WO2009061153A2 - Objectif à 5 éléments - Google Patents

Objectif à 5 éléments Download PDF

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Publication number
WO2009061153A2
WO2009061153A2 PCT/KR2008/006577 KR2008006577W WO2009061153A2 WO 2009061153 A2 WO2009061153 A2 WO 2009061153A2 KR 2008006577 W KR2008006577 W KR 2008006577W WO 2009061153 A2 WO2009061153 A2 WO 2009061153A2
Authority
WO
WIPO (PCT)
Prior art keywords
lens
image
image pickup
positive
negative
Prior art date
Application number
PCT/KR2008/006577
Other languages
English (en)
Other versions
WO2009061153A3 (fr
Inventor
Jin Oh Yang
Original Assignee
Microptics Co., Ltd.
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
Priority claimed from KR1020080109479A external-priority patent/KR101111204B1/ko
Application filed by Microptics Co., Ltd. filed Critical Microptics Co., Ltd.
Publication of WO2009061153A2 publication Critical patent/WO2009061153A2/fr
Publication of WO2009061153A3 publication Critical patent/WO2009061153A3/fr

Links

Classifications

    • 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
    • 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 -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

Definitions

  • the present invention relates to an image pickup lens system which can be mounted to a mobile device and, more particularly, to a high-pixel image pickup lens system having five lenses, which can be mounted to a mobile device having five or more million pixels.
  • ⁇ digital cameras' which enable image information to be input to such personal computers have become rapidly popularized.
  • a mobile phone which has been equipped with a camera having a small-sized image pickup module, has also become rapidly popularized.
  • a small-sized information terminal such as a Personal Digital Assistant (PDA) , to which such an image pickup module has been mounted, has been popularized.
  • PDA Personal Digital Assistant
  • an image pickup element such as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS)
  • CCD Charge Coupled Device
  • CMOS Complementary Metal Oxide Semiconductor
  • This image pickup element is made to be very small.
  • an image pickup device using such an image pickup element such as a CCD
  • an image pickup element having a large number of pixels, has been developed to realize high-quality images. Accordingly, in a lens system as well, high-resolution and high-contrast performance is required.
  • the image pickup element is made small and has a large number of pixels. Accordingly, a high-resolution and compact image pickup lens is required, particularly for the image pickup lens system of a digital camera. Meanwhile, in a conventional image pickup lens system for a small-sized information terminal, such as a camera-equipped mobile phone, it is required to reduce the cost and size thereof. However, in the camera-equipped mobile phone, the recent trend is toward increasing the number of pixels of the image pickup element.
  • a lens system having three lenses is used for an image pickup element having three million pixels, and a lens system having four lenses is used for an image pickup element having five or more million pixels.
  • an optical system is designed by actively taking advantage of aspherical lenses.
  • a mobile optical system using three lenses and a mobile optical system using four lenses are respectively disclosed in Korean Pat. No. 843467
  • FIG. 1 shows an example of a conventional lens system having four lenses .
  • the conventional lens system includes a first lens Ll having a positive power, a second lens L2 having a negative power, a third lens L3 having a positive power, a fourth lens L4 having a negative power, and an IR filter 1.
  • the conventional lens system having four lenses is problematic in that the sensitivity of the fourth lens L4, which is designed by actively taking advantage of the aspherical surfaces, is excessively increased, and thus assembling efficiency and productivity are lowered.
  • an object of the present invention is to provide a high-pixel lens system having five lenses.
  • Another object of the present invention is to provide a new lens system, which not only enables the realization of a high pixel lens system having five lenses, but also enables a reduction in the total length thereof.
  • a further object of the present invention is to provide a new lens system, which not only enables the realization of a high pixel lens system having five lenses, but also enables the coating of an IR filter.
  • the present invention provides an image pickup lens system, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens, which are sequentially arranged from an object side, wherein: the first lens is a lens having a positive power, and is configured such that the convex surface thereof is oriented toward the object side; the second lens is a meniscus having a negative power, and is configured such that the concave surface thereof is oriented toward an image side; the third lens is a meniscus having a positive power, and is configured such that the convex surface thereof is oriented toward the image side; the fourth lens is a lens having a negative power, and is configured such that one or more surfaces thereof are made aspherical and such that the image-side surface thereof is made concave in the vicinity of an optical axis; the fifth lens is a lens having a positive or negative power, and is configured such that both surfaces thereof are made spherical, or such that one surface thereof is made aspherical and the
