WO2020140788A1 - 长焦镜头及移动终端 - Google Patents

长焦镜头及移动终端 Download PDF

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Publication number
WO2020140788A1
WO2020140788A1 PCT/CN2019/127517 CN2019127517W WO2020140788A1 WO 2020140788 A1 WO2020140788 A1 WO 2020140788A1 CN 2019127517 W CN2019127517 W CN 2019127517W WO 2020140788 A1 WO2020140788 A1 WO 2020140788A1
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WO
WIPO (PCT)
Prior art keywords
lens
telephoto lens
telephoto
image
focal length
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2019/127517
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English (en)
French (fr)
Inventor
刘绪明
曾昊杰
曾吉勇
王庆平
邓良君
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangxi Lianyi Optics Co Ltd
Original Assignee
Jiangxi Lianyi Optics Co Ltd
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 Jiangxi Lianyi Optics Co Ltd filed Critical Jiangxi Lianyi Optics Co Ltd
Priority to EP19906814.9A priority Critical patent/EP3876019B1/en
Priority to US16/920,362 priority patent/US11340428B2/en
Publication of WO2020140788A1 publication Critical patent/WO2020140788A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • 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
    • G02B13/006—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
    • G02B13/001—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
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
    • 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
    • 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
    • G03B17/02—Bodies
    • G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils

Definitions

  • the invention relates to the technical field of optical lenses, in particular to a telephoto lens and a mobile terminal.
  • the equivalent focal length ratio of the conventional telephoto lens and the wide-angle lens is between 3 and 5 times, and the combined use can make the zoom ratio reach 3 to 5 times, compared with the traditional zoom lens It is too small to meet the needs of miniaturization and high-definition imaging of portable electronic products.
  • An object of the present invention is to provide a telephoto lens and a mobile terminal to solve the above problems.
  • the present invention provides a telephoto lens, which includes, in order from the object side to the image side, a first lens with positive power, a second lens with power, a third lens with negative power, Flat glass and filters.
  • the object-side surface of the first lens is convex, and the image-side surface of the third lens is concave.
  • the present invention provides a mobile terminal.
  • the mobile terminal includes a telephoto lens and an image sensor.
  • the image sensor is disposed on an imaging surface of the telephoto lens, and is configured to receive an optical signal output by the telephoto lens and form a signal corresponding to the optical signal. electric signal.
  • the telephoto lens and the mobile terminal provided by the present invention can achieve a higher zoom ratio.
  • the equivalent focal length ratio of the telephoto lens and the conventional wide-angle lens provided by the present invention is more than 8 times, that is, the present invention
  • the provided telephoto lens is used in combination with a conventional wide-angle lens to achieve more than 8 times zoom, which can better meet the needs of miniaturization and high-definition imaging of electronic products.
  • FIG. 1 is a schematic structural diagram of a telephoto lens in a first embodiment of the present invention.
  • FIG. 2 is a field curvature curve diagram of the telephoto lens in the first embodiment of the present invention.
  • FIG 3 is a graph of the spherical aberration on the axis of the telephoto lens in the first embodiment of the present invention.
  • FIG. 4 is a lateral chromatic aberration curve diagram of the telephoto lens in the first embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a telephoto lens in a second embodiment of the present invention.
  • FIG. 6 is a field curve diagram of a telephoto lens in a second embodiment of the invention.
  • FIG. 7 is a graph of the spherical aberration on the axis of the telephoto lens in the second embodiment of the present invention.
  • FIG. 8 is a lateral chromatic aberration curve diagram of a telephoto lens in a second embodiment of the invention.
  • FIG. 9 is a schematic structural diagram of a telephoto lens in a third embodiment of the present invention.
  • FIG. 10 is a field curvature curve diagram of a telephoto lens in a third embodiment of the present invention.
  • FIG. 11 is a graph of the spherical aberration on the axis of the telephoto lens in the third embodiment of the present invention.
  • FIG. 12 is a lateral chromatic aberration curve diagram of a telephoto lens in a third embodiment of the invention.
  • FIG. 13 is a schematic structural diagram of a telephoto lens in a fourth embodiment of the present invention.
  • FIG. 14 is a field curve diagram of a telephoto lens in a fourth embodiment of the present invention.
  • 15 is a graph of the spherical aberration on the axis of the telephoto lens in the fourth embodiment of the present invention.
  • 16 is a lateral chromatic aberration curve diagram of a telephoto lens in a fourth embodiment of the invention.
