JP6332678B2 - Light source device and projection device - Google Patents

Light source device and projection device Download PDF

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JP6332678B2
JP6332678B2 JP2014108870A JP2014108870A JP6332678B2 JP 6332678 B2 JP6332678 B2 JP 6332678B2 JP 2014108870 A JP2014108870 A JP 2014108870A JP 2014108870 A JP2014108870 A JP 2014108870A JP 6332678 B2 JP6332678 B2 JP 6332678B2
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light
light source
fluorescent plate
emitted
wavelength band
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JP2015225152A (en
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弘樹 増田
弘樹 増田
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カシオ計算機株式会社
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  The present invention relates to a projection device and a light source device suitable for the projection 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 (digital micromirror device) or a liquid crystal plate to display a color image on a screen.

  Projectors that are projection devices have been used for a wide range of applications from business presentations to home use with the spread of video equipment such as personal computers and DVD players. Conventionally, projectors using a high-intensity discharge lamp as the light source have been the mainstream in such projectors. However, in recent years, projectors using semiconductor light-emitting elements such as light-emitting diodes and laser diodes as light sources, and excitation light have been irradiated. Thus, various projectors including a fluorescent plate device such as a fluorescent wheel having a phosphor layer that emits fluorescent light have been developed.

  In Patent Document 1, a semiconductor laser that emits blue laser light, an LED that emits red light, a phosphor that emits green using the laser light of the semiconductor laser as excitation light, and a diffusion unit that diffuses blue laser light A data projector apparatus as a projection apparatus including a wheel is disclosed. Each of these color lights is aligned with the same optical axis by a dichroic mirror that transmits blue light and red light and reflects green light, and a dichroic mirror that transmits blue light and reflects red light and green light. The mirror element is irradiated.

  Thus, in order to make the light of each light source having a different wavelength have the same optical axis, one is transmitted by the dichroic mirror and the other is reflected so that the optical axis and the traveling direction of the reflected light and the transmitted light are matched. To synthesize.

JP 2011-70127 A

  Here, if the dichroic mirror is configured to transmit one light and reflect the other light with respect to two lights having overlapping wavelength bands, the light in the region where the wavelength bands overlap among the other reflected lights. May become invalid light. In the projection apparatus disclosed in Patent Document 1, in a dichroic mirror that transmits blue light and red light and reflects green light, light in a region overlapping with red light in the wavelength region of green light is reflected by the dichroic mirror. Therefore, it becomes invalid light without being used for image formation. Therefore, the utilization efficiency of green light is poor.

  Therefore, an object of the present invention is to provide a light source device and a projection device that reduce the ineffective light that is not used for image formation and improve the utilization efficiency of the light source light.

  The light source device of the present invention includes a first light source, a phosphor layer that uses the emitted light from the first light source as excitation light, a region that transmits or diffuses and transmits the emitted light from the first light source, And a second light source disposed opposite to the first light source with the fluorescent plate interposed therebetween.

  The projection device of the present invention is the above-described light source device, a display element that is irradiated with light source light from the light source device to form image light, and a projection side that projects the image light emitted from the display element onto a screen. It has an optical system, the said display element, and the projection apparatus control means which controls the said light source device, It is characterized by the above-mentioned.

  According to the present invention, it is possible to reduce the light emitted from the light source that is regarded as invalid light without being used for image formation, so that the utilization efficiency of the light source light can be improved.

It is an external appearance perspective view which shows the projector which concerns on embodiment of this invention. It is a figure which shows the functional block of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on embodiment of this invention. It is a figure which shows the wavelength distribution and light intensity of each color wavelength band light of the projector which concerns on embodiment of this invention. It is a figure which shows the transmittance | permeability of the 1st dichroic mirror in the projector which concerns on embodiment of this invention, the wavelength distribution of each color wavelength band light transmitted or reflected by the 1st dichroic mirror, and light intensity.

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

  As shown in FIG. 1, the projection device 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 side plate in front of the housing of the projection device 10. 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.

  Further, a key / indicator unit 37 is provided on the top panel 11 of the casing, and 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 device, a display element, a control circuit or the like is overheated are arranged.

