Patent ID: 7804878

Claim:
A nitride semiconductor laser device, comprising: a nitride semiconductor layer of a first conductivity type, an active layer of a nitride semiconductor, a nitride semiconductor layer of a second conductivity type, and an electrode pad for the second conductivity type stacked in this order on a main surface of a conductive substrate, wherein a stripe-like waveguide structure parallel to said active layer is formed, and an area of said electrode pad for the second conductivity type is more than 2% and less than 60% of an area of said main surface of said substrate, wherein an area not having said electrode pad for the second conductivity type on an upper surface of said semiconductor layer of the second conductivity type is lower by more than 10% in reflectance with respect to almost the entire wavelength range of incident illumination light vertical to said nitride semiconductor laser device as compared to the other area having said electrode pad for the second conductivity type during automatic image recognition.