JP2013206969A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus which prevents dust from intruding into areas located at the electronic component mounting side and around a connector terminal in a housing and prevents electric failures such as short circuits from being caused.SOLUTION: An electronic control device 1 includes: a circuit board 20 on which an electronic component 21 is mounted; a connector 4 mounted on the circuit board 20; a connector terminal 5 that is held by the connector 4 and is led out from a rear surface 4b to be connected with the circuit board 20; a case 2 housing and holding the circuit board 20 and the connector 4; and a cover 3 attached to the case 2. A pair of connector extending parts 9, 9, extending from the rear surface 4b of the connector 4 to the rear so as to sandwich both sides of a connector terminal connection part 5a connecting the connector terminal 5 with the circuit board 20, is provided in the connector 4. A dust-proof wall 11, which encloses a side periphery excluding an opening 4a side of the connector 4, is provided in the case 2.

Description

  The present invention relates to an electronic device.

An electronic control device in which an ECU and a sensor are mounted together with peripheral circuits is known. Such an electronic control device is configured, for example, by mounting an electronic component (circuit component) and an input / output connector on a substrate and housing the substrate in a housing.
In this electronic control device, when the sealing degree of the casing is low, foreign matters such as dust are liable to enter from the outside of the casing, and the circuit is liable to malfunction or malfunction.

  Conventionally, in a case for storing a printed wiring board having a connector insertion hole into which a connector is inserted, a dew condensation prevention plate for preventing dew condensation generated on an exposed conductor on the surface of the printed wiring board is provided around the connector lead and the electronic circuit board. A structure provided between the component mounting side and the component mounting side has been proposed (see, for example, Patent Document 1).

JP 2007-288211 A

  However, in the structure described in Patent Document 1, although the dew condensation prevention plate can prevent the dew condensation on the electronic component mounting side in the housing and the intrusion of dust to the electronic component mounting side, the dew condensation prevention plate prevents the lead of the connector. Since it surrounds the periphery, dust (foreign matter) tends to accumulate around the lead of this connector. For this reason, dust adheres to the connector leads, which may cause an electrical failure such as a short circuit.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent dust from entering the electronic component mounting side in the housing and the periphery of the connector terminal, causing an electrical failure such as a short circuit. It is an object of the present invention to provide an electronic device that can reliably prevent the occurrence of damage.

The electronic device according to the present invention is electrically connected to the circuit board by being mounted on the circuit board on which the electronic component is mounted, the connector mounted on the circuit board, and being pulled out from the back surface of the connector. In an electronic device comprising a connector terminal, a case for storing and holding the circuit board and the connector, and a cover attached to the case,
The connector is provided with a pair of connector extending portions extending backward from the back of the connector so as to sandwich both sides of the connector terminal connecting portion that connects the connector terminal and the circuit board,
The case is characterized in that a dustproof wall is provided to surround a side periphery excluding the opening side of the connector.

  In the electronic device, it is preferable that the dust-proof wall is provided with a protruding portion that protrudes and enters between the pair of connector extending portions.

  In the electronic device, it is preferable that the connector has a vent on the back side, and the protruding portion of the dust-proof wall protrudes facing the vent.

  Further, in the electronic device, the connector terminal has a connector terminal bent portion that is drawn toward the back side of the connector and then bent toward the circuit board side, and the protruding portion of the dustproof wall is bent to the connector terminal. It is preferable that a surface facing the connector and facing the connector terminal bent portion is formed along the bending direction of the connector terminal bent portion.

  According to the electronic device of the present invention, the case is provided with a dust-proof wall that surrounds a side periphery excluding the opening side of the connector, and the connector is sandwiched between both sides of the connector terminal connecting portion that connects the connector terminal and the circuit board. A pair of connector extensions extending from the back of the connector to the rear is provided, so the connector terminal connection is double-wrapped by the connector extension and the dust-proof wall, so that the electronic component mounting side in the housing Of course, it is possible to prevent dust from entering the periphery of the connector terminal connecting portion (connector terminal). Therefore, it is possible to reliably prevent an electrical failure such as a short circuit from being caused by the intrusion of dust.

