JP2022050838A - Light source device and projection device - Google Patents

Abstract

To provide a light source device that can be made more compact, and a projection device having the same.SOLUTION: A light source device comprises a light generation unit (101) comprising a phosphor (311), an excitation light output unit (9b), and a reflection/transmission unit (151) comprising an excitation light reflection unit 151d for reflecting excitation light L1 emitted from the excitation light output unit (9b) to the light generation unit (101), and a transmission unit 151c for transmitting light (L3) emitted from the phosphor (311).SELECTED DRAWING: Figure 4

Description

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

Today, a projection device that projects image data or the like stored in a personal computer screen, a video screen, a memory card, or the like on the screen is used. This projection device collects the light emitted from the light source on a micromirror display element called a DMD (Digital Micromirror Device) or a liquid crystal plate, and displays a color image on the screen.

For example, Patent Document 1 discloses a projection device in which a phosphor is provided in a part of a rotating wheel and is provided in a transmission region in the other part. This projection device creates green wavelength band light emitted from the phosphor by irradiating the phosphor with blue wavelength band light as excitation light, and irradiates the transmission region with blue wavelength band light, which is the opposite of the fluorescence wheel. It is configured to guide the light to the side, guide it to the same optical path as the green wavelength band light using a mirror or a lens, and then guide it to the display element.

Japanese Unexamined Patent Publication No. 2015-45778

However, a projection device such as Patent Document 1 requires a dedicated light guide region for guiding blue wavelength band light, which may increase the size of the projection device.

An object of the present invention is to provide a light source device that can be miniaturized and a projection device including a light source device.

The light source device of the present invention is from a light generation unit having a phosphor, an excitation light emission unit, an excitation light reflection unit that reflects the excitation light emitted from the excitation light emission unit to the light generation unit, and the phosphor. It is characterized by comprising a reflection transmitting portion having a transmitting portion that transmits the emitted light.

The projection device of the present invention includes the above-mentioned light source device, a display element that generates image light, a projection optical system that projects the image light emitted from the display element onto a screen, the light source device, and the display element. It is characterized by comprising a control unit for controlling the above.

According to the present invention, it is possible to provide a light source device that can be miniaturized and a projection device including a light source device.

It is a figure which shows the functional circuit block of the projection apparatus which concerns on Embodiment 1 of this invention. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a schematic plan view of (a) a fluorescent wheel and (b) a schematic plan view of a color wheel according to the first embodiment of the present invention. It is an enlarged view around the fluorescent wheel which concerns on Embodiment 1 of this invention, and shows the state which the excitation light is incident on the fluorescent light emitting region. It is a perspective view seen from the incident surface side of the 1st optical member which concerns on Embodiment 1 of this invention. It is an enlarged view around the fluorescent wheel which concerns on Embodiment 1 of this invention, and shows the state which the excitation light is made incident on the reflection region. It is a plane schematic diagram which shows the internal structure of the projection apparatus which concerns on Embodiment 2 of this invention. FIG. 2 is a schematic plan view of (a) a fluorescent screen and (b) a schematic plan view of a color wheel according to the second embodiment of the present invention. It is a figure which shows the structure of the projection apparatus which concerns on the modification of Embodiment 1 and Embodiment 2 of this invention.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described. FIG. 1 is a functional circuit block diagram of the projection device 10. The projection device control unit (control unit) is composed of 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 input / output connector unit 21 are converted 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. After that, it is output to the display encoder 24.

Further, the display encoder 24 expands 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 drive 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. The projection device 10 irradiates the display element 51 with a bundle of light rays emitted from the light source device 60 via the light guide optical system to form image light with the reflected light of the display element 51, and the projection optical system described later. The image is projected and displayed on a projected object such as a screen (not shown). The movable lens group 235 of this projection optical system can be driven by the lens motor 45 for zoom adjustment and focus adjustment.

Further, the image compression / decompression unit 31 performs a recording process of compressing the luminance signal and the color difference signal of the image signal by processing such as ADCT and Huffman coding and sequentially writing them to the memory card 32 which is a detachable recording medium. Further, the image compression / decompression unit 31 reads out the image data recorded in the memory card 32 in the reproduction mode, decompresses the individual image data constituting the series of moving images in units of one frame, and decompresses the individual image data in units of one frame, via the image conversion unit 23. Output to the display encoder 24. Therefore, the image compression / decompression unit 31 can display a moving image or the like based on the image data stored in the memory card 32.

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

The key / indicator unit 37 is composed of a main key, an indicator, and the like provided in the housing. The operation signal of the key / indicator unit 37 is sent directly to the control unit 38. Further, the key operation signal from the remote controller is received by the Ir receiving unit 35, demodulated into a code signal by the Ir processing unit 36, and output to the control unit 38.

The control unit 38 is connected to the voice processing unit 47 via the system bus SB. The voice processing unit 47 includes a sound source circuit such as a PCM sound source, converts voice data into analog in the projection mode and the reproduction mode, and drives the speaker 48 to emit loud sound.

The control unit 38 controls the light source control circuit 41. The light source control circuit 41 individually controls the operation of the excitation light irradiation device of the light source device 60 so that light in a predetermined wavelength band required at the time of image generation is emitted from the light source device 60. Further, the light source control circuit 41 controls the synchronization timing of the fluorescent wheel 101 and the color wheel 201 (see FIG. 2 and the like) according to the instruction of the control unit 38.

Further, the control unit 38 causes the cooling fan drive control circuit 43 to detect the temperature by a plurality of temperature sensors provided in the light source device 60 or the like, and controls the rotation speed of the cooling fan from the result of the temperature detection. Further, the control unit 38 keeps the cooling fan rotating even after the power of the projection device 10 is turned off by a timer or the like in the cooling fan drive control circuit 43, or the power supply of the projection device 10 is based on the result of temperature detection by the temperature sensor. It also controls such as turning off. Although the details will be described later, the projection device control unit including the control unit 38 controls the blue laser diode 71 (excitation light source), the red light emitting diode 121, the fluorescence wheel 101 and the color wheel 201, and has a red, blue and green wavelength band. Each light including is emitted in a time division.

FIG. 2 is a schematic plan view showing the internal structure of the projection device 10. The projection device 10 includes a control circuit board 241 in the vicinity of the right panel 14. The control circuit board 241 includes a power supply circuit block, a light source control block, and the like. Further, the projection device 10 includes a light source device 60, a light source optical system 170, and a projection optical system 220 on the left side of the control circuit board 241.

The light source device 60 includes an excitation light irradiation device 70 which is a light source of blue wavelength band light and a light source of excitation light, a green light source device 80 which is a light source of green wavelength band light, and a red light source which is a light source of red wavelength band light. A light source device 120 and a color wheel device 200 are provided. The green light source device 80 includes an excitation light irradiation device 70 and a fluorescence wheel device 100.

A light guide optical system 140 that guides each light is arranged in the light source device 60. The light guide optical system 140 guides the light emitted from the excitation light irradiation device 70, the green light source device 80, and the red light source device 120 to the light source optical system 170.

The excitation light irradiation device 70 can be arranged at an arbitrary position inside the projection device 10, and in the present embodiment, it is arranged near the center of the projection device 10. The excitation light irradiation device 70 includes a blue laser diode 71 which is a semiconductor light emitting device. A collimator lens 73 that converts light into parallel light is arranged on the optical axis of the blue laser diode 71 so as to enhance the directivity of the light emitted from the blue laser diode 71.

Further, on the optical axis of the blue laser diode 71 and the collimator lens 73, an incident portion 9a of the optical fiber 9 for guiding the blue wavelength band light (excitation light) emitted from the blue laser diode 71 is arranged. Although FIG. 2 shows an example in which one blue laser diode 71 is arranged, a plurality of blue laser diodes 71 may be provided to form a light source group. This light source group can be formed, for example, by arranging the blue laser diodes 71 in a matrix. When the blue wavelength band light is emitted by the plurality of blue laser diodes 71, the incident portions 9a of the plurality of optical fibers 9 can be arranged for each blue laser diode 71 on the optical axis of the collimator lens 73. ..

