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C156-E142-02EN 1 - 7
1.2.2 Configuration
Figure 1.3 shows the drive configuration.
The drive consists of mechanical sections, a fixed optics section, actuator, and a control circuit
section. The mechanical sections include the spindle motor, actuator section, bias magnet, and the
cartridge folder vertical motion mechanism.
The fixed optics section consists of the optical components, position detector, and LD controller.
The control circuit sections include the drive control circuit section and ATAPI controller section.
Figure 1.3 Optical disk drive configuration
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 4,558 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.
Fixed optics sectionActuator section
Control circuit section
Spindle motor
Optical disk cartridge