US20210109430A1 - Light source device and projector - Google Patents
Light source device and projector Download PDFInfo
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- US20210109430A1 US20210109430A1 US16/464,334 US201716464334A US2021109430A1 US 20210109430 A1 US20210109430 A1 US 20210109430A1 US 201716464334 A US201716464334 A US 201716464334A US 2021109430 A1 US2021109430 A1 US 2021109430A1
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- United States
- Prior art keywords
- light
- wavelength conversion
- conversion layer
- transmissive member
- incident surface
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3152—Modulator illumination systems for shaping the light beam
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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
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
-
- 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
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3164—Modulator illumination systems using multiple light sources
Definitions
- This invention relates to a light source device and a projector.
- wavelength conversion efficiency light emission efficiency
- a phenomenon that, even when many lights enter the wavelength conversion layer, not all of the lights can be wavelength-converted occurs.
- a heat dissipation member is provided around the wavelength conversion layer to suppress a temperature rise of the wavelength conversion layer, the wavelength conversion efficiency may decrease unless the optical density of the excitation light in the light incident surface of the wavelength conversion layer is reduced.
- the invention has been achieved in view of the above described problem of related art, and one of purposes is to provide a light source device that may suppress decrease of wavelength conversion efficiency by reducing optical density of excitation light in a light incident surface of a wavelength conversion layer.
- One of purposes of an aspect of the invention is to provide a projector including the light source device.
- a light source device in one aspect of the invention includes an excitation light source that outputs an excitation light, a collecting system that collects the excitation light, a light-transmissive member that transmits the excitation light output from the collecting system, and a wavelength conversion layer having a first light incident surface crossing a traveling direction of the excitation light, a light exiting surface opposed to the first light incident surface, and a second light incident surface coupling an end portion of the first light incident surface and an end portion of the light exiting surface, wherein a focal point of the collecting system is formed inside of the wavelength conversion layer, and the wavelength conversion layer wavelength-converts the excitation light entering from the first light incident surface and the second light incident surface and generates a fluorescent light.
- the focal point of the collecting system is formed inside of the wavelength conversion layer, and accordingly, the excitation light transmitted through the light-transmissive member from the collecting system enters from both the first light incident surface and the second light incident surface of the wavelength conversion layer and optical density may be made lower compared to the case where the light incident surface is only the first light incident surface.
- occurrence of the above described light saturation phenomenon may be suppressed and decrease of wavelength conversion efficiency in the wavelength conversion layer may be suppressed.
- the focal point of the collecting system may be formed inside of the wavelength conversion layer except the first light incident surface of the wavelength conversion layer, but including the light exiting surface on an optical axis of the excitation light.
- the focal point of the collecting system may be formed on the light exiting surface.
- the excitation light enters from respective different positions on the first light incident surface and the second light incident surface, and incident locations of the excitation light into the wavelength conversion layer may be distributed.
- the optical density on the first light incident surface and the second light incident surface may be reduced. Therefore, occurrence of the light saturation phenomenon may be suppressed and decrease of wavelength conversion efficiency in the wavelength conversion layer may be suppressed.
- a support member that supports the wavelength conversion layer and the light-transmissive member may be further provided at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light.
- heat generated in the wavelength conversion layer may be dissipated via the support member, and thereby, non-uniformity of a temperature of the wavelength conversion layer in the same amount of excitation light may be suppressed and fluctuations of the conversion efficiency of the wavelength conversion layer may be suppressed.
- the light-transmissive member may have a first light-transmissive member having a planar surface crossing the traveling direction of the excitation light and a curved surface projecting in an opposite direction to the traveling direction of the excitation light, and placed with the planar surface opposed to the first light incident surface, and a second light-transmissive member placed on a side of the planar surface of the first light-transmissive member and having a hole penetrating in a direction along the optical axis, in a state in which the wavelength conversion layer is placed within the hole, the second light incident surface of the wavelength conversion layer may be opposed to an inner circumferential surface of the hole.
- the first light-transmissive member and the second light-transmissive member are provided, and thereby, the second light-transmissive member may be easily placed around the wavelength conversion layer.
- a support member that supports the wavelength conversion layer and the light-transmissive member may be further provided at a side of the second light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light, and the first light-transmissive member may be joined to the support member via a joining member.
- the joining member does not necessarily have light transmissivity, and accordingly, the joining member having higher heat conductivity may be used, the heat generated in the wavelength conversion layer may be efficiently transferred to the respective support member and light-transmissive member, and fluctuations of the conversion efficiency of the wavelength conversion layer may be suppressed.
- the light-transmissive member may have a planar surface crossing the traveling direction of the excitation light, a concave portion opening in the planar surface, and a curved surface projecting in an opposite direction to the traveling direction of the excitation light, and, in a state in which the wavelength conversion layer is placed within the concave portion, the first light incident surface may be opposed to a bottom surface of the concave portion and the second light incident surface may be opposed to an inner circumferential surface of the concave portion.
- the wavelength conversion layer is placed within the concave portion formed in the light-transmissive member, and thereby, the light-transmissive member may be handled as a single member.
- a support member that supports the wavelength conversion layer and the light-transmissive member may be further provided at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light, and the light-transmissive member may have a second concave portion for placement of the support member.
- a contact area between the light-transmissive member and the support member is increased by the second concave portion, and thereby, a heat dissipation property of the wavelength conversion layer via the light-transmissive member may be improved and a temperature rise of the wavelength conversion layer may be suppressed.
- the light-transmissive member may be formed using sapphire.
- the light-transmissive member is formed using the sapphire having higher heat conductivity, and thereby, the heat dissipation property in the light-transmissive member may be improved.
- a dielectric multilayer film that transmits the excitation light and reflects the fluorescent light may be provided between the first light incident surface of the wavelength conversion layer and the light-transmissive member and the second light incident surface of the wavelength conversion layer and the light-transmissive member.
- output of the excitation light (fluorescent light) converted by the wavelength conversion layer toward the light-transmissive member may be suppressed, the fluorescent light may be reliably output from the light exiting surface, and the decrease of the wavelength conversion efficiency in the light source device may be suppressed.
- a projector of the invention includes the above described light source, a light modulation device that modulates a light output from the light source device according to image information and generates an image light, and a projection system that projects the image light.
- the projector including the light source device having excellent wavelength conversion efficiency may be obtained, and the projector with higher reliability may be provided.
- FIG. 1 is a schematic configuration diagram showing a projector of a first embodiment.
- FIG. 2 shows a schematic configuration of a light source device in the first embodiment.
- FIG. 3 is a sectional view of a wavelength conversion element in the first embodiment cut along a plane containing an illumination light axis in FIG. 2 .
- FIG. 4 shows a configuration of a light source device in a second embodiment.
- FIG. 5 is a sectional view of a wavelength conversion element in the second embodiment cut along a plane containing an illumination light axis in FIG. 4 .
- FIG. 6 shows a configuration of a wavelength conversion element of modified example 1.
- FIG. 7 shows a configuration of a wavelength conversion element of modified example 2.
- a projector of the embodiment is an example of a projector using three transmissive liquid crystal light valves as light modulation devices.
- the light modulation devices reflective liquid crystal light valves may be used.
- other light modulation devices including devices using micromirrors e.g. DMDs (Digital Micromirror Devices) or the like than the liquid crystal devices may be used.
- FIG. 1 is the schematic configuration diagram showing the projector of the first embodiment.
- a projector 1 includes a light source device 2 A, a color separation system 3 , a light modulation device 4 R, a light modulation device 4 G, a light modulation device 4 B, a color combining system 5 , and a projection system 6 .
- the light source device 2 A outputs an illumination light WL.
- the color separation system 3 separates the illumination light WL from the light source device 2 A into a red light LR, a green light LG, and a blue light LB.
- the light modulation device 4 R, the light modulation device 4 G, and the light modulation device 4 B modulate the red light LR, the green light LG, and the blue light LB according to image information, respectively, and form image lights of the respective colors.
- the color combining system 5 combines the image lights of the respective colors from the respective light modulation devices 4 R, 4 G, 4 B.
- the projection system 6 projects the combined image light from the color combining system 5 toward a screen SCR.
- the light source device 2 A outputs the white illumination light (white light) WL formed by combination of part of a blue excitation light B output without being wavelength-converted of the blue excitation lights output from a semiconductor laser and a yellow fluorescent light Y generated by wavelength conversion of the excitation light B by a wavelength conversion element 30 .
- the light source device 2 A outputs the illumination light WL adjusted to have a substantially uniform illuminance distribution toward the color separation system 3 . The specific configuration of the light source device 2 A will be described later.
- the color separation system 3 includes a first dichroic mirror 7 a , a second dichroic mirror 7 b , a first reflection mirror 8 a , a second reflection mirror 8 b , a third reflection mirror 8 c , a first relay lens 9 a , and a second relay lens 9 b.
- the first dichroic mirror 7 a separates the illumination light WL output from the light source device 2 A into the red light LR and a light of a mixture of the green light LG and the blue light LB.
- the first dichroic mirror 7 a has a property of transmitting the red light LR and reflecting the green light LG and the blue light LB.
- the second dichroic mirror 7 b separates the light of the mixture of the green light LG and the blue light LB into the green light LG and the blue light LB.
- the second dichroic mirror 7 b has a property of reflecting the green light LG and transmitting the blue light LB.
- the first reflection mirror 8 a is placed in an optical path of the red light LR and reflects the red light LR transmitted through the first dichroic mirror 7 a toward the light modulation device 4 R.
- the second reflection mirror 8 b and the third reflection mirror 8 c are placed in an optical path of the blue light LB and guides the blue light LB transmitted through the second dichroic mirror 7 b to the light modulation device 4 B.
- the first relay lens 9 a and the second relay lens 9 b are placed at the downstream of the second dichroic mirror 7 b in the optical path of the blue light LB.
- the first relay lens 9 a and the second relay lens 9 b compensate for light loss of the blue light LB due to the optical path length of the blue light LB longer than the optical path lengths of the red light LR and the green light LG.
- the respective light modulation device 4 R, light modulation device 4 G, and light modulation device 4 B include liquid crystal panels.
- the respective light modulation device 4 R, light modulation device 4 G, and light modulation device 4 B modulate the respective red light LR, green light LG, and blue light LB according to image information while passing the respective red light LR, green light LG, and blue light LB, and form image lights corresponding to the respective colors.
- Polarizers (not shown) are respectively provided on light-incident sides and light-exiting sides of the respective light modulation device 4 R, light modulation device 4 G, and light modulation device 4 B.
- a field lens 10 R, a field lens 10 G, and a field lens 10 B that parallelize the respective red light LR, green light LG, and blue light LB entering the respective light modulation device 4 R, light modulation device 4 G, and light modulation device 4 B are provided on the light-incident sides of the respective light modulation device 4 R, light modulation device 4 G, and light modulation device 4 B.
- the color combining system 5 includes a cross dichroic prism.
- the color combining system 5 combines the image lights of the respective colors from the respective light modulation device 4 R, light modulation device 4 G, and light modulation device 4 B, and outputs the combined image light toward the projection system 6 .
- the projection system 6 includes a group of projection lenses.
- the projection system 6 enlarges and projects the image light combined by the color combining system 5 toward the screen SCR. Thereby, an enlarged color picture (image) is displayed on the screen SCR.
- FIG. 2 shows the schematic configuration of the light source device in the first embodiment.
- the light source device 2 A includes an excitation light source 110 , an afocal system 11 , a homogenizer system 12 , a collecting system 20 , the wavelength conversion element 30 , a pickup system 60 , a first lens array 120 , a second lens array 130 , a polarization conversion element 140 , and a superimposing lens 150 .
- the excitation light source 110 includes a plurality of semiconductor lasers 110 A that output the blue excitation lights B of laser beams.
- a peak of light emission intensity of the excitation light B is e.g. 445 nm.
- the plurality of semiconductor lasers 110 A are arranged in an array form within one plane orthogonal to an illumination light axis 100 ax .
- semiconductor lasers that output blue lights having other wavelengths e.g. 455 nm or 460 nm than 445 nm may be used.
