WO2015146621A1 - 発光デバイス - Google Patents

発光デバイス Download PDF

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Publication number
WO2015146621A1
WO2015146621A1 PCT/JP2015/057435 JP2015057435W WO2015146621A1 WO 2015146621 A1 WO2015146621 A1 WO 2015146621A1 JP 2015057435 W JP2015057435 W JP 2015057435W WO 2015146621 A1 WO2015146621 A1 WO 2015146621A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
fluorescent member
emitting device
cooling medium
light
Prior art date
Application number
PCT/JP2015/057435
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
寛之 清水
隆史 西宮
義正 山口
角見　昌昭
忠仁 古山
Original Assignee
日本電気硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Publication of WO2015146621A1 publication Critical patent/WO2015146621A1/ja

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/16—Cooling; Preventing overheating
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence

Definitions

  • the present invention relates to a light emitting device suitable for a projector.
  • a light emitting device using an LED (Light Emitting Diode) and a phosphor has been proposed.
  • a projector using a light emitting device including a light source that emits excitation light and a fluorescent member that includes a phosphor that converts excitation light from the light source into fluorescence has been proposed.
  • the phosphor when a high-output light source is used as the light source, the phosphor generates heat due to the irradiation of excitation light, and the temperature of the fluorescent member rises. When the temperature of the phosphor rises, problems such as a decrease in emission intensity occur.
  • Patent Documents 1 to 5 it is possible to improve heat dissipation by providing the fluorescent member with a heat sink having high thermal conductivity, a heat radiating fin, or an uneven structure for heat radiating. Proposed.
  • JP 2012-169049 A JP 2001-142146 A JP 2002-90886 A JP 2003-156996 A JP 2011-186350 A
  • the above conventional technique has a problem that the temperature rise of the phosphor cannot be efficiently suppressed.
  • An object of the present invention is to provide a light emitting device capable of efficiently suppressing a temperature rise of a phosphor in a fluorescent member.
  • the light emitting device of the present invention includes a light source that emits excitation light, a fluorescent member that emits fluorescence when incident excitation light from the light source, a cooling medium in which the fluorescent member is immersed, a container that stores the cooling medium, and a container A cooling mechanism for cooling the cooling medium, the container having an incident part for allowing excitation light from the light source to enter the inside of the container, and an emission for emitting the fluorescence from the fluorescent member to the outside of the container Part.
  • the cooling mechanism may cool the cooling medium by circulating the cooling medium.
  • the incident part may have a lens function of condensing excitation light and irradiating the fluorescent member.
  • the emission unit may have a lens function of collecting and emitting fluorescence.
  • the fluorescent member may be a reflective fluorescent member or a transmissive fluorescent member.
  • Examples of the reflective fluorescent member include those having a reflective layer and a phosphor layer provided on the reflective layer.
  • the temperature rise of the phosphor in the fluorescent member used for the light emitting device can be efficiently suppressed.
  • FIG. 1 is a schematic cross-sectional view showing a light emitting device according to a first embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view showing a light emitting device according to a second embodiment of the present invention.
  • FIG. 3 is a schematic cross-sectional view showing a light emitting device according to a third embodiment of the present invention.
  • FIG. 4 is a schematic cross-sectional view showing a light emitting device according to a fourth embodiment of the present invention.
  • FIG. 5 is a schematic cross-sectional view showing a light emitting device according to a fifth embodiment of the present invention.
  • FIG. 6 is a schematic cross-sectional view showing a light emitting device according to a sixth embodiment of the present invention.
  • FIG. 1 is a schematic cross-sectional view showing a light emitting device according to a first embodiment of the present invention.
  • the light emitting device 1 includes a light source 20 that emits excitation light 2, a fluorescent member 10 that emits fluorescence 3 when the excitation light 2 from the light source 20 is incident, a cooling medium 4 in which the fluorescent member 10 is immersed, and a cooling medium 4.
  • a container 30 to be housed and a cooling mechanism 40 that is connected to the container 30 and cools the cooling medium 4 are provided.
  • the cooling mechanism 40 that circulates and cools the cooling medium 4 includes a radiator 41, a pump 42, a cooling fan 43, and pipes 44, 45, and 46.
  • the pipe 44 and the pipe 46 are connected to the container 30.
  • One end of the pipe 44 is connected to the container 30, and the other end is connected to the radiator 41.
  • One end of the pipe 46 is connected to the container 30, and the other end is connected to the pump 42.
  • One end of the pipe 45 is connected to the pump 42, and the other end is connected to the radiator 41.
  • the radiator 41 is cooled by a cooling fan 43.
  • As the cooling medium 4 a colorless and transparent medium such as water, ethylene glycol, or antifreeze is preferably used.
  • the cooling medium 4 in the container 30 passes through the pipe 44 and is supplied to the radiator 41.
  • the radiator 41 is cooled by a cooling fan 43, and the cooling medium 4 supplied to the radiator 41 is cooled.
  • the cooling medium 4 cooled by the radiator 41 passes through the pipe 45 and is sent to the pump 42.
