发明名称 |
Diffractive optical element and image reader using the same |
摘要 |
A laminate-type diffractive optical element which is easily producible and which allows high optical performance to be easily achieved, and an optical system using the same, are disclosed. In the diffractive optical element formed by laminating a plurality of diffraction gratings, when the distance between the uppermost portion of one diffraction grating and the lowermost portion of the other diffraction grating in two diffraction gratings adjacent to each other along the incident direction of a light is represented by D (mum), these two diffraction gratings are arranged to satisfy the following relation: 10 mum<D<40 mum.
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申请公布号 |
US2002039233(A1) |
申请公布日期 |
2002.04.04 |
申请号 |
US20010961422 |
申请日期 |
2001.09.25 |
申请人 |
SUGIYAMA TAKAYUKI;SATO HIROSHI;FUKASAWA MOTOMU;SHIMOMURA HIDEKAZU |
发明人 |
SUGIYAMA TAKAYUKI;SATO HIROSHI;FUKASAWA MOTOMU;SHIMOMURA HIDEKAZU |
分类号 |
G02B5/18;G02B13/18;(IPC1-7):G02B5/18;G02B27/44 |
主分类号 |
G02B5/18 |
代理机构 |
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