Electronic circuit module

Abstract

The present invention provides an electronic circuit module capable of specifying the mounting position of a cover body, with respect to a circuit board, with high accuracy. The electronic circuit module is provided with a circuit board 10, having a notch 12 on two opposite side faces and a box-shaped cover body 11 having two claw portions 11d, arranged separately in the notch 12 and formed of a metal plate attached so as to cover the upper face of the circuit board 10. A cut 12a is formed, linearly extending inward, crossing both the edges of the notch 12 from the side face of the circuit board 10, and in such a notch 12, both edges of the width direction of the claw portion 11d is made to face a linear part of the cut 12a.

Description

technical field [0001] The present invention relates to an electronic circuit module configured by attaching a cover made of a metal plate to a circuit board, and more particularly to an electronic circuit having a structure in which claws of the cover are arranged in cutouts provided on the side surface of the circuit board to position both of them. module. Background technique [0002] For example, in wireless communication equipment, an electronic circuit module in which a cover such as a shield box made of a metal plate is attached to a circuit board on which a high-frequency circuit or the like is laid can be used. Such a structure is generally known in such an electronic circuit module, and the cover body forming a box shape is installed as covering the upper surface of the circuit substrate. The lower end of the side wall of the cover is soldered to the ground electrode formed on the upper surface of the circuit board (for example, refer to Patent Document 1) with th...

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Problems solved by technology

[0006] But when Figure 8 In the electronic circuit module of the prior art shown, since the long holes 2A are formed by making the circular holes penetrated by the drill continue along a straight line on the large-size substrate 1A, and in the division process of the large-size substrate 1A, there are two equal lengths. The cutout 2 of the circuit board 1 is formed by dividing the long hole 2A, so both ends along the longitudinal direction of the cutout 2 form an arc-shaped curved surface that divides the circular hole into four, and in the cutout 2 of such a shape, It is easy to position the cover body 3 in the plate thickness direction of the claw portion 3a, but it may not be suitable for positioning with high precision in the width direction of the claw portion 3a.

That is, if Figure 10 As shown in the partial enlarged view of , since the claw portion 3a of the cover body 3 is arranged along the flat surface 2a extending in the longitudinal direction of the notch portion 2, by making the flat surface 2a abut against the inner wall surface of the claw portion 3a, it is possible to suppress the The cover body 3 is displaced in the Y direction (thickness direction of the claw portion 3a) in the figure, but the curved surface 2b of the notch portion 2 cannot be brought into contact by making the flat surface 2a abut against the inner wall surface of the claw portion 3a. At both ends in the width direction of the claw portion 3a, a relatively large gap is required between the curved surface 2b and the claw portion 3a

As a result, the cover body 3 moves toward the Figure X direction (the width direction of the claw portion 3a), it is difficult to specify the mounting position of the cover body 3 relative to the circuit board 1 with high precision.

[0007] In addition, if the same cutouts 2 are formed on the other two side surfaces located on the short side of the circuit board 1, and the claws protruding from the four side wall parts of the cover body 3 are inserted into these cutouts 2, If the cutout portion 3a is configured like this, the position of the cover body 3 relative to the circuit board 1 can be specified with high precision in both X-Y directions. However, when the number of the cutout portions 2 is increased to four in this way, there will be many problems on the circuit board 1. There is a dead zone, the degree of freedom of the wiring pattern is reduced, or the shape of the cover 3 is complicated.

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