Optical system for simultaneous reading of multiple data tracks

Details Optical system for simultaneous reading of multiple data tracks Optical system for simultaneous reading of multiple data tracks

1990-09-24

1992-01-14

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, G11B 700

Patent

active

050816179

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.

REFERENCES:
patent: 3780266 (1973-12-01), Mudsam et al.
patent: 4283777 (1981-08-01), Curry et al.
patent: 4944037 (1990-07-01), Ando

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