as) United States
`a2) Patent Application Publication co) Pub. No.: US 2015/0138780 Al
` YOSHIZAWAetal. (43) Pub. Date: May 21, 2015
`
`
`
`US 20150138780A1
`
`(54) DILLUMINATION DEVICE
`
`Publication Classification
`
`(71) Applicant: Mitsubishi Chemical Corporation,
`Chiyoda-ku (JP)
`
`(72)
`
`Inventors: Kouta YOSHIZAWA,Tokyo (JP);
`Toshihiko KURIYAMA, Kanagawa
`(JP); Akeo KASAKURA,Tokyo (JP);
`Yuki KOHARA,Tokyo (JP); Toru
`TAKEDA,Tokyo (JP)
`,
`,
`a,
`,
`.
`(73) Assignee: Mitsubishi Chemical Corporation,
`Chiyoda-ku (JP)
`
`(21) Appl. No.: 14/606,108
`
`(22)
`
`Filed:
`
`Jan. 27, 2015
`
`oo
`Related U.S. Application Data
`(63) Continuation ofapplication No. PCT/JP2013/069166,
`filed on Jul. 12, 2013.
`
`(30)
`
`Foreign Application Priority Data
`
`Jul. 31,2012
`
`(IP) woe eeeeeceseeeecteeees 2012-169891
`
`(51)
`
`Int. Cl.
`F21V 29/83
`F21V 5/04
`F21V 29/60
`(52) U.S. CL.
`CPC vieceeccecceeses F21V 29/83 (2015.01); F21V 29/60
`(2015.01); F21V 5/04 (2013.01)
`
`(2006.01)
`(2006.01)
`(2006.01)
`
`(57)
`
`ABSTRACT
`
`The illumination device includes: a case; a heat sink which
`has a bottom part in which an LED moduleis installed, a
`cylindrical wall part standing upright from the bottom part
`and disposed such that a clearance is created between the
`cylindrical wall part and an inner wall surface ofthe case, and
`an open end formed at the front end of the cylindrical wall
`part; a fan which is housed in the case; an air intake passage
`which guidesto the fan, air introduced from the lateral side of
`the case into the case; and an air discharge passage whichis
`formed along the outer surface of the bottom part and the
`outer wall surface of the cylindrical wall part in the heat sink
`and dischargesthe air sent from the fan from the front endside
`
`Petitioner Ensign
`Exhibit 1022 - Page 1 of 32
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`of the heat sink to the outside.
`
`Petitioner Ensign
`Exhibit 1022 - Page 1 of 32
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`

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`Patent Application Publication May 21,2015 Sheet 1 of 19
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`US 2015/0138780 Al
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`FIG. /
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`
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`Patent Application Publication May 21,2015 Sheet 2 of 19
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`Patent Application Publication
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`May 21, 2015 Sheet 3 of 19
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`US 2015/0138780 Al
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`FIG. 3
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`Petitioner Ensign
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`NoeSS
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`
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`

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`Patent Application Publication May 21,2015 Sheet 4 of 19
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`US 2015/0138780 Al
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`FIG. 4
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`
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`Patent Application Publication
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`May 21, 2015 Sheet 5 of 19
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`US 2015/0138780 Al
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`FI
`
`G5
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`
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`Patent Application Publication May 21,2015 Sheet 6 of 19
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`US 2015/0138780 Al
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`FIG. 6
`
`Al,
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`Patent Application Publication May 21,2015 Sheet 7 of 19
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`US 2015/0138780 Al
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`FIG. /
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`Patent Application Publication May 21,2015 Sheet 8 of 19
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`US 2015/0138780 Al
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`FIG. 8
`
`
` * etLRN secenis
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`52
`
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`Patent Application Publication May 21,2015 Sheet 9 of 19
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`US 2015/0138780 Al
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`FIG. 9
`
`46
`
`46
`
`42, 422
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`Patent Application Publication May 21,2015 Sheet 10 of 19
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`US 2015/0138780 Al
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`FIG. 10
`
`
`
`
`AWON
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`Patent Application Publication May 21,2015 Sheet 11 of 19
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`US 2015/0138780 Al
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`FIG. 11
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`
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`422
`
`
`
`41 51.52 1!
