WO2020215782A1 - 镜头组件及具有其的光学系统和头戴设备 - Google Patents

镜头组件及具有其的光学系统和头戴设备 Download PDF

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Publication number
WO2020215782A1
WO2020215782A1 PCT/CN2019/129186 CN2019129186W WO2020215782A1 WO 2020215782 A1 WO2020215782 A1 WO 2020215782A1 CN 2019129186 W CN2019129186 W CN 2019129186W WO 2020215782 A1 WO2020215782 A1 WO 2020215782A1
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Prior art keywords
polarized light
polarizer
phase retarder
lens assembly
light
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PCT/CN2019/129186
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English (en)
French (fr)
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翟睿智
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歌尔股份有限公司
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Publication of WO2020215782A1 publication Critical patent/WO2020215782A1/zh

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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
    • G02B27/01—Head-up displays
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses

Definitions

  • the present invention relates to the field of optical imaging technology, in particular to a lens assembly, an optical system and a head-mounted device having the same.
  • Virtual reality technology is a technology that uses a computer to generate a simulated environment to immerse users in the environment.
  • the optical system of virtual reality (Virtual Reality, VR) glasses is usually realized by a single lens or a combination of multiple lenses.
  • the reflected light will be generated due to the lens surface, and the reflected light will form a ghost after passing through the optical system and entering the human eye, thus affecting the use of VR glasses by the user.
  • the present invention provides a lens assembly, an optical system and a head-mounted device having the same, and aims to solve the problem that the light passing through the optical system of the VR glasses in the prior art is likely to produce ghost images and affect the use of the VR glasses by users.
  • the present invention proposes a lens assembly, which sequentially includes a polarizer, a phase retarder and a first lens group along the transmission direction of incident light,
  • the polarizer includes a first surface close to the object side and a second surface close to the image side;
  • the phase retarder includes a third surface close to the object side and a fourth surface close to the image side, and the phase retardation amount of the phase retarder is a quarter of the wavelength of the incident light;
  • the first lens group includes a fifth surface close to the object side and a sixth surface close to the image side;
  • the fifth surface is provided with a spectroscopic film
  • the incident light enters the polarizer from the first surface to become first linearly polarized light. After exiting from the second surface, the incident light enters the phase retarder through the third surface. The polarized light is transformed into the first circularly polarized light or the first elliptically polarized light through the phase retarder. After the first circularly polarized light or the first elliptically polarized light is emitted from the fourth surface, it is on the fifth surface. Transmission and reflection occur at the same time.
  • the first circularly polarized light or the first elliptically polarized light transmitted from the fifth surface exits the first mirror group from the sixth surface and reflects from the fifth surface After being reflected on the fifth surface, the first circularly polarized light or the first elliptically polarized light becomes the second circularly polarized light or the second elliptically polarized light, the second circularly polarized light or the After passing through the phase retarder, the second elliptically polarized light is intercepted by the polarizer.
  • the angle between the retardation axis of the phase retarder and the transmission direction of the polarizer is 45 degrees.
  • the delay axis is a fast axis or a slow axis.
  • the phase retarder is a quarter wave plate, and the center wavelength of the phase retarder is equal to the wavelength of the incident light.
  • the phase retarder is a quarter wave plate, and the angle between the fast axis or slow axis of the quarter wave plate and the transmission direction of the polarizer is 45 degrees; the quarter wave plate The center wavelength of is equal to the wavelength of the incident light.
  • the phase retarder is a phase retardation film, and the angle between the retardation axis of the phase retardation film and the transmission direction of the polarizer is 45 degrees.
  • the polarizer is a polarizer.
  • the present invention provides an optical system, the optical system includes the lens assembly as described in any one of the above embodiments; the optical system further includes a display unit, the display unit is provided in the polarizer One side away from the first lens group.
  • the present invention provides a head-mounted device that includes the optical system described in any of the foregoing embodiments.
  • the lens assembly includes a polarizer, a phase retarder, and a first lens group in order from the object side to the image side; the incident light becomes first linearly polarized light after passing through the polarizer, so After the linearly polarized light is set from the second surface, it enters the phase retarder from the third surface.
