CHAPTER 2
2 - 13
COPYRIGHT ©
2000 CANON INC. CANOSCAN D660U REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
After the 1st scan, the ASIC turns signal ON to drive the solenoid to change the direction of
the refraction glass. Changing the direction of the refraction glass shifts the optical axis from
the CCD to a film by a half pixel. Therefore, the 2nd scan is performed between the pixels of
the 1st scan.
Figure 2-11
These image data are composed in the host computer to output 1200 x 1200 dpi image data.
When the ASIC commands between 601 dpi and 1199 dpi, scan is performed at 1200 dpi, then
the host computer performs resolution conversion to output the image data conforming to the
command by the ASIC.
Refraction glass
CCD
Horizontal scan
Film
Vertical scan