Electronic devices

Abstract

To provide an electronic device that suppresses the occurrence of unintended gaps. [Solution] An electronic device comprising a circuit board and a case housing the circuit board, wherein the case comprises a cover member and a housing member having a different rigidity from the cover member and forming at least a part of the housing space housing the circuit board. The case includes a fixing member 60 that is inserted through a cover through hole 43 provided in the cover member and a housing member hole 23 provided in the housing member, fixing the cover member and the housing member in contact with each other. The case is formed on the member with higher rigidity between the cover member and the housing member, and includes a deformation suppression portion 25 that bites into each other when the cover member and the housing member are fixed together by the fixing member.

Description

Technical Field

[0001] The disclosure in this specification relates to an electronic device.

Background Art

[0002] Patent Document 1 discloses a wiring pipe box including a box body and a box cover attached to the box body. The description of the prior art document is incorporated herein by reference as an explanation of the technical elements in this specification.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the configuration of the prior art document, the box cover is fixed to the box body with screws. Screwed members such as screws may loosen due to various factors such as vibration and temperature changes over time, and the axial force may decrease. In the state where the screws are loose, an appropriate axial force cannot be applied to the box cover. Therefore, deformation or displacement of the box cover cannot be restricted, and an unintended gap may occur between the box body and the box cover. From the above viewpoints or other viewpoints not mentioned, further improvements are required for the electronic device.

[0005] One object of the disclosure is to provide an electronic device that suppresses the occurrence of an unintended gap.

Means for Solving the Problems

[0006] The above objectives are achieved by the combination of features described in the independent claims. Subordinate claims further specify advantageous examples. The reference numerals in parentheses in the claims indicate correspondences with specific embodiments described later in the embodiments, and do not limit the disclosed technical scope. The objectives, features, and effects disclosed in this specification will become clearer with reference to the subsequent detailed description and the accompanying drawings.

[0007] One disclosure for achieving the above objective is an electronic device comprising a circuit board (50) and a case (10) housing the circuit board, The case is, Cover member (40) and A housing member (20) having a different rigidity from the cover member and forming at least a part of the housing space that houses the circuit board, A fixing member (60) is inserted through a cover through-hole (43) provided in the cover member and a housing member hole (23) provided in the housing member, fixing the cover member and the housing member in contact with each other. This electronic device is provided with deformation suppression parts (25, 225, 325, 425, 525, 625, 725) formed on the member with higher rigidity among the cover member and the housing member, and which bite into each other when the cover member and the housing member are fixed together by a fixing member.

[0008] According to the disclosed electronic device, a deformation suppression portion is formed on the member with higher rigidity between the cover member and the housing member, and in a fixed state where the cover member and the housing member are fixed to each other by a fixing member, the cover member and the housing member are provided with a deformation suppression portion that bites into each other. Therefore, relative movement between members with different rigidities is suppressed not only by the fixing member but also by the deformation suppression portion. Thus, even if the axial force of the fixing member decreases, it is possible to provide an electronic device that suppresses the occurrence of unintended gaps. [Brief explanation of the drawing]

[0009] [Figure 1]This is a perspective view showing an electronic device. [Figure 2] This is a perspective view showing the base component. [Figure 3] This is a magnified view showing a linear projection. [Figure 4] This is a cross-sectional view taken along line IV-IV in Figure 1. [Figure 5] This is a perspective view showing the base member in the second embodiment. [Figure 6] This is a partially enlarged view showing the linear projection in the second embodiment. [Figure 7] This is a partially enlarged view showing the linear projection in the third embodiment. [Figure 8] This is a partially enlarged view showing the annular projection in the fourth embodiment. [Figure 9] This is a partially enlarged view showing the U-shaped projection in the fifth embodiment. [Figure 10] This is a partially enlarged view showing the linear groove portion in the sixth embodiment. [Figure 11] This is a cross-sectional view showing the area around the linear groove in the sixth embodiment. [Figure 12] This is a partially enlarged view showing the annular groove portion in the seventh embodiment. [Figure 13] This is a cross-sectional view showing the area around the annular groove in the seventh embodiment. [Modes for carrying out the invention]

[0010] Multiple embodiments will be described with reference to the drawings. In multiple embodiments, functionally and / or structurally corresponding and / or related parts may be given the same reference numeral, or reference numerals that differ by hundreds or more digits. For corresponding and / or related parts, refer to the description of other embodiments.