The optical fiber 9 has an incident portion 9a on which the blue wavelength band light emitted from the blue laser diode 71 of the excitation light irradiation device 70 is incident on one end side, and the inside of the optical fiber 9 is guided to the blue wavelength band on the other end side. It has an emission unit 9b (excitation light emission unit) from which light is emitted. In the optical fiber 9 of FIG. 2, the illustration between the incident portion 9a and the emitting portion 9b is omitted in the middle. Further, in the present embodiment, the optical fiber 9 can be arranged by an arbitrary route in the light source device 60 (or the projection device 10). A condenser lens 92 is arranged on the optical axis of the blue wavelength band light emitted from the emitting unit 9b. The condensing lens 92 is a convex lens, and condenses the blue wavelength band light emitted from the emitting portion 9b, and irradiates the incident surface 151a side (see FIG. 4) of the first optical member 151 with a reduced light beam diameter. ..

The fluorescent wheel device 100 includes a fluorescent wheel 101, a motor 110, and a first condenser lens group 150. The green light source device 80 described above is composed of an excitation light irradiation device 70 and a fluorescence wheel device 100.

Here, the configuration of the fluorescent wheel 101 (light generation unit) will be described. FIG. 3A is a schematic plan view of the fluorescent wheel 101. The fluorescent wheel 101 is formed in a disk shape and has a bearing portion 112 in the center thereof. In the fluorescent wheel 101, the bearing portion 112 is fixed to the shaft portion of the motor 110 and can rotate around the shaft portion by driving the motor 110.

The fluorescence wheel 101 has a fluorescence emission region 310 and a reflection region 320 arranged side by side in the circumferential direction. The fluorescence light emitting region 310 is formed in a C ring shape in an angle range of approximately 270 degrees, and the reflection region 320 is formed in an arc shape in the remaining angle range of approximately 90 degrees. The base material 102 of the fluorescent wheel 101 can be formed of a metal base material such as copper or aluminum. The surface 102a of the base material 102 is mirrored by silver vapor deposition or the like. The fluorescence emission region 310 has a green phosphor 311 on the surface 102a (see also the enlarged view of the P portion in FIG. 4). The green phosphor 311 is irradiated with excitation light, which is blue wavelength band light emitted from the excitation light irradiation device 70, and emits fluorescence in the green wavelength band. The fluorescence emission region 310 of the present embodiment emits the first light L3 in which the excitation light reflected on the surface 102a is slightly mixed with the fluorescence of the green wavelength band light (see also FIG. 2). The first light L3 is incident on the first optical member 151.

The reflection region 320 is formed on the surface 102a of the above-mentioned base material 102 that has been mirrored. A diffusion layer may be provided on the surface 102a in the reflection region 320. The diffusion layer can be formed by, for example, providing fine irregularities by sandblasting or the like. The excitation light L1 (blue wavelength band light) from the excitation light irradiation device 70 incident on the reflection region 320 is reflected or diffusely reflected and incident on the first optical member 151.

The first condensing lens group 150 shown in FIG. 4 has a first optical member 151 and a second optical member 152 as optical members that are condensing lenses arranged with their optical axes aligned. The first optical member 151 (reflection and transmission portion) is arranged on the front side of the first optical member 151 between the second optical member 152 and the fluorescence wheel 101. In other words, the first optical member 151 is arranged on the green phosphor 311 side with respect to the fluorescent wheel 101 so that the green phosphor 311 and the incident surface 151a side face each other. The first optical member 151 is a plano-convex lens having an incident surface 151a side flat and an emission surface 151b side convex. The first optical member 151 is formed of a transmissive portion 151c which is a translucent material such as resin or glass capable of transmitting green wavelength band light and blue wavelength band light contained in the light emitted from the fluorescent wheel 101 side.

As shown in FIG. 5, the excitation light L1 emitted from the emission portion 9b of the optical fiber 9 is reflected on the fluorescence wheel 101 side on a part of the incident surface 151a of the first optical member 151. Is provided. That is, as shown in FIG. 4, the excitation light reflection unit 151d is an incident surface 151a facing the surface 311a (or surface 102a) of the fluorescence wheel 101 (light generation unit) in the first optical member 151 (reflection transmission unit). Partially present, the transmissive portion 151c is configured to be present on the other part of the incident surface 151a facing the surface 311a (or surface 102a) of the fluorescent wheel 101 in the first optical member 151. The emission unit 9b is arranged on the side opposite to the side where the fluorescence emission region 310 (green phosphor 311) is provided with respect to the fluorescence wheel device 100 (see FIG. 4). The excitation light reflection portion 151d is arranged on the exit portion 9b side of the optical fiber 9 with respect to the central axis of the first optical member 151. Further, in the excitation light reflection unit 151d, the excitation light L1 is condensed by the condenser lens 92 (see FIG. 4) and is irradiated so that the irradiation diameter becomes a spot shape. Therefore, the excitation light reflection unit 151d can be formed with the minimum shape and size required for reflection according to the shape and size of the irradiation region of the excitation light L1. The excitation light reflection unit 151d may be configured as a dichroic mirror that reflects the wavelength component of the blue wavelength band light and transmits the wavelength component of the green wavelength band light that is the fluorescence emitted from the fluorescence emission region 310, or may be blue. It may be configured as a reflection mirror that reflects both wavelength band light and green wavelength band light. Further, the excitation light reflection unit 151d can be provided by any means such as thin film deposition or fixing of another member on the incident surface 151a of the first optical member 151.

The second optical member 152 shown in FIG. 4 is a plano-convex lens having an incident surface 152a side flat and an emission surface 152b side convex. The second optical member 152 collects the first light L3 and the second light L4 emitted from the first optical member 151 and emits them to the first dichroic mirror 141 side shown in FIG.

Returning to FIG. 2, the fluorescent wheel device 100 can be cooled by a heat sink or a cooling fan arranged in the projection device 10 (detailed configuration is not shown). The heat sink may be directly connected to the fluorescent wheel device 100 or may be connected via a heat pipe. The air blown by the cooling fan may be blown to the heat sink, or may be directly blown to the holding member to which the fluorescent wheel 101 or the motor 110 of the fluorescent wheel device 100 is attached. Further, when the fluorescence wheel 101 is arranged in an inner case accommodating an optical member included in the red light source device 120, the excitation light irradiation device 70, and the light guide optical system 140, the air blown by the cooling fan is removed. The air may be blown directly to the fluorescent wheel 101 arranged in the inner case, or the housing wall portion of the inner case in the vicinity of the fluorescent wheel 101 may be cooled from the outside.

In the present embodiment, the blue wavelength band light (second light L4) as the light source light emitted from the fluorescent wheel 101 is guided by an optical path common to other light (the first light L3 is fluorescent). The light path is common from the wheel 101, and the third light L5 has the same light path from the first dichroic mirror 141), the dedicated light path of the second light L4 can be omitted, and the light source device 60 is downsized. Or it is possible to save the occupied space in the light source device 60. Therefore, as described above, the degree of freedom in the layout for arranging the cooling components such as the heat pipe, the heat sink, and the cooling fan can be improved, and the fluorescent wheel device 100 can be easily cooled.

The red light source device 120 includes a red light emitting diode 121 which is a semiconductor light emitting element, and a second condensing lens group 125 which condenses a third light L5 which is a red wavelength band light emitted from the red light emitting diode 121. Be prepared. The second condenser lens group 125 has two condenser lenses arranged with their optical axes aligned. Each condenser lens of the second condenser lens group 125 is a plano-convex lens having a flat incident surface side and a convex exit surface side. In the red light source device 120, the optical axis of the third light L5 emitted from the red light emitting diode 121 intersects with the optical axes of the first light L3 and the second light L4 emitted from the fluorescence wheel 101 side. Is placed in.

The light guide optical system 140 includes a first dichroic mirror 141, a first condenser lens 142, and a reflection mirror 143. The first dichroic mirror 141 transmits the red wavelength band light and reflects the green wavelength band light and the blue wavelength band light. Therefore, the first dichroic mirror 141 reflects the first light L3 and the second light L4 emitted from the first condensing lens group 150 side in the direction of the first condensing lens 142, and its optical axis is 90. Convert the degree. Further, the first dichroic mirror 141 transmits the third light L5 emitted from the second condensing lens group 125 side and guides the light to the first condensing lens 142 side.

The first condensing lens 142 collects the light emitted from the first dichroic mirror 141 and guides it to the reflection mirror 143 side. The reflection mirror 143 reflects the light collected by the first condenser lens 142 and guides the light to the second condenser lens 173 side.

