JP7113318B2 - Light source device and projection type image display device - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a light source device and a projection display device including the same.

A high-intensity high-pressure mercury lamp is used as a light source for a conventional projection-type image display device. These high-pressure mercury lamps cannot be turned on instantaneously and have a short light source life, so maintenance may be complicated. For this reason, it has been proposed to use, for example, solid-state light-emitting devices such as semiconductor lasers and light-emitting diodes as light sources for projection display devices.

For example, the light source device proposed in Patent Document 1 includes a blue laser light source (semiconductor laser) that also serves as an excitation light source, a phosphor wheel that applies a plurality of segmented phosphors to a rotating base material, and a color wheel. Prepare. The fluorescence emitted from the phosphor wheel is trimmed into desired color light by the color wheel and then emitted in a time division manner.

On the other hand, in the light source system that excites these phosphors, it is necessary to dissipate the heat generated during the fluorescence emission process from the phosphors. For this reason, for example, in the light source device proposed in Patent Literature 2, a cooling structure is provided in the casing that houses the phosphor, thereby cooling the atmosphere inside the casing and cooling the temperature of the phosphor.

JP 2014-160227 A JP 2014-146056 A

The present disclosure provides a light source device capable of appropriately cooling a phosphor wheel hermetically housed in a storage container, and a projection image display device including the light source device.

A light source device according to the present disclosure includes an excitation light source, a fluorescent plate that emits fluorescent light with excitation light from the excitation light source, and a storage container that houses the fluorescent plate. The containment vessel has a heat-receiving layer at a position facing the fluorescence emission surface of the fluorescent plate on the inner surface thereof. The containment vessel has a heat dissipation layer on its exterior. The heat-receiving layer and the heat-dissipating layer are thermally connected and are made of the same material.

The light source device of the present disclosure can appropriately cool the phosphor wheel hermetically housed in the container.

1 is a configuration diagram of a projection display apparatus according to Embodiment 1 of the present disclosure; Configuration diagram of phosphor wheel according to Embodiment 1 of the present disclosure Configuration diagram of a color filter wheel according to the first embodiment of the present disclosure A diagram showing an example spectrum of a color filter A configuration diagram of a light source device according to a first embodiment of the present disclosure Diagram showing the area of the heat receiving part in the wall Schematic diagram for explaining energy transfer in the light source device of the present disclosure Configuration diagram showing another configuration of the light source device according to the first embodiment of the present disclosure The figure which shows another structure of a cooling part Configuration diagram of a projection display apparatus according to a second embodiment of the present disclosure Configuration diagram of a fluorescent plate according to the second embodiment of the present disclosure Configuration diagram of a light source device according to a second embodiment of the present disclosure Configuration diagram of a projection display apparatus according to a third embodiment of the present disclosure

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art. It should be noted that the accompanying drawings and the following description are provided for a thorough understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter.

Further, hereinafter, in the description of the drawings of the light source device and the projection display device according to the embodiments of the present disclosure, the same or similar parts are given the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the ratio of each dimension is different from the actual one. Therefore, specific dimensions should be determined with reference to the following description. In addition, it goes without saying that there are portions with different dimensional relationships and ratios between the drawings.

In the following embodiments, a projection image display device will be described as an example of a device including a light source device according to the present disclosure. However, the device using the light source device of the present disclosure is not limited to this, and may be, for example, a video display device such as a television, or a lighting device such as a headlamp.

[Embodiment 1]
A projection-type image display apparatus according to the first embodiment will be described below with reference to the drawings.

(Overview of Projection Display Device 100)
FIG. 1 is a diagram showing an optical configuration of a projection display apparatus 100 according to Embodiment 1. FIG.

A projection-type image display device 100 includes a light source device 10 , an illumination device 11 , an image display section 12 , and a projection system 13 . The light source device 10 emits reference light. The illumination device 11 homogenizes the light from the light source device 10 and emits illumination light. The video display unit 12 modulates the illumination light from the illumination device 11 with a video signal and emits the video light. The projection system 13 magnifies and projects the image light from the image display unit 12 onto a screen. A projection-type image display apparatus 100 of the present embodiment is a projection-type image display apparatus equipped with one spatial modulation element 41 (for example, a DMD (Digital Mirror Device)) that modulates illumination light according to an image signal. .

(Configuration of light source device 10)
The light source device 10 has a light source 20 . The light source 20 is composed of a semiconductor laser 21 as a laser light source and a collimator lens 22 . Here, the semiconductor laser 21 is an example of a solid-state light source.

The semiconductor laser 21 emits blue laser light (for example, wavelength 455 nm) which has the highest luminous efficiency among the three primary colors of RGB. The semiconductor laser 21 is configured as an array light source 23 in which a plurality of semiconductor lasers 21 are arranged in a matrix in order to obtain high-output reference light. Although not shown, a heat sink for forced air cooling is provided on the rear side of the array light source 23 . A collimator lens 22 arranged on the emission side of each semiconductor laser 21 converges the emitted light of the semiconductor laser 21 into substantially parallel light.

Blue laser light emitted from the light source 20 is superimposed while being condensed by the condensing lens 30 . The superimposed laser light is transmitted through the diffuser plate 60 and applied as excitation light to the phosphor 73 on the phosphor wheel 70 . The diffuser plate 60 has a function of reducing coherence of light from the light source 20 . Details of the phosphor wheel 70 will be described later.

