JP2002299858A - Guide rail structure of circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for providing a top plate and a bottom plate, to increase a heat radiating effect, and to enable mounting circuit boards different in size. SOLUTION: A screwed portion 12 is formed on a guide rail having a guide groove 11 for guiding a circuit board 5 and the screwed portion 12 is inserted into a mounting hole 15 made in the back plate 14 of a box 1 and is fastened by a nut 17 to fix the guide rail 10 to the back plate 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a guide rail used for mounting a circuit board on a housing of a general electronic device such as a communication device.

[0002]

2. Description of the Related Art FIG. 14 is a perspective view showing a conventional guide rail structure.

A conventional guide rail structure is composed of a top plate 2 of a housing 1.
The guide rail 4 is mounted in a mounting hole 7 provided in the base plate 3 and the bottom plate 3, and a heat radiation port 6 is provided in the top plate 2 and the bottom plate 3 as a measure against heat generation of the circuit board 5.

[0004]

However, the above-mentioned guide rail structure has the following problems.

The housing 1 requires the top plate 2 having the mounting holes 7 for the guide rails 4 and the bottom plate 3. Even if the heat radiating holes 6 are provided, the aperture ratio of the top plate 2 is small. The heat radiation efficiency is poor, and as a result, the internal temperature rises and the product life (part life) cannot be guaranteed.

[0006] By using the top plate 2 and the bottom plate 3,
Since the heights of the circuit boards 5 having different functions must be uniformly the same, the cost of the circuit boards 5 with poor mounting efficiency increases.

[0007]

According to the present invention, a guide rail having a guide groove for guiding a circuit board is fixed to a rear plate of a housing by screws or the like.

[0008]

FIG. 1 is a perspective view showing a first embodiment of the present invention, in which the same components as those shown in FIG. 14 are denoted by the same reference numerals.

FIG. 2 shows a guide rail according to the first embodiment, wherein (a) is a left side view, (b) is a front view, and (c).
Is a right side view.

As shown in FIG. 2, a thread 12 and a projection 13 are provided at one end of a guide rail 10 having a guide groove 11, and the diameter of the thread 12 is larger than the outer diameter of the guide rail 10. It is one step smaller.

On the other hand, as shown in FIG. 1, a mounting hole 1 for mounting a guide rail 10 is provided on a rear plate 14 of the housing 1.
5 and a positioning hole 16 are provided. The positioning hole 15 is formed at a position where the projection 13 of the guide rail 10 is fitted and the guide groove 11 is oriented so as to sandwich the circuit board 5.

A method of attaching the guide rail 10 to the housing 1 will be described.
Into the mounting holes 15 and then the projections 13 into the positioning holes 16
And finally tightened and fixed with nuts 17 from the back side of the back plate 14 of the housing 1.

Since each guide rail 10 is independent, a plurality of guide rails 10 are fixed to the back plate 14 in this manner.

Thereafter, the circuit board 5 is mounted on the housing 1 in alignment with the guide grooves 11 of the upper and lower guide rails 10.

The guide rail 10 has a columnar shape, but may have a prismatic shape.

FIG. 3 is a perspective view for explaining the heat radiation effect of the first embodiment, and FIG. 4 is a perspective view showing that the first embodiment can be applied to circuit boards having different sizes.

As described above, according to the first embodiment, the following effects can be obtained.

As shown in FIG. 3, the guide rail 10 is attached to the back plate 14 of the housing 1 so that
The aperture ratio of the upper and lower surfaces of the housing 1 increases, and a greater heat radiation effect can be obtained.

Since the conventional top plate and bottom plate are not required, the cost can be reduced.

As shown in FIG. 4, since the mounting holes 15 for the guide rails 10 are individually provided in the housing 1, the guide rails 10 can be mounted according to the sizes of the circuit boards 51 and 52 having different sizes. Becomes

By providing some mounting holes 15 in the housing 1 in advance, circuit boards 51 and 52 having different sizes can be easily replaced by merely changing the mounting position of the guide rail 10.

