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WO2013018748A1 - Lentille d'imagerie - Google Patents

Lentille d'imagerie Download PDF

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Publication number
WO2013018748A1
WO2013018748A1 PCT/JP2012/069295 JP2012069295W WO2013018748A1 WO 2013018748 A1 WO2013018748 A1 WO 2013018748A1 JP 2012069295 W JP2012069295 W JP 2012069295W WO 2013018748 A1 WO2013018748 A1 WO 2013018748A1
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WO
WIPO (PCT)
Prior art keywords
lens
imaging
imaging lens
aberration
object side
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/JP2012/069295
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English (en)
Japanese (ja)
Inventor
久保田洋治
久保田賢一
平野整
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.)
Optical Logic Inc
Original Assignee
Optical Logic Inc
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 Optical Logic Inc filed Critical Optical Logic Inc
Publication of WO2013018748A1 publication Critical patent/WO2013018748A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses

Definitions

  • the present invention relates to an imaging lens for forming a subject image on an imaging device such as a CCD sensor or a CMOS sensor, and is provided with an in-vehicle camera, a monitoring camera, a video conference camera, a mobile phone, a digital still camera, a portable information terminal, and a network camera.
  • the present invention relates to an image pickup lens that is suitable for being mounted on an image.
  • in-vehicle cameras such as a back camera that captures the rear of the vehicle when the vehicle is put into the garage or parked, and a drive recorder that captures the front of the vehicle for a certain period of time in preparation for a vehicle accident or the like are rapidly spreading.
  • in-vehicle cameras there is a strong demand for monitoring or viewing a wide range of situations as much as possible, and there is a demand for widening the shooting angle of view, that is, widening the angle.
  • Patent Document 1 discloses a four-lens imaging lens that is relatively small and has a wide angle of view.
  • the imaging lens described in Patent Document 1 includes, in order from the object side, a first lens having a negative refractive power, a second lens having a positive refractive power with a convex surface facing the object side, an aperture, and an image side. And a fourth lens of a positive meniscus lens having a convex surface facing the object side and a fourth lens of a positive meniscus lens having a convex surface facing the object side.
  • the refractive power of each of the second to fourth lenses is limited to 1.7 or more, thereby realizing a reduction in size and a wide angle, although the number of lenses is as small as four.
  • the resolution of the image sensor has been dramatically improved, and it has become necessary to secure sufficient optical performance in accordance with the resolution of the image sensor for an imaging lens mounted on an in-vehicle camera or a surveillance camera.
  • the imaging lens described in Patent Document 1 it is possible to widen the angle with a small number of lenses.
  • the first lens is configured with a lens having a negative refractive power as in the imaging lens described in Patent Document 1, the field curvature and chromatic aberration generated by the first lens are positively refracted. It is necessary to correct by a subsequent lens having power.
  • Such wide angle and good aberration correction are not problems specific to the imaging lens mounted on the above-mentioned in-vehicle camera and surveillance camera, but video conferencing camera, mobile phone, digital still camera, personal digital assistant, network camera This is a common problem in an imaging lens mounted on a camera that is required to have a wide angle while being relatively small.
  • the present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide an imaging lens capable of correcting aberrations satisfactorily while having a wide angle.
  • a first lens having a negative refractive power, a second lens having a positive refractive power, and a positive refractive power are provided.
  • An imaging lens is configured by arranging a third lens and a fourth lens having negative refractive power.
  • the first lens is a lens having a concave surface facing the image surface side
  • the second lens and the third lens are biconvex lenses
  • the fourth lens is a lens having a concave surface facing the object side.
  • the Abbe number from the first lens to the third lens is made larger than 45
  • the Abbe number of the fourth lens is made smaller than 35.
  • the expression of the lens shape such as the “biconvex lens” of the second lens and the third lens, and the “lens with the concave surface facing the object side” of the fourth lens shows the shape in the vicinity of the optical axis of the imaging lens.
  • the second lens and the third lens have a shape in which the curvature radius of the object side surface is positive and the curvature radius of the image side surface is negative
  • the fourth lens has a curvature radius of the object side surface. Is a negative shape.