From the phosphor wheel 70, a laser beam passing through the transparent substrate 71 and fluorescence emitted by the phosphor 73 irradiated with the laser beam are obtained.

That is, the blue laser light emitted from the light source 20 is excitation light E (see FIG. 7) that generates a blue image of video light and causes the phosphor wheel 70 to cause the phosphor 73 to emit fluorescence. Then, the phosphor 73 emits fluorescence F (see FIG. 7) having a wavelength band different from that of the excitation light E by the excitation light E incident from the light source 20 .

The excitation light E and fluorescence F emitted from the phosphor wheel 70 are collimated by a collimator lens group composed of lenses 31 and 32 , and then irradiated onto the color filter wheel 80 by the lens 33 . Details of the color filter wheel 80 will be described later.

The excitation light E and the fluorescence F trimmed to desired color light by the color filter wheel 80 are emitted from the color filter wheel 80 and then enter the rod integrator 34 .

(Configuration of Phosphor Wheel 70)
The configuration of phosphor wheel 70 will be described with reference to FIG. FIG. 2(a) is a side cross-sectional view of the phosphor wheel 70 viewed from the +y direction in FIG. FIG. 2(b) is a front view of the phosphor wheel 70 viewed from the left side of FIG. 2(a) (-z direction in FIG. 1). The phosphor wheel 70 is composed of a transparent substrate 71, a ring-shaped phosphor 73 formed on the transparent substrate 71, and a motor 74, as shown in FIG. 2(a). A motor 74 rotates the disk-shaped transparent substrate 71 .

The transparent substrate 71 is attached via a driving portion 74a and an attaching portion 74b of a motor 74, and is rotated under the control of a control portion (not shown). The mounting portion 74b is, for example, configured to hold the transparent substrate 71 between a hub and a holding member and fix it with screws.

The transparent substrate 71 is a disk-shaped transparent substrate, and is composed of, for example, a sapphire substrate having high thermal conductivity. Further, the light incident surface (non-phosphor forming surface) of the transparent substrate 71 has an antireflection film 72a. The light emitting surface (phosphor forming surface) is provided with a dichroic film 72b that transmits blue light, which is the excitation light E, and reflects light in a wavelength region different from that of the excitation light. The dichroic film 72 b is an example of a reflective film on the phosphor wheel 70 . Also, on the surface of the dichroic film 72b of the transparent substrate 71, as shown in FIG.

The first phosphor region 73 a is an arc-shaped range that is a partial ring-shaped region centered on the rotation axis of the transparent substrate 71 with respect to the transparent substrate 71 . The first phosphor region 73a is coated with a phosphor that emits yellow light with a dominant wavelength of about 570 nm when excited by blue light with a wavelength of about 455 nm.

The second phosphor region 73 b is an arc-shaped range that is a partial ring-shaped region centered on the rotation axis of the transparent substrate 71 with respect to the transparent substrate 71 . The second phosphor region 73b is coated with a phosphor that emits green light with a dominant wavelength of about 550 nm when excited by blue light with a wavelength of about 455 nm.

A yellow phosphor Py is applied to the surface of the dichroic film 72b of the transparent substrate 71 via a transparent binder B in the first phosphor region 73a. A green phosphor Pg is applied to the surface of the dichroic film 72b of the transparent substrate 71 via a transparent binder B in the second phosphor region 73b.

Y ₃ Al ₅ O ₁₂ :Ce ₃ ⁺ is used as the yellow phosphor Py, for example. As the green phosphor Pg, for example, Lu ₃ Al ₅ O ₁₂ :Ce ₃ ⁺ is used. As the transparent binder B, silicone resin is used, for example.

The transmissive region 75 is a region where no phosphor is applied, and the excitation light E to be irradiated is transmitted without changing the wavelength. Regarding the configuration of the transmissive region 75, the transmissive region 75 is composed of only the dichroic film 72b, or the surface of the dichroic film 72b is coated with a transparent binder B, or the antireflection film 72a is deposited instead of the dichroic film 72b. It is desirable that the

Blue light, which is the excitation light E, enters the phosphor wheel 70 from the right side (+z direction) in FIG. The blue light incident on the transparent substrate 71 passes through the dichroic film 72b and illuminates the first phosphor region 73a, the second phosphor region 73b, and the transmissive region 75. As shown in FIG.

Here, the phosphor wheel 70 is arranged such that the above-described three regions, the first phosphor region 73a, the second phosphor region 73b, and the transmissive region 75, rotate once per frame (for example, 1/60 second). It is configured.

That is, the light irradiated to the phosphor wheel 70 is divided into a first phosphor region 73a (first segment), a second phosphor region 73b (second segment), and a transmissive region 75 (second segment) for a time corresponding to one frame. 3 segments) in order to irradiate the first to third segments. In other words, the rotation speed of the motor 74 is controlled so that the phosphor wheel 70 rotates once in the time corresponding to one frame.