  • the first linearly polarized light After passing through the phase retarder, it is emitted from the fourth surface, and the first linearly polarized light is changed to the first circularly polarized light or the first elliptically polarized light, the first circularly polarized light or the first The elliptically polarized light is transmitted and reflected on the fifth surface, and the first circularly polarized light or the first elliptically polarized light transmitted from the fifth surface exits the first mirror group from the sixth surface , The first circularly polarized light or the first elliptically polarized light reflected from the fifth surface is reflected on the fifth surface, and is reflected from the first circularly polarized light or the first elliptically polarized light The second elliptically polarized light is changed to second circularly polarized light, wherein the rotation of the second circularly polarized light is opposite to that of the first circularly polar
  • the polarization direction of the second linearly polarized light is different from the transmission direction of the polarizer.
  • the second linearly polarized light is intercepted by the polarizer, so that the reflected light of the optical system cannot return to the first lens group and exit from the sixth surface, reducing the lens
  • the ghosting phenomenon caused by reflected light in the component solves the problem that the light passing through the optical system of the VR glasses in the prior art is prone to ghosting, which affects the use of the VR glasses by users.
  • Fig. 1 is a schematic diagram of the structure of the optical system of the present invention.
  • the terms “connected”, “fixed”, etc. should be understood in a broad sense, for example, “fixed” can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise.
  • “fixed” can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise.
  • fixed can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise.
  • the invention provides a lens assembly, an optical system and a head-mounted device with the lens assembly.
  • the lens assembly includes a polarizer 10, a phase retarder 20, and a first lens group 30 in sequence along the transmission direction of incident light.
  • the polarizer 10 includes a first surface 11 close to the object side and a second surface 12 close to the image side;
  • the phase retarder 20 includes a third surface 21 close to the object side and a fourth surface 22 close to the image side.
  • the phase retardation of the phase retarder 20 is a quarter of the wavelength of the incident light;
  • the first lens group 30 includes a fifth surface 31 close to the object side and a sixth surface 32 close to the image side; the fifth surface 31 is provided with a dichroic film, for example, the dichroic film can be provided in the form of coating or pasting. On the fifth surface 31;
  • the incident light enters the polarizer 10 from the first surface 11 to become first linearly polarized light, and after exiting from the second surface 12, enters the phase retarder 20 through the third surface 21,
  • the first linearly polarized light is transformed into first circularly polarized light or first elliptically polarized light through the phase retarder 20, and after the first circularly polarized light or the first elliptically polarized light exits from the fourth surface 22 ,
  • the transmission and reflection occur at the same time on the fifth surface 31, and the first circularly polarized light or the first elliptically polarized light transmitted from the fifth surface 31 is emitted from the sixth surface 32.
  • the lens assembly includes a polarizer 10, a phase retarder 20, and a first lens group 30 in order from the object side to the image side; the incident light becomes the first line after passing through the polarizer 10 Polarized light. After the linearly polarized light is set from the second surface 12, it enters the phase retarder 20 from the third surface 21.
  • the first linearly polarized light is emitted from the fourth surface 22 after passing through the phase retarder 20, and the first linearly polarized light is changed to the first circularly polarized light or the first elliptically polarized light, the The first circularly polarized light or the first elliptically polarized light is transmitted and reflected on the fifth surface 31, and the first circularly polarized light or the first elliptically polarized light transmitted from the fifth surface 31 is transmitted from The sixth surface 32 emits the first mirror group 30, and the first circularly polarized light or the first elliptically polarized light reflected from the fifth surface 31 is reflected on the fifth surface 31, and Change from the first circularly polarized light or the first elliptically polarized light to the second circularly polarized light or the second elliptically polarized light, and the rotation of the second circularly polarized light is the same as the first circularly polarized
  • the polarization direction of the second linearly polarized light and the polarization direction of the first linearly polarized light form an angle of 90 degrees.
  • the polarization direction of the second linearly polarized light and the transmission direction of the polarizer 10 form an angle of 90 degrees, so the second linearly polarized light is intercepted by the polarizer 10, so that the reflected light of the optical system cannot return to
  • the first lens group 30 is emitted from the sixth surface 32, reducing the ghosting phenomenon caused by reflected light in the lens assembly, and solving the problem that the light passing through the optical system of the VR glasses in the prior art is prone to ghosting , The problem that affects the use of VR glasses by users.
  • the spectroscopic film is a semi-reflective semi-permeable film, and the ratio of transmittance to reflectance of the semi-reflective semi-permeable film is 1:1. It is understood that the light splitting ratio of the spectroscopic film is not limited to this In other embodiments, the ratio of transmittance to reflectance of the spectroscopic film may also be 4:6 or 3:7.
