Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1986-01-13
1987-12-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
307311, H01J 4014
Patent
active
047148276
ABSTRACT:
A photo-electric conversion device includes a first photodiode in which a current is changed in accordance with a light intensity; a second photodiode which is connected to the first photodiode and in which a current flows in the same direction as that in the first photodiode; a light shielding structure for shielding the second photodiode with regard to light; a capacitor, connected in parallel with the second photodiode, for charging/discharging a current from the first photodiode; and an oscillator circuit for performing a switching operation in accordance with the charging/discharging operation of the capacitor so as to generate an oscillation voltage output. The light intensity is thus converted into a frequency of the oscillating voltage, and dark current in the first photodiode is discharged through the second photodiode such that the capacitor is always charged only by a current caused by received light detected by the first photodiode.
REFERENCES:
patent: 3045125 (1962-07-01), Mason
patent: 4356393 (1982-10-01), Fayfield
Nelms David C.
Nippon Soken Inc.
Seo Chung K.
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