The excitation light E incident on the first phosphor region 73a excites the phosphor Py to isotropically emit yellow fluorescence Fy. The excitation light E incident on the second phosphor region 73b excites the phosphor Pg to emit green fluorescence Fg isotropically. Of the yellow fluorescence Fy and the green fluorescence Fg that emit excitation light, the component emitted in the direction opposite to the traveling direction of the excitation light E is reflected by the dichroic film 72b, and together with the component emitted in the traveling direction of the excitation light E, the excitation It is emitted in the traveling direction of the light E. The excitation light E incident on the transmissive region 75 is transmitted through the transmissive region 75 as it is.

That is, the excitation light E applied to the first and second segments of the phosphor wheel 70 is converted into yellow fluorescence Fy and green fluorescence Fg. The excitation light E irradiated to the third segment is emitted through the phosphor wheel 70 as it is, as shown in FIG. Wheel 80 is irradiated.

Here, the transparent substrate 71 provided with the phosphor 73 that is excited by the excitation light E and emits fluorescent light in the traveling direction of the excitation light E is an example of a transmissive fluorescent plate.

(Configuration of color filter wheel 80)
The configuration of the color filter wheel 80 will be described with reference to FIG. FIG. 3(a) is a side sectional view of the color filter wheel 80 viewed from the +y direction in FIG. FIG. 3(b) is a front view of the color filter wheel 80 viewed from the right side (+z direction) of FIG. 3(a).

The color filter wheel 80 comprises a transparent substrate 81 and a motor 84, as shown in FIG. 3(a). A motor 84 rotates the disk-shaped transparent substrate 81 .

The transparent substrate 81 is attached to a motor 84 via a driving portion 84a and an attaching portion 84b, and is rotated under the control of a control portion (not shown). The attachment portion 84b is, for example, configured to bond the transparent substrate 81 with a hub.

The transparent substrate 81 is a disk-shaped transparent substrate, and is composed of, for example, a glass substrate that is highly transmissive over the entire visible range.

The light incident surface of the transparent substrate 81 is provided with color filters 82a, 82b, and 82c formed by applying a dichroic film 82 thereon. An antireflection film 83 is provided on the light exit surface of the transparent substrate 81 . The dichroic film 82 reflects part of the wavelength band of incident light and transmits light in a desired wavelength range to achieve desired color light. The dichroic film 82 is an example of a reflective film in a color filter.

The color filter wheel 80 has four segments as shown in FIG. 3(b). As shown in the spectrum diagram of FIG. 4A, the color filter 82a, which is the first segment, and the color filter 82c, which is the third segment, have high transmission in the visible wavelength region longer than 480 nm, and It is composed of a color filter (dichroic film) having high reflection characteristics in the short visible wavelength range of 480 nm or less. Therefore, for excitation light with a wavelength of about 455 nm, it has a high reflection characteristic as shown in FIG. 4(a).

Further, as shown in the spectrum diagram of FIG. 4B, the color filter 82b, which is the second segment, has high transmission in the visible wavelength region longer than 600 nm and short visible wavelength region of 600 nm or less. is composed of a highly reflective color filter (dichroic film). This color filter 82b is also highly reflective for excitation light with a wavelength of about 455 nm, as shown in FIG. 4(b).

That is, the color filters 82a, 82b, and 82c perform trimming by reflecting and cutting a part of the wavelength band of incident light and transmitting light in a desired wavelength region for realizing desired color light.

The light diffusing region 85, which is the fourth segment, has a light diffusing function of diffusing incident light, and is, for example, a diffuser plate composed of a large number of minute lens arrays on the surface of the transparent substrate 81. FIG. Each segment is formed in a fan shape around the rotation axis of the transparent substrate 81 . The color filter wheel 80 has a configuration in which a plurality of types of color filters and a diffusion surface are locally formed on a single transparent substrate, or various fan-shaped filters and a diffusion plate are arranged side by side and fixed. It is an integrated configuration.

Here, the phosphor wheel 70 and the color filter wheel 80 are controlled to rotate synchronously at the same number of rotations. That is, the color filter wheel 80 is controlled such that the four segments described above rotate once in a time corresponding to one frame (eg, 1/60 second).

Here, the color filters 82a, 82b, and 82c are an example of color filter plates that cut part of the wavelength region of the light from the phosphor wheel 70 and trim the light to a desired color.

(Timing of phosphor wheel 70 and color filter wheel 80)
The rotation of the yellow fluorescence Fy emitted from the first phosphor region 73a on the phosphor wheel 70 is controlled so as to enter the color filters 82a and 82b on the color filter wheel 80. FIG. Therefore, the angle of the first phosphor region 73a and the sum of the angles of the color filters 82a and 82b are set to be the same.

When the yellow fluorescence Fy emitted from the first phosphor region 73a is transmitted through the color filter 82a, the color filter 82a reflects visible light with a short wavelength of 480 nm or less and transmits visible light with a wavelength longer than 480 nm. to generate the yellow reference light Ly. When the yellow fluorescence Fy emitted from the first phosphor region 73a is transmitted through the color filter 82b, the color filter 82b reflects visible light with a short wavelength of 600 nm or less and transmits visible light with a wavelength longer than 600 nm. to generate the red reference light Lr.

The rotation of the green fluorescence Fg emitted from the second phosphor region 73b of the phosphor wheel 70 is controlled so as to enter the color filter 82c of the color filter wheel 80. FIG. Therefore, the angle of the second phosphor region 73b and the angle of the color filter 82c are set to be the same. When the green fluorescence Fg emitted from the second phosphor region 73b is transmitted through the color filter 82c, the color filter 82c reflects visible light with a short wavelength of 480 nm or less and transmits visible light with a wavelength longer than 480 nm. to generate green reference light Lg.

