WO2015104801A1 - 光源装置および投写型表示装置 - Google Patents
光源装置および投写型表示装置 Download PDFInfo
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- WO2015104801A1 WO2015104801A1 PCT/JP2014/050112 JP2014050112W WO2015104801A1 WO 2015104801 A1 WO2015104801 A1 WO 2015104801A1 JP 2014050112 W JP2014050112 W JP 2014050112W WO 2015104801 A1 WO2015104801 A1 WO 2015104801A1
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- light
- wavelength
- light source
- source device
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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
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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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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- 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
Definitions
- the present invention relates to a light source device including a fluorescent unit that emits light having a second wavelength different from the light having the first wavelength in response to irradiation with light having the first wavelength, and a projection type having the light source device.
- the present invention relates to a display device.
- a projection display device that modulates light emitted from a light source device into image light using a display panel and projects the image light is known.
- a light source device for such a projection display device As a light source device for such a projection display device, a light source device having a high-intensity discharge lamp, a light source device having a solid-state light source that emits visible light of a single wavelength, such as an LED (Light Emitting Diode) or a semiconductor laser. It is used. Solid light sources have a smaller influence on the natural environment than discharge lamps, and for these reasons, light source devices equipped with solid light sources are attracting attention.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2010-237443
- Patent Document 2 International Publication No. 2012/127554
- Patent Document 1 discloses a light source device that includes a light source body that emits blue laser light and a fluorescent unit that is disposed on a traveling path of the blue laser light, and a dichroic mirror is provided between the light source body and the fluorescent unit. It is disclosed.
- Patent Document 2 discloses a light source device that includes a light source body that emits blue laser light, a fluorescent unit that is disposed on a traveling path of the blue laser light, a dichroic mirror, and a quarter-wave plate. Yes.
- the dichroic mirror is provided between the light source body and the fluorescent unit, and the quarter wavelength plate is provided between the fluorescent unit and the dichroic mirror.
- the light source device disclosed in Patent Document 1 and the light source device disclosed in Patent Document 2 can emit light of a plurality of colors in the same direction without using a discharge lamp.
- the light source device disclosed in Patent Document 1 since the fluorescent unit passes a part of the light emitted from the light source body, a reflection mirror must be provided on the traveling path of the light after passing through the fluorescent unit. I must. Therefore, the light source device is increased in size with respect to the direction of light irradiation to the fluorescent unit.
- the dichroic mirror must have a characteristic that separates the fluorescent unit from S-polarized light and P-polarized light having a specific wavelength (for example, around 450 nm which is the blue wavelength band). I must. It is very difficult to manufacture a dichroic mirror having such characteristics, and the dichroic mirror is quite expensive. This increases the cost of the light source device.
- An example of the object of the present invention is to provide a light source device that can be reduced in size with respect to the direction of light irradiation to the fluorescent unit and that is lower in cost.
- One aspect of the present invention includes a light source body, an optical element, a fluorescent unit, and a light collecting element.
- the light source body emits light having a first wavelength.
- the optical element is provided on the traveling path of the light having the first wavelength emitted from the light source body.
- the optical element transmits light having the first wavelength and reflects light having a second wavelength different from the first wavelength.
- the fluorescent unit includes a reflective region that reflects light and a fluorescent region that emits light of a second wavelength in response to irradiation with light of the first wavelength.
- the fluorescence unit is provided so that the light of the 1st wavelength which permeate
- the condensing element converts light having the second wavelength emitted from the fluorescent region into parallel light and collects light having the second wavelength reflected by the optical element.
- the optical axis of the light source body and the optical axis of the condensing element are shifted.
- the reflection direction of the first wavelength light in the reflection region intersects the incident direction of the first wavelength light to the reflection region.
- the fluorescent region is in the direction opposite to the incident direction of the light of the first wavelength to the reflection region and in the reflection direction of the light of the first wavelength in the reflection region. Emits light with a wavelength of 2.
- the fluorescent region can reflect light having the second wavelength incident on the fluorescent region.
- the reflection direction of the second wavelength light in the optical element is the same as the direction of the first wavelength light transmitted through the optical element.
- the size of the fluorescent unit can be reduced and the cost can be reduced.
- FIG. 1 is a schematic top view of a light source device according to this embodiment.
- the light source device 1 according to this embodiment includes a light source body 2, an optical element 3, a fluorescent unit 4, a reflection mirror 5, and a rod integrator 6.
- the light source body 2 emits light of the first wavelength.
- the light having the first wavelength is, for example, laser light having a wavelength of 450 nm.
- the light having the first wavelength is not limited to laser light having a wavelength of 450 nm, and may be laser light having a wavelength of 410 nm or 460 nm, for example.
- Blue semiconductor laser light sources can emit such laser light and are readily available.
- the blue semiconductor laser light source as the light source body 2 emits light that spreads at a predetermined angle.