  In addition, an input / output connector portion provided with a D-SUB terminal, an S terminal, an RCA terminal, an audio output terminal, and the like for inputting a video signal to which a USB terminal or an analog RGB video signal is input to the rear panel is provided on the rear surface of the housing; Various terminals (group) 20 such as a power adapter plug are provided. In addition, a plurality of intake holes are formed in the back panel. A plurality of exhaust holes 17 are formed in the right side panel, which is a side plate of the casing (not shown), and the left side panel 15 and the front panel 12, which are side plates shown in FIG. An intake hole 18 is also formed in the corner of the left panel 15 near the rear panel and the rear panel 13.

  Next, the projection device control means of the projection device 10 will be described with reference to the functional block diagram of FIG. The projection device control means includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like.

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

  The image signal of various standards input from the input / output connector unit 21 by the projection device 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 the 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 driving unit 26.

  The display driving unit 26 functions as a display element control unit, and drives the display element 51 that is a spatial light modulation element (SOM) at an appropriate frame rate in accordance with the image signal output from the display encoder 24. By irradiating the display element 51 with a light beam emitted from the light source device 60 via a light source side optical system, which will be described later, an optical image is formed with the reflected light of the display element 51, and the projection side optical system is The image is projected and displayed on a screen (not shown). The movable lens group 235 of the projection side optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman encoding, 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 each image data constituting a series of moving images in units of one frame, and converts the image data into an image conversion Based on the image data that is output to the display encoder 24 via the unit 23 and stored in the memory card 32, a process for enabling display of a moving image or the like 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.

  Further, the control unit 38 controls a light source control circuit 41 as a light source control unit, and the light source control circuit 41 is configured so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. Individual control for emitting light in the red, green, and blue wavelength bands of the light source device 60 is performed.

  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 device 60 and the like, and controls the rotation speed of the cooling fan based on the temperature detection result. Further, the control unit 38 causes the cooling fan drive control circuit 43 to maintain the rotation of the cooling fan even after the projection apparatus 10 body is turned off by a timer or the like, or depending on the result of temperature detection by the temperature sensor, Control such as turning off the power is also performed.

  Next, the internal structure of the projection apparatus 10 will be described with reference to FIG. FIG. 3 is a schematic plan view showing the internal structure of the projection apparatus 10. The projection apparatus 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 projection device 10 includes a light source device 60 at the side of the control circuit board 241, that is, at a substantially central portion of the housing of the projection device 10. Further, in the projector 10, a light source side optical system 170 and a projection side optical system 220 are disposed between the light source device 60 and the left panel 15.

  The light source device 60 is a light source of blue wavelength band light as a first light source, and an excitation light irradiation device 70 that is also used as an excitation light source, and a red light source that is a light source of red wavelength band light as a second light source. The apparatus 120 and the green light source device 80 used as the light source of green wavelength band light are provided. The green light source device 80 includes an excitation light irradiation device 70 and a fluorescent plate device 100 including a fluorescent plate such as a fluorescent wheel. The light source device 60 is provided with a light guiding optical system 140 that guides and emits light of each wavelength band of red, green, and blue. The light guide optical system 140 condenses each color wavelength band light emitted from each color light source device to the entrance of the light tunnel 175 via the condenser lens 173.

  The excitation light irradiation device 70 as the first light source is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the housing of the projection device 10. The excitation light irradiation device 70 includes a light source group including a blue laser diode 71 that is a plurality of semiconductor light emitting elements arranged so that the optical axis is parallel to the back panel 13, and light emitted from each blue laser diode 71. Reflective mirror group 75 that converts the axis 90 degrees in the direction of the front panel 12, a condensing lens 78 that collects the emitted light from each blue laser diode 71 reflected by the reflective mirror group 75, and the blue laser diode 71 and the right panel 14 and the like.

  The light source group includes a plurality of blue laser diodes 71 arranged in a matrix. On the optical axis of each blue laser diode 71, a collimator lens 73 that converts the light emitted from each blue laser diode 71 into parallel light is arranged so as to enhance the directivity of each emitted light. In addition, the reflecting mirror group 75 is formed by aligning a plurality of reflecting mirrors in a stepped manner and integrated with the mirror substrate 76 to adjust the position, and uniformizes the cross-sectional area of the light beam emitted from the blue laser diode 71. The image is reduced in the direction and emitted to the condenser lens 78.