`
`5
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`Patent Application Publication May 21,2015 Sheet 12 of 19
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`FIG. 12
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`
`
`461
`
`461
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`Patent Application Publication May 21,2015 Sheet 13 of 19
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`Patent Application Publication May 21,2015 Sheet 14 of 19
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`US 2015/0138780 Al
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`FIG. 14
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`Patent Application Publication May 21, 2015 Sheet 15 of 19
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`US 2015/0138780 Al
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`FIG. 15
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`SET~
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`Patent Application Publication May 21,2015 Sheet 16 of 19
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`US 2015/0138780 Al
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`FIG. 16
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`
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`Patent Application Publication May 21,2015 Sheet 17 of 19
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`US 2015/0138780 Al
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`FIG. 17
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`Patent Application Publication May 21,2015 Sheet 18 of 19
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`US 2015/0138780 Al
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`FIG. 18
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`
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`Patent Application Publication May 21,2015 Sheet 19 of 19
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`US 2015/0138780 Al
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`FIG. 19
`
`FAN CONTROL PART
`
`
`
`
`
`TEMPERATURE SENSOR
`
`
`3
`
`32
`
`17
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`US 2015/0138780 Al
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`May 21, 2015
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`ILLUMINATION DEVICE
`
`CROSS-REFERENCE TO RELATED
`APPLICATION
`
`[0001] This application is a continuation application of
`International Application PCT/JP2013/069166 filed on Jul.
`12, 2013 and designated the U.S., (and claims priority from
`Japanese Patent Application 2012-169891 which wasfiled on
`Jul. 31, 2012,) the entire contents of which are incorporated
`herein by reference.
`
`TECHNICAL FIELD
`
`[0002] The present invention relates to an illumination
`device.
`
`BACKGROUND ART
`
`[0003] Various illumination devices have been developed
`which use a high-efficiency and long-life LED (Light-emit-
`ting Diode) instead of a commonlampfitting such as a halo-
`gen lamp. As such an illumination device, for example, a
`device having an LED module, constituted of a package of an
`LED mounted ona substrate,fitted in a metal heat sink and a
`base fitted in this heat sink through a case (enclosure) is
`widely used in practical applications. When the temperature
`of the LED becomeshigh due to the heat generated from the
`LED,the luminousefficiency of the LED degrades, resulting
`in problems such as a decrease in the light output of the
`illumination device or shortening of the service life of the
`LED. In addition, since the lens constituting the illumination
`device is in most cases madeofresin, the lens may be dam-
`aged due to heat generation of the LED. It
`is therefore
`required in this type of illumination deviceto efficiently dis-
`sipate the heat generated from the LED.
`[0004]
`For commonlampfittings such as halogen lamps,
`standards(e.g., 07527-JIS-6320-2) specifying the maximum
`outer diameter, the total length,etc. are in place. Accordingly,
`when a halogen lampis to be replaced by an LED illumination
`device, the maximum outer diameter, the total length, etc. of
`the illumination device are required to conform to the existing
`standards, which makesit difficult in reality to provide a large
`heat sink. Meanwhile, in recent years, an illumination device
`having a so-called active cooling function in which a fan for
`cooling an LED is installed inside the case to forcibly cool the
`LED has been proposed.
`[0005]
`Patent Document 1: Japanese Patent No. 4757480
`[0006]
`Patent Document 2: Japanese National Publication
`of International Patent Application No. 2010-541152
`[0007]
`Patent document 3: Japanese National Publication
`of International Patent Application No. 2012-509571
`[0008]
`Patent document4: Japanese Patent Laid-Open No.
`2010-86713
`
`Patent document5: Japanese Patent Laid-Open No.
`[0009]
`2011-165351
`
`[0010]
`
`Patent document 6: Japanese Patent No. 4913259
`
`SUMMARYOF INVENTION
`
`Technical Problem
`
`[0011] On the other hand, a one-core (single) LED module
`having an LED concentrated in the central part of the sub-
`strate has been recently used as an LED modulein practical
`applications. The one-core LED module has advantages in
`that light distribution of the illumination device is easy to
`
`control and that so-called multi-shadow (multiple shadow)is
`less likely to occur. However, performing active cooling of
`the LED while conforming the maximum outer diameter, the
`total length, etc. of the illumination device to the existing
`standards often involves the following inconveniences.
`[0012]
`For instance, in many of the conventionalillumina-
`tion devices which perform active cooling, an air intake port
`and an air dischargeport are disposed close to each other, and
`in this case, the warm air having been discharged from the air
`discharge port is suctioned again from the air intake port,
`which causes degradation of the LED cooling efficiency.
