Optical pickup lens device and information recording and...

Details Optical pickup lens device and information recording and... Optical pickup lens device and information recording and...

2007-05-22

2007-05-22

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C369S112030

Reexamination Certificate

active

11385829

ABSTRACT:
An optical pickup lens device includes, in the order from the light source side, a collimating lens for converting a bundle of rays into parallel rays or predetermined convergent or divergent rays, the collimating lens being movably held along a direction of an optical axis of a bundle of rays emitted from a light source; an aberration correcting element for allowing a bundle of rays emitted from the collimating lens to be transmitted therethrough; and an objective lens element having a numerical aperture of 0.8 or more, and converging a bundle of rays coming from the aberration correcting element onto the information recording medium to form a spot. The aberration correcting element and the objective lens element are integrally held together in a direction orthogonal to the optical axis so as to perform tracking on the information recording medium, and satisfy predetermined conditions.

REFERENCES:
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patent: 64-019316 (1989-01-01), None
patent: 7-294707 (1995-11-01), None
patent: 11-337818 (1999-12-01), None
patent: 2001-067701 (2001-03-01), None
patent: 2003-059080 (2003-02-01), None
patent: 2003-084196 (2003-03-01), None
patent: 2004-071134 (2004-03-01), None

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