JP5527571B2 - Light emitting device, light source device, and projector using the light source device - Google Patents

Light emitting device, light source device, and projector using the light source device Download PDF

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JP5527571B2
JP5527571B2 JP2008255275A JP2008255275A JP5527571B2 JP 5527571 B2 JP5527571 B2 JP 5527571B2 JP 2008255275 A JP2008255275 A JP 2008255275A JP 2008255275 A JP2008255275 A JP 2008255275A JP 5527571 B2 JP5527571 B2 JP 5527571B2
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light
light source
emitting
base
layer
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JP2010086815A (en
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正国 岩永
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カシオ計算機株式会社
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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00Projectors or projection-type viewers; Accessories therefor
    • G03B21/14Details
    • G03B21/20Lamp housings
    • G03B21/2006Lamp housings characterised by the light source
    • G03B21/2033LED or laser light sources
    • G03B21/204LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence

Description

  The present invention relates to a light emitting device, a light source device including a plurality of light emitting devices, 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, in such projectors, those using a high-intensity discharge lamp as the light source have been mainstream, but in recent years, development has been made to use a solid light-emitting element such as a light-emitting diode or an organic EL as the light source. Proposals have been made. For example, Japanese Patent No. 3967145 (Patent Document 1) includes a phosphor layer that converts excitation light having a wavelength of 500 nm or less emitted from a solid excitation light source into red, green, and blue wavelength band light, a solid excitation light source, and the like. Proposals have been made for projectors equipped with an image creation mechanism that creates an arbitrary image by combining light from each light emitting device.
Japanese Patent No. 3967145

  In the proposal of Patent Document 1, the three light emitting devices that emit light in the red, green, and blue wavelength bands are fixed without moving the phosphor layer that is the excitation light irradiation member in the projector. The temperature of the phosphor layer rises without changing the light irradiation position, and this causes problems such as a decrease in wavelength conversion efficiency due to the temperature rise of the phosphor and deterioration of performance over time. there were.

  The present invention has been made in view of the above-described problems of the prior art, and the temperature rise of the phosphor can be suppressed by moving the phosphor layer and changing the irradiation position of the excitation light. To provide a light emitting device capable of suppressing a decrease in light emission efficiency and maintaining performance for a long period of time, a light source device including a plurality of light emitting devices, and a projector including the light source device. It is aimed.

The present invention includes an excitation light source that has a segment region in which a phosphor layer that emits light of a predetermined wavelength band is disposed on a base material that can be moved and which irradiates a predetermined point of the phosphor layer with excitation light; A motor that rotates the base material, the base material is formed of a glass base material or a transparent resin base material in a circular shape, has the annular segment region, and the side on which the phosphor layer is disposed A dichroic layer that transmits the excitation light and reflects the wavelength band light emitted from the phosphor is formed on the surface of the substrate, and is disposed on the opposite side of the substrate from the excitation light source and in parallel with the substrate. Excitation light reflection that includes an auxiliary base material that can be driven synchronously with the base material, reflects the excitation light to the surface of the auxiliary base material that faces the base material, and transmits the wavelength band light emitted by the phosphor. layers are formed corresponding to the segment area of the substrate, said substrate The auxiliary substrate, you characterized by being spaced apart from each other so that a predetermined gap is formed between the layer and the excitation light reflecting layer of the phosphor.

  According to the present invention, this light-emitting device has a segment region in which a phosphor layer that emits light in a predetermined wavelength band is disposed on a substrate whose movement can be controlled, and is excited at a predetermined point on the phosphor layer. A phosphor layer comprising an excitation light source for irradiating light and rotating or reciprocating the substrate in a direction perpendicular to the optical axis of the excitation light source when the excitation light is emitted from the excitation light source The temperature rise of the phosphor can be suppressed by moving the excitation light and changing the irradiation position of the excitation light, and the light emitting device capable of suppressing the decrease in light emission efficiency and maintaining the performance over a long period of time A light source device including a plurality of light emitting devices and a projector including the light source device can be provided.

  The projector 10 of the best mode for carrying out the present invention includes a light source device 63, a display element 51, a cooling fan, a light source side optical system 61 that guides light from the light source device 63 to the display element 51, A projection-side optical system 62 that projects an image emitted from the display element 51 onto a screen, and a projector control unit that controls the light source device 63 and the display element 51 are provided.

  The light source device 63 includes three light emitting devices 64 that emit light having different wavelength bands, and the optical axes of the light emitting devices 64 are synthesized by the dichroic mirror 141 to form the same optical axis. is there. The light-emitting device 64 includes a circular base material 130 that can be controlled to rotate, an excitation light source 72 that irradiates a predetermined point of the phosphor layer 131 with excitation light, and a wheel motor 73 that rotates the base material 130. Further, the base member 130 has an annular segment region in which a phosphor layer 131 that receives excitation light and emits light in a predetermined wavelength band is disposed.

  The light source device 63 includes a red light emitting device 64R in which a phosphor layer 131 that emits red wavelength band light is disposed on the base material 130, and a phosphor that emits green wavelength band light on the base material 130. The green light emitting device 64G in which the layer 131 is disposed and the blue light emitting device 64B in which the phosphor layer 131 that emits light in the blue wavelength band is disposed on the base material 130 are configured.

  Further, the base material 130 of the light emitting device 64 is formed of a glass base material or a transparent resin base material, and transmits excitation light to the surface on which the phosphor layer 131 is disposed, and A dichroic layer 134 that reflects light in the wavelength band emitted by the phosphor is formed, and a non-reflective coating layer 133 is formed on the surface opposite to the side on which the phosphor layer 131 is disposed.