The light source optical system 170 includes a second condenser lens 173, a light guide device 175, a third condenser lens 178, an optical axis conversion mirror 181 and a fourth condenser lens 183, an irradiation mirror 185, and a condenser lens 195. The condenser lens 195 is also a part of the projection optical system 220 because the image light emitted from the display element 51 arranged on the rear panel 13 side of the condenser lens 195 is emitted toward the projection optical system 220.

The second condenser lens 173 is arranged between the light guide device 175 and the reflection mirror 143. The second condensing lens 173 condenses the first light L3, the second light L4, and the third light L5 guided from the reflection mirror 143. Each light collected by the second condenser lens 173 is applied to the color wheel 201 of the color wheel device 200.

The color wheel device 200 includes a color wheel 201 and a motor 210 that rotationally drives the color wheel 201. In the color wheel 201, between the second condensing lens 173 and the light guide device 175, the optical axis of the light beam emitted from the second condensing lens 173 and the irradiation surface on the color wheel 201 are orthogonal to each other. Be placed.

FIG. 3B is a schematic plan view of the color wheel 201. The color wheel 201 is formed in a disk shape and has a bearing portion 113 in the center thereof. In the color wheel 201, the bearing portion 113 is fixed to the shaft portion of the motor 210 and can rotate around the shaft portion by driving the motor 210.

The color wheel 201 has a green transmission region 410 and an all-color transmission region 420 arranged side by side in the circumferential direction. The green transmission region 410 transmits green wavelength band light and shields blue wavelength band light by absorption or the like. The green transmission region 410 may be configured to block light in the red wavelength band. The all-color transmission region 420 can transmit blue wavelength band light, green wavelength band light, and red wavelength band light.

The color wheel 201 is formed in a disk shape by, for example, a base material 103 such as a translucent resin or glass. The green transmission region 410 can be formed by a dichroic filter coated on the base material 103 by vapor deposition or the like.

The color wheel 201 rotates in synchronization with the fluorescent wheel 101. When the first light L3 emitted from the fluorescence emission region 310 of the fluorescence wheel 101 is irradiated to the green transmission region 410 (see the irradiation region S2 in FIG. 3B), the green transmission region 410 is excited to be mixed with the first light L3. The wavelength component of the light L1 (wavelength component in the blue wavelength band) and the like are removed, the color purity is adjusted using the first light L3 as green light, and the light is transmitted to the second condenser lens 173 side.

Further, the all-color transmission region 420 includes a first transmission region 420b and a second transmission region 420r. The first transmission region 420b transmits the second light L4 emitted from the fluorescence wheel 101 to the second condenser lens 173 side. Further, the second transmission region 420r transmits the third light L5 emitted from the red light source device 120 to the second condenser lens 173 side. The first transmission region 420b may be configured to transmit blue wavelength band light to shield green wavelength band light and red wavelength band light. Further, of the all-color transmission region 420, the second transmission region 420r may be configured to transmit the red wavelength band light and shield the blue wavelength band light and the green wavelength band light.

Here, an optical path at each timing at which the first light L3, the second light L4, and the third light L5 are emitted will be described. First, the first light L3 will be described. The excitation light L1 emitted from the blue laser diode 71 of FIG. 2 is incident on the incident portion 9a of the optical fiber 9 and emitted from the emission portion 9b. As shown in FIG. 4, the excitation light L1 emitted from the emission unit 9b is condensed by the condenser lens 92 and reflected by the excitation light reflection unit 151d provided on the incident surface 151a of the first optical member 151. The light. In the present embodiment, the incident angle and the reflection angle of the excitation light L1 in the excitation light reflection unit 151d are set to about 45 °. At the timing of emitting green light as the light source of the light source device 60 (that is, the timing shown in FIG. 4 where the first light L3 is emitted from the fluorescence wheel 101), the excitation light L1 reflected by the excitation light reflecting unit 151d The irradiation region S1 is located in the first light emission region 310g (see FIG. 3A) of the fluorescence light emission region 310 of the fluorescence wheel 101. When the fluorescence emission region 310 is irradiated with the excitation light L1, the fluorescence emission region 310 emits the incident fluorescence L2a and the reflected fluorescence L2b toward the first optical member 151.

More specifically, as shown in the enlarged view of part P in FIG. 4, a part of the incident excitation light L1a among the excitation light L1 incident on the fluorescence emission region 310 causes the electrons of the green phosphor 311 to transition to the excited state. On the other hand, the other part of the incident excitation light L1a reaches the surface 102a of the base material 102 without exciting the green phosphor 311.

Some of the excited electrons of the green phosphor 311 return to the ground state while emitting light through the radiation process, but due to internal quantum efficiency, the other part undergoes the non-radiation process and returns to the ground state without emitting light. Return to the state. Further, a part of the light emitted by the radiation process is emitted from the surface 311a of the green phosphor 311 as fluorescence L2a at the time of incident, but due to the external quantum efficiency, the other part is reflected inside the green phosphor 311. It is trapped by absorption.

Further, a part of the light emitted in all directions through the radiation process is emitted to the surface 311a side of the green phosphor 311, and the other part is also emitted to the base material 102 side. A part of the light emitted to the substrate 102 side due to the radiation process is reflected by the surface 102a and then emitted to the surface 311a side of the green phosphor 311. Therefore, the light reflected by the surface 102a of the base material 102 and emitted to the outside from the surface 311a of the green phosphor 311 is also emitted as the above-mentioned incident fluorescence L2a. On the other hand, even if the light is reflected by the surface 102a of the base material 102 and emitted to the surface 311a side of the green phosphor 311, a part of the light is confined inside the green phosphor 311 due to the external quantum efficiency. It is not emitted from the surface 311a.

Further, the incident excitation light L1a that has reached the substrate 102 side is reflected by the surface 102a and is again incident on the green phosphor 311 as the reflected excitation light L1b. A part of the reflected excitation light L1b excites the green phosphor 311 and emits the reflected fluorescence L2b from the green phosphor 311 through the same process as the incident fluorescence L2a emitted by the incident excitation light L1a. On the other hand, the other part of the reflected excitation light L1b is emitted from the green phosphor 311 to the outside without exciting the green phosphor 311. The reflected excitation light L1b emitted from the green phosphor 311 without exciting the green phosphor 311 becomes a loss in the step of emitting fluorescence (fluorescence L2a at the time of incident and fluorescence L2b at the time of reflection). Since the light emitted by the radiation process is emitted in all directions, it may be emitted in a direction other than the surface 102a side of the base material 102 (for example, a direction along the surface 102a), but it is green. As a whole, it is emitted to the surface 311a side of the green phosphor 311 due to repeated scattering or reflection by the surface 102a inside the phosphor 311.

In the present embodiment, since the surface 102a is used as the reflective surface, the reflected fluorescence L2b can be emitted by the reflected excitation light L1b, so that the excitation light L1 does not reflect on the substrate 102 side, so-called transmission type (for example, the substrate). (Excitation method) in which 102 is formed of a translucent material, the excitation light L1 is incident on the green phosphor 311 from the substrate 102 side, and the fluorescence in the green wavelength band is emitted in the same direction as the incident direction of the excitation light L1). In comparison, the conversion efficiency of fluorescence emission can be increased.

Through the above process, the first light L3 including the fluorescence L2a at the time of incident, the fluorescence L2b at the time of reflection, and the reflection excitation light L1b is emitted from the fluorescence emission region 310 to the first optical member 151. The first light L3 is incident on the transmission portion 151c from the incident surface 151a of the first optical member 151 and is emitted from the exit surface 151b. The first light L3 is transmitted through the incident surface 151a and the emitting surface 151b, and the entire light bundle is focused, and then emitted from the first optical member 151 to the second optical member 152 side.

When the excitation light reflection unit 151d is formed so as to be able to transmit green wavelength band light, a part of the wavelength component of the blue wavelength band is removed by reflection of the first light L3 incident on the excitation light reflection unit 151d. After that, it is incident on the transmission portion 151c. The wavelength component of the green wavelength band of the first light L3 is incident on the transmission portion 151c from the entire surface of the incident surface 151a. Further, even when the excitation light reflecting unit 151d can also reflect the green wavelength band light, the excitation light reflecting unit 151d is large enough to reflect the excitation light L1 which is a light bundle having a small irradiation spot diameter. Therefore, the ratio of light in the green wavelength band being shielded is small, and the influence of the first light L3 on the color purity is small.

