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Conferences > ODS > 1994 > WB > WB5

Dual Focus Optical Head For 0.6mm and 1.2mm Disks

Yoshiaki Komma, Kenichi Kasazumi, Yoshihiro Kanda, Hideki Hayashi, Seiji Nishino, and Sadao Mizuno

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Abstract

It is preferable to use thin (0.6mm) substrate to read a high density optical disk with a large numerical aperture (NA) lens1), because of allowance to disk tilt. Spherical aberration which is caused by disk thickness differences must be corrected to read conventional (1.2mm) disks. We propose a dual focus optical head with a holographic optical element (HOE) which corrects the aberration to read both 0.6mm and 1.2mm disks. It was confirmed that 0.6mm and 1.2mm disks can be read by the dual focus optical head.

© 1994 Optical Society of America

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