WO2007102710A1

WO2007102710A1 - Heat-sink device

Info

Publication number: WO2007102710A1
Application number: PCT/KR2007/001136
Authority: WO
Inventors: Hyun-Jong Kim
Original assignee: Hyun-Jong Kim
Priority date: 2006-03-08
Filing date: 2007-03-07
Publication date: 2007-09-13

Abstract

The present invention relates to a heat-sink device includes a heat-sink composed of a heat radiating plate in sheet-shape having a heat absorbing part contacting with a heat source and a heat radiating part integrally extended from both sides of the heat absorbing part, wherein the heat-sink is composed of first and second heat radiating units in which each heat radiating unit is formed by overlapping a plurality of the heat radiating plates in a sheet-shape, the heat absorbing part of the respective heat radiating plate is adhered closely to the neighboring heat absorbing part of the heat radiating plate and forms a central part which contacts with the heat source, and the heat radiating part of the respective heat radiating plate widens in all directions from the central part; each heat radiating unit is connected to each other in the shape of '+' at the central part to connect to the heat source respectively and the respective heat radiating unit widens from the central part in all directions to be a densely packed cylindrical shape. Therefore, a heat-sink device may increase the heat-radiating efficiency by minimizing the loss of cooling air as it has a cylindrical shape and extending a radiating area by dividing and cooling a heat transfer surface of a heat source with two radiating units.

Description

Description HEAT-SINK DEVICE

Technical Field

[1] The present invention relates to a heat-sink device, and more particularly, to a heat- sink device extending a radiating area by dividing and cooling a heat transfer surface of a heat source with two radiating units, as well as increasing the heat-radiating efficiency by minimizing the loss of cooling air as it has a cylindrical shape. Background Art

[2] A heat-sink is a cooling device which absorbs heat from electronic parts and elements and radiates the heat to outside.

[3] For example, a central processing unit (CPU), a graphic card and the like which necessarily generate heat while operating are mounted in a computer.

[4] These heat-generating parts generate a lot of heat when they are used and controlled. The performance and the life time of the heat-generating parts may be reduced if the heat lingers on them, and it even badly affects on the computer to stop operating. Therefore, the heat-sink device mounted on the heat-generating parts prevents the temperature of the heat-generating parts from rising to a certain level.

[5] Recently, the heat from the heat-generating parts increases as the performance of the computer is incredibly developing while the size of the electronic parts and the elements is gradually reducing.

[6] The heat-radiating amount increases in proportion to the size of the heat-sink, however, the increased size is not suitable for the recent miniaturization trend, and thus a manufacturing technology is proposed to expand the surface area of a radiation fin on the same size of heat-sink.

[7] For example, various heat-sink devices are proposed, wherein a heat absorbing part contacts the heat source being tightly adhered to the heat source and absorbs heat by overlapping a plurality of heat radiating plates in a sheet-shape, and a heat radiating part widened in a fan-shape has an increased radiating area.

[8] To maximize the heat-radiating efficiency of the conventional heat-sink device, the heat radiating plates should be evenly disposed on the upper part of the heat source without vacant space, the cooling air blown from a cooling fan should be largely guided into the direction of the heat source, and the cooling air should evenly passes through between the heat absorbing parts to exchange the heat.

[9] However, since the conventional heat-sink device uses a heat-sink in which a plurality of heat radiating plates are overlapped in one direction, there is a vacant space due to the degree restriction of the heat radiating part to widen. [10] Therefore, the conventional heat-sink device can not use the heat radiating space effectively, and the air blown from the cooling fan is mostly flown to the vacant space, which is relatively large, instead of the narrow space between the heat absorbing parts, and therefore the heat exchange is not performed well enough.

[11] Also, according to the conventional heat-sink device, because each heat radiating part is open to the outer circumference when the respective heat radiating part is separated to be a cylindrical shape, the air from the cooling fan which is mounted on the upper part of the heat-sink is not concentrated into the heat source but is blown into the outer circumference, thereby resulting in loss of cold air.

[12] Meanwhile, according to the prior art, a method is used in which a separate mounting bracket is mounted on the heat source and the heat-sink is screwed to the mounting bracket via a connecting hole arranged in the lower part of the heat-sink.

[13] However, the heat-sink mounting method according to the prior art has a drawback in that the installing and uninstalling the heat-sink is not easy and it takes long time to replace, because the heat-sink has a relatively large volume compared to the small space to install so the heat-sink has to be screwed through the narrow gap of the heat radiating part.

Disclosure of Invention Technical Problem

[14] The object of the present invention is to provide a heat-sink device including a heat- sink composed of more than two radiating units which is dividing and cooling a heat transfer surface of a heat source and has a cylindrical shape, thereby maximizing a radiating area against an absorbing area and increasing the heat-radiating efficiency.

[15] Another object of the present invention is to provide a heat-sink device capable of obtaining a gap between heat radiating parts arranged on a heat absorbing part and minimizing a vacant space between the heat radiating parts by reforming the shape of gaps between the heat radiating parts by use of a spacer and a pinch member.

[16] Another object of the present invention is to provide a heat-sink device capable of improving heat-radiating efficiency by preventing the cooling air from being discharged to the circumference of the heat-sink and concentrating the cooling air into a heat source.

