WO2021184276A1 - Lentille optique de caméra - Google Patents

Lentille optique de caméra Download PDF

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Publication number
WO2021184276A1
WO2021184276A1 PCT/CN2020/080111 CN2020080111W WO2021184276A1 WO 2021184276 A1 WO2021184276 A1 WO 2021184276A1 CN 2020080111 W CN2020080111 W CN 2020080111W WO 2021184276 A1 WO2021184276 A1 WO 2021184276A1
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WO
WIPO (PCT)
Prior art keywords
lens
imaging optical
curvature
optical lens
radius
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PCT/CN2020/080111
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English (en)
Chinese (zh)
Inventor
卞旭琪
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诚瑞光学(常州)股份有限公司
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Priority to PCT/CN2020/080111 priority Critical patent/WO2021184276A1/fr
Publication of WO2021184276A1 publication Critical patent/WO2021184276A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • 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

Definitions

  • the present invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as imaging devices such as monitors and PC lenses.
  • the lenses traditionally mounted on mobile phone cameras mostly adopt a three-element or four-element lens structure.
  • the pixel area of the photosensitive device continues to shrink, and the system's requirements for image quality continue to increase, the five-element lens structure gradually appears in the lens design, and it is common Although the five-element lens has good optical performance, its optical power, lens spacing and lens shape settings are still unreasonable, resulting in the lens structure having good optical performance, but cannot meet the requirements of wide-angle, wide-angle, Ultra-thin design requirements.
  • the purpose of the present invention is to provide an imaging optical lens, which aims to solve the problems of insufficient large aperture, wide-angle, and ultra-thinning of the traditional imaging optical lens.
  • an imaging optical lens from the object side to the image side, including: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, The fourth lens with positive refractive power and the fifth lens with negative refractive power;
  • the radius of curvature of the object side of the second lens is R3
  • the radius of curvature of the image side of the second lens is R4
  • the radius of curvature of the object side of the third lens is R5
  • the radius of curvature of the third lens is R5.
  • the radius of curvature of the image side surface is R6, the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, and the distance between the image side surface of the third lens and the object side surface of the fourth lens
  • the on-axis distance is d6, the image height of the imaging optical lens is IH, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 1.50 ⁇ (R5+R6)/(R5-R6); 0.40 ⁇ d4/d6 ⁇ 1.25; 1.00 ⁇ TTL/IH ⁇ 1.30; 1.00 ⁇ (R3+R4)/(R3-R4) ⁇ 2.40.
  • the overall focal length of the imaging optical lens is f
  • the focal length of the first lens is f1
  • the following relationship is satisfied: 0.80 ⁇ f1/f ⁇ 1.10.
  • the curvature radius of the object side surface of the first lens is R1
  • the curvature radius of the image side surface of the first lens is R2
  • the axial thickness of the first lens is d1
  • the following relationship is satisfied:- 5.03 ⁇ (R1+R2)/(R1-R2) ⁇ -1.44; 0.05 ⁇ d1/TTL ⁇ 0.19.
  • the overall focal length of the imaging optical lens is f
  • the focal length of the second lens is f2
  • the axial thickness of the second lens is d3, and the following relationship is satisfied: -15.67 ⁇ f2/f ⁇ - 3.12; 0.02 ⁇ d3/TTL ⁇ 0.09.
  • the overall focal length of the imaging optical lens is f
  • the focal length of the third lens is f3
  • the axial thickness of the third lens is d5
  • the following relationship is satisfied: -957.13 ⁇ f3/f ⁇ - 4.74; 0.03 ⁇ d5/TTL ⁇ 0.09.
  • the overall focal length of the imaging optical lens is f
  • the focal length of the fourth lens is f4
  • the radius of curvature of the object side of the fourth lens is R7
  • the radius of curvature of the image side of the fourth lens is R8, the on-axis thickness of the fourth lens is d7, and satisfies the following relationship: 0.28 ⁇ f4/f ⁇ 1.11; 0.83 ⁇ (R7+R8)/(R7-R8) ⁇ 2.73; 0.07 ⁇ d7/TTL ⁇ 0.47.
