Light source device, projection device, and projection method

Abstract

To provide a light source device that can perform tint adjustment while reducing the size of the device, a projection device including the light source device, and a projection method.SOLUTION: A light source device of a projection device has a blue laser diode that emits excitation light, and a rotation wheel device 100 that includes a first rotation wheel 101 and a second rotation wheel 102 arranged coaxially. The first rotation wheel 101 has a first filter area 101a1 that transmits light in a predetermined wavelength band. The second rotation wheel 102 has a fluorescent emission area 102a arranged corresponding to the first filter area 101a1. The light in the predetermined wavelength band consists of light in a partial wavelength band of fluorescent light emitted from the fluorescent emission area 102a and excitation light. The blue laser diode is arranged such that the excitation light is incident on the rotation wheel device 100 at an angle at which the light reflected on the rotation wheel device 100 does not impinge on the blue laser diode.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a light source device, a projection device, and a projection method. [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, the projection device disclosed in Patent Document 1 includes a substrate having red and green phosphor layers and a reflection region, and a wheel device arranged on the rear side of the substrate and coaxially arranged with the substrate, and including a dichroic filter with a larger diameter than the substrate. A dichroic mirror is arranged between the excitation light source and the wheel device. The excitation light incident through the dichroic mirror is irradiated onto the phosphor layer on the substrate, and fluorescence is emitted. The emitted fluorescence is reflected by the dichroic mirror, passes through the radial outside of the substrate, passes through the dichroic filter, and enters the rod integrator to be used as a light source. In this way, the color purity can be increased by transmitting the fluorescence through the dichroic filter. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-212129 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the wheel device of the projection device of Patent Document 1, the dichroic filter is formed with a diameter larger than the substrate having the phosphor layer. When the excitation light transmitted through the dichroic mirror is used as a light source, the excitation light reflected from the substrate is reflected by the dichroic mirror, so that a λ / 4 wave plate needs to be provided between the substrate and the dichroic mirror, which may increase the size of the device.

[0006] An object of the present invention is to provide a light source device capable of adjusting color tone while reducing the size of the device, and a projection device and projection method including the light source device. [Means for solving the problem]

[0007] The light source device of the present invention includes an excitation light source that emits excitation light, and a rotating wheel device including a first rotating wheel and a second rotating wheel that are coaxially arranged, the first rotating wheel having a first filter region that transmits light of a predetermined wavelength band, the second rotating wheel having a fluorescent light emitting region that is arranged corresponding to the first filter region, the light of the predetermined wavelength band is composed of light of a part of the wavelength band of the fluorescence emitted from the fluorescent light emitting region and the excitation light, and the excitation light source is arranged so that the excitation light is incident on the rotating wheel device at an angle at which light reflected from the rotating wheel device does not hit the excitation light source. The second rotating wheel has the fluorescent light emitting region and a reflecting region having a reflective surface inclined to reflect the excitation light. It is characterized by:

[0008] Furthermore, the projection device of the present invention is characterized in that it comprises 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 screen, and a control unit that controls the light source device and the display element.

[0009] In addition, a projection method of the present invention includes a method for projecting a fluorescent light emitted from an excitation light source onto a rotating wheel device including a first rotating wheel and a second rotating wheel arranged on the same axis, the excitation light being incident at an angle such that light reflected from the rotating wheel device does not strike the excitation light source, and a first filter region of the first rotating wheel transmits a part of a wavelength band of fluorescence emitted from a fluorescence emission region of the second rotating wheel by being excited by the excitation light, and the fluorescence is emitted from the rotating wheel device. The excitation light is reflected by a reflection area that is arranged in parallel with the fluorescent light-emitting area and has an inclined reflection surface so as to reflect the excitation light, and is emitted from the rotary wheel device through a transmission area that is arranged on the first rotary wheel. The present invention is characterized by the above. Effect of the Invention

[0010] According to the present invention, it is possible to provide a light source device that can appropriately adjust color tone while reducing the size of the device, and a projection device and projection method that include this light source device. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a diagram showing functional circuit blocks of the projection device according to the embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic plan view showing the internal structure of a projection device according to an embodiment of the present invention. [Diagram 3] 1A is a schematic diagram showing a wheel device according to an embodiment of the present invention, in which (a) is a schematic plan view of a first rotating wheel and a second rotating wheel, and (b) is a schematic cross-sectional view showing the IIIb-IIIb cross section of (a). FIG. [Figure 4] 1A and 1B are schematic plan views showing a wheel device according to an embodiment of the present invention, in which (a) shows a first rotating wheel and (b) shows a second rotating wheel. [Diagram 5] 1 is a plan view schematic diagram showing a composite dichroic mirror according to an embodiment of the present invention. [Figure 6] 1 is a schematic plan view showing how excitation light is irradiated onto a rotating wheel device according to an embodiment of the present invention, where (a) shows how the excitation light passes through a composite dichroic mirror and is irradiated onto a reflection area of ​​the rotating wheel device, and (b) is an enlarged view of the area around the irradiation spot in (a). [Figure 7]1A is a schematic plan view showing how excitation light is irradiated onto a rotating wheel device according to an embodiment of the present invention, where (a) shows how the excitation light passes through a composite dichroic mirror and is irradiated onto a fluorescent light-emitting region of the rotating wheel device, causing fluorescence to be emitted, and (b) is an enlarged view of the area around the irradiation spot in (a). [Figure 8] 1A and 1B are schematic plan views showing a rotating wheel device according to a first modified example of an embodiment of the present invention, in which (a) shows a first rotating wheel and (b) shows a second rotating wheel. [Figure 9] 11 is a schematic plan view showing an internal structure of a projection device according to a second modified example of the embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to Fig. 1 to Fig. 9. Fig. 1 is a functional circuit block diagram of a projection device 10. The projection device control unit includes a CPU including an image conversion unit 23 and a control unit 38, a front-end unit including an input / output interface 22, and a formatter unit including a display encoder 24 and a display drive unit 26. Image signals of various standards input from the input / output connector unit 21 are converted by the image conversion unit 23 via the input / output interface 22 and the 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.

