JP2011128522A - Light source unit and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source unit capable of emitting fluorescent light free from color mixture and having high color purity, and a projector capable of improving color reproducibility of a projection image by including the light source unit. <P>SOLUTION: The projector includes the light source unit 60, a display element and a projector control means or the like. The light source unit 60 includes a fluorescent wheel 101 having a fluorescence light-emitting area and a diffusion area, a light source, and a light shielding wheel 331 arranged on an optical path of emitted light from the fluorescent wheel 101. The light shielding wheel 331 has a light shielding area formed corresponding to the fluorescence light-emitting area and a transmitting area formed corresponding to the diffusion area. The light shielding area is formed to transmit the fluorescent light from the fluorescence light-emitting area and shield the light from the light source which is diffused without being converted into the fluorescent light in the fluorescence light-emitting area. The transmitting area is formed to transmit the light from the light source which is diffused by the diffusion area and emitted. <P>COPYRIGHT: (C)2011,JPO&INPIT

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 a DMD (digital micromirror device) or a liquid crystal plate to display a color image on a screen.

  In the past, projectors using a high-intensity discharge lamp as the light source have been the mainstream. However, in recent years, there have been many developments of projectors using light emitting diodes, laser diodes, organic EL, phosphors, and the like as the light source. Has been made. For example, in Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 1), a light emitting diode as a light source, and a fluorescent wheel in which a phosphor layer that converts ultraviolet light emitted from the light source into visible light is formed on a transparent substrate; Have been proposed.

  However, since the proposal of Patent Document 1 uses a light source that emits high-energy ultraviolet light as excitation light, the optical component irradiated with the ultraviolet light is easily damaged, and the long-term life of the optical component is ensured. There was a problem that it became difficult.

  Therefore, in Japanese Patent Application No. 2008-127947 (patent document 2) filed by the applicant of the present application, a predetermined wavelength band light is generated by irradiating the phosphor with visible light having lower energy than ultraviolet light as excitation light, Proposals have been made for light source units that can suppress deterioration over time of optical components irradiated with excitation light and maintain performance over a long period of time.

JP 2004-341105 A Japanese Patent Application No. 2008-127947

  The proposal of Patent Document 2 proposes a fluorescence in which a red phosphor layer or a green phosphor layer that emits fluorescent light by absorbing incident light and a diffusion layer that diffuses and transmits incident light are formed adjacent to each other in the circumferential direction. By irradiating the wheel with visible light such as blue light, colors such as red, green, and blue can be sequentially generated.

  Here, when the fluorescent wheel is formed of a metal base material having a reflecting surface on the surface and a phosphor layer or a diffusion layer is laid on the reflecting surface, the phosphor layer is irradiated with blue light. When the blue light reflected so that it is diffused without being absorbed by the phosphor in the phosphor layer is mixed with the fluorescent light emitted from the phosphor, the color purity of the light emitted from the phosphor layer is lowered and projected. There is a problem of affecting the hue of the image to be displayed.

  The present invention has been made in view of the above-described problems of the prior art, and includes a light source unit capable of emitting fluorescent light with high color purity and preventing color mixing as light source light, and the light source unit. Accordingly, an object of the present invention is to provide a projector that can improve the color reproducibility of a projected image.

  The light source unit of the present invention is disposed on the optical path of the light that is emitted from the fluorescent wheel, the light source that irradiates the segment area of the fluorescent wheel with the rotation controllable fluorescent wheel having a plurality of segment areas, and the light. A rotation controllable shading wheel, and a light source control means for controlling the light emission of the light source, the fluorescent wheel having a fluorescent light emitting region and a diffusion region, and the fluorescent light emitting region from the light source A segment region that receives light and emits light of a predetermined wavelength band is formed, the diffusion region is a segment region that diffuses and emits light from the light source, and the light shielding wheel includes a light shielding region and a transmission region. The light shielding region is formed corresponding to the fluorescent light emitting region of the fluorescent wheel, transmits the fluorescent light emitted from the fluorescent light emitting region, and transmits the fluorescent light emitting region. The light from the light source diffused without being converted into fluorescent light in the region is shielded, and the transmission region is formed corresponding to the diffusion region of the fluorescent wheel, and is diffused and emitted in the diffusion region. The light source control means transmits the fluorescent wheel and the light shielding wheel at the same rotational speed so that the diffusion region of the fluorescent wheel and the light transmission region of the light shielding wheel always correspond to each other. It is characterized by controlling the rotation.

  The light source unit guides light having high directivity emitted from the light source to the fluorescent wheel, and condenses the diffused light emitted by being diffused from the fluorescent wheel on a predetermined surface. The light source side optical system includes a light guide member that reflects the highly directional light to irradiate the fluorescent wheel and transmits the diffused light, and the light guide member includes the diffusion light. A diffused light transmitting member that transmits light and a reflecting portion that is formed in a part of the center of the diffused light transmitting member on the optical axis of the light having high directivity.

  The reflecting portion is a dichroic mirror that reflects light from the light source and transmits light in other wavelength bands.

  In addition, the light source unit guides light having high directivity emitted from the light source to the fluorescent wheel, and condenses the diffused light emitted by being diffused from the fluorescent wheel on a predetermined surface. The light source side optical system includes a light guide member that transmits the highly directional light, irradiates the fluorescent wheel, and reflects the diffused light, and the light guide member includes the diffuser. The diffused light reflecting member that reflects light and a transmission part that is formed at a part of the center of the diffused light reflecting member on the optical axis of the highly directional light may be included.

  The transmission unit is a dichroic mirror that transmits light from the light source and reflects other wavelength band light.

