JP6937460B2 - Phosphor wheel, light source device and projection type image display device - Google Patents

Description

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

Patent Document 1 discloses a configuration of a phosphor wheel characterized in that a titanium oxide layer is provided on a substrate and a phosphor layer is provided on the titanium oxide layer. Such a phosphor wheel is a fluorescent light emitting plate having a fluorescent light emitting part arranged to face the excitation light source and a reflecting part containing titanium oxide arranged so as to be bonded to the fluorescent light emitting part on the opposite side of the excitation light source. be. Since the configuration has a reflecting portion, when the excitation light from the excitation light source is applied to the fluorescence emitting portion, the fluorescence emitting light is emitted from the fluorescence emitting portion, and the reflected fluorescence emitting light is emitted from the reflecting portion. .. Therefore, the utilization efficiency of the fluorescent emission light can be improved. Further, since the titanium oxide layer is provided on the substrate to form a reflective portion, cost reduction can be realized.

Japanese Unexamined Patent Publication No. 2013-228598

The present disclosure provides a phosphor wheel with good alignment accuracy between the phosphor layer and the substrate.

The phosphor wheel in the present disclosure is a phosphor wheel composed of a disk-shaped substrate and a phosphor ring adhesively fixed to the substrate, and has notches or openings at least three points on the peripheral edge of the substrate. Is provided, and the shortest length from the center of the substrate to the edge of the notch or opening is substantially the same as the radius of the outer peripheral edge of the phosphor ring.

According to the present disclosure, it is possible to provide a phosphor wheel having good alignment accuracy between the phosphor layer and the substrate.

FIG. 1A is a plan view showing a substrate according to the first embodiment. FIG. 1B is a side view showing the substrate according to the first embodiment. FIG. 2A is a plan view showing a state in which an adhesive layer is formed on the substrate according to the first embodiment. FIG. 2B is a side view showing a state in which an adhesive layer is formed on the substrate according to the first embodiment. FIG. 3A is a plan view showing a positioning jig according to the first embodiment. FIG. 3B is a side view showing the positioning jig according to the first embodiment. FIG. 4 is a plan view showing a state in which the substrate according to the first embodiment is attached to the positioning jig. FIG. 5A is a plan view showing the phosphor ring according to the first embodiment. FIG. 5B is a side view showing the phosphor ring according to the first embodiment. FIG. 6A is a plan view showing a state in which the substrate and the phosphor ring according to the first embodiment are attached to the positioning jig. FIG. 6B is an enlarged cross-sectional view taken along the line 6B-6B of FIG. 6A. FIG. 7A is a plan view showing the substrate according to the second embodiment. FIG. 7B is a side view showing the substrate according to the second embodiment. FIG. 8A is a plan view showing a state in which an adhesive layer is formed on the substrate according to the second embodiment. FIG. 8B is a side view showing a state in which an adhesive layer is formed on the substrate according to the second embodiment. FIG. 9 is a plan view showing a state in which the substrate according to the second embodiment is attached to the positioning jig. FIG. 10A is a plan view showing the phosphor ring according to the second embodiment. FIG. 10B is a side view showing the phosphor ring according to the second embodiment. FIG. 11A is a plan view showing a state in which the substrate and the phosphor ring according to the second embodiment are attached to the positioning jig. FIG. 11B is an enlarged cross-sectional view taken along the line 11B-11B of FIG. 11A. FIG. 12 is a diagram showing a configuration of a light source device provided with a phosphor wheel according to the first embodiment. FIG. 13 is a diagram showing a configuration of a projection type image display device including the light source device according to the first embodiment.

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 accompanying drawings and the following description are provided for 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 and Manufacturing Method of Fluorescent Wheel The fluorescent wheel according to the first embodiment will be described with reference to FIGS. 1A to 6B.

