Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-07-22
1993-06-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356236, G01J 142
Patent
active
052218406
ABSTRACT:
Apparatus for scanning an information medium, such as laser scanning apparatus, includes a light collector which has high light collection efficiency, which is easy and economical to manufacture, and which efficiently shades photodetectors from scattered transmitted light. The collector includes first and second members joined together to form a light collecting cavity, with diffusely reflecting surfaces facing the cavity. The members extend the length of the scanning region and are formed from longer lengths of extrudable material. The members have ends which form a slot adjacent to the light scanning region for receiving light transmitted through the information medium into the collection cavity and which have information medium guiding features. The second member has a recessed channel, extending the length thereof, for mounting photodetector(s) and has light baffle segments at the mouth of the recess to prevent light received into the cavity through the collector slot from directly impinging on the mounted photodetectors and to prevent light singly reflected within the cavity from impinging on the photodetectors. Thus, only diffusely reflected light is detected by the photodetectors.
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Eastman Kodak Company
Hantis K. P.
Nelms David C.
Noval Willaim F.
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