U.S. patent application number 11/127080 was filed with the patent office on 2006-11-16 for radiation board.
Invention is credited to Win-Haw Chen, Mao-Ching Lin, Shu-Ju Lin.
Application Number | 20060254755 11/127080 |
Document ID | / |
Family ID | 37417990 |
Filed Date | 2006-11-16 |
United States Patent
Application |
20060254755 |
Kind Code |
A1 |
Chen; Win-Haw ; et
al. |
November 16, 2006 |
Radiation board
Abstract
A radiation board consists of a case and a lid. The case has a
plurality of circulation channels formed on an inner wall. The lid
seals the case to confine an operation fluid in the circulation
channels of the case. The lid has miniature flutes corresponding to
the circulation channels. Heat generated by a heat-generating
element during operation is transferred through the lid to the
operation fluid to vaporize the operation fluid. The miniature
flutes help to condense the vaporized operation fluid into a liquid
again. The operation fluid circulates in the case through the
circulation channels to evenly distribute heat to the entire
device. The radiation board is easy to fabricate at a low cost.
Inventors: |
Chen; Win-Haw; (Taipei,
TW) ; Lin; Mao-Ching; (Taipei, TW) ; Lin;
Shu-Ju; (Taipei, TW) |
Correspondence
Address: |
HARNESS, DICKEY & PIERCE, P.L.C.
P.O. BOX 8910
RESTON
VA
20195
US
|
Family ID: |
37417990 |
Appl. No.: |
11/127080 |
Filed: |
May 12, 2005 |
Current U.S.
Class: |
165/104.33 ;
257/E23.088 |
Current CPC
Class: |
H05K 7/1023 20130101;
H01L 2924/00 20130101; F28D 15/0233 20130101; H01L 2924/0002
20130101; H01L 2924/0002 20130101; H01L 23/427 20130101 |
Class at
Publication: |
165/104.33 |
International
Class: |
F28D 15/00 20060101
F28D015/00 |
Claims
1. A radiation board, comprising: a case having a plurality of
circulation channels formed on an inner wall to contain an
operation fluid and a longitudinal strip between two neighboring
circulation channels; and a lid bonded to the longitudinal strip to
seal one side of the case to confine the operation fluid in the
case having a plurality of miniature flutes smaller than the
circulation channels on one side thereof corresponding to the
circulation channels; wherein one side of the lid is mounted onto a
heat generating element to transfer heat of the heat generating
element to the operation fluid to cause a portion of the operation
fluid to vaporize, the vaporized operation fluid being condensed to
become liquid phase which circulates through the circulation
channels to evenly distribute the heat absorbed by the operation
fluid to the case and the lid.
2. The radiation board of claim 1, wherein the case has a plurality
of radiation fins on an outer surface to improve heat dissipation
effect of the case.
3. The radiation board of claim 1, wherein the miniature flutes
have substantially a V-shape cross section.
4. The radiation board of claim 3, wherein the V-shape cross
section has an included angle about 60 degrees.
5. The radiation board of claim 1, wherein the operation fluid is
water.
6. The radiation board of claim 1, wherein the operation fluid is
acetone.
7. The radiation board of claim 1, wherein the case further has
cross channels to allow the neighboring circulation channels to
communicate with one another.
8. The radiation board of claim 1, wherein the miniature flutes are
formed on the lid in a parallel manner.
9. The radiation board of claim 1, wherein the circulation channels
are formed in the case in a parallel manner.
10. The radiation board of claim 1, wherein the surface of the
miniature flutes is treated to become a coarse surface.
Description
FIELD OF THE INVENTION
[0001] The invention relates to a radiation board adopted for use
on heat generating elements of electronic devices, and particularly
to a radiation board that is easy to fabricate at a low cost.
BACKGROUND OF THE INVENTION
[0002] With continuous advances in semiconductor manufacturing
techniques, the number of transistors in electronic elements and
chip sets of electronic products is increasing. Electricity
consumption and heat generated by the electronic elements have
become urgent issues to be resolved.
[0003] Among the heat generating elements in electronic products,
heat generated by the central processing unit (CPU) is most
significant. Researching on heat dissipation techniques for the
heat generating elements of electronic products is known in the
art. FIG. 1 illustrates a conventional radiation device consisting
of an upper lid 11 and a lower lid 12 that are coupled to form a
housing compartment to house a conductive plate 13, a spacer 14
with cubical strips formed thereon and a flow channel plate 15. The
housing compartment is divided into a plurality of flow passages to
hold fluid. The fluid absorbs the heat generated by the
heat-generating element and flows in the housing compartment. FIG.
2 depicts another radiation technique that has a case 20 housing a
plurality of cubical members 21. Fluid is filled in the case 20 and
channeled by the cubical members 21 to circulate inside the case
20. FIG. 3 shows yet another radiation technique that has a case 30
housing channel members 31 formed in special geometric shapes to
channel a fluid to circulate in the case 30.
