JPH11204961A - Structure for holding flexible wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save space and eliminate limit on engaging part formation by holding the edge of a flexible wiring board in a case without farming a holding rib. SOLUTION: A structure for holding a flexible wiring board holds the edge of a flexible wiring board 4 provided at the bottom of a case 1 by bending the edge at a corner 1c of the bottom plane 1a and the side wall 1b of the case 1. A lateral long hole 5 is formed at the bottom plane 1a near the corner 1c, and a tongue 4a formed at the edge of the flexible wiring board 4 is bent and inserted into the long hole 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure for holding a flexible wiring board, and more particularly to a structure for holding a flexible wiring board in a case of an instrument.

[0002]

2. Description of the Related Art As shown in FIGS. 5 and 6, in a vehicle instrument or the like, a structure for holding a protruding end 4a of a flexible wiring board 4 attached to a bottom surface of a case 1 is provided at a rear corner of the case 1. A claw-shaped holding rib 2 is provided in the portion, and the end 4a of the flexible wiring board 4 is bent and inserted into the groove 3 inside the holding rib 2, and the bent end 4a is pressed and held by the holding rib 2. A known holding structure is known (see Japanese Utility Model Laid-Open No. 3-71691).

[0003]

In the above holding structure,
In order to provide the holding rib 2 and the groove 3 at the corner of the case 1,
Accordingly, the thickness of the case 1 increases, and a space corresponding to the thickness is required. Holding rib 2 to reduce the space
It is conceivable to reduce the thickness of the case 1, but this would cause a problem of the strength of the case 1. Further, since an engaging portion for joining the front glass and the facing cannot be formed at the position of the holding rib 2, there is a problem that the formation of the holding rib 2 is restricted.

The present invention has been made by paying attention to the above-mentioned point, and a flexible wiring board holding structure capable of holding an end portion of a flexible wiring board in a case without forming a holding rib and enabling space saving. The purpose is to provide.

[0005]

According to a first aspect of the present invention, an end of a flexible wiring board attached to a bottom surface of a case is bent at a corner between the bottom surface and the side wall of the case. A flexible wiring board holding structure that is bent and held, wherein a laterally long hole is formed in the bottom surface near the corner, and a tongue piece formed at an end of the flexible wiring board in the long hole. Is bent and inserted.

According to the first aspect of the present invention, the tongue can be held in the case by bending the tongue formed at the end of the flexible wiring board and inserting it into the elongated hole. Since the holding rib is not required, the space can be saved, and since there is no holding rib, there is no restriction on the engaging portion such as the look back.

According to a second aspect of the present invention, there is provided the flexible wiring board holding structure according to the first aspect, wherein the elongated hole has a tapered surface facing an inner surface of the flexible wiring board. Further, the inner surface of the corner portion is formed in a shape having a downward slope or roundness from the bottom surface to the side wall.

Therefore, in the invention according to claim 2, the tongue piece of the flexible wiring board is inserted obliquely from above into the long hole, and even if the tip hits the inner surface of the corner, it can be inserted smoothly while being lifted upward, and assembled. Work becomes easier.

The invention described in claim 3 is the first or second invention.
The holding structure for a flexible wiring board according to the above, wherein a reinforcing rib is formed at a position on the inner surface of the corner and over the elongated hole, and a groove communicating with the elongated hole is formed in the reinforcing rib. It is a feature.

For this reason, in the third aspect of the present invention, a reduction in strength due to the provision of the long hole is compensated for by the reinforcing rib, and deformation around the long hole can be prevented.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. The same members or those having the same functions as those in FIGS. 5 and 6 are denoted by the same reference numerals.

FIGS. 1 and 2 show a first embodiment of the present invention, in which a corner 1 of a bottom surface 1a and a side wall 1b of a case 1 is shown.
c is formed so as to have a downward slope or a rounded shape from the bottom surface 1a to the side wall 1b, and the bottom surface 1a has one or a plurality of laterally oriented portions (substantially parallel to the side wall 1b) at locations adjacent to the corners 1c. A long hole 5 is formed. The long hole 5 has an upper inner surface (a surface facing the inside of the bent portion of the flexible wiring board 4) formed in a tapered surface 6.

At the end of the flexible wiring board 4, a tongue piece 4a having a width slightly smaller than the width of the long hole 5 is formed at the position of the long hole 5. The flexible wiring board 4 is a bottom surface 1a of the case 1.
, And the tongue piece 4 a is bent and inserted into the long hole 5. As a result, the tongue piece 4a, which is a protruding portion of the flexible wiring board 4, is stored and held in the case 1.