  In this light source unit, the light source includes a laser diode that emits light in a blue wavelength band.

  In the light source unit, a phosphor layer that receives light from the light source and emits light in the green wavelength band is formed in at least one of the fluorescent light emitting regions of the fluorescent wheel.

  Furthermore, in this light source unit, a phosphor layer that receives light from the light source and emits light in a red wavelength band may be formed in at least one of the fluorescent light emitting regions of the fluorescent wheel.

  The light source unit includes a red light source having a light emitting diode that emits light in a red wavelength band, and the light source side optical system includes diffused light emitted from the fluorescent wheel and red emitted from the red light source. In some cases, light in the wavelength band is condensed on a predetermined surface.

  In the light source unit, the fluorescent wheel and the light shielding wheel may be arranged so that the rotational axis of the fluorescent wheel and the rotational axis of the light shielding wheel coincide with each other.

  Furthermore, in this light source unit, the light source control means synchronously controls the fluorescent wheel and the light shielding wheel.

  In addition, the fluorescent wheel and the light shielding wheel may be rotationally driven by the same driving device.

  The projector of the present invention includes any one of the light source units described above, a display element, a light guide optical system that guides light from the light source unit to the display element, and an image emitted from the display element. A projection-side optical system for projecting onto a screen, and projector control means for controlling the light source unit and the display element are provided.

  According to the present invention, a light source unit that can emit fluorescent light with high color purity that is prevented from being mixed as light source light, and a projector that can improve the color reproducibility of a projected image by including this light source unit. And can be provided.

It is an external appearance perspective view which shows the projector provided with the light source unit which concerns on the Example of this invention. It is a figure which shows the functional circuit block of the projector provided with the light source unit which concerns on the Example of this invention. 1 is a schematic plan view showing an internal structure of a projector provided with a light source unit according to an embodiment of the present invention. It is a plane schematic diagram of the light source unit which concerns on the Example of this invention. It is the front schematic diagram of the fluorescent wheel which concerns on the Example of this invention, and the plane schematic diagram which shows a partial cross section. It is the front schematic diagram of the light-shielding wheel which concerns on the Example of this invention, and the plane schematic diagram which shows a partial cross section. It is a plane schematic diagram of the light source unit of another form which concerns on the Example of this invention. It is a plane schematic diagram of the light source unit which concerns on the modification of this invention. It is a front schematic diagram of the fluorescent wheel and light-shielding wheel which concern on the modification of this invention.

  Hereinafter, modes for carrying out the present invention will be described. The projector 10 includes a light source unit 60, a display element 51, a light guide optical system 170 that guides light from the light source unit 60 to the display element 51, and a projection side that projects an image emitted from the display element 51 onto a screen. An optical system 220 and projector control means for controlling the light source unit 60 and the display element 51 are provided.

  The light source unit 60 includes a blue light source device 70, a fluorescent light emitting device 100 having a fluorescent wheel 101 that is rotationally driven, a light source side optical system 140, a light shielding device 330 having a rotationally driven light shielding wheel 331, Is provided. The blue light source device 70 includes a blue light source 71 in which blue laser diodes that emit directional light in the blue wavelength band are arranged in a matrix on the fluorescent wheel 101.

  The fluorescent wheel 101 of the fluorescent light emitting device 100 is made of a disk-shaped metal base material that is rotationally driven by a wheel motor 110, and has three segment regions having reflective surfaces formed on the base material. The three segment regions convert the red fluorescent light emitting region where the red phosphor layer 103R is formed, the green fluorescent light emitting region where the green phosphor layer 103G is formed, and the wavelength band of incident light. And a diffusion region in which a diffusion layer 104 that diffuses and emits is formed.

  Therefore, when the blue wavelength light from the blue light source 71 of the blue light source device 70 is irradiated to the red fluorescent light emitting region, the fluorescent light in the red wavelength band diffuses from the red phosphor layer 103R that has absorbed the blue light as excitation light. And then injected. Similarly, when the blue wavelength light from the blue light source 71 of the blue light source device 70 is irradiated onto the green fluorescent light emitting region, the fluorescent light in the green wavelength band is emitted from the green phosphor layer 103G that absorbs blue light as excitation light. Diffused and injected. When the blue wavelength band light from the blue light source 71 of the blue light source device 70 is irradiated to the diffusion region, the directional blue light is diffused by the diffusion layer 104 and emitted.

  The light source side optical system 140 guides highly directional light emitted from the blue light source 71 through the collimator lens 73 to the segment area of the fluorescent wheel 101, and diffuses each color diffused and emitted from the fluorescent wheel 101. Is condensed at the entrance of the light tunnel 175 in the light guide optical system 170, which is a predetermined surface, and includes a mirror, a condensing lens, and the like. In addition, the light source side optical system 140 reflects the blue light with high directivity from the blue light source 71 and irradiates the fluorescent wheel 101, and transmits the color diffused light in the blue, red, and green bands. 130.

  The light guide member 130 is formed in a part of the center of the diffused light transmitting member 149 that transmits each color diffused light and the diffused light transmitting member 149 on the optical axis of the highly directional blue light emitted from the blue light source 71. And a reflecting portion. The reflecting section is a blue reflecting dichroic mirror 148 that reflects blue light from the blue light source 71 and transmits other wavelength band light including red and green bands.

  The light shielding wheel 331 of the light shielding device 330 is made of a disk-shaped transparent base material that is rotationally driven by a wheel motor 340, and the light tunnel 175 has a rotational axis that coincides with the rotational axis of the fluorescent wheel 101. It is arranged in the vicinity of That is, the light shielding wheel 331 is disposed on the optical path of the light emitted from the fluorescent wheel 101.

