Light source device and projection device

Abstract

A light source device and a projection device equipped with the light source device are provided, which can reduce color unevenness while achieving device miniaturization. The light source device includes: an excitation light irradiation device (70) that emits excitation light; a rotating wheel device (100) that includes a rotating wheel (101) that includes a filter region (104) through which light of a predetermined wavelength different from the excitation light is reflected or transmitted and through which the excitation light is transmitted, and a transmission bending region (106) through which the excitation light is bent and transmitted; and a fixed phosphor (200) that is irradiated by the excitation light of the transmission filter region (104) and emits fluorescence containing light of a predetermined wavelength toward the filter region (104), wherein the rotating wheel device (100) is configured such that the optical axis of the excitation light transmitted through the rotating wheel (101) or reflected by the rotating wheel (101) overlaps with the optical axis of the fluorescence of the predetermined wavelength of the filter region (104) reflected or transmitted by the filter region (104).

Description

[0001] This application claims priority based on Japanese Patent Application No. 2021-149570, filed on September 14, 2021, and incorporates the entire contents of that basic application into this application. Technical Field

[0002] This disclosure relates to light source devices and projection devices. Background Technology

[0003] Today, projection devices are used to project images or videos from personal computers, image data stored on memory cards, etc., onto a screen. These devices focus light emitted from a light source onto a micromirror display element or liquid crystal panel called a DMD (Digital Micromirror Device), displaying a color image on the screen.

[0004] For example, Japanese Patent Application Publication No. 2020-160149 discloses a light source device comprising a light source with blue band light (first band light), a phosphor wheel, a dichroic mirror, a color wheel, and a control unit. The color wheel includes: a blue-red transmission region that selects a portion of the longer wavelength side of red band light (second band light) and green band light (third band light) synthesized by the dichroic mirror as a fourth band light; and a full-color transmission region. The control unit synchronously controls the phosphor wheel and the color wheel, and controls the shifting of the synchronous position of the color wheel relative to the phosphor wheel according to the output mode.

[0005] However, in light source devices such as those described in Japanese Patent Application Publication No. 2020-160149, which are equipped with not only a phosphor wheel and a color wheel but also a dichroic mirror, sometimes the optical path of the blue wavelength light used as excitation light and the optical path of light of a different wavelength are different. In this case, the following situations are anticipated: the device becomes larger, and color unevenness occurs due to errors caused by the different optical paths. Summary of the Invention

[0006] This disclosure was made in view of the above circumstances, and its purpose is to provide a light source device and a projection device having the light source device that can reduce the occurrence of color unevenness while realizing the miniaturization of the device.

[0007] The light source device of the present invention is characterized by comprising: an excitation light irradiation device that emits excitation light; a rotating wheel device that includes a rotating wheel comprising: a filtering region that reflects or transmits light of a predetermined wavelength band different from the excitation light and transmits the excitation light; a transmission bending region that bends and transmits the excitation light; and a fluorescence emitting device that, when irradiated by the excitation light transmitted through the filtering region, emits fluorescence containing light of the predetermined wavelength band toward the filtering region, wherein the rotating wheel device is configured such that the optical axis of the excitation light transmitted through or reflected by the rotating wheel overlaps with the optical axis of the fluorescence of the predetermined wavelength band reflected or transmitted through the filtering region.

[0008] The projection apparatus disclosed herein is characterized by comprising: the aforementioned light source device; a display element that generates image light; a projection optical system that projects the image light emitted from the display element onto a projected object; and a control unit that controls the light source device and the display element.

[0009] According to this disclosure, a light source device and a projection device equipped with the light source device can be provided that can reduce color unevenness while achieving miniaturization of the device. Attached Figure Description

[0010] Figure 1 This is a diagram showing the functional circuit modules of the projection device according to the first embodiment.

[0011] Figure 2 This is a top view schematic diagram showing the internal structure of the projection device according to the first embodiment.

[0012] Figure 3A This is a schematic diagram showing the rotating wheel device of the first embodiment, and is a top view of the rotating wheel.

[0013] Figure 3B It is shown Figure 3A A schematic diagram of the cross-section IIIb-IIIb.

[0014] Figure 4A It is Figure 3B A cross-sectional schematic diagram of the rotating wheel device, enlarged from the portion enclosed by the dashed line.

[0015] Figure 4B It is by Figure 4A A cross-sectional schematic diagram of a partial deformed example is shown.

[0016] Figure 4C It is by Figure 4A A cross-sectional schematic diagram of another variation of the portion shown.

[0017] Figure 5This is a top view schematic diagram showing the internal structure of the projection device in a modified example of the first embodiment.

[0018] Figure 6 This is a top view schematic diagram showing the case where the excitation light irradiating the rotating wheel device in the first embodiment is transmitted through the rotating wheel device.

[0019] Figure 7 This is a top view schematic diagram showing the situation in which the excitation light irradiated by the rotating wheel device in the first embodiment is reflected by the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0020] Figure 8 This is a top view schematic diagram showing the case where the excitation light irradiating the rotating wheel device in the second embodiment is transmitted through the rotating wheel device and the case where the excitation light irradiating the rotating wheel device is reflected by the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0021] Figure 9A This is a magnified cross-sectional diagram of the reflective bending area of ​​the rotating wheel device.

[0022] Figure 9B It is by Figure 9A A cross-sectional schematic diagram of a partial deformed example is shown.

[0023] Figure 9C It is by Figure 9A A cross-sectional schematic diagram of another variation of the portion shown.

[0024] Figure 10 This is a top view schematic diagram showing the case where the excitation light irradiating the rotating wheel device in the third embodiment is transmitted through the rotating wheel device and the case where the excitation light irradiating the rotating wheel device is reflected by the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0025] Figure 11 This is a top view of the rotating wheel in the third embodiment.

[0026] Figure 12 This is a top view schematic diagram showing the internal structure of the projection device according to the fourth embodiment.

[0027] Figure 13A This is a schematic diagram showing the rotating wheel device of the fourth embodiment, and is a top view of the rotating wheel. Figure 13B It is shown Figure 13A A schematic diagram of the cross-section XIIIb-XIIIb.

[0028] Figure 14A It is Figure 13B A cross-sectional schematic diagram of the rotating wheel device, enlarged from the portion enclosed by the dashed line.

[0029] Figure 14B It is by Figure 14A A cross-sectional schematic diagram of a partial deformed example is shown.

[0030] Figure 15 This is a top view schematic diagram showing the case where the excitation light irradiating the rotating wheel device in the fourth embodiment is transmitted through the rotating wheel device in a bent manner.

[0031] Figure 16 This is a top view schematic diagram showing the situation in which the excitation light irradiating the rotating wheel device in the fourth embodiment passes through the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0032] Figure 17 This is a top view schematic diagram showing the case where the excitation light irradiating the rotating wheel device in the fifth embodiment passes through the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0033] Figure 18 This is a top view schematic diagram showing the case where the excitation light irradiated by the rotating wheel device in the sixth embodiment is reflected by the rotating wheel device, and the case where the excitation light irradiated by the rotating wheel device is transmitted through the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0034] Figure 19A This is an enlarged cross-sectional schematic diagram of a portion of the rotating wheel device of the sixth embodiment.

[0035] Figure 19B This is an enlarged cross-sectional schematic diagram of another part of the rotating wheel device in the sixth embodiment. Detailed Implementation

[0036] (First Embodiment)

[0037] The following is for reference Figures 1 to 7 The first embodiment of this disclosure will be described below. Figure 1 This is a functional circuit block diagram of the projection device 10. The projection device control unit includes: a CPU containing an image conversion unit 23 and a control unit 38, a front-end unit containing an input / output interface 22, a display encoder 24, and a display driver unit 26, etc. Various image signals of different specifications input from the input / output connector unit 21 are converted in the image conversion unit 23 via the input / output interface 22 and the system bus SB, and then unified into a specified format image signal suitable for display before being output to the display encoder 24.

[0038] In addition, after the display encoder 24 expands the input image signal and stores it in the video RAM 25, it generates a video signal based on the stored content of the video RAM 25 and outputs it to the display driver unit 26.

[0039] The display driving unit 26 drives the display element 50, which is a spatial light modulation element (SOM), at an appropriate frame rate in accordance with the image signal output from the display encoder 24. In one embodiment, the display element 50 is a DMD (digital micromirror device). The projection device 10 illuminates the display element 50 with a light beam emitted from the light source device 60 via a light guiding optical system, thereby forming an optical image from the reflected light of the display element 50, which is then projected via the projection optical system 220 (see reference 220). Figure 2 The projection optical system 220 projects an image onto a screen or other projection surface (not shown). Furthermore, the movable lens group 235 of the projection optical system 220 can be driven by the lens motor 45 for zoom and focus adjustments.

[0040] Furthermore, the image compression / decompression unit 31 performs the following recording processing: it compresses the luminance and chrominance signals of the image signal using ADCT and Huffman coding, and sequentially writes them to the memory card 32, which is a removable recording medium. Then, in playback mode, the image compression / decompression unit 31 reads the image data recorded in the memory card 32, decompresses each image data constituting a series of moving images in frame units, and outputs it to the display encoder 24 via the image conversion unit 23. Thus, the image compression / decompression unit 31 can output moving images and the like based on the image data stored in the memory card 32.

[0041] The control unit 38 is responsible for the operation control of various circuits within the projection device 10, including the CPU, the ROM that stores various settings and other operation programs, and the RAM used as working memory.

