JPH08186918A - Method and apparatus for removing coating from coated wire - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a method and apparatus for removing a coating of a coated wire, which can remove the coating uniformly over the entire circumference of the coated wire with a simple configuration. [Structure] The coated wire 2 is irradiated with laser light, and
A concave mirror 3 is arranged behind the coated wire, and the concave mirror 3 is vibrated. The vibration of the concave mirror 3 is more than the distance corresponding to the diameter of the coated wire in the diameter direction of the coated wire which is perpendicular to the optical axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing the coating of a coated wire such as a wire having an extremely small diameter by irradiating a laser to remove the coating using the energy.

[0002]

2. Description of the Related Art In order to electrically connect covered wires to each other, it is necessary to remove the covering from the covered wires. Further, in the case of an ultrafine wire having a diameter of 46 μm or the like, it is difficult to mechanically remove the coating, and the energy is removed by laser irradiation.

FIG. 3 is a schematic view showing a conventional wire coating removing method. That is, as shown in FIG. 3A, the laser light is focused by the condenser lens 1 and the wire 2 is irradiated with the laser light. A concave mirror 3 is arranged at a position facing the condenser lens 1 with the wire 2 in the middle, and the optical axis of the concave mirror 3 coincides with that of the condenser lens 1.

As a result, the wire 2 is irradiated with the laser light from the condenser lens 1 either directly or after being reflected by the concave mirror 3, and the laser light source side (front side) portion and the opposite side (rear side) portion thereof are irradiated. The coating layer is removed by the irradiation of laser light.

However, even if the optical axes of the lens 1 and the concave mirror 3 are the same, if the wire 2 exists on this optical axis, the light incident on the concave mirror 3 will have a shadow of the wire 2. For this reason,
The rear surface of the wire 2 is not irradiated with laser light, and the coating layer cannot be removed.

Therefore, as shown in FIG. 3A, the wire 2 is moved perpendicularly to the optical axis, or as shown in FIG. 3B, the wire 3 is moved from the optical axes of the lens 1 and the concave mirror 3. The wire 2 is detached and arranged or, as shown in FIG. 3C, the optical axis of the lens 1 and the optical axis of the concave mirror 3 are displaced from each other.
The rear surface is also designed to be irradiated with laser light.

On the other hand, as shown in FIG. 4, there is a method in which two plane mirrors 4 are arranged behind the wire 2 and the rear surface of the wire 2 is irradiated with laser light by the two plane mirrors 4.

Further, as shown in FIG. 5, two laser oscillators 5 are provided on both sides of the front surface and the rear surface of the wire 2, and the front surface and the rear surface of the wire 2 are individually irradiated by the laser oscillator 5. There is.

FIG. 6 shows that the wire 2 can be irradiated over the entire circumference of the wire 2 by rotating the wire 2 in the laser irradiation light.

[0010]

However, these conventional methods have the following drawbacks. First, as shown in FIG. 3, with the method of reflecting the laser light by the concave mirror 3, it is difficult to remove the coating of a plurality of wires juxtaposed at a narrow pitch.

As shown in FIG. 7, when the lens 1 and the concave mirror 3 are arranged with their optical axes different from each other, when a plurality of wires 2 are arranged at a narrow pitch in the middle, as shown in FIG. A plurality of shadows 6 are generated on the laser light incident on the concave mirror 3. Therefore, in order to accurately irradiate the back surface of each wire 2 with the reflected light of the portion where the laser light in the middle of the shadow 6 is incident, the concave mirror 3 is moved with high accuracy with respect to the position of the wire 2. Need to let. However, in reality, this is extremely difficult, and when the plurality of wires 2 are juxtaposed at a narrow pitch in this way, it is difficult to remove the coating layer.

Further, as shown in FIG. 8, the wire 2 is bent vertically, and the wire 2 is simultaneously bent at two points A and B.
When the coating layer of 1 is removed, the wire 2 cannot be moved perpendicularly to the optical axis as shown in FIG.

Further, as shown in FIG. 4, two plane mirrors 4 are provided.
However, there is a problem in that there is a large variation in the density of the light that irradiates the back surface of the wire.

Furthermore, as shown in FIG. 5, when two laser oscillators 5 are used, there is a drawback that the equipment cost becomes high.

Furthermore, as shown in FIG. 6, the method of rotating the wire 2 is as shown in FIG.
If the wire is bent and the coating is removed at a plurality of positions at the same time, it is difficult to rotate the wire 2 and therefore it cannot be applied.

The present invention has been made in view of the above problems, and provides a method and apparatus for removing the coating of a coated wire, which is capable of uniformly removing the coating over the entire circumference of the coated wire with a simple structure. With the goal.

[0017]

According to the method for removing coating of a coated wire according to the present invention, the coated wire is irradiated with a laser beam, and a concave mirror is arranged behind the coated wire. It is characterized in that it is vertical and vibrates in the diameter direction of the coated wire by a distance equal to or larger than the diameter of the coated wire.

