<19)United States
`<12)Patent Application
`Li
`
`Publication
`
`(10)Pub. N0.:US 2007/0279909A1
`(43)Pub. Date:
`Dec. 6, 2007
`
`US 20070Z79909A1
`
`(54)
`
`HEAT-DISSIPATING STRUCTURE HAVING
`MULTIPLE HEAT PIPES FOR LED LAMP
`
`(76)
`
`Inventor:
`
`Jla-l-lao Ll. Sindian City (TW)
`
`Correspondence Address:
`I-IDSL
`4331 STEVENS BATTLE LANE
`FAIRFAX, VA 22033
`
`(21)
`
`Appl. No.:
`
`ll/422,371
`
`(22)
`
`Filed:
`
`Jun. 6, 2006
`
`Publication Classification
`
`(51)
`
`(52)
`
`Int. Cl.
`(2006.01)
`FZIV 29/00
`U.S. (fl.
`..................................................... .. 362/294
`
`(S7)
`
`ABSTRACT
`
`A heat-dissipating structure having multiple heat pipes for a
`LED lamp is capable ufperfurming the heat dissipation ul
`the LED lamp. The heat-dissipating structure includes a seat
`to be heated and a plurality of heat pipes. The bottom surface
`of the seat to be heated has a surface to be heated for
`adhering to the LED lamp. The top surface of the seat to be
`heated has a heat-dissipating surface opposing to the surface
`to be heated. Each heat pipe has an end to be heated and a
`condensed end away from the end to be heated. On the
`heat-dissipating surface of the seat to be heated. a plurality
`of through holes is provided. The number of the thmugh
`holes is consistent with that of the heat pipes. The axial
`direction of the end to be heated of the heat pipe is identical
`to that of the corresponding through hole. and is substan­
`tially perpendicular to the heat-dissipating surface ofthe seat
`to be heated.
`
`QmafitfitamI
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`Patent Application Publication
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`Dec 6 2007 Sheet 1 of 9
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`US 2007/0279909 A1
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`Patent Application Publication
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`07 Sheet 2 of 9
`Dec. 6, 20
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`Dec. 6, 2007 Sheet 3 of 9
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`US 2007/0279909 A 1
`
`Dec. 6, 2007
`
`I-IEAT-DISSIPATIYG STRUCTURE HAVING
`MULTIPLE HEAT PIPES FOR LED LAMP
`
`BACKGROUND Ol*'THE INVENTION
`
`l. Field of the I_nvention
`[0001]
`[0002] The present invention relates to a heat-dissipating
`structure having r11ultipleheat pipes for a LED lamp, and in
`particular to a heat-dissipating structure having multiple heat
`pipes for a LED lamp, which is capable of perfonning the
`heat dissipation ofthe LED lamp by arranging tl1emaximum
`number of LED lamps Within the limited area.
`[0003]
`2. Description of Prior Art
`[0004] Since light-emitting diodes (LED) are high-inten­
`sity, energy-saved and long-life, they are widely used in tl1e
`illumination of electronic devices or lamps. Further, in order
`to increase the illtuninating range and intensity thereof, a
`plurality of light-em_itting diodes are usually combined to
`form a LED lamp set. However, with the increase in the
`number of light-ernitting diodes and the subsequent devel­
`opment of high-power light-emitting diodes, the heat gen­
`erated by the operation of the light-emitting diodes is
`inevitably increasing. Therefore, it is ar1important issue for
`those skilled in this art to provide a heat-dissipating structure
`for LED lamps.
`[0005] The existing heat-dissipating structure for the LED
`lamp is mainly constituted of heat pipes and fins. However,
`due to the restriction caused by the heat-dissipating device
`of the central processing unit (CPU) of the computer, it is
`still necessary for the heat pipes in the existing heat­
`dissipating structure for the LED lamp to be bent to fon11
`into a U-lettered or I,-lettered shape, causing the reduction
`in the performance of the heat pipes. Further, the number of
`the heat pipes arranged within the limited area cannot be
`increased. Therefore,
`the conventional heat-dissipating
`structure camiot confonn to the requirements for the heat
`dissipation of the LED lamp.
`[0006]
`In view of the above, the inventor proposes the
`present invention to overcome the above problems based on
`his expert experiences and deliberate researches.
`
`SUMMARY OF THE INVENTION
`
`[0007] The present invention is to provide a heat-dissipat­
`ing structure having multiple heat pipes for a LED lamp, in
`which eaeh heat pipe is arranged upright on a seat to be
`heated. The seat to be heated adheres to a base plate of tl1e
`LED lamp for heat dissipation. Since each heat pipe is
`arranged upright, the maximum number of the heat pipes
`arranged within the lir11itedarea of the seat to be heated can
`be increased. Further, it is not necessary for the heat pipes to
`be bent ir1toa U-lettered or L-lettered shape. Therefore, the
`risk of reducing the performance of the heat pipe can be
`eliminated, so that it is more suitable for the heat dissipation
`of the LED lar11p.
