WO2016105074A1 - Système optique de lentilles - Google Patents

Système optique de lentilles Download PDF

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Publication number
WO2016105074A1
WO2016105074A1 PCT/KR2015/014082 KR2015014082W WO2016105074A1 WO 2016105074 A1 WO2016105074 A1 WO 2016105074A1 KR 2015014082 W KR2015014082 W KR 2015014082W WO 2016105074 A1 WO2016105074 A1 WO 2016105074A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical system
sensor
conditional expression
object side
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Application number
PCT/KR2015/014082
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English (en)
Korean (ko)
Inventor
조재훈
김세진
강선명
이영민
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(주)파트론
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Publication of WO2016105074A1 publication Critical patent/WO2016105074A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • 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
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms

Definitions

  • the present invention relates to a lens optical system, and more particularly to a lens optical system that can be mounted in the camera module for imaging.
  • the imaging camera module includes a lens optical system including at least one lens and an image sensor that receives light passing through the lens optical system and converts the light into an electrical signal.
  • a solid-state imaging device such as a charge coupled device (CCD) or a complementary metal oxide semiconductor image sensor (CMOS image sensor) is widely used.
  • camera modules are widely used in electronic devices such as smartphones, tablet computers, and laptop-top computers. Such electronic devices tend to be gradually miniaturized and thinned to improve user convenience and aesthetics. In addition, the conventional camera device also tends to develop in the form of miniaturization and thinning. Accordingly, camera modules mounted in such electronic devices have also been miniaturized and require a small thickness.
  • a recent camera module requires a lens having a wide angle of view so that more information can be captured with one shot.
  • the problem to be solved by the present invention is to provide a high-performance lens optical system that can be used in combination with a high resolution image sensor while being compact and wide field of view to solve the above problems.
  • the lens optical system of the present invention for solving the above problems is a first lens, a second lens, a third lens, and a fourth lens sequentially arranged from the object side to the sensor side between an object and a sensor in which the image of the object is formed.
  • the first lens has positive refractive power
  • the object side surface of the first lens is convex toward the object side
  • the second lens has negative refractive power
  • the object side surface of the second lens is at least near the optical axis
  • the third lens has positive refractive power
  • the fourth lens has negative refractive power
  • the sensor side of the fourth lens is concave toward the sensor side and has at least one inflection point.
  • f2 denotes a focal length of the second lens
  • f denotes a focal length of the lens optical system
  • the sensor side surface of the first lens may be convex toward the sensor side, and the sensor side surface of the second lens may be concave toward the sensor side.
  • the object side surface of the fourth lens may be convex toward the object side and have at least one inflection point near the optical axis.
  • the object-side surface of the second lens may be a plane within the effective diameter.
  • the object side surface of the second lens may be a plane.
  • all surfaces except the object side surface of the second lens may be aspherical.
  • the aperture may further include an aperture located between the object side surface of the first lens.
  • conditional expression may be further satisfied.
  • SL represents the distance on the optical axis between the aperture and the sensor
  • TTL represents the distance on the optical axis between the object-side surface of the first lens and the sensor.
  • conditional expression may be further satisfied.
  • conditional expression may be further satisfied.
  • V3 represents the Abbe number of the third lens
  • V4 represents the Abbe number of the fourth lens
  • conditional expression may be further satisfied.
  • conditional expression may be further satisfied.
  • TTL represents a distance on the optical axis between the object side surface of the first lens and the sensor
  • BFL represents a distance on the optical axis between the sensor side surface of the fourth lens and the sensor.
  • Lens optical system is a high-performance lens optical system that can be used in combination with a high resolution image sensor while being compact and wide angle of view.
  • Lens optical system has the advantage that the distance between the sensor side of the last lens and the sensor is relatively short, the overall length of the lens optical system is short, and as a result the camera module can be miniaturized.
  • One embodiment of the present invention has the advantage that the spherical aberration and the coma aberration are maintained at a predetermined level or less while the angle of view is wider than the focal length of the lens optical system.
