Process for holographic recording of data in the form of electrical signals
US4175823A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 1976 |
| Grant date | Nov 27, 1979 |
| Priority date | — |
| Expiry date | Jun 29, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0065
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A process of recording information which is in the form of electrical signals by pulse amplitude modulating an object wave and directing it with a reference wave onto a moving light-sensitive storage medium to record hybrid holograms thereon characterized in that the object beam is split into a plurality of parallel object beams each of which is individually and separately pulse modulated with a separate signal to be recorded, focusing the parallel modulated beams into an astigmatic object wave and focusing the reference wave into an astigmatic reference wave, with each wave having a focal line extending parallel to the direction of feed being coplanar and each wave having a focal line which is extending perpendicular to the direction of feed being mirror symmetrical to the storage medium. Preferably, the rate of advance or feed of the storage medium is controlled so that the individual holograms are overlapping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.