JP2012078707A - Light source device and projector - Google Patents

Abstract

Provided are a light source device and a projector capable of suppressing a phosphor from becoming high temperature and suppressing a decrease in conversion efficiency to fluorescence.
A base 51, a light source 10 that emits first light, and a light source that is disposed on the base 51 and is excited by the first light emitted by the light source 51 and having a color different from that of the first light. The phosphor part 30 that emits the second light and having the first unevenness formed on the surface, and the cooling medium is introduced into the phosphor part 30 obliquely with respect to the phosphor part 30 toward the first unevenness. Cooling means 40 for cooling the air.
[Selection] Figure 2

Description

  The present invention relates to a light source device and a projector.

  In recent years, laser light sources have attracted attention as high-efficiency light sources with a wide color gamut for high performance projectors. For example, the light source device of Patent Document 1 includes a laser light source for B light, and a color wheel that generates G light and R light as fluorescence by exciting a phosphor with laser light emitted from the laser light source. , G, B illumination light.

JP 2009-277516 A

  However, in order to obtain a high output, by increasing the output of the irradiation light applied to the phosphor, the calorific value of the phosphor increases and the phosphor becomes high temperature. When the phosphor becomes high temperature, the conversion efficiency to fluorescence decreases, and the brightness decreases.

  The present invention has been made in view of such circumstances, and provides a light source device and a projector capable of suppressing a phosphor from becoming high temperature and suppressing a decrease in conversion efficiency to fluorescence. For the purpose.

  In order to solve the above problems, a light source device according to the present invention is disposed on a base, a light source that emits first light, and is excited by the first light emitted from the light source. A phosphor portion that emits second light of a color different from that of the first light, the surface having first irregularities formed thereon, and oblique to the phosphor portion toward the first irregularities Cooling means for introducing a cooling medium in the direction to cool the phosphor portion.

  According to this light source device, the cooling medium is introduced by the cooling means toward the first unevenness formed on the surface of the phosphor portion in an oblique direction with respect to the phosphor portion. For this reason, compared with the structure where the surface of a fluorescent substance part is flat, the thermal radiation area of a fluorescent substance part can be enlarged. Further, the introduction of the cooling medium into the first unevenness facilitates the generation of turbulent flow, and can enhance the effect of diffusing the heat generated in the phosphor portion. Further, since the cooling medium is introduced in an oblique direction with respect to the phosphor portion, the cooling medium is more easily guided to the entire phosphor portion than a configuration in which the cooling medium is introduced perpendicular to the phosphor portion. In addition, the cooling efficiency of the phosphor portion can be improved. Therefore, it is possible to provide a light source device capable of suppressing the phosphor from becoming high temperature and suppressing a decrease in conversion efficiency to fluorescence.

  In the light source device, the cooling unit may cool a portion where the second light is emitted from the phosphor portion.

  According to this light source device, since the portion that generates heat in the phosphor portion is directly cooled, the cooling efficiency of the phosphor portion can be improved.

  In the light source device, the base may be rotatable about a rotation axis parallel to a direction orthogonal to the upper surface of the base.

  According to this light source device, the irradiation point with respect to the fluorescent substance part of the 1st light inject | emitted by the light source is not fixed to one point. Therefore, the heat generated in the phosphor portion by the incidence of the first light can be dissipated in a wide region along the circumferential direction. Further, since the gas flows on the surface of the phosphor part as the substrate rotates, the cooling efficiency of the phosphor part can be improved. Furthermore, a vortex is formed due to the interaction between the flow of the gas on the surface of the phosphor portion generated by the rotation of the substrate and the flow of the cooling medium introduced in an oblique direction with respect to the phosphor portion. It tends to occur. Therefore, the effect of diffusing heat generated in the phosphor portion can be enhanced.

  In the light source device, the cooling means intersects a tangent line of the rotation locus at a portion where the cooling medium is introduced that is located on a rotation locus of the portion where the second light is emitted from the phosphor portion. The cooling medium may be introduced in a direction opposite to the direction of rotation of the substrate.

  According to this light source device, since the flow rate of the cooling medium flowing on the surface of the phosphor part is increased, the cooling efficiency of the phosphor part can be improved.

  In the light source device, the cooling means is parallel to a tangent to the rotation locus at a portion where the cooling medium is introduced that is positioned on a rotation locus of the portion where the second light is emitted from the phosphor portion. The cooling medium may be introduced in a direction opposite to the direction of rotation of the substrate.

  According to this light source device, the flow rate of the cooling medium that flows on the surface of the phosphor portion can be maximized, so that the cooling efficiency of the phosphor portion can be reliably improved.

  In the light source device, the cooling medium may be a gas.

  According to this light source device, compared with a configuration using liquid as a cooling medium (for example, a configuration including cooling water, piping, and a pump), a simple configuration (for example, a configuration in which air is blown by a fan) can be used. it can. Therefore, the phosphor portion can be easily cooled at a low cost.

  In the light source device, the cooling medium may be a liquid.

  According to this light source device, since the temperature change of the cooling medium is smaller than in the configuration using gas as the cooling medium, the phosphor portion can be stably and efficiently cooled.

  In the light source device, the first unevenness may include a plurality of recesses formed at irregular positions.

  According to this light source device, a turbulent flow is easily generated by introducing the cooling medium into the first unevenness. Therefore, the effect of diffusing heat generated in the phosphor portion can be enhanced.

  In the light source device, the first unevenness may include a plurality of recesses formed in an irregular shape or an irregular size.

  According to this light source device, a turbulent flow is easily generated by introducing the cooling medium into the first unevenness. Therefore, the effect of diffusing heat generated in the phosphor portion can be enhanced.

  In the light source device, the concave portion of the first unevenness is formed so as to have a length along a line that is projected on the upper surface of the substrate parallel to a direction in which the cooling unit introduces the cooling medium. In addition, the recess may be formed so that the inclination on the introduction side of the cooling medium in the longitudinal direction of the recess becomes gentle and the inclination on the discharge side of the cooling medium becomes steep.

  According to this light source device, the cooling medium introduced by the cooling means is accelerated by the gentle inclination of the concave portion, and the accelerated cooling medium collides with the steep inclination of the concave portion, so that a vortex is formed after derivation and strong. It becomes turbulent. Therefore, the effect of diffusing heat generated in the phosphor portion can be enhanced.

  In the light source device, the base may be formed of a material having a greater emissivity than the phosphor portion.

  According to this light source device, it is possible to improve the cooling efficiency of the phosphor portion by a radiation heat dissipation method.

