WO2012035636A1 - 照明光学系とこれを用いたプロジェクタ - Google Patents
照明光学系とこれを用いたプロジェクタ Download PDFInfo
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- WO2012035636A1 WO2012035636A1 PCT/JP2010/066074 JP2010066074W WO2012035636A1 WO 2012035636 A1 WO2012035636 A1 WO 2012035636A1 JP 2010066074 W JP2010066074 W JP 2010066074W WO 2012035636 A1 WO2012035636 A1 WO 2012035636A1
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- phosphor
- light
- optical system
- illumination optical
- excitation light
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
- F21V9/32—Elements containing photoluminescent material distinct from or spaced from the light source characterised by the arrangement of the photoluminescent material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/12—Combinations of only three kinds of elements
- F21V13/14—Combinations of only three kinds of elements the elements being filters or photoluminescent elements, reflectors and refractors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
- F21V14/08—Controlling the distribution of the light emitted by adjustment of elements by movement of the screens or filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS 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
- G03B33/00—Colour photography, other than mere exposure or projection of a colour film
- G03B33/10—Simultaneous recording or projection
- G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
Definitions
- the present invention relates to an illumination optical system including a phosphor that emits fluorescence by excitation light from a light source, and a projector including the illumination optical system.
- LED Liquid Crystal Display
- DLP Digital Light Processing
- Patent Document 1 JP 2010-86815 discloses an illumination optical system that obtains illumination light from a phosphor by irradiating the phosphor with excitation light emitted from a laser light source.
- the irradiation spot of the excitation light is periodically moved on the phosphor by rotating or vibrating the substrate on which the phosphor is provided. Thereby, it is said that the fall of the luminous efficiency by the temperature rise is suppressed.
- Patent Document 1 during the operation of the illumination optical system, the base material provided with the phosphor always rotates or vibrates, and the drive mechanism (motor) that drives the base material always operates. Therefore, the life of the drive mechanism is short, and the life of the illumination optical system may be determined by the life of the drive mechanism. In addition, since the drive mechanism is always operating, an increase in noise or abnormal noise may occur due to wear of parts constituting the drive mechanism, for example, a bearing portion.
- the illumination optical system suppresses a reduction in life, noise, and the like due to a drive mechanism provided in the illumination optical system.
- the illumination optical system includes a light source that generates excitation light, fluorescence that is generated by irradiation of excitation light, a phosphor that is provided over a wider area than an irradiation spot of excitation light, a plate on which the phosphor is provided, and an excitation And a drive mechanism for moving the plate so that the light irradiation spot moves intermittently on the phosphor.
- the drive mechanism since the drive mechanism operates intermittently at a predetermined timing, a reduction in the life of the drive mechanism is suppressed. Further, it is possible to suppress an increase in noise due to wear of the drive mechanism and the generation of abnormal noise.
- FIG. 2 is a plan view of the phosphor unit when viewed from the left side in FIG. 1 in the right direction. It is a schematic diagram which shows the change of the relative position of the irradiation spot of excitation light, and fluorescent substance. It is a schematic diagram which shows the fluorescent substance unit with which the illumination optical system which concerns on 2nd Embodiment was equipped. A chromaticity diagram representing chromaticity coordinates (x, y) as variables is shown. It is a schematic diagram which shows the fluorescent substance unit with which the illumination optical system which concerns on 3rd Embodiment was equipped. FIG.
- FIG. 7 is a schematic diagram showing a change in relative position between an irradiation spot and a phosphor in the illumination optical system of FIG. 6. It is a schematic diagram which shows the fluorescent substance unit with which the illumination optical system which concerns on 4th Embodiment was equipped.
- FIG. 9 is a schematic diagram showing a change in relative position between an irradiation spot and a phosphor in the illumination optical system of FIG. 8. It is a schematic diagram which shows the example of a structure of the LCD projector provided with the illumination optical system. It is a schematic diagram which shows the fluorescent substance unit with which the illumination optical system which concerns on 5th Embodiment was equipped. In the illumination optical system of FIG.
- FIG. 11 it is a schematic diagram which shows the change of the relative position of an irradiation spot and fluorescent substance. It is a schematic diagram which shows the example of a structure of the DLP projector provided with the illumination optical system. It is the schematic which shows the structure of DMD. It is a schematic diagram which shows the operation
- FIG. 1 is a schematic diagram showing a configuration of an illumination optical system according to the first embodiment of the present invention.
