JP2009150938A - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device using a light emitting diode and a solid-state light emitting element, and a projector capable of projecting a high-luminance projection image by using the light source device. <P>SOLUTION: The projector is equipped with the light source device, a light guide device, a display element, a projection side optical system and a projector control means. The light source device includes a blue light emitting diode 161B functioning as a first light source 153 converting electric energy into exciting light, and a fluorescent material 169 formed like a plate and functioning as a second light source 154 receiving emitted light from the first light source 153 and emitting light having different spectral distribution from that of emitted light from the first light source 153, wherein area of the emitting region of the first light source 153 is formed to be wider than the area of the emitting region of the second light source 154. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

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

  In the past, projectors using a high-intensity discharge lamp as the light source have been the mainstream, but in recent years, development has been made to use solid-state light emitting elements such as red, green, and blue light emitting diodes and organic EL as the light source. Many proposals have been made.

  A light emitting diode consumes less power and has higher reliability than a discharge lamp, but has a problem in that it cannot produce a desired luminance when used alone in a projector because it emits less light. Therefore, in order to use the light emitting diode as a light source of the projector, a plurality of light emitting diodes may be arranged and emitted light from the plurality of light emitting diodes may be combined and used.

For example, in Japanese Patent Application Laid-Open No. 2005-274836 (Cited Document 1), a plurality of white diodes are arranged in parallel on a base member having a substantially spheroidal or paraboloidal shape, and the focal point is positioned in the vicinity of the incident surface of the light guide device. Proposals have been made for light source devices arranged as described above.
JP 2005-274836 A

  In an optical system such as an image display device, a spatial spread in which a light beam that can be effectively handled exists can be expressed as a product of an area and a solid angle, and this product is referred to as an etendue. This etendue is a value stored in the optical system.

  In a projector using a display element such as the DMD as described above, when the area of the illuminated area of the display element is S ′ and the solid angle of incident light that can be captured by the area S ′ of the illuminated area is Ω ′, The etendue of the display element is represented by S ′ × Ω ′. Further, when the area of the light emitting region of the light source device is S and the solid angle of the emitted light is Ω, the etendue of the light source device is expressed by S × Ω.

  Since etendue is a value stored in the optical system, when the value of etendue S × Ω of the light source device is smaller than the value of etendue S ′ × Ω ′ of the display element, all the light emitted from the light source device is used. It is possible to make all the emitted light effective. However, when the value of etendue S × Ω of the light source device is larger than the value of etendue S ′ × Ω ′ of the display element, the light is emitted from the light source device. Unusable light will be generated in the light.

  In a projector using a conventional light emitting diode, since the light emitting amount of the light emitting diode is small, it is necessary to arrange a plurality of light emitting diodes and collect and use light bundles emitted from the plurality of light emitting diodes. When the light emitting diodes are used, the etendue value of the light source device becomes larger than the etendue value of the display element, and there is a problem in that the use efficiency of the light emitting diodes decreases because the light that cannot be used increases.

  Further, among the light emitting diodes, the green light emitting diodes have lower luminous efficiency than the red light emitting diodes and the blue light emitting diodes, and therefore it is necessary to arrange a larger number than the red light emitting diodes and the blue light emitting diodes. In this case, even if the light emitting diodes are gathered densely, the area of the light emitting region increases as the number increases, and the ratio of the effective light decreases because the etendue value of the green light emitting diode light source increases. There was a problem that the shortage could not be resolved.

  The present invention has been made in view of the above-described problems of the prior art, and can project a projection image with high brightness by using a light source device using a light emitting diode or a solid light emitting element and the light source device. It is an object to provide a simple projector.

  A light source device according to the present invention includes a first light source that converts electrical energy into light, and a second light source that receives light emitted from the first light source and emits light having a spectral distribution different from that emitted from the first light source. The area of the light emitting region of the first light source is formed wider than the area of the light emitting region of the second light source.

  In addition, the first light source is formed of a solid light emitting element.

  The first light source may be formed of a light emitting diode.

  The second light source is made of a fluorescent material.

  The first light source is disposed on the back side of the second light source.

  The first light source may be disposed on the front side of the second light source.

  The first light source may be arranged on the front side and the back side of the second light source.

  In addition, an optical space for guiding light emitted from the first light source to the second light source is provided, and the first light source is disposed inside the optical space, and the optical space is on the back side of the second light source. Are arranged.

  Furthermore, a dichroic filter that transmits the light emitted from the first light source and reflects the light emitted from the second light source is disposed on the inner surface of the wall surface forming the optical space and at the second light source position. It is characterized by being.

  And the wall surface which forms the said optical space may be provided with the reflective surface in the inner surface except the part in which the said dichroic filter is arrange | positioned.

  Further, a dichroic filter that reflects the light emitted from the first light source and transmits the light emitted from the second light source together with the first light source may be disposed on the front side of the second light source.

  Furthermore, a condensing lens group having an optical axis combined with the optical axis of the second light source is provided in front of the second light source.

  In addition, the first light source is provided around the condensing lens group aligned with the optical axis of the second light source, and the light emitted from the first light source is reflected on any lens surface of the condensing lens group. A dichroic filter that transmits the light emitted from the second light source may be formed.

  Further, the first light source having an optical axis of 90 degrees and the optical axis of the second light source is emitted to the front side of the second light source, and light having the same color as the second light source and a slightly different wavelength is emitted. An auxiliary second light source having an optical axis of the second light source and an optical axis of 90 degrees, and near the position where the optical axis of the first light source and the second light source intersects at an angle of 45 degrees with both optical axes. A dichroic filter that reflects the emitted light from the first light source arranged to intersect and transmits the emitted light from the second light source is disposed, and in the vicinity of the position where the optical axes of the auxiliary second light source and the second light source intersect In some cases, a dichroic filter that reflects the light emitted from the auxiliary second light source disposed so as to intersect with both optical axes at an angle of 45 degrees and transmits the light emitted from the second light source may be disposed.

  The light source device includes a blue light generating device in which the second light source is formed of a blue fluorescent material, a green light generating device in which the second light source is formed of a green fluorescent material, and the second light source is red fluorescent. By providing a red light generating device formed of a substance, it is possible to emit light of three primary colors of blue, green, and red.

  The light source device includes a green light generation device having the first light source by a blue light emitting diode and the second light source by a green fluorescent material, a blue light generation device having a light source as a blue light emitting diode, and a red light emission by the light source. By providing a red light generating device as a diode, light emission of the three primary colors of blue, green and red may be possible.

