JP2006344807A - Electric apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reliably attempt a conduction for grounding a board and a shield case and facilitate an attachment and detachment of the board to/from the shield case. <P>SOLUTION: A shield case 4 is constituted of a case body 6 and a case cover 7. A plurality of pairs of support parts 10, 11 are provided which guide an insertion of a board 5 into the case body 6, support the board 5 after insertion and have conductivity and spring properties. The board 5 is provided with a grounding conductor which comes into contact with the supports 10, 11 in a state of being inserted into the case body 6, and the case cover 7 is provided with a press member 13 for pressing the rear end of the inserted board 5 in an insertion direction thereof, to the insertion direction elastically. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric device having a configuration in which a substrate is inserted and arranged in a shield case.

Conventionally, as a structure in which a substrate is arranged in a shield case, there is a configuration disclosed in Patent Document 1. In this case, a large number of screw holes are formed in the periphery of a rectangular substrate, and a number of screw seats are formed inside the flat shield case main body so as to face the screw holes, and the substrate is attached to the shield case. It arrange | positions in the said screw seat, and it is made to arrange | position a board | substrate in a shield case by screwing to the said screw seat through the said screw hole. The opening of the shield case is closed with a case cover. In this case, the case cover is attached to the shield case by sliding, and at this time, the flange provided on the back surface of the case cover comes into contact with the ground contact surface of the shield case opening surface and becomes conductive.
Japanese Patent Laid-Open No. 10-326988

  In the above conventional device, the continuity for grounding between the substrate and the shield case is uncertain. In addition, when the substrate is attached to or removed from the shield case, it is necessary to perform screw tightening and unscrewing operations, and it is troublesome to attach and remove the substrate from the shield case. Furthermore, when the board is configured to be screwed in this way, when arranging a plurality of stages of boards in the shield case, each board must be screwed one by one, which is troublesome and removes the board once attached. It becomes quite difficult.

  The present invention has been made in view of the above-described circumstances, and its purpose is to ensure electrical connection for grounding between the substrate and the shield case, and to facilitate attachment and removal of the substrate to and from the shield case. To provide electrical equipment.

  The invention according to claim 1 is an electric device having a configuration in which a substrate is inserted and arranged in a shield case including a case main body and a case cover for closing an opening of the case main body, the electric device being provided in the case main body, A guide part for guiding the insertion of the board into the inside and a support part having conductivity and springiness for supporting the board after the insertion, and the support part provided in the board and inserted in the case body And a pressing member that is provided on the case cover and elastically presses the rear end of the inserted board in the insertion direction in the insertion direction.

  According to the first aspect of the present invention, when the substrate is inserted into the case body using the support portion as a guide, the substrate is supported by the support portion at a position after the insertion, and the support portion is provided on the substrate. Conducts in contact with the grounding conductor. In this case, the contact force of the support portion with respect to the grounding conductor portion acts by the spring force of the support portion, and conduction is ensured. Thereafter, when the opening of the case body is closed by the case cover, the substrate is elastically pressed by the pressing member. Accordingly, the substrate can be attached to the case main body with a simple insertion operation and can be easily taken out. Furthermore, since the substrate is elastically supported by the springy support portion and the elastic pressing member, it is strong against external vibration. As a result, electrical connection for grounding between the substrate and the shield case can be reliably achieved, contributing to the improvement of EMC, and the attachment and detachment of the substrate to and from the shield case are facilitated, and the device is resistant to vibration.

  In this case, the pressing member may be made of a conductive material, and a pressing conductor grounding conductor portion in contact with the pressing member may be provided on an end surface portion of the substrate facing the pressing member. In this manner, the continuity for grounding can be achieved even in the pressing member portion, and the continuity for grounding between the shield case and the substrate is further ensured.

  The grounding conductor portion may be formed on both front and back surfaces of the substrate, and the support portion may be provided so that the grounding conductor portions on the front and back surfaces of the substrate are pressed from both front and back sides. 3), this is more effective for ensuring conduction and reducing vibration of the substrate.

Further, the support part and the pressing member may be provided in a plurality of stages, and a plurality of substrates may be supported by the support part of each stage and pressed by the pressing member of each stage (invention of claim 4), In this way, even when there are a plurality of substrates, it is possible to ensure conduction between these substrates and the shield case, to easily attach and remove the substrate to / from the shield case, and to reduce vibration.
Further, the shield case may be grounded (invention of claim 5), and this can further contribute to EMC improvement.

  Hereinafter, an embodiment in which the present invention is applied to a vehicle navigation apparatus will be described with reference to the drawings. FIG. 2 shows a vehicle navigation apparatus 1 as an electric device. The navigation device 1 includes a control unit 2 and a display unit 3. The controller 2 has a configuration in which a plurality of, for example, three substrates 5 are inserted and arranged in the shield case 4 as shown in FIG. The control unit 2 will be described.

