U.S. patent application number 12/863913 was filed with the patent office on 2011-07-14 for corrugated-fin type radiator.
This patent application is currently assigned to MIZUTANI ELECTRIC IND. CO., LTD.. Invention is credited to Takumi Koyama, Mitsuya Miyamoto, Fumio Mutou, Yousuke Watanabe, Tadashi Yoshimura.
Application Number | 20110168374 12/863913 |
Document ID | / |
Family ID | 40901126 |
Filed Date | 2011-07-14 |
United States Patent
Application |
20110168374 |
Kind Code |
A1 |
Watanabe; Yousuke ; et
al. |
July 14, 2011 |
CORRUGATED-FIN TYPE RADIATOR
Abstract
Disclosed is a corrugated-fin type radiator (1), which comprises
corrugated fins (10), and a support substrate (20) having a
plurality of fixing grooves (23) defined by side walls (24) and a
bottom (25). The bottom (25) has a ridge (26) at least in its
portion, and the side walls (24) are formed of a vertical wall
(24a), a tapered wall (24b) and a corner (24c). A fin fixing
portion (14) is fixed along the side walls (24) and the bottom (25)
of the fixing grooves (23). Also disclosed is a method for
manufacturing the corrugated-fin type radiator (1), which comprises
a substrate manufacturing step, a fin shaping step and a fixing
step. Thus, it is possible to provide the corrugated-fin type
radiator capable of improving a radiation efficiency, and a method
for manufacturing the radiator.
Inventors: |
Watanabe; Yousuke;
(Shizuoka, JP) ; Mutou; Fumio; (Tokyo, JP)
; Koyama; Takumi; (Shizuoka, JP) ; Yoshimura;
Tadashi; (Shizuoka, JP) ; Miyamoto; Mitsuya;
(Shizuoka, JP) |
Assignee: |
MIZUTANI ELECTRIC IND. CO.,
LTD.
Chiyoda-ku, Tokyo
JP
|
Family ID: |
40901126 |
Appl. No.: |
12/863913 |
Filed: |
January 21, 2009 |
PCT Filed: |
January 21, 2009 |
PCT NO: |
PCT/JP2009/050893 |
371 Date: |
December 20, 2010 |
Current U.S.
Class: |
165/185 ;
29/890.03 |
Current CPC
Class: |
H01L 2924/0002 20130101;
H05K 7/20418 20130101; H01L 2924/00 20130101; H01L 21/4882
20130101; H01L 23/3672 20130101; H01L 2924/0002 20130101; Y10T
29/4935 20150115 |
Class at
Publication: |
165/185 ;
29/890.03 |
International
Class: |
F28F 7/00 20060101
F28F007/00; B21D 53/02 20060101 B21D053/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 21, 2008 |
JP |
2008-000261U |
Claims
1. A corrugated-fin type radiator, comprising: corrugated fins that
radiate heat; and a support substrate having a plurality of fixing
grooves including side walls and a bottom for fixing a part of the
corrugated fins; wherein the bottom has a ridge on at least a part
thereof, which is higher than the bottom and is formed in parallel
to the bottom, and the side walls have vertical walls extending
downward from the support substrate in a vertical direction,
tapered walls extending from the vertical walls toward the bottom
with increase in a distance between the tapered walls, and corners
having a curved surface formed contiguously from the tapered walls
to the bottom, and wherein a part of the corrugated fin is fixed
along the shape of the side wall and the bottom of the fixing
groove.
2. The corrugated-fin type radiator according to claim 1, wherein:
a length of the vertical wall is greater than or equal to one sixth
and smaller than or equal to one half of a length of the side
wall.
3. The corrugated-fin type radiator according to claim 1, wherein:
a height of the ridge is greater than or equal to one tenth and
smaller than or equal to two thirds of a height of the fixing
groove, a width of a lower end portion of the ridge is greater than
or equal to one tenth and smaller than or equal to five sixths of a
width of the fixing groove, a width of a upper end portion of the
ridge is greater than or equal to one eighth and smaller than or
equal to four fifths of a width of the lower end portion of the
ridge, and a width of the upper end portion is smaller than or
equal to the width of the lower end portion.
