WO2017077757A1 - 発光装置 - Google Patents
発光装置 Download PDFInfo
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- WO2017077757A1 WO2017077757A1 PCT/JP2016/073609 JP2016073609W WO2017077757A1 WO 2017077757 A1 WO2017077757 A1 WO 2017077757A1 JP 2016073609 W JP2016073609 W JP 2016073609W WO 2017077757 A1 WO2017077757 A1 WO 2017077757A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/16—Laser light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/17—Discharge light sources
- F21S41/173—Fluorescent light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/176—Light sources where the light is generated by photoluminescent material spaced from a primary light generating element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/36—Combinations of two or more separate reflectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/0008—Reflectors for light sources providing for indirect lighting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
- F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
- F21V9/35—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material at focal points, e.g. of refractors, lenses, reflectors or arrays of light sources
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0087—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/0239—Combinations of electrical or optical elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2101/00—Point-like light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/30—Semiconductor lasers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
- H01S5/0071—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping for beam steering, e.g. using a mirror outside the cavity to change the beam direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/022—Mountings; Housings
- H01S5/02208—Mountings; Housings characterised by the shape of the housings
- H01S5/02212—Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30
- H01S5/4025—Array arrangements, e.g. constituted by discrete laser diodes or laser bar
Definitions
- the present invention relates to a light emitting device, a lighting device, and a vehicle headlamp that emits fluorescence by irradiating excitation light onto a light irradiation surface in a phosphor portion.
- a light emitting diode (LED) light source or a semiconductor laser (LD) light source as an excitation light source, the excitation light emitted from these excitation light sources is applied to the light irradiation surface of the phosphor part including the phosphor.
- a light-emitting device that emits fluorescence when irradiated is conventionally known (see, for example, Patent Document 1).
- the light emitting device using the semiconductor laser light source can reduce the size (spot size) of the vertical section (spot) perpendicular to the optical axis direction of the excitation light, compared with the light emitting device using the light emitting diode light source.
- Luminance fluorescence can be obtained.
- the resonance length of the semiconductor laser is short and the emission part of the light emitted from the semiconductor laser element is extremely flat.
- Projection light on the light irradiation surface of the excitation light projected onto the light irradiation surface when irradiating the light irradiation surface in the phosphor portion is usually a long shape (specifically, an elliptical shape) It becomes.
- a light-emitting device using a semiconductor laser light source may be provided for a device that is required to obtain higher-intensity fluorescence, such as a lighting device such as a projector or a vehicle headlamp.
- the excitation light on the light irradiation surface is irradiated by irradiating the light irradiation surface with a plurality of excitation light so that the excitation light overlaps the light irradiation surface in the phosphor portion. It is possible to further increase the luminance of fluorescence in the overlapped portion (see, for example, FIG. 7 of Patent Document 2 and FIG. 9 of Patent Document 3).
- JP 2011-134619 A Japanese Patent No. 4124445 Japanese Patent Laying-Open No. 2015-65144
- FIG. 17 shows an excitation light L1 in a conventional configuration in which a plurality of excitation lights L1, L2, and L3 are irradiated on the light irradiation surface 120a so that the excitation light L1, L2, and L3 overlap the light irradiation surface 120a in the phosphor portion 120.
- L2, L3 is a schematic plan view of a state in which excitation light L1, L2, L3 overlaps on the light irradiation surface 120a when irradiated on the light irradiation surface 120a.
- W indicates the light irradiation direction of a set of laser light sources.
- the excitation light L1, L2, L3 is irradiated on the light irradiation surface 120a of the phosphor portion 120 and the excitation light L1, L2, L3 is long on the light irradiation surface 120a.
- the longitudinal directions of the shapes of the projection lights M1, M2, and M3 intersect (especially, evenly intersect as in the illustrated example)
- the portions where the excitation lights L1, L2, and L3 overlap on the light irradiation surface 120a becomes smaller, and the fluorescence light intensity decreases accordingly.
- the luminance of the fluorescence on the light irradiation surface 120a of the phosphor portion 120 can be sufficiently obtained. The fact is not.
- the present invention provides a light emitting device, an illuminating device, and a vehicle headlamp capable of improving the luminance of fluorescence on the light irradiation surface when irradiating the light irradiation surface of the phosphor portion with a plurality of excitation lights superimposed.
- the purpose is to provide.
- the present invention provides the following light emitting device, lighting device, and vehicle headlamp in order to solve the above-mentioned problems.
- a light emitting device includes a plurality of light source units each having a laser light source that emits excitation light, and a phosphor unit that emits fluorescence upon receiving the excitation light, and includes among the plurality of light source units
- the at least two light source units project the excitation light onto the light irradiation surface so that the excitation light overlaps the light irradiation surface when the excitation light is irradiated onto the light irradiation surface of the phosphor portion, respectively.
- the longitudinal direction of the long shape of the projection light on the light irradiation surface of light is configured to be parallel or substantially parallel to each other.
- an illumination device includes the light emitting device according to the present invention.
- a vehicle headlamp according to the present invention includes the light emitting device according to the present invention.
- the plurality of light source units are configured such that the longitudinal directions of all the projection light shapes are parallel or substantially parallel.
- a mode in which the longitudinal direction of the shape of the projection light is configured to be a horizontal direction or a substantially horizontal direction when the fluorescence is projected to the outside can be exemplified.
- the longitudinal direction of the shape of the projection light of the at least two light source units is configured to be parallel or substantially parallel to the light irradiation direction along the traveling direction of the excitation light to the light irradiation surface.
- the aspect currently performed can be illustrated.
- the longitudinal direction of the shape of the projection light of the at least two light source units is configured to be orthogonal or substantially orthogonal to the light irradiation direction along the traveling direction of the excitation light to the light irradiation surface. Can be illustrated.
- the longitudinal direction of the shape of the said projection light of the said at least 2 light source part may become diagonal with respect to the light irradiation direction along the advancing direction to the said light irradiation surface of the said excitation light.
- the at least two light source units can be exemplified as a pair of light source units each having the laser light source.
- the pair of light source units includes a light irradiation direction along a traveling direction of the excitation light of one light source unit to the light irradiation surface, and a light irradiation surface of the excitation light of the other light source unit.
- positioned so that the light irradiation direction along this advancing direction may become parallel or substantially parallel can be illustrated.
- the pair of light source units are disposed so as to be located on one side and the other side opposite to the one side with the phosphor portion in between.
- the present invention it is possible to exemplify a mode in which the pair of light source units are disposed so as to face each other with the phosphor unit therebetween.
- the optical axes of the excitation light of the pair of light source units are located on the same virtual plane or substantially the same virtual plane, and the same virtual plane or substantially the same virtual plane is the light irradiation surface of the phosphor unit.
- the aspect which is orthogonal or substantially orthogonal to can be illustrated.
- the pair of light source units are configured to be line symmetric or substantially line symmetric.
- the plurality of pairs of light source units may be configured such that at least two pairs of the light source units are configured to be line symmetric or substantially line symmetric.
- the plurality of pairs of light source units can be exemplified by a mode in which at least two pairs of the light source units are arranged so as to face each other with the phosphor portion in between.
- the plurality of pairs of light source units are a pair of light source units of the plurality of pairs of light source units, and the other pair of light source units are opposed to the pair of light source units.
- the aspect which is comprised so that the 1st opposing direction to perform and the 2nd opposing direction where a pair of said other one pair of light source parts oppose may be orthogonal or substantially orthogonal.
- the plurality of pairs of light source units are a pair of light source units of the plurality of pairs of light source units, and the other pair of light source units are opposed to the pair of light source units.
- a mode in which the first facing direction and the second facing direction in which the other pair of light source units face each other is parallel or substantially parallel can be exemplified.
- the optical axis of the excitation light of the pair of light source units and the optical axis of the other pair of light source units are located on the same virtual plane or substantially the same virtual plane, and the same virtual A plane or substantially the same virtual plane can exemplify an aspect in which the plane is orthogonal or substantially orthogonal to the light irradiation surface in the phosphor portion.
- the pair of light source units includes a light irradiation direction along a traveling direction of the excitation light of one light source unit to the light irradiation surface, and a light irradiation surface of the excitation light of the other light source unit.
- intersect can be illustrated.
- the shapes of the vertical cross sections orthogonal to the optical axis direction of the excitation light emitted from the laser light source are all equal or substantially equal, and the at least two light source units are A mode in which the incident angles of the excitation light respectively irradiated on the light irradiation surfaces in the phosphor portion are equal to or substantially equal to each other can be exemplified.
- the at least two light source units are arranged so that an incident angle of the excitation light irradiated on the light irradiation surface increases as going from the inner side to the outer side with the phosphor portion in between.
- each of the at least two light source units includes a reflection mirror that reflects the excitation light emitted from the laser light source, and the phosphor unit is reflected from the reflection mirror in the at least two light source units.
- An example of receiving the excitation light and emitting the fluorescence is exemplified.
- the at least two light source units are configured such that the excitation lights emitted from the laser light source toward the reflection mirror are parallel or substantially parallel to each other.
- the at least two light source sections are configured such that any of the excitation light emitted from the laser light source toward the reflection mirror is orthogonal or substantially orthogonal to the light irradiation surface of the phosphor section.
- the aspect currently performed can be illustrated.
- the phosphor unit includes a light projecting lens that projects the fluorescence from a surface on the side that emits the fluorescence among the light irradiation surface and the surface opposite to the light irradiation surface.
- a light projecting lens that projects the fluorescence from a surface on the side that emits the fluorescence among the light irradiation surface and the surface opposite to the light irradiation surface.
