JP2015232677A - Light source device and projection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device and a projection device in which adjustment work after the assembly of the projection device is reduced and illumination distributions in screens of respective colors are matched.SOLUTION: A projection device 10 includes an excitation light irradiation device 70 which is an excitation light source and light source control means 41 which controls the excitation light source, so as to emit a light beam flux from the excitation light source at a predetermined timing. Further, the fluorescent plate 101 of a fluorescent plate device 100 includes a fluorescent light emission area 103 on which a phosphor layer irradiated with light emitted from the excitation light irradiation device 70 as excitation light is provided and a diffuse transmission area 104 which diffuses and transmits the light emitted from the excitation light source and where a plurality of diffusion plates whose diffusion angles are different are adjacently formed.

Description

  The present invention relates to a light source device and a projection device that include a fluorescent plate having a phosphor layer and a diffuse transmission region.

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

  Projectors that are projection devices have been used for a wide range of applications from business presentations to home use with the spread of video equipment such as personal computers and DVD players. Conventionally, projectors using a high-intensity discharge lamp as a light source have been the mainstream in such projectors. However, in recent years, a plurality of semiconductor light emitting elements such as laser diodes have been used as the light source, and the semiconductor light emitting element is used as an excitation light source. Various projection apparatuses including a fluorescent plate have been developed.

  The projection device disclosed in Patent Literature 1 includes a red light source device, a phosphor layer that emits fluorescent light in a green wavelength band when emitted light from an excitation light irradiation device that is blue wavelength band light is emitted as excitation light, and excitation And a fluorescent plate device having a fluorescent plate such as a fluorescent wheel having a diffuse transmission region for diffusing and transmitting the emitted light from the light irradiation device. The excitation light irradiating device is also used as a blue light source because the emitted light is diffused and transmitted through the diffusion transmission region of the fluorescent plate.

JP 2013-196946 A

  In general, when various devices are incorporated in the projection apparatus, a mounting dimensional error occurs. Also in the projection apparatus disclosed in Patent Document 1, there is a dimensional error in mounting, and the distance between the excitation light irradiation apparatus and the fluorescent plate apparatus is different for each projection apparatus.

  When the distance between the excitation light irradiation device and the fluorescent plate device is different, the size and shape of the irradiation spot of the excitation light applied to the phosphor layer of the fluorescent plate are different. If it does so, the illumination intensity distribution with respect to the screen of the green wavelength band light made into fluorescence emission light will become different for every projection apparatus. If it does so, the illumination intensity distribution with respect to the screen of a blue wavelength band light and a green wavelength band light will differ, and an unnatural feeling will arise in the image projected on a screen.

  Therefore, in the projection device of Patent Document 1, after the assembly of the projection device is completed, the position of the fluorescent plate device is adjusted as appropriate, the distance between the excitation light irradiation device and the fluorescent plate device is adjusted, and the screen of blue wavelength band light is adjusted. Adjustment work is performed to match the illuminance distribution with the illuminance distribution of the green wavelength band light. However, such adjustment work is troublesome and complicated. In addition, the brightness of the fluorescent light may be attenuated by adjusting the position of the fluorescent plate.

  Therefore, the object of the present invention is to reduce the adjustment work after assembling the projection apparatus, to match the illuminance distribution between the light source light emitted from the excitation light source and the fluorescent light from the phosphor layer, and to feel uncomfortable. Provided are a light source device capable of obtaining clear projection light having no light and a projection device including the light source device.

  The light source device according to the present invention includes an excitation light source, light source control means for controlling the excitation light source so as to emit a light beam from the excitation light source at a predetermined timing, and light emitted from the excitation light source is irradiated as excitation light. A fluorescent plate provided with a fluorescent light emitting region provided with a phosphor layer, and a diffused transmission region in which a plurality of diffusion plates having different diffusion angles are formed adjacent to each other to diffuse and transmit light emitted from the excitation light source; It is characterized by having.

