JP2020167289A - Electronic circuit device - Google Patents

Abstract

To provide an electronic circuit device capable of ensuring good waterproof performance while restraining cost increase.SOLUTION: The ventilation plug of an electronic circuit device includes a ventilation film, and a plug body having an opening covered with the ventilation film and a cylindrical part surrounding the opening. The case of the electronic circuit device includes a first recess opening to the cover side covering a circuit board, and into which a part of a member fixed to the case is inserted, an annular second recess formed at a bottom part to open to the cover side and into which the cylindrical part of the ventilation plug is inserted, and at least one ventilation hole penetrating the bottom part on the inside of the second recess, where the part of the member fixed to the case is fixed to the surface of the first recess via an adhesive agent, and the cylindrical part of the ventilation plug is fixed to the surface of the second recess via the adhesive agent.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an electronic circuit device including a ventilation plug fixed to a case.

Conventionally, a metal housing for accommodating an electronic circuit, a breathing filter attached to the housing with at least a part arranged in a through hole of the housing, and a housing for ensuring waterproofness inside the housing. An electronic device including an annular sealing member arranged between the body and a respiratory filter is known (see, for example, Patent Document 1). In this electronic device, the breathing filter includes a breathing membrane and a filter case to which the breathing membrane is attached, and the seal member is compressed by the housing and the filter case with the breathing filter attached to the housing. To. Further, in the housing, two contact surfaces in contact with the entire circumference of the seal member are formed at an angle, and between the intermediate wall surface sandwiched between the two contact surfaces on the surface of the housing and the seal member. Is formed with an annular void. As a result, even if gap corrosion progresses on one of the two contact surfaces to cause thinning or roughening, the seal member comes into contact with the other contact surface. Furthermore, the annular voids alleviate the concentration of ions that cause crevice corrosion.

Japanese Unexamined Patent Publication No. 2018-148089

However, in the above-mentioned conventional electronic device, it is necessary to accurately form two contact surfaces and an annular gap in the housing by cutting or the like, and when assembling the breathing filter and the seal member, the seal member and the contact surface are used. It must be managed so that foreign matter does not get in between. Therefore, it is difficult to suppress the cost increase with the above-mentioned conventional electronic device. Further, since it is not easy to secure a sufficient area of each contact surface without increasing the size of the housing, if the corrosion of the housing progresses, the waterproof performance of the electronic device deteriorates.

Therefore, a main object of the present disclosure is to provide an electronic circuit device capable of ensuring good waterproof performance while suppressing cost increase.

The electronic circuit device of the present disclosure includes a case including a bottom portion and a side wall portion extending along the outer periphery of the bottom portion, a circuit board arranged in the case, a connector connected to the circuit board, and the above. In an electronic circuit device including a cover covering a circuit board and a ventilation plug fixed to the case, the ventilation plug has a ventilation film, an opening covered by the ventilation film, and a tubular portion surrounding the opening. The case is formed in the bottom portion so as to open to the cover side and to have a first recess into which a part of a member fixed to the case is inserted. A part of the member fixed to the case, including an annular second recess into which the tubular portion of the vent plug is inserted, and at least one vent hole penetrating the bottom inside the second recess. Is fixed to the surface of the first recess via an adhesive, and the tubular portion of the ventilation plug is fixed to the surface of the second recess via an adhesive.

In the electronic circuit device of the present disclosure, the ventilation plug is fixed to the case by inserting the tubular portion of the plug body into the second recess formed at the bottom of the case and adhering it to the surface of the second recess with an adhesive. .. As a result, the ventilation plug can be liquid-tightly fixed to the case while reducing the cost by omitting the sealing member. Further, by aligning the opening directions of the first and second recesses, the ventilation plug and other members fixed to the case can be easily fixed to the case, and the manufacturing cost can be reduced. Further, since the surfaces of the first and second recesses are not required to have smoothness, it is possible to reduce the processing cost of the case. As a result, in the electronic circuit device of the present disclosure, it is possible to ensure good waterproof performance while suppressing cost increase.

It is sectional drawing which shows the electronic circuit apparatus of this disclosure. It is a top view which shows the electronic circuit apparatus of this disclosure. It is an enlarged view of the main part which shows the electronic circuit apparatus of this disclosure. It is an enlarged view of the main part which shows the electronic circuit apparatus of this disclosure. It is a bottom view which shows the electronic circuit apparatus of this disclosure. It is sectional drawing which shows the other electronic circuit apparatus of this disclosure.

