JP6425058B2 - Light source device and projection device - Google Patents

Description

  The present invention relates to a light source device including a fluorescent plate on which excitation light from an excitation light source is irradiated, and a projection device including the light source device.

  Today, data projectors are widely used as image projectors for projecting on a screen the screen of a personal computer, a video image, and further, an image or the like by image data stored in a memory card or the like. The projector condenses light emitted from a light source on a micro mirror display element called a DMD (digital micro mirror device) or a liquid crystal plate, and displays a color image on a screen.

  With the spread of video devices such as personal computers and DVD players, the projector, which is this projection apparatus, has expanded its application from business presentation to home use. In such projectors, conventionally, the main source is a discharge lamp with high luminance as a light source, but in recent years, semiconductor light emitting elements such as a plurality of laser diodes are used as light sources and this semiconductor light emitting element is used as an excitation light source. Various projection apparatuses provided with fluorescent plates have been developed.

  Patent Document 1 discloses a phosphor plate device having a phosphor plate provided with two types of phosphor layers for emitting green wavelength band light having different hues, and excitation for emitting blue wavelength band light which is a blue light source and is also an excitation light source. A projector is disclosed that has a light source device and a red light source device that emits red wavelength band light. The projector control means of this projector comprises a first projection mode using one of the two phosphor layers provided on the phosphor plate and a second projection mode using the other phosphor layer. It is formed to be projectable by two types of projection modes.

JP, 2011-28228, A

  Thus, the projector of Patent Document 1 is provided with two types of projection modes. And, in recent years, a projection apparatus having a large number of projection modes has been developed in order to improve the image quality, to cope with energy saving, or to perform projection with the optimum luminance according to the projection location. Among the projection lights in such a large number of projection modes, the brightness adjustment of the fluorescence light emitted from the fluorescent plate device is performed by adjusting the drive current of the excitation light source and adjusting the emission light amount of the excitation light.

Here, the excitation light source is constituted by a semiconductor light emitting element, and the excitation light from such an excitation light source is irradiated to the phosphor layer of the fluorescent plate device. Therefore, the burn-in of the phosphor layer due to the irradiation of the excitation light is prevented, and the temperature of the phosphor is raised by the irradiation of the excitation light to prevent temperature quenching in which the light emission efficiency of the phosphor is reduced. May be irradiated to the phosphor layer through a fixed diffusion plate. In response to a number of projection mode described above is adjusted drive current of the excitation light source, the projection device emitting light amount of the excitation light is adjusted, the expansion tides of the fixed diffuser excitation light is brightest ( That is, it is set according to the projection mode (the largest amount of emitted light). However, when the excitation light is in a dark (that is, small amount of emitted light) projection mode, the dark excitation light is transmitted to the fixed diffusion plate corresponding to the brightest excitation light. since expansion plastid is too large Te, the excitation light more than necessary would be spread, utilization efficiency of the excitation light is lowered.

Therefore, in the present invention, in the case where the brightness of the excitation light corresponding to the number of the projection mode is also adjusted, without decreasing the utilization efficiency of the excitation light and diffusely transmitted excitation light at the appropriate expansion tide It is an object of the present invention to provide a light source device that can be used and a projection device provided with the light source device.

The light source device of the present invention comprises an excitation light source, a phosphor plate provided with a phosphor layer to which the excitation light of the excitation light source is irradiated, a diffusion plate provided with a plurality of diffusion regions having different diffusivity, and the diffusion plate And a diffusion plate control unit for switching the diffusion region, wherein the diffusion plate is provided on an incident light path where the excitation light is incident on the fluorescent plate, and the excitation light source is responsive to a drive current. The apparatus may have a plurality of excitation light emission modes in which emission light amounts of the excitation light are different, and the diffusion plate control unit switches the diffusion plate region according to a drive current of the excitation light source .
In the light source device of the present invention, an excitation light source, a phosphor plate provided with a phosphor layer to which the excitation light of the excitation light source is irradiated, a diffusion plate provided with a plurality of diffusion regions having different diffusivity, and the diffusion A diffusion plate control unit for driving the plate and switching the diffusion region, the diffusion plate being provided in an incident light path in which the excitation light is incident on the fluorescent plate, and the emitted light from the fluorescent plate It is characterized in that it is provided on the optical path of the fluorescent light.
In the light source device of the present invention, an excitation light source, a phosphor layer to which the excitation light of the excitation light source is irradiated, and a fluorescent plate provided with a region for transmitting or diffusing and transmitting the excitation light from the excitation light source And a diffusion plate control unit that drives the diffusion plate to switch the diffusion region, and is provided with a plurality of diffusion regions having different diffusion degrees. Is further provided, the diffusion plate is provided on an incident light path where the excitation light is incident on the fluorescent plate, and the other diffusion plate is an optical path on which the excitation light is transmitted or diffused and transmitted through the fluorescent plate Are provided.

