Dual focus optical head for 0.6-mm and 1.2-mm disks

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

doi:10.1117/12.190195

12 October 1994 Dual focus optical head for 0.6-mm and 1.2-mm disks

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

Proceedings Volume 2338, 1994 Topical Meeting on Optical Data Storage; (1994) https://doi.org/10.1117/12.190195
Event: Optical Data Storage '94, 1994, Dana Point, CA, United States

Abstract

We propose a dual focus optical head with a holographic optical element (HOE) which compensates for spherical aberration, allowing it to read both 0.6 mm disks and 1.2 mm disks. The thin disk is read using transmitted light and the thick disk is read using +1st order diffracted light of the blazed HOE. The characteristics of the focused spot, the servo signal detection and the signal of the Compact Disc indicate that both disks can be read by the dual focus optical head.

Citation Download Citation

Yoshiaki Komma, Kenichi Kasazumi, Seiji Nishino, Sadao Mizuno, Yoshihiro Kanda, and Hideki Hayashi "Dual focus optical head for 0.6-mm and 1.2-mm disks", Proc. SPIE 2338, 1994 Topical Meeting on Optical Data Storage, (12 October 1994); https://doi.org/10.1117/12.190195

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