  • 1 is a lens configuration of a lens optical system of a first embodiment according to an embodiment of the present invention.
  • FIG. 2 is a lens configuration of the lens optical system of the second embodiment according to an embodiment of the present invention.
  • FIG. 3 is a lens configuration diagram of the lens optical system of the third embodiment according to the embodiment of the present invention.
  • FIG. 4 is a lens configuration of the lens optical system of the fourth embodiment according to an embodiment of the present invention.
  • FIG. 5 sequentially shows spherical aberration, astigmatism, and distortion aberration of the lens optical system of the first embodiment shown in FIG.
  • FIG. 6 sequentially shows spherical aberration, astigmatism, and distortion aberration of the lens optical system of the second embodiment shown in FIG.
  • FIG. 7 sequentially shows spherical aberration, astigmatism, and distortion aberration of the lens optical system of the third embodiment shown in FIG.
  • FIG. 8 sequentially shows spherical aberration, astigmatism, and distortion aberration of the lens optical system of the fourth embodiment shown in FIG.
  • FIGS. 1 to 5 a lens optical system according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 to 5.
  • 1 to 4 are lens configuration diagrams of the lens optical system according to the first to fourth embodiments, respectively.
  • the lens optical system may include a first lens L1 and a second lens between an object corresponding to a subject of the lens optical system and a sensor IS in which an image of the object is formed.
  • L2 the third lens L3, and the fourth lens L4 are positioned.
  • the first to fourth lenses L1, L2, L3, and L4 are sequentially arranged from the object side to the sensor side.
  • Each lens has two sides facing each other.
  • the plane facing the object side corresponds to the plane of incidence, which is the plane where light enters the lens.
  • the surface facing the sensor side corresponds to an emission surface which is a surface from which light is emitted from the lens.
  • Sn1 the surface that is the object side and the incident surface of the n-th lens
  • Sn2 the surface that is the sensor side and the emission surface
  • the object side surface and the incident surface of the second lens (L2) is represented by S21
  • the sensor side surface and the exit surface is represented by S22
  • the object-side surface and the incident surface of the third lens L3 are represented by S31
  • the sensor-side surface and the exit surface are represented by S32
  • the object-side surface and the incident surface of the fourth lens L4 are represented by S41
  • the sensor-side surface and the exit surface are represented by S42.
  • the first lens L1 has a positive refractive power.
  • S11 is convex on the object side
  • S12 is convex on the sensor side.
  • S11 and S12 may both be formed as an aspherical surface.
  • the first lens L1 may be formed of a plastic material.
  • the second lens L2 has negative refractive power.
  • S21 is a plane at least near the optical axis, and S22 is concave toward the sensor side.
  • S21 may be planar not only near the optical axis but also within the effective diameter of the optical lens system.
  • S21 may be formed in a plane as a whole.
  • S22 may be formed as an aspherical surface.
  • the second lens L2 may be formed of a plastic material.
  • the third lens L3 has a positive refractive power.
  • the third lens L3 has a meniscus shape in which it is convex toward the sensor.
  • S31 is concave to the object side
  • S32 is convex to the sensor side.
  • S31 and S32 may both be formed as an aspherical surface.
  • the third lens L3 may be formed of a plastic material.
  • the fourth lens L4 has negative refractive power.
  • S41 is convex toward the object side near the optical axis
  • S42 is convex toward the sensor side near the optical axis.
  • S41 and S42 may both be formed as an aspherical surface.
  • S41 may include a portion that is convex toward the object side near the optical axis and becomes concave toward the peripheral portion of the lens near the optical axis.
  • S41 may include at least one inflection point.
  • S42 may include a portion that is concave toward the sensor near the optical axis and becomes convex toward the peripheral portion of the lens near the optical axis.
  • S42 may include at least one inflection point.
  • the lens optical system may include an aperture S.
  • the aperture S may be located on the object side of the first lens L1 or may be positioned over the first lens L1. In more detail, the aperture S may be positioned over the object side surface of the first lens L1. The aperture S may block a part of the light to adjust the amount of light irradiated into the lens optical system.
  • the lens optical system may include an optical filter OF.
  • the optical filter OF may be positioned between the fourth lens L4 and the sensor IS.
  • the optical filter OF may block light in a band other than visible light. Specifically, the optical filter OF may block light in the infrared band.
  • the sensor IS may be an image sensor that receives light passing through the lens and converts the light into an electrical signal.
