Optical head apparatus including two light sources and one...

Details Optical head apparatus including two light sources and one... Optical head apparatus including two light sources and one...

2005-12-27

2005-12-27

Korzuch, William (Department: 2653)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230, C369S112280, C369S112160

Reexamination Certificate

active

06980505

ABSTRACT:
In an optical head apparatus including a first light source for emitting a first light beam having a first wavelength, a second light source for emitting a second light beam having a second wavelength different from the first wavelength, an objective lens, a photodetector, and first and second optical combining/splitting elements, the first optical combining/splitting element receives the first light beam from the first light source to outgo most of the first light beam therefrom to the second optical combining/splitting element and receives the first and second light beams from the second optical combining/splitting element to outgo most of the first and second light beams therefrom to the photodetector. The second optical combining/splitting element receives the first light beam from the first optical combining/splitting element and the second light beam from the second light source to outgo most of the first and second light beams therefrom to the objective lens and receives the first and second light beams from the objective lens to outgo most of the first and second light beams therefrom to the first optical combining/splitting element.

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