- the illumination optical system includes a laser light source 30, a phosphor unit 10, and a drive mechanism 20.
- a laser diode (LD) is used as the laser light source 30 and generates laser light (excitation light) 32 for excitation.
- the phosphor unit 10 has a phosphor 12 and a plate 14 provided with the phosphor 12.
- the phosphor 12 generates fluorescence 18 having a wavelength longer than that of the excitation light 32 when irradiated with the excitation light 32.
- the phosphor unit 10 may be provided with a transparent sealing resin that seals the phosphor 12.
- the drive mechanism 20 moves the plate 14 provided with the phosphor 12.
- the fluorescent substance unit 10 is equipped with the heat sink 16 for cooling the fluorescent substance 12.
- the excitation light 32 that excites the phosphor 12 may be light having a wavelength shorter than that of the fluorescence 18 and is not limited to coherent light such as laser light. In this case, various light sources can be used instead of the laser light source 30.
- the light source of the excitation light 32 that excites the phosphor 12 is a laser
- the irradiation spot of the excitation light can be made a very small area, and the radiation area of the phosphor 12 is reduced.
- a highly efficient illumination optical system with a small etendue can be configured.
- the illumination optical system preferably includes a condensing optical system 36 and a dichroic mirror 38.
- the condensing optical system 36 may be composed of one condensing lens or may be composed of a plurality of lens groups.
- the dichroic mirror 38 transmits the excitation light 32 and reflects the fluorescence 18 from the phosphor 12.
- laser light 32 from a laser light source 30 passes through a dichroic mirror 38 and enters the phosphor 12 through a condensing optical system 36.
- the fluorescence 18 generated by the phosphor 12 reenters the condensing optical system 36 and is reflected by the dichroic mirror 38.
- the dichroic mirror 38 separates the path of the excitation light 32 from the laser light source 30 and the path of the fluorescence 18 from the phosphor 12.
- the dichroic mirror 38 may transmit the fluorescence 18 from the phosphor 12 and reflect the excitation light 32.
- the arrangement of the laser light source 30 is appropriately set. Further, if the path of the excitation light 32 and the path of the fluorescence 18 can be separated by irradiating the laser beam 32 obliquely toward the phosphor 12, the dichroic mirror 38 may be omitted.
- FIG. 2 is a plan view of the phosphor unit 10 as viewed from the left side to the right side in FIG.
- the plate 14 is provided with the phosphor 12 over a wider area than the excitation light irradiation spot 34.
- the phosphor 12 is preferably provided two-dimensionally wider than the excitation light irradiation spot 34.
- the drive mechanism 20 intermittently interrupts the plate 14 so that the excitation light irradiation spot 34 moves on the phosphor 12 when a predetermined time has elapsed since the excitation light started to irradiate a predetermined position of the phosphor 12.
- FIG. 3 shows an example of how the irradiation spot 34 moves on the phosphor 12.
- the drive mechanism 20 does not always operate but operates intermittently, so that the life of the drive mechanism 20 is prevented from being reduced.
- the increase in noise and the generation of abnormal noise due to wear of the parts constituting the drive mechanism 20 can also be suppressed.
- since sound is generated from the drive mechanism 20 only during driving there is an effect that the frequency of sound generation from the drive mechanism 20 is suppressed.
- the drive mechanism 20 includes a first motor 22 that moves the plate 14 along a first axis A1 in a plane in which the phosphor 12 is provided, and a second axis A2 that is orthogonal to the first axis A1. And a second motor 23 for moving the plate 14 along (see also FIG. 1).
- the plate 14 is configured to be movable two-dimensionally along the surface on which the phosphor 12 is provided. Since the irradiation spot 34 moves two-dimensionally on the phosphor 12, the lifetime of the illumination optical system can be prevented from decreasing compared to a case where the irradiation spot 34 moves one-dimensionally.
- the drive mechanism 20 is preferably provided with a conversion mechanism (not shown) or a reduction gear (not shown) that converts the rotation of the first motor 22 and the second motor 23 into a linear movement of the plate 14. These conversion mechanism and reduction gear are accommodated in the gear box 24.
- the life of the illumination optical system is improved by moving the plate 14 at a predetermined timing to change the position of the excitation light irradiation spot 34 with respect to the phosphor 12.