  The light shielding wheel 331 has a light shielding region and a transmission region. The light shielding region is a region facing the fluorescent light emitting region of the fluorescent wheel 101 and is formed corresponding to the fluorescent light emitting region. The light shielding region transmits the fluorescent light emitted from the fluorescent light emitting region, and shields the blue light from the blue light source 71 that is diffused and reflected without being converted into fluorescent light in the fluorescent light emitting region. .

  The transmission region is a region facing the diffusion region of the fluorescent wheel 101, and is formed corresponding to the diffusion region. This transmissive region transmits blue light from the blue light source 71 that is diffused and emitted in the diffusion region.

  The light source control means in the projector control means controls the light emission of the blue light source 71 of the blue light source device 70, and the fluorescent wheel 101 and the transmissive area of the light shielding wheel 331 always correspond to the diffusion area of the fluorescent wheel 101. The light shielding wheel 331 is synchronously controlled at the same rotational speed.

  Specifically, the light source control means causes the blue light source 71 to emit light and irradiates the fluorescent light emitting region of the fluorescent wheel 101 with the blue light from the blue light source 71 to emit fluorescent light from the fluorescent light emitting region. The wheel motors 110 and 340 of the fluorescent wheel 101 and the light shielding wheel 331 are controlled so that the light shielding region of the light shielding wheel 331 is positioned on the optical axis of the fluorescent light.

  Further, the light source control means causes the blue light source 71 to emit light, irradiates the blue light from the blue light source 71 to the diffusion region of the fluorescent wheel 101, and emits the blue light from the blue light source 71 as diffusion light from the diffusion region. At this time, the wheel motors 110 and 340 of the fluorescent wheel 101 and the light shielding wheel 331 are controlled so that the transmission region of the light shielding wheel 331 is positioned on the optical axis of the blue diffused light.

  Accordingly, the light source unit 60 can sequentially emit each color diffused light in the red, green, and blue wavelength bands. Then, the DMD that is the display element 51 of the projector 10 displays the light of each color with high color purity according to the data in a time-sharing manner, so that a color image with excellent color balance can be generated on the screen.

  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 and exhaust holes 17. Further, although not shown, an Ir receiver 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. In addition, a plurality of intake holes 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 means, and the light source control circuit 41 is configured so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source unit 60. The blue light source in the blue light source device of the light source unit 60, the wheel motor in the fluorescent light emitting device, and the wheel motor in the light shielding device 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 a blue light source device 70, a fluorescent light emitting device 100, a light source side optical system 140, and a light shielding device 330. The blue light source device 70 is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector housing. The fluorescent light emitting device 100 is disposed in the vicinity of the front panel 12. The light source side optical system 140 guides highly directional light emitted from the blue light source 71 in the blue light source device 70 through the collimator lens 73 to the fluorescent wheel 101 and diffuses it from the fluorescent wheel 101 of the fluorescent light emitting device 100. The emitted diffused light of each color is condensed at the entrance of the light tunnel 175 in the light guide optical system 170 which is a predetermined surface. The light blocking device 330 is disposed on the optical axis of the light beam emitted from the fluorescent wheel 101 and in the vicinity of the light tunnel 175. Details of the light source unit 60 will be described later.

  The optical system unit 160 includes an illumination side block 161 located on the left side of the blue light source device 70, an image generation block 165 located near the position where the back panel 13 and the left panel 15 intersect, and the light source side optical system 140. And the projection side block 168 located between the left side panel 15 and the left side panel 15 are formed 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, the configuration of the light source unit 60 will be described with reference to FIGS. As described above, the light source unit 60 includes the blue light source device 70 having the blue light source 71, the fluorescent light emitting device 100 having the fluorescent wheel 101, the light source side optical system 140, the light shielding device 330 having the light shielding wheel 331, and the projector. And light source control means in the control means.

  As shown in FIG. 3, the blue light source device 70 has a blue light source 71 arranged so that its optical axis is parallel to the rear panel 13, and the optical axis of the light emitted from the blue light source 71 in the direction of the front panel 12. A reflection mirror group 75 that converts 90 degrees, a condenser lens 78 that condenses the light emitted from the blue light source 71 reflected by the reflection mirror group 75, and a heat sink 81 that is disposed between the blue light source 71 and the right panel 14. And comprising.

  The blue light source 71 includes a plurality of laser diodes that emit light in the blue wavelength band arranged in a matrix. On the optical axis of each laser diode, a collimator lens that improves the directivity of light emitted from each laser diode. 73 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 blue light source 71 in one direction and emits the light to the condenser lens 78.

  A cooling fan 261 is disposed between the heat sink 81 and the back panel 13, and the blue 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.

  As shown in FIGS. 3 and 4, the fluorescent light emitting device 100 includes a fluorescent wheel 101 arranged in parallel with the front panel 12, a wheel motor 110 that rotationally drives the fluorescent wheel 101, and a fluorescent wheel 101. And a condensing lens group 111 that condenses the light bundle emitted in the direction of the back panel 13.

  As shown in FIG. 5, the fluorescent wheel 101 is made of a disk-shaped metal substrate and has three segment regions formed by dividing an annular region into three parts. The three segment regions are composed of a red fluorescent light emitting region, a green fluorescent light emitting region, and a diffusion region. The red fluorescent light emitting region is a region where a layer 103R of red phosphor that receives emission light from the blue light source 71 as excitation light and diffuses and emits fluorescent light in the red wavelength band is formed. The green fluorescent light emitting region is a region where a green phosphor layer 103G that receives the emitted light from the blue light source 71 as excitation light and diffuses and emits fluorescent light in the green wavelength band is formed.

