JP2014002416A - Control method of light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device that can enhance luminance, and to provide a projector including the light source device.SOLUTION: A projector according to the present invention includes a light source device, a display element, projector control means and the like. The light source device is configured to comprise: a fluorescence wheel 71 that has fluorescence emitting parts 1B and 1G, in which a fluorescent body layer 131 is formed on a rotation controllable base material that emits a green color and a blue color by reception of excitation light; a first light source that irradiates a fluorescent body of the fluorescent body layer 131 with excitation light of an ultraviolet region; a second light source that emits a red color; a condensing optical system that condenses light from the fluorescence wheel 71 and light from the second light source on the same light path; and light source control means that individually controls light emission of the first light source and the second light source. The light source control means lights up the second light source at a time when radiating the light from the first light source so as to include a period of time during which one of boundaries between the fluorescence emitting part 1B and the fluorescence emitting part 1G is irradiated with the light from the first light source and synthesizes the green color and blue color from the fluorescence wheel 71 and the red color from the second light source to generate a white color.

Description

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

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer, a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called a DMD (digital micromirror device) or a liquid crystal plate to display 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. However, in recent years, developments and proposals using light-emitting diodes, laser diodes, organic EL, phosphor light emission, etc. as light sources have been made. A lot has been done. For example, in Japanese Patent Application Laid-Open No. 2004-341105 (Patent Document 1), a disk-shaped transparent substrate provided with a phosphor layer that receives ultraviolet light as excitation light emitted from a solid light source and converts it into visible light. A light source device having a fluorescent wheel and a solid-state light source has been proposed.

JP 2004-341105 A

  The proposal of Patent Document 1 can irradiate the phosphor layer formed on the wheel surface with ultraviolet light as excitation light to emit fluorescent light in the red, green, and blue wavelength bands. Since the efficiency is lower than the luminous efficiency of the other phosphors, there is a problem that the red luminance is insufficient when the arrangement ratio of the phosphor layers in the wheel circumferential direction is made approximately the same.

  The present invention has been made in view of such problems of the prior art, and includes a light source that excites a phosphor, a light emitting body that has a phosphor of a good luminous efficiency, and a relatively high luminous efficiency. A monochromatic light source that emits light in a wavelength band corresponding to a low-type phosphor, and a light source device capable of improving screen brightness and a projector including the light source device. Yes.

  The light source device of the present invention has a first light source that emits light in a predetermined wavelength band and a plurality of segment regions on a base material, and the light from the first light source is irradiated onto the plurality of segment regions. A light emitter that sequentially emits light of different wavelength bands for each segment region; a light source that emits light from the first light source; and a second light source that emits light of a wavelength band different from the light emitted from the light emitter. A condensing optical system for condensing the light emitted from the light emitter and the light emitted from the second light source on the same optical path, and individually controlling the light emission of the first light source and the second light source Light source control means, and the light source control means includes at least a period in which light from the first light source is irradiated to a boundary between predetermined adjacent segment regions of the light emitter. Characterized by lighting To.

  In addition, the light emitting body includes a fluorescent light emitting unit having a phosphor layer in which at least one of the plurality of segment regions receives light from the first light source and emits light in a wavelength band different from the light from the first light source. It is characterized by being.

  The first light source is an ultraviolet laser emitter.

  The phosphors are a phosphor that emits at least a blue wavelength band light upon receiving light from the first light source, and a phosphor that emits a green wavelength band light.

  The first light source is a blue wavelength band laser emitter, and at least one of the plurality of segment regions in the light emitting body is a transmission unit that transmits light from the first light source. There is also.

  In this case, the phosphor is a phosphor that emits light of at least a green wavelength band in response to light from the first light source.

  And the diffusion layer which diffuses the light from said 1st light source may be formed in the permeation | transmission part of the said light emitting body.

  Furthermore, the base material on which the phosphor layer in the fluorescent light emitting unit is disposed is a transparent base material that transmits light, and the condensing optical system includes an optical axis of the first light source and an optical axis of the second light source. A dichroic mirror that transmits light from the light source and reflects light from the second light source, or reflects light from the light emitter and transmits light from the second light source at an intersecting position. Is arranged.

  A dichroic layer that transmits light from the first light source and reflects other wavelength band light may be formed on the surface of the fluorescent light emitting unit on which the phosphor layer is disposed.

  The substrate on which the phosphor layer in the fluorescent light emitting unit is disposed is a reflecting plate having a reflecting surface that reflects light, and the condensing optical system is disposed between the first light source and the light emitting body. The dichroic mirror that transmits the light from the first light source and reflects the fluorescent light from the phosphor, and the light from the first light source that has passed through the transmission part of the light emitting body and reflected by the dichroic mirror There may be a plurality of reflecting mirrors and dichroic mirrors that collect the fluorescent light and the light emitted from the second light source on the same optical path and emit them in the same direction.

  The second light source is a light emitting diode in a red wavelength band.

  Further, the light emitting body is a fluorescent wheel made of a base material capable of rotation control.

  Further, the light emitter has two segment regions adjacent to each other, and the light source control means includes a period of passing through the boundary of the two segment regions at one of the boundaries of the two segment regions. When irradiating light from the first light source, the second light source is turned on to emit combined light obtained by combining two types of wavelength band light from the light emitting body and light from the second light source, and Only the light from the second light source is emitted by turning on the second light source when the first light source is turned off so as to include the period of passing through the boundary between the two segment regions at the other of the two segment region boundaries. It is suitable that it is configured.

  The projector of the present invention includes any one of the light source devices described above, a display element, 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. A projection-side optical system that projects onto a screen and projector control means for controlling the light source device and the display element are provided.

  According to the present invention, a light source that excites a phosphor, a light emitting body that has a phosphor with a good luminous efficiency, and a phosphor with a relatively low luminous efficiency without forming the phosphor on the light emitting body. By providing a monochromatic light source that emits light in a wavelength band corresponding to a phosphor with low luminous efficiency, it is possible to provide a light source device capable of improving the brightness of the screen and a projector equipped with this light source device. .

  And when irradiating light from the first light source so as to straddle the boundary of the segment area such as the fluorescent light emitting part of the light emitting body, the second light source is turned on, and two types of wavelength band light emitted from the light emitting body and By combining the wavelength band light emitted from the second light source, it is possible to provide a light source device capable of further improving the brightness of the screen and a projector including the light source device.

It is an external appearance perspective view which shows the projector provided with the light source device which concerns on the Example of this invention. It is a figure which shows the functional circuit block of the projector provided with the light source device which concerns on the Example of this invention. 1 is a schematic plan view showing an internal structure of a projector including a light source device according to an embodiment of the present invention. It is the front schematic diagram of the fluorescent wheel which concerns on the Example of this invention, and the plane schematic diagram which shows a partial cross section. It is a plane schematic diagram of the light source device which concerns on the Example of this invention. It is a front schematic diagram of the fluorescent wheel which shows the lighting range of the 1st and 2nd light source which concerns on the Example of this invention. It is a schematic diagram which shows the light quantity ratio of each color fluorescence light inject | emitted from the fluorescence wheel at the time of making a 1st light source always light. It is a time chart which shows the blink timing of the 1st light source of the light source control means based on the Example of this invention, and a 2nd light source. It is a schematic diagram which shows the light quantity ratio of each color fluorescent light inject | emitted from the fluorescent wheel which concerns on the Example of this invention, and 2nd light source light. It is a schematic diagram which shows the light quantity ratio of each color fluorescent light inject | emitted from the fluorescent wheel which concerns on the Example of this invention, and 2nd light source light. It is the plane schematic diagram which shows the front schematic diagram of the fluorescent wheel of another form in the light source device which concerns on the Example of this invention, and a partial cross section. It is the front schematic diagram and the plane schematic diagram which show a partial cross section of the fluorescent wheel which concerns on the modification of this invention. It is a plane schematic diagram of the light source device which concerns on the modification of this invention.

