JP2018084682A - Phosphor base plate, phosphor wheel, light source device, and projection-type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum base plate capable of reducing deformation of a phosphor base plate which is generated from a difference in linear expansion coefficient of a fluorescent body ring, and a phosphor wheel, a light source device, and a projection-type image display device.SOLUTION: A phosphor base plate 1 includes: a disk-shaped aluminum base plate 103 which has a thermosetting adhesive layer 102 formed in a circumferential direction on one side; and a fluorescent body ring 101 which bonded on the adhesion layer being disposed thereon. The phosphor base plate has at least two ridges 104 which are formed on the other side of the aluminum base plate at positions different from each other in a radial direction in a circumferential direction of the metal substrate.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a phosphor substrate constituting a phosphor wheel used in, for example, a light source device of a projection display apparatus.

  Patent Document 1 discloses a configuration of a phosphor wheel in which a titanium oxide layer is provided on a substrate and a phosphor layer is provided thereon. Such a phosphor wheel is a fluorescent light having an excitation light source, a fluorescent light emitting part disposed opposite to the excitation light source, and a reflective part having titanium oxide disposed on the opposite side of the excitation light source and joined to the fluorescent light emitting part. A light emitting plate is provided. As a result, the excitation light from the excitation light source is irradiated onto the fluorescent light emitting unit, so that the fluorescent light emitted from the fluorescent light emitting unit and the fluorescent reflected light from the reflecting unit can be emitted. Therefore, the reflectance of fluorescent light can be improved to improve the utilization efficiency of the reflected light, and the cost can be reduced.

JP 2013-228598 A

  The present disclosure provides a phosphor substrate in which deformation due to temperature change is suppressed.

  A phosphor substrate in the present disclosure includes a disk-shaped metal substrate, a phosphor layer provided on one surface of the metal substrate in a circumferential direction, and an adhesive layer that bonds the phosphor layer to the metal substrate. On the other surface, at least two protrusions are provided at different positions in the radial direction in the circumferential direction of the metal substrate.

  By setting it as the said structure, the phosphor substrate which can suppress the deformation | transformation at the time of the temperature of a phosphor substrate changing can be provided.

The figure which shows the structure of the fluorescent substance substrate of Embodiment 1. The figure which shows the structural example of a fluorescent substance substrate The figure which shows the light source device using the fluorescent substance substrate of Embodiment 1. The figure which shows the projection type video display apparatus carrying the light source device which uses the fluorescent substance substrate of Embodiment 1. The figure which shows the structure of the fluorescent substance substrate of Embodiment 2. The figure which shows the light source device using the fluorescent substance substrate of Embodiment 2. The figure which shows the projection type video display apparatus carrying the light source device using the fluorescent substance substrate of Embodiment 2.

  Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of 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)
[1-1] Configuration of Phosphor Substrate The configuration of the phosphor substrate according to the first embodiment will be described with reference to FIG.

  1A and 1B are diagrams showing the configuration of the phosphor substrate 1 according to the first embodiment. FIG. 1A is a plan view, FIG. 1B is a back view, and FIG. FIG. 1D is a cross-sectional view.

  The phosphor substrate 1 includes a disk-shaped substrate 103 made of aluminum, and an attachment hole 105 is provided at the center of which a rotation shaft of a motor 151 (see FIG. 3) is attached. By attaching the motor 151 to the phosphor substrate 1, the phosphor wheel 100 is configured, and the phosphor substrate 1 is rotationally driven by the motor 151. Further, at least one surface of the substrate 103 is provided with an increased reflection film layer 131 provided with an undercoat and a topcoat (not shown) in order to improve surface reflectance. Here, the substrate 103 made of aluminum is an example of a metal substrate.

  An adhesive layer 102 having a constant width and thickness in the form of a ring is formed on the circumference of the increased reflection film layer 131 of the substrate 103 on the circumference having the same distance from the rotation center of the substrate 103 as shown in FIG. Is done.

  Next, details of the phosphor substrate 1 will be described with reference to FIG.

  The adhesive layer 102 provided on the increased reflection film layer 131 of the substrate 103 is configured by containing contained particles 121 that increase reflectance and thermal conductivity in a thermosetting resin silicone 122.

