WO2022142218A1 - 激光光源装置和投影设备 - Google Patents

激光光源装置和投影设备 Download PDF

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Publication number
WO2022142218A1
WO2022142218A1 PCT/CN2021/103532 CN2021103532W WO2022142218A1 WO 2022142218 A1 WO2022142218 A1 WO 2022142218A1 CN 2021103532 W CN2021103532 W CN 2021103532W WO 2022142218 A1 WO2022142218 A1 WO 2022142218A1
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Prior art keywords
laser
light source
source device
fly
lens
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PCT/CN2021/103532
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English (en)
French (fr)
Inventor
李巍
田有良
唐甜甜
Original Assignee
青岛海信激光显示股份有限公司
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Priority to CN202180083717.5A priority Critical patent/CN116635757A/zh
Publication of WO2022142218A1 publication Critical patent/WO2022142218A1/zh
Priority to US17/936,502 priority patent/US20230028602A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2033—LED or laser light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
    • G02B19/0057—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode in the form of a laser diode array, e.g. laser diode bar
    • 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
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G02B27/0961—Lens arrays
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • 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
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
    • 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
    • G02B27/30—Collimators
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0006—Arrays
    • G02B3/0037—Arrays characterized by the distribution or form of lenses
    • G02B3/0062—Stacked lens arrays, i.e. refractive surfaces arranged in at least two planes, without structurally separate optical elements in-between
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2013—Plural light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/206—Control of light source other than position or intensity
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2066—Reflectors in illumination beam
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light
    • 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

Definitions

  • the present application relates to the field of laser display, in particular to a laser light source device and projection equipment.
  • a first aspect of the embodiments of the present application provides a laser light source device, the device includes a laser array, a light-conducting component, and a fly-eye lens sequentially arranged along an optical path direction, and the fly-eye lens includes a plurality of rectangular lenses arranged in an array;
  • the laser array includes a plurality of lasers arranged in an array, the fast axis direction of the lasers is parallel to the short side of the rectangular lens in the fly-eye lens, and the slow axis direction of the laser is parallel to the rectangular lens in the fly-eye lens.
  • the long sides of the laser are parallel, and the sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens, and the sine value of the divergence angle of the slow axis of the laser is greater than the rectangular lens.
  • the sine of the aperture angle of the short side is parallel to the fast axis direction of the lasers is parallel to the short side of the rectangular lens in the fly-eye lens
  • the slow axis direction of the laser is parallel to the rectangular lens in the fly-eye lens.
  • the long sides of the laser are parallel, and the sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular
  • a projection device in a second aspect of the embodiments of the present application, includes: the above-mentioned laser light source device.
  • FIG. 1 is a schematic structural diagram of a laser light source device provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of a laser array of the laser light source device shown in FIG. 1;
  • FIG. 3 is a schematic structural diagram of a fly-eye lens of the laser light source device shown in FIG. 1;
  • FIG. 4 is an optical path diagram of a laser light source device provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a beam reduction system in the laser light source device shown in FIG. 1;
  • FIG. 6 is a schematic structural diagram of a fly-eye lens in the laser light source device shown in FIG. 1;
  • FIG. 7 is a schematic structural diagram of a projection device according to an embodiment of the present application.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as “first” or “second” may expressly or implicitly include one or more of that feature.
  • plural means two or more.
  • FIG. 1 is a schematic structural diagram of a laser light source device provided by an embodiment of the present application.
  • the laser light source device 1 includes a laser array 11 , a light conduction component 12 and a fly-eye lens 13 arranged in sequence along the direction of the optical path.
  • the lens 13 includes a plurality of rectangular lenses arranged in an array.
  • the laser array 11 emits light beams
  • the light guide assembly 12 is used for receiving the light beams emitted by the laser array 11 and guiding the light beams to the fly-eye lens 13 .
  • the laser array 11 includes a plurality of lasers arranged in an array, the fast axis direction of the laser is parallel to the short side of the rectangular lens in the fly-eye lens 13, the slow axis direction of the laser is parallel to the long side of the rectangular lens in the fly-eye lens 13, and the laser
  • the sine value sin ⁇ 1 of the divergence angle of the fast axis is greater than the sine value sin ⁇ 1 of the aperture angle ⁇ 1 of the long side of the rectangular lens, that is, sin ⁇ 1 >sin ⁇ 1 ;
  • the sine value sin ⁇ 2 of the divergence angle ⁇ 2 of the slow axis of the laser is greater than
  • the sine value of the aperture angle ⁇ 2 of the short side of the rectangular lens is sin ⁇ 2 , that is, sin ⁇ 2 >sin ⁇ 2 .
  • FIG. 2 is a schematic structural diagram of the laser array of the laser light source device shown in FIG. 1.
  • the fast axis direction of the laser in the laser array of the laser light source device provided in the embodiment of the present application is f1
  • the slow axis direction is f1.
  • f2 the slow axis direction
  • the divergence angle of the laser is used to measure the speed at which the beam diverges from the beam waist (the beam waist refers to the position where the beam radius is the smallest in the beam propagation direction, and the beam radius at this position is called the beam waist radius).
  • the divergence angle of the laser can be measured by measuring the defocusing degree of the beam, that is, a beam analyzer is used to measure the beam radius at different positions, and then the divergence angle of the laser can be obtained.
  • FIG. 3 is a schematic structural diagram of the fly-eye lens of the laser light source device shown in FIG. 1 .
  • the fly-eye lens 13 includes a plurality of rectangular lenses 131 arranged in an array.
  • the fly-eye lens divides the beam into N (the value of N is the number of rectangular lenses in the fly-eye lens) channels through each rectangular lens, and the beam of each channel illuminates the entire object surface independently, that is, the illumination of the object surface is the illumination of each channel. superposition, thus greatly improving the uniformity of the illuminated object surface.
  • fly-eye lens In the application of fly-eye lens, two columns of fly-eye lens arrays are arranged in parallel, the focus of each rectangular lens in the first column of fly-eye lens array coincides with the center of the corresponding rectangular lens in the second column of fly-eye lens array, and the two-row fly-eye lens array
  • the optical axes of the laser beams are parallel to each other, and the beam spot of the input laser beam can be divided, and then the divided beam spots are accumulated by the subsequent focusing lens, so as to realize the homogenization of the beam and the optimization of the beam spot.
  • the volume of the fly-eye lens as a light homogenizing device is relatively small, so that the volume of the laser light source device can be correspondingly reduced, and the volume of the projection equipment using the laser light source device can be further reduced, so that the overall projection device is lighter, thinner and more beautiful, and the user experience is better. it is good.
