Collimator optical system and optical information storage device
US7002758B2 · kind B2 · utility
12Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2005 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Apr 5, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13922
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention is intended, as an object thereof, to improve stability against both temperature changes and light source output changes, and includes an achromatic lens having a composite structure of glass or a plastic lens having a diffraction grating counteracting a focal length change due to a wavelength change of light, where a lens holder is adhered to an opposite side to a light source of an overhang of the achromatic lens made of glass while the lens holder is adhered to a light source side of the overhang of the plastic lens with the diffraction grating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.