WO2016140046A1 - Dispositif source de lumière et dispositif de projection d'image - Google Patents

Dispositif source de lumière et dispositif de projection d'image Download PDF

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Publication number
WO2016140046A1
WO2016140046A1 PCT/JP2016/054256 JP2016054256W WO2016140046A1 WO 2016140046 A1 WO2016140046 A1 WO 2016140046A1 JP 2016054256 W JP2016054256 W JP 2016054256W WO 2016140046 A1 WO2016140046 A1 WO 2016140046A1
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Prior art keywords
light source
light
laser
emitted
incident
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PCT/JP2016/054256
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English (en)
Japanese (ja)
Inventor
裕貴 山田
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ウシオ電機株式会社
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Publication of WO2016140046A1 publication Critical patent/WO2016140046A1/fr

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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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/48—Laser speckle optics
    • 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
    • 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
    • H01S5/40—Arrangement of two or more semiconductor lasers, not provided for in groups H01S5/02 - H01S5/30

Definitions

  • the present invention relates to a light source device including a plurality of light source units that emit laser light, and to an image projection device including the light source device.
  • a light source device that enters laser light emitted from a plurality of light source units into an optical fiber or the like is known (for example, Patent Document 1).
  • noise with the intensity of light called speckle noise is generated on the laser light irradiation surface and the retina of the observer.
  • Patent Document 1 a light source device has been proposed in which the wavelength of the laser beam emitted from the light source unit is widened in order to reduce speckle noise.
  • the light source device according to Patent Document 1 since there is a limit to the usable wavelength range, sufficient speckle noise reduction (also referred to as “despeckle effect” or “speckle contrast reduction”) can be obtained. There is no problem.
  • the light source device includes: a plurality of light source units that emit laser light; and an optical system that receives the laser light emitted from the plurality of light source units and emits the laser light toward the incident surface of the light guide.
  • the plurality of light source units are divided into a plurality of light source groups for each incident angle of the optical axis of the laser beam with respect to the incident surface, and the light source unit and the optical system are configured to transmit the laser light of the light source group. The smaller the incident angle, the larger the average value of the center wavelengths of the laser beams emitted from the light source units constituting the light source group.
  • the light source device includes a plurality of light source units that emit laser light and a light guide having an incident surface on which the laser light emitted from the plurality of light source units is incident.
  • the light source unit that is divided into a plurality of light source groups for each incident angle of the optical axis of the laser light with respect to the incident surface, and the light source unit that constitutes the light source group as the incident angle of the laser light of the light source group is smaller
  • the average value of the center wavelengths of the laser beams emitted from the laser beam is large.
  • the image projection apparatus includes at least one 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 a sufficient reduction in speckle noise can be obtained.
  • FIG. 1 is an overall schematic diagram of an image projection apparatus according to an embodiment. It is a schematic block diagram of the light source device which concerns on the same embodiment. It is a figure explaining the incident pattern of the light which injects into the optical system which concerns on the embodiment. It is a figure explaining the incident angle of the light in the entrance plane of the light guide which concerns on the embodiment. It is a figure which shows the relationship between the wavelength of each light source and light intensity which concern on the same embodiment. It is a figure explaining the measuring method of a speckle contrast. It is a comparison table of the speckle contrast in an example and a comparative example.
  • the dimensional ratio in the drawing does not necessarily match the actual dimensional ratio.
  • a light source device 2 As shown in FIG. 1, a light source device 2 according to this embodiment is used in an image projection device (for example, a projector) 1.
  • the image projection device 1 forms a light image with a plurality of (three in the present embodiment) light source devices 2 (2R, 2G, 2B) that emit light of different color wavelength regions and the light from the light source device 2.
  • an image projection unit 10 for projecting onto the screen 100.
  • 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 first light source device 2R emits light having a wavelength of 590 to 693 nm (especially 615 to 665 nm) in order to emit red light.
