JP2018116953A - Circuit board storage case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit board storage case in which an adhesive is filled between an engaging groove and an engaging wall and that can suppress uneven distribution of the adhesive.SOLUTION: A circuit board storage case 1 includes a case body 5 having an opening 5a and a lid body 6 for closing the opening 5a of the case body 5, and an engaging groove 55 is provided along the periphery of the opening 5a in the case body 5, and an engaging wall 65 to be inserted into the engaging groove 55 is erected on the lid body 6, and the circumferential cross-sectional shape of the engaging wall 65 is asymmetrical between the outside and the inside of the center line L3 passing through the center of the thickness of the engaging wall 65.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a circuit board housing case for housing a circuit board on which circuit components (for example, an on-vehicle radar) are mounted.

  A conventional circuit board housing case (for example, Patent Document 1) includes a first divided case and a second divided case. An engagement groove is provided on the periphery of the first divided case, and an engagement wall that is inserted into the engagement groove is provided on the periphery of the second divided case.

  The first divided case and the second divided case are assembled to each other in a state where the engagement groove is filled with an adhesive. In this assembled state, the adhesive filled in the engaging groove spreads over the entire gap between the engaging groove and the engaging wall, fixing the engaging groove and the engaging wall to each other, and engaging the engaging groove. And the gap between the engagement walls is sealed.

  However, in the conventional circuit board housing case, the relative arrangement between the engagement groove and the engagement wall may be displaced due to dimensional tolerances or assembly errors, or the engagement wall may be displaced from the engagement groove. May be inserted at an angle. As a result, when the engagement wall is inserted into the engagement groove, a portion where the adhesive is difficult to flow is generated in the gap between the engagement groove and the engagement wall. And since an adhesive agent is unevenly distributed by the clearance gap between an engaging groove and an engaging wall, an adhesive agent may protrude from the joint line of a 1st division | segmentation case and a 2nd division | segmentation case.

JP 2011-201348 A

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a circuit board housing case that can suppress uneven distribution of the adhesive in a circuit board housing case in which an adhesive is filled between the engaging groove and the engaging wall.

The present invention is a circuit board housing case for housing a circuit board, comprising: a first divided case having an opening; and a second divided case for closing the opening of the first divided case, The first split case is provided with an engaging groove along the periphery of the opening, and the second split case is provided with an engaging wall inserted into the engaging groove, and the engaging wall Is a circuit board housing case that is asymmetric between the outside and the inside of the center line passing through the center of the thickness of the engaging wall.
The circumferential sectional shape is a sectional shape of a section orthogonal to the circumferential direction.

  According to the present invention, the circumferential cross-sectional shape of the engagement wall is asymmetric between the outside and the inside of the center line passing through the center of the thickness of the engagement wall. The outer and inner cross-sectional portions can be formed differently from each other, and thus, of the entire gap between the engagement groove and the engagement wall, each of the gap outside the center line and the inner gap. The sizes can be adjusted independently of each other.

Therefore, among the gaps on the outer side and the inner side of the center line, the size of the gap on which the adhesive is relatively easy to flow is maintained, and the gap on which the adhesive is relatively difficult to flow is maintained. Can be adjusted to a size that allows the adhesive to flow sufficiently.
As a result, when the engagement wall is inserted into the engagement groove, the adhesive filled in the engagement groove can be spread over both the gap outside the center line and the gap inside. In other words, it is possible to prevent the adhesive from being unevenly distributed in one of the outer gap and the inner gap from the center line, and to prevent the adhesive from protruding outside from the one gap. Can do.

  In addition, as described above, among the cross-sectional shape portions on the outer side and the inner side of the center line in the circumferential cross-sectional shape of the engagement wall, only one cross-sectional shape portion can be independently formed into an appropriate shape. A decrease in strength of the engagement wall can be suppressed.

As an aspect of the present invention, the engagement wall may include side surfaces on both sides having different tip end heights, and inclined surfaces connected between the tip portions on the side surfaces on both sides. .
The inclined surface may be a flat surface or a curved surface. Further, the connection between the tip portions of the side surfaces on both sides of the engagement wall and the inclined surface may be direct connection or indirect connection through a chamfered surface or the like.

