WO2019104970A1 - 一种rtir光学元件组及其投影系统 - Google Patents

一种rtir光学元件组及其投影系统 Download PDF

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Publication number
WO2019104970A1
WO2019104970A1 PCT/CN2018/088976 CN2018088976W WO2019104970A1 WO 2019104970 A1 WO2019104970 A1 WO 2019104970A1 CN 2018088976 W CN2018088976 W CN 2018088976W WO 2019104970 A1 WO2019104970 A1 WO 2019104970A1
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Prior art keywords
optical element
rtir
projection
optical
illumination
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PCT/CN2018/088976
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English (en)
French (fr)
Inventor
高志强
杨伟樑
赵远
林清云
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广景视睿科技（深圳）有限公司
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Publication of WO2019104970A1 publication Critical patent/WO2019104970A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • 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

Definitions

  • the embodiments of the present application relate to the field of digital projection display technologies, and in particular, to an RTIR optical component group and a projection system thereof.
  • DLP digital light processing
  • the existing DLP projector usually uses an illumination prism to compensate the illumination source of the digital micro mirror device (DMD) to form a telecentric optical path for matching the incident light and the reflected light required by the DMD chip.
  • the projection beam emitted by the commonly used RTIR prism is perpendicular to the illumination beam, so that the DLP projector composed of the projection system using the RTIR prism is bulky and inconvenient to carry.
  • the inventors have proposed an RTIR optical component group that enables the projected projection beam to be parallel or coincident with the illumination beam, such that the projection system to which the RTIR optical component group is applied is linearly arranged, reducing the size of the DLP projector. At the same time, it is possible to correct the difference in projection images and improve the projection performance.
  • the technical problem to be solved by the embodiments of the present application is to provide an RTIR optical component group and a projection system thereof, which can reduce the size of the DLP projector, and at the same time, can correct the projection image difference and improve the projection performance.
  • a technical solution adopted by the embodiment of the present application is to provide an RTIR optical component group, which is applied to a projection system, and includes:
  • the third optical element being disposed between the first optical element and the second optical element, the illumination beam for emitting the first optical element Transmitted to the second optical element.
  • the first optical element includes: a first surface, a second surface, and a third surface;
  • the second optical element includes: a fourth surface, a fifth surface, and a sixth surface;
  • the third optical element includes: a seventh surface and an eighth surface
  • the second surface, the third surface, and the fourth surface have an internal total reflection interface.
  • first optical element and the second optical element are prisms, and the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface are all planar;
  • the cross-sectional shape of the first optical element is a triangle
  • the cross-sectional shape of the second optical element is an isosceles right triangle
  • the RFIR optical component group further includes:
  • the relay lens is disposed adjacent to the first surface, and/or the relay lens is disposed adjacent to the sixth surface.
  • the first optical element and/or the second optical element are curved prisms.
  • At least one surface of the first optical element and/or the second optical element is a curved surface.
  • the seventh surface and the eighth surface of the third optical element are planar, and the cross-sectional shape of the third optical element is trapezoidal.
  • the seventh surface and the eighth surface of the third optical element are curved surfaces.
  • a projection system including:
  • Illumination source DMD chip, projection lens and RTIR optical component set as described above;
  • the RTIR optical element group is disposed between the illumination source and the projection lens for receiving an illumination beam emitted by the illumination source, and optically converting the illumination beam to cause the illumination beam to be incident on the a DMD chip, and receiving a projection beam output by the DMD chip according to the illumination beam, and performing optical path conversion on the projection beam to be emitted to a projection lens;
  • the illumination beam emitted by the illumination source is parallel or coincident with the optical axis of the projection beam emitted by the RTIR optical element group, and the RTIR optical element group, the illumination source and the projection lens are arranged in a straight line.
  • the illumination source is adjacent to the first surface of the first optical element
  • the DMD chip is disposed adjacent to a fifth surface of the second optical component
  • the projection lens is adjacent to a sixth surface of the second optical element.
  • the embodiment of the present application provides an RTIR optical component group and a projection system thereof, the RTIR optical component group includes: a first optical component, a second optical component And a third optical element disposed between the first optical element and the second optical element for transmitting an illumination beam emitted by the first optical element to the second optical element,
  • the third optical element correcting the projection image difference, improving the projection performance, and at the same time, by providing the internal total reflection interface at the first optical element and the second optical element, the projection beam emitted from the RTIR optical element group is
  • the illumination beams are parallel or coincident, so that the projection system to which the RTIR optical element group is applied is arranged in a straight line, and the layout is compact and reasonable, which reduces the size of the DLP projector.
  • FIG. 1 is a schematic structural view of a projection system according to Embodiment 1;
  • FIG. 2 is a schematic structural view of an RTIR optical component group provided in Embodiment 1;
  • Embodiment 3 is a schematic structural diagram of a projection system provided in Embodiment 2;
  • FIG. 4 is a schematic structural view of an RTIR optical component group provided in Embodiment 2.
  • 1 is a projection system
  • 10 is an illumination source
  • 11 is a red LED source
  • 12 is a first collimating lens group
  • 13 is a green LED light source
  • 14 is a second collimating lens group
  • 15 is blue Color LED light source
  • 16 is the third collimating lens group
  • 17 is the dichroic lens group
  • 171 is the first dichroic lens
  • 172 is the second dichroic lens
  • 18 is the compound eye lens
  • 20 is the RTIR optical component group
  • 21 is The first optical element
  • 22 is the second optical element
  • 23 is the third optical element
  • 24 is the relay lens
  • P1 is the first surface
  • P2 is the second surface
  • P3 is the third surface
  • P4 is the fourth surface
  • 30 is the DMD chip
  • 40 is the projection lens.
