WO2020133619A1 - 一种用于移动终端的外接镜头 - Google Patents

一种用于移动终端的外接镜头 Download PDF

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Publication number
WO2020133619A1
WO2020133619A1 PCT/CN2019/072901 CN2019072901W WO2020133619A1 WO 2020133619 A1 WO2020133619 A1 WO 2020133619A1 CN 2019072901 W CN2019072901 W CN 2019072901W WO 2020133619 A1 WO2020133619 A1 WO 2020133619A1
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WIPO (PCT)
Prior art keywords
lens
external
lens group
cylindrical
mobile terminal
Prior art date
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Ceased
Application number
PCT/CN2019/072901
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English (en)
French (fr)
Inventor
吴伟
李�杰
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Guangdong Sirui Optical Co Ltd
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Guangdong Sirui Optical Co Ltd
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Publication date
Application filed by Guangdong Sirui Optical Co Ltd filed Critical Guangdong Sirui Optical Co Ltd
Priority to US16/477,183 priority Critical patent/US20210356706A1/en
Priority to EP19745959.7A priority patent/EP3699665A1/en
Publication of WO2020133619A1 publication Critical patent/WO2020133619A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/06—Simple or compound lenses with non-spherical faces with cylindrical or toric faces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/003—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having two lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • 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
    • G02B27/0075—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. increasing, the depth of field or depth of focus
    • 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
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/56—Accessories
    • G03B17/565—Optical accessories, e.g. converters for close-up photography, tele-convertors, wide-angle convertors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • H04M1/027—Details of the structure or mounting of specific components for a display module assembly including magnifying means

Definitions

  • the invention relates to the technical field of photography accessories for mobile terminals, and in particular to an external lens used for mobile terminals.
  • the common display ratio of mobile terminals such as mobile phones and tablet computers on the market is 16:9, and the aspect ratio of the video or short film obtained by direct shooting is also 16:9. It is impossible to directly obtain video works with a wide aspect ratio. If you want to create a wide-frame ratio video work, the existing technology usually uses software to crop the frame to convert the frame. However, the cropped video file has a smaller horizontal field of view angle, and it will result in a reduction of the vertical field of view content and clarity. , The picture quality is damaged and other issues affect the video quality.
  • the technical problem to be solved by the present invention is to overcome the problems in the prior art that when using a mobile terminal such as a mobile phone to shoot and produce a wide-frame ratio video, the horizontal field of view angle is smaller, the vertical field angle content is reduced, the definition is reduced, and the image quality is affected. Damage and other defects, thereby providing an external lens for a mobile terminal.
  • An external lens for a mobile terminal includes a first lens group and a second lens group composed of cylindrical lenses arranged from the object side to the image side, and the X-direction optical focus of the first lens group When the degree is less than zero, the power of the second lens group in the X direction is greater than zero; the power of the external lens in the Y direction is zero.
  • two cylindrical lenses are provided, which are a first lens and a second lens; the first lens group includes the first lens, and the second lens group includes the second lens.
  • the first lens is a flat concave cylindrical lens of negative power; and/or, the second lens is a meniscus cylindrical lens of positive power.
  • the cylindrical lens is set as three, which are a first lens, a second lens and a third lens; the first lens group includes the first lens, the second lens group includes a cemented lens The second lens and the third lens.
  • the first lens group and the second lens group satisfy the following conditions:
  • f 1 is the focal length in the X direction of the first lens group
  • f 2 is the focal length in the X direction of the second lens group.
  • the first lens group is made of materials with low refractive index and high Abbe number
  • the second lens group is made of materials with high refractive index and low Abbe number
  • the first lens group meets the following conditions:
  • Nd is the refractive index of d and Vd is the Abbe number;
  • the second lens group meets the following conditions:
  • Nd is the refractive index of d light
  • Vd is the Abbe number
  • the cylindrical lens has a square axisymmetric structure, and the maximum length of the cylindrical lens in the external lens is ⁇ 26 mm, and the width is ⁇ 24 mm.
  • the external lens includes a cylindrical lens body, the cylindrical lens is disposed on the lens body, the lens body has a TTL ⁇ 17.0mm, and a maximum outer diameter ⁇ 38mm.