  The phosphor ring 101 is composed of a mixture of phosphor 111 and alumina 112, and is formed by sintering into a ring shape having a certain width and thickness. The phosphor ring 101 is an example of a phosphor layer. Thus, the phosphor layer is provided on the one surface of the phosphor substrate 1 in the circumferential direction.

  The material used for the adhesive layer 102 is a thermosetting type in order to buffer the distortion caused by the difference in thermal expansion coefficient between the substrate 103 and the phosphor ring 101 constituting the phosphor layer, and to maintain the phosphor wheel configuration. It is desirable to use the resin silicone. In addition, it is desirable to use a dimethyl-based thermosetting resin silicone as the resin silicone used for the adhesive layer from the property of buffering strain.

  Then, the back surface of the fluorescent substance substrate 1 is demonstrated using FIG.1 (b).

  On the side (back surface) of the substrate 103 where the increased reflection film layer 131 is not provided, the protrusions 104 each having a certain width and thickness are formed in a ring shape on two circumferences having different distances from the rotation center of the substrate 103. Is formed. The protruding portion 104 can be provided by removing a portion other than the protruding portion by etching a substrate thicker than the substrate 103 before processing.

  In the embodiment, the two protrusions are arranged at positions that sandwich the width direction of the adhesive layer.

  As a method of providing the two protrusions 104 at different positions in the radial direction in the circumferential direction of the substrate 103 as described above, the protrusions 104 are provided by machining such as cutting in addition to processing by etching. It may be. In the present embodiment, two ridges are provided, but three or more ridges may be provided.

[1-2] Effects First, the configuration of a general phosphor substrate will be described with reference to FIG.

  2, FIG. 2 (a) is a plan view, FIG. 2 (b) is a back view, FIG. 2 (c) is an essential part sectional view, and FIG. 2 (d) is a sectional view.

  The phosphor substrate 2 includes a disk-shaped substrate 203 made of aluminum, and an attachment hole 205 is provided at the center of which the rotation shaft of the motor is attached. By attaching a motor to the phosphor substrate 2, it is configured as a phosphor wheel, and the phosphor substrate 2 is rotationally driven by the motor. Further, at least one surface of the substrate 203 is provided with an increased reflection film layer 231 provided with an undercoat and a topcoat (not shown) in order to improve the surface reflectance. Here, the substrate 203 made of aluminum is an example of a metal substrate.

  On the increased reflection film layer 231 of the substrate 203, as shown in FIG. 2A, an adhesive layer 202 having a constant width and thickness is formed in a ring shape on the circumference having the same distance from the rotation center of the substrate 203. Is done.

  Next, details of the phosphor substrate 2 will be described with reference to FIG.

  The adhesive layer 202 provided on the increased reflection film layer 231 of the substrate 203 is configured by containing contained particles 221 that increase reflectance and thermal conductivity in a thermosetting resin silicone 222.

  The phosphor ring 201 is composed of a mixture of the phosphor 211 and alumina 212, and is formed by sintering into a ring shape having a certain width and thickness. The phosphor ring 201 is an example of a phosphor layer.

  The material used for the adhesive layer 202 is a thermosetting type in order to buffer the distortion caused by the difference in thermal expansion coefficient between the substrate 203 and the phosphor ring 201 constituting the phosphor layer and to maintain the phosphor wheel configuration. Resin silicone is used. In addition, dimethyl-based thermosetting resin silicone is used as the resin silicone used for the adhesive layer because of the property of buffering strain.

  Subsequently, the back surface of the phosphor substrate 2 will be described with reference to FIG.

  The back surface of the substrate 203 is a flat surface. A change in the shape of the phosphor substrate 2 that occurs when the adhesive layer is cured and during actual use due to such a shape will be described with reference to FIG.

  That is, when the adhesive layer is thermally cured, deformation occurs due to the temperature of the phosphor substrate 2 due to a difference in linear expansion coefficient between the substrate 203 and the phosphor ring 201. For this reason, when the phosphor substrate is adhered so as to be flat when the adhesive layer is cured at a high temperature, the phosphor ring 201 is adhered as shown in FIG. It is deformed so that the other side is convex upward.

  As described above, when the shape of the substrate 203 is deformed depending on the temperature, the position of the phosphor ring 201 is changed if the conditions for adjustment and alignment are different from the actual use conditions, which causes a problem of deviation. To do.