  • the RTIR optical component group and the projection system thereof can be applied to a Digital Light Processing (DLP) projector, which is implemented by a Digital Micro Mirror (DMD) chip.
  • DLP Digital Light Processing
  • DMD Digital Micro Mirror
  • the imaging device is used to implement projection, wherein the illumination source of the DMD chip is compensated by the RTIR optical component group, and different RTIR optical component groups have different effects on the projection performance of the projection system.
  • the RTIR optical element group and its projection system will be specifically described below by several embodiments.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 1 is a projection system provided by an embodiment of the present application.
  • the projection system 1 includes an illumination source 10 , an RTIR optical component group 20 , a DMD chip 30 , and a projection lens 40 .
  • the RTIR optical element group 20 is disposed between the illumination light source 10 and the projection lens 40, and is located in a normal direction of the receiving surface of the DMD chip 30.
  • the illumination light source 10, the RTIR optical element group 20, and the projection lens 40 are arranged in a straight line.
  • the layout of the projection system 1 is made compact and reasonable.
  • the receiving surface of the DMD chip 30 faces the RTIR optical element group 20 such that the illumination beam (a4 shown in FIG. 1) emitted from the RTIR optical element group 20 can be received by the receiving surface of the DMD chip 30 while The projection beam output from the DMD chip 30 (shown as a5 in FIG. 2) can also be incident on the RTIR optical element group 20.
  • the RTIR optical component group 20 is located below the receiving surface of the DMD chip 30.
  • the RTIR optical component group 20 may also be located in the DMD chip 30. Above, on the left or right side of the receiving surface.
  • the optical path of the projection system 1 is specifically: an illumination beam emitted from the illumination source 10 (a1 shown in FIG. 1), received by the RTIR optical element group 20, and optically converted, and the illumination path after the optical path conversion ( As shown in FIG. 1, a4) is emitted from the RTIR optical element group 20 to the DMD chip 30, and the DMD chip 30 outputs a projection beam (a5 as shown in FIG. 1) and is incident on the RTIR optical element group 20 to perform an optical path.
  • the converted, optical path converted projection beam (a6 as shown in FIG. 1) is emitted from the RTIR optical element group 20 to the projection lens 40.
  • the illumination beam emitted by the illumination source 10 shown as a1 in FIG.
  • the illumination source 10 and the projection lens 40 can be arranged in a straight line, thereby making the layout of the projection system 1 more compact and reasonable, and reducing the size of the DLP projector.
  • the illumination source 10 is used to generate a white illumination beam.
  • the illumination light source 10 includes: a red LED light source 11 and a first collimating lens group 12 disposed in front of the optical path, a green LED light source 13 and a second collimating lens group 14 disposed at a front side of the optical path thereof, and a blue LED
  • the light source 15 and the third collimating lens group 16, the dichroic lens group 17, and the fly-eye lens 18 disposed directly in front of the optical path.
  • the dichroic lens group comprises: a first dichroic lens 171 and a second dichroic lens 172 disposed vertically, and the light combining the three colors of the LED light source is realized by reflecting and/or transmitting light of different colors to generate a white illumination beam.
  • the illumination source 10 can also be a white LED source integrated by RGB tri-color LED chips, capable of directly obtaining a white illumination beam.
  • the DMD chip 30 is used to output a projection beam, and the projection lens 40 is used to project the projection beam into an external display screen to realize projection.
  • the 2 is an RTIR optical component group for receiving an illumination beam emitted by an illumination source 10, and performing optical path conversion on the illumination beam to enable the
  • the illumination beam is incident on the DMD chip 30, and receives the projection beam output by the DMD chip 30 according to the illumination beam, and optically converts the projection beam to the projection lens 40, specifically including: a first optical component 21, The second optical element 22 and the third optical element 23.
  • the first optical element 21 includes a first surface P1, a second surface P2, and a third surface P3, wherein the second surface P2 and the third surface P3 have a total internal reflection interface.
  • the second optical element 22 includes a fourth surface P4, a fifth surface P5, and a sixth surface P6, wherein the fourth surface P4 has a total internal reflection interface.
  • the third optical element 23 includes a seventh surface P7 and an eighth surface P8, and the third optical element 23 is disposed between the first optical element 21 and the second optical element 22, specifically, the The seventh surface P7 of the three optical elements 23 is disposed adjacent to the second surface P2 of the first optical element 21, and the seventh surface P7 and the second surface P2 are optically coupled via a slight air gap; the third The eighth surface P8 of the optical element 23 is disposed adjacent to the fourth surface P4 of the second optical element 22, and the eighth surface P8 and the fourth surface P4 are optically coupled by a slight air gap.
  • the third optical element 23 is configured to transmit an illumination beam emitted by the first optical element 21 to the second optical element, specifically, an illumination beam transmitted from the second surface P2 of the first optical element 21
  • the refraction occurs in the three optical elements 23 and is transmitted through the third optical element 23 into the fourth surface P4 of the second optical element 22, so that the fourth surface P4 fully exerts a compensating action.
