JP2017173798A - Phosphor wheel device and projection display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a phosphor wheel device provided with a substrate having a well-balanced rotation while maintaining heat dissipation. A phosphor wheel device comprising a phosphor and a disk-shaped substrate provided with the phosphor, wherein the phosphor is at least on the circumference of the substrate about the axis of rotation of the substrate. It is provided in part. The substrate includes a first opening and a plurality of second openings, and the plurality of second openings are provided radially about the axis of rotation. [Selection diagram] FIG. 2A

Description

  The present disclosure relates to a phosphor wheel device and a projection display apparatus using the phosphor wheel device.

  Conventionally, in order to balance the rotation of the substrate of the phosphor wheel device, there is a technique of providing a notch in a part of the substrate. Patent Document 1 discloses a technique for reducing the intensity of excitation light applied to a phosphor on a substrate in order to suppress a decrease in heat dissipation of the substrate caused by providing a notch.

JP2013-41170A

  The present disclosure provides a phosphor wheel device including a substrate that is rotationally balanced while maintaining heat dissipation.

  The present disclosure is a phosphor wheel device including a phosphor and a disk-shaped substrate provided with the phosphor, and the phosphor is at least on a circumference of the substrate centering on the rotation axis of the substrate. It is provided in a part. The substrate includes a first opening and a plurality of second openings, and the plurality of second openings are provided radially about the rotation axis.

  The present disclosure provides a phosphor wheel device including a substrate that is rotationally balanced while maintaining heat dissipation.

FIG. 1 is a diagram showing an optical configuration of the projection display apparatus according to the first embodiment. FIG. 2A is a plan view showing the configuration of the phosphor wheel device according to the first exemplary embodiment. 2B is a side view showing the configuration of the phosphor wheel device according to Embodiment 1. FIG. FIG. 3 is an enlarged perspective view of one balancing opening in the first embodiment. FIG. 4 is an enlarged view of a portion corresponding to part A in FIG. 2A. FIG. 5 is a diagram showing temperature measurement points of the phosphor on the substrate to be compared. FIG. 6 is a diagram showing temperature measurement points of the phosphor on the substrate in the first embodiment. FIG. 7 is a diagram showing the result of simulating the temperature change of the phosphor due to the shape of the balance opening. FIG. 8 is a diagram showing the result of simulating the temperature change of the phosphor due to the fluid when the substrate is rotated. FIG. 9A is a diagram showing the result of adding the results shown in FIG. 7 and FIG. FIG. 9B is a diagram showing simulation conditions. FIG. 10A is a diagram illustrating a simulation result of a flow velocity distribution when a comparison target substrate is rotated. FIG. 10B is a diagram showing a simulation result of the flow velocity distribution when the substrate is rotated in the first embodiment. FIG. 11 is an enlarged perspective view of one balancing opening in the second embodiment. FIG. 12 is an enlarged view of a portion corresponding to part A of FIG. 2A of the substrate in the second embodiment.

  Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings. However, more detailed description than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid the following description from becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

  The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

(Embodiment 1)
Hereinafter, Embodiment 1 will be described with reference to FIGS.

[Optical configuration of the projection display]
FIG. 1 is a diagram showing an optical configuration of a projection display apparatus 1 according to the first embodiment. In this example, the projection display apparatus 1 is a projector.

  The projection display apparatus 1 includes an illumination device 10, an image generation unit 90, and a projection lens 98 that projects image light generated by the image generation unit 90 onto a screen (not shown).

  The illumination device 10 emits light with uniform illuminance and substantially parallel light to the image generation unit 90. Details of the illumination device 10 will be described later.

  The video generation unit 90 includes a lens 92, a total reflection prism 94, and a single DMD (Digital Mirror Device) 96. The lens 92 has a function of imaging light emitted from the illumination device 10 on the DMD 96. Specifically, the light incident on the total reflection prism 94 through the lens 92 is reflected by the surface 94 a and guided to the DMD 96. The DMD 96 is provided with a plurality of mirrors on the base. The DMD 96 controls each of the plurality of mirrors on (ON) and off (OFF) by a control unit (not shown) according to the timing of each color light incident on each of the plurality of mirrors and the video signal input to the control unit. Then, the video signal is modulated. Here, the on-controlled state is a state in which the plurality of mirrors reflect light incident from the light source toward the incident port 98 a of the projection lens 98. In addition, the off-controlled state is a state in which the plurality of mirrors reflect light incident from the light source in a direction other than the incident port 98a of the projection lens 98. The light (image light) modulated and emitted by the DMD 96 is transmitted through the total reflection prism 94 and guided to the entrance 98 a of the projection lens 98. In the first embodiment, a DMD having a diagonal size of, for example, 0.67 inches is used as the DMD 96. The DMD 96 is an example of a light modulation element.

