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Polygon mirror, laser scanning unit having the same, and image forming apparatus having the same

A laser scanning, polygon mirror technology, applied in the equipment, optical components, optics and other directions of the electric recording process using the charge pattern, can solve the problems of reflectivity deviation limiting the use of polygon mirrors, difficult to achieve mass production of traditional polygon mirrors, toxic and other problems

Inactive Publication Date: 2008-01-23
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a reflectance deviation of about 5% occurs depending on the wavelength of the laser beam
This reflectivity bias limits the use of polygonal mirrors
[0006] In addition, conventional multi-coated polygon mirrors maintain approximately constant reflectance until the wavelength of the laser beam decreases to about 500nm, after which, the reflectance deviation increases in the range of 400nm to 450nm
Therefore, this polygon mirror cannot be effectively used with blue laser diodes
[0007] In addition, the material of the second dielectric layer ZnSe is expensive and toxic
Therefore, it is difficult to process ZnSe, and it is difficult to achieve mass production of conventional polygonal mirrors.

Method used

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  • Polygon mirror, laser scanning unit having the same, and image forming apparatus having the same
  • Polygon mirror, laser scanning unit having the same, and image forming apparatus having the same
  • Polygon mirror, laser scanning unit having the same, and image forming apparatus having the same

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[0030] According to the first embodiment of the present invention, the first dielectric layer 20 and the third dielectric layer 40 comprise the same material. In the first embodiment, the first dielectric layer 20 and the third dielectric layer 40 preferably (but not necessarily) comprise SiO 2 , the second dielectric layer 30 includes TiO 2 . It will be appreciated that the invention is not limited to having dielectric layers and that other types of layers may be used with the invention.

[0031] When it is assumed that the wavelength of the laser diode beam incident on the reflective surface 10 is λ, the following table shows the thicknesses of the first dielectric layer 20, the second dielectric layer 30 and the third dielectric layer 40 as shown in FIG. 3, respectively. .

[0032] Table 1

[0033]

first dielectric layer

Material

SiO 2

thickness

0.19λ

second dielectric layer

Material

TiO 2

thic...

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Abstract

A polygon mirror of a laser scanning unit includes reflective surfaces to reflect laser beams, and first to third dielectric layers laminated on the reflective surfaces. The second dielectric layer comprises TiO2 which can reduce a reflectivity deviation of the wavelengths of the laser beams to below 2%.

Description

technical field [0001] Aspects of the present invention relate to a laser scanning unit deflectively scanning incident light, and more particularly, to an improved polygon mirror of the laser scanning unit and an imaging apparatus having the same. Background technique [0002] In general, printing apparatuses such as laser printers, copiers, and facsimiles using electrophotography use laser scanning units. The laser scanning unit includes: a light source for irradiating the laser beam; a polygon mirror for reflecting and scanning the irradiated beam to a predetermined direction; an Fθ lens for converting the reflected beam into a parallel beam; a mirror for passing through the Fθ The beam of the lens is reflected to the intended target. [0003] The polygon mirror includes a plurality of reflective surfaces capable of reflecting incident light. The polygon mirror rotates at high speed to reflect incident light in a predetermined direction. [0004] According to USP 5,946,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/09G02B26/12G03G15/04
CPCG02B5/09G02B5/0858G02B26/12G02B26/10
Inventor 赵熙诚
Owner SAMSUNG ELECTRONICS CO LTD