WO2019235498A1 - 広角光学系及びそれを有する撮像装置 - Google Patents

広角光学系及びそれを有する撮像装置 Download PDF

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Publication number
WO2019235498A1
WO2019235498A1 PCT/JP2019/022240 JP2019022240W WO2019235498A1 WO 2019235498 A1 WO2019235498 A1 WO 2019235498A1 JP 2019022240 W JP2019022240 W JP 2019022240W WO 2019235498 A1 WO2019235498 A1 WO 2019235498A1
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Prior art keywords
lens
wide
optical system
refractive power
angle optical
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Ceased
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PCT/JP2019/022240
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English (en)
French (fr)
Japanese (ja)
Inventor
卓也 大津
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Nissei Technology Corp
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Nissei Technology Corp
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Priority to JP2020523131A priority Critical patent/JP7286893B2/ja
Publication of WO2019235498A1 publication Critical patent/WO2019235498A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Definitions

  • the present invention relates to a wide-angle optical system having an angle of view exceeding 180 degrees and an imaging apparatus having the same.
  • JP 2008-134494 A Japanese Patent No. 2010-256627
  • an advanced driving assistance system for enhancing preventive safety of an automobile such as an automatic brake.
  • Cameras for Driving Assistant System are rapidly spreading.
  • cameras for recording moving images such as drive recorders have become widespread.
  • cameras for security applications are widely installed in public institutions and roads. These cameras are required to have high image quality and high imaging performance over the entire imaging range in order to accurately capture people and objects over a wide range.
  • the present invention aims to solve the above conventional problems and achieve the following objects. That is, the present invention realizes high image quality with high image quality and high imaging performance in the entire imaging range, and eliminates focal position variation and wide-range use wavelength in a wide range of environmental temperatures (extremely high and extremely low temperatures) at which the camera operates.
  • An object of the present invention is to provide a wide-angle optical system and an imaging device that suppress the occurrence of various aberrations.
  • the wide-angle optical system according to claim 1 is a wide-angle optical system having an angle of view exceeding 180 degrees, and includes a front group, an aperture stop, and a rear group in order from the object side.
  • a first lens having a negative refractive power In order from the object side, a first lens having a negative refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, and a fourth lens having a positive refractive power
  • the group includes, in order from the object side, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, a seventh lens having a negative refractive power, and an eighth lens having a positive refractive power.
  • the wide-angle optical system according to claim 2 preferably satisfies the following conditional expression in the wide-angle optical system according to claim 1. -0.05 ⁇ f / f6-f / f7 ⁇ 0.05 (1) here, f is the focal length of the entire wide-angle optical system, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, It is.
  • the wide angle optical system according to claim 3 preferably satisfies the following conditional expression in the wide angle optical system according to claim 1 or claim 2. -0.05 ⁇ f / f6-f / f7 ⁇ 0 (2)
  • the wide-angle optical system according to claim 4 is the wide-angle optical system according to any one of claims 1 to 3, It is preferable that the following conditional expression is satisfied. 0.3 ⁇ r12 / r13 ⁇ 1.5 (3) here, r12 is the radius of curvature of the image side surface of the sixth lens; r13 is the radius of curvature of the object side surface of the seventh lens.
  • a wide-angle optical system according to a fifth aspect is the wide-angle optical system according to any one of the first to fourth aspects, wherein the fifth lens, the sixth lens, and the seventh lens are included in the rear group.
  • the material of any two lenses is preferably optical glass, and the material of one lens is preferably plastic.
  • the wide-angle optical system according to claim 6 is the wide-angle optical system according to any one of claims 1 to 5, wherein the seventh lens is preferably a biconcave lens.
  • An imaging apparatus includes the wide-angle optical system according to any one of the first to sixth aspects and a solid-state imaging element.
  • the present invention it is possible to achieve both high image quality and high imaging performance over the entire field of view of a wide imaging area, and to eliminate fluctuations in the focal position with respect to temperature changes in the usage environment and to generate various aberrations over the entire usage wavelength There is an effect that can be suppressed.
  • FIG. 4 is a diagram illustrating (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 1. It is sectional drawing which follows the optical axis which shows the optical structure of the wide angle optical system concerning Example 2 of this invention.
  • FIG. 10 is a diagram illustrating (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 2.
