Light source device and projection device

Abstract

The present application provides a light source device capable of realizing miniaturization of the device and reducing color unevenness, and a projection device provided with the light source device. The light source device is provided with: an excitation light irradiation device (70) that emits excitation light; a rotating wheel device (100) provided with a rotating wheel (101) including a light filtering region (104) that transmits light of a predetermined wavelength band different from a wavelength band of the excitation light and reflects the excitation light, and a transmission bending region (106) that transmits the excitation light after bending; and a fixed phosphor (200) that is irradiated with the excitation light after being reflected by the light filtering region (104), emits phosphor light including light of the predetermined wavelength band toward the light filtering region (104), and the rotating wheel device (100) is configured such that an optical axis of the excitation light after being transmitted through the transmission bending region (106) overlaps with an optical axis of the phosphor light of the predetermined wavelength band after being transmitted through the light filtering region (104).

Description

[0001] With respect to this application, priority is claimed based on Japanese Patent Application No. 2021-149569 filed on September 14, 2021, and the entire contents of that basic application are incorporated herein. Technical Field

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

[0003] Currently, projection devices are used to project images, video feeds, and image data stored on memory cards onto a screen. These devices converge light emitted from a light source onto a micromirror display element called a DMD (Digital Micromirror Device), or liquid crystal panel, to display 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 and a full-color transmission region that select a portion of the longer wavelength side of the red band light (second band light) and green band light (third band light) synthesized by the dichroic mirror as fourth band light. The control unit synchronously controls the phosphor wheel and the color wheel, adjusting the synchronization 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 also include a dichroic mirror in addition to a phosphor wheel and a color wheel, the optical path of the blue wavelength light used as excitation light and the optical path of light of a different wavelength sometimes become different optical paths. In this case, the estimation device becomes larger, and color inhomogeneity occurs due to errors caused by the different optical paths. Summary of the Invention

[0006] In view of the above, the object of this disclosure is to provide a light source device that enables miniaturization of the device and reduces the generation of color unevenness, and a projection device having the light source device.

[0007] The light source device disclosed herein 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 allows light of a predetermined wavelength band different from the excitation light to pass through and reflects the excitation light, and a transmission bending region that bends the excitation light to pass through; and a fluorescence emitting device that, when irradiated with the excitation light reflected by the filtering region, emits fluorescence including the predetermined wavelength band toward the filtering region, wherein the rotating wheel device is configured such that the optical axis of the excitation light after passing through the transmission bending region overlaps with the optical axis of the fluorescence of the predetermined wavelength band after passing 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 aforementioned light source device and the aforementioned display element.

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

[0010] Figure 1 This is a diagram showing the functional circuit blocks 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 cross-sectional view of section IIIb-IIIb.

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

[0015] Figure 4B yes Figure 4A A cross-sectional schematic diagram of a modified example of the shown portion.

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

[0017] Figure 5 This is a top view schematic diagram showing the internal structure of a 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 irradiated by the rotating wheel device of the first embodiment passes through the rotating wheel device.

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

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

[0021] Figure 9A This is a magnified cross-sectional view of the reflective bending area of ​​the rotating wheel device. Figure 9B yes Figure 9A A cross-sectional schematic diagram of a modified example of the shown portion. Figure 9C yes Figure 9A A cross-sectional schematic diagram of another variation of the portion shown.

[0022] Figure 10 This is a top view schematic diagram showing the case where the excitation light irradiated by the rotating wheel device of the third embodiment passes through the rotating wheel device and the case where the excitation light irradiated by the rotating wheel device is reflected by the rotating wheel device and irradiates the fluorescent light emitting area of ​​the fluorescent light emitting device to emit fluorescence.

[0023] Figure 11 This is a top view of the rotating wheel in the third embodiment.

[0024] Figure 12 This is a top view schematic diagram showing the internal structure of the projection device according to the fourth embodiment.

[0025] Figure 13A , Figure 13B This is a schematic diagram showing the rotating wheel device of the fourth embodiment. Figure 13A This is a top view of the rotating wheel. Figure 13B It is shown Figure 13A A cross-sectional view of section XIIIb-XIIIb.

[0026] Figure 14A It is Figure 13B A magnified cross-sectional view of the rotating wheel device, enlarged from the portion enclosed by the dashed line. Figure 14B yes Figure 14A A cross-sectional schematic diagram of a modified example of the shown portion.

[0027] Figure 15 This is a top view schematic diagram showing the case where the excitation light irradiated by the rotating wheel device of the fourth embodiment bends and passes through the rotating wheel device.

[0028] Figure 16 This is a top view schematic diagram showing the situation where the excitation light irradiated by the rotating wheel device of the fourth embodiment passes through the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0029] Figure 17This is a top view schematic diagram showing the case where the excitation light irradiated by the rotating wheel device of the fifth embodiment passes through the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0030] Figure 18 This is a top view schematic diagram showing the situation where the excitation light irradiated by the rotating wheel device of the sixth embodiment is reflected by the rotating wheel device, and the situation where the excitation light irradiated by the rotating wheel device passes through the rotating wheel device and irradiates the fluorescent emitting area of ​​the fluorescent emitting device to emit fluorescence.

[0031] Figure 19A This is an enlarged cross-sectional view of a portion of the rotating wheel device in the sixth embodiment. Figure 19B This is an enlarged cross-sectional view of another part of the rotating wheel device in the sixth embodiment. Detailed Implementation

[0032] (First Implementation)

[0033] The following is for reference Figures 1 to 7 The first embodiment of this disclosure will be described. Figure 1 This is a functional circuit block diagram of the projection device 10. The projection device control unit consists of a CPU including an image conversion unit 23 and a control unit 38, a front-end unit including an input / output interface 22, a display encoder 24, and a display driver unit 26. Image signals of various specifications input from the input / output connector unit 21 are uniformly converted into image signals of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus SB, and then output to the display encoder 24.

[0034] Furthermore, the display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal based on the stored content of the video RAM 25, and outputs it to the display driver unit 26.

[0035] 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 a light image using the reflected light from the display element 50, and then projects the image through 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.

[0036] 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. 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 frame by frame, and outputs it to the display encoder 24 via the image conversion unit 23. Therefore, the image compression / decompression unit 31 can output moving images and the like based on the image data stored in the memory card 32.

[0037] The control unit 38 is responsible for the operation control of each circuit in the projection device 10, and consists of a CPU, a ROM that stores various settings and other operation programs, and RAM used as working memory.

[0038] The button / indicator unit 37 consists of a main key and an indicator located in the housing. Operation signals from the button / indicator unit 37 are directly sent to the control unit 38. Furthermore, button 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.

[0039] 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.

[0040] 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 2 The operation of the light source device 60 is to emit light of a predetermined wavelength required during image generation.

