JP2002094263A - Assembling structure of rigid printed circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an assembling structure of assembling a rigid printed circuit board connected to a plate-like electrical component via a flexible printed circuit board by utilizing the elasticity of an elastic member. SOLUTION: The rigid printed circuit board 20 connected to a liquid crystal panel 10 via the flexible printed circuit board 30 is assembled by fixedly pressing the board 20 on a support surface 52a of the support 52 of a casing 50 via the elastic member 80 via a bottom wall 42 of a facing plate 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid printed wiring board mounting structure.

[0002]

2. Description of the Related Art Conventionally, for example, there is an instrument for a passenger car that employs a configuration in which a liquid crystal panel is connected to a rigid printed wiring board on which a drive circuit is mounted by a flexible printed wiring board.

[0003]

By the way, in the above-mentioned instrument, the liquid crystal panel and the rigid printed wiring board connected via the flexible printed wiring board as described above are separately assembled to an assembly member by screws or the like. Have been.

However, each connection between the liquid crystal panel of the flexible printed wiring board and the rigid printed wiring board is
Usually, since the connection is made by an anisotropic conductive adhesive and soldering, each connection portion is weak in strength. Therefore, as described above, when the liquid crystal panel and the rigid printed wiring board are assembled to the assembling member, the pulling force and the like generated by this assembling are generated between the liquid crystal panel and the flexible printed wiring board and between the rigid printed wiring board and the flexible printed wiring board. And a stress is applied to each of the connection portions.
For this reason, there is a problem in that the connection portions become defective in conduction or peel off from each other.

[0005] In order to cope with the above, the present invention provides a method of assembling a rigid printed wiring board connected to a plate-shaped electric component via a flexible printed wiring board by utilizing the elasticity of an elastic member. It is an object of the present invention to provide an assembled structure.

[0006]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, a plate-like electric component (10) is provided.
The rigid printed wiring board (20) connected to the flexible printed wiring board (30) via the flexible printed wiring board (30) is mounted between the two members (40, 50) together with the plate-like electric component. It is characterized by being assembled by pressing one against the other via an elastic member (80).

As described above, the rigid printed wiring board is fixed in a free state without being fixed by fixing means such as screws simply by pressing the elastic member against the other member. Therefore, even if the connection between the electric component and the rigid printed wiring board via the flexible printed wiring board is weak in terms of strength, the rigid printed wiring board is pressed by one of the two members through the elastic member to the other member as described above. In the fixing process, no tensile force or the like acts between the electric components and the rigid printed wiring board and the flexible printed wiring board, and no stress is applied to the connection portion.

Therefore, the rigid printed wiring board can be immovably mounted on the other member while maintaining a good conduction state without causing poor connection or peeling of the connection portion. .

According to a second aspect of the present invention, in the first aspect, one and the other of the two members are a return plate and a casing of the instrument, and the plate-like electric component is a liquid crystal panel of the instrument. Yes, each connection of rigid printed wiring board and flexible printed wiring board of liquid crystal panel is made by soldering and bonding of anisotropic conductive adhesive,
The rigid printed wiring board extends from the liquid crystal panel together with the flexible printed wiring board, and is assembled to the casing together with the flexible printed wiring board and the liquid crystal panel by a return plate. One of the extension portions (42, 52) of the facing plate and the casing, which extend opposite to each other from the portions (41, 51) opposed to each other via the liquid crystal panel and the flexible printed wiring board, via an elastic member, and the other. It is characterized in that it is assembled to the extension portion by pressing and fixing. With this configuration, the same operation and effect as the first aspect can be achieved in the meter.

[0010] The reference numerals in parentheses of the above means indicate the correspondence with the specific means described in the embodiment described later.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show an example of a passenger car instrument to which the present invention is applied. This instrument includes a liquid crystal panel 10, a rigid printed wiring board 20, and a flexible printed wiring board 30.

The liquid crystal panel 10 has a connection end 11 at one connection end 3 of a flexible printed wiring board 30.
1 are connected by an anisotropic conductive adhesive. Thereby, the electrical connection between the liquid crystal panel 10 and the flexible printed wiring board 30 is ensured.

The rigid printed wiring board 20 is of a double-sided mounting type. The rigid printed wiring board 20 is soldered at its rear connection end 21 to the other connection end 32 of the flexible printed wiring board 30. It is connected. Thereby, the electrical connection between the rigid printed wiring board 20 and the flexible printed wiring board 30 is ensured. Also,
A drive circuit (not shown) for the liquid crystal panel 10 is mounted on the surface of the rigid printed wiring board 20. Note that the rigid printed wiring board 20 is formed by forming a wiring pattern on both surfaces of an insulating resin substrate having rigidity that does not easily bend.

