WO2014109333A1 - Dispositif de conversion de longueur d'onde, système optique d'éclairage et dispositif électronique l'utilisant - Google Patents

Dispositif de conversion de longueur d'onde, système optique d'éclairage et dispositif électronique l'utilisant Download PDF

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Publication number
WO2014109333A1
WO2014109333A1 PCT/JP2014/050155 JP2014050155W WO2014109333A1 WO 2014109333 A1 WO2014109333 A1 WO 2014109333A1 JP 2014050155 W JP2014050155 W JP 2014050155W WO 2014109333 A1 WO2014109333 A1 WO 2014109333A1
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Prior art keywords
light
band
region
phosphor
wavelength
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PCT/JP2014/050155
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English (en)
Japanese (ja)
Inventor
古賀　律生
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ゼロラボ株式会社
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Priority to JP2014556425A priority Critical patent/JP6292523B2/ja
Publication of WO2014109333A1 publication Critical patent/WO2014109333A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/06—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements
    • A61B1/0653—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor with illuminating arrangements with wavelength conversion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • A61B1/00163—Optical arrangements
    • A61B1/00172—Optical arrangements with means for scanning
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • 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
    • G03B33/00—Colour photography, other than mere exposure or projection of a colour film
    • G03B33/08—Sequential recording or projection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources

Definitions

  • the present invention relates to an illumination optical system using a laser light source that emits laser light in a blue band, and more particularly to an illumination optical system used for a light source of an electronic device such as a projector or optical equipment.
  • a blue laser emitter is used as a light source for a light source unit of a projector (Patent Document 1).
  • the light source unit includes a blue laser emitter, a phosphor wheel, and a plurality of reflecting mirrors and dichroic mirrors.
  • the phosphor wheel has a disk shape rotated by a motor, and the phosphor wheel has a transmission part that transmits blue band light, and a phosphor that emits blue band light in red band and green band. Each layer is formed.
  • the light source unit shown in Patent Document 1 has a configuration in which the phosphor wheel transmits blue band light, the optical system layout and the like are limited, and the light source unit is not necessarily reduced in size and space. It was not suitable for.
  • an object of the present invention is to provide a wavelength conversion device, an illumination optical system, and an electronic apparatus using the same, which reduce the number of optical components, and save space, weight, and cost.
  • a wavelength conversion device is used in an illumination optical system, and includes a wavelength conversion region that emits light having a wavelength different from that of the blue band based on incident blue band light. Are formed concentrically at the center of rotation, and the wavelength conversion region is formed in n sets (n is an integer of 2 or more) in the radial direction.
  • the one wavelength conversion region includes a first phosphor region that emits red band light based on blue band light, and a second phosphor region that emits green band light based on blue band light. Including.
  • the wavelength conversion device further includes a reflection region that reflects light in the first wavelength band, a first phosphor region that emits light in the second wavelength band based on at least light in the first wavelength band, and A first rotating member including a second phosphor region that emits light in a third wavelength band; a first transmission region that transmits light in the first wavelength band reflected from the reflection region; A second transmission region that transmits light in the second wavelength band output from the first phosphor region, and a third that transmits light in the third wavelength band output from the second phosphor region. And a second rotating member including a transmission region.
  • the wavelength conversion device further includes a reflection region that reflects light in the first wavelength band, and a first phosphor region that emits light in the second wavelength band based on at least light in the first wavelength band.
  • a first rotation member including a first transmission region that transmits light in the first wavelength band reflected from the reflection region, and light in the second wavelength band output from the first phosphor region.
  • a second rotating member including a first extraction region for extracting light in the third wavelength band and a second extraction region for extracting light in the fourth wavelength band from the light in the second wavelength band; Including.
  • the illumination optical system includes the wavelength conversion device having the above-described configuration and an optical system that causes n sets of light beams in the blue band to enter the wavelength conversion device.
  • the optical system includes n sets of lenses for condensing a blue-band light bundle in each of the n sets of wavelength conversion regions, and an optical axis of the blue-band light bundle is different from an optical axis of the lens.
  • the projector and the endoscope according to the present invention are configured using the illumination optical system having the above configuration.
  • an illumination optical system and an electronic device using the same which are reduced in the number of parts and reduced in size, weight, and cost.
  • FIG. 3A is a plan view of the phosphor wheel of the present embodiment
  • FIG. 3B is a sectional view taken along line XX.
  • FIG. 4A is a diagram illustrating a state in which light in the blue band is reflected by the phosphor wheel according to the present embodiment
  • FIG. 4B is a diagram illustrating the red band / green band by the phosphor wheel according to the present embodiment. It is a figure explaining a mode that light is reflected.
  • FIG. 4A is a diagram illustrating a state in which light in the blue band is reflected by the phosphor wheel according to the present embodiment
  • FIG. 4B is a diagram illustrating the red band / green band by the phosphor wheel according to the present embodiment. It is a figure explaining a mode that light is reflected.
  • FIG. 4A is a diagram illustrating a state in which light in the blue band is reflected by the phosphor wheel according to the present embodiment
  • FIG. 4B is a diagram illustrating the red band
  • FIG. 5A is a diagram for explaining the principle of an illumination optical system according to the second embodiment of the present invention
  • FIG. 5B is a plan view of a phosphor wheel used in the second embodiment
  • FIG. 5C is a diagram for explaining the combined luminance of the R, G, and B lights combined according to the second embodiment.
  • It is a graph which shows the relationship between the light emission change efficiency of a fluorescent substance, and irradiation energy density.
  • FIG. 10A shows a configuration of the phosphor wheel in FIG. 10
  • FIG. 10A is a plan view of the second wheel member
  • FIG. 10B is a plan view of the first wheel member
  • FIG. It is a top view which shows the modification of a 2nd wheel member.
  • It is a graph which shows the relationship between the light intensity of a green zone
  • It is a graph which shows the relationship between the light intensity and angle of the light of a green zone
  • FIG. 1 It is a figure which shows an example of the wavelength selected in the blue transmission area
  • FIG. 21A is a plan view of a first wheel member according to the fifth embodiment
  • FIG. 21B is a plan view of a second wheel member.
  • FIG. 23A is a plan view of the phosphor wheel of the sixth embodiment
  • FIG. 23B is a sectional view taken along line XX of FIG. 23A.
  • the illumination optical system uses a blue laser element or an array light source in which blue light emitting diodes are arrayed as a semiconductor light emitting element that emits blue light having a short wavelength.
  • the illumination optical system is used in a projector that reflects light by a light modulation device such as DLP or DMD.
  • a light modulation device such as DLP or DMD.
  • FIG. 1 is a diagram for explaining the basic principle of an illumination optical system according to the first embodiment of the present invention.
  • red band light, green band light, and blue band light may be abbreviated as R, G, and B for convenience.
  • the illumination optical system 10 of the present embodiment includes an array light source 20 that emits blue band laser light as excitation light, front group lenses L1 and L2 that condense the laser light from the array light source 20, and a front group lens L1. , Rear group lenses L3 and L4 for condensing the laser light collected by L2 on the phosphor wheel 50, a dichroic mirror 30 that transmits light in the blue band and reflects light in the red band and green band, Reflected by a reflection mirror 40 disposed at the rear of the dichroic mirror 30 and at the same angle as the dichroic mirror 30, a disk-shaped phosphor wheel 50, a motor 60 that rotates the phosphor wheel 50, and the dichroic mirror 30.
  • the light emitted from the light tunnel 70 is guided to a spatial modulation device such as DMD (not shown), an optical fiber, or the like.
  • the condensing lens L5 and the light tunnel 70 are not necessarily essential, and can be replaced or changed to an optical system according to the light source of the applied electronic device.