  The projector according to the present invention includes a light source device, a light guide device, a display element, a projection side optical system, and a projector control means, and the light source device is a light source device having the above-described features. is there.

  According to the present invention, although a solid light emitting element or a light emitting diode is used as a light source, the light emission amount per unit area is large and the use efficiency of light emitted from the light emitting diode is high. A projector capable of projecting a high projection image can be provided.

  The projector 10 according to the best mode for carrying out the present invention includes a light source device 63, a light guide device 75, a display element 51, a projection-side optical system 90, and a projector control means.

  The light source device 63 includes a red light generation device 151R that emits red light, a green light generation device 151G that emits green light, and a blue light generation device 151B that emits blue light, and includes a red light generation device 151R. And the green light generating device 151G are arranged so that their optical axes are parallel, and the blue light generating device 151B is arranged in the vicinity of the green light generating device 151G so that the optical axis intersects the green light generating device 151G perpendicularly. Is.

  A red light reflecting mirror 142 for changing the optical axis direction of the red light emitted from the red light generating device 151R by the red light emitting diode 161R and the condenser lens group 164 is disposed on the optical axis of the red light generating device 151R. A first convex lens 143 that condenses the light beam of red light is disposed on the optical axis of red light reflected by the red light reflecting mirror 142, transmits green light emitted from the green light generating device 151G, and transmits blue light. A first dichroic mirror 144 as a first dichroic device that reflects the blue light emitted from the blue light generation device 151B by 161B and the condenser lens group 164 so as to be in the same optical axis direction as the optical axis direction of the green light is A second convex lens 145 is disposed near the position where the optical axes of the green light generation device 151G and the blue light generation device 151B intersect, and condenses the light bundles of green light and blue light, and transmits and reflects the first dichroic mirror 144. Light rays It is disposed on the optical axis.

  A second dichroic mirror 146 as a second dichroic device that transmits red light and reflects green light and blue light so as to be in the same optical axis direction as the optical axis direction of red light has a first convex lens 143 and a first convex lens 143. A third convex lens 147 is arranged near the position where the optical axes of the biconvex lens 145 intersect, and is arranged on the optical axis of the light bundle transmitted and reflected by the second dichroic mirror 146. It has been done.

  Further, the green light generating device 151G receives a light emitted from the first light source 153 and a light having a spectral distribution different from that emitted from the first light source 153 when the first light source 153 converts electrical energy into excitation light. The first light source 153 is formed so that the area of the light emitting region of the first light source 153 is wider than the area of the light emitting region of the second light source 154, and the first light source 153 is a blue light emitting diode 161B. The second light source 154 is formed of a fluorescent material 169 that emits green light, and the first light source 153 is disposed on the back side of the second light source 154.

  The green light generating device 151G includes a condensing lens group 164 on the optical axis of the second light source 154, and the condensing lens group 164 is disposed in front of the cylindrical base 171A and the base 171A. A first lens 171 having a protruding convex surface portion 171B and disposed in the vicinity of the second light source 154; a second lens 172 disposed in front of the first lens 171; and disposed in front of the second lens 172. And a third lens 173.

  The green light generating device 151G forms a first light source mounting substrate 165 to which the first light source 153 is mounted, and an optical space 159 that is a space for guiding the emitted light from the first light source 153 to the second light source 154. An optical space forming member 166, an optical space 159 is formed on the back side of the second light source 154, a first light source 153 is disposed in the optical space 159, and in the vicinity of the front side of the second light source 154 The condensing lens group 164 is disposed on the surface.

  The optical space forming member 166 has a box shape having a front wall and a side wall with an opening at the bottom. The optical space forming member 166 transmits light emitted from the first light source 153 to the center of the inner surface of the front wall and is a second light source. A dichroic filter 168 that reflects the light emitted from 154 is vapor-deposited, and a reflection mirror 167 is vapor-deposited on the inner surfaces of the front wall and the side wall except where the dichroic filter 168 is vapor-deposited.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the projector 10 according to the embodiment of the present invention has a substantially rectangular parallelepiped shape, and includes a lens cover 19 that covers a projection port on a side of a front panel 12 that is a side plate in front of the main body case. At the same time, the front panel 12 is provided with a plurality of exhaust holes 17. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  The top panel 11 as a main body case is provided with a key / indicator section 37. The key / indicator section 37 includes a power switch key, a power indicator for notifying power on / off, projection on, A projection switch key for switching off, a key and an indicator such as an overheat indicator for notifying when a light source device, a display element or a control circuit is overheated are provided.

  Further, on the back surface of the main body case, there are provided various terminals 20 such as an input / output connector portion and a power adapter plug for providing a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal and the like on the rear panel. Is.

  A plurality of air intake holes 18 are provided in the vicinity of the lower portion of the right side panel 14 which is a side plate of the main body case (not shown) and the left side panel 15 which is the side plate shown in FIG.

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

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

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51 which is a spatial light modulation element (SOM) at an appropriate frame rate in accordance with the transmitted image signal. A projection system lens that forms a light image with the reflected light of the display element 51 and makes the light beam emitted from the light source device 63 incident on the display element 51 via the light source side optical system, and serves as a projection side optical system An image is projected and displayed through a group on a screen (not shown). The movable lens group 97 of the projection side optical system is driven by a lens motor 45 for zoom adjustment and focus adjustment.

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

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

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

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

  The control unit 38 controls the light source control circuit 41, and controls the red light source, the green light source, and the blue light source in a time-sharing manner according to the image signal. Further, the cooling fan drive control circuit 43 performs temperature detection by a plurality of temperature sensors provided in the light source device 63, etc., and controls the rotation speed of the cooling fan. In addition, the rotation of the cooling fan is continued, and control such as turning off the power of the projector main body is performed depending on the result of temperature detection by the temperature sensor.

  These ROM, RAM, IC and circuit elements are incorporated in the control circuit board 103 and the power supply circuit block 101 as the main control board shown in FIG. The light source control circuit board 102 to which the system power supply circuit block 101 and the like are attached is formed separately.

  As shown in FIG. 3, the projector 10 has an internal structure in which a light source control circuit board 102 to which a power supply circuit block 101 and the like are attached is disposed in the vicinity of the right panel 14, and the interior of the housing is separated by a partition wall 120. The air intake side space chamber 121 on the side and the exhaust side space chamber 122 on the front panel 12 side are airtightly partitioned. Then, a sirocco fan type blower 110 as a cooling fan is arranged so that the suction port 111 is located in the intake side space chamber 121 and the discharge port 113 is located at the boundary between the exhaust side space chamber 122 and the intake side space chamber 121. It is what.