The first light L3 emitted from the first optical member 151 is further focused by the incident surface 152a and the exit surface 152b of the second optical member 152, and is guided to the first dichroic mirror 141 of FIG. As described above, the first light L3 is guided by the first dichroic mirror 141, the first condenser lens 142 and the reflection mirror 143, and the first condenser lens 142, and is guided by the green transmission region 410 of the color wheel 201. The color purity is dimmed as green light and the light is guided to the light guide device 175.

Next, the optical path of the second light L4 will be described. The irradiation region S1 (see FIG. 3A) of the excitation light L1 reflected by the excitation light reflection unit 151d is located in the reflection region 320 of the fluorescence wheel 101. As shown in FIG. 6, the excitation light L1 applied to the reflection region 320 is reflected by the surface 102a on the surface 102a as shown in the enlarged view of the Q portion of FIG. 6, and is reflected on the first optical member 151 side as the second light L4. It is emitted. When the diffusion layer is provided on the surface 102a in the reflection region 320, the second light L4 is diffusely reflected and emitted to the first optical member 151. When the diffusion layer is not provided in the reflection region 320, the excitation light L1 applied to the reflection region 320 is on the incident surface 151a of the first optical member 151 on the opposite side of the excitation light reflection portion 151d (first in FIG. 6). It is mainly emitted to the left side of the optical member 151 with respect to the optical axis).

When the excitation light L1 is incident on the reflection region 320 from an oblique direction as in the present embodiment, the second light L4 reflected by the reflection region 320 reduces the amount of light reflected on the excitation light reflection unit 151d side. It can be configured relatively few. Therefore, it is possible to reduce the loss (decrease in efficiency) due to the second light L4 being reflected by the excitation light reflecting unit 151d.

After that, the second light L4 is guided to the color wheel 201 by the first dichroic mirror 141, the first condensing lens 142 and the reflection mirror 143, and the second condensing lens 173, similarly to the first light L3. Will be done. The second light L4 incident on the color wheel 201 passes through the first transmission region 420b of the all color transmission region 420 and is incident on the light guide device 175.

The optical path of the third light L5 will be described. The third light L5, which is the red wavelength band light emitted from the red light emitting diode 121 of FIG. 2, is condensed by each condenser lens of the second condenser lens group 125, and the first dichroic mirror 141, the first. The light is guided to the color wheel 201 by the condenser lens 142, the reflection mirror 143, and the second condenser lens 173. The third light L5 incident on the color wheel 201 passes through the second transmission region 420r of the all color transmission region 420 and is incident on the light guide device 175. At the timing of emitting red light as the light source of the light source device 60 (that is, the timing of emitting the third light L5 from the red light source device 120), the irradiation region S1 is among the fluorescence emission regions 310 of the fluorescence wheel 101. Although it is located in the second light emitting region 310r (see FIG. 3A), the emission of the excitation light L1 is stopped from the excitation light irradiation device 70, so that no light is emitted from the fluorescence wheel 101.

The first light L3, the second light L4, and the third light L5 transmitted through the color wheel 201 are light guide devices as green wavelength band light, blue wavelength band light, and red wavelength band light having relatively high color purity, respectively. It is guided to 175. As the light guide device 175, for example, a microlens array or a light tunnel can be arranged. The intensity distribution of the light bundles of the first light L3, the second light L4, and the third light L5 incident on the light guide device 175 is made uniform by the light guide device 175. A third condenser lens 178 is arranged on the optical axis on the back panel 13 side of the light guide device 175. An optical axis conversion mirror 181 is arranged on the rear panel 13 side of the third condenser lens 178. The light beam bundle emitted from the light emitting portion of the light guide device 175 is focused by the third condenser lens 178 and then reflected by the optical axis conversion mirror 181 to the fourth condenser lens 183 on the left panel 15 side. ..

The light beam bundle emitted from the optical axis conversion mirror 181 is focused by the fourth condenser lens 183, and then is irradiated to the display element 51 by the irradiation mirror 185 via the condenser lens 195 at a predetermined angle. A heat sink 190 is provided on the back panel 13 side of the display element 51 which is a DMD. The display element 51 is cooled by the heat sink 190.

The light from the light source irradiated on the image forming surface of the display element 51 by the light source optical system 170 forms an image light on the image forming surface of the display element 51, is reflected, and is projected onto the screen via the projection optical system 220. The light source. Here, the projection optical system 220 includes a condenser lens 195, a movable lens group 235, and a fixed lens group 225. The movable lens group 235 is movably formed by the lens motor 45. Further, the movable lens group 235 and the fixed lens group 225 are built in the fixed lens barrel. Therefore, the fixed lens barrel provided with the movable lens group 235 is a variable focus type lens, and is formed so that zoom adjustment and focus adjustment are possible.

By configuring the projection device 10 in this way, when the fluorescent wheel 101 and the color wheel 201 are rotated synchronously and light is emitted from the excitation light irradiation device 70 and the red light source device 120 at arbitrary timings, green, blue, and red colors are emitted. Each wavelength band light is incident on the second condenser lens 173 via the light guide optical system 140, and is incident on the display element 51 via the light source optical system 170. Therefore, the display element 51 can project a color image on the screen by displaying the light of each color in a time-division manner according to the data.

In the first embodiment, since a part of the reflected excitation light L1b, which is the blue wavelength band light, is mixed with the first light L3, the component of the blue wavelength band of the reflected excitation light L1b is removed by the color wheel 201. However, when the excitation light L1 mixed with the first light L3 has relatively little influence on the formation of the image light by the display element 51 (for example, when the first light L3 does not substantially include the reflected excitation light L1b). , The color wheel device 200 may be omitted. As a result, the configuration of the projection device 10 can be simplified, the occupied area inside can be reduced, and the light source device 60 and the projection device 10 can be miniaturized.

Further, in the first embodiment, the example in which the blue wavelength band light is used as the excitation light L1 has been described, but the ultraviolet wavelength band light may be used. In this case, an ultraviolet laser diode that emits ultraviolet wavelength band light can be arranged instead of the blue laser diode 71. Then, in the fluorescence wheel 101 of FIG. 3A, a red phosphor is arranged in place of the second light emitting region 310r separated by the dotted line in the green phosphor 311, and the irradiation region S1 is irradiated to the red phosphor. Then, the red wavelength band light is emitted as the third light L5, the green phosphor is arranged in the first light emitting region 310 g separated by the dotted line in the green phosphor 311, and the irradiation region S1 becomes this green phosphor. When irradiated, the green wavelength band light may be emitted as the first light L3. At this time, instead of the red light source device 120 of FIG. 2, a blue light source device that emits blue wavelength band light is arranged as the second light L4. The blue light source device may be provided with a blue light emitting diode or a blue laser diode. Therefore, even when the ultraviolet wavelength band light is used as the excitation light L1, the dedicated optical path of the second light L4 may be a short distance section between the blue light source device and the first dichroic mirror 141, so that the light source device 60 and The projection device 10 can be miniaturized. In the example in which the ultraviolet wavelength band light is used as the excitation light L1, the optical paths of the second light L4 and the third light L5 are different from the above-mentioned example in which the blue wavelength band light is used for the excitation light L1, but the second The timing at which the light L4 and the third light L5 are emitted is the same.

Further, when ultraviolet wavelength band light is used as the excitation light L1, in the fluorescence wheel 101 of FIG. 3A, a red phosphor is arranged instead of the second emission region 310r, and a blue phosphor is arranged instead of the reflection region 320. May be arranged so that the entire circumference of the fluorescence wheel 101 is configured as a fluorescence emission region. In this case, when the excitation light L1 is irradiated to the red phosphor, the red phosphor emits the red wavelength band light, and when the excitation light L1 is irradiated to the blue phosphor, the blue phosphor emits the blue wavelength band light. be able to. Therefore, the fluorescence wheel 101 having the fluorescence emission region provided on the entire circumference can emit green wavelength band light, blue wavelength band light, and red wavelength band light in a time-divided manner, as in the red light source device 120 of FIG. The configuration of a separate light source device can be omitted. Therefore, the light source device 60 and the projection device 10 can be miniaturized.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described. FIG. 7 is a schematic plan view showing the internal structure of the projection device 10A according to the second embodiment. The projection device 10A includes a fixed fluorescent plate 100A (light generation unit) instead of the fluorescent wheel device 100 shown in FIG. 4 of the first embodiment. In the description of the second embodiment, the same reference numerals are given to the same configurations as those of the first embodiment, and the description thereof will be omitted or simplified.

