JPH0648946Y2 - Junction shield structure - Google Patents

Description

[Detailed description of the device] 【Overview】

Regarding the shield structure of the joint part of the electronic equipment case, the joint of the case is made to contact stably and evenly, and it is possible to surely shield against electromagnetic waves, and it is connected between a pair of cases through an elastic gasket. In the shield structure formed as described above, an inner projecting end protruding from one side wall surface is formed on one case edge, and an outer projecting end meshing with the inner projecting end is formed on the other case edge. Part and the inner projecting end part that meshes with the outer projecting end part are sandwiched in cooperation with the outer projecting end part to prevent lateral displacement, and a plurality of ribs are appropriately positioned so as to evenly distribute the compression force. A gasket that is provided and has alternating protrusions and notches formed on the opposite end faces of the two cases, and that is sandwiched between the outer protrusion end of the other case and the rib to prevent the gasket from falling off. Push by the end face of one case Attached and configured.

[Industrial applications]

The present invention relates to a plastic case used for a housing of an electronic device and subjected to an inner surface conductive treatment, and more particularly to a shield structure of a joint portion thereof. 2. Description of the Related Art Conventionally, in a case of an electronic device, a plastic case having an inner surface subjected to a conductive treatment is used in order to shield a radio wave from the outside or a radio wave leaking from the inside to the outside.

[Prior art]

FIG. 4 is a view showing an example of a conventional plastic case that has been subjected to a conductive treatment on the inner surface. The upper case 1, the lower case 2 and the front cover 3 are combined to shield the electronic circuit housed inside. . In this case, in order to prevent radio waves from leaking from the joint 4 between the upper case 1 and the lower case 2 and the joint 4 between the upper and lower cases 1 and 2 and the front cover 3, the joint is shown in the sectional view of FIG. It has such a structure. The structure shown in FIG. 5a is an inro cage type fitting structure, and the contact surface is subjected to the conductive treatment 5. Further, in the structure shown in FIG. 5b, a groove having a V-shaped cross section is formed in the lower case 2, and the upper case 1 is tapered so that the upper case 1 can be fitted into the groove. In addition, a conductive gasket 6 is used at the bottom of the V-shaped groove in order to improve the contact between them.

[Problems to be solved by the device]

However, in the conventional shield structure shown in FIG. 5a, the contact at the joint was unstable, and the shield property against electromagnetic waves was not perfect. There has been a problem that a large surface pressure is required to surely bring the joined portions into contact with each other, and the cases must be joined together with a strong force. Further, in FIG. 5b, a strong surface pressure is required in order to prevent the gasket from rising and to make uniform contact. For this reason, there has been a drawback that the wall thickness of the case must be increased and the housing must have increased rigidity, resulting in an increase in cost. Further, when the cases are detached for repair or the like and then re-joined, the gasket is deformed, and the contact becomes more uneven, and the shielding property is deteriorated. This invention was made to solve the above problems,
It is an object of the present invention to provide a shield structure of a joint portion that can stably and uniformly contact the seams of the housing and can reliably shield against electromagnetic waves.

[Means for Solving the Problems]

The present invention will be described with reference to FIGS. 1 to 3. In a shield structure in which a pair of cases 1 and 2 are coupled to each other via an elastic sket 6, one case 1 has an edge with An inner projecting end portion 1b projecting from one side wall surface is formed, and an outer projecting end portion 2b that meshes with the inner projecting end portion 1b and an outer projecting end portion 2b that mesh with the inner projecting end portion 1b at the edge 2 of the other case. Inner tip 1b
Is sandwiched in cooperation with the outer projecting end 2b to prevent lateral displacement, and a plurality of ribs are provided at appropriate positions so as to evenly distribute the compressive force. On the opposite end surfaces of the gasket 6, protrusions 1c and 2c and notches 1d and 2d that mesh with each other are alternately formed, and the gasket 6 is sandwiched between the outer protrusion end 2b of the other case 2 and the rib 10 to prevent the gasket 6 from falling off. Is pressed by the end surface of one case 1.

[Action]

Since the lower projection 2d is in the upper notch 1c and the upper projection 1d is trying to engage with the lower notch 2c, the gaskets 6 are alternately sandwiched at a large number of positions, so that a small pressing force is stable. The contact surface can be obtained.