  The projection lens 98 projects the temporally synthesized image light incident on the incident port 98a onto a screen (not shown) outside the projection display apparatus 1. The F number of the projection lens 98 is 1.7, for example. The projection lens 98 is an example of a projection optical system.

[Configuration of lighting device]
As illustrated in FIG. 1, the illumination device 10 includes a light source device 12 and a light guide optical system 70 that guides the emitted light from the light source device 12 to the video generation unit 90.

  The first laser module 20 arranged in a 5 × 5 matrix includes a semiconductor laser element 22 and a collimating lens 24. The second laser module 26 arranged in a 5 × 5 matrix includes a semiconductor laser element 28 and a collimating lens 30. The semiconductor laser elements 22 and 28 emit blue laser light having a wavelength of 450 nm. The collimating lenses 24 and 30 are provided in each of the semiconductor laser elements 22 and 28 and function to condense blue laser light emitted from the semiconductor laser elements 22 and 28 with a divergence angle into parallel light beams. have. The first laser module 20 and the second laser module 26 are examples of light sources.

  The blue laser light emitted from the semiconductor laser elements 22 and 28 is spatially synthesized by the mirror 32. Here, the arrangement of the laser modules 20 and 26 is adjusted at equal intervals so that the blue laser light emitted from the semiconductor laser elements 22 and 28 is incident on different positions on the mirror 32. In addition, the mirror 32 is provided with an AR (Anti-Reflection) coating that is highly transmissive to the blue laser light in the region where the blue laser light from the first laser module 20 is incident. Further, the mirror 32 is provided with a mirror coating that is highly reflective to the blue laser light in the region where the blue laser light from the second laser module 26 is incident.

  The blue laser light synthesized by the mirror 32 is condensed and superimposed by the lens 34. The blue laser light condensed and superimposed by the lens 34 passes through the lens 36 and the diffusion plate 38 before entering the dichroic mirror 40. The lens 36 has a function of returning the blue laser light condensed and superimposed by the lens 34 to a parallel light beam again. The diffusion plate 38 has a function of reducing the coherence of the blue laser light condensed and superimposed by the lens 34 and adjusting the condensing property of the laser light.

  The dichroic mirror 40 is a color synthesizing element having a cutoff wavelength set to about 480 nm. Therefore, the blue laser light that has been made substantially parallel by the lens 36 is reflected by the dichroic mirror 40, condensed by the condenser lenses 42 and 44, and irradiated onto the phosphor wheel device 100.

  FIG. 2A is a plan view showing a configuration of phosphor wheel device 100 in the first exemplary embodiment. FIG. 2B is a side view showing the configuration of phosphor wheel device 100 in the first exemplary embodiment.

  The phosphor wheel device 100 is rotationally controlled in correspondence with a period of one frame (for example, 1/60 second) of a projected image. As shown in FIG. 2A, with respect to the green phosphor segment 105, the red phosphor segment 106, and the laser light transmitting opening 107 provided on the substrate 101 along the rotation direction (circumferential direction), the substrate The blue laser light is irradiated sequentially in time by the rotation of 101.

  The blue laser light, which is the excitation light, that irradiates the phosphor region of the phosphor wheel device 100 excites the phosphors of the green phosphor segment 105 and the red phosphor segment 106 at the irradiated fluorescence spot. Here, the phosphor region refers to a region where the phosphors of the green phosphor segment 105 and the red phosphor segment 106 are provided. The excited phosphor of the green phosphor segment 105 and the phosphor of the red phosphor segment 106 emit green light and red light toward the condenser lens 44. These green light and red light are converted into substantially parallel light by the condenser lenses 44 and 42 and pass through the dichroic mirror 40.