By forming the inner surface on the upper side of the long hole 5 into a tapered surface 6 and forming the inside of the corner 1c into an inclined or round shape, the tongue piece 4a is inserted into the long hole 5 obliquely from above. Even if the tip of the tongue piece 4a hits the inner surface of the corner 1c, it can be inserted smoothly while being lifted upward.

If the inner surface of the corner portion 1c is formed at a right angle and the upper surface of the long hole 5 is formed at a right angle (perpendicularly) to the bottom surface 1a, the tongue piece 4a is bent at a substantially right angle. This is because the flexible wiring board 4 must be inserted while being bent, so that the insertion may be difficult due to the occurrence of stress in the flexible wiring board 4. However, the corner 1c is a right angle, and the top surface of the long hole 5 is parallel to the bottom surface 1a. However, the object of holding the end of the flexible wiring board 4 without providing the holding rib 2 can be achieved.

As described above, in the flexible wiring board holding structure of the first embodiment, the tongue piece 4a formed at the end of the flexible wiring board 4 by forming the elongated hole 5 at the corner 1c of the case 1 is provided. The insertion into the elongated hole 5 eliminates the need for the holding ribs 2, so that the thickness of the case 1 does not change, and space can be saved. There is an advantage that there is no restriction on the formation of the engaging portion 11.

FIGS. 3 and 4 show a second embodiment of the present invention, in which a corner 1c and a long hole 5 are the same as those in the first embodiment. In the second embodiment, a reinforcing rib 8 is formed at the position of the elongated hole 5 so as to protrude from the inner surface of the corner 1c. A groove 9 having one end opening toward the long hole 5 is formed in the reinforcing rib 8. The tongue piece 4a of the flexible wiring board 4 is inserted into the groove 9 from the long hole 5, and is stored and held in the groove 9.

In the second embodiment, the reinforcing ribs 8 compensate for the decrease in the strength of the case 1 due to the provision of the elongated holes 5.
Deformation around the long hole 5 can be prevented, and the reinforcing rib 8
Can use the vacant space in Case 1,
There is an advantage that it does not hinder space saving.

[0019]

As described above, according to the first aspect of the present invention, a long hole is formed in the bottom surface near the corner of the case, and the long hole is formed at the end of the flexible wiring board. Since the tongue piece is bent and inserted, the end of the flexible wiring board can be held in a good shape without the provision of holding ribs. There is no restriction on the formation of the engaging portion.

According to the second aspect of the present invention, the elongated hole is formed such that the surface facing the inner surface of the flexible wiring board is a tapered surface, and the inner surface of the corner is inclined downward or rounded. Therefore, in addition to the effect of the first aspect of the present invention, the tongue piece can be inserted into the oblong hole obliquely from above, and can be smoothly inserted while being lifted upward even when the tip hits the inner surface of the corner, so that the assembling property is improved. Become good.

According to the third aspect of the present invention, the reinforcing rib is formed on the inner surface of the corner portion and at the position corresponding to the elongated hole. The reduction in strength due to the provision of the holes is compensated for by the reinforcing ribs, and deformation around the long holes can be effectively prevented.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a holding structure for a flexible wiring board according to the present invention.
It is a perspective view of an embodiment.

FIG. 2 is a longitudinal sectional side view of the first embodiment.

FIG. 3 shows a second embodiment of the flexible wiring board holding structure of the present invention.
It is a longitudinal section side view of an embodiment.

FIG. 4 is a partially cutaway perspective view of the second embodiment.

FIG. 5 is a perspective view of a conventional flexible wiring board holding structure.

FIG. 6 is a vertical sectional side view of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 1a Bottom surface 1b Side wall 1c Corner 4 Flexible wiring board 4a Tongue piece 5 Long hole 6 Tapered surface 8 Reinforcement rib 9 Groove

Claims (3)

[Claims] 1. A flexible wiring board holding structure in which an end of a flexible wiring board attached to a bottom surface of a case is bent and held at a corner between a bottom surface and a side wall of the case, and The flexible wiring board holding structure, characterized in that a horizontally elongated hole is formed in the bottom surface near the portion, and a tongue formed at an end of the flexible wiring board is inserted into the elongated hole by bending. 2. The elongated hole has a tapered surface facing the inner surface of the flexible wiring board, and the inner surface of the corner is formed to have a downward slope or a rounded shape from the bottom surface to the side wall. The holding structure for a flexible wiring board according to claim 1, wherein: 3. A reinforcing rib is formed on the inner surface of the corner portion and at a position corresponding to the elongated hole, and a groove communicating with the elongated hole is formed in the reinforcing rib.
The flexible wiring board holding structure as described in the above.