  The shield case 4 includes a case body 6 and a case cover 7. The case body 6 is made of a conductive metal plate and has a rectangular tube shape. One opening portion of the case body 6 is closed by the display portion 3, and the other opening portion 6 d is closed by the case cover 7 with, for example, a screw (not shown). Also, as shown in FIG. 7, partition plates 8 and 9 are attached to the case main body 6 so as to divide the interior of the case body 6 into three substrate placement spaces 6a, 6b, and 6c.

  In the board placement space 6a, for example, four support portions 10 are attached to the left and right portions of the inner bottom surface 6e of the case body 6, and the four support portions 10 are attached to the left and right portions of the lower surface of the partition plate 8. The four support parts 11 are attached so as to make a vertical pair. As shown in FIG. 3, the lower support portion 10 is made of a metal plate having electrical conductivity and spring property, and includes a mounting base end portion 10 a, a linear portion 10 b extending upward, And a circular arc portion 10c that bends in an arc shape in the direction of insertion of the substrate. The upper support portion 11 is also made of a metal plate having electrical conductivity and spring property, and has an arcuate shape in the right direction in the drawing (substrate insertion direction), the attachment base end portion 11a, the linear portion 11b extending downward. And a circular arc part 11c that bends in a circle.

The dimension between the gaps between the upper and lower support parts 10 and 11 is set to be smaller than the thickness dimension of the substrate 5, and when the substrate 5 is inserted, it is elastically deformed as shown in FIG. Thus, the substrate 5 is supported by exerting a spring force so as to be sandwiched from above and below (front and back).
Similarly, in the substrate placement spaces 6b and 6c, the support portions 10 and 11 that are paired up and down similarly have the same shape and mounting form, and the upper surface of the partition plate 8, the lower and upper surfaces of the partition plate 9, and the ceiling of the case body 6 It is attached to the surface.

The case cover 7 is made of a conductive metal plate, and connector insertion holes 12 are formed in the upper and lower portions of the case cover 7. Furthermore, pressing members 13 are attached to the left and right sides of the connector insertion holes 12 on the back surface of the case cover 7. The pressing member 13 is positioned corresponding to both the front side and the opposite side of the rear end (left end in the figure) of the substrate 5 inserted into the case body 6.
As shown in FIGS. 8 and 9, the pressing member 13 is composed of a conductive and springy (elastic) metal plate, and is bent in a substantially mountain shape, with its tip portion being It is bent inward.

  In each substrate 5, grounding conductor portions 14 are formed on the left and right sides of the front and back surfaces along the insertion direction (the direction of arrow A in FIG. 6). The grounding conductor portion 14 is formed by printing a copper foil pattern. Further, in this substrate 5, pressing member grounding conductor portions 15 are formed continuously from the grounding conductor portion 14 on both sides of the rear end face (left end in the drawing). In addition, board-to-board connectors 16 and 17 are provided at the center of the front end of the substrate 5 and the center of the rear end of the board, respectively.

  Now, an example of a procedure for arranging the above-described substrates 5 in the shield case 4 will be described. In a state where the case cover 7 is removed (see FIG. 7), each substrate 5 is inserted into the case body 6 so as to be inserted between the support portions 10 and 11. At this time, the insertion of the substrate 5 is guided by the support portions 10 and 11, and the support portions 10 and 11 are elastically deformed. And the board | substrate 5 is inserted to the back and the board | substrate board | substrate connector 17 of the insertion front end part is connected with the display part 3 side.

  In the state after the insertion, the support portions 10 and 11 are elastically deformed, and the spring force is exerted on the substrate 5 from above and below (front and back) to support it. Further, the support portions 10 and 11 are in contact with the grounding conductor portions 14 and 14 in a pressure contact state, respectively.

  Thereafter, the case cover 7 is attached so as to close the opening 6 d of the case body 6. At this time, the pressing member 13 comes into pressure contact with the pressing conductor grounding conductor portions 15 on both the front side and the opposite side of the rear end (left end in the drawing) of the substrate 5 from the state shown in FIG. 8, as shown in FIG. Elastically deforms. Accordingly, the pressing member 13 elastically presses the rear end surface portion of the substrate 5 in the insertion direction in the insertion direction. When the case cover 7 is attached, the board-to-board connector 16 faces the outside through the connector insertion hole 12. The shield case 4 is grounded to a vehicle (not shown).

