JPH0957472A - Laser marking method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser marking method capable of easily improving the recognition of marking so as to be made easy to see. SOLUTION: A laser beam LB emitted from a laser beam generator 1 is converged by a condensing lens 5 consisting of a cylindrical lens, and then, a work W is irradiated with this converged laser beam LB so that a broad rectangular marking is performed on the work W. In addition, after the convergence by the condensing lens 5 consisting of a convex lens, the focal distance is changed by a position-adjustable convex lens 11, or, after the convergence by the condensing lens 5 consisting of a cylindrical lens or a convex lens, the laser beam LB is diffused by a concave lens 13 and emitted on the work W for marking, enabling a broad round or rectangular marking which is easy to see.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser marking method for marking a work by irradiating the work with a laser beam emitted from a laser oscillator.

[0002]

2. Description of the Related Art Conventionally, as a laser processing apparatus, as shown in FIG. 5, for example, a laser beam LB oscillated from a laser oscillator 101 is reflected by a bend mirror 103 and then a condenser lens composed of a convex lens. It is condensed at 105. The focused laser beam LB is used for the table 10
It is irradiated toward the work W placed on the work 7, and the work W is cut or welded by the laser beam LB.

[0003]

By the way, in the above-mentioned conventional laser processing apparatus, when marking the work W, the focal length is left unchanged as in the case of cutting or welding. Marking is performed by weakening the output of LB so that the work W is not cut or melted.

However, under such conditions, for example, H
When a workpiece W such as a shaped steel is marked, since the marking is performed only by the round spot focus of the laser beam LB, there is a problem that the marking is thin and difficult to see.

An object of the present invention is to provide a laser marking method in which the recognition of markings can be easily improved to make them look better.

[0006]

In order to achieve the above object, a laser marking method of the present invention according to claim 1 is
The laser beam oscillated from the laser oscillator is condensed by a condenser lens composed of a cylindrical lens, and the workpiece is irradiated with the condensed laser beam to mark the workpiece.

In the above structure, the laser beam oscillated from the laser oscillator is condensed by the condenser lens composed of the cylindrical lens. By irradiating the work with the focused laser beam, linear marking is performed on the work, so that the recognition of the marking is easily improved and becomes better than that of the conventional dot-shaped marking.

According to a second aspect of the laser marking method of the present invention, after the laser beam oscillated from the laser oscillator is condensed by a condenser lens composed of a convex lens, the focal length is further changed by a convex lens whose position can be adjusted, Alternatively, it is characterized in that after the light is condensed by a condenser lens composed of a cylindrical lens or a convex lens, it is diffused by a concave lens and then the work is irradiated with this laser beam to mark the work.

In the above structure, the laser beam oscillated from the laser oscillator is condensed by the condenser lens composed of a convex lens. This focused laser beam is focused by a convex lens whose position is further adjusted, and then irradiated onto the workpiece to perform thick circular marking processing on the workpiece, so compared to conventional dot marking. The recognition of markings is easily improved and looks better.

Further, when a work is irradiated with light after being condensed by a condensing lens composed of a cylindrical lens or a convex lens and then diffused by a concave lens, a thick rectangular shape or a thick circular shape is marked on the work. As compared to the conventional dot-shaped marking, the recognition of the marking can be easily improved and can be seen better.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a laser beam LB oscillated from a laser oscillator 1 is reflected by a bend mirror 3 and condensed by a condenser lens 5 composed of a cylindrical lens. Laser beam LB condensed by this condenser lens 5
Is irradiated toward the workpiece W placed on the table 7, the linear marking M is applied to the portion irradiated on the workpiece W.
Is done.

Marking is performed without making the output of the laser beam LB at this time much weaker than in the conventional cutting or welding process, and without cutting or melting the work W even if the focus remains. As compared with the conventional dot-shaped marking, the recognition can be easily improved and the marking can be easily seen.

An example of another embodiment is shown in FIGS. 2, 3 and 4. In FIGS. 2, 3 and 4, the same parts as those in FIG. 1 are designated by the same reference numerals, and a duplicate description will be omitted.

In FIG. 2, a convex lens 11 whose position can be adjusted by a plurality of springs 9 is provided below the condenser lens 5 which is a convex lens.

With the above structure, the laser beam LB reflected by the bend mirror 3 is a condenser lens 5 made of a convex lens.
After the light is collected by (1), it is further collected by the convex lens 11 and is irradiated toward the work W, so that the thick mark M can be applied to the part where the work W is irradiated. Therefore, the same effect as that of FIG. 1 is achieved except that thick circular marking can be obtained without changing the position of the condenser lens 5.

In FIG. 3, a concave lens 13 is provided below the condenser lens 5 made of a cylindrical lens.

With the above structure, the laser beam LB condensed by the condenser lens 5 made of a cylindrical lens is
Since the light is diffused by the concave lens 13 and irradiated toward the work W, it is possible to perform marking with a thick rectangular shape on the portion where the work W is irradiated. Therefore, the condenser lens 5
The same effect as that of FIG. 1 is obtained except that a thick rectangular marking can be obtained without changing the position of.

In FIG. 4, a concave lens 13 is provided below the condenser lens 5 which is a convex lens.

With the above configuration, the laser beam LB condensed by the condenser lens 5 composed of a convex lens is converted into the concave lens 13
Since the light is diffused and irradiated toward the work W, it is possible to perform marking with a thick circle on the part irradiated onto the work W. Therefore, the same effect as that of FIG. 1 is achieved except that thick circular marking can be obtained without changing the position of the condenser lens 5.

The present invention is not limited to the examples of the embodiments described above, but can be implemented in other modes by making appropriate changes.

[0022]

As will be understood from the examples of the embodiment as described above, according to the inventions of claims 1 and 2, it is possible to carry out marking in a circular or rectangular shape thicker than the conventional one. Moreover, marking is performed without weakening the output of the laser beam so much as compared with conventional cutting or welding processing, and without cutting or melting the work even if the focus remains the same as conventional dot marking. In comparison, the recognition can be easily improved and the marking can be seen better.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for performing laser marking according to the present invention.

FIG. 2 is an explanatory diagram for performing another laser marking in place of FIG.

FIG. 3 is an explanatory diagram for performing another laser marking in place of FIG.

FIG. 4 is an explanatory diagram for performing another laser marking in place of FIG.

FIG. 5 is an explanatory diagram of performing laser processing on a conventional work.

[Explanation of symbols]

 1 Laser Oscillator 3 Bend Mirror 5 Condenser Lens 7 Table 9 Spring 11 Convex Lens 13 Concave Lens

Claims (2)

[Claims] 1. A laser beam oscillated from a laser oscillator is condensed by a condenser lens composed of a cylindrical lens, and the workpiece is irradiated with the condensed laser beam to mark the workpiece. Laser marking method. 2. A laser beam oscillated from a laser oscillator is condensed by a condenser lens composed of a convex lens, and then the focal length is changed by a convex lens whose position is adjustable, or a cylindrical lens or a condenser lens composed of a convex lens. The laser marking method is characterized in that after the light is focused by, the light is diffused by a concave lens, and then the work is irradiated with this laser beam to perform marking on the work.