  The diffusion region is a region where a diffusion layer 104 that diffuses and emits highly directional blue light emitted from the blue light source device 70 is formed. The diffusion layer 104 is formed of an optical material that imparts a diffusion effect without converting the wavelength band of incident light. Note that the diffusion layer 104 may be formed by applying an optical process such as a roughing process such as blasting to the surface of the base material, in addition to fixing a solid material that is an optical substance.

  In addition, the surface on the blue light source 71 side of the fluorescent wheel 101 in each segment area is mirror-processed by silver vapor deposition or the like to form a reflective surface that reflects light, and the phosphor layer 103 and diffusion are formed on this reflective surface. Layer 104 is laid. 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 and the like are cooled by the cooling fan 261.

  As shown in FIGS. 3 and 4, the light shielding device 330 includes a light shielding wheel 331 disposed so as to face the fluorescent wheel 101 of the fluorescent light emitting device 100, a wheel motor 340 that rotationally drives the light shielding wheel 331, Is provided.

  The light shielding wheel 331 is made of a disk-shaped transparent base material such as light-transmitting glass or resin, and the vicinity of the light tunnel 175 so that the rotational axis of the light shielding wheel 331 coincides with the rotational axis of the fluorescent wheel 101. Placed in. That is, the light shielding wheel 331 is disposed on the optical path of the light emitted from the fluorescent wheel 101.

  The light shielding wheel 331 has a light shielding region and a transmission region. The light shielding region is a region facing the fluorescent light emitting region of the fluorescent wheel 101 and is formed corresponding to the fluorescent light emitting region. Then, as shown in FIG. 6, the light shielding region transmits the fluorescent light emitted from the fluorescent light emitting region, and diffuses and reflects the blue light source 71 without being converted into fluorescent light in the fluorescent light emitting region. Shields blue light from. The light shielding region is formed by a fan-shaped light shielding filter 333 fitted in a circular recess in the transparent substrate.

  The transmission region is a region facing the diffusion region of the fluorescent wheel 101 and is formed corresponding to the diffusion region. This transmissive region transmits blue light from the blue light source 71 that is diffused and emitted in the diffusion region. In addition, this transmission region is formed by a fan-shaped translucent member 334 fitted in a circular recess of the transparent base material. The translucent member 334 is made of light-transmitting glass, resin, or the like, like the transparent base material.

  As shown in FIG. 4, the light source side optical system 140 guides highly directional light emitted from the blue light source 71 of the blue light source device 70 through the collimator lens 73 to the segment area of the fluorescent wheel 101, and The diffused light of each color diffused and emitted from the wheel 101 is configured to be collected at the entrance of the light tunnel 175 in the light guide optical system 170 that is a predetermined surface, and includes a mirror, a condenser lens, and the like.

  Specifically, the reflection mirror 141 reflects the blue wavelength band light on the optical axis of the blue wavelength band light emitted from the blue light source device 70 and converts the optical axis of the blue light by 90 degrees toward the left panel 15. Is arranged.

  Further, the light source side optical system 140 reflects blue light with high directivity from the blue light source 71 to irradiate the fluorescent wheel 101, and diffuses each color of red, green, and blue bands emitted from the fluorescent wheel 101. It has a light guide member 130 that transmits light. The light guide member 130 is disposed at a position where the optical axis of the blue light reflected by the reflecting mirror 141 and the extension line of the central axis of the light tunnel 175 intersect.

  The light guide member 130 is formed in a part of the center of the diffused light transmitting member 149 that transmits each color diffused light and the diffused light transmitting member 149 on the optical axis of the highly directional blue light emitted from the blue light source 71. And a reflecting portion. The diffused light transmitting member 149 is formed of light-transmitting glass or resin. The reflection unit converts the optical axis of the blue light from the blue light source 71 by 90 degrees in the direction of the front panel 12 to reflect the blue light and includes red light and green light emitted from the fluorescent wheel 101. The blue reflection dichroic mirror 148 transmits the light in the wavelength band.

  In addition, the light guide member 130 is fitted and held with a blue reflective dichroic mirror 148 formed in the minimum size necessary for reflecting the highly directional blue laser light at the center of the diffused light transmitting member 149. It is supposed to be configured.

  The reflection part may be a reflection mirror that reflects visible light because it is a small part of the central part of the light guide member 130. However, the reflection part may be a blue reflection dichroic mirror 148 to emit from the fluorescent wheel 101. Of the fluorescent light to be emitted, fluorescent light in the vicinity of the optical axis is also preferable because it can be used as light source light.

  Furthermore, the blue reflecting dichroic mirror 148 and the diffused light transmitting member 149 may be formed as a light guiding member 130 by applying dichroic coating to a part of the center of the plate-like glass material, without using separate members.

  Further, in the light source side optical system 140, a condenser lens is disposed between the reflecting mirror 141 and the blue reflecting dichroic mirror 148. A condensing lens 173 that condenses the light from the fluorescent wheel 101 is disposed at the entrance of the light tunnel 175 between the blue reflecting dichroic mirror 148 and the light tunnel 175.

  The light source control means in the projector control means controls the light emission of the blue light source 71 of the blue light source device 70, and the fluorescent wheel 101 and the transmissive area of the light shielding wheel 331 always correspond to the diffusion area of the fluorescent wheel 101. By performing synchronous rotation control of the light shielding wheel 331 at the same rotational speed, light in the red, green, and blue wavelength bands is sequentially emitted from the light source unit 60.

