and blue LEDs for illumination. The use of LEDs allows the CIS to be highly power ecient, allowing scanners
to be powered through the minimal line voltage supplied via a USB connection.
Principle of operation:
1. The light source is 3 RGB LEDs that are lit one at a time. The sensor consists of 14960 individual
monochrome sensors in 1200PPI.
2. The purpose of the lens is to channel the light from the “pixels” on the image to the sensors. There is no
magnication in the lens (1x1).
3. Due to the very short focal length, the focus depth is limited. The original has to be in contact with the
surface of the glass plate in order to be in focus.
4. The LEDs ash one at a time, capturing one color at a time.
ENWW Subsystems 53
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