Canon C5000 - MultiPASS Color Inkjet Printer, Руководство по обслуживанию, Страница: 103 / 221

Chapter 2: Technical Reference
Reading color documents
When scanning a line of color LED’s are sequentially lit: first Red, then
Green, then Blue. The corresponding image data line are then read and stored to
memory. The Red, Green and Blue LED’s are mounted on the white LED board at the right
side of the contact sensor. The light emitted from
LED’s passes through the optical
guide, where it is reflected, gathered. at the document.
During color copying, the SCNT board’s Color Image Processing IC UC the
data in memory for each color generate print image data for the colors Cyan,
Magenta, Yellow, and Black CMYK data Generation of CMYK data is independent
from the reading contact sensor data.
data generation is slower than the
reading process, reading is halted until data generation is completed.
When using the unit as a color scanner, Red, Green and Blue data which were scanned
and stored to memory are converted to data and sent to the PC via the Centronics
interface.
8.1.3 Reading black white documents
When scanning black and white Green and Blue LED’s are lit
sequentially for the duration used color providing illumination equivalent
to the duration of white light.
G 8.
Figure 2-23 Contact Sensor
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