Facsimile and static presentation processing – Facsimile – Picture signal generator
Patent
1987-08-27
1989-08-15
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Picture signal generator
35821315, 358447, 250578, H04M 1024
Patent
active
048580228
ABSTRACT:
A contact-type image sensor has amorphous semiconductor photoconductive cells formed on a substrate and divided into cell units each consisting of a number of cells. A drive signal generator is connected to the cells to sequentially select the cell units, thereby sequentially activating the cells of any selected unit. A signal readout circuit is connected to the cell units, for generating a series of pixel signals from pixel currents sequentially supplied from the cells of any selected unit. The signal readout circuit includes a common signal output line connected to the cell units, and a capacitor component connected to this output line, for sequentially accumulating the pixel currents. The capacitor component is not a discrete element, but is equivalent to the sum of the stray capacitance components inherently present in the image sensor, such as parasitic capacitance components and the coupling capacitance between the output line and the ground. An analog switch is connected between the common signal output line and the ground. The analog switch operates in response to a control pulse signal supplied from a switch controller, thereby to reset the common signal output line every time one of the cells of each unit cell is designated after a pixel current is read out from another cell adjacent to this cell. Since the output line is thus reset, and the capacitor component is thereby initialized, the attenuation ratio of each pixel current signal can be reduced.
REFERENCES:
Yamamoto et al., "A Contact Type Linear Photodiode Array Using Amorphous Thin Film", Japanese Journal of Applied Physics, vol. 17, 1977, pp. 135-140.
IEDM Tech. Dig. 1981, pp. 309-312; "A 2048-Element Contact Type Linear Image Sensor for Facsimile"; K. Komiya et al.; 1981.
Toshiba CCD Image Sensor Data Book '85-7; Toshiba Corp; Jul. 1985.
Coles Sr. Edward L.
Kabushiki Kaisha Toshiba
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