| 发明名称 |
Diffraction grating having a plurality of different grating constants |
| 摘要 |
In a diffraction grating grooves having at least two kinds of grating constants are alternately arranged so as to repetitive at a constant period.
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| 申请公布号 |
US4886341(A) |
申请公布日期 |
1989.12.12 |
| 申请号 |
US19870068412 |
申请日期 |
1987.07.01 |
| 申请人 |
HITACHI, LTD. |
发明人 |
OISHI, KONOSUKI;SUGAHARA, KENSHI |
| 分类号 |
G01J3/18;G02B5/18 |
主分类号 |
G01J3/18 |
| 代理机构 |
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代理人 |
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| 主权项 |
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