  • the cooling medium 4 sent to the pump 42 is returned to the container 30 through the pipe 46.
  • the cooling medium 4 in the container 30 is sent to the cooling mechanism 40, cooled by the cooling mechanism 40, and then returned to the container 30.
  • the fluorescent member 10 is immersed in the cooling medium 4 accommodated in the container 30 and is cooled by the cooling medium 4.
  • the fluorescent member 10 is held in the container 30 by a holding member (not shown).
  • the fluorescent member 10 includes a reflective layer 12 and a phosphor layer 11 provided on the reflective layer 12.
  • the reflective layer 12 include metal films such as silver, aluminum, and platinum, and dielectric multilayer films.
  • the dielectric multilayer film is a film composed of a laminate of a high refractive index film and a low refractive index film, and can selectively reflect light having a specific wavelength.
  • the phosphor layer 11 is not particularly limited as long as it includes a phosphor.
  • Examples of the phosphor layer 11 include those composed of a glass matrix and phosphors dispersed therein.
  • the phosphor is not particularly limited as long as it emits fluorescence when incident excitation light is incident.
  • Specific examples of the phosphor include, for example, an oxide phosphor, a nitride phosphor, an oxynitride phosphor, a chloride phosphor, an acid chloride phosphor, a sulfide phosphor, an oxysulfide phosphor, and a halide.
  • examples thereof include inorganic phosphors such as phosphors, chalcogenide phosphors, aluminate phosphors, halophosphate phosphors, and garnet compound phosphors.
  • the glass matrix is not particularly limited as long as it can be used as a phosphor dispersion medium.
  • borosilicate glass or phosphate glass can be used.
  • the softening point of the glass matrix is preferably 250 ° C. to 1000 ° C., more preferably 300 ° C. to 850 ° C.
  • the container 30 has an incident part 31 for causing the excitation light 2 from the light source 20 to enter the inside of the container 30 and an emission part 32 for emitting the fluorescence 3 from the fluorescent member 10 to the outside of the container 30.
  • a light source 20 and a condenser lens 21 are provided outside the container 30 so that the phosphor layer 11 of the fluorescent member 10 is irradiated with the excitation light 2.
  • Specific examples of the light source 20 include an LED light source and a laser light source.
  • the excitation light 2 emitted from the light source 20 is collected by the condenser lens 21, passes through the incident portion 31 of the container 30, and enters the phosphor layer 11 of the fluorescent member 10.
  • the excitation light 2 incident on the phosphor layer 11 excites the phosphor in the phosphor layer 11 and emits fluorescence 3 from the phosphor.
  • a part of the fluorescence 3 is reflected by the reflection layer 12 and is emitted from the phosphor layer 11.
  • a part of the fluorescence 3 is emitted directly from the phosphor layer 11.
  • the fluorescence 3 emitted from the phosphor layer 11 passes through the emission part 32 and is emitted to the outside of the container 30.
  • the fluorescence 3 emitted to the outside of the container 30 is emitted from the light emitting device 1 of the present embodiment.
  • the incident part 31 and the emission part 32 of the container 30 are made of a material that transmits the excitation light 2 and the fluorescence 3. Examples of such a material include glass and transparent resin.
  • the antireflection layer 51 is formed on the outside of the wall portion of the container 30 where the incident portion 31 and the emission portion 32 are formed, and the antireflection layer 52 is formed on the inside.
  • the antireflection layers 51 and 52 for example, a dielectric multilayer film composed of a laminate of a high refractive index film and a low refractive index film, an antireflection structure (moth eye structure) film formed by a nanoimprint method, or the like is used. Can be used.
  • the excitation light 2 is applied to the phosphor layer 11 of the fluorescent member 10, and the fluorescence 3 is emitted from the phosphor layer 11 of the fluorescent member 10.
  • the phosphor layer 11 generates heat by irradiation with the excitation light 2
  • the cooling medium 4 is cooled by the cooling mechanism 40 as described above, the fluorescent member 10 can be cooled by the cooling medium 4 that is always cooled.
  • FIG. 2 is a schematic cross-sectional view showing a light emitting device according to a second embodiment of the present invention.
  • the phosphor layer 11 of the fluorescent member 10 is closely attached to the wall portion of the container 30 in which the incident portion 31 and the emission portion 32 are formed. Since other than that is the same as that of 1st Embodiment, description is abbreviate
  • the cooling medium 4 is not interposed between the phosphor layer 11 and the incidence part 31 and the emission part 32. For this reason, when the excitation light 2 is incident on the phosphor layer 11 and when the fluorescence 3 is emitted from the phosphor layer 11, the excitation light 2 is caused by the refractive index difference between the phosphor layer 11 and the cooling medium 4. And the fluorescence 3 can be prevented from reflecting on the surface of the phosphor layer 11. For this reason, the fall of emitted light intensity can be suppressed.
  • the temperature rise of the phosphor in the fluorescent member 10 can be suppressed.
  • FIG. 3 is a schematic cross-sectional view showing a light emitting device according to a third embodiment of the present invention.
  • a transmissive fluorescent member 10 is used.
  • the transmissive fluorescent member 10 include a transparent substrate made of glass or resin and a phosphor layer formed on the transparent substrate.
  • a transparent substrate made of glass or resin
  • a phosphor layer formed on the transparent substrate.