`Whenpriority is given to the layout design ofthe air intake
`passage or the air discharge passage in order to avoid such
`double suction oftheair, the freedom in mounting the LED on
`the substrate of the LED module is narrowed, and this has a
`negative effect in that the above-mentioned one-core LED
`module cannot be applied. Moreover, the basic performance
`required for an illumination device adopting this type of
`active cooling includes high LED coolingefficiency.
`[0013] The present invention is to solve the above-de-
`scribed problems, and has an object of providing an illumi-
`nation device which can improve the luminousefficiency.
`
`Solution to Problem
`
`In order to solve the above-described problems, an
`[0014]
`illumination device according to the present
`invention
`includes: a case having an open face on the front end side; a
`cylindrical closed-end heat sink which has a bottom part in
`which an LED module constituted of an LED mounted on a
`substrate is installed, a cylindrical wall part standing upright
`from the bottom part and disposed such that a clearance is
`created between the cylindrical wall part and an inner wall
`surfaceofthe case, and an open end formedat the front end of
`the cylindrical wall part, and which is fitted in the case such
`that the open endis located on the openface side of the case;
`a fan whichis housed in the case so as to face the outer surface
`ofthe bottom part in the heat sink and serves to cool the LED;
`an air intake passage which guides to the fan the air intro-
`duced from thelateral side ofthe case into the case; and an air
`discharge passage which is formedalong the outer surface of
`the bottom part and the outer wall surface of the cylindrical
`wall part in the heat sink and dischargesthe air sent from the
`fan from the front end side of the heat sink to the outside.
`
`[0015] According to the illumination device related to the
`above-described configuration, the outside air is introduced
`from thelateral side ofthe case main body, and the air warmed
`while cooling the LED is discharged from the front end side
`of the heat sink to the outside. In this way, the double suction
`of the warmed air having been once discharged from the
`illumination device being suctioned again can be avoided.In
`addition, since the air discharge passage is formed along the
`outer wall surface of the cylindrical wall part in the heat sink,
`the freedom canbesufficiently secured in the aspect in which
`the LED module is installed in the bottom part of the heat
`sink. That is, since the entire surface of the bottom part of the
`heat sink is available as the installation space of the LED
`module, it is possible, for example, to constitute a one-core
`type by disposing the LED module in the central part of the
`bottom part. Moreover, the air flowing through the air dis-
`charge passage removesthe heat of the heat sink also while
`flowing along the outer wall surface of the cylindrical wall
`part in the heat sink. Thus, a sufficient chance can be secured
`for the cooling air flowing through the air discharge passage
`
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`Exhibit 1022 - Page 21 of 32
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`May 21, 2015
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`multiple protruding parts which protrude from the outer sur-
`to come into contact with the heat sink, so that heat dissipa-
`face of the second protruding edgepart so as to abut on the
`tion from the heat sink can be further promoted.
`protruding edgepart of the second heat sink and which leave
`[0016] A through-hole penetrating the bottom part may be
`part of the clearance between the protruding edge part of the
`formed in the bottom part of the heat sink. According to this
`second heat sink and the second protruding edgepart as an air
`configuration, part of the air which is blown from the fan
`discharge port while coveringthe rest of the clearance. More-
`against the outersurface ofthe bottom part ofthe heat sink can
`over, of adjacent onesof the protrudingparts, a pair of oppo-
`be supplied through the through-hole to the side of the space
`site wall surfaces which extends from the second protruding
`where the LED module is housed. Thatis, it is possible to
`edge part of the heat sink toward the protruding edgepart of
`guide additionally part of the cooling air to the surface of the
`the second heat sink and forms oneoftheair discharge ports
`LED module anddirectly cool the LED with this air. There-
`maybeinclinedin the samedirection.In this case, the pair of
`fore, cooling of the LED is promoted and the cooling effi-
`opposite wall surfaces may beinclined in the circumferential
`ciency can be further enhanced.
`direction of the second protruding edgepart.
