KR20140143291A - Apparatus and method for forming fine pattern of printing roll - Google Patents

Abstract

The present invention relates to a device and method for forming minute patterns of a printing roll. When minute grooves are formed on the surface of a printing roll through a laser ablation method, the focus of a laser beam is located on the surface of the printing roll using an F-theta lens, and the direction of the laser beam is vertical to the surface of the printing roll.

Description

Technical Field [0001] The present invention relates to a printing roll fine pattern forming apparatus and a printing roll fine pattern forming apparatus,

The present invention relates to a printing roll fine pattern forming apparatus and a fine pattern forming method. More particularly, the present invention relates to a printing pattern fine pattern forming apparatus and a fine pattern forming method for forming fine grooves by a laser ablation method on a surface of a printing roll, To a printing roll fine pattern forming apparatus and a fine pattern forming method which are located on a surface of a roll and in which the direction of the laser beam is perpendicular to the surface of the printing roll.

As electronic devices using microprinting can be manufactured, researches on a method of processing fine grooves on the surface of a printing roll are underway. The printing roll forms fine grooves on the surface thereof to receive the ink therein, and transfers ink contained in the fine grooves to the surface of the substrate by contact with the substrate. In this micro-printing process, the printing performance of the electronic device depends on the width and depth of the fine grooves.

Among various methods of forming fine grooves on the surface of a printing roll, there are a mechanical tool method and a laser ablation method.

The method using a mechanical tool is very effective in forming a regular pattern of fine grooves on the entire surface of a printing roll by cutting off a printing roll surface with a mechanical tool. However, due to the wear of the mechanical tool, the fine grooves at the initial stage of machining are different from the micro grooves at the end of machining, and are not suitable for forming fine grooves of discontinuous patterns for manufacturing electronic devices.

The laser ablation method uses a focused laser instead of a mechanical tool, and irradiates a focused laser to the surface of a rotating printing roll to form fine or continuous grooves in a discontinuous pattern. During the processing, the printing roll continues to rotate, and the focused laser is irradiated in the spiral direction of the printing roll.

Since the laser ablation method is a noncontact type, there is no tool abrasion, and if the laser output is stably controlled, uniform fine grooves can be formed on the entire printing roll. By controlling on / off of the laser while the printing roll is rotated, fine grooves of discontinuous patterns for manufacturing an electronic device can be easily formed.

However, when the laser ablation method is applied, an error occurs in the shape and depth of the pattern due to the vibration of the printing roll and the minute asymmetry of the printing roll when the laser is irradiated while rotating the printing roll.

To solve this problem, Patent Document 1 discloses a method of forming a pattern in a certain area by changing the irradiation position of a laser beam using a scanner while the printing roll is stopped.

Figs. 1 to 3 are for explaining an apparatus and a method for forming a conventional fine pattern described in Patent Document 1. Fig.

1 is a conceptual diagram of an apparatus for forming a conventional fine pattern.

The laser beam emitted from the laser light source 10 is reflected by the first scanner 11 and the second scanner 12 and controls the laser beam by controlling the reflection angles of the first scanner 11 and the second scanner 12. [ can do. The laser beam passes through the telecentric lens 13 and is focused on the machinable area 40 on the surface of the printing roll 20 while maintaining a parallel state.

2 is a cross-sectional view of a telecentric lens and a printing roll of a conventional fine pattern forming apparatus. It is preferable that the laser beam is accurately focused at all points of the printable area 40. [ However, when the printing roll 20 is cylindrical and the distances from the telecentric lens 13 to the points P1, P2, and P3 are different from each other and the focus is in P1, the focus is slightly shifted at P1 and P3 and the width at which the laser beam is irradiated becomes large . Therefore, in P1 and P3, the processing line width of the fine grooves becomes large, and as the energy per unit area decreases, the processing depth becomes shallow.

In the conventional fine pattern forming apparatus, this problem is solved by limiting the processable width B in Fig. That is, when the workable width B is reduced, the difference in the degree of deviation of the focus at the points within the machinable region 40 is reduced.

3 is a cross-sectional view of a printing roll according to a conventional fine pattern forming method.

The fine grooves 30 formed on the surface of the printing roll 20 are preferably oriented parallel to the center of the printing roll 20 but in the conventional fine pattern forming process all within the same processable area 40. The fine grooves 30 are directed toward the central portion of the printing roll 20 while the fine grooves 30 are deviated from the central portion of the printing roll 20 by an angle b. That is, in P2, the laser beam is irradiated in a direction deviating from the central portion direction of the printing roll 20, and the fine grooves 30 are also formed in a direction deviated from the central portion direction of the printing roll 20.

