WO2021127852A1 - Lentille optique photographique - Google Patents

Lentille optique photographique Download PDF

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Publication number
WO2021127852A1
WO2021127852A1 PCT/CN2019/127470 CN2019127470W WO2021127852A1 WO 2021127852 A1 WO2021127852 A1 WO 2021127852A1 CN 2019127470 W CN2019127470 W CN 2019127470W WO 2021127852 A1 WO2021127852 A1 WO 2021127852A1
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Prior art keywords
lens
imaging optical
image side
object side
ttl
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PCT/CN2019/127470
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English (en)
Chinese (zh)
Inventor
马健
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诚瑞光学(常州)股份有限公司
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Priority to PCT/CN2019/127470 priority Critical patent/WO2021127852A1/fr
Publication of WO2021127852A1 publication Critical patent/WO2021127852A1/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
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only

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 photosensitive devices of general photographic lenses are nothing more than photosensitive coupled devices (CCD) or complementary metal oxide semiconductor devices (Complementary Metal).
  • CCD photosensitive coupled devices
  • CMOS Sensor complementary metal oxide semiconductor devices
  • the miniaturized camera lens with image quality has become the mainstream in the current market.
  • 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 pitch and lens shape settings are still unreasonable, resulting in the lens structure having good optical performance, but cannot meet the requirements of large aperture, Design requirements for ultra-thin and wide-angle.
  • the object of the present invention is to provide an imaging optical lens, which has good optical performance and meets the design requirements of large aperture, ultra-thin, and wide-angle.
  • the embodiments of the present invention provide the imaging optical lens, which sequentially includes from the object side to the image side: a first lens with negative refractive power, a second lens with positive refractive power, and The third lens with negative refractive power, the fourth lens with positive refractive power and the fifth lens;
  • the focal length of the imaging optical lens is f
  • the focal length of the first lens is f1
  • the focal length of the third lens is f3
  • the radius of curvature of the object side surface of the fifth lens is R9
  • the fifth lens image side The radius of curvature of is R10
  • the on-axis thickness of the fourth lens L4 is d7
  • the on-axis distance from the image side surface of the fourth lens to the object side surface of the fifth lens is d8, which satisfies the following relationship:
  • the radius of curvature of the object side surface of the second lens is R3
  • the radius of curvature of the image side surface of the second lens is R4, and the following relationship is satisfied:
  • the object side of the first lens is convex on the paraxial axis, and the image side is concave on the paraxial;
  • the radius of curvature of the object side of the first lens is R1
  • the radius of curvature of the image side of the first lens is R2
  • the on-axis thickness of the first lens is d1
  • the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
  • the object side surface of the second lens is convex on the paraxial axis, and the image side surface is convex on the par axis;
  • the focal length of the second lens is f2
  • the on-axis thickness of the second lens is d3.
  • the total optical length of the camera optical lens is TTL and satisfies the following relationship:
  • the object side surface of the third lens is convex on the par axis, and the image side surface is concave on the par axis;
  • 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,
  • the axial thickness of the third lens is d5
  • the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:
  • the image side surface of the fourth lens is convex on the paraxial;
  • the focal length of the fourth lens is f4
  • the curvature radius of the object side surface of the fourth lens is R7
  • the curvature radius of the image side surface of the fourth lens Is R8,
  • 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:
  • the object side surface of the fifth lens is convex on the paraxial axis, and the image side surface is concave on the paraxial axis;
  • the focal length of the fifth lens is f5
  • the on-axis thickness of the fifth lens is d9.
  • the total optical length of the camera optical lens is TTL and satisfies the following relationship:
  • the total optical length of the imaging optical lens is TTL
  • the image height of the imaging optical lens is IH
  • the field of view of the imaging optical lens is FOV, and satisfies the following relationship:
  • the aperture F number of the imaging lens is Fno, and the following relational expression is satisfied:
  • the imaging optical lens according to the present invention has good optical performance, and has the characteristics of large aperture, wide-angle, and ultra-thinness, and is especially suitable for mobile phones composed of high-pixel CCD, CMOS and other imaging elements.
  • Camera lens assembly and WEB camera lens are examples of the imaging optical lens according to the present invention.
  • FIG. 1 is a schematic diagram of the structure of an 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 the 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.
  • FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention.
  • the imaging optical lens 10 includes five lenses. Specifically, the imaging optical lens 10 includes in order from the object side to the image side: a first lens L1 with a negative refractive power, an aperture S1, a second lens L2 with a positive refractive power, and a third lens with a negative refractive power.
  • the lens L3, the fourth lens L4 and the fifth lens L5 having positive refractive power.
  • An optical element such as an optical filter GF may be provided between the fifth lens L5 and the image plane Si.
  • the focal length of the imaging optical lens is f
  • the focal length of the first lens L1 is f1
  • the following relationship is satisfied: -5.00 ⁇ f1/f ⁇ -3.00
  • the focal length of the first lens L1 is defined as The ratio of the total focal length of the system can effectively balance the spherical aberration and field curvature of the system.
  • the focal length of the third lens L3 is f3, which satisfies the following relationship: -3.00 ⁇ f3/f ⁇ -1.50, which specifies the ratio of the focal length of the third lens L3 to the total focal length of the system.
  • the reasonable allocation of the focal length makes the system more Good imaging quality and low sensitivity.
  • the radius of curvature of the object side surface of the fifth lens L5 is R9, and the radius of curvature of the image side surface of the fifth lens L5 is R10, which satisfies the following relationship: 3.00 ⁇ (R9+R10)/(R9-R10) ⁇ 10.00; stipulated In addition to the shape of the fifth lens L5, within this range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, 3.05 ⁇ (R9+R10)/(R9-R10) ⁇ 9.51.
  • the on-axis thickness of the fourth lens L4 is d7, and the on-axis distance between the mirror image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is d8, which satisfies the following relationship: 3.50 ⁇ d7/d8 ⁇ 6.00;
  • the ratio of the thickness of the fourth lens L4 to the air space between the fourth lens L4 and the fifth lens L5 helps to compress the total optical length within the scope of the conditional formula, and realizes an ultra-thinning effect.
  • the curvature radius of the object side surface of the second lens L2 as R3, and the curvature radius of the image side surface of the second lens L2 as R4, and satisfy the following relationship: 0.10 ⁇ (R3+R4)/(R3-R4) ⁇ 1.00 ,
  • the shape of the second lens L2 is specified, and within the specified range of the conditional expression, the degree of deflection of the light passing through the lens can be relaxed, and aberrations can be effectively reduced.
  • the object side surface of the first lens L1 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has a negative refractive power.
  • 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 relationship: 0.03 ⁇ d1/TTL ⁇ 0.10, which is beneficial to realize ultra-thinness.
  • 0.05 ⁇ d1/TTL ⁇ 0.08 is satisfied.
  • the object side surface of the second lens L2 is convex at the paraxial position, and the image side surface is convex at the paraxial position, and has positive refractive power.
  • the focal length of the second lens L2 is defined as f2, which satisfies the following relationship: 0.57 ⁇ f2/f ⁇ 1.87.
  • f2 The focal length of the second lens L2 is defined as f2, which satisfies the following relationship: 0.57 ⁇ f2/f ⁇ 1.87.
  • the on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.05 ⁇ d3/TTL ⁇ 0.18, which is beneficial to realize ultra-thinness.
  • 0.08 ⁇ d3/TTL ⁇ 0.14 is satisfied.
  • the object side surface of the third lens L3 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has negative refractive power.
  • the curvature radius of the object side surface of the third lens L3 as R5
  • the curvature radius of the image side surface of the third lens L3 as R6, satisfying the following relationship: 0.72 ⁇ (R5+R6)/(R5-R6) ⁇ 3.07
  • the shape of the third lens L3 is specified, and within the specified range of the conditional expression, it is beneficial to the molding of the third lens L3, and avoids molding defects and stress generation due to excessive surface curvature of the third lens L3.
  • it satisfies 1.15 ⁇ (R5+R6)/(R5-R6) ⁇ 2.46.
  • the on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.03 ⁇ d5/TTL ⁇ 0.09, which is beneficial to realize ultra-thinness.
  • 0.05 ⁇ d5/TTL ⁇ 0.07 is satisfied.
  • the image side surface of the fourth lens L4 is convex at the paraxial position and has positive refractive power.
  • the focal length of the fourth lens L4 is defined as f4, and the following relational expression is satisfied: 0.39 ⁇ f4/f ⁇ 3.77; the ratio of the focal length of the fourth lens L4 to the focal length of the imaging optical lens is specified, in the conditional range It helps to improve the image quality. Preferably, 0.62 ⁇ f4/f ⁇ 3.02 is satisfied.
  • the curvature radius of the object side surface of the fourth lens L4 is R7, and the curvature radius of the image side surface of the fourth lens L4 is R8, and the following relationship is satisfied: 0.39 ⁇ (R7+R8)/(R7-R8) ⁇ 4.34 .
  • the shape of the fourth lens L4 is specified. When it is within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, it satisfies 0.62 ⁇ (R7+R8)/(R7-R8) ⁇ 3.47.
  • the axial thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.11 ⁇ d7/TTL ⁇ 0.36, which is beneficial to realize ultra-thinness.
  • 0.17 ⁇ d7/TTL ⁇ 0.29 is satisfied.
  • the object side surface of the fifth lens L5 is convex at the paraxial position, and the image side surface is concave at the paraxial position.
