Light source device and projection device

Abstract

To provide a light source device that can reduce color unevenness while reducing the size of the device, and a projection device including the light source device.SOLUTION: A light source device comprises: an excitation light irradiation device 70 that emits excitation light; a rotation wheel device 100 that comprises a rotation wheel 101 including a filter area 104 that reflects or transmits light in a predetermined wavelength band different from the wavelength band of the excitation light and transmits the excitation light, and a transmission and bending area 106 that bends and transmits the excitation light; and a fixed phosphor 200 that is irradiated with the excitation light transmitting through the filter area 104 and emits fluorescent light including the light in the predetermined wavelength band toward the filter area 104. The rotation wheel device 100 is arranged such that an optical axis of the excitation light transmitting through the rotation wheel 101 or reflected on the rotation wheel 101 and an optical axis of the fluorescent light in the predetermined wavelength band reflected in the filter area 104 or transmitting through the filter area 104 overlap each other.SELECTED DRAWING: Figure 16

Description

[Technical Field]

[0001] The present invention relates to a light source device and a projection device. [Background technology]

[0002] Today, projection devices are used to project image data stored on personal computer screens, video screens, memory cards, etc. onto a screen. These projection devices focus light emitted from a light source onto a micromirror display element called a DMD (Digital Micromirror Device) or a liquid crystal panel, and display a color image on the screen.

[0003] For example, Patent Document 1 discloses a light source device including a light source of blue wavelength band light (first wavelength band light), a fluorescent wheel, a dichroic mirror, a color wheel, and a control unit. The color wheel includes a blue-red transmission region that selects red wavelength band light (second wavelength band light) combined by the dichroic mirror and a portion of light on the long wavelength side of green wavelength band light (third wavelength band light) as fourth wavelength band light, and an all-color transmission region. The control unit controls the fluorescent wheel and the color wheel in synchronization with each other and shifts the synchronization position of the color wheel relative to the fluorescent wheel depending on the output mode. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-160149 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in a configuration in which a dichroic mirror is separately arranged in addition to a fluorescent wheel and a color wheel, as in the light source device of Patent Document 1, the optical path of the blue wavelength band light, which is the excitation light, and the optical path of the light of a wavelength band different from the excitation light may be separate. In this case, the device becomes larger, and it is expected that color unevenness will occur due to errors caused by the separate optical paths.

[0006] In view of the above, it is an object of the present invention to provide a light source device that can reduce the occurrence of color unevenness while achieving a miniaturized device, and a projection device that includes this light source device. [Means for solving the problem]

[0007] The light source device of the present invention includes an excitation light irradiating device that emits excitation light and a reflecting device that reflects light in a predetermined wavelength band different from the wavelength band of the excitation light. Shoot a filter region that bends and transmits the excitation light; and a transmission bending region that bends and transmits the excitation light. ,of a rotating wheel device including a rotating wheel including: a fluorescence emitting device that is irradiated with the excitation light that has passed through the filter region and emits a composite light including light of the predetermined wavelength band toward the filter region; Equipped with the combined light includes residual excitation light resulting from the excitation light being reflected by a base material constituting the fluorescence emitting device, and fluorescence emitted when the excitation light is irradiated onto a fluorescence emitting region provided in a predetermined region of the base material, the filter region being provided in a region of the rotating wheel different from the transmission bending region, and reflecting the fluorescence in the predetermined wavelength band and transmitting the residual excitation light; The rotating wheel device bends the excitation light and transmits it. Axis and , reflected in the filter area shooting The predetermined wavelength band The aforementioned It is characterized by being arranged so as to overlap with the optical axis of the fluorescent light.

[0008] The projection device of the present invention is characterized by comprising the above-mentioned 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 projection target, and a control unit that controls the light source device and the display element. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a light source device that can reduce the occurrence of color unevenness while achieving a miniaturized device, and a projection device that includes this light source device. [Brief explanation of the drawings]

[0010] [Figure 1] 2 is a diagram showing functional circuit blocks of the projection device according to the first embodiment. FIG. [Figure 2] 1 is a plan view schematically illustrating the internal structure of a projection device according to a first embodiment. [Figure 3] 1A and 1B are schematic diagrams showing a rotary wheel device according to a first embodiment, in which (a) is a schematic plan view of a rotary wheel, and (b) is a schematic cross-sectional view showing the IIIb-IIIb cross section of (a). [Figure 4] (a) is a schematic cross-sectional view of a rotating wheel device enlarging the portion surrounded by the dashed line in Figure 3(b), (b) is a schematic cross-sectional view of a modified example of the portion shown in (a), and (c) is a schematic cross-sectional view of another modified example of the portion shown in (a). [Figure 5] FIG. 10 is a schematic plan view showing the internal structure of a projection device according to a modified example of the first embodiment. [Figure 6] 3 is a schematic plan view showing how excitation light irradiated onto the rotating wheel device according to the first embodiment passes through the rotating wheel device. FIG. [Figure 7] 1 is a plan view showing a state in which excitation light irradiated onto a rotating wheel device according to the first embodiment is reflected by the rotating wheel device and irradiated onto a fluorescence-emitting region of a fluorescence-emitting device, causing the fluorescence to be emitted. FIG. [Figure 8] A planar schematic diagram showing how excitation light irradiated onto a rotating wheel device in the second embodiment passes through the rotating wheel device, and how the excitation light irradiated onto the rotating wheel device is reflected by the rotating wheel device and irradiated onto the fluorescence emission region of the fluorescence emitting device, causing fluorescence to be emitted. [Figure 9] (a) is a schematic cross-sectional view of an enlarged reflective bending region of a rotating wheel device, (b) is a schematic cross-sectional view of a modified example of the part shown in (a), and (c) is a schematic cross-sectional view of another modified example of the part shown in (a). [Figure 10]A planar schematic diagram showing how excitation light irradiated onto a rotating wheel device of the third embodiment passes through the rotating wheel device, and how the excitation light irradiated onto the rotating wheel device is reflected by the rotating wheel device and irradiated onto the fluorescence emission region of the fluorescence emitting device, causing fluorescence to be emitted. [Figure 11] FIG. 10 is a schematic plan view of a rotating wheel according to a third embodiment. [Figure 12] FIG. 10 is a plan view schematically illustrating the internal structure of a projection device according to a fourth embodiment. [Figure 13] 10A and 10B are schematic diagrams showing a rotary wheel device according to a fourth embodiment, in which (a) is a schematic plan view of a rotary wheel, and (b) is a schematic cross-sectional view showing the XIIIb-XIIIb cross section of (a). [Figure 14] 13(a) is a schematic cross-sectional view of a rotary wheel device in which the portion surrounded by the dashed line in FIG. 13(b) is enlarged, and FIG. 13(b) is a schematic cross-sectional view of a modified example of the portion shown in FIG. 13(a). [Figure 15] 10 is a schematic plan view showing how excitation light irradiated onto a rotary wheel device according to a fourth embodiment is bent and transmitted through the rotary wheel device. FIG. [Figure 16] 10 is a plan view showing how excitation light irradiated onto a rotary wheel device according to a fourth embodiment passes through the rotary wheel device and is irradiated onto a fluorescence-emitting region of a fluorescence-emitting device, causing the fluorescence to be emitted. FIG. [Figure 17] A planar schematic diagram showing how excitation light irradiated onto a rotating wheel device in the fifth embodiment passes through the rotating wheel device, and how excitation light irradiated onto the rotating wheel device passes through the rotating wheel device and is irradiated onto the fluorescence emission region of a fluorescence emitting device to emit fluorescence. [Figure 18] A planar schematic diagram showing how excitation light irradiated onto a rotating wheel device of the sixth embodiment is reflected by the rotating wheel device, and how excitation light irradiated onto the rotating wheel device passes through the rotating wheel device and is irradiated onto the fluorescence emission region of a fluorescence emitting device to emit fluorescence. [Figure 19](a) is a schematic cross-sectional view of an enlarged portion of a rotating wheel device according to the sixth embodiment, and (b) is a schematic cross-sectional view of an enlarged portion of another portion of the rotating wheel device according to the sixth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] (First embodiment) A first embodiment of the present invention will be described below with reference to Figures 1 to 7. Figure 1 is a functional circuit block diagram of a projection device 10. The projection device control unit is made up 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 drive unit 26. Image signals of various standards input from an input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and system bus SB so as to be unified into image signals of a predetermined format suitable for display, and then output to the display encoder 24.

[0012] Furthermore, the display encoder 24 expands and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display driver .

[0013] The display driver 26 drives the display element 50, which is a spatial light modulator (SOM), at an appropriate frame rate in response to 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 forms an optical image using the light reflected from the display element 50 by irradiating a light beam emitted from the light source device 60 onto the display element 50 via a light guide optical system, and projects and displays the image on a projection target such as a screen (not shown) via a projection optical system 220 (see FIG. 2). Note that the movable lens group 235 of the projection optical system 220 can be driven by a lens motor 45 for zoom adjustment and focus adjustment.

[0014] Furthermore, the image compression / expansion unit 31 performs a recording process in which the luminance signal and color difference signal of the image signal are compressed by processes such as ADCT and Huffman coding, and the data is sequentially written to a memory card 32, which is a removable recording medium. Furthermore, the image compression / expansion unit 31 reads image data recorded on the memory card 32 in the playback mode, expands each piece of image data constituting a series of moving images on a frame-by-frame basis, and outputs the expanded data to the display encoder 24 via the image conversion unit 23. Thus, the image compression / expansion unit 31 can output moving images, etc., based on the image data stored in the memory card 32.

[0015] The control unit 38 controls the operation of each circuit in the projection device 10, and is composed of a CPU, a ROM that permanently stores operation programs such as various settings, and a RAM used as a work memory.

[0016] The key / indicator section 37 is composed of main keys and indicators provided on the housing. Operation signals from the key / indicator section 37 are sent directly to the control section 38. In addition, key operation signals from the remote controller are received by the Ir receiving section 35, demodulated into code signals by the Ir processing section 36, and output to the control section 38.

