JPH04257297A - Pressing member for flexible printed circuit board - Google Patents

Abstract

PURPOSE:To provide a pressing member which is capable of combining a hair- pin shaped bent portion of a flexible printed circuit board with another flexible printed board or a rigid printed board so as to adhere to each other, because an adhesive or an adhesive double coated tape is commonly used in combining the hair-pin shaped bent portion of the flexible printed board with the rigid printed circuit board or another flexible printed board, which leads to the operating efficiency being considerably impaired. CONSTITUTION:A pressing member 3 pinches a hair-pin shaped bent portion of a flexible printed circuit board 1 as shown in the drawing, so that the board 1 is adhered to the surface of a rigid printed board 2b, whereby the boards 1 and 2 are combined with each other. The use of the pressing member 3 improves the operating efficiency to a much greater extent.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is used for connections such as solder connections or press-contact connections between flexible printed circuit boards (hereinafter referred to as "flexible") and flexible or rigid type printed circuit boards (hereinafter referred to as "printed circuit boards"). This invention relates to a flexible printed circuit board holding member.

0002

[Prior Art] Conventionally, flexible cables or flexible cables and printed circuit boards are connected by solder or pressure welding, and the extended portion is folded back from the vicinity of the connection part to the opposite side of the connection surface. , stress is applied to the connection part in the direction of separation due to the waist of the flexible cable, and the extended part cannot be tightly attached to the other flexible board or printed circuit board due to the stress caused by the waist of the flexible cable, so the area around the connection part is reinforced with adhesive. In addition, the extension of the flexible cable must be fixed with double-sided tape, which not only increases costs but also significantly impairs work efficiency.

0003

SUMMARY OF THE INVENTION An object of the present invention is to provide a holding member for preventing the flexible cables or the flexible cables and the printed circuit board from separating from each other at the connection portion.

0004

[Means for Solving the Problems] According to the present invention, the U-shaped bent portion of the flexible cable can be held in place by a holding member formed by bending a plate made of an elastic material such as metal into a substantially U-shape. I made it possible.

[0005]

[Operation] If the holding member of the present invention is fitted onto the flexible board from above the U-shaped bent part of the flexible board, the flexible board can be easily attached by bringing the U-shaped bent part into close contact with a printed circuit board, etc. installation (particularly installation involving a U-shaped bend) can be carried out much more efficiently than before.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. FIG. 5 is a plan view of the flexible printed circuit board 1, and 1a is a connecting portion that is soldered or press-connected to a connecting portion of a module unit 2, which will be described later. Reference numeral 1b denotes a spring hanging portion, which has a hole 1c and a rotation stopper portion 1d. 1e is a copper foil portion for reinforcing the spring hanging portion 1b excluding the rotation stop portion 1d, and extends to the flexible body 1 side. 1f indicates the bending position of the flexible cable.

FIG. 6 is a perspective view showing a module unit 2 for external display, which is composed of a package section 2a for housing electric elements such as a liquid crystal display board and IC, and a printed circuit board 2b. The surface on the 2a side has a pattern 2c so that the connecting portion 1a of the flexible printed circuit board 1 can be connected thereto.

FIG. 1 is a perspective view showing a flexible pressing member 3, which is an object of the present invention, and FIGS. 2 to 4 are views showing the state in which the member 3 is used. In the figure, 3a is a holding part that presses the bent part of the flexible cable 1 in close contact with the printed circuit board 2b, and 3b is a connection presser that presses down the connection part between the connection part 1a of the flexible cable 1 and the connection pattern 2c of the printed board 2b. 3c is a storage portion that stores the slack portion caused by bending the flexible printed circuit board 1.

FIG. 7 is a perspective view showing the components when the flexible presser member 3 of the present invention is applied to a camera back cover display unit. Opening/closing is performed by 4 is a back cover, 4a is a light-shielding rib, and a notch 4b is provided in the middle for passing the flexible plate 1 through. 4c is an external display window of the module unit 2, and 4d is a confirmation window for checking the presence or absence of a film cartridge.Moltoplane 5 is pasted around the periphery to prevent light from entering from outside. There is. 4e is a button storage part in which the function button 6 of the module unit 2 is stored. 4f is a screw tightening portion for fixing the inner cover 7, which will be described later. 4g is a spring fixing part for hanging the spring, and 4h is a hinge part through which the hinge is passed.

The inner lid 7 is formed of a metal plate, and has a spool roller portion 7a at one end that presses against the film wound around the spool, and a cartridge holding portion 7b for fixing the cartridge at the other end. It has the top and bottom. 7c and 7d are reinforcing ribs for increasing the rigidity of the inner lid. Reference numeral 7e denotes a pressing spring portion for pressing the film against a film detection roller provided on the camera body. 7f
is an opening through which the protrusion of the heat-stamped portion for fixing the package 2a of the module unit 2 to the printed circuit board 2b escapes. Reference numeral 8 denotes a return spring that is hung on the flexible cable 1.