- the incident angle of the excitation light to the light irradiation surface in the phosphor portion is larger than the capturing angle of the light projecting lens.
- the present invention it is possible to improve the luminance of fluorescence on the light irradiation surface when irradiating the light irradiation surface in the phosphor portion with a plurality of excitation lights superimposed.
- FIG. 1 is a cross-sectional view illustrating a schematic configuration of the light emitting device according to the first embodiment.
- FIG. 2 is a schematic configuration diagram illustrating the light source unit, the phosphor unit, and the light projecting lens extracted from the light emitting device illustrated in FIG. 1, and (a) and (b) are a side view and a plan view, respectively. is there.
- FIG. 3 is an explanatory diagram for explaining the state of the projection light on the light irradiation surface when the excitation light is irradiated at an incident angle with respect to the light irradiation surface in the phosphor portion.
- FIG. 3 is an explanatory diagram for explaining the state of the projection light on the light irradiation surface when the excitation light is irradiated at an incident angle with respect to the light irradiation surface in the phosphor portion.
- FIG. 4 is a schematic cross-sectional view showing excitation light with an incident angle and projection light on a light irradiation surface irradiated with excitation light, and (b) to (d) show the excitation light in the longitudinal direction of the shape of the projection light, respectively.
- FIG. 4 is a schematic plan view showing projected light on the light irradiation surface of the excitation light projected on the light irradiation surface in the light emitting device according to the first embodiment, wherein (a) to (c) are respectively The state of the projection light in the case where the longitudinal direction of the shape of the projection light is parallel or substantially parallel to the light irradiation direction, is orthogonal or substantially orthogonal, and is oblique.
- FIG. FIG. 5 is a schematic configuration diagram illustrating an example of a light-emitting device according to the second embodiment, and (a) and (b) each further include a pair of light source units in the light-emitting device according to the first embodiment. It is the side view and top view which show another example.
- FIG. 5 is a schematic configuration diagram illustrating an example of a light-emitting device according to the second embodiment, and (a) and (b) each further include a pair of light source units in the light-emitting device according to the first embodiment. It is the side
- FIG. 6 is a schematic plan view showing projected light on the light irradiation surface of excitation light projected on the light irradiation surface in the light emitting device according to the second embodiment shown in FIG. ) Is a diagram showing each example.
- FIG. 7 is a schematic plan view showing projected light on the light irradiation surface of excitation light projected on the light irradiation surface in the light emitting device according to the second embodiment shown in FIG. ) Is a diagram showing each example.
- FIG. 8 is a schematic cross-sectional view of the example shown in FIG. 6A when the main body chassis is fixed to the gantry.
- FIG. 9 is a schematic cross-sectional view when the main body chassis is fixed to the gantry in the example shown in FIG. FIG.
- FIG. 10 is a schematic configuration diagram illustrating another example of the light-emitting device according to the second embodiment.
- FIGS. 10A and 10B illustrate a pair of light source units in the light-emitting device according to the first embodiment, respectively. It is the side view and top view which show the other example further provided.
- FIG. 11 is a schematic plan view showing projected light on the light irradiation surface of the excitation light projected on the light irradiation surface in the light emitting device according to the second embodiment shown in FIG. ) Is a diagram showing each example.
- FIG. 12 is a schematic plan view showing projection light on the light irradiation surface of the excitation light projected on the light irradiation surface in the light emitting device according to the second embodiment shown in FIG.
- FIG. 13 is a schematic configuration diagram illustrating a light emitting device according to the third embodiment, and is a cross-sectional view illustrating an example in which excitation light from a light source unit is directly irradiated onto a light irradiation surface in a phosphor unit.
- FIG. 14 is a schematic configuration diagram illustrating a light emitting device according to the fourth embodiment, and is a cross-sectional view illustrating a transmission type configuration example.
- FIG. 15: is a schematic block diagram which shows the light-emitting device which concerns on 5th Embodiment, Comprising: It is a side view which shows the example in which the light irradiation direction of a pair of light source part cross
- FIG. 16 is a schematic block diagram which shows the light-emitting device which concerns on 6th Embodiment, Comprising: It is a side view which shows the example provided with the reflector.
- FIG. 17 shows a conventional configuration in which a plurality of excitation lights are irradiated on the light irradiation surface so that the excitation light overlaps the light irradiation surface in the phosphor portion. It is the schematic plan view which looked at the state which overlaps with a plane from the plane.
- FIG. 1 is a cross-sectional view illustrating a schematic configuration of a light emitting device 100 according to the first embodiment.
- FIG. 2 is a schematic configuration diagram showing the light source units 110 to 110, the phosphor unit 120, and the light projecting lens 170 extracted from the light emitting device 100 shown in FIG. 1, and FIGS. These are a side view and a plan view, respectively.
- the projection lens 170 is not shown, while the holding member 161 is shown. The same applies to FIGS. 5B and 10B described later.
- the light emitting device 100 includes a plurality (two in this example) of light source units 110 each having a laser light source 111 (see FIGS. 1 and 2A) that emits excitation light L. 110 and a phosphor portion 120 that receives a plurality of (two in this example) excitation lights L to L and emits fluorescence F [see FIGS. 1 and 2A].
- a laser light source 111 see FIGS. 1 and 2A
- a phosphor portion 120 that receives a plurality of (two in this example) excitation lights L to L and emits fluorescence F [see FIGS. 1 and 2A].
- the color of the fluorescence F (more precisely, the projection light M in which the excitation light L and the fluorescence F are mixed) can be arbitrarily selected according to the application.
- white light obtained by irradiating a fluorescent material emitting yellow light with a blue laser as excitation light L is suitable for an automotive headlamp.
- white light obtained by irradiating a phosphor emitting blue and red as excitation light L in red and green is preferable.
- a plurality (two in this example) of laser light sources 111 to 111 are laser light sources each including a semiconductor laser element 111a (LD: Laser Diode) [see FIGS. 1 and 2A].
- the phosphor part 120 includes a phosphor.
- the plurality (two in this example) of the semiconductor laser elements 111a to 111a and the phosphor portion 120 can be conventionally known ones, and detailed description thereof is omitted here.
- the light emitting device 100 emits the fluorescence F generated by irradiating the light irradiation surface 120a of the phosphor portion 120 with the excitation light L to L emitted from the laser light sources 111 to 111, respectively (FIGS. 1 and 2A). Reference] is used as illumination light.
- the projection light M to M projected from the light irradiation surface 120a of the excitation light L to L projected onto the irradiation surface 120a has a long shape (specifically, an elliptical shape).
- the ratio of the size in the longitudinal direction and the size in the short direction of the spot shape of the excitation light L to L is not limited to this, but can be about 10: 3, for example.
- the light emitting device 100 includes a main body chassis 130 (see FIG. 1), a plurality (two in this example) of light source units 140 to 140 (see FIG. 1), and a press plate 150 (see FIG. 1). Is further provided.
- the main body chassis 130 constitutes the main body of the light emitting device 100.
- the main body chassis 130 is provided with accommodating portions 131 (see FIG. 1) for accommodating the light source units 140 to 140, respectively.
- the light source units 140 to 140 include laser light sources 111 to 111 constituting the light source units 110 to 110, respectively, and a plurality (two in this example) of housing units 131 in the main body chassis 130 while holding the laser light sources 111 to 111. .. 131 are respectively fixed to the main body chassis 130 by fixing members SC to SC (see FIG. 1) such as screws.
- the main body chassis 130 is provided with excitation light passage holes 132 to 132 through which the excitation lights L to L emitted from the light source units 140 to 140 pass.
- the main body chassis 130 is provided with a projection light passage hole 133 through which the projection lights M to M emitted from the light irradiation surface 120a of the phosphor portion 120 pass.
- the excitation light passage holes 132 to 132 are along the optical axis direction or substantially the optical axis direction of the excitation lights L to L emitted from the light source units 140 to 140.
- the projection light passage hole 133 is along a direction orthogonal or substantially orthogonal to the light irradiation surface 120a.
- the main body chassis 130 is provided with excitation light passage holes 132 to 132 and projection light passage holes 133 communicating with each other.
- the light source sections 110 to 110 further include a reflection mirror 112 that reflects the excitation lights L to L emitted from the laser light sources 111 to 111, respectively.
- the light emitting device 100 further includes a plurality (two in this example) of mirror units 160 to 160 (see FIG. 1).
- the mirror units 160 to 160 have a plurality of (in this example) a plurality of (two in this example) reflecting mirrors 112 to 112 respectively holding the light source units 110 to 110 and a plurality of (in this example) reflecting mirrors 112 to 112 held in the main body chassis 130. 2) holding members 161 to 161 [see FIG. 1 and FIG. 2 (b)].
- the reflection mirrors 112 to 112 are provided on the inner wall of the projection light passage hole 133 in the main body chassis 130 via the holding members 161 to 161, respectively.
- the light source units 140 to 140 are further provided with collimating lenses 141 to 141 (see FIG. 1), respectively.
- a plurality (two in this example) of collimating lenses 141 to 141 are provided in the vicinity of the light exit ports 111b to 111b [see FIGS. 1 and 2B] of the laser light sources 111 to 111, respectively.
- the collimating lenses 141 to 141 adjust the size (spot size) or the like of a vertical section (spot) perpendicular to the axial direction of the excitation lights L to L when the excitation lights L to L are appropriately irradiated to the reflection mirrors 112 to 112 ( For example, an optical member for reducing the size.
- the collimating lenses 141 to 141 can be constituted by optical members such as convex lenses, for example.