`[0017] When the through-hole is provided in the bottom
`[0021] As described above, the structure of the air dis-
`part of the heat sink as described above, the illumination
`charge port in the heat sink with the passage twisted in the
`device may further include a lens, which is fitted in the heat
`circumferential direction of the cylindrical wall part (second
`sink andhasalateral surface disposed so as to face the inner
`protruding edge part) has advantages in that the air is more
`wall surface ofthe cylindrical wall part such that a ventilation
`smoothly discharged from the air discharge port, and that the
`path is formed betweenthe lateral surface and the inner wall
`flow rate of the air discharged from the air discharge port can
`surface. In this case,part ofthe air sent from the fan toward the
`be increased. Asaresult, the supply amountofthe cooling air
`outer surface of the bottom part in the heat sink may be
`supplied from the fan to the heat sink increases, so that the
`discharged to the outside through the through-hole and the
`LED cooling efficiency can be enhanced.
`ventilation path. The illumination device thus configured can
`dischargethe air sent from the fan via the through-hole to the
`[0022]
`Inthe illumination device accordingtothefirst con-
`outside of the illumination device through the ventilation
`figuration example, the air outlet of the fan may be coupled
`path. Then, this ventilation path is discharged to the outside
`with the rear open endofthe division wall in the second heat
`from the open end provided on the front end side of the heat
`sink. The illumination device thus configured can prevent
`sink. It is therefore possible to prevent the warm air having
`collision between the air flowing through the air intake pas-
`been releasedto the outside through the ventilation path from
`sage andthe air sent out from the fan toward the bottom part
`of the heat sink. Therefore, the air from the fan can be effi-
`being taken into the illumination device again.It is also pos-
`sible to control an optical characteristic such as an angle of
`ciently guidedto the heat sink and the LED coolingefficiency
`light distribution.
`can be improved.
`[0018] The inner wall surface of the cylindrical wall part
`[0023]
`In a second configuration example related to the
`maybe formedasa reflector whichreflects the light generated
`illumination device, the heat sink may have: a collar part
`by the LED. The illumination device thus configured can
`which is formed on the open endside in the cylindrical wall
`control an optical characteristic such as an angle of light
`part and protrudes further to the lateral side than the other
`distribution. The extraction efficiency of the light generated
`portions; and an air discharge port which penetrates the collar
`by the LED can also be improved.
`part, wherein an intake port which communicateswiththe air
`intake passage may be formedata position of the outer wall
`[0019] Here, in a first configuration examplerelated to the
`surface ofthe case on the rearside ofthe position wheretheair
`illumination device,
`the illumination device may further
`outlet of the fan housedin the case is disposed. Also in such
`include a secondheat sink provided between the case and the
`a second configuration example, advantages similar to those
`heat sink, wherein: the second heat sink may havea division
`of the first configuration example can be provided. In addi-
`wall which dividesthe inside ofthe case, such that a clearance
`tion, in the second configuration example, the manufacturing
`is provided between the secondheat sink and the cylindrical
`cost of the illumination device can be further reduced since
`wall part as well as between the second heatsink and the inner
`the second heat sink is not essential for the configuration.
`wall surface of the case, while covering the cylindrical wall
`part of the heat sink, and a protruding edge part which is
`[0024] The air discharge port may be defined by a pair of
`formed by the front open endside of the division wall pro-
`wall surfaces along the radial direction of the collar part and
`truding furtherto the front side than the open face of the case;
`a pair of wall surfaces along the circumferential direction of
`a rear open endofthe division wall may be disposedso as to
`the collar part, and the pair of wall surfaces along the radial
`face an air outlet of the fan; the outside air is introduced from
`direction of the collar part may be inclined in the samedirec-
`the clearance created between the protruding edgepart of the
`tion. In this case, the pair of wall surfaces along the radial
`second heat sink and the front end edge part of the case, and
`direction of the collar part may be inclined in the circumfer-
`the introducedair is guided to the fan through the clearance
`ential direction ofthe collar part. Thus, the structure ofthe air
`between the inner wall surface of the case and the outer wall
`dischargeport in the heat sink with the passage twisted in the
`surface of the division wall; and the air from the fan is dis-
`circumferential direction of the cylindrical wall part (collar
`charged to the outside through the clearance between the
`part) has advantages in that the air is more smoothly dis-
`outer wall surface of the cylindrical wall part of the heat sink
`charged from the air discharge port, and that the flow rate of
`and the inner wall surface of the division wall.
`the air discharged from the air discharge port can be
`increased. As a result, the amountof the cooling air supplied
`from the fan to the heat sink increases, so that the LED
`cooling efficiency can be enhanced.
