JP5472677B2 - Light source device and projector - Google Patents

Description

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

  2. Description of the Related Art Today, a projector as an image projection apparatus that projects 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 is widely used. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  Conventionally, projectors using a high-intensity discharge lamp as the light source have been the mainstream of such projectors, but in recent years, developments have been made to use solid-state light emitting elements such as red, green, and blue light emitting diodes and laser diodes as the light source. Has been made. Furthermore, various light source devices using phosphors that absorb light emitted from a solid-state light emitting element as excitation light and convert it into light of a predetermined wavelength range have been developed. For example, in Japanese Patent Application Laid-Open No. 2007-80880 (Patent Document 1), a plurality of LED chips as excitation sources, and different wavelengths arranged so as to correspond to the light emission range of each LED chip substantially on a one-to-one basis. There has been proposed a light source device including a phosphor layer that emits local light.

Japanese Patent Laid-Open No. 2007-80880

  The light source device described in this document synthesizes light source light from a plurality of LED chips and emission light from a phosphor layer arranged corresponding to the LED chip, or synthesizes the synthesized light in different wavelength ranges. The color and brightness can be adjusted by further combining with light, etc., but since the color and brightness are adjusted by switching or combining lighting of multiple LED chips, the color mixing ratio must be finely adjusted. There was a problem that it was not possible.

  When the color mixing ratio is finely adjusted by the light source device, it is necessary to provide a large number of LED chips and phosphor layers as light sources, which causes a problem of increasing the manufacturing cost.

  The present invention has been made in view of such problems of the prior art, and a light source device that allows a user to freely adjust the color mixture ratio and adjust the hue and brightness, and the light source device. An object of the present invention is to provide a projector provided.

The light source device according to the present invention includes a light emitting plate having at least two light emitting regions that emit light having different wavelength ranges, a light source that irradiates light to the light emitting region, and an irradiation spot of light from the light source in the light emitting region. Chromaticity changing means for changing the position of the irradiation spot and / or the shape of the irradiation spot so as to fit in each single light emitting area or straddle at least two light emitting areas. For example, a phosphor layer that receives light from the light source and emits light in a predetermined wavelength range is disposed, and the chromaticity changing unit changes the irradiation direction of the light from the light source. The spot position can be changed .

  The light source device of the present invention includes a drive source for rotating the light emitting plate, the light emitting plate is formed in a circular shape, and the light emitting plate is formed with a light emitting region adjacent to the circumferential direction and at least one of them. In some cases, auxiliary light emitting regions are formed adjacent to each other in the radial direction of the light emitting regions, and different wavelength band lights can be emitted sequentially from the light emitting regions adjacent in the circumferential direction by rotating the light emitting plate.

  In the light source device, the chromaticity changing means is arranged between the light source and the light emitting plate, and is configured as an adjusting device that changes the irradiation direction and / or the irradiation spot shape of the light from the light source. be able to.

  And it is suitable for the adjustment apparatus to be comprised so that the irradiation direction of the light from the said light source can be changed with a KTN crystal | crystallization.

  In addition, the adjusting device may be configured to change the irradiation direction of light from the light source by an acousto-optic element.

  Further, the adjusting device may be configured to change the irradiation direction of the light from the light source by a MEMS mirror.

  In addition, the adjusting device may be configured as a beam expander that can change the irradiation spot shape of the light from the light source.

  And the chromaticity changing means of the present invention is driven so as to change the position and / or angle of the lens disposed between the light source and the light emitting plate, thereby irradiating the position of the light irradiation spot from the light source. And / or it can also be configured as a lens driving device that changes the irradiation spot shape.

  The light source device of the present invention preferably employs a laser emitter that emits light having a wavelength shorter than the blue wavelength range to the light source.

  Further, in the light source device, the light emitting region includes a red light emitting region in which a phosphor layer that emits light in a red wavelength region is disposed, and a green light emitting region in which a phosphor layer that emits light in a green wavelength region is disposed. A blue light emitting region in which a phosphor layer that emits light in a blue wavelength region is disposed is preferable.

  The light source device of the present invention may employ a laser emitter that emits blue wavelength band light to the light source.

  In the light source device, the light emitting area includes a red light emitting area in which a phosphor layer emitting red wavelength band light is disposed, and a green light emitting area in which a phosphor layer emitting green wavelength band light is disposed. A blue light emitting region in which a diffusion layer for diffusing light in the blue wavelength region emitted from the light source is disposed.

  The projector of the present invention includes a light source device, a display element, a cooling fan, a light source side optical system that guides light from the light source device to the display element, and an image emitted from the display element. And a projector control means for controlling the light source device and the display element, and the light source device is any one of the light source devices described above.

  According to the present invention, it is possible to provide a light source device that allows a user to freely adjust the color mixture ratio and adjust color and brightness, and a projector including the light source device.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. It is a figure which shows the functional circuit block of the projector which concerns on the Example of this invention. 1 is a schematic plan view showing an internal structure of a projector according to an embodiment of the invention. It is the plane schematic diagram and front schematic diagram of the light source device which concern on the Example of this invention. It is a schematic diagram which shows the irradiation spot of the light from the light source produced | generated on the light-emitting plate of the light source device which concerns on the Example of this invention. FIG. 6 is a spectral distribution diagram of monochromatic light emitted from a red light emitting region and mixed color combined light from red and green light emitting regions of a light source device according to an embodiment of the present invention. It is a chromaticity diagram showing chromaticity coordinates of each color light emitted from each light emitting region of the light source device according to the embodiment of the present invention. It is a schematic diagram which shows the light-emitting plate of the light source device which concerns on the Example of this invention. It is the front schematic diagram and side schematic diagram of the light source device which concern on the modification of this invention.

