JP2006245143A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus which can establish the continuity between a ground pattern on a circuit board and the container of the electronic apparatus, and can certainly hold the circuit board within the container. <P>SOLUTION: In an electronic controller 1, a cover 4 which is a lid of a casing 3 for storing and holding a printed board 2 consists of a ground member 41 which is brought into contact by pressure with the ground pattern 21 formed on the printed board 2, to establish the continuity between the cover 4 and the ground pattern 21; and an energizing means 42 which is brought into contact by pressure with the printed board 2 to energize the printed board 2 toward a bottom part 3b opposite from an opening portion 3a of the casing 3. Due to this structure, when the cover 4 is fixed to the casing wherein the printed board 2 is inserted, the continuity is established between the ground pattern 21 on the printed board 2 and the casing 3, and at the same time, the printed board 2 can be surely held inside the casing 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic device that contains a circuit board on which various electronic components and the like are mounted in a container. In particular, it is suitable for use in controlling various devices mounted on vehicles and the like.

  As a conventional electronic device, for example, a device used as a control device for various devices mounted on a vehicle, a circuit board is housed in a metal container and the opening of the container is covered with a metal lid. It is used.

  In general, a vehicle body structure is electrically grounded in a vehicle. Further, since the electronic device is fixed to the vehicle body, the container of the electronic device is electrically connected to the ground of the vehicle. Therefore, in order to make the ground pattern on the circuit board conductive to the vehicle body structure which is the ground of the vehicle, it is necessary to make the ground pattern on the circuit board and the container of the electronic device conductive.

  In a conventional electronic device, a conductive member made of a conductive material soldered to a ground pattern on a circuit board is pressed against the inner wall of the container while being elastically deformed, and the ground pattern on the circuit board and the container of the electronic device are brought into contact with each other. Conducted. At the same time, the circuit board is held in the container by pressing the circuit board against the container by the urging force generated by the elastic deformation of the conductive member.

  In the conventional electronic device described above, a conductive member for connecting the ground pattern on the circuit board and the container of the electronic device is necessary, and there is a problem that the number of parts and the number of assembling steps increase.

  Further, in order to minimize the increase in the number of parts and the number of assembling steps, the number of conductive members is usually set to one. For this reason, there exists a problem that the urging | biasing force holding a circuit board in a container varies.

  The present invention has been made in view of the above-described problems. With a simple configuration, the ground pattern on the circuit board is electrically connected to the container of the electronic device, and at the same time, the circuit board is securely placed in the container. An object is to provide an electronic device that can be held.

  In order to achieve the above object, the present invention employs the following technical means.

  The electronic device according to claim 1 of the present invention is fixed to the container so as to cover a bottomed container made of a metal material, a circuit board housed and held in the container, and an opening of the container made of the metal material. An electronic device including a lid, the lid is fixed to the container so as to be electrically conductive, and the lid is pressed against a ground pattern formed on the circuit board to electrically connect the lid and the ground pattern to the circuit. And an urging unit that urges the circuit board toward the side opposite to the opening by pressing and contacting the board.

  With such a configuration, by inserting the circuit board into the container and fixing the lid to the container, electrical connection between the ground pattern on the circuit board and the container of the electronic device is ensured, and the circuit board is securely placed in the container. Holding is complete. Further, the conductive member soldered to the circuit board in the conventional electronic device is not necessary.

  Accordingly, it is possible to provide an electronic device capable of securely holding the circuit board in the container while at the same time establishing electrical connection between the ground pattern on the circuit board and the container of the electronic device by adopting a simple configuration. it can.

  The electronic device according to claim 2 of the present invention is characterized in that at least one of the grounding member and the biasing means is formed in a leaf spring shape.

  Accordingly, at least one of the grounding member and the biasing means can be easily formed, and the magnitude of the pressing force to the ground pattern on the circuit board or the magnitude of the biasing force to push the circuit board toward the container is desired. Can be easily set.