FIG. 1A is a plan view showing the substrate 101 according to the first embodiment. FIG. 1B is a side view showing the substrate 101 according to the first embodiment. The substrate 101 used in the phosphor wheel 111 (see FIG. 6A) according to the first embodiment has a disk shape made of aluminum, and the rotation shaft of the motor 112 (see FIG. 12) is attached to the center O thereof. The mounting holes 102 are opened, and the substrate 101 is rotationally driven by the motor 112. Notches 103 are provided at three locations on the peripheral edge of the substrate 101 at an angle of θ = 120 ° along the circumferential direction. Here, the shortest length from the center O of the substrate 101 to the edge of the notch 103 is defined as the length R1. In the first embodiment, the length from the center O to the inner edge 103a of the notch 103 corresponds to the length R1. Further, on at least one surface of the substrate 101, a retroreflective film layer 104 composed of an undercoat and a topcoat (not shown) is formed in order to improve the surface diffuse reflectance.

FIG. 2A is a plan view showing a state in which the adhesive layer 105 is formed on the substrate 101 according to the first embodiment. FIG. 2B is a side view showing a state in which the adhesive layer 105 is formed on the substrate 101 according to the first embodiment.

On the hyperreflective film layer 104, as shown in FIGS. 2A and 2B, a ring-shaped adhesive layer 105 having a predetermined width is formed on a circumference having the same length from the center O of the substrate 101. The width D1 shown in FIG. 2A is the width of the adhesive layer 105 in the radial direction, and corresponds to the above-mentioned predetermined width. To form the adhesive layer 105, for example, a coating nozzle (not shown) is placed on the substrate 101 at a position where the adhesive layer 105 is desired to be formed, and the substrate 101 is coated while rotating with the center O as the center of rotation. Discharge the adhesive from the nozzle. As a result, a ring-shaped adhesive layer 105 having a predetermined width can be formed on a circumference having the same length from the center O of the substrate 101. The adhesive contains particles 107 (see FIG. 6B) in the resin silicone 106 (see FIG. 6B) that increase the diffuse reflectance and thermal conductivity.

As a material used for the adhesive forming the adhesive layer 105, the strain caused by the difference in the coefficient of thermal expansion between the substrate 101 and the phosphor ring 108 (see FIG. 5A), which is the phosphor layer, is buffered and the phosphor wheel is used. It is desirable to use resin silicone to maintain the configuration of 111. Further, from the viewpoint of cushioning strain, it is desirable to use a dimethyl-based resin silicone as the resin silicone used for the adhesive.

FIG. 3A is a plan view showing the positioning jig 500 according to the first embodiment. FIG. 3B is a side view showing the positioning jig 500 according to the first embodiment. In the positioning jig 500, three positioning pins 502 are arranged on the base 501. These positioning pins 502 are arranged at positions where they come into contact with the inner edge 103a of the notch 103. FIG. 4 is a plan view showing a state in which the substrate 101 according to the first embodiment is attached to the positioning jig 500. The substrate 101 on which the adhesive layer 105 is formed is attached to the positioning jig 500 as shown in FIG.

FIG. 5A is a plan view showing the phosphor ring 108 according to the first embodiment. FIG. 5B is a side view showing the phosphor ring 108 according to the first embodiment. FIG. 6A is a plan view showing a state in which the substrate 101 and the phosphor ring 108 according to the first embodiment are attached to the positioning jig 500. FIG. 6B is an enlarged cross-sectional view taken along the line 6B-6B of FIG. 6A. As shown in FIG. 6B, the phosphor ring 108 is composed of phosphor particles 109 and a binder 110 which is a mixture. The phosphor particles 109 are excited by the excitation light and emit fluorescence. As shown in FIG. 5A, the phosphor ring 108 is formed in advance in a ring shape so that the radius of the outer peripheral edge 108a is the radius P1, the radius of the inner peripheral edge 108b is the radius P2, and the width in the radial direction is the length of the width P3. ..

