Toshiba e-STUDIO281c Service Manual page 145

6. SCANNER
6.1 General Description
In the scanning section of this equipment, the surface of an original is irradiated with a direct light and
the reflected light is led through mirrors, a lens and a slit to CCD where optical-to-electrical conversion
is performed, converting the optical image data into an electrical (analog) signal. This analog signal is
changed to a digital signal, which then undertakes various corrective processes necessary for image
formation. After that, arithmetic operation is performed on the digital signal, which is then transmitted to
the data writing section.
In this equipment, a reduction-type CCD for color processing is used. What this CCD differs from black-
and-white CCDs is that its devices are arranged in 4 lines and covered with color filters (Red, Green,
and Blue). These lines are composed with 3-line color devices and black-and-white device with no filter.
Lens
RADF original glass
6
Reflector Original glass
Exposure lamp
Drive pulley
Rail for carriage-2
Rail for carriage-1
Carriage-2
SLG board
Carriage-1
CCD board
Fig.6-1
June 2005 © TOSHIBA TEC e-STUDIO281c/351c/451c SCANNER
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