JP2007142230A - Shield case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently secure electric contact between a shield case body and a shield cover without increasing a cost in a shield case comprising the shield case body and the shield cover. <P>SOLUTION: A plurality of claws 21 for securing electric contact with the side face of the shield case body 1 are formed on the outer peripheral end of the shield cover 2. Notches 22 and a constriction 26 are formed on both the sides of each claw 21 of the shield cover 2. Due to the notches 22 formed on both the sides of the claw 21, horizonal and vertical elastic deformation is generated in the claw 21. In addition to the elastic deformation, elastic deformation in a third direction, i, e. slight elastic deformation due to rotational operation (twist) in the right and left direction around the claw 21, is generated by the constriction 26 formed in the claw 21, so that the claws 21 can be brought into contact with the inwall surface 11 of the shield case body 1 always in parallel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield case having a shield structure for preventing leakage and interference of radio waves in an electronic device, and in particular, a shield case body that accommodates an electronic component mounted on a printed wiring board, and an opening of the shield case body The present invention relates to a shield case provided with a shield cover that covers a shield and forms a shield space.

  Conventionally, a shield cover used in this type of shield case is formed of a thin elastic metal plate, and an outer peripheral end thereof is cut on both sides and bent downward substantially at a right angle so as to be elastically deformed. The thing of the structure which provided the some nail | claw formed in is proposed (for example, refer patent document 1).

  Thus, by providing a plurality of elastically deformed claws on the outer peripheral end of the shield cover, when the shield cover is attached to the shield case main body and closed, the plurality of claws are provided on the outer periphery of the shield case main body. The shield cover is fixed to the shield case main body, and electrical contact is made between them to form a shield space.

  In addition, for example, a Z-shaped shim member connected to each of the wall surfaces of the shield case main body is attached to another conventional shield case, and the wall surface of the shield cover is fitted into the shim member. There has been proposed a structure in which a shield cover is coupled to the shield case main body so that electrical contact and electrical shielding between them are performed (see, for example, Patent Document 2).

Japanese Utility Model Publication No. 5-20389 JP 2005-235951 A

  However, in the conventional shield case described above, the shield case body and the shield cover are configured to be coupled by the engagement of the claws or shim members. It is necessary to secure a sufficient coupling between the main body and the shield cover.

  In particular, in the case where notches are formed on both sides of the nail provided on the shield cover, the horizontal variation due to the elasticity that deforms in the horizontal and vertical directions with the base of the nail and the bent portion of the nail as a fulcrum is somewhat However, it is difficult to absorb the error in the vertical direction, and high accuracy in manufacturing such as the dimensions of the shield case body and shield cover is required. There was a problem of becoming a factor.

  Further, depending on the bending accuracy of the claw provided on the shield cover, it may not be possible to contact the side surface of the shield case body in parallel. In order to eliminate such problems and make the claws strongly press against the side surface of the shield case body in order to contact the side surface of the shield case body in parallel, as a result, the shield cover is attached to the shield case body. There was a problem that it became extremely tight.

  Further, a structure in which a Z-shaped shim member is attached to the wall surface portion of the shield case main body, and the wall surface portion of the shield cover is fitted into the shim member, the wall surface portions of the shield case main body and the shield cover The contact surface with the shim member is not necessarily parallel, and there is a problem in that the contact surface between the shim member and the wall surface portion is floated, resulting in an incomplete electrical contact.

  The present invention is intended to solve the problems of such a conventional configuration, and ensures sufficient mechanical coupling between the shield case main body and the shield cover to provide electrical contact and electrical shield. It aims at providing the shield case which can be ensured reliably.

  In order to achieve the above object, the present invention provides a shield cover provided with a plurality of claws at the outer peripheral end for ensuring electrical contact between a shield case main body for housing electronic components and a side surface of the shield case main body. The plurality of claws are provided with cuts on both sides and formed with a constriction. The shield case is configured to attach the shield cover to the opening of the shield case main body and close the lid.

  In the second solution, the constriction formed on the claw is formed in the vicinity of the bent portion of the claw formed by bending the outer peripheral end of the shield cover.

  The third solving means is that a constriction formed on the nail is formed at the base of the nail.

  Further, the fourth solving means is constituted by a concentric semi-circular punch formed continuously on the cut portions on both sides of the constriction formed on the nail.

  The operation of the first solving means is as follows. That is, the cuts provided on both sides of the nail cause elastic deformation in the horizontal and vertical directions with the base of the nail as a fulcrum. Further, due to the constriction formed on the nail, in addition to the elastic deformation in the horizontal direction and the vertical direction described above, the elastic deformation in the third direction, that is, the rotational movement (twisting in the horizontal direction around the center of the nail) ) Can cause some elastic deformation, and can absorb a dimensional error or the like of the side surface of the shield case body with which the claws come into pressure contact.