As the binder 110, an inorganic substance having high thermal conductivity, for example, a mixture containing alumina as a main component is desirable. Alumina has a thermal conductivity 10 times or more that of dimethyl-based silicone, and the phosphor ring 108 is composed of phosphor particles 109 and a binder 110 which is a mixture containing alumina as a main component. Thereby, a phosphor ring 108 (fluorescent layer) having a high thermal conductivity can be realized.

As can be seen from FIGS. 1A, 5A and 6A, the shortest length R1 from the center O of the substrate 101 to the edge 103a of the notch 103 and the radius P1 of the outer peripheral edge 108a of the phosphor ring 108 substantially coincide with each other. .. The term "substantially matching" as used herein means that the length R1 and the radius P1 are equal (R1 = P1), or the length R1 is larger than the radius P1 (R1> P1). Further, in the first embodiment, the width D1 of the adhesive layer 105 is slightly wider than the width P3 of the phosphor ring 108, but the width may be the same.

In this way, the phosphor ring 108 is arranged so that its outer peripheral edge 108a abuts on the positioning pin 502, as shown in FIG. 6A. As a result, the phosphor ring 108 is placed at a predetermined position on the adhesive layer 105 formed on the reflective film layer 104 of the substrate 101 (a region having a length P2 or more and a length P1 or less in the radial direction from the center O of the substrate 101). ) Will be placed. After the phosphor ring 108 is arranged, the adhesive is cured by heat, and the phosphor ring 108 is adhered and fixed to the substrate 101 to form a phosphor wheel 111. That is, the phosphor wheel 111 is composed of a substrate 101, a reflective film layer 104, an adhesive layer 105, and a phosphor ring 108 which is a phosphor layer. Then, by mounting the rotation shaft of the motor 112 in the mounting hole 102 of the phosphor wheel 111, the phosphor wheel 111 is rotationally driven to be configured as the phosphor wheel device 1.

In the first embodiment, three notches 103 are provided, but the present invention is not limited to this, and at least three notches 103 may be provided. Therefore, four or more notches 103 are provided. May be good. The position of the notch 103 may be any position as long as the rotation of the phosphor wheel 111 can be balanced, and is not limited to the 120 ° interval. Further, in the first embodiment, the notch 103 is provided on the peripheral edge of the substrate 101, but an opening may be provided on the peripheral edge. If the opening is provided so that the shortest length from the center O of the substrate 101 to the edge of the opening and the radius P1 of the outer peripheral edge 108a of the phosphor ring 108 substantially coincide with each other, the case where the notch 103 is provided A similar effect can be obtained.

Further, the substrate 101 may be any metal having good heat dissipation, and is not limited to aluminum. Examples of materials other than aluminum include ceramic materials such as glass and alumina, and metal materials such as copper and stainless steel. Further, the adhesive layer 105 may be formed by screen printing instead of the method of forming with the coating nozzle.

[1-2] Effect In assembling the phosphor wheel according to the first embodiment, when the phosphor ring 108 is adhered to the substrate 101, first, the substrate 101 provided with the adhesive layer 105 is cut out from the substrate 101. The positioning pin 502 is provided through the notch 103 on the base 501 provided with the positioning pin 502 corresponding to the portion 103. After that, the outer peripheral edge 108a of the phosphor ring 108 is aligned and adhered so that the positioning pin 502 is in contact with the outer peripheral edge 108a.

By doing so, it becomes possible to bond the substrate 101 and the phosphor ring 108 in a state of being aligned at a predetermined position, and to bond the phosphor ring 108 which is a phosphor layer and the substrate 101. It is possible to improve the alignment accuracy when performing. As a result, the center of rotation of the substrate 101 and the phosphor ring 108 are aligned with each other, and it is possible to bond the substrate 101 in a state where the balance during rotation is adjusted.

(Embodiment 2)
[2-1] Configuration and Manufacturing Method of Fluorescent Wheel The fluorescent wheel according to the second embodiment will be described with reference to FIGS. 7A to 11B.

