Automatic focusing device for an enlarger

Details Automatic focusing device for an enlarger Automatic focusing device for an enlarger

1983-09-14

1985-07-30

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2734, G03B 2740

Patent

active

045318301

ABSTRACT:
An improved enlarger for producing prints from an image bearing negative includes a film carrier, an enlarging lens, a light source, and a supporting pole for moving the elements to different operative positions. The apparatus is provided for inputting a signal representative of the focal length, and detectors are provided for determining a first and second datum position with the enlarging lens focused at each position. The information representative of these positions can then be used to automatically provide an in-focus position for the enlarging lens at a desired magnification level when the film carrier is subsequently moved.

REFERENCES:
patent: 3735686 (1973-05-01), Brewer et al.
patent: 3832058 (1974-08-01), Gusovius
patent: 4021115 (1977-05-01), Jeppesen
patent: 4313676 (1982-02-01), Nygaard
patent: 4488804 (1984-12-01), Takagi

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