  Hereinafter, modes 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. Projection-side optical system 90 for projecting, projector control means for controlling the light source device 63 and the display element 51, and a light source that is a light source control means for individually controlling the light emission of the first light source 72 and the second light source 82 of the light source device 63 And a control circuit 41.

  The light source device 63 includes a fluorescent wheel 71, a first light source 72 and a second light source 82, and a condensing optical system. The fluorescent wheel 71 is a light emission body that can be controlled to rotate, and is formed of a transparent base material that transmits light in a disk shape. The fluorescent wheel 71 has two semicircular segment regions adjacent to each other. One of the segment regions is a fluorescent light emitting unit 1B having a phosphor layer 131B that receives light emitted from the first light source 72 as excitation light and emits blue wavelength band light, and the other is from the first light source 72. The fluorescent light emitting unit 1G includes a phosphor layer 131G that receives emitted light as excitation light and emits green wavelength band light. In other words, when the light from the first light source 72 is applied to the rotating fluorescent wheel 71 at a predetermined timing, the blue wavelength light and green light are sequentially emitted from the blue fluorescent light emitting unit 1B and the green fluorescent light emitting unit 1G that have received the light. Wavelength band light is emitted.

  The transparent base material of the fluorescent wheel 71 is formed of a glass base material or a transparent resin base material. In addition, a dichroic layer 132 that transmits excitation light from the first light source 72 and reflects other wavelength band light is formed on the surface of the transparent substrate on the side where the phosphor layer 131 is disposed by coating. Yes. Further, a non-reflective coating layer is formed by coating on the surface of the transparent substrate opposite to the side where the phosphor layer 131 is disposed.

  The first light source 72 is a laser emitter that emits light in the ultraviolet region having a shorter wavelength than the blue and green wavelength band light emitted from the blue phosphor layer 131B and the green phosphor layer 131G. The first light source 72 is arranged so as to irradiate the phosphor layer 131 disposed on the fluorescent wheel 71 with light.

  The second light source 82 is a light emitting diode that emits blue fluorescent light and green fluorescent light emitted from the phosphor layer 131 of the fluorescent wheel 71 and red wavelength band light different from the ultraviolet light emitted from the first light source 72. .

  The condensing optical system is an optical system that condenses the light emitted from the fluorescent wheel 71 and the light emitted from the second light source 82 on the same optical path. In this condensing optical system, a dichroic mirror 151 is disposed at a position where the optical axis of the first light source 72 and the optical axis of the second light source 82 intersect. The dichroic mirror 151 transmits blue fluorescent light and green fluorescent light emitted from the fluorescent wheel 71 and reflects light from the second light source 82. The dichroic mirror 151 is disposed on the light emission side from the fluorescent wheel 71 to prevent the light from the second light source 82 from being applied to the fluorescent wheel 71.

  Then, the light source control means transmits light from the first light source 72 so that the irradiation region 7 extends over the two segment regions at one of the boundaries between the two segment regions, that is, includes a period of passing through the boundary between the two segment regions. The second light source 82 is controlled to be turned on when irradiating the light. Thereby, white light obtained by combining the blue fluorescent light and green fluorescent light emitted from the fluorescent wheel 71 and the red light source light from the second light source 82 can be emitted from the light source device 63.

  Further, this light source control means is irradiated with light from the first light source 72 so that the irradiation region 7 straddles the two segment regions at the other boundary between the two segment regions, and is divided into two types (blue and green) from the fluorescent wheel 71. The second light source 82 is controlled to be turned on when the first light source 72 is turned off so as to prevent the combined light of the wavelength band from being emitted. That is, by turning on the second light source 82 when turning off the first light source 72 so as to include a period of passing through the boundary between the two segment regions, only the red wavelength band light from the second light source 82 is emitted from the light source device 63. Can be injected from.

  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 directions with respect to the projection direction, and front and rear indicate the front and rear directions with respect to the traveling direction of the light bundle emitted from the projector 10. 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 section 37 is provided on the top panel 11 which is a main body case. The key / indicator section 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 of the main body case, there are provided various terminals 20 such as an input / output connector portion 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 drive unit 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.

  In addition, 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 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 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.

  Further, the control unit 38 controls a light source control circuit 41 that is a light source control means. The light source control circuit 41 individually emits light from the first light source and the second light source of the light source device 63 according to the image signal. Control. 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. In addition, 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, or to turn 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 light source control circuit board 102 to which a power circuit block 101 and the like are attached in the vicinity of the right panel 14, and a sirocco fan type blower 110 is 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 casing, 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 light source 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.

  The light source device 63 includes a fluorescent wheel 71, a wheel motor 73, a first light source 72 and a second light source 82, and a condensing optical system. The fluorescent wheel 71 is a light emitting body that receives light of a predetermined wavelength band emitted from the first light source 72 and emits light of green and blue wavelength bands that are primary colors. The wheel motor 73 is a drive device that rotationally drives the fluorescent wheel 71 by being controlled by the control unit 38 of the projector control means. The first light source 72 is a laser emitter that emits light in the ultraviolet region, and is arranged so that light can be applied to the phosphor layer of the fluorescent wheel 71. The second light source 82 is a light emitting diode that emits red wavelength band light, which is the primary color.

  The first light source 72 and the second light source 82 will be described. The first light source 72 irradiates the phosphor layer formed in the vicinity of the outer peripheral portion of the fluorescent wheel 71 with light. This phosphor layer contains phosphors that emit blue and green wavelength band light described later. Then, the first light source 72 irradiates the phosphor layer with light in the ultraviolet region, which is invisible light having a shorter wavelength than the phosphor. Therefore, the phosphor can absorb the light in the ultraviolet region as excitation light, and can efficiently emit the phosphor.

  The second light source 82 emits blue fluorescent light and green fluorescent light emitted from the phosphor layer of the fluorescent wheel 71 and light in a red wavelength band different from the ultraviolet light emitted from the first light source 72. In this way, by providing a red light source separately without providing a red phosphor layer with a relatively low luminous efficiency, a red color suitable for the amount of light from the blue and green phosphor layers with a relatively high luminous efficiency. The brightness of the screen can be improved by obtaining light.

  Next, the fluorescent wheel 71 will be described with reference to FIG. The fluorescent wheel 71 is made of a thin-walled circular transparent substrate including a phosphor layer 131. The transparent substrate is a glass substrate or a transparent resin substrate that transmits light. A circular opening corresponding to the shape of the rotating shaft of the wheel motor 73 is formed at the center of the base material. The fluorescent wheel 71 is firmly connected to the rotating shaft of the wheel motor 73 by inserting the rotating shaft into the circular opening and bonding the motor hub in the vicinity of the central portion of the transparent base material.