  • FIG. 10 is a diagram illustrating (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion aberration (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 3. It is sectional drawing which follows the optical axis which shows the optical structure of the wide angle optical system concerning Example 4 of this invention.
  • FIG. 10 is a diagram illustrating (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion aberration (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 4.
  • FIG. 10 is a diagram illustrating (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion aberration (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 5. It is sectional drawing which follows the optical axis which shows the optical structure of the wide angle optical system concerning Example 6 of this invention.
  • SA spherical aberration
  • AS astigmatism
  • DT distortion aberration
  • FIG. 1 is a cross-sectional view along an optical axis showing an example of an optical configuration of a wide-angle optical system according to an embodiment of the present invention.
  • the optical configuration of FIG. 1 corresponds to the optical configuration of the first embodiment.
  • the wide-angle optical system of the present invention includes a front group, an aperture stop S, and a rear group arranged in order from the object side, and the front lens group includes a first lens L1 having negative refractive power in order from the object side.
  • the rear lens group has, in order from the object side, a fifth lens L5 having a positive refractive power, a sixth lens L6 having a negative refractive power, and a negative refractive power. And a seventh lens L7 having a positive refractive power and an eighth lens L8 having a positive refractive power.
  • CG represents a cover glass
  • I represents an imaging surface of an imaging element in the optical configuration cross-sectional views.
  • the rear lens group of the present invention has a four-lens configuration including two negative lenses disposed adjacent to the most object-side positive lens L5. It is possible to minimize the fluctuation.
  • the fifth lens L5 and the sixth lens L6 are both glass and cemented lenses, and at least the seventh lens is an aspheric plastic lens.
  • the fifth lens L5 and the seventh lens L7 are glass lenses
  • the sixth lens L6 is a plastic lens
  • the fifth lens L5 and the sixth lens L6. May be unbonded.
  • An imaging device such as a CCD is disposed on the imaging surface I of the wide-angle optical system of the present invention.
  • Various optical elements such as an infrared cut filter may be arranged in the space between the eighth lens L8 and the cover glass CG.
  • the wide-angle optical system according to the present embodiment is preferably configured as a three-dimensional projection type optical system as a projection type in order to ensure the amount of information (visibility) in the periphery of a wide field of view.
  • the wide-angle optical system according to the present embodiment realizes a wide-angle optical system with a field angle of more than 180 degrees and a stereoscopic projection system by the first lens L1 to the fourth lens L4 constituting the front group, and constitutes the rear group.
  • the fifth lens L5 to the eighth lens L8 enable effective correction of various aberrations generated in these wide-angle stereoscopic projection images.
  • the second lens L2 has a concave shape on the object side in the vicinity of the optical axis, so that the optical axis from the image-side surface to the image plane of the eighth lens L8 is increased. (Back focus) becomes longer, and a space for installing various optical elements such as an infrared cut filter can be secured between the eighth lens L8 and the cover glass CG.
  • the wide-angle optical system according to the present embodiment satisfies the following conditional expression. -0.05 ⁇ f / f6-f / f7 ⁇ 0.05 (1) here, f is the focal length of the entire wide-angle optical system, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, It is.
  • Conditional expression (1) is a conditional expression for enabling fluctuation removal of the focal position even in a wide range of usage environments from extremely low temperatures to extremely high temperatures.
  • the wide-angle optical system of the present embodiment satisfies the following conditional expression. 0.3 ⁇ r12 / r13 ⁇ 1.5 (2) here, r12 is the radius of curvature of the image side surface of the sixth lens; r13 is the radius of curvature of the object side surface of the seventh lens.
  • Conditional expression (2) is for optimizing the radius of curvature of the image side surface of the sixth lens L6 and the radius of curvature of the object side surface of the seventh lens L7 to satisfactorily correct spherical aberration occurring in the optical system. It is a conditional expression.
  • the imaging apparatus of the present invention includes the imaging optical system of the present invention and a solid-state imaging device such as a CCD or a CMOS.
  • f focal length of the entire imaging optical system
  • FNO F number FOV (2 ⁇ ): angle of view
  • r paraxial radius of curvature
  • d lens thickness or air spacing on the optical axis
  • nd refractive index ⁇ d of lens material with respect to d-line : Abbe number of lens material
  • the surface described with “*” after each surface number is an aspheric surface.
