WO2015032173A1 - 一种低投射比高光效立体投影装置及立体投影*** - Google Patents
一种低投射比高光效立体投影装置及立体投影*** Download PDFInfo
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- WO2015032173A1 WO2015032173A1 PCT/CN2014/070688 CN2014070688W WO2015032173A1 WO 2015032173 A1 WO2015032173 A1 WO 2015032173A1 CN 2014070688 W CN2014070688 W CN 2014070688W WO 2015032173 A1 WO2015032173 A1 WO 2015032173A1
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- reflected
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- light beam
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
- H04N13/337—Displays for viewing with the aid of special glasses or head-mounted displays [HMD] using polarisation multiplexing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/363—Image reproducers using image projection screens
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/388—Volumetric displays, i.e. systems where the image is built up from picture elements distributed through a volume
- H04N13/39—Volumetric displays, i.e. systems where the image is built up from picture elements distributed through a volume the picture elements emitting light at places where a pair of light beams intersect in a transparent material
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- 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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
- G02B27/285—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining comprising arrays of elements, e.g. microprisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
Definitions
- the invention belongs to the technical field of stereoscopic projection, and in particular relates to a low projection ratio high light effect stereoscopic projection device and a stereoscopic projection system.
- Patent No. 201220746320.8 patented as "high-efficiency light modulation device and high-efficiency stereoscopic projection system" invention patent published technology, the need to use a larger size of the polarization device, the incident light is divided into transmitted light and reflected light Beam, then adjust the polarization of the light so that the two beams coincide on the metal screen.
- the optical path size is large, and the required optical components are also large.
- the size of each device becomes large, and the coincidence of the two beams becomes very difficult.
- there are many difficulties in the processing and assembly of the device and there are also great difficulties in mass production.
- the technical problem to be solved by the present invention is to provide a low projection ratio high-efficiency stereoscopic projection device and a stereoscopic projection system, aiming at solving the problem of large volume of the existing projection device.
- a low projection ratio high light efficiency stereoscopic projection apparatus includes:
- a polarization beam splitting component that splits a projection beam from the projector into a transmitted beam, a first reflected beam, and a second reflected beam; a polarization direction of the transmitted beam and a polarization direction of the first reflected beam and the second reflected beam are positive cross;
- a polarization conversion component that adjusts a polarization state of the transmitted beam or a polarization state of the first reflected beam and the second reflected beam, and the transmitted beam, the first reflected beam, and the second reflected beam have the same polarization state after adjustment ;
- the optical path direction adjusting component adjusts a propagation direction of the transmitted beam or a propagation direction of the first reflected beam and the second reflected beam, and the transmitted beam, the first reflected beam, and the second reflected beam have the same propagation direction after adjustment ;
- a beam size adjustment component adjusting a size range of the transmitted beam or a size range of the first reflected beam and the second reflected beam, and adjusting a projected image size of the transmitted beam, the first reflected beam, and the second reflected beam Consistent
- the light modulator modulates the adjusted transmitted light beam, the first reflected light beam, and the second reflected light beam into left-handed circularly polarized light and right-handed circularly polarized light in a frame order.
- the polarization beam splitting component is a polarizing beam splitting prism group;
- the polarizing beam splitting prism group is formed by three 45 degree prism coatings and laminations, and has a rectangular parallelepiped shape, has one incident surface, three emitting surfaces, and has two internal points.
- the plane of polarization, the two polarization planes are perpendicular to each other, and are respectively 45 degrees with the incident surface, and the two polarization planes intersect at a center line of the incident surface.
- the polarization conversion component is at least one twisted liquid crystal device; the twisted liquid crystal device is placed in an optical path where the first reflected light beam and the second reflected light beam are located and is located before or in the optical path direction adjusting component After the optical path direction adjustment component, or placed at any position between the beam size adjustment component and the front of the light modulator.
- the twisted liquid crystal device is a liquid crystal device based on a glass substrate, a liquid crystal device based on a flexible plastic substrate, or a polymer liquid crystal film based on a polymer technology.
- the optical path direction adjusting component is a two mirror; the two mirrors are disposed in an optical path of the first reflected beam and the second reflected beam.
- the beam size adjusting component is at least one lens or lens group, and the lens or lens group is placed at any one of the optical paths where the transmitted beam, the first reflected beam and the second reflected beam are located.