[0041] Furthermore, the control unit 38 enables the cooling fan drive control circuit 43 to detect temperature using multiple temperature sensors provided on the light source device 60, etc., and controls the rotation speed of the cooling fan 81 based on the temperature detection results. The control unit 38 also performs the following controls: using a timer or the like to ensure the cooling fan drive control circuit 43 continues to rotate the cooling fan 81 even after the power to the main body of the projection device 10 is disconnected, or disconnecting the power to the main body of the projection device 10 based on the temperature detection results from the temperature sensors.

[0042] Next, the internal structure of the projection device 10 will be described. Figure 2This 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 refer to the left and right directions relative to the projection direction from the projection port 12a, and front and back refer to the front and back directions relative to the side of the projected object and the direction of the light beam.

[0043] 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 block, a light source control block, etc. Furthermore, 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.

[0044] The light source device 60 includes: an excitation light irradiation device 70, which is a light source of blue band light (first band light) and also a light source of excitation light; a red-green light source device 80, which is a light 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 is composed of the excitation light irradiation device 70, the rotating wheel device 100, and the fixed phosphor 200. Furthermore, 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 after it passes through the rotating wheel device 100.

[0045] 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) 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 a rotating wheel device 100.

[0046] Collimating lenses 73 are respectively disposed on the optical axis of each blue laser diode 71 to convert the emitted light from the blue laser diode 71 into parallel light in a manner that improves the directivity of the light emitted from the blue laser diode 71. Each collimating lens 73 is disposed offset from the optical axis of the corresponding blue laser diode 71 towards the central side of the matrix-like arrangement of the blue laser diode 71. The blue wavelength light emitted from each blue laser diode 71 becomes a beam confined within a predetermined range by the collimating lens 73. Furthermore, optical components such as condenser lenses that converge the blue wavelength light emitted from each blue laser diode 71 via each collimating lens 73 may be disposed in the optical path between the collimating lens 73 and the rotating wheel device 100.

[0047] 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, but optical fibers 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 optical fibers, with an incident portion of the optical fiber arranged on the optical axis of each blue laser diode 71, and an exit portion of the optical fiber arranged towards the rotating wheel device 100. When using the above-described optical fibers, 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, in this embodiment, an example of multiple blue laser diodes 71 is shown, but a single blue laser diode 71 may also be disposed as the excitation light source. Moreover, the excitation light source is not limited to a blue laser diode, as long as it emits light in the first wavelength band. In one embodiment, a blue LED (Light Emitting Diode) may also be used as the excitation light source.

[0048] Here, the structure of the rotating wheel device 100 will be described. The rotating wheel device 100 is positioned in the optical path of the excitation light emitted from the excitation light irradiation device 70 and is located on the exit side of the collimating lens 73. 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, with its central portion supported by a motor shaft 110a of the motor 110. Driven by 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, including the fluorescent light-emitting region 202, so that light emitted from the excitation light irradiation device 70 enters 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 are arranged on the surface side of the rotating wheel 101 (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 facing the plate surface of the rotating wheel 101.

[0049] The rotating wheel 101 is formed of a transparent material such as translucent glass or resin, and is a color wheel having a filter region 104 and a transmission bending region 106. The filter region 104 on the excitation light irradiation device 70 side of the two surfaces of the rotating wheel 101 includes a first filter region 104a and a second filter region 104b. The transmission bending region 106 is located on the excitation light irradiation device 70 side (surface side) of the two surfaces of the rotating wheel 101 and 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 within an angle range of approximately 120 degrees. Furthermore, the proportions of each region—the first filter region 104a, the second filter region 104b, and the transmission bending region 106a—are not limited to an angle range of approximately 120 degrees and can be appropriately varied.

[0050] The first filter region 104a and the second filter region 104b in the filter region 104 are processed with dichroism mirrors to allow light of a portion of the wavelength band of fluorescence emitted from the fluorescent emission region 202 to pass through, while reflecting light of a predetermined wavelength band composed of excitation light and light of another portion of the wavelength band of 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 wavelengths of excitation light. The second filter region 104b allows red wavelength light to pass through, while reflecting blue wavelength light and green wavelength light.

[0051] Figure 3BThis is a schematic cross-sectional view of the rotating wheel 101. The rotating wheel 101 includes an excitation light reflecting region 105 on the side 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.

[0052] The transmission bending region 106 bends the blue wavelength light, which is the excitation light, so that it passes through. The blue wavelength light incident on the transmission bending region 106 is refracted in a manner that guides it toward the light channel 175 described below. Specifically, the blue wavelength 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 below. 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, according to... Figure 4A The arrow indicates the optical path that guides the blue wavelength light incident on the transmission bending region 106. Alternatively, the transmission bending region 106 can be made diffuse to diffuse the blue wavelength light, as needed.

[0053] 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 do so as shown in the example. Figure 4B As shown, a plurality of tiny transmission and refraction components 106b2 (refractive components) with inclined surfaces that refract blue wavelength light and are arranged in a concentric circle are formed in the transmission bending region 106. Furthermore, it is also possible to... 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, according to Figure 4B , Figure 4C The arrow indicates the optical path that guides the blue wavelength light incident into the transmission bending region 106. By providing transmission refraction components 106b and 106c on the plate surface of the rotating wheel 101, the transmission bending region 106 composed of transmission refraction components 106b and 106c can be easily formed.

[0054] The rotating wheel 101 includes a transmission diffuse region 107 on the side opposite to the transmission bending region 106 (the side opposite to the excitation light irradiation device 70). The transmission diffuse region 107 allows blue wavelength light that has passed through the transmission bending region 106 to pass through and diffuse. In one embodiment, the rotating wheel 101 may also not have a transmission diffuse region 107. For example, even if the blue wavelength light is not diffused by the rotating wheel 101, as long as the image quality projected onto the projected object is good, the rotating wheel 101 may not have a transmission diffuse region 107.

[0055] 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 along 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.

[0056] Return to Figure 2 The light-guiding optical system 140 includes a first condensing lens 141 (light-guiding component) and a second condensing lens 142 (light-guiding component). The diameter of the first condensing lens 141 is smaller than that of the second condensing lens 142, and it is disposed between the second condensing lens 142 and the fixed phosphor 200. The first condensing lens 141 and the second condensing lens 142 refract the light beam of the blue band reflected by the filtering area 104 of the rotating wheel device 100 toward the fixed phosphor 200, and converge the light beam emitted from the fixed phosphor 200 toward the rotating wheel device 100. Specifically, the light beam emitted from the fixed phosphor 200 toward the rotating wheel device 100 is converged in such a way that it enters the first filtering area 104a or the second filtering area 104b of the rotating wheel 101.

