Optical information recording medium
US6379768B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2000 |
| Grant date | Apr 30, 2002 |
| Priority date | — |
| Expiry date | Oct 14, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording medium composed of a substrate and a recording layer having a dye compound of the formula (I):R1R2C═L1—L2═L3—NR3R4  (I)in which each of R1 and R2 is an electron-attracting group (i.e., electron-withdrawing group) having a Hammett's substituent constant &sgr;p in the range of 0.2 to 0.9; each of L1, L2, and L3 is a methine group which can have a substituent under such condition that two or three of L1, L2, and L3 can form a ring structure together with the substituent; and each of R3 and R4 is a hydrogen atom, an alkyl group, an aryl group, an aralkyl group, or a heterocyclic group, provided that each set of R1 and R2, R2 and a substituent of L1, R2 and a substituent of L2, R2 and a substituent of L3, a substituent of L1 and R3, a substituent of L2 and R3, a substituent of L3 and R3, and R3 and R4 can be connected to each other to form a ring structure, is advantageously employed for recording information utilizing a laser beam having a wavelength of 550 nm or shorter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.