JPH0543318B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a board mounting structure, and in particular, to a board mounting structure that is equipped with a removable board guide and that allows a combination of large circuit boards and small circuit boards to be mounted. It's about structure.

[Conventional technology]

Conventionally, when mounting a circuit board on a fixed board or back panel, a board guide was provided to simplify the work of mounting the circuit board, and the board guide also assisted in fixing the circuit board. It is often a mounted structure. In such a mounting structure, when a large circuit board and a small circuit board are mounted together, for example, as described in JP-A-59-72198, the upper end or lower end of the small circuit board holder In the position corresponding to
A board guide for guiding the small circuit board is fixed to the back panel with rivets, and the mounting structure is such that the circuit board to be mounted is guided and fixed by the board guide. However, with this mounting structure, the board guide is fixedly fixed to the back panel with rivets, so
A large circuit board or a small circuit board cannot be arbitrarily mounted on the same slot provided with a board guide.

[Problem that the invention seeks to solve]

Conventionally, in the board mounting structure in which large circuit boards and small circuit boards are mounted together, the board guide has a fixed structure in which it is fixed with rivets. However, there was a problem in that only a small circuit board was mounted, and a large circuit board could not be mounted on the slot.

In addition, the board guide for small circuit boards is fixed only to the center of the back panel, so if a small circuit board is mounted only on the upper or lower stage, a space will be created in the lower or upper stage, and the heating element will There was a problem in which the flow of cooling air used to cool a certain circuit board was disrupted, making it impossible to cool it effectively.

The present invention has been made to solve the above problems.

An object of the present invention is to provide a removable board guide so that either a large circuit board or a small circuit board can be mounted on the same slot.

Another object of the present invention is to provide a board mounting structure that eliminates the space created when a small circuit board is mounted by providing a removable board guide and does not disturb the flow of air necessary for cooling. .

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means for solving problems]

In order to achieve the above object, in the present invention,
In a board mounting structure in which a large circuit board and a small circuit board are mounted together on a fixed board of a housing, a fastener having a press-fit protrusion and fixed by being soldered to a through hole of a fixed board, and the fastener It has an elongated round hole into which the protrusion is press-fitted, and a stopper to prevent it from coming off, and is removable from the fixed board, and a board guide with a guide groove for the small circuit board to be mounted. The small circuit board is mounted on the fixed board by attaching and fixing the board guide to the fixed board, and fitting the edge of the small circuit board into the guide groove of the board guide.

[Effect]

According to the above means, the fastener has a press-fitting protrusion and is fixed by being soldered to a through hole of the fixing board, an oblong hole into which the protrusion of the fastener is press-fitted, and a stopper for preventing slippage, A board guide is provided that is detachable from the fixed board. The board guide is provided with a guide groove for the small circuit board to be mounted. When mounting a small circuit board on a fixed board, press the protrusion of the fastener into the oblong hole of the board guide, fix it to the housing with the stopper, and support the board guide with the fastener and stopper. Attach and fix to the fixing board of the housing. The edge of the small circuit board to be mounted is fitted into the guide groove of the board guide, and the small circuit board is mounted on the fixed board.

As a result, when mounting a circuit board on the fixed board of the casing, a large circuit board can be mounted as is, and a removable board guide can be fixed to the fixed board of the casing for a small circuit board. To mount a small circuit board by eliminating the slot space created when mounting it using a board guide. Therefore, either a large circuit board or a small circuit board can be mounted on the same slot. In addition, according to such a board mounting structure, since a removable board guide is attached and a small circuit board is mounted, the mounting structure has no empty space even in the slot in which a small circuit board is mounted. Therefore, in an apparatus using this board mounting structure, when cooling air is flowed during operation, cooling is performed effectively without disturbing the flow of the cooling air.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described using the drawings.

In addition, in all the figures for explaining the examples,
Identical elements are given the same reference numerals, and repeated explanations will be omitted.

FIG. 1 is an overall perspective view showing a mounting structure according to an embodiment of the present invention.

In FIG. 1, 1 is a board guide, and 2 is a housing. A semicircular guide 3 is provided on the inner wall of the housing 2. This semicircular guide 3 is a guide when mounting the circuit board or the board guide 1 in the housing 2. A circuit board or board guide 1 slides between semicircular guides 3 and is mounted in a housing 2.
4 is a main circuit board. This main circuit board 4 becomes a fixed board to which the circuit board to be mounted or the board guide 1 is fixed. 5 is a fastener, which has a press-fitting protrusion. The fastener 5 is soldered to the through hole of the main circuit board 4 and fixed on the main circuit board 4. Reference numeral 6 indicates a stopper to prevent the member from coming off. A pull-out prevention stopper 6 is provided on the substrate guide 1. 7 is a frame in the housing 2. A stopper 6 for preventing the board guide 1 from coming off is attached to this frame 7.
are engaged to fix the substrate guide 1. 13 is a small circuit board to be mounted. The board guide 1 is provided with a guide groove 14 that serves as a guide when mounting the small circuit board 13, and is also provided with a plate 16 having an oblong hole 15.
Reference numeral 17 designates a pin that is the center of rotation of the stopper 6 for preventing slippage. Further, 18 is a rear panel, 19 is a plug mounting plate, 20 is a large circuit board, and 21 is a connector provided on the main circuit board. This connector 21 is for each large circuit board 20 and small circuit board 13.

