WO2015129656A1 - 光源装置 - Google Patents
光源装置 Download PDFInfo
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- WO2015129656A1 WO2015129656A1 PCT/JP2015/055124 JP2015055124W WO2015129656A1 WO 2015129656 A1 WO2015129656 A1 WO 2015129656A1 JP 2015055124 W JP2015055124 W JP 2015055124W WO 2015129656 A1 WO2015129656 A1 WO 2015129656A1
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- WIPO (PCT)
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- light
- light source
- light beam
- lens
- axis direction
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/12—Combinations of only three kinds of elements
- F21V13/14—Combinations of only three kinds of elements the elements being filters or photoluminescent elements, reflectors and refractors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
- F21V17/02—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages with provision for adjustment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
-
- 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
- F21V7/00—Reflectors for light sources
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2066—Reflectors in illumination beam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/30—Semiconductor lasers
Definitions
- the present invention relates to a light source device including a plurality of light sources that generate excitation light and a phosphor that emits fluorescence by absorbing the energy of the excitation light.
- the projection display device includes a light source system, an illumination optical system, and a projection optical system.
- the “light source system” is, for example, a light source system.
- a "system” is a unit or mechanism that functions as a whole while individual elements affect each other. That is, the light source system is a system including a light emitting element that emits light, an optical element, and the like.
- the light source system emits projection light.
- the illumination optical system guides light emitted from the light source system to the light valve.
- the light valve receives the video signal and outputs image light.
- the projection optical system enlarges and projects the image light output from the light valve onto the screen.
- image light refers to light having image information.
- the “light valve” is an optical shutter that controls transmission or reflection of light.
- the light valve is, for example, a liquid crystal panel or DMD (Digital Micro-mirror Device; registered trademark).
- Excitation light is a general term for light that causes excitation in a substance such as a phosphor. Further, the projection light is used in the same meaning as the projection light.
- projection and “projection” mean to cast light.
- LED Light Emitting Diode
- LD Laser Diode
- a means for increasing the brightness is required.
- light emitted from a plurality of excitation light sources is condensed on a phosphor element, thereby generating green fluorescence to increase brightness.
- the phosphor element has a problem of light saturation.
- Light saturation is a reduction in the light output converted to the collected light output.
- the lens array is arranged between a light source and a condensing optical system, so that the uniformity of the light beam condensed on the phosphor is improved, and the local light Saturation is suppressed.
- JP 2013-114980 A (pages 99-105, FIGS. 1 and 6)
- a photosynthesis element that transmits the first excitation light and reflects the second excitation light, the first excitation light, and the first excitation light are provided.
- a phosphor element that emits first fluorescence upon receiving two excitation lights, and an emission angle of the first excitation light emitted from the photosynthetic element and reflection of the second excitation light reflected by the photosynthesizer Due to the difference in angle, the position where the first excitation light transmitted through the photosynthetic element reaches the phosphor element and the second excitation light reflected by the photosynthesis element reaches the phosphor element. The position is different.
- FIG. 1 is a configuration diagram showing a configuration of a projection display device 1 according to Embodiment 1.
- FIG. 3 is a schematic diagram illustrating an arrangement configuration of excitation light sources and collimating lenses of the projection display device 1 according to Embodiment 1.
- FIG. 3 is a schematic diagram illustrating an arrangement configuration of excitation light sources and collimating lenses of the projection display device 1 according to Embodiment 1.
- FIG. 6 is a diagram showing wavelength-transmittance characteristics of the photosynthetic device 70 according to Embodiment 1.
- FIG. 6 is a schematic diagram illustrating another configuration of the photosynthetic device 70 according to Embodiment 1.
- FIG. 3 is a perspective view showing a shape of a light intensity uniformizing element 113 according to Embodiment 1.
- FIG. 6 is a diagram for explaining the characteristics of the photosynthetic element 70.
- FIG. 6 is a simulation diagram illustrating effects of the projection display apparatus 1 according to the first embodiment. It is a schematic diagram showing the illuminance distribution on the phosphor element 40G according to the first embodiment. It is a figure which shows the simulation result of the spot image of the excitation light on the phosphor element 40G which concerns on Embodiment 1.
- FIG. It is a figure which shows the simulation result of the spot image of the excitation light on the phosphor element 40G which concerns on Embodiment 1.
- FIG. It is a figure which shows the simulation result of the spot image of the excitation light on the phosphor element 40G which concerns on Embodiment 1.
- FIG. 6 is a figure which shows the simulation result of the spot image of the excitation light on the phosphor element 40G which concerns on Embodiment 1.
- FIG. 6 is a simulation diagram illustrating effects of the projection display apparatus 1 according to the first embodiment. It is a schematic
- FIG. 3 is a configuration diagram illustrating an arrangement configuration of a blue light source unit 20B according to Embodiment 1.
- FIG. 2 is a diagram for explaining a projection optical system 124 according to Embodiment 1.
- FIG. 3 is a schematic diagram for explaining a relationship between a projection optical system and a projection surface 150 according to Embodiment 1.
- FIG. 6 is a schematic diagram illustrating an illuminance distribution on the light intensity uniformizing element 113 according to Embodiment 1.
- FIG. 6 is a configuration diagram illustrating a configuration of a projection display device according to a second embodiment.
- FIG. 6 is a schematic diagram for explaining the characteristics of a rotary phosphor according to a second embodiment.
- FIG. 6 is a schematic diagram for explaining the characteristics of a rotary phosphor according to a second embodiment.
- FIG. 6 is a schematic diagram for explaining the characteristics of a rotary phosphor according to a second embodiment.
- FIG. 6 is a configuration diagram showing a configuration of a projection display device according to a third embodiment.
- FIG. 6 is a configuration diagram illustrating a configuration of a projection display device according to a fourth embodiment. It is the schematic which shows the shape of the photosynthetic device 2300 which concerns on Embodiment 4.
- FIG. 10 is a simulation diagram illustrating effects of the projection display apparatus according to the fourth embodiment. It is a block diagram which shows the example which applied the light source device 1004 which concerns on Embodiment 4 to the headlight of a car. It is a block diagram which shows the example which applied the light source device 1005 which concerns on Embodiment 4 to the headlight of a car. It is a ray-trajectory diagram explaining the behavior of a light beam in an example in which light source devices 1004 and 1005 according to Embodiment 4 are applied to a headlight of a car.
- the X axis, Y axis, and Z axis in FIG. 1 are orthogonal to each other.
- the X axis is parallel to the optical axis OA of the projection optical system 124.
- the ⁇ X axis direction is the traveling direction of light in the projection optical system 124, and the opposite direction is the + X axis direction.
- the Y axis is parallel to the height direction of the projection display device 1.
- the upward direction of the projection display device 1 is the + Y axis direction, and the downward direction is the ⁇ Y axis direction.
- the Z axis is parallel to the horizontal direction of the projection display device 1.
- the Z axis is parallel to the width direction of the projection display device 1.
- the right direction is the + Z-axis direction and the left direction is the -Z-axis direction when viewed from the direction (-X-axis direction) in which the projection light Ro is emitted from the projection display device 1.
- a surface from which the projection light Ro of the projection display device 1 is emitted is referred to as “front”.
- a projection display device will be described as an example.
- a vehicle headlight will be described as an example.
- FIG. 1 is a block diagram schematically showing the main configuration of a projection display apparatus 1 according to Embodiment 1 of the present invention.
- the projection display device 1 includes a light source device 2, a light intensity uniformizing element 113, an illumination optical system, a light valve 121, and a projection optical system 124. Further, the projection display apparatus 1 can include a condensing optical system 80.
- the illumination optical system can include a relay lens group 115, a bending mirror 120, or a condenser lens 122.
- the relay lens group 115 can include, for example, an uneven lens (meniscus lens) 116, a convex lens 117, or a biconvex lens 118.
- the condensing optical system 80 can include, for example, a convex lens 81 or a concave / convex lens (meniscus lens) 82.
- the light source device 2 can include a first excitation light source unit 10a, a second excitation light source unit 10b, or a photosynthetic element 70.
- a first excitation light source unit 10a for example, a first excitation light source group 110A and a first collimating lens group 115A are provided.
- a second excitation light source unit 10b for example, a second excitation light source group 110B and a second collimating lens group 115B are provided.
- the light source device 2 can include an afocal optical system.
- An afocal optical system is an optical system with an infinite focal length.
- the afocal optical system includes a biconvex lens 101 and a biconcave lens 102.
- the light source device 2 can include lens groups 200 and 300.
- the lens group 200 includes a convex lens 201 and a concave lens 202, for example.
- the lens group 300 includes a convex lens 301 and a concave lens 302, for example.
- the light source device 2 can include a condenser lens group 400.
- the condenser lens group 400 includes a convex lens 401 and an aspherical convex lens 402.
- the light source device 2 can include a bending mirror 71, a color separation filter 72, or a color separation filter 73.
- the light source device 2 can include a phosphor element 40G.
- the phosphor element 40G emits green fluorescence, for example.
- the light source device 2 can include a blue light source unit 20B.
- the blue light source unit 20B includes, for example, a blue light source group 210B and a collimating lens group 215B.
- the light source device 2 can include a red light source unit 30R.
- the red light source unit 30R includes, for example, a red light source group 310R and a collimating lens group 315R.
- the light source device 2 can include a control unit 3.
- a light valve 121 is a spatial light modulator that spatially modulates an incident light beam.
- the light valve 121 performs two-dimensional variable control of the characteristics of the incident light beam.
- the “characteristic” is, for example, the phase, polarization state, intensity, or propagation direction of light. That is, the light valve 121 controls light. Or the light valve 121 adjusts light.
- the light valve is an optical element that controls light from a light source and outputs it as image light.
- image light refers to light having image information.
- the light valve 121 is, for example, a reflective spatial light modulator.
- a digital micromirror device hereinafter referred to as DMD (Digital Micro-mirror Device)
- DMD Digital Micro-mirror Device
- a reflective liquid crystal element or a transmissive liquid crystal element can be used.
- the light valve 121 receives, for example, a light beam emitted from the condenser lens 122.
- the control unit 3 generates a modulation control signal MC based on the image signal VS supplied from an external signal source (not shown).
- the controller 3 supplies this modulation control signal MC to the light valve 121.
- the light valve 121 spatially modulates the incident light beam according to the modulation control signal MC.
- the light valve 121 generates and outputs modulated light by spatial modulation of the incident light beam.
- An optical image is displayed by projecting the modulated light onto the projection surface 150.
- Modulated light is light converted into an optical image for projecting an image signal onto a projection surface.
- Image light and “modulated light” are used interchangeably.
- the “projection surface” is a screen or the like that displays an image.
- the projection optical system 124 refracts the modulated light (image light) emitted from the light valve 121 and emits the projection light Ro.
- the projection light Ro is emitted from the front surface 124 f of the projection optical system 124 toward the projection surface 150.
- the projection optical system 124 can enlarge and project an optical image represented by the modulated light onto a projection surface 150 such as an external screen.
- the projection optical system 124 magnifies and projects the modulated light.
- the projection optical system 124 is, for example, a projection lens.
- the projection surface 150 is, for example, a screen installed outside.
- FIG. 2 is a schematic diagram illustrating an arrangement configuration of the first excitation light source (first excitation light source group 110A) and the first collimating lens (first collimating lens group 115A) of the projection display device 1. is there.
- FIG. 3 is a schematic diagram illustrating an arrangement configuration of the second excitation light source (second excitation light source group 110B) and the second collimating lens (second collimating lens group 115B) of the projection display device 1. is there.
- the first excitation light source unit 10a includes a plurality of first excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, arranged in a plane. 35a, 41a, 42a, 43a, 44a, 45a, 51a, 52a, 53a, 54a, 55a (hereinafter referred to as first excitation light source group 110A).
- the first excitation light source unit 10a includes a plurality of first collimating lenses 16a, 17a, 18a, 19a, 20a, 26a, 27a, 28a, 29a, 30a, 36a, 37a, and 38a arranged in a plane. , 39a, 40a, 46a, 47a, 48a, 49a, 50a, 56a, 57a, 58a, 59a, 60a (hereinafter referred to as first collimating lens group 115A).
- the first collimating lens group 115A is arranged on the ⁇ X axis direction side of the corresponding first excitation light source group 110A.
- the first collimating lens 16a is disposed on the ⁇ X axis direction side of the corresponding first excitation light source 11a. Therefore, in FIG. 2, the first excitation light source group 110A is represented by a broken line.
- the first excitation light source 11a is represented by a broken line.
- First excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a, 42a, 43a, 44a, 45a, 51a, 52a, 53a , 54a, 55a each emits a light beam in the ⁇ X-axis direction. That is, the first excitation light source group 110A emits a plurality of light beams in the ⁇ X axis direction.
- Each of 57a, 58a, 59a, 60a has a corresponding first excitation light source 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a,
- the light beams emitted from 42a, 43a, 44a, 45a, 51a, 52a, 53a, 54a, and 55a are collimated.
- the first collimating lens group 115A collimates a plurality of light beams emitted from the first excitation light source group 110A in the ⁇ X axis direction.
- the first collimating lens 16a collimates the light beam emitted from the corresponding first excitation light source 11a.
- the first excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a, 42a, 43a, 44a, 45a , 51a, 52a, 53a, 54a, 55a are arranged on the YZ plane.
- the first excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a, 42a, 43a, 44a , 45a, 51a, 52a, 53a, 54a, 55a are regularly arranged.
- the regular arrangement is, for example, a matrix-like arrangement described later.
- First excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a, 42a, 43a, 44a, 45a, 51a, 52a, 53a , 54a, 55a for example, a blue laser diode (blue LD: Blue Laser Diode) that outputs laser light in a blue wavelength region may be used.
- blue laser diode blue LD: Blue Laser Diode
- the center wavelength is 450 nm.
- An excitation light source having a center wavelength of 405 nm may be used.
- the first excitation light source group 110A is arranged in a matrix of 5 rows and 5 columns on the YZ plane.
- the “matrix” has “row” and “column” which are two orthogonal directions on a plane.
- a light source or the like is arranged at a position where “row” and “column” intersect. Therefore, “arrange in a matrix” is an example of regular arrangement on a plane.
- the first excitation light source group 110A and the first collimating lens group 115A are arranged in the + X-axis direction of the light intensity uniformizing element 113 and the relay lens group 115.
- the first excitation light source group 110A emits a light beam in the ⁇ X axis direction.
- the first collimating lens group 115A is disposed on the ⁇ X axis direction side of the first excitation light source group 110A.
- the first collimating lens group 115A emits the light emitted from the first excitation light source group 110A as a parallel light flux.
- the first collimating lens group 115A emits the light emitted from the first excitation light source group 110A in the ⁇ X axis direction.
- the light combining element 70 is arranged on the ⁇ X axis direction side of the first collimating lens group 115A.
- the parallel light beam emitted from the first collimating lens group 115A enters the light combining element 70. Thereafter, the parallel light flux incident on the light combining element 70 passes through the light combining element 70. That is, the light synthesizing element 70 has a characteristic of transmitting the parallel light beam emitted from the first collimating lens group 115A. The characteristics of the photosynthetic element 70 will be described later.
- the parallel light flux that has passed through the light combining element 70 travels in the ⁇ X-axis direction.
- the biconvex lens 101 is arranged in the ⁇ X-axis direction of the light combining element 70.
- the parallel light flux that has passed through the light combining element 70 travels toward the biconvex lens 101.
- the second excitation light source unit 10b includes a plurality of second excitation light sources 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, arranged in a plane. 35b, 41b, 42b, 43b, 44b, 45b, 51b, 52b, 53b, 54b, 55b (hereinafter referred to as second excitation light source group 110B).
- the second excitation light source unit 10b includes a plurality of second collimating lenses 16b, 17b, 18b, 19b, 20b, 26b, 27b, 28b, 29b, 30b, 36b, 37b, and 38b arranged in a plane. , 39b, 40b, 46b, 47b, 48b, 49b, 50b, 56b, 57b, 58b, 59b, 60b (hereinafter referred to as the second collimating lens group 115B).
- the second collimating lens group 115B is disposed on the ⁇ Z axis direction side of the corresponding second excitation light source group 110B.
- the second collimating lens 16b is disposed on the ⁇ Z axis direction side of the corresponding second excitation light source 11b.
- the 2nd excitation light source group 110B is represented by the broken line.
- the second excitation light source 11b is represented by a broken line.
- Second excitation light sources 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, 35b, 41b, 42b, 43b, 44b, 45b, 51b, 52b, 53b , 54b and 55b each emit a light beam in the ⁇ Z-axis direction. That is, the second excitation light source group 110B emits a plurality of light beams in the ⁇ Z-axis direction.
- Each of 57b, 58b, 59b, 60b has a corresponding second excitation light source 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, 35b, 41b,
- the light beams emitted from 42b, 43b, 44b, 45b, 51b, 52b, 53b, 54b, and 55b are collimated.
- the second collimating lens group 115B collimates a plurality of light beams emitted from the second excitation light source group 110B in the ⁇ Z-axis direction.
- the second collimating lens 16b collimates the light beam emitted from the corresponding second excitation light source 11b.
- the second excitation light sources 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, 35b, 41b, 42b, 43b, 44b, 45b , 51b, 52b, 53b, 54b, 55b are arranged on the XY plane.
- the second excitation light sources 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, 35b, 41b, 42b, 43b, 44b , 45b, 51b, 52b, 53b, 54b, 55b are regularly arranged.
- the regular arrangement is, for example, a matrix-like arrangement described later.
- Second excitation light sources 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, 35b, 41b, 42b, 43b, 44b, 45b, 51b, 52b, 53b , 54b, and 55b may be blue laser diodes (blue LD: Blue Laser Diode) that output laser light in a blue wavelength region, for example.
- blue LD Blue Laser Diode
- the center wavelength is 450 nm.
- An excitation light source having a center wavelength of 405 nm may be used.
- the polarization directions of 44b, 45b, 51b, 52b, 53b, 54b, and 55b are set according to the first excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, and 34a.
- 35a, 41a, 42a, 43a, 44a, 45a, 51a, 52a, 53a, 54a, and 55a are different by 90 degrees.
- the first excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a, 42a, 43a, 44a, 45a, 51a, 52a , 53a, 54a, and 55a are P-polarized light.
- the second excitation light sources 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, 35b, 41b, 42b, 43b, 44b, 45b, 51b, 52b , 53b, 54b, and 55b are S-polarized light.
- the second excitation light source group 110B is arranged in a matrix of 5 rows and 5 columns on the XY plane.
- the second excitation light source group 110B and the second collimating lens group 115B are disposed in the + X-axis direction of the light intensity uniformizing element 113 and the relay lens group 115.
- the second excitation light source group 110B emits a light beam in the ⁇ Z axis direction.
- the second collimating lens group 115B is arranged on the ⁇ Z axis direction side of the second excitation light source group 110B.
- the second collimating lens group 115B emits the light emitted from the second excitation light source group 110B as a parallel light flux.
- the second collimating lens group 115B emits the light emitted from the second excitation light source group 110B in the ⁇ Z-axis direction.
- the light synthesizing element 70 is disposed on the ⁇ Z-axis direction side of the second collimating lens group 115B.
- the parallel light beam emitted from the second collimating lens group 115B enters the light combining element 70 at an angle A. Thereafter, the parallel light flux incident on the light combining element 70 is reflected by the light combining element 70. That is, the light combining element 70 has a characteristic of reflecting the parallel light flux emitted from the second collimating lens group 115B.
- the parallel light beam reflected by the light combining element 70 travels in the ⁇ X axis direction.
- the angle A is an angle obtained by subtracting the incident angle P1 from 90 degrees.
- the incident angle P1 is defined as an angle between the traveling direction of light and the perpendicular of the boundary surface.
- the angle A is the angle formed between the light emitted from the second excitation light source group 110 ⁇ / b> B and the reflection surface of the light combining element 70.