  • the overall focal length of the imaging optical lens is f
  • the focal length of the fifth lens is f5
  • the radius of curvature of the object side of the fifth lens is R9
  • the radius of curvature of the image side of the fifth lens is R10
  • the on-axis thickness of the fifth lens is d9, and satisfies the following relationship: -1.22 ⁇ f5/f ⁇ -0.31; 0.30 ⁇ (R9+R10)/(R9-R10) ⁇ 0.99; 0.03 ⁇ d9/ TTL ⁇ 0.13.
  • the aperture F number of the imaging optical lens is FNO, and the following relational expression is satisfied: FNO ⁇ 2.25.
  • the field of view of the imaging optical lens is FOV, and satisfies the following relationship: FOV ⁇ 83°.
  • the overall focal length of the imaging optical lens is f
  • the combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied: 0.46 ⁇ f12/f ⁇ 1.79.
  • the camera optical lens provided by the present invention meets the design requirements of large aperture, wide-angle and ultra-thin, while having good optical performance, and is particularly suitable for mobile phone camera lens components and camera lens components composed of high-pixel CCD, CMOS and other imaging elements. WEB camera lens.
  • FIG. 1 is a schematic diagram of the structure of the imaging optical lens of the first embodiment
  • FIG. 2 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 1;
  • FIG. 3 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 1;
  • FIG. 4 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 1;
  • FIG. 5 is a schematic diagram of the structure of the imaging optical lens of the second embodiment
  • FIG. 6 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 5;
  • FIG. 7 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 5;
  • FIG. 8 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 5;
  • FIG. 9 is a schematic diagram of the structure of an imaging optical lens of the third embodiment.
  • FIG. 10 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 9;
  • FIG. 11 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 9;
  • FIG. 12 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 9.
  • the present invention provides an imaging optical lens 10 according to a first embodiment.
  • the left side is the object side
  • the right side is the image side.
  • the imaging optical lens 10 mainly includes five lenses. From the object side to the image side, they are the aperture S1, the first lens L1, the second lens L2, and the third lens. Lens L3, fourth lens L4, and fifth lens L5.
  • a glass plate GF is provided between the fifth lens L5 and the image plane Si.
  • the glass plate GF may be a glass cover plate or an optical filter.
  • the first lens L1 is made of plastic material
  • the second lens L2 is made of plastic material
  • the third lens L3 is made of plastic material
  • the fourth lens L4 is made of plastic material
  • the fifth lens L5 is made of plastic material.
  • the curvature radius of the object side surface of the second lens L2 as R3, the curvature radius of the image side surface of the second lens L2 as R4, the curvature radius of the object side surface of the third lens L3 as R5, and the image side surface of the third lens L3
  • the radius of curvature of is R6, the on-axis distance from the image side of the second lens L2 to the object side of the third lens L3 is d4, and the on-axis distance from the image side of the third lens L3 to the object side of the fourth lens L4 is d6,
  • the image height of the camera optical lens 10 is IH
  • the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship:
  • conditional formula (1) specifies the shape of the third lens. Within the range specified by the conditional formula, the degree of deflection of the light passing through the lens can be alleviated, and aberrations can be effectively reduced.
  • the position of the third lens can be effectively allocated, which is beneficial to improve the imaging quality.
  • Conditional formula (3) stipulates the ratio of the total length of the system to the image height, and the system within the conditional range has the characteristics of ultra-thin.
  • conditional expression (4) specifies the shape of the second lens, which helps to improve the image quality within the conditional range.
  • the focal length of the imaging optical lens 10 Defines the overall focal length of the imaging optical lens 10 as f, and the focal length of the first lens L1 as f1, which satisfies the following relationship: 0.80 ⁇ f1/f ⁇ 1.10.
