CN211702531U - Electrical device - Google Patents

Abstract

An electrical device having: a housing; a bracket disposed outside the housing; a circuit board disposed inside the housing and having a ground terminal; a fastening member having a nut portion fastened to the circuit board and electrically connected to the ground terminal, a bolt portion protruding from the housing and fastened to the bracket in a penetrating state, an electrically conductive portion protruding from the housing and electrically connected to the bracket in a contact state at a peripheral edge of the bolt portion, and a sealing seat surface exposed from the housing at a peripheral edge of the electrically conductive portion; and a seal member mounted between the seal seat face and the bracket so as to cover a peripheral edge of the seal seat face.

Description

Electrical device

Technical Field

The utility model relates to an electric device of circuit substrate with ground connection.

Background

Conventionally, as such an electric device, for example, a device described in japanese patent application laid-open No. 2014-107092 is known. The electric device includes a circuit board having an insulating layer on a surface thereof as a conductor, and a conductive magnet (hereinafter referred to as a "grounding member") which is grounded. The grounding member is attracted to the circuit board by magnetic force, and the circuit board is grounded by a protrusion provided on the grounding member penetrating the insulating layer.

However, in jp 2014-107092 a, since only the insulating layer separates the circuit board and the ground member, there is a possibility that the waterproof property of the circuit board is impaired in an environment where the ground member is wet with water, for example.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can not harm the electric device that makes circuit substrate ground connection waterproof nature ground.

The electric device for achieving the above object comprises: a housing; a grounding member disposed outside the housing; a circuit board which is disposed inside the housing and has a ground terminal; a fastening member having a first fastening portion fastened to the circuit board and electrically connected to the ground terminal, a second fastening portion protruding from the housing and fastened to the ground member in a penetrating state, an electrically conductive portion protruding from the housing and electrically connected to the ground member in a contact state at a peripheral edge of the second fastening portion, and a sealing seat surface exposed from the housing at a peripheral edge of the electrically conductive portion; and a seal member mounted between the seal seat surface and the ground member so as to cover a peripheral edge of the seal seat surface.

According to this configuration, the ground terminal of the circuit board is electrically connected to the ground member via the first fastening portion of the fastening member and the conductive portion, and can be grounded. In this case, the second fastening portion and the conduction portion protrude from the housing, but the peripheral edge of the seal seat surface is covered with the seal member attached between the seal seat surface and the ground member. Therefore, the seal can suppress water leakage from the boundary position between the seal seat surface and the housing to the inside of the housing. Further, even in an environment in which the ground member is wet with water, the deterioration of the waterproof property of the circuit board can be suppressed.

In the above-described electric device, it is preferable that the first fastening portion and the second fastening portion are disposed coaxially with each other.

According to this structure, the fastening member can be made stronger by arranging the first fastening portion and the second fastening portion coaxially with each other than in the case of an offset arrangement, for example.

In the above electric device, it is preferable that the fastening member is integrated with the housing.

According to this configuration, the number of components can be reduced by integrating the fastening member with the housing. Further, the fastening member is integrated with the housing substantially without a gap between the fastening member and the housing, and thus water leakage into the housing can be further suppressed.

In the above electric device, it is preferable that the seal seat surface is connected to the housing so as to be positioned on the same plane.

According to this configuration, the seal seat surface is connected to the housing so as to be positioned on the same plane, and a step is not generated at a boundary position between the seal seat surface and the housing, so that water leakage from the boundary position to the inside of the housing through the seal can be suppressed more stably.

Effect of the utility model

The utility model discloses have the effect that can not harm waterproof nature ground messenger circuit substrate ground connection.

Drawings

Fig. 1 is an exploded perspective view showing a configuration of a first embodiment of an electric apparatus.

Fig. 2 is a sectional view showing the structure of the electric device according to this embodiment.

Fig. 3 is an enlarged view of fig. 2.

Fig. 4 (a) is a perspective view showing the structure of a fastening member of the electric device according to the embodiment.

