JPH0736374U - Reinforcement plate for flexible flat cable - Google Patents

Abstract

(57) [Summary] [Purpose] F that prevents disconnection at the boundary between the portion where the FFC reinforcing plate is attached and the portion where it is not attached.
To provide a reinforcing plate for FC. [Structure] The reinforcing plate of the present application is used by being attached to a flexible flat cable, and its strength becomes weaker as at least one end approaches the end.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a reinforcing plate for a flexible flat cable (hereinafter abbreviated as FFC), and in particular, a conductor used in a precision machine and an insulating vinyl are integrally bonded so that at least one end of the FFC moves. By doing so, the present invention relates to an FFC reinforcing plate in which the FFC is frequently bent.

[0002]

[Prior art]

 FIG. 1 shows a connection structure when connecting the FFC to the FFC connector. The FFC connector 2 is attached to the fixed portion 1. One of the FFCs to which the reinforcing plate 3 is attached is connected to the FFC connector 2. The other part of the FFC to which the reinforcing plate 5 is attached is connected to the FFC connector 6. The FFC connector 6 is attached to the movable part 7. Then, the movable portion 7 moves to the movable portion 7'within the distance X. 2 and 3 show a conventional reinforcing plate. The conventional reinforcing plate is attached to the FFC so that it can be inserted into the FFC connector. For example, the length is about 8 mm, the width is the same as the FFC, and the thickness is about 0.2 mm. The conventional reinforcing plate is attached to one surface near the end of the FFC to which the FFC connector is attached, but its strength is uniform and its strength is uniform in every part because the width and shape are also selected. Met.

[0003]

[Problems to be solved by the device]

 In the conventional FFC, the strength of the part where the reinforcing plate is attached and the part where it is not attached are extremely different. Therefore, in the conventional FFC, when the movable part moves between the moving distances X as shown in FIG. 4, the FFC bends at a large angle of θ, and there are a part where the reinforcing plate is attached and a part where the reinforcing plate is not attached. There was a defect that the force was extremely concentrated on the boundary part of (1) (that is, one end of the reinforcing plate), the bending strength was small and the wire was easily broken.

Therefore, an object of the present invention is that the bending strength of the portion to which the reinforcing plate is attached is large and it is difficult to disconnect the boundary portion between the portion to which the reinforcing plate is attached and the portion to which the reinforcing plate is not attached, An object of the present invention is to provide a reinforcing plate for FFC, which aims to prolong the life of FFC.

[0005]

[Constitution of device]

 This invention is a reinforcing plate whose open side is attached to a flexible flat cable and whose fixed side is fixed to a fixing means for connecting a flexible flat cable. The reinforcing plate is at least open along the longitudinal direction of the flexible flat cable. The reinforcing plate of the flexible flat cable is characterized in that the side is weaker than the fixed side. More preferably, the strength is gradually weakened by reducing the thickness as one side of the reinforcing plate approaches the end thereof, or by forming a notch having a large plane area.

[0006]

[Action]

 When this reinforcing plate is attached to the FFC, the boundary between the portion where the reinforcing plate is attached and the portion where the reinforcing plate is not attached does not bend at an extremely large angle, but bends smoothly according to the movement of the FFC.

[0007]

【Example】

 5 is a plan view showing an embodiment of the reinforcing plate of the present invention, and FIG. 6 is a plan view of FIG. Embodiments of the present application will be described in detail below with reference to FIGS. 5 and 6. In the embodiment of FIGS. 5 and 6, the thickness of the reinforcing plate 3 becomes thinner from one end connected to the FFC connector to the other end not connected to the FFC connector. Therefore, the bending strength of the reinforcing plate 3 becomes weaker as it goes from the thick portion to the thin portion of the reinforcing plate 3. Therefore, since the bending strength changes steplessly, it is possible to reduce concentrated bending stress applied to the boundary portion 8 between the portion of the reinforcing plate attached to the FFC connector and the portion not attached to the FFC connector. FIG. 7 is a view in which the reinforcing plate 3 of the present invention is connected to the connector 2. This figure shows that the FFC is bent at an angle θ ′ when the movable part moves between the moving distances X. Comparing this θ ′ with θ in FIG. 4, since θ> θ ′, the bending angle becomes smaller than that of the conventional FFC. As a result, it is possible to reduce concentrated bending stress applied to the boundary portion 8 of the FFC.

8 to 15 are views showing another embodiment of the present invention. In the embodiment of FIG. 8, the thickness is uniform, but one end of the reinforcing plate 3 to which the FFC is attached is cut out in a triangular saw-tooth shape. In other words, the total area of the reinforcing plate gradually decreases from the non-notched part to the notched part. The side surface is almost the same as in FIG. Therefore, the bending strength of the reinforcing plate 3 becomes weaker from the jagged root part of the reinforcing plate 3 toward the end part. Therefore, since the bending strength changes steplessly, the bending stress is not concentrated on the boundary portion 8. Further, the embodiment of FIG. 5 is complicated in manufacturing because the thickness of the reinforcing plate 3 is gradually thinned, but this embodiment can be manufactured by punching, so that the manufacturing is easy and suitable for mass production.

FIG. 9 is an example in which the notched shape of the embodiment of FIG. 8 is modified, and shows an example in which a trapezoidal notch is provided. The side surface is almost the same as in FIG. Also in this case, as in the embodiment of FIG. 6, the bending strength gradually decreases from the portion where the notch starts to the end.

FIG. 10 shows that the reinforcing plate 3 has a large number of holes at one end that is not connected to the FFC connector, and the number of holes is reduced toward the side connected to the FFC connector. This is an example of configuration. The side surface is almost the same as in FIG. Therefore, the bending strength gradually decreases from the portion with few holes to the portion with many holes.

