WO2016182408A2 - 촬영 렌즈계 - Google Patents

촬영 렌즈계 Download PDF

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Publication number
WO2016182408A2
WO2016182408A2 PCT/KR2016/005151 KR2016005151W WO2016182408A2 WO 2016182408 A2 WO2016182408 A2 WO 2016182408A2 KR 2016005151 W KR2016005151 W KR 2016005151W WO 2016182408 A2 WO2016182408 A2 WO 2016182408A2
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WO
WIPO (PCT)
Prior art keywords
lens
refractive power
object side
lens system
conditional expression
Prior art date
Application number
PCT/KR2016/005151
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English (en)
French (fr)
Korean (ko)
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WO2016182408A3 (ko
Inventor
김성우
김성하
이진형
오우치유키
코노카즈후미
야마다미쯔아키
스다야스히로
Original Assignee
오사카 가스 케미칼 가부시키가이샤
주식회사 두성케미스
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 오사카 가스 케미칼 가부시키가이샤, 주식회사 두성케미스 filed Critical 오사카 가스 케미칼 가부시키가이샤
Priority to CN201680041558.1A priority Critical patent/CN107850755B/zh
Publication of WO2016182408A2 publication Critical patent/WO2016182408A2/ko
Publication of WO2016182408A3 publication Critical patent/WO2016182408A3/ko

