Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1998-04-29
2000-03-21
Metjahic, Safet
Photocopying
Projection printing and copying cameras
Illumination systems or details
356399, 348131, G03B 2754, G01B 1100, H04N 718
Patent
active
060408952
ABSTRACT:
In a method and apparatus wherein components and/or markings applied to substrates are illuminated with illumination devices and imaged via a camera, adequate contrast between useful and unwanted structures is achieved even in the case of highly disparate optical properties of different materials for the substrates, components and markings by the use of an illumination device composed of a number of illumination units that respectively emit light in spectral ranges different from one another and which are thereby separately varied in intensity. This illumination with variable spectral distribution assures an adequate contrast even given the employment of different materials for the illuminated items.
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Brown Khaled
Metjahic Safet
Siemens Aktiengesellschaft
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