  • the mobile terminal is a mobile phone
  • the external lens is used in conjunction with the rear camera of the mobile phone.
  • it includes an installation structure installed on the mobile phone and a lens body detachably installed on the installation structure; the at least two cylindrical lenses are provided on the lens body.
  • An external lens for a mobile terminal includes a first lens group and a second lens group composed of cylindrical lenses arranged from the object side to the image side, the first lens group in the X direction
  • the optical power is less than zero, the optical power in the X direction of the second lens group is greater than zero; the optical power in the Y direction of the external lens is zero.
  • the horizontal field angle of the mobile terminal camera can be increased without changing the vertical field angle;
  • the first lens group is used to adjust the light entering the external lens, the main function is Increase the angle of light entering in the horizontal direction;
  • the second lens group is used to adjust the light to ensure that the light entering the camera of the mobile terminal after being emitted from the external lens is basically the same as the incident light when the mobile terminal shoots itself, such as no vignetting, clear The degree is consistent with the mobile terminal itself.
  • professional post software such as FILMIC PRO
  • it can realize the function of shooting wide format ratio movie video on the mobile terminal; and there is no need to crop or less content, shooting wide format ratio video while ensuring the imaging quality of the video.
  • the first lens and the second lens satisfy the following conditions: -0.85 ⁇ f 1 /f 2 ⁇ -0.70, where f 1 is the focal length of the first lens in the X direction, f 2 is the focal length of the second lens in the X direction.
  • the horizontal field angle of the mobile terminal camera can be increased by 33% and the vertical field angle does not change; when the external lens is used with a mobile terminal with a shooting ratio of 16:9,
  • professional post-processing software such as FILMIC PRO
  • FILMIC PRO the function of shooting movie video with a frame ratio of 2.39:1 on the mobile terminal without cropping, ensuring the horizontal field of view angle and imaging quality of the video.
  • FIG. 1 is a schematic diagram of the optical structure of an external lens for a mobile terminal provided in the first embodiment of the present invention
  • FIG. 2 is a vertical axis chromatic aberration diagram of an embodiment of an external lens for a mobile terminal provided by the present invention
  • FIG. 3 is a relative illuminance diagram in a vertical direction of an embodiment of an external lens for a mobile terminal provided by the present invention
  • FIG. 4 is a relative illuminance diagram in the horizontal direction of an embodiment of an external lens for a mobile terminal provided by the present invention
  • FIG. 5 is a vertical MTF diagram of an embodiment of an external lens for a mobile terminal provided by the present invention.
  • FIG. 6 is a horizontal MTF diagram of an embodiment of an external lens for a mobile terminal provided by the present invention.
  • a Airy disk, b: 0.4861 ⁇ m, c: 0.5460 ⁇ m, d: 0.4360 ⁇ m, e: 0.5876 ⁇ m, f: 0.6563 ⁇ m.
  • FIG. 1 shows an embodiment of an external lens for a mobile terminal provided by the present invention.
  • the external lens uses 2 cylindrical lenses and adopts an optical design of 2 lenses in 2 groups, which includes sequentially setting the first lens group and the second lens group from the object side to the image side.
  • the first lens group includes the first lens 1 and the second lens group includes the second lens 2.
  • the first lens 1 is a flat concave cylindrical mirror with negative refractive power.
  • the second lens 2 is a meniscus cylindrical mirror with positive power.
  • the Y-direction power of the first lens group and the second lens group are both 0.
  • the focal length in the X direction satisfies the following relationship:
  • f 1 is the focal length in the X direction of the first lens group
  • f 2 is the focal length in the X direction of the second lens group
  • f 1 is the focal length in the X (sagittal) direction of the first lens
  • f 2 is the focal length in the X (sagittal) direction of the second lens
  • the external lens for mobile terminal provided by the present invention is used in conjunction with a mobile terminal camera with a shooting ratio of 16:9.
  • the horizontal field of view angle can be increased by about 33% while the vertical field angle is unchanged.
  • the first lens group is used to adjust the light entering the external lens, the main function is to increase the angle of the light entering the horizontal direction, that is, the horizontal field angle in this embodiment is increased by 33%; the second lens group is used to adjust the light
  • the light that enters the camera of the mobile terminal after being emitted from the external lens is basically the same as the incident light when the mobile terminal shoots itself, for example, there is no vignetting, the clarity is consistent with the mobile terminal itself.
