JP2545388Y2 - Grounding bracket - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a metal fitting for grounding a housing and a wiring board disposed in the housing in an electronic device such as a mobile radio communication device that handles high frequency. About.

[Conventional technology]

In a mobile radio communication device that handles high frequencies, depending on a circuit on which a wiring board disposed in a housing is formed, there is a possibility that high-frequency radiation from a circuit on another wiring board may be adversely affected. For this reason, it is necessary to employ some kind of ground structure for the wiring board.

FIG. 3 is an exploded perspective view showing a mounting structure of a conventional grounding bracket used in a mobile radio communication device. In the figure, reference numeral 1 denotes a bottom surface of a housing of a mobile radio communication device, and a protrusion 2 extending in the front-rear direction in the figure is integrally formed on the bottom surface 1. Reference numeral 3 denotes a wiring board on which various circuit patterns are formed and on which electronic components are mounted. Although not shown on the lower surface of the wiring board 3, an earth pattern is formed corresponding to an earthing metal 15 described later.

Reference numeral 15 denotes a conventional grounding bracket. This grounding bracket 15
Is composed of a pair of both side pieces 16 and an upper piece portion 17, and is entirely formed of a conductive spring material. This grounding bracket 15
The upper piece 17 is provided with a cut-and-raised portion 18.

The grounding bracket 15 is attached to a predetermined position of the projection 2. The wiring board 3 is attached to a predetermined position of the housing 1. The height of the mounted wiring board 3 is substantially the same as the height of the projection 2, and the ground pattern of the wiring board 3 is pressed against the cut-and-raised portion 18 of the grounding metal 15. As a result, the wiring board 3 and the housing 1 are sufficiently grounded, and the ground potentials of the two become the same, a shielding effect occurs at the projection 2 of the housing 1 as a boundary. To prevent adverse effects on

[Problems to be solved by the invention]

However, in the above-mentioned conventional grounding metal fitting, if the mounting and dismounting are performed several times, the spring property of the cut-and-raised portion 18 of the grounding metal 15 is weakened, and thus the ground pattern of the wiring board 3 and the cut-and-raised portion 18 And the shielding effect between the wiring board 3 and the housing 1 is reduced. Also, the contact between the projection 2 and the grounding metal 15 is not always sufficient because the contact between the projections 2 and the grounding metal 15 depends only on the contact force of the both side pieces 16 of the grounding metal 15. Becomes incomplete.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a grounding metal fitting that is completely grounded and does not change its grounding effect no matter how many times mounting and dismounting are performed. is there.

[Means for solving the problem]

In order to achieve this object, the grounding bracket of the present invention is formed by bending a conductive band-shaped spring piece into an M-shape and by forming bent portions inwardly bent on opposite side pieces. Things.

[Action]

In the present invention, by bending the band-shaped spring piece into an M-shape, both sides of the upper piece protrude, and the entire upper piece retains strong spring properties. Presses both sides of the upper piece against the spring property, so that the wiring board and the grounding metal are sufficiently contacted. At the same time, when the wiring board presses both sides of the upper piece, the bent portions on both sides press and hold the protrusion, so that the grounding metal and the protrusion are sufficiently contacted.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. It is to be noted that components denoted by the same reference numerals as those in the related art indicate the same configuration, and detailed description will be omitted. In these figures, the reference numeral 5 designates a grounding bracket according to the present invention, which comprises a pair of both side pieces 6 and an upper piece portion 7, and is entirely formed of a conductive band-shaped spring piece. A first bent portion 8 which is bent inward is formed on both side pieces 6 facing each other. The interval between the first bent portions 8 is formed smaller than the width of the projection 2, and the interval between both end edges 9 of the both side pieces 6 is formed larger than the width of the projection 2.

The upper piece 7 is bent and formed in an M shape, and a second tangential portion 10 bent inward is formed at the center. The formation of the second bent portion 10 causes both sides 11 of the upper surface portion 7 to protrude upward. By forming these tangent portions 8 and 10, both side pieces 6 and upper piece 7 have strong spring properties.

The grounding metal fitting 5 is attached to the projection 2 of the housing bottom surface 1. At this time, the interval between both end edges 9 of both side pieces 6 is the protrusion 2
Is formed to be larger than the width, so that the grounding metal fitting 5 can be easily attached to the projection 2. As shown in FIG. 2 (a), the grounding metal fitting 5 attached to the projection 2 has strong spring properties of the first bent portion 8 and the second bent portion 10 at these three points. And at the same time, the three bent portions 8 and 10 are in ground contact.

FIG. 2B shows a state in which the wiring board 3 is mounted at a predetermined position in this state. Both sides 11 of the upper piece 7 of the grounding metal fitting 5 are pressed against each other by the attached wiring board 3, and the upper piece 7 is deformed flatly against spring properties. Due to the deformation of the upper piece 7, the tangent portions 8 of the both pieces 6 are deformed inward from each other. Due to the deformation of the tangent portion 8, the grounding fitting 5 is further firmly fixed to the projection 2.

Therefore, in the state of FIG. 2B with the wiring board 5 attached, the wiring board 3 and the grounding metal 5
In addition, the grounding metal fitting 5 and the projection 2 can obtain a strong contact force with each other. In other words, the wiring board 3 and the projection 2 are reliably grounded via the grounding metal fitting 5.

In addition, since the grounding metal 5 according to the present invention has a spring property throughout, the internal stress generated when an external force is applied and deforms is dispersed throughout the metal fitting. Will be held by the public.

[Effect of the invention]

As described above, according to the grounding bracket of the present invention,
The projection is held by the three bent portions, and the holding is further strengthened by the press-contact force at the time of mounting the wiring board. A strong contact force is obtained, so that the wiring board and the projection are reliably grounded. Further, since three bent portions are provided, internal stress generated when the wiring substrate is deformed by pressure contact of the wiring board is dispersed, so that the spring property is held semipermanently and the device can withstand repeated use a plurality of times.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a mounting structure of a grounding metal according to the present invention, and FIG. 2 is a side sectional view of a main part showing the mounting state, and FIG. FIG. 3B is a diagram showing a state where a wiring board is mounted, and FIG. 3 is an exploded perspective view showing a conventional mounting structure of a grounding bracket. 1,..., Housing bottom, 2 ... projection, 3 ... wiring board,
5, 15, ... Grounding bracket, 6, 16 ... Side piece, 7, 17 ...
... Upper piece, 8, 10 ... Bend, 18 ... Cut-and-raised part.

Claims (1)

(57) [Scope of request for utility model registration] 1. A grounding metal fitting, wherein a band-shaped spring piece having conductivity is bent in an M-shape, and bent portions are formed by bending inward on both side pieces facing each other.