[0042] The key / indicator unit 37 includes a main key and an indicator, etc., provided in the housing. The operation signals of the key / indicator unit 37 are directly sent to the control unit 38. In addition, key operation signals from the remote control are received by the Ir receiver 35, demodulated into code signals by the Ir processing unit 36, and output to the control unit 38.

[0043] The control unit 38 is connected to the sound processing unit 47 via the system bus SB. The sound processing unit 47 has sound source circuits such as a PCM sound source, and converts the sound data into analog in projection mode and playback mode to drive the speaker 48 for sound amplification and playback.

[0044] The control unit 38 controls the light source control circuit 41. The light source control circuit 41 controls the excitation light irradiation device 70 and the rotating wheel device 100 of the light source device 60 (see reference). Figure 2The operation of the light source device 60 is controlled individually so that light of the specified wavelength required for generating an image is emitted from the light source device 60.

[0045] Furthermore, the control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature using multiple temperature sensors installed in the light source device 60, etc., and controls the rotation speed of the cooling fan 81 based on the temperature detection results. In addition, the control unit 38 also performs the following controls: causes the cooling fan drive control circuit 43 to continue rotating the cooling fan 81 after the power to the main body of the projection device 10 is turned off by using a timer or the like; or turns off the power to the main body of the projection device 10 based on the temperature detection results of the temperature sensors, etc.

[0046] Next, the internal structure of the projection device 10 will be described. Figure 2 This is a top view schematic diagram showing the internal structure of the projection device 10. Here, the housing of the projection device 10 is formed in a generally box shape, and includes a top panel and a bottom panel (not shown), a front panel 12, a rear panel 13, a right side panel 14, and a left side panel 15. Furthermore, in the following description, "left and right" of the projection device 10 refers to the left-right direction relative to the projection direction from the projection port 12a, and "front and back" of the projection device 10 refers to the front-back direction relative to the direction of the projected object and the direction of the beam's travel.

[0047] The projection device 10 has a control circuit board 242 near the left side panel 15. The control circuit board 242 includes a power supply circuit module, a light source control module, etc. In addition, the projection device 10 includes: a light source device 60, which is disposed in the approximately central part of the projection device 10; a light source optical system 170, which is disposed to the left of the light source device 60; and a projection optical system 220, which is disposed between the light source optical system 170 and the control circuit board 242.

[0048] The light source device 60 includes: an excitation light irradiation device 70, which is both a source of blue-band light (first-band light) and a source of excitation light; a red-green light source device 80, which is a source of red-band light (third-band light) and green-band light (fourth-band light); a rotating wheel device 100; and a fixed phosphor 200 (fluorescent emission device). The red-green light source device 80 includes the excitation light irradiation device 70, the rotating wheel device 100, and the fixed phosphor 200. In addition, the light source device 60 is equipped with: a light guiding optical system 140, which guides the excitation light reflected by the rotating wheel device 100 to the side of the fixed phosphor 200 and guides the fluorescence emitted from the fluorescent emission region 202 of the fixed phosphor 200 to the side of the rotating wheel device 100; and a light source optical system 170, which guides the light transmitted through the rotating wheel device 100.

[0049] The excitation light irradiation device 70 can be positioned anywhere; in this embodiment, it is positioned near the center of the projection device 10 on the front panel 12 side. The excitation light irradiation device 70 is held by a common holding member and includes a plurality of blue laser diodes 71 (excitation light sources) serving as semiconductor light-emitting elements, and a collimating lens 73. The plurality of blue laser diodes 71 are arranged in a matrix. A cooling fan 81 is provided on the front panel 12 side of the blue laser diodes 71 to cool the blue laser diodes 71 and the rotating wheel device 100.

[0050] Collimating lenses 73 are respectively disposed on the optical axis of each blue laser diode 71, converting the emitted light from the blue laser diode 71 into parallel light to improve its directivity. Each collimating lens 73 is configured such that it is offset from the central side of the corresponding blue laser diode 71 in a matrix arrangement relative to the optical axis of the blue laser diode 71. The blue wavelength light emitted from each blue laser diode 71 becomes a beam confined within a specified range by the collimating lens 73. Furthermore, optical components such as condensing lenses may be disposed in the optical path between the collimating lens 73 and the rotating wheel device 100 to focus the blue wavelength light emitted from each blue laser diode 71 via each collimating lens 73.

[0051] Furthermore, in this embodiment, an example is shown where a collimating lens 73 is arranged on the optical axis of the blue laser diode 71; however, an optical fiber or the like can also be arranged on the optical axis of the blue laser diode 71. In this case, the excitation light irradiation device 70 also includes an optical fiber, with the incident portion of the optical fiber arranged on the optical axis of each blue laser diode 71, and the exit portion of the optical fiber arranged toward the rotating wheel device 100. When using the above-described optical fiber, the arrangement of each blue laser diode 71 is not limited to... Figure 2 The location of the blue laser diodes 71. In one embodiment, each blue laser diode 71 may also be disposed on the outside of the housing of the projection device 10. Furthermore, this embodiment shows an example with multiple blue laser diodes 71, but a single blue laser diode 71 may also be used as the excitation light source. Additionally, the excitation light source can be any light source emitting light in the first wavelength band, and is not limited to a blue laser diode. In one embodiment, a blue LED (Light Emitting Diode) may also be used as the excitation light source.

[0052] Here, the configuration of the rotating wheel device 100 will be described. The rotating wheel device 100 is positioned on the exit side of the collimating lens 73 in the optical path of the excitation light emitted from the excitation light irradiation device 70. The rotating wheel device 100 includes a rotating wheel 101 and a motor 110. (As...) Figure 3A , Figure 3BAs shown, the rotating wheel 101 is formed in the shape of a circular plate, and its central portion is supported by the motor shaft 110a of the motor 110. By driving the motor 110, the rotating wheel 101 is driven to rotate around the motor shaft 110a. The rotating wheel 101 is arranged at an angle inclined relative to the surface of the fixed phosphor 200 containing the fluorescent light-emitting region 202, as described later, such that light emitted from the excitation light irradiation device 70 is incident obliquely relative to the plate surface (surface) of the rotating wheel 101. Furthermore, in the light source device 60, the excitation light irradiation device 70 and the fixed phosphor 200 (described later) are arranged on the surface side of the rotating wheel 101 (the side opposite to the side where the motor 110 is arranged). In other words, the excitation light irradiation device 70 and the fixed phosphor 200 are arranged on the same side relative to the plate surface of the rotating wheel 101, and the excitation light irradiation device 70 and the fixed phosphor 200 (fluorescent light-emitting device) are arranged to face the plate surface of the rotating wheel 101.

[0053] The rotating wheel 101 is a color wheel formed of a transparent material such as translucent glass or resin, and has a filter region 104 and a transmission bending region 106. The filter region 104, on the side of the rotating wheel 101 facing the excitation light irradiation device 70, includes a first filter region 104a and a second filter region 104b. The transmission bending region 106 is a region on the side of the rotating wheel 101 facing the excitation light irradiation device 70 (surface side), which is different from the filter region 104. The first filter region 104a, the second filter region 104b, and the transmission bending region 106a are arranged side-by-side in the circumferential direction of the rotating wheel 101. Figure 3A In the examples shown, they are configured with an angle range of approximately 120 degrees. Furthermore, the proportions of each region, including the first filter region 104a, the second filter region 104b, and the transmission bending region 106a, are not limited to their respective angle ranges of approximately 120 degrees and can be appropriately varied.

[0054] The first filter region 104a and the second filter region 104b in the filter region 104 are processed with dichroic mirrors to allow light of a portion of the wavelength band of fluorescence emitted from the fluorescent emission region 202 (described later) to pass through, while reflecting light of a predetermined wavelength band including the excitation light and another portion of the wavelength band of the aforementioned fluorescence. Specifically, the first filter region 104a allows green wavelength light (fourth wavelength light) to pass through, while reflecting blue wavelength light (first wavelength light) and red wavelength light (third wavelength light), which are set as the excitation light wavelength band. The second filter region 104b allows red wavelength light to pass through, while reflecting blue and green wavelength light.

[0055] Figure 3BThis is a cross-sectional schematic diagram of the rotating wheel 101. The rotating wheel 101 includes an excitation light reflecting region 105 in the area opposite to the first filter region 104a and the second filter region 104b (the side opposite to the excitation light irradiation device 70). The excitation light reflecting region 105 allows light of wavelengths other than the blue band, which is the excitation light band, to pass through, and reflects blue band light.

[0056] The transmission bending region 106 bends and transmits blue-band light, which is set to the wavelength of the excitation light. The blue-band light incident on the transmission bending region 106 is refracted in a manner that guides it toward the optical tunnel 175 described later. Specifically, the blue-band light incident on the transmission bending region 106 is bent at an angle whose optical axis overlaps with the light-guiding direction of the light-guiding optical system 170 described later. In this embodiment, as... Figure 4A As shown, a transmission diffraction grating 106a (diffraction grating) for diffracting blue wavelength light is formed in the transmission bending region 106. The transmission diffraction grating 106a constituting the transmission bending region 106 can be easily formed by providing grooves on the plate surface of the rotating wheel 101. By forming the transmission diffraction grating 106a, blue wavelength light incident on the transmission bending region 106 is diffracted as follows: Figure 4A The light path indicated by the arrow is guided. The transmission bending region 106 can also have diffusing properties to diffuse blue wavelength light, if needed.

