WO2011118536A1

WO2011118536A1 - Projection image display device and light source device

Info

Publication number: WO2011118536A1
Application number: PCT/JP2011/056613
Authority: WO
Inventors: 前田　誠; 松本　慎也; 金山　秀行
Original assignee: 三洋電機株式会社
Priority date: 2010-03-25
Filing date: 2011-03-18
Publication date: 2011-09-29
Also published as: JP2011221502A

Abstract

Disclosed is a light source device which maintains illumination colour balance and light intensity without requiring widespread system changes from a light source lamp, and a projection image display device using same. A light source device (10) comprises: an exciting laser light source which is a solid state light source (50); a fluorescent body (60) which is excited by ultraviolet light contained in laser light output by the exciting laser light source and emits light in the visible range; a reflector (56) to reflect light emitted by the fluorescent body (60) and output same in a specified direction; and a fluorescent body mount (62) which positions the fluorescent body (60) at the focal position of the reflector (56). The fluorescent body mount (62) is provided with a reflecting mirror (61) in order to effectively guide light emitted by the fluorescent body (60) to the reflective surface of the reflector (56).

Description

Projection-type image display device and light source device

The present invention relates to a projection display apparatus and a light source apparatus.

2. Description of the Related Art In projection display devices such as projectors, light source lamps such as thermoluminescent halogen lamps, discharge ultra-high pressure mercury lamps and metal halide lamps are widely used as light source devices. For example, in an ultra-high pressure mercury lamp, a shape in which an arc tube and a reflector that reflects light emitted from the arc tube is combined is used in order to efficiently propagate light to an irradiated surface.

As light emission characteristics of such a light source lamp, it is generally desired that the color balance in the visible wavelength region is good and the light intensity is high. However, although the ultra high pressure mercury lamp has a relatively high light intensity, its emission characteristic has an emission spectrum unique to mercury, and is red (hereinafter referred to as R), green (hereinafter referred to as G), and blue. Of the wavelength range of colored light (hereinafter referred to as B), the light intensity in the wavelength range of R light tends to be insufficient. For this reason, there is a problem that illumination light having a good color balance in the visible wavelength region cannot be obtained.

Therefore, as a countermeasure for enhancing the R light, for example, Japanese Patent Application Laid-Open No. 2007-156270 (Patent Document 1) discloses a light source that emits light including visible light and ultraviolet light, a reflector that reflects the light emitted from the light source, and A plurality of filters that individually transmit light of a plurality of colors including red are provided in the circumferential direction, the rotation axis is shifted from the optical axis, and the light emitted from the light source is rotated sequentially. A light source device including a color wheel to be illuminated is disclosed. In the light source device of Patent Document 1, the color wheel includes a phosphor layer that fluoresces ultraviolet light into light of each color at least at a part of a portion irradiated with light from each filter, and emits from the light source. The color balance is adjusted by superimposing the R light converted from the ultraviolet light by the phosphor layer on the visible light of each color.

JP 2007-156270 A

However, the light source device described in Patent Document 1 increases the component of each color by superimposing the visible light of each color, which has been wavelength-converted from ultraviolet light, on the light emitted from the ultra-high pressure mercury lamp as the light source lamp. Therefore, a high voltage power source for driving the ultra high pressure mercury lamp is required. In addition, the light source device is desired to have a long life and a short time until lighting.

To deal with these problems, it is considered to use a solid light source such as a light emitting diode as a light source. A major system change from the projector is required.

In addition, the light source device described in Patent Document 1 rotates a disk-shaped color wheel around a rotation axis parallel to the optical axis of the light source, and therefore is perpendicular to the optical axis to accommodate the color wheel. It is necessary to ensure a certain height in any direction, and there is a restriction on downsizing of the entire apparatus.

Further, the excitation efficiency of the phosphor (= the conversion efficiency that is emitted as a fluorescence spectrum by converting the wavelength of the excitation spectrum to the phosphor) is the difference between the wavelength of the excitation light of the phosphor and the wavelength of the emitted light of the phosphor. However, in the light source device described in Patent Document 1, the wavelength difference between the ultraviolet light that is the excitation light and the R light that is the light emitted from the phosphor layer is different from the ultraviolet light and the G light or B light. Since it becomes larger than the wavelength difference from light, it is difficult to obtain high efficiency.

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve such a problem, and an object of the present invention is to provide a light source device capable of ensuring the color balance and light amount of illumination light without a significant system change from the light source lamp. And a projection display apparatus including the same.

Another object of the present invention is to provide a high-efficiency and high-luminance light source device and a projection-type image display device including the same while achieving miniaturization.

According to one aspect of the present invention, a projection display apparatus is modulated by a light source device, a light modulation unit that modulates light emitted from the light source device based on an input video signal, and a light modulation unit. A projection unit for projecting light. The light source device includes a solid-state light source, a phosphor that is excited by light emitted from the solid-state light source and emits light in a visible range, a reflector that reflects the light emitted from the phosphor and emits the light in a predetermined direction, And a phosphor installation section that installs the phosphor at the focal position of the reflector. The phosphor installation part has a reflection part for guiding the light emitted from the phosphor to the reflection surface of the reflector.

Preferably, the light source device further includes an irradiation position moving mechanism for continuously moving the irradiation position of the light emitted from the solid light source to the phosphor.

Preferably, the irradiation position moving mechanism is attached to the phosphor installation part, and rotates the phosphor installation part around the rotation axis and the rotation axis parallel to the optical axis of the reflector, so that the light emitted from the solid light source A rotation mechanism for moving the irradiation position on the phosphor on a circumference around the rotation axis. The phosphor has a light incident surface in which a plurality of light emitting portions that emit different color lights are arranged in order along a circumferential direction around the rotation axis.

Preferably, the solid light source comprises at least one light source. The at least one light source is arranged on the apex side of the reflector or the opening side of the reflector, and emits light toward the inside of the reflector.

Preferably, the light source device further includes a light condensing member for condensing the light emitted from the solid light source on the phosphor.

According to another aspect of the present invention, a light source device includes a solid-state light source, a phosphor that is excited by light emitted from the solid-state light source, and emits light in the visible range, and reflects light emitted from the phosphor to give a predetermined light source. A reflector for emitting light in the direction of, and a phosphor installation portion that installs the phosphor at the focal position of the reflector. The phosphor installation part has a reflection part for guiding the light emitted from the phosphor to the reflection surface of the reflector.

According to another aspect of the present invention, a projection display apparatus is modulated by a light source device, a light modulation unit that modulates light emitted from the light source device based on an input video signal, and a light modulation unit. A projection unit for projecting the light. The light source device is provided on a solid light source, a rotating body whose axis of rotation is orthogonal to the optical axis of the solid light source, and an outer peripheral surface of the rotating body. And a phosphor that emits light.

Preferably, the rotating body includes a cylindrical translucent substrate that is driven to rotate about the rotation axis. The phosphor is disposed on the outer peripheral surface of the translucent substrate so as to have a predetermined angle range in the circumferential direction. The light source device is disposed on the inner peripheral surface of the translucent substrate at a position facing the phosphor, and reflects the light emitted from the phosphor toward the outside in the radial direction of the rotating body, and the solid light source emits the light. A dichroic film that transmits light is further included.

Preferably, the phosphor includes a plurality of fluorescent portions that are arranged in parallel along the rotation axis direction and that receive light emitted from the solid-state light source and emit a plurality of colored lights respectively. The plurality of fluorescent portions are arranged on the outer peripheral surface of the translucent substrate so as to have different angular ranges in the circumferential direction when viewed from the rotation axis direction.

Preferably, the rotating body includes a cylindrical translucent substrate that is driven to rotate about the rotation axis. A fluorescent substance is arrange | positioned over the whole outer peripheral surface of a translucent base material. The light source device further includes a reflective film that is disposed over the entire inner peripheral surface of the translucent substrate and reflects the light emitted by the phosphor toward the outside in the radial direction of the rotating body.

Preferably, the phosphor includes a plurality of fluorescent portions that are arranged side by side along the circumferential direction and emit light of a plurality of color lights in response to light emitted from the solid light source. The plurality of fluorescent portions are arranged on the outer peripheral surface of the translucent substrate so as to have different angular ranges in the circumferential direction.

According to another aspect of the present invention, a light source device is provided on a solid light source, a rotating body whose axis of rotation is orthogonal to the optical axis of the solid light source, and an outer peripheral surface of the rotating body, and the solid light source emits the light source device. And a phosphor that emits light in the visible range when excited by the emitted light.

According to the present invention, the light source device is configured such that the phosphor as the light emitting unit converts the light from the solid light source into visible light, while maintaining the shape of the light source lamp including the combination of the light emitting unit and the reflector. The casing and system of the projection display apparatus equipped with the light source lamp can be shared. Therefore, a significant system change from a projection display apparatus equipped with a light source lamp becomes unnecessary.

In addition, since a desired emission color can be obtained by excitation of the phosphor, the light source device can easily emit illumination light with good color balance. Furthermore, since the light emitted from the phosphor can be efficiently guided to the reflecting surface of the reflector, the light utilization efficiency of the light source device can be increased.

In addition, according to the present invention, it is possible to realize a light source device with high efficiency and high brightness and a projection type video display device including the same while achieving miniaturization.

It is a figure which shows typically the structure of the principal part of the projector which concerns on Embodiment 1 of this invention. It is a figure explaining the structure of the light source device in FIG. It is a figure which shows the structure of a general light source lamp. It is a figure explaining the structure of the light source device which concerns on Embodiment 2 of this invention. It is a figure explaining the structure of the light source device which concerns on the modification 1 of Embodiment 2 of this invention. It is a figure explaining the structure of the light source device which concerns on the modification 2 of Embodiment 2 of this invention. It is a figure explaining the structure of the light source device which concerns on Embodiment 3 of this invention. It is a figure explaining the structure of the light source device which concerns on the modification 1 of Embodiment 3 of this invention. It is a figure explaining the structure of the light source device which concerns on the modification 2 of Embodiment 3 of this invention. It is a figure explaining the structure of the light source device which concerns on Embodiment 4 of this invention. It is a figure explaining the structure of the fluorescent substance seen from the optical axis direction. It is a figure explaining the structure of the projector carrying the light source device which concerns on Embodiment 5 of this invention. It is a figure explaining the structure of the light source device which concerns on Embodiment 6 of this invention. It is a figure explaining the structure of the fluorescent substance seen from the optical axis direction. It is a figure explaining the structure of the optical engine of the light source device according to Embodiment 7 of this invention, and the projector carrying the said light source device. It is a figure explaining the structure of the light source device which concerns on the example of a change of Embodiment 7 of this invention. It is a figure which shows typically the structure of the principal part of the projector which concerns on Embodiment 8 of this invention. It is a figure explaining the structure of the light source device in FIG. It is a figure explaining the structure of the rotary body in FIG. It is a figure explaining the structure of the optical engine which concerns on Embodiment 9 of this invention. It is a figure explaining the structure of the light source device in FIG. It is sectional drawing for every rotation ring which used the surface perpendicular | vertical to the arrangement direction of a rotation ring as a cut surface. It is sectional drawing for every rotation ring. It is sectional drawing for every rotation ring. It is a figure explaining the structure of the optical engine which concerns on the example of a change of Embodiment 9 of this invention. It is a figure explaining the structure of the light source device in FIG. It is a figure explaining the structure of the optical engine which concerns on Embodiment 10 of this invention. It is a figure explaining the structure of the rotary body in FIG. It is a figure explaining the structure of the rotary body with which the light source device which concerns on the example of a change of Embodiment 10 of this invention is provided. It is a figure which shows typically the structure of the principal part of a projector using the light source device which concerns on Embodiment 11 of this invention for the light source system. It is sectional drawing for every rotation ring which used the surface perpendicular | vertical to the arrangement direction of a rotation ring as a cut surface. It is a figure explaining the structure of the rotary body with which the light source device which concerns on the example of a change of Embodiment 11 of this invention is provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
FIG. 1 is a diagram schematically showing a configuration of a main part of a projection display apparatus (hereinafter also referred to as “projector”) according to Embodiment 1 of the present invention.

Referring to FIG. 1, the projector is a liquid crystal projector that projects an image using a liquid crystal device, and includes an optical engine 2 and a projection lens 3, and the outline is covered with a cavity (not shown). ing. The projector is also equipped with components for outputting sound such as a speaker, a circuit board for electrically controlling the components of the optical engine 2 and the sound output means, but in FIG. The illustration of some components including these is omitted.

The optical engine 2 includes a light source device 10. The light source device 10 includes a solid light source 50, a phosphor 60 that emits light when excited by light from the solid light source 50, and a reflector 56 that reflects light emitted from the phosphor 60. The light source device 10 is mounted in a detachable state with respect to the cavity. The light emitted from the phosphor 60 is emitted as a substantially parallel light in a predetermined direction by the action of the reflector 56.

The light from the light source device 10 enters a PBS (polarized beam splitter) array 12 and a condenser lens 13 via a fly eye integrator 11. The fly-eye integrator 11 includes a fly-eye lens composed of a lens group having an eyelet shape. The fly-eye integrator 11 applies light to the light incident from the light source device 10 so that the light quantity distribution of the light incident on the

liquid crystal panels

18, 24, 33 is uniform. Add optical action.

The PBS array 12 has a plurality of PBSs and half-wave plates arranged in an array, and aligns the polarization direction of the light incident from the fly eye integrator 11 in one direction. The condenser lens 13 condenses light incident from the PBS array 12. The light transmitted through the condenser lens 13 enters the dichroic mirror 14.