Next, a mode for carrying out the invention of the present disclosure will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing the electronic circuit device 1 of the present disclosure, and FIG. 2 is a plan view showing the electronic circuit device 1 of the present disclosure. The electronic circuit device 1 shown in these drawings is fixed to a transmission case of a transmission mounted on a vehicle (not shown) and used as a control device for the transmission. The electronic circuit device 1 includes a circuit board 2, a connector 3 electrically connected to the circuit board 2, a case 4 to which the circuit board 2 and the connector 3 are fixed, and the entire circuit board 2 or a part of the connector 3. A cover 5 fixed to the case 4 so as to cover the case 4 and a ventilation plug (breather plug) 10 are included. Note that FIG. 2 shows an electronic circuit device 1 in a state where the cover 5 is not fixed to the case 4.

The circuit board 2 includes a plurality of substrates 21 made of resin such as glass epoxy, a power supply IC mounted on the substrate 21, a solenoid drive circuit for driving a linear solenoid valve of a hydraulic circuit, and a control IC for controlling the entire device. The electronic component 22 of the above is included. The connector 3 is used for electrical connection between the circuit board 2 and an external device (for example, another electronic control unit) (not shown). As shown in FIGS. 1 to 3, the connector 3 is formed on the lower surface in FIGS. 1 and 3 and the collar-shaped protrusion 31 protruding outward from the side surfaces on both sides, and on the upper surface in FIGS. 1 and 2. Includes recess 32. The recess 32 has a width slightly larger than the thickness of the protrusion 31, and overlaps with the protrusion 31 when the connector 3 is viewed in a plan view.

The case 4 is a cast product formed by casting a metal having high thermal conductivity such as an aluminum alloy, and is substantially perpendicular to the bottom portion 41 and the bottom portion 41 as shown in FIGS. 1 and 2. As described above, the side wall portion 45 extending along the outer periphery of the bottom portion 41 is included. A plurality of boss portions extend from the upper surface of the bottom portion 41, and the circuit board 2 is spaced from the bottom surface (upper surface in FIG. 1) of the bottom portion 41 via screws or adhesives to the plurality of boss portions. It is fixed at.

Further, the bottom 41 of the case 4 is formed with an annular plug fixing recess (second recess) 42 that opens on the upper side in FIG. 1, that is, on the circuit board 2 and the cover 5 side. In the present embodiment, the plug fixing recess 42 is an annular recess, and is formed on the bottom 41 so as not to overlap the circuit board 2 when the electronic circuit device 1 is viewed in a plan view. Further, on the radial inner side (center side) of the plug fixing recess 42, a communication recess 43 having a circular cross section and a plurality of (for example, three in this embodiment) ventilation holes (through holes) communicating with the communication recess 43 are provided. ) 44 and are formed. The plurality of ventilation holes 44 are all circular holes in the present embodiment, and are arranged at equal intervals along the inner peripheral surface of the communication recess 43. The plug fixing recess 42 may be a square tubular recess, the communication recess 43 may be a recess having a polygonal cross section, and the ventilation hole 44 may be a square hole.

Further, the side wall portion 45 of the case 4 is formed with a cover fixing recess 46 that is recessed from the upper end surface toward the bottom portion 41. The cover fixing recess 46 is a series of grooves that open on the upper side in FIG. 1, that is, on the cover 5 side. Further, as shown in FIG. 3, the side wall portion 45 is formed with a notch portion 47 into which the connector 3 is inserted from above. The notch 47 is a portion of the side wall 45 cut out according to the outer shape of the connector 3, and the bottom 41 and the side wall 45 of the case 4 extend along the notch 47 and are fixed to the cover. A connector fixing recess 48 continuous with the recess 46 is formed. That is, the connector fixing recess 48 also opens on the upper side in FIG. 1, that is, on the cover 5 side. The width (groove width) of the connector fixing recess 48 is defined to be larger than the thickness of the protruding portion 31 formed in the connector 3, and the depth of the connector fixing recess 48 is defined to be larger than the protruding length of the protruding portion 31. ing. Further, when the connector 3 is arranged in the notch 47, the recess 32 formed in the connector 3 is adjacent to the cover fixing recess 46 formed in the side wall 45 of the case 4.