FIG. 5 is a perspective view showing a second embodiment of the present invention, and FIG. 6 is a sectional view of a guide rail according to the second embodiment.

The second embodiment includes a guide rail 20, a fixing screw 21, a stopper 22, and the like.

Each of the guide rails 20 has an independent cylindrical shape, and has a through hole 23 inside, and a screw portion 24 is provided at one end. Further, similarly to the first embodiment, a guide groove 11 and a protrusion 13 are provided.

The fixing screw 21 has a screw portion 25 at one end and a groove 26 for using a tool at the other end. Although not shown, the stopper 22 is internally threaded to fit the threaded portion 24 of the guide rail 20.

FIG. 7 is a perspective view for explaining the operation of the second embodiment.

A method of attaching the guide rail 20 to the housing 1 will be described. The fixing screw 21 is passed through the fixing screw 21, and the screw portion 25 of the fixing screw 21 is fitted into a mounting hole 27 that is internally threaded. Thus, the plurality of guide rails 20 are fixed to the back plate 14.

Next, the circuit board 5 is mounted, and finally the stopper 22 is fastened and fixed to the screw portion 24 of the guide rail 20. The fixing of the stopper 22 is not limited to screwing, but may be mechanical engagement means or the like.

As described above, according to the second embodiment, the following effects can be obtained in addition to the effects of the first embodiment.

In the first embodiment, the work is performed from the back side of the housing 1. On the other hand, since the guide rail 20 can be attached only by the work from the front side by screwing the fixing screw 21, a large-sized device can be used. In this case, the number of work steps can be reduced.

The provision of the stopper 22 can prevent the circuit board 5 from falling off.

FIG. 8 is a perspective view showing a third embodiment of the present invention, FIG. 9 is a view showing a relationship between a guide rail and a cover, and FIG.
0 is a cross-sectional view of the guide rail, and FIG.
It is A sectional drawing. The guide rail 30 is obtained by removing the stopper 22 and the screw portion 24 for attaching the stopper 22 in the second embodiment, and providing an R portion 31 at the tip as shown in FIG.

On the other hand, a concave portion 33 having an inclined portion 34 is provided on the cover 32 of the housing 1 as shown in the sectional view of FIG.

The guide rail 30 has a guide groove 1.
1, a projection 13 and a through hole 23 are provided.
3, the guide rail 30 is fixed to the back plate 14 by the fixing screw 21 in the same manner as in the second embodiment.

Although not shown in FIG. 8, after the circuit board is mounted on the fixed guide rail 30, the cover 32 is closed with respect to the guide rail 30 attached to the housing 1, and the R in FIG. The portion 31 is the inclined portion 3 of the concave portion 33 in FIG.
As shown in FIG. 9, the leading end of the guide rail 30 is securely accommodated in the recess 33 and fixed.

As described above, according to the third embodiment,
The following effects are obtained in addition to the effects of the second embodiment.

As compared to the second embodiment, the stoppers 22 are provided by using the cover 32 originally required for the housing 1 and providing the recesses 33 to fix the guide rails 30.
And the screw portion 24 can be eliminated, and an effect of cost reduction can be obtained.

In the first and second embodiments, the guide rail is cantilevered to fix one end of the guide rail to the housing 1.
In the third embodiment, since both ends of the guide rail 30 are fixed, it is possible to mount the circuit board in a more stable state, and it can be expected that reliability against vibration such as an earthquake is improved.

The formation of the R portion on the guide rail can be applied to the first embodiment shown in FIGS.
In combination with the provision of the concave portion in the cover, both ends of the guide rail can be fixed stably.

FIG. 12 is a perspective view showing a fourth embodiment of the present invention, showing a guide rail, and FIG. 13 is a perspective view showing a mounted state of a circuit board.