`[0025] The illumination device according to the present
`invention may include: a case which has an open face on the
`front end side; a cylindrical closed-end heat sink which has a
`
`Inthe illumination device accordingtothefirst con-
`[0020]
`figuration example, the heat sink may further have: a second
`protruding edge part which is formed by the open endside of
`the cylindrical wall part protruding further to the front side
`than the open face of the case and whichis disposed so as to
`face the protruding edge part of the second heat sink; and
`
`Petitioner Ensign
`Exhibit 1022 - Page 22 of 32
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`Petitioner Ensign
`Exhibit 1022 - Page 22 of 32
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`

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`US 2015/0138780 Al
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`May 21, 2015
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`bottom part in which an LED module constituted of an LED
`mounted on a substrate is installed, a cylindrical wall part
`standing upright from the bottom part and disposed such that
`aclearance is created betweenthe cylindrical wall part and an
`inner wall surface of the case, and an open end formedat the
`front end ofthe cylindrical wall part, and whichis fitted in the
`case suchthat the open endis located on the open faceside of
`the case; a fan which is housed in the case so as to face the
`outer surface of the bottom part in the heat sink and serves to
`cool the LED; a first ventilation path which communicates
`between the outside of the case on the lateral side and the fan;
`and a secondventilation path which if formed along the outer
`surface of the bottom part and the outer wall surface of the
`cylindrical wall part in the heat sink and which communicates
`between the fan and the front end-side outside ofthe heatsink,
`wherein the fan is disposed betweenthefirst ventilation path
`and the secondventilation path.In this case, the power source
`substrate may be disposedso as to be located on the rear end
`side of the illumination device and be cooled bythe air pass-
`ing throughthe first ventilation path.
`[0026] An illumination device according to the present
`invention includes: a case having an openface on the front end
`side; a cylindrical closed-end heat sink which has a bottom
`part in which an LED module constituted ofan LED mounted
`on a substrate is installed, a cylindrical wall part standing
`upright from the bottom part and disposed such that a clear-
`ance is created between the cylindrical wall part and an inner
`wall surface of the case, and an open end formedat the front
`end of the cylindrical wall part, and which1s fitted in the case
`such that the open endis located on the open face side of the
`case; a fan which is housedin the case so asto face the outer
`surface of the bottom part in the heat sink and serves to cool
`the LED; an air intake passage which is formed along the
`outer wall surface of the cylindrical wall part and the outer
`surface of the bottom part in the heat sink and guidestheair
`introduced from the front end side of the heat sink to the fan;
`and an air discharge passage which discharges the air sent
`from the fan from the lateral side of the case to the outside.
`
`[0027] The means for solving the problemsin the present
`invention can be used in combination as far as possible.
`
`Advantageous Effects of Invention
`
`[0028] According to the present invention, in an illumina-
`tion device which performsactive cooling of an LED using a
`fan, the freedom is secured in the aspect in which an LED
`module is installed, and moreover, it is possible to enhance
`the cooling efficiency while preventing the warm air having
`been once discharged from being suctioned again. Thus, an
`illumination device which can improve the luminouseffi-
`ciency can berealized.
`
`BRIEF DESCRIPTION OF DRAWINGS
`
`FIG. 1 is an outline perspective view of an illumi-
`[0029]
`nation device according to Embodiment1.
`[0030]
`FIG. 2 is an exploded perspective view ofthe illu-
`mination device according to Embodiment1.
`[0031]
`FIG. 3 is a cross-sectional view ofthe illumination
`device according to Embodiment1.
`[0032]
`FIG.4 is an outline perspective view ofa heat sink
`according to Embodiment1.
`[0033] FIG.5 is a transparent view ofthe heat sink accord-
`ing to Embodiment1.
`
`FIG.6 is a front view ofthe heat sink according to
`[0034]
`Embodiment1.
`
`FIG. 7 is a rear view of the heat sink according to
`[0035]
`Embodiment1.
`
`FIG. 8 is a cross-sectional view of the heat sink
`[0036]
`according to Embodiment1.
`[0037]
`FIG. 9 is a side view of the heat sink according to
`Embodiment1.
`
`FIG. 10 is a view illustrating an air flow in the
`[0038]
`illumination device according to Embodiment1.
`[0039]
`FIG. 11 is a cross-sectional view of a heat sink
`according to a modified example of Embodiment1.
