Electronic devices

Abstract

To provide an electronic device with a reduced number of components. [Solution] The electronic control device 100 is mounted on the mounting surface of a vehicle. The electronic control device 100 comprises a circuit board 10 and a housing on which the circuit board 10 is arranged. The circuit board 10 has circuit elements 12 and connectors 13 mounted on a wiring board 11. The housing has annular side walls 22, 24 and a bottom wall 25. The housing has an opening 29a facing the bottom surface 25s, which is the surface facing the circuit board 10.

Description

Technical Field

[0001] This disclosure relates to an electronic device.

Background Art

[0002] Conventionally, as an example of an electronic device, there is an electronic control device disclosed in Patent Document 1. The electronic control device includes a circuit board, a case, and a cover. The circuit board is screwed to the bottom surface of the case. The cover is screwed to the upper surface of the case.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The electronic control device requires screws for fixing the cover to the case. Therefore, the electronic control device has a problem that the number of parts increases by the number of screws. Also, from this perspective or other perspectives not mentioned, further improvements are required for the electronic device.

[0005] The disclosed object is to provide an electronic device with a reduced number of parts.

Means for Solving the Problems

[0006] The electronic device disclosed herein is an electronic device mounted on a mounting surface (201) in a vehicle, comprising a circuit board (10) on which electronic components (12, 13) are mounted, and a housing (20) in which the circuit board is disposed, where the housing has an opening (29a) facing at least one surface of the surface facing the circuit board.

[0007] Thus, the electronic device has a housing with openings. Therefore, the electronic device does not need to screw the housing and the cover that closes the openings together. Consequently, the number of parts in the electronic device can be reduced.

[0008] Furthermore, the electronic devices disclosed herein are An electronic device mounted on the mounting surface (201) of a vehicle, A circuit board (10) on which electronic components (12,13) ​​are mounted, The device comprises a housing (20) on which a circuit board is arranged, The enclosure has an opening (29a) facing at least one surface that faces the circuit board, and the opening is covered by the mounting surface.

[0009] Thus, the electronic device has a configuration in which the opening is covered by the mounting surface. Therefore, the electronic device does not need to screw together the housing and the cover that seals the opening. Thus, the number of parts in the electronic device can be reduced.

[0010] The various embodiments disclosed in this specification employ different technical means to achieve their respective objectives. The claims and the reference numerals in parentheses in this section are intended to illustrate an example of correspondence with parts of the embodiments described later, and are not intended to limit the technical scope. The objectives, features, and effects disclosed in this specification will become clearer by referring to the subsequent detailed description and the accompanying drawings. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view showing the schematic configuration of the electronic control device in the first embodiment. [Figure 2] This is a plan view from the direction of arrow II in Figure 1. [Figure 3] This is a cross-sectional view along line III-III in Figure 2. [Figure 4] This is a cross-sectional view of the electronic control device of modified example 1. [Figure 5] Cross-sectional view of the electronic control device of Modification 2. [Figure 6] Cross-sectional view of the electronic control device of the second embodiment. [Figure 7] Plan view of the electronic control device of the third embodiment. [Figure 8] Cross-sectional view taken along line VIII-VIII of FIG. 7. [Figure 9] Cross-sectional view of the electronic control device of Modification 3. [Figure 10] Cross-sectional view of the electronic control device of Modification 4. [Figure 11] Cross-sectional view of the electronic control device of the fourth embodiment. [Figure 12] Cross-sectional view of the electronic control device of Modification 5. [Figure 13] Plan view of the electronic control device of the fifth embodiment. [Figure 14] Cross-sectional view taken along line XIV-XIV of FIG. 13. [Figure 15] Cross-sectional view of the electronic control device of Modification 6. [Figure 16] Cross-sectional view of the electronic control device of the sixth embodiment. [Figure 17] Cross-sectional view of the electronic control device of the seventh embodiment. [Figure 18] Cross-sectional view of the electronic control device of the eighth embodiment. [Figure 19] Cross-sectional view of the electronic control device of Modification 7. [Figure 20] Plan view of the electronic control device of the ninth embodiment. [Figure 21] Cross-sectional view taken along line XXI-XXI of FIG. 20. [Figure 22] Cross-sectional view of the electronic control device of the tenth embodiment.

