JPH09162583A - Shield structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the shielding of an electronic apparatus. SOLUTION: An upper cover 10 and a lower cover 20 which have conductivity and are different in the thickness of side surface are formed. On the side surface inner wall 10c, a first rib 10b is formed which has conductivity, is set a little lower than the height of the upper cover 10 side surface, and has a first notched part at the tip of the engaging side with the lower cover 20. On the side surface inner wall 20c, a second rib 20b is formed which has conductivity, is set a little lower than the height of the lower cover side surface, and has a second notched part at the tip of the engaging side with the upper cover 10. A gasket 30 is formed which has conductivity and elasticity and is set a little wider than the width of the first or the second notched part of the rib 10b or the rib 20b. The gasket 30 is set in the first and the second notched parts of the ribs 10a, 20b, and the upper cover 10 is engaged with the lower cover 20. Thereby the gasket 30 is compressed in the lateral direction, and the upper cover 10 is electrically connected with the lower cover 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure for a housing of electronic equipment.

[0002]

2. Description of the Related Art FIG. 4A is a block diagram of a shield structure of a housing in a general electronic device before assembly. Hereinafter, description will be given with reference to FIG. The housing is divided into an upper cover 1 and a lower cover 2, and the upper cover 1 and the lower cover 2
The mounting bases 1a and 2a are provided in each. A protrusion 1b is formed on the upper cover 1 and a groove 2b is formed on the lower cover 2. The upper cover 1 and the lower cover 2 are made of aluminum die cast or plastic that has been subjected to a conductive treatment such as electroless plating.

The protrusion 1b and the groove 2b are formed together when the upper cover 1 and the lower cover 2 are formed, and are subjected to a conductive treatment. Reference numeral 3 denotes an elastic gasket made of conductive rubber, silicone rubber coated with a conductive coating material, or sponge to which a conductive cloth is attached.

FIG. 4B is a sectional view after the upper cover 1, the lower cover 2, the gasket 3 and the substrate 4 shown in FIG. 4A are assembled. Next, the operation will be described with reference to FIG. A gasket 3 is put in the groove 2b. The substrate 4 is placed on the lower cover 2, the upper cover 1 is placed on the lower cover 2, screws 5 are inserted into the mounting base 2a from the back side of the lower cover 2, and the mounting base 1a of the upper cover 1 is tightened with the screws 5. As a result, the gasket 3 is compressed by the protrusion 1b in the groove 2b, the upper cover 1 and the lower cover 2 are electrically connected, and the substrate 4 is shielded from the interference wave from the outside.

[0005]

However, in the above construction, a large gasket cannot be inserted because a groove is provided in the wall of the housing to insert the gasket. Therefore, there is a problem in that the contact between the gaskets becomes unstable due to variations in the upper cover and the lower cover due to warping or deformation of the housing, and the shield is not stable.

[0006]

An upper cover and a lower cover which are electrically conductive and have different side surfaces are provided. The inner wall of the side surface of the upper cover is provided with a first rib having conductivity and having a height slightly lower than the height of the side surface of the upper cover, and having a first cutout portion at the tip end on the side to be fitted with the lower cover. . A second rib having conductivity on the inner wall of the side surface of the lower cover, having a height set to be slightly lower than the height of the side surface of the lower cover, and having a second cutout portion at a tip end to be fitted with the upper cover. To provide. Further, a gasket having conductivity and elasticity and having a width slightly larger than the width of the first or second cutout portion of the rib is provided. A gasket is put in the first and second notches of the rib, and the upper cover and the lower cover are fitted to compress the gasket in the lateral direction to electrically connect the upper cover and the lower cover.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a configuration diagram of a first embodiment of the present invention, FIG. 1 (a) is a configuration diagram of a shield structure of the first embodiment before assembly, and FIG. 1 (b) is FIG. 1 (a). 3 is a cross-sectional view of the upper cover 10, the lower cover 20, the gasket 30, and the substrate 4 shown in FIG. Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b).

