U.S. patent application number 12/967249 was filed with the patent office on 2011-06-30 for heat sink.
This patent application is currently assigned to FUJITSU LIMITED. Invention is credited to Hisao ANZAI.
Application Number | 20110155352 12/967249 |
Document ID | / |
Family ID | 44186032 |
Filed Date | 2011-06-30 |
United States Patent
Application |
20110155352 |
Kind Code |
A1 |
ANZAI; Hisao |
June 30, 2011 |
HEAT SINK
Abstract
A heat sink includes a base, a first fin provided on the base
and including a first cutout portion, a first heat pipe including a
first linear portion and a first curved portion, the first curved
portion being provided in the first cutout portion, and a second
heat pipe including a second linear portion connected to the first
fin with an adhesive having a heat conductivity.
Inventors: |
ANZAI; Hisao; (Kawasaki,
JP) |
Assignee: |
FUJITSU LIMITED
Kawasaki-shi
JP
|
Family ID: |
44186032 |
Appl. No.: |
12/967249 |
Filed: |
December 14, 2010 |
Current U.S.
Class: |
165/104.26 |
Current CPC
Class: |
F28D 15/0275 20130101;
H01L 23/427 20130101; H01L 23/467 20130101; H01L 2924/00 20130101;
H01L 2924/0002 20130101; H01L 23/3672 20130101; H01L 2924/0002
20130101; F28F 1/32 20130101 |
Class at
Publication: |
165/104.26 |
International
Class: |
F28D 15/04 20060101
F28D015/04 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 29, 2009 |
JP |
2009-299030 |
Claims
1. A heat sink comprising: a base; a first fin provided on the base
and including a first cutout portion; a first heat pipe including a
first linear portion and a first curved portion, the first curved
portion being provided in the first cutout portion; and a second
heat pipe including a second linear portion connected to the first
fin with an adhesive having a heat conductivity.
2. The heat sink according to claim 1, wherein the adhesive is made
of a solder member.
3. The heat sink according to claim 1, wherein the first curved
portion is curved with respect to the first fin.
4. The heat sink according to claim 1, further comprising: a second
fin provided on the base and including a second cutout portion,
wherein the second heat pipe further includes a second curved
portion provided in the second cutout portion, and the first linear
portion is connected to the second fin with an adhesive having a
heat conductivity.
5. The heat sink according to claim 4, wherein the second curved
portion is curved with respect to the second fin.
6. The heat sink according to claim 1, wherein the first fin
includes a hole portion in which the second linear portion is
inserted.
7. The heat sink according to claim 4, wherein the first linear
portion extends from the first curved portion toward the second
fin, the second linear portion extends from the second curved
portion toward the first fin, and the first curved portion faces
the second curved portion.
8. The heat sink according to claim 1, wherein the first cutout
portion is inclined with respect to the base.
9. The heat sink according to claim 4, wherein the second cutout
portion is inclined with respect to the base.
10. A heat sink comprising: a base; a plurality of fins provided on
the base and including a first fin and a second fin, the first fin
including a first cutout portion, the second fin including a second
cutout portion; a first heat pipe including a first curved portion
and a first linear portion extending from the first curved portion,
the first curved portion being provided in the first cutout
portion, the first linear portion being connected to the second
fin, and a second heat pipe including a second curved portion and a
second linear portion extending from the second curved portion, the
second curved portion being provided in the second cutout portion,
the second linear portion being connected to the first fin.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is based upon and claims the benefit of
priority of the prior Japanese Patent Application No. 2009-299030,
filed on Dec. 29, 2009, the entire contents of which are
incorporated herein by reference.
FIELD
[0002] The embodiments discussed herein are related to a heat
sink.
BACKGROUND
[0003] A heat source, such as a central processing unit (CPU) or a
switching device, of a product diffuses heat, and a heat sink is
known, which releases such diffused heat to the outside.
