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WO2016182409A1 - Système d'objectif de prise de vues - Google Patents

Système d'objectif de prise de vues Download PDF

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Publication number
WO2016182409A1
WO2016182409A1 PCT/KR2016/005153 KR2016005153W WO2016182409A1 WO 2016182409 A1 WO2016182409 A1 WO 2016182409A1 KR 2016005153 W KR2016005153 W KR 2016005153W WO 2016182409 A1 WO2016182409 A1 WO 2016182409A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
focal length
effective focal
lens system
refractive power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2016/005153
Other languages
English (en)
Korean (ko)
Inventor
김성우
김성하
이진형
오우치유키
코노카즈후미
야마다미쯔아키
스다야스히로
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osaka Gas Chemicals Co Ltd
Doosung Chemis Corp
Original Assignee
Osaka Gas Chemicals Co Ltd
Doosung Chemis Corp
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 Osaka Gas Chemicals Co Ltd, Doosung Chemis Corp filed Critical Osaka Gas Chemicals Co Ltd
Priority to CN201680041670.5A priority Critical patent/CN107850756B/zh
Publication of WO2016182409A1 publication Critical patent/WO2016182409A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

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, and the image side is concave.
  • the third lens has a positive refractive power.
  • the fourth lens has negative refractive power, the object side is convex, and the image side is concave. In this case, the object side of the third lens has a concave spherical surface.
  • the Abbe number of the first lens is 40 to 50.
  • the Abbe number of the third lens and the fourth lens may be 50 to 60.
  • the first lens may satisfy the following conditional expression.
  • f is an effective focal length of the entire lens system
  • f1 is an effective focal length of the first lens
  • the second lens may satisfy the following conditional expression.
  • f is an effective focal length of the entire lens system
  • f2 is an effective focal length of the second lens
  • the third lens may satisfy the following conditional expression.
  • f is an effective focal length of the entire lens system
  • f1 is an effective focal length of the first lens
  • the fourth lens may satisfy the following conditional expression.
  • f is an effective focal length of the entire lens system
  • f4 is an effective focal length of the fourth lens
  • 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 a photographing lens system according to the first, second and third embodiments of the present invention.
  • 1, 2 and 3, 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,...
  • D1, D2, D3,... The distance between the iris, lens or optical filter or the center thickness of the iris, lens or optical filter.
  • the photographing lens systems 10, 20, and 30 sequentially move from the object side to the image side, such as the aperture (St) and the first lens ( L1), a second lens L2, a third lens L3, and a fourth lens L4.
  • 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 and the image is concave.
  • the third lens L3 has a positive refractive power and the object side has a concave spherical surface. Therefore, spherical aberration, astigmatism and distortion can be reduced.
  • 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 image-side surface of the third lens L3 a spherical surface, it is possible to reduce the precision workability.
  • the fourth lens L4 has negative refractive power.
  • the fourth lens L4 may have a convex shape on the object side and a concave shape on the image side.
  • the image side surface of the fourth lens L4 may have an inflection point. If the image side has 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 a convex shape in the optical axis, and may change into a meniscus shape concave in a direction away from the optical axis.
  • the stop St may be at the same position as the object-side surface of the first lens. In this case, not only the overall length (full length) of the compact photographing lens system can be reduced, but also the miniaturization can be achieved by reducing the outer diameter of the lens.
  • the Abbe number of the first lens L1 may be 40 to 50. In the conventional four-lens system, the Abbe number of the first lens L1 is about 55. In the present invention, by adjusting the Abbe number of the first lens to 40 to 50, the angle of view can be wider and the object side of the second lens L2 can be manufactured in the form of a sphere. In this case, more preferably, the Abbe number of the first lens L1 may be 44 to 46.
  • the Abbe number of the first lens L1 is smaller than 40, the longitudinal chromatic aberration and astigmatism increase, and when larger than 50, the longitudinal chromatic aberration decreases but the astigmatism increases.
  • the Abbe number of the third lens L3 and the fourth lens L4 may be 50 to 60.
  • the Abbe number of the first, second, third, and fourth lenses L1, L2, L3, and L4 to 40 to 50, 20 to 30, 50 to 60, and 50 to 60, respectively a high field of view can be obtained.
  • the F number can also be reduced.
  • 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. Accordingly, it is possible to effectively correct the longitudinal chromatic aberration that increases with the increase in the focal length.
  • the color flare can be reduced by making the difference between the Abbe number of the first lens L1 and the second lens L2 by 20 or more.
  • the color flare causes contrast to fall.
  • the second lens L2 may have an Abbe number of 20 to 25, more preferably 21 to 23 Abbe number.
  • the aberration can be reduced even when the object side of the third lens L3 is spherical.
  • the first lens L1 may satisfy the following conditional expression.
  • f is an effective focal length of the entire lens system
  • f1 is an effective focal length of the first lens
  • f / f1 When f / f1 is smaller than 1.02, the positive refractive power of the first lens L1 becomes too small, making it difficult to implement a compact imaging optical system that is compact and has a small overall length. In addition, when f / f1 is larger than 1.06, various aberrations such as coma and astigmatism increase.
  • f2 is the effective focal length of the second lens L2.
  • f3 is an effective focal length of the third lens L3, and
  • f4 is an effective focal length of the fourth lens L4.
  • the above conditions of f1, f2, f3 and f4 have an angle of view wider than 75 ° while the object side of the third lens L3 has a concave spherical shape, and the F number is 2 to 2.4. This is a condition that can have a bright and compact configuration.
  • 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 described in Table 1 to have a value of zero is that the position of the aperture is the same position as the object-side surface of the first lens.
  • Example 1 Face number Radius of curvature Thickness, distance Refractive index (nd) Variance (vd) One 8 0.00 2* 1.277 0.34 1.5350 44.58 3 * -2.063 0.10 4* 8 0.15 1.6418 22.44 5 * 1.852 0.20 6 -1.003 0.47 1.5311 55.73 7 * -0.346 0.10 8* 4.626 0.20 1.5311 55.73 9 * 0.439 0.36 10 8 0.20 1.5230 54.48 11 8 0.22 12 8 0.00
  • FIG. 4 shows the longitudinal spherical aberration, astigmatism and distortion of the lens system of the small imaging lens system 10 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.
  • FIG. 5 shows longitudinal spherical aberration, astigmatism and distortion of the lens system of the 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.
  • Example 3 Face number Radius of curvature Thickness, distance Refractive index (nd) Variance (vd) One 8 -0.05 2* 1.277 0.37 1.5370 44.58 3 * -2.105 0.11 4* 33.256 0.12 1.6418 22.44 5 * 1.888 0.20 6 -0.997 0.48 1.5311 55.73 7 * -0.344 0.10 8* 4.982 0.20 1.5311 55.73 9 * 0.435 0.36 10 8 0.20 1.5230 54.48 11 8 0.20 12 8 0.03
  • 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 shows the numerical values for each example according to the conditional formula.
  • Example 2 Example 3 1.02 ⁇ f / f1 ⁇ 1.06 1.05 1.05 1.03 0.50 ⁇
  • 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)