  • the angle between the retardation axis of the phase retarder 20 and the transmission direction of the polarizer 10 is 45 degrees. Specifically, when the angle between the retardation axis of the phase retarder 20 and the transmission direction of the polarizer 10 is not 45 degrees, the linearly polarized light passing through the polarizer 10 passes through the phase retarder 20, From linearly polarized light to elliptically polarized light, the electric vectors in the elliptically polarized light whose vibration directions are perpendicular to each other have a fixed phase difference. The elliptically polarized light passes through the polarizer 10 again after being reflected.
  • the polarizer 10 Since the polarization direction of the partial electric vector of the elliptically polarized light and the direction of the polarizer 10 are not 45 degrees, the polarizer 10 cannot The elliptically polarized light is completely filtered, so that part of the reflected light is still generated and passes through the first lens group 30 to form ghost images, which affects the use of VR glasses by users.
  • the center wavelength of the phase retarder 20 is equal to the wavelength of the incident light. Specifically, when the center wavelength of the phase retarder 20 is equal to the wavelength of the incident light, the phase retarder 20 can produce a phase retardation of a quarter of the wavelength of the incident light for the incident light, thereby The linearly polarized light can be changed to the circularly polarized light.
  • the center wavelength of the phase retarder 20 is not equal to the wavelength of the incident light, the phase retardation generated by the incident light by the phase retarder 20 It is greater than or less than a quarter of the wavelength of the incident light, so that the linearly polarized light passing through the phase retarder 20 becomes elliptically polarized light.
  • the phase retarder 20 is a quarter-wave plate 23.
  • the lens assembly includes a polarizer 10 and a quarter-wave plate 23 in sequence along the transmission direction of the incident light.
  • the angle between the retardation axis of the quarter wave plate 23 and the transmission direction of the polarizer 10 is greater than or less than 45 degrees, the linearly polarized light is changed to elliptically polarized light after passing through the quarter wave plate 23 .
  • the angle between the retardation axis of the quarter wave plate 23 and the transmission direction of the polarizer 10 is 45 degrees, the light after passing through the polarizer 10 and the quarter wave plate 23 is circularly polarized light After the circularly polarized light is reflected by the fifth surface 31 of the first mirror group 30, the rotation of the circularly polarized light is reversed, and after passing through the quarter wave plate 23, it becomes the same as the incident light.
  • the linearly polarized light whose polarization direction is 90 degrees, since the polarization direction of the linearly polarized light is opposite to the transmission direction of the polarizer 10, the linearly polarized light is blocked to avoid being reflected again after passing through the polarizer 10 ghosts are formed.
  • the retardation axis of the quarter wave plate 23 is a fast axis or a slow axis.
  • the light vector direction with a fast propagation speed in the wave plate is the fast axis
  • the light vector direction with a slow propagation speed in the wave plate is the slow axis.
  • the phase retarder 20 is a phase retardation film, and the angle between the retardation axis of the phase retardation film and the transmission direction of the polarizer 10 is 45 degrees.
  • the phase retardation film can be used to adjust the polarization state of incident light, when the thickness of the phase retardation film is an integer multiple of a quarter wavelength of the incident light, and the retardation axis of the phase retardation film When the angle with the transmission direction of the polarizer 10 is 45 degrees, the linearly polarized light passing through the phase retardation film is changed to circularly polarized light; when the thickness of the phase retardation film is not a quarter of the incident light When an integer multiple of a wavelength or the angle between the retardation axis of the retardation film and the transmission direction of the polarizer 10 is not 45 degrees, the linearly polarized light passing through the retardation film is changed to elliptically polarized light.
  • the polarizer 10 is a polarizer 13, and the polarizer 13 is used to filter the light in the non-transmission direction of the polarizer 13, and only retain the light in the transmission direction of the polarizer 13 optical instrument. It can be understood that, in order to realize the function of the polarizer 10, the polarizer 10 is not limited to the polarizer 13, and in another embodiment, the polarizer 10 may be a light polarization controller.
  • the present invention also provides an optical system, which includes the lens assembly described in any of the foregoing embodiments.
  • the projection lens further includes a display unit 40 which is arranged on a side of the polarizer 10 away from the first lens group 30.
