JPS63194887A - Head for laser beam machine - Google Patents

Abstract

PURPOSE:To improve the efficiency in cutting a high reflection factor material and the safety by arranging in order 1st and 2nd rectangular prisms and a condensing lens on a laser optical path and providing a laser light absorbing body at the opposite side of the 2nd rectangular prism as well. CONSTITUTION:A 1st rectangular prism 1st, 2nd rectangular prisms 1, 2 and condensing lens 3 are arranged in order from an incident side for the center axis 6 of a laser light and a laser light absorbing body 4 is arranged at the opposite side of the prism 2 between the prism 1 and lens 3 as well. The laser light 5 is made incident on the slope 1a of the prism 1 and slantly projected from the face 1b to perform the cutting of the body 8 to be worked via the prism 2 and lens 3. In this case, due to the reflecting lights 10b, 11b against laser lights 10a, 11a being absorbed to the laser light absorbing body 4 the danger based on the reflecting light is prevented. The working efficiency and safety of the material having high refrection factor are thus improved.

Description

[Detailed Description of the Invention] [Summary] The present invention utilizes two right-angled prisms, and a laser light absorber is provided to absorb the reflected light of the laser light for cutting, thereby producing a normal oscillating laser. A laser processing machine optical head capable of processing is provided.

[Industrial application field]

The present invention relates to an optical head of a laser processing machine for cutting sheet metal, and more particularly to an optical head of a laser processing machine that can cut copper, aluminum, etc., which have a high reflectance to laser light, with high precision and safely. .

[Conventional technology]

Sheet metal cutting using a laser, especially processing using a carbon dioxide gas laser, is beginning to be widely used because it enables high-speed, high-precision processing. However, when cutting materials such as copper and aluminum that have a high reflectance to laser light, the laser light reflected from the surface of the material to be cut returns to the laser oscillator, causing abnormal oscillation and damaging the oscillator and optical system. However, laser cutting is generally limited to materials with low reflectance, such as iron and stainless steel. Therefore, a laser processing machine that can safely cut materials with high reflectivity such as copper and aluminum is needed.

FIG. 2 shows a schematic diagram of the main parts of a conventional laser processing machine optical head.

As shown in FIG. 2, the conventional optical head has a structure in which a single condenser lens 3 is used to condense and irradiate a laser beam 10 from a direction perpendicular to the workpiece surface 8. .

[Problem that the invention seeks to solve]

The conventional optical head shown in Figure 2 has a structure that focuses and irradiates laser light from a direction perpendicular to the surface of the workpiece, so when processing materials with high reflectivity, the reflected laser light returns to the oscillator, causing damage to the oscillator and optical components (not shown).

[Means for solving problems]

According to the present invention, the above-mentioned problems are solved by the first rectangular prism (1) having a central axis and emitting parallel incident laser beams in an oblique direction and in parallel; a second rectangular prism (2) that is emitted parallel to the incident parallel light and provided on one side with respect to the central axis; and the parallel light emitted from the second rectangular prism. Condensing lenses (3) having a central axis that converges and coincides with the central axis are arranged in that order, and the first rectangular prism (1
) and a second right-angle prism, and further comprising a laser beam absorber (4) on the opposite side of the central axis to the side on which the second right-angle prism is provided. Solved by optical head.

That is, according to the invention, for example, two
The laser beam is shifted in parallel using two right-angle prisms, and the laser beam shifted from the center axis of the original laser beam is irradiated onto the surface of the workpiece using a condensing lens, and is used for processing such as cutting. A portion of the laser light reflected from the surface of the workpiece is absorbed by the laser light absorber passing through the condenser lens, so that the amount of reflected light 7 returning to the laser oscillator is greatly reduced.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

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

As shown in FIG. 1, a first right-angle prism 1, a second right-angle prism 2, and a condenser lens 3 are arranged in order with respect to a workpiece 8, and a first right-angle prism 1 and a condenser lens 3 are arranged in order with respect to a workpiece 8. A laser light absorber 4 is disposed between them.

A CO2 laser beam 5 having a central axis 6 enters the first rectangular prism 1 in parallel with a slope 1a1 having a certain inclination, and l
It is emitted obliquely and parallelly from the b-plane, enters the 2b-plane of the second right-angle prism 2, and from the 2b-plane parallel to the 1a-plane of the right-angle prism 1, the central axis 6 (the central axis of the condenser lens 3 and the laser beam The beam is emitted parallel to the central axis of
The light is focused on the cut plane A. Since the second right angle prism 2 is provided on the right side with respect to the central axis, for example, the laser beams IQa and lla emitted from the condenser lens 3 are reflected by the workpiece surface 8 and become reflected beams IQb and llb, which are reflected from the condenser lens 3. The laser beam is absorbed by the laser beam absorber 4 through the laser beam absorber 4. The laser light absorber 4 is provided on the opposite side of the central axis 6 from where the right angle prism 2 is provided, that is, on the left side, and has a structure that absorbs much reflected light with higher precision.

Note that this laser light absorber 4 is made of a metal oxide, a phosphoric acid compound, or the like.

〔Effect of the invention〕

As explained above, according to the present invention, the reflected light of the laser light for cutting the workpiece is absorbed by the laser light absorber, so that it is possible to prevent abnormal oscillation of the laser due to the reflected light. Therefore, it is possible to cut materials with high laser light reflectivity, such as copper and aluminum.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a schematic diagram of main parts showing an embodiment of the present invention, and FIG.
The figure is a schematic diagram of the main parts of a conventional laser processing machine optical head. 1.2...Right angle prism, la, 2a...Slope, 3...Condensing lens, 4
... Laser light absorber, 5, 10b, llb... Laser light, 6... Central axis, 7, 10b, llb... Reflected light, 8... Workpiece surface.

Claims (1)

[Claims] A first rectangular prism (1) having a central axis and emitting parallelly incident laser beams in an oblique direction and in parallel; a second rectangular prism (2) that is emitted parallel to the incident parallel light and provided on one side with respect to the central axis, and converges the parallel light emitted from the second rectangular prism; Condensing lenses (3) having central axes that coincide with the central axis are arranged in that order, and between the first right-angle prism (1) and the second right-angle prism and with respect to the central axis, the second condenser lens (3) is arranged in that order. An optical head for a laser processing machine, characterized in that a laser beam absorber (4) is provided on the side opposite to the side where the right-angle prism is provided.