The rotation of the excitation light E transmitted through the transmissive regions 75 of the phosphor wheel 70 is controlled so as to enter the light diffusion regions 85 of the color filter wheel 80 . Therefore, the angle of the transmission area 75 and the angle of the light diffusion area 85 are set to be the same. The excitation light E transmitted through the light diffusion region 85 is diffused by the light diffusion region 85 to generate blue reference light Lb.

(Configuration of illumination device 11)
As shown in FIG. 1, the illumination device 11 includes a lens 33, a color filter wheel 80, a rod integrator 34, lenses 35, 36, and 37. As shown in FIG. The light emitted from the rod integrator 34 is relayed by the lens 35 , the lens 36 and the lens 37 , becomes emitted light from the illumination device 11 , and enters the image display section 12 .

(Configuration of image display unit 12 and projection system 13)
The image display unit 12 is a device that receives light emitted from the illumination device 11 and generates an image. As shown in FIG. 1, the image display unit 12 is composed of a total reflection prism 42 and one DMD 41 as a spatial modulation element.

The total reflection prism 42 has a surface 42 a that totally reflects light, and guides the light incident from the illumination device 11 to the DMD 41 . The DMD 41 has a plurality of movable micromirrors, and is controlled by a control unit (not shown) in accordance with the timing of each color reference light incident thereon and according to an input video signal. is modulated by the video signal. The light modulated by DMD 41 is transmitted through total reflection prism 42 and guided to projection lens 50 (see FIG. 1). Here, the projection lens 50 is an example of a projection optical system.

The projection system 13 is composed of a projection lens 50 and a screen (not shown), and the projection lens 50 projects temporally synthesized image light onto the screen.

(Configuration of containment vessel 90)
The configuration of the container 90 for the phosphor wheel 70 will be described with reference to FIG. The storage container 90 is a closed storage container that houses at least the phosphor wheel 70 of the light source device 10 . The containment vessel 90 is composed of wall portions 90A, 90B, 90C, 90D, 90E (ceiling surface) and 90F (bottom surface). In this embodiment, the light source 20 , the condenser lens 30 , the diffusion plate 60 and the lens 31 are housed in the container 90 together with the phosphor wheel 70 . As a material for forming the containment vessel 90, aluminum or copper having excellent thermal conductivity is used.

The light source 20 also serves as a boundary between the inside and the outside on the wall portion 90A of the container 90, and has a heat sink (not shown) for forced air cooling on the outside of the wall portion 90A.

It should be noted that the lens 31 is a light path that serves as a boundary between the inside and the outside of the wall portion 90</b>C of the container 90 . A light incident surface is provided inside the wall portion 90C, and a light exit surface is provided outside.

Here, the wall portion 90</b>C of the container 90 is a wall surface facing the fluorescence emission surface of the phosphor 73 . A heat receiving portion 91A that transfers heat generated by the phosphor 73 to the storage container 90 is provided on the inner surface of the wall portion 90C. As indicated by the dashed line in FIG. 5, the heat receiving portion 91A is a heat-absorbing paint layer in which a heat-absorbing paint that absorbs the heat of the phosphor 73 is applied to the inner surface of the wall portion 90C. As indicated by the two-dot chain line in FIG. 5, the outer surface of the wall portion 90C is provided with a heat radiating portion 91B that radiates the heat absorbed by the heat receiving portion 91A to the outside of the containment vessel 90. As shown in FIG. The heat radiating portion 91B is, for example, a heat radiating paint layer coated with a heat radiating paint that is the same resin composition as the heat absorbing paint applied to the surface of the heat receiving portion 91A. The cooling portion 91 is composed of a heat receiving portion 91A and a heat radiating portion 91B. The heat receiving portion 91A and the heat radiating portion 91B are thermally connected.

The heat receiving portion 91A that receives heat generated by the phosphor 73 is arranged close to the phosphor 73 of the phosphor wheel 70 in order to enhance the heat receiving effect.

A region of the heat receiving portion 91A in the wall portion 90C will be described with reference to FIG. FIG. 6 is a perspective view of the wall portion 90C viewed from the light emitting surface side of the transparent substrate 71. FIG. The wall portion 90C is provided with a hole for inserting the lens 31 through which light passes. The phosphor wheel 70 is arranged substantially in the center with respect to the wall portion 90C.

The heat receiving portion 91A is provided on the inner surface of the wall portion 90C and at least in front of the facing phosphor 73 . For example, as shown in the heat-absorbing paint application area (gray shaded area) in FIG. It is an endothermic paint layer formed by being applied.
Note that the heat receiving portion 91A may be formed by applying a heat absorbing paint to the entire surface of the wall portion 90C without being limited to the ring shape shown in FIG. Also, the heat receiving portion 91A may be a layer obtained by plating or alumite processing the surface of the wall portion 90C.

Further, as another example of the heat radiating portion 91B that radiates the heat received by the heat receiving portion 91A, heat radiating fins integrally formed on the wall portion 90C may be used.

