JP2001053482A - Shielding structure of electronics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shielding structure of electronics, for improving shielding effect from electromagnetic waves of electronic components and at the same time, for effectively using a large mounting area and reducing cost. SOLUTION: A shielding area 6 is formed by an elevation surface part 3 raised from one surface of an enclosure 1 and a side surface 5 of the enclosure 1, a substrate 7 where electronic components are mounted is arranged inside the shielding area 6 so that it can be fixed, and a cover 2 for covering the upper surface of the shielding area 6 is provided, so that it touches the side surface 5 of the elevation surface part 3 and the enclosure 1, and the substrate 7 where electronic components are mounted is covered by the elevation surface part 3, the side surface 5 of the enclosure 1, and the cover 2, thus achieving shielding effects from electromagnetic waves for the electronic components.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure of an electronic device, and more particularly, to a case where an electronic component disposed in a housing is adversely affected by electromagnetic waves from other electronic components disposed in the same housing, or The present invention relates to a shield structure for preventing an electronic component disposed in a housing from adversely affecting other electronic components due to electromagnetic waves.

[0002]

2. Description of the Related Art Conventionally, in an electronic device, in order to prevent the effect of electromagnetic waves from electronic components, a method of covering components that generate electromagnetic waves with a conductive metal such as aluminum to prevent the electromagnetic waves from leaking outside. I got it.

Normally, a board on which electronic components are mounted is mounted on the bottom of the housing, and then, as shown in FIG. 9, the entire board (not shown) is covered with a metal cover 100 to form a shield structure.

[0004] In order to cover the height of the electronic components mounted on the substrate, the cover 100 is formed in a box shape by bending the side portions 101 and 102. Further, cover fixing portions 103 and 104 for fixing the cover 100 to the bottom surface are required. Areas L ₁ , L for the stoppers 103, 104
₂ occupies the mounting area of the bottom surface, and the size of the cover increases to cover the height of the electronic components, which leads to an increase in cost. At the same time, a gap is likely to be formed in the bent joint portion 105 of the side portions 101 and 102, and the shielding effect is reduced.

A second conventional example will be described with reference to FIGS. 10 and 11. FIG. FIG. 10 is a perspective view, and FIG. 11 is a sectional view of a main part thereof. The board 112 on which the electronic components are mounted is the housing bottom 111
And a lower cover 121a and an upper cover 121b that cover the entire board 112 to form a shield structure. In order to cover the height of the electronic component mounted on the substrate 112, the lower cover 121a
Is bent at each side to form a U-shaped box shape. The upper cover 121b is bent in an L shape.

Further, a mounting piece 122 for fixing the lower cover 121a to the bottom of the housing is required. The area of the mounting piece 122 for fixing the lower cover 121a occupies the mounting area of the housing bottom surface 111, and the shapes of the covers 121a and 121b for covering the height of the electronic components are increased, so that the cost is increased. Lead to high. At the same time, as shown in FIG. 11, a gap 125 is likely to be formed at a portion where the side surface 123 of the lower cover 121a and the side surface 124 of the upper cover 121b are bent, and the shielding effect is reduced. Similarly, a gap is also formed at the joint between the upper cover lateral surface 127 and the lower cover side surface 123, and the shielding effect is reduced. The insulating plate 126 is for maintaining good insulation between the electronic components on the substrate 112 and the upper cover 121b.

[0007]

SUMMARY OF THE INVENTION The present invention takes into consideration such problems that the mounting area is large, the cost is high, and the shielding effect is reduced. , Improved each of these points,
That is, an object of the present invention is to provide a shield structure of an electronic device in which a shielding effect of an electronic component against electromagnetic waves is enhanced, a mounting area is effectively used, and cost is reduced.

[0008]

FIG. 1 shows the principle configuration of the present invention.
It will be explained based on the following. In FIG. 1, 1 is a housing, 2 is a cover, 3 is an elevation, 4 is a bottom surface, 5 is a side surface, 6 is a shield area, 7 is a substrate, 8 is a hole for fixing a substrate, 9 is an insulating plate, 1
0 is a cover fixing hole, and 11 is a convex portion.