The coated wire coating removing apparatus according to the present invention comprises a laser beam irradiation means for irradiating a laser beam, a concave mirror for reflecting the laser beam, and the concave mirror, for example, in a direction perpendicular to the optical axis. It is characterized by having a driving means for vibrating the coated wire in the diameter direction by a distance equal to or larger than the diameter of the coated wire.

[0019]

In the present invention, a concave mirror is arranged behind the wire in the laser irradiation method for the coated wire, and the concave mirror corresponds to the diameter of the coated wire in the direction perpendicular to the optical axis and in the diameter direction of the coated wire. Vibrate the distance you want. As a result, the reflected light from the concave mirror also vibrates, and even if there is a shadow, the vibration of the reflective mirror uniformly irradiates the back surface of the wire with laser light. Thereby, the coating layer of the coated wire can be uniformly removed over the entire circumference.

The vibration of the concave mirror is to shift the shadow position of the wire formed on the concave mirror, and the shadow size of the wire is the same as the wire diameter. Therefore, the vibration distance of the concave mirror may be equal to the wire diameter. In this case, the vibration direction of the concave mirror is not limited to the diametrical direction of the cable, which is perpendicular to the optical axis, and may be the direction inclined from this direction. However, the moving distance needs to be equal to or longer than the distance corresponding to the wire diameter when projected in the diameter direction of the cable, which is perpendicular to the optical axis.

The removal of the coating of the coated wire by the laser beam is determined by the number of laser shots and the power density. The number of shots is determined by the laser irradiation time and the number of times (frequency) the irradiation is repeated. Therefore, the moving speed of the concave mirror is (moving distance / irradiation time). The beam diameter of the laser light is determined by the length or width of the portion where the coating is desired to be removed.

[0022]

Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. As shown in FIG. 1, a condenser lens 1 for focusing laser light and a concave mirror 3 are arranged with their optical axes aligned, and a wire 2 is positioned between the lens 1 and the concave mirror 3. Then, the concave mirror 3 is replaced with the lens 1 and the concave mirror 3.
The wire 2 is vibrated perpendicularly to the optical axis of the wire.
As a result, the laser light reflected by the concave mirror 3 also vibrates, the shadow part of the wire 2 in the concave mirror 3 also vibrates, and the rear surface of the wire 2 is also uniformly irradiated with the laser light. Therefore, the coating layer of the wire 2 is uniformly removed over the entire circumference thereof.

FIG. 2 is a view showing another embodiment of the present invention, FIG. 2 (a) is a plan view showing a bent state of the wire 2, and FIG. 2 (b) shows a method for removing the coating of the wire 2. It is a typical perspective view shown. In this embodiment, the wire 2-2
A set of the focusing lens 1 and the concave mirror 3 is arranged at each of the points A and B, and the concave mirror 3 is vibrated in a direction perpendicular to the optical axis. In this case, since the vibrating direction is the diameter direction of the wire 2, 2 The vibrating directions of the concave mirror 3 at the points A and B are directions orthogonal to each other, as shown in FIG.

As described above, according to the present invention, even when the wire 2 is bent, the coating layer can be simultaneously removed at a plurality of points on the wire 2.

[0025]

According to the present invention, since the concave mirror is vibrated, it is possible to uniformly irradiate the laser beam without causing a shadow on the rear surface of the covered wire. Further, even when a plurality of covered wires are arranged at a narrow pitch and when the covered wires are bent and the covering is simultaneously removed at a plurality of places, the covering can be uniformly removed over the entire circumference. Furthermore,
Equipment cost is low because only one laser oscillator is required.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of the present invention.

FIG. 2 is a schematic view showing another embodiment of the present invention.

FIG. 3 is a schematic view showing a conventional wire coating removing method.

FIG. 4 is a schematic diagram showing another conventional wire coating removing method.

FIG. 5 is a schematic view showing still another conventional wire coating removing method.

FIG. 6 is a schematic view showing still another conventional wire coating removing method.

FIG. 7 is a diagram illustrating a drawback of the conventional method shown in FIG.

FIG. 8 is a diagram for explaining another drawback similarly.

[Explanation of symbols]

 1; focusing lens 2; wire 3; concave mirror 4; plane mirror 5; laser oscillator 6; shadow

Claims (4)

[Claims] 1. A method of removing coating from a coated wire, which comprises irradiating a coated wire with laser light, arranging a concave mirror behind the coated wire, and vibrating the concave mirror. 2. The coated wire according to claim 1, wherein the vibration of the concave mirror is equal to or larger than a distance corresponding to a diameter of the coated wire in a diameter direction of the coated wire which is perpendicular to the optical axis. Coating removal method. 3. An apparatus for removing coating of a coated wire, comprising: a laser beam irradiating unit for irradiating a laser beam; a concave mirror for reflecting the laser beam; and a driving unit for vibrating the concave mirror. 4. The driving means vibrates the concave mirror perpendicular to the optical axis and in the diameter direction of the coated wire by a distance equal to or larger than the diameter of the coated wire. Coating removal device for coated wires.