  The excitation light source 72 of each light emitting device 64 is a light emitting diode or laser emitter that emits ultraviolet wavelength band light having a shorter wavelength than the red, green, and blue wavelength band light emitted from the phosphor layer 131. Is.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a projector 10 according to one embodiment of the present invention has a substantially rectangular parallelepiped shape, and a lens cover 19 that covers a projection port on the side of a front plate 12 that is a side plate in front of a main body case. The front plate 12 is provided with a plurality of exhaust holes 17.

  The top plate 11 which is a main body case has a key / indicator unit 37. The key / indicator unit 37 includes a power switch key, a power indicator for notifying power on / off, a light source device, and the like. It is provided with keys and indicators such as an overheat indicator for notifying when overheated.

  Further, on the back of the main body case, various terminals 20 such as an input / output connector portion and a power adapter plug, etc., which are provided with a USB terminal, a D-SUB terminal for inputting image signals, an S terminal, an RCA terminal, etc. on the back plate, a memory not shown A card slot and an Ir receiver for receiving control signals from the remote controller are provided.

  The back plate, the right side plate which is a side plate of the main body case (not shown), and the lower portion of the left side plate 15 which is the side plate shown in FIG. It is.

  As shown in FIG. 2, the projector control means of the projector 10 includes a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, and the like. The image signals of various standards input from the connector unit 21 are converted so as to be unified into an image signal of a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). Thereafter, it is sent to the display encoder 24.

  The display encoder 24 develops and stores the transmitted 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.

  A display drive unit 26 to which a video signal is input from the display encoder 24 drives a display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal sent. Yes, the light from the light source device 63 is incident on the display element 51 through the illumination unit that forms the light source side optical system, thereby forming a light image with the reflected light of the display element 51 and forming the projection side optical system. The movable lens group 97 of the projection side optical system is driven for zoom adjustment and focus adjustment by a lens motor 45. .

  In addition, the image compression / decompression unit 31 performs a recording process for sequentially writing a luminance signal and a color difference signal of an image signal to a memory card 32 that is a removable recording medium by performing data compression by processing such as ADTC and Huffman coding. In the mode, the image data recorded on the memory card 32 is read, and individual image data constituting a series of moving images is expanded in units of one frame and sent to the display encoder 24 via the image conversion unit 23. A moving image or the like can be displayed based on the stored image data.

  The control unit 38 controls the 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. ing.

  Further, the operation signal of the key / indicator unit 37 composed of the main key and the indicator provided on the upper surface plate 11 of the main body case is directly sent to the control unit 38, and the key operation signal from the remote controller is received by Ir. The code signal received by the unit 35 and demodulated by the Ir processing unit 36 is sent to the control unit 38.

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

  The control unit 38 controls the power supply control circuit 41. The power supply control circuit 41 turns on the light source device 63 when the power switch key is operated. Further, the control unit 38 also controls a cooling fan drive control circuit 43. The cooling fan drive control circuit 43 performs temperature detection by a plurality of temperature sensors provided in the light source device 63, etc. The rotation speed is controlled, and the rotation of the cooling fan is continued even after the light source device 63 is turned off by a timer or the like. Further, depending on the result of temperature detection by the temperature sensor, the light source device 63 is stopped and the projector main body is stopped. Control such as turning off the power is also performed.

  Further, as shown in FIG. 3, the projector 10 has an internal structure in which a power supply control circuit board 102 to which a light source power supply circuit block 101 and the like are attached is disposed in the vicinity of the right side plate 14, and the inside of the casing is divided into partition walls 120. The air intake side space chamber 121 on the back plate 13 side and the exhaust side space chamber 122 on the front plate 12 side are formed in an airtight manner, and a sirocco fan type blower 110 is arranged as a cooling fan near the center of the projector 10, The suction port 111 of the blower 110 is positioned in the space chamber 121, and the discharge port 113 of the blower 110 is positioned in the exhaust side space chamber 122.

  Further, a light source device 63 is disposed in the exhaust side space 122, and an optical unit block 77 including an illumination side block 78, an image generation block 79, and a projection side block 80 is disposed along the left side plate 15. 77. The illumination side block 78 is communicated with the exhaust side space chamber 122 so that a part of the illumination unit provided in the illumination side block 78 is located in the exhaust side space chamber 122. An exhaust temperature reducing device 114 is disposed along the face plate 12.

  The blower 110 as a cooling fan for cooling the light source device 63 and the like has a suction port 111 in the center, the discharge port 113 has a substantially square cross section, and is connected to the partition partition 120, and the partition partition 120 Exhaust air from the blower 110 is discharged into the exhaust-side space chamber 122 partitioned by the control circuit board 103 in the vicinity of the suction port 111 of the blower 110.

  The optical unit block 77 is disposed in the vicinity of the light source device 63, and includes an illumination side block 78 that includes a part of the illumination unit and emits light emitted from the light source device 63 toward the image generation block 79, and illumination. An image generation block 79 that includes a part of the display unit 51 and the display element 51 and reflects the emitted light from the illumination side block 78 to the projection side block 80 in accordance with the image data, and a projection unit of the left side plate 15 It is composed of three blocks, a projection side block 80 which is arranged in the vicinity and projects the light reflected by the image generation block 79.

  As a part of the illumination unit forming the light source side optical system 61 provided in the illumination side block 78, there is a light guide device 75 that uses light emitted from the light source device 63 as a light flux having a uniform intensity distribution.

  Further, as a part of the illumination unit forming the light source side optical system 61 included in the image generation block 79, the reflection mirror 74 that changes the direction of the light emitted from the light guide device 75, and the reflection mirror 74 reflects the light. There is a condensing lens group 83 that condenses the emitted light on the display element 51 and an irradiation mirror 84 that irradiates the display element 51 with light transmitted through the condensing lens group 83 at a predetermined angle. The image generation block 79 also includes a display element 51, and the display element 51 employs DMD. Further, a display element heat dissipation plate 53 for cooling the display element 51 is disposed on the back plate 13 side of the display element 51.

