Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-07-28
1985-01-22
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 961, 358200, G02B 514, G06K 710
Patent
active
044954123
ABSTRACT:
The device comprises a transducer (3) comprising a row of photoelectric elements (27), and a coupling member (7) with an entrance (11) which is to be directed towards the document (1) and an exit (13) which is coupled to the transducer. The coupling member is constructed as an integrated optical waveguide circuit comprising a glass substrate (17) in which there are provided grooves (19) which, in order to form optical conductors (21), are filled with a glass having a refractive index which is higher than that of the glass of the substrate. The width of each groove gradually decreases from the entrance of the coupling member towards the exit and over the entire length of the grooves the distance between every two adjacent grooves is substantially constant and substantially smaller than the width of the grooves, so that substantially all light originating from a scanned line of the document is supplied to the transducer.
REFERENCES:
patent: 3663083 (1972-05-01), Friedman et al.
patent: 4010364 (1977-03-01), Fuwa
patent: 4233506 (1980-11-01), Yamamoto et al.
patent: 4287414 (1981-09-01), Soo et al.
Gustin Pol A. G. J.
Khoe Giok D.
Kuppers Dieter
Thoone Martinus L. G.
Mayer Robert T.
Tamoshunas Algy
U.S. Philips Corporation
Westin Edward P.
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