Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1975-08-05
1976-12-21
Peters, Jr., Joseph F.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 83, G03B 2778
Patent
active
039985474
ABSTRACT:
This invention relates to a process for automatically changing the illumination intensity of a light source in a copying apparatus in which the transparency of the original is measured with at least one light-sensitive measuring unit and in which, based on the measured transparency, a signal is passed on from this measuring unit for controlling the speed of a drive motor, comprising comparing the signal coming from the light-sensitive measuring unit and passed on for controlling the speed of the drive motor with a predetermined signal corresponding to the highest speed of the drive motor and, if the measured signal requires a higher speed than that of the predetermined signal, the difference of the two signals is formed and the illumination intensity is controlled in correspondence with this difference signal. The invention also relates to an apparatus for performing the process.
REFERENCES:
patent: 3723000 (1973-03-01), Sone
patent: 3738242 (1973-06-01), Lee et al.
patent: 3778154 (1973-12-01), Dennhardt et al.
patent: 3879125 (1975-04-01), Schroter
Dennhardt Werner
Schroter Herbert
Bryan James E.
Hoechst Aktiengesellschaft
Peters Jr. Joseph F.
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