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Method and apparatus for diode-laser imaging with compensation for output variations

An image and equipment technology, which can be applied to laser welding equipment, equipment for electrical recording technology using charge patterns, welding equipment, etc., and can solve problems such as enhancement and error.

Inactive Publication Date: 2004-09-08
压缩技术公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this problem is rooted in the mechanics of the imaging system rather than the response of the laser, variations in imaging distance and laser power as a function of duty cycle tend to produce visually the same phenomenon (in the form of varying spot size), so the mutually reinforcing errors

Method used

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  • Method and apparatus for diode-laser imaging with compensation for output variations
  • Method and apparatus for diode-laser imaging with compensation for output variations
  • Method and apparatus for diode-laser imaging with compensation for output variations

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Embodiment Construction

[0026] Referring first to Figure 1, there is schematically illustrated the basic components of an exemplary environment in which the present invention may be applied. Recording medium 50, such as a printing plate blank or other graphic arts structure, is attached to a support during the imaging process. In the depicted embodiment, the support is a cylinder 52 around which recording medium 50 is wound. If desired, the cylinder 52 can be incorporated directly into a conventional lithographic design as a thin-walled cylinder for printing. Cylinder 52 is supported in a frame and driven in rotation by a standard electric motor or other conventional means. The angular position of cylinder 52 is monitored by a shaft encoder associated with register 55 . The optical components of the present invention described below may be mounted on a writing head for movement on a lead screw and guide rod assembly that traverses the recording medium 50 as it rotates. The axial movement of the wr...

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Abstract

The invention relates to a method and apparatus for diode-laser imaging with compensation for output variations. The apparatus includes a source of radiation having an input power level, and an output level that varies with the duty cycle. The apparatus also includes means for focusing the radiation onto a recording surface, and a power supply for driving the radiation source. In the case of a diode laser, the power supply delivers a variable current, the magnitude of which determines the power output of the laser. The radiation source is operated to produce, on the recording surface, an imagewise pattern of spots, and an adjustment facility alters the output of the power supply to compensate for output-level variations resulting from duty cycle.

Description

technical field [0001] The present invention relates to digital printing apparatus and methods, and more particularly, to a system for causing an image-imaging typesetting printing unit to be printing or to stop printing by using digitally controlled laser output. Background technique [0002] In offset lithography, a printable image appears on a printing element as a pattern of ink-accepting (oleophilic) and ink-repelling (oleophobic) surface areas. Once the ink has been applied to these areas, it is effectively transferred to the recording medium in a nearly true image pattern. Dry printing systems utilize printing units whose ink-repelling parts are sufficiently repellent to ink to allow its immediate application. The ink uniformly applied to the printing unit is transferred to the recording medium in an image-like pattern. Typically, the printing unit first contacts a compliant intermediate surface called a blanket cylinder, which in turn applies the image to paper or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41C1/05B41C1/10H04N1/40H04N1/401
CPCH04N1/40037B41C1/1033H04N1/4015
Inventor W·米勒J·F·克兰J·G·索萨G·E·卡巴纳
Owner 压缩技术公司