  • a material having a high refractive index is used for the first lens in order to widen the angle. Since a material having a high refractive index has a small Abbe number, it is necessary to correct on-axis and off-axis chromatic aberration by using a material having a small Abbe number for the second lens. However, in the case of such a lens configuration, since the dispersion of the first lens and the second lens is large, there is a limit to good correction of chromatic aberration. In contrast, in the imaging lens according to the present invention, the Abbe number from the first lens to the third lens is greater than 45, and only the Abbe number of the fourth lens closest to the image plane is smaller than 35.
  • the amount of chromatic aberration generated in the first lens itself is suppressed, and chromatic aberration generated in the first lens is preferably corrected through each lens from the second lens to the fourth lens.
  • the on-axis and off-axis chromatic aberration is suitably corrected by the combination of the shape and dispersion of each lens.
  • Conditional expression (1) is a condition for correcting chromatic aberration better. Below the lower limit of “45”, both on-axis and off-axis chromatic aberrations are undercorrected (short wavelength chromatic aberration increases in the negative direction with respect to the reference wavelength aberration), making it difficult to obtain good imaging performance. It becomes.
  • Conditional expression (2) is a condition for suppressing astigmatism and distortion within a favorable range while reducing the size of the imaging lens.
  • Exceeding the upper limit of “2.0” is advantageous for correcting distortion, but the amount of astigmatism in the sagittal image plane increases in the minus direction (object side), and the astigmatism increases. . Therefore, it is difficult to obtain good imaging performance.
  • the effective diameter of the first lens is increased, and it is difficult to reduce the size of the imaging lens.
  • the value is below the lower limit “1.0”, the refractive power of the first lens becomes relatively strong with respect to the entire lens system, which is advantageous for downsizing the imaging lens.
  • the amount of aberration on the image surface increases in the plus direction (image surface side), and the astigmatic difference increases. Also, negative distortion increases, making it difficult to obtain good imaging performance.
  • Conditional expression (3) is a condition for satisfactorily correcting chromatic aberration and curvature of field while reducing the size of the imaging lens.
  • the refractive power of the first lens becomes relatively strong, which is advantageous for downsizing and widening of the imaging lens, but increases distortion.
  • axial chromatic aberration is insufficiently corrected, making it difficult to obtain good imaging performance.
  • the refractive power of the first lens is increased, the radius of curvature of the surface on the image plane side of the first lens is generally reduced. In this case, in the first lens, the ratio of the maximum effective height to the curvature radius, that is, the so-called hemisphere, increases, so that the workability of the first lens is lowered.
  • the refractive power of the first lens becomes relatively weak, which is advantageous for correcting distortion, but the imaging surface falls to the object side and the curvature of field is increased. Is difficult to correct well. In addition, axial chromatic aberration is insufficiently corrected, making it difficult to obtain good imaging performance. Furthermore, in this case, since the rear focal length of the lens system is shortened, a space for placing an insert, for example, an infrared cut filter or a cover glass, disposed between the imaging lens and the image plane of the imaging device is secured. becomes difficult.
  • Conditional expression (4) is a condition for better correcting chromatic aberration and curvature of field.
  • the upper limit “ ⁇ 0.7” is exceeded, both on-axis and off-axis chromatic aberrations are undercorrected.
  • the sagittal image plane aberration amount of astigmatism increases in the negative direction, and the image plane is tilted to the object side, so that the field curvature is insufficiently corrected. Therefore, it is difficult to obtain good imaging performance.
  • the lower limit “ ⁇ 2.0” the negative refractive power of the fourth lens becomes relatively strong, and the off-axis chromatic aberration is overcorrected (short wavelength chromatic aberration is added to the reference wavelength aberration). Increase in the direction).
  • the amount of aberration of the tangential image surface among the astigmatism increases in the positive direction, and the image plane is tilted to the image plane side, so that the field curvature is overcorrected. Therefore, in this case, it is difficult to obtain good imaging performance.
  • Conditional expression 5 is a condition for satisfactorily correcting astigmatism and field curvature while reducing the size of the imaging lens. If the upper limit “ ⁇ 0.5” is exceeded, the refractive power of the first lens in the entire lens system becomes relatively strong, which is advantageous for downsizing of the imaging lens. The amount of aberration on the image surface increases in the positive direction, and the astigmatic difference increases. Further, the image plane is tilted to the image plane side, and the field curvature is overcorrected. Therefore, it is difficult to obtain good imaging performance. In this case also, since the radius of curvature of the image side surface of the first lens is generally small, the workability of the first lens is lowered.
