JPH0590727A - Structure for mounting subsidiary printed circuit board for main printed circuit board - Google Patents

Abstract

PURPOSE:To enable only a subsidiary printed circuit board to be removed easily by fixing a guide member to a main printed circuit board and at the same time a subsidiary printed circuit board to be fitted to the guide member so that it can be slid easily. CONSTITUTION:A number of main printed circuit board 10 where a number of electronic parts 11 are mounted are arranged within an enclosure of a plug-in package in parallel and are connected to a connector at a side of an equipment main body by a connector 12 which is located at a deep edge of each main printed circuit board 10 so that they can be mounted or removed freely. A connector 14 for connecting the subsidiary printed circuit board is placed at a central part of a front edge of the main printed circuit board 10 and at the same time guide numbers 15, 15 which guide a subsidiary printed circuit board 16 are fixed in parallel at upper and lower positions of the front edge, respectively. The subsidiary printed circuit board 16 has a connector 17 for making connection to the connector 14 so that it can be mounted and removed freely at a deep edge and at the same time parts which need to be inspected, adjusted, operated, and replaced frequently are mounted on this printed circuit board, thus enabling only the subsidiary printed circuit board to be removed easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug-in unit to be mounted on electronic equipment such as communication equipment and office automation equipment. More specifically, it is a sub-board mounting structure for improving the mounting density of electronic components on a printed board. Regarding the improvement of.

[0002]

2. Description of the Related Art In many electronic devices such as communication devices and office automation devices, a plug-in package that houses a printed circuit board is configured to be detachable from the device.

The plug-in package is a hybrid I
It is equipped with a large number of printed circuit boards on which various electronic parts such as C and ASIC are mounted. However, as the demand for high-density mounting increases from the user side, various parts are provided to meet this request. The mounted sub-board is detachably mounted on the main printed board. The sub board is generally equipped with parts that require inspection such as relay switches and adjustment parts, or parts that need replacement when changing the function or specifications of the equipment according to the user's request, and remove only the sub board It is desirable that only these parts can be inspected, adjusted and replaced.

FIG. 3 is an explanatory view of the structure of a printed circuit board provided with a sub-board which has been generally used in the past, in which the sub-board 2 is mounted in parallel on the main board 1 with a predetermined space therebetween. In the sub-board 2, the support 3 or the bracket 4 and the like are fixed on the main board 1 by using fixing means such as screws 5.

However, in such a conventional sub-board mounting structure, the sub-board is fixed by using a fixing means such as a screw, so that the attachment / detachment work is not easy and therefore the sub-board is mounted. When performing inspection, adjustment, operation, or replacement of parts, it is necessary to remove the entire main board with the sub-board attached from the mounting part of the device body, and then remount it on the original part after the work is completed. Because there was
There was a limit in reducing the work time and efficiency.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide a sub-board mounting structure which can be easily attached to and detached from a printed board.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, a mounting structure for a sub-board according to the present invention has at least a pair of guide members for slidably supporting the sub-board fixed to the main board, and the pair of guide members. Each have a mounting portion for fixing them to the edge of the main board, and a guide rail portion extending from the mounting portion. A guide groove is formed along each of the guide rail portions, and each of them has a guide groove. The upper and lower edges of the sub-board are slidably fitted together.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 is a perspective view showing a sub-board mounting structure according to an embodiment of the present invention. A main printed circuit board (main board) 10 on which a large number of electronic components 11 are mounted is a casing of a plug-in package (not shown). Many connectors 12 are arranged in parallel in the body and are located at the innermost edge of each main board 10.
Is detachably connected to the connector on the device body (not shown) side. A connector 14 for connecting a sub-board is arranged at the center of the front edge of the main board 10, and guide members 15, 15 for detachably guiding the sub-board are fixed in parallel at the upper and lower positions of the front edge.

The sub-board 16 has a connector 17 which is detachably connected to the connector 14 at the inner edge thereof, and on which a component frequently inspected, adjusted, operated and replaced is mounted.

The guide members 15 and 15 each include a mounting portion 19 fixed to the front end edge of the main board 10 by a tapping screw 18 and a guide rail portion 20 integrally extending from the mounting portion 19. A pair of guide members 1
The guide rail portions 20 and 20 of 5 and 15 have guide grooves 20a and 20a along the opposite edges thereof, and also have ridges 20b and 20b over the entire length of the guide groove 20a on the opposite side. The guide grooves 20a and 20b have a shape suitable for slidably supporting the opposite edges of the sub-board 16 in a fitted state, and the ridges 20b and 20b are opposite edges of the main board 10. The protrusion length and width are set so as to continuously extend in a stepless manner. In addition, it is advantageous in terms of moldability and cost that the guide members 15 and 15 are made of resin. It goes without saying that the mounting direction of the guide member 15 is parallel to the mounting directions of the main board and the sub-board.

In addition to the method described above, the mounting portion 19 may be mounted by inserting the projection provided on the back surface of the mounting portion 19 into a hole provided in the main board 10 and then caulking the tip of the projection by heat melting. The recess provided on the substrate side and the protrusion may be integrated by ultrasonic welding or the like.

As is apparent from the above description, the operation of connecting the sub-board 16 to the main board 10 is performed by inserting the sub-board 16 along the guide grooves 20a, 20a of the upper and lower guide members 15, 15, and by inserting the connector. All that is required is to connect 17 and the connector 14. When removing the sub-board 16, it is sufficient to simply pull it out. The board mounted on the machine body will not fall off from the machine body because its front edge is held down by the front plate (not shown) of the plug-in package. Then, the main board 10 and the sub-board 16 joined together becomes detachable in the plug-in package as a whole, and if necessary, the sub-board alone can be easily attached and detached without using a special tool. .. Moreover, by removing only the sub-board, each electronic component on the main board can be held in a live state.

FIG. 2 shows another embodiment of the present invention, which is characterized in that a plurality of sub-boards 16 can be attached to and detached from one main board 10 by using the guide member 15 described above. The structure of the individual guide members 15 is the same as that of the first embodiment, but by using the guide members 15 in combination as shown in the drawing, each electronic component on the main board can be kept hot. It is possible to individually attach and detach a large number of sub-boards.

By attaching the guide member 15 of the present invention to the conventional sub-board 2 or the sub-board supporting frame shown in FIG. 3, another sub-board can be attached to the sub-board 2 or the supporting frame. You may attach it detachably.

[0016]

As described above, according to the present invention, since the guide member is fixed to the main board and the sub-board is slidably mounted on the guide member, only the sub-board can be removed. This facilitates the inspection, adjustment, replacement, and operation of the parts on the sub-board, or the workability of replacing the sub-board itself.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a configuration of a conventional example.

[Explanation of symbols]

10 ... Main substrate, 11 ... Electronic components, 12 ...
・ Connector, 14 ... Connector, 15 ... Guide member, 16 ... Sub-board, 17 ... Connector, 19 ...
・ Mounting part, 20 ... Guide rail part, 20a ...
Guide groove, 20b ...

Claims (1)

[Claims] 1. A main board mounted on a main body of a device, a sub-board detachably mounted on the main board, and at least a pair of guide members fixed to the main board and slidably supporting the sub-board. Each of the guide members includes an attachment portion fixed to one end edge of the main board and a guide rail portion extending from the attachment portion, and a guide groove formed in the guide rail portion in the longitudinal direction. An attachment structure for a sub-board to a main board, wherein an upper edge or a lower edge of the sub-board is slidably fitted and supported.