FIG. 7A is a plan view showing the substrate 201 according to the second embodiment. FIG. 7B is a side view showing the substrate 201 according to the second embodiment. The substrate 201 used in the phosphor wheel 211 (see FIG. 11A) according to the second embodiment has a disk shape made of aluminum, and the rotation shaft of the motor 112 (see FIG. 12) is attached to the center O2 thereof. The mounting hole 202 is opened, and the substrate 201 is rotationally driven by the motor 112. The substrate 201 is provided with openings 203 at three locations at an angle of θ = 120 ° along the circumferential direction. Here, the longest length from the center O2 of the substrate 201 to the edge of the opening 203 is defined as the length R2. In the second embodiment, the length from the center O2 to the outer edge 203a of the opening 203 corresponds to the length R2. Further, on at least one surface of the substrate 201, a retroreflective film layer 204 composed of an undercoat and a topcoat (not shown) is formed in order to improve the surface diffuse reflectance.

FIG. 8A is a plan view showing a state in which the adhesive layer 205 is formed on the substrate 201 according to the second embodiment. FIG. 8B is a side view showing a state in which the adhesive layer 205 is formed on the substrate 201 according to the second embodiment.

On the hyperreflective film layer 204, as shown in FIGS. 8A and 8B, a ring-shaped adhesive layer 205 having a predetermined width is formed on a circumference having the same length from the center O2 of the substrate 201. The width D2 shown in FIG. 8A is the width of the adhesive layer 205 in the radial direction, and corresponds to the above-mentioned predetermined width. To form the adhesive layer 205, for example, a coating nozzle (not shown) is arranged at a position on the substrate 201 where the adhesive layer 205 is desired to be formed, and the substrate 201 is coated while rotating with the center O2 as the center of rotation. Discharge the adhesive from the nozzle. As a result, a ring-shaped adhesive layer 205 having a predetermined width can be formed on the circumference having the same length from the center O2 of the substrate 201. The adhesive contains contained particles 207 (see FIG. 11B) in the resin silicone 206 (see FIG. 11B) that increase the diffuse reflectance and thermal conductivity.

As a material used for the adhesive forming the adhesive layer 205, the strain caused by the difference in the coefficient of thermal expansion between the substrate 201 and the phosphor ring 208 (see FIG. 10A), which is the phosphor layer, is buffered and the phosphor wheel is used. It is desirable to use resin silicone to maintain the configuration of 211. Further, from the viewpoint of cushioning strain, it is desirable to use a dimethyl-based resin silicone as the resin silicone used for the adhesive.

Also in the second embodiment, the positioning jig 500 including the base 501 and the positioning pin 502 as shown in FIG. 3A is used. The positioning jig 500 is arranged at a position where the positioning pin 502 abuts on the outer edge 203a of the opening 203 so that it can be applied to the second embodiment. FIG. 9 is a plan view showing a state in which the substrate 201 according to the second embodiment is attached to the positioning jig 500. The substrate 201 on which the adhesive layer 205 is formed is attached to the positioning jig 500 as shown in FIG.

FIG. 10A is a plan view showing the phosphor ring 208 according to the second embodiment. FIG. 10B is a side view showing the phosphor ring 208 according to the second embodiment. FIG. 11A is a plan view showing a state in which the substrate 201 and the phosphor ring 208 according to the second embodiment are attached to the positioning jig 500. FIG. 11B is an enlarged cross-sectional view taken along the line 11B-11B of FIG. 11A. As shown in FIG. 11B, the phosphor ring 208 is composed of phosphor particles 209 and a binder 210 which is a mixture. The phosphor particles 209 are excited by the excitation light and emit fluorescence. As shown in FIG. 10A, the phosphor ring 208 is formed in advance in a ring shape so that the radius of the outer peripheral edge 208a is the radius P1, the radius of the inner peripheral edge 208b is the radius P2, and the width in the radial direction is the width P3.

