KR20030052335A - Roll etching method using laser - Google Patents

Abstract

PURPOSE: A roll etching method using a laser is provided to efficiently transmit information and to improve a working efficiency by using continuous on/off signals when forming a pattern. CONSTITUTION: A number of pixels having continuous same patterns are checked from etching patterns (S401). Then, laser on/off with respect to the patterns is determined and a laser control signal is outputted (S403). After that, a roll is etched by radiating laser beam onto the roll corresponding to the number of pixels having the continuous same patterns. When radiating laser beam, next etching pattern data are read in advance. The roll is again etched by radiating laser beam onto the roll corresponding to the number of pixels having the continuous same patterns through reversing a phase of laser beam.

Description

Roll etching method using laser {ROLL ETCHING METHOD USING LASER}

The present invention relates to an apparatus for forming a three-dimensional uneven pattern using a laser on the surface of the roll, and more particularly, to display the on / off signal of the laser by the repeated number of continuous on / off signal to improve the etching speed The present invention relates to a roll etching method using a laser.

In general, as a method of forming a three-dimensional uneven pattern on the surface of the rolling roll, an electrical method or an etching method using a design film is mainly used.

At this time, in the etching method using a design film, after coating and drying a photocurable photosensitive resin on the surface of the roll which will form a pattern, it winds and exposes the design film (black and white) in which the etching pattern is drawn. At this time, only the portion exposed to the pattern of the pattern film is cured. After washing with the developer after exposure, only the hardened portion of the resin remains on the surface of the roll. Then, if it is corroded again with the etching solution, only the part without the resin is corroded, and the pattern is engraved on the roll surface. Therefore, the roll surface etching treatment is completed by washing the resin layer remaining after the etching. However, this method is easy to produce defects in the continuity of the pattern deviating from the seam portion of the doam films when the doam film is wound on the roll surface by manufacturing the design film, and also requires a skilled technician to work.

In addition, a visual method using electric discharge machining is to form an uneven pattern on the roll surface using electric discharge. In general, there is a problem that wear occurs on the discharge electrode as the processing time elapses, and thus the processing capacity varies with time.

Therefore, in recent years, a visual method using a laser has been used. Since this method uses a laser light, the tool does not wear out, and since the laser beam is continuously irradiated to form an uneven pattern on the surface of the roll, Compared to the method used, the process is simpler and the reproducibility is excellent.

1 is a block diagram showing a configuration of an etching apparatus using a general laser. An encoder 2 for detecting a rotational speed of a roll 1 and a moving device 3 arranged in parallel in the longitudinal direction of the roll 1 are shown in FIG. And a rotation speed of the roll 4 detected from the encoder 2 and the laser 4 for irradiating light to the surface of the roll 1 rotating at a constant speed by moving left and right on the moving device 3. Data of the roll etch control device 6 and the roll etch control device 6 and the host pc 8 that control the laser on / off control signal and the moving speed of the moving device 3 according to the pattern stored as a reference. A bus 7 enabling communication and a host pc 8 providing roll etch pattern data to the roll etch control device 6 via the bus 7.

That is, when the completed pattern is transmitted from the host PC 8 to the roll etching control device 6, the pattern is stored in the memory 6a.

Then, the roll etching control device 6 reads the stored pattern data to control the laser irradiation. In this case, as shown in FIG. 3, first, the pattern data stored in the memory 6a is read. (S301). Then, it is determined whether the read pattern pixel is "1" or "0", and an on or off signal is output to the laser 4 (S302). By this control, the laser 3 outputs the laser according to the control signal, and the roll 1 rotates by one count. That is, the laser is operated after the data of the memory is read and judged on or off every laser irradiation. At this time, the place irradiated with the laser is etched to form a convex pattern.

The precision of the etched pattern is related to the size of the laser beam and the precision of the original pattern, both of which are usually limited by the speed of the processor.

Figure 2 shows an example of a pattern that is formed continuously on the roll surface, for example, when using a laser beam size of 30㎛ to draw a pattern of the same size (dimple of 300㎛ diameter), approximately 100 Continuous on / off information of (10 x 10) is required. However, when etching this pattern with a laser beam of 60 mu m, only 25 pieces (5 x 5) of information need to be read. Instead, if the laser beam of 60 μm is used, the etched pattern is much different from the circular shape as shown in FIG. 2A, and when the 30 μm laser beam is used, it is more circular in shape as shown in FIG. 2B. A near pattern may appear.