  Therefore, the fluorescent wheel 71 is rotated in the circumferential direction at a rotational speed of about 120 times per second or the like by the wheel motor 73 controlled by the control unit 38 of the projector control means. That is, the rotation of the fluorescent wheel 71 can be controlled by the control unit 38 via the wheel motor 73.

  The fluorescent wheel 71 has two semicircular segment regions adjacent to each other. One of the segment regions is a blue fluorescent light emitting portion 1B having a phosphor layer 131B that receives the light from the first light source 72 as excitation light and emits light in the blue wavelength band, and the other is the light from the first light source 72. The green fluorescent light emitting section 1G includes a phosphor layer 131G that receives excitation light and emits green wavelength band light.

  A band-shaped recess is formed in the vicinity of the outer peripheral portion of the fluorescent light emitting portion 1 of the transparent substrate, and the phosphor layer 131 is formed in the recess. The phosphor layers 131B and 131G contain a phosphor that receives light from the first light source 72, absorbs the light as excitation light, and emits light in the blue and green wavelength bands that are primary colors when excited. It is a layer to do. By forming the phosphor layer 131 in this way, the fluorescence wheel 71 functions as a light emitting body that emits light in the blue and green wavelength bands. The phosphor layer 131 is composed of a phosphor crystal and a binder.

  A dichroic layer 132 that transmits light from the first light source 72 and reflects other wavelength band light is formed on the surface of the transparent substrate on which the phosphor layer 131 is disposed. That is, the phosphor layer 131 is formed on the dichroic layer 132. Note that the dichroic layer 132 may be formed not only on the phosphor layer 131 but also on the entire surface of the fluorescent wheel 71. Further, since the dichroic layer 132 only needs to be provided between the first light source 72 and the phosphor layer 131, the dichroic layer 132 may be formed on the surface of the transparent substrate on the first light source 72 side.

  Further, a non-reflective coating layer (not shown) is formed on the entire surface of the transparent substrate on the first light source 72 side by coating.

  The fluorescent wheel 71 can also be formed of two filter pieces corresponding to two segment regions on the transparent substrate, and the phosphor layers 131B and 131G are formed with the respective filter pieces, and then the circular shape is formed. May be combined with each other, or may be integrated by an attachment member or the like.

  As described above, since the band-like blue phosphor layer 131B and the green phosphor layer 131G are arranged adjacent to each other in the circumferential direction in each of the fluorescent light emitting sections 1B and 1G, the blue and green fluorescence of the rotating fluorescent wheel 71 is obtained. When the body layers 131B and 131G are sequentially irradiated with light in the ultraviolet region, fluorescent light in the blue wavelength band and fluorescent light in the green wavelength band are sequentially emitted from the fluorescent wheel 71 corresponding to the emission of the first light source 72. It will be.

  In the fluorescent wheel 71, as described above, the dichroic layer 132 is formed on the surface of the transparent substrate on which the phosphor layer 131 is disposed, and the non-reflective coating layer is formed on the surface on the first light source 72 side. As a result, when the light from the first light source 72 is applied to the fluorescent wheel 71, the light source light passes through the non-reflective coating layer on the incident surface with almost no reflection to the first light source 72 side, and passes through the transparent substrate. Incident. The light source light that has passed through the transparent substrate passes through the dichroic layer 132 and is irradiated on the phosphor layer 131.

  The phosphors in the phosphor layers 131B and 131G absorb ultraviolet light source light as excitation light and emit fluorescent light in blue and green wavelength bands in all directions. Among these, the fluorescent light emitted toward the side opposite to the first light source 72 enters the light guide device 75 via a condensing optical system described later. Further, the fluorescent light emitted to the transparent substrate side is reflected by the dichroic layer 132, and most of the reflected light is incident on the light guide device 75 through the condensing optical system as emitted light from the fluorescent wheel 71. It will be.

  Next, the arrangement configuration of the condensing optical system including the dichroic mirror 151, the reflection mirror 152, and the lens, and the first light source 72, the second light source 82, and the fluorescent wheel 71 will be described with reference to FIG. The condensing optical system reflects or transmits the blue fluorescent light and green fluorescent light emitted from the fluorescent wheel 71 and the red light source light emitted from the second light source 82, thereby converting the optical axis of each color light. It is an optical system that matches and collects each color light on the same optical path.

  The first light source 72 is arranged so that the optical axis of the first light source 72 is substantially orthogonal to the optical axis of the light guide device 75. The second light source 82 is arranged so that the optical axis of the second light source 82 is substantially parallel to the optical axis of the light guide device 75. The fluorescent wheel 71 is arranged so that the optical axis of the first light source 72 and the wheel surface of the fluorescent wheel 71 are orthogonal to each other. That is, the rotation axis of the wheel motor 73 that rotates the fluorescent wheel 71 is parallel to the optical axis of the first light source 72. In addition, a collimator lens 150 that converts light from the first light source 72 into parallel light is disposed in the immediate vicinity of the emission side of the first light source 72.

  In this condensing optical system, the dichroic mirror 151 is disposed at a position where the optical axis of the first light source 72 and the optical axis of the second light source 82 intersect. The dichroic mirror 151 transmits the blue fluorescent light and the green fluorescent light emitted from the fluorescent wheel 71, and reflects the red light source light emitted from the second light source 82 by changing the direction at an angle of 90 degrees. The dichroic mirror 151 is disposed on the light emission side from the fluorescent wheel 71 to prevent the light from the second light source 82 from being applied to the fluorescent wheel 71.

  Further, in the condensing optical system, the reflection mirror 152 is disposed at a position where the optical axis of the first light source 72 and the optical axis of the light guide device 75 intersect. The reflection mirror 152 reflects the blue fluorescent light and green fluorescent light from the fluorescent wheel 71 and the red light source light reflected by the dichroic mirror 151 while changing the direction at an angle of 90 degrees toward the light guide device 75 side.

  In addition, a condensing lens group 155 is disposed in the vicinity of the exit surface of the fluorescent wheel 71. As a result, the light beam emitted from the fluorescent wheel 71 is condensed and applied to the dichroic mirror 151. Similarly, a condensing lens group 155 is disposed near the exit surface of the second light source 82. As a result, the light beam emitted from the second light source 82 is condensed and applied to the dichroic mirror 151. Further, a light guide device incident lens 154 is disposed between the dichroic mirror 151 and the reflection mirror 152. Accordingly, each color light is incident on the light guide device 75 as a more concentrated light bundle.

  By configuring the condensing optical system in this way, as described later, when the fluorescent wheel 71 is rotated and light is emitted from the first light source 72 and the second light source 82 at different timings, red, green, blue, and white Are sequentially incident on the light guide device 75 via the condensing optical system, and the DMD which is the display element 51 of the projector 10 displays the light of each color in a time-sharing manner according to the data, thereby producing a color image on the screen. Can be generated.

