JP2011004552A - Terminal processing method for super-extra-fine coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal processing method for a super-extra-fine coaxial cable by which a thin-film shield is instantaneously melted and vaporized applying a low voltage by a single operation without damaging a dielectric layer.SOLUTION: According to the terminal processing method for removing the thin-film shield from the super-extra-fine coaxial cable, the thin-film shield to be removed is placed between a first electrode and a second electrode to bring it into contact with the first and second electrodes. The distance between both electrodes is determined to be 1 to 10 mm, and a pulse current is supplied under a condition that electric power generated by a pulse current per super-extra-fine coaxial cable is 5×10to 1 J. This causes the thin-film shield to melt and vaporize to be removed.

Description

  The present invention relates to a terminal processing method for a superfine coaxial cable, and more particularly to a terminal processing method for a superfine coaxial cable used for increasing the bandwidth, high-density packaging, and space saving of signal transmission.

  Conventionally, an FPC (flexible printed circuit board) has been mainly used as a wiring material of an LCD (liquid crystal display) used for a notebook personal computer or the like. With the recent increase in bandwidth, high-density packaging, and space saving of signal transmission, the demand for ultra-fine coaxial cables is increasing. For example, high-speed image signals are required to improve the image quality of LCDs. Therefore, in order to cope with this, an extra-fine coaxial cable has been applied to the wiring material around the display instead of the FPC.

  A shield removal method and a terminal processing method are known for an ultrafine coaxial cable using a laterally wound shield as a shield (see, for example, Patent Documents 1 and 2). In order to reduce the outer diameter of the ultra-fine coaxial cable, the shield has been changed from a horizontally wound shield to a thin film shield such as a copper thin film. However, when using a thin film shield such as a copper thin film in this way, the surface of the dielectric layer is treated to improve the adhesive strength between the dielectric layer and the thin film shield in order to improve the bending resistance of the ultrafine coaxial cable. It has been improved, which makes it difficult to remove the thin film shield and deteriorates the terminal processability.

  Currently, a pulse laser, for example, a pulse laser having a wavelength of 1.06 μm, is used to remove the thin film shield of the ultra-fine coaxial cable. However, since the thin-film shield in the shadowed portion of the laser is not removed, it is necessary to irradiate the pulse laser from the opposite side, and the required time becomes long (total time is about 10 seconds). Further, there is damage to the dielectric layer, and further, it is necessary to change the settings of power, speed, time and the like according to the change of the thickness of the thin film shield.

  Although it is not a technique for removing the thin film shield of ultra-fine coaxial cables, it has been proposed to use pulse discharge as a technique for removing the metal film provided on the resin surface from the resin for the purpose of resin recycling (for example, patents) Reference 3). This technique is a large area removal technique and requires a high voltage (5 to 15 kV).

JP 2000-244502 A JP-A-2005-328696 JP 2005-153492 A

  SUMMARY OF THE INVENTION The object of the present invention is to end a micro-fine coaxial cable that can be removed by melting and evaporating a thin-film shield, such as a copper thin film, at a low voltage, instantaneously, without damaging the dielectric layer. It is to provide a processing method.

  The present inventors have described a method in which a thin film shield such as a copper thin film of an ultrafine coaxial cable can be removed by melting and evaporating at a low voltage instantaneously without damaging the dielectric layer. As a result of intensive studies, a portion to be removed of the exposed thin film shield is disposed between the first electrode and the second electrode, and a pulse current is applied by contacting both the first electrode and the second electrode. The present inventors have found that the thin film shield can be removed by melting and evaporation.

That is, the terminal processing method of the ultrafine coaxial cable according to the present invention includes an inner conductor, a dielectric layer provided on the outer periphery of the inner conductor, and a thin film shield layer provided on the outer periphery of the dielectric layer. In a method for processing an ultra-fine coaxial cable by arranging a plurality of micro-coaxial cables in parallel and removing the thin-film shield, the portion to be removed of the thin-film shield is disposed between the first electrode and the second electrode; The first electrode and the second electrode are brought into contact with each other, the distance between the electrodes is set to 1 to 10 mm, and the pulse current per one ultrafine coaxial cable is set to 5 × 10 ^{−4 to 1} J. Thus, the thin film shield is melted and evaporated to be removed.

