JP5516709B2 - Light source device and projector - Google Patents

Description

  The present invention relates to a light source device 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.

  In the past, projectors using a high-intensity discharge lamp as the light source have been the mainstream, but in recent years, development has been made to use solid-state light emitting elements such as red, green, and blue light emitting diodes and organic EL as the light source. Many proposals have been made. For example, Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 1) proposes a light source device including a phosphor layer that converts ultraviolet light emitted from a solid light source into visible light, a transparent substrate, and a solid light source. .

JP 2004-341105 A

  In the proposal of Patent Document 1, in consideration of characteristics of phosphors of different types, the wavelength band light of each color emitted from the light source device obtains a predetermined light emission amount, so that the excitation light of one type of wavelength band is characterized. Since the phosphor layers irradiate different layers, there is a problem in that the light emission efficiency of the light source device is low and it is difficult to save power. Further, there are cases where the output of the light source body of excitation light is insufficient, and there is a problem that increasing the number of light source bodies in order to obtain a predetermined luminance increases power consumption and heat generation.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a light source device that has high luminous efficiency and can save power, and a projector including the light source device. It is said.

The light source device of the present invention includes two or more light source bodies that emit excitation light of a predetermined wavelength band, and can emit at least two different wavelength band lights, and two or more phosphors. A substrate on which a layer is disposed, and the excitation light source is configured so that excitation light of each predetermined wavelength band of the light source body irradiates excitation light on the corresponding phosphor layer of the substrate. It is to be controlled.
An auxiliary base material is disposed on the side of the base material opposite to the side on which the excitation light source is disposed, the auxiliary base material reflects the excitation light on the surface on the base material side, and a phosphor. The excitation light reflecting layer that transmits the wavelength band light emitted from is formed corresponding to each segment region of the substrate.
In addition, the light source device of the present invention includes two or more light source bodies that emit excitation light of a predetermined wavelength band and can emit at least two different wavelength band lights, and two or more types of fluorescence. A substrate on which a body layer is disposed, and an auxiliary substrate disposed on a side of the substrate opposite to the side on which the excitation light source is disposed, and each of the light source bodies includes the excitation light source. Wavelength band light that is controlled so as to irradiate the corresponding phosphor layer of the base material with excitation light, the auxiliary base material reflects the excitation light on the surface on the base material side, and the phosphor emits light The excitation light reflecting layer that transmits the light is formed corresponding to each segment region of the substrate.

  The base material has a dichroic layer that transmits the excitation light and reflects the wavelength band light emitted from the phosphor on the surface on which the phosphor layer is disposed. is there.

The base material may have a non-reflective coating layer on the surface opposite to the side where the phosphor layer is disposed .

Also, the auxiliary base is the side on which the substrate is disposed on the opposite side, it is desirable to have a non-reflection coating layer.

Moreover, the said base material is formed with a glass base material or a transparent resin base material.
The base material may be formed of a heat transfer member, and a reflective layer may be formed on the surface on which the phosphor layer is disposed.

  At least one of the plurality of light source bodies emits blue wavelength band light, and the other light source bodies emit ultraviolet wavelength band light.

  The base material includes a segment region in which a phosphor layer emitting red wavelength band light is disposed, a segment region in which a phosphor layer emitting green wavelength band light is disposed, and a blue wavelength A segment region in which a phosphor layer that emits band light is disposed, and at least one of the light source bodies is a phosphor that emits blue wavelength band light and red and green wavelength band light. The layer is irradiated, and at least one of the light source bodies irradiates the phosphor layer emitting the blue wavelength band light with the wavelength band light in the ultraviolet region.

  The projector of the present invention includes a light source device, a display element, a light source side optical system that guides light from the light source device to the display element, and a projection that projects an image emitted from the display element onto a screen. And a projector control means for controlling the light source device and the display element, and the light source device is the light source device described above.

