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Optical scanner and image forming device

A light scanning device and image technology, applied in the direction of optics, optical components, instruments, etc., can solve problems such as the difference in exit angle and the curvature of scanning line trajectory

Inactive Publication Date: 2009-06-24
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In addition, when the deflecting reflective surface is twisted or curved so that the value of the surface deviation at the incident position of the beam changes with the rotation of the deflecting reflective surface, compared with when the deflecting reflective surface is composed of a pure plane, the output angle will be different. difference, which in turn produces a curvature of the scan line trajectory

Method used

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  • Optical scanner and image forming device
  • Optical scanner and image forming device
  • Optical scanner and image forming device

Examples

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Embodiment Construction

[0116] Hereinafter, the principle and embodiments of the optical scanning device of the present invention will be described in detail based on the drawings.

[0117] figure 1 is a perspective view of the overall structure of the optical scanning device according to the first aspect of the present invention, figure 2 is a perspective view of the main part of the light deflection optical system.

[0118] In the structure, the light deflecting portion is constituted by an optical polyhedron 10 having a plurality (six in the figure) of deflecting reflective surfaces 11 on the sides of the polyhedral column, which rotate about their rotation axes 12 . And, facing the deflection reflective surface 11 participating in the light deflection, two fixed plane mirrors 13, 14 are arranged, said fixed plane mirrors 13, 14 are at a certain angle to each other with a gap 15 between them.

[0119] Furthermore, the light from the light source 21 passes through the lens 22 into a parallel lig...

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Abstract

The invention provides an optical scanning device and an image forming device having the optical scanning device. In the light scanning device, when the outgoing light beam reflected from the deflection reflection surface of the light deflection optical system for the second time is located in the incident plane, the transmission distance from the deflection point for the first time to the deflection point for the second time is set as Ld , and set the surface error angle of the deflecting reflective surface as ε, set the lateral magnification of the scanning optical system in the direction of the incident plane as β, and set the scanning line spacing on the scanned surface as LP, satisfy the following relationship: |β·Ld·tan(2ε) / cos(2ε)|≤0.25·LP(30).

Description

[0001] This application is a divisional application of the patent application with application number 03804198.7. The filing date of the original application is May 7, 2003, and the title of the invention is "Optical Scanning Device and Cover Glass Cleaning Mechanism for Optical Scanning Device". technical field [0002] The present invention relates to an optical scanning device used for image writing and exposure in an image forming apparatus such as a laser printer, and more particularly to an optical scanning device that sequentially injects a light beam twice on a deflection reflection surface such as a rotating polygon mirror. [0003] The present invention also relates to a cover glass cleaning mechanism of an optical scanning device having a structure capable of reliably removing dust and the like adhering to the surface of the cover glass. Background technique [0004] Conventionally, Japanese Patent Application Laid-Open No. Sho 51-6563 proposes an optical scanning ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B26/12G02B27/00
Inventor 宗和健井上望三井洋一
Owner SEIKO EPSON CORP
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