  • the array light source 20 includes a plurality of semiconductor laser elements (or blue light emitting diodes) that emit blue band laser light in an array.
  • the plurality of semiconductor laser elements are arranged one-dimensionally or two-dimensionally, and the plurality of semiconductor laser elements are driven at the same time, so that laser light is emitted from each semiconductor laser element all at once.
  • FIG. 2 is a schematic cross-sectional view showing one configuration example of the array light source.
  • a substrate on which a plurality of semiconductor laser elements are mounted is supported by a support member 22 made of a metal material having high thermal conductivity, such as aluminum.
  • a lens 24 for collimating the laser light emitted from each semiconductor laser element is attached to the surface of the support member 22.
  • a reflection mirror 26 is disposed on the side facing the support member 22, and the reflection mirror 26 reflects blue band light emitted from each semiconductor laser element in a certain direction to generate a laser beam bundle Lb.
  • the front group lens L1 is composed of, for example, a plano-convex lens and condenses the laser beam Lb from the array light source 20, and the front group lens L2 is composed of, for example, a concave lens, and is separated from the array light source 20 by the front group lenses L1 and L2.
  • the laser beam Lb is condensed into parallel light.
  • the optical axis C1 of the front group lenses L1 and L2 is the center of the lenses L1 and L2.
  • the front group lenses L1 and L2 may be any optical system that can collect the laser beam bundle Lb from the array light source 20, and the number of lenses constituting the front group lens may be one. Or three or more. Further, the lens may be either a spherical lens or an aspheric lens.
  • the rear group lenses L3 and L4 are composed of, for example, a combination of a spherical lens such as a convex lens and a concave lens, or an aspheric lens, and the laser beam bundle Lb collected by the front group lenses L1 and L2 is further collected on the phosphor wheel 50. Shine.
  • the optical axis C2 of the rear group lenses L3 and L4 is the center of the lenses L3 and L4.
  • the rear group lenses L3 and L4 may be any optical system that can focus the laser beam bundle Lb on the phosphor wheel 50, and the number of lenses constituting the rear group lens may be one. Or three or more.
  • the illumination optical system 10 of this embodiment is an optical system in which the optical axis C2 of the rear group lenses L3 and L4 is shifted from the optical axis C1 of the front group lenses L1 and L2.
  • the shifts of the optical axes C1 and C2 are adjusted so that the laser beams condensed by the group lenses L1 and L2 are incident on one half of the rear group lens L3.
  • the dichroic mirror 30 is disposed on the optical axes C1 and C2, and intersects the optical axes C1 and C2 at an angle of approximately 45 degrees.
  • the dichroic mirror 30 has an optical property of transmitting blue band light and reflecting red band and green band light. For this reason, the light in the blue band collected by the front lens groups L1 and L2 passes through the dichroic mirror 30 and enters one half of the rear lens groups L3 and L4. Further, the dichroic mirror 30 reflects light in the red band and the green band reflected by the phosphor wheel 50 almost at right angles to the optical axis, as will be described later.
  • the reflection mirror 40 disposed at the same angle as the dichroic mirror 30 is located at the rear part of the dichroic mirror 30 and reflects the blue band light normally reflected by the phosphor wheel 50 in a direction orthogonal to the optical axes C1 and C2. To do.
  • the reflection mirror 40 can be configured by a total reflection mirror that reflects all wavelengths, or a dichroic mirror that reflects light in the blue band and transmits light in the red and green bands. When the reflection mirror 40 is composed of the latter dichroic mirror, the reflection mirror 40 may be disposed behind or in front of the dichroic mirror 30.
  • the reflection mirror 40 is positioned so as not to block the laser light Lb collected by the front lens groups L1 and L2, and coincides with the optical axis of the condenser lens L5.
  • the positional relationship may be such that the laser beam Lb overlaps the reflection mirror 40.
  • the condensing lens L5 condenses the light reflected by the dichroic mirror 30 and the reflection mirror 40 and makes the collected light enter the light tunnel 70.
  • the optical axis C3 of the lens L5 is the center of the lens L5, and the optical axis C3 is the same as the optical axes of the reflection mirror 40 and the dichroic mirror 30, and is orthogonal to the optical axes C1 and C2. Therefore, the light reflected by the dichroic mirror 30 and the reflection mirror 40 is condensed on the same optical path by the condenser lens L5.
  • the rear group lenses L3 and L4 are arranged between the dichroic mirror 30 and the phosphor wheel 50, and condense blue band light transmitted through the dichroic mirror 30 on the surface of the phosphor wheel 50.
  • the phosphor wheel 50 is a disk-like rotating body that is rotated at a constant speed by a motor 60, and the surface thereof reflects the light in the blue band in the circumferential direction.
  • the region 52 includes a first phosphor region 54 that emits light in the red band when excited by light in the blue band, and a second phosphor region 56 that emits light in the green band when excited by light in the blue band. It is out.
  • the reflection region 52, the first phosphor region 54, and the second phosphor region 56 have a certain width in the radial direction, and this width is the width of the spot P collected by the rear group lenses L3 and L4. Somewhat larger than the diameter.
  • the circumferential lengths of the reflection region 52, the first phosphor region 54, and the second phosphor region 56, that is, the respective inner angles thereof, depend on the required R, G, B luminances, etc. It is selected appropriately.
  • the phosphor wheel 50 includes a base material made of glass, resin or metal.
  • the surface of the rotator constitutes a reflecting mirror that reflects light of R, G, and B wavelengths
  • the first phosphor region 54 and the second phosphor region 56 are the surfaces of the reflecting mirror.
  • the phosphor layers 54a and 54b are laminated.
  • a reflective layer that reflects at least blue band light may be formed on the surface of the substrate.
  • the reflection region 52 may be formed with irregularities on its surface so as to diffuse the incident blue band light minutely.
  • the first phosphor region 54 includes the phosphor layer 54a that is excited by the blue band laser light and emits the red band light on the surface of the base material.
  • the phosphor layer 54a may be formed on the surface of the base material, or may be formed on the reflective layer by forming a reflective layer on the surface of the base material. It should be noted that the thickness of the phosphor layer 54a shown in FIG. 3B is exaggerated.
  • the second phosphor region 56 includes a phosphor layer 56a that is excited by blue band light and emits green band light.
  • the phosphor materials constituting the phosphor layers 54a and 56a include YAG (yttrium, aluminum, garnet), TAG (terbium, aluminum, garnet), sialon, BOS (barium orthosilicate), and nitride compounds. It has been known.
  • the phosphor layers 54a and 56a are, for example, applied on the surface of the base material mixed with a phosphor material and a resin material or a ceramic material, or pasted on the surface of the base material and a sheet-like material mixed with the phosphor material. You may make it attach.
  • the surface of the phosphor wheel 50 is irradiated with the light in the blue band of the spot P, and the phosphor wheel 50 is rotated so that the reflection region 52 and the first and second phosphor regions 54 and 56 are formed.
  • the spot P is optically scanned.
  • the phosphor wheel 50 is formed with the phosphor layers 54a and 56a for emitting light in the red band and the green band.
  • the light excited by the blue laser light is not necessarily red. It is not limited to light in the band and the green band.
  • a phosphor layer that excites light in the yellow, magenta, and cyan bands may be formed.
  • FIG. 4A shows a state in which blue band light is regularly reflected by the reflection region 52 of the phosphor wheel 50. That is, the parallel light bundles Lb from the front lens groups L1 and L2 are transmitted through the dichroic mirror 30 and incident on one half of the rear lens groups L3 and L4 shifted from the optical axis C2.
