Patent ID: 6967919

Claim:
An optical head for focusing laser light on an optical information medium and receiving reflected light from the optical information medium comprising: a first laser emitting component disposed on a first substrate and operable to produce laser light at a first wavelength; and a second laser emitting component disposed on a second substrate and operable to produce laser light at a second wavelength and to detect laser light, the second substrate separate from the first substrate, the second laser emitting component comprising: a first light receiving element disposed on the second substrate and arranged to receive reflected light of the laser light of the first wavelength; and a second light receiving element disposed on the second substrate and arranged to receive reflected light of the laser light of the second wavelength, wherein the first laser emitting component is further configured to produce laser light of a third wavelength different from the first wavelength and different from the second wavelength, wherein the second laser emitting component further comprises a third receiving element disposed on the second substrate to receive reflected light of the laser light of the third wavelength.