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Laser printer having variable beam spacing

A technology of laser printers and printers, which is applied in printing, optics, optical components, etc., and can solve problems such as printing speed reduction

Inactive Publication Date: 2004-04-07
LEXMARK INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a dual-beam printer capable of printing at both resolutions is always at a commercial disadvantage because its print speed at 1200dpi is less than that of a single-beam laser printer at 1200dpi, a significant 75% reduction in print speed place

Method used

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  • Laser printer having variable beam spacing
  • Laser printer having variable beam spacing
  • Laser printer having variable beam spacing

Examples

Experimental program
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Effect test

Embodiment Construction

[0039] exist Figures 1A-4E In , the laser beams (such as 10, 11 and 12) are respectively represented by the spot area for each pixel. The shape and size of the beams are schematic and not exact. However, with the same label (such as Figure 1A-1E ) are consistent with each other and represent the relative size of the spot in question. The dashed line originating from the center of the left spot indicates the centerline of the right spot produced by the same laser source, as described below.

[0040] Where the same laser source produces a larger or smaller sized spot usually changes the effective area of ​​the laser beam. This can be done by varying the power of the laser beam and by adjusting other parameters of the printing process available to the designer of the laser printer. In a special case, the laser beam passes through an aperture in the optical system and reaches the surface, where the spot forms an optical power distribution ellipse of spherical curve centered ...

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PUM

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Abstract

A laser printer (13) includes at least three laser beams (10, 11, 12) for simultaneously scanning a rotatable recording medium (22). The laser beams (10, 11, 12) have their centers spaced uniform or non-uniform distances from each other. The centers of the laser beams are spaced predetermined distances from each other so that the print resolution may be 300, 400, 600, or 1,200 dpi depending upon the laser beams (10, 11, 12) selected for use with at least two laser beams always being selected.

Description

technical field [0001] The present invention relates to a laser printer having a multi-beam printhead capable of switching between at least two printing resolutions, and more particularly to a laser printer capable of switching between printing resolutions without significant degradation Print speed, which is exactly what is needed at the moment. Background technique [0002] A single-beam laser printer capable of switching its printing resolution between, for example, 600 dpi (dots per inch) to 1200 dpi has previously been proposed. Increasing the resolution of a single-beam laser printer from 600dpi to 1200dpi will inevitably reduce the printing speed of 1200dpi to half of 600dpi. This printing relationship is based on the maximum mirror motor speed. [0003] It has also previously been proposed to increase the throughput of laser printers by using two beams of light to print two adjacent lines on a recording medium. This enables increased print throughput without the n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B41J2/44G02B26/10G02B26/12H04N1/036H04N1/113H04N1/23
CPCH04N1/113G02B26/123B41J2/455G02B26/10H04N1/036H04N1/23
Inventor 加利·艾伦·邓顿戴维·库尔特·克拉冯巴赫
Owner LEXMARK INT INC