- the biconvex lens 101 is arranged in the ⁇ X-axis direction of the light combining element 70.
- the parallel light beam reflected by the light combining element 70 travels toward the biconvex lens 101.
- the parallel light beam emitted from the first collimating lens group 115A and the parallel light beam emitted from the second collimating lens 115B are combined on the same optical path.
- the luminous flux emitted from the first excitation light source group 110A and the luminous flux emitted from the second excitation light source group 110B are combined on the same optical path.
- the photosynthetic device 70 exhibits, for example, the wavelength-transmission characteristics shown in FIG.
- FIG. 4 is a diagram showing the wavelength-transmittance characteristics of the photosynthetic device 70.
- the vertical axis in FIG. 4 represents the light transmittance [%].
- the horizontal axis of FIG. 4 is the wavelength [nm] of light.
- FIG. 4 shows a spectrum of an excitation light source having a center wavelength of 450 nm as a solid line 4000a.
- the transmittance characteristic of S-polarized light is indicated by a broken line 4000 s.
- the transmission characteristic of P-polarized light is indicated by a one-point difference line 4000p.
- the photosynthetic element 70 has a characteristic of transmitting P-polarized light having a center wavelength of 450 nm. Further, it can be confirmed that the photosynthetic device 70 has a characteristic of reflecting S-polarized light having a center wavelength of 450 nm.
- the first excitation light source group 110A is P-polarized light and the second excitation light source group 110B is S-polarized light.
- the light emitted from the first excitation light source group 110 ⁇ / b> A passes through the light combining element 70.
- the light emitted from the second excitation light source group 110 ⁇ / b> B is reflected by the light combining element 70.
- Both the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B travel in the ⁇ X axis direction.
- the light combining element 70 may adopt another configuration as long as the first excitation light source group 110A and the second excitation light source group 110B are combined.
- FIGS. 5A and 5B are schematic views showing other configurations of the photosynthetic element 70.
- FIG. 5A shows an example of the light combining element 70a in which the reflective regions 74 and the transmissive regions 75 are alternately formed in a stripe shape.
- FIG. 5B is an example of a photosynthetic element 70b in which the reflection region 74 and the transmission region 75 are formed in a staggered pattern.
- the reflective regions 74 and the transmissive regions 75 may be alternately formed in a stripe shape. An example is shown in FIG. Then, it becomes possible to synthesize light regardless of the polarization direction.
- a plurality of mirrors having a reflection surface at the position of the reflection region 74 may be arranged.
- the transmission region 75 may be a spatial region that does not pass through the inside of the optical member (the light combining element 70).
- “Houndstooth check” means that two rows are arranged alternately. That is, two different things are arranged in two rows by sequentially changing the rows. For example, the reflective region 74 and the transmissive region 75 are arranged in two rows by sequentially changing the rows.
- FIG. 5B shows an example of a houndstooth-shaped photosynthetic element 70b in which the reflection region 74 and the transmission region 75 are arranged in 8 rows and 8 columns.
- the gray part is the reflection region 74.
- the reflective surface of the reflective region 74 is formed by evaporating a reflective metal film on a glass surface, for example.
- the transmissive region 75 is a region where a reflective surface is not formed on the glass surface, such as the reflective region 74.
- the reflecting surface of the reflecting region 74 and the transmitting surface of the transmitting region 75 are formed on the same plane.
- the light beam emitted from the light combining element 70 is formed by a bundle of a plurality of light beams emitted from the excitation light source groups 110A and 110B.
- a bundle of a plurality of light beams is called a total light beam.
- the diameter of the total luminous flux becomes smaller, the light collection efficiency to the phosphor element 40G is improved.
- the light beam that has passed through the light combining element 70 and the reflected light beam are incident on the biconvex lens 101.
- the biconvex lens 101 and the biconcave lens 102 reduce the diameter of the total luminous flux formed by a bundle of a plurality of parallel luminous fluxes, and then convert them again into parallel luminous fluxes.
- the biconvex lens 101 condenses a plurality of parallel light beams (total light beams).
- the biconvex lens 101 has a convex shape on both sides.
- the biconvex lens 101 may be a convex lens only on one side.
- the biconcave lens 102 converts a plurality of condensed light beams (total light beams) into parallel light beams.
- the biconcave lens 102 has, for example, a concave shape on both sides.
- the biconcave lens 102 may be a concave lens only on one side.
- the bending mirror 71 is arranged in the ⁇ X axis direction of the biconvex lens 101.
- the condensed light beam emitted from the biconvex lens 101 enters the bending mirror 71 at an angle B.
- an angle formed by the light reflected or transmitted by the light combining element 70 and the reflecting surface of the bending mirror 71 is an angle B.
- the angle A when the angle A is 45 degrees, the central ray of the condensed light beam emitted from the biconvex lens 101 is parallel to the X axis. Therefore, the condensed light beam emitted from the biconvex lens 101 is incident on the bending mirror 71 inclined at an angle B with respect to the XY plane.
- the angle B is the angle rotated clockwise from the + Y axis with respect to the XY plane.
- the angle B is an angle obtained by subtracting the incident angle P1 from 90 degrees.
- the incident angle P1 is defined as an angle between the traveling direction of light and the perpendicular of the boundary surface.
- the biconcave lens 102 is arranged in the ⁇ Z-axis direction of the bending mirror 71.
- the condensed light beam reflected by the bending mirror 71 travels in the direction of the biconcave lens 102. That is, the condensed light beam reflected by the bending mirror 71 travels in the ⁇ Z axis direction.
- the condensed light beam reflected by the bending mirror 71 enters the biconcave lens 102.
- the parallel light beam emitted from the biconcave lens 102 travels in the ⁇ Z axis direction.
- the color separation filter 72 is arranged in the ⁇ Z-axis direction of the biconcave lens 102.
- the parallel light beam emitted from the biconcave lens 102 travels in the ⁇ Z axis direction. That is, the parallel light beam emitted from the biconcave lens 102 travels in the direction of the color separation filter 72.
- the parallel light beam emitted from the biconcave lens 102 enters the color separation filter 72.
- the parallel light beam emitted from the biconcave lens 102 passes through the color separation filter 72.
- the parallel light flux that has passed through the color separation filter 72 travels in the ⁇ Z-axis direction.
- the condenser lens group 400 is arranged in the ⁇ Z-axis direction of the color separation filter 72.
- the light beam that has passed through the color separation filter 72 travels in the ⁇ Z axis direction. That is, the light beam that has passed through the color separation filter 72 travels in the direction of the condenser lens group 400.
- the light beam that has passed through the color separation filter 72 enters the condenser lens group 400.
- the light beam that has passed through the color separation filter 72 passes through the condenser lens group 400.
- the light beam that has passed through the condenser lens group 400 travels in the ⁇ Z-axis direction.
- the condensing lens group 400 includes, for example, two convex lenses 401 and 402.
- the condensing lens group 400 condenses the light beam transmitted through the color separation filter 72 on the phosphor element 40G.
- the phosphor element 40G is arranged in the ⁇ Z-axis direction of the condenser lens group 400.
- the light beam that has passed through the condenser lens group 400 travels in the ⁇ Z-axis direction. That is, the light beam transmitted through the condensing lens group 400 travels in the direction of the phosphor element 40G.
- the light beam that has passed through the condenser lens group 400 is condensed on the phosphor element 40G.
- the color separation filter 72 has, for example, an optical characteristic of reflecting incident light in the green wavelength region and incident light in the red wavelength region.
- the color separation filter 72 has an optical characteristic of transmitting incident light in the blue wavelength region.
- the color separation filter 72 can be configured by a dichroic mirror having a dielectric multilayer film.
- the “wavelength range” indicates a range of light wavelengths.
- the blue wavelength range is from 430 nm to 485 nm.
- the green wavelength range is from 500 nm to 570 nm.
- the red wavelength range is from 600 nm to 650 nm.
- the phosphor element 40G absorbs an incident light beam as excitation light. Then, the phosphor element 40G outputs light in the green wavelength region whose main wavelength is 550 nm.
- the light beam emitted from the first excitation light source group 110A shown in FIG. 1 and the light beam emitted from the second excitation light source group 110B are combined on the same optical path by the light combining element 70.
- the luminous fluxes emitted from the excitation light source groups 110A and 110B can achieve twice as high luminance.
- the interval between the plurality of parallel light beams emitted from the excitation light source groups 110A and 110B is narrowed by the biconvex lens 101 and the biconcave lens 102.
- the diameter of the total light beam formed by the bundle of a plurality of parallel light beams incident on the phosphor element 40G is reduced.
- the diameter of the lens 402 can be reduced, and the size can be reduced.
- the main wavelength of the green wavelength region emitted from the phosphor element 40G is not limited to 550 nm, and may be 520 nm, for example.
- a light diffusing element may be disposed between the biconcave lens 102 and the color separation filter 72 in order to make the intensity distribution of the light beam condensed on the phosphor element 40G uniform. By disposing the light diffusing element, the deviation of the light density of the light flux at the condensing position is reduced.
- the temperature rise on the phosphor element 40G is suppressed. For this reason, the conversion efficiency of the phosphor element 40G is improved. Moreover, the lifetime of the phosphor element 40G can be extended.
- the phosphor element 40G is arranged in a fixed state in the first embodiment. However, it is not limited to this.
- a green phosphor coated on a rotating plate may be used in place of the phosphor element 40G.
- the green phosphor may be applied to the periphery of the rotating plate.
- the cooling mechanism of the phosphor element 40G can be simplified. That is, since the position of the light condensed on the green phosphor is not fixed and always changes according to the rotation of the rotating plate, it is possible to suppress an increase in the temperature of a part of the green phosphor.
- the condensing lens group 400 includes two convex lenses 401 and 402 in FIG.
- the convex lens 402 has an aspherical shape.
- the condensing lens group 400 has a two-lens configuration.
- the number of lenses in the condenser lens group 400 is not limited to two.
- the condensing lens group 400 may have a three-lens configuration.
- Synthetic quartz is a glass material having a low coefficient of linear expansion and a high heat resistance temperature.
- a glass material having high heat resistance such as synthetic quartz generally has a low refractive index. For this reason, it is difficult to increase the light collection efficiency with the two-lens configuration, depending on the configuration.
- the lens closest to the phosphor element 40G is close to the light beam condensing position, the light intensity is high and a temperature gradient is likely to occur in the lens.
- a temperature gradient occurs in the lens, a tensile stress is generated in the lens due to the factor of the temperature gradient. And it becomes easy to generate
- a glass material having a low coefficient of linear expansion and high heat resistance such as synthetic quartz, it is possible to extend the life of a high-power light source device.
- the lens closest to the phosphor element 40G is a convex lens 401.
- the condenser lens group 400 is arranged in the + Z-axis direction of the phosphor element 40G.
- the light emitted from the phosphor element 40G travels in the + Z-axis direction.
- the light emitted from the phosphor element 40 ⁇ / b> G enters the condenser lens group 400.
- the condensing lens group 400 collimates and emits the light emitted from the phosphor element 40G.
- the color separation filter 72 is arranged in the + Z-axis direction of the condenser lens group 400.
- the color separation filter 72 is disposed in the + Z-axis direction of the phosphor element 40G.
- the light transmitted through the condenser lens group 400 travels in the + Z-axis direction.
- the light transmitted through the condenser lens group 400 reaches the color separation filter 72.
- the light (green fluorescence) transmitted through the condenser lens group 400 is reflected by the color separation filter 72.
- the color separation filter 73 is arranged in the ⁇ X axis direction of the color separation filter 72.
- the light reflected by the color separation filter 72 travels in the ⁇ X axis direction.
- the light reflected by the color separation filter 72 reaches the color separation filter 73.
- the light (green fluorescence) reflected by the color separation filter 72 is reflected by the color separation filter 73.
- the condensing optical system 80 is disposed in the + Z-axis direction of the color separation filter 73.
- the light reflected by the color separation filter 73 travels in the + Z-axis direction.
- the light reflected by the color separation filter 73 reaches the condensing optical system 80.
- the light reflected by the color separation filter 73 is collected by the condensing optical system 80.
- the light intensity uniformizing element 113 is arranged in the + Z-axis direction of the condensing optical system 80.
- the light condensed by the condensing optical system 80 travels in the + Z-axis direction.
- the condensed light condensed by the condensing optical system 80 is condensed on the incident end face 113 i of the light intensity uniformizing element 113.
- the incident end face 113 i is an end face on the ⁇ Z-axis direction side of the light intensity uniformizing element 113.
- the color separation filter 73 has an optical characteristic of transmitting light in the red wavelength region.
- the color separation filter 73 has an optical characteristic of reflecting light in the green wavelength range and light in the blue wavelength range.
- the color separation filter 73 can include a dichroic mirror formed of a dielectric multilayer film.
- the biconvex lens 101 and the biconcave lens 102 described above have a function of collimating the incident light beam. However, it is not limited to this.
- the combination of the biconvex lens 101, the biconcave lens 102, and the condenser lens group 400 may condense the light emitted from the excitation light source groups 110A and 110B onto the phosphor element 40G.
- the light emitted from the phosphor element 40G (light emitted from the phosphor) is condensed on the incident end face 113i of the light intensity equalizing element 113 by the combination of the condenser lens group 400 and the condenser optical system 80. There is a need.
- the light beams traveling from the condenser lens group 400 toward the color separation filter 72 are collimated. That is, it is preferable that the biconvex lens 101 and the biconcave lens 102 have a function of collimating the incident light beam.
- the light intensity uniformizing element 113 is an optical element that uniformizes the light intensity distribution of the incident light beam.
- the light intensity equalizing element 113 equalizes the light intensity distribution on a plane perpendicular to the optical axis of the light intensity equalizing element 113.
- the optical axis of the light intensity uniformizing element 113 coincides with the optical axis of the light incident from the incident end face 113i.
- the light intensity equalizing element 113 equalizes the light intensity distribution on the cross section perpendicular to the optical axis of the light incident from the incident end face 113i.
- the light propagating through the light intensity uniformizing element 113 repeats total reflection on the inner surface of the light intensity uniformizing element 113. Thereby, the light propagating through the light intensity uniformizing element 113 becomes superimposed light in the vicinity of the emission end face 113o.
- the light intensity distribution on the exit end face 113o is made more uniform than the light intensity distribution on the entrance end face 113i.
- the light intensity equalizing element 113 emits light as light with increased light intensity distribution uniformity.
- the light emitted from the emission end face 113o has a uniform light intensity distribution.
- the emission end face 113o of the light intensity uniformizing element 113 serves as a surface light source that emits light with uniform luminance.
- the emission end face 113 o is an end face on the + Z-axis direction side of the light intensity uniformizing element 113.
- the light intensity distribution of the light beam incident on the light valve 121 is made uniform. That is, the light valve 121 receives a light beam having a uniform light intensity distribution. The light valve 121 emits a light beam having a uniform light intensity distribution as modulated light.
- the light intensity uniformizing element 113 is made of a transparent optical material.
- the transparent optical material is a glass material or a transparent resin material.
- the light intensity equalizing element 113 is a polygonal column (rod).
- the light intensity uniformizing element 113 includes an incident end face 113i, an exit end face 113o, and a side face.
- the side surface is a surface connecting the incident end surface 113i and the emission end surface 113o.
- This polygonal column is used as a total reflection surface.
- the light propagating inside the light intensity uniformizing element 113 is totally reflected at the interface between the optical material and the outside air.
- the light intensity equalizing element 113 can be a hollow pipe (light pipe).
- the hollow portion has a side surface of the light reflecting mirror. That is, a light reflecting film that reflects light is formed on the inner side surface of the hollow pipe.
- the cross section of the hollow pipe has, for example, a polygonal shape.
- FIG. 6 is a perspective view showing an example of the light intensity equalizing element 113.
- the light intensity equalizing element 113 shown in FIG. 6 has a quadrangular prism shape.
- the light intensity uniformizing element 113 has a rectangular cross section on the XY plane.
- the side surface of the light intensity uniformizing element 113 is configured as a light reflection mirror or a total reflection surface.
- the light intensity uniformizing element 113 has the longitudinal direction in the Z-axis direction.
- the “longitudinal direction” is a direction parallel to the long side of the quadrangular prism. That is, the “long side of the quadrangular column” is the longest side among the 12 sides of the quadrangular column. Usually, there are four longest sides of a quadrangular prism.
- the light intensity equalizing element 113 has a columnar shape.
- a “column” is a columnar space figure having two congruent plane figures as the bottom face. The distance between the two bottom surfaces is called the height of the column. Moreover, the surface that is not the bottom surface of the column is called a side surface.
- the two bottom surfaces are parallel to the XY plane. Further, the height direction of the column is the Z-axis direction.
- the incident end face 113i and the exit end face 113o are formed on a columnar bottom.
- the emission end face 113o of the light intensity equalizing element 113 and the light modulation surface of the light valve 121 are in an optically conjugate relationship.
- the “conjugate relationship” is a relationship between an object and an image in the optical system. When in the conjugate relationship, light emitted from one point gathers at one point.
- the image on the emission end face 113o is formed on the light modulation surface of the light valve 121. Therefore, from the viewpoint of light utilization efficiency, the aspect ratio L: H of the light modulation surface of the light valve 121 preferably matches the aspect ratio L0: H0 of the emission end face 113o of the light intensity uniformizing element 113.
- the horizontal dimensions are dimensions L and L0.
- the vertical dimensions are dimensions H and H0.
- L: H 4: 3.
- the long side is horizontal and the short side is vertical.
- a relay lens group 115 is disposed in the + Z-axis direction of the light intensity uniformizing element 113.
- the light emitted from the emission end face 113o of the light intensity uniformizing element 113 travels in the + Z-axis direction. Then, the light emitted from the emission end face 113o of the light intensity uniformizing element 113 reaches the relay optical system. In FIG. 1, the light emitted from the emission end face 113 o of the light intensity equalizing element 113 enters the relay lens group 115.
- the relay optical system guides a light beam having a uniform light intensity distribution to the light valve 121.
- the “relay optical system” is an optical system from the relay lens group 115 to the light valve 121.
- the relay lens group 115 includes, for example, a concave / convex lens (meniscus lens) 116, a convex lens 117, and a biconvex lens 118.
- the concave / convex lens is a lens in which one of the two lens surfaces is concave and the other lens surface is convex.
- the relay lens group 115 includes three lenses 116, 117, and 118.
- the relay lens group 115 may be composed of two lenses. In this case, it is preferable in design to narrow the distance between the light intensity uniformizing element 113 and the bending mirror 120.
- the bending mirror 120 is arranged in the + Z-axis direction of the relay lens group 115.
- the light emitted from the relay lens group 115 travels in the + Z-axis direction. Then, the light emitted from the relay lens group 115 reaches the bending mirror 120. The light beam emitted from the emission end face 113 o of the light intensity uniformizing element 113 passes through the relay lens group 115 and reaches the bending mirror 120.
- the folding mirror 120 has a function of bending the optical path of the light beam.
- the light beam that has passed through the relay lens group 115 is reflected by the bending mirror 120 toward the condenser lens 122.
- the condensing lens 122 is disposed on the + X axis direction side of the bending mirror 120 in FIG.
- the condenser lens 122 is disposed between the bending mirror 120 and the light valve 121.
- the light beam that has passed through the relay lens group 115 is reflected by the bending mirror 120 toward the light valve 121.
- the light reflected by the bending mirror 120 reaches the condenser lens 122.
- the condensing lens 122 condenses the incident light.
- the light valve 121 is disposed on the + X axis direction side of the condenser lens 122.
- the light condensed by the condensing optical system 122 travels to the + X axis direction side.
- the condensed light condensed by the condensing optical system 122 is condensed on the light valve 121.
- the light beam reflected by the bending mirror 120 passes through the condenser lens 122 and enters the light valve 121.