  • the sensor IS is preferably positioned on the rear surface of the fourth lens L4 such that light passing through the first to fourth lenses L4 forms on the object side surface of the sensor.
  • the lens optical system of the embodiments of the present invention having the above configuration may satisfy the following conditional expression.
  • f2 denotes a focal length of the second lens L2 and f denotes a focal length of the lens optical system.
  • Conditional Expression 1 is a conditional expression for limiting the focal length of the second lens L2 with respect to the focal length of the entire lens optical system.
  • the focal length of the second lens L2 satisfies the above condition with respect to the focal length of the lens optical system, the angle of view of the lens optical system may be increased.
  • SL represents a distance on the optical axis between the aperture S and the sensor IS
  • TTL represents a distance on the optical axis between the object side surface of the first lens L1 and the sensor IS.
  • Conditional Expression 2 is a conditional expression for limiting the position of the aperture in the lens optical system.
  • the conditional expression 2 when the SL / TTL is smaller than the lower limit value 0.75, the aperture is positioned on the sensor side with respect to the first lens L1.
  • the SL / TTL is larger than the upper limit value 1.25 in Conditional Expression 2, the aperture is positioned on the object side with respect to the first lens L1.
  • the SL / TTL in order to position the diaphragm S over the object side surface of the first lens L1, the SL / TTL must satisfy the above range.
  • Conditional Expression 3 is a conditional expression that defines the angle of view in the lens optical system.
  • tan ( ⁇ ) / f is less than the lower limit value (1.0) in Conditional Expression 3, the angle of view is too small to implement an optical lens optical system.
  • tan ( ⁇ ) / f is greater than the upper limit (4.0) in Conditional Equation 3, the angle of view may be increased, so that a wide-angle lens optical system may be realized, but spherical aberration and coma aberration may be increased, thereby performing the performance of the lens optical system. Will fall.
  • V3 represents the Abbe number of the third lens L3
  • V4 represents the Abbe number of the fourth lens L4.
  • Conditional Expression 4 is a conditional expression for limiting the optical characteristics of the material forming the third lens (L3) and the fourth lens (L4).
  • (V3 + V4) / 2 in Conditional Expression 4 means an average of Abbe's numbers of the third lens L3 and the fourth lens L4.
  • a plastic resin material having an Abbe number of 50 or more may be used.
  • the third lens L3 and the fourth lens L4 may be made of Z-E48R having an Abbe number of 55.8559 or APEL-5514ML having an Abbe number of 56.0928.
  • the manufacturing cost can be lowered and the lens can be formed compared to the glass lens having similar characteristics. You can increase the range.
  • CRA represents the maximum value among the angles at which the chief ray is incident on the sensor.
  • Conditional Expression 5 is a conditional expression for defining the sensor incident angle of the chief ray.
  • TTL is the distance on the optical axis between the object side surface of the first lens (L1) and the sensor IS
  • the BFL is on the optical axis between the sensor side surface of the fourth lens (L4) and the sensor (IS). Indicates distance.
  • Conditional Expression 6 is a conditional expression for limiting the overall length of the lens optical system to a predetermined level or less.
  • the distance between the sensor side and the sensor side of the last lens tends to decrease.
  • the TTL / BFL is close to the upper limit (4.0) in the conditional expression 6. As the TTL / BFL increases in the lens optical system, the electric field may be shortened.
  • FIGS. 1 and 5 a first embodiment of the present invention will be described with reference to FIGS. 1 and 5.
  • the following is a table of optical data of the lens optical system of the first embodiment shown in FIG.
  • the following table shows the curvature radius (r), lens thickness and distance between lenses (d), refractive index (N d ), focal length (f), Abbe's number (V d ), and lens optics of each lens constituting the lens optical system. Data about focal length, Fno, TTL, and field of view.
  • * indicates that the lens surface is aspheric.
  • the distance unit of r, d and f is mm.
  • the aspherical surface of the lens surface of the lens optical system of the first embodiment shown in Fig. 1 satisfies the aspherical equation of the following equation.
  • z represents the distance from the vertex of the lens in the optical axis direction
  • y represents the distance in the direction perpendicular to the optical axis
  • R denotes the radius of curvature at the apex of the lens
  • K denotes the conic constant
  • a ⁇ 2> -A ⁇ 12> represents an aspherical surface coefficient, respectively.
  • the following is a table of aspherical coefficients of the aspherical surface of the lens surface of the lens optical system of the first embodiment shown in FIG.