  According to the present invention, it is possible to provide a light source device that has high light emission efficiency and can save power, and a projector including the light source device.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. FIG. 3 is a diagram illustrating a functional circuit block of the projector according to the embodiment of the invention. FIG. 2 is a plan view of the projector according to the embodiment of the present invention with the top plate removed. The perspective view which shows the external appearance of the light source device which concerns on the Example of this invention. The front sectional view of the light source device concerning the example of the present invention. The top view of the light source device which concerns on the Example of this invention. The front sectional view of the light source device concerning the example of the present invention. The front sectional view of the light source device concerning the example of the present invention. The front sectional view of the light source device concerning the example of the present invention.

  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 an 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.

  Furthermore, on the back of the main body case, various terminals 20 such as an input / output connector section and a power adapter plug that provide 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 side 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 image signals of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). 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.

  The display drive unit 26 to which the video signal is input from the display encoder 24 drives the 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 forming 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 the 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 into a memory card 32 which is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded in the memory card 32 is read out, 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 is composed of a ROM in which operation programs such as a CPU and various settings are fixedly stored, a RAM used as a work memory, and the like. 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 in the projection mode and the reproduction mode. The speaker 48 can be driven to emit loud sounds.

  The control unit 38 controls a 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 and the like, and thereby controls the cooling fan. 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.

  As shown in FIG. 3, the projector 10 has an internal structure in which a power supply control circuit board 102 with a light source power supply circuit block 101 and the like mounted thereon is disposed in the vicinity of the right side plate 14, and the inside of the casing is divided into partition walls 120. Thus, the 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 airtight, and a sirocco fan type blower 110 is disposed as a cooling fan in the vicinity of 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, the light source device 63 is arranged in the exhaust side space chamber 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 arranged 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 at the center, and 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 the emitted light from the light source device 63 toward the image generation block 79. An image generation block 79 that includes a part of the display unit 51 and the display element 51 and reflects the light emitted from the illumination side block 78 toward the projection side block 80 according to the image data, and a projection unit that includes 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 beam 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 a 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 light beam of bright display that forms an image. Is. The lens group of these projection side optical systems 62 is a variable focus type lens having a zoom function, and has been 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 includes two or more light source bodies 72 that emit excitation light of a predetermined wavelength band, and can emit at least two different wavelength band lights. The fluorescent wheel 71 is configured to receive the excitation light of each color and emit the wavelength band light of each color to the light guide device 75. The fluorescent wheel 71 is formed at the center of the base material 130 made of a disc-shaped transparent material. A wheel motor 73 that is attached and driven and controlled by the control unit 38 of the projector control means is rotatably arranged.

  As shown in FIGS. 4 to 6, the light source device 63 includes a rotating plate having a plurality of segment regions in which a phosphor layer 131 that receives excitation light and emits light in a predetermined wavelength band is disposed, and the rotation plate. An excitation light source 70 composed of a fluorescent wheel 71 composed of a wheel motor 73 that rotates a plate and a plurality of light source bodies 72 that irradiate the phosphor contained in the phosphor layer 131 with excitation light; When excitation light is irradiated onto the fluorescent wheel 71 from the excitation light source 70, light of a predetermined wavelength band is emitted from the phosphor of the phosphor layer 131, and the emitted light is incident on the light guide device 75. Is.

  The fluorescent wheel 71 is composed of a rotary plate having a phosphor layer 131 on a circular base material 130 and a wheel motor 73, and a circle serving as a connection portion with the wheel motor 73 at the center of the base material 130. A circular opening corresponding to the shape of the columnar rotor is formed, and the rotor is inserted into the circular opening to be integrated. Thereby, the rotating plate of the fluorescent wheel 71 is rotated by the wheel motor 73 that is driven and controlled by the control unit 38 of the projector control means at a rotation speed of about 120 times per second.

  Further, the three segment regions of the rotating plate are formed in a fan shape, and the substrate 130 of the rotating plate is formed of a glass substrate or a transparent resin substrate. In each segment region of the base material 130, a phosphor layer 131 is disposed. Each phosphor layer 131 receives excitation light emitted from the excitation light source 70 and emits light in a predetermined wavelength band.

  And this base material 130 has the 1st thru | or 3rd three segment area | regions 141-143, and the red which light-emits the red (R) wavelength band light which is a primary color on one surface of the 1st area | region 141. A phosphor layer 131R is fixed, and a green phosphor layer 131G that emits light of a primary color green (G) wavelength band is fixed to one surface of the second region 142, and one of the third regions 143 is fixed. A blue phosphor layer 131 </ b> B that emits light of a blue (B) wavelength band as a primary color is fixed to the surface.

