WO2016072319A1 - Light source device and image projection device - Google Patents

Light source device and image projection device Download PDF

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Publication number
WO2016072319A1
WO2016072319A1 PCT/JP2015/080224 JP2015080224W WO2016072319A1 WO 2016072319 A1 WO2016072319 A1 WO 2016072319A1 JP 2015080224 W JP2015080224 W JP 2015080224W WO 2016072319 A1 WO2016072319 A1 WO 2016072319A1
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Prior art keywords
light emitting
thz
emitting element
center frequency
light
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PCT/JP2015/080224
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French (fr)
Japanese (ja)
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裕貴 山田
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ウシオ電機株式会社
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Publication of WO2016072319A1 publication Critical patent/WO2016072319A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0239—Combinations of electrical or optical elements

Definitions

  • the present invention relates to a light source device including a plurality of light emitting elements, and also relates to an image projection device including the light source device.
  • a light source device including a plurality of light emitting elements is known as a light source device (for example, Patent Document 1).
  • speckle noise can be reduced by making the center wavelength difference of the laser beam radiate
  • an object of the present invention is to provide a light source device and an image projection device that can sufficiently reduce specs noise.
  • the light source device includes a plurality of light emitting elements, and the plurality of light emitting elements are divided into a plurality of light emitting element groups for each central frequency of each light emitting element, and are adjacent to the center frequency of the light emitting element group.
  • the center frequency difference from the center frequency of the light emitting element group is larger than the average value of the full widths at half maximum of the plurality of light emitting element groups and smaller than 11.4 THz.
  • the center frequency difference between the center frequency of the light emitting element group and the center frequency of another adjacent light emitting element group is 3.3 THz or more and 10.4 THz or less. Good.
  • the image projection device includes the light source device, and uses light emitted from the light source device as projection light.
  • the light source device and the image projection device according to the present invention have an excellent effect that specks noise can be sufficiently reduced.
  • FIG. 1 is an overall schematic diagram of an image projection apparatus according to an embodiment. It is a principal part schematic diagram of the light source device which concerns on the embodiment. It is a figure which shows the relationship between the frequency and light intensity of the light source device which concern on the embodiment. It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction
  • the dimensional ratio in the drawing does not necessarily match the actual dimensional ratio.
  • an image projection apparatus 1 includes a plurality (three in the present embodiment) of light source devices 2 (2R, 2G, 2B) that emit light of different colors, and a light source.
  • An image projection unit 10 that generates an optical image with the light from the apparatus 2 and projects the optical image onto the screen 100 is provided.
  • the image projector 1 also includes a light guide (for example, an optical fiber) 20 that propagates the light emitted from the light source device 2 and enters the image projector 10.
  • the light source device 2 includes a first light source device 2R that emits light of a first color (for example, red), a second light source device 2G that emits light of a second color (for example, green), And a third light source device 2B that emits light of three colors (for example, blue).
  • the plurality of light source devices 2 emit light of the first to third colors toward the image projection unit 10 in a separated state.
  • the image projection unit 10 receives the light emitted from each light source device 2 and generates an optical image, and the projection that projects the light image emitted from the image optical system 11 onto the screen 100.
  • An optical system for example, a projection lens
  • the image projection unit 10 includes an image projection main body unit 13 that accommodates the optical systems 11 and 12.
  • the image projection main body 13 includes a connection portion 13 a that is connected to the other end of the light guide 20.
  • the image optical system 11 includes a polarization beam splitter 11a that transmits only a predetermined polarization component of the light emitted from the light source device 2, and spatial modulation that converts the light emitted from the polarization beam splitter 11a into an optical image. And an element 11b.
  • the image optical system 11 includes a dichroic prism 11c that synthesizes the light transmitted through each spatial modulation element 11b, and a reflection mirror 11d that reflects the laser light emitted from the first and third light source devices 2R and 2B. It has.
  • each spatial modulation element 11b is a transmissive liquid crystal element.
  • the image optical system 11 may include a spatial modulation element 11b that is a reflective liquid crystal element or a digital micromirror device.
  • the light source device 2 includes a plurality of light source units 3 that emit light, an optical system 4 that receives light emitted from the plurality of light source units 3, and a main body unit 5 that houses the plurality of light source units 3 and the optical system 4. And.
  • the main body 5 includes a connecting portion 5 a that is connected to one end of the light guide 20.
  • the light source unit 3 includes a light emitting element 6 that emits light and a collimator lens 7 that converts light emitted from the light emitting element 6 into substantially parallel light.
  • each light source device 2 includes nine light emitting elements 6, which are referred to as first to ninth light emitting elements 61 to 69, respectively.
  • the light emitting element 6 is a semiconductor laser that emits laser light.
  • the semiconductor laser may be a CAN type having one emitter or an array type having a plurality of emitters.
  • the plurality of light emitting elements 61 to 69 are divided into a plurality of light emitting element groups 8 for each of the center frequencies f61 to f69 of the light emitting elements 61 to 69.
  • three light emitting element groups 8 are provided, which are referred to as first to third light emitting element groups 81 to 83, respectively.
  • the first light emitting element group 81 includes first to third light emitting elements 61 to 63
  • the second light emitting element group 82 includes fourth to sixth light emitting elements 64 to 66.
  • the third light emitting element group 83 includes seventh to ninth light emitting elements 67 to 69.
  • FIG. 3 shows the spectral distribution of light intensity with respect to frequency.
  • Dashed lines S61 to S69 indicate the spectral distribution of the light emitting elements 61 to 69
  • solid lines S81 to 83 indicate the spectral distribution of the light emitting element groups 81 to 83.
  • the light emitting elements 61 to 69 are configured so that the spectral distributions are substantially the same.
  • Each light emitting element group 81 to 83 is composed of at least one light emitting element 61 to 69 having a center frequency in a predetermined 1 THz range.
  • each light emitting element group 81 to 83 has a spectral distribution in which the frequency range of the full width at half maximum of the spectrum (frequency width at which the relative light intensity is 50% of the peak value) is separated (ie, does not overlap). Each is divided.
  • the first light-emitting element group 81 is composed of first to third light-emitting elements 61 to 63 having a center frequency in the range of 19.5 Hz from 559.5 THz to 560.5 THz. Specifically, the center frequency of the first light emitting element 61 is 560 THz, the center frequency of the second light emitting element 62 is 559.5 THz, and the center frequency of the third light emitting element 63 is 560.Hz. 5 THz.
  • the second light emitting element group 82 is composed of fourth to sixth light emitting elements 64 to 66 having a center frequency in the range of 1 THz from 563.5 THz to 564.5 THz. Specifically, the center frequency of the fourth light emitting element 64 is 564 THz, the center frequency of the fifth light emitting element 65 is 563.5 THz, and the center frequency of the sixth light emitting element 66 is 564. 5 THz.
  • the third light emitting element group 83 is composed of seventh to ninth light emitting elements 67 to 69 having a center frequency in the range of 1 THz from 567.5 THz to 568.5 THz. Specifically, the center frequency of the seventh light emitting element 67 is 568 THz, the center frequency of the eighth light emitting element 68 is 567.5 THz, and the center frequency of the ninth light emitting element 69 is 568. 5 THz.
  • the center frequency of each of the light emitting elements 61 to 69 is a frequency that is the center of the full width at half maximum of the spectrum (frequency width at which the relative light intensity is 50% of the peak value) in the spectrum distribution.
  • the center frequency of each of the light emitting elements 61 to 69 may be a peak frequency (frequency at which the relative light intensity becomes a peak value) in the spectrum distribution.
  • the center frequency differences ⁇ S12 f82c ⁇ f81c
  • ⁇ S23 the center frequencies f81c to f83c of the respective light emitting element groups 81 to 83 and the center frequencies f81c to f83c of the other adjacent light emitting element groups 81 to 83
  • ⁇ S23 the center frequencies f81c to f83c of the respective light emitting element groups 81 to 83 and the center frequencies f81c to f83c of the other adjacent light emitting element groups 81 to 83
  • F83c ⁇ f82c is 4 THz respectively.
  • the average value of the spectrum half widths ⁇ f81 to ⁇ f83 in the plurality of light emitting element groups 81 to 83 is 1.5 THz.
  • the maximum center frequency difference ⁇ W1 is a frequency difference between the maximum center frequency f83 and the minimum center frequency f81 among the center frequencies f81 to f83 of the plurality of light emitting element groups 81 to 83.
