JP2867914B2 - Board fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a printed circuit board in a case.

[0002]

2. Description of the Related Art Conventionally, as a structure for fixing a printed circuit board in a case, there is a structure disclosed in Japanese Utility Model Laid-Open Publication No. 3-83983. In this publication, a board fixing portion is set in order to incorporate a printed board in a case. Slits are formed in the board fixing portion in accordance with the number of boards to be stored, and the base ends of the respective printed boards are inserted into these slits. In addition, screw holes are drilled in the board fixing portion so as to communicate with the respective substrates, and screws are inserted from these holes to tighten the corresponding printed circuit boards into the board fixing portions. Thus, the printed circuit board is fixed by the board fixing portion, and is incorporated into the case.

[0003]

However, in the above-mentioned prior art, since a troublesome work of screw fastening is required, the work efficiency is not good. In addition, since a special part for fixing, called a substrate fixing part, is required, a space for mounting the case is required for the case, and there is a problem that it is difficult to reduce the size of the case.

The present invention has been devised in view of the above-mentioned conventional problems, and an object of the present invention is to provide a printed circuit board fixing structure having excellent work efficiency.

[0005]

According to a first aspect of the present invention, there is provided a printed circuit board having an opening for inserting the printed circuit board, and the printed circuit board being incorporated therein. A case, wherein a decorative plate capable of covering the insertion opening has a mounting plate extending toward the inside of the case, and at least one of the mounting plate and the printed circuit board has opposite ends. The slit is formed so that the part can be press-fitted.

According to a second aspect of the present invention, in the first aspect, a lamp and another electric element are assembled in parallel at a position near a connection portion of the printed circuit board with the mounting plate. The other electric element is characterized in that it is partitioned in a state where it is shielded from light by the mounting plate.

[0007] The invention of claim 3 is claim 1 or 2.
In the above description, a first guide portion for guiding insertion of the printed circuit board is formed on an inner wall surface of the case along an insertion direction.

Further, the invention of claim 4 is the invention of claims 1 to
3. The device according to claim 3, wherein a second guide portion for guiding insertion of the mounting plate is formed on an inner wall surface of the case along an insertion direction. .

[0009]

The operation of the first aspect of the invention is as follows. The printed circuit board inserted from the insertion opening of the case is held by being mutually press-fitted by at least one slit of the mounting plate provided on the printed board and a decorative plate covering the insertion opening. You. Therefore, the printed circuit board can be assembled without using screws.

According to the second aspect of the present invention, when the printed circuit board is incorporated in the case, the mounting plate functions as a light-shielding plate, so that even if the lamp is turned on, the light leaks to the other electric element side. There is no.

According to the third aspect of the present invention, when the printed circuit board is incorporated in the case, the printed circuit board is incorporated while being guided by the first guide portion.

According to the fourth aspect of the present invention, when the decorative board is incorporated in the case, the decorative board is incorporated while being guided by the second guide portion.

[0013]

The effects of the present invention are as follows. According to the first aspect of the present invention, since slits are provided for press-fitting each other in at least one of the printed circuit board and the mounting plate of the decorative board, the printed circuit board can be fixed without using screw fastening. Efficiency is increased. Further, since no special member is required for fixing the printed circuit board, there is no need to secure a space for assembling the printed circuit board, and thus the entire case can be set compact.

According to the second aspect of the present invention, since the mounting plate functions as a light-shielding plate, light does not leak to a portion other than a necessary portion. On the contrary, this leads to an increase in luminance at a necessary portion. Things. However, in this case,
It is desirable that the light-shielding plate or the inner surface of the case be processed to reflect light.

According to the third aspect of the present invention, the positioning and insertion guide of the printed circuit board are performed by the first guide portion, so that the printed circuit board can be accurately and smoothly incorporated into the case. .

According to the fourth aspect of the present invention, since the mounting plate can be positioned and guided when the decorative plate is assembled by the second guide portion, the decorative plate can be assembled accurately and smoothly.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a case, which is integrally formed of a synthetic resin material. The case 1 is formed in the shape of a rectangular tube that opens upward in the figure, and this opening is an insertion opening 2 for incorporating a printed circuit board 3.
The inside thereof is set to a depth at which the printed board 3 can be stored without protruding outside.
Further, the entire case 1 is provided with mounting holes S formed in the fixing member B.
Are formed so as to be fittable. Further, the insertion opening 2
A pair of elastic claws 4 are formed vertically on both short sides of the opening edge of the opening. The elastic claws 4 can be bent inward and outward by notches on both sides thereof, and when the case 1 is pushed into the mounting hole of the fixing member (not shown), both elastic claws 4 are fitted into the mounting holes. The case 1 is elastically engaged with the edge of the hole, whereby the case 1 is prevented from coming off. However, although not shown, a plurality of fine ridges for preventing slippage are formed in parallel at the tip of the elastic claw portion 4.

