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WO2021119888A1 - Lentille de caméra optique - Google Patents

Lentille de caméra optique Download PDF

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Publication number
WO2021119888A1
WO2021119888A1 PCT/CN2019/125494 CN2019125494W WO2021119888A1 WO 2021119888 A1 WO2021119888 A1 WO 2021119888A1 CN 2019125494 W CN2019125494 W CN 2019125494W WO 2021119888 A1 WO2021119888 A1 WO 2021119888A1
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Prior art keywords
lens
imaging optical
curvature
ttl
radius
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PCT/CN2019/125494
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English (en)
Chinese (zh)
Inventor
贾春辉
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AAC Optics Changzhou Co Ltd
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AAC Optics Changzhou Co Ltd
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Priority to PCT/CN2019/125494 priority Critical patent/WO2021119888A1/fr
Publication of WO2021119888A1 publication Critical patent/WO2021119888A1/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

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.
  • Camera optical lenses on traditional electronic products mostly adopt four-element, five-element, six-element or even seven-element lens structure.
  • the shape setting is not sufficient, resulting in the wide-angle and ultra-thinning of the imaging optical lens is still insufficient.
  • the purpose of the present invention is to provide an imaging optical lens, which aims to solve the problems of insufficient 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 overall focal length of the imaging optical lens is f
  • the focal length of the first lens is f1
  • the focal length of the fifth lens is f5
  • the radius of curvature of the object side of the fourth lens is R7
  • the first lens has a focal length of f1.
  • the radius of curvature of the image side surface of the four lens is R8, the on-axis thickness of the first lens is d1, the on-axis distance from the image side of the first lens to the object side of the second lens is d2, and satisfies the following Relational formula: 0.30 ⁇ f1/f ⁇ 0.60; 10.00 ⁇ d1/d2 ⁇ 30.00; -15.00 ⁇ (R7+R8)/(R7-R8) ⁇ -2.50; -10.00 ⁇ f5/f ⁇ -5.00.
  • the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, the on-axis thickness of the third lens is d5, and the following relationship is satisfied: 2.00 ⁇ d4/d5 ⁇ 5.00.
  • 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 total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -3.61 ⁇ (R1+R2)/(R1-R2) ⁇ -0.36; 0.08 ⁇ d1/TTL ⁇ 0.30.
  • the focal length of the second lens is f2
  • 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, and the on-axis thickness of the second lens is Is d3
  • the total optical length of the camera optical lens is TTL, and satisfies the following relationship: -5.50 ⁇ f2/f ⁇ -0.43; 0.40 ⁇ (R3+R4)/(R3-R4) ⁇ 10.73; 0.02 ⁇ d3/ TTL ⁇ 0.06.
  • the focal length of the third lens is f3, the radius of curvature of the object side of the third lens is R5, the radius of curvature of the image side of the third lens is R6, and the on-axis thickness of the third lens Is d5, the total optical length of the camera optical lens is TTL, and satisfies the following relationship: -1.29 ⁇ f3/f ⁇ -0.29; 0.06 ⁇ (R5+R6)/(R5-R6) ⁇ 2.23; 0.02 ⁇ d5/ TTL ⁇ 0.11.
  • the focal length of the fourth lens is f4
  • the on-axis thickness of the fourth lens is d7
  • the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: 0.47 ⁇ f4/f ⁇ 3.39; 0.02 ⁇ d7/TTL ⁇ 0.07.
  • 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 axial thickness of the fifth lens is d9
  • the optical The total length is TTL, and satisfies the following relationship: -24.13 ⁇ (R9+R10)/(R9-R10) ⁇ -6.23; 0.05 ⁇ d9/TTL ⁇ 0.19.
  • the effective focal length of the imaging optical lens is EFL
  • the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: EFL/TTL ⁇ 1.17.
  • the aperture F number of the imaging optical lens is Fno, and satisfies the following relational expression: Fno ⁇ 2.58.
  • the total optical length of the camera optical lens is TTL, and satisfies the following relationship: TTL ⁇ 7.02.
  • the camera optical lens provided by the present invention has good optical performance and meets the design requirements of large aperture, wide-angle and ultra-thinness.