  • the refractive power of the first lens is relatively weak in the entire lens system, and therefore the object side of the second lens from the image plane side surface of the first lens.
  • the distance to the surface becomes longer, and it is difficult to reduce the size of the imaging lens.
  • the sagittal image plane aberration amount of the astigmatism increases in the negative direction, the astigmatism difference increases, and the image plane is tilted toward the object side, so that the curvature of field becomes insufficiently corrected. Therefore, in this case, it is difficult to obtain good imaging performance.
  • the imaging lens of the present invention it is possible to provide both a wide angle of the imaging lens and good aberration correction, and a small imaging lens in which various aberrations are favorably corrected.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of an imaging lens according to Numerical Example 1 according to an embodiment of the present invention.
  • FIG. 3 is an aberration diagram illustrating lateral aberration of the imaging lens illustrated in FIG. 1.
  • FIG. 2 is an aberration diagram illustrating spherical aberration, astigmatism, and distortion of the imaging lens illustrated in FIG. 1. It is sectional drawing which shows schematic structure of the imaging lens which concerns on numerical example 2 about one embodiment of this invention.
  • FIG. 5 is an aberration diagram showing lateral aberration of the imaging lens shown in FIG. 4.
  • FIG. 5 is an aberration diagram illustrating spherical aberration, astigmatism, and distortion of the imaging lens illustrated in FIG. 4.
  • FIG. 8 is an aberration diagram showing lateral aberration of the imaging lens shown in FIG. 7.
  • FIG. 8 is an aberration diagram illustrating spherical aberration, astigmatism, and distortion of the imaging lens illustrated in FIG. 7.
  • FIG. 11 is an aberration diagram illustrating lateral aberration of the imaging lens illustrated in FIG. 10.
  • FIG. 11 is an aberration diagram illustrating spherical aberration, astigmatism, and distortion of the imaging lens illustrated in FIG. 10.
  • FIG. 4, FIG. 7, and FIG. 10 are cross-sectional views each showing a schematic configuration of an imaging lens according to Numerical Examples 1 to 4 of the present embodiment. Since all the numerical examples have the same basic lens configuration, the lens configuration of the imaging lens according to the present embodiment will be described with reference to a schematic cross-sectional view of the imaging lens according to Numerical Example 1. .
  • the imaging lens of the present embodiment includes a first lens L1 having a negative refractive power and a second lens L2 having a positive refractive power in order from the object side to the image plane side.
  • the third lens L3 having a positive refractive power and the fourth lens L4 having a negative refractive power are arranged.
  • the Abbe number from the first lens L1 to the third lens L3 is a value greater than 45
  • the Abbe number of the fourth lens L4 is a value smaller than 35.
  • a filter 10 is disposed between the fourth lens L4 and the image plane IM. The filter 10 can be omitted.
  • an aperture stop ST is disposed between the first lens L1 and the second lens L2.
  • the aperture stop ST may be disposed between the second lens L2 and the third lens L3.
  • Numerical Examples 1 to 3 are examples in which the aperture stop ST is disposed between the first lens L1 and the second lens L2.
  • the aperture stop ST is the second lens L2 and the third lens. It is an example arrange
  • the first lens L1 is formed in a shape in which a concave surface having a strong refractive power faces the image surface side.
  • the first lens L1 is formed in a shape that becomes a plano-concave lens.
  • the shape of the first lens L1 is not limited to the plano-concave lens, but may be any shape as long as the concave surface is directed to the image surface side.
  • Numerical Example 2 is an example in which the shape of the first lens L1 is a biconcave lens
  • Numerical Examples 3 and 4 are examples in which the shape of the first lens L1 is a meniscus lens having a convex surface facing the object side. .
  • the fourth lens L4 is formed in a shape with a concave surface facing the object side.
  • the fourth lens L4 is formed in a shape to be a biconcave lens.
  • the shape of the fourth lens L4 is not limited to the biconcave lens, but may be any shape as long as the concave surface is directed to the object side.
  • Numerical Examples 1 and 2 are examples in which the shape of the fourth lens L4 is a biconcave lens
  • Numerical Examples 3 and 4 are examples in which the shape of the fourth lens L4 is a meniscus lens having a concave surface facing the object side. It is.
  • the third lens L3 and the fourth lens L4 are arranged in a separated state.
  • the third lens L3 and the fourth lens L4 are not necessarily separated from each other, and may be joined to form a cemented lens.
  • the third lens L3 and the fourth lens L4 are examples of cemented lenses.
  • the imaging lens according to the present embodiment satisfies the following conditional expression. For this reason, according to the imaging lens according to the present embodiment, both widening of the imaging lens and good aberration correction can be achieved.