As the binder 210, an inorganic substance having high thermal conductivity, for example, a mixture containing alumina as a main component is desirable. Alumina has a thermal conductivity 10 times or more that of dimethyl-based silicone, and the phosphor ring 208 is composed of phosphor particles 209 and a binder 210 which is a mixture containing alumina as a main component. Thereby, a phosphor ring 208 (fluorescent layer) having a high thermal conductivity can be realized.

As can be seen from FIGS. 7A, 10A and 11A, the longest length R2 from the center O2 of the substrate 201 to the edge 203a of the opening 203 and the radius P2 of the inner peripheral edge 208b of the phosphor ring 208 substantially coincide with each other. .. The term "substantially matching" as used herein means that the length R2 and the radius P2 are equal (R2 = P2), or the length R2 is smaller than the radius P2 (R2 <P2). Further, in the second embodiment, the width D2 of the adhesive layer 205 is slightly wider than the width P3 of the phosphor ring 208, but the width may be the same.

In this way, the phosphor ring 208 is arranged so that its inner peripheral edge 208b abuts on the positioning pin 502, as shown in FIG. 11A. As a result, the phosphor ring 208 is arranged at a predetermined position on the adhesive layer 205 formed on the reflective film layer 204 of the substrate 201 (a region having a length P2 or more and P1 or less in the radial direction from the center O2 of the substrate 201). Will be done. After the phosphor ring 208 is arranged, the adhesive is cured by heat, and the phosphor ring 208 is adhered and fixed to the substrate 201 to form the phosphor wheel 211. That is, the phosphor wheel 211 is composed of a substrate 201, a reflective film layer 204, an adhesive layer 205, and a phosphor ring 208 which is a phosphor layer. Then, by attaching the rotation shaft of the motor 112 to the mounting hole 202 of the phosphor wheel 211, the phosphor wheel 211 is rotationally driven to be configured as the phosphor wheel device 10.

In the second embodiment, three openings 203 are provided, but the present invention is not limited to this, and at least three openings 203 may be provided. Therefore, as a configuration in which four or more openings 203 are provided. May be good. The position of the opening 203 may be any position as long as the rotation of the phosphor wheel 211 can be balanced, and is not limited to the 120 ° interval.

Further, the material of the substrate 201 may be any metal having good heat dissipation, and is not limited to aluminum. Examples of materials other than aluminum include ceramic materials such as glass and alumina, and metal materials such as copper and stainless steel. Further, the adhesive layer 205 may be formed by screen printing instead of the method of forming with the coating nozzle.

[2-2] Effect In assembling the phosphor wheel according to the second embodiment, when the phosphor ring 208 is adhered to the substrate 201, first, the substrate 201 provided with the adhesive layer 205 is opened through the substrate 201. The positioning pin 502 is arranged through the opening 203 on the base 501 provided with the positioning pin 502 corresponding to the portion 203. After that, the inner peripheral edge 208b of the phosphor ring 208 is aligned and adhered so that the positioning pin 502 is in contact with the inner peripheral edge 208b.

By doing so, the substrate 201 and the phosphor ring 208 can be adhered to each other in a state of being aligned at a predetermined position, and the phosphor layer 208 and the substrate 201 are adhered to each other. The alignment accuracy can be improved. As a result, the center of rotation of the substrate 201 and the phosphor ring 208 are aligned with each other, and it is possible to bond the substrate 201 with the balance during rotation adjusted.

[3-1] Light Source Device Using Phosphor Wheel FIG. 12 is a diagram showing a configuration of a light source device 3 provided with the phosphor wheel 111 according to the first embodiment. Although the light source device 3 can be configured by using the phosphor wheel 211 of the second embodiment, the phosphor wheel 111 of the first embodiment will be described here for convenience. Therefore, the phosphor wheel device 1 includes a phosphor wheel 111 and a motor 112 that rotationally drives the phosphor wheel 111.

