Electronic device

Abstract

To provide an electronic device in which excessive load applied to structure for fixing a substrate can be suppressed.SOLUTION: An electronic device 1 comprises: a case main body 10; a circuit board 40; and a cover body 50. The case main body 10 includes a pair of support pieces 19 standing from a bottom plate 11 and is faced each other. The circuit board 40 is supported over the pair of support pieces 19. In each support piece 19, a first latching portion 29 latching and holding the circuit board 40 is provided. The cover body 50 includes: a top plate 51; and a pair of cover side walls 59 hooked from a side end edge of the top plate 51. Each cover side wall 59 is latched to and overlapped onto an outer surface side of each support piece 19 on an open side of the case main body 10 from the first latching portion 29.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to electronic devices. [Background technology]

[0002] Conventionally, electronic devices constituting controllers of electronic devices and the like are known (see, for example, Patent Document 1). Patent Document 1 discloses a security device that includes a case composed of a bottom plate and side walls rising from the bottom plate, a board placed inside the case, and elastic engagement claws that elastically deform in the thickness direction of the side walls to perform a snap-fit ​​connection with one side of the board. With this configuration, the adoption of the elastic engagement claws allows the board to be attached to the case without using parts such as screws. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-251644 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the boards of the electronic device as described above are sometimes produced by cutting out a number of pieces from a single plate-shaped board material, and depending on the cutting method, the dimensions of each board may vary. In this case, if the dimensions vary to the larger side, the elastic engagement claws that are connected to the boards will deform more than expected, and the side walls of the case that support the elastic engagement claws will bulge. In this case, the side walls will try to deform so as to tilt outward from the boundary between the side walls and the bottom plate, i.e., the base of the side walls, as a starting point, and excessive load will be concentrated at the base, reducing the durability of the electronic device.

[0005] An object of the present invention is to provide an electronic device that prevents an excessive load from being applied to a structure for fixing a substrate. [Means for solving the problem]

[0006] In order to solve the above problems and achieve the above objects, an electronic device is provided that includes a case body having a bottom plate and opening in a direction opposite the bottom plate, a circuit board accommodated in the case body, and a cover body covering the opening of the case body, wherein the case body has a pair of support pieces that rise from the bottom plate and face each other, the circuit board is supported across the pair of support pieces, and the pair of support pieces are provided with first engagement portions that protrude inward and are elastically deformable in the thickness direction of the support pieces to engage and hold the circuit board, and the cover body has a top plate that faces the circuit board and a pair of cover side walls that hang down from the side edges of the top plate, and the cover side walls are engaged by overlapping the outer surface side of the support pieces on the opening side of the case body relative to the first engagement portions.

[0007] According to the present invention, even if the dimensions of the circuit board accommodated in the case body vary and the first locking portion and the support piece are about to deform more than expected, the cover side wall overlaps and locks with the outer surface side of the support piece on the opening side of the case body closer to the first locking portion. Therefore, the tip of the support piece is restricted from displacement by the cover side wall, and the support piece is less likely to tilt outward from the base part of the support piece on the bottom plate side. This makes it possible to prevent excessive load from concentrating on the base part of the support piece. Therefore, it is possible to provide an electronic device that prevents excessive load from being applied to the structure for fixing the board.

[0008] In this case, it is preferable that the first locking portion has an elastic piece that is provided by cutting out the support piece in the plate thickness direction and is elastically deformable in the plate thickness direction of the support piece, and a retaining claw that is provided by protruding inward from the elastic piece. According to this configuration, since the elastic piece is provided by cutting out the support piece of the case body, the amount of protrusion of the first locking portion from the case body can be reduced compared to a case in which the elastic piece is configured separately from the support piece, and the case body can be made smaller accordingly.

[0009] Moreover, it is preferable that the pair of support pieces are provided with second locking portions that protrude outward and are elastically deformable in the plate thickness direction of the support pieces to lock and hold the cover side walls. According to this configuration, the force generated when the first locking portion is pressed from the inside to the outside by the inner circuit board and elastically deforms is transmitted to the second locking portion via the support pieces, and the second locking portion is pressed against the cover side walls by the force. That is, the force applied to the first locking portion is applied to the second locking portion. On the other hand, the force generated when the second locking portion is pressed from the outside to the inside by the outer cover side wall and elastically deforms is transmitted to the first locking portion via the support pieces, and the first locking portion is pressed against the circuit board by the force. That is, the force applied to the second locking portion is applied to the first locking portion. In this way, by making the protruding directions of the first and second locking portions different on the inside and outside of the support piece, the forces applied to the first and second locking portions can be added to each other, thereby improving the holding force of the first and second locking portions.

[0010] It is also preferable that the pair of support pieces have a tip portion on the case body opening side, a base portion on the case body bottom plate side, and a step portion provided at the boundary between the tip portion and the base portion, the cover body is detachably provided to the case body in the plate thickness direction of the circuit board, the second locking portion is provided at the tip portion, and the position of the cover body is restricted by the hanging edge of the cover side wall abutting against the step portion. According to this configuration, the step portion constituting the boundary between the tip portion and the base portion of the support piece can be used as a structure when the hanging edge of the cover side wall abuts against the step portion to restrict the position of the cover body. Therefore, it is possible to position the cover body relative to the case body with a simple structure without attaching a special structure such as a stopper to the case body.

[0011] In addition, it is preferable that the cover body has a restricting surface provided inward from the pair of cover side walls, and the restricting surface is restricted in position by abutting or coming close to the inner surface of the support piece. With this configuration, the restricting surface of the cover body overlaps the inner surface of the support piece, so that the cover side walls overlap the outer surface of the support piece and the support piece can be prevented from falling inward due to being pressed by the cover side walls when the case body and the cover body are combined. Effect of the Invention

[0012] According to the present invention, it is possible to provide an electronic device that prevents an excessive load from being applied to a structure for fixing a substrate. [Brief description of the drawings]

[0013] [Figure 1] 1 is a perspective view showing an assembled state of an electronic device according to a first embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 2 is a perspective view of a case body constituting the electronic device. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 2 is a top view of a substrate constituting an electronic device. [Figure 7] FIG. 4 is a diagram showing the distance between the substrate and the case body. [Figure 8] 6 is a cross-sectional view of the electronic device taken along line AA in FIG. 5. [Figure 9] FIG. 9 is an enlarged view of a main portion of region A in FIG. 8 . [Figure 10] FIG. 2 is a perspective view of the electronic device with the terminal block removed. [Figure 11] FIG. 11 is a front view of the electronic device in FIG. 10 . [Figure 12] FIG. 11 is a perspective view of an electronic device according to a second embodiment. [Figure 13] 13 is a top view of the electronic device in FIG. 12. [Figure 14]FIG. 4 is a top view of the protective cover attached to the case body. [Figure 15] 4A is an enlarged view of a main portion showing one of the fixing holes provided in the case body, and FIG. 4B is an enlarged view of a main portion showing the other fixing hole. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, a first embodiment of the present invention will be described with reference to Figs. 1 to 11. The electronic device 1 according to the first embodiment is used as a controller for an electric valve such as an electronic expansion valve that constitutes a refrigeration cycle. As shown in Fig. 1, the electronic device 1 includes a case body 10, a circuit board 40, and a cover body 50. In the following description, the plate thickness direction of the circuit board 40 is the height direction, and is referred to as the "height direction Z". One side of the height direction Z is referred to as the "upper side Z1", and the other side is referred to as the "lower side Z2". One side of the surface extension direction of the circuit board 40 perpendicular to the height direction Z is referred to as the front-rear direction X (predetermined direction), and the other side is referred to as the left-right direction Y (orthogonal direction). One side of the front-rear direction X is referred to as the "front side X1", and the other side is referred to as the "rear side X2". One side of the left-right direction Y is referred to as the "right side Y1", and the other side is referred to as the "left side Y2".