Embodiments for Carrying Out the Invention

[0012] In the following, several embodiments for implementing this disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to matters described in a previous embodiment may be denoted by the same reference numerals, and redundant explanations may be omitted. In each embodiment, if only a part of the configuration is described, the other parts of the configuration can be referred to and applied to other embodiments described in advance. In the following, the three mutually orthogonal directions will be referred to as the X direction, Y direction, and Z direction.

[0013] (First Embodiment) The electronic control unit 100 of the first embodiment will be described with reference to Figures 1 to 3. As shown in Figure 1, the electronic control unit 100 is configured to be mounted on the vehicle's mounting section 200. That is, the electronic control unit 100 is mounted on the mounting surface 201 of the mounting section 200. Note that the electronic control unit 100 is shown in a simplified form in Figure 1.

[0014] As shown in Figures 2 and 3, the electronic control unit 100 comprises a circuit board 10 and a housing 20 in which the circuit board 10 is arranged. The electronic control unit 100 corresponds to an electronic device.

[0015] In this embodiment, as an example, an electronic control device 100 equipped with one circuit board 10 is employed. However, the electronic control device 100 may be equipped with multiple circuit boards 10. For example, multiple circuit boards 10 are stacked in the Z direction and electrically connected via inter-board connectors or the like. Inter-board connectors are sometimes referred to as BtoB connectors.

[0016] <Circuit board> As shown in Figures 2 and 3, the circuit board 10 comprises a wiring board 11, a circuit element 12, and a connector 13. The circuit board 10 comprises an electrically insulating substrate and conductive wiring provided on the substrate. The wiring board 11 has one surface 11s1 and a back surface 11s2 which is the opposite surface of the one surface 11s1. The wiring board 11 also has multiple sides that are connected to the one surface 11s1 and the back surface 11s2. The multiple sides are arranged in an annular shape.

[0017] One surface 11s1 and the back surface 11s2 have, for example, a rectangular shape. In this case, the wiring board 11 has four sides. One surface 11s1 and the back surface 11s2 are surfaces that align with the XY plane. The XY plane is a plane defined by the X-axis extending in the X direction and the Y-axis extending in the Y direction.

[0018] The wiring board 11 has a circuit element 12 and a connector 13 mounted on it as examples of electronic components. The circuit element 12 and the connector 13 are mounted on at least one of the front side 11s1 and the back side 11s2. The circuit element 12 and the connector 13 are electrically connected to the wiring of the wiring board 11. In this embodiment, as an example, the connector 13 is mounted on the front side 11s1 and the circuit element 12 is mounted on the back side 11s2. The circuit element 12 may also be mounted on the front side 11s1. The connector 13 may also be mounted on the back side 11s2.

[0019] At least one circuit element 12 is mounted on the wiring board 11. Therefore, the wiring board 11 may have multiple circuit elements 12 mounted on it. Similarly, at least one connector 13 is mounted on the wiring board 11. Therefore, the wiring board 11 may have multiple connectors 13 mounted on it. The circuit elements 12 are, for example, a microcomputer, a semiconductor switching element, a capacitor, a resistor, a coil, etc.

[0020] <Enclosure> As shown in Figures 2 and 3, the housing 20 is mainly composed of a metal such as aluminum. The housing 20 has side walls 21-24 and a bottom wall 25. The side walls 21-24 are arranged in an annular pattern. The bottom wall 25 is arranged in conjunction with the side walls 21-24. The housing 20, with its side walls 21-24 and bottom wall 25, forms a space for housing the circuit board 10.

[0021] A bottom wall portion 25 is provided at one end of each side wall portion 21-24. An end face 20s is provided at the other end of each side wall portion 21-24. The end face 20s is the surface facing the mounting surface 201. For example, the housing 20 is mounted on the mounting portion 200 with its end face 20s in contact with the mounting surface 201.

[0022] However, the housing 20 does not necessarily have to have its end face 20s and mounting surface 201 facing each other. In other words, the housing 20 may be attached to the mounting section 200 without the opening 29a, which will be explained later, being closed.

[0023] Side wall portions 21 and 23 are arranged opposite each other. Side wall portions 22 and 24 are arranged opposite each other. Side wall portion 24 is provided with a connector mounting portion on which the connector 13 is placed. The connector mounting portion is a through hole provided in side wall portion 24. The connector mounting portion may be a recessed area that is recessed relative to the end face 20s.

