ND filter and aperture device using the same

Details ND filter and aperture device using the same ND filter and aperture device using the same

1994-09-08

1995-12-26

Dzierzynski, Paul M.

Optical: systems and elements

Absorption filter

Neutral or graded density

359889, 359893, 359233, G02B 522, G02B 520, G02B 110

Patent

active

054792983

ABSTRACT:
A plurality of darkness distributions having a predetermined relationship with a darkness distribution for ND-filtering transmission light at the position of an aperture blade in an aperture device are formed on an original. The original is photographed on a film by a camera, and after the film is developed, the film is molded to obtain a plurality of ND filters.

REFERENCES:
patent: 2244507 (1941-06-01), Thomas
patent: 2356694 (1944-08-01), Potter et al.
patent: 3149968 (1964-09-01), Stephens
patent: 3488118 (1970-01-01), Parrent et al.
patent: 3552288 (1971-01-01), Corley
patent: 3669540 (1972-06-01), Rattman et al.
patent: 4113359 (1978-09-01), Koike et al.
patent: 4952485 (1990-08-01), Shibahara et al.
patent: 5157528 (1992-10-01), Clark et al.

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