JPH0249754Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a structure for fixing a plurality of substrates used in liquid crystal display devices and the like.

[Conventional technology]

In recent years, it has been used as a display device for vehicle instruments such as automobiles and motorcycles, controlling the transmission or non-transmission of light by changing the arrangement of liquid crystal molecules when voltage is applied, and displaying symbols such as predetermined letters and numbers according to the electrode shape. This type of liquid crystal display device is disclosed in, for example, Utility Model Application No. 58-21115 and Utility Model Application Publication No. 58-21115.
It is disclosed in the publications No. 28823 and No. 59-14393.

That is, as shown in FIG. 5, in the conventional liquid crystal display device 1, a light guide 2 for a surface light source made of a light-guiding resin material is used as a reference part during assembly work, and a semi-transparent light guide 2 is provided in front of the light guide 2. A liquid crystal element 4 is disposed through a reflector 3, and a reflector 5 is disposed behind the light guide 2, and electronic components 6 and other components for applying a signal voltage to the liquid crystal element 4 are disposed behind the reflector 5. Connector 7
A plurality of circuit boards 8, 9, and 10 constituting a drive circuit consisting of etc. are arranged, and furthermore, electrodes of the liquid crystal element 4 (not shown) and electrodes of the circuit board 8 (not shown) are arranged.
A conductive rubber 11 for electrically connecting the two is disposed in the front and back direction, and the liquid crystal element 4 is held from the front via a rubber gasket 13 by a holding member 12 made of a metal material and secured to the light guide 2. The plurality of circuit boards 8, 9, and 10 are fixed in a stacked manner by screws 15 to a mounting leg member 14 made of a metal material, and are also fixed to the rear surface of the light guide 2. Note that each circuit board 8 , 9 , 10 is connected by a wiring cord 16 .

[Problem that the invention attempts to solve]

In the configuration of the liquid crystal display device 1, the first circuit board 8 is positioned and brought into contact with the rear surface of the light guide 2, and the mounting leg member 1 is installed behind the first circuit board 8.
Position and abut the stepped mounting portion 14a at the front of 4, and attach the mounting leg member 14 and the circuit board 8 with screws 15.
and the light guide 2 are integrally fixed.

Next, the second circuit board 9 is fixed to the intermediate stepped mounting portion 14b of the mounting leg member 14 with screws 15.

Then, the third circuit board 10 is attached to the mounting leg member 14.
Since it is fixed to the stepped mounting portion 14c at the rear of the circuit board, not only a large number of screws 15 are used, but also a large number of man-hours are required for tightening the screws. Leg member 14
The stepped mounting portions 14a, 14b, 14c cannot be made large in order to secure a wide area for arranging the electronic components 6, etc. on the circuit boards 8, 9, 10, and therefore, it is difficult to properly hold the circuit boards 8, 9, 10. Moreover, since the plurality of circuit boards 8, 9, and 10 are assembled in a stacked state, the height of the mounting leg member 14 becomes high, and it is difficult to obtain sufficient stability.

Furthermore, the circuit boards 9 and 10 are attached to the mounting leg members 14 in advance.
In the case where the mounting leg member 14 is fixed to the rear surface of the light guide 2 together with the circuit board 8 after the mounting leg member 1 is set to
Even after fixing to the mounting leg member 14 and the circuit board 8
The circuit boards 9 and 10 must be made smaller or a portion thereof must be cut out so that the screws 15 that fix the light guide 2 to the light guide 2 can be tightened. This has the problem of reducing the amount of

[Purpose of invention]

This idea was devised by focusing on the problems of the conventional example, and reduces the number of man-hours for tightening screws.
Furthermore, it is an object of the present invention to provide a substrate fixing structure that can increase the area of the substrate.

[Summary of the idea]

In order to achieve the above object, this invention provides a substrate fixing structure in which a plurality of substrates are fixed to a predetermined location in a stacked state. a hollow columnar collar made of resin; at least one claw provided on each side of the collar; a hole formed in the two substrates to be hooked to the outer surface of each of the two substrates through the claw; A mounting leg member for fixing a board other than the two boards to a predetermined location, and a mounting leg member that is inserted from the outer surface of one of the two boards to the outer surface of the other board through the hollow part of the collar. , and a screw threadably engaged with the mounting leg member.