  • the mobile terminal still uses the 16:9 ratio for storage after compressing the horizontal field of view, so it is necessary to use professional post-processing software such as post-processing software FILMIC PRO to restore the compressed content and correct the distortion, so that users can use their own shooting ratio of 16:9 Of mobile terminals shoot wide-screen movie videos with an aspect ratio of 2.39:1 without cropping, while ensuring the imaging quality of the video.
  • professional post-processing software such as post-processing software FILMIC PRO to restore the compressed content and correct the distortion
  • the increase in the horizontal field of view of the external lens for mobile terminals provided by the present invention is not limited to 33%.
  • the compressed content can also be restored through post-production software, and the distortion is corrected, and a wide-screen 2.39:1 is produced by cutting Screen movie video; compared with the prior art, the horizontal field of view angle is increased, the vertical field of view is less cropped, the crop loss is less, and the wide-frame ratio is better than the video while ensuring the image quality of the video.
  • the external lens for mobile terminal provided by the present invention is not limited to shooting video with an aspect ratio of 2.39:1, and the horizontal field angle can also be adjusted by adjusting the focal length relationship between the first lens group and the second lens group in the X direction, thereby Change the shooting ratio to adapt to different application scenarios.
  • an external lens can increase the horizontal field of view angle by about 5%, which allows users to use a mobile terminal with a 16:9 ratio to shoot wide-screen movie video with a frame ratio of 1.85:1 without cropping, while ensuring video Image quality.
  • the external lens for mobile terminal provided by the present invention is not limited to use with mobile terminal cameras with a shooting ratio of 16:9.
  • the same principle can still be adopted by expanding the horizontal field of view angle. Achieve wide-format shooting than video, without cropping or less cropping content, and ensure the horizontal angle of view of the video and imaging quality.
  • the first lens 1 is a flat concave cylindrical lens
  • the second lens 2 is a meniscus cylindrical lens, which can reduce the structural size on the basis of satisfying optical performances such as power, clarity, and color reproduction, to ensure the overall external lens. Portability.
  • the first lens 1 is not limited to a plano-concave cylindrical lens, and may be other types of negative power cylindrical lenses.
  • the second lens 2 is not limited to the meniscus cylindrical lens in this embodiment, but may be a biconvex, plano-convex cylindrical lens of positive power.
  • the first lens 1 in the first lens group is made of a material with a low refractive index and a high Abbe number.
  • the second lens 2 in the second lens group is made of a material with a high refractive index and a low Abbe number.
  • Abbe number Vd>50 is called high Abbe number material
  • Vd ⁇ 40 is called low Abbe number material.
  • the d light refractive index Nd and Abbe number Vd of the first lens 1 satisfy the following conditions: 1.48 ⁇ Nd ⁇ 1.74, 52 ⁇ Vd ⁇ 72.
  • the d light refractive index Nd and Abbe number Vd of the second lens 2 satisfy the following conditions: 1.7 ⁇ Nd ⁇ 1.95, 16 ⁇ Vd ⁇ 30.
  • the first lens 1 and the second lens 2 are both cylindrical lenses.
  • the cylindrical lens is a square axis-symmetric lens, and the front projection perpendicular to the action direction of the lens is a square.
  • This embodiment The length of the largest cylindrical lens in the middle is less than 26mm and the width is less than 24mm to ensure the size of the final product, thus ensuring the portability of the external lens.
  • the first lens 1 and the second lens 2 are assembled in a cylindrical housing. After the cylindrical housing, the first lens 1 and the second lens 2 are assembled, they are collectively referred to as the lens body.
  • the TTL (Total Track Length) of the lens body Less than 17mm, the maximum outer diameter is less than 38mm, in order to ensure the compactness and portability of the external lens, convenient for users to carry.
  • the external lens used in the mobile terminal provided by the present invention is not limited to the optical structure of the two cylindrical lenses of the first lens 1 and the second lens 2, and more than two cylindrical lenses may be used.
  • an optical design of 3 lenses and 2 groups may be used, including a first lens group and a second lens group arranged in order from the object side to the image side.