  Further, in the exhaust side space chamber 122, a light source device 63, a light guide device 75 provided in the illumination side block 78 of the optical system unit 70 for guiding the light emitted from the light source device 63 to the display element 51, and an exhaust temperature A reduction device 114 is arranged.

  As shown in FIG. 4, the light source device 63 includes a red light generation device 151R that is a specific wavelength region light generation device that emits red light, and a green light generation device that is a specific wavelength region light generation device that emits green light. 151G and a blue light generation device 151B, which is a specific wavelength range light generation device that emits blue light, and the red light generation device 151R has an optical axis in the vicinity of the front panel 12 shown in FIG. The green light generating device 151G is disposed so as to be substantially parallel to the red light generating device 151R so that the optical axis is parallel to the red light generating device 151R on the back panel 13 side, and the blue light generating device 151B. Is arranged in the vicinity of the green light generating device 151G so that the optical axis of the green light generating device 151G and the optical axis of the blue light generating device 151B intersect perpendicularly.

  The light source device 63 includes a red light reflecting mirror 142 that changes the optical axis direction of the red light emitted from the red light generating device 151R, a first convex lens 143 that collects the light beam of red light, and a green light generating device. The first dichroic as a first dichroic device that reflects green light emitted from the device 151G and reflects the blue light emitted from the blue light generating device 151B in the same optical axis direction as that of the green light. The mirror 144, the second convex lens 145 that collects the light bundle of green light and blue light, and the red light is transmitted and the green light and the blue light are reflected so as to have the same optical axis direction as the optical axis direction of the red light. A second dichroic mirror 146 as a second dichroic device, and a third convex lens 147 that condenses the light bundles of red light, green light, and blue light.

  The red light reflecting mirror 142 is disposed on the optical axis of the red light generating device 151R, and the first convex lens 143 is disposed on the optical axis of the red light reflected by the red light reflecting mirror 142, and the first dichroic The mirror 144 is disposed in the vicinity of the position where the optical axes of the green light generation device 151G and the blue light generation device 151B intersect, and the second convex lens 145 is on the optical axis of the light beam transmitted and reflected by the first dichroic mirror 144. The second dichroic mirror 146 is disposed in the vicinity of the position where the optical axis of the light bundle transmitted through the first convex lens 143 and the light bundle transmitted through the second convex lens 145 intersect, and the third convex lens 147 It is arranged on the optical axis of the light beam transmitted and reflected by the two-dichroic mirror 146.

  The red light generation device 151R is arranged in the vicinity of the front of the red light emitting diode 161R, a red light emitting diode 161R as a light source that is time-division controlled by the projector control means, a light source holder 162 that holds the red light emitting diode 161R A transparent cover member 163 and a condensing lens group 164 that condenses light emitted from the red light emitting diode 161R are provided.

  The light source holder 162 is formed of a back surface and an edge rising from the outer peripheral edge of the back surface, and a red light emitting diode 161R is disposed in the vicinity of the center of the back surface. The cover member 163 is a square plate made of transparent glass or resin, and is disposed near the front end of the edge of the light source holder 162 and seals the front of the red light emitting diode 161R. It is.

  Then, the light emitted from the red light emitting diode 161R passes through the cover member 163, is collected by the condenser lens group 164, is applied to the red light reflecting mirror 142, is reflected by the red light reflecting mirror 142, and then the first convex lens. The light is condensed at 143, transmitted through the second dichroic mirror 146, and condensed by the third convex lens 147 on the incident surface of the light guide device 75 described later.

  The blue light generating device 151B has the same configuration as the red light generating device 151R described above, and uses the blue light emitting diode 161B as a light source instead of the red light emitting diode 161R, and the light emitted from the blue light emitting diode 161B. Is transmitted through the cover member 163, collected by the condenser lens group 164, irradiated to the first dichroic mirror 144, reflected by the first dichroic mirror 144, and then collected by the second convex lens 145 to be collected by the second dichroic mirror. 146, reflected by the second dichroic mirror 146, and then collected by the third convex lens 147 on the incident surface of the light guide device 75 described later.

  The green light generation device 151G, which is a specific wavelength range light generation device that generates green light according to the present embodiment, includes a first light source 153 that converts electrical energy into excitation light, as shown in FIGS. A second light source 154 formed in a flat plate shape that receives light emitted from the first light source 153 and emits light having a spectral distribution different from that emitted from the first light source 153. The area of the light emitting region is formed wider than the area of the light emitting region of the second light source 154, and the first light source 153 is disposed on the back side of the second light source 154.

  The green light generating device 151G forms a first light source mounting substrate 165 to which the first light source 153 is mounted and an optical space 159 that is a space for guiding the emitted light from the first light source 153 to the second light source 154. An optical space forming member 166, an optical space 159 is formed on the back side of the second light source 154, a first light source 153 is disposed in the optical space 159, and in the vicinity of the front side of the second light source 154 The condensing lens group 164 is disposed on the surface.

  The first light source 153 is formed by a surface-mounted blue light emitting diode 161B, has a light emitting area larger than the light emitting area of the second light source 154, and is attached to the center of the first light source mounting substrate 165. It is arranged inside the optical space 159, has a central emission wavelength of about 460 nm (nanometers), and emits blue visible light or ultraviolet light.

  The optical space forming member 166 has a box shape with a front wall and a side wall made of transparent glass or resin, the inside is an optical space 159, and the second light source 154 is disposed at a substantially central portion of the outer surface of the front wall. A dichroic filter 168 that transmits the light emitted from the first light source 153 and reflects the light emitted from the second light source 154 is deposited on the inner surface of the position where the second light source 154 is disposed, and the dichroic filter 168 is deposited. A reflection mirror 167 is vapor-deposited on the inner surface except for the position.

  The second light source 154 is formed of a flat fluorescent material 169 that emits green light, an optical space 159 is disposed on the back side, and a condenser lens group 164 is disposed on the front side. The fluorescent material 169 absorbs light energy having a central emission wavelength of about 460 nm emitted from the blue light emitting diode 161B, thereby exciting the electrons in the fluorescent material 169 to emit green light. The light emitted from the blue light emitting diode 161B that has passed through the filter 168 is absorbed to emit green light.