Further, the terminal processing method of the ultrafine coaxial cable of the present invention includes an inner conductor, a dielectric layer provided on the outer periphery of the inner conductor, a thin-film shield layer provided on the outer periphery of the dielectric layer, and the thin film A plurality of ultrafine coaxial cables having a protective coating layer provided on the outer periphery of the shield layer are arranged in parallel, and the protective coating layer at the end of the ultrafine coaxial cable is removed to expose the thin film shield. Then, in the terminal processing method of the ultrafine coaxial cable that removes the exposed thin film shield, a portion to be removed of the exposed thin film shield is disposed between the first electrode and the second electrode, and the first electrode And the second electrode is brought into contact with each other, the distance between the electrodes is set to 1 to 10 mm, and the amount of pulse current per one ultrafine coaxial cable is set to 5 × 10 ^{−4 to 1} J to flow the thin film. Melting shield Evaporated and removing it.

  With the method for processing an ultrafine coaxial cable according to the present invention, a thin film shield such as a copper thin film is instantaneously removed by melting and evaporating at a low voltage without damaging the dielectric layer in a single operation. be able to.

It is a schematic circuit diagram which shows one structural example of the pulse current generator used by implementation of the terminal processing method of this invention. It is a schematic explanatory drawing for demonstrating the embodiment of the terminal processing method of this invention.

  The ultrafine coaxial cable processed by the terminal processing method of the present invention has an inner conductor, a dielectric layer provided on the outer periphery of the inner conductor, and a thin film shield layer provided on the outer periphery of the dielectric layer. Or an inner conductor, a dielectric layer provided on the outer periphery of the inner conductor, a thin film shield layer such as a copper thin film provided on the outer periphery of the dielectric layer, and an outer periphery of the thin film shield layer A superfine coaxial cable having such a structure is well known, and the end of a well known ultrafine coaxial cable is processed in the present invention.

  In the terminal processing method of the present invention, in the case of an ultrafine coaxial cable having a protective coating layer, a plurality of such ultrafine coaxial cables are arranged in parallel, and a portion (connector) that becomes the end of the ultrafine coaxial cable And the exposed thin-film shield is removed, and then the exposed thin-film shield is removed. The method of removing the protective coating layer at the end of the ultrafine coaxial cable In the present invention, the protective coating layer at the end portion of the ultrafine coaxial cable is removed by a well-known method.

The terminal processing method of the present invention is characterized only by the method for removing the thin film shield of the ultrafine coaxial cable. The method for removing a thin film shield, which is a feature of the present invention, includes disposing a portion of the (exposed) thin film shield to be removed between the first electrode and the second electrode, and both the first electrode and the second electrode. The thin film shield is melted and evaporated by flowing the pulse current with the distance between the electrodes being 1 to 10 mm and the electric energy of the pulse current per one ultrafine coaxial cable being 5 × 10 ^{−4 to 1} J. Removing. The electric energy of the pulse current is a value calculated as 0.5 × (capacitor capacity, F) × (voltage, V) ² .

In the terminal processing method of the present invention, since a pulse current is used, an electric current of 5 × 10 ^{−4 to 1} J can be instantaneously passed through the thin film shield, and as a result, the thickness of the thin film shield is affected. The entire circumference of the thin-film shield between the first electrode and the second electrode can be instantaneously melted and evaporated without being removed, and even if such a current is passed, the instantaneous pulse current Therefore, the resin of the dielectric layer which is the base of the thin film shield is not deteriorated.

In the terminal processing method of the present invention, the condition for flowing the pulse current is the same as the length to be removed from the thin film shield, and is usually about 1 to 10 mm, preferably about 3 to 8 mm, more preferably 4 to 4 mm. It is about 7 mm. In addition, the electric energy of the pulse current per ultra-fine coaxial cable is 5 × 10 ^{−4 to 1} J, preferably 5 × 10 ^{−3 to} 5 × 10 ⁻¹ J, more preferably 2 × 10 ⁻² to 2 ×. It is about 10 ^-1 J. If the amount of pulsed current per ultra-fine coaxial cable is less than 5 × 10 ^-4 J, the removal of the thin-film shield tends to be incomplete, and conversely, per ultra-fine coaxial cable. When the electric energy of the pulse current exceeds 1 J, the resin of the dielectric layer that is the base of the thin film shield tends to be deteriorated. In addition, about the charging voltage for obtaining the electric energy of such a pulse current, it is about 100-1000V, Preferably it is about 400-600V, More preferably, it is about 450-550V. When the charging voltage exceeds 1000 V, the electrode wears out, and the resin of the dielectric layer underlying the thin film shield tends to deteriorate. Conversely, when the charging voltage is less than 100 V, removal failure tends to occur. . Moreover, there is no strict restriction | limiting about a capacitor | condenser capacity | capacitance, It is made for the electric energy of the pulse current per super fine coaxial cable to be 5 * 10 < ^-4 > -1J by correlation (inverse proportion) with charging voltage. That is, in order to reduce the charging voltage, it is necessary to increase the capacitor capacity.

