JP2017117893A - Electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic device which secures waterproofness over a long period in a structure having a gap between an end surface of an opening part in an enclosure and a side wall part of a housing.SOLUTION: In an electronic device, a circuit board 20 and part of a connector 30 are housed in an internal space of an enclosure 60 formed by assembling a case 64 to a cover 66, the internal space is made into a waterproof space by a seal material 90, and a part of the connector 30 is exposed to the exterior part from an opening 62 of the enclosure 60. A housing 34 of the connector has: a fitting part 40 which fits in the exterior part; a side wall part 44 which is provided between a seal surface 42a and the fitting part so as to face an end surface 62b of the opening and form a gap with the end surface; and a groove part 52 which is provided between the seal surface and the side wall part so as to be recessed relative to the seal surface.SELECTED DRAWING: Figure 3

Description

  In this specification, a circuit board and a part of a connector are accommodated in an internal space of a casing formed by assembling a case and a cover, and the internal space is made a waterproof space by a sealing material. The present invention relates to an electronic device exposed to the outside from an opening of a housing.

  As disclosed in Patent Document 1, a circuit board and a part of a connector are accommodated in an internal space of a casing formed by assembling a case and a cover, and the internal space is made a waterproof space by a sealing material. There is known an electronic device in which a part is exposed to the outside from an opening of a housing.

  In this electronic device, a case is disposed on one surface side of the circuit board, and a cover is disposed on the back surface side opposite to the one surface. The housing is formed using a metal material such as aluminum or iron. The sealing material is interposed between the facing surfaces of the case and the cover, and between the inner surface of the peripheral edge of the opening in the housing and the sealing surface of the housing facing the inner surface.

JP 2001-85858 A

  There is a demand for miniaturization of electronic devices. Of the connectors, the shape and dimensions of the fitting portion of the housing are determined in relation to the outside (the mating connector). For this reason, size reduction is achieved in the connector on the seal side with respect to the housing. When the circuit board is downsized in the plate thickness direction, the sealing surface of the housing is positioned closer to the circuit board than the outer surface of the fitting portion. In this case, the housing has a side wall portion at a position between the sealing surface and the fitting portion and away from the end surface of the opening so as to face the end surface of the opening in the housing.

  Moreover, when it has an above-described side wall part, the sealing material interposed between a housing | casing and a housing can be concealed and an appearance can be improved.

  However, if the structure has a side wall portion for miniaturization, appearance improvement, etc., a gap is formed between the end surface of the opening, that is, the seal portion between the housing and the connector via the sealing material, and the side wall portion. The Rukoto. Accordingly, a corrosive solution that corrodes the metal casing, such as seawater or a solution of calcium chloride used as a snow melting agent, is likely to enter the gap and stay. For this reason, there is a possibility that the corrosive liquid comes into contact with the interface of the casing with the sealing material, the corrosion proceeds, and sufficient waterproofness cannot be secured.

  The present disclosure has been made in view of such a problem, and in an arrangement having a gap between the end face of the opening in the housing and the side wall of the housing, the electronic device can ensure waterproofness for a long period of time. The purpose is to provide.

  The present disclosure employs the following technical means to achieve the above object. In addition, the code | symbol in parenthesis shows the corresponding relationship with the specific means as described in embodiment mentioned later as one aspect | mode, Comprising: The technical scope is not limited.

One of the present disclosure includes a circuit board (20) having one surface (20a) and a back surface (20b) opposite to the one surface in the thickness direction.
A connector (30) having a plurality of terminals (32) electrically connected to the circuit board and a housing (34) holding the plurality of terminals;
It has a case (64) disposed on the one surface side and a cover (66) disposed on the back surface side, and is connected to the connector via an opening (62) formed in a state where the case and the cover are assembled. A metal casing (60) that accommodates the remaining portion of the connector and the circuit board in the internal space while exposing a part of
Seals interposed between the facing surfaces of the case and the cover and between the inner surface (62a) of the peripheral edge of the opening in the housing and the sealing surface (42a) of the housing facing the inner surface, and the internal space as a waterproof space Material (90);
With
The housing is provided between the sealing surface and the fitting portion so that there is a gap between the fitting portion (40) with the outside and the end surface (62b) of the opening in the housing, facing the end surface. And a groove (52) provided between the sealing surface and the side wall so as to be recessed with respect to the sealing surface.

