JPH03165992A - Beam emitting apparatus for laser beam machining - Google Patents

Abstract

PURPOSE:To condense one laser beam to two points at interval of the specific distance at the same time and to finely control the ratio of laser beam powers at the two points by arranging a collimator lens, wedge shaped transparent body, filter and condenser lens to a beam emitting apparatus for laser beam machining. CONSTITUTION:The laser beam from a laser beam generator is transmitted to a beam emitting unit body 1 for laser beam machining with optical fiber 2. The laser beam transmitted from the optical fiber 2 is divided into the specific two directions with the wedge shaped transparent body 4 whose a beam incident face is perpendicular to the laser beam and the emitting face has the specific inclined angle, after converted to the parallel laser beam with the collimator lens 3. By varying the inclined angle of emitting face in the wedge shaped transparent body 4, the parallel laser beam is divided into two laser beams having the specific angle based on the inclined angle of wedge shaped transparent body 4. The filter 5 where a part of the laser beam at one direction of the laser beams divided into the specific two directions is attenuated, is put behind of the transparent body 4. The laser beams divided into the specific two directions are condensed into two points with the condenser lens 6.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an output device for laser processing, and in particular to a device that can focus a laser beam transmitted from a laser oscillator to an optical fiber onto two points and finely adjust the power ratio. Regarding.

[Conventional technology]

Conventionally, this type of laser processing output device has a collimator lens 3 that receives a laser beam transmitted from a laser oscillator to an optical fiber 2 and converts it into a parallel laser beam, as shown in FIG. The lens 7 has a plurality of condensing lenses that receive a laser beam and are integrally assembled with a plurality of condensing lenses whose parts are cut to include the optical axis of the spherical lens (for example, Japanese Patent Publication No. 54-39334). Since each lens 7 has an independent focal point, it has a plurality of focal points. That is, one laser beam emitted from a laser oscillator can be focused on two or more irradiation points at the same time by combining partial lenses.

[Problem to be solved by the invention]

The conventional laser processing output device described above includes a collimator lens that converts the laser beam into parallel light beams, and a collimator lens that includes the optical axis of the spherical lens in order to simultaneously focus one laser beam on two or more irradiation points. It was difficult to assemble a plurality of partially cut condensing lenses into one.

[Means to solve the problem]

The output device for laser processing of the present invention has a collimator lens that converts a laser beam transmitted from a laser oscillator to an optical fiber into a parallel beam, and a wedge-shaped transparent body that divides the parallel beam into two specific directions. It includes a filter that partially attenuates the laser beam in one direction, and a condenser lens that focuses the laser beam split into two directions at two points.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an output device for laser processing according to an embodiment of the present invention.

In the figure, the laser beam (1.0
The Nd:YAG laser beam of 6.0 um is transmitted through an optical fiber 2 to the main body 1 of the laser processing output unit.

The laser beam transmitted from the optical fiber 2 is converted into a parallel laser beam by a collimator lens 3, and then is converted into a parallel laser beam by a wedge-shaped transparent body 4 whose light incident surface is perpendicular to the laser beam and whose output surface has a specific inclination angle. It splits into two directions. By changing the inclination angle of the output surface of the wedge-shaped transparent body 4, the parallel laser beam is split into two laser beams having a specific angle based on the inclination angle of the wedge-shaped transparent body 4. A filter 5 that partially attenuates the laser beam in one direction of the laser beam split into two specific directions is placed after the wedge-shaped transparent body. Reflective coated, one side l.
Prepare three types: one with anti-reflection coating for 06μm and one without anti-reflection coating. The reflectance of the three types of filters for 1.06/JmNd:YAG laser light is approximately 1% for the one with anti-reflection coating for 1.06 μm on both sides, and approximately 4% for the one with anti-reflection coating for 1.06 μm on one side. , about 8% without anti-reflection coating. The arrangement order of each filter may be arbitrary. The laser beam split into two specific directions is focused on two points by a condenser lens 6.

〔Effect of the invention〕

As explained above, the present invention provides an output device for laser processing with a collimator lens, a wedge-shaped transparent body, a filter, and a condensing lens.
It has the effect that the laser beam of a book is simultaneously focused on two points separated by a specific distance, and the laser power ratio of the two points can be varied in steps of about 1%.

4

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of an output device for laser processing according to an embodiment of the present invention, and FIG. 2 is a sectional view showing the structure of a conventional output device for laser processing. 5 l...Emission device main body for laser processing, 2...
...Optical fiber 3...Collimation lens, 4...Wedge board, 5...Filter, 6...Condensing lens, 7...・Combination Runs.

Claims (1)

[Claims] A collimator lens that converts the laser beam transmitted from the laser oscillator to the optical fiber into a parallel beam, and a wedge-shaped transparent body that receives the laser beam from the collimator lens and divides the parallel beam into two specific directions. a filter that attenuates a laser beam in one direction of the laser beam, and a condensing lens that focuses the laser beam that has passed through the filter and the one that has not passed through the filter among the two directions of the laser beam. An output device for laser processing characterized by: