JP6931770B2 - Fluorescent wheel device, light source device, and projection type image display device - Google Patents

Description

The present disclosure relates to, for example, a phosphor wheel device used as a light source device of a projection type image display device, and a light source device and a projection type image display device including such a phosphor wheel device.

Some conventional projection type image display devices use fluorescent light generated by applying excitation light to a phosphor. In this type of projection type image display device, the temperature of the phosphor may rise as the brightness increases.

Patent Document 1 discloses a configuration of a phosphor wheel device having a heat dissipation function. This phosphor wheel device includes a phosphor wheel, a large number of air holes penetrating the phosphor wheel, and an impeller. The phosphor wheel has a first surface coated with at least one type of phosphor on the outer peripheral portion, and a second surface located on the opposite side of the first surface. The impeller is provided on the second surface side of the phosphor wheel and has an intake port and a first exhaust port. When the phosphor wheel rotates at high speed, a part of the air taken in from the intake port of the impeller is exhausted from the exhaust port provided in the impeller, and the rest passes through many air holes to the front surface side of the phosphor wheel. It is carried and removes heat from the surface of the fluorophore wheel.

According to Patent Document 1, it is possible to improve the cooling efficiency without increasing the size of the phosphor wheel, and it is possible to suppress a partial temperature rise of the phosphor coated portion. Therefore, it is possible to realize the miniaturization of the laser projection system using this phosphor wheel. Alternatively, the resistance to high-power excitation light can be improved without increasing the size of the phosphor wheel, and the brightness of the laser projection system can be improved.

U.S. Pat. No. 9010971

In a phosphor wheel device having a large number of openings (air holes) in the substrate, the thermal conductivity of the substrate may decrease due to the provision of the openings, and a local temperature rise of the phosphor may occur. ..

The present disclosure provides a phosphor wheel device which suppresses a decrease in thermal conductivity of a substrate and a local temperature rise of a phosphor and has excellent heat dissipation characteristics as compared with the conventional one.

The phosphor wheel device according to one aspect of the present disclosure is a phosphor region containing a substrate and a phosphor provided on at least a part of a circumference having a first radius from the center of rotation of the substrate on the surface of the substrate. And. The substrate has a ventilation region including a plurality of openings closer to the rotation center of the substrate than the phosphor region, and a heat transfer region farther from the rotation center of the substrate than the phosphor region.

The present disclosure can provide a phosphor wheel device which suppresses a decrease in thermal conductivity of a substrate and a local temperature rise of a phosphor and has excellent heat dissipation characteristics as compared with the conventional case.

It is a top view which shows the structure of the phosphor wheel assembly 1 which comprises the phosphor wheel apparatus 100 which concerns on Embodiment 1. FIG. It is a side view which shows the structure of the phosphor wheel assembly 1 of FIG. It is a block diagram which shows the structure of the light source apparatus 2 which includes the phosphor wheel assembly 1 of FIG. It is a block diagram which shows the structure of the projection type image display device which includes the light source device 2 of FIG. It is a top view which shows the structure of the phosphor wheel assembly 1A which concerns on Embodiment 2. FIG. FIG. 5 is a configuration diagram showing a configuration of a light source device 2A including the phosphor wheel assembly 1A of FIG. It is a block diagram which shows the structure of the projection type image display device which includes the light source device 2A of FIG.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanations of already well-known matters and duplicate explanations for substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to facilitate the understanding of those skilled in the art.

It should be noted that the applicant is not intended to limit the subject matter described in the claims by those skilled in the art by providing the accompanying drawings and the following description in order to fully understand the present disclosure. No.

(Embodiment 1)
The phosphor wheel device, the light source device, and the projection type image display device according to the first embodiment will be described with reference to FIGS. 1 to 4.

[1-1] Fluorescent Wheel Device The fluorescent wheel device according to the first embodiment will be described with reference to FIGS. 1 and 2.

FIG. 1 is a plan view showing the configuration of a phosphor wheel assembly 1 including the phosphor wheel device 100 according to the first embodiment. FIG. 2 is a side view showing the configuration of the phosphor wheel assembly 1 of FIG.

As shown in FIG. 2, the fluorophore wheel assembly 1 includes a fluorophore wheel device 100, a motor 111, and a cap 112. The phosphor wheel device 100 is fixed to the motor 111 by the cap 112, and is rotated around the rotation shaft 110 (rotation center) by the motor 111. The motor 111 is a drive device for rotating the phosphor wheel device 100.

As shown in FIG. 1, the phosphor wheel device 100 includes a substrate 101 that rotates about a rotation shaft 110, a phosphor 102, a ventilation region 103, a plurality of first openings 104, a plurality of second openings 105, and a transmission. It includes a thermal region 106 and a plurality of fins 107.

The substrate 101 is made of a material having high thermal conductivity. The surface of the substrate 101 is a reflective surface on which a reflective film is formed, and the phosphor 102 is formed on the reflective surface.

The phosphor 102 constitutes a region (fluorescent region 108) provided on the surface of the substrate 101 at least in a part of the circumference having a first radius r1 from the center of rotation of the substrate 101. In the first embodiment, the phosphor 102 is formed by being applied in an annular shape. The phosphor 102 contains, for example, a phosphor that generates fluorescent light with green to yellow as the main wavelength range. The phosphor 102 contains, for example, a phosphor that efficiently absorbs blue excitation light to efficiently generate fluorescent light and has high resistance to temperature quenching. _{The phosphor 102 contains, for example, Y 3} Al ₅ O ₁₂ : Ce ³⁺ , which is an active garnet structure phosphor with cerium. As will be described later, the phosphor 102 emits yellow light in response to the excitation light. Of the yellow light emitted from the phosphor 102, the light emitted toward the reflective film of the substrate 101 (in the −Z direction of FIG. 2) is reflected by the reflective film and inverts and proceeds.

The phosphor 102 shown in FIG. 1 is an example of a phosphor, and the phosphor wheel device 100 shown in FIG. 1 is an example of a phosphor wheel.

The ventilation region 103 is a region of the substrate 101 including a plurality of openings closer to the rotation axis 110 (center of rotation) of the substrate 101 than the phosphor region 108. The plurality of openings includes a plurality of first openings 104 and a plurality of second openings 105. The plurality of first openings 104 are provided on the circumference having a second radius r2 smaller than the first radius r1 from the center of rotation of the substrate 101. The plurality of second openings 105 are provided on the circumference having a third radius r3 smaller than the second radius r2 from the center of rotation of the substrate 101.

When the plurality of first openings 104 all have the same area and the plurality of second openings 105 also have the same area, the area of each second opening 105 is larger than the area of each first opening 104. May be good.

When the plurality of first openings 104 all have the same shape and the plurality of second openings 105 also have the same shape, the shape of each second opening 105 is different from the shape of each first opening 104. You may be. In the example of FIG. 1, each first opening 104 is quadrangular and each second opening 105 is circular.

The sum of the areas S1 (1), S1 (2), S1 (3), ..., S1 (M) of the plurality of M first openings 104 is S1 = S1 (1) + S1 (2) + S1 (3). + ... + S1 (M). The sum of the areas S2 (1), S2 (2), S2 (3), ..., S2 (N) of the plurality of N second openings 105 is S2 = S2 (1) + S2 (2) + S2 (3). + ... + S2 (N). At this time, the total area S2 of the plurality of second openings 105 is preferably the total sum S1 or more of the areas of the plurality of first openings 104.

The heat transfer region 106 is a region of the substrate 101 that is farther from the rotation axis 110 (center of rotation) of the substrate 101 than the phosphor region 108.

The area S3 of the heat transfer region 106 is preferably the total area S1 + S2 or more of the areas of the plurality of openings 104 and 105.

The plurality of fins 107 are provided in the ventilation region 103 of the substrate 101 so as to generate an air flow from the ventilation region 103 to the heat transfer region 106 when the substrate 101 is rotated. The plurality of fins 107 may be provided on the surface of the substrate 101 opposite to the surface on which the phosphor 102 is provided, or may be provided on the same surface. The plurality of fins 107 are provided on the circumference having a third radius r3 from the rotation axis 110 (rotation center) of the substrate 101. Therefore, the plurality of fins 107 and the plurality of second openings 105 are alternately provided on the circumference having the third radius r3 from the rotation axis 110 of the substrate 101. The angle of the fin 107 is determined according to the desired cooling efficiency.

[1-2] Operation of Fluorescent Wheel Device According to the fluorescent wheel assembly 1 of FIG. 1, the phosphor wheel device 100 is provided with a plurality of openings 104 and 105, so that the motor 111 and the plurality of fins 107 are raised. The convection of the air can wrap around the surface of the region coated with the phosphor 102. Thereby, the heat dissipation performance from the front surface of the phosphor wheel device 100 can be improved. However, in general, the provision of openings in the fluorophore wheel device causes a local decrease in the thermal conductivity of the substrate and causes a local temperature rise in a portion of the fluorophore-coated area. Therefore, in the phosphor wheel device 100 of FIG. 1, a heat transfer region 106 is provided on the substrate 101 at a position paired with the ventilation region 103 across the region coated with the phosphor 102. As a result, the heat dissipation performance from the front surface of the phosphor wheel device 100 due to air convection can be improved, the local thermal conductivity of the substrate 101 is lowered, and the region coated with the phosphor 102 is locally applied. It is possible to suppress a large temperature rise. Therefore, according to the first embodiment, it is possible to provide the phosphor wheel device 100 and the phosphor wheel assembly 1 having excellent heat dissipation characteristics as compared with the conventional case.

[1-3] Light Source Device Provided with Fluorescent Wheel Device The light source device according to the first embodiment will be described with reference to FIG.

FIG. 3 is a configuration diagram showing a configuration of a light source device 2 including the phosphor wheel assembly 1 of FIG. The light source device 2 includes a phosphor wheel assembly 1, a plurality of first laser light sources 202, a collimator lens 203, a convex lens 204, 208, 209, 210, a diffuser plate 205, a concave lens 206, a dichroic mirror 207, a rod integrator 211, and a plurality of rod integrators. A second laser light source 222, a collimator lens 223, a convex lens 224, a diffuser plate 225, and a concave lens 226 are provided.

The plurality of first laser light sources 202 are excitation light sources that generate excitation light having a predetermined wavelength.

The light emitted from the plurality of first laser light sources 202 is collimated by the collimator lens 203 arranged on the exit side of each of the first laser light sources 202. On the exit side of the collimator lens 203, a convex lens 204 that collectively reduces the light flux width of the first laser light source 202 emitted from the plurality of collimator lenses 203 is provided. The emitted light whose luminous flux width is reduced by the convex lens 204 is incident on the diffuser plate 205 located on the emission side of the convex lens 204. The diffuser plate 205 eliminates the density of the luminous flux generated in the state where the emitted light of the first laser light source 202 has passed through the collimator lens 203, which cannot be completely eliminated by the convex lens 204.

The light emitted from the diffuser plate 205 is incident on the concave lens 206. The concave lens 206 converts the light incident from the diffuser 205 into parallel light.

The parallelized light emitted from the concave lens 206 is incident on the dichroic mirror 207 arranged at an angle of 45 degrees with respect to the optical axis on the emission side. The dichroic mirror 207 has a property of transmitting light in the wavelength range of the emitted light of the first laser light source 202 and reflecting light in the wavelength range of fluorescence from the phosphor wheel assembly 1. Therefore, the light from the concave lens 206 incident on the dichroic mirror 207 is incidentally incident on the plurality of convex lenses 208 and 209, the luminous flux is converged, and the light is incident on the phosphor wheel assembly 1.

In the phosphor wheel assembly 1, the phosphor 102 is arranged so as to face the convex lenses 208 and 209. As a result, the light of the first laser light source 202 converged by the convex lenses 208 and 209 is irradiated as the excitation light for exciting the phosphor 102.

The excitation light from the first laser light source 202 incident on the phosphor 102 is wavelength-converted, converted into fluorescence in a wavelength range different from the wavelength of the laser light source 202, and the direction of the light is converted by 180 degrees to form a convex lens. It emits to the 209 side. The fluorescence incident on the convex lens 209 is incident on the convex lens 208, collimated, and incident on the dichroic mirror 207, and the traveling direction thereof is bent by 90 degrees.

Next, the light emitted from the plurality of second laser light sources 222 is collimated by the collimator lens 223 arranged on the exit side of each of the second laser light sources 222. On the exit side of the collimator lens 223, a convex lens 224 that collectively reduces the light flux width of the second laser light source 222 emitted from the plurality of collimator lenses 223 is provided. The emitted light whose luminous flux width is reduced by the convex lens 224 is incident on the diffuser plate 225 located on the emission side of the convex lens 224. The diffuser plate 225 eliminates the density of the luminous flux generated when the emitted light of the second laser light source 222, which could not be completely eliminated by the convex lens 224, passes through the collimator lens 223.

The light emitted from the diffuser plate 225 is incident on the concave lens 226. The concave lens 226 converts the light incident from the diffuser plate 225 into parallel light.