  • the second light source device 2G emits light having a wavelength of 498 to 580 nm (particularly, 520 nm to 555 nm) so as to emit green light.
  • the third light source device 2B emits light having a wavelength of 410 to 496 nm (particularly 445 to 475 nm) so as to emit blue light.
  • the image projection unit 10 receives the light emitted from each light source device 2 and forms an optical image, and the light image emitted from the image formation optical system 11 is incident and projected onto the screen 100.
  • a projection 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 forming 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 a space that forms an optical image by modulating the light emitted from the polarization beam splitter 11a. And a modulation element 11b.
  • the image forming optical system 11 includes a dichroic prism 11c that synthesizes light transmitted through each spatial modulation element 11b.
  • the image forming optical system 11 receives the reflection mirror 11d that reflects the laser light emitted from the first and third light source devices 2R and 2B, and the light emitted from the light source device 2, and converts the light into a polarization beam splitter. And a rod integrator 11e that emits toward 11a.
  • each spatial modulation element 11b is a transmissive liquid crystal element.
  • the image forming 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 laser light, an optical system 4 that receives light emitted from the plurality of light source units 3, and a main body unit that houses the plurality of light source units 3 and the optical system 4. And 5.
  • the light source device 2 also includes a light guide 6 on which light emitted from the optical system 4 is incident.
  • the main body 5 includes a connection portion 51 connected to one end of the light guide 6, and the image projection main body 13 includes a connection 13 a connected to the other end of the light guide 6. I have.
  • the light source unit 3 includes a light emitting element 3a that emits laser light and a collimator lens 3b that makes the laser light emitted from the light emitting element 3a substantially parallel.
  • the plurality of light source units 3 are arranged so that the optical axis A3 of the emitted light is parallel to at least when it enters the optical system 4.
  • the plurality of light source units 3 are arranged so that the optical axis A3 of the emitted light is at different positions on the optical incident surface 41 of the optical system 4.
  • the light emitting element 3a 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 light guide 6 includes a planar incident surface 61 on which light emitted from the optical system 4 is incident and a planar emission surface 62 that emits light toward the image projection unit 10.
  • the incident surface 61 of the light guide 6 is in a predetermined position with respect to the plurality of light source units 3 and the optical system 4. Positioned.
  • the light guide 6 is configured to propagate light along the longitudinal direction while maintaining the angle at which the light incident on the incident surface 61 travels by totally reflecting the light on its side surface.
  • the light guide 6 is an optical fiber including a core that is a core, a cladding that is disposed outside the core and has a refractive index lower than that of the core, and a coating that covers the cladding.
  • the light guide 6 is not limited to an optical fiber, and may be, for example, a rod integrator.
  • the optical system 4 is a focusing lens that focuses light emitted from the plurality of light source units 3 toward the center of the incident surface 61 of the light guide 6.
  • the light emitted from the plurality of light source units 3 is incident on the incident surface 61 of the light guide 6 via the optical system 4.
  • the optical system 4 changes the optical axis of the light emitted from each light source unit 3 so as to face the center of the incident surface 61 of the light guide 6.
  • the plurality of light source sections 3 are divided into a plurality of light source groups 7.
  • the plurality of light source units 3 are divided into two groups, that is, a first light source group 71 and a second light source group 72. And each light source group 71 and 72 is divided so that the light source parts 3 may become the same number (12 pieces).
  • the first light source group 71 includes a plurality (twelve) of first light source units 31 that emit laser light L31 toward an outer position on the optical incident surface 41 of the optical system 4.
  • the second light source group 72 includes a plurality of (eight) second light source units 32 that emit laser beams L32 toward an inner position on the optical incident surface 41 of the optical system 4 than the first light source unit 31.
  • a plurality of (four) third light source units 33 that emit laser light L33 toward the inner position on the optical incident surface 41 of the optical system 4 than the second light source unit 32 are provided.