  • the transmissive fluorescent member 10 a fluorescent material dispersed in a glass or resin matrix may be used without using a transparent substrate.
  • the light source 20 and the condenser lens 21 are arranged on one side of the container 30, and the condenser lens 22 is arranged on the other side of the container 30.
  • the excitation light 2 emitted from the light source 20 is collected by the condenser lens 21, passes through the incident portion 31 of the container 30, and enters the fluorescent member 10.
  • the fluorescent light in the fluorescent member 10 is excited by the incident excitation light 2 and the fluorescent light 3 is emitted from the fluorescent material.
  • the fluorescence 3 emitted from the fluorescent member 10 passes through the emission part 32 and is emitted to the outside of the container 30.
  • the fluorescence 3 emitted to the outside of the container 30 is collected by the condenser lens 22 and emitted from the light emitting device 1 of the present embodiment.
  • the incident part 31 and the emission part 32 of the container 30 are made of a material that transmits the excitation light 2 and the fluorescence 3.
  • antireflection layers 51 and 52 are formed on the outside and inside of the incident portion 31, respectively, and antireflection layers 53 and 54 are formed on the inside and outside of the emission portion 32, respectively.
  • the temperature rise of the phosphor in the fluorescent member 10 can be suppressed.
  • FIG. 4 is a schematic cross-sectional view showing a light emitting device according to a fourth embodiment of the present invention.
  • the incident part 31 and the emission part 32 of the container 30 are formed in the shape of a convex lens. Thereby, the incident part 31 and the emission part 32 have a lens function. Therefore, the incident part 31 can collect the excitation light 2 and irradiate the fluorescent member 10.
  • the emitting unit 32 can collect the fluorescence 3 and emit it outside the container 30.
  • the antireflection layers 51 and 52 are provided on the outer side and the inner side of the incident part 31, respectively.
  • Antireflection layers 53 and 54 are provided on the inner side and the outer side of the emission part 32, respectively.
  • the entrance part 31 and the exit part 32 each have a lens function, it is not necessary to provide a condensing lens separately. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
  • the temperature rise of the phosphor in the fluorescent member 10 can be suppressed.
  • FIG. 5 is a schematic cross-sectional view showing a light emitting device according to a fifth embodiment of the present invention.
  • the incident part 31 and the emission part 32 of the container 30 are formed so as to swell outwardly in a hemispherical shape.
  • the inner medium is the cooling medium 4 having a refractive index higher than that of air
  • the incident part 31 and the emission part 32 having the above-described shapes have a lens function. Have. Therefore, the incident part 31 can collect the excitation light 2 and irradiate the fluorescent member 10.
  • the emitting unit 32 can collect the fluorescence 3 and emit it outside the container 30.
  • the antireflection layers 51 and 52 are provided on the outer side and the inner side of the incident part 31, respectively.
  • Antireflection layers 53 and 54 are provided on the inner side and the outer side of the emission part 32, respectively.
  • the entrance part 31 and the exit part 32 each have a lens function as in the fourth embodiment, it is not necessary to provide a condensing lens separately. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
  • the temperature rise of the phosphor in the fluorescent member 10 can be suppressed.
  • FIG. 6 is a schematic cross-sectional view showing a light emitting device according to a sixth embodiment of the present invention.
  • the entrance portion 31 and the exit portion 32 of the container 30 are formed in the shape of a convex lens.
  • the incident part 31 and the emission part 32 have a lens function. Therefore, the incident part 31 can collect the excitation light 2 and irradiate the fluorescent member 10.
  • the emitting unit 32 can collect the fluorescence 3 and emit it outside the container 30.
  • the antireflection layers 51 and 52 are provided on the outer side and the inner side of the incident part 31, respectively.
  • Antireflection layers 53 and 54 are provided on the inner side and the outer side of the emission part 32, respectively.
  • the entrance part 31 and the exit part 32 each have a lens function as in the fourth embodiment, it is not necessary to provide a condensing lens separately. Since other configurations are the same as those of the third embodiment, description thereof is omitted.
  • the temperature rise of the phosphor in the fluorescent member 10 can be suppressed.
  • the incident portion 31 and the emission portion 32 are formed in the shape of a convex lens.
  • the incidence portion 31 and the emission portion 32 are formed in a hemispherical shape on the outside. It may be formed so as to swell.
  • the cooling mechanism 40 configured to circulate and cool the cooling medium 4 including the radiator 41, the pump 42, the cooling fan 43, and the pipes 44, 45, and 46 has been described as an example. Is not limited to this.
  • the cooling mechanism 40 may be any mechanism that can cool the cooling medium 4 in the container 30.
  • the light-emitting device of the present invention can be used not only for projectors but also for in-vehicle lighting applications such as headlamps and other lighting applications.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Projection Apparatus (AREA)
PCT/JP2015/057435 2014-03-24 2015-03-13 発光デバイス WO2015146621A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014060096A JP2015184434A (ja) 2014-03-24 2014-03-24 発光デバイス
JP2014-060096 2014-03-24

