Title:
SCANNING IMAGE FORMATION OPTICAL SYSTEM AND OPTICAL SCANNER
Document Type and Number:
Japanese Patent JP3441624
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively reduce the pitch unevenness of a scanning line by taking the ununiformity of refractive index distribution at the scanning image formation optical system of an optical scanner into consideration.
SOLUTION: This optical system is the scanning image formation optical system of the optical scanner performing optical scanning by forming an image of linear image long in a direction corresponding to main scanning from a luminous flux from the side of a light source 10 and deflecting it by a polygon mirror 18 having a deflecting reflection surface in the vicinity of the image formation position of the linear image and condensing a deflected luminous flux as a light spot on a surface to be scanned 22 by the scanning image formation optical system. In this case, the optical system is constituted of a lens 20 which possesses refractive index distribution in the direction corresponding to subscanning and whose refractive index is ununiform, and the power changing quantity of the optical system in the direction corresponding to subscanning originating from the refractive index distribution in set as ΔPc on an optical axis and as ΔPE on the most peripheral optical path of an effective scanning area, and the image formation position of the deflected luminous flux when the lens 20 has a uniform refractive index N0 in the direction corresponding to subscanning by the scanning image formation optical system is set negative on the side of the polygon mirror 18 by measuring from the position of the surface to be scanned, and is set as Qc on the optical axis and as QE on the most peripheral optical path of the effective scanning area, and conditions such as (1) &verbar ΔPc&verbar >&verbar ΔPE&verbar and (2) QE>0>Qc are satisfied.
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Inventors:
Koji Masuda
Seizo Suzuki
Yoshinori Hayashi
Hiroyuki Suhara
Seizo Suzuki
Yoshinori Hayashi
Hiroyuki Suhara
Application Number:
JP18861797A
Publication Date:
September 02, 2003
Filing Date:
July 14, 1997
Export Citation:
Assignee:
株式会社リコー
International Classes:
G02B26/10; G02B13/00; G02B13/18; G02B26/12; (IPC1-7): G02B13/00; G02B13/18; G02B26/10
Attorney, Agent or Firm:
Toru Kabayama (1 person outside)
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