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • 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
    • G02B13/18—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 can be mounted on a smartphone or a mobile terminal to have a camera function or can be applied to a digital camera.
  • a lens system using four lenses uses an aspherical lens for miniaturization and high performance of an optical system.
  • precision processing is difficult in the case of aspherical lenses. This results in deterioration of productivity.
  • the prior art has a narrow angle of view of 61 ° and a dark F number of 2.7 to 2.8.
  • the present invention has been made to solve various problems including the above problems, and an object of the present invention is to provide a photographing lens system that is easy to process a lens and that can be miniaturized and high pixelized.
  • Another object of the present invention is to provide a compact photographing lens system having excellent wide-angle performance.
  • the photographing lens system of the present invention sequentially includes the aperture, the first lens, the second lens, the third lens, and the fourth lens from the object side.
  • the first lens has positive refractive power and the object side is convex.
  • the second lens has negative refractive power, the object side is in the paraxial plane shape, and the image side is in the aspherical shape.
  • the third lens has a meniscus shape in which the object side is concave with positive refractive power.
  • the fourth lens has negative refractive power, and the object side is convex.
  • Abbe numbers of the first, third and fourth lenses are 40 to 50.
  • conditional expression may be satisfied for the first lens.
  • TTL is the distance from the first surface of the first lens to the image surface
  • y is half of the diagonal length on the image surface.
  • the object-side surface of the fourth lens may have a positive refractive power and a convex inflection point away from the optical axis.
  • the third lens may satisfy the following conditional expression.
  • K3 is the refractive power of the third lens
  • Kt is the refractive power of the entire lens system.
  • the first lens may satisfy the following conditional expression.
  • K1 is the refractive power of the first lens
  • Kt is the refractive power of the entire lens system.
  • the second lens may satisfy the following conditional expression.
  • K2 is the refractive power of the second lens and Kt is the refractive power of the entire lens system.
  • the fourth lens may satisfy the following conditional expression.
  • K4 is the refractive power of the fourth lens
  • Kt is the refractive power of the entire lens system.
  • FIG. 1 is a block diagram of a photographing lens system according to an exemplary embodiment of the present invention.
  • FIG. 2 is a block diagram of a photographing lens system according to another exemplary embodiment of the present invention.
  • FIG. 3 is a configuration diagram of a photographing lens system according to another exemplary embodiment of the present invention.
  • FIG. 4 is aberration diagrams related to longitudinal spherical aberration, astigmatism, and distortion of the photographing lens system of FIG. 1.
  • FIG. 5 is aberration diagrams related to longitudinal spherical aberration, astigmatism, and distortion of the photographing lens system of FIG. 2.
  • FIG. 6 is aberration diagrams related to longitudinal spherical aberration, astigmatism, and distortion of the photographing lens system of FIG. 3.
  • 1, 2 and 3 show photographing lens systems 10, 20 and 30 according to the first, second and third embodiments of the present invention, respectively.
  • 1 and 2 R1, R2, R3,...
  • the radius of curvature of the object-side / image-side surface of the diaphragm, lens, or optical filter, respectively, is shown and D1, D2, D3,...
  • the photographing lens systems 10, 20, 30 according to the first, second, and third embodiments of the present invention are sequentially apertured from the object side to the image side.
  • An optical member such as a filter LF may be further included between the fourth lens L4 and the image surface Si.
  • the first lens L1 has a positive refractive power and the object side is convex.
  • the lens may be a biconvex lens.
  • the second lens L2 has negative refractive power.
  • the second lens L2 is a meniscus-type lens in which the object side is in the paraxial plane shape and the image side surface is convex in the object side.
  • lenses that determine performance in a lens system composed of four lenses are a first lens and a second lens.
  • the sensitivity of the second lens L2 is high, and therefore, centering of the second lens is important.
  • at least the paraxial region on the object side of the second lens L2 is planar. In other words, the curvature in at least the paraxial region of the object-side surface of the second lens L2 is infinite.
  • the tilt value according to the decenter of the lens which is the physical displacement from the optical axis to the mechanical axis, becomes zero.
  • the amount of change in astigmatism and image curvature due to the tilt can be greatly reduced, so that a compact photographing lens system having low manufacturing sensitivity can be obtained, and the assembly of the lens is simple and quick.