  • the present invention also provides a head-mounted device, the head-mounted device includes the optical system as described in any of the foregoing embodiments, the specific structure of the optical system refers to the foregoing embodiment, because the optical system adopts all the foregoing embodiments All the technical solutions, therefore, at least have all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not be repeated here.

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Abstract

一种镜头组件及具有其的光学系统和头戴设备，镜头组件沿入射光线的传输方向顺序包括偏振器（10）、相位延迟器（20）以及第一镜组（30），偏振器（10）包括第一表面（11）以及第二表面（12）；相位延迟器（20）包括第三表面（21）以及第四表面（22）；第一镜组（30）包括第五表面（31）以及第六表面（32）；入射光线从第一表面（11）进入偏振器（10），从第二表面（12）射出后，通过第三表面（21）进入相位延迟器（20），入射光线从第四表面（22）出射后，在第五表面（31）同时发生透射与反射，透射部分的光线从第六表面（32）射出第一镜组（30），反射部分的光线经过相位延迟器（20）后，被偏振器（10）拦截。从而经过光学系统的光线不容易产生鬼影，不会影响用户对VR眼镜的使用。

Description

镜头组件及具有其的光学系统和头戴设备 技术领域
本发明涉及光学成像技术领域，尤其涉及一种镜头组件及具有其的光学系统和头戴设备。
背景技术
虚拟现实技术是利用计算机生成一种模拟环境，使用户沉浸到该环境中技术，其中，虚拟现实(Virtual Reality，VR)眼镜的光学系统通常采用单片透镜或多片透镜组合的方式实现，入射光线在经过光学系统时，会由于透镜表面产生反射光线，反射光线经过光学系统并进入人眼后形成鬼影，从而影响用户对VR眼镜的使用。
发明内容
本发明提供一种镜头组件及具有其的光学系统和头戴设备，旨在解决现有技术中经过VR眼镜的光学系统的光线容易产生鬼影，影响用户对VR眼镜使用的问题。
为实现上述目的，本发明提出了一种镜头组件，所述镜头组件沿入射光线的传输方向顺序包括偏振器、相位延迟器以及第一镜组，
所述偏振器包括靠近物方的第一表面以及靠近像方的第二表面；
所述相位延迟器包括靠近物方的第三表面以及靠近像方的第四表面，所述相位延迟器的相位延迟量为所述入射光线波长的四分之一；
所述第一镜组包括靠近物方的第五表面以及靠近像方的第六表面；
所述第五表面设有分光膜；
所述入射光线从所述第一表面进入所述偏振器变为第一线偏振光，从所述第二表面射出后，通过所述第三表面进入所述相位延迟器，所述第一线偏振光通过所述相位延迟器变为第一圆偏振光或第一椭圆偏振光，所述第一圆偏振光或所述第一椭圆偏振光从第四表面出射后，在所述第五表面同时发生 透射与反射，从所述第五表面透射的所述第一圆偏振光或所述第一椭圆偏振光从所述第六表面射出所述第一镜组，从所述第五表面反射的所述第一圆偏振光或所述第一椭圆偏振光在所述第五表面反射后变为第二圆偏振光或所述第二椭圆偏振光，所述第二圆偏振光或所述第二椭圆偏振光经过所述相位延迟器后，被所述偏振器拦截。
可选地，所述相位延迟器的延迟轴与所述偏振器的透射方向夹角为45度。
可选地，所述延迟轴为快轴或慢轴。
可选地，所述相位延迟器为1/4波片，所述相位延迟器的中心波长与所述入射光线的波长相等。
可选地，所述相位延迟器为1/4波片，所述1/4波片的快轴或慢轴与所述偏振器的透射方向夹角为45度；所述1/4波片的中心波长与所述入射光线的波长相等。
可选地，所述相位延迟器为相位延迟膜，所述相位延迟膜的延迟轴与所述偏振器的透射方向夹角为45度。
可选地，所述偏振器为偏振片。