  • FIG. 17 is a schematic structural diagram of a mobile terminal in a fifth embodiment of the present invention.
  • Fig. 18 is a top view of Fig. 17.
  • An embodiment of the present invention provides a telephoto lens, which includes, in order from the object side to the image side, a first lens with positive power, a second lens with power, a third lens with negative power, and flat glass And filters.
  • the object-side surface of the first lens is convex, and the image-side surface of the third lens is concave.
  • the telephoto lens satisfies the conditional formula: 0.75 ⁇ TTL/f ⁇ 2.0;
  • TTL represents the total optical length of the telephoto lens
  • f represents the focal length of the telephoto lens. Satisfying the above conditions can effectively shorten the total optical length of the lens and promote the miniaturization of the lens.
  • the flat glass satisfies the conditional formula: N d4 >1.8;
  • N d4 represents the refractive index of flat glass.
  • Flat glass uses high refractive index materials to facilitate the incidence of light.
  • the first lens is made of glass. Because the temperature resistance of the glass material is better and the performance is more stable, the first lens adopts the glass material to effectively achieve the heat dissipation difference of the lens.
  • the telephoto lens satisfies the conditional expression: 3 ⁇ f/R 1 ⁇ 5;
  • f represents the focal length of the telephoto lens
  • R 1 represents the radius of curvature of the object-side surface of the first lens.
  • the telephoto lens satisfies the conditional expression: 1 ⁇ R 1 /R 6 ⁇ 2;
  • R 1 represents the radius of curvature of the object-side surface of the first lens
  • R 6 represents the radius of curvature of the image-side surface of the third lens. Satisfying the above conditions can effectively improve the resolution of the edge of the telephoto lens.
  • the telephoto lens satisfies the conditional expression: 0 ⁇ CT 2 /CT 1 ⁇ 2;
  • CT 1 represents the center thickness of the first lens
  • CT 2 represents the center thickness of the second lens. Satisfying the above conditions can effectively shorten the total optical length of the telephoto lens and promote the miniaturization of the telephoto lens.
  • the telephoto lens satisfies the conditional expression: -5 ⁇ f 2 /f 1 ⁇ 5;
  • f 1 represents the focal length of the first lens
  • f 2 represents the focal length of the second lens.
  • the telephoto lens satisfies the conditional expression: -1 ⁇ f 3 /f ⁇ 0;
  • f 3 represents the focal length of the third lens
  • f represents the focal length of the telephoto lens.
  • the telephoto lens satisfies the conditional expression: -2 ⁇ (R 3 +R 4 )/(R 3 -R 4 ) ⁇ 5;
  • R 3 represents the radius of curvature of the object-side surface of the second lens
  • R 4 represents the radius of curvature of the image-side surface of the second lens.
  • the telephoto lens satisfies the conditional expression: -2 ⁇ R 4 /f 2 ⁇ 3;
  • R 4 represents the radius of curvature of the image-side surface of the second lens
  • f 2 represents the focal length of the second lens.
  • the object side surface of the first lens, the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, the object side surface of the third lens, and the third lens At least one of the image-side surfaces is aspherical, and a stop is provided between the object side and the first lens.
  • the aspherical surface allows the telephoto lens to obtain more control variables to reduce aberrations.
  • An embodiment of the present invention further provides a mobile terminal, the mobile terminal includes a telephoto lens provided in any of the foregoing embodiments, and the mobile terminal further includes an image sensor.
  • the image sensor is disposed on the imaging surface of the telephoto lens and is used to receive the output of the telephoto lens. And the electrical signal corresponding to the optical signal.
  • the surface shape of the aspherical surface of the telephoto lens satisfies the following equation:
  • z represents the distance of the surface from the vertex of the surface in the direction of the optical axis
  • c represents the curvature of the surface vertex
  • k represents the quadric surface coefficient
  • h represents the distance from the optical axis to the surface
  • B, C, D, E, F, G, H represents the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively.
  • the telephoto lens provided by the present invention can achieve a higher zoom ratio.
  • the variable magnification ratio refers to the ratio of the equivalent focal length of the telephoto lens and the equivalent focal length of the wide-angle lens under the premise of the same pixels.
  • the equivalent focal length ratio of the telephoto lens provided by the present invention and the conventional wide-angle lens is more than 8 times, that is, the telephoto lens provided by the present invention is used in combination with a conventional wide-angle lens to achieve a zoom of more than 8 times, which can better meet electronic products The demand for miniaturization and high-definition imaging.
  • each lens in the telephoto lens is different.