Therefore, in order to keep the edges of the pattern smooth and maintain the size precisely, it is desirable to reduce the size of the laser beam, which means that the amount of data increases. Therefore, when roll etching is performed by performing on / off discrimination, laser irradiation, roll rotation, etc. on a pixel unit as in the related art, there is a disadvantage in that the speed is significantly lowered and productivity is lowered.

Therefore, the present invention has been proposed to solve the above-mentioned conventional problems, and its object is to efficiently convey information and improve work speed even if the amount of data increases by using the continuity of on or off signals during pattern formation. It is to provide a roll etching method using a laser.

1 is a block diagram showing a roll etching apparatus using a general laser.

2 shows an example of a pattern etched on the roll surface, (A) is a pattern having a resolution of 10 × 10, (B) is a form of a pattern having a resolution of 30 × 30.

3 is a flowchart illustrating a method of operating a conventional laser etching apparatus.

4 is a flowchart illustrating a laser roll etching method according to the present invention.

As a technical means for achieving the above object of the present invention, the present invention is a roll etching method using a laser to turn on / off the laser in accordance with the etching pattern pattern to etch the roll surface,

A) checking the number of repetitions of the same continuous pattern in the etching pattern pattern;

B) determining whether or not the read pattern data is laser on / off;

D) etching the roll by continuously irradiating the laser with the same number of repetitions of the same pattern;

E) reading in advance the next etching pattern data during the laser operation by step d); And

F) carrying out the step d) with the laser in reverse phase.

Hereinafter, a laser roll etching method according to the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 5, a pattern of a size of 10 × 10 is regarded as being etched, and a roll etching method according to the present invention will be described below.

In FIG. 1, the etching process of the roll 1 is etched in the longitudinal direction according to the rotation of the roll 1, and the moving device 3 moves the laser 4 to the right at each rotation of the roll 1. To be etched to the right end of the roll (1).

At this time, when etching the pattern as shown in Figure 5, the processing is performed as follows.

The data of the memory 6a in which the etching pattern as shown in FIG. 5 is stored is read (S401). At this time, the data is not read one pixel at a time, and the repeated number of repetitions of the same identical pattern is counted at once (S402). Therefore, when the etching direction is executed in the direction of the arrow, the first read data becomes the repetition number " 4 " for successive '0's. Next, laser on / off is determined for the read data, and a laser control signal is output (S403). In the above example, since the data of the pattern is '0', the laser off signal is output.

Then, the roll etching apparatus 6 does not irradiate the laser until the etching position has passed four times on the basis of the rotation pulse of the roll 1 input from the encoder 2.

In the meantime, the roll etching apparatus 6 also reads the next pattern data from the memory 6a and calculates the number of repetitions of the pattern (S406 and S407).

When the etching position of the next pattern is reached by the rotation of the roll 1, the laser 3 is inverted and turned on, and then the laser irradiation is continuously performed for the next repeated number of times.

This operation is repeated until the etching is completed (S410, S411).

That is, the present invention does not read data at every etching position in pixel units (i.e., in units of laser beam size), but continuously reads the repetition number of the laser beam unit size with respect to the same continuous pattern. By setting the laser on / off only during the operation, the laser etching processing is performed while inverting the laser on / off whenever the pattern is changed.

Therefore, when the pattern is etched as shown in FIG. 5, the pattern data to be read is as shown in FIG. 6. That is, the minimum data value becomes "4" which is the continuous number for "0", and then the on / off signal (ie, the off signal) of the laser for the continuous number "4" is output, and then the continuous Only the repetition counts for the printed patterns are sent in sequence.

As described above, the present invention reads data on an etched pattern as the number of consecutive same patterns, and initially sets the laser on / off, and then rolls the laser by inverting the laser without checking the laser on / off every time the pattern is changed. By doing so, even if the size of the laser beam is reduced in order to improve the accuracy, the information reading time is reduced through the efficient information transmission, and the speed of the etching apparatus can be improved accordingly.

Claims (1)

In the roll etching method using a laser to etch the roll surface by turning the laser on / off according to the etching pattern pattern, A) checking the number of pixels of the same pattern in succession in the etching pattern pattern; B) determining whether or not the read pattern data is laser on / off; D) etching the roll by continuously irradiating a laser by the number of pixels of the same pattern; E) reading in advance the next etching pattern data during the laser operation by step d); And F) Roll etching using a laser, characterized in that the step of performing the step d) with the laser in reverse phase.