Optical pickup for an optical disc reproducing system

Details Optical pickup for an optical disc reproducing system Optical pickup for an optical disc reproducing system

1993-06-08

1994-04-12

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369 4412, G11B 708

Patent

active

053032217

ABSTRACT:
An optical pickup has a light source for generating a first light having a longer wavelength and a second light having a shorter wavelength, an objective, and a phase hologram disposed between the light source and the objective. The objective is designed to have a larger spherical aberration for the first light than a spherical aberration for the second light. The phase hologram is arranged to give a phase difference of an integer multiple of 2.pi. for the second light. The phase hologram is further arranged so that a spherical aberration given to the first light has an opposite polarity to the polarity of the spherical aberration given by the objective.

REFERENCES:
patent: 5208801 (1993-06-01), Finegan

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