  • the light beam Lb irradiates the reflection region 52 of the phosphor wheel 50 by the rear lens groups L3 and L4. At this time, the light beam Lb is regularly reflected, that is, the incident angle and the reflection angle of the light beam Lb with respect to the optical axis C2 are substantially equal.
  • the light beam Lb reflected by the phosphor wheel 50 is emitted from the opposite side of the rear lens groups L3 and L4, and the light Lb passes through the dichroic mirror 30 and is reflected by the reflecting mirror 40 at a substantially right angle. And condensed by the condenser lens L5.
  • FIG. 4B shows a state in which light in the red band or green band is reflected by the first or second phosphor regions 54 and 56 of the phosphor wheel 50. That is, as in the case of FIG. 4A, the light flux Lb in the blue band irradiates the first phosphor region 54. The phosphor layer 54a excited by the light beam Lb emits light in the red band. At this time, the light in the red band becomes light spreading in a Lambertian shape (uniform diffusion). The red band light Lr reflected in a Lambertian shape is condensed by the lenses L4 and L3, and further reflected by the dichroic mirror 30 at a substantially right angle and is incident on the condensing lens L5. This operation is the same when the second phosphor region 56 emits green band light Lg.
  • R, G, and B laser beam bundles are sequentially generated and directed from the light tunnel 70 to a digital mirror device (DMD) or the like.
  • DMD digital mirror device
  • the DMD has a plurality of mirror elements formed in a two-dimensional array, and each mirror element is tilted to the first angle or the second angle according to the digital image data and reflected by the DMD.
  • the R, G, and B light generated generates a projection image.
  • the phosphor wheel 50 reflects all of R, G, and B, and the dichroic mirror 30 and the reflection mirror 40 selectively reflect R, G, and B light. Since it did in this way, the optical member required for the illumination optical system 10 can be reduced, and a compact structure can be obtained.
  • the dichroic mirror 30 and the reflection mirror 40 are arranged so as to overlap in the same direction, and the rear group lenses L3 and L4 are interposed between the dichroic mirror 30 and the phosphor wheel 50, so that space saving is achieved. More promoted.
  • FIG. 5 is a diagram showing the principle of the illumination optical system 10A according to the second embodiment.
  • two sets of the dichroic mirror 30, the reflection mirror 40, and the rear group lens L used in the first embodiment are provided, and R, G, and B are respectively obtained from two beam bundles separated by the beam splitter. Generated and synthesized at the end.
  • a plurality of phosphor wheels are used instead of a single one, and two sets of reflection regions and first and second phosphor regions are formed on the surface in the circumferential direction.
  • the rear lens group L is constituted by a single lens.
  • parallel light bundles Lb from the front lens groups L1 and L2 are separated into two light bundles Lb1 and Lb2 by the beam splitter 200.
  • the separated light bundle Lb1 as in the first embodiment, R, G, and R via the dichroic mirror 30, the rear group lens L, the phosphor wheel 50A, the dichroic mirror 30 or the reflection mirror 40 are used.
  • the B light is incident on the condenser lens L5.
  • the light beam Lb1 is focused on the outer peripheral side of the phosphor wheel 50A, and the reflection region 52, the first and second phosphor regions 54, 56 are optically moved at the spot P. Scan.
  • the other light beam Lb2 is reflected almost at right angles by the reflection mirror 210 and is made parallel to the light beam Lb1.
  • the center of the reflection mirror 210 or the optical axis C4 is shifted from the optical axis C2 of the rear group lens LA, and the light beam Lb2 is incident on one half of the rear group lens LA via the dichroic mirror 30A.
  • the incident light bundle Lb2 is focused on the spot Q on the inner peripheral side of the phosphor hole 50A by the rear group lens LA, and the reflection region 82 and the first and second phosphor regions 84 and 86 are optically reflected by the spot Q. Scan to.
  • FIG. 5C represents the combined luminance when the luminances of R, G, and B of the spot P and the spot Q are combined.
  • the arrangement of the reflection region 52 on the outer peripheral side on the phosphor wheel 80A, the first and second phosphor regions 54 and 56, the reflection region 82 on the inner peripheral side, and the first and second phosphor regions 84 and 86 The arrangement is adjusted so that the timings at which R, G, and G are generated are synchronized.
  • FIG. 6 shows the relationship between the emission conversion amount of the phosphor and the irradiation energy density of the excitation light.
  • a linear region in which the luminescence conversion efficiency increases (conversion efficiency is constant) with increasing light irradiation energy density a saturated region in which the luminescence conversion amount is saturated (conversion efficiency decreases), and luminescence conversion amount Is known to have a degradation region in which the degradation occurs.
  • the first and second phosphor layers 54, 56, 84, 86 are irradiated with blue light having a certain energy or more, the light emission conversion amount is saturated or deteriorated, and the phosphor is thermally damaged or deteriorated. Resulting in.
  • the phosphor has a deterioration in light emission conversion efficiency even with a change with time.
  • the blue band light is divided into two, and two sets of phosphor layers are formed on the phosphor wheel. Therefore, the irradiation energy with which the phosphor layer is irradiated can be substantially halved.
  • the phosphor can be used in a linear region, and deterioration of the light emission conversion amount can be prevented.
  • thermal damage or thermal deterioration of the phosphor layer can be suppressed, and the lifetime of the phosphor can be extended.
  • the light bundle Lb is separated into two.
  • the light bundle Lb is divided into n pieces, and n sets of dichroic mirrors, reflection mirrors, lenses, and n sets of reflection areas.
  • the illumination optical system may be formed by a phosphor wheel in which the phosphor region is formed.
  • FIG. 7A is a plan view of the phosphor wheel 300
  • FIG. 7B is a sectional view taken along line XX. 7 (C1) to (C4) show various modifications of the first phosphor region 320
  • FIGS. 7 (D1) to (D3) show various modifications of the reflection region 310.
  • FIG. 7A is a plan view of the phosphor wheel 300
  • FIGS. 7 (D1) to (D3) show various modifications of the reflection region 310.
  • FIG. 7A is a plan view of the phosphor wheel 300
  • FIGS. 7 (D1) to (D3) show various modifications of the reflection region 310.
  • FIG. 7A is a plan view of the
  • a doughnut-shaped reflection layer 324 is formed on a base material 322 such as a disk-shaped glass or resin constituting the phosphor wheel 300, and the first fluorescence is formed on the reflection layer 324.
  • a body 320A is formed.
  • the first phosphor 320A emits red light when excited by blue light.
  • the luminous efficiency of the phosphor is improved by providing the reflective layer 324, if the reflective layer 324 reflects all wavelengths of R, G, and B, the blue light transmitted through the first phosphor 320A can be reduced. There is a possibility that red and blue colors are mixed by being reflected by the reflective layer 324.
  • a dichroic mirror 326 that reflects the fluorescent emission color and absorbs or transmits blue light is coated immediately below the first phosphor 320A. More preferably, a layer 326 that reflects R, G, and (Y) and transmits or absorbs blue light is formed. The same applies to the second phosphor 330. Thereby, the color mixture of the fluorescence emission color and the blue light can be prevented.
  • the reflection layer 324 may be inclined so that the end portion of the base material 322A is thickened.
  • the blue light transmitted through the first phosphor 320A is mixed with the fluorescent color. That is, since the blue light incident from the half surface of the lens 70 has a certain incident angle, the blue light is reflected toward the incident direction by tilting the reflective layer 324. Therefore, it does not enter the reflection mirror 60.
  • the second phosphor region 330 is inclined so that the end portion of the base material 322A is thickened.
  • a reflecting member 328 having a height exceeding the phosphor layer 320A may be formed on the side surface of the base material 322.