[0057] Furthermore, in this embodiment, an example is shown where a transmission diffraction grating 106a is formed in the transmission bending region 106, but it is also possible to have a transmission diffraction grating 106a formed in the transmission bending region 106. Figure 4B As shown, a plurality of tiny transmission and refraction members 106b2 (refractive members) with inclined surfaces that refract blue wavelength light are formed in the transmission bending region 106 and arranged in a concentric circle. Alternatively, as shown... Figure 4C As shown, a transmission refraction member 106c with an inclined surface that refracts blue wavelength light is formed in the transmission bending region 106. In this case, blue wavelength light incident on the transmission bending region 106 is refracted as follows: Figure 4B , Figure 4C The light path indicated by the arrow is guided. The transmission bending region 106, including the transmission and refraction members 106b and 106c, can be easily formed by providing the transmission and refraction members 106b and 106c on the plate surface of the rotating wheel 101.

[0058] The rotating wheel 101 includes a transmission diffusion region 107 on the side opposite to the transmission bending region 106 (the side opposite to the excitation light irradiation device 70). The transmission diffusion region 107 allows blue wavelength light that has passed through the transmission bending region 106 to be transmitted through and diffused. In one embodiment, the rotating wheel 101 may also not have a transmission diffusion region 107. For example, if the image quality projected onto the projected object is good even if the blue wavelength light is not diffused by the rotating wheel 101, then the rotating wheel 101 may not have a transmission diffusion region 107.

[0059] The rotating wheel device 100 is configured such that the optical axis of the blue light transmitted through the transmission bending region 106 overlaps with the optical axis of the fluorescence transmitted through the first filter region 104a or the second filter region 104b. That is, the rotating wheel device 100 has the function of combining the blue light transmitted through the transmission bending region 106 with the green and red light transmitted through the filter region 104 to form the same optical axis. Specifically, the excitation light irradiation device 70, the rotating wheel device 100, and the fixed phosphor 200 (fluorescent emission device) are configured such that the optical axis of the blue light transmitted through the transmission bending region 106 overlaps with the optical axis of the fluorescence transmitted through the filter region 104.

[0060] Return to Figure 2 The light-guiding optical system 140 includes a first condenser lens 141 (light-guiding member) and a second condenser lens 142 (light-guiding member). The diameter of the first condenser lens 141 is smaller than the diameter of the second condenser lens 142, and the first condenser lens 141 is disposed between the second condenser lens 142 and the fixed phosphor 200. The first condenser lens 141 and the second condenser lens 142 refract the beam of blue band light reflected by the filter area 104 of the rotating wheel device 100 toward the fixed phosphor 200 and focus the beam of light emitted from the fixed phosphor 200 toward the rotating wheel device 100. Specifically, the beam of light emitted from the fixed phosphor 200 toward the rotating wheel device 100 is focused into either the first filter area 104a or the second filter area 104b incident on the rotating wheel 101.

[0061] The fixed phosphor 200 includes a substrate 201 and a fluorescent emitting region 202. The substrate 201 can be formed of a metallic material such as copper or aluminum. A flat reflective portion, which has been mirror-finished by silver evaporation or the like, is formed on the surface of the substrate 201 on the side of the rotating wheel device 100. The fluorescent emitting region 202 is disposed on the reflective portion of the surface of the substrate 201. A first heat sink 150 is provided on the right side panel 14 side of the fixed phosphor 200 to cool the fixed phosphor 200.

[0062] The fluorescent luminescent region 202 includes a phosphor layer in which phosphor particles are dispersed. The phosphor particles are excited by blue-band light (excitation light) irradiating the fluorescent luminescent region 202, emitting yellow-band light (second-band light) fluorescence. A portion of the excitation light irradiating the fluorescent luminescent region 202 excites the phosphor particles, thereby emitting fluorescence from the fluorescent luminescent region 202; another portion is reflected by the reflective portion of the mirror-finished substrate 201, thus exciting the phosphor particles. However, a portion of the excitation light reflected by the reflective portion of the substrate 201 does not excite the phosphor particles and is emitted directly from the fluorescent luminescent region 202. Furthermore, when the phosphor particles are excited, they emit fluorescence omnidirectionally, with a portion emitting directly from the phosphor region 202 and another portion reflected by the substrate 201 and emitted from the phosphor region 202.

[0063] The yellow-band fluorescence emitted from the phosphor region 202 and incident on the filter region 104 of the rotating wheel device 100 is split by the filter region 104 into light of a predetermined wavelength different from the excitation light. Specifically, the yellow-band fluorescence includes red-band light and green-band light. The red-band light is reflected and removed by the first filter region 104a, the green-band light is split, the green-band light is reflected and removed by the second filter region 104b, and the red-band light is split and transmitted through the rotating wheel 101.

[0064] Furthermore, in this embodiment, the light source device 60 is configured to include a red-green light source device 80. However, a separate red light source device emitting red light can also be provided, such that the fluorescent emitting region 202 of the fixed phosphor 200 includes a phosphor layer emitting green fluorescence. In this case, instead of the filter region 104, the rotating wheel 101 of the rotating wheel device 100 has a filter region that reflects blue light and transmits green light, and a transmission bending region 106. A dichroic mirror that transmits blue and green light and reflects red light is disposed between the light guiding optical system 140 and the light tunnel 175. The red light source device, equipped with a red light source including a red light-emitting diode or other semiconductor light-emitting element, is configured to emit the emitted red light towards the dichroic mirror in the direction from the back panel 13 to the front panel 12. The red light reflected by the dichroic mirror enters the light tunnel 175. Green fluorescence from solid phosphor 200 is transmitted through the filter region and the dichroic mirror and enters the optical tunnel 175. Blue light, which is bent and transmitted by the transmission bending region 106, is transmitted through the dichroic mirror and enters the optical tunnel 175.

[0065] The light source optical system 170 includes a light tunnel 175 as a light guide component, a third condenser lens 178, a fourth condenser lens 179, an illumination mirror 185, and a converging lens 195. Furthermore, the converging lens 195 directs image light emitted from the display element 50 disposed on the back panel 13 side of the converging lens 195 toward the projection optical system 220, and is therefore also part of the projection optical system 220.

[0066] The light tunnel 175, the third condenser lens 178, the fourth condenser lens 179, and the illumination mirror 185 are arranged sequentially on the optical axis of the left side panel 15 of the rotating wheel device 100. The light beam emitted from the exit of the light tunnel 175 is focused by the third condenser lens 178 and the fourth condenser lens 179, and then illuminated by the illumination mirror 185 and the converging lens 195 at a predetermined angle onto the display element 50.

[0067] Furthermore, in this embodiment, an example is shown where a light tunnel 175 is configured in a portion of the light source optical system 170; however, a light guide rod can also be configured instead of the light tunnel 175. By using a light guide rod instead of the light tunnel 175, light can be effectively guided. Additionally, as a variation of this embodiment, such as... Figure 5 As shown, a microlens array 90 can be configured instead of the optical tunnel 175, and a concave lens 181 can be configured instead of the third condenser lens 178. By using the microlens array 90, space saving can be achieved compared to using the optical tunnel 175, etc.

[0068] The projection optical system 220 includes a converging lens 195, a movable lens group 235, and a fixed lens group 225. The fixed lens group 225, which is disposed on the optical axis on the side of the front panel 12 of the converging lens 195, is built into a fixed lens barrel and can be adjusted for zoom and focus by manual or automatic movement.

[0069] Next, the incident and emitted light of the rotating wheel device 100 will be explained. First, based on... Figure 6 This describes the case where blue-band light, emitted as excitation light, is emitted from the rotating wheel device 100. Here, the excitation light (in...) Figure 6 The position of the rotating wheel 101 into which the light L1 (shown by the solid line) is incident is designated as the illumination point S1 (also refer to...). Figure 3A ).exist Figure 6 In the middle, the transmission bending region 106 of the rotating wheel 101 is located at the irradiation point S1.

[0070] Excitation light emitted from the excitation light irradiation device 70 is incident obliquely relative to the surface of the rotating wheel 101. When the transmission bending region 106 is located at the irradiation point S1, the excitation light incident obliquely relative to the rotating wheel 101 is incident on the transmission bending region 106 of the rotating wheel 101. The excitation light incident on the transmission bending region 106 is transmitted through the transmission bending region 106 while being bent towards the light tunnel 175, and then transmitted through the transmission diffusion region 107 while being diffused, and is emitted towards the light tunnel 175. In this way, the excitation light set to the blue wavelength band can be used as a light source.

[0071] Next, based on Figure 7 This describes the fluorescence of green-band light emitted from the rotating wheel device 100 and the fluorescence of red-band light emitted from the rotating wheel device 100. Figure 7 In the rotating wheel 101, the first filter region 104a or the second filter region 104b in the filter region 104 is located at the irradiation point S1.

[0072] Excitation light emitted from the excitation light irradiation device 70 and incident obliquely relative to the plate (surface) of the rotating wheel 101 is incident on either the first filter region 104a or the second filter region 104b in the filter region 104 of the rotating wheel 101. The excitation light incident on the filter region 104 is reflected by the filter region 104 to the side of the guide optical system 140.

