Optical apparatus having lens-system drive device for temperatur

Details Optical apparatus having lens-system drive device for temperatur Optical apparatus having lens-system drive device for temperatur

1995-06-14

1998-05-19

Moses, R. L.

Photocopying

Projection printing and copying cameras

With temperature or foreign particle control

355 55, 355 67, G03B 2752, G03B 2754

Patent

active

057542759

ABSTRACT:
A photographic printing apparatus for printing an image projected from a film on to a photosensitive material is disclosed. The apparatus has a lens system for forming the image of the film located at an exposing position on the photosensitive material, a lens-system drive mechanism for supporting and moving the lens system along an optical axis thereof, a temperature sensor for detecting an ambience temperature around the lens-system drive mechanism, and a control device connected with the temperature sensor and the lens-system drive mechanism. The control device has a memory for storing position correction information for the lens system at each possible temperature and a driver for outputting a correction operation signal obtained based on the correction information to the lens-system drive mechanism. Depending on an operation condition of the photographic printing apparatus, a timing of outputting the correction operation signal from the driver to the lens-system drive mechanism is determined.

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patent: 5600496 (1997-02-01), Mori

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