  • the first lens group includes a first lens
  • the second lens group includes a cemented second lens and a third lens.
  • the first lens, the second lens, and the third lens are all cylindrical lenses, and the power of the external lens in the Y direction is zero, the power of the first lens group in the X direction is less than zero, and the power of the second lens group in the X direction
  • the optical power is greater than zero.
  • the external lens provided by the present invention can also use more lens combinations, which can meet the design requirements of the first lens group and the second lens group in the above embodiments, but based on consideration of weight, volume, cost and other factors, comprehensive measurement Two cylindrical lenses are the preferred embodiment.
  • the mobile terminal is a mobile phone
  • the external lens is used in conjunction with the rear camera of the mobile phone.
  • the external lens includes a mounting structure mounted on a mobile phone, and the lens body is detachably mounted on the mounting structure.
  • the mounting structure is a mobile phone case adapted to the mobile phone, and the lens body is mounted on the mobile phone case through a screw structure.
  • the lens body can be detachably matched with the mobile phone case through linear sliding buckles, rotating buckles, and magnetic attraction.
  • the installation structure may also be a shell structure that partially cooperates with the mobile phone or wraps one end of the mobile phone, or an elastic clip that is clamped to the mobile phone.
  • the optical design and size design of the external lens for mobile terminals provided by the present invention are not only optimized and controlled for the size of the CMOS chip of Apple mobile phones, but also optimized and controlled for mainstream Android mobile phones (such as Huawei, Samsung, Huawei, OPPO, VIVO, etc.) , So that it can be applied to multiple mobile phones, ensuring the compatibility of the external lens.
  • the external lens can be used for the front camera of a mobile phone, and also for mobile terminals such as tablet computers and sports cameras.