[0013] Furthermore, the display encoder 24 develops and stores the input image signal in a video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to a display driver .

[0014] The display drive unit 26 drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate in response to the image signal output from the display encoder 24. The projection device 10 forms an optical image with the reflected light from the display element 51 by irradiating the light beam emitted from the light source device 60 onto the display element 51 via a light guiding 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). 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.

[0015] Moreover, the image compression / expansion unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are compressed by processes such as ADCT and Huffman coding, and the data is written sequentially to a memory card 32, which is a removable recording medium. Furthermore, the image compression / expansion unit 31 reads out the 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.

[0016] The control unit 38 is responsible for controlling the operation of each circuit in the projection device 10, and is composed of a CPU, a ROM in which operating programs such as various settings are permanently stored, a RAM used as a work memory, and the like.

[0017] The key / indicator section 37 is composed of a main key and an indicator provided on the housing. An operation signal of the key / indicator section 37 is directly sent to the control section 38. In addition, a key operation signal from the remote controller is received by the Ir receiving section 35, demodulated into a code signal by the Ir processing section 36, and output to the control section 38.

[0018] 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 the playback mode, and drives a speaker 48 to emit amplified sound.

[0019] The control unit 38 controls the light source control circuit 41. The light source control circuit 41 individually controls the operation of the excitation light irradiation device 70 of the light source device 60 and the rotating 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.

[0020] 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 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 using a timer or the like even after the power to the projection device 10 body is turned off, or to turn off the power to the projection device 10 body depending on the results of temperature detection by the temperature sensors.

[0021] As will be described in detail later, the projection device control unit including the control unit 38 controls the blue laser diode 71 (excitation light source) and the rotating wheel 105 to emit light including red, blue and green wavelength bands in a time-division manner.

[0022] 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, the left and right of the projection device 10 refer to the left and right directions relative to the projection direction from the projection port 12a, and the front and rear refer to the screen side direction of the projection device 10 and the front and rear directions relative to the traveling direction of the light beam.

[0023] The projection device 10 includes a control circuit board 241 near the right panel 14. The control circuit board 241 includes a power supply circuit block, a light source control block, etc. The projection device 10 also includes a light source device 60, a light source optical system 170, and a projection optical system 220 on the left side of the control circuit board 241.

[0024] The light source device 60 includes an excitation light irradiating device 70 that is a light source of blue wavelength band light and also a light source of excitation light, and a red / green light source device 80 that is a light source of red wavelength band light and green wavelength band light. The red / green light source device 80 is composed of the excitation light irradiating device 70 and a rotating wheel device 100.

[0025] A light guide optical system 140 that guides each color light is disposed in the light source device 60. The light guide optical system 140 guides the light emitted from the excitation light irradiating device 70 and the red and green light source device 80 to the light source optical system 170.

[0026] The excitation light irradiation device 70 can be disposed at any position inside the projection device 10, and in this embodiment, it is disposed near the center of the projection device 10. The excitation light irradiation device 70 includes a blue laser diode 71 (excitation light source) which is a semiconductor light emitting element. A first heat sink 191 is provided on the right panel 14 side of the blue laser diode 71 to cool the blue laser diode 71. An incident portion 9a of an optical fiber 9 is disposed on the optical axis of the blue laser diode 71. An exit portion 9b of the optical fiber 9 is disposed facing the front side. A collimator lens 73 is disposed on the optical axis of the exit portion 9b of the optical fiber 9, which converts the emitted light from the blue laser diode 71 into parallel light so as to increase the directivity of the light.

[0027] In this embodiment, an example in which one blue laser diode 71 is arranged is shown, but a light source group may be formed by arranging a plurality of blue laser diodes 71 in a matrix shape, etc. In this case, an optical fiber 9 can be provided for each of the plurality of blue laser diodes 71. Also, a collimator lens 73 may be provided for each emission portion 9b of each optical fiber 9, or one collimator lens 73 can be arranged for the emission portions 9b of the plurality of optical fibers 9.

[0028] A composite dichroic mirror 141 is disposed on the exit side (front panel 12 side) of the collimator lens 73. Here, the optical axis of the collimator lens 73 is disposed on the right side (right panel 14 side) of the optical axis of the composite dichroic mirror 141.

[0029] A rotating wheel device 100 constituting a red / green light source device 80 is provided on the front panel 12 side of the composite dichroic mirror 141. The rotating wheel device 100 has a rotating wheel 105 including a first rotating wheel 101 and a second rotating wheel 102, a wheel motor 110, and a condenser lens group 150 including a first condenser lens 151 and a second condenser lens 152. The condenser lens group 150 is arranged on the same optical axis as the composite dichroic mirror 141. As will be described in detail later, the first rotating wheel 101 of the rotating wheel device 100 emits red wavelength band light, green wavelength band light, and blue wavelength band light resulting from reflection of the excitation light by irradiating irradiation spots S1 and S2 (see FIG. 3) with excitation light. In addition, a third heat sink 193 for cooling the rotating wheel device 100 is arranged on the front panel 12 side of the rotating wheel device 100. The rotating wheel device 100 will be described in detail later.

[0030] The light guide optical system 140 has a composite dichroic mirror 141, a third condenser lens 142, and a reflecting mirror 143. The third condenser lens 142 is disposed on the optical axis of the composite dichroic mirror 141 on the left panel 15 side. The reflecting mirror 143 is disposed on the optical axis of the third condenser lens 142 on the left panel 15 side, and converts the optical axis by 90 degrees toward the rear panel 13 side.

