Optical information recording /reproducing device and...

Details Optical information recording /reproducing device and... Optical information recording /reproducing device and...

2007-06-20

2010-11-30

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112080

Reexamination Certificate

active

07843792

ABSTRACT:
There is provided an objective lens including a first optical member and a second optical member which are made of materials different from each other and are cemented together at a cementing surface. The cementing surface includes a first phase shift structure having a plurality of refractive surface zones concentrically formed about an optical axis of the objective lens. The first phase shift structure satisfies conditions (1) and (2):in-line-formulae description="In-line Formulae" end="lead"?0.85<Φ2/Φ1<1.15  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.10<|(Φ3−Φ2)/Φ1|<0.50  (2)in-line-formulae description="In-line Formulae" end="tail"?where Φ1=m(λ1)×(λ1/(n2(λ1)−n1(λ1))), Φ2=m(λ2)×(λ2/(n2(λ2)−n1(λ2))), Φ3=m(λ3)×(λ3/(n2(λ3)−n1(λ3))), m(λ1), m(λ2), and m(λ3) are diffraction orders at which diffraction efficiencies of the first through third light beams are maximized, respectively, n1 (λ1), n1 (λ2), and n1 (λ3) are refractive indexes of the first optical member, respectively, and n2 (λ1), n2 (λ2), and n2 (λ3) are refractive indexes of the second optical member, respectively.

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English language Abstract of JP 2004-247025.
U.S. Appl. No. 11/762,096 to Koizumi et al., filed Jun. 13, 2007.

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