[0011] (First Embodiment) In FIG. 1, the electronic device 100 is configured to be mounted on a moving body, for example. Examples of the moving body include vehicles such as electric vehicles, hybrid vehicles, and fuel cell vehicles, flying bodies such as electric vertical take-off and landing aircraft and drones, ships, construction machinery, and agricultural machinery.

[0012] In this embodiment, as an example, the electronic device 100 is applied to a vehicle anti-theft device. The anti-theft device includes an immobilizer device, a locking device, etc. Therefore, the electronic device 100 needs to comply with, for example, the agreement rules (UN R116) related to the anti-theft device. Also, in order to comply with the rules, it is necessary to satisfy the IP40 requirement. The IP40 requirement is a requirement to protect so that solids with a diameter of 1.0 mm (φ1) or more do not enter the case. In the IP40 requirement, a structure is required such that a test rod (φ1 + 0.05 / 0) cannot enter the case even when inserted with a load of 1 ± 0.1 N.

[0013] The electronic device 100 includes a circuit board 50 and a case 10 that houses the circuit board 50. A plurality of circuit components and a connector 53 are mounted on the circuit board 50. The wiring board is a board in which conductive wiring is formed on an electrically insulating board. When the circuit board 50 is housed in the case 10, only the connector 53 protrudes outside the case 10.

[0014] The circuit components and the connector 53 are electrically connected to the wiring in the state of being mounted on the wiring board. The connector 53 is for electrically connecting the electronic device 100 and an in-vehicle device provided outside the electronic device 100. The connector 53 includes a terminal electrically connected to the wiring of the wiring board and a connector case surrounding the terminal.

[0015] The case 10 includes a housing member 20, a cover member 40, and a bolt 60. The case 10 has a substantially rectangular parallelepiped box shape when the housing member 20 and the cover member 40 are assembled. The case 10 forms a housing space for housing components to be housed such as a circuit board 50 inside. The housing member 20 may be formed into a bag shape capable of housing the circuit board 50, and a configuration may be adopted in which the housing space is formed only by the housing member 20 without depending on the assembly with the cover member 40. It can be said that the housing member 20 forms at least a part of the housing space.

[0016] The housing member 20 has a base member 21 and a lid member 29. The base member 21 forms the bottom surface and the side surfaces of the housing member 20. The lid member 29 forms the top surface of the housing member 20 when attached to the base member 21. On the side surface of the base member 21, the surface on the side to which the cover member 40 is attached is the front surface.

[0017] The housing member 20 is not limited to the example constituted by two members, the base member 21 and the lid member 29. For example, in the base member 21, the housing member 20 may be constituted by one continuous member by providing in advance a top surface corresponding to the lid member 29. Alternatively, the housing member 20 may be constituted by combining three or more members.

[0018] <{ Both the base member 21 and the lid member 29 are mainly composed of metal. In other words, the housing member 20 is made of metal. As the metal constituting the housing member 20, aluminum, iron, copper, etc. can be adopted. By making the housing member 20 made of metal, high shielding performance against noise can be ensured.

[0019] The cover member 40 is a rectangular member. Hereinafter, the longitudinal direction of the cover member 40 may be referred to as the left - right direction, and the short - hand direction of the cover member 40 may be referred to as the up - down direction. The longitudinal direction and the short - hand direction of the cover member 40 are directions orthogonal to each other on the plane of the cover member 40.

[0020] The cover member 40 comprises a plate-shaped member 41 and a packing member 42. The plate-shaped member 41 has two openings formed along its left-right direction. Connectors 53 protrude from each of the two openings of the plate-shaped member 41. Between the openings of the plate-shaped member 41 and the connectors 53, a packing member 42 is provided in an annular shape around the connectors 53 to prevent foreign matter from entering the inside of the case 10. A packing member 42 is also provided between the plate-shaped member 41 and the lid member 29. This prevents foreign matter from entering the inside of the case 10 from between the lid member 29 and the plate-shaped member 41.

[0021] The plate-shaped member 41 is mainly composed of a rigid resin. Polypropylene can be used as the rigid resin. Polypropylene is a rigid resin made of propylene polymer. In other words, the plate-shaped member 41 is made of a general-purpose plastic.

[0022] The packing member 42 is mainly composed of a soft resin. Elastomers can be used as the soft resin. Elastomers are soft resins with rubber elasticity. Therefore, the packing member 42 can elastically return to its original shape after tensile or compressive deformation.