[0015] Note that the definitions of these directions are merely for convenience of explanation, and do not necessarily coincide with the directions in the actual use state of the electronic device 1, and do not limit the directions of the electronic device 1. For example, in the actual use state of the electronic device 1, the lower side Z2 part in Fig. 1 becomes the back side of the electronic device 1 and is attached to the attachment target, and the upper side Z1 part becomes the front side. In this case, the front-to-rear direction X in Fig. 1 becomes the up-down direction, and for example, the front side X1 in Fig. 1 may actually be the lower side, and the rear side X2 in Fig. 1 may actually be the upper side.

[0016] As shown in FIG. 2, the case body 10 is formed into a box shape that opens to the upper side Z1 by resin molding or the like. The case body 10 includes a rectangular bottom plate 11 having a long side in the left-right direction Y. The surface of the upper side Z1 of the bottom plate 11 constitutes a surface that supports the circuit board 40, and has a mounting surface 12 in the center in the front-rear direction X as shown in FIG. 3. The mounting surface 12 is formed into a rectangular shape having a long side in the left-right direction Y. Support protrusions 13 that rise to the upper side Z1 are formed at the four corners of the mounting surface 12, and protruding ends 13a of the support protrusions 13 abut against the surface of the lower side Z2 of the circuit board 40 to support the circuit board 40 upward. As shown in FIG. 4, the surface of the lower side Z2 of the bottom plate 11 constitutes an attachment surface 14 for attaching the electronic device 1 to an attachment target. An attachment groove 15 that opens to the lower side Z2 is formed in the center of the attachment surface 14 in the front-rear direction X. The mounting groove 15 is formed in the left-right direction Y from the right end Y1 of the mounting surface 14 to the left end Y2 of the mounting surface 14, and is fitted into a rail (not shown) to be mounted.

[0017] A guide groove 16 is formed in the center of the mounting groove 15 in the left-right direction Y, which is connected to the mounting groove 15 and extends to the end of the front side X1 of the mounting surface 14. A substantially rectangular DIN rail locking member 17 is installed in the guide groove 16 and is supported so as to be movable forward and backward in the front-rear direction X. When the DIN rail locking member 17 is displaced to the front side X1, the electronic device 1 can move in the left-right direction Y on the rail to be mounted via the mounting groove 15 fitted into the rail. On the other hand, when the DIN rail locking member 17 is displaced to the rear side X2, the end of the rear side X2 of the DIN rail locking member 17 presses the rail, locking the electronic device 1 on the rail and making it impossible to displace the electronic device 1 on the rail. With this configuration, the position of the electronic device 1 on the rail can be changed arbitrarily. A punched hole 18 is formed at each of the left and right end portions at the front and rear end edges of the mounting groove 15, penetrating in the height direction Z. The die removal hole 18 is a hole for removing a die when forming a first locking portion 29 described later, and is formed at a position corresponding to a lower side Z2 portion of the first locking portion 29.

[0018] As shown in FIG. 2, a pair of support pieces 19 are formed on both left and right end edges of the bottom plate 11, rising to the upper side Z1 and facing each other in the left-right direction Y. The support pieces 19 are side walls that support the circuit board 40 from the left-right direction Y. The support pieces 19 are formed with first rails 20 (ribs) that protrude inward. The first rails 20 are located in first grooves 41a of the circuit board 40, which will be described later, and serve as a portion that guides the attachment of the circuit board 40 to the case body 10. In this embodiment, the first rails 20 are formed on the edges of the front side X1 and the rear side X2 of each of the support pieces 19 on the right side Y1 and the left side Y2, protrude inward in the left-right direction Y, and extend in the height direction Z. The width dimension of the first rails 20 in the left-right direction Y increases toward the lower side Z2.

[0019] A second rail 31 is formed at the center of the inner surface of the support piece 19 on the left side Y2 in the front-rear direction X, protruding inward in the left-right direction Y and extending in the height direction Z. The dimension of the second rail 31 in the left-right direction Y is constant throughout the height direction Z. The second rail 31 is located in a second groove 41b of the circuit board 40 described later, and guides the mounting of the circuit board 40 to the case body 10. Since the second rail 31 is formed only on the support piece 19 on the left side Y2, the circuit board 40 is accommodated in the case body 10 only in the orientation in which the second rail 31 fits into the second groove 41b. This prevents the circuit board 40 from being accommodated in the case body 10 in the wrong orientation.

[0020] In this embodiment, the first rail 20 is formed on the edge of the front side X1 and the edge of the rear side X2 of each of the support pieces 19 on the right side Y1 and the left side Y2, but the present invention is not limited to this and the first rail 20 may be formed at any location of the support piece 19. In addition, in this embodiment, the dimension of the second rail 31 in the left-right direction Y is constant over the height direction Z, but the dimension in the left-right direction Y may be increased toward the lower side Z2, similar to the first rail 20. In addition, the second rail 31 does not necessarily have to be formed in one piece at the center in the front-rear direction X of the inner surface of the support piece 19 on the left side Y2, and one or more second rails 31 may be formed at any location of the inner surface of the support piece 19 on the left side Y2, or one or more second rails 31 may be formed at any location of the support piece 19 on the right side Y1. In addition, when forming second rails 31 on the support pieces 19 on both the left and right sides, it is preferable to make the number of second rails 31 different on the right side Y1 and the left side Y2 so that the orientation of the circuit board 40 housed in the case body 10 is limited to one orientation.

[0021] The support piece 19 includes a lower wall portion 21 (root portion) constituting a lower side Z2 (case body bottom plate side) portion, and an upper wall portion 22 (tip portion) constituting an upper side Z1 (case body opening side) portion. The outer surface of the lower wall portion 21 is located outward in the left-right direction Y than the outer surface of the upper wall portion 22 (i.e., the outer surface of the upper wall portion 22 is located inward in the left-right direction Y than the outer surface of the lower wall portion 21), so that a step portion 23 extending in the left-right direction Y from the outer surface of the lower wall portion 21 to the outer surface of the upper wall portion 22 is formed at the boundary between the lower wall portion 21 and the upper wall portion 22. The lower wall portion 21 is formed with a plate-shaped extension portion 24 protruding outward in the front-rear direction X.

