JPH0447616Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mounting structure for attaching a flexible printed wiring board to an instrument case.

[Conventional example]

Conventionally, flexible printed wiring boards, which have electrical circuit wiring made of copper foil or the like on a resin film substrate, are often attached to the outside of the instrument case, and the outer surface of the instrument case has an uneven shape. It also has advantages such as being able to be attached along its uneven shape and being lightweight.

When mounting such a flexible printed wiring board, for example, when wiring is to be done around the convex part of the back of the instrument case, such as the position corresponding to the speedometer, the illumination lamp, the connector part for electrical connection with the outside, etc. It often happens that the flexible printed wiring board protrudes sideways from the back of the case or protrudes into undesirable places such as the hole through which the boss at the rear of the speedometer passes. The configuration was such that the flexible printed wiring board that protruded to the side when detoured was stored in a groove-shaped storage recess provided on the inner wall of the side of the instrument.
It is disclosed in Japanese Patent No. 13969 and can be expected to have good effects.

[Problem that the invention attempts to solve]

However, in this conventional example, the inside of the instrument case becomes narrow, and the width of the groove in the storage recess cannot generally be increased, so it is difficult to insert the flexible printed wiring board into the groove-shaped storage recess while bending it. Another problem is that it takes time. In addition, in order to make the interior of the instrument case more widely available, Japanese Utility Model Application No. 57-128188 discloses that a part of the flexible printed wiring board that protrudes from the back side of the instrument case can be replaced with a rib formed on the side surface of the instrument case. A configuration in which the flexible printed wiring board is bent inward is disclosed, but if the gap for storing the flexible printed wiring board is large, it will spring up due to its self-elastic restoring force and cannot be held securely. Similar to the conventional example, the gap must be made small, which poses a problem in that the installation work tends to be complicated.

[Purpose of invention]

The present invention eliminates external interference by easily attaching parts of the flexible printed wiring board that protrude to areas where the flexible printed wiring board is not desirable, such as the sides of the instrument case or uneven areas on the outer surface of the instrument case. The purpose of the present invention is to provide a mounting structure for a flexible printed wiring board in a meter that can be reliably protected while avoiding the problem.

[Summary of the idea]

The present invention is to raise the flexible printed wiring board protruding from the outside of the instrument case to the side of the mounting surface of the flexible printed wiring board or to an unfavorable location for the flexible printed wiring board, and to integrate it from the outside of the case. The protection is provided by contacting a protruding wall that protrudes from the outside.

〔Example〕

Hereinafter, the present invention will be explained in detail based on examples.

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a plan view of the main part of the back of the instrument case 1, FIG. 2 is an enlarged sectional view taken along line AA in FIG. 1, and FIG. FIG. 3 is an enlarged sectional view taken along the line BB in FIG. 1.

In the figure, 1 is an instrument case made of resin,
A flexible printed wiring board 2 is attached to the outer surface of the case 1, for example, the back surface, and electrical circuit wiring 3 is provided on the flexible printed wiring board 2 to prevent interference with other components. Therefore, a coating material is applied. Reference numeral 4 denotes a projecting wall that integrally projects toward the rear of the case 1 from the edge of the back surface of the case 1.
The upper part of the surface that the flexible printed wiring board 2 comes into contact with protrudes inward in a substantially perpendicular direction, and further forms a substantially U-shaped protective portion 5 that is bent at a substantially right angle toward the case 1 side. . Projecting wall 4
A protective portion 5 is not formed on one end side along the side surface of the case 1, and the connection surface between the back surface of the case 1 and the protruding wall 4 of this portion is a curved surface and serves as a wiring board guide portion 6.

Reference numeral 7 designates a lamp socket, through which an illumination lamp 8 is positioned within the case 1, and the electrical circuit wiring 3 of the wiring board 2 at the position of the lamp socket 7 is coated. First, an electrical connection is made with the lamp socket 7. Also 9 is case 1
The pin 9, which is a pin protruding from the back surface, is press-fitted into a hole provided in the wiring board 2 to fix the wiring board 2.

According to the above configuration, the portion of the wiring board 2 protruding laterally from the back surface of the case 1 is held along the protruding wall 4 to be held on the back surface side of the case 1, and the tip is protected by the protective portion 5. From, wiring board 2
It can also prevent curling up and interference with other members. Furthermore, when placing the wiring board 2 along the protruding wall 4, by pushing the protruding part of the wiring board 2 along the back surface of the case 1 toward the protruding wall 4, a part of this protruding part can be moved along the wiring board guide part 6. It also has the advantage of being curved and rising toward the protection part 5 side, so that the protruding portion of the wiring board 2 can be easily aligned with the protruding wall 4, improving workability.

In the configuration of this embodiment, when the tip of the portion of the wiring board 2 along the protruding wall 4 hits the protective part 5, the wiring board 2 receives a downward force from the protective part 5, that is, the wiring board Due to the self-elastic restoring force of 2, the bent portion of the wiring board 2 tries to approach the plane direction and lifts off from the back surface of the case 1, but the tip is held down by the protective part 5. The state along the protruding wall 4 is maintained, and therefore, even if there are no wiring board fixing members such as pins 9 near the protruding wall 4, the wiring board 2 can be fixed to a certain extent by the protective part 5. It is possible.