  On the other hand, in this embodiment, by providing the protrusion 104 as shown in FIGS. 1B, 1C, and 1D, the deformation of the substrate 103 is suppressed, and the structure shown in FIG. As shown, the shape of the phosphor substrate 1 does not deform even when used at room temperature.

[1-3] Light Source Device Using Phosphor Substrate of Embodiment 1 Details of the light source device 3 using the phosphor wheel 100 using the phosphor substrate 1 of Embodiment 1 will be described with reference to FIG. To do.

  First, the phosphor wheel 100 includes the phosphor substrate 1 and a motor 151 that rotationally drives the phosphor substrate 1.

  Light emitted from the plurality of first semiconductor lasers 302 is converted into parallel light by a collimator lens 303 disposed on each emission side of the first semiconductor laser 302. On the emission side of the collimator lens 303, a convex lens 304 that reduces the beam width by collecting the light of the first semiconductor lasers 302 emitted from the plurality of collimator lenses 303 is provided. The outgoing light whose beam width is reduced by the convex lens 304 is incident on the diffusion plate 305 located on the outgoing side of the convex lens 304. The diffusing plate 305 eliminates the density of the light flux generated in the state where the light emitted from the first semiconductor laser 302 passes through the collimator lens 303 that could not be eliminated by the convex lens 304. Here, the first semiconductor laser 302 is an example of an excitation light source.

  Light emitted from the diffusion plate 305 enters the concave lens 306. The concave lens 306 converts the light incident from the diffusion plate 305 into parallel light.

  The collimated light emitted from the concave lens 306 is incident on a dichroic mirror 307 disposed on the exit side at an angle of 45 degrees with respect to the optical axis. The dichroic mirror 307 has a characteristic of transmitting light in the wavelength region of light emitted from the first semiconductor laser 302 and reflecting light in the wavelength region of fluorescence from the phosphor wheel 100 described later. Therefore, the light from the concave lens 306 that has entered the dichroic mirror 307 is transmitted, and is incident on the plurality of convex lenses 308 and 309 in order, so that the light beam is converged and enters the phosphor wheel 100.

  The phosphor wheel 100 is disposed so that the phosphor ring 101 constituting the phosphor layer faces the convex lenses 308 and 309. In addition, as shown in FIG. 1, the phosphor wheel 100 has a phosphor ring 101 that is a phosphor layer on the circumference at the same distance from the rotation center of the phosphor substrate 1. With the rotation of 1, the light of the first semiconductor laser 302 converged by the convex lenses 308 and 309 is arranged to be emitted as excitation light for exciting the phosphor. Here, the collimator lens 303, the convex lens 304, the diffusion plate 305, the concave lens 306, the dichroic mirror 307, and the convex lenses 308 and 309 are examples of the light guide optical system.

  The excitation light from the first semiconductor laser 302 incident on the phosphor ring 101 that is the phosphor layer is converted in wavelength to fluorescence in a wavelength region different from the wavelength of the first semiconductor laser 302, The direction is changed by 180 degrees and emitted to the convex lens 309 side. The fluorescence incident on the convex lens 309 is incident on the convex lens 308, converted into parallel light, and incident on the dichroic mirror 307.

  As described above, the dichroic mirror 307 is disposed at an angle of 45 degrees with respect to the optical axis of the fluorescence, transmits light in the wavelength region of the emitted light of the first semiconductor laser 302, and emits light from the phosphor wheel 100. It has the characteristic of reflecting light in the fluorescent wavelength region. Accordingly, the traveling direction of the fluorescence incident on the dichroic mirror 307 is bent by 90 degrees.

  Next, the light emitted from the plurality of second semiconductor lasers 322 is collimated by the collimator lens 323 disposed on the emission side of each second semiconductor laser 322. On the emission side of the collimator lens 323, a convex lens 324 that reduces the beam width by collecting the light of the second semiconductor lasers 322 emitted from the plurality of collimator lenses 323 is provided. The outgoing light whose beam width is reduced by the convex lens 324 is incident on the diffusion plate 325 located on the outgoing side of the convex lens 324. The diffuser plate 325 eliminates the non-uniformity of the light flux in the state where the light of the second semiconductor laser 322 that could not be eliminated by the convex lens 324 has passed through the collimator lens 323.

  Light emitted from the diffusion plate 325 enters the concave lens 326. The concave lens 326 converts the light incident from the diffusion plate 325 into parallel light.