  • the embodiments of the present application provide a laser light source device
  • the laser light source device includes a laser array, a light conduction component and a fly-eye lens
  • the laser array includes a plurality of lasers arranged in an array
  • the fly-eye lens includes a plurality of rectangular lenses
  • the sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens
  • the sine value of the divergence angle of the slow axis is greater than the sine value of the aperture angle of the short side of the rectangular lens.
  • the parameters of the laser are correlated with the parameters of the fly-eye lens, so that the function of uniform light can be realized by the fly-eye lens.
  • the size will also be smaller.
  • the problem that the volume of the laser light source device is too large in the related art is solved, and the effect of reducing the volume of the laser light source device is achieved.
  • the laser array 11 includes a plurality of lasers 111
  • the fly-eye lens 13 includes a plurality of rectangular lenses 131 arranged in an array
  • the spot area of the laser 111 is larger than that of the rectangular lenses 131 .
  • the spot area S 2 of the laser 111 is larger than the area S 1 of the rectangular lens 131 , that is, S 2 >S 1 .
  • the light spot of the laser passes through the rectangular lens among the plurality of fly-eye lenses, so that the light spot is divided as many times as possible, so as to achieve the uniform light requirement of the laser beam.
  • the spot area S 2 of the laser is larger than the area S 1 of the rectangular lens three times, that is, S 2 >3S 1 .
  • the light spot of the laser can pass through at least a plurality of rectangular lenses, so that the light spot of the laser core device is divided into multiple parts by the rectangular lens in the fly-eye lens, and then the divided light spots are superimposed by the subsequent focusing lens, so as to realize the light beam. Homogenize.
  • the sine value sin ⁇ 1 of the divergence angle of the fast axis of the laser is greater than the sine value sin ⁇ 2 of the divergence angle of the slow axis of the laser.
  • the divergence angle of the fast axis of the output beam of the array laser may range from 40 degrees to 90 degrees, and the divergence angle of the slow axis may be 10 degrees.
  • the laser array 11 includes lasers 111 for emitting lasers of three colors, namely, a red laser 111a for emitting red lasers, a blue laser 111b for emitting blue lasers, and a laser 111b for emitting blue lasers, respectively.
  • the green laser 111c of the green laser The red laser light emitted by the red laser 111a may have a wavelength of 638 nanometers to 650 nanometers.
  • the laser wavelength range of the blue laser 111b may be 445 nanometers to 450 nanometers, and the laser wavelength range of the green laser 111c may be 532 nanometers to 556 nanometers.
  • the wavelength of the laser light refers to the wavelength of the output laser light of the laser.
  • the laser 111 includes two groups of red lasers 111a, one group of blue lasers 111b and one group of green lasers 111c.
  • the arrangement of the lasers in the laser is that seven lasers are arranged in one row, and there are four rows in total. The first row is arranged as the green laser 111c, the second row is arranged as the blue laser 111b, the third row and Four rows are provided as red lasers 111a.
  • the fast axis direction f1 of the laser 111 is parallel to the column direction of the laser 111
  • the slow axis direction f2 is parallel to the row direction of the laser 111 .
  • red laser, blue laser and green laser emitted by the red laser 111a, the blue laser 111b and the green laser 111c are called three primary color lights, which are respectively R (Red), B (Blue) and G (Green) in English.
  • Various colors in nature can be obtained by changing the frequency and intensity of the three primary colors of light, and then combining them.
  • white light can be formed by mixing red laser, blue laser and green laser in equal proportions.
  • the sine value sin ⁇ 1 of the aperture angle ⁇ 1 of the long side of the rectangular lens is greater than the sine value sin ⁇ 2 of the aperture angle ⁇ 2 of the short side of the rectangular lens.
  • FIG. 4 is an optical path diagram of a laser light source device provided by an embodiment of the present application.
  • the light conducting component 12 includes a stepped mirror 121 , and the stepped mirror 121 includes a reflecting mirror 1211 and a dichroic plate 1212 .
  • the reflecting mirror 1211 is located between the green laser 111 c and the fly-eye lens 13 , and the reflecting mirror 1211 is used to deflect the light path and guide the green laser light emitted by the green laser 111 c to the dichroic plate 1212 .
  • the dichroic plate 1212 includes a first dichroic plate 1212a and a second dichroic plate 1212b. As shown in FIG. 4 , the first dichroic plate 1212a is located between the blue laser 111b and the fly-eye lens. 13, the second dichroic plate 1212b is located between the two groups of red lasers 111a and the fly-eye lens 13.
  • dichroic film also known as light combiner
  • light combiner is a color filter that can be used to selectively transmit light of a certain color and reflect other color light.
  • the transmittance of dichroic film to transmitted light High (transmittance up to 97%) and high reflection efficiency for reflected light (reflection efficiency greater than 99%), at the same time, it has the advantages of small absorption, less dispersion, less laser loss and no film surface.
  • the first dichroic plate 1212a is used to reflect the blue laser light emitted by the blue laser 111b and transmit the green laser light emitted by the green laser 111c; the second dichroic plate 1212b is used to reflect the red laser light emitted by the red laser 111a and transmit the first The blue laser light and the green laser light emitted from the dichroic plate 1212a.
  • the blue laser reflected by the first dichroic plate 1212 a and the transmitted green laser are co-directional, and the direction y is perpendicular to the output direction x of the laser 111 .
  • the red laser reflected by the second dichroic plate 1212b and the transmitted green and blue lasers are co-directional, and the direction y is perpendicular to the output direction x of the laser 111 .
  • the red laser, blue laser and green laser emitted by the laser are combined by the light-conducting component 12, and at the same time, the light-conducting component 12 also turns the laser light path, shortening the laser light path when it exits parallel to the laser 111.
  • the distance in the direction makes the arrangement of the components in the laser light source device compact, and the space utilization rate is high, which can reduce the volume of the laser light source device and reduce the weight of the system to meet the requirements of miniaturization of the laser light source device.
  • the reflector 1211 in the light guide assembly 12 can be positioned at 45 degrees. That is, when the green laser light emitted by the green laser 111c is incident on the reflecting mirror 1211, the incident angle is 45 degrees.
  • the dichroic plate 1212 in the laser light source device shown in the embodiment of the present application may be a 45-degree dichroic plate, that is, the dichroic plate is placed at an angle of 45 degrees to the output direction x of the laser 111 .
  • the laser light source device 1 further includes a collimating mirror 14 , and the collimating mirror 14 is located between the laser array 11 and the light conducting component 12 .
  • the laser array 11 emits three-color light beams, and the three-color light beams enter the collimating mirror 14 .
