Method and apparatus for holographic data storage system
US5920536A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1998 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Jun 22, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C13/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Feedback is employed in a holographic memory system to facilitate rapid access to information in a stored data page. This feedback technique provides compensation for thermal, optical and/or mechanical variations in the system components that tend to interrupt the projection of a data page image on a sensor array. A page indicator or mark is stored in a holographic storage medium with a page of data such that, during playback, a quality, e.g., intensity, of its projected image is indicative of the quality of the corresponding projected data page image. A corresponding page indicator sensor is employed with the associated sensor array to detect the quality of a projected page indicator image. The projected data page image can then be read by sensor elements of the detector based on the detected quality of the page indicator image. Such a detector can be implemented in an active pixel sensor (APS) array with the page indicator sensor being implemented as a region of the APS array. Registration of the sensor array elements with respect to projected data pixels of the data page image can also be aligned to an absolute or substantially nearest pixel alignment by a similar feedback techn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.