  A mode for carrying out the present invention will be described. The projector 10 includes a light source device 63, a display element 51, a cooling fan, a light source side optical system 62 that guides light from the light source device 63 to the display element 51, and an image emitted from the display element 51 on a screen. A projection-side optical system 90 for projecting and projector control means for controlling the light source device 63 and the display element 51 are provided.

  The light source device 63 can emit red wavelength band light, green wavelength band light, and blue wavelength band light sequentially by the chromaticity changing means, and is different from the red light in red wavelength band light. The position of the irradiation spot 133 is changed by changing the irradiation direction of the light from the light source 72 so that the green and blue wavelength band lights are synthesized and emitted.

  The light source device 63 includes a light-emitting plate 130 having three light-emitting regions 132 for emitting red, green, and blue light, and an ultraviolet region having a shorter wavelength than light in the red, green, and blue wavelength regions. A laser emitter that is a light source 72 that emits light in the wavelength band (ultraviolet light), and an irradiation spot 133 of light from the light source 72 in the light emitting region 132 extends over the red and green light emitting regions 132R and 132G, and green and blue Chromaticity changing means for changing the irradiation direction so as to straddle the light emitting regions 132G and 132B.

  Each light emitting region 132 of the light emitting plate 130 is provided with a phosphor layer 131 that receives light from the light source 72 and emits light in a predetermined wavelength region. Specifically, the red light emitting region 132R has a light emitting region 132R. Has a red phosphor layer 131R that emits light in the red wavelength region, a green phosphor layer 131G that emits light in the green wavelength region is disposed in the green light emitting region 132G, and a blue phosphor layer in the blue light emitting region 132B. A layer 131B of blue phosphor that emits light in the wavelength region is disposed.

  The chromaticity changing means is arranged between the light source 72 and the light emitting plate 130, and is configured as an adjusting device 150 that changes the irradiation direction of light from the light source 72 by a KTN crystal.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of the projector 10. In this embodiment, left and right indicate the left and right direction with respect to the projection direction, and front and rear indicate the front and rear direction with respect to the traveling direction of the light beam. As shown in FIG. 1, the projector 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 main body case. 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.

  In addition, a key / indicator unit 37 is provided on the top panel 11 which is a main body case. The key / indicator unit 37 includes a power switch key, a power indicator for notifying power on / off, and projection on / off. There are arranged keys and indicators such as a projection switch key for switching, an overheat indicator for notifying when a light source device, a display element, a control circuit or the like is overheated.

  In addition, on the back side of the main body case, there are provided various terminals 20 such as an input / output connector section and a power adapter plug for providing a USB terminal, a D-SUB terminal for image signal input, an S terminal, an RCA terminal, etc. on the rear panel. Yes. A plurality of intake holes 18 are formed in the vicinity of the lower portion of the right side panel 14 which is a side plate of the main body case (not shown) and the left side panel 15 which is the side plate shown in FIG.

  Next, projector control means of the projector 10 will be described with reference to the block diagram of FIG. The projector 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. Image signals of various standards input from the input / output connector unit 21 are input / output. The image conversion unit 23 converts the image signal into a predetermined format suitable for display via the interface 22 and the system bus (SB), and outputs the image signal 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 driver 26.

  The display driving unit 26 drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24, and is emitted from the light source device 63. A light beam is incident on the display element 51 via the light source side optical system, thereby forming an optical image with the reflected light of the display element 51, and an image is displayed on a screen (not shown) via a projection system lens group serving as a projection side optical system. Is projected and displayed. The movable lens group 97 of the 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 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 coding, and are sequentially written in a memory card 32 which is a detachable recording medium. Further, the image compression / decompression unit 31 reads out the image data recorded on the memory card 32 in the reproduction mode, decompresses individual image data constituting a series of moving images in units of one frame, and converts the image data into the image conversion unit 23. Is output to the display encoder 24 and the processing for enabling the display of a moving image or the like based on the image data stored in the memory card 32 is performed.

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

  An operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the upper panel 11 of the main body case is directly sent to the control unit 38, and a key operation signal from the remote controller is sent to the Ir receiving unit 35. , And the code signal demodulated by the Ir processor 36 is output to the controller 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.

  The control unit 38 controls the light source control circuit 41. When the power switch key is operated, the light source control circuit 41 turns on the light source 72 of the light source device 63 and then controls blinking. The control unit 38 causes the adjustment device control circuit 42 to variably control the direction of the light beam from the light source 72 based on the user operation setting. 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 63 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 keep the cooling fan rotating even after the projector body is turned off by a timer or the like, and further turns off the projector body depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Next, the internal structure of the projector 10 will be described. FIG. 3 is a schematic plan view showing the internal structure of the projector 10. As shown in FIG. 3, the projector 10 has a power supply control circuit board 102 with a power supply circuit block 101 and the like attached in the vicinity of the right panel 14, and a sirocco fan type blower 110 arranged in the approximate center. A control circuit board 103 is disposed near 110, a light source device 63 is disposed near the front panel 12, and an optical system unit 70 is disposed near the left panel 15. Further, the projector 10 is airtightly divided into an intake side space chamber 121 on the rear panel 13 side and an exhaust side space chamber 122 on the front panel 12 side by a partition wall 120 in the housing, and the blower 110 has a suction port 111 is disposed in the intake side space chamber 121 and the discharge port 113 is positioned at the boundary between the exhaust side space chamber 122 and the intake side space chamber 121.

