WO2012086890A1 - Système d'objectif zoom - Google Patents

Système d'objectif zoom Download PDF

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Publication number
WO2012086890A1
WO2012086890A1 PCT/KR2011/005202 KR2011005202W WO2012086890A1 WO 2012086890 A1 WO2012086890 A1 WO 2012086890A1 KR 2011005202 W KR2011005202 W KR 2011005202W WO 2012086890 A1 WO2012086890 A1 WO 2012086890A1
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WO
WIPO (PCT)
Prior art keywords
lens
refractive power
lens system
zoom lens
lens group
Prior art date
Application number
PCT/KR2011/005202
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English (en)
Inventor
Byoung-Guy Lee
Original Assignee
Samsung Techwin 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
Application filed by Samsung Techwin Co., Ltd. filed Critical Samsung Techwin Co., Ltd.
Publication of WO2012086890A1 publication Critical patent/WO2012086890A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
    • G02B15/1425—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only the first group being negative
    • 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
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/0087—Simple or compound lenses with index gradient
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Definitions

  • the present invention relates to a zoom lens system.
  • image capturing devices including a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) sensor, such as digital cameras, video cameras, security cameras, and cellular phone cameras, are to have increasingly greater data storage capacities.
  • CMOS complementary metal oxide semiconductor
  • lens systems for such image capturing devices are required to have increasingly higher optical performances as the data storage capacities of the digital image capturing devices increase, and there is increasing demand for smaller image capturing devices.
  • the present invention provides a zoom lens system including two lens groups.
  • a zoom lens system including: a first lens group including a first lens having negative refractive power, a second lens having negative refractive power, and a third lens having positive refractive power that are sequentially arranged in a direction from an object side to an image side, the first lens group having negative refractive power; and a second lens group including a fourth lens having positive refractive power, a fifth lens having positive refractive power, a sixth lens having negative refractive power, a seventh lens having positive refractive power, and an eighth lens having positive refractive power that are sequentially arranged in the direction from the object side to the image side, the second lens group having positive refractive power, wherein zooming is performed by varying a distance between the first and second lens groups.
  • the fifth lens may satisfy the formula
  • vd5 denotes an Abbe number of the fifth lens with respect to a d-line.
  • the fourth lens may satisfy the formula
  • nd4 denotes a refractive index of the fourth lens with reference to a d-line.
  • the first lens group may satisfy the formula
  • f I denotes a focal length of the first lens group
  • fw denotes a total focal length of the zoom lens system at a wide angle end.
  • the second lens group may satisfy the formula
  • v(G2+) denotes an average of Abbe numbers of the lenses of the second lens group that have positive refractive power.
  • At least one of the first and second lens groups may include an aspherical surface.
  • the third lens may include at least one aspherical surface.
  • At least one of the fourth lens and the eighth lens may include an aspherical surface.
  • the fourth lens may include an aspherical surface facing the object side.
  • the fourth lens may include an aspherical surface facing the image side.
  • the first lens group may be moved toward the image side and the second lens group may be moved toward the object side for zooming from a wide angle end to a telephoto end.
  • the zoom lens system may further include an aperture between the first and second lens groups.
  • the aperture may not be moved during zooming.
  • a zoom lens system including: a first lens group having negative refractive power; and a second lens group having positive refractive power, wherein the first and second lens groups are sequentially arranged from an object side to an image side, and zooming is performed by varying a distance between the first and second lens groups, wherein the second lens group satisfies the formula
  • nd21 denotes a refractive index of a first lens of the second lens group from the object side measured with reference to a d-line
  • vd22 is an Abbe number of a second lens of the second lens group from the object side measured with reference to the d-line.
  • a zoom lens system can have relatively high resolution in a peripheral region as well as in a central region.
  • chromatic aberration from a wide angle end to a telephoto end of a zoom lens system can be properly compensated for in a visible light band.
  • a zoom lens system can have a relatively wide viewing angle, relatively few lenses, and a relatively small size.
  • FIG. 1 is a schematic view illustrating a zoom lens system according to an embodiment of the present invention
  • FIGS. 2A through 2C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a wide angle end of the zoom lens system illustrated in FIG. 1;
  • FIGS. 3A through 3C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a telephoto end of the zoom lens system illustrated in FIG. 1;
  • FIG. 4 is a schematic view illustrating a zoom lens system according to another embodiment of the present invention.