  Specifically, the light source control means causes the blue light source 71 to emit light and irradiates the phosphor layer 103 in the fluorescent light emitting region of the fluorescent wheel 101 with the highly directional blue light emitted from the blue light source 71. When emitting fluorescent light from the fluorescent light emitting region, the wheel motors 110 and 340 of the fluorescent wheel 101 and the light shielding wheel 331 are controlled so that the light shielding region (light shielding filter 333) of the light shielding wheel 331 is positioned on the optical axis of the fluorescent light. To do.

  Further, the light source control means causes the blue light source 71 to emit light and irradiate the diffusion region (the diffusion layer 104) of the fluorescent wheel 101 with the highly directional blue light emitted from the blue light source 71. Wheel motors of the fluorescent wheel 101 and the light shielding wheel 331 are arranged so that the transmission region (translucent member 334) of the light shielding wheel 331 is positioned on the optical axis of the blue diffused light when the blue light is emitted from the diffusion region as diffused light. 110,340 is controlled.

  Accordingly, the highly directional blue light emitted from the blue light source device 70 is 90 degrees converted by the reflecting mirror 141 and reflected to the left panel 15 side, and the blue reflecting dichroic mirror at the center of the light guide member 130 is reflected. Incident on 148. Then, the highly directional blue light incident on the blue reflecting dichroic mirror 148 is changed in direction by 90 degrees by the blue reflecting dichroic mirror 148, reflected to the front panel 12 side, and irradiated to the fluorescent wheel 101.

  When blue light is incident on the fluorescent wheel 101 and the incident surface is a fluorescent light emitting region, the highly directional blue light incident on the fluorescent wheel 101 excites the phosphor in the phosphor layer 103. Then, the fluorescent light emitted from the phosphor so as to diffuse in all directions is directly emitted to the light tunnel 175 side or after being reflected by the reflection surface of the fluorescent wheel 101 to the light tunnel 175 side.

  In addition, the excitation light irradiated on the metal substrate without being absorbed by the phosphor of the phosphor layer 103 is reflected by the reflecting surface and is incident on the phosphor layer 103 again to excite the phosphor. . Therefore, by using the surface of the concave portion of the fluorescent wheel 101 as a reflective surface, the utilization efficiency of the excitation light emitted from the blue light source 71 can be increased and light can be emitted more brightly.

  Then, the blue light reflected on the light tunnel 175 side so as to diffuse without being absorbed by the phosphor (that is, without being converted in wavelength) in the fluorescent light emitting region of the fluorescent wheel 101 is reflected in the light guide member 130. The light transmitted through the diffused light transmitting member 149 is also blocked by the light blocking wheel 331.

  Specifically, since the light shielding wheel 331 and the fluorescent wheel 101 rotate synchronously, when the light from the blue light source 71 is irradiated to the fluorescent light emitting region, the light shielding wheel 331 is located at a position facing the fluorescent light emitting region. Since the light shielding region (light shielding filter 333) is located, the blue light emitted mixed with the fluorescent light emitted from the fluorescent light emitting region is shielded by the light shielding region, and only the fluorescent light is transmitted. Therefore, it is possible to prevent the blue light from entering the light guide optical system 170 when the fluorescent light is emitted, and to use red and green fluorescent lights with high color purity as the light source light.

  In addition, when blue light is incident on the fluorescent wheel 101, if the incident surface is a diffusion region, the highly directional blue light incident on the fluorescent wheel 101 is diffused and emitted by the diffusion layer 104. The diffused light beam in the blue wavelength band is reflected by the central portion of the light beam by the blue reflecting dichroic mirror 148 of the light guide member 130. However, this portion has high directivity as described above. Therefore, most of the blue diffused light passes through the diffused light transmitting member 149, is collected by the condenser lens 173, and enters the entrance of the light tunnel 175. It will be.

  When the light from the blue light source 71 is irradiated to the diffusion region, the transmission region (translucent member 334) of the light shielding wheel 331 is positioned at a position facing the diffusion region (diffusion layer 104), and therefore, blue Diffused light is not shielded by the shading wheel 331.

  Therefore, the light source unit 60 sequentially emits each color diffused light in the red, green, and blue wavelength bands. Then, the DMD that is the display element 51 of the projector 10 displays the light of each color with high color purity according to the data in a time-sharing manner, so that a color image with excellent color balance can be generated on the screen. That is, according to the present invention, the light source unit 60 is capable of emitting fluorescent light having high color purity as light source light by preventing mixing of excitation light, and generates light of three primary colors of red, green, and blue. It is possible to provide the light source unit 60 that can be used, and the projector 10 that can improve the color reproducibility of the projected image by including the light source unit 60.

  Further, the light source side optical system 140 includes a light guide member 130 including a diffused light transmitting member 149 and a reflecting portion provided at the center of the diffused light transmitting member 149, so that incident excitation light is reflected and fluorescent. The wheel 101 can be irradiated and diffused light of each color from the fluorescent wheel 101 can be transmitted and guided to the light tunnel 175 of the light guide optical system 170.

  Further, in the present embodiment, the fluorescent wheel 101 and the light shielding wheel 331 are arranged so that the rotation axes of both the wheels 101 and 331 coincide with each other, so that the light source side optical system 140 can be made a simple layout. The light source unit 60 having excellent assemblability can be mounted on the projector 10.

  In the present embodiment, the driving device for the fluorescent wheel 101 and the light shielding wheel 331 employs wheel motors 110 and 340, respectively, and both the wheel motors 110 and 340 are controlled by the light source control means. Without being limited thereto, the fluorescent wheel 101 and the light shielding wheel 331 may be coupled by a common shaft, and any one of the wheel motors 110 and 340 may be omitted. In this case, the omitted shafts of the wheels 101 and 331 are held by bearings. Further, it is preferable that the fluorescent wheel 101 and the light shielding wheel 331 are arranged on the left panel 15 side symmetrical with respect to the central axis of the light tunnel 175 so that the effective light beam is not blocked.