  • the optical system 4 focuses the laser beams L31 to L33 from the light source units 31 to 33 toward the center of the incident surface 61 of the light guide 6.
  • the laser beams L31 to L33 are incident on the incident surface 61 of the light guide 6 as the incident positions of the laser beams L31 to L33 on the optical incident surface 41 of the optical system 4 are further away from the center of the optical incident surface 41.
  • Incident angles ⁇ 31 to ⁇ 33 of the optical axes A31 to A33 are increased.
  • FIG. 3 shows the incident positions of the laser beams L31 to L33 with respect to the optical incident surface 41 of the optical system 4.
  • the broken line indicates the position at the same distance from the center of the optical incident surface 41
  • the alternate long and short dash line indicates the dividing boundary line between the first light source group 71 and the second light source group 72.
  • the first incident angle ⁇ 31 at which the optical axis A31 of the laser light L31 emitted from the first light source unit 31 enters the incident surface 61 of the light guide 6 is the optical axis of the laser light L32 emitted from the second light source unit 32.
  • A32 is larger than the second incident angle ⁇ 32 incident on the incident surface 61 of the light guide 6.
  • the second incident angle ⁇ 32 is larger than the third incident angle ⁇ 33 at which the optical axis A33 of the laser light L33 of the third light source unit 33 is incident on the incident surface 61 of the light guide 6.
  • the plurality of light source units 3 includes a plurality of light source groups 71 and 72 for each of the incident angles ⁇ 31 to ⁇ 33 at which the optical axes A31 to A33 of the laser beams L31 to L33 are incident on the incident surface 61 of the light guide 6. It is divided into.
  • FIG. 5 shows the spectral distribution of the light intensity with respect to the wavelength in the second light source device 2G.
  • the broken line S71 indicates the spectral distribution of each light source unit 3 (light emitting element 3a) of the first light source group 71
  • the solid line S72 indicates the spectral distribution of each light source unit 3 (light emitting element 3a) of the second light source group 72.
  • each light source unit 3 (light emitting element 3a) is configured such that the spectrum distribution has substantially the same shape (for example, the same maximum light intensity and the same spectrum full width at half maximum).
  • the average value of the center wavelengths of the laser beams L32 and L33 emitted from each light source unit 3 constituting the second light source group 72 is the center wavelength of the laser beam L31 emitted from the light source unit 3 constituting the first light source group 71. It is larger than the average value.
  • the average value of the center wavelengths of the laser beams L31 in each light source unit 3 of the first light source group 71 is 520 nm
  • the centers of the laser beams L32 and L33 in each light source unit 3 of the second light source group 72 are.
  • the average value of the wavelength is 523 nm.
  • the range of the center wavelength of the laser light L31 in each light source unit 3 of the first light source group 71 is 519 nm to 521 nm
  • the laser light L32 in each light source unit 3 of the second light source group 72 The range of the central wavelength of L33 is 522 nm to 524 nm. Therefore, the range of the center wavelength of the laser light L31 in each light source unit 3 of the first light source group 71 does not overlap with the range of the center wavelengths of the laser beams L32 and L33 in each light source unit 3 of the second light source group 72.
  • the incident angle ⁇ 31 of the laser light L31 on the light guide 6 in the first light source group 71 is larger than the incident angles ⁇ 32 and ⁇ 33 of the laser light L32 and L33 on the light guide 6 in the second light source group 72. . Therefore, the smaller the incident angles ⁇ 31 to ⁇ 33 of the laser beams L31 to L33 of the light source groups 71 and 72 to the light guide 6, the smaller the laser beams L31 to L33 emitted from the light source unit 3 constituting the light source groups 71 and 72.
  • the average value of the center wavelengths is large.
  • the center wavelength of the laser light emitted from each light source unit 3 is a wavelength that is the center of the full width at half maximum of the spectrum (the wavelength width at which the relative light intensity is 50% of the peak value) in the spectrum distribution.