[0004] In cases where the product is provided with the heat sink,
the heat sink may be often disposed in a limited space.
Accordingly, in order to improve efficiency of heat release in the
limited space, various approaches have been made.
[0005] As one of the approaches, the heat sink may have a heat pipe
that is provided to efficiently transfer heat to a fin.
[0006] FIG. 7 illustrates a heat sink that is provided with heat
pipes. FIG. 8 illustrates a manner in which the heat pipes are
provided. FIG. 9 is an exploded view illustrating the heat sink
with which the heat pipes are provided.
[0007] A heat sink 90 has a heat receiving plate 91 and a plurality
of fins 92a and 92b which are disposed on the heat receiving plate
91 so as to be spaced apart from each other at a predetermined
distance.
[0008] Two U-shaped heat pipes 93 and 94 are inserted into the
plurality of the fins 92a and 92b from the front side toward the
rear side of FIG. 7 so as to be tilted at a predetermined angle as
illustrated in FIG. 8. In such an inserted state, the heat pipes 93
and 94 are disposed so as to be entirely covered with the plurality
of the fins 92a and 92b.
[0009] The heat pipes 93 and 94 are provided, so that heat from the
heat receiving plate 91 is also capable of being transferred to
each of the fins 92a and 92b at a portion departing from the heat
receiving plate 91, thereby improving the efficiency of heat
release.
[0010] Each of the heat pipes 93 and 94 has a fine structure
therein. Accordingly, for example, in cases where each of the heat
pipes 93 and 94 has a diameter of .phi. 6 mm, a curvature radius of
a curved portion of each of the heat pipes 93 and 94 is at most 15
mm.
[0011] As illustrated in FIGS. 7 and 9, in the heat sink 90, the
fins 92a which cover the curved portions of the heat pipes 93 and
94 individually have cutout portions 95 and 96 corresponding to the
shapes of the curved portions. Accordingly, the heat pipes 93 and
94 are capable of being entirely disposed inside an assembly of the
fins 92a and 92b. The fins are also provided so as to cover the
curved portions, and such a configuration enables heat, which is
transferred from the heat receiving plate 91 in this region, to be
released.
[0012] For example, such techniques related to the existing art are
disclosed in Japanese Laid-open Patent Publication Nos. 11-145354
and 2004-273632.
[0013] In the disclosed techniques, the cutout portions are not in
contact with the curved portions of the heat pipes. Accordingly, in
the fins having the cutout portions, areas in which the fins
contact the heat pipes are reduced. Consequently, such fins have a
problem in which the efficiency of the heat release is decreased
relative to the fins not having cutout portions.
SUMMARY
[0014] According to an aspect of the invention, a heat sink
includes a base, a first fin provided on the base and including a
first cutout portion, a first heat pipe including a first linear
portion and a first curved portion, the first curved portion being
provided in the first cutout portion, and a second heat pipe
including a second linear portion connected to the first fin with
an adhesive having a heat conductivity.
[0015] The object and advantages of the invention will be realized
and attained by means of the elements and combinations particularly
pointed out in the claims.
[0016] It is to be understood that both the foregoing general
description and the following detailed description are exemplary
and explanatory and are not restrictive of the invention, as
claimed.
BRIEF DESCRIPTION OF DRAWINGS
[0017] FIG. 1 is a perspective view illustrating a heat sink
according to a first embodiment.
[0018] FIG. 2 illustrates the configuration of a heat sink.
[0019] FIG. 3 illustrates a positional relationship between heat
pipes.
[0020] FIG. 4 illustrates a modification of the heat sink.
[0021] FIG. 5 illustrates another modification of the heat
sink.
[0022] FIG. 6 illustrates a heat sink according to a second
embodiment.
[0023] FIG. 7 illustrates a heat sink that is provided with heat
pipes.
[0024] FIG. 8 illustrates a manner in which the heat pipes are
provided.
