Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1987-10-05
1989-04-11
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250226, 357 2, H01J 4014
Patent
active
048209155
ABSTRACT:
A color sensor has a layered body obtained by stacking a first photoelectric sensor which is constituted by an amorphous semiconductor having a "PIN" structure and a spectral sensitivity which has a peak with respect to blue light and a second photoelectric sensor which is constituted by an amorphous semiconductor having a "PIN" structure and a spectral sensitivity which has a peak with respect to red light, so that a p-n junction is formed therebetween, and a pair of electrodes with each of the electrodes being provided at a respective end of the body, at least one of the pair of electrodes being transparent. A color measuring apparatus uses the color sensor with a bias voltage supply for supplying three different bias voltages between the sensor and the pair of electrodes, a photo-current detector for detecting photo-currents for each bias voltage and a color discriminator for discriminating incident light color on the basis of the detected photo-currents.
REFERENCES:
patent: 2986591 (1961-05-01), Swanson et al.
patent: 4011016 (1977-03-01), Layne et al.
patent: 4271328 (1981-06-01), Hamakawa et al.
patent: 4616246 (1986-10-01), Delahoy
Hamakawa Yoshihiro
Koike Funio
Miyagishi Tetsuya
Halista Mitchell J.
Medved Albin
Nelms David C.
Yamatake-Honeywell Co. Ltd.
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