  • the parameter table in each embodiment refers to the parameter table in each embodiment.
  • FIG. 1 is a schematic structural diagram of a telephoto lens 10 according to a first embodiment of the present invention. From the object side to the image side, it includes: an aperture ST, a first lens L1, a second lens L2, and a third lens L3. Flat glass G1 and filter G2;
  • the first lens L1 has positive refractive power, the object-side surface S1 of the first lens L1 is convex and the image-side surface S2 is concave, the first lens L1 is made of glass, and the object-side surface S1 and image side of the first lens L1
  • the surfaces S2 are all aspherical; the second lens L2 has positive power, the object-side surface S3 of the second lens is convex and the image-side surface S4 is concave; the third lens L3 has negative power and the third lens L3 has an object
  • the side surface S5 is a convex surface and the image side surface S6 is a concave surface.
  • the aspheric surface parameters of the first lens in this embodiment are shown in Table 2.
  • FIG. 2 is a field curvature curve of the telephoto lens 10 in this embodiment
  • FIG. 3 is a spherical aberration chromatic aberration curve of the telephoto lens 10 on the axis
  • FIG. 4 is a lateral chromatic aberration curve of the telephoto lens 10. It can be seen from the figure that the field curvature, on-axis spherical aberration chromatic aberration, and lateral chromatic aberration field curvature distortion of the telephoto lens 10 of this embodiment are all corrected well.
  • FIG. 5 shows a structural diagram of a telephoto lens 20 provided by this embodiment.
  • the telephoto lens 20 in this embodiment is substantially the same as the telephoto lens 10 in the first embodiment, except that the second lens L2 of the telephoto lens 20 in this embodiment has negative refractive power, and the The object-side surface S3 and the image-side surface S4 of the two lenses L2 are both aspherical, and the curvature radius and material selection of each lens are different. For specific parameters of each lens, see Table 3.
  • FIG. 6 is a field curvature curve of the telephoto lens 20 in the embodiment
  • FIG. 7 is an on-axis spherical aberration chromatic aberration curve of the telephoto lens 20
  • FIG. 8 is a lateral chromatic aberration curve of the telephoto lens 20. It can be seen from the figure that the field curvature, on-axis spherical aberration chromatic aberration, and lateral chromatic aberration field curvature distortion of the telephoto lens 20 of this embodiment are all well corrected.
  • FIG. 9 shows a structural diagram of a telephoto lens 30 provided by this embodiment.
  • the telephoto lens 30 in this embodiment is substantially the same as the telephoto lens 10 in the first embodiment, except that the first lens L1 and the second lens L2 of the telephoto lens 30 in this embodiment form a cemented lens , And the second lens L2 has negative power, and the curvature radius and material selection of each lens are different. For specific parameters of each lens, see Table 5.
  • FIG. 10 is a field curvature curve of the telephoto lens 30 in this embodiment
  • FIG. 11 is an on-axis spherical aberration chromatic aberration curve of the telephoto lens 30
  • FIG. 12 is a lateral chromatic aberration curve of the telephoto lens 30. It can be seen from the figure that the field curvature, on-axis spherical aberration chromatic aberration, and lateral chromatic aberration field curvature distortion of the telephoto lens 30 of this embodiment are all well corrected.
  • FIG. 13 shows a structural diagram of a telephoto lens 40 provided by this embodiment.
  • the telephoto lens 40 in this embodiment is substantially the same as the telephoto lens 10 in the first embodiment, except that the image side of the second lens L2 of the telephoto lens 40 in this embodiment is convex, and each The curvature radius of the lens and the choice of materials are different. For the specific parameters of each lens, see Table 7.
  • FIG. 14 is a field curvature curve of the telephoto lens 40 in this embodiment
  • FIG. 15 is an on-axis spherical aberration chromatic aberration curve of the telephoto lens 40
  • FIG. 16 is a lateral chromatic aberration curve of the telephoto lens 40. It can be seen from the figure that the field curvature, on-axis spherical aberration chromatic aberration, and lateral chromatic aberration field curvature distortion of the telephoto lens 40 of this embodiment are all well corrected.
  • Table 9 is the optical characteristics of the telephoto lens in the above four embodiments, including the total optical length of the lens TTL, focal length f, aperture number F# and field angle 2 ⁇ , and corresponding to each of the aforementioned conditional expressions Related values.
  • the total optical length of the telephoto lens provided by the present invention exceeds 30mm, which is far more than the thickness of a mobile phone.
