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COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
3–3
CHAPTER 3 EXPOSURE SYSTEM
II. LENS DRIVE SYSTEM
A. Driving the Lens
1. Outline
The lens is driven by the lens motor (M3) and the mirror motor (M4).
As shown in Figure 3-201, when the lens motor rotates in normal direction, the lens moves in
the direction of Enlarge by the drive coming through gears and drive belt.
At this time, the No. 4/No. 5 mirror unit moves by the drive coming from the mirror motor in
the direction of Enlarge/Reduce according to how much the lens moves (reproduction ratio),
thereby varying the optical length.
Figure 3-201
DC
controller
PCB
Lens home position
sensor (PS2)
Mirror home position
sensor (PS3)
Mirror motor (M4)
Enlarge/Reduce
Mirror motor drive command
Mirror home position
detection signal (MRRHP)
Direct
Enlarge
CW
CCW
Lens home position detection signal (LNSHP)
Reduce
Lens
motor (M3)
Lens
motor
drive command