The fluorescent plate 100A shown in FIG. 8A has a fluorescent light emitting region 330 in which the yellow phosphor 331 is formed. The fluorescent plate 100A is arranged on the optical axis of the first condenser lens group 150 similar to the fluorescent wheel 101 of FIG. The base material 104 of the fluorescence light emitting region 330 can be formed of a metal base material such as copper or aluminum, similarly to the fluorescence wheel 101. The surface 104a is mirror-processed by silver vapor deposition or the like. The fluorescent light emitting region 330 has a yellow phosphor 331 on the surface 104a. The yellow phosphor 331 is irradiated with the excitation light L1 which is the blue wavelength band light, and emits the fourth light L6 which is the white light in which the fluorescence in the yellow wavelength band and the reflected excitation light L1b in the blue wavelength band are mixed. Emit. The fourth light L6 includes red wavelength band light, green wavelength band light, and blue wavelength band light. The fourth light L6 is incident on the first condenser lens group 150. Similar to the fluorescent wheel 101 shown in FIG. 4 and the like, the fluorescent plate 100A is arranged so that the surface 331a (or the surface 104a) is substantially parallel to the incident surface 151a of the first optical member 151. Therefore, also in the second embodiment, the excitation light reflection unit 151d shown in FIG. 4 or the like is incident on the surface 331a (or surface 104a) of the fluorescent plate 100A (light generation unit) in the first optical member 151 (reflection transmission unit). The transmission portion 151c is present on a part of the surface 151a, and the transmission portion 151c is present on the other part of the incident surface 151a facing the surface 311a (or the surface 104a) of the fluorescent plate 100A (light generation unit) in the first optical member 151. It is composed of.

The fluorescent plate 100A can be cooled by a heat sink or a cooling fan arranged in the projection device 10 as in the fluorescent wheel device 100 of the first embodiment (detailed configuration is not shown). The heat sink may be directly connected to the fluorescent plate 100A, or may be connected via a heat pipe. The air blown by the cooling fan may be blown to the heat sink, or may be blown directly to the holding member to which the fluorescent plate 100A is attached. Further, when the fluorescent plate 100A is accommodated by an internal case accommodating an optical member included in the red light source device 120A, the excitation light irradiation device 70, and the light guide optical system 140, the air blown by the cooling fan is contained in the internal case. Air may be blown directly to the fluorescent plate 100A arranged inside, or the housing of the inner case in the vicinity of the fluorescent plate 100A may be cooled from the outside.

In the present embodiment, the fourth light L6 including the green wavelength band light, the blue wavelength band light, and the red wavelength band light is guided by a common optical path as the light source light emitted from the fluorescent plate 100A, so that the light source device 60A is used. It can be miniaturized or the occupied space in the light source device 60A can be saved. Therefore, as described above, the degree of freedom in the layout for arranging the cooling components such as the heat pipe, the heat sink, and the cooling fan can be improved, and the configuration that makes it easy to cool the fluorescent plate 100A can be adopted.

The red light source device 120A includes a red light emitting diode 121A which is a semiconductor light emitting element, and a second condensing lens group 125 which collects auxiliary light L7 which is red wavelength band light emitted from the red light emitting diode 121A. The configuration of the second condenser lens group 125 is the same as that of the first embodiment. The red light source device 120A is arranged so that the optical axis of the auxiliary light L7 emitted by the red light emitting diode 121A and the optical axis of the fourth light L6 emitted from the fluorescent plate 100A side intersect with each other.

The second dichroic mirror 141A of the light guide optical system 140 reflects the green wavelength band light and the blue wavelength band light toward the first condenser lens 142. Further, the second dichroic mirror 141A reflects the red wavelength band light contained in the fourth light L6, transmits the auxiliary light L7, and the red wavelength band light and the auxiliary light L7 contained in the fourth light L6. Is guided to the first condenser lens 142 side.

As a specific configuration example, the second dichroic mirror 141A reflects components on the short wavelength side (including green wavelength band light and blue wavelength band light) including a part of red wavelength band light, and of red wavelength band light. It can be configured to transmit a component on the long wavelength side including a part. For example, when the amount of light on the long wavelength side of the red wavelength band light contained in the fourth light L6 is small, the auxiliary light L7, which is a component on the long wavelength side of the red wavelength band light, is synthesized to form a red wavelength band. It can supplement the color purity and amount of light.

Further, as another example, the red light source device 120A may be arranged so that the irradiation points of the second dichroic mirror 141A of the optical axis of the fourth light L6 and the optical axis of the auxiliary light L7 are different from each other. For example, the second dichroic mirror 141A reflects the fourth light L6 toward the first condenser lens 142 in the region irradiated with the fourth light L6, and emits the auxiliary light L7 in the region irradiated with the auxiliary light L7. It can be configured to transmit light to the first condenser lens 142 side. Even in this case, in the second dichroic mirror 141A, the fourth light L6 and the auxiliary light L7 can be combined to supplement the color purity and light intensity of the red wavelength band light emitted from the light source device 60. can.

The projection device 10A includes a color wheel device 200A instead of the color wheel device 200 in the first embodiment. As shown in FIG. 8B, the color wheel device 200A according to the second embodiment includes a color wheel 201A formed in a disk shape. The color wheel 201A has a green transmission region 510g, a blue transmission region 510b, and a red transmission region 510r arranged side by side in the circumferential direction. A dichroic filter coated on the base material 103 by vapor deposition or the like is formed in each region of the green transmission region 510g, the blue transmission region 510b, and the red transmission region 510r to selectively transmit light in a specific wavelength band. .. The green transmission region 510g transmits green wavelength band light and shields blue wavelength band light and red wavelength band light by absorption or the like. The blue transmission region 510b transmits blue wavelength band light and shields red wavelength band light and green wavelength band light by absorption or the like. The red transmission region 510r transmits red wavelength band light and shields green wavelength band light and blue wavelength band light by absorption or the like. Therefore, when the fourth light L6 and the auxiliary light L7 are irradiated, the green transmission region 510g, the blue transmission region 510b, and the red transmission region 510r are dimmed as green light, red light, and blue light having high color purity, respectively. Then, the light is transmitted to the second condenser lens 173 side.

Here, the optical path of the fourth light L6 will be described. The excitation light L1 emitted from the blue laser diode 71 of FIG. 7 is incident on the incident portion 9a and guided by the optical fiber 9. The excitation light L1 emitted from the emission unit 9b is condensed by the condenser lens 92 and reflected by the excitation light reflection unit 151d provided on the incident surface 151a of the first optical member 151. The excitation light reflection unit 151d reflects the blue wavelength band light and transmits the green wavelength band light and the red wavelength band light. Alternatively, the excitation light reflecting unit 151d may be configured to reflect blue wavelength band light, green wavelength band light, and red wavelength band light. The excitation light L1 reflected by the excitation light reflection unit 151d irradiates the irradiation region S1 of the fluorescence emission region 330 of the fluorescent plate 100A (see FIG. 8A).

When the fluorescence emission region 330 is irradiated with the excitation light L1, the incident fluorescence and the reflected fluorescence excited by the incident excitation light and the reflected excitation light (corresponding to the incident fluorescence L2a and the reflected fluorescence L2b in FIG. 4). Fluorescence containing the above is emitted toward the first optical member 151. Further, the reflected excitation light (corresponding to the reflected excitation light L1b in FIG. 4) reflected by the fluorescence emission region 330 is also emitted toward the first optical member 151. The fluorescence emission region 330 emits a fourth light L6 including these incident fluorescence, reflection fluorescence, and reflection excitation light toward the first optical member 151 side.

In the present embodiment, the fluorescence emitted from the fluorescence emission region 330 is yellow wavelength band light including green wavelength band light and red wavelength band light. Further, the amount of the excitation light L1 reflected from the fluorescence emission region 330 can be set to be relatively larger than that of the reflected excitation light L1b of the first embodiment. Therefore, the fluorescence emission region 330 can emit the fourth light L6, which is white light mixed with the fluorescence of the yellow wavelength band light and the excitation light L1 which is the blue wavelength band light.

The fourth light L6 emitted from the fluorescence emission region 330 is focused by the first optical member 151 and the second optical member 152, and is guided to the second dichroic mirror 141A. Even when the excitation light reflection unit 151d can reflect green wavelength band light and red wavelength band light, the excitation light reflection unit 151d can reflect the excitation light L1 which is a light bundle having a small irradiation spot diameter. Since it is formed in such a large size, it is possible to reduce the influence of the reflection of the green wavelength band light and the red wavelength band light on the color purity of the fourth light L6.

