Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-03-15
1997-09-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250236, 250585, 2504844, G03B 4202, H04N 104
Patent
active
056659628
ABSTRACT:
An optical scanning image reader and an optical scanning image recorder are disclosed. The image reader is provided with a light source for emitting an optical beam that scans a recording material on which an image is recorded, a photodetector for reading an image by photoelectrically detecting light that has a wavelength differing from that of the optical beam and is emitted from the recording material as a result of the scanning of the recording material, and a photochromic material which increases transmissivity upon exposure to the optical beam but decreasing the transmissivity upon exposure to the emitted light. The photochromic material is positioned in proximity to, or in close contact with, the recording material, and the photodetector is positioned so as to receive the emitted light through the photochromic material. The photochromic material may have a nonlinear characteristic that increases transmissivity upon exposure to the reading optical beam but decreases a property of changing transmissivity in accordance with an optical intensity to a considerably low degree in a low optical intensity region, and the photochromic material is positioned so as to receive the reading optical beam advancing towards the recording material. Flare light advancing towards areas other than a predetermined scanning point on the recording material cannot pass through the photochromic material, and hence the influence of the flare light can be prevented.
REFERENCES:
patent: 3801825 (1974-04-01), Schwartz et al.
patent: 3887271 (1975-06-01), Yamaguchi et al.
patent: 4258264 (1981-03-01), Kotera et al.
patent: 4577098 (1986-03-01), Ogawa
patent: 4582988 (1986-04-01), Aagano
patent: 4629890 (1986-12-01), Goto et al.
patent: 4800276 (1989-01-01), Noguchi
patent: 5081356 (1992-01-01), Horikawa
patent: 5461238 (1995-10-01), Hara et al.
Fuji Photo Film Co. , Ltd.
Lee John R.
Westin Edward P.
LandOfFree
Image reader and image recorder with interposed photochromic mat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image reader and image recorder with interposed photochromic mat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image reader and image recorder with interposed photochromic mat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-71911