The present invention will be described below with reference to the drawings.
FIG. 1 is a circuit diagram showing a configuration example of a pulse current generator used in the terminal processing method of the present invention, wherein 1 is a first electrode and 2 is a second electrode. FIG. 1 shows a case where the charging voltage is 0 to 1000 V and the capacitor capacity is 0.1 to 2.0 μF. Although the inter-electrode distance is not shown, the terminal processing was performed at 1 to 10 mm.

  The ultra-fine coaxial cable used for terminal processing is a dielectric layer made of a polymer alloy of polyamide and ABS resin on the outer periphery of an inner conductor with an outer diameter of 30 μm made of an in situ silver fiber reinforced copper alloy (silver content of about 10%). The outer diameter of the coated electric wire thus formed is etched with hydrochloric acid, and a thin-film shield layer (metal plating) made of copper is formed by electroless plating thereon. Layer). Since the subject of the terminal processing method of this invention is removal of a thin film shield, the terminal process was carried out about the ultrafine coaxial cable in the case where formation of a protective coating layer and removal of a protective coating layer are not performed.

  FIG. 2 is a schematic explanatory diagram for explaining an embodiment of the present invention. As shown in FIG. 2, the ten ultra-fine coaxial cables are arranged in parallel at a pitch of 0.3 mm, the portion to be removed of the thin film shield is disposed between the first electrode 1 and the second electrode 2, and the Both the first electrode 1 and the second electrode 2 were brought into contact. In FIG. 2, for the sake of simplicity, only two ultrafine coaxial cables at both ends of the ultrafine coaxial cables arranged in parallel are shown, and the other ultrafine coaxial cables in the middle are omitted.

With the arrangement as described above, the distance between the electrodes is changed between 1 to 10 mm, the charging voltage is changed between 0 to 1000 V, and the capacitor capacity is changed between 0.1 to 2.0 μF to change the pulse current. The state of removal of the thin film shield was observed. The electric energy of the pulse current is a value calculated as 0.5 × (capacitor capacity, F) × (voltage, V) ² . In FIG. 2, 3 is the ultrafine coaxial cable before the thin film shield is removed, and 4 is the ultrafine coaxial cable after the thin film shield is removed.

  The discharge conditions and the removal state when the above-described terminal processing is performed are as shown in Table 1. ○ in the column of the removal state indicates that the removal is complete, and × indicates that the removal is incomplete or affects the dielectric layer.

DESCRIPTION OF SYMBOLS 1 1st electrode 2 2nd electrode 3 Ultrafine coaxial cable before thin film shield is removed 4 Ultrafine coaxial cable after thin film shield is removed

Claims (3)

A plurality of ultrafine coaxial cables having an inner conductor, a dielectric layer provided on the outer periphery of the inner conductor, and a thin film shield layer provided on the outer periphery of the dielectric layer are arranged in parallel, In a method of processing an end of a superfine coaxial cable to be removed, a portion to be removed of the thin film shield is disposed between the first electrode and the second electrode, and is brought into contact with both the first electrode and the second electrode. The thin film shield is melted and evaporated to be removed by passing the pulse current with an inter-distance of 1 to 10 mm and a pulse current of 5 × 10 ^{−4 to 1} J per ultra-fine coaxial cable. A terminal processing method for a featured ultra-fine coaxial cable. An ultra conductor having an inner conductor, a dielectric layer provided on the outer periphery of the inner conductor, a thin film shield layer provided on the outer periphery of the dielectric layer, and a protective coating layer provided on the outer periphery of the thin film shield layer An ultra-fine coaxial cable in which a plurality of micro-coaxial cables are arranged in parallel and the thin-film shield is exposed by removing the protective coating layer at the end of the ultra-fine-coaxial cable and then removing the exposed thin-film shield In this terminal processing method, a portion to be removed of the exposed thin film shield is disposed between the first electrode and the second electrode and is brought into contact with both the first electrode and the second electrode. The thin-film shield is melted and evaporated to be removed by passing a pulse current with a pulse current of 5 × 10 ⁻⁴ to 1 J with a pulse current of 5 × 10 ^{−4 to 1} J. Ultra-fine coaxial cable Terminal processing method Le. The thin-film shield is melted and evaporated by passing the pulse current with a distance between the electrodes of 3 to 8 mm and a pulse current of 2 × 10 ⁻² to 2 × 10 ⁻¹ J per ultrafine coaxial cable. The method for processing an end of a super fine coaxial cable according to claim 1 or 2, wherein the terminal is removed.

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