JPH08250886A - Electric board - Google Patents

Abstract

PURPOSE: To provide an electric board which can be mounted/removed from and electrically connected to a mother board easily by reducing influence due to radiation noise between respective subsidiary boards and correcting deflection generated on the board att the time of mounting components. CONSTITUTION: When a subsidiary board 10 is connected to a mother board 20, a metal plate 13 connected and fixed in parallel to the rear of a board 12 constituting the subsidiary board 10 via a plurality of resin spacers 14 is inserted into a support side 31a of a slide rail 31 incorporating a conductive shield finger electrically connected to a housing 30, and a connector 11 provided on the board 12 of the subsidiary board 10 is connected to a connector 21 provided on the mother board 20. Since the metal plate 13 of the subsidiary board 10 is electrically connected to the grounded housing 30 via the slide rail 31 incorporating the conductive shield finger, influence by radiation noise of each subsidiary board is shielded by the metal plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric board to which a plurality of child boards can be electrically and detachably connected to a parent board.

[0002]

2. Description of the Related Art In recent years, multifunctionalization and downsizing of devices have been promoted due to miniaturization and combination of internal mounting parts. Then, when connecting the boards such as the parent board and the child board, it is possible to connect without a cable by using a connector, and the cable necessary for connecting the circuit board and the circuit board is eliminated, and Circuit board maintenance work has been greatly improved.

Japanese Patent Laid-Open No. 57-177599 and Japanese Utility Model Application Laid-Open No. 64-29890 make it possible to attach / detach to / from a parent board by supporting both ends of a plurality of child boards in guide grooves provided in a housing. There is shown an electric board which is electrically connected through electric contacts provided on a parent board when the child board is inserted along the guide groove.

However, the child board electrically and detachably connected to the parent board as described above may need to be grounded on the electric circuit or for reasons such as noise countermeasures. At this time, the child board and the parent board are electrically connected to a grounded housing via a contact that is electrically connected, or the child board and a guide groove for supporting the child board are electrically connected. It was connected and electrically connected to the grounded housing via the guide groove.

[0005]

However, the above-mentioned JP-A-57-177599 and JP-A-64-2989 are known.
In the electric board disclosed in Japanese Patent No. 0, a plurality of child boards connected to the parent board are arranged close to each other, so that the influence of radiation noise generated between the child boards is affected. It was easy to receive. For this reason, although it has been attempted to connect to the grounded housing via the electrical contacts between each child board and the parent board, there is a problem that the resistance value with respect to the grounded portion becomes large.

Further, since each child board is attached and detached directly along the guide groove, if the warp generated when the components are mounted remains on the child board, the child board is smoothly attached and detached to and from the guide groove. Not only can it not be performed, but the position of the connector disposed on the child board and the position of the connector on the parent board are displaced, which makes it difficult to electrically connect the parent board and the child board. there were.

The present invention has been made in view of the above circumstances, and reduces the influence of radiation noise between the respective sub-boards, and corrects the warp generated in the board during mounting of components to attach or detach the board. It is also an object of the present invention to provide an electric board that can be easily electrically connected to a parent board.

[0008]

An electric board according to the present invention is an electric board to which a plurality of child boards can be electrically and detachably connected to a parent board. The substrate of the sub-board, which comprises a substrate to be installed, a conductive plate-shaped member arranged in parallel on the back side of the substrate, and a fixing means for fixing the plate-shaped member and the substrate in parallel. Both ends of the strip-shaped member are inserted into a support member having conductivity, which is connected to a grounded housing, and connected to the parent board.

[0009]

According to this structure, the plate-like member arranged in parallel with the back surface side of the substrate constituting the sub-substrate corrects the warp generated on the substrate during component mounting. In addition, a conductive plate-like member is provided on each child board, and the plate-like member is supported by a conductive support member electrically connected to a grounded housing, thereby providing a space between the child boards. The influence of the radiation noise generated at is reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 relate to a first embodiment of the present invention, FIG. 1 is an explanatory diagram showing a schematic configuration of a child board, FIG. 2 is a perspective view illustrating the configurations of a parent board and a housing, and FIG. 2 is a front view of FIG. 4, FIG. 4 is a perspective view illustrating a slide rail with a built-in shield finger, and FIG. 5 is a perspective view illustrating a relationship between a child board and a housing.