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

  The fluorescent plate device 100 constituting the green light source device 80 is disposed on the optical path of the excitation light emitted from the excitation light irradiation device 70 and in the vicinity of the front panel 12. The fluorescent plate device 100 is rotated in parallel with the front panel 12, that is, the fluorescent plate 101 such as a fluorescent wheel arranged so as to be orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and the fluorescent plate 101. A driving lens 110 and a condensing lens group 107 that condenses the light bundle of excitation light emitted from the excitation light irradiation device 70 on the fluorescent plate 101 and collects the light bundle emitted from the fluorescent plate 101 toward the rear panel 13. And a condensing lens 115 that condenses the light beam emitted from the fluorescent plate 101 toward the front panel 12. A cooling fan 261 is disposed between the motor 110 and the front panel 12, and the fluorescent plate device 100 and the like are cooled by the cooling fan 261.

  The fluorescent plate 101 includes a fluorescent light emitting region that receives emission light from the excitation light irradiation device 70 via the condenser lens group 107 as excitation light and emits fluorescent light in a green wavelength band, and an excitation light irradiation device as a first light source. A region that transmits or diffuses and transmits excitation light that is emitted from 70 is continuously provided in the circumferential direction.

  The substrate of the fluorescent plate 101 is a metal substrate made of copper, aluminum, or the like. An annular groove is formed on the surface of the substrate on the side of the excitation light irradiation device 70, and the bottom of the groove is formed by silver evaporation or the like. The mirror is processed, and a green phosphor layer is laid on the mirrored surface. Further, when the excitation light is transmitted or diffused and transmitted, the transparent substrate having translucency is inserted into the cut-out hole portion of the substrate. In the case of a region that diffuses and permeates, a transparent base material having a surface with fine irregularities formed by sandblasting or the like is inserted.

  When the blue wavelength band light as excitation light from the excitation light irradiation device 70 serving as the first light source is irradiated on the green phosphor layer of the phosphor plate 101, the phosphor layer of the phosphor plate 101 is green in the green phosphor layer. The phosphor is excited and emits green wavelength band light from the green phosphor in all directions. The fluorescent light bundle is emitted toward the rear panel 13 and enters the condenser lens group 107. On the other hand, the blue wavelength band light from the excitation light irradiating device 70 that is incident on the region that is transmitted or diffused and transmitted through the fluorescent plate 101 is transmitted or diffused through the fluorescent plate 101, and the back side of the fluorescent plate 101 (in other words, the front panel 12. Is incident on the condensing lens 115 arranged on the side). In addition, the red wavelength band light from the red light source device 120 that is the second light source that is incident on a region that is transmitted or diffused and transmitted through the fluorescent plate 101 is transmitted or diffused and transmitted through the fluorescent plate 101 (in other words, the front side of the fluorescent plate 101 (in other words, For example, the light enters the condenser lens group 107 arranged on the rear panel 13 side.

  The red light source device 120 serving as the second light source is disposed to face the excitation light irradiation device 70 serving as the first light source with the fluorescent plate device 100 interposed therebetween. The red light source device 120 includes a red light source 121 disposed so that the optical axis is orthogonal to the blue laser diode 71, and a condensing lens group 125 that condenses light emitted from the red light source 121. The red light source 121 is a red light emitting diode that is a semiconductor light emitting element that emits light in a red wavelength band. In the red light source device 120, the optical axis of the red wavelength band light emitted from the red light source device 120 is the optical wavelength axis of the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent plate 101. It is arranged to be the same. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the front panel 12 side of the red light source 121. A cooling fan 261 is disposed on the right panel 14 side of the heat sink 130, and the red light source 121 is cooled by the cooling fan 261 and the heat sink 130.

