Method of manufacturing ND filter, and aperture device and...

Details Method of manufacturing ND filter, and aperture device and... Method of manufacturing ND filter, and aperture device and...

2005-10-04

2005-10-04

Boutsikaris, Leo (Department: 2872)

Optical: systems and elements

Absorption filter

Neutral or graded density

C359S885000, C359S889000, C396S108000

Reexamination Certificate

active

06952314

ABSTRACT:
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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Partial English Translation of Japanese Office Action of JP Application No. 2002-220762.
Partial English Translation of Japanese Office Action of JP Application No. 2002-220770.

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