Multiple recording layer focusing of a light spot with an additi

Details Multiple recording layer focusing of a light spot with an additi Multiple recording layer focusing of a light spot with an additi

1996-04-05

1997-11-25

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4414, G11B 709

Patent

active

056919719

ABSTRACT:
An optical pickup apparatus for an optical disk having multiple recording layers. Said apparatus includes a fixed optical system for emitting light toward the optical disk and receiving light reflected from the optical disk, a spot forming device for focusing light emitted from the fixed optical system to form a beam spot on the optical disk, and a spot zooming device for zooming the beam spot formed by the spot forming means onto a desired recording layer selected from the multiple recording layers of the optical disk.

REFERENCES:
patent: 4376303 (1983-03-01), Lurie
patent: 4783152 (1988-11-01), Nishimoto
patent: 5251198 (1993-10-01), Strickler
patent: 5414451 (1995-05-01), Sugiyama et al.
patent: 5499231 (1996-03-01), Fennema et al.
patent: 5526336 (1996-06-01), Park et al.

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