JPH03226388A - Laser beam marking method - Google Patents

Abstract

PURPOSE:To prevent double irradiation and to uniformize marking by specifying laser beam marking of an intersection and its circumferential part when two straight or curved lines configuring a marking pattern intersect each other at an acute angle. CONSTITUTION:When two straight or curved lines configuring a laser beam marking pattern intersect each other at an acute angle, the spot interval and the marking speed between a place where the interval between the central lines of the lines A, B having line width W each makes a half the line width and an intersection 0 are made twice the value in the area except this area, thereby, the density of laser beam spots can be uniformized to obtain a uniform laser beam marking.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention reflects a laser beam by a roller attached to two galvanometer type optical scanners.
This invention relates to a method for marking a two-dimensional pattern, and in particular to a method for controlling a laser beam and a galvanometer-type optical scanner using software when the lines form an acute angle at the intersection of a pattern consisting of nine straight lines and nine circular arcs.

[Conventional technology]

Conventionally, Toki, which laser marks two-dimensional patterns,
At the intersection points of the pattern, when marking each line (straight circle or arc) that passes through these points, around these points, for all but one line, mark the line width away from the intersection point. Laser marking started from this point. Therefore, if the angle at which each line intersects is small, a certain part will be doubly irradiated.

[Problem to be solved by the invention]

According to the conventional laser marking method described above, if the lines forming these points intersect or connect at acute angles at the intersections of the patterns, double irradiation occurs, resulting in insufficient laser marking. This method has the disadvantage that it is not possible to obtain a uniform marking state, and the doubly irradiated area is machined more deeply than other areas.

[Means to solve the problem]

In the laser marking method of the present invention, L-za marking is performed in the following manner at the intersections of patterns composed of straight lines, P, circular arcs, and other curved lines and their vicinity. (shown in Figure 1) is a case in which two straight lines A and B of line width W intersect at point 0.As shown in the figure, the center layer of straight line A is the X axis, and point 0 is If the y-axis is set perpendicular to the X-axis, one edge to the straight line and a straight line parallel to the y-axis passing through the intersection point I of the center layer of the straight line B and the gap area C between the y-axis.
Now, the two straight lines A and B overlap greatly. Therefore, the bite size 2 outside this area (the distance between the centers of the laser spots that form a straight line) is b1? Assuming that the bite size in this area is b2, bz=2bI, and the laser spot weight is changed. However, in order not to change the processability, the laser frequency is the same inside and outside the area. By doing this, the density of the laser spot in the entire area within the two straight lines becomes hazy, and uniform laser marking becomes possible.

〔Example〕

FIG. 1 is a part of a pattern to be marked, and is an example in which two straight lines A and B intersect at a point O.

These straight lines are formed by a series of spots by moving the laser spot in the straight line direction while emitting the laser spot. The line width W of the straight line is determined depending on the diameter of the spot.

As shown in the figure, the X-axis and y-axis are determined, and two straight lines A and B of line width W are drawn, respectively, with y=0. Let y=ax. Letting I be the intersection between one edge of the straight line and the center line of the other straight line B, the coordinates of this intersection are expressed as I (-1°m-). −1≦
For spots in each straight line having centers within the range of X≦O, the distance between adjacent spots (bite size) is twice the bite size in the region of -8>X or x>0. In this region C, the entire spot forming both straight lines will cause the spots outside of this region to be distorted.

almost equal to the density of

In addition, if one of the two intersecting lines B is an arc or a circle, the intersection point I of the edge of the straight line and the center line of the arc B is the equation of the arc, as shown in Figure 2.
y+a)"=a space a: Regarding the spots in each line whose center is inside the circular arc, by making the distance bz (μm) between adjacent spots twice the size bs (μm), Spot density can be made almost equal (in the case of circular arcs, the bite size is defined as the length of the circular arc).

Since the machining state changes when the laser frequency is changed, it is maintained at a constant value f (KHz) over the entire range.

By the way, marking speed V (mm/s) = b (
The marking speed inside (μm) is twice that of the outside.

〔Effect of the invention〕

As explained above, the present invention enables laser marking of the pattern even at the intersection point and the surrounding area when these lines intersect at an acute angle in a general pattern consisting of a straight line or a circular arc. A ninth advantage of avoiding multiple laser beam irradiation as much as possible is that a more uniform processing state can be obtained even at acute angle intersection points and their surrounding areas.

[Brief explanation of drawings]

1 and 2 are diagrams showing a part of the laser marking pattern, and FIG. 1 is a diagram when a straight line person and a straight line B form an acute angle and intersect at point 0. Figure 2 shows a straight line person and arc B
This is a diagram where the tangent lines at intersection 0 intersect at an acute angle.

Claims (1)

[Claims] In the laser marking method, which draws a pattern on the workpiece by irradiating and scanning a laser spot on the workpiece,
When two straight or curved lines that make up the pattern to be laser marked intersect at an acute angle, the distance between the center lines of each line with line width w is from 1/2 of the line width to the point of intersection. A laser marking processing method characterized by doubling the spot spacing (bite size) and marking speed (scanning speed) between the two regions compared to values outside this region.