  • the focal length of the first lens can be effectively allocated, Correct the aberration of the optical system to improve the image quality.
  • the first lens L1 has a positive refractive power
  • the object side surface is convex at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the axial thickness of the first lens L1 is d1
  • the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational expression: 0.05 ⁇ d1/TTL ⁇ 0.19.
  • 0.09 ⁇ d1/TTL ⁇ 0.15 is satisfied.
  • the second lens L2 has a negative refractive power
  • the object side surface is convex at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the overall focal length of the imaging optical lens 10 as f
  • the focal length of the second lens L2 as f2
  • f2 the focal length of the second lens L2
  • it satisfies -9.80 ⁇ f2/f ⁇ -3.90.
  • the axial thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relational expression: 0.02 ⁇ d3/TTL ⁇ 0.09. Within the range of the conditional expression, it is beneficial to realize ultra-thinness. Preferably, 0.04 ⁇ d3/TTL ⁇ 0.07 is satisfied.
  • the third lens L3 has a negative refractive power
  • the object side surface is convex at the paraxial position
  • the image side surface is concave at the paraxial position.
  • the system has better Image quality and lower sensitivity. Preferably, it satisfies -598.21 ⁇ f3/f ⁇ -5.92.
  • the axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.03 ⁇ d5/TTL ⁇ 0.09. Within the range of the conditional expression, it is beneficial to realize ultra-thinness. Preferably, 0.04 ⁇ d5/TTL ⁇ 0.08 is satisfied.
  • the fourth lens L4 has a positive refractive power
  • the object side surface is concave at the paraxial position
  • the image side surface is convex at the paraxial position.
  • the focal length of the fourth lens L4 as f4
  • the overall focal length of the imaging optical lens 10 as f, which satisfies the following relationship: 0.28 ⁇ f4/f ⁇ 1.11, which specifies the ratio of the focal length of the fourth lens to the focal length of the system, which is within the range of the conditional expression Helps improve the performance of the optical system.
  • 0.45 ⁇ f4/f ⁇ 0.89 is satisfied.
  • the axial thickness of the fourth lens L4 is d7, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.07 ⁇ d7/TTL ⁇ 0.47.
  • TTL total optical length of the imaging optical lens 10
  • 0.07 ⁇ d7/TTL ⁇ 0.47 Within the range of the conditional expression, it is beneficial to achieve ultra-thinness. Preferably, 0.11 ⁇ d7/TTL ⁇ 0.38 is satisfied.
  • the radius of curvature of the object side surface of the fifth lens L5 is R9
  • the radius of curvature of the image side surface of the fifth lens L5 is R10
  • the following relationship is satisfied: 0.30 ⁇ (R9+R10)/(R9-R10) ⁇ 0.99, which specifies the fifth
  • 0.47 ⁇ (R9+R10)/(R9-R10) ⁇ 0.79 is satisfied.
  • the on-axis thickness of the fifth lens L5 is d9, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.03 ⁇ d9/TTL ⁇ 0.13. Within the range of the conditional expression, it is beneficial to realize ultra-thinness. Preferably, 0.06 ⁇ d9/TTL ⁇ 0.10 is satisfied.
  • the aperture F number FNO of the overall imaging optical lens 10 is less than or equal to 2.25, thereby achieving a large aperture.
  • the overall focal length of the imaging optical lens 10 is f
  • the combined focal length of the first lens L1 and the second lens L2 is f12, which satisfies the following relational expression: 0.46 ⁇ f12/f ⁇ 1.79.
  • the aberration and distortion of the imaging optical lens 10 are eliminated, and the back focal length of the imaging optical lens 10 can be suppressed to maintain the miniaturization of the imaging lens system group.
  • 0.74 ⁇ f12/f ⁇ 1.43 is satisfied.
  • the imaging optical lens 10 can be reasonable The power, spacing, and shape of each lens are allocated, and various aberrations are corrected accordingly.
  • the imaging optical lens 10 of the present invention will be described below with an example.
  • the symbols described in each example are as follows.
