WO2022156590A1 - 光学镜头、摄像模组及电子设备 - Google Patents

光学镜头、摄像模组及电子设备 Download PDF

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WO2022156590A1
WO2022156590A1 PCT/CN2022/071808 CN2022071808W WO2022156590A1 WO 2022156590 A1 WO2022156590 A1 WO 2022156590A1 CN 2022071808 W CN2022071808 W CN 2022071808W WO 2022156590 A1 WO2022156590 A1 WO 2022156590A1
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Prior art keywords
lens
optical
optical lens
image side
object side
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English (en)
French (fr)
Inventor
黄山福
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Priority to EP22742069.2A priority Critical patent/EP4283370B1/en
Priority to JP2023542814A priority patent/JP7606621B2/ja
Priority to ES22742069T priority patent/ES3038273T3/es
Publication of WO2022156590A1 publication Critical patent/WO2022156590A1/zh
Priority to US18/355,031 priority patent/US20230358998A1/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • 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
    • 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
    • G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
    • G02B15/1431—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive
    • G02B15/143101—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being positive arranged +--
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation

Definitions

  • the present application relates to the technical field of optical imaging, and in particular, to an optical lens, a camera module and an electronic device.
  • the main camera of smart terminals can surpass some SLR cameras in terms of pixels, reaching 50 million pixels or even higher, but there is still a big gap with SLR cameras in terms of high-magnification zoom lenses at long focal lengths.
  • the current smartphone camera configuration is usually: a main camera with an equivalent focal length of about 24mm to 25mm; an ultra-wide-angle camera with an equivalent focal length of about 16mm to 18mm; and a telephoto lens with an equivalent focal length of 50mm to 130mm. match.
  • the optical zoom ratio of the camera configured as above can only be up to 5.2x, which will be obviously insufficient in the shooting scenes that require higher magnification and farther.
  • the present application proposes an optical lens, a camera module and an electronic device, which can provide a small high-magnification lens for a mobile terminal, improve the zoom magnification, and meet the lens magnification requirement in a farther shooting scene.
  • an embodiment of the present application provides an optical lens, including from the object side to the image side along the optical axis:
  • a first lens having a positive bending force the first lens is convex toward the object side surface, and the first lens is convex toward the image side surface;
  • a second lens having a negative bending power the surface of the second lens toward the object side is convex, and the surface of the second lens toward the image side is concave;
  • a third lens having a negative bending force the surface of the third lens toward the object side is concave, and the surface of the third lens toward the image side is convex;
  • the Abbe numbers of the first lens, the second lens and the third lens are V1, V2 and V3, respectively, which satisfy:
  • the effective focal length of the optical lens is f, and f>20mm.
  • an embodiment of the present application provides a camera module, where the camera module includes the optical lens described in the first aspect, and an image sensor, and the image sensor is disposed on the image side of the optical lens.
  • an embodiment of the present application provides an electronic device, including the camera module described in the second aspect above.
  • the beneficial effects brought by the technical solutions provided by the embodiments of the present application at least include: providing an optical lens, which includes, from the object side to the image side along the optical axis: a first lens having a positive bending force, the first lens facing the object The side surface is convex, and the first lens is convex toward the image side; the second lens has a negative bending force, the second lens is convex toward the object side, and the second lens is convex toward the image side.
  • the surface is concave; the third lens with negative bending force, the surface of the third lens toward the object side is concave, and the surface of the third lens toward the image side is convex; the effective focal length of the optical lens is f, f >20mm; when the camera module composed of the above-mentioned optical lens cooperates with a small-sized image sensor, it can reach an equivalent focal length of more than 200mm and a zoom ratio of 10x, which can enable the electronic equipment equipped with the camera module provided by the embodiments of the present application, such as The mobile terminal satisfies the long focal length requirements of farther shooting scenes.
  • FIG. 1 is a schematic structural diagram of an optical lens provided by an embodiment of the application.
  • FIG. 2 is a schematic structural diagram of an optical lens provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a camera module provided by an embodiment of the present application.
  • FIG. 7 is a field curvature curve of an optical lens provided by an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of an optical lens provided by an embodiment of the present application, which includes from the object side to the image side along the optical axis:
  • a first lens L1 with a positive refracting power the first lens L1 is convex toward the object side, and the first lens L1 is convex toward the image side;
  • the Abbe numbers of the first lens, the second lens and the third lens are V1, V2 and V3, respectively, which satisfy:
  • the effective focal length of the optical lens L0 is f, and f>20mm.