[0017] The control unit 38 is connected to an audio processing unit 47 via a system bus SB. The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts audio data into analog data in the projection mode and playback mode, driving a speaker 48 to emit amplified sound.

[0018] The control unit 38 controls the light source control circuit 41. The light source control circuit 41 individually controls the operations of the excitation light irradiation device 70 of the light source device 60 and the rotary wheel device 100 (see FIG. 2) so that light in a predetermined wavelength band required for image generation is emitted from the light source device 60.

[0019] Furthermore, the control unit 38 causes the cooling fan drive control circuit 43 to detect temperatures using a plurality of temperature sensors provided in the light source device 60, etc., and controls the rotation speed of the cooling fan 81 based on the results of this temperature detection. The control unit 38 also controls the cooling fan drive control circuit 43 to continue rotating the cooling fan 81 using a timer or the like even after the power to the projection device 10 main body is turned off, or to turn off the power to the projection device 10 main body depending on the results of temperature detection by the temperature sensors.

[0020] Next, the internal structure of the projection device 10 will be described. Fig. 2 is a schematic plan view showing the internal structure of the projection device 10. Here, the housing of the projection device 10 is formed in a substantially box shape and includes an upper panel and a lower panel (not shown), a front panel 12, a rear panel 13, a right panel 14, and a left panel 15. In the following description, left and right in the projection device 10 refer to the left and right directions relative to the projection direction from the projection port 12a, and front and rear refer to the front and rear directions relative to the direction of the projection target of the projection device 10 and the traveling direction of the light beam.

[0021] The projection device 10 includes a control circuit board 242 near the left panel 15. This control circuit board 242 includes a power supply circuit block, a light source control block, etc. The projection device 10 also includes a light source device 60 located approximately in the center of the projection device 10, a light source optical system 170 located to the left of the light source device 60, and a projection optical system 220 located between the light source optical system 170 and the control circuit board 242.

[0022] The light source device 60 includes an excitation light irradiation device 70 that is a light source of blue wavelength band light (first wavelength band light) and also a light source of excitation light, a red / green light source device 80 that is a light source of red wavelength band light (third wavelength band light) and green wavelength band light (fourth wavelength band light), a rotating wheel device 100, and a fixed phosphor 200 (fluorescence light-emitting 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. The light source device 60 also includes a light-guiding optical system 140 that guides the excitation light reflected by the rotating wheel device 100 to the fixed phosphor 200 side and guides fluorescence emitted from a fluorescence-emitting region 202 of the fixed phosphor 200 to the rotating wheel device 100 side, and a light source optical system 170 that guides light that has passed through the rotating wheel device 100.

[0023] The excitation light irradiation device 70 can be placed at any position, and in this embodiment, is placed on the front panel 12 side near the center of the projection device 10. 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) which are semiconductor light-emitting elements, and a collimator 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 diode 71, and cools the blue laser diode 71 and the rotary wheel device 100.

[0024] Collimator lenses 73 are disposed on the optical axes of the respective blue laser diodes 71, and convert the light emitted from each blue laser diode 71 into parallel light so as to enhance the directivity of the light. Each collimator lens 73 is disposed offset toward the central blue laser diode 71 arranged in a matrix with respect to the optical axis of the corresponding blue laser diode 71. The blue wavelength band light emitted from each blue laser diode 71 becomes a light beam limited to a predetermined range by the collimator lens 73. Note that an optical member such as a condenser lens that condenses the blue wavelength band light emitted from each blue laser diode 71 via each collimator lens 73 may be disposed on the optical path between the collimator lens 73 and the rotary wheel device 100.

[0025] Although the present embodiment illustrates an example in which the collimator lens 73 is disposed on the optical axis of the blue laser diode 71, an optical fiber may be disposed on the optical axis of the blue laser diode 71. In this case, the excitation light irradiation device 70 further includes an optical fiber, and the incident portion of the optical fiber is disposed on the optical axis of each blue laser diode 71, and the exit portion of the optical fiber is disposed toward the rotary wheel device 100. When the optical fiber is used, the arrangement of each blue laser diode 71 is not limited to the position shown in FIG. 2. In one embodiment, each blue laser diode 71 may be disposed outside the housing of the projection device 10. Furthermore, the present embodiment illustrates an example in which multiple blue laser diodes 71 are disposed, but a single blue laser diode 71 may be disposed as the light source of the excitation light. Furthermore, 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 be used as the excitation light source.

[0026] The configuration of the rotating wheel device 100 will now be described. The rotating wheel device 100 is disposed on the optical path of the excitation light emitted from the excitation light irradiation device 70, on the emission side of the collimator lens 73. The rotating wheel device 100 includes a rotating wheel 101 and a motor 110. As shown in FIGS. 3(a) and 3(b), the rotating wheel 101 is formed in a disk shape, and its center is supported by a motor shaft 110a of the motor 110. When the motor 110 is driven, the rotating wheel 101 rotates around the motor shaft 110a. The rotating wheel 101 is disposed at an inclined angle with respect to a plane including a fluorescent light-emitting region 202 of a fixed phosphor 200 (described later) so that the light emitted from the excitation light irradiation device 70 is incident obliquely on the plate surface (surface) of the rotating wheel 101. In the light source device 60, the excitation light irradiation device 70 and the fixed phosphor 200 (described later) are disposed on the surface side of the rotating wheel 101 (the side opposite to the side on which the motor 110 is disposed). In other words, the excitation light irradiation device 70 and the fixed phosphor 200 are arranged on the same side of the plate surface of the rotating wheel 101, and the excitation light irradiation device 70 and the fixed phosphor 200 (fluorescence light emitting device) are arranged facing the plate surface of the rotating wheel 101.

[0027] The rotating wheel 101 is a color wheel made of a transparent material such as glass or resin, and includes a filter region 104 and a transmissive bending region 106. The filter region 104 includes a first filter region 104a and a second filter region 104b on the side of the rotating wheel 101 facing the excitation light irradiation device 70. The transmissive bending region 106 is provided in a region of the rotating wheel 101 facing the excitation light irradiation device 70 (front side), different from the filter region 104. The first filter region 104a, the second filter region 104b, and the transmissive bending region 106a are arranged side by side in the circumferential direction of the rotating wheel 101, and in the example shown in FIG. 3(a), each of them is disposed within an angular range of approximately 120 degrees. Note that the proportions of the first filter region 104a, the second filter region 104b, and the transmissive bending region 106a are not limited to an angular range of approximately 120 degrees, and may be changed as appropriate.

[0028] The first filter region 104a and the second filter region 104b in the filter region 104 are dichroic mirror processed to transmit light in a portion of the wavelength band of the fluorescence emitted from the fluorescence-emitting region 202 (described later) and reflect light in a predetermined wavelength band consisting of excitation light and light in another portion of the wavelength band of the fluorescence. Specifically, the first filter region 104a transmits green wavelength band light (fourth wavelength band light) and reflects blue wavelength band light (first wavelength band light) and red wavelength band light (third wavelength band light), which are wavelength bands of the excitation light. The second filter region 104b transmits red wavelength band light and reflects blue wavelength band light and green wavelength band light.

[0029] 3(b) is a schematic cross-sectional view of the rotating wheel 101. The rotating wheel 101 includes an excitation light reflecting region 105 in a region on the surface opposite to the first filter region 104a and the second filter region 104b (the surface opposite to the excitation light irradiation device 70). The excitation light reflecting region 105 transmits light in wavelength bands other than the blue wavelength band, which is the wavelength band of excitation light, and reflects light in the blue wavelength band.

[0030] The transparent bending region 106 bends and transmits blue wavelength band light, which is the wavelength band of the excitation light. The blue wavelength band light incident on the transparent bending region 106 is refracted so as to be guided toward the light tunnel 175, which will be described later. Specifically, the blue wavelength band light incident on the transparent bending region 106 is bent at an angle such that its optical axis coincides with the light guide direction of the light guide optical system 170, which will be described later. In this embodiment, as shown in FIG. 4( a), a transmission diffraction grating 106a (diffraction grating) that diffracts blue wavelength band light is formed in the transparent bending region 106. The transmission diffraction grating 106a constituting the transparent bending region 106 can be easily formed by providing grooves on the plate surface of the rotating wheel 101. Due to the formation of the transmission diffraction grating 106a, the blue wavelength band light incident on the transparent bending region 106 is guided along the optical path indicated by the arrow in FIG. 4( a). The transparent bending region 106 may be provided with diffusive properties to diffuse the blue wavelength band light, if necessary.

[0031] In this embodiment, the transparent bending region 106 includes the transparent diffraction grating 106a. However, as shown in FIG. 4(b), the transparent bending region 106 may include a plurality of minute transparent refractive members 106b2 (refracting members) arranged concentrically and having an inclined surface for refracting blue wavelength band light. Alternatively, as shown in FIG. 4(c), the transparent bending region 106 may include a single transparent refractive member 106c having an inclined surface for refracting blue wavelength band light. In this case, the blue wavelength band light incident on the transparent bending region 106 is guided along the optical path indicated by the arrows in FIGS. 4(b) and 4(c). The transparent bending region 106, which includes the transparent refractive members 106b and 106c, can be easily formed by providing the transparent refractive members 106b and 106c on the surface of the rotating wheel 101.

[0032] The rotating wheel 101 includes a transmissive diffusion region 107 in a region on the surface opposite to the transmissive bending region 106 (the surface opposite to the excitation light irradiation device 70 side). The transmissive diffusion region 107 transmits and diffuses the blue wavelength band light that has passed through the transmissive bending region 106. In one embodiment, the rotating wheel 101 does not need to have the transmissive diffusion region 107. For example, if the image quality of the image projected onto the projection target is good even if the blue wavelength band light is not diffused by the rotating wheel 101, the rotating wheel 101 does not need to have the transmissive diffusion region 107.

