Apparatus for making prints from colour negatives
Abstract
Abstract AN APPARATUS FOR MAKING PRINTS FROM COLOUR NEGATIVES HAS ADJUSTABLE FILTERS FOR CONTROLLING THE COLOUR COMPOSITION OF THE PRINTING LIGHT WHICH ILLUMINATES THE NEGATIVE BEING PRINTED. THE REQUIRED COLOUR COMPOSITION IS DEPENDENT ON THE COLOUR DENSITIES OF THE NEGATIVE. TO MEASSURE THE COLOR DENSITIES THE PRINTING LIGHT IS SAMPLED BOTH BEFORE AND AFTER TRANSMISSION THROUGH THE NEGATIVE AND THE SAMPLES ANALYZED IN RESPECT TO THEIR PRIMARY COLOUR COMPONENTS. THE CORRESPONDING COMPONENTS OF THE LIGHT SAMPLES BEFORE AND AFTER THE NEGATIVE ARE COMPARED TO OBTAIN DIFFERENT SIGNALS REPRESENTING THE COLOUR DENSITIES OF THE NEGATIVE. THESE SIGNALS ARE USED IN TURN TO AUTOMATICALLY ADJUST THE FILTERS FOR THE CORRECT COLOUR COMPOSITION OF THE PRINTING LIGHT. A SHUTTER IS LOCATED BETWEEN THE NEGATIVE AND THE PRINTING MATERIAL AND IS OPENED TO EXPOSE THE LATTER ONCE THE PRINTING LIGHT HAS BEEN ADJUSTED. THE LIGHT SAMPLES ARE ALSO USED TO DERIVE BRIGHTNESS SIGNALS FOR CONTROLLING THE TIME FOR WHICH THE SHUTTER IS OPENED.
Inventors
- 👤 Heiner Schaub
- 👤 Kurt Thaddey
- 👤 Tino Celio
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
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