JPH0638464Y2 - Flexible wiring board with holding member - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible wiring board that has at least two conductor pattern exposed portions and is attached to an external structure, and in particular, is positioned at a predetermined position of the external structure. The present invention relates to a flexible wiring board (hereinafter referred to as FPC) in which an electric element to be mounted is mounted on one conductor pattern exposed portion.

The FPC of the related art has a thin thickness and is bendable, so that the conductor pattern tends to be easily cut. In particular, since the soldering pattern and wiring pattern are directly exposed in the part to be mounted on the electric element, if the area of the exposed part becomes large or the weight of the electric element becomes heavy, the exposed part of the exposed part will be damaged when the FPC is attached to the external structure. There is a drawback that the pattern is easily cut. In particular, when an adjusting electric element such as a semi-fixed resistor is placed on the exposed portion of the conductor pattern, an external force is applied during the adjustment, and the conductor pattern is more easily cut. Therefore, in order to prevent this, a thick plate material is usually lined on the back surface of the exposed portion of the conductor pattern of the FPC.
Further, electric elements (for example, light receiving elements, display elements, switches, etc.) to be arranged at predetermined positions of the external structure are once attached to the holding member for the purpose of positioning to the external structure and easy attachment. After being fixed, it is attached to the external structure.

Problems to be Solved by the Invention As described above, in an FPC having a conductor pattern exposed portion for mounting an electric element that needs to be positioned on an external structure and a conductor pattern exposed portion where the pattern is easily cut, a holding member and a backing are respectively provided. There is a drawback in that a member is required and a structure for attachment to an external structure is complicated.

The present invention seeks to provide an FPC having such a simple structure for attachment to an external structure in such an FPC.

Means for Solving the Problems The present invention is to provide a holding portion for holding an electric element body that needs to be positioned on an external structure, a positioning portion for positioning on the external structure, and a conductor pattern of an FPC that easily breaks the pattern. A holding member having an abutting portion that abuts the back surface of the exposed portion is provided, and the abutting portion of the holding member is attached to the FPC portion that requires pattern break prevention.

Action According to the above configuration, the holding member for the electric element that needs to be positioned on the external structure is used for the original purpose of positioning the electronic element on the external structure, and the conductor pattern is easily cut. It is also used as a backing member for exposed parts.

Embodiment An embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a plan view of the FPC structure provided with a holding member as seen from above, and FIG. 2 is a line A- in FIG.
FIG. 3 is a side view of the structure of FIG. 1 as seen from the left side of the drawing. In the figure, a plurality of electric elements such as three semi-fixed resistors (2) and an integrated circuit (hereinafter referred to as IC) (3) are centrally arranged on a part of the upper surface of the FPC (1). Has been done. In FIG. 1, the area surrounded by the alternate long and short dash line (1a) is the portion where the wiring pattern is exposed, and the soldering lands for the semi-fixed resistor (2) and the IC (3) are shaded. The flat portion (4a) of the holding member (4) is provided below the electric element mounting portion of the FPC (1).
Is affixed, and this affixed portion acts as a backing member for the electrical element group mounting portion of the FPC (1). The flat portion (4a) is provided with a positioning groove (4b) and a positioning hole (4c) at the upper end and the lower end in FIG. 1, respectively. The positioning groove (4b) and the hole (4c) connect the holding member (4) to an external structure (not shown).
It is for positioning and fixing at a predetermined position.