The fourth light L6 is guided by a second dichroic mirror 141A, a first condensing lens 142 and a reflection mirror 143, and a second condensing lens 173, and is guided by a green transmission region 510g, a blue transmission region 510b, or a color wheel 201A. The color purity is dimmed by the red transmission region 510r and the light is guided to the light guide device 175.

At the timing of emitting green light as the light source light of the light source device 60A, the fourth light L6 is incident on the green transmission region 510 g of the color wheel 201A. The green transmission region 510g removes the components of the blue wavelength band light and the red wavelength band light from the fourth light L6, and guides the green light having dimmed color purity to the light guide device 175. Further, at the timing of emitting blue light as the light source light of the light source device 60A, the fourth light L6 is incident on the blue transmission region 510b of the color wheel 201A. The blue transmission region 510b removes the components of the red wavelength band light and the green wavelength band light from the fourth light L6, and guides the blue light whose color purity is dimmed to the light guide device 175.

Next, the optical path of the auxiliary light L7 will be described. The auxiliary light L7, which is the red wavelength band light emitted from the red light emitting diode 121A of FIG. 2, is condensed by each condenser lens of the second condenser lens group 125, and is condensed by the second dichroic mirror 141A and the first condenser. The light is guided to the color wheel 201A by the lens 142, the reflection mirror 143, and the second condensing lens 173. The auxiliary light L7 incident on the color wheel 201A passes through the red transmission region 510r and is incident on the light guide device 175.

At the timing of emitting red light as the light source light of the light source device 60, the fourth light L6 and the auxiliary light L7 are incident on the red transmission region 510r of the color wheel 201A. In the red transmission region 510r, the components of the blue wavelength band light and the green wavelength band light are removed from the fourth light L6, and the color purity is increased by the red wavelength band light component of the fourth light L6 and the auxiliary light L7. The dimmed red light is guided to the light guide device 175.

As described above, the fourth light L6 and the auxiliary light L7 incident on the color wheel 201A are time-divided as green wavelength band light, blue wavelength band light, and red wavelength band light having relatively high color purity, respectively, and are guided by the light guide device. It is guided to 175. After that, the light beam bundle emitted from the light guide device 175 is guided to the display element 51 through the same optical path as in the first embodiment, and the display element 51 displays the light of each color in a time-divided manner according to the data. , You can project a color image on the screen.

As described above, in the second embodiment, since the fixed fluorescent plate 100A is used, the light source device 60A that can be downsized as compared with the case where the fluorescent wheel device 100 is used can be configured.

In the second embodiment, when the light source device 60A emits red light as the light source light, the configuration in which the auxiliary light L7 is emitted together with the fourth light L6 which is white light has been described. If the color purity and light intensity of the contained red wavelength band light are relatively sufficient, the red light source device 120A may be omitted.

Further, in the fluorescence emission region 330, a white phosphor that emits white light is used instead of the yellow phosphor 331, or a plurality of phosphors that emit light in different wavelength bands (for example, a blue phosphor or a green phosphor). , A red fluorescent substance and a yellow fluorescent substance) may be arranged side by side to emit white light. As described above, when a white phosphor that emits white light is used instead of the yellow phosphor 331, or when white light is emitted by a plurality of phosphors, the red light source device 120A may be omitted.

Further, also in the second embodiment, ultraviolet wavelength band light may be used as the excitation light L1. In this case, an ultraviolet laser diode that emits ultraviolet wavelength band light can be arranged instead of the blue laser diode 71. Further, the fluorescent plate 100A of FIG. 8A can be configured such that a white phosphor is arranged instead of the yellow phosphor 331 to emit white light as the fourth light L6. Alternatively, a blue light source device that emits the excitation light L1 as the ultraviolet wavelength band light, emits the fourth light L6 as the yellow wavelength band light, and emits the blue wavelength band light as the auxiliary light L7 instead of the red light source device 120A of FIG. May be placed. The blue light source device may be provided with a blue light emitting diode or a blue laser diode. Then, the second dichroic mirror 141A reflects the yellow wavelength band light to the first condensing lens 142 side and transmits the blue wavelength band light to the first condensing lens 142 side, so that the color wheel 201 has a green wavelength. The fourth light L6 and the auxiliary light L7 including the band light, the red wavelength band light and the blue wavelength band light can be emitted. Therefore, even when the ultraviolet wavelength band light is used as the excitation light L1, most of the fourth light L6 and the auxiliary light L7 can be guided by a common optical path, so that the light source device 60 and the projection device 10 can be miniaturized. can do.

In each embodiment (Embodiment 1 and Embodiment 2), an example in which the excitation light emission unit is the emission unit 9b of the optical fiber 9 has been described, but the excitation light emission unit is an emission unit of a laser diode or a light emitting diode. Alternatively, the excitation light L1 emitted from the laser diode or the light emitting diode may serve as an emission unit of a condenser optical system including an optical member such as a condenser lens and a reflection mirror. That is, the light source devices 60 and 60A may be configured to guide the excitation light L1 without using the optical fiber 9.

Further, the excitation light L1 emitted from the emission unit 9b shown in FIG. 2 or FIG. 7 may be guided from another different device via the optical fiber 9. FIG. 9 is a diagram showing the configuration of the projection device 10B according to the modified example of the first embodiment or the second embodiment. The projection device 10B shows an example in which some of the internal configurations described in the projection devices 10 and 10A of FIGS. 1 to 8 are separated and arranged in separate units. The projection device 10B includes a light source unit 10B1 and a projection unit 10B2. The light source unit 10B1 accommodates an excitation light irradiation device 70 that is a part of the light source device 60B. Further, the projection unit 10B2 houses a fluorescence wheel device 100 and a red light source device 120, which are other parts of the light source device 60B, a light source optical system 170, a projection optical system 220, and the like. The light source unit 10B1 guides the excitation light L1 emitted by the excitation light irradiation device 70 into the projection unit 10B2 via the optical fiber 9. As described above in FIGS. 1 to 8, the excitation light L1 guided into the projection unit 10B2 is irradiated to the fluorescence wheel device 100 to emit light (first light L3 and second light L4). .. Further, the red light source device 120 can emit the third light L5. As a result, the light source device 60B irradiates the display element 51 (not shown) in the projection unit 10B2 with the green wavelength band light, the blue wavelength band light, and the red wavelength band light. The projection unit 10B2 emits the image light formed by the light source light applied to the display element 51 to the outside of the projection unit 10B2. In the example of FIG. 9, the image light emitted from the projection unit 10B2 is projected onto the table T1 which is the projected object.

The light source device 60B may be configured to include the fluorescence plate 100A of the second embodiment instead of the fluorescence wheel device 100 to emit the fourth light L6. Further, the light source unit 10B1 may be configured to accommodate the red light source device 120, the fluorescence wheel device 100, or the fluorescence plate 101A. Further, although detailed description of the internal configuration of the projection device 10B of FIG. 9 is omitted, if there are no restrictions on mounting, any part of the configuration of the projection device 10 or the projection device 10A may be appropriately configured on the light source unit 10B1 side. Can be included in.

As described above, the projection device 10B is configured to have the light source unit 10B1 and the projection unit 10B2 separately and guide the light by the optical fiber 9, so that the degree of freedom of layout in the space where the projection device 10B is arranged is high. Can be improved. Further, by separating the light source unit 10B1 that emits the excitation light L1 from the projection unit 10B2, the heat source, the heavy object, and the noise source can be separated. Therefore, the projection device 10B can be freely applied to various uses.

Further, the example in which the excitation light reflection unit 151d is arranged on the fluorescence wheel 101 side (or the fluorescence plate 100A side) of the first optical member 151 (reflection transmission unit) has been described, but the fluorescence wheel 101 (or the fluorescence wheel 101 of the first optical member 151) is described. Alternatively, it may be provided on the opposite side of the fluorescent plate 100A). For example, the excitation light reflection unit 151d may be provided on a part of the emission surface 151b. In this case, the excitation light L1 is incident from the incident surface 151a of the first optical member 151 and guided to the inside of the first optical member 151. After that, the excitation light L1 is reflected to the incident surface 151a side by the excitation light reflection unit 151d provided on the emission surface 151b. Then, the excitation light L1 is emitted from the incident surface 151a and guided to the fluorescent wheel 101 side (or the fluorescent plate 100A side).

