Spherical aberration compensation by wavelength
US7209414B2 · kind B2 · utility
0Cited by
17References
4Claims
0Family size
Assignee
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Key dates
| Filing date | May 27, 2003 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Feb 23, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1392
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for minimizing spherical aberration in an optical read/write drive caused by variances in lens thickness and laser wavelength. The method provides an economic solution that pairs objective lenses with laser diodes such that the spherical aberration caused by the objective lens is offset by the spherical aberration caused by the laser wavelength, thereby minimizing or completely canceling the overall spherical aberration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.