FIG. 11 shows an example in which the length in the width direction becomes longer as each hole formed in the reinforcing plate 3 becomes closer to one end portion which is not connected to the FFC connector. The side surface is almost the same as in FIG. Therefore, the bending strength gradually decreases from the portion where the length of the hole in the width direction is short to the portion where the length of the hole in the width direction is long.

In the embodiment shown in FIGS. 8, 9, 10 and 11, the side surface is substantially the same as that shown in FIG. 3, but it is also possible to make it as shown in FIG. In this case, the bending strength is further changed, and the bending stress on the boundary portion 8 is further reduced.

12 and 13 disclose an embodiment in which holes of the same size are evenly formed in a certain portion of the reinforcing plate 3. The side surface is almost the same as in FIG. Therefore, the bending strength differs between the FFC portion without the reinforcing plate 3, the holed portion and the non-holed portion of the reinforcing plate 3, and the bending strength becomes weaker in three steps. Also in this embodiment, the thickness can be gradually reduced as shown in FIG. In other words, gradually decreasing the thickness and changing the planar shape may be combined. In that case, the bending strength changes steplessly rather than stepwise. With the above configuration, in any of the examples shown in FIGS. 6 to 13, the bending strength of the reinforcing plate changes toward the end, so that the load is concentrated at one location. It does not take.

As described above, as a technique for changing the bending strength of the reinforcing plate 3, in addition to changing the plan view shape and thickness of the reinforcing plate 3, the material of the reinforcing plate 3 is partially changed. It is also possible.

In all the embodiments described above, the reinforcing plate is attached to the end of the FFC, but as shown in FIGS. 13 and 14, the reinforcing plate 3 is not the end of the FFC but the middle of the FFC. You may attach it to the part. In this case, the fixed side is the central portion of the reinforcing plate, and the open side is both ends of the reinforcing plate.

[0016]

[Effect of device]

 According to this invention, the strength of the reinforcing plate is configured to decrease as it approaches the end thereof, so that the FFC can be smoothly bent in the portion where the reinforcing plate is attached. Therefore, it is possible to prevent the FFC from being bent at the boundary between the portion where the reinforcing plate is attached and the portion where the reinforcing plate is not attached, and as a result, it is possible to prevent the FFC from being cracked or broken, and the FFC length Life can be extended.

[0017]

[Brief description of drawings]

FIG. 1 is a view showing a connection state of an FFC to which a reinforcing plate 3 of the present invention is applied, in which a movable part 7 is moved to a movable part 7 ′.

FIG. 2 is a plan view of a conventional FFC reinforcing plate 3.

3 is a side view of a reinforcing plate 3 of the FFC of FIG.

FIG. 4 is an enlarged view of a connection portion between an FFC 4 and a FFC connector 2 to which a conventional FFC reinforcing plate 3 is attached.

FIG. 5 is a plan view of the reinforcing plate 3 of the FFC according to the first embodiment of the present invention.

6 is a side view of the reinforcing plate 3 of the FFC of FIG.

FIG. 7 is an enlarged view of a connecting portion between the FFC 4 and the FFC connector 2 to which the reinforcing plate 3 of the FFC of the present application is attached.

FIG. 8 is a plan view of a reinforcing plate 3 of an FFC according to a second embodiment of the present invention.

FIG. 9 is a plan view of a reinforcing plate 3 of an FFC according to a third embodiment of the present invention.

FIG. 10 is a plan view of a reinforcing plate 3 of an FFC according to a fourth embodiment of the present invention.

FIG. 11 is a plan view of a reinforcing plate 3 of an FFC according to a fifth embodiment of the present invention.

FIG. 12 is a plan view of a reinforcing plate 3 of an FFC according to a sixth embodiment of the present invention.

FIG. 13 is a plan view of a reinforcing plate 3 of an FFC according to a seventh embodiment of the present invention.

FIG. 14 is a plan view of an FFC reinforcing plate 3 according to an eighth embodiment of the present invention.

15 is a side view of the reinforcing plate 3 of the FFC of FIG.

[Explanation of symbols]

1; fixed part 2, 6, 6 '; FFC connector 3, 5, 5'; FFC reinforcing plate 4, 4 '; flexible flat cable (FF
C) 4a, 4c; insulator 4b; conductor 7, 7 '; movable part 8; boundary part

Claims (7)

[Scope of utility model registration request] 1. A reinforcing plate having an open side affixed to a flexible flat cable and a fixed side fixedly used for a fixing means for connecting the flexible flat cable, the reinforcing plate being at least along the longitudinal direction of the flexible flat cable. A reinforcing plate for a flexible flat cable, characterized in that the open side has a lower strength than the fixed side. 2. The reinforcing plate for a flexible flat cable according to claim 1, wherein the end portion of the reinforcing plate is formed so that the thickness thereof becomes thinner toward the tip thereof. 3. The reinforcing plate for a flexible flat cable according to claim 1, wherein the end portion of the reinforcing plate is provided with a notch at a tip portion thereof. 4. The reinforcing plate for a flexible flat cable according to claim 3, wherein the notch is formed so that the total area thereof increases as it approaches the tip of the reinforcing plate. 5. The reinforcing plate for a flexible flat cable according to claim 4, wherein the notch at the end of the reinforcing plate is formed in a sawtooth shape. 6. The reinforcing plate for a flexible flat cable according to claim 4, wherein the notch at the end of the reinforcing plate has a larger hole as it approaches the tip. 7. The reinforcing plate for a flexible flat cable according to claim 4, wherein the notch at the end of the reinforcing plate is formed with a hole whose length in the width direction increases toward the tip.