WO2019079996A1 - 目镜及头戴式电子设备 - Google Patents

目镜及头戴式电子设备

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Publication number
WO2019079996A1
WO2019079996A1 PCT/CN2017/107633 CN2017107633W WO2019079996A1 WO 2019079996 A1 WO2019079996 A1 WO 2019079996A1 CN 2017107633 W CN2017107633 W CN 2017107633W WO 2019079996 A1 WO2019079996 A1 WO 2019079996A1
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WO
WIPO (PCT)
Prior art keywords
lens
eyepiece
focal length
object side
image side
Prior art date
Application number
PCT/CN2017/107633
Other languages
English (en)
French (fr)
Inventor
何芳
Original Assignee
深圳市柔宇科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市柔宇科技有限公司 filed Critical 深圳市柔宇科技有限公司
Priority to CN201780092196.3A priority Critical patent/CN110753870B/zh
Priority to PCT/CN2017/107633 priority patent/WO2019079996A1/zh
Publication of WO2019079996A1 publication Critical patent/WO2019079996A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • 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

Definitions

  • the present invention relates to optical imaging technology, and more particularly to an eyepiece and a head mounted electronic device.
  • head-mounted electronic devices are widely used as people's requirements for scene experience are getting higher and higher.
  • the head-mounted electronic device due to the unreasonable design of the eyepiece of the head-mounted electronic device, the head-mounted electronic device has problems such as large size and small field of view, which limits the development of the head-mounted electronic device.
  • Embodiments of the present invention provide an eyepiece and a head mounted electronic device.
  • the present invention provides an eyepiece for a head mounted electronic device including a first lens having a positive refractive power, a second lens having a negative refractive power, and a first having a positive refractive power, from the image side to the object side. a three lens, a fourth lens having a positive refractive power, and a fifth lens having a negative refractive power;
  • the eyepiece satisfies the following relationship:
  • f 1 is the focal length of the first lens
  • f 2 is the focal length of the second lens
  • f 3 is the focal length of the third lens
  • f 4 is the focal length of the fourth lens
  • f 5 is the The focal length of the fifth lens, f w , is the total focal length of the eyepiece.
  • the eyepiece of the embodiment of the present invention can effectively shorten the length of the eyepiece by using a combination of five lenses, thereby making the head-mounted electronic device compact, lightweight, and capable of satisfying a large angle of view.
  • a head mounted electronic device provided by the present invention includes the eyepiece and the display terminal of the above embodiment, and the display terminal is located on the object side of the fifth lens.
  • the head-mounted electronic device can effectively shorten the length of the eyepiece by using a combination of five lenses, thereby making the head-mounted electronic device compact, lightweight, and capable of satisfying a large angle of view.
  • FIG. 1 is a schematic structural view of an eyepiece according to Embodiment 1 of the present invention.
  • FIG 2 is an MTF diagram of an eyepiece according to Embodiment 1 of the present invention.
  • Fig. 3 is a field curvature diagram of the eyepiece of the first embodiment of the present invention.
  • Fig. 4 is a distortion diagram of the eyepiece according to the first embodiment of the present invention.
  • Fig. 5 is a schematic structural view of an eyepiece according to a second embodiment of the present invention.
  • Fig. 6 is an MTF diagram of an eyepiece according to a second embodiment of the present invention.
  • Fig. 7 is a field curvature diagram of the eyepiece of the second embodiment of the present invention.
  • Figure 8 is a distortion diagram of the eyepiece of the second embodiment of the present invention.
  • Figure 9 is a schematic view showing the structure of an eyepiece according to a third embodiment of the present invention.
  • Figure 10 is an MTF diagram of an eyepiece according to a third embodiment of the present invention.
  • Figure 11 is a field curvature diagram of an eyepiece according to a third embodiment of the present invention.
  • Figure 12 is a distortion diagram of the eyepiece of the third embodiment of the present invention.
  • the head mounted electronic device 100 the eyepiece 10, the first lens 11, the second lens 13, the third lens 15, the fourth lens 17, the fifth lens 19, and the display terminal 20.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of "a plurality” is two or more unless specifically and specifically defined otherwise.
  • connection should be understood broadly, for example, it may be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, which can be the internal communication of two elements or the interaction of two elements.
  • intermediate medium can be the internal communication of two elements or the interaction of two elements.
  • an eyepiece 10 of an embodiment of the present invention is used in a head mounted electronic device 100.
  • the eyepiece 10 includes, in order from the image side to the object side, a first lens 11 having a positive refractive power, a second lens 13 having a negative refractive power, a third lens 15 having a positive refractive power, a fourth lens 17 having a positive refractive power, and A fifth lens 19 having a negative refractive power.
