Method of and apparatus for controlling photographic printing la

Details Method of and apparatus for controlling photographic printing la Method of and apparatus for controlling photographic printing la

1989-06-09

1990-06-19

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 69, G03B 2772

Patent

active

049357727

ABSTRACT:
The power supplied to a new printing lamp which replaces an old lamp is set automatically. The light output of the new printing lamp is measured with an exposure control sensor while the power supplied to the new printing lamp is changed in predetermined step units under control of CPU. The power supplied to the new printing lamp is fixed when the measured light amount coincides with a predetermined reference light amount. The automatically fixed lamp power is stored in a memory, and is read out therefrom to drive the new printing lamp when making a photographic print, to ensure the same light output as that of the old printing lamp.

REFERENCES:
patent: 4124294 (1978-11-01), Nakamura
patent: 4463284 (1984-07-01), Tamura et al.
patent: 4645982 (1987-02-01), Takayanagi

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