Further, in the above embodiment, the portion of the protruding wall 4 that does not have the protective portion 5 is provided at one end side of the protruding wall 4 along the side surface of the case 1, but it may also be provided at both ends of the portion that has the protective portion 5. As shown in the figure, a protruding wall 4 without a protective part 5 may be provided in the middle of the distal end so that the protective part 5 is present at both ends, and further protection can be provided at several places as shown in FIG. Part 5
Even if the configuration is not provided, the same effects as in the above embodiment can be obtained.

FIG. 6 is a cross-sectional view of the main parts of another embodiment of the present invention, in which the flexible printed wiring board is located on the back of the instrument case in an unfavorable location, such as the boss protrusion for connecting the cable of the speedometer. The protruding wiring board is held and protected by a protruding wall.

A projecting wall 4 is provided near the boss 11 of the speedometer 10 on the back surface of the instrument case 1, and stands up integrally from the back surface of the case 1 toward the rear of the case 1. A substantially L-shaped protection portion 5A is formed. Further, the protective portion 5A is not provided at both ends of the protruding wall 4 in the direction in which it becomes wider (the depth direction in the figure), and this protective portion 5
A slope is formed at a connection point between the surface of the protruding wall 4 that does not have A on the side where the wiring board 2 is located and the back surface of the case 1, and serves as a wiring board guide portion 6A.

With the above configuration as well, it is possible to obtain the same effect as in the above embodiment regarding the portion of the back surface of the instrument case 1 where the flexible printed wiring board 2 is not desirable to be located. Further, in this embodiment, the protective portion 5A is formed into a substantially L-shape, but the same effect can be obtained by forming a substantially inverted V-shaped protective portion that projects at an acute angle with the projecting wall 4.

In addition, in the above two embodiments, the protective part has a shape in which the upper part of the protruding wall is bent, but as shown in FIG.
In particular, in this case, the longer protruding portion of the wiring board is placed at the same height as the bent-shaped protruding wall shown in the above two embodiments, and the longer protruding portion is placed on the arc-shaped inner surface of the tip. It has the feature of being able to be stored, held, and protected along side.

Incidentally, the dimensions such as the rising height and width of the protruding wall and the rising direction are to be determined as appropriate, and the present invention is not limited to these. Furthermore, it goes without saying that the present invention can be applied to any instrument as long as a flexible printed wiring board is disposed on the outer surface of the case.

[Effect of idea]

As described above, in a device in which a flexible printed wiring board is disposed along the outer surface of the instrument case, a protruding wall is integrally formed from the outer surface of the instrument case, and a part of the flexible printed wiring board is formed. is raised outward and abuts against the protruding wall, and a protective portion is formed to protrude from at least a portion of the tip side of the surface of the protruding wall that the flexible printed wiring board comes into contact with, and the protective portion is formed on the tip side. The mounting structure of the present invention is characterized in that an inclined wiring board guide part that is continuous with the outer surface of the instrument case is formed on the proximal end side of the protruding wall that is not formed. It is possible to hold and protect the flexible printed wiring board that protrudes from the outside of the instrument case in areas where it is not desirable for the flexible printed wiring board to be located, along the protruding wall, and prevents the flexible printed wiring board from curling up or colliding with other components. In addition to preventing interference, this flexible printed wiring board eliminates the troublesome installation work of pushing the end of the flexible printed wiring board into the storage recess on the outside of the instrument case or into the gap between the case side and the ribs as in conventional cases. The flexible printed wiring board can be well protected and held by simply guiding the printed wiring board through the wiring board guide part and bringing it into contact with the protruding wall, thereby improving work efficiency. It is.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, in which FIG. 1 is a plan view of the main parts seen from the rear of the instrument case, FIG. 2 is an enlarged sectional view taken along line A-A in FIG. The figure is an enlarged sectional view taken along the line BB in FIG. 4 and 5 are plan views of the main parts showing examples of shapes of protruding walls other than those shown in the above embodiment, respectively, and FIG. 6 is a sectional view of the main parts showing another embodiment of the present invention. Yes, 7th
The figure is a sectional view of a main part showing an example of a shape of a protruding wall other than that shown above. 1...Instrument case, 2...Flexible printed wiring board, 3...Electric circuit wiring, 4...Protruding wall,
5, 5A, 5B...Protection section, 6, 6A... Wiring board guide section.

Claims (1)

[Scope of utility model registration request] In a device in which a flexible printed wiring board is disposed along the outer surface of the instrument case, a protruding wall is formed integrally rising from the outer surface of the instrument case, and a part of the flexible printed wiring board is raised outward. of the protruding wall, the protruding wall has a protective portion protruding from at least a part of the front end side of the surface of the protruding wall that comes into contact with the flexible printed wiring board, and the protective portion is not formed on the front end side of the protruding wall. 1. A mounting structure for a flexible printed wiring board in a meter, characterized in that an inclined wiring board guide part continuous with the outer surface of the meter case is formed on the base end side.