U.S. patent application number 11/953727 was filed with the patent office on 2009-06-11 for heat sink and a method of manufacturing the heat sink.
This patent application is currently assigned to Hong Fu Jin Precision Industry (ShenZhen) CO., LTD.. Invention is credited to Yu-Chen Lin, Hong-Bo Xu.
Application Number | 20090145580 11/953727 |
Document ID | / |
Family ID | 40720412 |
Filed Date | 2009-06-11 |
United States Patent
Application |
20090145580 |
Kind Code |
A1 |
Lin; Yu-Chen ; et
al. |
June 11, 2009 |
Heat sink and a method of manufacturing the heat sink
Abstract
A heat sink includes a base plate and a plurality of thin-sheet
fins. The base plate has a plurality of recesses and protruding
ribs formed between every two recesses. The protruding ribs are
spaced by the respective recesses with an equal space. Each
thin-sheet fin comprises a folded engaging portion and a
dissipating portion connecting with the engaging portion. The
engaging portion has a first extending portion and a second
extending portion parallel to the first extending portion and
connecting with the first extending portion. The engaging portions
are inserted into the recesses of the base plate and abut against a
bottom of the recesses.
Inventors: |
Lin; Yu-Chen; (Tu-Cheng,
TW) ; Xu; Hong-Bo; (Shenzhen, CN) |
Correspondence
Address: |
PCE INDUSTRY, INC.;ATT. Steven Reiss
458 E. LAMBERT ROAD
FULLERTON
CA
92835
US
|
Assignee: |
Hong Fu Jin Precision Industry
(ShenZhen) CO., LTD.
Shenzhen City
CN
Hon Hai Precision Industry CO., LTD.
Tu-Cheng
TW
|
Family ID: |
40720412 |
Appl. No.: |
11/953727 |
Filed: |
December 10, 2007 |
Current U.S.
Class: |
165/80.3 ;
29/890.03 |
Current CPC
Class: |
Y10T 29/4935 20150115;
F28F 3/02 20130101; H01L 23/3672 20130101; H01L 2924/0002 20130101;
H01L 2924/0002 20130101; H01L 2924/00 20130101 |
Class at
Publication: |
165/80.3 ;
29/890.03 |
International
Class: |
F28F 7/00 20060101
F28F007/00 |
Claims
1. A heat sink comprising: a base plate having a plurality of
recesses and protruding ribs formed between every two adjacent
recesses; and a plurality of thin-sheet fins comprising a folded
engaging portion and a dissipating portion connecting with the
engaging portion, the engaging portion having a first extending
portion and a second extending portion parallel to the first
extending portion and connecting with the first extending portion,
the engaging portion being inserted into the recesses of the base
plate and abutting against a bottom of the recesses.
2. The heat sink as described in claim 1, wherein each second
extending portion has a free end, the free end abuts against
corresponding protruding rib of the base plate.
3. The heat sink as described in claim 1, wherein the first and
second extending portions of each thin-sheet fin are curved to have
portions thereof inclined to the dissipating portion of each
thin-sheet fin.
4. The heat sink as described in claim 1, wherein the first and
second extending portions of the engaging portion of each
thin-sheet fin are continuously curved and have wavy
configurations.
5. The heat sink as described in claim 1, wherein each recess has a
configuration corresponding to that of the engaging portion of each
thin-sheet fin.
6. The heat sink as described in claim 1, wherein the base plate is
made of aluminum extrusion.
7. The heat sink as described in claim 1, wherein each of the
protruding ribs has a dent on a center of a top surface
thereof.
8. A method of manufacturing a heat sink, the method comprising the
steps of: a) forming a plurality of recesses at a surface of a base
plate and protruding ribs respectively spaced by the recesses, each
recess having two side faces; b) folding an end of each thin-sheet
fin to form an engaging portion having a first extending portion
and a second extending portion; c) inserting the engaging portions
of the thin-sheet fins in the recesses; and d) punching the
protruding ribs by plastic deformations of protruding ribs, the
side faces of the recesses crimping the thin-sheet fins in the
recesses.
9. The method as described in claim 8, wherein the base plate is
made by aluminum extrusion.