  • FIGS. 5A through 5C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a wide angle end of the zoom lens system illustrated in FIG. 4;
  • FIGS. 6A through 6C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a telephoto end of the zoom lens system illustrated in FIG. 4;
  • FIG. 7 is a schematic view illustrating a zoom lens system according to another embodiment of the present invention.
  • FIGS. 8A through 8C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a wide angle end of the zoom lens system illustrated in FIG. 7;
  • FIGS. 9A through 9C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a telephoto end of the zoom lens system illustrated in FIG. 7;
  • FIG. 10 is a schematic view illustrating a zoom lens system according to another embodiment of the present invention.
  • FIGS. 11A through 11C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a wide angle end of the zoom lens system illustrated in FIG. 10;
  • FIGS. 12A through 12C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at a telephoto end of the zoom lens system illustrated in FIG. 10.
  • FIG. 1 is a schematic view illustrating a zoom lens system according to an embodiment of the present invention.
  • the zoom lens system of the current embodiment includes a first lens group G1, an aperture ST, and a second lens group G2 that are arranged in a direction from an object side (O) to an image side (I). At least one of the first and second lens groups G1 and G2 may include at least one aspherical surface.
  • the first lens group G1 has negative refractive power.
  • the first lens group G1 may include a first lens 11, a second lens 12, and a third lens 13.
  • the first and second lenses 11 and 12 may each have negative refractive power, and the third lens 13 may have positive refractive power.
  • the positive refractive power lens of the first lens group G1 may have an aspherical surface.
  • a surface of the third lens 13 facing the object side (O) or the image side (I) may be aspherical. In this case, coma may be effectively reduced, and relatively high resolution may be obtained at a peripheral region as well as at a center region.
  • the second lens group G2 has positive refractive power.
  • the second lens group G2 may include a fourth lens 21, a fifth lens 22, a sixth lens 23, a seventh lens 24, and an eighth lens 25.
  • the fourth lens 21, the fifth lens 22, the seventh lens 24, and the eighth lens 25 may each have positive refractive power, and the sixth lens 23 may have negative refractive power.
  • the second lens group G2 may include at least one aspherical surface.
  • a surface of the second lens group G2 closest to the image side (I) may be aspherical.
  • a surface of the lens group G1 closest to the object side (O) and the surface of the lens group G2 closest to the image side (I) may be aspherical.
  • the aperture (ST) may be disposed between the first and second lens groups G1 and G2.
  • a reference numeral 30 denotes an optical filter.
  • the first and second lens groups G1 and G2 may be moved for zooming.
  • the first lens group G1 When zooming from a wide angle end to a telephoto end, the first lens group G1 is moved toward the image side (I), and the second lens group G2 is moved toward the object side (O).
  • the first lens group G1 may be moved toward the image side (I) (or the second lens group G2) in a parabolic manner, and the second lens group G2 may be moved toward the object side (O) (or the first lens group G1) in a linear manner.
  • the aperture ST may be kept at a fixed position.
  • an F-number of the zoom lens system may be 1.25 or less.
  • the zoom lens system of the current embodiment may satisfy the following conditions.
  • the second lens group G2 of the current embodiment may satisfy Formula 1:
  • vd22 denotes an Abbe number of the second lens of the second lens group G2 from the object side (O) measured with respect to a d-line.
  • vd22 denotes an Abbe number of the fifth lens 22 of the second lens group G2 measured with reference to the d-line.
  • the second lens group G2 of the current embodiment may satisfy Formula 2:
  • v(G2+) denotes an average of Abbe numbers of the lenses of the second lens group G2 having positive refractive power.
  • the second lens group G2 of the current embodiment may satisfy Formula 3:
  • nd21 denotes a refractive index of the lens of the second lens group G2 closest to the object side (O), measured with respect to the d-line.
  • nd21 denotes a refractive index of the fourth lens 21 of the second lens group G2 measured with respect to the d-line.
  • first lens group G1 of the current embodiment may satisfy Formula 4:
  • f I denotes a focal length of the first lens group G1
  • fw denotes a total focal length of the zoom lens system at the wide angle end.
