(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2006/0215408 A1
`
`
` Lee (43) Pub. Date: Sep. 28, 2006
`
`US 20060215408A1
`
`(5.4) LED ILLUNIINATION LAN“)
`
`(52) US. (7|.
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`.............................................................. 362/294
`
`(76)
`
`Inventor:
`
`Sang Woo Lee. Seoul (KR)
`
`Correspondence Address:
`(TANTOR (TOLBURN, LLP
`55 GRIFFIN ROAD SOUTH
`BLOOMFIELD, (-‘T 06002
`
`(21) Appl. NO':
`.
`.
`Filed'
`
`(22)
`(30)
`
`Mar. 23‘ 2005
`Mar. 23. 2005
`
`11/269’307
`,
`N0" 7’ 2005
`Foreign Application Prioritv Data
`'
`(KR) ____________________________ 10-2m5_0023947
`(KR) ............................ 10-2005-0023948
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`F21 V 29/00
`
`(2006.01)
`
`<7
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`AB“ TRACT
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`In addition to the ell'ect of harmonized illumination and
`increased heat radiation. a LED illumination lamp provides
`an improved effect of hermetic seal. anti-vibration and
`waterproofing between components and assures prolonged
`life span. The illumination lamp comprises a body adapted
`to be placed on or around a target illumination object. a LED
`module lying inside the body and a cover mounted on a seat
`pan of the body. The LED module has a printed circuit board
`affixed to the body and a group ol'rcd. green and blue LEDs
`attached to the printed circuit. The cover is provided with a
`semitransparent color-producing pan capable of hannoniz-
`ing colors of the light emitted from the LEDs and an air
`passageway for permitting the heat generated from the LED
`module to dissipate to the outside.
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`Patent Application Publication Sep. 28, 2006 Sheet 1 of 9
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`Patent Application Pubhcation
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`Sep. 28, 2006 Sheet 2 of 9
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`US 2006/0215408 A1
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`Patent Application Publication Sep. 28, 2006 Sheet 5 of 9
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`Sep. 28, 2006 Sheet 6 f 9
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`US 2006/0215408 A1
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`Patent Application Publication Sep. 28, 2006 Sheet 9 of 9
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`US 2006/0215408 A1
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`FIG. 6
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`US 2006/02 I5408 A 1
`
`Sep. 28, 2006
`
`LEI) II,I,U\1IYATIOY LAMP
`
`FIELD OF THE INVENTION
`
`[0001] The present invention is directed to a LED illumi­
`nation lamp for irradiating decorative light on a variety of
`objects such as bridges, buildings and the like, and more
`specifically to a I.ED illumination lamp that has enhanced
`effect of light decoration, heat dissipation and electric
`energy saving, while assuring hermetic seal, anti-vibration
`and waterproofing between lamp components.
`
`BACKGROUND OF THE INVENTION
`
`[0002] As is generally known ir1the art, use has been made
`of varying kinds of illumination lamps for lightening or
`illuminating objects at night or indoors. Such illumination
`lamps are supplied with electric energy from a power source
`and convert
`the electric energy to light energy,
`thereby
`producing a beam of light for illumination Typical examples
`of the illumination lamps include a glow lamp and a fiuo­
`rescent lamp.
`
`[0003] Widely used in recent years is a Light Emitting
`Diode (LED) illumination lar11pthat l1as a benefit of pro­
`viding illumination of different colors, although higher in
`price than the typical lamps referred to above. However, the
`LED illumination lar11pposes a drawback in that it tends to
`be heated up and shows decreased efliciency when used for
`more than a predetermined time period. Use of the LED
`lamp for a prolonged period of time may result in excessive
`heat generation, thus shortening the life span of the lamp.
`
`[0004] A number of solutions have been proposed to the
`problem of excessive heat generation and life span reduc­
`tion, one example of which is disclosed in Korean Utility
`Model Registration No. 20-0336197.
`
`[0005] A front lightening LED lamp taught in the ’l97
`registration includes, as shown ir1FIGS.