- the various optical members 400, 72, 73, 80, 113, 115, 120, 122 described above constitute a light guide optical system that guides the light emitted from the phosphor element 40G to the light valve 121.
- Light guide refers to guiding light.
- the light emitted from the phosphor element 40G is guided from the phosphor element 40G to the light valve 121.
- the control unit 3 has a function of controlling the operation of the light valve 121.
- the control unit 3 can have a function of controlling the timing at which the first excitation light source group 110A, the second excitation light source group 110B, the blue light source group 210B, or the red light source group 310R emits light.
- This timing of light emission is performed individually for each light source according to the image signal VS.
- the controller 3 controls the operation of the light valve 121 in accordance with the respective light emission timings of the first excitation light source group 110A, the second excitation light source group 110B, the blue light source group 210B, and the red light source group 310R.
- the central ray of the condensed light beam emitted from the biconvex lens 101 is parallel to the X axis. Further, the bending mirror 71 is rotated by an angle B clockwise with respect to the XY plane as viewed from the + Y axis.
- FIG. 7A and 7B are diagrams for explaining the characteristics of the photosynthetic element 70.
- FIG. 7A is a diagram for explaining characteristics when light passes through the light combining element 70.
- FIG. 7B is a view for explaining characteristics when light is reflected by the light combining element 70.
- the light combining element 70 is shown as a light combining element 700a.
- the light combining element 70 is shown as a light combining element 700b.
- First excitation light sources 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a, 42a, 43a, 44a, 45a, 51a, 52a, 53a , 54a and 55a pass through the light combining element 70 without changing the traveling direction regardless of the angle A. Therefore, as shown in FIG. 7A, the light beam 701a transmitted through the light combining element 700a travels in a direction parallel to the X axis in FIG.
- a light combining element 700a illustrated in FIG. 7A corresponds to the light combining element 70 illustrated in FIG.
- the angle 35 degrees shown in FIG. 7A corresponds to the angle A shown in FIG.
- the light beam transmitted through the light combining element 70 is converted into a parallel light beam by the first collimating lens group 115A.
- the light beam 701a incident on the photosynthetic element 700a at 55 degrees is emitted from the photosynthesizer element 700a at 55 degrees.
- the angle 55 degrees at which the light ray 701a is incident on the light combining element 700a is an angle obtained by subtracting the incident angle P1 from 90 degrees.
- the angle 55 degrees at which the light beam 701a is emitted from the light combining element 700a is an angle obtained by subtracting the emission angle P2 from 90 degrees.
- incident angle P1 is defined as an angle between the light traveling direction and the perpendicular of the boundary surface.
- emission angle P2 is defined as an angle between the light traveling direction and the perpendicular of the boundary surface.
- the angle formed by the optical axis of the light emitted from the first excitation light source unit 10a and the optical axis of the light emitted from the second excitation light source unit 10b is 90 degrees. Therefore, the angle 55 degrees at which the light ray 701a enters the light combining element 700a is an angle obtained by subtracting the angle A shown in FIG. 1 from 90 degrees.
- the axis C1 is defined as follows. From the state where the light beam 701a is perpendicularly incident on the light combining element 700a, the light combining element 700a is rotated around the axis perpendicular to the light beam 701a (the rotation axis of the light combining element 700a). In this case, the axis C1 is a perpendicular to the plane including the light beam 701a and the rotation axis of the light combining element 700a.
- the optical axis of the light emitted from the second excitation light source unit 10b coincides with the axis C1.
- the axis C1 shown in FIG. 7A corresponds to the Z axis shown in FIG.
- the photosynthetic element 700a is rotated 35 degrees around the rotation axis of the photosynthesizer 700a.
- the angle formed between the incident surface of the light combining element 700a and the light beam 701a is 55 degrees.
- the second excitation light sources 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b, 31b, 32b, 33b, 34b, 35b, 41b, 42b, 43b, 44b, 45b, 51b, 52b , 53b, 54b, and 55b enter the light combining element 70 at an angle A and are reflected at an angle A.
- the light beam 701b incident on the light combining element 700b at an angle of 35 degrees is emitted from the light combining element 700b at an angle of 35 degrees.
- a light combining element 700b illustrated in FIG. 7B corresponds to the light combining element 70 illustrated in FIG.
- the angle 35 degrees shown in FIG. 7B corresponds to the angle A shown in FIG.
- the light beam reflected by the light combining element 70 is converted into a parallel light beam by the second collimating lens group 115B.
- the angle formed by the reflection surface of the light combining element 700b and the light beam 701b incident on the light combining element 700b is 35 degrees. Further, the angle formed by the reflection surface of the light combining element 700b and the light beam 701b reflected by the light combining element 700b is also 35 degrees.
- the light beam 701b does not travel in the direction parallel to the X axis in FIG.
- the axis C2 shown in FIG. 7B corresponds to the X axis shown in FIG.
- the angle 35 degrees at which the light beam 701b enters the light combining element 700b corresponds to the angle A shown in FIG.
- the angle 35 degrees at which the light beam 701b is reflected by the light combining element 700b is an angle obtained by subtracting the reflection angle P3 from 90 degrees.
- the reflection angle P3 is defined as an angle between the traveling direction of the reflected light and the perpendicular of the boundary surface.
- the light ray 701b is incident on the light combining element 700b at an angle of 90 degrees with respect to the axis C2.
- the light ray 701b incident on the light combining element 700b is reflected at an angle of 20 degrees with respect to the axis C2.
- “20 degrees” shown here is a value obtained by subtracting an angle of 35 degrees reflected by the light combining element 700b from the inclination angle 55 degrees of the light combining element 700b with respect to the axis C2.
- the light beam 701b is not reflected in the direction parallel to the axis C2. Therefore, when the angle A is other than 45 degrees, the light emitted from the second excitation light source group 110B reflected by the light combining element 70 does not travel in the direction parallel to the X axis in FIG.
- the axis C2 is defined as follows. From the state where the light beam 701b is perpendicularly incident on the light combining element 700b, the light combining element 700b is rotated around the axis perpendicular to the light beam 701b (the rotation axis of the light combining element 700b). In this case, the axis C2 is a perpendicular to the plane including the light beam 701b and the rotation axis of the light combining element 700b.
- Axis C1 and C2 are orthogonal.
- the rotation axis is perpendicular to a plane including the axis C1 and the axis C2.
- the axis C2 shown in FIG. 7B corresponds to the X axis shown in FIG.
- the rotation axis corresponds to the Y axis shown in FIG.
- the photosynthetic element 700b is rotated 55 degrees around the rotation axis of the photosynthetic element 700b.
- the angle formed between the reflection surface of the light combining element 700b and the light beam 701b is 35 degrees.
- the bending mirror 71 is the same as the light combining element 70.
- the angle B is other than 45 degrees, the light beam reflected by the bending mirror 71 does not travel in the direction parallel to the Z axis.
- the bending mirror 71 does not change the angular relationship between the parallel light beam emitted from the first excitation light source unit 10a and the parallel light beam emitted from the second excitation light source unit 10b. This is because both are incident on the bending mirror 71 from the same direction (+ X axis direction) and reflected by the bending mirror 71.
- the angular relationship between the parallel light beam emitted from the first excitation light source unit 10a and the parallel light beam emitted from the second excitation light source unit 10b can be changed by changing the angle A. it can.
- the parallel light beam emitted from the first excitation light source unit 10a and the parallel light beam emitted from the second excitation light source unit 10b travel in parallel to the X axis.
- the parallel light beam emitted from the first excitation light source unit 10 a and the parallel light beam emitted from the second excitation light source unit 10 b are directed to the biconvex lens 101.
- the parallel light beam emitted from the first excitation light source unit 10a is parallel to the X axis.
- the parallel light beam emitted from the second excitation light source unit 10b has an angle with respect to the X axis. That is, the parallel light beam emitted from the second excitation light source unit 10b is inclined with respect to the X axis. That is, the parallel light beam emitted from the second excitation light source unit 10b is not parallel to the X axis.
- FIG. 7B when the light combining elements 70a and 70b shown in FIG. 5A or FIG. 5B are employed, a reflection region is formed on the surface of the light combining element 700b on the side where the light ray 701b is incident. 74 reflective surfaces are formed. For this reason, the reflective surface of the reflective region 74 and the transmissive surface of the transmissive region 75 are formed on the same surface.
- FIG. 8 is a diagram showing the result of a ray simulation showing the effect of the first embodiment.
- the first light beam group 720a is light emitted from the first excitation light source unit 10a.
- the second light group 720b is light emitted from the second excitation light source unit 10b.
- the first light beam group 720a is represented by a broken line.
- the second light beam group 720b is represented by a solid line.
- the light combining element 710 corresponds to the light combining element 70 shown in FIG. Further, the bending mirror 712 corresponds to the bending mirror 71 shown in FIG.
- the biconvex lens 711 corresponds to the biconvex lens 101 shown in FIG.
- the biconcave lens 713 corresponds to the biconcave lens 102 shown in FIG.
- the condenser lens 714 corresponds to the condenser lens group 400 shown in FIG.
- the condensing surface 715 corresponds to the phosphor element 40G shown in FIG.
- the first light beam group 720a travels in the ⁇ X axis direction.
- the first light ray group 720a traveling in the ⁇ X-axis direction is transmitted through the light combining element 710.
- the light beam group 720a that has passed through the light combining element 710 travels in the ⁇ X axis direction.
- the biconvex lens 711 is arranged in the ⁇ X axis direction of the light combining element 710.
- the first light beam group 720 a that has passed through the light combining element 710 passes through the biconvex lens 711.
- the first light beam group 720a transmitted through the biconvex lens 711 travels in the ⁇ X axis direction.
- the bending mirror 712 is arranged in the ⁇ X axis direction of the biconvex lens 711.
- the central light beam of the first light beam group 720a that has passed through the biconvex lens 711 is incident on the bending mirror 712 at an angle E.
- the angle E is an angle obtained by subtracting the incident angle P1 from 90 degrees.
- the central light beam of the first light beam group 720a that has passed through the biconvex lens 711 is parallel to the X axis. That is, the angle E indicates the angle that the bending mirror 712 rotates clockwise with respect to the XY plane as viewed from the + Y axis direction.
- the first light beam group 720a reflected by the bending mirror 712 travels in the ⁇ Z-axis direction.
- the biconcave lens 713 is disposed in the ⁇ Z axis direction of the bending mirror 712.
- the first light beam group 720 a reflected by the bending mirror 712 is incident on the biconcave lens 713.
- the first light beam group 720 a incident on the biconcave lens 713 becomes a parallel light beam by the biconcave lens 713.
- the first light beam group 720a that has become a parallel light beam travels in the ⁇ Z-axis direction.
- the condenser lens 714 is disposed in the ⁇ Z-axis direction of the biconcave lens 713.
- the first light beam group 720 a that has become a parallel light beam enters the condenser lens 714.
- the first light beam group 720a that has become a parallel light beam is condensed at a condensing position 715a of the condensing surface 715 by the condensing lens 714.
- the condensing surface 715 is located in the ⁇ Z-axis direction of the condensing lens 714.
- the condensing position 715a of the first light group 720a is located in the ⁇ X axis direction with respect to the optical axis C3.
- the optical axis C3 is the optical axis of the biconcave lens 713 and the condenser lens 714.
- the second light group 720b travels in the ⁇ Z-axis direction.
- the second light group 720b traveling in the ⁇ Z-axis direction is incident on the light combining element 710 at an angle D.
- the angle D is an angle obtained by subtracting the incident angle P1 from 90 degrees.
- the angle D corresponds to the angle A shown in FIG.
- angle D indicates the angle at which the photosynthetic element 710 rotates counterclockwise with respect to the YZ plane as viewed from the + Y-axis direction.
- the second light ray group 720b traveling in the ⁇ Z-axis direction is reflected by the light combining element 710.
- the second light beam group 720b reflected by the light combining element 710 travels in the ⁇ X axis direction.
- the biconvex lens 711 is arranged in the ⁇ X axis direction of the light combining element 710.
- the second light beam group 720 b reflected by the light combining element 710 proceeds toward the biconvex lens 711.
- the second light beam group 720 b reflected by the light combining element 710 passes through the biconvex lens 711.
- the second light ray group 720b that has passed through the biconvex lens 711 travels in the ⁇ X-axis direction.
- the bending mirror 712 is arranged in the ⁇ X axis direction of the biconvex lens 711.
- the central light beam of the second light beam group 720 b that has been transmitted through the biconvex lens 711 is incident on the bending mirror 712 at an angle larger than the angle E. That is, the central light beam of the second light beam group 720b that has passed through the biconvex lens 711 is incident at an angle larger than the angle E by an angle that is twice the value obtained by subtracting 45 degrees from the angle D.
- the second light beam group 720b that has passed through the biconvex lens 711 travels in the ⁇ X axis direction on the + Z-axis direction side of the first light beam group 720a that has passed through the biconvex lens 711.
- the central light beam of the second light beam group 720b is transmitted through the biconvex lens 711 at an angle different from the vertical direction, and therefore the angle is slightly different from the above description.
- the second light beam group 720 b reflected by the bending mirror 712 travels in the ⁇ Z axis direction.
- the biconcave lens 713 is disposed in the ⁇ Z axis direction of the bending mirror 712.
- the second light beam group 720 b reflected by the bending mirror 712 is incident on the biconcave lens 713.
- the second light beam group 720 b incident on the biconcave lens 713 becomes a parallel light beam by the biconcave lens 713.
- the second light beam group 720b that has become a parallel light beam travels in the ⁇ Z-axis direction.
- the condenser lens 714 is disposed in the ⁇ Z-axis direction of the biconcave lens 713.
- the second light beam group 720 b that has become a parallel light beam enters the condenser lens 714.
- the second light beam group 720 b that has become a parallel light beam is condensed at a condensing position 715 b on the condensing surface 715 by the condenser lens 714.
- the condensing surface 715 is located in the ⁇ Z-axis direction of the condensing lens 714.
- the condensing position 715b of the second light group 720b is located in the + X-axis direction with respect to the optical axis C3.
- the angle D is an angle larger than 45 degrees.
- the angle D is, for example, 45.8 degrees.
- the angle D shown in FIG. 8 corresponds to the angle A shown in FIG.
- the second light beam group 720b is reflected by the light combining element 710, and then tilts in the + Z-axis direction and proceeds in the ⁇ X-axis direction. That is, on the ⁇ X axis direction side with respect to the light combining element 710, the second light beam group 720b is located at a position shifted to the + Z axis direction side with respect to the first light beam group 720a.
- the angle E is an angle smaller than 45 degrees.
- the angle E is, for example, 44.5 degrees.
- the angle E shown in FIG. 8 corresponds to the angle B shown in FIG.
- the first light beam group 720a is reflected by the bending mirror 712, it is inclined in the ⁇ X axis direction with respect to the optical axis C3 and proceeds in the ⁇ Z axis direction.
- the second light group 720b is reflected by the bending mirror 712, and then proceeds in the ⁇ Z-axis direction on the + X-axis direction side of the first light group 720a.
- the second light beam group 720b is reflected by the bending mirror 712 and then proceeds in the ⁇ Z-axis direction with an inclination in the + X-axis direction with respect to the optical axis C3.
- the incident angle P1 of the second light beam group 720b with respect to the bending mirror 712 is smaller than the incident angle P1 of the first light beam group 720a.
- the incident angle P1 and the reflection angle P3 are equal from the law of light reflection. For this reason, the reflection angle P3 of the second light beam group 720b with respect to the bending mirror 712 is smaller than the reflection angle P3 of the first light beam group 720a.
- the condensing position 715a of the first light group 720a and the condensing position 715b of the second light group 720b are collected. Separation in the X-axis direction on the light surface 715 is possible. That is, the condensing position 715a of the first light ray group 720a and the condensing position 715b of the second light ray group 720b can be set to different positions on the surface of the condensing position 715.
- the angle D of the light combining element 710 is larger than the angle E of the bending mirror 712.
- the light can be condensed at different positions on the light condensing surface 715 around the optical axis C3, and the relationship between the angle E and the angle D is not particularly limited to the above example.
- the angle D The inclination with respect to 45 degrees is preferably larger than the inclination of angle E with respect to 45 degrees.
- an adjustment mechanism may be provided in the photosynthetic element 70 and the bending mirror 71 in FIG. Thereby, the tolerance (attachment variation) when attaching the photosynthetic element 70 and the bending mirror 71 can be corrected.
- the angle A of the light combining element 70 and the angle B of the bending mirror 71 may be adjusted using an adjustment tool or the like. By doing so, the adjustment mechanism becomes unnecessary, and the projection display device 1 can be made compact and low in cost.
- FIG. 9 is a diagram showing a schematic diagram of a spot image of excitation light on the phosphor element 40G.
- FIG. 9 is a view of the phosphor element 40G viewed from the + Z-axis direction.
- the light intensity distribution shown in FIG. 9 is represented by contour lines.
- the center of the spot image is indicated by a black circle.
- the contour lines show a distribution in which the light intensity is higher toward the center of the spot image. That is, the closer to the center of the spot image, the higher the light intensity.
- the phosphor screen of the phosphor element 40G corresponds to the condensing surface 715 shown in FIG.
- the optical axis C corresponds to the optical axis C3 shown in FIG.
- the light emitted from the first excitation light source unit 10a is condensed at the condensing position 400a.
- the condensing position 400a corresponds to the condensing position 715a shown in FIG.
- the condensing position 400a is located on the ⁇ X axis direction side of the optical axis C.
- the light emitted from the second excitation light source unit 10b is condensed at the condensing position 400b.
- the condensing position 400b corresponds to the condensing position 715b shown in FIG.
- the condensing position 400b is located on the + X axis direction side of the optical axis C.
- the condensed light has a light intensity distribution centered on the condensing positions 400a and 400b as shown in FIG.
- FIGS. 10 to 13 are diagrams showing examples of simulation results of spot images of excitation light on the phosphor element 40G. For convenience, a simulation is performed in the case where a light diffusing element is disposed between the biconcave lens 102 and the color separation filter 72 shown in FIG.
- FIGS. 10A and 10B show the light intensity distribution when the light emitted from the second excitation light source group 110B is condensed on the phosphor element 40G.
- 11A and 11B show the light intensity distribution when the light emitted from the first excitation light source group 110A is condensed on the phosphor element 40G.
- 12 (A) and 12 (B) show the case where the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B are condensed on the phosphor element 40G. The light intensity distribution is shown.
- FIGS. 10A and 10B show the light intensity distribution when the light emitted from the second excitation light source group 110B is condensed on the phosphor element 40G.
- 11A and 11B show the light intensity distribution when the light emitted from the first excitation light source group 110A is condensed on the phosphor element 40G.
- 12 (A) and 12 (B) show the case where the light emitted
- 13A and 13B show the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B when the configuration of the first embodiment is not adopted.
- the light intensity distribution at the time of condensing on the phosphor element 40G is shown.
- FIG. 10A, FIG. 11A, FIG. 12A, and FIG. 13A show the light intensity distribution on the surface (XY plane) of the phosphor element 40G. 10A, 11A, 12A, and 13A, the relative light intensity is divided into five stages.
- the five levels of light intensity are 0 to 0.2, 0.2 to 0.4, 0.4 to 0.6, 0.6 to 0.8, with the maximum light intensity being 1.
- the region with the higher light intensity is displayed with darker black. That is, the region closer to the center of the spot image has higher light intensity.
- the central area of the spot image is an area of 0.8 to 1.
- the outermost area of the spot image is an area from 0 to 0.2.