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

  According to the present invention, it is possible to easily match the illuminance distribution of projection light using light emitted from the excitation light source as light source and projection light using fluorescent light emitted from the phosphor layer as a light source.

It is an external appearance perspective view which shows the projector which concerns on embodiment of this invention. It is a figure which shows the functional block of the projection apparatus which concerns on embodiment of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on embodiment of this invention. The fluorescent plate which concerns on embodiment of this invention is shown, (a) is a front schematic diagram of a fluorescent plate, (b) is a partial cross section schematic diagram. It is a front schematic diagram of the diffusion plate which shows the range where light is irradiated to the diffusion plate which concerns on embodiment of this invention. It is a schematic diagram which shows the relationship between the position of the fluorescent screen apparatus which concerns on embodiment of this invention, and excitation light.

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

  As shown in FIG. 1, the projection device 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a side plate in front of the housing of the projection device 10. At the same time, the front panel 12 is provided with a plurality of exhaust holes 17. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

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

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

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

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

  The image signal of various standards input from the input / output connector unit 21 by the projection device control means is in a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). After being converted so as to be unified into the image signal, it is output to the display encoder 24.

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

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

  The image compression / decompression unit 31 performs a recording process in which the luminance signal and the color difference signal of the image signal are data-compressed by a process such as ADCT and Huffman encoding, and sequentially written in a memory card 32 that is a detachable recording medium. .

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

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

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

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

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

  Next, the internal structure of the projection apparatus 10 will be described with reference to FIG. FIG. 3 is a schematic plan view showing the internal structure of the projection apparatus 10. The projection apparatus 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power circuit block, a light source control block, and the like. In addition, the projection device 10 includes a light source device 60 at the side of the control circuit board 241, that is, at a substantially central portion of the housing of the projection device 10. Further, in the projector 10, a light source side optical system 170 and a projection side optical system 220 are disposed between the light source device 60 and the left panel 15.

  The light source device 60 is a red light source device 120 that is a light source of red wavelength band light, a light source of blue wavelength band light, an excitation light irradiation device 70 that is an excitation light source, and a light source of green wavelength band light. A green light source device 80. The green light source device 80 includes an excitation light irradiation device 70 and a fluorescent plate device 100. The light source device 60 is provided with a light guiding optical system 140 that guides and emits light of each wavelength band of red, green, and blue. The light guide optical system 140 condenses each color wavelength band light emitted from each color light source device at the entrance of the light tunnel 175.

  An excitation light irradiation device 70 that is an excitation light source constituting the green light source device 80 is disposed in the vicinity of the rear panel 13 at a substantially central portion in the left-right direction of the housing of the projection device 10. The excitation light irradiation device 70 includes a light source group including a blue laser diode 71 that is a plurality of semiconductor light emitting elements arranged so that the optical axis is parallel to the back panel 13, and light emitted from each blue laser diode 71. Reflective mirror group 75 that converts the axis 90 degrees in the direction of the front panel 12, a condensing lens 78 that collects the emitted light from each blue laser diode 71 reflected by the reflective mirror group 75, and the blue laser diode 71 and the right panel 14 and the like.

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

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

  The red light source device 120 includes a red light source 121 disposed so that the optical axis is parallel to the blue laser diode 71, and a condensing lens group 125 that condenses light emitted from the red light source 121. The red light source 121 is a red light emitting diode that is a semiconductor light emitting element that emits light in a red wavelength band. In the red light source device 120, the optical axis of the red wavelength band light emitted from the red light source device 120 is the optical wavelength axis of the blue wavelength band light emitted from the excitation light irradiation device 70 and the green wavelength band light emitted from the fluorescent plate 101. It is arranged to intersect. Furthermore, the red light source device 120 includes a heat sink 130 disposed on the right 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 includes a fluorescent plate 101 arranged so as to be parallel to the front panel 12, that is, orthogonal to the optical axis of the emitted light from the excitation light irradiation device 70, and a motor 110 that rotationally drives the fluorescent plate 101. A condensing lens group 107 that condenses the light bundle of the excitation light emitted from the excitation light irradiation device 70 on the fluorescent plate 101 and condenses the light bundle emitted from the fluorescent plate 101 toward the rear panel 13, and the fluorescent plate 101. And a condensing lens 115 that condenses the light bundle emitted in the direction of 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.

