JPS60247490A - Branching device of laser beam - Google Patents

Abstract

PURPOSE:To speed up the changeover of a laser beam and to miniaturize the device by making plural incident parts movable and by making in order the laser beam emitted from a fixed optical converging part incident to an incident part. CONSTITUTION:A base 5 having numeous optical fiber connectors is provided on a table 6X-Y. The table 6 is freely movable on the same plane by pulse motors 7, 8 for an axis X, axis Y. A laser beam 2 is condensed to one of connectors C of the base 5 via a mirror M and condenser lens L and passing through an optical fiber cable A it is emitted from a connector B. The laser beam reaches further a welding point via the lens L. The pulse motors 7, 8 move the table 6 by the number of pulses prescribed in advance, moving in order a connector C. Due to no movement of the mirror M a high speed changeover is enabled and the device can be miniaturized as well.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a laser beam branching device for branching laser beams.

[Technical Background of the Invention] In recent years, a laser welding method using laser light has been frequently used in place of the conventional resistance welding method for welding, for example, electron gun parts.

In such a laser welding method, a mirror is conventionally used to branch the laser beam, and the laser beam is branched by moving the mirror using a cylinder, a solenoid, or the like.

Figure 2 shows a conventional laser beam branching device used for welding a valve spacer to a convergence h-tube, for example. In this laser beam branching device, two laser beams emitted from a laser oscillator 1 are first M
+ is reflected, passes through a condenser lens L1, and enters an optical fiber cable A1 connected to an optical fiber connector C1.

Laser light 2 incident into optical fiber cable A1
is emitted from the optical fiber = 1 connector B+ that passes through this optical fiber cable A1 and is placed at the output part, and then the rape light 2 is split into two by the splitting lens L, and then the bulb spacer -4
guided to the welding point.

After the radar welding using the mirror M1 is completed, the mirror M+ is moved to the position indicated by the broken line in the figure, and the laser beam 2 from the laser oscillator 1 is guided to the adjacent mirror M2, and the laser beam 2 is guided to the adjacent convergence cup 3. Valve spacer to
4 laser welding is performed.

Thereafter, welding using mirrors M3, M4, etc. is performed in sequence, and after welding using mirror M6 is completed, mirrors M1...M7 are simultaneously returned to their original positions shown by solid lines,
Laser light 2 is sequentially guided again from mirror M1 to perform welding. Note that the mirrors M+...M7 are movable, the mirror M8 is fixed, and all of them are total reflection mirrors.

[Intermediate point 1 of the foreground technology However, the laser beam branching device configured as described above has the following drawbacks.

(1) If the mirror is switched at a high speed of, for example, 0.4 seconds or more, the mirror will shake, and the mirror will need to be moved a distance outside the mirror, for example, about 20 my or more.
High-speed switching is difficult.

(2) Mirrors M1...M are placed on the central axis of the laser beam 2.
8 must be placed accurately.

(3) The spread of laser beam 2 is mirror M+ and M, +(”
is different.

(4) A large number of mirrors and condensing lenses are required, and it is difficult to align the optical axes of the respective laser beams, making maintenance extremely difficult.

(5) Since there are many parts such as mirrors and condensing lenses, the laser beam branching device becomes very large-scale.

[Object of the Invention] The present invention has been made to address the problems of the prior art, and provides a laser beam branching device that enables high-speed switching of laser beams, easy maintenance, and miniaturization of aA@. This is what we are trying to provide.

[Summary of the Invention Ta 1 That is, the present invention includes a light converging section that collects and emits the sear oscillation light, and a light converging section that collects and emits the sear oscillation light, and a light converging section that is connected to one end of an optical fiber cable and collects the light from the light converging section into the optical fiber couple. At A3, the light collection part is fixed to a laser beam branching device comprising a plurality of input parts into which optical laser light is input, and a plurality of output parts which output the laser light transmitted by the optical laser beam), The laser beam branching device is characterized in that each of the plurality of entrance portions is movable and the condensed radar light from the light collection portion is sequentially incident on these entrance portions.

[Embodiment of the Invention] An embodiment of the invention will be described above with details shown in the drawings.

FIG. 1 is a polygon diagram showing one embodiment of the radar optical branching device of the present invention, and in the figure, reference numeral 1 indicates a radar I7'-oscillator. Laser oscillator 1 is located in front of radar oscillator 1.
A mirror M that reflects the laser beam 2 oscillated from the mirror M and a condenser lens that condenses the laser oscillation beam reflected by the mirror M are provided. In front of the condensing lens [, a base 5 is disposed in which a number of optical fibers, which are input parts, are disposed.

