WO2010071077A1 - Lentille d'imagerie - Google Patents

Lentille d'imagerie Download PDF

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Publication number
WO2010071077A1
WO2010071077A1 PCT/JP2009/070708 JP2009070708W WO2010071077A1 WO 2010071077 A1 WO2010071077 A1 WO 2010071077A1 JP 2009070708 W JP2009070708 W JP 2009070708W WO 2010071077 A1 WO2010071077 A1 WO 2010071077A1
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WO
WIPO (PCT)
Prior art keywords
lens
imaging lens
refractive power
object side
imaging
Prior art date
Application number
PCT/JP2009/070708
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English (en)
Japanese (ja)
Inventor
隆広 三觜
来 未
Original Assignee
株式会社タムロン
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Filing date
Publication date
Application filed by 株式会社タムロン filed Critical 株式会社タムロン
Publication of WO2010071077A1 publication Critical patent/WO2010071077A1/fr

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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
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • 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
    • G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
    • 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
    • G02B9/58—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only arranged - + + -

Definitions

  • the present invention relates to a small and lightweight imaging lens suitable for an imaging apparatus provided with a solid-state imaging device such as a CCD (Charged Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).
  • a solid-state imaging device such as a CCD (Charged Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).
  • imaging devices on-vehicle cameras
  • in-vehicle cameras use a high dynamic range camera and incorporate a technique for recognizing people and objects in a captured image.
  • a vehicle-mounted camera is required to have a highly reliable lens capable of obtaining a bright image with a small size and a simple configuration.
  • In-vehicle cameras are required to have a bright lens that allows a lot of light to enter the periphery so that the person or object captured can be accurately recognized even when the image is recognized, even at the periphery of the screen. This requirement is particularly strong in order to be able to withstand night use.
  • Patent Document 1 since the imaging lens described in Patent Document 1 has an exit pupil position close to the image plane, the incident angle of light on the image plane increases, and when a solid-state imaging device such as a CCD or CMOS is used, the peripheral light amount decreases. There is a problem of inviting. Although there is a simple configuration, there is also a problem that correction of astigmatism is insufficient.
  • the present invention eliminates the problems caused by the prior art described above, and suppresses the generation of ghosts, prevents the decrease in the amount of peripheral light, and can satisfactorily correct various aberrations occurring in each lens.
  • An object is to provide a high-performance imaging lens.
  • an imaging lens according to the invention of claim 1 is arranged in order from the object side, and has a first lens having negative refractive power with a concave surface facing the object side.
  • an aperture stop is disposed between the first lens and the second lens, and the third lens and the fourth lens are joined.
  • the concave surface is formed on the most object side surface of the optical system, and the convex surface is formed on the most image side surface, thereby causing light reflected on the image side at the most object side surface.
  • the ghost generated between the most image side surface and the image sensor can be effectively suppressed.
  • an aperture stop is disposed between the first lens and the second lens, the amount of light at the periphery of the optical system increases, and a bright image can be obtained up to the periphery.
  • the third lens and the fourth lens it is possible to satisfactorily correct various aberrations generated in each lens.
  • An imaging lens according to a second aspect of the invention is characterized in that, in the first aspect of the invention, the following conditional expression is satisfied.
  • EXP is the distance from the exit pupil position to the image plane in the imaging lens
  • L is the distance from the first surface (most object side surface) to the image plane
  • f is the focal length of the imaging lens.
  • the second aspect of the present invention it is possible to define a good exit pupil position, and it is possible to prevent a decrease in the amount of peripheral light that occurs when the exit pupil position is too close to the image plane.
  • An imaging lens according to a third aspect of the invention is characterized in that, in the first or second aspect of the invention, the following conditional expression is satisfied. (2) -0.4 ⁇ (L / f) / R 1 ⁇ -0.2 Where L is the distance from the first surface (the most object side surface) to the image plane in the imaging lens, f is the focal length of the imaging lens, and R 1 is the radius of curvature of the first surface (the most object side surface) in the imaging lens. Indicates.
  • the third aspect of the present invention it is possible to more effectively suppress a ghost generated due to light reflected to the image side on the most object side surface of the optical system.
  • astigmatism can be effectively corrected.
  • the present invention it is possible to effectively suppress the ghost generated due to the light reflected to the image side on the most object side surface of the optical system and the ghost generated between the most image side surface and the image sensor.
