Semiconductor light-emitting device

A semiconductor light-emitting device, comprising:

• a metallic cap including a light-emitting window, a first circular cylinder having a first inner diameter and a second circular cylinder having a second inner diameter, made from a metallic plate, and formed in a substantially circular cylindrical shape that overlaps the first circular cylinder on the second circular cylinder, the first inner diameter of the first circular cylinder being smaller than the second inner diameter of the second circular cylinder, the light-emitting window made of a transparent material, and being sealed using the metallic plate of the first circular cylinder;
• a metallic base having a top surface, a bottom surface, a side surface and through holes made from a metallic plate, and formed in a substantially planar shape, the top surface of metallic base including an outer circumference, and also mounting the metallic cap on the top surface of the metallic base so as to expose the outer circumference of the top surface from the metallic cap;
• terminal pins being hermetically sealed in a respective one of the through holes of the metallic base, respectively, and passing through the metallic base, and further extending in an opposite direction of the top surface of the metallic base;
• a semiconductor light source having electrodes, a light-emitting surface and an optical axis mounted on the top surface of the metallic base, being airproofed between the metallic cap and the metallic base, the light-emitting surface of the semiconductor light source facing the light-emitting window of the metallic cap, the optical axis of the semiconductor light source intersecting with the light-emitting window of the metallic cap at a substantially right angle, and thereby operating as an optical axis of the semiconductor light-emitting device, and each of the electrodes of the semiconductor light source being electrically connected to a respective one of the terminal pins;
• a heat sink plate having a top surface and a bottom surface, and the top surface of the heat sink contacting with the bottom surface of the metallic base;
• a holder having an inner bottom surface, an outer bottom surface, a first flange, a second flange, an inner side surface and a body including the inner bottom surface and the inner side surface, the holder attaching the metallic base on the top surface of the heat sink plate along with the metallic cap between the inner bottom surface of the body of the holder and the top surface of the heat sink plate, and therefore the inner bottom surface of the body of the holder contacting with at least the outer circumference of the top surface of the metallic base, the first flange of the holder extending in an opposite direction of the metallic base from the body along the heat sink plate in a cross-sectional view taken along the optical axis of the device, and the second flange of the holder extending toward the first circular cylinder of the holder from the body over the second circular cylinder in the cross-sectional view taken along the optical axis of the device;
• a thermal interface material (TIM) layer being disposed between the top surface of the heat sink plate and the outer bottom surface of the holder;
• and
• a thermal conductive elastic member disposed between the side surface of the metallic base and the inner side surface of the body of the holder.