- the light source units 140 to 140 move the collimating lenses 141 to 141 in the direction of the optical axis, so that, for example, screw structures 142 to 142 (not shown in FIG. 1; see FIGS. 13 and 14 to be described later) are moved to the optical axis. It is possible to adjust the spot sizes of the excitation lights L to L by moving in the optical axis direction while rotating around the axis along the axis.
- the light emitting device 100 includes a light emitting surface 120a and a surface 120b opposite to the light emitting surface 120a [see FIG. 1 and FIG.
- a projection lens 170 (see FIGS. 1 and 2A) for projecting the fluorescence F from the light irradiation surface 120a) is further provided.
- laser light sources 111 to 111 are provided on the side opposite to the light irradiation surface 120 a of the phosphor part 120, and reflection mirrors 112 to 112 are provided at positions between the phosphor part 120 and the light projecting lens 170. ing.
- the excitation lights L to L emitted from the laser light sources 111 to 111 are reflected by the reflection mirrors 112 to 112 and irradiated onto the light irradiation surface 120a of the phosphor portion 120, whereby the fluorescence F is emitted. appear. Then, the fluorescence F emitted from the surface on the side from which the fluorescence F is emitted (in this example, the light irradiation surface 120a) is projected to the outside through the projection lens 170.
- the excitation light L to L overlaps the light irradiation surface 120a. (Preferably so that at least one excitation light overlaps all the other excitation lights on the light irradiation surface 120a) and on the light irradiation surface 120a of the excitation light L to L projected on the light irradiation surface 120a.
- the projection light M to M (see FIG. 4 to be described later) is configured so that the longitudinal directions of the long shapes are parallel or substantially parallel to each other (specifically disposed, more specifically adjusted) Arranged).
- the plurality of light source units 110 to 110 are configured such that the longitudinal directions of the shapes of all the projection lights M to M are parallel or substantially parallel.
- the plurality of light source units 110 to 110 are configured such that the longitudinal direction of the shape of the projection light M to M is horizontal or substantially horizontal when the fluorescence F is projected to the outside.
- the plurality of light source units 110 to 110 are arranged so that the excitation lights L to L overlap with each other on the light irradiation surface 120a and the longitudinal directions of the long shapes of the projection lights M to M are parallel or substantially parallel to each other.
- the laser light sources 111 to 111 (in this example, the light source units 140 to 140) are arranged in a direction along a plane orthogonal to the optical axis direction of the excitation light L and in the optical axis direction of the excitation light L.
- the aspect adjusted by moving to the rotation direction of the surrounding axis line can be illustrated.
- Such adjustment can be performed, for example, while an operator observes the monitor of the enlarged display device while moving the light source units 140 to 140 using an adjustment jig.
- the excitation light L to L overlaps with the light irradiation surface 120a.
- the longitudinal directions of the long shapes of the projection lights M to M on the light irradiation surface 120a of the excitation light L to L projected on the light irradiation surface 120a are configured to be parallel or substantially parallel to each other.
- the luminance of the fluorescence F on the light irradiation surface 120a of the phosphor portion 120 can be improved.
- the plurality of light source units 110 to 110 are configured so that the longitudinal directions of the shapes of all the projection lights M to M are parallel or substantially parallel, thereby effectively improving the light intensity of the fluorescence F. be able to. Accordingly, when the plurality of excitation lights L to L are overlapped and irradiated onto the light irradiation surface 120a of the phosphor portion 120, the luminance of the fluorescence F on the light irradiation surface 120a of the phosphor portion 120 can be further improved. .
- the plurality of light source units 110 to 110 are configured such that the longitudinal direction of the shapes of the projection lights M to M is horizontal or substantially horizontal when the fluorescence F is projected to the outside. It can be suitably used for applications where a wide directional characteristic is desired in the horizontal direction, such as automotive headlamps.
- FIG. 3 is an explanatory diagram for explaining the state of the projection light M on the light irradiation surface 120a when the excitation light L is irradiated on the light irradiation surface 120a of the phosphor portion 120 with an incident angle ⁇ .
- FIG. 3A is a schematic cross-sectional view showing the excitation light L having an incident angle ⁇ and the projection light M on the light irradiation surface 120a irradiated with the excitation light L.
- FIG. 6 is a schematic plan view of a vertical cross section orthogonal to the optical axis direction of the excitation light L and the shape of the projection light M viewed from a plane when they are inclined and when they are inclined.
- the light source units 110 to 110 are a pair of light source units 110 and 110, and one of the pair of excitation light L and L and the pair of projection light M and M is one excitation light L and one projection light M. Is represented by the other excitation light L and the other projection light M, and the other excitation light L and the other projection light M are not shown.
- the longitudinal direction of the projection light M the longest straight line Kmax among the straight lines drawn from one end to the other end in the long shape of the projection light M [see FIG. 3 (b) to FIG. 3 (d)]. ] Direction.
- the short direction of the projection light M the direction of the shortest straight line among the straight lines drawn from one end to the other end in the long shape of the projection light M can be exemplified.
- the size is increased by (dL / cos ⁇ ) ⁇ dL with respect to the size dL (spot size) in the light irradiation direction W.
- the light irradiation direction W can also be said to be a direction along the incident direction and the reflection direction of the excitation light L to the light irradiation surface 120a.
- FIG. 4 is a schematic plan view showing projection light M to M projected on the light irradiation surface 120a of the excitation light L to L projected on the light irradiation surface 120a in the light emitting device 100 according to the first embodiment.
- 4A to 4C are orthogonal or substantially orthogonal when the longitudinal directions of the shapes of the projection lights M to M are parallel or substantially parallel to the light irradiation direction W, respectively.
- the state of the projection light M to M in the case of the case and the case of being inclined is shown.
- the longitudinal direction of the shapes of the projection light M (M1) and M (M2) of the pair of light source units 110 and 110 is the excitation light L (L1), A configuration (specifically disposed, more specifically adjusted) to be parallel or substantially parallel to the light irradiation direction W along the traveling direction of L (L2) to the light irradiation surface 120a. [See FIG. 4 (a)].
- the longitudinal direction of the shapes of the projection lights M (M1) and M (M2) of the light source units 110 and 110 is configured to be parallel or substantially parallel to the light irradiation direction W.
- the incident angles ⁇ ( ⁇ 1) and ⁇ ( ⁇ 2) of the excitation light L (L1) and L (L2) to the light irradiation surface 120a in the phosphor portion 120 increase, the projection light M (M1) and M (M2) Since the size of the shape in the longitudinal direction becomes large, it can be suitably used for applications in which a wide directivity characteristic in a predetermined linear direction is desired (for example, a vehicle headlamp in which a wide directivity characteristic is desirable in the horizontal direction).
- the longitudinal directions of the shapes of the projection light M (M1) and M (M2) of the pair of light source units 110 and 110 are the excitation light L (L1) and L (L2) configured to be orthogonal or substantially orthogonal to the light irradiation direction W along the traveling direction to the light irradiation surface 120a (specifically disposed, more specifically disposed in an adjusted state) [See FIG. 4 (b)].
- the longitudinal directions of the shapes of the projection lights M (M1) and M (M2) of the light source units 110 and 110 are configured so as to be orthogonal or substantially orthogonal to the light irradiation direction W.
- the incident angles ⁇ ( ⁇ 1) and ⁇ ( ⁇ 2) of the light L (L1) and M (L2) to the light irradiation surface 120a in the phosphor portion 120 increase, the projection light M (M1) and M (M2) Since the size of the shape in the short direction increases and the shapes of the projection lights M (M1) and M (M2) approach the perfect circle side, a wide directivity characteristic is desired in almost all directions (for example, wide in almost all directions). It can be suitably used for a projector having a desirable directivity.
- a pair of light source parts 110 and 110 are arrange
- wide directivity characteristics may be desired in the horizontal or vertical direction. Therefore, when the light source units 110 and 110 are arranged so that the light irradiation direction W is inclined with respect to the horizontal direction or the vertical direction, it is desired to cope with wide directivity characteristics in the horizontal direction or the vertical direction.
- the longitudinal direction (or short direction) of the shape of the projection light M (M1) and M (M2) of the pair of light source units 110 and 110 is excited.
- the longitudinal direction (or short direction) of the shape of the projection light M (M1) and M (M2) of the light source units 110 and 110 is configured to be oblique to the light irradiation direction W.
- a wide directivity characteristic in the horizontal direction or the vertical direction is desirable (for example, wide in the horizontal direction). Therefore, it is possible to cope with a wide directivity characteristic in the horizontal direction or the vertical direction.
- the angles ⁇ ( ⁇ 1), ⁇ ( ⁇ 2) [with respect to the light irradiation direction W in the longitudinal direction (or short direction) of the shapes of the projection lights M (M1) and M (M2) [ FIG. 4 (c)] is 45 degrees or approximately 45 degrees.
- the angles ⁇ ( ⁇ 1) and ⁇ ( ⁇ 2) with respect to the light irradiation direction W in the longitudinal direction (or short direction) of the shapes of the projection lights M (M1) and M (M2) are 45 degrees or approximately 45 degrees. Therefore, in this example, the pair of light source units 110 and 110 can be provided at an intermediate position between the horizontal direction and the vertical direction, and downsizing of the light emitting device 100 can be realized accordingly.
- the light source units 110 to 110 are a pair of light source units 110 and 110 each having the laser light source 111 as described above.
- the light source units 110 to 110 are a pair of light source units 110 and 110 each having a laser light source 111, so that the fluorescence of the light emitting surface 120a in the phosphor unit 120 can be minimized. Brightness can be improved.
