Optical disk
US6620479B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 14, 2001 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Feb 16, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24314
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disk includes a disk substrate made of synthetic resins and an elastic/non-elastic film for label printing. The disk substrate has a chucking central aperture, and the peripheral portion of the chucking central portion constitutes a clamping area. The film is fixed on an upper surface of the disk substrate so as to cover the chucking central aperture. In case of the elastic film, at least a portion of the film corresponding to the chucking central aperture expands/contracts in accordance with the movement of a disk chuck into/out of the chucking central aperture. On the other hand, in case of the non-elastic film, cuts are made in a portion corresponding to the chucking central aperture, whereby the cut portion of the film opens/closes in accordance with the movement of a disk chuck into/out of the chucking central aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.