JP2019091011A - Phosphor wheel and light conversion device including the same - Google Patents

Abstract

A phosphor wheel with improved cooling performance without affecting the wavelength conversion efficiency of light and a light conversion device including the same are provided. A phosphor wheel 13 includes a disk-shaped member 30 that is rotated about a rotation axis X, and a phosphor layer 16 that is disposed on a first surface 13a of the disk-shaped member 30. The disk-shaped member 30 has a hollow box structure that forms a sealed space. A refrigerant having a volume smaller than the volume of the sealed space is sealed in the sealed space when the liquid state vaporizes from a liquid state to a gas state at a predetermined temperature or higher. [Selection] Figure 9

Description

  The present disclosure relates to a phosphor wheel and a light conversion device provided with the same.

  In a projection type display device used for projection mapping or the like, for example, a phosphor wheel in which a phosphor layer is disposed on one surface of a disk is widely used as a device for converting the wavelength of light. The phosphor layer wavelength-converts the irradiated, for example, blue laser light into green or orange light, but generates a large amount of heat when converting. Therefore, it is necessary to perform cooling appropriately.

  Patent Document 1 discloses a phosphor wheel. In this phosphor wheel, a sealed housing is provided on one side of the disc. A large number of phosphor particles and a refrigerant are enclosed in the sealed case. Further, a gas flow area in which the refrigerant vaporized by heat at the time of wavelength conversion can flow and a flow section having a plurality of fine flow paths in which the liquefied refrigerant can flow are formed in the inside of the sealed housing . The fine channels are formed by the gaps between the phosphor particles.

Unexamined-Japanese-Patent No. 2017-27685

  In the phosphor wheel of Patent Document 1, since a void is required between the phosphor particles in order to form a fine flow path, the density of the phosphor particle is lower than in the case where the void is not provided, and the wavelength per area is Conversion efficiency is reduced.

  The present disclosure provides a phosphor wheel with improved cooling performance without affecting the wavelength conversion efficiency of light, and a light conversion device including the same.

The phosphor wheel in the present disclosure is
A disc-shaped member which is rotated about a rotation axis;
And a phosphor layer disposed on one side of the disk-like member.
The disk-like member has a hollow box structure that forms a closed space.
In the sealed space, a refrigerant which is vaporized from a liquid state to a gas state at a predetermined temperature or higher and has a volume smaller than the volume of the sealed space in the liquid state is sealed.

  The present disclosure further provides a light conversion device comprising the phosphor wheel in the present disclosure.

  According to the present disclosure, it is possible to provide a phosphor wheel with improved cooling performance and a light conversion device including the same without affecting the conversion efficiency.

FIG. 1 is a schematic view showing a projection type display device in a first embodiment. It is sectional drawing which showed the structure of the principal part of a light conversion apparatus. It is an external appearance perspective view of a light conversion apparatus. It is the perspective view which showed the structure of the heat sink arrange | positioned to the inside of a light conversion apparatus, and the heat sink thermally connected to the heat sink. It is a top view of the heat sink of FIG. 4A, and a heat sink. It is sectional drawing which showed the internal structure of the light conversion apparatus of FIG. It is the perspective view which showed the structure of the case part of the light conversion apparatus of FIG. It is the perspective view which showed the 1st surface side of a fluorescent substance wheel. It is the top view which showed the 1st surface side of a fluorescent substance wheel. It is a side view of a phosphor wheel. It is sectional drawing of a fluorescent substance wheel. It is the top view which showed the 1st surface side of a fluorescent substance wheel in the partially broken state. It is the top view which showed the 1st surface side of the fluorescent substance wheel in rotation in partial fracture state. FIG. 10 is a cross-sectional view of a phosphor wheel in Embodiment 2; FIG. 21 is a plan view showing a first surface side of the phosphor wheel in a rotating state in Embodiment 2 in a partially broken state. FIG. 21 is a plan view showing the first surface side of the phosphor wheel in Embodiment 3 in a partially broken state. FIG. 7 is a view for explaining the distribution of the refrigerant in the process from the stationary state of the phosphor wheel to the steady rotation in the first embodiment. FIG. 17 is a view for explaining the distribution of the refrigerant in the process from the stationary state of the phosphor wheel to the steady rotation in the third embodiment. FIG. 18 is a view for explaining a modification of the phosphor wheel in the third embodiment. FIG. 21 is a plan view showing the first surface side of the phosphor wheel in Embodiment 4 in a partially broken state. FIG. 21 is a cross-sectional view schematically showing the vent opening of the phosphor wheel in a modification of the fourth embodiment; FIG. 20 is a plan view showing the first surface side of the phosphor wheel in the fifth embodiment. FIG. 21 is a plan view showing a first surface side of a phosphor wheel in a sixth embodiment. FIG. 20 is a cross-sectional view of a phosphor wheel in a sixth embodiment. FIG. 20 is a side view of a phosphor wheel in a sixth embodiment. FIG. 21 is a plan view showing a first surface side of a phosphor wheel in a seventh embodiment. FIG. 20 is a cross-sectional view of a phosphor wheel in a seventh embodiment.

  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 description of already well-known matters and redundant description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art.

  In addition, applicants provide the attached drawings and the following description so that those skilled in the art can fully understand the present disclosure, and intend to limit the subject matter described in the claims by these. Absent.

Embodiment 1
A phosphor wheel device equipped with a phosphor wheel according to an embodiment of the present disclosure, a light conversion device, and a projector (projection display device) 100 will be described.

1. Configuration 1-1. Configuration of Projector FIG. 1 is a diagram showing a schematic configuration of a projector according to the first embodiment of the present disclosure. FIG. 1 shows a projector (an example of a projection type display device) to which the phosphor wheel of the present disclosure is applied, and the phosphor wheel of the present disclosure can also be applied to projection type display devices having other configurations. It is.

  The projector 100 is a digital light processing (DLP) type video display device equipped with one spatial light modulation element (for example, DMD (digital mirror device) 7 (display element)) that modulates light in accordance with a video signal. The light conversion device 20 includes blue LDs (laser diodes) 2a and 2b (light sources), various optical components, and a phosphor wheel device 10 for emitting fluorescence excited by laser light.

  Although projector 100 according to the present embodiment employs a 3-chip DLP method in which three DMDs 7 corresponding to R, G, and B primary colors are mounted, FIG. 1 shows only one DMD 7 for convenience of description. Is shown.

  In the projector 100 according to the present embodiment, as shown in FIG. 1, two blue LDs 2a and 2b as light sources, a separation mirror 3a, mirrors 3b and 3c, dichroic mirrors 3d and mirrors 3e, 3f and 3g as optical components. Lenses 4a to 4h, a rod integrator 5, a TIR (total reflection) prism 6a, a color prism 6b, a DMD 7, a projection lens 8, and a light conversion device 20 are provided.

The blue LDs 2a and 2b are light sources of the projector 100. The blue LDs 2a and 2b are configured to include a plurality of (m × n) LDs in each of the vertical and horizontal directions, and are arranged in directions orthogonal to each other. Thereby, the light radiate | emitted from blue LD2a, 2b advances to the direction orthogonal to each other.
The separation mirror 3a is provided in the vicinity of the intersection where the laser beams emitted from the two blue LDs 2a and 2b intersect, and separates the laser beams emitted from the respective blue LDs 2a and 2b in two directions.

  The mirrors 3b and 3c convert the traveling directions of the laser light traveling in the two directions separated by the separation mirror 3a by 90 degrees.

