Method and system for controlling the eccentricity of bonded multiple optical discs
US7740729B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 1, 2007 |
| Grant date | Jun 22, 2010 |
| Priority date | — |
| Expiry date | Feb 7, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/24038
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques for bonding two disks with a minimized eccentricity (ECC) are disclosed. A positioning header includes an ECC controlling structure that further includes a positioning header. In one embodiment, the position header includes three members that form a round stand with a diameter smaller than the inner diameter of the disks. The round stand expands to the inner diameter of the disks to close the gap as a result of the difference between the two diameters when the three members are caused to expand. In one embodiment, the movement of the three members is controlled by magnetic means. Depending on the positions of the ECC controlling structure, the three members are expanded from or restored to their default positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.