Toshiba 4511, 3511 manual Scanner, Function

6. SCANNER

6.1 Function

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.

	Reflector	Original glass		Lens
Rail for carriage-2	Exposure lamp		Rail for carriage-1	Drive pulley

Carriage-2

Carriage-1	SLG board
	CCD board

Fig. 6-101

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November 2003 © TOSHIBA TEC 6 - 1 e-STUDIO3511/4511 SCANNER