  • the third optical element 23 is capable of correcting the angle at which the illumination beam is incident on the DMD chip 30 by refraction, reducing picture distortion and optical image. difference.
  • the refractive index of the third optical element 23 is smaller than the refractive indices of the first optical element 21 and the second optical element 22, and is close to the refractive index of the air.
  • the illumination beam incident on the third optical element 23 is refracted to a different extent, thereby correcting the illumination beam that is emitted to the DMD chip 30, so that it is emitted from the second optical element 22.
  • the projection beam to the projection lens can be completely incident on the projection lens 40, reducing picture distortion and optical aberration, improving projection performance, and enabling the projection beam emitted from the second optical element 22 and the illumination beam optical axis emitted from the illumination source 10
  • the coincidence makes the layout of the projection system 1 compact and reasonable, reducing the size of the DLP projector.
  • the refractive index of the third optical element 23 may also be the same as the refractive indices of the first optical element 21 and the second optical element 22.
  • the first optical element 21 and the second optical element 22 are prisms, that is, the first surface P1, the second surface P2, the third surface P3, the fourth surface P4, and the fifth surface P5.
  • the sixth surface P6 is flat.
  • the first optical element 21 and/or the second optical element 22 are curved prisms, and at least one surface of the first optical element 21 and/or the second optical element 22 is Surface.
  • the first optical element 21 has a triangular cross-sectional shape, and the angle between the second surface P2 and the third surface P3 is 20° to 45°, which satisfies Snell's law, so that the second surface P2 and the first surface
  • the three surfaces P3 have an internal total reflection interface, and by adjusting the angle between the second surface P2 and the third surface P3, the projection beam of the RTIR optical element group 20 that is emitted to the projection lens 40 and the illumination source 10 can be emitted.
  • the optical axes of the illumination beams coincide to improve projection performance.
  • the second optical element 22 has a cross-sectional shape of an isosceles right triangle, the fifth surface P5 is perpendicular to the sixth surface P6, and the fourth surface P4 is sandwiched by the fifth surface P5 and the sixth surface P6.
  • the angles are all 45°, satisfying Snell's law, so that the fourth surface P4 has an internal total reflection interface.
  • the cross-sectional shape of the third optical element 23 is trapezoidal, and the seventh surface P7 and the eighth surface P8 are planar.
  • the seventh surface P7 and the eighth surface P8 may also be curved surfaces to enable convergence compensation alignment of the illumination beam.
  • the third surface P3 of the first optical element 21 is perpendicular to the sixth surface P6 of the second optical element 22, and is disposed opposite to the fifth surface P5, the sixth surface P6 and the third surface Surface P3 is not connected.
  • first optical element 21 and the second optical element 22 are made of the same material, generally being optical, glass or quartz glass, uniform, crack-free, isotropic, good transmittance, high dispersion rate, and low temperature coefficient. .
  • the refractive indices of the first optical element 21 and the second optical element 22 are both greater than the refractive index of the air.
  • the RTIR optical element group 20 further includes: a relay lens 24 disposed adjacent to the first surface P1 for performing illumination light emitted from the illumination source 10 Convergence compensation to improve projection performance.
  • the relay lens 24 is disposed adjacent to the sixth surface P6 for performing convergence compensation on the projection beam that is emitted to the projection lens 40 to improve projection performance.
  • the relay lens 24 may also be disposed on the first surface P1 and the sixth surface P6 at the same time.
  • the illumination source 10 is adjacent to the first surface P1, and a relay lens 24 is disposed between the illumination source 10 and the first surface P1 for the illumination source.
  • 10 emitted illumination beam is subjected to convergence compensation to improve projection performance;
  • the DMD chip 30 is disposed adjacent to the fifth surface P5 and parallel to the fifth surface P5;
  • the projection lens 40 is adjacent to the sixth surface P6, and disposed in parallel with the sixth surface P6, such that a central optical axis of the projection beam totally reflected by the fourth surface P4 of the second optical element 22 is perpendicular to the sixth surface P6, and further, perpendicularly incident to the projection lens 40.
  • the specific process of the optical path conversion of the RTIR optical element group 20 is that the illumination light beam is refracted into the first optical element 21 via the relay lens 24, is received by the first surface P1 of the first optical element 21, and is refracted to
  • the second surface P2 is totally emitted to the third surface P3 at the second surface P2, is totally reflected to the third optical element 23 at the third surface P3, and is transmitted to the second optical element 22 via the third optical element 23,
  • the fifth surface P5 of the second optical element 22 is emitted to the DMD chip 30, and the output light beam of the DMD chip 30 is outputted to the fourth surface P4 via the fifth surface P5, and after the total reflection is emitted on the fourth surface P4, via the sixth
  • the surface P6 is transmitted to the projection lens 40, and at this time, the projection beam transmitted through the sixth surface P6 to the projection lens 40 is parallel or coincident with the optical axis of the illumination beam, so that the RTIR optical element group 20, the illumination source 10, and the projection lens
  • the 40 can
  • the embodiment of the present application provides an RTIR optical component group and a projection system thereof, the RTIR optical component group includes: a first optical component, a second optical component And a third optical element disposed between the first optical element and the second optical element for transmitting an illumination beam emitted by the first optical element to the second optical element,
  • the third optical element correcting the projection image difference, improving the projection performance, and at the same time, by providing the internal total reflection interface at the first optical element and the second optical element, the projection beam emitted from the RTIR optical element group is
  • the illumination beams are parallel or coincident, so that the projection system to which the RTIR optical element group is applied is arranged in a straight line, and the layout is compact and reasonable, which reduces the size of the DLP projector.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 3 is a projection system provided by an embodiment of the present application.