  • the object-side surface of the second lens may be a whole plane, as shown in FIG. 1, may be planar only in the paraxial region, and may have a non-planar form, for example, a concave or convex shape, as the peripheral region.
  • the third lens L3 is a lens of a meniscus shape having a positive refractive power and a concave object side.
  • the fourth lens L4 has negative refractive power.
  • the image side surface of the fourth lens L4 may have an inflection point.
  • the image-side surface of the fourth lens L4 may be concave in the optical axis, but may be in the form of a convex meniscus lens as the distance from the optical axis increases. Accordingly, it is possible to reduce the incident angle of chief ray incident on the image plane and to reduce spherical aberration and astigmatism, thereby increasing the resolution of the lens.
  • the object-side surface of the fourth lens L4 may have an inflection point. That is, the object-side surface of the fourth lens L4 may have a convex shape in the optical axis, and may change into a meniscus shape concave in a direction away from the optical axis.
  • the iris St is positioned between the object-side surface and the image-side surface of the first lens in the paraxial region, and is positioned closer to the object side than the object-side surface of the first lens in an area deviating from the optical axis (that is, a position away from the optical axis).
  • the lens can be miniaturized by reducing the outer diameter of the lens.
  • the first lens L1 is biconvex. Accordingly, the first lens can be easily processed.
  • the second lens L2 has a negative refractive index, the optical length may be shortened, and the effective height of the center ray toward the periphery may also be increased.
  • the Abbe number of the first, third and fourth lenses L1, L3 and L4 may be 40 to 50.
  • the Abbe number of the 1st, 3rd, and 4th lenses conventional is about 55 degrees.
  • the angle of view can be widened, and the object side of the second lens can be manufactured in the paraxial plane form. have.
  • the Abbe number is smaller than 40, the longitudinal color aberration and astigmatism increase, and when the Abbe number is larger than 50, the longitudinal color aberration decreases but the astigmatism increases.
  • the depth and depth of astigmatism correction are excellent, the MTF Balance between the center and the surroundings is good, and the lateral chromatic aberration is equivalent to the material having the Abbe number of about 55. .
  • the first lens L1 and the second lens It is preferable to satisfy
  • the first lens L1 may have an Abbe number of 40 to 50
  • the second lens L2 may have an Abbe number of 20 to 30.
  • the longitudinal chromatic aberration that increases with the increase in the focal length can be effectively corrected.
  • a color flare that causes contrast to be reduced by reducing the Abbe's number difference between the first lens L1 and the second lens L2 by 20 or more can be reduced.
  • the second lens L2 may have an Abbe number of 20 to 25, more preferably 21 to 23 Abbe number.
  • TTL is the distance from the object-side surface of the first lens to the image surface
  • y is the highest image height (ie, half the length of the sensor diagonal in the image surface) on the image surface (image surface), and thus 2y is the image surface. Indicates the diagonal length of the sensor.
  • the optical system length becomes long, and the optical system cannot be miniaturized.
  • it is less than 1.68 the refractive power of the lens becomes excessively large, and aberration correction through the second lens and the third lens is not easy, and as a result, a high performance photographing lens system is not achieved.
  • the third lens L3 may satisfy the following conditional expression.
  • K3 is the refractive power of the third lens L3
  • Kt is the refractive power of the entire lens system.
  • K1 is the refractive power of the first lens L1.
  • K2 is the refractive power of the second lens L2, and K4 is the refractive power of the fourth lens L4.
  • the above condition refers to the ratio of each lens to the total refractive power, there is a problem that the astigmatism increases when the value exceeds the upper limit, and there is a problem that the distortion aberration increases when the value is less than the lower limit.
  • the iris St is positioned on the object side rather than the object side surface of the first lens L1, not only the effect of reducing the overall length (full length) of the photographing lens system can be miniaturized by reducing the outer diameter of the lens. .
  • the first, third, and fourth lenses L1, L3, and L4 may be made of the same plastic material.
  • the second lens may also be made of a plastic material.
  • the definition of the aspherical surface in the embodiment of the present invention is as follows.
  • the aspherical shape of the lens according to the embodiment of the present invention is represented by the following equation 1 with the z-axis as the optical axis direction and the h-axis as the direction perpendicular to the optical axis direction.
  • Can be Where z is the distance from the vertical plane on the aspheric vertex to the coordinate point on the aspherical surface of height h from the central optical axis, k is the Conic constant and c is the lens curvature of the aspherical vertex A4, A6, A8, A10 , A12, A14 ... and the like represent aspherical surface coefficients.
