Title:
METHOD FOR DETERMINING SPHERICAL ABERRATION
Document Type and Number:
WIPO Patent Application WO2005069280
Kind Code:
A3
Abstract:
The present invention relates to a method and a device for determining spherical aberration occurring during reading from and/or writing to optical recording media. According to the invention, a method for determining spherical aberration includes the steps of: splitting the light beam (2) into at least two partial light beams (20, 21, 22, 23, 24, 25); focusing the partial light beams (20, 21, 22, 23, 24, 25) onto respective detectors (11, 12, 13, 16, 17, 18), whereby at least one signal (A, B, C, D) generated by the detectors (12, 13, 16, 17, 18) depends on the positions of the respective partial light beam (21, 22, 23, 24, 25); and determining the spherical aberration using the signals (A, B, C, D) generated by the detectors (12, 13, 16, 17, 18).
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Inventors:
KNITTEL JOACHIM (DE)
Application Number:
PCT/EP2004/012593
Publication Date:
November 03, 2005
Filing Date:
November 06, 2004
Export Citation:
Assignee:
THOMSON LICENSING SA (FR)
KNITTEL JOACHIM (DE)
KNITTEL JOACHIM (DE)
International Classes:
G02B7/00; G02B27/00; G02B27/40; G11B7/135; G11B7/13; (IPC1-7): G11B7/135; G02B7/00
Foreign References:
| US20020176332A1 | 2002-11-28 | |||
| EP1209669A2 | 2002-05-29 | |||
| US20020057359A1 | 2002-05-16 | |||
| US20030053393A1 | 2003-03-20 | |||
| US6353582B1 | 2002-03-05 | |||
| US20030075669A1 | 2003-04-24 |
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