JPH01146386A - Laser beam dump - Google Patents

Abstract

PURPOSE:To prevent the local concentration of laser beams, to obviate the elevation of the temperature of the inwall of a dump and to miniaturize a device and lengthen durability by constituting a cone for receiving light as a rotation symmetric body with a projecting section having roundness. CONSTITUTION:In a laser beam dump receiving laser beams 1 emitted from a laser oscillator and reflecting and absorbing them in the inside and emitting them to the outside as heat energy, a cone 3 for receiving them is organized as a rotation symmetric body with a projecting section having roundness. The cone 3 is formed to the rotation symmetric body with the circular projecting section having the radius of curvature R as shown in the figure. Consequently, laser beams 1 projected in the axial direction are reflected with extension from the surface of the cone 3 having a curvature, and the degree of concentration of laser beams applied to the inwall 5 of the dump is lowered, and energy density is reduced. Accordingly, the temperature rise of the inwall 5 of the dump is dropped and trouble such as burning, melting, etc., is removed, and a device is miniaturized and durability is lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in a laser beam dump that temporarily absorbs and removes a laser beam output from a laser oscillator.

(Prior Art) Fig. 2 shows a general arrangement of a laser beam dump that temporarily absorbs a laser beam output from a laser oscillator.

In FIG. 2, a laser beam 1 emitted from a high-output laser oscillator 6 for laser processing is directly projected onto a workpiece 7 during laser processing, and is shuttered inside a shutter box 9 during processing. The energy of the laser beam 1 is converted into thermal energy and is emitted to the outside via the cooling water 2.

An example of the conventional beam dump 4 is shown in cross-section in FIG.

In FIG. 3, a laser beam 1 is projected onto a mirror-finished conical cone 10, is reflected from its surface, hits the inner wall 5 of the dump truck, is absorbed as thermal energy, is cooled by cooling water 2, and is then exposed to the outside. is released.

(Problem to be Solved by the Invention) However, in the conventional laser beam dump described above, since the cone 10 has a conical cross-sectional shape as shown in FIG. The laser beam is locally concentrated on the surface of the dump inner wall 5, and therefore the dump inner wall 5 becomes locally high temperature, which may cause problems such as burnout and melting.

The present invention prevents local concentration of the laser beam by appropriately selecting the cross-sectional shape of the cone 10, thereby preventing the inner wall of the dump truck from becoming high temperature, thereby reducing the size of the device and improving durability. The purpose is to provide a laser beam dump that has been measured.

[Structure of the invention]

(Means and effects for solving the problems) The present invention provides a light receiving cone for a laser beam dump that receives a laser beam emitted from a laser oscillator, reflects and absorbs it internally, and emits it to the outside as thermal energy. The groove is formed as a rotationally symmetrical body with a rounded convex cross section, and the laser beam that is reflected and absorbed inside is diffused to lower the energy density, thereby suppressing the temperature rise inside the dump truck and preventing burnout, melting, etc. This is to prevent trouble from occurring.

(Example) An embodiment of the present invention is shown in FIG.

Fig. 1 is basically the same as the conventional Fig. 3, except that the cone 3 is different from the conventional conical cone 10 as shown in Fig. 4 (
It has a rounded cross section as shown in c).

That is, the cone 3 has a radius of curvature R as shown in FIG.
Since the laser beam 1 is a rotationally symmetric body with a circular convex cross section, the laser beam 1 projected in the axial direction is reflected from the surface of the cone 3 having a curvature with a wide spread, and is therefore irradiated onto the inner wall 5 of the dump truck. The degree of concentration of the laser beam is reduced and the energy density is reduced, thereby reducing the temperature rise of the dump inner wall 5, eliminating troubles such as burnout and melting, and making the device more compact and improving durability.

〔Effect of the invention〕

As explained above, according to the present invention, since the reflecting surface of the cone of the beam dump has a curvature, the reflected beam is diffused and the beam is not concentrated, so that the energy density received by the inner wall of the dump is reduced. This reduces temperature rise and reduces troubles such as burnout and melting, making it possible to downsize the device and improve its durability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a view showing the general arrangement of a beam dump for a laser oscillator, and FIG.
The figure is a sectional view showing an example of a conventional beam dump, and Figure 4 (
0 and 0 are diagrams each showing an example of the cross-sectional shape of a dumping cone according to the present invention and a conventional dumping cone. 1... Laser beam 2... Cooling water 3.10.
... Cone 4 ... Beam dump 5 ... Dump inner wall 6 ... Laser oscillator 7 ... Workpiece 8 ... Shutter mirror 9 ... Shutter box (8733) Agent Patent attorney Sho Inomata Akira (and 1 other person) Figure 1 Figure 2

Claims (1)

[Claims] In a laser beam dump that receives a laser beam emitted from a laser oscillator, reflects and absorbs it internally, and emits it to the outside as thermal energy, the cone for receiving the light is configured as a rotationally symmetrical body with a rounded convex cross section. Features a laser beam dump.