  • the configurations of the image projection device 1 and the light source device 2 according to the present embodiment are as described above. Next, with reference to FIGS. 4 to 17, regarding the operation of the image projection device 1 and the light source device 2 according to the present embodiment. To explain.
  • the speckle contrast reduction rate is the speckle contrast reduction rate with respect to the speckle contrast of one light emitting element group having a full spectrum half width of 0.2 THz.
  • the speckle contrast is calculated based on the following formula using a simulation value when the screen is irradiated with a gain of 2.4.
  • Kg represents the autocorrelation function of the spectrum
  • ⁇ represents the correlation function of speckle at two different wavelengths
  • ⁇ represents the frequency difference.
  • the full width at half maximum of each light emitting element group is the same as 0.2 THz, and the maximum center frequency difference is also the same as 30 THz.
  • the speckle contrast reduction rate was calculated by changing the center frequency difference. For example, when the center frequency difference is 15 THz, there are three light emitting element groups. When the center frequency difference is 10 THz, there are four light emitting element groups. When the center frequency difference is 5 THz, the light emitting element groups There will be seven groups.
  • FIG. 4 shows a case of 637 THz (471 nm) to 667 THz (449 nm) which is a frequency region of blue light
  • FIG. 5 shows a case of 454 THz (660 nm) to 484 THz (619 nm) of a frequency region of red light
  • FIG. 6 shows a case of 541 THz (554 nm) to 571 THz (525 nm), which is a frequency region of green light. As shown in FIGS. 4 to 6, the frequency region has little influence on the speckle contrast reduction rate.
  • the maximum center frequency difference is the same as 30 THz, and the frequency region is also the same as 541 THz to 571 THz. Under such conditions, the speckle contrast reduction rate was calculated by changing the center frequency difference.
  • FIG. 6 shows a case where the full width at half maximum of each light emitting element group is 0.2 THz
  • FIG. 7 shows a case where the full width at half maximum of each light emitting element group is 0.1 THz
  • FIG. The case where the full width at half maximum of each light emitting element group is 1.0 THz is shown.
  • FIGS. 6 to 8 there is almost no influence of the full width at half maximum of each light emitting element group on the speckle contrast reduction rate.
  • the full width at half maximum of each light emitting element group is the same as 0.2 THz.
  • the speckle contrast reduction rate was calculated by changing the center frequency difference at various maximum center frequency differences.
  • FIG. 9 shows a case where the maximum center frequency difference is 20 THz (546 THz to 566 THz).
  • the reduction rate is improved with respect to the speckle contrast reduction rate D1 of the invention according to Patent Document 1 (the invention in which the maximum center frequency difference is equal to or less than the full width at half maximum of the light emitting element). Therefore, the center frequency difference needs to be larger than 0.2 THz (average value of spectral full widths at half maximum ⁇ f81 to ⁇ f83 of the light emitting element groups 81 to 83) and smaller than 17.3 THz.
  • the center frequency difference should be 3.3 THz or more and 13.8 THz or less.
  • FIG. 10 shows a case where the maximum center frequency difference is 30 THz (541 THz to 571 THz).
  • the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum ⁇ f81 to ⁇ f83 of 83 is required to be smaller than 14.7 THz.
  • the center frequency difference should be 3.2 THz or more and 12.3 THz or less.
  • FIG. 11 shows a case where the maximum center frequency difference is 35 THz (542 THz to 577 THz).
  • the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum ⁇ f81 to ⁇ f83 of 83 is required to be larger than 14.0 THz.
  • the center frequency difference should be 3.3 THz or more and 12.2 THz or less.
  • FIG. 12 shows a case where the maximum center frequency difference is 50 THz (533 THz to 583 THz).
  • the center frequency difference is 0.2 THz (each of the light emitting element groups 81 to The spectral full width at half maximum ⁇ f81 to ⁇ f83 of 83 is required to be larger than 13.0 THz.
  • the center frequency difference should be 3.3 THz or more and 11.4 THz or less.
  • FIG. 13 shows a case where the maximum center frequency difference is 70 THz (518 THz to 588 THz).
  • the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum ⁇ f81 to ⁇ f83 of 83 is required to be smaller than 12.1 THz.
  • the center frequency difference should be 3.2 THz or more and 10.9 THz or less.
  • FIG. 14 shows a case where the maximum center frequency difference is 90 THz (510 THz to 600 THz).
  • the center frequency difference is 0.2 THz (each of the light emitting element groups 81 to The spectral full width at half maximum ⁇ f81 to ⁇ f83 of 83 is required to be larger than 11.5 THz.
  • the center frequency difference should be 3.0 THz or more and 10.5 THz or less.
  • FIG. 15 shows a case where the maximum center frequency difference is 100 THz (500 THz to 600 THz).
  • the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum ⁇ f81 to ⁇ f83 of 83 is required to be larger than 11.4 THz.
  • the center frequency difference should be 2.7 THz or more and 10.4 THz or less.
  • FIG. 16 shows the range of the center frequency difference having a reduction rate larger than the speckle contrast reduction rate D1 of the invention according to Patent Document 1 in a hatched area.
  • the center frequency difference ⁇ S12, ⁇ S23 between the adjacent light emitting element groups 81, 82 (82, 83) is: What is necessary is just to be larger than the average value (0.2 THz) of spectral full widths at half maximum ⁇ f81 to ⁇ f83 in the plurality of light emitting element groups 81 to 83 and smaller than 11.4 THz.
  • the center frequency differences ⁇ S12 and ⁇ S23 are preferably 11.0 THz or less.
  • FIG. 17 shows the range of the center frequency difference satisfying the speckle contrast reduction rate D3 of 50% improvement rate by the hatched area.
  • the center frequency differences ⁇ S12 and ⁇ S23 between the other adjacent light emitting element groups 81 and 82 (82 and 83) are 3.3 THz or more. And 10.4 THz or less.
  • the center frequency differences ⁇ S12 and ⁇ S23 are preferably set to 3.5 THz or more, and the center frequency differences ⁇ S12 and ⁇ S23 are preferably set to 10.0 THz or less.
  • the speckle contrast reduction rate can be increased to 50% or more by setting the maximum center frequency difference ⁇ W1 to 35 THz or more.
  • the maximum center frequency difference ⁇ W1 is preferably 35 THz or more.
  • the maximum center frequency difference ⁇ W1 is greater than 100 THz, the chromaticity of light emitted from the light emitting element group having the minimum center frequency and the light emitting element group having the maximum center frequency is different.
  • the light source device 2 includes the plurality of light emitting elements 61 to 69, and the plurality of light emitting elements 61 to 69 includes a plurality of light emitting element groups 81 for each central frequency of the light emitting elements 61 to 69.
  • the center frequency differences ⁇ S12 and ⁇ S23 between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83 are divided into the plurality of light emitting elements. It is larger than the average value of the full spectrum half widths ⁇ f81 to ⁇ f83 in the element groups 81 to 83 and smaller than 11.4 THz.
  • the center frequency difference ⁇ S12 between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83, ⁇ S23 is 3.3 THz or more and 10.4 THz or less.
  • the speckle contrast has a 50% improvement rate.
  • the image projection apparatus 1 includes the light source device 2 and uses light emitted from the light source device 2 as projection light.
  • the light source device and the image projection device are not limited to the configuration of the above-described embodiment, and are not limited to the above-described effects. It goes without saying that the light source device and the image projection device can be variously modified without departing from the gist of the present invention. For example, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.
  • the center frequency between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83 is configured to be 4.0 THz.
  • the light source device is not limited to such a configuration.
  • the center frequency differences ⁇ S12 and ⁇ S23 between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83 are a plurality of light emitting elements. Any configuration that is larger than the average value of the spectrum full widths at half maximum ⁇ f81 to ⁇ f83 in the element groups f81 to f83 and smaller than 11.4 THz may be used.
  • the light source device 2 (see FIG. 2) according to the above embodiment, nine light emitting elements 61 to 69 are provided, and three light emitting element groups 81 to 83 are provided.
  • the light source device is not limited to such a configuration.
  • the image projection device 1 (see FIG. 1) according to the above-described embodiment, there are three light source devices 2 provided.
  • the image projector is not limited to such a configuration.
  • the image projection apparatus may be configured such that one, two, or four or more light source devices 2 are provided.