  When the phosphor layer in the fluorescence emission region of the fluorescent plate 101 is irradiated with blue wavelength band light as excitation light from the excitation light irradiation device 70, the green phosphor is excited. Then, green wavelength band light is emitted from this green phosphor in all directions. The fluorescent light bundle is emitted toward the rear panel 13 and enters the condenser lens group 107. On the other hand, the blue wavelength band light from the excitation light irradiation device 70 that has entered the diffuse transmission region of the fluorescent plate 101 is diffused and transmitted through the fluorescent plate 101 and arranged on the back side of the fluorescent plate 101 (in other words, on the front panel 12 side). The light enters the condensing lens 115.

  In the present embodiment, the diffuse transmission region of the fluorescent plate 101 is formed by two diffusion plates having different diffusion angles. The time distribution during which the emitted light from the excitation light irradiation device 70 is transmitted to each diffusion plate is determined by the size of the irradiation spot of the excitation light irradiated on the phosphor layer of the phosphor plate 101 and the fluorescence emitted from the phosphor layer. It is determined and set according to the ambient illuminance ratio of light. The light source control circuit 41 controls the excitation light irradiation device 70 based on the set time distribution. Details will be described later.

  The light guide optical system 140 includes a condensing lens that condenses the light bundles of the red, green, and blue wavelength bands, and a reflection mirror that converts the optical axes of the light bundles of the respective color wavelength bands into the same optical axis, It consists of a dichroic mirror. Specifically, the light guide optical system 140 includes a blue wavelength band light emitted from the excitation light irradiation device 70, a green wavelength band light emitted from the fluorescent plate 101, and a red wavelength band emitted from the red light source device 120. A first dichroic mirror 141 that transmits blue and red wavelength band light, reflects green wavelength band light, and converts the optical axis of the green wavelength band light by 90 degrees in the direction of the left panel 15 at a position where the light intersects. Has been placed.

  Further, the blue wavelength band light is reflected on the optical axis of the blue wavelength band light 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 the blue light is changed to the left panel. A first reflecting mirror 143 that converts 90 degrees in 15 directions is arranged. A condensing lens 146 is disposed on the left panel 15 side of the first reflecting mirror 143, and a second reflecting mirror 145 is disposed on the left panel 15 side of the condensing lens 146. A condensing lens 147 is disposed on the rear panel 13 side of the second reflecting 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 via the condenser lens 146 to the rear panel 13 side by 90 degrees.

  A condensing lens 149 is disposed on the left panel 15 side of the first dichroic mirror 141. Further, a second dichroic mirror 148 is disposed on the left panel 15 side of the condenser lens 149 and on the rear panel 13 side of the condenser lens 147. The second dichroic mirror 148 reflects the red wavelength band light and the green wavelength band light, converts the 90 ° optical axis to the back 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 are collected. The light enters the lens 149. Then, the red and green wavelength band light transmitted through the condensing lens 149 is reflected by the second dichroic mirror 148 and is condensed at the entrance of the light tunnel 175 via the condensing lens 173 of the light source side optical system 170. . On the other hand, the blue wavelength band light that has passed through the condenser lens 147 passes through the second dichroic mirror 148 and is condensed at the entrance of the light tunnel 175 via the condenser lens 173.

