Optical head apparatus

Details Optical head apparatus Optical head apparatus

1994-12-15

1997-03-25

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369103, 369100, 372 32, 372103, G11B 700

Patent

active

056151993

ABSTRACT:
An optical head apparatus for recording and reproducing data to and from optical disks, the apparatus boosting recording density by use of an objective lens with a higher numerical aperture (NA) than ever. A phase plate is added to the pupil position of the objective lens or to a position close thereto. The phase plate arrangement provides a deeper focal length, reduces the adverse effects of aberration and eliminates the need for a tilt servo mechanism despite the use of the objective lens having a greater numerical aperture than before.

REFERENCES:
patent: 5025438 (1991-06-01), Emoto
patent: 5349592 (1994-09-01), Ando 372 32

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