Components equivalent to those of the conventional technique are designated by the same reference numerals. Reference numeral 10 denotes an upper cover, which is formed of the same material as the upper cover 1 described in the related art. 10a is a mount, which is made together when the upper cover 10 is made. 10b
The ribs are provided on the side wall 10c at regular intervals and have conductivity, and the height thereof is set to be slightly lower than the height of the side surface of the upper cover 10. Also, the ribs 10b are made together when the upper cover 10 is made, and the ribs 10b will be described later in detail.
It has a notch at the tip of the side that fits with. 10d, 1
0e is a taper for chamfering. A lower cover 20 is formed of the same material as the upper cover 10. The side surface of the upper cover 10 is made slightly thicker than the lower cover 20. Reference numeral 20a is a mount, which is made together when the lower cover 20 is made.

Reference numeral 20b is a rib, which has conductivity and is provided on the inner wall 20c of the side surface at regular intervals, and its height is lower cover 20.
The height is set to be slightly lower than the height of the side surface, and a notch portion is provided at the tip end on the side fitted with the upper cover 10. Also, rib 2
0b is made together when the lower cover 20 is made. The notch of the rib 10b is a rectangular space between the rib 10b and the side wall 10c. The cutout portion of the rib 20b is a rectangular space between the rib 20b and the side wall 20c. Reference numeral 30 is a gasket formed of the same material as the gasket 3 described in the related art, and the width thereof is the rib 1
It is designed to be slightly larger than the width of the notch so that it is compressed in the lateral direction when it is inserted into the notch of 0b and 20b.

Next, the operation of the first embodiment of the present invention will be described with reference to FIG. 1 (b). If the gasket 30 is attached to the notch of the rib 20b, the gasket 3
0 is compressed and fixed, and the inner side wall 20 of the lower cover 20 is fixed.
Contact with c. Then, the substrate 4 is placed on the lower cover 20. Next, when the upper cover 10 is put on the lower cover 20,
Gasket 30 is rib 10 by taper 10d, 10e
It is guided to the notch of b and compressed, and comes into contact with the side wall 10c. Then, the side wall inner wall 10c and the side wall inner wall 20c are electrically connected by the gasket 30, and the upper cover 10 and the lower cover 20 are electrically connected. Further, the board 4 is fixed by the mounting base 10a, the mounting base 20a, and the screws 5.

Since the thickness of the side surface of the upper cover 10 is slightly thicker than the thickness of the side surface of the lower cover 20, when the gasket 30 is inserted into the notch portion of the rib 10b and the notch portion of the rib 20b, the gasket 30 is directed toward the inside of the housing. Although it is distorted, this is to ensure contact between the upper cover 10 and the lower cover 20. The thickness of the side surface of the upper cover 10 may be slightly thinner than the thickness of the side surface of the lower cover 20. That is, the gasket 30 may be distorted toward the outside of the housing when put in the notches of the upper cover 10 and the lower cover 20. Further, only the side surface inner wall 10c that contacts the gasket 30 may be made slightly thinner than the thickness of the lower cover 20. Also in these cases, the top cover 1
A stable contact between 0 and the lower cover 20 is obtained. Further, only the side wall 10c that contacts the gasket 30 may be slightly thicker than the side surface of the lower cover 20. Also in this case, stable contact can be obtained.

By these, the upper cover 10 and the lower cover 2
0 is also electrically connected, and the substrate 4 is shielded from an interference wave from the outside.

Further, the gasket 30 is compressed when it is put in the notch, but the ribs 10b, 20b and the gasket 30 are designed so that there is almost no vertical compression.
Further, the cutout portion of the upper cover 10 is made slightly wider than the cutout portion of the lower cover 20 so that the gasket 30 is fixed to the lower cover 20 when the housing is disassembled and is not lost as a component.

The joint surfaces of the upper cover 10 and the lower cover 20 are fitted with a step, so that the inside of the housing cannot be seen from the outside after the fitting. This is to prevent the gasket 30 from being seen from the outside after fitting.