  The dichroic mirror 3d is configured using a special optical material, and reflects light of a specific wavelength and transmits light of other wavelengths. In the present embodiment, the blue laser light emitted from the blue LDs 2a and 2b is transmitted, and the red light and the green light converted from the blue laser light are reflected in the phosphor wheel device 10 described later.

  The mirrors 3e, 3f, 3g guide the light of the three primary colors of R, G, B transmitted or reflected by the dichroic mirror 3d to the projection lens 8 disposed on the most downstream side.

  The lenses 4a to 4h condense or collimate blue laser light emitted from the blue LDs 2a and 2b as light sources, and red light and green light obtained by converting blue laser light in the phosphor wheel device 10.

  The rod integrator 5 makes the illuminance of incident light uniform. The light incident on the rod integrator 5 repeats total reflection on the inner circumferential surface of the rod integrator 5 and is emitted as a uniform illuminance distribution on the exit surface. The rod integrator 5 is provided at a position where the light reflected by the mirror 3e is incident.

  The TIR (total reflection) prism 6a uses total reflection to change the traveling direction of the incident light.

  The color prism 6b separates the incident light into three primary colors of R, G, and B, and reflects the light to the three DMDs 7 corresponding to the respective colors disposed downstream.

  Three DMDs 7 are provided to correspond to one of the three primary colors of R, G, and B, respectively. Then, the DMD 7 modulates the incident light with a video signal, and emits the modulated light to the projection lens 8 through the color prism 6 b and the TIR (total reflection) prism 6 a.

  The projection lens 8 is disposed on the most downstream side of the optical components mounted on the projector 100, and projects the light incident through the TIR prism 6a, the DMD 7, and the color prism 6b on a screen not shown. .

  The light conversion device 20 is a device that converts blue laser light emitted from blue LDs 2 a and 2 b described later into red light and green light by a phosphor, and includes a phosphor wheel device 10. The configuration of the light conversion device 20 including the phosphor wheel device 10 will be described in detail later.

<Projection of Image by Projector 100>
The laser beams emitted from the two blue LDs 2a and 2b are distributed in two directions by the separation mirror 3a disposed near the intersection of the two laser beams.

  Among them, the first blue laser light passes through the dichroic mirror 3d through the lens 4c, the mirror 3c, and the lens 4d. Then, after passing through the lens 4 e, the light is reflected by the mirror 3 e in the direction of 90 degrees and enters the rod integrator 5.

  The second blue laser light passes through the dichroic mirror 3 d via the lens 4 a, the mirror 3 b, and the lens 4 b, and is irradiated to the phosphor layer 16 of the phosphor wheel 13 of the phosphor wheel device 10. At this time, the second blue laser light excites the red phosphor and the green phosphor of the phosphor layer 16 to be converted into red light and green light.

  At this time, the energy is dispersed by rotating and driving the phosphor wheel 13 by the motor 14, so that the burn-in can be prevented when the blue laser light irradiates the red phosphor and the green phosphor.

  The converted red light and green light are reflected by the dichroic mirror 3 d in the direction of 90 degrees and enter the rod integrator 5.

  The lights of the three primary colors R, G, and B are mixed in the rod integrator 5, and enter the boundary layer of the TIR prism 6a through the lens 4f, the mirrors 3f and 3g, and the lens 4h. In the TIR prism 6a, since it is a total reflection angle, the lights of the three primary colors of R, G and B are reflected and proceed to the color prism 6b.

  In the color prism 6 b, the lights separated into the three primary colors of R, G, and B respectively enter three DMDs 7.

  The light beams that form and reflect an image in the DMD 7 are combined by the color prism 6 b, pass through the boundary layer of the TIR prism 6 a, enter the projection lens 8, and an image is projected onto the projection screen.

  In the projector 100 according to the present embodiment, the blue laser light emitted from the blue LDs 2 a and 2 b as the excitation light source is a red phosphor and a green phosphor contained in the phosphor layer 16 provided on the surface of the phosphor wheel 13. To produce red light and green light. At this time, not all the energy of the blue laser light is converted into fluorescence, but a part of it is converted into heat energy, which raises the temperature of the red phosphor and the green phosphor.

  Here, when the temperature rises, the phosphor may decrease the light conversion efficiency, or the binder that fixes the phosphor on the phosphor wheel 13 to form the phosphor layer 16 may cause thermal discoloration or the like. There is. For this reason, the phosphor wheel 13 is rotationally driven by the motor 14 to suppress the temperature rise of the phosphor.

  However, the output of the excitation light (laser light) also becomes stronger as the brightness of the projector 100 is increased, and it is not possible to sufficiently cool the phosphor layer 16 and the surrounding area simply by rotating the phosphor wheel 13. It is necessary to apply cooling air to the body layer 16 and the surrounding area to actively cool the phosphor.

  Therefore, in the present embodiment, the phosphor wheel 13 itself is provided with a cooling means, the details of which will be described later.

1-2. Configuration of Light Conversion Device The configuration of the light conversion device will be described with reference to FIG. 2, FIG. 3, FIG. 4A, and FIG. 4B. FIG. 2 is a cross-sectional view showing the structure of the main part of the light conversion device 20. As shown in FIG. FIG. 3 is an external perspective view of the light conversion device 20. As shown in FIG. FIG. 4A is a perspective view showing a configuration of a heat absorber disposed inside the light conversion device and a heat collector thermally connected to the heat absorber. FIG. 4B is a plan view of the heat sink and the heat sink of FIG. 4A.

  As shown in FIG. 2, the light conversion device 20 includes a phosphor wheel device 10, a heat absorber 21, a heat collector 22, an optical lens 23, and a heat pipe 24, which will be described later.

  The phosphor wheel device 10 converts the blue laser light emitted from the blue LDs 2 a and 2 b into red light and green light by irradiating the phosphor with the blue laser light. The detailed configuration of the phosphor wheel device 10 will be described later in detail.

  The heat sink 21 is arrange | positioned inside the case part 11 of the fluorescent substance wheel apparatus 10, as shown in FIG. The heat absorber 21 has a fin structure through which the air flow formed in the light conversion device 20 passes, and absorbs heat from the air flow including the heat generated in the phosphor layer 16 of the phosphor wheel 13 Do. And the heat sink 21 is being fixed to the outer cylinder part 11b contained in the case part 11 of the fluorescent substance wheel apparatus 10 shown in FIG. 3, and the bottom part 11d using a screw. Moreover, as shown to FIG. 4A and FIG. 4B, the heat sink 21 has the some fin 21a, and is thermally connected with the heat sink 22 via the heat pipe 24. As shown in FIG.

  The plurality of fins 21a are made of metal having high thermal conductivity, and are radially arranged in a plan view as shown in FIG. 4B.

  Thereby, the air flow blown to the vicinity of the center of the phosphor wheel 13 can be guided radially outward. When being induced, the air flow passes through the communicating portion 11 g between the wall 21 b of the heat absorber 21 and the phosphor wheel 13, and the peripheral portion of the phosphor wheel 13 on which the phosphor layer 16 is disposed. Since the light passes through the back side, the heat generated in the phosphor can be efficiently cooled.

  In addition, when the air flow passes between the plurality of fins 21 a, the heat contained in the air flow can be moved to the fins 21 a side to reduce the temperature of the air flow.