  According to the present invention, the heights of the tip portions of the side surfaces on both sides of the engaging wall are different from each other, so that the inclined surface connected between the tip portions is the higher tip portion of the tip portions. Inclined from the side toward the lower end. Therefore, when the engagement wall is inserted into the engagement groove, the gap on the side facing the inclined surface is the opposite side among the gaps between the side walls on both sides of the engagement groove and the engagement wall. Larger than the gap. As a result, the size of the gap on the opposite side can be maintained, and the gap on the side facing the inclined surface can be secured to a size that allows the adhesive to flow sufficiently.

Moreover, as an aspect of the present invention, the engagement wall is configured such that one of the connection portions between each of the side surfaces on both sides of the engagement wall and the tip portion is relative to the other connection portion. It may be formed on an inclined surface that is concave.
The inclined surface may be a flat surface or a curved surface.

  According to the present invention, the size of the gap in the vicinity of the other connecting portion (that is, the connecting portion that is not relatively recessed) of the entire gap between the engaging groove and the engaging wall is maintained. A gap in the vicinity of one connecting portion (that is, a connecting portion formed on the inclined surface) can be ensured to a size that allows the adhesive to sufficiently flow.

As an aspect of the present invention, the tip end portion of the inclined surface may be disposed closer to the other connecting portion than the center in the thickness direction of the engagement wall.
In addition, the front-end | tip part of an inclined surface is an edge part by the side of a front-end | tip part among the front-end | tip part side and the base end part side of an engagement wall.
By this invention, the clearance gap between said inclined surface and an engaging groove can be ensured more widely, and the fluidity | liquidity of an adhesive agent can be improved more.

Further, as an aspect of the present invention, the engagement wall may be inclined or misaligned to the side surface facing the inclined surface among the side surfaces on both sides of the engagement groove.
According to this invention, even if the engagement wall is inclined to the side of the side facing the inclined surface among the side surfaces on both sides of the engagement groove, the inclined surface causes the engagement groove to be interposed between the engagement groove and the engagement wall. Of these gaps, the gap on the side where the engagement wall is inclined or displaced can be secured to a size that allows the adhesive to flow sufficiently.

As an aspect of the present invention, the tip portions of the side surfaces on both sides of the engagement groove may be formed at different heights.
According to the present invention, among the side surfaces on both sides of the engagement groove, the height of the side surface on the side where the adhesive filled in the engagement groove does not protrude is maintained, and the adhesive filled in the engagement groove easily protrudes. The height of the side surface on the side can be ensured to a height at which the adhesive does not protrude.

  Further, as an aspect of the present invention, in the peripheral edge of the first divided case, the height of each of the outer portion outside the engaging groove and the inner portion inside is different from each other, and the engaging wall is In the second divided case, the second divided case is provided at a corresponding portion corresponding to the peripheral edge of the first divided case, and in the corresponding portion of the second divided case, an outer portion outside the engagement wall and an inner portion inside. Each height may be different from each other according to the height of each of the outer portion and the inner portion of the first split case.

  According to the present invention, when the height of each of the outer portion outside the engagement groove and the inner portion inside is different from each other at the peripheral edge of the first divided case (that is, at the tip of each of the side surfaces on both sides of the engagement groove). When the heights are different from each other), according to the difference, the height of each of the outer portion outside the engagement wall and the inner portion of the inner side in the corresponding portion of the second split case is different from each other. And the interval between the joints of the second divided case can be prevented from becoming too large.

  According to the present invention, in the circuit board housing case in which the adhesive is filled between the engaging groove and the engaging wall, the uneven distribution of the adhesive is suppressed, and the adhesive from the joint of the circuit board housing case is suppressed. An object of the present invention is to provide a circuit board housing case that suppresses protrusion.

The perspective view which shows the circuit board accommodation case which concerns on embodiment of this invention. The disassembled perspective view which shows a circuit board accommodation case. (A) is the perspective view which looked at the cover body from the back side, (b) is the perspective view which looked at the case main body from the opening part side. AA sectional drawing of FIG. The enlarged view which shows the range W of FIG.