As described above, according to the first embodiment of the present invention, the gasket 30 is brought into contact with the inside of the housing. Therefore, the shield is not affected by variations in the fitting of the upper cover 10 and the lower cover 20 due to warping or deformation of the housing, and the contact area between the gasket 30 and the housing can be increased, so that the shield is stable. Becomes

In the second embodiment of the present invention, the rib 10b is deleted from the structure of the first embodiment. FIG. 2 shows an upper cover 11 and a lower cover 2 according to the second embodiment of the present invention.
FIG. 3 is a cross-sectional view after assembling 1, the gasket 31 and the substrate 4.

A second embodiment of the present invention will be described below with reference to FIG. The same reference numerals are given to those equivalent to those of the conventional technique and the first embodiment. Reference numeral 11 denotes an upper cover, which is formed of the same material as the upper cover 10,
Reference numeral 1b is a taper, and 11c is a side surface inner wall of the upper cover 11. Reference numeral 21 denotes a lower cover, which is formed of the same material as the lower cover 20. 21b are ribs and are made together when the lower cover 21 is made, and have conductivity, and the side inner wall 2 of the lower cover 21 is formed.
1c is provided at regular intervals, and its height is slightly higher than the height of the side surface of the lower cover 21. Further, the notch of the rib 21b is provided at the tip end on the side to be fitted with the upper cover 11. 21d has a stepped shape on the rib side surface of the rib 21b. Reference numeral 31 denotes a gasket, which is formed of the same material as the gasket 30, and its width is designed to be slightly larger than the width of the notch so that the rib 21b is laterally compressed when it is put in the notch. Further, the thickness of the side surface of the upper cover 11 is made slightly thicker than the thickness of the side surface of the lower cover 21.

The operation of the second embodiment of the present invention will be described below with reference to FIG. When attaching the gasket 31 to the lower cover 21, the gasket 31 has ribs 21
It is compressed and fixed to the notch of b, and contacts the side inner wall 21c. Then, the substrate 4 is placed on the lower cover 21. Next, when the upper cover 11 is put on the lower cover 21, the gasket is compressed by the ribs 21b by the taper 11b,
It contacts the inner side wall 11c. The gasket 31 is a rib 2
1b, the rib 21b is shown in FIG.
Although it is slightly higher than the height of the rib 21b, it may be slightly lower than the height of the rib 21b as long as sufficient contact with the side wall 11c is obtained.

The substrate 4 is mounted on the mount 10a, mount 20a,
It is fixed with screws 5. Since the thickness of the side surface of the upper cover 11 is made slightly thicker than the thickness of the side surface of the lower cover 21 and the rib side surface 21d of the rib 21b has a stepped shape, the gasket 31 is distorted inward of the housing. This is to ensure contact with the lower cover 21 of the upper cover 11 more securely. As a result, the upper cover 11 and the lower cover 21 are electrically connected to each other, and the substrate 4 is shielded from interference radio waves from the outside.

As described above, according to the second embodiment of the present invention, the same effect as that of the first embodiment can be obtained, and the upper cover 11 need not be provided with the ribs.
In comparison with the embodiment described above, simplification in designing and manufacturing can be achieved.

FIG. 3 is a configuration diagram of a third embodiment of the present invention, FIG. 3 (a) is a configuration diagram of a shield structure of the third embodiment before assembly, and FIG. 3 (b) is a diagram. 3 (a), the upper cover 12, the lower cover 22, the gasket 32, and the substrate 40.
It is sectional drawing after the assembly of. Hereinafter, a third embodiment of the present invention will be described with reference to FIGS. 3 (a) and 3 (b). The same reference numerals are given to those equivalent to those of the conventional technique and the first and second embodiments. An upper cover 12 is formed of the same material as the upper cover 10. Reference numeral 12a is a mount, which is made together when the upper cover 12 is made. 12
Reference numeral b is a rib provided on the inner wall 12c of the side surface of the upper cover 12 at a constant interval, which has conductivity, and its height is set to be slightly lower than the height of the side surface of the upper cover 12 so as to fit with the lower cover. It has a notch at the side tip. The rib 12
The b is made together when the upper cover 12 is made. 12d, 1
2e is a taper for chamfering.