  • SYMBOLS 1 ... Image projector, 2, 2R, 2G, 2B ... Light source device, 3 ... Light source part, 4 ... Optical system, 5 ... Main part, 5a ... Connection part, 6 ... Light emitting element, 7 ... Collimator lens, 8 ... Light emission Element group, 10 ... image projection unit, 11 ... image optical system, 11a ... polarization beam splitter, 11b ... spatial modulation element, 11c ... dichroic prism, 11d ... reflection mirror, 12 ... projection optical system, 13 ... image projection main body, 13a ... connecting portion, 20 ... light guide, 61-69 ... (first to ninth) light emitting elements, 81-83 ... (first to third) light emitting element groups, 100 ... screen

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  • General Physics & Mathematics (AREA)
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  • Condensed Matter Physics & Semiconductors (AREA)
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Abstract

An image projection device is provided with a light source device and uses light output from the light source device as projection light. The light source device is provided with a plurality of light-emitting elements. The plurality of light-emitting elements is divided into a plurality of light-emitting element groups according to the center frequency of each light-emitting element. The center frequency difference between the center frequency of a light-emitting element group and the center frequency of a neighboring light-emitting element group is larger than the average value of the full width at half maximum of spectrum in the plurality of light-emitting element groups, and is smaller than 11.4 THz.

Description

光源装置及び画像投影装置Light source device and image projection device
　本発明は、複数の発光素子を備える光源装置に関し、また、該光源装置を備える画像投影装置に関する。 The present invention relates to a light source device including a plurality of light emitting elements, and also relates to an image projection device including the light source device.
　従来、光源装置として、複数の発光素子を備える光源装置が、知られている（例えば、特許文献１）。そして、特許文献１には、一つの発光素子における複数のエミッタから出射されるレーザ光の中心波長差を、当該レーザ光のスペクトル半値全幅以下にすることで、スペックルノイズを低減することができる、と記載されている。しかしながら、斯かる構成では、スペックルノイズを充分に低減することができないことが分かった。 Conventionally, a light source device including a plurality of light emitting elements is known as a light source device (for example, Patent Document 1). And in patent document 1, speckle noise can be reduced by making the center wavelength difference of the laser beam radiate | emitted from the some emitter in one light emitting element below the full width at half maximum of the spectrum of the said laser beam. , And is described. However, it has been found that such a configuration cannot sufficiently reduce speckle noise.
日本国特表２００４－５０３９２３号公報Japanese National Table 2004-503923
　よって、本発明は、斯かる事情に鑑み、スペックスノイズを充分に低減することができる光源装置及び画像投影装置を提供することを課題とする。 Therefore, in view of such circumstances, an object of the present invention is to provide a light source device and an image projection device that can sufficiently reduce specs noise.
　本発明に係る光源装置は、複数の発光素子を備え、前記複数の発光素子は、各発光素子の中心周波数ごとに複数の発光素子群に区分けされ、前記発光素子群の中心周波数と隣接する他の発光素子群の中心周波数との中心周波数差は、前記複数の発光素子群におけるスペクトル半値全幅の平均値よりも大きく且つ１１．４ＴＨｚよりも小さい。 The light source device according to the present invention includes a plurality of light emitting elements, and the plurality of light emitting elements are divided into a plurality of light emitting element groups for each central frequency of each light emitting element, and are adjacent to the center frequency of the light emitting element group. The center frequency difference from the center frequency of the light emitting element group is larger than the average value of the full widths at half maximum of the plurality of light emitting element groups and smaller than 11.4 THz.
　また、光源装置においては、前記発光素子群の中心周波数と隣接する他の発光素子群の中心周波数との中心周波数差は、３．３ＴＨｚ以上であって且つ１０．４ＴＨｚ以下である、という構成でもよい。 In the light source device, the center frequency difference between the center frequency of the light emitting element group and the center frequency of another adjacent light emitting element group is 3.3 THz or more and 10.4 THz or less. Good.
　また、画像投影装置は、前記光源装置を備え、前記光源装置から出射される光を投射光として用いる。 Also, the image projection device includes the light source device, and uses light emitted from the light source device as projection light.
　以上の如く、本発明に係る光源装置及び画像投影装置は、スペックスノイズを充分に低減することができる、という優れた効果を奏する。 As described above, the light source device and the image projection device according to the present invention have an excellent effect that specks noise can be sufficiently reduced.
一実施形態に係る画像投影装置の全体概要図である。1 is an overall schematic diagram of an image projection apparatus according to an embodiment. 同実施形態に係る光源装置の要部概要図である。It is a principal part schematic diagram of the light source device which concerns on the embodiment. 同実施形態に係る光源装置の周波数と光強度との関係を示す図である。It is a figure which shows the relationship between the frequency and light intensity of the light source device which concern on the embodiment. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、周波数領域の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of a frequency domain. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、周波数領域の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of a frequency domain. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、周波数領域の関係、及び発光素子群のスペクトル半値全幅の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of a frequency domain, and the relationship of the spectrum half width of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群のスペクトル半値全幅の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the spectrum half value full width of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群のスペクトル半値全幅の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the spectrum half value full width of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群の最大中心周波数差の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the largest center frequency difference of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群の最大中心周波数差の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the largest center frequency difference of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群の最大中心周波数差の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the largest center frequency difference of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群の最大中心周波数差の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the largest center frequency difference of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群の最大中心周波数差の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the largest center frequency difference of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群の最大中心周波数差の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the largest center frequency difference of a light emitting element group. 中心周波数差とスペックルコントラスト減少率との関係を示す図であって、発光素子群の最大中心周波数差の関係を説明する図である。It is a figure which shows the relationship between a center frequency difference and a speckle contrast reduction | decrease rate, Comprising: It is a figure explaining the relationship of the largest center frequency difference of a light emitting element group. 最大中心周波数差に対して、特許文献１に係る発明のスペックルコントラスト減少率よりも大きいスペックルコントラスト減少率を有する中心周波数差の範囲を示す図である。It is a figure which shows the range of the center frequency difference which has a speckle contrast reduction rate larger than the speckle contrast reduction rate of the invention which concerns on patent document 1 with respect to the largest center frequency difference. 最大中心周波数差に対して、５０％向上率のスペックルコントラスト減少率以上のスペックルコントラスト減少率を有する中心周波数差の範囲を示す図である。It is a figure which shows the range of the center frequency difference which has the speckle contrast reduction rate more than the speckle contrast reduction rate of 50% improvement rate with respect to the maximum center frequency difference.
　以下、光源装置及び画像投影装置における一実施形態について、図１～図３を参酌して説明する。なお、各図において、図面の寸法比と実際の寸法比とは、必ずしも一致していない。 Hereinafter, an embodiment of the light source device and the image projection device will be described with reference to FIGS. In each figure, the dimensional ratio in the drawing does not necessarily match the actual dimensional ratio.
　図１に示すように、本実施形態に係る画像投影装置１は、それぞれ異なる色の光を出射する複数（本実施形態においては３つ）の光源装置２（２Ｒ，２Ｇ，２Ｂ）と、光源装置２からの光で光画像を生成し、スクリーン１００に投影する画像投影部１０とを備えている。また、画像投影装置１は、光源装置２から出射された光を伝搬して画像投影部１０に入射する導光体（例えば、光ファイバ）２０を備えている。 As shown in FIG. 1, an image projection apparatus 1 according to the present embodiment includes a plurality (three in the present embodiment) of light source devices 2 (2R, 2G, 2B) that emit light of different colors, and a light source. An image projection unit 10 that generates an optical image with the light from the apparatus 2 and projects the optical image onto the screen 100 is provided. The image projector 1 also includes a light guide (for example, an optical fiber) 20 that propagates the light emitted from the light source device 2 and enters the image projector 10.
　光源装置２は、第１の色（例えば、赤色）の光を出射する第１の光源装置２Ｒと、第２の色（例えば、緑色）の光を出射する第２の光源装置２Ｇと、第３の色（例えば、青色）の光を出射する第３の光源装置２Ｂとを備えている。本実施形態においては、複数の光源装置２は、第１～第３の色の光を分離した状態で画像投影部１０に向けて出射している。 The light source device 2 includes a first light source device 2R that emits light of a first color (for example, red), a second light source device 2G that emits light of a second color (for example, green), And a third light source device 2B that emits light of three colors (for example, blue). In the present embodiment, the plurality of light source devices 2 emit light of the first to third colors toward the image projection unit 10 in a separated state.