  • the center wavelength of the laser light emitted from each light source unit 3 may be a peak wavelength (a wavelength at which the relative light intensity becomes a peak value) in the spectrum distribution.
  • the average value of the center wavelengths of the laser beams L31 to L33 emitted from the light source units 3 constituting the light source groups 71 and 72 is radiated.
  • the average value of the center wavelengths of a laser beam having a radiation power of 1 and a center wavelength of 522 nm and a laser beam having a radiation power of 2 and a center wavelength of 525 nm is 524 nm.
  • the first and third light source devices 2R and 2B have the same configuration as the second light source device 2G. That is, as the incident angles ⁇ 31 to ⁇ 33 of the laser beams L31 to L33 of the light source groups 71 and 72 are smaller, the average value of the center wavelengths of the laser beams L31 to L33 emitted from the light source unit 3 constituting the light source groups 71 and 72 is reduced. Is getting bigger.
  • 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. 6 and 7 regarding the operation of the image projection device 1 and the light source device 2 according to the present embodiment. And verify.
  • the verification apparatus 200 is an apparatus that simplifies the configuration of the image projection apparatus 1 in order to verify the operation of the image projection apparatus 1 according to the present embodiment.
  • the verification device 200 includes two light source units 3, 3, an optical system 4, a light guide 6, a rod integrator 11 e, and a projection optical system 12.
  • the light emitting element 3a of each light source unit 3 is an array type semiconductor laser having 24 emitters.
  • the incident angle of the laser light emitted from the first light source unit 31 to the light guide 6 is 10 °, and the incident angle of the laser light emitted from the second light source unit 32 to the light guide 6 is 0. °. That is, in the verification device 200, the first light source unit 31 constitutes a first light source group 71, and the second light source unit 32 constitutes a second light source group 72.
  • the laser light irradiated on the screen 100 having a gain exceeding 1 was imaged by the CCD camera 201, and the speckle contrast was calculated from the captured image.
  • the speckle contrast was the ratio of the standard deviation to the average value of the CCD count at each pixel of the image. Further, the speckle contrast was calculated as an average value when only one light source unit 31, 32 was emitted, and a case where the two light source units 31, 32 were emitted simultaneously.
  • the center wavelength of the laser beam emitted from the first light source unit 31 is 520 nm
  • the center wavelength of the laser beam emitted from the second light source unit 32 is 523 nm. is there. That is, the smaller the incident angle of the laser light to the light guide 6 of the light source parts 31, 32, the larger the center wavelength of the laser light emitted from the light source parts 31, 32.
  • the center wavelength of the laser light emitted from the first light source unit 31 is 526 nm
  • the center wavelength of the laser light emitted from the second light source unit 32 is 523 nm. That is, contrary to the embodiment, the smaller the incident angle of the laser beam to the light guide 6 of the light source units 31, 32, the smaller the center wavelength of the laser beam emitted from the light source units 31, 32. .
  • the Example has suppressed generation
  • Increasing the average value of the center wavelengths of L32 and L33 increases the average value of the center wavelengths of the laser light L31 emitted from the light source unit 31 constituting the first light source group 71 having a larger incident angle ⁇ 31 to the light guide 6.
  • the generation of speckle noise can be suppressed rather than increasing the value.
  • the scattered wave on the screen 100 has a phase distribution 2 ⁇ ⁇ x ⁇ sin ⁇ 1 / ⁇ 1, 2 ⁇ ⁇ x ⁇ sin ⁇ 2 / ⁇ 2 proportional to sin ⁇ 1 / ⁇ 1 and sin ⁇ 2 / ⁇ 2.
  • the phase distribution 2 ⁇ ⁇ x ⁇ sin ⁇ 1 / ⁇ 1, 2 ⁇ ⁇ x ⁇ sin ⁇ 2 / ⁇ 2 indicates a one-dimensional phase distribution in the predetermined direction x on the screen 100.