The collimated light emitted from the concave lens 226 is transmitted to the dichroic mirror 207 arranged at an angle of 45 degrees with respect to the optical axis on the emitting side from a direction 90 degrees different from the fluorescence emitted from the phosphor wheel assembly 1. Incident. The dichroic mirror 207 has a property of transmitting light in the wavelength range of the emitted light of the first laser light source 202 and the second laser light source 222 and reflecting light in the wavelength range of fluorescence from the phosphor wheel assembly 1. ing. Therefore, the light from the concave lens 226 incident on the dichroic mirror 207 is transmitted. As a result, the fluorescence emitted from the phosphor wheel assembly 1 and the light emitted from the second laser light source 222 are emitted in the same direction.

The fluorescence from the phosphor wheel assembly 1 and the laser light from the second laser light source 222 converge at the convex lens 210 and enter the rod integrator 211 which is a light equalizing means. The intensity distribution of the light emitted from the rod integrator 211 is uniform.

Here, the light emitted by the second laser light source 222 is light in the blue wavelength region, and the light emitted by the first laser light source 202 is light in the ultraviolet to blue wavelength region. Further, the phosphor wheel assembly 1 is excited by light in the wavelength range of the first laser light source 202, and emits yellow fluorescent light including both green and red wavelength ranges.

With the above configuration, white light having a uniform intensity distribution is emitted from the rod integrator 211 of the light source device 2.

According to the light source device 2, the excitation light from the laser light source 202 is guided to the phosphor wheel device 100 by a light guide optical system including a lens, a mirror, and the like, and the excitation light irradiates the phosphor 102 of the phosphor wheel device 100. Fluorescent light is generated by this.

[1-4] Projection-type image display device using a light source device equipped with a phosphor wheel The projection-type image display device according to the first embodiment will be described with reference to FIG.

FIG. 4 is a configuration diagram showing a configuration of a projection type image display device including the light source device 2 of FIG. The projection type image display device of FIG. 4 includes a light source device 2, a convex lens 331, 332, 333, a total reflection prism 334, a minute gap 335, a color prism 336, a minute gap 337, a DMD 338, 339, 340, and a projection lens 341. ..

The projection type image display device of FIG. 4 includes a light source device 2 described with reference to FIG. The details of the light source device 2 will not be described repeatedly, but the behavior of the white light emitted from the rod integrator 211 and the configuration of the projection type image display device will be described below.

First, the white light emitted from the rod integrator 211 is a relay lens system composed of three convex lenses 331, 332, and 333. Map the exit surface.

The light that has passed through the convex lenses 331, 332, and 333 that form the relay lens system is incident on the total reflection prism 334 that has a minute gap 335 between the two glass blocks. The light incident on the total reflection prism 334 is reflected by the above-mentioned minute gap 335 and is incident on the color prism 336 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 side of the first glass block.

Of the white light incident on the color prism 336 from the total reflection prism 334, the light in the blue wavelength region is reflected by the dichroic surface reflecting the blue region provided in the first glass block on the front side of the minute gap 337. .. The blue light reflected by the dichroic surface generates total reflection in the gap provided between the color prism 336 and the total reflection prism 334, changes the traveling direction of the light, and is incident on the DMD 338 for blue.

Subsequently, the yellow light including the light in both the red and green regions that have passed through the minute gap 337 is red, which is provided at the interface between the second glass block and the third glass block of the color prism 336. It is separated into red light and green light by a dichroic surface that reflects light in the wavelength range of and transmits light in the green wavelength range. Of the separated red light and green light, the red light is reflected, the green light is transmitted, and is incident on 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 equal to or greater than total reflection. By doing so, it is reflected and incident on the red DMD339.

The green light incident on the third glass block goes straight as it is, and is incident on the DMD340 for green.

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

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

[1-5] Effect of the first embodiment According to the phosphor wheel device 100 of the first embodiment, the circumference of the substrate 101 and the surface of the substrate 101 having a first radius r1 from the center of rotation of the substrate 101. It includes a phosphor region 108 including a phosphor 102 provided in at least a part of the above. The substrate 101 has a ventilation region 103 including a plurality of openings closer to the rotation center of the substrate 101 than the phosphor region 108, and a heat transfer region 106 farther from the rotation center of the substrate 101 than the phosphor region 108.

Thereby, it is possible to provide a phosphor wheel device which suppresses a decrease in thermal conductivity of the substrate and a local temperature rise of the phosphor and has excellent heat dissipation characteristics as compared with the conventional case.