- the collimator lens 7 By providing the collimator lens 7 on the traveling path of the light emitted from the light source body 2, the spread of the light emitted from the light source body 2 is suppressed, and a parallel light beam is formed.
- the lens system for converting the light from the light source body 2 into a parallel light bundle is configured by one plano-convex lens, but the lens system is configured by using a plurality of lenses. It may be.
- the optical element 3 transmits light having a first wavelength (for example, blue light) and reflects light having a second wavelength (for example, green or red light) different from the light having the first wavelength.
- the optical element 3 is formed by vapor-depositing a dielectric multilayer film that reflects light in the green or red wavelength band and transmits light in the blue wavelength band on a transparent glass plate.
- FIG. 2 is a graph showing the characteristics of the optical element 3, that is, the characteristics of the dielectric multilayer film deposited on the glass plate.
- the horizontal axis indicates the wavelength, and the vertical axis indicates the transmittance.
- Such a dielectric multilayer film is generally used in a liquid crystal projector or the like and is easily available.
- the optical element 3 having the characteristics shown in FIG. 2 is also called a dichroic mirror.
- the optical element 3 is provided on a traveling path of light emitted from the light source body 2. Therefore, the first wavelength light emitted from the light source body 2 passes through the optical element 3 and travels toward the fluorescent unit 4.
- Lenses 8 and 9 are disposed between the optical element 3 and the fluorescent unit 4.
- Optical glass or optical resin can be used as the material of the lenses 8 and 9.
- Lenses 8 and 9 form a condensing element 10 that collects light rays. Specifically, when diverging light is incident on the condensing element 10, the condensing element 10 converts the diverging light into parallel light parallel to the optical axis 11 of the condensing element 10. Further, when parallel light enters the light collecting element 10, the light collecting element 10 collects the parallel light at a certain point on the optical axis 11 of the light collecting element 10.
- the condensing element 10 may be comprised from 1 or 3 or more lenses.
- the condensing element 10 may be formed using a lens having a surface other than a spherical surface, for example, an aspherical surface or a free curved surface.
- the optical axis of the light source body 2, that is, the optical axis of the first wavelength light transmitted through the optical element 3, and the optical axis 11 of the condensing element 10 are shifted. Therefore, the light having the first wavelength transmitted through the optical element 3 enters the light collecting element 10 at a position away from the optical axis 11 of the light collecting element 10. Then, the light having the first wavelength transmitted through the optical element 3 is refracted toward the optical axis 11 in the light condensing element 10 and travels toward the fluorescent unit 4.
- Fluorescent unit 4 includes a glass plate having a circular shape.
- FIG. 3 is a front view of the fluorescent unit 4. As shown in FIG. 3, the fluorescent unit 4 includes fluorescent regions 12 and 13 and a reflective region 14.
- the fluorescence unit 4 is provided so that the first wavelength light transmitted through the optical element 3 is sequentially irradiated to the fluorescence regions 12 and 13 and the reflection region 14.
- the fluorescent unit 4 is connected to the motor 15. As the motor 15 operates, the fluorescent unit 4 rotates around the rotation axis of the motor 15. The fluorescent regions 12 and 13 and the reflective region 14 are arranged in the rotation direction of the fluorescent unit 4. Therefore, when the fluorescent unit 4 rotates, the light having the first wavelength transmitted through the optical element 3 is sequentially irradiated onto the fluorescent regions 12 and 13 and the reflective region 14.
- the reflection area 14 reflects light incident on the reflection area 14. Therefore, the light having the first wavelength irradiated on the reflection region 14 is reflected by the reflection region 14 as the light having the first wavelength.
- the fluorescent unit 4 is provided so that the reflection direction of the light of the first wavelength in the reflection region 14 intersects the incident direction of the light of the first wavelength to the reflection region 14.
- the reflection region 14 has a planar shape, and the fluorescent unit 4 is arranged so that the direction of light having the first wavelength incident on the reflection region 14 is inclined with respect to the normal of the reflection region 14. .
- the light of the first wavelength reflected in the reflection region 14 travels to the reflection mirror 5 through the condensing element 10.
- the fluorescent regions 12 and 13 emit light having a second wavelength (for example, green or red light) different from the light having the first wavelength in response to irradiation with light having the first wavelength (for example, blue light).
- the fluorescent regions 12 and 13 are formed by fixing a phosphor that emits fluorescence in response to the irradiation of blue laser light in a predetermined region of a glass plate.
- the fluorescent region 12 is a green fluorescent region formed by fixing a phosphor that emits green fluorescence in response to irradiation with blue laser light on a glass plate.
- the fluorescent region 13 is a red fluorescent region formed by fixing a phosphor that emits red fluorescence in response to irradiation with blue laser light on a glass plate.