  On the other hand, the blue laser light transmitted through the laser light transmitting opening 107 is condensed by the condensing lenses 42 and 44, but is again converted into substantially parallel light by the lenses 46 and 48. The substantially parallel blue laser light is returned to the dichroic mirror 40 again by the mirrors 50, 52, and 58 disposed in the optical path. Furthermore, a lens 54 for relaying the extended optical path and a diffuser plate 56 for further reducing the coherence of the blue laser light are arranged in the optical path.

  The blue laser light that has passed through the phosphor wheel device 100 and has been relayed through the optical path and returned to the dichroic mirror 40 is reflected by the dichroic mirror 40 toward the lens 60. In this way, the light (blue laser light) transmitted through the phosphor wheel device 100 and the emitted light (green light and red light) are spatially combined by the dichroic mirror 40.

  The light spatially synthesized by the dichroic mirror 40 is collected by the lens 60 and becomes emitted light from the light source device 12.

  Light emitted from the light source device 12 enters the rod integrator 72. The rod integrator 72 includes an entrance surface 72a and an exit surface 72b. The light emitted from the light source device 12 that has entered the incident surface 72a of the rod integrator 72 has a more uniform illuminance within the rod integrator 72 and is emitted from the output surface 72b. The light emitted from the emission surface 72 b is made into substantially parallel light by the lenses 74 and 76 and is emitted from the illumination device 10 to the video generation unit 90.

[Operation of projection display device]
The operation of the projection display apparatus 1 configured as described above will be described below.

  In the projection display apparatus 1, the illumination device 10 emits light of three colors, red light, green light, and blue light, which are switched over time. The video generation unit 90 generates video light from the light emitted from the lighting device 10. The projection lens 98 enlarges and projects the image light generated by the image generation unit 90 incident on the incident port 98a onto the screen. The control unit (not shown) controls the DMD 96 of the video generation unit 90 and the phosphor wheel device 100 of the illumination device 10 in synchronization. The control unit controls the DMD 96 so as to generate video light corresponding to each color light based on the input video signal. Thereby, the image light of each color is projected onto the screen in a time division manner. The user visually recognizes the image light projected on the screen as an image by continuously viewing the image light.

[Configuration of phosphor wheel device]
Details of the configuration of the phosphor wheel device 100 will be described with reference to FIGS. 2A to 4.

  The phosphor wheel device 100 includes a disk-shaped aluminum substrate 101. A mounting hole 102 is provided at the center C of the substrate 101. A rotation shaft 104 of a motor 103 is attached to the attachment hole 102, and the substrate 101 is rotationally driven by the motor 103. On one surface of the substrate 101 of the phosphor wheel device 100, a green phosphor segment 105, a red phosphor segment 106, and a laser beam transmitting opening 107 are provided on the same circumference of the substrate 101 at an angle of 120 °. It has been. The substrate 101 is further provided with a plurality of balance openings 108 on the inner side of the circumference where the green phosphor segment 105, the red phosphor segment 106, and the laser light transmission opening 107 are provided. Here, the laser light transmitting opening 107 is an example of a first opening, and the balancing opening 108 is an example of a second opening.

  The balance opening 108 is provided to balance the rotation of the substrate 101. The substrate 101 is rotationally balanced at the time when the mounting hole 102 is provided at the center in the manufacturing process. However, when the laser beam transmitting opening 107 is provided in the substrate 101, the weight balance is greatly lost, and the rotation balance cannot be achieved. Also, when a phosphor is formed on the substrate 101, the rotational balance is affected by the weight of the phosphor. The balancing opening 108 is provided in order to eliminate such unbalance when the substrate 101 rotates.

  In the first embodiment, a plurality of balance openings 108 are provided, and specifically nine are provided. The balance opening 108 is a long hole extending in the radial direction from the center C of the disk-shaped substrate 101. Furthermore, specifically, the shape of the long hole is an elongated drop shape (water droplet shape) whose width increases as it extends in the radial direction from the center C of the disk-shaped substrate 101.

  As can be seen from FIG. 2A, the plurality of balance openings 108 are provided on the substrate 101 inside the circumference where the laser light transmission openings 107, the green phosphor segments 105, and the red phosphor segments 106 are provided. It has been. The plurality of balance openings 108 are provided close to each other in a region facing the laser light transmission opening 107 with the rotation shaft 104 interposed therebetween.