The cover 5 is formed of a material (resin) having high corrosion resistance, for example, polybutylene terephthalate (PBT) resin. As shown in FIG. 1, the cover 5 has a lid portion 51 having a plane shape that is substantially similar to the bottom portion 41 of the case 4 and slightly larger than the bottom portion 41 so that the case 4 can be covered from above, and a lid portion. A cover side wall 52 formed along the outer periphery of the lid 51 so as to be substantially perpendicular to the 51 is included. In the present embodiment, a notch for suppressing interference with the connector 3 is formed in a portion of the cover side wall 52 located above the notch 47. Further, the inner surface of the lid portion 51 of the cover 5 has a thickness smaller than the width (groove width) of the recess 32 of the connector 3 and the width (groove width) of the cover fixing recess 46 of the side wall portion 45 of the case 4, and the recess 32. A convex portion 53 having a protrusion length smaller than the depth of the cover fixing recess 46 is formed over the entire outer circumference of the lid portion 51.

As shown in FIGS. 1 and 4, the ventilation plug 10 includes a ventilation film 11 made of a porous film or the like, and an annular plug body 15 that holds the ventilation film 11. The plug body 15 has an opening 16 covered with a ventilation film 11, a cylindrical outer cylinder portion (cylindrical portion) 17 surrounding the opening 16, and extending parallel to the outer cylinder portion 17 from the peripheral edge of the opening 16. It includes a cylindrical inner cylinder portion 18 that is taken out and surrounded by the outer cylinder portion 17. The outer cylinder portion 17 of the plug main body 15 has an outer diameter smaller than the diameter of the outer inner peripheral surface of the plug fixing recess 42 formed in the bottom 41 of the case 4, and also has an inner peripheral surface inside the plug fixing recess 42. Has an inner diameter larger than the diameter of. That is, the thickness of the outer cylinder portion 17 is smaller than the width (groove width) of the plug fixing recess 42. Further, the outer cylinder portion 17 has a shaft length smaller than the depth of the plug fixing recess 42. Further, the inner cylinder portion 18 of the plug main body 15 has an outer diameter smaller than the inner diameter of the communication recess 43 and equal to or larger than the diameter of the circumference inscribed in the plurality of ventilation holes 44, and is smaller than the depth of the communication recess 43. Has a shaft length. The opening 16 may be a circular hole or a square hole, and the outer cylinder portion 17 and the inner cylinder portion 18 may be formed in a square tubular shape.

Next, the procedure for assembling the electronic circuit device 1 configured as described above will be described.

When assembling the electronic circuit device 1, for example, a thermosetting (additional) silicone-based adhesive is applied to the surface of the connector fixing recess 48 extending along the notch 47 of the case 4 and the protruding portion 31 of the connector 3. After applying A, the connector 3 is arranged in the notch 47 while inserting the protrusion 31 into the connector fixing recess 48 of the notch 47 from above (while loosely fitting). Further, a part of the connector 3 is fastened to the bottom 41 of the case 4 with screws. Further, after applying the adhesive A to the surface of the plug fixing recess 42 formed in the bottom 41 of the case 4 and the outer cylinder portion 17 of the ventilation plug 10, the outer cylinder portion 17 is moved upward into the plug fixing recess 42. The inner cylinder portion 18 is loosely fitted into the communication recess 43, and the ventilation plug 10 is arranged on the bottom portion 41 of the case 4. Further, the adhesive A is applied to the upper surface of the boss portion formed on the bottom portion 41 of the case 4, and then the circuit board 2 is fastened to a part of the boss portions using screws or the like. After assembling the circuit board 2, the connector 3, the ventilation plug 10, and the like to the case 4, heat is applied to these members to cure the adhesive A.

As a result, the protruding portion 31 is fixed to the surface of the connector fixing recess 48 via the adhesive A, and the outer cylinder portion 17 is fixed to the surface of the plug fixing recess 42 via the adhesive A, whereby the connector 3 is fixed. And the ventilation plug 10 is fixed to the case 4 in a liquid-tight (water-tight) manner. Further, as shown in FIGS. 2 and 5, the ventilation plug 10 has a plurality of ventilation membranes 11 and openings 16 of the plug body 15 formed in the circuit board 2 and the bottom 41 when the case 4 and the like are viewed in a plan view. It is fixed to the bottom 41 so as not to overlap with the ventilation hole 44 of. Further, each ventilation hole 44 communicates with the opening 16 through a narrow space between the tip end portion of the inner cylinder portion 18 of the ventilation plug 10 and the bottom surface of the communication recess 43. The circuit board 2 and the connector 3 are electrically connected after the adhesive A is cured.