1 is a perspective view illustrating a schematic configuration of a first embodiment of an electronic device according to the present invention. It is a figure which shows the principal part of 1st Embodiment, (a) is the AA arrow directional cross-sectional view of FIG. 1, (b) is the top view which looked at the B section of FIG. It is a figure which shows the principal part of 2nd Embodiment, (a) is the sectional view on the AA arrow of FIG. 1, (b) is the top view which looked at the B section of FIG. It is a figure which shows the principal part of 3rd Embodiment, (a) is AA arrow sectional drawing of FIG. 1, (b) is the top view which looked at the B section of FIG.

Hereinafter, an electronic device according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.
FIG. 1 is a perspective view showing a schematic configuration of an embodiment of an electronic device according to the present invention, and reference numeral 1 in FIG. 1 denotes an automobile electronic control unit (ECU).

  The electronic control device (electronic device) 1 is attached to, for example, a battery storage box (battery box) (not shown), and is connected to a battery in the battery storage box or a higher-level electronic control device by a connector wiring cable (not shown). It has become so. Alternatively, it may be directly attached to the vehicle body (vehicle frame) and electrically connected by a connector wiring cable.

  As shown in FIG. 1, the electronic control device 1 includes a resin case 2 that stores and holds a circuit board (not shown), and a resin cover 3 that is attached to the case 2. . The case 2 and the cover 3 form a housing for storing the circuit board.

  The circuit board is a printed circuit board in which a wiring pattern is formed on each surface including the inner layer, and various electronic components are mounted on the electronic component mounting side. In the present embodiment, the connector 4 is provided in front of the electronic component mounting side. Three are implemented. These connectors 4 are made of, for example, a high thermal conductive resin such as PBT (polybutylene terephthalate) or PPS (polyphenylene sulfide), and are rectangular connector openings formed between the case 2 and the cover 3. It faces the 2a and is fixed to the circuit board by screws.

  These connectors 4 have an opening 4a into which a fitting portion (not shown) of the connector wiring cable is fitted, and the opening 4a is a rectangular parallelepiped box-like shape arranged in the connector opening 2a. A plurality of connector terminals 5 are provided on the back surface opposite to the opening 4a. Based on such a configuration, the fitting portion (not shown) of the connector wiring cable is fitted into the opening 4a in the connector opening 2a and is electrically connected to the connector terminal 5, thereby being mounted on the circuit board. The various electronic components are electrically connected to a battery or the like in the battery storage box.

The detailed structure of the connector 4 and the connection between the connector terminal 5 and the circuit board will be described later.
In addition, a plurality of screw holes (not shown) are formed in the peripheral portion of the circuit board, screws are inserted into these screw holes, and screwed into screw holes (not shown) formed in the case 2. As a result, the circuit board is held and fixed to the case 2.

  The case 2 is a substantially rectangular and bottomed box-shaped box made of a resin such as PBT, and has a storage portion (not shown) for storing and holding the circuit board inside (inside) the center portion thereof. A circuit board is held in the storage section. In the case 2, as described above, three connector openings 2 a are formed corresponding to the three connectors 4 so that the openings 4 a of the connectors 4 are exposed to the outside.

  Two of these connector openings 2 a are formed on one long side of the substantially rectangular case 2. The remaining one is formed in a slope 2b formed by cutting off a corner between a long side where the two connector openings 2a are formed and a short side intersecting the long side.

Further, the case 2 has a long side where two connector openings 2a are formed, an end opposite to the inclined surface 2b, that is, one corner of the case 2, and a diagonal line thereof. An attachment portion 6 for attaching the electronic control device 1 to the battery storage box is formed at the corner portion to be performed. A mounting hole (not shown) for inserting a mounting screw is formed in the mounting portion 6, and a metal collar (not shown) is inserted into the mounting hole. The case 2 is held and fixed to the battery storage box or the like by inserting a mounting screw into the collar and screwed into the battery storage box.
The case 2 is provided with a dustproof wall that surrounds the side periphery of the connector 4. Details of the dustproof wall will be described later.

  The cover 3 has a substantially rectangular plate shape corresponding to the shape of the case 2 in plan view, is made of a resin such as PP (polypropylene), and is formed so as to close the opening of the case 2. . A plurality of locking pieces 7 are formed on the side periphery of the cover 3. The cover 3 is assembled to the case 2 in a state in which the opening of the case 2 is closed by the engagement of the engagement pieces 7 with the engagement openings 8 formed in the case 2, without screwing. It is supposed to be fixed. Note that the connector opening 2a of the case 2 is not closed by the cover 3, but the connector opening 2a is formed together with the case 2 so that the connector 4 faces the outside.