  In the light source device, the base may be formed of a material having a higher thermal conductivity than the phosphor portion.

  According to this light source device, the heat generated in the phosphor portion is conducted through the substrate. The conducted heat is released from the surface of the substrate. Therefore, the cooling efficiency of the phosphor part can be improved.

  In the light source device, second unevenness may be formed on a surface of the base on which the phosphor portion is formed.

  According to this light source device, the conducted heat is transmitted to the outside from the second unevenness formed on the surface of the base on which the phosphor portion is formed. For this reason, compared with the structure where the surface of a base | substrate is flat, the thermal radiation area of the conducted heat can be enlarged. Moreover, a turbulent flow is easily generated by introducing the cooling medium into the second unevenness, and the effect of diffusing the conducted heat can be enhanced. Therefore, the cooling efficiency of the phosphor part can be improved.

  The projector of the present invention projects the light source device described above, the light modulation device that modulates the second light emitted from the light source device according to image information, and the modulated light from the light modulation device as a projection image. And a projection optical system.

  According to this projector, since the light source device described above is provided, it is possible to provide a projector capable of suppressing the phosphor from becoming high temperature and suppressing the decrease in the conversion efficiency to fluorescence.

It is a schematic diagram which shows the optical system of the projector which concerns on 1st Embodiment of this invention. It is a perspective view which shows the light source device which concerns on 1st Embodiment of this invention. It is a graph which shows the light emission characteristic of the light source and fluorescent substance which concern on 1st Embodiment of this invention. It is a schematic diagram which shows the base | substrate and fluorescent substance part which concern on 1st Embodiment of this invention. It is an enlarged plan view of a phosphor part. It is a figure which shows the manufacturing method of the fluorescent substance part which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the optical system of the projector which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the light source device which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the fluorescent substance part which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows the optical system of the projector which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the light source device which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows the optical system of the projector which concerns on 4th Embodiment of this invention. It is a perspective view which shows the light source device which concerns on 4th Embodiment of this invention. It is a figure which shows the modification of the fluorescent substance part which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, an actual structure and a scale, a number, and the like in each structure are different.

  In the following description, the XYZ rectangular coordinate system shown in FIG. 1 is set, and each member will be described with reference to this XYZ rectangular coordinate system.

(First embodiment)
FIG. 1 is a schematic diagram showing an optical system of a projector 1000 according to the first embodiment of the present invention. In FIG. 1, reference numeral 100ax denotes an illumination optical axis (the optical axis of light emitted from the light source device 1 toward the color separation light guide optical system 200). The optical axis refers to a virtual light beam that is representative of a light beam that passes through the entire system in the optical system.
FIG. 2 is a perspective view showing the light source device 1 according to the first embodiment of the present invention. In FIG. 2, the symbol P0 is a portion where the second light is emitted from the phosphor portion 30, the symbol P1 is a portion where a cooling medium located on the rotation locus of the P1 is introduced, and a symbol L1 is the portion P1. It is the tangent of the rotation trajectory.
FIG. 3 is a graph showing the light emission characteristics of the light source 10 and the phosphor 32 according to the first embodiment of the present invention. FIG. 3A is a graph showing the light emission characteristics of the light source, and FIG. 3B is a graph showing the light emission characteristics of the phosphor 32. The light emission characteristic is a characteristic of what wavelength light is emitted at what intensity when a voltage is applied in the case of a light source and when the first light is incident in the case of a phosphor. I mean. In FIG. 3, the vertical axis of the graph represents the relative light emission intensity, and the light emission intensity at the wavelength where the light emission intensity is strongest is 1. The horizontal axis of the graph represents the wavelength. In FIG. 3A, reference numeral B denotes a color light component that the light source emits blue light as the first light. In FIG. 3B, symbol R is a color light component that can be used as red light among the light emitted from the phosphor. Symbol G is a color light component that can be used as green light among the light emitted from the phosphor.

  As shown in FIG. 1, the projector 1000 includes a light source device 1, an illumination optical system 100, a color separation light guide optical system 200, three liquid crystal light modulation devices 400R, 400G, and 400B as light modulation devices, a cross A dichroic prism 500 and a projection optical system 600 are provided.

  The light source device 1 includes a light source unit 10, a condensing optical system 20, a base 51, a phosphor part 30, a motor 50, a cooling means 40, and a collimating optical system 60. .

  The light source unit 10 emits the first light B. The light source unit 10 includes a solid light source such as a laser light source and a light emitting diode (LED). In the present embodiment, a laser light source that emits blue light (peak of emission intensity: about 445 nm, see FIG. 3A) made of laser light is used as the light source. The light source unit 10 may include a single laser light source or a plurality of laser light sources. A light source that emits blue light having a wavelength other than 445 nm (for example, 460 nm) can also be used as the light source.

  The condensing optical system 20 is disposed in the optical path from the light source unit 10 to the base 51. The condensing optical system 20 includes a first lens 21 and a second lens 22. The first lens 21 and the second lens 22 are convex lenses. The condensing optical system 20 causes the blue light B to be incident on the phosphor portion 30 in a substantially condensed state.

  The phosphor part 30 is formed on the base 51. The phosphor portion 30 is excited by the first light B emitted from the light source unit 10 and emits second light (yellow light) having a color different from that of the first light (blue light).

Specifically, the phosphor part 30 converts part of the blue light from the light source unit 10 into light including red light and green light, and passes the remaining part of the blue light without conversion. . The phosphor 32 (see FIG. 4) is efficiently excited by blue light having a wavelength of about 445 nm and converted into yellow light (fluorescence) including red light and green light as shown in FIG. 3B. Eject. The phosphor 32 is made of particles containing, for example, (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce, which is a YAG phosphor. In addition, you may use the particle | grains containing the other fluorescent substance which inject | emits fluorescence containing red light and green light as fluorescent substance. Moreover, you may use the particle | grains containing the mixture of the fluorescent substance which converts 1st light into red light, and the fluorescent substance which converts 1st light into green light as fluorescent substance.

  The collimating optical system 60 is disposed in the optical path from the phosphor part 30 to the illumination optical system 100. The collimating optical system 60 includes a first lens 61 and a second lens 62. The first lens 61 and the second lens 62 are convex lenses. The collimating optical system 60 makes the light emitted from the phosphor part 30 incident on the illumination optical system 100 in a substantially parallel state.

  FIG. 4 is a schematic diagram showing the base 51 and the phosphor part 30 according to the first embodiment of the present invention. 4A is a front view of the base 51 and the phosphor portion 30, and FIG. 4B is a cross-sectional view taken along the line A1-A1 of FIG. 4A.

