JPH0547509Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fixing device for printed circuit boards, and for example, to a device for fixing a plurality of printed circuit boards used in instruments such as vehicle instruments or watches.

[Prior Art] In conventional instruments, when a case houses an instrument body and a plurality of printed circuit boards that drive this instrument body, each of the plurality of printed circuit boards has a conductive path and electrically connected to the instrument body. A plurality of terminals are provided, and each terminal is fixed to the bottom of the case with a screw, and the screw connects each terminal to the flexible printed wiring board that is routed and wired to the back of the case. It is configured to connect to

[Problems to be solved by the invention] In the above conventional technology, a plurality of printed circuit boards housed in a case are provided with a plurality of terminals electrically connected to each conductive path, and each terminal is separately attached to the bottom of the case. Since the printed circuit board and the flexible printed wiring board on the back side of the case were electrically connected by fixing them with screws, the number of assembly steps was increased and the assembly work was troublesome. There was a problem that the number of parts tends to increase.

In addition, Japanese Utility Model Application Publication No. 62-21587 discloses that a plurality of printed boards are positioned in a case-shaped molding table using locking pieces and positioning dowels, and the printed boards are positioned opposite to the circuit joints of each printed board. A printed board connection device that positions and fixes a conductive part in a molding table using a molding table, and screws each printed board to a fixing boss, thereby electrically connecting each printed board through the conductive part. has also been proposed, but this method uses conductive parts to electrically connect multiple printed circuit boards placed inside the molding table. Not only is it not applicable to electrically connecting printed circuit boards, but it also requires that each printed circuit board and conductive part be individually assembled within the molding table, and each positioned printed circuit board must be secured with screws. However, the assembly workability is poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printed circuit board fixing device that is easy to assemble, can reduce the number of parts, and can electrically connect printed circuit boards inside and outside a case.

[Means for Solving the Problems] The present invention electrically connects a plurality of printed circuit boards housed in a case and the conductive paths of each printed circuit board, and connects each printed circuit board to each other. The method includes a terminal that integrates a printed circuit board, and a printed board provided on the outside of the bottom surface of the case, and a flat plate-like mounting part is formed along at least a part of the terminal along the inside of the bottom surface of the case. The printed circuit board fixing device includes a conductive fixing member that fixes the mounting portion to the case and electrically connects the terminal to a printed board provided on the outside of the bottom surface of the case.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 to 3 show a first embodiment of the present invention, in which 1 is a case, and a first printed circuit board 3 is held horizontally at the bottom of the case 1 via a holding part 2. A pointer display type meter body 4 driven by the first printed circuit board is provided on the first printed circuit board 3, and a dial 5 is fixed to the upper part of the meter body 4. A second printed circuit board 6 is provided perpendicularly to the side of the meter body 4, and an alarm device (not shown) built into the meter body 4 is driven by the second printed circuit board 6. It is configured as follows. Reference numeral 7 designates conductive parts 3A and 6A for grounding the conductive circuit patterns provided on the first and second printed circuit boards 3 and 6.
This is a terminal that electrically connects the same terminal, and this terminal 7
One end is fixedly fixed to the conductive part 3A for grounding of the conductive circuit pattern provided on the first printed circuit board 3 with a screw 8, and the other end is fixed to the conductive part 3A for grounding the conductive circuit pattern provided on the second printed circuit board 6. A mounting portion 7A is soldered and fixed to the conductive portion 6A, and a mounting portion 7A is bent so that a portion thereof follows the bottom of the case 1. In this case, the terminal 7 has a locking claw 9 on the other end side, and the locking claw 9 is fixed to the second printed circuit board 6 by soldering in a state of being crimped and fixed. Reference numeral 10 denotes a flexible printed wiring board fixed to the back side of the case 1 by engagement of protrusions 11 and holes 12, and a conductive circuit pattern 13 of the flexible printed wiring board 10 includes an electrical cord wired from a battery (not shown). are connected by a coupler etc. 14 is a screw serving as a conductive fixing member that is inserted from the outside of the flexible printed wiring board 10 on the back side of the case 1 and screwed onto the terminal 7;
The screws 14 fix the first and second printed circuit boards 3 and 6, which are integrated with the terminal 7, to the bottom of the case 1, and connect the terminal 7 to the conductive circuit pattern 13 of the flexible printed wiring board 10. connected. 15 is a terminal electrically connected to a conductive part for each positive side provided on the first and second printed circuit boards 3 and 6, and is connected to the conductive circuit pattern 13 of the flexible printed wiring board 10 by a screw 16. electrically connected. When assembling into the case 1, one end of the terminal 7 is fixed in advance to the first printed circuit board 3 by tightening the screw 8.
The other end is soldered and fixed to the second printed circuit board 6 side, and both the conductive circuit patterns 3A and 6A of the first and second printed circuit boards 3 and 6 are electrically connected by the terminal 7, and the first and second printed circuit boards Boards 3 and 6 are connected to terminal 7
In this way, the first and second printed circuit boards 3 and 6 are integrally connected by the terminals 7 and housed in the case 1, and the mounting portion 7A of the terminals 7 is placed inside the case. 1, the first and second printed circuit boards 3 and 6 are supported by the case 1, and then the screws 14 are inserted from the back side of the case 1 and fixed to the terminals 7, printed circuit board 3,
6 is fixed to the case 1 side via screws 14, and the flexible printed wiring board 1
It is electrically connected to the conductive circuit pattern 13 of No. 0.