[0033] The rotating wheel device 100 is arranged so that the optical axis of the blue wavelength band light that has been bent by the transparent bending region 106 and transmitted through the transparent bending region 106 overlaps with the optical axis of the fluorescence that has been transmitted through the first filter region 104a or the second filter region 104b. That is, the rotating wheel device 100 has a function of combining the blue wavelength band light that has been transmitted through the transparent bending region 106 with the green wavelength band light and the red wavelength band light that have been transmitted through the filter region 104 onto the same optical axis. Specifically, the excitation light irradiation device 70, the rotating wheel device 100, and the fixed phosphor 200 (fluorescence light-emitting device) are arranged so that the optical axis of the blue wavelength band light that has been transmitted through the transparent bending region 106 overlaps with the optical axis of the fluorescence that has been transmitted through the filter region 104.

[0034] Returning to FIG. 2 , the light-guiding optical system 140 includes a first condenser lens 141 (light-guiding member) and a second condenser lens 142 (light-guiding member). The first condenser lens 141 has a smaller diameter than the second condenser lens 142 and is disposed between the second condenser lens 142 and the fixed phosphor 200. The first condenser lens 141 and the second condenser lens 142 refract a light beam of blue wavelength band light reflected by the filter region 104 of the rotating wheel device 100 toward the fixed phosphor 200, and condense a light beam emitted from the fixed phosphor 200 toward the rotating wheel device 100 side. Specifically, the light beam emitted from the fixed phosphor 200 toward the rotating wheel device 100 side is condensed so as to be incident on the first filter region 104 a or the second filter region 104 b of the rotating wheel 101.

[0035] The fixed phosphor 200 is composed of a base material 201, a fluorescent light-emitting region 202, etc. The base material 201 can be made of a metal material such as copper or aluminum. A flat reflective portion that is mirror-finished by silver deposition or the like is formed on the surface of the base material 201 that faces the rotary wheel device 100. The fluorescent light-emitting region 202 is disposed on the reflective portion on the surface of the base material 201. A first heat sink 150 is provided on the right panel 14 side of the fixed phosphor 200, and cools the fixed phosphor 200.

[0036] The fluorescent light-emitting region 202 is made of a phosphor layer in which phosphor particles are dispersed. The phosphor particles are excited by blue wavelength band light irradiated onto the fluorescent light-emitting region 202 as excitation light, and emit fluorescence in a yellow wavelength band light (second wavelength band light). A portion of the excitation light irradiated onto the fluorescent light-emitting region 202 excites the phosphor particles, causing the fluorescent light-emitting region 202 to emit fluorescence. Another portion of the excitation light is reflected by the reflective portion of the mirror-finished substrate 201 and excites the phosphor particles, but 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 light-emitting region 202. When the phosphor particles are excited, fluorescence is emitted in all directions, some of which is emitted directly and the other portion is reflected by the substrate 201 and emitted from the fluorescent region 202.

[0037] The yellow wavelength band fluorescence emitted from the phosphor region 202 and incident on the filter region 104 of the rotating wheel device 100 is separated into light of a predetermined wavelength band different from the wavelength band of the excitation light by the filter region 104. Specifically, the yellow wavelength band fluorescence contains red wavelength band light and green wavelength band light, and the red wavelength band light is reflected and removed by the first filter region 104a and the green wavelength band light is separated, and the green wavelength band light is reflected and removed by the second filter region 104b and the red wavelength band light is separated and transmitted through the rotating wheel 101.

[0038] In this embodiment, the light source device 60 includes the red-green light source device 80. However, a separate red light source device emitting red wavelength band light may be provided, and the fluorescent light-emitting region 202 of the fixed phosphor 200 may be formed of a phosphor layer emitting fluorescence in the green wavelength band. In this case, the rotating wheel 101 of the rotating wheel device 100 includes a filter region that reflects blue wavelength band light and transmits green wavelength band light, and a transmission bending region 106, instead of the filter region 104. A dichroic mirror that transmits blue and green wavelength band light and reflects red wavelength band light is disposed between the light-guiding optical system 140 and the light tunnel 175. The red light source device includes a red light source formed of a semiconductor light-emitting element such as a red light-emitting diode, and is disposed so that the emitted red wavelength band light is directed toward the dichroic mirror from the rear panel 13 toward the front panel 12. The red wavelength band light reflected by the dichroic mirror enters the light tunnel 175. Fluorescence in the green wavelength band from solid phosphor 200 passes through the filter region and the dichroic mirror and enters light tunnel 175. Light in the blue wavelength band that is bent and transmitted by transmission bending region 106 passes through the dichroic mirror and enters light tunnel 175.

[0039] The light source optical system 170 is composed of a light tunnel 175 as a light guiding member, a third condenser lens 178, a fourth condenser lens 179, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 emits image light emitted from the display element 50 arranged on the rear panel 13 side of the condenser lens 195 toward the projection optical system 220, and is therefore also a part of the projection optical system 220.

[0040] Light tunnel 175, third condenser lens 178, fourth condenser lens 179, and illumination mirror 185 are arranged in this order on the optical axis on the left panel 15 side of rotary wheel device 100. A bundle of light rays emitted from the exit port of light tunnel 175 is condensed by third condenser lens 178 and fourth condenser lens 179, and then irradiated by illumination mirror 185 through condenser lens 195 onto display element 50 at a predetermined angle.

[0041] In this embodiment, an example is shown in which light tunnel 175 is arranged as part of light source optical system 170, but a light guiding rod may be arranged instead of light tunnel 175. Using a light guiding rod instead of light tunnel 175 allows light to be guided more efficiently. As a modification of this embodiment, as shown in FIG. 5 , a microlens array 90 may be arranged instead of light tunnel 175, and a concave lens 181 may be arranged instead of third condenser lens 178. Using microlens array 90 allows for more space savings than using light tunnel 175 or the like.

[0042] The projection optical system 220 is composed of a condenser lens 195, a movable lens group 235, and a fixed lens group 225. The fixed lens group 225, which is arranged on the optical axis of the condenser lens 195 on the front panel 12 side, is housed in a fixed lens barrel and can be moved manually or automatically to enable zoom adjustment and focus adjustment.

[0043] Next, the incidence and emission of light from the rotary wheel device 100 will be described. First, based on FIG. 6, a case where blue wavelength band light, which is excitation light, is emitted from the rotary wheel device 100 will be described. Here, the position on the rotary wheel 101 where the excitation light (light L1 shown by a solid line in FIG. 6) is incident is defined as an irradiation spot S1 (see also FIG. 3(a)). In FIG. 6, the transparent bending region 106 of the rotary wheel 101 is located at the irradiation spot S1.

[0044] The excitation light emitted from the excitation light irradiation device 70 is incident obliquely on the front plate surface of the rotating wheel 101. When the transparent bending region 106 is positioned at the irradiation spot S1, the excitation light that is incident obliquely on the rotating wheel 101 is incident on the transparent bending region 106 of the rotating wheel 101. The excitation light that is incident on the transparent bending region 106 is bent by the transparent bending region 106 towards the light tunnel 175 and passes through the transparent bending region 106, and is further diffused by the transparent diffusion region 107 and passes through the transparent diffusion region 107, and is emitted towards the light tunnel 175. In this way, the excitation light that is blue wavelength band light can be used as light source light.

[0045] Next, a case where fluorescence of light in the green wavelength band is emitted from the rotary wheel device 100 and a case where fluorescence of light in the red wavelength band is emitted from the rotary wheel device 100 will be described with reference to Fig. 7. In Fig. 7, the first filter region 104a or the second filter region 104b in the filter region 104 of the rotary wheel 101 is located at the irradiation spot S1.

[0046] The excitation light emitted from the excitation light irradiating device 70 and incident obliquely on the plate surface (surface) of the rotating wheel 101 is incident on the first filter region 104a or the second filter region 104b in the filter region 104 of the rotating wheel 101. The excitation light incident on the filter region 104 is reflected by the filter region 104 toward the light-guiding optical system 140.

[0047] The excitation light (light L2 indicated by a solid line in FIG. 7) reflected toward the light-guiding optical system 140 enters the second condenser lens 142, is refracted by the second condenser lens 142, and then by the first condenser lens 141, and irradiates the fluorescence-emitting region 202 of the fixed phosphor 200. In the light source device 60, the rotating wheel 101 is disposed at an angle inclined with respect to a plane including the fluorescence-emitting region 202 of the fixed phosphor 200, so that the excitation light reflected by the filter region 104 can be condensed by the first condenser lens 141 and the second condenser lens 142. When the excitation light irradiates the phosphor particles in the fluorescence-emitting region 202, fluorescence in a yellow wavelength band (light L3 indicated by a dashed line in FIG. 7) is emitted in all directions. Here, the light emitted from the fluorescence-emitting region 202 contains fluorescence in the yellow wavelength band and excitation light that is reflected by the substrate 201 without being irradiated by the phosphor particles (hereinafter referred to as "residual excitation light"). Of the fluorescence and residual excitation light emitted from the phosphor region 202, the fluorescence and residual excitation light emitted toward the light source optical system 140 is focused by the first focusing lens 141 and the second focusing lens 142 and enters the rotating wheel 101.

