JPH03254385A - Marking method by laser - Google Patents

Abstract

PURPOSE:To prevent the multiple irradiation by marking a base line at the time of forming a point in which pattern lines consisting of a straight line and a circle cross at an acute angle, and setting a point which becomes 1/2 of line width of a line of length of a perpendicular allowed to descend to this base line from a point on the line, as a marking start point. CONSTITUTION:When two pieces or more of lines (straight line, circle or circular arc) cross at one point, or form a tangent, one piece of line executes laser marking in accordance with a pattern. This line is called a base line. In other line than the base line, a point in which length of a perpendicular allowed to descend to the base line from a point on its line becomes 1/2 of line width W of the line to which marking is executed actually is set as a marking start position. In the case of a point 4 in which an intersection of the perpendicular and the base line does not exist, a point 3 shifted to the inside of the line on the marking line by a line width portion from a connecting point becomes the marking start point. In such a way, the intersection and the connecting point are not shot two times, and working is executed more uniformly.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention reflects a laser beam by mirrors attached to two galvanometer type optical scanners.
The present invention relates to a marking processing method using a laser beam for marking a two-dimensional pattern.

[Conventional technology]

Traditionally, when laser marking two-dimensional patterns, one line is used at the intersection or connection points of the pattern to prevent these points from being hit twice by marking each line passing through these points. For other than that, laser marking was started from a point on the line that was separated by the line width from the intersection point. Therefore, when the angle at which each line intersects is small, the effect of preventing double shots is also small.

[Problem to be solved by the invention]

According to the above-mentioned conventional laser marking processing method, if the lines forming the intersection or connection point of the patterns intersect at an acute angle, but are connected, there will be a portion that is shot twice and the lines forming the intersection or connection point will be sufficiently uniform. Since it is not possible to obtain accurate marking conditions, the disadvantage is that the marking is deeper than other parts.

In contrast to the conventional single-stroke laser marking processing method, the present invention is capable of marking points where these lines intersect or connect at an acute angle in an arbitrary pattern consisting of straight lines, circles, or arcs, and the surrounding areas thereof. The present invention also provides a laser marking processing method that can obtain a more uniform processing state by avoiding multiple irradiation with laser light as much as possible.

[Means to solve the problem]

The present invention provides a laser marking method for marking a two-dimensional pattern by controlling the rotation angle and speed of mirrors attached to two galvanometer-type optical scanners that reflect laser light.
When forming a point or connection point where these pattern lines intersect at an acute angle in an arbitrary pattern consisting of circles or arcs, mark one line that will serve as the base line, and mark it from a point on the line other than the base line. This is a laser marking method in which the marking start point for lines other than the base line is set at a point where the length of a perpendicular line dropped to this base line is 1/2 of the line width of the line to be actually marked.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

1 to 3 are explanatory views of one embodiment of the present invention, respectively.

In the laser marking processing method of the present invention, at an intersection or connection point in a pattern consisting of a straight line, a circle, or an arc, any of the tangents of the straight line and the circle or arc at those points meet the intersection or connection point. When forming, the starting point of the marking line is determined using the following algorithm.

That is, when two or more lines (straight line, circle, or arc) intersect at one point or form a tangent, one line is laser marked according to the pattern. For lines other than the 6 base lines, which are called base lines, select the point where the length of the perpendicular line drawn from a point on the line to the base line is 1/2 of the line width W of the line to be actually marked. Marking start position. If there is no intersection between the perpendicular line and the base line (point 4 in Figure 1), the marking start point is point 3, which is shifted from the connecting point by the line width to the inside of the line. do.

In this way, we do not shoot twice at intersections and connection points, and by avoiding repeated shots to the surrounding area as much as possible without damaging the original connection state of the pattern,
More uniform processing is possible.

FIG. 2 is a diagram showing the marking pattern, which consists of three lines. When marking this pattern, the line width varies depending on the processing conditions and the type of workpiece, so it is not zero (from several tens of μm to about 200 μm), so in reality it is a pattern with an area like the shaded area in Figure 1. is drawn.

In FIG. 1, arc 1-4 has intersection point 1 and connection point 4. In FIG. By marking straight line 5-6, circular arc 1-4 and straight line 4-7, line segment 5-6 is marked as specified to prevent deeper machining around the intersection and connection points, but the circular arc Regarding 1-4, point 2 is on the arc and the length of the perpendicular descending from line segment 56 is W/2 (W: line width), and point 3 is shifted on the arc by W from the end point 4. Mark the connected arc 2-3.

When a straight line and a circular arc intersect as shown in Figure 2, the point (x, y) where the length of the perpendicular drawn from point 2 on the circular arc to the straight line is W/2 is determined as follows. is required.

α: Inclination of straight line 5-6 (p, q): Intersection or contact point of straight line 5-6 and arc 1-4 r: Radius of arc 1"4 (Xo, 310): Center of arc 1-4, Point (x, y) on arc 1-4 is (X, y) = (rc
osβ+x(,,rsinβ+yo)・・・・・・・・・
・(1) The length l of the perpendicular line drawn from this to the straight line et al.-6 is expressed as follows.

1= [1tana (rcosβ+XQ) −(
rstnβ+310 ) -ptan α +q
l ] /r (tan 2α + 1
),, β= a − arcsin [±l+ (P
X□) sin a+(q-yo)cosα] /r
−・・・・・・・・・−+21(Substitute ■ into (1) and (x
, y) is obtained.

As shown in Figure 3, when two straight lines intersect, the length l of the perpendicular drawn from one straight line 4-7 to the other straight line 5-6 is W.
The point (x, y) such that /2 is found as follows.

α: Slope of straight line 5-6 β: Direction I! 4 7 slope (p, q): If the intersection of straight line 5-6 and straight line 4-7, then 1=W/2= (l xtan ay-ptan a
+q l ) / ((tan2α+ 1 ) ---
(3) Also, since (x, y) is a point on the straight line 4-7, y
-q = tanβ(x-p)・・・・・・・・・(
4) (3L (from 41 x”=p ± (W/ 2) cos β/
5in(α-β)y=q±(W/2)sin
β/5in (α−β) (same order of signs) [Effects of the invention] As explained above, the present invention is applicable to a general pattern consisting of a straight line, a circle, or an arc, where these lines intersect at an acute angle. When laser marking a pattern, it is possible to avoid irradiating multiple laser beams as much as possible, even at points that intersect or connect at acute angles and the surrounding areas. This has the effect that a more uniform processing state can be obtained.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory views of one embodiment of the present invention, with Figure 1 showing the shape actually processed, and Figures 2 and 3 showing the pattern. . 1...The intersection of the straight line 5-6 and the circular arc 1-4 in Figure 2> and the intersection of the straight line 5-6 and the straight line 4-7 in Figure 3), 2... The perpendicular length from the base line is W/ 2. 3. Conventional connection point. 4. Intersection of arc 1-4 and straight line 4-7.

Claims (1)

[Claims] A laser marking method that marks a two-dimensional pattern by controlling the rotation angle and speed of mirrors attached to two galvanometer-type optical scanners that reflect laser light. When these pattern lines meet at an acute angle or form a connection point in the pattern,
Mark one line that will serve as the baseline, and mark the point where the length of the perpendicular line drawn from a point on the line other than the baseline to this baseline is 1/2 of the line width of the line that is actually marked. A marking processing method using a laser, characterized in that the marking starting point is set as a marking starting point.