Optical pick-up apparatus

Details Optical pick-up apparatus Optical pick-up apparatus

2007-09-11

2007-09-11

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112030

Reexamination Certificate

active

10913460

ABSTRACT:
An optical pick-up apparatus comprising: first, second and third light sources for recording and/or reproducing respectively first, second and third optical information recording material; an objective optical element having a diffractive structure on an optical surface of the objective lens, wherein a diffraction efficiency E1of a first primary diffractive ray is not less than 90%, a diffraction order n1of the first primary diffractive ray is an odd number, and an output power PW3, which is an output power of the third light source when the third light source emits the third light flux, is emitted is greater than an output power PW1, which is an output power of the first light source when the first light source emits the first light flux.

REFERENCES:
patent: 6870805 (2005-03-01), Arai et al.

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