  • FIG. 1 is a diagram for explaining the exit pupil position of the imaging lens according to the embodiment of the present invention.
  • FIG. 2 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the first example.
  • FIG. 4 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the second example.
  • FIG. 1 is a diagram for explaining the exit pupil position of the imaging lens according to the embodiment of the present invention.
  • FIG. 2 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the first example.
  • FIG. 3 is a diagram of various aberrations at the d-line ( ⁇
  • FIG. 6 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the third example.
  • An imaging lens includes, in order from the object side, a first lens having a negative refractive power with a concave surface facing the object side, a second lens having a positive refractive power, A third lens having a positive refractive power; a fourth lens having a negative refractive power; and a fifth lens having a positive refractive power with a convex surface facing the image side.
  • the imaging lens according to this embodiment is used for a digital video camera.
  • the light receiving surface of an image sensor mounted on a digital video camera has a high light reflectivity of about several tens of percent, so that the reflected light causes a ghost. Therefore, special consideration is required for the configuration of the imaging lens in order to suppress the occurrence of such a ghost.
  • the convex surface is formed on the image side surface of the fifth lens corresponding to the final surface of the imaging lens, so that the reflection on the imaging element is reflected again on the final surface.
  • Light originating from light can be directed away from the optical axis, and the luminance of ghost light can be reduced.
  • a concave surface on the object side surface of the first lens it is possible to reduce ghosts caused by light reflected from the outermost object side surface of the imaging lens toward the image side.
  • the aperture stop is disposed between the first lens and the second lens, the amount of light at the periphery of the optical system increases, and a bright image is obtained up to the periphery. It is done. Further, by joining the third lens and the fourth lens, it is possible to satisfactorily correct various aberrations generated in each lens.
  • digital video cameras especially in-vehicle cameras, may be used at night, so when recognizing images, even if you are at the periphery of the screen, A bright lens that can receive a lot of light is required. That is, a lens that does not cause a decrease in the amount of peripheral light is required. In order to suppress a decrease in the amount of peripheral light, it is necessary to optimize the exit pupil position.
  • FIG. 1 is a diagram for explaining an exit pupil position of an imaging lens according to an embodiment of the present invention.
  • the exit pupil is located at the intersection of the principal ray (the central ray of the oblique ray bundle) of the outermost luminous flux from the outermost image side surface (final surface) of the imaging lens and the optical axis.
  • the decrease in the amount of peripheral light occurs when the exit pupil position is too close to the image plane. In order to suppress the decrease in the peripheral light amount, it is necessary to appropriately set the distance from the image plane to the exit pupil position.
  • EXP is the distance from the exit pupil position of the imaging lens to the image plane
  • L is the distance from the first surface (most object side surface) to the image plane of the imaging lens
  • the focal length of the imaging lens is f, it is preferable that the following conditional expression is satisfied. (1) EXP / (L / f)> 6.0
  • Conditional expression (1) is an expression for defining an appropriate exit pupil position. By satisfying this conditional expression (1), it is possible to prevent a decrease in the amount of peripheral light.
  • the distance from the first surface (the most object side surface) to the image plane in the imaging lens is L
  • the focal length of the imaging lens is f
  • the first surface (when the radius of curvature of the most object side surface) and R 1 it is preferable to satisfy the following condition. (2) -0.4 ⁇ (L / f) / R 1 ⁇ -0.2
  • Conditional expression (2) is an expression that defines the curvature of the first surface (most object side surface) of the imaging lens.
  • conditional expression (2) when the upper limit is exceeded in the conditional expression (2), the curvature of the most object side surface of the imaging lens becomes large and becomes a shape close to a plane.
  • the light reflected by the light-receiving surface of the image sensor is re-reflected even on the most object side of the imaging lens, but when the re-reflected surface is close to a flat surface, the re-reflected light follows an optical path close to the incident light, thus forming an image.
  • a ghost image with high brightness is formed near the state.
  • the lower limit of conditional expression (1) if the lower limit of conditional expression (1) is not reached, it will be difficult to correct astigmatism, and image deterioration will be noticeable at the periphery.
