JPH10173380A - Shielding member for electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an electromagnetic wave shielding member, which is interposed between the opening of a housing incorporating electronic equipment and a lid covering the opening. SOLUTION: A flange section 12 is provided around the opening 11 of a housing 10, incorporating electronic equipment and a lid 20 is fitted to the flange section 12 with screws 30. The main body of each shielding member 100 is formed by winding a conductive flexible sheet 110 in a coil and has attaching holes 120. The shielding members 100 are fit to the flange section 12 by engaging the holes 120 of the members 100 with the projections 130 of the flange section 12. When the lid 20 is fit to the flange section 12 with the screws 30, the shielding members 100 are squeezed in the radial direction and electrically shield between the housing 10 and lid 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielding member for shielding leakage of electromagnetic waves from a housing of an electronic device or the like.

[0002]

2. Description of the Related Art FIG. 7 shows a general structure in which a lid 20 is fixed to a housing 10 for housing an electronic device by screws 30. A screw hole 14 is provided in a flange 12 provided around the opening 11 of the housing 10.
The screw 30 is inserted into the through hole 22 provided in the
Screw.

FIG. 8 shows an example of a plate-shaped shield member. A shield member 50 has a curved portion 52, and a slit 54 is provided in the curved portion so as to be easily bent. This shield member 50 is fixed to the flange 12 of the housing by an appropriate fixing means such as spot welding 56. Lid 20
Abuts on the housing and is screwed, so that the curved portion 52 of the shield member 50 is pressed, and the housing 10 and the lid 20 are pressed.
To prevent leakage of electromagnetic waves.

FIGS. 9 and 10 show another example of a conventional shield member and shield structure. The shield member indicated by the reference numeral 60 in its entirety has a structure in which the periphery of a prism-shaped sponge member 62 is covered with a mesh 64 made of a conductive material, and is attached with a double-sided tape 66 having a small width in the longitudinal direction. The shield member 60 is attached to the flange portion 12 of the housing 10 using the double-sided tape, and the lid 20 is screwed with the screw 30. The shield member 60 is pressed and the sponge member 62 is compressed, and conduction between the housing and the lid is prevented, thereby preventing leakage of electromagnetic waves.

FIGS. 11 and 12 show a shield member and a shield structure disclosed in Japanese Utility Model Laid-Open No. 7-7194.
The shield member 70 has a coil spring shape in a free state,
The shield member 70 is fixed to the flange portion 12 of the housing 10 with the fixture 72, and the lid 20 is screwed with the screw 30. The coil spring-shaped shield member 70 electromagnetically shields the space between the flange portion 12 and the lid 20.

[0006]

Among the above-mentioned prior arts, the one shown in FIGS. 7 and 8 uses a shield member 50 for the housing 1.
As means for attaching to the zero flange portion 12, processing or members such as spot welding, screws or rivets are required, and there is a problem that man-hours and the number of parts increase. 9 and 10 are easy to handle, but the cost is high and the compression ratio needs to be high in order to ensure the shielding performance.

Further, in the case where the shield member described in the prior art, Japanese Utility Model Laid-Open No. 7-7194, is formed in a spring shape, since the spring is made of a wire, it is vulnerable to a large external force and may be deformed (crushed, etc.). There is no shield effect. Further, in the case of a spring using a wire, there is a problem that a gap becomes large and a complete shield structure cannot be obtained. The present invention provides a shield member that solves these conventional problems.

[0008]

A shield member according to the present invention comprises a shield member body using a plate-shaped coil, a mounting hole formed in the body, and the shield provided on an opening surface of a housing of an electronic device. And a projection for holding the member, by inserting a mounting hole of the shield member into the projection,
The basic means is to attach the shield member. Further, a projection may be provided on the surface of the plate-shaped coil.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing the structure of a shield member of the present invention, FIG. 2 is a perspective view showing a mounting structure on a housing side, and FIG. 3 is a state in which the shield member of the present invention is mounted on a housing. FIG. The shield member, which is completely cured by reference numeral 100, is formed by winding a plate material 110 having conductivity and elasticity in a coil spring shape. The pitch P between adjacent plate members is formed at appropriate intervals. The diameter D _{1 of the} coil is selected depending on the shield structure to be used.
For example, it is about 10 mm. And the coil-shaped plate material 1
10 is provided with a mounting hole 120.

