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12 February 1992
5.4 PATTERN ERASE
The erase lamp unit has another task besides the lead edge erase, trail edge
erase, and side erase which is making the ID sensor pattern, V
V
pattern.
L
When in the ID sensor pattern detection cycle, the lead edge erase period is
a little longer to make the ID sensor pattern before the original latent image.
The ID sensor pattern is made by turning off the LED blocks X, Y, Z on the
rear side for 133 msec. before making the lead edge erase margin.
When in the V
pattern detection cycle, the entire line of the erase lamp
R
LEDs turn on a little longer than the normal lead edge erase period. The V
pattern is made by applying a development bias of 0 V for the erased drum
surface before the original latent image.
When in the V
pattern detection cycle, the trail edge erase stays longer than
L
the normal copy cycle. The exposure lamp turns on at the scanner home
position and the LED blocks A, B, C of the front side turn off for 111 msec. 4
times at 833 msec. intervals. (4 times a 20 X 20 mm V
intervals)
A B C
V
Pattern
L
2-43
X Y Z
ID
Sensor
Pattern
R
pattern at 150 mm
L
ERASE
pattern, and
R
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