The dichroic mirror 14 transmits only light in the blue wavelength range (hereinafter referred to as “B light”) out of the light incident from the condenser lens 13, and light in the red wavelength range (hereinafter referred to as “R light”) and Reflects light in the green wavelength range (hereinafter referred to as “G light”). The B light transmitted through the dichroic mirror 14 is guided to the mirror 15, reflected there, and incident on the condenser lens 16.

The condenser lens 16 imparts an optical action to the B light so that the B light enters the liquid crystal panel 18 as substantially parallel light. The B light transmitted through the condenser lens 16 is incident on the liquid crystal panel 18 via the incident side polarizing plate 17. The liquid crystal panel 18 is driven according to the blue video signal, and modulates the B light according to the driving state. The B light modulated by the liquid crystal panel 18 is incident on the dichroic prism 20 via the emission side polarizing plate 19.

G light out of the light reflected by the dichroic mirror 14 is reflected by the dichroic mirror 21 and enters the condenser lens 22. The condenser lens 22 imparts an optical action to the G light so that the G light enters the liquid crystal panel 24 as substantially parallel light. The G light transmitted through the condenser lens 22 is incident on the liquid crystal panel 24 through the incident side polarizing plate 23. The liquid crystal panel 24 is driven according to the green video signal and modulates the G light according to the driving state. The G light modulated by the liquid crystal panel 24 is incident on the dichroic prism 20 via the output side polarizing plate 25.

The R light transmitted through the dichroic mirror 21 is incident on the condenser lens 26. The condenser lens 26 imparts an optical action to the R light so that the R light enters the liquid crystal panel 33 as substantially parallel light. The R light transmitted through the condenser lens 26 travels on an optical path composed of

relay lenses

27, 29, 31 for adjusting the optical path length and the two

mirrors

28, 30, and is incident on the liquid crystal panel 33 through the incident side polarizing plate 32. The The liquid crystal panel 33 is driven according to the video signal for red and modulates the R light according to the drive information. The R light modulated by the liquid crystal panel 33 is incident on the dichroic prism 20 via the emission side polarizing plate 34.

The dichroic prism 20 color-synthesizes the B light, G light, and R light modulated by the

liquid crystal panels

18, 24, 33 and makes the light enter the projection lens 3. The projection lens 3 adjusts the zoom state and the focus state of the projected image by displacing a part of the lens group for forming an image of the projection light on the projection surface (screen) and in the optical axis direction. An actuator is provided. The light synthesized by the dichroic prism 20 is enlarged and projected on the screen by the projection lens 3.

(Configuration of light source device)
FIG. 2 is a diagram illustrating the configuration of the light source device 10 in FIG. FIG. 3 is a diagram showing a configuration of a general light source lamp for comparison with the light source device of FIG.

Referring to FIG. 2, the light source device 10 includes a solid-state light source 50, a translucent rod 52, a condenser lens 54, a dichroic mirror 55, a reflector 56, a support portion 58, a phosphor 60, and a fluorescent light. And a phosphor installation part 62 on which the body 60 is installed.

The solid light source 50 includes a solid light source such as an LED (Light Emitting Diode) or an LD (Laser Diode), and emits light in a predetermined wavelength band. In the first embodiment of the present invention, the solid light source 50 is composed of, for example, an excitation laser light source that emits laser light including ultraviolet light toward the phosphor 60 that is a light emitting unit. When the light emitted from the solid light source 50 is incident on one end of the translucent rod 52, it propagates through the translucent rod 52 and is emitted from the other end of the translucent rod 52. The The translucent rod 52 suppresses the spread of light emitted from the solid light source 50.

The other end of the translucent rod 52 is optically connected to the apex of the reflector 56. A through hole is provided at the apex of the reflector 56, and a condenser lens 54 is attached to the through hole. The condensing lens 54 condenses the light guided to the other end of the translucent rod 52 and enters the inside of the reflector 56.

The reflector 56 is provided around the optical axis AX. The reflector 56 has a reflection surface that reflects light emitted from the light emitting unit provided on the optical axis AX. This reflecting surface has substantially the same shape as a rotating paraboloid obtained by rotating a part of a parabola around the optical axis AX. The reflector 56 is obtained by vapor-depositing a highly reflective member such as a dielectric multilayer film or a metal member on the surface on the side where the reflecting surface is formed. As a base material constituting the reflector 56, for example, heat resistant glass is used.

The phosphor 60 is installed at the focal position of the reflector 56 having substantially the same shape as the rotary paraboloid. Specifically, the phosphor 60 can be installed at the focal position of the reflector 56 by supporting the phosphor installation unit 62 where the phosphor 60 is installed by the support unit 58.

The condensing lens 54 condenses the light from the solid light source 50 at the focal position of the reflector 56 by its refraction action. The phosphor 60 arranged at the focal position of the reflector 56 is excited by the light condensed by the condenser lens 54 and emits light in the visible wavelength region. The light emitted from the phosphor 60 enters the reflecting surface of the reflector 56. The light incident on the reflecting surface of the reflector 56 becomes substantially parallel light and is emitted in a predetermined direction.

Thus, the phosphor 60 constitutes the “light emitting unit” of the light source device according to Embodiment 1 of the present invention. In Embodiment 1 of the present invention, since the light condensed by the condensing lens 54 is incident on the phosphor 60, the light that can be effectively used for excitation (wavelength conversion) in the phosphor 60 increases. A highly efficient light emitting unit close to the light source can be realized.

The phosphor 60 uses, for example, a fluorescent material that emits R light, G light, and B light when excited by light in a specific wavelength region (for example, ultraviolet light) out of light emitted from the solid light source 50. Configured. The fluorescent material contains rare earth element ions that function as fluorescent active element ions. Europium (Eu) and terbium (Tb) can be used as the rare earth element ions. A fluorescent substance containing europium Eu3 + as a rare earth element ion absorbs light of 200 nm to 430 nm and emits light in the vicinity of 570 nm to 630 nm. Therefore, it absorbs ultraviolet light or near ultraviolet light and emits R light. it can. In addition, since the fluorescent substance containing europium Eu2 + absorbs light of 200 nm to 400 nm and emits light in the vicinity of 540 nm to 560 nm, it can absorb ultraviolet light or near ultraviolet light and emit G light. Further, since the fluorescent substance containing terbium Tb3 + absorbs light of 300 nm to 400 nm and emits light of around 380 nm to 460 nm, it can absorb ultraviolet light or near ultraviolet light and emit B light.

By mixing the plurality of fluorescent substances to form the phosphor 60, the phosphor 60 absorbs ultraviolet light emitted from the solid light source 50 and emits R light, G light, and B light. The R light, G light, and B light emitted by the phosphor 60 are mixed to generate white light. In addition, the kind, content, etc. of rare earth element ions can be adjusted according to the wavelength range of light to be emitted and the wavelength range of excitation light therefor.

Here, the emitted light of the phosphor 60 is an isotropic radiated light. Therefore, the phosphor installation part 62 has a substrate made of a light-transmitting material such as heat-resistant glass, and a reflection mirror 61 disposed on the apex side of the reflector 56 of the substrate. The phosphor installation part 62 guides the emitted light of the phosphor 60 radiated toward the opening of the reflector 56 to the apex part side of the reflector 56 by reflection by the reflection mirror 61. In addition, the reflection mirror 61 is formed in a planar shape or a curved surface shape so that the directivity of the emitted light is efficiently converted in the direction of the irradiated surface on the reflection surface of the reflector 56 after reflection by the reflection mirror 61. ing.

Thereby, the isotropic emitted light of the phosphor 60 can be efficiently incident on the reflecting surface of the reflector 56. As a result, the light use efficiency of the light source device 10 can be increased. The light use efficiency of the light source device 10 indicates the ratio of the total light amount emitted as illumination light from the opening of the reflector 56 to the total light amount emitted from the solid light source 50.

Further, in order to suppress the emission light of the phosphor 60 emitted toward the apex of the reflector 56 from entering the solid light source 50 through the condensing lens 54 and the translucent rod 52, Is provided with a dichroic mirror 55. The dichroic mirror 55 reflects light in a predetermined wavelength region emitted from the phosphor 60 and transmits light in other wavelength regions (ultraviolet light). Thereby, it is possible to prevent the solid light source 50 from being thermally damaged by receiving the light emitted from the phosphor 60.

Here, as shown in FIG. 3, a general light source lamp used for a projector is configured by combining a reflector 1100 and an arc tube 1000 having a light emission center at the focal position of the reflector 1100. The arc tube 1000 has a tube bulb portion and a pair of sealing portions extending on both sides of the tube bulb portion. The tube portion is formed in a spherical shape, and has a pair of electrodes disposed in the tube portion, and mercury, a rare gas, and a small amount of halogen sealed in the tube portion. As the arc tube 1000, for example, a metal halide lamp, an ultra-high pressure mercury lamp, or the like is employed, and the reflector 1100 reflects light emitted from the arc tube 1000 toward the irradiated surface side.

As light emission characteristics of such a light source lamp, it is generally desired that the color balance in the visible wavelength region is good and the light intensity is high. However, although the ultra high pressure mercury lamp has a relatively high light intensity, its emission characteristic has an emission spectrum unique to mercury, and among the R, G, and B color light wavelength ranges, the R light wavelength range. The light intensity tends to be insufficient. For this reason, there was a problem that illumination light with good color balance in the visible wavelength range could not be obtained.

Further, since the light source lamp is used while keeping the arc tube 1000 at a high voltage and a high temperature, a large ballast and a cooling device are required, and there is a problem that the projector system becomes large. In addition, when starting the lighting of the light source lamp, first, a high voltage pulse is applied to the electrode arranged in the bulb portion, and the electrode is warmed to some extent to shift to arc discharge. .

Further, in the light source lamp, the temperature in the arc tube 1000 rises due to the heat generated by the light emission of the arc tube 1000 and heat convection occurs, and there is a temperature difference between the upper side and the lower side with respect to the gravity in the arc tube 1000. It will occur. When such a temperature difference occurs, whitening or blackening occurs on the inner wall of the arc tube 1000, so that the brightness of the light source lamp is reduced and the life of the light source lamp is shortened. In order to prevent such a phenomenon of whitening or blackening, the temperature distribution on the upper side and the lower side of the arc tube 1000 should be uniform even when the projector is in both the normal position and the ceiling position. As a result, the position of the light source lamp accommodated in the projector is limited.

On the other hand, the light source device 10 according to Embodiment 1 of the present invention uses the phosphor 60 as a light emitting unit instead of the arc tube 1000 of the light source lamp of FIG. With the configuration using the solid light source 50, it is possible to instantaneously turn on the light source lamp without changing the shape of the light source lamp, and it is possible to realize low power consumption and long life.

Also, since the light source device has substantially the same shape as the light source lamp, the housing and system can be shared with a projector equipped with the light source lamp. As a result, a large system change is not necessary from a projector equipped with a light source lamp.

Further, the light source device according to Embodiment 1 of the present invention condenses the excitation light emitted from the solid light source 50 onto the phosphor 60 by the translucent rod 52 and the condensing lens 54. 60 can be efficiently converted into light in the visible wavelength region. Thereby, illumination light with good color balance can be easily obtained with high light use efficiency.

In addition, as described with reference to FIG. 2, an excitation laser light source with low power consumption is used as an excitation light source, and excitation light is guided by guiding light into the reflector 56 using a light guide means such as a translucent rod 52. By adopting a configuration in which the light source is provided outside the reflector 56, a large cooling device for cooling the light emitting unit is not necessary, and the light source device can be downsized.

Further, as compared with the light source lamp shown in FIG. 3, the light source device according to Embodiment 1 of the present invention eliminates the restriction of the arrangement position due to the temperature difference inside the arc tube when housed in the projector. The degree of freedom of arrangement of the light source device can be increased. As a result, the projector can be further reduced in size.

[Embodiment 2]
FIG. 4 is a diagram for explaining the configuration of a light source device according to Embodiment 2 of the present invention.

Referring to FIG. 4, light source device 10a according to Embodiment 2 of the present invention includes a plurality (for example, two) of solid

light sources

50a and 50b as compared with light source device 10 shown in FIG. It differs only in respect.

Both the solid

light sources

50a and 50b are composed of excitation laser light sources, and the wavelength ranges of the emitted laser beams are different from each other. The first wavelength band laser beam emitted from the solid light source 50 a and the second wavelength band laser light emitted from the solid light source 50 b are both incident on one end of the translucent rod 52. Then, the light propagates through the translucent rod 52 and is emitted toward the phosphor 60 through the condensing lens 54 provided at the other end of the translucent rod 52.

The phosphor 60 is excited by light in the first wavelength band and emits two of R light, G light, and B light (for example, R light and G light), and And a second fluorescent material that is excited by light in the second wavelength band and emits the remaining one of R light, G light, and B light (for example, B light). White light is generated by mixing R light and G light emitted by the first fluorescent material and B light emitted by the second fluorescent material.

As described above, the light source device 10a according to the second embodiment of the present invention uses a plurality of laser beams having different wavelength regions as excitation light of the phosphor 60, thereby converting the laser light having a single wavelength region into the phosphor. Compared with the light source device 10 (FIG. 2) used as excitation light, the excitation efficiency of the phosphor 60 (= conversion efficiency in which the excitation spectrum to the phosphor 60 is converted in wavelength and emitted as a fluorescence spectrum) can be increased. .