Fig. 4 (b) is a perspective view showing the structure of the fastening member of the electric device according to the embodiment.

Fig. 5 is a sectional view showing a configuration of a second embodiment of an electric device.

Fig. 6 is a perspective view showing a structure of a fastening member of the electric device according to the embodiment.

Description of the symbols

1 … sensor device (electric device), 2,102 … case, 3,103 … fastening member, 4,104 … circuit board, 5,105 … bracket (grounding member), 6,106 … seal, 31 … nut portion (first fastening portion), 32 … bolt portion (second fastening portion), 33,133 … conduction portion, 35,135 … seal seat surface, 42,142 … grounding terminal, 131 … first bolt portion (first fastening portion), 132 … second bolt portion (second fastening portion).

Detailed Description

(first embodiment)

A first embodiment of the electric apparatus will be explained below.

As shown in fig. 1 and 2, a sensor device 1 as an electrical device includes a housing 2, a fastening member 3, a circuit board 4, and a holder 5 as a grounding member.

The case 2 has a bottomed substantially rectangular tubular case 21 made of, for example, a resin material, and a substantially rectangular plate-like lid 22 made of, for example, a resin material, and outer peripheral edges of the case 21 and the lid 22 are heat-welded substantially over the entire periphery thereof to form a sealed internal space

The fastening member 3 is made of a conductive metal material such as an iron material, for example, and the fastening member 3 is insert-molded into the cover 22. As shown in fig. 3 and (a) and (b) of fig. 4, the fastening member 3 integrally includes: a substantially cylindrical nut portion 31 as a first fastening portion; a substantially cylindrical bolt portion 32 as a second fastening portion, the bolt portion 32 having a center line O2 offset in parallel with a center line O1 of the nut portion 31; a substantially disk-shaped conduction part 33, the conduction part 33 being expanded in diameter compared with the bolt part 32 and connected to the base end of the bolt part 32; and a coupling portion 34.

The coupling portion 34 is connected to the base end of the conduction portion 33, and the coupling portion 34 extends in a direction orthogonal to the center lines O1, O2. The width of the coupling portion 34 is set to be the same as the diameter of the nut portion 31, and one distal end portion of the coupling portion 34 close to the nut portion 31 is connected to the proximal end portion of the nut portion 31 so as to be substantially flush with each other. The other distal end portion of the coupling portion 34, which is apart from the nut portion 31, has the same diameter as the nut portion 31, and is formed in a substantially semicircular plate shape larger than the diameter of the conduction portion 33. Therefore, the connection portion 34 is expanded to the outer peripheral side of the conduction portion 33 more than the conduction portion 33.

In the fastening member 3, a seal seat surface 35 is formed by substantially rounded rectangular flat surfaces of the nut portion 31 and the coupling portion 34 facing the bracket 5. The fastening member 3 is exposed from the housing 2 at the seal seating surface 35. Next, the fastening member 3 protrudes from the cover 22 in order at the conduction portion 33 and the bolt portion 32.

Further, the housing 2 is formed with a recess 23 so as to surround the seal seat surface 35. That is, the seal seat surface 35 is exposed from the housing 2 in the recess 23. The bottom surface 23a of the recess 23 is connected to the seal seat surface 35 so as to be positioned on the same plane. The amount of depression of the concave portion 23 is set to be the same as the length of protrusion of the conduction portion 33 from the connection portion 34.

As shown in fig. 1 and 2, the circuit board 4 is disposed inside the housing 2, and the circuit board 4 is fastened to the housing 2 by a plurality of bolts 71. The circuit board 4 is fastened by the fastening member 3. That is, as shown in fig. 3, the circuit board 4 is formed with a substantially circular bolt insertion hole 41 concentric with the nut portion 31. The circuit board 4 is fastened to the nut portion 31 by fastening the screw portion of the bolt 72 inserted into the bolt insertion hole 41 with a gap after insertion to the nut portion 31. In the circuit board 4, a substantially annular ground terminal 42 is formed at a peripheral edge portion of the bolt insertion hole 41 facing the nut portion 31. Therefore, the nut portion 31 is fastened to the circuit board 4 to be electrically connected to the ground terminal 42.