[0031] The light source optical system 170 includes a fourth condenser lens 173, a light guiding device 175 such as a light tunnel or a glass rod, a fifth condenser lens 178, an optical axis conversion mirror 181, a sixth condenser lens 183, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 is also a part of the projection optical system 220 because it outputs, toward the projection optical system 220, the image light emitted from the display element 51 arranged on the rear panel 13 side of the condenser lens 195.

[0032] The fourth condenser lens 173, the light guiding device 175, the fifth condenser lens 178 and the optical axis changing mirror 181 are arranged in this order on the optical axis of the reflection mirror 143 on the rear panel 13 side. The sixth condenser lens 183 is arranged on the optical axis of the optical axis changing mirror 181 on the left panel 15 side, and the irradiation mirror 185 is arranged on the optical axis of the sixth condenser lens 183 on the left panel 15 side. The condenser lens 195 is arranged on the rear panel 13 side of the irradiation mirror 185, on the front panel 12 side of the display element 51.

[0033] A second heat sink 192 is provided on the rear panel 13 side of the display element 51. The second heat sink 192 cools the display element 51.

[0034] 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 built into a fixed lens barrel. The movable lens group 235, which is similarly arranged on the optical axis, is built into a movable lens barrel, and can be moved manually or automatically to enable zoom adjustment and focus adjustment.

[0035] The light of each color wavelength band emitted from the rotating wheel device 100 is incident on the composite dichroic mirror 141 via the condenser lens group 150. The composite dichroic mirror 141, which will be described in detail later, transmits part of the incident light as waste light and reflects the rest to be used as a light source, and converts the optical axis by 90 degrees toward the left panel 15 side.

[0036] The light reflected by the composite dichroic mirror 141 is incident on the fourth condenser lens 173 via the third condenser lens 142 and the reflecting mirror 143. The light emerging from the fourth condenser lens 173 is reflected by the optical axis conversion mirror 181 towards the sixth condenser lens 183 via the light guiding device 175 and the fifth condenser lens 178. The light incident on the sixth condenser lens 183 is irradiated onto the display element 51 via the irradiation mirror 185 and the condenser lens 195. The display element 51, which is a DMD, can project a color image onto a screen from the projection port 12a via the projection optical system 220 by displaying light of each color in a time-division manner according to data.

[0037] Here, the rotating wheel device 100 will be described in detail. As shown in Fig. 3(a) and Fig. 3(b), the rotating wheel device 100 includes a wheel motor 110, and the wheel motor 110 includes a motor shaft 110a. A disk-shaped first rotating wheel 101 is fixed to the motor shaft 110a. A disk-shaped second rotating wheel 102 having approximately the same diameter as the first rotating wheel 101 is fixed to the motor shaft 110a on the rear side of the first rotating wheel 101. The first rotating wheel 101 and the second rotating wheel 102 are arranged coaxially and parallel to each other.

[0038] 4(a), the first rotating wheel 101 is a color wheel having three segments formed by a first color filter 101a, a second color filter 101b, and a transmissive region 101c. Each segment is formed in an area obtained by dividing the first rotating wheel 101 into three equal parts of 120 degrees each.

[0039] The first color filter 101a has a first filter region 101a1 on the radially inner side. The first color filter 101a further has a second filter region 101a2 arranged radially adjacent to the first filter region 101a1 on the outer side. Similarly, the second color filter 101b arranged in parallel with the first color filter 101a has a first filter region 101b1 on the radially inner side and a second filter region 101b2 arranged radially adjacent to the outer side.

[0040] The first filter regions 101a1 and 101b1 can transmit light of a predetermined wavelength band consisting of excitation light and light of a part of the wavelength band of the fluorescence emitted from the fluorescence-emitting region 102a described below. Specifically, the first filter region 101a1 transmits blue and green wavelength band light, which are the wavelength band of the excitation light, and reflects red wavelength band light. The first filter region 101b1 transmits blue and red wavelength band light and reflects green wavelength band light.

[0041] The second filter regions 101a2 and 101b2 can transmit light in a predetermined wavelength band excluding the wavelength band of the excitation light (in other words, a wavelength band obtained by excluding the wavelength band of the excitation light from the wavelength band that the first filter regions 101a1 and 101b1 can transmit). Specifically, the second filter region 101a2 transmits green wavelength band light and reflects blue and red wavelength band light, which are the wavelength bands of the excitation light. The second filter region 101b2 transmits red wavelength band light and reflects blue and green wavelength band light.

[0042] The transmission area 101c of the first rotating wheel 101 is made of a transmission glass and can transmit light of all wavelength bands.

[0043] The base material 102f of the second rotating wheel 102 can be formed of a metal base material such as copper or aluminum. The surface of the base material 102f is mirror-finished by silver deposition or the like. The fluorescent light-emitting region 102a is made of a yellow phosphor layer having a yellow phosphor on the surface of the base material 102f. The fluorescent light-emitting region 102a is irradiated with excitation light, which is blue wavelength band light emitted from the excitation light irradiating device 70, and emits fluorescence in the yellow wavelength band. A part of the excitation light irradiated to the fluorescent light-emitting region 102a excites the phosphor and emits fluorescence, and a part of the excitation light is reflected by the mirror-finished base material 102f and excites the phosphor, but a part of the excitation light reflected by the base material 102f does not excite the phosphor and is emitted as it is from the fluorescent light-emitting region 102a. In addition, when the phosphor is excited, fluorescence is emitted in all directions, a part of it is emitted as it is, and the other part is reflected by the base material 102f and emitted from the fluorescent light-emitting region 102a.

[0044] The second rotating wheel 102 includes a reflection region 102b arranged in parallel with the fluorescence light emitting region 102a. As shown in FIG. 3(b), the reflection region 102b includes a reflection member 102b1 having a reflection surface that diffusely reflects the excitation light. The reflection surface of the reflection member 102b1 is an inclined surface that slopes downward from the outer side toward the inner side in the radial direction of the second rotating wheel 102. The inclination angle of the reflection surface of the reflection member 102b1 is set at various angles. The reflection surface of the reflection member 102b1 is formed with fine irregularities by sandblasting or the like, and can diffusely reflect the irradiated excitation light.