  • the projection system 1 is substantially the same as the first embodiment.
  • the first optical element 21 and/or the second optical element 22 of the RTIR optical element group 20 are curved prisms
  • the curved prism is the first optical element 21 and Or at least one of the second optical elements 22 having a curved surface
  • the right angle prism and the relay in the first embodiment are replaced by providing a curved surface on at least one surface of the first optical element 21 and/or the second optical element 22.
  • the combination of the lenses 24 converges the illumination beam emitted from the illumination source 10 and/or the projection beam emitted to the projection lens 40 to improve projection performance.
  • the surface is a freeform surface and can be described by:
  • Z is the height of the surface
  • X and Y are the projection coordinates of the height of the surface on the optical axis
  • A1 to A9 are positional parameters
  • c and k are curvature parameters.
  • the first surface P1 and the third surface P3 of the first optical element 21 are disposed as curved surfaces, when the illumination light emitted by the illumination source 10 is incident on the first surface P1.
  • the first surface P1 concentrates the light to the target position of the second surface P2, and is totally reflected to the third surface P3 via the second surface P2.
  • the third surface P3 is again compensated for the light convergence, so that the illumination beam can be completely incident on the DMD. Projection is performed in the chip 30 to improve projection performance.
  • a curved surface may also be disposed on the second optical element 22, or both the first optical element 21 and the second optical element 22 may be provided with a curved surface, and the curved surface may be set in one
  • the surface may be disposed on both surfaces, or the surface may be provided with a curved surface or the like, and any combination may be made, which will not be described herein.
  • the seventh surface P7 and the eighth surface P8 of the third optical element 23 are planes. In some alternative embodiments, the seventh surface P7 and the eighth surface P8 of the third optical element 23 may also be curved to enable convergence compensation alignment of the illumination beam.
  • the embodiment of the present application provides an RTIR optical component group and a projection system thereof, the RTIR optical component group includes: a first optical component, a second optical component And a third optical element disposed between the first optical element and the second optical element for transmitting an illumination beam emitted by the first optical element to the second optical element,
