Patent ID: 6714506
Filing Date: 2004-03-30
Classification: G11B

Abstract:
An optical head for focusing laser light on an optical information medium and receiving the reflected light from the optical information medium comprising:a first laser emitting component; and a second laser emitting component, the second laser emitting component including: a first light receiving element; a second light receiving element; and a third light receiving element, wherein the first laser emitting component is configured to selectively produce laser light of a first wavelength and a second wavelength and the second laser emitting component is configured to produce laser light only of a third wavelength, wherein the first light receiving element is arranged to receive reflected laser light of the first wavelength, wherein the second light receiving element is arranged to receive reflected laser light of the second wavelength, wherein the third light receiving element is arranged to receive reflected laser light of the third wavelength, wherein the first laser emitting component comprises only a first single laser chip and the second laser emitting component comprises only a second single laser chip, the first single laser chip operable to selectively produce laser light of the first wavelength and laser light of the second wavelength.