JP2010197497A - Light emitting device, light source device, and projector using the light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device capable of suppressing a decrease in luminous efficiency and maintaining performance for a long period of time, a light source device constituted by the light emitting device, and a projector provided with the light source device.
A projector includes a light source device, a display element, a cooling fan, a light source side optical system that guides light from the light source device to the display element, and the display element. Three light-emitting devices each including a projection-side optical system 62 that projects an image on a screen, and a projector control unit that controls the light source device 63 and the display element 51, each of which emits light having different wavelength bands The light-emitting device 64 is composed of a cylindrically-shaped rotating body that has a phosphor layer that emits light of a predetermined wavelength band on the outer peripheral surface, and a drive source that rotates the rotating body. And an excitation light source 72 that irradiates excitation light at a predetermined position of the phosphor layer, and the rotating body is formed as a heat conducting member.
[Selection] Figure 3

Description

  The present invention relates to a light emitting device, a light source device including a plurality of light emitting devices or a single light emitting device configured to emit a plurality of types of wavelength band light, and a projector incorporating the light source device.

  2. Description of the Related Art Today, a projector as an image projection apparatus that projects a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen is widely used. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  Conventionally, projectors using a high-intensity discharge lamp as the light source have been the mainstream of such projectors, but in recent years, developments have been made to use solid-state light emitting elements such as red, green, and blue light emitting diodes and laser diodes as the light source. Furthermore, various light emitting devices using phosphors that absorb excitation light emitted from a solid light emitting element and convert it into light of a predetermined wavelength band have been developed. For example, in Japanese Patent Application Laid-Open No. 2003-295319 (Patent Document 1), laser light from a laser diode as an excitation light source is condensed and irradiated onto a phosphor, and light emitted from the phosphor is converted into parallel light by a reflector. A light source device for emitting light has been proposed. Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 2) proposes a light source device including a phosphor layer that converts ultraviolet light emitted from a light emitting diode as an excitation light source into visible light, a transparent base material, and an excitation light source. Has been made.

JP 2003-295319 A JP 2004-341105 A

  The proposal of Patent Document 1 proposes that three light emitting devices that emit light in the red, green, and blue wavelength bands receive phosphor light that is a member that emits light in a predetermined wavelength band upon receiving excitation light. The temperature of the phosphor rises without changing the irradiation position of the excitation light, and this causes a decrease in wavelength conversion efficiency caused by the temperature rise of the phosphor, There has been a problem in that the performance deteriorates.

  The proposal of Patent Document 2 can change the irradiation position of the excitation light by rotating the wheel on which the phosphor layer is arranged, and can expand the area of the irradiated phosphor layer. There is a problem in that it is necessary to form the light-transmitting material and efficient cooling cannot be performed because the thermal conductivity of the wheel itself is low.

  The present invention has been made in view of such problems of the prior art. The phosphor layer is moved to change the irradiation position of the excitation light, and the heat radiation effect is enhanced to suppress the temperature rise of the phosphor. A light-emitting device capable of suppressing a decrease in luminous efficiency and maintaining performance for a long period of time, a light source device composed of a plurality of or one light-emitting device, and the light source device It aims to provide a projector.

  The light emitting device of the present invention includes a rotation-controllable columnar rotator in which a phosphor layer that emits light of a predetermined wavelength band is disposed on an outer peripheral surface, a drive source that rotates the rotator, and the phosphor An excitation light source that irradiates excitation light at a predetermined position of the layer, and the rotating body is formed as a heat conducting member.

  In this light emitting device, a reflective layer is formed on the surface on which the phosphor layer is disposed.

  In the light emitting device, the rotating body may include a heat radiating fin.

  In the light emitting device, the drive source is a motor.

  In the light emitting device, the drive source may be a blower, and the radiating fin may be formed as a wind receiving plate.

  And this light-emitting device can also form the said rotary body as a hollow long cylindrical heat pipe.

  In the light emitting device, the rotating body is formed as a hollow long cylindrical water-cooled pipe having an end opening, and a cooler and a pump may be connected.

  Moreover, this light-emitting device can also form the said rotary body in a short cylinder shape.

  And the above-mentioned light-emitting device may be comprised as a light source device which can produce | generate multiple types of wavelength band light. In the light source device of the present invention, a plurality of types of phosphor layers emitting different wavelength band lights are arranged in the circumferential direction on the outer peripheral surface of the rotating body, and sequentially rotate the different wavelength band lights by rotating the rotating body. It is characterized by being injectable.

  The light source device emits red wavelength band light, a phosphor layer emitting green wavelength band light, and blue wavelength band light on the outer peripheral surface of the rotating body. The excitation light source can be a light emitting diode or a laser light emitter.

  In addition, the light source device has a phosphor layer emitting red wavelength band light, a phosphor layer emitting green wavelength band light, and light from the excitation light source on the outer peripheral surface of the rotating body. A diffusion layer to be diffused may be disposed, and the excitation light source may be a light emitting diode or a laser light emitter that emits blue wavelength band light.

  The light source device of the present invention includes at least three light emitting devices that emit light having different wavelength bands, and combines the optical axes of the light emitting devices with a dichroic mirror to form the same optical axis. At least one of them may be configured as the light emitting device described above.

  The light source device includes three light emitting devices in which the excitation light source is a light emitting diode or a laser light emitter. The three light emitting devices are phosphors that emit red wavelength band light to the rotating body. A light emitting device in which a layer is disposed; a light emitting device in which a phosphor layer that emits green wavelength band light is disposed on the rotating body; and a phosphor layer that emits blue wavelength band light on the rotating body. It can be configured as a light emitting device arranged.

  Further, two of the three light emitting devices constituting the light source device are a light emitting diode or a laser light emitting device in which the excitation light source emits light in a blue wavelength band, and the rotating body has a red color. A light emitting device in which a phosphor layer that emits light in a wavelength band is disposed, and a light emitting device in which a phosphor layer that emits light in a green wavelength band is disposed on the rotating body. One light-emitting device includes a rotation-controllable cylindrical rotator in which a diffusion layer for diffusing light is arranged on the outer peripheral surface, a drive source for rotating the rotator, and a blue wavelength band at a predetermined position of the diffusion layer. In some cases, the light emitting device includes a light source that emits light.