An embodiment of the present invention will be described below with reference to the drawings.
With reference to FIGS. 1-5, the circuit board accommodation case 1 which concerns on this embodiment is demonstrated. In FIG. 4, a circuit board 3 and an electromagnetic shield member 4 described later are omitted for convenience of drawing.

<Overall configuration>
As shown in FIGS. 1 and 2, the circuit board housing case 1 is a case made of, for example, resin that can house the circuit board 3 on which circuit components constituting various functions are mounted. The circuit board 3 is housed in the circuit board housing case 1. In the state, for example, it is used by being fixed to a predetermined part of the vehicle.

  In this embodiment, the circuit board housing case 1 houses, for example, a rectangular circuit board 3 in a bottom view and an electromagnetic shield member 4 in a shallow bottom dish having a rectangular shape in a bottom view that shields the circuit board 3 from electromagnetic waves. . As the various functions described above, the circuit board 3 can be implemented with circuit components that constitute a short-range radar that measures the distance and direction to the object by emitting radio waves toward the object and measuring the reflected waves. It is.

  The circuit board housing case 1 includes, for example, a resin case body 5 (first divided case) having an opening 5a, and a resin lid body 6 (second divided case) that closes the opening 5a of the case body 5. And.

  As shown in FIGS. 3B and 4, the case main body 5 is formed in a shallow box shape having a rectangular shape in a bottom view and one surface opened, for example. More specifically, the case body 5 is provided on a plate-like bottom portion 51 having a rectangular shape in a bottom view, a peripheral wall portion 52 erected along the periphery of the bottom portion 51, and an outer peripheral surface of the peripheral wall portion 52. A plurality of (for example, three) fixing portions 53 that are fixed to a portion with fasteners (for example, screws), and a connector portion 54 that is provided on the outer peripheral surface of the peripheral wall portion 52 and to which a mating connector from the outside is connected. Yes. The connector part 54 is electrically connected to the circuit board 3 housed in the case body 5, and electrically connects the mating connector connected to the connector part 54 and the circuit board 3.

  An engagement groove 55 into which an engagement wall 65 (to be described later) of the lid 6 is inserted in the distal end surface of the peripheral wall portion 52 (that is, the end surface in the standing direction of the peripheral wall portion 52) extends over the entire circumferential direction of the peripheral wall portion 52. Is provided. The engaging groove 55 is filled with the adhesive 7 (see FIG. 5). The adhesive 7 fixes the case body 5 and the lid body 6 to each other and seals the joint between the case body 5 and the lid body 6.

  In the case body 5, the peripheral wall portion 52 and the bottom portion 51 form an accommodation recess in which the circuit board 3 is accommodated, and the opening of the accommodation recess is an opening 5 a. A plurality of boss portions 56 to which fasteners (for example, screws) for fixing the circuit board 3 and the electromagnetic shield member 4 are fastened are erected on the inner main surface of the bottom portion 51. The circuit board 3 and the electromagnetic shielding member 4 are accommodated inside the case body 5 (ie, inside the accommodation recess) in a state where they are overlapped with each other, and fastened together with the boss portions 56 with fasteners (for example, screws). As a result, it is fixed to the bottom 51.

  As shown in FIG. 3A and FIG. 4, the lid body 6 is formed in, for example, a shallow dish shape having a rectangular shape in a bottom view. More specifically, the lid 6 includes a plate-like bottom portion 61 that is rectangular in a bottom view and a peripheral wall portion 62 that is erected along the periphery of the bottom portion 61. An engagement wall 65 inserted into the engagement groove 55 of the case body 5 stands on the front end surface of the peripheral wall portion 62 (that is, the end surface of the peripheral wall portion 62 in the standing direction) over the entire peripheral direction of the peripheral wall portion 62. It is installed.