- the light emitted from the phosphor is divergent light. Therefore, the light of the second wavelength emitted from the fluorescent regions 12 and 13 in response to the irradiation of the light of the first wavelength is at least opposite to the incident direction of the light of the first wavelength to the reflection region 14. The light travels in the first direction and the second direction that is the same as the reflection direction of the first wavelength light in the reflection region.
- the light having the second wavelength emitted from the fluorescent regions 12 and 13 is converted into parallel light by the light collecting element 10 and travels toward the optical element 3 and the reflecting mirror 5. Since the optical element 3 has a characteristic of reflecting the light having the second wavelength (see FIG. 2), the light having the second wavelength toward the optical element 3 is reflected by the optical element 3.
- the optical element 3 is arranged such that the reflection direction of the second wavelength light in the optical element 3 is the same as the direction of the first wavelength light transmitted through the optical element 3. Therefore, the light having the second wavelength reflected by the optical element 3 travels to the light collecting element 10.
- the light having the second wavelength reflected by the optical element 3 is parallel light. Therefore, the condensing element 10 guides the light of the second wavelength to the fluorescent regions 12 and 13 while converging the light of the second wavelength.
- the fluorescent regions 12 and 13 can diffusely reflect light having the second wavelength incident on the fluorescent regions 12 and 13. Part of the light having the second wavelength irregularly reflected in the fluorescent regions 12 and 13 travels in the first direction, and the other part travels in the second direction. The part of the light is reflected by the optical element 3 and enters the fluorescent regions 12 and 13 again.
- the fluorescent regions 12 and 13 may be capable of specularly reflecting light having the second wavelength incident on the fluorescent regions 12 and 13. In other words, the fluorescent regions 12 and 13 only need to be able to reflect light having the second wavelength incident on the fluorescent regions 12 and 13.
- the reflection mirror 5 is a very general member having a characteristic of reflecting visible light.
- the reflection mirror 5 is manufactured by evaporating aluminum, chromium, silver or the like on a plate-like member.
- the optical element 3 is disposed only on the incident position side of the light having the first wavelength to the condensing element 10 with respect to the optical axis 11 of the condensing element 10. Moreover, it is preferable that the reflecting mirror 5 is disposed only on the side opposite to the incident position with respect to the optical axis 11 of the light collecting element 10.
- the light having the first and second wavelengths traveling from the fluorescent unit 4 to the reflection mirror 5 is reflected by the reflection mirror 5 and travels to the rod integrator 6.
- Lenses 16 and 17 are disposed between the reflection mirror 5 and the rod integrator 6, and a diffusion unit 18 is disposed between the rod integrator 6 and the lens 16.
- Lenses 16 and 17 form a lens system that collects light directed to the rod integrator 6 on the incident surface of the rod integrator 6.
- Optical glass or optical resin can be used as the material of the lenses 16 and 17.
- the lens system that collects light in the rod integrator 6 may be composed of one or three or more lenses.
- the lens system may be formed using a surface other than a spherical surface, for example, a lens having an aspherical surface or a free-form surface.
- the rod integrator 6 is a member having a prism shape. Optical glass or optical resin can be used as the material of the rod integrator 6.
- a member also called a light tunnel in which four reflecting mirrors are combined may be used instead of the rod integrator 6.
- an integrator composed of two fly-eye lenses can be used instead of the rod integrator 6, an integrator composed of two fly-eye lenses can be used.
- the lens system that collects light in the integrator is configured using at least one lens having a shape different from the shape of the lenses 16 and 17.
- the diffusion unit 18 includes a transparent plate (for example, a glass plate) having a circular shape.
- FIG. 4 is a front view of the diffusion unit 18. As shown in FIG. 4, the diffusion unit 18 includes a transmission region 19 and a diffusion region 20.
- the transmission region 19 allows the irradiated light to pass through without diffusing.
- the diffusion region 20 allows the irradiated light to pass through while diffusing.
- the diffusion unit 18 is provided so that light emitted from the lens 17 is sequentially irradiated to the transmission region 19 and the diffusion region 20.
- the diffusion unit 18 is connected to the motor 21.
- the motor 21 When the motor 21 operates, the diffusion unit 18 rotates around the rotation axis of the motor 21.
- the transmission region 19 and the diffusion region 20 are aligned in the rotation direction of the diffusion unit 18. Accordingly, when the diffusion unit 18 rotates, the light emitted from the lens 17 is sequentially applied to the transmission region 19 and the diffusion region 20.
- FIG. 5 is a schematic diagram of a projection display device including the light source device 1. As shown in FIG. 5, the projection display device includes a TIR (Total Internal Reflector) prism 22, a display panel 23, a projection lens 24, and lenses 25 and 26.
- TIR Total Internal Reflector
- the TIR prism 22 is provided on a path of light emitted from the rod integrator 6, emits light from the rod integrator 6 toward the display panel 23, and directs light from the display panel 23 toward the projection lens 24. And exit.
- DMD Digital Micromirror Device
- the display panel 23 When DMD is used, the light needs to be directed at the DMD at a specific angle.