- the light modulator is a liquid crystal light valve type light modulator.
- the low-projection ratio high-efficiency stereoscopic projection device further includes a linear polarizer positioned in front of the light modulator to filter polarization states of the transmitted beam, the first reflected beam, and the second reflected beam. Consistent.
- the light modulator is replaced with a quarter-wave retardation film, and the transmitted beam, the first reflected beam, and the second reflected beam are converted into left-handed circularly polarized light having an angle of 45 degrees and an angle of 135 degrees.
- Right-handed circularly polarized light is replaced with a quarter-wave retardation film, and the transmitted beam, the first reflected beam, and the second reflected beam are converted into left-handed circularly polarized light having an angle of 45 degrees and an angle of 135 degrees.
- the present invention also provides a low projection ratio high light efficiency stereoscopic projection system, comprising a projector, a metal screen and any low projection ratio high luminous efficiency stereoscopic projection device as described above; the projector sequentially playing the left eye image in frame order And a right eye image; the metal screen is used to image the reflected beam and the transmitted beam, and the pair of rays are reflected in opposite circular polarization states.
- the low projection ratio high-efficiency stereoscopic projection device of the invention adopts a polarization beam splitting component to divide the incident beam into three parts and respectively passes through two polarization beam splitting surfaces, thereby effectively reducing the optical path difference between the reflected beam and the transmitted beam, thereby making the whole device The volume is greatly reduced, and the overlapping of the beams becomes simpler.
- a twisted liquid crystal device is used as a rotating device of polarized light polarization direction, which has the advantages of small dispersion and high polarization rotation efficiency.
- FIG. 1 is a schematic view showing the outer shape and optical path of a conventional polarizing beam splitting prism of the prior art
- FIG. 2 is a schematic diagram of a polarization beam splitting prism group and an optical path thereof according to an embodiment of the present invention
- FIG. 3 is an optical structural diagram of a first low-projection ratio high-efficiency stereoscopic projection device provided by the present invention, the twisted liquid crystal device is located in two reflected light paths, and is located between the polarization beam splitting device and the mirror;
- FIG. 4 is an optical structural diagram of a second low-projection ratio high-efficiency stereoscopic projection device provided by the present invention, wherein the twisted liquid crystal device is located in the transmitted light path;
- FIG. 5 is an optical structural diagram of a third low-projection high-efficiency stereoscopic projection device provided by the present invention.
- the twisted liquid crystal device is located in two reflected light paths and is located between the mirror and the linear polarizer.
- the low projection ratio high-efficiency stereoscopic projection device of the present invention uses a polarization beam splitting prism group to divide an incident beam into three beams of different polarization states, and then uses a twisted liquid crystal device to adjust the polarization state of one or two beams.
- a polarization beam splitting prism group to divide an incident beam into three beams of different polarization states, and then uses a twisted liquid crystal device to adjust the polarization state of one or two beams.
- this design can convert about 70% of the light of the projector into polarized light, thereby improving the light utilization efficiency of the stereoscopic projection device to increase the brightness of the projected image, and having the characteristics of small structure and small projection ratio.
- the projector is around 1:1.
- the conventional polarizing beam splitting prism as shown in FIG. 1 is glued together using two 45-degree prisms, and has one polarization plane. After the light is incident, it is divided into a transmissive P-state polarized light 101 and a reflected S-state polarized light. 102.
- the polarizing beam splitting prism is redesigned according to the existing deficiency of the conventional polarizing beam splitting prism.
- the polarizing beam splitting prism group used in the present invention is formed by laminating three 45 degree prisms after being coated. It has a rectangular parallelepiped shape, has one incident surface, three exit surfaces, and has two polarization planes inside.
- the two polarization planes are perpendicular to each other, and are 45 degrees with the incident surface.
- the two polarization planes are at the center of the incident surface. Lines intersect. After the light is incident, it is divided into transmissive P-state polarized light 201 and reflected S-state polarized light 202 and 203.
- the low-projection high-efficiency stereoscopic projection apparatus of the present invention comprises: a polarization beam splitting component 302, optical path direction adjusting components 305 and 306, polarization state converting components 303 and 304, a beam size adjusting component 307, and a light modulator 309. .
- the polarization beam splitting component 302 is configured to divide an incident light beam emitted from a lens of the projector 301 into a transmitted light beam 201, a first reflected light beam 202, and a second reflected light beam 203.
