Objective lens and optical pickup device

Details Objective lens and optical pickup device Objective lens and optical pickup device

2006-10-10

2006-10-10

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010, C369S112030, C369S112080

Reexamination Certificate

active

07120108

ABSTRACT:
An objective lens to converge a light flux having a working reference wavelength λ0(380 nm≦λ0≦450 nm) under a working reference temperature T0onto an optical information recording medium equipped with a protective substrate having a thickness of 0.6 mm with almost no aberration. The diffractive structural section of the objective lens has a first compensating function to compensate a change amount δSA1of the third-order spherical aberration component of wavefront aberration caused by a fluctuation of a working wavelength, a second compensating function to compensate a deviation δWD of a converged-light spot in an optical axis direction caused by a fluctuation of a working wavelength, and a third compensating function to compensate a change amount δSA2of the third-order spherical aberration component of wavefront aberration caused by a change of a refractive index of the lens body.

REFERENCES:
patent: 6349000 (2002-02-01), Yamagata et al.

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