[0073] The excitation light reflected from the 140-degree side of the guide optical system (in) Figure 7 Light L2 (shown by the solid line) is incident on the second condenser lens 142 and refracted sequentially by the second condenser lens 142 and the first condenser lens 141, thus illuminating the fluorescent emitting region 202 of the fixed phosphor 200. In the light source device 60, the rotating wheel 101 is arranged at an angle inclined relative to the surface of the fixed phosphor 200 containing the fluorescent emitting region 202, so that the excitation light reflected by the filter region 104 can be focused by the first condenser lens 141 and the second condenser lens 142. When the phosphor particles in the fluorescent emitting region 202 are irradiated with excitation light, they emit fluorescence in the yellow band in all directions (in... Figure 7 The light L3 is indicated by a single-dot dash. Here, the light emitted from the fluorescent emission region 202 contains yellow-band fluorescence and excitation light that is reflected directly from the substrate 201 without irradiating the phosphor particles (hereinafter referred to as "residual excitation light"). The fluorescence emitted from the phosphor region 202 and the residual excitation light emitted towards the light source optical system 140 are focused by the first condenser lens 141 and the second condenser lens 142 and incident on the rotating wheel 101.

[0074] When the first filter region 104a is located at the illumination point S1 of the rotating wheel 101, the red fluorescence in the yellow band is removed by reflection from the first filter region 104a, while the green fluorescence is transmitted through the first filter region 104a. Additionally, a portion of the residual excitation light incident on the first filter region 104a is removed by reflection from the first filter region 104a. Furthermore, residual excitation light that is not removed by the first filter region 104a and is transmitted through is removed by reflection from the excitation light reflection region 104c. Similarly, when the second filter region 104b is located at the illumination point S1, the green fluorescence in the yellow band is removed by reflection from the second filter region 104b, while the red fluorescence is transmitted through the second filter region 104b. A portion of the residual excitation light incident on the second filter region 104b is removed by reflection from the second filter region 104b. Furthermore, residual excitation light that was not removed by the second filter region 104b and was transmitted through the excitation light reflection region 104c is removed by reflection. Thus, by passing through the excitation light reflection region 104c, red-band light and green-band light (in which residual excitation light is substantially removed) can be obtained. Figure 7 The light L4 is indicated by a single-dotted line. In one embodiment, the filter region 104 may also not have the excitation light reflection region 105. For example, the filter region 104 may not have the excitation light reflection region 105 if the residual excitation light is removed to an acceptable level by the first filter region 104a and the second filter region 104b.

[0075] The red and green wavelengths of light from the transmission filter region 104 are emitted toward the optical tunnel 175. At this time, the optical paths of the red and green wavelengths of light from the rotating wheel device 100 to the optical tunnel 175 are the same as the optical path of the excitation light from the rotating wheel device 100 to the optical tunnel 175. That is, the rotating wheel device 100 is configured such that the optical axis of the excitation light transmitted through the transmission bending region 106 overlaps with the optical axes of the red and green wavelengths of light from the transmission filter region 104 at the same position and angle.

[0076] As shown above, in the light source device 60, the optical path of the blue band light used as excitation light, the optical path of the red band light (different from the excitation light), and the optical path of the green band light (different from the excitation light) are the same optical path. Therefore, compared to existing light source devices where the optical paths of the excitation light and the different band lights are different, the number of components can be reduced, enabling miniaturization and increased efficiency of the device. Furthermore, in the light source device 60, color unevenness caused by errors resulting from the different optical paths of the excitation light and the different band lights can be reduced. Additionally, the rotating wheel 101 has a transmission bending region 106 through which the excitation light is bent and transmitted, thus eliminating the need for components for bending the excitation light and enabling miniaturization of the device.

[0077] Furthermore, in the light source device 60, when blue-band light, which serves as excitation light, is emitted towards the light source optical system 170, the blue-band light is bent by the transmission bending region 106a of the rotating wheel device 100, allowing the blue-band light to be guided towards the light source optical system 170 without passing through the fixed phosphor 200. Therefore, the optical path of the blue-band light between the rotating wheel device 100 and the fixed phosphor 200 does not overlap with the optical path of the fluorescence emitted from the fixed phosphor 200. This eliminates the need for a separate configuration that uses a color wheel or similar device to disperse the blue-band light, thus enabling miniaturization of the device.

[0078] Furthermore, in the light source device 60, the excitation light irradiation device 70 and the fixed phosphor 200 are disposed on the surface side of the rotating wheel 101, that is, on the side opposite to the side where the motor 110 is disposed. As a result, the excitation light irradiation device 70 and the fixed phosphor 200 are less affected by the heat generated from the motor 110, and the excitation light irradiation device 70 and the fixed phosphor 200 can be dissipated efficiently. Therefore, the cooling fan provided in the light source device 60 can be miniaturized, and the device can be miniaturized.

[0079] Furthermore, the projection device 10 includes: a display element 50 that generates image light by being illuminated by light source light from a light source device 60; a projection optical system 220 that projects the image light emitted from the display element 50 onto a projection object such as a screen; and a control unit that controls the light source device 60 and the display element 50. Thus, a projection device 10 is provided that enables miniaturization and high efficiency of the device, and reduces the occurrence of color unevenness.

[0080] (Second Implementation)

[0081] Next, refer to Figure 8 The second embodiment of this disclosure will be described with reference to Figure 9. Furthermore, in the description of the second embodiment, descriptions of configurations identical to those in the first embodiment will be omitted or simplified. In the light source device of the second embodiment, the rotating wheel device 300 is configured at an angle parallel to the surface of the substrate 201 of the fixed phosphor 200 facing the rotating wheel device 300 (the surface including the fluorescent light-emitting region 202).

[0082] Furthermore, the filter region 304 in the rotating wheel 301 includes a first filter region and a second filter region on the side of the rotating wheel 301 opposite to the excitation light irradiation device 70 side. The regions of the first filter region and the second filter region on the side opposite to the excitation light irradiation device 70 side, which are opposite to the transmission bending region 106 (transmission diffusion region 107), are arranged side by side in the circumferential direction.

[0083] On the side of the rotating wheel 301, between the two plates of the rotating wheel 301, on the plate facing the excitation light irradiation device 70, a reflective bending region 305 is included in the area opposite to the first and second filter regions. The reflective bending region 305 reflects blue-band light, which is the excitation light, incident obliquely relative to the plate surface of the rotating wheel 301, toward the normal direction of the plate surface of the rotating wheel 301. Furthermore, the reflective bending region 305 is coated with a color-separation coating or the like to reflect blue-band light while allowing light of other wavelengths to pass through. In this embodiment, as... Figure 9A As shown, a reflection diffraction grating 305a is formed in the reflection bending region 305 to reflect and diffract blue wavelength light in the direction normal to the plate surface of the rotating wheel 301. By forming the reflection diffraction grating 305a, the blue wavelength light incident on the reflection bending region 305 is diffracted as follows: Figure 9A The light path indicated by the arrow is reflected. The reflective bending region 305 can also have diffusing properties to diffuse blue wavelength light, if needed.

[0084] Furthermore, in this embodiment, an example is shown where a reflection diffraction grating 305a is formed in the reflection bending region 305, but it is also possible to... Figure 9B As shown, multiple tiny reflective and refractive members 305b (refractive members) with inclined surfaces that reflect blue wavelength light at a predetermined angle are formed in the reflective bending region 305. Alternatively, as shown... Figure 9C As shown, a reflective refraction member 305c with an inclined surface that reflects blue wavelength light at a predetermined angle is formed in the reflective bending region 305. In this case, the predetermined angle is the angle at which blue wavelength light is reflected to the side of the guide optical system 140. The blue wavelength light incident on the reflective bending region 305 is reflected as follows: Figure 9B , Figure 9C The light path indicated by the arrow is reflected.

[0085] Next, based on Figure 8 To illustrate the light incidence and emission in the second embodiment, we will describe the cases where green-band fluorescence is emitted from the rotating wheel device 300 and red-band fluorescence is emitted from the rotating wheel device 300. Excitation light emitted from the excitation light irradiation device 70 and incident obliquely relative to the plate surface of the rotating wheel 301 is incident on the reflection bending region 305 of the rotating wheel 301. The excitation light incident on the reflection bending region 305 is reflected by the reflection bending region 305 in the normal direction to the plate surface of the rotating wheel 301 and goes to the light guiding optical system 140 side.

[0086] The excitation light reflected from the 140-degree side of the guide optical system (in) Figure 8Light L5 (shown by solid lines) is sequentially incident on the second condenser lens 142 and the first condenser lens 141 in the form of its optical axis along the optical axis directions of the first condenser lens 141 and the second condenser lens 142, illuminating the fluorescent emitting region 202 of the fixed phosphor 200. At this time, the excitation light irradiates the fluorescent emitting region 202 in a manner perpendicular to the surface of the substrate 201 of the fixed phosphor 200. The yellow-band fluorescence emitted from the fluorescent emitting region 202 by irradiating the fluorescent emitting region 202 with the excitation light is visible in the light. Figure 8 The light L6 (shown by a single-dot dash) and the residual excitation light are focused by the first condenser lens 141 and the second condenser lens 142 and incident on the reflective bending region 305 of the rotating wheel 301. In this embodiment, even when the rotating wheel 301 is arranged at an angle parallel to the plane containing the fluorescent light-emitting region 202 of the fluorescent light-emitting device 200, the excitation light reflected by the reflective bending region 305 of the rotating wheel 301 can still illuminate the fluorescent light-emitting region 202. Therefore, the design of the light source device 60 can be made easier compared to the case where the rotating wheel 301 is tilted relative to the fluorescent light-emitting region 202.

