Epson Stylus CX3500 Series, Service Manual

Page: 68 / 206

EPSON Stylus CX3500/CX3600/CX3650/CX4500/CX4600 Revision A
OPERATING PRINCIPLES Scanner Mechanism 68
2.3 Scanner Mechanism
The Scanner Mechanism of Stylus CX3500/CX3600/CX3650/CX4500/CX4600 is
constructed of a Scanner Carriage Unit, Scanner Motor, Scanner HP Sensor, etc., in the
same way as previous A4 size scanners.
2.3.1 Scanner Carriage Mechanism
2.3.1.1 Scanner Carriage Unit Overview
The Scanner Carriage Unit is constructed of a CIS Board (including linear CCD), Rod
Lens Array, LED (light source), etc.
V
CIS Board
This takes the light information read from the document by the Rod Lens Array
and converts it to digital information using the linear CCD.
V
Rod Lens Array
Many rod-shaped lenses are arranged in parallel, and the upright multiple images
of each lens is overlapped to form a single continuous image. Compared to a
regular lens, this has the special ability to reduce the distances between images.
It can project at 1 to 1 size for imaging a linear CCD with a width identical to an
A4 size document.
V
LED
The unit uses an LED for an exposure light source. Using an LED eliminates the
need for an inverter board, and power consumption is reduced.
Figure 2-13. Scanner Mechanism
Figure 2-14. Scanning image
Scanner Carriage Unit Scanner HP Sensor Scanner Carriage Shaft
Scanner Motor Timing Belt
LED Rod Lens Array
CIS Board
CCD
Scanner Carriage Unit