  • the first and second lenses be configured to satisfy the following conditions (1) and (2) for the Abbe numbers thereof.
  • the fourth lens be configured to satisfy the following condition (3) .
  • the conditions are: ⁇ dl > 50 (1) 20 ⁇ ⁇ d2 ⁇ 40 (2) ⁇ d4 > 50 (3) where ⁇ dl, ⁇ d2 and ud4 are respective Abbe numbers of the first, second and fourth lenses.
  • the first and second lenses be configured to satisfy the following condition (4) for the difference between the Abbe numbers thereof. It is preferred that the second lens be configured to satisfy the following condition (5) for the curvature thereof.
  • the conditions are: ⁇ dl - ⁇ d2 > 15.0 (4)
  • the fifth lens in order to decrease the chromatic aberration of the image pickup lens system, it is preferred that the fifth lens be configured to satisfy the following condition (6) for the Abbe number thereof.
  • the condition is : ⁇ d5 ⁇ 50 (6) where ⁇ d5 is an Abbe number of the fifth lens.
  • the first lens is a lens having a positive power, and is configured such that the convex surface thereof is oriented toward the object side.
  • the first lens be configured to satisfy the following condition (7).
  • the condition is:
  • the second lens is a meniscus having a negative power, and is configured such that the concave surface thereof is oriented toward the image side.
  • the second lens In order to increase the resolution of the entire lens system by decreasing the axial chromatic aberration, it is preferred that the second lens have an Abbe number that is smaller than that of the first lens by fifteen or more, preferably by twenty or more, as in the above-described condition (4).
  • the third lens is a meniscus having a positive power, and is configured such that the convex surface thereof is oriented toward the image side, the object-side surface is made spherical, and the image-side surface thereof is made aspherical .
  • the third lens be configured to satisfy the following condition (8) for the Abbe numbers thereof. ⁇ d3 - ⁇ d2 > 15.0 (8) where ⁇ d2 and ⁇ d3 are respective Abbe numbers of the second and third lenses .
  • the power of the third lens is determined to satisfy the following condition (9) .
  • the reason for this is to favorably correct the spherical aberration or the coma aberration and realize a compact optical system.
  • the condition is:
  • the fourth lens may be configured such that one or more surfaces thereof (preferably both) are made aspherical, and the image-side surface thereof is made concave in the vicinity of the optical axis thereof. Accordingly, the coma and astigmatic aberrations of the entire lens system can be favorably corrected and, in addition, the distortion can be favorably corrected.
  • the fifth lens may have a positive or negative power.
  • the fifth lens may be configured such that both surfaces thereof are made spherical, or may be configured such that one surface thereof is made aspherical and the remaining surface thereof is made spherical or planar. Accordingly, the sensitivity attributable to an aspherical surface can be lowered and, in addition, a core can be easily manufactured.
  • the fifth lens in order to decrease the sensitivity that affects 0.3 ⁇ 0.5 F, it is preferred that the fifth lens be configured such that object-side surface is made aspherical and such that the image-side surface is made planar.
  • an IR filter may be directly applied to the lens so as to decrease the total length of the image pickup lens system.
  • an IR filter in the case where the image-side surface of the fifth lens is made planar, an IR filter may be disposed to be in contact with the image-side surface.
  • the fifth lens in order to decrease the chromatic aberration of the image pickup lens system, it is preferred that the fifth lens be configured to satisfy the following condition. More preferably, the Abbe number of the fifth lens is smaller than that of the fourth lens by twenty or more. The condition is : ud5 ⁇ 50 (10) where ud5 is an Abbe number of the fifth lens.
  • the image pickup lens system may employ a separate filter.
  • an IR filter layer may be applied to the image-side surface of the fifth lens so as to remove infrared light.
  • a high-pixel image pickup lens system can be realized using the fifth lens and, in addition, the space that is necessary for the IR filter can be reduced. Accordingly, the image pickup lens system has a total length identical to that of a lens system having four lenses.
  • the image pickup lens system in order to prevent the total length from being increased, it is preferred that the image pickup lens system be configured to satisfy the following condition (11) for the focal length and the total length.
  • TL denotes the total length between an iris diaphragm and an image pickup surface.
  • the image pickup lens system according to the present invention is an optical system that is basically constructed using five lenses, and can be applied to five or more million pixels so as to overcome limitations on the aberration correction and the resolution of a conventional image pickup lens system having three or four lenses .
  • Both surfaces of the fifth lens are made spherical or one surface of the fifth lens is made aspherical, so that the image pickup lens system according to the present invention can reduce the sensitivity compared with the conventional image pickup lens system using a lens, both surfaces of which are made aspherical, thus easily achieving the high performance that is obtained by using five lenses while maintaining the sensitivity that is obtained by using four lenses.
  • FIG. 1 is a sectional view of a conventional lens system having four lenses