[Example of idea]

Figures 1 to 3 show a liquid crystal display device to which an embodiment of this invention is applied, and the same or equivalent parts as in the conventional example shown in Figure 1 are given the same reference numerals, and the details thereof are shown. I will omit the explanation.

Three circuit boards 8, 9, 10 of the liquid crystal display device 1
Of these, the second circuit board 9 and the third circuit board 10 have a collar 17 disposed between their opposing inner surfaces.
In other words, the collar 17, which is formed into a substantially hollow cylindrical shape from a resin material, has a plurality of claws 17a on both end surfaces, and these claws 17a are used to connect the second circuit board 9 and the third circuit board. hole 9a of circuit board 10,
By inserting it into 10a, both circuit boards 9, 1
0 can be hooked onto the outer surface of the circuit board 9,
10 are connected and installed in parallel. The first circuit board 8 is formed of a metal material and has a substantially U-shape.
Step mounting portion 1 at the rear of the mounting leg member 14 that contacts the rear surface and is fixed to the rear surface of the light guide 2 with screws.
4c is provided with a female screw 14d, which allows the circuit boards 9 and 10 in a state in which the parts are integrally connected, that is, in a temporarily fastened state, to abut against the rear surface of the stepped mounting portion 14c of the mounting leg member 14, and to screw the circuit boards 9 and 10 from behind. The second circuit board 9 and the third circuit board 10 are connected to the first circuit board by passing the long screw 18 through the hollow part 17b of the collar 17 and screwingly engaging it with the female screw 14d of the stepped mounting part 14c. 8 are fixed in a stacked state at the rear.

In addition, as shown in FIG. 4, the collar 17 is designed to relieve stress when tightening the long screw 18.
A reinforcing pipe 19 made of, for example, a metal material may be inserted into the hollow portion 17b of the collar 17.

Further, the shape of the collar 17 is not limited to the above-mentioned substantially cylindrical shape, but may be a hollow columnar shape, and the number of claws 17a may be at least one on each side of the collar 17 to temporarily fix the circuit boards 9 and 10. It is something.

[Effect of idea]

This invention is based on a substrate fixing structure in which a plurality of substrates are fixed in a stacked state at a predetermined location. , at least one claw provided on each side of the collar, a hole formed in the two substrates through which the claw is hooked to the outer surface of each of the two substrates, and a substrate other than the two substrates. a mounting leg member for fixing to a predetermined location; and a mounting leg member that is inserted from the outer surface of one of the two boards through the hollow part of the collar to the outer surface of the other board; This design is equipped with screws that engage with each other by threading, so the number of screws and the number of screw tightening steps are reduced compared to conventional structures.Furthermore, the circuit boards can be easily joined using a collar, and this temporary fixing method Since it is fixed at a predetermined location after being fixed, there is no need to position each individual board, thereby simplifying the work of fixing the boards.

Furthermore, since the board is fixed with the collar and screws, the stability when fixing the board is improved.

Furthermore, since multiple boards can be fixed on approximately the same axis, there is no need to reduce the size or cut out a part of the board located at the rear in order to fix the board located at the front. It has extremely great practical value as it has the effect of increasing the area.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a main part of a liquid crystal display device to which an embodiment of this invention is applied, Fig. 2 is an enlarged cross-sectional view of a main part of the same liquid crystal display device, and Fig. 3 is a perspective view of the color shown in Fig. 2. , FIG. 4 is a sectional view of another color to which the same color is applied, and FIG. 5 is a sectional view of a main part of a conventional liquid crystal display device. 8, 9, 10...Circuit board, 9a, 10a...
Hole, 14...Mounting leg member, 17...Color, 17
a...Claw, 17b...Hollow part, 18...Long screw, 19...Pipe.

Claims (1)

[Scope of utility model registration request] A substrate fixing structure for fixing a plurality of substrates in a stacked state to a predetermined location includes: a resin hollow columnar collar disposed between opposing inner surfaces of two of the plurality of substrates; At least one claw is provided on both sides, and the above-mentioned two are passed through this claw.
a hole formed in the two substrates that is hooked onto the outer surface of each of the two substrates; a mounting leg member that fixes a substrate other than the two substrates to a predetermined location; and one of the two substrates. A board fixing structure, characterized in that a screw is provided which is inserted from the outer surface of the board through the hollow part of the collar to the outer surface of the other board, and is threadedly engaged with the mounting leg member.