  • the optical lens L0 shown in FIG. 1 includes a first lens L1, a second lens L2, and a third lens L3 from the object side to the image side along the optical axis;
  • the first lens L1 is a biconvex lens
  • the two surfaces of L1 are respectively convex toward the object side and the image side along the center of the optical axis;
  • the second lens L2 is a convex-concave lens, the surface of L2 toward the object side is convex toward the object side along the center of the optical axis, and the surface of L2 toward the image side is along the edge
  • the center of the optical axis is concave;
  • the third lens L3 is a meniscus lens, the surface of L3 toward the object side is concave toward the object side along the center of the optical axis, and the surface of L3 toward the image side is convex toward the image side along the center of the optical axis.
  • the Abbe numbers of the first lens, the second lens, and the third lens are required to be V1, V2, and V3, respectively, which satisfy the following requirements: Scale requirements:
  • the effective focal length of the optical lens L0 is f, and f>20 mm.
  • the combined focal length of the first lens L1 , the second lens L2 and the third lens L3 is greater than 20 mm.
  • small-sized image sensors such as complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS), charge coupled device (Charge Coupled Device, CCD) with a diagonal length of effective imaging size between 3.8mm and 4.4mm. sensor.
  • CMOS complementary metal oxide semiconductor
  • CCD Charge Coupled Device
  • the effective focal length mentioned in this application refers to the effective focal length (Effective Focal Length, EFL), that is, the actual focal length of the optical lens or lens.
  • Equivalent focal length refers to the length of the diagonal of the image area of the camera photoelectric sensor (imaging sensor) chip. When it is equivalent to the diagonal length of the 35mm camera frame (42.27mm), the actual focal length of the lens corresponds to the 35mm camera lens focal length.
  • Equivalent focal length effective focal length ⁇ lens conversion factor
  • Lens conversion factor 43.3mm (diagonal length of imaging area of full-frame camera sensor) ⁇ (diagonal length of imaging area of image sensor);
  • the smaller the size of the sensor the smaller the diagonal length of the imaging area, the higher its lens conversion factor.
  • the equivalent focal length on the camera is also 20mm;
  • the diagonal is about 6.64mm, and the lens conversion factor is about 6.5.
  • the equivalent focal length is about 130mm;
  • the optical lens provided in this application can achieve an equivalent focal length of more than 200mm with a small-sized sensor.
  • a 1/4-inch image sensor is used, its diagonal is about 4mm, and the lens conversion factor can reach 10.82.
  • the camera module composed of the optical lens and the small-sized sensor can be mounted on electronic devices such as mobile phones, tablet computers, etc., to meet the user's requirement for using a long focal length.
  • the refractive indices of the first lens L1, the second lens L2, and the third lens L3 are N1, N2, and N3, respectively, and satisfy:
  • the first lens L1 uses a material with a lower refractive index, such as glass, and a lens made of a material with a lower refractive index can usually obtain better dispersion control;
  • the second lens L2 and the third lens L3 use relatively A plastic (resin) lens with a high refractive index is matched with a plastic (resin) lens with a lower refractive index, which can reduce the cost without destroying the dispersion performance of the optical lens L0.
  • the refractive index N1 of the first lens L1 is smaller than the refractive index N3 of the third lens L3, and the refractive index N3 of the third lens L3 is smaller than the refractive index N2 of the second lens L2.
  • L1 , L2 , L3 and each of their surfaces are marked, the surface L1S1 of the first lens L1 facing the object side is a spherical surface, and the curvature radius is R1 , 0mm ⁇ R1 ⁇ 10mm.
  • the telephoto lens can effectively avoid ghost-like stray light, and the use of a low-refractive-index glass lens can effectively suppress dispersion.
  • the surface L1S2 of the first lens L1 facing the image side is a spherical surface, and the radius of curvature is R2, -28mm ⁇ R2 ⁇ -10mm;
  • the surface L2S1 of the second lens L2 facing the object side is an aspherical surface, and the radius of curvature is R3, 20mm ⁇ R3 ⁇ 50mm.
  • the cooperation of L1S2 and L2S1 can reduce the incident angle of light to avoid stray light.