  FIG. 3 is an enlarged perspective view of one balancing opening 108 in the first embodiment. FIG. 4 is an enlarged view of a portion corresponding to part A in FIG. 2A.

  Since the phosphor excited by the blue laser light generates heat when it emits light, the substrate 101 is made of aluminum or the like having excellent heat dissipation. Here, if the substrate 101 is provided with a balance opening having a large opening area with respect to the thickness of the substrate 101, the heat radiation area (surface area) of the substrate 101 is reduced and the heat radiation effect is lowered. However, in the first embodiment, even if the balance opening 108 is provided, a decrease in the heat dissipation effect can be suppressed. That is, the shape of the balance opening 108 is optimized to suppress a decrease in the heat dissipation effect of the substrate 101.

  Here, the area of the opening inner surface 108a (hatched portion) of the balance opening 108 as shown in FIG. 3 is defined as area S1, and the opening end face 108b (hatching) of the balance opening 108 as shown in FIG. The area of the portion subjected to () is defined as area S2. In this case, in order to achieve the above object, it is desirable to make S1 as close to S2 as possible, that is, the area S1 is 90% or more of the area S2 (S1≈S2). As a result of the experiment, it was confirmed that if the area S1 is 70% or more of the area S2, a desired heat dissipation effect can be obtained.

  In the first embodiment, since nine balancing openings 108 having the same shape and the same dimensions are provided, the total area S1 (S1 × 9) is 70% or more of the total area S2 (S2 × 9). The dimension of the balance opening 108 is determined so as to be preferably 90% or more.

  Usually, since the thickness of the substrate is about 1 mm, the heat radiation area can be easily secured on the inner surface of the opening by using the opening having the shape as in the first embodiment.

[effect]
The effects of the first embodiment will be described below with reference to FIGS. FIG. 5 is a diagram showing temperature measurement points of the phosphor provided on the substrate 111 to be compared. FIG. 6 is a diagram showing temperature measurement points of the phosphor provided on the substrate 101 in the first embodiment. As shown in FIG. 5, a substrate 111 provided with one fan-shaped large balance opening 118 is used as a comparison object of the first embodiment. A mounting hole 112 is provided in the center C of the substrate 111. On one surface of the substrate 111, a green phosphor segment 115, a red phosphor segment 116, and a laser beam transmitting opening 117 are provided at an angle of 120 ° on the same circumference of the substrate 111. The substrate 111 is further provided with one large fan-shaped balance opening 118 inside the circumference where the green phosphor segment 115, the red phosphor segment 116, and the laser light transmitting opening 117 are provided. It has been.

  In addition, in the substrate 101 of the first embodiment in which this effect has been confirmed, the sum of the areas S1 of the opening inner surfaces 108a of the balance openings 108 is approximately the sum of the areas S2 of the opening end surfaces 108b of the balance openings 108. The sum of the area S1 of the opening inner surface 108a of the balance opening 108 and the sum of the area S2 of the opening end face 108b of the balance opening are made substantially equal to 99%.

(Heat dissipation effect)
The temperature of the phosphor applied to the substrates 101 and 111 shown in FIGS. 5 and 6 is simulated. As shown in FIGS. 5 and 6, five angle points of 0 °, 45 °, 90 °, 135 °, and 180 ° in the phosphor region were set as temperature measurement points. The temperature measurement simulation of the phosphor was performed at these five angle points.

  The simulation method is shown below.

  First, with the substrates 101 and 111 shown in FIGS. 5 and 6 stationary, the laser beam spot is rotated at the rotation speed of the substrates 101 and 111 and the phosphor 101 is irradiated as a result. Heat up to watts).

  FIG. 7 is a diagram showing the result of simulating the temperature change of the phosphor due to the shape of the balance openings 108 and 118. FIG. In FIG. 7, the temperature of the phosphor is measured at each temperature measurement point, and the temperature of the phosphor at the 0 ° point and the 180 ° point is set as a reference temperature. It shows how changes occur. In the graph of FIG. 7, the temperature rises at about 90 ° because the heat dissipation effect of the substrates 101 and 111 in the vicinity thereof decreases due to the presence of the openings 108 and 118.