  • the aspherical shape is expressed by the following formula (I) where z is the optical axis direction, y is the direction orthogonal to the optical axis, K is the conic coefficient, and A4, A6, A8, A10. ).
  • z (y 2 / r) / [1+ ⁇ 1- (1 + K) (y / r) 2 ⁇ 1/2] + A4y 4 + A6y 6 + A8y 8 + A10y 10 ⁇
  • E represents a power of 10, for example, 2.3 ⁇ 10 ⁇ 2 is represented as 2.3E-002.
  • the symbols of these specification values are also common in the numerical data of the examples described later.
  • FIG. 1 is a cross-sectional view along the optical axis showing the optical configuration of the wide-angle optical system according to the first embodiment.
  • FIG. 2 shows (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion aberration (DT) at the time of focusing on an object point at infinity of the wide-angle optical system according to Example 1.
  • SA spherical aberration
  • AS astigmatism
  • DT distortion aberration
  • this wide-angle optical system includes, in order from the object side, a meniscus first lens L1 having a negative refractive power with a convex surface facing the object side, and a negative having a biconcave shape near the optical axis.
  • a sixth lens L6 having negative refractive power, a seventh lens L7 having biconcave shape and negative refractive power, and a biconvex seventh lens L7 having positive refractive power. Yes.
  • both the fifth lens L5 and the sixth lens L6 are made of glass and are cemented lenses, and at least the seventh lens is an aspheric plastic lens.
  • the fifth lens L5 and the sixth lens L6 are glass cemented lenses, and the seventh lens is a plastic lens. Can be prevented.
  • FIG. 3 is a cross-sectional view along the optical axis showing the optical configuration of the wide-angle optical system according to the second embodiment.
  • FIG. 4 shows (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion aberration (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 2.
  • SA spherical aberration
  • AS astigmatism
  • DT distortion aberration
  • the wide-angle optical system includes, in order from the object side, a meniscus first lens L1 having a negative refractive power with a convex surface facing the object side, and a negative biconcave shape in the vicinity of the optical axis.
  • a sixth lens L6 having negative refractive power, a seventh lens L7 having biconcave shape and negative refractive power, and a biconvex seventh lens L7 having positive refractive power. Yes.
  • the fifth lens L5 and the sixth lens L6 are both glass and cemented lenses, and at least the seventh lens is an aspheric plastic lens.
  • the fifth lens L5 and the sixth lens L6 are glass cemented lenses, and the seventh lens is a plastic lens. Can be prevented.
  • FIG. 5 is a cross-sectional view along the optical axis showing the optical configuration of the wide-angle optical system according to the third embodiment.
  • FIG. 6 shows (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion (DT) during focusing on an object point at infinity of the wide-angle optical system according to Example 3.
  • SA spherical aberration
  • AS astigmatism
  • DT distortion
  • the wide-angle optical system includes, in order from the object side, a meniscus first lens L1 having a negative refractive power with a convex surface facing the object side, and a negative biconcave shape near the optical axis.
  • a sixth lens L6 having negative refractive power, a seventh lens L7 having biconcave shape and negative refractive power, and a biconvex seventh lens L7 having positive refractive power. Yes.
  • both the fifth lens L5 and the sixth lens L6 are made of glass and are cemented lenses, and at least the seventh lens is an aspheric plastic lens.
  • the fifth lens L5 and the sixth lens L6 are glass cemented lenses, and the seventh lens is a plastic lens. Can be prevented.
  • FIG. 7 is a cross-sectional view along the optical axis showing the optical configuration of the wide-angle optical system according to the fourth embodiment.
  • FIG. 8 shows (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion aberration (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 4.
  • SA spherical aberration
  • AS astigmatism
  • DT distortion aberration
  • the wide-angle optical system includes, in order from the object side, a meniscus first lens L1 having a negative refractive power with a convex surface facing the object side, and a negative having a biconcave shape near the optical axis.
  • a sixth lens L6 having negative refractive power, a seventh lens L7 having biconcave shape and negative refractive power, and a biconvex seventh lens L7 having positive refractive power. Yes.
  • the fifth lens L5 and the seventh lens L7 are glass lenses
  • the sixth lens L6 is a plastic lens
  • the fifth lens L5 and the sixth lens L6 are not joined.