A lower cover 22 is formed of the same material as the upper cover 10. The thickness of the side surface of the upper cover 12 is made slightly thicker than the thickness of the side surface of the lower cover 22. 22a is a mount, which is made together when the lower cover 22 is made. Reference numeral 22b is a rib provided on the inner wall 22c of the side surface of the lower cover 22 at regular intervals, which has conductivity, and its height is set to be slightly lower than the height of the side surface of the lower cover 22. Also, 22b
Has a notch at the tip that fits with the upper cover,
It is made together when the lower cover 22 is made. 32 is a gasket having a protrusion 33, the width of which is the rib 12b,
It is designed to be slightly larger than the width of the notch so that it is laterally compressed when it is put into the notch of 22b. Reference numeral 40 denotes a substrate having an unillustrated electronic component that is weak against jamming radio waves on one surface, an unillustrated electronic component that generates jamming radio waves on the other surface, and a substrate having a ground plane in the middle layer, and 41 is provided at an end of the substrate 40. It is a ground plane.

Next, the operation of the third embodiment of the present invention will be described with reference to FIG. Rib 22b
Place the gasket 32 on the gasket 32 and the side wall 2
2c contacts. Further, the substrate 40 is placed on the gasket protrusion 33 and the upper cover 12 is covered. Taper 12
The gasket 32 is guided to the notch of the rib 12b and compressed by d and 12e, and the side wall 12c and the gasket 32 are guided.
Contact. As a result, the inner surface of the side wall 1
2c and the side wall 22c are electrically connected, and the upper cover 12
And the lower cover 22 are electrically connected.

The board 40 is mounted on the mounting base 12a and the mounting base 22.
a, fixed with screws 5. The gasket protrusion 33 is designed to be compressed between the substrate 40 and the rib 22b and to be able to contact the ground surface 41. Further, the gasket protrusion 33 is compressed between the substrate 40 and the rib 12b, and
It may be designed so that it can come into contact with a grounding surface provided on the surface opposite to the grounding surface 41 of zero. Furthermore, mounting base 1
2a and the mounting base 22a are also attached to the gasket protrusion 33 on the substrate 40.
Is designed to be loaded. A ground plane is provided in the middle layer of the substrate 40. By these, the two spaces divided by the substrate 40 inside the housing are electrically shielded, and also the space outside the housing is electrically shielded.

Further, as in the first embodiment, since the thickness of the side surface of the upper cover 12 is slightly thicker than the thickness of the side surface of the lower cover 22, the gasket 32 has the cutout portion of the rib 12b and the cutout portion of the rib 22b. When it is put into the housing, it is distorted inward of the housing, which is to ensure the contact between the upper cover 12 and the lower cover 22. The thickness of the side surface of the upper cover 12 may be slightly thinner than the thickness of the side surface of the lower cover 22. That is, the gasket 32 includes the rib 12b and the rib 2
When inserted in the notch 2b, it may be distorted toward the outside of the housing. Further, only the side wall 12c that contacts the gasket 32 may be slightly thinner than the thickness of the lower cover 22. Also in these cases, stable contact between the upper cover 12 and the lower cover 22 can be obtained. Further, only the side wall 12c that contacts the gasket 32 may be slightly thicker than the side surface of the lower cover 22. Also in this case, stable contact can be obtained.

As described above, according to the third embodiment of the present invention, the electronic component, which is mounted on one surface of the board 40 and is vulnerable to the jamming radio waves, has the jamming waves from the outside of the casing and the board 40. The electronic components (not shown) mounted on the other surface are shielded from the interfering radio waves.

Further, in the first to third embodiments of the present invention, the ribs 10b, 12b, 20b, 21b and 22b are the upper covers 10, 11, 12 and the lower covers 20, 2 respectively.
Although they are provided at regular intervals on the inner side surfaces of Nos. 1 and 22, in the case of die casting, they may be provided on the inner wall of the side surfaces in a plate shape and have notches at the tips. In this case, the shield becomes more stable. In the case of plastic, a sink mark (sink m
ark) may occur, the ribs 10b, 20b, 2
It is not preferable to make 1b into a plate shape. The mark indicates a hollow formed on the surface of the molded product due to a partial vacuum in the molding material in the mold.