  • the eyepiece 10 satisfies the following relationship:
  • f 1 is the focal length of the first lens 11
  • f 2 is the focal length of the second lens 13
  • f 3 is the focal length of the third lens 15
  • f 4 is the focal length of the fourth lens 17
  • f 5 is the focal length of the fifth lens 19
  • f w is the total focal length of the eyepiece 10.
  • the eyepiece 10 of the embodiment of the present invention can effectively shorten the length of the eyepiece 10 by using a combination of five lenses, thereby making the head mounted electronic device 100 smaller, lighter, and capable of satisfying a large angle of view.
  • conditional expression (1) indicates that the eyepiece 10 is configured by the focal length f 1 of the first lens 11. If the focal length f 1 of the first lens 11 is too small (f 1 /f w ⁇ 0.7), it is difficult to correct the aberration of the eyepiece 10, causing the eyepiece 10 to be unclear, and also causing the first lens 11 to be too curved, increasing the number The thickness of a lens 11 is disadvantageous for miniaturization of the eyepiece 10. If the focal length f 1 of the first lens 11 is too large (f 1 /f w > 2), it is necessary to configure other small focal length optical components to meet the focal length requirement of the eyepiece 10, which will increase the number of lenses of the eyepiece 10, Conducive to the miniaturization of the eyepiece 10.
  • the conditional expression (2) indicates that the eyepiece 10 is configured by the focal length f 2 of the second lens 13.
  • the conditional expression (3) indicates that the eyepiece 10 is configured by the focal length f 3 of the third lens 15.
  • the conditional expression (4) indicates that the eyepiece 10 is configured by the focal length f 4 of the fourth lens 17.
  • the conditional expression (5) indicates that the eyepiece 10 is configured by the focal length f 5 of the fifth lens 19.
  • the second lens 13 is a focal length f 4
  • a fifth lens 19 f 5 eyepiece 10 is configured so that the angle of view of eyepiece 10 large and small distortion, diopter adjustment is large, and a shorter length, thereby achieving miniaturization of the electronic device 100 of the head mounted.
  • the material of the eyepiece meets the following requirements:
  • Vd1, Vd2, Vd3, Vd4, Vd5 The Abbe numbers of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens on the d line are respectively shown.
  • the d line refers to a specific wavelength value.
  • FIG. 1 can be represented as a light path diagram of light passing through the eyepiece 10.
  • the eyepiece 10 includes a stop 12 that is located on the image side of the first lens 11.
  • the aperture 12 can limit the size of the imaged scene.
  • the aperture 12 may include a field stop and an aperture stop, the field stop is a hole for limiting the field of view of the imaged object, and the aperture stop is a hole that limits the size of the incident beam, and the aperture stop reduces stray light and improves The quality of the image.
  • the image side surface S1 of the first lens 11 is convex, and the object side surface S2 of the first lens 11 is convex.
  • the image side surface S1 of the first lens 11 and the object side surface S2 of the first lens 11 are both aspherical.
  • the first lens 11 facilitates correcting aberrations of the eyepiece 10, helping to shorten the length of the eyepiece 10.
  • the first lens 11 has a positive refractive power to facilitate correction of aberrations.
  • the image side surface S1 of the first lens 11 and the object side surface S2 of the first lens 11 are both convex.
  • the ratio of the focal length of the first lens 11 to the total focal length of the eyepiece 12 is greater than 0.7 and less than 2, thereby facilitating the small size of the eyepiece 10. Chemical.
  • the image side surface S1 of the first lens 11 and the object side surface S2 of the first lens 1 are both aspherical, the image quality of the eyepiece 11 can be improved, and distortion can be reduced.
  • the aspherical surface shape is determined by the following conditional expression:
  • X is the longitudinal distance between any point on the aspheric surface and the surface apex
  • r is the height from any point on the aspheric surface to the optical axis
  • c is the curvature of the vertex
  • k is the cone constant
  • Ai is the correction coefficient of the i-th order of the aspheric surface.
  • the image side surface S3 of the second lens 13 is a concave surface
  • the object side surface S4 of the second lens is a convex surface. Both the image side surface S3 of the second lens 13 and the object side surface S4 of the second lens are aspherical.
  • the second lens 13 facilitates correcting the aberration of the eyepiece 10, helping to shorten the length of the eyepiece 10.
  • the second lens 13 has a negative refractive power to facilitate correction of the aberration of the eyepiece 10.
  • the image side surface S3 of the second lens 13 is a concave surface and the object side surface S4 of the second lens is convex.
  • the absolute value of the ratio of the focal length of the second lens 13 to the total focal length of the eyepiece 12 is greater than 0.4 and less than 1.2, thereby facilitating the eyepiece. 10 miniaturization.
