Optical pickup for optical disk having multiple recording layers

Details Optical pickup for optical disk having multiple recording layers Optical pickup for optical disk having multiple recording layers

1995-06-02

1996-06-11

Psitos, Aristotelis

Dynamic information storage or retrieval

Systems having plural physically distinct independent tracks...

Having layered storage medium

369 44230, 369 44370, 369110, 369112, G11B 709

Patent

active

055263364

ABSTRACT:
An optical pickup for all optical disk having multiple recording layers is provided to exactly control a focal position according to the thickness of optical disk, by separately controlling focal positions on each recording layer, wherein a Fresnel lens for diffracting an optical beam generated from an optical source and an objective lens for focusing the diffracted beam are separately located, and focus driving coils are included for separately driving the Fresnel lens and objective lens by using a signal detected by an optical detector. As the interval between the Fresnel lens and objective lens is varied, the interval between focal points formed on each recording layer is also varied. Thus, the focal positions formed on each recording layer can be exactly controlled according to the thickness of optical disk. Therefore, information can be clearly reproduced without interference by simultaneously scanning each recording layer while exactly controlling the focal positions.

REFERENCES:
patent: 4908813 (1990-03-01), Ojima et al.
patent: 5097464 (1992-03-01), Nishiuchi et al.
patent: 5408453 (1995-04-01), Hottslag et al.
patent: 5446565 (1995-08-01), Komma et al.

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