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Tandem laser scanning unit

A technology of laser scanning and scanning unit, which is applied in the field of tandem LSU, can solve problems such as inability to form colors and images, monochromatic images do not correspond to each other, and reduce image quality

Inactive Publication Date: 2007-03-21
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Scanline distortion degrades image quality because the spacing between scanlines cannot be kept consistent
Specifically, in a color image forming apparatus that forms a color image by superimposing different monochromatic colors, the monochromatic images on the transfer belt do not correspond to each other, so desired colors and images cannot be formed

Method used

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Embodiment Construction

[0018] The present invention will now be described more fully with reference to FIGS. 1-6, which illustrate exemplary embodiments of the invention. 1 and 2 illustrate a tandem laser scanning unit (LSU) according to an exemplary embodiment of the present invention. FIG. 1 shows a main scan section of a tandem laser scanning unit (LSU) according to an exemplary embodiment of the present invention, and FIG. 2 shows a sub-scan section of an LSU according to an exemplary embodiment of the present invention. The main scanning direction (y direction) means the direction in which the light beam is scanned onto the photosensitive drum through the deflector. The main scanning direction corresponds to the scanning line direction of the photosensitive drum. The sub-scanning direction (x direction) corresponds to the rotation direction of the photosensitive drum.

[0019] Referring to FIG. 1, the tandem LSU includes first to fourth light sources 1Y, 1M, 1C, and 1K, corresponding to respe...

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PUM

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Abstract

A tandem laser scanning unit (LSU) is provided. The tandem LSU includes a light source, a beam deflector, and an optical scanning lens. The beam deflector rotates on a light-emitting path of the light source to simultaneously deflect different light beams obliquely incident at a predetermined angle to each other within a sub-scanning plane substantially parallel to the rotational axis of the beam deflector. The optical scanning lens allows the light beams deflected by the beam deflector to be condensed on corresponding photosensitive drums. The optical scanning lens includes at least one sub-scanning cross-section having an aspherical surface to reduce the curvature of a scanning line. Using the tandem LSU, the distortion and curvature of the scanning line are corrected while providing an oblique incidence optical system having advantages in terms of manufacturing costs and driving efficiency.

Description

technical field [0001] The present invention relates to a tandem laser scanning unit (LSU). More particularly, the present invention relates to a tandem LSU capable of forming a color image by simultaneously scanning light beams emitted from a plurality of light sources to different photosensitive drums. Background technique [0002] The laser scanning unit (LSU) used in laser printers, digital copiers, barcode readers, and facsimile machines utilizes the main scanning operation performed by the beam deflector and the sub-scanning operation performed by rotating the photosensitive drum to form latent images on the exposed surface. picture. Specifically, in order to realize a color image, the tandem imaging device includes a plurality of exposure bodies corresponding to corresponding color components. An example of a tandem imaging device is a color laser printer. A tandem image forming apparatus using tandem LSUs forms monochromatic lights corresponding to respective colo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/10G03G15/04
CPCG02B26/125B41J2/473G02B26/123G02B26/124G03G15/04
Inventor 金亨洙金佑圭
Owner HEWLETT PACKARD DEV CO LP
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