`la and lb, a heat
`radiation fin 1 having a cylindrical partition wall lb inte­
`grally fonned witl1a center part la, a cooling fan 2 received
`in t_hecylindrical partition wall lb of the heat radiation [in
`1 for forcibly circulating the air, a circuit board 3 for
`rectifying alternating current to direct current, a socket 5
`attached to the end of the radiation [in 1 and electrically
`connected to a receptacle for a glow lamp, and a printed
`circuit board 4 having a plurality of LEDs 4a and mounted
`on the top of the center part la of the heat radiation fin l.
`Each of the LEDs 4a is coated with a transparent cover 4b.
`Also provided is a transparent lens 6 that allows light to pass
`therethrough.
`[0006] With the construction set forth above, the front
`lightening LED lamp of the ‘I97 registration can exhibit
`increased illuminance wit_hreduced energy consumption,
`provide proper intensity of illumination in complimce with
`the needs of a user by way of employing a structure that
`permits the riser to directly aflix l.F.Ds to the front side ofthe
`lamp and thus confining the direction of light irradiation to
`a frontward direction, and attain cooling efliciency great
`enough to assure that the cooling fan can fully demonstrate
`its performance even when in continuous use,
`thereby
`extending the life span of the lamp.
`
`because a transparent lens or cover allows the light emitted
`from LEDs to transmit
`therethrough without any color
`variation. Another drawback is that the external appearance
`of the lamp is marred by the LEDs remaining completely
`exposed to the outside through t_helens. A furt_hershortcom­
`ing resides in that the lamp is complicated in structure and
`costly to manufacture because a separate cooling fa11l1asto
`be employed to forcibly dissipate the heat generated by the
`LEDs. Moreover, use of the cooling fan may lead to
`increased consumption of electric energy and generate addi­
`tional heat by itself, thus adversely affecting the surrounding
`components inclusive of LEDs.
`
`In addition to the disadvantages mentioned above,
`[0008]
`the front lightemng LED lamp of the ’l97 registration has a
`further problem in that the cormection or coupling between
`lamp components is too weak to provide an acceptable
`degree of hermetic seal, anti-vibration and waterproofing,
`which may result in reduced reliability and shortened life
`span of the lamp.
`
`SUMMARY Of TIIE INVENTION
`
`[0009] Taking into accotmt the above-noted and other
`problems inherent in the prior art lamps, it is an object ofthe
`present invention to provide a LED illumination lamp that
`can dissipate heat in a nattual air circulation manner, allow
`l.F.Ds to produce harmoni7cd decorative light of different
`colors, make the external appearance of the lamp simple by
`prohibiting the LEDs from exposure to the outside through
`a cover, decrease consumption of electric energy, and enjoy
`compact overall configuration.
`[0010] Another object of the present invention is to pro­
`vide a LED illumination lamp that has an improved effect of
`hermetic seal, anti-vibration and waterproofing between a
`base, a LED module and a cover, thereby assuring increased
`reliability and prolonged life span of the lamp.
`[0011] With these objects in view, the present invention
`provides a LED illumination lamp, comprising: a body
`adapted to be placed on or around an target illumination
`object, the body having a central bore with an internal fixture
`shoulder, a seat part provided around a top end of the central
`bore. a plurality of support ears formed along a periphery of
`the body at a predetermined spacing, a plurality of heat
`radiation fins disposed in between the support ears substan­
`tially at an equal spacing and a plurality of air vents formed
`at one side ofeach of the support ears for allowing air to flow
`and circulate through the air vents; a LED module having a
`printed circuit board aflixed to the intemal fixture shoulder
`of the body, a group of LEDs attached to the printed circuit
`board and consisting of red LEDs, green LEDs and blue
`LEDs, and a11electric cable for supplying electric power to
`the LEDs and control signals to the printed circuit board; and
`a cover mounted on the seat part of the body, the cover
`having a semitransparent color-producing part capable of
`harmonizing colors of the light emitted trom the I.EDs and
`prohibiting the LED module from exposure to the outside
`and ar1 air passageway ir1 communication with interstices
`existing between the heat radiation fins of the body for
`permitting the heat generated from the LED module to
`dissipate to the outside.