为实现上述目的，本发明提出一种光学系统，所述光学系统包括如上述任一项实施方式所述的镜头组件；所述光学系统还包括显示单元，所述显示单元设于所述偏振器远离所述第一镜组的一侧。
为实现上述目的，本发明提出一种头戴设备，所述头戴设备包括上述任一项实施方式所述的光学系统。
本发明提出的技术方案中，所述镜头组件从物方到像方顺序包括偏振器、相位延迟器以及第一镜组；入射光线在经过所述偏振器后变为第一线偏振光，所述线偏振光从第二表面设置后，从第三表面进入所述相位延迟器，由于所述相位延迟器的相位延迟量为入射光线波长的四分之一，所述第一线偏振光在经过相位延迟器后，从所述第四表面射出，并且所述第一线偏振光变更为第一圆偏振光或所述第一椭圆偏振光，所述第一圆偏振光或所述第一椭圆偏振光在所述第五表面发生透射与反射，从所述第五表面透射的所述第一圆偏振光或所述第一椭圆偏振光从所述第六表面射出所述第一镜组，从所述第五表面反射的所述第一圆偏振光或所述第一椭圆偏振光在所述第五表面发生反 射，并从所述第一圆偏振光或所述第一椭圆偏振光变更为第二圆偏振光所述第二椭圆偏振光，其中，所述第二圆偏振光的旋性与所述第一圆偏振光的旋性相反，所述第二椭圆偏振光的旋性与所述第一椭圆偏振光的旋性相反，所述第二圆偏振光或所述第二椭圆偏振光经过所述相位延迟器后变为第二线偏振光，所述第二线偏振光的偏振方向与所述第一线偏振光的偏振方向成90度夹角，所述第二线偏振光在经过所述偏振器时，由于所述第二线偏振光的偏振方向与所述偏振器的透射方向成90度夹角，因此所述第二线偏振光被所述偏振器拦截，从而使光学系统的反射光线无法重新回到所述第一镜组并从所述第六表面射出，减少所述镜头组件中由于反射光线产生的鬼影现象，解决了现有技术中经过VR眼镜的光学系统的光线容易产生鬼影，影响用户对VR眼镜使用的问题。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术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发明的一些实施例，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示出的结构获得其他的附图。
图1是本发明光学系统的结构示意图。
附图标号说明：
标号 名称 标号 名称
10 偏振器 22 第四表面
20 相位延迟器 31 第五表面
30 第一镜组 32 第六表面
11 第一表面 13 偏振片
12 第二表面 23 1/4波片
21 第三表面 40 显示单元
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明，本发明实施例中所有方向性指示(诸如上、下、左、右、前、后……)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本发明中如涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其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至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“连接”、“固定”等应做广义理解，例如，“固定”可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
另外，本发明各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
本发明提供一种镜头组件及具有其的光学系统和头戴设备。
请参照图1，所述镜头组件沿入射光线的传输方向顺序包括偏振器10、相位延迟器20以及第一镜组30，
所述偏振器10包括靠近物方的第一表面11以及靠近像方的第二表面12；
所述相位延迟器20包括靠近物方的第三表面21以及靠近像方的第四表 面22，所述相位延迟器20的相位延迟量为所述入射光线波长的四分之一；
所述第一镜组30包括靠近物方的第五表面31以及靠近像方的第六表面32；所述第五表面31设有分光膜，如分光膜可通过镀膜的形式或者贴膜的形式设置在第五表面31；