　画像投影部１０は、各光源装置２から出射された光が入射されて光画像を生成する画像光学系１１と、画像光学系１１から出射された光画像を入射してスクリーン１００に投影する投影光学系（例えば、投影レンズ）１２とを備えている。また、画像投影部１０は、各光学系１１，１２を収容する画像投影本体部１３を備えている。なお、画像投影本体部１３は、導光体２０の他端部と接続される接続部１３ａを備えている。 The image projection unit 10 receives the light emitted from each light source device 2 and generates an optical image, and the projection that projects the light image emitted from the image optical system 11 onto the screen 100. An optical system (for example, a projection lens) 12 is provided. Further, the image projection unit 10 includes an image projection main body unit 13 that accommodates the optical systems 11 and 12. The image projection main body 13 includes a connection portion 13 a that is connected to the other end of the light guide 20.
　画像光学系１１は、光源装置２から出射された光のうち所定の偏光成分のみを透過する偏光ビームスプリッタ１１ａと、偏光ビームスプリッタ１１ａから出射された光を変調することで光画像にする空間変調素子１１ｂとを備えている。また、画像光学系１１は、各空間変調素子１１ｂで透過された光を合成するダイクロイックプリズム１１ｃと、第１及び第３の光源装置２Ｒ，２Ｂから出射されたレーザ光を反射する反射ミラー１１ｄとを備えている。 The image optical system 11 includes a polarization beam splitter 11a that transmits only a predetermined polarization component of the light emitted from the light source device 2, and spatial modulation that converts the light emitted from the polarization beam splitter 11a into an optical image. And an element 11b. In addition, the image optical system 11 includes a dichroic prism 11c that synthesizes the light transmitted through each spatial modulation element 11b, and a reflection mirror 11d that reflects the laser light emitted from the first and third light source devices 2R and 2B. It has.
　本実施形態においては、各空間変調素子１１ｂは、透過型液晶素子としている。なお、画像光学系１１は、反射型液晶素子又はデジタルマイクロミラーデバイスである空間変調素子１１ｂを備える、という構成でもよい。 In this embodiment, each spatial modulation element 11b is a transmissive liquid crystal element. Note that the image optical system 11 may include a spatial modulation element 11b that is a reflective liquid crystal element or a digital micromirror device.
　光源装置２は、光を出射する複数の光源部３と、複数の光源部３から出射された光が入射される光学系４と、複数の光源部３及び光学系４を収容する本体部５とを備えている。なお、本体部５は、導光体２０の一端部と接続される接続部５ａを備えている。 The light source device 2 includes a plurality of light source units 3 that emit light, an optical system 4 that receives light emitted from the plurality of light source units 3, and a main body unit 5 that houses the plurality of light source units 3 and the optical system 4. And. The main body 5 includes a connecting portion 5 a that is connected to one end of the light guide 20.
　図２に示すように、光源部３は、光を発する発光素子６と、発光素子６から出射される光を略平行光にするコリメータレンズ７とを備えている。本実施形態においては、各光源装置２において、発光素子６は、９つ備えられており、それぞれ第１～第９の発光素子６１～６９という。また、本実施形態においては、発光素子６は、レーザ光を出射する半導体レーザとしており、該半導体レーザは、１つのエミッタを有するＣＡＮタイプでもよく、複数のエミッタを有するアレイタイプでもよい。 As shown in FIG. 2, the light source unit 3 includes a light emitting element 6 that emits light and a collimator lens 7 that converts light emitted from the light emitting element 6 into substantially parallel light. In the present embodiment, each light source device 2 includes nine light emitting elements 6, which are referred to as first to ninth light emitting elements 61 to 69, respectively. In the present embodiment, the light emitting element 6 is a semiconductor laser that emits laser light. The semiconductor laser may be a CAN type having one emitter or an array type having a plurality of emitters.
　複数の発光素子６１～６９は、各発光素子６１～６９の中心周波数ｆ６１～ｆ６９ごとに複数の発光素子群８に区分けされている。本実施形態においては、発光素子群８は、３つ備えられており、それぞれ第１～第３の発光素子群８１～８３という。なお、第１の発光素子群８１は、第１～第３の発光素子６１～６３を備えており、第２の発光素子群８２は、第４～第６の発光素子６４～６６を備えており、第３の発光素子群８３は、第７～第９の発光素子６７～６９を備えている。 The plurality of light emitting elements 61 to 69 are divided into a plurality of light emitting element groups 8 for each of the center frequencies f61 to f69 of the light emitting elements 61 to 69. In the present embodiment, three light emitting element groups 8 are provided, which are referred to as first to third light emitting element groups 81 to 83, respectively. Note that the first light emitting element group 81 includes first to third light emitting elements 61 to 63, and the second light emitting element group 82 includes fourth to sixth light emitting elements 64 to 66. The third light emitting element group 83 includes seventh to ninth light emitting elements 67 to 69.
　まず、本実施形態に係る各発光素子群８１～８３の区分けについて、説明する。 First, the division of the light emitting element groups 81 to 83 according to the present embodiment will be described.
　図３は、周波数に対する光強度のスペクトル分布を示している。破線Ｓ６１～Ｓ６９は、各発光素子６１～６９のスペクトル分布を示しており、実線Ｓ８１～８３は、各発光素子群８１～８３のスペクトル分布を示している。本実施形態においては、各発光素子６１～６９は、スペクトル分布が略同じとなるように、構成されている。 FIG. 3 shows the spectral distribution of light intensity with respect to frequency. Dashed lines S61 to S69 indicate the spectral distribution of the light emitting elements 61 to 69, and solid lines S81 to 83 indicate the spectral distribution of the light emitting element groups 81 to 83. In the present embodiment, the light emitting elements 61 to 69 are configured so that the spectral distributions are substantially the same.
　各発光素子群８１～８３は、所定の１ＴＨｚの範囲に中心周波数を有する少なくとも１つの発光素子６１～６９から構成されている。また、各発光素子群８１～８３は、スペクトル分布において、スペクトル半値全幅（相対光強度がピーク値の５０％になる周波数幅）の周波数範囲が離間するように（即ち、重ならないように）、それぞれ区分けされている。 Each light emitting element group 81 to 83 is composed of at least one light emitting element 61 to 69 having a center frequency in a predetermined 1 THz range. In addition, each light emitting element group 81 to 83 has a spectral distribution in which the frequency range of the full width at half maximum of the spectrum (frequency width at which the relative light intensity is 50% of the peak value) is separated (ie, does not overlap). Each is divided.
　第１の発光素子群８１は、５５９．５ＴＨｚ～５６０．５ＴＨｚの１ＴＨｚの範囲に中心周波数を有する第１～第３の発光素子６１～６３で構成されている。具体的には、第１の発光素子６１の中心周波数は、５６０ＴＨｚであり、第２の発光素子６２の中心周波数は、５５９．５ＴＨｚであり、第３の発光素子６３の中心周波数は、５６０．５ＴＨｚである。 The first light-emitting element group 81 is composed of first to third light-emitting elements 61 to 63 having a center frequency in the range of 19.5 Hz from 559.5 THz to 560.5 THz. Specifically, the center frequency of the first light emitting element 61 is 560 THz, the center frequency of the second light emitting element 62 is 559.5 THz, and the center frequency of the third light emitting element 63 is 560.Hz. 5 THz.
　第２の発光素子群８２は、５６３．５ＴＨｚ～５６４．５ＴＨｚの１ＴＨｚの範囲に中心周波数を有する第４～第６の発光素子６４～６６で構成されている。具体的には、第４の発光素子６４の中心周波数は、５６４ＴＨｚであり、第５の発光素子６５の中心周波数は、５６３．５ＴＨｚであり、第６の発光素子６６の中心周波数は、５６４．５ＴＨｚである。 The second light emitting element group 82 is composed of fourth to sixth light emitting elements 64 to 66 having a center frequency in the range of 1 THz from 563.5 THz to 564.5 THz. Specifically, the center frequency of the fourth light emitting element 64 is 564 THz, the center frequency of the fifth light emitting element 65 is 563.5 THz, and the center frequency of the sixth light emitting element 66 is 564. 5 THz.