[0045] As shown in FIG. 3(a), the fluorescent light-emitting region 102a of the second rotating wheel 102 is arranged so as to overlap with the first color filter 101a (first filter region 101a1, second filter region 101a2) and the second color filter 101b (first filter region 101b1, second filter region 101b2) in a front view. In other words, the fluorescent light-emitting region 102a is arranged corresponding to the first filter regions 101a1 and 101b1, and also corresponding to the second filter regions 101a2 and 101b2. More specifically, the angle range of the fluorescent light-emitting region 102a is approximately the same as the combined angle range of the first color filter 101a and the second color filter 101b, and the ends of both are arranged so as to approximately coincide with each other in a front view. Furthermore, the fluorescent light-emitting region 102a is disposed across the first filter regions 101a1 and 101b1 and the second filter regions 101a2 and 101b2 in the radial direction. In this embodiment, in the radial direction (width direction) of the fluorescent light-emitting region 102a, approximately the inner half of the fluorescent light-emitting region 102a corresponds to the first filter regions 101a1 and 101b1, and approximately the outer half of the fluorescent light-emitting region 102a corresponds to the second filter regions 101a2 and 101b2. That is, approximately one half of the fluorescent light-emitting region 102a in the width direction overlaps with the first filter regions 101a1 and 101b1, and approximately the other half of the fluorescent light-emitting region 102a in the width direction overlaps with the second filter regions 101a2 and 101b2.

[0046] Similarly, the reflective area 102b of the second rotating wheel 102 is disposed in correspondence with the transmissive area 101c. That is, the reflective area 102b is disposed so as to overlap with the transmissive area 101c. The angular range of the reflective area 102b is substantially the same as that of the transmissive area 101c, and the ends of the reflective area 102b and the transmissive area 101c are disposed so as to substantially coincide with each other.

[0047] As shown in FIG. 5, the composite dichroic mirror 141 is formed in a rectangular shape that is long in the left-right direction of FIG. 5. The composite dichroic mirror 141 shown in FIG. 2, FIG. 6(a), FIG. 6(b), FIG. 7(a), and FIG. 7(b) shows the longitudinal direction of the composite dichroic mirror 141 in a plan view. An elliptical total reflection region 141a whose major axis direction is the same as the longitudinal direction is provided in the center of the composite dichroic mirror 141. The total reflection region 141a may be a region that reflects at least the excitation light (light in the blue wavelength band). The region other than the total reflection region 141a is a dichroic region 141b. The dichroic region 141b reflects light in a predetermined wavelength band (i.e., fluorescence) excluding the wavelength band of the excitation light. In other words, the dichroic region 141b transmits the excitation light (light in the blue wavelength band) and reflects the fluorescence emitted from the rotating wheel device 100 (light in the red wavelength band and light in the green wavelength band).

[0048] Next, the incidence and emission of light to the rotating wheel device 100 will be described. First, based on Fig. 6(a) and Fig. 6(b), a case where blue wavelength band light, which is excitation light, is emitted from the rotating wheel device 100 will be described. Here, the position on the first rotating wheel 101 where the excitation light (light L1 shown by solid lines in Fig. 6(a) and Fig. 6(b)) is incident is set as an irradiation spot S1, and the position on the second rotating wheel 102 is set as an irradiation spot S2 (see also Fig. 3(a)). The irradiation spot S1 on the first rotating wheel 101 is set as a position shifted radially inward of the first rotating wheel 101 from the optical axis of the condenser lens group 150. Also, in Fig. 6(a) and Fig. 6(b), the transmission area 101c of the first rotating wheel 101 and the reflection area 102b of the second rotating wheel 102 are located in the irradiation spots S1 and S2.

[0049] The excitation light emitted from the emission portion 9b of the optical fiber 9 passes through the vicinity of the end of the dichroic region 141b of the composite dichroic mirror 141 via the collimator lens 73, and enters the condenser lens group 150. The excitation light is refracted by the dichroic region 141b of the composite dichroic mirror 141 and the condenser lens group 150, and is obliquely incident on the rotating wheel 105. Specifically, the excitation light is obliquely incident on the irradiation spot S1 of the first rotating wheel 101, and further obliquely incident on the irradiation spot S2 of the second rotating wheel 102. Note that the excitation light may be refracted by the transmission region 101c and obliquely incident only on the second rotating wheel 102, without being obliquely incident on the first rotating wheel 101.

[0050] The excitation light that passes through the transmission region 101c and is obliquely incident on the second rotating wheel 102 is incident on the reflection region 102b of the second rotating wheel 102. The excitation light that is incident on the reflection region 102b is reflected by the reflection member 102b1. Here, since the reflection surface of the reflection member 102b1 is formed obliquely, the excitation light that is obliquely irradiated on the reflection surface of the reflection member 102b1 is reflected with its optical axis approximately aligned with the optical axis of the condenser lens group 150, which is the subsequent optical member. In this way, the excitation light that is irradiated on the reflection surface of the reflection member 102b1 passes through the transmission region 101c again and is emitted from the first rotating wheel 101. That is, the blue laser diode 71, which is the excitation light source, is disposed so that the excitation light is incident on the rotating wheel device 100 (rotating wheel 105) at an angle such that the light L1 reflected from the rotating wheel device 100 (rotating wheel 105) does not hit the blue laser diode 71.

[0051] The excitation light emitted from the first rotating wheel 101 enters the condenser lens group 150 and is emitted from the condenser lens group 150. The excitation light emitted from the condenser lens group 150 is irradiated onto the total reflection region 141a of the composite dichroic mirror 141 and is reflected toward the third condenser lens 142. In this way, the excitation light that is made into the blue wavelength band light can be used as light source light.

