Converging optical element and optical pickup apparatus

Details Converging optical element and optical pickup apparatus Converging optical element and optical pickup apparatus

2005-06-16

2009-11-03

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112060, C369S112070

Reexamination Certificate

active

07613096

ABSTRACT:
A converging optical element for use in an optical pickup apparatus reproducing and/or recording information on a first optical disc using a first light flux with a wavelength λ1emitted by a first light source, reproducing and/or recording information on a second optical disc using a second light flux with a wavelength λ2emitted by a second light source, and reproducing and/or recording information on a third optical disc using a third light flux with a wavelength λ3emitted by a third light source, the converting optical element includes: a phase structure arranged on at least one surface of the converging optical element, wherein when f3is a focal length of the converging optical element for the third light flux, the focal length f3satisfies a predefined condition.

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