- the pair of light source units 110 and 110 includes a light irradiation direction W along the traveling direction of the excitation light L (L1) of one light source unit 110 to the light irradiation surface 120a, and It arrange
- the pair of light source units 110 and 110 are arranged such that the light irradiation direction W of one light source unit 110 and the light irradiation direction W of the other light source unit 110 are parallel or substantially parallel.
- the light irradiation direction W of the one light source unit 110 and the other light source unit 110 can be aligned in one direction or substantially one direction.
- the pair of light source units 110 and 110 are disposed so as to be positioned on one side and the other side opposite to the one side with the phosphor unit 120 therebetween. .
- the pair of light source units 110 and 110 are disposed so as to be located on one side and the other side opposite to the one side with the phosphor unit 120 therebetween, so that the excitation light L , L are superimposed on the light irradiation surface 120a of the phosphor portion 120, and the configuration of the pair of light source portions 110, 110 for making the longitudinal direction of the long shape of the projection light M parallel or substantially parallel to each other is simple and It can be easily realized.
- the pair of light source units 110 and 110 are arranged to face each other with the phosphor unit 120 therebetween.
- the facing direction X is a direction in which the pair of light source units 110 and 110 face each other with the phosphor portion 120 therebetween, and the facing direction X is one of the light sources 110 and 110 in the pair.
- the direction of an imaginary straight line ⁇ (see FIG. 2B) connecting the center of the light emission port 111b of the laser light source 111 in the unit 110 and the center of the light emission port 111b of the laser light source 111 in the other light source unit 110 can be exemplified.
- the facing direction X is the light irradiation direction W or substantially the light irradiation direction W.
- the pair of light source units 110 and 110 are disposed so as to oppose each other with the phosphor unit 120 therebetween, so that the shapes of the projection lights M (M1) and M (M2) are opposed to each other.
- the size in the direction orthogonal to the direction X can be easily adjusted, and the arrangement positions of the pair of light source units 110 and 110 can be aligned on the same virtual plane or substantially the same virtual plane.
- the optical axes of the excitation lights L (L1) and L (L2) of the pair of light source units 110 and 110 that is, the light of the excitation light L (L1) of the light source unit 110 on one side).
- the optical axis of the excitation light L (L2) of the light source unit 110 on the other side are located on the same virtual plane or substantially the same virtual plane. It is orthogonal or substantially orthogonal to the light irradiation surface 120a.
- the optical axes of the excitation light L (L1) and L (L2) of the pair of light source units 110 and 110 are located on the same virtual plane or substantially the same virtual plane, and the same virtual plane or substantially the same virtual plane. Is orthogonal or substantially orthogonal to the light irradiation surface 120a of the phosphor portion 120, thereby minimizing the size of the projection light M (M1) and M (M2) in the direction orthogonal to the light irradiation direction W. Therefore, the illuminance on the light irradiation surface 120a by the irradiation of the excitation light L (L1) and L (L2) can be increased accordingly.
- the pair of light source units 110 and 110 are line-symmetric or substantially line-symmetric [in this example, the projection light M (M1) and M (M2) of the light irradiation surface 120a in the phosphor unit 120 ) With respect to a virtual normal passing through the center of ().
- the pair of light source units 110 and 110 are configured to be line symmetric or substantially line symmetric, so that common parts can be realized and the pair of light source units 110 and 110 can be simplified.
- the light emitting device 100 can be further reduced in size.
- the pair of light source units 110 and 110 is line-symmetrical or substantially line-symmetric with respect to a virtual normal passing through the center of the projection light M (M1) and M (M2) of the light irradiation surface 120a of the phosphor unit 120. This is particularly effective when configured to be.
- the center of the projection light M can be exemplified by the center of the longest straight line drawn from one end to the other end in the long shape of the projection light M.
- the average position may be taken, or a straight line drawn from one end to the other end in a portion where the projection lights M to M overlap.
- the center of the longest straight line may be used.
- the projection light M (M2) on the light irradiation surface 120a of the excitation light L (L2) projected from the other light source unit 110 onto the light irradiation surface 120a are difficult to match or substantially match.
- the shapes of the vertical cross sections perpendicular to the optical axis direction of the excitation lights L to L emitted from the laser light sources 111 to 111 in the light source units 110 to 110 are all equal or
- the light source units 110 to 110 have substantially the same shape, and are configured so that the incident angles ⁇ to ⁇ of the excitation lights L to L irradiated onto the light irradiation surface 120a of the phosphor unit 120 are equal or substantially equal to each other (specifically, For example, more specifically, in an adjusted state).
- the shapes of the vertical cross sections perpendicular to the optical axis direction of the excitation lights L to L emitted from the laser light sources 111 to 111 in the light source units 110 to 110 are all equal or substantially equal.
- ⁇ 110 are configured such that the incident angles ⁇ ⁇ of the excitation lights L ⁇ L irradiated on the light irradiation surface 120a of the phosphor portion 120 are equal or substantially equal to each other, so that the light sources 110 ⁇ 110
- the projection light M to M projected on the light irradiation surface 120a of the excitation light L to L projected onto the light irradiation surface 120a can be made to coincide with each other or substantially coincide with each other. It is possible to eliminate or substantially eliminate the portion that protrudes from the portion where the projection light M to M overlaps at 120a, so that the light intensity of the fluorescence F can be further improved without waste. it can.
- the light source units 110 to 110 include reflection mirrors 112 to 112 that reflect the excitation lights L to L emitted from the laser light sources 111 to 111, respectively.
- the phosphor part 120 emits fluorescence F in response to the excitation lights L to L reflected from the reflection mirrors 112 to 112 in the light source parts 110 to 110.
- the light source units 110 to 110 include the reflection mirrors 112 to 112, respectively, and the phosphor unit 120 receives the excitation lights L to L reflected from the reflection mirrors 112 to 112 in the light source units 110 to 110.
- the laser light sources 111 to 111 can be disposed on the side opposite to the light irradiation surface 120a of the phosphor portion 120. Accordingly, it is possible to improve the degree of design freedom regarding the arrangement positions of the laser light sources 111 to 111.
- the light source units 110 to 110 are configured such that the excitation lights L to L emitted from the laser light sources 111 to 111 toward the reflection mirrors 112 to 112 are parallel or substantially parallel to each other. (Specifically disposed, more specifically disposed in an adjusted state).
- the light source units 110 to 110 are configured such that the excitation lights L to L emitted from the laser light sources 111 to 111 toward the reflection mirrors 112 to 112 are parallel or substantially parallel to each other.
- the excitation light L to L can be emitted from the laser light sources 111 to 111 in the same direction or in substantially the same direction, whereby the light emitting device 100 can be further reduced in size.
- the light source units 110 to 110 are such that the excitation light L to L emitted from the laser light sources 111 to 111 toward the reflection mirrors 112 to 112 is the light irradiation surface of the phosphor unit 120. It is configured to be orthogonal or substantially orthogonal to 120a (specifically disposed, more specifically disposed in an adjusted state).
- the excitation light L to L emitted from the laser light sources 111 to 111 toward the reflection mirrors 112 to 112 are all orthogonal to the light irradiation surface 120a in the phosphor unit 120.
- the excitation light L to L can be emitted from the laser light sources 111 to 111 in a direction orthogonal or substantially orthogonal to the light irradiation surface 120a. Further downsizing can be realized.
- the reflection type light emission principle is used in which the excitation light L to L is irradiated on the light irradiation surface 120a of the phosphor part 120 and the fluorescence F is emitted from the light irradiation surface 120a.
- the reflection type light emitting device 100 can be suitably used.
- the projecting lens 170 projects light within a predetermined angle range by refracting the transmitted fluorescence F.
- the light projecting lens 170 is disposed on the light emitting surface 120 a of the phosphor portion 120 on the side from which the fluorescence F is emitted.
- the light projecting lens 170 is provided so as to face the surface on the side from which the fluorescence F is emitted (in this example, the light irradiation surface 120a).
- the light projecting lens 170 by providing the light projecting lens 170, it is possible to project the fluorescence F from the phosphor portion 120 in a predetermined direction in a predetermined angle range.
- the fluorescent light F from the phosphor part 120 can be projected in a desired angle range in a desired direction.
- the incident angles ⁇ to ⁇ of the excitation light L to L on the light irradiation surface 120a in the phosphor portion 120 are larger than the taking angles ⁇ to ⁇ of the light projecting lens 170, so The fluorescence F can be taken into the projection lens 170 without waste, and the fluorescence F from the phosphor portion 120 can be efficiently projected from the projection lens 170 accordingly.
- the capture angles ⁇ to ⁇ pass through virtual normals passing through the centers of the projection lights M to M on the light irradiation surface 120a in the phosphor portion 120, both ends of the light projecting lens 170, and the centers of the projection lights M to M. This is the angle formed with the virtual straight line.
- An example of the center of the projection light M is the center of the longest straight line drawn from one end to the other end in the long shape of the projection light M.
- the light emitting device 100 includes a plurality of pairs (two pairs in this example) of a pair of light source units 110 and 110 (see FIGS. 5 and 6 to be described later).
- the luminance of the fluorescence F on the light irradiation surface 120a in the phosphor unit 120 can be further increased.
- At least two pairs of light source units of the plurality of pairs of light source units (110, 110) to (110, 110) are [in this example, any pair of light source units (110, 110)].
- 110) to (110, 110)] and the configuration (specifically disposed, more specific) so that the excitation light (L, L) to (L, L) overlaps the light irradiation surface 120a in the phosphor portion 120.