  The light guide optical system 140 includes a condensing lens that condenses the light bundles of the red, green, and blue wavelength bands, and a reflection mirror that converts the optical axes of the light bundles of the respective color wavelength bands into the same optical axis, It consists of a dichroic mirror. Specifically, the light guide optical system 140 transmits blue wavelength band light that is emitted from the excitation light irradiation device 70 between the excitation light irradiation device 70 as the first light source and the fluorescent plate device 100. The green wavelength band light that is the emitted light from the fluorescent plate device 100 and the red wavelength band that is the emitted light from the red light source device 120 as the second light source that is transmitted or diffused through the fluorescent plate 101 of the fluorescent plate device 100 A first dichroic mirror 141 that reflects light is disposed. The reflection of the green wavelength band light and the red wavelength band light by the first dichroic mirror 141 is performed by converting the optical axis by 90 degrees toward the left panel 15.

  A condenser lens 149 is disposed on the left panel 15 side of the first dichroic mirror 141. Further, a second dichroic mirror 148 is disposed on the left panel 15 side of the condenser lens 149 and on the optical axis of the light beam reflected by the first dichroic mirror 141. Similar to the first dichroic mirror 141, the second dichroic mirror 148 transmits the blue wavelength band light that is the emitted light from the excitation light irradiation device 70, and the green wavelength band that is the emitted light from the fluorescent plate device 100. The light and the red wavelength band light that is the light emitted from the red light source device 120 as the second light source that is transmitted or diffused and transmitted through the fluorescent plate 101 of the fluorescent plate device 100 are reflected. The reflection of the green wavelength band light and the red wavelength band light by the second dichroic mirror 148 is performed by converting the optical axis by 90 degrees in the direction of the back panel 13.

  Further, on the optical axis of the blue wavelength band light that has been transmitted or diffused through the fluorescent plate 101 and the red wavelength band light that is emitted from the red light source device 120, that is, the red light source device used as the second light source. A third dichroic mirror 143 is disposed between the first and second sensors 120. The third dichroic mirror 143 reflects the blue wavelength band light, which is the emitted light from the excitation light irradiation device 70 as the first light source that is transmitted or diffused through the fluorescent plate 101 of the fluorescent plate device 100, and is a second light source. The red wavelength band light which is the emitted light from the red light source device 120 is transmitted. The reflection of the blue wavelength band light by the third dichroic mirror 143 is performed by converting the optical axis by 90 degrees toward the left panel 15.

  A condensing lens 146 is disposed on the left panel 15 side of the third dichroic mirror 143. A reflective mirror 145 is disposed on the left panel 15 side of the condenser lens 146. A condenser lens 147 is disposed on the rear panel 13 side of the reflection mirror 145.

  With the light guide optical system 140 configured in this manner, light of each color wavelength band of red, green, and blue is incident on the condenser lens 173 of the light source side optical system 170. That is, the blue wavelength band light emitted from the excitation light irradiation device 70 as the first light source passes through the first dichroic mirror 141, and is transmitted through the condensing lens group 107 and the fluorescent plate 101 or is diffused and transmitted. The light is reflected by the third dichroic mirror 143 through the optical lens 115. Then, the blue wavelength band light is reflected by the reflection mirror 145 through the condenser lens 146, passes through the second dichroic mirror 148 through the condenser lens 147, and enters the condenser lens 173.

  Further, the green wavelength band light that is the emitted light from the fluorescent plate device 100 is reflected by the first dichroic mirror 141 and reflected by the second dichroic mirror 148 via the condenser lens 149. Incident. The red wavelength band light, which is emitted from the red light source device 120 as the second light source, passes through the condenser lens 115, the region that is transmitted or diffused through the fluorescent plate 101, and the condenser lens group 107, and then the first dichroic. The light is reflected by the mirror 141, reflected by the second dichroic mirror 148 through the condenser lens 149, and enters the condenser lens 173.

  The light source side optical system 170 includes a condenser lens 173, a light tunnel 175, a condenser lens 178, an optical axis conversion mirror 181, a condenser lens 183, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 emits the image light emitted from the display element 51 disposed on the back panel 13 side of the condenser lens 195 toward the projection side optical system 220. Therefore, the condenser lens 195 also includes a part of the projection side optical system 220. Has been.

