JP6669192B2 - Light source device and projection device - Google Patents

Light source device and projection device Download PDF

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JP6669192B2
JP6669192B2 JP2018082843A JP2018082843A JP6669192B2 JP 6669192 B2 JP6669192 B2 JP 6669192B2 JP 2018082843 A JP2018082843 A JP 2018082843A JP 2018082843 A JP2018082843 A JP 2018082843A JP 6669192 B2 JP6669192 B2 JP 6669192B2
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light
light source
fluorescent plate
dichroic mirror
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JP2018128695A (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, a data projector as an image projection device that projects a screen of a personal computer, a video image, and an image based on image data stored in a memory card or the like onto a screen is frequently used. In this projector, light emitted from a light source is condensed on a micromirror display element called a DMD (digital micromirror device) or a liquid crystal plate to display a color image on a screen.

  The use of projectors, which are projection devices, has been expanding from business presentations to home use with the spread of video equipment such as personal computers and DVD players. Conventionally, such projectors mainly use a high-intensity discharge lamp as a light source, but in recent years, a projector using a semiconductor light-emitting element such as a light-emitting diode or a laser diode as a light source, or being irradiated with excitation light. Accordingly, various projection devices including a fluorescent plate device such as a fluorescent wheel having a phosphor layer that emits fluorescent light have been developed.

  Patent Literature 1 discloses a semiconductor laser that emits blue laser light, an LED that emits red light, a phosphor that emits green light using the laser light of the semiconductor laser as excitation light, and a color that has a diffusion unit that diffuses blue laser light. A data projector device as a projection device including wheels 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 light is applied to the mirror element.

  As described above, 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 coincide with each other. And combine them.

JP-A-2011-70127

  Here, by using a dichroic mirror to transmit two lights whose wavelength bands overlap each other, one of the lights is transmitted and the other light is reflected. May become invalid light. In the projection device disclosed in Patent Literature 1, in a dichroic mirror that transmits blue light and red light and reflects green light, light in a region of the green light that overlaps with red light in the wavelength region of green light is reflected by the dichroic mirror. Is transmitted, so that it becomes invalid light without being used for image formation. Therefore, the efficiency of using green light is poor.

  Therefore, an object of the present invention is to provide a light source device and a projection device in which ineffective light not used for image formation is reduced and light source light use efficiency is improved.

A light source device of the present invention includes a first semiconductor light-emitting element, a phosphor layer having excitation light emitted from the first semiconductor light-emitting element, and a fluorescent plate provided with a region that transmits or diffuses light. A second semiconductor light-emitting element disposed opposite to the first semiconductor light-emitting element with the fluorescent plate interposed therebetween, and a second semiconductor light-emitting element disposed between the first semiconductor light-emitting element and the fluorescent plate; The light emitted from the light emitting element is transmitted, the light emitted from the phosphor layer of the fluorescent plate, and the light emitted from the second semiconductor light emitting element transmitted or diffused and transmitted through the transparent or diffusely transmitted region of the fluorescent plate. A first dichroic mirror that reflects emitted light, and is disposed on an optical axis of a light beam reflected by the first dichroic mirror, transmits light emitted from the first semiconductor light emitting element, and transmits the light emitted from the first semiconductor light emitting element. fluorescence Characterized in that it has light emitted from the layer, and a second dichroic mirror for reflecting the light emitted from the transmission or diffuse said transmitted to the area is transmitted or diffused transmissive second semiconductor light emitting element of the fluorescent plate And
Another light source device of the present invention includes a fluorescent wheel provided with a first light source, a phosphor layer that uses light emitted from the first light source as excitation light, and a region that transmits or diffuses and transmits light. A fluorescent plate device, a second light source disposed opposite to the first light source with the fluorescent wheel interposed therebetween, and a second light source disposed between the first light source and the fluorescent plate device; And reflects the emitted light from the phosphor layer of the fluorescent wheel of the fluorescent plate device and the emitted light from the second light source transmitted or diffused and transmitted through the fluorescent wheel of the fluorescent plate device. A first dichroic mirror, and a light beam reflected by the first dichroic mirror, which is disposed on an optical axis of the light beam, transmits light emitted from the first light source, and emits light from the fluorescent wheel of the fluorescent plate device. Emission from body layer And a second dichroic mirror that reflects light emitted from the second light source that is transmitted or diffusely transmitted through the fluorescent wheel of the fluorescent plate device, and is disposed between the fluorescent plate device and the second light source. A third dichroic mirror that reflects light emitted from the first light source transmitted or diffused and transmitted through the fluorescent wheel of the fluorescent plate device, and transmits light emitted from the second light source; And a reflecting mirror that reflects the light beam reflected by the dichroic mirror toward the second dichroic mirror.