  • the focal length of the fifth lens L5 is defined as f5, which satisfies the following relationship: -8.09 ⁇ f5/f ⁇ 11.76.
  • the limitation of the fifth lens L5 can effectively make the light angle of the camera lens smooth and reduce the tolerance sensitivity. Preferably, it satisfies -5.05 ⁇ f5/f ⁇ 9.41.
  • the on-axis thickness of the fifth lens L5 is d9, which satisfies the following relationship: 0.06 ⁇ d9/TTL ⁇ 0.21, which is beneficial to realize ultra-thinness.
  • 0.09 ⁇ d9/TTL ⁇ 0.17 is satisfied.
  • the image height of the imaging optical lens 10 is IH, which satisfies the following relationship: TTL/IH ⁇ 1.76, which is beneficial to realize ultra-thinness.
  • the overall optical length TTL of the overall imaging optical lens 10 can be shortened as much as possible, and the characteristics of miniaturization can be maintained.
  • the field of view of the imaging optical lens 10 is FOV, which satisfies the following relationship: FOV ⁇ 105.00°, which is beneficial to realize a wide angle.
  • the aperture F number of the imaging optical lens 10 is Fno, which satisfies the following relationship: Fno ⁇ 2.37, which is beneficial to realize a large aperture and good imaging performance.
  • Fno ⁇ 2.32 is satisfied.
  • the imaging optical lens 10 can have good optical performance, and at the same time, it can meet the requirements of large aperture, wide-angle, and ultra-thinness. Design requirements; According to the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for mobile phone camera lens components and WEB camera lenses composed of high-pixel CCD, CMOS and other imaging elements.
  • 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 imaging surface), the unit is mm;
  • the object side and/or the image side of the lens can also be provided with inflection points and/or stagnation points to meet high-quality imaging requirements.
  • inflection points and/or stagnation points for specific implementations, refer to the following.
  • Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.
  • 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 surface 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 of the first embodiment of the present invention.
  • k is the conic coefficient
  • A4, A6, A8, A10, A12, A14, A16, A18, 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 the first embodiment of the present invention.
  • 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. 2 and 3 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 435 nm, 486 nm, 546 nm, 587 nm, and 656 nm pass through the imaging optical lens 10 of the first embodiment.
  • Fig. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 546 nm after passing through the imaging optical lens 10 of the first embodiment.
  • the field curvature S in Fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. song.
  • Table 13 shows the values corresponding to the various values in the first, second, and third embodiments and the parameters specified in the conditional expressions.
  • the first embodiment satisfies various conditional expressions.
  • the entrance pupil diameter of the imaging optical lens is 0.840mm
  • the full-field image height is 2.30mm
  • the diagonal viewing angle is 105.20°, which makes the imaging lens wide-angle and ultra-thin.
  • the chromatic aberration on and off-axis is fully corrected, and it has excellent optical characteristics.
  • the second embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment.
  • the structure of the imaging optical lens 20 of the second embodiment is shown in FIG. 5, and 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 according to the second embodiment of the present invention.
  • FIG. 6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm pass through the imaging optical lens 20 of the second embodiment.
  • FIG. 8 shows a schematic diagram of field curvature and distortion after light having a wavelength of 54 nm passes through the imaging optical lens 20 of the second embodiment.
  • the second embodiment satisfies various conditional expressions.
  • the entrance pupil diameter of the imaging optical lens is 0.847mm
  • the full-field image height is 2.30mm
  • the diagonal field angle is 105.00°, which makes the imaging lens wide-angle and ultra-thin.
  • the chromatic aberration on and off-axis is fully corrected, and it has excellent optical characteristics.
  • the third embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment. Please refer to FIG. 9 for the structure of the imaging optical lens 30 of the third embodiment. 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 of the third embodiment of the present invention.
  • FIG. 10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 435 nm pass through the imaging optical lens 30 of the third embodiment.
  • FIG. 12 shows a schematic diagram of field curvature and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 30 of the third embodiment.
  • the entrance pupil diameter of the imaging optical lens is 0.839mm
  • the full-field image height is 2.30mm
  • the diagonal viewing angle is 105.40°, which makes the imaging lens wide-angle and ultra-thin.
  • the chromatic aberration on and off-axis is fully corrected, and it has excellent optical characteristics.
  • Example one Example two Example three f1/f -3.42 -4.95 -3.02 f3/f -2.15 -2.90 -1.54 (R9+R10)/(R9-R10) 4.99 9.02 3.09 d7/d8 4.62 5.96 3.51 f 1.932 1.948 1.930 f1 -6.601 -9.642 -5.828 f2 2.405 2.204 2.303 f3 -4.162 -5.649 -2.969 f4 2.165 4.902 1.502 f5 -7.812 15.271 -2.957 f12 3.509 2.730 3.477 Fno 2.30 2.30 2.30 2.30 2.30
  • f12 is the combined focal length of the first lens L1 and the second lens L2.