  The optical system unit 70 includes an illumination side block 78 located in the vicinity of the light source device 63, an image generation block 79 located on the back panel 13 side, and a projection side block located between the illumination side block 78 and the left panel 15. It is a substantially U-shape composed of 80 and 3 blocks.

  The illumination side block 78 includes a part of the light source side optical system 62 that guides the light emitted from the light source device 63 to the display element 51 provided in the image generation block 79. As the light source side optical system 62 included in the illumination side block 78, the light guide device 75 that converts the light beam emitted from the light source device 63 into a light beam having a uniform intensity distribution, and condenses light transmitted through the light guide device 75. There is a condensing lens.

  The image generation block 79 includes, as the light source side optical system 62, an optical axis changing mirror 74 that changes the optical axis direction of the light beam emitted from the light guide device 75, and light reflected by the optical axis changing mirror 74 as a display element. A plurality of condensing lenses for condensing on 51 and an irradiation mirror 84 for irradiating the display element 51 with a light beam transmitted through these condensing lenses at a predetermined angle. Further, the image generation block 79 includes a DMD serving as a display element 51, and a display element cooling device 53 for cooling the display element 51 is disposed on the rear panel 13 side of the display element 51. Prevents high temperatures.

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

  Further, in the internal structure of the projector 10, members having a temperature lower than that of the light source device 63 are arranged in the intake side space chamber 121. Specifically, the power supply control circuit board 102 and the blower 110 are arranged. A control circuit board 103, an image generation block 79 of the optical system unit 70, a projection side block 80 of the optical system unit 70, and a condenser lens in the illumination side block 78 of the optical system unit 70. .

  On the other hand, in the exhaust-side space chamber 122, a light source device 63 that has a relatively high temperature, a light guide device 75 provided in the illumination-side block 78 of the optical system unit 70, and an exhaust temperature reducing device 114 are arranged.

  In the light source device 63 according to the present invention, the control unit 38 causes the adjustment device control circuit 42 to control the adjustment device 150 to scan the light source bundle from the light source 72. Wavelength band light and blue wavelength band light can be emitted sequentially.

  In addition, the light source device 63 condenses the reflected mirror 140 as an optical axis conversion device that converts the optical axis of the light beam emitted from the light source device 63 and the emitted light emitted from the light emitting plate 130 in all directions. A condensing optical system comprising a lens group 148, a convex lens 163, and a light guide device incident lens 164 that condenses the light bundle on the incident surface of the light guide device 75, and is a light emission that is a generation unit of each color light The light emitted from the plate 130 is arranged so as to be condensed and guided to the light guide device 75.

  That is, by configuring the condensing optical system in this way, each color light emitted from the light source device 63 is condensed by the lens group 148 and irradiated to the convex lens 163, and the light condensed by the convex lens 163 is reflected. After being reflected by the mirror 140, the light is condensed on the incident surface of the light guide device 75 by the light guide device incident lens 164.

  Next, the light source 72, the light emitting plate 130, and the adjusting device 150 of the light source device 63 will be described with reference to FIG. FIGS. 4A and 4B are a schematic plan view and a schematic front view of the light source device 63 according to the embodiment of the present invention. The light source device 63 includes a light emitting plate 130 having three light emitting regions 132 that emit red, green, and blue light, a light source 72 that emits light to the light emitting regions 132, and irradiation of light from the light source 72 in each light emitting region 132. And an adjustment device 150 as chromaticity changing means for changing the position of the irradiation spot so that the spot fits in the single light emitting area 132 of the light emitting plate 130 or straddles the two light emitting areas 132.

  The light source 72 is a wavelength region light (ultraviolet light) in an ultraviolet region having a shorter wavelength than red, green, and blue wavelength region light generated from a phosphor layer 131 disposed in each light emitting region 132 of the light emitting plate 130 described later. This is a laser emitter that emits light. In this way, by using high-energy light having a shorter wavelength than the light emitted from the phosphor layer 131 disposed in each light-emitting region 132 as the excitation light of the phosphor, the phosphor is efficiently excited and each color is Emitted light can be generated.

  In addition, if a laser emitter is used for the light source 72 in this way, it is possible to irradiate the phosphor layer of each light source device 63 with directional high-power light, so that the phosphor can be efficiently excited. Light of each color can be generated. The light source 72 is not limited to one that emits light in the wavelength region of the ultraviolet region, but may be one that emits purple wavelength region light that is visible light. A light emitting diode may be used instead of the laser light emitter. Furthermore, a plurality of types of light sources 72 may be arranged and used by switching according to the situation.

  By adopting a light emitting diode or laser light emitter as the light source 72, power consumption can be suppressed and downsizing can be achieved as compared with a projector using a conventional discharge lamp or the like as a light source device.

  In addition, a collimator lens 142 is provided on the emission surface side of the light source 72 to emit light with higher directivity of light from the laser emitter, or to direct light from the light emitting diode with directivity. This is preferable because the efficiency of use of the light emitted from the light source 72 can be improved.