  The projection apparatus according to the present invention includes: the excitation light source formed of a semiconductor light emitting element that emits blue wavelength band light; the fluorescent plate that is capable of emitting fluorescent light of green wavelength band light; and the diffusion plate The light source device described above, further comprising: a red light source device formed of a semiconductor light emitting element that emits red wavelength band light; and guiding each color wavelength band light to emit each color wavelength band light. A display element that emits light from the light source device and forms image light; and projection-side optics that projects the image light emitted from the display element onto a screen It has a system, the above-mentioned display element, and projection device control means which controls the above-mentioned light source device.

According to the present invention, the brightness of the excitation light by various projection mode, i.e. even when the amount of light emitted is adjusted without lowering the utilization efficiency of the excitation light, the excitation light by the diffusion plate of suitable expanding tide It can be diffused and transmitted.

It is an appearance perspective view showing a projection device concerning an embodiment of the present invention. It is a figure showing a functional block of a projection device concerning an embodiment of the present invention. It is a plane schematic diagram showing the internal structure of the projection device concerning the embodiment of the present invention. It is a plane schematic diagram of the diffusion plate concerning the embodiment of the present invention. It is a plane schematic diagram which shows arrangement | positioning of the light source device which concerns on other embodiment of this invention. It is a plane schematic diagram which shows arrangement | positioning of the light source device which concerns on other embodiment of this invention.

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

  Then, as shown in FIG. 1, the projection device 10 has a lens cover 19 which covers the projection opening on the side of the front panel 12 which is a substantially rectangular parallelepiped shape and which is a front side plate of the casing of the projection device 10. In addition, the front panel 12 is provided with a plurality of exhaust holes 17. Furthermore, although not shown, an Ir receiver for receiving a control signal from a remote controller is provided.

  In addition, a key / indicator unit 37 is provided on the top panel 11 of the housing, and the key / indicator unit 37 is a power switch key, a power indicator for notifying on / off of power, and switching on / off of projection A key or an indicator such as an overheat indicator for notifying when the projection switch key, the light source device, the display element, the control circuit or the like is overheated is disposed.

  Furthermore, an input / output connector section is provided on the back of the housing with a USB terminal, a D-SUB terminal for video signal input to which analog RGB video signals are input, an S terminal, an RCA terminal, an audio output terminal, etc. Various terminals (groups) 20 such as a power supply adapter plug are provided. Further, a plurality of air 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 a housing (not shown) and the left side panel 15 and the front panel 12 which are side plates shown in FIG. Further, an air inlet 18 is also formed in a corner near the rear panel of the left panel 15 and the rear panel 13.

  Next, the projection device control means of the projection device 10 will be described using the functional block diagram of FIG. The projection device control means comprises 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 which fixedly stores operation programs such as various settings, and a RAM used as a work memory. ing.

  Then, image signals of various standards input from the input / output connector unit 21 by the projection device control means are 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 to the image signal of the above, it is outputted to the display encoder 24.

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

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

  Further, the image compression / decompression unit 31 performs recording processing to sequentially write the luminance signal and the color difference signal of the image signal to the memory card 32 as a removable recording medium by data compression by processing such as ADCT and Huffman coding. .

  Furthermore, the image compression / decompression unit 31 reads out 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. Processing is performed to enable display of a moving image or the like based on image data stored in the memory card 32 and output to the display encoder 24 via the unit 23.

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

  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, and converts the sound data into analog in the projection mode and the reproduction mode, and drives the speaker 48 to emit a loud sound.

  Further, the control unit 38 controls a light source control circuit 41 as light source control means, and the light source control circuit 41 is configured to emit light of a predetermined wavelength band required at the time of image generation from the light source device 60. The light source device 60 is controlled individually to emit red, green and blue wavelength band lights. Then, the light source control circuit 41 emits light of each color wavelength band with the brightness corresponding to a large number of projection modes according to the setting corresponding to energy saving and the environment around the projection place. In the present embodiment, six types of projection modes are set as described later.

  On the other hand, in the control unit 38, the diffusion plate control unit 42 is connected via the system bus (SB). The diffusion plate control unit 42 adjusts the value of the drive current of the excitation light source formed by the semiconductor light emitting device according to the plurality of projection modes described above to adjust the emission intensity of the excitation light source. The rotation control of the diffusion plate of the diffusion plate apparatus described later is performed in accordance with the light emission intensity.

  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 power off of the main body of the projection device 10 by a timer or the like, or depending on the result of temperature detection by the temperature sensor. It also performs control such as turning off the power.

  Next, the internal structure of the projection device 10 will be described based on FIG. FIG. 3 is a schematic plan view showing the internal structure of the projection apparatus 10. As shown in FIG. The projection apparatus 10 includes a control circuit board 241 in the vicinity of the right side panel 14. The control circuit board 241 includes a power supply circuit block, a light source control block, and the like. In addition, the projection device 10 includes the light source device 60 on the side of the control circuit board 241, that is, at the substantially central portion of the casing of the projection device 10. Furthermore, in the projection device 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 side panel 15.