[0025] FIG. 9 is an exploded view illustrating the heat sink with
which the heat pipes are provided.
DESCRIPTION OF EMBODIMENTS
[0026] A heat sink according to the embodiments will be described
with reference to the accompanying drawings.
First Embodiment
[0027] FIG. 1 is a perspective view illustrating a heat sink
according to a first embodiment.
[0028] A heat sink (radiator) 1 according to the embodiment has a
base substrate (heat receiving plate) 2, fin unit 3, and heat pipes
4a and 4b.
[0029] The base substrate 2 has a rectangular shape.
[0030] Two grooves 21 and 22 are formed on the base substrate 2 in
parallel with a side 2a of the base substrate 2 so as to be spaced
apart from each other at a predetermined distance. The heat pipe 4a
partially contacts the groove 21 through solder. The heat pipe 4b
partially contacts the groove 22 through solder.
[0031] The base substrate 2 contacts a heat source (not
illustrated) through a thermally conductive member, such as grease,
on the opposite side of the side on which the fin unit 3 is
disposed.
[0032] Examples of the heat source include a semiconductor chip of
a CPU or the like, a switching device, a resistance device, and a
semiconductor package or the like having these components.
[0033] Examples of the material of the base substrate 2 include
copper and aluminum.
[0034] A heat pipe (being different from the heat pipes 4a and 4b)
that serves for heat diffusion may be embedded in the base
substrate 2.
[0035] The fin unit 3 is disposed on the base substrate 2 through
solder or the like.
[0036] The fin unit 3 includes a plurality of fins 3a and 3b. Each
of the fins 3a and 3b has a plate shape. The plurality of the fins
3a and 3b are vertically arranged on the base substrate 2. Each of
the fins 3a and 3b is regularly arranged from a side 2b (front
side) in a direction (to a rear side) indicated by an arrow that is
parallel to the side 2a. The fins 3a are disposed on the front side
and the rear side of the base substrate 2 respectively. The fins 3b
are disposed between the fins 3a disposed on the front side and the
fins 3b disposed on the rear side.
[0037] Each of the fins 3a and 3b is provided so as to be spaced
from other fins 3a and 3b at a predetermined distance.
[0038] Examples of the materials of the fins 3a and 3b include
copper and aluminum.
[0039] For example, although not illustrated in FIG. 1, each of the
fins 3a and 3b may be provided with a connecting portion that is
used to connect one of the fins 3a and 3b to other fins 3a and 3b.
Each of the fins 3a and 3b may be connected to other fins 3a and 3b
through the connecting portion.
[0040] The heat pipes 4a and 4b are disposed inside the fin unit
3.
[0041] Each of the heat pipes 4a and 4b has a U-shaped body made of
a metal such as copper or the like. The body is provided in the
form of a tube. Ends of the U-shaped body are closed, and the
inside thereof is airproofed. A wick having porous substances and
fine grooves are provided on the inner wall of the body.
[0042] A small amount of a liquid (operating fluid) is enclosed in
the body. Examples of the operating fluid include pure water,
ammonia, and alternatives for chlorofluorocarbon or the like.
[0043] FIG. 2 illustrates the configuration of the heat sink.
[0044] Viewed from a front side to a rear side (in a front view),
the heat pipe 4a is disposed so as to be inclined to the left at a
predetermined angle with respect to a direction vertical to the
base substrate 2. In a front view, the heat pipe 4b is disposed so
as to be inclined to the right at a predetermined angle with
respect to a direction vertical to the base substrate 2.
[0045] With reference to FIG. 2, the fin unit 3 is capable of being
roughly divided into three assemblies including an assembly of the
fins 3a, an assembly of the fins 3b and an assembly of the fins 3a
on the basis of forms thereof.
[0046] An assembly 51 that is illustrated on the left side of FIG.
2 is formed by assembling a plurality of the fins 3a from the front
side to the rear side in a predetermined number, the fins 3a each
having the same shape.
