JP5418839B2 - Light source unit and projector - Google Patents

Description

  The present invention relates to a light source unit and a projector including the light source unit.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project 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. 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, in such projectors, those using a high-intensity discharge lamp as the light source have been the mainstream, but in recent years, light-emitting diodes (LEDs), laser diodes (LD), organic ELs, Many developments and proposals using phosphors have been made.

  For example, a light source device disclosed in Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 1) has red, green, and blue phosphor layers juxtaposed on the surface of a fluorescent wheel made of a translucent disk. A dichroic filter that transmits ultraviolet light and reflects visible light is disposed on the back surface of the fluorescent light, and the phosphor layer is irradiated with ultraviolet light from the back surface side of the fluorescent wheel to generate light sources in the red, green, and blue wavelength bands. Yes.

  In addition, the applicant of the present application described in the previous application, a blue laser emitter, a fluorescent emission region in which a green phosphor layer is laid on the reflection surface, and a diffuse transmission in which a diffusion transmission plate is provided in the opening. The light source unit provided with the fluorescent wheel in which the area | region was arranged in the circumferential direction, and the red light emitting diode is proposed. In this proposal, the light emitted from the red light emitting diode is used as the light source light in the red wavelength band, and the light emitted from the green phosphor layer emitted using the light emitted from the blue laser emitter as the excitation light is used as the light source light in the green wavelength band. The light emitted from the diffuse transmission plate through which the light emitted from the blue laser emitter is diffusely transmitted is used as light source light in the blue wavelength band.

  Further, the applicant of the present application, in the previous application, a laser emitter as an excitation light source, a fluorescent wheel in which an annular green phosphor layer is laid on the reflecting surface, a red light emitting diode, a blue light emitting diode, We have also proposed a light source unit equipped with

JP 2004-341105 A

  In the light source unit including the excitation light source, the fluorescent wheel, the red light emitting diode, and the blue light emitting diode as described above, and the annular green phosphor layer is laid on the reflective surface of the fluorescent wheel, the fluorescent wheel Can be prevented from causing fluorescence saturation and temperature rise, and it is not necessary to synchronize the lighting timing of the excitation light source and the rotation of the fluorescent wheel, thereby facilitating light source control. .

  However, since only one type of green phosphor layer is laid on the fluorescent wheel, for example, when the environment where the projector is used is a bright place and high-brightness projection is required, and when the projector is used The brightness and saturation of the projected image could not be adjusted in the dark place where high-saturation projection was required.

  The present invention has been made in view of the problems of the prior art as described above, and includes a fluorescent wheel in which a plurality of types of phosphor layers having different properties are laid on a reflective surface. An object of the present invention is to provide a light source unit capable of easily adjusting saturation and the like, and a projector capable of projecting according to a use environment by including the light source unit.

  The light source unit of the present invention includes an excitation light irradiating device including an excitation light source, and a fluorescent light in which at least two phosphor layers having different properties for receiving the emitted light from the excitation light irradiating device and emitting fluorescent light are laid. A wheel, a wheel motor that rotationally drives the fluorescent wheel, a red light source device that emits red wavelength band light, a blue light source device that emits blue wavelength band light, the fluorescent light emitted from the fluorescent wheel, and the red light source A light source side optical system for condensing light emitted from the device and the blue light source device on a predetermined surface, the excitation light irradiation device, the red light source device, and the blue light source device in a time-sharing control, and the wheel motor And a light source control means for controlling.

  According to the present invention, by providing a fluorescent wheel in which a plurality of types of phosphor layers having different properties are laid on the reflecting surface according to the excitation light source, the brightness of the projected image can be combined with the red light source device or the blue light source device. It is possible to provide a light source unit capable of easily adjusting saturation and the like, and a projector capable of projecting according to the use environment by including the light source unit.

1 is an external perspective view showing a projector according to an embodiment of the invention. It is a functional circuit block diagram of the projector which concerns on the Example of this invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. It is a front schematic diagram of the fluorescent wheel which concerns on the Example of this invention. It is a figure showing the relationship between the lighting timing of each light source in the light source unit which concerns on the Example of this invention, and rotation of a fluorescent wheel. It is a front schematic diagram of the fluorescent wheel which concerns on the other Example of this invention. It is a figure showing the relationship between the lighting timing of each light source in the light source unit which concerns on the other Example of this invention, and rotation of a fluorescence wheel. It is a front schematic diagram of the fluorescent wheel which concerns on a further different Example of this invention.