10. The method as described in claim 8, wherein the second
extending portion is parallel and close to the first extending
portion.
11. The method as described in claim 8, wherein the step b) further
comprises curving the first and second extending portion so that a
lower portion of each engaging portion is inclined to the other
portion of each thin-sheet fin.
12. The method as described in claim 8, wherein the step b) further
comprises curving the first and second extending portion into wavy
configurations.
13. The method as described in claim 8, wherein each of the
protruding ribs has a dent on a center of a top surface
thereof.
14. The method as described in claim 8, wherein the thin-sheet fins
are inserted from a side of the base plate along extending
directions of the recesses in the step c).
15. A heat sink comprising: a base plate defining a plurality of
first recesses and a plurality of second recesses communicating
with the first recesses, each first recess inclined relative to
each second recess; and a plurality of fins inserted into the first
and second recesses, each fin comprising a folded first portion
received in corresponding first recess and a second portion
vertically extending from the first portion and partially received
in corresponding second recess; wherein a step portion is formed at
a joint of the each first and second recess, and a free end of the
first portion abuts against the step portion.
16. The heat sink as described in claim 15, wherein the first
portion of each fin is inclined relative to the second portion.
17. The heat sink as described in claim 15, wherein the first
portion of each fin has a substantially U-shaped configuration.
18. The heat sink as described in claim 17, wherein a bottom of the
first portion abuts against a bottom of the first recess of the
base plate.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a heat sink, and more
particularly to a heat sink which is used to remove heat from an
electronic component. The present invention is also related to a
method of manufacturing the heat sink.
[0003] 2. Description of Related Art
[0004] With the advance of integrated circuit (IC) technology, CPUs
are made more and more compact and has higher operation speed than
old ones. Thereby, a great deal of heat is generated. However in
current trend, it is desired that the electronic devices have
compact size, that is, they are smaller, and thus, it is required
that the heat dissipating devices of the electronic devices are
compact and has powerful heat dissipating ability.
[0005] Referring to FIGS. 7-8, a conventional heat sink comprises a
substrate 3 and a plurality of heat dissipating fins 4. A plurality
of recesses 31 is defined at a surface of the substrate 3. The
substrate 3 defines a groove (not labeled) between every two
recesses 31. The recesses 31 have two straight side walls (not
labeled). The heat dissipating fins 4 are placed in the recesses
31. A plurality of punching weights 41 punch the grooves so that
the walls of the recesses 31 deform and thus the heat dissipating
fins 4 are clamped in the recesses 31 tightly. Thereby, the
assembly of the heat sink is finished.
[0006] Although above the structure can be used, gaps are generated
between the fins 4 and the recesses 31. The lower ends of the fins
4 are straight, thus contact areas between the substrate and the
fins are small. Heat generated by the CPUs will be transferred to
the substrate 3 and thus to the fins 4. The heat can not be quickly
transferred to the whole fins since the gaps and the small contact
areas between the fins 4 and the recesses 31.
[0007] A solution for enhancing the contact areas between the fins
and the substrate of the heat sink is needed.
SUMMARY OF THE INVENTION
[0008] A heat sink includes a base plate and a plurality of
thin-sheet fins. The base plate has a plurality of recesses and
protruding ribs formed between every two recesses. The protruding
ribs are spaced by the respective recesses with an equal space.
Each thin-sheet fin comprises a folded engaging portion and a
dissipating portion connecting with the engaging portion. The
engaging portion has a first extending portion and a second
extending portion parallel to the first extending portion and
connecting with the first extending portion. The engaging portions
are inserted into the recesses of the base plate and abut against a
bottom of the recesses.
[0009] Other advantages and novel features of the present invention
will become more apparent from the following detailed description
when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Many aspects of the present heat sink can be better
understood with reference to the following drawings. The components
in the drawings are not necessarily drawn to scale, the emphasis
instead being placed upon clearly illustrating the principles of
the present heat sink. Moreover, in the drawings, like reference
numerals designate corresponding parts throughout the several
views.