  • the lens can be designed as a periscope lens imaging system using a reflective optical surface and embedded in the mobile phone to meet thin and light electronics Product demand.
  • the equivalent focal length ratio of the two is more than 8 times, that is, the telephoto lens provided by the present invention Combined with a conventional wide-angle lens, it can achieve more than 8 times zoom, which can bring better zoom imaging effects and meet the needs of miniaturization of electronic products and high-definition imaging.
  • this embodiment provides a mobile terminal 100 including a telephoto lens (such as a telephoto lens 10) and an image sensor 50 in any of the foregoing embodiments.
  • the image sensor 50 is disposed on the telephoto lens 10
  • the imaging surface S11 is used to receive the optical signal output by the telephoto lens 10 and form an electrical signal corresponding to the optical signal.
  • the image sensor 50 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or a CCD (Charge Coupled Device) image sensor.
  • CMOS Complementary Metal Oxide Semiconductor
  • CCD Charge Coupled Device
  • the telephoto lens 10 provided by the present invention has a total optical length TTL of up to 34 mm, far exceeding the thickness of the mobile terminal 100.
  • the mobile terminal 100 further includes a first prism 61 and a second prism 62.
  • the first prism 61 is provided at the entrance of the telephoto lens
  • the second prism 62 is located at the exit of the telephoto lens 10, to design the telephoto lens 10 as a periscope lens imaging system (the incident light and the exit light are different planes) by using the prism reflection optical surface Vertical) to shorten the transmission distance of the optical path to meet the miniaturization requirements of the mobile terminal 100.
  • the first prism 61 causes the incident light (incident parallel to the paper surface) to turn into the telephoto lens 10, and the second prism 62 turns the light emitted by the telephoto lens 10 again to form an exit Light rays (outgoing perpendicular to the paper surface), the incident light rays and the outgoing light rays form a vertical relationship of different planes.