[0009] The above problems are shown in the following (1) to (4):
This is achieved by the shield structure of the electronic device.

(1) A shield area 6 is formed by an upright portion 3 rising from one surface such as the bottom surface of the housing 1 and a side surface 5 of the housing 1, and electronic components are provided inside the shield area 6. The mounted substrate 7 is disposed so as to be fixable, and the cover 2 that covers the upper surface of the shield area 6 is provided so as to be in contact with the upright surface 3 and the side surface 5 of the housing. In addition, the cover 2 covers the substrate 7 on which the electronic components are mounted, thereby providing an electromagnetic wave shielding effect for the electronic components.

(2) A shield area 6 surrounded by an elevation 3 raised from one surface such as the bottom of the housing 1 and an upper surface of the shield area 6 so as to be in contact with a side surface of the elevation 3. A cover 2 is provided, and by covering the substrate 7 on which the electronic components are mounted with the elevation 3 and the cover 2, an electromagnetic wave shielding effect for the electronic components is achieved.

(3) In the above (1) or (2), a convex portion 11 is provided on a side surface of the cover 2, and the convex portion 11 is brought into contact with a side surface of the upright portion 3.

(4) In the above (3), the projections 11 formed on the side surfaces of the cover 2 are provided with slits 18 so that the projections 11 separated by the slits 18 can be moved independently. The contact between the cover 2 and the side surface of the upright portion 3 is further ensured.

Based on these, the following effects can be obtained.

(1) A shield area is formed by an upright portion rising from one surface such as a bottom surface of a housing and a side surface of the housing.
A cover is provided to cover the top surface of this shield area so as to be in contact with the side surface of this elevation and the side of the housing, so if the elevation does not require a mounting part, the mounting area can only be increased. In addition, since there is no portion where the lateral surfaces are aligned, it is possible to provide a low-cost shield structure that does not leak electromagnetic waves from the lateral surface and has an excellent shielding effect.

(2) A cover that forms a shield area surrounded by an upright portion rising from one surface such as the bottom surface of the housing, and covers the upper surface of the shield area so as to be in contact with the side surface of the upright portion. Is provided, in addition to the effect of the above (1), the degree of freedom of the position of the shield area can be increased by not using the side surface of the housing, and the degree of freedom of design can be increased.

(3) In addition to the above (1) and (2), since a convex portion is provided on the side surface of the cover and is brought into contact with the side surface of the upright portion and the side surface of the housing, the shielding effect is extremely simple, without leakage. Can be played.

(4) In addition to the above (3), a slit is provided in the convex portion on the side surface of the cover so that each convex portion moves independently. Even if there are some non-linear portions, it is possible to maintain good contact between the cover and these side surfaces and to ensure the shielding effect.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 is an exploded perspective view showing one embodiment of the shield structure of the present invention, FIG. 2 is a perspective view of one embodiment of the present invention, and FIG. 3 is a cover side surface of the shield structure of the present invention. FIG. 4 is a sectional view of a main part of the shield structure of the present invention, and FIG.
FIG.

In the figure, 1 is a housing, 2 is a cover, 3 is an upright portion, 4 is a bottom surface, 5 is a side surface, 6 is a shield area, 7 is a substrate, 8 is a hole for fixing a substrate, 9 is an insulating plate, 10 is a cover fixing hole, 11 is a convex portion, 12 is a stopper, 13 is a screw, 1
Reference numeral 4 denotes a fixing portion, 15 denotes a screw, 16 denotes a fixing portion, 17 denotes a stopper hole, 18 denotes a slit, and 19 denotes a coil.

The housing 1 houses various electronic components, and some of them, such as the coil 19, generate electromagnetic waves and have other adverse effects. Elevation 3 of housing 1
The side surface portion 5 may be formed by any method that can be integrated with the housing 1 such as die casting. Therefore, the material of the housing 1 is preferably a magnesium alloy or an aluminum alloy in terms of lightness.