Subsequently, the adhesive A (used for adhering the connector 3 and the ventilation plug 10) is attached to the surface of the cover fixing recess 46 formed in the side wall portion 45 of the case 4 and the recess 32 of the connector 3 and the convex portion 53 of the cover 5. Apply the same one). Further, the cover 5 is placed on the side wall portion 45 of the case 4 while the convex portion 53 is inserted into the cover fixing recess 46 and the concave portion 32 of the connector 3 (while loosely fitting). Then, heat is applied while pressing the cover 5 against the case 4 to cure the adhesive A. When the adhesive A is cured, the convex portion 53 of the cover 5 is fixed to the surfaces of the cover fixing recess 46 and the recess 32 via the adhesive A, whereby the cover 5 is liquid-tightly fixed to the case 4 and electronically. The assembly of the circuit device 1 is completed. The inside of the case 4 and the cover 5 which are tightly joined via the adhesive A communicate with the outside through the ventilation film 11 of the ventilation plug 10. This makes it possible to adjust the pressure fluctuations in the case 4 and the cover 5 due to temperature changes and the like.

As described above, in the electronic circuit device 1, the outer cylinder portion 17 of the plug body 15 is inserted into the plug fixing recess (second recess) 42 formed in the bottom 41 of the case 4, and the plug fixing recess 42 is provided with the adhesive A. The ventilation plug 10 is fixed to the case 4 by adhering to the surface of the case 4. As a result, the ventilation plug 10 can be liquid-tightly fixed to the case 4 while reducing the cost by omitting the sealing member. Further, in the electronic circuit device 1, the opening directions of the plug fixing recess 42 for the ventilation plug 10 and the connector fixing recess 48 (first recess) for the connector 3 are aligned. As a result, the connector 3 and the ventilation plug 10 can be fixed to the case 4 in the same process, and the manufacturing cost of the electronic circuit device 1 can be reduced by simplifying the manufacturing equipment and shortening the manufacturing time. be able to.

Further, in the electronic circuit device 1, the opening directions of the cover fixing recess 46 (first recess) for the cover 5 and the recess 32 of the connector 3 are also aligned with the opening directions of the plug fixing recess 42 and the connector fixing recess 48. As a result, the cover 5 can be easily fixed to the case 4 and the manufacturing cost can be reduced. Further, the surfaces of the plug fixing recess 42, the cover fixing recess 46, the connector fixing recess 48, etc. are not required to be smooth, and it is not necessary to perform cutting on the cast case 4, so that the case 4 It is possible to reduce the processing cost. In addition, in the electronic circuit device 1, the plug fixing recess 42, the cover fixing recess 46, the connector fixing recess 48, and the like are sufficiently deeply secured, and each recess 42-48 is filled with the adhesive A. Even if the case 4 corrodes around the recesses 42-48, the waterproof performance can be maintained. As a result, in the electronic circuit device 1, it is possible to ensure good waterproof performance while suppressing cost increase.

Further, in the electronic circuit device 1, the plug main body 15 of the ventilation plug 10 includes an inner cylinder portion 18 extending from the peripheral edge of the opening 16 and surrounded by the outer cylinder portion 17. Further, the bottom portion 41 of the case 4 includes a communication recess 43 that communicates with the ventilation hole 44 and in which the inner cylinder portion 18 of the ventilation plug 10 is loosely fitted, and the ventilation hole 44 includes a communication recess 43 when the electronic circuit device 1 is viewed in a plan view. It is formed on the bottom 41 so as not to overlap the opening 16 of the plug body 15. As a result, it is possible to prevent the ventilation film 11 from being damaged by foreign matter or a tool that has passed through the ventilation hole 44 while communicating the inside and the outside of the case 4 via the ventilation film 11. Further, the ventilation plug 10 is fixed to the bottom 41 so that the ventilation film 11 does not overlap with the circuit board 2 when the electronic circuit device 1 is viewed in a plan view. As a result, it is possible to prevent the high humidity air from coming into direct contact with the circuit board 2.

In the electronic circuit device 1, the connector 3 including the protruding portion 31 is fixed to the connector fixing recess 48 extending along the notch 47 formed in the side wall portion 45 of the case 4 via the adhesive A. However, instead of the connector 3, as shown in FIG. 6, a connector 3B that does not include a protrusion may be adopted. In the electronic circuit device 1B shown in FIG. 6, a connector insertion port (opening) 49 having a shape matching the outer shape of the connector 3B is formed on the side wall portion 45B of the case 4B, and from the bottom portion 41B and the side wall portion 45B of the case 4B. The connector fixing recess is omitted. Then, the connector 3B is fitted to the connector insertion port 49 and fastened to the bottom 41 by a screw, and an O-ring or the like is formed between the outer peripheral surface of the connector 3B and the inner peripheral surface of the connector insertion port 49. Seal member 90 is arranged. Further, in the electronic circuit device 1B, the side wall portion 45 and the cover fixing recess 46 of the case 4B are formed over the entire outer circumference of the bottom portion 41, and the recess for fixing the cover 5 from the connector 3B is omitted.