[0011] FIG. 1 is an exploded, isometric view of a heat sink in
accordance with a first embodiment of the present invention;
[0012] FIG. 2 is an assembled view of FIG. 1;
[0013] FIG. 3 is a front view of the heat sink of FIG. 2;
[0014] FIG. 4 is an enlarged view of a circled portion IV of FIG.
3;
[0015] FIG. 5 is a front view of a heat sink in accordance with a
second embodiment of the present invention;
[0016] FIG. 6 is an enlarged view of a circled portion VI of FIG.
5;
[0017] FIG. 7 is a schematic perspective view of a heat sink in
accordance with related art after a plurality of punching weights
punching grooves of the heat sink; and
[0018] FIG. 8 is a schematic perspective view of the heat sink in
accordance with related art after the punching weights punching the
grooves of the heat sink.
DETAILED DESCRIPTION OF THE INVENTION
[0019] Referring to FIGS. 1-2, a heat sink (not labeled) of the
first embodiment of the present invention is shown. The heat sink
comprises a base plate 10 and a plurality of thin-sheet fins
20.
[0020] Referring to FIGS. 3-4, the base plate 10 has a flat bottom
surface (not labeled) and a top surface (not labeled) opposite to
the bottom surface. The base plate 10 defines a plurality of
recesses 12 at the top surface thereof and forming elongated
protruding ribs 15 spaced by the respective recesses 12 with equal
spaces. Each recess 12 has two side faces (not labeled) on the two
adjacent protruding ribs 15. Each protruding rib 15 has a tooth
configuration and has a dent 18 at a center of a top surface
thereof. Each recess 12 consists of a vertical recess (not labeled)
perpendicular to a bottom surface of the base plate 10, and an
inclined recess (not labeled) below the vertical recess and
inclined to the bottom surface of the base plate 10. A projection
19 extends from a side of an upper portion of each protruding rib
15 in a corresponding vertical recess of the recess 12.
[0021] Each thin-sheet fin 20 comprises a folded engaging portion
21 and a dissipating portion 28 connecting with the engaging
portion 21 and perpendicularity to the bottom surface of the base
plate 10. Each engaging portion 21 comprises a curved first
extending portion 22 and a curved second extending portion 24
substantially parallel and close to the first extending portion 22.
Each first extending portion 22 has an upper vertical portion 225
connecting with the dissipating portion 28, and an inclined portion
226 distant to the dissipating portion 28. The inclined portion 226
connects with the vertical portion 225 in a manner such that there
is an obtuse angle between the vertical portion 225 and the
inclined portion 226. Each second extending portion 24 has a lower
inclined portion 246 connecting with a bottom end of the inclined
portion 226 of the first extending portion 22, and an upper
vertical portion 245 connecting with the inclined portion 226. The
inclined portions 226, 246 are close to each other and the vertical
portions 225, 245 are close to each other. The vertical portion 245
of each second extending portion 24 has a free end 247.
[0022] In assembly, the engaging portions 21 of the thin-sheet fins
20 are inserted into the recesses 12 of the base plate 10 with the
dissipating portions 28 being perpendicularity to the bottom
surface of the base plate 10, wherein the vertical portions 225,
245 of the engaging portions 21 are received in the vertical
recesses of the recesses 12, and the inclined portion 226, 246 are
received in the inclined recesses. The first and second extending
portions 22, 24 of the engaging portions 21 attach to the side
faces of the recesses 12. The free end 247 of the second extending
portion 24 of each thin-sheet fin 20 abuts against the projection
19 of each protruding rib 15 of the base plate 10. A plurality of
punching sheets (not show) punch the dents 18 of the protruding
ribs 15 of the base plate 10, then the protruding ribs 15 are
extruded downwards and produce plastic deformations. The engaging
portions 21 of the thin-sheet fins 20 are clamped by side faces of
the recesses 12 by plastic deformations of the protruding ribs 15.
Thus the protruding ribs 15 are brought into contact with the
thin-sheet fins 20. Therefore, the thin-sheet fins 20 are tightly
secured to the recesses 12 and the heat sink is formed.