[0024] The side walls 21-24 face each side of the wiring board 11. The bottom wall 25 faces the wiring board 11. The bottom wall 25 has a bottom surface 25s that faces the back surface 11s2. The bottom surface 25s corresponds to the surface facing the circuit board 10. "Facing the wiring board 11" can be considered synonymous with "facing the circuit board 10".

[0025] The housing 20 is provided with an opening 29a facing the bottom surface 25s. The housing 20 is provided with an opening 29a that opens up the entire area of ​​the opposing region of one surface 11s1 in the Z direction, for example. Therefore, when the circuit board 10 is mounted on the housing 20, one surface 11s1 is exposed from the housing 20. In other words, as shown in Figure 2, the electronic control device 100 is configured so that almost the entire area of ​​one surface 11s1 is visible from the Z direction. Almost the entire area is the area where the connector 13 and circuit elements 12 are not implemented, and the area where the screw members 40 are not provided.

[0026] Furthermore, the housing 20 can be described as having a shape where one face is missing in a hollow hexahedron. Moreover, the electronic control device 100 can be described as having a circuit board 10 arranged in a housing 20 that does not have a cover.

[0027] Incidentally, the circuit board 10 is mounted on the housing 20 such that the circuit elements 12 face the bottom surface 25s. The circuit elements 12 are elements that generate heat when they operate. The circuit elements 12 can also be called heat-generating elements. Multiple circuit elements 12, including heat-generating elements, are mounted on the wiring board 11.

[0028] A heat dissipation member 30 is provided between the circuit element 12 (heat-generating element) and the bottom surface 25s. The heat dissipation member 30 is a member that reduces the thermal resistance between the circuit element 12 and the bottom wall portion 25. The heat dissipation member 30 is a heat dissipation sheet or heat dissipation gel. The heat dissipation member 30 is in contact with the circuit element 12 and the bottom surface 25s. The heat dissipation member 30 is provided only for the elements in the multiple circuit elements 12 mounted on the wiring board 11 that require cooling. Therefore, a heat-generating element can also be said to be an element that generates heat to the extent that cooling is required.

[0029] The bottom wall portion 25 is provided with a fixed base 27. The fixed base 27 is provided so as to protrude in the Z direction relative to the bottom surface 25s. The circuit board 10 is placed on the fixed base 27.

[0030] The fixing base 27 is provided with a female thread corresponding to the screw member 40. The screw member 40 is a bolt with a male thread. The wiring board 11 is provided with a screw hole into which the screw member 40 is inserted.

[0031] The circuit board 10 is placed on a fixing base 27 and secured to the housing 20 by screw members 40. The screw members 40 can also be called fixing members for the circuit board.

[0032] Furthermore, the electronic control unit 100 has a facing space 29b formed between the back surface 11s2 and the bottom surface 25s. In other words, the circuit board 10 is not sealed with potting material or the like.

[0033] The bottom wall portion 25 has multiple heat dissipation fins 28 on the side opposite to the housing space. The bottom wall portion 25 has multiple heat dissipation fins 28 on the side opposite to the bottom surface 25s. The heat dissipation fins 28 are portions that protrude from the side opposite to the bottom surface 25s.

[0034] Some of the side wall portions 22 and 24 are provided with fixing portions 26. The fixing portions 26 are provided so as to protrude in the X direction from the side wall portions 22 and 24. The fixing portions 26 are provided on the end face 20s side of the side wall portions 22 and 24 rather than on the bottom wall portion 25 side. The fixing portions 26 are for fixing the electronic control device 100 to the mounting portion 200.

[0035] The fixing part 26 is provided with a screw hole 26h (female thread) corresponding to the screw member 50. The screw member 50 is a bolt with a male thread. The electronic control device 100 is placed on the mounting part 200 and fixed to the mounting part 200 by the screw member 50. The screw member 50 can also be called a housing fixing member.

[0036] In this embodiment, a housing 20 provided with four fixing parts 26 is used as an example. However, the housing 20 only needs to have at least two fixing parts 26.

[0037] <Effects> Thus, the electronic control unit 100 is equipped with a housing 20 having an opening 29a. Therefore, the electronic control unit 100 does not need to screw the housing 20 and the cover that closes the opening 29a together. Thus, the electronic control unit 100 can reduce the number of parts. In other words, the electronic control unit 100 can reduce the number of parts by eliminating the cover and screw members.