  Hereinafter, modes for carrying out the present invention will be described. The projector 10 of the present invention includes a light source unit 60, a display element 51 that modulates light from the light source unit 60 to generate an image, and a light guide optical system 170 that guides light from the light source unit 60 to the display element 51. And a projection-side optical system 220 that projects an image emitted from the display element 51 onto a screen. In addition, the projector 10 includes projector control means including a light source control circuit 41 as light source control means for controlling the light source unit 60.

  The light source unit 60 includes an excitation light irradiation device 70 including an excitation light source 71, a fluorescent wheel 101 that emits fluorescent light, a wheel motor 110 that rotationally drives the fluorescent wheel 101, and a red light that emits red wavelength band light. A light source device 120, a blue light source device 300 that emits light in a blue wavelength band, a light source that condenses fluorescent light emitted from the fluorescent wheel 101 and light emitted from the red light source device 120 and the blue light source device 300 on a predetermined surface. Side optical system 140.

  Further, the fluorescent wheel 101 is formed by laying phosphor layers 103a, 103b, 103c having two or more different properties, and the phosphor layers 103a, 103b, 103c having two or more different properties are separated from the excitation light irradiation device 70. In response to the emitted light, fluorescent light having different luminance, saturation, or wavelength band is emitted.

  Further, in the light source unit 60 of the present invention, the fluorescent wheel 101 has a plurality of green phosphor layers 103a, 103b, 103c having different properties on the surface irradiated with the light emitted from the excitation light irradiation device 70 in the circumferential direction. It is arranged side by side. Then, the light source control circuit 41 sequentially turns on the red light source device 120, the excitation light source 71, and the blue light source device 300, and when the excitation light source 71 is turned on, specific green fluorescence in the plurality of green phosphor layers 103a, 103b, and 103c. The wheel motor 110 is controlled so that the body layers 103a, 103b, and 103c are located at predetermined positions.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of the projector 10. In this embodiment, left and right in the projector 10 indicate the left and right direction with respect to the projection direction, and front and rear indicate the screen side direction of the projector 10 and the front and rear direction with respect to the traveling direction of the light beam.

  As shown in FIG. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a front side plate of the projector housing. The panel 12 is provided with a plurality of intake holes 18. Further, although not shown, an Ir receiving unit for receiving a control signal from the remote controller is provided.

  In addition, a key / indicator unit 37 is provided on the top panel 11 of the housing. The key / indicator unit 37 switches a power switch key, a power indicator for notifying power on / off, and switching on / off of projection. Keys and indicators such as an overheat indicator for notifying when a projection switch key, a light source unit, a display element, a control circuit, etc. are overheated are arranged.

  In addition, on the rear surface of the housing, there are provided 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 image signal input, an S terminal, an RCA terminal, etc. on the rear panel. Yes. A plurality of intake holes 18 are formed in the back panel. A plurality of exhaust holes 17 are formed in each of the right panel, which is a side plate of the housing (not shown), and the left panel 15, which is the side plate shown in FIG. An intake hole 18 is also formed at a corner near the back panel of the left panel 15. Further, a plurality of intake holes or exhaust holes are also formed in the vicinity of the front, back, left and right panels of the lower panel (not shown).

  Next, projector control means of the projector 10 will be described with reference to the block diagram of FIG. The projector control means 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. Image signals of various standards input from the input / output connector unit 21 are input / output. The image conversion unit 23 converts the image signal into a predetermined format suitable for display via the interface 22 and the system bus (SB), and outputs the image signal to the display encoder 24.

  The display encoder 24 develops and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display drive unit 26.