- the size in the X-axis direction of the surface of the phosphor element 40G in FIGS. 10 (A), 11 (A), 12 (A), and 13 (A) is a length 2a. That is, in FIGS. 10A, 11A, 12A, and 13A, the X axis is represented by ⁇ a to + a. 10A, 11A, 12A, and 13A, the horizontal axis is the Y axis and the vertical axis is the X axis. In FIGS. 10A, 11A, 12A, and 13A, the left side is the + Y-axis direction and the upper side is the + X-axis direction. 10A, 11A, 12A, and 13A, the optical axis C is represented by the origin (0, 0).
- 10B, FIG. 11B, FIG. 12B and FIG. 13B show the relative light intensity distribution on a line passing through the optical axis C of the phosphor element 40G and parallel to the X axis. Show.
- the horizontal axis represents the X axis
- the vertical axis represents the relative light intensity [%].
- 10B, FIG. 11B, FIG. 12B, and FIG. 13B the right side is the + X-axis direction.
- the value at the left end of the horizontal axis is ⁇ a
- the value at the right end of the horizontal axis is + a. 10B, FIG.
- FIG. 11B, FIG. 12B, and FIG. 13B indicate the relative light intensity obtained by normalizing the light intensity distribution on the X axis with the highest light intensity value.
- FIG. 10A shows the light intensity distribution of the light emitted from the second excitation light source group 110B.
- the brightest part of the light intensity distribution in FIG. 10A is located in a range where the value of X is a positive value. That is, the brightest portion of the light intensity distribution in FIG. 10A is located in the range where the value of X is from 0 to + a.
- the maximum value of the light intensity is around + 0.25a.
- FIG. 11A shows the light intensity distribution of the light emitted from the first excitation light source group 110A.
- the brightest portion of the light intensity distribution in FIG. 11A is located in a range where the value of X is negative. That is, the brightest portion of the light intensity distribution in FIG. 11A is located in the range where the value of X is from ⁇ a to 0.
- the maximum value of the light intensity is around -0.25a.
- the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B are in an axially symmetric position with respect to an axis passing through the optical axis C and parallel to the Y axis. It can be confirmed that the light is condensed.
- the light intensity distribution shown in FIG. 10A has an elliptical shape that is long in the X-axis direction.
- the light intensity distribution shown in FIG. 11A has an elliptical shape that is long in the Y-axis direction. The difference in the long side direction of the elliptical shape is caused by the polarization direction of the excitation light source.
- the light emitted by the first excitation light source group 110A is P-polarized light.
- the polarization direction of the P-polarized light when emitted from the first excitation light source group 110A is a direction parallel to the Z axis.
- the light emitted from the first excitation light source group 110A has a long illuminance distribution in the Y-axis direction when transmitted through the collimating lens group 115A.
- the light emitted from the second excitation light source group 110B is S-polarized light.
- the polarization direction of the S-polarized light when emitted from the second excitation light source group 110B is parallel to the Y axis.
- the light emitted from the second excitation light source group 110B has a long illuminance distribution in the X-axis direction when transmitted through the collimating lens group 115B.
- the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B are synthesized using polarized light.
- polarized light for example, when combining with a striped mirror or the like, since it does not depend on polarization, it is possible to change the direction of the long side of the elliptical illuminance distribution.
- FIG. 12 (A) shows the light intensity distribution of the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B. There are two brightest portions of the light intensity distribution in FIG.
- the brightest part of the light intensity distribution in FIG. 12A is one on the + X axis direction side and one on the ⁇ X axis direction side.
- the center of the light intensity distribution of the light emitted from the first excitation light source group 110A is the brightest portion of the light intensity distribution on the ⁇ X axis direction side.
- the center of the light intensity distribution of the light emitted from the second excitation light source group 110B is the brightest part of the light intensity distribution on the + X axis direction side.
- the brightest part of the light intensity distribution on the + X-axis direction side and the brightest part of the light intensity distribution on the ⁇ X-axis direction side are in symmetrical positions with the optical axis C as the center. That is, as described above, the brightest part of the two light intensity distributions is an axisymmetric position with respect to an axis passing through the optical axis C and parallel to the Y axis.
- the peak position of the light intensity is divided into two locations, but it can be confirmed that the region centered on the optical axis C has a uniform light intensity.
- the region centered on the optical axis C is a range where the value of X is from ⁇ 0.25a to + 0.25a. That is, in FIG. 12B, the light intensity is uniform in the range where the value of X is from ⁇ 0.25a to + 0.25a.
- FIG. 13A shows the light intensity distribution when the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B are condensed at one place. That is, the case where the angle A and the angle B are 45 degrees is shown. The brightest part of the light intensity distribution in FIG. 13A exists on the optical axis C.
- a curve D1 indicates the light intensity value on the X axis of the light intensity distribution shown in FIG. That is, the curve D1 represents the light intensity shown in FIG.
- a curve D2 indicates the light intensity value on the X axis of the light intensity distribution shown in FIG.
- the vertical axis of FIG. 13B shows the relative light intensity normalized with the highest light intensity value of the intensity distribution on the X axis of the curve D2.
- the curve D2 has a triangular shape.
- the maximum value of the relative light intensity of the curve D1 is 50% of the maximum value of the relative light intensity of the curve D2.
- the maximum value of the light intensity of the curve D1 is halved with respect to the maximum value of the light intensity of the curve D2. That is, the local light intensity of the curve D1 is halved relative to the local light intensity of the curve D2.
- the curve D2 has a trapezoidal shape.
- the light having the characteristic of the relative light intensity of the curve D1 can suppress the local light saturation of the phosphor element 40G. Further, the light having the characteristic of the relative light intensity of the curve D1 improves the conversion efficiency of the phosphor element 40G. Further, the light having the characteristic of the relative light intensity of the curve D1 can extend the life of the phosphor element 40G.
- suppression of local light saturation of the phosphor element 40G can be realized by a simple configuration in which the photosynthetic element 70 and the bending mirror 71 are rotated and arranged. As described above, the ease of assembly can be improved and the cost can be reduced by adopting a simple configuration.
- the light source device 2 includes a red light source unit 30R.
- the red light source unit 30R includes a red light source group 310R that emits light in the red wavelength region.
- the red light source unit 30R includes a collimating lens group 315R.
- the red light source group 310R includes a plurality of red light sources 311, 312, 313, 321, 322, 323, 331, 332, 333.
- the center wavelength of the red wavelength region is, for example, 640 nm.
- FIG. 14 is an example of a configuration diagram showing an arrangement configuration of the red light source unit 30R.
- the red light source unit 30R includes a red light source group 310R and a collimating lens group 315R.
- the red light source group 310R includes red light sources 311, 312, 313, 321, 322, 323, 331, 332, 333.
- the red light sources 311, 312, 313, 321, 322, 323, 331, 332, and 333 are arranged on the XY plane.
- the red light sources 311, 312, 313, 321, 322, 323, 331, 332, 333 are arranged in a matrix on the XY plane.
- the collimating lens group 315R includes collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, and 336.
- the collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, and 336 are arranged on the XY plane.
- the collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, and 336 are arranged in a matrix on the XY plane.
- the collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, and 336 are arranged in the + Z-axis direction of the red light sources 311, 312, 313, 321, 322, 323, 331, 332, and 333. ing.
- the collimating lens 314 is disposed in the + Z axis direction of the red light source 311.
- the red light source 311 is represented by a broken line.
- the collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, 336 are arranged at corresponding positions of the red light sources 311, 312, 313, 321, 322, 323, 331, 332, 333. .
- the “corresponding position” means that light emitted from the red light sources 311, 312, 313, 321, 322, 323, 331, 332, 333 is parallelized lenses 314, 315, 316, 324, 325, 326, 334. , 335, 336.
- the collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, and 336 collimate the light beams emitted from the red light sources 311, 312, 313, 321, 322, 323, 331, 332, and 333.
- the collimating lens 314 collimates the light beam emitted from the red light source 311.
- the collimating lenses 314, 315, 316, 324, 325, 326, 334, 335 and 336 radiate the collimated light beams in the direction of the lens group 300.
- the direction of the lens group 300 is the + Z-axis direction.
- the red light sources 311, 312, 313, 321, 322, 323, 331, 332, 333 are laser light sources.
- Red light emitted from the red light source group 310R travels in the + Z-axis direction.
- a collimating lens group 315R is arranged in the + Z-axis direction of the red light source group 310R.
- the collimating lens group 315R includes a plurality of collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, and 336.
- the red light emitted from the red light source group 310R is converted into a parallel light beam by the collimating lens group 315R.
- red light emitted from the red light source 311 is converted into a parallel light beam by the parallelizing lens 314.
- the parallel light flux converted by the collimating lens group 315R travels in the + Z-axis direction.
- the parallel light flux converted by the collimating lens 314 travels in the + Z axis direction.
- the lens group 300 is arranged in the + Z-axis direction of the collimating lens group 315R.
- the lens group 300 includes a convex lens 301 and a concave lens 302, for example.
- the lens group 300 has the same characteristics as the biconvex lens 101 and the biconcave lens 102 described above. That is, the bundle of parallel light beams (total light beam) emitted from the collimating lens group 315R is converted into a parallel light beam (total light beam) in which the diameter of the total light beam is reduced by the lens group 300.
- the red light beam emitted from the convex lens 301 and the concave lens 302 travels in the + Z-axis direction.
- the color separation filter 73 is arranged in the + Z axis direction of the lens group 300.
- the red light beam emitted from the lens group 300 reaches the color separation filter 73.
- the red light beam emitted from the lens group 300 passes through the color separation filter 73.
- the red light beam that has passed through the color separation filter 73 travels in the + Z-axis direction.
- the condensing optical system 80 is disposed in the + Z-axis direction of the color separation filter 73.
- the red light beam that has passed through the color separation filter 73 reaches the condensing optical system 80.
- the red light beam that has passed through the color separation filter 73 passes through the condensing optical system 80.
- the red light beam that has passed through the color separation filter 73 is condensed on the incident end face 113 i of the light intensity uniformizing element 113 by the condensing optical system 80.
- the light beam emitted from the collimating lens group 315R has a light intensity as long as the condensing optical system 80 has a size capable of entering all the light beams emitted from the collimating lens group 315R.
- the light is condensed on the incident end face 113 i of the uniformizing element 113. That is, the condensing optical system 80 receives a plurality of light beams (total light beams) emitted from the collimating lens group 315R and guides them to the light intensity uniformizing element 113.
- the condensing optical system 80 receives the light beam emitted from the collimating lens 314 and guides it to the light intensity uniformizing element 113.
- the red light beam enters the light intensity uniformizing element 113 from the incident end face 113i.
- the light intensity distribution of the red light beam incident on the light intensity uniformizing element 113 is made uniform. Then, the uniformed red luminous flux is emitted from the emission end face 113o.
- the red light beam emitted from the emission end face 113o enters the light valve 121 through the relay lens group 115, the bending mirror 120, and the condenser lens 122, similarly to the green light beam.
- the light intensity uniformizing element 113 enters a plurality of condensed light fluxes from the incident end face 113i and emits them as light fluxes having a uniform light intensity distribution.
- the light valve 121 receives a uniform light beam and emits it as modulated light.
- the light valve 121 converts the incident uniform light beam into modulated light and emits it.
- the light source device 2 includes a blue light source unit 20B.
- the blue light source unit 20B includes a blue light source group 210B that emits light in a blue wavelength region.
- the blue light source unit 20B includes a collimating lens group 215B.
- the blue light source group 210 ⁇ / b> B includes a plurality of blue light sources 211, 212, 213, 221, 222, 223, 231, 232, and 233.
- the center wavelength of the blue wavelength region is, for example, 460 nm.
- FIG. 15 is an example of a configuration diagram showing an arrangement configuration of the blue light source unit 20B.
- the blue light source unit 20B includes a blue light source group 210B and a collimating lens group 215B.
- the blue light source group 210 ⁇ / b> B includes blue light sources 211, 212, 213, 221, 222, 223, 231, 232, and 233.
- Blue light sources 211, 212, 213, 221, 222, 223, 231, 232, 233 are arranged on the YZ plane.
- the blue light sources 211, 212, 213, 221, 222, 223, 231, 232, 233 are arranged in a matrix on the YZ plane.
- the collimating lens group 215B includes collimating lenses 214, 215, 216, 224, 225, 226, 234, 235, and 236.
- the collimating lenses 214, 215, 216, 224, 225, 226, 234, 235 and 236 are arranged on the YZ plane.
- the parallelizing lenses 214, 215, 216, 224, 225, 226, 234, 235, and 236 are arranged in a matrix on the YZ plane.
- the collimating lenses 214, 215, 216, 224, 225, 226, 234, 235, 236 are arranged in the ⁇ X axis direction of the blue light sources 211, 212, 213, 221, 222, 223, 231, 232, 233.
- the collimating lens 214 is disposed in the ⁇ X axis direction of the blue light source 211.
- the blue light source 211 is represented by a broken line.
- the collimating lenses 214, 215, 216, 224, 225, 226, 234, 235, 236 are arranged at corresponding positions of the blue light sources 211, 212, 213, 221, 222, 223, 231, 232, 233. .
- the “corresponding position” means that light emitted from the blue light sources 211, 212, 213, 221, 222, 223, 231, 232, 233 is parallelized lenses 214, 215, 216, 224, 225, 226, 234. , 235, 236.
- the collimating lenses 214, 215, 216, 224, 225, 226, 234, 235, and 236 collimate the light beams emitted from the blue light sources 211, 212, 213, 221, 222, 223, 231, 232, and 233.
- the collimating lens 214 collimates the light beam emitted from the blue light source 211.
- the collimating lenses 214, 215, 216, 224, 225, 226, 234, 235 and 236 radiate the collimated light beams in the direction of the lens group 200.
- the direction of the lens group 200 is the ⁇ X axis direction.
- the blue light sources 211, 212, 213, 221, 222, 223, 231, 232, 233 are laser light sources.
- Blue light emitted from the blue light source group 210B travels in the ⁇ X axis direction.
- a collimating lens group 215B is arranged in the ⁇ X-axis direction of the blue light source group 210B.
- the collimating lens group 215B includes a plurality of collimating lenses 214, 215, 216, 224, 225, 226, 234, 235, and 236.
- Blue light emitted from the blue light source group 210B is converted into a parallel light beam by the collimating lens group 215B.
- blue light emitted from the blue light source 211 is converted into a parallel light beam by the parallelizing lens 214.
- the parallel light flux converted by the collimating lens group 215B travels in the ⁇ X axis direction.
- the parallel light flux converted by the collimating lens 214 travels in the ⁇ X axis direction.
- the lens group 200 is arranged in the -X-axis direction of the collimating lens group 215B.
- the lens group 200 includes a convex lens 201 and a concave lens 202, for example.
- the lens group 200 has the same characteristics as the biconvex lens 101 and the biconcave lens 102 described above. That is, the bundle of parallel light beams (total light beam) emitted from the collimating lens group 215B is converted into a parallel light beam (total light beam) in which the diameter of the total light beam is reduced by the lens group 200.
- the blue luminous flux emitted from the convex lens 201 and the concave lens 202 travels in the ⁇ X axis direction.
- the color separation filter 72 is arranged in the ⁇ X axis direction of the lens group 200.
- the blue light beam emitted from the lens group 200 reaches the color separation filter 72.
- the blue light beam emitted from the lens group 200 passes through the color separation filter 72.
- the blue light beam transmitted through the color separation filter 72 travels in the ⁇ X axis direction.
- the color separation filter 73 is arranged in the ⁇ X axis direction of the color separation filter 72.
- the blue light beam that has passed through the color separation filter 72 reaches the color separation filter 73. Then, the blue light beam transmitted through the color separation filter 72 is reflected by the color separation filter 73.
- the blue light beam reflected by the color separation filter 73 travels in the + Z-axis direction.
- the blue light beam transmitted through the color separation filter 72 is reflected by the color separation filter 73 in the + Z-axis direction.
- the condensing optical system 80 is disposed in the + Z-axis direction of the color separation filter 73.
- the blue light beam reflected by the color separation filter 73 reaches the condensing optical system 80. Then, the blue light beam reflected by the color separation filter 73 passes through the condensing optical system 80.
- the blue light beam reflected by the color separation filter 73 is condensed on the incident end face 113 i of the light intensity uniformizing element 113 by the condensing optical system 80.
- the light beam emitted from the collimating lens group 215B has a light intensity as long as the condensing optical system 80 is large enough to receive the total light beam emitted from the collimating lens group 215B.
- the light is condensed on the incident end face 113 i of the uniformizing element 113. That is, the condensing optical system 80 receives a plurality of light beams (total light beams) emitted from the collimating lens group 215B and guides them to the light intensity uniformizing element 113.
- the condensing optical system 80 receives the light beam emitted from the collimating lens 214 and guides it to the light intensity uniformizing element 113.
- the blue light beam enters the light intensity uniformizing element 113 from the incident end face 113i.
- the light intensity distribution of the blue light beam incident on the light intensity uniformizing element 113 is made uniform. Then, the uniformed blue light beam is emitted from the emission end face 113o.
- the blue light beam emitted from the emission end face 113o enters the light valve 121 through the relay lens group 115, the bending mirror 120, and the condenser lens 122 in the same manner as the green light beam and the red light beam.
- the light intensity uniformizing element 113 enters a plurality of condensed light fluxes from the incident end face 113i and emits them as light fluxes having a uniform light intensity distribution.
- the light valve 121 receives a uniform light beam and emits it as modulated light.
- the light valve 121 converts the incident uniform light beam into modulated light and emits it.
- the center wavelength of the light emitted from the blue light source group 210B is 10 nm or longer than the center wavelength of the light emitted from the first excitation light source group 110A and the center wavelength of the light emitted from the second excitation light source group 110B.
- FIG. 16 is a schematic diagram schematically showing a part of the configuration of the projection display device 1 when viewed from the front side. “View from the front side” means to see the + X-axis direction from the ⁇ X-axis direction side.
- FIG. 16 for convenience of explanation, the optical element subsequent to the light intensity uniformizing element 113 is illustrated.
- the “second stage” is a direction in which light travels. That is, FIG. 16 illustrates components that transmit or reflect light emitted from the light intensity equalizing element 113.
- the light beam reflected by the bending mirror 120 passes through the condenser lens 122.
- the light beam that has passed through the condenser lens 122 enters the light valve 121.
- the light valve 121 spatially modulates incident light according to the modulation control signal MC as described above.
- the light valve 121 converts incident light into modulated light and outputs the modulated light.
- the projection optical system 124 receives the modulated light emitted from the light modulation surface (light emission surface) of the light valve 121.
- the projection optical system 124 magnifies and projects the incident modulated light on the projection surface 150.
- Modulated light is projected onto the projection surface 150.
- An optical image is displayed on the projection surface 150.
- the projection surface 150 is, for example, an external screen.
- the optical axis OA of the projection optical system 124 is shifted by a distance d in the + Y-axis direction with respect to the central axis CA of the light exit surface (light modulation surface) of the light valve 121. That is, the distance d is a distance in the normal direction (Y-axis direction) with respect to the ZX plane from the optical axis OA of the projection optical system 124 to the central axis CA of the light emission surface (light modulation surface) of the light valve 121.
- the “+ Y axis direction” is the height direction of the projection display device 1.
- optical axis OA and the central axis CA are axes perpendicular to the YZ plane. For this reason, in FIG. 16, the optical axis OA and the central axis CA are indicated by black circles.
- the light valve 121 Since the light valve 121 is located in the + X axis direction of the projection optical system 124, a part of the light valve 121 is indicated by a broken line.
- the condensing lens 122 has a shape in which a part thereof is cut out.
- “interference” means that components are in contact with each other. In FIG. 16, the upper left side is cut away so as to avoid the cylindrical projection optical system 124.
- FIG. 17 is a schematic diagram for explaining the relationship between the projection optical system 124 and the projection surface 150.
- the center position of the projection surface 150 is shifted by a distance of d ⁇ M in the + Y axis direction with respect to the optical axis OA of the projection optical system 124.