[0052] Total reflection region 141a of composite dichroic mirror 141 is formed in an elliptical shape because composite dichroic mirror 141 is disposed at an angle of 45 degrees with respect to the optical axis so as to reflect light toward third condenser lens 142.

[0053] Next, a case where fluorescence of green wavelength band light (first wavelength band light) is emitted from the rotary wheel device 100 will be described with reference to Figs. 7(a) and 7(b). Here, the first color filter 101a (first filter region 101a1) and the fluorescence light-emitting region 102a are located in the irradiation spots S1 and S2. The excitation light irradiated to the irradiation spot S1 via the collimator lens 73 and the condenser lens group 150 passes through the first filter region 101a1 and is irradiated to the fluorescence light-emitting region 102a of the irradiation spot S2. When the excitation light is irradiated to the phosphor of the fluorescence light-emitting region 102a, the fluorescence of yellow wavelength band light is emitted. Of the fluorescence emitted in all directions, the red wavelength band light is reflected by the first filter region 101a1 and the second filter region 101a2 and is discarded (light F2 indicated by a dashed line). Here, the light emitted from the fluorescence light-emitting region 102a includes fluorescence in a yellow wavelength band and excitation light (hereinafter referred to as "residual excitation light") that is not irradiated to the phosphor and is reflected by the base material 102f as it is. Of the fluorescence emitted from the fluorescence light-emitting region 102a, the fluorescence that is incident on the outer second filter region 101a2 reflects not only red wavelength band light but also blue wavelength band light (i.e., residual excitation light (light LF shown by a dashed line)). Therefore, the fluorescence in a green wavelength band (light F1 shown by a dashed line) emitted from the first color filter 101a of the first rotating wheel 101 has the residual excitation light removed from the green wavelength band light that has passed through the second filter region 101a2. The excitation light reflected by the second filter region 101a2 can also be irradiated to the fluorescence light-emitting region 102a again to excite the phosphor.

[0054] The fluorescent light in the green wavelength band emitted from first color filter 101a, which is diffuse light, is irradiated onto almost the entire surface of composite dichroic mirror 141. Then, of the fluorescent light in the green wavelength band (light F1) irradiated onto dichroic region 141b, the blue wavelength band light is transmitted (light DL1 indicated by the arrow) and the green wavelength band light is reflected. Total reflection region 141a of composite dichroic mirror 141 also reflects slight residual excitation light (light DL2 indicated by the arrow) that remains in the green wavelength band light. By passing through composite dichroic mirror 141, it is possible to obtain green wavelength band light from which most of the residual excitation light has been removed.

[0055] The same is true when the second color filter 101b is positioned at the irradiation spot S1 and red wavelength band light (second wavelength band light) is emitted from the rotary wheel device 100. That is, yellow wavelength band fluorescence is emitted from the fluorescence emission region 102a irradiated with the excitation light, green wavelength band light (light F2 in FIG. 7(b)) is reflected by the first filter region 101b1, and residual excitation light (light LF in FIG. 7(b)) which is blue wavelength band light in addition to the green wavelength band light is reflected by the second filter region 101b2. The light emitted from the second color filter 101b is irradiated onto the composite dichroic mirror 141, and of the light irradiated onto the dichroic region 141b, residual excitation light (arrow DL1) which is blue wavelength band light is transmitted, and red wavelength band light (light F2) and residual excitation light (arrow DL2) are reflected.

[0056] In addition, the first filter regions 101a1 and 101b1 and the second filter regions 101a2 and 101b2 can adjust the color by transmitting any wavelength band of green or red wavelength band light. For example, even if the light is in the green wavelength band, the wavelength of light close to the red wavelength band or the blue wavelength band can be reflected to adjust the color of green.

[0057] (Variation 1) Next, a first modified example of the above-mentioned embodiment will be described with reference to Figs. 8(a) and 8(b). Figs. 8(a) and 8(b) are diagrams corresponding to Figs. 4(a) and 4(b). In this first modified example, the rotating wheel 105 of the rotating wheel device 100 has a first rotating wheel 101A shown in Fig. 8(a) and a second rotating wheel 102A shown in Fig. 8(b). The first rotating wheel 101A has a first color filter 101Aa, a second color filter 101Ab, and a transmission region 101c. The first color filter 101Aa and the transmission region 101c are provided in an angular range of about 90 degrees. The second color filter 101Ab is provided in an angular range of about 180 degrees. The first color filter 101Aa is made of only the first filter region 101a1. The second color filter 101Ab is made of only the first filter region 101b1. The first filter region 101a1 transmits blue and green wavelength band light and reflects red wavelength band light, while the first filter region 101b1 transmits blue and red wavelength band light and reflects green wavelength band light.

[0058] The second rotating wheel 102A has a first fluorescent light-emitting region 102a-1, a second fluorescent light-emitting region 102a-2, and a reflection region 102b. The first fluorescent light-emitting region 102a-1 and the reflection region 102b are provided in an angular range of about 90 degrees, and the second fluorescent light-emitting region 102a-2 is provided in an angular range of about 180 degrees. The second fluorescent light-emitting region 102a-2 has a larger area than the first fluorescent light-emitting region 102a-1. The first fluorescent light-emitting region 102a-1 includes a phosphor layer made of a green phosphor that emits fluorescence in a green wavelength band. The second fluorescent light-emitting region 102a-2 includes a phosphor layer made of a red phosphor that emits fluorescence in a red wavelength band. The first fluorescent light-emitting region 102a-1 is provided corresponding to the first filter region 101a1. Similarly, the second fluorescent light-emitting region 102a-2 is provided corresponding to the first filter region 101b1. The reflective area 102b is provided in correspondence with the transmissive area 101c of the first rotating wheel 101A. The reflective area 102b is provided with a reflective member 102b1 having an inclined reflective surface.