This is based on the fact that the smaller the difference between the wavelength of the phosphor excitation light (for example, ultraviolet light) and the wavelength of the phosphor emission light, the higher the phosphor excitation light rate. That is, in the example of FIG. 4, an excitation laser light source that emits laser light having a first wavelength range close to the wavelength range of R light and G light is applied to the solid light source 50a, and the solid light source 50b is By applying an excitation laser light source that emits laser light having a second wavelength region close to the wavelength region of B light, the excitation light rate of the entire phosphor can be increased. As a result, the light use efficiency of the light source device 10a can be increased.

In the light source device 10a of FIG. 4, the configuration in which R light, G light, and B light are obtained by using the emitted light of the two types of solid

light sources

50a and 50b as the excitation light of the phosphor is exemplified. In addition to providing three types of solid light sources corresponding to each of the G light and the B light, and for each solid light source, the wavelength of the laser light emitted so as to be close to the corresponding color light is set, The phosphor excitation light rate can be further increased.

(Modification 1)
As described above, the light source device including the plurality of solid

light sources

50a and 50b can be realized by the light source device 10b shown in FIG. 5 instead of the light source device 10a shown in FIG.

FIG. 5 is a diagram for explaining the configuration of the light source device according to the first modification of the second embodiment of the present invention.

Referring to FIG. 5, the light source device 10 b according to the first modification includes a plurality of (for example, two)

solid light sources

50 a and 50 b of the reflector 56 as compared with the light source device 10 a illustrated in FIG. 4. It differs in that it is provided on the opening side.

The solid

light sources

50 a and 50 b are provided at positions that are symmetric with respect to the optical axis AX of the reflector 56. The solid light source 50a emits laser light having a first wavelength region in a direction perpendicular to the optical axis AX. The solid light source 50b emits laser light having a second wavelength region in a direction perpendicular to the optical axis AX.

A reflection mirror 50 c is provided at the opening of the reflector 56. The reflection mirror 50c is disposed on the optical axis AX in which the light emitted from the phosphor 60 does not pass directly.

The laser light emitted from the solid light source 50 a is bent by approximately 90 ° by the reflection mirror 50 c and is incident on the phosphor setting portion 62. Similarly, the laser light emitted from the solid-state light source 50b is incident on the phosphor installation portion 62 after the optical path is bent by approximately 90 ° by the reflection mirror 50c.

The phosphor installation portion 62 has a dichroic mirror 61 b on the apex portion side of the reflector 56. The dichroic mirror 61 b transmits the laser light (phosphor excitation light) incident on the phosphor setting portion 62, while reflecting the emitted light of the phosphor 60 radiated toward the opening of the reflector 56. It leads to the apex side of the reflector 56.

With this configuration, in the light source device 10b according to the first modification, a plurality of solid light sources can be installed on the outer edge of the opening of the reflector 56. As a result, the amount of light emitted from the phosphor 60 can be increased by irradiating the phosphor 60 with higher output excitation light.

In the light source device 10b according to the first modification, the plurality of solid

light sources

50a and 50b may be configured by a plurality of excitation laser light sources having different wavelength ranges as described in FIG. A plurality of excitation laser light sources having the same may be used.

Further, the reflection mirror 50 c is not limited to the configuration provided outside the reflector 56 as shown in FIG. 5, and may be configured to be provided inside the reflector 56. The reflection mirror 50c can also guide the light from each solid light source to the phosphor 60 by reflecting it at a reflection angle other than 90 °.

(Modification 2)
FIG. 6 is a diagram illustrating the configuration of a light source device according to Modification 2 of Embodiment 2 of the present invention.

Referring to FIG. 6, the light source device 10c according to the second modification is different only in that it includes reflection mirrors 50d and 50e instead of the reflection mirror 50c in the light source device 10b shown in FIG.

The reflection mirrors 50 d and 50 e are installed on the outer edge of the opening of the reflector 56. The laser light emitted from the solid light source 50 a is incident on the reflecting surface of the reflector 56 after the optical path is bent by approximately 90 ° by the reflecting mirror 50 d. The laser light incident on the reflecting surface of the reflector 56 is further bent in the optical path and is incident on the phosphor installation portion 62. Similarly, the laser light emitted from the solid-state light source 50b has its optical path bent by approximately 90 ° by the reflecting mirror 50e and is incident on the reflecting surface of the reflector 56. The laser light incident on the reflecting surface of the reflector 56 is further bent in the optical path and is incident on the phosphor installation portion 62.

The phosphor installation part 62 has a dichroic mirror 61 c on the apex side of the reflector 56. The dichroic mirror 61 c transmits laser light (phosphor excitation light) incident on the phosphor setting portion 62, while reflecting the emitted light of the phosphor 60 radiated toward the opening of the reflector 56. Guide to the apex side of the reflector 56.

In contrast to the light source device 10b according to the first modification shown in FIG. 5 and the light source device 10c according to the second modification shown in FIG. 6, the light source device 10b is optically located near the optical axis AX of the reflector 56. Since the components are arranged, it is desirable that the reflector 56 has a reflecting surface having substantially the same shape as the paraboloid of revolution. On the other hand, in the light source device 10c, since the optical component is disposed in the vicinity of the outer edge of the opening of the reflector 56, it is desirable that the reflector 56 has a reflecting surface having substantially the same shape as the spheroid.

[Embodiment 3]
FIG. 7 is a diagram for explaining the configuration of a light source device according to Embodiment 3 of the present invention.

Referring to FIG. 7, the light source device 10 d according to the third embodiment of the present invention allows the solid light source 50 to rotate around the optical axis AX of the reflector 56 as compared with the light source device 10 illustrated in FIG. 2. It differs in that it is arranged.

Specifically, the solid light source 50 is arranged so that its optical axis is substantially parallel to the optical axis AX of the reflector 56. The optical axis of the solid light source 50 is separated from the optical axis AX of the reflector 56 by a predetermined distance. The solid light source 50 has a rotation shaft 51 provided so as to coincide with the optical axis AX of the reflector 56. The rotating shaft 51 is connected to a motor (not shown), and when the motor rotates with respect to the rotating shaft, the solid light source 50 rotates about the rotating shaft 51. Then, when the solid light source 50 rotates around the rotation axis 51, the optical axis of the solid light source 50 rotates around the optical axis AX of the reflector 56.

By rotating the solid light source 50 in this way, the irradiation position of the light emitted from the solid light source 50 and entering the phosphor 60 through the translucent rod 52 and the condenser lens 54 is centered on the optical axis AX of the reflector 56. It moves in time on the circumference of the predetermined radius. Thereby, it can suppress that the said specific position is overheated and light emission performance of the fluorescent substance 60 deteriorates because light injects into the specific position of the fluorescent substance 60 intensively. As a result, the life of the light source device 10d can be extended.

(Modification 1)
FIG. 8 is a diagram illustrating the configuration of the light source device according to Modification 1 of Embodiment 3 of the present invention.

Referring to FIG. 8, the light source device 10 e according to the first modification example is different from the light source device 10 d illustrated in FIG. 7 in that a rotation mechanism that rotates the eccentric lens 53 instead of the rotation mechanism that rotates the solid light source 50. It differs in that it is equipped with.

The eccentric lens 53 is provided between the translucent rod 52 and the condenser lens 54. The decentering lens 53 is an optical element that emits incident light from the translucent rod 52 in a direction bent by a predetermined angle. A rotation shaft 57 that is substantially parallel to the optical axis AX of the reflector 56 is fixed at the center of the eccentric lens 53. The rotation shaft 57 is separated from the optical axis AX of the reflector 56 by a predetermined distance so that light is incident on the eccentric position of the eccentric lens 53.

The rotating shaft 57 is connected to a motor (not shown), and when the motor rotates with respect to the rotating shaft, the eccentric lens 53 rotates around the rotating shaft 57. Then, when the eccentric lens 53 rotates around the rotation axis, the emitted light from the eccentric lens 53 rotates around the optical axis AX of the reflector 56. Light emitted from the eccentric lens 53 is incident on the phosphor 60 through the condenser lens 54.

By rotating the eccentric lens 53 in this way, the irradiation position of the light emitted from the solid light source 50 and incident on the phosphor 60 through the translucent rod 52, the eccentric lens 53 and the condenser lens 54 is the light of the reflector 56. It moves on the circumference of a predetermined radius centered on the axis AX. Thereby, since it can suppress that the fluorescent substance 60 overheats when light concentrates on the specific position of the fluorescent substance 60, the lifetime of the light source device 10e can be extended.

(Modification 2)
FIG. 9 is a diagram illustrating the configuration of a light source device according to Modification 2 of Embodiment 3 of the present invention.

Referring to FIG. 9, the light source device 10 f according to the second modification example is different from the light source device 10 d illustrated in FIG. 7 in that a rotation mechanism that rotates the phosphor 60 instead of the rotation mechanism that rotates the solid light source 50. It differs in that it is equipped with.

Specifically, a rotation shaft 63 that is substantially parallel to the optical axis AX of the reflector 56 is fixed at the center of the phosphor installation portion 62 in which the phosphor 60 is installed. The rotating shaft 63 is separated from the optical axis AX of the reflector 56 by a predetermined distance. The rotating shaft 63 is connected to a motor (not shown). When the motor rotates with respect to the rotating shaft 63, the phosphor setting portion 62 and the phosphor 60 rotate around the rotating shaft 63.

By rotating the phosphor 60 in this manner, the irradiation position of the light emitted from the solid light source 50 and incident on the phosphor 60 through the translucent rod 52 and the condenser lens 54 is centered on the optical axis AX of the reflector 56. It moves in time on the circumference of a predetermined radius. Thereby, since it can suppress that the fluorescent substance 60 overheats when light concentrates on the specific position of the fluorescent substance 60, the lifetime of the light source device 10f can be extended.

[Embodiment 4]
FIG. 10 is a diagram illustrating the configuration of the light source device according to Embodiment 4 of the present invention.

Referring to FIG. 10, light source device 10g according to Embodiment 4 of the present invention is different from light source device 10f shown in FIG. 9 in that solid light source 50g and phosphor 60 are used instead of solid light source 50 and phosphor 60. It differs by the point provided with 60g.

The solid light source 50g is a three-wavelength laser light source that emits laser light with three wavelengths. Specifically, the solid light source 50g is configured, for example, by mounting three single-wavelength laser light sources in a single package. The three laser light sources mounted on the package are spaced apart by a predetermined distance, and the solid light source 50g emits parallel light having three different wavelengths. The three laser beams emitted from the solid light source 50g propagate through the same optical path and enter the phosphor 60g. At this time, the condenser lens 54 causes the three laser beams to be incident on the phosphor 60g while being separated from each other.

The light source device 10g includes a rotation mechanism that rotates the phosphor 60g, similarly to the light source device 10f shown in FIG. Specifically, a rotation shaft 63 substantially parallel to the optical axis AX of the reflector 56 is fixed at the center of the phosphor installation portion 62 where the phosphor 60g is installed. The rotating shaft 63 is connected to a motor (not shown), and when the motor rotates with respect to the rotating shaft 63, the phosphor setting portion 62 and the phosphor 60g rotate around the rotating shaft 63.

By rotating the phosphor 60g, the irradiation positions of the three laser beams emitted from the three-wavelength laser light source, which is the solid light source 50g, and incident on the phosphor 60g through the translucent rod 52 and the condenser lens 54 are respectively It moves temporally on the circumference of three concentric circles having different radii around the optical axis AX of the reflector 56. Thereby, it can suppress that three laser beams are intensively incident on the specific position of the fluorescent substance 60g, respectively.

Here, the phosphor 60g according to the fourth embodiment of the present invention includes three phosphors that absorb laser light having three different wavelengths as excitation light and emit R light, G light, and B light, respectively. Has been. FIG. 11 is a diagram illustrating the configuration of the phosphor 60g viewed from the A direction (optical axis direction) in FIG.

Referring to FIG. 11, phosphor 60g includes an R light phosphor 600R that emits R light, a G light phosphor 600G that emits G light, and a B light phosphor 600B that emits B light.

The R light phosphor 600R, the G light phosphor 600G, and the B light phosphor 600B are arranged in the arrangement shown in FIG. 11 on the main surface of the reflection mirror 61 provided in the phosphor installation portion 62. Specifically, the B light phosphor 600B, the R light phosphor 600R, and the G light phosphor 600G are arranged concentrically so as to be adjacent to each other in the radial direction in this order from the rotating shaft 63 side.

In the above configuration, of the three different wavelength laser beams incident on the phosphor 60g, the first laser beam is incident on the B phosphor 600B, and the second laser beam is incident on the R phosphor 600R. The third laser light is incident on the G phosphor 600G.

The B phosphor 600B emits B light when excited by the first laser beam. The R light phosphor 600R is excited by the second laser light to emit R light. The G light phosphor 600G is excited by the third laser light to emit G light. The B light, R light, and G light emitted from the

phosphors

600B, 600R, and 600G are incident on the reflecting surface of the reflector 56 either directly or indirectly by being reflected by the reflecting mirror 61. The light incident on the reflecting surface of the reflector 56 becomes substantially parallel light and is emitted in a predetermined direction. At this time, since the R light, B light, and G light are mixed, white light can be obtained.

Here, in the three laser beams emitted from the three-wavelength laser light source, the first laser beam is a laser beam having a wavelength close to the wavelength range of the B light, and the second laser beam is a wavelength range of the R light. The third laser beam is a laser beam having a wavelength close to the wavelength range of the G light. Thus, for each phosphor, the wavelength of the corresponding laser beam is set so that the difference between the wavelength of the light emitted from the phosphor and the wavelength of the excitation light for that becomes small, thereby exciting each color phosphor. Efficiency can be increased. As a result, the light use efficiency of the light source device 10g can be improved.