This base 5 is placed on an X-Y table 6, and is movable within the same plane by a pulse motor 7 for X-axis movement and a pulse motor 8 for Y-axis movement.

One end of an optical fiber cable A is connected to each optical fiber connector C, and the other end of the optical fiber cable is connected to an optical fiber connector B, which is an output part.
It is connected to the. Each fiber optic connector 1
A pair of lenses 1- for dividing the Rayleigh light 2 into two is arranged in front of the lens L, and a convergence r is arranged in front of this lens L.
A valve stub 3 and a valve spacer 4 are provided.

Figure 3 shows the details of the base 5 that accepts the optical fiber connector C (=JG).
Optical fiber connectors C+...08 are fixed. These nine fiber connectors C are arranged so that the gap between the centers of the optical fiber connectors C is equal to that of the adjacent optical fiber connectors C.

In the figure, reference numeral 7 indicates an X-axis movement pulse motor that moves the base 5 in the X-axis direction (horizontal direction in the figure).
Further, reference numeral 8 indicates a pulse controller for Y-axis movement that moves the base 5 in the Y-axis direction (vertical direction in the figure).

In the laser beam branching KPF configured as above, the laser beam 2 emitted from the laser oscillator 1 is redirected by the total reflection mirror M as shown in FIG.
The light is focused by a condensing lens onto one of the optical fiber connectors C disposed on the base 5, passes through the optical fiber cable 8, and is emitted from the optical fiber connector B.

The radar light 2 emitted from the optical fiber connector B is split into two parts by a splitting lens, and then reaches the welding point of the valve spacer 4 to the two-litre radiation cup 3, where the two points are simultaneously welded. Perform welding.

In addition, the movement of the X-Y i-pull 6 is performed by moving the pulse motor 7 for X-axis movement and the pulse motor 98 for Y-axis movement by a preset number of pulses. By connecting 8 optical fiber connectors C1...CB
in order from C1 position in Figure 3 to C2, C3, C4, C1
, C6, C7, 0 days, C1, and as a result, the optical fiber connector C is sequentially moved, and the laser beam oscillated from the f-oscillator 1 is transmitted through the eight optical fiber connectors C1... - Branches sequentially to C8 and reaches each welding point.

The laser beam optical axis between the condenser lens L and the optical fiber connector C is aligned using the pulse motor 7 for X-axis movement.
This can be easily done by changing the set number of pulses of the pulse motor 8 for Y-axis movement.

In the laser beam branching device configured as described above, the optical fiber connector C is arranged on the base 50, and this base 5 is moved, so that it is not necessary to move the mirror M, and the mirror M can be moved during high-speed switching. It is possible to prevent the runout that had previously occurred, and it is possible to perform high-speed switching reliably and easily.

In addition, in the laser beam branching device of the above-described embodiment, the arrangement of the optical fiber connector C arranged on the base 5 is as follows.
Since it is configured as shown in FIG. 3, the amount of movement can be set to eight, for example, and the movement distance of the mirror M can be significantly reduced compared to the conventional one.

[Effect of the invention 1 As described above, according to the laser beam branching device of the present invention, since the optical fiber connector which is the input part is moved, there is no need to move the mirror, and this eliminates the need for moving the mirror, which conventionally occurs due to the movement of the mirror. It is possible to eliminate the shake of the mirror,
High-speed switching can be easily performed.

Furthermore, the number of parts such as mirrors and condensing lenses can be reduced, and as a result, maintenance becomes easier and the device can be made more compact.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of the laser beam branching device of the present invention, FIG. 2 is an explanatory diagram showing a conventional laser beam branching device, and FIG. 1 is a top view showing details of the connector. 1......Laser oscillator 7.8...
・・・・Pulse motor A・・・・・・・・・・Optical fiber cable B,
C...Optical fiber m: 1 connector...
・・・・・・Patent attorney representing condensing lens Sasa Suyama −

Claims (3)

[Claims] (1) a light collecting section that collects laser oscillation light; and a plurality of incidence sections that are each connected to one end of an optical fiber cable and input the collected laser light from the light collecting section into the optical fiber cable; In the laser beam branching device comprising a plurality of output parts that output laser light transmitted by the optical fiber cable, the light collection part is fixed, the plurality of input parts are respectively movable, and these input parts A laser beam branching device characterized in that the condensing sheet light from the condensing section is sequentially incident on the condensing sheet. (2) The laser beam branching device according to claim 1, wherein the plurality of incident parts are arranged on the same movable base. (3) The laser beam branching device according to claim 2, wherein the base is moved by driving a pulse motor.