Objective lens and optical pickup device

Details Objective lens and optical pickup device Objective lens and optical pickup device

2008-05-28

2010-10-19

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07817525

ABSTRACT:
In order that thickness reduction, weight reduction, and mass productivity improvement should be achieved in an objective lens even in the case where NA is high, an objective lens according to the present invention is a bi-convex single lens having at least one aspheric surface, and satisfies conditions: (1) 3.5<DH-S/DH-H′<4.3; (2) 3.5<DH′-T2/DT1-H<50; (3) 0.9<d/f<1.1 (NA≧0.85). Here, DH-Sis a distance on the optical axis from a front principal point H to a focal point S on an optical information recording medium side; DH-H′is a distance on the optical axis from the front principal point H to a rear principal point H′; DH′-T2is a distance on the optical axis from the rear principal point H′ to an intersecting point T2of the optical axis and an optical information recording medium side surface of the objective lens; DT1-His a distance on the optical axis from an intersecting point T1of the optical axis and a light source side surface of the objective lens to the front principal point H; d is a thickness on the optical axis; and f is a focal length.

REFERENCES:
patent: 5553052 (1996-09-01), Oono et al.
patent: 6529465 (2003-03-01), Kase et al.
patent: 7187641 (2007-03-01), Sakamoto
patent: 2004/0047049 (2004-03-01), Ota et al.
patent: 2004/0156304 (2004-08-01), Sakamoto
patent: 2003-091854 (2003-03-01), None

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