Further, in the phosphor 60g shown in FIG. 11, the shape and arrangement of the R light phosphor 600R, the G light phosphor 600G, and the B light phosphor 600B are determined by the intensity of light emitted by each color phosphor (fluorescence emission amount). Set accordingly. As a result, as described below, it is possible to obtain illumination light with a good color balance and to suppress the deterioration of the light emission performance due to the temperature rise of each color phosphor.

The light source device 10g emits white light generated by mixing R light, G light, and B light emitted from the

phosphors

600R, 600G, and 600B as illumination light. The color balance of the image projected from the projector (FIG. 1) depends on the color balance of the illumination light of the light source device 10g.

Here, the color balance of the illumination light of the light source device 10g is determined by the ratio of the R, B, and G fluorescence emission amounts. Note that the amount of fluorescent light emission varies according to the excitation efficiency of each color phosphor. For example, assuming that the ratio of mixing R light, G light, and B light to obtain white illumination light is 3: 6: 1, the R light phosphor 600R, the G light phosphor 600G, and the B light phosphor By adjusting the ratio of 600B fluorescence emission to 3: 6: 1, illumination light with good color balance can be irradiated.

On the other hand, the amount of light emitted from the phosphor increases as the excitation light received by the phosphor increases, that is, as the output light amount of the laser light source increases. Therefore, in order to realize the ratio (3: 6: 1) described above, it is necessary to make the output light amount of the laser light source for G light excitation larger than the output light amount of the laser light source for R light and B light excitation. Therefore, non-uniform heat generation occurs between the

phosphors

600R, 600G, and 600B. In the above-described case, the heat generation amount of the G light phosphor 600G is maximized. Therefore, the performance of the G light phosphor 600G is likely to deteriorate compared to the R light phosphor 600R and the B light phosphor 600B.

In order to eliminate such problems, in the phosphor 60g, the G light phosphor 600G having the largest calorific value is disposed on the outer peripheral side, and the R light phosphor 600R and the B light phosphor 600B are disposed on the inner peripheral side. ing. Thereby, when the phosphor 60g is rotated at a predetermined rotation speed, the amount of movement per unit time of the irradiation position of the laser light for G light excitation is the unit of the laser light for R light excitation and the laser light for B light excitation. It will be larger than the amount of movement per hour. Therefore, when the calorific value of each color phosphor is converted into the calorific value per unit area, the variation in the calorific value per unit area among the

phosphors

600R, 600B, and 600G can be eliminated. As a result, it is possible to obtain illumination light with good color balance while suppressing the temperature rise of each color phosphor.

[Embodiment 5]
FIG. 12 is a diagram for explaining the configuration of a projector equipped with a light source device according to Embodiment 5 of the present invention.

Referring to FIG. 12, the projector according to the fifth embodiment of the present invention is a multi-lamp projector equipped with a plurality of (for example, four) light source devices 10 as compared with the projector shown in FIG. There are some differences. The four light source devices 10 all have the same structure as the light source device 10 described in FIG.

In FIG. 12, four light source devices 10 are arranged to face each other in the X direction in the figure. A reflective mirror 8 is installed between the two light source devices 10 facing each other. The reflection mirror 8 guides the light emitted from each light source device 10 to the fly eye integrator 11.

As described above, the light source device 10 has substantially the same shape as a light source lamp (FIG. 3) such as an ultra-high pressure mercury lamp, so that not only the single lamp projector shown in FIG. Even in a multi-lamp type projector, a housing and a system can be shared with a projector equipped with a light source lamp. Therefore, a high-brightness projector can be constructed at low cost.

Further, since the position of the light source device 10 accommodated in the projector is not limited, it is possible to adopt an arrangement other than the arrangement shown in FIG.

[Embodiment 6]
FIG. 13 is a diagram for explaining the configuration of a light source device according to Embodiment 6 of the present invention.

Referring to FIG. 13, light source device 10 h according to Embodiment 6 of the present invention differs from light source device 10 f shown in FIG. 9 only in that phosphor 60 h is provided instead of phosphor 60.

The light source device 10h includes a rotation mechanism that rotates the phosphor 60h, similarly to the light source device 10f shown in FIG. Specifically, a rotation shaft 63 parallel to the optical axis AX of the reflector 56 is fixed at the center of the phosphor installation portion 62 where the phosphor 60h is installed. The rotating shaft 63 is separated from the optical axis AX of the reflector 56 by a predetermined distance. The rotating shaft 63 is connected to a motor (not shown). When the motor rotates with respect to the rotating shaft 63, the phosphor setting portion 62 and the phosphor 60 h rotate around the rotating shaft 63.

By rotating the phosphor 60h, the irradiation position of the laser light emitted from the excitation laser light source that is the solid light source 50 and incident on the phosphor 60h through the translucent rod 52 and the condensing lens 54 is respectively reflected by the reflector 56. And move around the circumference of a predetermined radius centered on the optical axis AX.

The phosphor 60h according to the sixth embodiment of the present invention is composed of three phosphors that absorb laser light as excitation light and emit R light, G light, and B light in a time-sharing manner.

FIG. 14 is a diagram illustrating the configuration of the phosphor 60h viewed from the optical axis direction (A direction in FIG. 13).

Referring to FIG. 14, phosphor 60h includes an R light phosphor 620R, a G light phosphor 620G, and a B light phosphor 620B.

The R light phosphor 620R, the G light phosphor 620G, and the B light phosphor 620B are arranged in the arrangement shown in FIG. 14 on the main surface of the reflection mirror 61 of the phosphor mounting portion 62. Specifically, the fan-shaped R light phosphor 620R, the G light phosphor 620G, and the B light phosphor 620B are arranged side by side in the circumferential direction around the rotation axis 63.

In the above configuration, when the phosphor 60h rotates around the rotation axis 63, the irradiation position of the laser light incident on the phosphor 60h is the R light phosphor 620R, the G light phosphor 620G, and the B light phosphor. It changes periodically in the order of 620B. As a result, the phosphor 60h periodically emits and emits R light, G light, and B light in that order. R light, G light, and B light periodically emitted from the phosphor 60 h are directly or indirectly reflected by the reflection mirror 61 and incident on the reflection surface of the reflector 56. The light incident on the reflecting surface of the reflector 56 becomes substantially parallel light and is emitted in a predetermined direction. At this time, R light, G light, and B light are periodically emitted in this order from the opening of the reflector 56.

As described above, according to the sixth embodiment of the present invention, the phosphor 60h can be rotated about the rotation axis 63, and the R phosphor 620R and the G phosphor are rotated in the rotation direction of the phosphor 60h. By arranging 620G and B light phosphors 620B in order, a light source device capable of emitting R light, G light, and B light in that order in a time-division manner without changing the shape of the light source lamp (FIG. 3) is realized. can do. Therefore, by using the light source device according to Embodiment 6 of the present invention, a time-division projector can be easily and compactly constructed. Also in such a projector, since the light source device has substantially the same shape as the light source lamp, the housing and system can be shared with the projector equipped with the light source lamp. System changes are not required.

In the phosphor 60h, the order of emitting the three color lights is arbitrary depending on the configuration of the phosphor 60h. Further, the emitted color light is not limited to the three colors R, G, and B, and it is also possible to periodically emit four or more color lights. For example, in the phosphor 60h shown in FIG. 14, a configuration in which Ye phosphors that fluoresce light in the yellow wavelength band (hereinafter referred to as “Ye light”) in the rotation direction is further arranged so that R light and G light are arranged. , B light and Ye light can be emitted periodically in order. Alternatively, if phosphors that emit cyan (Cy) or magenta (Mg) color light are arranged, R, G, B, Cy, and Mg color light can be emitted in order.

Further, in the phosphor 60h, the shapes of the R light phosphor 620R, the G light phosphor 620G, and the B light phosphor 620B are set according to the intensity of light (fluorescent light flux) emitted from each color phosphor. Specifically, assuming that the ratio of mixing R light, G light, and B light to obtain white light is 3: 6: 1, the R light phosphor 600R, the G light phosphor 600G, B White light illumination light can be irradiated by adjusting the ratio of the angle range of the photophosphor 600B to 3: 6: 1. As a result, an image with good color balance can be displayed.

[Embodiment 7]
FIG. 15 is a diagram illustrating a configuration of a light source device according to Embodiment 7 of the present invention and an optical engine of a projector equipped with the light source device.

Referring to FIG. 15, optical engine 2 i according to the seventh embodiment of the present invention includes light source device 10 i, translucent rod 80, relay optical system 82, light modulation element 84, and projection lens 3. . The light source device 10i, the translucent rod 80, and the relay optical system 82 are sequentially arranged along the optical axis AX.

The light source device 10i differs from the light source device 10h shown in FIG. 13 only in that a reflector 56i is provided instead of the reflector 56.

The reflector 56i has a reflecting surface having substantially the same shape as a spheroidal surface obtained by rotating an ellipse around the optical axis AX. The phosphor 60h is installed at a first focal point which is one of the focal points defining the ellipse of the reflector 56I having a spheroid shape. Specifically, the phosphor 60h can be installed at the first focal point of the reflector 56i by supporting the phosphor installation unit 62 with a support unit (not shown).

A rotation shaft 63 parallel to the optical axis AX of the reflector 56i is fixed at the center of the phosphor installation portion 62 where the phosphor 60h is installed. The rotating shaft 63 is separated from the optical axis AX of the reflector 56 by a predetermined distance. The rotating shaft 63 is connected to a motor (not shown). When the motor rotates with respect to the rotating shaft 63, the phosphor setting portion 62 and the phosphor 60 h rotate around the rotating shaft 63.

As described with reference to FIG. 14, the phosphor 60h includes three

phosphors

620R, 620G, and 620B that absorb laser light as excitation light and emit R light, G light, and B light in a time-sharing manner. . Specifically, the fan-shaped R light phosphor 620R, the G light phosphor 620G, and the B light phosphor 620B are arranged side by side in the rotation direction. As the phosphor 60h rotates about the rotation axis 63, the irradiation position of the laser light incident on the phosphor 60h is periodically in the order of the R light phosphor 620R, the G light phosphor 620G, and the B light phosphor 620B. To change. Thereby, the phosphor 60h periodically emits and emits R light, G light, and B light in that order.

The R light, G light, and B light periodically emitted from the phosphor 60h are directly or indirectly reflected by the reflecting mirror 61 and incident on the reflecting surface of the reflector 56i. The light incident on the reflecting surface of the reflector 56i is reflected by the reflecting surface and emerges toward the second focal point of the ellipse. By making the reflecting surface substantially the same shape as the spheroid, the light incident on the reflecting surface from the light emitting point on the first focus can be efficiently advanced in the direction toward the second focus.

When the light traveling to the second focal point of the reflecting surface is incident on one end of the translucent rod 80, it propagates through the translucent rod 80 and from the other end of the translucent rod 80. Emitted.

The relay optical system 82 includes an entrance side lens, a relay lens, and an exit side lens. The light emitted from the translucent rod 80 is guided to the light incident surface of the light modulation element 84 through the incident side lens, the relay lens, and the emission side lens. Note that the configuration of the relay optical system 82 is not limited to this.

The light modulation element 84 is a DMD (Digital Micromirror Device) (registered trademark of TI), and is configured by a plurality of micromirrors. The plurality of micromirrors are movable, and each micromirror basically corresponds to one pixel. The light modulation element 84 is controlled by a control unit (not shown) to change the angle of each micromirror, thereby switching whether or not the light received from the relay optical system 82 is reflected to the projection lens 3 side. Thus, the brightness | luminance of emitted light is modulated by driving each micromirror and changing a reflection angle.

The light modulation element 84 controls each micromirror in synchronization with the timing when the R light, the G light, and the B light are emitted in order by the rotation of the phosphor 60h. That is, the change (pattern) of intensity applied to the light based on the image is switched in synchronization with the generation timing of the colored light by the phosphor 60h.

The color light reflected by the light modulation element 84 is projected onto a screen (not shown) through the projection lens 3. On the screen, images of R, G, and B color lights are projected in order according to the rotation of the phosphor 60h. Images of colored light of each color projected on the screen in order are recognized by the human eye as a color image generated by superimposing images of the colored light.

As described above, according to the seventh embodiment of the present invention, the light source device 10i can emit the R light, the G light, and the B light in that order in a time division manner without changing the shape of the light source lamp. A time-division projector can be easily and compactly constructed. Also in such a projector, since the light source device has substantially the same shape as the light source lamp, the housing and system can be shared with the projector equipped with the light source lamp. System changes are not required.

(Example of change)
FIG. 16 is a diagram illustrating the configuration of a light source device according to a modification of the seventh embodiment of the present invention. The light source device 10j according to this modification is a light source device capable of emitting R, G, B light in a time-sharing manner as described below. Therefore, it can be applied to the optical engine of the projector shown in FIG. 15 instead of the light source device 10i described above.

Referring to FIG. 16, the light source device 10j according to this modification is different from the light source device 10 shown in FIG. 2 only in that it includes three

solid light sources

50j, 50k, and 50l.

The

solid light sources

50j, 50k, and 50l are all composed of excitation laser light sources, and the wavelength ranges of the emitted laser beams are different from each other. A first wavelength range laser beam emitted from the solid state light source 50j, a second wavelength range laser beam emitted from the solid state light source 50k, and a third wavelength range laser beam emitted from the solid state light source 50l; When both are incident on one end of the translucent rod 52, they propagate through the translucent rod 52 and fluoresce through the condensing lens 54 provided on the other end of the translucent rod 52. It is emitted toward the body 60.