  Next, control of the first light source 72 and the second light source 82 by the light source control means will be described. The light source control unit individually controls the blinking operation of the first light source 72 and the second light source 82 in a time-sharing manner. Then, the light source control means emits light from the first light source 72 so that the irradiation region extends over the two segment regions at one of the boundaries between the two segment regions, that is, includes a period of passing through the boundary between the two segment regions. The second light source 82 is controlled to be turned on when irradiating the light. That is, the light source control means turns on the second light source 82 so as to include a period in which the light from the first light source 72 is applied to one of the borders of the adjacent segment regions of the fluorescent wheel 71, whereby the fluorescent wheel 71 The light source device 63 can emit white wavelength band light in which the blue and green wavelength band light emitted from the light source and the red wavelength band light emitted from the second light source 82 are combined.

  In addition, the light source control means is irradiated with light from the first light source 72 so that the irradiation region straddles the two segment regions at the other boundary between the two segment regions, and two types (blue and green) are emitted from the fluorescent wheel 71. The second light source 82 is controlled to be turned on when the first light source 72 is turned off so as to prevent the combined light of the wavelength band from being emitted. That is, by turning on the second light source 82 when turning off the first light source 72 so as to include a period of passing through the boundary between the two segment regions, only the red wavelength band light from the second light source 82 is emitted from the light source device 63. Can be injected from.

  Hereinafter, the usefulness of performing the above control will be described with reference to FIGS. FIG. 6 is a schematic front view of the fluorescent wheel 71 showing the lighting range of the first and second light sources 72 and 82 according to the embodiment of the present invention. FIG. 7 is a schematic diagram showing the light quantity ratio of each color fluorescent light emitted from the fluorescent wheel 71 when the first light source 72 is always turned on. FIG. 8 is a time chart showing the blinking timing of the first light source 72 and the second light source 82 of the light source control means. FIG. 9 and FIG. 10 are schematic views showing the light quantity ratio of each color fluorescent light emitted from the fluorescent wheel 71 according to the embodiment of the present invention. 7, 9, and 10, the light quantity ratio with respect to the rated operation is shown (that is, expressed as a dimensionless number where the light quantity ratio at the rated operation is 1). The transition of the light quantity ratio is represented by a solid line, a one-dot chain line, and a broken line, respectively.

  As shown in FIG. 6, the fluorescent wheel 71 is arranged so that the blue fluorescent light emitting portion 1B and the green fluorescent light emitting portion 1G are adjacent to each other. Therefore, if the fluorescent wheel 71 is rotated while the first light source 72 is turned on, the irradiation region 7 of the first light source 72 is in contact with the blue phosphor layer 131B and the green fluorescent light at the boundary between the blue and green fluorescent light emitting units 1B and 1G. Since it straddles the body layer 131G, mixed color light is generated.

  The mixed color emission range in the fluorescent wheel 71 where the mixed color light is generated is when the center of the irradiation region 7 of the first light source 72 light is located at the boundary between the blue fluorescent light emitting unit 1B and the green fluorescent light emitting unit 1G as shown in the figure. Is a range surrounded by a tangent line E to the irradiation region 7. The tangent line E is a virtual line that represents a predetermined position of the fluorescent wheel 71. This color mixture light emission range is a fan-shaped region in which the central angle around the boundary line between the blue fluorescent light emitting unit 1B and the green fluorescent light emitting unit 1B is an acute angle.

  That is, when the first light source 72 is in the lighting state, when the fluorescent wheel 71 rotates and the tangent line E (virtual line) moves, the center of the irradiation region 7 of the fixed first light source 72 is on the fluorescent wheel 71. Color mixing occurs when the tangent line E is located, that is, when the boundary line between the green phosphor layer 131G and the blue phosphor layer 131B is applied to the end of the irradiation region 7. When the other tangent line E on the fluorescent wheel 71 moving by rotation is located at the center of the irradiation region 7, that is, the boundary line between the green and blue phosphor layers 131G and 131B is at the other end of the irradiation region 7. Switch to single color emission when positioned.

  Therefore, when the fluorescent wheel 71 is rotated in a state where only the first light source 72 is always lit, the combined light of the blue wavelength band and the green wavelength band is emitted from the fluorescent wheel 71 in the mixed color emission range as shown in FIG. Will be injected from. In this mixed color emission range, the combined light can be emitted as complementary color cyan wavelength band light and used for luminance improvement. In this case, however, the amount of light used as normal cyan wavelength band light is used. Compared to, only about half the light intensity can be obtained. This is because, as shown in the figure, in the mixed light emission range, the average value of the amounts of light in the green and blue wavelength bands is half that of the rated operation.

  Therefore, in one of the ¼ ranges including the mixed color emission range, for example, the first light source 72 is turned off and only the second light source 82 is turned on to emit red light, and on the other hand, the first and second light sources are emitted. White light is generated by causing the light source control means to execute control to turn on 72 and 82. In the other ¼ range that does not include the mixed-color emission range, the light source control unit is caused to perform control to turn on only the first light source 72 to emit green light and blue light. Accordingly, green, red, blue, and white band light can be sequentially emitted from the light source device 63.

  Specifically, as shown in FIGS. 6 and 8, a range of ¼ of the wheel angle of 45 to 135 degrees is set as a first light source lighting range L <b> 1 for lighting only the first light source 72. A range of ¼ of 225 degrees is set as a second light source lighting range L2 in which only the second light source 82 is lit. Further, a range of 1/4 of the wheel angle 225 to 315 degrees is set as a first light source lighting range L1 for lighting only the first light source 72, and a range of 1/4 of the wheel angle 315 to 45 degrees is the first range. The first and second light source lighting ranges L12 for turning on the light source 72 and the second light source 82 are set.

  Here, the wheel angle in the figure is a position on the wheel surface with reference to one boundary line position of the green fluorescent light emitting part 1G and the blue fluorescent light emitting part 1B in the fluorescent wheel 71 shown in FIG. (Specifically, the position of the wheel surface arranged at the center of the irradiation region 7) is expressed as an angle, and this position moves with the rotation of the fluorescent wheel 71.

  Accordingly, only the first light source 72 is turned on when the wheel position at the wheel angle of 45 to 135 degrees is located at the center of the irradiation region 7, so that the light emitted from the first light source 72 is emitted from the fluorescent wheel 71. The green phosphor layer 131G of the green fluorescent light emitting unit 1G is irradiated. Thereby, green fluorescent light (G) emitted from the fluorescent wheel 71 is emitted from the light source device 63 and enters the light guide device 75.

  Then, when the light source control means is positioned at the center of the irradiation area 7 of the first light source 72, the wheel position at a wheel angle of 135 degrees, which is before the boundary between the green fluorescent light emitting unit 1G and the blue fluorescent light emitting unit 1B, When the one light source 72 is turned off and the second light source 82 is turned on, only the red light source light (R) from the second light source 82 is emitted from the light source device 63 and enters the light guide device 75.

  In addition, when the fluorescent wheel 71 rotates and the wheel position with a wheel angle of 225 degrees is located at the center of the irradiation region 7, the light source control means performs control to turn on the first light source 72 and turn off the second light source 82. Thus, the light from the first light source 72 is applied to the blue phosphor layer 131B of the blue fluorescent light emitting unit 1B of the fluorescent wheel 71. Thereby, the blue fluorescent light (B) emitted from the fluorescent wheel 71 is emitted from the light source device 63 and enters the light guide device 75.