  The collimated light emitted from the concave lens 326 is incident on the dichroic mirror 307 disposed at an angle of 45 degrees with respect to the optical axis on the emission side from a direction different from the fluorescence emitted from the phosphor wheel 100 by 90 degrees. To do. The dichroic mirror 307 has a characteristic of transmitting light in the wavelength region of the emitted light of the second semiconductor laser 322 and reflecting light in the wavelength region of fluorescence from the phosphor wheel 100. Therefore, the light from the concave lens 326 incident on the dichroic mirror 307 is transmitted. As a result, the fluorescence emitted from the phosphor wheel 100 and the light emitted from the second semiconductor laser 322 are emitted in the same direction.

  The fluorescence from the phosphor wheel 100 and the laser light from the second semiconductor laser 322 are converged by the convex lens 310 and are incident on the rod integrator 311 which is a light uniformizing means. The intensity distribution of the light emitted from the rod integrator 311 is made uniform.

  Here, the light emitted from the second semiconductor laser 322 is light in the blue wavelength region, and the light emitted from the first semiconductor laser 302 is light in the ultraviolet to blue wavelength region. In addition, the phosphor included in the phosphor ring 101 of the phosphor wheel 100 is excited by light in the wavelength region of the first semiconductor laser 302 and emits yellow fluorescence including both green and red wavelength regions.

  With the above configuration, white light with a uniform intensity distribution is emitted from the rod integrator 311 of the light source device 3.

[1-4] Projection-type image display device using light source device equipped with phosphor wheel of embodiment 1 Next, a light source device 3 equipped with the phosphor wheel 100 of embodiment 1 will be described with reference to FIG. The configuration of a projection display apparatus using the above will be described.

  The projection display apparatus uses the light source device 3 described with reference to FIG. The details of the light source device 3 will be omitted, and the behavior of the white light emitted from the rod integrator 311 and the configuration of the projection display device will be described.

  First, white light emitted from the rod integrator 311 is transferred to a DMD (digital micromirror device) 338, 339, and 340, which will be described later, by a relay lens system including three convex lenses 331, 332, and 333. The exit surface of the integrator 311 is mapped.

  The light that has passed through the convex lenses 331, 332, and 333 constituting the relay lens system is incident on a total reflection prism 334 in which a minute gap 335 is provided between two glass blocks. The light that has entered the total reflection prism 334 is reflected by the above-described minute gap 335 and is incident on a color prism 336 that is composed of three glass blocks. The color prism 336 has a minute gap 337 between the first glass block and the second glass block, and a dichroic surface that reflects light in the blue wavelength region on the first glass block side.

  Of the white light that has entered the color prism 336 from the total reflection prism 334, the light in the blue wavelength region is a dichroic surface that reflects the blue region provided in the first glass block on the front side of the minute gap 337 of the color prism. The light is reflected and totally reflected by a gap provided between the color prism 336 and the total reflection prism 334, and is incident on the blue DMD 338 while changing the traveling direction of the light.

  Subsequently, the yellow light including the light in both the red and green regions that has passed through the minute gap 337 of the color prism is provided on the boundary surface between the second glass block and the third glass block of the color prism 336. In addition, the dichroic surface that reflects light in the red wavelength range and transmits light in the green wavelength range is separated into red light and green light, the red light is reflected, and the green light is reflected on the second glass block. The light passes through and enters the third glass block.

  The red light reflected at the interface between the second glass block and the third glass block is incident on the minute gap 337 provided between the second glass block and the first glass block at an angle greater than the total reflection. And is incident on the red DMD 339.

  The green light incident on the third glass block travels straight and enters the green DMD 340.

  The three DMDs 338, 339, and 340 are driven by a video circuit (not shown), and ON / OFF of each pixel is switched corresponding to image information to change the reflection direction.

  The light from the ON pixels of the three DMDs 338, 339, and 340 passes through the above-described path in the reverse direction and is combined by the color prism 336 to become white light and enter the total reflection prism 334. The light incident on the total reflection prism 334 is incident on the minute gap 335 of the total reflection prism 334 at an angle equal to or smaller than the total reflection angle, is transmitted as it is, and is enlarged and projected on a screen (not shown) by the projection lens 341.

(Embodiment 2)
[2-1] Structure of phosphor substrate The structure of the phosphor wheel according to the second embodiment will be described with reference to FIG.

