Electrical pulse counters – pulse dividers – or shift registers: c – Charge transfer device – Compensating for or preventing signal charge deterioration
Patent
1991-08-09
1992-04-14
Munson, Gene M.
Electrical pulse counters, pulse dividers, or shift registers: c
Charge transfer device
Compensating for or preventing signal charge deterioration
357 24, 357 30, 35821326, 35821329, 35821331, G11C 1928, H01L 2978, H04N 314, H01L 2714
Patent
active
051054507
ABSTRACT:
There is provided a charge transfer device comprising a shift register comprised of a plurality of shift stages directly connected to each other, phase pulses for a multi-phase control pulse being delivered to the shift stages, respectively, a transfer control pulse being delivered to the shift register stage arranged at one end of the plurality of shift stages; and a transfer unit having a plurality of transfer electrodes provided in correspondence with the shift stages of the shift register, transfer pulses being delivered from the shift stages of the shift register to the transfer electrodes, respectively, to apply transfer pulses in a predetermined order from the shift stages of the shift register to the transfer electrodes of the transfer unit, respectively, to thereby sequentially transfer signal charges stored below the transfer electrodes in a predetermined direction. In this device, the transfer electrodes are such that transfer electrodes having a large electrode area and transfer electrodes having a small electrode area are arranged one after other, and that they are connected to the respective stages of the shift register in order. It is desirable that the area relationship of the transfer electrodes is such that the ratio between transfer electrodes having a large electrode area and a small electrode area is set to a sufficiently large value. This charge transfer device is combined with a photoelectric conversion unit comprised of a plurality of photosensitive elements to constitute a solid state image pickup device.
REFERENCES:
patent: 4178614 (1979-12-01), Sauer
patent: 4868855 (1989-09-01), Boudewijns et al.
patent: 4903284 (1990-02-01), Esser
Theuwissen et al., "The Accordion Imager: an Ultra High Density Frame Transfer CCD", IEEE Int. Electron Devices Meeting (12/84), Dig. Tech. Papers, pp. 40-43.
Kabushiki Kaisha Toshiba
Munson Gene M.
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