【Example】

Hereinafter, the present invention will be described with reference to the drawings. In FIGS. 1 to 3, for example, the upper case 1 and the lower case 2 are connected via a conductive and elastic gasket 6.
The upper case 1 and the lower case 2 constitute a housing of an electronic device, and although not shown on the front surface and the back surface thereof,
Conductive treatment is applied. 1 is a perspective view of a joint between the upper and lower cases 1 and 2, FIG. 2 is a front view taken along the line A in FIG. 1, and FIG. 3 is a sectional view taken along line XX of FIG. First, the lower end portion of the upper case 1 has an outer half of the inner projecting end portion 1b in the thickness direction, and the end surface thereof is formed to be uneven in the width direction. On the other hand, at the upper end of the lower case 2, in the thickness direction,
2 is cut out to form a step portion 2a, and the remaining 1/2 outer protruding end portion 2b forms a uniform end face. The end surface of the stepped portion 2a is formed to be uneven in the width direction. In FIG. 3, the inner protruding end portion 1b of the upper case 1 is formed with a plurality of upper notches 1c at a constant cycle in the width direction, and the upper protruding portion is formed in the remaining portion.
Many 1d are formed. Further, the step portion 2a of the lower case 2 has a lower notch at a constant cycle in the width direction.
A large number of 2c are formed, and a large number of lower protrusions 2d are formed in the remaining portion. Then, in the state where the upper case 1 and the lower case 2 are joined, the upper protrusion 1d is the lower cutout 2c and the lower protrusion 2d is the upper cutout 1c.
The width of the upper notch 1c which opposes is larger than the width of the lower protrusion 2d, and the width of the lower notch 2c is larger than the width of the upper protrusion 1d. The upper and lower ends of the case 2 mesh with each other in an alternating manner. The width of the upper protrusion 1d and the lower protrusion 2d which are staggered in the vertical direction and the upper notch 1c
And the widths of the lower cutouts 2d are substantially equal to each other. Plate-shaped ribs 10 are integrally formed with the lower case 2 on the back surface of the lower protrusions 2d of the lower case 2, and the upper ends of the ribs 10 project above the lower protrusions 2d. The inner inner projecting end portion 1b of the upper case 1 which joins the upper case 1 and the lower case 2 with the above-mentioned configuration via the gasket 6 enters behind the outer outer projecting end portion 2b of the lower case 2 and contacts them.
The gasket 6 is surrounded by the back surface of the outer projecting end portion 2b, the stepped portion 2a, the multiple ribs 10 and the lower end surface of the inner projecting end portion 1b. Then, the upper protrusion 1d bends and pushes the gasket 6 into the lower cutout 2c, and the adjacent portion of the gasket 6 is bent and pushed by the lower protrusion 2d into the adjacent upper cutout 1c. Therefore, the gasket 6 is pressed against each other by the upper protrusion 1d and the lower protrusion 2d over the entire length thereof, so that a stable contact surface can be obtained. The intervals (pitch) between the upper and lower cutouts and the upper and lower protrusions can be changed according to the wavelength characteristics of the electromagnetic waves handled by the electronic device in the upper and lower cases. Further, this pitch is not necessarily a fixed cycle pitch but may be a random pitch. Further, the ribs may not be provided when the sandwiching of the gasket is stable, and the end configurations of the upper case and the lower case may be alternated with each other.

[Effect of device]

As described above, according to the present invention, by providing a plurality of ribs on one case, positioning between the cases and holding of the gasket are performed at the same time, and the gasket is provided between the one case and the other between the ribs. Since the compression force of the gasket generated by pressing with the case is evenly distributed, the electromagnetic wave shielding property of the joint portion of the housing of the electronic device can be ensured.

[Brief description of drawings]

 1 is a perspective view of the present invention, FIG. 2 is a view taken along line A of FIG. 1, FIG. 3 is a sectional view taken along line XX of FIG. 2, FIG. 4 is a conventional perspective view, and FIG. The figure is a conventional cross-sectional view. In the figure, 1 is an upper case, 1a is a step surface, 1b is an inner projecting end, 1c is an upper notch, 1d is an upper projecting part, 2 is a lower case, 2a is a step surface, 2b is an outer projecting end, and 2c is a lower notch. , 2d is a lower protrusion, 6 is a gasket, and 10 is a rib.

Claims (1)

[Scope of utility model registration request] 1. In a shield structure in which a pair of cases (1, 2) are coupled via an elastic gasket (6), the edge of one case (1) is projected from one side wall surface. An inner projecting end (1b) is formed, and an outer projecting end (2b) meshing with the inner projecting end (1b) and an outer projecting end ((b) are formed on the edge (2) of the other case. The inner protruding end (1b) meshing with 2b) is pinched in cooperation with the outer protruding end (2b) to prevent lateral displacement, and multiple ribs are appropriately positioned to evenly distribute the compression force. And protrusions (1c, 2c) and notches (1d, 2d) that mesh with each other are alternately formed on the opposite end faces of both cases (1, 2), and the other case ( 2) Outer tip (2b) and rib (10)
A shield structure of a joint portion in which a gasket (6) which is sandwiched between and is prevented from falling off is pressed by an end surface of one case (1).