Objective lens, optical element, optical pick-up apparatus...

Details Objective lens, optical element, optical pick-up apparatus... Objective lens, optical element, optical pick-up apparatus...

2011-01-18

2011-01-18

Huber, Paul (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112260, C369S121000

Reexamination Certificate

active

07872959

ABSTRACT:
A hybrid objective lens has a refractive lens and a diffractive optical element constructed by plural coaxial ring-shaped zones on at least one optical surface thereof. When n1, n2 and n3 each is a diffraction order of a diffracted ray having a maximum light amount among diffracted rays of each of first, second and third light flux having wavelength λ1, λ2 and λ3 when respective light flux comes to be incident into the diffractive structure respectively, the following formulas are satisfied:in-line-formulae description="In-line Formulae" end="lead"?|n1|>|n2|, and |n1|>|n3|, andin-line-formulae description="In-line Formulae" end="tail"?the hybrid objective lens converges a n1-th, n2-th and n3-th order diffracted ray of the first, second and third light flux onto an information recording plane of each of the first, second ant third optical information recording medium respectively so as to form an appropriate wavefront within respective prescribed necessary image side numerical apertures.

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European Search Report dated May 16, 2008, issued in counterpart European Application No. 02257091.5-1232.

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