`
`The front ligl1ter1ir1gLED lamp of the ’l97 regis­
`[0007]
`tration, however, poses a problem in that it is diflicult to
`illuminate an object with decorative light of different colors
`
`[0012] According to the LED illumination lamp of the
`present invention, the semitransparent color-producing part
`of the cover can hannonize the colors of the light emitted
`
`

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`US 2006/02 I5408 A 1
`
`Sep. 28, 2006
`
`from the I.EDs and illuminate a target object Withdecorative
`light of different colors. The heat can be dissipated in a
`natural air circulation manner Without having to use any
`separate cooling n1ea11s,thereby prolonging the life span of
`the la111p.The lamp is simple in construction and less costly
`to manufacture. The external appearance of the lamp
`becomes sleek and clean by prohibiting the LEDs fro111
`exposure to the outside through a cover. Removal of forced
`heat radiation means decreases consumption of electric
`energy. The base, the LED module and the cover are coupled
`together
`in such a manner as to assure hermetic seal.
`anti-vibration and waterproofing therebetween, thus increas­
`ing the reliability and prolonging the life span of the lamp.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[0013] The above a11dother objects, features and advan­
`tages of the present invention will become apparent from the
`following description of a preferred embodiment given in
`conjunction wit_hthe accompanying drawings, in which:
`[0014] FIGS.
`la and lb are exploded perspective view
`and cross-sectional view showing a prior art illumination
`lamp disclosed in Korean Utility Model Registration No. 20­
`0336197;
`
`[0015] FIG. 2 is an exploded perspective view illustrating
`a LED illumination lamp in accordance with the present
`invention;
`
`FIG. 3 is a perspective view of t_heLED illum_ina­
`[0016]
`tion lamp shown in FIG. 2, with their components coupled
`together;
`
`[0017] FIG. 4 is a front sectional view of the LED
`illumination lamp shown in FIG. 2;
`
`[0013] FIG. 5a is a partially enlarged sectional view of
`“a” part in FIG. 4, FIG. Sb is a partially enlarged sectional
`view taken along li11e“b-b” in FIG. 2, a11d FIG. 50 a
`partially enlarged sectional view of “c” part in FIG. 4: and
`
`[0019] FIG. 6 is a bottom Viewdepicting air circulation in
`the LED illumination lamp in accordance With the present
`invention.
`
`DETAILED DESCRIPTION OF THE
`INVENTION
`
`[0020] A preferred embodiment of a I.ED illumination
`lamp in accordance with the present invention Will now be
`described in detail with reference to the drawings attached.
`
`[0021] FIG. 2 is an exploded perspective view illustrating
`a LED illumination lamp in accordance with the present
`invention; FIG. 3 is a perspective view of the LED illumi­
`nation lamp shown in FIG. 2, with their components
`coupled together; FIG. 4 is a front sectional view of the LED
`illumination la111pshown in FIG. 2; FIGS. 5a, Sb and Sc are
`partially enlarged sectional views showing the structural
`relationship of a body, a LED module and a cover; and FIG.
`6 is a bottom view depicting air circulation i11the LED
`illumination lamp in accordance with the present invention.
`[0022] Referring to FIGS. 2 through 6, designated by
`reference numeral 10 is a body that can be placed or installed
`on or around a target illumination object. The body I0 may
`be produced by virtue of, e.g., die casting of aluminum
`which is lightweight and exhibits good performance of heat
`
`radiation. A so-called anode oxidation film is formed on the
`entire surface of t_hebody I0 through an anodizing process
`to prevent oxidation of the body and improve durability
`thereof.
`
`its center a bore IO11 of
`[0023] The body I0 l1as at
`predetermined diameter extending along a center axis X-X
`as best shown in FIG. 4. An amiular border part 11 protrudes
`i11a11upward direction generally in a llush relationship with
`the bore 10:1.Radially inwardly extending from the bore 10a
`is a fixture shoulder 12 that serves to support a printed circuit
`board ofa LED module set forth below. A plurality of fixing
`lugs 123 protrudes radially inwardly toward the center axis
`X-X, each of the fixing lugs 123 having a thread hole 122
`through which a bolt
`l2l
`is fastened to afiix the printed
`circuit board of the LED module.
`
`[0024] Formed below the fixture shoulder 12 is a support
`shoulder 13 that holds and supports a heat radiation plate
`described below. The support shoulder I3 is spaced apart
`from the fixture shoulder 12 and protrudes radially inwardly
`toward the center axis X-X with a predetermined width.
