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Proceedings Paper

Compact-Size Optical Head For Magneto-Optical Disk Drive
Author(s): Teruo Fujita; Nobuo Takeshita; Morihiro Karaki; Mitsushige Kondo; Kenjiro Kime
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Paper Abstract

A compact-size optical head for magneto-optical disk drives has been developed. The head is designed to be built into a disk drive which is of the same size as a full-height, 5.25" floppy disk drive. By using a newly developed semiconductor laser that can radiate a beam with a small divergent angle and of small eccentricity, we have attained simplification of a collimating system and ease of assembly. To obtain a high readout carrier-to-noise ratio, we have adopted the differential readout method and the high frequency superposition method. Moreover, to stabilize a focus servo system when a focused spot traverses guide grooves, we have chosen the pupil obscuration method for focus error detection. With these technologies, continuous irradiation of 8mW onto a disk surface and a carrier-to-noise ratio in excess of 50dB within 30kHz bandwidth have been achieved.

Paper Details

Date Published: 14 January 1987
PDF: 7 pages
Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987);
Show Author Affiliations
Teruo Fujita, Mitsubishi Electric Corporation (Japan)
Nobuo Takeshita, Mitsubishi Electric Corporation (Japan)
Morihiro Karaki, Mitsubishi Electric Corporation (Japan)
Mitsushige Kondo, Mitsubishi Electric Corporation (Japan)
Kenjiro Kime, Mitsubishi Electric Corporation (Japan)

Published in SPIE Proceedings Vol. 0695:
Optical Mass Data Storage II
Robert P. Freese; Albert A. Jamberdino; Maarten R. de Haan, Editor(s)

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