  In this DMD, a plurality of micromirrors are arranged in a matrix, and light incident from an incident direction inclined in one direction with respect to the front direction is converted into an on-state light beam in the front direction by switching the tilt direction of the plurality of micromirrors. The image is displayed by being reflected separately from the off-state light beam in the oblique direction, and the light incident on the micromirror tilted in one tilt direction is reflected in the front direction by this micromirror and turned on. The light incident on the micromirror tilted in the other tilt direction is reflected by the micromirror in an oblique direction to form an off-state light beam, and the off-state light beam is absorbed by the light absorption plate and reflected in the front direction. The image is generated by the bright display by and the dark display by reflection in the oblique direction.

  The projection-side block 80 includes a projection unit having a fixed lens group 93 and a movable lens group 97 that form a projection-side optical system 62 that irradiates a screen or the like (not shown) with a brightly displayed light beam that forms an image. Is. The lens group of these projection-side optical systems 62 is a variable-focus lens having a zoom function, and is described above by the optical system control board 86 disposed between the optical unit block 77 and the left side plate 15. The lens motor 45 is controlled to move the movable lens group 97 along the optical axis, thereby enabling zoom adjustment and focus adjustment.

  The light source device 63 according to the present invention is composed of three light emitting devices 64 that receive excitation light from the excitation light source 72 and emit light having different wavelength bands to the light guide device 75. The red light emitting device 64R that emits light in the wavelength band, the green light emitting device 64G that emits light in the green wavelength band, and the blue light emitting device 64B that emits light in the blue wavelength band.

  The red light emitting device 64R is disposed in the vicinity of the blower outlet 113 so that the optical axis of the red light emitting device 64R is orthogonal to the optical axis of the light guide device 75, and the green light emitting device 64G is The blue light emitting device 64B is disposed in the vicinity of the front plate 12 in the vicinity of the front surface plate 12 so that the optical axis of 64G is parallel to the optical axis of the red light emitting device 64R. The optical axis is arranged so as to coincide with the optical axis of the light guide device 75.

  Further, as shown in FIG. 4, the light source device 63 includes a dichroic mirror 141 that reflects or transmits light in a predetermined wavelength band and combines the optical axes of the light emitting devices 64 to have the same optical axis, and light emission. A condensing optical system including a condensing lens that condenses the light beam emitted from the device 64 and incident on the light guide device 75 is provided.

  The condensing optical system reflects the red wavelength band light emitted from the red light emitting device 64R so as to be in the same optical axis direction as the optical axis direction of the light guide device 75, and the green light emitting device 64G and the blue light emitting device. The first dichroic mirror 141a that transmits green and blue wavelength band light emitted from 64B, and the same optical axis direction as the optical axis direction of the light guide device 75 for green wavelength band light emitted from the green light emitting device 64G A second dichroic mirror 141b that transmits the blue wavelength band light emitted from the blue light emitting device 64B, and a condenser lens group 148 that collects the light emitted from each light emitting device 64, A condensing lens 163 that condenses the light incident on the first dichroic mirror 141a via the condensing lens group 148, and a condensing lens that condenses the light incident on the light guide device 75 via the first dichroic mirror 141a. 164.

  The first dichroic mirror 141a is arranged so that the angle formed by the optical axis is 45 degrees at the position where the optical axis of the red light emitting device 64R and the light guide device 75 intersects, and the second dichroic mirror 141b. Is arranged so that the angle formed by the optical axis at the position where the green light emitting device 64G and the optical axis of the light guide device 75 intersect is 45 degrees.

  Further, the first condenser lens group 148a that condenses the light emitted from the red light emitting device 64R has a red light emitting device so that the optical axis of the first condenser lens group 148a coincides with the optical axis of the red light emitting device 64R. The second condenser lens group 148b, which is arranged between the 64R and the first condenser lens 163a and condenses the light emitted from the green light emitting device 64G, has an optical axis of the second condenser lens group 148b emitting green light. The third condenser lens group 148c, which is disposed between the green light emitting device 64G and the second dichroic mirror 141b so as to coincide with the optical axis of the device 64G and collects the emitted light from the blue light emitting device 64B, The three condenser lenses 148c are arranged between the blue light emitting device 64B and the second dichroic mirror 141b so that the optical axes of the three condenser lenses 148c coincide with the optical axis of the blue light emitting device 64B.

  The first condenser lens 163a that condenses the red light incident on the first dichroic mirror 141a via the first condenser lens group 148a has an optical axis of the first condenser lens 163a of the red light emitting device 64R. A second light is disposed between the first condenser lens group 148a and the first dichroic mirror 141a so as to coincide with the optical axis, and condenses the light incident on the first dichroic mirror 141a via the second dichroic mirror 141b. The condenser lens 163b is disposed between the first dichroic mirror 141a and the second dichroic mirror 141b so that the optical axis of the second condenser lens 163b coincides with the optical axis of the light guide device 75. . Further, the condenser lens 164 that condenses the light incident on the light guide device 75 via the first dichroic mirror 141a is arranged so that the optical axis of the condenser lens 164 coincides with the optical axis of the light guide device 75. It is arranged between the one dichroic mirror 141a and the light guide device 75.

  Each of the light emitting devices 64 includes, as shown in FIGS. 5 and 6, a light emitting wheel 71 that is rotatably arranged by a wheel motor 73 attached to a central portion of a disk-shaped base material 130 made of a transparent material, An excitation light source 72 that irradiates the phosphor contained in the phosphor layer 131 included in the light emission wheel 71 with the excitation light, and the excitation light is transmitted from the excitation light source 72 that is time-division controlled by the projector control means. When the light-emitting wheel 71 of the light-emitting device 64 is sequentially irradiated, light of a predetermined wavelength band is generated from the phosphor of the phosphor layer 131, and each color light sequentially emitted from each light-emitting device 64 passes through the above-described condensing optical system. Through the light guide device 75.