  • the collimating mirror 14 is used to collimate the laser beam in the optical path and form a parallel outgoing laser. Due to the characteristics of the laser itself, the laser beam emitted by the laser array 11 may have uneven intensity distribution, such as bright spots or stripes of various shapes, which can be passed through.
  • the parallel output effect of the collimating mirror 14 forms a parallel laser beam, and then the light path is turned and the three-color laser light is combined through the light conducting component 12. This structure reduces the spatial coherence of the laser beam and suppresses the laser speckle .
  • the laser light source device 1 further includes a diffusing component 15, the diffusing component 15 is located between the light conducting component 12 and the fly-eye lens 13, and the diffusing component 15 includes a diffusing wheel or a diffusing sheet.
  • the light source is a pure three-color laser light source
  • the laser will appear speckle (the speckle phenomenon refers to the object illuminated by the laser, and its surface presents a granular structure).
  • the laser is highly coherent. Therefore, when the laser is reflected from the surface of the object, the vibrations from each point on the object to the observation point are coherent, and the light field of the observation point is the superposition of coherent wavelets emitted by various points on the rough surface.
  • the diffusing component 15 may be a diffusing wheel or a diffusing sheet, which is used to perform uniform light treatment on the three-color laser, so as to reduce uneven energy distribution of the laser spot.
  • the diffusing wheel When the diffusing wheel is working, it rotates along its axis with a certain frequency, and the rotating diffusing wheel can generate some random phases to the laser beam in space, which can interfere with the coherence of the laser. Thereby reducing the phenomenon of uneven distribution of laser spot.
  • the laser light source device 1 further includes a beam reduction system 16 , and the beam reduction system 16 is located between the light transmission system 12 and the fly-eye lens 13 . If the spot size of the laser light emitted by the laser 111 is too large, the laser light emitted by the laser 111 can be subjected to beam reduction processing, thereby improving the diffusion efficiency.
  • 5 is a schematic structural diagram of a beam reduction system in the laser light source device shown in FIG. 1 . As shown in FIG.
  • the beam reduction system 16 includes a group of lens group structures 161 , and the lens group structure 161 includes a concave lens 1611 and a convex lens 1612, the optical axis of the concave lens 1611 coincides with the optical axis of the convex lens 1612.
  • the convex lens 1612 is used to receive the incident light beam whose incident direction is parallel to the optical axis of the convex lens 1612, condense the incident light beam and reflect it to the concave lens 1611; direction outgoing beam.
  • the light beam with a larger diameter is converged by the convex lens and emitted to the concave lens, and the concave lens diverges the light beam to form an outgoing light beam with a small diameter, which can achieve the beam reduction effect.
  • the laser light source device 1 further includes a diffusing component 15 and a beam reducing system 16 .
  • the laser light source device may include both a diffusing component 15 and a condensing system 16 , wherein the condensing system 16 is located between the diffusing component 15 and the light conducting component 12 .
  • the laser light source device 1 further includes a half-wave plate 17 .
  • the half-wave plate 17 is located between the two groups of red lasers 111a and the second dichroic plate 1212b, and the plane of the half-wave plate 17 is perpendicular to the direction of the beam emitted by the red laser 111a.
  • the half-wave plate can change the polarization direction of the laser polarized light, thereby improving the light processing consistency of the projection optical system and the projection screen for the three-color laser, and further solving the color cast such as "color spots" or "color blocks” in the three-color laser projection screen. question.
  • the fly-eye lens 13 includes a first fly-eye lens 131 and a second fly-eye lens 132 arranged in parallel.
  • the lens 131 is used for receiving the light beam emitted by the light conducting component 12
  • the second fly-eye lens 132 is used for outputting the homogenized light beam.
  • the number of rectangular lenses on the first fly-eye lens 131 and the second fly-eye lens 132 are equal in number and correspond one-to-one.
  • the light beam enters the first fly-eye lens 131 perpendicularly in the y direction and forms a parallel beam parallel to the optical axis.
  • the light beam passes through the first fly-eye lens 131 and is focused to the center of the second fly-eye lens 132
  • a fly-eye lens 131 forms a plurality of light source images to illuminate the light source, each rectangular lens of the second fly-eye lens 132 overlaps the corresponding rectangular lens on the first fly-eye lens 131 for imaging, and the light spot emitted by the second fly-eye lens 132 is captured by a subsequent condenser lens. Focus on the display.
  • the first row of fly-eye lenses 131 divides the entire wide beam of the light source into a plurality of beamlets. Due to the overlapping of the beamlets in symmetrical positions, the slight unevenness in the range of each beamlet is compensated, so that the entire The light energy in the aperture is effectively and uniformly utilized to realize the homogenization of the light beam.
  • the first fly-eye lens may be integrally formed with the second fly-eye lens through a substrate.
  • the substrate material may be glass material or other light-transmitting material.
  • the first fly-eye lens is located on one side of the substrate, and the second fly-eye lens is located on the other side of the substrate.
  • the embodiments of the present application provide a laser light source device
  • the laser light source device includes a laser array, a light conduction component and a fly-eye lens
  • the laser array includes a plurality of lasers arranged in an array
  • the fly-eye lens includes a plurality of rectangular lenses
  • the sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens
  • the sine value of the divergence angle of the slow axis is greater than the sine value of the aperture angle of the short side of the rectangular lens.
  • the parameters of the laser are correlated with the parameters of the fly-eye lens, so that the function of uniform light can be realized by the fly-eye lens.
  • the size will also be smaller.
  • the problem that the volume of the laser light source device is too large in the related art is solved, and the effect of reducing the volume of the laser light source device is achieved.
  • FIG. 7 is a schematic structural diagram of a projection device shown in an embodiment of the present application.
  • the projection device includes a reflector 2 , a light valve 3 , and a total reflection prism. 4.
  • the laser light source device 1 , the reflection mirror 2 , the light valve 3 , the total reflection prism 4 , the galvanometer 5 and the lens assembly 6 are arranged in sequence along the direction of the optical path.
  • the laser light source device 1 is used to provide the illumination beam
  • the reflector 2 is used to turn the beam provided by the laser light source device 1
  • the total reflection prism 4 is used to receive the beam derived from the reflector 2 and guide it to the light valve 3
  • the light valve 3 is used to receive the light beam and modulate it to form an image light beam, and then cooperate with the galvanometer 5 and the total reflection prism 4 to guide the light beam to the lens assembly 6, and the lens assembly 6 is used to receive the image beam and correct and amplify the image beam and then project it to the image beam.
  • the galvanometer 5 is located between the total reflection prism 4 and the lens assembly 6, and the total reflection prism 4 is used to send the image beam modulated and shaped by the light valve 3 to the galvanometer 5, and the galvanometer 5 vibrates at a preset frequency, so that through the vibration The beams of the mirror 5 are superimposed with misalignment and enter the lens assembly 6 .