- the distance d is the distance in the Y-axis direction from the central axis CA of the light valve 121 to the optical axis OA of the projection optical system 124.
- the enlargement magnification M is an enlargement magnification of the projection optical system 124.
- the central axis CA of the light valve 121 does not coincide with the optical axis OA of the projection lens.
- the optical axis OA is an axis perpendicular to the YZ plane. For this reason, in FIG. 17, the optical axis OA is indicated by a black circle. Further, “projection surface 150” shown in FIG. 17 indicates a position where an image on the projection surface 150 such as a screen is projected.
- the projection light Ro emitted from the projection display device 1 reaches the projection surface 150.
- the projection display apparatus 1 can be rotated 180 degrees around the X axis. That's fine. Then, the center of the projection surface 150 can be moved in the ⁇ Y axis direction of FIG.
- the projection optical system 124 is not at the center of the projection display device 1 in the Z-axis direction, it is necessary to move the projection display device 1 in the Z-axis direction.
- FIG. 18 shows a schematic diagram of the light intensity distribution of the light beam condensed on the light intensity equalizing element 113.
- FIG. 18 is a schematic diagram showing a light intensity distribution on the incident end face 113 i of the light intensity equalizing element 113.
- the light intensity distribution shown in FIG. 18 is schematically represented by contour lines.
- the center of the spot image is indicated by a black circle.
- the contour lines show a distribution in which the light intensity is higher toward the center of the spot image. That is, the closer to the center of the spot image, the higher the light intensity.
- FIG. 18 is a view of the incident end face 113i of the light intensity equalizing element 113 as seen from the ⁇ Z-axis direction.
- the light intensity uniformizing element 113 is arranged to be inclined with respect to the X axis and the Y axis.
- the light intensity equalizing element 113 is arranged to rotate around the optical axis C.
- the short side of the incident end face 113i rotates clockwise from a position parallel to the Y axis.
- the light flux emitted from the first excitation light source group 110A is condensed on the ⁇ X axis direction side with respect to the optical axis C on the phosphor element 40G.
- the light beam emitted from the first excitation light source group 110A is condensed at the condensing position 400a. Therefore, the position of the maximum light intensity of the light flux emitted from the first excitation light source group 110A is on the ⁇ X axis direction side with respect to the optical axis C.
- the light beam emitted from the second excitation light source group 110B is condensed on the + X axis direction side with respect to the optical axis C on the phosphor element 40G.
- the light beam emitted from the second excitation light source group 110B is condensed at the condensing position 400b. Therefore, the position of the maximum light intensity of the light flux emitted from the second excitation light source group 110B is on the + X axis direction side with respect to the optical axis C.
- a light beam having the center of the light intensity distribution at the condensing position 400a is emitted from the phosphor element 40G.
- the light beam having the center of the light intensity distribution at the condensing position 400 a is collimated by the condensing lens group 400.
- the collimated light beam is condensed on the incident end face 113 i of the light intensity uniformizing element 113 by the condensing optical system 80.
- the condensing position of the collimated light flux on the incident end face 113i is on the + X axis direction side with respect to the optical axis C.
- the light beam having the center of the light intensity distribution at the condensing position 400a is condensed at the condensing position 113a on the incident end face 113i.
- the condensing position 113a is on the + X axis direction side with respect to the optical axis C.
- a light beam having the center of the light intensity distribution at the condensing position 400b is emitted from the phosphor element 40G.
- the light beam having the center of the light intensity distribution at the condensing position 400 b is collimated by the condensing lens group 400.
- the collimated light beam is condensed on the incident end face 113 i of the light intensity uniformizing element 113 by the condensing optical system 80.
- the condensing position of the collimated light beam on the incident end face 113i is on the ⁇ X axis direction side with respect to the optical axis C.
- the light beam having the center of the light intensity distribution at the condensing position 400b is condensed at the condensing position 113b on the incident end face 113i.
- the condensing position 113b is on the ⁇ X axis direction side with respect to the optical axis C.
- the light beam incident on the light valve 121 is incident on the light valve 121 obliquely from the bottom because of its method of use. Therefore, in order to optically match the direction of the long side of the emission end face 113o of the light intensity uniformizing element 113 with the direction of the long side of the light valve 121, the light intensity uniformizing element 113 is centered on the optical axis C. Rotate and place. Then, the rotation of the light beam with respect to the optical axis C center is corrected by the bending mirror 120.
- the optical axis C is an axis perpendicular to the XY plane. For this reason, in FIG. 18, the optical axis C is indicated by a black circle.
- the angle A shown in FIG. 1 is set larger than 45 degrees
- the angle B is set smaller than 45 degrees.
- the light emitted from the first excitation light source group 110A is condensed in the ⁇ X axis direction with respect to the optical axis C on the phosphor element 40G.
- the light emitted from the second excitation light source group 110B is condensed in the + X-axis direction with respect to the optical axis C on the phosphor element 40G.
- the light combining element 710 in FIG. 8 corresponds to the light combining element 70 in FIG.
- the bending mirror 712 in FIG. 8 corresponds to the bending mirror 71 in FIG.
- the light emitted from the first excitation light source group 110A is condensed in the + X-axis direction with respect to the optical axis C on the phosphor element 40G.
- the light emitted from the second excitation light source group 110B is condensed in the ⁇ X axis direction with respect to the optical axis C on the phosphor element 40G.
- the angle A shown in FIG. 1 corresponds to the angle D shown in FIG.
- the angle B shown in FIG. 1 corresponds to the angle E shown in FIG.
- the central light intensity range is narrowed for convenience.
- a light diffusing element between the color separation filter 72 and the biconcave lens 102, it is possible to widen the central light intensity range and smooth the intensity distribution.
- the simulation results are shown by arranging a light diffusing element between the color separation filter 72 and the biconcave lens 102.
- the light diffusing element When the light diffusing element is not arranged, the diameter of the light beam becomes small, and the effect of smoothing the intensity distribution becomes difficult to obtain. However, even in the case where the light diffusing element is not used, in the first embodiment, the light intensity can be divided into two, so that the effect of improving the conversion efficiency and extending the life of the phosphor can be obtained.
- the phosphor element 40G and the incident end face 113i of the light intensity uniformizing element 113 are in a conjugate relationship. Accordingly, the light intensity distribution on the phosphor element 40G becomes the light intensity distribution on the incident end face 113i of the light intensity uniformizing element 113. That is, the shape of the light intensity distribution on the phosphor element 40G shown in FIG. 9 is similar to the shape of the light intensity distribution on the incident end face 113i shown in FIG.
- the phosphor element 40G is converted into a green luminous flux as a completely diffused luminous flux, and the condenser lens group 400 Radiated towards
- the phosphor element 40G is converted into a green luminous flux as a completely diffused luminous flux, and the condenser lens group 400 Radiated towards
- the relationship of the following formula (1) exists between the emission angle S1 of the light source and the emission area SA.
- the light source here is the phosphor of the phosphor element 40G. That is, the radiation angle of the converted green light corresponds to the emission angle S1. Further, the spot diameter of the excitation light on the phosphor element 40G corresponds to the emission area SA.
- SA ⁇ (sin (S1)) 2 constant (1)
- the divergence angle (outgoing angle S1) of the light beam emitted from the phosphor element 40G is set to 80 degrees, and the effective incident angle of the light intensity uniformizing element 113 is set to 30 degrees.
- the area of the light beam incident on the incident end face 113i of the light intensity uniformizing element 113 is about four times the area of the spot of the excitation light on the phosphor element 40G. Therefore, it is possible to determine the optimum position and size (spot diameter) of the light beam focused on the phosphor element 40G from the area of the light beam incident on the incident end face 113i of the light intensity uniformizing element 113.
- the divergence angle (80 degrees) of the light beam emitted from the phosphor element 40G and the effective incident angle (30 degrees) of the light intensity uniformizing element 113 have the relationship of the following equation (2). (Sin (80)) 2 ⁇ 4 ⁇ (sin (30)) 2 (2)
- the emission area SA of the light source is equivalent to the spot diameter area of the excitation light.
- the emission area SA of the light source is an area where the phosphor emits fluorescence.
- the area and effective incident angle of the light beam incident on the incident end face 113i of the light intensity equalizing element 113 are determined by the area and effective incident angle of the light beam incident on the light valve 121. This is also calculated using equation (1).
- the expression (1) can be applied.
- the light intensity uniformizing element 113 is inclined with respect to the X axis and the Y axis. For this reason, the luminous flux from the phosphor element 40G is not efficiently captured. However, the light beam at the front stage of the light intensity uniformizing element 113 may be rotated about the center C of the light intensity uniformizing element 113 as an axis center to eliminate the inclination with respect to the X axis and the Y axis.
- the inclination of light emitted from the light intensity uniformizing element 113 may be eliminated by devising an optical system subsequent to the light intensity uniformizing element 113.
- an optical system subsequent to the light intensity uniformizing element 113 For example, by using an illumination optical system using a total reflection prism, it is possible to eliminate the inclination of the light intensity uniformizing element 113.
- the rotation directions of the light combining element 70 and the bending mirror 71 are rotated so that two light beams emitted from the light source (phosphor element 40G) are formed in the long side direction of the incident end face 113i of the light intensity uniformizing element 113. It is necessary to let That is, the condensing position 113a and the condensing position 113b need to be arranged in the long side direction of the incident end face 113i. Therefore, it is necessary to devise the arrangement of the first excitation light source unit 10a and the second excitation light source unit 10b.
- local light intensity distribution means that the energy density is locally increased. Then, local light saturation of the phosphor element 40G can be reduced. And the conversion efficiency of the phosphor element 40G is increased.
- the local light intensity distribution on the phosphor element 40G can be reduced by rotating the photosynthetic element 70 and the folding mirror 71. That is, it is not necessary to add an optical element, and the size of the apparatus can be reduced, the assemblability can be improved, or the cost can be reduced by suppressing the increase in the number of parts.
- the two light beams emitted from the light source can be incident on the incident end face 113i of the light intensity uniformizing element 113.
- the light beam advances in the order of the light combining element 70, the biconvex lens 101, the bending mirror 71, and the biconcave lens 102.
- the light beam may proceed in the order of the light combining element 70, the bending mirror 71, the biconvex lens 101, and the biconcave lens 102.
- the light combining element 70 and the bending mirror 71 may be rotated in the same direction around the Y axis.
- the biconvex lens 101 and the biconcave lens 102 are arranged to reduce the beam diameter.
- the biconvex lens 101 and the biconcave lens 102 can be deleted. That is, the same effect can be obtained even if the biconvex lens 101 and the biconcave lens 102 are deleted.
- lens groups 200 and 300 can also be deleted.
- the light source device 2 includes the photosynthetic element 70 and the phosphor element 40G.
- the photosynthetic element 70 transmits the first excitation light and reflects the second excitation light.
- the phosphor element 40G emits fluorescence upon receiving the first excitation light and the second excitation light.
- the first excitation light transmitted through the light combining element 70 is a phosphor element.
- the position 400a reaching 40G is different from the position 400b where the second excitation light reflected by the light combining element 70 reaches the phosphor element 40G.
- the first excitation light is light emitted from the first excitation light source group 110A.
- the second excitation light is light emitted from the second excitation light source group 110B.
- the first light source 110A has been described as having a plurality of light sources as the “first excitation light source group”. However, an example in which a plurality of light sources are used to increase the amount of light is shown, and in the case of a light source having a high amount of light, it is not necessary to be a “light source group”.
- two light sources have been described.
- the light source device 2 includes a first light source 110A and a second light source 110B.
- the first excitation light is emitted from the first light source 110A
- the second excitation light is emitted from the second light source 110B.
- the first light source 110A is described as the first excitation light source group 110A.
- the second light source 110B is described as the second excitation light source group 110B.
- the light synthesizing element 70 includes a transmission region 75 that transmits the first excitation light and a reflection surface of the reflection region 74 that reflects the second excitation light.
- the reflection area 74 is an area different from the transmission area 75.
- the transmission area 75 has a transmission surface.
- the transmission surface is located on the same surface as the reflection surface of the reflection region 74.
- the transmission region 75 is formed by a hole provided in the photosynthetic element 70.
- the reflection surface of the photosynthetic element 70 includes a normal line of a surface including the central ray of the first excitation light beam and the central ray of the second excitation light beam, and is arranged by rotating the normal line as a rotation axis. Has been.
- the transmission surface of the photosynthetic element 70 includes a normal line of a surface including the central ray of the first excitation light beam and the central ray of the second excitation light beam, and is arranged by rotating the normal line as a rotation axis. Has been.
- the angle formed by the central ray of the first excitation light beam incident on the light combining element 70 and the central ray of the second excitation light beam incident on the light combining element 70 is 90 degrees.
- the reflection surface of the light combining element 70 when the reflection surface of the light combining element 70 is located on the emission side of the first excitation light, the reflection surface of the light combining element 70 has an emission angle of the first excitation light of 45 with respect to the reflection surface of the light combining element 70. From the position which becomes a degree, it arrange
- the transmission surface of the light combining element 70 has an emission angle of the first excitation light of 45 with respect to the transmission surface of the light combining element 70. From the position which becomes a degree, it arrange
- the light combining element 70 is arranged so as to rotate about the normal line of the surface including the central ray of the first excitation light beam and the central ray of the second excitation light beam as the rotation axis.
- the light source device 2 includes a bending mirror 71.
- the bending mirror 71 reflects the first excitation light transmitted through the light combining element 70 and the second excitation light reflected by the light combining element 70.
- the reflecting surface of the bending mirror 71 has a plane normal line including the central ray of the first excitation light beam incident on the bending mirror 71 and the central ray of the first excitation light beam reflected by the bending mirror 71. Including this normal and rotating around the axis of rotation.
- the reflecting surface of the bending mirror 71 is the central ray of the first excitation light beam incident on the bending mirror 71 from the position where the incident angle of the central ray of the first excitation light with respect to the reflecting surface of the bending mirror 71 is 45 degrees. And a plane normal line including the central ray of the light beam of the first excitation light reflected by the bending mirror 71 is rotated around the rotation axis.
- the light source device 2 includes a collimating lens 115A that converts the first excitation light emitted from the first light source 110A into a parallel light flux.
- the light source device 2 also includes a collimating lens 115B that converts the second excitation light emitted from the second light source 110B into a parallel light flux.
- FIG. FIG. 19 is a configuration diagram schematically showing the main configuration of the light source device 1001 according to the second embodiment of the present invention.
- the second embodiment is different from the first embodiment in that the rotary phosphor elements 41G and 42G, the collimating lens group 501, and the condenser lens group 502 are provided.
- Constituent elements similar to those of the projection display device 1 described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the same components as those in the first embodiment are the first excitation light source unit 10a, the second excitation light source unit 10b, the light combining element 70, the biconvex lens 101, the biconcave lens 102, the bending mirror 71, the color separation filter 72, and the color separation filter. 73, a condensing lens group 400 (convex lens 401 and aspherical convex lens 402), blue light source unit 20B, red light source unit 30R, and lens groups 200 and 300.
- the condensing optical system 80 and the light intensity uniformizing element 113 are the same as those of the projection display apparatus 1 of the first embodiment.
- constituent elements subsequent to the light intensity uniformizing element 113 are the same as those of the projection display apparatus 1 of the first embodiment. That is, the same constituent elements as those in the first embodiment are the relay lens group 115 (concave lens (meniscus lens) 116, convex lens 117 and biconvex lens 118), bending mirror 120, condenser lens 122, light valve 121, and projection optical system 124. And a control unit 3.
- the light source device 2, 1001 includes a biconvex lens 101 and a biconcave lens 102 as an afocal optical system.
- the condensing lens group 400 of the light source devices 2 and 1001 includes a convex lens 401 and an aspherical convex lens 402.
- the relay lens group 115 of the light source devices 2 and 1001 includes a concave / convex lens (meniscus lens) 116, a convex lens 117, and a biconvex lens 118.
- FIG. 20 is a schematic view of the rotary phosphor element 41G observed from the + Z-axis direction.
- FIG. 21 is a schematic view of the rotary phosphor element 42G observed from the + Z-axis direction.
- FIG. 22 is a schematic view of another example of the rotary phosphor element 41G observed from the + Z-axis direction.
- the rotary phosphor element 41G has, for example, a disk shape in FIG. And the fluorescent substance is apply
- the rotary phosphor element 41G is not limited to a disk shape.
- the region 41Ga of the rotary phosphor element 41G is a region where a phosphor is applied.
- the peripheral part of a disc is an area
- the region 41Gb of the rotary phosphor element 41G is a region that transmits light (transmission region). That is, the light beam incident on the region 41Gb passes through the region 41Gb.
- the right half (+ X axis direction side) of the peripheral edge of the rotary phosphor element 41G is a region 41Ga.
- the left half ( ⁇ X axis direction side) of the peripheral edge of the rotary phosphor element 41G is a region 41Gb.
- the peripheral portion of the rotary phosphor element 41G is divided into four in the circumferential direction, and the regions 41Ga and the regions 41Gb are alternately arranged.
- the right side (+ X axis direction side) and the left side ( ⁇ X axis direction side) of the peripheral portion of the rotary phosphor element 41G are regions 41Ga.
- the upper side (+ Y axis direction side) and the lower side ( ⁇ Y axis direction side) of the peripheral edge of the rotary phosphor element 41G are regions 41Gb.
- the rotating phosphor element 42G has, for example, a disk shape in FIG. And the fluorescent substance is apply
- the rotary phosphor element 42G is not limited to the disk shape.
- the region 42Ga of the rotary phosphor element 42G is a region where a phosphor is applied.
- the peripheral part of a disc is an area
- a bending mirror 71 is disposed between the biconvex lens 101 and the biconcave lens 102.
- the traveling direction of the light beam traveling in the ⁇ X-axis direction from the biconvex lens 101 is changed to the ⁇ Z-axis direction by the bending mirror 71.
- the light beam incident on the condenser lens group 400 is condensed on the rotating phosphor element 41G by the condenser lens group 400.
- the light beam focused on the region 41Ga of the rotary phosphor element 41G is converted into a green light beam (fluorescence) by the phosphor.
- the green light beam converted into fluorescence in the region 41Ga travels in the + Z-axis direction. Then, the green light beam emitted from the rotary phosphor element 41G reaches the condenser lens group 400.
- the green luminous flux emitted from the rotary phosphor element 41G is collimated by the condenser lens group 400.
- the collimated green light beam travels in the + Z-axis direction. That is, the collimated green light beam travels toward the color separation filter 72.
- the light beam condensed on the region 41Gb of the rotary phosphor element 41G passes through the rotary phosphor element 41G.
- the light beam transmitted through the rotary phosphor element 41G travels in the ⁇ Z-axis direction.
- the collimating lens group 501 is arranged in the ⁇ Z-axis direction of the rotary phosphor element 41G.
- the collimating lens group 501 includes a convex lens 501a and a convex lens 501b.
- the convex lens 501a is disposed on the + Z axis direction side of the collimating lens group 501.
- the convex lens 501b is disposed on the ⁇ Z axis direction side of the collimating lens group 501.
- the light beam transmitted through the rotary phosphor element 41G reaches the collimating lens group 501.
- the light beam transmitted through the rotary phosphor element 41G is collimated again by the collimating lens group 501.
- the light beam collimated by the collimating lens group 501 travels in the ⁇ Z-axis direction.
- the condenser lens group 502 is disposed in the ⁇ Z-axis direction of the collimating lens group 501.
- the condensing lens group 502 includes a convex lens 502a and a convex lens 502b.
- the convex lens 502 b is disposed on the + Z axis direction side of the condenser lens group 502.
- the convex lens 502 a is disposed on the ⁇ Z axis direction side of the condenser lens group 502.
- the light beam collimated by the collimating lens group 501 reaches the condensing lens group 502.
- the light beam collimated by the collimating lens group 501 is condensed by the condensing lens group 502 on the region 42Ga of the rotary phosphor element 42G.