　第３の発光素子群８３は、５６７．５ＴＨｚ～５６８．５ＴＨｚの１ＴＨｚの範囲に中心周波数を有する第７～第９の発光素子６７～６９で構成されている。具体的には、第７の発光素子６７の中心周波数は、５６８ＴＨｚであり、第８の発光素子６８の中心周波数は、５６７．５ＴＨｚであり、第９の発光素子６９の中心周波数は、５６８．５ＴＨｚである。 The third light emitting element group 83 is composed of seventh to ninth light emitting elements 67 to 69 having a center frequency in the range of 1 THz from 567.5 THz to 568.5 THz. Specifically, the center frequency of the seventh light emitting element 67 is 568 THz, the center frequency of the eighth light emitting element 68 is 567.5 THz, and the center frequency of the ninth light emitting element 69 is 568. 5 THz.
　本実施形態においては、各発光素子６１～６９の中心周波数は、スペクトル分布において、スペクトル半値全幅（相対光強度がピーク値の５０％になる周波数幅）の中心となる周波数としている。なお、各発光素子６１～６９の中心周波数は、スペクトル分布において、ピーク周波数（相対光強度がピーク値となる周波数）としてもよい。 In the present embodiment, the center frequency of each of the light emitting elements 61 to 69 is a frequency that is the center of the full width at half maximum of the spectrum (frequency width at which the relative light intensity is 50% of the peak value) in the spectrum distribution. The center frequency of each of the light emitting elements 61 to 69 may be a peak frequency (frequency at which the relative light intensity becomes a peak value) in the spectrum distribution.
　次に、本実施形態に係る各発光素子群８１～８３のスペクトル分布について、説明する。 Next, the spectral distribution of each of the light emitting element groups 81 to 83 according to this embodiment will be described.
　第１の発光素子群８１のスペクトル半値全幅Δｆ８１（＝ｆ８１ｂ－ｆ８１ａ）は、１．５ＴＨｚであって、第１の発光素子群８１の中心周波数ｆ８１ｃは、５６０ＴＨｚである。なお、各発光素子群８１～８３の中心周波数ｆ８１ｃ～ｆ８３ｃは、スペクトル分布において、スペクトル半値全幅の中心となる周波数（例えば、第１の発光素子群８１の中心周波数ｆ８１ｃにおいては、ｆ８１ｃ＝ｆ８１ａ＋（ｆ８１ｂ－ｆ８１ａ）／２）としている。 The full width at half maximum Δf81 (= f81b−f81a) of the first light emitting element group 81 is 1.5 THz, and the center frequency f81c of the first light emitting element group 81 is 560 THz. The center frequencies f81c to f83c of the light emitting element groups 81 to 83 are frequencies that are the center of the spectrum full width at half maximum in the spectrum distribution (for example, f81c = f81a + (in the center frequency f81c of the first light emitting element group 81). f81b-f81a) / 2).
　第２の発光素子群８２のスペクトル半値全幅Δｆ８２（＝ｆ８２ｂ－ｆ８２ａ）は、１．５ＴＨｚであって、第２の発光素子群８２の中心周波数ｆ８２ｃは、５６４ＴＨｚである。また、第３の発光素子群８３のスペクトル半値全幅Δｆ８３（＝ｆ８３ｂ－ｆ８３ａ）は、１．５ＴＨｚであって、第３の発光素子群８３の中心周波数ｆ８３ｃは、５６８ＴＨｚである。 The full width at half maximum Δf82 (= f82b−f82a) of the second light emitting element group 82 is 1.5 THz, and the center frequency f82c of the second light emitting element group 82 is 564 THz. The full width at half maximum Δf83 (= f83b−f83a) of the third light emitting element group 83 is 1.5 THz, and the center frequency f83c of the third light emitting element group 83 is 568 THz.
　このように、各発光素子群８１～８３の中心周波数ｆ８１ｃ～ｆ８３ｃと、隣接する他の発光素子群８１～８３の中心周波数ｆ８１ｃ～ｆ８３ｃとの中心周波数差ΔＳ１２（＝ｆ８２ｃ－ｆ８１ｃ），ΔＳ２３（＝ｆ８３ｃ－ｆ８２ｃ）は、それぞれ４ＴＨｚである。そして、複数の発光素子群８１～８３におけるスペクトル半値全幅Δｆ８１～Δｆ８３の平均値は、１．５ＴＨｚである。 Thus, the center frequency differences ΔS12 (= f82c−f81c), ΔS23 (the center frequencies f81c to f83c of the respective light emitting element groups 81 to 83 and the center frequencies f81c to f83c of the other adjacent light emitting element groups 81 to 83) = F83c−f82c) is 4 THz respectively. The average value of the spectrum half widths Δf81 to Δf83 in the plurality of light emitting element groups 81 to 83 is 1.5 THz.
　また、最大中心周波数差ΔＷ１（＝ｆ８３ｃ－ｆ８１ｃ）は、８ＴＨｚである。なお、最大中心周波数差ΔＷ１は、複数の発光素子群８１～８３の中心周波数ｆ８１～ｆ８３のうち、最大の中心周波数ｆ８３と最小の中心周波数ｆ８１との周波数差をいう。 Also, the maximum center frequency difference ΔW1 (= f83c−f81c) is 8 THz. The maximum center frequency difference ΔW1 is a frequency difference between the maximum center frequency f83 and the minimum center frequency f81 among the center frequencies f81 to f83 of the plurality of light emitting element groups 81 to 83.
　本実施形態に係る画像投影装置１及び光源装置２の構成については以上の通りであり、次に、本実施形態に係る画像投影装置１及び光源装置２の作用について、図４～図１７を参酌して説明する。 The configurations of the image projection device 1 and the light source device 2 according to the present embodiment are as described above. Next, with reference to FIGS. 4 to 17, regarding the operation of the image projection device 1 and the light source device 2 according to the present embodiment. To explain.
　図４～図１５において、スペックルコントラスト減少率は、スペクトル半値全幅が０．２ＴＨｚである１つの発光素子群のスペックルコントラストに対する、スペックルコントラストの減少率である。なお、スペックルコントラストは、ゲイン２．４のスクリーンに照射した場合のシミュレーション値を用いており、下記の数式に基づいて算出している。
Figure JPOXMLDOC01-appb-I000001
　ただし、Ｋｇはスペクトルの自己相関関数を表し、μは２つの異なる波長でのスペックルの相関関数を表し、Δνは周波数差を表す。 4 to 15, the speckle contrast reduction rate is the speckle contrast reduction rate with respect to the speckle contrast of one light emitting element group having a full spectrum half width of 0.2 THz. The speckle contrast is calculated based on the following formula using a simulation value when the screen is irradiated with a gain of 2.4.
Figure JPOXMLDOC01-appb-I000001
Where Kg represents the autocorrelation function of the spectrum, μ represents the correlation function of speckle at two different wavelengths, and Δν represents the frequency difference.
　まず、周波数の領域がスペックルコントラスト減少率に与える影響を、図４～図６を参酌して説明する。 First, the influence of the frequency region on the speckle contrast reduction rate will be described with reference to FIGS.
　図４～図６において、各発光素子群のスペクトル半値全幅は、０．２ＴＨｚと同じであり、また、最大中心周波数差も、３０ＴＨｚと同じである。斯かる条件において、中心周波数差を変化させて、スペックルコントラスト減少率を算出した。例えば、中心周波数差が１５ＴＨｚである場合は、発光素子群は３つとなり、中心周波数差が１０ＴＨｚである場合は、発光素子群は４つとなり、中心周波数差が５ＴＨｚである場合は、発光素子群は、７つとなる。 4 to 6, the full width at half maximum of each light emitting element group is the same as 0.2 THz, and the maximum center frequency difference is also the same as 30 THz. Under such conditions, the speckle contrast reduction rate was calculated by changing the center frequency difference. For example, when the center frequency difference is 15 THz, there are three light emitting element groups. When the center frequency difference is 10 THz, there are four light emitting element groups. When the center frequency difference is 5 THz, the light emitting element groups There will be seven groups.
　そして、図４は、青色の光の周波数領域である６３７ＴＨｚ（４７１ｎｍ）～６６７ＴＨｚ（４４９ｎｍ）の場合を示し、図５は、赤色の光の周波数領域である４５４ＴＨｚ（６６０ｎｍ）～４８４ＴＨｚ（６１９ｎｍ）の場合を示し、図６は、緑色の光の周波数領域である５４１ＴＨｚ（５５４ｎｍ）～５７１ＴＨｚ（５２５ｎｍ）の場合を示している。図４～図６に示すように、周波数の領域がスペックルコントラスト減少率に与える影響は、殆どない。 4 shows a case of 637 THz (471 nm) to 667 THz (449 nm) which is a frequency region of blue light, and FIG. 5 shows a case of 454 THz (660 nm) to 484 THz (619 nm) of a frequency region of red light. FIG. 6 shows a case of 541 THz (554 nm) to 571 THz (525 nm), which is a frequency region of green light. As shown in FIGS. 4 to 6, the frequency region has little influence on the speckle contrast reduction rate.