  • the unit of focal length, distance on axis, radius of curvature, thickness on axis, position of inflection point, and position of stagnation point is mm.
  • TTL Total optical length (the on-axis distance from the object side of the first lens L1 to the image plane Si), the unit is mm.
  • At least one of the object side surface and the image side surface of each lens may also be provided with an inflection point and/or a stagnation point to meet high-quality imaging requirements.
  • an inflection point and/or a stagnation point may also be provided with an inflection point and/or a stagnation point to meet high-quality imaging requirements.
  • the design data of the imaging optical lens 10 shown in FIG. 1 is shown below.
  • R3 the radius of curvature of the object side surface of the second lens L2;
  • R4 the radius of curvature of the image side surface of the second lens L2;
  • R5 the radius of curvature of the object side surface of the third lens L3;
  • R6 the radius of curvature of the image side surface of the third lens L3;
  • R7 the radius of curvature of the object side of the fourth lens L4;
  • R8 the radius of curvature of the image side surface of the fourth lens L4;
  • R9 the radius of curvature of the object side surface of the fifth lens L5;
  • R10 the radius of curvature of the image side surface of the fifth lens L5;
  • R11 the radius of curvature of the object side of the optical filter GF
  • R12 the radius of curvature of the image side surface of the optical filter GF
  • d0 the on-axis distance from the aperture S1 to the object side of the first lens L1;
  • d2 the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;
  • d10 the on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the optical filter GF;
  • d11 the axial thickness of the optical filter GF
  • d12 the on-axis distance from the image side surface of the optical filter GF to the image surface
  • nd refractive index of d-line
  • ndg the refractive index of the d-line of the optical filter GF
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, and A16 are the aspheric coefficients.
  • the aspheric surface of each lens surface uses the aspheric surface shown in the above formula (5).
  • the present invention is not limited to the aspheric polynomial form represented by the formula (5).
  • the first embodiment satisfies various conditional expressions.
  • FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 10.
  • the curvature of field S in FIG. 4 is the curvature of field in the sagittal direction
  • T is the curvature of field in the meridional direction.
  • FIG. 5 is a schematic diagram of the structure of the imaging optical lens 20 in the second embodiment.
  • the second embodiment is basically the same as the first embodiment.
  • the meanings of the symbols in the following list are also the same as those in the first embodiment, so the same parts will not be omitted here. To repeat, only the differences are listed below.
  • Table 6 shows the aspheric surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.
  • Table 7 and Table 8 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20.
  • FIG. 6 and 7 respectively show schematic diagrams of the axial aberration and the chromatic aberration of magnification after the light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the imaging optical lens 20.
  • FIG. 8 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 20.
  • the curvature of field S in FIG. 8 is the curvature of field in the sagittal direction, and T is the curvature of field in the meridional direction.
  • the entrance pupil diameter of the imaging optical lens 20 is 1.100mm, the full-field image height is 2.92mm, and the diagonal field angle is 95.00°, so that the imaging optical lens 20 has a large aperture and a wide angle.
  • Ultra-thin, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.
  • Table 9 and Table 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.
  • Table 10 shows the aspheric surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.
  • FIG. 10 and 11 respectively show schematic diagrams of the axial aberration and the chromatic aberration of magnification after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm pass through the imaging optical lens 30.
  • FIG. 12 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 30.
  • the curvature of field S in FIG. 12 is the curvature of field in the sagittal direction
  • T is the curvature of field in the meridional direction.
  • Table 13 lists the values of the corresponding conditional expressions in the first embodiment, the second embodiment, and the third embodiment according to the above conditional expressions, as well as the values of other related parameters.