  • the invention provides a specific optical design example of an external lens used for a mobile terminal.
  • the specific parameters are as follows:
  • FIG. 2 is a vertical axis chromatic aberration diagram. From the figure, it can be seen that through strict chromatic aberration correction, the vertical axis chromatic aberration of the external lens is ensured to be ⁇ 1.5 ⁇ m, so as to ensure the color reproduction of the video taken by the mobile phone after the mobile phone is connected to the external lens provided by the present invention.
  • Figures 3 and 4 are relative illuminance diagrams. It can be seen from the figure that by optimizing the optical structure parameters, the relative optical illuminance of the outermost edge of the external lens in the horizontal direction is >58% and the relative optical illuminance of the outermost edge of the vertical direction is >75%. Therefore, the brightness balance of the video captured by the mobile phone after the mobile phone is connected with the external lens provided by the invention is ensured.
  • Figures 5 and 6 are MTF image quality maps. As can be seen from the horizontal and vertical MTF resolution simulation images, strict correction of various optical aberrations ensures that the external lens has excellent resolution pixel quality, thus ensuring that the mobile phone is connected to the external After the external lens provided by the invention, the definition of the video captured by the mobile phone.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)
  • Telephone Set Structure (AREA)
  • Studio Devices (AREA)

Abstract

一种用于移动终端的外接镜头，包括从物方到像方设置的由柱面镜片组成的第一镜片组和第二镜片组，第一镜片组X方向的光焦度小于零，第二镜片组X方向的光焦度大于零；外接镜头Y方向的光焦度为零。通过利用柱面镜特有的光学特性，可将移动终端摄像头水平视场角度增加且垂直视场角度不改变；通过专业后期软件(FILMIC PRO)处理，能够实现移动终端拍摄宽画幅比电影视频的功能；而且无需裁剪或裁剪内容少，拍摄宽画幅比视频的同时保证视频的成像质量。

Description

一种用于移动终端的外接镜头 技术领域
本发明涉及移动终端摄影配件技术领域，具体涉及一种用于移动终端的外接镜头。
背景技术
随着移动互联网技术的发展，手机已经成为日常必需品之一。近几年，手机等移动终端的相机水平不断提高，功能素质越来越强大，手机正在逐渐取代普通数码相机成为大众首选的拍照工具。伴随着手机视频拍摄功能的越来越强大，越来越多的用户开始尝试使用手机去拍摄专业的短片、微电影等宽画幅比(如1.85:1、2.39:1)的影视作品。