- LEDs Light Emitting Diodes
- the afocal system 11 includes e.g. a convex lens 11 a and a concave lens 11 b .
- the afocal system 11 reduces the diameter of a luminous flux of a plurality of laser beams output from the excitation light source 110 .
- a collimator system may be placed between the afocal system 11 and the excitation light source 110 to convert the excitation light entering the afocal system 11 into a parallel luminous flux.
- the homogenizer system 12 includes e.g. a first multi-lens array 12 a and a second multi-lens array 12 b .
- the homogenizer system 12 sets the light intensity distribution of the excitation light to a homogeneous state on a wavelength conversion layer, which will be described later, the so-called top-hat distribution.
- the homogenizer system. 12 superimposes a plurality of small luminous fluxes output from the plurality of lenses of the first multi-lens array 12 a and the second multi-lens array 12 b on each other on the wavelength conversion layer with the collecting system 20 . Thereby, the light intensity distribution of the excitation light B radiated onto the wavelength conversion layer is homogenized.
- the collecting system 20 includes e.g. a first lens 20 a and a second lens 20 b .
- the collecting system 20 is provided in an optical path from the homogenizer system 12 to the wavelength conversion element 30 , collects and enters the excitation light B into the wavelength conversion layer of the wavelength conversion element 30 .
- the first lens 20 a and the second lens 20 b are respectively formed using convex lenses.
- the pickup system 60 includes e.g. a first collimating lens 62 and a second collimating lens 64 .
- the pickup system substantially parallelizes the light output from the wavelength conversion element 30 .
- the first collimating lens 62 and the second collimating lens 64 are respectively formed using convex lenses.
- the first lens array 120 has a plurality of first lenses 122 for dividing the light output from the pickup system 60 into a plurality of partial luminous fluxes.
- the plurality of first lenses 122 are arranged in a matrix form within a plane orthogonal to the illumination light axis 100 ax.
- the second lens array 130 has a plurality of second lenses 132 corresponding to the plurality of first lenses 122 of the first lens array 120 .
- the second lens array 130 forms images of the respective first lenses 122 of the first lens array 120 near image formation areas of the light modulation device 4 R, the light modulation device 4 G, and the light modulation device 4 B with the superimposing lens 150 .
- the plurality of second lenses 132 are arranged in a matrix form within a plane orthogonal to the illumination light axis 100 ax.
- the polarization conversion element 140 converts the lights output from the second lens array 130 into linearly-polarized lights.
- the polarization conversion element 140 includes e.g. a polarization separation film and a wave plate (both not shown).
- the superimposing lens 150 collects and superimposes the respective partial luminous fluxes output from the polarization conversion element 140 near the image formation areas of the light modulation device 4 R, the light modulation device 4 G, and the light modulation device 4 B.
- FIG. 3 is the sectional view of the wavelength conversion element 30 in the first embodiment cut along the plane containing the illumination light axis 100 ax in FIG. 2 .
- the wavelength conversion element 30 includes a support member 31 , a light-transmissive member 33 , a wavelength conversion layer 32 , a dichroic film 34 A, and a first anti-reflection film 34 C.
- the support member 31 is formed using a rectangular plate material and has a first surface 31 a and a second surface 31 b facing each other in a direction of a plate thickness.
- the support member 31 is placed with the first surface 31 a toward the collecting system. 20 and the second surface 31 b toward the pickup system 60 .
- a hole 31 h penetrating in the thickness direction between the first surface 31 a and the second surface 31 b is provided in the support member 31 .
- the shape of the hole 31 h is rectangular as seen from a normal direction of the first surface 31 a.
- the support member 31 may be formed using a material with light transmissivity such as glass or quartz, or may be formed using a material without light transmissivity such as metal.
- a material with a good heat dissipation property such as aluminum or copper is desirably used.
- the wavelength conversion layer 32 is provided and supported inside of a through hole 33 h of a second light-transmissive member 33 B.
- the shape of the wavelength conversion layer 32 is rectangular as seen from a normal direction of a light exiting surface 32 b of the wavelength conversion layer 32 .
- the wavelength conversion layer 32 has a first light incident surface 32 a crossing an optical axis of the excitation light B or a traveling direction of the excitation light B output from the excitation light source 110 , the light exiting surface 32 b opposed to the first light incident surface 32 a , and second light incident surfaces 32 c coupling the first light incident surface 32 a and the light exiting surface 32 b .
- the first light incident surface 32 a is opposed to a planar surface 33 f of a first light-transmissive member 33 A, which will be described later.
- the second light incident surfaces 32 c are used as light incident surfaces separately from the first light incident surface 32 a , and the area into which the excitation light B is entered is larger compared to a configuration using only the first light incident surface 32 a as the light incident surface.
- the light exiting surface 32 b is formed on the same plane as the second surface 31 b of the support member 31 .
- the shape of the wavelength conversion layer 32 is not limited to the rectangular shape as shown in the drawing, but the second light incident surfaces 32 c may be surfaces having different orientations relative to the optical axis from the first light incident surface 32 a and inclined at a predetermined angle toward the traveling direction of the excitation light relative to the first light incident surface 32 a.
- the blue excitation light B output from the excitation light source 110 is entered from the first light incident surface 32 a and the second light incident surfaces 32 c , and the yellow fluorescent light Y after wavelength conversion is output from the light exiting surface 32 b .
- the wavelength conversion layer 32 contains fluorescent material particles (not shown) that convert and output the blue excitation light B into the yellow fluorescent light Y.
- the fluorescent material particles e.g. a YAG (yttrium aluminum garnet) fluorescent material is used.
- a material forming the fluorescent material particles a single kind of material may be used or mixture of particles formed using two or more kinds of materials may be used. It is preferable to use a material having good heat resistance and surface workability for the wavelength conversion layer 32 .
- a fluorescent material layer in which fluorescent material particles are dispersed in an inorganic binder such as alumina, a fluorescent material layer in which fluorescent material particles are sintered without using a binder, or the like is preferably used.
- the dichroic film 34 A is provided on the first light incident surface 32 a and the four second light incident surfaces 32 c of the wavelength conversion layer 32 .
- the dichroic film 34 A has a property of transmitting the blue excitation light B output from the excitation light source 110 and reflecting the yellow fluorescent light Y generated in the wavelength conversion layer 32 .
- the light-transmissive member 33 includes the first light-transmissive member 33 A having a semi-spherical shape, and the second light-transmissive member 33 B having a square tube shape.
- the first light-transmissive member 33 A includes a plano-convex lens having a semi-spherical shape in a sectional view, and has the planar surface 33 f and a convex surface 33 d .
- the first light-transmissive member 33 A is provided with the planar surface 33 f opposed to the first light incident surface 32 a of the wavelength conversion layer 32 and fixed to the first surface 31 a side of the support member 31 .
- the convex surface 33 d of the first light-transmissive member 33 A is a curved surface projecting in an opposite direction to the traveling direction of the excitation light B.
- the center of the radius of curvature of the convex surface 33 d is formed on the light exiting surface 32 b of the wavelength conversion layer 32 .
- the second light-transmissive member 33 B has the square tube shape along the outer shape of the wavelength conversion layer 32 , and has the through hole 33 h penetrating in the thickness direction of the wavelength conversion layer 32 along the optical axis.
- the dimension of the second light-transmissive member 33 B in a direction crossing the optical axis (traveling direction of light) is appropriately set.
- An inner circumferential surface 33 i of the through hole 33 h is opposed to the four second light incident surfaces 32 c forming the outer circumferential surface of the wavelength conversion layer 32 .
- the support member 31 is provided on a side of the second light-transmissive member 33 B opposite to the wavelength conversion layer 32 .
- the second light-transmissive member 33 B has a planar surface 33 c crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, and the planar surface 33 c is formed on the same plane as the second surface 31 b of the support member 31 .
- first light-transmissive member 33 A and second light-transmissive member 33 B are placed with the center axes aligned with each other on the optical axis of the excitation light B.
- the light-transmissive member 33 i.e., both the first light-transmissive member 33 A and second light-transmissive member 33 B of the embodiment are formed using sapphire having higher heat conductivity.
- the first anti-reflection film 34 C is provided on the planar surface 33 f of the first light-transmissive member 33 A.
- the first anti-reflection film 34 C has a property of suppressing reflection of the excitation light B, and transmission efficiency of the excitation light B is improved by deposition of the film on the planar surface 33 f of the first light-transmissive member 33 A.
- an anti-reflection film may be provided on the light exiting surface 32 b of the wavelength conversion layer 32 .
- a second anti-reflection film 34 D is provided to cover the inner circumferential surface of the second light-transmissive member 33 B.
- the second anti-reflection film 34 D suppresses reflection of the excitation light B transmitted through the second light-transmissive member 33 B and entering the second light incident surfaces 32 c of the wavelength conversion layer 32 .
- the transmission efficiency of the excitation light B is improved by deposition of the second anti-reflection film 34 D to be opposed to the second light incident surfaces 32 c of the wavelength conversion layer 32 .
- the wavelength conversion layer is fitted in the through hole 33 h of the second light-transmissive member 33 B, even when an air layer intervenes between the dichroic film 34 A and the second anti-reflection film 34 D, the anti-reflection effect for the excitation light B transmitted through the second light-transmissive member 33 B may be maintained.
- a joining member 36 is provided between the first anti-reflection film 34 C provided on the first light-transmissive member 33 A and the first surface 31 a of the support member 31 and joins the first light-transmissive member 33 A to the support member 31 .
- a member having higher thermal conductivity is preferable.
- the member includes e.g. solder and a thermally conductive sheet. The material having higher thermal conductivity is used, and thereby, heat generated in the wavelength conversion layer 32 may be efficiently transferred from the support member 31 to the first light-transmissive member 33 A and the heat dissipation property of the wavelength conversion layer 32 may be improved.
- the joining member 36 provided between the second light-transmissive member 33 B and the planar surface 33 f (first anti-reflection film 34 C) of the first light-transmissive member 33 A should have light transmissivity.
- the joining member 36 provided between the support member 31 (first surface 31 a ) and the planar surface 33 f (first anti-reflection film 34 C) of the first light-transmissive member 33 A has light transmissivity does not matter.
- a focal point of the collecting system 20 is formed not on the first light incident surface 32 a of the wavelength conversion layer 32 , but inside of the wavelength conversion layer 32 including the light exiting surface 32 b closer to the side in the traveling direction of light than the first light incident surface 32 a . That is, the focal point of the collecting system 20 may be located in a position inside of the wavelength conversion layer 32 except the first light incident surface 32 a and further on the optical axis of the excitation light B.
- a focal point Q of the collecting system 20 is formed at the center of the light exiting surface 32 b of the wavelength conversion element 30 . Accordingly, the excitation light B output from the collecting system 20 is transmitted through the first light-transmissive member 33 A and output from the planar surface 33 f toward the wavelength conversion layer 32 and the second light-transmissive member 33 B.
- a center luminous flux enters the wavelength conversion layer 32 from the first light incident surface 32 a
- peripheral luminous fluxes enters the first light incident surface 32 a
- the focal point Q of the collecting system 20 is set on the light exiting surface 32 b of the wavelength conversion layer 32 and a light intensity distribution in a top-hat shape is formed on the light exiting surface 32 b , and thereby, optical density of the excitation light B concentrated on the first light incident surface 32 a of the wavelength conversion layer 32 in related art may be dispersed on the second light incident surfaces 32 c.
- the second light-transmissive member 33 B is provided around the optical axis of the wavelength conversion layer 32 , and thereby, the side surfaces of the wavelength conversion layer 32 may be used as the second light incident surfaces 32 c and the excitation light B may be respectively entered from the first light incident surface 32 a and the second light incident surfaces 32 c .
- the focal point Q of the collecting system 20 is formed on the light exiting surface 32 b , and thereby, the respective beams (B 31 to B 33 ) of the excitation light B may respectively enter from on the first light incident surface 32 a and the second light incident surfaces 32 c.
