JPH0536307Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] Regarding the improvement of an assembly structure in which circuit boards are combined and bonded in two tiers and the grounding conductor of one circuit board is fully grounded and attached to the board mounting surface. The purpose of this is to make it possible to easily attach and detach the upper circuit board that is combined and connected to the upper circuit board without the risk of screws coming loose. In a circuit board mounting structure in which one circuit board is mounted in two stacks with an interval, the second circuit board is provided with a round hole, and the second circuit board is rotated to fit into the round hole of the second circuit board. a coupling tool having a locking part; a spacing tube that is loosely fitted into the coupling tool and maintains the spacing; and a first spacer tube that is mounted in two layers by inserting the spacing tube and screwing it onto the coupling tool. Consists of a circuit board.

[Industrial application field]

The present invention relates to an improved assembly structure in which circuit boards are combined and bonded in two layers and the grounding conductor of one circuit board is attached to the board mounting surface with the entire surface grounded.

Two circuit boards are combined and bonded in two layers in advance to form a single module, and the grounding conductor of one circuit board is fully adhered to the board mounting surface of the casing for ground mounting, so that it can only be connected and removed from one side. If this is not possible, move the other (upper) circuit board in one direction (upwards).
There is a demand for a structure that allows for easy attachment and detachment.

[Conventional technology]

9 and 10 show side sectional views of the assembled structure of a conventional circuit machine.

The first circuit board 12 and the second circuit board 13 are connected in advance to form a module before being mounted on the housing 11. The second circuit board 13 is particularly provided with a grounding conductor (not shown) on the side that contacts the board mounting surface 11a of the housing 11.

In the case of FIG. 9, male screws 14 are provided at both ends between the first circuit board 12 and the second circuit board 13.
A rod-shaped spacing member 14 having a diameter of 1.a is inserted, and nuts 14b are fastened from both sides to connect them. This structure is such that nuts 14b are sunk into recesses 11b formed in the board mounting surface 11a of the housing 11, and both circuit boards 12 and 13 are screwed together with mounting screws 16, respectively.

In the case of FIG. 10, both circuit boards 12, 1
A rod-shaped spacing member 15 having a screw hole 15a is inserted between the two, and the two are screwed together from both sides using mounting screws 15b.

This is the recess 1 made in the board mounting surface 11a.
1b by sinking the screw head 15b-1 into both circuit boards 1.
2 and 13 are each screwed together with mounting screws 16.

[Problem that the invention attempts to solve]

However, according to the above structure,
When removing the second upper circuit board mounted on the housing, in the case shown in Figure 9, when the nut is loosened, the spacing material rotates together, loosening the nut that fixed the first circuit board, and then loosening the nut. In the case of Figure 10, when the mounting screws are loosened, the spacing material rotates as well, loosening the mounting screws that fixed the first circuit board, making it difficult to remove the first circuit board, and making it difficult to remove the second circuit board. There was a problem where the spacing material had to be tightened again.

In view of the above-mentioned problems, an object of the present invention is to provide a circuit board assembly structure that allows the upper circuit boards combined and combined in two tiers to be easily attached and detached without fear of loosening screws or the like.

[Means for solving problems]

The above-mentioned problem with the conventional structure is that of a circuit board in which the first circuit board is mounted in two layers with an interval on the second circuit board which is grounded and in close contact with the board mounting surface such as the casing. In the mounting structure, the second circuit board is provided with a circular cut hole, a coupling tool is provided with a rotation locking part that fits into the cut circular hole of the second circuit board, and the coupling tool is loosely fitted into the coupling tool and the gap is fixed. This is solved by comprising a spacer tube that holds the spacer tube, and a first circuit board that is mounted in two layers by inserting the spacer tube and screwing it onto the connector.

[Effect]

Since the rotation locking part of the coupler is engaged with the cut circular hole of the circuit board and prevented from rotating, even if the screw fixing means, such as a mounting screw or nut, is turned, it will not rotate together and only the first circuit board will be rotated. can be easily removed.

〔Example〕

The gist of the present invention will be explained in detail below based on the embodiments shown in the drawings. In addition, in the drawings, the same reference numerals as the conventional one indicate the same parts or parts as the conventional one.

1 and 2 show perspective views of a coupler 1 used in two embodiments of the present invention.

The coupling device 1 of FIG. 1 showing the embodiment of FIG.
1-1 is equipped with a rotation locking part 1-1b having two flat surfaces facing one end of the outer periphery of a rod body part 1-1a, and a screw hole 1-1c in the center.

The length of the rotation locking part 1-1b is made slightly shorter than the plate thickness of the second circuit board, and the length of the coupling tool 1-1 is made long enough to allow mounting screws to be screwed in from both ends as described later. I'll keep it.

FIG. 3 shows a perspective view of the cylindrical spacer tube 2, which is inserted into the outer shape of the rod portion of the connector 1 and used in combination. The length is made equal to the facing distance between both circuit boards 3 and 4, which will be described later.

FIG. 4 shows a plan view of the first circuit board 3 on which electronic components (not shown) are mounted, and shows the hole 3a and the board mounting surface of the casing 11 that are connected to the second circuit board 4 shown in FIG. A hole 3b to be attached to 11a is bored.

FIG. 5 shows a plan view of the second circuit board 4 on which electronic components (not shown) are mounted, and shows the rotation locking portion 1-1b or 1 of the coupling tool 1 that is coupled to the first circuit board 3.
-2b, and a round hole 4a to be fitted to the board mounting surface 11a of the housing 11,
A grounding conductor (not shown) is provided over the entire surface of the casing 11 on the side that is in contact with the board mounting surface 11a. Before mounting the first and second circuit boards 3 and 4 in the housing 11,
The connector 1, ie, 1-1 or 1-2, is used to connect.

