Optical element having a plurality of ring-shaped zones

Details Optical element having a plurality of ring-shaped zones Optical element having a plurality of ring-shaped zones

2007-03-13

2007-03-13

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230, C359S719000

Reexamination Certificate

active

10321566

ABSTRACT:
An optical element-for use in an optical pickup apparatus for converging a light flux onto an information recording plane of an optical information recording medium, is provided with an optical path difference providing section divided coaxially around an optical axis so as to form a plurality of ring-shaped zones; and a refracting section optimizing a spherical aberration of a converged light spot of a light flux which has the operating reference wavelength λ0and is converged onto the information recording plane. The optical element converges an incident light flux having the operating reference wavelength λ0onto the information recording plane with almost no aberration, and the following formula is satisfied: |ΔfB(λ−λ0)|<2000

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European Search Report mailed May 23, 2005.

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