The light emitted from the plurality of first lasers 302 is collimated by the collimator lens 303 arranged on the emitting side of each of the first lasers 302. On the exit side of the collimator lens 303, a convex lens 304 that collects the light of the first laser 302 emitted from the plurality of collimator lenses 303 and reduces the luminous flux width is provided. Further, the convex lens 304 also has a function of eliminating the density of the light flux emitted from the first laser 302 generated in the state of passing through the collimator lens 303. The emitted light whose luminous flux width is reduced by the convex lens 304 is incident on the diffuser plate 305 located on the exit side of the convex lens 304. The diffuser plate 305 eliminates the density of the luminous flux that could not be eliminated by the convex lens 304. Here, the first laser 302 is an example of an excitation light source.

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

The parallelized light emitted from the concave lens 306 is incident on the dichroic mirror 307 arranged on the exit side at an angle of 45 degrees with respect to the optical axis. The dichroic mirror 307 has a property of transmitting light in the wavelength range of the emitted light of the first laser 302 and reflecting light in the wavelength range of fluorescence from the phosphor wheel 111, which will be described later. Therefore, the light from the concave lens 306 incident on the dichroic mirror 307 is transmitted, and by sequentially incident on the plurality of convex lenses 308 and 309, the luminous flux is converged and incident on the phosphor wheel 111.

The phosphor wheel 111 is arranged so that the phosphor ring 108, which is a phosphor layer, faces the convex lenses 308 and 309. At the same time, as shown in FIG. 6A, the phosphor wheel 111 has a phosphor ring 108 which is a phosphor layer on a circumference having the same length from the center of rotation of the phosphor wheel 111. The phosphor ring 108 is irradiated with the light of the first laser 302 converged by the convex lenses 308 and 309 in time series as the phosphor wheel 111 rotates. Here, the collimator lens 303, the convex lens 304, the diffuser 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 laser 302 incident on the phosphor ring 108, which is the phosphor layer, excites the phosphor particles 109 in the phosphor layer. The excited phosphor particles 109 emit fluorescence in a wavelength range different from the wavelength of the first laser 302 toward the convex lens 309. The fluorescence incident on the convex lens 309 is emitted to the convex lens 308 side, then is incident on the convex lens 308, is collimated, is emitted to the dichroic mirror 307 side, and is incident on the dichroic mirror 307.

As described above, the dichroic mirror 307 is arranged at an angle of 45 degrees with respect to the optical axis of fluorescence, transmits light in the wavelength range of the emitted light of the first laser 302, and fluoresces from the phosphor wheel 111. It has the property of reflecting light in the wavelength range of. Therefore, the fluorescence incident on the dichroic mirror 307 is bent 90 degrees in the traveling direction.

Next, the light emitted from the plurality of second lasers 322 is collimated by the collimator lens 323 arranged on the emitting side of each of the second lasers 322. On the exit side of the collimator lens 323, a convex lens 324 that collects the light of the second laser 322 emitted from the plurality of collimator lenses 323 and reduces the luminous flux width is provided. Further, the convex lens 324 also has a function of eliminating the density of the light flux emitted from the second laser 322 generated in the state of passing through the collimator lens 323. The emitted light whose luminous flux width is reduced by the convex lens 324 is incident on the diffuser plate 325 located on the emission side of the convex lens 324. The diffuser plate 325 eliminates the density of the luminous flux that could not be eliminated by the convex lens 324.

The light emitted from the diffuser plate 325 is incident on the concave lens 326. The concave lens 326 converts the light incident from the diffuser plate 325 into parallel light.

The parallel light emitted from the concave lens 326 is incident on the dichroic mirror 307 arranged on the exit side at an angle of 45 degrees with respect to the optical axis from a direction 90 degrees different from the fluorescence emitted from the phosphor wheel 111. do. The dichroic mirror 307 has a property of transmitting light in the wavelength range of the emitted light of the second laser 322 and reflecting light in the wavelength range of fluorescence from the phosphor wheel 111. 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 111 and the light emitted from the second laser 322 are emitted in the same direction.