  According to this, even if a corrosive liquid such as salt water enters and stays in the gap between the end face of the housing and the side wall of the housing, the corrosive liquid is at the interface with the sealing material in the housing as much as the groove is provided. Difficult to touch. Therefore, in a configuration having a gap between the end face of the opening in the housing and the side wall of the housing, waterproofness can be ensured over a long period of time.

It is the top view which looked at the electronic device concerning a 1st embodiment from the case side. It is a side view of an electronic device. It is sectional drawing which follows the III-III line of FIG. It is the figure which expanded the area | region IV enclosed with the dashed-dotted line in FIG. It is a perspective view which shows a part of connector. In a reference example, it is a figure showing the state where the corrosive liquid stagnated. In 1st Embodiment, it is a figure which shows the state in which the corrosive liquid stagnated. In the electronic device which concerns on 2nd Embodiment, it is sectional drawing which expanded the groove part periphery, and respond | corresponds to FIG. In the electronic device which concerns on 3rd Embodiment, it is sectional drawing to which the groove part periphery was expanded, and respond | corresponds to FIG. In the electronic device which concerns on 4th Embodiment, it is sectional drawing which expanded the groove part periphery, and respond | corresponds to FIG. It is sectional drawing which shows the effect of a through-hole. In the electronic device which concerns on 5th Embodiment, it is sectional drawing which expanded the groove part periphery, and respond | corresponds to FIG.

  A plurality of embodiments will be described with reference to the drawings. In several embodiments, functionally and / or structurally corresponding parts are given the same reference numerals. The board thickness direction of the circuit board is the Z direction, one direction orthogonal to the Z direction, and the arrangement direction of the terminals is the X direction. A depth direction orthogonal to both the Z direction and the X direction is referred to as a Y direction. Unless otherwise specified, the shape along the XY plane is a planar shape.

(First embodiment)
First, the electronic apparatus according to the present embodiment will be described with reference to FIGS. In FIG. 5, the structure of the fitting part connected with an external apparatus is simplified and shown in the connector.

  As shown in FIGS. 1 to 3, the electronic device 10 includes a circuit board 20, a connector 30, a housing 60, and a sealing material 90. The electronic device 10 is configured as an ECU (Electric Control Unit) having a waterproof structure. The electronic device 10 is configured as a vehicle engine ECU, for example.

  The circuit board 20 includes a printed board and electronic components (not shown) mounted on the printed board. The printed circuit board has wirings arranged on a base material formed using an electrically insulating material such as a resin. A circuit is formed by the wiring and the electronic components. The circuit board 20 is accommodated in the internal space of the housing 60.

  The circuit board 20 has one surface 20a and a back surface 20b opposite to the one surface 20a in the Z direction. The circuit board 20 (printed board) has a substantially rectangular plane shape. The connector 30 is disposed on one end side in the Y direction with respect to the circuit board 20 and in the vicinity of the center in the X direction. As shown in FIG. 3, the connector 30 is mainly disposed on the one surface 20a side. The circuit board 20 is fixed to the housing 60 by a known fixing method such as screw fastening or adhesion.

  The connector 30 is mounted on the circuit board 20. A part of the connector 30 is exposed to the outside through the opening 62 of the housing 60, and the remaining part is accommodated in the internal space of the housing 60. The connector 30 is formed using a conductive material, and includes a plurality of terminals 32 that electrically relay a circuit configured on the circuit board 20 and an external device, and a housing 34 formed using a resin material. Have.