  • a light valve (English: digital micromirror device, DMD for short) is a digital micromirror element that can digitally modulate light.
  • the light valve includes an array of multiple high-speed digital light-reflecting micromirrors. This array corresponds to the light in the projected image.
  • the micro-electrodes under each micro-mirror are activated by digital signals, and the micro-electrodes will push the mirror surface of the micro-mirror to face or avoid the light source.
  • the mirror surface of the micro-mirror faces the light source (that is, the micro-mirror is turned on)
  • a white pixel The dots are reflected to the screen in the projection device through the lens assembly.
  • the mirror surface of the micromirror avoids the light source (that is, the micromirror is turned off)
  • the position of the micromirror pixel on the screen appears dark. Therefore, multiple small mirrors in the light valve correspond to one pixel one by one, and the number of mirrors determines the display resolution of the light valve.
  • the micromirror array arrangement may be 4096*2160.
  • the opening and closing speed of the mirror surface of the micromirror can be 5000 times/second (that is, the mirror surface of the micromirror in the light valve can be rotated thousands of times in one second). Therefore, by exchanging the opening and closing times of each micromirror, different levels can be generated. grayscale. For example, when the micromirror is turned on for a longer time than it is turned off, the generated grayscale pixels are lighter; when the micromirror is turned off for a longer time than it is turned on, the generated grayscale pixels are darker.
  • each micromirror reflect light by rotating, and the rotation of each micromirror is controlled by a microelectrode located under each micromirror. Meanwhile, each micromirror reflects only one color during one rotation. For example, a micromirror that projects purple pixels is only responsible for projecting red and blue light on the screen (the combination of red and blue light makes purple light), and a micromirror that projects orange pixels is only responsible for reflecting red and green light proportionally on the screen (red and blue light). The proportion of light is higher, and the proportion of green light is lower). Due to the fast opening and closing speed of the mirror surface of the micromirror, the light is projected to the screen through the lens assembly, and the human visual organ mixes the three-color light that flashes rapidly. Image.
  • the light valve 2 may have a resolution of 2K, or a resolution of 3K or higher, which is not limited in this embodiment of the present application.
  • the total reflection (English name: total internal reflection; abbreviation: TIR) prism 4 is located between the galvanometer 5 and the light valve 3 .
  • the total reflection prism 4 is used to convert the light beam emitted by the light valve 2 into a parallel light beam, so as to improve the final image smoothness on the screen 7 .
  • the laser in the laser light source device 1 emits a light beam, and then the light path is turned through the reflector 2, and the turned light beam enters the total reflection prism 4, which can guide the light beam to the light valve 3, and the light valve 3 After receiving the light beam, it modulates it and forms an image light beam. This part of the light beam enters the total reflection prism 4 again, and then forms parallel light through the total reflection prism 4.
  • the lens assembly 6 is then imaged on the screen 7.
  • the reflector 2 is used to turn the path of the laser beam emitted by the laser light source device 1 .
  • the reflector 2 can be placed at 45 degrees to the direction of the laser light.
  • Such a structure makes the laser light source device 1
  • the light path of the outgoing laser light is turned by 90 degrees, which can shorten the length of the light path in the direction in which the laser light is emitted, and further reduce the volume of the projection device.
  • the total reflection prism 6 may be a prism with a right triangle in cross section, or may be a prism with a right triangle in cross section and a compensation prism glued together, which is not limited in this embodiment of the present application.
  • the total reflection prism when the total reflection prism is used for illumination, the total reflection function is realized in the illumination light path, and the light incident on the prism can be totally reflected to the light valve; when the total reflection prism is used in the ultra-short focal lens system, The total reflection prism can be used as a flat glass, which can well control the impact of dust on the imaging quality of the system.
  • the galvanometer 3 may include an optical lens and a driving component, the driving component drives the optical lens to swing continuously with a preset rotation axis, and the optical lens can change the direction of the light beam accordingly, wherein the optical lens may be a flat glass or a reflecting mirror.
  • the light beam incident on the galvanometer is a parallel light beam (that is, the incident angle of each light in the light beam is the same)
  • the corresponding image beam The displacement distance of each pixel of the projected image is equal, so that the offset from each field of view in the projection lens to the projection screen is the same, which can ensure the high-resolution display of the visual image.
  • the offset of the field of view refers to the actual displacement distance of the field of view, so the beam emitted from the galvanometer is parallel light, and the 2k or 3k resolution can be converted to 4k resolution through the high-frequency vibration of the galvanometer.
  • Such a structure can reduce the difficulty of system design.
  • the 2K resolution light valve can also achieve 4K resolution when used in conjunction with the galvanometer.
  • the 4k resolution light valve and the galvanometer can also achieve 8k resolution. While improving the resolution, it can also take into account the size of the whole machine.
  • the flatness of the galvanometer is less than 3 stripes, and the irregularity is less than 1/2 stripes.
  • Flatness refers to the deviation of the macro-concave-convex height of the substrate from the ideal plane. Compare the actual surface to be measured with the ideal plane, and the line value distance between the two is the flatness error value; or measure the relative height difference of several points on the actual surface, and then convert the flatness error value represented by the line value. .
  • the flatness of the mirror used in this application is less than 3 stripes, and the irregularity is less than 1/2 stripe.
  • the specific flatness is not limited in this embodiment of the present application.
  • an embodiment of the present application provides a projection device, which includes a light valve, a galvanometer, a lens assembly, a screen, and the laser light source device provided in Embodiment 1.
  • the laser light source device includes a laser array, a light conduction component and a fly-eye lens.
  • the sine value of the divergence angle of the fast axis of the laser is greater than the sine value of the aperture angle of the long side of the rectangular lens, and the sine value of the divergence angle of the slow axis is greater than the short axis of the rectangular lens.
  • the sine of the aperture angle of the side the parameters of the laser are correlated with the parameters of the fly-eye lens, so that the function of uniform light can be realized by the fly-eye lens.
  • the size will also be smaller, which further reduces the volume of the projection device, making the appearance thin and beautiful.