  As shown in FIG. 4, when the case body 5 and the lid body 6 are assembled to each other, the lid body 6 closes the opening 5 a of the case body 5 and the front end surface of the peripheral wall portion 62 of the lid body 6 is The engagement wall 65 of the lid body 6 is inserted into the engagement groove 55 of the case body 5 by being brought into contact with the front end surface of the case body 5. In this inserted state, a gap S (see FIG. 5) is secured between the engagement groove 55 and the engagement wall 65, and the adhesive 7 filled in the engagement groove 55 spreads over the entire gap S. As a result, the case body 5 and the lid body 6 are fixed to each other by the adhesive 7 and the joint between the case body 5 and the lid body 6 is sealed.

<Engagement groove 55 and engagement wall 65>
With reference to FIG. 5, the engagement groove 55 and the engagement wall 65 will be described in detail.
As described above, the engagement groove 55 is provided in, for example, the flat front end surface of the peripheral wall portion 52 of the case body 5, and the engagement groove 55 is provided in, for example, the flat front end surface of the peripheral wall portion 62 of the lid body 6. An engaging wall 65 to be inserted is erected.

In the circuit board housing case 1, the standing direction L1 of the engagement wall 65 is set to the side surfaces on both sides of the engagement wall 65 (that is, the outer side surface 65a and Even when the inner side surface 65b is inclined toward one of the side surfaces, the adhesive 7 filled in the engaging groove 55 is applied to the entire gap S between the engaging groove 55 and the engaging wall 65 (see FIG. That is, the engagement wall 65 is formed so as to spread over not only the side opposite to the side where the engagement wall 65 is inclined but also the side where the engagement wall 65 is inclined.
In the following description, as an example, a case where the standing direction L1 of the engagement wall 65 is inclined toward the inner side surface 65b of the engagement wall 65 with respect to the insertion direction L2 will be described as an example.

  First, the engagement groove 55 will be described. The circumferential cross-sectional shape of the engaging groove 55 (that is, the cross-sectional shape of the cross section orthogonal to the circumferential direction) is substantially U-shaped. That is, in the engaging groove 55, each connecting portion between each side surface (that is, the outer side surface 55a and the inner side surface 55b) and the bottom portion 55c is formed by chamfering in an arc shape, for example. In this embodiment, each connecting portion is chamfered in an arc shape, but may be sharpened in a concave corner shape.

  Next, the engagement wall 65 will be described. The cross-sectional shape in the circumferential direction of the engaging wall 65 (that is, the cross-sectional shape of the cross section orthogonal to the circumferential direction) is asymmetric between the outside and the inside of the center line L3. The center line L3 is a straight line that passes through the center of the thickness of the engagement wall 65 and is parallel to the standing direction L1 of the engagement wall 65.

  More specifically, the engagement wall 65 is one of the connection portions 65d and 65e between the side surfaces 65a and 65b on both sides of the engagement wall 65 and the tip portion 65c (that is, the engagement wall 65). 65d is formed on an inclined surface that is chamfered so as to be recessed relative to the other connecting portion 65e. Hereinafter, it is also referred to as an inclined surface 65d. The inclined surface 65d is inclined from the inner side surface 65b of the engagement wall 65 toward the outer side surface 65a toward the distal end portion 65c of the engagement wall 65.

  In this embodiment, one connecting portion (that is, the inclined surface) 65d is formed in, for example, a flat shape, and the other connecting portion 65e is formed in, for example, a chamfered shape in a convex curved surface. One connecting portion 65d may have a curved surface shape, and the other connecting portion 65e may have a convex corner shape.

  The distal end portion of the inclined surface 65d (that is, the end portion on the distal end portion 65c side of the engagement wall 65) 65d1 is disposed, for example, on the other connecting portion 65e side with respect to the center line L3. For example, the proximal end portion 65d2 of the inclined surface 65d (that is, the distal end portion 65b1 of the inner side surface 65b of the engagement wall 65) is closer to the proximal end portion side of the engagement wall 65 than the distal end portion 65a1 of the outer side surface 65a of the engagement wall 65. (In other words, it is disposed on the opposite side of the standing direction L1).

