Photosensor circuit having an initial setting unit

Details Photosensor circuit having an initial setting unit Photosensor circuit having an initial setting unit

1997-09-09

1999-01-19

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

348297, 257290, H01J 4014

Patent

active

058616217

ABSTRACT:
A photosensor circuit comprises a photoelectric transducer, an n-channel MOS transistor and an initial setting unit for precluding the occurrence of a residual image phenomenon. When an optical signal is generated by the photoelectric transducer, the initial setting unit sets the gate voltage of the n-channel MOS transistor at a high value for a predetermined time to lower the drain-source impedance of the n-channel MOS transistor to thereby control charge or discharge of a capacitor connected to a source terminal.

REFERENCES:
patent: 4839735 (1989-06-01), Kyomasu et al.

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