JP2012037681A - Light source unit and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple light source unit capable of improving luminance.SOLUTION: A light source unit 60 includes: a fluorescent wheel 101 with a fluorescent light emitting section formed with a layer of a fluorescent body of green fluorescent light on a light reflecting surface and a diffusion transmitting section; a first light source 71 of blue exciting light; a second light source 121 of red light; a light guide optical system 140 for guiding respective color light beams emitted from the fluorescent wheel 101; and light source control means for controlling light emission of the first light source 71 and the second light source 121. The fluorescent wheel 101 is arranged on a light path of the first light source 71 and the second light source 121. A dichroic surface 1a transmitting light from the first light source 71 and reflecting light from the second light source 121 or reflecting light from the first light source 71 and transmitting light from the second light source 121 is arranged at a position where an optical axis of the first light source 71 intersects with an optical axis of the second light source 121. The fluorescent light emitting section and the diffusion transmitting section of the fluorescent wheel 101 can be irradiated with light from the first light source 71 and the second light source 121.

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 condenses light emitted from a light source on a display element such as a 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. However, in recent years, there have been many proposals using light emitting diodes, laser diodes, organic EL, phosphor light emission, etc. as the light source. ing. For example, in Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 1), a solid light source as an excitation light source and a phosphor layer that receives ultraviolet light as excitation light emitted from the solid light source and converts it into visible light are arranged. There has been proposed a light source unit having a fluorescent wheel made of a disc-shaped transparent substrate.

JP 2004-341105 A

  The proposal of Patent Document 1 can irradiate the phosphor layer formed on the wheel surface with ultraviolet light as excitation light to emit fluorescent light in the red, green, and blue wavelength bands. Since the efficiency is lower than the luminous efficiency of the other phosphors, there is a problem that the red luminance is insufficient when the arrangement ratio of the phosphor layers in the wheel circumferential direction is made approximately the same.

  The present invention has been made in view of such problems of the prior art, and includes a light source that excites a phosphor, a phosphor plate having a phosphor with a good luminous efficiency, and a type with a relatively low luminous efficiency. A monochromatic light source that emits light in a wavelength band corresponding to the phosphor of the above, and a light source unit that can improve the brightness of the screen, and a projector including the light source unit. Yes.

  The light source unit of the present invention emits light in a wavelength band that can excite the phosphor, and a fluorescent plate having a fluorescent light emitting part on which a phosphor layer is formed, a diffuse transmission part that diffuses and transmits light. A first light source that emits light, a second light source that emits light in a wavelength band different from the light emitted from the phosphor and the light emitted from the first light source, and each color wavelength band light emitted from the fluorescent plate A light guide optical system that guides light to a predetermined surface, and a light source control unit that individually controls light emission of the first light source and the second light source, and reflects light to the fluorescent light emitting unit of the fluorescent plate. A reflecting surface is formed, a phosphor layer is formed on the reflecting surface, and the fluorescent plate is disposed on an optical path of the first light source and the second light source, and the optical axis of the first light source and the first light source Transmits light emitted from the first light source at a position where the optical axes of the two light sources intersect A dichroic surface that reflects the light emitted from the second light source or reflects the light emitted from the first light source and transmits the light emitted from the second light source; And the light inject | emitted from a 2nd light source can be irradiated to the fluorescence light emission part and the diffuse transmission part of the said fluorescent plate, It is characterized by the above-mentioned.

  In the light source unit of the present invention, the light guide optical system is disposed on an optical path of fluorescent light emitted from the fluorescent plate or light emitted from the first light source and the second light source diffused and transmitted through the fluorescent plate. A dichroic surface configured to transmit a light emitted from the first light source and the second light source and reflect a fluorescent light emitted from a phosphor of the fluorescent plate. However, it is preferable to arrange | position between said 1st light source and 2nd light source, and said fluorescent plate.

  Furthermore, in the light source unit of the present invention, the light guide optical system is disposed between the first light source and the second light source and the fluorescent plate, and changes the direction of the optical axis of the light emitted from the light source. And a first optical axis conversion member having a dichroic surface that changes the direction of the optical axis of the fluorescent light emitted from the fluorescent light emitting section, the first light source that transmits the diffuse transmission section of the fluorescent plate, and the first light source A dichroic mirror or a normal reflection mirror that changes the direction of the optical axis of light emitted from two light sources, or the fluorescent plate without changing the direction of the optical axis of light emitted from the first light source and the second light source. A second optical axis conversion member that is a dichroic mirror that converts the optical axis of fluorescent light emitted from the fluorescent light emitting section; and the optical axis of the fluorescent light converted by the first optical axis conversion member and the second optical axis conversion member Strange The third optical axis conversion that guides the light of each color wavelength band emitted from the fluorescent plate to the same optical path directed in the same direction by further converting the optical axis of the light emitted from the first light source and the second light source. It is preferable to include a member and a fourth optical axis conversion member.

  In the light source unit of the present invention, the first optical axis conversion member is disposed between the fluorescent plate and the light source on an optical path of light emitted from the first light source and the second light source. The two optical axis conversion member is disposed at a position opposite to the light source with respect to the fluorescent plate on an optical path of light emitted from the first light source and the second light source, and the third optical axis conversion member is The first light source converted by the second optical axis conversion member and the optical axis of the light emitted from the second light source, and the fourth optical axis conversion member is formed by the first optical axis conversion member. The position where the optical axis of the fluorescent light emitted from the fluorescent light emitting part to be converted intersects the optical axis of the light emitted from the first light source and the second light source converted by the third optical axis conversion member It is more preferable that they are arranged in the.

  In the light source unit of the present invention, the first optical axis conversion member can be a dichroic prism.

  In the light source unit of the present invention, the first optical axis conversion member may be a dichroic mirror.

  Furthermore, in the light source unit of the present invention, the second to fourth optical axis conversion members include two reflecting mirrors that convert the optical axes of light or fluorescent light emitted from the first light source and the second light source, One dichroic mirror that converts the optical axis of the light emitted from the first light source and the second light source and the optical axis of the fluorescent light emitted from the fluorescent light emitting unit without converting one of them. And can be configured.

  In the light source unit of the present invention, the second to fourth optical axis conversion members may be three reflecting mirrors that convert the optical axis of light by 90 degrees.

  Further, in the light source unit of the present invention, the fluorescent plate is a fluorescent wheel made of a disk-like base material that is rotationally driven by a wheel motor, and the fluorescent light emitting portion and the diffuse transmission portion are arranged in parallel in the circumferential direction. It is preferable.

