公开(公告)号：US06952314B2

公开(公告)日：2005-10-04

申请号：US10630888

申请日：2003-07-30

申请人： Michio Yanagi ,  Fumie Ishii ,  Masayuki Uchiyama ,  Takayuki Wakabayashi

发明人： Michio Yanagi ,  Fumie Ishii ,  Masayuki Uchiyama ,  Takayuki Wakabayashi

IPC分类号： G02B5/20 ,  G02B5/22

CPC分类号： G02B5/205

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.

摘要翻译： 本发明提供一种制造具有灰度密度分布的ND滤光器，ND滤光器以及具有ND滤光片的光圈装置和照相机的方法。 其结构如下。 制造在基板上具有至少两种膜的ND滤光器的方法包括以下步骤：在与基板一体地旋转狭缝掩模的同时，形成除具有层间密度分布的最外层以外的至少一层的膜; 并且不使用狭缝掩模来形成最外层的膜。