  • 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 has positive refractive power; the second lens L2 has negative refractive power; the third lens L3 has negative refractive power; the fourth lens L4 has positive refractive power; the fifth lens L5 has negative refractive power .
  • the focal length of the entire imaging optical lens is f
  • the focal length of the first lens is f1
  • the focal length of the fifth lens is f5
  • 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 first lens is d1
  • the on-axis distance from the image side of the first lens to the object side of the second lens is d2, which satisfies the following relationship:
  • conditional formula (1) specifies the ratio of the focal length of the first lens to the total focal length of the system, which can effectively balance the spherical aberration and field curvature of the system.
  • 0.33 ⁇ f1/f ⁇ 0.59 is satisfied.
  • the conditional formula (2) specifies the ratio of the thickness of the first lens to the air gap between the first and second lenses, which helps to compress the total length of the optical system within the scope of the conditional formula and achieve an ultra-thinning effect. Preferably, 10.49 ⁇ d1/d2 ⁇ 27.67 is satisfied.
  • Conditional formula (3) specifies the shape of the fourth lens. Within the range specified by the conditional formula, the degree of deflection of light passing through the lens can be relaxed, and aberrations can be effectively reduced. Preferably, -14.74 ⁇ (R7+R8)/(R7-R8) ⁇ -2.69 is satisfied.
  • Conditional formula (4) specifies the ratio of the focal length of the fifth lens to the total focal length of the system, and the rational allocation of focal lengths makes the system have better imaging quality and lower sensitivity. Preferably, -9.85 ⁇ f5/f ⁇ -5.00 is satisfied.
  • the ratio of the air gap between the second and third lenses to the thickness of the third lens helps to compress the total length of the optical system within the scope of the conditional formula and achieves an ultra-thin effect.
  • 2.10 ⁇ d4/d5 ⁇ 5.00 is satisfied.
  • the axial thickness of the first lens L1 is d1
  • the total optical length of the imaging optical lens is TTL, which satisfies the following relational expression: 0.08 ⁇ d1/TTL ⁇ 0.30.
  • 0.13 ⁇ d1/TTL ⁇ 0.24 is satisfied.
  • the focal length of the second lens L2 as f2
  • the overall focal length of the imaging optical lens 10 as f, which satisfies the following relationship: -5.50 ⁇ f2/f ⁇ -0.43.
  • the positive power of the second lens L2 in a reasonable range, Conducive to correcting the aberration of the optical system.
  • it satisfies -3.43 ⁇ f2/f ⁇ -0.54.
  • the curvature radius of the object side surface of the second lens L2 is R3, and the curvature radius of the image side surface of the second lens L2 is R4, which satisfies the following relationship: 0.40 ⁇ (R3+R4)/(R3-R4) ⁇ 10.73, which specifies the second lens
  • 0.40 ⁇ (R3+R4)/(R3-R4) ⁇ 10.73 which specifies the second lens
  • 0.64 ⁇ (R3+R4)/(R3-R4) ⁇ 8.59 is satisfied.
  • the on-axis thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.02 ⁇ d3/TTL ⁇ 0.06. Within the range of the conditional formula, it is beneficial to realize ultra-thinness. Preferably, 0.03 ⁇ d3/TTL ⁇ 0.05 is satisfied.
  • the focal length of the third lens L3 as f3
  • the overall focal length of the imaging optical lens 10 as f, which satisfies the following relationship: -1.29 ⁇ f3/f ⁇ -0.29, through the reasonable distribution of optical power, the system has better imaging Quality and low sensitivity.
  • -0.81 ⁇ f3/f ⁇ -0.36 is satisfied.
  • the curvature radius of the object side surface of the third lens L3 is R5, and the curvature radius of the image side surface of the third lens L3 is R6, which satisfies the following relationship: 0.06 ⁇ (R5+R6)/(R5-R6) ⁇ 2.23.
  • the shape of the three lens within the range specified by the conditional formula, can ease the degree of deflection of light passing through the lens and effectively reduce aberrations.
  • 0.09 ⁇ (R5+R6)/(R5-R6) ⁇ 1.78 is satisfied.
  • the axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.02 ⁇ d5/TTL ⁇ 0.11. Within the range of the conditional formula, it is beneficial to realize ultra-thinness. Preferably, 0.03 ⁇ d5/TTL ⁇ 0.09 is satisfied.
