发明名称 |
Method of manufacturing ND filter, and aperture device and camera having ND filter |
摘要 |
The present invention provides a method of manufacturing an ND filter having a gradation density distribution, the ND filter, and an aperture device and a camera having the ND filter. A structure thereof is as follows. The method of manufacturing an ND filter having at least two kinds of films on a substrate includes the steps of: forming a film of at least one layer other than an outermost layer having a gradation density distribution while rotating a slit mask integrally with the substrate; and forming a film of the outermost layer without using the slit mask.
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申请公布号 |
US2004021967(A1) |
申请公布日期 |
2004.02.05 |
申请号 |
US20030630888 |
申请日期 |
2003.07.30 |
申请人 |
YANAGI MICHIO;ISHII FUMIE;UCHIYAMA MASAYUKI;WAKABAYASHI TAKAYUKI |
发明人 |
YANAGI MICHIO;ISHII FUMIE;UCHIYAMA MASAYUKI;WAKABAYASHI TAKAYUKI |
分类号 |
G02B5/20;(IPC1-7):G02B5/22 |
主分类号 |
G02B5/20 |
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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