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LASER OPTICAL UNIT
7 - 10
7.4
Polygonal Motor Control Circuit
The polygonal motor is a DC motor rotated by a clock signal (PMCLK-1) output from the Laser-CPU.
This motor is controlled under PLL (Phase Locked Loop) to realize an accurate and constant rotation.
Its rotation status is converted to a status signal (PMOK-0) and then output to the Laser-CPU. PMOK-0
signal moves to a low level only when the rotation status of the motor is constant. The Laser-CPU
detects the rotation status with this signal, and emits a laser beam only when the rotation status is
constant.
Fig. 7-11
Signal
Function
Low level
High level
PMON-0
Polygonal motor ON signal
ON
OFF
PMCLK-1
Polygonal motor reference clock
-
-
PMOK-0
Polygonal motor PLL control signal
Rotating at a constant
speed
Stopping or error
IC25
Laser CPU
PMCLK-1
PMOK-0
PMON-0
Polygonal motor
+5VB
IC9
Buffer
PLG board