  • the mobile terminal 100 provided in this embodiment includes a telephoto lens 10, which can achieve a higher zoom ratio than a conventional telephoto lens, and can better meet the high-definition imaging needs of miniaturized electronic products.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
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Abstract

提供一种长焦镜头及移动终端，长焦镜头（10）从物侧到像侧依次包括：具有正光焦度的第一透镜（L1）、具有光焦度的第二透镜（L2）、具有负光焦度的第三透镜（L3）、平板玻璃（G1）和滤光片（G2）。第一透镜（L1）的物侧表面（S1）为凸面，第三透镜（L3）的像侧表面（S6）为凹面。移动终端（100）包括长焦镜头（10）及图像传感器（50），图像传感器（50）设置于长焦镜头（10）的成像面（S11），用于接收长焦镜头（10）输出的光信号并形成与光信号对应的电信号。这种长焦镜头（10）及移动终端（100），相比常规的长焦镜头可实现更高的变倍比，能够更好的满足电子产品的小型化及高清成像需求。

Description

长焦镜头及移动终端 技术领域
本发明涉及光学镜头技术领域，特别涉及一种长焦镜头及移动终端。
背景技术
近年来，随着人们对便携式电子产品成像质量的追求，双摄像头已经成了手机产品的标配。为了达到高质量的成像效果，大多数手机采用了“定焦双摄”的解决方案，也就是广角镜头+长焦镜头的组合，既能进行广角拍摄，也能在远景拍摄时将景物清晰的放大，从而使手机也能拍摄出与单反相机相媲美的效果。
现有的双摄像头产品中，常规的长焦镜头和广角镜头的等效焦距比在3～5倍之间，组合搭配使用可使变倍比达到3～5倍，与传统的变焦镜头相比变倍太小，难以满足便携式电子产品的小型化及高清成像需求。
发明内容
本发明的目的在于提供一种长焦镜头及移动终端，以解决上述问题。
本发明实施例通过以下技术方案来实现上述目的。
第一方面，本发明提供一种长焦镜头，从物侧到像侧依次包括：具有正光焦度的第一透镜、具有光焦度的第二透镜、具有负光焦度的第三透镜、平板玻璃和滤光片。第一透镜的物侧表面为凸面，第三透镜的像侧表面为凹面。
第二方面，本发明提供一种移动终端，移动终端包括长焦镜头及图像传感器，图像传感器设置于长焦镜头的成像面，用于接收长焦镜头输出的光信号并形成与光信号对应的电信号。
相较于现有技术，本发明提供的长焦镜头及移动终端可实现更高的变倍比，本发明提供的长焦镜头和常规的广角镜头的等效焦距比在8倍以上，即本发明提供的长焦镜头搭配常规的广角镜头组合使用，可以实现8倍以上变焦，能够更好的满足电子产品的小型化及高清成像需求。
本发明的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例的描述中将变得明显和容易理解，其中：
图1为本发明第一实施例中长焦镜头的结构示意图。
图2为本发明第一实施例中长焦镜头的场曲曲线图。
图3为本发明第一实施例中长焦镜头的轴上点球差曲线图。
图4为本发明第一实施例中长焦镜头的横向色差曲线图。
图5为本发明第二实施例中长焦镜头的结构示意图。
图6为本发明第二实施例中长焦镜头的场曲曲线图。
图7为本发明第二实施例中长焦镜头的轴上点球差曲线图。
图8为本发明第二实施例中长焦镜头的横向色差曲线图。
图9为本发明第三实施例中长焦镜头的结构示意图。
图10为本发明第三实施例中长焦镜头的场曲曲线图。
图11为本发明第三实施例中长焦镜头的轴上点球差曲线图。
图12为本发明第三实施例中长焦镜头的横向色差曲线图。
图13为本发明第四实施例中长焦镜头的结构示意图。
图14为本发明第四实施例中长焦镜头的场曲曲线图。
图15为本发明第四实施例中长焦镜头的轴上点球差曲线图。
图16为本发明第四实施例中长焦镜头的横向色差曲线图。
图17为本发明第五实施例中移动终端的结构示意图。
图18为图17的俯视图。
主要元素符号说明
光阑 ST 第一透镜 L1
第二透镜 L2 第三透镜 L3
平板玻璃 G1 滤光片 G2
如下具体实施方式将结合上述附图进一步说明本发明。
具体实施方式
为使本发明的目的、特征和优点能够更加明显易懂，下面结合附图对本发明的具体实施方式做详细的说明。附图中给出了本发明的若干实施例。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本发明的公开内容更加透彻全面。
本发明实施例提供一种长焦镜头，从物侧到像侧依次包括：具有正光焦度的第一透镜、具有光焦度的第二透镜、具有负光焦度的第三透镜、平板玻璃和滤光片。第一透镜的物侧表面为凸面，第三透镜的像侧表面为凹面。
在一种实施方式中，长焦镜头满足条件式：0.75<TTL/f<2.0；