  • Both the image side surface S3 of the second lens 13 and the object side surface S4 of the second lens 13 are aspherical, which can improve the image quality of the eyepiece 11 and reduce distortion.
  • the image side surface S5 of the third lens 15 is a concave surface
  • the object side surface S6 of the third lens 15 is a convex surface. Both the image side surface S5 of the third lens 15 and the object side surface S6 of the third lens are aspherical.
  • the third lens 15 facilitates correcting the aberration of the eyepiece 10, helping to shorten the length of the eyepiece 10.
  • the third lens 15 has a positive refractive power to facilitate correction of the aberration of the eyepiece 10.
  • Image side of the third lens 15 The surface S5 is a concave surface and the object side surface S6 of the second lens is convex.
  • the ratio of the focal length of the third lens 15 to the total focal length of the eyepiece 12 is greater than 6 and less than 9, thereby facilitating miniaturization of the eyepiece 10.
  • Both the image side surface S5 of the third lens 15 and the object side surface S6 of the third lens 15 are aspherical, which can improve the image quality of the eyepiece 11 and reduce distortion.
  • the image side surface S7 of the fourth lens 17 is convex, and the object side surface S8 of the fourth lens 17 is concave. Both the image side surface S7 of the fourth lens 17 and the object side surface S8 of the fourth lens 17 are aspherical.
  • the fourth lens 17 facilitates correcting aberrations of the eyepiece 10, helping to shorten the length of the eyepiece 10.
  • the fourth lens 17 has a positive refractive power to facilitate correction of the aberration of the eyepiece 10.
  • the image side surface S7 of the fourth lens 17 is convex and the object side surface S8 of the fourth lens 17 is concave.
  • the ratio of the focal length of the fourth lens 17 to the total focal length of the eyepiece 12 is greater than 0.5 and less than 3, thereby facilitating the eyepiece 10. miniaturization.
  • Both the image side surface S7 of the fourth lens 17 and the object side surface S8 of the fourth lens 17 are aspherical, which can improve the image quality of the eyepiece 11 and reduce distortion.
  • the image side surface S9 of the fifth lens 19 is a convex surface
  • the object side surface S10 of the fifth lens 19 is a concave surface.
  • the image side surface S9 of the fifth lens 19 and the object side surface S10 of the fifth lens 19 are both aspherical.
  • the fifth lens 19 facilitates correcting aberrations of the eyepiece 10, helping to shorten the length of the eyepiece 10.
  • the fifth lens 19 has a negative refractive power to facilitate correction of the aberration of the eyepiece 10.
  • the image side surface S9 of the fifth lens 19 is a concave surface and the object side surface S10 of the fifth lens is convex.
  • the absolute value of the ratio of the focal length of the fifth lens 19 to the total focal length of the eyepiece 12 is greater than 7 and less than 9, thereby facilitating the eyepiece. 10 miniaturization.
  • Both the image side surface S9 of the fifth lens 19 and the object side surface S10 of the fifth lens 19 are aspherical, which can improve the image quality of the eyepiece 11 and reduce distortion.
  • the field of view of the eyepiece 10 is greater than 54 degrees. As such, this allows the eyepiece 10 to meet the market demand for a large field of view.
  • the larger the field of view the larger the field of view seen.
  • the angle of view of the eyepiece 10 is large, and the design of the eyepiece 10 of the present embodiment can be downsized while securing a large angle of view.
  • the eyepiece 10 has a diopter greater than 1000 degrees. In this way, the eyepiece 10 is satisfied to meet the needs of users who are nearly 1000 degrees.
  • D represents the diopter
  • d represents the shortest distance from the fifth lens 19 in the optical axis direction to the display terminal 20
  • fw is the total focal length of the eyepiece.
  • the eyepiece 10 of the present embodiment has the feature of being square telecentric, and the present embodiment does not change the angle of view when the diopter is adjusted. It can be understood that, like the square telecentric path, the aperture stop is placed on the object focal plane of the eyepiece 10, and the main ray of the object is parallel to the convergence center of the main ray of the optical axis at infinity. Like Fang Yuan The function of the heart-light path is to eliminate the measurement error introduced by the image focus adjustment.
  • the percentage of distortion values of the eyepiece 10 is less than 2.3. As such, the low distortion rate makes the imaging of the eyepiece 10 clear.
  • the length of the eyepiece 10 is less than 30 mm. In this way, the miniaturization of the eyepiece 10 can be achieved in this way.
  • the eyepiece 10 has an entrance pupil distance of 15 mm and an entrance pupil diameter of 6 mm.
  • the eyepiece 10 can acquire a large eye movement range, and the user can conveniently view the image formed by the eyepiece 10, which is beneficial to improve the user experience.
