Optical pickup apparatus for different discs

Details Optical pickup apparatus for different discs Optical pickup apparatus for different discs

1996-12-30

1998-05-05

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369110, G11B 700

Patent

active

057486034

ABSTRACT:
An improved optical pickup apparatus for different discs which is capable of writing and reading a data onto discs having different writing densities and thicknesses by using one optical pickup apparatus and a liquid crystal deflector (LCD) or a Grating Polarizing Beam Splitter (GPBS). The apparatus includes an objective lens for focusing a beam onto optical discs each having different thicknesses, and a numerical aperture control means for selectively passing through a beam in accordance with the thickness of the optical discs, diffracting a portion of the beam, and controlling the numerical aperture of the objective lens.

REFERENCES:
patent: 4527863 (1985-07-01), Glasper et al.
patent: 5210627 (1993-05-01), Toide et al.
patent: 5416757 (1995-05-01), Luecke et al.
patent: 5513158 (1996-04-01), Ohsato
patent: 5539718 (1996-07-01), Hoshi et al.
patent: 5594713 (1997-01-01), Komma et al.

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