  • the surface L2S2 of the second lens L2 facing the image side is an aspherical surface, and the radius of curvature is R4, 10mm ⁇ R4 ⁇ 25mm.
  • the curved surface of L2S2 is relatively flat, which can reduce spherical aberration.
  • the surface L3S1 of the third lens L3 facing the object side is aspherical, and the radius of curvature is R5, -10mm ⁇ R5 ⁇ -1mm;
  • the surface L3S2 of the third lens L3 facing the image side is an aspherical surface, and the radius of curvature is R6, -13mm ⁇ R6 ⁇ -2mm.
  • the combination of R5 and R6 as a lens with negative bending force can make the optical lens provided by the embodiment of the present application, when used in an image sensor with a diagonal length between 3.8mm and 4.4mm, control the field curvature and aberration to reach High Modulation Transfer Function (MTF) effect.
  • MTF High Modulation Transfer Function
  • the effective focal lengths of the first lens L1, the second lens L2 and the third lens L3 are respectively f1, f2, and f3 to satisfy:
  • the combination of L1, L2, and L3 can make the effective focal length f of the optical lens L0 >20 mm.
  • the central thicknesses of the first lens, the second lens, and the third lens are CT1, CT2, and CT3, respectively, and satisfy:
  • the thinner center thickness can make the optical lens provided by the embodiment of the present application more compact and easier to be mounted on a mobile terminal, such as a mobile phone and a tablet computer.
  • the optical lens further includes an aperture, and the aperture is disposed between the first lens and the second lens.
  • the position of the aperture is located between L1 and L2.
  • the aperture is placed between L1 and L2, which can effectively control aberrations and achieve better manufacturing sensitivity.
  • the optical lens further includes an infrared filter L4 , and the infrared filter L4 is disposed on the image side of the third lens L3 .
  • the optical lens further includes a prism L5, the prism L5 is disposed on the image side of the third lens L3, and the prism is used to change the direction of light.
  • the image side of the third lens L3 is respectively provided with an infrared filter L4 and a prism L5 in sequence.
  • the setting of the prism L5 enables the imaging sensor C1 to be installed above the lenses L1-L3, and above the lenses L4 and L5, so that C1 does not need to be installed on the image side of the optical lens along the optical axis, thereby reducing the volume of the optical lens and making it More space-saving when mounted on electronic equipment.
  • the optical lens provided by the embodiments of the present application can form a camera module with an image sensor, which is applied to electronic devices (such as mobile phones, tablet computers, etc.) Sensors (photosensitive elements such as CDD, CMOS, etc.) are used together, and are suitable for visible light in the wavelength range of 400nm to 700nm.
  • the effective focal length EFL of the optical lens L0 is 24mm ⁇ EFL ⁇ 25mm
  • the aperture value is F3.5
  • the Diagonal Field of View (DFOV) 9.4°
  • the equivalent focal length can reach 250mm
  • the zoom ratio is Up to 10x, DFOV optimized to within 10 degrees.
  • Figure 4 shows the optical distortion (Optical distortion), -1% ⁇ optical distortion ⁇ 1%
  • Figure 5 shows the relative illumination (Relative illumination), relative illumination > 95%
  • Fig. 6 shows the on-axis chromatic aberration, showing the on-axis chromatic aberration of light with wavelengths of 470 nm, 550 nm, and 650 nm, respectively;
  • FIG. 7 shows the field curvature, showing the Sagittal and Tangential field curvatures, respectively.
  • the aspherical surface coefficients are obtained according to the aspherical surface equations, and the specific implementation parameters are shown in Table 1.
  • the parameters are:
  • the optical lens provided by the embodiment of the present application can achieve an equivalent focal length of more than 200 mm and a zoom magnification of 10x when the camera module formed by the camera module and the small-sized image sensor is mounted on an electronic device. , so that an electronic device equipped with the camera module provided by the embodiment of the present application, such as a mobile terminal, can meet the long focal length requirement of a farther shooting scene.
  • an embodiment of the present application provides a camera module 30, the camera module 30 includes the optical lens L0 according to any one of the embodiments of the present application, and an image sensor C1, the image sensor C1 is arranged on the image side of the optical lens L0.
  • the optical signal is transmitted to the image sensor C1 through the optical lens L0 , and the image sensor C1 converts the optical signal into an electrical signal corresponding to the image optical signal, and then transmits it to the electronic device carrying the camera module 30 .