In the conventional fine pattern forming apparatus, such a problem also solves this problem by limiting the processable width B of the printable area 40. That is, by reducing the processable width B, the angle difference between the fine groove 30 and the central portion of the printing roll 20 at the points within the machinable region 40 is reduced.

However, since there is a limitation in limiting the machinable width B of the printable area 40, the difference in focal distance at the surface of the printing roll 20 or the difference in angle between the laser beam and the center part direction of the printing roll 20 Is still largely present. The difference in angles of the fine grooves causes an error in the amount of ink transferred from the fine grooves during printing, directly affecting the print quality, that is, the performance of the printing element.

Patent Document 1: Korean Patent Laid-Open Publication No. 10-2011-48841 (Published on May 05, 2011, entitled: Method for forming fine groove on roll surface using laser)

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide a printing roll fine pattern forming apparatus and a fine pattern forming method in which a difference in focal distance or a laser beam from a surface of a printing roll, And the angle between the direction and the direction is significantly reduced.

According to an aspect of the present invention, there is provided an apparatus for forming a printing roll fine pattern, comprising: a laser light source; A scanner for changing the direction of the laser beam output from the laser light source to a direction perpendicular to the longitudinal direction of the printing roll; An F-theta lens for converting the laser beam so that the focal point of the laser beam is located on the surface of the printing roll and the direction of the laser beam is perpendicular to the surface of the printing roll; Moving means for moving the position of the scanner and the F-theta lens in the longitudinal direction of the printing roll; And a printing roll rotating means.

And a device for branching the laser beam output from the laser light source.

The laser light source may be two or more.

The scanner of the apparatus for fine pattern formation may change the direction of the laser beam using a reflector.

According to another aspect of the present invention, there is provided a method of forming a printing roll fine pattern, comprising: a laser light source; a scanner for changing a direction of the laser beam output from the laser light source; An F-theta lens for converting the laser beam so that the direction of the beam is perpendicular to the printing roll surface, a moving means for moving the position of the scanner and the F-theta lens in the longitudinal direction of the printing roll, A method for forming a printing roll fine pattern using a printing roll fine pattern forming apparatus, comprising: a first step of forming a fine pattern in a predetermined section of a printing roll while the printing roll rotating means is stationary; And a second step of rotating the printing roll at a predetermined angle using the printing roll rotating means, wherein the first step includes a first step of moving the position of the scanner in the longitudinal direction of the printing roll using the moving means ; And a 1-2 step of forming a fine pattern by changing the direction of the laser beam output from the laser light source in a state where the scanner position is fixed to a direction perpendicular to the longitudinal direction of the printing roll.

According to another aspect of the present invention, there is provided a method of forming a printing roll fine pattern, comprising: a laser light source; a scanner for changing a direction of the laser beam output from the laser light source; a focal point of the laser beam positioned on the surface of the printing roll; An F-theta lens for converting the laser beam so as to be in a direction perpendicular to the surface of the printing roll, a moving means for moving the position of the scanner and the F-theta lens in the longitudinal direction of the printing roll, A method of forming a printing roll fine pattern using a pattern forming apparatus, comprising: a first step of forming a fine pattern in a predetermined section of a printing roll while the printing roll rotating means is stationary; And a second step of rotating the printing roll at a predetermined angle using the printing roll rotating means, wherein the moving step moves the position of the scanner in the longitudinal direction of the printing roll, The direction of the laser beam is changed to a direction perpendicular to the longitudinal direction of the printing roll to form a fine pattern.

According to another aspect of the present invention, there is provided a method of forming a printing roll fine pattern, the method comprising: a laser light source; a scanner for changing a direction of the laser beam output from the laser light source; a focal point of the laser beam located on a surface of the printing roll; An F-theta lens for converting the laser beam so that the direction is perpendicular to the surface of the printing roll, a moving means for moving the position of the scanner and the F-theta lens in the longitudinal direction of the printing roll, A method for forming a printing roll fine pattern using a fine pattern forming apparatus, comprising: a first step of forming a fine pattern in a predetermined section of a printing roll while the printing roll rotating means is stationary; And a second step of rotating the printing roll at a predetermined angle using the printing roll rotating means, wherein the moving step moves the position of the scanner in the longitudinal direction of the printing roll, By changing the direction of the laser beam in the longitudinal direction and the oblique direction of the printing roll, the trajectory of the laser beam on the printing roll becomes perpendicular to the longitudinal direction of the printing roll to form a fine pattern.

In the fine pattern formation method, a method in which the scanner changes the direction of the laser beam may be a method of rotating the reflecting mirror that reflects the laser beam.

The printing roll fine pattern forming apparatus and the fine pattern forming method according to the present invention significantly reduce the difference in focal distance on the surface of the printing roll or the angle difference between the laser beam and the central portion of the printing roll, Can be manufactured.

