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Proceedings Paper

Pneumatic sensing system used for focusing in multiwavelength optical disc mastering
Author(s): Qicheng Zhang; Kun Qian; Duanyi Xu; Guosheng Qi; Hua Hu
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Paper Abstract

In order to meet the requirement of focusing in the multi-wavelength mastering system, a pneumatic sensing system is designed. It detects the objective lens position signals and sends to the focus control system as the focus error signals instead of the feedback signals of light intensity used traditionally. So it can solve the auto-focus problem caused by introducing multi-wavelength lasers. The static and frequency response characteristics of the system are tested. It is proved by the experiment that the focus error is under ±0.1μm and can meet the needs of the three-wavelength system.

Paper Details

Date Published: 3 January 2005
PDF: 6 pages
Proc. SPIE 5643, Advances in Optical Data Storage Technology, (3 January 2005); doi: 10.1117/12.570354
Show Author Affiliations
Qicheng Zhang, Tsinghua Univ. (China)
Kun Qian, Tsinghua Univ. (China)
Duanyi Xu, Tsinghua Univ. (China)
Guosheng Qi, Tsinghua Univ. (China)
Hua Hu, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 5643:
Advances in Optical Data Storage Technology
Duanyi Xu; Kees A. Schouhamer Immink; Keiji Shono, Editor(s)

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