[0048] When the first filter region 104a is located at the irradiation spot S1 of the rotating wheel 101, the first filter region 104a reflects and removes fluorescence in the red wavelength band from the fluorescence in the yellow wavelength band, and the fluorescence in the green wavelength band passes through the first filter region 104a. A portion of the residual excitation light incident on the first filter region 104a is reflected and removed by the first filter region 104a. The residual excitation light that was not completely removed by the first filter region 104a and passed through is reflected and removed by the excitation light reflecting region 104c. Similarly, when the second filter region 104b is located at the irradiation spot S1, the second filter region 104b reflects and removes fluorescence in the green wavelength band from the fluorescence in the yellow wavelength band, and the fluorescence in the red wavelength band passes through the second filter region 104b. A portion of the residual excitation light that enters the second filter region 104b is reflected and removed by the second filter region 104b. The residual excitation light that is not completely removed by the second filter region 104b and that passes through is reflected and removed by the excitation light reflecting region 104c. By passing the light through the excitation light reflecting region 104c in this manner, red wavelength band light and green wavelength band light (light L4 indicated by the dashed dotted line in FIG. 7) from which the residual excitation light has been substantially removed can be obtained. In one embodiment, the filter region 104 does not need to have the excitation light reflecting region 105. For example, if the residual excitation light is removed to an acceptable level by the first filter region 104a and the second filter region 104b, the filter region 104 does not need to have the excitation light reflecting region 105.

[0049] The red wavelength band light and green wavelength band light transmitted through filter region 104 are emitted toward light tunnel 175. At this time, the optical paths of the red wavelength band light and green wavelength band light traveling from rotating wheel device 100 to light tunnel 175 are the same as the optical path of the excitation light traveling from rotating wheel device 100 to light tunnel 175. In other words, rotating wheel device 100 is disposed at a position and angle such that the optical axis of the excitation light traveling through transparent bending region 106 and the optical axis of the red wavelength band light and green wavelength band light traveling through filter region 104 overlap.

[0050] As described above, in the light source device 60, the optical path of the blue wavelength band light (excitation light) and the optical paths of the red wavelength band light and the green wavelength band light different from the excitation light are the same optical path. This allows for a reduction in the number of components compared to conventional light source devices in which the optical paths of the excitation light and the optical paths of the wavelength band light different from the excitation light are separate, thereby enabling a more compact and efficient device. Furthermore, the light source device 60 can reduce the occurrence of color unevenness due to errors caused by the optical paths of the excitation light and the wavelength band light different from the excitation light being separate optical paths. Furthermore, because the rotating wheel 101 has the transmissive bending region 106 that bends and transmits the excitation light, no components for bending the excitation light are required, allowing for a more compact device.

[0051] Furthermore, in light source device 60, when blue wavelength band light, which is excitation light, is emitted toward light source optical system 170, the blue wavelength band light can be guided toward light source optical system 170 without passing through fixed phosphor 200 by bending the blue wavelength band light at transparent bending region 106a of rotating wheel device 100. Therefore, the optical path of the blue wavelength band light and the optical path of the fluorescence emitted from fixed phosphor 200 do not overlap between rotating wheel device 100 and fixed phosphor 200, and there is no need to provide a separate configuration for emitting blue wavelength band light by splitting using a color wheel or the like, thereby making it possible to reduce the size of the device.

[0052] Furthermore, in the light source device 60, the excitation light irradiation device 70 and the fixed phosphor 200 are arranged on the front surface side of the rotating wheel 101, i.e., on the side opposite to the side on which the motor 110 is arranged. This makes the excitation light irradiation device 70 and the fixed phosphor 200 less susceptible to the effects of heat generated by the motor 110 and allows the excitation light irradiation device 70 and the fixed phosphor 200 to dissipate heat efficiently, thereby enabling the cooling fan provided in the light source device 60 to be made smaller, and the device to be made more compact.

[0053] The projection device 10 also includes a display element 50 that is irradiated with light source light from a light source device 60 and generates image light, a projection optical system 220 that projects the image light emitted from the display element 50 onto a projection target such as a screen, and a control unit that controls the light source device 60 and the display element 50. This makes it possible to provide a projection device 10 that can be made smaller and more efficient, and that can reduce the occurrence of color unevenness.

[0054] (Second embodiment) Next, a second embodiment of the present invention will be described with reference to Figures 8 and 9. In the description of the second embodiment, the description of the same configuration as in the first embodiment will be omitted or simplified. In the light source device according to the second embodiment, the rotating wheel device 300 is arranged at an angle such that the rotating wheel 301 of the rotating wheel device 300 is parallel to the surface of the base material 201 of the fixed phosphor 200 facing the rotating wheel device 300 (the surface including the fluorescent light emitting region 202).

[0055] The filter region 304 in the rotating wheel 301 includes a first filter region and a second filter region on the opposite side of the rotating wheel 301 from the excitation light irradiating device 70. The first filter region and the second filter region are circumferentially arranged on the surface opposite to the excitation light irradiating device 70 side alongside a region (transmission diffusion region 107) on the opposite surface that corresponds to the transmission bending region 106.

[0056] The rotating wheel 301 includes a reflective bending region 305 on the opposite surface of the rotating wheel 301 facing the excitation light irradiation device 70, corresponding to the first filter region and the second filter region. The reflective bending region 305 reflects blue wavelength band light, which is excitation light incident obliquely onto the surface of the rotating wheel 301, in the normal direction to the surface of the rotating wheel 301. The reflective bending region 305 is coated with a dichroic coating or the like to reflect blue wavelength band light and transmit light in wavelength bands other than the blue wavelength band. In this embodiment, as shown in FIG. 9( a), the reflective bending region 305 is formed with a reflective diffraction grating 305a that diffracts blue wavelength band light while reflecting it in the normal direction to the surface of the rotating wheel 301. Due to the reflective diffraction grating 305a, the blue wavelength band light incident on the reflective bending region 305 is reflected along the optical path indicated by the arrow in FIG. 9( a). The reflective bending region 305 may be provided with a diffusive property for diffusing light in the blue wavelength band, if necessary.

[0057] While this embodiment shows an example in which the reflective diffraction grating 305a is formed in the reflective-flexible region 305, as shown in Fig. 9(b), a plurality of minute reflective-refractive members 305b (refractive members) having inclined surfaces that reflect blue wavelength band light at a predetermined angle may be formed in the reflective-flexible region 305. Furthermore, as shown in Fig. 9(c), a single reflective-refractive member 305c having an inclined surface that reflects blue wavelength band light at a predetermined angle may be formed in the reflective-flexible region 305. In this case, the predetermined angle is an angle that reflects blue wavelength band light toward the light-guiding optical system 140, and the blue wavelength band light incident on the reflective-flexible region 305 is reflected along an optical path indicated by the arrows in Figs. 9(b) and 9(c).

[0058] Next, referring to Fig. 8, the incidence and emission of light when fluorescence of light in the green wavelength band is emitted from the rotary wheel device 300 and when fluorescence of light in the red wavelength band is emitted from the rotary wheel device 300 in the light source device of the second embodiment will be described. The excitation light emitted from the excitation light irradiating device 70 and incident obliquely on the plate surface of the rotary wheel 301 is incident on the reflective bending region 305 of the rotary wheel 301. The excitation light incident on the reflective bending region 305 is reflected by the reflective bending region 305 in the normal direction to the plate surface of the rotary wheel 301 and heads toward the light-guiding optical system 140.

[0059] The excitation light (light L5 shown by a solid line in FIG. 8) reflected toward the light-guiding optical system 140 is incident on the second collecting lens 142 and the first collecting lens 141 in this order, with its optical axis aligned with the optical axis directions of the first collecting lens 141 and the second collecting lens 142, and irradiates the fluorescence-emitting region 202 of the fixed phosphor 200. At this time, the excitation light irradiates the fluorescence-emitting region 202 in a manner perpendicular to the plate surface of the base material 201 of the fixed phosphor 200. Fluorescence in the yellow wavelength band (light L6 shown by a dashed line in FIG. 8) emitted from the fluorescence-emitting region 202 as a result of the excitation light irradiating the fluorescence-emitting region 202 and the residual excitation light are condensed by the first collecting lens 141 and the second collecting lens 142 and enter the reflective-bending region 305 of the rotating wheel 301. In this embodiment, even when the rotating wheel 301 is positioned at an angle parallel to the plane including the fluorescent light-emitting region 202 of the fluorescent light-emitting device 200, the excitation light reflected by the reflective bending region 305 of the rotating wheel 301 can be irradiated onto the fluorescent light-emitting region 202, making it easier to design the light source device 60 than when the rotating wheel 301 is inclined with respect to the fluorescent light-emitting region 202.

[0060] The fluorescence incident on reflective bending region 305 of rotating wheel 301 passes through reflective bending region 305 and enters the first filter region or the second filter region of filter region 304, where it is separated into red wavelength band light or green wavelength band light, and is emitted toward light tunnel 175. At this time, the optical paths of the red wavelength band light and green wavelength band light traveling from rotating wheel device 300 toward light tunnel 175 are the same as the optical path of the excitation light traveling from rotating wheel device 300 toward light tunnel 175. In other words, rotating wheel device 300 is disposed at a position and angle such that the optical axis of the excitation light transmitted through transparent bending region 106 and the optical axis of the red wavelength band light and green wavelength band light transmitted through filter region 304 overlap. Specifically, the excitation light irradiation device 70, the rotating wheel device 300, and the fixed phosphor 200 (fluorescence light emitting device) are arranged at a position and angle such that the optical axis of the excitation light transmitted through the transparent bending region 106 overlaps with the optical axes of the red wavelength band light and the green wavelength band light transmitted through the filter region 304.

[0061] In this way, in the light source device according to the second embodiment, the optical path of the blue wavelength band light, which is the excitation light, and the optical paths of the red wavelength band light and the green wavelength band light, which are different from the excitation light, are the same, so that the number of components can be reduced compared to conventional light source devices in which the optical path of the excitation light and the optical paths of the wavelength band light, which are different from the excitation light, are separate. This allows for a smaller device, higher efficiency, and reduced color unevenness.

[0062] (Third embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. 10 and 11 . Note that in the description of the third embodiment, the description of the same configuration as in the first embodiment will be omitted or simplified. The light source device according to 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 a disk shape and a fluorescent light-emitting region 402 formed on the fluorescent wheel 401. The fluorescent wheel 401 is supported at its center by a motor shaft of a motor, and when the motor is driven, the fluorescent wheel 401 is driven to rotate around the motor shaft. Of both plate surfaces of the fluorescent wheel 401, a flat reflective portion that is mirror-finished by silver vapor deposition or the like is formed on the side facing the light-guiding optical system 140. The fluorescent light-emitting region 402 is arranged in an annular shape on the reflective portion on the surface of the fluorescent wheel 401.