  The base 51 is a so-called transmission type disk. The base 51 is made of a material that transmits blue light B. As a material for forming the base 51, for example, quartz glass, quartz, sapphire, optical glass, transparent resin, or the like can be used.

  The phosphor portion 30 is continuously formed in a part of the base 51 along the circumferential direction of the base 51. The base 51 is connected to a driving device and is rotatable. Specifically, the base 51 has the shaft of the motor 50 fixed at the center, and the motor 50 can rotate around a direction parallel to the direction (Y-axis direction) orthogonal to the upper surface of the base 51. Yes.

  For example, the substrate 51 rotates at about 7500 rpm during use. The base 51 has a diameter of about 50 mm, and is configured such that the optical axis of the blue light B incident on the phosphor 50 overlaps with a position about 22.5 mm away from the center of the base 51. That is, the base 51 rotates at a rotation speed such that the blue light condensing spot moves on the phosphor 50 at about 18 m / sec.

  The phosphor part 30 is disposed on the base 51. The phosphor part 30 is formed by dispersing particles of the phosphor 32 in a binder (fixing material) 31 made of a material that transmits blue light B such as silicone resin or glass. On the surface of the phosphor part 30, first irregularities are formed.

  As shown in FIG. 2, the cooling means 40 is a so-called air cooling fan. The cooling means 40 is oblique to the phosphor portion 30 toward the first unevenness (concave portion 33) formed on the surface of the phosphor portion 30 (the direction obliquely intersecting the direction orthogonal to the upper surface of the base 51). ) To introduce a cooling medium (in this case, a gas such as air) to cool the phosphor portion 30.

  The cooling means 40 is in a direction intersecting with the tangent of the tangent L1 of the rotation locus in the portion P1 into which the cooling medium located on the rotation locus of the portion P0 where the second light is emitted from the phosphor part 30 is introduced. Thus, the cooling medium is introduced in the direction opposite to the rotation direction of the base 51.

  More preferably, the cooling means 40 is in a direction parallel to the tangent line L1 of the rotation locus in the portion P1 into which the cooling medium located on the rotation locus of the portion P0 where the second light is emitted from the phosphor portion 30 is introduced. Thus, the cooling medium is introduced in a direction (+ Z direction) opposite to the rotation direction (−Z direction) of the base body 51.

  FIG. 5 is an enlarged plan view of the phosphor portion. FIG. 5A is an enlarged plan view of the phosphor part 30 according to the first embodiment of the present invention, and FIG. 5B is an enlarged plan view showing a comparative example of the phosphor part.

  As shown to Fig.5 (a), the 1st unevenness | corrugation contains the several recessed part 33 formed in the irregular position. Further, the first unevenness includes a plurality of recesses 33 formed with an irregular shape or irregular size.

  On the other hand, as shown in FIG. 5B, the plurality of concave portions 33X of the first concave and convex portions according to the comparative example are arranged in the same row as viewed from the direction in which the cooling means introduces the cooling medium. That is, the plurality of concave portions 33X of the first concave and convex portions are arranged side by side in the Z-axis direction. In addition, the plurality of recesses 33X of the first unevenness according to the comparative example are formed in the same shape. That is, the plurality of concave portions 33X of the first concave and convex portions are each circular in a plan view, and each size is also the same.

  For this reason, according to the structure which concerns on this embodiment, it becomes easy to generate | occur | produce a turbulent flow by introduce | transducing a cooling medium into a 1st unevenness | corrugation compared with the structure which concerns on a comparative example.

FIG. 6 is a diagram showing a method for manufacturing the phosphor part according to the first embodiment of the present invention.
As shown in FIG. 6, in the method of manufacturing the phosphor portion 30, first, on a substrate 51, a binder (fixing material) 31 that transmits blue light is dispersed in phosphor particles 32. Deploy. Next, the plurality of recesses 33 are formed by pressing the mold 1030 on which the plurality of protrusions are formed against the upper surface of the binder 31 in a state where the binder 31 is uncured or semi-cured. Thereafter, the binder 31 is fully cured. Through the above steps, the phosphor part 30 having the first unevenness formed on the surface can be formed.

  As shown in FIG. 1, the illumination optical system 100 is disposed between the light source device 1 and the color separation light guide optical system 200. The illumination optical system 100 includes a first fly-eye lens 111 and a second fly-eye lens 112, a polarization conversion element 120, and a superimposing lens 130 that constitute an integrator optical system.

  The first fly-eye lens 111 and the second fly-eye lens 112 are each composed of a plurality of element lenses arranged in a matrix. The first fly-eye lens 111 divides the light (first light B and second light R, G) from the light source device 1 by a plurality of element lenses constituting the first fly-eye lens 111 and collects them individually. It has a function to shine. The second fly-eye lens 112 has a function of emitting the divided light flux from the first fly-eye lens 111 with an appropriate divergence angle by a plurality of element lenses constituting the second fly-eye lens 112.

  The polarization conversion element 120 is formed of an array having a PBS, a mirror, a retardation plate, etc. as a set of elements. The polarization conversion element 120 has a function of aligning the polarization direction of each partial light beam divided by the first fly-eye lens 111 with linear polarization in one direction.

  The superimposing lens 130 appropriately converges the illumination light passing through the polarization conversion element 120 as a whole, and enables superimposing illumination on the illuminated areas of the liquid crystal light modulation devices 400R, 400G, and 400B.

  The color separation light guide optical system 200 includes dichroic mirrors 210 and 220, reflection mirrors 230, 240 and 250, and relay lenses 260 and 270. The color separation light guide optical system 200 separates light (first light B and second light R, G) from the light source device 1 (illumination optical system 100) into red light, green light, and blue light, and the red light. It has a function of guiding each color light of light, green light and blue light to the liquid crystal light modulation devices 400R, 400G and 400B to be illuminated. Condensing lenses 300R, 300G, and 300B are disposed between the color separation light guide optical system 200 and the liquid crystal light modulation devices 400R, 400G, and 400B. The condenser lenses 300R, 300G, and 300B and the relay lenses 260 and 270 are part of the integrator optical system that constitutes the projector 1000.

  The dichroic mirrors 210 and 220 are mirrors in which a wavelength selective transmission film that reflects light in a predetermined wavelength region and transmits light in other wavelength regions is formed on a substrate. Specifically, the dichroic mirror 210 transmits a red light component and reflects a green light component and a blue light component. The dichroic mirror 220 reflects the green light component and transmits the blue light component.