  And, when the center of the irradiation area 7 of the first light source 72 is located in the range of the wheel angle 315 to 45 degrees, when the light source control means performs control to turn on the second light source 82 together with the first light source 72, The green and blue fluorescent lights emitted from the fluorescent wheel 71 and the red light source light emitted from the second light source 82 are combined, and white light (W) is emitted from the light source device 63. Therefore, the light source device 63 sequentially emits light in the wavelength bands of green (G), red (R), blue (B), and white (W), so that the projector 10 enters according to the data. By displaying each color light on the display element 51 in a time-sharing manner, a color image can be generated on the screen.

  Although not shown in the drawings, the light source control means prevents the brightness from being lowered when neither the first light source 72 nor the second light source 82 is turned on, so that the wheel angles are 135 degrees and 225 degrees. When the wheel position of the first light source 72 and the second light source 82 are positioned at the center of the irradiation region 7, the other light source is turned on shortly before turning off one of the first light source 72 and the second light source 82. The timing of turning on and off the light source 82 is controlled.

  Then, in the first and second light source lighting range L12 (wheel angle 315 to 45 degrees), when the red light emitted without changing the current value or load of the second light source 82 is combined with the green and blue light, the wheel As shown in FIG. 7, the light quantity of green and blue light in the angle range of 315 to 45 degrees is halved as an average value compared with the light quantity in the green (G) or blue (B) monochromatic light emission range. White light. Therefore, it is preferable to adjust the control current value, the load, the light emission time, and the like for the second light source 82 so that the light amount of the second light source 82 is halved.

  With reference to FIG. 9 and FIG. 10, the increase / decrease control of the output of the first light source 72 or the second light source 82 for generating white light in which the average light amount of each color light is substantially equal will be described. The light quantity ratios of the red, green, and blue wavelength bands are shown in FIGS. 9 and 10 (a) to 9 and 10 (c), respectively, and those combined into one are shown in FIG. 9 (d) and FIG. 10 (d). For example, as shown in FIG. 9A, the load on the second light source 82 can be reduced so that the amount of red light in the first and second light source lighting ranges L12 is halved relative to the second light source lighting range L2. For example, as shown in FIG. 9 (b) and FIG. 9 (c), the first and second light source ranges L12 as shown in FIG. 9 (d) without changing the light quantity ratio of the green and blue band lights. It is possible to generate white light in which the average light amount of each color light is equal.

  As described above, the lighting control of the first light source 72 and the second light source 82 is executed by the light source control means in accordance with the rotation of the fluorescent wheel 71, so that green (G), red (R), blue (B), White (W) can be sequentially emitted and incident on the light guide device 75. In addition, luminance can be improved by emitting white light.

  Alternatively, the load of the first light source 72 is increased instead of decreasing the load of the second light source 82, so that the average light amount of each color light can be adjusted to be equal. In this case, as shown in FIGS. 10B and 10C, in the first light source lighting range L1, the first light source 72 is operated at the rated load, whereas the first and second light source lighting ranges are set. In L12, if the first light source 72 is operated by applying a load about twice as high as that at the time of rating, as shown in FIG. As shown in d), bright white light can be generated to further improve the luminance.

  Although the output is increased so that the first light source 72 is instantaneously overloaded (over the rated load value) in the 1/4 range, the output is increased in another 1/4 range (second light source lighting range L2). Since there is one light source extinguishing range, the load average can maintain the rated value.

  As described above, according to the present invention, the first light source 72 that excites the phosphor, the fluorescent wheel 71 having a phosphor with a good luminous efficiency, and a phosphor with a relatively low luminous efficiency such as red A second light source 82 that is a monochromatic light source that emits light in the red wavelength band corresponding to the phosphor with low emission efficiency without forming the phosphor on the phosphor wheel 71, thereby improving the brightness of the screen. It is possible to provide the light source device 63 that can be used, and the projector 10 including the light source device 63.

  Further, from the first light source 72 so as to straddle the boundary between the fluorescent light emitting portions 1B, 1G of the fluorescent wheel 71, that is, to include the period during which the light from the first light source 72 is irradiated to the boundary between the fluorescent light emitting portions 1B, 1G. When the light is irradiated, the second light source 82 is turned on, and the white wavelength band light is synthesized by combining the green and blue wavelength band light emitted from the fluorescent wheel 71 and the red wavelength band light emitted from the second light source 82. Therefore, it is possible to provide the light source device 63 that can further improve the brightness of the screen and the projector 10 including the light source device 63.

  The type of light source employed in the light source device 63 and the configuration of the fluorescent wheel 71 are not limited to the above-described embodiments. For example, a light emitting diode may be used for the first light source 72, and a laser light emitter may be used for the second light source 82. By adopting a laser emitter as the first light source 72 as an excitation light source, it is possible to efficiently excite phosphors by emitting high-power excitation light, and to employ a light emitting diode as the second light source 82. Thus, the product cost can be reduced.

  The first light source 72 is not limited to a light source that emits light in the ultraviolet wavelength band, and a light emitting diode or laser emitter in the blue wavelength band can also be employed. Hereinafter, a modified example in which the blue laser emitter is adopted as the first light source 72 will be described.

  When a blue wavelength band laser emitter is adopted as the first light source 72, as shown in FIG. 11, the fluorescent wheel 71 is replaced with the blue fluorescent light emitting portion 1B (see FIG. 4) described above, and the segment region is blue. It is formed as a transmission part 2 that transmits excitation light without absorbing it.

  The transmission unit 2 is a semicircular diffusion plate that transmits blue wavelength band light from the first light source 72 and has a diffusion layer 141 on a surface opposite to the first light source 72 side. Specifically, the diffusion layer 141 is subjected to an optical process such as a roughing process such as a blasting process on a semi-circular transparent base material, so that the incident blue light source light is transmitted. It is formed as a layer that imparts a diffusion effect.

  Note that the diffusion layer 141 may be formed by fixing a belt-like solid material, which is an optical substance, in addition to performing an optical treatment on the surface of the transparent substrate. Further, the diffusion layer 141 may be formed on the surface on the first light source 72 side without forming the diffusion layer 141 on the surface opposite to the first light source 72.

  Therefore, when the laser light in the blue wavelength band is irradiated from the first light source 72 to the diffusion layer 141, the light emitted from the green phosphor layer 131G (in order to impart a diffusion effect to the blue light source light incident on the diffusion layer 141 ( Blue light, which is diffused light similar to green fluorescent light), is emitted from the diffusion layer 141, and the blue light is incident on the light guide device 75 via the condensing optical system.

  In this way, the fluorescent wheel 71 is formed by the green fluorescent light emitting portion 1G having the green phosphor layer 131G and the transmissive portion 2 having the diffusion layer 141, and the excitation light is emitted from the first light source 72 as blue wavelength band light. Even in this case, the light source control means executes the same light source control as described above, and the same effect can be obtained. Further, since the blue light from the first light source 72 can be used as it is as the emitted light from the light source device 63, the use of a relatively expensive phosphor can be suppressed and the product cost can be suppressed.

  The base material of the fluorescent light emitting unit 1 of the fluorescent wheel 71 is not limited to a transparent base material, and a metal base material can also be used. Hereinafter, a fluorescent wheel 71 using a metal substrate will be described with reference to FIG. The fluorescent wheel 71 employs a metal base material instead of the transparent base material of the fluorescent light emitting unit 1.