  The light source device 60 is a red light source device 120 that is a light source of red wavelength band light, an excitation light irradiation device 70 that is a light source of blue wavelength band light and is also an excitation light source, and a light source of green wavelength band light And a green light source device 80. The green light source device 80 is configured of the excitation light irradiation device 70 and the fluorescent plate device 100. Furthermore, the light source device 60 includes a diffusion plate device 400 described later. The light source device 60 is provided with a light guide optical system 140 for guiding and emitting the red, green and blue color wavelength bands. The light guiding optical system 140 condenses each color wavelength band light emitted from each color light source device on the entrance of the light tunnel 175.

  The excitation light irradiation device 70 is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the projector 10 housing. The excitation light irradiation device 70 includes a light source group including 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 light of emitted light from each blue laser diode 71. A reflection mirror group 75 for converting the axis by 90 degrees in the direction of the front panel 12, a condenser lens 78 for condensing light emitted from each blue laser diode 71 reflected by the reflection mirror group 75, a blue laser diode 71 and a right panel And a heat sink 81 or the like disposed therebetween.

  The light source group is configured by arranging a plurality of blue laser diodes 71 in a matrix. Further, on the optical axis of each blue laser diode 71, a collimator lens 73 for converting each emitted light from each blue laser diode 71 into parallel light so as to enhance directivity of each is arranged. The reflection mirror group 75 is formed by arranging a plurality of reflection mirrors in a step-like manner and integrated with the mirror substrate 76 to perform position adjustment, and the cross-sectional area of the light beam emitted from the blue laser diode 71 is The light 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. Furthermore, a cooling fan 261 is disposed also between the reflecting mirror group 75 and the rear panel 13, and the reflecting mirror group 75 and the condenser lens 78 are cooled by the cooling fan 261.

A diffuser plate device 400 is disposed on the side of the front panel 12 of the condenser lens 78 of the excitation light irradiation device 70 and on the incident light path where the excitation light is incident on the fluorescent plate 101 such as a fluorescent wheel. In the diffusion plate device 400, a diffusion plate 401 such as a diffusion wheel disposed parallel to the front panel 12, that is, orthogonal to the optical axis of the light emitted from the excitation light irradiation device 70, and the diffusion plate A stepping motor 410 for rotating the plate 401 is provided. As described later, the diffusion plate 401 is provided with a plurality of diffusion regions having different diffusion degrees (hereinafter, referred to as “ diffusion angles ”) . The excitation light from the excitation light irradiation device 70 enters the diffusion plate of the diffusion plate 401 from the back panel 13 side, is diffused and transmitted, and is emitted to the front panel 12 side.

  The red light source device 120 is disposed between the diffusion plate device 400 and the fluorescent plate device 100. The red light source device 120 is provided with a red light source 121 arranged so that the optical axis is parallel to the blue laser diode 71, and a condenser lens group 125 for condensing the light emitted from the red light source 121. The red light source 121 is a red light emitting diode which is a semiconductor light emitting element that emits light in a red wavelength band. Then, in the red light source device 120, the optical axis of the red wavelength band light emitted by 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 It is arranged to intersect with. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right side panel 14 side of the red light source 121. A cooling fan 261 is disposed between the heat sink 130 and the front panel 12, and the red light source 121 is cooled by the cooling fan 261 and the heat sink 130.

  The fluorescent plate device 100 constituting the green light source device 80 is disposed in the vicinity of the front panel 12 on the optical path of the excitation light emitted from the excitation light irradiation device 70. The fluorescent plate device 100 is disposed parallel to the front panel 12, that is, orthogonal to the optical axis of the light emitted from the excitation light irradiation device 70, and a motor 110 for rotationally driving the fluorescent plate 101. And a condensing lens group 107 for condensing the luminous flux of excitation light emitted from the excitation light irradiation device 70 on the fluorescent plate 101 and condensing the luminous flux emitted from the fluorescent plate 101 toward the rear panel 13; And a condenser lens 115 for condensing a light flux emitted 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 receives, as excitation light, emission light from the excitation light irradiation device 70 via the condenser lens group 107 and emits fluorescence light in the green wavelength band, and the emission light from the excitation light irradiation device 70 A region that transmits or diffuses a certain excitation light 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 this groove is formed by silver deposition or the like. A layer of green phosphor is laid on the mirrored surface. Furthermore, when it is set as the area | region which permeate | transmits among the area | regions which permeate | transmit or diffusively transmit excitation light, the transparent base material which has translucency is inserted in the cutout pervious part of a base material. When it is set as the area | region which diffuses and permeate | transmits, the transparent base material which formed the fine unevenness | corrugation by the sand blast etc. is inserted in the surface.

