Objective, optical pickup apparatus and optical information...

Details Objective, optical pickup apparatus and optical information... Objective, optical pickup apparatus and optical information...

2007-02-13

2007-02-13

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Microscope objective

C359S558000, C369S112070, C369S044230, C369S094000

Reexamination Certificate

active

11347303

ABSTRACT:
An objective is used in an optical pickup apparatus which conducts reproducing and/or recording information for three different types of optical information recording media each having different thickness protective substrate by using three different wavelength light fluxes respectively. The objective comprises a first diffractive structure and in which the diffraction order for the maximum diffraction efficiency is the same for all of light fluxes, and a second diffractive structure that diffracts the second light flux without diffracting the first and third light fluxes.

REFERENCES:
patent: 6870805 (2005-03-01), Arai et al.
patent: 2004-265573 (2004-09-01), None

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