[0047] The assembly 51 is formed by collectively assembling the
fins 3a, and a curved portion 42 of the heat pipe 4b is positioned
inside the assembly 51 in such an assembled state.
[0048] Each of the fins 3a of the assembly 51 has a circular hole
(through-hole) 31, a concavity to form a semi-circular groove 32,
and a cutout portion 33 corresponding to the curved portion 42 of
the heat pipe 4b. A linear portion 43 of the heat pipe 4a is
inserted into the hole 31 and passes thorough the same. A linear
portion 45 of the heat pipe 4a is inserted into the groove 32 and
passes through the same.
[0049] An assembly 52 that is illustrated on the right side of FIG.
2 is formed by assembling a plurality of the fins 3a from the most
rear side to the front side in a predetermined number, the fins 3a
each having the same shape.
[0050] The assembly 52 is formed by assembling the fins 3a, and a
curved portion 41 of the heat pipe 4a is positioned inside the
assembly 52 in such an assembled state.
[0051] Each of the fins 3a of the assembly 52 has the hole 31, a
concavity to form the groove 32, and the cutout portion 33
corresponding to the curved portion 41 of the heat pipe 4a. A
linear portion 44 of the heat pipe 4b is inserted into the hole 31
and passes thorough the same. A linear portion 46 of the heat pipe
4b is inserted into the groove 32 and passes through the same.
[0052] The number of the fins 3a which are provided with the cutout
portions 33 is determined on the basis of the curvature radius of
the curved portion 41. For example, in cases where the heat pipes
4a and 4b each have a diameter of .phi. 6 mm, curvature radiuses of
the respective curved portions 41 and 42 are approximately 15
mm.
[0053] The cutout portions 33 are provided, so that the heat pipes
4a and 4b are entirely positioned inside the fin unit 3. Each of
the cutout potions 33 has the same shape.
[0054] An assembly 53 is formed by assembling a plurality of the
fins 3b which are not used for the assemblies 51 and 52. The
assembly 53 is formed by assembling the fins 3b, and the linear
portions 43 and 45 of the heat pipe 4a and the linear portions 44
and 46 of the heat pipe 4b are positioned inside the assembly 53 in
such an assembled state.
[0055] Each of the fins 3a of the assembly 51 has a hole 31 and a
concavity to form a groove 32. Each of the fins 3a of the assembly
52 has a hole 31 and a concavity to form a groove 32. The linear
portion 43 of the heat pipe 4a penetrates the holes 31 of the
assembly 53 and the holes 31 of the assembly 51. The linear portion
44 of the heat pipe 4b penetrates the holes 31 of the assembly 53
and the holes 31 of the assembly 52. The linear portion 45 of the
heat pipe 4a penetrates the grooves 32 of the assembly 53 and the
grooves 32 of the assembly 51. The linear potion 46 of the heat
pipe 4b penetrates the grooves 32 of the assembly 53 and the
grooves 32 of the assembly 52.
[0056] In the heat sink 1 having such a configuration, the linear
portions 44 and 46 of the heat pipe 4b contact the fins 3a of the
assembly 52. Furthermore, the ends of the linear portions 44 and 46
of the heat pipe 4b contact the fin 3a of the assembly 52 that is
positioned closest to the rear. The ends of the heat pipe 4b are
provided so as to be visible from the outside.
[0057] Furthermore, the linear portions 43 and 45 of the heat pipe
4a contact the fins 3a of the assembly 51. Moreover, the ends of
the linear portions 43 and 45 of the heat pipe 4a contact the fin
3a of the assembly 51 that is positioned closest to the front. The
ends of the heat pipe 4a are provided so as to be visible from the
outside.
[0058] FIG. 3 illustrates a positional relationship between the
heat pipes.
[0059] In FIG. 3, illustration of the components other than the
heat pipes 4a and 4b is omitted.