  A projection device of the present invention includes the above-described light source device, a display element that is irradiated with light source light from the light source device and forms image light, and a projection side that projects the image light emitted from the display element onto a screen. An optical system, the display element, and a projection device control unit that controls the light source device are provided.

  According to the present invention, it is possible to reduce light emitted from a light source which is not used for image formation and is regarded as invalid light, so that it is possible to improve the light source light use efficiency.

1 is an external perspective view illustrating a projection device according to an embodiment of the present invention. FIG. 2 is a diagram illustrating functional blocks of the projection device according to the embodiment of the present invention. FIG. 2 is a schematic plan view showing the internal structure of the projection device according to the embodiment of the present invention. FIG. 4 is a diagram illustrating a wavelength distribution and light intensity of each color wavelength band light of the projection device according to the embodiment of the present invention. FIG. 3 is a diagram illustrating a transmittance of a first dichroic mirror, a wavelength distribution and light intensity of each color wavelength band light transmitted or reflected by the first dichroic mirror in the projection device according to the embodiment of the present invention.

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

  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 opening on the side of the front panel 12 that is a front side plate of the housing of the projection device 10. In addition, the front panel 12 has a plurality of exhaust holes 17. Further, although not shown, an Ir receiving unit for receiving a control signal from a remote controller is provided.

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

  Further, on the rear surface of the housing, an input / output connector unit for providing a USB terminal and a D-SUB terminal for video signal input for inputting an analog RGB video signal on the rear panel, an S terminal, an RCA terminal, an audio output terminal, and the like, Various terminals (group) 20 such as a power adapter plug are provided. Further, a plurality of intake holes are formed in the back panel. A plurality of exhaust holes 17 are formed on the right panel, which is a side plate of a housing (not shown), and on the left panel 15 and the front panel 12 which are side plates shown in FIG. An intake hole 18 is also formed in a corner of the left panel 15 near the rear panel or in 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 device 10 and includes a CPU, a ROM in which operation programs such as various settings are fixedly stored, a RAM used as a work memory, and the like. ing.

  The image signal of various standards input from the input / output connector unit 21 by the projection device control means is transmitted to the image conversion unit 23 via the input / output interface 22 and the system bus (SB) in a predetermined format suitable for display. After being converted so as to be unified into the image signal of

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

  The display drive unit 26 functions as a display element control unit, and drives the display element 51, which 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 described later, a light image is formed by reflected light of the display element 51, and the projection-side optical system is formed. The image is projected and displayed on a screen (not shown) through the display. The movable lens group 235 of the projection-side optical system is driven by a lens motor 45 for zoom adjustment and focus adjustment.

  The image compression / decompression unit 31 performs a recording process of compressing the luminance signal and the color difference signal of the image signal by a process such as ADCT and Huffman coding, and sequentially writing the data into a memory card 32 which is a removable recording medium. .

  Further, the image compression / decompression unit 31 reads out the image data recorded on the memory card 32 in the reproduction mode, decompresses individual image data constituting a series of moving images in units of one frame, and converts this image data into image conversion. The image data is output to the display encoder 24 via the unit 23, and processing for enabling display of a moving image or the like is performed based on the image data stored in the memory card 32.

  An operation signal of a key / indicator unit 37 composed of a main key, an indicator, and the like 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 an analog signal in the projection mode and the reproduction mode, and drives the speaker 48 to emit loudspeakers.