4. The corrugated-fin type radiator according to claim 1, wherein:
a radius of the corner is greater than or equal to one sixteenth
and smaller than or equal to one third of a width of the fixing
groove.
5. The corrugated-fin type radiator according to claim 3, wherein:
a radius of the corner is greater than or equal to one sixteenth
and smaller than or equal to one third of a width of the fixing
groove.
6. A method of producing the corrugated-fin type radiator of claim
1, comprising: a substrate manufacturing step of extruding or
cutting the support substrate, forming the plurality of fixing
grooves which is formed of, the side wall having the tapered wall
and the corner, and of the bottom, and forming the ridge on the
bottom; a fin shaping step of producing a corrugated fin by folding
a metal plate to form a plurality of fin bottoms which form a lower
end of the corrugated fin and are substantially parallel to the
support substrate, a plurality of fin top portions which form an
upper end of the corrugated fin and are substantially parallel to
the support substrate, and a plurality of jointing portions which
joint the fin bottom and the fin top portion and which are
substantially perpendicular to the support substrate, so that the
fin bottoms and the fin top portions are arranged one after the
other, and so that the distance between external walls of the
neighboring jointing portions is approximately equal or somewhat
smaller than the opening width of the fixing groove; and a fixing
step of fixing the corrugated fin on the support substrate by,
inserting the fin fixing portion, which is formed of the fin bottom
and a lower end of the jointing portion, into the fixing groove
from the opening, fitting the fin fixing portion onto the ridge,
and pressing the fin bottom toward the ridge from the gap of the
jointing portion using the top of a press tool having a concave
portion on top thereof, and deforming the fin fixing portion along
the shape of the fixing groove, thereby the corrugated fin being
fixed on the support substrate.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a radiator for cooling, for
example, a semiconductor element such as a transistor, an LSI, and
a microprocessor, that generates heat during operation, and in
particular to a corrugated-fin type radiator including corrugated
fins.
[0003] 2. Description of the Related Art
[0004] There are various types of radiators in general for cooling
a semiconductor element. A corrugated-fin type radiator is known,
in which corrugated fins are disposed on the support substrate on
which a semiconductor element is mounted, thereby expanding the
radiation area and improving the cooling effect.
[0005] A conventional corrugated-fin type radiator is, for example,
disclosed in JP3602806. Hereinafter such a conventional
corrugated-fin type radiator will be explained with reference to
FIGS. 4A to 4B. FIG. 4A shows a structure in which a conventional
corrugated-fin type radiator having a fin fixing portion of the
corrugated-fin is fixed on a fixing groove. FIG. 4B is a partially
enlarged sectional view of the fixing groove and its vicinity on
which the fin fixing portion is fixed. As shown in FIG. 4A, a
conventional corrugated-fin type radiator 100 is mainly formed of a
corrugated fin 110 and a support substrate 120 with a plurality of
fin-fixing grooves 123. The fin-fixing groove 123 includes a flat
bottom 125, tapered walls 124 spreading from an opening side, and
corners 127 with a curved surface between the tapered wall 124 and
the bottom 125. A corrugated fin fixing portion 114 of the
corrugated fin 110 includes a projecting portion 111 which is a
lower end part of 114 projecting toward the fin-fixing groove 123,
and is so formed as to have the width smaller than the minimum
width of the opening side of the fin-fixing groove 123.
[0006] By pressing the corrugated fin fixing portion 114 toward the
fin-fixing groove 123 with a press fitting blade 132 which has a
flat lower end, the projecting portion 111 is deformed and is
pressure-bonded along the shape of the fin-fixing groove 123,
thereby the corrugated fin fixing portion 114 being fixed in the
fin-fixing groove 123.