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

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

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

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

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

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

  Next, the fluorescent screen device 100 and the fluorescent screen 101 will be described with reference to FIG. The fluorescent plate 101 is connected to the motor shaft 112 of the motor 110 and is rotationally driven by the motor 110. The fluorescent plate 101 is irradiated with an irradiation spot S from the excitation light irradiation device 70 that is an excitation light source through the condenser lens group 107 as excitation light at the irradiation spot S, and emits fluorescent light in the green wavelength band, and And a diffusion transmission region 104 that diffuses and transmits the light emitted from the excitation light irradiation device 70 is provided. The diffusion transmission region 104 is formed in an arc shape, and the first diffusion plate 105 and the second diffusion plate 106 which are two diffusion plates having different diffusion angles are provided in an annular shape. .

  The substrate 102 of the fluorescent plate 101 is a metal substrate made of copper, aluminum, or the like. An annular groove is formed on the surface of the substrate 102 on the side of the excitation light irradiation device 70, and the bottom of this groove is silver evaporated. Mirror processing by etc. The fluorescent light emitting region 103 is formed by laying a green phosphor layer on the mirrored surface. Further, the diffuse transmission region 104 is formed by inserting a transparent base material having fine irregularities formed on the surface thereof by sandblasting or the like in the cut-out through hole portion of the base material 102. The first diffusion plate 105 and the second diffusion plate 106 constituting the diffuse transmission region 104 are formed with different diffusion angles by adjusting fine irregularities on the surface. In the present embodiment, the diffusion angle of the first diffusion plate 105 is formed smaller than the diffusion angle of the second diffusion plate 106.

  The fluorescent plate 101 is rotationally driven by a motor 110 at a constant speed. In addition, the rotation position of the fluorescent plate 101 is detected by a photo sensor (not shown). On the other hand, the excitation light irradiation device 70 is controlled to emit light at a predetermined timing by a light source control circuit 41 (see FIG. 2) which is a light source control means. In this way, the fluorescent plate 101 is rotated at a constant speed, and the excitation light irradiation device 70 is controlled by the light source control circuit 41. Therefore, the excitation light irradiation is performed at the timing when the predetermined range of the fluorescent light emitting region 103 passes the irradiation spot S. Light is emitted from the device 70. Then, green wavelength band light is emitted from the phosphor layer in the fluorescence emission region 103. In addition, if light is emitted from the excitation light irradiation device 70 at a timing when the diffuse transmission region 104 in a predetermined range passes through the irradiation spot S, blue wavelength band light can be obtained.

  Further, in the light source control circuit 41, a time distribution of emission time for emitting light to the first diffusion plate 105 and the second diffusion plate 106 is set. For example, when a long emission time with respect to the first diffusion plate 105 is set, light is emitted from the excitation light irradiation device 70 while the range BL1 shown in FIG. Similarly, when a long emission time with respect to the second diffusion plate 106 is set, light is emitted from the excitation light irradiation device 70 while the range BL2 shown in FIG. As described above, by changing the time distribution for diffusing and transmitting the blue wavelength band light to the first diffusion plate 105 and the second diffusion plate 106 having different diffusion angles, the peripheral illuminance ratio of the blue wavelength band light is changed. Can do.

  Then, the time distribution for diffusing and transmitting the blue wavelength band light to the first diffusion plate 105 and the second diffusion plate 106 is set corresponding to the size of the irradiation spot S of the excitation light irradiated to the fluorescent light emitting region 103. Then, the ambient illuminance ratio of the blue wavelength band light can be matched with the peripheral illuminance ratio of the green wavelength band light.

  For example, as shown in FIG. 6, the irradiation spot SQ of the excitation light at the position Q that is the range of the dimensional error in assembling the fluorescent screen device 100 is smaller than the irradiation spot SP at the assembly position P of the design value. The brightness (illuminance) of the peripheral part with respect to the brightness of the center of the irradiation spot SQ decreases from the central part. However, the area of the irradiation spot SQ is smaller than the area of the irradiation spot SP, and the brightness (illuminance) of the peripheral part with respect to the brightness of the center of the irradiation spot SQ is the brightness of the peripheral part with respect to the brightness of the center of the irradiation spot SP. Brighter than the brightness (illuminance). Therefore, the ambient illuminance ratio of the green wavelength band light becomes small. Therefore, the time distribution for diffusing and transmitting the blue wavelength band light is set so as to increase the time during which the light is diffused and transmitted to the first diffusion plate 105 having a small diffusion angle, as indicated by BL1 in FIG.