  In addition, the base material 130 can also be formed by three filter pieces corresponding to the three segment regions 141 to 143, and the phosphor layer 131 is fixed with each filter piece, and then bonded in a circular shape. Alternatively, it may be integrated by a mounting member or the like. The phosphor layer 131 is composed of a phosphor crystal and a binder.

  The substrate 130 transmits excitation light over the entire surface on the side where the phosphor layer 131 is disposed, and reflects other wavelength band light other than excitation light such as wavelength band light emitted from the phosphor. The dichroic layer 134 is formed by coating, and the phosphor layer 131 is formed on the dichroic layer 134.

  In this embodiment, the excitation light is transmitted through the entire surface of the substrate 130 on the side where the phosphor layer 131 is disposed, and other than the excitation light including red, green, and blue wavelength band light emitted from the phosphor. Although the dichroic layer 134 that reflects light in other wavelength bands is formed, the dichroic layer 134 having different characteristics may be formed in each segment region. For example, the first region 141 is coated with a coating that transmits wavelength light other than red light including excitation light and reflects red light on the entire surface of the first region 141, and green light including excitation light on the entire surface of the second region 142. A coating that reflects other light in the wavelength band and reflects green light is applied, and the entire surface of the third region 143 transmits light in other wavelength bands other than blue light including excitation light, and reflects blue light. A coating may be applied.

  The base material 130 has a non-reflective coating layer 133 formed by coating on the entire surface opposite to the side on which the phosphor layer 131 is disposed.

  And the excitation light source 70 irradiates each segment area | region of a rotating plate with excitation light, Comprising: The seven light source bodies 72 are comprised. Of the light source bodies 72 constituting the excitation light source 70, four of the light source bodies 72 have wavelengths longer than those of the red and green wavelength bands emitted from the red and green phosphor layers 131R and 131G in the first region 141 and the second region 142. Light emitting diodes or laser light emitters as blue light source bodies 72B that emit blue wavelength band light, which is short visible light, and the remaining three light source bodies 72 are blue phosphors in the third region 143 The light emitting diode or laser light emitter as the ultraviolet light source 72U that emits light in the ultraviolet wavelength band, which is invisible light having a shorter wavelength than the blue wavelength light emitted from the layer 131B, is used.

  As shown in FIG. 3, in the excitation light source 70, the optical axis of each light source 72, the optical axis of the light guide device 75, and the rotation axis of the fluorescent wheel 71 are parallel to the front side of the projector 10. The excitation light condensing lens 139 is disposed on the optical axis of each light source body 72 and so that the excitation light is condensed on the phosphor layer 131 attached to the fluorescent wheel 71. It is what.

  Further, in order to increase the amount of monochromatic light emitted from the phosphor of one phosphor layer 131 by the excitation light from the excitation light source 70 and improve the utilization efficiency of the effective light, it is shown in FIGS. As described above, the incident mask 136 having an opening formed corresponding to the shape of the light guide device 75 is disposed between the excitation light source 70 and the fluorescent wheel 71.

  Each light source 72 of the excitation light source 70 is controlled to blink by the control unit 38 of the projector control means in conjunction with the rotation of the rotating plate. The blue light source 72B is emitted from the blue light source 72B. The red and green phosphor layers 131R and 131G of the rotating plate are positioned on the optical path of the excitation light to be emitted, and the blue phosphor layer 131B is on the optical path of the emitted light from the blue light source 72B. The ultraviolet light source 72U is turned on only when the blue phosphor layer 131B of the rotating plate is positioned on the optical path of the ultraviolet light emitted from the ultraviolet light source 72U. When the red and green phosphor layers 131R and 131G are positioned on the optical path of the light emitted from the ultraviolet light source 72U, the light is controlled to be turned off.

  In this way, the blue and ultraviolet light source bodies 72B and 72U are controlled to blink each time each segment region of the rotating plate that rotates on the optical axis of the excitation light source 70 is positioned. Wavelength band lights are sequentially switched and emitted, and red, green, and blue wavelength band lights are sequentially generated from the phosphor that has absorbed the excitation light. Then, the DMD that is the display element 51 of the projector 10 displays the data in a time-sharing manner in accordance with the irradiation timing of the excitation light source 70, thereby generating a color image on the screen.