The phosphor 60 includes a first fluorescent material that emits R light when excited by light in the first wavelength region, and a second fluorescent material that emits G light when excited by light in the second wavelength region. And a third fluorescent material that emits B light when excited by light in the third wavelength region.

In the configuration as described above, the three

solid light sources

50j, 50k, and 50l are controlled to be lit in a time division manner by a lighting control unit (not shown). Specifically, the lighting control unit turns on the solid light source 50k for the first period, and then turns on the solid light source 50k for the second period. Then, after the solid light source 50k is turned on for the second period, the solid light source 50l is turned on for the third period. That is, the lighting control unit periodically turns on the solid light source 50j, the solid light source 50k, and the solid light source 50l in this order. Thereby, the light of the first wavelength range, the light of the second wavelength range, and the light of the third wavelength range are periodically incident on the phosphor 60 in that order.

In the phosphor 60, the first fluorescent material, the second fluorescent material, and the third fluorescent material absorb light in the first wavelength region, light in the second wavelength region, and light in the third wavelength region, respectively. Then, R light, G light, and B light are periodically emitted and emitted in this order. R light, G light, and B light periodically emitted from the phosphor 60 are directly or indirectly reflected by the reflecting mirror 61 and incident on the reflecting surface of the reflector 56. Therefore, R light, G light, and B light are periodically emitted in this order from the opening of the reflector 56.

As described above, according to this modified example, by controlling lighting of three excitation laser light sources having different wavelength ranges in a time-sharing manner, the shape of the light source lamp remains unchanged, and the R light, G light, A light source device capable of emitting B light in a time-sharing manner can be realized.

In addition, according to this modification, the first fluorescent material, the second fluorescent material, and the third fluorescent material included in the phosphor 60 are switched in a time division manner to emit light. Such a thermal load is distributed. Thereby, the rotation mechanism for moving the irradiation position of the excitation light to the phosphor 60 becomes unnecessary.

Further, in the light source device 10j according to this modification, it is possible to freely irradiate illumination lights of a plurality of colors by changing the ratio of the period during which the

solid light sources

50j, 50k, and 50l are turned on in the lighting control. .

For example, the ratio of the first period during which the solid light source 50j is turned on, the second period during which the solid light source 50k is lit, and the third period during which the solid light source 50l is lit is set to 3: 6: 1. Illumination light can be obtained. On the other hand, if the ratio of the period is 5: 3: 2, reddish illumination light can be generated. Therefore, by adopting a configuration in which the ratio of the period is adjusted according to the color reproducibility required for the image to be displayed, it is suitable for each image even when displaying an image in which color gradation expression is important. Color reproduction can be performed.

[Embodiment 8]
FIG. 17 schematically shows a configuration of a main part of the projector according to the eighth embodiment of the invention.

Referring to FIG. 17, the projector is a type of projector that modulates illumination light incident from a light source as reflected light using a reflective light modulation element, and includes an optical engine 2k and a projection lens 3. The outer shell is covered with a casing (not shown). The projector is also equipped with components such as a speaker for outputting sound, a circuit board for electrically controlling the components of the optical engine 2k and the sound output means, but in FIG. The illustration of some components including these is omitted.

The optical engine 2k includes a first LED 104 that emits B light, a second LED 106 that emits R light, and a light source device 10k.

The first LED 104 is made of, for example, an InGaN-based material, a GaN-based material, or a zinc oxide-based material, and emits B light (wavelength is 430 to 470 nm, for example).

The second LED 106 is made of, for example, a material such as GaP or AlGaAs mixed color, and emits R light (wavelength is 580 to 780 nm, for example).

The light source device 10k includes an excitation laser light source 102 that emits laser light including ultraviolet light as a phosphor excitation light source, a condensing lens 108, and a phosphor rotating drum 110k. In the light source device 10k, the phosphor rotating drum 110k is coated with a phosphor that absorbs ultraviolet light and emits G light, as will be described later. The G light emitted from the phosphor rotating drum 110k enters the condenser lens 112.

The B light from the first LED 104 is incident on the dichroic prism 114 via the condenser lens 116. The R light from the second LED 106 is incident on the dichroic prism 114 via the condenser lens 118. The G light from the light source device 10 k is incident on the dichroic prism 114 via the condenser lens 112.

The first LED 104, the second LED 106, and the light source device 10k are switched and driven in a time division manner under the control of a control unit (not shown). Thereby, R light, G light, and B light are incident on the dichroic prism 114 in a time-sharing manner.

The dichroic prism 114 causes the B light, R light, and G light incident in a time division manner through the

condenser lenses

116, 118, and 112 to enter one end portion of the translucent rod 80. The B light, the R light, and the G light propagate through the inside of the translucent rod 80 and are emitted from the other end of the translucent rod 80. The translucent rod 80 has a function of an integrator optical system that converts a light beam having a non-uniform intensity distribution into a light beam having a substantially uniform intensity distribution.

The relay optical system 82 includes an entrance side lens, a relay lens, and an exit side lens. The light beam emitted from the translucent rod 80 is guided to the DMD 124 via the relay optical system 82 and the mirror 126. The configurations of the relay optical system 82 and the mirror 126 are not limited to this. That is, the relay optical system 82 and the mirror 126 may be configured to have a function of causing the DMD 124 to form an image of a substantially uniform light beam emitted from the translucent rod 80.

The DMD 124 is composed of a plurality of minute mirrors. The plurality of micromirrors are movable, and each micromirror basically corresponds to one pixel. The DMD 124 is controlled by a control unit (not shown) to change whether to reflect the light received from the relay optical system 82 via the mirror 126 to the projection lens 3 side by changing the angle of each micromirror. Thus, the brightness | luminance of emitted light is modulated by driving each micromirror and changing a reflection angle.

In the DMD 124, the tilt angle of each micromirror is controlled in synchronization with the timing at which the R light, the G light, and the B light are sequentially irradiated. That is, the emission timing of the R, G, and B color lights and the timing at which the DMD drive signal corresponding to each color light is output to the DMD 124 are synchronized.

The colored light reflected by the DMD 124 is projected on a screen (not shown) through the projection lens 3. Images with R, G, and B color lights are projected on the screen in order. Images of colored light of each color projected on the screen in order are recognized by the human eye as a color image generated by superimposing images of the colored light.

(Configuration of light source device)
Below, with reference to drawings, the structure of the light source device 10k mounted in the optical engine 2k which concerns on this Embodiment is demonstrated. FIG. 18 is a diagram illustrating the configuration of the light source device 10k in FIG.

17, the light source device 10k includes an excitation laser light source 102, a condenser lens 108, and a phosphor rotating drum 110k.

The excitation laser light source 102 emits laser light including ultraviolet light. The condensing lens 108 condenses the light emitted from the excitation laser light source 102. Specifically, the light emitted from the excitation laser light source 102 is condensed on the outer peripheral surface of the phosphor rotating drum 110 k by the refraction action of the condenser lens 108. Thereby, the light which can be effectively used for excitation of the phosphor in the phosphor rotating drum 110k can be efficiently supplied.

Referring to FIG. 18, phosphor rotating drum 110k includes a rotating shaft 300 that is orthogonal to the optical axis of excitation laser light source 102, and a rotating member 200k that is rotatable about rotating shaft 300.

The rotary shaft 300 is connected to a motor (not shown). By rotating the motor, the rotating body 200k rotates about the rotating shaft 300. The rotating body 200k is formed in a hollow cylindrical shape using heat resistant glass or the like as a base material, and receives light emitted from the excitation laser light source 102 on the outer peripheral surface thereof.

By rotating the rotating body 200k in this way, the irradiation position of light incident on the phosphor (corresponding to the hatched portion in the figure) arranged on the outer peripheral surface of the rotating body 200k is a circle centering on the rotation axis 300. It will move in time on the circumference. Thereby, it can suppress that the said specific position is overheated and damaged when light intensively injects into the specific position of fluorescent substance. As a result, the life of the light source device 10k can be extended.

FIG. 19 is a diagram illustrating the configuration of the rotating body 200k in FIG. FIG. 19A is a cross-sectional view in a direction perpendicular to the rotating shaft 300, and FIG. 19B is an enlarged view of the outer peripheral portion of the rotating body 200k.

Referring to FIG. 19A, a rotating body 200k has a cylindrical translucent substrate 210 and a predetermined angular range in the circumferential direction on the outer peripheral surface of the translucent substrate 210. The fluorescent substance 220 arrange | positioned and the dichroic film | membrane 230 are included.

The phosphor 220 emits visible light that is excited by light of a specific wavelength range emitted from the excitation laser light source 102 (for example, ultraviolet light). The ultraviolet-excited phosphor is excited by absorbing ultraviolet light / near-ultraviolet light of 200 to 400 nm emitted from an ultraviolet light emitting element (corresponding to the excitation laser light source 102), and the spectrum of R light, G light, and B light. Or, it emits and emits white visible light with mixed spectrum.

The phosphor contains rare earth element ions that function as fluorescently active element ions. Europium (Eu) and terbium (Tb) can be used as the rare earth element ions. A phosphor containing europium Eu3 + as a rare earth element ion absorbs light of 200 nm to 430 nm and emits light in the vicinity of 570 nm to 630 nm. Therefore, it can absorb ultraviolet light or near ultraviolet light and emit R light. it can. In addition, since the phosphor containing Europium Eu2 + absorbs light of 200 nm to 400 nm and emits light of 540 nm to 560 nm, it can absorb ultraviolet light or near ultraviolet light and emit G light. In addition, since the phosphor containing terbium Tb3 + absorbs light of 300 nm to 400 nm and emits light of around 380 nm to 460 nm, it can absorb ultraviolet light or near ultraviolet light and emit B light. As shown in FIG. 17, when obtaining monochromatic light of G light, an emission spectrum with high color purity can be obtained by using the above phosphor.

The dichroic film 230 is disposed on the inner peripheral surface of the translucent substrate 210 at a position facing the phosphor 220. The dichroic film 230 is a visible light reflecting member that transmits excitation light (ultraviolet light) emitted from the excitation laser light source 102 and reflects visible light emitted from the phosphor 220.

FIG. 19 (b) shows an enlarged view of the region RGN1 surrounded by a broken line in FIG. 18 (a). As shown in FIG. 19B, excitation light (ultraviolet light) transmitted through the dichroic film 230 and the translucent substrate 210 is incident on the phosphor 220. The phosphor 220 absorbs the ultraviolet light and emits G light. At this time, the emitted light of the phosphor 220 is an isotropic radiated light, so that light traveling inward in the radial direction is generated in addition to light traveling outward in the radial direction of the rotating body 200k. The dichroic film 230 is formed so as to reflect light traveling inward in the radial direction. Therefore, the light emitted from the phosphor 220 can be efficiently incident on the condenser lens 112 (FIG. 18), and the light use efficiency of the light source device 10k can be increased. The light use efficiency of the light source device 10k indicates the ratio of the total light amount emitted from the phosphor 220 as illumination light to the total light amount emitted from the excitation laser light source 102.

In addition, as shown in FIG. 17, by adopting a configuration in which the excitation light condensed by the condenser lens 108 is incident on the phosphor 220, light that can be effectively used for excitation (wavelength conversion) by the phosphor 220 is obtained. Since it increases, the light emission part close | similar to a point light source is realizable. As a result, light utilization efficiency is improved.

In general, in an optical engine including a light source system of a light source device and a display system of a display device such as a light modulation element, as an index representing a spatial spread of a luminous flux range that can be effectively used in a light source system or a display system, Etendue is known as the product of area and solid angle. The smaller the value of the etendue of the light source system, the more the emitted light flux from the light source converges in a narrow solid solid angle. Therefore, the emitted light from the light source system falls within the light angle range that can be effectively used in the display system. As a result, the light utilization efficiency of the entire optical engine is improved.

Since the etendue of the light source system is proportional to the area of the light emitting unit, it is necessary to make the light emitting area of the light source system as small as possible in order to increase the light use efficiency of the light source system. In the light source device according to Embodiment 8 of the present invention, the condensing lens 108 condenses the excitation light on the phosphor 220, so that the emission area of the phosphor 220 can be reduced. Thereby, since the value of etendue can be suppressed small, light utilization efficiency improves.

Note that a laser beam having a shorter wavelength than the light emitted from the phosphor 220 is applied to the laser beam as the excitation light. This is based on the fact that the light extraction efficiency is higher than when the wavelength of the excitation light is shorter than the wavelength of the emitted light of the phosphor. In the eighth embodiment, ultraviolet light is used as excitation light for the phosphor, but the excitation light is not limited to this as long as the wavelength is shorter than the color light to be emitted.

In the eighth embodiment, the phosphor 220 has a predetermined angular range (for example, 180 °) in the circumferential direction on the outer peripheral surface of the translucent substrate 210 as shown in FIG. It is arranged. Therefore, when the rotating body 200k is rotated, the phosphor 220 emits G light at a generation timing corresponding to the angular range. In the example of FIG. 19A, the phosphor 220 emits G light at a frequency that is approximately twice the rotational frequency of the rotating body 200k. Therefore, for example, when the frame frequency of the projector is set to 60 Hz, the rotation frequency of the rotating body 200k is set to 120 Hz or more in order to display an image of one frame by sequentially projecting images of R, G, B color light. It is desirable to do.

Referring to FIG. 18 again, the G light emitted from the phosphor 220 is again collected by the condenser lens 112 and then incident on the translucent rod 80 via the dichroic prism 114 (FIG. 1). . The B light from the first LED 104, the R light from the second LED 106, and the G light from the phosphor 220 emitted from the translucent rod 80 are applied to the DMD 124 (FIG. 17).

