Semiconductor laser device
View Patent ↗A semiconductor laser beam device, comprising a stem type package having a base part and a heat sink part, wherein the heat sink part is cylindrically formed so as to be concentric to the base part, a groove is formed along the axial direction of the heat sink part, and a semiconductor laser beam element is disposed at the bottom part of the inner wall surfaces of the groove whereby the radiating capability of the semiconductor laser beam device can be increased by increasing the volume of the heat sink part, and the element can be protected by the groove.
1. A semiconductor laser device comprising:
a cylindrical heat sink having a groove formed therein along an axial direction thereof and having an outer bottom surface thereof formed flat, the groove being increasingly wide in an upward direction and having planar side walls, wherein the distance between the side walls is greater at a top portion of the groove than at the bottom portion of the groove; and
a semiconductor laser element placed on an inner wall surface of the groove.
2. A semiconductor laser device having a package comprising a base and a heat sink and having a semiconductor laser element placed on the heat sink, wherein the heat sink is cylindrical, in that a groove is formed in the heat sink along an axial direction thereof, the groove being increasingly wide in an upward direction and having planar side walls, wherein the distance between the side walls is greater at a top portion of the groove than at the bottom portion of the groove, in that the semiconductor laser element is placed on an inner wall surface of the groove, and in that the heat sink has an outer bottom surface thereof formed flat.
3. The semiconductor laser device according to one of claims 1 and 2 , wherein the groove is formed so deep as to include a center axis of the cylindrical heat sink.
4. The semiconductor laser device according to one of claims 1 and 2 , wherein the groove is so shaped as to completely house therein the semiconductor laser element.
5. The semiconductor laser device according to one of claims 1 and 2 , wherein the groove is so shaped as to completely house therein the semiconductor laser element along with bonding wires connected thereto.
6. The semiconductor laser device according to one of claims 1 and 2 , wherein walls located at both sides of the groove extend to a height higher than the semiconductor laser element.
7. The semiconductor laser device according to one of claims 1 and 2 , wherein the groove is formed by cutting off an arc surface of the heat sink equivalent to a center angle of 180 degrees or less.
8. The semiconductor laser device according to claim 2 , wherein a lead pin is provided that, at one end thereof, penetrates the base, and the lead pin is, at the other end thereof, located in the groove.
9. The semiconductor laser device according to claim 2 , wherein two lead pins are provided that, at one ends thereof, penetrate the base, and the lead pins are, at one ends thereof, located in the groove.
10. The semiconductor laser device according to claim 9 , wherein a plane that includes the two lead pins is parallel to an inner bottom surface of the groove.
11. The semiconductor laser device according to one of claims 1 and 2 , wherein the heat sink has a tapered surface formed along an outer edge of a tip end thereof.
12. The semiconductor laser device according to claim 2 , wherein the base and the heat sink are formed of a same metal.