High NA objective lens for optical pick-up

Details High NA objective lens for optical pick-up High NA objective lens for optical pick-up

2006-05-30

2006-05-30

Nguyen, Hoa T. (Department: 2656)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230

Reexamination Certificate

active

07054254

ABSTRACT:
A single-element objective lens is employed in an optical pick-up. The objective lens directs an incident light beam to a data recording surface of an optical disc through a cover layer to form a beam spot thereon. A numerical aperture of the objective lens is 0.7 or more. The objective lens is configured such that a characteristic of aberration which is generated due to decentering of surfaces of the objective lens is substantially comparable to a characteristic of aberration due to an inclination of an optical axis of the objective lens and an inclination of a central axis of the light beam incident on the data recording surface of the optical disc with respect to the optical disc.

REFERENCES:
patent: 15939 (1856-10-01), Kubo
patent: 5754513 (1998-05-01), Yagi et al.
patent: 6058095 (2000-05-01), Yamamoto et al.
patent: 6118594 (2000-09-01), Maruyama
patent: 6411442 (2002-06-01), Ota et al.
patent: 2001/0015939 (2001-08-01), Kubo
patent: 11190818 (1999-07-01), None
English Language Translation for JP Appln. No. 11-190818.

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