发明名称 |
Scanning optical apparatus |
摘要 |
A scanning optical apparatus includes a light source device, a first optical element for converting a beam emitted from the light source device to a converging light beam, a deflecting element for deflecting the beam emitted from the light source device, a second optical element for focusing the beam emerging from the first optical element in a linear shape longitudinal in a main scanning direction on a deflective face of the deflecting element, and a third optical element for focusing the beam deflected by the deflecting element in a spot shape on a scanned surface. The third optical element has a spherical lens and a toric lens in order from the side of the deflecting element, surfaces of the spherical lens comprise a meniscus shape of positive refracting power with a concave surface faced toward the deflecting element, and the toric lens has two lens surfaces formed in aspherical shapes in a main scanning section and comprising a meniscus shape of positive refracting power with a convex surface faced toward the deflecting element in the vicinity of a center of scan. <IMAGE> |
申请公布号 |
EP0851261(A3) |
申请公布日期 |
1998.09.23 |
申请号 |
EP19970122397 |
申请日期 |
1997.12.18 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
FUJIBAYASHI, KAZUO;HOSHI, KOJI;KATO, MANABU;ISHIBE, YOSHIHIRO |
分类号 |
G02B26/10;G02B13/00;G02B13/18;G02B26/12 |
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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