Next, as a first embodiment of the electronic device (electronic control device 1) of the present invention, the structure of the connector 4, the connection between the connector terminal 5 and the circuit board, the dust-proof wall of the case 2, etc. will be described with reference to FIG. ) And (b) will be described.
2A is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 2B is a plan view of the B portion of FIG. 2A and 2B, reference numeral 20 denotes a circuit board, and 21 denotes an electronic component mounted on the circuit board 20. As shown in FIGS. 2A and 2B, the connector 4 is arranged on the front side of the circuit board 20 on which the electronic component 21 is mounted (on the connector opening 2 a side).

  The connector 4 holds a plurality of connector terminals 5. These connector terminals 5 pass through the back surface (back plate) 4b of the connector 4 and are pulled out rearward thereof. Further, the connector terminals 5 are bent downward at a substantially right angle and electrically connected to the circuit board 20 by soldering or the like. Has been. A connection portion between the connector terminal 5 and the circuit board 20 is referred to as a connector terminal connection portion 5a.

  The connector 4 is formed with a pair of connector extending portions 9 on the back surface 4b so as to sandwich the left and right sides of the connector terminal 5 drawn out from the connector 4 and the connector terminal connecting portion 5a. These connector extending portions 9 have left and right surfaces (side surfaces) when the side surface (side plate) 4c of the connector 4 shown in FIG. 2B, that is, the surface on the circuit board 20 side is the bottom surface and the surface on the case 2 side is the top surface. 4c) is formed to extend rearward from the back surface 4b, and is formed sufficiently longer than the length of the connector terminal 5 drawn out from the back surface 4b. As a result, the connector extension portion 9 sandwiches the left and right sides of the plurality of connector terminals 5 drawn from the back surface 4b as described above, and the connector terminal connection portion 5a to which the connector terminals 5 are connected to the circuit board 20. Yes.

  The connector 4 is formed with a plurality of vent holes 10 on the back surface 4b. As shown in FIG. 2A, these vent holes 10 are arranged on the upper side (case 2 side) from the position where the connector terminal 5 is pulled out from the back surface 4b. These vent holes 10 facilitate fitting of the fitting portion by releasing air in the connector 4 when fitting the fitting portion of the connector wiring cable into the opening 4a. This is for facilitating removal of the fitting portion by allowing air to flow into 4.

  On the other hand, as shown in FIG. 2B, the case 2 is formed with a dust-proof wall 11 surrounding the side periphery of the connector 4 so as to protrude from the bottom surface of the case 2 as shown in FIG. The dust-proof wall 11 is disposed so as to surround its side periphery, that is, the side surface 4 c and the back surface 4 b except for the opening 4 a side of the connector 4. Further, on the side surrounding the back surface 4b, the side surface and the rear end of the connector extension portion 9 are disposed.

  In the present embodiment, a protruding portion 12 that protrudes and enters between the pair of connector extending portions 9 and 9 is formed at a portion surrounding the rear end of the connector extending portion 9. The projecting portion 12 is formed and arranged so as to enter between the connector extending portions 9 and 9 and project from the bottom surface side of the case 2 so as to go to the connector terminal connecting portion 5a side. The width is substantially equal to the interval between the portions 9 and 9 or slightly narrower than this interval. Further, the height is formed to be substantially equal to the height of the connector 4. With such a configuration, the projecting portion 12 enters between the pair of connector extending portions 9, 9, thereby substantially continuing to the pair of connector extending portions 9, 9, and thus between the connector extending portions 9, 9. The space to be formed is narrowed and the space is further closed.

  However, the protrusion 12 has a predetermined gap so that the surface on the back surface 4b side, that is, the facing surface 12a facing the back surface 4b does not contact the connector terminal 5 drawn out from the back surface 4b or the connector terminal connection portion 5a. The projecting length is set so as to be opened.