As described above, according to the eighth embodiment of the present invention, the excitation light emitted from the solid-state light source is condensed on the phosphor, whereby the wavelength can be efficiently converted by the phosphor, and the phosphor The emitted light can be efficiently directed toward the emission side. Therefore, the light use efficiency can be increased, and the luminance of the illumination light is improved. As a result, a light source device with high brightness and high efficiency can be realized.

Further, by rotating the rotating body, the irradiation position of the light incident on the phosphor arranged on the outer peripheral surface of the rotating body moves with time, so that thermal damage to the phosphor can be suppressed, so the light source device Can extend the service life.

Furthermore, since the phosphor rotating drum is rotated around the rotation axis orthogonal to the optical axis of the excitation light, the rotation axis direction is different from that of the color wheel. Therefore, the phosphor size is set in the direction perpendicular to the optical axis. Can be small. Therefore, it is possible to reduce the size of the light source device.

In the above-described eighth embodiment, the configuration in which only G light is fluorescently emitted out of R light, G light, and B light is exemplified, but this is R light, G light, and B light for obtaining white light. The mixing ratio is based on the fact that the luminance of the G light needs to be higher than that of other color lights, such as 1: 2: 1. That is, in the light source device according to the eighth embodiment, high luminance is efficiently obtained with the G light by fluorescently emitting the G light. Instead of the configuration of the eighth embodiment, one of G light, B light, and R light may be emitted by fluorescence, and the other of B light and R light may be emitted by an LED.

[Embodiment 9]
FIG. 20 is a view for explaining the configuration of an optical engine 21 according to Embodiment 9 of the present invention.

Referring to FIG. 20, the optical engine 21 according to the ninth embodiment of the present invention is different from the optical engine 2k shown in FIG. 17 in that the combination of the first LED 104, the second 106 and the light source device 10k is a single unit. The difference is that the light source device 10l is provided.

The light source device 101 includes a plurality of excitation laser light sources 102, a condensing lens 108, and a phosphor rotating drum 110l.

A plurality of (for example, six) excitation laser light sources 102 are arranged apart from each other by a predetermined distance, and each emits laser light including ultraviolet light.

The condensing lens 108 is provided corresponding to each excitation laser light source 102. The condensing lens 108 condenses the light emitted from the corresponding excitation laser light source 102 and causes the light to enter the phosphor rotating drum 110l.

The phosphor rotating drum 110l includes a plurality of (for example, six) fluorescent parts that receive light emitted from the plurality of excitation laser light sources 102 and emit one of R light, G light, and B light, respectively. As will be described later, the plurality of fluorescent portions are formed by arranging a plurality of rotating rings each having a fluorescent material coated on each outer peripheral surface in the direction of the rotation axis.

In such a configuration, the light emitted from the excitation laser light source 102 is condensed on the outer peripheral surface of the corresponding rotating ring (fluorescent portion) by the refraction action of the condenser lens 108. Thereby, the light which can be utilized effectively for excitation of a fluorescent substance for every fluorescent part can be supplied efficiently.

The R light, G light, and B light emitted from the plurality of rotating rings are incident on the condenser lens 112. The condensing lens 112 condenses the incident R light, G light, and B light and causes the light to enter one end of the translucent rod 80.

(Configuration of light source device)
The configuration of the light source device 10l mounted on the optical engine 21 according to the ninth embodiment will be described below with reference to the drawings. FIG. 21 is a diagram illustrating the configuration of the light source device 101 in FIG.

Referring to FIG. 21, the phosphor rotating drum 110l includes a rotating shaft 300 orthogonal to the optical axes of the plurality of excitation laser light sources 102, and a rotating body 200l that is rotatable about the rotating shaft 300.

The rotary shaft 300 is connected to a motor (not shown). By rotating the motor, the rotating body 200l rotates around the rotating shaft 300. The rotating body 200l is formed in a hollow cylindrical shape using heat-resistant glass or the like as a base material, and receives light emitted from a plurality of excitation laser light sources 102 on the outer peripheral surface thereof.

By rotating the rotator 200l in this way, the irradiation position of light incident on the phosphor (corresponding to the hatched portion in the figure) arranged on the outer peripheral surface of the rotator 200l is a circle centering on the rotation axis 300. It will move in time on the circumference. Thereby, it can suppress that the said specific position is overheated and damaged when light injects into the specific position of fluorescent substance intensively. As a result, the life of the light source device 10l can be extended.

(Configuration of rotating body)
Below, with reference to drawings, the structure of the rotary body 200l in FIG. 21 is demonstrated.

In the ninth embodiment, the rotating body 200l includes a plurality of rotating rings in which a phosphor is applied on each outer peripheral surface. The plurality of rotating rings are arranged side by side in the rotation axis direction. As shown in FIG. 22, the plurality of rotating rings include an R light rotating ring 210R as an R light fluorescent part, a G light rotating ring 210G as a G light fluorescent part, and a B light rotating ring 210B as a B light fluorescent part. It consists of.

The R light rotating ring 210R, the G light rotating ring 210G, and the B light rotating ring 210B are arranged in parallel in the rotation axis direction in that order. In the ninth embodiment, two R light rotating rings 210R, two G light rotating rings 210G, and two B light rotating rings 210B are arranged in that order.

FIG. 22 is a cross-sectional view of each rotating ring with a plane perpendicular to the arrangement direction of the rotating rings as a cut surface.

Referring to FIG. 22, R light rotating ring 210 </ b> R is arranged with an annular translucent base 210 and a predetermined angular range in the circumferential direction on the outer peripheral surface of translucent base 210. R photophosphor 220 </ b> R and a dichroic film 230.

The R phosphor 220R absorbs ultraviolet light and emits R light. The dichroic film 230 is disposed on the inner peripheral surface of the translucent substrate 210 at a position facing the R light phosphor 220R. The dichroic film 230 transmits the ultraviolet light emitted from the excitation laser light source 102 corresponding to the R light rotating ring 210R, while reflecting the R light emitted from the R light phosphor 220R.

The G light rotating ring 210G has an annular light transmitting base 210 and a G light phosphor 220G disposed on the outer peripheral surface of the light transmitting base 210 with a predetermined angular range in the circumferential direction. And a dichroic film 230.

The G light phosphor 220G absorbs ultraviolet light and emits G light. The dichroic film 230 is disposed on the inner peripheral surface of the translucent substrate 210 at a position facing the G light phosphor 220G. The dichroic film 230 transmits the ultraviolet light emitted from the excitation laser light source 102 corresponding to the G light rotating ring 210G, while reflecting the G light emitted from the G light phosphor 220G.

The B light rotating ring 210B includes an annular light transmitting base 210 and a B light phosphor 220B arranged on the outer peripheral surface of the light transmitting base 210 with a predetermined angular range in the circumferential direction. And a dichroic film 230.

The B photophosphor 220B absorbs ultraviolet light and emits B light. The dichroic film 230 is disposed on the inner peripheral surface of the translucent substrate 210 at a position facing the B photophosphor 220B. The dichroic film 230 transmits the ultraviolet light emitted from the excitation laser light source 102 corresponding to the B light rotating ring 210B, while reflecting the B light emitted from the B light phosphor 220B.

The R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B are disposed so as to have different angular ranges in the circumferential direction when viewed from the rotation axis direction. That is, when the sectional views of the rotating

rings

210R, 210G, and 210B are virtually overlapped, the

respective color phosphors

220R, 220G, and 220B are arranged so as to be adjacent to each other in the circumferential direction in the order of R, G, and B. Is done.

The ratio of the angle range occupied by the R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B is set according to the mixing ratio of the R light, the G light, and the B light to obtain white light. be able to. For example, when the mixing ratio of R light, G light, and B light is 1: 2: 1, the ratio of the angle ranges of the

respective color phosphors

220R, 220G, 220B may be 1: 2: 1. The ratio of the angle range can be set in consideration of the light emission characteristics of the

respective color phosphors

220R, 220G, and 220B in accordance with the mixing ratio of the respective color lights.

In the above configuration, when the rotating body 200l is rotated, excitation light (ultraviolet light) from the excitation laser light source 102 corresponding to each of the R light rotation ring 210R, the G light rotation ring 210G, and the B light rotation ring 210B. Incident. The excitation light is periodically absorbed in the order of the R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B.

Specifically, FIG. 22 shows a state where excitation light is absorbed by the G light phosphor 220G, FIG. 23 shows a state where excitation light is absorbed by the R light phosphor 220R, and FIG. The excitation light is shown as being absorbed by the B light phosphor 220B. The rotating body 200l periodically transitions these three states in that order. As a result, R light, G light, and B light are periodically emitted in this order from the rotating body 200l.

Referring to FIG. 21 again, the R light, G light, and B light emitted from the rotating body 200l are collected by the condenser lens 112, and then transmitted through the dichroic prism 114 (FIG. 1). 80 is incident in a time division manner. The B light from the first LED 104, the R light from the second LED 106, and the G light from the phosphor 220 emitted from the translucent rod 80 are applied to the DMD 124 (FIG. 17). The DMD 124 controls each micromirror in synchronization with the timing at which the R light, G light, and B light are irradiated. The color light reflected by the DMD 124 is projected onto the screen via the projection lens 3.

In the ninth embodiment, the rotational frequency of the phosphor rotating drum 110l is set to the same frequency as the frame frequency (for example, 120 Hz) of the projector.

As described above, according to the ninth embodiment of the present invention, the phosphor rotating drum is excited by arranging a plurality of phosphors each emitting a plurality of colored lights on the outer peripheral surface of the phosphor rotating drum. The light emitted from the laser light source can be absorbed and the R light, the G light, and the B light can be emitted in time division in order.

Moreover, even when the number of excitation laser light sources is increased from the viewpoint of increasing the brightness, the luminous flux is aggregated for each excitation laser light source, and is condensed and irradiated on the phosphors. The light emitting area can be made constant. As a result, even if the amount of illumination light is increased, the etendue value does not increase, and it is possible to achieve both higher luminance and improved light utilization efficiency.

Note that the plurality of excitation laser light sources may be configured to emit laser beams having the same wavelength, or may be configured to emit laser beams having different wavelengths. For example, for each excitation laser light source, the wavelength of the laser light may be set so that the conversion efficiency to the color light is increased according to the wavelength of the color light emitted from the corresponding phosphor. In this case, the light utilization efficiency can be further increased.

(Example of change)
FIG. 25 is a diagram illustrating the configuration of an optical engine 2m according to a modification of the ninth embodiment of the present invention.

25, the optical engine 2m according to this modification is different from the optical engine 2l shown in FIG. 20 in that a light source device 10m is provided instead of the light source device 10l.

The light source device 10m includes a plurality of (for example, three) excitation laser light sources 1021, a condenser lens 108, and a phosphor rotating drum 110m.

The excitation laser light source 1021 can emit high-power laser light as compared with the excitation laser light source 102 shown in FIG. In this modified example, three excitation laser light sources 1021 are arranged at a predetermined distance, and each emits laser light including ultraviolet light.

The condenser lens 108 is provided corresponding to each excitation laser light source 1021. The condensing lens 108 condenses the light emitted from the corresponding excitation laser light source 1021 and causes the light to enter the phosphor rotating drum 110m.

The phosphor rotating drum 110m includes three fluorescent sections that receive light emitted from the three excitation laser light sources 1021 and emit R light, G light, and B light, respectively. As will be described later, the three fluorescent portions are formed by arranging a plurality of rotating rings each having a fluorescent material coated on the outer peripheral surface thereof in the direction of the rotation axis.

In such a configuration, the light emitted from the excitation laser light source 1021 is condensed on the outer peripheral surface of the corresponding rotating ring (fluorescent portion) by the refracting action of the condenser lens 108. Thereby, the light which can be utilized effectively for excitation of a fluorescent substance for every fluorescent part can be supplied efficiently.

The R light, G light, and B light emitted from the three rotating rings are converted into substantially parallel light by the collimation lens 112m, and then enter the dichroic cube 115. The mirror 113 guides the light emitted from the collimation lens 112 m to the dichroic cube 115. The dichroic cube 115 combines the R light, the G light, and the B light, and emits the combined light toward the condenser lens 117. The condensing lens 117 condenses incident light and makes it incident on one end of the translucent rod 80.

(Configuration of light source device)
The configuration of the light source device 10m mounted on the optical engine 2m according to the modification of the ninth embodiment will be described below with reference to the drawings. FIG. 26 is a diagram illustrating the configuration of the light source device 10m in FIG.

Referring to FIG. 26, phosphor rotating drum 110m differs from phosphor rotating drum 110l shown in FIG. 21 only in that it includes rotating body 200m instead of rotating body 200l.

The rotating body 200m is formed in a hollow cylindrical shape using heat-resistant glass or the like as a base material, and receives light emitted from three excitation laser light sources 1021 on the outer peripheral surface thereof. Specifically, the rotating body 200m includes an R light rotating ring as an R light fluorescent part, a G light rotating ring as a G light fluorescent part, and a B light rotating ring as a B light fluorescent part arranged in the rotation axis direction. It is installed and configured. The R light rotating ring, the G light rotating ring, and the B light rotating ring have the same structures as the R light rotating ring 210R, the G light rotating ring 210G, and the B light rotating ring 210B shown in FIG. However, the rotation ring according to this modification has a wider width in the rotation axis direction than the rotation ring shown in FIG.

In the above configuration, when the rotating body 200m is rotated, excitation light (ultraviolet light) from the corresponding excitation laser light source 1021 is incident on the R light rotation ring, the G light rotation ring, and the B light rotation ring, respectively. . The excitation light is periodically absorbed in the order of the R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B (see FIGS. 22 to 24).

