Floating optical pickup and information recording and reproducin

Details Floating optical pickup and information recording and reproducin Floating optical pickup and information recording and reproducin

1997-10-06

2000-12-12

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369112, G11B 1100

Patent

active

061607681

ABSTRACT:
An optical pickup (11) is provided with: a light source (2) for emitting a light beam (B); an objective lens (6) for condensing the emitted light beam onto an information record medium (1), which has an information record surface (1') for recording information thereon, from one external surface of the information record medium; and an immersion lens (7) disposed on an optical path of the condensed light beam between the objective lens and the information record medium for increasing a numerical aperture for the condensed light beam. The optical pickup is further provided with a floating device (33, 34, 40, 50, 45, 46, 47) for floating the immersion lens from the one external surface, such that a distance between a center of curvature of the immersion lens and the information record surface is within a predetermined tolerable range.

REFERENCES:
patent: 5125750 (1992-06-01), Corle et al.
patent: 5689480 (1997-11-01), Kino
patent: 5764613 (1998-06-01), Yamamoto et al.
patent: 5910940 (1999-06-01), Guerra

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