Title:
光走査装置及び画像形成装置
Document Type and Number:
Japanese Patent JP5309627
Kind Code:
B2
Abstract:
An aperture has an aperture opening that transmits a predetermined portion of a light beam. A phase optical element changes a phase of a portion of a light beam. A scanning lens focuses the light beam into a beam spot on a scanning surface. The phase optical element has a function of increasing light intensity of a side-lobe of the scanning beam near the scanning surface. The aperture opening is set to satisfy 0.03<=(SR-SA)/SR<=0.20, where SR and SA are areas of a rectangle circumscribing the aperture opening and the aperture opening, respectively. The function of the phase optical element and the aperture expand a depth allowance of the beam spot.
Inventors:
Shigeaki Imai
Application Number:
JP2008061860A
Publication Date:
October 09, 2013
Filing Date:
March 11, 2008
Export Citation:
Assignee:
株式会社リコー
International Classes:
G02B26/10; B41J2/44; G02B26/12; H04N1/113
Domestic Patent References:
| JP2008026586A | ||||
| JP2001356290A | ||||
| JP2004101912A | ||||
| JP2005266258A |
Attorney, Agent or Firm:
Shogo Honda
Toru Kabayama
Toru Kabayama
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