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(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 optical section consists of the laser diodes, collimator lens, and optical detector.
The laser diode for recording and playback, and transmits one laser beam to the actuator section.
(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.
1.2.4 Control circuit section
Figure 1.4 is the block diagram of the control circuit section.
Figure 1.4 Control circuit section block diagram
The control circuit section is divided into two parts: an SCSI controller section which deals
with control between the SCSI interface and drive interface, and a drive circuit section which
controls the drive.
DE
SCSI
Interface
Actuator
Focus Act.
Track Act.
Spindle Motor
Temperature Sensor
Head
Laser Diode
Photo Diode
APC Amp
LPC Amp
Head Amp
Drive
Read Amp
Power Amp
Filter
Sensor
Motor Driver
Main control
MPU
ODC
DSP
User Logic
LSI i/f
D-RAM
F-ROM
Bias Coil
Eject Motor
Cartridge Sensor