According to the phosphor wheel device 100 according to the first embodiment, the area of the heat transfer region 106 is equal to or larger than the total area of the plurality of openings.

As a result, it is possible to suppress a decrease in the thermal conductivity of the substrate and a local temperature rise of the phosphor due to the provision of the opening.

According to the phosphor wheel device 100 according to the first embodiment, the plurality of openings are provided on the circumference having a second radius r2 smaller than the first radius r1 from the center of rotation of the substrate 101. The opening 104 of 1 includes a plurality of second openings 105 provided on the circumference having a third radius r3 smaller than the second radius r2 from the center of rotation of the substrate 101.

According to the phosphor wheel device 100 according to the first embodiment, the total area of the plurality of second openings 105 is equal to or greater than the total area of the plurality of first openings 104.

According to the phosphor wheel device 100 according to the first embodiment, the area of each second opening 105 is larger than the area of each first opening 104.

According to the phosphor wheel device 100 according to the first embodiment, the shape of each second opening 105 is different from the shape of each first opening 104.

According to the phosphor wheel device 100 according to the first embodiment, the phosphor wheel device 100 is provided in the ventilation region 103 of the substrate 101 so as to generate an air flow from the ventilation region 103 to the heat transfer region 106 when the substrate 101 is rotated. A plurality of fins 107 are further provided.

According to the phosphor wheel device 100 according to the first embodiment, the plurality of fins 107 are provided on the circumference having a third radius r3 from the center of rotation of the substrate 101.

Thereby, it is possible to provide a phosphor wheel device which suppresses a decrease in thermal conductivity of the substrate and a local temperature rise of the phosphor and has excellent heat dissipation characteristics as compared with the conventional case.

According to the light source device according to the first embodiment, the above-mentioned phosphor wheel device 100, a motor 111 for rotating the phosphor wheel device 100, a first laser light source 202 for generating excitation light having a predetermined wavelength, and excitation light. Is provided with a light guide optical system that guides light to the phosphor wheel device 100. Fluorescent light is generated by irradiating the phosphor 102 of the phosphor wheel device 100 with the excitation light.

As a result, it is possible to provide a light source device having better heat dissipation characteristics than the conventional one by suppressing a decrease in thermal conductivity of the substrate of the phosphor wheel device and a local temperature rise of the phosphor.

According to the projection type image display device according to the first embodiment, the light source device 2 described above is provided.

As a result, it is possible to provide a projection type image display device which suppresses a decrease in thermal conductivity of the substrate of the phosphor wheel device and a local temperature rise of the phosphor and has excellent heat dissipation characteristics as compared with the conventional case.

(Embodiment 2)
The phosphor wheel device, the light source device, and the projection type image display device according to the second embodiment will be described with reference to FIGS. 5 to 7.

[2-1] Fluorescent Wheel Device The fluorescent wheel device according to the second embodiment will be described with reference to FIG.

FIG. 5 is a plan view showing the configuration of the phosphor wheel assembly 1A according to the second embodiment. The fluorophore wheel assembly 1A includes a fluorophore wheel device 100A. The fluorescent wheel assembly 1A further includes a motor 111 and a cap 112, similar to the fluorescent wheel assembly 1 of FIG.

The phosphor wheel device 100A includes a substrate 101, phosphors 102a and 102b, a transmission region 102c, a ventilation region 103, a plurality of first openings 104, a plurality of second openings 105, a heat transfer region 106, and a plurality of fins 107. To be equipped. The phosphor wheel device 100A includes phosphors 102a and 102b and a transmission region 102c in place of the phosphor 102 formed by being applied in an annular shape in FIG.

The phosphors 102a and 102b and the transmission region 102c are provided on the surface of the substrate 101 on a circumference having a predetermined radius r1 from the center of rotation of the substrate 101.

The phosphors 102a and 102b generate fluorescent light having different wavelengths from each other. The phosphor 102a is, for example, a phosphor that generates fluorescent light with yellow as the main wavelength region. The phosphor 102a is, for example, a phosphor that efficiently absorbs blue excitation light to efficiently generate fluorescent light and has high resistance to temperature quenching. The phosphor 102a is, for example, Y ₃ Al ₅ O ₁₂ : Ce ³⁺ , which is an active garnet structure phosphor with cerium. The phosphor 102b is, for example, a phosphor that generates fluorescent light with green as the main wavelength region. The phosphor 102b is, for example, a phosphor that efficiently absorbs blue excitation light to efficiently generate fluorescent light and has high resistance to temperature quenching. The phosphor 102b is, for example, Lu ₃ Al ₅ O ₁₂ : Ce ^3+, which is an active garnet structure phosphor with cerium. As will be described later, the phosphor 102a emits yellow light in response to the excitation light. Of the yellow light emitted from the phosphor 102a, the light emitted toward the reflective film of the substrate 101 is reflected by the reflective film and inverted. Further, the phosphor 102b emits green light in response to the excitation light, as will be described later. Of the green light emitted from the phosphor 102b, the light emitted toward the reflective film of the substrate 101 is reflected by the reflective film and is inverted.