The FPC (1) is bent downward from the end (1b), and the light receiving element or the photoelectric conversion element (5) is attached to the extension piece (1c). Here, the light receiving element (5) is shown as an example of an electric element to be arranged at a predetermined position of the external structure, and in this embodiment, it has a columnar shape as shown in FIG. Its tip is hemispherical for condensing. The holding member (4) has a T-shaped cross section as shown in FIG. 2 and has legs (4d) extending downward.
As shown in FIG. 3, a hole (4e) into which the cylindrical portion of the light receiving element (5) is fitted and an opening (4f) having a width narrower than the diameter of the hole (4e) are formed at the lower end of the. . Where the hole (4e)
Is slightly smaller than the diameter of the light receiving element (5), and the opening (4f) is used as a relief when the light receiving element (5) is press-fitted into the hole (4e). Also, FPC
The extension piece (1c) of (1) is the leg (4d) of the holding member (4).
3 is placed so as to come into contact with the rear surface of FIG. 3, and the light receiving element (5) is electrically connected to the FPC (1) by soldering, for example, as shown in FIG. By this, FPC (1)
Since the light receiving element (5) mounted on the is fixed to the holding member 4 by the leg (4d) and the holding member (4) is positioned in the external structure by the groove (4b) and the hole (4c), the light receiving element (5)
Can be accurately and reliably positioned with respect to the external structure. In addition, since the flat portion (4a) of the holding member (4) is also used as a backing member for mounting other large electric elements such as semi-fixed resistors and ICs, not only the backing member is unnecessary, but also the electric element ( 2), (3), (5) as 1
Since it can be one circuit block, the FPC structure is simple and the assembly to the external structure is easy.

In the above embodiment, the holding member has a T-shaped cross section,
The shape of the holding member can be arbitrarily changed according to the space of the external structure to be positioned. For example, the entire holding portion may be flat as shown in FIG. 4 or shown in FIG. You may make it L shape like this.

Further, in the above-mentioned embodiment, the electric element to be positioned in the external structure is held by being press-fitted into the hole of the holding member, but the holding member is simply a hole through which the lead wire of the electric element passes. FPC this lead wire on the back side
It may be held by soldering.

Effect As described above, according to the present invention, the electric element body that needs to be positioned on the external structure is held by the holding part, and the positioning part positions the external structure with respect to the external structure. Since the holding member is configured so as to contact the back surface of the other conductor pattern exposed portion where the pattern is easily cut, and the electric element is attached to the FPC via this holding member, the electric element main body with respect to the external structure is attached. Positioning can be performed with high accuracy and reliability. Further, since the contact portion is also used as the backing member for the conductor pattern exposed portion where the pattern is easily cut, the number of constituent parts can be reduced and the structure for attachment to the external structure can be simplified. Further, according to the embodiment of the present invention, since the abutting portion is shared as the backing member of the FPC portion in which a plurality of other electronic elements are collectively arranged, these electric elements are also fixed as one circuit block. This makes the FPC configuration simpler and easier to assemble to an external structure.

[Brief description of drawings]

1 is a plan view showing an embodiment of the present invention, FIGS. 2 and 3 are sectional views and a side view thereof, FIG. 4 is a sectional view showing another embodiment of the present invention, and FIG. It is sectional drawing which shows another Example. 1: FPC, 4: holding member, 5: electric element, 4a: contact portion, 4b, 4c:
Positioning part, 4e, 4f: Holding part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page Judgment panel Judgment chief Takato Tsutsumi Judge Judge Hideo Shimizu Judge Katsumasa Tsunekawa (56) Bibliography Sho 53-50468 (JP, U)

Claims (2)

[Scope of utility model registration request] 1. A flexible wiring board in which a lead wire of an electric element to be arranged at a predetermined position of an external structure is connected to one conductor pattern exposed portion of two conductor pattern exposed portions, wherein a main body portion of the electric element is provided. A holding portion for holding so as to sandwich it, a positioning portion for positioning the main body of the electric element at a predetermined position of the external structure, and an abutting portion attached so as to abut on the back surface of the other conductor pattern exposed portion. A flexible wiring board to which a holding member having is fixed. 2. The flexible wiring according to claim 1, wherein a plurality of other electric elements are centrally arranged on the exposed portion of the other conductor pattern of the flexible wiring board with which the abutting portion of the holding member abuts. substrate.