  • Table 1 shows design data of the photographing lens system 10 shown in FIG. 1, and Table 2 shows aspherical data.
  • the radius of curvature is R1, R2,.
  • the thickness or distance is indicated by D1, D2,... Is displayed.
  • the reason why the distance D1 between the diaphragm and the object-side surface of the first lens is negative in Table 1 is -0.02 because the position of the aperture is in the paraxial region of the object-side surface of the first lens and the first lens. Since it is located between the image side surfaces, it indicates that the surface of the stop is more image side than the object side surface of the first lens.
  • Example 1 Face number Radius of curvature Thickness, distance Refractive index (nd) Variance (vd) One Infinity -0.02 2* 1.5822 0.4700 1.53700 44.58 3 * -4.9676 0.2550 4* Infinity 0.2750 1.65760 21.53 5 * 2.1811 0.1150 6 * -2.1122 0.5900 1.53700 44.58 7 * -0.5173 0.0300 8* 1.2616 0.3200 1.53700 44.58 9 * 0.4435 0.3943 10 Infinity 0.3000 1.52529 54.47 11 Infinity 0.2979 12 Infinity 0.0028
  • FIG. 4 shows the longitudinal spherical aberration, astigmatism and distortion of the lens system 10 of the compact imaging lens system shown in FIG. 1.
  • Longitudinal spherical aberration was shown for light with wavelengths of about 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and astigmatism and distortion were shown for light of 555 nm.
  • Table 3 shows design data of the photographing lens system 20 shown in FIG. 2, and Table 4 shows aspherical data.
  • the radiuses of curvature are R1, R2,...
  • the thickness or distance is indicated by D1, D2,... Is displayed.
  • the reason why the distance D1 between the aperture and the object-side surface of the first lens L1 has a negative value of -0.02 is that the position of the aperture is the object side of the first lens L1 in the paraxial region. Since it is located between the surface and the image side surface of the first lens, it indicates that the surface of the aperture is closer to the image side than the object side surface of the first lens L1.
  • Example 2 Face number Radius of curvature Thickness, distance Refractive index (nd) Variance (vd) One Infinity -0.02 2* 1.7780 0.4100 1.53700 44.58 3 * -4.7596 0.2400 4* Infinity 0.3000 1.64850 22.44 5 * 2.6279 0.1050 6 * -1.7475 0.6100 1.53700 44.58 7 * -0.5703 0.0300 8* 0.8443 0.3000 1.53700 44.58 9 * 0.4271 0.4411 10 Infinity 0.3000 1.52529 54.47 11 Infinity 0.2930 12 Infinity 0.0039
  • FIG. 5 shows longitudinal spherical aberration, astigmatism and distortion of the lens system of the compact imaging lens system 20 shown in FIG. 2.
  • Table 5 shows design data of the photographing lens system 30 shown in FIG. 3, and Table 6 shows aspherical data.
  • the radiuses of curvature are R1, R2,...
  • the thickness or distance is indicated by D1, D2,... Is displayed.
  • the reason why the distance D1 between the aperture and the object-side surface of the first lens L1 has a negative value of -0.02 is that the position of the aperture and the object-side surface of the first lens in the paraxial region Since it is located between the image-side surfaces of one lens, this indicates that the surface of the aperture is closer to the image side than the object-side surface of the first lens.
  • Example 3 Face number Radius of curvature Thickness, distance Refractive index (nd) Variance (vd) One Infinity -0.020 2* 1.6908 0.4742 1.53700 44.58 3 * -4.8543 0.2322 4* Infinity 0.2994 1.65760 21.53 5 * 2.2390 0.1709 6 * -1.8870 0.5027 1.53700 44.58 7 * -0.5495 0.1000 8* 0.9771 0.2685 1.53700 44.58 9 * 0.4386 0.4411 10 Infinity 0.3000 1.52529 54.47 11 Infinity 0.2900 12 Infinity 0.0039
  • FIG. 6 shows longitudinal spherical aberration, astigmatism and distortion of the lens system of the small imaging lens system 30 shown in FIG. 3.
  • Longitudinal spherical aberration was shown for light with wavelengths of about 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and astigmatism and distortion were shown for light of 555 nm.
  • Table 7 below shows the numerical values for each example according to the above conditional formula.
  • Example 2 Example 3 40 ⁇ Vd1 ⁇ 50 44.58 44.58 44.58 40 ⁇ Vd3 ⁇ 50 44.58 44.58 44.58 40 ⁇ Vd4 ⁇ 50 44.58 44.58 44.58 19 ⁇ v1-v2 ⁇ 29 23.04907 22.14277 23.04907 0.6 ⁇
  • the present invention can be used for a device that requires photographing such as a portable terminal such as a smartphone, a notebook, a digital camera, and the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
PCT/KR2016/005151 2015-05-14 2016-05-16 촬영 렌즈계 WO2016182408A2 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201680041558.1A CN107850755B (zh) 2015-05-14 2016-05-16 摄影透镜系统

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KR1020150067450A KR101778071B1 (ko) 2015-05-14 2015-05-14 촬영 렌즈계

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CN109459834B (zh) * 2017-09-06 2021-02-19 信泰光学(深圳)有限公司 成像镜头
TWI719251B (zh) * 2017-09-06 2021-02-21 大陸商信泰光學（深圳）有限公司 成像鏡頭（十九）
CN110412738B (zh) * 2019-06-30 2021-12-14 瑞声光学解决方案私人有限公司 摄像光学镜头

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TWI612323B (zh) 2018-01-21
TW201706664A (zh) 2017-02-16
CN107850755B (zh) 2021-06-18
CN107850755A (zh) 2018-03-27
KR20160134052A (ko) 2016-11-23
WO2016182408A3 (ko) 2017-01-12
KR101778071B1 (ko) 2017-09-13

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