- TIR prism 22 it becomes possible to irradiate the DMD with light at a specific angle.
- the TIR prism 22 is very commonly used in a projection display device having a DMD.
- Lenses 25 and 26 are arranged on the path of light emitted from the rod integrator 6.
- the lenses 25 and 26 form an image of the exit surface of the rod integrator 6 on the display panel 23.
- the number and shape of the lenses 25 and 26 are appropriately changed according to the area of the exit surface of the rod integrator 6.
- the light emitted from the light source device 1 is modulated into an image using the display panel 23 and guided to the projection lens 24.
- the projection lens 24 projects light, the image is displayed in an enlarged manner.
- FIGS. 3, 4, 6 and 7. are diagrams for explaining a light path in the light source device 1.
- the first wavelength light 27 (blue laser light) emitted from the light source body 2 is substantially collimated by the collimator lens 7 and reaches the optical element 3. Since the optical element 3 has a characteristic of transmitting the light 27 having the first wavelength (see FIG. 2), the light 27 having the first wavelength passes through the optical element 3 and travels toward the condensing element 10.
- the light 27 having the first wavelength transmitted through the optical element 3 is located away from the optical axis 11 of the condensing element 10. Is incident on the condensing element 10 and refracted by the condensing element 10. As a result, the direction of the first wavelength light 27 incident on the fluorescent unit 4 through the light collecting element 10 is inclined with respect to the incident surface of the fluorescent unit 4.
- the fluorescent regions 12 and 13 are positioned on the path of the light 27 having the first wavelength, or the reflection region 14 has the light 27 having the first wavelength. Since the operation of the light source device 1 is different depending on whether it is located on the path of FIG.
- the reflection region 14 Since the reflection region 14 is located on the path of the light 27 having the first wavelength, the light 27 having the first wavelength is reflected by the fluorescent unit 4. Since the direction of the first wavelength light 27 incident on the reflection region 14 is inclined with respect to the incident surface of the fluorescent unit 4, the first wavelength light 27 reflected by the reflection region 14 is directed to the reflection region 14. The light travels in a direction intersecting with the incident direction of the light 27 having the first wavelength toward the light collecting element 10.
- the light 27 having the first wavelength incident on the condensing element 10 is refracted by the condensing element 10 and travels toward the reflecting mirror 5.
- the light 27 having the first wavelength reflected by the reflection mirror 5 reaches the diffusion unit 18 via the lenses 16 and 17.
- the diffusion unit 18 rotates corresponding to the rotation of the fluorescent unit 4. Specifically, when the reflection region 14 is positioned on the travel path of the first wavelength light 27 incident on the fluorescent unit 4, the first wavelength light 27 incident on the diffusion unit 18 travels on the travel path. The rotation of the diffusion unit 18 is controlled so that the diffusion region 20 is located. Therefore, the first wavelength light 27 incident on the diffusion unit 18 diffuses in the diffusion region 20 and enters the rod integrator 6.
- the light 27 having the first wavelength incident on the rod integrator 6 is repeatedly reflected in the rod integrator 6 to be emitted as a uniform light beam and emitted from the rod integrator 6 to irradiate an optical component such as the display panel 23 (see FIG. 5). Is done.
- the fluorescent regions 12 and 13 are positioned on the path of the light 27 having the first wavelength incident on the fluorescent unit 4, the light 27 having the first wavelength is irradiated onto the fluorescent regions 12 and 13. As a result, the fluorescent regions 12 and 13 emit light 28 having a second wavelength different from the first wavelength.
- the fluorescent region 12 emits green fluorescence
- the fluorescent region 13 emits red fluorescence.
- the light 28 having the second wavelength is drawn with a broken line in order to distinguish it from the light 27 having the first wavelength.
- the fluorescent regions 12 and 13 that emit the light 28 having the second wavelength in response to the irradiation with the light 27 having the first wavelength are also considered as secondary light sources having the light source body 2 as an excitation source. Then, the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 travels in the four directions from the irradiation position of the light 27 having the first wavelength, in particular, spreading toward the light collecting element 10 side.
- the light 28 having the second wavelength incident on the condensing element 10 is converted into parallel light by using the condensing element 10 and travels toward the optical element 3 and the reflecting mirror 5.
- the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 the light directed to the reflection mirror 5 (hereinafter, the light is referred to as “light 28 a”) is reflected by the reflection mirror 5, and the lenses 16, 17 and reach the diffusion unit 18.
- the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 the light toward the optical element 3 (hereinafter, the light is referred to as “light 28 b”) is reflected by the optical element 3. Since the reflection direction of the light of the second wavelength in the optical element 3 is the same as the direction of the light of the first wavelength transmitted through the optical element 3, the light of the second wavelength reflected by the optical element 3 is again the condensing element. Head to 10.