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0007] However, the corrugated-fin type radiator 100 described
above still have a room for improvement. In the technical field of
radiators, it is required to improve radiation efficiencies. For
this purpose, an important issue is to increase the contact area
and adhesion force between corrugated fins and a support
substrate.
[0008] In light of this background, a conventional corrugated-fin
type radiator 100, as shown in FIG. 4B, gaps S may be formed
because the corrugated fin fixing portion 114 cannot be expanded to
corners 127 of the fin-fixing groove 123 with poor contact along
with the corners 127.
[0009] In addition, in the conventional corrugated-fin type
radiator 100, when the projecting portion 111 of the corrugated fin
fixing portion 114 is pressed with the press fitting blade 132 of
which lower end is flat, the projecting portion 111 is deformed and
spreads in a width direction of the fin-fixing groove 123, and when
it reaches the corner 127, then it is pressed up in a height
direction and deformed. Due to this deformation, a central part of
the corrugated fin fixing portion 114 might rise and gaps S might
be formed between the projecting portion 111 and the bottom 125 of
the fin-fixing groove 123.
[0010] Accordingly, it is desirable to provide a corrugated-fin
type radiator that can increase the contact area and adhesion force
between the corrugated fins and the support substrate, and thereby
improving the radiation efficiency.
Means for Solving the Problems
[0011] The present invention is a corrugated-fin type radiator
including: corrugated fins that radiate heat; and a support
substrate having a plurality of fixing grooves including side walls
and a bottom for fixing a part of the corrugated fins; wherein the
bottom has a ridge on at least a part thereof, which is higher than
the bottom and is formed in parallel to the bottom, and the side
walls have vertical walls extending downward from the support
substrate in a vertical direction, tapered walls extending from the
vertical walls toward the bottom with increase in a distance
between the tapered walls, and corners having a curved surface
formed contiguously from the tapered walls to the bottom, and
wherein a part of the corrugated fin is fixed along the shape of
the side wall and the bottom of the fixing groove.
[0012] According to the present invention, as the corrugated-fin
type radiator has a ridge at least in one part of the bottom, a
part of the corrugated fin is pressed by the ridge and is expanded
first along the shape of the ridge. Then it is expanded along the
shape of the bottom, and expanded to the side walls of the fixing
groove. Thus owing to the ridge, the contact area between the
corrugated fin and the support substrate can be increased. In
addition, due to the ridge, the deformation quantity of the
corrugated fin can be increased, thereby the pressing force applied
on the corrugated fin toward the corner and the side wall located
on both sides of the fixing groove are also increased. As a result,
a part of the corrugated fin can be fixed on the fixing groove
appropriately. Further, since the side wall of the fixing groove
has a vertical wall and a tapered wall, apart of the corrugated fin
can be fit and fixed into the fixing groove and a part of the
corrugated fin is appropriately attached to the side wall according
to the lateral-directional force between the adjacent corrugated
fins. In this way, fixing a part of the corrugated fin according to
the shape of the side wall and bottom of the fixing groove, the
contact area between the corrugated fin and the support substrate
is increased. Further, since the side wall has a corner with a
curved surface, a part of the corrugated fin, which is expanded
toward the corner, presses the corner, and the fixing strength of
the corrugated fin to the support substrate is improved.
[0013] Preferably, but not necessarily, the length of the vertical
wall is made greater than or equal to one sixth and smaller than or
equal to a half of the length of the side wall, the height of the
ridge is made greater than or equal to one tenth and smaller than
or equal to two thirds of the height of the fixing groove, the
width of the lower end part of the ridge is made greater than or
equal to one tenth and smaller than or equal to five sixths of the
width of the fixing groove, the width of the upper part of the
ridge is made greater than or equal to one eighth and smaller than
or equal to four fifths of the width of the lower end part of the
ridge, and the width of the upper end part is made smaller than or
equal to the width of the lower end part.
[0014] In this structure, a part of the corrugated fin can be
appropriately fixed in a shape in accordance with the side wall,
the bottom and corner, without applying an excessive force.