  • the blue light transmitted through the phosphor layer 320A is reflected by the reflection layer 324, but since the blue light traveling toward the reflection mirror 60 is reflected by the reflection member 328, color mixing with the fluorescent color is prevented. .
  • the reflective region 310 that reflects blue light has a reflective layer 314 formed on the surface of the base material 312 so that the blue light is efficient regardless of the material of the base material 312. Reflected well. Further, as shown in FIG. 7D2, a diffusion region 316 may be formed on the surface of the reflection region 310. Since the blue laser light is coherent light, speckle is generated. In order to remove this, the coherent component can be removed by using a diffusing surface having irregularities. Further, as shown in FIG.
  • the reflecting surface 314 is inclined by providing an inclination so that the thickness of the base material 312A of the reflecting region 310 becomes thinner toward the end portion, so that blue light and phosphor It is possible to prevent color mixing by separating the optical axes of the emission colors as much as possible.
  • the phosphor wheel can be constituted by one or more combinations shown in FIGS. 7 (C1) to (D3).
  • FIG. 8 shows a further modification of the phosphor wheel.
  • a phosphor layer 410 for emitting red, green, yellow, or the like is formed on the phosphor wheel base material 400.
  • the light Lb ′ is reflected by the reflection mirror 40 via the dichroic mirror 30, so that the light in the blue band is mixed with the light in the red band and the green band.
  • a diffused surface 420 having irregularities is formed on the surface of the phosphor layer 410, thereby preventing regular reflection of light in the blue band.
  • an antireflection film 430 for preventing reflection of light in the blue band is formed on the surface of the phosphor layer 410, or as shown in FIG. As described above, it is desirable to form the transparent member 440 having the diffusion surface or the antireflection film formed on the phosphor layer 410.
  • the R and G lights reflected by the dichroic mirror 30 and the B light reflected by the reflecting mirror 40 travel along the same optical path.
  • the optical axis of the reflecting mirror is shifted from the optical axis of the dichroic mirror.
  • the blue band light regularly reflected by the phosphor wheel is the laser light itself, and speckles are generated.
  • the optical axis of the reflection mirror 40 that reflects the light Lb in the blue band is shifted from the optical axis of the dichroic mirror 30, and a speckle removal optical system is provided on the optical path of the blue band light. After passing, they are combined in the same optical path by a dichroic mirror or the like.
  • FIG. 9 is a diagram for explaining the principle of the third embodiment.
  • the reflection mirror 40 is arranged such that its optical axis is shifted from the optical axis of the dichroic mirror 30.
  • the light Lb in the blue band reflected by the reflection mirror 40 is reflected at a right angle by the reflection mirror 510 via the speckle removal optical system 500, and further, the light Lb is reflected by the dichroic mirror 520 at a right angle to collect the light.
  • the light enters the lens L5.
  • the dichroic mirror 520 has the same optical axis as the dichroic mirror 30, and the dichroic mirror 520 transmits the red band light Lr and the green band light Lg reflected by the dichroic mirror 30, and transmits the blue band light Lb. reflect. In this way, the speckle-removed blue band light Lb and the fluorescent lights Lr and Lg are condensed on the light tunnel 70 via the condenser lens L5.
  • the speckle removing optical system 500 is interposed between the reflecting mirror 40 and the reflecting mirror 510, but the speckle removing optical system 500 may be omitted.
  • the reflecting mirror 40 be a diffusing surface, or a surface that reflects light in the blue band of the phosphor wheel be a diffusing surface.
  • FIG. 10 is a diagram illustrating the principle of the illumination optical system 10B according to the third example.
  • the illumination optical system 10B according to the present embodiment includes a dichroic mirror 600 that reflects the laser light Lb in the blue band from the array light source 20 (see FIG.
  • the phosphor wheel 620 includes two wheel members, and one wheel member 620-1 generates light in the blue band, the red band, and the green band, and the other wheel member 620.
  • -2 effectively removes light in the blue band included in the light in the red and green bands that is fluorescently colored by -2. This prevents light in the blue band from being mixed with light in the red and green bands.
  • the blue band laser beam Lb output from the array light source 20 is reflected by the dichroic mirror 600 at a substantially right angle.
  • the laser light Lb in the blue band reflected by the dichroic mirror 600 is shifted from the optical axis of the condenser lens 610 so as to be a shift optical system, and is incident on one half of the condenser lens 610.
  • the incident light Lb is The light is condensed on the phosphor wheel 620.
  • the rotating phosphor wheel 620 is optically scanned with the blue band laser light Lb.
  • the phosphor wheel 620 emits blue band light Lb, red band light Lr, and green band light. Lg is sequentially output.
  • the blue band light Lb regularly reflected by the phosphor wheel 620 is incident on the opposite half of the condensing lens 610 and collected on the dichroic mirror 630.
  • the dichroic mirror 630 reflects the light Lb in the blue band in a substantially right angle direction.
  • the red band and green band lights Lr and Lg that are fluorescently colored by the phosphor wheel 620 are uniformly diffused in a Lambertian pattern and are collected by the condenser lens 610.
  • the condensed lights Lg and Lr are transmitted through the dichroic mirrors 600 and 630 and reflected by the dichroic mirror 640 in a substantially right angle direction.
  • the phosphor wheel 620 includes two first and second wheel members 620-1 and 620-2 that are rotated in synchronization, and both the wheel members are connected by a connecting member 622. Plan views of these wheel members 620-1 and 620-2 are shown in FIGS.
  • the first wheel member 620-1 has substantially the same configuration as the phosphor wheel of the first embodiment, that is, the blue reflection region 620-1B that reflects light in the blue band, the blue band, And a red fluorescent region 620-1R that emits red color light by being excited by the light of the green light, and a green fluorescent region 620-1G that is excited by blue light and emits the green color light by fluorescence. .
  • the second wheel member 620-2 is mounted coaxially with the first wheel member 620-1, and is rotated together with the first wheel member 620-1.
  • the second wheel member 620-2 has a smaller radius (or diameter) than the first wheel member 620-1, and the periphery of the second wheel member 620-2 is the optical axis C1 of the condenser lens 610.
  • the outer diameter of the second wheel member 620 is selected so as not to overlap. If the edge of the second wheel member 620-2 exists on the optical path of the light emitted from the first wheel member 620-1, the edge may be reflected.
  • the second wheel member 620-2 ′ may have its peripheral edge beyond the optical axis C1 of the condensing lens 610.
  • the circumferential portion of the second wheel member 620 includes a transparent region 620-2C that transmits R, G, and B light, and the transparent region 620-2C includes the light Lb in the blue band. And the light Lr and Lg in the red band and the green band that are fluorescently colored by the first wheel member.
  • the second wheel member 620-2 has a blue band at positions corresponding to the blue reflective region 620-1B, red fluorescent region 620-1R, and green fluorescent region 620-1G of the first wheel member 620-1.
  • Blue transmission region 620-2B that transmits light
  • red transmission region 620-2R that reflects light in the blue band and transmits light in the red band
  • green transmission region 620 that reflects light in the blue band and transmits light in the green band -2G is formed.
  • the interior angles of the blue reflective region 620-1B, the red fluorescent region 620-1R, and the green fluorescent region 620-1G are the blue transmissive region 620-2B, the red transmissive region 620-2R, and the green transmissive region 620-2G.
  • the blue band light reflected by the blue reflection area 620-1B is incident on the blue transmission area 620-2B, and the red band light fluorescently developed by the red fluorescence area 620-1R is transmitted through red.
  • the green band light that is incident on the region 620-2R and fluorescently developed in the green fluorescent region 620-1G is incident on the green transmission region 620-2G.