然而目前市面上手机、平板电脑等移动终端常见的显示比例为16:9，直接拍摄得到的视频或短片的画幅比也为16：9，无法直接获取宽画幅比的视频作品。如需制作宽画幅比视频作品，现有技术通常采用软件裁剪画幅的方式进行画幅转换，然而经过裁剪后的视频文件水平视场角度较少，并且会导致垂直视场的内容减少、清晰度降低、画质受损等问题，影响视频质量。
因此如何在通过手机等移动终端拍摄宽画幅比视频时保证视频质量和视场角度成为目前需要解决的技术问题。
发明内容
因此，本发明要解决的技术问题在于克服现有技术中的采用手机等移动终端拍摄制作宽画幅比视频时出现水平视场角度较小、垂直视场角度内容减少、清晰度降低、画质受损等缺陷，从而提供一种用于移动终端的外接镜头。
本发明提供的一种用于移动终端的外接镜头，包括从物方到像方设置的由柱面镜片组成的第一镜片组和第二镜片组，所述第一镜片组X方向的光焦度小于零，所述第二镜片组X方向的光焦度大于零；所述外接镜头Y方向的光焦度为零。
可选的，所述柱面镜片设置为两枚，为第一透镜和第二透镜；所述第一镜片组包括所述第一透镜，所述第二镜片组包括所述第二透镜。
可选的，所述第一透镜为负光焦度的平凹柱面镜片；和/或，所述第二透镜为正光焦度的弯月形柱面镜片。
可选的，所述柱面镜片设置为三枚，为第一透镜、第二透镜和第三透镜；所述第一镜片组包括所述第一透镜，所述第二镜片组包括胶合的所述第二透镜和所述第三透镜。
可选的，所述第一镜片组和所述第二镜片组满足以下条件：
-0.85<f 1/f 2<-0.70，
其中f 1为所述第一镜片组X方向焦距，f 2为第二镜片组X方向焦距。
可选的，所述第一镜片组采用低折射率、高阿贝数材料制成；所述第二镜片组采用高折射率、低阿贝数材料制成。
可选的，所述第一镜片组满足以下条件：
1.48<Nd<1.74,52<Vd<72；
Nd为d光折射率，Vd为阿贝数；和/或，
所述第二镜片组满足以下条件：
1.7<Nd<1.95,16<Vd<30；
Nd为d光折射率，Vd为阿贝数。
可选的，所述柱面镜片为方形轴对称结构，所述外接镜头中最大柱面镜片长度<26mm,宽度<24mm。
可选的，所述外接镜头包括圆柱形的镜头本体，所述柱面镜片设置于所述镜头本体，所述镜头本体TTL<17.0mm，最大外径<38mm。
可选的，所述移动终端为手机，所述外接镜头配合所述手机的后置摄像头使用。
可选的，包括安装于所述手机的安装结构以及可拆卸安装于所述安装结构的镜头本体；所述至少两个柱面镜片设置于所述镜头本体。
本发明技术方案，具有如下优点：
1.本发明提供的一种用于移动终端的外接镜头，包括从物方到像方设置的由柱面镜片组成的第一镜片组和第二镜片组，所述第一镜片组X方向的光焦度小于零，所述第二镜片组X方向的光焦度大于零；所述外接镜头Y方向的光焦度为零。如此设计，通过利用柱面镜特有的光学特性，可将移动终端摄像头水平视场角度增加且垂直视场角度不改变；第一镜片组用于对进入该外接镜头的光线进行调节，主要作用是使水平方向进入的光线角度增大；第二镜片组用于调整光线，保证从外接镜头射出后进入移动终端摄像头的光线与移动终端自身拍摄时的射入光线基本一致，例如无暗角、清晰度和移动终端自身一致。通过专业后期软件(如FILMIC PRO)处理，能够实现移动终端拍摄宽画幅比电影视频的功能；而且无需裁剪或裁剪内容少，拍摄宽画幅比视频的同时保证视频的成像质量。
2.本发明提供的一种用于移动终端的外接镜头，第一透镜和第二透镜满足以下条件：-0.85<f 1/f 2<-0.70，其中f 1为第一透镜X方向焦距，f 2为第二透镜X方向焦距。通过采纳上述焦距比的第一透镜和第二透镜，可使移动终端摄像 头水平视场角度增加33％且垂直视场角度不改变；该外接镜头配合拍摄比例为16:9的移动终端使用时，通过专业后期软件(如FILMIC PRO)处理，能够实现移动终端拍摄画幅比值为2.39:1的电影视频的功能，而且无需裁剪，保证视频的水平视场角度以及成像质量。
附图说明
为了更清楚地说明本发明具体实施方式或现有技术中的技术方案，下面将对具体实施方式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，下面描述中的附图是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明的第一种实施方式中提供的一种用于移动终端的外接镜头的光学结构示意图；
图2为本发明提供的一种用于移动终端的外接镜头实施例的垂轴色差图；
图3为本发明提供的一种用于移动终端的外接镜头实施例垂直方向的相对照度图；
图4为本发明提供的一种用于移动终端的外接镜头实施例水平方向的相对照度图；
图5为本发明提供的一种用于移动终端的外接镜头实施例垂直方向的MTF图；
图6为本发明提供的一种用于移动终端的外接镜头实施例水平方向的MTF图。
附图标记说明：
1-第一透镜、2-第二透镜。
a：艾里斑、b：0.4861μm、c：0.5460μm、d：0.4360μm、e：0.5876μm、f：0.6563μm.
具体实施方式