[0057] The fixed phosphor 200 is composed of a substrate 201 and a fluorescent emitting region 202. The substrate 201 can be formed of a metal material such as copper or aluminum. A flat reflective portion, after mirror finishing by silver evaporation or the like, is formed on the surface of the substrate 201 on the side near the rotating wheel device 100. The fluorescent emitting region 202 is disposed on the reflective portion on the surface of the substrate 201. A first heat sink 150 is provided on the right panel 14 side of the fixed phosphor 200 to cool the fixed phosphor 200.

[0058] The fluorescent luminescent region 202 is composed of a phosphor layer in which phosphor particles are dispersed. The phosphor particles are excited by blue-band light, which serves as the excitation light illuminating the fluorescent luminescent region 202, emitting yellow-band light (second-band light) fluorescence. Part of the excitation light illuminating the fluorescent luminescent region 202 excites the phosphor particles, thereby emitting fluorescence from the fluorescent luminescent region 202; another part 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, if the phosphor particles are excited, they emit fluorescence in all directions, with some emitted directly and others reflected by the substrate 201 and emitted from the phosphor region 202.

[0059] The yellow-band fluorescence emitted from the phosphor region 202 and entering the filter region 104 of the rotating wheel device 100 is split by the filter region 104 into light of a predetermined band 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 passes through the rotating wheel 101.

[0060] Furthermore, in this embodiment, the light source device 60 is configured to have a red-green light source device 80, but a red light source device emitting red light can also be provided separately, and the fluorescent emitting region 202 of the fixed phosphor 200 can be made of a phosphor layer emitting green fluorescence. In this case, 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 instead of the filter region 104. Moreover, a dichroic mirror that transmits blue and green light and reflects red light is arranged between the light guiding optical system 140 and the light channel 175. The red light source device has a red light source composed of a red light-emitting diode or other semiconductor light-emitting element, and the red light source device is configured to emit red light from the back panel 13 toward the dichroic mirror in the direction of the front panel 12. The red light reflected by the dichroic mirror enters the light channel 175. Green fluorescence from solid phosphor 200 passes through the filter region and the dichroic mirror and enters the light channel 175. Blue light, after being bent by the transmission bending region 106, passes through the dichroic mirror and enters the light channel 175.

[0061] The light source optical system 170 consists of a light channel 175 as a light guide component, a third condenser lens 178, a fourth condenser lens 179, an illumination reflector 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.

[0062] The light channel 175, the third condenser lens 178, the fourth condenser lens 179, and the illumination reflector 185 are sequentially arranged on the optical axis on the left side panel 15 of the rotating wheel device 100. The light beam emitted from the emission outlet of the light channel 175 is focused by the third condenser lens 178 and the fourth condenser lens 179, and then passes through the illumination reflector 185 and the converging lens 195 to illuminate the display element 50 at a predetermined angle.

[0063] Furthermore, in this embodiment, an example is shown where the light channel 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 channel 175. By using a light guide rod instead of the light channel 175, light can be guided efficiently. Moreover, as a variation of this embodiment, it is also possible to... Figure 5 As shown, a microlens array 90 is configured to replace the optical channel 175, and a concave lens 181 is configured to replace the third condenser lens 178. By using the microlens array 90, space can be saved compared to using the optical channel 175, etc.

[0064] The projection optical system 220 consists of a converging lens 195, a movable lens group 235, and a fixed lens group 225. The fixed lens group 225, which is located 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 moved manually or automatically, thereby enabling zoom or focus adjustment.

[0065] Next, the emission and injection of light from the rotating wheel device 100 will be explained. First, based on... Figure 6 The case of blue-band light emitted from the rotating wheel device 100 as excitation light will be explained. Here, the excitation light ( Figure 6 The position of the rotating wheel 101 into which the light L1 (shown as a solid line) enters is designated as the illumination point S1 (also refer to...). Figure 3A ). Figure 6 In the middle, the transmission bending region 106 of the rotating wheel 101 is located at the irradiation point S1.

[0066] Excitation light emitted from the excitation light irradiation device 70 is incident obliquely onto 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 onto the rotating wheel 101 is incident into the transmission bending region 106 of the rotating wheel 101. The excitation light incident into the transmission bending region 106 is bent towards the light channel 175 side by the transmission bending region 106 and passes through the transmission bending region 106, and is diffused and passed through the transmission diffusion region 107, and then emitted towards the light channel 175. In this way, the excitation light, which becomes blue wavelength light, can be used as a light source.

[0067] Next, based on Figure 7 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 will be explained. 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.

[0068] Excitation light emitted from the excitation light irradiation device 70 and incident obliquely relative to the plate surface of the rotating wheel 101 is directed into 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 into the filter region 104 is reflected by the filter region 104 to the guide optical system 140.

[0069] Excitation light reflected from the 140-degree side of the guide optical system ( Figure 7 Light L2 (shown as a 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, before 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 inclined angle relative to the surface of the fixed phosphor 200 including the fluorescent emitting region 202, thereby enabling the excitation light reflected from the filter region 104 to be converged using the first condenser lens 141 and the second condenser lens 142. When the excitation light is irradiated onto the phosphor particles in the fluorescent emitting region 202, fluorescence in the yellow band is emitted in all directions. Figure 7 The light L3 is indicated by the single-dotted line. Here, in the light emitted from the fluorescent emitting region 202, there is yellow-band fluorescence and excitation light that is directly reflected by 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 fluorescence emitted towards the light source optical system 140 from the residual excitation light and the residual excitation light are converged by the first condenser lens 141 and the second condenser lens 142 and injected into the rotating wheel 101.

[0070] When the first filter region 104a is located at the illumination point S1 of the rotating wheel 101, the red-band fluorescence in the yellow-band fluorescence is reflected and removed by the first filter region 104a, while the green-band fluorescence passes through the first filter region 104a. Additionally, a portion of the residual excitation light incident on the first filter region 104a is reflected and removed by the first filter region 104a. Furthermore, the residual excitation light that is not removed by the first filter region 104a and passes through is reflected and removed by the excitation light reflection region 104c. Similarly, when the second filter region 104b is located at the illumination point S1, the green-band fluorescence in the yellow-band fluorescence is reflected and removed by the second filter region 104b, while the red-band fluorescence passes through the second filter region 104b. A portion of the residual excitation light incident on the second filter region 104b is reflected and removed by the second filter region 104b. Furthermore, the residual excitation light that is not removed by the second filter region 104b and passes through is reflected and removed by the excitation light reflection region 104c. Thus, by passing through the excitation light reflection region 104c, it is possible to obtain red and green wavelength light with almost all residual excitation light removed. Figure 7 (Light L4 is shown in the image with 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 residual excitation light is removed to the level allowed by the first filter region 104a and the second filter region 104b.