  A reflective surface for reflecting light is formed on the surface of the metal base on the first light source 72 side. That is, this base material is a mirror-shaped semicircular reflecting plate, and the other semicircular part is a transparent base material, and the diffusion layer 141 is formed. The first light source 72 is disposed on the side where the phosphor layer 131 is formed.

  Therefore, when the phosphor of the phosphor layer 131 absorbs blue light source light as excitation light and emits fluorescent light in the green wavelength band in all directions, the green fluorescent light emitted toward the first light source 72 side is The light enters the light guide device 75 via a condensing optical system described later. Further, the green fluorescent light emitted toward the base material is reflected by a reflective layer (not shown), and most of the reflected light is emitted as light emitted from the fluorescent wheel 71 via the condensing optical system 75. Is incident on.

  In addition, the blue light source light irradiated on the reflection layer without being absorbed by the phosphor of the phosphor layer 131 can also be reflected by the reflection layer and emitted again to the phosphor layer 131 side to excite the phosphor. Therefore, utilization efficiency of blue light source light can be improved and light can be emitted more brightly.

  The blue light source light that is reflected by the reflective layer and is not absorbed by the phosphor and returns to the first light source 72 side from the phosphor layer 131 travels from the phosphor layer 131 to the first light source 72 side together with the green fluorescent light. The blue light source light is separated from the green fluorescent light by the first optical axis conversion mirror 157a, which is a dichroic mirror that reflects green light and transmits blue light. That is, only the green fluorescent light out of the light emitted from the fluorescent wheel 71 to the first light source 72 side is reflected by the dichroic mirror and enters the light guide device 75 via other mirrors and lenses of the condensing optical system. To do.

  An example of a condensing optical system in the case where the base material is a reflecting plate will be described with reference to FIG. The condensing optical system includes a reflection mirror group 160 that is disposed on the optical axis of the first light source 72 and reflects the light from the first light source 72 by changing the direction at an angle of 90 degrees. Further, the condensing optical system reflects or transmits light of a predetermined wavelength band emitted from the fluorescent wheel 71 and the second light source 82, and transmits blue light and green light from the fluorescent wheel 71 and the second light source 82. The dichroic mirror and the reflecting mirror for condensing the red light on the same optical path, and the lens for condensing the light bundle of each color wavelength band.

  This condensing optical system includes an optical axis of green fluorescent light and an optical axis of blue light source light emitted and separated from the fluorescent wheel 71 in different directions, and an optical axis of red light source light emitted from the second light source 82. , And four optical axis conversion mirrors 157 arranged at predetermined positions so as to condense light of each color on the same optical path.

  Specifically, this condensing optical system is a dichroic mirror that is disposed between the first light source 72 and the fluorescent wheel 71 and transmits the light of the first light source 72 and reflects the fluorescent light from the phosphor. A first optical axis conversion mirror 157a is provided. In addition, the condensing optical system includes the light of the first light source 72 that has passed through the transmission part 2 of the fluorescent wheel 71, the fluorescent light reflected by the first optical axis conversion mirror 157a, and the light emitted from the second light source 82. Are arranged on the same optical path and can be emitted in the same direction, and includes second to fourth optical axis conversion mirrors 157b, 157c and 157d which are dichroic mirrors.

  The first optical axis conversion mirror 157a is arranged on the optical axis of the first light source 72 and the optical axis of the second light source 82, the direction of which is changed by the reflection mirror group 160 at an angle of 90 degrees. It is arranged between the fluorescent wheel 71. Further, the first optical axis conversion mirror 157a does not change the blue light source light (excitation light) reflected by the reflection mirror group 160 and the optical axis of the second light source 82, and the green light emitted from the fluorescent wheel 71. This is a dichroic mirror that converts the optical axis of fluorescent light by 90 degrees. That is, the first optical axis conversion mirror 157a transmits the blue light source light as the excitation light emitted from the first light source 72 and the red light source light from the second light source 82, and the phosphor layer of the fluorescent wheel 71. Fluorescent light in the green wavelength band emitted from 131 phosphors is reflected by changing its direction at an angle of 90 degrees.

  The second optical axis conversion mirror 157b is disposed on the opposite side of the first light source 72 with respect to the fluorescent wheel 71 on the optical axis of the first light source 72 converted by the reflecting mirror group 160. This is a normal reflection mirror that converts the optical axis of the blue light source light transmitted through the diffusion layer 141 in the transmission part 2 of 71 by 90 degrees. That is, the second optical axis conversion mirror 157b reflects the blue wavelength band light emitted from the fluorescent wheel 71 by changing the direction at an angle of 90 degrees. The second optical axis conversion mirror 157b may be a dichroic mirror that can reflect blue wavelength band light without using a reflection mirror.

  The third optical axis conversion mirror 157c faces the first optical axis conversion mirror 157a on the optical axis of green fluorescent light converted by the first optical axis conversion mirror 157a (that is, on the optical axis of the second light source 82). The reflection mirror is arranged so as to convert the fluorescent light converted by the first optical axis conversion mirror 157a and the optical axis of the second light source 82 by 90 degrees. That is, the third optical axis conversion mirror 157c reflects the green fluorescent light reflected by the first optical axis conversion mirror 157a and the red light source light from the second light source 82 while changing the direction by an angle of 90 degrees. The third optical axis conversion mirror 157c may be a dichroic mirror that can reflect green light and red light without using the reflecting mirror.

  The fourth optical axis conversion mirror 157d is disposed opposite to the second optical axis conversion mirror 157b and the third optical axis conversion mirror 157c, and converts the optical axis of the blue light source light converted by the second optical axis conversion mirror 157b. It is a dichroic mirror that changes the optical axes of the red light source light and the green fluorescent light converted by the third optical axis conversion mirror 157c by 90 degrees without being changed. That is, the fourth optical axis conversion mirror 157d is an optical axis of blue light source light reflected by the second optical axis conversion mirror 157b and an optical axis of green fluorescent light and red light source light reflected by the third optical axis conversion mirror 157c. Is transmitted at the position where the two light axis conversion mirrors 157b reflect the blue light source light and travels straight, and the light in the red and green wavelength bands reflected by the third optical axis conversion mirror 157c is Reflects to change direction by an angle of 90 degrees.

  Thereby, the blue light source light transmitted through the fourth optical axis conversion mirror 157d and the red light source light and the green fluorescent light reflected by the fourth optical axis conversion mirror 157d are condensed on the same optical path, and these All colors of light are emitted in the same direction.

  As described above, by arranging the four optical axis conversion mirrors 157 in the condensing optical system, the light source device 63 is configured so that the optical axes of the blue light and the green light emitted from the fluorescent wheel 71 and the second light source 82 are used. The optical axis of the emitted red light can be converted to coincide with the optical axis of the light guide device 75. Accordingly, since each color light can be condensed on the same optical path and emitted in the same direction, the light of each color emitted from the light source device 63 can be sequentially incident on the light guide device 75.

  As described above, this condensing optical system includes a dichroic mirror, etc., between the first light source 72 and the fluorescent wheel 71 and in the path of the fluorescent light from the fluorescent wheel 71 and the light source light transmitted through the fluorescent wheel 71. It is formed by a lens and a mirror in which a plurality of lenses for condensing light are arranged together with the mirror. As a result, the light beam whose traveling direction has been changed by the mirror can be condensed by the lens, and light can be efficiently incident on the light guide device 75.