[0023] The resin cover member 40 has lower rigidity than the metal housing member 20. Therefore, the cover member 40 is softer than the housing member 20. Furthermore, the resin cover member 40 has a higher coefficient of thermal expansion than the metal housing member 20. Therefore, the cover member 40 is more susceptible to significant changes in shape due to temperature changes than the housing member 20.

[0024] The bolts 60 secure the housing member 20 and the cover member 40 in contact with each other. In other words, the bolts 60 are components that fix the housing member 20 and the cover member 40 together. The bolts 60 are provided in two locations, spaced apart from each other and aligned in the left-right direction. The bolts 60 have screw threads and function as male screws. The bolts 60 provide an example of a fixing component.

[0025] In Figure 2, the base member 21 is provided with a housing member hole 23. The housing member hole 23 is provided in two locations on the front surface of the base member 21, spaced apart from each other, near the right end and near the left end. The housing member hole 23 is a screw hole into which a bolt 60 is inserted. The housing member hole 23 functions as a female screw for the male screw of the bolt 60. The housing member hole 23 may be a through hole that completely penetrates from the front surface to the back surface of the base member 21, or it may be a stop hole that does not completely penetrate.

[0026] The base member 21 is provided with linear projections 25 around the housing member holes 23. Since there are two housing member holes 23, there are two linear projections 25 corresponding to each housing member hole 23. The two linear projections 25 are located outside the housing member holes 23. In other words, the two housing member holes 23 are located between the two linear projections 25.

[0027] The linear projection 25 has a triangular cross-sectional shape perpendicular to the surface of the base member 21. The linear projection 25 has a pointed shape in which the cross-sectional area of ​​the surface parallel to the surface of the base member 21 decreases as it moves away from the surface of the base member 21. The linear projection 25 has a triangular prism shape with the vertical direction as its longitudinal direction. The linear projection 25 provides an example of a deformation suppression part. The linear projection 25 provides an example of a linear part. The linear projection 25 provides an example of a projection.

[0028] The shape of the linear projection 25 is not limited to a triangular prism. For example, the linear projection 25 may have a trapezoidal cross-sectional shape perpendicular to the surface of the base member 21. For example, the linear projection 25 may have a square cross-sectional shape perpendicular to the surface of the base member 21. For example, the linear projection 25 may have a semicircular cross-sectional shape perpendicular to the surface of the base member 21.

[0029] The linear projection 25 can be formed by machining the front surface of the base member 21. By forming the linear projection 25 by machining, the linear projection 25 can be provided integrally with the base member 21. When forming the linear projection 25 by machining, it is preferable that the cross-sectional shape of the linear projection 25 perpendicular to the surface of the base member 21 be a trapezoidal shape close to a triangle. This is because it is easier to machine even if the machining accuracy is somewhat low, and it is easier to improve manufacturing efficiency. The method of forming the linear projection 25 on the base member 21 is not limited to the method described above. For example, the linear projection 25 may be formed as a separate part from the base member 21 and attached to the base member 21.

[0030] In Figure 3, the linear projection 25 has the same shape from one end to the other in the vertical direction. The length of the linear projection 25 in the vertical direction is greater than the diameter of the housing member hole 23. The width of the linear projection 25 in the horizontal direction is smaller than the diameter of the housing member hole 23. The width of the linear projection 25 can be set within the range of 0.1 mm to 2 mm. For example, the width of the linear projection 25 is 1 mm.

[0031] In Figure 4, the base member 21 and the plate-shaped member 41 are fastened and fixed together by bolts 60 while in contact with each other. Therefore, the linear projection 25 can be said to be provided on the contact surface between the base member 21 and the plate-shaped member 41. Here, the packing member 42 is provided in a position that avoids the area around the bolts 60. Therefore, around the bolts 60, there are no other members interposed between the base member 21 and the plate-shaped member 41, and the base member 21 and the plate-shaped member 41 are in direct contact.

[0032] The bolt 60 comprises a shaft portion 61 and a head portion 62. The shaft portion 61 is threaded. The shaft portion 61 is inserted through two holes: a housing member hole 23 provided in the base member 21 and a cover through hole 43 provided in the plate-shaped member 41. If the housing member hole 23 is a stop hole that does not completely penetrate, the shaft portion 61 will penetrate the cover through hole 43 and then be inserted through the housing member hole 23. A washer may be provided between the head portion 62 and the plate-shaped member 41. In the figure, the central axis C1 of the bolt 60 is shown by a dashed line.