[0060] FIG. 3 illustrates a positional relationship between the
heat pipes 4a and 4b in a state in which the heat pipes 4a and 4b
are inserted into the fin unit 3.
[0061] The heat pipes 4a and 4b are disposed by being inserted into
the fin unit 3 from opposite ends in a manner in which the
respective curved portions 41 and 42 intersect in a planar view.
Namely, the heat pipe 4a is disposed by being inserted from the
rear side to the front side in FIG. 1 such that the linear portions
of the heat pipe 4a are inserted in a direction orthogonally
intersecting the planar surfaces of the fins 3a or 3b (in a
vertical direction). On the other hand, the heat pipe 4b is
disposed by being inserted from the front side to the rear side in
FIG. 1 such that the linear portions of the heat pipe 4a are
inserted in a direction orthogonally intersecting the planar
surfaces of the fins 3a or 3b (in a vertical direction).
[0062] The heat pipes 4a and 4b are disposed such that the
respective curved portions 41 and 42 face each other.
[0063] A mechanism of the heat release in the heat sink 1 will be
described.
[0064] In cases where the heat sink 1 is used, the heat sink 1 is
placed such that the approximate center of the base substrate 2
contacts a heat source.
[0065] First, heat generated from the heat source is transferred to
the base substrate 2.
[0066] Part of the heat that has been transferred to the base
substrate 2 is transferred from the grooves 21 and 22 to the linear
portions 45 and 46 of the heat pipes 4a and 4b, respectively. In
addition, another part of the heat is directly transferred to the
fins 3a and 3b.
[0067] In cases where the heat is transferred to the operating
fluid of each of the heat pipes 4a and 4b, the temperature of the
operating fluid is increased with the result that the operating
fluid is evaporated. Steam generated by the evaporation moves
through the curved portions 41 and 42 of the heat pipes 4a and 4b
and moves to the linear portions 43 and 44, respectively.
[0068] The moved steam is cooled by the fins 3a and 3b to be
liquidized. Specifically, the linear portion 43 of the heat pipe 4a
is disposed in the hole 31 provided on each of the fins 3a of the
assembly 51, and therefore the steam that has been moved to the
linear portion 43 is cooled by transferring the heat from the hole
31 to each of the fins 3a of the assembly 51, thereby being
liquidized.
[0069] The linear portion 44 of the heat pipe 4b is disposed in the
hole 31 provided on each of the fins 3a of the assembly 52, and
therefore the steam that has been moved to the linear portion 44 is
cooled by transferring the heat from the hole 31 to each of the
fins 3a of the assembly 52, thereby being liquidized.
[0070] The operating fluid which is reproduced by liquidizing the
steam travels on the inner walls of the heat pipes 4a and 4b and
returns to each of the linear portions 45 and 46 by capillary
action.
[0071] A method of manufacturing the heat sink 1 will be
described.
[0072] First, the substrate 2 on which the grooves 21 and 22 are
formed is prepared.
[0073] The fins 3a and 3b are connected to each other using the
above described connecting portions or the like, thereby producing
the fin unit 3.
[0074] The fin unit 3 is placed on the base substrate 2 such that
the groove 32 and the cutout portion 33 of the fin unit 3 are
respectively aligned with the grooves 21 and 22 of the base
substrate 2.
[0075] Cream-like solder is applied on the heat pipes 4a and 4b,
and then the heat pipes 4a and 4b are inserted into the fin unit
3.
[0076] By virtue of this configuration, the linear portion 45 of
the heat pipe 4a is disposed along the groove 21. In addition, the
linear portion 46 of the heat pipe 4b is disposed along the groove
22.
[0077] Then, the resultant product is placed in a furnace to melt
the cream-like solder. The solder is subsequently cured, thereby
fixing the fin unit 3 and the heat pipes 4a and 4b to the base
substrate 2.
[0078] With these processes, the heat sink 1 is capable of being
manufactured.