Further, the instrument is provided with an annular dial plate 40,
A casing 50, a plurality of lamps 60 (only one lamp 60 is shown in FIG. 2) and a wiring board 70 are provided.
The liquid crystal panel 10, the rigid printed wiring board 20, and the flexible printed wiring board 30 connected as described above are assembled between the dial plate 40 and the casing 50. Hereinafter, this assembly configuration will be described in detail.

The facing plate 40 is formed by extending a facing portion 40b in an annular shape from a bottom wall 40a, and the bottom wall 40a is formed by inclining a bottom wall portion 41 to a bottom wall portion 42 as shown in FIG. It is formed so as to extend integrally. The bottom wall portion 41
At the opening 41a, it is fixed on the base end opening 51a of the lamp accommodating portion 51 of the casing 50 via the liquid crystal panel 10. Accordingly, the rigid printed wiring board 20
Extends from the liquid crystal panel 10 to the back side of the bottom wall portion 42 together with the flexible printed wiring board 30. In addition,
The liquid crystal panel 10 is exposed on the display surface of the liquid crystal panel 10 through the opening 41a in the facing plate 40.
At the outer peripheral portion thereof, the proximal opening 5 of the lamp accommodating portion 51.
1a is fixed by fastening a plurality of screws. Also,
The lamp accommodating portion 51 extends in a substantially U-shape from the base end opening 51a toward the right side in FIG.

The bottom wall 40a is connected to the rigid printed wiring board 20 by the bottom wall portion 42 through a rectangular parallelepiped elastic member 80 and against the elasticity of the elastic member. Pressed and fixed above. Here, for this pressing and fixing, the bottom wall portion 4 with respect to the bottom wall portion 41 is formed.
2 is slightly larger than the inclination angle of the support surface 52a toward the wiring board 70 with respect to the opening surface of the base end opening 51a of the lamp housing 51. Further, the elastic member 80 is formed of an elastic material having relatively high hardness and compressibility such as urethane or rubber, and the thickness of the elastic member 80 is determined by the thickness of the bottom wall 42 and the support surface 52a. Somewhat larger than the spacing between.

The support portion 52 is integrally formed with an extension plate portion 52b extending in an L-shape as shown in FIG. 2 from a base end opening portion 51a of the lamp accommodating portion 51 of the casing 50. The support portion 52 is formed by forming a support surface 52a parallel to the bottom wall portion 42. The support 52
Is a protruding positioning portion 52c protruding from the support surface 52a.
The positioning portion 52c is inserted into the positioning hole 21 of the rigid printed wiring board 20 to position the rigid printed wiring board 20.

As illustrated in FIG. 2, each of the lamps 60 is accommodated and supported in an extended end opening 51b of the lamp accommodating portion 51.
The light is turned on in 1 and light enters the liquid crystal panel 10 from the back side thereof. Note that the inner peripheral surface of the lamp housing 51 is formed as a reflective surface.

The wiring board 70 is supported by the extending end opening 51b of the lamp accommodating portion 51 together with the lamps 60. The wiring board 70 includes the rigid printed wiring board 20.
And each lamp 60 is electrically connected.

In this embodiment configured as above,
The liquid crystal panel 10, the rigid printed wiring board 20, and the flexible printed wiring board 30 are assembled as follows. First, as described above, the connection between the liquid crystal panel 10 and the flexible printed wiring board 30 by the anisotropic conductive adhesive and the connection between the rigid printed wiring board 20 and the flexible printed wiring board 30 by soldering are performed. .

Thereafter, the liquid crystal panel 10 is moved to the lamp housing 5.
It is placed on the one base end opening 51a. This mounting is performed by connecting the rigid printed wiring board 20 to the flexible printed wiring board 30.
At the same time, it is performed so as to extend to the support surface 52a side of the support portion 52 of the casing 50. Along with this, the rigid printed wiring board 20 is positioned with respect to the support portion 52 by inserting the positioning portion 52c through the positioning hole portion 21 on the support surface 52a.

Next, the liquid crystal panel 10 is immovably fixed to the base end opening portion 51a of the lamp accommodating portion 51 at the outer peripheral portion thereof by fastening a plurality of screws. Thereafter, the dial plate 40 is assembled to the casing 50 via the liquid crystal panel 10, the flexible printed wiring board 30, and the rigid printed wiring board 20 as follows.