  • the generation of speckle noise can be suppressed by increasing the difference between the combinations sin ⁇ 1 / ⁇ 1 and sin ⁇ 2 / ⁇ 2 between the wavelengths ⁇ 1, ⁇ 2 of the two laser beams and the incident angles ⁇ 1, ⁇ 2.
  • the generation of speckle noise can be suppressed by increasing the wavelengths ⁇ 1 and ⁇ 2 for laser beams having smaller incident angles ⁇ 1 and ⁇ 2.
  • the image projection apparatus 1 includes at least one light source device 2 (specifically, three), and uses light emitted from the light source device 2 as projection light.
  • a plurality of light source units 3 that emit laser beams and laser beams L31 to L33 emitted from the plurality of light source units 3 are incident, and the laser beams L31 to L33 are emitted.
  • an optical system 4 that emits light toward an incident surface 61 of the light guide 6.
  • the plurality of light source units 3 includes incident angles ⁇ 31 to ⁇ of the optical axes A31 to A33 of the laser beams L31 to L33 with respect to the incident surface 61.
  • the light source unit 3 and the optical system 4 are divided into a plurality of light source groups 7 according to the magnitude of ⁇ 33.
  • the light source group 3 and the optical system 4 have a smaller incident angle ⁇ 31 to ⁇ 33 of the laser beams L31 to L33 of the light source group 7, 7 is configured such that the average value of the center wavelengths of the laser beams L31 to L33 emitted from the light source unit 3 constituting the unit 7 increases.
  • the light source device 2 has a light guide having a plurality of light source units 3 that emit laser beams and an incident surface 61 on which the laser beams L31 to L33 emitted from the plurality of light source units 3 are incident. And the plurality of light source units 3 are divided into a plurality of light source groups 7 for each of the incident angles ⁇ 31 to ⁇ 33 of the optical axes A31 to A33 of the laser beams L31 to L33 with respect to the incident surface 61.
  • the incident angles ⁇ 31 to ⁇ 33 of the laser beams L31 to L33 of the light source group 7 are smaller, the average value of the center wavelengths of the laser beams L31 to L33 emitted from the light source unit 3 constituting the light source group 7 is smaller. large.
  • the incident angles ⁇ 31 to ⁇ 33 of the laser beams L31 to L33 of the light source group 7 are smaller, the average of the center wavelengths of the laser beams L31 to L33 emitted from the light source unit 3 constituting the light source group 7 is decreased. Since the value is large, the generation of speckle noise can be suppressed. Therefore, a sufficient reduction in speckle noise can be obtained.
  • 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 image projection device and the light source 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 plurality of light source groups 71 and 72 are arranged so that the number of the light source units 3 is the same, that is, based on the number of the light source units 3 (laser beams L31 to L33). In this configuration, the light source unit 3 is divided into incident angles ⁇ 31 to ⁇ 33.
  • the light source device is not limited to such a configuration.
  • the plurality of light source groups 7 are divided into a plurality of light source units 3 according to incident angles ⁇ 31 to ⁇ 33 based on angles or solid angles divided at equal intervals. It may be configured. In short, in the light source device, the plurality of light source groups 7 may have a configuration in which the plurality of light source units 3 are divided according to the incident angles ⁇ 31 to ⁇ 33.
  • the light source groups 71 and 72 are divided into two.
  • the light source device is not limited to such a configuration.
  • the light source device may have a configuration in which the light source group 7 is divided into three or more.
  • the light source unit 3 includes the collimating lens 3b.
  • the light source device is not limited to such a configuration.
  • the light source unit 3 may not include the collimating lens 3b but may be an external resonator type semiconductor laser.
  • the light source device 2 is configured to include the optical system 4.
  • the light source device is not limited to such a configuration.
  • the light source device may not include the optical system 4 and may be configured such that the laser light emitted from the light source unit 3 is directly incident on the incident surface 61 of the light guide 6.