  • the imaging lens according to this embodiment has the above-described characteristics, so that the optical system can be compacted between the most image side surface of the imaging lens and the imaging element without impairing the compactness of the optical system. It is possible to suppress the ghost generated and the ghost generated due to the light reflected to the image side on the most object side surface of the imaging lens. In addition, the peripheral light amount can be prevented from being reduced, and various aberrations generated in each lens can be corrected well.
  • FIG. 2 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the first example.
  • This imaging lens is a single focus lens, and in order from an object side (not shown), a first lens L 11 having a negative refractive power with a concave surface directed toward the object side, and a second lens L 12 having a positive refractive power.
  • a third lens L 13 having a positive refractive power, a fourth lens L 14 having a negative refractive power, a fifth lens L 15 having a positive refractive power with a convex surface facing the image plane IMG, Are arranged and configured.
  • the object side surface of the second lens L 12, the aperture stop STOP is provided.
  • the third lens L 13 and the fourth lens L 14 are cemented.
  • a light receiving surface of an image sensor such as a CCD or a CMOS is disposed on the image plane IMG.
  • an optical element such as a cover glass or a filter can be disposed between the fifth lens L 15 and the image plane IMG.
  • Focal length (f) of entire imaging lens system 7.0
  • F number 2.0
  • Half angle of view ( ⁇ ) 24.2 °
  • Object distance (distance from the first surface of the imaging lens to the object) ⁇
  • Distance from the exit pupil position to the image plane in the imaging lens (EXP) 13.1
  • Distance from first surface (most object side surface) to image surface in imaging lens (L) 14.6
  • Radius of curvature (R 1 ) of the first surface of the imaging lens -7.000
  • Maximum image height 3.0
  • FIG. 4 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the second example.
  • This imaging lens is a single focus lens, and in order from an object side (not shown), a first lens L 21 having a negative refractive power with a concave surface directed toward the object side, and a second lens L 22 having a positive refractive power.
  • a third lens L 23 having a positive refractive power, a fourth lens L 24 having a negative refractive power, a fifth lens L 25 having a positive refractive power with a convex surface facing the image plane IMG, Are arranged and configured.
  • the object side surface of the second lens L 22, the aperture stop STOP is provided.
  • the third lens L 23 and the fourth lens L 24 are cemented. Note that a light receiving surface of an image sensor such as a CCD or a CMOS is disposed on the image plane IMG. Further, if necessary, an optical element such as a cover glass or a filter can be disposed between the fifth lens L 25 and the image plane IMG.
  • Focal length (f) of entire imaging lens system 7.0
  • F number 2.0
  • Half angle of view ( ⁇ ) 24.2 °
  • Object distance (distance from the first surface of the imaging lens to the object) ⁇
  • Distance from the exit pupil position to the image plane in the imaging lens (EXP) 12.6
  • Distance from first surface (most object side surface) to image surface in imaging lens (L) 14.0
  • FIG. 6 is a cross-sectional view along the optical axis showing the configuration of the imaging lens according to the third example.
  • This imaging lens is a single focus lens, and in order from an object side (not shown), a first lens L 31 having a negative refractive power with a concave surface directed toward the object side, and a second lens L 32 having a positive refractive power.
  • a third lens L 33 having a positive refractive power, a fourth lens L 34 having a negative refractive power, a fifth lens L 35 having a positive refractive power with a convex surface facing the image plane IMG, Are arranged and configured.
  • An aperture stop STOP is provided on the side of the image plane IMG of the first lens L 31 .
  • the third lens L 33 and the fourth lens L 34 are cemented. Note that a light receiving surface of an image sensor such as a CCD or a CMOS is disposed on the image plane IMG. Further, if necessary, an optical element such as a cover glass or a filter can be disposed between the fifth lens L 35 and the image plane IMG.
  • Focal length (f) of entire imaging lens system 7.0
  • F number 2.0
  • Half angle of view ( ⁇ ) 24.2 °
  • Object distance (distance from the first surface of the imaging lens to the object) ⁇
  • Distance from the exit pupil position to the image plane in the imaging lens (EXP) 13.8
  • Distance from first surface (most object side surface) to image surface in imaging lens (L) 14.6
  • Curvature radius (R 1 ) of the first surface of the imaging lens -6.520
  • Maximum image height 3.0
  • r 1 , r 2 are the curvature radii of the lenses and the like
  • d 1 , d 2 are the thicknesses of the lenses or their surface spacings
  • the imaging lens of each of the above embodiments by satisfying the conditional expression, it occurs between the most image side surface of the imaging lens and the imaging element without impairing the compactness of the optical system. And the ghost generated due to the light reflected to the image side on the most object side surface of the imaging lens can be suppressed. In addition, the peripheral light amount can be prevented from being reduced, and various aberrations generated in each lens can be corrected well.
  • the imaging lens of the present invention is useful for a digital video camera equipped with a solid-state imaging device, and particularly, it is required to accurately recognize a person or an object captured even at the periphery of the screen. It is most suitable for in-vehicle cameras.

