Optical head device and optical information apparatus using...

Details Optical head device and optical information apparatus using... Optical head device and optical information apparatus using...

2007-11-16

2010-10-12

Chow, Van N (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112040

Reexamination Certificate

active

07813251

ABSTRACT:
Providing an objective lens with a large numerical aperture (NA), the present invention records or plays conventional optical disks such as CDs and DVDs at high light usage efficiency, using an optical head capable of recording or reproducing high-density optical disks. A diffraction optical element (8) is disposed in a light path of a first light beam of a first wavelength λ1(400 nm to 415 nm) and a second light beam of a second wavelength λ2(650 nm to 680 nm). And, the present invention principally emits 5th order diffracted light with respect to the first light beam, and principally emits 3rd order diffracted light with respect to the second light beam, from the diffraction optical element (8). Thus, a high diffraction efficiency of substantially 100% can be obtained with respect to both wavelengths.

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