专利名称：Diffraction optical element发明人：Nakai, Takehiko, c/o Canon K.K.申请号：EP00306401.1申请日：20000727公开号：EP1072906A2公开日：20010131
专利附图：
摘要：A diffraction optical element wherein a plurality of diffraction gratings formedof at least two kinds of materials differing in dispersion are laminated, at least two of theplurality of diffraction gratings are formed on a curved surface and adjacent to eachother, and these two adjacent diffraction gratings are equal to each other in the shape of
a curved tip plane in which the tips of respective grating portions are ranged.
申请人：CANON KABUSHIKI KAISHA
地址：30-2, 3-chome, Shimomaruko, Ohta-ku Tokyo JP
国籍：JP
代理机构：Beresford, Keith Denis Lewis
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