[0071] The red and green wavelengths of light passing through the filtering region 104 are emitted toward the optical channel 175. At this time, the optical paths of the red and green wavelengths of light from the rotating wheel device 100 toward the optical channel 175 are the same as the optical path of the excitation light from the rotating wheel device 100 toward the optical channel 175. That is, the rotating wheel device 100 is configured such that the optical axis of the excitation light passing through the transmission bending region 106 overlaps with the optical axes of the red and green wavelengths of light passing through the filtering region 104 at the same position and angle.

[0072] As described above, in the light source device 60, the optical path of the blue wavelength light (which is the excitation light), the optical path of the red wavelength light (which is different from the excitation light), and the optical path of the green wavelength light become the same optical path. Therefore, compared to existing light source devices where the optical paths of the excitation light and the wavelength light are different, the number of components can be reduced, enabling miniaturization and increased efficiency. Furthermore, in the light source device 60, color unevenness caused by errors resulting from the optical paths of the excitation light and the wavelength light being different is reduced. Moreover, since the rotating wheel 101 has a transmission bending region 106 that bends the excitation light for transmission, components for bending the excitation light are not required, further enabling miniaturization of the device.

[0073] Furthermore, in the light source device 60, when blue light, which serves as excitation light, is emitted towards the light source optical system 170, the blue light can be guided towards the light source optical system 170 without passing through the fixed phosphor 200 by bending the blue light in the transmission bending region 106a of the rotating wheel device 100. Therefore, the light path of the blue light and the light path of the fluorescence emitted from the fixed phosphor 200 do not overlap between the rotating wheel device 100 and the fixed phosphor 200, eliminating the need for a separate structure that uses a color wheel or similar device to disperse the blue light, thus enabling miniaturization of the device.

[0074] 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.

[0075] Furthermore, the projection device 10 includes: a display element 50, which is illuminated by light from a light source device 60 to generate image light; a projection optical system 220, which projects the image light emitted from the display element 50 onto a projection object such as a screen; and a control unit, which controls the light source device 60 and the display element 50. This enables miniaturization and high efficiency of the device, providing a projection device 10 that reduces color unevenness.

[0076] (Second Implementation)

[0077] Next, refer to Figure 8 Figure 9 illustrates the second embodiment of this disclosure. Furthermore, in the description of the second embodiment, descriptions of structures identical to those in the first embodiment are omitted or simplified. In the light source device of the second embodiment, the rotating wheel device 300 is arranged at an angle parallel to the rotating wheel 301 of the rotating wheel device 300 and the surface of the substrate 201 of the fixed phosphor 200 facing the rotating wheel device 300 (including the surface of the fluorescent light-emitting region 202).

[0078] Furthermore, the filtering region 304 in the rotating wheel 301 includes a first filtering region and a second filtering region on the side of the two plates of the rotating wheel 301 opposite to the side of the excitation light irradiation device 70. On the side opposite to the side of the excitation light irradiation device 70, the first filtering region and the second filtering region are arranged side by side in the circumferential direction with the region (transmission diffuse region 107) on the side opposite to the transmission curved region 106.

[0079] The area on the side of the rotating wheel 301 opposite to the first and second filter areas on the two plates of the rotating wheel 301, on the side of the excitation light irradiation device 70, includes a reflective bending region 305. The reflective bending region 305 reflects excitation light, i.e., blue-band light, that is, 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 into the reflection bending region 305 is diffracted by the reflection diffraction grating 305a. Figure 9A The arrow indicates the reflected light path. The reflected curved region 305 can also be made diffuse to diffuse blue wavelength light, as needed.

[0080] 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 do so as shown in the example. Figure 9B As shown, multiple tiny reflective and refractive components 305b (refractive components) with inclined surfaces that reflect blue wavelength light at a predetermined angle are formed in the reflective bending region 305. Furthermore, it is also possible to... Figure 9C As shown, a reflective and refractive component 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... Figure 9B , Figure 9C The arrow indicates the reflection of the light path.

[0081] Next, based on Figure 8 The emission and injection of light will be described in 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 in the light source device of the second embodiment. Excitation light emitted from the excitation light irradiation device 70 and incident at an angle relative to the plate surface of the rotating wheel 301 is injected into the reflection bending region 305 of the rotating wheel 301. The excitation light incident into 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 toward the guide light optical system 140.

[0082] Excitation light reflected from the 140-degree side of the guide optical system ( Figure 8Light L5 (shown as solid line) is incident sequentially onto the second condenser lens 142 and the first condenser lens 141, with its optical axis aligned with the optical axis 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 perpendicular to the surface of the substrate 201 of the fixed phosphor 200. The yellow-band fluorescence emitted from the fluorescent emitting region 202 due to the excitation light irradiating the region 202 (…) Figure 8 The light L6 (shown by a single-dot-dash line) and the residual excitation light are converged by the first condenser lens 141 and the second condenser lens 142 and directed into 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 surface of the fluorescent light-emitting device 200 including the fluorescent light-emitting region 202, the excitation light reflected by the reflective bending region 305 of the rotating wheel 301 can still irradiate the fluorescent light-emitting region 202. Therefore, compared to the case where the rotating wheel 301 is tilted relative to the fluorescent light-emitting region 202, the design of the light source device 60 can be simplified.

[0083] Fluorescence incident on the reflective bending region 305 of the rotating wheel 301 passes through the reflective bending region 305 and enters the first or second filter region in the filter region 304, thereby splitting into red or green wavelength light, which is then emitted toward the light channel 175. At this time, the optical paths of the red and green wavelength light from the rotating wheel device 300 toward the light channel 175 are the same as the optical path of the excitation light from the rotating wheel device 300 toward the light channel 175. That is, the rotating wheel device 300 is configured such that the optical axis of the excitation light after passing through the transmission bending region 106 overlaps with the optical axes of the red and green wavelength light after passing 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 such that the optical axis of the excitation light after passing through the transmission bending region 106 overlaps with the optical axes of the red and green wavelength light after passing through the filter region 304 at the same position and angle.

[0084] Similarly, in the light source device of the second embodiment, the optical path of the blue band light (which is the excitation light), the optical path of the red band light (which is different from the excitation light), and the optical path of the green band light become the same optical path. This reduces the number of components compared to existing light source devices where the optical paths of the excitation light and the different band light are separate. Therefore, miniaturization and increased efficiency of the device are achieved, and the generation of color unevenness can be reduced.