[17] Another object of the present invention is to provide a heat-sink device capable to be installed and uninstalled with ease without being screwed through the narrow gap, since the heat-sink is rotationally installed. Technical Solution

[18] To accomplish the above-mentioned objects, a heat-sink device according to the present invention includes a heat-sink composed of a heat radiating plate in sheet- shape having a heat absorbing part contacting with a heat source and a heat radiating part integrally extended from both sides of the heat absorbing part, wherein the heat- sink is composed of first and second heat radiating units in which each heat radiating unit is formed by overlapping a plurality of the heat radiating plates in a sheet-shape, the heat absorbing part of the respective heat radiating plate is adhered closely to the neighboring heat absorbing part of the heat radiating plate and forms a central part which contacts with the heat source, and the heat radiating part of the respective heat radiating plate widens in all directions from the central part; each heat radiating unit is connected to each other in the shape of "+" in the central part and connected to the heat source respectively; the respective heat radiating unit widens from the central part in all directions to be a densely packed cylindrical shape.

[19] Here, the heat-sink device according to the present invention may further include an adherent member which is arranged on the central part of the first heat radiating unit and closely connects each heat absorbing part of the first heat radiating unit to both sides of the heat absorbing part disposed in the outmost end of the first radiating unit, and a joint maintaining the state that the adherent member closely adheres the respective heat absorbing part.

[20] The heat-sink device according to the present invention may further include a mounting unit having a first fixing member in a ring- shape which has an external thread on the outer circumference and is connected to the lower part of the adherent member; a bracket installed at a substrate on which the heat source is mounted and has a through hole so that the central part may penetrate the through hole and contact the heat source; and a second fixing member connected to the through hole and has an internal thread corresponding to the external thread; wherein the mounting unit is able to mount the heat-sink on the heat source by tooth-engaging the first fixing member with the second fixing member in a rotational fashion and by contacting the respective central part to the heat source.

[21] The heat-sink device according to the present invention may further include a supporting unit, wherein the supporting unit includes a supporting member surrounding the lower part of the central part, and in which a penetrating part is formed so that the lower part of the central part may penetrate the penetrating part and contact to the heat source; 4 supporting rods extended from the supporting member to the upper part of the central part through the gap between the heat absorbing parts; a fixing plate arranged on the upper part of the central part and fixing the first and second heat radiating units on the supporting member by being connected to the end of the respective supporting rod.

[22] The supporting rod may be a cross sectional shape corresponding to the gap between the heat absorbing parts and may be inserted into the gap. [23] A fin may be formed on at least one of 4 supporting rods in all directions of the center of the central part.

[24] A connecting hole may be formed on the supporting rod and the fixing plate to mount the cooling fan.

[25] Here, the central part may contact the heat source by being rotationally connected to a mounting bracket, since the heat-sink device further includes the mounting bracket which is installed on the substrate having the heat source mounted thereon and having the internal thread formed inside, and the penetrating part is formed in the supporting member, and the external thread corresponding to the internal thread is formed on the outer circumference of the supporting member.

[26] The present invention may further include at least one spacer arranged in the heat radiating part to widen the heat radiating part from each other in all directions when the heat absorbing parts are adhered to each other.

[27] The present invention may further include a pinch member connected to the outer end of the respective heat radiating part to maintain the predetermined distance between the ends so that the heat radiating parts generally widen to be the shape of "(

)"• [28] Here, the pinch member includes a band-shape body arranged along a group of heat radiating parts widened in one side direction of the heat radiating unit and a plurality of protrusions protruded from the body to the heat radiating part, and the heat radiating part may have a bend part bent to be the shape of "D," and a cutout part arranged in the bend part to accommodate the protrusion in the bend part.

[29] The protrusion has a fixing protrusion formed in the end of the protrusion perpendicular to the direction of the protrusion and a receiving recess accommodating protrusions is formed in the heat radiating part, and therefore the connection of the heat radiating part and the protrusion is maintained.

[30] The respective heat radiating part has a holding protrusion protruded to the pinch member at the end, the pinch member may have a body arranged in the band shape along a group of heat radiating parts which widens in one side direction of the heat radiating unit, and the number of a holding protrusion receiving part is provided corresponding to the number of the holding protrusion and the respective holding protrusion is inserted therein.

[31] The heat-sink may be a cylindrical shape having the outer circumference closed, since a folding part which is bent in the direction of separating the heat radiating parts from each other is arranged on the end of the heat radiating parts.

[32] A first connecting part in which the heat absorbing part of the second heat radiating unit is inserted is arranged in the heat absorbing part of the first heat radiating unit, and a second connecting part in which the heat absorbing part of the first heat radiating unit is accommodated is arranged in the heat absorbing part of the second heat radiating unit.