[0023] Because the engaging portion 21 of each thin-sheet fin 20
has the folded first and second extending portions 22, 24
respectively contacting with the side faces of recesses 12, the
contact areas between the thin-sheet fins 20 and the protruding
ribs 15 are so larger that the heat dissipating effect of the heat
sink is improved. Furthermore, the free end 247 of the second
extending portion 24 of each thin-sheet fin 20 abuts against the
projection 19 of each protruding rib 15 of the base plate 20, so
that the thin-sheet fin 20 is firmly crimped by the base plate 20.
Since each of the protruding rib 15 has a dent 18, each of the
punching sheets can punch on the protruding ribs 15 more exactly
and easily.
[0024] A method of manufacturing the heat sink in the first
embodiment comprising the steps of:
[0025] a) forming a plurality of recesses 12 at a top surface of a
base plate 10 and protruding ribs 15 respectively spaced by the
recesses 12 by aluminum extrusion, the protruding ribs 15 has a
dent 18 on a center of a top surface thereof;
[0026] b) folding an end of each thin-sheet fin 20 to form a
vertical dissipating portion 28 and an engaging portion 21 having a
first extending portion 22 and a second extending portion 24
parallel and close to the first extending portion 22; curving the
first and second extending portion 22, 24 so that the first
extending portion 22 has an upper vertical portion 225 and a lower
inclined portion 226 connecting with the vertical portion 225, and
the second extending portion 24 has a lower inclined portion 246
and an upper vertical portion 245;
[0027] c) inserting the engaging portions 21 of the thin-sheet fins
20 in the recesses 12 from a side of the base plate 10 along
extending directions of the recesses 12; and
[0028] d) punching the dent 18 of the protruding ribs 15 by plastic
deformations of protruding ribs 15, the side faces of the recesses
12 crimping the thin-sheet fins 20 in the recesses 12.
[0029] FIGS. 5-6 show a heat sink (not labeled) of a second
embodiment of the present invention. In this embodiment, the heat
sink comprises a base plate 10a and a plurality of thin-sheet fins
20a. Each thin-sheet fin 20a is similar to the thin-sheet fin 20 in
the first embodiment, having a folded engaging portion 21a and a
dissipating portion 28a connecting with the engaging portion 21a.
The engaging portion 21a has a curved first extending portion 22a
and a curved second extending portion 24a parallel to the first
extending portion 22a and connecting with a bottom end of the first
extending portion 22a. The first and second extending portion 22a,
24a are together continuously curved two times so as to have wavy
configurations. In other word, the first and second extending
portion 22a, 24a respectively have three inclined portions (not
labeled) inclined to the dissipating portion 28a.
[0030] The base plate 10a is similar to the base plate 10 in the
first embodiment. The base plate 10a has a bottom surface and a top
surface opposite to the bottom surface. The base plate 10a defines
a plurality of recesses 12a at the top surface thereof and forming
protruding ribs 15a spaced by the respective recesses 12a with
equal spaces. Each recess 12a has two side faces (not labeled) on
the two adjacent protruding ribs 15a. The two side faces of each
recess 12a have wavy configurations corresponding to the first and
second extending portions 22a, 24a of the engaging portion 21a of
each thin-sheet fin 20a.
[0031] A method of manufacturing the heat sink in the second
embodiment is similar to that in the first embodiment, only the
step b) comprises folding an end of each thin-sheet fin 20a to form
an engaging portion 21a having a first extending portion 21a and a
second extending portion 22a parallel to the first extending
portion 21a; curving the first and second extending portion 22a,
24a into wavy configurations.
[0032] In the second embodiment, the engaging portions 21a of the
thin-sheet fins 20a having wavy configurations are engaged into the
recesses 12a of the base plate 10a correspondingly having wavy
configurations. Thus the thin-sheet fins 20a are not easy to be
drawn out from the base plate 10a, and the contact areas between
the thin-sheet fins 20a and the protruding ribs 15a are so larger
that the heat dissipating effect of the heat sink is improved.
[0033] It is believed that the present embodiments and their
advantages will be understood from the foregoing description, and
it will be apparent that various changes may be made thereto
without departing from the spirit and scope of the invention or
sacrificing all of its material advantages, the examples
hereinbefore described merely being preferred or exemplary
embodiments of the invention.
* * * * *