`[0040]
`FIG. 12 is a view illustrating the structure of an air
`discharge port according to the modified example of Embodi-
`ment1.
`
`FIG. 13 is an outline perspective view of an illumi-
`[0041]
`nation device according to Embodiment2.
`[0042]
`FIG. 14 is an exploded perspective view oftheillu-
`mination device according to Embodiment2.
`[0043]
`FIG. 15 is across-sectional view alongthe line B-B
`of FIG. 13.
`
`FIG. 16 is a view illustrating a modified example of
`[0044]
`a heat sink according to Embodiment2.
`[0045]
`FIG. 17 is a cross-sectional view of an illumination
`device according to Embodiment3.
`[0046]
`FIG. 18 is a cross-sectional view of an illumination
`device according to Embodiment4.
`[0047]
`FIG. 191s ablock diagram depicting a configuration
`for controlling rotation ofthe fan.
`
`DESCRIPTION OF EMBODIMENTS
`
`In the following, embodiments for implementing
`[0048]
`the present invention will be described in detail as examples
`with reference to the drawings. It is intended that, unless
`otherwise described, the technical scope ofthe present inven-
`tion is not limited to the dimensions, material, and shape of
`the components andtheir relative arrangement, etc. described
`in these embodiments.
`
`Embodiment 1
`
`FIG. 1 is an outline perspective view of an illumi-
`[0049]
`nation device 1 according to Embodiment 1. FIG. 2 is an
`exploded perspective view of the illumination device 1
`according to Embodiment1. FIG. 3 is a cross-sectional view
`ofthe illumination device 1 according to Embodiment1. FIG.
`3 is a cross-sectional view along the line A-A of FIG. 1. The
`illumination device 1 includesa case 2, a fan 3, a heat sink 4,
`an LED module 5, a second heat sink 6, a lens 7, a fixing
`member8, etc. In this description, the side on whichthe lens
`7 for outputting the light emitted from the LEDto the outside
`is provided is defined as the “front side” of the illumination
`device 1, while the opposite side is defined as the “rearside”.
`In this embodiment, the description will be based on an
`example where the illumination device 1 is, for example, an
`MR16-type LED illumination device which can be replaced
`with an MR16-type halogen lamp having an outer diameter of
`approximately 50 mm.
`[0050] The case 2 is an enclosure which includes a case
`main body part 22 with an open face 21 formed on the front
`end side, and a substantially rectangular parallelepiped base
`part 23 which is provided on the rear endside ofthe case main
`body 22. The case 2 may be formed of a member, such as
`aluminum,having a goodheat dissipation property. The case
`
`Petitioner Ensign
`Exhibit 1022 - Page 23 of 32
`
`Petitioner Ensign
`Exhibit 1022 - Page 23 of 32
`
`

`

`US 2015/0138780 Al
`
`May 21, 2015
`
`main body 22 has a bowl shape which gradually increases in
`diameter from the base part 23 toward the open face 21.
`However, the shape of the case 2 is not limited to the above-
`mentioned example, and various shapes can be adopted.
`[0051] The heat sink 4 has a cylindrical closed-end shape
`(which canalso be called a bow] shape), and, for example,is
`formed of a metal material, such as aluminum, having a good
`heat dissipation property. FIGS. 4 to 9 are viewsillustrating
`the detailed configuration of the heat sink 4. FIG. 4 is an
`outline perspective view of the heat sink 4 and depicts a state
`of the heat sink 4 viewed obliquely from the front side. FIG.
`5 is a transparent view ofthe heatsink 4. FIG.6 is a front view
`ofthe heat sink 4. FIG.7 is a rear view ofthe heat sink 4. FIG.
`8 is a cross-sectional view of the heat sink 4. FIG. 9 is a side
`view ofthe heat sink 4. The heat sink 4 will be described with
`reference to FIG. 1 to FIG.9.
`
`which protrude to the lateral side of the cylindrical wall part
`42 are provided at regular intervals in the circumferential
`direction of the cylindrical wall part 42 in the edge part which
`forms the open end 43 of the cylindrical wall part 42.