Brief Description of the Drawings

[33] Fig. 1 is an exploded perspective view according to one embodiment of the present invention, [34] Fig. 2 is a perspective view illustrating the relationship between a first heat radiating unit and an adherent member in the heat- sink device according to one embodiment of the present invention, [35] Fig. 3 is a bottom view of the heat-sink device according to one embodiment of the present invention, [36] Fig. 4 is a magnified view illustrating a mounting unit in the heat-sink device according to one embodiment of the present invention, [37] Fig. 5 is an exploded perspective view of the heat-sink device according to another embodiment of the present invention, [38] Fig. 6 is a bottom view of the heat-sink device according to another embodiment of the present invention, [39] Fig. 7 is a perspective view illustrating the relationship between the first heat radiating unit and the adherent member in the heat- sink device according to another embodiment of the present invention, [40] Fig. 8 is an exploded perspective view of the heat-sink device according to another embodiment of the present invention, [41] Fig. 9 is a plan view of the heat-sink device according to another embodiment of the present invention, [42] Figs. 10 and 11 are perspective views illustrating various connection relationships between the third heat radiating unit and the pinch member in the heat- sink device according to another embodiment of the present invention, [43] Fig. 12 is a cross sectional view illustrating the connected state of the heat radiating plate and the pinch member in the heat-sink device according to another embodiment of the present invention, [44] Fig. 13 is an exploded perspective view of the heat-sink device according to another embodiment of the present invention, [45] Figs. 14 and 15 are plan views illustrating the supporting rods of the heat-sink device according to another embodiment of the present invention, [46] Fig. 16 is a perspective view of lower side of the heat-sink device according to another embodiment of the present invention, [47] Fig. 17 is a side cross sectional view for explaining the mounting method of the heat-sink device according to another embodiment of the present invention. Mode for the Invention

[48] Hereinafter, exemplary embodiments according to the invention will be described in detail with reference to the accompanying drawings.

[49]

[50] [Embodiment 1]

[51] The heat-sink device 1 according to one embodiment of the present invention has an increased heat-radiating efficiency by maximizing the heat radiating area against the heat absorbing area since 2 heat radiating units 31, 35, which is dividing and cooling the heat transfer surface of the heat source 100, are arranged therein.

[52] Referring to Figs. 1 and 2, the heat-sink device 1 according to one embodiment of the present invention includes a heat-sink 10 composed of first and second heat radiating units 31, 35 which are made by overlapping a plurality of sheet- type heat radiating plates, and a connecting part 37 connecting the central parts 32, 36 of the respective heat radiating unit 31, 35.

[53] Referring to Fig. 2, the heat radiating plate 20 includes a heat absorbing part 21 contacting with the heat source 100 to absorb the heat, and a heat radiating part 23 integrally extended from the heat absorbing part 21 to radiate the heat from the heat absorbing part 21 to outside.

[54] The heat radiating plate 20 (hereinafter, the heat radiating plate of the first heat radiating unit 31 and the heat radiating plate of the second heat radiating unit 35 have the same reference numeral) may be in various shapes depending on the need, and the heat radiating plate of the first heat radiating unit 31 and the heat radiating plate of the second heat radiating unit 35 may have the same shape or different shape. That is, a first connecting part 37a (referring to Fig. 2) may be formed at the heat absorbing part 21 of the first heat radiating unit 31 in the downward direction, and a second connecting part 37b (referring to Fig. 1) may be formed at the heat absorbing part 21 of the second heat radiating unit 35 in the upward direction.

[55] The first connecting part 37a and the second connecting part 37b maintain the shape of the heat-sink 10 by inserting the first heat radiating unit 31 and the second heat radiating unit 35 to each other. That is, as described in Fig. 3, the central parts 32, 36 of the first heat radiating unit 31 and the second heat radiating unit 35 are mutually inserted to each other at the connecting part 37, and thus the central parts 32, 36 of the heat radiating units 31, 35 are connected to each other in the shape of "+." Therefore, the heat absorbing parts 21 of the second heat radiating unit 35 is prevented from being separated by the first connecting part 37a of the first heat radiating unit 31, and the heat absorbing parts 21 of the first heat radiating unit 31 is prevented from being separated by the second connecting part 37b of the second heat radiating unit 35, and thus the intensively packed cylindrical shape is maintained without additional adherent member 40 or the joint 45.

[56] The heat absorbing part 21 absorbs the heat from the heat source 100 as it is disposed in one side of the heat radiating plate 20 and contacts to the heat source 100. The heat absorbing part 21 forms the heat absorbing surface in which a plurality of heat absorbing part 21 are adhered to each other in the thickness direction and contacts to the heat source 100.

[57] The heat radiating part 23 is extended from the heat absorbing part 21 to radiate the heat absorbed from the heat absorbing part 21 to the outside. The heat radiating part 23 is extended only in one direction, or it may be extended to both sides, as described in Fig. 2.

[58] As described in Fig. 2, the heat radiating part 23 may be in the shape of "D" centering on the heat absorbing part 21. In this case, the distance and the height between the ends of the respective heat radiating part 23 may have various figures according to the size of the cooling fan 85 (referring to Fig. 5) mounted on the heat- sink 10.

[59] The adherent member 40 (referring to Figs. 1 and 2) is arranged at the central part

32 of the first heat radiating unit 31 so that it adheres to both ends of the heat absorbing part 21 disposed in the outmost part of the first heat radiating unit 31.

[60] Here, the joint 45 for maintaining the adherent state between the adherent member

40 and the respective heat absorbing part 21 may be further included. For example, the joint 45 is composed of a bolt 45b penetrating the first through hole 45a formed on the adherent member 40 and the respective heat radiating plate 20, and a nut 45c connected to the bolt 45b from the opposing side of the bold 45b.

[61] The lower part of the adherent member 40, i.e. one side toward the heat source 100 may have the shape corresponding to that of the inner circumference of the first fixing member 51 so that the first fixing member 51 is connected thereto.

