Optical pick-up apparatus for multiple data surface optical disk system
US5966364A · kind A · utility
14Cited by
1References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1997 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Oct 27, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pick-up device includes a laser source which emits multi-mode laser beam consist of varied wavelength in wide spectrum, and an optical filter which eliminates improper ranges of the laser's spectrum and transmits only preferred wavelength domains. Therefore, a diffraction device composed of at least two diffractive elements can produce several focal points dependent upon selected wavelength by the optical filter and diffractive index of the each diffractive element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.