  Next, another embodiment of the light source unit 60 according to the present embodiment will be described with reference to FIG. The light source unit 60 has substantially the same configuration as the light source unit 60 according to the above-described embodiment, but the fluorescent light emitting device 100 is arranged on the optical axis of the blue wavelength band light emitted from the blue light source device 70. Yes.

  The light source side optical system 140 in the light source unit 60 is configured such that the light guide member 130 is disposed on the optical axis of the blue wavelength band light emitted from the blue light source device 70. The light guide member 130 transmits blue light with a high directivity emitted from the blue light source device 70 to irradiate the fluorescent wheel 101, and reflects diffused light emitted from the fluorescent wheel 101. is there.

  Specifically, the light guide member 130 includes a diffused light reflecting member 151 that reflects each of the red, green, and blue color diffused light from the fluorescent wheel 101, and blue laser light having high directivity from the blue light source device 70. And a transmission part formed at a part of the center of the diffused light reflecting member 151 on the optical axis.

  This transmissive part is a blue transmissive dichroic mirror 150 that is fitted and fixed to a through hole provided in the center of the diffused light reflecting member 151. The transmissive dichroic mirror 150, which is the transmissive part, transmits the blue light from the blue light source 71 and reflects the other wavelength band light including the red and green wavelength band light from the fluorescent wheel 101 to thereby reflect the red and red light. The optical axis of green light is converted by 90 degrees toward the left panel 15.

  The transmission part may be a glass or the like that transmits visible light because it is a small part of the central part of the light guide member 130, but the reflection part is emitted from the fluorescent wheel 101 by using the blue transmission dichroic mirror 150. Of the fluorescent light to be emitted, fluorescent light in the vicinity of the optical axis is also preferable because it can be used as light source light.

  Further, the light source side optical system 140 reflects each color light on the optical axis of each color wavelength band light emitted from the fluorescent wheel 101 and reflected by the light guide member 130, and converts the optical axis of each color light to the rear panel. A reflecting mirror 159 that converts 90 degrees in 13 directions is arranged.

  Therefore, the highly directional blue light emitted from the blue light source device 70 passes through the blue transmissive dichroic mirror 150 that is a part of the center of the light guide member 130 and is irradiated on the fluorescent wheel 101.

  When blue light enters the fluorescent wheel 101, if the incident surface is a red or green fluorescent light emitting region, red fluorescent light or green fluorescent light is emitted from the red or green fluorescent light emitting region to the blue light source device 70 side. The Then, the red and green fluorescent lights are reflected by the light guide member 130, are further reflected by the reflection mirror 159, and are emitted to the light tunnel 175 side.

  Then, the blue light reflected to the blue light source device 70 so as to diffuse without being absorbed by the phosphor (that is, without being converted in wavelength) in the fluorescent light emitting region of the fluorescent wheel 101 is reflected by the light guide member 130. The blue light that is reflected by the diffused light reflecting member 151 but subsequently reflected by the reflecting mirror 159 is blocked by the light blocking region of the light blocking wheel 331. Therefore, it is possible to prevent the blue light from entering the light guide optical system 170 when the fluorescent light is emitted, and to use red and green fluorescent lights with high color purity as the light source light.

  In addition, when blue light is incident on the fluorescent wheel 101, if the incident surface is a diffusion region, the highly directional blue light incident on the fluorescent wheel 101 is diffused and emitted by the diffusion layer 104. The diffused light beam in the blue wavelength band is transmitted through the central part of the light beam by the blue transmitting dichroic mirror 150 of the light guide member 130. This part transmits blue laser light with high directivity. Therefore, most of the blue diffused light is reflected by the diffused light reflecting member 151 and then reflected by the reflecting mirror 159, and is collected by the condenser lens and is incident on the light tunnel 175. It will enter into.

  As described above, the light source unit 60 includes the light guide member 130 including the diffused light reflecting member 151 and the transmissive portion provided at the center of the diffused light reflecting member 151 in the light source side optical system 140. The excitation light to be transmitted can be transmitted to irradiate the fluorescent wheel 101, and the diffused light of each color from the fluorescent wheel 101 can be reflected and guided to the light tunnel 175 of the light guide optical system 170. In another embodiment of the present embodiment, as described above, it is possible to emit red and green fluorescent light and blue diffused light with high color purity, in which mixing of colors is prevented without mixing excitation light, as light source light. It is possible to provide the light source unit 60 and the projector 10 that can improve the color reproducibility of the projected image by including the light source unit 60.

  Next, a light source unit 60 according to a modification of the present invention will be described with reference to FIGS. FIG. 8 is a schematic plan view of a light source unit 60 according to this modification. FIGS. 9A and 9B are schematic front views of the fluorescent wheel 101 and the light shielding wheel 331 according to this modification. . The light source unit 60 has substantially the same configuration as the light source unit 60 according to another embodiment described above, but the red light source device 120 is disposed between the blue light source device 70 and the fluorescent light emitting device 100. .

  The red light source device 120 includes a red light source 121 disposed so that the optical axis is parallel to the blue 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 arranged so that the light axis from the blue light source device 70 and the light emitted from the fluorescent wheel 101 intersect with the optical axis. The red light source 121 includes a red light emitting diode that emits red wavelength band light.