  • the focal length of the fourth lens L4 is defined as f4, and the overall focal length of the imaging optical lens 10 is f, which satisfies the following relationship: 0.47 ⁇ f4/f ⁇ 3.39.
  • the reasonable distribution of optical power enables the system to have better imaging quality and Lower sensitivity.
  • 0.75 ⁇ f4/f ⁇ 2.72 is satisfied.
  • the axial thickness of the fourth lens L4 is d7, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.02 ⁇ d7/TTL ⁇ 0.07. Within the range of the conditional expression, it is beneficial to realize ultra-thinness. Preferably, 0.03 ⁇ d7/TTL ⁇ 0.06 is satisfied.
  • the radius of curvature of the object side surface of the fifth lens L5 as R9
  • the radius of curvature of the image side surface of the fifth lens L5 as R10
  • the shape of the fifth lens L5 is specified, which is favorable for lens processing within the range of conditions.
  • -15.08 ⁇ (R9+R10)/(R9-R10) ⁇ -7.79 is satisfied.
  • the on-axis thickness of the fifth lens L5 is d9, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.05 ⁇ d9/TTL ⁇ 0.19. Within the range of the conditional formula, it is beneficial to realize ultra-thinness. Preferably, 0.08 ⁇ d9/TTL ⁇ 0.15 is satisfied.
  • the effective focal length of the overall imaging optical lens 10 is EFL
  • the total optical length of the imaging optical lens 10 is TTL
  • the following conditional formula is satisfied: EFL/TTL ⁇ 1.17, thereby achieving ultra-thinness.
  • the total optical length TTL of the imaging optical lens 10 is less than or equal to 7.02 mm, which is beneficial to realize ultra-thinness.
  • the total optical length TTL is less than or equal to 6.70 mm.
  • the aperture Fno of the imaging optical lens 10 is less than or equal to 2.58. Large aperture, good imaging performance. Preferably, Fno is less than or equal to 2.53.
  • the surface of each lens can be set as an aspherical surface.
  • the aspherical surface can be easily made into a shape other than a spherical surface, and more control variables can be obtained to reduce aberrations, thereby reducing the use of lenses. Therefore, the total length of the imaging optical lens 10 can be effectively reduced.
  • both the object side surface and the image side surface of each lens are aspherical.
  • the imaging optical lens 10 can be reasonable The power, spacing, and shape of each lens are allocated, and various aberrations are corrected accordingly.
  • 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.
  • Table 1 lists the object side curvature radius and the image side curvature radius R of the first lens L1 to the fifth lens L5 constituting the imaging optical lens 10 in the first embodiment of the present invention, the on-axis thickness of each lens, and two adjacent lenses The distance d, the refractive index nd and the Abbe number ⁇ d. It should be noted that in this embodiment, the units of R and d are both millimeters (mm).
  • R The radius of curvature of the optical surface, and the radius of curvature of the center of the lens
  • R1 the radius of curvature of the object side surface of the first lens L1;
  • R2 the radius of curvature of the image side surface of the first lens L1;
  • 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;
  • d4 the on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;
  • d6 the on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;
  • 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
  • nd1 the refractive index of the d-line of the first lens L1;
  • nd2 the refractive index of the d-line of the second lens L2;
  • nd3 the refractive index of the d-line of the third lens L3;
  • nd4 the refractive index of the d-line of the fourth lens L4;
  • nd5 the refractive index of the d-line of the fifth lens L5;
  • ndg the refractive index of the d-line of the optical filter GF
  • vg Abbe number of optical filter GF.
  • Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspherical coefficients.
  • the aspheric surface of each lens surface uses the aspheric surface shown in the above formula (1).
  • the present invention is not limited to the aspheric polynomial form represented by the formula (1).
  • Table 3 and Table 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 of this embodiment.
  • P1R1 and P1R2 represent the object side and image side of the first lens L1 respectively
  • P2R1 and P2R2 represent the object side and image side of the second lens L2 respectively
  • P3R1 and P3R2 represent the object side and image side of the third lens L3 respectively
  • P4R1 and P4R2 represent the object side and image side of the fourth lens L4, respectively
  • P5R1 and P5R2 represent the object side and the image side of the fifth lens L5, respectively.