  • the problem that the volume of the laser light source device is too large in the related art is solved, and the effect of reducing the volume of the laser light source device is achieved

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Abstract

一种激光光源装置(1)和投影设备，属于激光显示领域。激光光源装置(1)包括：激光器阵列(11)、光传导组件(12)以及复眼透镜(13)，复眼透镜(13)包括阵列排布的多个矩形透镜(131)，激光器(111)的快轴方向(f1)与复眼透镜(13)中的矩形透镜(131)的短边(b)平行，激光器(111)的慢轴方向(f2)与复眼透镜(13)中的矩形透镜(131)的长边(a)平行，且激光器(111)的快轴的发散角度(α 1)的正弦值(sinα 1)大于矩形透镜(131)的长边(a)的孔径角(β 1)的正弦值(sinβ 1)，激光器(111)的慢轴的发散角度(α 2)的正弦值(sinα 2)大于矩形透镜(131)的短边(b)的孔径角(β 2)的正弦值(sinβ 2)。

Description

激光光源装置和投影设备
相关申请的交叉引用
本申请要求在2020年12月29日提交中国专利局、申请号为202011597569.2，发明名称为“激光光源装置和投影设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及激光显示领域，特别涉及一种激光光源装置和投影设备。
背景技术
随着人们对画面色彩的不断追求，具有成像画面大、光谱亮度高及展现色域广等优点的激光投影得以发展。其中，三色半导体激光器作为激光光源开始应用于激光投影技术中。
发明内容
本申请实施例第一方面提供了一种激光光源装置，所述装置包括沿光路方向依次设置的激光器阵列、光传导组件以及复眼透镜，所述复眼透镜包括阵列排布的多个矩形透镜；
所述激光器阵列包括阵列排布的多个激光器，所述激光器的快轴方向与所述复眼透镜中的矩形透镜的短边平行，所述激光器的慢轴方向与所述复眼透镜中的矩形透镜的长边平行，且所述激光器的快轴的发散角度的正弦值大于所述矩形透镜的长边的孔径角的正弦值，所述激光器的慢轴的发散角度的正弦值大于所述矩形透镜的短边的孔径角的正弦值。
本申请实施例的第二方面，提供了一种投影设备，投影设备包括：上述的激光光源装置。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例提供的一种激光光源装置的结构示意图；
图2是图1所示激光光源装置的激光器阵列的结构示意图；
图3是图1所示激光光源装置的复眼透镜的结构示意图；
图4是本申请实施例提供的激光光源装置的光路图；
图5是图1所示激光光源装置中一种缩束系统的结构示意图；
图6是图1所示激光光源装置中一种复眼透镜的结构示意图；
图7是本申请实施例示出的一种投影设备的结构示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
除非上下文另有要求，否则，在整个说明书和权利要求书中，术语“包括”被解释为开放、包含的意思，即为“包含，但不限于”。在说明书的描述中，术语“一个实施例、“一些实施例”、“示例性实施例”、“示例”、“特定示例”或“一些示例”等旨在表明与该实施例或示例相关的特定特征、结构、材料或特性包括在本公开的至少一个实施例或示例中。上述术语的示意性表示不一定是指同一实施例或示例。此外，所述的特定特征、结构、材料或特点可以以任何适当方式包括在任何一个或多个实施例或示例中。
以下，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。在本公开实施例的描述中，除非另有说明，“多个”的含义是两个或两个以上。
图1是本申请实施例提供的一种激光光源装置的结构示意图，如图1所示，该激光光源装置1包括沿光路方向依次设置的激光器阵列11、光传导组件12以及复眼透镜13，复眼透镜13包括阵列排布的多个矩形透镜。激光器阵列11出射光束，光传导组件12用于接收激光器阵列11出射的光束并将其导向复眼透镜13。
激光器阵列11包括阵列排布的多个激光器，激光器的快轴方向与复眼透镜13中的矩形透镜的短边平行，激光器的慢轴方向与复眼透镜中13的矩形透镜的长边平行，且激光器的快轴的发散角度的正弦值sinα 1大于矩形透镜的长边的孔径角β 1的正弦值sinβ 1，即sinα 1＞sinβ 1；激光器的慢轴的发散角度α 2的正弦值sinα 2大于矩形透镜的短边的孔径角β 2的正弦值sinβ 2，即sinα 2＞sinβ 2。
其中，激光器中传播速度慢的光矢量方向称之为激光器的慢轴，激光器 中传播速度快的光矢量方向称之为激光器的快轴。图2是图1所示激光光源装置的激光器阵列的结构示意图，如图2所示，本申请实施例中所提供的激光光源装置的激光器阵列中的激光器的快轴方向为f1，慢轴方向为f2。
此外，激光器的发散角度用来衡量光束从束腰(束腰指光束传播方向上光束半径最小的位置，此位置的光束半径称为束腰半径)向外发散的速度。可通过测量光束散焦度来测量激光器的发散角度，即采用光束分析仪测量不同位置的光束半径，进而得到激光器的发散角度。
图3是图1所示激光光源装置的复眼透镜的结构示意图，如图3所示，复眼透镜13包括阵列排布的多个矩形透镜131。
复眼透镜通过每个矩形透镜将光束分割为N(N的数值为复眼透镜中矩形透镜的个数)个通道，每个通道的光束独立照明整个物面，即物面的照明是每个通道照明的叠加，因此大大提高了被照明物面的均匀性。
在复眼透镜的应用中，将两列复眼透镜阵列平行排列，第一列复眼透镜阵列中的各个矩形透镜的焦点与第二列的复眼透镜阵列中对应的矩形透镜的中心重合，两列复眼透镜的光轴互相平行，即可对输入的激光光束的光斑分割，再通过后续聚焦透镜将分割的光斑累加，从而实现对光束的匀化以及光斑优化。
另外，作为匀光器件的复眼透镜的体积较小，如此可对应减少该激光光源装置的体积，进一步减少使用该激光光源装置的投影设备的体积，使得投影设备整体较为轻薄与美观，用户体验较好。
