Photographic printer and film scanner having an LED light source

Details Photographic printer and film scanner having an LED light source Photographic printer and film scanner having an LED light source

1995-04-26

1997-09-02

Pendegrass, Joan H.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 69, 355 70, G03B 2700, G03B 2772

Patent

active

056637829

ABSTRACT:
A photographic printer has an exposure station, in which a frame of a photographic film and color photographic paper are set. A light source is disposed in opposition to the color paper with reference to the photographic film set in the exposure station, and constituted by LED elements. The LED elements are disposed in a matrix for emitting light of red, green and blue colors. The light source illuminates the frame from behind. The color paper is exposed by the light transmitted through the frame, to print the frame recorded on the photographic film to the color paper. In a preferred embodiment, a drive signal is determined individually for driving respective the LED elements. The drive signal is applied to the respective LED elements.

REFERENCES:
patent: 4806965 (1989-02-01), Yamanouchi et al.
patent: 4875071 (1989-10-01), Shiota
patent: 5036402 (1991-07-01), Shiota
patent: 5122831 (1992-06-01), Suzuki
patent: 5214468 (1993-05-01), Seto
patent: 5255171 (1993-10-01), Clark
patent: 5515136 (1996-05-01), Nishio et al.

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