  • the head mounted electronic device 100 of the embodiment of the present invention includes an eyepiece 10 and a display terminal 20.
  • the display terminal 20 is located on the object side of the fifth lens 19.
  • the display terminal 20 includes a display screen and a cover glass on the display screen.
  • the cover glass is located on the object side of the fifth lens, the image side surface S11 of the cover glass is opposed to the fifth lens 19, and the object side surface S12 of the cover glass is opposed to the display screen.
  • the display screen is, for example, a liquid crystal display, an OLED display, etc., and the display terminal 20 can display a picture, and the light emitted by the display terminal 20 passes through the eyepiece and reaches the image side image.
  • the human terminal can observe the display terminal 20 on the image side of the aperture 12.
  • the display screen has a size of 0.7 inches and a resolution of 1920 ⁇ 1080, which can meet the needs of use within a resolution of 4 million pixels.
  • the size of the head mounted electronic device 100 can be reduced, and the user can observe a high definition image.
  • the head mounted electronic device 100 in order to form a larger image after passing through the eyepiece 10, the head mounted electronic device 100 generally adopts a larger display screen, such as a display screen of more than 3 inches, which may make the size of the head mounted electronic device 100 too large.
  • the head mounted electronic device 100 is disadvantageous for carrying.
  • the head mounted electronic device 100 of the present embodiment adopts a display screen having a size of 0.7 inches, thereby greatly reducing the size of the head mounted electronic device 100, and at the same time, since the resolution of the display screen is 1920 ⁇ 1080, the display The picture can still form a larger and sharper image after being enlarged by the eyepiece 10.
  • FIG. 2 is a schematic diagram of an imaging MTF of the head mounted electronic device 100 according to Embodiment 1 of the present invention.
  • the horizontal axis in the imaging MTF diagram represents spatial resolution in lp/mm (number of pairs per millimeter) and the vertical axis represents the MTF value, which is the percentage of imaging quality that reaches the physical condition, from 0 to 1.
  • the MTF values corresponding to the different spatial rates of the 0 degree field of view angle, the 20 degree field of view angle and the 44 degree field of view angle are respectively extracted.
  • T is the meridional plane
  • S is the sagittal plane
  • the MTF corresponding to T and S is the same at the 0 degree field of view.
  • the value of the MTF of the present embodiment at 80 Ip/mm is 0.4 or more, so that the feature of the embodiment of the present invention having high resolution can be obtained.
  • FIG. 3 is a schematic diagram of a field curvature curve of the head mounted electronic device 100 according to the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing a distortion curve of the head mounted electronic device 100 according to the first embodiment of the present invention.
  • T is the meridional field curvature, that is, the field curvature curve corresponding to the meridional plane
  • S is the sagittal field curvature, that is, the field curvature curve corresponding to the sagittal plane
  • the difference between the meridional field curvature and the sagittal field curvature is astigmatism.
  • Field curvature and astigmatism affect the aberration of the off-axis field of view light, and the difference is too large to seriously affect the imaging of the system's off-axis light. quality. Distortion variables in the distortion graph do not affect the sharpness of the image and only cause image distortion.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the eyepiece satisfies the conditions of Table 1 below:
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the eyepiece satisfies the conditions of Table 2 below:
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the eyepiece satisfies the conditions of Table 3 below:
  • the first feature "on” or “under” the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them.