  The terminal 32 is held by the housing 34. The plurality of terminals 32 are arranged along the X direction. In the present embodiment, since the number of terminals is large, the terminals 32 are arranged in multiple stages in the Z direction. Further, the terminal 32 is inserted and mounted on the circuit board 20 as shown in FIG. However, a surface mount structure can also be employed.

  The housing 34 includes a cylindrical portion 36 that forms the outer surface of the connector 30, and a blocking wall 38 that is connected to the cylindrical portion 36 and holds a plurality of terminals 32. The cylindrical portion 36 is formed in a cylindrical shape with the Y direction as an axis. The blocking wall 38 closes the cylinder part 36 in the middle of the cylinder. The terminal 32 is held on the closing wall 38 by, for example, press-fitting and insert molding. The terminal 32 is substantially L-shaped, and a portion connected to an external device and a portion held by the blocking wall 38 extend in the Y direction. On the other hand, the portion connected to the circuit board 20 protrudes from the blocking wall 38 and is bent and extends in the Z direction.

  The cylinder part 36 has a fitting part 40, a seal part 42, a side wall part 44, and a connecting part 46. In FIG.3 and FIG.4, each boundary of the fitting part 40, the seal part 42, the side wall part 44, and the connection part 46 is shown with the broken line.

  The fitting portion 40 protrudes from the blocking wall 38 of the terminal 32 and protects the portion connected to the external device. The fitting part 40 is a part of the cylindrical part 36 on the side used for connection with an external device rather than the blocking wall 38 in the Y direction. The fitting part 40 contributes to fitting with an external device. On the outer surface of the fitting portion 40, a fitting projection 40a is formed.

  The seal portion 42, the side wall portion 44, and the connecting portion 46 are portions of the cylindrical portion 36 excluding the fitting portion 40. Among them, the seal portion 42 is a portion where the seal material 90 is interposed between the seal portion 42 and the housing 60. The seal portion 42 faces the inner surface 62 a of the periphery of the opening 62 in the housing 60. The outer surface of the seal portion 42 is a seal surface 42 a with which the seal material 90 comes into contact. The seal surface 42a has an annular shape corresponding to the periphery of the opening, specifically, the inner surface 62a. The seal surface 42a has a convex portion 48 that protrudes with respect to other portions of the seal surface 42a. The seal surface 42a has a recess 50 that is recessed with respect to other portions of the seal surface 42a. When the convex portion 48 and the concave portion 50 are combined, they are formed over the entire circumference of the cylinder, that is, the entire length of the annular seal surface 42a.

  The side wall portion 44 is provided between the seal portion 42 and the fitting portion 40 in the Y direction. The side wall portion 44 is provided to face the end surface 62b of the opening 62 so as to have a gap between the side surface portion 44 and the end surface 62b in the Y direction. Specifically, the side wall surface 44a of the side wall portion 44 faces the end surface 62b.

  The connecting portion 46 is a portion that connects the seal portion 42 and the side wall portion 44. The connecting portion 46 is formed with a groove 52 that is recessed with respect to the sealing surface 42a. The groove part 52 is recessed with respect to the part which continues in the Y direction among the sealing surfaces 42a. As shown in FIGS. 3 to 5, in the portion where the convex portion 48 is formed, the groove portion 52 is recessed with respect to a flat portion which is not the convex portion 48 in the seal surface 42 a. On the other hand, as shown in FIG. 3, in the portion where the recess 50 is formed, the groove 52 is recessed with respect to a flat portion that is not the recess 50 in the seal surface 42a. 3 and 4, as a reference line, the same position as the flat portion of the seal surface 42 a in the Z direction is indicated by a two-dot chain line above the bottom surface 52 a of the groove 52.

  The groove part 52 is formed in at least a part of the connecting part 46 in the Y direction. In this embodiment, the groove part 52 is formed in the whole connection part 46 in the Y direction. Further, the groove portion 52 is formed on the entire circumference of the tube of the connecting portion 46.

  As shown in FIG. 1, the housing 34 of the connector 30 has two fitting openings. A part of the two fitting ports is an engine block provided for connection with a wire harness for driving the engine, and the remaining fitting ports are provided for connection with a wire harness corresponding to the body ECU or the like. It is a body block. Note that the number of fitting openings of the connector 30 is not particularly limited.