  In the electronic control device 1 having such a configuration, since the dust-proof wall 11 surrounding the side periphery of the connector 4 is provided in the case 2, the electronic component 21 in the housing is mounted through the connector opening 2a. The dust-proof wall 11 can prevent dust from entering the rear side. Further, since the connector 4 is provided with a pair of connector extending portions 9 so as to sandwich both sides of the connector terminal connecting portion 5a, the connector terminal 5 and the connector terminal connecting portion 5a drawn from the back surface 4b are connected to the connector extending. The portion 9 and the dust-proof wall 11 can be doubled. Therefore, it is possible to prevent dust from entering the periphery of the connector terminal 5 and the connector terminal connecting portion 5a.

In addition, since the dustproof wall 11 is provided with a protruding portion 12 that protrudes between the pair of connector extending portions 9 and 9, the protruding portion 12 can be substantially continuous with the connector extending portions 9 and 9. Therefore, by narrowing the space formed between the connector extending portions 9 and 9 and making the space more closed, it is possible to reliably prevent dust from entering the space.
Therefore, according to the electronic control device 1 of the present embodiment, it is possible to reliably prevent an electrical failure such as a short circuit from being caused by the intrusion of dust.

Next, a second embodiment of the electronic device (electronic control device 1) of the present invention will be described with reference to FIGS. 3 (a) and 3 (b). 3A is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3B is a plan view of the portion B in FIG.
The electronic control device shown in FIGS. 3A and 3B is different from the electronic control device shown in FIGS. 2A and 2B in the shape of the protruding portion 12.

  That is, the protruding portion 12 of the present embodiment has a vent hole side that protrudes opposite to the vent hole 10 of the connector 4 on the opposite surface 12a side facing the back surface 4b of the connector 4 as shown in FIG. A protruding portion 13 is formed. The vent hole side protruding portion 13 is formed such that only the upper side (case 2 side) protrudes further on the facing surface 12 a so as to face the vent hole 10. Therefore, the vent hole side protruding portion 13 is arranged on the upper side (case 2 side) of the connector terminal 5 drawn out from the back surface 4b and its connector terminal connecting portion 5a so as not to contact them. .

Although the vent-side projecting portion 13 is formed and arranged so as to be close to the vent hole 10, the function of the vent hole 10 described above can be achieved without contacting the back surface 4 b, and thus without sealing the vent hole 10. It is formed and arranged so as not to be damaged.
In addition, as in the first embodiment, the portions of the protruding portion 11 that do not form the vent-side protruding portion 13 are not connected to the connector terminal 5 drawn out from the back surface 4b or the connector terminal connecting portion 5a. Is formed with a predetermined gap.

Even in the electronic control device 1 of the present embodiment, the same operational effects as the operational effects obtained in the first embodiment can be obtained. Furthermore, by forming the vent hole side protruding portion 13 in the protruding portion 12, it is possible to more effectively prevent dust from entering the space where the connector terminal connecting portion 5 a is disposed through the vent hole 10 of the connector 4. Can be prevented.
Therefore, according to the electronic control device of the present embodiment, it is possible to more reliably prevent an electrical failure such as a short circuit from being caused by the intrusion of dust.

  The present embodiment is also applicable to the case where the vent hole 10 is formed on the lower side (circuit board 20 side) of the connector 4, for example. In that case, by forming the vent hole side protruding portion 13 so as to enter between each of the plurality of connector terminals 5 drawn from the back surface 4b, dust enters through the vent hole 10 as described above. Can be more effectively prevented.

Next, a third embodiment of the electronic apparatus (electronic control apparatus 1) of the present invention will be described with reference to FIGS. 4 (a) and 4 (b). 4A is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 4B is a plan view of the portion B of FIG.
The electronic control device shown in FIGS. 4A and 4B differs from the electronic control device shown in FIGS. 3A and 3B in that the connector terminal 5 is pulled out to the back surface 4b side of the connector 4. And the shape of the protrusion 12.

  That is, in this embodiment, after the connector terminal 5 is pulled out from the back surface 4b of the connector 4, the connector terminal 5 is bent at an obtuse angle as shown in FIG. A bent portion 5b is formed. As a result, the connector terminal 5 is disposed so as to extend to the rear of the back surface 4b of the connector 4 as much as the connector terminal bent portion 5b is formed as compared with the embodiment shown in FIGS. 2 (a) and 3 (a). Yes.