  • a ratio of the focal length of the first lens group G1 to the total focal length of the zoom lens system at the wide angle end is equal to or greater than the upper limit, a magnification of the first lens group G1 is relatively high but aberrations of the first lens group G1 are increased and thus resolution of the zoom lens system is relatively low. If the ratio is equal to or less than the lower limit, a field of view and a magnification of the zoom lens system are relatively low. Moreover, a length of the zoom lens system is relatively long, and thus it is difficult to reduce a size of the zoom lens system.
  • a direction along an optical axis is defined as an x-axis
  • a direction perpendicular to the x-axis is defined as a y-axis
  • a direction in which a light ray propagates is denoted as a positive direction.
  • an aspherical shape of a zoom lens can be expressed by the following equation in which x denotes a distance along the x-axis from a vertex of the lens, y denotes a distance along the y-axis, k denotes a conic constant, A, B, C, and D denote aspherical coefficients, and c denotes a reciprocal (1/R) of a radius of curvature of the vertex of the lens.
  • EFL denotes an effective focal length
  • Fno denotes an F-number
  • FOV denotes a field of view
  • D6, D7, and D17 denote variable distances.
  • R denotes a radius of curvature
  • Dn denotes a central thickness of a lens or a distance between lenses
  • nd denotes a refractive index of a material
  • vd denotes an Abbe number of a material
  • ASP denotes an aspherical surface.
  • the optical filter 30 may be disposed between the eighth lens 25 and an imaging surface, and S18 and S19 denote two surfaces of the optical filter 30.
  • Table 2 below shows aspherical coefficients of the zoom lens system illustrated in FIG. 1
  • Table 3 below shows effective focal lengths EFL, F-numbers Fno, fields of view FOV, and variable distances D6, D7, and D17 at the wide angle end and the telephoto end of the zoom lens system illustrated in FIG 1.
  • variable distance D6 is a distance from a surface S6 of the third lens 13 closest to the image side (I) to the aperture ST
  • variable distance D7 is a distance from the aperture ST to a surface S8 of the fourth lens 21 closest to the object side (O)
  • variable distance D17 is a distance from a surface S17 of the eighth lens 25 closest to the image side (I) to the surface S18 of the optical filter 30, which is a surface of the optical filter 30 closest to the object side (O).
  • FIGS. 2A through 3C are graphs illustrating aberrations at the wide angle end and the telephoto end of the zoom lens system of FIG. 1.
  • FIGS. 2A through 2C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the wide angle end of the zoom lens system of FIG. 1, respectively.
  • FIGS. 3A through 3C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens system of FIG. 1, respectively.
  • the graphs illustrating longitudinal spherical aberration are plotted with respect to light having wavelengths of about 656.2725 nm (c-line), about 587.5600 nm (d-line), about 546.0700 nm (e-line), about 486.1300 nm (f-line), and about 435.8400 nm (g-line).
  • the graphs illustrating astigmatism and distortion are plotted with respect to light having a wavelength of about 546.0700 nm (e-line).
  • astigmatic field curves include a tangential astigmatic field curve denoted by a dotted line and a sagittal astigmatic filed curve denoted by a solid line.
  • Table 4 below shows data for designing a zoom lens system illustrated in FIG. 4 according to another embodiment of the present invention.
  • an optical filter 30 may be disposed between an eighth lens 25 and an imaging surface, and S18 and S19 denote two surfaces of the optical filter 30.
  • Table 5 below shows aspherical coefficients of the zoom lens system illustrated in FIG. 4, and Table 6 below shows effective focal lengths EFL, F-numbers Fno, fields of view FOV, and variable distances D6, D7, and D17 at a wide angle end and a telephoto end of the zoom lens system illustrated in FIG. 4.
  • FIGS. 5A through 6C are graphs illustrating aberrations at the wide angle end and the telephoto end of the zoom lens system of FIG. 4.
  • FIGS. 5A through 5C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the wide angle end of the zoom lens system of FIG. 4, respectively.
  • FIGS. 6A through 6C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens system of FIG. 4, respectively.
  • the graphs illustrating longitudinal spherical aberration are plotted with respect to light having wavelengths of about 656.2725 nm, about 587.5600 nm, about 546.0700 nm, about 486.1300 nm, and about 435.8400 nm.
