Lens Drive - Ricoh A219 Service Manual

OPTICS

3.3 LENS DRIVE

[D]
[A]
The lens motor [A] (stepper motor) changes the lens [B] position through the
timing belt [C] in accordance with the selected reproduction ratio to provide
the proper optical distance between the lens and the drum surface.
The rotation of the lens drive pulley moves the lens back and forth in discrete
steps. The home position of the lens is detected by a home position sensor
[D]. The main board keeps track of the lens position based on the number of
pulses sent to the lens motor.
A219
CÓPIA NÃO CONTROLADA
[B]
2-8
CÓPIA NÃO CONTROLADA
[C]
A219D509.wmf
: Reduction
: Enlargement
SM