  When a light source 72 that emits excitation light in the same wavelength band is irradiated onto a plurality of types of phosphor layers 131, excitation light in a plurality of different wavelength bands is applied to the phosphor having relatively low wavelength conversion efficiency. It is good also as making it irradiate. For example, when the red phosphor and the green phosphor are irradiated with blue excitation light having the same wavelength band, if the wavelength conversion efficiency of the red phosphor is lower than the wavelength conversion efficiency of the green phosphor, the green phosphor Is irradiated with blue excitation light only by the blue light source 72B, and the red phosphor is emitted by emitting excitation light not only from the blue light source 72B but also from several ultraviolet light sources 72U to the red phosphor. The amount of light emitted from each of the phosphors can be increased so that the light generated from each phosphor layer 131 is uniformly incident on the light guide device 75. Conversely, it is also possible to perform control such as improving the luminance of only one color by intentionally increasing the amount of light emitted from a predetermined phosphor.

  Next, light emitted from the fluorescent wheel 71 and incident on the light guide device 75 will be described. When blue excitation light is irradiated from the excitation light source 70 to the first region 141, the excitation light passes through the non-reflective coating layer 133 on the incident surface of the first region 141 with almost no reflection toward the excitation light source 70 side. Incident on the substrate 130. Then, the excitation light transmitted through the substrate 130 passes through the dichroic layer 134 and is irradiated to the red phosphor layer 131R. The phosphor of the red phosphor layer 131R absorbs the excitation light and emits red wavelength band light in all directions. Among these, the red light emitted toward the light guide device 75 enters the light guide device 75 as it is, the red light emitted toward the base material 130 is reflected by the dichroic layer 134, and most of the reflected light is fluorescent. The light emitted from the wheel 71 is incident on the light guide device 75.

  Similarly, when blue excitation light is emitted from the excitation light source 70 to the second region 142, green wavelength band light is generated by the phosphor of the green phosphor layer 131G in the second region 142, and the green light is guided. The light enters the device 75.

  Then, when ultraviolet light, which is excitation light, is irradiated from the excitation light source 70 to the third region 143, blue wavelength band light is generated by the phosphor of the blue phosphor layer 131B in the third region 143, as described above. Then, the blue light is incident on the light guide device 75.

  And the light guide device 75 in a present Example is used as the taper light tunnel formed in the hollow substantially square frustum shape as shown in FIG.5 and FIG.6. 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. Then, by making the length and width of the exit surface approximately twice the length and width of the entrance surface of the 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, and the incident surface and the exit surface have the same length and width, and a condensing lens group is arranged on the incident surface side of the light tunnel. The diffused light emitted from the fluorescent wheel 71 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.

  Thereby, the rotating plate of the fluorescent wheel 71 is rotated, and the excitation light emitted from the excitation light source 70 so that each of the light source bodies 72 constituting the excitation light source 70 emits excitation light only to the corresponding phosphor layer 131. When switching control is performed, red, green, and blue wavelength band lights are sequentially incident on the light guide device 75 from the fluorescent wheel 71, and the DMD that is the display element 51 of the projector 10 transmits the data according to the irradiation timing of the excitation light source 70. By performing the division display, a color image is generated on the screen.

  In this way, two or more different phosphor layers 131 that generate excitation light in a predetermined wavelength band upon receiving excitation light are arranged on a circular base material 130 that can be controlled to rotate, and emit excitation light in a predetermined wavelength band. Two or more different types of light such as ultraviolet light or blue light having higher energy than the wavelength band light generated by the phosphor from the excitation light source 70 that is capable of emitting light of at least two different wavelength bands. By sequentially switching the wavelength band light as excitation light and irradiating the phosphors of the phosphor layers 131, light of predetermined wavelength bands such as red, green, and blue can be generated.

