Optical pickup information reproducing apparatus and information recording apparatus
US6373807B1 · kind B1 · utility
6Cited by
4References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1999 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Sep 8, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13922
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup includes a light source for emitting more than two light beams whose wavelengths are different from each other, and an objective lens including a first lens and a second lens. The first lens is a lens for collecting each light beam onto a recording medium. The second lens is a lens for compensating chromatic aberration in the light beams. The second lens is placed on the first lens in contact and is located across the optical path of each light beam. The absolute value of the difference between the Abbe number of the first lens and the Abbe number of the second lens is greater than 10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.