Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1992-05-13
1993-07-20
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 38, G03B 2774, G03B 2780
Patent
active
052298221
ABSTRACT:
The present invention provides a photometric unit designed for a photographic projector-printer assembly, which does not require a movable portion and is thus simple in its structure and eliminates any time lag in focal length change. The photometric unit 20 is diagonally offset with respect to the projection-side optical axis and has two area sensors 9 and 10 mounted in parallel with each other on a common substrate plate 8 and two image-formation lenses 11 and 12 having different focal lengths, which are located in operative association with the two area sensors. The optical axis a of one image-formation lens 11 having a longer focal length is positioned such that it intersects the optical axis of the projection optical path at a point O on the negative film, whereby a negative film image formed on either one of said area sensors depending upon the size of the image on said negative film is photoelectrically converted for photometry measurement.
REFERENCES:
patent: 3398635 (1968-08-01), De Boer
patent: 4690548 (1987-09-01), Holm
patent: 4707120 (1987-11-01), Yamamoto
patent: 4728996 (1988-03-01), Matsumoto
patent: 4866475 (1989-09-01), Suzuki
Katakura Kazuhiko
Yamamoto Takashi
Fuji Photo Film Co. , Ltd.
Hayes Monroe H.
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