  The housing 60 is formed using a metal material such as aluminum or iron. The housing 60 accommodates a part of the connector 30 and the circuit board 20 therein to protect them. The housing 60 includes two members divided in the Z direction, specifically, a case 64 and a cover 66 as shown in FIGS. 2 and 3. The case 60 is configured by assembling the case 64 and the cover 66 in the Z direction. The method for assembling the case 64 and the cover 66 is not particularly limited. For example, screw fastening can be employed.

  The case 64 has a box shape whose upper surface is open. The bottom surface of the case 64 has a substantially rectangular shape corresponding to the circuit board 20. One of the four side surfaces of the case 64 is formed with a side surface opening connected to the upper surface opening.

  The cover 66 forms an internal space of the housing 60 together with the case 64. The cover 66 is shaped like a shallow box with one surface opened so as to close the upper surface opening of the case 64. By assembling the case 64 and the cover 66, the upper surface opening of the case 64 is closed by the cover 66, and the opening 62 is formed.

  A recess 68 in which the sealing material 90 is disposed is formed on the inner surface of the peripheral portion of the case 64. The recess 68 is also formed on the inner surface 62 a at the periphery of the opening 62. The recess 68 is provided to be recessed with respect to the other part of the inner surface 62a. The concave portion 68 is provided corresponding to the convex portion 48 of the housing 34.

  A convex portion 70 is formed on the inner surface of the peripheral edge of the cover 66. The convex portion 70 is provided corresponding to the concave portion 68 at a portion facing the case 64. On the other hand, the convex portion 70 is provided corresponding to the concave portion 50 at a portion facing the housing 34. That is, the convex portion 70 is also formed on the inner surface 62 a of the peripheral edge of the opening 62.

  The sealing material 90 functions to prevent water from entering the internal space by sealing the internal space of the housing 60 in a watertight manner, for example, with respect to the engine room. That is, the sealing material 90 is for making the internal space of the housing 60 a waterproof space. The sealing material 90 is interposed between the facing surfaces of the case 64 and the cover 66, and between the inner surface 62 a of the peripheral edge of the opening 62 in the housing 60 and the sealing surface 42 a of the sealing portion 42 in the housing 34. Forming part. As the sealing material 90, for example, a silicon-based moisture-curing adhesive can be used.

  Next, effects of the electronic device 10 described above will be described with reference to FIGS. FIG. 6 shows a conventional configuration as a reference example. In FIG. 6, the reference numerals of the elements in the reference example are those obtained by adding 100 to the reference numerals of related elements in the present embodiment.

  Also in the conventional configuration illustrated in FIG. 6, a predetermined gap is formed between the end surface 162 b of the opening 162 in the housing 160 and the side wall surface 144 a of the side wall portion 144. On the other hand, no groove is formed in the connecting portion 146, and the outer surface of the connecting portion 146 is substantially flush with the flat portion of the seal surface 142 a of the seal portion 142. For this reason, there exists a possibility that the corrosive liquid 200, such as the solution by salt melting of calcium chloride used as a snow melting agent, salt water, etc. may enter into the said clearance gap and may stay.

  As shown in FIG. 6, when the corrosive liquid 200 is retained and the retained corrosive liquid 200 comes into contact with the inner surface 162 a of the housing 160 (the case 164 in FIG. 6), that is, the interface with the sealing material 190, the seal in the housing 160 is sealed. It is continuously generated that the interface with the material 190 corrodes to form a gap, and the staying corrosive liquid 200 enters the gap. As a result, the seal surface 142a and the inner surface 162a are finally peeled off, and the inside and the outside of the electronic device are connected. That is, the waterproof property is lost.