  The light emitting plate 130 is formed with three light emitting regions 132 that are regions where light from the light source 72 is irradiated onto a transparent base material made of light-transmitting glass or resin. In the light emitting region 132, a phosphor layer 131 that emits light in a predetermined wavelength band when excited by receiving and absorbing light from the light source 72 is disposed. Specifically, a red phosphor layer 131R is disposed in a red light emitting region 132R formed at one end of the light emitting plate 130, and a blue phosphor region 132B formed at the other end of the light emitting plate 130 is disposed in a blue phosphor region. The layer 131B is disposed, and the green phosphor layer 131G is disposed in the green light emitting region 132G formed between the red light emitting region 132R and the blue light emitting region 132B.

  The phosphor layer 131 is composed of a phosphor crystal and a binder, and the phosphor contained in the phosphor layer 131 is excited by absorbing excitation light that is light source light, so that it can be omnidirectional. It is possible to emit light in a predetermined wavelength range.

  Therefore, when the light from the light source 72 is irradiated onto the phosphor layer 131 of the light emitting plate 130, the phosphor of the phosphor layer 131 absorbs the light and emits light in a predetermined wavelength range in all directions. That is, when the light source light is irradiated so that the irradiation spot of the light source light is positioned on the red light emitting region 132R, red wavelength band light is emitted from the phosphor of the red phosphor layer 131R, and similarly, the green light emitting region 132G is emitted. When the light source light is irradiated, green wavelength region light is emitted from the green phosphor layer 131, and when the blue light emitting region 132B is irradiated with the source light, blue wavelength region light is emitted from the blue phosphor layer 131. The

  Then, the light emitted from the phosphor layer 131 to the lens group 148 side enters the light guide device 75 as it is through the condensing optical system.

  Here, the dichroic that transmits the light source light to the entire surface of the light emitting plate 130 on the side where each phosphor layer 131 is disposed and reflects light in a wavelength region other than the light source light such as the wavelength region light emitted from the phosphor. If the layer is formed, the light from the light source 72 can pass through the dichroic layer and irradiate the phosphor layer 131, and the light emitted from the phosphor layer 131 to the transparent substrate side of the light-emitting plate 130 The amount of light that is reflected toward the light guide device 75 and incident on the light guide device 75 can be increased.

  Further, if a non-reflective coating layer is formed on the entire surface of the light-emitting plate 130 opposite to the side where the phosphor layer 131 is disposed, the light from the light source 72 is transmitted to the light source 72 side almost without being reflected. Since the light can be incident on the body layer 131, the utilization efficiency of the light emitted from the light source 72 can be improved.

  The adjusting device 150 as the chromaticity changing means of the present invention is disposed between the light source 72 and the light emitting plate 130, and changes the irradiation direction of the light from the light source 72 to irradiate the light emitting region 132 of the light emitting plate 130. The spot position can be changed.

  Various optical devices can be employed for the adjusting device 150. For example, the adjusting device 150 may be an optical deflector including a MEMS (micro electro mechanical system) mirror that can individually control the angles of a large number of fine mirrors by an electric signal.

  In this adjustment device 150, the control unit 38 sends a predetermined electrical signal to the adjustment device control circuit 42, and the adjustment device control circuit 42 controls the angle of the mirror to change, so that the irradiation direction of the light source light is changed. The position of the irradiation spot of the light source light incident on the light emitting plate 130 can be changed continuously. That is, each color light can be sequentially emitted by repeatedly scanning the three light emitting regions 132 by changing the mirror angle continuously.

  Further, if the control unit 38 can control the blinking of the light source 72 by the light source control circuit, the light source 72 is turned on only when the irradiation spot is positioned so as to fall within each single light emitting region 132 together with the operation of the mirror. Thus, the position of the irradiation spot can be changed discontinuously, and only red, green, and blue monochromatic light can be incident on the display element 51 via the optical system.

  Since the adjustment device 150 is configured as an optical polarizer including a MEMS mirror in this way, the scanning angle of the light source light can be widened, and therefore each color light can be easily generated with the large light emitting plate 130. Can do.

  Next, change control of the position of the light irradiation spot 133 from the light source 72 in the light emitting region 132 will be described in detail with reference to FIG. FIG. 5 is a schematic diagram showing an irradiation spot 133 of light from the light source 72 generated on the light emitting plate 130 of the light source device 63 according to the embodiment of the present invention.

  As described above, the control unit 38 controls the light source 72 and the adjustment device 150 so that red, green, and blue wavelength band lights are sequentially emitted from the light source device 63 to the light source control circuit 41 and the adjustment device control circuit 42. I am letting. That is, as shown in FIG. 5A, the light source 72 is placed with the MEMS mirror of the adjustment device 150 tilted at a predetermined angle so that the entire irradiation spot 133 of the light source light is located in the red light emitting region 132R. When the light is turned on, the light source light is applied to the phosphor of the red phosphor layer 131R, and the phosphor is excited to emit red monochromatic wavelength band light from the light emitting plate. Similarly, when the control unit 38 controls the light source 72 and the adjusting device 150 by the light source control circuit 41 and the adjusting device control circuit 42 so that the entire irradiation spot 133 is positioned in the green light emitting region 132G, green monochromatic light is emitted. If all of the irradiation spot 133 is positioned in the blue light emitting region 132B, blue monochromatic light is emitted.