  5A and 5B are diagrams showing the configuration of the phosphor substrate 4 according to the second embodiment. FIG. 5A is a plan view, FIG. 5B is a back view, and FIGS. 5B and 5C. ) Is a sectional view of the main part, and FIG. 5 (e) is a sectional view.

  The substrate 403 of the phosphor substrate 4 has a disk shape made of aluminum, and an attachment hole 405 to which a rotation shaft of a motor 451 (see FIG. 6) is attached is opened at the center. By attaching a motor 451 to the substrate 403 of the phosphor substrate 4, a phosphor wheel 400 is configured, and the phosphor substrate 4 is rotationally driven by the motor 451. Further, at least one surface of the substrate 403 is provided with an increased reflection film layer 431 provided with an unillustrated undercoat and topcoat in order to improve surface reflectance.

  On the increased reflection film layer 431 of the substrate 403, an adhesive layer 402 having a constant width and thickness in the form of a ring is formed on a circumference having the same distance from the rotation center of the substrate 403 as shown in FIG. Is done. An opening 407 is provided on the same circumference as the adhesive layer 402.

  Further, the protrusions provided on the back surface of the substrate 403 will be described with reference to FIGS. 5B and 5E.

  On the side (back surface) of the substrate 403 where the increased reflection film layer 431 is not provided, the protrusions 404 each having a certain width and thickness are formed in a ring shape on two circumferences having different distances from the rotation center of the substrate 403. Is formed. The protruding portion 404 can be provided by removing a portion other than the protruding portion by etching a substrate thicker than the substrate 403 before processing.

  As a method of providing the two protrusions 404 at different positions in the radial direction in the circumferential direction of the substrate 403 as described above, the protrusions may be provided by machining such as cutting in addition to processing by etching. Good. In the present embodiment, two ridges are provided, but three or more ridges may be provided.

Further, although the description has been made with the configuration in which the protrusion portion 404 is not provided in the opening portion 407, of course, the protrusion portion 404 may be provided on the outer peripheral side and the inner peripheral side of the opening portion 407. Details of the phosphor substrate 4 will be described as follows with reference to FIG. 5C and FIG.

  First, the adhesive layer 402 is configured by containing contained particles 421 that increase reflectance and thermal conductivity in a resin silicone 422.

  The phosphor ring segments 401 and 406 are composed of phosphors 411 and 461 and alumina 412 and 462. The phosphors 411 and 461 here have different fluorescence spectra. For example, the phosphor ring segment 401 emits yellow fluorescence, and the phosphor ring segment 406 emits green fluorescence. However, the emission spectrum of fluorescence is not limited by the above description.

  As a material used for the adhesive layer 402, in order to buffer the strain caused by the difference in thermal expansion coefficient between the substrate 403 and the phosphor ring segments 401 and 406 constituting the phosphor layer, It is desirable to use a curable resin silicone. In addition, it is desirable to use a dimethyl-based thermosetting resin silicone as the resin silicone used for the adhesive layer from the property of buffering strain.

  The phosphor substrate 4 according to the second embodiment has the same configuration as the phosphor substrate 1 according to the first embodiment except that a plurality of phosphor ring segments are provided.

[2-2] Effects By providing the protrusions 404 as shown in FIGS. 5B, 5C, 5D, and 5E, deformation of the substrate 403 is suppressed, and room temperature is obtained as shown in FIG. Even when used in the above, the shape of the phosphor substrate 4 does not change.

[2-3] Light Source Device Using Phosphor Wheel of Second Embodiment Details of the light source device 5 using the phosphor wheel 400 of the second embodiment will be described with reference to FIG.

  First, the phosphor wheel 400 includes the phosphor substrate 4 and a motor 451 that rotationally drives the phosphor substrate 4.

  Light emitted from the plurality of semiconductor lasers 502 is collimated by a collimator lens 503 disposed on the emission side of each semiconductor laser 502. On the exit side of the collimator lens 503, a convex lens 504 that reduces the beam width by collecting the light of the semiconductor lasers 502 emitted from the plurality of collimator lenses 503 is provided. The outgoing light whose beam width has been reduced by the convex lens 504 is incident on the diffusion plate 505 located on the outgoing side of the convex lens 504. The diffuser plate 505 eliminates the density of the light flux generated in the state where the light emitted from the semiconductor laser 502 has passed through the collimator lens 503 that could not be eliminated by the convex lens 504. Here, the semiconductor laser 502 is an example of an excitation light source.