- the light beam collected by the condenser lens group 502 travels in the ⁇ Z-axis direction.
- the rotary phosphor element 42G is arranged in the ⁇ Z-axis direction of the condenser lens group 502.
- the light beam condensed by the condensing lens group 502 reaches the rotary phosphor element 42G.
- the light beam focused on the region 42Ga of the rotary phosphor element 42G is converted into a green light beam (fluorescence) by the phosphor.
- the green light beam converted in the region 42Ga travels in the + Z-axis direction.
- the green light beam emitted from the rotary phosphor element 42G reaches the condenser lens group 502.
- the green light beam emitted from the rotary phosphor element 42G is collimated by the condenser lens group 502.
- the green light beam collimated by the condenser lens group 502 travels in the + Z-axis direction.
- the light beam collimated by the condenser lens group 502 reaches the collimating lens group 501.
- the light beam collimated by the condensing lens group 502 is condensed by the collimating lens group 501 on the region 41Gb of the rotary phosphor element 41G.
- the region 41Gb is a transmission region, the light beam condensed on the region 41Gb passes through the rotary phosphor element 41G. Note that although the rotary phosphor element 41G is rotating, the light beam reaching the rotary phosphor element 42G is transmitted through the region 41Gb, so that the fluorescence emitted from the region 42Ga also passes through the region 41Gb.
- the light beam that has passed through the rotary phosphor element 41G reaches the condenser lens group 400.
- the light beam that has passed through the rotary phosphor element 41G is collimated by the condenser lens group 400.
- the light beam collimated by the condenser lens group 400 travels in the + Z-axis direction.
- the light beam collimated by the condenser lens group 400 travels toward the color separation filter 72.
- the light beam condensed on the phosphor-coated regions 41Ga and 42Ga of the rotary phosphor elements 41G and 42G arrives after being divided in time.
- the light beam when the light beam is focused on the region 41Ga, the light beam is converted into a green light beam by the rotary phosphor element 41G.
- the light beam is condensed on the region 41Gb, the light beam is converted into a green light beam by the rotary phosphor element 42G.
- the local energy density of each phosphor can be divided in time and halved. And the conversion efficiency to the light which the fluorescent substance of the rotary phosphor elements 41G and 42G emits can be improved. In addition, the lifetime of the phosphor can be extended.
- the lenses 401, 501a, and 502a may be the same.
- the lenses 402, 501b, and 502b may be the same. That is, the collimating lens group 501 and the condensing lens group 502 are the same as the condensing lens group 400.
- the condenser lens group 400, the collimating lens group 501 and the condenser lens group 502 have the same focal point.
- the diameter of the light beam collected on the rotary phosphor element 42G is equal to the diameter of the light beam emitted from the rotary phosphor element 42G and condensed on the rotary phosphor element 41G. Is preferable.
- the interval F1 is an interval between the lens 401 and the rotary phosphor element 41G.
- the interval F2 is the interval between the rotary phosphor element 41G and the lens 501a.
- the interval F3 is an interval between the lens 502a and the rotary phosphor element 42G.
- the rotary phosphor element 41G and the rotary phosphor element 42G may be the same.
- the rotary phosphor element 41G shown in FIG. 20 or 22 is adopted as the rotary phosphor element 42G.
- the same rotary phosphor can be obtained by driving the rotary phosphor element 41G and the rotary phosphor element 42G in a time-sharing manner. That is, when viewed from the direction of the rotation axis (Z-axis direction), the rotary phosphor element 41G and the rotary fluorescence are arranged so that the region 41Gb of the rotary phosphor element 41G and the region 42Ga of the rotary phosphor element 42G overlap.
- the body element 42G may be rotated.
- the light beam transmitted through the region 41Gb of the rotary phosphor element 41G is condensed on the region 42Ga of the rotary phosphor element 42G.
- the parts can be shared, the assemblability can be improved, and the cost can be reduced.
- the case where the first excitation light source unit 10a and the second excitation light source unit 10b are arranged has been described.
- the photosynthetic element 70 and the second excitation light source unit 10b are deleted, and the first excitation light source unit 10b is deleted.
- the light source unit 10a may be moved in the ⁇ X axis direction. That is, the first excitation light source unit 10a may be moved in the direction of the biconvex lens 101.
- the dimension of the projection display device 1001 in the X-axis direction can be reduced. It is possible to reduce the size of the projection display device 1001 while maintaining the effect of extending the life of the phosphor by time division driving.
- the light source device 1001 includes the first condenser lens 400, the first rotary phosphor element 41G, and the second condenser lens 502.
- the light source device 1001 includes a phosphor element 42G.
- the first condenser lens 400 is described as the condenser lens group 400.
- the second condenser lens 502 is described as a condenser lens group 502.
- the phosphor element 42G is described as the rotary phosphor element 42G.
- the first condenser lens 400 turns the excitation light into the first condensed light.
- the first rotating phosphor element 41G is disposed at the condensing position of the first condensed light.
- the first rotary phosphor element 41G includes a first phosphor region 41Ga that emits fluorescence when a phosphor is applied and receives first condensed light, and a transmission region 41Gb that transmits the first condensed light.
- the 2nd condensing lens 502 makes the 1st condensing light which permeate
- the first condensed light reaches the first phosphor region 41Ga or the transmission region 41Gb as the first rotary phosphor element 41G rotates.
- the phosphor element 42G is disposed at the condensing position of the second condensed light.
- the phosphor element 42G includes a second phosphor region 42Ga that is coated with the phosphor element and receives the second condensed light and emits second fluorescence.
- the light source device 1001 includes a third condenser lens 501 that converts the first condensed light transmitted through the first rotary phosphor element 41G into a parallel light flux.
- the third condenser lens 501 is described as the condenser lens group 501.
- the light beam incident on the first condenser lens 400 and the light beam incident on the second condenser lens 502 are parallel light beams.
- the light beam incident on the first condenser lens 400 is not necessarily a parallel light beam.
- the light beam may be collected at the position of the first rotary phosphor element 41G by the first condenser lens 400. And the light converted into fluorescence by the 1st rotation type phosphor element 41G should just be made parallel.
- the light beam incident on the second condenser lens 502 is not necessarily a parallel light beam.
- the light beam may be collected at the position of the second rotary phosphor element 42G by the second condenser lens 502.
- the light converted into fluorescence by the 2nd rotation type phosphor element 42G should just be made parallel. This is because fluorescence is light having a large divergence angle, and in order to collect light at the position of the first rotary phosphor element 41G, it is desirable to use parallel light.
- the light source device 1001 includes a light source 110A and a collimating lens 115A.
- the light source 110A emits excitation light.
- the collimating lens 115A turns the excitation light emitted from the light source 110A into a first parallel light beam.
- the light source device 1001 includes a third condenser lens 501.
- the 3rd condensing lens 501 makes the 1st condensing light which permeate
- FIG. FIG. 23 is a block diagram schematically showing the main configuration of the light source apparatus 1002 according to Embodiment 3 of the present invention.
- the characteristics of the color separation filter 136 are different from those in the first embodiment.
- the color separation filter 136 corresponds to the color separation filter 73 of the first embodiment.
- the optical paths of the light emitted from the blue light source unit 20B and the light emitted from the red light source unit 30R are different from those in the first embodiment.
- the red and blue light beams are emitted as parallel light beams by the lens groups 200 and 300.
- the red and blue light beams are emitted as the condensed light beams by the convex lenses 131B and 131R.
- the same components as those of the first embodiment are the first excitation light source unit 10a, the second excitation light source unit 10b, the light combining element 70, the biconvex lens 101, the biconcave lens 102, the bending mirror 71, and the condenser lens group 400 (convex lens 401). And an aspherical convex lens 402).
- the condensing optical system 80 and the light intensity uniformizing element 113 are the same as those of the projection display apparatus 1 of the first embodiment.
- constituent elements subsequent to the light intensity uniformizing element 113 are the same as those of the projection display apparatus 1 of the first embodiment. That is, the same constituent elements as those in the first embodiment are the relay lens group 115 (concave lens (meniscus lens) 116, convex lens 117 and biconvex lens 118), bending mirror 120, condenser lens 122, light valve 121, and projection optical system 124. And a control unit 3.
- the light source device 2, 1001, 1002 includes a biconvex lens 101 and a biconcave lens 102 as an afocal optical system.
- the condensing lens group 400 of the light source devices 2, 1001 and 1002 includes a convex lens 401 and an aspherical convex lens 402.
- the relay lens group 115 of the light source devices 2, 1001, 1002 includes a concave / convex lens (meniscus lens) 116, a convex lens 117, and a biconvex lens 118.
- the blue light source unit 20B and the red light source unit 30R have the same functions or characteristics as those of the first embodiment, although the positions of the blue light source unit 20B and the red light source unit 30R are different from those of the first embodiment. Therefore, the reference numerals of the components constituting the blue light source unit 20B and the red light source unit 30R are the same as those in the first embodiment.
- the rotating phosphor element 42G shown in the second embodiment is used as a component corresponding to the phosphor element 40G of the first embodiment.
- the phosphor element 40G of the first embodiment may be adopted in the light source device 1002 of the third embodiment.
- the light source device 1002 includes a blue light source unit 20B.
- the blue light source unit 20B includes a blue light source group 210B that emits light in a blue wavelength region.
- the blue light source unit 20B includes a collimating lens group 215B.
- the blue light source group 210 ⁇ / b> B includes a plurality of blue light sources 211, 212, 213, 221, 222, 223, 231, 232, and 233.
- Blue light sources 211, 212, 213, 221, 222, 223, 231, 232, and 233 are arranged on the YZ plane, as in the first embodiment.
- the luminous flux emitted from the blue light source group 210B travels in the ⁇ X axis direction.
- a collimating lens group 215B is arranged in the ⁇ X-axis direction of the blue light source group 210B.
- the collimating lens group 215B includes a plurality of collimating lenses 214, 215, 216, 224, 225, 226, 234, 235, and 236.
- the blue light beam emitted from the blue light source group 210B is collimated by the collimating lens group 215B.
- the blue light beam collimated by the collimating lens group 215B travels in the ⁇ X axis direction.
- a lens 131B is arranged in the ⁇ X-axis direction of the collimating lens group 215B.
- the blue light beam collimated by the collimating lens group 215B reaches the lens 131B.
- the blue light beam collimated by the collimating lens group 215B is collected by the lens 131B.
- the blue light beam collected by the lens 131B travels in the ⁇ X axis direction.
- a color separation filter 132 is disposed in the ⁇ X axis direction of the lens 131B.
- the blue light beam collected by the lens 131B reaches the color separation filter 132.
- the blue light beam emitted from the lens 131B is reflected by the color separation filter 132.
- the blue light beam reflected by the color separation filter 132 is converted in the traveling direction from the ⁇ X axis direction to the + Z axis direction.
- a light diffusing element 133 is disposed in the + Z-axis direction of the color separation filter 132.
- the blue light beam reflected by the color separation filter 132 is collected at a position F13 on the light diffusion element 133.
- the blue light beam condensed at the condensing position F13 of the light diffusing element 133 is diffused by the light diffusing element 133.
- the blue light beam diffused by the light diffusing element 133 travels in the + Z-axis direction.
- a lens 134 is disposed in the + Z-axis direction of the light diffusing element 133.
- the blue light beam diffused by the light diffusing element 133 reaches the lens 134.
- the blue light beam reaching the lens 134 is collimated.
- the blue light beam collimated by the lens 134 travels in the + Z-axis direction.
- a color separation filter 136 is disposed in the + Z-axis direction of the lens 134.
- the blue light beam collimated by the lens 134 reaches the color separation filter 136.
- the blue light beam collimated by the lens 134 passes through the color separation filter 136.
- the blue light beam that has passed through the color separation filter 136 travels in the + Z-axis direction.
- a condensing optical system 80 is disposed in the + Z-axis direction of the color separation filter 136.
- the blue light beam that has passed through the color separation filter 136 reaches the condensing optical system 80.
- the blue light beam transmitted through the color separation filter 136 is condensed by the condensing optical system 80.
- the blue light beam condensed by the condensing optical system 80 travels in the + Z-axis direction.
- a light intensity uniformizing element 113 is disposed in the + Z-axis direction of the condensing optical system 80.
- the blue light beam condensed by the condensing optical system 80 is condensed on the incident end face 113 i of the light intensity uniformizing element 113.
- the focal position of the lens 134 is preferably the position F13. Thereby, the light beam emitted from the position F13 is collimated by the lens 134.
- the light source device 1002 includes a red light source unit 30R.
- the red light source unit 30R includes a red light source group 310R that emits light in the red wavelength region.
- the red light source unit 30R includes a collimating lens group 315R.
- the red light source group 310R includes a plurality of red light sources 311, 312, 313, 321, 322, 323, 331, 332, 333.
- the red light sources 311, 312, 313, 321, 322, 323, 331, 332, and 333 are arranged on the XY plane as in the first embodiment.
- the luminous flux emitted from the red light source group 310R travels in the + Z-axis direction.
- a collimating lens group 315R is arranged in the + Z-axis direction of the red light source group 310R.
- the collimating lens group 315R includes a plurality of collimating lenses 314, 315, 316, 324, 325, 326, 334, 335, and 336.
- the red light beam emitted from the red light source group 310R is collimated by the collimating lens group 315R.
- the red light beam collimated by the collimating lens group 315R travels in the + Z-axis direction.
- a lens 131R is arranged in the + Z-axis direction of the collimating lens group 315R.
- the red light beam collimated by the collimating lens group 315R reaches the lens 131R.
- the red light beam collimated by the collimating lens group 315R is collected by the lens 131R.
- the red light beam collected by the lens 131R travels in the + Z-axis direction.
- a color separation filter 132 is disposed in the + Z-axis direction of the lens 131R.
- the red light beam collected by the lens 131R reaches the color separation filter 132.
- the red light beam emitted from the lens 131R passes through the color separation filter 132.
- the red light beam transmitted through the color separation filter 132 travels in the + Z-axis direction.
- a light diffusing element 133 is disposed in the + Z-axis direction of the color separation filter 132.
- the red light beam transmitted through the color separation filter 132 is collected at a position F13 on the light diffusion element 133.
- the red light beam condensed at the condensing position F13 of the light diffusion element 133 is diffused by the light diffusion element 133.
- the red light beam diffused by the light diffusing element 133 travels in the + Z-axis direction.
- a lens 134 is disposed in the + Z-axis direction of the light diffusing element 133.
- the red light beam diffused by the light diffusing element 133 reaches the lens 134.
- the red light beam that has reached the lens 134 is collimated.
- the red light beam collimated by the lens 134 travels in the + Z-axis direction.
- a color separation filter 136 is disposed in the + Z-axis direction of the lens 134.
- the red light beam collimated by the lens 134 reaches the color separation filter 136.
- the red light beam collimated by the lens 134 passes through the color separation filter 136.
- the red light beam that has passed through the color separation filter 136 travels in the + Z-axis direction.
- a condensing optical system 80 is disposed in the + Z-axis direction of the color separation filter 136.
- the red light beam transmitted through the color separation filter 136 reaches the condensing optical system 80.
- the red light beam that has passed through the color separation filter 136 is condensed by the condensing optical system 80.
- the red light beam collected by the condensing optical system 80 travels in the + Z-axis direction.
- a light intensity uniformizing element 113 is disposed in the + Z-axis direction of the condensing optical system 80.
- the red light beam condensed by the condensing optical system 80 is condensed on the incident end face 113 i of the light intensity uniformizing element 113.
- the focal position of the lens 134 is preferably the position F13. Thereby, the light beam emitted from the position F13 is collimated by the lens 134.
- the condensing position of the blue light beam emitted from the blue light source group 210B may be arranged in the + Z-axis direction from the condensing position of the red light beam emitted from the red light source group 310R. Good. In this case, there are two positions F13, a condensing position of the blue light beam and a condensing position of the red light beam.
- the light diffusing element 133 may be disposed between the condensing position of the blue light beam and the condensing position of the red light beam.
- the color separation filter 132 may have a characteristic of reflecting the light beam in the blue wavelength region and transmitting the light beam in the red wavelength region.
- the positions of the blue light source unit 20B and the red light source unit 30R may be reversed.
- the color separation filter 132 may have a characteristic of transmitting a light beam in a blue wavelength region and reflecting a light beam in a red wavelength region.
- the light beam in the blue wavelength region and the light beam in the red wavelength region that are collimated by the lens 134 pass through the color separation filter 136.
- the light beam in the blue wavelength region and the light beam in the red wavelength region are condensed on the incident end surface 113 i of the light intensity uniformizing element 113 by the condensing optical system 80.
- the color separation filter 136 may have a characteristic of transmitting a light beam in a blue wavelength region and a light beam in a red wavelength region and reflecting a light beam in a green wavelength region.
- the third embodiment it is possible to separate the optical path of light emitted from the laser light source from the excitation light and fluorescent light paths of the light source using the phosphor.
- the laser light sources are the blue light source group 210B and the red light source group 310R.
- a light source using a phosphor includes a rotating phosphor element 42G. Then, the excitation light of the phosphor is emitted from the first excitation light source group 110A and the second excitation light source group 110B.
- Laser light is light that allows speckle to be easily seen.
- the fluorescence of the phosphor is light in which speckles are hardly visible.
- the light diffusing element 133 can be disposed only in the optical path of the light emitted from the laser light source. That is, it is possible to prevent a decrease in light utilization efficiency caused by disposing the light diffusing element 133 on the fluorescent light path.
- the light diffusing element 133 may be rotated. Thereby, the spot-like luminance unevenness generated on the irradiated surface 150 such as a screen changes with time. For this reason, it becomes possible to reduce the speckle visibility.
- speckle refers to spot-like luminance unevenness generated on the screen as an irradiated surface due to the interference of laser beams emitted from the light source unit. This speckle becomes a cause of image quality deterioration.
- the light diffusion element 133 is disposed in the vicinity of the incident end face 113i of the light intensity uniformizing element 113. In this case, the light utilization efficiency of the green light beam emitted from the phosphor element 40G decreases due to the diffusion of light.
- the light diffusing element 133 is disposed at a position that is conjugate with the light sources 210B and 310R, the speckle suppression effect tends to increase.
- the light diffusing element 133 is preferably arranged in the vicinity of the incident end face 113 i of the light intensity uniformizing element 113.
- the light diffusing element 133 is preferably arranged at the pupil position between the light intensity equalizing element 113 and the light valve 121.
- the “pupil position” is a position on the optical axis where the chief rays intersect.
- the position F13 is a position conjugate with the light source groups 210B and 310R in the preceding stage of the light intensity uniformizing element 113.
- the “previous stage” here is on the ⁇ Z-axis direction side. Thereby, it is not necessary to arrange the light diffusing element 133 on the optical path of the light beam (fluorescence) emitted from the rotary phosphor element 42G.
- the light diffusing element 133 is disposed between the collimating lens group 215B and the color separation element 72 on the optical path of the light emitted from the blue light source unit 20B in the configuration of FIG. May be arranged. Further, the light diffusing element 133 may be disposed between the collimating lens group 315R and the color separation filter 73 on the optical path of the light emitted from the red light source unit 30R.
- the reason why speckle is difficult to visually recognize is that the number of light sources provided in the light source units 20B and 30R is large. Moreover, the center wavelength of each light source which comprises the light source units 20B and 30R of the same color has shifted.
- a light source unit with low speckle visibility is arranged on the + X axis direction side of the color separation filter 72 as in FIG. be able to. That is, the light source unit with low speckle visibility is arranged on the front side of the color separation filter 72.
- the speckle visibility of the red light beam emitted from the red light source unit 30R is higher than the speckle visibility of the blue light beam emitted from the blue light source unit 20B
- only the blue light source unit 20B is used.