  Specifically, the blue light emitted from the plurality of first light sources 72 is converted into parallel light whose directivity is increased by the collimator lens 150, and between the reflection mirror group 160 and the first optical axis conversion mirror 157a. The light is collected by the arranged first convex lens 153a. Further, by arranging the condensing lens group 155 in the vicinity of both the front and back surfaces of the fluorescent wheel 71, the blue band light condensed by the first convex lens 153a is further condensed by the condensing lens group 155. While irradiating the wheel 71, each light bundle emitted from both front and back surfaces of the fluorescent wheel 71 is also condensed. Similarly, the condensing lens group 155 is disposed in the vicinity of the exit surface of the second light source 82, whereby the light beam emitted from the second light source 82 is condensed and applied to the first optical axis conversion mirror 157a. .

  Further, a second convex lens 153b is disposed between the second optical axis conversion mirror 157b and the fourth optical axis conversion mirror 157d, and the third optical axis conversion mirror 157a is interposed between the first optical axis conversion mirror 157a and the third optical axis conversion mirror 157c. A convex lens 153c is disposed, a fourth convex lens 153d is disposed between the third optical axis conversion mirror 157c and the fourth optical axis conversion mirror 157d, and further, between the fourth optical axis conversion mirror 157d and the light guide device 75. Since the light guide device incident lens 154 is disposed on the light guide device 75, the light from the fluorescent wheel 71 and the second light source 82 enters the light guide device 75 as a condensed light bundle.

  The blue light source light emitted from the first light source 72 via the collimator lens 150 is condensed by the first convex lens 153a, passes through the first optical axis conversion mirror 157a, and is further collected by the condenser lens group 155. The phosphor layer 131 or the diffusion layer 141 of the fluorescent wheel 71 is irradiated with light.

  When the light source light is applied to the diffusion layer 141 of the transmission part 2 of the fluorescent wheel 71, the blue light source light that has been transmitted through the diffusion layer 141 and becomes diffused light is converted into the first light source 72 side of the fluorescent wheel 71. Is condensed by a condensing lens group 155 disposed in the opposite direction to the second optical axis conversion mirror 157b. The blue light source light is reflected by the second optical axis conversion mirror 157b, collected by the second convex lens 153b, and then transmitted through the fourth optical axis conversion mirror 157d and collected by the light guide device incident lens 154. And enters the light guide device 75.

  When the light source light is applied to the phosphor layer 131 of the fluorescent light emitting unit 1 of the fluorescent wheel 71, the fluorescent light in the green wavelength band is emitted to the first light source 72 side. Then, the fluorescent light is condensed by the condensing lens group 155 on the first light source 72 side of the fluorescent wheel 71 and applied to the first optical axis conversion mirror 157a. Here, the fluorescent light is reflected by the first optical axis conversion mirror 157a, but the blue light source light reflected without being absorbed by the fluorescent material of the fluorescent material layer 131 passes through the first optical axis conversion mirror 157a. It will be. Thereby, since green fluorescence light and blue light source light are isolate | separated, the fall of color purity can be prevented.

  In addition, the fluorescent light reflected by the first optical axis conversion mirror 157a is collected by the third convex lens 153c and applied to the third optical axis conversion mirror 157c. The fluorescent light is reflected by the third optical axis conversion mirror 157c, collected by the fourth convex lens 153d, and then irradiated to the fourth optical axis conversion mirror 157d. Furthermore, the fluorescent light is reflected by the fourth optical axis conversion mirror 157d, collected by the light guide device incident lens 154, and enters the light guide device 75.

  Then, the red light source light emitted from the second light source 82 and collected by the condenser lens group 155 passes through the first optical axis conversion mirror 157a and, like the green fluorescent light described above, the third optical axis. When guided through the conversion mirror 157c and the fourth optical axis conversion mirror 157d, the light is condensed by the third convex lens 153c, the fourth convex lens 153d, and the light guide device incident lens 154 and enters the light guide device 75.

  By configuring the condensing optical system in this way, the light emitted from the fluorescent wheel 71 has a slight amount of blue light source light reflected from the fluorescent wheel 71 along with the green fluorescent light, but it is a dichroic mirror. By arranging the first optical axis conversion mirror 157a between the first light source 72 and the fluorescent wheel 71, it is possible to cut the blue light source light reflected by the fluorescent wheel 71 mixed in the fluorescent light in the green wavelength band. In addition, it is possible to provide the light source device 63 that can emit each color light with high color purity in which the light source light is surely prevented from being mixed with the fluorescent light, and the projector 10 including the light source device 63.

  Similarly to the above, when the light source control means executes the light source control for rotating the fluorescent wheel 71 and emitting light from the first light source 72 and the second light source 82 at different timings, the wavelengths of green, red, blue and white The band light is sequentially incident on the light guide device 75 via the condensing optical system, and the DMD that is the display element 51 of the projector 10 displays the light of each color in a time-sharing manner according to the data, thereby displaying a bright color image on the screen. Can be generated.

  Then, without providing the diffusing layer 141 in the transmissive part 2 of the fluorescent wheel 71, the transmissive part 2 is formed by a space as a normal glass plate or a through hole having a frame around it, and an optical component that imparts a diffusion effect is fluorescent. There may be a fixed arrangement on the optical path of the laser light, such as the first light source 72 side closest to the wheel 71 or the emission side of the fluorescent wheel 71. In addition, when both the first light source 72 and the second light source 82 are light emitting diodes, the light source device 63 may have a configuration in which the diffusion layer 141 is not provided on the transmission unit 2 or the optical path.

  As described above, the light source device 63 capable of improving the luminance of the screen and the projector 10 including the light source device 63 can also be provided by using a metal base material having a reflecting surface as the base material. In addition, the fluorescent wheel 71 can be efficiently cooled by employing a metal base material having high thermal conductivity.

  The present invention is not limited to the above embodiments, and can be freely changed and improved without departing from the gist of the invention. For example, the light source control means may be provided individually in the light source device 63 without being provided in the projector 10. Further, the layout of each optical component is not limited to the above-described configuration (see FIGS. 5 and 13), and various layouts can be adopted.

  As described above, since the light source device 63 can adopt various optical layouts, not only the luminance of the screen is improved as described above, but also the arrangement of the light source device 63 with respect to a device such as the projector 10 in which the light source device 63 is mounted. The degree of freedom can be increased.

  In the above-described embodiment, the dichroic mirror is used to select the conversion in the optical axis direction and the transmission and reflection according to the wavelength. However, the present invention is not limited to this, and other alternative means such as a dichroic prism is used. The above dichroic mirror may be replaced.

  Furthermore, the segment regions formed on the base material are not limited to being formed so as to be equally divided, and there are cases where three or more regions are formed evenly divided.

  The lighting time of the first light source 72 and the second light source 82 by the light source control means is not limited to the above example, and the lighting time of the first light source 72 and the second light source 82 can be freely changed so as to change the emission time of each color. A wide range of brightness modes can be implemented.

  The light source control means can also freely adjust the brightness by controlling the lighting time of the first light source 72 and the second light source 82 so that the emission time of each color light is shortened. In addition, the hue can be adjusted as a configuration in which the light source control unit controls the first light source 72 or the second light source 82 so as to suppress the light source output only when light in a predetermined wavelength band is emitted.