`[0003] The present invention provides a heat-dissipating
`structure having multiple heat pipes for a LED lar11pcapable
`of performing the heat dissipation of the LED lamp. The
`heat-dissipating structure comprises a seat to be heated and
`a plurality ofheat pipes. The bottom surface ofthe seat to be
`heated has a surface to be heated for adhering to the LED
`lamp. The top surface of the seat
`to be heated has a
`heat-dissipating surface opposing to the surface to be heated.
`Each heat pipe has an end to be heated and a condensed end
`away fror11the end to be heated. O11the heat-dissipating
`
`surface of the seat to be heated, a plurality of through holes
`is provided. The number of the through holes is consistent
`with that of the heat pipes. The axial direction of the end of
`the heat pipe to be heated is identical to that of the corre­
`sponding through hole, and is substantially perpendicular to
`the heat-dissipating surface of the seat to be heated. With the
`above arrangement, a heat-dissipating structure having mul­
`tiple heat pipes for a LED lamp can be obtained.
`
`BRIEF DESCRIPTION OF TIIE DRAWINGS
`
`[0009] FIG. 1 is ar1 exploded perspective view of the
`present invention;
`[0010]
`l-TG.2 is ar1assembled view of the present inven­
`lion;
`[0011] FIG. 3 is a cross-sectional view taken along the line
`3-3 of FIG. 2;
`[0012] FIG. 4 is a partial schematic view showing the seat
`to be heated of another embodiment of the present invention;
`[0013] FIG. S is a partial schematic view showing the seat
`to be heated of still another embodiment of the present
`invention;
`[0014] FIG. 6 is a cross-sectional view showing the profile
`of the heat pipe of another embodiment in accordance with
`FIG. 3;
`l-TG. 7 is an assembled view showing that
`[0015]
`present invention is applied to a LED lamp;
`[0016] FIG. 8 is an assembled view showing that another
`embodiment of the present invention is applied to a LED
`lamp;
`[0017] FIG. 9 is an enlarged view showing the details of
`the portion A in FIG. 8; and
`[0018] FIG. 10 is schematic view showing the combina­
`tion of the seat to be heated and the heat pipe.
`
`the
`
`DETAILED DESCRIPTION OF THE
`INVENTION
`
`In order to make the Examiner better understand
`[0019]
`tl1echaracteristics and the teclmical contents of the present
`invention, the following detailed description will be made
`with reference to the accompanying drawings. However, it
`should be understood that tl1edrawings are illustrative but
`not used to limit the scope of the present invention.
`[0020]
`\Vith reference to FIG. 7 first, it is an assembled
`View showing that the present invention is applied to the
`LED lamp. The present invention provides a heat-dissipat­
`ing structure having multiple heat pipes for a LED lamp. The
`LED lamp 2 includes a plurality of light-emitting diodes
`(LED) 20 a base plate 21 for providing the light-emitting
`diodes 20 thereon, and a lamp eover 22 covering outside the
`base plate 21. The heat-dissipating structure is provided in
`the rear of the lamp cover 22 and adheres to the back of the
`base plate 21, thereby to dissipate the heat generated by the
`light-emitting diodes 20.
`[0021] With reference to FIG. 1 and FIG. 2, the heat­
`dissipating structure 1 comprises a seat 10 to be seated and
`a plurality of heat pipes 12.
`[0022] The seat 10 to be heated car1be made of materials
`having good heat conductivity (such as aluminum or copper)
`and is formed into a plate body. The bottom surface of the
`seat 10 to be heated has a surface 100 to be heated for
`adhering to the back surface of the base plate 21 ofthe LED
`lamp 21 (FIG. 7). The surface 100 to be heated is substan­
`tially a flat surface. On the other hand, the top surface of the
`
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`US 2007/0279909 A 1
`
`Dec. 6, 2007
`
`seat 10 to be heated has a heat-dissipating surface 101
`opposing to the surface 100 to be heated. A plurality of
`through holes 102 is provided to penetrate through the
`heat-dissipating surface 101 and the surface 100 to be
`heated. Those through holes 102 can be distributed in
`several concentric circles (FIG. 3), and the number of the
`through holes 102 is consistent witl1tl1atof tl1eheat pipes 12.
`[0023]
`In the present embodiment, each through hole 102
`is a hole penetrating throu@ the heat-dissipating surface 101
`of the seat 10 to be heated and the surface 100 to be heated.