[0015] The radius of the corner is preferably, but not necessarily,
made to be greater than or equal to one sixteenth and smaller than
or equal to one third of the width of the fixing groove.
[0016] In this structure, a part of the corrugated fin can be fixed
on the corner more appropriately.
[0017] A manufacturing method according to an aspect of the present
invention is a method for manufacturing a corrugated-fin type
radiator described in claim 1, including a substrate manufacturing
step, a fin shaping step and a fixing step.
[0018] The method of producing a corrugated-fin type radiator
according to the present invention includes: a substrate
manufacturing step of extruding or cutting the support substrate,
forming the plurality of fixing grooves which is formed of, the
side wall having the tapered wall and the corner, and of the
bottom, and forming the ridge on the bottom; a fin shaping step of
producing a corrugated fin by folding a metal plate to form a
plurality of fin bottoms which form a lower end of the corrugated
fin and are substantially parallel to the support substrate, a
plurality of fin top portions which form an upper end of the
corrugated fin and are substantially parallel to the support
substrate, and a plurality of jointing portions which joint the fin
bottom and the fin top portion and which are substantially
perpendicular to the support substrate, so that the fin bottoms and
the fin top portions are arranged one after the other, and so that
the distance between external walls of the neighboring jointing
portions is approximately equal or somewhat smaller than the
opening width of the fixing groove; and a fixing step of fixing the
corrugated fin on the support substrate by, inserting the fin
fixing portion, which is formed of the fin bottom and a lower end
of the jointing portion, into the fixing groove from the opening,
fitting the fin fixing portion onto the ridge, and pressing the fin
bottom toward the ridge from the gap of the jointing portion using
the top of a press tool having a concave portion on top thereof,
and deforming the fin fixing portion along the shape of the fixing
groove, thereby the corrugated fin being fixed on the support
substrate.
Effect of the Invention
[0019] According to the present invention, the following effects
can be obtained. The corrugated-fin type radiator according to the
invention is capable of increasing the contact area between the
corrugated fin and the support substrate, and improving the heat
conduction efficiency between the support substrate and the
corrugated fin. Herewith the radiation efficiency of the
corrugated-fin type radiator is improved, and the fixing strength
of the corrugated fin to the support substrate is also
improved.
[0020] In addition, according to the method for manufacturing a
corrugated-fin type radiator of the present invention, the fin
fixing portion is deformed along the shape of the fixing groove,
thereby the contact area and the adhesion force between the
corrugated fin and the support substrate are increased, and
therefore the radiation characteristics of the corrugated-fin type
radiator can be improved. Further, the fixing strength of the
corrugated fin to the support substrate is also improved. In
addition, fitting and fixing the corrugated fin on the support
substrate can be performed without any special tools and the
component count of a radiator can be reduced which leads to the
cost reduction of the radiator.
[0021] The various aspects, other advantages and further features
of the present invention described above will become more apparent
by describing in detail illustrative, non-limiting embodiments
thereof with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG. 1A shows an entire block diagram of a corrugated-fin
type radiator in accordance with an embodiment of the present
invention;
[0023] FIG. 1B shows a partially enlarged perspective view of the
fixing groove shown in FIG. 1A;
[0024] FIG. 2 shows a partially enlarged sectional view of the
vicinity of the fixing groove shown in FIG. 1;
[0025] FIGS. 3A to 3C show explanatory diagrams for explaining how
corrugated fins are fixed to the fixing grooves;
[0026] FIG. 4A shows a conventional corrugated-fin type radiator
having the fin fixing portion of the corrugated fin fixed on the
fixing groove; and
[0027] FIG. 4B shows a partially enlarged sectional view of the
vicinity of the fixing groove with the fin fixing portion thereof
being fixed.