  In addition, the action of the second solution means that the cuts provided on both sides of the nail cause elastic deformation in the horizontal direction and the vertical direction with the base part of the nail and the bent part of the nail as fulcrums. Further, by forming a constriction in the vicinity of the bent portion of the nail, in addition to the elastic deformation in the horizontal direction and the vertical direction described above, elastic deformation in the third direction, that is, left and right with the center of the nail as the axis It is possible to cause some elastic deformation due to rotational movement (twisting) in the direction, and to absorb a dimensional error or the like of the side surface of the shield case main body with which the claws come into pressure contact.

  In addition, the action of the third solution means that the notch provided on both sides of the nail causes elastic deformation in the horizontal direction and the vertical direction with the base portion of the nail as a fulcrum. Furthermore, by forming the constriction at the base of the nail, in addition to the elastic deformation in the horizontal direction and the vertical direction described above, the elastic deformation in the third direction, that is, in the left-right direction around the center of the nail. It is possible to cause a slight elastic deformation due to the rotation operation (twisting), and it is possible to absorb a dimensional error or the like of the side surface of the shield case main body with which the claws come into pressure contact. In addition, by providing the constriction formed on the nail at a position deeper than the bent portion of the nail, that is, at the base of the nail, the constriction is urged when rotating (twisting) in the left-right direction around the center of the nail. Tension can be set strongly.

  Further, the action of the fourth solution means that the constriction formed by opposing semicircular punches formed continuously with the cuts provided on both sides of the nail causes elastic deformation of the nail in the horizontal and vertical directions. On the other hand, it is possible to cause elastic deformation in the third direction, that is, slight elastic deformation due to rotational movement (twisting) in the horizontal direction around the center of the nail, and the shield case body in which the nail is in pressure contact It is possible to absorb a dimensional error or the like on the side surface of the.

  As described above, when the plurality of claws formed on the shield cover are brought into contact with the side surface of the shield case main body, the shield case of the present invention has the notches provided on both sides of the claws so that the claws are horizontally and vertically oriented. While the elastic deformation occurs, the constriction formed on the nail causes the nail to be elastically deformed in the third direction, that is, slightly elastically deformed by the rotational movement (twisting) in the horizontal direction around the center of the nail. This makes it possible to always bring the claws into contact with the side surface of the shield case main body in parallel.

  Also, by changing the position of the constriction formed on the nail, the balance of the tension applied during horizontal (vertical) and left-right rotation (twisting) can be changed, taking into account the elastic deformation characteristics of the nail in advance. Can be set.

  As a result, it is possible to absorb the dimensional error of the side surface of the shield case body, so that higher accuracy is not required for manufacturing, and the electrical contact between the shield case body and the shield cover is increased. Therefore, the electrical characteristics such as electromagnetic shielding performance can be improved.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is an external perspective view showing a configuration of a shield case according to the first embodiment. FIG. 2A is an enlarged perspective view of a main part of the shield cover shown in FIG. FIG. 2B is an enlarged perspective view of the main part of the shield cover used in the seal case according to the second embodiment.

First, a first embodiment of a shield case according to the present invention will be described based on FIG. 1 and FIG.
In FIG. 1 and FIG. 2A, reference numeral 1 denotes a concave shield case main body for accommodating a circuit board such as a transmission unit of a communication device or its circuit components (not shown) and for applying an electromagnetic shield. The shield cover is mounted on the upper surface of the shield case body 1 and has a plurality of claws 21 formed on the outer peripheral end thereof.

  The plurality of claws 21 are formed by bending the outer peripheral end of the shield cover 2 downward substantially at a right angle so that the front end portion 23 can smoothly come into pressure contact with the inner wall surface 11 of the shield case body 1. It is formed by bending. Further, on both sides of the claw 21, notches 22 reaching the upper surface of the shield cover 2 are provided. Further, the claw 21 is formed with a constriction 26 formed by a semicircular punch 25 facing in the vicinity of the bent portion 24 of the claw 21.

  Therefore, according to the above configuration, when the shield cover 2 is attached to the shield case body 1 and the plurality of claws 21 formed on the shield cover 2 are brought into pressure contact with the inner wall surface 11 of the shield case body 1, With the notch 22 provided in the claw 21, the claw 21 is elastically deformed in the horizontal direction and the vertical direction with the base portion 28 of the claw 21 and the bent portion 24 of the claw 21 as fulcrums.