[0022] In this embodiment, a pair of extensions 24 are formed at the front and rear of the lower wall 21, one of which protrudes from an edge of the front side X1 of the lower wall 21 to the front side X1 and extends to the front side X1 beyond the front edge of a partition wall 52 (side wall) of the front side X1 of the cover body 50 described later, and the other protrudes from an edge of the rear side X2 of the lower wall 21 to the rear side X2 and extends to the rear side X2 beyond the rear edge of the partition wall 52 (side wall) of the rear side X2 of the cover body 50. A fixing hole 25 is formed penetrating the upper part of the extension 24 in the plate thickness direction. The fixing hole 25 is a through hole for fixing a protective cover 70 described later. The fixing hole 25 is formed at a position lower Z2 than the step 23, lower Z2 than a connector insertion hole 57 described later, and upper Z1 than a screw terminal block 42a and a screwless terminal block 42b described later in order to avoid interference with components attached to the electronic device 1.

[0023] The protective cover 70 can be omitted, and in the first embodiment, the electronic device 1 omits the protective cover 70. A generally rectangular recess 26 recessed inward in the left-right direction Y is formed in the center of the lower wall 21. The bottom surface of the recess 26 is located furthest inward in the left-right direction Y among the outer surfaces of the support pieces 19. As a result, the lower wall 21 includes a first wall 27 whose outer surface constitutes the outermost surface of the case body 10, and a second wall 28 in which the recess 26 is formed and which is recessed inward from the first wall 27. A first locking portion 29 that locks and holds the circuit board 40 is formed in the second wall 28.

[0024] The first locking portion 29 is a so-called snap fit, and is formed by cutting out the second wall portion 28 (i.e., the support piece 19) in a substantially U-shaped manner in the plate thickness direction, and is elastically deformable in the left-right direction Y. The first locking portion 29 includes a first elastic piece 29a (elastic piece) that is elastically deformable in the left-right direction Y, and a first holding claw 29b (holding claw) that is tapered and provided to protrude inward from the inner surface of the first elastic piece 29a. In this embodiment, two first locking portions 29 are provided spaced apart in the front-rear direction X. Specifically, the first locking portions 29 are formed at both front and rear ends of the second wall portion 28. However, the number and arrangement of the first locking portions 29 are not limited to this, and the number and arrangement can be changed as appropriate.

[0025] The upper wall portion 22 is formed with a second locking portion 30 for locking and holding a cover side wall 59 described later. Similar to the first locking portion 29, two second locking portions 30 are provided spaced apart in the front-rear direction X. Specifically, the second locking portions 30 are formed at both front and rear ends of the upper wall portion 22. Similar to the first locking portion 29, the second locking portion 30 is also a snap fit, and is formed by cutting out the support piece 19 in an inverted U-shape in the plate thickness direction, and is elastically deformable in the left-right direction Y. The second locking portion 30 includes a second elastic piece 30a (elastic piece) that is elastically deformable in the left-right direction Y, and a second holding claw 30b (holding claw) that is provided to protrude outward in the left-right direction Y from the outer surface of the second elastic piece 30a and has a tapered tip. Furthermore, since both the first locking portion 29 and the second locking portion 30 are formed by cutting out a portion of the support piece 19, the amount by which the first locking portion 29 and the second locking portion 30 protrude from the support piece 19 in the left-right direction Y can be reduced compared to when they are formed separately from the support piece 19, which can contribute to making the electronic device 1 smaller.

[0026] The circuit board 40 is, for example, a printed circuit board, and is formed in a rectangular shape having a long side in the left-right direction Y. The circuit board 40 is moved to the lower side Z2 with the surface of the lower side Z2 facing the bottom plate 11, and is accommodated in the case body 10, and is supported across a pair of support pieces 19. As shown in FIG. 6, the circuit board 40 includes a substantially rectangular plate-shaped board 41, a circuit (not shown) provided on the board 41, and a plurality of electronic components mounted on the surface (front surface) of the upper side Z1 of the board 41. In this embodiment, the plurality of electronic components are mounted on the surface of the upper side Z1 of the board 41, but this is not limited thereto, and electronic components may also be provided on the surface of the lower side Z2 of the board 41 as long as a plurality of electronic components are mounted at least on the surface of the upper side Z1 of the board 41. That is, the circuit board 40 may be a single-sided board on which electronic components are provided on one side (front surface), or a double-sided board on which electronic components are provided on both sides. In addition, circuits not shown can be provided anywhere on the substrate 41, such as the upper surface Z1 of the substrate 41, the lower surface 2 of the substrate 41, both the top and bottom surfaces of the substrate 41, the edge of the substrate 41, or inside the substrate 41.

[0027] The electronic components are composed of outer components 42 arranged along the outer edge of the board 41 (in this embodiment, the front edge and rear edge) and internal components (not shown) arranged on the inner side of the board 41 from the outer components 42. In this embodiment, a terminal block is arranged as the outer component 42, and the component of the outer component 42 arranged along the left side Y2 portion of the front edge of the board 41 is a screw terminal block 42a. Also, the component of the outer component 42 arranged next to the screw terminal block 42a on the front side X1 and along the rear edge of the board 41 is a screwless terminal block 42b. The screw terminal block 42a and the screwless terminal block 42b are parts that electrically connect the electronic device 1 to an external device.

[0028] The screw terminal block 42a and the screwless terminal block 42b are formed in a box shape, and are electrically connected to the board 41 by inserting the board connection terminals (not shown) of the screw terminal block 42a and the screwless terminal block 42b into the insertion holes 42c shown in FIG. 10 and soldering them. As shown in FIG. 6, a first groove 41a for accommodating the first rail 20 of the case body 10 is formed on the edge of the right side Y1 and the edge of the left side Y2 of the board 41. The first groove 41a is cut inward and opens outward. The first groove 41a is formed in the front side X1 portion and the rear side X2 portion of the board 41 in accordance with the position of the first rail 20. The depth of the first groove 41a is set to be approximately the same as the dimension of the lower end of the first rail 20 in the left-right direction Y. When the circuit board 40 is moved from the upper side Z1 to the lower side Z2 of the case body 10, the inner surface of the first groove 41a comes into contact with or comes close to the first rail 20, thereby being guided.

[0029] At this time, since the depth of the first groove 41a is as described above, the more the circuit board 40 is positioned on the upper side Z1, the less the first rail 20 and the inner surface of the first groove 41a come into contact with or close to each other, making it easier to move the circuit board 40. On the other hand, the more the circuit board 40 moves to the lower side Z2, the more the first rail 20 and the inner surface of the first groove 41a come into contact with or close to each other, making it harder for the circuit board 40 to be displaced relative to the case body 10, and the position of the circuit board 40 relative to the case body 10 can be determined more accurately. A second groove 41b that accommodates the second rail 31 is formed in the center of the left edge Y2 of the board 41 in the front-rear direction X.

[0030] As described above, the second rail 31 has a function of specifying the orientation of the circuit board 40 when it is accommodated in the case body 10 in one direction, and therefore the second groove 41b accommodating the second rail 31 has a function as an erroneous fitting prevention groove. The second groove 41b is cut inward and opens outward. The depth of the second groove 41b is set to be approximately the same as the dimension of the second rail 31 in the left-right direction Y. When the circuit board 40 is moved from the upper side Z1 to the lower side Z2 of the case body 10, the inner surface of the second groove 41b abuts or approaches the second rail 31, similarly to the inner surface of the first groove 41a abutting or approaching the first rail 20, thereby guiding the circuit board 40.