[0033] The linear projection 25 is located around the bolt 60. More specifically, the installation distance L1, which is the shortest distance from the central axis C1 to the tip of the linear projection 25, is less than three times the radius of the head 62.

[0034] The amount of the linear projection 25 protruding from the surface of the base member 21 is less than or equal to half the thickness of the plate-shaped member 41. The upper limit of the protrusion of the linear projection 25 should be such that the plate-shaped member 41 is not damaged when fastened and fixed with the bolt 60. The lower limit of the protrusion of the linear projection 25 should be such that the linear projection 25 bites into the plate-shaped member 41, causing deformation. The protrusion of the linear projection 25 can be set in a range of, for example, 0.1 mm to 2 mm, and is preferably about 1 mm. The direction of protrusion of the linear projection 25 coincides with the axial direction of the bolt 60.

[0035] The linear projection 25 bites into the portion of the plate-shaped member 41 that is facing the linear projection 25. In other words, due to the axial force applied by the bolt 60, a portion of the plate-shaped member 41 is deformed while the base member 21 and the plate-shaped member 41 are in contact. This is because the rigidity of the base member 21 is higher than that of the plate-shaped member 41. In other words, the base member 21 is a harder material than the plate-shaped member 41. The deformation in which the linear projection 25 bites into the plate-shaped member 41 occurs when the cover member 40 is assembled to the housing member 20 and fastened and fixed with the bolt 60. Even if the axial force of the bolt 60 decreases after fastening and fixing with the bolt 60, the state in which the linear projection 25 bites into the plate-shaped member 41 is maintained. The portion of the plate-shaped member 41 that is facing the linear projection 25 can be said to be a low-rigidity portion, which is relatively less rigid than the linear projection 25. Furthermore, the linear projection 25 can be said to be a high-rigidity portion, having relatively higher rigidity compared to the portion of the plate-shaped member 41 facing the linear projection 25. Therefore, it can be said that the high-rigidity linear projection 25 is embedded in the portion of the plate-shaped member 41 facing the linear projection 25, which is a low-rigidity portion. Alternatively, it can be said that the high-rigidity linear projection 25 and the portion of the plate-shaped member 41 facing the linear projection 25 are engaged with each other.

[0036] The linear projection 25 bites into the plate-shaped member 41, which suppresses the movement of the plate-shaped member 41 in the direction of sliding against the surface of the base member 21. This is because a force is generated at the linear projection 25 that repels the component of the external force applied to the plate-shaped member 41 that causes movement in the direction of sliding against the surface of the base member 21. Therefore, it can be said that the movement of the plate-shaped member 41 relative to the base member 21 is suppressed by the bolt 60 and the biting of the linear projection 25 into the plate-shaped member 41. Furthermore, by suppressing the sliding of the plate-shaped member 41, the warping of the plate-shaped member 41 can be suppressed. This makes it easier to suppress deformation that would cause the plate-shaped member 41 to warp away from the surface of the base member 21.

[0037] The effects of the above-described embodiment will now be explained. According to the above-described embodiment, the electronic device 100 is provided with linear projections 25 on the housing member 20 that interlock with the cover member 40. In other words, the electronic device 100 is provided with deformation suppression parts on the member with higher rigidity between the cover member 40 and the housing member 20, where the cover member 40 and the housing member 20 interlock with each other. Therefore, in addition to the bolts 60, the linear projections 25 also suppress relative movement between the housing member 20 and the cover member 40. Thus, even if the axial force of the bolts 60 decreases, it is possible to provide an electronic device 100 that suppresses the occurrence of unintended gaps. When bolts 60 fix the housing member 20 and the cover member 40, which are members with different coefficients of thermal expansion, the bolts 60 tend to loosen due to temperature changes, and the axial force tends to decrease. Therefore, the configuration in which the linear projections 25 interlock with each other to suppress deformation is particularly useful when the thermal expansion coefficients of the members are different.

[0038] The linear projection 25 extends along the vertical direction, which is the shorter direction of the cover member 40. Therefore, it is easy to stably generate a repulsive force against the force that would cause the cover member 40 to slide in the horizontal direction, which is the longer direction. Consequently, deformation of the cover member 40 can be effectively suppressed.