  Accordingly, each of the light source bodies 72 is necessary for light emission of each phosphor layer 131 by turning on or off according to the rotation of the base material 130 so that the excitation light is irradiated only to the corresponding phosphor. Therefore, the excitation light source 70 can be composed of a plurality of types of light source bodies 72 that match the characteristics of the respective phosphors. Therefore, it is possible to provide the light source device 63 that can obtain a predetermined light emission amount without increasing the number of light source bodies 72 more than necessary, and the projector 10 including the light source device 63.

  Moreover, rigidity can be given by making the base material 130 into a glass base material, or weight reduction and cost reduction can be achieved by making the base material 130 into a transparent resin base material.

  Since the surface of the base material 130 on which the phosphor layer 131 is disposed has the dichroic layer 134, the light emitted to the base material 130 side is reflected to the light guide device 75 side to guide the light. The amount of light incident on the device 75 can be increased.

  Furthermore, since the non-reflective coating layer 133 is provided on the surface of the substrate 130 opposite to the side where the phosphor layer 131 is disposed, the utilization efficiency of the excitation light emitted from the excitation light source 70 can be improved. You can also.

  Further, by adopting a light emitting diode or laser light emitter as the excitation light source 70, 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.

  And about the combination of the predetermined wavelength band light inject | emitted from the excitation light source 70, and the predetermined wavelength band light inject | emitted from the several layer 131 of fluorescent substance, let excitation light be the wavelength band light of a blue region and an ultraviolet region, Various modes can be adopted without being limited to the case where the light emitted from the fluorescent wheel 71 is the primary wavelength band light.

  For example, in each segment region, a phosphor layer 131 that emits a yellow wavelength band light that is a complementary color may be disposed in addition to a phosphor layer 131 that emits a primary wavelength band light. Thereby, the brightness of the light source device 63 can be increased to improve the color reproducibility.

  Further, as a constant arrangement pattern in the circumferential direction of the phosphor layer 131, light of three wavelength bands is repeatedly emitted from the six segment regions so as to be red, green, blue, red, green, and blue. May be. Thereby, it is possible to prevent color separation due to the color braking phenomenon without changing the rotation speed of the fluorescent wheel 71.

  Further, the excitation light source 70 is not limited to the case where the excitation light source 70 is composed of an ultraviolet light source 72U that emits light in the ultraviolet wavelength band and a blue light source 72B that emits light in the blue wavelength band. Various light source bodies 72 that can emit light having a wavelength band higher in energy than the wavelength band light generated by each phosphor can also be incorporated. For example, red, green are emitted by the excitation light source 70 that emits purple wavelength band light. The light source 72 that emits the blue phosphor or emits the green wavelength band light can emit the red wavelength band light.

  As shown in FIG. 7, the light source device 63 includes an auxiliary base material 137 made of a transparent material formed in a circular shape corresponding to the shape of the base material 130 on the side opposite to the excitation light source 70 side of the base material 130. May be arranged. The auxiliary base material 137 has a segment area having the same shape as the base material 130. Further, since it is fixed to the wheel motor 73 like the base material 130, the auxiliary base material 137 rotates synchronously with the base material 130 at the same speed.

  The auxiliary base material 137 reflects the excitation light, which is the wavelength band light in the blue or ultraviolet region, and the other wavelength band light other than the excitation light such as the wavelength band light emitted from the phosphor of the phosphor layer 131. The excitation light reflecting layer 132 that passes through is formed in the segment region on the surface on the base material 130 side by coating, and the non-reflective coating layer 133 is formed on the entire surface opposite to the base material 130 side by coating. .

  The excitation light reflecting layer 132 is formed as a reflecting layer having different characteristics depending on the type of the phosphor layer 131 of the base material 130 disposed to face the auxiliary base material 137 in each segment region. It reflects the excitation light applied to the facing phosphor layer 131 and transmits other wavelength band light. Specifically, the red and green phosphor layers 131R and 131G are irradiated to the segment region of the auxiliary base material 137 facing the segment region of the base material 130 on which the red and green phosphor layers 131R and 131G are formed. Of the auxiliary substrate 137 facing the segment region of the substrate 130 where the blue excitation light reflecting layer 132B that reflects the blue excitation light and transmits the other wavelength band light is formed, and the blue phosphor layer 131B is formed. In the segment region, an ultraviolet excitation light reflecting layer 132U that reflects the ultraviolet light applied to the blue phosphor layer 131B and transmits the other wavelength band light is formed.

