JPS63166288A - Flexible printed circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to flexible printed circuit boards that are often used in electrical equipment, and in particular to a flexible printed circuit board in which electrical components such as check batts and resistors are concentrated on a portion of the surface of the flexible printed circuit board. The present invention relates to a flexible printed circuit board having a mounting configuration in which a protruding portion is provided, and the protruding portion can be easily pulled out from, for example, a camera housing as needed.

(Prior art) Flexible printed circuit boards have traditionally been thin and highly flexible, and can be bent freely and efficiently stored in narrow spaces within equipment, making them suitable for many electrical devices. It is used.

Generally, there is an IC1 resistor on the flexible printed circuit board surface.
Rigid electrical components such as capacitors are placed thereon, and connection patterns are formed to provide electrical continuity between the electrical components. Then, during product assembly, service inspection, etc., the electrical circuits of the flexible printed circuit boards on which these electrical components are installed are checked.

Conventionally, circuit elements and check pads, etc. that need to be checked at this time are concentrated in one place on the surface of the flexible printed circuit board, for example, at a protrusion, in order to improve work efficiency by making it possible to check at only one place. ing.

Figure 3 (A) is a schematic diagram of a conventional flexible printed circuit board mounted on a part of the camera housing, Figure 3 (B)
2 is a schematic diagram of the flexible printed circuit board shown in FIG. 2A developed on one plane. In the figure, 31 is a camera housing, 32 is an upper lid of the camera, and 33 is a flexible printed circuit board, which is composed of a main printed circuit board 30 and a protrusion 34. The protrusion 34 integrally protrudes from a part of the main printed circuit board 30, and the protrusion 34 is provided with check pads 41, semi-fixed resistors 42, and other electrical components for checking and adjustment. There is. 43 is an IC provided on the main printed circuit board 30.

When checking the electric circuit of the flexible printed circuit board 33 mounted in the camera housing 31 shown in the same figure, first remove the upper cover 32 and insert the protrusion 34 of the exposed flexible printed circuit board 33 in the direction of the arrow 35. The camera is rotated to take it out of the camera housing 31 through the electrical components and check pad 41 provided on the protrusion 34 . In this way, conventionally, the protrusion 34 was rotated and taken out for checking, so it became necessary to provide an opening large enough inside the camera housing to allow the protrusion 34 to be rotated and pulled out. Therefore, it required a lot of unnecessary space.

In addition, the structure shown in the figure cannot be applied to products that cannot have a large opening.

(Problems to be Solved by the Invention) The present invention makes it possible to easily check electrical circuits on the flexible printed circuit board even when the flexible printed circuit board is mounted in a housing that has only a very small opening. The purpose of the present invention is to provide a flexible printed circuit board having a mounting form.

(Means for solving the problem) A part of a flexible printed circuit board on which an electronic circuit for controlling the drive of an electronic device is mounted is connected to a main printed circuit board area containing the main part of the electronic circuit, a check pad, and a semi-fixed resistance switching member. A protrusion area having pads or electrical components such as the like, and a flexible area connecting the two areas, and the protrusion area is approximately parallel to the surface of the main printed circuit board area using the flexible area. The flexible region is sloped and the protrusion region is moved substantially parallel to the main printed circuit board region so that it can be pulled out from the electronic device housing in a parallel direction.

In particular, a preferred embodiment of the present invention is characterized in that the flexible region is formed by providing two substantially orthogonal cut portions on the surface of the flexible printed circuit board.

(Example) Fig. 1 is a schematic diagram of an embodiment of the flexible printed circuit board of the present invention developed on one plane, and Fig. 2 shows the flexible printed circuit board of the present invention mounted inside the lens housing of a camera lens. FIG. 3 is a schematic diagram showing a portion of the flexible printed circuit board pulled out and retracted from the lens housing. In FIGS. 1 and 2, reference numeral 3 denotes a flexible printed circuit board, which has a main printed circuit board area 1 and a protrusion area 2. As shown in FIG. Electrical components such as a check butt 11, a semi-fixed resistor 12, and a switch means 13 are provided in the protrusion region 2. 14 is an IC provided in the main printed circuit board area 1;

Between the main printed circuit board area 1 and the protrusion area 2 there are provided two substantially orthogonal cuts 15 , 16 , which form the flexible area 4 . Then, the flexible region 4 is bent to have an arcuate curvature so that the back surface of the protrusion region 2 and the back surface of the main printed circuit board region 1 are overlapped with each other to form a mounting configuration as shown in FIG. It is housed in a narrow space formed between the lens barrel 21 and the lens barrel 21. At this time, the main printed circuit board area 1 is fixed in the housing 20 by a fixing member, and only the protrusion area 2 curves the flexible area 4 continuously so that the main printed circuit board area 1 is curved in the direction of the arrow 22 in a direction substantially parallel to the surface of the main printed circuit board area. It is constructed so that it can be pulled out from inside the housing 20 in the direction shown.