  In the vicinity of the light tunnel 175, a condenser lens 173 that condenses the light source light at the entrance of the light tunnel 175 is disposed. Therefore, the red wavelength band light, the green wavelength band light, and the blue wavelength band light are collected by the condenser lens 173 and enter the light tunnel 175. The light beam incident on the light tunnel 175 is converted into a light beam having a uniform intensity distribution by the light tunnel 175.

  On the optical axis on the back panel 13 side of the light tunnel 175, an optical axis conversion mirror 181 is disposed via a condenser lens 178. The beam bundle emitted from the exit of the light tunnel 175 is condensed by the condenser lens 178 and then the optical axis is converted to the left panel 15 side by the optical axis conversion mirror 181.

  The light beam reflected by the optical axis conversion mirror 181 is condensed by the condenser lens 183 and then irradiated by the irradiation mirror 185 to the display element 51 through the condenser lens 195 at a predetermined angle. The display element 51 that is a DMD is provided with a heat sink 190 on the back panel 13 side, and the display element 51 is cooled by the heat sink 190.

  The light beam that is the light source light irradiated to the image forming surface of the display element 51 by the light source side optical system 170 is reflected by the image forming surface of the display element 51 and projected onto the screen through the projection side optical system 220 as projection light. Is done. Here, the projection side optical system 220 includes a condenser lens 195, a movable lens group 235, and a fixed lens group 225. The movable lens group 235 is formed to be movable by a lens motor. The movable lens group 235 and the fixed lens group 225 are built in the fixed lens barrel. Therefore, the fixed lens barrel including the movable lens group 235 is a variable focus lens, and is formed so that zoom adjustment and focus adjustment are possible.

  By configuring the projection device 10 in this way, when the fluorescent plate 101 is rotated and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at different timings, light of each wavelength band of red, green, and blue is guided. Since the light is sequentially incident on the condenser lens 173 and the light tunnel 175 via the optical system 140 and further incident on the display element 51 via the light source side optical system 170, the DMD which is the display element 51 of the projection apparatus 10 is used as data. Accordingly, by displaying each color light in a time-sharing manner, a color image can be projected on the screen.

  Next, a spectrum in which the first dichroic mirror 141 transmits blue wavelength band light and reflects red wavelength band light and green wavelength band light will be described with reference to FIGS. 4 and 5. FIG. 4 shows the spectrum of each color wavelength band light. In FIG. 4, light BLD having a wavelength distributed from 440 nm to 450 nm is a spectrum of blue wavelength band light emitted from the excitation light irradiation device 70 serving as the first light source. Similarly, light GFL distributed from a wavelength of 450 nm to 700 nm is a spectrum of green wavelength band light emitted from the fluorescent screen device 100. The light RLED distributed from a wavelength of 580 nm to 660 nm is a spectrum of red wavelength band light emitted from the red light source device 120 serving as the second light source.

  Next, FIG. 5 shows a spectrum when each color wavelength band light is reflected or transmitted by the first dichroic mirror 141. In FIG. 5, BTM indicated by a solid line indicates the transmittance of the first dichroic mirror 141. As shown by the solid line BTM in FIG. 5, almost all light having a wavelength of about 470 nm or less is transmitted by the first dichroic mirror 141. Further, part of the light having a wavelength of about 470 nm or more and about 510 nm or less is transmitted, and the other light is reflected. And almost all of the light having a wavelength longer than about 510 nm is reflected.

  Therefore, the red wavelength band light RLED having a wavelength ranging from 580 nm to 660 nm is all reflected by the first dichroic mirror 141. Here, the same dichroic mirror as the first dichroic mirror 141 is used as the second dichroic mirror 148. Therefore, as shown in FIG. 3, the red wavelength band light RLED reflected by the first dichroic mirror 141 is reflected again by the second dichroic mirror 148, and enters the entrance of the light tunnel 175 via the condenser lens 173. The light is condensed and then irradiated to the display element 51.

  On the other hand, as shown in FIG. 5, the green wavelength band light GFL is partially reflected by the first dichroic mirror 141 having a transmittance of a solid line BTM, but with a wavelength of about 510 nm or less. Will be transmitted.

