Optical recording method and optical recording apparatus
US6317404A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1999 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Aug 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H1/0465
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Binary two-dimensional digital data can be recorded in an optical recording medium as holograms in such a way that a recording area is made sufficiently minute correspondingly to the two-dimensional digital data by adequately limiting the spread of signal light and reference light without causing loss of the data and a read error during reconstructing. Signal light of a binary two-dimensional digital data image is subjected to Fourier transform by a lens. There is disposed forwardly of an optical recording medium a shading material having a circular, semicircular, sectorial, or L-shape light transmission part 21 that allows transmission of only components of 0th to n-th (n=1, 2, or 3) orders. The signal light after Fourier transform and reference light are transmitted through the light transmission part 21 for irradiation to the optical recording medium and a Fourier transform hologram is recorded in the optical recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.