Detection of phase and amplitude modulation information on optical medium with a waveguide
US5444689A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1993 |
| Grant date | Aug 22, 1995 |
| Priority date | — |
| Expiry date | Aug 23, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/124
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium includes a substrate, first information for modulating a phase of read light radiated on the substrate, and second information for modulating an amplitude of the read light radiated on the substrate. The first information and the second information are arranged in parallel to each other on the substrate in a predetermined arrangement direction. A method and apparatus for performing reproduction using this medium are also disclosed. The method includes the step of radiating read light on the optical recording medium in which the first information for modulating the phase of the read light and the second information for modulating the amplitude of the read light are recorded, the step of receiving light through the optical recording medium, the detection step of independently detecting phase modulation information and amplitude modulation information of the optical recording medium using the received light, and the step of reproducing the first information and the second information from the information in the detection step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.