Near field optical head and information recording and reproducing device
US8351306B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2008 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | Aug 24, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A near field optical head includes a slider 20, a main magnetic pole 32 and an auxiliary magnetic pole 30 and is provided with a recording element 21 fixed on a top end surface of the slider. The near field optical head is provided with a light flux transmission element 22. The light flux transmission element 22 is fixed adjacently to the main magnetic pole and formed from a flat surface 40a and a curved surface 40b into the shape of a half column. The light flux transmission element 22 includes a core 40 for transmitting a light flux L introduced from one end to the other end and a cladding 41 for confining therein the core. The near field optical head includes a metal film 23, which is formed on a curved surface in the vicinity of the other end of the core for generating near filed light R from a light flux to localize the near field light on a field surface between the metal film and the curved surface, and a light flux introducing means 4 for introducing the light flux having a polarization direction adjusted into a straight direction substantially perpendicular to the flat surface from one end into the core. A top end of the main magnetic pole 32 is bent toward the core and em…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.