By using a flexible printed circuit board with such a mounting form, the flexible printed circuit board 3 can be mounted well within the narrow space of the housing 20, and furthermore, when checking the electric circuit, the protruding parts on which the necessary electrical parts are installed can be easily mounted. Since only the partial area 2 needs to be pulled out from inside the housing 20, it can be easily checked.

In FIG. 2, 23 indicates the optical axis of the lens system (not shown);
4 is an outer lens cylinder.

In this embodiment, by providing two substantially orthogonal notches 15 and 16 in a part of the flexible printed circuit board 3, a fixed main printed circuit board area and a protrusion area as a movable part constitute a flexible area. , a case is shown in which only the protrusion region is drawn out using this visibility region. However, in this embodiment, this other printed circuit board area is fixed, and any shape of the notch, such as an H-shaped notch, can be used as long as it allows only the protrusion area to be pulled out. Also good.

Also, as a method of bending a flexible printed circuit board,
In addition to the above description, the flexible region 4 may be bent to have two arcuate curvatures so that the back surface of the protruding portion 2 overlaps the front surface of the main printed circuit board 1.

In this embodiment, a case is shown in which both the main printed circuit board area 1 and the protrusion area 2 have a planar shape and are housed in the space of the casing 20. It may be configured to have a freely curved shape, for example, in an arc shape, in accordance with the shape of the space formed by the tube 21.

(Effects of the Invention) According to the present invention, by configuring the flexible printed circuit board to have the above-mentioned mounting form, it can be efficiently stored in a narrow space, and by simply pulling out the protrusion from the housing. A flexible printed circuit board whose electrical circuit can be easily checked can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of one embodiment of the developed flexible printed circuit board of the present invention, FIG. 2 is an explanatory diagram of the flexible printed circuit board of FIG. 1 mounted in a housing, and FIG.
Figures (A) and (B) are a schematic diagram of a conventional flexible printed circuit board mounted on a part of a camera body, and an explanatory diagram of the flexible printed circuit board. In the figure, 3 is a flexible printed circuit board, 1 is a main printed circuit board area, 2 is a protrusion area, 4 is a flexible area, 15.16 is a notch part, 20
is the housing, 21 is the lens barrel, 23 is the optical axis of the lens system, 2
4 is a lens barrel outside the lens. Patent applicant: Canon Co., Ltd. 2nd review 3 mouth (A) 3 figure (B) Techniques and techniques 11 Ordinary placement (spontaneous) On September 8, 1986, submitted to the Patent Office by the government, “1 ¥fF- Indication of 1986 Patent Application No. 310039 2, Name of the invention Flexible printed circuit board 3, Relationship with the case of the person making the amendment Patent applicant address 3-30-2 Shimomaruko, Ota-ku, Tokyo Name Hoo)
Canon Co., Ltd. Representative Noh Kaku 3 Department 4, Agent Address 301 Jiyugaoka, Belheim, 2-17-3 Okusawa, Setagaya-ku, Tokyo 158 (Telephone 718-5614) (1)
Claims column of the specification (2) Detailed explanation of the invention column 6 of the specification, contents of amendments (1) As shown in the attached sheet (2) (() r on page 5, line 7 of the specification "Semi-fixed resistance switching" is corrected to "semi-fixed resistance, switching." (B) "Not shown" on page 7, line 13 of the specification is corrected to "not shown." Claims (1) ) A part of a flexible printed circuit board equipped with an electronic circuit that controls the drive of an electronic device, with a main printed circuit board area containing the main part of the electronic circuit, and a butt or electrical component such as a check pad, semi-fixed resistor, switching member, etc. The protrusion area is formed of a flexible area connecting both areas, and the protrusion area is attached to the electronic device casing in a direction substantially parallel to the surface of the main printed circuit board area using the flexible area. A flexible printed circuit board characterized in that the flexible region is curved and the protrusion region is moved substantially parallel to the main printed circuit board region to arrange electrical equipment so as to be more easily drawn out. (2) The above-mentioned flexible printed circuit board. 2. The flexible printed circuit board according to claim 1, wherein the flexible region is formed by providing two notches substantially orthogonal to each other on the surface of the flexible printed circuit board.

Claims (2)

[Claims] (1) Part of the flexible printed circuit board that carries the electronic circuit that controls the drive of electronic equipment is separated from the main printed circuit board area containing the main part of the electronic circuit and pads such as check pads, semi-fixed resistance switching members, or electrical components. and a flexible region connecting the two regions, and the projecting region is moved from the electronic device casing in a direction substantially parallel to the surface of the main printed circuit board region using the flexible region. A flexible printed circuit board, characterized in that the flexible region is curved and the protrusion region is moved substantially parallel to the main printed circuit board region so that it can be drawn out. (2) The flexible printed circuit board according to claim 1, wherein the flexible region is formed by providing two substantially orthogonal notches on the surface of the flexible printed circuit board.