  Note that when the fluorescent material 169 used in the projector 10 is a fluorescent material 169 that continues to emit light such as phosphorescence and delayed fluorescence even after irradiation of visible light and ultraviolet light is stopped, even if the blue light emitting diode 161B is time-division controlled. Because the reaction speed is slow, the light emitted from the specific wavelength range light generation device of another color and light are mixed, and the display element 51 is irradiated with light mixed with light of different colors. In this case, a material having a high reaction rate without emission such as phosphorescence or delayed fluorescence is used.

  The condensing lens group 164 includes a base part 171A and a convex surface part 171B protruding in front of the base part 171A, and a first lens 171 disposed in the vicinity of the front side of the fluorescent material 169 serving as the second light source 154. A second lens 172 having a diameter larger than that of the first lens 171 and disposed in front of the first lens 171; and a third lens 173 having a diameter larger than that of the second lens 172 and disposed in front of the second lens 172; And each lens is combined to exert a light collecting function.

  The first lens 171 has a concave portion 171C at a substantially central portion on the back surface of the base portion 171A, and a fluorescent material 169 serving as a second light source 154 is disposed in the concave portion 171C. A meniscus convex lens is formed by the convex surface portion 171B. The second lens 172 is a convex meniscus lens having a concave portion 172A at the substantially central portion of the back surface, and the tip of the convex surface portion 171B of the first lens 171 is positioned in the concave portion 172A. This is a convex meniscus lens having a concave portion 173A in the substantially central portion of the back surface, and the tip of the second lens is positioned in the concave portion 173A.

  The light beam in the green light generation device 151G is irradiated with the dichroic filter 168 by reflecting the blue light emitted from the blue light emitting diode 161B as the first light source 153 directly or inside the optical space 159. Is transmitted to the fluorescent material 169 used as the second light source 154. The fluorescent material 169 absorbs the energy of the irradiated light bundle, emits green light, and emits green light to the condenser lens group 164. The light beam emitted from the fluorescent material 169 to the optical space 159 side is reflected by the dichroic filter 168 and emitted to the condenser lens group 164 side.

  Further, the green light emitted to the condenser lens group 164 is condensed and transmitted through the first dichroic mirror 144 shown in FIG. 4, and further condensed by the second convex lens 145 to irradiate the second dichroic mirror 146. Then, after being reflected by the second dichroic mirror 146, the light is condensed by the third convex lens 147 on the incident surface of the light guide device 75 described later.

  As shown in FIG. 3, the optical system unit 70 is composed of three blocks, an illumination side block 78 located in the vicinity of the light source device 63, an image generation block 79, and a projection side block 80. It is arranged along the panel 15.

  The illumination side block 78 includes a part of the light source side optical system 62 that guides the light emitted from the light source device 63 to the display element 51 provided in the image generation block 79, and the illumination side block 78 includes the light source side optical system 62. There are a light guide device 75 that uses a light flux emitted from the light source device 63 as a light beam having a uniform intensity distribution, a condensing lens that collects light transmitted through the light guide device 75, and the like.

  The image generation block 79 includes an optical axis changing mirror 74 that changes the direction of the light emitted from the light guide device 75, and a plurality of sheets that collect the light reflected by the optical axis changing mirror 74 on the display element 51. The light source side lens group 83 formed by the lens and the illumination mirror 84 that irradiates the display element 51 with the light transmitted through the light source side lens group 83 at a predetermined angle are provided as the light source side optical system 62. DMD (digital micromirror device). A display element cooling device 53 for cooling the display element 51 is disposed on the rear panel 13 side of the display element 51 to prevent the display element 51 from becoming high temperature.

  Further, the projection side block 80 has a lens group of the projection side optical system 90 that emits light that is reflected by the display element 51 and forms an image to the screen. The projection side optical system 90 is built in the fixed barrel. This is a variable focus type lens having a zoom function with a fixed lens group 93 and a movable lens group 97 built in the movable lens barrel. Zoom adjustment and focus are performed by moving the movable lens group 97 by a lens motor. Adjustment is possible.

  Next, effects in the present embodiment will be described. In the optical system of the projector 10 or the like, a spatial spread in which a light beam that can be handled effectively exists can be expressed as a product of an area and a solid angle, and this product is referred to as an etendue. This etendue is a value stored in the optical system.

  In the projector 10 using the display element 51 such as the DMD as described above, the area of the illuminated area of the display element 51 is S ′, and the solid angle of incident light that can be captured by the area S ′ of the illuminated area is Ω ′. In this case, the etendue of the display element 51 is represented by S ′ × Ω ′. Further, when the area of the light emitting region of the light source device 63 is S and the solid angle of the emitted light is Ω, the etendue of the light source device 63 is expressed by S × Ω.

  Since etendue is a value stored in the optical system, when the value of etendue S × Ω of the light source device 63 is smaller than the value of etendue S ′ × Ω ′ of the display element 51, the light emitted from the light source device 63 is All of the emitted light is used as effective light, but when the value of etendue S × Ω of the light source device 63 is larger than the value of etendue S ′ × Ω ′ of the display element 51, the light is emitted from the light source device 63. Unusable light will be generated in the emitted light.

  In a projector using a conventional light emitting diode, since the light emitting amount of the light emitting diode is small, it is necessary to arrange a plurality of light emitting diodes and collect and use light bundles emitted from the plurality of light emitting diodes. When a plurality of light emitting diodes are arranged on the top, the etendue value of the light source device becomes larger than the etendue value of the display element, and the light that cannot be used increases and the use efficiency of the light emitting diodes decreases. was there.

  Further, among the light emitting diodes, the green light emitting diode has a smaller amount of light than the red light emitting diode and the blue light emitting diode, and therefore, it is necessary to arrange a larger number than the red light emitting diode and the blue light emitting diode. In this case, since the etendue value of the green light source is increased, the ratio of the effective light is decreased, and there is a problem that the shortage of green light cannot be solved.

  However, in this embodiment, the area of the light emitting region of the blue light emitting diode 161B as the first light source 153 is increased by using the fluorescent material 169 as the second light source 154 that emits green light instead of the green light emitting diode. However, since the area of the light emitting region of the second light source 154 does not increase, the area of the light emitting region of the second light source 154 is kept constant, and the number of blue light emitting diodes 161B serving as the first light source 153 is increased. The amount of light emitted from the second light source 154 can be increased by increasing the amount of light received by the second light source 154, and the amount of green light can be increased while keeping the etendue value constant. it can.