  That is, as shown in FIG. 4, the red light emitted from the red light emitting device 64R is condensed by the first condenser lens group 148a and applied to the first condenser lens 163a, and the first condenser lens 163a. After the light condensed by the light is reflected by the first dichroic mirror 141a, the light is condensed by the condenser lens 164 on the incident surface of the light guide device 75.

  The green light emitted from the green light emitting device 64G is condensed by the second condenser lens group 148b, enters the second dichroic mirror 141b, is reflected by the second dichroic mirror 141b, and then the second condenser lens. The light is condensed by 163b, irradiated to the first dichroic mirror 141a, transmitted through the first dichroic mirror 141a, and then condensed on the incident surface of the light guide device 75 by the condenser lens 164.

  Then, the blue light emitted from the blue light emitting device 64B is condensed by the third condenser lens group 148c, irradiated to the second dichroic mirror 141b, and transmitted through the second dichroic mirror 141b, and then the second condenser lens. The light is condensed by 163b, irradiated to the first dichroic mirror 141a, transmitted through the first dichroic mirror 141a, and then condensed on the incident surface of the light guide device 75 by the condenser lens 164.

  As shown in FIGS. 5 and 6, the light emitting wheel 71 includes a circular base material 130 having a phosphor layer 131 and a wheel motor 73. A circular opening corresponding to the shape of a cylindrical rotor that is a connection portion with the wheel motor 73 is formed, and the rotor is inserted into the circular opening to be integrated. Thus, the base material 130 of the light emitting wheel 71 is rotated by the wheel motor 73 that is driven and controlled by the control unit 38 of the projector control means.

  This base material 130 has one annular segment region and is formed of a glass base material or a transparent resin base material. The base material 130 has an annular phosphor layer 131 disposed in a segment region. Each phosphor layer 131 receives excitation light emitted from the excitation light source 72 and emits light in a predetermined wavelength band.

  In this way, if one annular segment region is formed on the base material 130 of the light emitting wheel 71 of each light emitting device 64 and the phosphor layer 131 that generates monochromatic light is arranged in the segment region, a small projector 10 can sufficiently secure the area of the phosphor layer 131 and can effectively suppress the temperature rise.

  The red light-emitting wheel 71R of the red light-emitting device 64R has a red phosphor layer 131 that emits red wavelength band light, which is the primary color, fixed to one surface of the segment region. A green phosphor layer 131 that emits green wavelength band light, which is the primary color, is fixed to one surface of the segment area on the green light emitting wheel 71G, and one of the segment areas of the blue light emitting wheel 71B of the blue light emitting device 64B is fixed. A blue phosphor layer 131 that emits light of a blue wavelength band as a primary color is fixed to the surface. The phosphor layer 131 is composed of a phosphor crystal and a binder.

  Then, as shown in FIG. 6, this base material 130 transmits excitation light over the entire surface on the side where the phosphor layer 131 is disposed, and other than excitation light such as wavelength band light emitted from the phosphor. A dichroic layer 134 that reflects light in other wavelength bands is formed by coating, and a phosphor layer 131 is formed on the dichroic layer 134.

  In addition, in the base material 130, a non-reflective coating layer 133 is formed by coating on the entire surface opposite to the side on which the phosphor layer 131 is disposed.

  The excitation light source 72 irradiates a predetermined point of the phosphor layer 131 disposed in the segment region of the base material 130 with excitation light, and the red, green, and blue phosphor layers of each light-emitting wheel 71 131 is a light emitting diode or laser emitter that emits ultraviolet wavelength band light, which is invisible light having a shorter wavelength than red, green, and blue wavelength band light emitted from 131. The excitation light source 72 is disposed to face each light emitting wheel 71 so as to be parallel to the rotation axis of the light emitting wheel 71, and the optical axis of the light emitted from each excitation light source 72 is the same as that of each light emitting device 64. It is the optical axis.

  The excitation light sources 72 are not limited to all having the same specification, but may be any one that can emit excitation light that generates light of a predetermined wavelength band from each phosphor. The green light emitting wheels 71R and 71G may employ an excitation light source 72 capable of emitting blue or purple wavelength band light having a shorter wavelength than the red and green wavelength bands as excitation light.

  Further, the light emitting device 64 includes an incident mask 136 having an opening formed corresponding to the shape of the light guide device 75 in order to guide the excitation light from the excitation light source 72 to a predetermined light emission wheel 71. And the light emitting wheel 71. The incident mask 136 can be omitted.

  Next, light emitted from the light emitting wheel 71 and incident on the light guide device 75 will be described. When excitation light is emitted from the excitation light source 72 to the segment region of the light emission wheel 71, the excitation light passes through the non-reflective coating layer 133 on the incident surface of the light emission wheel 71 with almost no reflection to the excitation light source 72 side. Incident on the substrate 130. The excitation light that has passed through the substrate 130 passes through the dichroic layer 134 and is irradiated onto the phosphor layer 131. The phosphor of the phosphor layer 131 absorbs the excitation light and emits light of a predetermined wavelength band in all directions. That is, red wavelength band light is emitted from the phosphor of the red phosphor layer 131 of the red light emitting device 64R, green wavelength band light is emitted from the green phosphor layer 131 of the green light emitting device 64G, and blue light is emitted. Blue wavelength band light is emitted from the blue phosphor layer 131 of the device 64B.

  The light emitted from the phosphor and incident on the condensing lens group 148 is directly incident on the light guide device 75 via the condensing optical system, and the light emitted on the base material 130 side is reflected by the dichroic layer 134. Thus, most of the reflected light is incident on the light guide device 75 as light emitted from the light emitting wheel 71.

