Heat radiator

Abstract

A heat radiator 10 includes: a first member 12 which has a recessed portion 12c in one side thereof and which has a large number of substantially circular truncated conical protruding portions 12d formed on the bottom face of the recessed portion 12c; and a second member which is fixed to the first member 12 on the side of the recessed portion 12c for defining an internal cavity and which contacts the tip end face of each of the large number of protruding portions 12d of the first member 12, wherein the first member 12 has a pair of through holes 12e for supplying a coolant into the internal cavity and for discharging the coolant from the internal cavity.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be understood more fully from the detailed description given here below and from the accompanying drawings of the preferred embodiments of the invention. However, the drawings are not intended to imply limitation of the invention to a specific embodiment, but are for explanation and understanding only.

In the drawings:

FIG. 1 is a plan view of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 2 is a bottom view of a radiating member of the heat radiator of FIG. 1 before a lid member is mounted on the radiating member;

FIG. 3 is a sectional view of the radiating member of the heat radiator taken along line III-III of FIG. 1 before a lid member is mounted on the radiating member;

FIG. 4 is a sectional view of the heat radiator of FIG. 1 when a lid member is mounted on the radiating member;

FIG. 5 is a bottom view of a radiating member of the second preferred embodiment of a heat radiator according to the present invention;

FIG. 6 is a bottom view of a first modified example of a radiating member of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 7 is a sectional view of the radiating member of FIG. 6;

FIG. 8 is a bottom view of a second modified example of a radiating member of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 9 is a sectional view of the radiating member of FIG. 8;

FIG. 10 is a sectional view of a third modified example of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 11 is a sectional view of a fourth modified example of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 12 is a plan view of the heat radiator of FIG. 11;

FIG. 13 is a sectional view of a fifth modified example of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 14 is a sectional view of a sixth modified example of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 15 is a sectional view of a seventh modified example of the first preferred embodiment of a heat radiator according to the present invention;

FIG. 16 is a sectional view of a mold used for producing a radiating member in the fourth through seventh modified examples of the first preferred embodiment of a heat radiator according to the present invention; and

FIG. 17 is a sectional view of a mold used for producing a lid member in the fourth modified example of the first preferred embodiment of a heat radiator according to the present invention.

Claims

1. A heat radiator comprising: a metal body having an internal cavity which is formed therein and which has facing two inside surfaces, said metal body having a through hole for establishing a communication between the internal cavity and the outside; anda large number of pillar portions which extend between the facing two inside surfaces and which are arranged at intervals.

2. A heat radiator as set forth in claim 1, wherein said metal body comprises: a first member having said large number of pillar portions which are integrated therewith; anda second member which is fixed to the first member for defining said internal cavity.

3. A heat radiator as set forth in claim 1, wherein said metal body comprises: a first member which has a recessed portion in one side thereof and which has said large number of pillar portions integrated with a bottom face of the recessed portion; anda second member which contacts a tip end of each of said large number of pillar portions of said first member.

4. A heat radiator as set forth in claim 1, wherein each of said large number of pillar portions has a shape of substantially circular truncated cone, substantially circular cone or substantially rectangular parallelepiped.

5. A heat radiator as set forth in claim 1, wherein said metal body is made of aluminum or an aluminum alloy.

6. A metal/ceramic bonding substrate with heat radiator, which comprises: a ceramic substrate; anda metal circuit plate bonded to one side of the ceramic substrate,wherein a heat radiator as set forth in claim 1 is bonded to the other side of the ceramic substrate.