The guide rail 40 is provided with a plurality of guide grooves 41, 42 with respect to the guide rail of the second embodiment, so that a plurality of circuit boards 51, 52, 53, 54 having different sizes as shown in FIG. Can be implemented in various ways.

Even if only the guide rail 40 provided with the plurality of guide grooves 41 and 42 is mounted on the housing 1, the guide rail 40 is provided only at the positions where the circuit boards 52 and 53 are mounted vertically as shown in FIG. The guide rails 20 of the second embodiment may be fixed at other locations.

Further, a plurality of guide grooves 4 are formed in the guide rail.
The provision of 1, 42 can be applied to the guide rails 10, 30 of the first and third embodiments described above.

As described above, according to the fourth embodiment,
In addition to the effects of the first, second, and third embodiments described above, there is an effect that a block building implementation can be realized.

[0045]

As described above, according to the present invention, since the top plate and the bottom plate are not required, the heat radiation effect is large, the cost can be reduced, and it is possible to mount circuit boards of different sizes. effective.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a view showing a guide rail.

FIG. 3 is a view for explaining the heat radiation effect of the first embodiment.

FIG. 4 is a diagram showing an application example of the first embodiment.

FIG. 5 is a perspective view showing a second embodiment of the present invention.

FIG. 6 is a sectional view of a guide rail.

FIG. 7 is a view for explaining the operation of the second embodiment.

FIG. 8 is a perspective view showing a third embodiment of the present invention.

FIG. 9 is a diagram showing a relationship between a guide rail and a cover.

FIG. 10 is a sectional view of a guide rail.

FIG. 11 is a sectional view taken along the line AA in FIG. 8;

FIG. 12 is a perspective view showing a fourth embodiment of the present invention.

FIG. 13 is a diagram showing a mounted state of a circuit board.

FIG. 14 is a perspective view showing a conventional guide rail structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 5, 51, 52, 53, 54 Circuit board 10, 20, 30, 40 Guide rail 11, 41, 42 Guide groove 12, 24, 25 Screw part 13 Projection 14 Back plate 15, 27 Mounting hole 16 Positioning hole 17 Nut 21 Fixing screw 22 Stopper 23 Through hole 31 R part 32 Cover 33 Recess 34 Incline

Claims (9)

[Claims] 1. A screwdriver is provided at one end of a guide rail having a guide groove for guiding a circuit board, and the screw is tightened with a nut through a mounting hole provided in a housing.
A guide rail structure for a circuit board, wherein the guide rail is fixed to a back plate of the housing. 2. A through hole is provided in a guide rail having a guide groove for guiding a circuit board, a fixing screw is passed through the through hole, and the fixing screw is tightened into a threaded mounting hole provided in a housing. A guide rail structure for a circuit board, wherein the guide rail is fixed to a back plate of the housing. 3. The circuit board guide according to claim 2, wherein after mounting the circuit board on the housing, a stopper is fixed to the guide rail to prevent the circuit board from falling off. Rail structure. 4. The guide rail structure for a circuit board according to claim 1, wherein an R portion is provided at a tip of said guide rail. 5. A concave portion is provided at a position corresponding to the guide rail of a cover attached to the entire surface of the housing, and after mounting the circuit board on the housing, the cover is attached to the cover so that the R portion and the concave portion are provided. 5. The guide rail structure for a circuit board according to claim 4, wherein said guide rails are engaged with each other. 6. The guide rail structure for a circuit board according to claim 5, wherein an inclined portion is provided in said concave portion. 7. The guide rail structure for a circuit board according to claim 1, wherein each of said guide rails is independent. 8. The guide rail structure for a circuit board according to claim 7, wherein a plurality of said guide grooves are formed in one said guide rail. 9. A projection is provided at one end of the guide rail,
9. The guide rail structure for a circuit board according to claim 1, wherein the direction of the guide groove is set by fitting the protrusion into a positioning hole provided in the housing.