  The first light source is a laser emitter that emits light in a blue wavelength band, the second light source is a laser emitter that emits light in a red wavelength band, and the phosphor is excited from the first light source. A phosphor that emits fluorescent light in the green wavelength band upon receiving light can be obtained.

  The projector of the present invention projects the light source unit, the display element, the light source side optical system that condenses the light from the light source unit onto the display element, and the image emitted from the display element on the screen. And a projector control means for controlling the light source unit and the display element.

  According to the present invention, a light source that excites a phosphor, a fluorescent plate having a type of phosphor with good emission efficiency, a monochromatic light source that emits light in a wavelength band corresponding to a type of phosphor with relatively low emission efficiency, and By providing the above, it is possible to provide a light source unit capable of improving the luminance of the screen and a projector including the light source unit.

  The fluorescent plate of the light source unit is formed with a fluorescent light emitting portion and a diffuse transmission portion. The fluorescent plate is irradiated with excitation light from the first light source and monochromatic light from the second light source, so that a plurality of colors can be obtained. Therefore, it is possible to provide a light source unit having a simple configuration and a small projector 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 block diagram of the projector which concerns on the Example of this invention. It is a functional 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 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 a schematic diagram which shows the variation of the optical layout in a light source unit. It is a table | surface which shows the example of a combination of the optical axis conversion member in a light source unit. It is a schematic diagram which shows the optical layout in a light source unit. It is a schematic diagram which shows the optical layout in a light source unit. It is a schematic diagram which shows the optical layout in a light source unit. It is a schematic diagram which shows the optical layout in a light source unit.

  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 source side optical system 170 that focuses light from the light source unit 60 on 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 projector control means includes light source control means for individually controlling light emission of the first light source 71 and the second light source 121 in the light source unit 60.

  The light source unit 60 includes a blue light source device 70, a fluorescent light emitting device 100, a red light source device 120, and a light guide optical system 140. The blue light source device 70 includes a plurality of first light sources 71 that are laser emitters that emit light in the blue wavelength band. The red light source device 120 includes a plurality of second light sources 121 that are laser light emitters that emit light in the red wavelength band.

  The fluorescent light emitting device 100 includes a fluorescent wheel 101 made of a disk-shaped base material, and a wheel motor 110 that rotationally drives the fluorescent wheel 101. The disc-shaped fluorescent wheel 101 has a diffuse transmission part 104 that diffuses and transmits the light emitted from the first light source 71 and the second light source 121, and receives the emitted light from the first light source 71 as excitation light and emits green light. A fluorescent light emitting unit 103 having a green phosphor layer that emits fluorescent light in a wavelength band is arranged in parallel in the circumferential direction. The fluorescent light emitting unit 103 is formed with a reflective surface that reflects light, and a fluorescent layer that emits fluorescent light upon receiving excitation light is formed on the reflective surface.

  The fluorescent wheel 101 is disposed on the optical path of the first light source 71 and the second light source 121. Further, the light source control unit individually controls the light emission of the first light source 71 and the second light source 121, so that the first light source 71 and the second light source 121 are connected to the diffuse transmission part 104 of the rotating fluorescent wheel 101 and the fluorescent light emission. The unit 103 can be irradiated with laser light. The second light source 121 only needs to be able to irradiate the laser beam of the red wavelength band only to the diffuse transmission part 104 of the rotating fluorescent wheel 101. Therefore, the light source control means diffuses and transmits the light from the second light source 121. The light emission of the second light source 121 is controlled so that the unit 104 is irradiated.

  As a result, when the laser beam in the blue wavelength band is irradiated to the diffuse transmission part 104 of the rotating fluorescent wheel 101, the light in the blue wavelength band is diffused and transmitted, and the laser beam in the blue wavelength band is irradiated to the fluorescent light emitting part 103. Sometimes green fluorescent light is emitted from the green phosphor. Further, when the laser beam in the red wavelength band is irradiated to the diffuse transmission part 104 of the rotating fluorescent wheel 101, the light in the red wavelength band is diffused and transmitted.

  That is, the fluorescent wheel 101 is irradiated with the laser light from the first light source 71 or the second light source 121 to the rotating fluorescent wheel 101, so that the fluorescent light emitting unit 103 has a blue wavelength band from the first light source 71. Fluorescent light in the green wavelength band is emitted by receiving the laser light as excitation light, and this blue light is diffused and emitted by receiving the laser light in the blue wavelength band from the first light source 71 to the diffuse transmission part 104, By receiving laser light in the red wavelength band from the second light source 121 in the diffuse transmission part 104, the red light is diffused and emitted, that is, functions as a fluorescent plate capable of emitting light in the three primary color wavelength bands.

  The light guide optical system 140 is configured to guide the light in the red, green, and blue wavelength bands emitted from the fluorescent wheel 101 of the fluorescent light emitting device 100 to the entrance of the light tunnel 175 that is a predetermined surface. . The light guide optical system 140 includes a first optical axis conversion member 1, a second optical axis conversion member 2, a third optical axis conversion member 3, a fourth optical axis conversion member 4, and a plurality of lenses. Composed.

  The first optical axis conversion member 1 is a cross dichroic disposed between the first light source 71 and the second light source 121 and the fluorescent wheel 101 on the optical path of the light emitted from the first light source 71 and the second light source 121. It is a prism. The first optical axis conversion member 1 transmits the light emitted from the first light source 71 to the position where the optical axis of the first light source 71 and the optical axis of the second light source 121 intersect, and emits the light from the second light source 121. It has a dichroic surface 1a that reflects the emitted light. The first optical axis converting member 1 is emitted from the first light source 71 and the second light source 121 without changing the direction of the optical axis of the light emitted from the first light source 71 and the second light source 121. A dichroic surface 1b that reflects the fluorescent light so as to transmit light and change the direction of the optical axis of the fluorescent light emitted from the fluorescent light emitting unit 103 is provided.

  The second optical axis conversion member 2 is located on the opposite side of the fluorescent light wheel 101 from the first light source 71 and the second light source 121 on the optical path of the light emitted from the first light source 71 and the second light source 121. Be placed. The second optical axis conversion member 2 includes a normal reflection mirror that converts the direction of the optical axis of the light emitted from the first light source 71 and the second light source 121 transmitted through the diffusing and transmitting portion 104 of the fluorescent wheel 101 by 90 degrees. Is done.

  The third optical axis conversion member 3 is disposed on the optical axis of the light emitted from the first light source 71 and the second light source 121 converted by the second optical axis conversion member 2, and converts the optical axis by 90 degrees. A normal reflection mirror is used.