[0031] The circuit board 40 thus configured is formed by cutting out a plurality of pieces from one board material, a so-called "multiple-piece cutting". In this case, in this embodiment, the multiple-piece cutting is performed by two different cutting methods. Specifically, first, a cutting tool having a cutting edge on the outer periphery is rotated and penetrated into the board material positioned at a predetermined position, and a predetermined portion of the board material is cut while controlling the coordinates of the tool by a servo motor or the like, in "NC router processing". Next, a continuous or intermittent groove is formed in the portion of the board material that has not been NC router processed, and this is made into a breaking portion, and "bending breaking" is performed by bending the board 41 to break from this breaking portion. For example, as this bending breaking, in this embodiment, a V-shaped groove is continuously formed as a breaking portion, and a V-cut is performed by bending the board 41 to break from this breaking portion.

[0032] Since the NC router processing is excellent in terms of accuracy, it is possible to suppress the variation in dimensions of the circuit board 40 after cutting into multiple pieces. Specifically, in terms of cutting accuracy, if the dimensional tolerance caused by the V cut is about 1 / 10, the dimensional tolerance caused by the NC router processing is about 1 / 100. On the other hand, the V cut is excellent in work efficiency and cost because it does not require precise control of tools, etc. In this embodiment, the V cut is performed as an example of bending and breaking, but this is not limited to this. For example, a perforated break portion may be formed by intermittent grooves or slits in a portion of the board material that has not been NC router processed, and the perforated break portion may be broken by bending the board 41. In this embodiment, bending and breaking such as V cut is performed after NC router processing, but it is also possible to first cut into multiple pieces by bending and breaking such as V cut, and then perform NC router processing on required portions such as the first end face and the second end face.

[0033] In this embodiment, the front edge of the substrate 41 forms a front V-cut surface 43, and the rear edge of the substrate 41 forms a rear V-cut surface 44. At both left and right end edges of the substrate 41, a portion between the first groove 41a on the front side X1 and the first groove 41a on the rear side forms a first end surface 45 extending in the front-rear direction X, an inner surface of the first groove 41a forms a second end surface 46, and a portion of the second end surface 46 on the outer side in the front-rear direction X forms a third end surface 47 extending in the front-rear direction X. As shown in FIG. 7, the first end surface 45 faces the inner surface of the support piece 19, specifically, the inner surface of the second wall portion 28, and extends in the front-rear direction X along the inner surface. At least a part of the first end surface 45, specifically, a portion facing the first locking portion 29, forms a first cut surface 45a formed at a predetermined position by cutting along the front-rear direction X by NC router processing.

[0034] As shown in Fig. 8, at the location where the first cut surface 45a is provided, the dimension in the left-right direction Y from the first cut surface 45a on the right side Y1 to the first cut surface 45a on the left side Y2 is larger than the distance from the tip of the first holding claw 29b in the first engagement portion 29 on the right side Y1 to the tip of the first holding claw 29b on the left side Y2. As a result, as shown in Fig. 9, when the circuit board 40 is accommodated in the case body 10, the tip of the first holding claw 29b is pressed by the first cut surface 45a, and the first elastic piece 29a is elastically deformed outward in the left-right direction Y, and the first cut surface 45a is engaged with the first holding claw 29b by the restoring force and pressed inward in the left-right direction Y, thereby holding the circuit board 40 in the case body 10. At this time, the circuit board 40 is supported upward by the above-described support protrusions 13 and is pressed downward by the lower surfaces of the first holding claws 29b, and is sandwiched in the height direction Z between the protruding ends 13a of the support protrusions 13 and the lower surfaces of the first holding claws 29b. This prevents the circuit board 40 from coming loose in the height direction Z. In this way, the circuit board 40 can be easily fixed to the case body 10 without using screws, pins, or the like.

[0035] In addition, by providing the first cut surface 45a, it is possible to improve the dimensional accuracy of the portion of the circuit board 40 that extends in the front-rear direction X and is locked by the first retaining claw 29b. This makes it possible to improve the positional accuracy of the portion formed on the first retaining claw 29b with respect to the case body 10 even when variation in dimensional accuracy of the circuit board 40 is expected due to the above-mentioned multiple-piece production or the like. In addition, by improving the dimensional accuracy of the portion of the circuit board 40 that is locked by the first retaining claw 29b, the amount of elastic deformation of the first locking portion 29 is unlikely to exceed the expected amount, and the force with which the first locking portion 29 holds the circuit board 40 can be stabilized.

[0036] This is particularly noticeable when the first cut surface 45a is provided on both the left and right sides of the circuit board 40 as in this embodiment, and the dimension of the circuit board 40 in the left-right direction Y at the portion where the first cut surface 45a is formed can be made constant with high precision, and the elastic deformation amount of the first locking portion 29 can be made constant, so that the force with which the first locking portion 29 holds the circuit board 40 can be made constant. Furthermore, the first locking portion 29 is provided not on the first wall portion 27 constituting the outermost surface of the case main body 10 but on the second wall portion 28 recessed inward from the first wall portion 27, so that external parts, tools, etc. are unlikely to collide with the first locking portion 29 from the outside, and external forces are unlikely to act directly on the circuit board 40 via the first locking portion 29. Therefore, the state in which the circuit board 40 is held by the first locking portion 29 is stably maintained.

[0037] The second end face 46 is composed of a portion that is continuous with the first end face 45 and extends in the left-right direction Y perpendicular to the first end face 45, and an arc-shaped portion that connects the portion extending in the left-right direction Y. That is, the second end face 46 has a portion that extends in the left-right direction Y perpendicular to the first end face 45. The portion of the second end face 46 that extends in the left-right direction Y abuts against or is close to the side surface of the first rail 20 described above, and at least this abutting or close portion constitutes a second cut surface 46a that is cut along the left-right direction Y by NC router processing and formed at a predetermined position. Then, the second cut surface 46a abuts against or is close to the side surface of the first rail 20, thereby restricting the displacement of the circuit board 40 in the front-rear direction X.

[0038] That is, the second cut surface 46a abuts against or is close to a part of the case body 10, thereby positioning the circuit board 40 in the case body 10. The third end surface 47 is a folded fracture surface (non-cut surface) formed by the above-mentioned V-cut (folding fracture), and extends outward in the front-rear direction X continuous with the second end surface 46. As shown in Fig. 7, the third end surface 47 faces the inner surface of the support piece 19, specifically, the inner surface of the first wall portion 27, and extends in the front-rear direction X along the inner surface. That is, the third end surface 47 extends in the front-rear direction X facing the inner surface of the support piece 19 at a position different from the first end surface 45.

[0039] Here, as described above, from the viewpoint of stabilizing the force with which the first locking portion 29 holds the circuit board 40, it is preferable to form the separation distance S1 (only shown in FIG. 7) between the first cut surface 45a (first end surface 45) and the inner surface of the second wall portion 28 (support piece 19) smaller than the separation distance S2 between the third end surface 47 and the inner surface of the first wall portion 27 (support piece 19). This makes it difficult for the third end surface 47, which has greater dimensional variation than the first cut surface 45a, to come into contact with the case body 10, and allows the first locking portion 29 to reliably lock the first cut surface 45a, which has less dimensional variation. Furthermore, by setting the relationship between the clearance distance S1 and the clearance distance S2 in this manner, even if an external part, tool, etc. collides with a part other than the second wall portion 28, specifically the first wall portion 27, space is secured between the circuit board 40 and the case body 10, thereby preventing an external force applied to the case body 10 from acting directly on the circuit board 40.