- the focal point of the collecting system 20 is formed inside of the wavelength conversion layer 32 on the optical axis of the excitation light B. That is, the focal point of the collecting system 20 is formed inside of the wavelength conversion layer 32 except the first light incident surface 32 a , but including the light exiting surface 32 b , and thereby, the optical density of the excitation light B on the first light incident surface 32 a of the wavelength conversion layer 32 becomes lower. Accordingly, occurrence of a light saturation phenomenon may be suppressed and substantially all of the excitation light B entering the wavelength conversion layer 32 may be efficiently converted. Therefore, decrease and fluctuations of wavelength conversion efficiency of the wavelength conversion element 30 may be suppressed and wavelength conversion efficiency of the wavelength conversion element 30 (wavelength conversion layer 32 ) may be improved without reduction of the amount of excitation light B entering the wavelength conversion layer 32 .
- the light saturation phenomenon may be suppressed by increase of the area of the first light incident surface 32 a , however, if the area of the first light incident surface 32 a is increased, the size of the light-transmissive member 33 (particularly, the first light-transmissive member 33 A) proportionally increases and the wavelength conversion element 30 is upsized. Therefore, the side surfaces (second light incident surfaces 32 c ) of the wavelength conversion layer 32 are effectively used as the light incident surfaces.
- the second light-transmissive member 33 B is formed using sapphire having higher heat conductivity. Accordingly, the heat generated in the wavelength conversion layer 32 may be not only dissipated from the first light-transmissive member 33 A but also transferred to the support member 31 provided on the side of the second light-transmissive member 33 B opposite to the wavelength conversion layer 32 via the second light-transmissive member 33 B and dissipated in the support member 31 .
- the heat generated in the wavelength conversion layer 32 may be efficiently dissipated in the first light-transmissive member 33 A and the support member 31 via the second light-transmissive member 33 B, and thereby, non-uniformity of the temperature of the wavelength conversion layer 32 in the same amount of excitation light may be suppressed and decrease and fluctuations of the conversion efficiency of the wavelength conversion element 30 may be further suppressed.
- the focal point Q of the collecting system 20 is formed on the light exiting surface 32 b of the wavelength conversion layer 32 and the top-hat distribution is formed on the light exiting surface 32 b , however, the configuration is not limited to that.
- the focal point may be formed in any position inside of the wavelength conversion layer 32 on the optical axis of the collecting system 20 except the first light incident surface 32 a of the wavelength conversion layer 32 .
- the light exiting surface 32 b of the wavelength conversion layer 32 does not necessarily coincide with the planar surface 33 c or the second surface 31 b .
- the light exiting surface 32 b may be provided closer to a side opposite to the traveling direction of the excitation light B than the planar surface 33 c or the second surface 31 b.
- Alight source device 2 B of the embodiment shown as below is different from the configuration of the above described first embodiment in that the blue-separation light source device 2 B is provided. Accordingly, in the following explanation, the configuration of the light source device 2 B will be specifically explained, and the explanation of the common parts will be omitted. Further, in the respective drawings used in the explanation, the component elements in common with FIGS. 1 to 3 have the same signs.
- FIG. 4 shows the configuration of the light source device 2 B in the second embodiment.
- the light source device 2 B generally includes the excitation light source 110 , a collimator system 42 , a wave plate 43 , a polarization separation element 44 , a first homogenizer system 45 , a first collecting system 46 , a wavelength conversion element 70 , a first pickup lens 48 , a dichroic mirror 49 , a total reflection mirror 50 , a second wave plate 51 , a second homogenizer system 52 , a second collecting system 53 , a reflection rotatory diffusion element 54 , and a second pickup lens 55 .
- the excitation light source 110 the collimator system 42 , the wave plate 43 , the polarization separation element 44 , the first homogenizer system 45 , the first collecting system 46 , the wavelength conversion element 70 , the first pickup lens 48 , and the dichroic mirror 49 are sequentially arranged on the illumination light axis 100 ax.
- the wave plate 43 includes a half wave plate having a rotation mechanism.
- the wave plate 43 converts P-polarized lights and S-polarized lights of the excitation lights B collected by the collimating system 42 at an arbitrary ratio.
- the wave plate 43 may be a quarter wave plate, and is not particularly limited as long as the plate may change the polarization states (the ratio of P-polarized lights and S-polarized lights) by rotation and movement.
- the polarization separation element 44 is the so-called plate-type polarizing beam splitter (PBS) and has an inclined surface at an angle of 45° relative to the illumination light axis 100 ax .
- the polarization separation element 44 passes the P-polarized light component of the incident light and reflects the S-polarized light component.
- the P-polarized light component is transmitted through the polarization separation element 44 and travels toward the first homogenizer system. 45 .
- the S-polarized light component is reflected by the polarization separation element 44 and travels toward the total reflection mirror 50 .
- the first homogenizer system 45 includes e.g. a first multi-lens array 45 a and a second multi-lens array 45 b .
- the first homogenizer system 45 sets the light intensity distribution of the excitation light B to a homogeneous state on the wavelength conversion layer, which will be described later, the so-called top-hat distribution.
- the first homogenizer system 45 superimposes a plurality of small luminous fluxes output from the plurality of lenses of the first multi-lens array 45 a and the second multi-lens array 45 b on each other on the wavelength conversion layer to be described later with the first collecting system 46 . Thereby, the light intensity distribution of the excitation light B radiated onto the wavelength conversion layer to be described later is homogenized.
- the first collecting system 46 is placed in an optical path from the first homogenizer system 45 to the wavelength conversion element 70 , collects and enters the excitation light B into the wavelength conversion layer of the wavelength conversion element 70 .
- the first collecting system 46 is formed using a convex lens.
- the first pickup lens 48 includes e.g. a convex lens and substantially parallelizes the yellow light Y output from the wavelength conversion element 70 .
- the dichroic mirror 49 is a mirror that passes the yellow light Y output from the wavelength conversion element 70 and reflects the blue light B entering from a direction orthogonal to the yellow light Y in the same traveling direction as that of the yellow light Y.
- the total reflection mirror 50 is placed in an optical path of the blue light B and totally reflects the blue light separated in the polarization separation element 44 toward the second wave plate 51 .
- the second wave plate 51 is a quarter wave plate ( ⁇ /4 plate).
- the second wave plate 51 converts the S-polarized blue light B output from the polarization separation element 44 into circularly-polarized light.
- the second homogenizer system 52 includes e.g. a first multi-lens array 52 a and a second multi-lens array 52 b .
- the second homogenizer system 52 superimposes a plurality of small luminous fluxes output from a plurality of lenses of the first multi-lens array 52 a and the second multi-lens array 52 b on each other on the reflection rotatory diffusion element 54 with the second collecting system 53 . Thereby, the light intensity distribution of the blue light B radiated onto the reflection rotatory diffusion element 54 is homogenized.
- the second collecting system 53 is placed in an optical path from the second homogenizer system 52 to the reflection rotatory diffusion element 54 , collects and enters the blue light B that has been converted into the circularly-polarized light into the reflection rotatory diffusion element 54 .
- the second collecting system 53 is formed using a convex lens.
- the reflection rotatory diffusion element 54 diffusionally reflects the beam output from the second collecting system 53 toward the second pickup lens 55 .
- the reflection rotatory diffusion element 54 it is preferable to use an element that diffusionally reflects the beam entering the reflection rotatory diffusion element 54 with characteristics of Lambert's reflection or closer to Lambert's reflection.
- the second pickup lens 55 includes e.g. a convex lens and substantially parallelizes the blue light B output from the reflection rotatory diffusion element 54 .
- the parallelized blue light B travels to the dichroic mirror 49 and is reflected in the dichroic mirror 49 in the same direction as that of the yellow light Y traveling in the direction orthogonal to the blue light B.
- the beam (blue light B) output from the reflection rotatory diffusion element 54 is combined with the yellow fluorescent light Y transmitted through the dichroic mirror 49 , and the white illumination light WL is obtained.
- the white illumination light WL enters the color separation system 3 shown in FIG. 1 .
- FIG. 5 is the sectional view showing the configuration of the wavelength conversion element 70 in the second embodiment.
- the wavelength conversion element 70 includes the support member 31 , a light-transmissive member 73 , the wavelength conversion layer 32 , the dichroic film 34 A, the first anti-reflection film 34 C, the second anti-reflection film 34 D, and a joining member 76 .
- the light-transmissive member 73 has a first light-transmissive part 73 A and a second light-transmissive part 73 B that transmit excitation light.
- the second light-transmissive part 73 B has a square tube shape, and has a planar surface 73 a crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, a first concave portion 73 h 1 opening in a rectangular shape in the planar surface 73 a , and a second concave portion 73 h 2 formed in a rectangular shape over a peripheral edge.
- the planar surface 73 a is formed on the same plane as the second surface 31 b of the support member 31 .
- the light exiting surface 32 b is formed on the same plane as the second surface 31 b of the support member 31 .
- the light exiting surface 32 b of the wavelength conversion layer 32 does not necessarily coincide with the planar surface 73 a or the second surface 31 b .
- the light exiting surface 32 b may be provided closer to a side opposite to the traveling direction of the excitation light B than the planar surface 73 a or the second surface 31 b.
- the first light-transmissive part 73 A has a planar surface 73 f forming a part of the second concave portion 73 h 2 and crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, and a curved surface 73 d projecting in the opposite direction to the traveling direction of the excitation light B.
- the light-transmissive member 73 has an integrated structure of the first light-transmissive part 73 A and the second light-transmissive part 73 B.
- the wavelength conversion layer 32 is placed within the first concave portion 73 h 1 formed on the second light-transmissive part 73 B side of the light-transmissive member 73 .
- the first light incident surface 32 a is opposed to a bottom surface 73 b of the first concave portion 73 h 1 via the dichroic film 34 A and the second anti-reflection film 34 D, which will be described later
- the second light incident surfaces 32 c are opposed to an inner circumferential surface 73 c of the first concave portion 73 h 1 via the dichroic film 34 A and the second anti-reflection film 34 D to be described later.
- the dichroic film 34 A is provided on the first light incident surface 32 a and the second light incident surfaces 32 c of the wavelength conversion layer 32
- the second anti-reflection film 34 D is provided on the dichroic film 34 A.
- the dichroic film 34 A is provided on the first light incident surface 32 a and the second light incident surfaces 32 c of the wavelength conversion layer 32 .
- the dichroic film 34 A has the property of transmitting the blue excitation light B output from the excitation light source 110 and reflecting the yellow fluorescent light Y generated in the wavelength conversion layer 32 .
- the second anti-reflection film 34 D is provided to cover the outer surface of the dichroic film 34 A provided on the first light incident surface 32 a and the second light incident surfaces 32 c of the wavelength conversion layer 32 .
- the second anti-reflection film 34 D suppresses reflection of an excitation light B 71 transmitted through the first light-transmissive part 73 A and entering the first light incident surface 32 a of the wavelength conversion layer 32 and suppresses reflection of an excitation light B 72 or an excitation light B 73 transmitted through the second light-transmissive part 73 B and entering the second light incident surfaces 32 c of the wavelength conversion layer 32 .
- Transmission efficiency of the excitation light B is improved by deposition of the second anti-reflection film 34 D on the first light incident surface 32 a and the second light incident surfaces 32 c of the wavelength conversion layer 32 .
- the second anti-reflection film 34 D may be formed on the inner circumferential surface of the first concave portion 73 h 1 .
- the support member 31 is joined to the light-transmissive member 73 via the joining member 76 .
- the joining member 76 is placed between the first anti-reflection film 34 C provided on the planar surface 73 f of the first light-transmissive part 73 A and the first surface 31 a of the support member 31 and joins the surfaces in a good condition.
- the support member 31 is located on a side of the second light-transmissive part 73 B opposite to the wavelength conversion layer 32 in a direction crossing the optical axis of the excitation light B or the traveling direction of the excitation light B.
- the focal point Q of the first collecting system 46 is formed on the light exiting surface 32 b of the wavelength conversion layer 32 on the optical axis of the excitation light B.
- the second light-transmissive part 73 B opposed to the second light incident surfaces 32 c of the wavelength conversion layer 32 is provided, and the second light-transmissive part 73 B is integrally formed with the first light-transmissive part 73 A having a semi-spherical shape.