  • the third optical element correcting the projection image difference, improving the projection performance, and at the same time, by providing the internal total reflection interface at the first optical element and the second optical element, the projection beam emitted from the RTIR optical element group is
  • the illumination beams are parallel or coincident, so that the projection system to which the RTIR optical element group is applied is arranged in a straight line, and the layout is compact and reasonable, which reduces the size of the DLP projector.
  • the specific structure of the RTIR optical element group is not limited to the above-described manner, and the illumination path and the projection beam can be totally reflected by the RTIR optical element group to realize the optical path conversion.
  • the linear arrangement of the illumination source and the projection system is within the protection scope of the present application; the structural form of the illumination source is not limited to the structure of the embodiment.

Abstract

一种RTIR光学元件组及投影系统，RTIR光学元件组包括：第一光学元件(21)、第二光学元件(22)和第三光学元件(23)，第三光学元件(23)设置于第一光学元件(21)和第二光学元件(22)之间，用于将第一光学元件(21)出射的照明光束透射至第二光学元件(22)，从而，能够减小DLP投影机的尺寸，同时，能够校正投影像差，提高投影性能。

Description

一种RTIR光学元件组及其投影系统
本申请要求于2017年12月1日提交中国专利局，申请号为2017216594808，发明名称为“一种RTIR光学元件组及其投影系统”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
本申请实施例涉及数字投影显示技术领域，特别是涉及一种RTIR光学元件组及其投影系统。
背景技术
随着半导体技术的发展，便携式电子产品日趋多样化，使得微型投影机的需求越来越大，目前，较为常见的为数字光处理(Digital Light Processing,DLP)投影机。
现有的DLP投影机通常采用照明棱镜对数字微镜晶片(Digital Micro mirror Device，DMD)的照明光源进行补偿，形成远心光路，用以匹配DMD芯片所需要的入射光线和反射光线。而目前常用的RTIR棱镜出射的投影光束与照明光束垂直，使得应用该RTIR棱镜的投影系统组成的DLP投影机体积较为庞大，不便于携带。
于是，发明人提出了一种RTIR光学元件组，能够使得出射的投影光束与照明光束平行或者重合，使得应用所述RTIR光学元件组的投影系统呈直线型排列，减小DLP投影机的尺寸，同时，能够校正投影像差，提高投影性能。
发明内容
本申请实施例主要解决的技术问题是提供一种RTIR光学元件组及其投影系统，能够减小DLP投影机的尺寸，同时，能够校正投影像差，提高投影性能。
为解决上述技术问题，本申请实施例采用的一个技术方案是：提供一种RTIR光学元件组，应用于投影系统，包括：
第一光学元件、第二光学元件和第三光学元件，所述第三光学元件设置于所述第一光学元件和第二光学元件之间，用于将所述第一光学元件出射的照明光束透射至所述第二光学元件。
可选地，所述第一光学元件包括：第一表面、第二表面和第三表面；
所述第二光学元件包括：第四表面、第五表面和第六表面；
所述第三光学元件包括：第七表面和第八表面；
所述第三光学元件的第七表面与所述第一光学元件的第二表面之间具有间隙，所述第三光学元件的第八表面与所述第二光学元件的第四表面之间具有间隙；
所述第二表面、第三表面和第四表面具有内全反射界面。
可选地，所述第一光学元件和第二光学元件为棱镜，所述第一表面、第二表面、第三表面、第四表面、第五表面和第六表面均为平面；
所述第一光学元件的剖面形状为三角形，所述第二光学元件的剖面形状为等腰直角三角形。
可选地，所述RFIR光学元件组还包括：
中继透镜；
所述中继透镜邻近设置于第一表面，和/或，所述中继透镜邻近设置于第六表面。
可选地，所述第一光学元件和/或第二光学元件为曲面棱镜。
可选地，所述第一光学元件和/或所述第二光学元件至少一个表面为曲面。
可选地，所述第三光学元件的第七表面和第八表面为平面，所述第三光学元件的剖面形状为梯形。
可选地，所述第三光学元件的第七表面和第八表面为曲面。
为解决上述技术问题，本申请实施例采用的另一个技术方案是：提供一种投影系统，包括：
照明光源、DMD芯片、投影镜头和以上所述的RTIR光学元件组；
所述RTIR光学元件组设置于所述照明光源和投影镜头之间，用于接收所述照明光源出射的照明光束，并且对所述照明光束进行光路转换，以使所述照明光束入射至所述DMD芯片，以及接收所述DMD芯片根据所述照明光束输出的投影光束，并且对所述投影光束进行光路转换后出射至投影镜头；
所述照明光源出射的照明光束与所述RTIR光学元件组出射的投影光束光轴平行或者重合，所述RTIR光学元件组、照明光源和投影镜头呈直线型排列。
可选地，所述照明光源邻近所述第一光学元件的第一表面；
所述DMD芯片邻近设置于所述第二光学元件的第五表面；