  • the effective imaging size of the image sensor C1 is a diagonal length of 3.8 mm ⁇ 4.4 mm.
  • the combination of the image sensor C1 and the optical lens L0 can achieve a 10x zoom magnification and an equivalent focal length of 200mm or more, meeting the needs of long focal lengths.
  • the embodiment of the present application also provides an electronic device, including the camera module provided by the embodiment of the present application.
  • the electronic device is also equipped with a display module such as a display screen, and the user can see the framing effect through the display module such as the screen of the electronic device, and then shoot.
  • the electronic device in the embodiments of the present application may be a mobile electronic device or a non-mobile electronic device.
  • the mobile electronic device may be a mobile phone, a tablet computer, a notebook computer, a palmtop computer, an in-vehicle electronic device, a wearable device, an Ultra-Mobile Personal Computer (UMPC), a netbook, or a personal digital assistant (Personal Digital Assistant).
  • UMPC Ultra-Mobile Personal Computer
  • PDA Personal Digital Assistant
  • the non-mobile electronic device may be a personal computer (Personal Computer, PC), a television (Television, TV), a teller machine or a self-service machine, etc., which are not specifically limited in the embodiments of the present application.
  • the electronic device in this embodiment of the present application may be an apparatus having an operating system.
  • the operating system may be an Android (Android) operating system, an ios operating system, or other possible operating systems, which are not specifically limited in the embodiments of the present application.
  • the electronic equipment provided by the embodiments of the present application can be equipped with the optical lenses shown in FIGS. 1 to 7 and the camera module shown in FIG. 3 , thereby achieving a zoom ratio of 10x and an equivalent focal length of more than 200 mm, meeting the requirement for long focal lengths.

