Browse Prior Art Database

High Resolution, Self Scanning Line Imager

IP.com Disclosure Number: IPCOM000084683D
Original Publication Date: 1975-Dec-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Arellano, AG: AUTHOR

Abstract

A high resolution, high sensitivity page width line scanner is shown, which comprises a photoconductor strip as an image sensor and a simple metal-oxide semiconductor (MOS) technology shift register as a readout means.

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High Resolution, Self Scanning Line Imager

A high resolution, high sensitivity page width line scanner is shown, which comprises a photoconductor strip as an image sensor and a simple metal-oxide semiconductor (MOS) technology shift register as a readout means.

The scanner is made by using a long strip of photoconductor 10 such as CdS and a MOS shift register 12 having bit positions 1 through n as a scanning means. The photoconductor 10 is illuminated through a slit by the image to be scanned, and the photoconductor responds to the image intensity by a change in local resistance. By multifinger electrodes 14, the shift register 12 can sequentially sample the resistance of the photoconductor 10 along the length of the image. The resistance is sampled by applying a voltage source 16 through one of the multifinger electrodes 14 and sensing the resultant current in a common electrode 18.

In response to a clocking signal at input terminal 20, the shift register active stage 1-n is operative to close the corresponding switching S1-Sn to transfer the sampling voltage V from one electrode 14 to the next along the chain, thereby producing a serial output signal from the common electrode 18. The resultant serial current signal can be applied directly to an output terminal, or alternately to an "on chip" amplifier and the resultant buffered voltage is then applied to the output terminal.

One method of construction is to build the scanner on a silicon substrate, in which cas...