- the area (PW1 ⁇ PW2) of the region where the phosphor 12 is provided is 20 times the irradiation spot diameter (approximately SW1 ⁇ SW2) of the excitation light
- the lifetime of the illumination optical system is approximately the lifetime of the phosphor. 20 times.
- the lifetime of the illumination optical system can be up to 40000 hours.
- the drive mechanism 20 may be driven at regular intervals based on the lifetime of the phosphor 12. For example, the drive mechanism 20 may be driven once when the illumination optical system starts to be used, and then driven every certain time (basic time). This basic time is preferably set based on the lifetime of the phosphor 12 when the same position on the phosphor 12 is continuously irradiated with excitation light, for example. This basic time is appropriately set by an experiment conducted in advance.
- the timing for driving the drive mechanism 20 may be set based on not only the lifetime of the phosphor 12 but also the temperature of the phosphor 12 and the sealing resin. For example, when the temperature of the phosphor 12 or the sealing resin exceeds a predetermined value experimentally determined in advance, the drive mechanism 20 may be driven at a timing obtained by subtracting the predetermined value from the basic time. .
- the phosphor unit 10 preferably includes a temperature sensor 25 that measures the temperature of the phosphor 12 or the sealing resin.
- the timing for driving the drive mechanism 20 may take into account the power density of the excitation light. Specifically, when the temperature T is higher than a predetermined value and the power P of the excitation light is higher than a predetermined value with respect to the basic time H, the drive timing of the drive mechanism 20 is “H- ⁇ T- ⁇ P”. It is also good.
- ⁇ and ⁇ are positive real parameters determined in advance by experiments.
- the plate 14 is moved once every 100 hours, and when the temperature rises to 100 ° C., the plate 14 is moved once every 2 hours. .
- the timing for driving the driving mechanism 20 is appropriately set based on the lifetime of the phosphor 12, the temperature of the phosphor, the power of the excitation light, and the like in consideration of the use of the illumination optical system. Since the plate 14 provided with the phosphor does not always move but moves only at a predetermined timing, the life of the drive mechanism 20 can be extended.
- FIG. 4 shows a phosphor unit provided in the illumination optical system of the second embodiment.
- two types of phosphors 12 a and 12 b are provided on the plate 14.
- the first phosphor 12a and the second phosphor 12b emit fluorescence having a longer wavelength than the excitation light from the laser light source.
- the wavelength of the fluorescence emitted from the first phosphor 12a is different from the wavelength of the fluorescence emitted from the second phosphor 12b.
- the first and second phosphors 12a and 12b are provided over a region wider than the excitation light irradiation spot 34, respectively.
- the driving mechanism 20 moves the plate 14 at a predetermined timing so that the irradiation spot 34 of the excitation light moves on the phosphors 12a and 12b. Further, the driving mechanism 20 can move the plate 14 so that the irradiation spot 34 of the excitation light moves from the first phosphor 12a to the second phosphor 12b.
- the plate 14 moves in the vertical direction, so that the excitation light irradiation spot 34 moves between the first phosphor 12a and the second phosphor 12b. Thereby, the wavelength (color) of the light emitted from the illumination optical system can be switched.
- the first phosphor 12a emits green fluorescence corresponding to the sRGB chromaticity range
- the second phosphor 12b generates green fluorescence corresponding to the NTSC chromaticity range.
- FIG. 5 shows a chromaticity diagram representing chromaticity coordinates (x, y) as variables.
- the dotted triangles in the chromaticity diagram indicate the sRGB chromaticity region 44, and the solid triangles indicate the NTSC chromaticity region 40.
- the green light corresponding to the sRGB chromaticity region 44 is, for example, reference numeral 46 in FIG. 5, and the green light corresponding to the NTSC chromaticity region 40 is, for example, reference numeral 42 in FIG.
- red or blue light is synthesized with arbitrary intensity on the green light 42.
- the colors in the sRGB chromaticity region 44 can be reproduced by combining red or blue light with NTSC green light 42.
- the light quantity of red or blue light must always be kept large. If the illumination optical system shown in FIG. 4 is used, the sRGB green light 46 can be emitted directly by switching the fluorescence wavelength. Thereby, the light quantity of red or blue light can be suppressed. Therefore, by applying the illumination optical system described above to an apparatus such as a projector that combines light of each color to form a color image, light loss is reduced and power consumption is suppressed.
