Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-06-02
1997-01-21
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
36441319, H01J 314
Patent
active
055961908
ABSTRACT:
A light collection device for use in a film image digitizing apparatus comprises a housing having an elongated aperture extending along a light beam scan line. The aperture receives light transmitted through a sheet of film from a light source. A diffusing member, disposed within the aperture and extending along the scan line, optically diffuses the light received by the aperture. The housing may include one or more reflective interior surfaces. A linear array of photodiodes, disposed within the housing and extending along the scan line, detects the light diffused by the diffusing member. Each of the photodiodes generates an analog signal representing an intensity of the detected light for each of a plurality of pixels. A summing circuit, coupled to each of the photodiodes, sums the analog signals generated by the photodiodes for each of the pixels to produce an output analog signal representing an overall intensity of the light transmitted through the sheet of film for each of the pixels.
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Joyce Terrence H.
Lemberger Richard R.
Li Yun Z.
Schubert Paul C.
Warren Jack K.
Bates Carolyn A.
Le Que T.
Minnesota Mining and Manufacturing Company
Shumaker Steven J.
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