[62] More than one spacer 81 (referring to Fig. 3) arranged in the respective heat radiating plate 20 make the respective heat radiating part 23 to widen in all directions, as the neighboring heat absorbing part 21 is adhered by the adherent member 40. The spacer 81 may be in various types, for example, as described in Fig. 8, it may be the protrusion protruding from one side of the heat absorbing part 21 of the heat radiating plate 20 to the neighboring heat absorbing part 21, and it may be the one obtained by bending one region of the heat absorbing part 21 of the heat radiating plate 20 in the shape of "S" in the flat surface direction.

[63] The first heat radiating unit 31 and the second heat radiating unit 35 are orthogonally connected so that the central parts 32, 36 contact the heat transfer surface of the heat source 100 simultaneously. [64] Fig. 3 is a view illustrating the heat absorbing surface contacting to the heat source

100 in the state that the first and second heat radiating units 31, 35 are connected to each other. Referring to the drawing, all heat radiating plates 20 of the first and second heat radiating units 31, 35 contact the heat source 100 and they spread in the cylindrical shape centering on the central parts 32, 36 which contact to the heat source 100.

[65] Therefore, the heat radiating part 23 can spread more to be the shape of a circle rather than forming the heat-sink 10 with one heat radiating unit 31, 35 and thus the vacant space, in which the heat radiating part 23 is not present, is diminished, thereby increasing the radiating area. Also, the relatively increased heat radiating plates 15 may be included in the same heat radiating space.

[66] Referring to Figs. 1 and 4, the mounting unit 50 includes a first fixing member 51 connected to the lower part of the adherent member 40, a bracket 55 which is mounted on the substrate 110 and has the through hole 56, and a second fixing member 53 on the through hole 56.

[67] The first fixing member 51 has the shape of a ring with an external thread 52 on the outer circumference and connected to the lower part of the adherent member 40 facing the heat source 100. Here, the thickness of the external thread 52 is different to the needs.

[68] The bracket 55 is installed on the substrate 110 on which the heat source 100 is mounted and has a through hole 56 so that the central parts 32, 36 may penetrate the through hole 56 and contact the heat source. The bracket 55 may be in various shapes. For example, as described in Fig. 4, the bracket 55 may be in the shape of a plate with a separated supporting part 57 which is supporting the through hole 56 to be positioned at a certain height from the heat source 100. The separated supporting part 57 may be integrally formed with the bracket 55, as described in Fig. 1.

[69] In this case, the bracket 55 serves as a plate spring having restoring force toward the substrate 110 so that the heat-sink 10 is adherent to the heat source 100. The bracket 55 may be in various shapes corresponding to the shape of a socket when the separate socket (not illustrated) for mounting the heat-sink is disposed on the substrate 110.

[70] The second fixing member 53 is connected to the through hole 56, and the internal thread 54 corresponding to the external thread 52 of the first fixing member 51 is formed on the inner circumference. The second fixing member 53 may be integrally formed with the bracket 55.

[71] Hereinafter, the assembling and mounting procedure of the heat-sink device according to one embodiment of the present invention will be described with reference to Figs. 1 to 4.

[72] According to the assembling procedure of the heat-sink, the heat-sink is assembled by the joint 45 while both ends of the heat absorbing part 21 are pressed and adhered via the adherent member 40 after overlapping a plurality of heat radiating plates 20 of the first heat radiating unit 31.

[73] The central parts 32, 36 may be tightly connected to the heat source 100 by treating the contact surface of the heat absorbing part 21 which contacts to the heat source 100. Here, the heat radiating part 23 of the heat radiating plate 20 may widen at the time of when the adherent is placed by a spacer 81, and may widen after the adherence is done.

[74] The first connecting part 37a for accommodating the central part 36 of the second heat radiating unit 35 is formed at the central part 32 of the first heat radiating unit 31.

[75] After that, the second heat radiating unit 35 is formed by overlapping a plurality of heat radiating plates for the second heat radiating unit 35. And, the central part 36 of the second heat radiating unit 35 is connected to the first connecting part 37a from the lower part of the first heat radiating unit 31 and the first fixing member 51 is connected to the lower part of the adherent member 40, i.e. one side toward the heat source 100.

[76] The second heat radiating unit 35 may widen the respective heat radiating part 23 in all directions by the spacer 81 or additional operation. The heat radiating part 23 has cylindrical shape centering on the central parts 32, 36 while the first and second heat radiating units 31, 35 are connected to each other.

[77] The bracket 55 is mounted on the substrate 110 on which the heat source 100 is mounted so that the through hole 56 is positioned on the upper part of the heat source 100. The second fixing member 53 having the internal thread 54 on the inner circumference is connected to the through hole 56.

[78] As described in Fig. 4, the central parts 32, 36 drops to contact the heat source 100 if the heat-sink 10 rotates, after tooth-connecting the heat-sink 10 having the first fixing member 51 to the second fixing member 53.

[79] Therefore, if the heat is generated by the operation of the heat source 100, then the generated heat is transferred to the respective heat radiating unit 31, 35 via the central parts 32, 36 of the respective heat radiating unit 31, 35, and the heat is discharged to the outside via the heat radiating part 23 of the respective heat radiating unit 31, 35.