[0063] 11, the rotating wheel 501 in the rotating wheel device 500 includes a filter region 504 and a transmission bending region 506 on one of both plate surfaces of the rotating wheel 501 that faces the excitation light irradiation device 70. The filter region 504 further 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, and in the example shown in FIG. 11, are each arranged within an angular range of approximately 90 degrees.

[0064] The first filter region 504a, the second filter region 504b, and the third filter region 504c are all processed as dichroic mirrors. The first filter region 504a transmits green wavelength band light and reflects blue and red wavelength band light. The second filter region 504b transmits red wavelength band light and reflects blue and green wavelength band light. The third filter region 504c transmits yellow wavelength band light and reflects blue, green, and red wavelength band light.

[0065] As shown in FIG. 10 , the filter region 504 of the rotating wheel 501 includes an excitation light reflection region 505 in a region on the opposite side corresponding to the first filter region 504a, the second filter region 504b, and the third filter region 504c. The rotating wheel 501 also includes a transmission diffusion region 507 in a region on the opposite side corresponding to the transmission bending region 506. In the light source device according to this embodiment, the fluorescence emitted from the fluorescence-emitting region 402 is transmitted through the third filter region 504c of the filter region 504 in accordance with the color design, thereby guiding yellow wavelength band light toward the light source optical system. In one embodiment, the rotating wheel 501 may not include the transmission diffusion region 507 or the excitation light reflection region 505.

[0066] As shown in FIG. 10, in the light source device according to the third embodiment, the optical path of blue wavelength band light, which is excitation light, and the optical paths of red wavelength band light, green wavelength band light, and yellow wavelength band light, which are different from the excitation light, are the same (in FIG. 10, the excitation light (blue wavelength band light) reflected toward the light-guiding optical system 140 and the excitation light that has passed through the rotary wheel device 500 are shown by solid lines, and the yellow wavelength band fluorescence emitted from the fluorescent light-emitting region 402 of the fluorescent wheel device 400, and the red wavelength band light, green wavelength band light, and yellow wavelength band light that have passed through the rotary wheel device 500 are shown by dashed dotted lines). Therefore, the same effects (reduced size of the device, high efficiency, reduced color unevenness) as those of the light source device 60 according to the first embodiment and the light source device according to the second embodiment can be obtained.

[0067] Furthermore, by using the fluorescent wheel device 400 as the fluorescent light-emitting device, the color of the fluorescent light emitted from the fluorescent light-emitting region 402 can be changed to a color other than the yellow wavelength band light as needed. Furthermore, by using the fluorescent wheel device 400, it is possible to prevent heat caused by irradiation with excitation light from concentrating in a part of the fluorescent light-emitting region 402.

[0068] In one embodiment, a fluorescent wheel device 400 may be used as the fluorescent light-emitting device instead of the fixed fluorescent member 200 in the first and second embodiments described above. Furthermore, in one embodiment, the configuration of the rotating wheel 501 described with reference to Figs. 10 and 11 may be applied to the first and second embodiments described above. Specifically, the filter region 104 (or the filter region 304) may have a third filter region similar to the third filter region 504c that transmits yellow wavelength band light and reflects blue wavelength band light, green wavelength band light, and red wavelength band light on the same surface as the first filter region 104a (or the first filter region of the filter region 304) and the second filter region 104b (or the second filter region of the filter region 304). In this case, the first filter region 104a (or the first filter region of the filter region 304), the second filter region 104b (or the second filter region of the 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 wheel 101, 301.

[0069] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described with reference to Figures 12 to 16. In the description of the fourth embodiment, the description of the same configuration as in the first embodiment will be omitted or simplified. As shown in Figure 12, the projection device 10 according to the fourth embodiment includes a light source device 560 disposed substantially in the center 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 a control circuit board 242.

[0070] The light source device 560 includes an excitation light irradiating device 70 that is a light source of blue wavelength band light (first wavelength band light) and also a light source of excitation light, a red / green light source device 80 that is a light source of red wavelength band light (third wavelength band light) and green wavelength band light (fourth wavelength band light), a rotating wheel device 600, and a fixed phosphor 200 (fluorescence light-emitting device). The excitation light irradiating device 70 is disposed facing a plate surface of a rotating wheel 601 of the rotating wheel device 600, and the fixed phosphor 200 (fluorescence light-emitting device) is disposed facing a plate surface of the rotating wheel 601 on the opposite side from the excitation light irradiating device 70. The configuration and operation of the excitation light irradiating device 70 are similar to those of the first embodiment. The red / green light source device 80 is configured by the excitation light irradiating device 70, the rotating wheel device 600, and the fixed phosphor 200. In addition, the light source device 560 is provided with a light-guiding optical system 140 that guides the excitation light that has passed through the rotating wheel device 600 to the fixed phosphor 200 side and guides the fluorescence emitted from the fluorescent light-emitting region 202 of the fixed phosphor 200 to the rotating wheel device 600 side, and a light source optical system 170 that guides the light that has passed through the rotating wheel device 600.

[0071] Next, a description will be given of a configuration 601 of a rotating wheel included in the rotating wheel device 600. The rotating wheel 601 is a color wheel made of a transparent material such as glass or resin, and includes a filter region 604 and a transmissive bending region 606. The configuration for driving the rotating wheel 601 to rotate is the same as that of the first embodiment (see FIG. 13(b)). The filter region 604 includes a first filter region 604a and a second filter region 604b on the opposite side (front side) of both surfaces of the rotating wheel 601 from the excitation light irradiation device 70. The transmissive bending region 606 is provided in a region different from the filter region 604 on the opposite side (front side) of both surfaces of the rotating wheel 601 from the excitation light irradiation device 70. The first filter region 604a, the second filter region 604b, and the transmissive bending region 606 are arranged side by side in the circumferential direction of the rotating wheel 601, and are arranged at an angular range of approximately 120 degrees, respectively, in the example shown in FIG. 13(a). The proportions of the first filter region 604a, the second filter region 604b, and the transmissive bending region 606 are not limited to an angular range of approximately 120 degrees, but may be changed as appropriate.

[0072] The first filter region 604a and the second filter region 604b in the filter region 604 are dichroic mirror processed to reflect light in a part of the wavelength band of the fluorescence emitted from the fluorescence-emitting region 202 (described later) and transmit light in a predetermined wavelength band consisting of excitation light and light in another part of the wavelength band of the fluorescence. Specifically, the first filter region 604a reflects green wavelength band light (fourth wavelength band light) and transmits blue wavelength band light (first wavelength band light) and red wavelength band light (third wavelength band light), which are wavelength bands of the excitation light. The second filter region 604b reflects red wavelength band light and transmits blue wavelength band light and green wavelength band light.

[0073] The transparent bending region 606 bends and transmits blue wavelength band light, which is the wavelength band of the excitation light. The blue wavelength band light incident on the transparent bending region 606 is refracted so as to be guided toward the light tunnel 175, which will be described later. Specifically, the blue wavelength band light incident on the transparent bending region 606 is bent at an angle such that its optical axis coincides with the light guide direction of the light guide optical system 170, which will be described later. In this embodiment, as shown in FIG. 14( a), a transmission diffraction grating 606a (diffraction grating) that diffracts blue wavelength band light is formed in the transparent bending region 606. The transmission diffraction grating 606a constituting the over-bending region 606a can be easily formed by providing grooves on the plate surface of the rotating wheel 601. Due to the formation of the transmission diffraction grating 606a, the blue wavelength band light incident on the transparent bending region 606 is guided along the optical path indicated by the arrow in FIG. 14( a). The transparent bending region 606 may be provided with diffusive properties to diffuse the blue wavelength band light, if necessary.

[0074] In this embodiment, the transparent bending region 606 is provided on the front surface of the rotating wheel 601, and a transmission diffraction grating 606a is formed in the transparent bending region 606. However, as shown in FIG. 14(b), the transparent bending region 606 may be provided in a region of the rear surface of the rotating wheel 601 that does not correspond to the filter region 604, and a transparent diffusion region 607 that transmits and diffuses blue wavelength band light that has passed through the transparent bending region 606 may be provided in a region of the front surface of the rotating wheel 601 that corresponds to the transparent bending region 606. In this case, the blue wavelength band light that enters the transparent bending region 606 is guided along the optical path indicated by the arrows in FIG. 14(b). In one embodiment, the configuration shown in FIGS. 4(b) and 4(c) may be applied to the transparent bending region 606. That is, the transparent bending region 606 may be formed with multiple minute transparent refractive members that have inclined surfaces that refract blue wavelength band light and are arranged concentrically, or may be formed with a single transparent refractive member that has an inclined surface that refracts blue wavelength band light. 14(b), the transmissive diffusion area 607 may not be provided. For example, if the image quality of the image projected onto the projection target is good even if the blue wavelength band light is not diffused by the rotating wheel 601, the transmissive diffusion area 607 may not be provided.

[0075] The rotating wheel device 600 is arranged so that the optical axis of the blue wavelength band light that has been bent by the transparent bending region 606 and transmitted through the transparent 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 a function of combining the blue wavelength band light that has been transmitted through the transparent bending region 606 with the green wavelength band light and red wavelength band light that have been reflected by the filter region 604 onto the same optical axis. Specifically, the excitation light irradiation device 70, the rotating wheel device 600, and the fixed phosphor 200 (fluorescence light-emitting device) are arranged so that the optical axis of the blue wavelength band light that has been transmitted through the transparent bending region 606 overlaps with the optical axis of the fluorescence reflected by the filter region 604.