- data for video to be displayed may be analyzed, and the irradiation spot may be automatically positioned on another phosphor according to color information to be displayed.
- FIG. 6 shows a phosphor unit provided in the illumination optical system of the third embodiment.
- the illumination optical system according to the third embodiment includes a plurality of laser light sources for irradiating excitation light.
- the laser light sources are arranged in 4 columns and 5 rows. There are as many irradiation spots 34 on the phosphor 12 as there are laser light sources.
- the laser light irradiation spot 34 is further reduced by a lens, an optical fiber, or the like, the energy of light at the irradiation spot 34 becomes very large, and the temperature of the phosphor 12 rapidly increases. This may cause a problem that the phosphor deteriorates in a short time.
- the amount of light emitted from the phosphor 12 can be increased while maintaining the diameter of the irradiation spot 34 to a certain extent.
- the drive mechanism 20 intermittently shifts the relative positions of the plate 14 and the irradiation spot 12 so that the irradiation spot 34 of the excitation light moves on the phosphor 12 at a predetermined timing. Change (see FIG. 7).
- the moving range of the plate 14 or the irradiation spot 34 is a range that does not overlap with an adjacent irradiation spot, that is, a range of an area (M1 ⁇ M2) obtained by dividing the entire phosphor region by the number of laser light sources.
- the irradiation spots 34 of the excitation light are circular with a diameter of 1 mm, and the interval between the irradiation spots 34 is 10 mm.
- the plate or the irradiation spot may be moved within a range of 10 mm ⁇ 10 mm with respect to one irradiation spot. Since this area is approximately 100 times the area of the irradiation spot, the lifetime of the illumination optical system is approximately 100 times the lifetime of the phosphor 12 when the irradiation spot 34 is not moved.
- FIG. 8 shows a phosphor unit provided in the illumination optical system of the fourth embodiment.
- the illumination optical system of the fourth embodiment includes a plurality of laser light sources for irradiating excitation light, as in the third embodiment.
- two types of phosphors 12a and 12b are provided on the plate.
- the first phosphor 12a and the second phosphor 12b are arranged in a stripe shape.
- the drive mechanism intermittently changes the relative position of the plate 14 and the irradiation spot 34 so that the irradiation spot 34 of the excitation light moves on the phosphors 12a and 12b at a predetermined timing (see FIG. 9).
- the movement range of the plate or the irradiation spot is a range that does not overlap with the adjacent irradiation spot, that is, a range of the area (M1 ⁇ M2) obtained by dividing the entire phosphor region by the number of laser light sources. Within this range (M1 ⁇ M2), there are two types of phosphors 12a and 12b.
- the excitation spot 34 of the excitation light is switched between the first phosphor 12a and the second phosphor 12b. Thereby, the effect similar to the illumination optical system of 2nd Embodiment can be acquired.
- FIG. 10 is a schematic diagram showing an example of the configuration of the LCD projector.
- the illumination optical systems 10, 30, and 38 shown in FIG. 6 or FIG. 8 are used as light sources that emit green light.
- the projector further includes an LED light source 100 that emits red light and an LED light source 102 that emits blue light.
- Excitation light from the laser light source 30 of the illumination optical system is converted into parallel light by the collimating lens 104 and reflected by the dichroic mirror 38.
- the dichroic mirror 38 reflects excitation light and transmits green fluorescence.
- the light reflected by the dichroic mirror 38 is condensed on the phosphor unit 10 by the collimating lens 106.
- the phosphor emits green light when irradiated with excitation light.
- the green light is made almost parallel light by the collimating lens 106 and passes through the dichroic mirror 38.
- the green light transmitted through the dichroic mirror 38 is condensed near the reflection mirror 110 by the condenser lens 108 and reflected by the reflection mirror 110. Then, the green light spreading again is made substantially parallel light by the condenser lens 112 and is incident on the lens array 114.
- the green light incident on the lens array 114 is aligned in the polarization direction by the PS converter 116. Thereafter, the green light passes through the condenser lens 118 and the polarizing plate 120 and enters the green light LCD 122.
- the red light emitted from the LED light source 100 passes through the condenser lens 124 and enters the lens array 126.