  • the image projection device 1 has a configuration including three light source devices 2R, 2G, and 2B.
  • the image projector is not limited to such a configuration.
  • the image projection apparatus may have a configuration including one light source device 2, a configuration including two light source devices 2, and a configuration including four or more light source devices 2.
  • a plurality of light source devices 2 are provided, and are configured to emit light of the first to third colors toward the image projection unit 10 in a separated state.
  • the light source device is not limited to such a configuration.
  • the light source device may be configured to emit light toward the image projection unit 10 in a state where the first to third color lights are combined.
  • the light guide 6 is configured to be detachable from the main body 5.
  • the light source device is not limited to such a configuration.
  • the light guide 6 may be fixed so as not to be attached to and detached from the main body 5, for example, may be configured integrally with the main body 5.
  • the range of the center wavelength of the laser light in each light source unit 3 of the first light source group 71 is the center wavelength of the laser light in each light source unit 3 of the second light source group 72. It is a configuration that does not overlap the range.
  • the light source device is not limited to such a configuration.
  • the range of the center wavelength of the laser light in each light source unit 3 of the first light source group 71 overlaps the range of the center wavelength of the laser light in each light source unit 3 of the second light source group 72. It may be configured as follows.
  • Dichroic prism 11d reflection mirror
  • 11e rod integrator
  • 12 projection optical system
  • 13 image projection main body
  • 13a connection unit
  • 31 first light source unit
  • 32 second light source unit
  • 33 third light source unit
  • DESCRIPTION OF SYMBOLS 41 ... Optical entrance surface, 51 ... Connection part, 61 ... Incident surface, 62 ... Outgoing surface, 71 ... 1st light source group, 72 ... 2nd light source group, 100 ... Screen, 200 ... Verification apparatus, 201 ... CCD camera

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Projection Apparatus (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Semiconductor Lasers (AREA)

Abstract

La présente invention a trait à un dispositif de projection d'image qui comprend au moins un dispositif source de lumière, et qui utilise comme lumière de projection la lumière émise par un dispositif source de lumière. Le dispositif source de lumière inclut une pluralité d'unités sources de lumière qui émet de la lumière laser. La pluralité d'unités sources de lumière est divisée en une pluralité de groupes de sources de lumière selon la grandeur des angles d'incidence sur la surface d'incidence de l'axe optique pour la lumière laser. Plus l'angle d'incidence de la lumière laser provenant du groupe de sources de lumière est petit, plus la valeur moyenne de la longueur d'onde centrale de la lumière laser émise par les unités sources de lumière constituant le groupe de sources de lumière est grande.
PCT/JP2016/054256 2015-03-04 2016-02-15 Dispositif source de lumière et dispositif de projection d'image WO2016140046A1 (fr)

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JP2015042164A JP2016161846A (ja) 2015-03-04 2015-03-04 光源装置及び画像投影装置
JP2015-042164 2015-03-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080218699A1 (en) * 2007-03-08 2008-09-11 Samsung Electro-Mechanics Co., Ltd. Display device having plurality of light sources and using diffractive light modulator, capable of reducing speckles
WO2012139634A1 (fr) * 2011-04-12 2012-10-18 Barco N.V. Projecteur à laser avec mouchetures réduites
JP2015052626A (ja) * 2013-09-05 2015-03-19 ウシオ電機株式会社 レーザ光源装置及び画像投影装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080218699A1 (en) * 2007-03-08 2008-09-11 Samsung Electro-Mechanics Co., Ltd. Display device having plurality of light sources and using diffractive light modulator, capable of reducing speckles
WO2012139634A1 (fr) * 2011-04-12 2012-10-18 Barco N.V. Projecteur à laser avec mouchetures réduites
JP2015052626A (ja) * 2013-09-05 2015-03-19 ウシオ電機株式会社 レーザ光源装置及び画像投影装置

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