Hologram erasing method and hologram erasing apparatus
US7426168B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 2004 |
| Grant date | Sep 16, 2008 |
| Priority date | — |
| Expiry date | Oct 4, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a hologram erasing method, in which a predetermined hologram is erased by irradiating a predetermined region of a hologram recording medium in which the hologram to be erased is recorded with a reference light beam and a signal light beam holding a random data pattern at the same time. In this method, the signal light beam and the reference light beam interfere with each other in the medium, and a Fourier transform hologram recorded in the region where the interference occurs is destroyed and erased by interference light beam. That is, a data page for erasing including a random pattern is overwritten to erase an original data page. According to the present invention, the hologram recorded in the optical recording medium can be selectively and completely erased in a simple method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.