As shown in fig. 1 and 2, the holder 5 is made of a conductive metal plate such as an iron plate, and is disposed outside the housing 2 so as to face the cover 22. In addition, the bracket 5 is fastened to the case 2 by a plurality of bolts 73. In addition, the bracket 5 is fastened by the fastening member 3. That is, as shown in fig. 3, the bracket 5 is formed with a substantially circular bolt insertion hole 51 concentric with the bolt portion 32. The inner diameter of the bolt insertion hole 51 is set to be equal to the peak diameter of the bolt portion 32. The bracket 5 is fastened to the bolt portion 32 by fastening the nut 74 to the screw portion of the bolt portion 32 penetrating the bolt insertion hole 51. At this time, the holder 5 abuts against the case 2 at the peripheral edge of the recess 23 and abuts against and is electrically connected to the conduction portion 33.

The support 5 is connected to a reference potential point such as the ground, directly or indirectly, and grounded. Therefore, the ground terminal 42 of the circuit board 4 is grounded via the fastening member 3 and the bracket 5.

A seal 6 made of a resin material such as silicone, modified silicone, or urethane is attached between the fastening member 3 and the bracket 5 in cooperation with the seal seat surface 35. The seal 6 extends over the entire periphery of the boundary position including the boundary position of the housing 2 and the seal seat surface 35. In this way, for example, even if separation occurs at the boundary position, that is, separation between the metal material and the resin material, due to insert molding of the fastening member 3, water penetration into the case 2 from the boundary position can be suppressed. Further, the seal 6 can suppress the penetration of water into the case 2 from the fastening portion with the bolt 72 by closing the nut portion 31.

The operation and effect of the present embodiment will be described.

(1) In the present embodiment, the ground terminal 42 of the circuit board 4 is grounded by being conducted to the holder 5 through the nut portion 31 and the conducting portion 33 of the fastening member 3. At this time, the bolt portion 32 and the conduction portion 33 around the bolt portion 32 protrude from the case 2, but the seal seat surface 35 around the conduction portion 33 is covered with the seal 6 between the seal surface and the bracket 5. Therefore, the seal 6 can suppress water leakage from the boundary position between the seal seat surface 35 and the housing 2 to the inside of the housing 2. In addition, even in an environment in which the holder 5 is wet with water, the deterioration of the waterproof property of the circuit board 4 can be suppressed.

In particular, even if the aforementioned boundary position with the housing 2 is peeled off as the fastening member 3 is insert-molded, the seal 6 can suppress water from penetrating into the housing 2 from the boundary position.

(2) In the present embodiment, since the fastening member 3 is integrated with the housing 2 by insert molding, the number of components can be reduced. Further, the fastening member 3 is integrated with the case 2 without substantially generating a gap between the fastening member and the case 2, and thus water penetration into the case 2 can be further suppressed.

(3) In the present embodiment, the nut portion 31 is more firmly abutted with the ground terminal 4 as the bolt 72 is tightened. Therefore, as the nut portion 31 is fastened to the circuit board 4, the nut portion 31 and the ground terminal 42 can be more reliably electrically connected. Also, as the nut 74 is fastened to the bolt portion 32, the conduction portion 33 is more firmly abutted with the bracket 5. Therefore, as the bolt portion 32 and the bracket 5 are fastened, conduction between the bolt portion 32 and the bracket 5 can be more reliably achieved.

(4) In the present embodiment, since the projections such as the wire harness for connecting and grounding the circuit board 4 and the bracket 5 are not exposed from the housing 2, the sensor device 1 can be prevented from being caught when mounted on a mounting object (for example, a vehicle) and the operability can be improved.