- the transmitted light beam has a polarization state of P state, and two reflected light beams.
- the polarization state is the S state, and the transmitted beam and the reflected beam are collectively referred to as polarized light.
- the polarization beam splitting component 302 splits the projection beam from the projector 301 into a transmitted beam 201, a first reflected beam 202, and a second reflected beam 203.
- the polarization direction of the transmitted beam 201 is opposite to the first reflected beam 202,
- the polarization directions of the second reflected light beams 203 are orthogonal.
- the polarization state conversion components 303 and 304 adjust a polarization state of the transmitted light beam or a polarization state of the first reflected light beam and the second reflected light beam, and the adjusted transmitted light beam, the first reflected light beam, and the second reflected light beam have an adjustment The same polarization state.
- the optical path direction adjusting components 305 and 306 adjust a propagation direction of the transmitted light beam or a propagation direction of the first reflected light beam and the second reflected light beam, and the transmitted light beam, the first reflected light beam, and the second reflected light beam have the same after adjustment Direction of communication.
- the beam size adjustment component 307 adjusts a size range of the transmitted beam or a size range of the first reflected beam and the second reflected beam, and the projected image size of the transmitted beam, the first reflected beam, and the second reflected beam are adjusted Consistent.
- the light modulator 309 modulates the adjusted transmitted light beam, the first reflected light beam, and the second reflected light beam into left-handed circularly polarized light and right-handed circularly polarized light in a frame order.
- the polarization conversion components 303 and 304 are placed in the first reflected beam 202 and the second reflected beam 203, respectively, placed adjacent to the opposite exit faces of the polarization beam splitting assembly 302, as shown in FIG.
- the polarization conversion components 303 and 304 are at least one twisted liquid crystal device, and the twisted liquid crystal device is generally a 90 degree twisted TN type liquid crystal device, and the light polarization direction of the twisted liquid crystal device and the twisted liquid crystal device liquid crystal When the alignment direction of the layer molecules is parallel or perpendicular, the polarization state of the light after passing through the twisted liquid crystal device will be rotated by 90 degrees. Increasing the amount of retardation of the twisted liquid crystal device contributes to a better polarization state.
- the optical path direction adjusting components 305 and 306 may be two mirrors respectively disposed on two sides of the reflecting surface of the polarization beam splitting component 302 for re-reflecting the reflected light beam to make the propagation direction thereof
- the transmitted beams propagate in the same direction, and the images formed by the transmitted beam, the first reflected beam and the second reflected beam on the metal screen are coincident by adjusting the angle.
- the polarization beam splitting assembly 302 is a polarization beam splitting prism group.
- the light modulator 309 is a liquid crystal light valve type light modulator.
- the low-projection high-efficiency stereoscopic projection device may further include a linear polarizer 308 located in front of the light modulator 309 to filter the transmitted light beam and the first reflection.
- the polarization states of the beam and the second reflected beam are identical, making it a more ideally polarized light.
- the polarization state conversion components 303 and 304 are at least one twist type liquid crystal device.
- the twisted liquid crystal device is placed in the optical path where the first reflected light beam and the second reflected light beam are located, and is located before the optical path direction adjusting component or after the optical path direction adjusting component, or after being placed in the beam size adjusting component Any position between the front of the light modulator.
- the polarization state of the transmitted beam is adjusted to be consistent with the polarization state of the reflected beam.
- a third embodiment as shown in FIG. 5, there are two twisted liquid crystal devices, and the twisted liquid crystal device is disposed in a reflected light beam between the two mirrors and the linear polarizer 308, respectively.
- the polarization state of the reflected beam is adjusted to coincide with the polarization state of the transmitted beam.
- the twisted liquid crystal device may be a conventional glass substrate-based liquid crystal device composed of a glass substrate, a transparent conductive layer, an alignment layer, a spacer, an edge sealing material, a liquid crystal material, or the like. It may also be a liquid crystal device based on a flexible plastic substrate, which is composed of a plastic substrate, a transparent conductive layer, an alignment layer, a spacer, an edge sealing material, a liquid crystal material, and the like. It may also be a polymer liquid crystal film based on a polymer technology, such as a TwistarTM film from DEJIMA. A liquid crystal device having a twisted structure should be considered to be within the scope of the present invention.
- the beam size adjustment component 307 is at least one lens or lens group placed at any of the optical paths where the transmitted beam, the first reflected beam, and the second reflected beam are located.