- a center luminous flux (excitation light B 71 ) is transmitted through the first light-transmissive part 73 A and enters the wavelength conversion layer 32 from the first light incident surface 32 a
- peripheral luminous fluxes (excitation light B 72 and excitation light B 73 ) not entering the first light incident surface 32 a are transmitted through the second light-transmissive part 73 B and enter the wavelength conversion layer 32 from the second light incident surfaces 32 c.
- the focal point Q of the first collecting system 46 is set on the light exiting surface 32 b of the wavelength conversion layer 32 and a light intensity distribution in a top-hat shape is formed on the light exiting surface 32 b , and thereby, optical density of the excitation light B entering only the first light incident surface 32 a may be dispersed on the second light incident surfaces 32 c . Therefore, the optical density of the excitation light B on the first light incident surface 32 a of the wavelength conversion layer 32 becomes lower, and thereby, occurrence of a light saturation phenomenon may be suppressed and wavelength conversion efficiency in the wavelength conversion layer 32 may be improved.
- the light-transmissive member 73 having an integrated structure of the first light-transmissive part 73 A and the second light-transmissive part 73 B is provided, and thereby, work of alignment of the members with each other and assembly of the light-transmissive member is unnecessary.
- FIG. 6 shows the configuration of the wavelength conversion element of modified example 1.
- FIG. 6 is a sectional view cut along a plane along the traveling direction of the excitation light B.
- a wavelength conversion element 80 shown in FIG. 6 has a light-transmissive member 83 including a convex lens having a semi-spherical shape in a sectional view, the wavelength conversion layer 32 placed within a concave portion 83 h of the light-transmissive member 83 and having the first light incident surface 32 a and the light exiting surface 32 b opposed to the first light incident surface 32 a , and the dichroic film 34 A provided on the first light incident surface 32 a and the second light incident surfaces 32 c of the wavelength conversion layer 32 .
- the light-transmissive member 83 has a planar surface 83 f crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, a convex surface 83 d projecting in the opposite direction to the traveling direction of the excitation light B, and the concave portion 83 h opening in the planar surface 83 f , and the wavelength conversion layer 32 and the dichroic film 34 A are provided within the concave portion 83 h .
- the first light incident surface 32 a is opposed to a bottom surface 83 b of the concave portion 83 h of the light-transmissive member 83 via the dichroic film 34 A, and the second light incident surfaces 32 c are opposed to an inner circumferential surface 83 c of the concave portion 83 h .
- the second anti-reflection film 34 D is formed on the surface of the dichroic film 34 A or the inner circumferential surface 83 c of the concave portion 83 h . Further, the second anti-reflection film 34 D is formed on the surface of the dichroic film 34 A or the bottom surface 83 b of the concave portion 83 h.
- the wavelength conversion layer 32 is buried into the concave portion 83 h of the light-transmissive member 83 , and therefore, the second light-transmissive member 33 B ( FIG. 3 ) used in the first embodiment is unnecessary. Further, the excitation light B entering from the convex surface 83 d of the light-transmissive member 83 enters the wavelength conversion layer 32 from one of the first light incident surface 32 a and the second light incident surfaces 32 c of the wavelength conversion layer 32 , and accordingly, the optical density of the excitation light B in the first light incident surface 32 a may be reduced. Furthermore, the heat generated in the wavelength conversion layer 32 may be effectively dissipated in the light-transmissive member 83 formed using sapphire having higher heat conductivity, and thereby, decrease of conversion efficiency in the wavelength conversion layer 32 may be suppressed.
- the planar surface 83 f and the support member may be fastened so that the support member may not be opposed to the light exiting surface 32 b .
- a concave portion is formed over the peripheral edge of the second light incident surfaces 32 c , a support member is provided in contact with the concave portion, and thereby, the light-transmissive member 83 may be fixed to the support member.
- FIG. 7 shows the configuration of the wavelength conversion element of modified example 2.
- FIG. 7 is a sectional view cut along the plane along the traveling direction of the excitation light B.
- the light exiting surface 32 b of the wavelength conversion layer 32 does not necessarily coincide with the planar surface 83 f of the light-transmissive member 83 .
- the dichroic film 34 A has the property of transmitting the excitation light B and reflecting the yellow fluorescent light Y generated in the wavelength conversion layer 32 , and accordingly, the light toward the inner circumferential surface 83 c of the concave portion 83 h of the lights output from the light exiting surface 32 b is reflected on the dichroic film 34 A on the inner circumferential surface 83 c and output to outside of the light-transmissive member 83 .
- the second anti-reflection film 34 D is formed on the surface of the dichroic film 34 A or the inner circumferential surface 83 c of the concave portion 83 h . Further, the second anti-reflection film 34 D is formed on the surface of the dichroic film 34 A or the bottom surface 83 b of the concave portion 83 h.
- the excitation light B enters the first light incident surface 32 a and the second light incident surfaces 32 c of the wavelength conversion layer 32 , and accordingly, the optical density in the first light incident surface 32 a may be reduced.
- the planar surface 83 f and the support member may be fastened so that the support member may not be opposed to the light exiting surface 32 b .
- a concave portion is formed over the peripheral edge of the second light incident surfaces 32 c , a support member is provided in contact with the concave portion, and thereby, the light-transmissive member 83 may be fixed to the support member.
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Abstract
The light source device of the invention includes an excitation light source that outputs an excitation light, a collecting system that collects the excitation light source, a first light-transmissive member that transmits the excitation light output from the collecting system, and a wavelength conversion layer having a first light incident surface crossing a traveling direction of the excitation light, a light exiting surface opposed to the first light incident surface, and a second light incident surface coupling an end portion of the first light incident surface and an end portion of the light exiting surface, wherein a focal point of the collecting system is formed inside of the wavelength conversion layer, and the wavelength conversion layer wavelength-converts the excitation light entering from the first light incident surface and the second light incident surface and generates a fluorescent light.
Description
- This invention relates to a light source device and a projector.
- In related art, in a light source device with a laser diode as an excitation light source that converts wavelengths using a fluorescent material, for example, as described in JP-A-2012-169049, a configuration that enables downsizing of the device by providing a cooling mechanism on a substrate with the fluorescent material thereon, but not providing a complex device such as a rotation mechanism is known.
- However, it is generally known that, when optical density (optical density per unit area) of excitation light in a light incident surface of a wavelength conversion layer increases, wavelength conversion efficiency (light emission efficiency) decreases. That is, a phenomenon (light saturation phenomenon) that, even when many lights enter the wavelength conversion layer, not all of the lights can be wavelength-converted occurs. Even if a heat dissipation member is provided around the wavelength conversion layer to suppress a temperature rise of the wavelength conversion layer, the wavelength conversion efficiency may decrease unless the optical density of the excitation light in the light incident surface of the wavelength conversion layer is reduced.
- The invention has been achieved in view of the above described problem of related art, and one of purposes is to provide a light source device that may suppress decrease of wavelength conversion efficiency by reducing optical density of excitation light in a light incident surface of a wavelength conversion layer. One of purposes of an aspect of the invention is to provide a projector including the light source device.
- A light source device in one aspect of the invention includes an excitation light source that outputs an excitation light, a collecting system that collects the excitation light, a light-transmissive member that transmits the excitation light output from the collecting system, and a wavelength conversion layer having a first light incident surface crossing a traveling direction of the excitation light, a light exiting surface opposed to the first light incident surface, and a second light incident surface coupling an end portion of the first light incident surface and an end portion of the light exiting surface, wherein a focal point of the collecting system is formed inside of the wavelength conversion layer, and the wavelength conversion layer wavelength-converts the excitation light entering from the first light incident surface and the second light incident surface and generates a fluorescent light.
- According to the configuration, the focal point of the collecting system is formed inside of the wavelength conversion layer, and accordingly, the excitation light transmitted through the light-transmissive member from the collecting system enters from both the first light incident surface and the second light incident surface of the wavelength conversion layer and optical density may be made lower compared to the case where the light incident surface is only the first light incident surface. Thereby, occurrence of the above described light saturation phenomenon may be suppressed and decrease of wavelength conversion efficiency in the wavelength conversion layer may be suppressed.
- In the light source device in the one aspect of the invention, the focal point of the collecting system may be formed inside of the wavelength conversion layer except the first light incident surface of the wavelength conversion layer, but including the light exiting surface on an optical axis of the excitation light.
- According to the configuration, for example, the focal point of the collecting system may be formed on the light exiting surface. Thereby, the excitation light enters from respective different positions on the first light incident surface and the second light incident surface, and incident locations of the excitation light into the wavelength conversion layer may be distributed.
- Therefore, the optical density on the first light incident surface and the second light incident surface may be reduced. Thereby, occurrence of the light saturation phenomenon may be suppressed and decrease of wavelength conversion efficiency in the wavelength conversion layer may be suppressed.
- In the light source device in the one aspect of the invention, a support member that supports the wavelength conversion layer and the light-transmissive member may be further provided at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light.
- According to the configuration, heat generated in the wavelength conversion layer may be dissipated via the support member, and thereby, non-uniformity of a temperature of the wavelength conversion layer in the same amount of excitation light may be suppressed and fluctuations of the conversion efficiency of the wavelength conversion layer may be suppressed.
- In the light source device in the one aspect of the invention, the light-transmissive member may have a first light-transmissive member having a planar surface crossing the traveling direction of the excitation light and a curved surface projecting in an opposite direction to the traveling direction of the excitation light, and placed with the planar surface opposed to the first light incident surface, and a second light-transmissive member placed on a side of the planar surface of the first light-transmissive member and having a hole penetrating in a direction along the optical axis, in a state in which the wavelength conversion layer is placed within the hole, the second light incident surface of the wavelength conversion layer may be opposed to an inner circumferential surface of the hole.
- According to the configuration, the first light-transmissive member and the second light-transmissive member are provided, and thereby, the second light-transmissive member may be easily placed around the wavelength conversion layer.
- In the light source device in the one aspect of the invention, a support member that supports the wavelength conversion layer and the light-transmissive member may be further provided at a side of the second light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light, and the first light-transmissive member may be joined to the support member via a joining member.
- According to the configuration, the joining member does not necessarily have light transmissivity, and accordingly, the joining member having higher heat conductivity may be used, the heat generated in the wavelength conversion layer may be efficiently transferred to the respective support member and light-transmissive member, and fluctuations of the conversion efficiency of the wavelength conversion layer may be suppressed.
- In the light source device in the one aspect of the invention, the light-transmissive member may have a planar surface crossing the traveling direction of the excitation light, a concave portion opening in the planar surface, and a curved surface projecting in an opposite direction to the traveling direction of the excitation light, and, in a state in which the wavelength conversion layer is placed within the concave portion, the first light incident surface may be opposed to a bottom surface of the concave portion and the second light incident surface may be opposed to an inner circumferential surface of the concave portion.
- According to the configuration, the wavelength conversion layer is placed within the concave portion formed in the light-transmissive member, and thereby, the light-transmissive member may be handled as a single member.
- In the light source device in the one aspect of the invention, a support member that supports the wavelength conversion layer and the light-transmissive member may be further provided at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light, and the light-transmissive member may have a second concave portion for placement of the support member.
- According to the configuration, placement of the support member with respect to the light-transmissive member is easier. Further, according to the configuration, a contact area between the light-transmissive member and the support member is increased by the second concave portion, and thereby, a heat dissipation property of the wavelength conversion layer via the light-transmissive member may be improved and a temperature rise of the wavelength conversion layer may be suppressed.
- In the light source device in the one aspect of the invention, the light-transmissive member may be formed using sapphire.
- According to the configuration, the light-transmissive member is formed using the sapphire having higher heat conductivity, and thereby, the heat dissipation property in the light-transmissive member may be improved.
- In the light source device in the one aspect of the invention, a dielectric multilayer film that transmits the excitation light and reflects the fluorescent light may be provided between the first light incident surface of the wavelength conversion layer and the light-transmissive member and the second light incident surface of the wavelength conversion layer and the light-transmissive member.