That is, the bottom wall 40 a of the dial plate 40 is located on the liquid crystal panel 10 at the bottom wall 41, and the rigid printed wiring board 2 is located at the bottom wall 42 via the elastic member 80.
0 so that the bottom wall 40a is positioned on the liquid crystal panel 10,
It is placed on the flexible printed wiring board 30 and the rigid printed wiring board 20 in a superimposed manner. In such a state, the bottom wall portion 41 is fixed to a proper position of the casing 50 by fastening a plurality of screws. Along with this fixation, the bottom wall portion 42 moves the rigid printed wiring board 20 to the support surface 5 of the support portion 52 of the casing 50 against the elasticity of the elastic member via the elastic member 80.
2a.

Here, as described above, the inclination angle of the bottom wall 42 toward the wiring board 70 with respect to the bottom wall 41 depends on the wiring of the support surface 52a with respect to the opening surface of the base opening 51a of the lamp housing 51. Somewhat larger than the inclination angle to the plate 70 side,
Further, the thickness of the elastic member 80 depends on the bottom wall portion 42 and the support surface 5.
Since the distance between the rigid printed wiring board 20 and the support 2a is slightly larger than the distance between the rigid printed wiring board 20a and the support surface 52a, the rigid printed circuit board 20 is securely fixed on the support surface 52a.

Further, as described above, the rigid printed wiring board 20 is simply placed on the support surface 52a and is merely connected to the flexible printed wiring board 30, and is fixed to the support surface 52a or the like with screws or the like. It remains free without being worn. Therefore, the flexible printed wiring board 30
Even if each connection between the liquid crystal panel 10 and the rigid printed wiring board 20 is weak in strength, as described above, the rigid printed wiring board 20 is placed on the support surface 52a via the elastic member 80 by the bottom wall portion 42. In the process of pressing and fixing, between the liquid crystal panel 10 and the flexible printed wiring board 30 and between the rigid printed wiring board 20 and the flexible printed wiring board 3.
There is no pulling force or the like between zero and no stress is applied to each of the connection parts.

For this reason, the supporting portions 52 of the rigid printed wiring board 20 are maintained while maintaining good continuity without causing the respective connection portions to have poor conduction or peeling off from each other.
In other words, the rigid printed circuit board 20 connected to the liquid crystal panel 10 via the flexible printed circuit board 30 can be immovably fixed between the return plate 40 and the casing 50.

In implementing the present invention, a rigid printed wiring board 20 is connected to a plate-like electric component such as a suitable wiring board instead of the liquid crystal panel 10 via a flexible printed wiring board 30.
In the case where are electrically connected to each other, the same configuration as in the above embodiment may be employed for pressing and fixing the rigid printed wiring board 20. Thereby, the same operation and effect as the above embodiment can be achieved. Therefore, such effects can be achieved by applying the present invention to a configuration in which the rigid printed wiring board 20 is electrically connected to the plate-shaped electric component via the flexible printed wiring board 30 without being limited to the instrument. it can.

In practicing the present invention, an EL panel may be used instead of the liquid crystal panel 10. in this case,
Since the lamp 60 becomes unnecessary, the lamp housing portion 51 of the casing 50 may be used as a fixed portion, and an EL panel may be interposed between the fixed portion and the bottom wall portion 41.

In implementing the present invention, the return plate 4
Instead of 0, the rigid printed wiring board 20 may be pressed and fixed on the support surface 52a via the elastic member 80 by a part of the front panel that closes the opening on the distal end side of the return plate 40.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 in FIG.

[Explanation of symbols]

10 ... liquid crystal panel, 20 ... rigid printed wiring board, 30 ...
Flexible printed wiring board, 40 ... return board, 41,
42: bottom wall part, 50: casing, 51: lamp housing part, 52: support part, 80: elastic member.

Claims (2)

[Claims] 1. A rigid printed wiring board (20) connected to a plate-shaped electric component (10) via a flexible printed wiring board (30) together with the plate-shaped electric component and both members (40, 40).
50) The rigid printed wiring board, wherein the rigid printed wiring board is mounted by pressing one of the two members against the other member via an elastic member (80). Board assembly structure. 2. One and the other of the two members are a return plate and a casing of an instrument, the plate-like electric component is a liquid crystal panel of the instrument, and the rigid printed wiring board and the flexible print of the liquid crystal panel. Each connection with the wiring board is made by soldering and adhesion of an anisotropic conductive adhesive, and the rigid printed wiring board extends from the liquid crystal panel together with the flexible printed wiring board, and the flexible printed wiring board is connected to the flexible printed wiring board. With board and liquid crystal panel,
At this time, the rigid printed wiring board is attached to the casing by the facing plate via the liquid crystal panel and the flexible printed wiring board.
Each extension part (42, 5
2. The rigid printed wiring board assembling structure according to claim 1, wherein one of the two methods is assembled by pressing and fixing to the other extending portion via the elastic member.