[0004] All the radiation devices mentioned above aim to distribute
the heat energy of the heat-generating element evenly to the entire
device to achieve heat dissipation. While they have some degree of
effect, they consist of many elements and have complicated
structures. Fabrication is difficult, production yield is
undesirable and production cost is high. Thus there is still room
for improvement.
SUMMARY OF THE INVENTION
[0005] The primary object of the invention is to provide a
radiation board adopted for use on electronic products that is
easier to fabricate at a lower cost.
[0006] The radiation board according to the invention mainly
includes a case and a lid. The case has an inner wall forming a
plurality of circulation channels and a bulged longitudinal strip
between two neighboring circulation channels. The lid is bonded to
the longitudinal strips and seals the case to keep an operation
fluid in the case. The lid has miniature flutes corresponding to
the circulation channels that are much smaller than the circulation
channels. One side of the lid is in contact with a heat-generating
element to transfer the heat that it generates during operation to
the operation fluid filled in the case. A portion of the operation
fluid is vaporized. Through the miniature flutes, the vaporized
operation fluid is cooled and re-condensed into the liquid phase
operation fluid, and circulated in the case through the circulation
channels. Hence the heat generated by the heat-generating element
during operation is evenly distributed on the entire device to
achieve an improved heat dissipation effect.
[0007] The foregoing, as well as additional objects, features and
advantages of the invention will be more readily apparent from the
following detailed description, which proceeds with reference to
the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a schematic view of a conventional radiation
device.
[0009] FIG. 2 is a schematic view of another conventional radiation
device.
[0010] FIG. 3 is a schematic view of yet another conventional
radiation device.
[0011] FIG. 4 is an exploded view of the radiation board of the
invention.
[0012] FIGS. 5A and 5B are fragmentary sectional and enlarged views
of the radiation board of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] Referring to FIGS. 4, 5A and 5B, the radiation board
according to the invention is adopted for use on electronic
products. It includes a case 40 and a lid 50. The case 40 has an
inner wall forming a plurality of parallel circulation channels 41.
The outer surface of the case 40 corresponding to circulation
channels 41 has a plurality of radiation fins 60. Every two
neighboring circulation channels 41 are interposed by a bulged
longitudinal strip 43. There is a cross channel 42 running across
the distal ends of the circulation channels 41 to allow the
circulation channels 41 to communicate with one another.
[0014] The lid 50 is bonded tightly to the longitudinal strip 43
and seals the case 40 on one side. On the lid 50 there is a
plurality of parallel miniature flutes 51 corresponding to the
circulation channels 41. The miniature flutes 51 are smaller than
the circulation channels 41, and are formed in a V-shape
cross-section with an included angle of about 60 degrees. Moreover,
the surface of the miniature flutes 51 is treated to make it
coarse.
[0015] As the lid 50 is sealed on the case 40, the operation fluid
70 is confined in the case 40 and may flow freely among the
circulation channels 41, cross channel 42 and miniature flutes 51.
Many substances may serve as the operation fluid 70. Water and
acetone are most commonly used.
[0016] The radiation board of the invention may be mounted onto the
heat-generating element 80 of an electronic product to transfer and
disperse the heat generated by the heat-generating element 80
during operation. When in use, first keep one side of the lid 50 in
close contact with the heat-generating element 80; heat generated
by the heat-generating element 80 is transferred through the lid 50
to the operation fluid 70 filled in the case 40; a portion of the
operation fluid 70 absorbs the heat and becomes a vapor and liquid
mixture, or is vaporized, depending on the kind of operation fluid
70 and the level of thermal energy provided by the heat-generating
element 80. That is, the operation fluid 70 is vaporized if it
absorbs enough heat. After the operation fluid 70 has absorbed the
heat and filled in the closed space formed by the case 40 and the
lid 50, it flows in the circulation channels 41, cross channel 42
and miniature flutes 51 under natural convection caused by
differing temperatures and densities. The vaporized operation fluid
70 circulates in the case 40 due to channeling of the circulation
channels 41. The coarse surface of the miniature flutes 51 helps to
condense the vaporized operation fluid 70 into a liquid. Hence the
heat generated by the heat-generating element 80 during operation
is evenly distributed to the entire device and an improved heat
dissipation effect is achieved.
[0017] Compared with the conventional heat radiation apparatus that
are difficult to fabricate, have low production yields and high
costs, the radiation board of the invention may be fabricated at a
lower cost, and has an improved production yield.
[0018] While the preferred embodiment of the invention has been set
forth for the purpose of disclosure, modifications of the disclosed
embodiment of the invention as well as other embodiments thereof
may occur to those skilled in the art. Accordingly, the appended
claims are intended to cover all embodiments which do not depart
from the spirit and scope of the invention.
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