The outside of the wall portion 90C is provided with an air guide portion 92 that guides cooling air for cooling the outer surface of the wall portion 90C. Further, the cooling fan 93 has a function of dissipating the heat received by the inner surface of the wall portion 90C to the outer surface of the wall portion 90C.

Further, inside the containment vessel 90, an air blower (not shown) is provided for the purpose of circulating the air inside the containment vessel 90 and enhancing the cooling effect. Specifically, the blower is a small fan or a wind guide plate (not shown) provided on the phosphor wheel 70 .

(Composition of endothermic paint)
An endothermic paint is, for example, a resin composition in which one or more kinds of metal oxides such as zinc oxide and cordierite are highly filled in a binder resin such as silicone. With this configuration, the heat-absorbing paint has a high infrared emissivity, and the heat of the heating element can be absorbed through infrared electromagnetic waves, and the heat can be radiated to the outside of the containment vessel 90 . Therefore, the heat receiving part 91A can realize high heat absorption performance and high heat radiation performance, and can suppress the temperature rise of the containment vessel 90 .

(Description of Heat Transfer Path in Light Source Device 10)
Main energy transfer paths in the light source device 10 will be described with reference to the schematic diagram of FIG. 7 .

The excitation light E emitted from the light source 20 is incident on the phosphor 73 of the phosphor wheel 70 via the condensing lens 30 . The phosphor 73 emits fluorescence F using the incident excitation light E as excitation energy. Fluorescence F is led to the color filter wheel 80 through the lens 31. FIG.

Here, in the fluorescence emission process by the excitation light E, energy that is not converted into fluorescence F, which is light energy, is accumulated as heat H in the phosphor wheel 70 .

The heat H generated in the phosphor 73 of the phosphor wheel 70 is dissipated from the phosphor 73 as heat conduction M, natural heat release N, and heat absorption A. Thermal conduction M conducts heat to the transparent substrate 71 . The natural heat dissipation N conducts heat directly from the phosphor 73 to the air in the containment vessel 90 . The heat absorption A is absorbed by the heat receiving portion 91A through infrared electromagnetic waves.

The heat conduction M and the natural heat dissipation N are further dissipated to the outside of the containment vessel 90 via heat conduction to the air inside the containment vessel 90 and heat conduction in the housing of the containment vessel 90 . By providing a heat receiving portion 91A coated with a heat absorbing paint inside any one of the wall portions 90A, 90B, 90D, 90E, and 90F other than the wall portion 90C and a heat radiating portion 91B outside any of the wall portions 90A, 90B, 90D, 90E, and 90F, the container The heat radiation effect of 90 to the outside can be improved.

After being absorbed by the heat receiving portion 91A, the heat absorption A is led to the heat radiating portion 91B through the wall portion 90C and radiated to the outside of the containment vessel 90 as heat radiation D. An air guide portion 92 is provided outside the wall portion 90C, and the heat radiation D is radiated to the outside from the heat radiating portion 91B with high heat dissipation efficiency by the cooling air guided to the air guide portion 92. FIG.

(effect)
In a light source device that uses fluorescence emission by excitation, it is preferable that a phosphor wheel, which is an excitation light source section, be hermetically housed in order to prevent adhesion of dust. However, when the phosphor wheel is sealed in a wheel house, which is a containment vessel, the ambient temperature inside the containment vessel increases due to the heat generated by the phosphor, and the heated air cannot circulate with the outside air. Therefore, for example, even if the phosphor of the phosphor wheel is blown with a fan, the phosphor wheel cannot be sufficiently cooled, and there are cases where the efficiency and reliability are lowered due to the temperature rise.

Furthermore, in a light source device that uses a solid-state light source such as a semiconductor laser to excite fluorescence emission, it is required to appropriately cool heat generated in a fluorescence conversion section that converts excitation light into fluorescence. Here, the phosphor wheel that emits fluorescence avoids local concentration of energy on the phosphor by rotating itself, thereby preventing temperature rise of the phosphor. On the other hand, there have been cases in which heat generation due to continuous excitation is large, the temperature of the phosphor rises, and the fluorescence conversion efficiency decreases due to temperature quenching of the phosphor.

In the present embodiment, in the storage container 90 for storing the phosphor wheel 70, the inner surface of the wall portion 90C that is in the immediate vicinity of the phosphor 73, which is the heat source, is coated with a heat-absorbing paint to form the heat receiving portion 91A. In addition to heat dissipation by heat conduction from the phosphor 73, by using heat transport to the heat receiving portion 91A by infrared electromagnetic waves, the phosphor 73 of the phosphor wheel 70 can be cooled more appropriately. .
(Modification)
The configuration of the cooling unit 91 according to Embodiment 1 is not limited to that shown in FIG. 5, and similar effects can be obtained even in the following configurations. Another configuration of the cooling unit 91 described above will be described below with reference to FIGS. 8 and 9. FIG.
FIG. 8 is a configuration diagram showing another configuration of the light source device according to the first embodiment of the present disclosure; FIG. 9 is a diagram showing another configuration of the cooling unit. 9 is a perspective view of the wall portion 90C viewed from the light emitting surface side of the transparent substrate 71. FIG.

