening on the rear surface of the machine room 2 (see Fig. 4), and has a side wall 11 with an opening 4 on the - side and a side wall 11 on the other side. A speaker mounting section 12, which is a space for accommodating the speaker 3, is provided (see FIG. 2).

In addition, in the center of the lid 10, there is a storage part 16 which is a storage case for storing the circuit board 14 of the control circuit.
Or is provided. The storage section 16 has a rectangular box shape in plan view, and is formed deep enough to accommodate a circuit board j4 (see FIGS. 1 and 2).

Reference numeral 18 denotes a lid of the storage section 16, which is formed to close all openings on the upper surface of the storage section 16.

Reference numeral 20 denotes a fixing portion protruding from a corner of the bottom surface of the storage portion 16. These four fixing parts 20 have a cylindrical shape, and screw holes 22 are formed inside them.

Reference numeral 24 denotes iron plates for noise shielding attached to the bottom surface and four side walls of the storage section 16. This iron plate 24 is attached along each inner circumferential wall, and four through holes 26 are provided at the corners of the iron plate 24, which correspond to the bottom surface of the housing part 16, so that the fixing part 20 fits therein. Also,
The fixing portion 24
An extension part 26 is provided to cover the upper part of each of the parts. This extending portion 26 has a hole in the center so that a screw 27 can pass therethrough (see FIG. 3).

The first plate 28 is an iron plate attached to the back surface of the lid 18.

A circuit board 14 is attached to the back side of this iron plate 28.

Reference numeral 30 is a ground wire connected from the circuit board 14 to the iron plate 28 (see FIG. 1).

Reference numeral 32 is a connection line for connecting the circuit board I4 to the vibration pickup, and reference numeral 34 is a speaker line for connecting to the speaker 3.

The installation of the above-mentioned structure will be described based on FIGS. 1 to 3 for the case where the circuit board 14 is installed inside the storage portion 1G in the lid 10.

First, as described above, the circuit board J4 is attached to the back side of the lid 18, and the ground wire 30 is connected to the iron plate 28 and the circuit board 14 so that they have the same potential. Next, attach the lid 18 to the storage section 1.
Put a lid on the opening in step 6. In this case, the lid 18 is placed on the four fixing parts 20. As a result, the extending portion 26 and the iron plate 28 are electrically connected, so that the iron plate 24 and the iron plate 28 have the same potential. Then, by tightening the screws 27 at four places from above the lid 18, the lid 18 and the storage part 1 are fixed as shown in FIG.
6 is fixed.

In the storage section 10, the circuit board 14 is placed on the iron plate 24.
and an iron plate 28, shielding noise from the outside. Further, since the iron plate 24 and the iron plate 28 are electrically connected by the extension portion 26, only one ground wire 30 can be connected, improving the workability. Further, since the extending portion 26 is provided on the upper part of the fixing portion 20, the iron plate 28 is completely fixed to the storage portion 16 by screwing.

In the above embodiment, the structure of the storage section 16 in the lid 10 was described for mounting a refrigerator using active control, but the present invention can be used in other electronic component storage cases regardless of this.

[Effects of the Invention] As described above, with the electronic component storage case of the present invention, when a circuit board is stored inside the storage case and a ground wire is attached, either the cutoff member of the case body or the cutoff member of the lid is attached. If a ground wire is attached only to the extended portion, both cut-off portion shrines are electrically connected, so only one ground wire connection is required.

In addition, by screwing the case body and lid together,
It is completely fixed to the blocking member on the back of the lid or to the case body.

[Brief explanation of the drawing]

FIG. 1 is a partially enlarged longitudinal cross-sectional view of a storage case showing an embodiment of the present invention, FIG. FIG. 4 is a perspective view of the back side of the low-noise refrigerator; FIG. 5 is a vertical sectional view of a conventional electronic component storage case. [Explanation of symbols] 10...Mounting is done using the lid 14...Circuit board 16...Storage case 18...Lid 20...Fixing part 22...Screw hole 24... Iron plate 26... Hole 26... Extension part 28... Steel plate 30... Earth wire

Claims (1)

[Claims] 1. It consists of a case body with a screw fixing part provided inside, a blocking member installed on the inner wall of the case body to block external noise, and a blocking member installed on the back of the lid of the case body to block external noise. This is an electronic component storage case in which the lid is fixed to the case body with screws, and a part of the blocking member attached to the inner wall of the case body is extended to the top of the fixing part, and the case body and the lid are screwed together. An electronic component storage case characterized in that both blocking members are stopped and brought into contact with each other at the extended portion.