所述投影镜头邻近所述第二光学元件的第六表面。
本申请实施例的有益效果是：区别于现有技术的情况，本申请实施例提供一种RTIR光学元件组及其投影系统，所述RTIR光学元件组包括：第一光学元件、第二光学元件和第三光学元件，所述第三光学元件设置于所述第一光学元件和第二光学元件之间，用于将所述第一光学元件出射的照明光束透射至所述第二光学元件，通过设置所述第三光学元件，校正投影像差，提高投影性能，同时，通过在所述第一光学元件和第二光学元件设置内全反射界面，使得从RTIR光学元件组出射的投影光束与照明光束平行或者重合，使得应用所述RTIR光学元件组的投影系统呈直线型排列，布局紧凑合理，减小了DLP投影机的尺寸。
附图说明
一个或多个实施通过与之对应的附图进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是实施例一提供的一种投影系统的结构示意图；
图2是实施例一提供的一种RTIR光学元件组的结构示意图；
图3是实施例二提供的一种投影系统的结构示意图；
图4是实施例二提供的一种RTIR光学元件组的结构示意图。
参阅图1至图4,1为投影系统；10为照明光源，11为红色LED光源，12为第一准直透镜组，13为绿色LED光源，14为第二准直透镜组，15为蓝色LED光源，16为第三准直透镜组，17为分色镜片组，171为第一分色镜片，172为第二分色镜片，18为复眼透镜；20为RTIR光学元件组，21为第一光学元件，22为第二光学元件，23为第三光学元件；24为中继透镜，P1为第一表面，P2为第二表面，P3为第三表面，P4为第四表面，P5为第五表面，P6为第六表面，P7为第七表面，P8为第八表面；30为DMD芯片，40为投影镜头。
具体实施方式
为了便于理解本申请，下面结合附图和具体实施例，对本申请进行更详细的说明。需要说明的是，当元件被表述“固定于”另一个元件，它可以直接在另一个元件上、或者其间可以存在一个或多个居中的元件。当一个元件被表述“连接”另一个元件，它可以是直接连接到另一个元件、或者其间可以存在一个或多个居中的元件。本说明书所使用的术语“垂直的”、“水平的”、“左”、“右”以及类似的表述只是为了说明的目的。
除非另有定义，本说明书所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本说明书中在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是用于限制本申请。本说明书所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。
本申请实施例所述的RTIR光学元件组及其投影系统，能够应用于数字光处理(Digital Light Processing，DLP)投影机中，该投影系 统以数字微镜晶片(Digital Micro mirror Device，DMD)作为成像器件来实现投影，其中，通过RTIR光学元件组对DMD芯片的照明光源进行补偿，不同的RTIR光学元件组对投影系统的投影性能造成不同影响。下面将通过几个实施例对该RTIR光学元件组及其投影系统进行具体阐述。
实施例一：
请参阅图1，是本申请实施例提供的一种投影系统，该投影系统1包括：照明光源10、RTIR光学元件组20、DMD芯片30和投影镜头40。
RTIR光学元件组20设置于照明光源10和投影镜头40之间，并且位于DMD芯片30接收面的法线方向上，所述照明光源10、RTIR光学元件组20和投影镜头40呈直线型排列，使得投影系统1的布局紧凑合理。
具体地，所述DMD芯片30的接收面朝向所述RTIR光学元件组20，使得从RTIR光学元件组20出射的照明光束(如图1所示a4)能够被DMD芯片30的接收面接收，同时，DMD芯片30输出的投影光束(如图2所示a5)也能够入射至所述RTIR光学元件组20。
在本申请实施例中，所述RTIR光学元件组20位于所述DMD芯片30的接收面下方，当然，在一些可替代实施例中，所述RTIR光学元件组20还可以位于所述DMD芯片30的接收面上方、左侧或者右侧等。
可以理解的是，该投影系统1的光路具体为：从照明光源10出射的照明光束(如图1所示a1)，被RTIR光学元件组20接收并进行光路转换，光路转换后的照明光束(如图1所示a4)从所述RTIR光学元件组20出射至DMD芯片30，所述DMD芯片30输出投影光束(如图1所示a5)并入射至所述RTIR光学元件组20，进行光路转换，光路转换后的投影光束(如图1所示a6)从所述RTIR光学元件组20出射至投影镜头40。其中，所述照明光源10出射的照明光束(如图1所示a1)与所述RTIR光学元件组20出射的投影光束(如图1所示a6)光轴平行或者重合，使得RTIR光学元件组20、照明光源10和投影镜头40能够呈直线型排列，进而使得投影系统1的布局更为紧凑合理，减小了DLP投影机 的尺寸。
具体地，所述照明光源10用于产生白色照明光束。所述照明光源10包括：红色LED光源11以及设置于其光路正前方的第一准直透镜组12、绿色LED光源13以及设置于其光路正前方的第二准直透镜组14、蓝色LED光源15以及设置于其光路正前方的第三准直透镜组16、分色镜片组17以及复眼透镜18。所述分色镜片组包括：垂直设置的第一分色镜片171和第二分色镜片172，通过反射和/或透射不同颜色的光，实现三色LED光源的合光，产生白色照明光束。
在一些可替代实施例中，所述照明光源10还可以为由RGB三色LED芯片集成的白色LED光源，能够直接得到白色照明光束。
所述DMD芯片30用于输出投影光束，投影镜头40则用于将所述投影光束投影至外部显示屏中，实现投影。
请参阅图2，是本申请实施例提供的一种RTIR光学元件组，该RTIR光学元件组20用于接收照明光源10出射的照明光束，并且对所述照明光束进行光路转换，以使所述照明光束入射至DMD芯片30，以及接收所述DMD芯片30根据所述照明光束输出的投影光束，并且对所述投影光束进行光路转换后出射至投影镜头40，具体包括：第一光学元件21、第二光学元件22和第三光学元件23。
所述第一光学元件21包括：第一表面P1、第二表面P2和第三表面P3，其中，所述第二表面P2和第三表面P3具有全内反射界面。
所述第二光学元件22包括：第四表面P4、第五表面P5和第六表面P6，其中，所述第四表面P4具有全内反射界面。
