Magneto-optical pickup
US6542447B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Aug 2, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10543
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical pickup includes a light source for emitting a light beam, the light beam traveling to an information recording medium along a first optical path, a first light receiving element group for detecting an error signal, a second light receiving element group for detecting a magneto-optical signal, the first and second light receiving element groups being situated substantially on one plane, a diffraction grating for diffracting light returned along the first optical path from the information storage medium, the diffracted light being directed toward the first light receiving element group, a polarization beam splitter for separating a part of the return light from the information storage medium, a beam of the separated part of return light traveling to the second light receiving element group along a second optical path, a mirror for bending the second optical path, the light beam reflected thereby being directed toward the second light receiving element group, and an anisotropic optical crystal member having an optic axis inclined to the optical axis at an angle within the range between 30° and 60°, the crystal member including a parallel flat plate portion, w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.