[0039] The linear projection 25 protrudes beyond the front surface of the housing member 20. As a result, the linear projection 25 bites into the cover member 40. Therefore, the degree of biting can be easily adjusted by adjusting the amount of protrusion and cross-sectional shape of the linear projection 25. More specifically, the degree of biting can be increased by increasing the amount of protrusion of the linear projection 25. In addition, the sharper the tip of the linear projection 25, the easier it is to maintain a state of being deeply bitten into the cover member 40 even if the axial force of the bolt 60 decreases.

[0040] The amount of protrusion of the linear projection 25 is less than half the thickness of the cover member 40. Therefore, the amount of indentation of the linear projection 25 does not exceed half the thickness of the cover member 40. Consequently, it is easier to prevent the cover member 40 from cracking due to excessive indentation of the linear projection 25.

[0041] The explanation described an example where the housing member 20 is made of metal and the cover member 40 is made of resin, with the housing member 20 having higher rigidity than the cover member 40. However, the relationship of rigidity is not limited to the example described above. For example, the housing member 20 may be made of resin and the cover member 40 may be made of metal, so that the cover member 40 has higher rigidity than the housing member 20. In this case, the linear projection 25 would be provided on the cover member 40, which is the member with relatively higher rigidity.

[0042] (Second Embodiment) This embodiment is a modification based on the preceding embodiment. In this embodiment, linear projections 225 are provided on both sides of the housing member hole 23.

[0043] In Figure 5, the base member 21 is provided with a linear projection 225. The linear projection 225 is provided around one of the two housing member holes 23 provided on the front surface of the base member 21, but not around the other housing member hole 23. In other words, the linear projection 225 is provided on the front surface of the base member 21, biased to one side in the left-right direction.

[0044] It is preferable to provide the linear projection 225 around the housing member hole 23 that is loosely positioned in the temporarily fixed state before the housing member 20 and the cover member 40 are fastened and fixed by bolts 60. In other words, it is preferable to provide it around the housing member hole 23 that is more prone to changes in position of the cover through hole 43 corresponding to the housing member hole 23 in the temporarily fixed state.

[0045] The linear projections 225 are provided on both sides of the housing member hole 23. In other words, the housing member hole 23 is positioned between two linear projections 225 that are arranged side by side in the left-right direction. Both linear projections 225 are triangular prisms and have the same shape as each other. However, the two linear projections 225 may have different shapes. The linear projections 225 provide an example of a deformation suppression part. The linear projections 225 provide an example of a linear part. The linear projections 225 provide an example of a projection.

[0046] In Figure 6, the two linear projections 225 are arranged parallel to each other and extend along the vertical direction. The distance from the housing member hole 23 located between the two linear projections 225 to the two linear projections 225 is equal in size.

[0047] The effects of the above-described embodiment will now be explained. According to the above-described embodiment, multiple linear projections 225 are provided on both sides of the bolt 60. Therefore, compared to the case where linear projections 225 are provided on only one side of the bolt 60, a larger area can be secured for the projections to bite into the cover member 40. Consequently, it is easier to suppress the movement of the cover member 40 relative to the housing member 20.

[0048] The linear projection 225 is provided around one of the two housing member holes 23, but not around the other. Therefore, compared to the case where linear projections 225 are formed on both sides of each of the two housing member holes 23, manufacturability is easier to improve.

[0049] (Third embodiment) This embodiment is a modification based on the preceding embodiment. In this embodiment, the linear projection 325 is composed of projection pieces 325P arranged in the vertical direction.

[0050] In Figure 7, the base member 21 is provided with a linear projection 325. The linear projection 325 is composed of five projection pieces 325P that are spaced apart vertically and arranged at equal intervals. In other words, gaps are formed between the projection pieces 325P that are arranged vertically relative to each other.

[0051] The projection 325P is a triangular prism shape in which the vertical length and the horizontal length are equal to each other. The vertical length and horizontal length of the projection 325P are smaller than the diameter of the housing member hole 23. However, the vertical length and horizontal length of the projection 325P may be different from each other.