- the configuration specifically disposed, more specific
- the plurality of pairs of light source units (110, 110) to (110, 110) are arranged such that the excitation lights (L, L) to (L, L) overlap on the light irradiation surface 120a of the phosphor unit 120.
- the plurality of pairs of light source units (110, 110) to (110, 110) include at least two pairs of light source units [in this example, any pair of light source units (110 , 110) to (110, 110)] line symmetric or substantially line symmetric (in this example, line symmetric or substantially symmetric with respect to a virtual normal passing through the center of the projection light M to M of the light irradiation surface 120a of the phosphor portion 120). It is configured (specifically disposed) so as to be line symmetric.
- the plurality of pairs of light source units (110, 110) to (110, 110) are configured such that at least two pairs of light source units are line-symmetrical or substantially line-symmetrical. Even if a plurality of pairs of the light source units 110, 110 are provided, it is possible to realize the common use of parts and to make the plurality of pairs of light source units (110, 110) to (110, 110) have a simple arrangement configuration. Thus, further downsizing of the light emitting device 100 can be realized.
- the plurality of pairs of light source units (110, 110) to (110, 110) are line-symmetrical or substantially symmetric with respect to a virtual normal passing through the center of the projection light M to M of the light irradiation surface 120a in the phosphor unit 120. This is particularly effective when configured to be line symmetric.
- center of the projection light M is the same as that described in the first embodiment-10, and the description thereof is omitted here.
- the plurality of pairs of light source units (110, 110) to (110, 110) include at least two pairs of light source units [in this example, any pair of light source units (110 , 110) to (110, 110)] are arranged so as to face each other with the phosphor portion 120 therebetween.
- the plurality of pairs of light source units (110, 110) to (110, 110) are arranged such that at least two pairs of light source units face each other with the phosphor unit 120 therebetween.
- each pair of light source units 110 and 110 it is possible to easily adjust the size of the projection light M and M in the direction orthogonal to the facing direction X, and the arrangement of each pair of light source units 110 and 110.
- the positions can be aligned on the same virtual plane or substantially the same virtual plane.
- FIG. 5 is a schematic configuration diagram illustrating an example of the light emitting device 100 according to the second embodiment.
- FIGS. 5A and 5B are a pair of diagrams of the light emitting device 100 according to the first embodiment. It is the side view and top view which show an example further provided with the light source part 110,110.
- a plurality of pairs (two pairs in this example) of the light source units (110, 110) to (110, 110) are a plurality of pairs of the light source units (110, 110) to ( 110, 110) and a pair of light source units (110, 110) and a pair of light source units (110, 110) are opposed to a pair of light source units (110, 110).
- the first facing direction X (X1) to be performed and the second facing direction X (X2) facing the other pair of light source units (110, 110) are configured to be orthogonal or substantially orthogonal (specifically Are arranged).
- the pair of light source units (110, 110) is the same as the configuration of the light emitting device 100 according to the first embodiment, and a description thereof is omitted here.
- the other pair of light source units (110, 110) emit excitation light L (L3), L (L4) when the light irradiation surface 120a of the phosphor unit 120 is irradiated with the excitation light L (L3), L (L4), respectively.
- L (L4) is projected onto the light irradiation surface 120a so that L (L4) overlaps with the light irradiation surface 120a (preferably at least one excitation light overlaps all other excitation light on the light irradiation surface 120a).
- Other configurations are the same as the configuration of the light emitting device 100 according to the first embodiment, and a description thereof is omitted here.
- the first facing direction X (X1) is the first light irradiation direction W (W1) along the traveling direction of the excitation light L (L1) and L (L2) to the light irradiation surface 120a or substantially the first direction.
- the second irradiation direction X (X2) is the second irradiation direction along the traveling direction of the excitation lights L (L3) and L (L4) to the irradiation surface 120a. W (W2) or substantially the second light irradiation direction W (W2).
- the light source unit (110, 110) includes a first opposing direction X (X1) in which a pair of light source units (110, 110) face each other and another pair of light source units (110, 110). Even if a plurality of pairs of light source units 110 and 110 are provided, the plurality of pairs of light source units (110) are configured so that the second opposing direction X (X2) facing each other is orthogonal or substantially orthogonal.
- , 110) to (110, 110) are arranged radially (for example, adjacent light sources) around the light irradiation surface 120a of the phosphor portion 120, specifically, a predetermined point (for example, a center point) on the light irradiation surface 120a.
- the distance between the optical axes of the sections 110 and 110 is equal. To become so) it can be provided, which makes it possible to realize a compact light emitting device 100.
- L (L4)] is a schematic plan view showing projection light [M (M1), M (M2)], [M (M3), M (M4)] on the light irradiation surface 120a.
- FIG. 6A to FIG. 6E and FIG. 7A to FIG. 7D show examples thereof.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is parallel or substantially parallel to the first light irradiation direction W (W1) [first facing direction X (X1)], and another pair of light source units (110, 110, 110) is the second light irradiation direction W (W2) [second facing direction] in the longitudinal direction of the shapes of the projection light M (M3) and M (M4) by the excitation light [L (L3), L (L4)].
- the direction X (X2)] is orthogonal or substantially orthogonal.
- FIG. 8 is a schematic cross-sectional view when the main body chassis 130 is fixed to the mount 190 in the example shown in FIG.
- the illustration of the configuration other than the excitation light L1 to L4 is omitted.
- the fluorescent F has a horizontal or substantially horizontal longitudinal direction, and thus can be suitably used for applications in which a wide directivity characteristic is desired in the horizontal direction H, such as an automotive headlamp.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is orthogonal or substantially orthogonal to the first light irradiation direction W (W1) [first opposing direction X (X1)], and another pair of light source portions (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) is the second light irradiation direction W (W2) [second opposing direction] X (X2)] is parallel or substantially parallel.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is inclined with respect to the first light irradiation direction W (W1) [first opposing direction X (X1)], and from the other pair of light source units (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) by the excitation light [L (L3), L (L4)] is the second light irradiation direction W (W2) [second opposing direction X ( X2)].
- FIG. 9 is a schematic cross-sectional view when the main body chassis 130 is fixed to the mount 190 in the example shown in FIG.
- the illustration of the configuration other than the excitation light L1 to L4 is omitted.
- the fluorescent F has a horizontal or substantially horizontal longitudinal direction, and thus can be suitably used for applications in which a wide directivity characteristic is desired in the horizontal direction H, such as an automotive headlamp. Further, compared to the example shown in FIGS.
- excitation light L2, L4, excitation light L1, L3 in the example shown in FIG. 9 are horizontal or substantially horizontal. Therefore, it is possible to omit the arc portion (the lower portion in the example shown in FIG. 9) of the cylindrical main body chassis 130 on the mount 190 side. That is, the height h1 (see FIG. 8) of the main body chassis 130 can be made lower (see the height h2 of the main body chassis 130 shown in FIG. 9), and it can be used for automobiles from the viewpoint of making the device compact and reducing the air resistance during travel. It can be suitably used with a headlamp or the like.
- the projection light M (M1), M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is parallel or substantially parallel to the first light irradiation direction W (W1) [first facing direction X (X1)], and another pair of light source units (110, 110, 110) is the second light irradiation direction W (W2) [second facing direction] in the longitudinal direction of the shapes of the projection light M (M3) and M (M4) by the excitation light [L (L3), L (L4)].
- W1 first facing direction X (X1)
- W2 second facing direction
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is orthogonal or substantially orthogonal to the first light irradiation direction W (W1) [first opposing direction X (X1)], and another pair of light source portions (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) is the second light irradiation direction W (W2) [second opposing direction] X (X2)] is orthogonal or substantially orthogonal.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is inclined with respect to the first light irradiation direction W (W1) [first opposing direction X (X1)], and from the other pair of light source units (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) by the excitation light [L (L3), L (L4)] is the second light irradiation direction W (W2) [second opposing direction X ( X2)] is orthogonal or substantially orthogonal.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is inclined with respect to the first light irradiation direction W (W1) [first opposing direction X (X1)], and from the other pair of light source units (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) by the excitation light [L (L3), L (L4)] is the second light irradiation direction W (W2) [second opposing direction X ( X2)] is parallel or substantially parallel.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is parallel or substantially parallel to the first light irradiation direction W (W1) [first facing direction X (X1)], and another pair of light source units (110, 110, 110) is the second light irradiation direction W (W2) [second facing direction] in the longitudinal direction of the shapes of the projection light M (M3) and M (M4) by the excitation light [L (L3), L (L4)]. It is oblique to the direction X (X2)].
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is orthogonal or substantially orthogonal to the first light irradiation direction W (W1) [first opposing direction X (X1)], and another pair of light source portions (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) is the second light irradiation direction W (W2) [second opposing direction] X (X2)].
- the longitudinal size of the shapes of the projection lights M (M1), M (M2), M (M3), and M (M4) increases. It can be suitably used for applications in which a wide directivity characteristic in a predetermined linear direction is desired (for example, a vehicle headlamp in which a wide directivity characteristic is desirable in the horizontal direction).
- the light emitting device 100 includes two pairs of the light source units 110 and 110 is shown.
- the two pairs of light source units (110 and 110) and (110 and 110) are provided.
- FIG. 10 is a schematic configuration diagram illustrating another example of the light emitting device 100 according to the second embodiment, and FIGS. 10A and 10B respectively illustrate the light emitting device 100 according to the first embodiment.
- FIG. 6 is a side view and a plan view showing another example further including a pair of light source units 110, 110.
- a plurality of pairs (two pairs in this example) of the light source units (110, 110) to (110, 110) include a plurality of pairs of light source units (110, 110).