  The reflection mirrors 230, 240, and 250 are mirrors that reflect incident light. Specifically, the reflection mirror 230 reflects the red light component transmitted through the dichroic mirror 210. The reflection mirrors 240 and 250 reflect the blue light component transmitted through the dichroic mirror 220.

  The red light transmitted through the dichroic mirror 210 is reflected by the reflection mirror 230, passes through the condenser lens 300R, and enters the image forming region of the liquid crystal light modulation device 400R for red light. The green light reflected by the dichroic mirror 210 is further reflected by the dichroic mirror 220, passes through the condenser lens 300G, and enters the image forming area of the liquid crystal light modulation device 400G for green light. The blue light transmitted through the dichroic mirror 220 passes through the relay lens 260, the incident-side reflecting mirror 240, the relay lens 270, the exit-side reflecting mirror 250, and the condensing lens 300B, thereby forming an image of the liquid crystal light modulation device 400B for blue light. Incident into the area.

  The relay lenses 260 and 270 and the reflection mirrors 240 and 250 have a function of guiding the blue light component transmitted through the dichroic mirror 220 to the liquid crystal light modulation device 400B. Thereby, even when the length of the optical path of blue light is longer than the length of the optical path of the other color light, it is possible to suppress a decrease in utilization efficiency of the blue light due to the divergence of the blue light. In addition, when the length of the optical path of other color light (for example, red light) is longer than the length of the optical path of blue light, the structure which arrange | positions the relay lenses 260 and 270 and the reflective mirrors 240 and 250 in the optical path of red light is also considered. It is done.

  The liquid crystal light modulation devices 400R, 400G, and 400B form color images by modulating incident color light in accordance with image information, and are the illumination target of the light source device 1. Although not shown, incident-side polarizing plates are disposed between the condenser lenses 300R, 300G, and 300B and the liquid crystal light modulators 400R, 400G, and 400B, respectively. Further, an exit-side polarizing plate is disposed between each of the liquid crystal light modulation devices 400R, 400G, and 400B and the cross dichroic prism 500. The incident-side color light is modulated by the incident-side polarizing plate, the liquid crystal light modulation devices 400R, 400G, and 400B and the emission-side polarizing plate.

  For example, the liquid crystal light modulation devices 400R, 400G, and 400B are transmissive liquid crystal light modulation devices in which liquid crystal is hermetically sealed in a pair of transparent substrates, and a polysilicon TFT is used as a switching element in accordance with a given image signal. Modulates the deflection direction of one type of linearly polarized light emitted from an incident side polarizing plate (not shown).

  The cross dichroic prism 500 is an optical element that forms a color image by synthesizing an optical image modulated for each color light emitted from an exit side polarizing plate (not shown). The cross dichroic prism 500 has a substantially square shape in plan view in which four right-angle prisms are bonded. A dielectric multilayer film is formed on the substantially X-shaped interface to which the right-angle prism is bonded. The dielectric multilayer film formed at one of the substantially X-shaped interfaces reflects red light, and the dielectric multilayer film formed at the other interface reflects blue light. By these dielectric multilayer films, the red light and the blue light are bent and aligned with the traveling direction of the green light, so that the three color lights are synthesized.

  The color image emitted from the cross dichroic prism 500 is enlarged and projected by the projection optical system 600 to form an image on the screen SCR.

  According to the light source device 1 of the present embodiment, the cooling medium 40 introduces the cooling medium obliquely with respect to the phosphor portion 30 toward the first unevenness formed on the surface of the phosphor portion 30. . For this reason, compared with the structure where the surface of a fluorescent substance part is flat, the thermal radiation area of the fluorescent substance part 30 can be enlarged. Further, the introduction of the cooling medium into the first unevenness makes it easy to generate turbulent flow, and the effect of diffusing the heat generated in the phosphor portion 30 can be enhanced. Further, since the cooling medium is introduced in an oblique direction with respect to the phosphor part 30, the cooling medium is guided to the entire phosphor part 30 as compared with the configuration in which the cooling medium is introduced perpendicular to the phosphor part. Thus, the cooling efficiency of the phosphor part 30 can be improved. Therefore, it is possible to provide the light source device 1 capable of suppressing the phosphor 32 from becoming high temperature and suppressing the decrease in the conversion efficiency to fluorescence.

  Moreover, according to this structure, since the base | substrate 51 is rotatable, the irradiation point with respect to the fluorescent substance part 30 (base | substrate 51) of the 1st light B inject | emitted by the light source unit 10 is not fixed to one point. Therefore, the heat generated in the phosphor portion 30 by the incidence of the first light B can be dissipated in a wide region along the circumferential direction. In addition, since the gas flows on the surface of the phosphor portion 30 as the base 51 rotates, the cooling efficiency of the phosphor portion 30 can be improved. Furthermore, a vortex is formed by the interaction between the flow of the gas on the surface of the phosphor portion 30 generated as the substrate 51 rotates and the flow of the cooling medium introduced in an oblique direction with respect to the phosphor portion 30. Turbulence tends to occur. Therefore, the effect of diffusing the heat generated in the phosphor part 30 can be enhanced.

  Further, according to this configuration, the cooling means 40 intersects the tangent line of the rotation locus at the portion P1 where the cooling medium is introduced that is located on the rotation locus of the portion P0 where the second light is emitted from the phosphor portion 30. Since the cooling medium is introduced in the direction opposite to the rotation direction of the base 51, the flow rate of the cooling medium flowing on the surface of the phosphor part 30 is increased. Therefore, the cooling efficiency of the phosphor part 30 can be improved.

  Further, according to this configuration, the cooling means 40 is parallel to the tangent line of the rotation locus at the portion P1 into which the cooling medium is introduced that is located on the rotation locus of the portion P0 where the second light is emitted from the phosphor portion 30. Since the cooling medium is introduced in a direction opposite to the rotation direction of the base 51, the flow velocity of the cooling medium flowing on the surface of the phosphor portion 30 can be maximized. Therefore, the cooling efficiency of the phosphor portion 30 can be reliably improved.

  Further, according to this configuration, since the cooling medium is a gas, compared to a configuration using a liquid as the cooling medium (for example, a configuration including cooling water, piping, and a pump), a simple configuration (for example, blowing a fan with a fan). Configuration). Therefore, the phosphor part 30 can be easily cooled at a low cost.

  Further, according to this configuration, since the first unevenness includes the plurality of recesses 33 formed at irregular positions, turbulence is likely to occur when the cooling medium is introduced into the first unevenness. Become. Therefore, the effect of diffusing the heat generated in the phosphor part 30 can be enhanced.