  In the phosphor layer of the phosphor plate 101, when the green phosphor layer of the phosphor plate 101 is irradiated with blue wavelength band light as excitation light from the excitation light irradiation device 70, the green phosphor in the green phosphor layer is excited and green Green wavelength band light is emitted from the phosphor in all directions. The fluorescent light emitted is emitted to the back panel 13 side and enters the condensing lens group 107. On the other hand, the blue wavelength band light from the excitation light irradiator 70, which is incident on the area of the fluorescent plate 101 that transmits or diffuses the incident light, is transmitted or diffused through the fluorescent plate 101, and the back side of the fluorescent plate 101 (in other words, The light is incident on a condenser lens 115 disposed on the front panel 12 side.

  Then, the light guiding optical system 140 is a condensing lens for condensing ray bundles of red, green and blue wavelength bands, a reflection mirror for converting the optical axes of ray bundles of respective color wavelength bands into the same optical axis, It consists of a dichroic mirror etc. Specifically, the light guide optical system 140 includes the blue wavelength band light emitted from the excitation light irradiation device 70 and diffused and transmitted through the diffusion plate 401 and the green wavelength band light emitted from the fluorescent plate 101, and the red light source device The blue and red wavelength band light is transmitted to the position where the red wavelength band light emitted from 120 intersects, the green wavelength band light is reflected, and the optical axis of this green wavelength band light is 90 degrees to the left panel 15 direction A first dichroic mirror 141 for converting is disposed.

  In addition, the blue wavelength band light is reflected on the optical axis of the blue wavelength band light transmitted or diffused and transmitted through the fluorescent plate 101, that is, between the condenser lens 115 and the front panel 12, and the optical axis of this blue light is A first reflection mirror 143 that converts 90 degrees in the direction of the left panel 15 is disposed. A condenser lens 146 is disposed on the left side panel 15 side of the first reflection mirror 143, and a second reflection mirror 145 is disposed on the left side panel 15 side of the condenser lens 146. A condenser lens 147 is disposed on the rear panel 13 side of the second reflection mirror 145. The second reflection mirror 145 converts the optical axis of the blue wavelength band light reflected by the first reflection mirror 143 and incident through the condenser lens 146 by 90 degrees toward the back panel 13 side.

  Further, on the side of the left panel 15 of the first dichroic mirror 141, a condenser lens 149 is disposed. Furthermore, a second dichroic mirror 148 is disposed on the left panel 15 side of the focusing lens 149 and on the back panel 13 side of the focusing lens 147. The second dichroic mirror 148 reflects the red wavelength band light and the green wavelength band light, converts the 90 ° optical axis toward the rear panel 13 side, and transmits the blue wavelength band light.

  The optical axis of the red wavelength band light transmitted through the first dichroic mirror 141 and the optical axis of the green wavelength band light reflected by the first dichroic mirror 141 so as to coincide with the optical axis of the red wavelength band light It enters the lens 149. Then, the red and green wavelength band light transmitted through the condenser lens 149 is reflected by the second dichroic mirror 148 and condensed at the entrance of the light tunnel 175 via the condenser lens 173 of the light source side optical system 170. . On the other hand, the blue wavelength band light transmitted through the condensing lens 147 is transmitted through the second dichroic mirror 148, and is condensed at the entrance of the light tunnel 175 through the condensing 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 rear panel 13 side of the condenser lens 195 toward the projection-side optical system 220, so that part of the projection-side optical system 220 It is done.

  In the vicinity of the light tunnel 175, a condenser lens 173 for condensing the 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 condensed by the condensing lens 173 and are incident on the light tunnel 175. The light flux incident on the light tunnel 175 is converted by the light tunnel 175 into a light flux having a uniform intensity distribution.

  An optical axis conversion mirror 181 is disposed 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 condensing 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 to the display element 51 at a predetermined angle through the condenser lens 195 by the irradiation mirror 185. A heat sink 190 is provided on the side of the back panel 13 of the display element 51 to be a DMD, and the display element 51 is cooled by the heat sink 190.

  A light beam, which is 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 as projection light onto the screen via the projection side optical system 160. Be done. Here, the projection-side optical system 160 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 incorporated in a fixed barrel. Therefore, the fixed barrel provided with the movable lens group 235 is a variable focus type lens, and 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 irradiation device 70 and the red light source device 120 at different timings, red, green, and blue wavelength light beams are guided. Since the light is sequentially incident on the condenser lens 173 and the light tunnel 175 via the optical system 140 and is 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 serves as data. Accordingly, color images can be projected on the screen by displaying light of each color in a time division manner.