  The projector of the present invention includes a light source device, a display element, a cooling fan, a light source side optical system that guides light from the light source device to the display element, and an image emitted from the display element. And a projector control means for controlling the light source device and the display element, and the light source device is any one of the light source devices described above.

  According to the present invention, in this light emitting device, a phosphor layer that emits light of a predetermined wavelength band is arranged on a rotation body that can be controlled to rotate, and an excitation light source that irradiates excitation light to a predetermined position of the phosphor layer. When the excitation light is emitted from the excitation light source, by rotating this rotating body, the irradiation position of the excitation light in the phosphor layer is changed, and the area irradiated with the excitation light is expanded in the circumferential direction. Therefore, it is possible to suppress the temperature rise of the phosphor and to prevent the heat conduction member from locally raising the temperature, thereby suppressing the decrease in luminous efficiency and maintaining the performance over a long period of time. It is possible to provide a light-emitting device that can emit light, a light source device that includes a plurality of light-emitting devices or a single light-emitting device that can emit light of a plurality of types of wavelength bands, and a projector that includes the light source device.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. It is a figure which shows the functional circuit block of the projector which concerns on the Example of this invention. FIG. 4 is a plan view of the projector according to the embodiment of the present invention with the top plate removed. It is a top view of the light source device which concerns on the Example of this invention. It is a plane schematic diagram of the light-emitting device which made the rotary body which concerns on the Example of this invention hollow hollow cylindrical shape. It is a schematic diagram which shows the partial cross section of the light-emitting device which made the rotary body which concerns on the Example of this invention the hollow long cylindrical shape. It is a perspective view which shows the shape of the radiation fin which concerns on the Example of this invention. It is a schematic diagram which shows the partial cross section of the light-emitting device which made the rotary body which concerns on the Example of this invention the hollow long cylindrical shape. It is a schematic diagram which shows the partial cross section of the light-emitting device which made the rotary body which concerns on the Example of this invention the hollow long cylindrical shape. It is a plane schematic diagram of the light-emitting device using the water cooling pipe which concerns on the Example of this invention. It is a side surface schematic diagram of the light-emitting device which made the rotary body which concerns on the Example of this invention the short cylinder shape. It is a plane schematic diagram which shows the example of mounting of the light source device which made the rotary body which concerns on the Example of this invention the short cylinder shape. It is a side surface schematic diagram of the light-emitting device which made the rotary body which concerns on the Example of this invention the short cylinder shape. It is the plane schematic diagram and side surface schematic diagram of the light-emitting device which made the rotary body which concerns on the Example of this invention the short cylinder shape.

  A mode for carrying out the present invention will be described. The projector 10 includes a light source device 63, a display element 51, a cooling fan, a light source side optical system 61 that guides light from the light source device 63 to the display element 51, and an image emitted from the display element 51 on a screen. A projection-side optical system 62 for projecting and projector control means for controlling the light source device 63 and the display element 51 are provided.

  The light source device 63 is a light emitting device 64 capable of generating a plurality of types of wavelength bands, and a circularly controllable cylindrical shape in which a phosphor layer 131 that emits light of a predetermined wavelength band is disposed on the outer peripheral surface. A rotating body 130, a motor 73 as a driving source for rotating the rotating body 130, and a laser light emitter as an excitation light source 72 for irradiating a predetermined position of the phosphor layer 131 with a wavelength band light in the ultraviolet region as excitation light And.

  In the light emitting device 64 as the light source device 63, the rotator 130 is formed as a heat pipe as a heat conducting member having a hollow long cylindrical shape, and the rotator 130 has a capillary structure on the inner wall and has a vacuum inside. A hydraulic pipe 133 such as pure water or perfluorocarbon is sealed in a metal pipe. Further, the rotating body 130 includes a heat radiating fin in the vicinity of the end.

  In the light emitting device 64 as the light source device 63, a reflection layer is formed on the surface on which the phosphor layer 131 is disposed.

  On the outer peripheral surface of the rotating body 130, three types of phosphor layers 131 that emit light in different wavelength bands are arranged in the circumferential direction. Specifically, a red phosphor layer 131R that emits red wavelength band light, a green phosphor layer 131G that emits green wavelength band light, and a blue phosphor layer that emits blue wavelength band light Three kinds of phosphor layers 131B 131B are arranged on the outer peripheral surface of the rotating body 130.

  Accordingly, the light source device 63 (light emitting device 64) rotates the rotating body 130 by the motor 73 and irradiates the phosphor layer 131 disposed on the outer peripheral surface of the rotating body 130 with the excitation light by the excitation light source 72. Thus, red, green, and blue wavelength band light can be emitted sequentially.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a projector 10 according to one embodiment of the present invention has a substantially rectangular parallelepiped shape, and a lens cover 19 that covers a projection port on the side of a front plate 12 that is a side plate in front of a main body case. The front plate 12 is provided with a plurality of exhaust holes 17.

  The top plate 11 which is a main body case has a key / indicator unit 37. The key / indicator unit 37 includes a power switch key, a power indicator for notifying power on / off, a light source device, and the like. It is provided with keys and indicators such as an overheat indicator for notifying when overheated.

  Further, on the back of the main body case, various terminals 20 such as an input / output connector portion and a power adapter plug, etc., which are provided with a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, etc. on the back plate, a memory not shown A card slot and an Ir receiver for receiving control signals from the remote controller are provided.

  The back plate, the right side plate which is a side plate of the main body case (not shown), and the lower portion of the left side plate 15 which is the side plate shown in FIG. It is.

  As shown in FIG. 2, the projector control means of the projector 10 includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. The image signals of various standards input from the connector unit 21 are converted so as to be unified into an image signal of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). Thereafter, it is sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted 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 drive unit 26.

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. Yes, the light from the light source device 63 is incident on the display element 51 through the illumination unit that forms the light source side optical system, thereby forming a light image with the reflected light of the display element 51 and forming the projection side optical system. The movable lens group 97 of the projection side optical system is driven for zoom adjustment and focus adjustment by a lens motor 45. .

  In addition, the image compression / decompression unit 31 performs a recording process for sequentially writing a luminance signal and a color difference signal of an image signal to a memory card 32 that is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded on the memory card 32 is read, and individual image data constituting a series of moving images is expanded in units of one frame and sent to the display encoder 24 via the image conversion unit 23. A moving image or the like can be displayed based on the stored image data.