  The fourth optical axis conversion member 4 includes an optical axis of fluorescent light emitted from the fluorescent light emitting unit 103 converted by the first optical axis conversion member 1, and a first light source 71 converted by the third optical axis conversion member 3. And the optical axis of the light emitted from the second light source 121 is arranged at a position where it intersects. The fourth optical axis conversion member 4 does not change the direction of the optical axis of the light emitted from the first light source 71 and the second light source 121 converted by the third optical axis conversion member 3, and The optical axis of the fluorescent light converted by the single optical axis conversion member 1 is a dichroic mirror that converts the direction of the optical axis by 90 degrees.

  That is, the third optical axis conversion member 3 and the fourth optical axis conversion member 4 are the first light source converted by the optical axis of the fluorescent light converted by the first optical axis conversion member 1 or the second optical axis conversion member 2. By further converting the optical axis of the light emitted from 71 and the second light source 121, each color wavelength band light emitted from the fluorescent wheel 101 can be guided to the same optical path directed in the same direction.

  Each color light guided to the light tunnel 175 is condensed on the display element 51 by the light source side optical system 170 in the optical system unit 160 and projected onto the screen by the projection side optical system 220.

  That is, in the light source unit 60, the light source control unit in the projector control unit executes control for causing the first light source 71 and the second light source 121 to emit light individually, so that the red, green, and red light from the light source unit 60 in one frame. Monochromatic light in the blue wavelength band can be individually emitted. Then, the DMD that is the display element 51 of the projector 10 displays the light of each color in a time-sharing manner according to the data, so that a color image 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. 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. 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 in a corner of the left panel 15 near the back panel.

  Next, the projector control means of the projector 10 will be described with reference to the functional block diagrams of FIGS. The projector control means includes a control unit 38, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. The control unit 38 controls the operation of each circuit in the projector 10, and is composed of a ROM in which operation programs such as a CPU and various settings are fixedly stored, a RAM used as a work memory, and the like. Yes.

  Then, the image signal of various standards input from the input / output connector unit 21 by the projector control means is in a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted so as to be unified into an image signal, it is output 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 driving unit 26 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 display driving unit 26 is emitted from the light source unit 60. The light beam, that is, the light beam guided to a predetermined surface by the light guide optical system of the light source unit 60 is condensed on the display element 51 through the light source side optical system, so that an optical image is reflected by the reflected light of the display element 51. Are projected and displayed on a screen (not shown) via a projection-side optical system described later. 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.

  Then, 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 received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is output to the control unit 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.

  A light source unit drive circuit 41 is connected to the control unit 38, and the control unit 38 and the light source unit drive circuit 41 emit light source light of a predetermined wavelength band required at the time of image generation from the light source unit 60. Thus, it functions as a light source control means for controlling the light source unit 60. Specifically, as shown in FIG. 3, the control unit 38 controls the light source driving circuit 41a to emit light from the first light source 71 of the blue light source device and the second light source 121 of the red light source device in the light source unit 60. Control individually. Further, the control unit 38 controls the rotation motor drive circuit 41b to drive the wheel motor 110 to rotate the fluorescent wheel 101 of the fluorescent light emitting device in the circumferential direction at a predetermined rotational speed.

  The wheel motor 110 is connected to a rotational position detecting means 56 that can detect the rotational position. The rotational position detection means 56 is an optical sensor that optically detects a mark provided on a part of the surface of the fluorescent wheel 101, or a magnetic sensor using a Hall element, and the rotation detected by the optical sensor or the magnetic sensor. The position data is sent to the control unit 38.

  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 individually controls the rotation speeds of the plurality of cooling fans from the result of the temperature detection. To do. Also, the control unit 38 and the cooling fan drive control circuit 43 keep the cooling fan rotating even after the projector body is turned off by a timer or the like, or 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. 4 is a schematic plan view showing the internal structure of the projector 10. As illustrated, 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 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 blue light source device 70. Fluorescent light emitting device 100 disposed in the vicinity of front panel 12, red light source device 120 disposed on the right side of fluorescent light emitting device 100, and light of each wavelength band light emitted from fluorescent wheel 101 in fluorescent light emitting device 100 And a light guide optical system 140 that converts the light beams in the respective color wavelength bands to the entrance of the light tunnel 175 that is a predetermined surface.

  The blue light source device 70 includes a light source group composed of a plurality of first light sources 71 arranged so that the optical axis thereof is parallel to the back panel 13, and the optical axis of the emitted light from each first light source 71 is 90 in the direction of the front panel 12. A plurality of reflection mirrors 75 that convert the degree of light, a condenser lens 78 that condenses the light emitted from each first light source 71 reflected by the plurality of reflection mirrors 75, and the first light source 71 and the right panel 14 are disposed. Heat sink 81, cooling fan 261, and the like.

  The light source group is formed by arranging first light sources 71, which are semiconductor light emitting elements that emit light in the blue wavelength band, in a matrix. Further, as the first light source 71, it is preferable to employ a high-power laser emitter capable of emitting a light beam with high directivity. Further, on the emission side of each first light source 71 on the optical axis of each first light source 71, a collimator which is a condensing lens that converts parallel light so as to enhance the directivity of the emitted light from each first light source 71 Lenses 73 are respectively arranged. The plurality of reflection mirrors 75 are arranged in a stepped manner, and by narrowing the interval between the light source light beams emitted from the first light sources 71, the cross-sectional area of the light beam emitted from the light source group is reduced in the horizontal direction. It is reduced and reflected toward the condenser lens 78.

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

  The red light source device 120 includes a light source group including a plurality of second light sources 121 arranged so as to be parallel to the optical axis of the first light source 71. The light source group includes a second light source 121, which is a semiconductor light emitting element that emits light in the red wavelength band, arranged in a matrix. As the second light source 121, it is preferable to employ a high-power laser emitter that can emit a light beam with high directivity, as with the first light source 71. Further, on the emission side of each second light source 121 on the optical axis of each second light source 121, a collimator that is a condensing lens that converts parallel light so as to enhance the directivity of the emitted light from each second light source 121 Lenses 123 are respectively arranged.

  The red light source device 120 includes a condenser lens 125 that condenses the light from the collimator lens 123. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right panel 14 side of the second light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the second light source 121 is cooled by the cooling fan 261.