  • the corresponding data in the “reflection point position” column is the vertical distance from the reflex point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • the data corresponding to the “stationary point position” column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10.
  • FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 550 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.
  • the imaging optical lens 10 has an entrance pupil diameter of 3.001mm, a full field of view image height of 2.04mm, a diagonal viewing angle of 30.00°, a large aperture, wide angle, ultra-thin, and Has excellent optical characteristics.
  • 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 5 and Table 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.
  • 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, 550 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 550 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 imaging optical lens 20 has an entrance pupil diameter of 3.001mm, a full-field image height of 2.04mm, a diagonal viewing angle of 30.00°, a large aperture, wide angle, ultra-thin, and Has excellent optical characteristics.
  • FIG. 9 is a schematic diagram of the structure of the imaging optical lens 30 in the third embodiment.
  • the third 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 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.
  • Table 11 and Table 12 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 30.
  • FIG. 10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 650 nm, 610 nm, 550 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 550 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.
  • the imaging optical lens 30 has an entrance pupil diameter of 3.000mm, a full field of view image height of 2.04mm, a diagonal field of view angle of 30.00°, a large aperture, wide angle, ultra-thin, and Has excellent optical characteristics.
  • 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-mentioned conditional expressions, as well as the values of other related parameters.
  • Example 1 Example 2
  • Example 3 f1/f 0.37 0.57 0.57 d1/d2 25.34 13.99 10.97 (R7+R8)/(R7-R8) -2.89 -5.34 -14.47 f5/f -6.02 -5.01 -9.69 f 7.501 7.501 7.501 f1 2.743 4.276 4.276 f2 -4.868 -17.016 -20.611 f3 -3.226 -4.679 -4.843 f4 7.043 11.027 16.977 f5 -45.170 -37.568 -72.695 f12 4.494 5.134 4.891 Fno 2.50 2.50 2.50 2.50
  • Fno is the aperture F number of the imaging optical lens.

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Abstract

L'invention concerne une lentille de caméra optique (10), comprenant séquentiellement, d'un côté objet à un côté image, une première lentille (L1) ayant une réfringence positive, une deuxième lentille (L2) ayant une réfringence négative, une troisième lentille (L3) ayant une réfringence négative, une quatrième lentille (L4) ayant une réfringence positive et une cinquième lentille (L5) ayant une réfringence négative, qui satisfont les expressions de relation suivantes : 0,30 ≤ f1/f ≤ 0,60 ; 10,00 ≤ d1/d2 ≤ 30,00 ; -15,00 ≤ (R7 + R8)/(R7 - R8) ≤ -2,50 ; et -10,00 ≤ f5/f ≤ -5,00. La lentille de caméra optique (10) satisfait aux exigences de conception d'une grande ouverture, d'un grand-angle et d'une ultra-minceur tout en ayant également de bonnes performances optiques.
PCT/CN2019/125494 2019-12-16 2019-12-16 Lentille de caméra optique Ceased WO2021119888A1 (fr)

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Application Number Priority Date Filing Date Title
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130100545A1 (en) * 2011-10-21 2013-04-25 Samsung Electro-Mechanics Co., Ltd. Imaging lens
US8873165B1 (en) * 2013-12-19 2014-10-28 Glory Science Co., Ltd. Optical lens system
CN110221410A (zh) * 2019-06-30 2019-09-10 瑞声科技(新加坡)有限公司 摄像光学镜头
CN110361852A (zh) * 2019-07-24 2019-10-22 Oppo广东移动通信有限公司 镜头、摄像模组及电子设备
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130100545A1 (en) * 2011-10-21 2013-04-25 Samsung Electro-Mechanics Co., Ltd. Imaging lens
US8873165B1 (en) * 2013-12-19 2014-10-28 Glory Science Co., Ltd. Optical lens system
CN110221410A (zh) * 2019-06-30 2019-09-10 瑞声科技(新加坡)有限公司 摄像光学镜头
CN110361852A (zh) * 2019-07-24 2019-10-22 Oppo广东移动通信有限公司 镜头、摄像模组及电子设备
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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