  As in the case shown in FIG. 6, three segment regions are formed on the rotating plate of the fluorescent wheel 71, the red phosphor layer 131 </ b> R is fixed to the first region 141, and the green fluorescence is applied to the second region 142. When the body layer 131G is fixed, the blue phosphor layer 131B is fixed to the third region 143, and the first region 141 is irradiated with excitation light that is blue wavelength band light from the blue light source 72B, the excitation is performed. The light passes through the non-reflective coating layer 133 on the incident surface of the first region 141 with almost no reflection toward the excitation light source 70 and enters the base material 130.

  Then, as shown in FIG. 7, the excitation light that has passed through the substrate 130 passes through the dichroic layer 134 and is applied to the red phosphor layer 131 </ b> R. The red phosphor layer 131R absorbs the excitation light and emits red wavelength band light in all directions. Among these, the light emitted toward the light guide device 75 is incident on the auxiliary base material 137 side as it is, the light emitted toward the base material 130 side is reflected by the dichroic layer 134, and most of the reflected light is the auxiliary base material. 137 is incident. However, at this time, there is also blue excitation light that passes through the red phosphor layer 131R without being absorbed and enters the auxiliary base material 137.

  Then, when red light and blue excitation light are incident on the auxiliary base material 137 side, the blue excitation light is reflected by the excitation light reflecting layer 132 of the auxiliary base material 137 and is incident on the red phosphor layer 131R again and absorbed. The red wavelength band light is generated by the phosphor of the phosphor layer 131 </ b> R, and the red light is incident on the auxiliary base material 137. The red light incident on the auxiliary base material 137 passes through the excitation light reflecting layer 132, the auxiliary base material 137, and the non-reflective coating layer 133, is emitted from the fluorescent wheel 71, and is incident on the light guide device 75. Become.

  Similarly, when the second region 142 is irradiated with excitation light from the blue light source 72B, green wavelength band light is generated by the phosphor of the green phosphor layer 131G, and the green light is incident on the light guide device 75. The Rukoto. When the third region 143 is irradiated with excitation light that is ultraviolet wavelength band light from the ultraviolet light source 72U, the excitation light is absorbed by the phosphor of the blue phosphor layer 131B in the third region 143, and the blue light is emitted. Wavelength band light is generated. In the same manner as described above, the ultraviolet light that is transmitted without being absorbed by the blue phosphor layer 131B and is incident on the auxiliary base material 137 is reflected by the ultraviolet excitation light reflecting layer 132U of the auxiliary base material 137 and is again blue. Incident and absorbed by the phosphor layer 131B, blue light is generated.

  In the case where the red and green phosphor layers 131R and 131G are irradiated with excitation light from the ultraviolet light source 72U as well as the blue light source 72B, the base material 130 on which the red and green phosphor layers 131R and 131G are formed. The excitation light reflecting layer 132 that reflects the blue light and the ultraviolet light irradiated to the red and green phosphor layers 131R and 131G and transmits the other wavelength band light to the segment region of the auxiliary base material 137 facing the segment region. By reflecting the blue light and the ultraviolet light, which are excitation lights that have passed through the red and green phosphor layers 131R and 131G, the red light and green light are incident on the red and green phosphor layers 131R and 131G. Light can be generated.

  As described above, the phosphor layer 131 is formed by disposing the auxiliary base material 137 on which the shape and the segment region corresponding to the shape of the base material 130 are formed on the side opposite to the excitation light source 70 side of the base material 130. The excitation light that has passed through is reflected to the base material 130 side, is incident on the phosphor layer 131 again, is absorbed by the phosphor, and can generate light of a predetermined wavelength band. The amount of light to be increased can be increased. Further, since the non-reflective coating layer 133 is formed on the surface opposite to the substrate 130 side, the utilization efficiency of the emitted light can be improved.