- the light 28b incident on the light collecting element 10 again travels to the fluorescent unit 4 and reaches the fluorescent regions 12 and 13. Since the light 28b incident on the fluorescent regions 12 and 13 is diffusely reflected in the fluorescent regions 12 and 13, the light 28b travels toward the light collecting element 10 again. That is, the fluorescent regions 12 and 13 function as a secondary light source that emits light in response to the irradiation of the light 28b.
- a part of the light 28b irradiated to the fluorescent regions 12 and 13 travels along the traveling path of the light 28a and travels toward the rod integrator 6.
- the light toward the optical element 3 out of the light 28b irradiated to the fluorescent regions 12 and 13 is irradiated again to the fluorescent regions 12 and 13.
- the rod integrator 6 By repeating the reflection at the optical element 3 and the irradiation to the fluorescent regions 12 and 13, most of the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 is directed to the rod integrator 6.
- the diffusion unit 18 rotates corresponding to the rotation of the fluorescent unit 4. Specifically, when the fluorescent regions 12 and 13 are located on the traveling path of the light 27 having the first wavelength incident on the fluorescent unit 4, the transmission region 19 is disposed on the traveling path of the light 28 a incident on the diffusion unit 18. The rotation of the diffusion unit 18 is controlled so that is positioned. Therefore, the light 28 a incident on the diffusion unit 18 passes through the transmission region 19 and enters the rod integrator 6.
- Lights 27 and 28 having the first and second wavelengths incident on the rod integrator 6 are repeatedly reflected in the rod integrator 6 to become uniform light beams and are emitted from the rod integrator 6, and are displayed on the display panel 23 (see FIG. 5).
- the optical parts are irradiated.
- the light source device 1 does not pass through the fluorescent unit 4. Therefore, the light source device 1 does not require a reflecting mirror on the side of the fluorescent unit 4 opposite to the side irradiated with light. As a result, the light source device 1 can be reduced in size with respect to the irradiation direction of the light to the fluorescent unit 4.
- the light source device 1 since the reflection direction of the first wavelength light 27 in the reflection region 14 intersects the incident direction of the first wavelength light 27 to the reflection region 14, the first wavelength light 27. Therefore, a dichroic mirror for separating the S-polarized light component and the P-polarized light component is not required. Therefore, the light source device 1 can be manufactured with a less expensive member, and the cost of the light source device is suppressed.
- the light 28b that travels toward the light source body 2 out of the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 is incident on the fluorescent regions 12 and 13 again using the optical element 3, more second light is emitted. Can be directed in the same direction as the light 27 having the first wavelength.
- the present embodiment since the present embodiment includes the condensing element 10 that converts the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 into parallel light, most of the light 28 having the second wavelength is included. It goes to the optical element 3 and the reflection mirror 5. As a result, the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 is hardly lost, and the light 28 having the brighter second wavelength is emitted in the same direction as the light 27 having the first wavelength. It becomes possible.
- the diffusion region 20 diffuses the laser light, speckle noise of the light having the first wavelength is greatly reduced. Therefore, since the image is projected using light that hardly contains speckle noise, the quality of the projected image is improved.
- the diffusion unit 18 since the diffusion unit 18 is rotating, the portion irradiated with the light of the first wavelength changes with time in the diffusion region 20. Therefore, speckle is greatly reduced.
- the design position of the rod integrator 6 can be freely changed.
- the diffusing unit 18 may be located on the path of light emitted from the rod integrator 6.
- FIG. 8 is a schematic top view of the light source device according to this embodiment.
- the direction of the first wavelength light transmitted through the optical element 3 is substantially the same as the direction of the first wavelength light emitted from the light source body 2. Intersects vertically.
- the light source device 29 includes an optical path conversion element 30 that guides the light having the first wavelength emitted from the light source body 2 to the optical element 3.
- the light source device 29 does not include the reflection mirror 5 shown in FIG. Therefore, the light travels straight from the fluorescent unit 4 to the rod integrator 6.
- the light source body 2 emits light of the first wavelength.
- the light having the first wavelength emitted from the light source body 2 is converted into substantially parallel light by using the collimator lens 7.
- the light having the first wavelength emitted from the collimator lens 7 enters the optical path conversion element 30 and is emitted from the optical path conversion element 30 toward the optical element 3.
- the optical axis of the light source body 2 includes the optical axis of the light emitted from the optical path conversion element 30.
- a right triangle prism can be used as the optical path conversion element 30.
- Optical glass right-angled triangular prisms can be obtained relatively inexpensively and relatively easily.
- a reflection mirror may be used as the optical path conversion element 30.
- the optical element 3 is separated from the optical path conversion element 30, but the optical element 3 may be disposed close to the optical path conversion element 30 or bonded to the optical path conversion element 30.
- a dichroic film having the characteristics shown in FIG. 2 may be deposited on the exit surface of the optical path conversion element 30.