  Light emitted from the diffusion plate 505 enters the concave lens 506. The concave lens 506 converts the light incident from the diffusion plate 505 into parallel light.

  The collimated light emitted from the concave lens 506 is incident on a dichroic mirror 507 disposed on the exit side at an angle of 45 degrees with respect to the optical axis. The dichroic mirror 507 has a characteristic of reflecting light in the wavelength region of the emitted light of the semiconductor laser 502 and transmitting light in the fluorescent wavelength region from the phosphor wheel 400. Therefore, the light from the concave lens 506 incident on the dichroic mirror 507 is reflected and incident on the convex lenses 508 and 509 in order, so that the light flux is converged and incident on the phosphor wheel 400.

  The phosphor wheel 400 is disposed on the phosphor ring segments 401 and 406 so as to face the convex lenses 508 and 509.

  As shown in FIG. 5, the phosphor wheel 400 has a first phosphor ring segment 401, a second phosphor ring segment 406, and an opening 407 on a circumference at the same distance from the rotation center of the phosphor wheel 400. As the phosphor substrate 4 rotates, the light of the semiconductor laser 502 converged by the convex lenses 508 and 509 is irradiated in the order of the phosphor ring segments 401 and 406 and the opening 407 in time series.

  Hereinafter, the behavior when laser light is irradiated will be described in the order described above.

  First, when the first phosphor ring segment 401 is irradiated with laser light, the phosphor ring segment 401 converts the wavelength of the semiconductor laser 502 into first fluorescence having a different wavelength, The light is emitted toward the convex lens 509 side. Here, the following explanation will be made assuming that the first fluorescent light is yellow light having emission spectra of red and green regions. The light incident on the convex lens 509 is incident on the convex lens 508, converted into parallel light, and incident on the dichroic mirror 507.

  Subsequently, when the second phosphor ring segment 406 is irradiated with the light of the semiconductor laser, the light of the semiconductor laser 502 is emitted from the semiconductor ring 502 and the wavelength of both the semiconductor laser 502 and the first fluorescence. Are converted into different second fluorescence and emitted to the convex lens 509. Here, the following explanation proceeds with the second fluorescence as light in the green wavelength region. The light incident on the convex lens 509 is incident on the convex lens 508, converted into parallel light, and incident on the dichroic mirror 507.

  Finally, when the light of the semiconductor laser 502 is irradiated to the opening 407, the light passes through the phosphor wheel 400, sequentially enters the convex lenses 510 and 511, and the collimated light is emitted.

  The light emitted from the convex lenses 510 and 511 is changed into a parallel light while changing its traveling direction by a relay optical system composed of three mirrors 512, 514 and 516 and three lenses 513, 515 and 517. The light enters the dichroic mirror 507 from a direction different from the first fluorescence and the second fluorescence by 90 degrees.

  Accordingly, the light of the semiconductor laser 502 is incident on the dichroic mirror 507 in a time series from the first fluorescent light, the second fluorescent light, and the direction different from the first fluorescent light and the second fluorescent light by 90 degrees. The dichroic mirror 507 has a characteristic of reflecting the light in the wavelength region of the light of the semiconductor laser 502 and transmitting the light in the wavelength region of the first fluorescence and the second fluorescence. The traveling direction is changed by 90 degrees, the light is emitted in the same direction as the first fluorescence and the second fluorescence, is incident on the convex lens 518, and the light flux is converged. Here, specifically, yellow light as the first fluorescence, green light as the second fluorescence light, and blue light from the semiconductor laser 502 are sequentially emitted.

  Here, the light converged by the convex lens 518 enters the color wheel 519. The color wheel 519 includes the phosphor wheel 400 and the color wheel 519 so that the region that transmits only the red region from the yellow light that is the first fluorescence matches the at least part of the timing at which the first fluorescence is incident. Is controlled by a synchronization circuit and a wheel drive circuit (not shown).

  With the configuration so far, the light that has passed through the color wheel 519 is yellow light that is the first fluorescence, red light that has passed through the red region of the color wheel 519 of the first fluorescence, and green light that is the second fluorescence. Then, the blue light of the semiconductor laser 502 is sequentially emitted and enters the rod integrator 520 which is a light uniformizing means.

