Technical information

OPERATIONS AND TIMING
B. Lens Drive System
1. Outline
The lens unit is driven by the lens drive motor
(M3).
The lens drive motor also serves to move the
blank exposure shutter and is switched by the blank
shutter solenoid (SL4); see p. 3-37. When the blank
shutter solenoid (SL4) goes ON, the drive is trans-
mitted to the lens drive pulley to move the lens unit.
WhenthepowerisswitchedON, SL4goesON to
rotate the lens drive motor, thereby moving the lens
to the home position. When the lens reaches the
home position, the lens drive motor rotates in re-
verse; it then stops after the signa1 plate has left the
sensor (Qi) and a specific number of pulses has
been generated, positioning the lens at the DIRECT
position.
Likewise, the lens is first moved to the home po-
sition also for both enlargement and reduction op-
erations; it is then moved and positioned at a point
suited to the specified reproduction ratio.
Lens drive motor
m IM3)
Blank shuner
Blank shutter d
Figure 3-12
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COPYAIGHT 0 1592 CANON IHC.
CANON NPZl20/2MO REY.0 MAY 1590 PRINTEO IN JAPAN IIMPAIME AU JAPONI