Heat radiating member for heat generating device

Details Heat radiating member for heat generating device Heat radiating member for heat generating device

1999-07-22

2001-06-26

Picard, Leo P. (Department: 2835)

Electricity: electrical systems and devices

Housing or mounting assemblies with diverse electrical...

For electronic systems and devices

C361S704000, C361S707000, C361S708000, C174S050510

Reexamination Certificate

active

06252776

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a heat radiating member for a heat generating device, capable of improving the heat radiating characteristics of the heat generating device, such as an integrated circuit in an electronic equipment, which generates heat while being used.
2. Description of the Related Art
FIG. 1
shows a conventional heat radiating member of this type for a heat generating device. An integrated circuit (IC)
3
is mounted on a printed board
2
and a radiator
1
is fastened onto the printed board
2
by screws
4
to surround the IC
3
. Heat-conducting rubber
5
is interposed between the inner surface of the radiator
1
and the upper surface of the IC
3
and the IC
3
comes in contact with the radiator
1
through this heat-conducting rubber
5
.
The heat-conducting rubber
5
has high heat conductivity and high stretching characteristics. Due to this, the heat-conducting rubber
5
absorbs the irregularity of the thickness of the IC
3
and that of the height of the radiator
1
, conducts good heat transfer while ensuring the contact between the IC
3
and the heat-conducting rubber
5
and that between the heat-conducting rubber
5
and the radiator
1
, and then cools the IC
3
.
In the above-stated conventional heat transfer member for the heat generating device, while the heat-conducting rubber
5
has excellent heat transfer efficiency, it has disadvantageously low heat conductivity. That is, the heat conductivity of the heat-conducting rubber
5
is as low as about 5 W/m° C., which is extremely low compared with that of metal, such as copper, i.e., 380 W/m° C. Due to this disadvantage, the conventional heat transfer member produces an insufficient heat radiating effect.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a heat radiating member for a heat generating device having a high heat radiating effect.
A heat radiating member for a heat generating device according to the present invention is characterized by comprising a radiator provided on a board to surround a heat generating device mounted on the board, the radiator directly contacting with the heat generating device; and a heat-conducting elastic member interposed between the radiator and the board.
The heat radiating member for the heat generating device may be constituted such that part of an inner surface of the radiator protrudes to thereby form a protrusion at which the radiator contacting with the heat generating device. The board may be a printed wiring board and the heat generating device may be an integrated circuit device mounted on the printed wiring board. The heat radiating member is formed of, for example, copper.
According to the present invention, the radiator directly contacts with the heat generating device, so that the heat generated at the heat generating device is transferred to the radiator with high efficiency and the heat is radiated at the radiator with high efficiency. Moreover, a heat-conducting elastic member is provided between the radiator and the substrate, so that the irregularities of the heights of the heat generating device and of the radiator are absorbed by this elastic member.


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patent: 6023413 (2000-02-01), Umezawa
patent: 8-139235 (1996-05-01), None

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