  The electronic device according to claim 3 of the present invention is characterized in that at least one of the grounding member and the biasing means is formed integrally with the lid.

  Thereby, while reducing the number of parts which comprise an electronic device, an assembly man-hour can be reduced.

  The electronic apparatus according to claim 4 of the present invention is characterized in that the direction urging means for pressing the circuit board by the ground member is displaced by about 90 degrees from the direction for urging the circuit board.

  Thus, the circuit boards are pressed against the container with a force in a direction that forms an angle of approximately 90 degrees with each other. Therefore, the circuit board can be reliably held in the container.

  Hereinafter, an electronic apparatus according to the present invention will be described with reference to the drawings, taking as an example a case where the electronic apparatus is applied to an electronic control device that is installed in a vehicle cabin and controls the operation of various devices installed in the automobile.

  FIG. 1 is an exploded perspective view showing a configuration of an electronic control device 1 which is an electronic apparatus according to an embodiment of the present invention.

  2 is a cross-sectional view taken along line II-II in FIG.

  FIG. 3 is a cross-sectional view of the cover 4 alone of the electronic control device 1 according to the embodiment of the present invention, and corresponds to a cross-sectional view taken along line II-II in FIG. In FIG. 3, a broken line indicates a shape in a state where the cover 4 is fixed to the casing 3.

  The electronic control device 1 is roughly divided into a printed circuit board 2 that is a circuit board on which electronic components such as a microcomputer are mounted and fulfills a control function in the electronic control device 1, a casing 3 that is a container for housing the printed circuit board 2, and a casing. 3 and a cover 4 that is a lid of 3.

  The printed circuit board 2 that is a circuit board is formed of, for example, a glass epoxy board or the like, and forms an electric circuit portion of the electronic control device 1. A ground pattern 21 is formed on the surface of the printed board 2 as shown in FIG. The ground pattern 21 is made of, for example, copper foil or the like, and is formed as a part of a conductor pattern (not shown) that forms the electrical wiring of the printed circuit board 2. When the electronic control device 1 is fixed to the automobile, the ground pattern 21 is to be conducted to a vehicle body that is a ground of an electric circuit in the automobile. A connector 5 is attached to the printed circuit board 2 as shown in FIG. As shown in FIG. 1, the connector 5 includes terminals 51 made of a plurality of conductive members, and these terminals 51 are soldered to a conductor pattern (not shown) of the printed circuit board 2. The electronic control device 1 is electrically connected to a vehicle-side device or the like to be controlled by fitting the connector 5 with a connector (not shown) of a wire harness that is electric wiring on the vehicle side. .

  A casing 3 as a container for housing and holding the printed circuit board 2 is formed in a bottomed shape from a metal material such as aluminum. As shown in FIG. 2, the printed circuit board 2 is accommodated in the casing 3 along the direction from the opening 3a toward the bottom 3b opposite to the opening 3a. As shown in FIG. 1, the casing 3 is provided with a guide groove 31 for holding the printed circuit board 2. As shown in FIG. 1, a pair of guide grooves 31 are provided facing each other, and holds the printed circuit board 2 at both ends thereof. The groove width h of the guide groove 31 is set slightly larger than the plate thickness t of the printed circuit board 2. Thereby, the operation | work which mounts the printed circuit board 2 in the casing 3 can be performed easily. As shown in FIG. 2, a pressing portion 33 is provided on the bottom 3 b of the casing 3. When the printed circuit board 2 is inserted into the case 3, the holding portion 33 abuts against the end of the printed circuit board 2 as shown in FIG. 2, and suppresses the vertical movement of the printed circuit board 2 in FIG. 2. ing. In the electronic control device 1 according to an embodiment of the present invention, the casing 3 is formed by drawing an aluminum plate, and the guide groove 31 and the pressing portion 33 described above are also formed at the time of drawing. Further, the casing 3 is provided with a locking claw 32 for fixing a cover 4 described later.