其中，TTL表示长焦镜头的光学总长，f表示长焦镜头的焦距。满足上述条件可有效地缩短镜头的光学总长，促进镜头的小型化。
在一种实施方式中，平板玻璃满足条件式：N d4>1.8；
其中，N d4表示平板玻璃的折射率。平板玻璃采用高折射率的材质，便于光线的入射。
在一种实施方式中，第一透镜采用玻璃材质。由于玻璃材质的耐温效果更好，且性能更稳定，第一透镜采用玻璃材质可以有效实现镜头的消热差。
在一种实施方式中，长焦镜头满足条件式：3<f/R 1<5；
其中，f表示长焦镜头的焦距，R 1表示第一透镜物侧表面的曲率半径。当f/R 1的值超过下限，则第一透镜的屈折力变大，不利于确保周边性能，偏芯敏感度变大；当f/R 1的值超过上限，镜头的色差修正比较困难。
在一种实施方式中，长焦镜头满足条件式：1<R 1/R 6<2；
其中，R 1表示第一透镜物侧表面的曲率半径，R 6表示第三透镜像侧表面的曲率半径。满足上述条件，可有效的提升长焦镜头的边缘的解像能力。
在一种实施方式中，长焦镜头满足条件式：0<CT 2/CT 1<2；
其中，CT 1表示第一透镜的中心厚度，CT 2表示第二透镜的中心厚度。满足上述条件，可有效地缩短长焦镜头的光学总长，促进长焦镜头小型化。
在一种实施方式中，长焦镜头满足条件式：-5＜f 2/f 1＜5；
其中，f 1表示第一透镜的焦距，f 2表示第二透镜的焦距。当f 2/f 1的值超过下限，屈折力变大，偏芯敏感度变大；当f 2/f 1的值超过上限，屈折力变小，不利于维持小型化。
在一种实施方式中，长焦镜头满足条件式：-1＜f 3/f＜0；
其中，f 3表示第三透镜的焦距，f表示长焦镜头的焦距。当f 3/f的值超过下限，对于轴外光线，将会发生高阶像差，性能恶化；当f 3/f的值超过上限，场曲、慧差的修正比较困难，偏芯敏感度变大。
在一种实施方式中，长焦镜头满足条件式：-2<(R 3+R 4)/(R 3-R 4)<5；
其中，R 3表示第二透镜物侧表面的曲率半径，R 4表示第二透镜像侧表面的曲率半径。当(R 3+R 4)/(R 3-R 4)的值超过上限时，场曲和畸变朝正方向过分增大，校正困难。相反，当(R 3+R 4)/(R 3-R 4)的值超过下限时，场曲和畸变朝负方向过分增大，校正困难。
在一种实施方式中，长焦镜头满足条件式：-2＜R 4/f 2＜3；
其中，R 4表示第二透镜像侧表面的曲率半径，f 2表示第二透镜的焦距。当R 4/f 2的值超过下限，R 4的屈折力变大，不利于确保周边性能，偏芯敏感度变大；当R 4/f 2的值超过上限，场曲的修正比较困难。
在一种实施方式中，第一透镜的物侧表面、第一透镜的像侧表面、第二透镜的物侧表面、第二透镜的像侧表面、第三透镜的物侧表面以及第三透镜的像侧表面中至少有一个面为非球面，且物侧与第一透镜之间设置有光阑。非球面表面可以使长焦镜头获得较多的控制变数，以削减像差。
本发明实施例还提供一种移动终端，移动终端包括上述任一实施方式提供的长焦镜头，移动终端还包括图像传感器，图像传感器设置于长焦镜头的成像面，用于接收长焦镜头输出的光信号并形成与光信号对应的电信号。
本发明中各个实施例中长焦镜头的非球面的表面形状均满足下列方程：
Figure PCTCN2019127517-appb-000001
其中，z表示曲面离开曲面顶点在光轴方向的距离，c表示曲面顶点的曲率，k表示二次曲面系数，h表示光轴到曲面的距离，B、C、D、E、F、G、H分别表示四阶、六阶、八阶、十阶、十二阶、十四阶、十六阶曲面系数。
本发明提供的长焦镜头和常规的长焦镜头相比，可实现更高的变倍比。其中，变倍比是指在像素相同的前提下，长焦镜头的等效焦距与广角镜头的等效焦距的比值。等效焦距＝实际焦距*焦距转换系数；焦距转换系数＝43.3/图像传感器靶面对角线长度。
本发明提供的长焦镜头和常规的广角镜头的等效焦距比在8倍以上，即本发明提供的长焦镜头搭配常规的广角镜头组合使用，可以实现8倍以上变焦，能够更好的满足电子产品的小型化及高清成像需求。
下面分多个实施例对本发明进行进一步的说明。在以下每个实施例中，长焦镜头中的各个透镜的厚度、曲率半径有所不同，具体不同可参见各实施例中的参数表。
第一实施例
如图1所示为本发明第一实施例提供的长焦镜头10的结构示意图，从物侧到像侧依次包括：光阑ST、第一透镜L1、第二透镜L2、第三透镜L3、平板玻璃G1和滤光片G2；
其中，第一透镜L1具有正光焦度，第一透镜L1的物侧表面S1为凸面且像侧表面S2为凹面，第一透镜L1采用玻璃材质，第一透镜L1的物侧表面S1和像侧表面S2均为非球面；第二透镜L2具有正光焦度，第二透镜的物侧表面S3为凸面且像侧表面S4为凹面；第三透镜L3具有负光焦度，第三透镜L3的物侧表面S5为凸面且像侧表面S6为凹面。
本发明第一实施例中提供的长焦镜头10中各个镜片的相关参数如表1所示。
表1
Figure PCTCN2019127517-appb-000002
Figure PCTCN2019127517-appb-000003
本实施例的第一透镜的非球面参数如表2所示。
表2
Figure PCTCN2019127517-appb-000004