  The fluorescent light emitting device 100 includes a disk-shaped fluorescent wheel 101 disposed on the optical path of the first light source 71 and the second light source 121, and a wheel motor 110 that is a drive device that rotates the fluorescent wheel 101 in the circumferential direction. . The fluorescent wheel 101 is parallel to the front panel 12, that is, orthogonal to the optical axis of the light emitted from the blue light source device 70, and orthogonal to the optical axis of the light emitted from the red light source device 120. Are arranged as follows. As a result, the light emitted from the first light source 71 and the second light source 121 is applied to one surface of the fluorescent wheel 101.

  As shown in FIGS. 5 (a) and 5 (b), this fluorescent wheel 101 is a metal base material made of disk-like copper, aluminum, or the like, and this base material has an arc-shaped notch 102. Is provided. The notch 102 has a through-opening from one surface of the substrate to the other surface, that is, from the surface on the side where the first light source 71 is disposed to the surface on the opposite side.

  The fluorescent wheel 101 has a fluorescent light emitting unit 103 in a concave portion provided on a surface on which the first light source 71 is disposed, and a diffused and transmissive unit 104 in a notch 102. The fluorescent light emitting unit 103 is a silicon having high heat resistance and high translucency in which a green phosphor that receives emission light from the first light source 71 of the blue light source device 70 as excitation light and emits fluorescent light in a green wavelength band. A layer is formed by being uniformly mixed with a binder such as a resin and has an arc shape. In addition, the surface of the base material on the first light source 71 side is mirrored by silver vapor deposition or the like so as to form a reflective surface that reflects light, and the surface of the concave portion that is mirrored, that is, the reflective surface A phosphor layer is formed thereon.

  The diffuse transmission unit 104 is an optical component that diffuses and transmits the incident light without converting the wavelength band of the incident light. The diffuse transmission part 104 is formed with fine irregularities by, for example, blasting one surface of a glass material. Further, the diffusing and transmitting portion 104 has an arc shape corresponding to the arc-shaped notch portion 102 of the fluorescent wheel 101 and is disposed so as to close the arc-shaped notch portion 102. That is, the fluorescent light emitting unit 103 and the diffuse transmission unit 104 are juxtaposed in the circumferential direction on the surface on which the first light source 71 is disposed.

  The light source unit 60 can be irradiated by a light guide optical system, which will be described later, on the fluorescent light emitting unit 103 and the diffuse transmission unit 104 in the fluorescent wheel 101 that rotates the laser light from the first light source 71 and the second light source 121. Has been. The second light source 121 only needs to be able to irradiate the laser beam of the red wavelength band only to the diffuse transmission part 104 of the rotating fluorescent wheel 101. Therefore, the light source control means diffuses and transmits the light from the second light source 121. The light emission of the second light source 121 is controlled so that the unit 104 is irradiated.

  The light source control means causes the first light source 71 and the second light source 121 to individually emit light, and causes the blue laser light from the first light source 71 to enter the fluorescent light emitting unit 103, thereby emitting green fluorescent light from the fluorescent light emitting unit 103. By making blue laser light from the first light source 71 enter the diffuse transmission part 104, the blue light diffused from the diffusion transmission part 104 can be emitted, and the red laser light from the second light source 121 is diffused. By making the light incident on the transmission part 104, the red light diffused from the diffusion transmission part 104 can be emitted.

  Further, as shown in FIG. 4, the fluorescent light emitting device 100 condenses the light bundle emitted from the blue light source device 70 onto the fluorescent wheel 101 and emits the light bundle emitted from the fluorescent wheel 101 toward the rear panel 13. And a condensing lens 115 that condenses the light bundle emitted from the fluorescent wheel 101 toward the front panel 12.

  Then, when the laser light emitted from each first light source 71 in the blue light source device 70 is irradiated as the excitation light to the fluorescent light emitting unit 103 of the fluorescent wheel 101, the green phosphor in the fluorescent light emitting unit 103 is excited. The green light emitted from the green phosphor in all directions is directly emitted to the rear panel 13 side or reflected by the surface of the fluorescent wheel 101 and then emitted to the rear panel 13 side and enters the condenser lens group 111. Further, when the laser light in the blue wavelength band emitted from each first light source 71 in the blue light source device 70 described above is irradiated to the diffusing and transmitting portion 104 of the fluorescent wheel 101, the incident blue laser light is diffused by the fine unevenness. And is incident on the condensing lens 115. Similarly, when the red wavelength band laser light emitted from each of the second light sources 121 in the red light source device 120 is applied to the diffusing and transmitting portion 104 of the fluorescent wheel 101, the incident red laser light is diffused by the fine unevenness. And is incident on the condenser lens 115.

  The light in the red, green, and blue wavelength bands emitted from the fluorescent wheel 101 is guided by the light guide optical system 140 of the light source unit 60 to the entrance of the light tunnel 175 that is a predetermined surface. Further, each color light guided to the light tunnel 175 is condensed on the display element 51 by the light source side optical system 170 in the optical system unit 160 and projected onto the screen by the projection side optical system 220. The layout of the light guide optical system 140 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 a light guide 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 the light source side optical system 170 that condenses the light source light emitted from the light source unit 60 onto the display element 51 included in the image generation block 165. As the light source side optical system 170 included in the illumination side block 161, a light tunnel 175 serving as a light guide device that converts the light beam emitted from the light source unit 60 into a light beam having a uniform intensity distribution, or the light tunnel 175 is emitted. There are a condensing lens 178 for condensing the reflected light, an optical axis changing mirror 181 for converting 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 source side optical system 170, the image generation block 165 includes a condenser lens 183 that condenses the light source light reflected by the optical axis changing mirror 181 on the display element 51, and a light beam that has passed through the condenser 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.

  By configuring the projector 10 in this way, when the fluorescent wheel 101 is rotated and light is emitted from the blue light source device 70 and the red light source device 120 at different timings, red, green, and blue wavelength band lights are guided by the light guide optical system. It is possible to individually enter the light tunnel 175 via 140. That is, in the light source unit 60 mounted on the projector 10, the light source control unit executes control to cause the first light source 71 and the second light source 121 to emit light separately, so that the light source unit 60 is red, Monochromatic light in the green and blue wavelength bands can be emitted.

