New tracking method for two-beam optical heads using continuously grooved disks

Mitsuru Irie; Nobuo Takeshita; Teruo Fujita; Kenjiro Kime

doi:10.1117/12.45927

1 July 1991 New tracking method for two-beam optical heads using continuously grooved disks

Mitsuru Irie, Nobuo Takeshita, Teruo Fujita, Kenjiro Kime

Proceedings Volume 1499, Optical Data Storage '91; (1991) https://doi.org/10.1117/12.45927
Event: Optical Data Storage, 1991, Colorado Springs, CO, United States

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.

Citation Download Citation

Mitsuru Irie, Nobuo Takeshita, Teruo Fujita, and Kenjiro Kime "New tracking method for two-beam optical heads using continuously grooved disks", Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); https://doi.org/10.1117/12.45927

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