  As shown in FIG. 4, the light guide device 75 in the present embodiment is a tapered light tunnel formed in a hollow, substantially quadrangular pyramid shape. This tapered light tunnel has four trapezoidal plates that form the top, bottom, left, and right surfaces with an entrance surface and an exit surface perpendicular to the optical axis, and by bonding and fixing each in the vicinity of the ridgeline of each plate It is formed in a substantially quadrangular frustum shape whose cross-sectional area expands from the entrance surface to the exit surface, and the inner surface is a reflection surface. In addition, by making the vertical and horizontal lengths of the exit surface approximately twice the vertical and horizontal lengths of the entrance surface of this tapered light tunnel, the incident diffused light is transferred from the exit surface to the optical axis. On the other hand, it can be set as a light beam having a spread of about 30 degrees.

  The light guide device 75 is not a tapered light tunnel, but the length of the entrance surface and the exit surface are the same length and the length of the width is the same, and a condenser lens group is arranged on the entrance surface side of the light tunnel. The diffused light emitted from the light emitting wheel 71 may be condensed by the condenser lens group and incident on the light tunnel. The light guide device 75 is not limited to the light tunnel, and a solid glass rod may be used.

  As described above, the light-emitting device 64 has a segment region in which the phosphor layer 131 that emits light in a predetermined wavelength band is disposed on the base material 130 that can be moved and controlled. Is provided with an excitation light source 72 for irradiating excitation light, and when emitting the excitation light from the excitation light source 72, the base material 130 is rotated in a direction perpendicular to the optical axis of the excitation light source 72, thereby phosphors By moving the layer 131 in the circumferential direction and changing the irradiation position of the excitation light, the temperature rise of the phosphor can be suppressed, so the decrease in luminous efficiency is suppressed and the performance is maintained over a long period of time It is possible to provide a light-emitting device 64 that can be used, a light source device 63 including a plurality of light-emitting devices 64, and a projector 10 including the light source device 63.

  The light source device 63 built in the projector 10 includes three light emitting devices 64R, 64G, and 64B that can emit light in the red, green, and blue wavelength bands. When the excitation light emitted from the excitation light source 72 of each light-emitting device 64 is sequentially blinked, the red, green, and blue wavelength band lights are sequentially incident on the light guide device 75 from each light-emitting wheel 71, and each excitation light source 72 is rotated. When the DMD, which is the display element 51 of the projector 10, displays the data in a time-sharing manner in accordance with the irradiation timing, a color image can be generated on the screen.

  Each light-emitting device 64 is not limited to being configured to sequentially blink by the projector control means, but may combine each color light and irradiate the light guide device 75. For example, if each color light is simultaneously emitted from the red, green, and blue light emitting devices 64R, 64G, and 64B, the light guide device 75 is irradiated with white light formed by combining the respective color lights, thereby improving the luminance. it can. Furthermore, it is also possible to easily adjust the hue such as the color composition by changing the lighting time ratio of red, green, and blue to increase the lighting time of a low-luminance color.

  Moreover, rigidity can be given by making the base material 130 into a glass base material, or weight reduction and cost reduction can also be achieved by making the base material 130 into a transparent resin base material.

  Since the dichroic layer 134 is formed on the surface of the base material 130 on which the phosphor layer 131 is disposed, the light emitted to the base material 130 side is reflected to the light guide device 75 side to reflect the light guide device. The amount of light incident on 75 can be increased.

  Furthermore, since the non-reflective coating layer 133 is formed on the surface of the substrate 130 opposite to the side where the phosphor layer 131 is disposed, the utilization efficiency of the excitation light emitted from the excitation light source 72 can be improved. You can also.

  Further, by adopting a light emitting diode or laser light emitter as the excitation light source 72, power consumption can be suppressed and miniaturization can be achieved as compared with a projector using a conventional discharge lamp or the like as a light source device. In addition, the excitation light source 72 that emits light in the ultraviolet wavelength band is used, and the red, green, and blue phosphor layers 131 are irradiated with the excitation light to generate red, green, and blue wavelength band light. can do.

  Further, the light emitting device 64 is not limited to the case where the light emitting device 64 is composed of the three light emitting devices 64 that generate primary wavelength red, green, and blue wavelength band light, and various combinations can be employed. For example, a light emitting device 64 that generates complementary wavelength band light such as yellow may be incorporated in the light source device 63. Thereby, the luminance of the light source device 63 can be increased to improve the color reproducibility.

  Further, the light source device 63 includes a plurality of light emitting devices 64 each having a base material 130 formed in a rectangular shape and provided with a piezoelectric element 151 that reciprocates the base material 130 in the long axis direction as shown in FIG. It is sometimes done.

  In the light emitting device 64, a rectangular segment region parallel to one side of the base material 130 is formed on the base material 130 formed in a rectangular shape, and excitation light is received on one surface of the segment region at a predetermined wavelength. It comprises a fluorescent diaphragm 150 on which a phosphor layer 131 that emits band light is disposed, and an excitation light source 72 that irradiates the phosphor with excitation light.

  The fluorescent diaphragm 150 has a piezoelectric element 151 attached to one end. The piezoelectric element 151 is connected to a control circuit. When an AC voltage is applied to the piezoelectric element 151 according to a command from the control unit 38, the piezoelectric element 151 periodically expands and contracts, thereby causing the base material 130 to Will reciprocate in the long axis direction of the segment area.

  Further, similarly to the light emitting wheel 71 described above, the fluorescent diaphragm 150 transmits excitation light to the entire surface of the base material 130 on the side where the phosphor layer 131 is disposed, and emits wavelength band light emitted from the phosphor. A reflective dichroic layer 134 is formed, and a non-reflective coating layer 133 is formed on the surface opposite to the side where the phosphor layer 131 is disposed.