[0052] The shape of the projection piece 325P is not limited to a triangular prism shape, as long as the cross-sectional area of ​​the surface parallel to the surface of the base member 21 decreases as it moves away from the surface of the base member 21. The projection piece 325P may be, for example, a square pyramidal shape or a conical shape with the surface of the base member 21 as its base. Alternatively, the linear projection 325 may be constructed by combining projection pieces 325P of different shapes. For example, the linear projection 325 may be constructed by mixing square pyramidal projection pieces 325P and conical projection pieces 325P. The linear projection 325 provides an example of a deformation suppression part. The linear projection 325 provides an example of a linear part. The linear projection 325 provides an example of a projection.

[0053] The effects of the above-described embodiment will now be explained. According to the above-described embodiment, the linear projection 325 is provided with a plurality of projection pieces 325P arranged linearly along the vertical direction, which is the shorter direction of the cover member 40. Therefore, the area that bites into the cover member 40 can be reduced compared to when there is no gap between the vertically arranged projection pieces 325P. Consequently, the linear projection 325 can easily bite into a deeper position. Thus, it is easier to stably and significantly ensure the amount of biting between the housing member 20 and the cover member 40.

[0054] (Fourth Embodiment) This embodiment is a modification based on the preceding embodiment. In this embodiment, an annular projection 425 is formed around the housing member hole 23.

[0055] In Figure 8, the base member 21 is provided with an annular projection 425. The annular projection 425 is provided around the housing member hole 23. The central axis of the annular projection 425 coincides with the central axis of the housing member hole 23. The annular projection 425 has a shape in which the cross-sectional area of ​​the surface parallel to the surface of the base member 21 decreases as it moves away from the surface of the base member 21. The annular projection 425 provides an example of a deformation suppression part. The annular projection 425 provides an example of a projection.

[0056] The annular projection 425 can be formed by machining and provided integrally with the base member 21. When forming the annular projection 425 by machining, the machining of the annular projection 425 can be made easier by using a special cutting tool. Specifically, a round drill with a diameter slightly smaller than the diameter of the annular projection 425 is used as the special cutting tool. This allows machining to hollow out the circular recess on the inside of the annular projection 425. Alternatively, a drill with a semicircular notch, with a diameter slightly larger than the diameter of the annular projection 425 from the center of the rotation axis, is used as the special cutting tool. This allows machining to remove the recess on the outside of the annular projection 425 without interfering with the annular projection 425. Or, a drill with a recess of the same shape as the annular projection 425 at its tip is used as the special cutting tool. This allows machining to remove both the inside and outside of the annular projection 425 at once. Thus, the annular projection 425 can be manufactured with increased efficiency by devising cutting tools used for the cutting process.

[0057] The effects of the above-described embodiment will now be explained. According to the above-described embodiment, the housing member 20 is provided with an annular projection 425. Here, the annular projection 425 is easier to process than when the projection is machined in a shape other than an annular one. For this reason, the manufacturability of the electronic device 100 is easier to improve compared to when the projection that functions as a deformation suppressor is in a shape other than an annular one.

[0058] (Fifth embodiment) This embodiment is a modification based on the preceding embodiment. In this embodiment, a U-shaped projection 525 is formed around the housing member hole 23.

[0059] In Figure 9, the base member 21 is provided with a U-shaped projection 525. The U-shaped projection 525 comprises a straight portion 525C and a connecting portion 525S. The straight portions 525C are provided on both sides of the housing member hole 23. In other words, the housing member hole 23 is positioned between two straight portions 525C that are arranged side by side in the left-right direction. Both straight portions 525C are triangular prisms and are identical in shape to each other.

[0060] The connecting portion 525S is the part that connects the end of one linear portion 525C to the end of the other linear portion 525C. Because the two linear portions 525C are connected by the connecting portion 525S, the overall shape of the projection is U-shaped. The U-shaped projection 525 provides an example of a deformation suppression portion. The U-shaped projection 525 provides an example of a projection.

[0061] The effects of the above-described embodiment will now be explained. According to the above-described embodiment, the housing member 20 is provided with a U-shaped projection 525. Therefore, compared to the case where the projection is an annular shape, the linear portion 525C can effectively suppress deformation due to sliding in the longitudinal direction of the cover member 40.

[0062] (Sixth Embodiment) This embodiment is a modification based on the preceding embodiment. In this embodiment, a linear groove 625 is formed around the housing member hole 23.

[0063] In Figure 10, the base member 21 is provided with a linear groove 625. The linear groove 625 is a recessed portion compared to the surface of the base member 21. The linear groove 625 is a rectangular groove extending in the vertical direction. The shape of the linear groove 625 is not limited to a rectangle. A trapezoid or a rounded rectangle may be used as the shape of the linear groove 625.

