Objective lens, optical pickup device and method for...

Details Objective lens, optical pickup device and method for... Objective lens, optical pickup device and method for...

2006-10-24

2006-10-24

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

Reexamination Certificate

active

07126902

ABSTRACT:
An objective lens for use in an optical pickup apparatus has a diffractive optical surface. A first light flux having a first wavelength of λ1is converged as a first number diffraction order diffracted-ray other than the zero-th order diffracted-ray onto an information recording plane of the first optical information recording medium having a thinner protective substrate t1by the diffractive optical surface and a second light flux having a second wavelength of λ2(λ1<λ2) is converged as a second number diffraction order diffracted-ray other than the zero-th order diffracted-ray onto the information recording plane of the second optical information recording medium having a thicker protective substrate t2(t1<t2) by the diffractive optical surface. The second number diffraction order is different from the first number diffraction order.

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