  For this reason, when excitation light is irradiated to the phosphor from the excitation light source 72 disposed on the side opposite to the side on which the phosphor layer 131 is disposed, almost no light is incident on the base material 130 by the non-reflective coating layer 133. The phosphor layer 131 is irradiated without being reflected toward the excitation light source 72 side, and light of a predetermined wavelength band is emitted from the phosphor toward the condenser lens group 148 side. Further, the light emitted to the base material 130 side is reflected by the dichroic layer 134, and most of the reflected light enters the condenser lens group 148.

  In this way, by attaching the light source device 63, which includes the fluorescent diaphragm 150 and the excitation light source 72 and includes a plurality of light emitting devices 64 capable of generating wavelength band light of each color, to the projector 10, each color light is sequentially emitted. An image can be formed by irradiating the DMD. Since the fluorescent diaphragm 150 vibrates in the long axis direction, the irradiation position of the excitation light can be changed, and the temperature rise of the phosphor can be suppressed as described above.

  As shown in FIG. 8, the light emitting device 64 may be provided with an auxiliary base material 137 that can be driven synchronously with the base material 130 so as to be parallel to the base material 130. The auxiliary base material 137 is formed in a circular shape or a rectangular shape corresponding to the shape of the base material 130 on the side opposite to the excitation light source 72 side. The auxiliary base material 137 has a segment region having the same shape as the base material 130.

  As shown in FIG. 8A, the auxiliary base material 137 attached to the light emitting wheel 71 is fixed to the wheel motor 73 in the same manner as the base material 130. It rotates synchronously at the same speed. As shown in FIG. 8B, the auxiliary base material 137 attached to the fluorescent diaphragm 150 is fixed at one end to the piezoelectric element 151 like the base material 130. It vibrates synchronously with the material 130.

  The auxiliary substrate 137 is formed of a glass substrate, a transparent resin substrate, or the like, and reflects excitation light and excites wavelength band light emitted by the phosphor of the phosphor layer 131. An excitation light reflecting layer 132 that transmits light in a wavelength band other than light is formed on the entire surface of the substrate 130 side by coating, and a non-reflective coating layer 133 is coated on the entire surface opposite to the substrate 130 side. Is formed. The excitation light reflecting layer 132 on the base material 130 is formed corresponding to the segment region having the phosphor layer 131 of the base material 130, and is formed on the segment region of the auxiliary base material 137 formed in the same shape. It is good also as coating only.

  Thus, when excitation light is irradiated onto the base material 130 from the excitation light source 72, the excitation light passes through the base material 130 with almost no reflection to the excitation light source 72 side, and further passes through the dichroic layer 134 and becomes a phosphor. The layer 131 is irradiated. The phosphor layer 131 absorbs the excitation light and emits light of a predetermined wavelength band in all directions. Of these, the light emitted toward the condensing lens group 148 is incident on the auxiliary base material 137 side as it is, and the light emitted toward the base material 130 side is reflected by the dichroic layer 134, and most of the reflected light is auxiliary base material 137. It is incident on the material 137. However, there is also excitation light that passes through the phosphor layer 131 without being absorbed by the phosphor layer 131 and enters the auxiliary base material 137.

  When the excitation light is incident on the auxiliary base material 137 side, the excitation light is reflected by the excitation light reflecting layer 132 of the auxiliary base material 137, is incident on the phosphor layer 131 again, and is absorbed, and the fluorescence of the phosphor layer 131 is reflected. A predetermined wavelength band light is generated by the body, and the generated light is incident on the auxiliary base material 137. The light generated by the phosphor and incident on the auxiliary base material 137 passes through the excitation light reflecting layer 132, the auxiliary base material 137, and the non-reflective coating layer 133 and is emitted from the light emitting wheel 71 or the fluorescent diaphragm 150 to be collected. The light enters the light guide device 75 through the optical optical system.

  Thus, by arranging the auxiliary base material 137 in which the shape and the segment region corresponding to the shape of the base material 130 are formed on the side opposite to the excitation light source 72 side of the base material 130, the phosphor layer 131 is arranged. The excitation light that has passed through is reflected to the base material 130 side, is incident on the phosphor layer 131 again, is absorbed by the phosphor, and can generate light of a predetermined wavelength band. The amount of light to be increased can be increased. Further, since the non-reflective coating layer 133 is formed on the surface opposite to the substrate 130 side, the utilization efficiency of the emitted light can be improved.

  The light source device 63 of the present invention may have an auxiliary excitation light source 160 together with the excitation light source 72 as shown in FIG. 9 in order to increase the amount of light incident on the light guide device 75. In each light-emitting device 64 constituting the light source device 63, the base material 130 is disposed between the excitation light source 72 and the auxiliary excitation light source 160.

  The light source device 63 is provided with an excitation light source 72 on the side opposite to the emission surface of the substrate 130, and the auxiliary excitation light source 160 emits the excitation light emitted from the auxiliary excitation light source 160 as the phosphor of the substrate 130. A position separated from the optical axis of the excitation light source 72 by a predetermined distance so as to directly irradiate the layer 131 and not to block the light emitted from the light emitting wheel 71 and incident on the condensing optical system. Are arranged at a predetermined angle.

  Accordingly, excitation light can be irradiated from the auxiliary excitation light source 160 to the phosphor layer 131 having a relatively low wavelength conversion efficiency, and the amount of light emitted from the phosphor layer 131 is increased and incident on the light guide device 75. The amount of light can be increased. As described above, by providing the auxiliary excitation light source 160 only in the light emitting device 64 having a relatively low wavelength conversion efficiency among the plurality of light emitting devices 64, it is possible to suppress the power consumption of the entire projector 10 and to secure an optimal light amount. Can do.

