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13 August 1992 Servo technology for three-beam overwritable magneto-optical disk drive
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Proceedings Volume 1663, Optical Data Storage; (1992)
Event: Optical Data Storage Topical Meeting, 1992, San Jose, CA, United States
Two kinds of high-speed lens actuators and a positioning control method have been developed for a 3-beam overwritable magneto-optical disk drive, which has a data transfer rate of 2.1 MB/s and an average access time of less than 50 ms for ISO standard 130 mm disks. Both of these lens actuators, the relay lens type and the rotary type, have higher-order mechanical resonances of more than 35 kHz, and offer stable focusing and tracking at 5400 rpm. The 3- beam positioning control method consists of a direct track-counting seek and relative position control. The velocity control for the direct track-counting seek switches from the positioner to the lens actuator when the track counter reaches a few score so as to provide stable positioning onto the track.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kikuji Katoh, Kazuki Kudo, and Ichiro Yamada "Servo technology for three-beam overwritable magneto-optical disk drive", Proc. SPIE 1663, Optical Data Storage, (13 August 1992);

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