JPH0316305Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a mounting structure for fixing a printed wiring film to an instrument case of an automobile or the like.

[Conventional technology]

Generally, inside the instrument case, there are instruments that indicate the driving status of the vehicle, such as a speedometer with a speed alarm function, an engine tachometer, a fuel gauge, a temperature gauge, etc., the oil pressure status, the opening/closing status of the doors, the operating status of the handbrake, etc. A central warning device that centrally displays various vehicle statuses such as the upward lighting status of the headlights, and night illumination lamps for each of the above-mentioned instruments are housed and fixed, and the above-mentioned electric instruments and central warning device are displayed. Electrical power is supplied to equipment or lighting lamps from the vehicle's battery via electric cables. In this case, a printed wiring board with a predetermined conductive circuit pattern is attached to the back of the instrument case and connected to the electric cable. It is electrically connected to a printed circuit board, and then connected from the printed circuit board to each of the electric meters, display devices, and lighting devices such as lamps.

By the way, as disclosed in, for example, Japanese Utility Model Application Publication No. 135-475 and Japanese Patent Application Publication No. 14-718,
It is known that the above-mentioned printed wiring board is attached using a highly flexible synthetic resin film such as polyester, along the unevenness of the back surface of the instrument case. In this case, since the film has flexible printed wiring, there is an advantage that the wiring board can be easily routed even if the instrument case has irregularities or steps.

[Problem that the invention attempts to solve]

However, as shown in FIG. 1, although not shown in the printed wiring film 1, as the number of electrical connections increases with the connection terminals of the instruments, display devices, lighting devices, etc. When forming the conductive circuit patterns 3 from the foil portion 2, it may be necessary to take a detour to prevent each circuit pattern 3 from wrapping, and at this time, the printed wiring film 1 itself formed by making a detour may have to be formed. The length of the printed wiring film 1 tends to become long, and if the length of the printed wiring film 1 placed along the back side of the instrument case 4 becomes longer than the length of the printed wiring film 1 placed along the back side of the instrument case 4, the length of the printed wiring film 1 may become longer. It may lift up and protrude from the back surface, and this protruding part may bend locally or break when pressed by other equipment, etc., causing problems.

[Means for solving problems]

This idea solves the above problem, and
A printed wiring film on which a conductive circuit pattern is formed is attached along the back surface of the instrument case, and electrical equipment inside the instrument case or external electrical equipment is electrically connected to the printed wiring film, and the above-mentioned The instrument is characterized in that a protruding holder is formed on the back surface of the instrument case, and the excess portion of the printed wiring film that floats and detours is routed along the protruding holder for wiring. The surplus part of the printed wiring film that is placed up from the back side of the case tends to fall down when being routed or pressed by external equipment, but the protruding holder prevents the surplus part from falling down. It is designed to be supported, prevent local bending, and prevent problems such as wire breakage.

〔Example〕

Embodiments of this invention will be described below based on the accompanying drawings.

FIG. 2 is a perspective view of an automobile instrument case, which is an embodiment of this invention, seen from the back side, and shows that inside the instrument case 10 there are a speedometer, a tachometer, and a tachometer (not shown).
Instruments such as a fuel gauge and a temperature gauge that indicate the vehicle driving situation are housed therein, and a printed wiring film 11 for instrument wiring is attached along the back surface of the instrument case 10.

The printed wiring film 11 is formed with a foil-conducting portion 12 that is electrically connected to connection terminals of instruments, a foil-conducting portion 12A that is electrically connected to an instrument illumination lamp (not shown), and the like. foil part 12,
A conductive circuit pattern 13 is formed by running from 12A, and is electrically connected to a vehicle-mounted battery (not shown).

In addition, since it is necessary to route and arrange a plurality of foil conductive parts 12, 12A and conductive circuit patterns 13 on the printed wiring film 11 in accordance with the positions of the instruments housed in the instrument case 10, sometimes the conductive There are cases where it is necessary to route the circuit pattern 13 and the conductive foil portions 12, 12A in a detour so that they do not overlap.
If the length of the printed wiring film 11 becomes longer than the length dimension to be routed around and arranged on the back side of the instrument case 10, the excess portion 1 will rise from the back side of the instrument case 10 and be detoured.
1A is generated.

At this time, on the back surface of the instrument case 10, a protruding holder 14 is integrally formed to protrude and form the surplus portion 11A at a location where no instrument connection terminal or instrument illumination lamp is arranged. There is.

Therefore, when installing the printed wiring film 11 on the back side of the instrument case 10, the instrument case 1
The conductive foil portion 12 of the printed wiring film 11 is adapted to the terminals of various instruments led out from the back side of the circuit pattern 13, and a circuit pattern 13 is formed. At this time,
At the 14 protruding holders formed on the instrument case 10, as shown in FIGS. 3A and 3B, the surplus portion 11A of the printed wiring film 11 is routed over the protruding holders 14 and arranged. Even if you press this surplus portion 11A with your fingertip, the surplus portion 11A will be bent as a whole along the protruding holder 14, but it will not bend locally and the print will not fit during installation and wiring. There is no need to worry about damaging the wiring film 11.

Further, even if the excess portion 11A of the printed wiring film 11 is pressed against the equipment of the vehicle when installing the instrument case 10 with the printed wiring film 11 attached to the instrument panel of the vehicle after assembly is completed, the protruding holder 14 Since the position is regulated by this, it is possible to avoid the phenomenon of extreme bending in some parts, and thereby it is possible to prevent disconnection accidents in the conductive circuit pattern 13 portion.

[Effect of idea]

As described in detail above, according to the present invention, a protruding holder is formed on the back surface of the instrument case, and the excess portion of the printed wiring film that is lifted and detoured is routed along the protruding holder for wiring. Even if the excess portion of the printed wiring film that is lifted up from the back side of the instrument case is pressed by mistake, the excess portion will bend along the protruding holder, causing the printed wiring film to be partially damaged. There is no bending, which has the effect of protecting the printed wiring film.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a conventional printed wiring film mounting device, Fig. 2 is a perspective view of the main parts of an embodiment of this invention, and Figs. FIG. 3 is a cross-sectional view showing main parts. 10... Instrument case, 11... Printed wiring film, 11A... Surplus part, 12, 12A...
Conductive foil portion, 13... conductive circuit pattern, 14... protruding holder.

Claims (1)

[Scope of utility model registration request] A flexible printed wiring film with a conductive circuit pattern is attached to the back of the instrument case, and electrical equipment inside the instrument case or external electrical equipment is electrically connected to the printed wiring film, and the above-mentioned A protruding holder is integrally formed at an appropriate location on the back surface of the instrument case, and the excess portion of the printed wiring film that is disposed up from the back surface of the instrument case is drawn along the protruding holder. A featured printed wiring film mounting device.