Browse Prior Art Database

Charge Coupled Device Scanner Having Simultaneous Readout, Optical Scan and Data Rate Enhancement

IP.com Disclosure Number: IPCOM000079316D
Original Publication Date: 1973-Jun-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Bankowski, WF: AUTHOR [+2]

Abstract

A charge-coupled device (CCD) scanner is shown schematically in Fig. 1 having a CCD shift register located on either side of a photosensor for readout.

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Charge Coupled Device Scanner Having Simultaneous Readout, Optical Scan and Data Rate Enhancement

A charge-coupled device (CCD) scanner is shown schematically in Fig. 1 having a CCD shift register located on either side of a photosensor for readout.

The photosensor consists of a polysilicon line, which has thin silicon dioxide pockets and blocks of metallization (optical blocks).

The polysilicon line is the "optical sense" line and is switched from ground to -10v during an optical sensing operation. After completion of the optical integration in the photosensor, the analog data is shifted from the sensor to the data shift registers (A&B), as shown in Fig. 1, via a transfer gate.

The information is gated from the photosensor simultaneously with alternate data going to opposite shift registers, as depicted in Fig. 1. Subsequently the transfer gates are disabled and the two shift registers are synchronously operated. The data in these registers flows from left to right at approximately 1 M bit rate. As a bit of data from register A is extracted at the tap, there is no data present at the corresponding tap of register B, consequently the taps from registers A&B can be Dot-ORed resulting in an output data rate of 2 M bits. The shift registers can be partitioned to contain as many taps as necessary to obtain a higher data rate. The data coming out of a pair of taps is correctly organized, with respect to the order of the data in the photosensor. The actual realization...