As shown in FIGS. 8 and 9, the cooling section 910 is composed of a heat receiving section 91C and a heat radiating section 91D. The cooling unit 910 is inserted into the container 90 through an opening provided in the wall 90E (ceiling surface of the container 90).
The heat receiving portion 91C is plate-shaped. A heat absorbing paint is applied to the surface of the heat receiving portion 91C. The heat receiving portion 91</b>C is provided at least in front of the phosphor 73 that is the heat source of the phosphor wheel 70 . Note that the heat receiving portion 91</b>C may be provided so as to cover the entire surface of the phosphor wheel 70 .
The heat radiation part 91D is, for example, a radiation fin, and is provided outside the wall part 90E. Since one end of the heat receiving portion 91C and the heat radiating portion 91D are connected, the heat receiving portion 91C and the heat radiating portion 91D are thermally connected. The heat radiation part 91D is forcibly cooled by the fan 93 to obtain a cooling effect.

[Embodiment 2]
FIG. 10 is a diagram showing a configuration of a projection display apparatus according to Embodiment 2 of the present disclosure. In the following, the same components as those in FIG. 1 are denoted by the same reference numerals, and differences from the first embodiment will be mainly described.

Embodiment 1 is an example in which one DMD 41 is used as a spatial modulation element, and image display is performed by time-divisionally projecting an image corresponding to the reference image light generated by the light source device 10 in a time-divisional manner. conduct. In a second embodiment of the present disclosure, an example of a three-panel liquid crystal projector using liquid crystal displays (LCDs) 411R, 411G, and 411B, which are three spatial modulation elements, will be described.

(Configuration of light source device 111)
A projection-type image display device 101 of the present embodiment includes a light source device 111 that emits white light W. As shown in FIG.

Light source device 111 includes light source 20 , condenser lens 30 , diffuser plate 60 , phosphor wheel 701 provided with phosphor 730 , and lenses 31 and 32 . The light source 20 emits excitation light E. As shown in FIG. The condenser lens 30 collects the light emitted from the light source 20 . The phosphor wheel 701 emits fluorescence F when excited by the excitation light E. FIG. The lenses 31 and 32 collimate the fluorescence F emitted from the phosphor wheel 701 into substantially parallel light.

The light source 20 is an array light source 23 in which a semiconductor laser 21 that emits blue reference light Lb (for example, a wavelength of 455 nm) and a collimator lens 22 that collimates the light from the semiconductor laser 21 are arranged in a matrix. is.

FIG. 11 shows a configuration diagram of the phosphor wheel 701. As shown in FIG. FIG. 11(a) is a side cross-sectional view of the phosphor wheel 701 viewed from the +y direction in FIG. FIG. 11(b) is a front view of the phosphor wheel 701 viewed from the left side (-z direction in FIG. 10) of FIG. 11(a).

Unlike the phosphor wheel 70 used in the first embodiment, the phosphor wheel 701 is configured by annularly providing one type of phosphor 730 on a transparent substrate. Here, phosphor 730 is yellow phosphor Py that emits yellow fluorescence Fy including green reference light Lg and red reference light Lr, and emits yellow fluorescence Fy by excitation light E incident from light source 20 . Here, the phosphor wheel 701 is rotated by the motor 74 to dissipate heat accumulation to the phosphor 730 and cool the phosphor 730 .

The light source device 111 emits yellow fluorescence Fy including green reference light Lg and red reference light Lr excited by the phosphor wheel 701 by the excitation light E emitted from the light source 20, and blue light that is transmitted without being absorbed by the phosphor wheel 701. White light W is emitted by being mixed with the reference light Lb.

(overall structure)
The white light W emitted from the light source device 111 is uniformly illuminated onto the LCDs 411R, 411G, and 411B by the lens array 300, the lens array 301, the polarization conversion element 302, and the condenser lens 303. FIG. Here, the white light W emitted from the condenser lens 303 is split by the dichroic mirror 304C into the red reference light Lr and the cyan composite light Lc of the green reference light Lg and the blue reference light Lb. The cyan combined light Lc is split into green reference light Lg and blue reference light Lb by the mirror 305G.

After being reflected by the mirror 305R, the red reference light Lr passes through the lens 306R and the entrance-side polarization plate 307R, is modulated into image light by the LCD 411R (red LCD), and is guided to the color synthesis prism 421 through the exit-side polarization plate 308R. be killed.

After being reflected by the mirror 305G, the green reference light Lg passes through the lens 306G and the incident side polarizing plate 307G, is modulated into image light by the LCD 411G (green LCD), and is guided to the color synthesizing prism 421 through the outgoing side polarizing plate 308G. be killed.

After being reflected by mirrors 304B and 305B, blue reference light Lb passes through lens 306B and incident side polarizing plate 307B, is modulated into image light by LCD 411B (blue LCD), and passes through exiting side polarizing plate 308B to color synthesis prism 421. led to.

The blue reference light Lb, the green reference light Lg, and the red reference light Lr modulated into image light are synthesized by the color synthesizing prism 421 and enlarged and projected onto a screen (not shown) by the projection lens 50 .

