Picture pick-up device with an image sensor in the form of a cha

Details Picture pick-up device with an image sensor in the form of a cha Picture pick-up device with an image sensor in the form of a cha

1987-06-03

1989-01-31

Hix, L. T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821317, H04N 314

Patent

active

048020117

ABSTRACT:
An image sensor (PSR) in the form of a charge transfer device comprises picture pick-up elements (p) for converting incident radiation into electric charge and a charge transfer shift register (SR) for periodically shifting the charges under the control of clock pulses (S1) to a sensor output terminal (TSR) for the supply of a pulsatory picture signal with periodically occurring reset pulses and picture signal pulses. The output terminal (TSR) is succeeded by a series arrangement (SC) of at least a signal clamping circuit (CL) for the reset pulses, a resettable signal smoothing and hold circuit (SS) for the picture signal pulses and a signal sampling circuit (SH) for the picture signal pulses. By virtue of the signal smoothing it is achieved that interferences have a minimum influence on the picture signal sample values. The signal smoothing and hold circuit (SS) is in the form of, for example, a peak voltage detector or of a current source integrator for the picture signal pulses. Besides, for performing a defective picture pick-up element correction an on-off switching circuit (SW) is present between the signal clamping circuit (CL) and the resettable signal smoothing and hold circuit (SS), while the resetting at the signal smoothing and hold circuit (SS) is switched off when the switching circuit (SW) is switched off.

REFERENCES:
patent: 4167755 (1979-09-01), Nagumo
patent: 4189751 (1980-02-01), Nagumo
patent: 4549215 (1985-10-01), Levine
patent: 4556800 (1985-12-01), Ohta et al.

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