  Then, the light source device 63 of the present invention increases the amount of light incident on the light guide device 75, and as shown in FIG. 8, the rotating plate is composed of an excitation light source 70 and an ultraviolet light source body 72U configured by a blue light source body 72B. In some cases, it is arranged between the excitation light source 70 and the excitation light is emitted from the front-rear direction of the rotating plate to generate light of a predetermined wavelength band and enter the light guide device 75. The light source device 63 includes a plurality of ultraviolet light source bodies 72U on the side opposite to the emission surface of the base material 130, and is arranged so that the optical axis of the ultraviolet light source body 72U is parallel to the rotation axis of the fluorescent wheel 71. In the plurality of blue light source bodies 72B, the excitation light emitted from the blue light source body 72B passes through the excitation light condensing lens 139 on the emission surface side of the base material 130. At a position away from the optical axis of the excitation light source 70 by a predetermined distance so as to irradiate the body layer 131 and not to block the light emitted from the fluorescent wheel 71 and entering the light guide device 75. It is arranged at a predetermined angle.

  As shown in the figure, the excitation light source 70, which is an assembly of the blue light source bodies 72B, and the excitation light source 70, which is an assembly of the ultraviolet light source bodies 72U, are not limited to the case where they are arranged at different positions. The light source 70 may be disposed only on the emission surface side of the fluorescent wheel 71, or an assembly in which blue and ultraviolet light source bodies 72B and 72U are mixed is disposed as an excitation light source 70 in the front-rear direction of the fluorescent wheel 71. The phosphor may be irradiated with excitation light.

  And when arrange | positioning the excitation light source 70 only to the output surface side of a rotating plate, as shown in FIG. 9, it does not form the base material 130 of a rotating plate with transparent materials, such as a glass base material and a transparent resin base material, but a copper plate It may be formed of a heat transfer member such as. At this time, the phosphor layer 131 is attached to the disk-shaped base material 130 in the same manner as described above, and the excitation light source 70 is disposed only on the emission surface side to which the phosphor layer 131 is attached. A reflective layer 138 is formed on the entire surface to reflect each color light generated by the excitation light and the phosphor by silver vapor deposition or the like.

  As a result, the excitation light emitted from the excitation light source 70 is absorbed by the phosphor of the phosphor layer 131, and the wavelength band light of each color is generated by the phosphor, and the color light emitted from the phosphor is guided. The light can be sequentially incident on the optical device 75. The excitation light transmitted through the phosphor layer 131 and emitted toward the substrate 130 is reflected by the reflection layer 138 and is again absorbed by the phosphor layer 131, and is generated by the phosphor and is emitted toward the substrate 130. Each emitted color light can also be reflected by the reflective layer 138 and incident on the light guide device 75.

  As described above, the excitation light source 70 may be arranged only on the emission surface side of the fluorescent wheel 71, and the optical axis of the excitation light source 70 is not necessarily arranged so as to be parallel to the rotation axis of the fluorescent wheel 71. I don't need it. Therefore, since a plurality of excitation light sources 70 can be employed and the degree of freedom in arrangement can be given, the amount of light can be increased and the size can be reduced easily. Further, by using a heat transfer member such as a copper plate as the base material 130, heat can be distributed to the entire heat transfer member to effectively dissipate heat.

  The present invention is not limited to the above-described embodiments, and can be freely changed and improved without departing from the gist of the invention. For example, the segment region in which the phosphor layer 131 is disposed is not limited to the fan shape as shown in the drawings, and may have other shapes such as an oval having the rotation circumferential direction as a major axis.

  The base material 130 made of a transparent material is coated with the dichroic layer 134 on the surface on which the phosphor layer 131 is disposed as described above, and on the side on which the phosphor layer 131 is disposed. Is not limited to the case where the non-reflective coating layer 133 is coated on the opposite side surface. Conversely, the non-reflective coating layer 133 is coated on the surface on the side where the phosphor layer 131 is disposed, A dichroic layer 134 may be coated on the surface. Thereby, the light emitted from the phosphor layer 131 to the base material 130 side is reflected by the dichroic layer 134 toward the light guide device 75 side, and the amount of light incident on the light guide device 75 can be increased. The utilization efficiency of the excitation light irradiated from 70 can be improved.

