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Proceedings Paper

New Optical Head for Magneto-optic Library Units
Author(s): M. Moritsugu; S. Arai; A. Futamata; F. Abe; K. Ogawa
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Paper Abstract

We have developed a magneto-optical head to provide both fast access and large memory capacities for optical library systems. It features a pair of optical heads which face each other on opposite sides of the disk, and a new tracking method which enables a wide tracking range. The bias coil to generate the magnetic field is mounted around the objective lens of each optical head. The two opposing bias coils can generate an interlocking magnetic field of more than 250 Oe. We call this bias-coil driving method the push-pull driving. The power consumption needed for a 250 Oe field is only 2 W. A new tracking method makes it possible to use a stepping motor for coarse access. Two stepping motors are used not only for on-media access but also for media-to-media access, which help to miniaturize the drive. A good magneto-optical readout signal was obtained. Its carrier-to-noise ratio is more than 50 dB for a mark length of I gm. We confirmed that this signal level is sufficient for recording on magneto-optical disks.

Paper Details

Date Published: 19 May 1989
PDF: 7 pages
Proc. SPIE 1078, Optical Data Storage Topical Meeting, (19 May 1989); doi: 10.1117/12.952753
Show Author Affiliations
M. Moritsugu, Fujitsu Laboratories Ltd. (Japan)
S. Arai, Fujitsu Laboratories Ltd. (Japan)
A. Futamata, Fujitsu Laboratories Ltd. (Japan)
F. Abe, Fujitsu Laboratories Ltd. (Japan)
K. Ogawa, Fujitsu Laboratories Ltd. (Japan)

Published in SPIE Proceedings Vol. 1078:
Optical Data Storage Topical Meeting
Gordon R. Knight; Clark N. Kurtz, Editor(s)

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