  For example, while the fluorescent wheel 101 makes one rotation, the light source control unit performs control to turn on the first light source 71 of the blue light source device 70 and turn off the second light source 121 of the red light source device 120, thereby generating green light. Blue light can be generated. Further, during the rotation of the fluorescent wheel, the light source control means turns on the first light source 71 and causes the red light source device to irradiate the fluorescent light emitting unit 103 with the light from the first light source 71 of the blue light source device 70. The second light source 120 is turned off, and the light source control means turns on the second light source 121 and irradiates the light from the second light source 121 of the red light source device 120 to the diffuse transmission unit 104 and the first of the blue light source device 70 By executing control to turn off the light source 71, green light and red light can be generated. In this case, each color light can be emitted from the light source unit 60 in the order of green, blue, green, and red by rotating the fluorescent wheel 101 twice in one frame. In addition, by expanding the area of the diffuse transmission unit 104, the light from the first light source 71 of the blue light source device 70 and the light from the second light source 121 of the red light source device 120 are sequentially transmitted to the diffusion transmission unit 104. If incident, green, blue, and red light can be emitted in order from the light source unit 60 while the fluorescent wheel 101 is rotated once in one frame.

  Thus, the light source unit 60 according to the present embodiment is configured to emit red, green, and blue light, and each color light emitted from the light source unit 60 is displayed on the display element via the light source side optical system 170. Since the light is incident on 51, the DMD which is the display element 51 of the projector 10 displays the light of each color in a time-sharing manner according to the data, so that an enlarged color image can be generated on the screen through the lens group.

  Various layouts can be adopted as the light guide optical system 140. Hereinafter, the light guide optical system 140 will be described. The light guide optical system 140 includes a first optical axis conversion member 1, a second optical axis conversion member 2, a third optical axis conversion member 3, a fourth optical axis conversion member 4, and a plurality of lenses. .

  The first optical axis conversion member 1 is a cross dichroic disposed between the first light source 71 and the second light source 121 and the fluorescent wheel 101 on the optical path of the light emitted from the first light source 71 and the second light source 121. It is a prism. The first optical axis conversion member 1 converts the optical axis of the blue light emitted from the first light source 71 at a position where the optical axis of the first light source 71 and the optical axis of the second light source 121 intersect. A first reflecting surface (dichroic surface) 1a that reflects the red light so that the direction of the optical axis of the red light transmitted through the second light source 121 without being transmitted is changed 90 degrees toward the front panel 12 . Further, the first optical axis conversion member 1 converts the blue light and red light without changing the direction of each optical axis of the blue light emitted from the first light source 71 and the red light emitted from the second light source 121. A second reflecting surface that transmits green fluorescent light so that the direction of the optical axis of the green fluorescent light emitted from the phosphor in the fluorescent light emitting unit 103 of the fluorescent wheel 101 is changed by 90 degrees toward the left panel 15. (Dichroic surface) 1b.

  The second optical axis conversion member 2 is on the opposite side of the fluorescent light wheel 101 from the first light source 71 and the second light source 121 on the optical path of the light emitted from the first light source 71 and the second light source 121. It is arranged between a certain condensing lens 115 and the front panel 12. The second optical axis conversion member 2 is configured to change the directions of the optical axes of the blue light emitted from the first light source 71 and the red light emitted from the second light source 121 that pass through the diffusing and transmitting portion 104 of the fluorescent wheel 101 to the left panel. It is a normal reflection mirror that converts 90 degrees in 15 directions.

  The third optical axis conversion member 3 is disposed on the optical axis of the light emitted from the first light source 71 and the second light source 121 converted by the second optical axis conversion member 2, and this optical axis is directed to the rear panel 13 direction. A normal reflecting mirror that converts the angle to 90 degrees is used.

  The fourth optical axis conversion member 4 includes an optical axis of fluorescent light emitted from the fluorescent light emitting unit 103 converted by the first optical axis conversion member 1, and a first light source 71 converted by the third optical axis conversion member 3. And a dichroic mirror disposed at a position where the optical axis of the light emitted from the second light source 121 intersects. The fourth optical axis conversion member 4 does not change the directions of the optical axes of the blue and red lights emitted from the first light source 71 and the second light source 121 converted by the third optical axis conversion member 3. Further, the direction of the optical axis of the green fluorescent light converted by the first optical axis conversion member 1 is changed by 90 degrees in the direction of the back panel 13 so as to coincide with the optical axes of the blue and red lights.

  That is, the third optical axis conversion member 3 and the fourth optical axis conversion member 4 are the first light source converted by the optical axis of the fluorescent light converted by the first optical axis conversion member 1 or the second optical axis conversion member 2. By further converting the optical axis of the light emitted from 71 and the second light source 121, each color wavelength band light emitted from the fluorescent wheel 101 can be guided to the same optical path directed in the same direction.

  As described above, each color light guided to the light tunnel 175 is condensed on the display element 51 by the light source side optical system 170 in the optical system unit 160 and projected on the screen by the projection side optical system 220. It becomes. That is, in the light source unit 60, the light source control unit in the projector control unit executes control for causing the first light source 71 and the second light source 121 to emit light individually, so that red, green, and blue are emitted from the light source unit 60 in one frame. Monochromatic light in the wavelength band can be emitted. Then, the DMD that is the display element 51 of the projector 10 displays the light of each color in a time-sharing manner according to the data, so that a color image can be generated on the screen.

  As described above, the first light source 71 for exciting the phosphor, the phosphor wheel 101 having a phosphor with a good luminous efficiency, and a phosphor having a relatively low luminous efficiency, for example, a red phosphor. A second light source 121 that is a monochromatic light source that emits light in the red wavelength band corresponding to the phosphor with low light emission efficiency without being formed into a light source unit 60 that can improve screen brightness. And the projector 10 including the light source unit 60 can be provided.

  In addition, the light source unit 60 is a simple unit that generates light of each color by irradiating the diffusing and transmitting unit 104 of one fluorescent wheel 101 with the laser light from the first light source 71 and the laser light from the second light source 121. Therefore, the projector 10 including the light source unit 60 can be downsized.

  Furthermore, since the first light source 71 and the second light source 121 are laser emitters, the brightness of the screen can be easily improved, and the light source unit 60 can be made small. Note that the first light source 71 and the second light source 121 are not limited to laser light emitters, and the luminance can be improved by providing a large number of high-power light emitting diodes.

  Since the fluorescent plate is formed as a disc-shaped fluorescent wheel 101 and the fluorescent wheel 101 is configured to rotate, the light source unit 60 is a simple light source unit 60, which can expand the irradiation area and avoid heat concentration. A light source unit 60 can be provided.