  Further, as shown in FIG. 5, all of the green wavelength band light GFL having a wavelength of about 510 nm or more is reflected by the first dichroic mirror 141. The green wavelength band light GFL reflected by the first dichroic mirror 141 is also reflected by the second dichroic mirror 148 in the same manner as the red wavelength band light RLED from which light in all wavelength bands is reflected. The light is condensed at the entrance of the tunnel 175 and then irradiated to the display element 51.

  Here, temporarily, as the light source device 60, the red light source device 120 is not disposed opposite to the excitation light irradiation device 70 with respect to the fluorescent plate device 100, and unlike the first dichroic mirror 141, the red wavelength band light RLED. In the case of the conventional configuration using the dichroic mirror that transmits the green wavelength band light GLF, the red wavelength band light RLED and the green wavelength band light are matched to match the red wavelength band light and the green wavelength band light. Light in the wavelength range (wavelength range of 580 nm to 660 nm) where GLFs overlap is reflected or transmitted together.

  For this reason, for example, in a dichroic mirror that transmits the overlapping wavelength range, the red wavelength band light can be used effectively, but the green wavelength band light in the overlapping wavelength range is transmitted and becomes invalid light. However, in the light source device 60 of the present embodiment, by using the first dichroic mirror 141 and the second dichroic mirror 148, the wavelength range overlapping the red wavelength band light RLED in the wavelength range of the green wavelength band light GLF. The green wavelength band light GLF (with a wavelength of 580 nm to 660 nm) can be irradiated to the display element 51 as effective light without being invalid light that is not irradiated to the display element 51.

  In this way, the green wavelength band light GFL and the red wavelength band light RLED, which are adjacent wavelength regions, are irradiated on the display element 51 with the same optical axis including a portion where the wavelength ranges of both lights overlap. The green wavelength band light in the portion where the wavelength ranges of both lights overlap can be used without being made invalid light. In general, the light intensity of red wavelength band light is weak at present compared to other green and blue light. And even if red wavelength band light is emitted using a red phosphor or red LED, the red phosphor has low luminance due to the effect of light emission efficiency and temperature saturation, and in the case of a red LED, it is difficult to synthesize a plurality of In the first place, since the utilization efficiency of light is low, in any case, the luminance tends to be low. Therefore, the luminance of the red wavelength band light can be improved by using the green wavelength band light GFL in the range where the green wavelength band light GFL and the red wavelength band light RLED overlap as effective light as in this embodiment. .

  Still further, of the image light emitted from the display element 51, the white color tone is close to blue or green with high light intensity. However, with this configuration, the brightness of the red wavelength band light is improved by the light in the wavelength range that overlaps the red wavelength band light in the green wavelength band light, so that the white color is corrected closer to red, and an appropriate white color is obtained. Improved as the color of

  Further, when the number of blue laser diodes 71 of the excitation light irradiation device 70 is increased in order to improve the brightness of the projection light emitted from the projection device 10, the fluorescent plate is increased by the increase in the light intensity of the excitation light. The luminance of the fluorescent light of the green wavelength band light emitted from the phosphor layer 101 is also increased. Then, since the luminance of the light in the range where the green wavelength band light and the red wavelength band light overlap is also increased, the luminance of the red wavelength band light is increased without increasing the luminance of the red light source device 120. Therefore, according to the configuration of the present invention, the brightness of the projector 10 is improved while maintaining the white color.

  As described above, the light source device 60 according to the embodiment of the present invention has the excitation light irradiation device 70 as the first light source and the region through which the emitted light from the phosphor layer and the excitation light irradiation device 70 is transmitted or diffused. A fluorescent plate device 100 including the fluorescent plate 101 and a red light source device 120 as a second light source are provided. The red light source device 120 is disposed to face the excitation light irradiation device 70 with the fluorescent plate device 100 interposed therebetween.

  Thereby, since the direction and optical axis of the emitted light from the fluorescent plate device 100 and the emitted light from the red light source device 120 can be matched, a part of the emitted light from the fluorescent plate device 100 is improved in luminance of the red light source device 120. Can be used.

  Further, the first dichroic that transmits the emitted light from the excitation light irradiation device 70 as the first light source and reflects the emitted light from the fluorescent plate device 100 and the emitted light from the red light source device 120 as the second light source. The mirror 141 was disposed between the excitation light irradiation device 70 and the fluorescent screen device 100.

