3. OPERATION AND TIMING
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-114
e. Measuring the Toner by the SALT Sensor
To check the density of toner within the developer, a toner image is formed on the photosensitive drum
after copying operation. This measurement of density is done by the SALT sensor (Figure 3-542) mounted to
the side of the photosensitive drum. A density pattern is formed on the photosensitive drum, and infrared light
is shone against the density pattern to measure the density with reference to the reflected light.
Figure 3-542
The changes in the LED intensity over time or
caused by changes in ambient temperature are
corrected in the same way as for color toner. Since
the window of the sensor tends to become soiled
with stray toner, correction is made for the dirt on
the window also.
The LED is turned on during last rotation after
copying operation, and the light reflected by the
surface of the photosensitive drum without a
deposit of toner is read. The difference between
the measured value and the initial value is used as
a correction value when computing the density of
the density pattern.
Figure 3-543
Y
M
C
Bk
SALT sensor
SALT sensor
Color toner
density sensor
Transfer belt
SALT sensor
SALT sensor
DC controller
Color toner
density sensor
Color toner
density sensor
Direct intensity/re-
flected intensity
Toner supply signal
Toner supply clutch
CL
Detection of direct light
Mirror
Photosensitive drum
Detection of reflected light
LED
Direct intensity signal
Reflected intensity signal
Summary of Contents for 1000S
Page 12: ......
Page 30: ......
Page 44: ......
Page 86: ......
Page 254: ......
Page 372: ......
Page 374: ......
Page 418: ......
Page 438: ......
Page 442: ......
Page 754: ......
Page 764: ......
Page 766: ......
Page 840: ...0501GR PRINTED IN JAPAN IMPRIME AU JAPON This publication is printed on 100 reprocessed paper ...