Dual focus objective lens with two curvatures for focussing ligh

Details Dual focus objective lens with two curvatures for focussing ligh Dual focus objective lens with two curvatures for focussing ligh

1995-12-26

1997-12-30

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 94, G11B 700

Patent

active

057038627

ABSTRACT:
A dual-focus objective lens for an optical pickup which is compatible with both 0.6 mm and 1.2 mm disks is compensated in its aberration with respect to a light spot on a recording plane of the loaded disk and at least one of a light-receiving plane and a light-emitting plane of the dual focus objective lens has a first curvature unit and a second curvature unit whose curvature radii are different from each other. Incident light beams passing through the whole region of the first curvature unit and second curvature unit are focused onto the thinner disk, and parts of incident light beams passing through the region around the first curvature unit are focused onto the thicker disk. In the optical pickup having the dual focus objective lens, since the light is not divided, light efficiency is improved, thereby reproducing a signal with a high signal-to-noise ratio. Particularly, an optical pickup enabling recording as well as reproduction is obtained.

REFERENCES:
patent: 4566762 (1986-01-01), Kato
Y. Komma et al., "Dual focus optical head for 0.6mm and 1.2mm disks," Optical Data Storage, SPIE vol. 2338, 1994, pp. 282-288.

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