- the red light incident on the lens array 126 is aligned in polarization direction by the PS converter 128. Thereafter, the red light passes through the condenser lens 130, is reflected by the reflection mirror 132, passes through the condenser lens 134 and the polarizing plate 136, and then enters the red LCD 138.
- Blue light emitted from the LED light source 102 passes through the condenser lens 140 and enters the lens array 142.
- the polarization direction of the red light incident on the lens array 142 is aligned by the PS converter 144. Thereafter, the blue light passes through the condenser lens 146, is reflected by the reflection mirror 148, passes through the condenser lens 150 and the polarizing plate 152, and then enters the blue LCD 154.
- Each light transmitted through the green LCD 122, the red LCD 138, and the blue LCD 154 is incident on the cross dichroic prism 158 via different polarizing plates 162, 164, 166. These lights are combined by the cross dichroic prism 158 and projected in the same direction, and imaged on the screen by the projection lens 160. In this way, a color image can be displayed on the screen.
- the illumination optical system of the above embodiment is used for green light, but the illumination optical system of the above embodiment may be used for blue light or red light. good. Further, at least one illumination optical system of the above embodiment may be used in correspondence with at least one of green light, blue light, and red light.
- a projector capable of switching between the sRGB method and the NTSC method with low light loss and low power consumption is provided. it can.
- FIG. 11 shows a phosphor unit provided in the illumination optical system of the fifth embodiment.
- the illumination optical system of the fifth embodiment includes a plurality of laser light sources for irradiating excitation light.
- the plate 14 is provided with three types of phosphors 12a, 12b, and 12c.
- the first phosphor 12a emits sBGR green light
- the second phosphor 12b emits NTSC green light
- the third phosphor 12c is a phosphor that emits red light.
- the wavelength of the laser beam for excitation is shorter than the wavelength of the light emitted from these phosphors 12a, 12b, 12c.
- the laser light sources are arranged in 4 columns and 5 rows. 10 of the 20 laser light sources are irradiated to the phosphor 12c that emits red light, and the other 10 are irradiated to the phosphors 12a and 12b that emit green light.
- the drive mechanism 20 intermittently changes the relative position of the plate 14 and the irradiation spot 34 so that the irradiation spot 34 of the excitation light moves on the phosphors 12a, 12b, and 12c at a predetermined timing (see FIG. 12). ).
- the movement range of the plate 14 or the irradiation spot 34 is a range that does not overlap with the adjacent irradiation spot 34, that is, a range of an area (M1 ⁇ M2) obtained by dividing the entire phosphor region by the number of laser light sources.
- the total of the area (M1 ⁇ M2) of the phosphor provided with the first phosphor 12a and the area (M1 ⁇ M2) provided with the second phosphor 12b is provided with the third phosphor 12c.
- the area is the same as the area (M1 ⁇ M2).
- the illumination optical system can emit either one of the green light and the red light at the same time, or can emit the light in a time division manner.
- the excitation light irradiation spot 34 moves between the first phosphor 12a and the second phosphor 12b.
- the sRGB system and the NTSC system can be switched.
- the third phosphor 12c is in a state of being irradiated with excitation light, and red light continues to be emitted.
- the illumination optical system having three types of phosphors has been described, but there may be four or more types of phosphors.
- the wavelength of the fluorescence emitted by each phosphor can be appropriately set according to the use of the illumination optical system.
- the illumination optical system may include a phosphor that emits green light, a phosphor that emits red light, and a phosphor that emits blue light.
- FIG. 13 is a schematic diagram illustrating an example of the configuration of a DLP projector.
- the DLP projector includes a digital mirror device (DMD) 200, and displays a color image by projecting red light, green light, and blue light in a time-sharing manner.
- illumination optical systems 10, 30, and 38 shown in FIG. 11 are used corresponding to green light and red light.
- An LED light source 202 is used as a light source for blue light.
- Excitation light from the excitation laser light source 30 is collimated by the collimator lens 204 and reflected by the dichroic mirror 38.
- the dichroic mirror 38 reflects the excitation light and transmits red light and green light, that is, fluorescence from the phosphor unit 10.
- the excitation light reflected by the dichroic mirror 38 is condensed on the phosphor by the collimator lens 206.
- the phosphor unit 10 includes one type of phosphor 12c that emits red light and two types of phosphors 12a and 12b that emit green light. Some of the plurality of excitation light irradiation spots 34 are positioned on the red light phosphor 12c, and the other irradiation spots 34 are positioned on one of the green light phosphors 12b or 12c.
