Optical pick-up apparatus for multiple data surface optical disk

Details Optical pick-up apparatus for multiple data surface optical disk Optical pick-up apparatus for multiple data surface optical disk

1997-10-27

1999-10-12

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, G11B 700

Patent

active

059663642

ABSTRACT:
An optical pick-up device includes a laser source which emits multi-mode laser beam consist of varied wavelength in wide spectrum, and an optical filter which eliminates improper ranges of the laser's spectrum and transmits only preferred wavelength domains. Therefore, a diffraction device composed of at least two diffractive elements can produce several focal points dependent upon selected wavelength by the optical filter and diffractive index of the each diffractive element.

REFERENCES:
patent: 5526338 (1996-06-01), Hasman et al.

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