The cover 2 covers the components generating the electromagnetic waves to prevent the electromagnetic waves from leaking to the outside, or to prevent the electromagnetic waves from the outside from adversely affecting the internal electronic components. It shuts off. As the material of the cover 2, elastic stainless steel is recommended, but any material having conductivity and elasticity may be used.

The upright portion 3 is provided with electronic components to be electromagnetically shielded in an inner area thereof. For example, the upright portion 3 is integrally formed from the bottom surface 4 of the housing 1 and is started up. In addition, the upright part 3 is not limited to this, and may be raised from another surface.

The shield area 6 is surrounded by the raised surface 3 and the side surface 5 and has a substrate 7 on which electronic components such as a coil 19 to be shielded from electromagnetic waves are mounted. This substrate 7 is provided with a screw 13 in a hole 8 for fixing the substrate, for example.
Is inserted and fixed to the fixing portion 14 by screws.

Further, the substrate 7 and the cover 2 are insulated from each other by the insulating plate 9, and the cover 2 having elasticity is inserted from above the insulating plate 9 into the fixing hole 10 for the cover, and the fixing portion 16 is screwed into the fixing portion 16. By fixing, it is fixed to the housing 1. At this time, the insulating plate 9 is positioned by the notch 9-1 engaging with the protrusion 3-1 of the upright surface 3.

As shown in FIGS. 4 and 5, a stopper 12 extending from the upper surface of the upright portion 3 of the housing 1 in a cylindrical shape.
Is provided. The stopper 1 is provided on the upper surface of the cover 2.
2, the cover 2 is positioned by engaging the stopper hole 17 with the stopper 12, and the convex portion 11 provided on the lower side surface of the cover 2 allows the cover 2 to be positioned as shown in FIG. The cover 2 is pressed in the direction of the arrow shown in FIG. 5 to securely contact the cover 2 and the housing 1 to enhance the shielding effect.

Further, as shown in FIG. 3, a slit 18 is provided in the convex portion 11 provided at the lower portion of the side surface of the cover 2 so that the convex portion 11 separated by each slit 18 can move independently. With this configuration, even if a part of the housing 1 or the upright portion 3 is slightly deformed, for example, the contact can be made, so that the contact can be made more reliable.

FIG. 6 shows a second embodiment of the present invention. In FIG. 6, as a form of the stopper, a plurality of standing pieces extending to the inside from the standing face 3 and the side face 5 of the housing 1 located at the lower end of the convex part 11 provided at the lower part of the side face of the cover 2. A stopper 20 is provided. Thereby, the cover can be securely arranged without providing the stopper hole 17 in the cover 2.

FIGS. 7 and 8 show a third embodiment of the present invention.
It will be explained based on the following. FIG. 7 shows a detailed view of the shield area 6 in the third embodiment, and FIG. 8 shows a detailed view of the stopper 21 of the cover 2 in the third embodiment.

In the third embodiment of the present invention, a shield area 6 for arranging a board (omitted in FIGS. 7 and 8) on which electronic components are mounted and shielding the board from electromagnetic waves is provided in the housing 1. It is formed only by the upright portion 3 from the bottom surface. In this example, as shown in FIG. 8, a plurality of covers 2 are formed, for example, as a pair of flat plates, which are flush with the upper surface of the cover 2 located on the upper surface of the upright portion 3 of the housing 1. Is provided.

As described above, the cover 2 can be accurately positioned and fixed on the upright portion 3 by the convex portion 11 and the stopper 21, and the shield area 6 can be electromagnetically shielded with a very simple configuration.

Further, in the third embodiment, the shield area 6 can be formed only by the upright portion without using the side surface of the housing 1, so that the arrangement position of the board on which the electronic components are mounted can be changed. A great degree of freedom can be given to the arrangement position without being limited to the usable position.

In the present invention, the cover 2
Although the shape of the convex portion formed on the side surface is described as an example of a semicircle, the present invention is not limited to this, and in addition to a curved shape, an appropriate shape such as a trapezoid or a V-shape may be used. it can.