  The display drive unit 26 functions as display element control means, and drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24. The light beam emitted from the light source unit 60 is irradiated onto the display element 51 through the light guide optical system, thereby forming an optical image with the reflected light of the display element 51, and a projection side optical system to be described later The image is projected and displayed on a screen (not shown). The movable lens group 235 of the projection side optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman coding, and sequentially written in a memory card 32 that is a detachable recording medium. Further, the image compression / decompression unit 31 reads the image data recorded on the memory card 32 in the reproduction mode, decompresses individual image data constituting a series of moving images in units of one frame, and converts the image data into the image conversion unit 23. Is output to the display encoder 24 and the processing for enabling the display of a moving image or the like based on the image data stored in the memory card 32 is performed.

  The control unit 38 controls 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. .

  An operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the top panel 11 of the housing is directly sent to the control unit 38, and a key operation signal from the remote controller is sent to the Ir receiving unit 35. , And the code signal demodulated by the Ir processor 36 is output to the controller 38.

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

  Further, the control unit 38 controls a light source control circuit 41 as a light source control unit, and the light source control circuit 41 is configured so that light source light of a predetermined wavelength band required at the time of image generation is emitted from the light source unit 60. Further, the light emission of the excitation light irradiation device, the red light source device, and the blue light source device of the light source unit 60 and the rotation of the fluorescent wheel are controlled.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source unit 60 and the like, and controls the rotation speed of the cooling fan from the result of the temperature detection. Further, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector body is turned off by a timer or the like, or to turn off the projector body depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Next, the internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10. As shown in FIG. 3, the projector 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projector 10 includes a light source unit 60 on the side of the control circuit board 241, that is, at a substantially central portion of the projector housing. Further, the projector 10 includes an optical system unit 160 between the light source unit 60 and the left panel 15.

  The light source unit 60 includes an excitation light irradiation device 70 disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing, and an optical axis of a light beam emitted from the excitation light irradiation device 70. A fluorescent light emitting device 100 disposed in the vicinity of the front panel 12, a blue light source device 300 disposed in the vicinity of the front panel 12 so as to be parallel to the light bundle emitted from the fluorescent light emitting device 100, and excitation. Red light source device 120 disposed between light irradiation device 70 and fluorescent light emitting device 100, light emitted from fluorescent light emitting device 100, light emitted from red light source device 120, light emitted from blue light source device 300 A light source side optical system 140 that converts the respective axes so as to be the same optical axis and collects each color light at the entrance of the light tunnel 175 that is a predetermined surface.

  The excitation light irradiation device 70 includes an excitation light source 71 arranged so that the optical axis thereof is parallel to the back panel 13, and a reflection mirror group 75 that converts the optical axis of light emitted from the excitation light source 71 by 90 degrees in the direction of the front panel 12. And a condensing lens 78 that condenses the light emitted from the excitation light source 71 reflected by the reflection mirror group 75, and a heat sink 81 disposed between the excitation light source 71 and the right panel 14.

  The excitation light source 71 includes a plurality of blue laser emitters arranged in a matrix, and a collimator lens 73 that converts the emitted light from each blue laser emitter into parallel light on the optical axis of each blue laser emitter. Are arranged respectively. The reflection mirror group 75 includes a plurality of reflection mirrors arranged in a stepped manner, and reduces the cross-sectional area of the light beam emitted from the excitation light source 71 in one direction and emits it to the condensing lens 78.

  A cooling fan 261 is disposed between the heat sink 81 and the back panel 13, and the excitation light source 71 is cooled by the cooling fan 261 and the heat sink 81. Further, a cooling fan 261 is also disposed between the reflection mirror group 75 and the back panel 13, and the reflection mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

  The fluorescent light emitting device 100 is arranged so as to be parallel to the front panel 12, that is, the fluorescent wheel 101 disposed so as to be orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and the fluorescent wheel 101 is rotationally driven. And a condensing lens group 111 that condenses the light bundle emitted from the fluorescent wheel 101 toward the rear panel 13.

  FIG. 4 is a schematic front view of the fluorescent wheel 101. As shown in FIG. 4, the fluorescent wheel 101 is a disc-shaped metal substrate having an opening at the center, and has three types with different properties on the surface irradiated with the light emitted from the excitation light source 71. The phosphor layers 103 are arranged side by side in the circumferential direction. The three types of phosphor layers 103 have an arc shape having a predetermined width in the radial direction, and the three types of phosphor layers 103 having a predetermined width are arranged in parallel in the circumferential direction, so A body region 102 is formed. Furthermore, the surface of the fluorescent wheel 101 on which the three types of phosphor layers 103 are laid is mirrored by silver vapor deposition or the like to be a reflective surface.