  • the first feature "above”, “above” and “above” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

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  • Optics & Photonics (AREA)
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Abstract

一种目镜(10)和头戴式电子设备(100)，目镜(10)从像侧到物侧依次包括具有正屈折力的第一透镜(11)、具有负屈折力的第二透镜(13)、具有正屈折力的第三透镜(15)、具有正屈折力的第四透镜(17)和具有负屈折力的第五透镜(19)。目镜(10)满足以下关系式：0.7<f 1/f w<2；0.4<|f 2/f w|<1.2；6<f 3/f w<9；0.5<f 4/f w<3；7<|f 5/f w|<9。其中f 1为第一透镜(11)的焦距，f 2为第二透镜(13)的焦距，f 3为第三透镜(15)的焦距，f 4为第四透镜(17)的焦距，f 5为第五透镜(19)的焦距，f w为目镜(10)的总焦距。

Description

目镜及头戴式电子设备 技术领域
本发明涉及光学成像技术，特别涉及一种目镜和头戴式电子设备。
背景技术
目前，随着人们对场景体验的要求越来越高，头戴式电子设备被广泛使用。在相关技术中，由于头戴式电子设备的目镜设计不合理，导致头戴式电子设备存在着体积大、视场角小等问题，限制了头戴式电子设备的发展。
发明内容
本发明的实施例提供一种目镜及头戴式电子设备。
本发明提供一种目镜，用于头戴式电子设备，所述目镜从像侧到物侧依次包括具有正屈折力的第一透镜、具有负屈折力的第二透镜、具有正屈折力的第三透镜、具有正屈折力的第四透镜、具有负屈折力的第五透镜；
所述目镜满足下列关系式：
(1)0.7<f1/fw<2；
(2)0.4<|f2/fw|<1.2；
(3)6<f3/fw<9；
(4)0.5<f4/fw<3；
(5)7<|f5/fw|<9；
其中f1为所述第一透镜的焦距，f2为所述第二透镜的焦距，f3为所述第三透镜的焦距，f4为所述第四透镜的焦距，f5为所述第五透镜的焦距，fw为所述目镜的总焦距。
本发明实施方式的目镜利用五个透镜的结合，可有效缩短目镜的长度，从而使得头戴式电子设备的小型化、轻量化及能满足大视场角的需求。
本发明提供的一种头戴式电子设备包括上述实施方式的目镜和显示终端，显示终端位于第五透镜的物侧。
本发明实施方式的头戴式电子设备，利用五个透镜的结合，可有效缩短目镜的长度，从而使得头戴式电子设备的小型化、轻量化及能满足大视场角的需求。
本发明的实施方式的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实施方式的实践了解到。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是本发明实施例一的目镜的结构示意图。
图2是本发明实施例一的目镜的MTF图。
图3是本发明实施例一的目镜的场曲图。
图4是本发明实施例一的目镜的畸变图。
图5是本发明实施例二的目镜的结构示意图。
图6是本发明实施例二的目镜的MTF图。
图7是本发明实施例二的目镜的场曲图。
图8是本发明实施例二的目镜的畸变图。
图9是本发明实施例三的目镜的结构示意图。
图10是本发明实施例三的目镜的MTF图。
图11是本发明实施例三的目镜的场曲图。
图12是本发明实施例三的目镜的畸变图。
主要元件符号附图说明：
头戴式电子设备100、目镜10、第一透镜11、第二透镜13、第三透镜15、第四透镜17、第五透镜19、显示终端20。
具体实施方式
下面详细描述本发明的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，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所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、 “连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接。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。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。
请参阅图1，本发明实施方式的目镜10用于头戴式电子设备100。目镜10从像侧到物侧依次包括具有正屈折力的第一透镜11、具有负屈折力的第二透镜13、具有正屈折力的第三透镜15、具有正屈折力的第四透镜17和具有负屈折力的第五透镜19。目镜10满足以下关系式：
(1)0.7<f1/fw<2；
(2)0.4<|f2/fw|<1.2；
(3)6<f3/fw<9；
(4)0.5<f4/fw<3；
(5)7<|f5/fw|<9；