The substrate 101 has a transmission region 102c in which no phosphor is formed and light is transmitted on the circumference having a first radius r1 from the center of rotation of the substrate 101. The substrate 101 may be made of a transparent material or may have an opening, at least in the portion of the transmission region 102c. As will be described later, a part of the excitation light irradiated to the phosphor wheel assembly 1A is not used to generate the fluorescent light by the phosphors 102a and 102b, but passes through the transmission region 102c and remains as it is. It is incident on the DMD.

The phosphors 102a and 102b shown in FIG. 5 are examples of phosphors, and the phosphor wheel device 100A shown in FIG. 5 is an example of a phosphor wheel.

Other components of the fluorophore wheel device 100A are similar to the corresponding components of the fluorophore wheel device 100 of FIG.

[2-2] Operation of Fluorescent Wheel Device According to the fluorescent wheel assembly 1A of FIG. 5, the heat dissipation performance of the fluorescent wheel device 100 can be improved as in the first embodiment, and the substrate 101 can be further subjected to heat dissipation performance. It is possible to suppress a local decrease in thermal conductivity and a local temperature rise in the region coated with the phosphor 102.

Since no phosphor is formed in the transmission region 102c, even if the excitation light is irradiated there, heat generation is less than that in the regions of the phosphors 102a and 102b. Therefore, it is not necessary to provide the plurality of openings 104, 105 and the plurality of fins 107 in the vicinity of the transmission region 102c for cooling.

[2-3] Light Source Device Using Fluorescent Material Wheel The light source device according to the second embodiment will be described with reference to FIG.

FIG. 6 is a configuration diagram showing a configuration of a light source device 2A including the phosphor wheel assembly 1A of FIG. The light source device 2A includes a phosphor wheel assembly 1A, a plurality of first laser light sources 502, a collimator lens 503, a convex lens 504, 508, 509, 510, 511, 516, a diffuser plate 505, a concave lens 506, a dichroic mirror 507, and a mirror 512. , 513,515, relay lens 514, filter wheel 517, and rod integrator 518.

The plurality of first laser light sources 502 are excitation light sources that generate excitation light having a predetermined wavelength.

The light emitted from the plurality of first laser light sources 502 is collimated by the collimator lens 503 arranged on the exit side of each of the first laser light sources 502. On the exit side of the collimator lens 503, a convex lens 504 that reduces the luminous flux width by collecting the light of the first laser light source 502 emitted from the plurality of collimator lenses 503 is provided. The emitted light whose luminous flux width is reduced by the convex lens 504 is incident on the diffuser plate 505 located on the emission side of the convex lens 504. The diffuser plate 505 eliminates the density of the luminous flux generated in the state where the emitted light of the first laser light source 502 has passed through the collimator lens 503, which could not be completely eliminated by the convex lens 504.

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

The parallelized light emitted from the concave lens 506 is incident on the dichroic mirror 507 arranged at an angle of 45 degrees with respect to the optical axis on the emission side. The dichroic mirror 507 has a property of reflecting light in the wavelength range of the emitted light of the first laser light source 502 and transmitting light in the wavelength range of fluorescence from the phosphor wheel assembly 1A. Therefore, the light from the concave lens 506 incident on the dichroic mirror 507 is incident on the plurality of convex lenses 508 and 509 in order, the luminous flux is converged, and the light is incident on the phosphor wheel assembly 1A.

In the phosphor wheel assembly 1A, the phosphors 102a and 102b are arranged so as to face the convex lenses 508 and 509, and the light of the first laser light source 502 converged by the convex lenses 508 and 509 excites the phosphors 102a and 102b. It is arranged so as to be irradiated as excitation light.