  In addition, since the amount of light can be increased while keeping the area of the light emitting area constant, the amount of light can be easily controlled by increasing the number of the first light sources 153, and the shortage of the amount of light can be easily eliminated. Further, by forming an optical space 159 in which the reflection mirror 167 is deposited on the inner surface of the front wall or the side wall, the first light source 153 is reliably guided to the second light source 154 from the first light source 153. It is also possible to increase the utilization efficiency of the light emitted from the. Therefore, it is possible to provide the projector 10 that can project a clear projected image with high brightness.

  Furthermore, since the dichroic filter 168 is provided on the back side of the second light source 154, the light from the second light source 154 can be reliably emitted forward. In addition, by arranging the condensing lens group 164 in front of the second light source 154, the emitted light from the second light source 154 is reliably guided to the subsequent optical system such as the light guide device 75 as a condensed light bundle. It can be illuminated.

  In the above-described embodiment, the blue light emitting diode 161B is used as the first light source 153. However, a solid light emitting element such as an ultraviolet light emitting diode or an organic EL can also be used as the first light source 153. Even when a solid light-emitting element such as an ultraviolet light-emitting diode or an organic EL is used as the first light source 153, the same effect as in this embodiment can be obtained. Even when a laser emitter is used as the first light source 153, the same effect as in this embodiment can be obtained when the substantial size of the laser emitter is larger than that of the second light source 154.

  Only the green light generation device 151G has a structure including the first light source 153 and the second light source 154. By appropriately selecting a light emitting diode and a fluorescent material, the red light generation device 151R and the blue light generation device 151G have a green color. It is also possible to use a specific wavelength band light generating device having the same configuration as that used in the light generating device 151G. As described above, the red light generation device 151R and the blue light generation device 151B also have the structure including the first light source 153 and the second light source 154, so that the difference in the amount of light of each color can be kept uniform.

  In the above-described embodiment, the first dichroic mirror 144 is disposed as the first dichroic device at the position where the optical axes of the green light generating device 151G and the blue light generating device 151B intersect, but as shown in FIG. In addition, a dichroic prism 189 having a prismatic shape and having a filter that reflects the emission light from the blue light generation device 151B and transmits the emission light from the green light generation device 151G can be disposed on the diagonal surface.

  Next, a plurality of modified examples relating to the green light generating device 151G of the present embodiment will be described. The green light generating device 151G according to the first modification is the one in which the first light source 153 is arranged on the back side of the flat fluorescent material 169 as the second light source 154 as in the above-described embodiment. As shown in FIG. 8, the first light source 153 of the light generating device 151G is formed by arranging blue light emitting diodes 161B having a small light emitting area on the first light source mounting substrate 165 in parallel. Thus, by using a plurality of blue light emitting diodes 161B as the first light source 153, the amount of light emitted from the second light source 154 can be increased, and a surface-mounted light emitting diode having a large area of an expensive light emitting region is used. Since it is not necessary, the light source device 63 can be manufactured at low cost, and the cost of the projector 10 can be reduced.

  The green light generation device 151G according to the second modification is similar to the first modification, in which the first light source 153 is disposed on the back side of the flat fluorescent material 169 serving as the second light source 154. As shown in FIG. 9, the optical space forming member 166 of the green light generating device 151G includes a front wall having an area smaller than the area of the light emitting region of the blue light emitting diode 161B as the first light source 153, It has a substantially quadrangular pyramid shape with a slanted side wall formed so as to widen from the vicinity of the outer peripheral edge toward the back side, and forms an optical space 159 having a substantially quadrangular pyramid shape, and is formed on the inner surface of the front wall. A dichroic filter 168 is vapor-deposited, and a reflection mirror 167 is vapor-deposited on the inner surface of the oblique side wall.

  Thus, by forming the front upper surface wall of the optical space forming member 166 to be small, it is not necessary to deposit both the reflection mirror 167 and the dichroic filter 168 on the front wall, so that the optical space forming member 166 can be easily manufactured. In addition, since the manufacturing process can be reduced, the time and cost for manufacturing the light source device 63 can be reduced. Furthermore, since the optical space forming member 166 has a substantially square frustum shape, it is smaller than the box-shaped optical space forming member 166 described in the embodiment, and the light source device 63 can be downsized.

  The green light generating device 151G according to the third modified example is one in which the first light source 153 is arranged on the back side of the flat fluorescent material 169 as the second light source 154, as in the second modified example. In the case where the optical space forming member 166 having a substantially quadrangular pyramid shape formed from the front wall and the oblique side wall according to the second modification is used, the area of the light emitting region is small as the first light source 153 as shown in FIG. It has a plurality of light sources, that is, a plurality of blue light emitting diodes 161B, the predetermined light source is disposed in parallel with the front wall of the optical space forming member 166, and the other light sources are disposed substantially perpendicular to the oblique side wall. is there. Note that the length of the oblique side wall is shorter than the length of the oblique side wall of the optical space forming member 166 described in the second modification, and the front wall has a large area. Therefore, the reflection mirror 167 is deposited on the front wall on the periphery of the dichroic filter 168, and the emitted light from the first light source 153 irradiated to a position other than the dichroic filter 168 on the front wall is reflected.

  Thus, by forming the first light source 153 from a plurality of light sources having a small area of the light emitting region, the amount of light irradiated to the second light source 154 can be increased, and the amount of light emitted from the second light source 154 can be increased. In addition, since it is not necessary to use a surface mount type light emitting diode having a large area of an expensive light emitting region, an inexpensive projector 10 can be provided. Further, since the distance between the second light source 154 and the first light source 153 is shortened, the attenuation of light can be suppressed to be small, and the utilization efficiency of the light emitted from the first light source 153 can be increased.

  Similar to the third modified example, the green light generating device 151G according to the fourth modified example is one in which the first light source 153 is disposed on the back side of the flat phosphor 169 serving as the second light source 154. As shown in FIG. 11, the green light generation device 151G uses a substantially rectangular parallelepiped glass rod as an optical space forming member 166 that forms an optical space 159, and a first light source on the incident surface side of the glass rod. A blue light emitting diode 161B as 153 is disposed, and a flat fluorescent material 169 serving as the second light source 154 is disposed on the emission surface. Further, a dichroic filter 168 that transmits the light emitted from the first light source 153 and reflects the light emitted from the second light source 154 is deposited at the center of the exit surface of the glass rod, and the dichroic deposited on the exit surface of the glass rod. A reflection mirror 167 is deposited on the periphery of the filter 168.

