JP2799817B2 - Electronic device mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to mounting structure of the electronic device, in particular relates to the implementation structure of the sub-printed circuit board to the main printed circuit board.

[0002]

2. Description of the Related Art There is a case where it is desired to connect an optional circuit to a main circuit as necessary to change the function of the circuit or to add a special function. In such a case, a structure is adopted in which the main circuit is mounted on the main printed board, the optional circuit is mounted on the sub printed board, and the sub printed board is mounted on the main printed board as needed. Figure
5 shows an example of a conventional structure for removably implement sub print board 3 mounted with options circuits on the main printed circuit board 13 mounted with circuit as a main.

The sub printed board 3 is mounted in parallel with the main printed board 13 via the back board 8, and is provided on the back board 8 with a connector 28 for connecting a sub printed board provided at the back edge of the sub printed board 3. The sub-printed board 3 is fitted by mating the receiving connector 29 and the back board connecting connector 27 provided on the back board 8 with a receiving connector not shown in the figure provided on the main printed board 13. Is electrically connected to the main printed board 13. Also, the sub printed board 3 and the back board 8
Is mechanically held by the guide member 1 fixed to the main printed board 13, and the guide member 1 has a back board guide for guiding the back board 8 movably in a direction perpendicular to the plane of the main printed board 13. A groove 9 and a sub-print board guide groove 4 for guiding the sub-print board 3 so as to be movable in a direction perpendicular to the plane of the back board 8 are provided. It is inserted into and pulled out of the guide member 1 from the near side in the figure.

In such a sub-printed board mounting structure, conventionally, a fixed seat 50 is provided on the guide member 1, and the fixed seat 50 is fixed to the main printed board 13 with screws 51, so that the main printed board 13 is mounted on the main printed board 13. The guide member 1 was fixed.

[0005]

[0006]

In the conventional mounting structure of a sub-printed board shown in FIG. 5 , since the guide member 1 is fixed to the main printed board 13 with screws 51, it can be firmly fixed. However, screwing work is required in the mounting process of the sub-printed board, and when the electronic device is assembled and the sub-printed board that becomes an optional circuit is additionally mounted, the mounting work becomes troublesome, and There is a danger that the mounting operation is performed and the printed board is scratched by the tip of the driver to cause a disconnection accident. Also, if there is a wiring pattern on the main printed board at the portion where the fixed seat 50 of the guide member 1 is fixed, the pattern may be cut when the fixed seat 50 is fastened. Therefore, a wiring prohibited area is provided on the main printed board. Therefore, there is a problem that the wiring efficiency is reduced.

The sub-printed board 3 inserted into the guide member 1 is fixed by fixing a front panel 30 fixed to the front edge of the sub-printed board to the guide member 1 with screws or the like. Backboard 8 inserted
Depends only on the mating force between the backboard connecting connector 27 and the receiving connector on the main printed board side. When the sub-printed board 3 is replaced, the mating between the connectors is loosened and the backboard 8 becomes loose. In some cases, the problem arises that the connection between the new sub-printed board and the back board 8 cannot be made well.

[0008]

[0009] The present invention has been made to solve the problems as described above, easy mounting operation to the main printed circuit board sub-printed board, additional particular by sub print board inexperienced worker Even when mounted on a sub-printed board , there is no risk of operation errors or damage to the device, and even a non-experienced person can reliably add or replace the sub-printed board in a short time The task is to obtain a mounting structure.

[0010]

The mounting structure of the sub-printed board of the electronic device according to the present invention is a sub-printed board 3 mounted on a main printed board 13 via a back board 8 in parallel with the main printed board. Guide member 1 for supporting
In the fixing structure on the main printed board described above, a flat U-shaped or rectangular positioning frame 12 is protruded toward the main printed board 13 side on which the guide member 1 is mounted on the back side in the sub-printed board insertion direction. The positioning frame 12 is fitted to the receiving connector 14 for the back board 8 fixed to the main printed board, and the position of the guide member 1 on the main printed board 13 is fixed. It is characterized by doing. Elastic claws 16 projecting inward from a part of the positioning frame 12
The elastic claw 16 can be engaged with the recess 17 formed on the side surface of the receiving connector 14 to fix the position of the guide member 1 in the direction perpendicular to the main printed board 13. The guide member 1 has a back board guide groove 9 for guiding the back board 8 movably in a direction perpendicular to the plane of the main printed board 13, and the back board inserted into the guide groove 9 in the guide member 1. A retaining projection 31 protruding toward the side 8 can be provided. Further, the front side of the guide member 1 in the sub-printing board insertion direction is fixed to the main printed board 13 via a front panel 22 fixed to the front edge of the main printed board 13. Panel 2
2 may be separated from the surface of the main printed circuit board 13.