- red light and green light are emitted.
- the emitted fluorescence is converted into substantially parallel light by the collimator lens 206 and passes through the dichroic mirror 38.
- the light that has passed through the dichroic mirror 38 passes through the condenser lens 208, is reflected by another dichroic mirror 210, passes through the condenser lens 212, and is collected near the incident end of the light tunnel 214.
- the dichroic mirror 210 transmits blue light and reflects red light and green light.
- Blue light emitted from the LED light source 202 passes through the condenser lens 216 and the dichroic mirror 210, and further passes through the condenser lens 212 to be condensed near the incident end of the light tunnel 214.
- each color incident on the light tunnel 214 is multiple-reflected in the light tunnel 214 and emitted from the light tunnel 214, then passes through the condenser lens 218 and enters the TIR prism 220.
- the light incident on the TIR prism 220 is reflected by the air gap surface 222 in the prism, changes its traveling direction, and is emitted toward the DMD 200.
- the DMD 200 includes micromirrors (micromirrors) 250 arranged in a matrix corresponding to each pixel. For simplification, only a part of the micromirrors 250 is shown in the figure.
- Each micromirror 250 is configured to be rotatable around a rotation shaft 252. In this example, the micromirror 250 rotates ⁇ 12 degrees.
- FIG. 15 shows how the micromirror 250 operates.
- Incident light 260 incident on the micromirror 250 inclined by +12 degrees is reflected in the direction in which the projection lens 224 is disposed (see FIG. 15A).
- the light incident on the projection lens 224 is projected to the outside of the projector.
- Incident light 260 incident on the micromirror 250 tilted by ⁇ 12 degrees is reflected in a direction in which the projection lens 224 is not disposed (see FIG. 15B).
- the micromirror 250 selects whether to project light corresponding to each pixel to the outside of the projector.
- the projector can project a color image.
Abstract
Description
14 プレート
18 蛍光
20 駆動機構
30 レーザ光源
32 励起光
34 励起光の照射スポット
36 集光光学系
38 ダイクロイックミラー
Claims (7)
- 励起光を発生する光源と、
前記励起光の照射により蛍光を発生し、前記励起光の照射スポットよりも広い領域にわたって設けられた蛍光体と、
前記蛍光体が設けられたプレートと、
前記励起光の照射スポットが前記蛍光体上を断続的に移動するように、前記プレートを移動させる駆動機構と、を備えた照明光学系。 - 前記駆動機構は、前記励起光の照射スポットが前記蛍光体上を二次元的に移動するように、前記プレートをX方向と、該X方向と直交するY方向とに移動させる、請求項1に記載の照明光学系。
- 前記蛍光体に対する前記励起光の照射スポットの移動のタイミングは、前記蛍光体の寿命に基づいて設定されている、請求項1または2に記載の照明光学系。
- 前記蛍光体の温度を測定する温度センサを備え、前記蛍光体に対する前記励起光の照射スポットの移動のタイミングは前記蛍光体の寿命および前記蛍光体の温度に基づいて設定されている、請求項1または2に記載の照明光学系。
- 前記蛍光体の温度を測定する温度センサを備え、前記蛍光体に対する前記励起光の照射スポットの移動のタイミングは前記蛍光体の寿命、前記蛍光体の温度および前記励起光のパワーに基づいて設定されている、請求項1または2に記載の照明光学系。
- 前記プレートには異なる波長の蛍光を発生する複数の種類の前記蛍光体が設けられており、各々の種類の前記蛍光体が前記励起光の照射スポットよりも広い領域にわたって設けられており、
前記駆動機構は、前記照射スポットが同一種類の前記蛍光体上を断続的に移動すること、および前記照射スポットが異なる種類の前記蛍光体へ移動することができるように、前記プレートを移動させる、請求項1から5のいずれか1項に記載の照明光学系。 - 請求項1から6のいずれか1項に記載の照明光学系を備えたプロジェクタ。
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JP2012533790A JP5527835B2 (ja) | 2010-09-16 | 2010-09-16 | 照明光学系とこれを用いたプロジェクタ |
US13/816,472 US9140969B2 (en) | 2010-09-16 | 2010-09-16 | Illumination optical system and projector using the same |
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