Patent ID: 8494019

Claim:
A semiconductor laser device, mounting a semiconductor laser element array of multi-beam structure on a sub-mount, said semiconductor laser element array of multi-beam structure comprising: a semiconductor substrate; a cathode electrode of a first conductivity type, which is formed on a first surface of said semiconductor substrate; a semiconductor layer, which is formed on a second surface of said semiconductor substrate, and which includes a plural number of light emitting portions within an inside thereof; a plural number of anode electrodes of a second conductivity type, which are formed above said plural number of light emitting portions, respectively; and a supporting portion, which is provided spaced away from and outside of a region where said plural number of light emitting portions are formed, and further on one surface of said sub-mount are connected said anode electrodes of the second conductivity type of said semiconductor laser element array, respectively, through a jointing member, wherein said supporting portion does not include a light emitting portion, wherein said jointing member is comprised of a high thermal conductivity material, and said jointing member is formed as one piece to cover both said supporting portion and at least one of said anode electrodes of the second conductivity type neighboring thereto, and further on said anode electrodes of the second conductivity type is formed a groove portion located between said supporting portion neighboring thereto and said light emitting portion and configured to reduce shear stress generated within the light emitting portion, and further comprising an insulating film formed to cover an entire upper surface of the supporting portion to prevent current flow through the supporting portion.