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  • Physics & Mathematics (AREA)
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  • Optics & Photonics (AREA)
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Abstract

一种光学镜头(L0)、摄像模组(30)及电子设备，属于光学成像技术领域，光学镜头(L0)沿光轴从物侧到像侧包括：具有正曲折力的第一透镜(L1)，第一透镜(L1)朝物侧的面(L1S1)凸出，第一透镜(L1)朝像侧的面(L1S2)凸出；具有负曲折力的第二透镜(L2)，第二透镜(L2)朝物侧的面(L2S1)凸出、第二透镜(L2)朝像侧的面(L2S2)凹入；具有负曲折力的第三透镜(L3)，第三透镜(L3)朝物侧的面(L3S1)凹入、第三透镜(L3)朝像侧的面(L3S2)凸出；光学镜头(L0)的有效焦距为f，f>20mm。

Description

光学镜头、摄像模组及电子设备
相关申请的交叉引用
本申请主张在2021年01月20日在中国提交的中国专利申请No.202110074970.6的优先权，其全部内容通过引用包含于此。
技术领域
本申请涉及光学成像技术领域，尤其涉及一种光学镜头、摄像模组及电子设备。
背景技术
现在，随着智能终端技术的不断进步，如智能手机等拍摄功能已成为不可缺少的一部分，用户对拍摄质量的要求也越来越高。因此，对摄像头的要求也越来越高，不论是对画质、对焦速度或是变焦倍率的要求都变的更高。
目前，智能终端的主摄像头像素上目前已经能够超越部分单反相机，达到五千万像素甚至更高，但是在长焦段高倍率变焦镜头方面，仍与单反相机有很大差距。现在的智能手机摄像头配置通常为：一个主摄相机，其等效焦距约24mm～25mm；一个超广角相机，其等效焦距约16mm～18mm；以及一个等效焦距50mm～130mm的长焦镜头进行搭配。如上述配置的摄像头光学变焦倍率最高只能到5.2x，在需要更高倍、更远的拍摄场景下会有明显不足。
发明内容
本申请提出了一种光学镜头、摄像模组及电子设备，能够为移动终端提供小型高倍率镜头，提高变焦倍率，满足在更远拍摄场景下的镜头倍率需求。
为了实现上述目的，本申请采用了如下方案：
第一方面，本申请实施例提供了一种光学镜头，沿光轴从物侧到像侧包括：
具有正曲折力的第一透镜，所述第一透镜朝物侧的面凸出，所述第一透镜朝像侧的面凸出；
具有负曲折力的第二透镜，所述第二透镜朝物侧的面凸出、所述第二透镜朝像侧的面凹入；
具有负曲折力的第三透镜，所述第三透镜朝物侧的面凹入、所述第三透镜朝像侧的面凸出；
所述第一透镜、第二透镜和第三透镜的阿贝数分别为V1、V2、V3，满足：
Figure PCTCN2022071808-appb-000001
且
Figure PCTCN2022071808-appb-000002
所述光学镜头的有效焦距为f，f>20mm。
第二方面，本申请实施例提供了一种摄像模组，所述摄像模组包括上述第一方面所述的光学镜头，以及图像传感器，所述图像传感器设置在所述光学镜头的像侧。
第三方面，本申请实施例提供了一种电子设备，包括上述第二方面所述的摄像模组。
本申请实施例提供的技术方案带来的有益效果至少包括：提供了一种光学镜头，沿光轴从物侧到像侧包括：具有正曲折力的第一透镜，所述第一透镜朝物侧的面凸出，所述第一透镜朝像侧的面凸出；具有负曲折力的第二透镜，所述第二透镜朝物侧的面凸出、所述第二透镜朝像侧的面凹入；具有负曲折力的第三透镜，所述第三透镜朝物侧的面凹入、所述第三透镜朝像侧的面凸出；所述光学镜头的有效焦距为f，f>20mm；上述光学镜头组成的摄像模组配合小尺寸图像传感器时，能够达到200mm以上的等效焦距，达到10x的变焦倍率，能够使搭载本申请实施例提供的摄像模组的电子设备，如移动终端满足更远拍摄场景的长焦距需求。
附图说明
图1为本申请实施例提供的一种光学镜头结构示意图；
图2为本申请实施例提供的一种光学镜头结构示意图；
图3为本申请实施例提供的一种摄像模组的结构示意图；
图4为本申请实施例提供的一种光学镜头的光学畸变曲线；
图5为本申请实施例提供的一种光学镜头的相对照度曲线；
图6为本申请实施例提供的一种光学镜头的轴上色差曲线；
图7为本申请实施例提供的一种光学镜头的场曲曲线。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，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，都属于本申请保护的范围。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”，一般表示前后关联对象是一种“或”的关系。
下面结合附图，通过具体的实施例及其应用场景对本申请实施例提供的光学镜头、摄像模组和电子设备进行详细地说明。