  In the above description, the first fluorescence has been described as yellow light, the second fluorescence as green light, and the laser light as blue light. However, the first fluorescence may be combined with red light. As shown in FIG. 5, a plurality of openings may be provided so that the first phosphor ring segment and the second phosphor ring segment are not adjacent to each other. Further, in the above description, the number of fluorescent segments is two, but may be one or three or more. In addition, the semiconductor laser light may be ultraviolet light, not blue light, and the phosphor wheel 400 may have a third phosphor ring segment instead of the opening to emit blue light.

  Further, the color wheel 519 may have a red transmission region and a green transmission region, and the phosphor wheel 400 may have one phosphor ring segment and a yellow wavelength region.

[2-4] Projection-type image display device using light source device equipped with phosphor wheel of embodiment 2 Next, a light source device 6 equipped with the phosphor wheel 400 of embodiment 2 will be described with reference to FIG. The configuration of a projection display apparatus using the above will be described.

  The projection display apparatus employs the light source device 5 described with reference to FIG. The details of the light source device 5 will be omitted, and the behavior of the emitted light in which the wavelength range of the light emitted from the rod integrator 520 is changed in time series and the configuration of the projection display apparatus will be described.

  First, the white light emitted from the rod integrator 520 is mapped to the DMD 526 (described later) on the exit surface of the rod integrator 520 by a relay lens system including three convex lenses 521, 522, and 523.

  Light that has passed through the convex lenses 521, 522, and 523 constituting the relay lens system is incident on a total reflection prism 524 in which a minute gap 525 is provided between two glass blocks. The light incident on the total reflection prism 524 is totally reflected by entering the above-described minute gap 525 at an angle equal to or greater than the total reflection angle, and then enters the DMD 526.

  The DMD 526 is supplied with a video signal synchronized with the phosphor wheel 400 and the color wheel 519 by a circuit (not shown), and the reflection direction is changed according to the image information.

  Light from the ON pixel of the DMD 526 enters the total reflection prism 524. The light incident on the total reflection prism 524 is incident on the minute gap 525 of the total reflection prism at an angle equal to or smaller than the total reflection angle, is transmitted as it is, and is projected on a screen (not shown) by the projection lens 527.

  The present disclosure can be applied to a light source device of a projection display apparatus.

1, 2, 4 Phosphor substrate 100, 400 Phosphor wheel 101, 201 Phosphor ring 111, 211, 411, 461 Phosphor 112, 212, 412, 462 Alumina 102, 202, 402 Adhesive layer 121, 221 and 421 included Particles 122, 222, 422 Resin silicone 103, 203, 403 Substrate 131, 231, 431 Increasing reflection film layer 104, 404 Projection 105, 205, 405 Mounting hole 151, 451 Motor 302 Semiconductor laser 303, 323, 503 Collimator lens 304, 324, 504 Convex lens 305, 325, 505 Diffuser plate 306, 326, 506 Concave lens 307, 507 Dichroic mirror 308, 309, 508, 509 Convex lens 310, 518, 331, 332, 333 Convex lens 311 520 Rod integrator 322 semiconductor lasers 334,524 total reflection prism 335,337,525 minute gap 336 color prism 338,339,340,526 DMD
341, 527 Projection lens 401, 406 Phosphor ring segment 407 Aperture 502 Semiconductor laser 510, 511 Convex lens 512, 514, 516 Mirror 513, 515, 517 Lens 519 Color wheel 521, 522, 523 Convex lens

Claims (5)

A disc-shaped metal substrate;
A phosphor layer provided circumferentially on one surface of the metal substrate;
An adhesive layer for adhering the phosphor layer to the metal substrate,
The phosphor substrate, wherein at least two protrusions are provided on the other surface of the metal substrate at different positions in the radial direction in the circumferential direction of the metal substrate.   The phosphor substrate according to claim 1, wherein the metal substrate is an aluminum substrate, the phosphor layer is an inorganic phosphor, and the adhesive layer is a mixture of a resin adhesive and titanium oxide.   A phosphor wheel that rotationally drives the phosphor substrate by a motor attached to the phosphor substrate according to claim 1. An excitation light source;
A light guide optical system that guides light emitted from the excitation light source;
A light source device that emits fluorescence when the excitation light from the light guide optical system irradiates the phosphor layer of the phosphor wheel according to claim 3.   A projection display apparatus comprising the light source device according to claim 4.