  The heat sink 22 is disposed outside the case portion 11 of the phosphor wheel device 10, as shown in FIG. And the heat sink 22 is thermally connected with the heat sink 21 via the heat pipe 24 as shown in FIG. 3 etc., and the heat of the air flow absorbed by the heat sink 21 is transferred to the case 11. Exhaust heat out of the In addition, the heat sink 22 has a fin structure including a plurality of fins 22a disposed on the outer peripheral surface.

  The plurality of fins 22a are made of metal having high thermal conductivity, and as shown in FIGS. 4A and 4B, the plurality of fins 22a are disposed along the direction orthogonal to the longitudinal direction of the heat pipe 24. Exhaust heat to the air outside the house.

  The optical lens 23 is attached to the opening part formed in the cover part 11a of the case part 11 via the optical lens holding component 23a, as shown to FIG. 2 and FIG. Then, as shown in FIG. 1, the optical lens 23 passes excitation light for exciting the phosphor of the phosphor layer 16 of the phosphor wheel 13 and collects light emitted from the phosphor of the phosphor layer 16. The light is guided in the direction of the dichroic mirror 3d.

  The heat pipe 24 thermally connects the heat absorber 21 and the heat collector 22 as shown in FIGS. 4A and 4B. A hollow space is formed inside the heat pipe 24. A small amount of water is enclosed in the hollow space, and when heat is received at the heat absorber 21 side, it evaporates and moves as steam to the heat radiator 22 side. The steam that has moved to the heat rejector 22 side is cooled and liquefied in the heat rejector 22 and becomes water. Here, after being cooled on the heat rejector 22 side to become water, the water moves in the hollow space by capillary action and moves again to the heat absorber 21 side.

  That is, in the heat pipe 24, a small amount of water is vaporized on the heat absorber 21 side and liquefied on the heat radiator 22 side to function as a cooling medium.

1-3. Configuration of Phosphor Wheel Device The structure of the phosphor wheel device 10 will be described with reference to FIGS. 5 and 6 in addition to the above-described drawings. FIG. 5 is a cross-sectional view showing an internal configuration of the light conversion device of FIG. 6 is a perspective view showing the structure of the case portion of the light conversion device of FIG.

  As shown in FIG. 2, the phosphor wheel device 10 includes a case portion 11, a phosphor wheel 13, a motor 14, and a pressure fan 15.

  The case portion 11 has a cylindrical shape (see FIG. 3), and forms an enclosed space in which the phosphor wheel 13, the motor 14, the heat absorber 21 and the like are accommodated. As shown in FIG. 5, the case portion 11 has an outer cylindrical portion 11b and an inner cylindrical portion 11c which are disposed substantially concentrically. The outer cylindrical portion 11 b and the inner cylindrical portion 11 c communicate with each other at both ends in the direction of the axis X parallel to the rotation center of the phosphor wheel 13 to form an air flow circulation path.

  Furthermore, at least a part of the portion in contact with the outside air of the case portion 11 is formed of metal. As a result, even when the inside of the case 11 is warmed by the heat generated in the phosphor portion of the phosphor layer 16 of the phosphor wheel 13 installed in the case 11, the metal is formed of a metal having a high thermal conductivity. Heat can be efficiently dissipated to the outside through the above-described part of the case portion 11. In addition, it is preferable that the said one part of case part 11 formed with a metal is the cover part 11a by the side of the fluorescent substance wheel 13, for example.

  In the vicinity of the lid portion 11 a disposed close to the phosphor layer 16 of the phosphor wheel 13, as shown in FIG. 5, before the air flow to which the heat generated in the phosphor layer 16 is transmitted enters the heat absorber 21. Pass by. As a result, even when the lid 11a is heated by the air flow that has passed through the vicinity of the phosphor layer 16 of the phosphor wheel 13 and is heated, the heat of the lid 11a can be effectively released to the outside. As a result, the heat of the air flow can be released to the outside more effectively as compared with other members (the outer cylindrical portion 11 b, the inner cylindrical portion 11 c, and the bottom portion 11 d) constituting the case portion 11.

  The cover 11a is a substantially square plate-like member as shown in FIG. 3, and as shown in FIG. 2, it covers the surface of the case 11 on the phosphor layer 16 side of the phosphor wheel 13 It is attached. Further, the lid 11a is formed with an opening 11aa into which the above-described optical lens 23 through which blue laser light and fluorescence (red, green) pass is loaded.

  The opening 11aa is a through hole formed at a position facing the phosphor layer 16 of the phosphor wheel 13 in the lid 11a. The optical lens 23 is attached to the opening 11 aa via the optical lens holding component 23 a.

  The outer cylinder part 11b is a substantially cylindrical member which forms the side surface of the case part 11, as shown to FIG. 3, FIG.

  The inner cylindrical portion 11c is a cylindrical member disposed concentrically with the outer cylindrical portion 11b, and is disposed on the inner peripheral side of the outer cylindrical portion 11b. The inner cylindrical portion 11 c is disposed at a position adjacent to the inner peripheral side of the heat absorber 21. Furthermore, the inner cylindrical portion 11c is formed so that the dimension in the direction of the axis X is smaller than that of the outer cylindrical portion 11b. Thereby, the outer cylinder part 11b and the inner cylinder part 11c connect in the both ends in an axial X direction.

  The bottom portion 11d is attached to the outer cylindrical portion 11b so as to cover the surface of the case 11 opposite to the surface on which the lid portion 11a is provided in the direction of the axis X, as shown in FIG.

  The air flow rise guide 11 e is a guide member for reversing and rising the air flow cooled by passing through the heat absorber 21, and is provided on the bottom 11 d so as to protrude toward the inner space of the case 11. The air flow raising guide 11e has a substantially conical shape with the axis X as a center, and the air flow which has flowed from the outer peripheral side to the inner peripheral side of the inner cylindrical portion 11c is raised by the wind force of the pressurizing fan 15. Lead.

  Therefore, when the phosphor wheel 13 rotates, the air flow generated by the pressurizing fan 15 has a diameter along the surface of the phosphor wheel 13 where the phosphor layer is not provided from the inner peripheral side of the inner cylindrical portion 11c. Guided outward. Then, the air flow is cooled by passing through the inside of the heat absorber 21 while moving downward in the axial X direction. The air flow cooled by passing through the heat absorber 21 is returned again to the inner circumferential side of the inner cylindrical portion 11 c from the communication portion 11 h opposite to the phosphor wheel 13. As described above, in the internal space of the case portion 11, a circulation path of the air flow generated by the pressurizing fan 15 is formed when the phosphor wheel 13 rotates.

  Here, as shown in FIG. 5, the motor 14 for rotationally driving the phosphor wheel 13 is disposed on the flow path of the air flow cooled by the heat absorber 21. Therefore, even when heat is generated in the motor 14 when the phosphor wheel 13 is continuously rotated, the motor 14 can be effectively cooled by the cooling air.

  Further, the pressurizing fan 15 is disposed in the circulation path of the air flow formed in the case portion 11, and blows in the flowing direction of the air flow in the circulation path. Further, the pressure fan 15 is disposed at a position between the phosphor wheel 13 and the air flow rising guide 11 e in the case portion 11. That is, the pressurizing fan 15 is disposed most downstream in the circulation path of the air flow. Therefore, the air flow can be intensified at the most downstream side where the air flow is the weakest. As a result, the flow velocity of the air flow in the vicinity of the phosphor wheel 13 or the motor 14 can be increased to further enhance the cooling effect.