DESCRIPTION OF THE SYMBOLS
[0028] 1 corrugated-fin type radiator [0029] 10 corrugated fin
[0030] 11 fin bottom [0031] 12 fin top portion [0032] 13 jointing
portion [0033] 14 fin fixing portion [0034] 15 outermost fin bottom
[0035] 20 support substrate [0036] 21 upper surface [0037] 22 lower
surface [0038] 23 fixing groove [0039] 24 side wall [0040] 24a
vertical wall [0041] 24b tapered wall [0042] 24c corner [0043] 25
bottom [0044] 26 ridge [0045] 28 engaging portion [0046] 28a
engaging side wall [0047] 28b engaging bottom [0048] 29 clamping
portion [0049] 31, 32 press tool [0050] 31a concave portion
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0051] Hereinafter, preferred embodiments of a corrugated-fin type
radiator 1 according to the present invention will be described
with reference to the drawings.
[0052] As shown in FIG. 1A, a corrugated-fin type radiator 1
includes corrugated fins 10 for radiating heat, and a support
substrate 20 having a plurality of fixing grooves 23 thereon which
is formed of a side wall 24 and a bottom 25 for fixing a part of
the corrugated fin 10. The corrugated fin 10 and the support
substrate 20 are made of high thermal conductive materials such as
copper, copper alloy, Al alloy and the like.
[0053] The corrugated fin 10 includes, a fin bottom 11 which is
nearly parallel to the support substrate 20 and forms the lower end
of the corrugated fin, a fin top portion 12 which is nearly
parallel to the support substrate 20 and forms the upper end of the
corrugated fin 10, and a jointing portion 13 which is substantially
vertical to the support substrate 20 and couples the fin bottom 11
and the fin top portion 12. The fin bottoms 11 and the fin top
portions 12 are arranged one after the other.
[0054] The corrugated fin 10 can be shaped by folding a long metal
plate trough press forming. Meanwhile, in this embodiment, as shown
in FIG. 1A and FIG. 2, the corrugated fin 10 does not have a
jointing portion 13 at the outermost part thereof, and the
outermost fin bottom 15 is made shorter than other fin bottoms 11
(see FIG. 2).
[0055] In addition, there is no restriction in the height of the
jointing portion 13 of the corrugated fin 10 from the support
substrate 20 as long as it is high enough for obtaining the
radiation effect. Further, a width W1 of the corrugated fin 10 may
be smaller or greater than the width of support substrate 20, and
not restricted specifically. Still further, the thickness of the
corrugated fin 10 may be determined as appropriate in light of the
strength and so on.
[0056] According to this embodiment, in the corrugated fin 10, the
fin bottom 11 and the lower end of the jointing portion 13, 13,
which are contiguously formed from both ends of the fin bottom 11
in the longitudinal direction, are fixed along the shape of the
fixing groove 23. Hereinafter, this portion may be referred to as
"fin fixing portion" for convenience in the explanation. The fin
fixing portion 14 is formed so that the width of the fin fixing
portion 14 (see FIG. 2), that is the width between the external
walls of the jointing portion 13, is nearly equal to or slightly
smaller than the width of the opening of the fixing groove 23, that
is the width between the side walls 24, 24. Herewith, the fin
fixing portion 14 can be inserted smoothly into the fixing groove
23.
[0057] As shown in FIGS. 1A and 1B, the support substrate 20 acts
as a base of the corrugated-fin type radiator 1, and has a
plurality of fixing grooves 23 having a width and depth prescribed
for fixing the corrugated fin 10 on the upper surface 21. In
addition, the support substrate 20 abuts to a heat source such as a
semiconductor element (not shown), and conducts the heat from the
heating element to the corrugated fin 10.
[0058] As shown in FIG. 1B, the plurality of fixing grooves 23
having the side wall 24 and the bottom 25 are formed from the upper
surface 21 to the lower surface 22 on the support substrate 20.
[0059] The side wall 24 is formed of, a vertical wall 24a which
extends downward perpendicularly to the upper surface 21 of the
support substrate 20, a tapered wall 24b formed from the vertical
wall 24a toward the bottom 25 increasing in diameter, and a corner
24c having a curved surface formed contiguously from the lower end
portion of the tapered wall 24b.