所述第三光学元件23包括：第七表面P7和第八表面P8，所述第三光学元件23设置于所述第一光学元件21和第二光学元件22之间，具体地，所述第三光学元件23的第七表面P7临近设置于所述第一光学元件21的第二表面P2，所述第七表面P7和第二表面P2之间经过微小的空气间隙光学耦合；所述第三光学元件23的第八表面P8邻居设置于所 述第二光学元件22的第四表面P4，所述第八表面P8和第四表面P4之间经过微小的空气间隙光学耦合。
所述第三光学元件23用于将所述第一光学元件21出射的照明光束透射至所述第二光学元件，具体地，从第一光学元件21的第二表面P2透射的照明光束在第三光学元件23中发生折射，并经第三光学元件23透射进入第二光学元件22的第四表面P4，使得第四表面P4充分发挥补偿作用。特别是，当照明光束以小于特定角度的入射角入射至第三光学元件23时，所述第三光学元件23能够通过折射校正照明光束入射至DMD芯片30的角度，减小画面畸变和光学像差。
其中，所述第三光学元件23的折射率小于所述第一光学元件21和第二光学元件22的折射率，并且接近空气折射率。能够通过改变第三光学元件23的折射率，使得入射至所述第三光学元件23的照明光束发生不同程度的折射，进而校正出射至DMD芯片30的照明光束，使得从第二光学元件22出射至投影镜头的投影光束能够完全入射至投影镜头40，减小画面畸变和光学像差，提高投影性能，并且能够使得从第二光学元件22出射的投影光束与照明光源10出射的照明光束光轴重合，使得投影系统1的布局紧凑合理，减小DLP投影机的尺寸。
当然，在一些可替代实施例中，所述第三光学元件23的折射率也可以与所述第一光学元件21和第二光学元件22的折射率相同。
在本申请实施例中，所述第一光学元件21和第二光学元件22为棱镜，即所述第一表面P1、第二表面P2、第三表面P3、第四表面P4、第五表面P5和第六表面P6均为平面。当然，在一些可替代实施例中，所述第一光学元件21和/或第二光学元件22为曲面棱镜，所述第一光学元件21和/或所述第二光学元件22至少一个表面为曲面。
其中，所述第一光学元件21剖面形状为三角形，所述第二表面P2和第三表面P3之间的夹角为20°至45°，满足斯涅耳定律，使得第二表面P2和第三表面P3具有内全反射界面，并且通过调整所述第二表面P2和第三表面P3之间的夹角，能够使得RTIR光学元件组20出射至投 影镜头40的投影光束与照明光源10出射的照明光束光轴重合，提高投影性能。
所述第二光学元件22剖面形状为等腰直角三角形，所述第五表面P5垂直于所述第六表面P6，所述第四表面P4与所述第五表面P5和第六表面P6的夹角均为45°，满足斯涅耳定律，使得所述第四表面P4具有内全反射界面。
所述第三光学元件23的剖面形状为梯形，其第七表面P7和第八表面P8为平面。当然，在一些可替代实施例中，所述第七表面P7和第八表面P8还可以为曲面，能够对照明光束进行汇聚补偿对准。
进一步地，所述第一光学元件21的第三表面P3与第二光学元件22的第六表面P6垂直，且与所述第五表面P5相对设置，所述第六表面P6和所述第三表面P3不连接。
进一步地，所述第一光学元件21和第二光学元件22材质相同，一般为光学玻璃或者石英玻璃等均匀、无裂纹、各向同性、透光度好、色散率高，温度系数小的材质。所述第一光学元件21和第二光学元件22的折射率均大于所述空气折射率。
进一步地，在本申请实施例中，所述RTIR光学元件组20还包括：中继透镜24，所述中继透镜24邻近设置于第一表面P1，用于对照明光源10出射的照明光束进行汇聚补偿，提高投影性能。
在一些可替代实施例中，所述中继透镜24邻近设置于第六表面P6，用于对出射至投影镜头40的投影光束进行汇聚补偿，提高投影性能。
当然，在一些实施例中，所述中继透镜24还可以同时设置在所述第一表面P1和第六表面P6。
请再参阅图1，在投影系统1中，所述照明光源10邻近于所述第一表面P1，在所述照明光源10和第一表面P1之间设置中继透镜24，用于对照明光源10出射的照明光束进行汇聚补偿，提高投影性能；所述DMD芯片30邻近设置于所述第五表面P5，并与所述第五表面P5平行； 所述投影镜头40邻近于所述第六表面P6，并与所述第六表面P6平行设置，使得经第二光学元件22的第四表面P4全反射的投影光束的中心光轴与所述第六表面P6垂直，进而，垂直入射至投影镜头40。
可以理解的是，该RTIR光学元件组20进行光路转换的具体过程为：照明光束经由中继透镜24折射入射至第一光学元件21，被第一光学元件21的第一表面P1接收并折射至第二表面P2，在第二表面P2全发射至第三表面P3，在第三表面P3全反射至第三光学元件23，经由所述第三光学元件23透射至第二光学元件22，从所述第二光学元件22的第五表面P5出射至DMD芯片30，所述DMD芯片30输出投影光束经第五表面P5出射至第四表面P4，在第四表面P4发射全反射后，经由第六表面P6透射出射至投影镜头40，此时，经第六表面P6透射出射至投影镜头40的投影光束与所述照明光束光轴平行或重合，使得RTIR光学元件组20、照明光源10和投影镜头40能够呈直线型排列，进而使得投影系统1的布局更为紧凑合理，减小了DLP投影机的尺寸。
本申请实施例的有益效果是：区别于现有技术的情况，本申请实施例提供一种RTIR光学元件组及其投影系统，所述RTIR光学元件组包括：第一光学元件、第二光学元件和第三光学元件，所述第三光学元件设置于所述第一光学元件和第二光学元件之间，用于将所述第一光学元件出射的照明光束透射至所述第二光学元件，通过设置所述第三光学元件，校正投影像差，提高投影性能，同时，通过在所述第一光学元件和第二光学元件设置内全反射界面，使得从RTIR光学元件组出射的投影光束与照明光束平行或者重合，使得应用所述RTIR光学元件组的投影系统呈直线型排列，布局紧凑合理，减小了DLP投影机的尺寸。
实施例二：
请参阅图3，是本申请实施例提供的一种投影系统，该投影系统1与实施例一相比基本相同，相同内容请参阅实施例一，在此不一一赘述。
其区别点在于，在本申请实施例中，所述RTIR光学元件组20的第一光学元件21和/或第二光学元件22为曲面棱镜，所述曲面棱镜即为 在第一光学元件21和/或第二光学元件22中至少有一个表面为曲面的棱镜，通过在第一光学元件21和/或第二光学元件22的至少一个表面设置曲面来代替实施例一中的直角棱镜和中继透镜24的组合，对照明光源10出射的照明光束和/或出射至投影镜头40的投影光束进行汇聚补偿，提高投影性能。
所述曲面为自由曲面，可以由下式描述：
Figure PCTCN2018088976-appb-000001
其中，Z为曲面高度，X、Y分别为曲面高度在光轴的投影坐标，A1到A9为位置参数，c和k为曲率参数。