The excitation light from the first laser light source 502 incident on the phosphors 102a and 102b is wavelength-converted and converted into fluorescence in a wavelength range different from the wavelength of the laser light source 502, and the direction of the light is converted by 180 degrees. It emits light to the convex lens 509 side. The fluorescence incident on the convex lens 509 is incident on the convex lens 508, converted into parallel light, passes through the dichroic mirror 507, and travels straight.

On the other hand, as described above, the phosphors 102a and 102b and the transmission region 102c are provided on the surface of the substrate 101 on the circumference having a predetermined radius r1 from the rotation center of the substrate 101. Therefore, a part of the excitation light irradiated to the phosphor wheel assembly 1A passes through the transmission region 102c and is emitted to the convex lens 510 side. A part of the excitation light incident on the convex lens 510 is incident on the convex lens 511, collimated, and then is incident on the dichroic mirror 507 via the mirror 512, 513, the relay lens 514, and the mirror 515. The light from the mirror 515 incident on the dichroic mirror 507 is bent in the traveling direction by 90 degrees. As a result, the fluorescence emitted from the phosphor wheel assembly 1A and a part of the excitation light passing through the phosphor wheel assembly 1A are emitted in the same direction.

Here, the light emitted by the first laser light source 502 is light in the blue wavelength region. Further, the phosphor wheel assembly 1A is excited by light in the wavelength range of the first laser light source 502, and emits fluorescent light having green and yellow as the main wavelength ranges in time series, respectively. Further, a part of the excitation light that has passed through the phosphor wheel assembly 1A is not used to generate fluorescent light by the phosphor, but passes through the transmission region 102c and is directly incident on the DMD.

The combined light synthesized by the dichroic mirror 507 converges on the convex lens 516, passes through the filter wheel 517, and is incident on the rod integrator 518, which is a light equalizing means. At this time, a part of the fluorescence generated by the phosphor wheel assembly 1A having a main wavelength range of yellow is converted into light having a main wavelength range of red. Further, the intensity distribution of the light incident on the rod integrator 518 is made uniform.

With the above configuration, red, green, yellow, and blue light having a uniform intensity distribution is emitted in time series from the rod integrator 518 of the light source device 2A.

[2-4] Projection-type image display device using a light source device equipped with a phosphor wheel The projection-type image display device according to the second embodiment will be described with reference to FIG. 7.

FIG. 7 is a configuration diagram showing a configuration of a projection type image display device including the light source device 2A of FIG. The projection type image display device of FIG. 7 includes a light source device 2A, a convex lens 631, 632, 633, a total reflection prism 634, a minute gap 635, a DMD 636, and a projection lens 641.

The projection type image display device uses the light source device 2A described with reference to FIG. The details of the light source device 2A will not be described repeatedly, but the behavior of the light emitted from the rod integrator 518 and the configuration of the projection type image display device will be described below.

First, the light emitted from the rod integrator 518 maps the exit surface of the rod integrator 518 to the DMD 636 described later by a relay lens system composed of three convex lenses 631, 632, and 633.

The light that has passed through the convex lenses 631, 632, and 633 that form the relay lens system is incident on the total reflection prism 634 that has a minute gap 635 between the two glass blocks. The light incident on the total reflection prism 634 is reflected by the above-mentioned minute gap 635 and is incident on the DMD 636.

The DMD636 is driven by a video circuit (not shown), and the ON / OFF of each pixel is switched according to the image information to change the reflection direction.

The light emitted from the ON pixel of the DMD636 and incident on the total reflection prism is incident on the minute gap 635 of the total reflection prism at an angle equal to or less than the total reflection angle, is transmitted as it is, and is not shown by the projection lens 641. Enlarged projection on the screen.

[2-5] Effect According to Embodiment 2 According to the phosphor wheel device 100A according to the second embodiment, the substrate 101 has a phosphor 102a on a circumference having a first radius r1 from the center of rotation of the substrate 101. , 102b includes a phosphor region 108a, and a transmission region 102c on which no phosphor is formed. The substrate 101 has a ventilation region 103 including a plurality of openings closer to the rotation center of the substrate 101 than the phosphor region, and a heat transfer region 106 farther from the rotation center of the substrate 101 than the phosphor region 108a.

As a result, in the light source device 2A in which red, green, yellow, and blue light having a uniform intensity distribution is emitted from the rod integrator 518 in chronological order, the thermal conductivity of the substrate is lowered and the temperature of the phosphor is locally raised. It is possible to provide a phosphor wheel device that suppresses and has excellent heat dissipation characteristics as compared with the conventional case.