  That is, in this embodiment, the heights of the tip portions 65a1 and 65b1 of the side surfaces 65a and 65b on both sides of the engagement wall 65 are different from each other, and the inclined surface 65d is connected between the tip portions 65a1 and 65b1. Yes. Note that the distal end portion 65a1 and the inclined surface 65d of the outer side surface 65a of the engagement wall 65 are indirectly connected, for example, via an arc-shaped connection portion 65e, and the distal end portion 65b1 of the inner side surface 65b of the engagement wall 65 is connected. The inclined surface 65d is directly connected.

  Further, the heights of the tip portions 65a1 and 65b1 of the side surfaces 65a and 65b on both sides of the engagement wall 65 are different from each other, or the tip portion 65d1 of the inclined surface 65d is on the other connecting portion 65e side of the center line L3. Or the like, the inclinations of the connecting portions 65d and 65e are independently adjusted.

  Further, the base end portion 65d2 of the inclined surface 65d is disposed, for example, near the center of the height of the engagement wall 65. In this embodiment, the heights of the base end portions 65a2 and 65b2 of the side surfaces 65a and 65b on both sides of the engaging wall 65 are different from each other. In this case, the height of the engaging wall 65 is the engaging wall. Out of the base end portions 65a2 and 65b2 of the side surfaces 65a and 65b on both sides of the 65, the base end portion 65b2 that is relatively shifted to the opposite side of the standing direction L1 to the front end portion 65c of the engagement wall 65 It is the length along the direction L1.

  Returning to the description of the engagement groove 55, in this embodiment, one of the side surfaces 55a and 55b on both sides of the engagement groove 55 (that is, the side surface on which the engagement wall 65 is inclined, that is, the inner side surface) 55b. The front end portion 55b1 is formed higher than the front end portion 55a1 of the other side surface (that is, the outer side surface) 55a. In other words, on the front end surface of the peripheral wall portion 52 of the case body 5, one of the outer portion 52 a outside the engagement groove 55 and the inner portion 52 b inside (that is, the side on which the engagement wall 65 is inclined). The portion (ie, the inner portion) 52b is formed higher than the other portion (ie, the outer portion) 52a.

  Accordingly, of the side surfaces 65a and 65b on both sides of the engagement wall 65, the base end portion 65b2 of one side surface (that is, the side surface on which the engagement wall 65 is inclined, that is, the inner side surface) 65b is the other side surface. That is, it is formed higher than the base end portion 65a2 of the outer side surface 65a. In other words, at the front end surface of the peripheral wall portion 62 of the lid body 6, one of the outer portion 62 a outside the engagement wall 65 and the inner portion 62 b inside (that is, the side on which the engagement wall 65 is inclined). The portion (ie, the inner portion) 62b is formed higher than the other portion (ie, the outer portion) 62a.

  In this embodiment, the front end 55a1 (55b1) side of the outer side surface 55a (inner side surface 55b) of the engagement groove 55 is bent toward the outer peripheral side (inner peripheral side) of the engagement groove 55, for example, The front end portion 55a1 (55b1) of the side surface 55a (inner side surface 55b) is a portion connected to the outer portion 52a (inner portion 52b) of the flat front end surface of the peripheral wall portion 52, for example.

  In this embodiment, the base end portions 65a2 and 65b2 side of the outer side surface 65a (inner side surface 65b) of the engagement wall 65 are bent toward the outer peripheral side (inner peripheral side) of the engagement wall 65, and the outer side surface 65a. The base end portion 65a2 (65b2) of the (inner side surface 65b) is a portion connected to the outer portion 62a (inner portion 62b) of the flat distal end surface of the peripheral wall portion 62, for example. Moreover, the front-end | tip part 65a1 (65b1) of the outer side surface 65a (inner side surface 65b) of the engagement wall 65 is made into the part connected to the connection part 65e (65d).

Next, a method for assembling the case body 5 and the lid body 6 will be described in detail.
First, an appropriate amount of the adhesive 7 is filled in the engagement groove 55 of the case body 5. The appropriate amount is an amount that does not protrude from the joint between the case body 5 and the lid body 6 in a state where the adhesive 7 has spread over the entire gap S between the engagement groove 55 and the engagement wall 65.