  In addition, the three types of phosphor layers 103 are a first green phosphor layer 103a that emits green light with a high luminance upon receiving excitation light, and a lower luminance and saturation than the first green phosphor layer 103a. A second green phosphor layer 103b that emits high green wavelength band light, and a third green phosphor layer 103c that emits green wavelength band light having lower luminance and higher saturation than the second green phosphor layer 103b. It is configured. In addition, in order to change the brightness | luminance and saturation in a fluorescent substance layer, changing the containing density | concentration of the fluorescent substance in a fluorescent substance layer, using the fluorescent substance from which a peak wavelength differs, or the width | variety of a wavelength range differs. This can be realized by using a phosphor.

  Then, the light emitted from the excitation light irradiation device 70 irradiated to the phosphor layer 103 of the fluorescent wheel 101 excites the phosphors in each phosphor layer 103, and the light flux emitted from the phosphors in all directions is The light is emitted directly to the excitation light source 71 side or after being reflected by the reflection surface of the fluorescent wheel 101 to the excitation light source 71 side. Moreover, the excitation light irradiated to the metal substrate without being absorbed by the phosphor of the phosphor layer is reflected by the reflecting surface and is incident on the phosphor layer again to excite the phosphor layer.

  Further, as shown in FIG. 3, a cooling fan 261 is disposed between the wheel motor 110 and the front panel 12, and the fluorescent wheel 101 is cooled by the cooling fan 261.

  The red light source device 120 includes a red light source 121 disposed so that the optical axis is parallel to the excitation light source 71, and a condensing lens group 125 that condenses the light emitted from the red light source 121. The red light source device 120 is disposed so that the optical axis intersects the light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101. The red light source 121 is a red light emitting diode as a semiconductor light emitting element that emits red wavelength band light. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261.

  The blue light source device 300 includes a blue light source 301 disposed so as to be parallel to the optical axis of the light emitted from the fluorescent light emitting device 100, and a condenser lens group 305 that collects the light emitted from the blue light source 301. Prepare. The blue light source device 300 is arranged so that the light emitted from the red light source device 120 and the optical axis intersect. The blue light source 301 is a blue light emitting diode as a semiconductor light emitting element that emits light in a blue wavelength band. Furthermore, the blue light source device 300 includes a heat sink 310 disposed on the front panel 12 side of the blue light source 301. A cooling fan 261 is disposed between the heat sink 310 and the front panel 12, and the blue light source 301 is cooled by the cooling fan 261.

  The light source side optical system 140 is a condensing lens that condenses the light bundles in the red, green, and blue wavelength bands, a dichroic mirror that converts the optical axes of the light bundles in the respective color wavelength bands into the same optical axis, etc. Consists of. Specifically, the optical axis of the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent wheel 101, and the optical axis of the red wavelength band light emitted from the red light source device 120 And the light emitted from the excitation light irradiation device 70 and the red light source device 120 are transmitted, and the light emitted from the fluorescent light emitting device 100 is reflected to convert the optical axis by 90 degrees in the direction of the left panel 15. A first dichroic mirror 141 is arranged.

  Also, the light emitted from the blue light source device 300 is at a position where the optical axis of the blue wavelength band light emitted from the blue light source device 300 and the optical axis of the red wavelength band light emitted from the red light source device 120 intersect. A second dichroic mirror 148 is disposed that reflects light emitted from the red light source device 120 and the fluorescent light emitting device 100 and converts the optical axis by 90 degrees in the direction of the back panel 13. A condensing lens is disposed between the first dichroic mirror 141 and the second dichroic mirror 148, and further, near the incident surface of the light tunnel 175, the light source light is collected at the entrance of the light tunnel 175. A condensing lens is arranged.

  The optical system unit 160 includes an illumination side block 161 located on the left side of the excitation light irradiation device 70, an image generation block 165 located near a position where the back panel 13 and the left panel 15 intersect, and a light source side optical system. The projection-side block 168 located between the 140 and the left panel 15 is configured in a substantially U-shape.

