Optical system for simultaneous reading of multiple data tracks
US5081617A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1990 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Sep 24, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical system for reading and tracking multiple tracks of optically recorded data consists of a combination of spherical and cylindrical lenses shaping the emission of a laser diode into a narrow line on the surface of the recorded material. This line is subsequently imaged on a detector array containing multiple detectors for each data track being read. Digital signal processing identifies the tracks and follows them by selecting the proper detectors in the detector array. Track-to-track interference is minimized by selecting the numerical aperture of the final lens to have the nulls of the Airy pattern at double the track spacing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.