  Then, with the lid 6 facing the front of the opening 5a of the case body 5, the lid 6 is relative to the opening 5a of the case body 5 along the facing direction L5 (that is, the insertion direction L2). 2 (see FIG. 2), the front end surface of the peripheral wall portion 62 of the lid body 6 and the front end surface of the peripheral wall portion 52 of the case body 5 are brought into contact with each other, and the engagement wall 65 of the lid body 6 is engaged with the case body 5. It is inserted into the joint groove 55 (FIGS. 4 and 5). As a result, the lid 6 is assembled to the opening 5 a of the case body 5.

  At the time of this assembly, in this embodiment, the engagement wall 65 is inserted into the engagement groove 55 in a state where the standing direction L1 is inclined toward the inner side surface 55b of the engagement groove 55 with respect to the insertion direction L2. However, since the connecting portion 65d on the inner side of the engaging wall 65 is an inclined surface, the clearance Sc between the connecting portion (that is, the inclined surface) 65d of the engaging wall 65 and the inner side surface 55b of the engaging groove 55 is sufficient. The engagement wall 65 is inserted into the engagement groove 55 in a state where the size (that is, the size that allows the adhesive 7 to flow) is ensured. Accordingly, the engagement wall 65 is inserted into the engagement groove 55 in a state in which the gaps between the side surfaces 55a and 55b on both sides of the engagement groove 55 and the engagement wall 65 are secured to a sufficient size.

  As a result, as the engaging wall 65 is inserted into the engaging groove 55, the adhesive 7 filled in the engaging groove 55 is applied to the entire gap S between the engaging groove 55 and the engaging wall 65 ( That is, it extends not only to the side opposite to the side where the engagement wall 65 is inclined, but also to the side where the engagement wall 65 is inclined.

  Further, in this embodiment, since the standing direction L1 of the engagement wall 65 is inclined toward the inner side surface 55b of the engagement groove 55, the entire clearance S between the engagement groove 55 and the engagement wall 65 is reduced. Of these, the gap Sb facing the inner side surface 65b of the engagement wall 65 is relatively narrower (that is, the gap volume is smaller) than the gap Sa facing the outer side surface 65a of the engagement wall 65. For this reason, the gap Sb facing the inner side surface 65b of the engagement wall 65 reaches the position where the adhesive 7 is higher than the gap Sa facing the outer side surface 65a of the engagement wall 65. However, in this embodiment, the height of the front end portion 55b1 of the inner side surface 55b of the engagement groove 55 is higher than the height of the front end portion 55a1 of the outer side surface 55a of the engagement groove 55. Of the inner side surface 55b is prevented from protruding from the joint (that is, the joint between the lid 6 and the case body 5).

<Main effects>
As described above, according to the circuit board housing case 1 according to this embodiment, the case main body 5 (first divided case) having the opening 5a and the lid 6 (second divided case) that closes the opening 5a of the case main body 5 are provided. The case body 5 is provided with an engagement groove 55 along the periphery of the opening 5a (that is, the front end surface of the peripheral wall portion 52), and the lid body 6 is inserted into the engagement groove 55. The engagement wall 65 is erected, and the circumferential cross-sectional shape of the engagement wall 65 is asymmetric between the outside and the inside of the center line L3 passing through the center of the thickness of the engagement wall 65.

  With this configuration, the circumferential cross-sectional shape of the engagement wall 65 is asymmetric between the outside and the inside of the center line L3 passing through the center of the thickness of the engagement wall 65. The cross-sectional shape portions on the outer side and the inner side of the center line L3 can be formed differently from each other, whereby the gap S between the engagement groove 55 and the engagement wall 65 is outside and on the inner side of the center line L3. The size of each gap can be adjusted independently of each other.

  Therefore, among the gaps outside and above the center line L3, the size of the gap where the adhesive 7 is relatively easy to flow is maintained, and the adhesive 7 is relatively difficult to flow. This gap can be adjusted to a size that allows the adhesive 7 to flow sufficiently.