  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 controls the light source device 60 so that light of a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. In addition, individual control is performed to cause the light source device 60 to emit red, green, and blue wavelength band light.

  Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection by 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 result of the temperature detection. Further, the control unit 38 causes the cooling fan drive control circuit 43 to continue the rotation of the cooling fan even after the power of the main body of the projection device 10 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 device 10 will be described with reference to FIG. FIG. 3 is a schematic plan view showing the internal structure of the projection device 10. The projection device 10 includes a control circuit board 241 near the right panel 14. The control circuit board 241 includes a power supply circuit block, a light source control block, and the like. Further, the projection device 10 includes the light source device 60 on the side of the control circuit board 241, that is, substantially in the center of the housing of the projection device 10. Further, in the projection device 10, a light source side optical system 170 and a projection side optical system 220 are arranged between the light source device 60 and the left panel 15.

  The light source device 60 is a light source for blue wavelength band light as a first light source, which is an excitation light irradiation device 70 also serving as an excitation light source, and a red light source being a light source for red wavelength band light as a second light source. The device includes a device 120 and a green light source device 80 serving as a light source for green wavelength band light. 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 guide 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 irradiating device 70 as the first light source is disposed near the back panel 13 at a substantially central portion in the left-right direction of the casing of the projection device 10. The excitation light irradiating device 70 includes a light source group including a plurality of blue laser diodes 71, which are a plurality of semiconductor light emitting elements, arranged so that the optical axis is parallel to the back panel 13, and the light emitted from each blue laser diode 71. A reflecting mirror group 75 for converting the axis by 90 degrees in the direction of the front panel 12, a condensing lens 78 for condensing light emitted from each blue laser diode 71 reflected by the reflecting mirror group 75, and a blue laser diode 71 and a right panel And a heat sink 81 disposed between the heat sink and the heat sink.

  The light source group includes a plurality of blue laser diodes 71 arranged in a matrix. Also, on the optical axis of each blue laser diode 71, a collimator lens 73 that converts each light into parallel light so as to enhance the directivity of each light emitted from each blue laser diode 71 is arranged. The reflection mirror group 75 is formed by aligning a plurality of reflection mirrors in a stepwise manner and integrated with the mirror substrate 76 to perform position adjustment, and reduces the cross-sectional area of the light beam emitted from the blue laser diode 71 to one. Then, the light is emitted to the condenser lens 78.

  A cooling fan 261 is arranged 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 arranged between the reflection mirror group 75 and the rear 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 near the front panel 12. The fluorescent plate device 100 rotates a fluorescent plate 101 such as a fluorescent wheel, which is disposed parallel to the front panel 12, that is, perpendicular to the optical axis of the light emitted from the excitation light irradiation device 70. A motor 110 to be driven and a condenser lens group 107 for condensing the light beam of the excitation light emitted from the excitation light irradiation device 70 on the fluorescent screen 101 and condensing the light beam emitted from the fluorescent screen 101 toward the back panel 13 And a condenser lens 115 for condensing a light beam emitted from the fluorescent plate 101 in the direction of the front panel 12. Note that a cooling fan 261 is arranged between the motor 110 and the front panel 12, and the cooling fan 261 cools the fluorescent screen device 100 and the like.

  The fluorescent plate 101 receives a light emitted from the excitation light irradiation device 70 via the condenser lens group 107 as excitation light and emits a 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 the excitation light that is the light emitted from 70 is provided continuously in the circumferential direction.

  The base of the fluorescent plate 101 is a metal base made of copper, aluminum, or the like, and an annular groove is formed on the surface of the base on the side of the excitation light irradiation device 70, and the bottom of the groove is formed by silver deposition or the like. Mirror processing is performed, and a green phosphor layer is laid on the mirror processed surface. Further, in the case where the excitation light is transmitted or diffused and transmitted, the transparent substrate having a light-transmitting property is fitted into the cutout through hole of the substrate. When the region is to be diffused and transmitted, a transparent substrate having fine irregularities formed on the surface by sandblasting or the like is fitted.