[0087] Fluorescence incident on the reflective bending region 305 of the rotating wheel 301 is transmitted through the reflective bending region 305 and incident on the first or second filter region in the filter region 304, thereby being split into red-band light or green-band light, and emitted towards the optical tunnel 175. At this time, the optical paths of the red-band light and green-band light from the rotating wheel device 300 to the optical tunnel 175 are the same as the optical paths of the excitation light from the rotating wheel device 300 to the optical tunnel 175. That is, the rotating wheel device 300 is configured with the optical axis of the excitation light transmitted through the transmission bending region 106 overlapping with the optical axes of the red-band light and green-band light transmitted through the filter region 304 at the same position and angle. Specifically, the excitation light irradiation device 70, the rotating wheel device 300, and the fixed phosphor 200 (fluorescence emitting device) are configured with the optical axis of the excitation light transmitted through the transmission bending region 106 overlapping with the optical axes of the red-band light and green-band light transmitted through the filter region 304 at the same position and angle.

[0088] Thus, in the light source device of the second embodiment, the optical path of the blue band light serving as the excitation light, the optical path of the red band light (different from the excitation light), and the optical path of the green band light are all the same optical path. This reduces the number of components compared to conventional light source devices where the optical path of the excitation light and the optical path of the different band light are different. Therefore, miniaturization and increased efficiency of the device can be achieved, and the occurrence of color unevenness can be reduced.

[0089] (Third Implementation)

[0090] Next, refer to Figure 10 and Figure 11 The third embodiment of this disclosure will now be described. Furthermore, in the description of the third embodiment, descriptions of configurations identical to those in the first embodiment will be omitted or simplified. The light source device of the third embodiment includes a fluorescent wheel device 400 as a fluorescent light-emitting device. The fluorescent wheel device 400 has a fluorescent wheel 401 formed in the shape of a circular plate and a fluorescent light-emitting region 402 formed on the fluorescent wheel 401. The central portion of the fluorescent wheel 401 is supported by a motor shaft of a motor, and the fluorescent wheel 401 is driven to rotate around the motor shaft by driving the motor. A flat reflective portion, which has been mirror-finished by silver evaporation or the like, is formed on the surface of the fluorescent wheel 401 on the side of the light-guiding optical system 140. The fluorescent light-emitting region 402 is arranged in a ring shape on the reflective portion of the surface of the fluorescent wheel 401.

[0091] In addition, such as Figure 11 As shown, in the rotating wheel device 500, the rotating wheel 501 on the side of the excitation light irradiation device 70 between the two plates of the rotating wheel 501 includes a filter region 504 and a transmission bending region 506. Furthermore, the filter region 504 includes a first filter region 504a, a second filter region 504b, and a third filter region 504c. The first filter region 504a, the second filter region 504b, the third filter region 504c, and the transmission bending region 506 are arranged side-by-side in the circumferential direction of the rotating wheel 501. Figure 11 The examples shown are configured with an angle range of approximately 90 degrees.

[0092] The first filter region 504a, the second filter region 504b, and the third filter region 504c are all processed with dichroic mirrors. The first filter region 504a allows green light to pass through and reflects blue and red light. The second filter region 504b allows red light to pass through and reflects blue and green light. The third filter region 504c allows yellow light to pass through and reflects blue, green, and red light.

[0093] like Figure 10 As shown, the filtering region 504 of the rotating wheel 501 includes an excitation light reflection region 505 on the side opposite to the first filtering region 504a, the second filtering region 504b, and the third filtering region 504c. Additionally, the rotating wheel 501 includes a transmission diffusion region 507 on the side opposite to the transmission bending region 506. In the light source device of this embodiment, by designing the third filtering region 504c of the fluorescence transmission filtering region 504 emitted from the fluorescence emitting region 402 according to the hue, yellow-band light can be guided to the light source optical system side. In one embodiment, the rotating wheel 501 may also lack the transmission diffusion region 507 and the excitation light reflection region 505.

[0094] like Figure 10 As shown, in the light source device of the third embodiment, the optical path of the blue band light, which serves as the excitation light, and the optical paths of the red band light, green band light, and yellow band light, which are different from the excitation light, are also the same optical path (in...). Figure 10 In the diagram, solid lines represent the excitation light (blue band light) reflected from the guide optical system 140 and the excitation light transmitted through the rotating wheel device 500. Dashed lines represent the yellow band fluorescence emitted from the fluorescence emission region 402 of the fluorescence wheel device 400, and the red, green, and yellow band light transmitted through the rotating wheel device 500. Therefore, the same effects as the light source device 60 of the first embodiment and the light source device of the second embodiment (miniaturization, increased efficiency, and reduced color unevenness) can be obtained.

[0095] Furthermore, by using the fluorescent wheel device 400 as a fluorescent light-emitting device, the color of the fluorescence emitted from the fluorescent light-emitting region 402 can be changed to a color other than yellow wavelength light as needed. Moreover, by using the fluorescent wheel device 400, the heat concentration caused by the irradiated excitation light on a portion of the fluorescent light-emitting region 402 can be suppressed.

[0096] In one embodiment, in the first and second embodiments described above, a fluorescent wheel device 400 may be used instead of a fixed phosphor 200 as the fluorescent light-emitting device. Furthermore, in one embodiment, in the first and second embodiments described above, a reference device may also be used. Figure 10 and Figure 11 The configuration of the rotating wheel 501 is described. Specifically, the filter region 104 (or filter region 304) may also have a third filter region on the same side as the first filter region 104a (or the first filter region of filter region 304) and the second filter region 104b (or the second filter region of filter region 304), which is the same as the third filter region 504c that allows yellow light to pass through while reflecting blue, green, and red light. In this case, the first filter region 104a (or the first filter region of filter region 304), the second filter region 104b (or the second filter region of filter region 304), the third filter region, and the transmission bending region 106 (or the transmission diffusion region 107) are arranged side by side in the circumferential direction of the rotating wheels 101 and 301.

[0097] (Fourth implementation)

[0098] Next, refer to Figures 12-16 The fourth embodiment of this disclosure will now be described. Furthermore, in the description of the fourth embodiment, descriptions of configurations identical to those in the first embodiment will be omitted or simplified. Figure 12As shown, the projection device 10 of the fourth embodiment includes: a light source device 560 disposed in the generally central part of the projection device 10; a light source optical system 170 disposed to the left of the light source device 560; and a projection optical system 220 disposed between the light source optical system 170 and the control circuit board 242.

[0099] The light source device 560 includes: an excitation light irradiation device 70, which is both a light source for blue wavelength light (first wavelength light) and an excitation light source; a red-green light source device 80, which is a light source for red wavelength light (third wavelength light) and green wavelength light (fourth wavelength light); a rotating wheel device 600; and a fixed phosphor 200 (fluorescent light-emitting device). The excitation light irradiation device 70 is configured to face the plate surface of the rotating wheel 601 of the rotating wheel device 600, and the fixed phosphor 200 (fluorescent light-emitting device) is configured to face the plate surface of the rotating wheel 601 opposite to the excitation light irradiation device 70. The configuration and function of the excitation light irradiation device 70 are the same as in the first embodiment. The red-green light source device 80 includes the excitation light irradiation device 70, the rotating wheel device 600, and the fixed phosphor 200. Additionally, the light source device 560 is equipped with: a light guiding optical system 140, which guides the excitation light transmitted through the rotating wheel device 600 to the fixed phosphor 200 side and guides the fluorescence emitted from the fluorescence emission region 202 of the fixed phosphor 200 to the rotating wheel device 600 side; and a light source optical system 170, which guides the light transmitted through the rotating wheel device 600.

[0100] Next, the configuration of the rotating wheel 601 in the rotating wheel device 600 will be described. The rotating wheel 601 is a color wheel formed of a transparent material such as translucent glass or resin, and has a light-filtering region 604 and a light-transmitting bending region 606. The configuration for driving the rotating wheel 601 to rotate is the same as in the first embodiment (see [reference]). Figure 13B The filtering region 604, located on the side (surface side) of the rotating wheel 601 opposite to the excitation light irradiation device 70, includes a first filtering region 604a and a second filtering region 604b. The transmission bending region 606 is disposed on the side (surface side) of the rotating wheel 601 opposite to the excitation light irradiation device 70, and is different from the filtering region 604. The first filtering region 604a, the second filtering region 604b, and the transmission bending region 606 are arranged side-by-side in the circumferential direction of the rotating wheel 601. Figure 13A In the examples shown, they are configured with an angle range of approximately 120 degrees. Furthermore, the proportions of each region, including the first filter region 604a, the second filter region 604b, and the transmission bending region 606, are not limited to their respective angle ranges of approximately 120 degrees and can be appropriately varied.

[0101] The first filter region 604a and the second filter region 604b in the filter region 604 are processed with dichroic mirrors to reflect a portion of the wavelength band of the fluorescence emitted from the fluorescent emission region 202 (described later), while allowing light including a predetermined wavelength band of excitation light and another portion of the wavelength band of the aforementioned fluorescence to pass through. Specifically, the first filter region 604a reflects green wavelength light (fourth wavelength light) and allows blue wavelength light (first wavelength light) and red wavelength light (third wavelength light), which are set as the wavelength band of the excitation light, to pass through. The second filter region 604b reflects red wavelength light and allows blue wavelength light and green wavelength light to pass through.

[0102] The transmission bending region 606 bends and transmits blue-band light, which is set to the wavelength of the excitation light. The blue-band light incident on the transmission bending region 606 is refracted in a manner that guides it toward the light tunnel 175 described later. Specifically, the blue-band light incident on the transmission bending region 606 is bent at an angle whose optical axis overlaps with the light guiding direction of the light guiding optical system 170 described later. In this embodiment, as... Figure 14A As shown, a transmission diffraction grating 606a (diffraction grating) for diffracting blue wavelength light is formed in the transmission bending region 606. The transmission diffraction grating 606a constituting the transmission bending region 606 can be easily formed by providing a groove on the plate surface of the rotating wheel 601. By forming the transmission diffraction grating 606a, blue wavelength light incident on the transmission bending region 606 is diffracted as follows: Figure 14A The light path indicated by the arrow is guided. The transmission bending region 606 can also have diffusing properties to diffuse blue wavelength light, as needed.