  • the target values of the conditional expressions 1 to 6 of the lens optical system of the first embodiment correspond to the conditional expressions 1 to 6.
  • FIG. 5 sequentially shows spherical aberration, astigmatism, and distortion aberration of the lens optical system of the first embodiment shown in FIG.
  • the wavelengths used to measure spherical aberration are 435.8 nm, 486.1 nm, 546.1 nm 587.6 nm and 656.3 nm.
  • the wavelength measured to measure astigmatism and distortion is 546.1 nm.
  • the following is a table relating to optical data of the lens optical system of the second embodiment shown in FIG.
  • the following table shows the curvature radius (r), lens thickness and distance between lenses (d), refractive index (N d ), focal length (f), Abbe's number (V d ), and lens optics of each lens constituting the lens optical system. Data about focal length, Fno, TTL, and field of view.
  • * indicates that the lens surface is aspheric.
  • the distance unit of r, d and f is mm.
  • the aspherical surface of the lens surface of the lens optical system of the second embodiment shown in Fig. 2 satisfies the aspherical equation of the following equation.
  • z represents the distance from the vertex of the lens in the optical axis direction
  • y represents the distance in the direction perpendicular to the optical axis
  • R denotes the radius of curvature at the apex of the lens
  • K denotes the conic constant
  • a ⁇ 2> -A ⁇ 12> represents an aspherical surface coefficient, respectively.
  • the following is a table of aspherical surface coefficients of the aspherical surface among the lens surface of the lens optical system of the second embodiment shown in FIG.
  • the target values of the conditional expressions 1 to 6 of the lens optical system of the second embodiment correspond to the conditional expressions 1 to 6.
  • FIG. 6 sequentially shows spherical aberration, astigmatism, and distortion aberration of the lens optical system of the second embodiment shown in FIG.
  • the wavelengths used to measure spherical aberration are 435.8 nm, 486.1 nm, 546.1 nm 587.6 nm and 656.3 nm.
  • the wavelength measured to measure astigmatism and distortion is 546.1 nm.
  • the following table shows the curvature radius (r), lens thickness and distance between lenses (d), refractive index (N d ), focal length (f), Abbe's number (V d ), and lens optics of each lens constituting the lens optical system. Data about focal length, Fno, TTL, and field of view.
  • * indicates that the lens surface is aspheric.
  • the distance unit of r, d and f is mm.
  • the aspherical surface of the lens surface of the lens optical system of the third embodiment shown in Fig. 3 satisfies the aspherical equation of the following equation.
  • z represents the distance from the vertex of the lens in the optical axis direction
  • y represents the distance in the direction perpendicular to the optical axis
  • R denotes the radius of curvature at the apex of the lens
  • K denotes the conic constant
  • a ⁇ 2> -A ⁇ 12> represents an aspherical surface coefficient, respectively.
  • the following is a table of aspherical coefficients of the aspherical surface of the lens surface of the lens optical system of the third embodiment shown in FIG.
  • the target values of the conditional expressions 1 to 6 of the lens optical system of the third embodiment correspond to the conditional expressions 1 to 6.
  • FIG. 7 sequentially shows spherical aberration, astigmatism, and distortion aberration of the lens optical system of the third embodiment shown in FIG.
  • the wavelengths used to measure spherical aberration are 435.8 nm, 486.1 nm, 546.1 nm 587.6 nm and 656.3 nm.
  • the wavelength measured to measure astigmatism and distortion is 546.1 nm.
  • the following table shows the curvature radius (r), lens thickness and distance between lenses (d), refractive index (N d ), focal length (f), Abbe's number (V d ), and lens optics of each lens constituting the lens optical system. Data about focal length, Fno, TTL, and field of view.
  • * indicates that the lens surface is aspheric.
  • the distance unit of r, d and f is mm.
  • the aspherical surface of the lens surface of the lens optical system of the fourth embodiment shown in Fig. 4 satisfies the aspherical equation of the following equation.
  • z represents the distance from the vertex of the lens in the optical axis direction
  • y represents the distance in the direction perpendicular to the optical axis
  • R denotes the radius of curvature at the apex of the lens
  • K denotes the conic constant
  • a ⁇ 2> -A ⁇ 12> represents an aspherical surface coefficient, respectively.
  • the following is a table of aspherical surface coefficients of the aspherical surface among the lens surface of the lens optical system of the fourth embodiment shown in FIG.
  • the target values of the conditional expressions 1 to 6 of the lens optical system of the fourth embodiment correspond to the conditional expressions 1 to 6.
  • FIG. 8 sequentially illustrates spherical aberration, astigmatism, and distortion aberration of the lens optical system of the fourth embodiment shown in FIG.
  • the wavelengths used to measure spherical aberration are 435.8 nm, 486.1 nm, 546.1 nm 587.6 nm and 656.3 nm.
  • the wavelength measured to measure astigmatism and distortion is 546.1 nm.