  • FIG. 2 is a sectional view of an image pickup lens system having five lenses, according to a first embodiment of the present invention
  • FIG. 3 is a sectional view of an image pickup lens system having five lenses, according to a second embodiment of the present invention.
  • FIG. 4 is a view showing the aberration of an image pickup lens system according to a comparison embodiment of the present invention.
  • FIG. 5 is a view showing the aberration of the image pickup lens system according to the first embodiment of the present invention.
  • FIG. 6 is a view showing the coma aberration of the image pickup lens system according to the first embodiment of the present invention. [Best Mode]
  • FIG. 2 shows an image pickup lens system having five lenses according to a first embodiment of the present invention, in which a fifth lens has a negative refractive index.
  • the image pickup lens system 100 includes an iris diaphragm ⁇ a, ' a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4, a fifth lens 5, and an IR filter 6, which are sequentially arranged in the direction toward the image side of an image plane from an object side.
  • the first lens 1 is a lens having a positive power, and is configured such that the convex surface thereof is located close to the iris diaphragm ⁇ a' and oriented toward the object side.
  • the second lens 2 is a meniscus having a negative power and is configured such that the concave surface thereof is oriented toward the image side.
  • the third lens 3 is a meniscus having a positive power, and is configured such that the convex surface thereof is oriented toward the image side, such that the object-side surface thereof is made spherical, and such that the image-side surface thereof is made aspherical.
  • the fourth lens 4 is a lens having a negative power, and is configured such that both the object-side and image-side surfaces thereof are made aspherical, and such that the image-side surface thereof is made concave in the vicinity of the optical axis.
  • the fifth ' lens 5 is a lens having a negative power, and is configured such that the object-side surface thereof is made aspherical and such that the image-side surface thereof is made planar.
  • the IR filter 6 is disposed between the fifth lens and the image plane.
  • the overall optical system data of the image pickup lens system 100 according to the present embodiment are given as follows.
  • the focal length fl of the first lens 2.83 mm
  • the focal length f5 of the fifth lens -29.79 mm
  • the symbol * denotes an aspherical surface.
  • the image-side surface of the third lens, both surfaces of the fourth lens, and the object-side surface of the fifth lens are made aspherical, and the image-side surface of the fifth lens is made planar.
  • FIG. 3 shows an image pickup lens system according to a second embodiment of the present invention.
  • FIG. 3 shows a case where both surfaces of the fifth lens of the image pickup lens system are made spherical.
  • the image pickup lens system 100 includes an iris diaphragm ⁇ a, ' a first lens 1, a second lens 2, a third lens 3, and a fourth lens 4, a fifth lens 5, and an IR filter 6, which are sequentially arranged in the direction toward the image side of an image plane from an object side.
  • the first lens 1 is a lens having a positive power, and is configured such that the convex surface thereof is located close to the iris diaphragm ⁇ a' and oriented toward the object side.
  • the second lens 2 is a meniscus having a negative power, and is configured such that the concave surface thereof is oriented toward the image side.
  • the third lens 3 is a meniscus having a positive power, and is configured such that the convex surface thereof is oriented toward the image side, such that the object-side surface thereof is made spherical, and such that the image-side surface thereof is made aspherical.
  • the fourth lens 4 is a lens having a negative power, and is configured such that both the object-side and image-side surfaces thereof are made aspherical, and such that the image-side surface thereof is made concave in the vicinity of the optical axis.
  • the fifth lens 5 is a lens having a negative power and is configured such that both the object-side and image-side surfaces thereof are made spherical.
  • the IR filter 6 is disposed between the fifth lens and the image plane.
  • the overall optical system data of the image pickup lens system 100 according to the present embodiment are given as follows.
  • the focal length fl of the first lens 2.83 mm
  • the focal length f5 of the fifth lens -23.88 mm
  • the length TL from the iris diaphragm to the image plane 5.40 mm Table 3
  • the symbol * denotes an aspherical surface.
  • the image-side surface of the third lens and both surfaces of the fourth lens are made aspherical, and both surfaces of the fifth lens are made spherical .
  • Aspherical coefficients are given by the following Table 4.
  • FIG. 5 is a view showing the aberration of the lens system according to the first embodiment of the present invention.
  • Z denotes the sag amount
  • C denotes the curvature of a lens surface at the optical axis
  • K denotes the conic coefficient
  • A, B, C, D, E and F denote fourth-order to fourteenth-order aspherical coefficients
  • C 1/R.
  • Conditions in the comparison embodiment are the same as those in the first embodiment except that the Abbe number of the second lens is changed to 55.7. In this state, the aberration of a lens system according to the comparison embodiment is measured and is shown in FIG. 4.