- a pair of light source units (110, 110) of (110, 110) and another pair of light source units (110, 110) are a pair of light source units (110, 110).
- the first facing direction X (X1) facing each other and the second facing direction X (X2) facing the other pair of light source units (110, 110) are parallel or substantially parallel. (Specifically disposed).
- the pair of light source units (110, 110) is the same as the configuration of the light emitting device 100 according to the first embodiment, and a description thereof is omitted here.
- the other pair of light source units (110, 110) is the same as the configuration of the light emitting device 100 according to the second embodiment-4 shown in FIG. 5, and the description thereof is omitted here.
- the first facing direction X (X1) is the first light irradiation direction W (W1) along the traveling direction of the excitation light L (L1) and L (L2) to the light irradiation surface 120a or substantially the first direction.
- the second irradiation direction X (X2) is the second irradiation direction along the traveling direction of the excitation lights L (L3) and L (L4) to the irradiation surface 120a. W (W2) or substantially the second light irradiation direction W (W2).
- the light source unit (110, 110) includes a first opposing direction X (X1) in which a pair of light source units (110, 110) face each other and another pair of light source units (110, 110). Even if a plurality of pairs of light source units 110 and 110 are provided, a plurality of pairs of light source units (a plurality of pairs of light source units ((X2)) are arranged in parallel or substantially parallel to each other. 110, 110) to (110, 110) can be provided along one direction [first and second opposing directions X (X1), X (X2)], and thereby in a direction orthogonal to one direction. Can be made compact.
- the optical axis of the excitation light L [L (L3), L (L4)] is located on the same virtual plane or substantially the same virtual plane, and the same virtual plane or substantially the same virtual plane is irradiated with light in the phosphor portion 120. It is orthogonal or substantially orthogonal to the surface 120a.
- a plurality of pairs of light source units (110, 110) to (110, 110) are provided on a straight line along one direction [first and second opposing directions X (X1), X (X2)].
- the light source units 110 to 110 emit light as they go from the inside to the outside with a predetermined point (for example, the center point) of the phosphor unit 120, specifically, the light irradiation surface 120a in between.
- the incident angles ⁇ to ⁇ ( ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4) of the excitation light irradiated onto the irradiation surface 120a [see FIG. 10A] are arranged to be large. By doing so, the light source units 110 to 110 can be efficiently arranged.
- the incident angles ⁇ can be the same or substantially the same.
- 11 and 12 show another example of the light emitting device 100 according to the second embodiment shown in FIG. 10, and the excitation light [L (L1), L (L2)], [L (L3), L (L4)] is a schematic plan view showing projected light [M (M1), M (M2)], [M (M3), M (M4)] on the light irradiation surface 120a.
- FIG. 11A to FIG. 11E and FIG. 12A to FIG. 12D show examples thereof.
- the length of the projection light [M (M3), M (M4)] in the longitudinal direction is larger than the length of the projection light [M (M1), M (M2)] in the longitudinal direction.
- the incident angles ⁇ 3 and ⁇ 4 are larger than the incident angles ⁇ 1 and ⁇ 2, and dL / cos ⁇ of the projection light [M (M3), M (M4)] is dL / of the projection light [M (M1), M (M2)]. This is because it becomes larger than cos ⁇ .
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is parallel or substantially parallel to the first light irradiation direction W (W1) [first facing direction X (X1)], and another pair of light source units (110, 110, 110) is the second light irradiation direction W (W2) [second facing direction] in the longitudinal direction of the shapes of the projection light M (M3) and M (M4) by the excitation light [L (L3), L (L4)].
- W (W1) first facing direction X (X1)
- W2 second facing direction
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is orthogonal or substantially orthogonal to the first light irradiation direction W (W1) [first opposing direction X (X1)], and another pair of light source portions (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) is the second light irradiation direction W (W2) [second opposing direction] X (X2)] is orthogonal or substantially orthogonal.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is inclined with respect to the first light irradiation direction W (W1) [first opposing direction X (X1)], and from the other pair of light source units (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) by the excitation light [L (L3), L (L4)] is the second light irradiation direction W (W2) [second opposing direction X ( X2)].
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is parallel or substantially parallel to the first light irradiation direction W (W1) [first facing direction X (X1)], and another pair of light source units (110, 110, 110) is the second light irradiation direction W (W2) [second facing direction] in the longitudinal direction of the shapes of the projection light M (M3) and M (M4) by the excitation light [L (L3), L (L4)].
- the direction X (X2)] is orthogonal or substantially orthogonal.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is orthogonal or substantially orthogonal to the first light irradiation direction W (W1) [first opposing direction X (X1)], and another pair of light source portions (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) is the second light irradiation direction W (W2) [second opposing direction] X (X2)] is parallel or substantially parallel.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is inclined with respect to the first light irradiation direction W (W1) [first opposing direction X (X1)], and from the other pair of light source units (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) by the excitation light [L (L3), L (L4)] is the second light irradiation direction W (W2) [second opposing direction X ( X2)] is parallel or substantially parallel.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is inclined with respect to the first light irradiation direction W (W1) [first opposing direction X (X1)], and from the other pair of light source units (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) by the excitation light [L (L3), L (L4)] is the second light irradiation direction W (W2) [second opposing direction X ( X2)] is orthogonal or substantially orthogonal.
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is parallel or substantially parallel to the first light irradiation direction W (W1) [first facing direction X (X1)], and another pair of light source units (110, 110, 110) is the second light irradiation direction W (W2) [second facing direction] in the longitudinal direction of the shapes of the projection light M (M3) and M (M4) by the excitation light [L (L3), L (L4)]. It is oblique to the direction X (X2)].
- the projection light M (M1) and M (M2) of the excitation light [L (L1), L (L2)] from the pair of light source units (110, 110) is set.
- the longitudinal direction of the shape is orthogonal or substantially orthogonal to the first light irradiation direction W (W1) [first opposing direction X (X1)], and another pair of light source portions (110, 110).
- the longitudinal direction of the shape of the projection light M (M3), M (M4) is the second light irradiation direction W (W2) [second opposing direction] X (X2)].
- the longitudinal size of the shapes of the projection lights M (M1), M (M2), M (M3), and M (M4) is increased. It can be suitably used for applications in which a wide directivity characteristic in a predetermined linear direction is desired (for example, a vehicle headlamp in which a wide directivity characteristic is desirable in the horizontal direction).
- the plurality of pairs of light source units are added to a pair of light source units (110, 110) and another pair of light source units (110, 110). Although not shown in the figure, it further includes another pair of light source sections (110, 110) and another pair of light source sections (110, 110), and yet another pair of light sources.
- the part (110, 110) and another pair of light source parts (110, 110) are further separated from a third facing direction in which another pair of light source parts (110, 110) faces each other.
- the pair of light source portions (110, 110) of the pair is parallel or substantially parallel to the fourth facing direction, and the third and fourth facing directions are the first and second facing directions. It may be configured to be orthogonal or substantially orthogonal to the directions X (X1) and X (X2).
- the example in which the light emitting device 100 includes two pairs of the light source units 110 and 110 is shown, but three or more pairs may be provided.
- the incident angle of the excitation light irradiated on the light irradiation surface 120a increases.
- a similar configuration may be used in another configuration in which a plurality of light source units 110 are provided.
- the effect of overlapping the spots is reduced compared to the case where the incident angles are equal, but a constant overlap of the spots can be expected by aligning the longitudinal direction of the spots, and the installation location of the light source unit 110 is limited. Is particularly effective.
- FIG. 13 is a schematic configuration diagram showing the light emitting device 100 according to the third embodiment, which directly irradiates the light irradiation surface 120a of the phosphor portion 120 with the excitation lights L to L from the light source portions 110 to 110. It is sectional drawing which shows an example.
- the light emitting device 100 according to the third embodiment shown in FIG. 13 removes the mirror units 160 to 160 in the light emitting device 100 according to the first embodiment, and converts the excitation light L to L from the light source portions 110 to 110 to the phosphor portion.
- the configuration is the same as that of the light emitting device 100 according to the first embodiment except that the light irradiation surface 120a in 120 is directly irradiated.
- excitation light L to L from the light source units 110 to 110 is directly irradiated onto the light irradiation surface 120a of the phosphor unit 120.
- laser light sources 111 to 111 are provided between the phosphor portion 120 and the light projecting lens 170.
- the excitation light L to L emitted from the laser light sources 111 to 111 is irradiated to the light irradiation surface 120a of the phosphor part 120, and thereby the fluorescence F is generated. Then, the fluorescence F emitted from the surface on the side from which the fluorescence F is emitted (in this example, the light irradiation surface 120a) is projected to the outside through the projection lens 170.
- the light emitting device 100 has a simple configuration by directly irradiating the light irradiation surface 120a of the phosphor portion 120 with the excitation light L to L from the light source portions 110 to 110. Accordingly, the light emitting device 100 can be downsized accordingly.
- the mirror units 160 to 160 are removed from the light emitting device 100 according to the first embodiment, and the excitation light L to L from the light source units 110 to 110 is irradiated with light on the phosphor unit 120.
- the surface 120a is directly irradiated, the mirror units 160 to 160 are removed from the light source units 110 to 110 in the light emitting device 100 according to the second embodiment and the fifth and sixth embodiments described later.
- the excitation light L to L may be directly irradiated onto the light irradiation surface 120a of the phosphor portion 120.
- FIG. 14 is a schematic configuration diagram illustrating the light emitting device 100 according to the fourth embodiment, and is a cross-sectional view illustrating a transmission type configuration example.
- the light emitting device 100 according to the fourth embodiment has a transmissive configuration instead of the reflective configuration of the light emitting device 100 according to the third embodiment.