　次に、各発光素子群のスペクトル半値全幅がスペックルコントラスト減少率に与える影響を、図６～図８を参酌して説明する。 Next, the effect of the full width at half maximum of each light emitting element group on the speckle contrast reduction rate will be described with reference to FIGS.
　図６～図８において、最大中心周波数差は、３０ＴＨｚと同じであり、また、周波数領域も、５４１ＴＨｚ～５７１ＴＨｚと同じである。斯かる条件において、中心周波数差を変化させて、スペックルコントラスト減少率を算出した。 6 to 8, the maximum center frequency difference is the same as 30 THz, and the frequency region is also the same as 541 THz to 571 THz. Under such conditions, the speckle contrast reduction rate was calculated by changing the center frequency difference.
　そして、図６は、各発光素子群のスペクトル半値全幅が０．２ＴＨｚである場合を示し、図７は、各発光素子群のスペクトル半値全幅が０．１ＴＨｚである場合を示し、図８は、各発光素子群のスペクトル半値全幅が１．０ＴＨｚである場合を示している。図６～図８に示すように、各発光素子群のスペクトル半値全幅がスペックルコントラスト減少率に与える影響は、殆どない。 6 shows a case where the full width at half maximum of each light emitting element group is 0.2 THz, FIG. 7 shows a case where the full width at half maximum of each light emitting element group is 0.1 THz, and FIG. The case where the full width at half maximum of each light emitting element group is 1.0 THz is shown. As shown in FIGS. 6 to 8, there is almost no influence of the full width at half maximum of each light emitting element group on the speckle contrast reduction rate.
　そこで、最大中心周波数差がスペックルコントラスト減少率に与える影響を、図９～図１７を参酌して説明する。 Therefore, the influence of the maximum center frequency difference on the speckle contrast reduction rate will be described with reference to FIGS.
　図９～図１５において、各発光素子群のスペクトル半値全幅は、０．２ＴＨｚと同じである。斯かる条件で、さまざまな最大中心周波数差において、中心周波数差を変化させて、スペックルコントラスト減少率を算出した。 9 to 15, the full width at half maximum of each light emitting element group is the same as 0.2 THz. Under such conditions, the speckle contrast reduction rate was calculated by changing the center frequency difference at various maximum center frequency differences.
　図９は、最大中心周波数差が２０ＴＨｚ（５４６ＴＨｚ～５６６ＴＨｚ）である場合を示している。斯かる場合、図９に示すように、特許文献１に係る発明（最大中心周波数差が発光素子のスペクトル半値全幅以下である発明）のスペックルコントラスト減少率Ｄ１に対して当該減少率を向上させるには、中心周波数差が０．２ＴＨｚ（各発光素子群８１～８３のスペクトル半値全幅Δｆ８１～Δｆ８３の平均値）よりも大きく且つ１７．３ＴＨｚよりも小さい必要がある。 FIG. 9 shows a case where the maximum center frequency difference is 20 THz (546 THz to 566 THz). In such a case, as shown in FIG. 9, the reduction rate is improved with respect to the speckle contrast reduction rate D1 of the invention according to Patent Document 1 (the invention in which the maximum center frequency difference is equal to or less than the full width at half maximum of the light emitting element). Therefore, the center frequency difference needs to be larger than 0.2 THz (average value of spectral full widths at half maximum Δf81 to Δf83 of the light emitting element groups 81 to 83) and smaller than 17.3 THz.
　また、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して、最大のスペックルコントラスト減少率Ｄ２が１００％向上率とした際に、５０％向上率のスペックルコントラスト減少率Ｄ３（＝Ｄ１＋（Ｄ１＋Ｄ２）／２）以上を満たすには、中心周波数差が３．３ＴＨｚ以上であり且つ１３．８ＴＨｚ以下であればよい。 Further, when the maximum speckle contrast reduction rate D2 of the invention according to Patent Document 1 is set to 100% improvement rate, the speckle contrast reduction rate D3 (= 3% = 50% improvement rate). In order to satisfy D1 + (D1 + D2) / 2) or more, the center frequency difference should be 3.3 THz or more and 13.8 THz or less.
　図１０は、最大中心周波数差が３０ＴＨｚ（５４１ＴＨｚ～５７１ＴＨｚ）である場合を示している。斯かる場合、図１０に示すように、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して該減少率を向上させるには、中心周波数差が０．２ＴＨｚ（各発光素子群８１～８３のスペクトル半値全幅Δｆ８１～Δｆ８３の平均値）よりも大きく且つ１４．７ＴＨｚよりも小さい必要がある。また、５０％向上率のスペックルコントラスト減少率Ｄ３以上を満たすには、中心周波数差が３．２ＴＨｚ以上であり且つ１２．３ＴＨｚ以下であればよい。 FIG. 10 shows a case where the maximum center frequency difference is 30 THz (541 THz to 571 THz). In such a case, as shown in FIG. 10, in order to improve the reduction rate relative to the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum Δf81 to Δf83 of 83 is required to be smaller than 14.7 THz. Further, in order to satisfy the speckle contrast reduction rate D3 or more of 50% improvement rate, the center frequency difference should be 3.2 THz or more and 12.3 THz or less.
　図１１は、最大中心周波数差が３５ＴＨｚ（５４２ＴＨｚ～５７７ＴＨｚ）である場合を示している。斯かる場合、図１１に示すように、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して該減少率を向上させるには、中心周波数差が０．２ＴＨｚ（各発光素子群８１～８３のスペクトル半値全幅Δｆ８１～Δｆ８３の平均値）よりも大きく且つ１４．０ＴＨｚよりも小さい必要がある。また、５０％向上率のスペックルコントラスト減少率Ｄ３以上を満たすには、中心周波数差が３．３ＴＨｚ以上であり且つ１２．２ＴＨｚ以下であればよい。 FIG. 11 shows a case where the maximum center frequency difference is 35 THz (542 THz to 577 THz). In such a case, as shown in FIG. 11, in order to improve the reduction rate relative to the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum Δf81 to Δf83 of 83 is required to be larger than 14.0 THz. Further, in order to satisfy the speckle contrast reduction rate D3 or more of 50% improvement rate, the center frequency difference should be 3.3 THz or more and 12.2 THz or less.
　図１２は、最大中心周波数差が５０ＴＨｚ（５３３ＴＨｚ～５８３ＴＨｚ）である場合を示している。斯かる場合、図１２に示すように、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して該減少率を向上させるには、中心周波数差が０．２ＴＨｚ（各発光素子群８１～８３のスペクトル半値全幅Δｆ８１～Δｆ８３の平均値）よりも大きく且つ１３．０ＴＨｚよりも小さい必要がある。また、５０％向上率のスペックルコントラスト減少率Ｄ３以上を満たすには、中心周波数差が３．３ＴＨｚ以上であり且つ１１．４ＴＨｚ以下であればよい。 FIG. 12 shows a case where the maximum center frequency difference is 50 THz (533 THz to 583 THz). In such a case, as shown in FIG. 12, in order to improve the reduction rate relative to the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the center frequency difference is 0.2 THz (each of the light emitting element groups 81 to The spectral full width at half maximum Δf81 to Δf83 of 83 is required to be larger than 13.0 THz. Further, in order to satisfy the speckle contrast reduction rate D3 or more of 50% improvement rate, the center frequency difference should be 3.3 THz or more and 11.4 THz or less.
　図１３は、最大中心周波数差が７０ＴＨｚ（５１８ＴＨｚ～５８８ＴＨｚ）である場合を示している。斯かる場合、図１３に示すように、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して該減少率を向上させるには、中心周波数差が０．２ＴＨｚ（各発光素子群８１～８３のスペクトル半値全幅Δｆ８１～Δｆ８３の平均値）よりも大きく且つ１２．１ＴＨｚよりも小さい必要がある。また、５０％向上率のスペックルコントラスト減少率Ｄ３以上を満たすには、中心周波数差が３．２ＴＨｚ以上であり且つ１０．９ＴＨｚ以下であればよい。 FIG. 13 shows a case where the maximum center frequency difference is 70 THz (518 THz to 588 THz). In such a case, as shown in FIG. 13, in order to improve the reduction rate relative to the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum Δf81 to Δf83 of 83 is required to be smaller than 12.1 THz. Further, in order to satisfy the speckle contrast reduction rate D3 or more of 50% improvement rate, the center frequency difference should be 3.2 THz or more and 10.9 THz or less.