  As shown in FIG. 9A, the fluorescent wheel 101 is formed with two equally divided segment regions, one of which is a green fluorescent light emitting region where the green phosphor layer 103G is formed, and the other is A diffusion region in which the diffusion layer 104 is formed is formed. As shown in FIG. 9B, the light shielding wheel 331 formed corresponding to this has a semicircular light shielding region (light shielding filter 333) and a transmission region (translucent member 334).

  In addition, the light source side optical system 140 in the light source unit 60 is configured such that the diffused light emitted from the fluorescent wheel 101 and the light in the red wavelength band emitted from the red light source 121 are incident on the light tunnel 175 that is a predetermined surface. It is set as the structure which condenses to. Further, the light source side optical system 140 is located at a position where the optical axis of the blue wavelength band light emitted from the blue light source device 70 and the optical axis of the red wavelength band light emitted from the red light source device 120 intersect. The light guide member 130 is arranged. The light guiding member 130 transmits blue light having a high directivity emitted from the blue light source device 70 to irradiate the fluorescent wheel 101, and reflects diffused light emitted from the fluorescent wheel 101. is there.

  Specifically, the light guide member 130 includes a red transmissive dichroic mirror 156 that reflects green and blue diffused light from the fluorescent wheel 101 and transmits red light from the red light source 121, and the blue light source device 70. And a transmissive portion formed at a part of the center of the red transmissive dichroic mirror 156 on the optical axis of the highly directional blue laser light.

  This transmissive portion is a green reflective dichroic mirror 155 that is fitted and fixed to a through-hole formed in the center of the red transmissive dichroic mirror 156. The green reflection dichroic mirror 155 that is the transmission part transmits the blue light from the blue light source 71 and the red light from the red light source 121, and transmits other wavelength band light including the green wavelength band light from the fluorescent wheel 101. Reflecting and converting the optical axis of this green light by 90 degrees toward the left panel 15.

  The green reflection dichroic mirror 155 and the red transmission dichroic mirror 156 are not separate members, but reflect green band light to a part of the center of the plate-like glass material and transmit other wavelength band light. The light guide member 130 may be formed by applying a dichroic coating and applying a red transmissive dichroic coating that transmits red band light and reflects other wavelength band light to many other portions.

  The light source side optical system 140 reflects each color light at a position where the optical axis of the red wavelength band light emitted from the red light source device 120 and the extension line of the central axis of the light tunnel 175 intersect. A reflection mirror 159 for converting the optical axis of each color light by 90 degrees in the direction of the back panel 13 is disposed.

  Therefore, the highly directional blue light emitted from the blue light source device 70 passes through the green reflecting dichroic mirror 155 that is a part of the center of the light guide member 130 and is applied to the fluorescent wheel 101.

  When blue light enters the fluorescent wheel 101, if the incident surface is a green fluorescent light emitting region, green fluorescent light is emitted from the green fluorescent light emitting region to the blue light source device 70 side. The green fluorescent light is reflected by the light guide member 130, is further reflected by the reflecting mirror 159, and is emitted toward the light tunnel 175.

  Then, the blue light reflected to the blue light source device 70 so as to diffuse without being absorbed by the phosphor (that is, without being converted in wavelength) in the fluorescent light emitting region of the fluorescent wheel 101 is reflected by the light guide member 130. The blue light that is reflected by the red transmissive dichroic mirror 156 and then reflected by the reflecting mirror 159 is shielded by the light shielding region of the light shielding wheel 331. Therefore, it is possible to prevent blue light from entering the light guide optical system 170 when the fluorescent light is emitted, and to use green fluorescent light with high color purity as light source light.

  In addition, when blue light is incident on the fluorescent wheel 101, if the incident surface is a diffusion region, the highly directional blue light incident on the fluorescent wheel 101 is diffused and emitted by the diffusion layer 104. The diffused light beam in the blue wavelength band is transmitted through the central portion of the light beam by the green reflecting dichroic mirror 155 of the light guide member 130, but this portion transmits blue laser light with high directivity. Therefore, most of the blue diffused light is reflected by the red transmissive dichroic mirror 156, then reflected by the reflecting mirror 159, and collected by the condenser lens to be incident on the light tunnel 175. It will enter into.

  Then, the light source control means in the projector control means according to the present modification is arranged so that the blue laser light irradiation area is positioned so as to straddle the two segment areas at one of the boundaries of the two segment areas of the fluorescent wheel 101. Control to turn off the light source 71 and turn on the red light source 121 is performed. That is, only the red wavelength band light from the red light source 121 is emitted from the light source unit 60 by turning on the red light source 121 when turning off the blue light source 71 so as to include a period of passing through the boundary between the two segment regions. be able to. The red light is transmitted through the light guide member 130 (the green reflecting dichroic mirror 155 and the red transmitting dichroic mirror 156), then reflected by the reflecting mirror 159, and incident on the incident light of the light tunnel 175.

  Therefore, in this modification as well, as described above, green fluorescent light with high color purity in which excitation light is not mixed and color mixing is prevented, red light from the red light source device 120 that is a monochromatic light source device, and blue diffusion It is possible to provide a light source unit 60 that can emit light as light source light, and a projector 10 that can improve the color reproducibility of a projected image by including the light source unit 60.

  The present invention is not limited to the above embodiments, and can be freely changed and improved without departing from the gist of the invention. For example, the layout of each optical component is not limited to the above-described configuration (see FIGS. 4, 7, and 8), and various layouts can be adopted. Further, the light source control means may be provided individually in the light source unit 60 without being provided in the projector 10.