Further, in each embodiment, the configuration in which the excitation light reflection unit 151d is provided on a part of the incident surface 151a of the first optical member 151 which is a condenser lens has been described. That is, the first optical member 151 described in each embodiment is provided as a single optical member having a transmission unit 151c and an excitation light reflection unit 151d. Depending on the internal configuration of the light source devices 60, 60A, 60B, a reflection transmission unit (for example, a first optical member) which is a single optical member having a transmission unit 151c and an excitation light reflection unit 151d instead of the first optical member 151. (1) A lens having a shape different from that of the optical member 151, or a dichroic mirror, a dichroic filter, a diffuser, etc.) may be provided. Further, the first member is provided with an excitation light reflection unit 151d that reflects the excitation light L1 toward the light generation unit (fluorescence wheel 101, fluorescent plate 100A), and the second member having the transmission unit 151c is the first member. As a configuration provided in the vicinity, a reflection / transmission unit may be configured including a separate first member and a second member.

Further, in the above description, the light source devices 60, 60A, 60B in the DLP (Digital Light Processing) type projection devices 10, 10A and 10B have been shown, but the configuration shown in the present embodiment is a so-called LCD (Liquid Crystal Display). ) Can also be applied to the method. For example, as the light source of the liquid crystal filter (liquid crystal panel) which is a display element arranged at three places, the light source device 60 of the first embodiment (see FIG. 2 or the like) or the light source device 60A of the second embodiment (see FIG. 7 or the like) or A light source device 60B can be used. Each light (L3, L4, L6, L7) including green wavelength band light, blue wavelength band light, and red wavelength band light emitted from the light source devices 60, 60A, and 60B is guided by the same optical path and then guided. It is dispersed into each of green wavelength band light, blue wavelength band light, and red wavelength band light by a spectroscopic unit such as a dichroic mirror or a dichroic prism. The separated green wavelength band light, blue wavelength band light, and red wavelength band light are incident on a display element corresponding to each color to form an image light for each color. Each image light can be recombined by the dichroic prism and projected onto a screen or the like as a color image.

In the light source devices 60, 60A, 60B and the projection devices 10, 10A, 10B described in the above embodiments, the light generation unit (101, 100A) in which the phosphors (311, 331) are arranged and the excitation light emission unit are included. (9b) and a reflection / transmission unit (151) are provided. The reflection transmission unit (151) is emitted from the excitation light reflection unit 151d and the phosphor (311, 331) that reflect the excitation light L1 emitted from the excitation light emission unit (9b) to the light generation unit (101, 100A). A configuration having a transmitting portion 151c for transmitting the emitted light (L3, L4, L6) has been described. The light source devices 60, 60A, 60B include green wavelength band light, blue wavelength band light, and light (L3, L4, L6) containing a part or more of red wavelength band light, thereby green wavelength band light and blue wavelength band. Many of the optical paths of light and red wavelength band light can be configured in common. Therefore, the optical path dedicated to the blue wavelength band light can be omitted, and the light source devices 60, 60A, 60B and the projection devices 10, 10A, 10B can be miniaturized.

Further, the light source device 60, 60A, wherein the reflection transmission unit (151) is arranged on the phosphor (311,331) side with respect to the light generation unit (101,100A) and is arranged to face the phosphor (311,331). In 60B, the excitation light L1 can be incidented from the front side of the light generation unit (101, 100A), and is not reflected on the substrate 102 side as described in the first embodiment, as compared with the so-called transmission type excitation method. It is possible to efficiently emit fluorescence by improving the external quantum efficiency in the fluorescence emission regions 310 and 330.

Further, in the light source devices 60, 60A, 60B in which the excitation light reflection unit 151d is arranged on the light generation unit (101, 100A) side of the reflection transmission unit (151), when the refractive index of the reflection transmission unit (151) is large, It reduces the chance that light is guided from the inside of the reflection transmission part (151) to the outside, and prevents the light utilization efficiency from being lowered by total reflection when the light is emitted from the inside of the reflection transmission part (151) to the outside. can do.

Further, the light source devices 60, 60A, 60B in which the excitation light emitting unit (9b) is arranged on the side opposite to the side where the phosphor (311, 331) is provided with respect to the light generating unit (101, 100A) are fluorescent. The excitation light L1 guided by the excitation light reflecting unit 151d while making it possible to arrange an optical member that guides the light emitted from the front side of the body (311, 331) is the surface (311a) of the phosphor (311, 331). ) Can be irradiated from the side.

Further, the excitation light reflection unit 151d is formed in a size and shape corresponding to the irradiation region of the excitation light L1 emitted from the excitation light emission unit (9b). While ensuring the reflection function of the excitation light L1 by 151d, the light (L3, L4, L6) emitted from the light generation unit (101, 100A) is reflected by minimizing the dimming by the excitation light reflection unit 151d. The light can be guided to the transmission portion (151) side.

Further, a light source device 60 further comprising an excitation light source (71), wherein the excitation light emission unit (9b) is an emission unit 9b of an optical fiber 9 that receives and guides the excitation light L1 emitted from the excitation light source (71). Since the positions of the optical paths of the excitation light L1 can be flexibly arranged in the 60A and 60B, the excitation light source (71) can be arranged at various positions with few restrictions. Therefore, the degree of freedom in designing the light source devices 60, 60A, 60B (or the projection devices 10, 10A, 10B) can be improved.

Further, the light source devices 60, 60A, and 60B, which are single optical members having the transmission unit 151c and the excitation light reflection unit 151d, include an optical system including a plurality of optical functions. It can be miniaturized.

Further, the excited light reflecting portion 151d is present on a part of the surface (incident surface 151a in the first and second embodiments) facing the light generating portion (101, 100A) of the reflecting transmitting portion (151), and the reflecting transmitting portion (151) is present. ), The light source devices 60, 60A, 60B having the transmission unit 151c present on the other part of the surface facing the light generation unit (101, 100A) face the light generation unit (101, 100A) with a simple configuration. The excitation light reflection unit 151d and the transmission unit 151c can be arranged at the position of the surface, and light can be reflected or transmitted according to the light guide direction and the wavelength.

Further, the light generation unit (101) has a fluorescent light emitting region 310 in which the phosphor (311) is formed and a reflection region 320 that reflects the excitation light L1 emitted from the excitation light emission unit (9b) in the circumferential direction. The configuration of the fluorescent wheels 101 arranged side by side has been described. The transmission unit 151c of the reflection transmission unit (151) collects and transmits the fluorescence emitted from the fluorescence emission region 310 and the excitation light L1 reflected by the reflection region 320. Therefore, the light source devices 60 and 60B can be compactly configured by guiding the fluorescence and the blue wavelength band light (reflected excitation light L1) through the same optical path.

Further, the light source devices 60, 60A, 60B remove the wavelength component of a part of the excitation light L1 reflected by the fluorescence emission region 310 from the light (L3, L6) emitted from the fluorescence emission regions 310, 330. A color wheel 201 including a transparent region (410, 510 g, 510r) is provided. Therefore, the light source devices 60, 60A, and 60B can emit light from a light source having high color purity.

Further, the light source devices 60A and 60B have a circumferential direction of a red transmission region 510r that transmits red wavelength band light, a green transmission region 510g that transmits green wavelength band light, and a blue transmission region 510b that transmits blue wavelength band light. It is equipped with a color wheel 201A arranged side by side. Further, the light generation unit (100A) has described a configuration for emitting light (L6) including wavelength components of red wavelength band light, green wavelength band light, and blue wavelength band light. As a result, the light (L6) emitted from the same light source (fluorescent plate 100A) can guide light in a plurality of wavelength bands as the light source light, so that the configuration of the light source devices 60A and 60B can be simplified. can.

Further, the light source devices 60, 60A, 60B provided with a light tunnel as a light guide device for equalizing the intensity distribution of light (L3, L4, L6) are incident with a light beam bundle having a small focusing diameter, and the diameter of the light beam bundle is increased. The configuration of the optical system can be miniaturized in terms of direction. Further, the light source devices 60, 60A, 60B provided with a microlens array as the light guide device 175 for equalizing the intensity distribution of light (L3, L4, L6) have a miniaturized optical system configuration with respect to the light guide direction of the light beam bundle. can do.