  Therefore, the control unit 38 scans the light beam by the adjusting device control circuit 42 to sequentially position the irradiation spot 133 in each light emitting region 132, and the light source control circuit 41 allows the light source control circuit 41 to sequentially emit each color light source. By controlling 72 to blink in a time-sharing manner, red, green, and blue monochromatic wavelength band lights are sequentially incident on the light guide device 75, and the light bundle incident on the light guide device 75 is displayed on the display element 51 by the light source side optical system 62. It will be guided to. As a result, the display element 51 performs time-division display of the light of each color according to the data in accordance with the irradiation timing of each color light, so that a color image can be generated on the screen via the projection-side optical system 90.

  Then, the control unit 38 sets the irradiation spot 133 so as to straddle the two light emitting regions 132 according to the user's operation setting, for example, in the red light emitting region 132R and the green light emitting region 132G as shown in FIG. The adjusting device 150 is configured to be controlled by the adjusting device control circuit 42 so as to straddle.

  Therefore, not only the red, green, and blue monochromatic wavelength range light is sequentially emitted, but also, for example, the light source device 63 sequentially emits the mixed color composite light of red and green and the green and blue monochromatic wavelength range light. The redness of the projected image from the projector 10 can be weakened to enhance the green color. That is, according to the present invention, it is possible to provide the light source device 63 capable of adjusting the hue and brightness and the projector 10 including the light source device 63.

  Specifically, with reference to FIGS. 6 and 7, chromaticity, luminance, and the like when the color mixture ratio of red and green is 9: 1 will be described below. FIG. 6 shows a spectral curve of monochromatic light emitted from the red light emitting region 132R of the light source device 63 according to the embodiment of the present invention as a broken line, and a spectral curve of mixed color combined light from the red and green light emitting regions 132R and 132G as a solid line. It is the shown spectral distribution map. FIG. 7 is a chromaticity diagram showing chromaticity coordinates of each color light emitted from each light emitting region 132 of the light source device 63 according to the embodiment of the present invention. In FIG. 7, the broken line is a line connecting chromaticity coordinates in the case of emitting red, green, and blue monochromatic wavelength bands light, and the thin solid line is the mixed color composite light of red and green, and the monochromatic wavelength areas of green and blue A line connecting the chromaticity coordinates when light is emitted, and a thick solid line is a line indicating a boundary of the chromaticity diagram.

  As shown in FIG. 6, the mixed color composite light (solid line) synthesized with a red / green color mixture ratio of 9: 1 has a slightly reduced ratio of the red wavelength range compared to the monochromatic emission light (dashed line). Ingredients are being generated. That is, the luminance can be improved by mixing the green wavelength band component with the red light. At this time, as shown in FIG. 7, the red light has a single color emission light (dashed line), and the chromaticity coordinates of the red light are combined light (solid line) in which the red light is mixed with the green light. The chromaticity coordinates of the mixed light of green and green are displaced in the green direction. That is, by emitting light in which red and green are mixed instead of red monochromatic light, brightness is improved instead of reducing color reproducibility.

  Thereby, it is possible to project an image with high brightness that is most suitable for the projector 10 used in business or the like onto the screen.

  Further, the present invention is not limited to the case where green light is combined with red light, and the luminance may be improved by combining green light with blue light. And the arrangement configuration of each light emission area | region 132 is not limited to the case where three are arranged in parallel, A various arrangement configuration is employable. Moreover, it is not limited to using a rectangular base material.

  For example, as shown in FIGS. 8A and 8B, each light emitting region 132 is provided so that a boundary point of three light emitting regions 132 is formed on a rectangular and circular light emitting plate 130. Also good. As a result, the irradiation spot 133 can be positioned at the boundary point of the red, green, and blue light emitting regions 132, and white light that combines the respective colors can be generated. Alternatively, red and green can be mixed to generate complementary yellow, red and blue can be mixed to generate complementary magenta, and green and blue can be mixed to generate complementary cyan. That is, the color tone can be easily adjusted by sequentially making light of various wavelength bands incident on the light guide device 75.

  In addition, four or more light emitting regions 132 of the light emitting plate 130 may be formed, and the phosphor layer 131 disposed in the light emitting region 132 is provided with the phosphor layer 131 capable of generating the three primary colors of light. Without being limited thereto, a phosphor layer 131 that can emit light in various wavelength ranges such as yellow and cyan can also be disposed.

  Therefore, according to the present invention, it is possible to provide the light source device 63 in which the user can freely adjust the color mixture ratio and adjust the hue and brightness, and the projector 10 including the light source device 63.

  And this invention is not limited to the above Example, A change and improvement are possible freely in the range which does not deviate from the summary of invention. For example, the adjusting device 150 is not limited to being configured as an optical polarizer including a MEMS mirror, but can also be configured as an acousto-optic deflector that utilizes the acousto-optic effect of the acousto-optic element.

  That is, the adjustment device 150 includes an acoustooptic medium made of single crystal or glass such as tellurium dioxide (TeO2) or lead molybdate (PbMoO4), and a piezoelectric element bonded to the medium, and the control unit 38 adjusts the adjustment device 150. An ultrasonic wave is generated by sending a predetermined electric signal to the piezoelectric element by the device control circuit 42, and the traveling direction of the light source light is diffracted by diffracting the light by the periodic fluctuation of the refractive index generated in the medium by the ultrasonic wave. It is configured to be changeable.

  This makes it possible to reliably prevent color separation due to the color breaking phenomenon by changing the irradiation direction 133 by changing the irradiation direction at a higher speed than the optical deflector using the MEMS mirror, which is more suitable for the projector 10. A light source device 63 can be provided.