[0059] In the rotating wheel 105 of the rotating wheel device 100 of the present modified example 1, the excitation light is obliquely incident on the first rotating wheel 101A at an irradiation spot S1, and the excitation light is obliquely incident on the second rotating wheel 102A at an irradiation spot S2. When the transmission region 101c is located in the irradiation spot S1, the excitation light is reflected by the reflecting member 102b1 located in the irradiation spot S2 and used as a light source of blue wavelength band light. When the first color filter 101Aa (first filter region 101a1) is located in the irradiation spot S1, the excitation light is irradiated onto the first fluorescent light-emitting region 102a-1 of the irradiation spot S2, fluorescence in the green wavelength band is emitted, and green wavelength band light that has been color-adjusted, such as by cutting green light that is closer to blue, is emitted from the first color filter 101Aa (first filter region 101a1). Of the green wavelength band light emitted from the first color filter 101Aa (first filter region 101a1), the light irradiated onto the dichroic region 141b of the composite dichroic mirror 141 transmits residual excitation light. Similarly, when the second color filter 101Ab (first filter region 101b1) is located at the irradiation spot S1, the second fluorescence emission region 102a-2 of the irradiation spot S2 is irradiated with excitation light, fluorescence in the red wavelength band is emitted, and red wavelength band light with a color adjustment such as cutting red light leaning to green is emitted from the second color filter 101Ab (first filter region 101b1). Similarly, residual excitation light is removed from this red wavelength band light by the dichroic region 141b of the composite dichroic mirror 141.

[0060] In the first modification, the second fluorescent light-emitting region 102a-2 is formed longer than the first fluorescent light-emitting region 102a-1. This allows a long duty period even for fluorescence from a red phosphor that produces a relatively small amount of light, thereby compensating for the small amount of light.

[0061] (Variation 2) Next, a second modification of the above-described embodiment will be described with reference to Fig. 9. Projection device 10B of the second modification is obtained by arranging dichroic mirror 143B on the optical axis of fourth condenser lens 173 on the front panel 12 side in light source device 60 of projection device 10 of this embodiment, and providing red light source device 120 on the front panel 12 side of dichroic mirror 143B. Red light source device 120 has red light source 121 and condenser lens group 125 that condenses red wavelength band light emitted from red light source 121. Although not shown, red light source device 120 can be provided with a cooling device such as a heat sink as appropriate.

[0062] The rotary wheel device 100 of the projection device 10B of the present modified example 2 can be formed so that the fluorescent light emitting region 102a of the second rotary wheel 102 is provided with a phosphor layer made of a green phosphor. The first rotary wheel 101 can be provided with only the first color filter 101a having the first filter region 101a1 corresponding to the fluorescent light emitting region 102a. The first filter region 101a1 transmits blue wavelength band light and green wavelength band light and reflects red wavelength band light. The dichroic mirror 143B reflects blue wavelength band light and green wavelength band light and transmits red wavelength band light. This allows the light source of the blue wavelength band light to be the blue laser diode 71, the light source of the red wavelength band light to be the red light emitting diode, and the green wavelength band light to be color-adjusted through the first color filter 101a.

[0063] Although the embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various modifications can be made to the present invention. For example, the first rotating wheel 101 and the second rotating wheel 102 of the rotating wheel device 100 can be arranged such that the second rotating wheel 102 is provided on the front side and the first rotating wheel 101 is provided on the rear side. In this case, the exit portion 9b of the optical fiber 9 is arranged so that the excitation light is incident from the wheel motor 110 side.

[0064] In addition, the first filter regions 101a1, 101b1 and the second filter regions 101a2, 101b2 may be adjacent to each other in the radial direction. For example, the second filter regions 101a2, 101b2 may be arranged on the radial inside, and the first filter regions 101a1, 101b1 may be arranged on the radial outside. In this case, the excitation light may be configured to be obliquely incident from the outer first filter regions 101a1, 101b1. In this case, the direction of the inclined reflecting surface of the reflecting member 102b1 may be reversed from that of this embodiment, so that the excitation light may be reflected from the radial outside to the radial inside.

[0065] As described above, the light source device 60 of this embodiment has a blue laser diode 71 which is an excitation light source that emits excitation light, and a first rotating wheel 101, 101A and a second rotating wheel 102, 102A which are arranged coaxially, the first rotating wheel 101, 101A has a first filter region 101a1, 101b1 which transmits light of a predetermined wavelength band, the second rotating wheel 102, 102A has a fluorescent light-emitting region 102a which is arranged corresponding to the first filter region 101a1, 101b1, the light of the predetermined wavelength band is composed of a part of the wavelength band of the fluorescence emitted from the fluorescent light-emitting region 102a and the excitation light, and the excitation light source is arranged so that it is incident on the rotating wheel device 100 at an angle such that the excitation light reflected from the rotating wheel device 100 does not hit the excitation light source.

[0066] This allows the first filter region 101a1, which adjusts the color of the light from the light source, and the fluorescent light-emitting region 102a to be in the same rotating wheel device 100, making it possible to adjust the color of the fluorescence while reducing the size of the light source device 60.

[0067] The first rotary wheel 101 also has second filter regions 101a2 and 101b2 that are disposed radially adjacent to the first filter regions 101a1 and 101b1 and transmit light of a predetermined wavelength band excluding light corresponding to the wavelength band of the excitation light. This makes it possible to remove residual excitation light contained in the fluorescence and further adjust the color of the fluorescence.

[0068] The composite dichroic mirror 141 has an area that reflects the excitation light, specifically, a total reflection area 141a, and a dichroic area 141b that transmits the excitation light and reflects the fluorescence, thereby making it possible to further remove residual excitation light.

[0069] Moreover, the total reflection region 141a of the composite dichroic mirror 141 is elliptical in shape, so that the excitation light of the blue wavelength band light emitted from the rotary wheel device 100 can be efficiently reflected.