  • Example 1 Example 2
  • Example 3 (R5+R6)/(R5-R6) 12.07 100.54 1.51 d4/d6 0.65 0.42 1.24 TTL/IH 1.09 1.01 1.28 (R3+R4)/(R3-R4) 1.48 1.03 2.35 f 2.802 2.453 2.987 f1 2.526 2.600 2.485 f2 -13.104 -19.224 -18.759 f3 -48.340 -1173.919 -21.218 f4 1.961 1.813 1.683 f5 -1.559 -1.494 -1.396 f12 2.968 2.920 2.760 Fno 2.23 2.23 2.23

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

L'invention concerne une lentille optique de caméra (10), comprenant les éléments suivants du côté objet au côté image : une première lentille (L1), une deuxième lentille (L2), une troisième lentille (L3), une quatrième lentille (L4) et une cinquième lentille (L5) ; le rayon de courbure d'une surface côté objet de la deuxième lentille (L2) est R3, le rayon de courbure d'une surface côté image de la deuxième lentille (L2) est R4, le rayon de courbure d'une surface côté objet de la troisième lentille (L3) est R5, et le rayon de courbure d'une surface côté image de la troisième lentille (L3) est R6 ; la distance sur l'axe à partir de la surface côté image de la deuxième lentille (L2) à la surface côté objet de la troisième lentille (L3) est d4, et la distance sur l'axe à partir de la surface côté image de la troisième lentille (L3) à la surface côté objet de la quatrième lentille (L4) est d6 ; la hauteur d'image de la lentille optique de caméra (10) est IH, et la longueur optique totale de la lentille optique de caméra (10) est TTL. Les relations suivantes sont satisfaites : 1,50≤(R5+R6)/(R5-R6) ; 0,40≤d4/d6≤1,25 ; 1,00≤TTL/IH≤1,30 ; et 1,00≤(R3+R4)/(R3-R4)≤2,40. La lentille optique de caméra (10) satisfait les exigences de conception d'avoir une grande ouverture, d'avoir un grand-angle et d'être ultra-mince tout en présentant une bonne performance optique.
PCT/CN2020/080111 2020-03-19 2020-03-19 Lentille optique de caméra WO2021184276A1 (fr)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103091817A (zh) * 2011-11-07 2013-05-08 大立光电股份有限公司 摄影系统
US20160195700A1 (en) * 2009-07-14 2016-07-07 Largan Precision Co., Ltd. Imaging lens system
CN106680974A (zh) * 2017-02-17 2017-05-17 浙江舜宇光学有限公司 摄像镜头
US20180052302A1 (en) * 2016-08-22 2018-02-22 Kinko-Optical Co., Ltd. Five-piece wide-angle lens module
CN110007442A (zh) * 2019-05-08 2019-07-12 瑞声光电科技（苏州）有限公司 摄像光学镜头
CN110412736A (zh) * 2019-06-30 2019-11-05 瑞声科技(新加坡)有限公司 摄像光学镜头
CN110501806A (zh) * 2019-08-16 2019-11-26 瑞声通讯科技(常州)有限公司 摄像光学镜头
CN110515182A (zh) * 2019-08-19 2019-11-29 瑞声通讯科技(常州)有限公司 摄像光学镜头

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160195700A1 (en) * 2009-07-14 2016-07-07 Largan Precision Co., Ltd. Imaging lens system
CN103091817A (zh) * 2011-11-07 2013-05-08 大立光电股份有限公司 摄影系统
US20180052302A1 (en) * 2016-08-22 2018-02-22 Kinko-Optical Co., Ltd. Five-piece wide-angle lens module
CN106680974A (zh) * 2017-02-17 2017-05-17 浙江舜宇光学有限公司 摄像镜头
CN110007442A (zh) * 2019-05-08 2019-07-12 瑞声光电科技（苏州）有限公司 摄像光学镜头
CN110412736A (zh) * 2019-06-30 2019-11-05 瑞声科技(新加坡)有限公司 摄像光学镜头
CN110501806A (zh) * 2019-08-16 2019-11-26 瑞声通讯科技(常州)有限公司 摄像光学镜头
CN110515182A (zh) * 2019-08-19 2019-11-29 瑞声通讯科技(常州)有限公司 摄像光学镜头

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