Objective lens and optical information read/write device

Details Objective lens and optical information read/write device Objective lens and optical information read/write device

2006-05-23

2010-06-22

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112010, C369S112030, C369S112080, C369S112230, C359S719000

Reexamination Certificate

active

07742370

ABSTRACT:
An objective lens, for an optical information read/write device that performs read/write operations on each of a plurality of optical discs using a corresponding one of three laser beams having first, second, and third wavelengths λ1, λ2, and λ3 (nm) satisfying a relationship λ1<λ2<λ3, respectively, includes a phase shift structure having a plurality of ring-shaped refractive surface zones into which at least one surface of the objective lens is concentrically divided. The objective lens is made of material with an Abbe number νd satisfying a condition 40≦νd≦80. The phase shift structure has a step between each couple of the adjacent refractive surface zones that gives an optical path difference to an incident laser beam, so that a condition 2N+1.00<|ΔOPD/λ1|<2N+1.30 is satisfied, where ΔOPD represents the optical path difference (nm) that the step gives to the laser beam with the first wavelength, and N represents a non-negative integer.

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