1 is a conceptual diagram of an apparatus for forming a conventional fine pattern;
2 is a cross-sectional view of a telecentric lens and a printing roll of a conventional fine pattern forming apparatus
3 is a cross-sectional view of a printing roll according to a conventional fine pattern forming method
4 is a conceptual diagram of an apparatus for forming a fine pattern according to the present invention
5 is a cross-sectional view of an F-Setter lens and a printing roll according to the present invention
Figs. 6 and 8 are diagrams showing scanning traces of the laser beam in the machinable region

4 is a conceptual diagram of an apparatus for forming a fine pattern according to the present invention.

The apparatus for fine pattern formation according to the present invention includes a laser light source 110, a scanner 120, an f-theta lens 130, a moving unit 140, and a printing roll rotating unit 160 .

The scanner 120 is a device for changing the direction of the laser beam output from the laser light source 100 in a direction perpendicular to the longitudinal direction of the printing roll, and may be constituted by means for rotating the reflecting mirror and the reflecting mirror. The reflector may be a flat surface or may be formed as a curved surface if necessary.

The F-theta lens 130 converts the laser beam so that the focal point of the laser beam is located on the surface of the printing roll 150 and the direction of the laser beam is perpendicular to the surface of the printing roll 150.

The moving means 140 moves the positions of the scanner 120 and the F-theta lens 130 in the longitudinal direction of the printing roll.

The printing roll rotating means 160 can rotate the printing roll 150.

5 is a cross-sectional view of an F-Setter lens and a printing roll according to the present invention.

The F-theta lens 130 of FIG. 5 is designed by Zemax optical design software, in which the focus of the laser beam from the scanner 120 is located on the surface of the printing roll 150 and the direction of the laser beam is parallel to the printing roll 150 ) The laser beam is converted so as to be perpendicular to the surface. The method of using the Zemax optical design software can be easily understood by those skilled in the art, so a detailed description thereof will be omitted.

The following Table 1 shows the angle difference between the laser beam irradiated to the printing roll 150 by the F-theta lens 130 of FIG. 5 and the vertical direction of the surface of the printing roll 150.

Angle of change by scanner (°)  Angular difference (°) 0 0 One 0.01592867 2 0.02741413 3 0.03875093 4 0.04717553 5 0.04782682

According to the above table, it can be seen that the angle difference between the laser beam irradiated on the printing roll 150 and the vertical direction of the surface of the printing roll 150 is 0.05 degree or less, which is close to 0 degree.

The F-theta lens 130 of Fig. 5 converts the direction of the laser beam only in the direction perpendicular to the longitudinal direction of the printing roll, and does not convert it in the longitudinal direction of the printing roll.

Therefore, in order to process the entire machinable area 155 of FIG. 4, it is necessary to move the positions of the scanner 120 and the F-theta lens 130 in the longitudinal direction of the printing roll by the moving unit 140.

At this time, after the scanner 120 converts the direction of the laser beam while processing the one fixed line 157 while the scanner 120 and the F-theta lens 130 are fixed, the moving unit 140 moves the scanner 120 120 and the F-theta lens 130 may be moved. Alternatively, the scanner 120 may process one machining line 157 while changing the direction of the laser beam while moving the positions of the scanner 120 and the F-theta lens 130 by the moving means 140.

6 and 7 are diagrams showing scanning traces of the laser beam in the machinable area. FIG. 6 shows a state in which the scanner 120 changes the direction of the laser beam in a state in which the scanner 120 and the F- FIG. 7 is a view showing a trajectory of a laser beam when the laser beam is processed while moving the scanner 120 and the F-theta lens 130. FIG. Fig.

In FIG. 6, the trajectory of the laser beam is perpendicular to the longitudinal direction of the printing roll 150, but in FIG. 7, the trajectory of the laser beam is oblique to the longitudinal direction of the printing roll 150 .

If the scanner 120 is changed in the direction of the laser beam while the positions of the scanner 120 and the F-theta lens 130 are fixed, there is no influence of vibration or the like generated when the scanner 120 or the like is moved. There is an advantage of being an accurate straight line,

The laser beam can not be scanned while moving the scanner 120 and the F-theta lens 130 after machining of one machinable line 157, so that the machining time becomes long.

 Therefore, it is preferable that the scanner 120 transforms the direction of the laser beam while moving the scanner 120 and the F-theta lens 130 to process one workable line 157.

However, if the fine pattern in the machinable region 155 is formed as a line perpendicular or horizontal to the outer boundary line of the machinable region 155, .