  When a blue wavelength band light as excitation light from an excitation light irradiating device 70 serving as a first light source is applied to the green phosphor layer of the phosphor plate 101, the phosphor layer of the phosphor plate 101 emits green light. The phosphor is excited, and emits green wavelength band light in all directions from the green phosphor. The light beam emitted by the fluorescent light 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 transmission or diffusion transmission region of the fluorescent screen 101 is transmitted or diffusely transmitted through the fluorescent screen 101, and is on the rear side of the fluorescent screen 101 (in other words, on the front panel 12). (Side). Further, red wavelength band light from the red light source device 120, which is the second light source, which is incident on a region of the fluorescent plate 101 that transmits or diffuses light is transmitted or diffusely transmitted through the fluorescent plate 101, and the front side of the fluorescent plate 101 (in other words, For example, the light enters the condenser lens group 107 disposed on the rear panel 13).

  The red light source device 120 as the second light source is disposed to face the excitation light irradiation device 70 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 arranged so that the optical axis is orthogonal to the blue laser diode 71, and a condenser lens group 125 that collects 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. The red light source device 120 is configured such that the optical axis of the red wavelength band light emitted from the red light source device 120 is the optical axis of the blue wavelength band light emitted from the excitation light irradiation device 70 and the optical axis of the green wavelength band light emitted from the fluorescent plate 101. Are arranged so as to be the same as. Further, 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 arranged on the right side 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-guiding optical system 140 includes a condensing lens that collects light beams in red, green, and blue wavelength bands, and a reflection mirror that converts the optical axis of the light beam in each color wavelength band to the same optical axis. It consists of a dichroic mirror and the like. Specifically, the light guide optical system 140 transmits blue wavelength band light, which is light 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 emitted from the fluorescent plate device 100 and the red wavelength band emitted from the red light source device 120 as a second light source transmitted or diffused through the fluorescent plate 101 of the fluorescent plate device 100. A first dichroic mirror 141 that reflects light is provided. 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.

  On the left panel 15 side of the first dichroic mirror 141, a condenser lens 149 is arranged. Further, a second dichroic mirror 148 is arranged on the left panel 15 side of the condenser lens 149, on the optical axis of the light beam reflected by the first dichroic mirror 141. Like the first dichroic mirror 141, the second dichroic mirror 148 transmits the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band emitted light from the phosphor plate device 100. It reflects light and red wavelength band light that is emitted light from the red light source device 120 as the second light source that has been transmitted or diffusely transmitted through the fluorescent plate 101 of the fluorescent plate device 100. The reflection of the green wavelength band light and the red wavelength band light by the second dichroic mirror 148 is performed such that the optical axis is converted by 90 degrees toward the rear panel 13.

  Also, on the optical axis of the blue wavelength band light transmitted or diffusely transmitted through the fluorescent plate 101 and the red wavelength band light emitted from the red light source device 120, that is, the red light source device serving as the fluorescent plate device 100 and the second light source. A third dichroic mirror 143 is disposed between the second dichroic mirror 120 and the second dichroic mirror 143. The third dichroic mirror 143 reflects the blue wavelength band light, which is the light emitted from the excitation light irradiation device 70 as the first light source transmitted or diffused and transmitted through the fluorescent plate 101 of the fluorescent plate device 100, and The red wavelength band light which is the light emitted 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.

  On the left panel 15 side of the third dichroic mirror 143, a condenser lens 146 is arranged. On the left panel 15 side of the condenser lens 146, a reflection mirror 145 is arranged. On the rear panel 13 side of the reflection mirror 145, a condenser lens 147 is arranged.

  With the light guiding optical system 140 configured as described above, the red, green, and blue wavelength bands of light are 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 irradiating device 70 as the first light source passes through the first dichroic mirror 141, and passes through the condensing lens group 107 and the fluorescent plate 101 in the area where the light is transmitted or diffused. The light is reflected by the third dichroic mirror 143 via the optical lens 115. Then, this blue wavelength band light is reflected by the reflection mirror 145 via the condenser lens 146, passes through the second dichroic mirror 148 via the condenser lens 147, and enters the condenser lens 173.