  The control unit 38 controls the operation of each circuit in the projector 10, and includes a ROM that stores operation programs such as a CPU and various settings fixedly, and a RAM that is used as a work memory. ing.

  Further, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface plate 11 of the main body case is directly sent to the control unit 38, and the key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is sent to the control unit 38.

  An audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The audio processing unit 47 includes a sound source circuit such as a PCM sound source, and converts the audio data into analog data in the projection mode and the playback mode. The speaker 48 can be driven to emit loud sounds.

  The control unit 38 controls the power supply control circuit 41. The power supply control circuit 41 turns on the light source device 63 when the power switch key is operated. Further, the control unit 38 also controls a cooling fan drive control circuit 43. The cooling fan drive control circuit 43 performs temperature detection by a plurality of temperature sensors provided in the light source device 63, etc. The rotation speed is controlled, and the rotation of the cooling fan is continued even after the light source device 63 is turned off by a timer or the like. Further, depending on the result of temperature detection by the temperature sensor, the light source device 63 is stopped and the projector main body is stopped. Control such as turning off the power is also performed.

  Further, as shown in FIG. 3, the projector 10 has an internal structure in which a power supply control circuit board 102 to which a light source power supply circuit block 101 and the like are attached is disposed in the vicinity of the right side plate 14 and the inside of the casing is divided into partition walls 120 The air intake side space chamber 121 on the back plate 13 side and the exhaust side space chamber 122 on the front plate 12 side are formed in an airtight manner, and a sirocco fan type blower 110 is arranged as a cooling fan near the center of the projector 10, The suction port 111 of the blower 110 is positioned in the space chamber 121, and the discharge port 113 of the blower 110 is positioned in the exhaust side space chamber 122.

  Further, a light source device 63 is disposed in the exhaust side space 122, and an optical unit block 77 including an illumination side block 78, an image generation block 79, and a projection side block 80 is disposed along the left side plate 15. 77. The illumination side block 78 is communicated with the exhaust side space chamber 122 so that a part of the illumination unit provided in the illumination side block 78 is located in the exhaust side space chamber 122. An exhaust temperature reducing device 114 is disposed along the face plate 12.

  The blower 110 as a cooling fan for cooling the light source device 63 and the like has a suction port 111 in the center, the discharge port 113 has a substantially square cross section, and is connected to the partition partition 120, and the partition partition 120 Exhaust air from the blower 110 is discharged into the exhaust-side space chamber 122 partitioned by the control circuit board 103 in the vicinity of the suction port 111 of the blower 110.

  The optical unit block 77 is disposed in the vicinity of the light source device 63, and includes an illumination side block 78 that includes a part of the illumination unit and emits light emitted from the light source device 63 toward the image generation block 79, and illumination. An image generation block 79 that includes a part of the display unit 51 and the display element 51 and reflects the emitted light from the illumination side block 78 to the projection side block 80 in accordance with the image data, and a projection unit of the left side plate 15 It is composed of three blocks, a projection side block 80 which is arranged in the vicinity and projects the light reflected by the image generation block 79.

  As a part of the illumination unit forming the light source side optical system 61 provided in the illumination side block 78, there is a light guide device 75 that uses light emitted from the light source device 63 as a light flux having a uniform intensity distribution.

  Further, as a part of the illumination unit forming the light source side optical system 61 included in the image generation block 79, the reflection mirror 74 that changes the direction of the light emitted from the light guide device 75, and the reflection mirror 74 reflects the light. There is a condensing lens group 83 that condenses the emitted light on the display element 51 and an irradiation mirror 84 that irradiates the display element 51 with light transmitted through the condensing lens group 83 at a predetermined angle. The image generation block 79 also includes a display element 51, and the display element 51 employs DMD. Further, a display element heat dissipation plate 53 for cooling the display element 51 is disposed on the back plate 13 side of the display element 51.

  In this DMD, a plurality of micromirrors are arranged in a matrix, and light incident from an incident direction inclined in one direction with respect to the front direction is converted into an on-state light beam in the front direction by switching the tilt direction of the plurality of micromirrors. The image is displayed by being reflected separately from the off-state light beam in the oblique direction, and the light incident on the micromirror tilted in one tilt direction is reflected in the front direction by this micromirror and turned on. The light incident on the micromirror tilted in the other tilt direction is reflected by the micromirror in an oblique direction to form an off-state light beam, and the off-state light beam is absorbed by the light absorption plate and reflected in the front direction. The image is generated by the bright display by and the dark display by reflection in the oblique direction.

  The projection-side block 80 includes a projection unit having a fixed lens group 93 and a movable lens group 97 that form a projection-side optical system 62 that irradiates a screen or the like (not shown) with a brightly displayed light beam that forms an image. Is. The lens group of these projection-side optical systems 62 is a variable-focus lens having a zoom function, and is described above by the optical system control board 86 disposed between the optical unit block 77 and the left side plate 15. The lens motor 45 is controlled to move the movable lens group 97 along the optical axis, thereby enabling zoom adjustment and focus adjustment.

  The light source device 63 according to the present invention is composed of three light emitting devices 64 that receive excitation light from the excitation light source 72 and emit light having different wavelength bands to the light guide device 75. The red light emitting device 64R that emits light in the wavelength band, the green light emitting device 64G that emits light in the green wavelength band, and the blue light emitting device 64B that emits light in the blue wavelength band.

  The red light emitting device 64R is disposed in the vicinity of the blower outlet 113 so that the optical axis of the red light emitting device 64R is orthogonal to the optical axis of the light guide device 75, and the green light emitting device 64G is The blue light emitting device 64B is disposed in the vicinity of the front plate 12 in the vicinity of the front surface plate 12 so that the optical axis of 64G is parallel to the optical axis of the red light emitting device 64R. The optical axis is arranged so as to coincide with the optical axis of the light guide device 75.

  Further, as shown in FIG. 4, the light source device 63 includes a reflection mirror 143 for guiding excitation light from the excitation light source 72 to a predetermined position of the phosphor layer 131 provided in each light emitting device 64, a condenser lens group 148, and the like. A dichroic mirror 141 having a configured excitation light source side optical system and reflecting or transmitting light in a predetermined wavelength band to combine the optical axes of the respective light emitting devices 64 into the same optical axis, and the light emitting device 64 A condensing optical system including a condensing lens that condenses the light beam emitted and incident on the light guide device 75 is provided.