  By using a glass rod as the optical space forming member 166 that forms the optical space 159 in this way, the glass rod has no light attenuation when the light is reflected. Therefore, the use efficiency of the light emitted from the first light source 153 is improved. Thus, it is possible to provide the projector 10 that can be increased and can perform projection with high brightness.

  Similar to the third modification, the green light generation device 151G according to the fifth modification has a first light source 153 disposed on the back side of a flat phosphor 169 serving as a second light source 154. As shown in FIG. 12, the green light generating device 151G includes a blue light emitting diode 161B having a first light source 153 as a back light source and a blue light emitting diode 161B as a side light source, and an optical space 159 having a back light source and a side surface. It is a space surrounded by a light source. In addition, a light transmitting plate 181 is disposed above the optical space 159. The light emitted from the first light source 153 is transmitted through the central portion of the lower surface of the light transmitting plate 181, and the light emitted from the second light source 154 is reflected. The dichroic filter 168 is vapor-deposited, the reflection mirror 167 is vapor-deposited on the periphery of the dichroic filter 168, and the flat fluorescent material 169 serving as the second light source 154 is disposed at the center of the upper surface of the translucent plate 181. is there.

  Since the first light source 153 is formed of the back light source and the side light source and the optical space 159 is a space surrounded by the bottom light source and the side light source, the light emission amount of the first light source 153 increases. The amount of light applied to the two light sources 154 increases, the amount of light emitted from the fluorescent material 169 as the second light source 154 can be increased, and the shortage of the amount of green light can be solved.

  The green light generating device 151G according to the sixth modification is one in which the first light source 153 is disposed on the front side and the back side of the flat fluorescent material 169 that is the second light source 154. As shown in FIG. 13, the green light generating device 151G includes a first light source 153, a second light source 154, and a prismatic shape, and the light emitted from the first light source 153 is reflected diagonally, and the second light source 154 The emitted light includes a first dichroic prism 166A having a filter surface through which light is transmitted, and a glass rod 166B disposed so as to be close to the exit surface of the first dichroic prism 166A.

  The first dichroic prism 166A has two incident surfaces that are the same region defined by the filter surface and located in a region different from the region where the exit surface is located.

  The first light source 153 includes two light sources, that is, two blue light emitting diodes 161B. The first light source 153 disposed on the front side of the second light source 154 has an angle of 90 degrees with the optical axis of the second light source 154. The first light source 153 disposed near the incident surface on the side surface side of the first dichroic prism 166A and the rear surface side of the second light source 154 is disposed so that the optical axis overlaps with the second light source 154. It is what.

  A translucent plate 181 is disposed between the first light source 153 and the second light source 154 disposed on the back side of the second light source 154, and the first light source 153 side surface of the translucent plate 181 is disposed on the first light source 154 side. A dichroic filter 168 that transmits light emitted from the light source 153 and reflects light emitted from the second light source 154 is deposited. Although not shown, a condensing lens group is disposed near the exit surface of the glass rod 166B.

  Then, the emitted light from the first light source 153 disposed on the back side of the second light source 154 is transmitted through the dichroic filter 168 and the light transmitting plate 181 and irradiated to the fluorescent material 169, and is disposed in the vicinity of the other incident surface. The emitted light from the first light source 153 is reflected by the filter surface of the first dichroic prism 166A and applied to the fluorescent material 169, and the fluorescent material 169 used as the second light source 154 irradiated with these lights becomes green. Light is emitted and green light is emitted. The green light passes through the filter of the first dichroic prism 166A, enters the glass rod 166B, and is emitted to the outside from the emission surface of the glass rod 166B.

  Thus, by arranging the first light source 153 in the vicinity of the two incident surfaces of the first dichroic prism 166A, the amount of light irradiated to the second light source 154 can be increased, and the projector 10 capable of projecting a high-luminance image. Can provide. Further, since the two light sources forming the first light source 153 are arranged in a vertical relationship with each other, the green light generating device 151G can be downsized, and the light source device 63 and the projector 10 can be downsized. Is.

  Further, since the first dichroic prism 166A and the glass rod 166B are disposed in front of the second light source 154, the first dichroic prism 166A and the glass rod 166B have no light attenuation due to reflection inside, and the second light source 154 It is also possible to increase the utilization efficiency of the light emitted from the.

  A green light generation device 151G according to the seventh modification is similar to the sixth modification in that the first light source 153 is arranged on the front side and the back side of the flat fluorescent material 169 serving as the second light source 154. is there.

  As shown in FIG. 14, the green light generation device 151G includes a first light source 153, a second light source 154, and an auxiliary second light source 156 that emits light of the same color as the second light source 154 and a slightly different wavelength. A green light emitting diode 161G as a first prism, and a first dichroic prism 166A having a filter surface that reflects the light emitted from the first light source 153 and transmits the light emitted from the second light source 154 diagonally in a prismatic shape, It has a prismatic shape and has a filter surface that transmits light emitted from the second light source 154 diagonally and reflects light from the auxiliary second light source 156, and is disposed close to the emission surface of the first dichroic prism 166A. It comprises a second dichroic prism 166C and a glass rod 166B disposed in the vicinity of the exit surface of the second dichroic prism 166C.

  The first dichroic prism 166A has two incident surfaces that are the same region defined by the filter surface and different from the region where the exit surface is located, and the second dichroic prism 166C The surface that faces the exit surface and one surface of the rectangular shape that is located in the same region as the exit surface in the two regions defined by the filter surface are used as the entrance surface.

  The first light source 153 includes two light sources, that is, two blue light emitting diodes 161B. The first light source 153 disposed on the front side of the second light source 154 has an angle of 90 degrees with the optical axis of the second light source 154. The auxiliary second light source 156 is disposed near the incident surface on the side surface side of the first dichroic prism 166A so as to form an angle of 90 degrees with the optical axis of the second light source 154. The first light source 153 disposed near the surface and disposed on the back side of the second light source 154 is disposed so that the optical axis of the second light source 154 overlaps.

  A translucent plate 181 is disposed between the first light source 153 and the second light source 154 disposed on the back side of the second light source 154, and the first light source 153 side surface of the translucent plate 181 is disposed on the first light source 154 side. A dichroic filter 168 that transmits light emitted from the light source 153 and reflects light emitted from the second light source 154 is deposited. Although not shown, a condensing lens group is disposed near the exit surface of the glass rod 166B.

