COPYRIGHT © 1999 CANON INC. CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
6-31
CHAPTER 6 IMAGE FORMATION SYSTEM
C. Controlling the Concentration of Color Toner
1. Outline
To determine the length of time for color toner supply operation, the concentration of color
toner on the developing cylinder is measured, thereby computing the change in toner density.
Then, the density of the sample image on the photosensitive drum is measured to detect the change
in toner density on the photosensitive drum.
These two items of data are used to determine the amount of toner to be supplied from the
hopper.
Table 6-402 shows the major functions of the color toner concentration mechanism:
Table 6-402
The following shows the flow of operations used to supply color toner:
Item
Description
Detecting the concentration
Light is directed to the developer, and the reflected light
is measured (photo detection).
Controlling the initial concentration
Measures the concentration of the starter developer at
(reference concentration)
time of installation or replacement of the developer.
Measuring the concentration of toner
Measures the concentration of the developer on the
developing cylinder during copying operation.
Controlling the toner supply operation
The initial concentration and the concentration during
copying operation are compared to determine the
amount of toner to supply.
Controlling LED deterioration
Light coming directly from the LED is measured by the
photodiode used for the generation of reference signals
to find out the degree of deterioration in the intensity of
the LED.
Measuring and generating
Measures the density of the sample image on the
the image density on the drum
photosensitive drum.
Computes the change in toner density from two items of data
(concentration on the developing cylinder and on the photo]
sensitive drum) to determine the amount of color toner to supply.
Copy Start key ON
Measures the concentration of toner on the photosensitive drum for
every 20 copies.
1st copy Measures the concentration of toner on the developing cylinder.
2nd copy Measures the concentration of toner on the developing cylinder.
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