JP3058869U - Grounding structure of shield case in electric equipment and lead wire used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs by reducing the number of components such as crimp terminals and screws, and to provide a shield for electric equipment which does not cause poor contact and does not require high processing accuracy. Provided are a case grounding structure and a lead wire used therefor. SOLUTION: The connection of a shield case 2 to a ground pattern of a circuit board 1 has one end on the shield case 2.
The plurality of lead wires 5 are connected to two connection points and the other end 6 is connected to a ground pattern on the circuit board 1, and the other end 6 of the plurality of lead wires 5 One end of each of a plurality of lead wires 5 is assembled to one crimp terminal 3 and crimped, and is connected to the shield case 2 with a screw 4.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a grounding structure for a shield case in electric equipment and a lead wire used for the same.

[0002]

[Prior art]

 For example, as shown in FIG. 3, a grounding structure of a shield case in an electric device using a conventional lead wire includes a circuit board 1 having a ground pattern (not shown) and an upper surface side of the circuit board 1. A shield case 2 is provided, and the connection of the shield case 2 to the ground pattern of the circuit board 1 is performed by connecting the crimp terminals 3 at one end to a plurality of connection points on the shield case 2 with screws 4, respectively. The other end of each of the plurality of lead wires 5 is connected to a ground pattern on the circuit board 1, and the other end of each of the plurality of lead wires 5 is located on the circuit board 1 under different ground pattern positions. Was connected to.

However, in this case, the crimp terminals 3 are crimped to one end of each lead wire 5, and the crimp terminals 3 are respectively connected to a plurality of connection points on the shield case 2 with screws 4. Therefore, there is a problem that the number of parts such as screws 4 is large and the cost is high, and moreover, the number of steps in assembling is increased.

As a conventional shield case for a small electronic device, there is one disclosed in Japanese Utility Model Laid-Open Publication No. 7-7190. As shown in FIG. 4, a printed circuit board incorporating various electronic components and elements is mounted in a case body 12, and a lid 14 is fitted to the case body 12. A shield case, in which a shield piece 13 is erected inside the case body 12 and a tip end portion 15a is bent into an L-shape inside the cover body 14; When the contact piece 15 is extended and the cover 14 is fitted to the case main body 12, the tip 15a of the contact piece 15 on the cover body 14 becomes the shield piece 13 on the case main body 12 side. It is configured to be in contact with the side of the.

However, in this case, there is a problem that poor contact is likely to occur when dust or the like adheres to the shield piece 13 or the contact piece 15. Moreover, in order to make the shield piece 13 and the contact piece 15 surely come into contact with each other, there is a problem that high positional processing accuracy is required.

[0006]

[Problems to be solved by the invention]

 The present invention solves the above-mentioned conventional problems, can reduce the number of components such as crimp terminals and screws, and can reduce costs.Moreover, there is no need for poor contact, and high processing accuracy is required. The purpose of the present invention is to provide a grounding structure for a shield case in an electrical device and a lead wire used for the same.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 is directed to an electric device including a circuit board having a ground pattern and a shield case disposed above or near the circuit board. The connection to the ground pattern is made by a plurality of wires having one end connected to one connection point on the shield case and the other end connected to the ground pattern on the circuit board. The other end of the wire is characterized in that it is connected to a ground pattern position under different conditions on the circuit board.

According to a second aspect of the present invention, there is provided a lead wire used for a grounding structure of a shield case in the electric device according to the first aspect, wherein one end of each of the plurality of lead wires is gathered into one crimp terminal. It is characterized by being crimped. The invention according to claim 3 is characterized in that the other ends of a part of the plurality of lead wires are crimped to crimp terminals. The invention according to claim 4 uses a grounding wire for grounding the ground from the shield case of the deck arranged on the board to the board, screws the crimp terminal to the shield case, and fixes the plurality of pieces. The other end of the lead wire is soldered or screwed to the substrate, respectively.

[0009]

[Embodiment of the invention]

 Hereinafter, the grounding structure of the shield case and the lead wires used for the same in the electric device according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a grounding structure of a shield case in an electric device using a lead wire according to an embodiment of the present invention. The same members and the same portions as those in the conventional example shown in FIG.

