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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 8 — Mar. 10, 2000
  • pp: 1309–1314

Effects of an asymmetrically molded plastic objective lens on the push–pull tracking-error signal in an optical disk drive

Kai Man Hung  »View Author Affiliations


Applied Optics, Vol. 39, Issue 8, pp. 1309-1314 (2000)
http://dx.doi.org/10.1364/AO.39.001309


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Abstract

The effects of a plastic objective lens’s astigmatism on the push–pull tracking-error signal (TES) of an optical disk data storage system were investigated theoretically and experimentally. Astigmatism of plastic objective lenses arises commonly from the asymmetric deviation from their designed shape during the molding process. By carefully studying the aberration characteristics of the objective lens and including the astigmatism of the laser diode in the analysis, we can calculate the combined effects of astigmatism of these two components on the push–pull TES. It is found, from both the simulations and the experiments, that, by rotation of the objective lens about the optical axis, the peak-to-peak value of the push–pull TES varies with the lens’s rotation angle, and a change as great as 340% in its value was observed in a given optical pickup.

© 2000 Optical Society of America

OCIS Codes
(080.3630) Geometric optics : Lenses
(210.0210) Optical data storage : Optical data storage
(220.1000) Optical design and fabrication : Aberration compensation

History
Original Manuscript: August 16, 1999
Revised Manuscript: December 21, 1999
Published: March 10, 2000

Citation
Kai Man Hung, "Effects of an asymmetrically molded plastic objective lens on the push–pull tracking-error signal in an optical disk drive," Appl. Opt. 39, 1309-1314 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-8-1309

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