[0060] It is preferable for a length L1 of the vertical wall 24a to
be greater than or equal to one sixth and smaller than or equal to
one half of a length L2 of the side wall 24. If the length L1 of
the vertical wall 24a is smaller than or equal to one sixth of a
length L2 of the side wall 24, it is not preferable because the
length L1 of the vertical wall 24a is too short and the fin fixing
portion 14 may not be closely contacted properly. Meanwhile, if the
length L1 of the vertical wall 24a is greater than or equal to one
half of a length L2 of the side wall 24, the angle made by the
tapered wall 24b and the corner 24c becomes too steep and the fin
fixing portion 14 may not be closely contacted properly, which is
not preferable either. Therefore, it is more preferable to set the
length L1 of the vertical wall 24a to be greater than or equal to
one fourth and smaller than or equal to one third of a length L2 of
the side wall 24.
[0061] It is preferable to form the corner 24c with a radius to be
greater than or equal to one sixteenth and smaller than or equal to
one third of the width of the fixing groove 23. If the radius of
the corner 24c is smaller than or equal to one sixteenth of the
width of the fixing groove 23, the angle of the corner 24c becomes
too steep and the fin fixing portion 14 may not be closely
contacted properly along the shape of the corner 24c. Meanwhile, if
a radius of the corner 24c is greater than or equal to one third of
the width W2 of the fixing groove 23, the angle of the corner 24c
becomes too large and the fixing strength may not be enough, which
is not preferable either. Therefore, it is more preferable to form
the vertical wall 24a with a radius to be greater than or equal to
one eighth and smaller than or equal to one fourth of the width W2
of the fixing groove 23.
[0062] The bottom 25 is formed as a flat surface nearly parallel to
the upper surface 21 of the support substrate 20, having a ridge 26
at least in one portion which is higher than the bottom 25 and is
parallel to the bottom 25.
[0063] In this embodiment, the ridge 26 is formed nearly in the
central region of the bottom 25. The ridge 26 is formed so that,
the height H2 from the fixing groove 23 is greater than or equal to
one tenth and smaller than or equal to two thirds of the height of
the fixing groove 23, the width W3 of the lower end portion is
greater than or equal to one tenth and smaller than or equal to
five sixths of the width W2 of the fixing groove 23, the width W4
of the upper end portion is greater than or equal to one eighth and
smaller than or equal to four fifths of the width W4 of the width
W3 of the lower end portion of the ridge 26, and the width W4 of
the upper end portion of the ridge 26 is smaller than or equal to
the width W3 of the lower end portion of the ridge 26. Herewith the
contact area between the fin fixing portion 14 and the fixing
groove 13 can be increased. Further, it is more preferable to set
the height H2 of the ridge 26 from the fixing groove 23 to be
greater than or equal to one fourth and smaller than or equal to
one half of the height of the fixing groove 23, the width W3 of the
lower end portion of the ridge 26 to be greater than or equal to
one fifth and smaller than or equal to one third of the width W2 of
the fixing groove 23, and the width W4 of the ridge 26 to be
greater than or equal to one third and smaller than or equal to one
half of the width W3 of the ridge 26.
[0064] The support substrate 20 is produced, for example, by
extruding or cutting one surface of a metal plate (the upper
surface 21 in the embodiment) and forming a plurality of fixing
groove 23.
[0065] In addition, an engaging portion 28 is formed on both ends
of the support substrate 20 for engaging an outermost fin bottom
15, which is located at outermost part of the corrugated fin 10,
with a jointing portion 13, which is formed contiguously to the
outermost fin bottom 15. The engaging portion 28 includes an
engaging side wall 28a which extends downward from the upper
surface 21 in a vertical direction, and an engaging bottom 28b
which is formed contiguously from the engaging side wall 28a and is
parallel to the support substrate 20. The width of the engaging
portion 28 is determined to be nearly equal to the distance between
the outer end of the outermost fin bottom 15 and the external wall
of the jointing portion 13.