  As described above, according to this embodiment, when the substrate 5 is inserted into the case main body 6 using the support portions 10 and 11 as a guide, the substrate 5 is supported by the support portions 10 and 11 at a position after the insertion. At the same time, the support portions 10 and 11 are brought into contact with the grounding conductor portion 14 of the substrate 5 to be conducted. In this case, the contact pressure of the support portions 10 and 11 acts on the grounding conductor portion 14 by the spring force of the support portions 10 and 11, and conduction is ensured. Thereafter, when the opening of the case body 6 is closed by the case cover 7, the substrate 5 is elastically pressed by the pressing member. Therefore, the substrate 5 can be attached to the case body 6 by a simple insertion operation and can be easily taken out. Furthermore, since the substrate 5 is elastically supported by the spring-like support portion and the elastic (spring property) pressing member 13, it is strong against external vibration (vertical vibration). As a result, electrical connection for grounding between the substrate 5 and the shield case 4 can be ensured, contributing to improvement of EMC (electromagnetic environment compatibility), and attachment and removal of the substrate 5 to and from the shield case 4 are facilitated. It will be resistant to vibration.

  Further, the pressing member 13 is made of a conductive material, and the pressing member grounding conductor portion 15 that comes into contact with the pressing member 13 is provided on the end surface of the substrate 5 facing the pressing member 13. Conduction for grounding can be achieved even in the member 13 portion, and conduction for grounding between the shield case 4 and the substrate 5 is further ensured.

  Further, the grounding conductor portion 14 is formed on both the front and back surfaces of the substrate 5, and the support portions 10 and 11 are provided so as to hold the grounding conductor portions 14 on the front and back surfaces of the substrate 5 from both the front and back sides. This is more effective for ensuring conduction and reducing vibration of the substrate 5.

  In addition, since the support portions 10 and 11 and the pressing member 13 are provided in a plurality of stages, the plurality of substrates 5 are supported by the support portions 10 and 11 in each step and are pressed by the pressing members 13 in each step. Even if there are a plurality of substrates 5, it is possible to ensure conduction between these substrates 5 and the shield case 4, to facilitate the attachment and removal of the substrate 5 with respect to the shield case 4, and to reduce vibration.

  Further, since the shield case 4 is grounded to the vehicle, EMC (electromagnetic environment compatibility) can be improved. That is, sufficient GND cannot be obtained by the GND contact of the connector 16 alone. However, in this embodiment in which the contact between the substrate 5 and the shield case 4 is reliable, sufficient ground can be obtained by grounding the shield case 4 to the vehicle. As a result, it can further contribute to EMC improvement.

  In the above embodiment, the present invention is applied to a navigation device for a vehicle. However, the present invention can be applied to a wide range of electrical equipment in addition to this. Further, the shape and the number of the support portions or the pressing portions can be appropriately changed and implemented.

Sectional drawing which follows the BB line of FIG. 2 which shows one Example of this invention Perspective view of navigation device Longitudinal side view of support part Longitudinal side view of the support part with the board inserted Perspective view of the back side of the case cover Perspective view of board A perspective view of the navigation device before the board is inserted Longitudinal side view of pressing member before pressure contact Longitudinal side view of pressing member in pressure contact state

Explanation of symbols

  In the drawings, 1 is a navigation device (electrical device), 2 is a control unit, 4 is a shield case, 5 is a substrate, 6 is a case body, 7 is a case cover, 8 and 9 are partition plates, 10 and 11 are support units, Reference numeral 13 denotes a pressing member, 14 denotes a grounding conductor, and 15 denotes a pressing member grounding conductor.

Claims (5)

An electric device having a configuration in which a substrate is inserted and arranged in a shield case composed of a case main body and a case cover for closing an opening of the case main body,
A support portion provided in the case main body, which guides the insertion of the substrate into the case main body and has conductivity and springiness to support the substrate after insertion;
A grounding conductor provided on the substrate and in contact with the support in an inserted state in the case body;
An electrical device comprising: a pressing member that is provided on the case cover and elastically presses a rear end of the inserted substrate in the insertion direction in the insertion direction. In the electric equipment according to claim 1 or 2,
The pressing member is made of a conductive material,
An electric apparatus comprising a pressing member grounding conductor portion in contact with the pressing member provided on an end surface portion of the substrate facing the pressing member. In the electric equipment according to claim 1 or 2,
The grounding conductor is formed on both front and back surfaces of the substrate,
The electric device according to claim 1, wherein the support portion is provided so as to press down the grounding conductor portions on both the front and back sides of the substrate from both the front and back sides. The electric device according to any one of claims 1 to 3,
The support part and the pressing member are each provided in a plurality of stages,
An electric apparatus characterized in that a plurality of substrates are supported by a support portion of each step and pressed by a pressing member of each step. The electric device according to any one of claims 1 to 4,
The electrical device, wherein the shield case is grounded.

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