参见图1，图1是本申请实施例提供的光学镜头结构示意图，沿光轴从物侧到像侧包括：
具有正曲折力的第一透镜L1，所述第一透镜L1朝物侧的面凸出，所述第一透镜L1朝像侧的面凸出；
具有负曲折力的第二透镜L2，所述第二透镜L2朝物侧的面凸出、所述第二透镜L2朝像侧的面凹入；
具有负曲折力的第三透镜L3，所述第三透镜L3朝物侧的面凹入、所述第三透镜L3朝像侧的面凸出；
所述第一透镜、第二透镜和第三透镜的阿贝数分别为V1、V2、V3，满足：
Figure PCTCN2022071808-appb-000003
且
Figure PCTCN2022071808-appb-000004
所述光学镜头L0的有效焦距为f，f>20mm。
示例性的，如图1所示的光学透镜L0，从沿光轴从物侧到像侧包括第一 透镜L1、第二透镜L2、第三透镜L3；其中，第一透镜L1为双凸透镜，L1的两个面分别沿光轴中心向物侧及像侧凸出；第二透镜L2为凸凹透镜，L2朝向物侧的面沿光轴中心向物侧凸出，L2朝像侧的面沿光轴中心凹入；第三透镜L3为凹凸透镜，L3朝向物侧的面沿光轴中心向物侧凹入，L3朝像侧的面沿光轴中心向像侧凸出。
具体的，阿贝数越低，色散控制越差，为了保证光学镜头的色彩性能，要求所述第一透镜、第二透镜和第三透镜的阿贝数分别为V1、V2、V3，满足如下的比例要求：
Figure PCTCN2022071808-appb-000005
且
Figure PCTCN2022071808-appb-000006
此外，透镜的阿贝数与折射率之间通常存在这样的关系，阿贝数越高，色散控制越好，对应的材质的折射率越低。
具体的，所述光学镜头L0的有效焦距为f，f>20mm，参考图1所示的光学镜头L0，第一透镜L1、第二透镜L2和第三透镜L3的组合焦距大于20mm。所述光学镜头在应用于电子设备，如移动终端时，配合小尺寸图像传感器能够达到200mm以上的等效焦距，以及10x的变焦倍率，并能优化视场角。其中，小尺寸图像传感器如，有效成像大小的对角长度介于3.8mm～4.4mm之间的互补金属氧化物半导体(Complementary Metal Oxide Semiconductor，CMOS)、电荷耦合器件(Charge Coupled Device，CCD)感光传感器。
具体的，本申请中提到的有效焦距指的是，有效焦距(Effective Focal Length，EFL)，即该光学镜头、或透镜的实际焦距。
等效焦距，指的是相机光电传感器(成像传感器)芯片影像区域对角线的长度，等效成35mm照相机画幅对角线长度(42.27mm)时，其镜头的实际焦距所对应的35mm照相机镜头的焦距。
等效焦距＝有效焦距×镜头转换系数；
镜头转换系数＝43.3mm(全幅相机传感器成像区域对角线长度)÷(图像传感器成像区域对角线长度)；
通常传感器的尺寸越小(成像区域对角线长度越小)它的镜头转换系数越高，如，全画幅相机的传感器的镜头转换系数为1，则f＝20mm的光学镜头在该全画幅相机上的等效焦距也为20mm；
如1/2.7英寸的图像传感器，对角线6.64mm左右，镜头转换系数约为6.5，配合f＝20mm的光学镜头，等效焦距约为130mm；
因此将本申请提供的光学镜头，配合小尺寸的传感器能达到200mm以上的等效焦距，如使用1/4英寸的图像传感器，其对角线约4mm，可达10.82的镜头转化系数，使用1/3英寸的图像传感器，起对角线约3mm，可达14.42的镜头转化系数；
并且，由于传感器尺寸的小巧，使得本光学镜头与小尺寸传感器组成的摄像模组能够搭载于电子设备如手机，平板电脑等，满足用户对长焦距的使用需求。
可选的，所述第一透镜L1、第二透镜L2和第三透镜L3的折射率分别为N1、N2、N3，满足：
N1<N3<N2。
具体的，第一透镜L1使用折射率较低的材质，如玻璃，较低的折射率的材质制成的镜片通常能够获得更好的色散控制；第二透镜L2、第三透镜L3分别使用较高折射率的塑料(树脂)镜片搭配较低折射率的塑料(树脂)镜片，能够降低成本，并且不破坏光学镜头L0的色散性能。
具体的，使第一透镜L1的折射率N1小于第三透镜L3的折射率N3，第三透镜L3的折射率N3小于第二透镜L2的折射率N2。
参考图2，标注了L1、L2、L3以及它们的每一个面，所述第一透镜L1朝物侧的面L1S1为球面，曲率半径为R1，0mm<R1<10mm。
具体的，如上述L1S1为凸面，可以有效避免长焦镜头产生鬼影类的杂散光，且使用低折射率玻璃镜片，可以有效抑制色散。
可选的，所述第一透镜L1朝像侧的面L1S2为球面，曲率半径为R2，-28mm<R2<-10mm；
所述第二透镜L2朝物侧的面L2S1为非球面，曲率半径为R3，20mm<R3<50mm。
具体的，L1S2与L2S1的配合可以减小光线入射角度避免杂散光。
可选的，所述第二透镜L2朝像侧的面L2S2为非球面，曲率半径为R4，10mm<R4<25mm。
具体的，L2S2的曲面较平，可减小球面像差。
