发明名称 |
Optical element, metal die, and cutting tool |
摘要 |
An optical element has diffractive grooves. Each diffractive groove includes a first surface approximated by a predetermined optical function; a second surface extending in a direction to cross the first surface and being parallel to the optical axis; and a third surface to connect the first surface and the second surface. A width of the third surface in the direction perpendicular to the optical axis is 0.5% to 15% of the sum of a width of the first surface in the direction perpendicular to the optical axis and the width of the third surface in the direction perpendicular to the optical axis.
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申请公布号 |
US6791764(B2) |
申请公布日期 |
2004.09.14 |
申请号 |
US20030386439 |
申请日期 |
2003.03.13 |
申请人 |
KONICA CORPORATION |
发明人 |
HOSOE SHIGERU |
分类号 |
G02B5/18;(IPC1-7):G02B13/18;G02B3/02 |
主分类号 |
G02B5/18 |
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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