[0038] In particular, as the size of the electronic control unit 100 increases, the number of screw components also increases. An increase in the number of screw components in the electronic control unit 100 increases costs, weight, and the number of screw fastening steps. Furthermore, an increase in the number of screw components also increases the size of the electronic control unit 100. However, because the cover of the electronic control unit 100 is not screwed in, costs can be reduced, weight can be reduced, and the number of steps can be decreased. Additionally, because the cover is not screwed in, the size of the electronic control unit 100 can be made smaller.

[0039] Furthermore, the electronic control unit 100 may be installed in the harsh environment of a vehicle. Also, the electronic control unit 100 is transported from the place where it is manufactured to the place where the vehicle is assembled. Generally, the electronic control unit is provided with a housing that encloses the entire area of ​​the wiring board 11 and circuit elements 12 in order to protect the wiring board and circuit elements.

[0040] In this case, the enclosure consists of the enclosure 20 and a cover that closes the opening 29a. In other words, an electronic control device may be equipped with an enclosure to prevent dust and conductive debris from adhering to the wiring board and electronic components, that is, to protect the wiring board and electronic components. However, the electronic control device 100 is equipped with an enclosure 20 that has an opening 29a in order to reduce the number of components.

[0041] In this embodiment, as an example, a housing 20 is used which has an opening 29a facing the bottom surface 25s, which is the surface facing the back surface 11s2. However, the housing 20 may also have an opening 29a facing the surface facing the side surface of the wiring board 11. In other words, the housing 20 may have an opening 29a facing one of the side surfaces of the wiring board 11.

[0042] (Variation 1) The electronic control device 100 of Modified Example 1 will be explained using Figure 4. Figure 4 is a cross-sectional view corresponding to Figure 3.

[0043] As shown in Figure 4, the electronic control unit 100 includes a housing 20 with a fixing portion 261 provided on its end face 20s. The fixing portion 261 has a claw portion at its tip and is an elastically deformable part. In this case, the mounting portion 200 is provided with an insertion hole into which the fixing portion 261 is inserted and a recess corresponding to the claw portion of the fixing portion 261.

[0044] The housing 20 is attached to the mounting section 200 by a fixing part 261 instead of a screw member 50. The electronic control device 100 of Modified Example 1 can achieve the same effects as the above embodiment. Furthermore, when the electronic control device 100 of Modified Example 1 is attached to the mounting section 200, the screw member 50 is unnecessary, thus reducing the number of parts compared to the above embodiment.

[0045] (Modification 2) The electronic control device 100 of the modified example 2 will be explained using Figure 5. Figure 5 is a cross-sectional view corresponding to Figure 3.

[0046] As shown in Figure 5, the electronic control unit 100 includes a housing 20 with a fixing portion 262 provided on its end face 20s. The fixing portion 262 is a rod-shaped part with a protrusion at its tip. In this case, the mounting portion 200 is provided with an insertion hole into which the fixing portion 262 is inserted, and a fitting recess corresponding to the protrusion of the fixing portion 262. The fixing portion 262 is press-fitted into the mounting portion 200.

[0047] The housing 20 is attached to the mounting section 200 by a fixing part 262 instead of a screw member 50. The electronic control device 100 of Modification 2 can achieve the same effects as the above embodiment. Furthermore, when the electronic control device 100 of Modification 2 is attached to the mounting section 200, the screw member 50 is unnecessary, thus reducing the number of parts compared to the above embodiment. The housing 20 may also be attached to the mounting section 200 by sliding. Modifications 1 and 2 can be applied to other embodiments and other modifications.

[0048] (Second Embodiment) The electronic control device 100 of the second embodiment will be described with reference to Figure 6. Figure 6 is a cross-sectional view corresponding to Figure 3.

[0049] As shown in Figure 6, the electronic control unit 100 comprises a circuit board 10 and a housing 20 similar to those in the above embodiment. The electronic control unit 100 has a configuration in which the opening 29a is covered by the mounting surface 201. In other words, the opening 29a is closed by the mounting surface 201. Therefore, the mounting portion 200 can also be considered as one of the components of the electronic control unit 100.

[0050] The electronic control device 100 of the second embodiment can achieve the same effects as the first embodiment. The electronic control device 100 of the second embodiment can suppress the adhesion of dust and conductive debris to the wiring board 11 and electronic components 12, 13.