  Further, the adjusting device 150 can be configured as an optical deflector that utilizes an optical deflection phenomenon caused by a KTN (potassium niobate tantalate) crystal.

  In the adjusting device 150, the control unit 38 causes the adjusting device control circuit 42 to perform control to change the voltage applied to the KTN crystal in a time-sharing manner, thereby bending the light source light without causing the light source 72 to blink, thereby irradiating the irradiation spot 133. Can be changed in a time-sharing manner. By adopting this adjustment device 150, it becomes possible to perform light deflection that changes the irradiation direction and changes the position of the irradiation spot 133 at a speed equal to or higher than that of an optical polarizer using an acousto-optic device. The light source light can be deflected at the same scanning angle. Further, since the adjustment device 150 can be simple and has a small structure, the projector 10 can be reduced in size and thickness. Further, since the power consumption is small, the power consumption of the projector 10 can be reduced.

  The chromaticity changing means is not limited to being configured as the adjusting device 150, and various configurations can be employed. For example, the chromaticity changing means changes the position of the collimator lens 142 (see FIG. 4A) disposed between the light source 72 and the light emitting plate 130 in a direction perpendicular to the optical axis of the light source 72. And / or it can be configured as a lens driving device that changes the irradiation direction of the light from the light source 72 to change the position of the irradiation spot 133 by driving the collimator lens 142 to change the angle.

  The chromaticity changing means can also be configured as a light source driving device that moves the light source 72 in a direction parallel to the surface of the light emitting plate 130 (a direction perpendicular to the optical axis of the light source light). That is, the position of the irradiation spot 133 in the light emitting region 132 can be changed by changing the position of the light source 72 by the light source driving device.

  Further, when the light source device 63 includes the collimator lens 142, the collimator lens 142 is moved along with the movement of the light source 72. The position of the irradiation spot 133 can also be changed by changing the angle of the light source 72, that is, the irradiation direction by the light source driving device. In this case, the collimator lens 142 is integrated with the light source 72 by a holding member or the like. For example, the position and angle of the collimator lens 142 are changed together with the angle of the light source 72 by holding them. The light source 72 may change the position of the irradiation spot 133 by simultaneously changing the angle and the position.

  Further, the chromaticity changing means fixes the light source 72 instead of operating the light source 72 as described above, and moves the light emitting plate 130 in a direction perpendicular to the optical axis of the light from the light source 72. And / or a light-emitting plate driving device that changes the position of the irradiation spot 133 of the light from the light source 72 on the light-emitting plate 130 by changing the angle of the light-emitting plate 130.

  Furthermore, the chromaticity changing means not only changes the position of the irradiation spot 133 but also changes the shape of the irradiation spot 133, so that the irradiation spot 133 of the light from the light source 72 becomes a single light emitting region 132 one by one. Or may extend over at least two light emitting regions.

  As the chromaticity changing means for changing the shape of the irradiation spot 133, it is preferable to provide a predetermined adjusting device 150 or drive each optical component so as to change the size of the irradiation spot 133. For example, if a beam expander is used as the adjusting device 150 that arranges the chromaticity changing means between the light source 72 and the light emitting plate 130, the light source light can be moved by moving a concave lens, a convex lens, or the like built in the adjusting device 150. The light beam can be expanded or reduced, so that the spot diameter of the irradiation spot 133 of the light source light can be reduced to fit the irradiation spot 133 in the single light emitting region 132, or the irradiation spot can be increased by increasing the spot diameter. By extending 133 over two or more light emitting regions 132, it is possible to generate monochromatic light or mixed color light.

  Then, when the projector 10 is equipped with the light source device 63 provided with the chromaticity changing means for changing the shape of the irradiation spot 133, the three light sources 72 for irradiating the single light emitting plate 130 are provided. By sequentially flashing each light source 72, the irradiation spot 133 is sequentially positioned so that it can be contained in a single light emitting area 132 or straddle two light emitting areas 132, thereby generating a color image with adjustable hue on the screen. can do. In addition, chromaticity changing means capable of changing the position of the irradiation spot 133 without providing a plurality of light sources 72 is provided together with chromaticity changing means capable of changing the shape of the irradiation spot 133, and each color light is sequentially emitted in the same manner. The light source device 63 may be used.

  Further, the chromaticity changing means capable of changing the shape of the irradiation spot 133 does not arrange the adjusting device 150, and the position of the collimator lens 142 arranged between the light source 72 and the light emitting plate 130 is changed to the optical axis of the light source light The size of the irradiation spot 133 of the light source light can be changed by being configured as a lens driving device that is driven to change in the direction.

  Further, the chromaticity changing means can change the size of the irradiation spot 133 by being configured as a light source driving device that drives the position of the light source 72 to change in the optical axis direction of the light source light.

  The chromaticity changing means can also change the size of the irradiation spot 133 by configuring it as a light emitting plate driving device that drives the light emitting plate 130 so as to change the position of the light emitting plate 130 in the optical axis direction of the light from the light source 72. it can.

  The chromaticity changing means is not limited to the case where the size (spot diameter) of the irradiation spot 133 is changed as described above, and the angles of the light source 72 and the light emitting plate 130 are slightly inclined. Then, the shape of the irradiation spot 133 can be an ellipse, and the irradiation spot 133 can be positioned so as to straddle the two light emitting regions 132. Of course, changing the position of the irradiation spot 133 and changing the shape of the irradiation spot 133 may be combined.

