E. Automatic Exposure Control
(AE)
An automatic exposure function is used to
automatically control the intensity of the C.F.F.
lamp according to the density of the original
pages on continuous paper when the C.F.F. is
used.
With the C.F.F. in use, AE measurement is exe-
cuted by illuminating the first page only of the con-
tinuous paper with the C.F.F. lamp (LA2) while the
paper is kept stationary. While this takes place,
the surface potential of the photosensitive drum is
measured, and the result is sent to the DC con-
troller PCB.
The DC controller PCB in turn determines the
intensity of the C.F.F. lamp for copying based on
the surface potential measurement it has
received.
The C.F.F. lamp is controlled by the copier’s
lamp regulator, and the power is switched to the
scanning lamp or the C.F.F. lamp by the relay cir-
cuit inside the lamp regulator.
The intensity control mechanism for the C.F.F.
lamp is operated by the intensity adjustment sig-
nal (LINT) used for the scanning lamp of the copi-
er. For this reason, the intensity of the C.F.F. lamp
determined by the DC controller PCB is under the
control of the LINT signal.
3. OPERATIONS AND TIMING
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-168
C.F.F.
C.F.F. lamp
Continuous paper
Zoom lens
Potential sensor
Photosensitive drum
Activation
circuit
Copier
Scanning
lamp
Potential
measurement
PCB
DC control PCB
Lamp regulator
Relay circuit
LASEL
LINT
LRD
Figure 3-816
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