  In addition, as shown in FIG. 10, the excitation light source 72 may be disposed only on the emission surface side of the base material 130. In this case, the base material 130 is formed of a transparent material such as a glass base material or a transparent resin base material. Instead, it may be formed of a heat transfer member such as a copper plate. At this time, the phosphor layer 131 is attached to the heat transfer member in the same manner as described above, and the excitation light source 72 is disposed only on the emission surface side to which the phosphor layer 131 is attached, and the entire surface on the emission surface side is silver. A reflection layer 138 is formed that reflects excitation light and each color light generated by the phosphor by vapor deposition or the like.

  As a result, the excitation light emitted from the excitation light source 72 is absorbed by the phosphor of the phosphor layer 131, and light of a predetermined wavelength band is generated by the phosphor, and the light emitted from the phosphor is guided. It can be incident on the device 75. The excitation light transmitted through the phosphor layer 131 and emitted to the heat transfer member side is reflected by the reflection layer 138 and is again absorbed by the phosphor layer 131, and is generated by the phosphor and is generated on the heat transfer member side. The emitted light can also be reflected by the reflective layer 138 and incident on the light guide device 75.

  Thus, the excitation light source 72 may be arranged only on the emission surface side of the light emission wheel 71, and the optical axis of the excitation light source 72 is not necessarily arranged so as to be parallel to the rotation axis of the light emission wheel 71. I don't need it. Therefore, since a plurality of excitation light sources 72 can be employed and the degree of freedom in arrangement can be given, the amount of light can be increased and the size can be reduced easily. Further, by using a heat transfer member such as a copper plate as the base material 130, heat can be distributed to the entire heat transfer member to effectively dissipate heat.

  A light source device 63 is configured by a plurality of light emitting devices 64 capable of emitting each color such as red, green, and blue light emitting devices 64R, 64G, and 64B in which the excitation light source 72 is disposed only on the emission surface side. If the light emitting devices 64 are arranged so that the optical axes are combined by the dichroic mirror 141 in the same manner as described above so as to have the same optical axis, each color light can be sequentially emitted from the light source device 63.

  As shown in FIG. 11, the phosphor layer 131 is formed on the light emitting wheel 71 of a predetermined light emitting device 64 or the segment region of the fluorescent diaphragm 150 among the plurality of light emitting devices 64 constituting the light source device 63. In some cases, an optical substance that imparts a diffusion effect to the irradiated wavelength band light is disposed as the diffusion layer 135 without arranging the layer.

  The light-emitting device 64 uses, for example, a light source 70 arranged in the same manner as the above-described excitation light source 72 as a light-emitting diode or laser emitter that emits light in the blue wavelength band, and diffuses excitation light from the light source 70 through the diffusion layer 135. Thus, the light can be emitted and used as it is.

  Note that the diffusion layer 135 may be formed by applying an optical process such as a roughing process such as blasting to the surface of the base material 130 in addition to fixing a solid material which is an optical substance.

  The light-emitting wheel 71 has substantially the same configuration as that of the light-emitting wheel 71 shown in FIG. 6, but the dichroic layer 134 is formed on the base material 130 in the segment region where the diffusion layer 135 is disposed. Not formed.

  Then, when excitation light that is blue wavelength band light is irradiated from the light source 70 to a predetermined point of the diffusion layer 135 disposed in the segment region, the blue light is transmitted through the non-reflective coating layer 133 and the base material 130. Then, the diffusion layer 135 is irradiated. The diffusion layer 135 emits light incident on the diffusion layer 135 as diffused light. Therefore, in the light emitting wheel 71 or the fluorescent diaphragm 150 having the segment region in which the diffusion layer 135 is formed in this way, the diffusion layer 135 that imparts this diffusion effect is formed in the annular segment region. The light from the light source 70 is incident on the light guide device 75 through the condensing optical system as blue diffused light diffused.

  In this way, the light emitted from the light source 70 is diffused, and the light-emitting device 64 can also be used as a single monochromatic light source. Therefore, the installation area of the relatively expensive phosphor layer 131 can be reduced. The inexpensive light source device 63 and the projector 10 including the light source device 63 can be provided.

  Then, the light source device 63 includes the excitation light source 72 that uses blue light as excitation light, the red light emitting device 64R in which the red phosphor layer 131 is disposed on the base material 130, and the green phosphor layer 131 on the base material 130. The green light emitting device 64G arranged and the light source 70 having the same specifications as the excitation light sources 72 provided in the red and green light emitting devices 64R and 64G are provided, and a diffusion layer 135 that imparts a diffusion effect to the base material 130 is formed. By constructing the blue light emitting device 64B, similarly to the above, red, green, and blue wavelength band light is sequentially generated from each light emitting device 64 and incident on the DMD or the like to project a color image on the screen. In addition, it is possible to provide the light source device 63 that can suppress the decrease in the light emission efficiency of each light emitting device 64 and can maintain the performance over a long period of time.

  The blue light emitting device 64B uses the light source 70 that emits light in the blue wavelength band, but the red and green light emitting devices 64R and 64G do not use the blue light source 70 as the excitation light source 72, and each has a different wavelength band light. It is also possible to provide an excitation light source 72 that emits. For example, the red light emitting device 64R may be provided with an excitation light source 72 that emits ultraviolet light, and the green light emitting device 64G may be provided with an excitation light source 72 that emits purple wavelength band light.

  The present invention is not limited to the above-described embodiments, and can be freely changed and improved without departing from the gist of the invention. For example, as a coating on the base material 130 made of a transparent material on which the phosphor layer 131 is disposed, the dichroic layer 134 is coated on the surface on which the phosphor layer 131 is disposed as described above, and the phosphor layer 131 is coated. This is not limited to the case where the non-reflective coating layer 133 is coated on the surface opposite to the side on which the layer 131 is disposed, and conversely the non-reflective coating layer 133 on the surface on which the phosphor layer 131 is disposed. The dichroic layer 134 may be coated on the opposite surface. As a result, the light emitted from the phosphor layer 131 to the substrate 130 side can be reflected by the dichroic layer 134 toward the light guide device 75 side, and the amount of light incident on the light guide device 75 can be increased. The utilization efficiency of the excitation light emitted from 72 can be improved.