  As described above, the chromaticity changing means can adopt various configurations, but in any case, the user can freely adjust the color mixture ratio and adjust the hue and brightness. The light source device 63 that can be provided and the projector 10 including the light source device 63 can be provided.

  In each of the above-described embodiments, the light source device 63 sequentially emits the light source light to the light emitting regions 132 formed on the light emitting plate 130 in order to emit red, green, and blue light from the light emitting plate 130, respectively. However, the present invention is not limited to this, and the light source device 63 that sequentially emits each color light by moving the light emitting plate 130 at a high speed can be used.

  Hereinafter, a modification of the present invention in which the light emitting plate 130 is operated at high speed will be described with reference to FIG. As shown in FIG. 9, the light source device 63 includes a light emitting plate 130 having a circular shape and a wheel motor as a drive source for rotating the light emitting plate 130. In this wheel motor, a rotor is inserted into a circular opening provided in a central portion of the light emitting plate 130, and the light emitting plate 130 is bonded and fixed to a disk-shaped motor hub provided in the rotor, whereby the light emitting plate 130 is attached to the rotor. It is fixed. Accordingly, the light emitting plate 130 can be rotated at a rotational speed of about 120 times per second.

  The light-emitting plate 130 is formed with strip-shaped red, green, and blue light-emitting regions 132 that are adjacent to each other in the circumferential direction, and is also strip-shaped green auxiliary light-emitting so as to be adjacent to the inner side of the red light-emitting region 132R. Region 134G is formed.

  Therefore, when the wheel motor is driven in a state where the light source light from the light source 72 is applied to the light emitting region 132, the light emitting plate 130 rotates and red, green, and blue wavelength region lights sequentially from the light emitting regions 132 adjacent in the circumferential direction. It will be injected.

  As described above, since each color emission light is emitted corresponding to the rotation of the light emitting plate 130 driven by the wheel motor, it is possible to easily perform time-division switching of each color of the emission light. Further, it is possible to easily synchronize the rotational drive of the light emitting plate 130 and the display element 51 with respect to the emission of each color. Furthermore, since the irradiation position of the light source light is expanded in the circumferential direction with respect to the phosphor in the light emitting region 132 by the rotation of the light emitting plate 130, the temperature rise of the phosphor can be suppressed and the light emission efficiency can be prevented from being lowered. it can.

  The light source device 63 is configured to change the position of the irradiation spot 133 in the radial direction of the light emitting plate 130 so that the chromaticity changing means extends over the light emitting region 132 and the auxiliary light emitting region 134. That is, when the light source device 63 synthesizes green light during the emission of red light, the irradiation spot 133 is used only when the irradiation spot 133 is positioned in the red light emitting region 132R by the chromaticity changing means as shown in the figure. Is moved inwardly, a part of the irradiation spot 133 can be arranged in the green auxiliary light emitting region 134G.

  Thereby, the amount of change in the position of the irradiation spot 133 can be reduced as compared with the above-described embodiment in which the irradiation spot 133 is sequentially positioned in each light emitting region 132 by the chromaticity changing means. Further, not only when the irradiation spot 133 is positioned in the red light emitting region 132R, the chromaticity changing means may be operated so that the position of the irradiation spot 133 is positioned inward in the diameter in advance. In this case, for example, the combined width of the auxiliary light emitting region 134 and the light emitting region 132 adjacent to the auxiliary light emitting region 134 so that the width of the light emitting region 132 not to be mixed is wider than the width of the light emitting region 132 to be mixed. Since the irradiation spot 133 position can be changed in advance without being affected by the operation speed of the chromaticity changing means, an adjustment device or the like capable of high-speed operation is used. There is no need.

  Also, by changing the shape without changing the position of the irradiation spot 133 in the radial direction of the light emitting plate 130, the irradiation spot 133 can be accommodated in the single light emitting region 132 or two light emitting regions as described above. It can be positioned to straddle 132.

  In the light source device 63 of the present invention, instead of the blue phosphor layer 131B disposed in the blue light emitting region 132B of the light emitting plate 130, a diffusion layer that diffuses the wavelength band light emitted from the light source 72 may be disposed. it can. This diffusion layer can be formed by fixing a solid material which is an optical material, or by subjecting the surface of the light emitting plate 130 to an optical process such as a roughing process such as blasting.

  In this case, the light source 72 is a laser light emitting device or light emitting diode that emits light in the blue wavelength range, so that the directional blue light source light can be diffused and used. The amount of use of the body can be reduced, and the inexpensive light source device 63 and the projector 10 including the light source device 63 can be provided.

  The light emitting plate 130 has a configuration in which the phosphor layer 131 is disposed on a transparent base material. However, an opaque base material such as copper or aluminum having high thermal conductivity may be used without using a transparent base material. is there. In this case, the light source 72 is disposed on the emission surface side of the light source device 63. Then, if a reflective layer is formed by silver vapor deposition or the like on the surface of the light emitting plate 130 on which the phosphor layer 131 is attached, the light emitted from the phosphor layer 131 to the opaque base material side of the light emitting plate 130 is reflected by the reflective layer. It is preferable because it can be reflected and emitted to the light guide device 75 side.

  Thus, if the phosphor layer 131 is irradiated with light from the light source 72, the emitted light from the phosphor layer 131 can be incident on the light guide device 75 via a predetermined optical system. Similar to the embodiment, it is possible to generate a color image whose hue is adjusted on the screen.