[0040] The cover body 50 is a member that covers the opening of the case main body 10, and is provided so as to be detachable in the height direction Z from the case main body 10. As shown in FIG. 10, the cover body 50 has a top plate 51 that faces the surface of the upper side Z1 of the substrate 41 (circuit board 40). The top plate 51 is formed in a rectangular plate shape having long sides in the left-right direction Y. The front and rear end edges that constitute the long sides of the top plate 51 constitute the outermost edge of the cover body 50 in the front-rear direction X, and a pair of partition walls 52 (side walls) hang down from the outermost edge toward the surface (front surface) of the upper side Z1 of the substrate 41. The partition wall 52 is a wall that separates the outer component 42 from the inner component (not shown), and prevents tools for soldering the screw terminal block 42a and the screwless terminal block 42b to the substrate 41, other tools such as screws used in the outer component 42 and tools for tightening the screws, and the fingers of an operator handling the electronic device 1 (hereinafter also referred to as foreign objects) from coming into contact with the inner component.

[0041] In order to prevent foreign objects from coming into contact with the inner parts, it is possible to cover the entire periphery of the outer parts 42, such as the periphery of the screw terminal block 42a and the screwless terminal block 42b, but in this case, the shape of the cover body 50 becomes complicated and its versatility decreases, so a simple configuration in which a partition wall 52 is provided hanging down from a top plate 51 as in this embodiment is preferable. Both ends in the left-right direction Y of the inner wall surface of the partition wall 52 are capable of sliding contacting the outer surfaces (outer surfaces) in the front-rear direction X of the side walls of the first rail 20 formed on the front-rear both edges of the support piece 19 of the case body 10, whereby the cover body 50 moves in the height direction Z while being guided by the first rail 20 and is attached to the case body 10.

[0042] As shown in FIG. 11, a convex portion 53 that protrudes to the lower side Z2 is formed on the lower edge (tip edge) of the partition wall 52. In this embodiment, the convex portion 53 is formed on both left and right ends of the lower edge of the partition wall 52. The convex portion 53 is located in the height direction Z with a predetermined gap between it and the surface (front surface) of the upper side Z1 of the substrate 41. By forming the convex portion 53, when the circuit board 40 is lifted in the height direction Z (board thickness direction) due to impact, vibration, etc., the convex portion 53 is brought into contact with the surface of the upper side Z1 of the substrate 41 to suppress the lifting. In addition, by forming the convex portions 53 on both left and right ends of the lower edge of the partition wall 52, a concave portion 54 that opens to the lower side Z2 is formed between each of the convex portions 53. The upper edge 55 (edge) of the concave portion 54 is farther from the surface of the upper side Z1 of the substrate 41 in the upper side Z1 (height direction Z) than the convex portion 53. The formation of the recess 54 creates a space between the substrate 41 and the partition wall 52, making it possible to prevent interference between the partition wall 52 and electronic components. This space can be used as a mounting space for electronic components, and electronic components can be mounted on the substrate 41 even in a portion where the partition wall 52 is disposed.

[0043] On the other hand, as shown in FIG. 8, the upper edge 55 of the recess 54 is located on the lower side Z2 than the upper end 42d of the screw terminal block 42a. The upper edge 55 of the recess 54 is located on the lower side Z2 than the upper end 42e of the screwless terminal block 42b. That is, the upper edge 55 of the recess 54 is located closer to the board 41 than the upper end of the outer component 42. Therefore, the screw terminal block 42a and the screwless terminal block 42b overlap with the space generated by the recess 54 in the front-rear direction X, and the screw terminal block 42a and the screwless terminal block 42b prevent foreign matter from entering the inside of the cover body 50 through the recess 54. A second protrusion 53a protruding downward Z2 is formed at the center in the left-right direction Y of the upper edge 55 of the recess 54 (i.e., the lower edge of the partition wall 52). The second convex portion 53a is located with a predetermined gap in the height direction Z with respect to the surface of the upper side Z1 of the substrate 41, and suppresses the lifting of the circuit board 40 in the same manner as the convex portion 53. From the viewpoint of forming the recess 54 described above, the second convex portion 53a is not essential, and the second convex portion 53a can be omitted.

[0044] 2, the screw terminal block 42a or the screwless terminal block 42b (outer component 42) is attached to the front side X1 or rear side X2 of the partition wall 52 through the insertion hole 42c shown in FIG. 10, so in order to facilitate the attachment work, it is preferable to provide a predetermined gap in the front-rear direction X between the outer surface of the partition wall 52 and the back surface (the surface facing the outer surface of the partition wall 52) of the screw terminal block 42a or the screwless terminal block 42b (outer component 42). However, if the predetermined gap becomes large, the above-mentioned foreign matter may enter the gap and come into contact with the inner components in the cover body 50 through the above-mentioned recess 54.

[0045] For this reason, it is preferable that the predetermined gap is smaller than the gap between the upper edge 55 of the recess 54 and the surface of the upper side Z1 of the substrate 41. In addition, it is preferable that the predetermined gap is set to a dimension smaller than the above-mentioned foreign matter. Specifically, for example, it is preferable that the predetermined gap is set to a dimension smaller than the head of the screw used in the outer component 42 or the tip of the tool for tightening the screw. For example, in this embodiment, the predetermined gap is set to about 5 mm. That is, the partition wall 52 is provided on the inner side of the outer component 42 with a predetermined gap therebetween. In addition, by providing this predetermined gap, the gap can be used as a mounting space for the above-mentioned electronic components. This makes it possible to further increase the mounting space for the electronic components.

[0046] A slit 56 is formed on the plate surface of the partition wall 52, penetrating in the plate thickness direction and extending in the height direction Z. A plurality of slits 56 are formed side by side in the left-right direction Y. The width of the slit 56 is about 3 mm, which is smaller than the gap between the upper end edge 55 of the recess 54 and the surface of the upper side Z1 of the board 41 and a predetermined gap between the outer surface of the partition wall 52 and the back surface of the external component 42. A connector insertion hole 57 (see FIG. 2) is formed on the upper right part of the plate surface of the partition wall 52 constituting the front side X1 part of the cover body 50, penetrating in the plate thickness direction. A connector provided on a conductor of an external device (not shown) is inserted into the connector insertion hole 57, thereby connecting the external device and the electronic device 1. The connector insertion hole 57 may be omitted in drawings other than FIG. 2.

[0047] As shown in Fig. 11, a side end surface 58 is formed in the lower portion at both left and right ends of the partition wall 52, which is located inward from the outer surface of a cover side wall 59 described later and faces outward in the left-right direction Y. This side end surface 58 constitutes a restricting surface that abuts against or comes close to the inner surface of a support piece 19 of the case body 10. The side end surface 58 restricts the support piece 19 from falling inward in the left-right direction Y. In other words, the side end surface 58 abuts against or comes close to the inner surface of the support piece 19, thereby restricting the position of the support piece 19. In this way, by providing the side end surface 58 on the partition wall 52, the lower Z2 portion of the cover body 50 is accommodated inside the case body 10 between the pair of support pieces 19.