可选的，所述第三透镜L3朝物侧的面L3S1为非球面，曲率半径为R5，-10mm<R5<-1mm；
所述第三透镜L3朝像侧的面L3S2为非球面，曲率半径为R6，-13mm<R6<-2mm。
具体的，R5与R6搭配为负曲折力的透镜可以使得本申实施例提供的光学镜头在使用在对角长度在3.8mm～4.4mm之间的图像传感器时，可以控制场曲与向差达到高调制传递函数(Modulation Transfer Function，MTF)效果。
可选的，所述第一透镜L1、第二透镜L2和第三透镜L3的有效焦距分别为f1、f2、f3满足：
8.0mm<f1<15mm；
-80mm<f2<-40mm；
-30mm<f3<-15mm。
具体的，L1、L2、L3组合后能够使光学镜头L0的有效焦距f>20mm。
可选的，所述第一透镜、第二透镜和第三透镜的中心厚度分别为CT1、CT2、CT3,满足：
1mm<CT1<3mm；
1mm<CT2<4mm；
1mm<CT3<4mm。
具体的，较薄的中心厚度能够使本申请实施例提供的光学镜头更小巧，更易于搭载在移动终端，如手机、平板电脑上。
可选的，所述光学镜头还包括光圈，所述光圈设置于所述第一透镜和第二透镜之间。
具体的，光圈位置位于L1与L2之间，参考图3，光圈放置于L1与L2之间可以有效控制像差与较好制造敏感度。
可选的，参考图2，所述光学镜头还包括红外线滤光片L4，所述红外线滤光片L4设置于所述第三透镜L3的像侧。
可选的，参考图2，所述光学镜头还包括棱镜L5，所述棱镜L5设置于所述第三透镜L3的像侧，所述棱镜用于改变光线的方向。
具体的，参考图3，第三透镜L3的像侧按顺序分别设有红外线滤光片L4、棱镜L5。棱镜L5的设置，能够使得成像传感器C1安装于透镜L1-L3，以及L4、L5的上方，使得C1无需沿光轴安装在光学镜头的像侧，从而实现缩小所述光学镜头的体积，使其搭载于电子设备时，更节约空间。
具体的，本申请实施例提供的光学镜头可与图像传感器组成摄像模块，应用于电子设备(如手机、平板电脑等)，能与有效成像大小的对角长度介于3.8mm～4.4mm的图像传感器(感光元件如CDD、CMOS等)搭配使用，适用于波长范围400nm～700nm的可见光。
具体的，参考图4-7，为本申请实施例提供的一种光学镜头的性能参数。
具体的，光学镜头L0的有效焦距EFL为，24mm<EFL<25mm，光圈值为F3.5，对角线视角(Diagonal Field of View，DFOV)＝9.4°，等效焦距可达250mm，变焦倍率可达10x，将DFOV优化至10度内。
图4示出了光学畸变(Optical distortion)，-1％<光学畸变<1％；
图5示出了相对照度(Relative illumination)，相对照度>95％；
图6示出了轴上色差，分别示出了波长为470nm、550nm，650nm的光线的轴上色差；
图7示出了场曲，分别示出了矢向(Sagittal)和切向(Tangential)的场曲。
具体的，由于L2和L3的两个面都是非球面，非球面系数根据非球面方程获得，具体实施参数如表一所示。
非球面方程如下：
Figure PCTCN2022071808-appb-000007
其中，参数分别为：
z：非球面Z轴位置；
c：曲率半径的倒数；
r：非球面R轴位置；
k：圆锥系数；
α i：非球面系数；
ρ：等同非球面R轴位置。
表1，光学镜头参数对照表        单位mm
Figure PCTCN2022071808-appb-000008
非球面系数A、B与C分别为非球面项次i＝1、i＝2与i＝3时的系数值。
综上所述，本申请实施例提供的一种光学镜头，组成的摄像模组配合小尺寸图像传感器组成摄像模组搭载于电子设备时，能够达到200mm以上的等效焦距，达到10x的变焦倍率，能够使搭载本申请实施例提供的摄像模组的电子设备，如移动终端满足更远拍摄场景的长焦距需求。
参考图3，本申请实施例提供了一种摄像模组30，所述摄像模组30包括如本申请实施例提供的任一项所述的光学镜头L0，以及图像传感器C1，所述图像传感器C1设置在所述光学镜头L0的像侧。
具体的，通过光学镜头L0将光信号传递至图像传感器C1，图像传感器C1将光信号转化成对应图像光信号的电信号，再传递至搭载所述摄像模组30的电子设备。
具体的，图像传感器C1的有效成像尺寸为，对角线长度3.8mm～4.4mm。
具体的，通过图像传感器C1和光学镜头L0组合能够实现10x变焦倍率，及200mm以上的等效焦距，满足长焦距使用需求
本申请实施例还提供了一种电子设备，包括本申请实施例提供摄像模组。所述电子设备还搭载有显示屏幕等显示模块，用户可以通过电子设备的屏幕等显示模块，看到取景效果，从而进行拍摄。
