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Proceedings Paper

New tracking method for two-beam optical heads using continuously grooved disks
Author(s): Mitsuru Irie; Nobuo Takeshita; Teruo Fujita; Kenjiro Kime
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Paper Abstract

A new composite tracking method suitable for a two-beam split-type optical head is suggested. Using twin spot and push-pull tracking method, and with ana auxiliary actuator combined, this method is designed so as to be applied, in particular, to optical disks having continuous grooves. In this method, a read-out spot is controlled by the twin-spot method, and moreover an auxiliary actuator for write spot positioning is driven by a differential signal of two push-pull tracking error signals derived from read-out and write beams. To examine tracking performance of this method, we constructed a two-beam optical head and successfully confirmed that the two spots could be easily positioned on the same track center independent of +/- 100 micrometers objective lens shift.

Paper Details

Date Published: 1 July 1991
PDF: 6 pages
Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); doi: 10.1117/12.45927
Show Author Affiliations
Mitsuru Irie, Mitsubishi Electric Corp. (Japan)
Nobuo Takeshita, Mitsubishi Electric Corp. (Japan)
Teruo Fujita, Mitsubishi Electric Corp. (Japan)
Kenjiro Kime, Mitsubishi Electric Corp. (Japan)

Published in SPIE Proceedings Vol. 1499:
Optical Data Storage '91
James J. Burke; Thomas A. Shull; Nobutake Imamura, Editor(s)

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