[0085] (Third Implementation)

[0086] Next, refer to Figure 10 and Figure 11The third embodiment of this disclosure will be described. Furthermore, in the description of the third embodiment, descriptions of structures 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 the motor. A flat reflective portion, after mirror finishing by silver evaporation or the like, is formed on the light-guiding optical system 140 side of the two plates of the fluorescent wheel 401. The fluorescent light-emitting region 402 is arranged in a ring on the reflective portion of the surface of the fluorescent wheel 401.

[0087] And, as Figure 11 As shown, the rotating wheel 501 in the rotating wheel device 500 includes a filter region 504 and a transmission bending region 506 on the side of the excitation light irradiation device 70 on both surfaces of the rotating wheel 501. 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 within an angle range of approximately 90 degrees.

[0088] 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.

[0089] 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. Furthermore, the rotating wheel 501 includes a transmission diffuse region 507 on the side opposite to the transmission bending region 506. In the light source device of this embodiment, according to the color tone design, the fluorescence emitted from the fluorescent emitting region 402 is allowed to pass through the third filtering region 504c of the filtering region 504, thereby guiding yellow-band light to the light source optical system side. In one embodiment, the rotating wheel 501 may not have the transmission diffuse region 507, nor may it have the excitation light reflection region 505.

[0090] like Figure 10As shown, in the light source device of the third embodiment, the optical path of the blue band light (which is the excitation light), the optical path of the red band light (which is different from the excitation light), the optical path of the green band light, and the optical path of the yellow band light are also the same optical path. 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 after passing 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 after passing 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 can be obtained (achieving miniaturization and efficiency of the device, and reducing color unevenness).

[0091] 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 the yellow wavelength light as needed. In addition, by using the fluorescent wheel device 400, the heat generated by the irradiation of the excitation light can be suppressed from concentrating on a portion of the fluorescent light-emitting region 402.

[0092] 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 a fluorescent light-emitting device. Additionally, in one embodiment, in the first and second embodiments described above, a reference device may also be used. Figure 10 and Figure 11 The structure of the rotating wheel 501 is described. Specifically, the filter region 104 (or filter region 304) may also have a third filter region, identical to the third filter region 504c, 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 allows yellow light to pass through and reflects 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.

[0093] (Fourth Implementation)

[0094] Next, refer to Figures 12-16 The fourth embodiment of this disclosure will be described. Furthermore, in the description of the fourth embodiment, descriptions of structures identical to those in the first embodiment are 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 on the left side 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.

[0095] The light source device 560 includes: an excitation light irradiation device 70, which is both a source of blue-band light (first-band light) and an excitation light source; 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 600; and a fixed phosphor 200 (fluorescent light-emitting device). The excitation light irradiation device 70 is arranged facing the plate surface of the rotating wheel 601 of the rotating wheel device 600, and the fixed phosphor 200 (fluorescent light-emitting device) is arranged facing the plate surface of the rotating wheel 601 opposite to the excitation light irradiation device 70. The structure and function of the excitation light irradiation device 70 are the same as in the first embodiment. The red-green light source device 80 is composed of the excitation light irradiation device 70, the rotating wheel device 600, and the fixed phosphor 200. Furthermore, the light source device 560 is equipped with: a light guiding optical system 140, which guides the excitation light after passing through the rotating wheel device 600 to the side of the fixed phosphor 200, and guides the fluorescence emitted from the fluorescence emission region 202 of the fixed phosphor 200 to the side of the rotating wheel device 600; and a light source optical system 170, which guides the light after passing through the rotating wheel device 600.

[0096] Next, the structure 601 of the rotating wheel in the rotating wheel device 600 will be described. The rotating wheel 601 is formed of a transparent material such as translucent glass or resin, and is a color wheel having a light-filtering region 604 and a transmissive bending region 606. The structure 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) opposite to the excitation light irradiation device 70 among the two plates of the rotating wheel 601, includes a first filtering region 604a and a second filtering region 604b. The transmission bending region 606 is located on the side (surface side) opposite to the excitation light irradiation device 70 among the two plates of the rotating wheel 601 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 example shown, they are configured within an angle range of approximately 120 degrees. Furthermore, the proportions of each region—the first filter region 604a, the second filter region 604b, and the transmission bending region 606—are not limited to an angle range of approximately 120 degrees and can be appropriately varied.

[0097] The first filter region 604a and the second filter region 604b in the filter region 604 are processed with dichroism mirrors to reflect a portion of the wavelength band of the fluorescence emitted from the fluorescent emission region 202, while allowing light of a predetermined wavelength band composed 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 wavelengths 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.

[0098] The transmission bending region 606 bends the blue wavelength light, which is the excitation light, so that it passes through. The blue wavelength light incident on the transmission bending region 606 is refracted in a manner that guides it toward the light channel 175 described below. Specifically, the blue wavelength 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 below. 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 grooves 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 by... Figure 14A The arrow indicates the optical path guide. The transmission bending region 606 can also be made diffuse to diffuse blue wavelength light as needed.

[0099] Furthermore, in this embodiment, an example is shown where a transmission bending region 606 is provided 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 region on the back side of the rotating wheel 601 that does not correspond to the filter region 604, and a transmission diffusing region 607 is provided in the region of the surface of the rotating wheel 601 corresponding to the transmission bending region 606, which allows blue wavelength light passing 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 is diffused by the transmission bending region 606. Figure 14B The arrow indicates the optical path guidance. In one embodiment, the transmission bending region 606 can also be applied. Figure 4B , Figure 4C The structure shown. That is, multiple tiny transmission and refraction components arranged concentrically with inclined surfaces that refract blue wavelength light can be formed in the transmission bending region 606, or a single transmission and refraction component with an inclined surface that refracts blue wavelength light can be formed. Additionally, in one embodiment, it is also possible to... Figure 14BThe structure does not include a transmission and diffusion region 607. For example, even if blue light does not diffuse on the rotating wheel 601, as long as the image quality projected onto the projected object is good, the transmission and diffusion region 607 may not be required.

[0100] The rotating wheel device 600 is configured such that the optical axis of the blue light transmitted through the transmission bending region 606 overlaps with the optical axis of the fluorescence reflected by the filter region 604 (first filter region 104a or second filter region 604b). That is, the rotating wheel device 600 has the function of combining the blue light transmitted through the transmission bending region 606 with the green and red light reflected by the filter region 604 along 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 such that the optical axis of the blue light transmitted through the transmission bending region 606 overlaps with the optical axis of the fluorescence reflected by the filter region 604.

[0101] The yellow-band fluorescence emitted from the phosphor region 202 and entering the filter region 604 of the rotating wheel device 600 is split by the filter region 604 into light of a predetermined band 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, while 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, while the red-band light is split and reflected by the rotating wheel 601.