  Similarly, as shown in FIG. 6, the irradiation spot SR of the excitation light at the position R is larger than the irradiation spot SP. The area of the irradiation spot SR is larger than the area of the irradiation spot SP, and the brightness (illuminance) of the peripheral portion with respect to the brightness of the center of the irradiation spot SR is the brightness of the peripheral portion with respect to the brightness of the center of the irradiation spot SP ( It is darker than (illuminance). Therefore, the ambient illuminance ratio of the green wavelength band light is increased. Therefore, the time distribution for diffusing and transmitting the blue wavelength band light is set so as to increase the time during which the light is diffused and transmitted to the second diffusion plate 106 having a large diffusion angle, as indicated by BL2 in FIG.

  The first diffusion plate 105 and the second diffusion plate 106 shown in BL1 and BL2 from which light is emitted from the excitation light irradiation device 70 while passing through the irradiation spot S (SQ, SP, SR), As shown in FIG. 6, the ratio is set to three stages. However, the ratio is not limited to this, and may be set by changing the ratio more finely according to the dimensional error in assembly. Further, as the diffusion plates having different diffusion angles, the two types of diffusion plates, the first diffusion plate 105 and the second diffusion plate 106, are provided, but not limited to this, three or more types of diffusion plates having different diffusion angles are provided. A diffusion plate may be provided, and the ratio of these diffusion plates may be controlled.

  The range of the dimensional error from the position Q to the position R is about 1 mm or less. In the present embodiment, as shown in FIG. 6, the focal point F of the emitted light BL from the excitation light irradiation device 70 is formed to be closer to the excitation light irradiation device 70 than the fluorescent plate 101.

  In addition to the above, the time distribution for diffusing and transmitting the blue wavelength band light to the first diffusion plate 105 and the second diffusion plate 106 may be determined by measuring the ambient illuminance ratio of the green wavelength band light. it can. Specifically, after the assembly of the projection device 10 is completed, the green wavelength band light is projected onto the screen, the ambient illuminance ratio of the green wavelength band light is measured, and the blue wavelength band light is the first based on the measurement result. The time distribution for diffusing and transmitting the diffusion plate 105 and the second diffusion plate 106 can be determined. The ambient illuminance ratio of the green wavelength band light may be measured manually with an illuminance measuring machine. Alternatively, the projector 10 is provided with an illuminance sensor, and the illuminance sensor is connected to the light source control circuit 41, and the ambient light illuminance ratio of the green wavelength band light is measured by the illuminance sensor to automatically set the time distribution. You can also.

  Note that the time distribution in which the blue wavelength band light is diffused and transmitted to the first diffusion plate 105 and the second diffusion plate 106 is that the time distribution of one diffusion plate is 0, that is, the blue wavelength band light is transmitted only to the other diffusion plate. May be diffusely transmitted.

  As described above, the light source device 60 according to the embodiment of the present invention is an excitation light source, and the excitation light irradiation device 70 controlled by the light source control circuit 41 serving as a light source control unit, and the fluorescent light emission provided with the phosphor layer. A fluorescent plate 101 having a diffusion transmission region 104 formed by adjoining a region 103 and a first diffusion plate 105 and a second diffusion plate 106 having different diffusion angles is provided.