The ribs 10b and 12b and the ribs 20b and 2 are
Each of 1b and 22b may be provided at the same position when they are fitted together, or may be provided in a staggered manner, and the larger the number, the more stable the shield can be. The height of the ribs 10b and 12b is lower than the height of the side surfaces of the upper covers 10 and 12,
The heights of b and 22b are lower than the heights of the side surfaces of the lower covers 20 and 22. This is to prevent the upper covers 10 and 12 and the lower covers 20 and 22 from hitting each other. is there.

[0029]

As described in detail above, according to the present invention,
Since the contact of the gasket is made on the side surface inside the housing, the contact of the gasket can be stabilized due to the variation of the upper cover and the lower cover due to the warp or deformation of the housing, and the shield can be stabilized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a shield structure according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a shield structure according to a second embodiment of the present invention.

FIG. 3 is a diagram showing a shield structure according to a third embodiment of the present invention.

FIG. 4 is a diagram showing an example of a conventional shield structure.

[Explanation of symbols]

 4 ... Substrate 5 ... Screw 10 ... Upper cover 10a, 20a ... Mounting base 10b, 20b ... Rib 10c, 20c ... Side inner wall 10d, 20d ... Taper 20 ... Lower cover 30 ... Gasket

Claims (3)

[Claims] 1. A shield structure for shielding an interference radio wave from the outside of an electronic device, wherein two covers having conductivity and having different side surfaces are provided, and one cover side inner wall has conductivity and height. Is set to be slightly lower than the height of the side surface of the cover, and a first rib having a first cutout portion is provided at the tip of the side that fits with the other cover. It has a height slightly lower than the height of the side surface of the cover, and a second rib having a second cutout portion is provided at the tip of the side to be fitted with the one cover, which has conductivity and elasticity. A gasket having a width slightly larger than the width of the first or second notch portion of the rib is provided, the gasket is put in the first or second notch portion of the rib, and then the two covers are attached. By mating The shield structure is characterized in that the gasket is put in the notch portion of the other rib and laterally compressed to electrically connect the two covers. 2. A shield structure for shielding an electromagnetic wave from the outside of an electronic device, wherein two covers having conductivity and having different side surfaces are provided, and one cover side inner wall having a small side surface is electrically conductive. The height of the cover is set to be slightly higher than the height of the side surface of the cover, and the thickness of the side surface is thick, and a rib having a cutout is provided at the tip of the side where the other cover fits. A gasket having elasticity and having a height set so as to contact the side wall of the other cover when the two covers are fitted to each other, and having a width slightly larger than the width of the cutout portion of the rib, The gasket is put in the cutout portion of the rib, and then the two covers are fitted to compress the gasket laterally, thereby electrically connecting the two covers. De structure. 3. In a shield structure for shielding an interference wave from the outside of an electronic device and an interference wave generated inside the electronic device, two covers having conductivity and having different side surfaces are provided, and one cover side wall is provided. Is provided with a first rib having conductivity and having a height slightly lower than the height of the side surface of the cover, and having a first cutout portion at the tip of the side to be fitted with the other cover. A second inner side wall of the cover, which has conductivity and whose height is set to be slightly lower than the height of the side surface of the cover, and which has a second cutout portion at the tip end on the side to be fitted with the one cover.
Is provided with a rib having a conductivity and elasticity, and a gasket having a width slightly larger than the width of the protrusion and the first or second notch of the rib is provided. , An electronic component that generates an interfering radio wave is placed on the other surface, a substrate having a ground plane at the middle layer and the end is provided, and the gasket is put in the first or second cutout portion of the rib, and then the gasket The projections of the first or second rib and the ground surface of the end of the substrate are compressed in the horizontal and vertical directions by fitting the two covers, and A shield structure for electrically connecting the ground of the substrate.