[0076] The yellow wavelength band fluorescence emitted from the phosphor region 202 and incident on the filter region 604 of the rotating wheel device 600 is split into light of a predetermined wavelength band different from the wavelength band of the excitation light by the filter region 604. Specifically, the yellow wavelength band fluorescence includes red wavelength band light and green wavelength band light, and the red wavelength band light is transmitted and removed by the first filter region 604a, the green wavelength band light is split and reflected by the rotating wheel 601, and the green wavelength band light is transmitted and removed by the second filter region 604b, the red wavelength band light is split and reflected by the rotating wheel 601.

[0077] Next, the incidence and emission of light from the rotary wheel device 600 will be described. First, based on Fig. 15, a case where blue wavelength band light, which is excitation light, is emitted from the rotary wheel device 600 will be described. Here, the position on the rotary wheel 601 where the excitation light (light L7 shown by the solid line in Fig. 15) is incident is defined as an irradiation spot S2 (see also Fig. 13(a)). In Fig. 15, the transmissive bending region 606 of the rotary wheel 601 is located at the irradiation spot S2.

[0078] The excitation light emitted from the excitation light irradiation device 70 is obliquely incident on the back surface of the rotating wheel 601. When the transparent bending region 606 is positioned at the irradiation spot S2, the excitation light obliquely incident on the rotating wheel 601 enters the transparent bending region 606 of the rotating wheel 601. The excitation light incident on the transparent bending region 606 is bent by the transparent bending region 606 toward the light tunnel 175, passes through the transparent bending region 606, and is emitted toward the light tunnel 175. In this way, the excitation light in the blue wavelength band can be used as light source light. Note that if the transparent diffusion region 607 is provided in a region of the surface of the rotating wheel 601 corresponding to the transparent bending region 606, the excitation light obliquely incident on the rotating wheel 601 is bent by the transparent bending region 606, diffused by the transparent diffusion region 607, and emitted toward the light tunnel 175.

[0079] 16, a case where fluorescence of green wavelength band light is emitted from the rotary wheel device 600 and a case where fluorescence of red wavelength band light is emitted from the rotary wheel device 600 will be described. In Fig. 16, the first filter region 604a or the second filter region 604b in the filter region 604 of the rotary wheel 601 is located at the irradiation spot S2.

[0080] The excitation light emitted from the excitation light irradiating device 70 and incident obliquely on the plate surface (rear surface) of the rotating wheel 601 is incident on the first filter region 604a or the second filter region 604b in the filter region 604 of the rotating wheel 601. The excitation light incident on the filter region 604 passes through the filter region 604 without being bent, and is emitted to the light-guiding optical system 140 side.

[0081] The excitation light (light L8 indicated by a solid line in FIG. 16) emitted toward the light-guiding optical system 140 enters the second condenser lens 142 from the front, passes through the second condenser lens 142 and the first condenser lens 141 in that order, and irradiates the fluorescence-emitting region 202 of the fixed phosphor 200. In the light source device 560, the excitation light emitting device 70 is disposed opposite the surface including the fluorescence-emitting region 202 of the fixed phosphor 200 with the rotating wheel 601 interposed therebetween, so that the excitation light transmitted through the filter region 604 can be made to enter the first condenser lens 141 and the second condenser lens 142 from the front. When the excitation light irradiates the phosphor particles in the fluorescence-emitting region 202, fluorescence in the yellow wavelength band (light L9 indicated by a dashed line in FIG. 16) is emitted in all directions. The light emitted from the fluorescence-emitting region 202 contains fluorescence in the yellow wavelength band and residual excitation light that is not irradiated by the phosphor particles but is reflected by the substrate 201. Of the fluorescence and residual excitation light emitted from the phosphor region 202, the fluorescence and residual excitation light that are emitted toward the light source optical system 140 are condensed by the first condenser lens 141 and the second condenser lens 142 and are incident on the rotating wheel 601 from its surface.

[0082] When the first filter region 604a is located at the irradiation spot S2 of the rotating wheel 601, the first filter region 604a transmits and removes fluorescence in the red wavelength band from the fluorescence in the yellow wavelength band, and the first filter region 604a reflects fluorescence in the green wavelength band. Furthermore, 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 irradiation spot S2, the second filter region 604b transmits and removes fluorescence in the green wavelength band from the fluorescence in the yellow wavelength band, and the second filter region 604b reflects fluorescence in the red wavelength band. Residual excitation light incident on the second filter region 604b is removed by passing through the second filter region 604b. In this way, it is possible to obtain red wavelength band light and green wavelength band light (light L10 indicated by the dashed dotted line in FIG. 16) from which the residual excitation light has been almost completely removed.

[0083] The red wavelength band light and green wavelength band light reflected by filter region 604 are emitted toward light tunnel 175. In light source device 560, rotating wheel 601 is disposed at an inclined angle with respect to a plane including fluorescent light-emitting region 202 of fixed phosphor 200, so that red wavelength band light and green wavelength band light reflected by filter region 604 can be guided to light tunnel 175. In this case, the optical path of red wavelength band light and green wavelength band light traveling from rotating wheel device 600 to light tunnel 175 is the same as the optical path of excitation light traveling from rotating wheel device 600 to light tunnel 175. In other words, rotating wheel device 600 is disposed at a position and angle such that the optical axis of the excitation light transmitted through transparent bending region 606 and the optical axis of the red wavelength band light and green wavelength band light reflected by filter region 604 overlap.

[0084] As described above, in the light source device 560, the optical path of the blue wavelength band light (excitation light) and the optical paths of the red wavelength band light and the green wavelength band light different from the excitation light are the same optical path. This allows for a reduction in the number of components compared to conventional light source devices in which the optical paths of the excitation light and the optical paths of the wavelength band light different from the excitation light are separate, thereby enabling a more compact and efficient device. Furthermore, the light source device 560 can reduce the occurrence of color unevenness due to errors caused by the optical paths of the excitation light and the wavelength band light different from the excitation light being separate optical paths. Furthermore, because the rotating wheel 601 has the transmissive bending region 606 that bends and transmits the excitation light, no components for bending the excitation light are required, allowing for a more compact device.

[0085] Furthermore, in the light source device 560, the excitation light irradiating device 70 is disposed on the opposite side of the plate surface of the rotating wheel 601 from the side on which the fixed phosphor 200 is disposed. This makes it easier to cause the excitation light emitted from the excitation light irradiating device 70 to enter the light-guiding optical system 140, thereby increasing the degree of freedom in the placement of the excitation light irradiating device 70 and facilitating optical axis adjustment.

[0086] (Fifth embodiment) Next, a fifth embodiment of the present invention will be described with reference to Fig. 17. Note that in the description of the fifth embodiment, the description of the same configuration as the fourth embodiment will be omitted or simplified. A light source device 660 according to the fifth embodiment differs from the fourth embodiment in the arrangement of the excitation light irradiation device 70, the fixed phosphor 200, and the light-guiding optical system 140, and the arrangement and configuration of the rotary wheel device 700. As shown in Fig. 7, in the light source device 660, the excitation light irradiation device 70 is disposed opposite the light tunnel 175 so that the light tunnel 175 is positioned on the optical axis of the excitation light emitted from the excitation light irradiation device 70.

[0087] The rotating wheel 701 in the rotating wheel device 700 is disposed at an inclined angle with respect to a surface including the fluorescence-emitting region 202 of the fixed phosphor 200 so that light emitted from the excitation light irradiating device 70 is incident obliquely on the plate surface (rear surface) of the rotating wheel 701. The rotating wheel 701 includes a filter region 704 and a transmissive bending region 706 in the same region on its plate surface. That is, the rotating wheel 701 includes the filter region 704 on the side of its both plate surfaces opposite the excitation light irradiating device 70 (front surface side), and includes the transmissive bending region 706 in a region on the rear surface corresponding to the filter region 704. The filter region 704 also includes a first filter region and a second filter region arranged side by side in the circumferential direction of the rotating wheel 701. The functions of the filter region 704, the transmissive bending region 706, the first filter region, and the second filter region are the same as those in the fourth embodiment.

[0088] Furthermore, an excitation light transmission region 707 is provided on the opposite surface of the rotating wheel 701, on the excitation light irradiation device 70 side (rear side), in a region different from the filter region 704 and the transmission bending region 706. The excitation light transmission region 707 transmits light in the blue wavelength band. This excitation light transmission region 707 may be provided with diffusibility to diffuse light in the blue wavelength band, as necessary. In one embodiment, the excitation light transmission region 707 is formed of a transparent material such as glass or resin that has transparency. Furthermore, in another embodiment, the excitation light transmission region 707 may be provided on the front side of the rotating wheel 701, or on both sides of the rotating wheel 701.

[0089] In one embodiment, as described in the first embodiment, a transmission diffraction grating that diffracts blue wavelength band light may be formed in the transmission bending region 706. Alternatively, a plurality of minute transmission refractive members that have inclined surfaces that refract blue wavelength band light and are arranged concentrically may be formed in the transmission bending region 706. Alternatively, a single transmission refractive member that has an inclined surface that refracts blue wavelength band light may be formed in the transmission bending region 706.

[0090] The rotating wheel device 700 is disposed so that the optical axis of the blue wavelength band light transmitted through the excitation light transmitting 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 a function of combining the blue wavelength band light transmitted through the excitation light transmitting region 707 with the green wavelength band light and the red wavelength band light reflected by the filter region 704 onto the same optical axis.

[0091] Next, the light emission and incidence of the rotary wheel device 700 in the fifth embodiment will be described. First, a case will be described in which blue wavelength band light, which is excitation light, is emitted from the rotary wheel device 700. In this case, the excitation light transmission region 707 of the rotary wheel 701 is located at the irradiation spot on the rotary wheel 701 where the excitation light is incident. The excitation light emitted from the excitation light emitting device 70 is incident obliquely on the plate surface (rear surface) of the rotary wheel 701. When the excitation light transmission region 707 is located at the irradiation spot, the excitation light that is obliquely incident on the rotary wheel 701 is incident on the excitation light transmission region 707 of the rotary wheel 701. The excitation light that has entered the excitation light transmission region 707 passes through the excitation light transmission region 707 without being bent and is emitted toward the light tunnel 175. In this way, the excitation light that is blue wavelength band light can be used as light source light.

