JPH0562098U - Electronics - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain an electronic device for improving and holding the electromagnetic shielding effect and improving productivity. [Structure] The cover 5 of the filter box 3 is fitted into the chevron-shaped protrusion 14 on the second surface, and a conductive adhesive 15 is applied to the gap. Further, at least two mesh-shaped protrusions 12 are provided outside the first surface 13 of the filter box 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electronic device that is required to have an electromagnetic shield effect, such as when a critical electronic circuit against noise is mounted.

[0002]

[Prior Art]

 4 is a cross-sectional view showing a conventional electronic device, and FIG. 5 is a view showing a cross-section CC of FIG. In the figure, reference numeral 1 is a chassis, and inside the chassis 1, an electronic circuit 2 and a filter box 3 are mounted. The filter box 3 is composed of a case 4 and a cover 5, and the cover 5 is fixed to the case 4 with a screw 7 with an EMI (ELECTRO MAGNETIC IN TERFERENCE) packing 6 for improving the electromagnetic shield effect sandwiched therebetween. ing. Further, the filter box 3 is attached to the inside of the chassis 1 with screws 9 with the EMI packing 8 sandwiched between the filter box 3 and the chassis 1. An external connector 10 and an electronic component 11 are housed inside the filter box 3.

In the conventional electronic device configured as described above, the EMI packing 6 sandwiched between the case 4 and the cover 5 provides electrical continuity between the case 4 and the cover 5, and the It has a structure that maintains the shielding effect. Further, the filter box 3 is structured such that the EMI packing 8 is attached between the filter box 3 and the chassis 1 so that the filter box 3 and the chassis 1 can be electrically connected and the electromagnetic shield effect can be maintained. There is.

[0004]

[Problems to be solved by the device]

 Since the conventional electronic devices are configured as described above, for an electronic circuit that is critical to noise, various types of noise generated from the vicinity of the external connector cause malfunction of the electronic circuit and cause a failure. Cause. To prevent this, in conventional electronic equipment, the external connector is housed in the filter box and mounted inside the chassis. Furthermore, in order to attenuate the noise leaking from the gap of the filter box, it is necessary to install EMI packing between the chassis and the cover of the filter box, which increases the number of parts and is not desirable in terms of productivity. There was a point.

In order to solve the above problems, it is an object of the present invention to obtain an electronic device with excellent productivity that can improve the electromagnetic shield effect without using EMI packing. ..

[0006]

[Means for Solving the Problems]

 The electronic device according to the present invention is provided with at least two mesh-shaped protrusions on the outside of the first surface of a box-shaped case made of a metal material having electrical conductivity. The opposing second surface is provided with a chevron-shaped projection, and an electrically conductive metal is provided by applying a conductive adhesive so that the chevron-shaped projection on the second surface can be fitted and closely attached. A filter box having a cover made of a metal material is attached from the inside of the chassis so as to be in close contact with the first surface.

[0007]

[Action]

 Instead of the EMI packing, the electronic device in this invention is fixed by meshing the mesh-shaped protrusions provided on the filter box into the chassis and making contact, and by fitting the filter box cover with the mountain-shaped protrusions on the case. By filling the gap with a conductive adhesive, the electromagnetic shielding effect is improved, the number of parts can be reduced, and the productivity is improved.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line BB of FIG. 1, and FIG. 3 is a detailed view of the filter box as seen from the connector side. In the figure, 1, 2, 9, 10, and 11 are exactly the same as the conventional electronic devices. The filter box 3 includes a case 4 and a cover 5. The case 4 is provided with a mesh-shaped protrusion 12 on a first surface that contacts the chassis 1. Further, the cover 5 is fitted into the chevron-shaped protrusion 14 on the second surface, and the conductive adhesive 15 is applied to the gap between the cover 5 and the chevron-shaped protrusion 14 on the second surface. ..

In the electronic device configured as described above, the noise generated from the external connector 10 causes the conductive adhesive 15 applied to the gap between the cover 5 and the chevron-shaped protrusion 14 on the second surface. As a result, the gap between the case 4 and the cover 5 can be completely closed, so that it does not leak out of the filter box 3. In addition, noise leaking to the outside from the gap between the external connector 10 and the chassis 1 also leaks to the outside of the chassis 1 because the mesh-shaped projections 12 provided on the case 4 bite into and contact the chassis 1. Not here. Thus, the conductive adhesive 15 provided in the gap between the cover 5 and the chevron-shaped protrusion 14 on the second surface and the mesh-shaped protrusion 12 provided on the case 4 of the filter box 3 are provided. By biting into and contacting the chassis 1, the electromagnetic shield effect can be improved without using the EMI packings 6, 8.

[0010]

[Effect of the device]

 According to the present invention, according to the present invention, the cover of the filter box is fitted into the chevron-shaped protrusion of the case, and the conductive adhesive is applied to the gap, and the case has the mesh-shaped protrusion that cuts into the chassis. Since it is configured to contact, the electromagnetic shield effect can be improved without using the EMI packing, and since the screws that fix the cover are not used, the number of parts can be reduced and the productivity is excellent. There is an effect that electronic devices can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electronic device according to an embodiment of the present invention.

FIG. 2 is a sectional BB view in FIG.

FIG. 3 is a detailed view of the filter box viewed from the connector side.

FIG. 4 is a cross-sectional view showing a conventional electronic device.

5 is a sectional CC view in FIG. 4. FIG.

[Explanation of symbols]

 1 Chassis 2 Electronic Circuit 3 Filter Box 4 Case 5 Cover 6 EMI Packing 7 Screw 8 EMI Packing 9 Screw 10 External Connector 11 Electronic Component 12 Mesh-like Projection 13 First Surface 14 Second Surface Mountain-Shaped Projection 15 Conductive adhesive

Claims (1)

[Scope of utility model registration request] 1. A box-shaped chassis having a connector round hole, an electronic circuit housed inside the chassis, and a box-shaped case made of a metal material having electrical conductivity inside the round hole for the connector. A circular connector conforming to the above is arranged from the inside of the first surface of the case, and further, electronic components are housed inside the case, and at least two mesh-like protrusions are provided on the outside of the first surface. With the above, the second surface opposite to the first surface is provided with a mountain-shaped protrusion, and fitted into the mountain-shaped protrusion of the second surface, and a conductive adhesive is applied to the gap. And a filter box attached by applying a conductive adhesive from the inside of the chassis so as to fit the circular hole for the connector. An electronic device that is characterized by