[0102] Next, the emission and injection of light from the rotating wheel device 600 will be explained. First, based on... Figure 15 The case of blue-band light emitted from the rotating wheel device 600 as excitation light will be explained. Here, the excitation light ( Figure 15 The position of the rotating wheel 601 into which the light L7 (shown by solid lines) enters is designated as the illumination point S2 (also refer to...). Figure 13A ). Figure 15 In the middle, the transmission bending region 606 of the rotating wheel 601 is located at the irradiation point S2.

[0103] Excitation light emitted from the excitation light irradiation device 70 is incident at an angle relative to the back surface of the rotating wheel 601. When the transmission bending region 606 is located at the irradiation point S2, the excitation light incident at an angle relative to the rotating wheel 601 is incident into the transmission bending region 606 of the rotating wheel 601. The excitation light incident into the transmission bending region 606 bends towards the light channel 175 side and passes through the transmission bending region 606, and then exits towards the light channel 175. In this way, the excitation light, which becomes blue wavelength light, 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 at an angle relative to the rotating wheel 601 bends in the transmission bending region 606, then diffuses in the transmission diffusion region 607, and exits towards the light channel 175.

[0104] Next, based on Figure 16 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 will be explained. 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.

[0105] Excitation light emitted from the excitation light irradiation device 70 and incident at an angle relative to the plate surface (back side) of the rotating wheel 601 is directed into 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 into the filter region 604 is transmitted through the filter region 604 without bending and exits to the side of the guide light optical system 140.

[0106] The excitation light emitted from the guide optical system 140 side ( Figure 16 Light L8 (shown as solid line) enters from its front towards the second condenser lens 142, passes through the second condenser lens 142 and the first condenser lens 141 in sequence, and then illuminates the fluorescent emitting region 202 of the fixed phosphor 200. In the light source device 560, the excitation light irradiation device 70 is arranged opposite the surface of the fixed phosphor 200 including the fluorescent emitting region 202, separated by a rotating wheel 601, thereby allowing the excitation light after passing through the filter light region 604 to enter from its front towards the first condenser lens 141 and the second condenser lens 142. When the excitation light is irradiated onto the phosphor particles in the fluorescent emitting region 202, yellow fluorescence is emitted in all directions. Figure 16The light L9 is indicated by a single dotted line. Here, in the light emitted from the fluorescent emitting region 202, there is yellow-band fluorescence and residual excitation light that is directly reflected by the substrate 201 without irradiating the phosphor particles. The fluorescence emitted from the phosphor region 202 and the fluorescence emitted towards the light source optical system 140 from the residual excitation light are converged by the first condenser lens 141 and the second condenser lens 142 and enter from the surface of the rotating wheel 601.

[0107] When the first filter region 604a is located at the illumination point S2 of the rotating wheel 601, the red fluorescence in the yellow band fluorescence is transmitted through the first filter region 604a and removed, while 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 passing 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 band fluorescence is transmitted through the second filter region 604b and removed, while the red fluorescence is reflected by the second filter region 604b. Residual excitation light incident on the second filter region 604b is removed by passing through the second filter region 604b. Thus, it is possible to obtain red and green band light with almost no residual excitation light removed. Figure 16 The light L10 is shown in the middle with a single-dot dashed line.

[0108] The red and green light reflected by the filter region 604 is emitted toward the light channel 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, including the fluorescent light-emitting region 202, thereby guiding the red and green light reflected by the filter region 604 to the light channel 175. At this time, the optical path of the red and green light from the rotating wheel device 601 toward the light channel 175 is the same as the optical path of the excitation light from the rotating wheel device 600 toward the light channel 175. That is, the rotating wheel device 600 is arranged at a position and angle where the optical axis of the excitation light after passing through the transmission curved region 606 overlaps with the optical axis of the red and green light reflected by the filter region 604.

[0109] As described above, in the light source device 560, the optical paths of the blue wavelength light (which is the excitation light), the red wavelength light (different from the excitation light), and the green wavelength light become the same optical path. This reduces the number of components compared to conventional light source devices where the optical paths of the excitation light and the wavelength light are different, enabling miniaturization and increased efficiency. Furthermore, the light source device 560 reduces color unevenness caused by errors resulting from the optical paths of the excitation light and the wavelength light being different. Moreover, since the rotating wheel 601 has a transmission bending region 606 that bends the excitation light for transmission, a separate component for bending the excitation light is unnecessary, further enabling miniaturization of the device.

[0110] 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 guidance of the excitation light emitted from the excitation light irradiation device 70 into the optical system 140, thereby increasing the freedom of arrangement of the excitation light irradiation device 70 and enabling easy adjustment of the optical axis.

[0111] (Fifth Implementation)

[0112] Next, refer to Figure 17 The fifth embodiment of this disclosure will be described. Furthermore, in the description of the fifth embodiment, descriptions of structures identical to those in the fourth embodiment are omitted or simplified. The configuration and structure of the excitation light irradiation device 70, the fixed phosphor 200, the light guiding optical system 140, and the rotating wheel device 700 in the fifth embodiment differ from those in the fourth embodiment. For example... Figure 7 As shown, in the light source device 660, the excitation light irradiation device 70 is arranged opposite to the light channel 175 such that the light channel 175 is located on the optical axis of the excitation light emitted from the excitation light irradiation device 70.

[0113] 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 including the fluorescent light-emitting region 202, so that light emitted from the excitation light irradiation device 70 enters obliquely relative to the plate surface (back side) of the rotating wheel 701. The rotating wheel 701 includes a light-filtering region 704 and a transmission bending region 706 in the same area of ​​its plate surface. That is, the rotating wheel 701 includes a light-filtering region 704 on the side (surface side) opposite to the excitation light irradiation device 70 in one of its two plate surfaces, and a transmission bending region 706 in the area on the back side corresponding to the light-filtering region 704. Furthermore, the light-filtering region 704 includes a first light-filtering region and a second light-filtering region arranged side-by-side in the circumferential direction of the rotating wheel 701. The functions of the light-filtering region 704, the transmission bending region 706, the first light-filtering region, and the second light-filtering region are the same as in the fourth embodiment.

[0114] Furthermore, an excitation light transmission region 707 is provided on the side of the excitation light irradiation device 70 (back side) of 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. Alternatively, the excitation light transmission region 707 can be made to have diffusing properties that 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. In another embodiment, the excitation light transmission region 707 can be provided on the surface side of the rotating wheel 701 or on both sides of the rotating wheel 701.

[0115] 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. Furthermore, 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.

[0116] The rotating wheel device 700 is configured such that the optical axis of the blue light transmitted through the excitation light transmission region 707 overlaps with the optical axis of the fluorescence reflected by the filter region 704 (first filter region or second filter region). That is, the rotating wheel device 700 has the function of combining the blue light transmitted through the excitation light transmission region 707 with the green and red light reflected by the filter region 704 along the same optical axis.