  FIG. 7 is a perspective view showing the first surface side of the phosphor wheel. FIG. 8 is a plan view showing the first surface side of the phosphor wheel. As shown in FIG. 7 and FIG. 8, the phosphor wheel 13 includes a disk-shaped disk-shaped member 30 and a phosphor layer 16 disposed on the first surface 13 a (one surface) of the disk-shaped member 30. Equipped with At the center of the disk-shaped member 30, a central hole 13h is provided in which the motor 14 (see FIG. 5) is fitted. The phosphor wheel 13 (disk member 30) is fixed to the rotating member 14a of the motor 14 so as to be thermally conductive as shown in FIG. When the phosphor wheel 13 is irradiated with blue laser light, the temperature of the phosphor wheel 13 becomes higher than the temperature of the rotating member 14 a. Therefore, the heat of the phosphor wheel 13 which has become high temperature is transmitted and radiated to the rotating member 14a, and the temperature in the vicinity of the center hole 13h of the phosphor wheel 13 becomes lower than the temperature on the outer peripheral side. That is, the rotating member 14a functions as a cooling member.

  The phosphor layer 16 has an annular shape centered on the rotation axis X. The phosphor layer 16 is formed, for example, by applying phosphor particles in an annular shape on the first surface 13a.

  FIG. 9 is a side view of a phosphor wheel. FIG. 10 is a cross-sectional view of a phosphor wheel. FIG. 10 is a view showing a phosphor wheel in a rotating state in a section 10-10 of FIG. 12 described later.

  An optical lens 23 is disposed to face the phosphor layer 16 on the first surface 13 a of the phosphor wheel 13. In the present embodiment, the light conversion device wavelength-converts the blue laser light emitted to the phosphor layer 16 on the first surface 13 a of the phosphor wheel 13 via the optical lens 23, and converts the wavelength-converted light to the optical lens An example having a configuration to be used back to the 23 side will be described.

  The disk-shaped member 30 has a first disk portion 30a having a first surface 13a on which the phosphor layer 16 is disposed, and a second disk portion 30 opposed to the first disk portion 30a with a gap of a predetermined length interposed therebetween. And 30b. Moreover, the disk shaped member 30 has the cylindrical outer peripheral surface part 30c which connects the outer periphery of the 1st disc part 30a, and the outer periphery of the 2nd disc part 30b. Furthermore, the disk-shaped member 30 has an inner circumferential surface portion 30d connecting the inner circumferential edge of the first disk portion 30a and the inner circumferential edge of the second disk portion 30b. An annular closed space Sp centered on the rotation axis X is formed inside the disc-like member 30 by the first disc portion 30a, the second disc portion 30b, the outer peripheral surface portion 30c, and the inner peripheral surface portion 30d. . That is, the disk-shaped member 30 has a hollow box structure that forms the closed space Sp.

  FIG. 11 is a plan view showing the first surface side of the phosphor wheel in a partially broken state. Air and a refrigerant 41 are enclosed in the enclosed space Sp. The refrigerant 41 is, for example, water. The refrigerant 41 may be, for example, an alternative fluorocarbon. The amount of the refrigerant 41 and the air pressure in the enclosed space Sp are set to vaporize the refrigerant 41 in the enclosed space Sp from a liquid state to a gas state at a predetermined temperature or higher. The enclosed space is about 0.5 atm to 2.0 atm (500 hPa to 2000 hPa). The predetermined temperature can be, for example, a temperature at which the wavelength conversion efficiency of the phosphor forming the phosphor layer 16 starts to decrease with a gradient of a certain degree or more. Further, the predetermined temperature is higher than the temperature of the refrigerant before the phosphor is excited by the laser light, and lower than the temperature of the refrigerant after the phosphor is excited by the laser light. The predetermined temperature is, for example, 70 to 160 ° C.

  FIG. 11 shows the state of the refrigerant 41 when the rotation axis X of the phosphor wheel 13 is arranged horizontally. When the phosphor wheel 13 is not rotating, the refrigerant 41 is accumulated in the lower part of the closed space Sp. In the phosphor wheel of the present disclosure, the rotation axis may be disposed in the vertical direction, or may be disposed in a direction inclined with respect to the vertical direction.

  In the present embodiment, the first disc portion 30a of the disc-like member 30 is constituted by the first disc member 31, and the second disc portion 30b, the outer peripheral surface portion 30c, and the inner peripheral surface portion 30d are second discs. It is constituted by a member 32. The first disc member 31 and the second disc member 32 are made of copper. The first disc member 31 and the second disc member 32 may not be made of copper, but may be made of another metal such as aluminum. The first disc member 31 and the second disc member 32 are joined by, for example, diffusion bonding. Specifically, the first disc member 31 and the second disc member 32 are joined by heating them to a predetermined temperature for a predetermined time and sandwiching them with a predetermined pressure in a state where they are arranged in a predetermined positional relationship. Be done. An injection hole (not shown) for injecting the refrigerant 41 is provided in advance in at least one of the first disk portion 30a and the second disk portion 30b, and a predetermined amount of the refrigerant 41 is injected to obtain an air pressure After the inside of the enclosed space Sp is adjusted to a predetermined air pressure, it is closed by a caulking plug or metal wax.

2. Operation FIG. 12 is a plan view showing the first surface side of the rotating phosphor wheel in a partially broken state. When the phosphor wheel 13 (disk member 30) is rotating about the rotation axis X, the refrigerant 41 in a liquid state is annularly distributed on the outer peripheral side in the sealed space Sp due to the centrifugal force at the time of rotation . At this time, as also shown in FIG. 10, the refrigerant 41 is arranged so that the entire area of the annular phosphor layer 16 overlaps with the distribution area of the refrigerant 41 in the liquid state, as viewed in the rotational axis X direction. Volume is set. When the blue laser light is irradiated to the phosphor layer 16, the phosphor layer 16 generates heat, and this heat is transferred to the refrigerant 41 through the first disc portion 30a. When the temperature of the refrigerant 41 becomes equal to or higher than a predetermined temperature, the refrigerant 41 is vaporized. At this time, the first disc portion 30a and the phosphor layer 16 are cooled by the latent heat of vaporization. The vaporized refrigerant moves to the inner peripheral side in the enclosed space Sp as indicated by the arrow Z1. The inner peripheral side of the disk-like member 30 is connected to the rotating member 14a of the motor 14 as described above, and the temperature of the disk-shaped member 30 is lower than that of the outer peripheral side. The liquefied refrigerant 41 moves to the outer peripheral side in the enclosed space Sp as indicated by the arrow Z2 by centrifugal force. By continuously performing the vaporization and liquefaction cycle, the phosphor layer 16 is continuously cooled.

  According to the present embodiment, the cooling effect of the phosphor layer 16 is improved. Therefore, the time for which the blue laser light is applied to the phosphor layer 16 can be made longer than in the past. Therefore, the rotational speed of the phosphor wheel 13 can be reduced, and the motor 14 can be miniaturized to reduce noise and vibration. In addition, as the cooling effect of the phosphor layer 16 is improved, the phosphor wheel 13 itself can be miniaturized.

  In addition, since the liquid refrigerant 41 is enclosed in the disk-like member 30, the refrigerant 41 is pressed to the outer peripheral side of the closed space Sp of the disk-like member 30 by the centrifugal force acting on the refrigerant 41 during rotation. The rotational balance of the phosphor wheel 13 is adjusted autonomously. Therefore, the operation of adjusting the rotational balance of the phosphor wheel 13 at the time of manufacturing the light conversion device 20 or the like is reduced.