As shown in FIG. 1, a grounding structure of a shield case in the electric device of the present embodiment includes a circuit board 1 having a ground pattern (not shown), and a shield case disposed on the upper surface side of the circuit board 1. 2 is provided. Then, the connection of the shield case 2 to the ground pattern is made by connecting the crimp terminal 3 of the two lead wires 5 having one end crimped to the one crimp terminal 3 to one connection point on the shield case 2. The other end 6 is connected to a ground pattern position on the circuit board 1 under different conditions. The lead wires 5 are used as ground wires for grounding the shield case 2 to the circuit board 1, and the other ends 6 of the lead wires 5 are soldered to the circuit board 1.

As described above, one end of each of the two lead wires 5 is crimped to the crimp terminal 3, and is connected and attached at one connection point on the shield case 2 with the screw 4. The number of parts such as the crimp terminal 3 and the screw 4 can be reduced as compared with the above, and the cost can be reduced. In addition, since the connection is made at one connection point on the shield case 2 with the crimp terminal 3 or the screw 4, no contact failure occurs, and high processing accuracy is not required.

FIG. 2 is a perspective view showing a lead wire according to another embodiment, in which the other end 6 of one of the two lead wires 5 is crimped to the crimp terminal 3. . According to this, the crimp terminal 3 crimped to the other end 6 of the one lead wire 5 can be screwed to the circuit board 1 (see FIG. 1), so that its use can be broadened.

In the above-described embodiment, the case where the number of the lead wires 5 is two has been described. However, the present invention is not limited to this, and one end of each of the plurality of lead wires 5 is connected to one crimp terminal 3. You may crimp. Further, the present invention is not limited to the case where one end of each of the plurality of lead wires 5 is crimped to the crimp terminal 3, but may be arranged such that one end is gathered. The crimp terminals 3 may be connected to one connection point on the shield case 2 and attached.

[0014]

[Effect of the invention]

 As described above, according to the invention of claim 1, the connection of the shield case to the ground pattern has one end connected to one connection point on the shield case and the other end connected to the circuit board. The connection is made of a plurality of wires connected to the ground pattern, and the other ends of the plurality of wires are connected to ground pattern positions having different conditions on the circuit board, so that one end is connected to one place of the shield case. Since the connections are concentrated at points, when screws are fixed, the number of screws can be reduced, and the number of parts such as screws can be reduced, thereby reducing costs. In addition, contact failure does not occur, and high processing accuracy is not required.

According to the second aspect of the present invention, since one end of each of the plurality of lead wires is gathered and crimped to one crimp terminal, the number of components such as crimp terminals and screws can be reduced. Cost can be reduced. According to the invention of claim 3, since the other ends of the plurality of lead wires are crimped to the crimp terminal, when the other ends of the lead wires must be screwed, This can be adequately dealt with, and its use can be broadened.

According to the invention of claim 4, when the lead wires are used as ground wires for dropping the ground from the shield case of the deck to the substrate, a plurality of ground wires which are assembled and pressed to the crimp terminal are used. Since one end of the wire can be screwed to the shield case at a time, the number of components such as crimp terminals and screws can be reduced and cost can be reduced. High accuracy is not required.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a grounding structure of a shield case in an electric device using a lead wire according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a lead wire according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a state in which ground is dropped from a shield case of a deck on a substrate to a substrate using a conventional lead wire.

FIG. 4 is a cross-sectional view showing a structure for dropping ground in a shield case of a conventional small electronic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Shield case 3 Crimp terminal 4 Screw 5 Lead wire 6 The other end

Claims (4)

[Utility model registration claims] A circuit board having a ground pattern;
In an electric device including a shield case disposed above or near the circuit board, the shield case is connected to the ground pattern, one end is connected to one connection point on the shield case, and It is made with multiple wires whose ends are connected to the ground pattern on the circuit board,
The other ends of the plurality of wires are connected to different ground pattern positions on the circuit board under different conditions. 2. A lead wire for use in a grounding structure of a shield case in an electric device according to claim 1, wherein one end of each of the plurality of lead wires is assembled to one crimp terminal and crimped. Lead wire. 3. The lead wire according to claim 2, wherein the other ends of the plurality of lead wires are crimped to crimp terminals. 4. A crimp terminal is screwed to the shield case, and the other end of the plurality of lead wires is used as an earth wire for grounding the shield case of a deck arranged on the board to the board. 4. The lead wire according to claim 2, wherein the lead wire is soldered or fixed to the substrate.