JPH077190U - Shield case for small electronic devices - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a shield case for a small electronic device with a high shield effect that does not have structural restrictions such as escape holes and can reduce the soldering process. [Structure] A shield case in which a printed circuit board incorporating various electronic components, elements, etc. is assembled in a case body 2, and a lid 4 is fitted to the case body 2. In addition, the shield piece 3 is erected, and the leaf spring-shaped contact piece 5 having the tip 5a bent in an L shape is extended inside the lid body 4, and the lid body 4 is fitted into the case body 2. It is characterized in that the tip 5a of the contact piece 5 on the lid 4 side is elastically contacted with the side surface of the shield piece 3 on the case body 2 side when worn.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high-frequency circuit component, a shield case for a small electronic device used as a signal distribution modulator for various small electronic devices, and the like.

[0002]

[Prior art]

 Conventionally, in a shield case used for this kind of small electronic device, a printed circuit board incorporating various electronic components and elements is built into a conductive case body, and an opening on the upper or lower surface of the case body is installed. Is closed with a conductive lid to shield internal electronic components from external electric or magnetic fields. Therefore, in such a shield case, in order to stabilize the electrical conduction state between the case body and the lid, as shown in FIGS. 3 (a) to 3 (c), A shield plate is erected inside the case body, and a lid is brought into contact with the shield piece.

That is, FIG. 3A shows an example in which an L-shaped bent portion 12 a is formed on the upper end of the shield piece 12 standing upright inside the case body 11, and the upper surface of this bent portion 12 a is shown. Makes elastic contact with a contact piece 13a extending inside the lid 13. Further, FIG. 3B shows an example in which the upper end of the shield piece 14 is projected from the upper surface of the lid body 13 and the upper surface of the lid body 13 and the shield piece 14 are fixed by soldering 15. Further, in FIG. 3C, the upper end surface of the shield piece 16 is formed to be lower than the height of the case body 11, the upper surface of the shield piece 16 is preliminarily solder-plated, and then the contact piece 13 a extended from the lid 13 is provided. Is to make an elastic contact.

[0004]

[Problems to be solved by the device]

 However, in each of the above-described conventional shield case structures, the electrical ground contact between the case body 11 and the lid 13 is stable in both cases, but in the case of FIG. 3A, the printed circuit board 18 assembled in the case body 11 is used. In addition, there is a structural limitation that requires a large hole 18a to escape the bent portion 12a of the shield piece 12. Further, in the cases of FIGS. 3B and 3C, there was a problem that the man-hour for soldering increased and the cost increased.

An object of the present invention is to solve the above problems of the conventional structure and to obtain a shield case for a small electronic device having a high shield effect, which has no structural restrictions such as escape holes and can reduce the soldering process. is there.

[0006]

[Means for Solving the Problems]

 In order to achieve such an object, according to the present invention, a shield case is formed by assembling a printed circuit board in which various electronic components and elements are incorporated in a case body, and fitting a lid body to the case body. In addition, a shield piece is erected inside the case body, and a leaf spring-shaped contact piece whose tip portion is bent into an L shape is extended inside the lid body, and the lid body is attached. This is achieved by the tip end of the contact piece on the lid body elastically contacting the side surface of the shield piece on the case body side when fitted to the case body.

[0007]

[Action]

 Based on such a configuration, according to the present invention, there is provided a shield case for a small electronic device, in which a shield piece is erected inside the case body, and an L-shaped tip is provided inside the lid body. A leaf spring-shaped contact piece that is bent in a line is extended so that the tip of the contact piece on the lid side elastically contacts the side surface of the shield piece on the case body side when the lid body is fitted to the case body. This eliminates the need for soldering work as in the conventional structure, and improves the grounding performance and electrical characteristics of the case body and various electronic components and lid.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a main part of a shield case according to an embodiment of the present invention. Inside the case main body 2, electrical parts of various electronic parts assembled in the case main body 2 are electrically connected. In order to stabilize the ground contact, a shield piece 3 formed integrally with the case body 2 is erected. The upper end surface of the shield piece 3 is slightly lower than the height of the case body 2.

Further, a leaf spring-shaped contact piece 5 is integrally extended from the lid body 4 inside the lid body 4 fitted into the case body 2, and a tip portion 5 a of the contact piece 5 is formed. It is bent upwards. When the lid 4 is fitted into the case body 2, the tip 5a of the contact piece 5 extending inside the lid 4 is set to elastically contact the side surface of the shield piece 3 on the case body 2 side. To be done.

Therefore, according to the embodiment of the present invention configured as described above, when the lid body 4 is fitted to the case body 2, the tip portion 5a of the contact piece 5 on the lid body 4 side has the case body 2 attached. By elastically contacting the side surface of the shield piece 3 on the side, it is possible to stabilize the ground performance, electrical characteristics, etc. of the case body 2 and various electronic components and the lid body 4. Even if the upper end surface of the shield piece 3 is rusted due to aging, it does not cause a poor contact with the lid 4.

FIG. 2A is a cross-sectional view of a main part showing another embodiment according to the present invention, which extends from the lid 4 near the upper end of the shield piece 3 standing inside the case body 2. A bead-shaped stopper 3a is formed so that the front end 5a of the contact piece 5 is securely locked, and the lid 4 can be prevented from sinking or falling.

FIG. 2B is a cross-sectional view of a main part showing still another embodiment of the present invention, in which the tip 5b of the contact piece 5 extending inside the lid 4 is bent downward. When the lid 4 is fitted into the case body 2, the tip 5b of the contact piece 5 is elastically contacted with the side surface of the shield piece 3 on the case body 2 side.

FIG. 3C is a cross-sectional view of an essential part showing a modified example of the present invention, in which the upper end of the shield piece 3 standing inside the case body 2 is projected from the upper surface of the lid body 4. Then, the tip end of the contact piece 5 extending from the inside of the lid 4 is elastically contacted with the shield piece 3 at a position where it projects from the upper surface of the lid 4.

[0015]

[Effect of device]

 As described in detail above, the shield case for a small electronic device according to the present invention has a printed circuit board in which various electronic parts and elements are incorporated in a case body, and a lid body is fitted to the case body. In the shield case, the shield piece is erected inside the case body, and a leaf spring-like contact piece having a tip end bent into an L shape is extended inside the lid body. When the lid is fitted to the case body, the tip of the contact piece on the lid side is made to elastically contact the side surface of the shield piece on the case body side, so the ground performance of the case body and various electronic parts and the lid It is also possible to stabilize electrical characteristics and the like. Further, according to the present invention, the soldering work becomes unnecessary, and the cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part of a shield case that is an embodiment of the present invention.

2A to 2C are cross-sectional views of a shield case main part according to another embodiment of the present invention.

3 (a) to (c) are cross-sectional views of a main part of a shield case having a conventional structure.

[Explanation of symbols]

 2 Case body 3 Shield piece 4 Lid body 5 Contact piece 5a Tip

Claims (1)

[Scope of utility model registration request] 1. A shield case in which a printed circuit board incorporating various electronic components, elements, etc. is assembled in a case body, and a lid is fitted to the case body. A shield piece is erected, and a leaf spring-shaped contact piece whose tip is bent into an L shape is extended inside the lid body, and when the lid body is fitted to the case body, the contact on the lid body side is made. A shield case for a small electronic device, characterized in that the tip end of the piece elastically contacts the side surface of the shield piece on the case body side.