Thermally-assisted magnetic recording head having dummy waveguides for light beam alignment
US8358565B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 2010 |
| Grant date | Jan 22, 2013 |
| Priority date | — |
| Expiry date | Jul 23, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2005/0021
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A thermally assisted magnetic recording head includes a magnetic recording element part for writing, a main waveguide for assistance for receiving light, and a dummy waveguide component part provided in parallel to the main waveguide. The dummy waveguide component part includes a pair of waveguides having the same shape and dimensions including a first waveguide and a second waveguide that receive light from a back end surface opposite to an air bearing surface and guides the light toward the air bearing surface, and light emitting ends of the first waveguide and the second waveguide facing towards the air bearing surface have no shielding material, and are in a free condition so that the light intensity from the light emitting ends can be measured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.