  The connector terminal 5 is connected to the circuit board 20 after the connector terminal bent portion 5b to form the connector terminal connecting portion 5a as in the above embodiment. However, the connector terminal connecting portion 5a may be formed through the circuit board 20 as shown in FIGS. 2 (a) and 3 (a), and the circuit board as shown in FIG. 4 (a). It may be formed along the surface of 20.

  As shown in FIG. 4A, a slope 14 is formed on the projecting portion 12 below the portion where the vent-side projecting portion 13 is formed on the facing surface 12a side facing the back surface 4b of the connector 4. Yes. The slope 14 is a surface that faces the connector terminal bent portion 5b and is formed along the bending direction of the connector terminal bent portion 5b. In other words, the connector 4 is formed so as to move away from the back surface 4 b of the connector 4 as it goes downward (from the vent hole side protruding portion 13 side) (circuit board 20 side). With such a configuration, the projecting portion 12 can narrow the space in which the connector terminal bent portion 5b is formed to a minimum size without contacting the connector terminal bent portion 5b.

Even in the electronic control device 1 of the present embodiment, the same operational effects as those obtained in the first and second embodiments can be obtained. Further, since the connector terminal bent portion 5b is formed in the connector terminal 5, and the inclined surface 14 is formed in the protruding portion 12 along the bending direction of the connector terminal bent portion 5b, as described above, the connector terminal bent portion 5b. Therefore, it is possible to prevent the dust from entering the space in which the connector terminal bent portion 5b and the connector terminal connecting portion 5a are disposed.
Therefore, according to the electronic control device of the present embodiment, it is possible to more reliably prevent an electrical failure such as a short circuit from being caused by the intrusion of dust.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the protruding portion 12 is formed on the dust-proof wall 11, but the present invention is not limited to this, and the dust-proof wall 11 is simply formed so as to surround the side periphery excluding the opening 4a side of the connector 4. May be.
In this case, not only can the side surface 4c of the connector 4 be extended rearward from the back surface 4b of the connector extension portion 9, but the upper surface of the connector 4 (the surface on the case 2 side) can be It is good also as the connector extension part 9 extended to the direction. Thus, by forming the connector extension part 9 in three directions on the left and right and the upper side, it is possible to more effectively prevent dust from entering the space where the connector terminal connection part 5a is disposed.

  Moreover, in the said embodiment, although the electronic device of this invention was applied to the electronic control apparatus for motor vehicles, this invention is not limited to this, It is attached to the to-be-attached body which consists of battery storage boxes other than a motor vehicle. It is applicable to all electronic devices.

DESCRIPTION OF SYMBOLS 1 ... Electronic control apparatus (electronic device), 2 ... Case, 2a ... Connector opening part, 3 ... Cover, 4 ... Connector, 4a ... Opening, 4b ... Back surface, 4c ... Side surface, 5 ... Connector terminal, 5a ... Connector terminal Connection part, 5b ... Connector terminal bending part, 9 ... Connector extension part, 10 ... Vent hole, 11 ... Dust-proof wall, 12 ... Projection part, 12a ... Opposing surface, 13 ... Vent hole side projection part, 14 ... Slope, 20 ... Circuit board (board), 21 ... Electronic components

Claims (4)

A circuit board on which electronic components are mounted;
A connector mounted on the circuit board;
A connector terminal that is held by the connector and is electrically connected to the circuit board by being pulled out from the back surface of the connector;
A case for storing and holding the circuit board and the connector;
In an electronic device comprising a cover attached to the case,
The connector is provided with a pair of connector extending portions extending backward from the back of the connector so as to sandwich both sides of the connector terminal connecting portion that connects the connector terminal and the circuit board,
The electronic device according to claim 1, wherein the case is provided with a dustproof wall that surrounds a side periphery excluding the opening side of the connector.   The electronic device according to claim 1, wherein the dust-proof wall is provided with a protruding portion that protrudes and enters between the pair of connector extending portions. The connector is provided with a vent on the back side,
The electronic device according to claim 2, wherein the protruding portion of the dustproof wall protrudes facing the vent hole. The connector terminal has a connector terminal bent portion that is bent toward the circuit board side after being pulled out to the back side of the connector,
The protruding portion of the dustproof wall is opposed to the connector terminal bent portion, and a surface facing the connector terminal bent portion is formed along a bending direction of the connector terminal bent portion. Item 4. The electronic device according to Item 2 or 3.

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