[0011] The present invention is a mounting structure smell of the structure
Te are formed on the edge of the front panel 22 fixed to the front edge of the main printed circuit board 13 is bent portion 23 is bent inwardly, and holes 24 and 34 provided in the bent portion, the guide member A hook-like projection 21 formed on the front side in the insertion direction of the first sub-printed board 3 toward the main printed board 13 side.
The engagement, the mounting structure sub print board insertion direction front side of the position of the guide member 1, characterized in that the fixed
Thus, the above problem is solved.

The present invention also relates to a mounting structure having the above structure.
Thus , a hook-shaped hole 34 is provided in the bending portion 23 formed by bending the upper edge of the front panel 22 fixed to the front edge of the main printed board 13 inward, so that the guide member 1 is located in front of the sub-printed board insertion direction. A hook-like projection 21 is formed on the side of the guide member 1 so as to project toward the main printed board 13. The front side of the guide member 1 in the sub-printing board insertion direction is fixed by the engagement between the hook-shaped hole 34 and the hook-shaped projection 21. And guide member 1
The mounting structure, characterized in that the elastic claw 16 for urging is provided on the engagement direction between the hook-shaped hole 34 and the hook-shaped projection 21
The above-mentioned problem is solved by the structure.

[0013]

[0014]

In the mounting structure of the sub-printed board having the above-mentioned structure, the screwing work of the guide member 1 onto the main printed board 13 is not required, so that the mounting work is facilitated, and a mistake in the work makes it possible to use the tip of the driver. The risk of damaging the wiring pattern of the main printed board can be avoided. Also, since the guide member 1 is positioned with reference to the backboard receiving connector 14 on the main printed board 13,
Depending on the molding accuracy of the guide member 1 made of a resin molded product, the positional accuracy of the connector fitting portion between the back board 8 and the main printed board 13 and the connector fitting portion between the sub printed board 3 and the back board 8 are determined. Position accuracy can be improved, and there is no room for mounting errors due to the skill of the operator. The structure in which the guide member 1 is fixed by the positioning frame 12 to be fitted to the backboard receiving connector 14 provided on the main printed board 13 and the elastic claws 16 provided on the positioning frame 12 is a contact between the main printed board 13 and the guide member 1. And the front side of the guide member 1 in the sub-printing board insertion direction is connected to the main printed board 1 via the front panel 22.
3, the entire guide member 1 can be fixed in a state of being separated from the surface of the main printed board 13, and there is no possibility that the guide member 1 damages the wiring pattern of the main printed board 13. At the same time, the wiring prohibited area of the main printed board 13 can be minimized.

Further, the guide member 1 is fixed on the front side in the sub-printing board insertion direction by engagement of the hooks 21 of the guide member with the holes 24 and 34 provided in the bending portion 23 of the front panel 22. By adopting a configuration in which the fixing is performed by the positioning frame 12 and the elastic claws 16, the elasticity of the guide member 1, which is a resin molded product, is used to mount the guide member 1 on the main printed board 13 with one touch. To be able to
You.

[0016]