- According to the configuration, output of the excitation light (fluorescent light) converted by the wavelength conversion layer toward the light-transmissive member may be suppressed, the fluorescent light may be reliably output from the light exiting surface, and the decrease of the wavelength conversion efficiency in the light source device may be suppressed.
- A projector of the invention includes the above described light source, a light modulation device that modulates a light output from the light source device according to image information and generates an image light, and a projection system that projects the image light.
- According to the configuration, the projector including the light source device having excellent wavelength conversion efficiency may be obtained, and the projector with higher reliability may be provided.
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FIG. 1 is a schematic configuration diagram showing a projector of a first embodiment. -
FIG. 2 shows a schematic configuration of a light source device in the first embodiment. -
FIG. 3 is a sectional view of a wavelength conversion element in the first embodiment cut along a plane containing an illumination light axis inFIG. 2 . -
FIG. 4 shows a configuration of a light source device in a second embodiment. -
FIG. 5 is a sectional view of a wavelength conversion element in the second embodiment cut along a plane containing an illumination light axis inFIG. 4 . -
FIG. 6 shows a configuration of a wavelength conversion element of modified example 1. -
FIG. 7 shows a configuration of a wavelength conversion element of modified example 2. - As below, embodiments of the invention will be explained with reference to the drawings.
- Note that, in the respective drawings used in the following explanation, to clearly show characteristics, characteristic parts may be enlarged and shown for convenience and the dimension ratios of the respective component elements or the like are not necessarily the same as real ones.
- A projector of the embodiment is an example of a projector using three transmissive liquid crystal light valves as light modulation devices. Note that, as the light modulation devices, reflective liquid crystal light valves may be used. Alternatively, as the light modulation devices, other light modulation devices including devices using micromirrors e.g. DMDs (Digital Micromirror Devices) or the like than the liquid crystal devices may be used.
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FIG. 1 is the schematic configuration diagram showing the projector of the first embodiment. - As shown in
FIG. 1 , aprojector 1 includes alight source device 2A, acolor separation system 3, alight modulation device 4R, alight modulation device 4G, alight modulation device 4B, a color combiningsystem 5, and aprojection system 6. Thelight source device 2A outputs an illumination light WL. Thecolor separation system 3 separates the illumination light WL from thelight source device 2A into a red light LR, a green light LG, and a blue light LB. Thelight modulation device 4R, thelight modulation device 4G, and thelight modulation device 4B modulate the red light LR, the green light LG, and the blue light LB according to image information, respectively, and form image lights of the respective colors. The color combiningsystem 5 combines the image lights of the respective colors from the respectivelight modulation devices projection system 6 projects the combined image light from the color combiningsystem 5 toward a screen SCR. - As shown in
FIG. 2 , thelight source device 2A outputs the white illumination light (white light) WL formed by combination of part of a blue excitation light B output without being wavelength-converted of the blue excitation lights output from a semiconductor laser and a yellow fluorescent light Y generated by wavelength conversion of the excitation light B by awavelength conversion element 30. Thelight source device 2A outputs the illumination light WL adjusted to have a substantially uniform illuminance distribution toward thecolor separation system 3. The specific configuration of thelight source device 2A will be described later. - As shown in
FIG. 1 , thecolor separation system 3 includes a firstdichroic mirror 7 a, a seconddichroic mirror 7 b, afirst reflection mirror 8 a, asecond reflection mirror 8 b, a third reflection mirror 8 c, afirst relay lens 9 a, and asecond relay lens 9 b. - The first
dichroic mirror 7 a separates the illumination light WL output from thelight source device 2A into the red light LR and a light of a mixture of the green light LG and the blue light LB. For the purpose, the firstdichroic mirror 7 a has a property of transmitting the red light LR and reflecting the green light LG and the blue light LB. The seconddichroic mirror 7 b separates the light of the mixture of the green light LG and the blue light LB into the green light LG and the blue light LB. For the purpose, the seconddichroic mirror 7 b has a property of reflecting the green light LG and transmitting the blue light LB. - The
first reflection mirror 8 a is placed in an optical path of the red light LR and reflects the red light LR transmitted through the firstdichroic mirror 7 a toward thelight modulation device 4R. Thesecond reflection mirror 8 b and the third reflection mirror 8 c are placed in an optical path of the blue light LB and guides the blue light LB transmitted through the seconddichroic mirror 7 b to thelight modulation device 4B. - The
first relay lens 9 a and thesecond relay lens 9 b are placed at the downstream of the seconddichroic mirror 7 b in the optical path of the blue light LB. Thefirst relay lens 9 a and thesecond relay lens 9 b compensate for light loss of the blue light LB due to the optical path length of the blue light LB longer than the optical path lengths of the red light LR and the green light LG. - The respective
light modulation device 4R,light modulation device 4G, andlight modulation device 4B include liquid crystal panels. The respectivelight modulation device 4R,light modulation device 4G, andlight modulation device 4B modulate the respective red light LR, green light LG, and blue light LB according to image information while passing the respective red light LR, green light LG, and blue light LB, and form image lights corresponding to the respective colors. Polarizers (not shown) are respectively provided on light-incident sides and light-exiting sides of the respectivelight modulation device 4R,light modulation device 4G, andlight modulation device 4B. - A
field lens 10R, a field lens 10G, and afield lens 10B that parallelize the respective red light LR, green light LG, and blue light LB entering the respectivelight modulation device 4R,light modulation device 4G, andlight modulation device 4B are provided on the light-incident sides of the respectivelight modulation device 4R,light modulation device 4G, andlight modulation device 4B. - The
color combining system 5 includes a cross dichroic prism. Thecolor combining system 5 combines the image lights of the respective colors from the respectivelight modulation device 4R,light modulation device 4G, andlight modulation device 4B, and outputs the combined image light toward theprojection system 6. - The
projection system 6 includes a group of projection lenses. Theprojection system 6 enlarges and projects the image light combined by thecolor combining system 5 toward the screen SCR. Thereby, an enlarged color picture (image) is displayed on the screen SCR. - Next, the configuration of the
light source device 2A in the first embodiment will be explained. -
FIG. 2 shows the schematic configuration of the light source device in the first embodiment. - As shown in
FIG. 2 , thelight source device 2A includes anexcitation light source 110, an afocal system 11, ahomogenizer system 12, a collectingsystem 20, thewavelength conversion element 30, apickup system 60, afirst lens array 120, asecond lens array 130, apolarization conversion element 140, and a superimposinglens 150. - The
excitation light source 110 includes a plurality ofsemiconductor lasers 110A that output the blue excitation lights B of laser beams. A peak of light emission intensity of the excitation light B is e.g. 445 nm. The plurality ofsemiconductor lasers 110A are arranged in an array form within one plane orthogonal to an illumination light axis 100 ax. Note that, as theexcitation light source 110, semiconductor lasers that output blue lights having other wavelengths e.g. 455 nm or 460 nm than 445 nm may be used. Alternatively, as theexcitation light source 110, not limited to the semiconductor laser diodes, but LEDs (Light Emitting Diodes) may be used. - The afocal system 11 includes e.g. a
convex lens 11 a and aconcave lens 11 b. The afocal system 11 reduces the diameter of a luminous flux of a plurality of laser beams output from theexcitation light source 110. Note that a collimator system may be placed between the afocal system 11 and theexcitation light source 110 to convert the excitation light entering the afocal system 11 into a parallel luminous flux. - The
homogenizer system 12 includes e.g. a firstmulti-lens array 12 a and a secondmulti-lens array 12 b. Thehomogenizer system 12 sets the light intensity distribution of the excitation light to a homogeneous state on a wavelength conversion layer, which will be described later, the so-called top-hat distribution. The homogenizer system. 12 superimposes a plurality of small luminous fluxes output from the plurality of lenses of the firstmulti-lens array 12 a and the secondmulti-lens array 12 b on each other on the wavelength conversion layer with the collectingsystem 20. Thereby, the light intensity distribution of the excitation light B radiated onto the wavelength conversion layer is homogenized. - The collecting
system 20 includes e.g. afirst lens 20 a and asecond lens 20 b. The collectingsystem 20 is provided in an optical path from thehomogenizer system 12 to thewavelength conversion element 30, collects and enters the excitation light B into the wavelength conversion layer of thewavelength conversion element 30. In the embodiment, thefirst lens 20 a and thesecond lens 20 b are respectively formed using convex lenses. - The
pickup system 60 includes e.g. afirst collimating lens 62 and asecond collimating lens 64. The pickup system substantially parallelizes the light output from thewavelength conversion element 30. Thefirst collimating lens 62 and thesecond collimating lens 64 are respectively formed using convex lenses. - The
first lens array 120 has a plurality offirst lenses 122 for dividing the light output from thepickup system 60 into a plurality of partial luminous fluxes. The plurality offirst lenses 122 are arranged in a matrix form within a plane orthogonal to the illumination light axis 100 ax. - The
second lens array 130 has a plurality ofsecond lenses 132 corresponding to the plurality offirst lenses 122 of thefirst lens array 120. Thesecond lens array 130 forms images of the respectivefirst lenses 122 of thefirst lens array 120 near image formation areas of thelight modulation device 4R, thelight modulation device 4G, and thelight modulation device 4B with the superimposinglens 150. The plurality ofsecond lenses 132 are arranged in a matrix form within a plane orthogonal to the illumination light axis 100 ax. - The
polarization conversion element 140 converts the lights output from thesecond lens array 130 into linearly-polarized lights. Thepolarization conversion element 140 includes e.g. a polarization separation film and a wave plate (both not shown). - The superimposing
lens 150 collects and superimposes the respective partial luminous fluxes output from thepolarization conversion element 140 near the image formation areas of thelight modulation device 4R, thelight modulation device 4G, and thelight modulation device 4B. - Next, a configuration of the wavelength conversion element in the first embodiment will be explained.