`In order to make the surface 100 to be heated adhere to the
`back surface of the base plate 21 ofthe LED lamp 2, a plate
`11 to be heated is adhered to the surface 100 of the seat 10
`to be heated. ln this way, 11otonly the seat 10 to be heated
`adheres to the back surface of the base plate 21 of the LED
`lamp 2 more easily, but also the contacting area between the
`seat 10 to be heated and the base plate 21 of the LEI.) lamp
`2 can be increased.
`[0024] Each above-mentioned heat pipe 12 l1asa11end 120
`to be heated and a condensed end 121 away from the end 120
`to be heated. The end 120 to be heated of each heat pipe 12
`penetrates i11tothe through hole 102 of the seat 10 to be
`heated 10 and is brought in thennal contact therewith and
`connected thereto. The axial direction of the end 120 to be
`heated of
`the heat pipe 12 is identical
`to that of
`the
`corresponding through hole 102 and is substantially perpen­
`dicular to the heat-dissipating surface 101. In addition, the
`bottom of the end 120 to be heated of the heat pipe l2 can
`be forrned into a plane 122 made by machining process, so
`that it ca11adhere to the plate 11 to be heated or the bottom
`surface of each through hole 102 (FIG. 5) to increase the
`contacting area. Thereby, the bottom of the heat pipe 12 can
`be directly heated. Further, the condensed end 121 of each
`heat pipe 12 expands outwardly With the center of the
`heat-dissipating surface 101 as a center ofcircle. In this way,
`the ends 120 to be heated of the heat pipes 12 can be heated
`in a concentrated manner. On the contrary, the condensed
`ends 121 are distributed to expand outwardly to increase the
`space for condensing, thereby to facilitate the heat dissipa­
`tron.
`[0025] As shown in FIG. 4. the seat 10 to be heated can be
`also formed of stacking vertically a plurality of slice plate
`bodies 10a, 10b and 10c. Each plate body 10a, 10b, 10c
`adheres to and is flush with each other. In this Way, it is
`convenient for each plate body 10a, 10b and 100 to penetrate
`orderly into the end 120 to be heated of each heat pipe 12 by
`pressing, thereby to reduce the difliculty in penetration.
`[0026] As
`shown in FIG. 5, each through hole 102
`arranged 011the seat 10 to be heated can be a blind hole,
`which penetrates from the heat-dissipating surface l0l of
`the seat 10 to be heated into the seat 10 to be heated without
`penetrating therethrough.
`'lhus, it is 11otnecessary to adhere
`the plate ll
`to be heated onto the surface 100 to be heated.
`and the fiatness of the surface 100 to be heated can be still
`maintained. In this way, the degree of adhering and the
`contacting area between the surtace I00 to be heated and the
`base plate 21 of the LED la111p2 ca11be increased.
`[0027] As shown i11FIG. 6, the profile of the end 120 to
`be heated of each heat pipe 12 corresponds to that of the
`corresponding through hole 102. Each through hole 102 of
`the seat 10 to be heated ca11be fonned into a non-circular
`shape. The non-circular shape can be polygonal, oval or
`other geometric shape. Alternatively,
`the profile of the
`through l1olemay be provided with at least one fiat surface.
`
`Since the circular profile of the through hole lets the heat
`pipe to rotate therein and thus causes the difficulty in
`positioning or fixing the heat pipe 12 and the through hole
`102, such problem can be prevented by using the throu@
`hole having 11011-circularprofile. In the present embodiment,
`the end 120 to be heated of each heat pipe 12 is formed into
`a fiat pipe to correspond to the profile of the through hole
`102.
`[0028] Therefore, with the above structure, the heat-dis­
`sipating structure having multiple heat pipes for a LEI.)lamp
`can be achieved.
`[0029] According to the above, as shown in FIG. 7, the
`characteristic of the present invention lies in that the heat
`pipes 12 are provided upright on the seat 10 to be heated, so
`that the number ofthe heat pipes arranged Withinthe limited
`area of the heat-dissipating surface 101 ofthe seat 10 to be
`heated can be raised to a maximum. Frmher, since each heat
`pipe 12 is provided upright, it is not necessary to bend the
`heat pipe into a U-lettered or L-lettered shape, so that the
`risk of reducing the perfonnance of the heat pipe 12 caused
`by bending can be eliminated. With the above arrangement,
`it becomes much easier to assemble each heat pipe 12 with
`the seat 10 to be heated. Therefore,
`the manufacttuing
`process also becomes easier so as to reduce the amount of
`the solder. Of course, the condensed end 121 of each heat
`pipe 12 can be also provided with a plurality of heat­
`dissipating fins 3 i11common to facilitate the condensed end
`121 of each heat pipe 12 to perform the heat dissipation.
