发明名称 |
Optical scanning device and image forming apparatus |
摘要 |
A first optical system couples a light beam from a light source, including a first lens made of glass with a positive power and a second lens made of plastic with a negative power. A second optical system focuses the light beam from the first optical system onto a scanning surface and moves a light spot on the scanning surface in a main-scanning direction. One of an incidence plane and an output plane of the first lens is spherical while the other is spherical or flat. A cross-sectional plane of the second lens along one of the main-scanning direction and a sub-scanning direction has a non-arc shape on at least one of the incidence plane and the output plane. |
申请公布号 |
US8223418(B2) |
申请公布日期 |
2012.07.17 |
申请号 |
US20090365727 |
申请日期 |
2009.02.04 |
申请人 |
ICHII DAISUKE;HIRAKAWA MAKOTO;RICOH COMPANY, LTD. |
发明人 |
ICHII DAISUKE;HIRAKAWA MAKOTO |
分类号 |
G02B26/08;G02B26/10;G02B26/12 |
主分类号 |
G02B26/08 |
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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