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FIG. 3 is the sectional view of thewavelength conversion element 30 in the first embodiment cut along the plane containing the illumination light axis 100 ax inFIG. 2 . - As shown in
FIG. 3 , thewavelength conversion element 30 includes asupport member 31, a light-transmissive member 33, awavelength conversion layer 32, adichroic film 34A, and a firstanti-reflection film 34C. - The
support member 31 is formed using a rectangular plate material and has afirst surface 31 a and asecond surface 31 b facing each other in a direction of a plate thickness. Thesupport member 31 is placed with thefirst surface 31 a toward the collecting system. 20 and thesecond surface 31 b toward thepickup system 60. In thesupport member 31, ahole 31 h penetrating in the thickness direction between thefirst surface 31 a and thesecond surface 31 b is provided. The shape of thehole 31 h is rectangular as seen from a normal direction of thefirst surface 31 a. - The
support member 31 may be formed using a material with light transmissivity such as glass or quartz, or may be formed using a material without light transmissivity such as metal. In the case of the metal material, a metal with a good heat dissipation property such as aluminum or copper is desirably used. - The
wavelength conversion layer 32 is provided and supported inside of a throughhole 33 h of a second light-transmissive member 33B. The shape of thewavelength conversion layer 32 is rectangular as seen from a normal direction of alight exiting surface 32 b of thewavelength conversion layer 32. Thewavelength conversion layer 32 has a firstlight incident surface 32 a crossing an optical axis of the excitation light B or a traveling direction of the excitation light B output from theexcitation light source 110, thelight exiting surface 32 b opposed to the firstlight incident surface 32 a, and second light incident surfaces 32 c coupling the firstlight incident surface 32 a and thelight exiting surface 32 b. The firstlight incident surface 32 a is opposed to aplanar surface 33 f of a first light-transmissive member 33A, which will be described later. In the embodiment, the second light incident surfaces 32 c are used as light incident surfaces separately from the firstlight incident surface 32 a, and the area into which the excitation light B is entered is larger compared to a configuration using only the firstlight incident surface 32 a as the light incident surface. Thelight exiting surface 32 b is formed on the same plane as thesecond surface 31 b of thesupport member 31. - Note that the shape of the
wavelength conversion layer 32 is not limited to the rectangular shape as shown in the drawing, but the second light incident surfaces 32 c may be surfaces having different orientations relative to the optical axis from the firstlight incident surface 32 a and inclined at a predetermined angle toward the traveling direction of the excitation light relative to the firstlight incident surface 32 a. - In the
wavelength conversion layer 32, the blue excitation light B output from theexcitation light source 110 is entered from the firstlight incident surface 32 a and the second light incident surfaces 32 c, and the yellow fluorescent light Y after wavelength conversion is output from thelight exiting surface 32 b. Thewavelength conversion layer 32 contains fluorescent material particles (not shown) that convert and output the blue excitation light B into the yellow fluorescent light Y. - As the fluorescent material particles, e.g. a YAG (yttrium aluminum garnet) fluorescent material is used. Note that, as a material forming the fluorescent material particles, a single kind of material may be used or mixture of particles formed using two or more kinds of materials may be used. It is preferable to use a material having good heat resistance and surface workability for the
wavelength conversion layer 32. As thewavelength conversion layer 32, a fluorescent material layer in which fluorescent material particles are dispersed in an inorganic binder such as alumina, a fluorescent material layer in which fluorescent material particles are sintered without using a binder, or the like is preferably used. - The
dichroic film 34A is provided on the firstlight incident surface 32 a and the four second light incident surfaces 32 c of thewavelength conversion layer 32. Thedichroic film 34A has a property of transmitting the blue excitation light B output from theexcitation light source 110 and reflecting the yellow fluorescent light Y generated in thewavelength conversion layer 32. - The light-
transmissive member 33 includes the first light-transmissive member 33A having a semi-spherical shape, and the second light-transmissive member 33B having a square tube shape. - The first light-
transmissive member 33A includes a plano-convex lens having a semi-spherical shape in a sectional view, and has theplanar surface 33 f and aconvex surface 33 d. The first light-transmissive member 33A is provided with theplanar surface 33 f opposed to the firstlight incident surface 32 a of thewavelength conversion layer 32 and fixed to thefirst surface 31 a side of thesupport member 31. Theconvex surface 33 d of the first light-transmissive member 33A is a curved surface projecting in an opposite direction to the traveling direction of the excitation light B. The center of the radius of curvature of theconvex surface 33 d is formed on thelight exiting surface 32 b of thewavelength conversion layer 32. - The second light-
transmissive member 33B has the square tube shape along the outer shape of thewavelength conversion layer 32, and has the throughhole 33 h penetrating in the thickness direction of thewavelength conversion layer 32 along the optical axis. The dimension of the second light-transmissive member 33B in a direction crossing the optical axis (traveling direction of light) is appropriately set. An inner circumferential surface 33 i of the throughhole 33 h is opposed to the four second light incident surfaces 32 c forming the outer circumferential surface of thewavelength conversion layer 32. In the direction crossing the optical axis, thesupport member 31 is provided on a side of the second light-transmissive member 33B opposite to thewavelength conversion layer 32. The second light-transmissive member 33B has aplanar surface 33 c crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, and theplanar surface 33 c is formed on the same plane as thesecond surface 31 b of thesupport member 31. - These first light-
transmissive member 33A and second light-transmissive member 33B are placed with the center axes aligned with each other on the optical axis of the excitation light B. The light-transmissive member 33, i.e., both the first light-transmissive member 33A and second light-transmissive member 33B of the embodiment are formed using sapphire having higher heat conductivity. - The first
anti-reflection film 34C is provided on theplanar surface 33 f of the first light-transmissive member 33A. The firstanti-reflection film 34C has a property of suppressing reflection of the excitation light B, and transmission efficiency of the excitation light B is improved by deposition of the film on theplanar surface 33 f of the first light-transmissive member 33A. Note that an anti-reflection film may be provided on thelight exiting surface 32 b of thewavelength conversion layer 32. - A
second anti-reflection film 34D is provided to cover the inner circumferential surface of the second light-transmissive member 33B. Thesecond anti-reflection film 34D suppresses reflection of the excitation light B transmitted through the second light-transmissive member 33B and entering the second light incident surfaces 32 c of thewavelength conversion layer 32. The transmission efficiency of the excitation light B is improved by deposition of thesecond anti-reflection film 34D to be opposed to the second light incident surfaces 32 c of thewavelength conversion layer 32. Thereby, in the case where the wavelength conversion layer is fitted in the throughhole 33 h of the second light-transmissive member 33B, even when an air layer intervenes between thedichroic film 34A and thesecond anti-reflection film 34D, the anti-reflection effect for the excitation light B transmitted through the second light-transmissive member 33B may be maintained. - A joining
member 36 is provided between the firstanti-reflection film 34C provided on the first light-transmissive member 33A and thefirst surface 31 a of thesupport member 31 and joins the first light-transmissive member 33A to thesupport member 31. As the joiningmember 36, a member having higher thermal conductivity is preferable. For example, the member includes e.g. solder and a thermally conductive sheet. The material having higher thermal conductivity is used, and thereby, heat generated in thewavelength conversion layer 32 may be efficiently transferred from thesupport member 31 to the first light-transmissive member 33A and the heat dissipation property of thewavelength conversion layer 32 may be improved. - The joining
member 36 provided between the second light-transmissive member 33B and theplanar surface 33 f (firstanti-reflection film 34C) of the first light-transmissive member 33A should have light transmissivity. - Whether or not the joining
member 36 provided between the support member 31 (first surface 31 a) and theplanar surface 33 f (firstanti-reflection film 34C) of the first light-transmissive member 33A has light transmissivity does not matter. - In the
wavelength conversion element 30 of the embodiment, a focal point of the collectingsystem 20 is formed not on the firstlight incident surface 32 a of thewavelength conversion layer 32, but inside of thewavelength conversion layer 32 including thelight exiting surface 32 b closer to the side in the traveling direction of light than the firstlight incident surface 32 a. That is, the focal point of the collectingsystem 20 may be located in a position inside of thewavelength conversion layer 32 except the firstlight incident surface 32 a and further on the optical axis of the excitation light B. - In the embodiment, a focal point Q of the collecting
system 20 is formed at the center of thelight exiting surface 32 b of thewavelength conversion element 30. Accordingly, the excitation light B output from the collectingsystem 20 is transmitted through the first light-transmissive member 33A and output from theplanar surface 33 f toward thewavelength conversion layer 32 and the second light-transmissive member 33B. Of the excitation light B output from theplanar surface 33 f of the first light-transmissive member 33A, a center luminous flux (excitation light B31) enters thewavelength conversion layer 32 from the firstlight incident surface 32 a, and peripheral luminous fluxes (excitation light B32 and excitation light B33) not entering the firstlight incident surface 32 a are transmitted through the second light-transmissive member 33B and enter thewavelength conversion layer 32 from the second light incident surfaces 32 c. - As described above, according to the configuration of the embodiment, the focal point Q of the collecting
system 20 is set on thelight exiting surface 32 b of thewavelength conversion layer 32 and a light intensity distribution in a top-hat shape is formed on thelight exiting surface 32 b, and thereby, optical density of the excitation light B concentrated on the firstlight incident surface 32 a of thewavelength conversion layer 32 in related art may be dispersed on the second light incident surfaces 32 c. - That is, in the embodiment, in addition to the first light-
transmissive member 33A, the second light-transmissive member 33B is provided around the optical axis of thewavelength conversion layer 32, and thereby, the side surfaces of thewavelength conversion layer 32 may be used as the second light incident surfaces 32 c and the excitation light B may be respectively entered from the firstlight incident surface 32 a and the second light incident surfaces 32 c. The focal point Q of the collectingsystem 20 is formed on thelight exiting surface 32 b, and thereby, the respective beams (B31 to B33) of the excitation light B may respectively enter from on the firstlight incident surface 32 a and the second light incident surfaces 32 c. - As described above, the focal point of the collecting
system 20 is formed inside of thewavelength conversion layer 32 on the optical axis of the excitation light B. That is, the focal point of the collectingsystem 20 is formed inside of thewavelength conversion layer 32 except the firstlight incident surface 32 a, but including thelight exiting surface 32 b, and thereby, the optical density of the excitation light B on the firstlight incident surface 32 a of thewavelength conversion layer 32 becomes lower. Accordingly, occurrence of a light saturation phenomenon may be suppressed and substantially all of the excitation light B entering thewavelength conversion layer 32 may be efficiently converted. Therefore, decrease and fluctuations of wavelength conversion efficiency of thewavelength conversion element 30 may be suppressed and wavelength conversion efficiency of the wavelength conversion element 30 (wavelength conversion layer 32) may be improved without reduction of the amount of excitation light B entering thewavelength conversion layer 32. - Note that, in the case where only the first
light incident surface 32 a is used as the light incident surface, the light saturation phenomenon may be suppressed by increase of the area of the firstlight incident surface 32 a, however, if the area of the firstlight incident surface 32 a is increased, the size of the light-transmissive member 33 (particularly, the first light-transmissive member 33A) proportionally increases and thewavelength conversion element 30 is upsized. Therefore, the side surfaces (second light incident surfaces 32 c) of thewavelength conversion layer 32 are effectively used as the light incident surfaces. - Further, the second light-
transmissive member 33B is formed using sapphire having higher heat conductivity. Accordingly, the heat generated in thewavelength conversion layer 32 may be not only dissipated from the first light-transmissive member 33A but also transferred to thesupport member 31 provided on the side of the second light-transmissive member 33B opposite to thewavelength conversion layer 32 via the second light-transmissive member 33B and dissipated in thesupport member 31. As described above, the heat generated in thewavelength conversion layer 32 may be efficiently dissipated in the first light-transmissive member 33A and thesupport member 31 via the second light-transmissive member 33B, and thereby, non-uniformity of the temperature of thewavelength conversion layer 32 in the same amount of excitation light may be suppressed and decrease and fluctuations of the conversion efficiency of thewavelength conversion element 30 may be further suppressed. - Note that, in the embodiment, the focal point Q of the collecting
system 20 is formed on thelight exiting surface 32 b of thewavelength conversion layer 32 and the top-hat distribution is formed on thelight exiting surface 32 b, however, the configuration is not limited to that. - For example, the focal point may be formed in any position inside of the
wavelength conversion layer 32 on the optical axis of the collectingsystem 20 except the firstlight incident surface 32 a of thewavelength conversion layer 32. - Note that the
light exiting surface 32 b of thewavelength conversion layer 32 does not necessarily coincide with theplanar surface 33 c or thesecond surface 31 b. Specifically, thelight exiting surface 32 b may be provided closer to a side opposite to the traveling direction of the excitation light B than theplanar surface 33 c or thesecond surface 31 b. - Next, a light source device of the second embodiment of the invention will be explained.