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

Abstract

La présente invention concerne une lentille d'imagerie qui est constituée, dans l'ordre à partir du côté de l'objet, d'une première lentille (L11) présentant une puissance réfractive négative et possédant une face concave faisant face à l'objet, d'une deuxième lentille (L12) présentant une puissance réfractive positive, d'une troisième lentille (L13) présentant une puissance réfractive positive, d'une quatrième lentille (L14) présentant une puissance réfractive négative et d'une cinquième lentille (L15) présentant une puissance réfractive positive et possédant une face convexe faisant face au plan de l'image (IMG). Un diaphragme d'ouverture (STOP) est disposé entre la première lentille (L11) et la deuxième lentille (L12). En outre, la troisième lentille (L13) et la quatrième lentille (L14) sont jointes l'une à l'autre. Selon une condition préétablie, les distorsions diverses générées par chaque lentille peuvent être corrigées de façon satisfaisante sans perte de la compacité du système optique, tout en supprimant la génération de fantômes et en évitant une réduction de la quantité de lumière périphérique.
PCT/JP2009/070708 2008-12-19 2009-12-10 Lentille d'imagerie WO2010071077A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-324158 2008-12-19
JP2008324158A JP2010145828A (ja) 2008-12-19 2008-12-19 撮像レンズ

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WO2010071077A1 true WO2010071077A1 (fr) 2010-06-24

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104101987A (zh) * 2013-04-08 2014-10-15 大立光电股份有限公司 取像系统镜片组
US8891182B2 (en) 2012-07-25 2014-11-18 Samsung Techwin Co., Ltd. Wide angle lens and photographing apparatus including the same
CN108693626A (zh) * 2017-04-05 2018-10-23 深圳鼎界科技有限公司 透射式大数值孔径消色差近眼显示光学镜头及智能眼镜
TWI663419B (zh) * 2016-05-16 2019-06-21 大陸商信泰光學（深圳）有限公司 成像鏡頭（十三）
CN110196496A (zh) * 2019-07-02 2019-09-03 深圳珑璟光电技术有限公司 一种可调节焦距的近眼显示设备
TWI685690B (zh) * 2018-03-14 2020-02-21 先進光電科技股份有限公司 光學成像系統（一）
TWI685689B (zh) * 2018-03-14 2020-02-21 先進光電科技股份有限公司 光學成像系統（二）

Families Citing this family (3)

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WO2016062230A1 (fr) * 2014-10-20 2016-04-28 宁波舜宇车载光学技术有限公司 Objectif optique
TWI622798B (zh) * 2017-08-01 2018-05-01 大立光電股份有限公司 光學影像擷取系統、取像裝置及電子裝置
JPWO2020262553A1 (fr) 2019-06-26 2020-12-30

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JP2006113109A (ja) * 2004-10-12 2006-04-27 Nidec Copal Corp ズームレンズ
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JPH03288113A (ja) * 1990-04-05 1991-12-18 Olympus Optical Co Ltd ズームレンズ
JP2000292692A (ja) * 1999-02-01 2000-10-20 Olympus Optical Co Ltd 撮影光学系
JP2006113109A (ja) * 2004-10-12 2006-04-27 Nidec Copal Corp ズームレンズ
JP2006163338A (ja) * 2004-12-08 2006-06-22 Ind Technol Res Inst ズームレンズ

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8891182B2 (en) 2012-07-25 2014-11-18 Samsung Techwin Co., Ltd. Wide angle lens and photographing apparatus including the same
CN104101987A (zh) * 2013-04-08 2014-10-15 大立光电股份有限公司 取像系统镜片组
TWI663419B (zh) * 2016-05-16 2019-06-21 大陸商信泰光學（深圳）有限公司 成像鏡頭（十三）
CN108693626A (zh) * 2017-04-05 2018-10-23 深圳鼎界科技有限公司 透射式大数值孔径消色差近眼显示光学镜头及智能眼镜
TWI685690B (zh) * 2018-03-14 2020-02-21 先進光電科技股份有限公司 光學成像系統（一）
TWI685689B (zh) * 2018-03-14 2020-02-21 先進光電科技股份有限公司 光學成像系統（二）
US10816757B2 (en) 2018-03-14 2020-10-27 Ability Opto-Electronics Technology Co., Ltd. Optical image capturing system
US10877249B2 (en) 2018-03-14 2020-12-29 Ability Opto-Electronics Technology Co., Ltd. Optical image capturing system
CN110196496A (zh) * 2019-07-02 2019-09-03 深圳珑璟光电技术有限公司 一种可调节焦距的近眼显示设备

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