1 and 2 show an embodiment of a mounting structure of a sub-printed board according to the present invention. Guide member 1
Are formed in a plane rectangular frame shape, and guide projections 2 protruding inward are arranged in a zigzag manner inside the side members, and guide grooves 4 for the sub-printed board 3 are provided between these guide projections. Is formed. The member 5 on the near side of the guide member 1 in the sub printed board insertion / removal direction is an insertion port 6 for the sub printed board.
Are shifted downward so as to open.
On the back side of the guide member 1 in the insertion / removal direction of the sub printed board 3,
Guide grooves 9 for backboard 8 by means of longitudinal ribs 7
A member 10 on the back side of the guide member and a back end of the side member extend downward, further extend diagonally downward inside, and have a U-shaped positioning frame 12 provided with a pressing piece 11 at the lower end thereof. Are formed. The positioning frame 12 has such a shape that its inner rectangular area just fits the outer diameter of the backboard receiving connector 14 fixed to the main printed board 13. At the center of the wall surface at the back end of the positioning frame 12, an elastic claw 16 having both sides cut by slits 15 to provide elasticity is provided so as to protrude inside the positioning frame 12. When the positioning frame 12 is fitted to the connector 14, the elastic claw 16 is engaged in a gap 17 formed between the connector 14 and the main printed board 13, so that the positioning frame 12 can be detached upward. It is to prevent.

Hook-shaped projections 21 are provided at the lower end of the side member of the guide member 1 on the near side in the sub-printing board insertion direction, with the lower end protruding outward. On the other hand, the upper edge of the front panel 22 fixed to the front edge of the main printed board 13 is bent inward in a direction parallel to the board surface of the main printed board 13 to form a bending portion 23. A rectangular hole 24 is provided at a position facing the hook-shaped projection 21. Further, a projection 25 is provided at one position on the lower side of the member 5 on the front side of the guide frame, and a hole 26 is provided at a position of the bending portion 23 corresponding to the projection.

The guide member 1 configured as described above is
By inserting the hook-shaped projections 21, 21 into the holes 24, 24, the projections 25 of the near side member are also inserted into the holes 26 at the same time, the front side in the sub-printing board insertion direction is fixed, and the positioning frame 12 is moved to the main printing board. The elastic claw 1 is fitted by pushing into the upper backboard receiving connector 14 and pushing it.
6 is fitted and fixed in the gap 17 between the connector 14 and the main printed board 13. Then, the back board 8 is inserted into the back board guide groove 9 of the fixed guide member, and the connection connector 27 is fitted into the receiving connector 14 of the main printed board.
Is inserted into the guide groove 4 for the sub-printed board, and the connection connector 28 is fitted into the receiving connector 29 for the sub-printed board on the back board 8 to fix the front panel 30 fixed to the front edge of the sub-printed board 3. Is fixed to the guide member 1 with screws or the like, thereby completing the mounting of the sub-printed board 3.

The fixed guide member 1 includes a hook-like projection 21,
21 and holes 24, 24, the upper, lower, left, and right sides of the drawing on the near side in the sub-printing board insertion direction are positioned, and the protrusions 25 are fitted into the holes 26, thereby fixing the position in the front-rear direction of the drawing. Is done. On the back side of the guide member 1 in the sub printed board insertion direction, the positioning frame 12 is fitted in the connector 14 on the main printed board, whereby the position in the front-rear, left and right directions in the figure is fixed. When the elastic claw 16 is in contact with the surface of the board, a gap 17 between the connector 14 and the main printed board 13 is formed.
, The vertical position in the figure is fixed.

In the structure of the first embodiment, no means is provided for preventing the back board 8 from rising when the sub-printed board 3 is removed. However, as shown in FIG. 3, this problem is caused by providing integrally with a backing guide groove 9 provided in the guide member 1 with a retaining projection 31 protruding toward the backboard 8 inserted into the groove. This can be easily prevented by means such as providing a round hole 32 at a position corresponding to the retaining projection 31 of the board 8. The retaining projection 31 may have a claw-like shape that is locked to the upper edge of the backboard 8.

The engagement between the hook-shaped projection 21 of the first embodiment and the hole 24 facing the hook-shaped projection 21 is achieved by providing one of the hook-shaped projections 21 at the tip of a bending piece 33 extending downward. Hook-shaped projection 21a utilizing elastic deformation of 33 parts
Into the hole 24, the hole facing the hook-shaped projection 21 is a hook-shaped hole 34 as shown in FIG.
Insert the hook-shaped projection 21 at the widened portion of the hook-shaped hole 34,
Thereafter, the guide member 1 may be shifted toward the narrow side of the hook-shaped hole 34 so that the hook-shaped protrusion 21 and the hook-shaped hole 34 are engaged. The hook-like projection 21 and the hook-like hole 3 in this case
4 is secured by fitting the positioning frame 12 to the connector 14 on the main printed board, and the elastic claws 16 are attached in the direction of engaging the hook-like projections 21 with the hook-like holes 34. The power is acting.

