Linear image sensor with varied electric charge storage time

Details Linear image sensor with varied electric charge storage time Linear image sensor with varied electric charge storage time

1991-11-05

1994-08-09

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358483, 348297, H04N 104, H04N 314

Patent

active

053371631

ABSTRACT:
The present invention is directed to a linear image sensor, the electric charge storage time of which can be varied. According to an embodiment of the present invention, there is provided a linear image sensor in which a read-out gate and a charge-transfer gate are disposed on one side of an image sensor array, and a drain gate and a drain region are disposed on the other side of the image sensor array, whereby the electric charge storage time in which a signal charge is transferred by the charge-transfer register after the signal charge is read out by the application of a read-out signal to the read-out gate and the next read-out signal is applied to the read-out gate can be varied by varying the application timing of the drain gate signal. When the linear image sensor is applied to a facsimile, the output level can be adjusted and the light and shade can be controlled by varying the electric charge accumulation time in response to the change of light intensity of a light source or by the change of scan speed of the linear image sensor.

REFERENCES:
patent: 4242599 (1980-12-01), Suzuki
patent: 4737841 (1988-04-01), Kinoshita et al.
patent: 4884142 (1989-11-01), Suzuki
patent: 5043818 (1991-08-01), Yokoyama

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