Multiple pixel reading of holographic data including a position error calculation
US6414296B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2000 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Jan 10, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C13/042
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The invention includes a method of generating a position error signal in a holographically imaged data recording system. This method comprises using an optical imaging system to image a plurality of holographically recorded pixels onto a plurality of camera pixels forming a data page. Each holographically recorded pixel is imaged onto an array of at least two adjacent camera pixels in any direction. The output signals from the arrays of camera pixels are used to calculate a position error signal. In a preferred embodiment, the holographically recorded pixel is imaged onto an array of four adjacent camera pixels that form a square having two pixels in each direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.