[80]

[81] [Embodiment 2]

[82] The heat-sink device 1 according to another embodiment of the present invention relates to the heat-sink device 1 capable of functioning the spacer displacing the heat radiating parts 23 from each other and functioning the cut off layer preventing the cool air blown from the cooling fan 85 from losing, by disposing the folding part 24 in the end of the heat radiating part 23 arranged on the respective heat radiating plate 20.

[83] This embodiment of the present invention will be described about the difference between the embodiment described above. [84] Fig. 5 is an exploded perspective view of the heat-sink device 1 according to another embodiment of the present invention.

[85] The heat radiating plate 20 of the heat- sink device 1 according to another embodiment of the present invention includes the folding part 24 (referring to Fig. 6) which is bent in the direction of separating the respective heat radiating part 23 at the end of the heat radiating part 23.

[86] The bending direction of the folding part 24 is not restricted, for example, as described in Fig. 5, the bending direction of the folding part 24 may have the same direction along the overall heat-sink 10 and the bending direction of the folding part 24 may be different according to the respective heat radiating unit 31, 35. The entire heat radiating part 23 may be bent, or one region of the heat radiating part 23 may be bent to form the folding part 24 as described in Fig. 7.

[87] The folding part 24 naturally widens gaps between the heat radiating parts when the heat absorbing part 21 is adhered to form the central part 32. Therefore, the heat-sink 10 according to another embodiment of the present invention no longer needs the separate spacer 81, thereby reducing the manufacturing cost, and the heat radiating part 23 spreads effectively by bending the end of the heat radiating part 23 after the heat radiating plate 20 is manufactured.

[88] Here, the length of the folding part 24 may be different according to the needs. That is, the length of the folding part 24 relates to the distance between the heat radiating parts 23, and therefore, for example, the length of the folding part 24 is long if the heat radiating plates 20 consist of the fewer heat radiating plates, and the length of the folding part 24 is short if the heat radiating plates 20 consist of a lot of the heat radiating plates.

[89] The bending angle of the folding part 24 may be various as long as the angle makes the end of the folding part 24 contact to the neighboring heat radiating part 23 (referring Figs. 6 and 7).

[90] As described in Fig. 6, the folding part 24 prevents the cooling air blown from the cooling fan 85 mounted on the upper part of the heat-sink 10 from being discharged to the outer circumference of the cylinder by blocking the outer circumference of the cylinder when the heat radiating parts 23 spread in the cylindrical shape. Therefore, the cooling air is concentrically blown into the heat source 100, and the divergence of the heated air flow to the surroundings of the heat source 100 is prevented, and thus the thermal effect to the additional parts is reduced.

[91] The cooling fan 85 is arranged on the upper part of the heat-sink 10 to blow the cooling air to the heat source 100. Here, the cooling fan 85 may have various kinds, however it is preferable that the cooling fan is an axial-flow fan generating the air flow in the axial direction. [92] The cooling fan supporting part 87 is provided to mount the cooling fan 85 on the heat-sink 10 or the substrate 110, on which the heat source is mounted, to be able to install and uninstall. The cooling fan supporting part 87 may have various kinds, for example, as described in Fig. 5, the cooling fan supporting part 87 may have a first supporting bracket 87a connected to the lower part of the cooling fan 85 on one side, a second supporting bracket 87b connected to the upper end of the adherent member 40 on the other side. Here, a plurality of cooling fan connecting holes 87c is formed at the supporting bracket 55.

[93]

[94] [Embodiment 3]

[95] The heat-sink device 1 according to another embodiment of the present invention relates to the heat-sink device 1 which increases the heat-radiating efficiency by providing the pinch member 60 to the outside of the heat radiating part 23, thereby improving the shape of the gap of the respective heat radiating plate 20.

[96] This embodiment of the present invention will be described about the difference between the above described embodiments.

[97] Referring to Fig. 8, the heat-sink device 1 according to the present invention, wherein the heat radiating units 31, 35 are made by overlapping a plurality of heat radiating plates 20 which has a heat absorbing part 21 and a heat radiating part 23 extended from one side of the heat absorbing part 21, and including: an adherent member 40 pressing the heat absorbing parts 21 to each other; a spacer 81 widening gaps between the heat radiating parts 23 in all directions when the heat absorbing parts 21 is adherent to each other; and a pinch member 60 connected to the end of the heat radiating part 23 and maintaining the predetermined distance between the ends so that the heat radiating parts 23 widen generally in the shape of "( )".

[98] The spacer 81 is provided on the respective heat radiating part 23 and widens gaps between the heat radiating parts 23 in all directions when the heat absorbing parts 21 is adherent to each other. The spacer 81 may be provided in various methods, for example, the spacer 81 may have a predetermined distance by drilling one side of the heat radiating part 23 to protrude it to one surface, as described in Figs. 8 and 10. Here, the number of the spacer 81 may be different according to the needs, for example, 3 spacers may be provided, as described in Fig. 10.

[99] The pinch member 60 is connected to the end of the heat radiating part 23 and makes the heat radiating parts 23 to be the shape of "( )" by maintaining the predetermined distance. As described in Fig. 10, for example, the pinch member 60 may include a body 61 arranged in a band shape along a group of heat radiating parts widened in one side direction of the heat radiating unit 31, 35, and a plurality of protrusions 65 protruding from the body 61 to the heat radiating part 23. [100] Here, an anchor 62 may be further provided in both ends of the body 61 for maintaining the state fixed to the heat radiating part 23 which is disposed in the outmost part.