综上所述，本申请实施例提供一种激光光源装置，该激光光源装置包括激光器阵列、光传导组件以及复眼透镜，激光器阵列包括多个阵列排布的激光器，复眼透镜包括多个矩形透镜，激光器的快轴的发散角度的正弦值大于矩形透镜的长边的孔径角的正弦值，慢轴的发散角度的正弦值大于矩形透镜的短边的孔径角的正弦值。如此将激光器的参数与复眼透镜的参数进行了关联，便于通过复眼透镜来实现匀光的功能，且相较于光导管，由于复眼透镜在光路方向上的尺寸较小，因而该激光光源装置的尺寸也会较小。解决了相关技术中激光光源装置的体积过大的问题，达到了减小激光光源装置的体积的效果。
在一种具体实施中，请参考图2及图3，激光器阵列11包括多个激光器111，复眼透镜13包括阵列排布的多个矩形透镜131，激光器111的光斑面积大于矩形透镜131的面积。如图3所示，复眼透镜13中的矩形透镜131均匀 排列，且每个矩形透镜131均具有长边a以及短边b，因此，矩形透镜131的面积S 1＝a·b；同时，在本申请实施例中，激光器111的光斑面积S 2大于矩形透镜131的面积S 1，即S 2＞S 1。如此结构，激光器的光斑经过多个复眼透镜中的矩形透镜，使得光斑尽可能的被多次被分割，以达到对激光光束的匀光要求。
在一种具体实施中，激光器的光斑面积S 2大于三倍的矩形透镜的面积S 1,即S 2＞3S 1。如此结构，激光器的光斑可至少经过多个矩形透镜，使得激光芯器的光斑被复眼透镜中的矩形透镜分割成多个部分，再通过后续聚焦透镜将分割后的光斑叠加，从而实现对光束的匀化。
在一种具体实施中，激光器的快轴的发散角度的正弦值sinα 1大于激光器的慢轴的发散角度的正弦值sinα 2。其中，阵列式激光器输出光束的快轴的发散角度的范围可以为40度至90度，慢轴的发散角度可以为10度。
此外，请参考图2，激光器阵列11包括用于发出三种颜色激光的激光器111，分别为用于发出红色激光的红光激光器111a，用于发出蓝色激光的蓝色激光器111b以及用于发出绿色激光的绿色激光器111c。红色激光器111a发出的红色激光，波长可以为638纳米至650纳米。蓝色激光器111b的激光波长范围可以为445纳米至450纳米，绿色激光器111c的激光波长范围可以为532纳米至556纳米。激光的波长指激光器的输出激光的波长。
示例性的，如图2所示，激光器111包括两组红色激光器111a，一组蓝色激光器111b以及一组绿色激光器111c。在一种实施例中，激光器内的激光器的排列方式为一行设置七个激光器，共设置四行，第一行设置为绿色激光器111c，第二行设置为蓝色激光器111b，第三行及第四行设置为红色激光器111a。
同时，激光器111的快轴方向f1与该激光器111的列方向平行，慢轴方向f2与该激光器111的行方向平行。
此外，红色激光器111a、蓝色激光器111b以及绿色激光器111c所发出的红色激光、蓝色激光以及绿色激光称为三原色光，英文表示分别为R(Red)、B(Blue)以及G(Green)。自然界中各种颜色都可以通过改变三原色光的频率和强度，进而组合得到。此外，红色激光、蓝色激光以及绿色激光等比例混合后可形成白光。
在一种具体实施中，矩形透镜的长边的孔径角β 1的正弦值sinβ 1大于矩形透镜的短边的孔径角β 2的正弦值sinβ 2。
在一种具体实施中，请参考图4，图4是本申请实施例提供的激光光源装 置的光路图，光传导组件12包括阶梯镜121，阶梯镜121包括反射镜1211以及二向色片1212。反射镜1211位于绿色激光器111c与复眼透镜13之间，反射镜1211用于转折光路并将绿色激光器111c发出的绿色激光导向二向色片1212。
在本申请实施例中，二向色片1212包括第一二向色片1212a以及第二二向色片1212b，如图4所示，第一二向色片1212a位于蓝色激光器111b与复眼透镜13之间，第二二向色片1212b位于两组红色激光器111a与复眼透镜13之间。
其中，二向色片又称合光镜，是一种彩色滤光器，可用来选择性的透过某一颜色光并对其他色光进行反射，二向色片对穿透光的穿透率高(穿透率高达97％)且对反射光的反射效率高(反射效率大于99％)，同时具有吸收小、散色少、激光损耗少以及无膜面之分等优点。
第一二向色片1212a用于反射蓝色激光器111b发出的蓝色激光并透射绿色激光器111c发出的绿色激光；第二二向色片1212b用于反射红色激光器111a发出的红色激光并透射第一二向色片1212a射出的蓝色激光以及绿色激光。
此外，如图4所示，经第一二向色片1212a反射出的蓝色激光以及透射出的绿色激光共向，且该方向y与激光器111出射方向x垂直。同理，经第二二向色片1212b反射出的红色激光以及透射出的绿色激光及蓝色激光共向，该方向y与激光器111出射方向x垂直。如此结构，使得激光器发出的红色激光、蓝色激光以及绿色激光经光传导组件12进行合光，同时，光传导组件12也对激光光路的进行了转折，缩短了激光光路在平行于激光器111出射方向上的距离，使得该激光光源装置中各部件排列较为紧凑，空间利用率较高，如此可减少该激光光源装置的体积并减轻系统重量，以满足激光光源装置小型化的要求。
在一种具体实施中，如图4所示，光传导组件12中的反射镜1211可45度放置。即绿色激光器111c发出的绿色激光射入反射镜1211时入射角为45度。
在一种具体实施中，本申请实施例示出的激光光源装置中的二向色片1212可以为45度二向色片，即二向色片与激光器111出射方向x呈45度角放置。
在一种具体实施中，请参考图1，激光光源装置1还包括准直镜14，准直镜14位于激光器阵列11与光传导组件12之间。激光器阵列11出射三色光束，该三色光束入射准直镜14。准直镜14用于准直光路中的激光光束并形 成平行的出射激光，由于激光自身特性，激光器阵列11发射的激光光束可能强度分布不均匀，例如出现亮点或各种形状的条纹，可通过准直镜14的平行出射作用，形成平行的激光光束，进而通过光传导组件12进行光路的转折以及三色激光的合光，如此结构，降低了激光光束的空间相干性并抑制了激光散斑。
在一种具体实施中，激光光源装置1还包括扩散组件15，扩散组件15位于光传导组件12与复眼透镜13之间，扩散组件15包括扩散轮或扩散片。由于光源为纯三色激光光源，激光会出现散斑现象(散斑现象指被激光照明的物体，其表面呈现颗粒状结构)。激光具有高度相干性，因此，激光从物体表面反射时，物体上各个点到观察点的振动是相干的，观察点的光场是粗糙表面上各点发出的相干子波的叠加，又因粗糙表面的粗糙度大于激光波长，物体各点发出的子激光到达观察点的相位处于随机分布的状态，相干叠加就产生了散斑图样，且散斑图样的强度随机分布。在本申请实施例中，扩散组件15可以为扩散轮或扩散片，用于对三色激光进行匀光处理，以减少激光光斑能量分布不均匀。