As described above, the electronic circuit device of the present disclosure includes a case (4, 45B) including a bottom portion (41, 41B) and a side wall portion (45, 45B) extending along the outer periphery of the bottom portion (41, 41B). 4B), a circuit board (2) arranged in the case (4, 4B), a connector (3, 3B) connected to the circuit board (2), and a cover covering the circuit board (2). In the electronic circuit device (1,1B) including the (5) and the ventilation plug (10) fixed to the case (4,4B), the ventilation plug (10) is the ventilation film (11) and the said. The case (4,4B) includes an opening (16) covered by a ventilation film (11) and a plug body (15) having a tubular portion (17) surrounding the opening (16). A first recess (46,48) into which a part (31,53) of a member (3,5) that opens to the cover (5) side and is fixed to the case (4,4B) is inserted, and the cover (5). An annular second recess (42) formed in the bottom portion (41, 41B) so as to open on the) side and into which the tubular portion (17) of the ventilation plug (10) is inserted, and the second recess. The part (31) of a member (3,5) that includes at least one vent (44) that penetrates the bottom (41, 41B) inside the (42) and is secured to the case (4,4B). , 53) are fixed to the surface of the first recess (46, 48) via an adhesive (A), and the tubular portion (17) of the ventilation plug (10) is formed by the second recess (42). ) Is fixed to the surface of the surface via the adhesive (A).

In the electronic circuit device of the present disclosure, the ventilation plug is fixed to the case by inserting the tubular portion of the plug body into the second recess formed at the bottom of the case and adhering it to the surface of the second recess with an adhesive. .. As a result, the ventilation plug can be liquid-tightly fixed to the case while reducing the cost by omitting the sealing member. Further, by aligning the opening directions of the first and second recesses, the ventilation plug and other members fixed to the case can be easily fixed to the case, and the manufacturing cost can be reduced. Further, since the surfaces of the first and second recesses are not required to have smoothness, it is possible to reduce the processing cost of the case. As a result, in the electronic circuit device of the present disclosure, it is possible to ensure good waterproof performance while suppressing cost increase.

Further, the member fixed to the case (4) may include the connector (3), and the connector (3) is inserted into the first recess (48) and is inserted through the adhesive (A). It may include a protrusion (31) fixed to the surface of the first recess (48). As a result, the connector and the ventilation plug can be fixed to the case in the same process, so that the manufacturing cost can be reduced by simplifying the manufacturing equipment and shortening the manufacturing time.

Further, the member fixed to the case (4) may include the cover (5), and the cover (5) includes a convex portion (53) protruding toward the case (4). A notch (47) in which the connector (3) is arranged may be formed in the side wall portion (45) of the case (4), and the protruding portion (3) of the connector (3) may be formed. The 31) may project from both side surfaces of the connector (3) and the surface on the case (4) side, and the first recess extends along the notch (47) of the case (4). A cover in which the connector fixing recess (48) is recessed from the upper end surface of the side wall portion (45) of the case (4) toward the bottom portion (41) and the convex portion (53) of the cover (5) is inserted. A fixed recess (46) may be included, and a recess (32) into which the convex portion (53) of the cover (5) is inserted is formed on the surface of the connector (3) on the cover (5) side. You may. By aligning the fixing directions of the ventilation plug, the connector, and the cover with respect to the case in this way, it is possible to further reduce the manufacturing cost of the electronic circuit device.

Further, the member fixed to the case may include the cover (5), and the cover (5) may include a convex portion (53) protruding toward the case (4). The connector (3B) may be fitted into a connector insertion port (49) formed in the side wall portion (45B) of the case (4B), and the connector (3B) and the connector insertion port may be fitted. A sealing member (90) may be arranged between the inner peripheral surface of the case (49), and the first recess is formed from the upper end surface of the side wall portion (45B) of the case (4B) to the bottom side. The cover fixing recess (46) into which the convex portion (53) of the cover (5) is inserted may be included.