- the speckle visibility when the speckle visibility is reversed, only the red light source unit 30R can be disposed on the + X-axis direction side of the color separation filter 72. “When the speckle visibility is reversed” means that the speckle visibility of the blue light beam emitted from the blue light source unit 20B is equal to the speckle of the red light beam emitted from the red light source unit 30R. This is a case where the visibility is higher.
- the light source device 1002 includes the first laser light source 210B, the second laser light source 310R, and the color separation filter 136.
- the first laser light source 210B is described as the blue light source group 210B.
- the second laser light source 310R is described as a red light source group 310R.
- the first laser light source 210B emits a first laser beam having a wavelength range different from the fluorescence wavelength range.
- the second laser light source 310R emits second laser light having a wavelength range different from the fluorescent wavelength range and the wavelength range of the first laser light.
- the color separation filter 136 reflects or transmits light depending on the wavelength of light.
- the color separation filter 136 reflects fluorescence when transmitting the first laser light and the second laser light, and transmits fluorescence when reflecting the first laser light and the second laser light.
- the first laser light, the second laser light, and the fluorescence are arranged on the same optical path.
- Embodiment 3 has been described using the rotary phosphor element 42G.
- the phosphor element 40G shown in the first embodiment can be used instead of the rotary phosphor element 42G.
- the rotary phosphor elements 41G and 42G shown in the second embodiment can be used.
- the phosphor emits green light.
- the fluorescent color emitted from the phosphor can be other than green.
- the fluorescent color can be red or blue.
- the laser light source has been described as the blue laser light source 210B and the red laser light source 310R.
- the laser light source can be a laser light source of another color.
- the laser light source can be a green laser light source.
- FIG. FIG. 24 is a block diagram schematically showing the main configuration of the light source apparatus 1003 according to Embodiment 4 of the present invention.
- the fourth embodiment is different from the first embodiment in that a photosynthetic element 2300 is provided. Constituent elements similar to those of the projection display device 1 described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
- first excitation light source unit 10a first excitation light source group 110A and first collimating lens group 115A
- second excitation light source unit 10b second excitation light source group
- 110B and second collimating lens group 115B biconvex lens 101, biconcave lens 102, folding mirror 71, color separation filter 72, color separation filter 73, condenser lens group 400 (convex lens 401 and aspherical convex lens 402), fluorescence
- the body element 40G the blue light source unit 20B (the blue light source group 210B and the collimating lens group 215B), the red light source unit 30R (the red light source group 310R and the collimating lens group 315R), and the lens groups 200 and 300.
- the condensing optical system 80 and the light intensity uniformizing element 113 are the same as those of the projection display apparatus 1 of the first embodiment.
- constituent elements subsequent to the light intensity uniformizing element 113 are the same as those of the projection display apparatus 1 of the first embodiment. That is, the same constituent elements as those in the first embodiment are the relay lens group 115 (concave lens (meniscus lens) 116, convex lens 117 and biconvex lens 118), bending mirror 120, condenser lens 122, light valve 121, and projection optical system 124. And a control unit 3.
- the light source device 2, 1001, 1002, 1003 includes a biconvex lens 101 and a biconcave lens 102 as an afocal optical system.
- the condensing lens group 400 of the light source devices 2, 1001, 1002, and 1003 includes a convex lens 401 and an aspherical convex lens 402.
- the relay lens group 115 of the light source devices 2, 1001, 1002, and 1003 includes an uneven lens (meniscus lens) 116, a convex lens 117, and a biconvex lens 118.
- the photosynthetic element 2300 includes a surface 2300a on the + X-axis direction side.
- the surface 2300a is an incident surface on which the light emitted from the first excitation light source unit 10a enters the light combining element 2300.
- the photosynthetic element 2300 includes a surface 2300b on the ⁇ X axis direction side.
- the surface 2300b is a reflecting surface that reflects light emitted from the second excitation light source unit 10b.
- the surface 2300b is an exit surface from which the light emitted from the first excitation light source unit 10a passes through the light combining element 2300 and is emitted.
- the surface 2300a may be a reflecting surface that reflects light emitted from the second excitation light source unit 10b.
- the light emitted from the second excitation light source unit 10b passes through the surface 2300b, is reflected by the surface 2300a, and is emitted from the surface 2300b.
- the surface 2300b is a reflecting surface.
- the surface 2300a is a transmission surface.
- a reflective film is not formed on the surface 2300a.
- the surface 2300b transmits the parallel light beam emitted from the first excitation light source unit 10a.
- the surface 2300b reflects the parallel light beam emitted from the second excitation light source unit 10b.
- the parallel light beam emitted from the second excitation light source unit 10b is reflected in the ⁇ X-axis direction by the surface 2300b.
- the surface 2300b has a wavelength transmission characteristic shown in FIG.
- the first excitation light source group 110A is P-polarized light and the second excitation light source group 110B is S-polarized light.
- P-polarized light has a 90-degree polarization direction different from that of S-polarized light.
- the light emitted from the first excitation light source group 110A passes through the light combining element 2300. That is, the light emitted from the first excitation light source group 110A passes through the surface 2300a and the surface 2300b.
- the light emitted from the second excitation light source group 110B enters the surface 2300b at an angle F.
- the angle F is an angle obtained by subtracting the incident angle from 90 degrees.
- the angle F is an angle corresponding to the angle A shown in FIG.
- the light emitted from the second excitation light source group 110B is reflected by the surface 2300b of the photosynthetic element 2300.
- the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B travel in the same direction.
- the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B travel in the ⁇ X axis direction.
- the light emitted from the first excitation light source group 110A and the light emitted from the second excitation light source group 110B are superimposed on the surface 2300b.
- the angle F is an angle formed between the light emitted from the second excitation light source group 110B and the surface 2300b (reflective surface) of the light combining element 2300.
- the incident angle is defined as an angle between the traveling direction of light and the perpendicular of the boundary surface.
- the angle F is an angle obtained by rotating the surface 2300b of the light combining element 2300 counterclockwise as viewed from the + Y axis with respect to the YZ plane.
- the bending mirror 71 is arranged in the ⁇ X axis direction of the biconvex lens 101.
- the central ray of the condensed light beam emitted from the biconvex lens 101 is parallel to the X axis. Further, the bending mirror 71 is rotated by an angle B clockwise with respect to the XY plane as viewed from the + Y axis.
- the condensed light beam emitted from the biconvex lens 101 enters the bending mirror 71 at an angle G.
- the angle G is an angle obtained by subtracting the incident angle P1 from 90 degrees.
- the angle G is an angle corresponding to the angle B shown in FIG.
- the angle formed by the central ray of the light reflected by the light combining element 2300 and the reflecting surface of the bending mirror 71 is an angle G. is there.
- the angle G formed by the central ray of the light transmitted through the light combining element 2300 and the reflecting surface of the bending mirror 71 is the angle G.
- the angle G is an angle obtained by rotating the bending mirror 71 clockwise as viewed from the + Y axis with respect to the XY plane.
- FIG. 25 is a schematic view showing the shape of the photosynthetic element 2300.
- the photosynthetic element 2300 has a trapezoidal shape when observed from the Y-axis direction.
- the photosynthetic element 2300 has a wedge shape when observed from the Y-axis direction.
- the wedge shape is a shape in which one end is wide and gradually narrows as it reaches the other end.
- the photosynthetic device 2300 has a rectangular shape when observed from the X-axis direction.
- the surface 2301a is a surface obtained by extending the surface 2300a in the ⁇ Z-axis direction. That is, the surface 2301a is flush with the surface 2300a.
- the surface 2301b is a surface obtained by extending the surface 2300b in the ⁇ Z-axis direction. That is, the surface 2301b is flush with the surface 2300b.
- the surface 2301c is a surface parallel to the surface 2301b. An end portion of the surface 2301c in the + Z-axis direction is connected to an end portion of the surface 2300a in the ⁇ Z-axis direction.
- the surface 2300a and the surface 2300b are not parallel. That is, the surface 2300a is inclined with respect to the surface 2300b.
- the distance between the surface 2300a and the surface 2300b on the + Z-axis direction side is shorter than the distance between the surface 2300a and the surface 2300b on the ⁇ Z-axis direction side.
- the angle formed by the surface 2301a and the surface 2301c is an angle H.
- the angle H is not 0 degrees.
- the angle H is, for example, 3 degrees.
- FIG. 26 is a diagram showing a simulation result of light rays showing the effect of the fourth embodiment.
- the photosynthesis element 2510 shown in FIG. 26 corresponds to the photosynthesis element 2300 shown in FIG.
- a surface 2510a illustrated in FIG. 26 corresponds to the surface 2300a illustrated in FIG.
- a surface 2510b illustrated in FIG. 26 corresponds to the surface 2300b illustrated in FIG.
- a biconvex lens 2511 shown in FIG. 26 corresponds to the biconvex lens 101 shown in FIG.
- a bending mirror 2512 shown in FIG. 26 corresponds to the bending mirror 71 shown in FIG.
- a biconcave lens 2513 shown in FIG. 26 corresponds to the biconcave lens 102 shown in FIG.
- a condenser lens 2514 shown in FIG. 26 corresponds to the condenser lens group 400 shown in FIG.
- a condensing surface 2515 shown in FIG. 26 corresponds to the fluorescent surface of the phosphor element 40G shown in FIG.
- the first light beam group 2520a is light emitted from the first excitation light source unit 10a.
- the second light group 2520b is light emitted from the second excitation light source unit 10b.
- the first light ray group 2520a is represented by a broken line.
- the second light ray group 2520b is represented by a solid line.
- the distance between the surface 2510a and the surface 2510b on the + Z-axis direction side is shorter than the distance between the surface 2510a and the surface 2510b on the ⁇ Z-axis direction side.
- the first light ray group 2520a is emitted from the first excitation light source unit 10a and travels in the ⁇ X axis direction.
- the first light ray group 2520a that has traveled in the ⁇ X-axis direction reaches the surface 2510a of the light combining element 2510.
- the surface 2510a is inclined by an angle K with respect to the surface 2510b of the photosynthetic element 2510.
- the angle K corresponds to the angle H shown in FIG.
- the first light ray group 2520a that has reached the surface 2510a is transmitted through the photosynthesis element 2510.
- the first light ray group 2520a that has passed through the light combining element 2510 is emitted from the surface 2510b.
- the first light group 2520a emitted from the surface 2510b has an angle with respect to the X axis. This is because the angle at which the first light ray group 2520a is refracted at the surface 2510a and the angle at which the first light group 2520a is refracted at the surface 2510b are different.
- the first light ray group 2520a is inclined in the ⁇ Z-axis direction with respect to the X-axis and travels in the ⁇ X-axis direction.
- the light beam group 2520a that has passed through the light combining element 2510 travels in the ⁇ X-axis direction.
- the biconvex lens 2511 is arranged in the ⁇ X axis direction of the light combining element 2510.
- the first light beam group 2520 a that has passed through the light combining element 2510 reaches the biconvex lens 2511.
- the first light ray group 2520 a that has reached the biconvex lens 2511 passes through the biconvex lens 2511.
- the first light ray group 2520a transmitted through the biconvex lens 2511 travels in the ⁇ X axis direction.
- the bending mirror 2512 is arranged in the ⁇ X axis direction of the biconvex lens 2511.
- the first light ray group 2520 a that has passed through the biconvex lens 2511 reaches the bending mirror 2512.
- the central ray of the first ray group 2520a is incident on the bending mirror 2512 at an angle smaller than the angle J.
- the angle J is an angle when a central light beam of a second light beam group 2520b described later reaches the bending mirror 2512. Since the second light ray group 2520b travels parallel to the X axis, the angle J is an angle with respect to the XY plane. The angle J is an angle corresponding to the angle G in FIG.
- the angle is slightly different from the above description.
- the incident angle with respect to the bending mirror 2512 is larger than the angle J.
- the angle J is an angle larger than 45 degrees.
- the angle J is, for example, 45.8 degrees.
- the first light beam group 2520a reflected by the bending mirror 2512 travels in the ⁇ Z-axis direction.
- the biconcave lens 2513 is arranged in the ⁇ Z axis direction of the bending mirror 2512.
- the first light beam group 2520 a reflected by the bending mirror 2512 is incident on the biconcave lens 2513.
- the first light group 2520a incident on the biconcave lens 2513 becomes a parallel light beam by the biconcave lens 2513.
- the first light beam group 2520a is emitted from the biconcave lens 2513 as a parallel light beam.
- the first light group 2520a that has become a parallel light beam travels in the ⁇ Z-axis direction.
- the condenser lens 2514 is disposed in the ⁇ Z-axis direction of the biconcave lens 2513.
- the first light beam group 2520 a that has become a parallel light beam enters the condenser lens 2514.
- the first light ray group 2520a incident on the condenser lens 2514 is emitted as a condensed light beam.
- the first light beam group 2520a that has become a condensed light beam is condensed at a condensing position 2515a of the condensing surface 2515.
- the condensing surface 2515 is located in the ⁇ Z-axis direction of the condensing lens 2514.
- the condensing position 2515a of the first light ray group 2520a is located in the ⁇ X axis direction with respect to the optical axis C4.
- the optical axis C4 is the optical axis of the biconcave lens 2513 and the condenser lens 2514.
- the condensing position 2515a is relative to the optical axis C4. Located in the + X-axis direction. That is, the angle K is a negative value.
- the angle J is smaller than 45 degrees. For example, 44.2 degrees.
- the second light group 2520b is emitted from the second excitation light source unit 10b and travels in the ⁇ Z-axis direction.
- the second light ray group 2520b that has traveled in the ⁇ Z-axis direction reaches the surface 2510b of the light combining element 2510.
- the second light ray group 2520b traveling in the ⁇ Z-axis direction is incident on the surface 2510b at an angle I.
- the angle I is an angle obtained by subtracting the incident angle P1 of the second light beam group 2520b from 90 degrees.
- the angle I corresponds to the angle F in FIG.
- the angle I is 45 degrees.
- the surface 2510b is a surface rotated 45 degrees counterclockwise with respect to the YZ plane, with an axis parallel to the Y axis as a rotation axis when viewed from the + Y axis direction.
- the second light group 2520b reaching the surface 2510b is reflected by the surface 2510b.
- the second light ray group 2520b reflected by the light combining element 2510 travels in the ⁇ X axis direction.
- the biconvex lens 2511 is arranged in the ⁇ X axis direction of the light combining element 2510.
- the second light beam group 2520 b reflected by the light combining element 2510 reaches the biconvex lens 2511.
- the second light ray group 2520 b that has reached the biconvex lens 2511 passes through the biconvex lens 2511.
- the second light ray group 2520b transmitted through the biconvex lens 2511 travels in the ⁇ X axis direction.
- the second light ray group 2520 b that has passed through the biconvex lens 2511 reaches the bending mirror 2512.
- the central light beam of the second light beam group 2520b is incident on the bending mirror 2512 at an angle J.
- the angle J is an angle obtained by subtracting the incident angle P1 of the central ray of the second ray group 2520b from 90 degrees.
- the second light beam group 2520b reflected by the bending mirror 2512 travels in the ⁇ Z-axis direction.
- the biconcave lens 2513 is arranged in the ⁇ Z axis direction of the bending mirror 2512.
- the second light beam group 2520 b reflected by the bending mirror 2512 is incident on the biconcave lens 2513.
- the second light beam group 2520b incident on the biconcave lens 2513 becomes a parallel light beam by the biconcave lens 2513.
- the second light group 2520b is emitted from the biconcave lens 2513 as a parallel light beam.
- the second light group 2520b that has become a parallel light beam travels in the ⁇ Z-axis direction.
- the condenser lens 2514 is disposed in the ⁇ Z-axis direction of the biconcave lens 2513.
- the second light ray group 2520b that has become a parallel light beam enters the condenser lens 2514.
- the second light ray group 2520b that has entered the condenser lens 2514 is emitted as a condensed light beam.
- the second light beam group 2520b that has become a condensed light beam is condensed at a condensing position 2515b of the condensing surface 2515.
- the condensing surface 2515 is located in the ⁇ Z-axis direction of the condensing lens 2514. Note that the condensing position 2515b of the second light group 2520b is located in the + X-axis direction with respect to the optical axis C4.
- the condensing position 2515b is relative to the optical axis C4. -Located in the X-axis direction. That is, the angle K is a negative value.
- the angle J is smaller than 45 degrees. For example, 44.2 degrees.
- the distance between the surface 2510a and the surface 2510b on the + Z-axis direction side is shorter than the distance between the surface 2510a and the surface 2510b on the ⁇ Z-axis direction side.
- the angle J is an angle larger than 45 degrees.
- the angle J is, for example, 45.8 degrees.
- angle K shown in FIG. 26 corresponds to the angle H shown in FIG.
- the angle K is, for example, 3 degrees.
- the first light beam group 2520a passes through the light combining element 2510, and then tilts in the ⁇ Z-axis direction and proceeds in the ⁇ X-axis direction. That is, on the ⁇ X-axis direction side with respect to the light combining element 2510, the first light beam group 2520a is shifted to the ⁇ Z-axis direction side with respect to the second light beam group 2520b.
- angle I is 45 degrees, for example.
- the angle I shown in FIG. 26 corresponds to the angle F shown in FIG.
- the second light beam group 2520b is reflected by the light combining element 2510 and then proceeds in the ⁇ X axis direction without being inclined with respect to the X axis.
- the condensing position 2515a and the condensing position 2515b can be separated on the condensing surface 2515 in the X-axis direction.
- the condensing position 2515a is a condensing position of the first light beam group 2520a.
- the condensing position 2515b is a condensing position of the second light group 2520b. That is, the condensing position 2515a and the condensing position 2515b are different positions on the condensing surface 2515.
- the angle I of the light combining element 2510 is smaller than the angle J of the bending mirror 2512.
- the light can be condensed at different positions on the light collecting surface 2515 with the optical axis C4 as the center, and the relationship between the angle I and the angle J is not particularly limited to the above-described example.
- the condensing position 2515a and the condensing position 2515b can be separated on the condensing surface 2515 in the X-axis direction. That is, the condensing position 2515a and the condensing position 2515b are different positions on the condensing surface 2515.
- the angle K For example, by setting the angle K to 0.8 degrees, the angle I to 45.8 degrees, and the angle J to 45 degrees, the same effect can be obtained in the configuration of FIG. Note that it is only necessary that light can be condensed at different positions on the light condensing surface 2515 with the optical axis C4 as the center, and the relationship between the angle K and the angle I is not particularly limited to the above example.
- the light condensing position on the phosphor element 40G is separated by adjusting both the photosynthetic element 70 and the bending mirror 71.
- the fourth embodiment by using the light combining element 2300 having the angle H (the light combining element 2510 having the angle K), only the light combining element 2300 (the light combining element 2510) is adjusted, and the same as in the first embodiment. The effect is obtained.
- the angle K and the angle I of the light combining element 2510 may be adjusted.
- the folding mirror 71 bending mirror 712
- the surface 2510a of the light combining element 2510 may be configured as a reflection surface that reflects the light emitted from the second excitation light source unit 10b.
- the surface 2510b is a transmission surface that transmits the light emitted from the first excitation light source unit 10a and the light emitted from the second excitation light source unit 10b.
- the surface 2510a is a surface that transmits light emitted from the first excitation light source unit 10a.
- the light emitted from the light combining element 2510 is emitted from the light emitted from the first excitation light source unit 10a and the light emitted from the second excitation light source unit 10b, compared to the case where the surface 2510b is a reflection surface.
- the difference in angle can be increased. That is, when the condensing position on the phosphor element 40G is largely separated with the optical axis C4 as the center, the surface 2510a is preferably a reflecting surface.
- the reflection surface here is a reflection surface of light emitted from the second excitation light source unit 10b.
- the light emitted from the first excitation light source unit 10a passes through this reflecting surface.
- the phosphor element 40G has been described by taking a reflection type as an example.