[0066] Further, a clamping portion 29 is formed outside the
engaging portion 28. The clamping portion 29 is used for clamping
and fixing the outermost fin bottom 15 onto the engaging portion 28
by being crushed, and in this embodiment the clamping portion 29 is
formed to be a protrusion along the outer end portion of the
engaging bottom 28b of the engaging portion 28. It is preferable
that the height H3 of the clamping portion 29 is made lower than
the height of the engaging side wall 28a, that is the height H1 of
the fixing groove 23, so that, when clamping portion 29 is crushed
flatly, the top thereof may not get stuck on the engaging side wall
28a.
[0067] Next, a process in which the fin fixing portion 14 is fixed
onto the fixing groove 23 will be explained referring to FIGS. 3A
to 3C, and FIGS. 1 to 2 as appropriate. As shown in FIG. 3A, the
fin fixing portion 14 of the corrugated fin 10 is inserted from the
opening of the fixing groove 23 and fit and fixed onto the ridge
26. Then, as shown in FIG. 3B, the fin bottom 11 is pressed toward
the ridge 26 of the fixing groove 23 with the tip of a press tool
31 having a concave portion 31a. Thus, the fin bottom 11 is closely
contacted along the shape of the ridge 26, and spread widthwise in
the bottom 25 of the fixing groove 23 from the ridge 26, and
finally closely contacted along the shape of the corner 24c.
[0068] Owing to the side wall 24 of the fixing groove 23, having
the vertical wall 24a and the tapered wall 24b, when the fin fixing
portion 14 is fit and fixed onto the fixing groove 23, the fin
fixing portion 14, especially the jointing portion 13, 13 thereof
is in close contact with the side wall 24 according to the lateral
force between adjacent corrugated fins 20. In addition, the side
wall 24 having the corner 24c with a curve, can contact the fin
fixing portion 14 closely onto the corner 24c. Thus, as shown in
FIG. 3C, the fin fixing portion 14 is closely contacted and fixed
along the shape of the fixing groove 23.
[0069] At the same time, by fitting the outermost jointing portion
13 and the outermost fin bottom 15 into the engaging portion 28
(see FIG. 1B), and by pressing the clamping portion 29 with a press
tool 32 having a flat top toward an engaging bottom 28b (see FIG.
1B), the clamping portion 29 is crushed flatly according to the
shape of the press tool 32 and spreads over the outermost fin
bottom 15, and presses the outermost fin bottom 15 toward the
engaging bottom 28b (see FIG. 1B). Herewith, as shown in FIG. 3C,
the outermost fin bottom 15 and the jointing portion 13 are fixed
onto the engaging portion 28 (see FIG. 1B).
[0070] Thus, the corrugated fin 20 is fixed to the support
substrate 10. Meanwhile, it is preferable to make the concave
portion 31a of the press tool 31 have a width and depth suitable
for contacting the fin bottom 11 according to the shape of the
ridge 26, considering the width and height of the lower end portion
of the ridge 26 and the thickness of the fin bottom 11.
[0071] According to the corrugated-fin type radiator 1 in the
embodiment, by contacting the fin fixing portion 14 of the
corrugated fin 10 along the shape of the fixing groove 23 of the
support substrate 20, the contact area between the corrugated fin
10 and the support substrate 20 can be increased, and the heat
conduction effect from the support substrate 20 to the corrugated
fin 10 can be improved. As a result, the radiation efficiency of
the corrugated-fin type radiator 1 is improved. In addition, the
fixing strength of the corrugated fin 10 to the support substrate
20 is improved as well.
[0072] While the foregoing has described a corrugated-fin type
radiator according to the embodiment, a corrugated-fin type
radiator according to the present invention is not limited to the
embodiment, and various modifications thereto can be made without
departing from the spirit and scope of the invention
* * * * *