  Moreover, since it is not necessary to provide a fine flow path etc. like patent document 1 in the fluorescent substance layer 16, the density of fluorescent substance particle does not fall like patent document 1. FIG. Therefore, wavelength conversion efficiency higher than that of Patent Document 1 can be obtained in the phosphor layer 16. Therefore, according to the present embodiment, it is possible to provide the phosphor wheel 13 in which the cooling performance is improved without adversely affecting the conversion efficiency.

  In the case where the blue laser light is not irradiated over the full width in the radial direction of the phosphor layer 16 but is irradiated to only a part of the area, an irradiation area of the phosphor layer 16 to which the blue laser light is irradiated. Even if the volume of the refrigerant 41 is set so that Ab (an area having the diameter width of the laser beam convergence point Bs) overlaps the distribution area of the refrigerant 41 in the liquid state where it is annularly distributed in the rotational axis X direction. Good. As a result, the amount of the refrigerant 41 enclosed can be reduced, and the inertia at the start of rotation can be reduced. Therefore, the load on the motor 14 can be further reduced, and the motor 14 can be further miniaturized.

3. Effect, Etc. The phosphor wheel 13 of the present embodiment includes the disk-shaped member 30 rotated about the rotation axis X, and the phosphor layer disposed on the first surface 13 a (one surface) of the disk-shaped member 30. And 16. The disk-shaped member 30 has a hollow box structure that forms a closed space Sp. In the closed space Sp, a refrigerant 41 having a volume smaller than the volume of the closed space Sp is sealed, which is vaporized from a liquid state to a gas state at a predetermined temperature or higher.

  Thereby, the phosphor wheel 13 with improved cooling performance and the light conversion device 20 including the same can be provided without affecting the conversion efficiency.

  Further, in the phosphor wheel 13 of the present embodiment, the phosphor layer 16 has an annular shape centered on the rotation axis X. The enclosed space Sp is an annular space centered on the rotation axis X. When the disk-shaped member 30 rotates around the rotation axis X, and the refrigerant 41 in a liquid state is annularly distributed on the outer peripheral side in the enclosed space Sp due to the centrifugal force of the rotation, The volume of the refrigerant 41 is set such that the entire region of the phosphor layer 16 overlaps the distribution region of the refrigerant 41 in the liquid state in which the entire region is annularly distributed.

  Thus, the entire radial area (full width) of the phosphor layer 16 can be properly cooled.

  When the disk-shaped member 30 rotates around the rotation axis X, and the refrigerant 41 in a liquid state is annularly distributed on the outer peripheral side in the enclosed space Sp due to the centrifugal force of rotation, the rotation axis X direction The volume of the refrigerant 41 may be set so that at least the irradiation area Ab of the phosphor layer 16 to be irradiated with the blue laser light overlaps the distribution area of the refrigerant 41 in the liquid state distributed in an annular shape. . Thereby, the area | region to which at least blue laser beam is irradiated among the fluorescent substance layers 16 can be cooled appropriately.

  Further, in the present embodiment, the phosphor wheel 13 of the present embodiment and blue LDs 2a and 2b (light sources) for emitting light for exciting the phosphor of the phosphor layer 16 of the phosphor wheel 13 are provided. A light conversion device 20 is provided.

  The first embodiment of the phosphor wheel in the present disclosure has been described above. Hereinafter, Embodiments 2 to 7 will be described as variations of the phosphor wheel in the present disclosure. In the description of the second to seventh embodiments, components having the same or similar functions are denoted by the same reference numerals.

Second Embodiment
The second embodiment will be described. The second embodiment will be described focusing on differences from the first embodiment.

  FIG. 13 is a cross-sectional view of the phosphor wheel in the second embodiment. FIG. 13 is a cross-sectional view of the phosphor wheel 213 in a rotating state, taken along line 13-13 in FIG. FIG. 14 is a plan view showing the first surface side of the rotating phosphor wheel in a partially broken state.

  In the phosphor wheel 213 according to the second embodiment, the structure of the disk-shaped member 30 is the same as that of the embodiment, but in the closed space Sp, an annular porous material is projected in the area projected in the rotational axis X direction. Body 201 is arranged. The porous body 201 is formed of, for example, a sintered metal formed by sintering copper, silver or the like, and has a large number of micropores inside. These fine pores are randomly connected to form a gas or liquid passage.

  The porous body 201 is fixed to the first disc portion 30a, and is disposed to face the second disc portion 30b with a gap.

  When the disk-shaped member 30 is rotating about the rotation axis X, the refrigerant 41 in the liquid state is between the second disk portion 30 b and the porous body 201 on the outer peripheral side of the enclosed space Sp due to the centrifugal force of rotation. Enter and distribute in an annular shape. In addition, the refrigerant 41 in the liquid state, which has entered, is adsorbed by the fine pores in the porous body 201, and thereby contacts the first disc portion 30a. The volume of the refrigerant 41 is set such that the entire area of the annular phosphor layer 16 overlaps the area of the liquid refrigerant 41 distributed in an annular shape and the area of the annular porous body 201. .

  When the disk-shaped member 30 is rotating about the rotation axis X, the refrigerant 41 in the liquid state is between the second disk portion 30 b and the porous body 201 on the outer peripheral side of the enclosed space Sp due to the centrifugal force of rotation. enter in. In addition, the refrigerant 41 in the liquid state, which has entered, is adsorbed by the fine pores in the porous body 201, and thereby contacts the first disc portion 30a. When the blue laser light is irradiated to the phosphor layer 16, the phosphor layer 16 generates heat, and this heat is transferred to the refrigerant 41 in the porous body 201 through the first disc portion 30a. When the temperature of the refrigerant 41 becomes equal to or higher than a predetermined temperature, the refrigerant 41 is vaporized. At this time, the first disc portion 30a and the phosphor layer 16 are cooled by the latent heat of vaporization. In that case, in the present embodiment, the refrigerant 41 in the liquid state is held by the fine pores of the porous body 201, so the temperature of the held refrigerant 41 easily rises, and the refrigerant 41 is easily vaporized. That is, the vaporization efficiency is improved. Therefore, the cooling by the latent heat of vaporization of the porous body 201 and the phosphor layer 16 is promoted.

  The vaporized refrigerant moves to the inner peripheral side through the fine pores in the porous body 201, separates from the porous body 201, and further moves to the inner peripheral side in the enclosed space Sp as indicated by the arrow Z1. . The inner peripheral side of the disk-like member 30 is connected to the rotating member 14a of the motor 14 as described above, and the temperature of the disk-shaped member 30 is lower than that of the outer peripheral side. The liquefied refrigerant 41 moves to the outer peripheral side in the enclosed space Sp as indicated by the arrow Z2 by centrifugal force. By continuously performing the vaporization and liquefaction cycle, the phosphor layer 16 is continuously cooled.

  According to the phosphor wheel 213 configured as described above, the amount of the refrigerant 41 stored can be reduced as much as the porous body 201 is provided. Therefore, the inertia at the start of rotation can be reduced, the load on the motor 14 can be reduced, and the motor 14 can be further miniaturized. Further, since the porous body 201 has a gap with the second disc portion 30 b, the refrigerant 41 in a liquid state easily reaches the outer peripheral edge of the disc shaped member 30. When there is no gap, the refrigerant 41 in the liquid state penetrates into the porous body 201 only from its inner peripheral end, so it is difficult for the refrigerant 41 in the liquid state to reach the outer peripheral edge of the discoid member 30. There is a problem that the outer peripheral side is difficult to be cooled.