  This excitation light source side optical system is arranged on the emission side of the excitation light source 72, a collimator lens 142 that makes the excitation light from the excitation light source 72 parallel light, a reflection mirror 143 that reflects the parallel light from the collimator lens 142, And a condensing lens group 148 that refracts the light reflected by the reflecting mirror 143 and irradiates the phosphor layer 131.

  The condensing optical system reflects the red wavelength band light emitted from the red light emitting device 64R so as to be in the same optical axis direction as the optical axis direction of the light guide device 75, and transmits light other than red light. The first dichroic mirror 141a and the green wavelength band light emitted from the green light emitting device 64G are reflected so as to be in the same optical axis direction as the optical axis direction of the light guide device 75, and light other than green light is transmitted. A second dichroic mirror 141b that collects, and a condensing lens group 148 that condenses the light emitted from each light emitting device 64 to enter the light guide device 75, an auxiliary condensing lens 163, and a condensing lens 164. Is.

  The first dichroic mirror 141a is arranged so that the angle formed by the optical axis is 45 degrees at the position where the optical axis of the red light emitting device 64R and the light guide device 75 intersects, and the second dichroic mirror 141b. Is arranged so that the angle formed by the optical axis at the position where the green light emitting device 64G and the optical axis of the light guide device 75 intersect is 45 degrees.

  Further, the first condenser lens group 148a that condenses the light emitted from the red light emitting device 64R has a red light emitting device so that the optical axis of the first condenser lens group 148a coincides with the optical axis of the red light emitting device 64R. The second condenser lens group 148b, which is disposed between the 64R and the first dichroic mirror 141a and condenses the light emitted from the green light emitting device 64G, has an optical axis of the second condenser lens group 148b. A third condenser lens group 148c, which is disposed between the green light emitting device 64G and the second dichroic mirror 141b so as to coincide with the optical axis of 64G and collects the emitted light from the blue light emitting device 64B, The condenser lens group 148c is disposed between the blue light emitting device 64B and the second dichroic mirror 141b so that the optical axis of the condensing lens group 148c coincides with the optical axis of the blue light emitting device 64B.

  The first auxiliary condenser lens 163a that condenses the red light incident on the first dichroic mirror 141a via the first condenser lens group 148a is such that the optical axis of the first auxiliary condenser lens 163a is a red light emitting device. It is arranged between the first condenser lens group 148a and the first dichroic mirror 141a so as to coincide with the optical axis of 64R, and condenses the light incident on the first dichroic mirror 141a via the second dichroic mirror 141b. The second auxiliary condenser lens 163b is disposed between the first dichroic mirror 141a and the second dichroic mirror 141b so that the optical axis of the second auxiliary condenser lens 163b coincides with the optical axis of the light guide device 75. Is. Further, the condenser lens 164 that condenses the light incident on the light guide device 75 via the first dichroic mirror 141a is arranged so that the optical axis of the condenser lens 164 coincides with the optical axis of the light guide device 75. It is arranged between the one dichroic mirror 141a and the light guide device 75.

  As shown in FIG. 5, each light-emitting device 64 includes a cylindrical rotating body 130 made of copper having high thermal conductivity, and a drive source that is attached to the end of the rotating body 130 and rotates the rotating body 130. As the motor 73, an annular heat dissipating fin 136 suspended outward from the rotating body 130, and an excitation light source 72 for irradiating excitation light to a predetermined position of the phosphor layer 131 included in the rotating body 130. When the excitation light from the excitation light source 72 that is time-division controlled by the projector control means is sequentially applied to the rotating body 130 of each light emitting device 64, it is contained in the phosphor layer 131 disposed on the rotating body 130. Then, a predetermined wavelength band light is generated from the phosphor, and each color light sequentially emitted from each light emitting device 64 enters the light guide device 75 through the above-described condensing optical system.

  That is, as shown in FIG. 4, the red light emitted from the red light emitting device 64R is condensed by the first condenser lens group 148a and irradiated to the first auxiliary condenser lens 163a, and the first auxiliary condenser is collected. After the light condensed by the lens 163a is reflected by the first dichroic mirror 141a, it is condensed by the condensing lens 164 on the incident surface of the light guide device 75.

  Further, the green light emitted from the green light emitting device 64G is collected by the second condenser lens group 148b, enters the second dichroic mirror 141b, is reflected by the second dichroic mirror 141b, and then the second auxiliary condenser. The light is condensed by the lens 163b, irradiated to the first dichroic mirror 141a, transmitted through the first dichroic mirror 141a, and then condensed by the condenser lens 164 on the incident surface of the light guide device 75.

  Then, the blue light emitted from the blue light emitting device 64B is condensed by the third condenser lens group 148c, irradiated to the second dichroic mirror 141b, transmitted through the second dichroic mirror 141b, and then the second auxiliary condenser. The light is condensed by the lens 163b, irradiated to the first dichroic mirror 141a, transmitted through the first dichroic mirror 141a, and then condensed by the condenser lens 164 on the incident surface of the light guide device 75.

  As shown in FIGS. 5 and 6, the rotating body 130 has a hollow long cylindrical shape, and has a capillary structure on the inner wall, and a working liquid 133 such as pure water or perfluorocarbon is sealed in a vacuum state. It is formed as a heat pipe as a heat conducting member. The rotating body 130 includes a motor 73 as a drive source at the end. Therefore, the rotating body 130 can be controlled to rotate by the motor 73 that is driven and controlled by the control unit 38 of the projector control means.

  In the rotating body 130, a phosphor layer 131 is disposed on the outer peripheral surface in the vicinity of the end opposite to the end to which the motor 73 is attached. Each phosphor layer 131 receives excitation light emitted from the excitation light source 72 and emits light in a predetermined wavelength band, and is composed of a phosphor crystal and a binder. That is, in the light emitting device 64, since the phosphor layer 131 is disposed on a plane parallel to the rotation axis of the rotator 130, rotating the rotator 130 moves the phosphor layer 131 in the circumferential direction. Thus, the irradiation position of the excitation light in the phosphor layer 131 can be changed.

  As described above, if the phosphor layer 131 that generates monochromatic light is arranged on the rotating body 130 of each light emitting device 64, the excitation light irradiation position on the phosphor layer 131 can be rotated in the phosphor layer 131 even in the small projector 10. Since the area irradiated with the excitation light can be expanded in the circumferential direction, the temperature rise can be effectively suppressed.