  Next, when the substrates 101 and 111 shown in FIGS. 5 and 6 are rotated in the direction of arrow A, a fluid flow is generated in a direction opposite to the rotation direction of the substrates 101 and 111 (broken arrow direction). At this time, when the substrates 101 and 111 are stopped and the flow of the fluid is observed, air as the fluid flows in a direction from 0 ° to 180 °. In this case, the temperature of the air rises due to heat generated from the phosphors on the substrates 101 and 111. FIG. 8 is a diagram showing the result of simulating the temperature change of the phosphor due to the fluid when the substrates 101 and 111 are rotated. As shown in FIG. 8, the temperature of the phosphor gradually increases from the 0 ° point toward the 180 ° point. This is because the air temperature at the 0 ° point far from the balance openings 108 and 118 is low, but the air temperature increases from the 0 ° point to the 180 ° point, and the cooling effect by the air decreases. Because.

  FIG. 9A is a diagram illustrating a result obtained by adding the results illustrated in FIGS. 7 and 8. FIG. 9B is a diagram illustrating simulation conditions. As can be seen from FIG. 9A, the temperature of the phosphor is lower by 5 ° C. or more in the substrate 101 of the first embodiment than in the substrate 111 to be compared.

(Noise reduction effect)
In the comparison target substrate 111 having one balance opening 118 and the substrate 101 of the first embodiment having a plurality of balance openings 108, the substrate 101 having a plurality of balance openings 108 is more preferable. The experimental result that the noise at the time of rotation was small was obtained. In order to analyze the cause, fluid distribution simulation was performed when the substrates 101 and 111 were rotated in air at a rotation speed of 10800 rpm, and the pressure at the open end P was calculated.

  FIG. 10A is a diagram illustrating a simulation result of a flow velocity distribution when the substrate 111 to be compared is rotated. FIG. 10B is a diagram illustrating a simulation result of a flow velocity distribution when the substrate 101 in Embodiment 1 is rotated. Here, the opening end P is the leftmost opening of the balancing openings 108 and 118 as shown in FIGS. 10A and 10B. In general, the magnitude of noise when the substrates 101 and 111 rotate depends on the magnitude of the pressure at the open end P. That is, it can be said that the noise increases as the pressure at the opening end P increases.

  As a result of the simulation, the pressure at the opening end P of the balancing opening 108 in the substrate 101 of the first embodiment is 58.9 Pa (Pascal), and the pressure at the opening end P of the balancing opening 118 in the substrate 111 to be compared. Was 105.0 Pa. From this, it was confirmed that the substrate 101 of the first embodiment having the plurality of balance openings 108 has a lower pressure at the opening end P, that is, noise is lower.

  When the substrate is rotated in the air at a rotation speed of 10800 rpm, the air around the substrates 101 and 111 has a flow velocity distribution as shown in FIGS. 10A and 10B in the simulation. Here, the length of the arrow (vector) indicates the magnitude of the flow velocity. That is, if the length of the arrow is long, the flow rate is large, and if the length of the arrow is short, the flow rate is small. In the case of the substrate 111 to be compared, the flow velocity at the center of the balance opening 118 is small, but the flow velocity at the opening end P is large. On the other hand, in the case of the substrate 101 of the first embodiment, the flow velocity around the balance opening 108 is uniformly distributed.

  That is, the inner surface of the balance opening 118 collides with the substrate 111 to be compared toward the surrounding air. On the other hand, in the case of the substrate 101 according to the first embodiment, the surrounding air moves together with the balance opening 108, so that the air does not collide with the inner surface 108a of the opening. As a result, when the balance opening 108 is a plurality of long hole openings, noise can be suppressed.

(Embodiment 2)
Hereinafter, the second embodiment will be described with reference to FIGS. 11 and 12. The description of the same configuration as that of the first embodiment will be omitted, and only different points will be described.

  FIG. 11 is an enlarged perspective view of one balancing opening 128 in the second embodiment. FIG. 12 is an enlarged view of a portion corresponding to part A of FIG. 2A of the substrate 121 in the second embodiment. As shown in FIGS. 11 and 12, each of the balancing openings 128 is circular, and the openings are arranged to form a plurality of rows extending in the radial direction about the rotation shaft 104. In each of the rows, the diameter of the opening increases as the outer edge of the substrate 121 is approached.

  Here, a specific example of the arrangement state is a state in which the centers of the openings forming each row are aligned on a straight line, but is not limited thereto.