Abstract

L'invention se rapporte à un système d'objectif de prise de vues qui est compact du fait de la petite taille des pixels, mais qui présente une résolution élevée et qui permet ainsi la mise en œuvre d'un appareil de prise de vues à haute résolution. L'objectif de prise de vues selon la présente invention comprend, dans l'ordre à partir d'un côté objet : un diaphragme ; une première lentille qui possède une réfringence positive et qui a une forme convexe sur le côté objet ; une deuxième lentille qui possède une réfringence négative et qui a une forme concave sur le côté supérieur ; une troisième lentille qui a une réfringence positive ; et une quatrième lentille qui a une réfringence négative, une forme convexe sur le côté objet, et une forme concave sur le côté supérieur. Dans l'invention, le côté objet de la troisième lentille possède une surface sphérique concave. Le nombre d'Abbe de la première lentille est compris entre 40 et 50. Dans ladite invention, l'angle de vue peut être d'au moins 78°, et l'ouverture numérique peut être de 2,4 au maximum.
PCT/KR2016/005153 2015-05-14 2016-05-16 Système d'objectif de prise de vues Ceased WO2016182409A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201680041670.5A CN107850756B (zh) 2015-05-14 2016-05-16 摄影透镜系统

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150067451A KR101778070B1 (ko) 2015-05-14 2015-05-14 촬영 렌즈계
KR10-2015-0067451 2015-05-14

Publications (1)

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WO2016182409A1 true WO2016182409A1 (fr) 2016-11-17

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KR (1) KR101778070B1 (fr)
CN (1) CN107850756B (fr)
TW (1) TWI601977B (fr)
WO (1) WO2016182409A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6932473B1 (ja) * 2020-09-19 2021-09-08 レイテック オプティカル （ジョウシュウ） カンパニーリミテッド 撮像光学レンズ

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108983409B (zh) * 2018-09-11 2020-09-25 沈阳师范大学 一种微距目镜透镜及搭载该微距目镜透镜的摄像装置

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JP2002365530A (ja) * 2001-06-05 2002-12-18 Casio Comput Co Ltd 撮影レンズ
KR20040060621A (ko) * 2002-12-30 2004-07-06 삼성테크윈 주식회사 촬영 렌즈
JP2006133270A (ja) * 2004-11-02 2006-05-25 Matsushita Electric Ind Co Ltd 撮影レンズ
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JP3424030B2 (ja) * 2001-01-31 2003-07-07 カシオ計算機株式会社 撮影レンズ
US7277238B2 (en) 2005-10-10 2007-10-02 Largan Precision Co., Ltd. Imaging lens array
JP4879600B2 (ja) 2006-02-15 2012-02-22 富士フイルム株式会社 撮像レンズ
CN100504488C (zh) * 2006-08-11 2009-06-24 宁波广博数码科技有限公司 数码相机镜头
TW200923407A (en) * 2007-11-30 2009-06-01 Newmax Technology Co Ltd Imaging lens set

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002365530A (ja) * 2001-06-05 2002-12-18 Casio Comput Co Ltd 撮影レンズ
KR20040060621A (ko) * 2002-12-30 2004-07-06 삼성테크윈 주식회사 촬영 렌즈
JP2006133270A (ja) * 2004-11-02 2006-05-25 Matsushita Electric Ind Co Ltd 撮影レンズ
JP2007140006A (ja) * 2005-11-17 2007-06-07 Matsushita Electric Ind Co Ltd 撮影レンズおよび２焦点撮影レンズ
KR20090091915A (ko) * 2008-02-26 2009-08-31 삼성전기주식회사 촬상 광학계

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6932473B1 (ja) * 2020-09-19 2021-09-08 レイテック オプティカル （ジョウシュウ） カンパニーリミテッド 撮像光学レンズ

Also Published As

Publication number Publication date
CN107850756B (zh) 2020-09-08
KR101778070B1 (ko) 2017-09-13
CN107850756A (zh) 2018-03-27
TW201710735A (zh) 2017-03-16
KR20160134053A (ko) 2016-11-23
TWI601977B (zh) 2017-10-11

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