(Other embodiments)
As described above, Embodiments 1 and 2 have been described as examples of the techniques disclosed in the present application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. It is also possible to combine the components described in the first and second embodiments to form a new embodiment.

The heat transfer region may have at least one opening.

The substrate is not limited to a flat surface, and may have any shape including at least a part of bending or bending as long as it can generate fluorescent light in an appropriate direction.

The shape of the opening is not limited to a circle and a quadrangle, and may be any shape including an ellipse and other polygons.

As described above, an embodiment has been described as an example of the technique in the present disclosure. To that end, the accompanying drawings and detailed explanations have been provided.

Therefore, among the components described in the attached drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to exemplify the above technology. Can also be included. Therefore, the fact that those non-essential components are described in the accompanying drawings or detailed description should not immediately determine that those non-essential components are essential.

Further, since the above-described embodiment is for exemplifying the technique in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of claims or the equivalent scope thereof.

The phosphor wheel device of the present disclosure is applicable to a light source device and a projection type image display device.

1,1A phosphor wheel assembly 2 light source device 100, 100A phosphor wheel device 101 substrate 102, 102a, 102b phosphor 102c transmission area 103 ventilation area 104 first opening 105 second opening 106 heat transfer area 107 fin 110 rotation Axis 111 Motor 112 Cap 202 First laser light source 203 Collimator lens 204, 208, 209, 210 Convex lens 205 Diffuse plate 206 Concave lens 207 Dichroic mirror 211 Rod integrator 222 Second laser light source 223 Collimator lens 224 Convex lens 225 Diffuse plate 226 Concave lens,
331, 332, 333 Convex lens 334 Total internal reflection prism 335 Micro gap 336 Color prism 337 Micro gap 338, 339, 340, 636 DMD
341 Projection lens 502 First laser light source 503 Collimator lens 504, 508, 509, 510, 511, 516 Convex lens 505 Diffuse plate 506 Concave lens 507 Dichroic mirror 521, 513, 515 Mirror 514 Relay lens 517 Filter wheel 518 Rod integrator 631, 632 , 633 Convex lens 634 Total internal reflection prism 635 Micro gap 641 Projection lens

Claims (10)

With a rotating board
A phosphor wheel device comprising a phosphor region containing a phosphor provided on at least a part of a circumference having a first radius from the center of rotation of the substrate on the surface of the substrate.
The substrate is
A ventilation region including a plurality of openings closer to the center of rotation of the substrate than the phosphor region,
Than said phosphor region possess a heat transfer region remote from the rotational center of the substrate,
The plurality of openings
A plurality of first openings provided on a circumference having a second radius smaller than the first radius from the center of rotation of the substrate.
A plurality of second openings provided on a circumference having a third radius smaller than the second radius from the center of rotation of the substrate.
Fluorescent wheel device. The area of the heat transfer region is equal to or larger than the sum of the areas of the plurality of openings.
The fluorescent wheel device according to claim 1. The sum of the areas of the plurality of second openings is equal to or greater than the sum of the areas of the plurality of first openings.
The fluorescent wheel device according to claim 1. The plurality of first openings all have the same area and
The plurality of second openings all have the same area and
The area of each of the plurality of second openings is larger than the area of each of the plurality of first openings.
The fluorescent wheel device according to any one of claims 1 to 3. The plurality of first openings are all the same shape and have the same shape.
The plurality of second openings are all the same shape and have the same shape.
The shape of each of the plurality of second openings is different from the shape of each of the plurality of first openings.
The fluorescent wheel device according to any one of claims 1 to 4. A plurality of fins provided in the ventilation region of the substrate are further provided so as to generate an air flow from the ventilation region to the heat transfer region when the substrate is rotated.
The fluorescent wheel device according to any one of claims 1 to 5. The plurality of fins are provided on a circumference having the third radius from the center of rotation of the substrate.
The fluorescent wheel device according to claim 6. The substrate has a transmission region in which no phosphor is formed and light is transmitted on the circumference having the first radius from the center of rotation of the substrate.
The fluorescent wheel device according to any one of claims 1 to 7. The fluorescent wheel device according to any one of claims 1 to 8.
A drive device for rotating the phosphor wheel device and
An excitation light source that generates excitation light of a predetermined wavelength,
A light source device including a light guide optical system that guides the excitation light to the phosphor wheel device.
Fluorescent light is generated by irradiating the phosphor of the phosphor wheel device with the excitation light.
Light source device. The light source device according to claim 9 is provided.
Projection type image display device.

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