[0051] (Third embodiment) The electronic control device 100 of the third embodiment will be described with reference to Figures 7 and 8. Figure 7 is a plan view corresponding to Figure 2.

[0052] As shown in Figures 7 and 8, the electronic control unit 100 is equipped with a protective film 60 in addition to the configuration of the first embodiment. The protective film 60 is provided on the end face 20s. The protective film 60 is provided so as to cover the opening 29a. The opening 29a is closed by the protective film 60. The protective film 60 is a non-rigid body provided, for example, with resin as its main component.

[0053] The protective film 60 has an adhesive function. Therefore, the protective film 60 is adhered to the end face 20s. However, the protective film 60 may also be adhered to the end face 20s via an adhesive. The protective film 60 may also be detachably attached to the housing 20.

[0054] The electronic control device 100 of the third embodiment can reduce the number of parts by eliminating the screw members. Furthermore, the electronic control device 100 of the third embodiment can suppress the adhesion of dust and conductive debris to the wiring board 11 and electronic components 12 and 13.

[0055] The protective film 60 may be attached only during transport of the electronic control unit 100. In this case, the electronic control unit 100 can be protected from dust and conductive debris during transport.

[0056] (Variation 3) The electronic control device 100 of the modified example 3 will be explained using Figure 9. Figure 9 is a cross-sectional view corresponding to Figure 3.

[0057] As shown in Figure 9, the electronic control unit 100 is equipped with a flexible protective film 60. That is, the protective film 60 is attached to the housing 20 in a flexible state. The protective film 60 is bonded to the end face 20s. The opening 29a is covered by the protective film 60.

[0058] The electronic control unit 100 of Modified Example 3 can achieve the same effects as the third embodiment. Furthermore, the protective film 60 can conform to irregularities even if they are formed on the mounting surface 201. Therefore, the electronic control unit 100 of Modified Example 3 can prevent the protective film 60 from tearing due to irregularities on the mounting surface 201.

[0059] (Modification 4) The electronic control device 100 of the modified example 4 will be explained using Figure 10. Figure 10 is a cross-sectional view corresponding to Figure 3.

[0060] As shown in Figure 10, the electronic control unit 100 includes a protective film 60 attached to the circuit board 10. The protective film 60 is adhered to the end face 20s. The protective film 60 is also in contact with one side 11s1 and the connector 13. The electronic control unit 100 of Modification 4 can achieve the same effects as Modification 3.

[0061] (Fourth Embodiment) The electronic control device 100 of the fourth embodiment will be described with reference to Figure 11. Figure 11 is a cross-sectional view corresponding to Figure 3.

[0062] As shown in Figure 11, the electronic control unit 100, like the second embodiment, comprises a circuit board 10 and a housing 20, and has a configuration in which the opening 29a is covered by a mounting surface 201. Furthermore, the electronic control unit 100, like the third embodiment, is equipped with a protective film 60. In other words, the fourth embodiment is a combination of the second and third embodiments. The electronic control unit 100 of the fourth embodiment can achieve the same effects as the second and third embodiments.

[0063] (Variation 5) The electronic control device 100 of the modified example 5 will be explained using Figure 12. Figure 12 is a cross-sectional view corresponding to Figure 3.

[0064] As shown in Figure 12, the electronic control unit 100 includes a protective film 60 attached to the mounting surface 201. The protective film 60 is adhered to the mounting surface 201. The mounting surface 201 is provided with a recess 210. The protective film 60 is provided along the recess 210. The protective film 60 is also in contact with the end surface 20s. The electronic control unit 100 of Modification 5 can achieve the same effects as Modification 3.

[0065] (Fifth embodiment) The electronic control device 100 of the fifth embodiment will be described with reference to Figures 13 and 14. Figure 13 is a plan view corresponding to Figure 2.

[0066] As shown in Figures 13 and 14, the electronic control unit 100 is equipped with a protective film 70 in addition to the configuration of the first embodiment. The protective film 70 is provided on the surface of the circuit board 10 that faces the opening 29a. In other words, the protective film 70 is provided on one surface 11s1. Furthermore, the protective film 70 is coated on one surface 11s1. The circuit board 10 is screwed to the housing 20 with the protective film 70 provided.