  And the projection apparatus 10 which concerns on this embodiment has six types of projection modes, when projecting an image on a screen. Here, these six types of projection modes are referred to as first to sixth projection modes. In the projection mode, the brightness of the projection light is adjusted and set according to energy saving measures and the surrounding environment at the time of projection (whether it is a bright place or a dark place, etc.). And the emitted light quantity of the excitation light irradiation apparatus 70 of the light source device 60 corresponding to 1st-6th projection mode is called 1st-6th excitation light emission mode, respectively. In the first to sixth excitation light emission modes, the values of the drive current of the excitation light irradiation device 70 are made different, and the emission light amounts of the excitation light emitted from the excitation light irradiation device 70 are set to be different. Here, in the first excitation light emission mode, the value of the drive current is the smallest, and the emission light amount is also the smallest. Then, in the order from the second excitation light emission mode to the sixth excitation light emission mode, the value of the drive current is set to increase and the emission light amount also increases. Therefore, the value of the drive current is the largest in the sixth excitation light emission mode, and the amount of emission light is also the largest.

  The adjustment of the emitted light amount of the excitation light in the excitation light irradiation device 70 is performed by adjusting the value of the drive current to adjust the emitted light amount of each of the plurality of blue laser diodes 71. It also includes the case of emitting some of the light and quenching the rest. Similarly, the red light source device 120 is configured to adjust the brightness in accordance with the projection mode.

  On the other hand, the diffusion plate device 400 also corresponds to the first to sixth projection modes. That is, the diffusion plate apparatus 400 has the diffusion plate 401 in which a plurality of diffusion regions having different diffusion angles are provided corresponding to the first to sixth excitation light emission modes. FIG. 4 is a schematic view of the diffusion plate 401 viewed from the front.

  As shown in FIG. 4, the diffusion plate 401 is provided with a first diffusion plate 421 to a sixth diffusion plate 426. Here, the first diffusion plate 421 to the sixth diffusion plate 426 are circumferentially arranged in order in the clockwise direction in the front view of the diffusion plate 401. The first diffusion plate 421 to the sixth diffusion plate 426 are each formed by blasting a glass substrate, a transparent resin substrate or the like, and are inserted into the cutout through holes of the substrate of the diffusion plate 401. . The first diffusion plate 421 to the sixth diffusion plate 426 are formed with different diffusion angles, diffusion rates, and the like, and are formed to diffuse and transmit coherent excitation light. Here, the diffusion angle and the like of the first diffusion plate 421 are formed to be the smallest, and the diffusion angle and the like are increased in order from the second diffusion plate 422 to the sixth diffusion plate 426. Therefore, the diffusion angle or the like of the sixth diffusion plate 426 is the largest.

  The diffusion plate 401 is rotationally driven by a stepping motor 410. The rotation of the stepping motor 410 is controlled by the diffusion plate control unit 42 (see FIG. 2). The rotation control is performed based on each excitation light emission mode corresponding to each projection mode. Specifically, for example, when the first projection mode is selected by the user or automatically, the excitation light irradiation device 70 is driven by the drive current set as the first excitation light emission mode, and a predetermined amount of emitted light is output. Excitation light is emitted. In the diffusion plate 401, the first diffusion plate 421 corresponding to the first excitation light emission mode is aligned on the optical axis of the light beam of the excitation light, that is, on the incident light path where the excitation light enters the fluorescent plate 101. The stepping motor 410 is controlled by the unit 42 to control the rotation of the diffusion plate 401. Thus, in the first projection mode, the excitation light is incident on the first diffusion plate 421 and diffused and transmitted.

  Then, when the second projection mode is selected, the excitation light irradiation device 70 is driven by the second excitation light emission mode set as the drive current larger than the first excitation light emission mode, and the excitation light is emitted. Ru. Corresponding to this, the diffusion plate control unit 42 controls the rotation of the diffusion plate 401 so that the excitation light is diffused and transmitted through the second diffusion plate 422 having a diffusion angle larger than that of the first diffusion plate 421. Similarly, the excitation light irradiation device 70 is driven by the drive current as the third to sixth excitation light emission modes corresponding to the third to sixth projection modes, and the third diffusion plate 423 to the sixth diffusion plate 426 The diffusion plate 401 is controlled so as to diffuse and transmit the excitation light.

  Next, another embodiment according to the present invention will be described based on FIG. FIG. 5 is a plan view schematically showing the light source device 60A. The diffusion plate apparatus 400 in this embodiment is a modification of the arrangement of the diffusion plate apparatus 400 in the above-described embodiment. In the present embodiment, the diffusion plate device 400 is between the red light source device 120 and the fluorescent plate device 100, and is an incident light path on which the excitation light is incident on the fluorescent plate device 100. It was disposed on the optical path of the fluorescent light to be emitted in the green wavelength band.

  In the diffusion plate device 400 in the present embodiment, in addition to the excitation light being incident from the side of the excitation light irradiation device 70 and being diffused and transmitted, the fluorescent light that is green wavelength band light emitted from the fluorescent plate device 100 is The light is incident from the back surface (in other words, the front panel 12 side) and diffused and transmitted. Then, the green wavelength band light incident on the diffusion plate device 400 and diffused and transmitted is reflected by the first dichroic mirror 141 toward the condensing lens 149.