  In addition, since the reflecting surface is formed on the fluorescent light emitting portion 103 in the fluorescent wheel 101, the blue light irradiated to the reflecting surface without being absorbed by the phosphor is reflected by the reflecting surface and is emitted again to the phosphor side. Since the phosphor can be excited, the utilization efficiency of the blue light from the first light source 71 can be improved and light can be emitted more brightly. Furthermore, since the green light emitted from the green phosphor to the substrate side can be reflected by the reflecting surface and emitted as the light source light, the utilization efficiency of the fluorescent light can be improved. In addition, by adopting a metal base material having high thermal conductivity as the base material of the fluorescent wheel 101, the fluorescent wheel 101 can be efficiently cooled.

  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. For example, the area ratios of the fluorescent light emitting unit 103 and the diffuse transmission unit 104 in the fluorescent wheel 101 can be freely changed. Thereby, the duty ratio of each color can be set arbitrarily. Further, the light source control means may be provided individually in the light source unit 60 without being provided in the projector 10.

  When the luminous efficiency of the red phosphor is higher than that of the green phosphor, the fluorescent light emitting unit 103 can form a red phosphor layer instead of the green phosphor layer. In this case, the second light source 121 provides a light source unit 60 capable of emitting each color light with high luminance as a laser light emitter that emits laser light in the green wavelength band, instead of a laser light emitter that emits laser light in the red wavelength band. can do. Note that the light source unit 60 having such a configuration can not only turn on the first light source 71 and the second light source 121 separately but also turn them on at the same time, so that the three primary colors of light are red, green, and blue wavelengths. In addition to the band light, cyan wavelength band light which is a complementary color can also be generated.

  The optical layout of the light source unit 60 is not limited to the illustrated one, and various modes can be adopted according to the arrangement configuration of each light source device in the housing of the projector 10. Hereinafter, other variations of the arrangement configuration of the second to fourth optical axis conversion members 2 to 4 will be described with reference to FIGS. 6 and 7.

  FIG. 6A shows an optical path B of blue light emitted from the first light source 71 and green emitted upon receiving light from the first light source 71 in the optical layout of the light source unit 60 (see FIG. 4). 4 is a schematic diagram showing an optical path G of fluorescent light and an optical path R of red light emitted from the second light source 121. FIG. That is, in the first optical layout shown in FIG. 6A, as shown in FIG. 7, the first reflecting surface 1a of the first optical axis conversion member 1 transmits green and blue light and reflects red light. It is considered as a dichroic surface. The second reflecting surface 1b of the first optical axis converting member 1 is a dichroic surface that transmits red and blue light and reflects green light.

  In the first optical layout, the second optical axis conversion member 2 and the third optical axis conversion member 3 are normal reflection mirrors that reflect red and blue light, and the fourth optical axis conversion member 4 is red and blue. It is a dichroic mirror that transmits blue light and reflects green light.

  The optical layout is a second optical layout in which the fourth optical axis conversion member 4 of the first optical layout is a dichroic mirror that reflects red and blue light and transmits green fluorescent light as shown in FIG. It is good also as FIG.6 (b).

  Further, the third optical axis converting member 3 is a dichroic mirror that transmits red and blue light and reflects green fluorescent light, and the fourth optical axis converting member 4 is a reflecting mirror as a third optical layout (FIG. 6 ( c)) can also be adopted.

  In addition, the third optical axis conversion member 3 in the third optical layout is a dichroic mirror that reflects red and blue light and transmits green fluorescent light, so that a fourth optical layout (FIG. 6) that is another optical layout. (See (d)) can also be configured.

  Further, in the light guide optical system 140 of the light source unit 60, the third optical axis conversion member 3 and the fourth optical axis conversion member 4 are emitted from the fluorescent light emitting unit 103 of the fluorescent wheel 101, and the first optical axis conversion member 1 is a normal reflecting mirror that reflects green fluorescent light reflected by the second reflecting surface 1b, and the second optical axis conversion member 2 transmits red and blue light that has passed through the diffusing and transmitting portion 104 of the fluorescent wheel 71. It is also possible to adopt a fifth optical layout (see FIG. 6E) which is a dichroic mirror that further reflects the green fluorescent light reflected by the third optical axis conversion member 3.

  The second optical axis converting member 2 in the fifth optical layout is a dichroic mirror that transmits green fluorescent light and reflects red and blue light. )) Can also be configured.

  In this way, the dichroic surface that transmits the light emitted from the first light source 71 and the second light source 121 and reflects the fluorescent light emitted from the phosphor of the fluorescent wheel 101 is a cross that is the first optical axis conversion member 1. Green fluorescent light emitted from the fluorescent wheel 101 by the light guide optical system 140 formed by the second reflecting surface 1b of the dichroic prism and further combining the characteristics of the second to fourth optical axis conversion members 2 to 4 in various combinations. Or by constituting a plurality of mirrors arranged on the optical path of blue and red light emitted from the first light source 71 and the second light source 121 diffusely transmitted through the fluorescent wheel 101 and a plurality of lenses for condensing light, Since each color wavelength band light can be converted so as to coincide with each other, and each color light can be condensed to the light tunnel 175, a light source unit 60 having a high degree of freedom in arrangement capable of selecting various optical layouts, this It is possible to provide a device such as a projector 10 incorporating the source unit 60.

  The first optical axis conversion member 1 is not limited to a cross dichroic prism, but may be a dichroic mirror. In this case, two dichroic mirrors are arranged in place of the cross dichroic prism.

  For example, as shown in FIG. 8, the blue color is positioned at a position where the optical axis of the light emitted from the first light source 71 via the reflecting mirror 75 and the optical axis of the light emitted from the second light source 121 intersect. An optical system in which a dichroic mirror 5 that transmits light and reflects red light is disposed, and a dichroic mirror 6 that transmits red and blue light and reflects green light is disposed between the dichroic mirror 5 and the fluorescent wheel 101. A layout can also be adopted.

  Thereby, the blue light emitted from the first light source 71 reflected by the reflection mirror 75 passes through the two dichroic mirrors 5 and 6 and is irradiated to the fluorescent light emitting unit 103 or the diffuse transmission unit 104 of the fluorescent wheel 101. It will be.

  The red light emitted from the second light source 121 is reflected by the dichroic mirror 5 to the fluorescent wheel 101 side, passes through the dichroic mirror 6 disposed in the vicinity of the fluorescent wheel 101, and enters the diffusing and transmitting portion 104 of the fluorescent wheel 101. Will be irradiated.

  Further, the green fluorescent light emitted from the fluorescent light emitting unit 103 of the fluorescent wheel 101 is reflected to the fourth optical axis conversion member 4 side by the dichroic mirror 6 disposed in the vicinity of the fluorescent wheel 101.

