Objective lens for optical pickup apparatus, optical pickup...

Details Objective lens for optical pickup apparatus, optical pickup... Objective lens for optical pickup apparatus, optical pickup...

2004-02-05

2008-08-05

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112260

Reexamination Certificate

active

07408866

ABSTRACT:
An objective lens, comprises a first diffractive structure having plural concentric ring-shaped zones. A n1-th order diffracted ray is converged on an information recording surface of first optical information recording medium through first protective substrate in such a way that when a wavefront aberration is measured within a first numerical aperture NA1, the RMS value of the wavefront aberration becomes 0.07λ1or less, and a n2-th order diffracted ray (n2<n1) is converged on a information recording surface of second optical information recording medium through second protective substrate in such a way that when a wavefront aberration is measured within a second numerical aperture NA2 (NA2<NA1), the RMS value of the wavefront aberration becomes 0.07λ2or less.

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