[0048] As shown in FIG. 10, a pair of cover side walls 59 hang down from both left and right end edges constituting the short side of the top plate 51 as side walls different from the partition wall 52. The cover side wall 59 is formed in a plate shape with a height dimension smaller than that of the partition wall 52, and a locking hole 60 having an edge portion that is locked by the second retaining claw 30b of the second locking portion 30 is formed through the plate surface. The distance in the left-right direction Y from the inner surface of the cover side wall 59 on the right side Y1 to the inner surface of the cover side wall 59 on the left side Y2 is larger than the dimension in the left-right direction Y from the outer surface of the upper wall portion 22 on the right side Y1 to the outer surface of the upper wall portion 22 on the left side Y2 in the case main body 10. In addition, the distance in the left-right direction Y from the inner surface of the cover side wall 59 on the right side Y1 to the inner surface of the cover side wall 59 on the left side Y2 is smaller than the distance from the tip of the second retaining claw 30b of the second locking portion 30 on the right side Y1 to the tip of the second retaining claw 30b on the left side Y2.

[0049] The dimension of the cover side wall 59 in the height direction Z is set to be larger than the distance from the end face of the upper side Z1 of the upper wall portion 22 of the case body 10 to the step portion 23 of the case body 10. The lower end edge 59a (hanging edge) of the cover side wall 59 abuts against the step portion 23 of the case body 10 when the cover body 50 is attached to the case body 10, thereby restricting the displacement of the cover body 50 to the lower side Z2. With this configuration, as shown in FIG. 10, when the cover body 50 is attached to the case body 10, the inner surface of the cover side wall 59 overlaps with the outer surface side of the upper wall portion 22, and the cover side wall 59 covers the upper part of the case body 10. At this time, the second retaining claw 30b is pressed by the inner surface of the cover side wall 59, causing the second elastic piece 30a to elastically deform inward in the left-right direction Y, and the edge of the locking hole 60 is engaged with the second retaining claw 30b due to the restoring force and pressed outward in the left-right direction Y, thereby retaining the cover body 50 to the case main body 10.

[0050] That is, the cover side wall 59 overlaps and is engaged with the outer surface side of the support piece 19 on the upper side Z1 (the opening side of the case body 10) of the first engaging portion 29. The lower end edge 59a of the cover side wall 59 abuts against the step portion 23 of the case body 10, thereby restricting displacement toward the lower side Z2. That is, the position of the cover body 50 is restricted by the hanging direction end edge of the cover side wall 59 abutting against the step portion 23. Note that, since the attachment of the cover body 50 is completed by abutting the lower end edge 59a of the cover side wall 59 against the step portion 23, there is no need to provide a member such as a stopper separately.

[0051] In this way, when the cover body 50 is attached to the case body 10, the cover side walls 59 cover the upper side Z1 portion of the case body 10 from the outside, and the cover side walls 59 regulate the outward displacement of the support pieces 19 in the left-right direction Y. With this configuration, when the cover body 50 is attached to the case body 10, the cover side walls 59 located outside the upper parts of the support pieces 19 regulate the outward displacement of the support pieces 19 in the left-right direction Y, and the side end faces 58 of the partition walls 52 located inside the lower parts of the support pieces 19 regulate the inward displacement of the support pieces 19. For this reason, the support pieces 19 are less likely to tilt with respect to the bottom plate 11.

[0052] In the electronic device 1 of the present embodiment configured as described above, the protruding direction of the first retaining claw 29b in the first locking portion 29 and the protruding direction of the second retaining claw 30b in the second locking portion 30 are opposite to each other, so that the first locking portion 29 elastically deforms outward in the left-right direction Y, and the second locking portion 30 elastically deforms inward in the left-right direction Y, in the same support piece 19. For this reason, for example, the force exerted when the first locking portion 29 is elastically deformed by the circuit board 40 is transmitted to the second locking portion 30 via the support piece 19, and the second locking portion 30 is pressed against the cover side wall 59 by the force. That is, the force exerted on the first locking portion 29 is applied to the second locking portion 30. On the other hand, the force exerted when the second locking portion 30 is elastically deformed by the cover side wall 59 is transmitted to the first locking portion 29 via the support piece 19, and the first locking portion 29 is pressed against the circuit board 40 by the force. That is, the force applied to the second locking portion 30 is applied to the first locking portion 29. In this manner, the forces applied to the first locking portion 29 and the second locking portion 30 can be added to each other, improving the holding power of the first locking portion 29 and the second locking portion 30. By having the second holding claws 30b of the second locking portion 30 protrude outward in the left-right direction Y, the shape of the upper part of the mold used to mold the first locking portion 29 can be simplified, and the molding can be facilitated.

[0053] In addition, at this time, the first elastic piece 29a pressed by the circuit board 40 may elastically deform outward in the left-right direction Y, and the support piece 19 may tend to tilt outward in the left-right direction Y. This becomes noticeable when the circuit boards 40 are manufactured in a multi-piece manner as in this embodiment, and the dimensions of the circuit boards 40 in the left-right direction Y vary to the larger side. In this case, the first locking portion 29 and the support piece 19 tend to deform more than expected, and an excessive load is applied to the base portion of the support piece 19, which has a boundary with the bottom plate 11 and is difficult to displace, and a durability problem occurs. In addition, the first locking portion 29 and the support piece 19 tend to deform more than expected, and the reaction force also increases, and the load on the circuit board 40 increases. However, as described above, the cover side wall 59 is locked to overlap the outer surface side of the support piece 19 on the upper side Z1 (the opening side of the case body 10) above the first locking portion 29, and the displacement of the tip of the support piece 19 is restricted by the cover side wall 59. Therefore, excessive load is prevented from being concentrated on the base portion of the support piece 19, and the occurrence of a load on the circuit board 40 that is greater than expected is prevented.

[0054] Meanwhile, there may be cases where the support piece 19 tends to tilt inward in the left-right direction Y in response to the second elastic piece 30a pressed by the cover side wall 59 elastically deforming inward in the left-right direction Y. In this case, as in the case where the support piece 19 tends to tilt outward in the left-right direction Y in response to the elastic deformation of the first elastic piece 29a, an excessive load is applied to the base portion of the support piece 19 and the load on the circuit board 40 increases. However, as described above, the inclination of the support piece 19 is restricted by the side end surface 58 of the partition wall 52, so that the concentration of an excessive load on the base portion of the support piece 19 and the occurrence of a load greater than expected on the circuit board 40 are suppressed.