  That is, a dichroic mirror 5 having a dichroic surface having the same characteristics as the first reflecting surface 1a in the cross dichroic prism described above, and a dichroic surface having the same characteristics as the second reflecting surface 1b in the cross dichroic prism are formed. Since the dichroic mirror 6 can irradiate the light from the first light source 71 and the light from the second light source 121 to the fluorescent wheel 101, the screen brightness can be improved similarly to the above. A light source unit 60 can be provided.

  When two dichroic mirrors 5 and 6 are arranged at different locations instead of the cross dichroic prism, between the dichroic mirror 6 (second reflecting surface 1b) that reflects green fluorescent light and the first light source 71. Without arranging the dichroic mirror 5 (first reflection surface 1a) that reflects red light, the dichroic mirror 6 (second reflection surface 1a) that reflects red light reflects the dichroic mirror 6 (second reflection surface) that reflects green fluorescent light. It may be arranged between the reflecting surface 1b) and the fluorescent wheel 101.

  Further, the positions of the first light source 71 of the blue light source device 70 and the second light source 121 of the red light source device 120 are not limited to the above-described configuration (FIG. 6), and an optical layout that is interchanged is adopted. You can also In this case, the first reflecting surface 1a is formed by a dichroic mirror or a cross dichroic prism as a dichroic surface that reflects the blue light emitted from the first light source 71 and transmits the red light emitted from the second light source 121. Is done.

  For example, as shown in FIG. 9, the second light source 121 of the red light source device 120 is disposed between the blue light source device 70 and the back panel 13, and the optical axis of the blue light source device 71 and the optical axis of the red light source device 120 are The dichroic mirror 76 having a dichroic surface 1a that reflects the blue light emitted from the first light source 71 and transmits the red light emitted from the second light source 121 at the position where the first light sources 71 cross each other. Can be arranged. Of course, as shown in FIG. 10, the light reflected by reducing the cross-sectional area of the light beam emitted from the light source group by the reflecting mirror 75 in the horizontal direction is reflected on the dichroic surface that reflects blue light and transmits red light ( A configuration can also be adopted in which the dichroic mirror 5 having the first reflecting surface 1a) is reflected toward the fluorescent wheel 101.

  In addition, as described above (see FIGS. 6A to 6F), the second to fourth optical axis conversion members 2 to 4 emit light emitted from the first light source 71 and the second light source 121 or Any of two reflection mirrors for converting the optical axis of the fluorescent light, the optical axis of the light emitted from the first light source 71 and the second light source 121, and the optical axis of the fluorescent light emitted from the fluorescent light emitting unit 103 Without being limited to the case of comprising one dichroic mirror that converts the other without converting one, the second to fourth optical axis conversion members 2 to 4, as shown in FIG. Adopting an optical layout made up of three reflecting mirrors that transform the optical axis of the light emitted from the first light source 71 and the second light source 121 by 90 degrees, mainly from the first light source 71 and the second light source 121 By reflecting blue and red light repeatedly, red and green fluorescent light and blue light are directed in the same direction. It can also be guided to the same optical path that had.

  As described above, the light guide optical system 140 is disposed between the first light source 71 and the second light source 121 and the fluorescent wheel 101, and the optical axis of the light emitted from the first light source 71 and the second light source 121. A first optical axis converting member 1 having a dichroic surface (second reflecting surface 1b) for converting the direction of the optical axis of fluorescent light emitted from the fluorescent light emitting unit 103 without changing the direction, and a fluorescent wheel 101 A dichroic mirror or a normal reflection mirror that changes the direction of the optical axis of light emitted from the first light source 71 and the second light source 121 that passes through the diffuse transmission part 104 of the first light source 71 and the second light source 121. A second optical axis conversion member 2 that is a dichroic mirror that converts the optical axis of the fluorescent light emitted from the fluorescent light emitting portion 103 of the fluorescent wheel 101 without changing the direction of the optical axis of the emitted light, and the first optical axis Optical axis and second optical axis of fluorescent light converted by the conversion member 1 By further converting the optical axes of the light emitted from the first light source 71 and the second light source 121 converted by the conversion member 2, the light of each color wavelength band emitted from the fluorescent wheel 101 is directed to the same direction. The third optical axis conversion member 3 and the fourth optical axis conversion member 4 that lead to the road can be used in various layouts, but both have a simple configuration that can improve the screen brightness. By providing the unit 60 and the light source unit 60, it is possible to provide the projector 10 that is reduced in size.

  Since the first light source 71 is a blue laser emitter, the light from the first light source 71 can be diffused and transmitted and used as bright light source light as it is. However, the first light source 71 is not limited to a laser emitter that emits light in the blue wavelength band, and is not limited to light in other wavelength bands that can excite the phosphor of the fluorescent light emitting unit 103, for example, in the ultraviolet region. A laser emitter that emits light (ultraviolet rays) can also be used. In this case, the fluorescent wheel 101 is formed with a fluorescent light emitting portion 103 made of a blue fluorescent material layer or a green fluorescent material layer, and a diffuse transmission portion 104. Then, the light source control means is controlled so that light is not irradiated to the diffusing and transmitting unit 104 from the ultraviolet laser emitter. In addition, the light guide optical system 140 has a characteristic that in the light guide optical system 140 described above, the mirror that reflects the green fluorescent light reflects not only the green fluorescent light but also the blue fluorescent light and transmits the green fluorescent light. The mirror having the light transmits not only green fluorescent light but also blue fluorescent light.

  The light source unit 60 is not limited to the case where the light emitting unit 100 includes the fluorescent light emitting device 100 configured to rotate the fluorescent plate (fluorescent wheel 101) as a circular plate as described above, and the fluorescent light emission in which the rectangular fluorescent plate is fixed. The apparatus 100 may be provided. When fixing the fluorescent plate in this way, an adjusting device that changes the irradiation direction of the light emitted from each of the first light source 71 and the second light source 121 between the first light source 71 and the second light source 121 and the fluorescent plate is provided. Irradiation of light from the first light source 71 and the second light source 121 by providing a light source driving device that is disposed or driven to change the position and / or irradiation direction of the first light source 71 and the second light source 121 By moving the spot position, fluorescent light and diffused light can be emitted from the fluorescent plate. In addition, as an adjustment apparatus, the optical polarizer using a KTN crystal | crystallization, an acoustooptic element, a MEMS mirror etc. is employable, for example.

