JP2581455Y2 - Shield case - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield case, and more particularly to a shape of a contact portion with a ground terminal.

[0002]

2. Description of the Related Art FIG. 6 shows a conventional shield case. A board 2 is provided in the shield case 1, and various electronic components (not shown) are mounted on the back side of the board 2 in FIG. On the back side of the substrate 2, shield plates 3,
Are provided, and the ground terminals 4, 4,... Of the respective shield plates 3, 3,... Penetrate through the substrate 2 and protrude toward the front side of the substrate. A metal cover 5 is mounted on the shield case 1 and makes elastic contact with the ground terminals 4, 4... Protruding from the substrate 2 so that ground current flows through the plug 6 of the shield case 1 or a ground connection portion (not shown). )).

[0003] A contact portion between the metal cover 5 and the ground terminal 4 is formed, for example, by forming cuts on three sides of the metal cover 5 to form a cantilevered spring portion 7, as shown in FIG. 7. The metal cover 5 is mounted on the shield case 1 while being bent toward the substrate 2 and brought into elastic contact with the ground terminal 4. Alternatively, a slit parallel to the metal cover 5 is opened to form a double-ended spring portion 8, and the spring portion 8 is bent toward the substrate 2 as shown in FIG. The metal cover 5 is attached to the shield case 1 while making contact.

[0004]

As described above, in the conventional shield case 1, the cantilevered spring portion 7 or the both-sided spring portion 8 is bent toward the substrate 2, and the respective spring portions 7 or 8 are bent. The ground terminal 4 is brought into elastic contact with the ground. However, in the case of the cantilevered spring portion 7, only the base 7 a of the spring is connected to the metal cover 5, and the contact portion 7 b with the ground terminal 4 does not contact the metal case 5. Therefore, a voltage difference occurs between the base 7a of the spring of the metal cover 5 and the contact 7b, and the grounding effect is reduced.

Further, in the case of the double-ended spring portion 8, the elasticity of the spring is smaller than that of the cantilevered spring portion 7, so that it is necessary to finely adjust the amount of deflection of the spring. If the amount of flexure is small, the contact pressure is reduced and the ground effect is reduced. If the amount of flexure is too large, the metal cover 5 may be deformed when the metal cover 5 is mounted on the shield case 1. Then, while optimizing the elastic contact pressure with the ground terminal to eliminate the deformation of the metal cover and to obtain a technical problem to be solved to obtain a good grounding effect, the present invention solves this problem. The purpose is to:

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and is intended for a shield case in which a ground terminal is protruded from a substrate and a metal cover elastically contacts the ground terminal. A parallel slit is formed in a contact portion with the ground terminal to form a double- ended spring portion between the slits, and further, a cantilevered contact portion is formed in a central portion on one side of the spring portion. To provide a shield case in which the ground terminal is brought into elastic contact.

[0007]

The metal case and the ground terminal make elastic contact with each other at the contact portion, but the portion directly in contact with the ground terminal has a cantilever spring structure, so that the spring pressure can be easily adjusted. Since the spring portion indirectly in contact with the ground terminal has a double-sided spring structure formed between the two slits, a voltage difference does not occur at both ends, and the ground effect is good.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. For convenience of explanation, the same components as those of the related art will be described at the same time. FIG. 1 shows a shield case 11
A board 12 is provided in the shield case 11, and various electronic components (not shown) are mounted on the back side of the board 12 in FIG. The substrate 12
Are provided in some places on the rear side of the shield plate, and ground terminals 1 of the respective shield plates 13, 13.
., Project through the substrate 12 to the front side of the substrate 12. A metal cover 15 is mounted on the shield case 11, and elastically contacts the ground terminals 14, 14,... Protruding from the substrate 12, and ground current is supplied to the plugs 16, 16 of the shield case 11 or the ground connection portion ( (Not shown).

A contact portion between the metal cover 15 and the ground terminal 14 has a parallel slit formed therein, and a spring portion is formed between the slits. For example, as shown in FIGS. 2 and 3, the contact portion 17 has a spring portion 17c formed between the parallel slits 17a and 17b, and a U-shaped cutout portion 17d is formed in the center of the outside of the slit 17a. . A cantilevered contact portion 17e is formed by projecting a central portion on one side of the spring portion 17c at a portion surrounded by the notch portion 17d, and a lower surface of the contact portion 17e is projected toward the substrate 12 to be viewed in cross section. Form a C-shape.

Then, as shown in FIG. 3, the metal cover 15 is mounted on the shield case 11 while making the contact portion 17e projecting toward the substrate 12 elastically contact the ground terminal 14. At that time, the C-shaped contact portion 17e contacts the ground terminal 14 while being plastically deformed, and pushes the spring portion 17c back in the twisting direction. That is, since the contact portion 17e that directly contacts the ground terminal 14 has a cantilever spring structure and bends while twisting the entire spring portion 17c, it is easy to adjust the spring pressure and indirectly contact the ground terminal 14. Since the contacting spring portion 17c has a double-ended spring structure, no voltage difference occurs at both ends, and the grounding effect does not decrease.

Next, the contact portion indicated by reference numeral 18 in FIG. 1 has the same shape as the contact portion 17 in plan view.
The contact portion 18e corresponding to the contact portion 17 e is no curved portion of the C-shaped cross section, to form a contact portion 18e and the surface of the metal cover 15 on the same plane. In such a case, if the position of the ground terminal 14 is made to protrude high and the metal cover 15 is attached to the shield case 11, the ground terminal 14 is brought into contact with the contact portion 18e.
To make elastic contact.

As a deformation of the contact portion 18, a contact portion 19e shown in FIG. 1 does not protrude into the slit 19a on one side, and the contact portion 19e corresponds to the contact portion 18e. There is no notch corresponding to the portion 17d, and the slit 19a is linearly opened with the same width. Further, the contact portion 20 shown in FIG.
Like FIG. 9, the parallel slits 20a and 20b are opened in a straight line. However, as shown in FIGS. 4 and 5, a protrusion 20f projecting toward the substrate 12 is provided at the base of the contact portion 20e. is there. If so, the projection 20f is connected to the ground terminal 14.
The elastic contact makes it possible to obtain a more reliable grounding effect.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0014]

As described in detail in the above embodiment, the present invention has a cantilever spring structure for directly contacting the ground terminal, so that the spring pressure can be easily adjusted and the ground terminal is indirectly connected to the ground terminal. Since the spring portion that comes into contact with the spring has a double-ended spring structure, no voltage difference occurs at both ends, and the grounding effect does not decrease.

In this manner, the advantages of the cantilever spring and the advantages of the double-support spring are shared, thereby preventing deformation of the metal cover and obtaining good shielding characteristics.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a shield case according to an embodiment of the present invention.

FIG. 2 is a front view showing a main part of a contact portion.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a front view showing a main part of a contact portion according to a modification.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a partially cutaway front view of a conventional shield case.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a sectional view taken along line DD of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Shield case 12 Substrate 14 Earth terminal 15 Metal cover 17, 18, 19, 20 Contact part 17a, 17b Slit 19a, 20a, 20b Slit 17c Spring part 17e, 18e Contact part 19e, 20e Contact part

Claims (1)

(57) [Scope of request for utility model registration] In a shield case in which a ground terminal is protruded from a substrate and a metal cover is elastically contacted with the ground terminal, a parallel slit is opened in a contact portion with the ground terminal to form a gap between the slit and the ground terminal. A shield case, wherein a double- sided spring portion is formed on the spring portion, and a cantilevered contact portion is formed at a central portion on one side of the spring portion to elastically contact the ground terminal.