Therefore, if the direction of the scanner 120 is set so that the trajectory of the laser beam in a state where the positions of the scanner 120 and the Frescell lens 130 are fixed is as shown in FIG. 8, the scanner 120 and the Fresceller lens 130 The scanner 120 may have a laser beam locus as shown in FIG. 6 when changing the direction of the laser beam.

When the processing of one processable area 155 is completed in this manner, the printing roll 150 is rotated by a certain angle by the printing roll rotating means 160, and then the printing roll 150 is rotated, The region 155 is processed.

In order to reduce the printing roll processing time, a laser beam output from a laser light source is branched into two or more, or two or more laser light sources are used, and the number of laser beams or the same number of laser light sources, Theta lenses can be used.

The present invention can be applied not only to a printing roll, but also to a roll mold in which a pattern is stamped on a cylinder.

110: laser light source 120: scanner
130: F-theta lens 140: Moving means
150: printing roll 155: processable area
157: processable line 160: printing roll rotating means

Claims (8)

A laser light source;
A scanner for changing the direction of the laser beam output from the laser light source to a direction perpendicular to the longitudinal direction of the printing roll;
An F-theta lens for converting the laser beam so that the focal point of the laser beam is located on the surface of the printing roll and the direction of the laser beam is perpendicular to the surface of the printing roll;
Moving means for moving the position of the scanner and the F-theta lens in the longitudinal direction of the printing roll;
Wherein the printing roll fine pattern forming means includes a printing roll rotating means.
The method according to claim 1,
Further comprising a device for diverging the laser beam output from the laser light source.
The method according to claim 1,
Wherein the number of the laser light sources is two or more.
The method according to claim 1,
Wherein the scanner changes the direction of the laser beam using a reflecting mirror.
A scanner for changing the direction of the laser beam output from the laser light source; a scanner for converting the laser beam so that the focal point of the laser beam is located on the surface of the printing roll and the direction of the laser beam is perpendicular to the surface of the printing roll; A printing roll fine pattern forming method using a printing roll fine pattern forming apparatus including a setter lens, a moving means for moving the position of a scanner and an F-theta lens in the longitudinal direction of the printing roll, and a printing roll rotating means,
A first step of forming a fine pattern in a predetermined section of the printing roll while the printing roll rotating means is stopped;
And a second step of rotating the printing roll at a predetermined angle using the printing roll rotating means,
The first step
A first step of moving the position of the scanner and the F-theta lens in the longitudinal direction of the printing roll using a moving means;
And a 1-2 step of forming a fine pattern by changing the direction of the laser beam output from the laser light source in a direction in which the scanner is perpendicular to the longitudinal direction of the printing roll while the scanner position is fixed, A method for forming a fine pattern.
A scanner for changing the direction of the laser beam output from the laser light source, a scanner for converting the laser beam so that the focal point of the laser beam is located on the surface of the printing roll and the direction of the laser beam is perpendicular to the surface of the printing roll A method of forming a printing roll fine pattern using a printing roll fine pattern forming apparatus comprising a setter lens, a moving means for moving the position of a scanner and an F-theta lens in the longitudinal direction of the printing roll, and a printing roll rotating means,
A first step of forming a fine pattern in a predetermined section of the printing roll while the printing roll rotating means is stopped;
And a second step of rotating the printing roll at a predetermined angle using the printing roll rotating means,
In the first step, the moving unit moves the position of the scanner in the longitudinal direction of the printing roll, and at the same time, changes the direction of the laser beam output from the laser light source so that the scanner is perpendicular to the longitudinal direction of the printing roll to form a fine pattern Wherein the printing roll fine pattern forming method comprises:
A scanner for changing the direction of the laser beam output from the laser light source, a scanner for converting the laser beam so that the focal point of the laser beam is located on the surface of the printing roll and the direction of the laser beam is perpendicular to the surface of the printing roll A method of forming a printing roll fine pattern using a printing roll fine pattern forming apparatus comprising a setter lens, a moving means for moving the position of a scanner and an F-theta lens in the longitudinal direction of the printing roll, and a printing roll rotating means,
A first step of forming a fine pattern in a predetermined section of the printing roll while the printing roll rotating means is stopped;
And a second step of rotating the printing roll at a predetermined angle using the printing roll rotating means,
In the first step, the moving unit moves the position of the scanner and the F-theta lens in the longitudinal direction of the printing roll, and at the same time, the direction of the laser beam output from the laser light source is changed in a direction oblique to the longitudinal direction of the printing roll Wherein the fine pattern is formed while the trajectory of the laser beam on the printing roll is perpendicular to the longitudinal direction of the printing roll.
8. The method according to any one of claims 5 to 7,
Wherein the method of changing the direction of the laser beam is a method of rotating the reflecting mirror that reflects the laser beam.

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