扩散轮在工作时，沿其轴线以一定频次进行转动，转动的扩散轮可对激光光束在空间上产生一些随机相位，如此即可对激光的相干性造成干扰。从而减少激光光斑分布不均的现象。
在一种具体实施中，激光光源装置1还包括缩束系统16，缩束系统16位于光传导系统12与复眼透镜13之间。如果激光器111射出的激光的光斑尺寸过大，则可以对激光器111射出的激光进行缩束处理，从而提高扩散效率。图5是图1示出的激光光源装置中一种缩束系统的结构示意图，如图5所示，缩束系统16包括一组透镜组结构161，透镜组结构161包括一个凹透镜1611及一个凸透镜1612，凹透镜1611的光轴与凸透镜1612的光轴重合。其中，凸透镜1612用于接收入射方向与该凸透镜1612光轴平行的入射光束，对入射光束进行汇聚并将其反射到凹透镜1611；凹透镜1611将接收到的光束发散并沿着与该凹透镜1611平行的方向出射光束。如此结构，通过凸透镜将口径较大的光束进行汇聚并向凹透镜出射，凹透镜将光束进行发散，以形成口径较小的出射光束，即可达到对光束的缩束效果。
在一种具体实施中，激光光源装置1还包括扩散组件15及缩束系统16。在一种实现方式中，激光光源装置可同时包括扩散组件15以及缩束系统16，其中，缩束系统16位于扩散组件15与光传导组件12之间。
在一种具体实施中，请参考图4，激光光源装置1还包括半波片17。半 波片17位于两组红色激光器111a与第二二向色片1212b之间，且该半波片17的平面与红色激光器111a出射光束的方向垂直。半波片能够改变激光偏振光的偏振方向，从而提高投影光学系统及投影屏幕对三色激光的光处理一致性，进一步解决三色激光投影画面中的色斑”或“色块”等偏色问题。
图6是图1所示激光光源装置中一种复眼透镜的结构示意图，如图4及图6所示，复眼透镜13包括平行排列的第一复眼透镜131以及第二复眼透镜132，第一复眼透镜131用于接收光传导组件12射出的光束，第二复眼透镜132用于将匀化后的光束射出。其中，第一复眼透镜131以及第二复眼透镜132上的矩形透镜数量相等，且一一对应。
如图6所示，光束沿y方向垂直进入第一复眼透镜131后形成一束与光轴平行的平行光，光束经过第一复眼透镜131后聚焦到第二复眼透镜132的中心处，即第一复眼透镜131将光源形成多个光源像进行照明，第二复眼透镜132的每个矩形透镜将第一复眼透镜131上对应的矩形透镜重叠成像，经后续聚光镜将第二复眼透镜132出射的光斑聚焦在显示屏上。如此结构，第一排复眼透镜131将光源的整个宽光束分为多个细光束，由于处于对称位置细光束的相互叠加，使得每个细光束范围内的微小不均匀性获得补偿，从而使整个孔径内的光能量得到有效均匀的利用，实现对光束的匀化。
在一种具体实施中，第一复眼透镜可以通过基板与第二复眼透镜一体制成。其中，基板材料可以为玻璃材料或其他透光材料。第一复眼透镜位于基板的一面，第二复眼透镜位于基板的另一面，如此结构，不仅便于安装，且可以节省复眼透镜所占空间，进一步缩减了该激光光源装置的体积，使其造型更为美观。
综上所述，本申请实施例提供一种激光光源装置，该激光光源装置包括激光器阵列、光传导组件以及复眼透镜，激光器阵列包括多个阵列排布的激光器，复眼透镜包括多个矩形透镜，激光器的快轴的发散角度的正弦值大于矩形透镜的长边的孔径角的正弦值，慢轴的发散角度的正弦值大于矩形透镜的短边的孔径角的正弦值。如此将激光器的参数与复眼透镜的参数进行了关联，便于通过复眼透镜来实现匀光的功能，且相较于光导管，由于复眼透镜在光路方向上的尺寸较小，因而该激光光源装置的尺寸也会较小。解决了相关技术中激光光源装置的体积过大的问题，达到了减小激光光源装置的体积的效果。
此外，本申请实施例还提供一种投影设备，请参考图7，图7是本申请实 施例示出的一种投影设备的结构示意图，该投影设备包括反射镜2、光阀3、全反射棱镜4、振镜5、镜头组件6、荧幕7以及上述实施例中提供的激光光源装置1。
其中，激光光源装置1、反射镜2、光阀3、全反射棱镜4、振镜5以及镜头组件6沿光路方向依次设置。激光光源装置1用于提供照明光束，反射镜2用于对激光光源装置1提供的光束进行转折，全反射棱镜4用于接收反射镜2导出的光束，并将其导向光阀3，光阀3用于接收光束并将对其进行调制后形成影像光束，然后配合振镜5以及全反射棱镜4将光束导向镜头组件6，镜头组件6用于接收影像光束并对影像光束校正放大后投射至荧幕7。振镜5位于全反射棱镜4与镜头组件6之间，全反射棱镜4用于将光阀3调制成形后的影像光束射向振镜5，振镜5以预设频率振动，使得通过该振镜5的光束错位叠加并进入镜头组件6。
其中，光阀(英文：digital micromirror device，简称DMD)是一种数字微镜元件，可以对光进行数字化调制。同时，光阀包括多个高速数字式光反射微镜组成的阵列，这个阵列对应于投影图像中的光线，当这些微镜和数字信号、光源以及投影镜头协同工作时，可以把图像真实的还原出来。
通过数字信号激活各个微镜下的微型电极，微型电极会推动微镜的镜面迎向或避开光源，当微镜的镜面迎向光源时(即微镜处于开启状态)，会将一个白色像素点通过镜头组件反射至投影设备中的荧幕，当微镜的镜面避开光源时(即微镜处于关闭状态)，微镜像素在荧幕上的位置便呈现深色。因此，光阀中的多个小型反射镜一一对应一个像素，反射镜的数量便决定了光阀的显示分辨率。示例性的，4K分辨率的光阀，其微镜阵列排布可以为4096*2160。
同时，微镜镜面的开合速度可以为5000次/秒(即光阀中的微镜镜面可以在一秒钟旋转数千次)，因此，交换各个微镜的开合时间，可以产生不同等级的灰度。例如：微镜开启的时间大于关闭的时间，产生的灰度像素就越浅；微镜关闭的时间大于开启的时间，产生的灰度像素则越深。
此外，在光阀的工作过程中，微镜通过转动来反射光线，每个微镜的转动均由位于每个微镜下的微型电极控制。同时，每个微镜在一次旋转过程中只反射一种颜色。例如，投射紫色像素的微镜只负责在荧幕上投射红蓝光(红色光与蓝色光组合为紫色光)，投射橘色像素的微镜只负责在荧幕上按比例反射红绿光(红色光所占比例较高，绿色光所占比例较低)。因微镜镜面的开合速度较快，光线通过镜头组件投射至荧幕，人类的视觉器官将快速闪动的三色光混在一起，又因存在视觉暂留现象，可在荧幕上看到清晰的图像。
其中，光阀2可以是2K分辨率，也可以是3K分辨率或者更高的分辨率，本申请实施例对此不进行限制。