  • 45 ⁇ d3- ⁇ d4 (1) 1.0 ⁇ dA / f ⁇ 2.0 (2) -1.5 ⁇ f1 / f2 ⁇ -0.5 (3) -2.0 ⁇ f3 / f4 ⁇ -0.7 (4) -2.0 ⁇ f1 / fr ⁇ -0.5 (5)
  • f focal length of the entire lens system
  • f1 focal length of the first lens
  • f2 focal length of the second lens
  • L2 f3 focal length of the third lens
  • L3 f4 focal length of the fourth lens L4 fr: second lens L2 ⁇ Combined focal length of the fourth lens L4 dA: Distance on the optical axis X from the image side surface of the first lens L1 to the object side surface of the second lens L2 ⁇ d3: Abbe number of the third lens L
  • the lens surface of each lens is formed as an aspheric surface as necessary.
  • the aspherical shape adopted for these lens surfaces is that the axis in the optical axis direction is Z, the height in the direction orthogonal to the optical axis is H, the cone coefficient is k, and the aspheric coefficient is A 4 , A 6 , A 8 , A When 10 , it is represented by the following formula.
  • f is a focal length of the entire lens system
  • Fno is an F number
  • ⁇ is a half angle of view in consideration of distortion.
  • i is the surface number counted from the object side
  • R is the radius of curvature
  • d is the inter-surface distance (surface interval) on the optical axis
  • Nd is the refractive index for the d-line
  • ⁇ d is the Abbe number for the d-line.
  • the aspherical surface is indicated by adding a symbol of * (asterisk) after the surface number i.
  • FIG. 2 illustrates the lateral aberration corresponding to the ratio H of each image height to the maximum image height (hereinafter referred to as “image height ratio H”) in the tangential direction and the sagittal direction for the imaging lens of Numerical Example 1.
  • image height ratio H the ratio of each image height to the maximum image height
  • FIG. 3 shows spherical aberration (mm), astigmatism (mm), and distortion (%) for the imaging lens of Numerical Example 1.
  • the lateral aberration diagram and the spherical aberration diagram include g-line (435.84 nm), F-line (486.13 nm), e-line (546.07 nm), d-line (587.56 nm), C-line ( The aberration amount for each wavelength of 656.27 nm is shown, and the astigmatism diagram shows the aberration amount on the sagittal image plane S and the aberration amount on the tangential image plane T (FIGS. 6, 9, and 12). The same).
  • the image plane is corrected well, and various aberrations are preferably corrected.
  • each conditional expression is shown below.
  • the imaging lens according to Numerical Example 2 satisfies the conditional expressions (1) to (5). Further, the distance (air conversion length) on the optical axis X from the object side surface of the first lens L1 to the image plane IM is 11.28 mm, and the imaging lens is downsized.
  • FIG. 5 shows lateral aberration corresponding to the image height ratio H for the imaging lens of Numerical Example 2.
  • FIG. 6 shows spherical aberration (mm), astigmatism (mm), and distortion ( %).
  • the image pickup lens according to Numerical Example 2 also corrects the image plane well and various aberrations are preferably corrected similarly to Numerical Example 1.
  • FIG. 8 shows lateral aberration corresponding to the image height ratio H for the imaging lens of Numerical Example 3
  • FIG. 9 shows spherical aberration (mm), astigmatism (mm), and distortion ( %).
  • the imaging lens according to Numerical Example 3 also corrects the image plane well and various aberrations as well as Numerical Example 1.
  • each conditional expression is shown below.
  • the imaging lens according to Numerical Example 4 satisfies the conditional expressions (1) to (5). Further, the distance (air conversion length) on the optical axis X from the object side surface of the first lens L1 to the image plane IM is 11.44 mm, and the imaging lens is downsized.
  • FIG. 11 shows lateral aberration corresponding to the image height ratio H for the imaging lens of Numerical Example 4.
  • FIG. 12 shows spherical aberration (mm), astigmatism (mm), and distortion ( %).
  • the imaging lens according to Numerical Example 4 also corrects the image plane satisfactorily as in Numerical Example 1, and various aberrations are preferably corrected.
  • the imaging lens according to the above embodiment is applied to an imaging optical system such as an in-vehicle camera, a monitoring camera, a video conference camera, a mobile phone, a digital still camera, a portable information terminal, a network camera, etc.
  • an imaging optical system such as an in-vehicle camera, a monitoring camera, a video conference camera, a mobile phone, a digital still camera, a portable information terminal, a network camera, etc.
  • an imaging optical system such as an in-vehicle camera, a monitoring camera, a video conference camera, a mobile phone, a digital still camera, a portable information terminal, a network camera, etc.
  • an imaging optical system such as an in-vehicle camera, a monitoring camera, a video conference camera, a mobile phone, a digital still camera, a portable information terminal, a network camera, etc.
  • the present invention can be applied to an imaging lens mounted on a device such as an in-vehicle camera, a surveillance camera, a video conference camera, or the like that requires a wide aberration and a good aberration correction capability as an imaging lens.