  Further, according to this configuration, since the first unevenness includes the plurality of recesses 33 formed in an irregular shape or an irregular size, the cooling medium is introduced into the first unevenness. Turbulence tends to occur. Therefore, the effect of diffusing the heat generated in the phosphor part 30 can be enhanced.

  According to the projector 1000 of the present embodiment, since the light source device 1 described above is provided, the projector 1000 that can suppress the phosphor 32 from becoming high temperature and suppress a decrease in conversion efficiency to fluorescence. Can be provided.

  In the light source device 1 of the present embodiment, the light source unit 10 that emits the blue light B and the light (yellow light) that is excited by a part of the blue light and includes red light and green light are directed to the collimating optical system 60. However, the present invention is not limited to this. For example, a light source that emits purple light or ultraviolet light, and a phosphor that is excited by the purple light or ultraviolet light emitted from the light source and emits light including red light, green light, and blue light toward the collimating optical system. It may be used.

  In the light source device 1 of the present embodiment, the phosphor portion 30 is formed on a part of the base 51, but the present invention is not limited to this. For example, the phosphor portion may be formed on the entire substrate.

  In the light source device 1 of the present embodiment, convex lenses are used as the first lens 21 and the second lens 22 in the condensing optical system 20, but the present invention is not limited to this. In short, it is sufficient that the condensing optical system enters the phosphor portion 30 in a state where the blue light is substantially parallelized as a whole. Further, the number of lenses constituting the condensing optical system may be one, or may be three or more.

  In the light source device 1 of the present embodiment, convex lenses are used as the first lens 61 and the second lens 62 in the collimating optical system 60, but the present invention is not limited to this. In short, it is sufficient that the collimating optical system is made to enter the illumination optical system in a state in which the light emitted from the phosphor portion is substantially parallelized. Further, the number of lenses constituting the collimating optical system may be one, or may be three or more.

  In the projector 1000 of this embodiment, three liquid crystal light modulation devices are used as the liquid crystal light modulation device, but the present invention is not limited to this. The present invention can also be applied to a projector using one, two, four or more liquid crystal light modulation devices.

  In the projector 1000 of the present embodiment, a transmissive projector is used, but the present invention is not limited to this. For example, a reflective projector may be used. Here, “transmission type” means that the light modulation device as the light modulation means is a type that transmits light, such as a transmission type liquid crystal display device. The “reflective type” means that a light modulation device as a light modulation unit, such as a reflection type liquid crystal display device, reflects light. Even when the present invention is applied to a reflective projector, the same effect as that of a transmissive projector can be obtained.

(Second Embodiment)
FIG. 7 is a schematic diagram showing an optical system of a projector 1001 according to the second embodiment of the invention corresponding to FIG. In FIG. 7, reference numeral 101ax denotes an illumination optical axis (optical axis of light emitted from the light source device 2 toward the color separation light guide optical system 201), and reference numeral 700ax denotes an illumination optical axis (color separation guide from the illumination apparatus 700). This is the optical axis of light emitted toward the optical optical system 201).
FIG. 8 is a perspective view showing the light source device 2 according to the second embodiment of the present invention, corresponding to FIG. In FIG. 2, symbol P2 is a portion where the second light is emitted from the phosphor portion 34, and symbol L2 is a tangent to the rotation locus at P2.

  As shown in FIGS. 7 and 8, the projector 1001 according to this embodiment includes a light source device 2 instead of the light source device 1 described above, a point further including an illumination device 700, and the color separation described above. The light source device 1 is different from the light source device 1 according to the first embodiment in that a color separation light guide optical system 201 is provided instead of the light guide optical system 200. That is, the projector 1001 according to the present embodiment is configured such that the light source device 2 emits light including red light and green light as illumination light, and the illumination device 700 emits blue light. Since the other points are the same as the above-described configuration, the same elements as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the projector 1001 includes a light source device 2, an illumination optical system 100, an illumination device 700, a color separation light guide optical system 201, and three liquid crystal light modulation devices 400R and 400G as light modulation devices. , 400B, a cross dichroic prism 500, and a projection optical system 600.

  The light source device 2 includes a light source unit 10, a collimating optical system 70, a dichroic mirror 80, a collimating condensing optical system 90, a base 52, a phosphor part 34, a motor 50, and a cooling means 41. Configured. In the light source device 2, the phosphor portion 34 is formed on a base 52 made of a metal that reflects visible light, and is configured to emit fluorescence toward a side on which blue light is incident. Accordingly, the light source device 2 according to the present embodiment has a different optical position of the light source unit 10 and includes a collimating optical system 70, a dichroic mirror 80, and a collimating condensing optical system 90, and the blue light from the light source unit 10. Is configured to enter the base 52 from the phosphor portion 34 side.

  The light source unit 10 is disposed so that the optical axis is orthogonal to the illumination optical axis 101ax. The light source unit 10 emits the first light B.

  The collimating optical system 70 is disposed in the optical path from the light source unit 10 to the dichroic mirror 80. The collimating optical system 70 includes a first lens 71 and a second lens 72. The first lens 71 and the second lens 72 are convex lenses. The collimating optical system 70 causes the blue light B to enter the dichroic mirror 80 in a substantially parallel state.

  The dichroic mirror 80 intersects each of the optical axis of the light source unit 10 and the illumination optical axis 101ax at an angle of 45 ° in the optical path from the collimating optical system 70 to the phosphor portion 34 (collimating condensing optical system 90). Are arranged as follows. The dichroic mirror 80 reflects blue light and transmits red light and green light.

  The collimator condensing optical system 90 includes a first lens 91 and a second lens 92. The first lens 91 and the second lens 92 are convex lenses. The collimating condensing optical system 90 causes the blue light from the dichroic mirror 80 to be incident on the phosphor part 34 in a substantially condensed state, and the illumination optical system in a state in which the fluorescence emitted from the phosphor part 34 is substantially parallelized. 100 is incident.

The base 52 is made of a material having a higher thermal conductivity than the phosphor portion 34. The base 52 is made of a metal such as aluminum (thermal conductivity: 236 W · m ⁻¹ · K ⁻¹ ) or copper (thermal conductivity: 398 W · m ⁻¹ · K ⁻¹ ). The base 52 dissipates heat accumulated in the phosphor portion 34 when the blue light B from the light source unit 10 enters the phosphor portion 34. In order to improve the heat dissipation performance of the base 52, the base 52 may be formed in a shape that increases the surface area, such as providing a plurality of protrusions on the back surface of the base 52.