  The illumination side block 161 includes a part of a light guide optical system 170 that guides the light source light emitted from the light source unit 60 to the display element 51 provided in the image generation block 165. As the light guide optical system 170 included in the illumination side block 161, the light tunnel 175 that uses the light flux emitted from the light source unit 60 as a light flux having a uniform intensity distribution, and the light emitted from the light tunnel 175 are collected. There are a condensing lens 178, an optical axis conversion mirror 181 that converts the optical axis of the light beam emitted from the light tunnel 175 in the direction of the image generation block 165, and the like.

  As the light guide optical system 170, the image generation block 165 has a condensing lens 183 that condenses the light source light reflected by the optical axis conversion mirror 181 on the display element 51, and a light beam transmitted through the condensing lens 183 as a display element. And an irradiation mirror 185 that irradiates 51 at a predetermined angle. Further, the image generation block 165 includes a DMD serving as the display element 51, and a heat sink 190 for cooling the display element 51 is disposed between the display element 51 and the rear panel 13. Element 51 is cooled. Further, a condensing lens 195 as the projection-side optical system 220 is disposed in the vicinity of the front surface of the display element 51.

  The projection-side block 168 has a lens group of the projection-side optical system 220 that emits ON light reflected by the display element 51 to the screen. The projection-side optical system 220 includes a fixed lens group 225 built in a fixed lens barrel and a movable lens group 235 built in a movable lens barrel, and is a variable focus lens having a zoom function, and is movable by a lens motor. Zoom adjustment and focus adjustment can be performed by moving the lens group 235.

  Next, a light source control method in the light source unit 60 configured as described above will be described. In the projector 10 of the present embodiment, the light source control circuit 41 as a light source control means controls the wheel motor 110 while performing time-division control of the red light source 121, the excitation light source 71, and the blue light source 301 by duty driving.

  The light source control circuit 41 generates the light source light in the order of the red wavelength band light, the green wavelength band light, and the blue wavelength band light. As shown in FIGS. The rotation of the fluorescent wheel 101 is controlled while synchronizing the rotation cycle of the fluorescent wheel 101 and the lighting cycle in which the light sources 121, 71, and 301 are sequentially turned on so that the excitation light is emitted to the phosphor layer 103.

  The details will be described below. The projector 10 of the present embodiment can project in three types of projection modes: a normal mode, a saturation priority mode, and a luminance priority mode. The normal mode is an intermediate mode between the saturation priority mode and the luminance priority mode, and is a projection mode in which average projection is performed for luminance and saturation. The saturation priority mode is a projection mode used when projecting a movie or the like in a dark room. In this projection mode, high color reproduction is achieved by giving priority to saturation over luminance, and high-quality projection is possible. is there. The brightness priority mode is a projection mode that is used when projecting in a bright place such as during a business presentation or meeting. Projecting images in bright places by giving priority to brightness over saturation. This is a projection mode that is easy to visually recognize.

  When the projector 10 according to the present embodiment performs projection in the normal mode, the light source control circuit 41 determines the timing at which the excitation light source 71 is turned on and the emission from the excitation light irradiation device 70 as shown in FIG. The rotation of the fluorescent wheel 101 is adjusted so that the timing at which the second green phosphor layer 103b of the fluorescent wheel 101 is positioned on the optical axis of the light coincides. As a result, light emitted from the second green phosphor layer 103b becomes light source light in the green wavelength band, and projection in the normal mode can be performed. A timing mark is formed on the fluorescent wheel 101, and the light source control circuit 41 can confirm the rotational position of the fluorescent wheel 101 by detecting this timing mark with a detection sensor or the like.

  When the projector 10 of this embodiment performs projection in the saturation priority mode, as shown in FIG. 5B, the light source control circuit 41 determines the timing at which the excitation light source 71 is turned on and the excitation light irradiation device 70. The rotation of the fluorescent wheel 101 is adjusted so that the timing at which the third green phosphor layer 103c of the fluorescent wheel 101 is positioned on the optical axis of the emitted light coincides. Further, when projection is performed in the luminance priority mode, as shown in FIG. 5C, the light source control circuit 41 sets the timing at which the excitation light source 71 is turned on and the optical axis of the emitted light from the excitation light irradiation device 70. The rotation of the fluorescent wheel 101 is adjusted so that the timing at which the first green phosphor layer 103a of the fluorescent wheel 101 is positioned coincides.