  The cover 4 which is a lid fixed to the casing 3 so as to cover the opening 3a of the casing 3 is formed of a metal material, for example, a steel plate. As shown in FIG. 1, the cover 4 is provided with a locking hole 43 for engaging with the locking claw 32 of the casing 3 and fixing the cover 4 to the casing 3. As shown in FIG. 1, the cover 4 is provided with an opening hole 44. The opening hole 44 is for projecting the connector 5 of the printed circuit board 2 to the outside of the cover 4 (left side in FIG. 2) so that the connector 5 can be fitted to a connector (not shown) of a wire harness on the vehicle side. . In the electronic control device 1 according to the embodiment of the present invention, the cover 4 is formed by pressing a steel plate, and the locking hole 43 and the opening hole 44 are formed in this pressing step.

  Here, the process of attaching the cover 4 to the casing 3 will be briefly described. First, the cover 4 is brought into contact with the end of the casing 3 while the locking claw 32 of the casing 3 is fitted into the locking hole 43 of the cover 4. Next, the portion of the locking claw 32 protruding from the cover 4 is caulked as shown in FIG. Thereby, the cover 4 is fixed to the casing 3.

  As shown in FIG. 2, when the cover 4 is fixed to the casing 3, the cover 4 has a grounding member 41 that presses and contacts the ground pattern 21 of the printed circuit board 2 to conduct the cover 4 and the ground pattern 21, and An urging means 42 for urging the printed circuit board 2 toward the bottom 31 of the casing 3 by pressing and contacting the printed circuit board 2 is provided. The grounding member 41 and the biasing means 42 are also formed at the same time when the cover 4 is press-molded.

  In a state where the cover 4 is fixed to the casing 3, the grounding member 41 is elastically deformed by a displacement v upward from FIG. 3 from its single state as shown in FIG. The pattern 21 is in press contact. That is, the grounding member 41 biases the printed circuit board 2 downward in FIG. 2 (in the direction of arrow A in FIG. 2). Thereby, the ground pattern 21 of the printed circuit board 2 is electrically connected to the casing 3 that is a container via the grounding member 41.

  By the way, the electronic control unit 1 is fixed to the body of the automobile via a metal bracket or the like (not shown). Therefore, the ground pattern 21 of the printed circuit board 2 is electrically connected to the vehicle body, which is an electrical ground of the automobile, via the ground member 41 of the cover 4 and the casing 3.

  On the other hand, in a state where the cover 4 is fixed to the casing 3, as shown in FIG. 3, the biasing member 42 is elastically deformed from the single state to the left in FIG. It is in press contact with the end of the substrate 2. That is, the urging member 42 urges the printed circuit board 2 toward the right side in FIG. 2 (in the direction of arrow B in FIG. 2).

  That is, in the electronic control device 1 according to the embodiment of the present invention, in the state where the cover 4 is fixed to the casing 3, the direction in which the ground member 41 urges the printed circuit board 2 (the direction of arrow A in FIG. 2). The direction in which the urging member 42 urges the printed circuit board 2 (the direction of the arrow B in FIG. 2) is almost 90 degrees. Thereby, the printed circuit board 2 is reliably held in the casing 3.

  The grounding member 41 and the urging member 42 are shaped so that the elastic force with which the grounding member 41 and the urging member 42 urge the printed circuit board 2 in a state where the cover 4 is fixed to the casing 3 is a predetermined amount. It is set to be. Here, the predetermined magnitude of the elastic force is, for example, that the printed circuit board 2 does not move in the casing 3 due to vibrations during operation of the automobile and the operator manually works in the process of fixing the cover 4 to the casing 3. The size is such that the locking claw 32 can be fitted into the locking hole 43.

  In the electronic control device 1 according to the embodiment of the present invention described above, the cover 4 is fixed to the casing 3 in which the printed board 2 is accommodated and held so as to be conductive, and the cover 4 is formed on the printed board 2. The grounding member 41 that presses and contacts the ground pattern 21 to conduct the cover 4 and the ground pattern 21 and the printed circuit board 2 by pressing and contacting the printed circuit board 2 are attached to the bottom 3b opposite to the opening 3a. And a biasing means 42 for biasing.