其中f1为第一透镜11的焦距，f2为第二透镜13的焦距，f3为第三透镜15的焦距，f4为第四透镜17的焦距，f5为第五透镜19的焦距，fw为目镜10的总焦距。
本发明实施方式的目镜10利用五个透镜的结合，可有效缩短目镜10的长度，从而使得头戴式电子设备100的小型化、轻量化及能满足大视场角的需求。
需要指出的是，条件式(1)表明了通过第一透镜11的焦距f1来配置目镜10。如果第一透镜11的焦距f1过小(f1/fw<0.7)，则难于纠正目镜10的像差，导致目镜10成像不清晰，同时也会导致第一透镜11过于弯曲，增加第一透镜11的厚度，不利于目镜10的小型化。如果第一透镜11的焦距f1过大(f1/fw>2)，则需要配置其他小焦距的光学元件以满足目镜10的焦距要求，这样将会增加目镜10的透镜的数量，不利于目镜10小型化。
条件式(2)表明通过第二透镜13的焦距f2来配置目镜10。条件式(3)表明通过第三透镜15的焦距f3来配置目镜10。条件式(4)表明通过第四透镜17的焦距f4来配置目镜10。条件式(5)表明通过第五透镜19的焦距f5来配置目镜10。综上所述，目镜10通过第一透镜11的焦距f1、第二透镜13的焦距f2、第三透镜15的焦距f3、第四透镜17的焦距f4、第五透镜19的焦距f5来配置目镜10，以使得目镜10的视场角大、畸变率小、屈光度调节大，并且长度较短，从而实现头戴式电子设备100的小型化。
具体的，目镜的材料满足如下要求：
Nd1>1.49，Nd2>1.58，Nd3>1.53，Nd4>1.49，Nd5>1.58；其中，Nd1、Nd2、Nd3、Nd4、Nd5分别表示第一透镜、第二透镜、第三透镜、第四透镜和第五透镜在d线的折射率。
Vd1>45，Vd2>21，Vd3>45，Vd4>45，Vd5>21；其中，Vd1、Vd2、Vd3、Vd4、Vd5 分别表示第一透镜、第二透镜、第三透镜、第四透镜和第五透镜在d线的阿贝数。
可以理解，d线是指特定的波长值。
可以理解，图1可表示为光线通过目镜10的光线路径图。
在某些实施方式中，目镜10包括光阑12，光阑12位于第一透镜11的像侧。
如此，光阑12可以限制成像景物的面积大小。
具体的，光阑12的物侧表面S0与第一透镜11相对。光阑12可包括视场光阑和孔径光阑，视场光阑为限制成像景物的视场所用的孔，而孔径光阑为限制入射光束大小的孔，孔径光阑可减少杂散光，提高成像的质量。
在某些实施方式中，第一透镜11的像侧表面S1为凸面，第一透镜11的物侧表面S2为凸面。第一透镜11的像侧表面S1和第一透镜11的物侧表面S2均为非球面。
如此，第一透镜11有利于纠正目镜10的像差，有助于缩短目镜10的长度。
可以理解，第一透镜11具有正屈折力有利于修正像差。第一透镜11的像侧表面S1及第一透镜11的物侧表面S2均为凸面有利于第一透镜11焦距与目镜12的总焦距的比值大于0.7并且小于2，从而有利于目镜10的小型化。同时，由于第一透镜11的像侧表面S1和第一透镜1的物侧表面S2均为非球面，这样可以提高目镜11的成像质量，减少畸变。
具体的，非球面的面型由以下条件式决定：
Figure PCTCN2017107633-appb-000001
其中，X是非球面上任一点与表面顶点的纵向距离，r是非球面上任一点到光轴的高度，c是顶点曲率，k是锥形常数，Ai是非球面第i-th阶的修正系数。
在某些实施方式中，第二透镜13的像侧表面S3为凹面，第二透镜的物侧表面S4为凸面。第二透镜13的像侧表面S3和第二透镜的物侧表面S4均为非球面。
如此，第二透镜13有利于纠正目镜10的像差，有助于缩短目镜10的长度。
可以理解，第二透镜13具有负屈折力有利于修正目镜10的像差。第二透镜13的像侧表面S3为凹面及第二透镜的物侧表面S4为凸面有利于第二透镜13焦距与目镜12的总焦距的比值的绝对值大于0.4并且小于1.2，从而有利于目镜10的小型化。第二透镜13的像侧表面S3和第二透镜13的物侧表面S4均为非球面，这样可以提高目镜11的成像质量，减少畸变。
在某些实施方式中，第三透镜15的像侧表面S5为凹面，第三透镜15的物侧表面S6为凸面。第三透镜15的像侧表面S5和第三透镜的物侧表面S6均为非球面。
如此，第三透镜15有利于纠正目镜10的像差，有助于缩短目镜10的长度。
可以理解，第三透镜15具有正屈折力有利于修正目镜10的像差。第三透镜15的像侧 表面S5为凹面及第二透镜的物侧表面S6为凸面有利于第三透镜15焦距与目镜12的总焦距的比值大于6并且小于9，从而有利于目镜10的小型化。第三透镜15的像侧表面S5和第三透镜15的物侧表面S6均为非球面，这样可以提高目镜11的成像质量，减少畸变。
在某些实施方式中，第四透镜17的像侧表面S7为凸面，第四透镜17的物侧表面S8为凹面。第四透镜17的像侧表面S7和第四透镜17的物侧表面S8均为非球面。
如此，第四透镜17有利于纠正目镜10的像差，有助于缩短目镜10的长度。
可以理解，第四透镜17具有正屈折力有利于修正目镜10的像差。第四透镜17的像侧表面S7为凸面及第四透镜17的物侧表面S8为凹面有利于第四透镜17焦距与目镜12的总焦距的比值大于0.5并且小于3，从而有利于目镜10的小型化。第四透镜17的像侧表面S7和第四透镜17的物侧表面S8均为非球面，这样可以提高目镜11的成像质量，减少畸变。