In this embodiment, the common conductive parts of the first and second printed circuit boards 3 and 6, for example, the conductive parts 3A and 6A for grounding, are connected to one terminal 7.
The first and second printed circuit boards 3 and 6 are housed in the case 1 in a pre-integrated state, and the first and second printed circuit boards 3 and 6 are supported by the case 1 with the mounting portion 7A of the terminal 7 aligned with the case 1. After that, the terminal 7 is fixed to the case 1 side from the rear side of the rear case 1 with one screw 14, and the conductive circuit pattern 13 of the fixed flexible printed wiring board 10 is electrically connected to the terminal 7. Therefore, the first and second printed circuit boards 3 and 6 are separately installed in the case 1, unlike the conventional
Compared to the case where the terminals provided on each printed circuit board are individually secured with screws, the assembly work is simpler and the number of screws and terminals can be reduced. In addition, the mounting portion 7A of the terminal 7 is placed in the case 1.
Since the first and second printed circuit boards 3 and 6 can be stably supported with respect to the case 1 by following the
The printed circuit boards 3 and 6 do not wobble, and tightening the screws 14 while holding down the first and second printed circuit boards 3 and 6 eliminates the troublesome and efficient tightening of the screws 14. It is also easy to work with.

4 to 6 show a second embodiment of the present invention, and the same parts as those in the above embodiment are given the same reference numerals and explanations of the same parts are omitted. A holding part 2 is attached to the inner bottom of the case 1. A first printed circuit board 3 is provided horizontally through the first printed circuit board 3, and a pointer display type instrument body 4 is provided on this first printed circuit board 3.
A second printed board 6 is vertically provided on the side of the board. Further, on the side of the meter body 4, there is provided a meter body 17 that displays information using a display element such as a liquid crystal display element, an electrochromic display element, or an electroluminescence element.
A third printed circuit board 18 is vertically provided on the side of 7 with a holding portion 19 interposed therebetween. Further, one end of the terminal 7B is fixedly fixed to the conductive part 3A for grounding the conductive circuit pattern of the first printed circuit board 3 with a screw 8, and the other end of the terminal 7B is used for grounding the conductive circuit pattern of the third printed circuit board 18. conductive part 18 as
Fix it to A with screw 8A, and then attach terminal 7B.
is soldered to a conductive part 6A for grounding provided in the conductive circuit pattern of the second printed circuit board 6, and a part of the terminal 7B of the case 1
A mounting portion 7C along the bottom is formed by bending.
On the other hand, on the back side of the case 1, a hard printed board 10 is fixed by engagement between a protrusion 11 and a hole 12.
A is attached, and a screw 14 is inserted from the outside of the printed board 10A and fixed to a suitable position on the mounting portion 7C formed on the terminal 7B. When assembling into the case 1, one end of the terminal 7B is fixed in advance to the side of the first printed circuit board 3 by tightening screws 8, and the appropriate position of the terminal 7B is fixed by soldering to the side of the second printed circuit board 6. The conductive parts 3A, 6A, 18 of each conductive circuit pattern provided on the first, second, and third printed circuit boards 3, 6, 18 are fixed by tightening the other end to the third printed circuit board 18 side with a screw 8A.
A is electrically connected by the terminal 7B, and the first, second, and third printed circuit boards 3, 6, and 18 are integrally connected by the terminal 7B. 2. Third printed circuit board 3,
6 and 18 are housed in the case 1 in an integrated state, and the first and second printed circuit boards 3 and 6 are supported by the case 1 with the mounting portion 7C of the terminal 7B aligned with the case 1. By inserting the screw 14 from the back side of the case 1 and fixing it to the terminal 7B, the terminal 7B, which is integrated with the first, second, and third printed circuit boards 3, 6, and 18, is attached to the case 1 through the screw 14. fixed on the side,
And the conductive circuit pattern 13 of the printed circuit board 10
It is electrically connected to A.