At this time, the irradiation position of the light incident on the

respective color phosphors

220R, 220G, and 220B moves temporally on the circumference around the rotation axis 300. Since the excitation laser light source 1021 emits high-output excitation light, the condensing lens 108 condenses the excitation light on each color phosphor, so that the emission area of the phosphor can be reduced while the thermal load increases. There is a risk of damage. Therefore, in the light source device 10m according to this modification, thermal damage is suppressed by increasing the area of the condensing point of the high-output excitation light. In addition, the width of the rotating ring in the direction of the rotation axis is increased as the area of the condensing point of the excitation light is increased. Thereby, the lifetime of the light source device 10m can be extended while increasing the luminance.

[Embodiment 10]
FIG. 27 is a view for explaining the configuration of an optical engine 2n according to Embodiment 10 of the present invention.

Referring to FIG. 27, optical engine 2n is different from optical engine 2l shown in FIG. 20 in that light source device 10n is provided instead of light source device 10l. More specifically, in comparison with the light source device 10l, the light source device 10n has a wavelength when the excitation light is reflected instead of the transmissive phosphor rotating drum 110l that is wavelength-converted when the excitation light is transmitted. The difference is that a reflective phosphor rotating drum 110n to be converted is included.

The light source device 10n includes an excitation laser light source 102, a phosphor rotating drum 110n, a condenser lens 111, and a dichroic mirror 119.

The excitation laser light source 102 emits excitation light (ultraviolet light). The dichroic mirror 119 is disposed at an angle at which excitation light emitted from the excitation laser light source 102 is incident at 45 °, and has an optical characteristic of reflecting visible light while reflecting ultraviolet light. ing. The excitation light reflected by the dichroic mirror 119 is condensed on the outer peripheral surface of the phosphor rotating drum 110n by the refracting action of the condenser lens 111. Thereby, the light which can be effectively used for excitation of the phosphor in the phosphor rotating drum 110n can be efficiently supplied.

The phosphor rotating drum 110n includes a rotating shaft 300n orthogonal to the optical axis of the excitation light (corresponding to a direction perpendicular to the drawing sheet), and a rotating body 200n that is rotatable about the rotating shaft 300n.

Rotating body 200n is connected to a motor (not shown). By rotating the motor, the rotating body 200n rotates about the rotation shaft 300n. The rotating body 200n is formed in a hollow cylindrical shape using heat-resistant glass or the like as a base material, and receives light emitted from the excitation laser light source 102 on the outer peripheral surface thereof.

By rotating the rotator 200n in this manner, the irradiation position of light incident on a phosphor (not shown) arranged on the outer peripheral surface of the rotator 200n takes time on the circumference around the rotation axis 300n. Will move. Thereby, it can suppress that the said specific position is overheated and damaged when light injects into the specific position of fluorescent substance intensively.

FIG. 28 is a diagram illustrating the configuration of the rotating body 200n in FIG. FIG. 28A is a cross-sectional view in a direction perpendicular to the rotating shaft 300n (corresponding to a direction horizontal to the drawing sheet), and FIG. 28B is an enlarged view of the outer peripheral portion of the rotating body 200n.

Referring to FIG. 28A, a rotating body 200n includes a cylindrical translucent substrate 210 extending in the rotation axis direction, and a phosphor disposed over the entire outer peripheral surface of the translucent substrate 210. , And mirror film 232.

The phosphor includes an R light phosphor 220R, a G light phosphor 220G, and a B light phosphor 220B. The R light phosphor 220R emits R light when excited by ultraviolet light. The G light phosphor 220G is excited by ultraviolet light and emits G light. The B light phosphor 220B is excited by ultraviolet light to emit B light.

The R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B are arranged on the outer peripheral surface of the translucent substrate 210 in the arrangement shown in FIG. Specifically, the R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B are arranged so as to be adjacent to each other in the circumferential direction in that order, and have different angle ranges. .

respective color phosphors

The mirror film 232 is disposed over the entire inner peripheral surface of the translucent substrate 210. The mirror film 232 is a visible light reflecting member that reflects visible light emitted from the

respective color phosphors

220R, 220G, and 220B.

FIG. 28 (b) shows an enlarged view of the region RGN2 surrounded by a broken line in FIG. 28 (a). As shown in FIG. 28B, excitation light condensed by the condenser lens 111 is incident on the R, G, and B phosphors (for example, the G light phosphor 220G). The G light phosphor 220G absorbs this excitation light and emits G light. At this time, since the emitted light of the G light phosphor 220G is isotropic radiated light, light traveling inward in the radial direction is also generated in addition to light traveling outward in the radial direction of the rotating body 200n. The mirror film 232 is formed so as to reflect the light traveling inward in the radial direction. Therefore, the emitted light of the G light phosphor 220G can be efficiently incident on the condenser lens 111, and the light use efficiency of the light source device 10n can be increased.

In addition, since the excitation light condensed by the condenser lens 111 is configured to be incident on the

respective color phosphors

220R, 220G, and 220B, light that can be effectively used for excitation (wavelength conversion) in the phosphor 220 increases. A light emitting unit close to a point light source can be realized. As a result, light utilization efficiency is improved.

In the above configuration, when the rotator 200n rotates about the rotation axis 300n, the incident positions of the excitation light incident on the phosphor are the R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B. It changes periodically in this order. As a result, the rotating body 200n periodically emits R light, G light, and B light in that order. R light, G light, and B light periodically emitted from the rotating body 200 n are collected by the condenser lens 111. Each color light condensed by the condenser lens 111 passes through the dichroic mirror 119 and enters one end of the translucent rod 80 (FIG. 28).

As described above, according to the tenth embodiment of the present invention, a plurality of phosphors each emitting a plurality of colored lights in the circumferential direction are arranged in parallel on the outer circumferential surface of the phosphor rotating drum, thereby Light emitted from the laser light source can be converted into illumination light composed of R light, G light, and B light by time division using a phosphor rotating drum. Therefore, the light source device can be configured only from a single excitation laser light source, and the light source device can be reduced in size.

Also in the tenth embodiment, the excitation light emitted from the excitation laser light source can be condensed on the phosphor, whereby the wavelength can be efficiently converted by the phosphor, and the light emitted from the phosphor can be converted. Since the light can be efficiently directed to the emission side, the light use efficiency can be increased, and the luminance of the illumination light is improved. As a result, a light source device that is small and has high brightness and high efficiency can be realized.

(Example of change)
FIG. 29 is a diagram illustrating the configuration of a rotating body 200p included in a light source device according to a modification of the tenth embodiment of the present invention. FIG. 29A is a cross-sectional view in a direction perpendicular to a rotation axis (not shown) (corresponding to a direction horizontal to the drawing sheet), and FIG. 29B is an enlarged view of the outer peripheral portion of the rotating body 200p. FIG.

Referring to FIG. 29 (a), a rotator 200p includes a cylindrical translucent substrate 210 extending in the direction of the rotation axis, and a phosphor disposed over the entire outer peripheral surface of the translucent substrate 210. , And mirror film 232.

The phosphor includes an R light phosphor 220R, a G light phosphor 220G, a B light phosphor 220B, and a Ye light phosphor 220Ye that emits Ye light when excited by ultraviolet light.

The R light phosphor 220R, the G light phosphor 220G, the B light phosphor 220B, and the Ye light phosphor 220Ye are arranged on the outer peripheral surface of the translucent substrate 210 in the arrangement shown in FIG. . Specifically, the R light phosphor 220R, the Ye light phosphor 220Ye, the G light phosphor 220G, and the B light phosphor 220B are arranged so as to be adjacent to each other in the circumferential direction in that order, and are at different angles. Have a range.

Note that the ratio of the angle ranges occupied by the R light phosphor 220R, the G light phosphor 220G, the B light phosphor 220B, and the Ye light phosphor 220Ye is R light, G light, B light, and Ye for obtaining white light. It can be set according to the mixing ratio of light. For example, when the mixing ratio of R light, G light, B light, and Ye light is 1: 1: 1: 1, the ratio of the angular ranges of the

respective color phosphors

220R, 220G, 200B, and 220Ye is 1: 1: 1. : 1. The ratio of the angle range can be set in consideration of the light emission characteristics of the

respective color phosphors

220R, 220G, 220B, and 220Ye in combination with the mixing ratio of the respective color lights.

The mirror film 232 is disposed over the entire inner peripheral surface of the translucent substrate 210, and reflects visible light emitted from the

color phosphors

220R, 220G, 220B, and 220Ye. *

FIG. 29 (b) shows an enlarged view of the region RGN3 surrounded by a broken line in FIG. 29 (a). As shown in FIG. 29B, the excitation light condensed by the condenser lens 117 is incident on the Ye light phosphor 220Ye. The Ye light phosphor 220Ye absorbs this excitation light and emits Ye light. The mirror film 232 reflects light traveling inward in the radial direction of the rotating body 200p out of Ye light emitted from the Ye light phosphor 220Ye.

In the above configuration, when the rotator 200p rotates about a rotation axis (not shown), the irradiation position of the excitation light incident on the phosphor is R light phosphor 220R, Ye light phosphor 220Ye, G light phosphor. It changes periodically in the order of 220G and B photophosphor 220B. As a result, the rotating body 200p periodically emits R light, Ye light, G light, and B light in that order. R light, Ye light, G light, and B light periodically emitted from the rotating body 200p are collected by the condenser lens 117. Each color light condensed by the condenser lens 117 passes through the dichroic mirror 119 and enters one end of the translucent rod 80 (FIG. 27).

As described above, according to this modification, the light emitted from the excitation laser light is converted into illumination light composed of R light, G light, B light, and Ye light by time division using the phosphor rotating drum. can do. Of these, Ye light is light that can reproduce colors outside the color range in which R light, G light, and B light can be reproduced on the chromaticity diagram. Therefore, according to the light source device according to the present modification, the color range that can be reproduced on the chromaticity diagram is widened, so that the color reproducibility of the displayed image is improved. Further, the Ye light is added to the R light, the G light, and the B light, so that the brightness of the displayed image is improved.

[Embodiment 11]
FIG. 30 is a diagram schematically showing the configuration of the main part of the projector using the light source device according to Embodiment 11 of the present invention for the light source system. In contrast to the projectors according to the eighth to tenth embodiments, the projector according to the eleventh embodiment of the present invention uses a single light modulation element in common by switching R, G, and B colors in a time division manner. Instead of the single plate method, it is different in that it is changed to a three plate method including light modulation elements dedicated to R, G, and B colors.

Referring to FIG. 30, a projector according to an eleventh embodiment of the present invention is a projector that projects an image using a liquid crystal device, and includes an optical engine 2q and a projection lens 3, and has an outer casing. Covered with a body (not shown). The projector is also equipped with components such as a speaker for outputting sound, a circuit board for electrically controlling the components of the optical engine 2q and the sound output means, but in FIG. The illustration of some components including these is omitted.

The optical engine 2q includes a light source device 10q. The light source device 10q has the same basic configuration as the light source device 10n described with reference to FIG. 27, and includes a reflective phosphor rotating drum 110q that converts the wavelength when excitation light is reflected.

The light source device 10q includes an excitation laser light source 102, a phosphor rotating drum 110q, a condenser lens 111, and a dichroic mirror 119.

The excitation laser light source 102 emits excitation light (ultraviolet light). The dichroic mirror 119 reflects the excitation light emitted from the excitation laser light source 102 and transmits visible light whose wavelength is converted from the excitation light. The excitation light reflected by the dichroic mirror 119 is condensed on the outer peripheral surface of the phosphor rotating drum 110q by the refracting action of the condenser lens 111. Thereby, the light which can be effectively used for excitation of the phosphor in the phosphor rotating drum 110q can be efficiently supplied.

The phosphor rotating drum 110q includes a rotating shaft 300q orthogonal to the optical axis of the excitation light (corresponding to a direction perpendicular to the drawing sheet), and a rotating body 200q that is rotatable about the rotating shaft 300q.

Rotating body 200q is connected to a motor (not shown). By rotating the motor, the rotating body 200q rotates about the rotation shaft 300q. Rotating body 200q is formed in a hollow cylindrical shape using heat-resistant glass or the like as a base material, and receives light emitted from excitation laser light source 102 on the outer peripheral surface thereof.

In the eleventh embodiment, the rotating body 200q absorbs light emitted from the excitation laser light source 102 and emits R light, G light, and B light. Each color light emitted from the rotating body 200q is condensed by the condenser lens 111. Each color light condensed by the condenser lens 111 passes through the dichroic mirror 119 and enters the fly eye integrator 11.

The light from the light source device 10 q is incident on a PBS (polarized beam splitter) array 12 and a condenser lens 13 via the fly eye integrator 11. The fly-eye integrator 11 includes a fly-eye lens made up of a lens group having a corrugated eye shape. Add optical action.

The dichroic mirror 14 transmits only the B light among the light incident from the condenser lens 13 and reflects the R light and the G light. The B light transmitted through the dichroic mirror 14 is guided to the mirror 15, reflected there, and incident on the condenser lens 16.

relay lenses

27, 29, 31 for adjusting the optical path length and the two

mirrors

liquid crystal panels

(Configuration of light source device)
Hereinafter, the configuration of the phosphor rotating drum 110q used in the light source device 10q in FIG. 30 will be described with reference to the drawings.

In FIG. 30, the rotating body 200q includes a plurality of fluorescent portions that each receive light emitted from the excitation laser light source 102 and emit R light, G light, and B light. As shown in FIG. 31, the plurality of fluorescent portions are formed by arranging a plurality of rotating rings each having a fluorescent material coated on each outer peripheral surface in the rotation axis direction.