[0079] As described above, the heat sink 1 has a configuration in
which the linear portion 44 (43) of the heat pipe 4b (4a) contacts
the fins 3a of the assembly 52 corresponding to the curved portion
41 (42) of the heat pipe 4a (4b).
[0080] Specifically, in manufacturing, the linear portion 43 of the
heat pipe 4a is inserted in a direction opposite to a direction in
which the linear portion 44 of the heat pipe 4b is inserted.
[0081] Accordingly, the total area of the fins 3a that contacts the
heat pipes 4a and 4b is increased. Consequently, in the heat sink 1
having a configuration in which the heat pipes 4a and 4b are
embedded in the fin unit 3, the efficiency of heat release is
capable of being improved.
[0082] For example, in a configuration of a heat sink 90
illustrated in FIG. 7, heat pipes 93 and 94 are provided so as to
be tilted at a predetermined angle. Therefore, a region that is
positioned between cutout positions 95 and 96 of fin 92a has a
configuration in which such a region poorly receives heat from
another region owing to the presence of the cutout portions 95 and
96. Accordingly, an inverted triangular portion that is positioned
at the center of the fin 2 becomes a dead space that does not
contribute to heat release.
[0083] However, in cases where the inclined angle of each of the
heat pipes with respect to the base substrate is increased in order
to decrease the area of the region that is disposed between the
cutout portions, the heat is not transferred to the entire fin 92a,
resulting in decreased efficiency of heat release.
[0084] On the other hand, in the heat sink 1, the cutout portion 33
of each of the fins 3a does not form the region to be interposed.
Accordingly, the decrease in the efficiency of heat release is
capable of being suppressed.
[0085] The heat pipes 4a and 4b are disposed so as to intersect
each other, so that heat pipes each having a larger curvature
radius are disposed, relative to the case in which the heat pipes
are disposed so as not to intersect each other. Accordingly, the
efficiency of heat release is further increased.
[0086] First Modification
[0087] FIG. 4 illustrates a modification of the heat sink.
Description the same as that of the heat sink 1 will be
omitted.
[0088] In the heat sink 1, the heat pipes 4a and 4b are disposed so
as to be tilted at a predetermined angle with respect to a
direction vertical to the base substrate 2.
[0089] However, in a heat sink is illustrated in FIG. 4, the heat
pipes 4a and 4b are vertically disposed with respect to the base
substrate 2.
[0090] For example, in cases where each of the heat pipes 4a and 4b
has a diameter of .phi. 6 mm, curvature radiuses of the respective
curved portions 41 and 42 are approximately 15 mm.
[0091] The heat sink is having such a configuration also provides
an advantage in which the performance of the heat release is
capable of being improved in each of the fins 3a at a position at
which the cutout position 33 is formed.
[0092] Second Modification
[0093] FIG. 5 illustrates a modification of the heat sink.
Description the same as that of the heat sink 1 will be
omitted.
[0094] In the embodiment described above, the heat pipes 4a and 4b
are inserted from opposite ends and are disposed so as to intersect
each other in planar view.
[0095] However, in a heat sink 1b illustrated in FIG. 5, the heat
pipes 4a and 4b are inserted from opposite ends and are disposed
while so as to be tilted at a predetermined angle without
intersecting each other.
[0096] For example, in cases where each of the heat pipes 4a and 4b
has a diameter of .phi. 6 mm, curvature radiuses of the respective
curved portions 41 and 42 are approximately 15 mm.
[0097] The heat sink 1b having such a configuration also provides
an advantage that the performance of the heat release is capable of
being improved in each of the fins 3a at a position at which the
cutout position 33 is formed. Furthermore, the heat sink 1b
provides an advantage that the efficiency of the heat release in
each of the fins 3a is capable of being improved relative to the
heat sink 1a.
[0098] A heat sink according to a second embodiment will be
hereinafter described.