[0103] Furthermore, in this embodiment, an example is shown where the transmission bending region 606 is disposed on the surface side of the rotating wheel 601, and a transmission diffraction grating 606a is formed in the transmission bending region 606. However, it is also possible to... Figure 14B As shown, a transmission bending region 606 is provided in the inner region of the rotating wheel 601 that does not correspond to the filter region 604, and a transmission diffusion region 607 is provided on the surface of the rotating wheel 601 corresponding to the transmission bending region 606, allowing blue wavelength light that has passed through the transmission bending region 606 to pass through and diffuse. In this case, the blue wavelength light incident on the transmission bending region 606 diffuses as follows: Figure 14B The light path indicated by the arrow is guided. In one embodiment, it can also be applied to the transmission bending region 606. Figure 4B , Figure 4C The configuration shown is as follows. Specifically, in the transmission bending region 606, multiple tiny transmission refraction members with inclined surfaces that refract blue wavelength light and arranged concentrically can be formed, or a single transmission refraction member with an inclined surface that refracts blue wavelength light can be formed. Furthermore, in one embodiment, it is also possible to... Figure 14B The transmission diffusion region 607 is not provided in the configuration. For example, if the image quality projected onto the projected object is good even if the blue band light is not diffused by the rotating wheel 601, then the transmission diffusion region 607 may not be provided.

[0104] The rotating wheel device 600 is configured to overlap the optical axis of the blue wavelength light that is bent and transmitted through the transmission bending region 606 with the optical axis of the fluorescence reflected by the filter region 604 (first filter region 604a or second filter region 604b). That is, the rotating wheel device 600 has the function of combining the blue wavelength light transmitted through the transmission bending region 606 with the green and red wavelength light reflected by the filter region 604 into the same optical axis. Specifically, the excitation light irradiation device 70, the rotating wheel device 600, and the fixed phosphor 200 (fluorescent emission device) are configured to overlap the optical axis of the blue wavelength light transmitted through the transmission bending region 606 with the optical axis of the fluorescence reflected by the filter region 604.

[0105] The yellow-band fluorescence emitted from the phosphor region 202 and incident on the filter region 604 of the rotating wheel device 600 is split by the filter region 604 into light of a predetermined wavelength different from the excitation light. Specifically, the yellow-band fluorescence includes red-band light and green-band light. The red-band light is transmitted through the first filter region 604a and removed, the green-band light is split and reflected by the rotating wheel 601, the green-band light is transmitted through the second filter region 604b and removed, and the red-band light is split and reflected by the rotating wheel 601.

[0106] Next, the incident and emitted light of the rotating wheel device 600 will be explained. First, based on... Figure 15 Let's explain the case of blue-band light emitted as excitation light from the rotating wheel device 600. Here, the excitation light (in...) Figure 15 The position of the rotating wheel 601 into which the light L7 (shown by the solid line) is incident is designated as the illumination point S2 (also refer to...). Figure 13A ).exist Figure 15 In the middle, the transmission bending area 606 of the rotating wheel 601 is located at the irradiation point S2.

[0107] Excitation light emitted from the excitation light irradiation device 70 is incident obliquely relative to the inside of the rotating wheel 601. When the transmission bending region 606 is located at the irradiation point S2, the excitation light incident obliquely relative to the rotating wheel 601 is incident on the transmission bending region 606 of the rotating wheel 601. The excitation light incident on the transmission bending region 606 is transmitted through the transmission bending region 606 while being bent towards the light tunnel 175, and is emitted toward the light tunnel 175. In this way, the excitation light set to the blue wavelength can be used as a light source. Furthermore, when a transmission diffusion region 607 is provided on the surface of the rotating wheel 601 corresponding to the transmission bending region 606, the excitation light incident obliquely relative to the rotating wheel 601 is diffused by the transmission diffusion region 607 after being bent by the transmission bending region 606, and is emitted toward the light tunnel 175.

[0108] Next, based on Figure 16 This describes the fluorescence of green-band light emitted from the rotating wheel device 600 and the fluorescence of red-band light emitted from the rotating wheel device 600. Figure 16 In the rotating wheel 601, the first filter region 604a or the second filter region 604b in the filter region 604 is located at the irradiation point S2.

[0109] Excitation light emitted from the excitation light irradiation device 70 and incident obliquely relative to the plate surface (inside) of the rotating wheel 601 is incident on either the first filter region 604a or the second filter region 604b in the filter region 604 of the rotating wheel 601. The excitation light incident on the filter region 604 is transmitted through the filter region 604 without bending and exits to the side of the guide optical system 140.

[0110] The excitation light emitted from the 140-degree side of the guide optical system (in) Figure 16 Light L8 (shown by solid lines) enters the second condenser lens 142 from its front, passes through the second condenser lens 142 and the first condenser lens 141 in sequence, and illuminates the fluorescent emission region 202 of the fixed phosphor 200. In the light source device 560, the excitation light emitting device 70 is arranged opposite the surface of the fixed phosphor 200 containing the fluorescent emission region 202, separated by a rotating wheel 601, so that the excitation light from the transmission filter light region 604 can enter the first condenser lens 141 and the second condenser lens 142 from their front. When the phosphor particles in the fluorescent emission region 202 are illuminated by the excitation light, they emit yellow fluorescence in all directions (in... Figure 16The light L9 is indicated by a single-dot dash. Here, the light emitted from the fluorescent emission region 202 contains yellow-band fluorescence and residual excitation light that is directly reflected by the substrate 201 without irradiating the phosphor particles. The fluorescence and residual excitation light emitted from the phosphor region 202 that are emitted toward the light source optical system 140 are focused by the first condenser lens 141 and the second condenser lens 142 and incident on the surface of the rotating wheel 601 relative to it.

[0111] When the first filter region 604a is located at the illumination point S2 of the rotating wheel 601, the red fluorescence in the yellow fluorescence is removed by transmission through the first filter region 604a, and the green fluorescence is reflected by the first filter region 604a. Additionally, residual excitation light incident on the first filter region 604a is removed by transmission through the first filter region 604a. Similarly, when the second filter region 604b is located at the illumination point S2, the green fluorescence in the yellow fluorescence is removed by transmission through the second filter region 604b, and the red fluorescence is reflected by the second filter region 604b. Residual excitation light incident on the second filter region 604b is removed by transmission through the second filter region 604b. Thus, it is possible to obtain red and green light (in which residual excitation light is substantially removed) with the red and green fluorescence essentially removed. Figure 16 The light L10 is indicated by a single-dot dash.

[0112] The red and green wavelengths of light reflected by the filter region 604 are emitted toward the optical tunnel 175. In the light source device 560, the rotating wheel 601 is arranged at an angle inclined relative to the surface of the fixed phosphor 200 containing the fluorescent light-emitting region 202, thereby guiding the red and green wavelengths of light reflected by the filter region 604 toward the optical tunnel 175. At this time, the optical paths of the red and green wavelengths of light traveling from the rotating wheel device 600 to the optical tunnel 175 are the same as the optical paths of the excitation light traveling from the rotating wheel device 600 to the optical tunnel 175. That is, the rotating wheel device 600 is arranged at a position and angle where the optical axis of the excitation light transmitted through the transmission bending region 606 overlaps with the optical axes of the red and green wavelengths of light reflected by the filter region 604.

[0113] As shown above, in the light source device 560, the optical path of the blue band light used as excitation light, the optical path of the red band light (different from the excitation light), and the optical path of the green band light (different from the excitation light) are the same optical path. Therefore, compared with existing light source devices where the optical path of the excitation light and the optical path of the different band light are different optical paths, the number of components can be reduced, enabling miniaturization and increased efficiency of the device. Furthermore, in the light source device 560, color unevenness caused by errors resulting from the different optical paths of the excitation light and the different band light can be reduced. Additionally, the rotating wheel 601 has a transmission bending region 606 through which the excitation light is bent and transmitted, thus eliminating the need for components for bending the excitation light and enabling miniaturization of the device.

[0114] Furthermore, in the light source device 560, the excitation light irradiation device 70 is positioned on the opposite side from the side where the fixed phosphor 200 is located, across the plate surface of the rotating wheel 601. This facilitates the entry of the excitation light emitted from the excitation light irradiation device 70 into the guide optical system 140, thereby increasing the freedom of arrangement of the excitation light irradiation device 70 and enabling easy adjustment of the optical axis.

[0115] (Fifth Embodiment)

[0116] Next, refer to Figure 17 The fifth embodiment of this disclosure will now be described. Furthermore, in the description of the fifth embodiment, descriptions of configurations identical to those in the fourth embodiment will be omitted or simplified. In the light source device 660 of the fifth embodiment, the arrangement and configuration of the excitation light irradiation device 70, the fixed phosphor 200, the light guiding optical system 140, and the rotating wheel device 700 differ from those in the fourth embodiment. For example... Figure 17 As shown, in the light source device 660, the excitation light irradiation device 70 is arranged opposite to the light tunnel 175, such that the light tunnel 175 is located on the optical axis of the excitation light emitted from the excitation light irradiation device 70.