  By arranging the auxiliary second light source 156 in the vicinity of the second dichroic prism 166C in this way, in addition to the green light emitted from the second light source 154, the green light emitted from the auxiliary second light source 156 is also converted into green light. Therefore, it is possible to provide the projector 10 capable of solving the shortage of the amount of green light and projecting a clear projection image.

  The green light generating device 151G according to the eighth modification is similar to the seventh modification in that the first light source 153 is arranged on the front side and the back side of the flat fluorescent material 169 as the second light source 154. is there. Then, as shown in FIG. 15, the green light generating device 151G has a blue light emitting diode 161B and an optical space forming member 166 as the first light source 153 described in the embodiment on the back side of the flat plate-like second light source 154. And a blue light emitting diode 161B serving as the first light source 153 is disposed in the vicinity of the bottom of the convex surface portion 171B of the first lens 171 included in the condenser lens group 164 disposed on the front surface side of the second light source 154. Is.

  A dichroic filter is formed on the outer surface of the convex surface portion 171B of the first lens 171 so that light emitted from the first light source 153 is reflected and light emitted from the second light source 154 is transmitted. A concave portion 171C is formed in the substantially central portion of the back surface, and the second light source 154 is disposed in the concave portion 171C.

  The green light generating device 151G includes light emitted from the first light source 153 disposed on the back side of the second light source 154 and light emitted from the first light source 153 disposed on the front side of the second light source 154. Is irradiated to the second light source 154, and since the dichroic filter is disposed on the outer surface of the convex surface portion 171B of the first lens 171, the first lens 171 in the light emitted from the first light source 153. The light irradiated to the convex surface portion 171B is also reflected by the convex surface portion 171B of the first lens 171 and irradiated to the second light source 154. In addition, the vicinity of the position where the first light source 153 of the convex surface portion 171B of the first lens 171 is disposed is a transmission portion, and no dichroic filter is formed.

  According to the green light generating device 151G, in addition to the light emitted from the first light source 153 disposed on the back side of the second light source 154, the light emitted from the first light source 153 disposed on the front surface side of the second light source 154. Since the fluorescent material 169 is also irradiated with light, the amount of green light emitted from the second light source 154 can be increased, and the shortage of green light can be solved.

  As shown in FIG. 16, a plurality of blue light emitting diodes 161B can be arranged in the vicinity of the first lens 171 as the first light source 153 arranged on the front surface side of the second light source 154. The amount of light emitted from the second light source 154 can be increased. Further, although the dichroic filter is formed on the outer surface of the convex surface portion 171B of the first lens 171, the amount of light from the second light source 154 can be increased without forming the dichroic filter.

  The green light generating device 151G according to the ninth modified example arranges the first light source 153 on the front side and the back side of the flat fluorescent material 169 as the second light source 154, as in the eighth modified example. is there. Then, as shown in FIG. 17, the green light generating device 151G has a blue light emitting diode 161B and an optical space forming member 166 as the first light source 153 described in the embodiment on the back side of the flat plate-like second light source 154. And a blue light emitting diode 161B serving as the first light source 153 is disposed near the side surface of the base portion 171A of the first lens 171 provided in the condenser lens group 164 disposed on the front surface side of the second light source 154. A flat plate-like second light source 154 is arranged close to the center of the back side of the base portion 171A of the first lens 171.

  The base portion 171A of the first lens 171 has a semi-conical trapezoidal surface shape formed from an oblique side surface that covers the upper side of the second light source 154 and a boundary surface located at the boundary between the base portion 171A and the convex surface portion 171B. Thus, a dichroic filter 185 that reflects light emitted from the first light source 153 and transmits light emitted from the second light source 154 is provided.

  According to the green light generation device 151G, the light emitted from the first light source 153 disposed on the front surface side of the second light source 154 is reflected by the dichroic filter 185 and irradiated to the second light source 154. The use efficiency of the light emitted from the light source 153 is increased, and light is emitted to the second light source 154 from both the front side and the back side of the second light source 154. Therefore, the amount of green light emitted can be increased, and the green light can be increased. Can solve the shortage of light.

  The green light generating device 151G according to the tenth modification is such that the first light source 153 is disposed only on the front side of the flat fluorescent material 169 serving as the second light source 154. As shown in FIG. 18, the green light generating device 151G includes a first lens 171 having a base portion 171A and a convex surface portion 171B protruding upward from the upper surface of the base portion 171A, and a front side of the first lens 171. A condensing lens group 164 having a second lens 172 arranged and a third lens 173 arranged in front of the second lens 172, and a first light source in the vicinity of the side surface of the base portion 171A of the first lens 171 A blue light emitting diode 161B, 153, is disposed, and a flat plate-like second light source 154 is disposed in the vicinity of the center of the back surface of the base portion 171A.

  In addition, a dichroic filter that reflects the light emitted from the first light source 153 and transmits the light emitted from the second light source 154 is formed at the boundary portion between the side surface of the base portion 171A and the convex surface portion 171B of the first lens 171. It is what has been.

  According to the green light generating device 151G, the second light source 154 emits green light by irradiating the light emitted from the first light source 153 from the front side of the flat plate-like second light source 154. Since it is easy to arrange one light source 153, it is easy to manufacture, it is possible to eliminate the shortage of green light, and it is also easy to increase the number of blue light emitting diodes 161B as the first light source 153 It will be.

  Although the dichroic filter is disposed on the outer surface of the convex surface portion 171B of the first lens 171, the same effect can be obtained without the dichroic filter.

  Similar to the tenth modification, the green light generation device 151G according to the eleventh modification is configured such that the first light source 153 is disposed only on the front side of the flat phosphor 169 serving as the second light source 154. is there. As shown in FIG. 19, the green light generating device 151G has a truncated cone part 171D formed with a smaller area on the back side than an area on the front side, and a convex surface part 171B protruding forward of the truncated cone part 171D. A first light source including a condenser lens group 164 having a first lens 171, a second lens 172 disposed in front of the first lens 171, and a third lens 173 disposed in front of the second lens 172; A plurality of blue light emitting diodes 161B, 153, are arranged in the vicinity of the side surface of the truncated cone part 171D of the first lens 171 and a plate-like fluorescent material 169, which is the second light source 154, is arranged in the vicinity of the center of the bottom surface. It is what.

  A dichroic filter is formed on the outer surface of the convex surface portion 171B of the first lens 171 so that light emitted from the first light source 153 is reflected and light emitted from the second light source 154 is transmitted. The light beam emitted from 153 is irradiated onto the convex surface portion 171B of the first lens 171 and reflected by the dichroic filter of the convex surface portion 171B to be irradiated onto the second light source 154. Furthermore, the angle between the side surface of the truncated cone portion 171D of the first lens 171 and the incident surface of the convex surface portion 171B is such that the light emitted from the first light source 153 is reflected by the dichroic filter of the convex surface portion 171B. The angle is adjusted so as to be condensed.

