G - Physics – 03 – B
Patent
G - Physics
03
B
G03B 27/72 (2006.01) G03B 27/54 (2006.01) G03B 27/80 (2006.01)
Patent
CA 2297397
Method for the optimization of a copying light profile during copying of photographic originals in a photographic copier, whereby the copier includes at least the following: a light source for producing copying light for the copying process, a number of optical, light conducting means for guiding the copying light along a light path from the light source through the photographic original to a copier material as well as for the shining through of the photographic original and for the projection of the shone through original onto the light sensitive copier material, and a local transmission modulator through which the copying light is guided by way of the light conductive means, before it exposes the copier material, the transmission of which is controllable locally for the production of a transmission profile and the transmission profile of which is preselected for the copying process in dependence of the photographic original to be copied, whereby the method includes the following steps: a) providing either a transparent element with a known transmission profile in the light path for being shone through for measuring a profile of the copying light, or no transparent element, whereby no photographic original to be copied and of unknown transmission profile is found in the light path and furthermore a transmission profile specific for the local transmission modulator is provided, b) the copying light resulting because of step a) is measured broken down by area, the profile of the copying light is measured and compared with a desired copying light profile, c) for the copying of photographic originals onto copier material, based on the comparison in step b) the transmission profile respectively preselected for the respective copying process is optimized.
Kraft Walter
Nussbaumer Max
Borden Ladner Gervais Llp
Gretag Imaging Trading Ag
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