  In the projector 10 of the present embodiment, the projection in the plurality of projection modes can be performed by applying the plurality of phosphor layers 103 having different properties to the fluorescent wheel 101 as described above. Therefore, it is possible to provide a projector capable of projecting an image that meets the needs of the user according to the usage situation.

  Further, in the projector 10 of the present embodiment, the light source control circuit 41 sequentially turns on the red light source device 120, the excitation light source 71, and the blue light source device 300, and when the excitation light source 71 is turned on, a plurality of green phosphor layers 103a , 103b, 103c, the wheel motor 110 is controlled so that the specific green phosphor layer is located at a predetermined position. Accordingly, since the light source light is always emitted in the order of red, green, and blue wavelength band light, it is possible to project images having different properties without changing the control of the display element 51.

  In the above-described embodiment, the fluorescent wheel 101 including three types of phosphor layers having different luminance and saturation is described. However, not only the luminance and saturation but also a green phosphor layer having a different wavelength band is laid. Alternatively, it is possible to provide the projector 10 capable of projecting in a plurality of projection modes by laying a plurality of phosphor layers having different properties such as laying phosphor layers of other colors.

  For example, as shown in FIG. 6, in the circumferential direction on the reflecting surface of the fluorescent wheel 101, a first green phosphor layer 103a that emits green wavelength band light having high luminance upon receiving excitation light, and a first green phosphor A second green phosphor layer 103b that emits green wavelength band light having lower luminance and higher saturation than the layer 103a, and a green wavelength band light having lower luminance and higher saturation than the second green phosphor layer 103b. The third green phosphor layer 103c and the yellow phosphor layer 103d that receives excitation light and emits yellow wavelength band light may be arranged side by side.

  When projection is performed using the fluorescent wheel 101 having the yellow phosphor layer 103d as described above, the light source control circuit 41 includes a plurality of green phosphor layers 103a and 103b on the optical axis of the light emitted from the excitation light irradiation device 70. , 103c is controlled to turn on the excitation light source 71 at the timing at which the specific green phosphor layer is positioned and at the timing at which the yellow phosphor layer 103d is positioned on the optical axis of the light emitted from the excitation light irradiation device 70. In addition, the light source control circuit 41 sets the red light source device 120 and the blue light source device 300 at the timing when a phosphor layer other than the specific green phosphor layer is located on the optical axis of the light emitted from the excitation light irradiation device 70. Control to light up.

  That is, the light source control circuit 41 performs control to turn on the excitation light source 71 for a moment even when the red light source device 120 or the blue light source device 300 is turned on, and at the timing to turn on the excitation light source 71 for a moment. The wheel motor 110 is controlled so that the yellow phosphor layer 103d is positioned on the optical axis. Thereby, since the yellow wavelength band light is also projected when the red and / or blue wavelength band light is projected, it is possible to increase the luminance when the red and / or blue wavelength band light is projected.

  The light source control circuit 41 turns on the excitation light source 71 when the yellow phosphor layer 103d is positioned on the optical axis of the excitation light irradiation device 100 and simultaneously turns on the blue light source device 300 to emit white light. Projection control can also be performed. In addition, when projecting white light, the light source control circuit 41 can also perform control to appropriately turn on the red light source device 120 in accordance with the white hue. By controlling in this way, it becomes possible to project white light, and therefore it is possible to provide the projector 10 capable of projecting a high-luminance image.

  Further, as shown in FIG. 7, the light source control circuit 41 sets the number of times to turn on the excitation light source 71 twice for each period of rotation of the fluorescent wheel, and the first to third green phosphor layers 103a, 103b, 103c In some cases, after the excitation light source 71 is turned on once in any of the phosphor layers, the excitation light source 71 is also turned on in the yellow phosphor layer 103d. That is, the light source control circuit 41 performs control to turn on the red light source device 120 and the blue light source device 300 at a timing at which the excitation light source 71 is not turned on. In this way, the yellow phosphor layer 103d is formed on the phosphor wheel 101, and the yellow phosphor layer 103d is also excited in each cycle, so that the brightness of the projection light can be increased and the projection of a high-luminance image can be performed. A possible projector 10 can be provided.