(Structure of Phosphor Storage Container 901)
The configuration of the container 901 for the phosphor wheel 701 will be described with reference to FIG. The storage container 901 is a closed storage container that houses at least the phosphor wheel 701 of the light source device 111 . The containment vessel 901 is composed of wall portions 901A, 901B, 901C, 901D, 901E (ceiling surface), and 901F (bottom surface). In this embodiment, the container 901 accommodates the diffuser plate 60 and the lens 31 together with the phosphor wheel 701 . That is, the diffuser plate 60 is attached to a window portion (not shown) provided in the wall portion 901A so that a portion of the diffuser plate 60 enters the storage container 901 . Also, the lens 31 is attached to a lens attachment window (not shown) provided in the wall portion 901</b>C, and a portion of the flat side of the lens 31 is accommodated in the storage container 901 .

In this way, the diffuser plate 60 is a light passage that serves as a boundary between the inside and the outside of the wall portion 901A of the storage container 901 . The diffuser plate 60 has a light incident surface outside the wall portion 901A and a light exit surface inside the wall portion 901A.

The lens 31 also serves as a boundary between the inside and the outside of the wall portion 901C of the storage container 901, and has a light incident surface inside the wall portion 901C and a light exit surface outside the wall portion 901C.

The inner surfaces of the walls 901A, 901B, 901C, and 901D of the containment vessel 901 indicated by the dashed lines in FIG. A heat receiving portion 911A is provided. 12, the wall portions 901A, 901B, 901C, and 901D are provided with heat radiating portions 911B for radiating the heat absorbed by the heat receiving portions 911A to the outside of the containment vessel 901. As shown in FIG. The heat receiving portion 911A facing the heat source generated by the phosphor 730 is arranged close to the phosphor 730 of the phosphor wheel 701 in order to enhance the heat receiving effect.

Here, the heat-absorbing paint applied to the heat-receiving portion 911A is applied to the entire inner surface of the wall portion 901A except for the diffuser plate 60, which is the passage of light. In 901C, the coating is applied to the entire inner surface side except for the mounting portion of the lens 31 . In 901B and 901D, the entire inner surface is coated.

A heat radiation portion 911B that radiates the heat received by the wall portions 901A, 901B, 901C, and 901D is, for example, a heat radiation coating layer made of the same resin composition as the heat absorption coating. As another example of the heat radiating portion 911B, heat radiating fins integrally formed on the wall portion may be used.

The containment vessel 901 is placed in an air guide 921 to cool the outer surface of the containment vessel 901 . The containment vessel 901 is cooled by guiding the cooling air to the air guide section 921 in the +y direction, for example, using a duct and a cooling fan (not shown).

(effect)
In the present embodiment, in the storage container 901 that stores the phosphor wheel 701 , the heat generated in the storage container 901 is absorbed by the entire surface of the container and is dissipated to the outside, so that the phosphors 730 of the phosphor wheel 701 are more heated. It becomes possible to cool more appropriately.

[Embodiment 3]
FIG. 13 is a diagram showing the configuration of a projection display apparatus according to Embodiment 3 of the present disclosure. In the following, the same components as those in FIG. 10 are denoted by the same reference numerals, and differences from the second embodiment will be mainly described.

Embodiment 2 is an example of using a transmissive phosphor wheel 701 having phosphors 730 on a transparent substrate 71 as a fluorescence emitting unit. Specifically, it is a light source device in which the direction of incidence of excitation light E to phosphor 730 and the direction of emission of fluorescence F are arranged in a straight line. In Embodiment 3 of the present disclosure, a reflective phosphor wheel 702 having phosphors 730 on a metal substrate 712 is used, and an example of a three-panel liquid crystal projector in which excitation light E and fluorescence F are incident from the same direction will be described. do.

(Configuration of light source device 112)
The projection-type image display device 102 of this embodiment includes a light source device 112 that emits white light W. As shown in FIG.

Light source device 112 includes light source 20 , condenser lens 30 , diffuser plate 60 , wave plate 62 , and lenses 31 and 32 . The light source 20 emits excitation light E. As shown in FIG. Condensing lens 30 converges the light emitted from light source 20 onto phosphor wheel 702 via dichroic mirror 61 . The wave plate 62 is a λ/4 wave plate that rotates the polarization direction of the excitation light E by 90 degrees. The lenses 31 and 32 condense the light incident on the phosphor wheel 702 and collimate the emitted fluorescence F into substantially parallel light.

The light source 20 emits blue reference light Lb (for example, wavelength 455 nm) that is S-polarized excitation light E. As shown in FIG. The blue reference light Lb is reflected by the dichroic mirror 61 and then transmitted through the wavelength plate 62, which is a λ/4 wavelength plate, to be converted into circularly polarized light. The converted blue reference light Lb is condensed by the lens 31 and the lens 32 and enters the phosphor 730 of the phosphor wheel 702 .

Unlike the phosphor wheel 701, the phosphor wheel 702 is configured by providing a reflecting film 722 such as an aluminum increased reflection film on the surface of a metal substrate 712 such as aluminum, and applying a phosphor 730 to the surface of the reflecting film 722. be. With such a configuration, it is possible to construct a reflective phosphor wheel 702 in which the direction of incidence of excitation light E and the direction of emission of fluorescence F are the same. By using the metal substrate 712 with high thermal conductivity for the phosphor wheel 702, the heat generated by the phosphor 730 is diffused and the heat dissipation effect is enhanced. As a result, it is possible to construct a high-intensity white light source W that emits fluorescence F with a higher output by allowing excitation light E with a higher output to enter. Here, phosphor 730 is yellow phosphor Py that emits yellow fluorescence Fy including green reference light Lg and red reference light Lr, and emits yellow fluorescence Fy by excitation light E incident from light source 20 . Further, the blue reference light Lb that is not absorbed by the phosphor 730 is reflected by the reflective film 722, passes through the lenses 31 and 32, passes through the wavelength plate 62 again, is converted into P-polarized light, and is converted into P-polarized light by the dichroic mirror 61. pass through.

