Objective lens for optical information recording medium

Details Objective lens for optical information recording medium Objective lens for optical information recording medium

2006-10-17

2006-10-17

Spector, David N. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S718000, C369S112230

Reexamination Certificate

active

07123424

ABSTRACT:
An objective lens capable of recording or reproducing informations of HD, DVD and CD is provided. A reference lens2aand a close-contact lens2bare closely in contact and bonded, the material of the close-contact lens2bis different from the material of the reference lens2a, a lens surface of the reference lens and a lens surface of the close-contact lens have aspherical shapes, the reference lens has a light-converging function, and the close-contact lens has a region providing a positive refractive power and a region providing a negative refractive power to construct an objective lens for optical information recording media.

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