  Thereby, the blue wavelength band light can be diffused and transmitted through each of the first diffusion plate 105 and the second diffusion plate 106 having different diffusion angles. Therefore, by changing the diffusion angle of the blue wavelength band light, it is possible to change the state of the light density distribution between the center and the periphery in the light beam of the blue wavelength band light, so the peripheral illuminance ratio of the fluorescent light emitted from the fluorescent plate 101 The ambient illuminance ratio of the blue wavelength band light can be adjusted according to the above. Therefore, after the fluorescent plate 101 is assembled, the image projected on the screen is not uncomfortable and clear projection can be performed without fine adjustment of the distance between the fluorescent plate 101 and the excitation light irradiation device 70. .

  Further, since the first diffusion plate 105 and the second diffusion plate 106 having different diffusion angles are formed adjacent to each other, the switching structure of the first diffusion plate 105 and the second diffusion plate 106 can be easily made. The first diffusion plate 105 and the second diffusion plate 106 can be switched smoothly.

  The fluorescent plate 101 was formed as a fluorescent wheel. The diffuse transmission region 104 is provided with a first diffusion plate 105 and a second diffusion plate 106 each having an arc shape and an annular shape. Accordingly, since the fluorescent plate 101 can be rotationally driven, the switching structure between the first diffusion plate 105 and the second diffusion plate 106 can also be formed with a simple rotational drive mechanism.

  In addition, the light source control circuit 41 irradiates the excitation light so that the emitted light emitted from the excitation light irradiation device 70 diffuses and transmits through the first diffusion plate 105 and the second diffusion plate 106 based on the set time distribution. The apparatus 70 is controlled. Thereby, since the peripheral illuminance ratio of the fluorescent light and the peripheral illuminance ratio by the light emitted from the excitation light irradiation device 70 can be matched more precisely, it is possible to obtain clear projected light with a more uncomfortable feeling.

  In addition, the setting of the time distribution of the emitted light from the excitation light irradiation device 70 that is transmitted through the first diffusion plate 105 and the second diffusion plate 106 is set according to the excitation light irradiated to the phosphor layer in the fluorescence emission region 103. It is determined corresponding to the size of the irradiation spot S. Since the size of the irradiation spot S is determined by the position of the fluorescent screen 101 with respect to the excitation light irradiation device 70, the time distribution can be set according to the mounting state of the fluorescent screen 101.

  In addition, the setting of the time distribution of the emitted light from the excitation light source transmitted through the first diffusion plate 105 and the second diffusion plate 106 is determined according to the peripheral illuminance ratio of the fluorescent light emitted from the phosphor layer. . As a result, the time distribution is determined by confirming the peripheral illuminance ratio of the fluorescent light actually displayed on the screen, so that more accurate time distribution can be determined.

  The excitation light irradiation device 70 is configured by a blue laser diode 71, and the phosphor layer in the fluorescence emission region 103 emits light in the green wavelength band. The light source device 60 includes the excitation light irradiation device 70, the fluorescent plate device 100, and the red light source device 120. Thereby, the light source device 60 provided with the three-color light source which can radiate | emit the blue wavelength band light match | combined with the peripheral illumination intensity ratio of the green wavelength band light can be obtained.

  The projection apparatus 10 includes a light source device 60, a display element 51, a projection apparatus control unit that controls the projection side optical system 220 and the display element 51. As a result, it is possible to obtain the projection apparatus 10 that can perform clear projection without any sense of incongruity by matching the peripheral illuminance ratio between the green wavelength band light and the blue wavelength band light.