`Particularly,
`the support shoulder
`I3 has a cutout
`I31
`through which an electric cable for supplying electric cur­
`rent to the printed circuit board extends with no interference
`with the support shoulder I3 or the body I0. The support
`shoulder 13 is also provided with through-holes 132 for
`allowing bolts 133 to pass therethrough i11order to fasten the
`heat radiation plate in place.
`
`[0025] Five support ears 14 protrude radially outwardly
`from a11dare disposed along the periphery of the body 10 at
`an angular spacing of about 72 degrees. Formed on at least
`three of the support ears 14 are thread holes 142 through
`which bolts 141 are tightened to fasten the body 1|), i.e., the
`lamp in an appropriate position for illumination.
`
`[0026] A plurality of radially outwardly protruding heat
`radiation fins 15 are disposed in between the support ears 14
`so that they can dissipate the heat generated by the LEDs set
`forth below. The heat radiation fins I5 are spaced apart from
`one another substantially at an equal spacing (W), assuring
`that the ambient air can fiow and circulate through between
`the respective heat radiation fins I5 to t_herebycool down the
`body 10. Although the heat radiation fins 15 disposed
`between two neighboring support ears 14 are five in number
`i11t_hepresent embodiment,
`the number of the heat radiation
`fins 15 may be greater or smaller as far as the rigidity of the
`body is kept intact.
`
`[0027] On the top surface ofthe body l0, a planar seat part
`16 is provided between the annular border pm 11 and the
`top Sl.l1’f£1C6Sof the support ears 14 and the heat radiation fins
`I5 such that the below-noted cover can he stably placed on
`the seat part I6. The top surfaces ofthe support ears I4 and
`the heat radiation fins 15 are provided with step portions 14a
`and 15a which form the seat part I6. Formed on each of the
`step portions 14a of t_hesupport ears I4 is a thread hole I62
`with which a bolt 161 is threadedly engaged to fasten the
`below-mentioned cover in place.
`
`[0028] A plurality ofair vents I7 are formed at one side of
`each of the support ears 14 on the bottom side of the body
`10 for allowing the ambient air to fiow and circulate through
`the air vents I7 to t_hereby ediciently remove the heat
`generated by the LEDs. Although the air vents 17 are five in
`number a11ddisposed at one side of each of the support ears
`
`

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`US 2006/02 I5408 A 1
`
`Sep. 28, 2006
`
`l4 in the present embodiment. the number and position of
`the air vents 17 may be changed properly depending o11the
`size of the body and the environment of use of the lamp.
`[0029] Designated by reference numeral 20 is a LED
`module for producing light for illumination. The LED
`module 20 is provided with a printed circuit board 21 of
`circular configuration which is inserted within the annular
`border part 11. Formed through the printed circuit board 21
`are a number of through-l1oles 211, each of Which is aligned
`with the corresponding thread hole 122 ofthe fixing lugs 123
`on the fixture shoulder 12 ofthe body 10 so that the bolt 121
`can be inserted therethrough. No electric circuit is for111ed
`around the through-holes 211 of the printed circuit board 21
`to electrically isolate the board 21 from the bolt 121 and the
`body 10.
`[0030] A group of LEDs 22 is attached to the printed
`circuit board 21. The group of LEDs 22 consists of red
`l.EDs, green l,F.Ds and blue LEDs Which are designed to
`produce decorative light of different colors. The group of
`LEDs 22 is preferably energized by electricity of less than
`12 W in order to save the electric energy a11dreduce the cost
`for illtunination.
`
`layer 23 of predetermined thickness is
`[0031] A coat
`provided on the top surface of the printed circuit board 21 of
`the LED module 20 for the sake of Waterproofing, insulation
`a11dlight reflection. The coat layer 23 can be fomied by way
`of fixedly securing the LED module 20 to the fixture
`shoulder 12 of the body 20 through the use of the bolt 121
`a11dthen applying coat material on the entire surface of the
`printed circuit board 21. Preferably, White epoxy is used as
`the coat material for the coat
`layer 23 so that the light
`emitted from the group of LEDs can be refiected With an
`increased illuminancc.