[0117] Next, the emission and injection of light from the rotating wheel device 700 in the fifth embodiment will be described. First, the case where blue-band light 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 into which the excitation light is injected. The excitation light emitted from the excitation light irradiation device 70 is injected obliquely relative to the plate surface (back side) of the rotating wheel 701. When the excitation light transmission region 707 is located at the irradiation point, the excitation light injected obliquely relative to the rotating wheel 701 is injected into the excitation light transmission region 707 of the rotating wheel 701. The excitation light injected into the excitation light transmission region 707 passes through the excitation light transmission region 707 without bending and is emitted toward the light channel 175 side. In this way, the excitation light, which becomes blue-band light, can be used as a light source.

[0118] Next, the cases of fluorescence emitting green-band light from the rotating wheel device 700 and fluorescence emitting red-band light 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 back side. The excitation light emitted from the excitation light irradiation device 70 and incident obliquely relative to the plate surface (back 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 to the guide optical system 140 side, passes through the transmission bending region 706 and the filter region 704, and then is emitted to the guide optical system 140 side.

[0119] The excitation light emitted from the guide optical system 140 side ( Figure 17 Light L11 (shown as solid line) 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 then illuminates the fluorescent emitting region 202 of the fixed phosphor 200. If excitation light is irradiated onto the phosphor particles in the fluorescent emitting region 202, it emits yellow fluorescence in all directions. Figure 17 The light L12 is indicated by the single-dotted line. The fluorescence emitted from the phosphor region 202 and the fluorescence emitted from the residual excitation light toward the light source optical system 140 side are converged by the first condenser lens 141 and the second condenser lens 142 and enter the rotating wheel 701 from its surface.

[0120] 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, the red fluorescence is reflected by the second filter region. The red and green light reflected by the filter region 704 are emitted towards the light channel 175. At this time, the optical paths of the red and green light from the rotating wheel device 700 towards the light channel 175 are the same as the optical path of the excitation light from the rotating wheel device 700 towards the light channel 175.

[0121] As described above, in the light source device 660 of this embodiment, the rotating wheel 701 includes: a filter region 704, which is located on the opposite side of the surface corresponding to the transmission bending region 706, reflecting green and red fluorescence and allowing excitation light to pass through; and an excitation light transmission region 707, located in a region different from the transmission bending region 706, allowing excitation light to pass through. Furthermore, the rotating wheel device 700 is configured such that the optical axis of the excitation light after passing through the excitation light transmission region 707 overlaps with the optical axes of the green and red fluorescence reflected by the filter region 704. Therefore, similar to the fourth embodiment, compared to conventional light source devices, the number of components can be reduced, enabling miniaturization and increased efficiency of the device. Furthermore, it can reduce color unevenness caused by errors resulting from the excitation light's optical path and the optical path of light of a different wavelength being different optical paths.

[0122] 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, the excitation light can be easily irradiated onto the fixed phosphor 200.

[0123] (Sixth Implementation Method)

[0124] Next, refer to Figure 18 Figure 19 illustrates the sixth embodiment of this disclosure. Furthermore, in the description of the sixth embodiment, descriptions of structures identical to those in the fourth embodiment are omitted or simplified. The configuration and structure of the excitation light irradiation device 70, the fixed phosphor 200, the light guiding optical system 140, and the rotating wheel device 800 in the sixth embodiment 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 channel 175, separated by the rotating wheel device 800.

[0125] The rotating wheel 801 in the rotating wheel device 800 is arranged at an inclined angle relative to the surface of the fixed phosphor 200, including the fluorescent light-emitting region 202, so that light emitted from the excitation light irradiation device 70 enters at an angle relative to the plate surface (surface) of the rotating wheel. Figure 19A As shown, the rotating wheel 801 includes a light-filtering region 804 and a transmission-bending region 806 in the same area on its plate surface. That is, the rotating wheel 801 includes a light-filtering region 804 on the side of the excitation light irradiation device 70 (surface side) on both plates, and a transmission-bending region 806 in the region on the back side corresponding to the light-filtering region 804. Furthermore, the light-filtering region 804 includes a first light-filtering region and a second light-filtering region arranged side-by-side in the circumferential direction of the rotating wheel 801. Figure 19AAs indicated by the arrow, blue band light incident from the surface of the rotating wheel 801 into the filter area 804 passes through the filter area 804 and is bent by the transmission bending area 806, and then passes through the transmission bending area 806.

[0126] Here, the functions of the transmission bending region 806, the first filtering region, and the second filtering region in the filtering region 804 in the sixth embodiment 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 transmission bending region 806 include volume holograms and diffraction gratings with a stacked structure. Furthermore, the first filtering region allows green and blue light to pass through, while reflecting red light. The second filtering region allows red and blue light to pass through, while reflecting green light.

[0127] like Figure 19B As shown, on the side of the excitation light irradiation device 70 (surface side) of the two plates of the rotating wheel 801, in a region different from the filter region 804 and the transmission bending region 806, an excitation light reflection region 805 is provided. The excitation light reflection region 805 reflects the blue wavelength light used as excitation light. Alternatively, the excitation light reflection region 805 can be made to have a diffusing property that diffuses the blue wavelength light, as needed. Figure 19B As shown by the arrow, blue wavelength light incident from the surface of the rotating wheel 801 onto the excitation light reflection region 805 is reflected by the excitation light reflection region 805.

[0128] The rotating wheel device 800 is configured such that the optical axis of the blue light reflected by the excitation light reflection region 805 overlaps with the optical axis of the fluorescence after passing through the filtering region 804 (the first filtering region or the second filtering region). That is, the rotating wheel device 800 has the function of combining the blue light reflected by the excitation light reflection region 805 with the green and red light from the filtering region 804 along the same optical axis. Specifically, the excitation light irradiation device 70, the rotating wheel device 800, and the fixed phosphor 200 (fluorescent emission device) are configured such that the optical axis of the blue light reflected by the excitation light reflection region 805 overlaps with the optical axis of the fluorescence after passing through the filtering region 804.

[0129] Next, based on Figure 18The emission and injection of light from the rotating wheel device 800 in the sixth embodiment will be explained. First, the case where blue-band light as excitation light is emitted from the rotating wheel device 800 will be explained. In this case, the excitation light reflection region 805 of the rotating wheel 801 is located at the irradiation point on the rotating wheel 801 into which the excitation light is injected. The excitation light emitted from the collimating lens 73 of the excitation light irradiation device 70 is injected obliquely relative to the surface of the rotating wheel 801. When the excitation light reflection region 805 is located at the irradiation point, the excitation light injected obliquely relative to the rotating wheel 801 is injected into the excitation light reflection region 805 of the rotating wheel 801. The excitation light injected into the excitation light reflection region 805 is reflected by the excitation light reflection region 805 towards the light channel 175 side. In this way, the excitation light, which becomes blue-band light, can be used as a light source.