  When the excitation light source 71 is lit twice in each cycle in this way, the order in which each color light is emitted from the light source unit 60 varies depending on the position of the green phosphor layers 103a, 103b, 103c used. To do. That is, for example, when the first green phosphor layer 103a is used, the light source light is emitted from the light source unit 60 in the order of green, red, blue, and yellow, and the second green phosphor layer 103b is used. When the third green phosphor layer 103c is used, the light source light is emitted from the light source unit 60 in the order of red, green, blue, yellow, and in the order of red, blue, green, yellow. Light source light is emitted from the light source unit 60. Therefore, the display driving unit 26 as the display element control means changes the control of the display element 51 by the selected green phosphor layers 103a, 103b, 103c to generate an image.

  Furthermore, as shown in FIG. 8, on the reflecting surface of the fluorescent wheel 101, a plurality of annular phosphor regions 102 in which a plurality of phosphor layers having a predetermined width are juxtaposed can be formed in a plurality of stages in the radial direction. That is, the fluorescent wheel 101 includes a plurality of phosphor layers having different properties in the circumferential direction, and a plurality of phosphor layers having different properties in the radial direction. In the light source unit 60 having such a fluorescent wheel 101, the wheel motor 110 is movable in the radial direction so that the predetermined annular phosphor region 102 is positioned on the optical axis of the excitation light irradiation device 70, and the light source control The circuit 41 also controls the operation of the wheel motor 110 in the radial direction.

  In this way, by laying a plurality of annular phosphor regions 102 having different properties on the reflecting surface of the fluorescent wheel 101, it is possible to emit wavelength band light of various properties from the fluorescent wheel 101. Thus, it is possible to provide the projector 10 capable of projecting in various projection modes. Although FIG. 8 shows a case where the annular phosphor region 102 has two stages, if there is a margin in the radial direction of the fluorescent wheel 101, more stages of the annular phosphor region 102 can be formed.

  The excitation light source 71 is configured to be movable by a piezoelectric element or the like so that the excitation light is not limited to a configuration in which the wheel motor 110 is movable and the different phosphors arranged in the radial direction are irradiated with the excitation light. The same effect can be obtained by changing the position. In addition, as a device for changing the optical axis of the excitation light irradiation device 70, a KTN crystal, an acousto-optic element, a MEMS mirror, etc. are arranged on the optical axis of the excitation light source 71, and the irradiation position of the excitation light on the fluorescent wheel 101 is changed. By doing so, the same effect can be obtained.

  In the present embodiment, a blue laser emitter is used as the excitation light source 71, but the present invention is not limited to this. An ultraviolet laser emitter is used as the excitation light source 71, and the phosphor of the phosphor layer 103 is excited by ultraviolet rays. The phosphor can also be made.

  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 panel 12 Front panel
13 Rear panel 14 Right panel
15 Left panel 17 Exhaust hole
18 Air intake hole 19 Lens cover
20 Various terminals 21 Input / output connector
22 I / O interface 23 Image converter
24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit
32 Memory card 35 Ir receiver
36 Ir processing section 37 Key / indicator section
38 Control unit 41 Light source control circuit
43 Cooling fan drive control circuit 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 60 Light source unit
70 Excitation light irradiation device 71 Excitation light source
73 Collimator lens 75 Reflective mirror group
78 Condenser lens 81 Heat sink
100 Fluorescent light emitting device 101 Fluorescent wheel
102 Annular phosphor region 103 Phosphor layer
103a First green phosphor layer 103b Second green phosphor layer
103c Third green phosphor layer 103d Yellow phosphor layer
110 Wheel motor 111 Condensing lens group
120 Red light source 121 Red light source
125 condenser lens group 130 heat sink
140 Light source side optical system 141 First dichroic mirror
148 Second dichroic mirror 160 Optical system unit
161 Lighting block 165 Image generation block
168 Projection side block 170 Light guiding optical system
173 Condensing lens 175 Light tunnel
178 Condensing lens 181 Optical axis conversion mirror
183 Condensing lens 185 Irradiation mirror
190 Heat sink 195 Condenser lens
220 Projection-side optical system 225 Fixed lens group
235 Movable lens group 241 Control circuit board
261 Cooling fan 300 Blue light source device
301 Blue light source 305 Condensing lens group
310 heat sink

