Ricoh C211 Service Manual page 40

1.5.1 Function
The principle circuit of each pixel in the CCD is shown above, The light
reflected from the original is absorbed in the photodiode and the capacitor
stores the charge corresponding to the light intensity.
The CCD is composed of many such pixel elements in series. The image
signal of each pixel element is stored in the shift register as a charge.
When the SH signal is input, the image signal stored in the shift register, is
output in serial as the OS signal.
SH : Shift Gate
The storage electrode charge in the exposure section is transmitted to the shift
register by the shift gate pulse.
@lE, +2E Clock (Phase 1)
This is the transmission clock for analog shift register 2 (even pixels).
@lO, @20 Clock (Phase 2)
This is the transmission clock for analog shift register 1 (odd pixels).
The shift gate signal transmits the electrical charge in parallel to either analog
shift register 1 or 2 (odd or even pixels). At the same time, the photo signal
storage of the next scan line starts in the exposure section.
The transmission clocks serially shift the electric charge transmitted to the shift
register, which outputs it from the OS (output signal) terminal.
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