  As shown in FIG. 6A, a red phosphor layer 131R that emits red wavelength band light, which is the primary color, is fixed to the outer peripheral surface of the rotating body 130 of the red light emitting device 64R. As shown in FIG. 6 (b), a green phosphor layer 131G that emits green wavelength band light, which is the primary color, is fixed to the rotating body 130 of the green light emitting device 64G, as shown in FIG. 6 (c). In addition, a blue phosphor layer 131 that emits blue wavelength band light, which is the primary color, is fixed to the rotating body 130 of the blue light emitting device 64B.

  As shown in FIG. 6, in this rotating body 130, a reflection layer 134 that reflects excitation light and wavelength band light emitted from the phosphor is formed by coating on the surface on which the phosphor layer 131 is disposed. A phosphor layer 131 is formed on the reflective layer 134. The reflective layer 134 may be formed by finishing the member of the rotator 130 to a mirror surface using metal or by performing silver vapor deposition or the like.

  As shown in FIG. 5, the excitation light source 72 irradiates a predetermined position of the phosphor layer 131 disposed on the outer peripheral surface of the rotator 130 with the excitation light. The light emitting diode or laser emitter emits ultraviolet wavelength band light, which is invisible light having a shorter wavelength than red, green, and blue wavelength band light emitted from the green and blue phosphor layers 131.

  It should be noted that the excitation light sources 72 are not limited to all having the same specification, and the excitation light sources 72 may be any one that can emit excitation light that generates light of a predetermined wavelength band from each phosphor. For example, the red and green light emitting devices 64R and 64G may employ an excitation light source 72 capable of emitting blue or violet wavelength band light having a shorter wavelength than the red and green wavelength bands as excitation light. Further, the blue light emitting device 64B may employ an excitation light source 72 capable of emitting purple wavelength band light having a shorter wavelength than the blue wavelength band as excitation light. Furthermore, a plurality of types of excitation light sources 72 may be arranged in a single light-emitting device 64 and used by switching according to the situation.

  Next, light emitted from the light emitting device 64 and incident on the light guide device 75 will be described. When excitation light is irradiated from the excitation light source 72 to the outer peripheral surface of the rotating body 130 of the light emitting device 64, the excitation light is first irradiated to the phosphor layer 131 of the rotating body 130 as shown in FIG. . The phosphor of the phosphor layer 131 absorbs the excitation light and emits light of a predetermined wavelength band in all directions. That is, red wavelength band light is emitted from the phosphor of the red phosphor layer 131R of the red light emitting device 64R, green wavelength band light is emitted from the green phosphor layer 131G of the green light emitting device 64G, and blue light is emitted. Blue wavelength band light is emitted from the blue phosphor layer 131B of the device 64B.

  Then, as shown in FIG. 4, the light emitted from the phosphor and incident on the condenser lens group 148 enters the light guide device 75 via the condenser optical system. In addition, as shown in FIG. 6, the excitation light that has passed through the phosphor layer 131 and is emitted to the rotating body 130 is reflected by the reflection layer 134, and is again absorbed by the phosphor layer 131. The light generated and emitted to the rotating body 130 side is also reflected by the reflective layer 134, so that the light emitting device 64 can emit light effectively and light, and a large amount of light can enter the light guide device 75.

  As shown in FIG. 4, the light guide device 75 in the present embodiment is a tapered light tunnel formed in a hollow, substantially quadrangular pyramid shape. This tapered light tunnel has four trapezoidal plates that form the top, bottom, left, and right surfaces with an entrance surface and an exit surface perpendicular to the optical axis, and by bonding and fixing each in the vicinity of the ridgeline of each plate It is formed in a substantially quadrangular frustum shape whose cross-sectional area expands from the entrance surface to the exit surface, and the inner surface is a reflection surface. In addition, by making the vertical and horizontal lengths of the exit surface approximately twice the vertical and horizontal lengths of the entrance surface of this tapered light tunnel, the incident diffused light is transferred from the exit surface to the optical axis. On the other hand, it can be set as a light beam having a spread of about 30 degrees.

  The light guide device 75 is not a tapered light tunnel, but the length of the entrance surface and the exit surface are the same length and the length of the width is the same, and a condenser lens group is arranged on the entrance surface side of the light tunnel. The diffused light emitted from the light emitting device 64 may be condensed by the condenser lens group and incident on the light tunnel. The light guide device 75 is not limited to the light tunnel, and a solid glass rod may be used.

  Thus, in the light emitting device 64, the phosphor layer 131 that emits light in a predetermined wavelength band is disposed on the rotation body 130 that can be rotated, and the excitation light is irradiated to a predetermined position of the phosphor layer 131. When the excitation light source 72 is provided and the excitation light is emitted from the excitation light source 72, the rotating body 130 is rotated to change the irradiation position of the excitation light in the phosphor layer 131 so that the area irradiated with the excitation light is circular. By expanding in the circumferential direction, it is possible to suppress the temperature rise of the phosphor, and it is possible to prevent a local increase in temperature by the heat conducting member. Thus, it is possible to provide the light emitting device 64 capable of maintaining the performance, the light source device 63 including the plurality of light emitting devices 64, and the projector 10 including the light source device 63.

  The projector 10 includes three light emitting devices 64R, 64G, and 64B that can emit light in the wavelength bands of red, green, and blue as the light source device 63 built in the projector 10. When the excitation light emitted from the excitation light source 72 of each light emitting device 64 is sequentially blinked, red, green, and blue wavelength band light is guided from the phosphor layer 131 of each rotary body 130 to the light guide device. In order to generate a color image on the screen, the DMD which is sequentially incident on 75 and displays the light of each color according to the data according to the data, in accordance with the irradiation timing of each excitation light source 72. it can.

  Each light-emitting device 64 is not limited to being configured to sequentially blink by the projector control means, but may combine each color light and irradiate the light guide device 75. For example, if each color light is simultaneously emitted from the red, green, and blue light emitting devices 64R, 64G, and 64B, the light guide device 75 is irradiated with white light formed by combining the respective color lights, thereby improving the luminance. it can. Furthermore, it is also possible to easily adjust the hue such as the color composition by changing the lighting time ratio of red, green, and blue to increase the lighting time of a low-luminance color.