  Next, still another embodiment according to the present invention will be described based on FIG. FIG. 6 is a plan view schematically showing the light source device 60B. In the present embodiment, in addition to the diffusion plate apparatus 400 in the above-described embodiment, another diffusion plate apparatus 500 is provided. The other diffusion plate device 500 shown here is disposed on the light path which has passed through the region through which the excitation light is transmitted or diffused and transmitted by the fluorescent plate 101 in the fluorescent plate device 100.

  Similar to the above-described diffusion plate device 400, the diffusion plate device 500 includes another diffusion plate 501 including six types of diffusion plates (first to sixth other diffusion plates) having different diffusion angles, and the other diffusion plate A stepping motor 510 that drives 501 is provided. Then, the diffusion plate control unit 42 controls the stepping motor 510 to control the rotational position of the other diffusion plate 501. Therefore, the blue wavelength band light transmitted or diffused and transmitted through the fluorescent plate device 100 has the other first of the other diffusion plates 501 corresponding to the first to sixth projection modes and the first to sixth excitation light emission modes. The sixth diffuser plate is aligned with the optical axis of blue wavelength band light.

  Here, the diffusion angles of the other first to sixth diffusion plates are set in accordance with the illuminance ratio when the green wavelength band light which is fluorescent light is projected on the screen. That is, the fluorescent plate device 100 is irradiated with excitation light corresponding to the first to sixth projection modes by the diffusion plate device 400. In this case, the illumination ratio when the green wavelength band light emitted from the fluorescent plate device 100 is projected on the screen is different for each of the first to sixth excitation light emission modes since the emission light amount of the excitation light is different. Become. That is, by selecting the first to sixth projection modes, the emitted light quantity of the excitation light is different, so the ratio of the brightness between the central part and the four corners of the screen when the green wavelength band light is projected onto the screen is , And each of the first to sixth projection modes.

  Therefore, the other first to sixth diffusers in the other diffusers 401 are formed with different diffusion angles so that the blue wavelength band light is projected at an illuminance ratio equal to the illuminance ratio of the green wavelength band light. did. The light source device 60B including the other diffusion plate device 500 formed in this manner operates as follows. For example, when the first projection mode is selected, the diffusion plate device 400 is controlled to rotate so that excitation light is diffused and transmitted through the first diffusion plate 421 in the diffusion plate device 400. At the same time, the other diffusion plate device 500 diffuses and transmits the blue wavelength band light, which is excitation light transmitted through or diffused and transmitted through the fluorescent plate device 100, through the other first diffusion plate of the other diffusion plate 501, Rotation control is performed.

  In the present embodiment, although the diffusion plate device 400 and the other diffusion plate device 500 are provided, a light source device of a projection device in which only the other diffusion plate device 500 is provided without providing the diffusion plate device 400 You can also

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above embodiment, A change can be added suitably and can be implemented. For example, although six types of projection modes have been described in the above embodiment, the present invention can be implemented with two or more types. In this case, the diffusion plate of the diffusion plate devices 400 and 500 may be provided with two or more kinds of diffusion plates having different diffusion angles.

  As described above, the projection apparatus 10 of the present embodiment is provided with the excitation light irradiation apparatus 70 as the excitation light source, the fluorescent plate apparatus 100, and the diffusion plate apparatus 400. The diffusion plate device 400 is provided on the incident light path where the excitation light is incident on the fluorescent plate device 100.

  Thereby, even when the emitted light amount of the excitation light source is adjusted, the excitation light is diffused and transmitted to the diffusion plate having a diffusion angle corresponding to various emitted light amounts, and the fluorescent plate device 100 is irradiated with the excitation light. Can. Therefore, a diffusion plate with a large diffusion angle can be associated with excitation light with a large emitted light amount, and a diffusion plate with a small diffusion angle can be associated with excitation light with a small emitted light amount. Therefore, the burn-in and temperature quenching of the phosphor layer can be reliably prevented for excitation light having a large emitted light quantity, and in the case of excitation light having a small emitted light quantity, the excitation light is diffused and transmitted by the diffusion plate having a small diffusion angle. Therefore, the excitation light is irradiated to a predetermined range of the phosphor layer with appropriate illuminance, and the utilization efficiency of the light of the excitation light source is not reduced.

  Moreover, the fluorescent plate 101 was formed as a fluorescent wheel. As a result, the excitation light can be irradiated while rotating the phosphor plate provided with the phosphor layer, so that the burn-in and temperature quenching of the phosphor layer can be further reduced. Moreover, the diffusion plate 401 was formed as a diffusion wheel. As a result, it is possible to easily form a diffusion plate having a plurality of diffusion regions having different diffusion angles, and to easily switch the diffusion regions.

  In addition, the fluorescent plate 101 of the fluorescent plate device 100 has a region that transmits or diffuses the excitation light from the excitation light irradiation device 70 that is the excitation light source. Thereby, the blue wavelength band light which is the emitted light from the excitation light irradiation apparatus 70 can be made into a blue light source. Therefore, since it is not necessary to provide a blue light source device separately, while being able to reduce the cost concerning manufacture, the projection apparatus 10 can be comprised compactly.