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Alight source device 2B of the embodiment shown as below is different from the configuration of the above described first embodiment in that the blue-separationlight source device 2B is provided. Accordingly, in the following explanation, the configuration of thelight source device 2B will be specifically explained, and the explanation of the common parts will be omitted. Further, in the respective drawings used in the explanation, the component elements in common withFIGS. 1 to 3 have the same signs. -
FIG. 4 shows the configuration of thelight source device 2B in the second embodiment. - As shown in
FIG. 4 , thelight source device 2B generally includes theexcitation light source 110, acollimator system 42, awave plate 43, apolarization separation element 44, afirst homogenizer system 45, afirst collecting system 46, awavelength conversion element 70, afirst pickup lens 48, adichroic mirror 49, atotal reflection mirror 50, asecond wave plate 51, asecond homogenizer system 52, asecond collecting system 53, a reflectionrotatory diffusion element 54, and asecond pickup lens 55. - Of the
light source device 2B, theexcitation light source 110, thecollimator system 42, thewave plate 43, thepolarization separation element 44, thefirst homogenizer system 45, thefirst collecting system 46, thewavelength conversion element 70, thefirst pickup lens 48, and thedichroic mirror 49 are sequentially arranged on the illumination light axis 100 ax. - The
wave plate 43 includes a half wave plate having a rotation mechanism. Thewave plate 43 converts P-polarized lights and S-polarized lights of the excitation lights B collected by thecollimating system 42 at an arbitrary ratio. Note that thewave plate 43 may be a quarter wave plate, and is not particularly limited as long as the plate may change the polarization states (the ratio of P-polarized lights and S-polarized lights) by rotation and movement. - The
polarization separation element 44 is the so-called plate-type polarizing beam splitter (PBS) and has an inclined surface at an angle of 45° relative to the illumination light axis 100 ax. Thepolarization separation element 44 passes the P-polarized light component of the incident light and reflects the S-polarized light component. The P-polarized light component is transmitted through thepolarization separation element 44 and travels toward the first homogenizer system. 45. The S-polarized light component is reflected by thepolarization separation element 44 and travels toward thetotal reflection mirror 50. - The
first homogenizer system 45 includes e.g. a firstmulti-lens array 45 a and a secondmulti-lens array 45 b. Thefirst homogenizer system 45 sets the light intensity distribution of the excitation light B to a homogeneous state on the wavelength conversion layer, which will be described later, the so-called top-hat distribution. Thefirst homogenizer system 45 superimposes a plurality of small luminous fluxes output from the plurality of lenses of the firstmulti-lens array 45 a and the secondmulti-lens array 45 b on each other on the wavelength conversion layer to be described later with thefirst collecting system 46. Thereby, the light intensity distribution of the excitation light B radiated onto the wavelength conversion layer to be described later is homogenized. - The
first collecting system 46 is placed in an optical path from thefirst homogenizer system 45 to thewavelength conversion element 70, collects and enters the excitation light B into the wavelength conversion layer of thewavelength conversion element 70. In the embodiment, thefirst collecting system 46 is formed using a convex lens. - The
first pickup lens 48 includes e.g. a convex lens and substantially parallelizes the yellow light Y output from thewavelength conversion element 70. - The
dichroic mirror 49 is a mirror that passes the yellow light Y output from thewavelength conversion element 70 and reflects the blue light B entering from a direction orthogonal to the yellow light Y in the same traveling direction as that of the yellow light Y. - The
total reflection mirror 50 is placed in an optical path of the blue light B and totally reflects the blue light separated in thepolarization separation element 44 toward thesecond wave plate 51. - The
second wave plate 51 is a quarter wave plate (λ/4 plate). Thesecond wave plate 51 converts the S-polarized blue light B output from thepolarization separation element 44 into circularly-polarized light. - The
second homogenizer system 52 includes e.g. a firstmulti-lens array 52 a and a secondmulti-lens array 52 b. Thesecond homogenizer system 52 superimposes a plurality of small luminous fluxes output from a plurality of lenses of the firstmulti-lens array 52 a and the secondmulti-lens array 52 b on each other on the reflectionrotatory diffusion element 54 with thesecond collecting system 53. Thereby, the light intensity distribution of the blue light B radiated onto the reflectionrotatory diffusion element 54 is homogenized. - The
second collecting system 53 is placed in an optical path from thesecond homogenizer system 52 to the reflectionrotatory diffusion element 54, collects and enters the blue light B that has been converted into the circularly-polarized light into the reflectionrotatory diffusion element 54. In the embodiment, thesecond collecting system 53 is formed using a convex lens. - The reflection
rotatory diffusion element 54 diffusionally reflects the beam output from thesecond collecting system 53 toward thesecond pickup lens 55. As the reflectionrotatory diffusion element 54, it is preferable to use an element that diffusionally reflects the beam entering the reflectionrotatory diffusion element 54 with characteristics of Lambert's reflection or closer to Lambert's reflection. - The
second pickup lens 55 includes e.g. a convex lens and substantially parallelizes the blue light B output from the reflectionrotatory diffusion element 54. The parallelized blue light B travels to thedichroic mirror 49 and is reflected in thedichroic mirror 49 in the same direction as that of the yellow light Y traveling in the direction orthogonal to the blue light B. - As described above, the beam (blue light B) output from the reflection
rotatory diffusion element 54 is combined with the yellow fluorescent light Y transmitted through thedichroic mirror 49, and the white illumination light WL is obtained. The white illumination light WL enters thecolor separation system 3 shown inFIG. 1 . - Next, a configuration of the wavelength conversion element in the second embodiment will be explained.
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FIG. 5 is the sectional view showing the configuration of thewavelength conversion element 70 in the second embodiment. - As shown in
FIG. 5 , thewavelength conversion element 70 includes thesupport member 31, a light-transmissive member 73, thewavelength conversion layer 32, thedichroic film 34A, the firstanti-reflection film 34C, thesecond anti-reflection film 34D, and a joiningmember 76. - The light-
transmissive member 73 has a first light-transmissive part 73A and a second light-transmissive part 73B that transmit excitation light. - The second light-
transmissive part 73B has a square tube shape, and has aplanar surface 73 a crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, a first concave portion 73h 1 opening in a rectangular shape in theplanar surface 73 a, and a second concave portion 73 h 2 formed in a rectangular shape over a peripheral edge. Theplanar surface 73 a is formed on the same plane as thesecond surface 31 b of thesupport member 31. Further, thelight exiting surface 32 b is formed on the same plane as thesecond surface 31 b of thesupport member 31. Note that thelight exiting surface 32 b of thewavelength conversion layer 32 does not necessarily coincide with theplanar surface 73 a or thesecond surface 31 b. Specifically, thelight exiting surface 32 b may be provided closer to a side opposite to the traveling direction of the excitation light B than theplanar surface 73 a or thesecond surface 31 b. - The first light-
transmissive part 73A has aplanar surface 73 f forming a part of the second concave portion 73 h 2 and crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, and acurved surface 73 d projecting in the opposite direction to the traveling direction of the excitation light B. - The light-
transmissive member 73 has an integrated structure of the first light-transmissive part 73A and the second light-transmissive part 73B. - The
wavelength conversion layer 32 is placed within the first concave portion 73h 1 formed on the second light-transmissive part 73B side of the light-transmissive member 73. In thewavelength conversion layer 32, the firstlight incident surface 32 a is opposed to abottom surface 73 b of the first concave portion 73h 1 via thedichroic film 34A and thesecond anti-reflection film 34D, which will be described later, and the second light incident surfaces 32 c are opposed to an innercircumferential surface 73 c of the first concave portion 73h 1 via thedichroic film 34A and thesecond anti-reflection film 34D to be described later. Thedichroic film 34A is provided on the firstlight incident surface 32 a and the second light incident surfaces 32 c of thewavelength conversion layer 32, and further, thesecond anti-reflection film 34D is provided on thedichroic film 34A. - The
dichroic film 34A is provided on the firstlight incident surface 32 a and the second light incident surfaces 32 c of thewavelength conversion layer 32. Thedichroic film 34A has the property of transmitting the blue excitation light B output from theexcitation light source 110 and reflecting the yellow fluorescent light Y generated in thewavelength conversion layer 32. - The
second anti-reflection film 34D is provided to cover the outer surface of thedichroic film 34A provided on the firstlight incident surface 32 a and the second light incident surfaces 32 c of thewavelength conversion layer 32. Thesecond anti-reflection film 34D suppresses reflection of an excitation light B71 transmitted through the first light-transmissive part 73A and entering the firstlight incident surface 32 a of thewavelength conversion layer 32 and suppresses reflection of an excitation light B72 or an excitation light B73 transmitted through the second light-transmissive part 73B and entering the second light incident surfaces 32 c of thewavelength conversion layer 32. Transmission efficiency of the excitation light B is improved by deposition of thesecond anti-reflection film 34D on the firstlight incident surface 32 a and the second light incident surfaces 32 c of thewavelength conversion layer 32. Note that thesecond anti-reflection film 34D may be formed on the inner circumferential surface of the first concave portion 73h 1. - The
support member 31 is joined to the light-transmissive member 73 via the joiningmember 76. The joiningmember 76 is placed between the firstanti-reflection film 34C provided on theplanar surface 73 f of the first light-transmissive part 73A and thefirst surface 31 a of thesupport member 31 and joins the surfaces in a good condition. Thesupport member 31 is located on a side of the second light-transmissive part 73B opposite to thewavelength conversion layer 32 in a direction crossing the optical axis of the excitation light B or the traveling direction of the excitation light B. - Also, in the
wavelength conversion element 70 of the embodiment, the focal point Q of thefirst collecting system 46 is formed on thelight exiting surface 32 b of thewavelength conversion layer 32 on the optical axis of the excitation light B. Further, in the embodiment, the second light-transmissive part 73B opposed to the second light incident surfaces 32 c of thewavelength conversion layer 32 is provided, and the second light-transmissive part 73B is integrally formed with the first light-transmissive part 73A having a semi-spherical shape. - Accordingly, of the excitation light B output from the
first collecting system 46, a center luminous flux (excitation light B71) is transmitted through the first light-transmissive part 73A and enters thewavelength conversion layer 32 from the firstlight incident surface 32 a, and peripheral luminous fluxes (excitation light B72 and excitation light B73) not entering the firstlight incident surface 32 a are transmitted through the second light-transmissive part 73B and enter thewavelength conversion layer 32 from the second light incident surfaces 32 c. - As described above, as is the case with the above described first embodiment, the focal point Q of the
first collecting system 46 is set on thelight exiting surface 32 b of thewavelength conversion layer 32 and a light intensity distribution in a top-hat shape is formed on thelight exiting surface 32 b, and thereby, optical density of the excitation light B entering only the firstlight incident surface 32 a may be dispersed on the second light incident surfaces 32 c. Therefore, the optical density of the excitation light B on the firstlight incident surface 32 a of thewavelength conversion layer 32 becomes lower, and thereby, occurrence of a light saturation phenomenon may be suppressed and wavelength conversion efficiency in thewavelength conversion layer 32 may be improved. - According to the configuration of the embodiment, the light-
transmissive member 73 having an integrated structure of the first light-transmissive part 73A and the second light-transmissive part 73B is provided, and thereby, work of alignment of the members with each other and assembly of the light-transmissive member is unnecessary. - As above, the preferred embodiments according to the invention are explained with reference to the accompanying drawings, however, obviously, the invention is not limited to those examples. It is clear that a person skilled in the art could think of various modified examples or altered examples within the scope of the technical idea described in the appended claims and it is understood that the examples naturally belong to the technical scope of the invention.
- Next, configurations of modified examples of the wavelength conversion element will be explained.