[0070] The second rotating wheel 102 has a fluorescent light emitting region 102a and a reflecting region 102b with an inclined reflecting surface to reflect the excitation light. The excitation light reflected by the reflecting region 102b is reflected in alignment with the optical axis of the optical member. This allows the excitation light, which is incident obliquely, to be emitted from the rotating wheel device 100 as a blue light source in alignment with the optical axis of the subsequent optical member such as the condenser lens group 150.

[0071] The first color filter 101a includes a first filter region 101a1 in which the light of a predetermined wavelength band is the excitation light and a green wavelength band light that is a first wavelength band light having a wavelength band different from that of the excitation light, and the second color filter 101b includes a first filter region 101b1 in which the light of a predetermined wavelength band is the excitation light and a red wavelength band light that is a second wavelength band light that is different from that of the excitation light and is also different from the first wavelength band light. This allows color adjustment to be performed for the two different wavelength band lights.

[0072] Furthermore, the fluorescence emitted from the fluorescence light-emitting region 102a can be a green wavelength band light, which is a first wavelength band light, and a red wavelength band light, which is a second wavelength band light. This allows the fluorescence light-emitting region 102a to be a phosphor layer made of a phosphor that emits a single type of fluorescence (e.g., a yellow phosphor), making it possible to provide a rotating wheel 105 that is easy to manufacture.

[0073] The fluorescent light-emitting region 102a has a first fluorescent light-emitting region 102a-1 that emits fluorescence of the first wavelength band light, i.e., green wavelength band light, and a second fluorescent light-emitting region 102a-2 that emits fluorescence of the second wavelength band light, i.e., red wavelength band light, so that two different phosphor layers can be used as the fluorescent light-emitting region 102a.

[0074] The second fluorescent light-emitting region 102a-2 is formed to have a larger area than the first fluorescent light-emitting region 102a-1, which allows the use of a phosphor layer that has a small amount of light, for example, a red phosphor.

[0075] Moreover, the projection devices 10 and 10B include a light source device 60, a display element 51 that generates image light, a projection optical system that projects the image light emitted from the display element 51 onto a screen, and a control unit that controls the light source device 60 and the display element 51. This makes it possible to obtain the projection devices 10 and 10B that can obtain color-adjusted light source light and project clear image light, and that are formed in a small size.

[0076] Moreover, the projection method of the projection devices 10 and 10B is such that excitation light from a blue laser diode 71, which is an excitation light source, is incident on the rotating wheel device 100 including a first rotating wheel 101, 101A and a second rotating wheel 102, 102A arranged on the same axis at an angle at which the light reflected from the rotating wheel device 100 does not strike the excitation light source, and a part of the wavelength band of the fluorescence emitted from the fluorescence emission region 102a excited by the excitation light is transmitted by the first filter regions 101a1 and 101b1 to emit the fluorescence from the rotating wheel device 100. This makes it possible for the compact projection devices 10 and 10B to project a projection image with adjusted color.

[0077] In addition, the projection method of the projection devices 10 and 10B is such that the excitation light is reflected by a reflection region 102b, which is provided in parallel with the fluorescent light-emitting region 102a and has an inclined reflection surface so as to reflect the excitation light, and is emitted from the rotary wheel device 100 through a transmission region provided in the first rotary wheel 101. This makes it possible to project image light using the excitation light of the excitation light source as a light source.

[0078] In addition, the above-described embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

[0079] The invention described in the first claim of this application is set forth below. [1] An excitation light source that emits excitation light; A rotating wheel device including a first rotating wheel and a second rotating wheel arranged coaxially; having the first rotating wheel has a first filter area that transmits light of a predetermined wavelength band; the second rotating wheel has a fluorescent light emitting region disposed corresponding to the first filter region; the light in the predetermined wavelength band is composed of light in a part of the wavelength band of the fluorescence emitted from the fluorescence light-emitting region and the excitation light, A light source device characterized in that the excitation light source is positioned so that the excitation light is incident on the rotating wheel device at an angle such that light reflected from the rotating wheel device does not hit the excitation light source. [2] The light source device described in [1], characterized in that the first rotating wheel has a second filter region arranged radially adjacent to the first filter region and transmitting light in the specified wavelength band except for light corresponding to the wavelength band of the excitation light. [3] A composite dichroic mirror onto which the light emitted from the first rotating wheel is incident, The light source device according to [1] or [2], characterized in that the composite dichroic mirror has a region that reflects the excitation light and a dichroic region that transmits the excitation light and reflects the fluorescence emitted from the fluorescence-emitting region. [4] The light source device according to [3], wherein the region of the composite dichroic mirror that reflects the excitation light is a total reflection region. [5] The light source device according to [4], wherein the total reflection area is elliptical. [6] The light source device described in any one of [1] to [5], characterized in that the second rotating wheel has the fluorescent light emitting region and a reflective region having a reflective surface inclined to reflect the excitation light. [7] The light source device described in [6], characterized in that the excitation light reflected by the reflective area passes through the first rotating wheel, then passes through an optical element, and is reflected in alignment with the optical axis of the optical element. [8] A first color filter including the first filter region in which the light of the predetermined wavelength band is the excitation light and a first wavelength band light having a wavelength band different from that of the excitation light; a second color filter including the first filter region in which the light of the predetermined wavelength band is the excitation light and a second wavelength band light different from the excitation light and different from the first wavelength band light; The light source device according to any one of [1] to [7] above, comprising: [9] The light source device according to [8], wherein the fluorescence emitted from the fluorescence emission region contains the first wavelength band light and the second wavelength band light.

[10] The light source device according to [8], wherein the fluorescent emission region includes a first fluorescent emission region which emits fluorescence that is the first wavelength band light, and a second fluorescent emission region which emits fluorescence that is the second wavelength band light.

[11] The first fluorescent light-emitting region emits fluorescence in a green wavelength band, and the second fluorescent light-emitting region emits fluorescence in a red wavelength band; The light source device according to

[10] , wherein the second fluorescent light-emitting region is formed to have a larger area than the first fluorescent light-emitting region.