  In addition, the rotating body 130 is formed as a heat pipe that is a heat conducting member, and the heat radiation fin 136 made of the heat conducting member is provided in the vicinity of the motor 73 so as not to block the light emission from the phosphor. By dissipating heat from the body layer 131 in the longitudinal direction of the rotating body 130 formed of a heat pipe and radiating heat from the radiating fins 136, heat can be radiated efficiently. Then, by disposing the wind from the cooling fan so as to hit the heat radiating fins 136, heat can be effectively radiated. The rotating body 130 uses a heat pipe made of a copper pipe as a heat conducting member. However, the rotating body 130 is not limited to this. For example, the rotating body 130 is made of aluminum, a glass material having a high thermal conductivity, or a solid material made of a resin material. It can be formed as various heat conducting members such as a cylindrical shape.

  Since the reflecting layer 134 is formed on the surface of the rotating body 130 on which the phosphor layer 131 is disposed, the light emitted to the rotating body 130 side is reflected to the light guide device 75 side to reflect the light guide device. The amount of light incident on 75 can be increased.

  Furthermore, by using the motor 73 as the drive source of the rotator 130, the rotation control of the rotator 130 can be easily performed. The motor 73 can also be connected to the rotating body 130 via a gear train or a belt without being connected to the end of the rotating body 130. Further, the drive source is not limited to the motor 73, and various drive sources can be employed.

  For example, by providing the drive source as a blower and forming the heat radiating fins 136 as wind receiving plates as shown in FIG. 7, the rotating body 130 can be rotated by blowing air from the blower. Further, since the motor 73 is not required to be installed by using the blower as a drive source, it is possible to reduce the size and the cost. Furthermore, if this air blower is used as a cooling fan for the projector 10 and an air passage that guides the wind from the cooling fan to the heat radiation fin 136 is formed, the rotating body 130 can be rotated by the air blowing from the cooling fan without newly installing the air blower.

  Further, by adopting a light emitting diode or laser light emitter as the excitation light source 72, power consumption can be suppressed and miniaturization can be achieved as compared with a projector using a conventional discharge lamp or the like as a light source device.

  Further, the light emitting device 64 is not limited to the case where the light emitting device 64 is composed of the three light emitting devices 64 that generate red, green, and blue wavelength bands, which are primary colors, and various combinations can be employed. For example, a light emitting device 64 that generates complementary wavelength band light such as yellow may be further incorporated into the light source device 63. Thereby, the luminance of the light source device 63 can be increased to improve the color reproducibility.

  Further, as shown in FIG. 8, irradiation is performed without arranging the phosphor layer 131 on the outer peripheral surface of the rotating body 130 of the predetermined light-emitting device 64 among the plurality of light-emitting devices 64 constituting the light source device 63. In some cases, an optical substance that imparts a diffusion effect to the light in the wavelength band is disposed as the diffusion layer 135. Specifically, the light source device 63 includes three light emitting devices 64, and the two light emitting devices 64 are a red light emitting device 64R and a green light emitting device 64G each including an excitation light source 72, and one light emitting device 64. Is a blue light emitting device 64B that includes a light source 70 that emits light in the blue wavelength band and has a diffusion layer 135 disposed on the outer peripheral surface.

  That is, as shown in FIG. 8C, the blue light emitting device 64B uses a light source 70 arranged in the same manner as the excitation light source 72 described above as a light emitting diode or a laser light emitter that emits blue wavelength band light. The blue light from the light source 70 is diffused by the diffusion layer 135 to emit light, and this light can be used as it is.

  Note that the diffusion layer 135 may be formed by applying an optical process such as a roughing process such as blasting to the surface of the rotating body 130 in addition to fixing a solid material which is an optical substance. The rotating body 130 on which the diffusion layer 135 is arranged may have the same configuration as the rotating body 130 shown in FIG. In addition, when the light transmittance of the blue light of the diffusion layer 135 is very high and the light diffusing material does not increase in temperature so that it does not require cooling when diffusing and emitting the blue light source light, the rotating body 130 is The heat pipe function may not be provided, and a rotating cylindrical body may be configured.

  Further, when blue wavelength band light from the light source 70 is irradiated to a predetermined position of the diffusion layer 135, the diffusion layer 135 emits the light incident on the diffusion layer 135 as diffusion light. Therefore, in the rotator 130 in which the diffusion layer 135 is formed in this way, the light from the light source 70 enters the light guide device 75 through the condensing optical system as the diffused blue diffused light.

  In this way, the light emitted from the light source 70 is diffused, and the light-emitting device 64 can also be used as a single monochromatic light source. Therefore, the installation area of the relatively expensive phosphor layer 131 can be reduced. The inexpensive light source device 63 and the projector 10 including the light source device 63 can be provided.

  The light source device 63 includes the excitation light source 72 that uses blue light as excitation light, the red light emitting device 64R in which the red phosphor layer 131R is disposed on the rotating body 130, and the green phosphor layer 131G on the rotating body 130. The green light emitting device 64G disposed and the light source 70 having the same specifications as the excitation light sources 72 provided in the red and green light emitting devices 64R and 64G are provided, and a diffusion layer 135 that imparts a diffusion effect to the rotating body 130 is formed. By constructing the blue light emitting device 64B, as described above, red, green and blue wavelength band lights are sequentially generated from each light emitting device 64 and incident on a DMD or the like to project a color image on the screen. In addition, it is possible to provide the light source device 63 and the projector 10 that can suppress the decrease in the light emission efficiency of each light emitting device 64 and can maintain the performance for a long period of time.

  The blue light emitting device 64B uses the light source 70 that emits light in the blue wavelength band, but the red and green light emitting devices 64R and 64G do not use the blue light source 70 as the excitation light source 72, and each has a different wavelength band light. It is also possible to provide an excitation light source 72 that emits. For example, the red light emitting device 64R may be provided with an excitation light source 72 that emits ultraviolet light, and the green light emitting device 64G may be provided with an excitation light source 72 that emits purple wavelength band light.

  The light emitting device 64 may be configured as a light source device 63 that can generate a plurality of types of wavelength band light by a single light emitting device 64, as shown in FIG. Specifically, as shown in FIG. 9A, the light-emitting device 64 as the light source device 63 is red as a plurality of types of phosphor layers 131 that emit light in different wavelength bands on the outer peripheral surface of the rotating body 130. A red phosphor layer 131R that emits light in the wavelength band of light, a green phosphor layer 131G that emits light in the green wavelength band, and a blue phosphor layer 131B that emits light in the blue wavelength band are arranged in the circumferential direction, By rotating the rotating body 130, red, green and blue wavelength band lights can be sequentially emitted as different wavelength band lights.