Second Embodiment
[0099] The heat sink according to the second embodiment will be
described on the basis of differences between the first embodiment
and the second embodiment, and description the same as that of the
first embodiment will be omitted.
[0100] FIG. 6 illustrates a heat sink is according to the second
embodiment.
[0101] In the heat sink 1c, three heat pipes 4a, 4b, and 4c are
disposed so as to be covered with the fins 3a and 3b.
[0102] Although the positional relationship between the heat pipes
4a and 4b is the same as that of the heat sink is of the first
embodiment, the heat pipes 4a and 4b are disposed on the right side
within the heat sink 1a.
[0103] The heat pipe 4c is disposed to the left of the heat pipes
4a and 4b so as to be tilted to the left at a predetermined angle
with respect to a direction vertical to the base substrate 2.
[0104] The heat pipe 4c has a shape the same as those of the heat
pipes 4a and 4b.
[0105] The heat pipe 4c is disposed by inserting ends thereof into
the fin unit 3 from the front side in FIG. 6 to the rear side.
[0106] Each of the fins 3a of the assembly 51 according to the
embodiment has the hole 31, a concavity to form the groove 32, the
cutout portion 33, and a cutout portion 34. The linear portion 43
of the heat pipe 4a penetrates the hole 31. The linear portion 45
of the heat pipe 4a penetrates the groove 32. The cutout portion 33
accommodates the curved portion 42 of the heat pipe 4b. The cutout
portion 34 accommodates the curved portion 47 of the heat pipe
4c.
[0107] Each of the fins 3a of the assembly 52 according to the
embodiment has the hole 31, a concavity to form the groove 32, the
cutout portion 33, and another hole (not illustrated). The linear
portion 44 of the heat pipe 4b penetrates the hole 31. The linear
portion 46 of the heat pipe 4b penetrates the groove 32. The cutout
portion 33 accommodates the curved portion 41 of the heat pipe 4a.
The linear portion of the heat pipe 4c penetrates another hole,
described above.
[0108] Each of the fins 3b of the assembly 53 has the two holes 31
and another hole (not illustrated). The respective linear portions
43 and 44 of the heat pipes 4a and 4b penetrates the two holes 31.
The linear portion of the heat pipe 4c penetrates another hole,
described above.
[0109] In the heat sink 1c, the linear portion 43 of the heat pipe
4a is disposed in a region positioned between the heat pipes 4b and
4c in each of the fins 3a.
[0110] Accordingly, heat is transferred from the linear portion 43
to an inverted triangular portion that is formed through being
sectioned by the cutout portions 33 and 34 of each of the fins 3a,
so that a dead space is not generated, thereby being able to
suppress the decrease in the efficiency of heat release.
[0111] The heat sink is of the second embodiment is capable of
providing an advantage the same as that of the heat sink 1 of the
first embodiment.
[0112] The heat sink is of the second embodiment is capable of
further improving the efficiency of heat release.
[0113] Although a heat sink according to embodiments of the
invention has been described on the basis of the above embodiments
with reference to the accompanying drawings, embodiments of the
invention are not limited to the above embodiments. The
configuration of each component is capable of being appropriately
replaced by another configuration having a function the same as
that of each of the above embodiments. In addition, other objects
and operations may be appropriately added to embodiments of the
invention.
[0114] Furthermore, embodiments of the invention may be provided by
appropriately combining two or more configurations
(characteristics) of the above described embodiments.
[0115] All examples and conditional language recited herein are
intended for pedagogical purposes to aid the reader in
understanding the principles of the invention and the concepts
contributed by the inventor to furthering the art, and are to be
construed as being without limitation to such specifically recited
examples and conditions, nor does the organization of such examples
in the specification relate to a showing of the superiority and
inferiority of the invention. Although the embodiments of the
present inventions have been described in detail, it should be
understood that the various changes, substitutions, and alterations
could be made hereto without departing from the spirit and scope of
the invention.
* * * * *