  Further, due to the constriction 26 formed on the claw 21, in addition to the elastic deformation in the horizontal and vertical directions described above, the claw 21 is elastically deformed in the third direction, that is, as shown in FIG. The claw 21 is always brought into contact with the inner wall surface 11 of the shield case body 1 in parallel by the slight elastic deformation caused by the rotation (twisting) in the left direction a or the right direction b around the center of the claw 21. It becomes possible.

  As a result, it is possible to absorb a dimensional error or the like of the inner wall surface 11 of the shield case main body 1, so that higher accuracy is not required in manufacturing, and the electric power between the shield case main body 1 and the shield cover 2 is not required. Can be reliably ensured without causing an increase in cost, and electrical characteristics such as electromagnetic shielding performance can be improved.

  Next, a second embodiment of the shield case according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as 1st Embodiment mentioned above, and the overlapping description is abbreviate | omitted.

  The shield cover 2 shown in FIG. 2B is characterized in that the constriction 27 is formed at the base portion 28 of the claw 21. The constriction 27 is constituted by an opposing semicircular cutout 25 formed continuously from the cuts 22 on both sides at the base portion 28 of the claw 21.

  Therefore, according to the above configuration, when the shield cover 2 is attached to the shield case body 1 and the plurality of claws 21 formed on the shield cover 2 are brought into pressure contact with the inner wall surface 11 of the shield case body 1, With the notch 22 provided in the claw 21, the claw 21 is elastically deformed in the horizontal direction and the vertical direction with the base portion 28 of the claw 21 and the bent portion 24 of the claw 21 as fulcrums.

  In addition to the elastic deformation in the horizontal direction and the vertical direction described above, the constriction 27 formed in the claw 21 causes elastic deformation in the third direction, that is, rotation in the left-right direction around the center of the claw 21. When the elastic deformation due to the operation (twisting) occurs, the claw 21 can always be brought into contact with the inner wall surface 11 of the shield case body 1 in parallel.

  Further, the constriction 27 formed on the claw 21 is formed at a position deeper than the bent portion 24, that is, at the base 28 portion of the claw 21, so that it is located near the bent portion 24 as in the first embodiment described above. Compared with the case where the constriction 26 is formed, it is possible to set a stronger tension to be applied during the rotation operation (twisting) in the left-right direction. In this way, by changing the position at which the constriction 27 is formed, the tension balance that is urged during the horizontal and vertical rotations (twisting) can be changed, and the elastic deformation characteristics of the claw 21 are taken into consideration in advance. Can be set.

  As a result, it is possible to absorb a dimensional error or the like of the inner wall surface 11 of the shield case main body 1, so that higher accuracy is not required in manufacturing, and the electric power between the shield case main body 1 and the shield cover 2 is not required. Can be reliably ensured without causing an increase in cost, and electrical characteristics such as electromagnetic shielding performance can be improved.

  In addition, in the said 1st, 2nd embodiment, although the structure which contacts the nail | claw 21 with the inner wall surface 11 of the shield case main body 1 was demonstrated, it was not limited to this and formed in the shield cover 2 Even when the claw 21 is configured to come into contact with the outer surface of the shield case main body 1, similar actions and effects can be obtained.

  Further, although the case where the constrictions 26 and 27 are constituted by the semicircular punch 25 has been described, the invention is not limited to this, and the claw 21 is elastically deformed in the third direction, that is, the center of the claw 21 is formed. Any punching shape that can be configured so that a slight elastic deformation is caused by the rotational movement (twisting) in the left-right direction as an axis may be used.

1 is an external perspective view showing an embodiment of a shield case according to the present invention. The perspective view which expanded the principal part of the shield cover used for the shield case

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield case body 2 Shield cover 21 Claw 22 Cut 23 Tip part 24 Bending part 25 Extraction 26, 27 Constriction 28 Root

Claims (4)

A shield case main body that accommodates electronic components; and a shield cover that is provided with a plurality of claws at an outer peripheral end to ensure electrical contact with a side surface of the shield case main body, and the shield cover is provided at an opening of the shield case main body. In a shield case configured to be attached and closed,
The plurality of claws are provided with cuts on both sides and formed with a constriction.   2. The shield case according to claim 1, wherein the constriction formed on the claw is formed in the vicinity of a bent portion of the claw formed by bending the outer peripheral end of the shield cover.   The shield case according to claim 1, wherein the constriction formed on the nail is formed at a base of the nail.   4. The shield case according to claim 1, wherein the constriction formed on the claw is configured by opposing semicircular punches formed continuously at the cut portions on both sides. 5.

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