The substrate 52 has a polished surface and a metallic luster, and has a large reflection coefficient for incident light. Further, the light-reflective material (SiO ₂ , NbO, TiO ₂ or the like) may be added as a thin film to the surface of the base 52 to constitute the enhanced reflection film.

  The phosphor part 34 is formed on the base 52. The phosphor part 34 is excited by the first light B emitted from the light source unit 10 and emits second light (yellow light) having a color different from that of the first light (blue light). The phosphor portion 34 is formed by dispersing particles of the phosphor 32 in a binder (fixing material) 35 made of a material that transmits blue light B such as silicone resin or glass. First irregularities are formed on the surface of the phosphor portion 34.

  The cooling means 41 is disposed on the motor 50 side of the base 52 and includes a pipe 42 that guides the cooling medium. The piping 42 has a proximal end connected to the cooling means 41 and a distal end routed around the phosphor portion 34. An opening 42 a is formed at the distal end of the pipe 42, and the phosphor portion 34 is inclined from the opening 42 a to the phosphor portion 34 (in a direction obliquely intersecting the direction orthogonal to the upper surface of the base 51). A cooling medium (in this case, a gas such as air) is introduced toward the first unevenness (recessed portion 36) formed on the surface of the substrate, and the phosphor portion 34 is cooled.

  Therefore, even when a component such as a lens (here, the collimator condensing optical system 90) is disposed above the base 52, the tip of the pipe 42 is disposed near the gap between the lens and the base 52. In addition, the cooling medium can be introduced obliquely with respect to the phosphor portion 34.

  The cooling means 41 (opening 42a) cools the portion P2 where the second light is emitted from the phosphor portion 34. In the portion P2 where the second light is radiated from the phosphor portion 34, the cooling means 41 directs the cooling medium in a direction (−Z direction) opposite to the tangential direction (+ Z direction) of the rotation direction of the base 52. Introduce. In addition, the tangent in the rotation direction of the base 52 is a tangent to the rotation locus in the portion P2 where the second light is emitted from the phosphor portion 34.

  FIG. 9 is a schematic diagram showing a phosphor portion 34 according to the second embodiment of the present invention. Fig.9 (a) is a front view of the fluorescent substance part 34, FIG.9 (b) is sectional drawing along the B1-B1 line | wire of Fig.9 (a).

  As shown in FIG. 9, the first uneven recess 36 has a line parallel to the direction in which the cooling means 41 introduces the cooling medium (in this case, introduced from the + Z direction toward the −Z direction) on the upper surface of the base 52. It is formed to have a length along the projected line. The concave portion 36 is formed such that the inclination 36a on the cooling medium introduction side becomes gentle in the longitudinal direction of the concave portion 36 and the inclination 36b on the cooling medium outlet side becomes steep.

  As shown in FIG. 7, the illumination device 700 includes a light source unit 710, a condensing optical system 720, a scattering plate 730, a polarization conversion integrator rod 740, and a condensing lens 750. .

  The light source unit 710 is a laser light source that emits blue light (emission intensity peak: about 445 nm) made of laser light as color light.

  The condensing optical system 720 includes a first lens 721 and a second lens 722. The first lens 721 and the second lens 722 are convex lenses. The condensing optical system 720 causes the blue light B to be incident on the scattering plate 730 in a substantially condensed state.

  The scattering plate 730 scatters the blue light from the light source unit 710 with a predetermined scattering degree to obtain blue light having a light distribution similar to fluorescence. As the scattering plate 730, for example, polished glass made of optical glass can be used.

  The polarization conversion integrator rod 740 makes the in-plane intensity distribution of the blue light from the light source unit 710 uniform, and makes the polarization direction of the blue light approximately one type of linearly polarized light having the same polarization direction. The polarization conversion integrator rod 740 includes, for example, an integrator rod, a reflecting plate that is disposed on the incident surface side of the integrator rod, has a small hole through which blue light is incident, a reflective polarizing plate that is disposed on the exit surface side, It comprises.

  The condensing lens 750 condenses the light from the polarization conversion integrator rod 740 and causes it to enter the vicinity of the image forming area of the liquid crystal light modulator 400B.

  The color separation light guide optical system 201 includes a dichroic mirror 210 and reflection mirrors 222, 230, and 250. The color separation light guide optical system 201 separates light from the light source device 2 (illumination optical system 100) into red light and green light, and red light and green light from the light source device 2 and blue light from the illumination device 700. Each color light is guided to the liquid crystal light modulation devices 400R, 400G, and 400B to be illuminated.

  The red light transmitted through the dichroic mirror 210 is reflected by the reflection mirror 230, passes through the condenser lens 300R, and enters the image forming area of the liquid crystal light modulation device 400R for red light.

  The green light reflected by the dichroic mirror 210 is further reflected by the reflection mirror 222, passes through the condenser lens 300G, and enters the image forming area of the liquid crystal light modulation device 400G for green light.

  The blue light from the illumination device 700 is reflected by the reflection mirror 250, passes through the condenser lens 300B, and enters the image forming region of the blue light liquid crystal light modulation device 400B.

  According to the light source device 2 of the present embodiment, since the cooling unit 41 cools the portion where the second light is emitted from the phosphor portion 34, the portion that generates heat in the phosphor portion 34 is cooled directly. Therefore, the cooling efficiency of the phosphor part 34 can be improved.

  Further, according to this configuration, the cooling medium introduced by the cooling means 41 is accelerated by the gentle inclination 36a of the concave portion 36, and the accelerated cooling medium collides with the steep inclination 36b of the concave portion 36. A vortex is formed, resulting in strong turbulence. Therefore, the effect of diffusing the heat generated in the phosphor part 34 can be enhanced.

  Further, according to this configuration, since the base 52 is formed of a material having a higher thermal conductivity than the phosphor portion 34, the heat generated in the phosphor portion 34 conducts the base 52. The conducted heat is released from the surface of the substrate 52. Therefore, the cooling efficiency of the phosphor part 34 can be improved.

  In the light source device 2 of this embodiment, the example in which the base 52 is formed of a metal having high thermal conductivity has been described. However, the present invention is not limited to this. For example, a transmissive disc made of a material that transmits blue light may be used as in the first embodiment. In this case, the phosphor portion is formed on the base via a reflective film that reflects blue light (visible light).

(Third embodiment)
FIG. 10 is a schematic diagram showing an optical system of a projector 1002 according to the third embodiment of the invention corresponding to FIG. In FIG. 10, reference numeral 102ax denotes an illumination optical axis (optical axis of light emitted from the light source device 3 toward the color separation light guide optical system 201), and reference numeral 700ax denotes an illumination optical axis (color separation guide from the illumination apparatus 700). This is the optical axis of light emitted toward the optical optical system 201).
FIG. 11 is a perspective view showing a light source device 3 according to the third embodiment of the present invention, corresponding to FIG.

