Optical memory apparatus and focus servo control method

Optical memory apparatus using an optical disc having guide-groo

Optical memory disc driving apparatus

Optical memory system having track following

Optical memory system providing track following

Optical parts driving mechanism in optical information reader

Optical pick up and optical disc device having optical...

Optical pick up device

Optical pick-up

Optical pick-up

Optical pick-up

Optical pick-up actuator

Optical pick-up actuator

Optical pick-up actuator

Optical pick-up actuator using a concentrated magnetization

Optical pick-up and optical disk device

Optical pick-up aparatus

Optical pick-up apparatus

Optical pick-up apparatus capable of reading data irrespective o

Optical pick-up apparatus with holographic optical element to di