[101] The protrusion 65 is extended from the body 61 to the heat radiating part 23 and connected to the heat radiating part 23. The number of the protrusion 65 corresponds to the number of the heat radiating part 23 and the respective protrusion 65 is formed at a predetermined interval. For example, the interval corresponds to the thickness of the heat radiating part 23 or the multiple thereof. Here, the protrusion 65 may be provided in any one of the upper part or the lower part of the body 61, or it may be provided in both parts.

[102] As described in Fig. 10, the bend part 25 bent in the shape of "D" is formed at the end of the heat radiating part 23.

[103] As described in Fig. 10, in case of forming the bend part 25 at the end of the heat radiating part 23, it is easy to arrange a plurality of heat radiating plates 20 when the heat radiating unit 31 , 35 is formed by overlapping a plurality of heat radiating plates 20, and the connection between the respective protrusion 65 and the respective heat radiating part 23 is made with ease because the heat radiating part 23 is arranged at a predetermined interval.

[104] Also, as described in Fig. 9, both the bend part 25 and the pinch member 60 maintain the external shape of the heat- sink device 1 after the assembly of the heat- sink device 1 is completed, and thus the deformation of the heat-sink device 1 is prevented on installing and changing the heat-sink device 1, in particular, it provides adequate strength to the heat-sink device when the heat-sink device 1 is mounted by rotation.

[105] The cutout part 26 accommodating the protrusion 65 into the bend part 25 is formed in the heat radiating plate 20. Here, the cutout part 26 is arranged at the position corresponding to the holding protrusion 28. Therefore, in case of connecting the pinch member 60 to the heat radiating unit 31, 35, the respective protrusion 65 is inserted into the respective bend part 25 via the cutout part 26 and it maintains the predetermined gap between the heat radiating parts 23, as described in Fig. 12.

[106] As described in Fig. 12, a fixing protrusion 67 protruding in the horizontal direction may be further provided at the end of the respective protrusion 65. The fixing protrusion 67 securely maintains the connection between the pinch member 60 and the heat radiating element 31, 35 by being accommodated in the receiving recess 27 of the heat radiating part 23 when the pinch member 60 and the heat radiating element 31, 35 are connected to each other.

[107] The pinch member 60, as described in Fig. 11, may include a body 61 arranged in a band shape along a group of heat radiating parts 23 widened in one side direction of the heat radiating unit 31, 35, and the number of a holding protrusion receiving part 63 is provided corresponding to the number of the holding protrusion 28, therefore the respective holding protrusion 28 disposed in the heat radiating part 23 is inserted in the holding protrusion receiving part 63.

[108] As described in Fig. 11, the number of the holding protrusion 28 may be various, and the holding protrusion 28 may be arranged at one side or both sides of the cutout part 26. In the latter case, the number of holding protrusion receiving part 63 is further formed corresponding to the number of the holding protrusion 28 in the pinch member 60.

[109] Here, the length of the circular arc of the heat radiating parts 23, which narrows by the pinch member 60, should be shorter than the length of the circular arc of the heat radiating parts 23 which widens by the spacer 81 without the pinch member 60. The number of the pinch member 60 is various, however, it is preferable that the number of the pinch member corresponds to the number of the heat radiating parts 23.

[110] Hereinafter, the assembling procedure of the heat-sink device 1 according to the present invention is described with reference to the drawings.

[I l l] Referring to Fig. 10, a plurality of heat radiating plates 20 having the connecting part 37 are overlapped in the thickness direction to form the first heat radiating unit 31. Here, the respective heat radiating plate 20 is uniformly arranged at the interval corresponding to the bend part 25, since the bend part 25 is formed at the end of the heat radiating plate 20.

[112] After that, the respective protrusion 65 of the pinch member 60 is inserted into the bend part 25 via the cutout part 26 by mounting the pinch member 60 on both sides of the heat radiating plate 20. Here, the pinch member 60 is easily connected to the heat radiating part 23, because a plurality of heat radiating plates 20 are arranged at a predetermined interval and the protrusion 65 of the pinch member 60 is formed in the position corresponding to the bend part 25.

[113] Subsequently, if the heat absorbing parts 21 are pressed and adhered to each other, the respective heat radiating part 23 widens in a fan-shape centering on the heat absorbing part 21 by the spacer 81 disposed in the heat absorbing part 21. Here, the heat radiating part 23 does not widen more than the length of the longitudinal direction because the length of the longitudinal direction is fixed, and therefore it has the convex shape as described in Fig. 8.

[114] Therefore, in order to form the heat radiating parts 31 and 35 by overlapping a plurality of heat radiating plate 20 in sheet-shape with reference to the heat-sink device 1 according to another embodiment of the present invention, the predetermined gap between the heat radiating parts 23 disposed in the heat absorbing part 21 is maintained and the gap between the heat radiating parts 23 is minimized by widening the heat radiating parts 23 in the convex shape while the pinch member 60 narrows the gap at a predetermined interval between heat radiating parts 23 at the end of the heat radiating part 23.

[115] Therefore, the cooling air blown from the upper part of the heat-sink device 1 is not discharged to the gap between the heat radiating parts 23 and the heat-radiating efficiency is increased by making the cooling air flow into the extended gap between the heat radiating parts of the heat absorbing part 21.