  • P1 on the first wheel member 620-1 represents the spot diameter of the laser light Lb in the blue band collected by the condenser lens 610.
  • P2 on the second wheel member 620-2 in FIG. 11A represents the spot diameter of the light output from the first wheel member 620-1. Since the light Lr and Lg in the red band and the green band are uniformly diffused by fluorescent color development, the diameter of the spot P2 is larger than the spot diameter P2 of the light Lb in the blue band.
  • P3 shown in FIG. 11C represents the blue band light Lb incident from the condenser lens 610 to the second wheel member.
  • the blue transmission region 620-2B may be made of a transparent material that directly transmits the light Lb in the blue band reflected by the first wheel member 620-1, or may be an opening or a through hole.
  • the red transmissive region 620-2R includes an optical filter (for example, a dichroic mirror or a dichroic filter) that transmits fluorescently colored red band light and reflects at least blue band light.
  • the green transmission region 620-2G is configured by an optical filter (for example, a dichroic mirror or a dichroic filter) that transmits the fluorescently colored green band light and reflects at least the blue band light.
  • the second wheel member 620-2 is affixed with an optical film or an optical mirror that transmits light in the red band and the green band on the glass substrate, or such an optical filter on the glass substrate. It can be formed by vapor-depositing the constituent material.
  • the red fluorescent region 620-1R and the green fluorescent region 620-1G fluoresce red band light and green band light excited by the blue band laser light Lb, but the conversion efficiency of the blue band light Lb is 100. %is not. That is, part of the laser light Lb in the blue band is regularly reflected on the surface of the red fluorescent region 620-1R, and further, part of the laser light Lb that has traveled inside the red fluorescent region 620-1R becomes fluorescent. It is reflected from the surface of the red fluorescent region 620-1R without being used. The same applies to the green fluorescent region 620-1G.
  • the fluorescently colored red band light is output from the first wheel member 620-1, the blue band light regularly reflected on the surface thereof and the blue band light not used for the fluorescent color development. Are also output at the same time. Even when the green band light is output, the blue band light regularly reflected on the surface and the blue band light not used for fluorescence development are simultaneously output.
  • FIG. 12 is a graph illustrating blue band light included when green band light is output.
  • the vertical axis represents the light intensity ratio
  • the horizontal axis represents the angle formed with the surface of the phosphor wheel (perpendicular to the surface). Direction is 90 degrees).
  • FIG. 12 shows the light component of the green band when the phosphor wheel includes only the first wheel member, and is output from the phosphor wheel including the second wheel member as in this embodiment. It should be noted that it does not represent the light component of the green band.
  • the light Lg in the green band that is fluorescently developed from the phosphor wheel becomes light that is uniformly diffused in a Lambertian shape, and therefore has little angle dependency.
  • the uniformly diffused green band light Lg is condensed by the condenser lens 610.
  • the undesired blue band light Ln output from the phosphor wheel is converted into a fluorescent color within the fluorescent region and the angle-dependent light component regularly reflected on the surface of the fluorescent region as described above. A synthesis of components of diffused light that were not utilized.
  • the undesired blue band light Ln has an angle-dependent light intensity, that is, a large light intensity in the vicinity of the direction of regular reflection (in the vicinity of an angle of 90 degrees).
  • Lg + Ln represents the intensity when the light of both components is combined.
  • the phosphor wheel 620 includes a second wheel member 620-2 for cutting the blue band light Ln in order to effectively remove such unwanted blue band light Ln.
  • the green band light Lg output from the green fluorescent region 620-1G of the first wheel member 620-1 passes through the green transmission region 620-2G of the second wheel member 620-2, but the green band light.
  • Undesired blue band light Ln included in Lg is reflected by the green transmission region 620-2G.
  • the red band light Lr output from the red fluorescent region 620-1R passes through the red transmission region 620-2R, but the undesired blue band light Ln included in the red band light Lr is red. Reflected by the transmissive region 620-2R.
  • FIG. 13 is a graph showing components of the green band light Lg output from the dichroic mirrors 630 and 640 when the second wheel member 620-2 according to this embodiment is provided.
  • the light intensity of the green band light Lg that is fluorescently colored is almost unchanged, but it is used for the normally reflected light within the range of about 0 to 90 degrees out of the undesired blue band light Ln and the fluorescent color development.
  • the missing light component is removed by the second wheel member 620-2.
  • the undesired blue band light Ln within the range of about 90 to 180 degrees is transmitted through the second wheel member 620-2, but the light is reflected by the dichroic mirror 600 and is dichroic mirror 640. Therefore, the green band light Lg is not mixed.
  • This principle is the same for the red band light Lr. As described above, in this embodiment, it is possible to effectively prevent the light Ln in the undesired blue band from being mixed with the light in the red band and the green band that are fluorescently colored.
  • the function of the second wheel member 620-2 is mainly to prevent color mixing of light in the blue band.
  • the second wheel member can be used for each of R, G, and B at the same time. A function of correcting the color can be provided.
  • the blue transmission region 620-2B formed in the second wheel member 620-2 has been illustrated as having an opening or a through-hole.
  • the blue transmission region 620- 2B includes an optical filter or an optical mirror that transmits the selected wavelength range ⁇ b1 to ⁇ b2 in the blue band.
  • the red transmissive region 620-2R and the green transmissive region 620-2G are configured by optical filters or optical mirrors that transmit the selected wavelength ranges ⁇ r1 to ⁇ r2 and ⁇ g1 to ⁇ g2, respectively. For example, as shown in FIG.
  • the blue transmission region 620-2B selectively transmits the 450 nm band
  • the red transmission region 620-2R selectively transmits the 630 nm band
  • the green transmission region 620-2G It is configured to selectively transmit the 520 nm band. If the phosphor wheel 620 includes a fluorescent region that fluoresces yellow band light, the yellow transmission region of the second wheel member is configured to selectively transmit the 550 nm band.
  • the second wheel member 620-2 is arranged close to the first wheel member 620-1 and arranged on the incident surface side of the condenser lens 610.
  • the member 620-2 may be inserted at any position as long as it is on the optical path of the red band and the green band.
  • FIG. 15 shows an example in which the second wheel member 620-2 is arranged between the condenser lens 610 and the dichroic mirror 630. Also in this case, the first and second wheel members 620-1 and 620-2 are coupled by the connecting member 622 and rotated simultaneously.
  • FIG. 16 shows another configuration example of the illumination optical system of the present embodiment.
  • the second wheel member 620-2 is disposed between the condensing lens 610 and the dichroic mirror 630, the spot diameter of the light incident on the second wheel member 620-2 becomes large, and accordingly. Light loss increases. Therefore, as shown in FIG. 16, the second wheel member 620-2 is disposed between the two condenser lenses 650 and 660, and the spot diameter of the light incident on the second wheel member 620-2 is reduced. By doing so, it becomes possible to suppress the loss of the light amount.
  • FIG. 17 shows another modification of the second wheel member.
  • the second wheel member 620-2 includes a plurality of sets of transmission regions in the radial direction.
  • the first set on the outermost periphery includes the first blue transmission region 620-2B, the green transmission region 620-2G, and the red transmission region 620-2R
  • the second set on the inner periphery is A second blue transmissive region 620-2B ′, a green transmissive region 620-2G ′, and a red transmissive region 620-2R ′ are included.
  • the first set and the second set of transmission regions are configured to select different wavelength bands.