  On the other hand, in this embodiment, as shown in FIG. 7, the groove part 52 is formed in the connection part 46. As shown in FIG. The groove 52 is recessed with respect to the flat portion of the seal surface 42a. In FIG. 7, as a reference line, the same position as the flat portion of the seal surface 42 a in the Z direction is indicated by a two-dot chain line above the bottom surface 52 a of the groove 52. Therefore, even if the same amount of the corrosive liquid 200 as in FIG. 6 enters and stays in the gap, the corrosive liquid 200 does not contact the casing 60 (the case 64 in FIG. 7) by the amount of the groove 52. Specifically, the corrosive liquid 200 does not contact the interface portion with the sealing material 90 in the housing 60. Therefore, in the configuration having a gap between the end surface 62b of the opening 62 in the housing 60 and the side wall portion 44 of the housing 34, waterproofness can be ensured over a long period of time.

  In particular, in this embodiment, the groove part 52 is provided in the perimeter of the cylinder of the connection part 46. FIG. Therefore, the corrosive liquid 200 staying in the gap can be prevented from coming into contact with the interface with the sealing material 90 in the housing 60 regardless of the arrangement of the electronic device 10 in the vehicle. That is, the degree of freedom of arrangement of the electronic device 10 can be improved.

  However, if the attachment position to the vehicle is determined, the groove portion 52 may be provided only at a location where the corrosive liquid 200 may stay due to the positional relationship.

  In the present embodiment, the housing 34 has a side wall 44. Further, on the case 64 side, the seal surface 34 a of the housing 34 is located closer to the circuit board 20 than the outer surface of the fitting portion 40. Therefore, the size of the electronic device 10 can be reduced in the Z direction.

  Moreover, in this embodiment, since it has the side wall part 44, the sealing material 90 interposed between the housing | casing 60 and the housing 34 can be concealed, and an appearance can also be improved.

(Second Embodiment)
This embodiment can refer to the preceding embodiment. For this reason, the description about the part which is common in the electronic device 10 shown in the preceding embodiment is omitted.

  In the present embodiment, as shown in FIG. 8, the housing 60 is extended from a part of the end surface 62 b of the opening 62 toward the side wall 44 so as to face the bottom surface 52 a of the groove 52 in the Z direction. A collar 72 is provided.

  The flange 72 extends in the Y direction from a part of the end face 62b. The distal end of the flange portion 72 is not in contact with the side wall surface 44 a of the side wall portion 44 in consideration of assembly tolerances and the like. In the example shown in FIG. 8, the collar portion 72 extends from the end portion of the end surface 62b opposite to the bottom surface 52a in the Z direction. Like the groove portion 52, the flange portion 72 is also provided in an annular shape corresponding to the end surface 62 b of the opening 62.

  According to this, as indicated by solid line arrows in FIG. 8, high-pressure water such as high-pressure washing water is present at the interface between the housing 60 and the sealing material 90 and at the interface between the housing 34 (the sealing portion 42) and the sealing material 90. Direct hitting can be suppressed. That is, it can suppress that the sealing material 90 peels.

  In addition, the position of the collar part 72 is not limited to the example shown in FIG. For example, in FIG. 8, you may provide the collar part 72 so that the edge part by the side of the bottom face 52a may be included among the end surfaces 62b. Moreover, if the location where the high-pressure water hits is determined depending on the mounting position on the vehicle, the collar portion 72 may be provided only at the location where the high-pressure water hits.

(Third embodiment)
This embodiment can refer to the preceding embodiment. For this reason, the description about the part which is common in the electronic device 10 shown in the preceding embodiment is omitted.

  In the present embodiment, as shown in FIG. 9, the casing 60 hangs from the flange portion 72 toward the bottom surface 52a of the groove portion 52 so as to face the side wall surface 44a of the side wall portion 44 in the Y direction. A portion 74 is provided.