  Although the light source device 63 of the above embodiment is incorporated in the projector 10, the light source device 63 is not limited to being mounted on the projector 10, but can be mounted on various devices such as an exposure apparatus. And this light source device 63 is not limited to using red, green and blue in combination, but the light source device 63 that emits two colors and a mixed color of two colors by forming only two light emitting regions, A light source device 63 using a phosphor layer 131 capable of emitting light of a complementary color wavelength range may be incorporated in a lighting device and used as a ceiling lighting device, an illumination lighting device, a spotlight lighting device, or a car headlight. Furthermore, it can also be mounted and used in various illumination devices and display devices such as an illumination device as a surface light source and an illumination device as a backlight of a liquid crystal panel.

10 Projector 11 Top panel
12 Front panel 13 Back panel
14 Right panel 15 Left panel
17 Exhaust hole 18 Intake hole
19 Lens cover 20 Various terminals
21 I / O connector 22 I / O interface
23 Image converter 24 Display encoder
25 Video RAM 26 Display driver
31 Image compression / decompression unit 32 Memory card
35 Ir receiver 36 Ir processor
37 Key / Indicator section 38 Control section
41 Light source control circuit 42 Adjustment device control circuit
43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 51 Display element
53 Display element cooling device 62 Light source side optical system
63 Light source device 70 Optical system unit
72 Light source 74 Optical axis change mirror
75 Light guide device 78 Illumination side block
79 Image generation block 80 Projection side block
84 Irradiation mirror 90 Projection side optical system
93 Fixed lens group 97 Movable lens group
101 Power circuit block 102 Power control circuit board
103 Control circuit board 110 Blower
111 Suction port 113 Discharge port
114 Exhaust temperature reduction device 120 Partition wall
121 Inlet side space 122 Exhaust side space
130 Emitter 131 Phosphor layer
131R red phosphor layer 131G green phosphor layer
131B Blue phosphor layer 132 Light emitting region
132R Red light emitting area 132G Green light emitting area
132B Blue light emitting area 133 Irradiation spot
134 Auxiliary flash area 134G Green auxiliary flash area
140 Reflection mirror 142 Collimator lens
148 Lens group 150 Adjustment device
163 Convex lens 164 Light guide device entrance lens

Claims (13)

A light emitting plate having at least two light emitting regions each emitting light having different wavelength ranges;
A light source for irradiating the light emitting region with light;
Chromaticity that changes the position of the irradiation spot and / or the shape of the irradiation spot so that the irradiation spot of the light from the light source in the light emitting area is contained in each single light emitting area or straddles at least two light emitting areas. Changing means, and
At least one of the light emitting regions is provided with a phosphor layer that receives light from the light source and emits light in a predetermined wavelength range ,
The light source device according to claim 1, wherein the chromaticity changing means is capable of changing a position of the irradiation spot by changing an irradiation direction of light from the light source. A driving source for rotating the light emitting plate;
The light emitting plate is formed in a circular shape, the light emitting plate is formed with a light emitting region adjacent to the circumferential direction and an auxiliary light emitting region is formed adjacent to the radial direction of at least one light emitting region,
2. The light source device according to claim 1, wherein light of different wavelength ranges can be sequentially emitted from the light emitting regions adjacent in the circumferential direction by rotating the light emitting plate. Claims the chromaticity change means, wherein disposed between the light source and the light emitting plate, characterized in that it is configured as an adjusting device for varying the irradiation direction and / or irradiation spot shape of the light from the light source Item 3. A light source device according to item 1 or 2 . The light source device according to claim 3 , wherein the adjustment device is configured to be able to change a light irradiation direction from the light source by a KTN crystal. The light source device according to claim 3 , wherein the adjustment device is configured to change an irradiation direction of light from the light source by an acoustooptic device. The light source device according to claim 3 , wherein the adjustment device is configured to be able to change an irradiation direction of light from the light source by a MEMS mirror. The light source device according to claim 3 , wherein the adjustment device is configured as a beam expander that can change an irradiation spot shape of light from the light source. The chromaticity changing means is driven to change the position and / or angle of a lens disposed between the light source and the light-emitting plate, whereby the position and / or irradiation of the irradiation spot of the light from the light source. The light source device according to claim 1 , wherein the light source device is configured as a lens driving device that changes a spot shape. The light source device according to any one of claims 1 to 8 , wherein the light source is a laser emitter that emits light in a wavelength range shorter than a blue wavelength range. The light emitting region includes a red light emitting region in which a phosphor layer emitting red wavelength band light is disposed, a green light emitting region in which a phosphor layer emitting green wavelength region light is disposed, and a blue wavelength region light. The light source device according to claim 9 , wherein the light emitting device is a blue light emitting region in which a phosphor layer emitting light is disposed. Wherein the light source, the light source apparatus according to any one of claims 1 to 8, characterized in that a laser emitter which emits blue wavelength area. The light emitting area is emitted from the light source, a red light emitting area in which a phosphor layer emitting red wavelength band light is disposed, a green light emitting area in which a phosphor layer emitting green wavelength band light is disposed, and the light source. The light source device according to claim 11 , wherein the light source device is a blue light emitting region in which a diffusion layer for diffusing light in a blue wavelength region is disposed. A light source device, a display element, a cooling fan, a light source side optical system that guides light from the light source device to the display element, and a projection side optical system that projects an image emitted from the display element onto a screen; A projector control means for controlling the light source device and the display element,
Projector, wherein the light source device is a light source device according to any one of claims 1 to 12.

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