- the optical axis of the light source body 2 and the optical axis 11 of the light collecting element 10 are shifted. Therefore, the light having the first wavelength transmitted through the optical element 3 enters the light collecting element 10 at a position away from the optical axis 11 of the light collecting element 10. The light having the first wavelength transmitted through the optical element 3 is refracted toward the optical axis 11 in the light condensing element 10 and travels toward the fluorescent unit 4.
- the optical element 3 and the optical path conversion element 30 are disposed only on the incident position side of the light having the first wavelength to the condensing element 10 with respect to the optical axis 11 of the condensing element 10.
- the structures and operations of the light condensing element 10, the fluorescent unit 4, the lenses 16, 17, the diffusing unit 18 and the rod integrator are the same as those in the first embodiment, and thus the description thereof is omitted here.
- FIGS. 3, 4, 9 and 10 are diagrams for explaining a light path in the light source device 29.
- the first wavelength light 27 (blue laser light) emitted from the light source body 2 is substantially collimated by the collimator lens 7 and then reaches the optical path conversion element 30. .
- the light 27 having the first wavelength incident on the optical path conversion element 30 is emitted toward the optical element 3.
- the optical element 3 Since the optical element 3 has a characteristic of transmitting the light 27 having the first wavelength (see FIG. 2), the light 27 having the first wavelength passes through the optical element 3 and travels toward the condensing element 10.
- the light 27 having the first wavelength transmitted through the optical element 3 is located away from the optical axis 11 of the condensing element 10. Is incident on the condensing element 10 and refracted by the condensing element 10. As a result, the incident direction of the first wavelength light 27 on the fluorescent unit 4 is inclined with respect to the incident surface of the fluorescent unit 4.
- the fluorescent regions 12 and 13 are positioned on the path of the light 27 having the first wavelength, or the reflection region 14 has the light 27 having the first wavelength. Since the operation of the light source device 1 is different depending on whether it is located on the path of FIG.
- the reflection region 14 Since the reflection region 14 is located on the path of the light 27 having the first wavelength, the light 27 having the first wavelength is reflected by the fluorescent unit 4. Since the incident direction of the first wavelength light 27 to the reflection region 14 is inclined with respect to the incident surface of the fluorescent unit 4, the first wavelength light 27 reflected by the reflection region 14 is incident on the reflection region 14. The light travels in the direction intersecting with the incident direction of the light 27 having the first wavelength and travels toward the light collecting element 10.
- the light 27 having the first wavelength incident again on the condensing element 10 is refracted by the condensing element 10 and reaches the diffusion unit 18 via the lenses 16 and 17.
- the diffusion unit 18 rotates corresponding to the rotation of the fluorescent unit 4. Therefore, the light 27 having the first wavelength emitted from the lens 16 is diffused in the diffusion region 20 of the diffusion unit 18 and enters the rod integrator 6.
- the fluorescent regions 12 and 13 are positioned on the path of the light 27 having the first wavelength incident on the fluorescent unit 4, the light 27 having the first wavelength is irradiated onto the fluorescent regions 12 and 13. As a result, the fluorescent regions 12 and 13 emit light 28 having a second wavelength different from the first wavelength. In this embodiment, the fluorescent region 12 emits green fluorescence, and the fluorescent region 12 emits red fluorescence.
- the light 28 having the second wavelength is drawn with a broken line in order to distinguish it from the light 27 having the first wavelength.
- the fluorescent regions 12 and 13 that emit the light 28 having the second wavelength in response to the irradiation with the light 27 having the first wavelength are also considered as secondary light sources having the light source body 2 as an excitation source. Then, the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 travels in the four directions from the irradiation position of the light 27 having the first wavelength, in particular, spreading toward the light collecting element 10 side.
- the light 28 having the second wavelength incident on the condensing element 10 is converted into parallel light by using the condensing element 10 and travels toward the optical element 3 and the lens 16.
- the light 28 a traveling toward the lens 16 reaches the diffusion unit 18 via the lenses 16 and 17.
- the light 28 b toward the optical element 3 is reflected by the optical element 3. Since the reflection direction of the second wavelength light in the optical element 3 is the same as the direction of the first wavelength light 27 transmitted through the optical element 3, the light 28 b reflected by the optical element 3 travels again to the condensing element 10. .
- the light 28b incident on the light collecting element 10 again travels to the fluorescent unit 4 and reaches the fluorescent regions 12 and 13. Since the light 28b incident on the fluorescent regions 12 and 13 is diffusely reflected in the fluorescent regions 12 and 13, the light 28b travels toward the light collecting element 10 again. That is, the fluorescent regions 12 and 13 function as a secondary light source that emits light in response to the irradiation of the light 28b.
- a part of the light 28b irradiated to the fluorescent regions 12 and 13 travels along the traveling path of the light 28a and travels toward the rod integrator 6.
