发明名称 |
OPTICAL SCANNING DEVICE AND IMAGE FORMING APPARATUS |
摘要 |
An optical scanning device includes a diffractive optical element. The diffractive optical element is a hybrid lens in which a resin layer is joined to a glass-lens base material, and a diffractive surface is provided in the resin layer. The diffractive surface has a multi-step structure including a plurality of zonal surfaces and a plurality of step surfaces.
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申请公布号 |
US2009251753(A1) |
申请公布日期 |
2009.10.08 |
申请号 |
US20090415405 |
申请日期 |
2009.03.31 |
申请人 |
HIRAKAWA MAKOTO;HAYASHI YOSHINORI |
发明人 |
HIRAKAWA MAKOTO;HAYASHI YOSHINORI |
分类号 |
G02B26/10;G02B5/18 |
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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