FIG. 2 is a partial sectional view showing the fastener 5 in detail. In Figure 2, 4 is the main circuit board, 5
is a fastener, and 8 is a metal lead embedded in the fastener and fixed integrally. 9
is a through hole provided in the main circuit board 4. A metal lead 8 is inserted into the through hole 9 and soldered to fix the fastener 5 to the main circuit board 4. The upper part of the fastener 5 has a protrusion. The shape of the projection at the center of the upper part of the fastener 5 consists of a rod-like projection 11 having a spring property and having a groove 10, and a tapered bulge 12 around the tip of the rod-like projection 11. The lower part of the fastener 5 has a structure in which a metal lead 8 is embedded integrally.The metal lead 8 is inserted into the through hole 9 of the main circuit board 4 and fixed by soldering, and the fastener 5 is attached to the main circuit board 4. It will be firmly fixed.

FIG. 3 is a sectional view of the mounting structure taken along the negative plane of FIG. 1, showing a state in which a small circuit board is mounted, and FIG. 4 is a sectional view showing a state in which a large circuit board is mounted. FIG. 2 is a cross-sectional view of the mounting structure taken along the - plane in FIG. 1;

Next, the operation of mounting a circuit board in the casing 2 having such a structure will be explained. This will be explained with reference to FIGS. 1 to 4.

When mounting a small circuit board, a board guide is first mounted. The installation of this board guide will be explained with reference to FIG. The board guide 1 slides between two semicircular guides 3 provided on the inner wall of the casing 2, and connects the protrusion of the fastener 5 on the main circuit board 4 mounted on the inner bottom of the casing 2. is press-fitted into the elongated round hole 15 of the plate 16 of the board guide 1, and the board guide 1 and the fastener 5 are fitted together.
At this time, the slip-out prevention stopper 6 provided at one end of the upper part of the board guide 1 is in an upright state as shown by the dashed line, and the board guide 1 is slid between the semicircular guides 3 and entered. let Then, as described above, attach the board guide 1 to the fastener 5.
Once fitted, the next step is to rotate the pull-out prevention stopper 6 of the board guide 1 by 90 degrees as shown by the arrow.
It is locked to the frame 7 of the housing 2. This results in
The board guide 1 is firmly fixed to the main circuit board 4.

On the other hand, a guide groove 14 for guiding the small circuit board 13 is provided at one end of the board guide 1.
Implement 3. In this mounting operation, the edge of the small circuit board 13 is fitted into the guide groove 14, and the small circuit board 13 is slid and mounted. That is, the small circuit board 13
is mounted on the main circuit board 4 by sliding along the guide groove 14 of the board guide 1 and the inner wall of the rear panel 18 of the housing 2. As a result, the small circuit board 13 is mounted in the state shown in FIG.

The rear side of the miniature circuit board 13 is equipped with a plug mounting plate 19 provided for receiving an external interface connector so as to make electrical contact with the rear panel 18.

When mounting the large circuit board 20, the large circuit board 20 is mounted on the main circuit board 4 from above by sliding the semicircular guide 3 of the housing 2 and the inner wall of the rear panel 18. As a result, the large circuit board 20 is mounted in the state shown in FIG. Furthermore, when mounting the large circuit board 20 in the slot in which the small circuit board 13 was mounted, the board guide 1 is first removed. This is done by raising the pull-out prevention stopper 6 of the board guide 1 90 degrees and rotating the frame 7 of the housing 2.
Remove the lock from the fastener 5, and then remove the rod-shaped projection 1 of the fastener 5.
By removing the elongated round hole 15 of the plate 16 that is fitted into the board guide 1, the board guide 1 is extracted from the housing 2. Next, the large circuit board 20 is mounted on the main circuit board 4 from above by sliding the half-edge guide 3 of the housing 2 and the inner wall of the rear panel 18. Note that, like the small circuit board 13, a plug mounting plate 19 is provided on the back side of the large circuit board 20, so that electrical contact with the rear panel 18 can be obtained.