- the light toward the optical element 3 out of the light 28b irradiated to the fluorescent regions 12 and 13 is irradiated again to the fluorescent regions 12 and 13.
- the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 passes through the lenses 16 and 17 and diffuses. Head to 18.
- the diffusion unit 18 rotates corresponding to the rotation of the fluorescent unit 4, the light 28 having the second wavelength incident on the diffusion unit 18 passes through the transmission region 19 and enters the rod integrator 6.
- Lights 27 and 28 having the first and second wavelengths incident on the rod integrator 6 are repeatedly reflected in the rod integrator 6 to become uniform light beams and are emitted from the rod integrator 6, and are displayed on the display panel 23 (see FIG. 5).
- the optical parts are irradiated.
- the light 27 having the first wavelength emitted from the light source body 2 does not pass through the fluorescent unit 4. Therefore, the light source device 29 does not require a reflection mirror on the side of the fluorescent unit 4 opposite to the side irradiated with light. As a result, the light source device 29 can be reduced in size with respect to the irradiation direction of the light to the fluorescent unit 4.
- the light source device 29 has the first wavelength light 27 because the reflection direction of the first wavelength light 27 in the reflection region 14 intersects the incident direction of the first wavelength light 27 to the reflection region 14. Therefore, a dichroic mirror for separating the S-polarized light component and the P-polarized light component is not required. Therefore, the light source device 29 can be manufactured with a less expensive member, and the cost of the light source device 29 is suppressed.
- the light 28b that travels toward the light source body 2 out of the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 is incident on the fluorescent regions 12 and 13 again using the optical element 3, more second light is emitted. Can be directed in the same direction as the light 27 having the first wavelength.
- the present embodiment since the present embodiment includes the condensing element 10 that converts the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 into parallel light, most of the light 28 having the second wavelength is included. It goes to the optical element 3 and the lens 16. As a result, the light 28 having the second wavelength emitted from the fluorescent regions 12 and 13 is hardly lost, and the light 28 having the brighter second wavelength is emitted in the same direction as the light 27 having the first wavelength. It becomes possible.
- FIG. 11 is a schematic top view of the light source device according to this embodiment. As shown in FIG. 11, the light source device 31 according to the present embodiment includes a separation unit 32 instead of the diffusion unit 18 shown in FIG.
- FIG. 12 is a front view of the fluorescent unit 4 included in this embodiment.
- the fluorescent unit 4 according to this embodiment includes a fluorescent region 33 that emits light in a yellow wavelength band in response to irradiation with light of the first wavelength, and a reflective region 14.
- the fluorescent region 33 is formed by fixing a phosphor that emits light in a yellow wavelength band in response to irradiation with light of the first wavelength in a predetermined region of the glass plate.
- FIG. 13 is a front view of the separation unit 32 included in this embodiment.
- the separation unit 32 corresponds to the fluorescence unit 4 including the fluorescence region 33 (see FIG. 12), the green light transmission region 34, the red light transmission region 35, the diffusion region 36, including.
- the green light transmission region 34 has a characteristic of passing only light in the green wavelength band among the light in the yellow wavelength band, and the red light transmission region 35 transmits only light in the red wavelength band in the light in the yellow wavelength band. Has the property of passing.
- the green light transmission region 34 and the red light transmission region 35 are formed by depositing a dielectric multilayer film on a glass plate under predetermined conditions. Formation of a dielectric multilayer film and vapor deposition of the dielectric multilayer film on a glass plate are well-known techniques used when forming a dichroic mirror.
- the fluorescent unit 4 is controlled so that the fluorescent region 33 of the fluorescent unit 4 is positioned on the path of the first wavelength light emitted from the light source body 2. Further, the separation unit 32 is controlled so that the green light transmission region 34 of the separation unit 32 is positioned on the path of the light incident on the rod integrator 6 or emitted from the rod integrator 6.
- the fluorescent unit 4 is controlled so that the fluorescent region 33 of the fluorescent unit 4 is positioned on the path of the first wavelength light emitted from the light source body 2. Further, the separation unit 32 is controlled so that the red light transmission region 35 of the separation unit 32 is positioned on the path of the light incident on the rod integrator 6 or the light emitted from the rod integrator 6.
- the fluorescent unit 4 is controlled so that the reflection region 14 of the fluorescent unit 4 is positioned on the path of the first wavelength light emitted from the light source body 2. Further, the separation unit 32 is controlled so that the diffusion region 36 of the separation unit 32 is positioned on the path of the light incident on the rod integrator 6 or the light emitted from the rod integrator 6.
- the display panel 23 (see FIG. 5) is irradiated with green, red, and blue light.
- Such control is possible by providing a position sensor or the like in the fluorescence unit 4 and the separation unit 32.
- Such control can be realized by applying a technique used in a well-known projection display device using a color wheel.
- only one light source body 2 is provided.
- a plurality of light source bodies 2 may be arranged.