  In addition, the excitation light source 72 is a light emitting diode or laser light emitter that emits light in the blue wavelength band, and instead of the blue phosphor layer 131B shown in FIG. 9A, as shown in FIG. 9B. If the diffusion layer 135 that diffuses the light from the excitation light source 72 is disposed in the diffusion layer 135, the excitation light source 72 is used as the light source 70, and the blue wavelength band light from the excitation light source 72 (70) is diffused and emitted as it is. The red and green phosphor layers 131R and 131G can emit light converted into red and green wavelength band light.

  In this way, by configuring the light source device 63 that can generate a plurality of types of wavelength band light by the light emitting device 64 alone, different wavelength band lights such as red, green, and blue are sequentially emitted, and this emission timing By controlling the DMD in accordance with the color image, it is possible to project a color image on the screen. In addition, since the number of light emitting devices 64 can be determined in consideration of the arrangement space of the light emitting devices 64, the arrangement space of the light source devices 63 can be made compact. For example, the projector 10 can include only one light emitting device 64 capable of emitting three primary colors, and includes a light emitting device 64 capable of emitting two kinds of primary colors and a light emitting device 64 capable of emitting one kind of primary colors. You can also have one by one.

  Further, as shown in FIG. 10, the light emitting device 64 is formed as a hollow long cylindrical water-cooled pipe having a rotating body 130 having an opening at the end, and the rotating body 130 uses water as a refrigerant in the water-cooled pipe. The cooling device may be configured to be rotatably connected via a cooler for cooling, a pump for circulating water, and a connecting pipe fixed by the cooler or the pump. The cooler is, for example, an air-cooled radiator (heat radiator), and is configured to be able to cool the refrigerant by blowing air from a cooling fan of the projector 10.

  As described above, the light emitting device 64 includes the excitation light source 72 and the phosphor layer 131 is disposed on the outer peripheral surface of the rotating body 130. A motor is connected to the rotating body 130 via a gear train (not shown), and the rotation of the rotating body 130 is controlled by controlling the motor. The rotating body 130 may be rotated by a motor via a belt without using a gear train, or a blade is provided inside the rotating body 130 as a water-cooled pipe and rotated by a water flow. A configuration may be adopted.

  In this way, by configuring a system in which water that has passed through the rotating body 130 is cooled by a cooler, and the cooled coolant water is circulated by a pump and led to the rotating body 130, the phosphor is more efficiently produced. Therefore, the light emitting device 64, the light source device 63, and the light source device 63 capable of suppressing the decrease in the light emission efficiency of each light emitting device 64 and maintaining the performance over a longer period of time can be obtained. The projector 10 provided can be provided. Note that the refrigerant is not limited to water.

  The light emitting device 64 employs an O-ring 137 in the watertight structure of the water cooling pipe. The O-ring 137 is installed in a groove formed at the end of the connecting pipe in close contact with the inner peripheral surface of the groove and the outer peripheral surface of the end of the rotating body 130. Thereby, even when the rotating body 130 rotates, it is possible to reliably prevent water leakage from the bearing portion, which is a connecting portion between the rotating body 130 as a water-cooled pipe and the connecting pipe.

  Further, in the light emitting device 64, as shown in FIG. 11, the rotating body 130 can be formed in a solid short cylindrical shape made of a heat conducting member such as copper. Thus, by making the diameter larger than the height (thickness) of the rotating body 130, the area of the outer peripheral surface on which the phosphor layer 131 is disposed can be made larger. Accordingly, since the heat concentration on the phosphor can be reduced, the light emitting device 64 and the light source device 63 capable of maintaining the performance for a longer period of time and the projector 10 including the light source device 63 are provided. be able to.

  Further, the heat conducting member is not limited to copper, but can be a disk made of various materials such as aluminum and resin material, and the rotating body 130 is formed in a hollow short cylindrical shape to form an internal structure. Alternatively, a vapor chamber filled with a working fluid may be formed.

  The light emitting device 64 is configured by the light emitting device 64 because the height of the cylinder can be shortened to maintain the product thickness even when the arrangement area of the phosphor layer 131 is increased. The projector 10 on which the light source device 63 is mounted can be made compact. For example, FIG. 12 shows an example in which the light emitting device 64 configured as the light source device 63 with the three primary color phosphor layers 131 arranged on the outer peripheral surface of the light emitting device 64 is mounted on the projector 10 shown in FIG. 12A is a diagram showing an arrangement configuration when the rotation axis of the rotating body 130 is in the vertical direction, and FIG. 12B is an arrangement configuration when the rotation axis of the rotating body 130 is in the horizontal direction. FIG. That is, as shown in FIG. 12 (a), if the rotating shaft of the rotating body 130 is mounted on the projector 10 in the vertical direction, the light emitting device 64 does not increase in the height direction of the projector 10, so that the phosphor easily The arrangement area of the layer 131 can be increased.

  When mounted on a vertically long projector 10, as shown in FIG. 12B, the thickness of the product width is changed by arranging the light emitting device 64 with the rotation axis of the rotating body 130 in the horizontal direction. Therefore, the arrangement area of the phosphor layer 131 can be increased. Therefore, since the light emitting device 64 can adopt various arrangement modes, the design freedom of the projector 10 can be improved.

  Further, the light emitting device 64 can include the heat radiation fins 136 to improve the cooling efficiency. Various shapes can be adopted for the shape and arrangement of the heat dissipating fins 136. For example, as shown in FIG. 13, the radiating fins 136 formed in a thin ring shape may be suspended from the end face of the cylinder.

  Further, as shown in FIG. 14, the rotating body 130 is formed in a ring shape that is a hollow short cylindrical shape having an end portion as an opening, and the radiating fins 136 are vertically provided so as to protrude inward from the inner peripheral surface. Sometimes. Thus, the heat transfer area can be increased by providing a large number of heat dissipating fins 136 on the inner peripheral surface. Furthermore, since the heat dissipating fins 136 can be arranged in the vicinity of the phosphor layer 131, the heat of the phosphor can be efficiently dissipated, and the rotating body 130 has a hollow shape with an opening at the end. Heat is not trapped inside the disk like a real disk.