  The green wavelength band light, which is the light emitted from the fluorescent plate device 100, is reflected by the first dichroic mirror 141 and is reflected by the second dichroic mirror 148 via the condenser lens 149 to the condenser lens 173. Incident. The red wavelength band light, which is the light emitted from the red light source device 120 as the second light source, passes through the condenser lens 115, the area where the fluorescent screen 101 transmits or diffuses the light, and the condenser lens group 107, and becomes the first dichroic. The light is reflected by the mirror 141, is reflected by the second dichroic mirror 148 via the condenser lens 149, and is incident on 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. Note that the condenser lens 195 emits 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, so that the condenser lens 195 may be part of the projection-side optical system 220. Have been.

  In the vicinity of the light tunnel 175, a condenser lens 173 that collects light from the light source at the entrance of the light tunnel 175 is arranged. Therefore, the red wavelength band light, the green wavelength band light, and the blue wavelength band light are condensed 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.

  An optical axis conversion mirror 181 is arranged on the optical axis on the rear panel 13 side of the light tunnel 175 via a condenser lens 178. The light beam emitted from the light exit of the light tunnel 175 is condensed by the condenser lens 178, and the optical axis is converted by the optical axis conversion mirror 181 to the left panel 15 side.

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

  The light beam which is the light source light emitted to the image forming surface of the display element 51 by the light source side optical system 170 is reflected on the image forming surface of the display element 51 and is projected as projection light on the screen via the projection side optical system 220. 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 so as to be movable by a lens motor. The movable lens group 235 and the fixed lens group 225 are built in a 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 manner, when the fluorescent plate 101 is rotated and light is emitted from the excitation light irradiating device 70 and the red light source device 120 at different timings, the red, green, and blue wavelength band light 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 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. By displaying the light of each color 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 the blue wavelength band light and reflects the red wavelength band light and the green wavelength band light will be described with reference to FIGS. FIG. 4 shows the spectrum of each color wavelength band light. In FIG. 4, the light BLD whose wavelength is distributed from 440 nm to 450 nm is a spectrum of the 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 phosphor plate device 100. The light RLED having a wavelength ranging from 580 nm to 660 nm is a spectrum of red wavelength band light emitted from the red light source device 120 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, light having a wavelength of about 470 nm or more and about 510 nm or less transmits some light and reflects other light. Then, almost all light having a wavelength longer than about 510 nm is reflected.

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

  On the other hand, the green wavelength band light GFL is partially reflected by the first dichroic mirror 141 having the transmittance of the solid line BTM as shown in FIG. Will be transmitted.

  Further, as shown in FIG. 5, all the light 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, which reflects light in all wavelength bands, and The light is condensed at the entrance of the tunnel 175, and then irradiates the display element 51.

  Here, as the light source device 60, unlike the first dichroic mirror 141, the red light source device 120 is different from the red dichroic mirror 141 without disposing the red light source device 120 with respect to the fluorescent plate device 100 so as to face the excitation light irradiation device 70. In a conventional configuration using a dichroic mirror that transmits light and reflects green wavelength band light GLF, the red wavelength band light RLED and the green wavelength band light are used to match the red wavelength band light and the green wavelength band light. Light in the wavelength range where the GLF overlaps (wavelength range from 580 nm to 660 nm) is both reflected or transmitted together.

  For this reason, for example, a dichroic mirror that transmits overlapping wavelength ranges can effectively use red wavelength band light, but transmits green wavelength band light in the overlapping wavelength range 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 of the green wavelength band light GLF that overlaps with the red wavelength band light RLED is used. The green wavelength band light GLF (with a wavelength in the range of 580 nm to 660 nm) can be radiated to the display element 51 as effective light without being invalid light that is not radiated to the display element 51.

