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Making image on printing plate using ultrashort laser pulse

A technology of lasers and lasers, which can be used in printing plate preparation, laser welding equipment, devices for controlling laser output parameters, etc., and can solve problems such as high prices

Inactive Publication Date: 2005-02-02
HEIDELBERGER DRUCKMASCHINEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such systems require an expensive pump device for generating laser oscillations, which typically have large installation space dimensions and are expensive

Method used

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  • Making image on printing plate using ultrashort laser pulse
  • Making image on printing plate using ultrashort laser pulse
  • Making image on printing plate using ultrashort laser pulse

Examples

Experimental program
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Embodiment Construction

[0018] Figure 1 shows the making of an image on a printing plate, which is placed on a rotatable cylinder. The light source 10 generates pulsed laser radiation 12 , which is imaged by means of an imaging optics 14 at an image point 16 on a printing plate 18 which is located on a cylinder 110 . The drum 110 is rotatable about its axis of symmetry. This rotation is marked by a double arrow B. The light source 10 is movable along a straight path parallel to the axis of symmetry of the drum 46 , which is indicated by the double arrow A. In FIG. For the continuous production of images, the cylinder 110 is rotated with the printing plate 18 according to a rotational movement B, and the light source 10 is moved according to a translational movement A in the longitudinal direction of the cylinder. This produces an image that travels on a helical path around the axis of symmetry of the drum 110 . The path of image point 16 is given by line 112 . The light source 10 emitting the pul...

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PUM

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Abstract

An improved device for setting an image on printing plates with diode lasers is presented. The laser radiation consists of ultrashort light pulses with a duration of less than 1 ns, which is generated in particular by mode coupling of the laser. For image-setting using a pulsed diode laser, lower average output powers are necessary than in a comparable system used in continuous-wave operation.

Description

technical field [0001] The invention relates to a device for producing an image on a printing plate with at least one laser and an optical system for imaging the laser beam on the printing plate. Background technique [0002] It has been known for a long time that an image can be produced on a printing plate, which can be flat or curved, by irradiating its surface with intense laser radiation. Physical or chemical changes in surface properties occur through light-matter interactions. In the case of changes in the surface properties due to the thermal effect of laser irradiation, a certain threshold energy density is required in order to generate an image point. Furthermore, this threshold fluence depends on the material parameters of the printing plate and the duration of irradiation. If the energy density is less than the threshold energy density, no image point will be generated after a long time of irradiation. Threshold fluence typically decreases with decreasing lase...

Claims

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Application Information

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IPC IPC(8): B41C1/00B41C1/10B41J2/44G03F7/00G03F7/004H01S5/06H04N1/04
CPCB41C1/1008B41J2/442B41C1/1075B41C1/10
Inventor 伯纳德·拜尔
Owner HEIDELBERGER DRUCKMASCHINEN AG