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Abstract

Lentille optique photographique (10) ultramince à grand angle et à grande ouverture comprenant séquentiellement, d'un côté objet à un côté image : une première lentille (L1) ayant une réfringence négative, une deuxième lentille (L2) ayant une réfringence positive, une troisième lentille (L3) ayant une réfringence négative, une quatrième lentille (L4) ayant une réfringence positive et une cinquième lentille (L5). La lentille optique photographique satisfait les expressions relationnelles suivantes : -5,00 ≤ f1/f ≤ -3,00 ; -3,00 ≤ f3/f ≤ -1,50 ; 3,00 ≤ (R9+R10)/(R9-R10) ≤ 10,00 ; et 3,50 ≤ d7/d8 ≤ 6,00, f, f1 et f3 étant respectivement les distances focales de la lentille optique photographique (10), de la première lentille (L1) et de la troisième lentille (L3), R9 et R10 étant respectivement les rayons de courbure de la surface côté objet et de la surface côté image de la cinquième lentille, d7 étant l'épaisseur axiale de la quatrième lentille (L4) et d8 étant la distance axiale de la surface côté image de la quatrième lentille (L4) à la surface côté objet de la cinquième lentille (L5).
PCT/CN2019/127470 2019-12-23 2019-12-23 Lentille optique photographique WO2021127852A1 (fr)

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CN114779432A (zh) * 2022-03-10 2022-07-22 东莞晶彩光学有限公司 一种广角度光学镜头
CN114815171A (zh) * 2022-06-28 2022-07-29 江西联益光学有限公司 光学镜头

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US20140085735A1 (en) * 2012-09-26 2014-03-27 Asia Optical International Ltd. Slim Lens Assembly
US20170261726A1 (en) * 2014-11-28 2017-09-14 Nikon Corporation Imaging lens and image capturing device
CN105842827A (zh) * 2015-01-16 2016-08-10 大立光电股份有限公司 光学摄像***、取像装置及电子装置
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CN114779432A (zh) * 2022-03-10 2022-07-22 东莞晶彩光学有限公司 一种广角度光学镜头
CN114779432B (zh) * 2022-03-10 2023-09-08 东莞晶彩光学有限公司 一种广角度光学镜头
CN114815171A (zh) * 2022-06-28 2022-07-29 江西联益光学有限公司 光学镜头
CN114815171B (zh) * 2022-06-28 2022-11-01 江西联益光学有限公司 光学镜头

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