  As described above, the green wavelength band light GFL and the red wavelength band light RLED, which are adjacent wavelength regions, are irradiated to 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 at the portion where the wavelength ranges of the two lights overlap can be used without invalid light. In general, the light intensity of the red wavelength band light is weaker than other green and blue lights at present. And even if red light or red LED is used to emit red wavelength band light, the red phosphor has low luminance due to the effect of luminous efficiency and temperature saturation, and in the case of red LED, it is difficult to synthesize a plurality of red LEDs, Since the light use efficiency is low in the first place, the luminance tends to be low in any case. Therefore, as in the present embodiment, 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. .

  Further, of the image light emitted from the display element 51, the white tint is closer to blue or green, where the light intensity is strong. However, according to this configuration, the brightness of the red wavelength band light is improved by the light in the wavelength range overlapping with the red wavelength band light in the green wavelength band light, so that the white tint is corrected to be closer to red, and an appropriate white color is corrected. The color is improved.

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

  As described above, the light source device 60 according to the embodiment of the present invention includes the excitation light irradiation device 70 as the first light source, and the region through which the light emitted from the phosphor layer and the excitation light irradiation device 70 is transmitted or diffused. A fluorescent plate device 100 having a 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, the direction and optical axis of the light emitted from the fluorescent plate device 100 and the light emitted from the red light source device 120 can be matched, so that a part of the light emitted from the fluorescent plate device 100 can be improved in brightness of the red light source device 120. Can be used for

  In addition, a first dichroic that transmits light emitted from the excitation light irradiation device 70 as the first light source and reflects light emitted from the fluorescent plate device 100 and light emitted 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 plate device 100.

  Thus, the light emitted from the fluorescent plate device 100 and the light emitted from the red light source device 120 can be used as effective light without invalid light having a wavelength in a range in which the wavelengths of both the emitted lights overlap.

  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 emitted. A second dichroic mirror 148 that reflects light emitted from the red light source device 120 as a light source is disposed.

  Accordingly, 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 cost for manufacturing can be reduced.

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

  Thus, the emission light of the excitation light irradiating device 70, which is the light source of the excitation light of the phosphor layer, is not only used as the excitation light, but also easily converted into the light source light of the blue wavelength band light by the dichroic mirror and the total reflection mirror. , Can be used by being guided to the same optical axis as other wavelength band light. Since the wavelength bands of the blue wavelength band light as the excitation light and the red wavelength band light from the red light source device 120 as the second light source are not adjacent but separated, the third dichroic mirror 143 Invalid 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 as a laser diode, and the second light source is a light source device 60 including a red light source 121 that is a red light emitting LED. Thus, the first light source, which is also the excitation light source, can be constituted by a laser diode, and the red light source device 120 is constituted by using a red light emitting LED, so that a high-brightness light source can be easily obtained.

  The first light source is an excitation light irradiation device 70 that emits blue wavelength band light, the second light source is a red light source device 120 that emits red wavelength band light, and a fluorescent plate device including a fluorescent plate 101 having a phosphor layer. 100 emits green wavelength band light. As a result, red, green, and blue wavelength light in each color band are formed so as to be able to be emitted. The luminance of the red wavelength band light is improved while reducing the ineffective light of the green wavelength band light and improving the light use efficiency. A light source device 60 can be provided.

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

  In addition, the embodiments described above are presented as examples, and are not intended to limit the scope of the invention. These new embodiments can be implemented in other various forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and their equivalents.

Hereinafter, the invention described in the first claim of the present application will be additionally described.
[1] a first light source;
A phosphor layer provided with a phosphor layer that uses emission light from the first light source as excitation light, and a region that transmits or diffuses and transmits the emission light from the first light source;
A second light source disposed opposite to the first light source with the fluorescent plate interposed therebetween;
A light source device comprising:
[2] 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, light emitted from the first light source is transmitted, and light emitted 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 and transmitted 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 is emitted from the phosphor layer of the phosphor plate of the phosphor plate device. The light source device according to [2], further including 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 fluorescent plate device.
[4] Between the fluorescent plate device and the second light source, the light emitted from the first light source 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 for transmitting the emitted light is provided, and a reflection mirror for reflecting the light beam reflected by the third dichroic mirror toward the second dichroic mirror is provided. The light source device according to [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 that emits 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 and forms image light,
A projection-side optical system that projects the image light emitted from the display element onto a screen,
The display element, a projection device control means for controlling the light source device,
A projection device comprising:

DESCRIPTION OF SYMBOLS 10 Projection apparatus 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 unit 22 Input / output interface 23 Image conversion unit 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 Reflection 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 semiconductor light emitting element;
    A phosphor layer provided with a phosphor layer that uses light emitted from the first semiconductor light emitting element as excitation light, and a region that transmits or diffuses light,
    A second semiconductor light-emitting element disposed opposite to the first semiconductor light-emitting element with the fluorescent plate interposed therebetween;
    The first semiconductor light emitting device is disposed between the first semiconductor light emitting device and the fluorescent plate, transmits light emitted from the first semiconductor light emitting device, emits light from the phosphor layer of the fluorescent plate, and the fluorescent plate. A first dichroic mirror that reflects light emitted from the second semiconductor light emitting element that has been transmitted or diffusely transmitted through a region that transmits or diffuses light;
    The light emitted from the first semiconductor light emitting element is disposed on the optical axis of the light beam reflected by the first dichroic mirror, transmits the light emitted from the first semiconductor light emitting element, and is emitted from the phosphor layer of the phosphor plate, and A second dichroic mirror that reflects light emitted from the second semiconductor light emitting element that has been transmitted or diffusely transmitted through the transmission or diffusion transmission region of the fluorescent plate;
    A light source device comprising:
  2. A fluorescent plate device having the fluorescent plate,
    The fluorescent plate is a light source apparatus according to claim 1, wherein the Ru Oh a fluorescent wheel.
  3. Between the fluorescent plate device and the second semiconductor light-emitting element, light emitted from the first semiconductor light-emitting element transmitted or diffused and transmitted through the fluorescent plate of the fluorescent plate device is reflected, and the second semiconductor light-emitting device A third dichroic mirror that transmits light emitted from the element is disposed, and a reflection mirror that reflects a light beam reflected by the third dichroic mirror toward the second dichroic mirror is provided. The light source device according to claim 2 .
  4. It said first semiconductor light emitting element includes a laser diode, the second semiconductor light emitting element, a light source device according to any one of claims 1 to 3 including the LED.
  5. The first semiconductor light emitting device is a semiconductor light emitting device that emits blue wavelength band light,
    The second semiconductor light emitting device is a semiconductor light emitting device that emits red wavelength band light,
    The phosphor layer, the light source device according to any one of claims 1 to 4, characterized in that it has a phosphor emitting green wavelength band light.
  6. A first light source;
    A phosphor plate device having a phosphor wheel provided with a phosphor layer that emits light from the first light source as excitation light, and a region that transmits or diffuses light,
    A second light source disposed opposite to the first light source with the fluorescent wheel interposed therebetween;
    The light emitting device is disposed between the first light source and the fluorescent plate device, transmits light emitted from the first light source, emits light from the phosphor layer of the fluorescent wheel of the fluorescent plate device, and the fluorescent plate device A first dichroic mirror that reflects light emitted from the second light source that has been transmitted or diffusely transmitted through the fluorescent wheel;
    The first light source is disposed on the optical axis of the light beam reflected by the first dichroic mirror, transmits the light emitted from the first light source, emits light from the phosphor layer of the phosphor wheel of the phosphor plate device, and A second dichroic mirror that reflects light emitted from the second light source transmitted or diffusely transmitted through the fluorescent wheel of the fluorescent plate device;
    The light emitted from the first light source, which is disposed between the fluorescent plate device and the second light source and which is transmitted or diffusely transmitted through the fluorescent wheel of the fluorescent plate device, reflects the light emitted from the second light source. A third dichroic mirror for transmitting emitted light,
    A reflecting mirror for reflecting the light beam reflected by the third dichroic mirror toward a second dichroic mirror;
    A light source device comprising:
  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 and forms image light,
    A projection-side optical system that projects the image light emitted from the display element onto a screen,
    The display element, a projection device control means for controlling the light source device,
    A projection device comprising:
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