JP3018054U - Flat cable - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a flat cable that is resistant to bending and returning by making the end of the insulating tape on the side to which the reinforcing plate is attached to have a specific shape. [Structure] A plurality of conductors 1 are fixed between two composite insulating tapes 2a and 2b in which a resin layer having heat resistance higher than that of the thermoplastic resin layer is provided on an outer layer g of the thermoplastic resin layer of the base material layer k. Arrange in parallel at intervals. The conductors 1 at both ends are exposed for a certain length to form a connection terminal portion t. A heat crushing portion d having a substantially triangular cross section is provided at the end of the composite insulating tape 2a on the side to which the reinforcing plate 3 is attached. Further, the heat crushing portion d
The reinforcing plate 3 is attached to the end of the composite insulating tape 2a provided with and the conductor 1 of the connection terminal portion t to form the flat cable 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flat cable. More specifically, the present invention relates to a flat cable in which a reinforcing plate is attached to a connection terminal portion of the flat cable, which is used as an internal wiring of various electronic devices such as computer equipment.

[0002]

[Prior art]

 A flat cable has a structure in which a plurality of conductors are arranged in parallel between two insulating tapes at regular intervals, and conductors at both ends are exposed for a certain length to provide connection terminals. It is used to connect printed circuit boards in various electronic devices. It is known that at its end, a reinforcing plate is provided to facilitate connection with the connector.

A conventional flat cable will be described with reference to FIG. FIG. 3 (a) is a vertical cross-sectional view of the flat cable 4, where 1 is a rectangular conductor, 2 is an insulating tape, and 3 is a reinforcing plate. In this flat cable 4, a plurality of conductors 1 formed in a rectangular shape are arranged in parallel at regular intervals, and a polyvinyl chloride (PVC) resin is provided on both surfaces of this conductor 1 except for the connection terminal portion t thereof. An insulating tape 2 made of, for example, is adhered and integrated, and reinforcement is made of polyester resin or the like so as to integrally cover the surface of the conductor 1 on one side of the connection terminal portion t and the surface of the insulator 2 on one side. Plate 3 is attached. The connection between the flat cable 4 and the printed circuit board or the like is generally performed by attaching the connection terminal portion t to a connector (not shown).

[0004]

[Problems to be solved by the device]

 However, when the flat cable 4 is to be connected to a printed circuit board or the like, the flat cable 4 must be arranged in a limited space. Therefore, the connection terminal portion t may be wired in a bent state. At this time, the bending cable m and the returning cable r are applied to the flat cable 4 as shown by the arrows in FIG. 3 (a), so that the stress is concentrated most near the end of the insulating tape 2. However, at this end, a gap s of a non-adhesive portion is formed between the conductor 1 and the reinforcing plate 3 attached on the insulating tape 2, and the conductor 1 extends at this portion, as shown in Fig. 3 (b). As shown in the figure, the elongated portion e was formed, and in the extreme case, the portion e was sometimes cut off.

The present invention has been made in order to solve the problems of the above-described prior art, and the end portion of the insulating tape on the side to which the reinforcing plate is attached has a specific shape so that it can be bent and returned. The purpose is to provide a strong flat cable.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention arranges a plurality of conductors in parallel between two insulating tapes at regular intervals and exposes conductors at both ends for a certain length to form a connection terminal portion. In a flat cable to which a reinforcing plate integrally covering the insulating tape on one surface and the connection terminal portion is attached, the two insulating tapes are outer layers of the thermoplastic resin layer of the base material layer k. g is a composite insulating tape 2a, 2b in which a resin layer having heat resistance higher than that of the thermoplastic resin layer k (hereinafter abbreviated as heat-resistant resin layer) is provided, and the reinforcing plate 3 is attached. At the end of the composite insulating tape 2a, there is a flat cable 4 having a heat crushed portion d crushed by a heat press.

Further, the present invention is the flat cable 4 in which the thermoplastic resin layer k is a polyvinyl chloride resin layer and the heat resistant resin layer g is a polyester resin layer.

Further, the present invention is the flat cable 4 in which the heat crushing portion d has a substantially triangular cross section in which the thickness becomes thinner toward the tip or almost only the heat resistant resin layer is left. .

Examples of the thermoplastic resin include polyethylene resin, polyurethane resin, polyamide resin, and the like, in addition to the polyvinyl chloride resin. In addition to the polyester resin, polyethylene terephthalate resin, polyester imide resin, polyamide imide resin, polyimide resin and the like can be cited as the heat resistant resin. Further, the combination of the thermoplastic resin and the heat resistant resin can be arbitrarily selected according to the purpose. The thickness of the heat resistant resin layer g is set to be smaller than the thickness of the thermoplastic resin layer k, and for example, a thickness of about 1/5 to 1/10 is suitable.

[0010]

[Action]

 The flat cable of the present invention has a cross-section in which the end of the composite insulating tape 2a having the heat-resistant resin layer g provided on the outer layer is crushed by a heat press such as a heat roller or a heat plate, and the thickness decreases toward the tip. Since the heat crushing portion d has a substantially triangular shape or a structure in which only the heat resistant resin layer is left, it is firmly bonded to the reinforcing plate 3 with almost no gap. The portion crushed by the heat press is only the thermoplastic resin layer (for example, PVC resin layer) k, and the heat resistant resin layer (for example, polyester resin layer) g remains uncrushed. Therefore, the stress concentration is relieved when the connecting terminal portion t is bent, so that the connecting terminal portion t is resistant to bending and returning, and the conductor 1 is prevented from being stretched or cut.