  Moreover, the excitation light irradiation apparatus 70 which is an excitation light source has the 1st-6th excitation light emission mode from which the emitted light quantity of excitation light differs. The diffusion plate device 400 controls the rotation of the diffusion plate 401 having the first to sixth diffusion plates having different diffusion angles in accordance with the first to sixth excitation light irradiation modes by the diffusion plate control unit 42. Thereby, the rotation of the diffusion plate device 400 is controlled corresponding to the emitted light amount of the excitation light irradiation device 70, and the diffusion plate of the optimum diffusion angle is made to correspond to the emitted light amounts of various excitation lights to diffuse the excitation light. It can be transparent.

  Further, the emitted light amount of the excitation light irradiation device 70 is formed so as to be adjustable according to the drive current. Then, the diffusion plate control unit 42 sets the diffusion plate so that the diffusion angle in the excitation light emission mode in which the drive current is large is larger than the diffusion angle in the excitation light emission mode in which the drive current of the excitation light irradiation device 70 is small. The rotation control of the device 400 is performed. Thereby, when the drive current of the excitation light irradiation apparatus 70 is small, ie, when the emitted light quantity of excitation light is small, a diffusion plate with a small diffusion angle can be used. And when the drive current of the excitation light irradiation apparatus 70 is large, ie, when the emitted light quantity of excitation light is large, a diffusion plate with a large diffusion angle can be used.

  Further, the diffusion plate device 400 was disposed on the optical path of both excitation light, which is incident light to the fluorescent plate device 100, and green wavelength band light, which is emitted light from the fluorescent plate device 100. Thereby, the diffusion plate apparatus 400 can diffuse and transmit not only the excitation light but also the green wavelength band light which is fluorescence light. Therefore, color unevenness on the screen of the green wavelength band light can be suppressed.

  In addition to the diffuser plate device 400, the light source device 60 of the projection device 10 further includes another diffuser plate device 500. The other diffusion plate 501 of the other diffusion plate device 500 is provided with first to sixth diffusion plates having different diffusion angles. The other diffusion plate device 500 is disposed on the light path of the excitation light transmitted through the fluorescent plate device 100 or diffusely transmitted. Thereby, the illumination ratio on the screen of green wavelength band light and the illumination ratio on the screen of blue wavelength band light can be made equal. Therefore, color unevenness caused by the difference in illuminance ratio between the green wavelength band light and the blue wavelength band light is eliminated, and clear projection light can be obtained.

  Further, the projection device 10 includes a red light source device 120 as a red light source, a display element 51 which emits light from the light source to form image light, an optical system which guides each color wavelength band light to the display element 51, display The projection side optical system 220 etc. which project the image light formed of the element 51 on a screen are provided. As a result, it is possible to provide the projection device 10 capable of diffusing and transmitting the fluorescent plate device 100 without reducing the utilization efficiency of the excitation light.

  Also, the embodiments described above are presented as examples, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in other various forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

In the following, the invention described in the first claim of the present application is appended.
[1] excitation light source,
A phosphor plate provided with a phosphor layer to be irradiated with excitation light of the excitation light source;
A diffusion plate provided with a plurality of diffusion regions having different diffusion angles;
Have
The light source device characterized in that the diffusion plate is provided on an incident light path where the excitation light is incident on the fluorescent plate.
[2] The light source device according to [1], wherein the fluorescent plate is a fluorescent wheel, and the diffusion plate is a diffusion wheel.
[3] A fluorescent plate apparatus having the fluorescent plate, and a diffusion plate apparatus having the diffusion plate,
The light source device according to [1] or [2], wherein the fluorescent plate of the fluorescent plate device has a region that transmits or diffuses the excitation light from the excitation light source.
[4] The excitation light source has a plurality of excitation light emission modes in which the amount of emission light of the excitation light is different,
The light source device according to any one of [1] to [3], wherein the diffusion plate is controlled to rotate by a diffusion plate control unit in accordance with the excitation light emission mode.
[5] The emitted light quantity of the excitation light of the excitation light source is formed so as to be adjustable according to a drive current,
The diffusion plate control unit controls the rotation of the diffusion plate device such that the diffusion angle in the excitation light emission mode in which the drive current is large is larger than the diffusion angle in the excitation light emission mode in which the drive current of the excitation light source is small. The light source device according to [4], characterized in that:
[6] The diffusion plate is provided in an incident light path where the excitation light is incident on the fluorescent plate, and is provided in an optical path of fluorescent light which is emitted light from the fluorescent plate. The light source device according to any one of the above [5].
[7] Another diffuser plate device having another diffuser plate provided with a plurality of diffusion regions having different diffusion angles is further provided,
The light source device according to any one of the above [3] to [6], wherein the other diffusion plate device is provided on an optical path where the excitation light is transmitted or diffused and transmitted through the fluorescent plate.
[8] The excitation light source formed of a semiconductor light emitting element emitting blue wavelength band light, the fluorescent plate formed capable of emitting fluorescent light of green wavelength band light, and the diffusion plate [1] ] The light source device according to any one of the above [7],
The light source device further includes a red light source device formed of a semiconductor light emitting element that emits red wavelength band light, and a light guiding optical system that guides each color wavelength band light and emits each color wavelength band light. And
A display element which is irradiated with light source light from the light source device to form image light;
A projection-side optical system for projecting the image light emitted from the display element onto a screen;
The display element, and a projection device control means for controlling the light source device;
A projection device characterized by having.