  As a result, when the engagement wall 65 is inserted into the engagement groove 55, the adhesive 7 filled in the engagement groove 55 is spread over both the outer gap and the inner gap than the center line L3. be able to. In other words, it is possible to prevent the adhesive 7 from being unevenly distributed in one of the outer gap and the inner gap from the center line L3, and the adhesive 7 protrudes outside from the one gap. Can be suppressed.

  Further, as described above, only one of the cross-sectional shape portions on the outer side and the inner side of the center line L3 in the circumferential cross-sectional shape of the engagement wall 65 is independently formed in an appropriate shape. Therefore, a decrease in strength of the engagement wall 65 can be suppressed.

  Further, the engaging wall 65 has inclined surfaces 65d connected between the side surfaces 65a and 65b on both sides where the heights of the tip portions 65a1 and 65b1 are different from each other and the tip portions 65a1 and 65b1 of the side surfaces 65a and 65b on both sides. Therefore, the inclined surface 65d connected between the tip portions 65a1 and 65b1 is inclined from the higher tip portion side to the lower tip portion side of the tip portions 65a1 and 65b1. ing.

  Therefore, when the engagement wall 65 is inserted into the engagement groove 55, the inclined surface 65 d of the gap between each of the side surfaces 55 a and 55 b on both sides of the engagement groove 55 and the engagement wall 65 is The gap on the facing side is larger than the gap on the opposite side. As a result, the size of the gap on the opposite side can be maintained, and the gap on the side facing the inclined surface 65d can be secured to a size that allows the adhesive 7 to flow sufficiently.

  Further, the engaging wall 65 has one connecting portion (for example, 65d) among the connecting portions 65e and 65d between the distal end portion 65c of the engaging wall 65 and the side surfaces 65a and 65b on both sides, and the other of them. Since it is formed in the inclined surface relatively recessed rather than the connection part (for example, 65e), said other connection part (namely, relative) among the whole clearance gaps between the engagement groove | channel 55 and the engagement wall 65 is formed. The connecting portion not recessed) is maintained in the size of the gap in the vicinity of 65e, and the adhesive 7 can sufficiently flow through the gap in the vicinity of the one connecting portion (that is, the connecting portion formed on the inclined surface) 65d. The size can be adjusted.

  Further, the tip 65d1 of the inclined surface 65d is disposed on the side of the other connecting portion 65e with respect to the center of the engaging wall 65 in the thickness direction, and therefore, between the inclined surface 65d and the engaging groove 55. A wider gap can be secured, and the fluidity of the adhesive 7 can be further improved.

  In addition, the engagement wall 65 is inclined toward the side surface 55b facing the inclined surface 65d among the side surfaces 55a and 55b on both sides of the engagement groove 55. Even in such a case, the engagement wall 65 is engaged by the inclined surface 65d. Of the entire gap between the joint groove 55 and the engagement wall 65, the gap on the side where the engagement wall 65 is inclined can be adjusted to a size that allows the adhesive 7 to flow sufficiently.

  Moreover, since the front end portions 55a1 and 55b1 of the side surfaces 55a and 55b on both sides of the engagement groove 55 are formed at different heights, of the side surfaces 55a and 55b on both sides of the engagement groove 55, Maintaining the height of the tip 55a1 of the side surface 55a on the side where the adhesive 7 filled in the groove 55 does not protrude (for example, the side opposite to the side where the engaging wall 65 is inclined) is filled in the engaging groove 55 The height of the front end portion 55b1 of the side surface 55b on the side where the adhesive 7 is easy to protrude (for example, the side on which the engaging wall 65 is inclined) can be adjusted to a height at which the adhesive 7 does not protrude.

  Further, at the periphery of the case body 5 (first divided case) (that is, the front end surface of the peripheral wall portion 52), the heights of the outer portion 52a outside the engagement groove 55 and the inner portion 52b inside are different from each other. The engagement wall 65 is provided in a corresponding portion corresponding to the peripheral edge of the case body 5 (that is, the front end surface of the peripheral wall portion 62) in the lid body 6 (second divided case). The heights of the outer portion 62a and the inner portion 62b outside the engagement wall 65 are different from each other depending on the heights of the outer portion 52a and the inner portion 52b of the case body 5.