According to such a mounting structure, circuit boards of different sizes can be mounted on the same slot by attaching and detaching the board guide 1, and the small circuit board 13 can be mounted as a dummy board by the board guide 1.
It is possible to prevent a space from being formed between the housing 2 and the frame 7 of the housing 2, and maintain a good shielding and sealing structure, and it is possible to efficiently cool the mounted circuit board. Furthermore, since the fastener 5 is fixed to the main circuit board 4 by soldering to the through hole 9 of the main circuit board 4, there is no need to provide a special unwired area on the main circuit board 4, and high-density mounting is possible. It can be carried out.

The features of the mounting structure of this embodiment can be summarized as follows.

The board guide 1 slides on a semi-inner guide 3 provided on the inner wall of the casing 2, is fitted into a fastener 5 on the main circuit board 4 mounted on the bottom of the casing 2, and The guide 1 is locked to the frame 7 of the casing 2 by a stopper 6 provided at one end of the guide 1 to prevent the guide 1 from coming off, thereby being fixed within the casing 2.

The fastener 5 on the main circuit board 4 mounted on the bottom of the casing 2 is inserted into the through hole 9 of the main circuit board 4 using the metal lead 8 provided on the fastener 5 and fixed by soldering. The springy protrusion provided on the upper part of the fastener 5 is connected to the groove 1
It has a shape in which a bulge 12 is held by a bar-shaped protrusion 11 having a diameter of 0.

The small circuit board 13 is mounted by sliding between the guide groove 14 of the board guide 1 fixed by fitting and locking and the inner wall of the casing 2.

When the board guide 1 is completely mounted on the housing 2, the fastener 5 is inserted into the oblong hole 15 provided in the plate 16.
mated with. A stopper 6 provided at one end of the board guide 1 prevents the plate 1 of the board guide 1 from coming off.
It is locked in the long round hole 15 of 6 with a fixed pin 17, and has a mechanism that can rotate 90 degrees, and when the board guide 1 is mounted on the housing 2, the stopper 6
Rotate it 90 degrees and lock it in case 2.

This allows the board guide to be easily attached and detached, so that circuit boards of any size can be mounted in the same slot. In addition, when a small circuit board is mounted, the board guide acts as a dummy board and isolates and seals the adjacent circuit boards.
Air flow can be efficiently guided to the heating element on the small circuit board, allowing for effective cooling. Further, since the board guide is not screwed or riveted to the main circuit board, there is no need for an unwired area on the main circuit board, and the mounting density can be increased.

Although the present invention has been specifically described above based on Examples, it goes without saying that the present invention is not limited to the above-mentioned Examples, and can be modified in various ways without departing from the gist thereof.

〔Effect of the invention〕

As described above, according to the present invention, a removable board guide is provided for a small circuit board,
The mounting structure for mounting the circuit board has the following effects.

(1) Since a board guide is used, circuit boards of different sizes can be easily mounted in the same slot.

(2) The board guide attachment/detachment mechanism includes a fastener and a stopper to prevent the board from coming off, so the board guide can be easily attached/detached, workability is improved, and assembly man-hours can be reduced.

(3) To make the board guide double as a dummy board,
Cooling air can provide efficient cooling.

(4) Since the through-holes in the main circuit board are used to fix the fasteners, areas on the main circuit board where wiring is prohibited can be eliminated, allowing for high-density mounting.

[Brief explanation of drawings]

1 is an overall perspective view showing a mounting structure according to an embodiment of the present invention, FIG. 2 is a partial sectional view of a fastener portion, and FIG. 3 is a first sectional view showing a state in which a small circuit board is mounted. FIG. 4 is a cross-sectional view of the mounting structure taken along the negative side of FIG. 1, showing a state in which a large circuit board is mounted. In the figure, 1... Board guide, 2... Housing, 3...
Semicircular guide, 4... Main circuit board, 5... Fastener, 6... Fallout prevention stopper, 7... Frame, 8... Metal lead, 9... Through hole, 1
0...Groove portion, 11...Bar-like protrusion, 12...Bulging portion, 13...Small circuit board, 14...Guide groove, 15...Oval hole, 16...Plate, 17...
...pin, 18...rear panel, 19...junction mounting plate, 20...large circuit board, 21...connector.

Claims (1)

[Claims] 1. In a board mounting structure in which a large circuit board and a small circuit board are mounted together on a fixed board of a housing, a fastener having a press-fit protrusion and fixed by being soldered to a through hole of the fixed board; It has an elongated round hole into which the protrusion of the fastener is press-fitted and a stopper to prevent it from coming off, is detachable from the fixed board, and has a board guide with a guide groove for the small circuit board to be mounted, which prevents the fastener from coming off. Board mounting characterized in that the small circuit board is mounted on the fixed board by mounting and fixing the board guide on the fixed board with a stopper, and fitting the edge of the small circuit board into the guide groove of the board guide. structure.