在某些实施方式中，第五透镜19的像侧表面S9为凸面，第五透镜19的物侧表面S10为凹面。第五透镜19的像侧表面S9和第五透镜19的物侧表面S10均为非球面。
如此，第五透镜19有利于纠正目镜10的像差，有助于缩短目镜10的长度。
可以理解，第五透镜19具有负屈折力有利于修正目镜10的像差。第五透镜19的像侧表面S9为凹面及第五透镜的物侧表面S10为凸面有利于第五透镜19焦距与目镜12的总焦距的比值的绝对值大于7并且小于9，从而有利于目镜10的小型化。第五透镜19的像侧表面S9和第五透镜19的物侧表面S10均为非球面，这样可以提高目镜11的成像质量，减少畸变。
在某些实施方式中，目镜10的视场角大于54度。如此，这样使得目镜10可满足大视场角的市场需求。
具体的，视场角越大，看到的视野就越大。本实施方式的目镜10在保证成像质量的情况下，目镜10的视场角较大，并且本实施方式的目镜10的设计在保证大视场角的情况下，能够实现小型化。
在某些实施方式中，目镜10的屈光度大于1000度。如此，这样使得目镜10满足近视为1000度用户的使用需求。
具体的，由屈光度计算公式：D＝d*1000/(fw)2，可得出的本发明的屈光度调节在1000度以上。其中：D表示屈光度，d表示沿光轴方向的第五透镜19到显示终端20的最短距离，fw为目镜的总焦距。
可以理解，从图1可以看出，本实施方式的目镜10具有像方远心的特点，本实施方式在屈光度调节时不会出现视场角的变化。可以理解，像方远心光路是将孔径光阑放置在目镜10的物方焦平面上，物方主光线平行于光轴主光线的会聚中心位于像方无限远。像方远 心光路作用为：可以消除像方调焦不准引入的测量误差。
请参阅图4，在某些实施方式中，目镜10的畸变值的百分数小于2.3。如此，低畸变率使得目镜10的成像清晰。
在某些实施方式中，目镜10的长度小于30mm。如此，这样可实现目镜10的小型化。
在某些实施方式中，目镜10的入瞳距为15mm，入瞳直径为6mm。
如此，目镜10在小型化、成像清晰的情况下，目镜10可以获取较大的眼动范围，用户可以方便地观看目镜10所形成的图像，有利于提高用户体验。
本发明实施方式的头戴式电子设备100包括目镜10和显示终端20。显示终端20位于第五透镜19的物侧。
具体的，本实施方式中，显示终端20包括显示屏和位于显示屏上的盖板玻璃。在本发明实施方式中，盖板玻璃位于第五透镜的物侧，盖板玻璃的像侧表面S11与第五透镜19相对，盖板玻璃的物侧表面S12与显示屏相对。显示屏例如为液晶显示屏、OLED显示屏等，显示终端20可以显示画面，显示终端20发出的光线经过目镜后到达像侧成像。人眼可在光阑12的像侧观察显示终端20。
在某些实施方式中，显示屏的尺寸为0.7寸，分辨率为1920×1080，能够满足分辨率为400万像素以内的使用需要。
如此，可以减少头戴式电子设备100的尺寸，及用户可以观察到高清晰度的图像。
具体的，头戴式电子设备100为了使得经过目镜10后形成较大的图像，一般采用较大的显示屏，比如3寸以上的显示屏，这样会使得头戴式电子设备100的尺寸过大，从而使得头戴式电子设备100不利于携带。本实施方式的头戴式电子设备100采用尺寸为0.7寸的显示屏，从而极大地减小了头戴式电子设备100的尺寸，与此同时，由于显示屏的分辨率为1920×1080，显示的画面经过目镜10的放大后仍能形成较大和较清晰的图像。
图2是本发明实施例一的头戴式电子设备100的成像MTF示意图。成像MTF示意图中的横轴代表空间分辨率，单位是lp/mm(每毫米的线对数)，纵轴代表MTF值，即成像质量达到实物状况的百分比，从0到1。图中分别汇出了0度视场角下、20度视场角下和44度视场角下不同空间分别率对应的MTF值。其中，T为子午面，S为弧矢面，0度视场角下T和S对应的MTF一致。从图中可以看出，本实施方式的MTF在80Ip/mm处的值都为0.4以上，从而可以得出本发明实施方式具有高分辨率的特征。
图3是本发明实施例一的头戴式电子设备100的场曲曲线示意图。图4是本发明实施例一的头戴式电子设备100的畸变曲线示意图。场曲曲线图中T为子午场曲，即子午面对应的场曲曲线，S为弧矢场曲，即弧矢面对应的场曲曲线，子午场曲和弧矢场曲的差为象散，场曲和象散影响着轴外视场光线的像差，差值过大会严重影响到系统轴外光线的成像 质量。畸变曲线图中的畸变量不会影响图像的清晰度，仅会引起图像变形。
实施例一：
请参阅图1-4，在实施例一中，目镜满足以下表1的条件：
Figure PCTCN2017107633-appb-000002
表1
实施例二：
请参阅图5-8，在实施例二中，目镜满足以下表2的条件：
Figure PCTCN2017107633-appb-000003
表2
实施例三：
请参阅图9-12，在实施例三中，目镜满足以下表3的条件：
Figure PCTCN2017107633-appb-000004
表3
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
