发明名称 |
Scanning optical system |
摘要 |
A scanning optical system for use in a light scanner including a light deflector for deflecting a light beam to scan a surface is disposed between the light deflector and the scanned surface. The scanning optical system focuses the defelcted light beam onto the scanned surface and keeps the scanned surface and a light beam deflecting point in substantially conjugate relationship in an auxiliary scanning direction for thereby correcting facet errors of the light deflector. The scanning optical system has a saddle-shaped convex toroidal surface having a radius of curvature in a cross section along the auxiliary scanning direction, the radius of curvature being progressively greater in a direction away from the optical axis of the scanning optical system. The scanning optical system satisfies the following condition: d/fM>0.6 where fM is the focal length of the scanning optical system in a main scanning plane and d is the distance on the optical axis between the saddle-shaped toroidal surface and the scanned surface.
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申请公布号 |
US4955682(A) |
申请公布日期 |
1990.09.11 |
申请号 |
US19890386256 |
申请日期 |
1989.07.28 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
YAMAGUCHI, KATSUMI;SAKUMA, NOBUO |
分类号 |
G02B26/10;G02B3/02;G02B13/00;G02B26/12;G02B27/00 |
主分类号 |
G02B26/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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