- the phosphor emits more fluorescence as the intensity of excitation light that excites the phosphor increases. Therefore, by increasing the number of light source bodies 2 and increasing the intensity of light of the first wavelength, it is possible to obtain a light source device and a projection display device with higher luminance.
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Abstract
Description
まず、第1の実施形態例に係る光源装置について、図1ないし図4を用いて説明する。図1は、本実施形態例に係る光源装置の概略上面図である。図1に示すように、本実施形態例に係る光源装置1は、光源本体2と、光学素子3と、蛍光ユニット4と、反射ミラー5と、ロッドインテグレーター6を備える。
次に、本発明の第2の実施形態例に係る光源装置について、図8を用いて説明する。なお、第1の実施形態例の構成要素と同一の要素については同一の符号を付し、その説明を省略する。
続いて、本発明の第3の実施形態例に係る光源装置について、図11ないし図13を用いて説明する。なお、第1,2の実施形態例の構成要素と同一の要素については同一の符号を付し、その説明を省略する。
2 光源本体
3 光学素子
4 蛍光ユニット
5 反射ミラー
6 ロッドインテグレーター
7 コリメーターレンズ
8 レンズ
9 レンズ
10 集光素子
11 光軸
12 蛍光領域
13 蛍光領域
14 反射領域
15 モーター
16 レンズ
17 レンズ
18 拡散ユニット
19 透過領域
20 拡散領域
21 モーター
22 TIRプリズム
23 表示パネル
24 投写レンズ
25 レンズ
26 レンズ
27 第1の波長の光
28 第2の波長の光
29 光源装置
30 光路変換素子
31 光源装置
32 分離ユニット
33 蛍光領域
34 緑色光透過領域
35 赤色光透過領域
36 拡散領域
37 レンズ
38 レンズ
Claims (8)
- 第1の波長の光を発する光源本体と、
前記光源本体から発せられた前記第1の波長の光の進行経路上に設けられ、該第1の波長の光を透過させるとともに該第1の波長と異なる第2の波長の光を反射する光学素子と、
光を反射する反射領域と、前記第1の波長の光の照射に応じて前記第2の波長の光を発する蛍光領域と、を含み、前記光学素子を透過した前記第1の波長の光が前記反射領域および前記蛍光領域に順次照射されるように設けられた蛍光ユニットと、
前記蛍光領域から発せられた前記第2の波長の光を平行光に変換するとともに、前記光学素子において反射した前記第2の波長の光を集める集光素子と、備え、
前記光源本体の光軸と、前記集光素子との光軸と、がシフトしており、
前記反射領域における前記第1の波長の光の反射方向が、前記反射領域への前記第1の波長の光の入射方向と交わっており、
前記蛍光領域は、前記第1の波長の光の照射に応じて前記入射方向とは反対の方向および前記反射方向に前記第2の波長の光を発するとともに、該蛍光領域に入射する前記第2の波長の光を反射可能であり、
前記光学素子における前記第2の波長の光の反射方向は、該光学素子を透過した前記第1の波長の光の向きと同じである、光源装置。 - 請求項1に記載の光源装置において、
前記光学素子は、前記集光素子の光軸よりも、前記集光素子への前記第1の波長の光の入射位置側にのみ配置されている、光源装置。 - 請求項1または2に記載の光源装置において、
前記反射領域において反射した前記第1の波長の光の進行経路上に設けられた反射ミラーをさらに備える、光源装置。 - 請求項1ないし3のいずれか1項に記載の光源装置において、
前記蛍光領域は、前記第1の波長の光の照射に応じて緑色の蛍光を発する緑色蛍光領域と、前記第1の波長の光の照射に応じて赤色の蛍光を発する赤色蛍光領域と、を含む、光源装置。 - 請求項1ないし4のいずれか1項に記載の光源装置において、
前記反射領域において反射された前記第1の波長の光を拡散させる拡散ユニットをさらに備える、光源装置。 - 請求項1ないし3のいずれか1項に記載の光源装置において、
前記第2の波長の光は黄色の波長帯域の光であり、
前記光源装置は、前記黄色の波長帯域の光のうち緑色の波長帯域の光のみを透過させる緑色光透過領域と、前記黄色の波長帯域の光のうち赤色の波長帯域の光のみを透過させる赤色光透過領域と、を含む分離ユニットをさらに備え、
前記分離ユニットは、前記蛍光ユニットから発せられた前記黄色の波長帯域の光が前記緑色光透過領域と前記赤色光透過領域とに順次照射されるように設けられている、光源装置。 - 請求項6に記載の光源装置において、
前記分離ユニットが、前記反射領域において反射された前記第1の波長の光を拡散させる拡散ユニットをさらに備える、光源装置。 - 請求項1ないし9のいずれか1項に記載の光源装置と、
前記光源装置から出射される光を用いて画像を形成する表示パネルと、を備えた、投写型表示装置。
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