Functions - Toshiba e-STUDIO163 Service Manual

6.3

Functions

1) Original glass
This is a glass for placing original. Original (image) placed on the original glass is scanned by the
CIS. The ADF original glass is used when original is read with the Automatic Document Feeder.
Original is transported on the ADF original glass by the Automatic Document Feeder, and the trans-
ported original is read under the ADF original glass by the CIS. Do not use such solvents as alcohol
when cleaning the surface of the ADF original glass, because it is coated so as not to be scratched
by originals.
2) CIS unit (CIS)
The CIS unit (CIS) is a unit in which the LED array, lens array and CIS sensor of same length are
closely attached and unified. An original is irradiated with the LED light source of RGB colors in
order, and then the reflected light is scanned by the CIS sensor.
In the CCD method, the reflected light of the exposure lamp is led through mirrors, lens and slit to
the CCD where the optical-to electrical conversion for scanned data is performed. In contrast, in the
CIS method, those operations are processed by only the CIS unit.
- CIS
Scans the light reflected from an original and converts it to an electrical signal.
The CIS sensor of the equipment has 7084 image pixels and 600x600-pixel resolution for scan-
ning.
- YG-LED array
This YG-LED array works as an assist light for the RGB-LED array. Using this YG-LED array
makes it possible to attain a light color which has nearly the same color effect as that of the
xenon light for the light sensitivity of the CIS sensor.
Also it is used to reduce shadow of an original when scanning is performed.
- RGB-LED array
The surface of an original is irradiated with and the reflected light is scanned by the CIS.
A light from the LED array mounted on the CIS unit (CIS) goes through the original glass and
lights an original. And then, the reflected light from the original is scanned by the CIS. This LED
alley produces the output power of 3.2W.
- Gradient index lens
This is a lens of which the index of refraction within the lens is varied.
This lens enables us to produce a unified image without combining mirrors or lenses.
3) Scan motor (M1)
This is a two-phase stepping motor which drives the CIS unit (CIS). The rotation of the motor is
transmitted to the CIS unit through the timing belt to move the unit form side to side.
4) CIS home position sensor (S1)
This sensor detects if the CIS unit is at its home position.
December 2005 © TOSHIBA TEC
6 - 3
e-STUDIO163/203 SCANNER
6