`[0056] Here, the inner wall surface of the cylindrical wall
`part 42 in the heat sink 4 will be denoted by the reference
`numeral 421, while the outer wall surface will be denoted by
`the reference numeral 422. As depicted in FIG. 8, the inner
`wall surface 421 of the cylindrical wall part 42 stands verti-
`cally from the inner surface 411 of the bottom part 41. The
`lens 7 is housed andfitted in a region defined by the inner wall
`surface 421 ofthe heat sink 4 and the inner surface 411 of the
`
`bottom part 41. In FIG.8, the lens 7 indicated by the dotted
`hatching has a substantially truncated cone shape, andis, for
`example, formedof an acrylic resin. A recess 71 is formed in
`the surface of the lens 7 facing the inner surface 411 of the
`bottom part 41 in the heat sink 4 so that the lens 7 does not
`[0052] The heat sink 4 has a bottom part 41 in which the
`interfere with the LED 52. However, the shape, size, material,
`LED module5is installed (placed), a cylindrical wall part 42
`etc. of the lens 7 can be appropriately changed. In this
`standing upright from this bottom part 41, and an open end 43
`embodiment, the lens7 is a collective lens, and may be used,
`formed at the front end of this cylindrical wall part 42. As
`for example, for spot light applications, for example, by being
`depicted in FIG.3, the heat sink 4 is fitted in the case main
`adapted for narrow-angle light distribution. However, the
`body 22 such that the open end 43 is located in the case 2 on
`angle of light distribution of the lens 7 can be appropriately
`the open face 21 side of the case main body 22. The cylindri-
`changed, andthe applicationsofthe illumination device 1 are
`cal wall part 42 is disposed such that a clearance is created
`not limited to a specific purpose.
`between the cylindrical wall part and the inner wall surface
`[0057]
`In this embodiment, the outer diameterofa lateral
`221 of the case main body 22.
`surface 72 of the lens 7 is set to be smaller than the inner
`[0053] As depicted in FIG.4, the LED module5is installed
`diameter of the cylindrical wall part 42 in the heat sink 4. In
`in the bottom part 41 in the central part of its plane. Herein-
`this way, a ventilation path 9 is formed betweenthe lateral
`after, the surface of the bottom part 41 on which the LED
`surface 72 of the lens 7 and the inner wall surface 421 of the
`module 5 is loaded will be called an “inner surface 411”,
`cylindrical wall part 42 when the lens 7 is fitted in the heat
`while the surface on the opposite side shall be called an “outer
`sink 4. An emission part 73 which emits the light generated by
`surface 412”. As depicted in FIG. 4, the LED module 5
`includes an LED substrate 51 and an LED 52 mounted
`the LED 52 to the outside is formedin the front endpart ofthe
`lens 7. While the lens 7 has the largest outer diameter at the
`(loaded) on this LED substrate 51. In this embodiment, the
`LED module5constitutes a so-called one-core module which
`position of the emission part 73, even at this position of the
`emission part 73, aclearance is securedas the ventilation path
`has the LED 52 concentrated in the central part of the LED
`9 between the lateral surface 72 and the inner wall surface 421
`substrate 51. As depicted in FIG.4, the LED module 5 accord-
`of the cylindrical wall part 42, and the inside and the outside
`ing to this embodimenthas one LED 52 disposedat the center
`of the illumination device 1 are communicated.
`ofthe bottom part 41 ofthe heat sink 4. As depicted in FIG.4,
`the bottom part 41 of the heat sink 4 is flat. Thus, the flat
`bottom part 41 can be effectively used as the base for loading
`the LED module 5 on it, serving the purpose of building a
`one-core LED module. The LED substrate 51 is a metal-
`based substrate formed of a metal material, such as alumi-
`num, having a good heat dissipation property, or of an insu-
`lating material, etc. The LED module 5 comesinto thermal
`contact with the heat sink 4 and thereby dissipates the heat
`generated by the LED 52.
`[0054]
`In the bottom part 41 of the heat sink 4, multiple
`through-holes 44 penetrating the bottom part 41 are disposed
`around the LED module 5. In this embodiment, the multiple
`through-holes 44 are disposed at substantially regular inter-
`vals on the outer circumferential side in the bottom part 41 so
`as to surround the LED 52. However, the number of the
`through-holes 44 is not limited to a specific number, and a
`single through-hole 44 maybe disposedin the bottom part 41.
`In FIGS. 5 to 7 and 9, the LED module 5 is not depicted.
`[0055] As depicted in FIG. 5 and FIG. 7, multiple heat
`dissipating