在本说明书的描述中，参考术语“一个实施方式”、“一些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”等的描述意指结合实施方式或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
尽管已经示出和描述了本发明的实施方式，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施方式进行多种变化、修改、替换和变型， 本发明的范围由权利要求及其等同物限定。

Claims (15)

  1. 一种目镜，用于头戴式电子设备，其特征在于，所述目镜从像侧到物侧依次包括：
    具有正屈折力的第一透镜；
    具有负屈折力的第二透镜；
    具有正屈折力的第三透镜；
    具有正屈折力的第四透镜；和
    具有负屈折力的第五透镜；
    所述目镜满足下列关系式：
    (1)0.7<f1/fw<2；
    (2)0.4<|f2/fw|<1.2；
    (3)6<f3/fw<9；
    (4)0.5<f4/fw<3；
    (5)7<|f5/fw|<9；
    其中f1为所述第一透镜的焦距，f2为所述第二透镜的焦距，f3为所述第三透镜的焦距，f4为所述第四透镜的焦距，f5为所述第五透镜的焦距，fw为所述目镜的总焦距。
  2. 如权利要求1所述的目镜，其特征在于，所述目镜包括光阑，所述光阑位于所述第一透镜的像侧。
  3. 如权利要求1所述的目镜，其特征在于，所述第一透镜的像侧表面为凸面，所述第一透镜的物侧表面为凸面，所述第一透镜的像侧表面和所述第一透镜的物侧表面均为非球面。
  4. 如权利要求1所述的目镜，其特征在于，所述第二透镜的像侧表面为凹面，所述第二透镜的物侧表面为凸面，所述第二透镜的像侧表面和所述第二透镜的物侧表面均为非球面。
  5. 如权利要求1所述的目镜，其特征在于，所述第三透镜的像侧表面为凹面，所述第三透镜的物侧表面为凸面，所述第三透镜的像侧表面和所述第三透镜的物侧表面均为非球面。
  6. 如权利要求1所述的目镜，其特征在于，所述第四透镜的像侧表面为凸面，所述第 四透镜的物侧表面为凹面，所述第四透镜的像侧表面和所述第四透镜的物侧表面均为非球面。
  7. 如权利要求1所述的目镜，其特征在于，所述第五透镜的像侧表面为凸面，所述第五透镜的物侧表面为凹面，所述第五透镜的像侧表面和所述第五透镜的物侧表面均为非球面。
  8. 如权利要求1所述的目镜，其特征在于，所述目镜的视场角大于54度。
  9. 如权利要求1所述的目镜，其特征在于，所述目镜的屈光度大于1000度。
  10. 如权利要求1所述的目镜，其特征在于，所述目镜的畸变值的百分数小于2.3。
  11. 如权利要求1所述的目镜，其特征在于，所述目镜的长度小于30mm。
  12. 如权利要求1所述的目镜，其特征在于，所述目镜的入瞳距为15mm，入瞳直径为6mm。
  13. 如权利要求1所述的目镜，其特征在于，所述目镜的材料满足如下要求：
    Nd1>1.49，Nd2>1.58，Nd3>1.53，Nd4>1.49，Nd5>1.58；Vd1>45，Vd2>21，Vd3>45，Vd4>45，Vd5>21；
    其中，Nd1、Nd2、Nd3、Nd4、Nd5分别表示所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜和所述第五透镜在d线的折射率，Vd1、Vd2、Vd3、Vd4、Vd5分别表示所述第一透镜、所述第二透镜、所述第三透镜、所述第四透镜和所述第五透镜在d线的阿贝数。
  14. 一种头戴式电子设备，其特征在于，包括：
    权利要求1-13任意一项所述的目镜；和
    显示终端，所述显示终端位于所述第五透镜的物侧。
  15. 如权利要求14所述的头戴式电子设备，其特征在于，所述显示终端包括显示屏，所述显示屏的尺寸为0.7寸，所述显示屏的分辨率为1920×1080。
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WO2021097851A1 (zh) * 2019-11-22 2021-05-27 天津欧菲光电有限公司 光学成像系统、取像装置及电子设备
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CN111694147A (zh) * 2020-06-24 2020-09-22 深圳珑璟光电技术有限公司 一种目镜镜头及目镜光学系统
CN111694147B (zh) * 2020-06-24 2023-12-08 深圳珑璟光电科技有限公司 一种目镜镜头及目镜光学系统
CN112764221A (zh) * 2020-12-31 2021-05-07 深圳纳德光学有限公司 一种大视场角的目镜光学系统及头戴显示装置
CN112764221B (zh) * 2020-12-31 2024-05-28 深圳纳德光学有限公司 一种大视场角的目镜光学系统及头戴显示装置

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