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Optical scanning unit and image forming apparatus

By adjusting the ratio of the beam scanning speed to the linear speed of the latent image carrier and adjusting the posture of the optical element, the image tilt problem of the rotating deflector at low rotational speeds is solved, and efficient image formation and output are achieved.

Inactive Publication Date: 2008-09-17
RICOH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the ratio K (k=V / Vimg) of the processing linear velocity V to the scanning line velocity Vimg also changes, and as a result, there is a problem that the scanning line is inclined and the output image is inclined.

Method used

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Examples

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Embodiment Construction

[0085] Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In the following embodiments, although various limitations are made on constituent elements, types, combinations, shapes, relative arrangements, etc., these are merely examples, and the present invention is not limited thereto.

[0086] figure 1 It is a perspective view showing an example of an optical scanning device to which the present invention is applicable. The optical scanning device 50 shown in the figure is a multi-beam system, and has first and second semiconductor lasers 51 and 52 as light sources, and the first and second semiconductor lasers 51 and 52 constitute a multi-beam light source unit of a beam emitting unit. The multi-beams emitted from the semiconductor lasers 51 and 52 are respectively converted into parallel beams by the collimator lenses 53 and 54 , synthesized by the combining prism 55 , and collected by the cylindrical lens...

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Abstract

The invention relates to an optical scanning unit and image forming apparatus using same. According with the optical scanning unit and image forming apparatus, even speed rate K of a latent image and a scan line changes, the scan line inclination can be restrained. The device adjusts an inclination of the scan line on photoreceptor drum corresponding to speed rate K of the light beam Vimg scanned on photoreceptor drum as the latent image carrier relative to a reference scan line V on the photoreceptor drum. Consequently, speed rate K of the line speed V and scan speed Vimg can be restrained for inclination adjustment unit from inclining relative to the reference scan line.

Description

technical field [0001] The present invention relates to an optical scanning device used in writing systems of digital copiers, laser printers, etc., and an image forming apparatus equipped with the same. Background technique [0002] Such an image forming apparatus has an optical scanning device for writing a latent image on an image carrier such as a photoreceptor. Examples of such an optical scanning device include a configuration in which a light beam from a light source is deflected by a rotary deflector to expose and scan a photoreceptor serving as a latent image carrier (for example, Patent Documents 1 to 3). [0003] The printing process in the image forming device is to use an optical scanning device to form a latent image on an image carrier, use a developing means to visualize the latent image as a toner image, and transfer and fix the toner image to transfer paper, etc. on the recording material, and then discharged out of the unit. [0004] In recent years, use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/47G03G15/00
CPCB41J2/473G02B26/125G02B26/127H04N1/047H04N1/1135H04N1/12H04N2201/0082H04N2201/04755H04N2201/03108H04N2201/04756
Owner RICOH CO LTD