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FIG. 6 shows the configuration of the wavelength conversion element of modified example 1.FIG. 6 is a sectional view cut along a plane along the traveling direction of the excitation light B. - A
wavelength conversion element 80 shown inFIG. 6 has a light-transmissive member 83 including a convex lens having a semi-spherical shape in a sectional view, thewavelength conversion layer 32 placed within aconcave portion 83 h of the light-transmissive member 83 and having the firstlight incident surface 32 a and thelight exiting surface 32 b opposed to the firstlight incident surface 32 a, and thedichroic film 34A provided on the firstlight incident surface 32 a and the second light incident surfaces 32 c of thewavelength conversion layer 32. The light-transmissive member 83 has aplanar surface 83 f crossing the optical axis of the excitation light B or the traveling direction of the excitation light B, aconvex surface 83 d projecting in the opposite direction to the traveling direction of the excitation light B, and theconcave portion 83 h opening in theplanar surface 83 f, and thewavelength conversion layer 32 and thedichroic film 34A are provided within theconcave portion 83 h. The firstlight incident surface 32 a is opposed to abottom surface 83 b of theconcave portion 83 h of the light-transmissive member 83 via thedichroic film 34A, and the second light incident surfaces 32 c are opposed to an innercircumferential surface 83 c of theconcave portion 83 h. Note that thesecond anti-reflection film 34D is formed on the surface of thedichroic film 34A or the innercircumferential surface 83 c of theconcave portion 83 h. Further, thesecond anti-reflection film 34D is formed on the surface of thedichroic film 34A or thebottom surface 83 b of theconcave portion 83 h. - According to the configuration of the embodiment, the
wavelength conversion layer 32 is buried into theconcave portion 83 h of the light-transmissive member 83, and therefore, the second light-transmissive member 33B (FIG. 3 ) used in the first embodiment is unnecessary. Further, the excitation light B entering from theconvex surface 83 d of the light-transmissive member 83 enters thewavelength conversion layer 32 from one of the firstlight incident surface 32 a and the second light incident surfaces 32 c of thewavelength conversion layer 32, and accordingly, the optical density of the excitation light B in the firstlight incident surface 32 a may be reduced. Furthermore, the heat generated in thewavelength conversion layer 32 may be effectively dissipated in the light-transmissive member 83 formed using sapphire having higher heat conductivity, and thereby, decrease of conversion efficiency in thewavelength conversion layer 32 may be suppressed. - Note that, in the case where the light-
transmissive member 83 is fixed to a support member, theplanar surface 83 f and the support member may be fastened so that the support member may not be opposed to thelight exiting surface 32 b. Alternatively, a concave portion is formed over the peripheral edge of the second light incident surfaces 32 c, a support member is provided in contact with the concave portion, and thereby, the light-transmissive member 83 may be fixed to the support member. -
FIG. 7 shows the configuration of the wavelength conversion element of modified example 2.FIG. 7 is a sectional view cut along the plane along the traveling direction of the excitation light B. - Like a
wavelength conversion element 85 shown inFIG. 7 , thelight exiting surface 32 b of thewavelength conversion layer 32 does not necessarily coincide with theplanar surface 83 f of the light-transmissive member 83. Thedichroic film 34A has the property of transmitting the excitation light B and reflecting the yellow fluorescent light Y generated in thewavelength conversion layer 32, and accordingly, the light toward the innercircumferential surface 83 c of theconcave portion 83 h of the lights output from thelight exiting surface 32 b is reflected on thedichroic film 34A on the innercircumferential surface 83 c and output to outside of the light-transmissive member 83. Note that thesecond anti-reflection film 34D is formed on the surface of thedichroic film 34A or the innercircumferential surface 83 c of theconcave portion 83 h. Further, thesecond anti-reflection film 34D is formed on the surface of thedichroic film 34A or thebottom surface 83 b of theconcave portion 83 h. - Also, in this configuration, the excitation light B enters the first
light incident surface 32 a and the second light incident surfaces 32 c of thewavelength conversion layer 32, and accordingly, the optical density in the firstlight incident surface 32 a may be reduced. - Note that, as is the case of modified example 1, in the case where the light-
transmissive member 83 is fixed to a support member, theplanar surface 83 f and the support member may be fastened so that the support member may not be opposed to thelight exiting surface 32 b. Alternatively, a concave portion is formed over the peripheral edge of the second light incident surfaces 32 c, a support member is provided in contact with the concave portion, and thereby, the light-transmissive member 83 may be fixed to the support member. - The entire disclosure of Japanese Patent Application No. 2016-231400, filed on Nov. 29, 2016 is expressly incorporated by reference herein.
Claims (14)
1-10. (canceled)
11. A light source device comprising:
an excitation light source that outputs an excitation light;
a collecting system that collects the excitation light;
a light-transmissive member that transmits the excitation light output from the collecting system; and
a wavelength conversion layer having a first light incident surface crossing a traveling direction of the excitation light, a light exiting surface opposed to the first light incident surface, and a second light incident surface coupling an end portion of the first light incident surface and an end portion of the light exiting surface, wherein
a focal point of the collecting system is formed inside of the wavelength conversion layer, and the wavelength conversion layer wavelength-converts the excitation light entering from the first light incident surface and the second light incident surface and generates a fluorescent light.
12. The light source device according to claim 11 , wherein
the focal point of the collecting system is formed inside of the wavelength conversion layer except the first light incident surface, and including the light exiting surface of the wavelength conversion layer on an optical axis of the excitation light.
13. The light source device according to claim 11 , further comprising a support member that supports the wavelength conversion layer and the light-transmissive member at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light.
14. The light source device according to claim 12 , further comprising a support member that supports the wavelength conversion layer and the light-transmissive member at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light.
15. The light source device according to claim 12 , wherein
the light-transmissive member includes:
a first light-transmissive member having a planar surface crossing the traveling direction of the excitation light and a curved surface projecting in an opposite direction to the traveling direction of the excitation light, and placed with the planar surface opposed to the first light incident surface; and
a second light-transmissive member placed at a side of the planar surface of the first light-transmissive member and having a hole penetrating in a direction along the optical axis, wherein
in a state in which the wavelength conversion layer is placed within the hole, the second light incident surface of the wavelength conversion layer is opposed to an inner circumferential surface of the hole.
16. The light source device according to claim 15 , further comprising a support member that supports the wavelength conversion layer and the light-transmissive member at a side of the second light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light, wherein
the first light-transmissive member is joined to the support member via a joining member.
17. The light source device according to claim 11 , wherein
the light-transmissive member has a planar surface crossing the traveling direction of the excitation light, a concave portion opening in the planar surface, and a curved surface projecting in an opposite direction to the traveling direction of the excitation light, and
in a state in which the wavelength conversion layer is placed within the concave portion, the first light incident surface is opposed to a bottom surface of the concave portion and the second light incident surface is opposed to an inner circumferential surface of the concave portion.
18. The light source device according to claim 12 , wherein
the light-transmissive member has a planar surface crossing the traveling direction of the excitation light, a concave portion opening in the planar surface, and a curved surface projecting in an opposite direction to the traveling direction of the excitation light, and
in a state in which the wavelength conversion layer is placed within the concave portion, the first light incident surface is opposed to a bottom surface of the concave portion and the second light incident surface is opposed to an inner circumferential surface of the concave portion.
19. The light source device according to claim 17 , further comprising a support member that supports the wavelength conversion layer and the light-transmissive member at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light, wherein
the light-transmissive member has a second concave portion for placement of the support member.
20. The light source device according to claim 18 , further comprising a support member that supports the wavelength conversion layer and the light-transmissive member at a side of the light-transmissive member opposite to the wavelength conversion layer in a direction crossing the traveling direction of the excitation light, wherein
the light-transmissive member has a second concave portion for placement of the support member.
21. The light source device according to claim 11 , wherein
the light-transmissive member is formed using sapphire.
22. The light source device according to claim 11 , wherein
a dielectric multilayer that transmits the excitation light and reflects the fluorescent light is provided between the first light incident surface of the wavelength conversion layer and the light-transmissive member and is provided between the second light incident surface of the wavelength conversion layer and the light-transmissive member.
23. A projector comprising:
the light source device according to claim 11 ;
a light modulation device that modulates a light output from the light source device according to image information and generates an image light; and
a projection system that projects the image light.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016-231400 | 2016-11-29 | ||
JPJP2016-231400 | 2016-11-29 | ||
JP2016231400A JP6766617B2 (en) | 2016-11-29 | 2016-11-29 | Light source device and projector |
PCT/JP2017/040068 WO2018100977A1 (en) | 2016-11-29 | 2017-11-07 | Light source device and projector |
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Publication Number | Publication Date |
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US10976653B1 US10976653B1 (en) | 2021-04-13 |
US20210109430A1 true US20210109430A1 (en) | 2021-04-15 |
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US16/464,334 Active 2038-05-22 US10976653B1 (en) | 2016-11-29 | 2017-11-07 | Light source device and projector |
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US (1) | US10976653B1 (en) |
JP (1) | JP6766617B2 (en) |
CN (1) | CN110036339B (en) |
WO (1) | WO2018100977A1 (en) |
Cited By (2)
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CN113795708A (en) * | 2019-05-09 | 2021-12-14 | 昕诺飞控股有限公司 | Improved thermal management of laser-based illumination using truncated ball lenses |
US11630383B2 (en) | 2020-12-24 | 2023-04-18 | Seiko Epson Corporation | Light source apparatus and projector |
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JP7189422B2 (en) * | 2018-09-27 | 2022-12-14 | 日亜化学工業株式会社 | WAVELENGTH CONVERSION MEMBER COMPOSITE, LIGHT-EMITTING DEVICE, AND METHOD OF MANUFACTURING WAVELENGTH CONVERSION MEMBER COMPOSITE |
DE102020106594A1 (en) | 2019-03-12 | 2020-09-17 | Nichia Corporation | METHOD OF MANUFACTURING AN OPTICAL ELEMENT, OPTICAL ELEMENT, AND LIGHT Emitting Device |
JP7111989B2 (en) * | 2019-04-22 | 2022-08-03 | 日亜化学工業株式会社 | Wavelength conversion component, method for manufacturing wavelength conversion component, and light emitting device |
JP7400632B2 (en) * | 2020-06-04 | 2023-12-19 | セイコーエプソン株式会社 | Lighting equipment and projectors |
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JP6003029B2 (en) * | 2011-09-09 | 2016-10-05 | セイコーエプソン株式会社 | Light source device and projector |
JP2012098442A (en) * | 2010-11-01 | 2012-05-24 | Seiko Epson Corp | Wavelength conversion element, light source device, and projector |
JP2012129151A (en) * | 2010-12-17 | 2012-07-05 | Seiko Epson Corp | Light-emitting element, light source device, and projector |
JP5675320B2 (en) * | 2010-12-17 | 2015-02-25 | 日立マクセル株式会社 | Light source device and projection-type image display device |
JP5433561B2 (en) * | 2010-12-28 | 2014-03-05 | 日立コンシューマエレクトロニクス株式会社 | Light source device |
JP2012169049A (en) | 2011-02-10 | 2012-09-06 | Ushio Inc | Light source device |
JP6248381B2 (en) * | 2012-11-02 | 2017-12-20 | ソニー株式会社 | Optical system, polarization separating / combining element, and display device |
CN104769497B (en) * | 2012-11-07 | 2016-09-28 | 松下知识产权经营株式会社 | light source and image projection device |
JP6119214B2 (en) * | 2012-12-03 | 2017-04-26 | スタンレー電気株式会社 | Light emitting device and vehicle lamp |
WO2014115492A1 (en) * | 2013-01-24 | 2014-07-31 | パナソニック株式会社 | Solid-state light source device |
JP6169383B2 (en) * | 2013-03-25 | 2017-07-26 | スタンレー電気株式会社 | Light emitting module and light source device |
JP5812520B2 (en) | 2013-03-28 | 2015-11-17 | ウシオ電機株式会社 | Fluorescent light source device |
JP5708698B2 (en) * | 2013-04-19 | 2015-04-30 | カシオ計算機株式会社 | Phosphor support, light source device and projector |
JP6357655B2 (en) * | 2013-07-25 | 2018-07-18 | パナソニックIpマネジメント株式会社 | Lighting device |
CN103809350B (en) * | 2013-09-03 | 2017-01-11 | 杨毅 | Display system and display device |
CN107045254B (en) * | 2016-02-05 | 2019-01-15 | 精工爱普生株式会社 | Wavelength changing element, light supply apparatus and projector |
JP6852441B2 (en) * | 2017-02-14 | 2021-03-31 | セイコーエプソン株式会社 | Light source device and projector |
JP7081094B2 (en) * | 2017-08-22 | 2022-06-07 | セイコーエプソン株式会社 | Wavelength conversion element, light source device and projector |
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2016
- 2016-11-29 JP JP2016231400A patent/JP6766617B2/en active Active
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2017
- 2017-11-07 WO PCT/JP2017/040068 patent/WO2018100977A1/en active Application Filing
- 2017-11-07 US US16/464,334 patent/US10976653B1/en active Active
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN113795708A (en) * | 2019-05-09 | 2021-12-14 | 昕诺飞控股有限公司 | Improved thermal management of laser-based illumination using truncated ball lenses |
US20220221129A1 (en) * | 2019-05-09 | 2022-07-14 | Signify Holding B.V. | Improved thermal management in laser-based lighting using a truncated ball lens |
US11630383B2 (en) | 2020-12-24 | 2023-04-18 | Seiko Epson Corporation | Light source apparatus and projector |
Also Published As
Publication number | Publication date |
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CN110036339B (en) | 2021-06-18 |
CN110036339A (en) | 2019-07-19 |
US10976653B1 (en) | 2021-04-13 |
JP6766617B2 (en) | 2020-10-14 |
JP2018087918A (en) | 2018-06-07 |
WO2018100977A1 (en) | 2018-06-07 |
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