Realization of an active-tilt-controlled high-numerical-aperture two-lens objective for optical recording

Jan P. Baartman; Benno H. W. Hendriks; Jan W. Aarts; Gerard E. van Rosmalen

doi:10.1117/12.360023

27 August 1999 Realization of an active-tilt-controlled high-numerical-aperture two-lens objective for optical recording

Jan P. Baartman, Benno H. W. Hendriks, Jan W. Aarts, Gerard E. van Rosmalen

Author Affiliations +

Proceedings Volume 3737, Design and Engineering of Optical Systems II; (1999) https://doi.org/10.1117/12.360023
Event: Optical Systems Design and Production, 1999, Berlin, Germany

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.

Citation Download Citation

Jan P. Baartman, Benno H. W. Hendriks, Jan W. Aarts, and Gerard E. van Rosmalen "Realization of an active-tilt-controlled high-numerical-aperture two-lens objective for optical recording", Proc. SPIE 3737, Design and Engineering of Optical Systems II, (27 August 1999); https://doi.org/10.1117/12.360023

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