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d. Detecting the Image Density
Like carriers, the Bk toner absorbs infrared light, allowing the measurement of the density of the toner
layer on the developing cylinder. Bk toner is supplied based on the amount of consumption computed with
reference to the count of the video signals carrying a Bk component. As shown in Figure 3-541, the video
signals from the image processor are counted to obtain a cumulative count by the video data counter.
Video controller PCB
Video signal
0
Cumulative count
Bk toner supply
CL4
Toner supply signal
clutch (upper)
0
Bk toner supply
CL5
clutch (lower)
C
c
o
n
t
r
o
l
l
e
r
Figure 3-541
3-113
CANON CLClOOO REV.1 MAY lW7 PRINTED IN JAPAN (IMPRIME AU JAPON)
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