  By adopting such a configuration, when the cover 4 is fixed to the casing 3 in which the printed board 2 is inserted, the ground pattern 21 on the printed board 2 and the casing 3 are electrically connected, and at the same time, the printed board 2 is It is securely held by the casing 3. This eliminates the need for a conducting member that performs the function of conducting the circuit board and the container in the conventional electronic device.

  As a result, the electronic control device 1 capable of establishing electrical connection between the ground pattern 21 on the printed circuit board 2 and the casing 3 and, at the same time, securely holding the printed circuit board 2 in the casing 3 by adopting a simple configuration. Can be realized.

  In the electronic control device 1 according to the embodiment of the present invention, the grounding member 41 and the biasing member 42 are formed integrally with the cover 4.

  Thereby, while reducing the number of parts which comprise the electronic controller 1, an assembly man-hour can be reduced.

  In the electronic control device 1 according to the embodiment of the present invention, the direction in which the grounding member 41 urges the printed circuit board 2 and the urging member 42 urges the printed circuit board 2 in a state where the cover 4 is fixed to the casing 3. The direction of movement is different by approximately 90 degrees. Thereby, since it can prevent reliably that the printed circuit board 2 moves in the casing 3, the printed circuit board 2 can be hold | maintained more reliably in the casing 3. FIG.

  In the electronic control device 1 according to the embodiment of the present invention described above, the number of the ground members 41 and the urging members 42 is two. However, the number is not limited to two, and one each. Any number can be used. Furthermore, the number of ground members 41 and biasing members 42 need not be the same, and the number of both may be different.

  In the electronic control apparatus 1 according to the embodiment of the present invention described above, the material of the casing 3 is aluminum. However, the material is not limited to this, and other materials can be used as long as they are conductive metals. Also good. Also, the manufacturing method may be a method other than drawing, such as casting.

  Further, in the electronic control device 1 according to the embodiment of the present invention described above, the material of the cover 4 is a steel plate. However, the material is not limited to this, and other materials can be used as long as they are conductive metals. Also good.

  Moreover, although the embodiment of the electronic device of the present invention has been described by taking the electronic control device 1 mounted in an automobile as an example, it is not necessary to be limited to the electronic control device 1 for an automobile. The present invention may be applied to various devices such as consumer devices.

It is a disassembled perspective view which shows the structure of the electronic control apparatus 1 which is an electronic device by one Embodiment of this invention. It is the II-II sectional view taken on the line in FIG. It is sectional drawing of the cover 4 single-piece | unit of the electronic control apparatus 1 by one Embodiment of this invention, and is equivalent to the II-II sectional view taken on the line in FIG.

Explanation of symbols

1 Electronic control device (electronic equipment)
2 Printed circuit board (circuit board)
21 Ground pattern 3 Casing (container)
3a Opening part 3b Bottom part 31 Guide groove 32 Locking claw 33 Holding part 4 Cover (lid)
41 grounding member 42 biasing means 43 locking hole 44 opening hole 5 connector 51 terminal A biasing direction B biasing direction h displacement t plate thickness dimension v displacement w width dimension

Claims (4)

A bottomed container made of a metal material;
A circuit board housed and held in the container;
An electronic device comprising a lid made of a metal material and fixed to the container so as to cover the opening of the container,
The lid is fixed to the container so as to be conductive,
The lid presses and contacts the ground pattern formed on the circuit board to connect the lid and the ground pattern, and the circuit board is opposed to the opening. And an urging means for urging toward the side.   The electronic device according to claim 1, wherein at least one of the ground member and the biasing unit is formed in a leaf spring shape.   The electronic device according to claim 1, wherein at least one of the grounding member and the biasing unit is formed integrally with the lid.   The direction in which the grounding member presses the circuit board is shifted by approximately 90 degrees from the direction in which the biasing means biases the circuit board. Electronic equipment.

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