Diffraction element, objective lens unit, optical pickup,...

Details Diffraction element, objective lens unit, optical pickup,... Diffraction element, objective lens unit, optical pickup,...

2007-03-07

2008-12-09

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S571000, C369S112040, C369S112050

Reexamination Certificate

active

07463430

ABSTRACT:
The first and second materials of the diffraction element are selected such that the first material's refraction indexes n1(λ1), n1(λ2) and n1(λ3) for the first, second and third wavelengths λ1, λ2and λ3and the second material's refraction indexes n2(λ1), n2(λ2) and n2(λ3) for the first, second and third wavelengths λ1, λ2and λ3satisfy one of the conditions (1) or (2).

REFERENCES:
patent: 7227704 (2007-06-01), Koike
patent: 7260047 (2007-08-01), Nishioka et al.
patent: 2005-302270 (2005-10-01), None
U.S. Appl. No. 11/350,057, filed Feb. 9, 2006, Yoshito Asoma.

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