  Further, the fluorescent wheel 71 may be formed and fixed as a rectangular light emitting body instead of a disc shape. In this case, an adjusting device for changing the irradiation direction of the light from the first light source 72 is disposed between the first light source 72 and the light emitting body, or the position and / or irradiation direction of the first light source 72 is changed. By providing a light source driving device that drives to change, the light spot from the first light source 72 is sequentially positioned in each segment area, thereby guiding each color light through the condensing optical system It can be incident on the device 75. As the adjusting device, for example, an optical polarizer using a KTN crystal, an acoustooptic device, a MEMS mirror, or the like can be employed.

1 Fluorescent light emitting part
1B Blue fluorescent light emitting part 1G Green fluorescent light emitting part
2 Transmission part 7 Irradiation area
10 Projector
11 Top panel 12 Front panel
13 Rear panel 14 Right panel
15 Left panel 17 Exhaust hole
18 Air intake hole 19 Lens cover
20 Various terminals 21 Input / output connector
22 I / O interface 23 Image converter
24 Display encoder 25 Video RAM
26 Display drive unit 31 Image compression / decompression unit
32 Memory card 35 Ir receiver
36 Ir processing section 37 Key / indicator section
38 Control unit 41 Light source 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 71 Fluorescent wheel
72 First light source 73 Wheel motor
74 Optical axis change mirror 75 Light guide device
78 Lighting block 79 Image generation block
80 Projection side block 82 Second light source
84 Irradiation mirror
90 Projection side optical system 93 Fixed lens group
97 Movable lens group 101 Power supply circuit block
102 Light source control circuit board 103 Control circuit board
110 Blower 111 Air inlet
113 Discharge port 114 Exhaust temperature reduction device
120 Partition wall 121 Inlet side space
122 Exhaust side chamber 131 Phosphor layer
131B Blue phosphor layer 131G Green phosphor layer
132 Dichroic layer 141 Diffusion layer
150 collimator lens
151 Dichroic mirror 152 Reflection mirror
153a First convex lens 153b Second convex lens
153c Third convex lens 153d Fourth convex lens
154 Light guiding device incident lens 155 Condensing lens group
157 Optical axis conversion mirror
157a First optical axis conversion mirror 157b Second optical axis conversion mirror
157c Third optical axis conversion mirror 157d Fourth optical axis conversion mirror
160 Reflective mirrors

The present invention relates to a method for controlling a light source device.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a method of controlling a light source device that can improve the brightness of a screen.

The light source device control method of the present invention includes a first light source that emits light in a predetermined wavelength band, and a plurality of segment regions on a base material, and the light from the first light source is irradiated onto the plurality of segment regions. Accordingly, a light emitting body that sequentially emits light of different wavelength bands for each segment region, and a light that emits light of a wavelength band different from the light emitted from the first light source and the light emitted from the light emitting body. A method of controlling the light source device, wherein the second light source includes a period in which light from the first light source is irradiated to a boundary between predetermined adjacent segment regions of the light emitting body. Is turned on.

The control method of the light source device of the present invention includes a first light source that emits light in a predetermined wavelength band, and two segment regions on a base material, and the light from the first light source is irradiated onto the plurality of segment regions. Accordingly, a light emitting body that sequentially emits light of different wavelength bands for each segment region, and a light that emits light of a wavelength band different from the light emitted from the first light source and the light emitted from the light emitting body. A light source device having two light sources, wherein the first light source emits light so as to include a period of time passing through the boundary between the two segment regions at one of the boundaries between the two segment regions. The second light source is turned on.

According to the present invention, the luminance of the screen of the light source device can be improved .

Claims (14)

A first light source that emits light of a predetermined wavelength band;
A light emitting body that has a plurality of segment regions on the base material, and sequentially emits different wavelength band light for each segment region by irradiating the plurality of segment regions with light from the first light source,
A second light source that emits light in a wavelength band different from the light emitted from the first light source and the light emitted from the light emitter;
A condensing optical system for condensing the light emitted from the light emitter and the light emitted from the second light source on the same optical path;
Light source control means for individually controlling light emission of the first light source and the second light source;
With
The light source control means turns on the second light source so as to include at least a period in which light from the first light source is applied to a boundary between predetermined adjacent segment regions of the light emitter. Light source device.   The light emitting body is a fluorescent light emitting unit having a phosphor layer in which at least one of the plurality of segment regions receives light from the first light source and emits light in a wavelength band different from the light from the first light source. The light source device according to claim 1, wherein the light source device is provided.   The light source device according to claim 1, wherein the first light source is a laser light emitter in an ultraviolet region.   4. The light source device according to claim 3, wherein the phosphor is a phosphor that emits at least a blue wavelength band light upon receiving light of the first light source, and a phosphor that emits a green wavelength band light. . The first light source is a blue wavelength band laser emitter,
3. The light source device according to claim 1, wherein at least one of the plurality of segment regions in the light emitting body is a transmission portion that transmits light from the first light source.   The light source device according to claim 5, wherein the phosphor is a phosphor that emits light of at least a green wavelength band in response to light of the first light source.   The light source device according to claim 5, wherein a diffusion layer for diffusing light from the first light source is formed in a transmission part of the light emitting body. The base material on which the phosphor layer in the fluorescent light emitting part is disposed is a transparent base material that transmits light,
The condensing optical system transmits light from the light emitting body and reflects light from the second light source at a position where the optical axis of the first light source and the optical axis of the second light source intersect. 8. The light source device according to claim 2, further comprising a dichroic mirror that reflects light from the light emitting body and transmits light from the second light source.   3. A dichroic layer that transmits light from the first light source and reflects other wavelength band light is formed on a surface of the fluorescent light emitting unit on which the phosphor layer is disposed. The light source device according to claim 8. The base material on which the phosphor layer in the fluorescent light emitting unit is disposed is a reflector having a reflecting surface that reflects light,
The condensing optical system is disposed between the first light source and the light emitting body, transmits a light of the first light source, and reflects a fluorescent light from the phosphor, and
The light of the first light source transmitted through the transmission part of the light emitting body, the fluorescent light reflected by the dichroic mirror, and the light emitted from the second light source are condensed on the same optical path and directed in the same direction. Multiple reflective mirrors and dichroic mirrors
The light source device according to claim 5, comprising:   The light source device according to any one of claims 1 to 10, wherein the second light source is a light emitting diode in a red wavelength band.   The light source device according to claim 1, wherein the light emitting body is a fluorescent wheel made of a base material capable of rotation control. The light emitter has two segment regions adjacent to each other,
The light source control means turns on the second light source when irradiating light from the first light source so as to include a period of passing through the boundary of the two segment regions at one of the boundaries of the two segment regions. A combined light obtained by combining two kinds of wavelength band light from the light emitting body and light from a second light source is emitted, and a period of passing through the boundary of the two segment regions on the other boundary of the two segment regions is 13. The light source device according to claim 12, wherein the light source device is configured to emit only light from the second light source by turning on the second light source when the first light source is turned off. A light source device, a display element, a light source side optical system that guides light from the light source device to the display element, a projection side optical system that projects an image emitted from the display element onto a screen, and the light source device And a projector control means for controlling the display element,
The projector according to claim 1, wherein the light source device is the light source device according to claim 1.

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