[0022]

[0023]

According to the structure of the present invention described above,
When mounting the sub-printed board , screwing work is not required.Especially when the sub-printed board is additionally mounted after the completion of the device, the mounting work can be performed quickly and There is an effect that the operation can be performed without causing an operation error. Further, in the mounting structure of the sub-printed board of the present invention, the wiring member on the main printed board is not damaged by the guide member supporting the sub-printed board, and the wiring prohibited area is not formed on the main printed board. The sub-printed circuit board can be mounted without causing a risk of disconnection due to mistakes, and a reliable mounting structure in which the back board is prevented from coming off can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a first embodiment.

FIG. 2 is an enlarged perspective view of a main part of the first embodiment.

FIG. 3 is a perspective view showing a back board retaining structure.

FIG. 4 is a perspective view of a main part of a second embodiment.

FIG. 5 shows an example of a conventional sub-printing board mounting structure.
Perspective view

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide member 3 Sub printed board 8 Back board 9 Guide board 12 Positioning frame 13 Main printed board 14 Receiving connector 16 Elastic claw 17 Clearance 21 Hook-shaped projection 22 Front panel 23 Bending part 31 Retaining projection 35 Hook-shaped hole 36 Metal plate 37 Guide member 38 Hook

Claims (6)

(57) [Claims] 1. A backboard on a main printed board (13)
In the fixing structure of the guide member (1) for supporting the sub-printed board (3) mounted in parallel with the main printed board via (8) on the main printed board, the guide member
A flat U-shaped or rectangular positioning frame (12) is formed on the back side in the sub-printing board insertion direction of (1), in a state of protruding toward the main printed board (13) side on which it is mounted, The positioning frame (12) is fitted to the receiving connector (14) for the back board (8) fixed to the main printed board, and the guide member (1) is positioned on the main printed board (13). A mounting structure of a sub-printed board of an electronic device, characterized by fixing. 2. An elastic claw (16) projecting toward the inside of a part of the positioning frame (12) is provided, and the elastic claw (16) is formed on a side surface of the receiving connector (14). Recess
The main printed board (13) of the guide member (1) engaged with (17)
2. The mounting structure of a sub-printed board of an electronic device according to claim 1, wherein a position in a direction perpendicular to the plane with respect to the plane is fixed. 3. The guide member (1) is connected to the backboard (8).
A backboard guide groove (9) for movably guiding the main board in a direction perpendicular to the plane of the main printed board (13), the backboard () inserted into the guide groove (9) in the guide member (1). 8) The mounting structure for a sub-printed board of an electronic device according to claim 1, wherein a retaining projection (31) protruding toward the side is provided. 4. The front side of the guide member (1) in the sub printed board insertion direction is fixed to the main printed board (13) via a front panel (22) fixed to the front edge of the main printed board (13). The guide member (1) is characterized in that a portion between the positioning frame (12) and a position fixed to the front panel (22) is separated from the surface of the main printed board (13),
A mounting structure for a sub-printed board of the electronic device according to claim 1. 5. An upper edge of a front panel (22) fixed to a front edge of a main printed board (13) is bent inward to form a bending portion (23). Holes (24,3
4) and a hook-like projection (21) projecting toward the main printed board (13) on the front side of the guide member (1) in the insertion direction of the sub-printed board (3), thereby engaging the guide member (1). 5. The mounting structure for a sub-printed board of an electronic device according to claim 4 , wherein a position on the front side in the sub-printed board insertion direction is fixed. 6. A hook-shaped hole (34) is formed in a bent portion (23) formed by bending an upper edge of a front panel (22) fixed to a front edge of a main printed board (13) inward, A hook-like projection (21) protruding toward the main printed board (13) is provided on the front side of the guide member (1) in the sub-print board insertion direction, and is provided in the sub-print board insertion direction of the guide member (1). Is fixed by the engagement between the hook-shaped hole (34) and the hook-shaped projection (21), and the guide member (1) is engaged with the hook-shaped hole (34) and the hook-shaped projection (21). The mounting structure of a sub-printed board of an electronic device according to claim 5 , wherein an elastic claw (16) biasing in a direction is provided.