(5) In the present embodiment, since there is no wire harness for connecting the circuit board 4 and the bracket 5 and grounding them, it is possible to suppress galvanic corrosion such as that occurring at the contact surface between the terminal of the wire harness and the bracket 5 even if the wire harness is wet with water, for example.

(6) In the present embodiment, since there is no wire harness for connecting and grounding the circuit board 4 and the holder 5, the circuit board 4 can be grounded by assembling the housing 2 having the circuit board 4 built therein, which is a component of the sensor device 1, and the holder 5. Therefore, the number of components and the number of assembly steps can be reduced, and the cost can be reduced.

(7) In the present embodiment, the operation of, for example, a sensor circuit, a control circuit, and the like mounted on the circuit board 4 can be further stabilized by grounding the ground terminal 42 of the circuit board 4 via the fastening member 3 and the holder 5.

(8) In the present embodiment, since the nut portion 31 of the insert-molded fastening member 3 has a cylindrical through shape, the manufacturing thereof can be further simplified, and the cost can be reduced.

(9) In the present embodiment, the nut portion 31 and the bolt portion 32 are arranged such that the center lines O1 and O2 are offset from each other. In this way, since the nut portion 31 fastened to the circuit board 4 and the bolt portion 32 fastened to the bracket 5 can be made non-coaxial with each other, the degree of freedom of arrangement thereof can be further improved.

(second embodiment)

A second embodiment of the electric apparatus will be explained below. In the second embodiment, the configuration of the fastening member of the first embodiment is mainly changed, and therefore, detailed description of the same parts will be omitted. In the configuration of the second embodiment, the same functions as those of the first embodiment are provided in the tens and the following tens of the reference numerals.

As shown in fig. 5 and 6, a fastening member 103 is insert-molded in the cover 122 of the housing 102. The fastening member 103 integrally has: a first bolt portion 131 as a first fastening portion, a second bolt portion 132 as a second fastening portion disposed concentrically with the first bolt portion 131, and a substantially disk-shaped conduction portion 133, wherein the conduction portion 133 is expanded in diameter compared with the second bolt portion 132 and is connected to a base end of the second bolt portion 132. The first bolt portion 131 has a substantially cylindrical stepped shape, and includes a substantially cylindrical bolt portion 131a and a substantially cylindrical large diameter portion 131b that is larger in diameter than the bolt portion 131a and is connected to a base end of the bolt portion 131 a. The large diameter portion 131b is set to have a diameter larger than that of the conduction portion 133, and the large diameter portion 131b is connected to the base end of the conduction portion 133. Therefore, the large diameter portion 131b is expanded to the outer peripheral side of the conduction portion 133.

As shown in fig. 5, in the fastening member 103, the seal seat surface 135 is formed by a substantially annular flat surface of the large diameter portion 131b facing the holder 5. The fastening member 103 is exposed from the housing 102 at the seal seat face 135. Next, the fastening member 103 protrudes from the cover 122 in order at the conduction portion 133 and the second bolt portion 132.

Further, the housing 102 is formed with a recess 123 so as to surround the seal seat surface 135. That is, the seal seat surface 135 is exposed from the housing 102 in the recess 123. The bottom surface 123a of the recess 123 is located on the same plane as the seal seat surface 135. The recess amount of the recess 123 is set to be the same as the length of the conduction portion 133 protruding from the large diameter portion 131 b.

The circuit board 104 is fastened to the first bolt portion 131 by fastening the nut 76 to the screw portion of the bolt portion 131a penetrating the bolt insertion hole 141. At this time, the first bolt portion 131 is brought into contact with the ground terminal 142 at the large diameter portion 131b to be conducted.

The bracket 5 is fastened to the second bolt portion 132 by fastening the nut 77 to the screw portion of the second bolt portion 132 penetrating the bolt insertion hole 51. At this time, the holder 5 abuts against the case 102 at the peripheral edge of the recess 123, and the holder 5 abuts against and is electrically connected to the conduction portion 133.