As shown in FIG. 1, the child board 10 is provided with a connector 11 electrically connected to a parent board, which will be described later, and a board 12 on which electrical parts (not shown) are arranged, and is attached to the back side of the board 12. It is composed of a plate-shaped metal plate 13 that corrects a warp that occurs when the electrical components are mounted on the substrate 12. The substrate 12 and the metal plate 13 are connecting means, for example, a plurality of spacers 14 formed of resin and having the same length.
It is designed to be connected and fixed in parallel by.

As shown in FIG. 2, a plurality of slide rails 31 having a conductive shield finger, which constitutes a support member of the child board 10, are arranged on the parent board 20 to which the plurality of child boards 10 are electrically connected. The provided housing 30 is arranged at a predetermined position.

As shown in FIG. 3, a connector electrically connected to a connector 11 provided on a substrate 12 of a child substrate 10 inserted along a slide rail 31 of a housing 30 on a substrate of a parent substrate 20. 21 is provided to face the connector 11.

As shown in FIG. 4, the slide rail 31 is provided with a support portion side 31a to which the metal plate 13 is attached and detached, and a connection portion side 31b to be electrically connected to the grounded housing. In the groove of the support portion side 31a, a shield finger 32 having a leaf-spring-like conductivity is disposed so as to sandwich the metal plate 13 and be electrically connected.
On the other hand, a plurality of claw-shaped finger portions 32a for electrically connecting to the housing 30 are provided on the connection portion side 31b.

In order to improve the warp correction of the substrate 12 and to reduce the thickness of the metal plate 13 to reduce its weight, the metal plate 13 may be bent at its end. . Further, instead of the slide rail 31 having the shield fingers built therein, the entire slide rail may be formed of a conductive member. Further, the housing 30 has conductivity.

The operation of the substrate configured as described above will be described. When connecting the child board 10 to the parent board 20 as shown in FIG.
The metal plate 13 connected and fixed in parallel to the back surface of the housing via a plurality of resin spacers 14 and the support portion of the slide rail 31 incorporating the conductive shield finger electrically connected to the housing 30. The connector 11 provided on the board 12 of the child board 10 is inserted into the side 31a and connected to the connector 21 provided on the parent board 20. At this time, the metal plate 13 of the child board 10 has a slide rail 31 in which conductive shield fingers are incorporated with respect to the grounded housing 30.
Are electrically connected via.

As described above, the metal plate-like plate is provided in parallel on the back surface of the substrate constituting the sub-board through the spacer, and the metal plate is inserted into and removed from the slide rail connected to the case. The sub-board can be easily attached to and detached from.

Further, by supporting the metal plate provided on the sub-board on the slide rail electrically connected to the grounded housing, each sub-board can be shielded by the metal plate so that the radiation can be radiated. The influence of noise can be significantly reduced.

Further, by disposing the plate-shaped metal plate in parallel with the substrate of the child substrate through the spacer, the warp of the substrate generated when the components are mounted is corrected and the metal plate is By attaching / detaching to / from the slide rail, the connector on the parent board and the connector on each board whose warp is corrected by the metal plate can be easily connected.

As shown in FIG. 6, by fixing the substrate 12 and the metal plate 13 constituting the child substrate 10 with metal screws 15, the slide rail 31 electrically connected to the housing 30 is attached. Supporting the child board 10 to support the parent board 20
By electrically connecting to each of the child boards, the influence of the radiation noise generated between the child boards is further reduced, and the signal ground of each child board 10 is changed from the board 12 to the metal screw 1.
It is grounded via 5 → metal plate 13 → slide rail 31 → casing 30. Thereby, the signal ground of each child board 10 is easily and surely grounded, and noise can be surely reduced.