`[0030]
`Further. as shown in FIG. S and FIG. 9, a flange
`103 protrudes horizontally and outwardly from the outer
`edge of the seat 10 to be heated. With this arrangement, the
`heat-dissipating structure l can be locked or engaged with
`the LED lamp 2 by fixing the fiange 103 with any suitable
`fixing elements (not shown). Alternatively, the fiange 103 is
`provided with a plurality of screw holes 104, so that a screw
`105 can penetrate into each screw hole 104 and is locked on
`the base plate 21 of the LED lamp 2. With the above
`arrangement, the heat-dissipating structure 1 and the LED
`lamp 2 can be combined with each other.
`[0031]
`Further, as shown i11FIG. 10,
`the edge of each
`through hole 102 of the seat 10 to be heated 10 can be
`provided with a small hole 106. When the end 120 to be
`l1eatedofeach heat pipe 12 penetrates into each through hole
`102, the seat 10 to be heated can be erected laterally (that is,
`each heat pipe 12 is arranged horizontally) so that the small
`hole 106 of each through hole 102 is located at an upper
`position. Then, a heat-conducting medium such as heat­
`conducting paste or solder is injected into each small hole
`106. so that the heat-conducting medium flows into the gap
`between the end 120 to be heated of the heat pipe 12 and the
`through hole 102. Finally, the seat 10 to be heated and each
`heat pipe 12 can be connected to each other by welding.
`[0032] According to the above.
`the present
`invention
`indeed achieves the desired effects by employing the above­
`mentioned structtue. Therefore, the present invention has
`novelty a11dinventive steps and completely confonns to the
`requirements for a utility model patent.
`[0033] Although the present invention has been described
`with reference to the foregoing preferred embodiments, it
`will be understood that the invention is not limited to the
`details thereof. Various equivalent variations and modifica­
`tions can still be occurred to those skilled in this art in View
`of the teachings of the present invention. Thus, all such
`
`

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`
`US 2007/0279909 A 1
`
`Dec. 6, 2007
`
`variations and equivalent modifications are also embraced
`within the scope of the invention as defined in the appended
`claims.
`What is claimed is:
`1. A heat-dissipating structure having multiple heat pipes
`for a LED lamp for performing heat dissipation of the LED
`lamp, comprising:
`a seat to be heated, a bottom side of the seat having a
`surface to be heated for adhering to the LED lamp, and
`a top side thereof having a heat-dissipating surface
`opposing to the surface to be heated; and
`a plurality of heat pipes, each heat pipe having an end to
`be heated and a condensed end away form the end to be
`heated, wherein
`the heat-dissipating surface of the seat to be heated is
`provided with a plurality of through holes, the number
`of the through holes is consistent with that of the heat
`pipes, an axial direction of the end to be heated ofthe
`heat pipe is identical to that of corresponding through
`hole and is substantially perpendicular to the heat­
`dissipating surface of the seat to be heated.
`2. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein the seat
`to be heated is a plate body.
`3. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein the seat
`to be heated is fonned of stacking vertically a plurality of
`plate bodies, and the plate bodies adhere to and are flush
`with each other.
`4. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein a plate
`to be heated is adhered to the surface to be heated of the seat.
`5. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein the
`through holes of the seat to be heated are arranged on the
`heat-dissipating surlaee in several concentric circles.
`
`6. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein each
`through hole of the seat to be heated is a l1ole penetrating
`through the heat-dissipating surface of the seat to be heated
`and the surface to be heated.
`7. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein each
`through hole of the seat to be heated is a blind hole.
`8. The heat-dissipating structure having multiple heat
`pipes for a LFD lamp according to claim I, wherein a flange
`protrudes hori7ontally and outwardly from an outer edge of
`the seat to be heated, the flange is provided with a plurality
`of screw holes, and a screw penetrates into each screw hole
`and is locked on the LED la111p.
`9. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein a profile
`of the end to be heated of each heat pipe corresponds to that
`of the corresponding through hole.
`10. The heat-dissipating structtue having multiple heat
`pipes for a LED lamp according to claim 9, wherein each
`through hole of the seat to he heated is formed into a
`non-circular shape.
`11. The heat-dissipating structtue having multiple heat
`pipes for a LPD lamp according to claim 1. wherein an edge
`of the through hole of the seat to be heated is provided with
`a small hole.
`12. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein a
`bottom of the end to be heated of each heat pipe is formed
`into a plane.
`13. The heat-dissipating structure having multiple heat
`pipes for a LED lamp according to claim 1, wherein the
`condensed end of each heat pipe expends outwardly with a
`center of the heat-dissipating surface of the seat to be heated
`as a center of circle.
`
`>k
`
`"1
`
`=1’
`
`‘X’
`
`‘Y
`
`