Thus, light source device 112 emits white light W by mixing yellow fluorescence Fy emitted from phosphor wheel 702 and blue reference light Lb not absorbed by phosphor 730 .

(Structure of Phosphor Storage Container 902)
The phosphor storage container 902 in Embodiment 3 is a closed storage container that stores at least the phosphor wheel 702 of the light source device 112 . A phosphor container 902 according to the third embodiment has the same configuration as that of the second embodiment, except for the configuration without the diffuser plate 60 and the window portion in which the diffuser plate 60 is arranged in the second embodiment. That is, the storage container 902 of Embodiment 3 is composed of wall portions 902A, 902B, 902C, 902D, 902E (ceiling surface), and 902F (bottom surface). In this embodiment, the storage container 902 houses the phosphor wheel 702 and the lens 31 that is the path of light. That is, the lens 31 is attached to a lens attachment window (not shown) provided in the wall portion 902C, and a portion of the flat side of the lens 31 is accommodated in the container 902 .

The containment vessel 902 forms a heat-receiving part by applying heat-absorbing paint to the inner surfaces of the walls 902A, 902B, 902C, 902D, 902E, and 902F, and cools the containment vessel 902 .

(effect)
In this embodiment, in the storage container 902 that stores the reflective phosphor wheel 702 , the heat generated in the storage container 902 is absorbed by the entire surface of the container and is radiated to the outside, so that the phosphor of the phosphor wheel 702 is 730 can be cooled more appropriately.

It should be noted that the above-described first to third embodiments are intended to illustrate the technology of the present disclosure, and therefore various modifications, replacements, additions, omissions, etc. may be made within the scope of the claims or equivalents thereof. can.

INDUSTRIAL APPLICABILITY The present disclosure is applicable to a light source device using a phosphor excitation light source and a projection display device using the same.

Reference Signs List 10, 111, 112 light source device 11 illumination device 12 image display unit 13 projection system 20 light source 21 semiconductor laser 30 condenser lens 31, 32, 33, 35, 36, 37 lens 34 rod integrator 41 DMD
42 total reflection prism 50 projection lens 70, 701, 702 phosphor wheel 71, 81 transparent substrate 72a, 83 antireflection film 72b dichroic film 73, 730 phosphor 73a first phosphor region 73b second phosphor region 74, 84 motor 75 transmission region 80 color filter wheel 82 dichroic film 82a, 82b, 82c color filter 85 light diffusion region 90, 901, 902 container 90A, 90B, 90C, 90D, 90E, 90F wall 901A, 901B, 901C, 901D, 901E , 901F wall portion 902A, 902B, 902C, 902D, 902E, 902F wall portion 91, 901 cooling portion 91A, 911A heat receiving portion 91B, 911B heat radiation portion 92, 921 air guide portion 306R, 306G, 306B lens 100, 101, 102 projection type image display device E excitation light F fluorescence H heat generation М heat conduction N natural heat dissipation A heat absorption D heat dissipation

Claims (12)

an excitation light source;
a fluorescent plate that emits fluorescence with excitation light from the excitation light source;
an air guide section through which cooling air flows;
a storage container positioned outside the air guide section and containing the fluorescent plate;
The containment vessel is
a heat-receiving layer at a position facing the fluorescence emission surface of the fluorescent plate on the inner surface thereof;
and a heat dissipation layer on its outer surface,
The heat-receiving layer and the heat-dissipating layer are thermally connected and are made of the same material,
Light source device. 2. The light source device according to claim 1, wherein said heat receiving layer is a layer of heat absorbing paint. 2. The light source device according to claim 1, wherein said heat receiving layer is a plated layer. The light source device according to claim 1, wherein the heat-receiving layer is an alumite layer. 2. The light source device according to claim 1, wherein said heat receiving layer and said heat radiating layer are provided facing each other with a wall portion of said container interposed therebetween. 2. The light source device according to claim 1, wherein said fluorescence emitting surface of said fluorescent plate is provided with a phosphor, and said heat receiving layer is provided at a position facing at least the front of said phosphor. The light source device according to claim 1, wherein the heat dissipation layer is a heat dissipation paint layer. 3. The light source device according to claim 2, wherein said heat absorbing paint layer is composed of a resin composition containing a binder resin and one or more metal oxides. 2. The light source device according to claim 1, wherein said heat dissipation layer constitutes a part of a wall surface of said air guide section. 10. The light source device according to claim 9, wherein the heat dissipation layer constitutes only one surface of wall surfaces of the air guide section. 11. The light source device according to claim 10, wherein said one surface is a surface along the direction of the wind flowing through said air guide section. A light source device according to claim 1;
an illumination device that homogenizes reference light emitted from the light source device and emits illumination light;
a video display unit that modulates the illumination light from the lighting device with a video signal and emits the video light;
a projection system that enlarges and projects the image light from the image display unit;
Projection type image display device.

Images