Photoelectric sensor circuit comprising an auxiliary photodiode

Details Photoelectric sensor circuit comprising an auxiliary photodiode Photoelectric sensor circuit comprising an auxiliary photodiode

1997-06-10

1999-08-10

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330288, 330308, 327514, H01J 4014, G01J 144

Patent

active

059362316

ABSTRACT:
When a third transistor receives first photoelectric currents outputted from a sensing photodiode, the third transistor provides second photoelectric currents to bases of a first transistor and a second transistor, then the first transistor turns on and carries the first photoelectric currents, so first currents corresponding to the first photoelectric currents flow to a first terminal. Thus, the first photoelectric currents can be directly outputted from the first terminal. On the other hand, the second transistor also turns on and carries second currents corresponding to amplified first photoelectric currents, so the second currents flow to a third terminal. Thus, the amplified first photoelectric currents can be outputted from the third terminal.

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