As a result, the ground terminal 142 of the circuit board 104 is grounded via the fastening member 103 and the bracket 5.

A substantially annular seal 106 is fitted between the fastening member 103 and the bracket 5 in cooperation with the seal seat surface 135. The seal 106 extends over the entire circumference of the boundary position between the housing 102 and the seal seat surface 135.

As described above in detail, according to the present embodiment, in addition to the effects of (1) to (7) in the above-described first embodiment, the following effects can be obtained.

(1) In the present embodiment, the fastening member 103 can be made stronger by disposing the first bolt portion 131 and the second bolt portion 132 coaxially with each other than in the case of the offset disposition, for example.

This embodiment can be modified and implemented as follows. The present embodiment and the following modifications can be combined and implemented within a range not technically contradictory to the technology.

In the first embodiment, the nut portion 31 may be a substantially cylindrical shape having a bottom. In this case, the nut portion 31 itself is closed so as not to leak water into the case 2 from the fastening portion with the bolt 72, and therefore the seal 6 can be saved accordingly.

In the first embodiment, if the bolt 72 has conductivity, the ground terminal 42 may be formed on the peripheral edge portion of the bolt insertion hole 41 so as to face the head portion of the bolt 72. In this case, the nut portion 31 is electrically connected to the ground terminal 42 via the bolt 72.

In the first embodiment, the nut portion 31 and the bolt portion 32 may be arranged such that the center lines O1 and O2 are not parallel to each other.

In the second embodiment, if the nut 76 has conductivity, the ground terminal 142 may be formed on the peripheral edge of the bolt insertion hole 141 so as to face the nut 76. In this case, the first bolt unit 131 is electrically connected to the ground terminal 142 via the nut 76.

In the above embodiments, the seal seat surfaces 35,135 may not be connected to the bottom surfaces 23a,123a of the concave portions 23,123 and may be positioned on the same plane.

In the above embodiments, the concave portions 23,123 may not be formed in the housings 2, 102. That is, the seal seating surface 35,135 may be directly exposed on the surface of the housing 2, 102. In this case, the seal seat surfaces 35,135 may be connected to the surface of the housing 2,102 and may be positioned on the same plane or not.

In the above embodiments, the fastening members 3,103 may be integrated with the housings 2,102 without insert molding. That is, the fastening member 3,103 can be attached to the housing 2,102 provided separately in a fixed state.

The present invention can be applied to appropriate electric devices other than the sensor device 1, such as a display device and an input/output device.

Technical ideas that can be grasped from the above-described embodiments and modifications are described.

(1) In the above-mentioned electric device, the electric device,

the first fastening portion and the second fastening portion are arranged with centerlines offset from each other.

According to this configuration, since the first fastening portion fastened to the circuit board and the second fastening portion fastened to the ground member can be made non-coaxial with each other, the degree of freedom of arrangement thereof can be further improved.

Claims (5)

1. An electrical device, comprising:

a housing;

a grounding member disposed outside the housing;

a circuit board which is disposed inside the housing and has a ground terminal;

a fastening member having a first fastening portion fastened to the circuit board and electrically connected to the ground terminal, a second fastening portion protruding from the housing and fastened to the ground member in a penetrating state, an electrically conductive portion protruding from the housing and electrically connected to the ground member in a contact state at a peripheral edge of the second fastening portion, and a sealing seat surface exposed from the housing at a peripheral edge of the electrically conductive portion; and

and a seal member mounted between the seal seat surface and the ground member so as to cover a peripheral edge of the seal seat surface.

2. The electrical device of claim 1,

the first fastening portion and the second fastening portion are configured to be coaxial with each other.

3. The electrical device of claim 1,

the fastening member is integrated with the housing.

4. The electrical device of claim 2,

the fastening member is integrated with the housing.

5. Electrical device according to any one of claims 1 to 4,

the sealing seat surface is connected with the shell to be positioned on the same surface.

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