[0064] The linear grooves 625 are provided on both sides of the housing member hole 23. In other words, one housing member hole 23 is provided between two linear grooves 625 that are arranged side by side in the left-right direction. The two linear grooves 625 are identical in shape. However, the two linear grooves 625 may have different shapes. The two linear grooves 625 are provided parallel to each other. The distance from the housing member hole 23 located between the two linear grooves 625 to the two linear grooves 625 is equal in size.

[0065] In Figure 11, the base member 21 and the plate-shaped member 41 are fastened and fixed together by bolts 60 while in contact with each other. Therefore, the linear groove 625 can be said to be provided on the contact surface between the base member 21 and the plate-shaped member 41. The direction of indentation of the linear groove 625 coincides with the axial direction of the bolts 60. The linear groove 625 provides an example of a deformation suppression part. The linear groove 625 provides an example of a groove.

[0066] The straight groove 625 is located around the bolt 60. More specifically, the installation distance L2, which is the shortest distance from the central axis C1 to the straight groove 625, is less than three times the radius of the head 62.

[0067] The portion of the plate-shaped member 41 facing the linear groove 625 is embedded in the linear groove 625. However, it can also be said that the corners of the linear groove 625 are embedded in the plate-shaped member 41. In other words, due to the axial force applied by the bolt 60, a portion of the plate-shaped member 41 is deformed while it is in contact with the base member 21. This is because the rigidity of the base member 21 is higher than that of the plate-shaped member 41. If the base member 21 were a softer material than the plate-shaped member 41, the linear groove 625 would be provided in the plate-shaped member 41, causing a portion of the base member 21 to be embedded in it. The deformation of the plate-shaped member 41 being embedded in the linear groove 625 occurs when the cover member 40 is assembled to the housing member 20 and fastened and fixed with the bolt 60. Even if the axial force of the bolt 60 decreases after fastening and fixing with the bolt 60, the state in which the plate-shaped member 41 is bitten into the linear groove portion 625 is maintained.

[0068] The portion of the plate-shaped member 41 facing the linear groove 625 can be described as a low-rigidity portion, having relatively lower rigidity compared to the linear groove 625. Conversely, the linear groove 625 can be described as a high-rigidity portion, having relatively higher rigidity compared to the portion of the plate-shaped member 41 facing the linear groove 625. Therefore, the portion of the plate-shaped member 41 facing the linear groove 625, which is the low-rigidity portion, can be said to be biting into the linear groove 625, which is the high-rigidity portion. Alternatively, the linear groove 625, which is the high-rigidity portion, and the portion of the plate-shaped member 41 facing the linear groove 625, which is the low-rigidity portion, can be described as being engaged with each other.

[0069] Because the plate-shaped member 41 is embedded in the linear groove 625, movement of the plate-shaped member 41 in the direction of sliding relative to the surface of the base member 21 is suppressed. Therefore, it can be said that the movement of the plate-shaped member 41 relative to the base member 21 is suppressed by the embedding of the plate-shaped member 41 in the bolt 60 and the linear groove 625.

[0070] The effects of the above-described embodiment will now be explained. According to the above-described embodiment, the housing member 20 is provided with a linear groove 625 that is recessed from the surface of the base member 21. Therefore, the cover member 40, which has relatively lower rigidity than the housing member 20, can be bitten into the linear groove 625. Thus, in addition to the bolts 60, the movement of the cover member 40 relative to the housing member 20 is also suppressed by the linear groove 625.

[0071] The linear groove 625 is recessed compared to the surface of the base member 21. Therefore, compared to a configuration where the groove protrudes from the surface of the base member 21 to cause the housing member 20 and the cover member 40 to interlock, machining is easier. In other words, since only the recessed portion needs to be machined rather than the protruding portion, machining is easier and manufacturability is improved.

[0072] (Seventh Embodiment) This embodiment is a modification based on the preceding embodiment. In this embodiment, an annular groove 725 is formed around the housing member hole 23.

[0073] In Figure 12, the base member 21 is provided with an annular groove 725. The annular groove 725 is a recessed portion compared to the surface of the base member 21. The annular groove 725 is provided around the housing member hole 23. The central axis of the annular groove 725 coincides with the central axis of the housing member hole 23.