  With this configuration, when the heights of the outer portion 52a outside the engagement groove 55 and the inner portion 52b inside the engagement groove 55 are different from each other at the periphery of the case body 5 (that is, the side surfaces 55a and 55b on both sides of the engagement groove 55). When the heights of the respective front end portions 55a1 and 55b1 are different from each other), according to the difference, each of the portion 62a outside the engagement wall 65 and the inner portion 62b inside the corresponding portion of the lid body 6 Since the heights are different from each other, it is possible to prevent the interval between the joints of the case body 5 and the lid body 6 from becoming too large.

<Modification>
In the above-described embodiment, the case where the standing direction L1 of the engaging wall 65 is inclined toward the inner side surface 55b of the engaging groove 55 has been described as an example. When the engaging groove 55 is inclined toward the outer side surface 55a, an inclined surface is provided at the connecting portion 65e instead of the connecting portion 65d. Also in this case, the same effect as the above embodiment is obtained.

  In the above embodiment, the case where the standing direction L1 of the engaging wall 65 is inclined has been described as an example. However, instead of the tilting direction L1 of the engaging wall 65 being inclined, the engaging wall 65 When 65 is displaced from the center in the width direction of the engagement groove 55 to the outer side surface 65a side or the inner side surface 65b side of the engagement wall 65, the engagement wall among the connecting portions 65d and 65e. An inclined surface is provided at the connecting portion on the side where 65 is displaced. Also in this case, the same effect as the above embodiment is obtained.

  The present invention is not limited to the configurations of the above-described embodiments and modifications, and includes combinations of the above-described embodiments and modifications.

DESCRIPTION OF SYMBOLS 1 ... Circuit board storage case 5 ... Case main body (1st division | segmentation case)
5a ... Opening 6 ... Lid (second divided case)
52a ... Outer part of the periphery of the case body 52b ... Inner part of the periphery of the case body 55 ... Engagement groove 55a, 55b ... Side surface 55a1, 55b1 ... Side end portion 65 ... Engagement wall 65a, 65b ... Side surface 65c ... Tip portion 65d ... articulated part (slope)
65e ... articulated part 65a1, 65b1 ... tip part of side face 62a ... outer part of corresponding part of lid body 62b ... inner part of corresponding part of lid body L3 ... center line

Claims (7)

A circuit board housing case for housing a circuit board,
A first split case having an opening, and a second split case for closing the opening of the first split case;
The first split case is provided with an engaging groove along the periphery of the opening.
The second split case is provided with an engaging wall to be inserted into the engaging groove,
A circuit board housing case in which a circumferential cross-sectional shape of the engagement wall is asymmetric between an outer side and an inner side of a center line passing through the center of the thickness of the engagement wall. 2. The circuit board housing case according to claim 1, wherein the engagement wall has side surfaces on both sides having different tip end heights and an inclined surface connected between the tip portions of the side surfaces on both sides. . The engaging wall is formed on an inclined surface in which one connecting portion of each connecting portion between each side surface of the engaging wall and the tip portion is relatively recessed with respect to the other connecting portion. The circuit board housing case according to claim 1. 4. The circuit board housing case according to claim 3, wherein a tip end portion of the inclined surface is disposed closer to the other connecting portion than a center of a thickness of the engaging wall. 5. The circuit board according to claim 2, wherein the engagement wall is inclined or displaced toward a side surface facing the inclined surface among side surfaces on both sides of the engagement groove. 6. Containment case. 6. The circuit board housing case according to claim 1, wherein the front ends of the side surfaces on both sides of the engaging groove are formed at different heights. 7. In the peripheral edge of the first split case, the height of each of the outer part outside the engagement groove and the inner part inside is different from each other,
The engaging wall is provided in a corresponding portion corresponding to the peripheral edge of the first divided case in the second divided case,
In the corresponding portion of the second split case, the height of each of the outer portion outside the engagement wall and the inner portion inside is equal to the height of each of the outer portion and the inner portion of the first split case. 7. The circuit board housing case according to claim 1, wherein the circuit board housing cases are different from each other.

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