- a transmission type that emits fluorescence F from the surface 120b opposite to the light irradiation surface 120a by irradiating the light irradiation surface 120a of the phosphor portion 120 with the excitation light L to L.
- the light emission principle is used.
- a transmissive configuration is used instead of the reflective configuration of the light emitting device 100 according to the third embodiment, but the first embodiment, the second embodiment, and a later-described configuration.
- a transmissive configuration may be used instead of the reflective configuration of the light emitting device 100 according to the fifth and sixth embodiments.
- FIG. 15 is a schematic configuration diagram illustrating the light emitting device 100 according to the fifth embodiment, and is a side view illustrating an example in which the light irradiation directions W and W of the pair of light source units 110 and 110 intersect.
- the light-emitting device 100 shown in FIG. 15 has a configuration of the second embodiment-4 (an example of the light-emitting device 100 according to the second embodiment) shown in FIG. Either one of the light source units 110 and the other pair of light source units (110, 110) is removed.
- the pair of light source units 110 and 110 includes a light irradiation direction W (W1) along the traveling direction of the excitation light L (L3) of one light source unit 110 to the light irradiation surface 120a.
- the light irradiation direction W (W2) along the traveling direction of the excitation light L (L2) of the other light source unit 110 to the light irradiation surface 120a intersects (in this example, orthogonal or substantially orthogonal). ing.
- the pair of light source units 110 and 110 includes the light irradiation direction W along the traveling direction of the excitation light L of one light source unit 110 to the light irradiation surface 120 a and the excitation light L of the other light source unit 110. Is arranged so that the light irradiation direction W along the traveling direction to the light irradiation surface 120a intersects the light irradiation surface 120a. Since the portions 110 and 110 are not provided, the space on the opposite side can be used effectively.
- the light source units 110 to 110 may be three or more.
- the three or more light source units 110 to 110 are arranged radially (for example, adjacent to the light irradiation surface 120a of the phosphor unit 120, specifically, a predetermined predetermined point (for example, the center point) of the light irradiation surface 120a. So that the distances between the optical axes of the matching light source portions 110 and 110 are equal).
- FIG. 16 is a schematic configuration diagram illustrating the light emitting device 100 according to the sixth embodiment, and is a side view illustrating an example including a reflector 180.
- a light emitting device 100 shown in FIG. 16 is provided with a reflector 180 in place of or in addition to the light projecting lens 170 (in this example, in the configuration of the first embodiment shown in FIG. 2).
- the light emitting device 100 shown in FIG. 16 includes a reflector 180 that projects the fluorescence F from the light irradiation surface 120a in the phosphor portion 120.
- the fluorescence F from the phosphor portion 120 is determined in advance while having a simple configuration.
- the light can be projected in a predetermined direction, whereby the fluorescent light F from the phosphor portion 120 can be projected in a desired direction.
- the light-emitting device 100 shown in FIG. 16 can be suitably used, for example, for an automobile headlamp (vehicle headlamp).
- the reflector 180 projects the fluorescence F emitted from the light irradiation surface 120a in the phosphor portion 120.
- the reflector 180 may be a member in which a metal thin film is formed on the inner surface of a resin member, or may be a metal member.
- the reflector 180 reflects at least a part of a partial curved surface obtained by cutting a reflection curved surface formed by rotating the parabola with a plane parallel to the rotation axis with the parabolic symmetry axis as a rotation axis. It is included in the curved surface.
- the reflector 180 has a semicircular opening 180a in the direction in which the fluorescent light F emitted from the light irradiation surface 120a in the phosphor 120 is projected.
- the light irradiation surface 120 a in the phosphor portion 120 is disposed at a substantially focal position of the reflector 180.
- the fluorescence F generated on the light irradiation surface 120a in the phosphor portion 120 travels from the opening portion 180a of the reflector 180 in a state where a light bundle close to parallel is formed by the reflector 180. Light is projected in the direction. Thereby, the fluorescence F generated on the light irradiation surface 120a can be efficiently projected within a narrow solid angle.
- the reflector 180 may include a full parabolic mirror having a circular opening 180a or a part thereof. Besides the parabolic mirror, an elliptical surface, a free-form surface shape, or a multi-faceted one (multi-reflector) can be used. Furthermore, a part that is not a curved surface may be included in a part of the reflector 180. Alternatively, the reflector 180 may be one that magnifies and projects the fluorescence F from the light irradiation surface 120a in the phosphor portion 120.
- the light emitting device 100 may further include an optical member such as a light projecting lens that controls an angle range of light projected to the opening 180a of the reflector 180.
- an optical member such as a light projecting lens that controls an angle range of light projected to the opening 180a of the reflector 180.
- the reflector 180 is provided in the light emitting device 100 according to the first embodiment.
- a reflector 180 may be provided instead of the light projecting lens 170 in the light emitting device 100 according to the second to fifth embodiments.
- a reflector 180 may be provided instead of the light projecting lens 170 in the light emitting device 100 according to the second to fifth embodiments.
- the light emitting device 100 may be applied to a vehicle headlamp other than an automobile.
- the light-emitting device 100 is not limited thereto, but includes, for example, a headlamp, a searchlight, a projector,
- the present invention can be applied to lighting devices such as indoor lighting fixtures such as downlights and stand lamps.
- the present invention relates to a light-emitting device that emits fluorescence by irradiating excitation light onto a light irradiation surface in a phosphor portion, and in particular, irradiates a light irradiation surface in a phosphor portion with a plurality of excitation lights superimposed.
- the present invention can be applied to an application for improving the luminance of fluorescence on the light irradiation surface.