[0117] The rotating wheel 701 in the rotating wheel device 700 is arranged at an angle inclined relative to the surface of the fixed phosphor 200 containing the fluorescent light-emitting region 202, such that light emitted from the excitation light irradiation device 70 is incident obliquely relative to the plate surface (inside) of the rotating wheel 701. The rotating wheel 701 contains a filtering region 704 and a transmission bending region 706 in the same area of ​​its plate surface. That is, the plate surface of the rotating wheel 701 on the side opposite to the excitation light irradiation device 70 (the surface side) contains the filtering region 704, and the inner region corresponding to the filtering region 704 contains the transmission bending region 706. Furthermore, the filtering region 704 includes a first filtering region and a second filtering region arranged side-by-side in the circumferential direction of the rotating wheel 701. The functions of the filtering region 704, the transmission bending region 706, the first filtering region, and the second filtering region are the same as in the fourth embodiment.

[0118] Furthermore, an excitation light transmission region 707 is provided in the area of ​​the plate on the side (inner side) of the excitation light irradiation device 70 between the two plates of the rotating wheel 701, in a region different from the filter region 704 and the transmission bending region 706. The excitation light transmission region 707 allows blue wavelength light to pass through. This excitation light transmission region 707 may also have diffusivity to diffuse blue wavelength light, as needed. In one embodiment, the excitation light transmission region 707 is formed of a transparent material such as transmissive glass or resin. Moreover, in one embodiment, the excitation light transmission region 707 may also be provided on the surface side of the rotating wheel 701, or it may be provided on both sides of the rotating wheel 701.

[0119] In one embodiment, as described in the first embodiment, a transmission diffraction grating for diffracting blue-band light may be formed in the transmission bending region 706. Alternatively, a plurality of tiny transmission refraction members having inclined surfaces for refracting blue-band light and arranged concentrically may be formed in the transmission bending region 706. Alternatively, a single transmission refraction member having an inclined surface for refracting blue-band light may be formed in the transmission bending region 706.

[0120] The rotating wheel device 700 is configured to overlap the optical axis of the blue band light transmitted through the excitation light transmission region 707 with the optical axis of the fluorescence reflected by the filter region 704 (the first filter region or the second filter region). That is, the rotating wheel device 700 has the function of combining the blue band light transmitted through the excitation light transmission region 707 with the green band light and red band light reflected by the filter region 704 into the same optical axis.

[0121] Next, the incident and emitted light of the rotating wheel device 700 in the fifth embodiment will be described. First, the case where blue-band light, serving as excitation light, is emitted from the rotating wheel device 700 will be described. In this case, the excitation light transmission region 707 of the rotating wheel 701 is located at the irradiation point on the rotating wheel 701 where the excitation light is incident. The excitation light emitted from the excitation light irradiation device 70 is incident obliquely relative to the plate surface (inside) of the rotating wheel 701. When the excitation light transmission region 707 is located at the irradiation point, the excitation light incident obliquely relative to the rotating wheel 701 is incident on the excitation light transmission region 707 of the rotating wheel 701. The excitation light incident on the excitation light transmission region 707 is transmitted through the excitation light transmission region 707 without bending and is emitted toward the light tunnel 175 side. In this way, the excitation light, which is set to blue-band light, can be used as a light source.

[0122] Next, the fluorescence of green-band light emitted from the rotating wheel device 700 and the fluorescence of red-band light emitted from the rotating wheel device 700 will be described. In this case, at the irradiation point on the rotating wheel 701, the filter region 704 is located on the surface side, and the transmission bending region 706 is located on the inner side. The excitation light emitted from the excitation light irradiation device 70 and incident obliquely relative to the plate surface (inner side) of the rotating wheel 701 is incident on the transmission bending region 706 of the rotating wheel 701. The excitation light incident on the transmission bending region 706 is bent by the transmission bending region 706 on the guide optical system 140 side and then passes through the transmission bending region 706 and the filter region 704, and exits on the guide optical system 140 side.

[0123] The excitation light emitted from the 140-degree side of the guide optical system (in) Figure 17 Light L11 (shown by solid lines) enters the second condenser lens 142 from its front and passes sequentially through the second condenser lens 142 and the first condenser lens 141, illuminating the fluorescent emitting region 202 of the fixed phosphor 200. When the phosphor particles in the fluorescent emitting region 202 are irradiated with excitation light, they emit yellow fluorescence in all directions (in... Figure 17 The light L12 is indicated by a single-dot dash. The fluorescence and residual excitation light emitted from the phosphor region 202 toward the light source optical system 140 are focused by the first condenser lens 141 and the second condenser lens 142 and incident on the surface of the rotating wheel 701 relative to its surface.

[0124] When the first filter region is located at the illumination point of the rotating wheel 701, the green fluorescence is reflected by the first filter region; when the second filter region is located at the illumination point of the rotating wheel 701, the red fluorescence is reflected by the second filter region. The red and green light reflected by the filter region 704 exits towards the optical tunnel 175. At this time, the optical paths of the red and green light from the rotating wheel device 700 to the optical tunnel 175 are the same as the optical path of the excitation light from the rotating wheel device 700 to the optical tunnel 175.

[0125] As explained above, in the light source device 660 of this embodiment, the rotating wheel 701 includes: a filter region 704, which is disposed in a region on the opposite side of the surface corresponding to the transmission bending region 706, so that green-band fluorescence and red-band fluorescence are reflected and excitation light is transmitted through it; and an excitation light transmission region 707, which is disposed in a region different from the transmission bending region 706, so that excitation light is transmitted through it. Furthermore, the rotating wheel device 700 is configured such that the optical axis of the excitation light transmitted through the excitation light transmission region 707 overlaps with the optical axes of the green-band fluorescence and red-band fluorescence reflected by the filter region 704. Therefore, similar to the fourth embodiment, the number of components can be reduced compared to conventional light source devices, enabling miniaturization and increased efficiency of the device. In addition, it can reduce color unevenness caused by errors resulting from the different optical paths of the excitation light and the light of a different wavelength band.

[0126] Furthermore, in the light source device 660 of this embodiment, the excitation light emitted from the excitation light irradiation device 70 is bent by the transmission bending region 706 of the rotating wheel 701, thereby irradiating the fluorescence emitting region 202 of the fixed phosphor 200. Therefore, it is easy to irradiate the fixed phosphor 200 with excitation light.

[0127] (Sixth Embodiment)

[0128] Next, refer to Figure 18 The sixth embodiment of this disclosure will be described with reference to Figure 19. Furthermore, in the description of the sixth embodiment, descriptions of configurations identical to those in the fourth embodiment will be omitted or simplified. In the light source device 760 of the sixth embodiment, the arrangement and configuration of the excitation light irradiation device 70, the fixed phosphor 200, the light guiding optical system 140, and the rotating wheel device 800 differ from those in the fourth embodiment. In the light source device 760 of the sixth embodiment, the fixed phosphor 200 is arranged opposite the light tunnel 175, separated by the rotating wheel device 800.

[0129] The rotating wheel 801 in the rotating wheel device 800 is arranged at an angle inclined relative to the surface of the fixed phosphor 200 containing the fluorescent light-emitting region 202, such that light emitted from the excitation light irradiation device 70 is incident obliquely relative to the plate surface (surface) of the rotating wheel. Figure 19A As shown, the rotating wheel 801 includes a filter region 804 and a transmission bending region 806 in the same area of ​​its plate surface. That is, the plate surface of the rotating wheel 801 on the side of the excitation light irradiation device 70 (surface side) includes the filter region 804, and the region inside the filter region 804 includes the transmission bending region 806. Furthermore, the filter region 804 includes a first filter region and a second filter region arranged side-by-side in the circumferential direction of the rotating wheel 801. Blue wavelength light incident from the surface of the rotating wheel 801 onto the filter region 804... Figure 19A The arrow indicates the transmission filter light region 804, which transmits light through the transmission bending region 806 while being bent by the transmission bending region 806.

[0130] In this sixth embodiment, the functions of the transmission bending region 806 and the first and second filter regions in the filter region 804 differ from those in the fourth and fifth embodiments. Specifically, the transmission bending region 806 allows not only blue light to pass through, but also green and red light. Examples of the transmission bending region 806 include volumetric holographic elements and diffraction gratings with stacked structures. Furthermore, the first filter region allows green and blue light to pass through while reflecting red light. The second filter region allows red and blue light to pass through while reflecting green light.

[0131] like Figure 19B As shown, an excitation light reflecting region 805 is provided in the area on the side (surface side) of the excitation light irradiation device 70 between the two plates of the rotating wheel 801, different from the filter region 804 and the transmission bending region 806. The excitation light reflecting region 805 reflects the blue-band light used as excitation light. This excitation light reflecting region 805 may also have diffusing properties to diffuse the blue-band light as needed. Blue-band light incident from the surface of the rotating wheel 801 onto the excitation light reflecting region 805, such as… Figure 19B The arrow indicates that the light is reflected by the excitation light reflection region 805.

[0132] The rotating wheel device 800 is configured to overlap the optical axis of the blue light reflected by the excitation light reflecting region 805 with the optical axis of the fluorescence in the transmission filter region 804 (first filter region or second filter region). That is, the rotating wheel device 800 has the function of combining the blue light reflected by the excitation light reflecting region 805 with the green and red light from the transmission filter region 804 onto the same optical axis. Specifically, the excitation light irradiation device 70, the rotating wheel device 800, and the fixed phosphor 200 (fluorescence emitting device) are configured to overlap the optical axis of the blue light reflected by the excitation light reflecting region 805 with the optical axis of the fluorescence in the transmission filter region 804.