`
`[0032] Moreover, an insulation film 24 is bonded to the
`rear surface of the printed circuit board 21 of the LED
`module 20 for insulating the printed circuit board 21 fro111
`the body 10, while blocking and absorbing extemal shocks
`to protect the LED module 20. The insulation film 24 is
`made of such insulating materials as polyamide, polyester,
`polyimide, glass epoxy and the lil-:c, which can provide
`effective insulation, increased light transmissivity and easy
`extrusion and injection.
`[0033] A heat radiation plate 25 ofexcellcnt heat conduc­
`tivity is attached to the bottom surface of the printed circuit
`board 21 so that the heat generated from the group of LEDs
`22 ca11be conducted to the outside through the heat radiation
`plate 25. The heat radiation plate 25 has insert holes 251
`formed in alignment With the through-holes 132 of the
`support shoulder 13 a11dcan be secured to the support
`shoulder 13 of the body 10 by tightening the bolt 132
`through the insert holes 251 and the through-holes 132.
`[0034] Comiected to printed circuit board 21 is an electric
`cable 26 through Which electric current is supplied to the
`printed circuit board 21 and the group of LEDs 22. The
`electric cable 26 is also coupled to a controller (not shown)
`that serves to control the operation ofthe group ot'l.EDs 22
`in a predeten11i11edmanner. The electric cable 26 extends to
`the outside through the cutout 131 of the support shoulder 13
`a11done of the air ve11ts17 adjacent
`to the cutout 131 With
`no interference with the body 10.
`[0035] Designated by reference numeral 30 is a cover that
`functions to shield the top portion of the body 10 and the
`
`LED module 20 and has the capability of harmonizing the
`li@t emitted from the group of LEDs 22 to produce deco­
`rative light of different colors. The cover 30 may be made of,
`e.g., polycarbonate. wl1ich has increased durability and ca11
`prevent the cover 30 from damage by external shocks and
`positively protect the group of LEDs 22.
`[0036]
`ln particular, the cover 30 is adapted to harmonize
`the lights of red (R). green (G) and blue (B) colors, wl1icl1
`are emitted fro111the goup of LEDs 22 under a given
`program, and produce decorative light of different color
`combination to provide desired illumination. The cover 30 is
`provided with a se111itransparent color-producing part 31 that
`can prevent scattering of light to lessen the eye strain and
`prohibit the group of LEDs 22 and other components from
`exposure to the outside in an effort not to mar the aesthetic
`appearance and the feeling of texture of the cover 30. It
`Would be preferred that
`the color-producing part 31 is
`formed through the use of a mold Whose surface is treated
`by sanding, knurling or sandblasting.
`[0037] The color-producing part 34 of the cover 30 is
`provided 011its bottom side With a vertically downWardly
`extending cylindrical protrusion 34 corresponding to the
`armular border part 11 of the body 10. The cylindrical
`protrusion 34 has a gasket 341 Whose cross-section is of
`“U”-shape so that it can be firmly held in place by the
`cylindrical protrusion 34. The gasket 341 is kept i11pressur­
`ized sealing contact with the border part 11 of the body 10
`to provide the cfiect of gas-proofing, Water-proofing and
`anti-vibration.
`
`[0038] The cover 30 is provided on its bottom periphery
`With an edge rim 38 that makes close contact With the seat
`part 16 of the body l0 and the step portions 14a , l5a of the
`support ears 14 and the heat radiation [ins 15. A reception
`groove 35 is formed along a bottom end of the edge rim 38
`of the cover 30 and a110-shaped seal ring 351 is fitted to the
`reception goove 35,
`the seal ring 351 making air-tight
`contact With the seat part 16 of the body 10.
`[0039] The cover 30 has a plurality of fastening parts 36
`disposed along a periphery of the cover 30. Each of the
`fastening parts 36 cooperates with a bolt 161 to fasten the
`cover 30 to the body 10 and consists of a guide recess 361
`for receiving and guiding the bolt 161 and a through-l1ole
`362 adjoining to the guide recess 361 and in alignment with
`the thread hole 162 fonned through the seat part 16 of the
`body 10 for allowing the bolt 161 to be inserted there­
`through.
`[0040] An air passageway 37 is formed in the vicinity of
`the scat part l6 of the body l0 and remains in communica­
`tion With inter