  The drooping portion 74 extends from a part of the flange portion 72 in the Z direction so as not to contact the bottom surface 52a. In the example illustrated in FIG. 9, the drooping portion 74 extends from the end portion on the side wall portion 44 side in the Y direction in the flange portion 72. The lower end of the drooping portion 74 is positioned closer to the bottom surface 52a than the interface between the housing 60 (case 64) and the sealing material 90 in the Z direction. Furthermore, the lower end of the drooping portion 74 is positioned closer to the bottom surface 52a than the interface between the housing 34 (the sealing portion 42) and the sealing material 90 in the Z direction. The drooping portion 74 is also provided in an annular shape corresponding to the end surface 62 b of the opening 62, similar to the collar portion 72.

  According to this, as shown by the solid line arrow in FIG. 9, the high-pressure water directly hits the interface between the housing 60 and the sealing material 90 and the interface between the housing 34 (the sealing portion 42) and the sealing material 90. It can suppress more effectively. That is, peeling of the sealing material 90 can be more effectively suppressed.

  In the present embodiment, the lower end of the drooping portion 74 is positioned closer to the bottom surface 52a than the interface between the sealing portion 42 and the sealing material 90, that is, the flat portion of the sealing surface 42a, in the Z direction. Thus, since the drooping portion 74 extends to a position closer to the bottom surface 52a than the interface between the housing 60 or the housing 34 and the sealing material 90, it is particularly effectively suppressed that the high-pressure water hits the interface. can do.

  The position of the drooping portion 74 is not limited to the example shown in FIG. For example, you may provide in the intermediate position of the Y direction in the collar part 72. FIG. Similarly to the collar portion 72, if the location where the high-pressure water hits is determined, the drooping portion 74 may be provided only at the location where the high-pressure water hits.

(Fourth embodiment)
This embodiment can refer to the preceding embodiment. For this reason, the description about the part which is common in the electronic device 10 shown in the preceding embodiment is omitted.

  In the present embodiment, as shown in FIG. 10, the housing 60 has a through hole 76 formed in the flange 72. The through holes 76 are formed in the annular flange 72 at a predetermined pitch along the circumferential direction of the cylindrical portion 36. In FIG. 10, the through hole 76 is formed adjacent to the end face 62b. That is, a through hole 76 is formed in the root portion of the collar portion 72.

  According to this, even if the hook portion 72 is positioned vertically downward and the corrosive liquid 200 enters the region surrounded by the hook portion 72 and the drooping portion 74, as shown in FIG. The corrosive liquid 200 can escape in the direction, that is, outside the electronic device 10. Therefore, the corrosive liquid 200 stays in a region surrounded by the flange portion 72 and the drooping portion 74, and the staying corrosive liquid 200 can be prevented from coming into contact with the housing 60.

  The through hole 76 is formed adjacent to the end face 62b. For this reason, even if the high-pressure water passes through the through-hole 76, the high-pressure water flows along the end face 62b as shown by solid arrows in FIG. Therefore, peeling of the sealing material 90 can be effectively suppressed while exhibiting the above effects.

  The position of the through hole 76 is not limited to the above example. What is necessary is just to form in the collar part 72 at least. Further, the present invention can also be applied to a configuration that does not have the drooping portion 74 but has only the collar portion 72.

(Fifth embodiment)
This embodiment can refer to the preceding embodiment. For this reason, the description about the part which is common in the electronic device 10 shown in the preceding embodiment is omitted.

  In the present embodiment, as shown in FIG. 12, the bottom surface 52a of the groove 52 is further away from the seal surface 42a in the Z direction as it approaches the side wall 44 in the Y direction from the seal surface 42a of the housing 34. Specifically, the bottom surface 52a is a tapered surface.

  According to this, even if the corrosive liquid 200 enters the gap and stays in the groove 52, the staying corrosive liquid 200 is biased toward the side wall 44 in the Y direction. Therefore, the staying corrosive liquid 200 can be prevented from coming into contact with the interface with the sealing material 90 in the housing 60.

  The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combination of elements shown in the embodiments. The disclosure can be implemented in various combinations. The technical scope disclosed is not limited to the description of the embodiments. The several technical scopes disclosed are indicated by the description of the claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the claims. .