The embodiments described above are presented as examples, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

The inventions described in the first claims of the present application are described below.
[1] A light generator having a fluorescent substance and
Excited light emitting part and
An excitation light reflecting section that reflects the excitation light emitted from the excitation light emitting section to the light generation section, a reflection transmitting section having a transmitting section that transmits the light emitted from the phosphor, and a reflection transmitting section.
A light source device characterized by being provided with.
[2] The light source device according to the above [1], wherein the reflection transmitting portion is arranged on the phosphor side with respect to the light generating portion so as to face the phosphor.
[3] The light source device according to the above [2], wherein the excitation light reflection unit is arranged on the light generation unit side of the reflection transmission unit.
[4] The excitation light emitting unit is one of the above [1] to the above [3], characterized in that the excitation light emitting unit is arranged on the side opposite to the side where the phosphor is provided with respect to the light generation unit. The light source device described.
[5] The above-mentioned [1] to the above-mentioned [4], wherein the excitation light reflecting portion is formed in a size and shape corresponding to an irradiation region of the excitation light emitted from the excitation light emitting portion. The light source device according to any one of.
[6] Further equipped with an excitation light source
The light source device according to any one of the above [1] to [5], wherein the excitation light emitting unit is an emission unit of an optical fiber that guides the excitation light emitted from the excitation light source. ..
[7] The light source device according to any one of the above [1] to [6], wherein the reflection transmission portion is a single optical member having the transmission portion and the excitation light reflection portion. ..
[8] The excitation light reflection portion is present on a part of the surface of the reflection transmission portion facing the light generation portion.
The transmitting portion is present on the other part of the surface of the reflection transmitting portion facing the light generating portion.
The light source device according to the above [7].
[9] The light generation unit is a fluorescence wheel in which a fluorescence emission region in which the phosphor is formed and a reflection region that reflects the excitation light emitted from the excitation light emission unit are arranged side by side in the circumferential direction. ,
The transmission portion of the reflection transmission portion transmits the fluorescence emitted from the fluorescence emission region and the excitation light reflected by the reflection region.
The light source device according to any one of the above [1] to the above [8].
[10] It is characterized by comprising a color wheel including a transmission region in which the light emitted from the fluorescence emission region is transmitted by removing a wavelength component of the excitation light reflected by the fluorescence emission region. The light source device according to the above [9].
[11] A color wheel is provided in which a red transmission region that transmits red wavelength band light, a green transmission region that transmits green wavelength band light, and a blue transmission region that transmits blue wavelength band light are arranged side by side in the circumferential direction.
The light generation unit emits the light including the wavelength components of the red wavelength band light, the green wavelength band light, and the blue wavelength band light.
The light source device according to any one of the above [1] to the above [8].
[12] The light source device according to any one of the above [1] to [11], wherein the light tunnel or the microlens array is provided as a light guide device for equalizing the intensity distribution of the light.
[13] The light source device according to any one of the above [1] to [12] and the light source device.
Display elements that generate image light and
A projection optical system that projects the image light emitted from the display element onto a screen, and
A control unit that controls the light source device and the display element,
A projection device characterized by being equipped with.

9 Optical fiber 9a Incident part 9b Emission part (excitation light emission part) 10,10A, 10B Projector 10B1 Light source unit 10B2 Projection unit 12 Front panel 13 Back panel 14 Right panel 15 Left panel 21 Input / output connector part 22 Input / output interface 23 Image conversion unit 24 Display encoder 25 Video RAM 26 Display drive unit 31 Image compression / decompression unit 32 Memory card 35 Ir receiver 36 Ir processing unit 37 Key / indicator unit 38 Control unit 41 Light source control circuit 43 Cooling fan drive control circuit 45 Lens Motor 47 Sound processing unit 48 Speaker 51 Display element 60, 60A, 60B Light source device 70 Excitation light irradiation device 71 Blue laser diode 73 Collimeter lens 80 Green light source device 92 Condensing lens 100 Fluorescent wheel device 100A Fluorescent plate (light generator)
101 Fluorescent wheel (light generator) 102 Base material 102a Surface 103 Base material 104 Base material 104a Surface 110 Motor 112 Bearing part 113 Bearing part 120, 120A Red light source device 121, 121A Red light emitting diode 125 Second condenser lens group 140 guide Optical optical system 141, 141A 1st dichroic mirror 142 1st condensing lens 143 Reflective mirror 150 1st condensing lens group 151 1st optical member (reflection transmission part)
151a Incident surface 151b Emission surface 151c Transmitter section 151d Excitation light reflector 152 Second optical member 152a Incident surface 152b Emission surface 170 Light source optical system 173 Second condensing lens 175 Light guide device 178 Third condensing lens 181 Optical axis conversion mirror 183 Fourth condenser lens 185 Irradiation mirror 190 Heat sink 195 Condenser lens 200, 200A Color wheel device 201, 201A Color wheel 210 Motor 220 Projection optical system 225 Fixed lens group 235 Movable lens group 241 Control circuit board 310 Fluorescent emission region 310g First Light emitting area 310r Second light emitting area 311 Green phosphor 311a Surface 320 Reflecting area 330 Fluorescent light emitting area 331 Yellow phosphor 331a Surface 410 Green transmission area 420 All color transmission area 420b First transmission area 420r Second transmission area 510b Blue transmission area 510g Green transmission region 510r Red transmission region L1 Excitation light L1a Incident excitation light L1b Reflection excitation light L2a Incident fluorescence L2b Reflection fluorescence L3 First light L4 Second light L5 Third light L6 Fourth light L7 Auxiliary light S1 Irradiation area S2 Irradiation area SB system bus T1 table

Claims (13)

A light generator with a phosphor and
Excited light emitting part and
An excitation light reflecting section that reflects the excitation light emitted from the excitation light emitting section to the light generation section, a reflection transmitting section having a transmitting section that transmits the light emitted from the phosphor, and a reflection transmitting section.
A light source device characterized by being provided with. The light source device according to claim 1, wherein the reflection / transmission unit is arranged on the phosphor side with respect to the light generation unit so as to face the phosphor. The light source device according to claim 2, wherein the excitation light reflection unit is arranged on the light generation unit side of the reflection transmission unit. The light source device according to any one of claims 1 to 3, wherein the excitation light emitting unit is arranged on a side opposite to the side where the phosphor is provided with respect to the light generation unit. The invention according to any one of claims 1 to 4, wherein the excitation light reflecting portion is formed in a size and shape corresponding to an irradiation region of the excitation light emitted from the excitation light emitting portion. Light source device. Further equipped with an excitation light source,
The light source device according to any one of claims 1 to 5, wherein the excitation light emitting unit is an emitting unit of an optical fiber that guides the excitation light emitted from the excitation light source. The light source device according to any one of claims 1 to 6, wherein the reflection transmitting portion is a single optical member having the transmitting portion and the excitation light reflecting portion. The excitation light reflection portion is present on a part of the surface of the reflection transmission portion facing the light generation portion.
The transmitting portion is present on the other part of the surface of the reflection transmitting portion facing the light generating portion.
The light source device according to claim 7. The light generation unit is a fluorescence wheel in which a fluorescence emission region in which the phosphor is formed and a reflection region that reflects the excitation light emitted from the excitation light emitting unit are arranged side by side in the circumferential direction.
The transmission portion of the reflection transmission portion transmits the fluorescence emitted from the fluorescence emission region and the excitation light reflected by the reflection region.
The light source device according to any one of claims 1 to 8. The claim is characterized by comprising a color wheel including a transmission region in which the light emitted from the fluorescence emission region is transmitted by removing a wavelength component of the excitation light reflected by the fluorescence emission region. 9. The light source device according to 9. It is equipped with a color wheel in which a red transmission region that transmits red wavelength band light, a green transmission region that transmits green wavelength band light, and a blue transmission region that transmits blue wavelength band light are arranged side by side in the circumferential direction.
The light generation unit emits the light including the wavelength components of the red wavelength band light, the green wavelength band light, and the blue wavelength band light.
The light source device according to any one of claims 1 to 8. The light source device according to any one of claims 1 to 11, wherein a light tunnel or a microlens array is provided as a light guide device for equalizing the intensity distribution of light. The light source device according to any one of claims 1 to 12.
Display elements that generate image light and
A projection optical system that projects the image light emitted from the display element onto a screen, and
A control unit that controls the light source device and the display element,
A projection device characterized by being equipped with.

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