[0074] In Figure 13, the base member 21 and the plate-shaped member 41 are fastened and fixed together by bolts 60 while in contact with each other. Therefore, it can be said that the annular groove 725 is provided on the contact surface between the base member 21 and the plate-shaped member 41. The direction of indentation of the annular groove 725 coincides with the axial direction of the bolts 60. The annular groove 725 provides an example of a deformation suppression part. The annular groove 725 provides an example of a groove.

[0075] A portion of the plate-shaped member 41 is embedded in the annular groove 725. However, it can also be said that the corners of the annular groove 725 are embedded in the plate-shaped member 41. The embedding of the plate-shaped member 41 in the annular groove 725 suppresses its movement in the direction of sliding relative to the surface of the base member 21. Therefore, it can be said that the movement of the plate-shaped member 41 relative to the base member 21 is suppressed by the embedding of the plate-shaped member 41 in the bolt 60 and the annular groove 725.

[0076] (Other embodiments) The disclosures in this specification and drawings are not limited to the exemplary embodiments. The disclosures include the exemplary embodiments and variations thereof by those skilled in the art. For example, the disclosures are not limited to combinations of parts and / or elements shown in the embodiments. The disclosures are implementable in a variety of combinations. The disclosures may have additional parts that can be added to the embodiments. The disclosures include those in which parts and / or elements of the embodiments have been omitted. The disclosures include substitutions or combinations of parts and / or elements between one embodiment and another. The scope of the disclosed technical areas is not limited to the descriptions of the embodiments. Some of the scope of the disclosed technical areas are indicated by the claims and should be understood to include all modifications within the meaning and scope equivalent to the claims.

[0077] The disclosures in the specification and drawings are not limited by the claims. The disclosures in the specification and drawings encompass the technical ideas described in the claims and extend to a wider and more diverse range of technical ideas than those described in the claims. Therefore, a variety of technical ideas can be extracted from the disclosures in the specification and drawings without being bound by the claims. [Explanation of Symbols]

[0078] 10 Case, 20 Housing member, 21 Base member, 23 Housing member hole, 25 Linear projection, 29 Lid member, 40 Cover member, 41 Plate-shaped member, 42 Packing member, 43 Cover through hole, 50 Circuit board, 53 Connector, 60 Bolt, 61 Shaft, 62 Head, 100 Electronic device, 225 Linear projection, 325 Linear projection, 325P Projection piece, 425 Annular projection, 525 U-shaped projection, 525C Linear part, 525S Connection part, 625 Linear groove, 725 Annular groove

Claims

1. An electronic device comprising a circuit board (50) and a case (10) housing the circuit board, The aforementioned case is, Cover member (40) and A housing member (20) having a different rigidity from the cover member and forming at least a part of the housing space housing the circuit board, A fixing member (60) is inserted through a cover through-hole (43) provided in the cover member and a housing member hole (23) provided in the housing member, thereby fixing the cover member and the housing member in contact with each other. An electronic device comprising deformation suppression portions (25, 225, 325, 425, 525, 625, 725) formed on the member with higher rigidity between the cover member and the housing member, and in a fixed state in which the cover member and the housing member are fixed to each other by the fixing member, the cover member and the housing member bite into each other.

2. The cover member is rectangular in shape, The electronic device according to claim 1, wherein the deformation suppression portion comprises linear portions (25, 225, 325, 525C, 625) extending along the short direction of the cover member.

3. The electronic device according to claim 2, wherein a plurality of the linear portions are provided on both sides of the fixing member.

4. The electronic device according to claim 3, wherein the deformation suppression portion comprises a connecting portion (525S) that connects a plurality of the linear portions.

5. The deformation suppressing portion is a projection that protrudes from the surface on which the deformation suppressing portion is provided, The electronic device according to claim 2, wherein the linear portion is provided with a plurality of protruding pieces (325P) arranged linearly along the shorter direction.

6. The electronic device according to claim 1, wherein the deformation suppression portion is provided in an annular shape so as to surround the fixing member.

7. The electronic device according to claim 1, wherein the deformation suppression portion is a projection (25, 225, 325, 425, 525) that protrudes from the surface on which the deformation suppression portion is provided.

8. The electronic device according to claim 7, wherein the amount of protrusion of the projection is less than or equal to half the thickness of the cover member.

9. The electronic device according to claim 1, wherein the deformation suppression portion is a groove (625, 725) that is recessed from the surface on which the deformation suppression portion is provided.

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