1 is a perspective view showing an external appearance of a projector according to an embodiment of the invention. FIG. 3 is a diagram illustrating a functional circuit block of the projector according to the embodiment of the invention. FIG. 2 is a plan view of the projector according to the embodiment of the present invention with the top plate removed. The top view of the light source device which concerns on the Example of this invention. The perspective view which shows the external appearance of the light-emitting device which concerns on the Example of this invention. The top view which shows the partial cross section of the light-emitting device which concerns on the Example of this invention. The top view which shows the partial cross section of the light-emitting device which concerns on the Example of this invention. The top view which shows the partial cross section of the light-emitting device which concerns on the Example of this invention. The top view which shows the partial cross section of the light-emitting device which concerns on the Example of this invention. The top view which shows the partial cross section of the light-emitting device which concerns on the Example of this invention. The top view which shows the partial cross section of the light-emitting device which concerns on the Example of this invention.

Explanation of symbols

10 Projector 11 Top plate
12 Front plate 13 Back plate
14 Right side plate 15 Left side plate
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 Power supply control circuit 43 Cooling fan drive control circuit
45 Lens motor 47 Audio processor
48 Speaker 51 Display element
53 Display element heat sink 61 Light source side optical system
62 Projection-side optical system 63 Light source device
64 Light emitting device 64R Red light emitting device
64G Green light emitting device 64B Blue light emitting device
70 Light source 71 Light-emitting wheel
71R Red light emitting wheel 71G Green light emitting wheel
71B Blue light emitting wheel 72 Excitation light source
73 Wheel motor 74 Reflection mirror
75 Light guide device 77 Optical unit block
78 Lighting block 79 Image generation block
80 Projection side block 83 Condensing lens group
84 Irradiation mirror 86 Optical system control board
93 Fixed lens group 97 Movable lens group
101 Power supply circuit block for light source 102 Power supply 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 Substrate 131 Phosphor layer
132 Excitation light reflective layer 133 Non-reflective coating layer
134 Dichroic layer 135 Diffusion layer
136 Incident mask 137 Auxiliary substrate
138 Reflective layer 141 Dichroic mirror
141a 1st dichroic mirror 141b 2nd dichroic mirror
148 Condenser lens group 148a First condenser lens group
148b Second condenser lens group 148c Third condenser lens group
150 Fluorescent diaphragm 151 Piezoelectric element
160 Auxiliary excitation light source 163a First condenser lens
163b Second condenser lens 164 Condenser lens

Claims (9)

  1. An excitation light source for irradiating excitation light to a predetermined point of the phosphor layer; and the substrate. A motor that rotates, the base material is formed of a glass base material or a transparent resin base material in a circular shape, has the annular segment region, and on the surface on the side where the phosphor layer is disposed A dichroic layer that transmits the excitation light and reflects light in a wavelength band emitted by a phosphor is disposed on the opposite side of the substrate from the excitation light source and is disposed in parallel with the substrate and is synchronized with the substrate. An auxiliary base material that can be driven and controlled, and an excitation light reflection layer that reflects the excitation light and transmits the wavelength band light emitted from the phosphor on the surface of the auxiliary base material facing the base material. are formed corresponding to the segment area of wood, the accessory and the base The substrate, the light emitting apparatus characterized by being arranged separately so that a predetermined gap is formed between the layer and the excitation light reflecting layer of the phosphor.
  2. The light-emitting device according to claim 1, wherein the base material is formed of a heat transfer member, and a reflective layer is formed on a side where the phosphor layer is disposed.
  3. Each of the light emitting devices has at least three light emitting devices that emit light having different wavelength bands, and the optical axes of the light emitting devices are combined by a dichroic mirror to form the same optical axis, and at least two of the light emitting devices are claimed. A light source device according to claim 1, wherein the light source device is a light-emitting device according to claim 1.
  4. Serial wherein the at least two and are substrates of the light emitting device, to claim 3 wherein the side where the layer of phosphor is disposed, characterized in that the anti-reflective coating layer on the opposite side is formed Mounted light source device.
  5. Each of the light emitting devices has at least three light emitting devices that emit light having different wavelength bands, and the optical axes of the light emitting devices are combined by a dichroic mirror to form the same optical axis, and at least two of the light emitting devices are claimed. A light source device according to claim 1, wherein the light source device is a light-emitting device according to claim 1.
  6. Excitation light source of said at least two and have been the light-emitting device, according to any one of claims 3 to 5, characterized in that a light emitting diode or laser emitter emits a wavelength band in the ultraviolet range Light source device.
  7. Three light emitting devices are provided, and each of the three light emitting devices includes a light emitting device in which a phosphor layer that emits red wavelength band light is disposed on the base material, and a green wavelength band light on the base material. a light emitting device layers of phosphors are disposed to emit, in claim 6, wherein the layer of phosphor emitting blue wavelength band light to the substrate is the arranged light-emitting device The light source device described.
  8. One of the three light-emitting devices has a segment region in which a diffusion layer that diffuses light is disposed on a base material that can be moved, and emits blue wavelength band light at a predetermined point of the diffusion layer. The light-emitting device includes a light source for irradiation, and two of the three light-emitting devices are light-emitting diodes or laser emitters whose excitation light source emits blue wavelength band light. A light emitting device in which a phosphor layer that emits light in the red wavelength band is disposed, and a light emitting device in which a phosphor layer that emits light in the green wavelength band is disposed on the substrate. The light source device according to any one of claims 3 to 5 .
  9. 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, wherein the light source device is the light source device according to any one of claims 3 to 8 .
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JP2008052070A (en) * 2006-08-25 2008-03-06 Samsung Electronics Co Ltd Color wheel, visible light source, and projection image display device and method

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