图2为本实施例中长焦镜头10的场曲曲线，图3为长焦镜头10的轴上点球差色差曲线，图4为长焦镜头10的横向色差曲线。从图上可以看出，本实施例的长焦镜头10的场曲、轴上点球差色差、横向色差场曲畸变都被良好校正。
第二实施例
请参阅图5，所示为本实施例提供的一种长焦镜头20的结构图。本实施例当中的长焦镜头20与第一实施例当中的长焦镜头10大抵相同，不同之处在于：本实施例当中的长焦镜头20的第二透镜L2具有负光焦度，且第二透镜L2的物侧表面S3和像侧表面S4均为非球面，以及各透镜的曲率半径、材料选择不同，具体各个透镜的相关参数参见表3所示。
表3
Figure PCTCN2019127517-appb-000005
Figure PCTCN2019127517-appb-000006
本实施例的各透镜非球面的参数如表4所示。
表4
Figure PCTCN2019127517-appb-000007
图6为本实施例中长焦镜头20的场曲曲线，图7为长焦镜头20的轴上点球差色差曲线，图8为长焦镜头20的横向色差曲线。从图上可以看出，本实施例的长焦镜头20的场曲、轴上点球差色差、横向色差场曲畸变都被良好校正。
第三实施例
请参阅图9，所示为本实施例提供的一种长焦镜头30的结构图。本实施例当中的长焦镜头30与第一实施例当中的长焦镜头10大抵相同，不同之处在于：本实施例当中的长焦镜头30 的第一透镜L1与第二透镜L2组成胶合透镜，且第二透镜L2具有负光焦度，以及各透镜的曲率半径、材料选择不同，具体各个透镜的相关参数参见表5所示。
表5
Figure PCTCN2019127517-appb-000008
本实施例的各透镜非球面的参数如表6所示。
表6
Figure PCTCN2019127517-appb-000009
图10为本实施例中长焦镜头30的场曲曲线，图11为长焦镜头30的轴上点球差色差曲线，图12为长焦镜头30的横向色差曲线。从图上可以看出，本实施例的长焦镜头30的场曲、轴上点球差色差、横向色差场曲畸变都被良好校正。
第四实施例
请参阅图13，所示为本实施例提供的一种长焦镜头40的结构图。本实施例当中的长焦镜 头40与第一实施例当中的长焦镜头10大抵相同，不同之处在于：本实施例当中的长焦镜头40的第二透镜L2的像侧面为凸面，以及各透镜的曲率半径、材料选择不同，具体各个透镜的相关参数参见表7所示。
表7
Figure PCTCN2019127517-appb-000010
本实施例的各透镜非球面的参数如表8所示。
表8
Figure PCTCN2019127517-appb-000011
图14为本实施例中长焦镜头40的场曲曲线，图15为长焦镜头40的轴上点球差色差曲线，图16为长焦镜头40的横向色差曲线。从图上可以看出，本实施例的长焦镜头40的场曲、轴上点球差色差、横向色差场曲畸变都被良好校正。
请参阅表9，表9为上述四个实施例中的长焦镜头的光学特性，包括镜头的光学总长TTL、焦距f、光圈数F#和视场角2θ，以及与前述的每个条件式对应的相关数值。
表9
条件式 第一实施例 第二实施例 第三实施例 第四实施例
TTL 34.045 34.093 33.950 34.075
f 31.000 31.000 31.004 31.000
F# 3.6 3.6 3.6 3.6
2θ 8° 8° 8° 8°
TTL/f 1.098 1.100 1.095 1.099
f/R 1 4.348 3.976 4.117 4.221
R 1/R 6 1.354 1.367 1.429 1.352
CT 2/CT 1 1.035 0.261 0.224 0.517
f 2/f 1 0.677 -3.037 -3.196 3.929
f 3/f -0.481 -0.886 -0.565 -0.473
(R 3+R 4)/(R 3-R 4) -1.611 3.477 3.814 -0.386
R 4/f 2 2.327 -0.238 -0.724 -1.966
本发明提供的长焦镜头的光学总长超过30mm，远超手机的厚度，当用于手机上时，可利用反射光学面将镜头设计成潜望式镜头成像系统，嵌入手机，以满足轻薄式电子产品的需求。
本发明提供的长焦镜头的焦距f可达31mm，与该长焦镜头匹配的图像传感器的对角线长度为5mm，利用等效焦距的计算方法可得：(1)焦距转换系数＝43.3/图像传感器靶面对角线长度＝43.3/5＝8.66；(2)等效焦距＝实际焦距*焦距转换系数＝31*8.66＝268.46mm。因此，本发明提供的长焦镜头等效焦距可达268mm。一般常规的广角镜头的等效焦距通常在20～30mm，那么本发明提供的长焦镜头与常规的广角镜头组合使用后，两者的等效焦距比在8倍以上，即本发明提供的长焦镜头搭配常规的广角镜头组合使用，可以实现8倍以上变焦，能够带来更好的变焦成像效果，满足电子产品的小型化及高清成像需求。
第五实施例
请参阅图17和图18，本实施例提供一种移动终端100，包括上述任一实施例中的长焦镜 头(例如长焦镜头10)及图像传感器50，图像传感器50设置于长焦镜头10的成像面S11，用于接收长焦镜头10输出的光信号并形成与光信号对应的电信号。