In order to guide the insertion of the printed circuit board 3 on both short sides of the inner wall surface of the case 1, the first
A pair of rail members 6A, 6A are disposed facing each other as guide portions 6, and these are biased to one side on the inner surface of the case 1 (positions biased to the right in FIG. 3).
And protrudes integrally from the inner surface of the case 1. The two rail members 6A, 6A extend from the opening edge of the case 1 to the bottom surface along the depth direction, starting from a position slightly lower than the opening edge, and a groove between them for guiding the insertion of the substrate 3. It is an insertion groove 6B. The entrance side (upper end side) of the insertion groove 6B is widened to a slightly wider groove width to make it easier to receive the printed circuit board 3; The groove width is narrowed so as to be slightly wider than the thickness of the substrate 3.

Further, two locking holes 7 are formed on each of the long sides near the opening edge of the insertion opening 2 at predetermined intervals. Further, on the surface provided with the locking holes 7, a second guide portion 8 for guiding installation of a decorative plate 9 described later is provided on the inner wall surface of the case 1.
Is arranged. The second guide portions 8 are respectively arranged between the locking holes 7 and are engraved along the depth direction and over a predetermined depth range (slightly longer than the length of the mounting plate 10 described later).

On the other hand, a lamp 11 and a push-button type switch 12 for blinking the lamp 11 are arranged on one side of the printed circuit board 3 near the upper edge in the drawing. As described above, the printed circuit board 3 has the first guide portion disposed at a position deviated to one side in the case 1, and the contact between the lamp 11 and the switch 12 when the printed circuit board 3 is assembled in the case 1. The portion is set so as to be located substantially at the center of the case 1 (see FIG. 2). The contact portion of the switch 12 can be opened and closed by a pressing operation of a push button 13 described below.
The upper wiring is connected to a power supply (not shown).

The decorative plate 9 is formed of a synthetic resin material similarly to the case 1, and is formed in such a size that the insertion opening 2 of the case 1 can be closed. Further, a circular light transmitting plate 14 is fitted to the decorative plate 9 at a position corresponding to the lamp 11 so that light from the lamp 11 can be transmitted to the outside. On the other hand, a rectangular opening 15 is formed at a position corresponding to the contact portion of the switch 12, and a push button 13 is mounted here so as to be pressed.

A total of four locking claws 16 hang down from the lower surface of the decorative plate 9 at positions corresponding to the locking holes 7 on the case 1 side. The hooks 16A are formed at the tips of the hooks 16, and each hook 16 elastically engages with the hook hole 7 when the decorative plate 9 is closed in the insertion opening 2.

Further, a mounting plate 10 is hung below the decorative plate 9, and the mounting plate 10 is disposed between the light transmitting plate 14 and the push button 13. The mounting plate 10 has an assembling relationship orthogonal to the printed circuit board 3 when holding the printed circuit board 3, and in this case, the lower edge of the mounting plate 10 is formed to have a length extending slightly below the lamp 11. ing. The mounting plate 10 has a width such that both side edges are fitted into the second guide portion 8 of the case 1, and a slit 17 having a predetermined length is cut from the lower edge along the height direction. It is rare. The slit 17 is formed to be slightly thinner than the thickness of the printed circuit board 3, so that when the slit 17 is pressed into the printed circuit board 3, a holding force that does not easily come off due to a frictional force therebetween is obtained. Have been.

Since the printed circuit board 3 is arranged to be deviated to one side in the case 1, the slit 17 is also arranged at a position deviated to that side. The entrance portion of the slit 17 may be formed to be slightly widened by chamfering or the like, so that the press-fitting operation into the printed circuit board 3 is facilitated.

The first embodiment is configured as described above. An example of an operation of incorporating the printed circuit board 3 into the case 1 will be described. However, the operation can be performed in another operation order instead of the following order.

First, the lower end of the printed circuit board 3 is
Into the first guide part 6 of the first embodiment. In this case, the printed circuit board 3 is inserted into the wide entrance portion of the first guide portion 6, guided by the tapered surface thereof, and guided to the insertion groove 6B. For this reason, the insertion position of the printed circuit board 3 into the case 1 is defined, and since the insertion operation is guided, the operation is performed smoothly.
Thus, when the printed board 3 is inserted up to the end of the insertion groove 6B, the lamp 11 and the switch 12 are located substantially on the central axis of the case 1 as shown in FIG.

Next, the lower edge of the mounting plate 10 of the decorative plate 9 is
When it is pushed in by fitting to the upper end of the guide portion 8, the lower end of the slit 17 matches the upper edge of the printed circuit board 3. Then, when the decorative board 9 is pushed as it is, the slit 1
As described above, since the width of the printed circuit board 7 is set to be smaller than the thickness of the printed circuit board 3, the slit 17 sandwiches the printed circuit board 3 while forcibly expanding. That is, the printed circuit board 3 is sandwiched by the restoring force at this time, and is easily held in an integrated state with no detachment or displacement.
When the printed circuit board 3 is inserted to the end of the slit 17 in this way, the decorative plate 9 closes the insertion opening 2 of the case 1 and the hooks 16A of the locking claws 16 are elastically engaged with the corresponding locking holes 7. Then, the decorative plate 9 is fixed to the case 1.