所述入射光线从所述第一表面11进入所述偏振器10变为第一线偏振光，从所述第二表面12射出后，通过所述第三表面21进入所述相位延迟器20，所述第一线偏振光通过所述相位延迟器20变为第一圆偏振光或第一椭圆偏振光，所述第一圆偏振光或所述第一椭圆偏振光从第四表面22出射后，在所述第五表面31同时发生透射与反射，从所述第五表面31透射的所述第一圆偏振光或所述第一椭圆偏振光从所述第六表面32射出所述第一镜组30，从所述第五表面31反射的所述第一圆偏振光或所述第一椭圆偏振光在所述第五表面31反射后变为第二圆偏振光或所述第二椭圆偏振光，所述第二圆偏振光或所述第二椭圆偏振光经过所述相位延迟器20后，被所述偏振器10拦截。
本发明提出的技术方案中，所述镜头组件从物方到像方顺序包括偏振器10、相位延迟器20以及第一镜组30；入射光线在经过所述偏振器10后变为第一线偏振光，所述线偏振光从第二表面12设置后，从第三表面21进入所述相位延迟器20，由于所述相位延迟器20的相位延迟量为入射光线波长的四分之一，所述第一线偏振光在经过相位延迟器20后，从所述第四表面22射出，并且所述第一线偏振光变更为第一圆偏振光或所述第一椭圆偏振光，所述第一圆偏振光或所述第一椭圆偏振光在所述第五表面31发生透射与反射，从所述第五表面31透射的所述第一圆偏振光或所述第一椭圆偏振光从所述第六表面32射出所述第一镜组30，从所述第五表面31反射的所述第一圆偏振光或所述第一椭圆偏振光在所述第五表面31发生反射，并从所述第一圆偏振光或所述第一椭圆偏振光变更为第二圆偏振光或所述第二椭圆偏振光，所述第二圆偏振光的旋性与所述第一圆偏振光的旋性相反，所述第二椭圆偏振光的旋性与所述第一椭圆偏振光的旋性相反，所述第二圆偏振光或所述第二椭圆偏振光经过所述相位延迟器20后变为第二线偏振光，所述第二线偏振光的偏振方向与所述第一线偏振光的偏振方向成90度夹角，所述第二线偏振光在经过所述偏振器10时，由于所述第二线偏振光的偏振方向与所述偏振器10的透射方向成90度夹角，因此所述第二线偏振光被所述偏振器10拦截，从而使光学系统 的反射光线无法重新回到所述第一镜组30并从所述第六表面32射出，减少所述镜头组件中由于反射光线产生的鬼影现象，解决了现有技术中经过VR眼镜的光学系统的光线容易产生鬼影，影响用户对VR眼镜使用的问题。
优选实施方式中，所述分光膜为半反半透膜，所述半反半透膜的透射率与反射率的比例为1:1，可以理解的是，所述分光膜分光比例不限于此，于其他实施方式中，所述分光膜的透射率与反射率的比例还可以为4:6或3:7。
在一些可选的实施方式中，所述相位延迟器20的延迟轴与所述偏振器10的透射方向夹角为45度。具体的，当所述相位延迟器20的延迟轴与所述偏振器10的透射方向夹角不为45度时，通过所述偏振器10的线偏振光在经过所述相位延迟器20后，从线偏振光变为椭圆偏振光，所述椭圆偏振光中的振动方向互相垂直的电矢量存在固定的相位差。所述椭圆偏振光在反射后再次经过所述偏振器10，由于所述椭圆偏振光的部分电矢量的偏振方向与所述偏振器10的方向不为45度，因此所述偏振器10无法对所述椭圆偏振光进行全部过滤，从而仍会产生部分反射光线并经过所述第一镜组30，形成鬼影，影响用户对VR眼镜的使用。
在一些可选的实施方式中，所述相位延迟器20的中心波长与所述入射光线的波长相等。具体的，所述相位延迟器20的中心波长与所述入射光线的波长相等时，所述相位延迟器20能为所述入射光线产生所述入射光线波长的四分之一的相位延迟，从而能够使所述线偏振光变为所述圆偏振光，当所述相位延迟器20的中心波长与所述入射光线的波长不相等时，所述相位延迟器20所述入射光线产生的相位延迟大于或小于所述入射光线波长的四分之一，从而使经过所述相位延迟器20的线偏振光变为椭圆偏振光。
在一些可选的实施方式中，所述相位延迟器20为1/4波片23，具体的，所述镜头组件沿所述入射光线的传输方向顺序包括偏振器10、1/4波片23以及第一镜组30，其中所述1/4波片23的中心波长与所述入射光线的波长相等，所述1/4波片23的延迟轴与所述偏振器10的透射方向夹角为45度。当所述1/4波片23的延迟轴与所述偏振器10的透射方向夹角大于或小于45度时， 所述线偏振光经过所述1/4波片23后变更为椭圆偏振光。当所述1/4波片23的延迟轴与所述偏振器10的透射方向夹角为45度时，经过所述偏振器10与所述1/4波片23后的光为圆偏振光，该圆偏振光在经过所述第一镜组30的所述第五表面31反射后，该圆偏振光的旋性反向，并且在经过所述1/4波片23后变为与入射光线偏振方向夹角成90度的线偏振光，由于线偏振光的偏振方向与所述偏振器10的透射方向相反，因此线偏振光均被阻挡，避免透过所述偏振器10后再次反射形成鬼影。