[116]

[117] [Embodiment 4]

[118] The heat-sink device 1 according to another embodiment of the present invention includes the supporting unit 70 which prevents the cooling air from being discharged by filling the space between the heat absorbing parts 21, and accomplishing the heat radiating function by direct contacting the heat source 100, thereby supporting the heat-sink 10 to the substrate 110.

[119] Another embodiment of the present invention will be described about the difference between the above described embodiments.

[120] Referring Fig. 13, the heat-sink device 1 according to another embodiment of the present invention includes a first heat radiating unit 31, a second heat radiating unit 35 and a supporting unit 70, which contact the heat source 100 (referring to Fig. 17) respectively.

[121] The supporting unit 70 has a supporting member 71, 4 supporting rods 73 and a fixing plate 75.

[122] The supporting member 71 surrounds the lower part of the central parts 32, 36, and a penetrating part 72b is formed therein so that the lower part of the central parts 32, 36 contacts with the heat source 100. The shape of the supporting member 71 is various, for example, the shape of the supporting member 71 may be in the shape of the polygonal box corresponding to the heat source 100 or in the cylindrical shape as described in Fig. 13.

[123] The penetrating part 72b increases the heat transfer rate from the heat source 100 by maintaining the shape of the heat absorbing part 21 of the central parts 32, 36 not to be separated from each other and contacting the heat absorbing part 21 with the heat source 100.

[124] An additional flatting operation such as a milling may be executed so that the lower part of the central part 32, 36 penetrated the supporting member 71 is to be same level of the surface to the lower part of the supporting member 71 (referring to Fig. 16). The flatting operation prevents the heat transfer surface from being reduced due to the reduction of the heat transfer surface as the supporting member 71 and the central part 32, 36 are incompletely contacted with the heat source 100. [125] Here, the heat transferred from the heat source 100 through the central part 32, 36 is transferred to the outside via the heat radiating part 23 of the heat radiating unit 31, 35, and the heat transferred to the supporting member 71 is transferred to the outside via the supporting rod 73 or the heat radiating part 23 connected to the supporting rod 73.

[126] As described in Figs. 13 and 16, an external thread 72a may be formed on the outer circumference when the supporting member 71 is in a cylindrical shape. Therefore, it is rotationally connected to the internal thread 59 formed on the mounting bracket 58 installed in the substrate 110 with the heat source 100. The shape of the supporting member 71 may be different according to the connection type.

[127] The supporting rod 73 extends from the supporting member 71 to the upper part of the central part 32, 36 through the gap between the heat absorbing parts 21 of the central part. The number of the supporting rod 73 is 4 corresponding to the space between the heat absorbing parts 21, and the supporting rod 73 may be integrally formed with the supporting member 71 or separately formed.

[128] As described in Fig. 14, the supporting rod 73 prevents the respective heat absorbing part 21 from being displaced by pressing the end of the heat absorbing part 21 positioned at the outermost region, as the supporting rod 73 is shaped to the corresponding shape and fitted into the space between the heat absorbing parts 21. That is, the shape of the heat-sink 10 is maintained in the center region of the heat absorbing part 21 because the center region is securely fixed by the connecting part 37, however the connection is weak at the outmost region of the heat absorbing part 21 and thus the heat absorbing parts 21 may be separated from each other in this region.

[129] Also, the supporting rod 73 may prevent the cooling air from being discharged by filling up the space between the heat absorbing parts 21 and may discharge the heat transferred from the supporting member 71 to the outside. In this case, as described in Fig. 15, it is possible to further increase the radiating area by forming the fin 74 in all directions of the center of the central part 32, 36. Here, the fin 74 may be formed on the entire supporting rod 73 or some region of the supporting rod.

[130] The fixing plate 75 fixes the heat radiating unit 31, 35 to the supporting member 71 as the fixing plate 75 is arranged on the upper part of the central part 32, 36 and connected to the end of the supporting rod 73. For this end, the second connecting hole 76a for mutual connecting may be formed on the fixing plate 75 and the supporting rod 73, and the third connecting hole 76b for mounting the cooling fan 85 may be formed on more than 2 fixing plates 75 and supporting rods 73.

[131] The shape of the fixing plate 75 is various, for example, as described in Fig. 13, a recess with certain shape and size is formed on the central part and 4 edges so as not to block the air blown from the cooling fan 85 from being transferred to the heat radiating part 23. Industrial Applicability

[132] According to the heat-sink device of one embodiment of the present invention, the heat-radiating efficiency is increased, since the radiating area against the absorbing area is maximized thanks to the densely packed cylindrical shape. Also, the installation and separation of the heat-sink is easily accomplished, since the heat-sink is able to be mounted on the substrate by rotating it and there is no need to screw-connect them via a narrow gap between the heat radiating parts.

[133] According to another embodiment of the present invention, the bend part serves as the spacer, as well as prevents the cooling air from being discharged, and guides the cooling air into the outer circumference surface, simultaneously.

[134] According to another embodiment of the present invention, since the pinch member for maintaining the gap widened by the spacer is provided, it is possible to minimize the gap between the heat radiating parts while securing the gap between the heat radiating parts disposed in the heat absorbing side by widening the heat radiating parts in the convex shape.