When the printed circuit board 3 is assembled in the case 1 as described above, the entire case 1 is pressed into the mounting hole of the fixing member. Then, the two elastic claws 4 are elastically engaged with the edge of the mounting hole, whereby the entire case 1 is mounted in a state where it is prevented from coming off. As described above, according to the fixing structure of the first embodiment, the slit 1 formed in the mounting plate 10
The printed circuit board 3 can be sandwiched by using the fixing member 7, and the printed circuit board 3 can be fixed without using a conventional screw. Therefore, a reduction in working time can be expected, and a space for accommodating a special member for fixing the printed circuit board 3 in the case 1 does not need to be secured, so that the case 1 itself can be made compact. Further, since the first and second guide portions 8 guide the insertion operation of the printed circuit board 3 and the decorative board 9, the operability at the time of assembling is excellent.

Furthermore, since the mounting plate 10 partitions the lamp 11 and the switch 12 in the case 1,
Even when the contact portion is pressed by the pressing operation of the push button 13 and the lamp 11 is turned on, the irradiation light is transmitted only from the light transmitting plate 14 and leaks from other places, that is, the periphery of the push button 13 through the opening 15. Nothing. That is, since the mounting plate 10 reliably blocks the irradiation light from the lamp 11 and regulates leakage from other locations, light transmission is realized only from the portion where light is to be transmitted. In the case where a process for reflecting the light on the inner surface of the optical disk 1 such as a reflective tape or a color is performed, the visibility can be improved by increasing the luminance.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the slit 1 is opposite to the first embodiment.
7 is provided on the printed circuit board 3 side. Also in this case, the relative assembling relationship is the same, and the same operation and effect as in the first embodiment can be obtained. However, in the first embodiment, the slit 17 is not provided on the printed circuit board 3,
The degree of freedom in wiring on the substrate 3 is increased. However, if a sufficient wiring space is secured on the printed circuit board 3, the second embodiment is also effective. However,
Such a slit 17 is provided on the printed circuit board 3 and the mounting plate 10.
May be provided in both. If you do this,
The mounting plate 10 can be formed low, and the material can be reduced.

In the second embodiment, the first guide portion 6 for the printed circuit board 3 is omitted, and the mounting plate 10
The second guide portion 8 is also formed as a cut groove for communicating the inside and the outside of the case 1 so that both side edges of the mounting plate 10 are pressed into the entire length thereof (the mounting plate 1).
A protruding portion may be formed on the base side of 0, and only this portion may be press-fitted. Such a second guide portion 8 can also guide the assembly of the decorative board 9.

Incidentally, contrary to the second embodiment, the second guide portion 8 may be omitted and only the first guide portion 6 may be formed. Also in this case, it may be a kerf-shaped one communicating between the inside and the outside as in the second embodiment. However, other configurations are the same as in the first embodiment.

The present invention can be variously modified,
The following modifications are also included in the technical scope of the present invention.

The method of fixing the case 1 to the decorative plate 9 is not limited to the embodiment, but may be, for example, a screwing method.

In the embodiment, the mounting plate 10 also serves as a light-shielding plate, so that the arrangement space is made more efficient. However, if there is no such requirement, a mounting-only plate and a light-shielding-only plate are used. May be separately formed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a fixing structure according to a first embodiment.

FIG. 2 is a cross-sectional plan view showing an assembled state in a case.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a side sectional view showing a fixing state of a case to a body.

FIG. 5 is an exploded perspective view showing a fixing structure according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 2 ... Insertion opening 3 ... Printed circuit board 6 ... 1st guide part 8 ... 2nd guide part 9 ... Decorative board 10 ... Mounting plate 11 ... Lamp 12 ... Switch 17 ... Slit

Claims (4)

(57) [Claims] 1. A decorative board comprising: a printed board; and a case having an opening for inserting the printed board and into which the printed board can be incorporated. The mounting plate extends inward, and at least one of the mounting plate and the printed circuit board is formed with a slit into which mutually opposite ends can be press-fitted. Construction. 2. The lamp according to claim 1, wherein a lamp and another electric element are assembled in parallel at a position near a connection portion of the printed circuit board with the mounting plate, and the lamp and the other electric element are connected to each other. A substrate fixing structure, wherein the substrate is partitioned while being shielded from light by the mounting plate. 3. The method according to claim 1, wherein
A board fixing structure, wherein a first guide portion for guiding insertion of the printed board is formed on an inner wall surface of the case along an insertion direction. 4. A case according to claim 1, wherein a second guide portion for guiding insertion of said mounting plate is formed on an inner wall surface of said case along an insertion direction. A substrate fixing structure.