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Proceedings Paper

Realization of an active-tilt-controlled high-numerical-aperture two-lens objective for optical recording
Author(s): Jan P. Baartman; Benno H. W. Hendriks; Jan W. Aarts; Gerard E. van Rosmalen
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Paper Abstract

This report describes the realization of an actuator for a high-numerical-aperture objective lens, as part of an experimental optical disk player. The player is capable of reading a disk with 10GByte density and is fully compatible with the 120 mm Digital Video Disk Read-Only Disk standard. The objective consists of two lens elements, having one aspherical surface, and a free working distance of 50 micrometers . A special active-tilt-control (ATC) actuator is required to achieve sufficient tolerance for disk cover layer thickness and tilt between objective and disk. The ATC-actuator, containing the objective, is as small as a standard CD ROM objective, and therefore fits in a standard 2D-actuator for focus and radial tracking. The manufacturing and assembly of the ATC-actuator requires specialized prototyping techniques, such as the use of alignment molds, and assembly in a specialized clean room. We have controlled the free working distance within 1.1 micrometers and tilt within 0.7 mrad at 3kHz, while being carried in a Philips actuator, operating at 2kHz. The ATC-actuator was developed to investigate new options for future optical storage systems.

Paper Details

Date Published: 27 August 1999
PDF: 8 pages
Proc. SPIE 3737, Design and Engineering of Optical Systems II, (27 August 1999); doi: 10.1117/12.360023
Show Author Affiliations
Jan P. Baartman, Philips Research Labs. (Netherlands)
Benno H. W. Hendriks, Philips Research Labs. (Netherlands)
Jan W. Aarts, Philips Research Labs. (Netherlands)
Gerard E. van Rosmalen, Philips Research Labs. (Netherlands)

Published in SPIE Proceedings Vol. 3737:
Design and Engineering of Optical Systems II
Fritz Merkle, Editor(s)

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