具体地，请参阅图4，在本申请实施例中，第一光学元件21的第一表面P1和第三表面P3设置为曲面，当照明光源10出射的照明光束入射至该第一表面P1时，第一表面P1会将光线汇聚至第二表面P2的目标位置，经由第二表面P2全反射至第三表面P3，第三表面P3又再次进行光线汇聚补偿，使得照明光束能够完全入射至DMD芯片30中进行投影，提高投影性能。
可以理解的是，在一些可替代实施例中，也可以在第二光学元件22上设置曲面，或者，第一光学元件21和第二光学元件22均设置曲面，所设置的曲面可以为在一个表面上设置，也可以为在两个表面上设置，或者所以表面均设置曲面等等，能够进行任意组合，在此不一一赘述。
在本申请实施例中，所述第三光学元件23的第七表面P7和第八表面P8为平面。在一些可替代实施例中，所述第三光学元件23的第七表面P7和第八表面P8还可以为曲面，能够对照明光束进行汇聚补偿对准。
本申请实施例的有益效果是：区别于现有技术的情况，本申请实施例提供一种RTIR光学元件组及其投影系统，所述RTIR光学元件组包括：第一光学元件、第二光学元件和第三光学元件，所述第三光学元件设置于所述第一光学元件和第二光学元件之间，用于将所述第一光学元件出 射的照明光束透射至所述第二光学元件，通过设置所述第三光学元件，校正投影像差，提高投影性能，同时，通过在所述第一光学元件和第二光学元件设置内全反射界面，使得从RTIR光学元件组出射的投影光束与照明光束平行或者重合，使得应用所述RTIR光学元件组的投影系统呈直线型排列，布局紧凑合理，减小了DLP投影机的尺寸。
值得注意的是，在上述实施例中，所述RTIR光学元件组的具体结构并不限于上述所描述的方式，凡是可借助RTIR光学元件组对照明光束和投影光束进行全反射，实现光路的转换，使照明光源和投影系统呈直线型排列均属于本申请的保护范围；所述照明光源的结构形式也并不限于实施例的结构。
需要说明的是，本申请的说明书及其附图中给出了本申请的较佳的实施例，但是，本申请可以通过许多不同的形式来实现，并不限于本说明书所描述的实施例，这些实施例不作为对本申请内容的额外限制，提供这些实施例的目的是使对本申请的公开内容的理解更加透彻全面。并且，上述各技术特征继续相互组合，形成未在上面列举的各种实施例，均视为本申请说明书记载的范围；进一步地，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，而所有这些改进和变换都应属于本申请所附权利要求的保护范围。

Claims (10)

  1. 一种RTIR光学元件组，应用于投影系统(1)，其特征在于，包括：
    第一光学元件(21)、第二光学元件(22)和第三光学元件(23)，所述第三光学元件(23)设置于所述第一光学元件(21)和第二光学元件(22)之间，用于将所述第一光学元件(21)出射的照明光束透射至所述第二光学元件(22)。
  2. 根据权利要求1所述RTIR光学元件组，其特征在于，
    所述第一光学元件(21)包括：第一表面(P1)、第二表面(P2)和第三表面(P3)；
    所述第二光学元件(22)包括：第四表面(P4)、第五表面(P5)和第六表面(P6)；
    所述第三光学元件(23)包括：第七表面(P7)和第八表面(P8)；
    所述第三光学元件(23)的第七表面(P7)与所述第一光学元件(21)的第二表面(P2)之间具有间隙，所述第三光学元件(23)的第八表面(P8)与所述第二光学元件(22)的第四表面(P4)之间具有间隙；
    所述第二表面(P2)、第三表面(P3)和第四表面(P4)具有内全反射界面。
  3. 根据权利要求2所述的RTIR光学元件组，其特征在于，
    所述第一光学元件(21)和第二光学元件(22)为棱镜，所述第一表面(P1)、第二表面(P2)、第三表面(P3)、第四表面(P4)、第五表面(P5)和第六表面(P6)均为平面；
    所述第一光学元件(21)的剖面形状为三角形，所述第二光学元件(22)的剖面形状为等腰直角三角形。
  4. 根据权利要求3所述的RTIR光学元件组，其特征在于，
    所述RTIR光学元件组(20)还包括：中继透镜(24)；
    所述中继透镜(24)邻近设置于第一表面(P1)，和/或，所述中继透镜(24)邻近设置于第六表面(P6)。
  5. 根据权利要求2所述的RTIR光学元件组，其特征在于，
    所述第一光学元件(21)和/或第二光学元件(22)为曲面棱镜。
  6. 根据权利要求5所述的RTIR光学元件组，其特征在于，所述第一光学元件(21)和/或所述第二光学元件(22)至少一个表面为曲面。
  7. 根据权利要求1-6任一项所述的RTIR光学元件组，其特征在于，所述第三光学元件(23)的第七表面(P7)和第八表面(P8)为平面，所述第三光学元件(23)的剖面形状为梯形。
  8. 根据权利要求1-6任一项所述的RTIR光学元件组，其特征在于，所述第三光学元件(23)的第七表面(P7)和第八表面(P8)为曲面。
  9. 一种投影系统，其特征在于，包括：
    照明光源(10)、DMD芯片(30)、投影镜头(40)和如权利要求1-8任一项所述的RTIR光学元件组(20)；
    所述RTIR光学元件组(20)设置于所述照明光源(10)和投影镜头(40)之间，用于接收所述照明光源(10)出射的照明光束，并且对所述照明光束进行光路转换，以使所述照明光束入射至所述DMD芯片(30)，以及接收所述DMD芯片(30)根据所述照明光束输出的投影光束，并且对所述投影光束进行光路转换后出射至投影镜头(40)；
    所述照明光源(10)出射的照明光束与所述RTIR光学元件组(20)出射的投影光束光轴平行或者重合，所述RTIR光学元件组(20)、照明光源(10)和投影镜头(40)呈直线型排列。
  10. 根据权利要求9所述的投影系统，其特征在于，
    所述照明光源(10)邻近所述第一光学元件(21)的第一表面(P1)；
    所述DMD芯片(30)邻近设置于所述第二光学元件(22)的第五表面(P5)；
    所述投影镜头(40)邻近所述第二光学元件(22)的第六表面(P6)。
PCT/CN2018/088976 2017-12-01 2018-05-30 一种rtir光学元件组及其投影系统 WO2019104970A1 (zh)

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