  Thereby, about the emitted light from the fluorescent plate apparatus 100 and the emitted light from the red light source device 120, the light of the wavelength of the range with which the wavelength of both emitted light overlaps can be utilized as effective light, without making it invalid light.

  Further, the light emitted from the excitation light irradiation device 70 as the first light source is transmitted on the optical axis of the light beam reflected by the first dichroic mirror 141, and the light emitted from the fluorescent plate device 100 and the second light are transmitted. A second dichroic mirror 148 that reflects light emitted from the red light source device 120 as a light source is disposed.

  As a result, the second dichroic mirror 148 can be the same dichroic mirror as the first dichroic mirror 141, so that the optical components in the light source device 60 can be shared, and the manufacturing cost can be reduced.

  In addition, between the fluorescent plate device 100 and the red light source device 120 that is the second light source, light emitted from the excitation light irradiation device 70 that is the first light source that is transmitted or diffused and transmitted through the fluorescent plate 101 of the fluorescent plate device 100. And a third dichroic mirror 143 that transmits the light emitted from the red light source device 120 is disposed. A reflection mirror 145 that reflects the light reflected by the third dichroic mirror 143 toward the second dichroic mirror 148 is disposed.

  As a result, the emitted light of the excitation light irradiation device 70, which is the light source for the excitation light of the phosphor layer, is not only used as excitation light, but can be easily converted into light source light of blue wavelength band light by the dichroic mirror and the total reflection mirror. The light can be guided to the same optical axis as other wavelength band light. Since the wavelength band of the blue wavelength band light that is the excitation light and the red wavelength band light from the red light source device 120 that is the second light source are not adjacent to each other, they are separated from each other by the third dichroic mirror 143. Ineffective light does not occur in the wavelength range of the reflected blue wavelength band light.

  The first light source includes a blue laser diode 71 which is a laser diode, and the second light source is a light source device 60 including a red light source 121 which is a red light emitting LED. As a result, the first light source, which is also referred to as the excitation light source, can be configured by a laser diode, and the red light source device 120 can be configured by using a red light emitting LED, and can easily be a high-intensity light source.

  The first light source is an excitation light irradiation device 70 that emits light in the blue wavelength band, the second light source is the red light source device 120 that emits light in the red wavelength band, and a phosphor plate device including the phosphor plate 101 having a phosphor layer. 100 emits light in the green wavelength band. As a result, light of each wavelength band of red, green, and blue can be emitted, and the ineffective light of the green wavelength band light is reduced to improve the light utilization efficiency and improve the luminance of the red wavelength band light. The light source device 60 can be provided.

  The projection apparatus 10 includes a light source device 60, a display element 51, a projection-side optical system 220, and a projection device control unit. Thereby, it is possible to provide the projection device 10 having the light source device 60 that improves the luminance of the red wavelength band light while reducing the ineffective light of the green wavelength band light and improving the light utilization efficiency.

  Further, the embodiment described above is presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

The invention described in the first claim of the present application will be appended below.
[1] a first light source;
A fluorescent plate provided with a phosphor layer that uses the emitted light from the first light source as excitation light, and a region that transmits or diffuses and transmits the emitted light from the first light source;
A second light source disposed opposite to the first light source across the fluorescent plate;
A light source device comprising:
[2] A fluorescent plate apparatus having the fluorescent plate is provided
The fluorescent plate is a fluorescent wheel;
Between the first light source and the fluorescent plate device, the emitted light from the first light source is transmitted, the emitted light from the phosphor layer of the fluorescent plate of the fluorescent plate device, and the fluorescent plate device The light source device according to [1], wherein a first dichroic mirror that reflects light emitted from the second light source that has been transmitted or diffused through the fluorescent plate is disposed.
[3] The light emitted from the first light source is transmitted on the optical axis of the light beam reflected by the first dichroic mirror, and the light emitted from the phosphor layer of the phosphor plate of the phosphor plate device; The light source device according to [2], further comprising a second dichroic mirror that reflects light emitted from the second light source that has been transmitted or diffused through the fluorescent plate of the fluorescent plate device.
[4] Between the fluorescent plate device and the second light source, light emitted from the first light source that is transmitted or diffused and transmitted through the fluorescent plate of the fluorescent plate device is reflected, and the light from the second light source is reflected. A third dichroic mirror that transmits outgoing light is disposed, and a reflection mirror that reflects the light beam reflected by the third dichroic mirror toward the second dichroic mirror is provided. 3].
[5] The light source device according to any one of [1] to [4], wherein the first light source includes a laser diode, and the second light source includes an LED.
[6] The first light source is a light source that emits blue wavelength band light,
The second light source is a light source that emits red wavelength band light,
The light source device according to any one of [1] to [5], wherein the phosphor layer includes a phosphor emitting green wavelength band light.
[7] The light source device according to any one of [1] to [6],
A display element that is irradiated with light source light from the light source device to form image light;
A projection-side optical system that projects the image light emitted from the display element onto a screen;
A projection device control means for controlling the display element and the light source device;
A projection apparatus comprising:

DESCRIPTION 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 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir reception unit 36 Ir processing unit 37 Key / indicator unit 38 Control unit 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 51 Display Element 60 Light source device 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 75 Reflective mirror group 76 Mirror substrate 78 Condensing lens 80 Green light source device 81 Heat sink 100 Fluorescent plate device 101 Fluorescent plate 107 Condensing lens group 110 Motor 115 Condensing lens 120 Red light source device 121 Red light source 125 Condensing lens group 130 Heat sink 140 Light guiding optical system 141 First dichroic mirror 143 Third dichroic mirror 145 Reflecting mirror 146 Condensing lens 147 Condensing lens 1 8 Second dichroic mirror 149 Condensing lens 170 Light source side optical system 173 Condensing lens 175 Light tunnel 178 Condensing lens 181 Optical axis conversion mirror 183 Condensing lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 220 Projection side optical system 225 Fixed Lens group 235 Movable lens group 241 Control circuit board 261 Cooling fan

Claims (7)

  1. A first light source;
    A fluorescent plate provided with a phosphor layer that uses the emitted light from the first light source as excitation light, and a region that transmits or diffuses and transmits the emitted light from the first light source;
    A second light source disposed opposite to the first light source across the fluorescent plate;
    A light source device comprising:
  2. Comprising a fluorescent screen device having the fluorescent screen,
    The fluorescent plate is a fluorescent wheel;
    Between the first light source and the fluorescent plate device, the emitted light from the first light source is transmitted, the emitted light from the phosphor layer of the fluorescent plate of the fluorescent plate device, and the fluorescent plate device 2. The light source device according to claim 1, wherein a first dichroic mirror that reflects light emitted from the second light source that is transmitted or diffused and transmitted through a fluorescent plate is disposed.
  3.   The emitted light from the first light source is transmitted on the optical axis of the light beam reflected by the first dichroic mirror, and the emitted light from the phosphor layer of the fluorescent plate of the fluorescent plate device, and the fluorescent plate The light source device according to claim 2, wherein a second dichroic mirror that reflects light emitted from the second light source that is transmitted or diffused and transmitted through the fluorescent plate of the device is disposed.
  4.   Between the fluorescent plate device and the second light source, the light emitted from the first light source that has been transmitted or diffused through the fluorescent plate of the fluorescent plate device is reflected, and the light emitted from the second light source is reflected. The third dichroic mirror to be transmitted is disposed, and further includes a reflection mirror that reflects the light beam reflected by the third dichroic mirror toward the second dichroic mirror. Light source device.
  5.   5. The light source device according to claim 1, wherein the first light source includes a laser diode, and the second light source includes an LED.
  6. The first light source is a light source emitting blue wavelength band light;
    The second light source is a light source that emits red wavelength band light,
    The light source device according to claim 1, wherein the phosphor layer includes a phosphor that emits light in a green wavelength band.
  7. A light source device according to any one of claims 1 to 6;
    A display element that is irradiated with light source light from the light source device to form image light;
    A projection-side optical system that projects the image light emitted from the display element onto a screen;
    A projection device control means for controlling the display element and the light source device;
    A projection apparatus comprising:
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