Further, the plug body (15) of the ventilation plug (10) includes an inner tubular portion (18) extending from the peripheral edge of the opening (16) and surrounded by the tubular portion (17). The bottom portion (41, 41B) of the case (4, 4B) communicates with the ventilation hole (44), and the inner cylinder portion (18) of the ventilation plug (10) is loosely fitted. The communication recess (43) may be included, and the ventilation hole (44) overlaps with the opening (16) of the plug body (15) when the electronic circuit device (1,1B) is viewed in a plan view. It may be formed on the bottom portion (41, 41B) so as not to become. As a result, it is possible to prevent the ventilation film from being damaged by foreign matter, tools, etc., while communicating the inside and the outside of the case via the ventilation film.

Further, the case (4, 4B) may be a cast product in which the surfaces of the first and second recesses (42, 46, 48) are not cut.

It goes without saying that the invention of the present disclosure is not limited to the above-described embodiment, and various changes can be made within the scope of the extension of the present disclosure. Further, the form for carrying out the above invention is merely a specific form of the invention described in the column of means for solving the problem, and is described in the column of means for solving the problem. It does not limit the elements of the invention.

The invention of the present disclosure can be used in the manufacturing industry of electronic circuit devices and the like.

1,1B electronic circuit equipment, 2 circuit boards, 21 boards, 22 electronic components, 3,3B connectors, 31 protrusions, 32 recesses, 4,4B cases, 41 bottoms, 42 plug fixing recesses, 43 communication recesses, 44 vents , 45, 45B Side wall, 46 cover fixing recess, 47 notch, 48 connector fixing recess, 49 connector outlet, 5 cover, 51 lid, 52 cover side wall, 53 convex, 10 ventilation plug, 11 ventilation film, 15 Plug body, 16 openings, 17 outer cylinders, 18 inner cylinders, 90 seal members, A adhesive.

Claims (6)

A case including a bottom portion and a side wall portion extending along the outer periphery of the bottom portion, a circuit board arranged in the case, a connector connected to the circuit board, a cover covering the circuit board, and the like. In electronic circuit devices, including vent plugs fixed to the case
The ventilation plug includes a ventilation membrane and a plug body having an opening covered by the ventilation membrane and a tubular portion surrounding the opening.
The case has a first recess that opens to the cover side and a part of a member fixed to the case is inserted, and a tubular shape of the ventilation plug that is formed in the bottom portion so as to open to the cover side. Includes an annular second recess into which the portion is inserted and at least one vent that penetrates the bottom inside the second recess.
The part of the member fixed to the case is fixed to the surface of the first recess via an adhesive, and the tubular portion of the ventilation plug is fixed to the surface of the second recess via an adhesive. Electronic circuit equipment to be. In the electronic circuit apparatus according to claim 1,
The member fixed to the case includes the connector.
The connector is an electronic circuit device including a protrusion that is inserted into the first recess and fixed to the surface of the first recess via an adhesive. In the electronic circuit apparatus according to claim 2,
The member fixed to the case further includes the cover.
The cover includes a protrusion that projects toward the case.
A notch in which the connector is arranged is formed in the side wall portion of the case.
The protrusions of the connector project from the side surfaces on both sides of the connector and the surface on the case side.
The first recess is a connector fixing recess extending along the notch in the case, and a cover fixing recess in which the convex portion of the cover is inserted while being recessed from the upper end surface of the side wall portion of the case to the bottom side. An electronic circuit device in which a concave portion into which the convex portion of the cover is inserted is formed on the surface of the connector on the cover side. In the electronic circuit apparatus according to claim 1,
The member fixed to the case includes the cover.
The cover includes a protrusion that projects toward the case.
The connector is fitted into a connector insertion port formed on the side wall portion of the case, and a sealing member is arranged between the connector and the inner peripheral surface of the connector insertion port.
The first concave portion is an electronic circuit device including a cover fixing concave portion that is recessed from the upper end surface of the side wall portion of the case to the bottom side and into which the convex portion of the cover is inserted. In the electronic circuit device according to any one of claims 1 to 4.
The plug body of the vent plug comprises an inner tubular portion that extends from the periphery of the opening and is surrounded by the tubular portion.
The bottom portion of the case includes a communication recess that communicates with the ventilation hole and in which the inner cylinder portion of the ventilation plug is loosely fitted.
The vent hole is an electronic circuit device formed at the bottom thereof so as not to overlap the opening of the plug body when the electronic circuit device is viewed in a plan view. In the electronic circuit device according to any one of claims 1 to 5.
The case is an electronic circuit device which is a cast product in which the surfaces of the first and second recesses are not machined.

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