COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR105 REV.0 JULY 2001CHAPTER 2 NEW FUNCTIONS2-393.3 4-Channel High-Speed Reading CCDTo support high-speed reading at 80 ipm, the machine uses a 4-channel high-speed read-ing CCD. It consists of two CCDs connected to form a single entity (each, half length of acommon CCD); the entire CCD is divided in the middle into first half and last half.Reading starts simultaneously at both left and right sides, thereby cutting the data transfertime required for reading by half and ultimately enabling high-speed reading.The image data is divided into 4 channels: first-half even-numbered pixels, first-half odd-numbered pixels, last-half even-numbered pixels, and last-half odd-numbered pixels. Thefollowing diagram shows how CCD data is transferred:F02-303-01Direction of charge transferDirection of charge transferDirection of charge transferDirection of charge transfer3750 3749 3748 374737513752375337547500 7499 7498 7497 4 3 2 1Outputunit AOutputunit BOutputunit COutputunit DCCDshiftpulseTransfer unit AClock pulse BClock pulse DClock pulse AClock pulse CTransfer unit BTransfer unit CTransfer unit DLight-receivingunit