本申请实施例中的电子设备，可以是移动电子设备，也可以为非移动电子设备。示例性的，移动电子设备可以为手机、平板电脑、笔记本电脑、掌上电脑、车载电子设备、可穿戴设备、超级移动个人计算机(Ultra-Mobile Personal Computer，UMPC)、上网本或者个人数字助理(Personal Digital  Assistant，PDA)等，非移动电子设备可以为个人计算机(Personal Computer，PC)、电视机(Television，TV)、柜员机或者自助机等，本申请实施例不作具体限定。
本申请实施例中的电子设备可以为具有操作系统的装置。该操作系统可以为安卓(Android)操作系统，可以为ios操作系统，还可以为其他可能的操作系统，本申请实施例不作具体限定。
本申请实施例提供的电子设备能够搭载图1至图7的光学镜头，以及图3中的摄像模组，从而实现10x变焦倍率，及200mm以上的等效焦距，满足长焦距使用需求。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。此外，需要指出的是，本申请实施方式中的方法和装置的范围不限按示出或讨论的顺序来执行功能，还可包括根据所涉及的功能按基本同时的方式或按相反的顺序来执行功能，例如，可以按不同于所描述的次序来执行所描述的方法，并且还可以添加、省去、或组合各种步骤。另外，参照某些示例所描述的特征可在其他示例中被组合。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如只读存储器(Read-Only Memory，ROM)/随机存取存储器(Random Access Memory，RAM)、磁碟、光盘)中，包括若干指令用以使得一台终端(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本申请各个实施例所述的方法。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上 述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (12)

  1. 一种光学镜头，沿光轴从物侧到像侧包括：
    具有正曲折力的第一透镜，所述第一透镜朝物侧的面凸出，所述第一透镜朝像侧的面凸出；
    具有负曲折力的第二透镜，所述第二透镜朝物侧的面凸出，所述第二透镜朝像侧的面凹入；
    具有负曲折力的第三透镜，所述第三透镜朝物侧的面凹入，所述第三透镜朝像侧的面凸出；
    所述第一透镜、第二透镜和第三透镜的阿贝数分别为V1、V2、V3，满足：
    Figure PCTCN2022071808-appb-100001
    且
    Figure PCTCN2022071808-appb-100002
    所述光学镜头的有效焦距为f，f>20mm。
  2. 根据权利要求1所述的光学镜头，其中，所述第一透镜朝物侧的面为球面，曲率半径为R1，0mm<R1<10mm。
  3. 根据权利要求1所述的光学镜头，其中，所述第一透镜朝像侧的面为球面，曲率半径为R2，-28mm<R2<-10mm；
    所述第二透镜朝物侧的面为非球面，曲率半径为R3，20mm<R3<50mm。
  4. 根据权利要求1所述的光学镜头，其中，所述第二透镜朝像侧的面为非球面，曲率半径为R4，10mm<R4<25mm。
  5. 根据权利要求1所述的光学镜头，其中，所述第三透镜朝物侧的面为非球面，曲率半径为R5，-10mm<R5<-1mm；
    所述第三透镜朝像侧的面为非球面，曲率半径为R6，-13mm<R6<-2mm。
  6. 根据权利要求1所述的光学镜头，其中，所述第一透镜、第二透镜和第三透镜的有效焦距分别为f1、f2、f3满足：
    8.0mm<f1<15mm；
    -80mm<f2<-40mm；
    -30mm<f3<-15mm。
  7. 根据权利要求1所述的光学镜头，其中，所述第一透镜、第二透镜和第三透镜的中心厚度分别为CT1、CT2、CT3，满足：
    1mm<CT1<3mm；
    1mm<CT2<4mm；
    1mm<CT3<4mm。
  8. 根据权利要求1所述的光学镜头，其中，还包括光圈，所述光圈设置于所述第一透镜和第二透镜之间。
  9. 根据权利要求1所述的光学镜头，其中，还包括红外线滤光片，所述红外线滤光片设置于所述第三透镜的像侧。
  10. 根据权利要求1所述的光学镜头，其中，还包括棱镜，所述棱镜设置于所述第三透镜的像侧，所述棱镜用于改变光线的方向。
  11. 一种摄像模组，其中，所述摄像模组包括如权利要求1-10任一项所述的光学镜头，以及图像传感器，所述图像传感器设置在所述光学镜头的像侧。
  12. 一种电子设备，其中，包括如权利要求11所述的摄像模组。
PCT/CN2022/071808 2021-01-20 2022-01-13 光学镜头、摄像模组及电子设备 Ceased WO2022156590A1 (zh)

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