[0055] As described above, according to the first embodiment, by providing the first cut surface 45a on at least a part of the first end surface 45 in the circuit board 40, the dimensional accuracy of the portion extending in the front-rear direction X (predetermined direction) and locked by the first holding claw 29b (holding claw) can be increased. As a result, even in a situation where the dimensional accuracy of the circuit board 40 is expected to vary due to the above-mentioned multiple-piece taking, the positional accuracy of the portion locked by the first holding claw 29b with respect to the case body 10 can be increased. Therefore, the circuit board 40 can be accurately accommodated in the case body 10, and the circuit board 40 can be stably locked. In addition, by increasing the dimensional accuracy of the portion of the circuit board 40 locked by the first holding claw 29b, the first elastic piece 29a (elastic piece) is prevented from being deformed more than expected. Therefore, the generation of a restoring force more than expected in the first elastic piece 29a is also prevented, and the application of an unexpected load to the circuit board 40 is prevented. Therefore, it is possible to provide an electronic device 1 in which the circuit board 40 (board) can be accurately accommodated in the case body 10 (case) and the load acting on the circuit board 40 is reduced.

[0056] Furthermore, according to this embodiment, the position of the circuit board 40 in the left-right direction Y (orthogonal direction) is determined by the first holding claws 29b and the first cut surface 45a, and the position of the circuit board 40 in the front-rear direction X (predetermined direction) is determined by the second cut surface 46a and the side wall of the first rail 20 (a part of the case body 10). That is, the circuit board 40 is positioned relative to the case body 10 from at least two directions. This improves the positional accuracy of the circuit board 40 relative to the case body 10, and the state in which the circuit board 40 is housed in the case body 10 can be stably maintained.

[0057] Furthermore, according to this embodiment, the position of the circuit board 40 in the front-rear direction X relative to the case body 10 can be determined by abutting or bringing the side surface of the first rail 20 (rib) and the second cut surface 46a into close proximity, so that the side surface of the first rail 20 and the second cut surface 46a can be brought into sliding contact with each other, thereby allowing the first rail 20 to be used as a guide when attaching the circuit board 40 to the case body 10. Therefore, the circuit board 40 can be accommodated in the case body 10 even more accurately.

[0058] Further, according to this embodiment, the separation distance S1 (distance) between the first cut surface 45a (first end surface 45) having the first cut surface 45a and the inner surface of the support piece 19 is set to be smaller than the separation distance S2 (distance) between the third end surface 47, which is a non-cut surface, and the inner surface of the support piece 19. This makes it difficult for the third end surface 47 to come into contact with the support piece 19, and the first cut surface 45a can be reliably locked by the first holding claw 29b (holding claw). For this reason, even if the third end surface 47 is formed by bending and breaking, causing variations in the dimensions of the circuit board 40, or the third end surface 47 is formed with protrusions such as burrs or recesses, causing variations in the dimensions of the circuit board 40, the circuit board 40 can be accurately accommodated in the case body 10 without being affected, and the load acting on the circuit board 40 can be reduced.

[0059] According to the present embodiment, the partition wall 52 that hangs down from the top plate 51 toward the surface (front surface) of the upper side Z1 of the board 41 can separate the outer component 42 and the inner component in the electronic components of the circuit board 40 in the inner and outer directions. Therefore, for example, it is possible to prevent foreign objects such as tools and the fingers of an operator who handles electronic devices from contacting the inner components without covering most of the periphery of the screw terminal block 42a and the screwless terminal block 42b (outer component 42) as the outer component 42. In addition, since a predetermined gap is provided between the outer surface of the partition wall 52 and the back surface of the outer component 42, this gap can be used as a mounting space for electronic components, and the mounting space can be secured in a large amount. In addition, the cover body 50 can be configured without depending on the outer shapes of the outer component 42 and the inner component with a simple structure of the top plate 51 and the partition wall 52 that hangs down from the top plate 51, so that the cover body 50 is highly versatile and can have a wide variety of screw terminal blocks 42a and screwless terminal blocks 42b to be mounted. Therefore, it is possible to provide an electronic device 1 equipped with a versatile cover body 50 (cover) that prevents foreign matter from coming into contact with the internal electronic components with a simple configuration.

[0060] According to this embodiment, for example, when the circuit board 40 is lifted in the height direction Z (board thickness direction) due to impact, vibration, or the like, the protrusion 53 of the partition wall 52 is brought into contact with the surface (front surface) of the upper side Z1 of the board 41, thereby suppressing the lifting. According to this configuration, a predetermined gap is generated in the height direction Z between the upper end edge 55 (edge) of the recess 54 of the partition wall 52 and the surface of the upper side Z1 of the board 41, and this gap can be used as a mounting space for the above-mentioned electronic components. Since the upper end edge 55 of the recess 54 is located closer to the board 41 than the upper end 42d of the outer component 42, the partition wall 52 and the outer component 42 overlap in the front-rear direction X (inner-outer direction), and it is possible to suppress the intrusion of foreign matter into the inside of the electronic device 1 through between the partition wall 52 and the outer component 42.

[0061] Furthermore, according to this embodiment, the inner surface of the partition wall 52 is able to slide against the outer surface of the first rail 20 (rib), so that the cover body 50 can be moved in the height direction Z (plate thickness direction) while the partition wall 52 of the cover body 50 is guided by the outer surface of the first rail 20, and the cover body 50 can be attached to the case body 10. Therefore, the cover body 50 can be easily and accurately attached to the case body 10.

[0062] In addition, according to this embodiment, the gap in a specified direction between the outer surface of the partition wall 52 and the back surface of the external component 42 is set to a dimension smaller than the size of the screws used in the external component 42 or the tip of the tool for tightening the screws (foreign objects), thereby preventing these foreign objects from entering the interior of the electronic device 1 through the gap between the partition wall 52 and the external component 42.

[0063] Furthermore, according to this embodiment, even if the dimensions of the circuit board 40 accommodated in the case body 10 vary to a larger extent and the first locking portion 29 and the support piece 19 are about to deform more than expected, the cover side wall 59 overlaps and locks with the outer surface side of the support piece 19 on the opening side of the case body 10 relative to the first locking portion 29. Therefore, the displacement of the tip of the support piece 19 is restricted by the cover side wall 59, and the support piece 19 is less likely to tilt outward from the base portion of the support piece 19 on the bottom plate 11 side as a starting point. This makes it possible to prevent excessive load from concentrating on the base portion of the support piece 19. Therefore, it is possible to provide an electronic device 1 that prevents excessive load from being applied to the structure for fixing the circuit board 40 (substrate).

[0064] Furthermore, according to this embodiment, the support piece 19 of the case body 10 is cut out to provide the first elastic piece 29a (elastic piece). Therefore, compared to the case in which the first elastic piece 29a is configured as a separate piece from the support piece 19, the amount by which the first engaging portion 29 protrudes from the case body 10 can be reduced, and the case body 10 can be made smaller accordingly.

[0065] Furthermore, according to this embodiment, when the first locking portion 29 is pressed from the inside to the outside by the inner circuit board 40 and elastically deforms, the force is transmitted to the second locking portion 30 via the support piece 19, and the second locking portion 30 is pressed against the cover side wall 59 by this force. That is, the force applied to the first locking portion 29 is applied to the second locking portion 30. On the other hand, when the second locking portion 30 is pressed from the outside to the inside by the outer cover side wall 59 and elastically deforms, the force is transmitted to the first locking portion 29 via the support piece 19, and the first locking portion 29 is pressed against the circuit board 40 by this force. That is, the force applied to the second locking portion 30 is applied to the first locking portion 29. In this way, by making the protruding directions of the first locking portion 29 and the second locking portion 30 different on the inside and outside of the support piece 19, the forces applied to the first locking portion 29 and the second locking portion 30 can be added to each other, thereby improving the holding force of the first locking portion 29 and the second locking portion 30.