FIG. 2 shows a mounting structure provided on the flange portion 12 of the housing 10. The mounting structure is formed by cutting and raising the plate material of the flange portion into a triangular shape from the inside to form the mounting portion 130. The attachment portion 130 is formed with the top of the triangle facing upward of the housing 10.

FIG. 3 shows a state in which the shield member 100 is attached by inserting the hole 120 of the shield member 100 into the attachment portion 130 of the flange portion 12 of the housing 10. The shield member 100 can be attached to the flange portion 12 of the housing 10 both horizontally and vertically. In this state, by screwing the lid 20 to the housing with the screw 30, the shield member 100 is radially compressed, electrically connecting the housing and the lid, and preventing leakage of electromagnetic waves.

FIG. 4 is an explanatory view showing another embodiment of the present invention. The shield member 200 has a main body in which a conductive and elastic plate member 210 is wound in a coil shape, and a large number of protrusions 230 are formed on the main body surface. The protrusion 230 is formed by, for example, cutting and raising the plate member 220 from the inside to the outside. Then, a mounting hole 220 is formed in the plate member 220. According to this shield member 200, the projection 230 is pressed against the surface of the flange portion 12 of the housing and the surface of the lid 20, and secure electrical contact is ensured.

FIG. 5 shows still another embodiment of the present invention. The shield member 300 has a pipe-shaped main body 310 having conductivity and elasticity, and mounting holes 320 are provided at an appropriate pitch. It is fixed to the flange portion 12 of the housing 10 by inserting a hole 320 into the mounting projection 130.

FIG. 6 shows still another embodiment of the present invention. The shield member 400 is formed by forming a plate 410 into a cylindrical shape, and a slit 415 is provided between opposed end surfaces of the plate 410. Further, a mounting hole 420 is provided on the opposite side of the slit 415. The present shield member 400 is easily bent by the presence of the slit 415,
High adhesion to housing and lid.

[0015]

As described above, a shield material having elasticity and restoring force can be obtained by forming a coil from a low-resistance, plate-like elastic material and using it as a shield material. further,
Since the coil is formed in a plate shape, the housing and the lid can be in surface contact with each other, so that good shielding can be obtained. Further, it is easy to assemble with a structure in which the structure is merely applied to the projection provided on the housing in the hole provided on the coil. By providing the projection on the coil surface, contact with the housing and the lid increases, and a stable shielding effect can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a shield member of the present invention.

FIG. 2 is an explanatory view showing a shape of a projection for attaching a shield member of the present invention.

FIG. 3 is an explanatory view showing a state where the shield member of the present invention is attached to a housing.

FIG. 4 is an explanatory view of another shield member of the present invention.

FIG. 5 is an explanatory view of another shield member of the present invention.

FIG. 6 is an explanatory view of another shield member of the present invention.

FIG. 7 is a diagram showing a state in which a conventional shield member is attached to a housing.

FIG. 8 is a view showing a shield member conventionally used.

FIG. 9 is a diagram showing a state in which a conventional shield member is attached to a housing.

FIG. 10 is a view showing a conventionally used shield member.

FIG. 11 is a diagram showing a state where a shield member used in the prior art is attached to a housing.

FIG. 12 is a view showing a shield member used in the prior art.

[Explanation of symbols]

10 housing, 12 housing flange, 20 lid,
30 screw, 100 shield member, 110 plate-shaped coil member, 120 mounting hole, 130 protrusion.

Claims (4)

[Claims] 1. An opening of a housing for accommodating an electronic device or the like,
A shield member disposed between a lid covering the opening, a shield member main body formed by winding a plate material in a coil shape, a mounting hole formed in the shield member main body, and an opening surface of the housing. A projection for holding the shield member provided, wherein the projection is attached by inserting a mounting hole of the shield member into the projection. 2. The shield member for an electronic device according to claim 1, wherein a projection is provided on a surface of said plate-shaped coil. 3. A shield member formed in a thin cylindrical shape, a mounting hole formed in a shield member main body, and a projection provided on an opening surface of a housing for holding the shield member. 2. The shield member for an electronic device according to claim 1, wherein the shield member is attached by inserting a mounting hole of the shield member. 4. The shield member for an electronic device according to claim 3, wherein a slit is provided in the cylindrical shield member in a longitudinal direction.