  On the other hand, in the phosphor wheel 213 in the second embodiment, the phosphor layer 16 has an annular shape centered on the rotation axis X. The closed space Sp is provided in an annular shape around the rotation axis X. The porous body 201 is disposed in a region where the phosphor layer 16 is projected in the rotational axis X direction in the enclosed space Sp. Thereby, the fluorescent substance layer 16 can be cooled appropriately, reducing the quantity of the refrigerant | coolant 41 enclosed in sealed space Sp.

  Further, in the phosphor wheel 213 according to the second embodiment, the discoid member 30 faces the first disc portion 30a having the first surface 13a and the first disc portion 30a with the enclosed space Sp interposed therebetween. And 2 disk portion 30b. The porous body 201 is fixed to the first disc portion 30a, and faces the second disc portion 30b with a gap therebetween. Thereby, it is possible to satisfactorily cool the outer peripheral side of the phosphor layer 16 while arranging the porous body 201.

Third Embodiment
The third embodiment will be described. In the third embodiment, differences from the first embodiment will be mainly described.

  FIG. 15 is a plan view showing the first surface side of the phosphor wheel in the third embodiment in a partially broken state. FIG. 15 is a view showing a phosphor wheel in a rotation stop state.

  In the phosphor wheel 313 according to the third embodiment, a plurality of handle collars 301 are disposed on the outer peripheral portion of the closed space Sp. The handle collar portion 301 is disposed at equal intervals in the circumferential direction, and the refrigerant 41 in a liquid state flows in when the disk-like member 30 rotates, and stores the refrigerant 41 that has flowed in. Specifically, the handle collar portion 301 extends from the outer peripheral surface 30c of the disk-like member 30 radially inward to the inner peripheral side, and from the inner peripheral end of the first wall 301a in the rotational direction (arrow in FIG. And the second wall portion 301 b extending in the circumferential direction). The edges on the first disc portion 30a and the second disc portion 30b side of the first wall portion 301a and the second wall portion 301b are connected to the first disc portion 30a and the second disc portion 30b, respectively. . Further, the tip of the second wall portion 301 b is not connected to the inner peripheral end of the first wall portion 301 a of the adjacent handle portion 301, and an opening portion 301 c is formed. Thereby, the handlebar portion 301 forms a bag-like space having the opening 301c as an inlet. The opening portion 301c functions as an inlet for causing the refrigerant 41 to enter the bag-like space.

  In the rotation stop state shown in FIG. 15, the refrigerant 41 in the liquid state is collected on the lower side in the enclosed space Sp. At this time, the refrigerant 41 in a liquid state has entered into the part of the stem area 301. In addition, FIG. 15 is described as what the rotating shaft is arrange | positioned horizontally as mentioned above.

  Next, the effects of the present embodiment will be described. For comparison, first, the phosphor wheel 13 according to the first embodiment in which the handle portion 301 is not provided will be described.

  FIG. 16 is a diagram for explaining the distribution of the refrigerant at the time of rotation of the phosphor wheel in the first embodiment. (A) of FIG. 16 shows the case where the rotation of the phosphor wheel 13 is stopped, and (b) and (c) of FIG. 16 show that the phosphor wheel 13 starts to rotate and accelerates. FIG. 16 (d) shows when the phosphor wheel 13 is constantly rotating. In addition, the arrow of the rotation direction of (c)-(d) of FIG. 16 is shown by the length according to rotational speed.

  When the phosphor wheel 13 starts to rotate from the state of (a) of FIG. 16 and the rotational speed increases, the refrigerant 41 in the liquid state is centrifugally generated within the enclosed space Sp (b) of FIG. As shown in (c), the particles are dispersed on the side of the outer peripheral surface 30 c of the phosphor wheel 13. Then, when the phosphor wheel 13 is in the steady rotation state, as shown in (d) of FIG. 16, the phosphor wheel 13 is distributed substantially equally on the outer peripheral side of the enclosed space Sp. In that case, when the phosphor wheel 13 starts to rotate, the refrigerant 41 stored in the inside of the closed space Sp is a first disc portion 30a that forms the closed space Sp of the phosphor wheel 13, a second Since it slips with respect to the inner surface of the disk part 30b, the outer peripheral surface part 30c, and the inner peripheral surface part 30d, it will be in the state of (d) of FIG. 16 gradually.

  FIG. 17 is a view for explaining the distribution of the refrigerant 41 at the time of rotation of the phosphor wheel in the third embodiment. (A) to (d) of FIG. 17 show the state from the start of rotation to the steady rotation as described with reference to FIG. In the present embodiment, when the phosphor wheel 313 starts to rotate gently from the rotation stop state of (a) of FIG. 17, the liquid state in the stem area 301 as shown in (b) and (c) of FIG. The refrigerant 41 is pumped up. Therefore, in the state shown in FIG. 17 (d), that is, in the liquid state, at an earlier timing (at a lower rotational speed) than the phosphor wheel 13 according to the first embodiment in which the handle portion 301 is not provided. It can be made to shift to a state where the refrigerant 41 is distributed substantially equally on the outer peripheral side of the enclosed space Sp. Therefore, the phosphor layer 16 can be properly cooled at an earlier timing. Furthermore, the rotation can be stabilized early.

  As described above, in the phosphor wheel 313 according to the third embodiment, the refrigerant 41 in a liquid state flows into the outer peripheral portion of the closed space Sp when the disk-like member 30 rotates, and the handle ridge portion stores the introduced refrigerant 41 301 is provided. Thus, the phosphor layer 16 can be properly cooled at an earlier timing. Therefore, the effect of the first embodiment can be further improved.

  FIG. 18 is a view for explaining a modification of the phosphor wheel in the third embodiment. In the phosphor wheel 313A of the modification, the second wall portion 301b is inclined with respect to the circumferential direction so that the refrigerant 41 in a liquid state can easily enter the inside of the handle portion 301, and the tip side of the second wall portion 301b Is located on the inner circumferential side of the proximal side. As a result, the refrigerant 41 in the liquid state can easily enter during rotation, and the refrigerant 41 in the liquid state can be more quickly shifted to a state in which the refrigerant 41 in the liquid state is substantially evenly distributed on the outer peripheral side of the enclosed space Sp.

Embodiment 4
The fourth embodiment will be described with reference to FIG. The fourth embodiment will be described focusing on differences from the first embodiment.

  FIG. 19 is a plan view showing the first surface side of the phosphor wheel in Embodiment 4 in a partially broken state.

  In the phosphor wheel 413 according to the fourth embodiment, the disk-like member 430 is provided with the ventilation opening 401 penetrating in parallel to the rotation axis X direction while maintaining the hermeticity of the enclosed space Sp. Specifically, the ventilation opening 401 includes an opening 401a formed to face the first disc portion 430a and the second disc portion 430b, and a cylindrical portion 401b connecting the peripheral portions of the opening 401a. Have. The cylindrical portion 401 b is integrally formed with, for example, one of the first disc member 431 and the second disc member 432.

  According to such a configuration, when the phosphor wheel 413 rotates, air can be circulated between the first surface 13 a side of the phosphor wheel 413 and the second surface 13 b side opposite to the first surface 13 a side. Therefore, the phosphor wheel 413 is more likely to be cooled around each ventilation opening 401.