  As shown in FIGS. 10 and 11, the projector 1002 according to this embodiment is different from the light source device 2 according to the second embodiment described above in that it includes a light source device 3 instead of the light source device 2 described above. Yes. That is, the projector 1002 according to this embodiment has a configuration in which the light source device 3 includes a fixed base 53 instead of the motor and the rotating disk. Since the other points are the same as the above-described configuration, the same elements as those in FIGS. 7 and 8 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 10, the projector 1002 includes a light source device 3, an illumination optical system 100, an illumination device 700, a color separation light guide optical system 201, and three liquid crystal light modulation devices 400R and 400G as light modulation devices. , 400B, a cross dichroic prism 500, and a projection optical system 600.

  The light source device 3 includes a light source unit 10, a collimating optical system 70, a dichroic mirror 80, a collimating condensing optical system 90, a base 53, a heat radiation fin 55, a phosphor unit 37, and a cooling unit 43. It is comprised. The light source unit 10 is disposed so that the optical axis is orthogonal to the illumination optical axis 102ax.

The base 53 is made of a metal having a high thermal conductivity such as aluminum (thermal conductivity: 236 W · m ⁻¹ · K ⁻¹ ) or copper (thermal conductivity: 398 W · m ⁻¹ · K ⁻¹ ). Yes. Further, the base 53 is made of a material having a higher emissivity than the phosphor portion 37. For example, the emissivity of the base 53 can be increased by blackening the surface of the base 53. As the blackening treatment, for example, a treatment for treating the surface of the base 53 with black alumite or a treatment for applying carbon black as a black pigment can be used.

  Second unevenness is formed on the surface of the base 53 on which the phosphor portion 37 is formed. The 2nd unevenness | corrugation contains the several recessed part 54 formed in the irregular position. The second unevenness includes a plurality of recesses 54 formed with an irregular shape or irregular size.

  Radiating fins 55 are provided on the back surface of the base 53. The radiating fins 55 are formed of a metal having high thermal conductivity, like the base 53. Thereby, the base 53 is structured to have a large surface area. In addition, the cooling type by thermoelectric conversion elements, such as a Peltier element, can also be implemented.

  The phosphor part 37 is formed on the base 53. The phosphor portion 37 is excited by the first light B emitted from the light source unit 10 and emits second light (yellow light) having a color different from that of the first light (blue light). On the surface of the phosphor portion 37, first irregularities (concave portions 38) are formed.

  The phosphor part 37 is formed in the central part of the base 53. For this reason, the heat generated from the phosphor portion 37 is easily spread to the base 53 as compared with the configuration in which the phosphor portion is formed at the end of the base.

  The cooling means 43 is a so-called air cooling fan. The cooling means 43 has first irregularities (concave portions 38) formed on the surface of the phosphor portion 37 in an oblique direction with respect to the phosphor portion 37 (a direction obliquely intersecting with a direction orthogonal to the upper surface of the base 53). A cooling medium (in this case, a gas such as air) is introduced to cool the first unevenness (recess 38).

  According to the light source device 3 of the present embodiment, since the base 53 is made of a material having a higher emissivity than the phosphor portion 37, the cooling efficiency of the phosphor portion 37 can be improved by a heat dissipation method using radiation. Can do.

  In addition, according to this configuration, since the second unevenness is formed on the surface of the base 53 on which the phosphor portion 37 is formed, the heat conducted from the phosphor portion 37 to the base 53 is transmitted to the base 53. It is transmitted to the outside from the second unevenness. For this reason, compared with the structure where the surface of a base | substrate is flat, the thermal radiation area of the conducted heat can be enlarged. Moreover, a turbulent flow is easily generated by introducing the cooling medium into the second unevenness, and the effect of diffusing the conducted heat can be enhanced. Therefore, the cooling efficiency of the phosphor part 37 can be improved.

(Fourth embodiment)
FIG. 12 is a schematic diagram showing an optical system of a projector 1003 according to the fourth embodiment of the invention corresponding to FIG. In FIG. 12, reference numeral 103ax denotes an illumination optical axis (an optical axis of light emitted from the light source device 4 toward the color separation light guide optical system 201), and reference numeral 700ax denotes an illumination optical axis (a color separation guide from the illumination apparatus 700). This is the optical axis of light emitted toward the optical optical system 201).
FIG. 13 is a perspective view showing a light source device 4 according to the fourth embodiment of the present invention, corresponding to FIG.

  As shown in FIGS. 12 and 13, the projector 1003 according to the present embodiment is different from the light source device 3 according to the third embodiment described above in that a light source device 4 is provided instead of the light source device 3 described above. Yes. That is, the projector 1003 according to this embodiment has a configuration in which the cooling medium of the cooling unit 44 of the light source device 4 is a liquid. Since the other points are the same as the above-described configuration, the same elements as those in FIGS. 10 and 11 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 12, the projector 1003 includes a light source device 4, an illumination optical system 100, an illumination device 700, a color separation light guide optical system 201, and three liquid crystal light modulation devices 400R and 400G as light modulation devices. , 400B, a cross dichroic prism 500, and a projection optical system 600.

  The light source device 4 includes a light source unit 10, a collimating optical system 70, a dichroic mirror 80, a collimating condensing optical system 90, a base 56, a radiation fin 55, a phosphor part 37, and a cooling unit 44. It is comprised. The light source unit 10 is disposed so that the optical axis is orthogonal to the illumination optical axis 103ax.

The substrate 56 is made of a metal having high thermal conductivity such as aluminum (thermal conductivity: 236 W · m ⁻¹ · K ⁻¹ ) or copper (thermal conductivity: 398 W · m ⁻¹ · K ⁻¹ ). Yes. The emissivity of the substrate 56 is increased by blackening the surface of the substrate 56.

  A groove 57 is formed in the upper portion of the base body 56. The groove 57 is formed to have a length in the direction (X-axis direction) in which the cooling means 44 introduces a cooling medium (here, a liquid such as cooling water). The groove 57 has, in the longitudinal direction of the groove 57, an inclined surface 57a inclined obliquely in the cooling medium inflow direction (+ X direction) on the cooling medium introduction side and a flat surface 57b on the cooling medium introduction side. Is formed. As a result, the cooling medium is introduced from the cooling means 44 to the phosphor portion 37 in an oblique direction.