[0067] The electronic control device 100 of the fifth embodiment can achieve the same effects as the first embodiment. The electronic control device 100 of the fifth embodiment can reduce the number of parts by eliminating the screw member. Furthermore, the electronic control device 100 of the fifth embodiment can suppress the adhesion of dust and conductive debris to the wiring board 11 and electronic components 12, 13.

[0068] (Experimental variation 6) The electronic control device 100 of the modified example 6 will be explained using Figure 15. Figure 15 is a cross-sectional view corresponding to Figure 3.

[0069] As shown in Figure 15, the electronic control device 100 has a protective film 70 on one surface 11s1. The fixing portion 26 is provided on the bottom wall portion 25 side of the side wall portions 22 and 24 rather than on the end face 20s side.

[0070] The housing 20 does not have heat dissipation fins 28. In other words, the bottom wall portion 25 has a flat surface 25s1 opposite the bottom surface 25s. The opposite surface 25s1 is the surface facing the mounting surface 201. In Modification 6, the electronic control device 100 is mounted on the mounting portion 200 without the opening 29a being covered. The electronic control device 100 of Modification 6 can achieve the same effects as the fifth embodiment. Modification 6 can be applied to other embodiments and modifications. Furthermore, other embodiments and other modifications can use the housing 20 of Modification 6.

[0071] (Sixth Embodiment) The electronic control device 100 of the sixth embodiment will be described with reference to Figure 16. Figure 16 is a cross-sectional view corresponding to Figure 3.

[0072] As shown in Figure 16, the electronic control unit 100, like the second embodiment, comprises a circuit board 10 and a housing 20, and has a configuration in which the opening 29a is covered by a mounting surface 201. Furthermore, the electronic control unit 100, like the fifth embodiment, is equipped with a protective film 70. In other words, the sixth embodiment is a combination of the second and fifth embodiments. The electronic control unit 100 of the sixth embodiment can achieve the same effects as the second and fifth embodiments.

[0073] (Seventh Embodiment) The electronic control device 100 of the seventh embodiment will be described with reference to Figure 17. Figure 17 is a cross-sectional view corresponding to Figure 3.

[0074] As shown in Figure 17, the mounting section 200 is provided with a plurality of air passages 220 that open into the mounting surface 201. The mounting section 200 is provided with a plurality of air passages 220 to cool the circuit board 10. The plurality of air passages 220 are holes that communicate with the opening 29a. In other words, the housing 20 is mounted on the mounting surface 201 with the opening 29a communicating with the air passages 220. Cooling air is supplied from at least one air passage 220 to the opening 29a and discharged from the opening 29a to the other air passages 220.

[0075] The electronic control device 100 of the seventh embodiment can achieve the same effects as the second embodiment. Furthermore, the electronic control device 100 of the seventh embodiment can cool the circuit board 10 (circuit elements 12) with air, thereby improving the heat dissipation of the circuit board 10. It is preferable that the electronic control device 100 of the seventh embodiment is provided with the protective film 60 of Modification 4 or the protective film 70 of the fifth embodiment.

[0076] In the seventh embodiment, the electronic control unit 100 is cooled by air. For this reason, in this embodiment, as an example, a housing 20 without heat dissipation fins 28 is used. However, the housing 20 may be provided with heat dissipation fins 28.

[0077] (Eighth embodiment) The electronic control device 100 of the eighth embodiment will be described with reference to Figure 18. Figure 18 is a cross-sectional view corresponding to Figure 3.

[0078] As shown in Figure 18, the electronic control unit 100 has a circuit board 10 mounted on the mounting surface 201. That is, one side 11s1 of the wiring board 11 is in contact with the mounting surface 201. The wiring board 11 is fixed to the mounting section 200 by a screw member 40. The electronic control unit 100 of the eighth embodiment can achieve the same effects as the second embodiment.

[0079] (Example 7) The electronic control device 100 of the modified example 7 will be explained using Figure 19. Figure 19 is a cross-sectional view corresponding to Figure 3.

[0080] As shown in Figure 19, the electronic control unit 100 includes a housing 20 provided with a substrate holder portion 27a. The substrate holder portion 27a protrudes from the side walls 21-24 in the XY plane direction. The substrate holder portion 27a is provided with through holes into which fixing pins 40a are inserted. The circuit board 10 is fixed (mounted) to the mounting surface 201 together with the substrate holder portion 27a using the fixing pins 40a. The electronic control unit 100 of the modified example 7 can achieve the same effects as the eighth embodiment.