[0092] Next, a case where fluorescence of light in the green wavelength band is emitted from the rotary wheel device 700 and a case where fluorescence of light in the red wavelength band is emitted from the rotary wheel device 700 will be described. In this case, the filter region 704 is located on the front side of the irradiation spot on the rotary wheel 701, and the transparent bending region 706 is located on the back side. The excitation light emitted from the excitation light irradiating device 70 and incident obliquely on the plate surface (back side) of the rotary wheel 701 is incident on the transparent bending region 706 of the rotary wheel 701. The excitation light incident on the transparent bending region 706 is bent by the transparent bending region 706 toward the light-guiding optical system 140, passes through the transparent bending region 706 and the filter region 704, and is emitted toward the light-guiding optical system 140.

[0093] The excitation light (light L11 shown by a solid line in FIG. 17) emitted toward the light-guiding optical system 140 enters the second condenser lens 142 from the front, passes through the second condenser lens 142 and the first condenser lens 141 in that order, and illuminates the fluorescence-emitting region 202 of the fixed phosphor 200. When the excitation light illuminates the phosphor particles in the fluorescence-emitting region 202, fluorescence in the yellow wavelength band (light L12 shown by a dashed line in FIG. 17) is emitted in all directions. Of the fluorescence and residual excitation light emitted from the phosphor region 202, the fluorescence and residual excitation light that are emitted toward the light-source optical system 140 are collected by the first condenser lens 141 and the second condenser lens 142 and enter the rotating wheel 701 from its surface.

[0094] When the first filter region is located in the irradiation spot of rotating wheel 701, fluorescence in the green wavelength band is reflected by the first filter region, and when the second filter region is located, fluorescence in the red wavelength band is reflected by the second filter region. The red wavelength band light and green wavelength band light reflected by filter region 704 are emitted toward light tunnel 175. At this time, the optical paths of the red wavelength band light and green wavelength band light traveling from rotating wheel device 700 to light tunnel 175 are the same as the optical path of the excitation light traveling from rotating wheel device 700 to light tunnel 175.

[0095] As described above, in the light source device 660 according to this embodiment, the rotating wheel 701 includes a filter region 704, which is provided in a region on the surface opposite to the transmissive bending region 706 and which reflects fluorescence in the green wavelength band and fluorescence in the red wavelength band while transmitting excitation light, and an excitation light transmission region 707, which is provided in a region different from the transmissive bending region 706 and transmits excitation light. The rotating wheel device 700 is arranged so that the optical axis of the excitation light transmitted through the excitation light transmission region 707 overlaps with the optical axis of the fluorescence in the green wavelength band and fluorescence in the red wavelength band reflected by the filter region 704. Therefore, as with the fourth embodiment, the number of components can be reduced compared to conventional light source devices, resulting in a more compact and efficient device. Furthermore, the occurrence of color unevenness due to errors caused by the optical paths of the excitation light and light in wavelength bands different from the excitation light being separate optical paths can be reduced.

[0096] Furthermore, in the light source device 660 according to this embodiment, the excitation light emitted from the excitation light irradiation device 70 is bent by the transparent bending region 706 of the rotating wheel 701, so that the excitation light is irradiated onto the fluorescence emission region 202 of the fixed phosphor 200. This makes it easier to irradiate the fixed phosphor 200 with the excitation light.

[0097] (Sixth embodiment) Next, a sixth embodiment of the present invention will be described with reference to Figures 18 and 19. In the description of the sixth embodiment, the description of the same configuration as the fourth embodiment will be omitted or simplified. A light source device 760 according to the sixth embodiment differs from those of the fourth embodiment in the arrangement of the excitation light irradiation device 70, the fixed phosphor 200, and the light guide optical system 140, and the arrangement and configuration of the rotary wheel device 800. In the light source device 760 according to the sixth embodiment, the fixed phosphor 200 is arranged opposite the light tunnel 175 with the rotary wheel device 800 sandwiched between them.

[0098] The rotating wheel 801 in the rotating wheel device 800 is disposed at an inclined angle with respect to a plane including the fluorescence-emitting region 202 of the fixed phosphor 200 so that light emitted from the excitation light irradiation device 70 is incident obliquely on the plate surface (front surface) of the rotating wheel. As shown in FIG. 19( a), the rotating wheel 801 includes a filter region 804 and a transmissive bending region 806 in the same region on its plate surface. That is, the rotating wheel 801 includes the filter region 804 on the excitation light irradiation device 70 side (front surface side) of both plate surfaces, and the transmissive bending region 806 in the region on the back surface corresponding to the filter region 804. The filter region 804 also includes a first filter region and a second filter region arranged side by side in the circumferential direction of the rotating wheel 801. Blue wavelength band light incident on the filter region 804 from the surface of the rotating wheel 801 passes through the filter region 804 and is bent by the transmission bending region 806 before passing through the transmission bending region 806, as shown by the arrows in FIG. 19(a).

[0099] Here, the sixth embodiment differs from the fourth and fifth embodiments in the function of the transmissive bending region 806 and the functions of the first and second filter regions in the filter region 804. That is, the transmissive bending region 806 transmits green and red wavelength band light in addition to blue wavelength band light. Examples of the transmissive bending region 806 include a volume hologram and a diffraction grating having a laminated structure. Furthermore, the first filter region transmits green and blue wavelength band light and reflects red wavelength band light. The second filter region transmits red and blue wavelength band light and reflects green wavelength band light.

[0100] As shown in FIG. 19(b), an excitation light reflecting region 805 is provided on the surface of both sides of the rotating wheel 801, on the excitation light irradiating device 70 side (front side), in a region different from the filter region 804 and the transmission bending region 806. The excitation light reflecting region 805 reflects blue wavelength band light, which is excitation light. This excitation light reflecting region 805 may have diffusive properties to diffuse blue wavelength band light, as necessary. The blue wavelength band light incident on the excitation light reflecting region 805 from the surface of the rotating wheel 801 is reflected by the excitation light reflecting region 805, as indicated by the arrow in FIG. 19(b).

[0101] The rotating wheel device 800 is arranged so that the optical axis of the blue wavelength band light reflected by the excitation light reflecting region 805 overlaps with the optical axis of the fluorescence transmitted through the filter region 804 (first filter region or second filter region). That is, the rotating wheel device 800 has a function of combining the blue wavelength band light reflected by the excitation light reflecting region 805 with the green wavelength band light and red wavelength band light transmitted through the filter region 804 into the same optical axis. Specifically, the excitation light irradiation device 70, the rotating wheel device 800, and the fixed phosphor 200 (fluorescence light-emitting device) are arranged so that the optical axis of the blue wavelength band light reflected by the excitation light reflecting region 805 overlaps with the optical axis of the fluorescence transmitted through the filter region 804.

[0102] Next, the light emission and incidence of the rotary wheel device 800 in the sixth embodiment will be described with reference to FIG. 18 . First, a case where blue wavelength band light, which is excitation light, is emitted from the rotary wheel device 800 will be described. In this case, the excitation light reflection region 805 of the rotary wheel 801 is located at the irradiation spot on the rotary wheel 801 where the excitation light is incident. The excitation light emitted from the collimator lens 73 of the excitation light irradiation device 70 is incident obliquely on the surface of the rotary wheel 801. When the excitation light reflection region 805 is located at the irradiation spot, the excitation light incident obliquely on the rotary wheel 801 is incident on the excitation light reflection region 805 of the rotary wheel 801. The excitation light incident on the excitation light reflection region 805 is reflected by the excitation light reflection region 805 toward the light tunnel 175. In this way, the excitation light in the blue wavelength band can be used as light source light.

[0103] Next, a case where fluorescence of light in the green wavelength band is emitted from the rotary wheel device 800 and a case where fluorescence of light in the red wavelength band is emitted from the rotary wheel device 800 will be described. In this case, the filter region 804 is located on the front side of the irradiation spot on the rotary wheel 801, and the transmission bending region 806 is located on the back side. The excitation light emitted from the excitation light irradiating device 70 and incident obliquely on the plate surface (front surface) of the rotary wheel 801 is incident on the filter region 804 of the rotary wheel 801. The excitation light incident on the filter region 804 passes through the filter region 804 and is bent by the transmission bending region 806 toward the light-guiding optical system 140, passes through the transmission bending region 806, and is emitted toward the light-guiding optical system 140.

[0104] The excitation light (light L13 shown by a solid line in FIG. 18) emitted toward the light-guiding optical system 140 enters the second condenser lens 142 from the front, passes through the second condenser lens 142 and the first condenser lens 141 in that order, and illuminates the fluorescence-emitting region 202 of the fixed phosphor 200. When the excitation light illuminates the phosphor particles in the fluorescence-emitting region 202, fluorescence in the yellow wavelength band (light L14 shown by a dashed line in FIG. 18) is emitted in all directions. Of the fluorescence and residual excitation light emitted from the phosphor region 202, the fluorescence and residual excitation light that are emitted toward the light-source optical system 140 are collected by the first condenser lens 141 and the second condenser lens 142 and enter the rotating wheel 801 from its back surface.

[0105] Fluorescence and residual excitation light incident on the back surface of rotating wheel 801 pass through transmission bending region 806 and enter the first filter region or the second filter region. When the first filter region is located in the irradiation spot of rotating wheel 801, fluorescence in the green wavelength band passes through the first filter region, and when the second filter region is located, fluorescence in the red wavelength band passes through the second filter region. The red and green wavelength band light that passed through filter region 804 is emitted toward light tunnel 175. At this time, the optical paths of the red and green wavelength band light traveling from rotating wheel device 800 to light tunnel 175 are the same as the optical path of the excitation light traveling from rotating wheel device 800 to light tunnel 175.