[0133] Next, based on Figure 18 The incident and emitted light of the rotating wheel device 800 in the sixth embodiment will be explained. First, the case where blue-band light, serving as excitation light, is emitted from the rotating wheel device 800 will be explained. In this case, the excitation light reflecting region 805 of the rotating wheel 801 is located at the irradiation point on the rotating wheel 801 where the excitation light is incident. The excitation light emitted from the collimating lens 73 of the excitation light irradiation device 70 is incident obliquely relative to the surface of the rotating wheel 801. When the excitation light reflecting region 805 is located at the irradiation point, the excitation light incident obliquely relative to the rotating wheel 801 is incident on the excitation light reflecting region 805 of the rotating wheel 801. The excitation light incident on the excitation light reflecting region 805 is reflected by the excitation light reflecting region 805 toward the light tunnel 175 side. In this way, the excitation light, which is set to blue-band light, can be used as a light source.

[0134] Next, the fluorescence of green-band light emitted from the rotating wheel device 800 and the fluorescence of red-band light emitted from the rotating wheel device 800 will be described. In this case, at the irradiation point on the rotating wheel 801, the filter region 804 is located on the surface side, and the transmission bending region 806 is located on the inner side. The excitation light emitted from the excitation light irradiation device 70 and incident obliquely relative to the plate surface (surface) of the rotating wheel 801 is incident on the filter region 804 of the rotating wheel 801. The excitation light incident on the filter region 804 is transmitted through the filter region 804 and is also transmitted through the transmission bending region 806 while being bent by the transmission bending region 806 to the side of the guide optical system 140, and then exits to the side of the guide optical system 140.

[0135] The excitation light emitted from the 140-degree side of the guide optical system (in) Figure 18 Light L13 (shown by solid lines) enters the second condenser lens 142 from its front and passes sequentially through the second condenser lens 142 and the first condenser lens 141, illuminating the fluorescent emitting region 202 of the fixed phosphor 200. When the phosphor particles in the fluorescent emitting region 202 are irradiated with excitation light, they emit yellow fluorescence in all directions (in... Figure 18The light L14 is indicated by a single-dot dash. The fluorescence and residual excitation light emitted from the phosphor region 202 toward the light source optical system 140 are focused by the first condenser lens 141 and the second condenser lens 142 and incident from therewith relative to the rotating wheel 801.

[0136] Fluorescence and residual excitation light incident from the rotating wheel 801 are transmitted through the transmission bending region 806 and incident on either the first or second filter region. When the first filter region is located at the illumination point of the rotating wheel 801, green-band fluorescence is transmitted through the first filter region; when the second filter region is located at the illumination point of the rotating wheel 801, red-band fluorescence is transmitted through the second filter region. The red-band and green-band light from the transmission filter region 804 exit towards the optical tunnel 175. At this time, the optical paths of the red-band and green-band light from the rotating wheel device 800 to the optical tunnel 175 are the same as the optical path of the excitation light from the rotating wheel device 800 to the optical tunnel 175.

[0137] As explained above, in the light source device 760 of this embodiment, the transmission bending region 806 allows both green and red fluorescence to pass through. The rotating wheel 801 includes: a filter region 804, which is located on the opposite side of the surface corresponding to the transmission bending region 806, allowing either green or red fluorescence to pass through and excitation light to pass through; and an excitation light reflection region 805, which is located in a region different from the transmission bending region 806, reflecting the excitation light. The rotating wheel device 800 is configured such that the optical axis of the excitation light reflected by the excitation light reflection region 805 overlaps with the optical axis of the fluorescence of a predetermined wavelength from the transmission filtering region 804. Therefore, similar to the fourth embodiment, the number of components can be reduced compared to conventional light source devices, enabling miniaturization and increased efficiency of the device. Furthermore, it can reduce color unevenness caused by errors resulting from the different optical paths of the excitation light and the light of a different wavelength band. In one embodiment, the transmission bending region 806 can also be provided on the plate surface on the side of the excitation light irradiation device 70 of the rotating wheel 801, and the filter region 804 can also be provided on the plate surface on the side of the fixed phosphor 200. Furthermore, in one embodiment, in embodiments 4 to 6, a light guide rod can be used instead of the light tunnel 175, and a reference can also be configured. Figure 5 The microlens array 90 is used to replace the optical tunnel 175, and a concave lens 181 is used to replace the third condenser lens 178.

[0138] In one embodiment, in the fourth to sixth embodiments described above, the fluorescent wheel device 400 of the third embodiment can be used instead of the fixed phosphor 200 as the fluorescent light-emitting device. Furthermore, in one embodiment, in the fourth to sixth embodiments described above, the same as described above can also be applied. Figure 10 and Figure 11 The configuration corresponding to the rotating wheel 501 described herein. Specifically, in the fourth and fifth embodiments, the filter regions 604 and 704 may also have a third filter region on the surface of the same side as the first filter region 604a and the second filter region 604b, which reflects yellow light and transmits blue, green, and red light. In the sixth embodiment, the filter region 804 may also have a third filter region on the surface of the same side as the first and second filter regions, which is the same as the third filter region 504c that transmits yellow light and reflects blue, green, and red light.

[0139] The embodiments described above are given as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, and are included in the scope of the invention as described in the claims and its equivalents.

Claims

1. A light source device, characterized in that, have: An excitation light irradiation device that emits excitation light; A rotating wheel device comprising: a filtering region that reflects light of a predetermined wavelength different from that of the excitation light and allows the excitation light to pass through; and a transmission bending region that bends and transmits the excitation light; and... A fluorescent light-emitting device, which, when illuminated by excitation light transmitted through the filter region, emits fluorescence containing light of the specified wavelength towards the filter region. The filtering region is located in a region of the rotating wheel that is different from the transmission bending region, so that the fluorescence of the specified wavelength band is reflected. The rotating wheel device is configured such that the optical axis of the excitation light transmitted through the transmission bending region overlaps with the optical axis of the fluorescence of the specified wavelength band reflected by the filter region.

2. A light source device, characterized in that, have: An excitation light irradiation device that emits excitation light; A rotating wheel device comprising: a filtering region that reflects light of a predetermined wavelength different from that of the excitation light and allows the excitation light to pass through; and a transmission bending region that bends and transmits the excitation light; and... A fluorescent light-emitting device, which, when illuminated by excitation light transmitted through the filter region, emits fluorescence containing light of the specified wavelength towards the filter region. The rotating wheel includes a region that is different from the transmission bending region and is an excitation light transmission region through which the excitation light is transmitted. The filtering region is located on the opposite side of the rotating wheel to the transmission bending region, causing fluorescence of the specified wavelength band to be reflected. The rotating wheel device is configured such that the optical axis of the excitation light transmitted through the excitation light transmission region overlaps with the optical axis of the fluorescence of the specified wavelength band reflected by the filter region.

3. A light source device, characterized in that, have: An excitation light irradiation device that emits excitation light; A rotating wheel device comprising: a filtering region that allows light of a predetermined wavelength band different from the excitation light to pass through and allows the excitation light to pass through; and a transmission bending region that bends the excitation light and allows it to pass through. as well as A fluorescent light-emitting device, which, when illuminated by excitation light transmitted through the filter region, emits fluorescence containing light of the specified wavelength towards the filter region. The rotating wheel includes an excitation light reflecting region that is different from the transmission bending region and reflects the excitation light. The filtering region is located on the opposite side of the rotating wheel to the transmission bending region, allowing fluorescence of the specified wavelength band to pass through. The rotating wheel device is configured such that the optical axis of the excitation light reflected by the excitation light reflection region overlaps with the optical axis of the fluorescence of the specified wavelength band transmitted through the filter region.

4. The light source device according to any one of claims 1 to 3, characterized in that, The excitation light irradiation device is positioned on the opposite side from the side where the fluorescent light-emitting device is located, across the plate surface of the rotating wheel.

5. The light source device according to any one of claims 1 to 3, characterized in that, It has a light guide component that guides the excitation light transmitted through the filter region to the fluorescent light-emitting device.

6. The light source device according to any one of claims 1 to 3, characterized in that, The rotating wheel is configured at an angle that is tilted relative to the surface of the fluorescent light-emitting device containing the fluorescent light-emitting region.

7. The light source device according to claim 1, characterized in that, It has an optical tunnel or light guide rod, which guides the excitation light transmitted through the transmission bending region and the fluorescence of the specified wavelength band reflected by the filtering region.

8. The light source device according to claim 1, characterized in that, It has a microlens array that guides the excitation light transmitted through the transmission bending region and the fluorescence of the specified wavelength reflected by the filtering region.

9. The light source device according to claim 1, characterized in that, The rotating wheel includes a transmission diffusion region on the surface corresponding to the transmission bending region, through which the excitation light that has passed through the transmission bending region diffuses and is transmitted.

10. The light source device according to any one of claims 1 to 3, characterized in that, A diffraction grating is formed in the transmission bending region to diffract the excitation light.

11. The light source device according to claim 1 or 2, characterized in that, A refractive member having an inclined surface that refracts the excitation light is formed in the transmission bending region.

12. The light source device according to claim 1 or 2, characterized in that, The filtering region includes: a first filtering region that reflects first-band light in the fluorescence of the specified wavelength band and transmits second-band light in the fluorescence of the specified wavelength band that is different from the first-band light; and The second filtering region reflects the second band of light and allows the first band of light to pass through.

13. A projection device, characterized in that, have: The light source device according to any one of claims 1 to 12; Display elements that generate image light; A projection optical system that projects the image light emitted from the display element onto a projected object; and The control unit controls the light source device and the display element.

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