　図１４は、最大中心周波数差が９０ＴＨｚ（５１０ＴＨｚ～６００ＴＨｚ）である場合を示している。斯かる場合、図１４に示すように、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して該減少率を向上させるには、中心周波数差が０．２ＴＨｚ（各発光素子群８１～８３のスペクトル半値全幅Δｆ８１～Δｆ８３の平均値）よりも大きく且つ１１．５ＴＨｚよりも小さい必要がある。また、５０％向上率のスペックルコントラスト減少率Ｄ３以上を満たすには、中心周波数差が３．０ＴＨｚ以上であり且つ１０．５ＴＨｚ以下であればよい。 FIG. 14 shows a case where the maximum center frequency difference is 90 THz (510 THz to 600 THz). In such a case, as shown in FIG. 14, in order to improve the reduction rate relative to the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the center frequency difference is 0.2 THz (each of the light emitting element groups 81 to The spectral full width at half maximum Δf81 to Δf83 of 83 is required to be larger than 11.5 THz. Further, in order to satisfy the speckle contrast reduction rate D3 of 50% improvement rate, the center frequency difference should be 3.0 THz or more and 10.5 THz or less.
　図１５は、最大中心周波数差が１００ＴＨｚ（５００ＴＨｚ～６００ＴＨｚ）である場合を示している。斯かる場合、図１５に示すように、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して該減少率を向上させるには、中心周波数差が０．２ＴＨｚ（各発光素子群８１～８３のスペクトル半値全幅Δｆ８１～Δｆ８３の平均値）よりも大きく且つ１１．４ＴＨｚよりも小さい必要がある。また、５０％向上率のスペックルコントラスト減少率Ｄ３以上を満たすには、中心周波数差が２．７ＴＨｚ以上であり且つ１０．４ＴＨｚ以下であればよい。 FIG. 15 shows a case where the maximum center frequency difference is 100 THz (500 THz to 600 THz). In such a case, as shown in FIG. 15, in order to improve the reduction rate relative to the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the center frequency difference is 0.2 THz (each light emitting element group 81 to The spectral full width at half maximum Δf81 to Δf83 of 83 is required to be larger than 11.4 THz. Further, in order to satisfy the speckle contrast reduction rate D3 or more of 50% improvement rate, the center frequency difference should be 2.7 THz or more and 10.4 THz or less.
　そして、図１６は、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１よりも大きい減少率を有する中心周波数差の範囲を斜線領域で示している。これにより、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１よりも大きい減少率とするためには、隣接する発光素子群同士８１，８２（８２，８３）の中心周波数差ΔＳ１２，ΔＳ２３は、複数の発光素子群８１～８３におけるスペクトル半値全幅Δｆ８１～Δｆ８３の平均値（０．２ＴＨｚ）よりも大きく、１１．４ＴＨｚよりも小さくすればよい。なお、該中心周波数差ΔＳ１２，ΔＳ２３は、１１．０ＴＨｚ以下とすることが、好ましい。 FIG. 16 shows the range of the center frequency difference having a reduction rate larger than the speckle contrast reduction rate D1 of the invention according to Patent Document 1 in a hatched area. Thus, in order to obtain a reduction rate larger than the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the center frequency difference ΔS12, ΔS23 between the adjacent light emitting element groups 81, 82 (82, 83) is: What is necessary is just to be larger than the average value (0.2 THz) of spectral full widths at half maximum Δf81 to Δf83 in the plurality of light emitting element groups 81 to 83 and smaller than 11.4 THz. The center frequency differences ΔS12 and ΔS23 are preferably 11.0 THz or less.
　また、図１７は、５０％向上率のスペックルコントラスト減少率Ｄ３以上を満たす中心周波数差の範囲を斜線領域で示している。これにより、５０％向上率のスペックルコントラスト減少率Ｄ３以上とするためには、隣接する他の発光素子群同士８１，８２（８２，８３）の中心周波数差ΔＳ１２，ΔＳ２３は、３．３ＴＨｚ以上であって且つ１０．４ＴＨｚ以下とすればよい。なお、該中心周波数差ΔＳ１２，ΔＳ２３は、３．５ＴＨｚ以上とすることが、好ましく、また、該中心周波数差ΔＳ１２，ΔＳ２３は、１０．０ＴＨｚ以下とすることが好ましい。 Further, FIG. 17 shows the range of the center frequency difference satisfying the speckle contrast reduction rate D3 of 50% improvement rate by the hatched area. Thereby, in order to make the speckle contrast reduction rate D3 or more of 50% improvement rate, the center frequency differences ΔS12 and ΔS23 between the other adjacent light emitting element groups 81 and 82 (82 and 83) are 3.3 THz or more. And 10.4 THz or less. The center frequency differences ΔS12 and ΔS23 are preferably set to 3.5 THz or more, and the center frequency differences ΔS12 and ΔS23 are preferably set to 10.0 THz or less.
　また、図１１～図１５に示すように、最大中心周波数差ΔＷ１を３５ＴＨｚ以上にすることで、スペックルコントラスト減少率を５０％以上にすることができる。これにより、最大中心周波数差ΔＷ１は、３５ＴＨｚ以上であることが好ましい。なお、最大中心周波数差ΔＷ１が１００ＴＨｚよりも大きくなると、最小の中心周波数の発光素子群と最大の中心周波数の発光素子群とが発する光の色度は、異なってしまう。 As shown in FIGS. 11 to 15, the speckle contrast reduction rate can be increased to 50% or more by setting the maximum center frequency difference ΔW1 to 35 THz or more. Thus, the maximum center frequency difference ΔW1 is preferably 35 THz or more. When the maximum center frequency difference ΔW1 is greater than 100 THz, the chromaticity of light emitted from the light emitting element group having the minimum center frequency and the light emitting element group having the maximum center frequency is different.
　以上より、本実施形態に係る光源装置２は、複数の発光素子６１～６９を備え、前記複数の発光素子６１～６９は、各発光素子６１～６９の中心周波数ごとに複数の発光素子群８１～８３に区分けされ、前記発光素子群８１～８３の中心周波数ｆ８１～ｆ８３と隣接する他の発光素子群８１～８３の中心周波数ｆ８１～ｆ８３との中心周波数差ΔＳ１２，ΔＳ２３は、前記複数の発光素子群８１～８３におけるスペクトル半値全幅Δｆ８１～Δｆ８３の平均値よりも大きく且つ１１．４ＴＨｚよりも小さい。 As described above, the light source device 2 according to the present embodiment includes the plurality of light emitting elements 61 to 69, and the plurality of light emitting elements 61 to 69 includes a plurality of light emitting element groups 81 for each central frequency of the light emitting elements 61 to 69. The center frequency differences ΔS12 and ΔS23 between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83 are divided into the plurality of light emitting elements. It is larger than the average value of the full spectrum half widths Δf81 to Δf83 in the element groups 81 to 83 and smaller than 11.4 THz.
　斯かる構成によれば、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１よりも、大きいスペックルコントラスト減少率を有することができる。これにより、スペックスノイズを充分に低減することができる、 According to such a configuration, it is possible to have a speckle contrast reduction rate larger than the speckle contrast reduction rate D1 of the invention according to Patent Document 1. As a result, specs noise can be sufficiently reduced.
　また、本実施形態に係る光源装置２においては、前記発光素子群８１～８３の中心周波数ｆ８１～ｆ８３と隣接する他の発光素子群８１～８３の中心周波数ｆ８１～ｆ８３との中心周波数差ΔＳ１２，ΔＳ２３は、３．３ＴＨｚ以上であって且つ１０．４ＴＨｚ以下である。 In the light source device 2 according to the present embodiment, the center frequency difference ΔS12 between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83, ΔS23 is 3.3 THz or more and 10.4 THz or less.
