Objective lens, coupling lens, light converging optical...

Details Objective lens, coupling lens, light converging optical... Objective lens, coupling lens, light converging optical...

2005-04-05

2005-04-05

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S721000, C359S733000, C369S112080, C369S112240

Reexamination Certificate

active

06876501

ABSTRACT:
An objective lens for recording and/or reproducing an optical information recording medium, comprises a first lens having a positive refractive power; and a second lens having a positive refractive power; wherein the first lens and the second lens are aligned in this order from a light source side of the objective lens; first lens and the second lens are respectfully made of material having a specific gravity of 2.0 of less and the objective lens satisfies the following conditional formula:in-line-formulae description="In-line Formulae" end="lead"?NA≧0.70,in-line-formulae description="In-line Formulae" end="tail"?where NA: a predetermined image side numerical aperture necessary for recording and/or reproducing of the optical information recording medium.

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