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

The invention described in the first claim of the present application will be appended below.
[1] an excitation light source;
A light source control means for controlling the excitation light source so as to emit a light beam from the excitation light source at a predetermined timing;
A fluorescent light emitting region provided with a phosphor layer on which light emitted from the excitation light source is irradiated as excitation light, and a plurality of diffusion plates that diffuse and transmit the light emitted from the excitation light source and have different diffusion angles are adjacent to each other. A fluorescent plate provided with a diffusion transmission region to be formed;
A light source device comprising:
[2] The fluorescent plate is a fluorescent wheel,
The light source device according to [1], wherein the diffusion transmission region includes a plurality of diffusion plates each having an arc shape and an annular shape.
[3] The light source control means controls the excitation light source based on a set time distribution so that the emitted light from the excitation light source is diffused and transmitted through each of the diffusion plates. ] Or the light source device according to [2].
[4] The light source device according to [3], wherein the setting of the time distribution is determined in accordance with a size of an irradiation spot of excitation light irradiated on the phosphor layer.
[5] The light source device according to [3], wherein the setting of the time distribution is determined in accordance with a peripheral illuminance ratio of the fluorescent light emitted from the phosphor layer.
[6] The excitation light source includes a blue laser diode and is configured to emit blue wavelength band light, and the phosphor layer is formed to emit green wavelength band fluorescent light,
The light source device according to any one of [1] to [5], further including a red light source device configured to include a red light emitting diode and configured to emit red wavelength band light.
[7] The light source device according to any one of [1] to [6],
A display element that is irradiated with light source light from the light source device to form image light;
A projection-side optical system that projects the image light emitted from the display element onto a screen;
A projection device control means for controlling the display element and the light source device;
A projection apparatus comprising:

DESCRIPTION OF SYMBOLS 10 Projector 11 Top panel 12 Front panel 13 Back panel 14 Right panel 15 Left panel 17 Exhaust hole 18 Intake hole 19 Lens cover 21 Input / output connector part 22 Input / output interface 23 Image conversion part 24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir reception unit 36 Ir processing unit 37 Key / indicator unit 38 Control unit 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens motor 47 Audio processing unit 48 Speaker 51 Display Element 60 Light source device 70 Excitation light irradiation device 71 Blue laser diode 73 Collimator lens 75 Reflective mirror group 76 Mirror substrate 78 Condensing lens 80 Green light source device 81 Heat sink 100 Fluorescent plate device 101 Fluorescent plate 102 Base material 103 Fluorescent light emitting region 104 Diffuse transmission region 105 First diffuser plate 106 Second diffuser plate 107 Condensing lens group 110 Motor 112 Motor shaft 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 dike Ic mirror 143 first reflective mirror 145 second reflective mirror 146 condenser lens 147 condenser lens 148 second dichroic mirror 149 condenser lens 170 light source side optical system 173 condenser lens 175 light tunnel 178 condenser 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)

An excitation light source;
A light source control means for controlling the excitation light source so as to emit a light beam from the excitation light source at a predetermined timing;
A fluorescent light emitting region provided with a phosphor layer on which light emitted from the excitation light source is irradiated as excitation light, and a plurality of diffusion plates that diffuse and transmit the light emitted from the excitation light source and have different diffusion angles are adjacent to each other. A fluorescent plate provided with a diffusion transmission region to be formed;
A light source device comprising: The fluorescent plate is a fluorescent wheel;
The light source device according to claim 1, wherein the diffusion transmission region is provided with a plurality of diffusion plates each having an arc shape and an annular shape.   The said light source control means controls the said excitation light source so that the emitted light from the said excitation light source is diffusely permeate | transmitted through each said diffusion plate based on the set time distribution. 2. The light source device according to 2.   4. The light source device according to claim 3, wherein the setting of the time distribution is determined in accordance with a size of an irradiation spot of excitation light irradiated on the phosphor layer.   The light source device according to claim 3, wherein the setting of the time distribution is determined in accordance with a peripheral illuminance ratio of fluorescent light emitted from the phosphor layer. The excitation light source includes a blue laser diode and is configured to emit blue wavelength band light, and the phosphor layer is formed to emit green wavelength band fluorescent light,
The light source device according to claim 1, further comprising a red light source device configured to include a red light emitting diode and configured to emit red wavelength band light. A light source device according to any one of claims 1 to 6;
A display element that is irradiated with light source light from the light source device to form image light;
A projection-side optical system that projects the image light emitted from the display element onto a screen;
A projection device control means for controlling the display element and the light source device;
A projection apparatus comprising:

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