优选实施方式中，所述1/4波片23的延迟轴为快轴或慢轴。具体的，波片中传播速度快的光矢量方向为快轴，波片中传播速度慢的光矢量方向为慢轴。当所述线偏振光的偏振方向与所述1/4波片23的快轴或慢轴夹角成45度时，所述线偏振光在经过所述1/4波片23后变更为圆偏振光。
优选实施方式中，所述相位延迟器20为相位延迟膜，所述相位延迟膜的延迟轴与所述偏振器10的透射方向夹角为45度。具体的，所述相位延迟膜能够用于调整入射光线的偏振态，当所述相位延迟膜的厚度为所述入射光线的四分之一波长的整数倍，并且所述相位延迟膜的延迟轴与所述偏振器10的透射方向夹角为45度时，经过所述相位延迟膜的线偏振光变更为圆偏振光；当所述相位延迟膜的厚度不为所述入射光线的四分之一波长的整数倍，或所述相位延迟膜的延迟轴与所述偏振器10的透射方向夹角不为45度时，经过所述相位延迟膜的线偏振光变更为椭圆偏振光。
在一些可选的实施方式中，所述偏振器10为偏振片13，所述偏振片13用于过滤所述偏振片13非透射方向的光，只保留所述偏振片13透射方向的光的光学器件。可以理解的是，为了实现所述偏振器10的功能，所述偏振器10不限于偏振片13，于另一实施例中，所述偏振器10可以为光偏振控制器。
为实现上述上述目的，本发明还提出一种光学系统，所述光学系统包括如上述任一项实施方式所述的镜头组件。另外，所述投影镜头还包括显示单元40，所述显示单元40设于所述偏振器10远离所述第一镜组30的一侧。
本发明还提出一种头戴设备，所述头戴设备包括如上述任一实施方式所述的光学系统，该光学系统的具体结构参照上述实施例，由于该光学系统采用了上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (9)

  1. 一种镜头组件，其特征在于，所述镜头组件沿入射光线的传输方向顺序包括偏振器、相位延迟器以及第一镜组，
    所述偏振器包括靠近物方的第一表面以及靠近像方的第二表面；
    所述相位延迟器包括靠近物方的第三表面以及靠近像方的第四表面，所述相位延迟器的相位延迟量为所述入射光线波长的四分之一；
    所述第一镜组包括靠近物方的第五表面以及靠近像方的第六表面；
    所述第五表面设有分光膜；
    所述入射光线从所述第一表面进入所述偏振器变为第一线偏振光，从所述第二表面射出后，通过所述第三表面进入所述相位延迟器，所述第一线偏振光通过所述相位延迟器变为第一圆偏振光或第一椭圆偏振光，所述第一圆偏振光或所述第一椭圆偏振光从第四表面出射后，在所述第五表面同时发生透射与反射，从所述第五表面透射的所述第一圆偏振光或所述第一椭圆偏振光从所述第六表面射出所述第一镜组，从所述第五表面反射的所述第一圆偏振光或所述第一椭圆偏振光在所述第五表面反射后变为第二圆偏振光或所述第二椭圆偏振光，所述第二圆偏振光或所述第二椭圆偏振光经过所述相位延迟器后，被所述偏振器拦截。
  2. 如权利要求1所述的镜头组件，其特征在于，所述相位延迟器的延迟轴与所述偏振器的透射方向夹角为45度。
  3. 如权利要求1所述的镜头组件，其特征在于，所述相位延迟器的中心波长与所述入射光线的波长相等。
  4. 如权利要求1所述的镜头组件，其特征在于，所述相位延迟器为1/4波片，所述1/4波片的延迟轴与所述偏振器的透射方向夹角为45度；所述1/4波片的中心波长与所述入射光线的波长相等。
  5. 如权利要求4所述的镜头组件，其特征在于，所述延迟轴为所述1/4 波片的快轴或慢轴。
  6. 如权利要求1所述的镜头组件，其特征在于，所述相位延迟器为相位延迟膜，所述相位延迟膜的延迟轴与所述偏振器的透射方向夹角为45度。
  7. 如权利要求1-6中任一项所述的镜头组件，其特征在于，所述偏振器为偏振片。
  8. 一种光学系统，其特征在于，所述光学系统包括如权利要求1-7任一项所述的镜头组件；所述光学系统还包括显示单元，所述显示单元设于所述偏振器远离所述第一镜组的一侧。
  9. 一种头戴设备，其特征在于，所述头戴设备包括如权利要求8所述的光学系统。
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