The stoppers 12, 20, and 21 are not used only in the above-mentioned state, but can be freely combined and configured. The shape is not limited to this. Other shapes such as a triangle may be used.

According to the present invention, an upright portion from one surface of the housing and a cover for covering the housing enable effective use of the mounting area of the bottom surface of the housing and cost reduction by reducing the number of components, and also ensure shielding. The effect can be enhanced.

Japanese Patent Application Laid-Open No. 7-326880 discloses that
Although it is described that a shield case is provided on a substrate to shield electronic components on the substrate, the present invention shields electronic components on the substrate disposed inside the housing, and The purpose and the configuration are completely different from those described.

[0037]

According to the present invention, the following functions and effects can be obtained.

(1) A shield area is formed by an upright portion rising from one surface such as a bottom surface of a housing and a side surface of the housing.
A cover is provided to cover the top surface of this shield area so as to be in contact with the side surface of this elevation and the side of the housing, so if the elevation does not require a mounting part, the mounting area can only be increased. In addition, since there is no portion where the lateral surfaces are aligned, it is possible to provide a low-cost shield structure that does not leak electromagnetic waves from the lateral surface and has an excellent shielding effect.

(2) A cover that forms a shield area surrounded by an elevation raised from one surface such as the bottom of the housing, and covers the upper surface of the shield area so as to be in contact with the side surface of the elevation. Is provided, in addition to the effect of the above (1), the degree of freedom in the position of the shield area can be increased by not using the side surface of the housing, and the degree of freedom in design can be increased.

(3) In addition to the above (1) and (2), since a convex portion is provided on the side surface of the cover and is brought into contact with the side surface of the upright portion and the side surface of the housing, the shielding effect is extremely easy, without leakage. Can be played.

(4) In addition to the above (3), a slit is provided on the convex portion on the side surface of the cover so that each convex portion can move independently. Even if there are some non-linear portions, it is possible to maintain good contact between the cover and these side surfaces and to ensure the shielding effect.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of an embodiment of the present invention after assembly.

FIG. 3 is a diagram showing a convex shape of a side surface of a cover according to the present invention.

FIG. 4 is a sectional view of a main part of the shield structure of the present invention.

FIG. 5 is a sectional perspective view of a main part of the shield structure of the present invention.

FIG. 6 is a second embodiment of the present invention.

FIG. 7 is a detailed view of a shield area according to a third embodiment of the present invention.

FIG. 8 is a detailed view of a cover stopper according to the third embodiment of the present invention.

FIG. 9 is a conventional example (part 1).

FIG. 10 is a conventional example (part 2).

FIG. 11 is an explanatory diagram of a problem in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Cover 3 Elevation part 3-1 Protrusion part 4 Bottom surface 5 Side surface 6 Shield area 7 Substrate 8 Board fixing hole 9 Insulating plate 9-1 Notch 10 Cover fixing hole 11 Convex part 12 Stopper 13 Screw 14 Fixing Part 15 Screw 16 Fixing part 17 Hole for stopper 18 Slit 19 Coil

Claims (4)

[Claims] A shield area is formed by an upright portion rising from one surface of a housing and a side surface of the housing, and a board on which electronic components are mounted is fixedly disposed inside the shield area.
A cover for covering the upper surface of the shield area is provided so as to be in contact with the upright surface and the side surface of the housing. A shield structure for an electronic device, characterized in that the shield effect is achieved. And a cover for covering an upper surface of the shield area so as to be in contact with a side surface of the upright portion, wherein the shield area is surrounded by an upright portion raised from one surface of the housing. A shield structure for electronic equipment, wherein a cover on a substrate on which electronic components are mounted has an electromagnetic wave shielding effect on the electronic components. 3. The shield structure for an electronic device according to claim 1, wherein a convex portion is provided on a side surface of the cover, and the convex portion contacts the side surface of the upright portion. 4. The electronic device according to claim 3, wherein a slit is provided in a convex portion formed on a side surface of the cover, and the convex portion separated by each slit is configured to be independently movable. Equipment shield structure.