Abstract

L'invention concerne un système multilentilles de prise de vues. Ledit système comprend une première lentille, une deuxième lentille, une troisième lentille, une quatrième lentille et une cinquième lentille, qui sont séquentiellement agencées à partir d'un côté objet. La première lentille est conçue de telle sorte que sa surface convexe est orientée vers le côté objet. La deuxième lentille est conçue de telle sorte que sa surface concave est orientée vers un côté image. La troisième lentille est conçue de telle sorte que sa surface convexe est orientée vers le côté image. La quatrième lentille est conçue de telle sorte qu'une ou plusieurs de ses surfaces sont asphériques et de sorte que sa surface côté image est concave à proximité d'un axe optique. La cinquième lentille est conçue de telle sorte que ses deux surfaces sont sphériques, ou qu'une des surfaces est asphérique et l'autre surface restante est sphérique ou plane.
PCT/KR2008/006577 2007-11-08 2008-11-07 Objectif à 5 éléments WO2009061153A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20070113592 2007-11-08
KR10-2007-0113592 2007-11-08
KR1020080109479A KR101111204B1 (ko) 2008-11-05 2008-11-05 5매 촬상 렌즈
KR10-2008-0109479 2008-11-05

Publications (2)

Publication Number Publication Date
WO2009061153A2 true WO2009061153A2 (fr) 2009-05-14
WO2009061153A3 WO2009061153A3 (fr) 2009-07-02

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PCT/KR2008/006577 WO2009061153A2 (fr) 2007-11-08 2008-11-07 Objectif à 5 éléments

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9335517B2 (en) 2009-07-14 2016-05-10 Largan Precision Co., Ltd. Imaging lens system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR830008187A (ko) * 1980-10-31 1983-11-16 로놀드 제이 클라아크 광구경 대물랜즈
KR950019806A (ko) * 1993-12-24 1995-07-24 김광호 비구면 렌즈를 사용한 망원 광학계
KR19980025176A (ko) * 1996-09-30 1998-07-06 요시다 쇼이치로 변배 광학계
KR20030029489A (ko) * 2001-10-05 2003-04-14 펜탁스 가부시키가이샤 줌렌즈 시스템
KR20070097369A (ko) * 2006-03-28 2007-10-04 후지논 가부시키가이샤 촬상렌즈

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3247756B2 (ja) * 1993-03-12 2002-01-21 オリンパス光学工業株式会社 広角写真レンズ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR830008187A (ko) * 1980-10-31 1983-11-16 로놀드 제이 클라아크 광구경 대물랜즈
KR950019806A (ko) * 1993-12-24 1995-07-24 김광호 비구면 렌즈를 사용한 망원 광학계
KR19980025176A (ko) * 1996-09-30 1998-07-06 요시다 쇼이치로 변배 광학계
KR20030029489A (ko) * 2001-10-05 2003-04-14 펜탁스 가부시키가이샤 줌렌즈 시스템
KR20070097369A (ko) * 2006-03-28 2007-10-04 후지논 가부시키가이샤 촬상렌즈

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9335517B2 (en) 2009-07-14 2016-05-10 Largan Precision Co., Ltd. Imaging lens system
US9435984B2 (en) 2009-07-14 2016-09-06 Largan Precision Co., Ltd. Imaging lens system
US9465197B2 (en) 2009-07-14 2016-10-11 Largan Precision Co., Ltd. Imaging lens system

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