H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/54
H04N 3/15 (2006.01) H04N 5/238 (2006.01)
Patent
CA 1329949
ABSTRACT OF THE DISCLOSURE A circuit for driving a CCD image sensor includes a high-speed pulse generating circuit generating a first high- speed pulse train (sweeping pulse train) having pulses to be used to discard non-signal charges during the vertical blanking period and a second high-speed pulse train (high-speed transfer pulse train) having pulses of a number equal to the number of the light-sensing elements in each row and used to quickly transfer the charges from the imaging area to the storage area in the vertical blanking period. There is also included a gate pulse generating circuit generating a first gate pulse to take the accumulated charges out of each row of light-sensing elements at a point in time after the first high-speed pulse train is generated and before the second high-speed pulse train is generated and a second gate pulse to take out non-signal charges accumulated in each row of the light-sensing elements at an arbitrary point in time after the generation of the second high-speed pulse train and before the generation of the first high-speed pulse-train, during the field period (active video period). The invention shortens the charge-accumulation time in the imaging area without using a mechanical shutter.
523518
Ikeda Sadayuki
Inoue Hidehiko
Nagai Kiyotake
Nakajima Hiroshi
Ushiyama Yasuichi
Corporation Nec
Smart & Biggar
LandOfFree
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