[0106] As described above, in the light source device 760 according to this embodiment, the transmissive bending region 806 transmits fluorescence in the green wavelength band and fluorescence in the red wavelength band. The rotating wheel 801 includes a filter region 804, which is provided in a region on the surface opposite to the transmissive bending region 806 and transmits fluorescence in the green wavelength band or fluorescence in the red wavelength band and also transmits excitation light, and an excitation light reflection region 805, which is provided in a region different from the transmissive bending region 806 and reflects the excitation light. The rotating wheel device 800 is arranged so that the optical axis of the excitation light reflected by the excitation light reflection region 805 overlaps with the optical axis of the fluorescence in a predetermined wavelength band that has passed through the filter region 804. Therefore, as with the fourth embodiment, the number of components can be reduced compared to conventional light source devices, resulting in a more compact and efficient device. Furthermore, the occurrence of color unevenness due to errors caused by the optical paths of the excitation light and light in a wavelength band different from the excitation light being separate optical paths can be reduced. In one embodiment, the transmissive bending region 806 may be provided on the plate surface of the rotating wheel 801 that faces the excitation light irradiator 70, and the filter region 804 may be provided on the plate surface that faces the fixed phosphor 200. Furthermore, in one embodiment, in the fourth to sixth embodiments as well, a light guiding rod may be used instead of the light tunnel 175, the microlens array 90 described with reference to Fig. 5 may be arranged instead of the light tunnel 175, and a concave lens 181 may be arranged instead of the third condenser lens 178.

[0107] In one embodiment, the fluorescent wheel device 400 according to the third embodiment may be used as the fluorescent light-emitting device instead of the fixed fluorescent member 200 in the fourth to sixth embodiments. Furthermore, in one embodiment, the configuration corresponding to the rotating wheel 501 described with reference to FIGS. 10 and 11 may be applied to the fourth to sixth embodiments. Specifically, in the fourth and fifth embodiments, the filter region 604, 704 may have a third filter region on the same surface as the first filter region 604a and the second filter region 604b, which reflects yellow wavelength band light and transmits blue, green, and red wavelength band light. In the sixth embodiment, the filter region 804 may have a third filter region similar to the third filter region 504c on the same surface as the first filter region and the second filter region, which transmits yellow wavelength band light and reflects blue, green, and red wavelength band light.

[0108] The above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments may be embodied in various other forms, and various omissions, substitutions, and modifications may be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims.

[0109] The invention described in the first claim of the present application is as follows: [1] An excitation light irradiation device that emits excitation light; a rotating wheel device including a rotating wheel including a filter region that reflects or transmits light of a predetermined wavelength band different from the wavelength band of the excitation light and transmits the excitation light, and a transmission bending region that bends the excitation light and transmits it; a fluorescence emitting device that is irradiated with the excitation light that has passed through the filter region and emits fluorescence that includes light in the predetermined wavelength band toward the filter region, The rotating wheel device is characterized in that the optical axis of the excitation light that has passed through or been reflected by the rotating wheel overlaps with the optical axis of the fluorescence of the specified wavelength band that has been reflected by or passed through the filter area. [2] The filter region is provided in a region of the rotating wheel different from the transmission bending region, and reflects fluorescence in the predetermined wavelength band; The light source device described in [1] is characterized in that the rotating wheel device is arranged so that the optical axis of the excitation light that has passed through the transparent bending region overlaps with the optical axis of the fluorescence of the specified wavelength band that has been reflected by the filter region. [3] The rotating wheel includes an excitation light transmitting region that is provided in a region of the rotating wheel different from the transmission bending region and transmits the excitation light; the filter region is provided on a surface of the rotating wheel opposite to the transmission bending region, and reflects fluorescence in the predetermined wavelength band; The light source device described in [1] is characterized in that the rotating wheel device is arranged so that the optical axis of the excitation light that has passed through the excitation light transmission area overlaps with the optical axis of the fluorescence of the specified wavelength band that has been reflected by the filter area. [4] The rotating wheel includes an excitation light reflection region that is provided in a region of the rotating wheel different from the transmission bending region and that reflects the excitation light; the filter region is provided in a region on the surface of the rotating wheel opposite to the transmission bending region, and transmits fluorescence in the predetermined wavelength band; The light source device described in [1] is characterized in that the rotating wheel device is arranged so that the optical axis of the excitation light reflected by the excitation light reflection area overlaps with the optical axis of the fluorescence of the specified wavelength band that has passed through the filter area. [5] The light source device according to any one of [1] to [4], characterized in that the excitation light irradiation device is arranged on the opposite side of the rotating wheel from the side on which the fluorescence emitting device is arranged. [6] The light source device according to any one of [1] to [5], further comprising a light guide member that guides the excitation light that has passed through the rotary wheel to the fluorescence emitting device. [7] The light source device according to any one of [1] to [6], wherein the rotating wheel is arranged at an angle inclined with respect to a plane including the fluorescent light-emitting region of the fluorescent light-emitting device. [8] The light source device according to any one of [1] to [7], further comprising a light tunnel or a light guiding rod that guides the excitation light that has passed through the rotating wheel or that has been reflected by the rotating wheel and the fluorescence of the predetermined wavelength band that has been reflected by the filter region or that has passed through the filter region. [9] A light source device according to any one of [1] to [7], characterized in that it comprises a microlens array that guides the excitation light that has passed through or been reflected by the rotating wheel and the fluorescence of the predetermined wavelength band that has been reflected by or passed through the filter region.

[10] The light source device according to any one of [1] to [9], wherein the rotating wheel includes a transmission diffusion area that diffuses and transmits the excitation light that has passed through the rotating wheel.

[11] The light source device according to any one of [1] to

[10] , wherein a diffraction grating for diffracting the excitation light is formed in the transmission bending region.

[12] The light source device according to any one of [1] to

[10] , wherein a refractive member having an inclined surface for refracting the excitation light is formed in the transmissive bending region.

[13] The light source device according to any one of [1] to

[12] , wherein the fluorescent light emitting device is a fluorescent wheel device.

[14] The light source device according to any one of [1] to

[13] above, a display element for generating image light; a projection optical system that projects the image light emitted from the display element onto a projection target; a control unit that controls the light source device and the display element; A projection device comprising: [Explanation of symbols]

[0110] 10 Projection device 12 Front panel 12a Projection port 13 Rear panel 14 Right panel 15 Left panel 21 Input / output connector section 22 Input / output interface 23 Image conversion unit 24 Display encoder 25 Video RAM 26 Display driver 31 Image compression / expansion unit 32 Memory card 35 Ir receiving unit 36 ​​Ir processing unit 37 Key / indicator section 38 Control section 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 50 Display element 60 Light source device 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 80 Red / green light source device 81 Cooling fan 90 Microlens array 100 Rotating wheel device 101 Rotating wheel 104 Filter area 104a First filter region 104b Second filter region 105 Excitation light reflection region 106 Transmission bending region 106a: Transmission diffraction grating; 106b: Transmission refractive element; 106c transparent refractive element 107 transparent diffusion region 140 light guide optical system 141 first condenser lens 142 second condenser lens 150 first heat sink 170 Light source optical system 175 Light tunnel 178 Third condenser lens 179 Fourth condenser lens 181 concave lens 185 irradiation mirror 195 Condenser lens 200 Fixed phosphor 201 substrate 202 fluorescent light emitting region 220 Projection optical system 225 Fixed lens group 235 Movable lens group 242 Control circuit board 300 Rotating wheel device 301 Rotating wheel 304 filter region 305 reflective bending region 305a Reflective diffraction grating 305b Catadioptric element 305c Reflective / refractive element 400 Fluorescent wheel device 401 Fluorescent wheel 402 Fluorescent light emitting area 500 Rotating wheel device 501 Rotating wheel 504 filter area 504a first filter area 504b Second filter area 504c Third filter area 505 Excitation light reflection region 506 Transmission bending region 507 Transmittance diffusion area 560 Light source device 600 Rotating wheel device 601 Rotating wheel 604 filter region 604a first filter region 604b second filter region 606 transmission bending region 607 Transmittance diffusion area 660 Light source device 700 Rotating wheel device 701 Rotating wheel 704 filter region 706 transmission bending region 707 Excitation light reflection area 760 Light source device 800 Rotating wheel device 801 Rotating wheel 804 Filter region 805 Excitation light reflection region 806 Transmission bending area L1~L14 light S1, S2 irradiation spot

Claims

1. an excitation light irradiation device that emits excitation light; a rotating wheel device including a rotating wheel including a filter region that reflects light in a predetermined wavelength band different from the wavelength band of the excitation light and transmits the excitation light, and a transmission bending region that bends the excitation light and transmits it; a fluorescence emitting device that is irradiated with the excitation light that has passed through the filter region and emits a composite light that includes light in the predetermined wavelength band toward the filter region, the combined light includes residual excitation light resulting from reflection of the excitation light by a base material constituting the fluorescence-emitting device, and fluorescence emitted when the excitation light is irradiated onto a fluorescence-emitting region provided in a predetermined region of the base material, the filter region is provided in a region of the rotating wheel different from the transmission bending region, and reflects the fluorescence in the predetermined wavelength band and transmits the residual excitation light; The rotating wheel device is characterized in that the optical axis of the excitation light that is bent and transmitted through the rotating wheel overlaps with the optical axis of the fluorescence of the specified wavelength band that is reflected by the filter area.

2. 2. The light source device according to claim 1, wherein the excitation light irradiation device is disposed on the opposite side of the plate surface of the rotary wheel from the side on which the fluorescence light emitting device is disposed.

3. The light source device according to claim 1 or 2; a display element for generating image light; a projection optical system that projects the image light emitted from the display element onto a projection target; a control unit that controls the light source device and the display element; A projection device comprising:

Images