[0066] Furthermore, according to this embodiment, the step 23 constituting the boundary between the lower wall 21 and the upper wall 22 in the support piece 19 can be used as a structure for restricting the position of the cover body 50 when the lower edge 59a (hanging edge) of the cover side wall 59 abuts against it. Therefore, it is possible to position the cover body 50 relative to the case body 10 with a simple structure without attaching a special structure such as a stopper to the case body 10.

[0067] Furthermore, according to this embodiment, the side end surface 58 of the cover body 50 overlaps with the inner surface of the support piece 19 as a regulating surface, so that the cover side wall 59 overlaps with the outer surface of the support piece 19, thereby preventing the support piece 19 from collapsing inward due to being pressed by the cover side wall 59 when the case main body 10 and the cover body 50 are combined.

[0068] In addition, according to this embodiment, the first elastic piece 29a (elastic piece) of the first locking portion 29 is provided by cutting out the second wall portion 28 of the support piece 19, so that the amount of protrusion of the first locking portion 29 from the case body 10 can be reduced compared to the case where the first elastic piece 29a is configured separately from the support piece 19, and the case body 10 can be made smaller accordingly. The second wall portion 28 having the first locking portion 29 is recessed inward from the first wall portion 27 constituting the outermost surface of the support piece 19, so that the second wall portion 28 is less likely to be hit by external parts, tools, etc., and is less likely to receive external forces. Therefore, it is possible to suppress the external force from directly becoming a load on the circuit board 40. Therefore, it is possible to provide an electronic device 1 in which external forces are less likely to be applied to the circuit board 40 (board) while achieving miniaturization.

[0069] According to this embodiment, in the relationship between the circuit board 40 and the support piece 19 of the case body 10, the separation distance S2 (distance) between the first wall portion 27, to which an external force is easily applied, and the third end face 47 (an end face extending in the left-right direction Y (predetermined direction) facing the inner face of the first wall portion 27) is larger than the separation distance S1 (distance) between the second wall portion 28, to which an external force is less likely to be applied, and the first end face 45 (an end face extending in the left-right direction Y (predetermined direction) along the inner face of the second wall portion 28) as described above. Therefore, even if an external force is applied to the case body 10 by a part other than the second wall portion 28, specifically the first wall portion 27 colliding with an external part, tool, or the like, the external force can be prevented from directly acting as a load on the circuit board 40.

[0070] According to the present embodiment, in the electronic device 1 described above, the first locking portion 29 that locks and holds the circuit board 40 may be pushed by the circuit board 40 and elastically deform outward from the case body 10, and the second wall portion 28 having the first locking portion 29 may try to deform outward from the case body 10 accordingly. In this case, a load may be applied to the circuit board 40 due to the reaction force of the elastically deformed first locking portion 29. However, according to this configuration, the cover side wall 59 is provided so as to overlap the outer surface side of the support piece 19 having the first locking portion 29 on the opening side of the case body 10 closer to the opening side of the case body 10 than the first locking portion 29, so that the displacement of the support piece 19 is restricted by the cover side wall 59, and the elastic deformation outward from the case body 10 is alleviated. In addition, this also alleviates the elastic deformation of the first locking portion 29 outward from the case body 10, and therefore the reaction force of the first locking portion 29 described above is also alleviated, and the load on the circuit board 40 can be reduced.

[0071] Although the embodiment and the modified examples of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention includes design changes within the scope of the present invention. FIG. 12 is a perspective view of an electronic device 1' according to a second embodiment. The second embodiment is different from the first embodiment in that the protective cover 70 described above is not omitted. The protective cover 70 is a protective member that covers the upper part of the outer component 42, and is supported in the left-right direction Y across the extension portion 24 on the right side Y1 and the extension portion 24 on the left side Y2 as shown in FIG. 13. In this state, the gap in a predetermined direction between the outer surface of the partition wall 52 and the back surface of the outer component 42 described above is hidden when viewed from the upper side Z1, making it more difficult for the above-mentioned foreign matter to enter the gap from the upper side Z1.

[0072] As shown in FIG. 14, the protective cover 70 is formed in a substantially rectangular plate shape. On both the left and right ends of the protective cover 70, protrusions 71 protruding outward are formed, respectively. As shown in FIG. 15, the protective cover 70 is fixed to the case body 10 by inserting each of the protrusions 71 into the fixing holes 25 formed in the extension portion 24. According to this configuration, the protective cover 70 can prevent, for example, a foreign object that has fallen from above the cover body 50 from contacting the outer component 42, or the foreign object from moving toward the gap in a predetermined direction between the outer surface of the partition wall 52 and the back surface of the outer component 42. This can further prevent the contact of the foreign object with the inner component. [Explanation of symbols]

[0073] X Front-rear direction (predetermined direction) Y Left / Right direction (orthogonal direction) Z Height direction (plate thickness direction) 1 Electronic equipment 10 Case body 11 Bottom plate 19 Support piece 27 1st wall 28 Second wall section 29 First locking part 29a First elastic piece (elastic piece) 29b 1st holding claw (holding claw) 40 Circuit Board 41 Substrate 42 External parts 45 First end surface 45a 1st cutting surface 50 Cover body 51 Tabletop 52 Partition wall (side wall) 59 Cover side wall

Claims

1. An electronic device comprising: a case body having a bottom plate and an opening facing the bottom plate; a circuit board accommodated in the case body; and a cover body covering the opening of the case body, The case body has a pair of support pieces that rise from the bottom plate and face each other, The circuit board is supported across the pair of support pieces, The pair of support pieces are provided with first locking portions that protrude inward and are elastically deformable in a plate thickness direction of the support pieces to lock and hold the circuit board, the cover body has a top plate facing the circuit board and a pair of cover side walls hanging down from side edges of the top plate, The electronic device according to claim 1, wherein the cover side wall overlaps and is engaged with an outer surface of the support piece on the opening side of the case body relative to the first engaging portion.

2. The electronic device according to claim 1, characterized in that the first engagement portion has an elastic piece formed by cutting the support piece in the thickness direction thereof and capable of elastically deforming in the thickness direction of the support piece, and a retaining claw formed to protrude inward from the elastic piece.

3. 2. The electronic device according to claim 1, wherein the pair of support pieces are provided with second locking portions that protrude outward, are elastically deformable in a thickness direction of the support pieces, and lock and hold the cover side walls.

4. the pair of support pieces each have a tip portion on the case body opening side, a base portion on the case body bottom plate side, and a step portion provided at a boundary between the tip portion and the base portion, the cover body is detachably provided to the case body in a thickness direction of the circuit board, 4. The electronic device according to claim 3, wherein the second engaging portion is provided at the tip portion, and the position of the cover body is restricted by the downward end edge of the cover side wall abutting against the step portion.

5. The electronic device according to claim 1, characterized in that the cover body has a regulating surface provided inward from the pair of cover side walls, and the position of the regulating surface is regulated by abutting or approaching an inner surface of the support piece.

Images