  Note that if the heat radiating fin 136 is formed as a wind receiving plate, a light emitting device 64 that can be driven by a blower can be configured. Further, if the heat dissipating fins 136 are formed as blades, a wind flow can be generated by the rotation of the rotating body 130 by the motor 73. Accordingly, it is possible to improve the cooling efficiency by continuously applying wind to the rotating body 130 and to use the light emitting device 64 as a cooling fan.

  In the above embodiment, the light emitting device 64 is incorporated in the projector 10. However, the light emitting device 64 is not limited to being mounted on the projector, and can be used by being mounted on various devices such as an exposure apparatus. And it is not limited to using red, green and blue in combination, but a light emitting device 64 that emits a single color is incorporated in the lighting device, and an illumination lighting device composed of a large number of single color light emitting devices 64 or a monochromatic light device. You may use as an illuminating device which can irradiate a spotlight, an illuminating device as a backlight of a liquid crystal panel, etc.

  And this invention is not limited to the above Example, A change and improvement are possible freely in the range which does not deviate from the summary of invention.

10 Projector 11 Top plate
12 Front plate 13 Back plate
14 Right side plate 15 Left side plate
17 Exhaust hole 18 Intake hole
19 Lens cover 20 Various terminals
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Power supply control circuit 43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 51 Display element
53 Display element heat sink 61 Light source side optical system
62 Projection-side optical system 63 Light source device
64 Light emitting device 64R Red light emitting device
64G Green light emitting device 64B Blue light emitting device
70 Light source 72 Excitation light source
73 Motor 74 Reflection mirror
75 Light guide device 77 Optical unit block
78 Lighting block 79 Image generation block
80 Projection side block 83 Condensing lens group
84 Irradiation mirror 86 Optical system control board
93 Fixed lens group 97 Movable lens group
101 Power supply circuit block for light source 102 Power supply control circuit board
103 Control circuit board 110 Blower
111 Suction port 113 Discharge port
114 Exhaust temperature reduction device 120 Partition wall
121 Inlet side space 122 Exhaust side space
130 Rotating body 131 Phosphor layer
131R red phosphor layer 131G green phosphor layer
131B Blue phosphor layer 133 Hydraulic fluid
134 Reflective layer 135 Diffusion layer
136 Radiation fin 137 O-ring
141 dichroic mirror 141a first dichroic mirror
141b Second dichroic mirror 142 Collimator lens
143 Reflective mirror 148 Condensing lens group
148a First condenser lens group 148b Second condenser lens group
148c Third condenser lens group 163 Auxiliary condenser lens
163a First auxiliary condenser lens 163b Second auxiliary condenser lens
164 Condensing lens

Claims (15)

A columnar rotating body capable of rotation control, in which a phosphor layer emitting light of a predetermined wavelength band is disposed on the outer peripheral surface;
A drive source for rotating the rotating body;
An excitation light source that irradiates excitation light to a predetermined position of the phosphor layer, and
The light emitting device, wherein the rotating body is formed as a heat conductive member.   The light emitting device according to claim 1, wherein a reflective layer is formed on a surface on which the phosphor layer is disposed.   The light emitting device according to claim 1, wherein the rotating body includes a heat radiating fin.   4. The light emitting device according to claim 1, wherein the driving source is a motor.   The light emitting device according to claim 3, wherein the driving source is a blower, and the heat radiating fins are formed as wind receiving plates.   The light-emitting device according to claim 1, wherein the rotating body is formed as a hollow long cylindrical heat pipe.   6. The light emitting device according to claim 1, wherein the rotating body is formed as a hollow long cylindrical water-cooled pipe having an opening at an end, and a cooler and a pump are connected to the rotating body. apparatus.   The light emitting device according to claim 1, wherein the rotating body is formed in a short cylindrical shape.   The light-emitting device according to any one of claims 1 to 8 is configured as a light source device capable of generating a plurality of types of wavelength band light, and a plurality of types of light emitting different wavelength band lights on the outer peripheral surface of the rotating body. A light source device, wherein phosphor layers are arranged in a circumferential direction, and are configured to sequentially emit different wavelength band light by rotating the rotating body.   A phosphor layer emitting red wavelength band light, a phosphor layer emitting green wavelength band light, and a phosphor layer emitting blue wavelength band light are arranged on the outer peripheral surface of the rotating body. The light source device according to claim 9, wherein the excitation light source is a light emitting diode or a laser light emitter.   A phosphor layer that emits red wavelength band light, a phosphor layer that emits green wavelength band light, and a diffusion layer that diffuses light from the excitation light source are disposed on the outer peripheral surface of the rotating body. The light source device according to claim 9, wherein the excitation light source is a light emitting diode or a laser light emitter that emits light in a blue wavelength band.   It has at least three light-emitting devices each emitting light having a different wavelength band, and the optical axes of the light-emitting devices are combined by a dichroic mirror so as to have the same optical axis, and at least one of the light-emitting devices is claimed. A light source device according to claim 8, wherein the light source device is a light emitting device according to claim 8.   A light emitting device comprising three light emitting devices in which the excitation light source is a light emitting diode or a laser light emitter, wherein the three light emitting devices are arranged with a phosphor layer emitting red wavelength band light on the rotating body. And a light emitting device in which a phosphor layer emitting green wavelength band light is disposed on the rotating body, and a light emitting device in which a phosphor layer emitting blue wavelength band light is disposed on the rotating body. The light source device according to claim 12, wherein the light source device is a light source device.   Two of the three light-emitting devices are a light-emitting diode or a laser light emitter in which the excitation light source emits blue wavelength band light, and a phosphor that emits red wavelength band light to the rotating body. And a light emitting device in which a phosphor layer that emits green wavelength band light is disposed on the rotating body, and one of the three light emitting devices is a light emitting device. A cylindrically-shaped rotating body with a diffusion controllable diffusion layer disposed on the outer peripheral surface, a driving source for rotating the rotating body, and a light source for irradiating blue wavelength band light at a predetermined position of the diffusion layer The light source device according to claim 12, wherein the light source device is a light emitting device. A light source device, a display element, a cooling fan, a light source side optical system that guides light from the light source device to the display element, and a projection side optical system that projects an image emitted from the display element onto a screen; A projector control means for controlling the light source device and the display element,
The projector according to claim 9, wherein the light source device is the light source device according to claim 9.

Images