全反射(英文名称：total internal reflection；缩写：TIR)棱镜4位于振镜5与光阀3之间。全反射棱镜4用于将光阀2射出的光束变为平行光束，以提高最终在荧幕7上的成像的光滑度。如图7所示，激光光源装置1中的激光器出射光束，进而通过反射镜2进行光路的转折，转折后的光束进入全反射棱镜4，全反射棱镜4可将光束导向光阀3，光阀3接收到光束后对其进行调制并形成影像光束，这部分光束再次进入全反射棱镜4中，进而通过全反射棱镜4形成平行光，平行光入射至振镜5，再通过振镜5射出至镜头组件6，然后成像于荧幕7。
其中，反射镜2用于对激光光源装置1出射的激光光束的路径进行转折，在一种具体实施中，反射镜2可与激光射出的方向呈45度放置，如此结构，使得激光光源装置1出射的激光的光路被转折90度，可缩短光路在激光射出方向上的长度，进一步减少该投影设备的体积。
其中，全反射棱镜6可以为横截面是直角三角形的棱镜，也可以为横截面是直角三角形的棱镜与补偿棱镜胶合而成，本申请实施例对此不进行限制。
同时，当全反射棱镜用于照明时，在照明光路中实现的是全反射功能，可以将入射到棱镜上的光全反射至光阀上；当全反射棱镜用于超短焦镜头系统时，全反射棱镜可以作为平板玻璃，很好的控制灰尘对系统成像质量的影响。
此外，振镜3可以包括光学镜片以及驱动部件，驱动部件驱动光学镜片以预设的转动轴不断摆动，光学镜片可以随之改变光束的方向，其中，光学镜片可以为平板玻璃或反射镜。
示例性的，当入射至振镜上的光束为平行光束(即光束中的每条光线的入射角相同)时，振镜中的光学镜片从一个位置摆动至另一个位置后，影像光束对应的投影图像的每个像素的移位距离均相等，使得投影镜头中各视场到投影屏幕的偏移量一致，这样可以保证目视画面的高分辨率显示。其中，视场的偏移量指的是视场的实际移位距离，所以从振镜出射的光束为平行光，可以通过振镜的高频振动实现2k或3k分辨率转换为4k分辨率，如此结构，可降低系统设计难度。
应用了振镜之后，2K分辨率的光阀与振镜配合使用也可以达到4K分辨率。4k分辨率的光阀与振镜配合使用也可以达到8k分辨率，在提升分辨率的同时，也可兼顾整机尺寸。
在一种具体实施中，振镜的平面度小于3个条纹，不规则度小于1/2个条纹。平面度是指基片具有的宏观凹凸高度相对理想平面的偏差。将被测实际表面与理想平面进行比较，两者之间的线值距离即为平面度误差值；或通过测量实际表面上若干点的相对高度差，再换算以线值表示的平面度误差值。平面度误差的测量方法可以参考相关技术，本申请实施例在此不做限定。本申请所使用的反射镜的平面度小于3个条纹，不规则度小于1/2个条纹。具体的平面度本申请实施例在此不做限定。
综上所述，本申请实施例提供一种投影设备，该投影设备包括光阀、振镜、镜头组件、荧幕以及实施例1中提供的激光光源装置。激光光源装置包括激光器阵列、光传导组件以及复眼透镜，激光器的快轴的发散角度的正弦值大于矩形透镜的长边的孔径角的正弦值，慢轴的发散角度的正弦值大于矩形透镜的短边的孔径角的正弦值。如此将激光器的参数与复眼透镜的参数进行了关联，便于通过复眼透镜来实现匀光的功能，且相较于光导管，由于复眼透镜在光路方向上的尺寸较小，因而该激光光源装置的尺寸也会较小，也进一步减少了该投影设备的体积，使之外形轻薄美观。解决了相关技术中激光光源装置的体积过大的问题，达到了减小激光光源装置的体积的效果。
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种激光光源装置，包括：
    沿光路方向依次设置的激光器阵列；
    光传导组件；
    复眼透镜，所述复眼透镜包括阵列排布的多个矩形透镜；
    其中，所述激光器阵列包括阵列排布的多个激光器，所述激光器的快轴方向与所述复眼透镜中的矩形透镜的短边平行，所述激光器的慢轴方向与所述复眼透镜中的矩形透镜的长边平行，且所述激光器的快轴的发散角度的正弦值大于所述矩形透镜的长边的孔径角的正弦值，所述激光器的慢轴的发散角度的正弦值大于所述矩形透镜的短边的孔径角的正弦值。
  2. 根据权利要求1所述的激光光源装置，所述激光器阵列包括多个激光器，所述复眼透镜包括阵列排布的多个所述矩形透镜，所述激光器的光斑面积大于所述矩形透镜的面积。
  3. 根据权利要求2所述的激光光源装置，所述激光器的光斑面积大于三倍的所述矩形透镜的面积。
  4. 根据权利要求2所述的激光光源装置，所述激光器的快轴的发散角度的正弦值大于所述激光器的慢轴的发散角度的正弦值。
  5. 根据权利要求3所述的激光光源装置，所述光传导组件包括阶梯镜，所述阶梯镜包括反射镜以及二向色片。
  6. 根据权利要求5所述的激光光源装置，所述激光光源装置还包括准直镜，所述准直镜位于所述激光器阵列与所述光传导组件之间。
  7. 根据权利要求6所述的激光光源装置，所述激光光源装置还包括扩散组件，所述扩散组件位于所述光传导组件与所述复眼透镜之间，所述扩散组件包括扩散轮或扩散片。
  8. 根据权利要求7所述的激光光源装置，所述激光光源装置还包括缩束系统，所述缩束系统位于所述光传导系统与所述复眼透镜之间。
  9. 根据权利要求7所述的激光光源装置，所述激光光源装置还包括所述扩散组件及缩束系统。
  10. 一种投影设备，所述投影设备包括权利要求1-9任一所述的激光光源装置。
PCT/CN2021/103532 2020-12-29 2021-06-30 激光光源装置和投影设备 WO2022142218A1 (zh)

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CN105511087A (zh) * 2016-01-13 2016-04-20 晋煤激光科技股份有限公司 基于复眼透镜的激光显示匀场整形装置
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CN101855902A (zh) * 2007-09-25 2010-10-06 以克斯普雷有限公司 微投影仪
US20120080411A1 (en) * 2010-09-30 2012-04-05 Panasonic Corporation Laser illumination system with reduced speckle
CN103797564A (zh) * 2011-11-04 2014-05-14 应用材料公司 使用微透镜阵列而产生线路的光学设计
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