Subtractive filter for the printing of color photographic film

Details Subtractive filter for the printing of color photographic film Subtractive filter for the printing of color photographic film

1982-03-26

1984-07-10

Walsh, Donald P.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 71, 350313, 350315, 362281, 362293, G03B 2773, G02B 522

Patent

active

044590148

ABSTRACT:
A subtractive filter having three elementary filters, each comprising a fixed cylindrical central portion having at its center a channel for the passage of the light and on its surface a radial milled slot; a rotary ring concentric to the said fixed cylindrical central portion having a graduation on its central periphery, the inside of said rotary ring having the shape of a logarithmically progressive ramp; and a filter holder comprising a frame adapted to slide in the said radial milled slot in the fixed cylindrical central portion, the bottom of said frame having the shape of a rounded point which rests against said ramp and the top of said frame having a spring resting against a part fastened to the periphery of the fixed central portion, said frame of said filter holder comprising at its top a window opening and at its bottom the filter. Regulation of light passing through each of the three filters is accomplished by rotating the rotary rings.

REFERENCES:
patent: 2682801 (1954-07-01), Davidson
patent: 3027801 (1962-03-01), Simmon
patent: 3049051 (1962-08-01), Debrie
patent: 3100419 (1963-09-01), Clapp
patent: 3684371 (1972-08-01), Weisglass et al.
patent: 3756712 (1973-09-01), Weisglass et al.
patent: 3825337 (1974-07-01), Lucas
patent: 3880519 (1975-04-01), Barbieri
patent: 4018527 (1977-04-01), Bartel et al.
patent: 4168904 (1979-09-01), Furukawa
patent: 4191466 (1980-03-01), Gandini
patent: 4257086 (1981-03-01), Gulliksen
patent: 4319834 (1982-03-01), Terrill
patent: 4362383 (1982-12-01), Yonehara et al.
patent: 4408873 (1983-10-01), Labrum

Affiliated with

Also associated with

Rating

Subtractive filter for the printing of color photographic film does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Subtractive filter for the printing of color photographic film, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subtractive filter for the printing of color photographic film will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1574405