[0011] The module unit 2 has already been connected to the flexible cable 1 in the previous process, and is in a connected state in which a holding member 3 for protecting the connection portion is attached. When the module unit 2 in such a state is assembled into the back cover 4, the flexible cable 1 is bent into an S-shape as shown in the figure. A part of the spring 8 has a spring hanging part 1b, and one end of the spring 8 is hung on the spring hanging part 1b of the flexible cable 1, and the other end is hung on the spring fixing part 4g of the back cover 4, so the flexible cable 1 is attached to the hinge part 4h. This means that it is biased in the opposite direction. In this state, the back cover unit is completed by tightening the inner cover 7 with screws and attaching the pressure plate.

Next, the installation of the flexible presser member 3, which is the object of the present invention, will be explained in detail.

First, as shown in FIG. 2, when the flexible cable 1 is already connected to the printed circuit board 2b of the module unit 2 (soldered or about to be pressed), press the holding member 3 from the direction shown in the figure. move it. At this time, the tip of the holding portion 3a hits the flexible cable 1, and when the holding member 3 is further moved, the flexible cable 1 is bent in the direction of the arrow. FIG. 3 further shows the pressing member 3.
At this time, since the tip of the connection holding part 3b is formed in an R shape, as shown in the figure, the flexible cable 1 and the printed circuit board 2b are pushed together while widening the distance from the holding part 3a. I'm going to squeeze it in. Then, it is pushed in until it finally takes the shape shown in FIG. In this state, the connection holding part 3b is connected to the flexible cable 1 and the printed circuit board 2b.
The holding portion 3a is in a state in which the folded flexible printed circuit board 1 is brought into close contact with the surface of the printed circuit board 2b opposite to the connection surface. Furthermore, since the flexible cable 1 is folded back, the folded part becomes larger than the thickness of the printed circuit board due to the stiffness of the flexible cable, and if you try to forcefully hold it down, the holding part 3a will lift up. . In order to prevent this, the holding portion 3a is provided with a storage portion 3c to minimize the influence of the pressing force of the bent portion of the flexible cable.

<Other Embodiments> Next, other embodiments will be explained. FIG. 8 shows a holding member 13 having a shape that is a further extension of the holding part 3a of the holding member 3 of the above-described embodiment. In this member 13, a protrusion 13d is provided in the part where the flexible board 1 is not provided to adjust the height, and at the same time, the printed circuit board 2b of the module unit 2 is connected to the
The module unit 2 is shielded by bringing the holding member 13 into contact with the ND pattern and lowering the potential to GND. FIG. 9 is a plan view showing this part.

FIG. 10 is a perspective view showing an inner cover 17 in which the inner cover 7 shown in the above-mentioned embodiment is given the function of the holding member 3.
17h is a holding portion corresponding to the holding member 3. According to such a configuration, the number of assembly steps can be reduced by integrating the parts, and work efficiency can be further improved.

[0016]

[Effects of the Invention] As explained above, the holding member of the present invention not only presses the connection part of the flexible cable, but also makes it possible to bring the folded flexible cable into close contact with the printed circuit board, thereby ensuring the reliability of the connection part. At the same time, it has the great advantage that the stiffness caused by folding the flexible cable is negated, making it possible to further improve assembly workability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a holding member according to a first embodiment of the present invention.

[Figure 2] ~

FIG. 4 is an explanatory diagram showing a state in which the pressing member 3 of FIG. 1 is assembled into a module unit.

FIG. 5 is a plan view of the flexible cable.

FIG. 6 is a perspective view of the module unit.

FIG. 7 is a perspective view showing the configuration of a camera back cover display unit.

FIG. 8 is a perspective view showing a state in which a pressing member 13 according to another embodiment of the present invention is attached to a module unit 2.

FIG. 9 is a plan view of FIG. 8 viewed from above.

FIG. 10 is a perspective view of the inner cover 17 of the back cover of the camera, in which the inner cover 17 is provided with a holding part 17h that functions as a holding member.

[Explanation of symbols]

1...Flexible printed circuit board 1b...Spring hanging part 1d...Rotation stop part
2...Module unit 2a...Package part
2b... Printed circuit board 3, 13... Holding member 3
a... Holding part 3b... Connection holding part (close contact part)
3c...Storage section 4...Back cover
7, 17...Inner lid 13d...Protrusion 8...Spring 5...Moltoplane
6...Function button storage part 4a...Light-shielding rib
4b...Cutout part 4c...External display window
4d...Confirmation window 4e...Button storage section 4f...Screw tightening section 4
g...Spring fixing part
4h...Hinge part 7a, 17a...Spool roller part
7b, 17b...Patrone holding portions 7c, 7d, 17c, 17d...Reinforcement ribs 7e, 17e...
Pressure contact spring parts 7f, 17f...opening part 17h...pressing part

Claims (2)

[Claims] 1. A holding member configured to be used in a connection portion for soldering or pressure bonding a flexible printed circuit board and a flexible printed circuit board, or a flexible printed circuit board and a rigid type printed circuit board, the holding member configured to a connection pressing part that presses the flexible printed circuit board; a contact part that brings the flexible printed circuit board into close contact with a surface opposite to a connection surface of a flexible printed circuit board or a rigid type printed circuit board to which the flexible printed circuit board is connected; A flexible printed circuit board holding member comprising: a storage section for storing a flexible printed circuit board larger than the thickness of the connection section at a connecting section with the contact section. 2. The flexible printed circuit board holding member according to claim 1, wherein the contact portion has a portion for electrical connection on a surface opposite to the connection surface.