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

[11] , A display element for generating image light; a projection optical system that projects the image light emitted from the display element onto a screen; A control unit that controls the light source device and the display element; A projection device comprising:

[13] An excitation light from an excitation light source is incident on a rotating wheel device including a first rotating wheel and a second rotating wheel arranged on the same axis at an angle such that light reflected from the rotating wheel device does not hit the excitation light source; a first filter region of the first rotating wheel transmits a portion of a wavelength band of fluorescence emitted from a fluorescent emission region of the second rotating wheel by the excitation light, and the fluorescence is emitted from the rotating wheel device.

[14] The projection method described in

[13] , characterized in that the excitation light is reflected by a reflective area arranged in parallel with the fluorescent light-emitting area and having a reflective surface inclined to reflect the excitation light, and is emitted from the rotating wheel device through a transparent area provided in the first rotating wheel. [Explanation of symbols]

[0080] 9 Optical fiber 9a Incident part 9b Output section 10 Projection device 10B 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 section 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 51 Display element 60 Light source device 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 80 Red / green light source device 100 Rotating wheel device 101 1st rotating wheel 101A 1st rotating wheel 101Aa 1st color filter 101Ab 2nd color filter 101a: first color filter; 101a1: first filter region 101a2: second filter region; 101b: second color filter 101b1 First filter area 101b2 Second filter area 101c transparent area 102 second rotating wheel 102A second rotating wheel 102a fluorescent light emitting area 102a-1: First fluorescent light emitting region 102a-2: Second fluorescent light emitting region 102b Reflection area 102b1 Reflective member 102f Base material 105 Rotating wheel 110 Wheel motor 110a Motor shaft 120 Red light source device 121 Red light source 125 Condenser lens group 140 Light guide optical system 141 Composite dichroic mirror 141a Total reflection area 141b Dichroic area 142 Third focusing lens 143 Reflecting mirror 143B Dichroic mirror 150 Condenser lens group 151 First focusing lens 152 Second focusing lens 170 Light source optical system 173 Fourth condenser lens 175 Light guide device 178 Fifth focusing lens 181 Optical axis conversion mirror 183 6th condenser lens 185 Irradiation mirror 191 1st heat sink 192 2nd heat sink 193 3rd heat sink 195 Condenser lens 220 Projection optical system 225 Fixed lens group 235 Movable lens group 241 Control circuit board DL, F1, F2, L1, LF light S Irradiation spot SB System bath

Claims

1. An excitation light source that emits excitation light; A rotating wheel device including a first rotating wheel and a second rotating wheel arranged coaxially; having the first rotating wheel has a first filter region that transmits light of a predetermined wavelength band; the second rotating wheel has a fluorescent light emitting region disposed corresponding to the first filter region; the light in the predetermined wavelength band is composed of light in a part of the wavelength band of the fluorescence emitted from the fluorescence light-emitting region and the excitation light, the excitation light source is disposed so that the excitation light is incident on the rotating wheel device at an angle such that light reflected from the rotating wheel device does not strike the excitation light source; The second rotating wheel has the fluorescent light emitting region and a reflecting region having an inclined reflecting surface for reflecting the excitation light.

2. The light source device according to claim 1, characterized in that the first rotating wheel has a second filter region arranged radially adjacent to the first filter region and transmitting light in the specified wavelength band except for light corresponding to the wavelength band of the excitation light.

3. a composite dichroic mirror on which the light emitted from the first rotating wheel is incident, 3. The light source device according to claim 1, wherein the composite dichroic mirror has a region that reflects the excitation light, and a dichroic region that transmits the excitation light and reflects the fluorescence emitted from the fluorescence emission region.

4. 4. The light source device according to claim 3, wherein the region of the composite dichroic mirror that reflects the excitation light is a total reflection region.

5. 5. The light source device according to claim 4, wherein the total reflection area is elliptical.

6. 2 . The light source device according to claim 1 , wherein the excitation light reflected by the reflective region passes through the first rotating wheel, then passes through an optical member, and is reflected in alignment with an optical axis of the optical member.

7. a first color filter including the first filter region in which the light of the predetermined wavelength band is the excitation light and a first wavelength band light having a wavelength band different from that of the excitation light; a second color filter including the first filter region in which the light of the predetermined wavelength band is the excitation light and a second wavelength band light different from the excitation light and different from the first wavelength band light; 7. The light source device according to claim 1, further comprising:

8. The light source device according to claim 7 , wherein the fluorescence emitted from the fluorescence emission region includes the first wavelength band light and the second wavelength band light.

9. 8. The light source device according to claim 7, wherein the fluorescence emission region includes a first fluorescence emission region that emits fluorescence of the first wavelength band light, and a second fluorescence emission region that emits fluorescence of the second wavelength band light.

10. the first fluorescent light-emitting region emits fluorescence in a green wavelength band, and the second fluorescent light-emitting region emits fluorescence in a red wavelength band; The light source device according to claim 9 , wherein the second fluorescent light-emitting region is formed to have a larger area than the first fluorescent light-emitting region.

11. A light source device according to any one of claims 1 to 10, A display element for generating image light; a projection optical system that projects the image light emitted from the display element onto a screen; A control unit that controls the light source device and the display element; A projection device comprising:

12. an excitation light from an excitation light source is incident on a rotating wheel device including a first rotating wheel and a second rotating wheel arranged on the same axis at an angle such that light reflected from the rotating wheel device does not strike the excitation light source; a first filter region of the first rotating wheel transmits a part of a wavelength band of the fluorescence emitted from the fluorescence emission region of the second rotating wheel by the excitation light, and the fluorescence is emitted from the rotating wheel device; The excitation light is reflected by a reflection region that is arranged in parallel with the fluorescent light-emitting region and has an inclined reflection surface so as to reflect the excitation light, and is emitted from the rotating wheel device through a transmission region that is arranged on the first rotating wheel. A projection method comprising:

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