DESCRIPTION OF SYMBOLS 10 Projection apparatus 11 Top panel 12 Front panel 13 Rear panel 14 Right panel 15 Left panel 17 Exhaust hole 18 Intake hole 19 Lens cover 21 I / O connector part 22 I / O interface 23 Image conversion part 24 Display encoder 25 Video RAM
Reference Signs List 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 42 diffusion plate control unit 43 cooling fan drive control circuit 45 lens motor 47 audio processing Part 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 Condenser 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 first reflecting mirror 145 second reflecting mirror 146 condensing lens 147 condensing Lens 148 second dichroic mirror 149 condenser lens 160 projection side optical system 170 light source side optical system 173 condenser lens 175 light tunnel 178 condenser lens 181 optical axis conversion mirror 183 condenser lens 185 irradiation mirror 190 heat sink 195 condenser lens 220 projection Optical system 225 Fixed lens group 235 Movable lens group 241 Control circuit board 261 Cooling fan 400 Diffusion plate device 401 Diffusion plate 410 Stepping motor 421 First diffusion plate 422 Second diffusion plate 423 Third diffusion plate 424 Fourth diffusion plate 425 5 diffuser plate 426 sixth diffuser plate 500 other diffuser plate device 501 other diffuser plate 510 stepping motor

Claims (7)

An excitation light source,
A phosphor plate provided with a phosphor layer to be irradiated with excitation light of the excitation light source;
A diffusion plate provided with a plurality of diffusion regions having different diffusion degrees;
A diffusion plate control unit which drives the diffusion plate and switches the diffusion region;
Have
The diffusion plate is provided on an incident light path where the excitation light is incident on the fluorescent plate ,
The excitation light source has a plurality of excitation light emission modes that differ in the amount of emission of the excitation light according to the drive current,
The light source device, wherein the diffusion plate control unit switches the diffusion plate region according to a drive current of the excitation light source. Before SL diffuser controller, than the diffusion degree of the excitation light emitted mode drive current is small in the excitation light source, the diffusion plate region as towards the diffusion degree of the drive current is large the excitation light emitting mode increases The light source device according to claim 1 , wherein the light source device is switched . An excitation light source,
A phosphor plate provided with a phosphor layer to be irradiated with excitation light of the excitation light source;
A diffusion plate provided with a plurality of diffusion regions having different diffusion degrees;
A diffusion plate control unit which drives the diffusion plate and switches the diffusion region;
Have
The diffusion plate, the with excitation light is provided in the incident light path to be incident on the fluorescent plate, a light source device you characterized in that provided on the optical path of the fluorescence light which is light emitted from the fluorescent plate. The light source device according to any one of claims 1 to 3, wherein the fluorescent plate is a fluorescent wheel, and the diffusion plate is a diffusion wheel. Before Symbol fluorescent plate, a light source device according to any one of claims 1 to 4, characterized in that it comprises a region for transmitting or diffuse and transmit the excitation light from the excitation light source. An excitation light source,
A phosphor layer to which the excitation light of the excitation light source is irradiated, and a phosphor plate provided with a region for transmitting or diffusing and transmitting the excitation light from the excitation light source;
A diffusion plate provided with a plurality of diffusion regions having different diffusion degrees;
A diffusion plate control unit which drives the diffusion plate and switches the diffusion region;
Have
There are further provided other diffusion plates provided with a plurality of diffusion regions having different diffusion degrees,
The diffusion plate is provided on an incident light path where the excitation light is incident on the fluorescent plate, and
The other diffusion plate, the excitation light is light source device you characterized in that provided in transmission or diffuse transmission light path of said fluorescent screen. Claims 1 to have said excitation light source formed by the semiconductor light emitting element that emits light in the blue wavelength band, and the fluorescent screen of fluorescent light of the green wavelength band light is emitted can be formed, the, said diffuser plate The light source device according to any one of
The light source device further includes a red light source device formed of a semiconductor light emitting element that emits red wavelength band light, and a light guiding optical system that guides each color wavelength band light and emits each color wavelength band light. And
A display element which is irradiated with light source light from the light source device to form image light;
A projection-side optical system for projecting the image light emitted from the display element onto a screen;
The display element, and a projection device control means for controlling the light source device;
A projection device characterized by having.

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