FUJITSU MCJ3230SS - Manual (Page 31)

1.2 Drive Configuration
C156-E224-01EN 1-9
1.2.3 Mechanical sections
(1) Optical disk cartridge load/eject
The system includes a cartridge mechanism which lowers the optical disk cartridge
and mounts (loads) it on the spindle motor automatically when the optical disk
cartridge is fully inserted in the optical disk drive's disk slot, and a mechanism
which automatically ejects the cartridge when the Eject button on the front panel is
pressed.
(2) Spindle motor
Optical disk cartridge hubs are linked through magnetic clamps to minimize
slippage between the spindle motor shaft and disk. The spindle motor is the direct
drive type which rotates the disk at the same speed as the spindle motor shaft. A
DC brushless spindle motor is used. The spindle motor rotates at 5,455 rpm ±
0.1%.
(3) Actuator section
The positioner moves (seeks) a head actuator radically across the disk surface.
The positioner is driven by a linear voice coil motor. A pulse-width modulation
(PWM) is adopted as a driving system and realizes low power consumption and
high-speed access.
(4) Separate optical sections
The optical head section is separated in such a way that the fixed optics section
is separated from the moving optics section to minimize seek time and positioning
error. (See Subsection 1.2.4 for the fixed optical section.) This reduces the weight
of the moving parts.
The fixed optics section consists of the laser diodes, collimator lens, and optical
detector.
The fixed optics section includes a laser diode for recording and playback, and
transmits one laser beam to the head actuator.
(5) Panel
The central part of the panel is hollowed out deeply to provide pushing finger
space for inserting the cartridge, thereby facilitating the insertion.
The panel is also simply designed by making the eject button and LED light
emitting part integral with each other.