  Further, the light with high directivity emitted from the blue light source 71 may be directly irradiated onto the phosphor layer 103 of the fluorescent wheel 101 without using a mirror. Thereby, a mirror can be omitted. Specifically, if the fluorescent wheel 101 is formed of a transparent base material, the emitted light from the blue light source 71 is directly irradiated from the back side (surface opposite to the light shielding wheel 331 side) of the fluorescent wheel 101. Good. That is, when the phosphor layer 103 in the fluorescent wheel 101 is irradiated with the emitted light from the blue light source 71, the leakage light from the blue light source 71 that diffuses and transmits without being excited by the phosphor may be generated. By shielding the leakage light with the light shielding wheel 331 as described above, green light and red light with high color purity can be obtained. Alternatively, light from the blue light source 71 may be incident obliquely from the front side of the fluorescent wheel 101.

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 Blue light source device
71 Blue light source 73 Collimator lens
75 Reflective mirror group 78 Condensing lens
81 Heat sink 100 Fluorescent light emitting device
101 Fluorescent wheel 103 Phosphor layer
103G Green phosphor layer 103R Red phosphor layer
104 Diffusion layer
110 Wheel motor 111 Condensing lens group
120 Red light source 121 Red light source
125 Condenser lens group 130 Light guide member
140 Light source side optical system 141 Reflection mirror
148 Blue reflective dichroic mirror 149 Diffuse light transmitting member
150 Blue transmissive dichroic mirror 151 Diffuse light reflecting member
155 Green reflective dichroic mirror 156 Red transmissive dichroic mirror
159 Reflective 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 330 Shading device
331 Shading wheel 333 Shading filter
334 Translucent member 340 Wheel motor

Claims (13)

A rotation-controllable fluorescent wheel having a plurality of segment regions;
A light source that irradiates the segment area of the fluorescent wheel with light;
A rotation-controllable shading wheel disposed on the optical path of light emitted from the fluorescent wheel;
A light source control means for controlling the light emission of the light source,
The fluorescent wheel has a fluorescent light emitting region and a diffusion region, and the fluorescent light emitting region is a segment region that receives light from the light source and emits light of a predetermined wavelength band, and the diffusion region is the light source It is a segment area that diffuses and emits light from
The light shielding wheel has a light shielding region and a transmission region, the light shielding region is formed corresponding to the fluorescent light emitting region of the fluorescent wheel, and transmits fluorescent light emitted from the fluorescent light emitting region, and The light from the light source diffused without being converted into fluorescent light in the fluorescent light emitting region is shielded, and the transmission region is formed corresponding to the diffusion region of the fluorescent wheel, and diffuses in the diffusion region And the light from the light source emitted is transmitted,
The light source control unit controls the rotation of the fluorescent wheel and the light shielding wheel at the same rotational speed so that the diffusion region of the fluorescent wheel and the transmission region of the light shielding wheel always correspond to each other. A light source side optical system that guides the highly directional light emitted from the light source to the fluorescent wheel and condenses the diffused light that is diffused and emitted from the fluorescent wheel on a predetermined surface,
The light source side optical system includes a light guide member that reflects the light with high directivity and irradiates the fluorescent wheel, and transmits the diffused light.
The light guide member includes a diffused light transmitting member that transmits the diffused light, and a reflection portion that is formed at a part of the center of the diffused light transmitting member on the optical axis of the highly directional light. The light source unit according to claim 1, wherein:   The light source unit according to claim 2, wherein the reflection unit is a dichroic mirror that reflects light from the light source and transmits other wavelength band light. A light source side optical system that guides the highly directional light emitted from the light source to the fluorescent wheel and condenses the diffused light that is diffused and emitted from the fluorescent wheel on a predetermined surface,
The light source side optical system includes a light guide member that transmits the light with high directivity and irradiates the fluorescent wheel, and reflects the diffused light,
The light guide member includes a diffused light reflecting member that reflects the diffused light, and a transmission part that is formed at a part of the center of the diffused light reflecting member on the optical axis of the highly directional light. The light source unit according to claim 1, wherein:   The light source unit according to claim 4, wherein the transmission unit is a dichroic mirror that transmits light from the light source and reflects other wavelength band light.   The light source unit according to any one of claims 1 to 5, wherein the light source includes a laser diode that emits light in a blue wavelength band.   7. A phosphor layer that emits light in a green wavelength band upon receiving light from the light source is formed in at least one of the fluorescent light emitting regions of the fluorescent wheel. The light source unit according to any one of the above.   8. A phosphor layer that emits light in a red wavelength band upon receiving light from the light source is formed in at least one of the fluorescent light emitting regions of the fluorescent wheel. The light source unit according to any one of the above. A red light source having a light emitting diode emitting light in the red wavelength band;
The said light source side optical system condenses the diffused light inject | emitted from the said fluorescence wheel, and the light of the red wavelength range | band inject | emitted from the said red light source on a predetermined surface. The light source unit according to claim 7.   The said fluorescent wheel and the said light shielding wheel are arrange | positioned so that the rotating shaft of the said fluorescent wheel and the rotating shaft of the said light shielding wheel may correspond, The Claim 1 thru | or 9 characterized by the above-mentioned. Light source unit.   The light source unit according to any one of claims 1 to 10, wherein the light source control means synchronously controls the fluorescent wheel and the light shielding wheel.   The light source unit according to claim 10, wherein the fluorescent wheel and the light shielding wheel are rotationally driven by the same driving device. The light source unit according to any one of claims 1 to 12, a display element, a light guide optical system that guides light from the light source unit to the display element, and an image emitted from the display element. A projection-side optical system that projects onto a screen, projector control means for controlling the light source unit and the display element,
A projector comprising:

Images