Discs, image forming methods and optical disc apparatuses for forming a multi-color image in a color forming layer on an optical disk
US7558169B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 2003 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Jul 15, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/40
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Blue color forming sub-layer (205), green color forming sub-layer (206) and red color forming sub-layer (207) which start to form colors upon application of different amounts of energy are superposed on the image surface of optical disc (D). The color forming sub-layer which requires the smallest amount of energy to form color is first illuminated with laser of the power required to realize color formation from that sub-layer; subsequently, this sub-layer is illuminated with ultraviolet radiation to fix the color it has formed. Then, the next color forming sub-layer is illuminated with laser of the required power and after fixing the color it has formed, the last color forming sub-layer is illuminated with the required laser to form color.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.