图像传感器50可以是CMOS(Complementary Metal Oxide Semiconductor，互补性金属氧化物半导体)图像传感器，还可以是CCD(Charge Coupled Device，电荷耦合器件)图像传感器。
本发明提供的长焦镜头10的光学总长TTL可达34mm，远超移动终端100的厚度，当设置于移动终端100时，移动终端100还包括第一棱镜61和第二棱镜62，第一棱镜61设置于长焦镜头的入射口，第二棱镜62位于长焦镜头10的出射口，以利用棱镜反射光学面将长焦镜头10设计成潜望式镜头成像系统(入射光线和出射光线异面垂直)，以缩短光路的传输距离，满足移动终端100的小型化要求。
具体地，以图17的视角所示，第一棱镜61使得入射光线(平行于纸面入射)转折后进入长焦镜头10，第二棱镜62对长焦镜头10射出的光线再次转折后形成出射光线(垂直于纸面向内出射)，入射光线和出射光线形成异面垂直的关系。
本实施例提供的移动终端100，包括长焦镜头10，相比常规的长焦镜头可实现更高的变倍比，能够更好的满足小型化电子产品的高清成像需求。
以上实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (14)

  1. 一种长焦镜头，其特征在于，从物侧到像侧依次包括：
    具有正光焦度的第一透镜，所述第一透镜的物侧表面为凸面；
    具有光焦度的第二透镜；
    具有负光焦度的第三透镜，所述第三透镜的像侧表面为凹面；
    平板玻璃；以及
    滤光片。
  2. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    0.75<TTL/ <2.0；
    其中，TTL表示所述长焦镜头的光学总长，f表示所述长焦镜头的焦距。
  3. 根据权利要求1所述的长焦镜头，其特征在于，所述平板玻璃满足条件式：
    N d4>1.8；
    其中，N d4表示所述平板玻璃的折射率。
  4. 根据权利要求1所述的长焦镜头，其特征在于，所述第一透镜采用玻璃材质。
  5. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    3<f/R 1<5；
    其中，f表示所述长焦镜头的焦距，R 1表示所述第一透镜物侧表面的曲率半径。
  6. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    1<R 1/R 6<2；
    其中，R 1表示所述第一透镜物侧表面的曲率半径，R 6表示所述第三透镜像侧表面的曲率半径。
  7. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    0<CT 2/CT 1<2；
    其中，CT 1表示所述第一透镜的中心厚度，CT 2表示所述第二透镜的中心厚度。
  8. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    -5＜f 2/f 1＜5；
    其中，f 1表示所述第一透镜的焦距，f 2表示所述第二透镜的焦距。
  9. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    -1＜f 3/f＜0；
    其中，f 3表示所述第三透镜的焦距，f表示所述长焦镜头的焦距。
  10. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    -2<(R 3+R 4)/(R 3-R 4)<5；
    其中，R 3表示所述第二透镜物侧表面的曲率半径，R 4表示所述第二透镜像侧表面的曲率半径。
  11. 根据权利要求1所述的长焦镜头，其特征在于，所述长焦镜头满足条件式：
    -2＜R 4/f 2＜3；
    其中，R 4表示所述第二透镜像侧表面的曲率半径，f 2表示所述第二透镜的焦距。
  12. 根据权利要求1所述的长焦镜头，其特征在于，所述第一透镜的物侧表面、所述第一透镜的像侧表面、所述第二透镜的物侧表面、所述第二透镜的像侧表面、所述第三透镜的物侧表面以及所述第三透镜的像侧表面中至少有一个面为非球面，且所述物侧与所述第一透镜之间设置有光阑。
  13. 一种移动终端，其特征在于，包括如权利要求1-12任一项所述的长焦镜头及图像传感器，所述图像传感器设置于所述长焦镜头的成像面，用于接收所述长焦镜头输出的光信号并形成与所述光信号对应的电信号。
  14. 如权利要求13所述的移动终端，其特征在于，所述移动终端还包括第一棱镜和第二棱镜，所述第一棱镜设置于所述长焦镜头的入射口，所述第二棱镜设置于所述长焦镜头的出射口，所述第一棱镜将入射光线转折后进入所述长焦镜头，所述第二棱镜对光线再次转折后形成出射光线，所述入射光线和所述出射光线异面垂直。
PCT/CN2019/127517 2019-01-03 2019-12-23 长焦镜头及移动终端 Ceased WO2020140788A1 (zh)

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