FIG. 6 is a side sectional view showing a mounting state using the connector 1-1 of FIG. 1.

First, the rotation locking part 1-1b of the coupler 1-1 is inserted and fitted into the cut circular hole 4a of the second circuit board 4 from the opposite side of the ground plane, and fixed with the mounting screw 1-1d.
The spacer tube 2 is inserted into the rod portion 1-1a, the first circuit boards 3 are stacked in two stages, and the two are connected using the mounting screws 1-1e. Then, with the second circuit board 4 facing downward, the screw heads 1-1d' of the mounting screws 1-1d are sunk into the recesses 11b formed in the board mounting surface 11a of the housing 11, and both circuit boards 3 and 4 are attached. Fix each with mounting screws 5.

A second embodiment of the coupling device 1 of FIG.
-2 is 2 opposite to one end of the outer circumference of the rod portion 1-2a.
A rotation locking portion 1-2b having a flat surface,
Form a collar 1-2c on the other end, and a screw hole 1-2c in the center.
2d. The coupling tool 1-2 is made long enough to allow a mounting screw to be screwed in from one end.

FIG. 7 is a side sectional view showing a mounting state using the connector 1-2 of FIG. 2.

First, the rotation locking part 1-2b of the coupler 1-2 is inserted into the cut circular hole 4a of the second circuit board 4 from the ground plane, and the spacer tube 2 is inserted into the rod part 1-2a. Stack the first circuit boards 3 in two stages and install the mounting screws 1-2e.
Combine by. Then, with the second circuit board 4 facing downward, the collar 1-2c of the coupling tool 1-2 is sunk into the recess 11c of the board mounting surface 11a of the casing 11, and both circuit boards 3 and 4 are attached with the mounting screws 5, respectively. Fix it. The mounting screws 5 can be mounted on the circuit board at required positions other than those shown in the drawings, if necessary.

Note that the above description refers to a mounting structure in which the first circuit board and the second circuit board are stacked at different levels, but for example, as shown in the perspective view of FIG. 8, the lower second circuit board 4- In the case of a mounting structure in which the top and bottom are aligned so that 1 is hardly visible, the first circuit board 3 on the upper side is
By removing only -1, the lower second circuit board 4-1 can be exposed, and the effect is remarkable.

Further, the length of the spacer tube 2 described above can be arbitrarily set according to the mounting interval between both circuit boards. 1st
In the coupler shown in the figure, the spacing tube can be omitted by making the length of the rod portion correspond to the length of the spacing tube.

In addition, in the case of the connector shown in Figure 2, it is necessary to use a spacing tube in order to hold down the second circuit board, but the thickness of the collar is determined by the screw head of the mounting screw used in the connector shown in Figure 1. The depth of the recess can be made shallower by making it as thin as possible than the height of the recess. In addition, the work when combining both circuit boards to form a module is a screw-fastening work from one direction from above, which has the advantage of being excellent in workability.

Furthermore, the rotation locking portion of the coupler described above has two parts.
Although there are two flat surfaces, for example, there may be four flat surfaces.

Furthermore, by using a conductive or insulating material for the connector and the spacer tube, it is possible to easily provide conductive grounding or insulation between the two circuit boards.

According to the present invention, both circuit boards can be modularized into one as before, and workability is improved because the mounting screws do not rotate together even when the mounting screws are turned. The board can be easily removed without worrying about screws coming loose.

[Effect of idea]

As described in detail above, according to the present invention, it is easy to modularize in two layers, and even after mounting, it is easy to connect and separate both circuit boards, and there is no need to remove the second circuit board unnecessarily. It exhibits extremely useful effects in practice, such as being able to serve as ground conduction or insulation between both circuit boards as needed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a coupling device according to the present invention, FIG. 2 is a perspective view of another coupling device according to the present invention, FIG. 3 is a perspective view of a spacer tube according to the present invention, and FIG. 4 is a perspective view of a coupling device according to the present invention. 5 is a plan view of a second circuit board according to the present invention, FIG. 6 is a side sectional view of an embodiment using FIG. 1, and FIG. 7 is a plan view of a second circuit board according to the present invention. FIG. 8 is a perspective view of still another embodiment, FIG. 9 is a side sectional view showing the prior art, and FIG. 10 is another side sectional view showing the prior art. . In the figure, 1, 1-1, 1-2 are connectors, 1
-1a, 1-2a are rod parts, 1-1b, 1-2b
is the rotation locking part, 1-1c is the screw hole, 1-1d is the mounting screw, 1-1d' is the screw head, 1-2c is the collar, 1
-2d is a screw hole, 1-2e is a mounting screw, 2 is a spacer tube, 3 is a first circuit board, 3a and 3b are stupid holes,
4 is a second circuit board, 4a is a round hole, 4b is a hole, 5 is a mounting screw, 11 is a housing, 11a is a board mounting surface, and 11b and 11c are recesses.

Claims (1)

[Claims for Utility Model Registration] A first circuit board 3 is mounted in two stacks with an interval on a second circuit board 4 which is ground-mounted in full contact with a board mounting surface 11a of a casing or the like. The circuit board mounting structure includes: the second circuit board 4 having a circular cut hole 4a for mounting; and a rotation locking portion 1-1b that fits into the circular hole 4a of the second circuit board 4. A coupling tool 1, a spacing tube 2 that loosely fits into the coupling tool 1 and maintains the above-mentioned spacing, and a first spacer tube 2 that is mounted in two layers by inserting the spacing tube 2 and screwing it onto the coupling tool 1. A circuit board mounting structure comprising: a circuit board 3;