下面将结合附图对本发明的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，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做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。
图1示出了本发明提供的一种用于移动终端的外接镜头实施例。
如图1所示，该外接镜头使用2枚柱面镜片，采用2片2组的光学设计，包括从物方到像方依次设置第一镜片组和第二镜片组。第一镜片组包括第一透镜1，第二镜片组包括第二透镜2。其中，第一透镜1为负光焦度的平凹柱面镜。第二透镜2为正光焦度的弯月形柱面镜。第一镜片组和第二镜片组的Y方向光焦度均为0。X方向的焦距满足如下关系：
-0.85<f 1/f 2<-0.70，
其中，f 1为第一镜片组X方向焦距，f 2为第二镜片组X方向焦距
本实施例中，f 1为第一透镜X(弧矢)方向焦距，f 2为第二透镜X(弧矢)方向焦距。
本发明提供的用于移动终端的外接镜头配合拍摄比例为16:9的移动终端摄像头使用。通过利用柱面镜特有的光学特性，可实现拍摄水平视场角度增加约33％同时垂直视场角度不变。第一镜片组用于对进入该外接镜头的光线进行调节，主要作用是使水平方向进入的光线角度增大，即本实施例中水平视场角度增加33％；第二镜片组用于调整光线，保证从外接镜头射出后进入移动终端摄像头的光线与移动终端自身拍摄时的射入光线基本一致，例如无暗角、清晰 度和移动终端自身一致。
但是移动终端将水平视场压缩后依旧采用16：9比例存储，故需要使用后期处理软件FILMIC PRO等专业后期软件将压缩内容恢复，且矫正变形，从而使用户可以使用自身拍摄比例为16:9的移动终端拍摄画幅比为2.39：1的宽荧幕电影视频，而且无需裁剪，同时保证视频的成像质量。
本发明提供的用于移动终端的外接镜头水平视场角度增加不限于33％，当不足33％时，也可通过后期软件将压缩内容恢复，且矫正变形，并裁剪制作2.39:1的宽荧幕电影视频；较现有技术而言，水平视场角度增加，竖直视场裁剪量较小，裁剪损失内容少，拍摄宽画幅比视频的同时保证视频的成像质量。
本发明提供的用于移动终端的外接镜头不局限于拍摄画幅比为2.39:1的视频，还可通过调整第一镜片组和第二镜片组在X方向的焦距关系调整水平视场角度，从而改变拍摄比例，以适用不同的应用场景。例如，外接镜头通过使水平视场角度增加约5％，可以使用户采用自身拍摄比例为16:9的移动终端拍摄画幅比为1.85：1的宽荧幕电影视频，而且无需裁剪，同时保证视频的成像质量。
本发明提供的用于移动终端的外接镜头不局限于配合拍摄比例为16:9的移动终端摄像头使用，配合其他拍摄比例的移动终端摄像头使用时，通过扩大水平视场角度，采用相同原理仍然可以实现宽画幅比视频的拍摄，无需裁剪或裁剪内容少，并且保证视频的水平视场角度以及成像质量。
第一透镜1选用平凹柱面镜，第二透镜2选用弯月形柱面镜片可在满足光焦度、清晰度、色彩还原度等光学性能的基础上降低结构尺寸，以保证外接镜头整体的便携性。
但第一透镜1不局限于平凹柱面镜，可为其他类型的负光焦度柱面镜片。第二透镜2不局限于本实施例中的弯月形柱面镜片，可为正光焦度的双凸、平 凸柱面镜片。
第一镜片组中的第一透镜1采用低折射率，高阿贝数材料制成。第二镜片组中的第二透镜2采用高折射率，低阿贝数材料制成。一般来说，介质的折射率越大，色散越厉害，阿贝数越小；反之，介质的折射率越小，色散越不明显，阿贝数越大。通常阿贝数Vd>50的称为高阿贝数材料，Vd<40的称为低阿贝数材料。以成都光明材料为例：H-QK3L、H-FK61、H-LaF1等都是常见的高阿贝数低折射率材料，H-ZLaF4la、H-ZF88等是典型的低阿贝数高折射率材料。
本发明提供的用于移动终端的外接镜头中，第一透镜1的d光折射率Nd和阿贝数Vd满足以下条件：1.48<Nd<1.74,52<Vd<72。第二透镜2的d光折射率Nd和阿贝数Vd满足以下条件：1.7<Nd<1.95,16<Vd<30。如此设计，可保证移动终端外接本发明提供的外接镜头后拍摄视频的色彩还原度。
本发明提供的用于移动终端的外接镜头中第一透镜1和第二透镜2均为柱面镜片，柱面镜片为方形轴对称镜片，垂直于镜片作用方向的正面投影为方形，本实施例中最大柱面镜片长度<26mm,宽度<24mm，以保证最终成品的尺寸规格，从而保证外接镜头的便携性。
第一透镜1和第二透镜2装配于柱形壳体，柱形壳体、第一透镜1和第二透镜2装配成品后合称为镜头本体，镜头本体的TTL(Total Track Length，总长)小于17mm，最大外径小于38mm，从而为了保证该外接镜头的小巧、便携性，方便用户随身携带。
本发明提供的用于移动终端的外接镜头不局限于第一透镜1和第二透镜2两个柱面镜片的光学结构，可以采用两个以上的柱面镜片。例如，可采用3片2组的光学设计，包括从物方到像方依次设置第一镜片组和第二镜片组。第一镜片组包括第一透镜，第二镜片组包括胶合的第二透镜和第三透镜。第一透镜、第二透镜和第三透镜均为柱面镜片，且满足外接镜头Y方向的光焦度为零，第 一镜片组X方向的光焦度小于零，第二镜片组X方向的光焦度大于零。其他与上述实施例相同。本发明提供的外接镜头还可采用更多透镜的组合方式，符合上述实施例中关于第一镜片组和第二镜片组的设计要求即可，不过基于考虑重量、体积、成本等因素，综合衡量两个柱面镜片是较为优选的实施方式。
