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US 4,394,570 AGranted
Photoelectric conversion circuit
AssigneeOlympus Optical Co., Ltd.
InventorKazunori Mizokami
Life of this patent
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Abstract
A photoelectric conversion circuit comprises a pair of cascade connected semiconductor switching circuits, each of which is formed by a CMOS inverter. A pair of oppositely poled, series connected photodiodes define a photometric, photoelectric transducer element. A capacitor is arranged to be charged and discharged in response to a photocurrent from the transducer element. The combination of the transducer element and the capacitor form a feedback circuit which is connected across the switching circuits to cause the latter to oscillate.
Claims5
A photoelectric conversion circuit comprising:
- a pair of series connected photodiodes having first and second connection points;
- a capacitor having one side thereof connected to said first connection point of said photodiodes and arranged to be charged and discharged in response to a photocurrent from said photodiodes;
- first and second semiconductor switching circuits, wherein the output of said first switching circuit is connected to the input of said second switching circuit to form a junction, and wherein said second connection point of said photodiodes is connected to said junction;
- and
- the combination of said photodiodes and said capacitor forming a feedback circuit connected across said first and second switching circuit, whereby the switching operation of said switching circuits is effected in response to charging and discharging of said capacitor by photocurrent from said photodiodes.
2 more elements
Dependencies are inferred from the claim text.