1 First optical axis conversion member 1a First reflective surface
1b Second reflecting surface 2 Second optical axis conversion member
3 Third optical axis conversion member 4 Fourth optical axis conversion member
5 Dichroic mirror 6 Dichroic mirror
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 unit drive circuit
41a Light source drive circuit 41b Rotary motor drive circuit
43 Cooling fan drive control circuit 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 56 Rotation position detection means
60 Light source unit
70 Blue light source device 71 First light source
73 Collimator lens 75 Reflective mirror
76 Dichroic mirror 78 Condensing lens
81 Heat sink 100 Fluorescent light emitting device
101 Fluorescent wheel 102 Notch
103 Fluorescent light emitting part 104 Diffuse transmission part
110 wheel motor
111 Condensing lens group
115 condenser lens
120 Red light source device 121 Second light source
123 Collimator lens
125 Condenser lens 130 Heat sink
140 Light guiding optical system 160 Optical system unit
161 Lighting block 165 Image generation block
168 Projection side block 170 Light source side optical system
175 Light Tunnel
178 Condensing lens 181 Optical axis change 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

Claims (12)

A fluorescent plate having a fluorescent light emitting part on which a phosphor layer is formed, and a diffusion transmission part that diffuses and transmits light;
A first light source that emits light in a wavelength band capable of exciting the phosphor;
A second light source that emits light of a wavelength band different from the fluorescent light emitted from the phosphor and the light emitted from the first light source;
A light guide optical system for guiding each color wavelength band light emitted from the fluorescent plate to a predetermined surface;
Light source control means for individually controlling the light emission of the first light source and the second light source,
In the fluorescent light emitting portion of the fluorescent plate, a reflective surface for reflecting light is formed, and a phosphor layer is formed on the reflective surface,
The fluorescent plate is disposed on an optical path of the first light source and the second light source,
Transmits light emitted from the first light source and reflects light emitted from the second light source at a position where the optical axis of the first light source and the optical axis of the second light source intersect, or A dichroic surface that reflects light emitted from the first light source and transmits light emitted from the second light source is disposed,
The light source unit, wherein the light emitted from the first light source and the second light source can be applied to the fluorescent light emitting portion and the diffuse transmission portion of the fluorescent plate. The light guide optical system collects a plurality of mirrors and light arranged on an optical path of fluorescent light emitted from the fluorescent plate and light emitted from the first light source and the second light source diffused and transmitted through the fluorescent plate. Composed of multiple lenses
A dichroic surface that transmits light emitted from the first light source and the second light source and reflects fluorescent light emitted from the phosphor of the fluorescent plate is disposed between the first light source, the second light source, and the fluorescent plate. The light source unit according to claim 1, wherein the light source unit is arranged. The light guide optical system is disposed between the first light source and the second light source and the fluorescent plate, and without changing the direction of the optical axis of the light emitted from the light source, and the fluorescent light emitting unit A first optical axis conversion member having a dichroic surface for converting the direction of the optical axis of the fluorescent light emitted from
A dichroic mirror or a normal reflecting mirror that changes the direction of the optical axis of the light emitted from the first light source and the second light source that passes through the diffuse transmission part of the fluorescent plate, or emitted from the first light source and the second light source. A second optical axis conversion member that is a dichroic mirror that converts the optical axis of the fluorescent light emitted from the fluorescent light emitting part of the fluorescent plate without changing the direction of the optical axis of the light
By further converting the optical axis of the fluorescent light converted by the first optical axis conversion member and the optical axis of the light emitted from the first light source and the second light source converted by the second optical axis conversion member, The third optical axis converting member and the fourth optical axis converting member for guiding each color wavelength band light emitted from the fluorescent plate to the same optical path directed in the same direction, Light source unit. The first optical axis conversion member is disposed between the fluorescent plate and the light source on an optical path of light emitted from the first light source and the second light source,
The second optical axis conversion member is disposed at a position opposite to the light source with respect to the fluorescent plate on an optical path of light emitted from the first light source and the second light source,
The third optical axis conversion member is disposed on the optical axis of the light emitted from the first light source and the second light source converted by the second optical axis conversion member,
The fourth optical axis conversion member includes an optical axis of fluorescent light emitted from the fluorescent light emitting unit converted by the first optical axis conversion member, the first light source converted by a third optical axis conversion member, and The light source unit according to claim 3, wherein the light source unit is disposed at a position where the optical axis of light emitted from the second light source intersects.   The light source unit according to claim 3, wherein the first optical axis conversion member is a dichroic prism.   The light source unit according to claim 3, wherein the first optical axis conversion member is a dichroic mirror.   The second to fourth optical axis conversion members include two reflection mirrors that convert the optical axes of light or fluorescent light emitted from the first light source and the second light source, and the first light source and the second light source. The optical axis of the emitted light, and one dichroic mirror that converts the other without converting any one of the optical axes of the fluorescent light emitted from the fluorescent light emitting unit. The light source unit according to claim 3, wherein the light source unit is a light source unit. The second optical axis conversion member is a reflection mirror that converts the optical axis of the light emitted from the first light source and the second light source that is transmitted through the diffuse transmission part of the fluorescent plate by 90 degrees,
The third optical axis conversion member is a reflection mirror that converts the optical axis of the light emitted from the first light source and the second light source converted by the second optical axis conversion member by 90 degrees,
The fourth optical axis conversion member does not change the direction of the optical axis of the light emitted from the first light source and the second light source converted by the third optical axis conversion member, and the first light The light source unit according to claim 7, wherein the light source unit is a dichroic mirror that converts the direction of the optical axis of the fluorescent light converted by the axis conversion member by 90 degrees.   The light source according to any one of claims 3 to 6, wherein the second to fourth optical axis conversion members are three reflection mirrors that convert the optical axis of light by 90 degrees. unit.   The fluorescent plate is a fluorescent wheel made of a disk-like base material that is rotationally driven by a wheel motor, wherein the fluorescent light emitting part and the diffuse transmission part are arranged side by side in the circumferential direction. The light source unit according to any one of claims 1 to 9. The first light source is a laser emitter that emits light in a blue wavelength band,
The second light source is a laser emitter that emits light in a red wavelength band,
11. The light source unit according to claim 1, wherein the phosphor is a phosphor that receives excitation light from the first light source and emits fluorescent light in a green wavelength band. . 12. The light source unit according to claim 11, a display element, a light source side optical system that focuses light from the light source unit on the display element, and a projection side optical that projects an image emitted from the display element onto a screen. A projector comprising: a system; and projector control means for controlling the light source unit and the display element.

Images