  Although the example of engine ECU was shown as electronic device 10, it is not limited to this. Furthermore, the present invention is not limited to the electronic control device. The circuit board 20 and a part of the connector 30 are accommodated in the internal space of the housing 60 formed by assembling the case 64 and the cover 66, and the internal space is made a waterproof space by the sealing material 90, and a part of the connector 30 is Any electronic device 10 that is exposed to the outside from the opening 62 of the housing 60 may be used.

  Corresponding to the concave portion 68 of the case 64, a convex portion 48 is provided on the sealing surface 42 a of the sealing portion 42 in the housing 34, and the concave portion 50 is provided on the sealing surface 42 a of the sealing portion 42 corresponding to the convex portion 70 of the cover 66. The example provided is shown. However, the waterproof structure part of the housing 60 and the housing 34 via the sealing material 90 is not limited to the above example. For example, it is good also as a structure which does not have the convex part 48, the recessed part 50, the recessed part 68, and the convex part 70. FIG. Moreover, the housing 34 may have a convex portion provided over the entire circumference of the cylinder, and the housing may have a concave portion corresponding to the convex portion. Moreover, the housing 34 may have a concave portion provided over the entire circumference of the cylinder, and the housing may have a convex portion corresponding to the concave portion.

DESCRIPTION OF SYMBOLS 10 ... Electronic device, 20 ... Circuit board, 20a ... One side, 20b ... Back surface, 30 ... Connector, 32 ... Terminal, 34 ... Housing, 36 ... Tube part, 38 ... Closure part, 40 ... Fitting part, 42 ... Seal part 42a ... Sealing surface 44 ... Side wall portion 44a ... Side wall surface 46 ... Linking portion 48 ... Convex portion 50 ... Concavity portion 52 ... Groove portion 52a ... Bottom surface 60 ... Housing 62 ... Opening portion 62a ... Inner surface, 62b ... end face, 64 ... case, 66 ... cover, 68 ... concave part, 70 ... convex part, 72 ... collar part, 74 ... drooping part, 76 ... through hole, 90 ... sealing material, 200 ... corrosive liquid

Claims (8)

A circuit board (20) having one surface (20a) and a back surface (20b) opposite to the one surface in the thickness direction;
A connector (30) having a plurality of terminals (32) electrically connected to the circuit board and a housing (34) holding the plurality of terminals;
An opening (62) formed in a state in which the case and the cover are assembled, the case (64) disposed on the one surface side and a cover (66) disposed on the back surface side; A metal housing (60) for housing the remaining portion of the connector and the circuit board in an internal space while exposing a part of the connector to the outside,
The internal space is interposed between the facing surfaces of the case and the cover, and between the inner surface (62a) of the periphery of the opening in the housing and the sealing surface (42a) of the housing facing the inner surface. A sealing material (90) which is a waterproof space;
With
The housing is fitted with the seal surface so that there is a gap between the fitting portion (40) with the outside and the end surface (62b) of the opening in the housing, facing the end surface. An electronic device comprising: a side wall (44) provided between the sealing surface and a groove (52) provided between the sealing surface and the side wall so as to be recessed with respect to the sealing surface.   The electronic device according to claim 1, wherein the groove portion is provided on the entire circumference around the housing corresponding to the end face of the opening.   The said housing | casing extends toward the said side wall part from a part of said end surface, and has the collar part (72) facing the bottom face (52a) of the said groove part in the said plate | board thickness direction. Electronic equipment.   4. The electronic device according to claim 3, wherein the housing includes a hanging portion (74) extending from the flange portion toward the bottom surface and facing the side wall portion.   The electronic device according to claim 4, wherein the drooping portion extends to a position closer to the bottom surface than the seal surface in the plate thickness direction.   The electronic device according to any one of claims 3 to 5, wherein the housing includes a through hole (76) formed in the flange portion.   The electronic device according to claim 6, wherein the through hole is formed adjacent to the end face.   The electronic device according to claim 1, wherein the bottom surface of the groove portion is further away from the seal surface in the plate thickness direction as it approaches the side wall portion from the seal surface.

Images