As described above, in this embodiment, common conductive parts of the first, second and third printed circuit boards 3, 6, 18, for example, conductive parts 3A, 6A for grounding,
18A are connected by one terminal 7B and integrated in advance, the mounting portion 7C of the terminal 7B is placed in the case 1.
With the first and second printed circuit boards 3 and 6 stably supported against the case 1 along the
4, the terminal 7B is fastened and fixed to the case 1 side, and the conductive circuit pattern 13A of the printed board 10A and the terminal 7B are electrically connected. 2nd and 3rd
Compared to the case where the printed circuit boards 3, 6, and 18 are housed separately in the case 1 and the terminals provided on each printed circuit board are separately secured with screws, the assembly work is easier, and there are fewer screws and terminals. The number of screws 14 can be reduced, the screws 14 can be tightened efficiently, and the work of tightening the screws 14 is simple. In this embodiment, the terminals connecting between the conductive parts of the second and third printed circuit boards 6 and 18 or between the conductive parts of the first and second printed circuit boards 3 and 6 may be connected by separate terminals. In this case, when separate terminals are electrically connected, they can be electrically connected to the back side of the case using one screw, and when not electrically connected, they can be electrically connected to the back side of the case using two screws.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, the meter body, the number and type of printed circuit boards may be selected as appropriate, and the means for fixing the printed circuit board and the terminals and the structure of the holding portion for the printed circuit board may be selected as appropriate.

[Effects of the invention] This invention electrically connects multiple printed circuit boards housed in a case and the conductive paths of each printed circuit board, and also interconnects each printed circuit board to integrate each printed circuit board. a terminal provided on the outside of the bottom surface of the case; By providing a conductive fixing member that is fixed to the case side and at the same time electrically connects the terminal to the printed board provided on the outside of the bottom of the case, it is easy to assemble multiple printed boards and the number of parts is reduced. It is possible to provide a printed circuit board fixing device that can reduce the amount of noise and electrically connect the printed circuit boards inside and outside the case.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a perspective view, FIG. 2 is a vertical sectional view, FIG. 3 is a perspective view of main parts, and FIGS. 4 to 6 4 shows a second embodiment of the present invention, FIG. 4 is a perspective view, FIG. 5 is a longitudinal sectional view, and FIG. 6 is a perspective view of the main parts. 1... Case, 3, 6, 18... Printed circuit board, 3A, 6A, 18A... Conductive part, 7, 7B...
...Terminal, 7A, 7C...Placement part, 10,10A...
...Printed board, 14...Electroconductive fixing member.

Claims (1)

[Scope of utility model registration request] A plurality of printed circuit boards housed in a case,
a terminal that electrically connects the conductive paths of each printed circuit board and interconnects each printed circuit board to integrate each printed circuit board; and a printed board provided on the outside of the bottom surface of the case; A flat plate-like mounting portion is formed on at least a portion of the terminal along the inside of the bottom surface of the case, and the mounting portion is fixed to the case side, and at the same time, the terminal and a printed board provided on the outside of the bottom surface of the case are connected. 1. A printed circuit board fixing device comprising a conductive fixing member that electrically connects the printed circuit board.