  Further, in order to suppress a decrease in the heat dissipation effect of the substrate 121, the total area of the opening inner surface 128a of the balancing opening 128 is 90% or more of the total area of the opening end face 128b of the balancing opening 128. It is desirable to be. Furthermore, if the total area of the opening inner surface 128a of the balance opening 128 is 70% or more of the total area of the opening end face 128b of the balance opening 128, a desired heat dissipation effect can be obtained.

(Other embodiments)
As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to embodiments that have been changed, replaced, added, omitted, and the like. Moreover, it is also possible to combine each component demonstrated in the said embodiment and it can also be set as a new embodiment.

  Therefore, other embodiments will be exemplified below.

  In the above embodiment, the laser modules 20 and 26 constituted by the semiconductor laser elements 22 and 28 arranged in a 5 × 5 matrix form are exemplified in the light source unit. However, the number and arrangement of the semiconductor laser elements are not limited thereto. It is not limited, and may be set as appropriate according to the light intensity per semiconductor laser element, the output desired for the light source device, and the like. Further, the wavelength of the laser light is not limited to 450 nm. For example, a violet semiconductor laser element that outputs light of 405 nm, a semiconductor laser element that outputs ultraviolet light of 400 nm or less, and the like may be used.

  In the above embodiment, the cerium-activated garnet structure phosphor is excited by the blue laser light, and the light having the main wavelengths of red and green is emitted. However, yellow or blue-green is the main wavelength. A phosphor that emits light may be used.

  In addition, a yellow phosphor segment may be provided instead of the red phosphor segment of the embodiment, and a color filter may be provided in the subsequent stage to extract red.

  In the above embodiment, the first opening is an opening having a peripheral edge, but may be a notch-shaped opening.

  The present disclosure can be applied to a projection display apparatus using a phosphor wheel device.

DESCRIPTION OF SYMBOLS 1 Projection type image display apparatus 10 Illumination apparatus 12 Light source apparatus 20, 26 Laser module 22, 28 Semiconductor laser element 24, 30 Collimating lens 34, 36, 46, 54, 60, 74, 92 Lens 32, 50 Mirror 38, 56 Diffusion Plate 40 Dichroic mirror 42, 44 Condenser lens 70 Light guide optical system 72 Rod integrator 90 Image generator 94 Total reflection prism 94a Surface 96 DMD
98 Projection lens 98a Entrance 100 Phosphor wheel device 101, 111, 121 Substrate 102, 112 Mounting hole 103 Motor 104 Rotating shaft 105, 115 Green phosphor segment 106, 116 Red phosphor segment 107, 117 Opening for laser beam transmission 108, 118, 128 Balancing opening 108a, 128a Opening inner surface 108b, 128b Opening end surface

Claims (8)

A phosphor,
A disk-shaped substrate provided with the phosphor, and a phosphor wheel device comprising:
The phosphor is provided on at least a part of a circumference of the substrate around the rotation axis of the substrate,
The substrate includes a first opening and a plurality of second openings,
The phosphor wheel device, wherein the plurality of second openings are provided radially about the rotation axis.   2. The phosphor wheel device according to claim 1, wherein each of the second openings is a long hole extending in a radial direction around the rotation axis.   3. The phosphor wheel device according to claim 2, wherein each of the second openings has an elongated drop shape whose width increases as it extends in the radial direction.   2. The phosphor wheel device according to claim 1, wherein each of the second openings is circular, and the openings are arranged to form a plurality of rows extending in a radial direction around the rotation axis. .   5. The phosphor wheel device according to claim 4, wherein in each of the rows, the diameter of the second opening portion increases as the outer edge of the substrate is approached.   The plurality of second openings are regions inside the circumference of the substrate where the first openings and the phosphors are provided, and the first openings across the rotation axis. The phosphor wheel device according to claim 1, wherein the phosphor wheel device is provided adjacent to each other in a region facing the opening.   2. The phosphor wheel device according to claim 1, wherein the plurality of second openings have a total area of the inner surface of the opening that is 70% or more of a total area of the opening end faces. The phosphor wheel device according to claim 1;
A light source for illuminating the phosphor and the first opening;
A light modulation element that modulates light obtained from the phosphor wheel device according to a video signal and emits video light; and
A projection optical system for enlarging and projecting image light emitted from the light modulation element,
Projection display device.

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