[135] According to another embodiment of the present invention, since the supporting unit is provided, it is possible to maintain the shape of the heat-sink while preventing the cooling air from being discharged by filling up the space between the heat absorbing parts and serving the radiating function.

Claims

[1] A heat-sink device, comprising: a heat-sink composed of a heat radiating plate in sheet-shape having a heat absorbing part contacting with a heat source and a heat radiating part integrally extended from both sides of the heat absorbing part; wherein the heat-sink is composed of first and second heat radiating units in which each heat radiating unit is formed by overlapping a plurality of the heat radiating plates in a sheet-shape, the heat absorbing part of the respective heat radiating plate is adhered closely to the neighboring heat absorbing part of the heat radiating plate and forms a central part which contacts with the heat source, and the heat radiating part of the respective heat radiating plate widens in all directions from the central part; wherein each heat radiating unit is connected to each other in the shape of "+" at the central part to connect to the heat source respectively and the respective heat radiating part widens from the central part in all directions to be a densely packed cylindrical shape.

[2] The heat-sink device as claimed in claim 1, further comprising: an adherent member which is arranged on the central part of the first heat radiating unit and closely connects the respective heat absorbing part of the first heat radiating unit to both sides of the heat absorbing part disposed in the outer most end of the first radiating unit; and a joint maintaining the adhered state that the adherent member adheres the respective heat absorbing part to each other.

[3] The heat-sink device as claimed in claim 2, further comprising: a mounting unit including a first fixing member in a ring-shape which has an external thread on the outer circumference and is connected to the lower part of the adherent member; a bracket installed at a substrate on which the heat source is mounted and has a through hole so that the central part may penetrate the through hole and contact the heat source; and a second fixing member connected to the through hole and has an internal thread corresponding to the external thread; wherein the mounting unit is able to mount the heat-sink on the heat source by tooth-engaging the first fixing member with the second fixing member in a rotational fashion and by contacting the respective central part to the heat source.

[4] The heat-sink device as claimed in claim 1, further comprising: a supporting unit, wherein the supporting unit includes a supporting member surrounding the lower part of the central part, and in which a penetrating part is formed so that the lower part of the central part may penetrate the penetrating part and contact to the heat source; 4 supporting rods extended from the supporting member to the upper part of the central part through the gap between the heat absorbing parts; a fixing plate arranged on the upper part of the central part and fixing the first and second heat radiating units on the supporting member by being connected to the end of the respective supporting rod.

[5] The heat-sink device as claimed in claim 4, wherein the supporting rod has a cross sectional shape corresponding to the gap between the heat absorbing parts to be inserted into the gap.

[6] The heat-sink device as claimed in claim 5, wherein a fin is formed on at least one of 4 supporting rods in all directions of the center of the central part.

[7] The heat-sink device as claimed in claim 4, wherein a connecting hole for mounting the cooling fan is formed on the supporting rod and the fixing plate.

[8] The heat-sink device as claimed in any one of claims 4 to 7, wherein the central part may contact the heat source by being rotationally connected to a mounting bracket, since the heat-sink device further includes the mounting bracket which is installed on the substrate having the heat source mounted thereon and having the internal thread formed inside, and the penetrating part is formed in the supporting member, and the external thread corresponding to the internal thread is formed on the outer circumference of the supporting member.

[9] The heat-sink device as claimed in claim 1, further comprising: more than one spacer which is arranged in the heat radiating part to separate and widen the heat radiating part from each other in all directions when the heat absorbing parts are adhered to each other.

[10] The heat-sink device as claimed in claim 9, further comprising: a pinch member which is connected to the outer end of the respective heat radiating part and allows the respective end to be separated at a predetermined distance so that the heat radiating parts widen in the shape of "( )".

[11] The heat-sink device as claimed in claim 10, wherein the pinch member includes a body arranged along a group of heat radiating parts widened in one side direction of the heat radiating unit; a plurality of protrusions protruded from the body to the heat radiating part; the heat radiating part has a bend part bent in the shape of "D"; and a cutout part arranged in the bend part and accommodating the protrusion in the bend part.

[12] The heat-sink device as claimed in claim 11, wherein the protrusion has a fixing protrusion formed at the end of the protrusion perpendicular to the direction of the protrusion and a receiving recess is formed in the heat radiating part to fix the heat radiating part to the protrusion which are connected to each other.

[13] The heat-sink device as claimed in claim 10, wherein the respective heat radiating part has a holding protrusion protruded to the pinch member at the end, and the pinch member has a body which is arranged in a band shape along a group of heat radiating parts widened in one side direction of the heat radiating unit, and a holding protrusion receiving part which is provided with the number corresponding to the number of the holding protrusion, thereby having the respective holding protrusion inserted therein.

[14] The heat-sink device as claimed in claim 1, wherein. The heat-sink may be a cylindrical shape having the outer circumference closed, since a folding part which is bent in the direction of separating the heat radiating parts from each other is arranged on the end of the heat radiating parts.

[15] The heat-sink device as claimed in claim 1, wherein a first connecting part in which the heat absorbing part of the second heat radiating unit is inserted is arranged in the heat absorbing part of the first heat radiating unit, and a second connecting part in which the heat absorbing part of the first heat radiating unit is inserted is arranged in the heat absorbing part of the second heat radiating unit.