The fluorescence from the phosphor wheel 111 and the laser light from the second laser 322 are converged by the convex lens 310 and incident on the rod integrator 311 which is a light equalizing means. The intensity distribution of the light emitted from the rod integrator 311 is uniform.

Here, the light emitted by the second laser 322 is light in the blue wavelength region, and the light emitted by the first laser 302 is light in the ultraviolet to blue wavelength region. Further, the phosphor particles 109 contained in the phosphor ring 108 of the phosphor wheel 111 are excited by light in the wavelength region of the first laser 302, and emit yellow fluorescence including both green and red wavelength regions. ..

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

[3-2] Projection-type image display device including a light source device using a phosphor wheel FIG. 13 is a diagram showing a configuration of a projection-type image display device including the light source device 3 according to the first embodiment.

The projection type image display device includes the light source device 3 described with reference to FIG. Regarding the details of the light source device 3, the overlapping description will be omitted, and the behavior of the white light emitted from the rod integrator 311 and the configuration of the projection type image display device will be described.

First, the white light emitted from the rod integrator 311 is a relay lens system composed of three lenses 331, 332, and 333. Map the exit surface.

The light that has passed through the 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 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. It reflects and is totally reflected by 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, yellow light including light in both the red and green regions that have passed through the minute gap 337 of the color prism is provided at the interface 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 on the second glass block. It is transmitted and 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. It is reflected by this and is incident on the DMD339 for red.

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 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 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 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.

The present disclosure is applicable to a lighting device of a projection type image display device.

1,10 Fluorescent wheel device 101,201 Board 102,202 Mounting hole 103 Notch 103a Inner edge (edge)
104,204 Anti-reflective film layer 105, 205 Adhesive layer 106, 206 Resin silicone 107, 207 Containing particles 108, 208 Fluorescent ring 109, 209 Fluorescent particles 110, 210 Binder 111,211 Fluorescent wheel 112 Motor 203 Opening 203a Outer edge (edge)
3 Light source device 302 First laser 303 Collimator lens 304 Convex lens 305 Diffuse plate 306 Concave lens 307 Dichroic mirror 308, 309, 310 Convex lens 311 Rod integrator 322 Second laser 323 Collimator lens 324 Convex lens 325 Diffuse plate 332 Lens 338, 339, 340 DMD
334 Total reflection prism 335, 337 Micro gap 336 Color prism 341 Projection lens 500 Positioning jig 501 Base 502 Positioning pin D1, D2 Radial width (width) of adhesive layer
Radius of the outer periphery of P1 (radius)
Radius of the inner periphery of P2 (radius)
Radial width (width) of P3 phosphor ring
R1 Shortest length (length)
R2 longest length (length)

Claims (4)

A phosphor wheel consisting of a disk-shaped substrate and a phosphor ring that is adhered and fixed to this substrate.
The peripheral edge of the substrate is provided with at least three notches or openings, the shortest length from the center of the substrate to the edge of the notch or opening, and the outer peripheral edge of the phosphor ring. A fluorescent wheel with a radius that is approximately the same. A phosphor wheel consisting of a disk-shaped substrate and a phosphor ring that is adhered and fixed to this substrate.
The substrate is provided with openings at at least three locations along the circumferential direction, and the longest length from the center of the substrate to the edge of the openings and the radius of the inner peripheral edge of the phosphor ring are defined. Fluorescent wheel that almost matches. Excitation light source and
A light guide optical system that guides the emitted light from the excitation light source,
The phosphor wheel according to claim 1 or 2 is provided.
A light source device that emits fluorescence by irradiating the phosphor ring of the phosphor wheel with excitation light from the light guide optical system. A projection type image display device including the light source device according to claim 3.

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