l-4. Disc drive unit
1) Configuration of disc drive unit.
[Optical block specifications]
Optical block ass'y
Specification
Optical system
Drive unit
I
Object lens
I
Focus error
Tracking error
Laser beam
CD system OPT
Tilt sensor
DVD system OPT
Non-deflection,
unlimited optical system
Glass
Stigmatic system
DPD system
650nm
Thread motor
Configuration of thread system
DC system OPT
Non-deflection,
limited optical system
(laser coupler)
Plastic
I
Differential 3-division system
TPP system
780nm