[0081] (Ninth Embodiment) The electronic control device 100 of the ninth embodiment will be described with reference to Figures 20 and 21. Figure 20 is a plan view corresponding to Figure 2.

[0082] As shown in Figures 20 and 21, the electronic control unit 100 includes a heat dissipation sheet 80 in addition to the configuration of the first embodiment. The heat dissipation sheet 80 is provided on the surface of the circuit board 10 that faces the opening 29a. In other words, the heat dissipation sheet 80 is provided on one surface 11s1. The heat dissipation sheet 80 is provided on at least a portion of the one surface 11s1.

[0083] The heat dissipation sheet 80 is provided to reduce thermal resistance between the circuit board 10 (wiring board 11) and the mounting section 200. The circuit board 10 is screwed to the housing 20 with the heat dissipation sheet 80 attached.

[0084] The electronic control unit 100 of the ninth embodiment can achieve the same effects as the first embodiment. The electronic control unit 100 of the ninth embodiment can cool the circuit board 10 not only from the circuit element 12 side but also from the side 11s1. Therefore, the electronic control unit 100 of the ninth embodiment can improve heat dissipation compared to the first embodiment.

[0085] (Tenth embodiment) The electronic control device 100 of the tenth embodiment will be described with reference to Figure 22. Figure 22 is a cross-sectional view corresponding to Figure 3.

[0086] As shown in Figure 22, the electronic control unit 100, like the second embodiment, comprises a circuit board 10 and a housing 20, and has a configuration in which the opening 29a is covered by a mounting surface 201. Furthermore, the electronic control unit 100, like the ninth embodiment, is equipped with a heat dissipation sheet 80. In other words, the tenth embodiment is a combination of the second and ninth embodiments. The electronic control unit 100 of the tenth embodiment can achieve the same effects as the second and ninth embodiments.

[0087] Preferred embodiments of the present disclosure have been described above. The present disclosure is not limited to such embodiments or structures. The present disclosure encompasses a variety of modifications and variations within the scope of equivalents. In addition, while various combinations and forms are shown in the present disclosure, other combinations and forms that include only one, more, or fewer of these elements also fall within the scope and idea of ​​the present disclosure. [Explanation of Symbols]

[0088] 10...Circuit board, 11...Wiring board, 12...Circuit element, 13...Connector, 20...Housing, 21...Side wall, 22...Side wall, 23...Side wall, 24...Side wall, 25...Bottom wall, 26...Fixing part, 26h...Screw hole, 27...Fixing base, 28...Heat dissipation fin, 29a...Opening, 29b...Opposite space, 30...Heat dissipation member, 40, 50...Screw member, 11s1...One side, 11s2...Back side, 20s...End face, 25s...Bottom face, 100...Electronic control unit, 200...Mounting part, 201...Mounting surface

Claims

1. An electronic device mounted on the mounting surface (201) of a vehicle, A circuit board (10) on which electronic components (12, 13) are mounted, The system comprises a housing (20) on which the circuit board is arranged, The housing is an electronic device having an opening (29a) facing at least one surface of the housing that faces the circuit board.

2. An electronic device mounted on the mounting surface (201) of a vehicle, A circuit board (10) on which electronic components (12, 13) are mounted, The system comprises a housing (20) on which the circuit board is arranged, The housing has an opening (29a) facing at least one surface of the surface facing the circuit board, and the opening is covered by the mounting surface.

3. Furthermore, the electronic device according to claim 1 or 2, further comprising a protective film (60) covering the opening.

4. The electronic device according to claim 3, wherein the protective film is attached to the housing in a flexed state.

5. The electronic device according to claim 3, wherein the protective film is attached to the circuit board or the mounting surface.

6. Furthermore, the electronic device according to claim 1 or 2, further comprising a protective film (70) provided on the opposing surface of the circuit board facing the opening.

7. An air passage (220) is provided that opens to the mounting surface. The electronic device according to claim 2, wherein the housing is mounted on the mounting surface with the opening communicating with the air passage.

8. The electronic device according to claim 2, wherein the circuit board is mounted on the mounting surface.

9. Furthermore, the electronic device according to claim 1 or 2, further comprising a heat dissipation sheet (80) provided on the opposing surface of the circuit board facing the opening.

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