Further, as shown in FIG. 7, a sub chassis 33a forming a rising portion is detachably attached to a chassis 33 electrically connected to the housing 30. That is, a plurality of sub boards 10, 10 ,. ． When attaching and detaching, the sub-chassis 33a attached to the chassis 33 can be removed to easily attach and detach the child board 10 disposed at the bottom of the housing 30. This contributes to downsizing by designing the height of the housing 30 on which the electric board is arranged to be low.

By the way, it has been desired to efficiently dissipate the heat generated from the electric components mounted on the substrate.

Therefore, as shown in FIG. 8, in this embodiment, the electric component 16 requiring heat radiation is arranged on the metal plate side of the substrate 12 which constitutes the child substrate 10. At this time, the electric component 16 is brought into close contact with the metal plate 13 that constitutes the child board 10. Therefore, the heat generated from the electric components 16 arranged on the substrate 12 and requiring heat radiation is quickly radiated to the outside through the metal plate 13.

As described above, by constructing the sub-board by the board on which electric parts are arranged and the metal plate, not only the warp of the board is corrected but also the influence of radiation noise of each sub-board is reduced. By closely contacting the electric component arranged on the substrate to the metal plate, it is possible to provide an electric substrate that also uses heat countermeasures with improved heat dissipation of the electric component.

[Additional Notes] 1. In an electric board in which a plurality of child boards can be electrically and detachably connected to a parent board, the child boards are arranged in parallel with a board on which electric components are arranged and on the back side of the boards. A conductive plate-like member and fixing means for fixing the plate-like member and the substrate in parallel with each other. Both ends of the plate-like member of the sub-board are connected to a grounded housing. An electrical board that is inserted into a supporting member that is flexible and connected to the parent board.

2. 2. The electric board according to appendix 1, wherein the plate member is a metal plate.

3. 2. The electric board according to appendix 1, wherein the support member is a guide rail having shield fingers built therein.

4. 2. The electric board according to appendix 1, wherein the support member is a guide rail formed of a conductive member.

5. 2. The electric board according to appendix 1, wherein the fixing means is a resin spacer.

6. 2. The electric board according to appendix 1, wherein the fixing means is a metal screw.

7. The electric board according to appendix 1, wherein the casing has conductivity.

[0032]

As described above, according to the present invention, the influence of the radiation noise between each child board is reduced, the warp generated on the board at the time of mounting the component is corrected, and the attachment / detachment to / from the support member and the parent member are performed. It is possible to provide an electric substrate that can be easily electrically connected to the substrate.

[Brief description of drawings]

FIG. 1 to FIG. 5 relate to a first embodiment of the present invention,
FIG. 1 is an explanatory diagram showing a schematic configuration of a child board.

FIG. 2 is a perspective view illustrating a configuration of a main board and a housing.

3 is a front view of FIG.

FIG. 4 is a perspective view illustrating a slide rail with built-in shield fingers.

FIG. 5 is a perspective view illustrating a relationship between a child board and a housing.

FIG. 6 is a perspective view illustrating another configuration of the child board.

FIG. 7 is an explanatory diagram showing a configuration of a chassis connected to the housing.

FIG. 8 is a perspective view illustrating a relationship between an electric component arranged on a child board and a metal plate.

[Explanation of symbols]

 10 ... Substrate 12 ... Substrate 13 ... Metal Plate 20 ... Parent Substrate 30 ... Case

Claims (1)

[Claims] 1. An electric board in which a plurality of child boards can be electrically and detachably connected to a parent board, wherein the child board is parallel to a board on which electric components are arranged and a rear side of the board. And a fixing means for fixing the plate-shaped member and the board in parallel with each other. The both ends of the plate-shaped member of the sub-board are connected to a grounded casing. An electric board, which is inserted into a connected supporting member having conductivity and connected to a parent board.