  Radiating fins 55 are provided on the back surface of the substrate 56. The radiating fins 55 are formed of a metal having high thermal conductivity, like the base 53. Thereby, the base 53 is structured to have a large surface area. In addition, the cooling type by thermoelectric conversion elements, such as a Peltier element, can also be implemented.

  The phosphor part 37 is formed on the base 53. The phosphor portion 37 is excited by the first light B emitted from the light source unit 10 and emits second light (yellow light) having a color different from that of the first light (blue light). On the surface of the phosphor portion 37, first irregularities (concave portions 38) are formed. The phosphor part 37 is formed in the central part of the base 53.

  The cooling means 44 is disposed on the side of the heat dissipation fin 55 of the base body 56 and includes a pipe 45 that guides the cooling medium. The piping 45 has a proximal end connected to the cooling means 44 and a distal end connected to both side ends of the base body 56. An opening 45 a is formed at the tip of the pipe 45, and is formed on the surface of the phosphor part 34 in an oblique direction with respect to the phosphor part 34 from the opening 45 a via the slope 57 a of the groove 57. A cooling medium (here, a liquid such as cooling water) is introduced toward the first unevenness to cool the first unevenness.

  In addition, the opening part of the groove | channel 57 in the upper part of the base | substrate 56 and both sides of the base | substrate 56 is covered with the sealing member 58, and a cooling medium does not leak outside.

  According to the light source device 3 of the present embodiment, since the cooling medium is a liquid, the temperature change of the cooling medium is smaller than in the configuration using gas as the cooling medium. Therefore, the phosphor part 37 can be cooled stably and efficiently.

(Modification 1)
FIG. 14 is a view showing a modification of the phosphor part according to the present invention. Fig.14 (a) is a schematic diagram which shows the 1st modification of the fluorescent substance part which concerns on this invention.

  As shown in FIG. 14A, first irregularities (concave portions 33A) are irregularly formed on the surface of the phosphor portion 32A of the present modification. Specifically, the 1st unevenness | corrugation contains the some recessed part 33A formed in the irregular shape and irregular shape.

(Modification 2)
FIG. 14B is a schematic diagram showing a second modification of the phosphor portion according to the present invention.
As shown in FIG. 14B, first irregularities (concave portions 33B) are formed in a sawtooth shape on the surface of the phosphor portion 32B of the present modification. Specifically, the 1st unevenness | corrugation contains the several recessed part 33B formed in V shape.

(Modification 3)
FIG.14 (c) is a schematic diagram which shows the 3rd modification of the fluorescent substance part which concerns on this invention.
As shown in FIG. 14C, first irregularities (concave portions 33C) are formed in a rectangular wave shape on the surface of the phosphor portion 32C of the present modification. Specifically, the 1st unevenness | corrugation contains the some recessed part 33C formed in the rectangular shape.

  According to this modification, the fluorescence emitted from the phosphor portion can be substantially parallelized by the first unevenness (the plurality of recesses 33C). Therefore, it is possible to achieve both cooling of the phosphor portion and light extraction efficiency.

  The present invention is applicable not only when applied to a front projection type projector that projects from the side that observes the projected image, but also when applied to a rear projection type projector that projects from the side opposite to the side that observes the projected image. can do.

  In each of the above embodiments, the example in which the light source device of the present invention is applied to a projector has been described, but the present invention is not limited to this. For example, the light source device of the present invention can be applied to other optical devices (for example, an optical disc device, a car headlamp, a lighting device, etc.).

1, 2, 3, 4 ... Light source device, 10 ... Light source unit (light source), 30, 34, 37 ... Phosphor part, 33, 36, 38 ... First concave / convex concave part, 36a ... Introduction side inclination, 36b ... Inclination on the lead-out side, 40, 41, 43, 44 ... Cooling means, 51, 52, 53, 56 ... Base, 400R, 400G, 400B ... Liquid crystal light modulator (light modulator), 600 ... Projection optical system, 1000 , 1001, 1002, 1003... Projector, P0, P2... Part where the second light is emitted from the phosphor part, P1... Cooling located on the rotation locus of the part where the second light is emitted from the phosphor part. The part where the medium is introduced, L1, L2,.

Claims (14)

A substrate;
A light source that emits first light;
A first unevenness is formed on the surface, which is arranged on the substrate and is excited by the first light emitted from the light source and emits second light having a color different from that of the first light. Phosphor part,
A cooling means for cooling the phosphor portion by introducing a cooling medium in an oblique direction with respect to the phosphor portion toward the first unevenness;
A light source device comprising:   The light source device according to claim 1, wherein the cooling unit cools a portion where the second light is emitted from the phosphor portion.   The light source device according to claim 1, wherein the base body is rotatable about a rotation axis parallel to a direction orthogonal to the upper surface of the base body.   The cooling means is a direction intersecting a tangent line of the rotation locus at a portion where the cooling medium is introduced that is located on a rotation locus of the portion where the second light is emitted from the phosphor portion, and The light source device according to claim 3, wherein the cooling medium is introduced in a direction opposite to a rotation direction of the base.   The cooling means is in a direction parallel to a tangent to the rotation locus in a portion where the cooling medium is introduced that is located on a rotation locus of a portion where the second light is emitted from the phosphor portion. The light source device according to claim 3, wherein the cooling medium is introduced in a direction opposite to a rotation direction of the base.   The light source device according to claim 1, wherein the cooling medium is a gas.   The light source device according to claim 1, wherein the cooling medium is a liquid.   The light source device according to any one of claims 1 to 7, wherein the first unevenness includes a plurality of concave portions formed at irregular positions.   The light source device according to claim 1, wherein the first unevenness includes a plurality of concave portions formed in an irregular shape or an irregular size. The concave portion of the first concavo-convex is formed to have a length along a line projected on the upper surface of the substrate parallel to a direction in which the cooling means introduces the cooling medium, and
10. The concave portion is formed so that an inclination on the introduction side of the cooling medium becomes gentle and an inclination on the outlet side of the cooling medium becomes steep in the longitudinal direction of the concave portion. The light source device according to any one of the above.   The light source device according to claim 1, wherein the base is made of a material having a greater emissivity than the phosphor portion.   The light source device according to claim 1, wherein the base is made of a material having a higher thermal conductivity than the phosphor portion.   13. The light source device according to claim 12, wherein second unevenness is formed on a surface of the base on which the phosphor portion is formed. The light source device according to any one of claims 1 to 13,
A light modulation device that modulates the second light emitted from the light source device according to image information;
A projection optical system that projects modulated light from the light modulation device as a projection image;
A projector comprising:

Images