- the function of the lens or lens group is to enlarge or reduce the beam of the light path to be identical to the image size of the other beam on the metal curtain 310.
- the lens or lens group is placed in a variety of positions. Specifically, the lens or lens group is placed behind the polarizing beam splitting prism group, that is, between the polarizing beam splitting prism group and the linear polarizer 308, for expanding the transmitted light beam to be imaged on the metal screen 310.
- the image size of the reflected beam on the metal curtain 310 is uniform.
- the lens or lens group is respectively placed behind the two mirrors for narrowing down the reflected beam so that the image size on the metal screen is consistent with the image size of the transmitted beam on the metal screen.
- the lens or lens group can also be placed between the light modulator 309 and the metal curtain 310.
- a lens or lens group is typically placed between the polarization beam splitting assembly 302 and the linear polarizer 308.
- the light modulator is replaced with a quarter-wave retardation film; the quarter-wave retardation film is placed after the linear polarizer, after passing through the linear polarizer The polarized light is converted into left-handed circularly polarized light having an angle of 45 degrees and right-handed circularly polarized light having an angle of 135 degrees.
- the linear polarizer 308 acts as a separate component for both the transmitted and reflected beams to pass through the linear polarizer 308.
- three smaller sized linear polarization devices may be used instead of one integral linear polarization device 308 placed in the first reflected beam, the second reflected beam, and the transmitted beam, respectively.
- the light modulator 309 is a separate component in the above embodiments.
- three small-sized liquid crystal light valve type light modulators may be used instead, and respectively placed on the first reflected beam. The second reflected beam and the transmitted beam.
- the present invention also provides a low projection ratio high-efficiency stereoscopic projection system, including a projector 301, a metal curtain 310, and any low projection ratio high-efficiency stereoscopic projection as described above.
- the projector 301 sequentially plays the left eye image and the right eye image in a frame order;
- the metal curtain 310 may be a metal screen for imaging the reflected beam and the transmitted beam while irradiating the metal curtain 310.
- the light is reflected in the opposite circular polarization state, so that the light remains separated from the left and right eye images before entering the circularly polarized glasses worn by the viewer, and crosstalk of the left and right images is not generated.
- the viewer wears circularly polarized glasses to view the stereoscopic image in front of the metal curtain.
- the left and right spectacle lenses of the circularly polarized glasses are respectively a left-handed circular polarizing plate and a right-handed circular polarizing plate, which can separate the light reflected by the metal curtain, so as to enter
- the images of the left and right eyes are different, so as to achieve the purpose of separating the left and right eye images.
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Abstract
Description
Claims (10)