DESCRIPTION OF SYMBOLS 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 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM 26 Display Drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir reception unit 36 Ir processing unit 37 Key / indicator unit 38 Control unit 41 Power supply control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 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 70 Excitation light source 71 Fluorescent wheel 72 Light source body 72B Blue light source body 72U Ultraviolet light source body 73 Wheel motor 74 Reflection mirror 75 Light guide device 77 Optical unit block DESCRIPTION OF SYMBOLS 8 Illumination side 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 Light source power supply circuit block 102 Power supply control circuit board 103 Control circuit board 110 Blower 111 Suction port 113 Discharge port 114 Exhaust temperature reducing device 120 Partition wall 121 Intake side space chamber 122 Exhaust side space chamber 130 Base material 131 Phosphor layer 131R Red phosphor layer 131G Green phosphor layer 131B Blue phosphor layer Layer 132 Excitation light reflection layer 132B Blue excitation light reflection layer 132U Ultraviolet excitation light reflection layer 133 Non-reflective coating layer 134 Dichroic layer 136 Incident mask 137 Auxiliary base material 138 Reflection layer 139 Excitation light condensing lens 141 First region 142 Second region 143 Third area

Claims (11)

An excitation light source including two or more light source bodies that emit excitation light of a predetermined wavelength band and capable of emitting light of at least two different wavelength bands;
A substrate on which two or more phosphor layers are disposed;
With
The light source device, wherein the excitation light source is controlled so that excitation light of each predetermined wavelength band of the light source body irradiates the corresponding phosphor layer of the base material with excitation light. An auxiliary substrate is disposed on the side of the substrate opposite to the side on which the excitation light source is disposed;
In the auxiliary base material, an excitation light reflecting layer that reflects the excitation light on the surface on the base material side and transmits the wavelength band light emitted from the phosphor is formed corresponding to each segment region of the base material. The light source device according to claim 1, wherein: An excitation light source including two or more light source bodies that emit excitation light of a predetermined wavelength band and capable of emitting light of at least two different wavelength bands;
A substrate on which two or more phosphor layers are disposed;
An auxiliary substrate disposed on the opposite side of the substrate from the side on which the excitation light source is disposed;
With
The excitation light source is controlled such that each of the light source bodies emits excitation light to the corresponding phosphor layer of the substrate,
In the auxiliary base material, an excitation light reflecting layer that reflects the excitation light on the surface on the base material side and transmits the wavelength band light emitted from the phosphor is formed corresponding to each segment region of the base material. ing
A light source device characterized by that. The base material has a dichroic layer that transmits the excitation light and reflects the wavelength band light emitted from the phosphor on the surface on which the phosphor layer is disposed. The light source device according to any one of claims 1 to 3 . The light source according to any one of claims 1 to 4, wherein the base material has a non-reflective coating layer on a surface opposite to a side on which the phosphor layer is disposed. apparatus. 6. The light source according to claim 2 , wherein the auxiliary base material has a non-reflective coating layer on a surface opposite to the side on which the base material is disposed. apparatus. The substrate is a light source device according to any one of claims 1 to 6, characterized in that it is formed of a glass substrate or transparent resin substrate.   The light source device according to claim 1, wherein the base material is formed of a heat transfer member, and a reflective layer is formed on a surface on which the phosphor layer is disposed. At least one of the light source of the plurality is to emit blue wavelength band light, other light source body, according to claim 1 to claim 8, characterized in that for emitting the wavelength-band light in the ultraviolet range The light source device according to any one of the above. The base material includes a segment region in which a phosphor layer emitting red wavelength band light is disposed, a segment region in which a phosphor layer emitting green wavelength band light is disposed, and a blue wavelength band light. A segment region in which a phosphor layer emitting light is disposed, and at least one of the light source bodies emits blue wavelength band light to the phosphor layer emitting red and green wavelength band light. irradiated, at least one of said light source, any one of claims 1 to 9 and irradiating the wavelength band of the ultraviolet region to the layer of phosphor emitting the blue wavelength band light The light source device according to 1. A light source device, a display element, a light source side optical system that guides light from the light source device to the display element, a projection side optical system that projects an image emitted from the display element onto a screen, and the light source device And a projector control means for controlling the display element,
Projector, wherein the light source device is a light source device according to any one of claims 1 to 10.

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