  • the graphs illustrating astigmatism and distortion are plotted with respect to light having a wavelength of about 546.0700 nm.
  • astigmatic field curves include a tangential astigmatic field curve denoted by a dotted line and a sagittal astigmatic filed curve denoted by a solid line.
  • Table 7 below shows data for designing a zoom lens system illustrated in FIG. 7 according to another embodiment of the present invention.
  • an optical filter 30 may be disposed between an eighth lens 25 and an imaging surface, and S18 and S19 denote two surfaces of the optical filter 30.
  • Table 8 below shows aspherical coefficients of the zoom lens system illustrated in FIG. 7, and Table 9 below shows effective focal lengths EFL, F-numbers Fno, fields of view FOV, and variable distances D6, D7, and D17 at a wide angle end and a telephoto end of the zoom lens system illustrated in FIG. 7.
  • FIGS. 8A through 9C are graphs illustrating aberrations at the wide angle end and the telephoto end of the zoom lens system of FIG. 7.
  • FIGS. 8A through 8C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the wide angle end of the zoom lens system of FIG. 7, respectively.
  • FIGS. 9A through 9C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens system of FIG. 7, respectively.
  • the graphs illustrating longitudinal spherical aberration are plotted with respect to light having wavelengths of about 656.2725 nm, about 587.5600 nm, about 546.0700 nm, about 486.1300 nm, and about 435.8400 nm.
  • the graphs illustrating astigmatism and distortion are plotted with respect to light having a wavelength of about 546.0700 nm.
  • astigmatic field curves include a tangential astigmatic field curve denoted by a dotted line and a sagittal astigmatic filed curve denoted by a solid line.
  • Table 10 below shows data for designing a zoom lens system illustrated in FIG. 10 according to another embodiment of the present invention.
  • an optical filter 30 may be disposed between an eighth lens 25 and an imaging surface, and S18 and S19 denote two surfaces of the optical filter 30.
  • Table 11 shows aspherical coefficients of the zoom lens system illustrated in FIG. 10, and Table 12 below shows effective focal lengths EFL, F-numbers Fno, fields of view FOV, and variable distances D6, D7, and D17 at a wide angle end and a telephoto end of the zoom lens system illustrated in FIG. 10.
  • FIGS. 11A through 12C are graphs illustrating aberrations at the wide angle end and the telephoto end of the zoom lens system of FIG. 10.
  • FIGS. 11A through 11C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the wide angle end of the zoom lens system of FIG. 10, respectively.
  • FIGS. 12A through 12C are graphs illustrating longitudinal spherical aberration, astigmatism, and distortion at the telephoto end of the zoom lens system of FIG. 10, respectively.
  • the graphs illustrating longitudinal spherical aberration are plotted with respect to light having wavelengths of about 656.2725 nm, about 587.5600 nm, about 546.0700 nm, about 486.1300 nm, and about 435.8400 nm.
  • the graphs illustrating astigmatism and distortion are plotted with respect to light having a wavelength of about 546.0700 nm.
  • astigmatic field curves include a tangential astigmatic field curve denoted by a dotted line and a sagittal astigmatic filed curve denoted by a solid line.
  • zoom lens systems of the embodiments illustrated with reference to FIGS. 1, 4, 7, and 10 satisfy the conditions expressed by Formulas 1 through 4, as follows.
  • a zoom lens system can have a relatively high zoom magnification and a relatively small size and be manufactured with relatively low costs.
  • the zoom lens system of the present invention may be applied to image capturing devices such as security cameras, digital still cameras, single-lens reflex cameras, video cameras, and cellular phones, which have solid-state imaging capturing devices such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) sensor.