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

Abstract

L'invention concerne un système optique de lentilles. Le système optique de lentilles de la présente invention comprend une première lentille, une deuxième lentille, une troisième lentille et une quatrième lentille aménagées séquentiellement depuis un côté objet vers un côté capteur, entre un objet et un capteur au niveau duquel une image de l'objet est mise au point. La première lentille comporte une puissance de réfraction positive, une surface côté objet de la première lentille étant convexe vers le côté objet ; la deuxième lentille comporte une puissance de réfraction négative, une surface côté objet de la deuxième lentille étant plate au moins à proximité d'un axe optique ; la troisième lentille comporte une puissance de réfraction positive et une forme de ménisque convexe vers le côté capteur ; la quatrième lentille comporte une puissance de réfraction négative, et une surface latérale de capteur de la quatrième lentille est concave vers le côté capteur, comporte au moins un point d'inflexion et satisfait l'expression conditionnelle suivante : 1,0 <|f2/f|< 3,0, f2 représentant la longueur focale de la deuxième lentille, et f représentant la longueur focale du système optique de lentilles.
PCT/KR2015/014082 2014-12-22 2015-12-22 Système optique de lentilles WO2016105074A1 (fr)

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KR1020140186430A KR101661922B1 (ko) 2014-12-22 2014-12-22 렌즈 광학계
KR10-2014-0186430 2014-12-22

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CN114252983A (zh) * 2021-12-27 2022-03-29 季华实验室 一种共口径中长波红外成像光学系统

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KR101956705B1 (ko) * 2017-08-21 2019-03-11 삼성전기주식회사 촬상 광학계
KR102159667B1 (ko) * 2018-11-27 2020-09-24 엘컴텍 주식회사 렌즈 광학계
CN110297306B (zh) * 2019-04-15 2021-06-11 玉晶光电(厦门)有限公司 光学成像镜头
KR20200127756A (ko) 2019-05-03 2020-11-11 삼성전자주식회사 광학 렌즈 시스템 및 그를 포함하는 전자 장치

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KR20110137627A (ko) * 2010-06-17 2011-12-23 삼성전기주식회사 촬상 광학계
KR20120106022A (ko) * 2011-03-17 2012-09-26 삼성테크윈 주식회사 렌즈계 및 이를 구비한 촬영 장치
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114252983A (zh) * 2021-12-27 2022-03-29 季华实验室 一种共口径中长波红外成像光学系统
CN114252983B (zh) * 2021-12-27 2023-06-02 季华实验室 一种共口径中长波红外成像光学系统

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