- the phosphor element 40G may be a transmissive type.
- an optical path may be devised so as to reach the light intensity uniformizing element 113.
- the light source device of the projection display device 1 has been described. However, for example, it can be used as a light source device for a car headlight.
- FIG. 27 is a configuration diagram showing an example in which the light source device 1003 is applied to a headlight 1004 of a car.
- the phosphor element 40Y is a transmissive type.
- the phosphor element 40Y emits yellow fluorescence.
- the yellow fluorescence of the phosphor element 40Y is mixed with the blue excitation light of the excitation light source units 10a and 10b to become white light.
- White light is emitted in the ⁇ X axis direction from the phosphor element 40Y.
- the projection lens 2600 is disposed in the ⁇ X axis direction of the phosphor element 40Y.
- the projection lens 2600 projects white light in the ⁇ X axis direction. Note that “projection” has the same meaning as “projection”. “Projection” and “projection” mean to cast light.
- a color separation filter that transmits the wavelength band of the excitation light source units 10a and 10b and reflects the yellow wavelength band excited by the phosphor element 40Y on the + X axis direction side of the phosphor element 40Y. May be arranged.
- the color separation filter can be composed of a dichroic mirror formed of a dielectric multilayer film.
- the excitation light source units 10a and 10b may be composed of a single light source instead of a plurality of light sources. At that time, it is necessary to select an excitation light source capable of obtaining a desired brightness.
- the biconvex lens 101 and the biconcave lens 102 can be deleted. In that case, all the parallel light beams emitted from the first excitation light source unit 10 a and the second excitation light source unit 10 b may reach the aspherical convex lens 402. Thereby, size reduction is possible.
- the light combining element 70 is provided with an angle adjusting mechanism to adjust the condensing position on the phosphor element 40G of the light beam emitted from the second excitation light source unit 10b. it can. For this reason, it becomes possible to control the projection direction of the headlight.
- FIG. 28 is a configuration diagram showing an example of a light source device 1005 when the first embodiment is applied to a headlight.
- the angle A of the photosynthetic element 70 is adjusted.
- the position where the light beam emitted from the second excitation light source unit 10b is focused on the phosphor element 40Y is moved in the ⁇ X axis direction with respect to the optical axis C5 of the projection lens 2600.
- the light beam emitted from the projection lens 2600 can be moved in the + X-axis direction. Details will be described later with reference to FIG.
- the light beam emitted from the first excitation light source unit 10a is condensed at the same position of the phosphor element 40Y regardless of the angle adjustment of the light combining element 70. For this reason, the projection direction of the light beam emitted from the projection lens 2600 does not change.
- an angle adjustment mechanism is provided on the bending mirror 71 to adjust the angle B.
- the position in the X-axis direction where the light beam emitted from the first excitation light source unit 10a is condensed on the phosphor element 40Y and the light beam emitted from the second excitation light source unit 10b are applied to the phosphor element 40Y. It is possible to maintain the distance from the X-axis direction position where light is collected.
- the exit direction of the light beam emitted from the projection lens 2600 can be controlled while maintaining this interval.
- the control direction is the X-axis direction.
- an angle adjusting mechanism may be provided in both the photosynthetic element 70 and the bending mirror 71.
- an angle adjusting mechanism is provided in the photosynthetic element 2300.
- the distance from the directional position can be maintained.
- the exit direction of the light beam emitted from the projection lens 2600 can be controlled while maintaining this interval.
- the control direction is the Z-axis direction.
- FIG. 29 shows a ray trajectory diagram for explaining the behavior of the light beam.
- the coordinates shown in FIG. 29 correspond to FIG.
- the light flux is illustrated as a light beam. Further, only the ⁇ X axis direction side from the phosphor element 40Y of FIG. 27 is shown.
- the light beam 2700a emitted from the optical axis C5 of the phosphor element 40Y is collimated by the projection lens 2600.
- the light beam 2700a (light beam) is shown by a solid line.
- the collimated light beam 2700a (light beam) travels in the ⁇ X-axis direction parallel to the optical axis C5.
- the light beam 2700b emitted from the position in the ⁇ Z-axis direction with respect to the optical axis C5 of the phosphor element 40Y is collimated by the projection lens 2600.
- the light beam 2700b (light beam) is indicated by a broken line.
- the collimated light beam 2700b (light beam) is emitted from the projection lens 2600 with an inclination in the + Z-axis direction with respect to the optical axis C5. That is, the collimated light beam 2700b (light beam) is projected to the + Z-axis direction side with respect to the collimated light beam 2700a (light beam).
- the direction of the projected light beam can be controlled in the + Z-axis direction.
- the direction of the projected light beam can be controlled in the ⁇ Z-axis direction.
- the present invention can also be applied to an AFS (Adaptive Front Lighting System) that changes a light distribution pattern, such as moving the light distribution of projection light in the left-right direction of an automobile.
- AFS Adaptive Front Lighting System
- the photosynthesis element 2300 includes an incident surface 2300a on which the first excitation light is incident and an emission surface 2300b on which the first excitation light is emitted.
- the entrance surface 2300a is inclined with respect to the exit surface 2300b.
- 1 projection display device 2,1001, 1002, 1003 light source device, 1004, 1005 headlight, 3 control unit, 10a first excitation light source unit, 10b second excitation light source unit, 110A first excitation light source group, 110B second excitation light source group, 115A first collimating lens group, 115B second collimating lens group, 11a, 12a, 13a, 14a, 15a, 21a, 22a, 23a, 24a, 25a, 31a, 32a, 33a, 34a, 35a, 41a, 42a, 43a, 44a, 45a, 51a, 52a, 53a, 54a, 55a First excitation light source, 11b, 12b, 13b, 14b, 15b, 21b, 22b, 23b, 24b, 25b , 31b, 32b, 33b, 34b, 35b, 41b, 42 , 43b, 44b, 45b, 51b, 52b, 53b, 54b, 55b Second excitation light source, 16a, 17a, 18a, 19a
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Abstract
Description
<投写型表示装置1の構成>
図1は、本発明に係る実施の形態1の投写型表示装置1の主要構成を概略的に示す構成図である。図1に示されるように、投写型表示装置1は、光源装置2、光強度均一化素子113、照明光学系、ライトバルブ121及び投写光学系124を備えている。また、投写型表示装置1は、集光光学系80を備えることができる。
図2は、投写型表示装置1の第1の励起光源(第1の励起光源群110A)及び第1の平行化レンズ(第1の平行化レンズ群115A)の配置構成を説明する模式図である。図3は、投写型表示装置1の第2の励起光源(第2の励起光源群110B)及び第2の平行化レンズ(第2の平行化レンズ群115B)の配置構成を説明する模式図である。
ここで、光合成素子70に入射する光束の角度A及び折り曲げミラー71に入射する光束の角度Bに関して説明する。
光源装置2は、赤色光源ユニット30Rを備えている。赤色光源ユニット30Rは、赤色の波長域で発光する赤色光源群310Rを備えている。また、赤色光源ユニット30Rは、平行化レンズ群315Rを備えている。
光源装置2は、青色光源ユニット20Bを備えている。青色光源ユニット20Bは、青色の波長域で発光する青色光源群210Bを備えている。また、青色光源ユニット20Bは、平行化レンズ群215Bを備えている。
図16は、正面側から見たときの投写型表示装置1の構成の一部を概略的に示す模式図である。「正面側から見る」とは、-X軸方向側から+X軸方向を見ることである。
図18に光強度均一化素子113に集光する光束の光強度分布の概略図を示す。図18は、光強度均一化素子113の入射端面113i上の光強度分布を表す模式図である。図18に示された光強度分布は、等高線で概略を表されている。そして、スポット像の中心は黒丸で示されている。等高線では、スポット像の中心ほど光強度が高い分布を示している。つまり、スポット像の中心に近いほど光強度が高い。図18は、光強度均一化素子113の入射端面113iを-Z軸方向から見た図である。
SA×(sin(S1))2=一定 ・・・(1)
(sin(80))2≒4×(sin(30))2 ・・・(2)
図19は、本発明に係る実施の形態2の光源装置1001の主要構成を概略的に示す構成図である。実施の形態2は、回転式蛍光体素子41G,42G及び平行化レンズ群501、集光レンズ群502を備えている点で実施の形態1と異なる。実施の形態1で説明した投写型表示装置1の構成要素と同様の構成要素には、同一符号を付し、その説明を省略する。
回転式蛍光体素子41Gは、例えば、図20では、円板形状をしている。そして、円板の周縁部の一部に蛍光体が塗布されている。なお、回転式蛍光体素子41Gは、円板形状に限られない。
第1の励起光源ユニット10a及び第2の励起光源ユニット10bから出射された光束は、両凸レンズ101及び両凹レンズ102により平行化される。そして、第1の励起光源ユニット10a及び第2の励起光源ユニット10bから出射された光束は、集光レンズ群400に入射する。
図23は、本発明に係る実施の形態3の光源装置1002の主要構成を概略的に示す構成図である。
光源装置1002は、青色光源ユニット20Bを備えている。青色光源ユニット20Bは、青色の波長域で発光する青色光源群210Bを備えている。また、青色光源ユニット20Bは、平行化レンズ群215Bを備えている。
光源装置1002は、赤色光源ユニット30Rを備えている。赤色光源ユニット30Rは、赤色の波長域で発光する赤色光源群310Rを備えている。また、赤色光源ユニット30Rは、平行化レンズ群315Rを備えている。
ここで、色分離フィルタ132は、青色の波長域の光束を反射し、赤色の波長域の光束を透過する特性を有すればよい。
図24は、本発明に係る実施の形態4の光源装置1003の主要構成を概略的に示す構成図である。実施の形態4は、光合成素子2300を備えている点で実施の形態1と異なる。実施の形態1で説明した投写型表示装置1の構成要素と同様の構成要素には、同一符号を付し、その説明を省略する。
実施の形態1と異なる構成要素となる光合成素子2300に関して説明する。
図26は、本実施の形態4の効果を示す光線のシミュレーション結果を示す図である。
第1の光線群2520aは、第1の励起光源ユニット10aから出射されて、-X軸方向に進行する。-X軸方向に進行した第1の光線群2520aは、光合成素子2510の面2510aに到達する。
第2の光線群2520bは、第2の励起光源ユニット10bから出射されて、-Z軸方向に進行する。-Z軸方向に進行した第2の光線群2520bは、光合成素子2510の面2510bに到達する。
また、上述の各実施の形態においては、投写型表示装置1の光源装置に関して説明している。しかし、例えば、車のヘッドライト用の光源装置として用いることができる。
Claims (11)
- 第1の励起光を透過して、第2の励起光を反射する光合成素子と、
前記第1の励起光及び前記第2の励起光を受けて第1の蛍光を発する蛍光体素子と
を備え、
前記光合成素子から出射する前記第1の励起光の出射角と前記光合成素子で反射する前記第2の励起光の反射角とが異なることにより、前記光合成素子を透過した前記第1の励起光が前記蛍光体素子に到達する位置と前記光合成素子で反射された前記第2の励起光が前記蛍光体素子に到達する位置とが異なる光源装置。 - 前記第1の励起光は、前記第2の励起光を反射する前記光合成素子の反射面を透過する請求項1に記載の光源装置。
- 前記第1の励起光及び前記第2の励起光はレーザー光であり、
前記第1の励起光の偏光方向は、前記第2の励起光の偏光方向に対して90度異なる請求項2に記載の光源装置。 - 前記光合成素子は、前記第1の励起光を透過する透過領域と、前記第2の励起光を反射する反射領域の反射面とを備え、
前記反射領域は、前記透過領域とは異なる領域である請求項1に記載の光源装置。 - 前記透過領域は透過面を備え、
前記透過面は、前記反射面と同一の面上に位置する請求項4に記載の光源装置。 - 前記透過領域は、前記光合成素子に設けられた穴で形成されている請求項4に記載の光源装置。
- 前記光合成素子は、前記第1の励起光が入射する入射面と前記第1の励起光が出射する出射面とを備え、
前記入射面は、前記出射面に対して傾斜している請求項1から6のいずれか1項に記載の光源装置。 - 前記光合成素子の反射面又は透過面は、前記第1の励起光の光束の中心光線と前記第2の励起光の光束の中心光線とを含む面の第1の法線を含み、前記第1の法線を回転軸として回転して配置された請求項1から7のいずれか1項に記載の光源装置。
- 前記光合成素子を透過した前記第1の励起光及び前記光合成素子で反射された前記第2の励起光を反射する折り曲げミラーをさらに備え、
前記折り曲げミラーの反射面は、前記折り曲げミラーに入射する前記第1の励起光の光束の中心光線と前記折り曲げミラーで反射された前記第1の励起光の光束の中心光線とを含む平面の第2の法線を含み、前記第2の法線を回転軸として回転して配置された請求項1から8のいずれか1項に記載の光源装置。 - 前記第1の励起光又は前記第2の励起光を第1の集光光にする第1の集光レンズと、
前記第1の集光光の集光位置に配置され、蛍光体が塗布されて前記第1の集光光を受けて第2の蛍光を発する第1の蛍光体領域及び前記第1の集光光を透過する透過領域を含む第1の回転式蛍光体素子と、
前記第1の回転式蛍光体素子を透過した前記第1の集光光を第2の集光光にする第2の集光レンズと
をさらに備え、
前記第1の集光光は、前記第1の回転式蛍光体素子が回転することで、前記第1の蛍光体領域又は前記透過領域に到達し、
前記蛍光体素子は、前記第2の集光光の集光位置に配置されている請求項1から9のいずれか1項に記載の光源装置。 - 前記第1の蛍光の波長域と異なる波長域の第1のレーザー光を発する第1のレーザー光源と、
前記第1の蛍光の波長域及び前記第1のレーザー光の波長域と異なる波長域の第2のレーザー光を発する第2のレーザー光源と、
光の波長により光を反射し又は透過する色分離フィルタと、
をさらに備え、
前記色分離フィルタは、前記第1のレーザー光及び前記第2のレーザー光を透過する場合には、前記第1の蛍光を反射し、前記第1のレーザー光及び前記第2のレーザー光を反射する場合には、前記第1の蛍光を透過することで、前記第1のレーザー光、前記第2のレーザー光及び前記第1の蛍光を同一の光路上に配置させる請求項1から10のいずれか1項に記載の光源装置。
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JP2016505219A JP6141512B2 (ja) | 2014-02-27 | 2015-02-24 | 光源装置 |
CN201580009755.0A CN106030403B (zh) | 2014-02-27 | 2015-02-24 | 光源装置 |
DE112015001042.4T DE112015001042T5 (de) | 2014-02-27 | 2015-02-24 | Lichtquellenvorrichtung |
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PCT/JP2015/055124 WO2015129656A1 (ja) | 2014-02-27 | 2015-02-24 | 光源装置 |
Country Status (5)
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US (1) | US20160334695A1 (ja) |
JP (1) | JP6141512B2 (ja) |
CN (1) | CN106030403B (ja) |
DE (1) | DE112015001042T5 (ja) |
WO (1) | WO2015129656A1 (ja) |
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JP2016170390A (ja) * | 2015-03-09 | 2016-09-23 | セイコーエプソン株式会社 | 光源装置及びプロジェクター |
JP2017111192A (ja) * | 2015-12-14 | 2017-06-22 | セイコーエプソン株式会社 | 光源装置及びプロジェクター |
JP2017111177A (ja) * | 2015-12-14 | 2017-06-22 | セイコーエプソン株式会社 | 光源装置及びプロジェクター |
JP2017116906A (ja) * | 2015-12-18 | 2017-06-29 | カシオ計算機株式会社 | 光源装置及び投影装置 |
JP2017223932A (ja) * | 2016-06-13 | 2017-12-21 | パナソニックIpマネジメント株式会社 | 投写型映像表示装置 |
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US9977319B2 (en) | 2015-12-18 | 2018-05-22 | Casio Computer Co., Ltd. | Light source device with light splitting mirror and reflection mirror for reducing influence on uniformity of intensity distribution of beam flux, and projection device |
JPWO2018142589A1 (ja) * | 2017-02-03 | 2019-11-14 | Necディスプレイソリューションズ株式会社 | 光源装置及び投写型表示装置 |
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JP2022017397A (ja) * | 2016-02-10 | 2022-01-25 | パナソニックIpマネジメント株式会社 | 投写型映像表示装置 |
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JP2017110975A (ja) * | 2015-12-15 | 2017-06-22 | キヤノン株式会社 | 計測装置、システム、計測方法、決定方法及びプログラム |
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2015
- 2015-02-24 DE DE112015001042.4T patent/DE112015001042T5/de not_active Withdrawn
- 2015-02-24 WO PCT/JP2015/055124 patent/WO2015129656A1/ja active Application Filing
- 2015-02-24 JP JP2016505219A patent/JP6141512B2/ja active Active
- 2015-02-24 US US15/109,578 patent/US20160334695A1/en not_active Abandoned
- 2015-02-24 CN CN201580009755.0A patent/CN106030403B/zh active Active
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JP2013114980A (ja) * | 2011-11-30 | 2013-06-10 | Seiko Epson Corp | 光源装置及びプロジェクター |
JP2014082144A (ja) * | 2012-10-18 | 2014-05-08 | Sony Corp | 光源装置及び画像表示装置 |
JP2014085623A (ja) * | 2012-10-26 | 2014-05-12 | Sony Corp | 光源ユニット、光源装置、及び画像表示装置 |
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JP2016170390A (ja) * | 2015-03-09 | 2016-09-23 | セイコーエプソン株式会社 | 光源装置及びプロジェクター |
JP2017111192A (ja) * | 2015-12-14 | 2017-06-22 | セイコーエプソン株式会社 | 光源装置及びプロジェクター |
JP2017111177A (ja) * | 2015-12-14 | 2017-06-22 | セイコーエプソン株式会社 | 光源装置及びプロジェクター |
US9977319B2 (en) | 2015-12-18 | 2018-05-22 | Casio Computer Co., Ltd. | Light source device with light splitting mirror and reflection mirror for reducing influence on uniformity of intensity distribution of beam flux, and projection device |
JP2017116906A (ja) * | 2015-12-18 | 2017-06-29 | カシオ計算機株式会社 | 光源装置及び投影装置 |
JP2022017397A (ja) * | 2016-02-10 | 2022-01-25 | パナソニックIpマネジメント株式会社 | 投写型映像表示装置 |
JP2017223932A (ja) * | 2016-06-13 | 2017-12-21 | パナソニックIpマネジメント株式会社 | 投写型映像表示装置 |
JP2018040881A (ja) * | 2016-09-06 | 2018-03-15 | セイコーエプソン株式会社 | 照明装置及びプロジェクター |
JPWO2018142589A1 (ja) * | 2017-02-03 | 2019-11-14 | Necディスプレイソリューションズ株式会社 | 光源装置及び投写型表示装置 |
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US10941916B2 (en) | 2017-03-29 | 2021-03-09 | Panasonic Intellectual Property Management Co., Ltd. | Light source unit and illuminating device |
JP2020177070A (ja) * | 2019-04-16 | 2020-10-29 | パナソニックIpマネジメント株式会社 | 光源装置及び投写型表示装置 |
JP7336762B2 (ja) | 2019-04-16 | 2023-09-01 | パナソニックIpマネジメント株式会社 | 光源装置及び投写型表示装置 |
WO2023037729A1 (ja) * | 2021-09-09 | 2023-03-16 | パナソニックIpマネジメント株式会社 | 投写型画像表示装置 |
Also Published As
Publication number | Publication date |
---|---|
JP6141512B2 (ja) | 2017-06-07 |
CN106030403A (zh) | 2016-10-12 |
JPWO2015129656A1 (ja) | 2017-03-30 |
CN106030403B (zh) | 2017-10-20 |
DE112015001042T5 (de) | 2016-12-29 |
US20160334695A1 (en) | 2016-11-17 |
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