Diffraction based light collector

Details Diffraction based light collector Diffraction based light collector

1980-09-02

1982-02-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

250228, 350 9619, 350162R, 358293, H04N 124

Patent

active

043142834

ABSTRACT:
A light collector is provided for collecting light reflected from an information-bearing surface. In one embodiment, used in a flying spot scanning system, a generally cylindrical rod is placed adjacent the information bearing surface, the rod having photodetectors placed at the ends thereof. The rod is of glass construction with a longitudinally-extending portion thereof fabricated as a variable period diffraction grating. This grating is located proximate to the scanned surface so that incident light reflected from the surface strikes the grating and is coupled into the rod via diffraction. The grating periods are selected in conjunction with the light incidence angles as to optimize the amount of light collected by the photodetectors.

REFERENCES:
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patent: 3455637 (1969-07-01), Howard
patent: 3603730 (1971-09-01), Weigl et al.
patent: 3681527 (1972-08-01), Nishiyama et al.
patent: 3774987 (1973-11-01), Bolvin
patent: 3809455 (1974-05-01), Pekau
patent: 3845239 (1974-10-01), Granzow et al.
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patent: 3987301 (1976-10-01), O'Connor
patent: 4001581 (1977-01-01), Murata
patent: 4012585 (1977-03-01), Chen
patent: 4015081 (1977-03-01), Starkweather
patent: 4068121 (1978-01-01), Bringhurst
patent: 4180702 (1979-12-01), Sick et al.
patent: 4227769 (1980-10-01), Philips

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