Publications (1)

Publication Number Publication Date
WO2015146621A1 true WO2015146621A1 (ja) 2015-10-01

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JP (1) JP2015184434A (zh)
TW (1) TW201539106A (zh)
WO (1) WO2015146621A1 (zh)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018092846A1 (ja) 2016-11-17 2018-05-24 三菱電機株式会社 発光装置、電子機器、照明装置および車両用前照灯

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008309877A (ja) * 2007-06-12 2008-12-25 Seiko Epson Corp 光源装置及びプロジェクタ
JP2009086148A (ja) * 2007-09-28 2009-04-23 Sanyo Electric Co Ltd プロジェクタ及びプロジェクタ用光学モジュール
JP2010197500A (ja) * 2009-02-23 2010-09-09 Casio Computer Co Ltd 発光装置及び光源装置並びにこの光源装置を用いたプロジェクタ
JP2010218840A (ja) * 2009-03-16 2010-09-30 Casio Computer Co Ltd 発光装置及び光源装置並びにこの光源装置を用いたプロジェクタ
JP2011075657A (ja) * 2009-09-29 2011-04-14 Casio Computer Co Ltd 光変換装置、光源ユニット及びプロジェクタ
JP2012078707A (ja) * 2010-10-05 2012-04-19 Seiko Epson Corp 光源装置及びプロジェクター
JP2012181309A (ja) * 2011-03-01 2012-09-20 Seiko Epson Corp 回転ホイール光学システム、およびプロジェクター
JP2014503937A (ja) * 2010-11-09 2014-02-13 オスラム ゲーエムベーハー 蛍光要素と光学システムとを伴う蛍光アセンブリ

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008309877A (ja) * 2007-06-12 2008-12-25 Seiko Epson Corp 光源装置及びプロジェクタ
JP2009086148A (ja) * 2007-09-28 2009-04-23 Sanyo Electric Co Ltd プロジェクタ及びプロジェクタ用光学モジュール
JP2010197500A (ja) * 2009-02-23 2010-09-09 Casio Computer Co Ltd 発光装置及び光源装置並びにこの光源装置を用いたプロジェクタ
JP2010218840A (ja) * 2009-03-16 2010-09-30 Casio Computer Co Ltd 発光装置及び光源装置並びにこの光源装置を用いたプロジェクタ
JP2011075657A (ja) * 2009-09-29 2011-04-14 Casio Computer Co Ltd 光変換装置、光源ユニット及びプロジェクタ
JP2012078707A (ja) * 2010-10-05 2012-04-19 Seiko Epson Corp 光源装置及びプロジェクター
JP2014503937A (ja) * 2010-11-09 2014-02-13 オスラム ゲーエムベーハー 蛍光要素と光学システムとを伴う蛍光アセンブリ
JP2012181309A (ja) * 2011-03-01 2012-09-20 Seiko Epson Corp 回転ホイール光学システム、およびプロジェクター

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TW201539106A (zh) 2015-10-16
JP2015184434A (ja) 2015-10-22

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