  • CCD charge-coupled device
  • CMOS complementary metal oxide semiconductor

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

L'invention porte sur un système d'œil-de-poisson et sur un dispositif de capture d'image qui comprend le système d'œil-de-poisson. Un système d'objectif zoom comprend un premier système de lentilles et un second système de lentilles. Le premier groupe de lentilles comprend une première lentille ayant une puissance de réfraction négative, une deuxième lentille ayant une puissance de réfraction négative, et une troisième lentille ayant une puissance de réfraction positive, qui sont disposées en séquence dans une direction à partir d'un côté objet jusqu'à un côté image. Le premier groupe de lentilles a une puissance de réfraction négative. Le second groupe de lentilles comprend une quatrième lentille ayant une puissance de réfraction positive, une cinquième lentille ayant une puissance de réfraction positive, une sixième lentille ayant une puissance de réfraction négative, une septième lentille ayant une puissance de réfraction positive et une huitième lentille ayant une puissance de réfraction positive, qui sont disposées en séquence dans la direction à partir du côté objet jusqu'au côté image. Le second groupe de lentilles a une puissance de réfraction positive. Un zoom est effectué en faisant varier une distance entre les premier et second groupes de lentilles.
PCT/KR2011/005202 2010-12-24 2011-07-15 Système d'objectif zoom WO2012086890A1 (fr)

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CN104570280A (zh) * 2013-10-14 2015-04-29 三星电机株式会社 镜头模块
US9146389B2 (en) 2013-01-11 2015-09-29 Hanwha Techwin Co., Ltd. Zoom lens system
CN107728299A (zh) * 2013-04-30 2018-02-23 扬明光学股份有限公司 变焦镜头
US10018805B2 (en) 2013-10-14 2018-07-10 Samsung Electro-Mechanics Co., Ltd. Lens module
CN110328445A (zh) * 2019-07-12 2019-10-15 卡门哈斯激光科技（苏州）有限公司 一种近红外单色物镜
CN110346895A (zh) * 2018-04-02 2019-10-18 中强光电股份有限公司 定焦镜头
CN112269241A (zh) * 2020-11-20 2021-01-26 四川长虹电器股份有限公司 一种适用于dlp光固化3d打印的投影镜头
US11668909B2 (en) 2015-08-11 2023-06-06 Largan Precision Co., Ltd. Photographing optical lens system, image capturing unit and electronic device
US12007536B2 (en) 2015-08-11 2024-06-11 Largan Precision Co., Ltd. Photographing optical lens system, image capturing unit and electronic device

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Publication number Priority date Publication date Assignee Title
US9146389B2 (en) 2013-01-11 2015-09-29 Hanwha Techwin Co., Ltd. Zoom lens system
CN107728299A (zh) * 2013-04-30 2018-02-23 扬明光学股份有限公司 变焦镜头
US11353685B2 (en) 2013-10-14 2022-06-07 Samsung Electro-Mechanics Co., Ltd. Lens module
US11774719B2 (en) 2013-10-14 2023-10-03 Samsung Electro-Mechanics Co., Ltd. Lens module
US10241300B2 (en) 2013-10-14 2019-03-26 Samsung Electro-Mechanics Co., Ltd. Lens module
US10365456B2 (en) 2013-10-14 2019-07-30 Samsung Electro-Mechanics Co., Ltd. Lens module
US10018805B2 (en) 2013-10-14 2018-07-10 Samsung Electro-Mechanics Co., Ltd. Lens module
US11774717B2 (en) 2013-10-14 2023-10-03 Samsung Electro-Mechanics Co., Ltd. Lens module
US11143846B2 (en) 2013-10-14 2021-10-12 Samsung Electro-Mechanics Co., Ltd. Lens module
CN104570280A (zh) * 2013-10-14 2015-04-29 三星电机株式会社 镜头模块
US12007536B2 (en) 2015-08-11 2024-06-11 Largan Precision Co., Ltd. Photographing optical lens system, image capturing unit and electronic device
US11668909B2 (en) 2015-08-11 2023-06-06 Largan Precision Co., Ltd. Photographing optical lens system, image capturing unit and electronic device
CN110346895A (zh) * 2018-04-02 2019-10-18 中强光电股份有限公司 定焦镜头
CN110346895B (zh) * 2018-04-02 2021-07-23 中强光电股份有限公司 定焦镜头
CN110328445A (zh) * 2019-07-12 2019-10-15 卡门哈斯激光科技（苏州）有限公司 一种近红外单色物镜
CN110328445B (zh) * 2019-07-12 2020-12-22 卡门哈斯激光科技（苏州）有限公司 一种近红外单色物镜
CN112269241A (zh) * 2020-11-20 2021-01-26 四川长虹电器股份有限公司 一种适用于dlp光固化3d打印的投影镜头

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