  • the phosphor wheel 620 is movable in the horizontal direction H as shown in FIG. 17B, and when the phosphor wheel 620 is at the position d1, the light emitted from the first wheel member 620-1 is When the first set of transmission regions of the second wheel member 620-2 are irradiated with the spot P2 and the phosphor wheel 620 is at the position d2, the light emitted from the first wheel member 620-1 The second transmission region of the wheel member 620-2 is irradiated with the spot P2 ′. By enabling such switching, it is possible to easily select or fine-tune the colors of R, G, and B.
  • the dichroic mirror 630 is disposed on the front side and the dichroic mirror 640 is disposed on the rear side.
  • this order may be reversed.
  • the illumination optical system according to the fourth embodiment can of course be used in combination with the illumination optical system described in the first to third embodiments.
  • the first wheel member 620-1 reflects the blue band light Lb toward the second wheel member side.
  • the present invention is not limited to this, and the blue band light Lb
  • the first wheel member 620-1 may be transmitted therethrough.
  • the blue reflection region 620-1B of the first wheel member 620-1 is made of a material that transmits the blue band light lb, or a through hole or opening.
  • FIG. 19 shows an illumination optical system when the first wheel member 620-1 transmits the light Lb in the blue band.
  • the blue band light Lb transmitted through the first wheel member 620-1 is extracted in a desired direction by, for example, the total reflection mirror 630A.
  • the phosphor wheel outputs an example of outputting a plurality of lights excited by the laser beam in the blue band (in the above embodiment, the light in the red band and the light in the green band).
  • single light is fluorescently colored by the first wheel member, and a plurality of lights are separated or extracted from the fluorescently colored light by the second wheel member.
  • the first wheel member includes a blue generation region that reflects or transmits the blue band laser light Lb from the array light source, and the yellow band light by being excited by the blue band laser light Lb. And a yellow fluorescent region that fluoresces.
  • a fluorescent substance that develops light in the yellow band has a relatively higher conversion efficiency than a fluorescent substance that develops fluorescence in the red or green band, and thus has an advantage of high output of light in the yellow band.
  • the fluorescent material is not limited to the yellow band, but may be another band, cyan, or magenta.
  • FIG. 20 is a diagram showing an illumination optical system according to the fifth embodiment of the present invention.
  • the phosphor wheel 720 includes the first wheel member 720-1 that outputs a single fluorescent color, and a plurality of single fluorescent colors. And a second wheel member 720-2 for separating or extracting light in the wavelength band.
  • FIG. 20B is a partially enlarged view of the phosphor wheel 720, and the first and second wheel members 720-1 and 720-2 each have substantially the same diameter.
  • the rotation center of the phosphor wheel is C6, the radius from the center C6 to the edge of the first and second wheel members 720-1 and 720-2 is r1, and the light Lb in the blue band passes through the first wheel member 720-1.
  • the radius from the approximate center of the spot diameter to the rotation center C6 when irradiated is r2, and the radius from the rotation center C6 to the edge of the region for selecting the wavelength of the second wheel member 720-2 is r3.
  • Reference numeral 722 denotes a connecting member for the first and second wheel members 720-1 and 720-2.
  • FIG. 21A is a plan view of the first wheel member
  • FIG. 20B is a plan view of the second wheel member.
  • the first wheel member 720-1 is formed with a blue reflective region 720-1B that reflects blue band light and a yellow fluorescent region 720-1Y that is excited by the blue band light and emits yellow band light. Is done. Accordingly, the laser light Lb from the array light source 20 optically scans the blue reflection region 720-1B and the yellow fluorescent region 720-1Y of the rotated first wheel member 720-1, and the first wheel member 720 is scanned. From -1, blue band light and yellow band light are sequentially output.
  • the second wheel member 720-2 includes a blue transmission region 720-2B that transmits the blue band light from the array light source and the blue band light from the blue reflection region 720-1B, and the yellow band light to the red band light.
  • a red generation region 720-2R that generates light and a green generation region 720-2G that generates light in the green band from light in the yellow band are included.
  • the blue transmission region 720-2B is made of, for example, an opening or a through hole, or a transparent material that transmits at least light in the blue band.
  • the red color generation region 720-2R includes at least two regions having different characteristics. That is, the red generation region 720-2R is configured by an optical filter that transmits blue band light in the region between r1 and r2 and transmits red band light included in the yellow band, and is a region between r2 and r3. Is configured by an optical filter that reflects light in the blue band, reflects light in the green band included in the yellow band, and transmits light in the red band included in the yellow band.
  • the green generation region 720-2G includes an optical filter that transmits blue band light in the region between r1 and r2 and transmits green band light included in the yellow band, and blue in the region between r2 and r3.
  • the optical filter reflects light in the band, reflects light in the red band included in the yellow band, and transmits light in the green band included in the yellow band.
  • the fifth embodiment it is possible to obtain R, G, and B light using a fluorescent material having a high intensity of fluorescent color and having little color mixing.
  • the fifth embodiment of the present invention can be combined with the first to fourth embodiments, and the technique described therein can be applied.
  • the illumination optical system 10D of the present embodiment includes front group lenses L1 and L2 that condense blue band laser light Lb as excitation light emitted from an array light source (see FIG. 2), and front group lenses L1 and L2.
  • a first beam splitter BS1 that transmits part of the laser beam Lb collected by the laser beam and reflects the remainder in a right angle direction, and a first dichroic mirror that transmits blue band light and reflects at least red band light.
  • a condenser lens L3 that transmits part of the laser light Lb reflected by the first beam splitter BS1, and reflects the rest in a right angle direction, and light in the blue band and red
  • a second dichroic mirror 830 that transmits light in the band and reflects light in the green band
  • a condenser lens L4 and transmits light in the blue band and light in the red band and green band.
  • the front group lens L1 is composed of, for example, a convex lens
  • the front group lens L2 is composed of, for example, a concave lens
  • the front group lenses L1, L2 condense the laser beam Lb from the array light source into parallel light.
  • the optical axis C1 of the front group lenses L1 and L2 is the center of the lenses L1 and L2.
  • two combination lenses are used as the front group lens.
  • the front group lens only needs to be an optical system capable of condensing the laser light Lb from the array light source, and constitutes the front group lens.
  • the number of lenses may be one, or three or more.
  • the front lens group may be composed of either a spherical lens or an aspheric lens.
  • the front lens group may include an optical member such as a prism.
  • the first beam splitter BS1 is disposed on the optical axis C1, transmits a part of the laser light Lb, for example, 1/3 light in the direction of the optical axis C1, and transmits the remaining 2/3 light to the optical axis. Reflects in a direction perpendicular to C1.
  • the first dichroic mirror 20 is disposed on the optical axis C1, and transmits the laser light Lb transmitted through the first beam splitter BS1 in the direction of the optical axis C1.
  • the first dichroic mirror 820 reflects the light in the red band emitted by the phosphor wheel 860 in the direction of the optical axis C4 orthogonal to the optical axis C1.
  • the condenser lens L3 is disposed between the first dichroic mirror 820 and the phosphor wheel 860, and the center of the condenser lens L3 coincides with the optical axis C1.
  • the condensing lens L3 condenses the laser light Lb transmitted through the first dichroic mirror 820 on the phosphor wheel 860. Further, the red band light Lr emitted by the phosphor wheel 860 is condensed on the first dichroic mirror 820.
  • the condensing lens L3 is configured by using one lens, but the condensing lens L3 condenses the laser light Lb on the phosphor wheel 860 and is emitted from the phosphor wheel 860.
  • the number of lenses constituting the condenser lens L3 may be a plurality of combination lenses.
  • the condensing lens L3 may be composed of either a spherical lens or an aspheric lens.
  • the condensing lens may include an optical member such as a prism.