- Light-emitting device 110 Light source part 111 Laser light source 111a Semiconductor laser element 111b Light exit 112 Reflection mirror 120 Phosphor part 120a Light irradiation surface 120b Surface opposite to the light irradiation surface 130 Main body chassis 131 Housing part 132 Excitation light passage hole 133 Projection light passage hole 140 Light source unit 141 Collimator lens 142 Screw structure 150 Press plate 160 Mirror unit 161 Holding member 170 Projection lens 180 Reflector 180a Opening portion F Fluorescence Kmax Longest straight line L Excitation light M Projection light SC Fixed member W Light Irradiation direction X Opposite direction ⁇ Virtual straight line ⁇ Capture angle ⁇ Incident angle ⁇ Angle
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Abstract
Description
図1は、第1実施形態に係る発光装置100の概略構成を示す断面図である。図2は、図1に示す発光装置100の光源部110~110、蛍光体部120及び投光レンズ170を抜き出して示す概略構成図であって、図2(a)及び図2(b)は、それぞれ、その側面図及び平面図である。なお、図2(b)では、投光レンズ170は図示を省略する一方、保持部材161を図示している。このことは、後述する図5(b)及び図10(b)についても同様である。
図3は、励起光Lを蛍光体部120における光照射面120aに対して入射角度θをつけて照射した場合において光照射面120aでの投影光Mの状態を説明するための説明図である。図3(a)は、入射角度θをつけた励起光L及び励起光Lを照射した光照射面120aでの投影光Mを示す概略断面図であり、図3(b)から図3(d)は、それぞれ、投影光Mの形状の長手方向が励起光Lの光照射面120aへの進行方向に沿った光照射方向Wに対して平行又は略平行になっている場合、直交又は略直交している場合、及び、斜めになっている場合での励起光Lの光軸方向に直交する垂直断面及び投影光Mの形状を平面から視た概略平面図である。なお、図3において、光源部110~110を一対の光源部110,110とし、一対の励起光L,L及び一対の投影光M,Mのうち、一方の励起光L及び一方の投影光Mを他方の励起光L及び他方の投影光Mに代表させて示しており、他方の励起光L及び他方の投影光Mは図示を省略している。
この点、第1実施形態に係る発光装置100において、この例では、一対の光源部110,110の投影光M(M1),M(M2)の形状の長手方向が励起光L(L1),L(L2)の光照射面120aへの進行方向に沿った光照射方向Wに対して平行又は略平行になるように構成(具体的には配設、より具体的には調整された状態で配設)されている[図4(a)参照]。
また、第1実施形態に係る発光装置100において、この例では、一対の光源部110,110の投影光M(M1),M(M2)の形状の長手方向が励起光L(L1),L(L2)の光照射面120aへの進行方向に沿った光照射方向Wに対して直交又は略直交するように構成(具体的には配設、より具体的には調整された状態で配設)されている[図4(b)参照]。
ところで、発光装置100を水平方向又は鉛直方向に設ける場合、この例では、一対の光源部110,110を光照射方向Wが水平方向に対して斜めになるように(対角線方向に)配設する場合において、水平方向又は鉛直方向に広い指向特性が望まれる場合がある。従って、光源部110,110を光照射方向Wが水平方向又は鉛直方向に対して斜めになるように配設する場合において水平方向又は鉛直方向に広い指向特性に対応することが望まれる。
第1実施形態に係る発光装置100において、投影光M(M1),M(M2)の形状の長手方向(又は短手方向)の光照射方向Wに対する角度φ(φ1),φ(φ2)[図4(c)参照]が45度又は略45度である。
第1実施形態に係る発光装置100において、光源部110~110は、既述のとおり、レーザ光源111をそれぞれ有する一対の光源部110,110とされている。
第1実施形態に係る発光装置100において、一対の光源部110,110は、一方の光源部110の励起光L(L1)の光照射面120aへの進行方向に沿った光照射方向Wと、他方の光源部110の励起光L(L2)の光照射面120aへの進行方向に沿った光照射方向Wとが平行又は略平行となるように配設されている。
第1実施形態に係る発光装置100において、一対の光源部110,110は、蛍光体部120を間にして一方側及び一方側とは反対側の他方側に位置するように配設されている。
第1実施形態に係る発光装置100において、一対の光源部110,110は、蛍光体部120を間にして互いに対向するように配設されている。
第1実施形態に係る発光装置100において、一対の光源部110,110の励起光L(L1),L(L2)の光軸[すなわち一方側の光源部110の励起光L(L1)の光軸と他方側の光源部110の励起光L(L2)の光軸と]が同一仮想平面又は略同一仮想平面上に位置し、該同一仮想平面又は略同一仮想平面は、蛍光体部120における光照射面120aに対して直交又は略直交している。
第1実施形態に係る発光装置100において、一対の光源部110,110は、線対称又は略線対称[この例では蛍光体部120における光照射面120aの投影光M(M1),M(M2)の中心を通る仮想法線に対して線対称又は略線対称]になるように構成(具体的には配設)されている。
ところで、光源部110~110におけるレーザ光源111~111から出射される励起光L~Lの光軸方向に直交する垂直断面の形状が互いに異なっている場合、及び/又は、蛍光体部120における光照射面120aにそれぞれ照射される励起光L~Lの入射角度θ~θが互いに異なっている場合には、蛍光体部120における光照射面120aでの投影光M~Mが重なった部分からはみ出した部分ができ易く、例えば、一対の光源部110,110のうち、一方の光源部110から光照射面120aに投影される励起光L(L1)の光照射面120aでの投影光M(M1)と、他方の光源部110から光照射面120aに投影される励起光L(L2)の光照射面120aでの投影光M(M2)とを一致又は略一致させることが困難となる。従って、光源部110~110から光照射面120aに投影される励起光L~Lの光照射面120aでの投影光M~Mを互いに一致又は略一致させ易くすることが望まれる。
第1実施形態に係る発光装置100において、光源部110~110は、レーザ光源111~111から出射される励起光L~Lを反射させる反射ミラー112~112をそれぞれ備えている。蛍光体部120は、光源部110~110における反射ミラー112~112から反射される励起光L~Lを受けて蛍光Fを発光する。
第1実施形態に係る発光装置100において、光源部110~110は、レーザ光源111~111が反射ミラー112~112に向けて出射する励起光L~Lが互いに平行又は略平行になるように構成(具体的には配設、より具体的には調整された状態で配設)されている。
第1実施形態に係る発光装置100において、光源部110~110は、レーザ光源111~111が反射ミラー112~112に向けて出射する励起光L~Lが何れも蛍光体部120における光照射面120aに対して直交又は略直交するように構成(具体的には配設、より具体的には調整された状態で配設)されている。
第1実施形態に係る発光装置100において、励起光L~Lを蛍光体部120における光照射面120aに照射して光照射面120aから蛍光Fを出射する反射型の発光原理を用いる。
第1実施形態に係る発光装置100において、既述のとおり、蛍光体部120における光照射面120a及び光照射面120aとは反対側の面120bのうち、蛍光Fを出射する側の面(この例では光照射面120a)からの蛍光Fを投光する投光レンズ170をさらに備えている。
第1実施形態に係る発光装置100において、励起光L~L[この例ではL(L1),L(L2)]の蛍光体部120における光照射面120aへの入射角度θ~θ[この例ではθ(θ1),θ(θ2)]は、投光レンズ170の取り込み角度δ~δ[この例ではδ(δ1),δ(δ2)](図1参照)よりも大きい。
第2実施形態に係る発光装置100において、一対の光源部110,110を複数対(この例では2対)備えている(後述する図5及び図6参照)。
第2実施形態に係る発光装置100において、複数対の光源部(110,110)~(110,110)の少なくとも2組の一対の光源部は[この例では何れの一対の光源部(110,110)~(110,110)も]、励起光(L,L)~(L,L)が蛍光体部120における光照射面120aで重なるように構成(具体的には配設、より具体的には調整された状態で配設)されている。
第2実施形態に係る発光装置100において、複数対の光源部(110,110)~(110,110)は、少なくとも2組の一対の光源部が[この例では何れの一対の光源部(110,110)~(110,110)も]線対称又は略線対称(この例では蛍光体部120における光照射面120aの投影光M~Mの中心を通る仮想法線に対して線対称又は略線対称)になるように構成(具体的には配設)されている。
第2実施形態に係る発光装置100において、複数対の光源部(110,110)~(110,110)は、少なくとも2組の一対の光源部が[この例では何れの一対の光源部(110,110)~(110,110)も]蛍光体部120を間にして互いに対向するように配設されている。
図5は、第2実施形態に係る発光装置100の一例を示す概略構成図であって、図5(a)及び図5(b)は、それぞれ、第1実施形態に係る発光装置100において一対の光源部110,110をさらに備えた一例を示す側面図及び平面図である。
図6及び図7は、図5に示す第2実施形態に係る発光装置100の一例において、光照射面120aに投影される励起光[L(L1),L(L2)],[L(L3),L(L4)]の光照射面120aでの投影光[M(M1),M(M2)],[M(M3),M(M4)]を示す概略平面図である。図6(a)から図6(e)及び図7(a)から図7(d)は、その各例を示している。
図10は、第2実施形態に係る発光装置100の他の例を示す概略構成図であって、図10(a)及び図10(b)は、それぞれ、第1実施形態に係る発光装置100において一対の光源部110,110をさらに備えた他の例を示す側面図及び平面図である。
図11及び図12は、図10に示す第2実施形態に係る発光装置100の他の例において、光照射面120aに投影される励起光[L(L1),L(L2)],[L(L3),L(L4)]の光照射面120aでの投影光[M(M1),M(M2)],[M(M3),M(M4)]を示す概略平面図である。図11(a)から図11(e)及び図12(a)から図12(d)は、その各例を示している。
図13は、第3実施形態に係る発光装置100を示す概略構成図であって、光源部110~110からの励起光L~Lを蛍光体部120における光照射面120aに直接的に照射する例を示す断面図である。
図14は、第4実施形態に係る発光装置100を示す概略構成図であって、透過型の構成例を示す断面図である。
図15は、第5実施形態に係る発光装置100を示す概略構成図であって、一対の光源部110,110の光照射方向W,Wが交差する例を示す側面図である。
図16は、第6実施形態に係る発光装置100を示す概略構成図であって、リフレクター180を備えた例を示す側面図である。
以上説明した本実施の形態に係る発光装置100は、自動車以外の車両用前照灯に適用してもよい。さらに、発光装置100は、それには限定されないが、例えば、投光器、車両以外の移動物体(具体的には人間、船舶、航空機、潜水艇、ロケットといった移動体)のヘッドランプ、サーチライト、プロジェクタ、或いは、ダウンライト、スタンドランプといった室内照明器具などの照明装置に適用することができる。
110 光源部
111 レーザ光源
111a 半導体レーザ素子
111b 光射出口
112 反射ミラー
120 蛍光体部
120a 光照射面
120b 光照射面とは反対側の面
130 本体シャーシ
131 収容部
132 励起光用通過孔
133 投影光用通過孔
140 光源ユニット
141 コリメートレンズ
142 ねじ構造
150 押えプレート
160 ミラーユニット
161 保持部材
170 投光レンズ
180 リフレクター
180a 開口部
F 蛍光
Kmax 最長の直線
L 励起光
M 投影光
SC 固定部材
W 光照射方向
X 対向方向
α 仮想直線
δ 取り込み角度
θ 入射角度
φ 角度
Claims (5)
- 励起光を出射するレーザ光源をそれぞれ有する複数の光源部と、
前記励起光を受けて蛍光を発光する蛍光体部と
を備え、
前記複数の光源部のうち少なくとも2つの光源部は、前記励起光を前記蛍光体部における光照射面にそれぞれ照射したときに該励起光が該光照射面で重なるように、且つ、該光照射面に投影される該励起光の該光照射面での投影光の長尺な形状の長手方向が互いに平行又は略平行になるように構成されていることを特徴とする発光装置。 - 請求項1に記載の発光装置であって、
前記複数の光源部は、全ての前記投影光の形状の長手方向が平行又は略平行になるように構成されていることを特徴とする発光装置。 - 請求項2に記載の発光装置であって、
前記投影光の形状の長手方向が、前記蛍光が外部に投光された場合に水平方向又は略水平方向となるように構成されていることを特徴とする発光装置。 - 請求項1に記載の発光装置であって、
前記少なくとも2つの光源部の前記投影光の形状の長手方向が前記励起光の前記光照射面への進行方向に沿った光照射方向に対して平行又は略平行になるように構成されていることを特徴とする発光装置。 - 請求項1に記載の発光装置であって、
前記少なくとも2つの光源部の前記投影光の形状の長手方向が前記励起光の前記光照射面への進行方向に沿った光照射方向に対して直交又は略直交するように構成されていることを特徴とする発光装置。
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JP2011165548A (ja) * | 2010-02-12 | 2011-08-25 | Seiko Epson Corp | 光源装置およびプロジェクター |
JP5840179B2 (ja) * | 2010-10-29 | 2016-01-06 | シャープ株式会社 | 発光装置 |
JP2012109201A (ja) * | 2010-10-29 | 2012-06-07 | Sharp Corp | 発光装置、車両用前照灯、照明装置およびレーザ素子 |
JP2012169050A (ja) * | 2011-02-10 | 2012-09-06 | Stanley Electric Co Ltd | 車両用灯具 |
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EP2930801A1 (en) * | 2013-04-01 | 2015-10-14 | LG Electronics Inc. | Laser light source device |
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