Claims (11)

An excitation light irradiation device including an excitation light source;
A fluorescent wheel provided with at least two or more different phosphor layers emitting fluorescent light in response to light emitted from the excitation light irradiation device;
A wheel motor that rotationally drives the fluorescent wheel;
A red light source device for emitting red wavelength band light;
A blue light source device for emitting blue wavelength band light;
A light source side optical system for condensing the fluorescent light emitted from the fluorescent wheel and the light emitted from the red light source device and the blue light source device on a predetermined surface;
A light source unit comprising: a light source control unit that controls the wheel motor while performing time-division control on the excitation light irradiation device, the red light source device, and the blue light source device.   The phosphor layers having two or more different properties receive emission light from the excitation light irradiation device and emit fluorescent light having different luminance, saturation, or wavelength band, respectively. Item 2. The light source unit according to Item 1. Selecting means for selecting one projection mode from a plurality of projection modes;
The light source control unit causes the phosphor layer corresponding to the projection mode selected by the selection unit to irradiate light from the excitation light irradiation device among the plurality of phosphor layers. Or the light source unit of 2. The fluorescent wheel has a plurality of green phosphor layers with different properties arranged in parallel in the circumferential direction on the surface irradiated with the light emitted from the excitation light irradiation device,
The light source control unit sequentially turns on the red light source device, the excitation light source, and the blue light source device, and when turning on the excitation light source, a specific green phosphor layer in the plurality of green phosphor layers is in a predetermined position. The light source unit according to any one of claims 1 to 3 , wherein the wheel motor is controlled so as to be positioned at a position. The luminescent wheel further comprises a yellow phosphor layer,
The light source control means includes a timing at which a specific green phosphor layer in the plurality of green phosphor layers is positioned on an optical axis of light emitted from the excitation light irradiation device, and light emitted from the excitation light irradiation device. The excitation light source is turned on at the timing when the yellow phosphor layer is positioned on the optical axis, and a phosphor layer other than the specific green phosphor layer is positioned on the optical axis of light emitted from the excitation light irradiation device. The light source unit according to claim 4 , wherein control is performed to turn on the red light source device and the blue light source device at a timing when the light source device is turned on. The light source control means performs control to turn on the red light source device or the blue light source device at a timing when the yellow phosphor layer is positioned on the optical axis of the light emitted from the excitation light irradiation device. The light source unit according to claim 5 . The light source unit according to any one of claims 1 to 6 , wherein the light source control unit performs control to turn on the red light source device and the blue light source device at a timing at which the excitation light irradiation device is not turned on. The fluorescent wheel has a plurality of phosphor layers having different properties in a substantially circular shape with a predetermined width arranged in parallel on the surface on the side irradiated with the light emitted from the excitation light irradiation device. the light source unit according to any one of claims 1 to 7, characterized in that it comprises a plurality of stages of circular fluorescent layer in the radial direction. The wheel motor is movable in the radial direction of the fluorescent wheel,
The light source control means controls the wheel motor to operate such that a predetermined stage of the plurality of annular phosphor layers is positioned on an optical axis of light emitted from the excitation light irradiation device. The light source unit according to claim 8 , wherein: A light source unit according to any one of claims 1 to 9 ,
A display element for generating an image by modulating light from the light source unit;
A light guide optical system for guiding light from the light source unit to the display element;
A projection-side optical system that projects an image emitted from the display element onto a screen,
A projector comprising: a light source control means for controlling the light source unit; and a projector control means as a display element control means for controlling the display element. The display element control unit generates a predetermined image by controlling the display element by matching red, green, blue, and yellow wavelength band light emitted from the light source unit in the order of the emitted wavelength band light. The projector according to claim 10 .

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