  • the second beam splitter BS2 is disposed on the optical axis C3 orthogonal to the optical axis C1, and a part of the laser light Lb reflected by the first beam splitter BS1, for example, 1/3 light is applied to the optical axis C3. And the remaining 2/3 of the light is reflected in a direction orthogonal to the optical axis C3.
  • the second dichroic mirror 830 is disposed on the optical axis C4, transmits the laser light Lb reflected by the second beam splitter BS2 in a direction orthogonal to the optical axis C4, and reflects by the first dichroic mirror 820.
  • the red light Lr thus transmitted is transmitted in the direction of the optical axis C4.
  • the second dichroic mirror 830 reflects the light in the green band emitted by the phosphor wheel 860 in the direction of the optical axis C4.
  • the condenser lens L4 is disposed between the second dichroic mirror 830 and the phosphor wheel 860, and the optical axis C2 of the condenser lens L4 is the center of the condenser lens L4.
  • the optical axis C2 is parallel to the optical axis C1.
  • the condensing lens L4 condenses the laser light Lb transmitted through the second dichroic mirror 830 on the phosphor wheel 860, and the green band light Lg emitted by the phosphor wheel 860 is on the second dichroic mirror 830.
  • the condensing lens L4 is configured by using one lens, but the condensing lens L4 condenses the laser light Lb on the phosphor wheel 860 and has a green band from the phosphor wheel 860.
  • Any optical system that can collect the light Lg may be used, and the number of lenses constituting the condenser lens L4 may be a plurality of combination lenses.
  • the condensing lens L4 may be constituted by either a spherical lens or an aspheric lens.
  • the condensing lens may include an optical member such as a prism.
  • the reflection mirror 850 reflects the red band light Lr transmitted through the second dichroic mirror 30 and the green band light Lg reflected by the second dichroic mirror 830 in a direction orthogonal to the optical axis C4.
  • the third dichroic mirror 840 is disposed on the optical axis C3, transmits the laser light Lb transmitted through the second beam splitter BS2 in the direction of the optical axis C3, and is reflected by the reflection mirror 850 and is reflected in the red band and the green band. Are reflected in the direction of the optical axis C3.
  • R, G, and B light is extracted from the third dichroic mirror 840, and white light can be obtained by synthesizing the light.
  • the white light emitted from the third dichroic mirror 840 is then separated into R, G, and B, and can be used, for example, as a light source for a liquid crystal projector.
  • R / G / B light is extracted in the direction of the optical axis C3. However, in the direction orthogonal to the optical axis C3 using an optical member such as a mirror, or any other direction. R / G / B light can be extracted.
  • the phosphor wheel 860 is disposed at a position facing the condenser lenses L4 and L5, and emits light in the red band and the green band when irradiated with the blue laser light Lb.
  • the surface of the phosphor wheel 860 is excited by the blue band laser light and emits red band light, and the annular first phosphor region 862R is excited by the blue band laser light and emits the green band light.
  • An annular second phosphor region 862G that emits light is formed.
  • the first and second phosphor regions 862R and 862B are arranged concentrically, and in the example shown in the figure, the first phosphor region 862R is formed on the outer peripheral side with respect to the second phosphor region 862G. This relationship may be the opposite.
  • the first phosphor region 862R has a constant width in the radial direction, and preferably the center of the radial width coincides with the optical axis C1.
  • the condensing lens L3 adjusts the size of the spot P of the laser light Lb so that the laser light Lb in the blue band falls within the width of the first phosphor region 862R.
  • the second phosphor region 862G has a constant width in the radial direction, and preferably the center of the radial width coincides with the optical axis C2.
  • the condenser lens L4 adjusts the size of the spot Q of the laser beam Lb so that the laser beam Lb in the blue band falls within the width of the second phosphor region 862G.
  • the phosphor wheel 860 is rotated at a constant speed by the drive motor 870, and the first and second phosphor regions 862R and 862G are optically continuously scanned by the spots P and Q.
  • the first phosphor region 862R emits red band light Lr excited by the laser light Lb in a Lambertian shape (uniform diffusion).
  • the emitted light Lr is condensed on the first dichroic mirror 820 by the condenser lens L3, and is reflected in the direction of the optical axis C4 orthogonal to the optical axis C1.
  • the second phosphor region 862G emits the green band light Lg excited by the laser light Lb in a Lambertian shape (uniform diffusion).
  • the emitted light Lg is condensed by the condenser lens L4 onto the second dichroic mirror 830, where it is reflected in the direction of the optical axis C4 orthogonal to the optical axis C2.
  • Examples of the phosphor material constituting the first and second phosphor regions 862R and 862G include YAG (yttrium, aluminum, garnet), TAG (terbium, aluminum, garnet), sialon, BOS (barium Orthosilicate) and nitride compounds are known.
  • the first and second phosphor regions 862R and 862G are, for example, sheet-like ones obtained by applying a mixture of a phosphor material and a resin material or a ceramic material on the surface of the base material, or mixing a phosphor material. And may be affixed to the substrate surface.
  • FIG. 23A is a plan view of the phosphor wheel
  • FIG. 23B is a cross-sectional view of the phosphor wheel taken along the line XX. Circles indicated by P and Q in the figure represent spots of light Lb in the blue band collected by the condenser lenses L3 and L4.
  • the phosphor wheel 860 includes a reflective layer 864 that reflects light in the blue band, the red band, and the green band on the surface of the disc-shaped support substrate 866, and first and second phosphors formed on the reflective layer 864. Regions 862R and 862G.
  • the material of the support substrate 866 is not particularly limited, and is made of, for example, a metal material, a resin material, a glass material, or the like. Note that since the temperature of the phosphor wheel 860 is increased by irradiation with the laser light Lb, the support substrate 866 desirably has a material or a shape excellent in heat dissipation characteristics.
  • the support substrate 866 is preferably circular, but is not necessarily limited to such a shape, and may be, for example, a polygonal or elliptical shape.
  • the phosphor material When the first phosphor region 862R is irradiated with the laser light Lb, the phosphor material is excited by the laser light Lb, and the red band light Lr is emitted. Since the red band light Lr isotropically diffuses in a Lambertian shape from the light emitting point, a part of the light travels toward the support substrate 866. However, since such light Lr is reflected by the reflective layer 864 without being transmitted to the back side of the phosphor wheel 860, the red band light Lr can be efficiently extracted. Similarly, the green band light Lg emitted from the second phosphor region 862B is also reflected by the reflective layer 864, so that the green band light Lg can be efficiently extracted.
  • a part of the light Lb in the blue band does not contribute to wavelength conversion of the red band and the green band in the first and second phosphor regions 862R and 862G, and the first and second phosphor regions 862R, Some of them pass through 862G.
  • Such transmitted laser light Lb is reflected by the reflective layer 864 and returned again to the first and second phosphor regions 862R and 862G, and is used for wavelength conversion. Can be improved.
  • an antireflection film that prevents reflection of light in the blue band Lb on the entire surface of the phosphor wheel 860 or on the first and second phosphor regions 862R and 862G. 868 can be formed.
  • the light Lb in the blue band is suppressed from being reflected from the surfaces of the first and second phosphor regions 862R and 862G, and the conversion efficiency by the phosphor can be improved.
  • the light in the red band and the green band can be generated using the light in the blue band emitted from the array light source.
  • the light subjected to wavelength conversion can be light in the yellow band or other bands.
  • the blue band light Lb is laser light itself and coherent light, speckles are generated.
  • an optical member such as a diffusion plate can be installed on the optical path of the laser beam in the blue band.
  • the diffusing plate includes, for example, a diffusing surface having irregularities formed on the surface, and can remove or alleviate the coherent component.
  • a diffusion surface can be formed on the surface of the first beam splitter, or a speckle removal optical system can be added on the optical path of the laser light Lb.