- 一种低投射比高光效立体投影装置,其特征在于,包括:偏振分光组件,将来自投影机的投射光束分束为透射光束、第一反射光束、第二反射光束;所述透射光束的偏振方向与所述第一反射光束、第二反射光束的偏振方向正交;偏振态转换组件,调整所述透射光束的偏振态或所述第一反射光束、第二反射光束的偏振态,调整后所述透射光束、第一反射光束、第二反射光束具有相同的偏振态;光路方向调整组件,调整所述透射光束的传播方向或所述第一反射光束、第二反射光束的传播方向,调整后所述透射光束、第一反射光束、第二反射光束具有相同的传播方向;光束大小调整组件,调整所述透射光束的大小范围或所述第一反射光束、第二反射光束的大小范围,调整后所述透射光束、第一反射光束、第二反射光束的所投影图像大小一致;光调制器,将被调整后的透射光束、第一反射光束、第二反射光束按照帧顺序调制为左旋圆偏振光和右旋圆偏振光。
- 根据权利要求1所述的低投射比高光效立体投影装置,其特征在于,所述偏振分光组件为偏振分光棱镜组;所述偏振分光棱镜组由三个45度棱镜镀膜、贴合形成,呈长方体,具有一个入射面,三个出射面,内部有两个分偏振面,所述两个分偏振面相互垂直,分别与所述入射面呈45度,所述两个分偏振面相交于入射面的中心线。
- 根据权利要求1所述的低投射比高光效立体投影装置,其特征在于,所述偏振态转换组件为至少一扭曲型液晶器件;所述扭曲型液晶器件放置于第一反射光束、第二反射光束所在的光路中且位于所述光路方向调整组件前或所述光路方向调整组件后,或放置于所述光束大小调整组件后与光调制器前之间的任一位置。
- 根据权利要求3所述的低投射比高光效立体投影装置,其特征在于,所述扭曲型液晶器件为基于玻璃基板的液晶器件、基于柔性塑料基板的液晶器件或基于聚合物技术的高分子液晶膜。
- 根据权利要求1所述的低投射比高光效立体投影装置,其特征在于,所述光路方向调整组件为两反射镜;所述两反射镜置于所述第一反射光束和第二反射光束的光路中。
- 根据权利要求1所述的低投射比高光效立体投影装置,其特征在于,所述光束大小调整组件为至少一透镜或透镜组,所述透镜或透镜组置于所述透射光束、第一反射光束和第二反射光束所在光路中的任一位置。
- 根据权利要求1所述的低投射比高光效立体投影装置,其特征在于,所述光调制器为液晶光阀型光调制器。
- 根据权利要求1所述的低投射比高光效立体投影装置,其特征在于,所述低投射比高光效立体投影装置还包括线偏振器,所述线偏振器位于所述光调制器前,通过过滤使透射光束、第一反射光束和第二反射光束的偏振状态一致。
- 根据权利要求1至8任一所述的低投射比高光效立体投影装置,其特征在于,所述光调制器替换为四分之一波长延迟膜,将所述透射光束、第一反射光束和第二反射光束转化为角度为45度的左旋圆偏振光和角度为135度的右旋圆偏振光。
- 一种低投射比高光效立体投影***,其特征在于,包括一投影机、金属幕和权利要求1至9任一所述的低投射比高光效立体投影装置;所述投影机以帧顺序依次播放左眼图像和右眼图像;所述金属幕用于对反射光束和透射光束进行成像,且成对光线以相反的圆偏振状态进行反射。
Priority Applications (5)
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EA201500108A EA030953B1 (ru) | 2013-09-05 | 2014-01-15 | Стереопроекционное устройство и стереопроекционная система с низким проекционным отношением и высокой светоотдачей |
AU2014271272A AU2014271272B2 (en) | 2013-09-05 | 2014-01-15 | Stereo projection apparatus and stereo projection system with low throw ratio and high light efficiency |
EP14796386.2A EP2869116A4 (en) | 2013-09-05 | 2014-01-15 | STEREOGRAPHIC PROJECTION DEVICE HAVING LOW PROJECTION RATIO AND HIGH LUMINOUS EFFECT AND STEREOGRAPHIC PROJECTION SYSTEM |
CA2885281A CA2885281C (en) | 2013-09-05 | 2014-01-15 | Stereo projection apparatus and stereo projection system with low throw ratio and high light efficiency |
US14/580,769 US9638926B2 (en) | 2013-09-05 | 2014-12-23 | Stereo projection apparatus and stereo projection system with low throw ratio and high light efficiency |
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CN201320549548.2U CN203405635U (zh) | 2013-09-05 | 2013-09-05 | 一种低投射比高光效立体投影装置及立体投影*** |
CN201320549548.2 | 2013-09-05 |
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US14/580,769 Continuation US9638926B2 (en) | 2013-09-05 | 2014-12-23 | Stereo projection apparatus and stereo projection system with low throw ratio and high light efficiency |
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US (1) | US9638926B2 (zh) |
EP (1) | EP2869116A4 (zh) |
CN (1) | CN203405635U (zh) |
AU (1) | AU2014271272B2 (zh) |
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WO2008042798A2 (en) | 2006-09-29 | 2008-04-10 | Colorlink, Inc. | Polarization conversion systems for stereoscopic projection |
AU2008251353B2 (en) | 2007-05-09 | 2014-05-22 | Reald Inc. | Polarization conversion system and method for stereoscopic projection |
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CA2885281A1 (en) | 2015-03-12 |
US9638926B2 (en) | 2017-05-02 |
EP2869116A4 (en) | 2016-01-20 |
CN203405635U (zh) | 2014-01-22 |
US20150109539A1 (en) | 2015-04-23 |
AU2014271272B2 (en) | 2019-02-14 |
EP2869116A1 (en) | 2015-05-06 |
CA2885281C (en) | 2018-08-21 |
AU2014271272A1 (en) | 2015-03-19 |
EA201500108A1 (ru) | 2016-06-30 |
EA030953B1 (ru) | 2018-10-31 |
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