[0130] Next, the cases of fluorescence emitting green-band light from the rotating wheel device 800 and fluorescence emitting red-band light 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 back 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 passes through the filter region 804, and while being bent by the transmission bending region 806 towards the guide optical system 140, it passes through the transmission bending region 806 and is emitted towards the guide optical system 140.

[0131] The excitation light emitted from the guide optical system 140 side ( Figure 18 Light L13 (shown as solid line) 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 emitting region 202 of the fixed phosphor 200. If excitation light is irradiated onto the phosphor particles in the fluorescent emitting region 202, it emits yellow fluorescence in all directions. Figure 18 The light L14 is indicated by the single-dotted line. The fluorescence emitted from the phosphor region 202 and the fluorescence emitted from the residual excitation light toward the light source optical system 140 side are converged by the first condenser lens 141 and the second condenser lens 142 and enter from the back of the rotating wheel 801.

[0132] The fluorescence and residual excitation light incident from the back of the rotating wheel 801 pass through the transmission bending region 806 and enter 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 passes through the first filter region; when the second filter region is located at the illumination point, red-band fluorescence passes through the second filter region. The red-band and green-band light passing through the filter region 804 exit towards the light channel 175. At this time, the optical paths of the red-band and green-band light from the rotating wheel device 800 towards the light channel 175 are the same as the optical path of the excitation light from the rotating wheel device 800 towards the light channel 175.

[0133] As described 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 region on the opposite side of the transmission bending region 806, a filter region 804 that allows both green and red fluorescence to pass through and excitation light to pass through, and an excitation light reflection region 805 located in a region different from the transmission bending region 806 that reflects 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 after passing through the filter region 804. Therefore, similar to the fourth embodiment, compared to conventional light source devices, the number of components can be reduced, and the device can be miniaturized and made more efficient. Furthermore, it can reduce the generation of color unevenness caused by errors resulting from the excitation light's optical path and the optical path of light of a different wavelength from the excitation light becoming different optical paths. In one embodiment, the transmission bending region 806 may 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 may also be provided on the plate surface on the side of the fixed phosphor 200. Additionally, in one embodiment, in the fourth to sixth embodiments, a light guide rod may be used instead of the light channel 175, and a reference may also be configured. Figure 5 The microlens array 90 is used instead of the optical channel 175, and a concave lens 181 is used instead of the third condenser lens 178.

[0134] 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. Additionally, in one embodiment, in the fourth to sixth embodiments described above, the same as described above can be applied. Figure 10 and Figure 11The structure corresponding to the rotating wheel 501 is described. Specifically, in the fourth and fifth embodiments, the filter regions 604 and 704 may also have a third filter region on 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 same side as the first and second filter regions, which transmits yellow light and reflects blue, green, and red light, the same as the third filter region 504c.

[0135] The embodiments described above are provided as examples and are not intended to limit the scope of the invention. The new embodiments described above can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. The above embodiments and their variations are included within the scope and spirit of the invention, and are also included within 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 rotating wheel, the rotating wheel including a filtering region that allows light of a predetermined wavelength different from the excitation light to pass through and reflects the excitation light, and a transmission bending region that bends the excitation light to allow it to pass through; and A fluorescent light-emitting device, which, when illuminated by excitation light reflected from the aforementioned filter region, emits fluorescence including light of the predetermined wavelength toward the filter region. The aforementioned rotating wheel device is configured such that the optical axis of the excitation light after passing through the aforementioned transmission bending region overlaps with the optical axis of the fluorescence of the predetermined wavelength band after passing through the aforementioned filtering region. A diffraction grating is formed in the aforementioned transmission bending region to diffract the excitation light.

2. A light source device, characterized in that, have: An excitation light irradiation device that emits excitation light; A rotating wheel device comprising a rotating wheel, the rotating wheel including a filtering region that allows light of a predetermined wavelength different from the excitation light to pass through and reflects the excitation light, and a transmission bending region that bends the excitation light to allow it to pass through; and A fluorescent light-emitting device, which, when illuminated by excitation light reflected from the aforementioned filter region, emits fluorescence including light of the predetermined wavelength toward the filter region. The aforementioned rotating wheel device is configured such that the optical axis of the excitation light after passing through the aforementioned transmission bending region overlaps with the optical axis of the fluorescence of the predetermined wavelength band after passing through the aforementioned filtering region. A refractive component with an inclined surface that refracts the excitation light is formed in the aforementioned transmission bending region.

3. The light source device according to claim 1 or 2, characterized in that, The aforementioned light source device includes a light guide component that guides the excitation light reflected by the aforementioned filter area to the aforementioned fluorescent light-emitting device.

4. The light source device according to claim 1 or 2, characterized in that, The area of ​​the rotating wheel on the opposite side of the surface corresponding to the aforementioned transmission bending region includes a transmission diffusion region through which the excitation light that has passed through the aforementioned transmission bending region diffuses.

5. The light source device according to claim 1 or 2, characterized in that, The aforementioned rotating wheel is arranged at an inclined angle relative to the fluorescent emitting area including the aforementioned fluorescent emitting device.

6. The light source device according to claim 5, characterized in that, The area on the opposite side of the rotating wheel corresponding to the filtering area includes an excitation light reflection area that allows light of wavelengths other than the excitation light to pass through and reflects the excitation light.

7. The light source device according to claim 1 or 2, characterized in that, The aforementioned filtering region is a reflection bending region that causes the excitation light, which is incident at an angle relative to the aforementioned rotating wheel, to be reflected in the direction normal to the aforementioned rotating wheel.

8. The light source device according to claim 7, characterized in that, The aforementioned rotating wheel is arranged at an angle parallel to the surface of the aforementioned fluorescent light-emitting device, which includes the fluorescent light-emitting area.

9. The light source device according to claim 7, characterized in that, A reflection diffraction grating is formed in the aforementioned reflection bending region to reflect and diffract the excitation light toward the normal direction of the plate surface of the rotating wheel.

10. The light source device according to claim 7, characterized in that, A reflective and refractive component with an inclined surface that reflects the excitation light at a predetermined angle is formed in the aforementioned reflective bending region.

11. The light source device according to claim 1 or 2, characterized in that, It has a light channel or light guide rod that guides the light after it passes through the aforementioned rotating wheel device.

12. The light source device according to claim 1 or 2, characterized in that, It has a microlens array that guides the light that passes through the aforementioned rotating wheel device.

13. The light source device according to claim 1 or 2, characterized in that, The aforementioned fluorescent light-emitting device is a fluorescent wheel device.

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

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