FIG. 31 is a cross-sectional view of each rotating ring with a plane perpendicular to the direction in which the rotating rings are arranged.

Referring to FIG. 31, rotating body 200q includes a plurality of (for example, three) rotating rings 212_1, 212_2, and 212_3. In the figure, for easy understanding, the rotating rings 212_1, 212_2, and 212_3 are displayed while being shifted in parallel with the rotating shaft. However, in actuality, these rotating rings are arranged in parallel in the rotating shaft direction. Is.

The rotating rings 212_1, 212_2, 212_3 have the same shape. Hereinafter, the reference numeral 212 is used to collectively refer to the rotating rings 212_1, 212_2, and 212_3.

The rotating ring 212 includes an annular translucent substrate 210, a phosphor disposed over the entire outer peripheral surface of the translucent substrate 210, and a mirror film 232.

The phosphor includes an R light phosphor 220R, a G light phosphor 220G, and a B light phosphor 220B. The R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B are arranged on the outer peripheral surface of the translucent substrate 210 in the arrangement shown in FIG. Specifically, the R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B are arranged so as to be adjacent to each other in the circumferential direction in that order, and have different angle ranges. .

The mirror film 232 is disposed over the entire inner peripheral surface of the translucent substrate 210. The mirror film 232 reflects visible light emitted from the

respective color phosphors

220R, 220G, and 220B.

As the rotating ring 212 rotates around the rotation axis 300q, the irradiation position of the excitation light incident on the phosphor is periodically in the order of the R light phosphor 220R, the G light phosphor 220G, and the B light phosphor 220B. Change. As a result, the rotating ring 212 periodically emits R light, G light, and B light in that order.

In the eleventh embodiment, the plurality of rotating rings 212_1, 212_2, and 212_3 are arranged so that phosphors of different color lights are adjacent to each other in the rotation axis direction. Specifically, the R light phosphor 220R of the rotating ring 212_1, the G light phosphor 220G of the rotating ring 212_2, and the B light phosphor 220B of the rotating ring 212_3 are arranged adjacent to each other in the rotation axis direction.

Therefore, when the rotating body 200q rotates around the rotation axis 300q, the rotating rings 212_1, 212_2, and 212_3 emit R light, G light, and B light, respectively. Since each of the rotating rings 212_1, 212_2, and 212_3 periodically emits light in the order of R light, G light, and B light, the entire rotating body 200q always emits R light, G light, and B light. It will be emitted.

The R light, G light, and B light emitted from the rotating body 200q are collected by the condenser lens 111. Each color light condensed by the condenser lens 117 passes through the dichroic mirror 119 and enters the fly eye integrator 11 (FIG. 30).

The light from the light source device 10 q is incident on a PBS (polarized beam splitter) array 12 and a condenser lens 13 via the fly eye integrator 11.

As described above, according to the eleventh embodiment of the present invention, a rotating ring in which a plurality of phosphors each emitting a plurality of color lights in the circumferential direction is arranged, and phosphors of different color lights are arranged in the rotation axis direction. By arranging them side by side, the light emitted from the excitation laser light source can be converted into illumination light composed of combined light of R light, G light, and B light using a phosphor rotating drum. .

Also in the eleventh embodiment, the excitation light emitted from the excitation laser light source is condensed on the phosphor, whereby the wavelength can be efficiently converted by the phosphor, and the light emitted from the phosphor can be converted. Since the light can be efficiently directed to the emission side, the light use efficiency can be increased, and the luminance of the illumination light is improved. As a result, a light source device with high brightness and high efficiency can be realized.

(Example of change)
FIG. 32 is a diagram illustrating the configuration of a rotating body 200r provided in a light source device according to a modification of Embodiment 11 of the present invention.

Referring to FIG. 32, the rotating body 200r according to the present modification example includes four rotating rings 214_1 to 214_4 instead of the three rotating rings 212_1 to 212_3 as compared to the rotating body 200q illustrated in FIG. It differs in that it is configured.

FIG. 32 is a cross-sectional view of each rotating ring with a plane perpendicular to the direction in which the rotating rings are arranged. In the figure, for the sake of easy understanding, the rotating rings 214_1 to 214_4 are displayed while being shifted in parallel to the rotating shaft. However, in actuality, these rotating rings are arranged in parallel in the rotating shaft direction. It is.

The rotating rings 214_1 to 214_4 have the same shape. Hereinafter, the reference numeral 214 is used to collectively refer to the rotating rings 214_1 to 214_4.

The rotating ring 214 includes an annular translucent substrate 210, a phosphor disposed over the entire outer peripheral surface of the translucent substrate 210, and a mirror film 232.

The phosphor includes an R light phosphor 220R, a G light phosphor 220G, a B light phosphor 220B, and a Ye light phosphor 220Ye. The R light phosphor 220R, the G light phosphor 220G, the B light phosphor 220B, and the Ye phosphor 220Ye are arranged on the outer peripheral surface of the translucent substrate 210 in the arrangement shown in FIG. Specifically, the R light phosphor 220R, the G light phosphor 220G, the B light phosphor 220B, and the Ye phosphor 220Ye are arranged so as to be adjacent to each other in the circumferential direction in that order, and each has a different angular range. have.

respective color phosphors

220R, 220G, 220B, and 220Ye.

By rotating the rotating ring 214 around a rotation axis (not shown), the irradiation position of the excitation light incident on the phosphor is the R light phosphor 220R, the G light phosphor 220G, the B light phosphor 220B, It changes periodically in the order of Ye photophosphor 220Ye. As a result, the rotating ring 214 periodically emits R light, G light, B light, and Ye light in that order.

In this modification, the plurality of rotating rings 214_1 to 214_4 are arranged so that phosphors of different color lights are adjacent to each other in the direction of the rotation axis. Specifically, the R phosphor 220R of the rotating ring 214_1, the G phosphor 220G of the rotating ring 214_4, the B phosphor 220B of the rotating ring 214_3, and the Ye phosphor 220Ye of the rotating ring 214_4 are adjacent to each other in the rotation axis direction. Are arranged so that

Therefore, when the rotating body 200r rotates around the rotation axis, the rotating rings 214_1 to 214_4 emit R light, G light, B light, and Ye light, respectively. Since each of the rotating rings 214_1 to 214_4 periodically emits light in the order of R light, G light, B light, and Ye light, the entire rotating body 200r always has R light, G light, and B light. , Ye light is emitted.

The R light, G light, B light, and Ye light emitted from the rotating body 200r are condensed by the condenser lens 111. Each color light condensed by the condenser lens 117 passes through the dichroic mirror 119 and enters the fly eye integrator 11 (FIG. 30).

The light from the light source device 10 r enters the PBS (polarized beam splitter) array 12 and the condenser lens 13 via the fly eye integrator 11.

As described above, according to this modification, the light emitted from the excitation laser beam is converted into illumination light composed of the combined light of R light, G light, B light, and Ye light using the phosphor rotating drum. can do. Thereby, according to the light source device which concerns on this example of a change, the color reproducibility of the image displayed is improved by expanding the range of the color which can be reproduced on a chromaticity diagram. Further, the Ye light is added to the R light, the G light, and the B light, so that the brightness of the displayed image is improved.

In this modification, the configuration using Ye light as the fourth color light in addition to the R light, G light, and B light is exemplified, but the fourth color light is not limited to this. For example, the fourth color light may be cyan light or magenta light. Alternatively, a plurality of color lights may be used besides the single color light.

In the above eighth to eleventh embodiments, the example in which the light source device according to the present invention is applied to a projector as a projection video display device has been described. However, the present invention is not limited to this. Further, the configuration of the projector is not limited to the configuration described in the above embodiment.

Further, in the above eighth to eleventh embodiments, the solid light source that emits the excitation light is described as the laser light source that emits the ultraviolet light. However, the present invention is not limited to this. For example, the solid light source may be constituted by a laser light source that emits blue laser light.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

2,2k-2q optical engine, 3 projection lens, 8 reflecting mirror, 10, 10a-10r light source device, 11 fly eye integrator, 12 PBS array, 13, 16, 22, 26 condenser lens, 14, 21, 55, 61b , 61c, 119, dichroic mirror, 15, 28, 30, 113, 126 mirror, 18, 24, 33 liquid crystal panel, 19, 25, 34 exit side polarizing plate, 20, 114 dichroic prism, 17, 23, 32 incident side polarization Plate, 27, 29, 31 relay lens, 50c-50e, 61 reflecting mirror, 50, 50a, 50b, 50g, 50j-50l solid light source, 51, 57, 63, 300, 300n, 300q rotating shaft, 52, 80 through Optical rod, 53 eccentric lens, 54, 108, 11 , 112, 116, 117, 118 condenser lens, 56, 56i, 1100 reflector, 58 support, 60, 60g, 60h, 220, 220R, 220G, 200B, 220Ye, 600R, 600G, 600B, 620R, 620G, 620B phosphor, 62 phosphor installation part, 82 relay optical system, 84 light modulation element, 102, 1021 excitation laser light source, 110k to 110q phosphor rotating drum, 112m collimation lens, 115 dichroic cube, 200k to 200r rotating body, 210R, 210G, 210B, 212, 214, rotating ring, 210 translucent substrate, 230 dichroic film, 232 mirror film, 1000 arc tube.

Claims

A light source device;
A light modulation unit that modulates light emitted from the light source device based on the input video signal;
A projection unit that projects the light modulated by the light modulation unit,
The light source device is
A solid light source;
A phosphor that is excited by light emitted from the solid-state light source and emits light in the visible region;
A reflector for reflecting the light emitted by the phosphor and emitting it in a predetermined direction;
Including a phosphor installation portion that installs the phosphor at a focal position of the reflector,
The projection display unit, wherein the phosphor installation unit includes a reflection unit for guiding light emitted from the phosphor to a reflection surface of the reflector.
2. The projection display apparatus according to claim 1, wherein the light source device further includes an irradiation position moving mechanism for continuously moving the irradiation position of the light emitted from the solid light source to the phosphor.
The irradiation position moving mechanism is
A rotation axis attached to the phosphor installation portion, parallel to the optical axis of the reflector;
Rotation for moving the irradiation position of the light emitted from the solid-state light source to the phosphor on the circumference centering on the rotation axis by rotating the phosphor installation portion around the rotation axis Including the mechanism,
3. The projection display apparatus according to claim 2, wherein the phosphor has a light incident surface in which a plurality of light emitting units that emit different colored lights are sequentially arranged along a circumferential direction centering on the rotation axis. 4. .
The solid state light source comprises at least one light source,
2. The projection display apparatus according to claim 1, wherein the at least one light source is arranged on an apex side of the reflector or an opening side of the reflector and emits light toward the inside of the reflector.
2. The projection display apparatus according to claim 1, wherein the light source device further includes a light collecting member for condensing the light emitted from the solid light source on the phosphor.
A solid light source;
A phosphor that is excited by light emitted from the solid-state light source and emits light in the visible region;
A reflector for reflecting the light emitted by the phosphor and emitting it in a predetermined direction;
A phosphor installation section that installs the phosphor at the focal position of the reflector;
The phosphor installation unit is a light source device having a reflection unit for guiding light emitted from the phosphor to a reflection surface of the reflector.
A light source device;
A light modulation unit that modulates light emitted from the light source device based on the input video signal;
A projection unit that projects the light modulated by the light modulation unit,
The light source device is
A solid light source;
A rotating body whose axis of rotation is an axis orthogonal to the optical axis of the solid-state light source;
A projection display apparatus, comprising: a phosphor that is provided on an outer peripheral surface of the rotating body and is excited by light emitted from the solid light source to emit light in a visible range.
The rotating body includes a cylindrical translucent substrate that is driven to rotate about the rotation axis,
The phosphor is disposed on the outer peripheral surface of the translucent substrate with a predetermined angular range in the circumferential direction,
The light source device is
The solid light source is emitted by reflecting the light emitted from the phosphor toward the outer side in the radial direction of the rotating body, disposed at a position facing the phosphor on the inner peripheral surface of the translucent substrate. The projection display apparatus according to claim 7, further comprising a dichroic film that transmits the transmitted light.
The phosphor includes a plurality of fluorescent portions that are arranged side by side along a rotation axis direction and receive light emitted from the solid-state light source to emit a plurality of colored lights, respectively.
The projection according to claim 8, wherein the plurality of fluorescent parts are arranged on the outer peripheral surface of the translucent substrate so as to have different angular ranges in the circumferential direction when viewed from the rotation axis direction. Type image display device.
The rotating body includes a cylindrical translucent substrate that is driven to rotate about the rotation axis,
The phosphor is disposed over the entire outer peripheral surface of the translucent substrate,
The light source device is
The projection according to claim 7, further comprising a reflective film that is disposed over the entire inner peripheral surface of the translucent substrate and reflects light emitted from the phosphor toward the outside in the radial direction of the rotating body. Type image display device.
The phosphor includes a plurality of fluorescent portions that are arranged side by side along a circumferential direction and emit light of a plurality of color lights in response to light emitted from the solid-state light source,
11. The projection display apparatus according to claim 10, wherein the plurality of fluorescent portions are arranged on the outer peripheral surface of the translucent substrate so as to have different angular ranges in the circumferential direction.
A solid light source;
A rotating body whose axis of rotation is an axis orthogonal to the optical axis of the solid-state light source;
A light source device comprising: a phosphor that is provided on an outer peripheral surface of the rotating body and is excited by light emitted from the solid light source to emit light in a visible range.