本实施例中移动终端为手机，外接镜头配合手机的后置摄像头使用。该外接镜头包括安装于手机的安装结构，镜头本体可拆卸安装于安装结构。本实施例中，安装结构为与手机适配的手机壳，镜头本体通过螺纹结构安装于手机壳体。显而易见地，镜头本体可通过直线滑扣、旋转卡扣以及磁吸等方式与手机壳可拆卸配合。安装结构也可为与手机部分配合或包裹手机一端的壳体结构，或者，夹持于手机的弹性夹。
本发明提供的用于移动终端的外接镜头的光学设计和尺寸设计不仅针对苹果手机CMOS芯片尺寸进行优化控制，还同时针对主流安卓手机(如华为、三星、小米、OPPO、VIVO等)进行优化控制，从而该可适用多款手机，保证了该外接镜头的兼容性。
显而易见地，该外接镜头可用于手机的前置摄像头，还可用于平板电脑、运动相机等移动终端。
本发明提供一种用于移动终端的外接镜头具体光学设计实例，具体参数如下：
Figure PCTCN2019072901-appb-000001
对上述实施例进行光学测试，测试结果如图2至图6所示。
图2为垂轴色差图，从图中可以看出通过严格色差矫正保证了该外接镜头的垂轴色差<1.5μm，从而保证手机外接本发明提供的外接镜头之后手机拍摄视频的色彩还原度。
图3和图4为相对照度图。从图中可以看出，通过优化光学结构参数保证了该外接镜头水平方向最边缘的相对光学照度>58％，垂直方向最边缘的相对光学照度>75％。从而保证手机外接本发明提供的外接镜头之后手机拍摄视频的亮度平衡性。
图5和图6为MTF像质图，从水平和垂直MTF解像模拟图中可以看出，通过严格矫正各种光学像差保证了该外接镜头具有优秀的解像素质，从而保证手机外接本发明提供的外接镜头之后手机拍摄视频的清晰度。
通过以上测试可以看出，通过手机外接本发明提供的外接镜头后，具有极高的光学成像素质。在拓展手机拍摄比例、改变手机拍摄光学特性的同时保持视频的清晰度和色彩还原度不下降。
显然，上述实施例仅仅是为清楚地说明所作的举例，而并非对实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引伸出的显而易见的变化或变动仍处于本发明创造的保护范围之中。

Claims (11)

  1. 一种用于移动终端的外接镜头，其特征在于：包括从物方到像方设置的由柱面镜片组成的第一镜片组和第二镜片组，所述第一镜片组X方向的光焦度小于零，所述第二镜片组X方向的光焦度大于零；所述外接镜头Y方向的光焦度为零。
  2. 根据权利要求1所述的外接镜头，其特征在于：所述柱面镜片设置为两枚，为第一透镜(1)和第二透镜(2)；所述第一镜片组包括所述第一透镜(1)，所述第二镜片组包括所述第二透镜(2)。
  3. 根据权利要求2所述的外接镜头，其特征在于：所述第一透镜(1)为负光焦度的平凹柱面镜片；和/或，所述第二透镜(2)为正光焦度的弯月形柱面镜片。
  4. 根据权利要求1所述的外接镜头，其特征在于：所述柱面镜片设置为三枚，为第一透镜、第二透镜和第三透镜；所述第一镜片组包括所述第一透镜，所述第二镜片组包括胶合的所述第二透镜和所述第三透镜。
  5. 根据权利要求1-4中任一项所述的外接镜头，其特征在于：所述第一镜片组和所述第二镜片组满足以下条件：
    -0.85<f 1/f 2<-0.70，
    其中f 1为所述第一镜片组X方向焦距，f 2为第二镜片组X方向焦距。
  6. 根据权利要求1-5中任一项所述的外接镜头，其特征在于：所述第一镜片组采用低折射率、高阿贝数材料制成；所述第二镜片组采用高折射率、低阿贝数材料制成。
  7. 根据权利要求1-6中任一项所述的外接镜头，其特征在于：所述第一镜 片组满足以下条件：
    1.48<Nd<1.74,52<Vd<72；
    Nd为d光折射率，Vd为阿贝数；和/或，
    所述第二镜片组满足以下条件：
    1.7<Nd<1.95,16<Vd<30；
    Nd为d光折射率，Vd为阿贝数。
  8. 根据权利要求1-7中任一项所述的外接镜头，其特征在于：所述柱面镜片为方形轴对称结构，所述外接镜头中最大柱面镜片长度<26mm,宽度<24mm。
  9. 根据权利要求8所述的外接镜头，其特征在于：所述外接镜头包括圆柱形的镜头本体，所述柱面镜片设置于所述镜头本体，所述镜头本体TTL<17.0mm，最大外径<38mm。
  10. 根据权利要求1-9中任一项所述的外接镜头，其特征在于：所述移动终端为手机，所述外接镜头配合所述手机的后置摄像头使用。
  11. 根据权利要求10所述的外接镜头，其特征在于：包括安装于所述手机的安装结构以及可拆卸安装于所述安装结构的镜头本体；所述至少两个柱面镜片设置于所述镜头本体。
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