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

Abstract

L'invention porte sur une lentille d'imagerie, qui est apte à corriger des aberrations sur un grand angle. Pour atteindre cet objectif, la lentille d'imagerie est construite à partir, agencées dans l'ordre depuis le côté objet, d'une première lentille négative (L1) ayant une forme où le rayon de courbure de la surface sur le côté plan d'imagerie est positif, d'une deuxième lentille (L2) ayant une forme qui constitue une lentille biconvexe, d'une troisième lentille (L3) ayant une forme qui constitue de façon similaire une lentille biconvexe, et d'une quatrième lentille négative (L4) ayant une forme où le rayon de courbure de la surface sur le côté objet est négatif. Dans cette structure, le nombre d'Abbe de la première lentille (L1) à la troisième lentille (L3) est supérieur à 45 et le nombre d'Abbe de la quatrième lentille (L4) est inférieur à 35.
PCT/JP2012/069295 2011-08-01 2012-07-30 Lentille d'imagerie Ceased WO2013018748A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011168144 2011-08-01
JP2011-168144 2011-08-01

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WO2013018748A1 true WO2013018748A1 (fr) 2013-02-07

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103852860A (zh) * 2014-02-21 2014-06-11 襄阳锦翔光电科技股份有限公司 一种光学镜头组件
KR20160107438A (ko) * 2015-03-04 2016-09-19 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기
CN106154500A (zh) * 2016-08-30 2016-11-23 广东弘景光电科技股份有限公司 低成本大广角高清光学系统及其应用的镜头
CN111999850A (zh) * 2019-05-27 2020-11-27 宁波舜宇车载光学技术有限公司 光学镜头及成像设备
KR20230127170A (ko) * 2015-11-19 2023-08-31 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기
JP7553727B1 (ja) 2023-07-07 2024-09-18 エーエーシー オプティックス （ソシュウ） カンパニーリミテッド 撮像光学レンズ

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPH04276711A (ja) * 1991-03-05 1992-10-01 Olympus Optical Co Ltd 対物レンズ
JPH05307139A (ja) * 1992-04-28 1993-11-19 Olympus Optical Co Ltd 内視鏡対物レンズ
JPH09138342A (ja) * 1995-11-15 1997-05-27 Konica Corp 小型固体撮像素子用レンズ
JPH09222557A (ja) * 1995-12-12 1997-08-26 Konica Corp 広角レンズ
JPH09281387A (ja) * 1996-04-11 1997-10-31 Konica Corp 撮像レンズ

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04276711A (ja) * 1991-03-05 1992-10-01 Olympus Optical Co Ltd 対物レンズ
JPH05307139A (ja) * 1992-04-28 1993-11-19 Olympus Optical Co Ltd 内視鏡対物レンズ
JPH09138342A (ja) * 1995-11-15 1997-05-27 Konica Corp 小型固体撮像素子用レンズ
JPH09222557A (ja) * 1995-12-12 1997-08-26 Konica Corp 広角レンズ
JPH09281387A (ja) * 1996-04-11 1997-10-31 Konica Corp 撮像レンズ

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103852860A (zh) * 2014-02-21 2014-06-11 襄阳锦翔光电科技股份有限公司 一种光学镜头组件
KR20160107438A (ko) * 2015-03-04 2016-09-19 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기
KR102424948B1 (ko) 2015-03-04 2022-07-25 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기
KR20230127170A (ko) * 2015-11-19 2023-08-31 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기
KR102823515B1 (ko) 2015-11-19 2025-06-23 엘지이노텍 주식회사 촬상 렌즈, 이를 포함하는 카메라 모듈 및 디지털 기기
CN106154500A (zh) * 2016-08-30 2016-11-23 广东弘景光电科技股份有限公司 低成本大广角高清光学系统及其应用的镜头
CN111999850A (zh) * 2019-05-27 2020-11-27 宁波舜宇车载光学技术有限公司 光学镜头及成像设备
JP7553727B1 (ja) 2023-07-07 2024-09-18 エーエーシー オプティックス （ソシュウ） カンパニーリミテッド 撮像光学レンズ
JP2025010465A (ja) * 2023-07-07 2025-01-21 エーエーシー オプティックス （ソシュウ） カンパニーリミテッド 撮像光学レンズ

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