  FIG. 20 is a cross-sectional view schematically showing the vent opening of the phosphor wheel according to a modification of the fourth embodiment. At least one of the first surface 13a of the first disc portion 430a and the second surface of the second disc portion 430b, in the vicinity of the ventilation opening 401, air is rotated to the opening 401a of the ventilation opening 401 when rotating. It is also possible to project and form a protrusion 401 c such as a blade portion to be forced to flow. FIG. 20 (a) shows an example in which the protrusion 401c is formed to protrude on the second surface 13b side, and FIG. 20 (b) shows an example in which the protrusion 401d is formed to protrude on the first surface 13a side. Show. By forming such projections 401c and 401d, the phosphor wheel 413 can be cooled more effectively.

  As described above, in the phosphor wheel 413 according to the fourth embodiment, the disk-shaped member 30 is provided with the ventilation opening 401 penetrating in parallel to the rotation axis X direction while maintaining the hermeticity of the enclosed space Sp. .

  Thereby, the fluorescent substance wheel 413 can be cooled more appropriately, and the effect of Embodiment 1 can be improved more.

(Embodiments 5 to 7)
In Embodiments 1 to 4, the phosphor wheels 13, 213, 313, and 43 in which the annular phosphor layer 16 is provided on the first surface 13a of the first disc portion 30a have been described. However, in the phosphor wheel of the present disclosure, an arc-shaped (fan-shaped) phosphor layer 16 may be provided on one surface (first surface) of the first disc portion, instead of the annular shape. In addition, the disk-like member may be formed of a material other than metal. Hereinafter, an example will be described in the fifth to seventh embodiments.

Fifth Embodiment
The fifth embodiment will be described. The fifth embodiment will be described focusing on differences from the first embodiment.

  FIG. 21 is a plan view showing the first surface side of the phosphor wheel 513 in the fifth embodiment.

  In the fifth embodiment, the first disc portion 530a of the phosphor wheel 513 is formed of metal such as copper as in the first embodiment, but the first disc portion 530a is formed on the entire first surface 13a of the first disc portion 530a. The mirror finish is applied, and the first surface 13a is configured as a mirror that reflects light. Further, on the first surface 13a of the first disk portion 530a, a circular arc-shaped (fan-shaped) phosphor layer 16 centered on the rotation axis X is provided.

  In the phosphor wheel 513 of the present embodiment, among the converted light obtained by wavelength conversion of the blue laser light, the light transmitted through the phosphor layer 16 is also reflected by the first surface 13a of the first disc portion 530a. Then, as shown in FIG. 9 described above, it can be returned to the optical lens 23 side. On the other hand, the blue laser light emitted to the portion (mirror surface) where the phosphor layer 16 is not provided on the first surface 13a of the first disc portion 530a is reflected as it is without wavelength conversion, and the optical lens 23 is Return to the side.

  By applying the same structure as any of the first to third embodiments to the inside of the disc-like member 530 of the phosphor wheel 513, the same effect as the first to third embodiments can be obtained. In addition, the disc-like member 530 may be provided with the ventilation opening as in the fourth embodiment. By providing the vent opening, the same effect as that of the fourth embodiment can be obtained.

Sixth Embodiment
The sixth embodiment will be described. The sixth embodiment will be described focusing on differences from the first embodiment.

  FIG. 22 is a plan view showing the first surface side of the phosphor wheel in the sixth embodiment. FIG. 23 is a cross-sectional view of the phosphor wheel in the sixth embodiment. FIG. 23 is a cross-sectional view of the phosphor wheel 613 in a rotating state, taken along a line 23-23 in FIG.

  In the phosphor wheel 613 according to the present embodiment, the first disc portion 630 a and the second disc portion 630 b of the disc shaped member 630 are formed of a material that transmits light, and the first disc member 631 and the second circle Each plate member 632 is configured. The material that transmits light is, for example, glass. Further, the outer peripheral surface portion 630 c is configured by the outer peripheral spacer member 633, and the inner peripheral surface portion 630 d is configured by the inner peripheral spacer member 634. The outer circumferential spacer member 633 and the inner circumferential spacer member 634 are, for example, ring-shaped members formed of glass. The first disk member 631 and the second disk member 632 are joined with the outer peripheral spacer member 633 and the inner peripheral spacer member 634 interposed therebetween, thereby constituting a phosphor wheel 613 having a sealed space Sp inside. . Then, the refrigerant 41 is sealed in the closed space Sp.

  Further, on the first surface 13a of the first disc portion 630a, a circular arc-shaped phosphor layer 16 around the rotation axis X is formed.

  FIG. 24 is a side view of the phosphor wheel in the sixth embodiment. In the phosphor wheel 613, the blue laser light collected by the first optical lens 25 and irradiated to the phosphor layer 16 is wavelength converted, and then the first disc portion 630a, the refrigerant 41 in the enclosed space Sp, The light passes through the second disc portion 630 b and reaches the second optical lens 26. On the other hand, in the first surface 13a of the first disc portion 630a, the blue laser light emitted to the portion where the phosphor layer 16 is not provided is not wavelength-converted, and the first disc portion 630a and the enclosed space It passes through the refrigerant 41 in the Sp and the second disc portion 630 b and reaches the second optical lens 26. The refrigerant 41 transmits blue laser light for exciting the phosphor layer 16 and light (red, green) excited by the blue laser light. Therefore, the refrigerant 41 is colorless and transparent. For example, water.

  In the present embodiment, the ventilation opening as in the fourth embodiment may be provided in the disc-like member 630 of the phosphor wheel 613. By providing the vent opening, the same effect as in the fourth embodiment can be obtained.

Seventh Embodiment
Seventh Embodiment A seventh embodiment will be described. In the seventh embodiment, differences from the first embodiment will be mainly described.

  FIG. 25 is a plan view showing the first surface side of the phosphor wheel in the seventh embodiment. FIG. 26 is a cross-sectional view of a phosphor wheel in a seventh embodiment. FIG. 26 is a view showing a cross section of the phosphor wheel 713 in a 26-26 cross section of FIG.

  In the present embodiment, the optical system of FIG. 24 is applied. In the phosphor wheel 713 of the present embodiment, the phosphor layer 16 has an arc shape centered on the rotation axis X. The disk-shaped member 730 of the phosphor wheel 713 is a first disk member 731 having a first disk portion 730a, a second disk member 732 having a second disk portion 730b, an outer peripheral surface portion 730c and an inner peripheral surface portion 730d. And consists of. Further, an arc-shaped opening 731a is provided in an arc area where the phosphor layer 16 is not disposed in the first disc portion 730a, and an arc-shaped opening 732a is formed in an area facing the arc-shaped opening 731a in the second disc portion 730b. It is provided. In addition, a light transmitting member 761 formed of a material that transmits blue laser light is provided between the arc-shaped opening 731a and the arc-shaped opening 732a so as to fill a part of the sealed space Sp.

  According to the present embodiment, the blue laser light irradiated to the phosphor layer 16 is wavelength-converted and emitted. On the other hand, the blue laser light emitted to the positions of the arc-shaped openings 731a and 732a of the first surface 13a of the first disc portion 730a passes through the light transmitting member 761 without wavelength conversion, and the second optical The lens 26 is reached. In addition, if the first surface 13a of the first disc portion 730a is configured as a mirror surface (reflection surface), the light transmitted through the phosphor layer 16 in the wavelength-converted blue laser light is made of the first disc portion 730a. It can also be reflected and output by the first surface 13a.

  The same structure as that of the first to third embodiments can be applied to a portion of the disc-like member 730 of the phosphor wheel 713 where the light transmitting member 761 is not provided, and the same effect can be obtained by applying the same. Be Further, the vent holes as in the fourth embodiment may be provided. By providing the vent opening, the same effect as that of the fourth embodiment can be obtained.