  • the blue band to be divided by adding a beam splitter or the like it is possible to further increase the number of the light beams Lb (for example, four) and increase the number of spots P and Q. In this case, it is necessary to add an optical system for collecting R and G light emitted by irradiation of the added spots P and Q.
  • the phosphor material of the phosphor wheel 860 is heat or the like. Therefore, the irradiation energy of one spot can be reduced and the life of the phosphor wheel can be improved by increasing the number of divisions of the laser beam Lb.
  • the phosphor wheel 860 is configured to reflect the light in the red band and the green band excited by the light in the blue band from the incident surface side.
  • 10E is configured to emit red band and green band light excited by blue band light from the exit surface side.
  • the same components as those shown in FIG. 22 are denoted by the same reference numerals, and the description thereof is omitted.
  • the surface of the phosphor wheel 860A is irradiated with the laser light Lb in the blue band by the condenser lens L3.
  • the laser light Lb is incident on the first phosphor region 862R formed on the emission surface side of the phosphor wheel 860A, and excites the red band light there.
  • red band light Lr is emitted in a Lambertian shape from the emission surface side of the phosphor wheel 860A.
  • the blue band light condensed by the condenser lens L4 irradiates the second phosphor region 862G, and the green band light excited by the second phosphor region 862G is emitted from the phosphor wheel 860A. The light is emitted from the surface side.
  • FIG. 25 is a schematic sectional view showing the structure of the phosphor wheel according to the eighth embodiment.
  • the phosphor wheel 860A transmits the blue band light and reflects the red band and green band light, and the first and second phosphor regions 862R and 862G formed on the back surface of the dichroic mirror 864A. And have.
  • the blue band light Lb is incident on the first phosphor region 862R via the dichroic mirror 864A, and the red band light Lr excited there is emitted from the emission surface side of the phosphor wheel 860A.
  • a part of the red band light Lr is reflected by the dichroic mirror 864A and emitted from the emission surface side of the phosphor wheel 860A.
  • the light in the green band excited by the second phosphor region 862G is extracted from the emission surface side of the phosphor wheel 860A.
  • the red band light Lr emitted from the emission surface side of the phosphor wheel 860A is collected by the condenser lens L5 and then reflected in the optical axis C4 direction by the reflection mirror 820A that reflects at least the red band light. .
  • the reflection mirror 820A may be composed of a dichroic mirror as in the sixth embodiment.
  • the green band light Lb emitted from the emission surface side of the phosphor wheel 860A is collected by the condenser lens L6 and then reflected by the second dichroic mirror 830 in the direction of the optical axis C4.
  • the third dichroic mirror 840 emits R / G / B light in the direction of the optical axis C3.
  • FIG. 26 Another method for separating laser light is shown in FIG.
  • the laser light is separated by the beam splitter, but the laser light can be separated by using other optical systems.
  • the two convex lenses 900 and 910 are arranged so that the optical axes are parallel to the optical axis C, and the laser light Lb. Is incident on one half of each of the lenses 900 and 910.
  • the laser beam Lb is condensed by the lenses 900 and 910, respectively, and separated into the laser beams Lb1 and Lb2. If the sizes of the lenses 900 and 910 are the same and the lenses 900 and 910 are arranged symmetrically with respect to the optical axis C, the laser beam Lb is separated into 1 ⁇ 2 laser beams Lb1 and Lb2, respectively.
  • the present invention is not limited to such an illumination optical system. That is, as shown in FIG. 27, the illumination optical system 10F of the present invention may be configured to extract R, G, and B light individually.
  • the first dichroic mirror 820 rotates the direction in FIG. 22 by 180 degrees. Therefore, the red band light Lr emitted from the phosphor wheel 860 is reflected by the first dichroic mirror 820 in the direction of the optical axis C4. That is, the light Lr in the red band is reflected in a direction 180 degrees opposite to that in FIG. Further, as shown in FIG. 27, if the reflection mirror 850 and the third dichroic mirror 840 are omitted, the light Lb in the blue band and the light Lg in the green band can be extracted individually.
  • the individually extracted blue band light Lb, red band light Lr, and green band light Lg may be obtained using an optical system such as a lens, mirror, or prism. It is possible to be directed in the direction of or to synthesize their light.
  • the phosphor wheel 860 / 860A is formed with the first and second phosphor regions 862R and 862G for emitting light in the red band and the green band, but is excited by the blue laser light.
  • the light subjected to wavelength conversion is not necessarily limited to light in the red band and green band.
  • it may include a phosphor layer that excites light in the yellow, magenta, and cyan bands.
  • a dichroic mirror is synonymous with a dichroic filter
  • a reflective layer, a reflective mirror, and an antireflection film are synonymous with a reflective member, a reflective filter, and the like.
  • the illumination optical system according to the present invention can be applied to light sources of various electronic devices.
  • a light source such as a projector, a rear projector, an endoscope, and an illumination device.
  • 10, 10A, 10B, 10C illumination optical system
  • 20 array light source
  • 30, 30A dichroic mirror
  • 40 reflection mirror
  • 50, 50A phosphor wheel
  • 52, 82 reflection region
  • 54, 84 phosphor Region (R)
  • 56, 86 Phosphor region (G)
  • 60 Motor
  • 70 Light tunnel
  • 200 Beam splitter
  • 210 Reflecting mirror
  • L3, L4 Rear group lens
  • L5 condenser lens
  • 312, 322 base material
  • 316 diffusing surface
  • 324, 314 reflective layer
  • 326 dichroic mirror
  • 328 reflective member
  • 610 condenser lens
  • 620 fluorescence Body wheel
  • 620-1B Blue reflection region
  • 620-1R Red fluorescence region
  • 620-1G Green fluorescence region
  • 620-2 second wheel member
  • 620-2B blue transmission region
  • 620-2R red transmission region

Abstract

La présente invention porte sur un système optique d'éclairage comprenant : une source (20) de lumière en réseau qui émet une lumière bleue ; une roue (50) à luminophore qui comprend une région (52) réfléchissante qui réfléchit une lumière bleue et une première région (54) de luminophore qui émet une lumière rouge et une seconde région (56) de luminophore qui émet une lumière verte sur la base de la lumière bleue ; un miroir (30) dichroïque que traverse la lumière bleue provenant de la source (20) de lumière en réseau et qui réfléchit la lumière rouge et la lumière verte provenant de la roue (50) à luminophore ; un miroir (40) réfléchissant qui réfléchit la lumière bleue provenant de la roue (50) à luminophore ; des lentilles (L1, L2) de groupe avant comprenant un axe (C1) optique et collectant la lumière bleue provenant de la source (20) de lumière en réseau ; et des lentilles (L3, L4) de groupe arrière comprenant un axe (C2) optique décalé de l'axe (C1) optique et collectant une lumière bleue provenant des lentilles (L1, L2) de groupe avant sur la surface de la roue (50) à luminophore.
PCT/JP2014/050155 2013-01-10 2014-01-08 Dispositif de conversion de longueur d'onde, système optique d'éclairage et dispositif électronique l'utilisant WO2014109333A1 (fr)

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JP2019139205A (ja) * 2018-02-09 2019-08-22 パナソニックＩｐマネジメント株式会社 蛍光体ホイール、光源装置、および投写型映像表示装置
JP2019526154A (ja) * 2016-08-04 2019-09-12 深▲せん▼光峰科技股▲分▼有限公司Ａｐｐｏｔｒｏｎｉｃｓ Ｃｏｒｐｏｒａｔｉｏｎ Ｌｉｍｉｔｅｄ 発光装置及び投影システム
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