　斯かる構成によれば、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１に対して、最大のスペックルコントラスト減少率Ｄ２が１００％向上率とした際に、５０％向上率のスペックルコントラスト減少率Ｄ３（＝Ｄ１＋（Ｄ１＋Ｄ２）／２）以上を満たすことができる。これにより、スペックスノイズをさらに充分に低減することができる。 According to such a configuration, when the maximum speckle contrast reduction rate D2 is 100% improvement rate with respect to the speckle contrast reduction rate D1 of the invention according to Patent Document 1, the speckle contrast has a 50% improvement rate. The reduction rate D3 (= D1 + (D1 + D2) / 2) or more can be satisfied. Thereby, specs noise can be further sufficiently reduced.
　また、本実施形態に係る画像投影装置１は、前記光源装置２を備え、前記光源装置２から出射される光を投射光として用いる。 Further, the image projection apparatus 1 according to the present embodiment includes the light source device 2 and uses light emitted from the light source device 2 as projection light.
　斯かる構成によれば、特許文献１に係る発明のスペックルコントラスト減少率Ｄ１よりも、大きいスペックルコントラスト減少率を有することができる。これにより、スペックスノイズを充分に低減することができる、 According to such a configuration, it is possible to have a speckle contrast reduction rate larger than the speckle contrast reduction rate D1 of the invention according to Patent Document 1. As a result, specs noise can be sufficiently reduced.
　なお、光源装置及び画像投影装置は、上記した実施形態の構成に限定されるものではなく、また、上記した作用効果に限定されるものではない。また、光源装置及び画像投影装置は、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。例えば、下記する各種の変更例に係る構成や方法等を任意に選択して、上記した実施形態に係る構成や方法等に採用してもよいことは勿論である。 Note that the light source device and the image projection device are not limited to the configuration of the above-described embodiment, and are not limited to the above-described effects. It goes without saying that the light source device and the image projection device can be variously modified without departing from the gist of the present invention. For example, it is needless to say that configurations, methods, and the like according to various modifications described below may be arbitrarily selected and employed in the configurations, methods, and the like according to the above-described embodiments.
　上記実施形態に係る光源装置２（図３参照）においては、発光素子群８１～８３の中心周波数ｆ８１～ｆ８３と、隣接する他の発光素子群８１～８３の中心周波数ｆ８１～ｆ８３との中心周波数差ΔＳ１２，ΔＳ２３は、４．０ＴＨｚである、という構成である。しかしながら、光源装置は、斯かる構成に限られない。例えば、光源装置においては、発光素子群８１～８３の中心周波数ｆ８１～ｆ８３と、隣接する他の発光素子群８１～８３の中心周波数ｆ８１～ｆ８３との中心周波数差ΔＳ１２，ΔＳ２３は、複数の発光素子群ｆ８１～ｆ８３におけるスペクトル半値全幅Δｆ８１～Δｆ８３の平均値よりも大きく且つ１１．４ＴＨｚよりも小さい、という構成であればよい。 In the light source device 2 (see FIG. 3) according to the above embodiment, the center frequency between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83. The difference ΔS12, ΔS23 is configured to be 4.0 THz. However, the light source device is not limited to such a configuration. For example, in the light source device, the center frequency differences ΔS12 and ΔS23 between the center frequencies f81 to f83 of the light emitting element groups 81 to 83 and the center frequencies f81 to f83 of other adjacent light emitting element groups 81 to 83 are a plurality of light emitting elements. Any configuration that is larger than the average value of the spectrum full widths at half maximum Δf81 to Δf83 in the element groups f81 to f83 and smaller than 11.4 THz may be used.
　また、上記実施形態に係る光源装置２（図２参照）においては、発光素子６１～６９は、９つ備えられ、発光素子群８１～８３は、３つ備えられている、という構成である。しかしながら、光源装置は、斯かる構成に限られない。例えば、光源装置においては、発光素子６は、複数備えられていればよく、特に数量を限定されず、また、発光素子群８も、複数備えられていればよく、特に数量を限定されない。 In the light source device 2 (see FIG. 2) according to the above embodiment, nine light emitting elements 61 to 69 are provided, and three light emitting element groups 81 to 83 are provided. However, the light source device is not limited to such a configuration. For example, in the light source device, it is only necessary that a plurality of light emitting elements 6 are provided, and the number is not particularly limited, and it is only necessary that a plurality of light emitting element groups 8 are provided, and the number is not particularly limited.
　また、上記実施形態に係る画像投影装置１（図１参照）においては、光源装置２は、３つ備えられている、という構成である。しかしながら、画像投影装置は、斯かる構成に限られない。例えば、画像投影装置においては、光源装置２は、１つ、２つ、又は４つ以上備えられている、という構成でもよい。 Further, in the image projection device 1 (see FIG. 1) according to the above-described embodiment, there are three light source devices 2 provided. However, the image projector is not limited to such a configuration. For example, the image projection apparatus may be configured such that one, two, or four or more light source devices 2 are provided.
　１…画像投影装置、２，２Ｒ，２Ｇ，２Ｂ…光源装置、３…光源部、４…光学系、５…本体部、５ａ…接続部、６…発光素子、７…コリメータレンズ、８…発光素子群、１０…画像投影部、１１…画像光学系、１１ａ…偏光ビームスプリッタ、１１ｂ…空間変調素子、１１ｃ…ダイクロイックプリズム、１１ｄ…反射ミラー、１２…投影光学系、１３…画像投影本体部、１３ａ…接続部、２０…導光体、６１～６９…（第１～第９の）発光素子、８１～８３…（第１～第３の）発光素子群、１００…スクリーン
  DESCRIPTION OF SYMBOLS 1 ... Image projector, 2, 2R, 2G, 2B ... Light source device, 3 ... Light source part, 4 ... Optical system, 5 ... Main part, 5a ... Connection part, 6 ... Light emitting element, 7 ... Collimator lens, 8 ... Light emission Element group, 10 ... image projection unit, 11 ... image optical system, 11a ... polarization beam splitter, 11b ... spatial modulation element, 11c ... dichroic prism, 11d ... reflection mirror, 12 ... projection optical system, 13 ... image projection main body, 13a ... connecting portion, 20 ... light guide, 61-69 ... (first to ninth) light emitting elements, 81-83 ... (first to third) light emitting element groups, 100 ... screen

Claims (3)

  1. 　複数の発光素子を備え、
    　前記複数の発光素子は、各発光素子の中心周波数ごとに複数の発光素子群に区分けされ、
    　前記発光素子群の中心周波数と隣接する他の発光素子群の中心周波数との中心周波数差は、前記複数の発光素子群におけるスペクトル半値全幅の平均値よりも大きく且つ１１．４ＴＨｚよりも小さい光源装置。     Comprising a plurality of light emitting elements,
    The plurality of light emitting elements are divided into a plurality of light emitting element groups for each central frequency of the light emitting elements,
    A light source device in which a center frequency difference between a center frequency of the light emitting element group and a center frequency of another light emitting element group adjacent to the light emitting element group is larger than an average value of full widths at half maximum of the plurality of light emitting element groups and smaller than 11.4 THz. .
  2. 　前記発光素子群の中心周波数と隣接する他の発光素子群の中心周波数との中心周波数差は、３．３ＴＨｚ以上であって且つ１０．４ＴＨｚ以下である請求項１に記載の光源装置。 The light source device according to claim 1, wherein a center frequency difference between a center frequency of the light emitting element group and a center frequency of another adjacent light emitting element group is 3.3 THz or more and 10.4 THz or less.
  3. 　請求項１又は２に記載の光源装置を備え、
    　前記光源装置から出射される光を投射光として用いる画像投影装置。
          The light source device according to claim 1 or 2,
    An image projection device that uses light emitted from the light source device as projection light.
PCT/JP2015/080224 2014-11-04 2015-10-27 Light source device and image projection device WO2016072319A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004503923A (en) * 2000-07-10 2004-02-05 コーポレーション　フォー　レーザー　オプティックス　リサーチ System and method for speckle reduction by bandwidth enhancement
WO2010029817A1 (en) * 2008-09-10 2010-03-18 日本電気株式会社 Light source device and image display device
JP2010212257A (en) * 1999-11-22 2010-09-24 Sony Corp Display

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010212257A (en) * 1999-11-22 2010-09-24 Sony Corp Display
JP2004503923A (en) * 2000-07-10 2004-02-05 コーポレーション　フォー　レーザー　オプティックス　リサーチ System and method for speckle reduction by bandwidth enhancement
WO2010029817A1 (en) * 2008-09-10 2010-03-18 日本電気株式会社 Light source device and image display device

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