  According to such a green light generating device 151G, the light beam emitted from the first light source 153 is converged on the second light source 154 by the dichroic filter of the convex surface portion 171B of the first lens 171. The utilization efficiency of the emitted light can be increased, and the green light generating device 151G can be downsized.

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

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. FIG. 3 is a diagram illustrating a functional circuit block of the projector according to the embodiment of the invention. FIG. 3 is a top view of the projector according to the embodiment of the present invention with the top panel removed. Sectional drawing of the light source device which concerns on the Example of this invention. Sectional drawing of the green light production | generation apparatus which concerns on the Example of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the Example of this invention. Sectional drawing of the other light source device which concerns on the Example of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 1st modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 2nd modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 3rd modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 4th modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 5th modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 6th modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 7th modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 8th modification of this invention. The partial expanded sectional view of the other green light production | generation apparatus which concerns on the 8th modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 9th modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 10th modification of this invention. The partial expanded sectional view of the green light production | generation apparatus which concerns on the 11th modification of this invention.

Explanation of symbols

10 Projector 11 Top panel
12 Front panel 13 Back panel
14 Right panel 15 Left panel
17 Exhaust hole 18 Intake hole
19 Lens cover 20 Various terminals
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Light source control circuit 43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 51 Display element
53 Display element cooling device 62 Light source side optical system
63 Light source device 70 Optical system unit
74 Optical axis change mirror 75 Light guide device
78 Lighting block 79 Image generation block
80 Projection side block 83 Light source side lens group
84 Irradiation mirror 90 Projection side optical system
93 Fixed lens group 97 Movable lens group
101 Power circuit block 102 Light source control circuit board
103 Control circuit board 110 Blower
111 Suction port 113 Discharge port
114 Exhaust temperature reduction device 120 Partition wall
121 Inlet side space 122 Exhaust side space
142 Red light reflecting mirror 143 First convex lens
144 First dichroic mirror 145 Second convex lens
146 Second dichroic mirror 147 Third convex lens
151B Blue light generator 151G Green light generator
151R Red light generator 153 First light source
154 Second light source 156 Auxiliary second light source
159 Optical space 161B Blue light emitting diode
161G Green light emitting diode 161R Red light emitting diode
162 Light source holder 163 Cover member
164 Condensing lens group 165 First light source mounting board
166 Optical space forming member 166A First dichroic prism
166B Glass rod 166C Second dichroic prism
167 Reflective mirror 168 Dichroic filter
169 Fluorescent substance 171 First lens
171A Base part 171B Convex part
171C Concave part 171D Frustum part
172 Second lens 172A Concave
173 Third lens 173A Concave
181 Translucent plate 185 Dichroic filter
189 dichroic prism

Claims (17)

  A first light source that converts electrical energy into light; and a second light source that receives light emitted from the first light source and emits light having a spectral distribution different from that emitted from the first light source. A light source device, wherein an area of a light emitting region of one light source is formed wider than an area of a light emitting region of a second light source.   The light source device according to claim 1, wherein the first light source is formed of a solid light emitting element.   The light source device according to claim 1, wherein the first light source is formed of a light emitting diode.   The light source device according to any one of claims 1 to 3, wherein the second light source is formed of a fluorescent material.   The light source device according to claim 4, wherein the first light source is disposed on a back side of the second light source.   The light source device according to claim 4, wherein the first light source is disposed on a front side of the second light source.   The light source device according to claim 4, wherein the first light source is disposed on a front side and a back side of the second light source.   An optical space for guiding light emitted from the first light source to the second light source is provided, the first light source is disposed inside the optical space, and the optical space is disposed on the back side of the second light source. The light source device according to claim 5, wherein the light source device is a light source device.   A dichroic filter that transmits the light emitted from the first light source and reflects the light emitted from the second light source is disposed at the second light source position on the inner surface of the wall surface that forms the optical space. The light source device according to claim 8.   The light source device according to claim 9, wherein the wall surface forming the optical space includes a reflection surface on an inner surface excluding a portion where the dichroic filter is disposed.   The dichroic filter that reflects the light emitted from the first light source together with the first light source and transmits the light emitted from the second light source is disposed on the front side of the second light source. The light source device according to claim 6 or 7.   The light source device according to claim 4, further comprising a condensing lens group having an optical axis combined with an optical axis of the second light source in front of the second light source.   Having a first light source around the condenser lens group aligned with the optical axis of the second light source, reflecting the emitted light from the first light source to any lens surface of the condenser lens group; The light source device according to claim 12, wherein a dichroic filter that transmits light emitted from the second light source is formed. The first light source having an optical axis of 90 degrees and the optical axis of the second light source is emitted to the front surface side of the second light source, and light having the same color as the second light source and a wavelength slightly different from the second light source is emitted. An auxiliary second light source having an optical axis of two light sources and an optical axis of 90 degrees;
In the vicinity of the position where the optical axes of the first light source and the second light source intersect, the light emitted from the first light source arranged so as to intersect with both optical axes at an angle of 45 degrees is reflected and emitted from the second light source. A dichroic filter that transmits light is arranged,
In the vicinity of the position where the optical axis of the auxiliary second light source and the second light source intersects, light emitted from the auxiliary second light source arranged so as to intersect with both optical axes at an angle of 45 degrees is reflected and from the second light source. 8. The light source device according to claim 6, wherein a dichroic filter that transmits the emitted light is disposed.   Blue light generating device in which the second light source is formed of a blue fluorescent material, green light generating device in which the second light source is formed of a green fluorescent material, and red light in which the second light source is formed of a red fluorescent material The light source device according to claim 1, wherein the light source device can emit light of three primary colors of blue, green, and red by including the generation device.   A green light generating device having the first light source by a blue light emitting diode and the second light source by a green fluorescent material, a blue light generating device having a light source as a blue light emitting diode, and a red light generating device having a light source as a red light emitting diode. The light source device according to any one of claims 1 to 14, wherein light emission of three primary colors of blue, green, and red is enabled. A light source device, a light guide device, a display element, a projection side optical system, and a projector control means,
The projector according to claim 15 or 16, wherein the light source device is the light source device according to claim 15 or 16.

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