[0011]

【Example】

 Hereinafter, embodiments of the flat cable of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. 1 and 2 are longitudinal sectional views showing the first and second embodiments of the flat cable of the present invention, in which 1 is a conductor, 2a and 2b are composite insulating tapes, 3 is a reinforcing plate, and d is a hot pressing pad. Parts, g is an outer layer (resin layer having heat resistance, polyester resin layer), k is a base material layer (thermoplastic resin layer, PVC resin layer), and t is a connection terminal part.

Embodiment 1 The structure and manufacturing method of a flat cable according to a first embodiment of the present invention will be described in detail with reference to FIG. The conductor 1 is composed of a plurality of tin-plated rectangular copper wires (for example, 0.1 mm thickness × 0.8 mm width) (for example, 10 wires), which are arranged in parallel at regular intervals. Composite insulating tapes 2a and 2b having a polyester resin layer having a thickness of 10 μm as an outer layer and a PVC resin layer having a thickness of 80 μm as a base layer are arranged on both sides of each of the plurality of rectangular copper wires 1, and heat-rolled. The rectangular copper wire 1 and the composite insulating tapes 2a and 2b are brought into close contact with each other using a la or the like (not shown) to be integrated. Next, a hot plate (not shown) set at 200 ° C. is pressed against the end of the composite insulating tape 2a for a few seconds to dissolve and crush the PVC resin layer of the base material layer of the composite tape 2a. The thickness should be reduced toward the tip so that the cross section becomes approximately triangular. Next, the polyester resin reinforcing plate 3 with an adhesive is placed on the end of the composite insulating tape 2a provided with the heat crushed portion d and the exposed flat rectangular copper wire 1 of the connection terminal portion t, and the reinforcing plate is pressed. Flat cable 4 was manufactured by attaching 3.

Second Embodiment The structure and manufacturing method of a flat cable according to a second embodiment of the present invention will be described in detail with reference to FIG. Similar to the first embodiment, a plurality of rectangular copper wires 1 and the composite insulating tapes 2a and 2b are adhered and integrated. Next, a heat roller (not shown) set at 220 ° C. is pressed against the end of the composite insulating tape 2a for several seconds to melt and crush the PVC resin layer of the base material layer of the composite insulating tape 2a, and this heat crushed portion d However, almost only the polyester resin layer g of the heat resistant resin layer is left. Then, in the same manner as in Example 1, the reinforcing plate 3 was attached to produce the flat cable 4.

With respect to the obtained flat cables of Examples 1 and 2, the connection terminal portion t was bent and returned twice, but the flat copper wire 1 did not show any stretching or cutting, which was good. It was

[0015]

[Effect of device]

 In the flat cable of the present invention, the end portion of the composite insulating tape having the heat-resistant resin layer on the outer layer of the thermoplastic resin layer of the base material layer is crushed by a heat press such as a heat roller or a heat plate, and the end portion is Since it has a heat crushing portion having a substantially triangular cross-section that becomes thinner as it goes, or a heat crushing portion having a shape in which almost only the heat-resistant resin layer is left, it is firmly bonded to the reinforcing plate with almost no gap. Therefore, when the connection terminal is bent, the concentration of stress is relieved, which makes it more resistant to bending and returning, resulting in a flat cable that does not stretch or break the conductor. Therefore, the effect of contributing to industry is extremely large.

[Brief description of drawings]

1 is a longitudinal sectional view showing a first embodiment of a flat cable of the present invention.

FIG. 2 is a vertical cross-sectional view showing a second embodiment of the flat cable of the present invention.

FIG. 3 (a) is a vertical sectional view showing a conventional flat cable. (b) It is a longitudinal cross-sectional view showing a flat cable in which an extension portion is formed at a connection terminal portion after bending and returning.

[Explanation of symbols]

1 conductor (rectangular copper wire) 2a, 2b composite insulating tape 3 reinforcing plate 4 flat cable d heat crushed part g outer layer (resin layer having heat resistance, polyester resin layer) k base material layer (thermoplastic resin layer, polyvinyl chloride) Resin layer)) t Connection terminal part

Claims (4)

[Scope of utility model registration request] 1. A plurality of conductors are arranged in parallel between two insulating tapes at regular intervals, the conductors at both ends are exposed for a certain length to form connection terminals, and insulation of one surface of the conductors is performed. In a flat cable to which a reinforcing plate integrally covering the tape and the connecting terminal portion is attached, the two insulating tapes are formed on the outer layer of the thermoplastic resin layer of the base material layer rather than the thermoplastic resin layer. It is a composite insulating tape provided with a resin layer having heat resistance, and the end of the composite insulating tape on the side to which the reinforcing plate is attached has a heat crushed portion crushed by a hot press flat cable. 2. The flat according to claim 1, wherein the thermoplastic resin layer is a polyvinyl chloride resin layer, and the resin layer having heat resistance higher than that of the thermoplastic resin layer is a polyester resin layer. cable. 3. The flat cable according to claim 1, wherein the heat-crushed portion has a substantially triangular cross-section whose thickness decreases toward the tip. 4. The flat cable according to claim 1, wherein the heat crushed portion has a shape in which only a resin layer having almost heat resistance remains.