Other Embodiments
As mentioned above, although one Embodiment of this indication was described, this indication is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of indication.

(A)
In the above embodiment, the example in which the phosphor wheel of the present disclosure and the light conversion device of the present disclosure are mounted on the three-chip DLP projector 100 including the three DMDs 7 has been described. However, the present disclosure is not limited to this. For example, the phosphor wheel and light conversion device of the present disclosure may be mounted on a one-chip DLP projector in which one DMD and a color wheel are combined.

(B)
In the above embodiment, the example in which the phosphor wheel and the light conversion device of the present disclosure are mounted on the DLP projector 100 has been described. However, the present disclosure is not limited to this. For example, the phosphor wheel and the light conversion device of the present disclosure may be mounted on a liquid crystal projector using an LCD (Liquid Crystal Display) or an LCOS (Liquid Crystal on Silicon).

(C)
In the above embodiment, the phosphor layer 16 is described as being formed of one type of phosphor. However, the present disclosure is not limited to this. The present disclosure is also applicable to a configuration in which the phosphor layer 16 is provided by dividing a plurality of types of phosphor layers in the circumferential direction by a plurality of types of phosphors having different wavelength conversion characteristics. .

(D)
In the above embodiment, the projector 100 has been described as an example of the projection type display device according to the present disclosure. However, the present disclosure is not limited to this. For example, the configuration of the present disclosure may be applied to other projection type display devices such as a rear projection television as well as a projector.

  The phosphor wheel of the present disclosure exerts the effect of being able to improve the cooling effect compared to the prior art, and therefore, a phosphor wheel device equipped with a phosphor wheel in which the heat generated in the phosphor is increased due to high brightness, It can be widely used for conversion devices and projection display devices.

2a, 2b Blue LD (light source)
3a Split mirror (optical parts)
3b, 3c mirror (optical parts)
3d dichroic mirror (optical parts)
3e, 3f, 3g mirror (optical parts)
4a to 4h Lens (optical parts)
5 Rod Integrator (Optical components)
6a TIR (total reflection) prism (optical parts)
6b color prism (optical parts)
7 DMD (display element)
8 Projection lens 10 Phosphor wheel device 11 Case 11a Cover 11aa Opening 11b Outer cylinder 11c Inner cylinder 11d Bottom 11e Airflow rise guide 11g Communication 11h Communication 13 13, 313, 313A, 413, 513, 613 , 713 phosphor wheel 13a first surface 13b second surface 13h center hole 14 motor 14a rotating member 15 pressure fan 16 phosphor layer 20 light conversion device 21 heat absorber 21a fin 21b wall 22 heat sink 22a fin 23 Optical lens 23a Optical lens holding part 24 Heat pipe 25 First optical lens 26 Second optical lens 30, 430, 530, 630, 730 Disc-shaped members 30a, 430a, 530a, 630a, 730a First disc portions 30b, 430b, 630b, 730b 2nd disc part 30c, 630c, 730 Outer peripheral surface 30d, 630d, 730d in the peripheral surface 31,431,631,731 first disk member 32,432,632,732 second disk member 41 refrigerant (liquid state)
201 porous body 301 handle collar portion 301a first wall portion 301b second wall portion 301c opening portion 401 ventilation opening portion 401a opening portion 401b cylindrical portion 633 outer peripheral spacer member 634 inner peripheral spacer member 731a arc opening 732a arc opening 761 light transmission Member Ab Irradiation area Bs Laser light convergence point Sp Sealed space

Claims (16)

A disc-shaped member which is rotated about a rotation axis;
And a phosphor layer disposed on one side of the disc-like member;
The disk-like member has a hollow box structure that forms a closed space,
A refrigerant having a volume smaller than a volume of the sealed space is sealed in the sealed space, the liquid state being vaporized from a liquid state at a predetermined temperature or higher.
Phosphor wheel. The phosphor layer has an annular or arc shape around the rotation axis,
The closed space is an annular space centered on the rotation axis,
When the disk-shaped member rotates around the rotation axis and the refrigerant in the liquid state is distributed in an annular shape on the outer peripheral side in the enclosed space by the centrifugal force of rotation, it is seen in the rotation axis direction The volume of the refrigerant is set such that at least a region of the phosphor layer to be irradiated with the laser light overlaps a distribution region of the refrigerant in a liquid state distributed in the annular shape.
A phosphor wheel according to claim 1. The phosphor layer has an annular or arc shape around the rotation axis,
The closed space is an annular space centered on the rotation axis,
When the disk-shaped member rotates around the rotation axis and the refrigerant in the liquid state is distributed in an annular shape on the outer peripheral side in the enclosed space by the centrifugal force of rotation, it is seen in the rotation axis direction The volume of the refrigerant is set such that the entire area of the phosphor layer overlaps the distribution area of the refrigerant in the liquid state distributed in the annular shape.
A phosphor wheel according to claim 1. The phosphor layer has an annular or arc shape around the rotation axis,
The enclosed space is an annular space around the rotation axis,
In the enclosed space, a porous body is disposed in a region where the phosphor layer is projected in the rotation axis direction.
The phosphor wheel according to any one of claims 1 to 3. The disc-like member has a first disc portion having the one surface, and a second disc portion opposed to the first disc portion across the sealed space.
The porous body is fixed to the first disc portion, and is opposed to the second disc portion via a gap.
The phosphor wheel according to claim 4. In the outer peripheral portion of the sealed space, there is provided a handle collar portion in which the refrigerant in the liquid state flows in at the time of rotation of the disk-shaped member, and the refrigerant flowing therein is stored.
The phosphor wheel according to any one of claims 1 to 5. The disk-like member is provided with a ventilation opening penetrating in parallel to the rotation axis direction while maintaining the hermeticity of the sealed space.
The phosphor wheel according to any one of claims 1 to 6. The entire surface or a part of the one surface is configured as a mirror surface that reflects light,
The phosphor wheel according to any one of claims 1 to 7. The disc-like member has a first disc portion having the one surface, and a second disc portion opposed to the first disc portion across the sealed space.
The first disc portion and the second disc portion are formed of a material that transmits light,
A phosphor wheel according to any one of the preceding claims. The disc-like member has a first disc portion having the one surface, and a second disc portion opposed to the first disc portion across the sealed space.
The first disc portion and the second disc portion are formed of a material that does not transmit light,
The phosphor layer has an arc shape centered on the rotation axis,
An arc-shaped opening is provided in the remaining arc region where the phosphor layer is not disposed in the first disc portion and the region facing the remaining arc region in the second disc portion,
A light transmitting member formed of a material that transmits light is provided at the position of the arc-shaped opening,
A phosphor wheel according to any one of the preceding claims. The predetermined temperature is higher than the temperature of the refrigerant before the phosphor layer is excited by the laser light, and lower than the temperature of the refrigerant after the phosphor layer is excited by the laser light.
The phosphor wheel according to any one of claims 1 to 10. The predetermined temperature is 70 ° C. to 160 ° C.,
A phosphor wheel according to any one of the preceding claims. The enclosed space is 500 hPa to 2000 hPa,
A phosphor wheel according to any one of the preceding claims. The refrigerant transmits laser light for exciting the phosphor layer and light excited by the laser light.
The phosphor wheel according to claim 9. The refrigerant is water,
The phosphor wheel according to claim 14. The phosphor wheel according to any one of claims 1 to 15,
And a light source for emitting light for exciting the phosphor layer of the phosphor wheel.

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