Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1997-11-26
1999-12-14
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25022724, G06K 500
Patent
active
06002139&
ABSTRACT:
An image input device includes a light source, a light guide for guiding the light, a first and a second low refractive index layer formed on surfaces of the light guide, the first and second low refractive index layers having a lower refractive index than that of the light guide, a light input device to make the light from the light source incident onto the light guide so that the incident light is totally reflected at the boundary of the light guide with the first or second low refractive index layer, a photoelectric converter, the photoelectric converter being disposed on the second low refractive index layer and an optical element having a plurality of lenses optically contacted with the surface of the light guide via the first low refractive index layer, the optical element taking out part of the light traveling in the light guide to illuminate a document and collecting reflected light from the document onto the photoelectric converter by means of the lenses.
REFERENCES:
patent: 5416608 (1995-05-01), Ueda et al.
patent: 5430462 (1995-07-01), Katagiri et al.
Le Que T.
Sharp Kabushiki Kaisha
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