  • the fifth lens L5 and the seventh lens L7 are glass lenses, and the sixth lens is a plastic lens, so that removal of fluctuations in the focal position with respect to temperature changes in the use environment can be minimized. I can do it.
  • FIG. 9 is a cross-sectional view along the optical axis showing the optical configuration of the wide-angle optical system according to the fifth embodiment.
  • FIG. 10 shows (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 5.
  • SA spherical aberration
  • AS astigmatism
  • DT distortion
  • this wide-angle optical system includes, in order from the object side, a meniscus first lens L1 having a negative refractive power with a convex surface facing the object side, and a negative biconcave shape in the vicinity of the optical axis.
  • a sixth lens L6 having negative refractive power, a seventh lens L7 having biconcave shape and negative refractive power, and a biconvex seventh lens L7 having positive refractive power. Yes.
  • the fifth lens L5 and the sixth lens L6 are both glass and cemented lenses, and at least the seventh lens is an aspheric plastic lens.
  • the fifth lens L5 and the sixth lens L6 are glass cemented lenses, and the seventh lens is a plastic lens. Can be prevented.
  • FIG. 11 is a cross-sectional view along the optical axis showing the optical configuration of the wide-angle optical system according to Example 6.
  • FIG. 12 shows (a) spherical aberration (SA), (b) astigmatism (AS), and (c) distortion (DT) when focusing on an object point at infinity of the wide-angle optical system according to Example 6.
  • SA spherical aberration
  • AS astigmatism
  • DT distortion
  • the wide-angle optical system includes, in order from the object side, a meniscus first lens L1 having a negative refractive power with a convex surface facing the object side, and a negative having a biconcave shape near the optical axis.
  • a sixth lens L6 having negative refractive power, a seventh lens L7 having biconcave shape and negative refractive power, and a biconvex seventh lens L7 having positive refractive power. Yes.
  • the fifth lens L5 and the sixth lens L6 are both glass and cemented lenses, and at least the seventh lens is an aspheric plastic lens.
  • the fifth lens L5 and the sixth lens L6 are glass cemented lenses, and the seventh lens is a plastic lens. Can be prevented.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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PCT/JP2019/022240 2018-06-04 2019-06-04 広角光学系及びそれを有する撮像装置 Ceased WO2019235498A1 (ja)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021127884A1 (zh) * 2019-12-23 2021-07-01 诚瑞光学(常州)股份有限公司 摄像光学镜头
WO2021127871A1 (zh) * 2019-12-23 2021-07-01 诚瑞光学(常州)股份有限公司 摄像光学镜头
CN114967051A (zh) * 2022-04-11 2022-08-30 青岛理工大学 一种人脸识别镜头
CN115185061A (zh) * 2021-04-07 2022-10-14 大立光电股份有限公司 光学影像撷取镜片组、取像装置及电子装置
TWI803729B (zh) * 2019-12-20 2023-06-01 中國大陸商玉晶光電（廈門）有限公司 光學成像鏡頭
JPWO2023127560A1 (https=) * 2021-12-28 2023-07-06
TWI917183B (zh) 2019-12-20 2026-03-01 大陸商玉晶光電（廈門）有限公司 光學成像鏡頭

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JP2004102162A (ja) * 2002-09-12 2004-04-02 Minolta Co Ltd 超広角レンズ
KR20100124641A (ko) * 2009-05-19 2010-11-29 주식회사 나노포토닉스 어안 렌즈
CN106094172A (zh) * 2016-08-25 2016-11-09 厦门爱劳德光电有限公司 一种500万像素鱼眼镜头
CN205920265U (zh) * 2016-08-25 2017-02-01 厦门爱劳德光电有限公司 一种500万像素鱼眼镜头

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004102162A (ja) * 2002-09-12 2004-04-02 Minolta Co Ltd 超広角レンズ
KR20100124641A (ko) * 2009-05-19 2010-11-29 주식회사 나노포토닉스 어안 렌즈
CN106094172A (zh) * 2016-08-25 2016-11-09 厦门爱劳德光电有限公司 一种500万像素鱼眼镜头
CN205920265U (zh) * 2016-08-25 2017-02-01 厦门爱劳德光电有限公司 一种500万像素鱼眼镜头

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI803729B (zh) * 2019-12-20 2023-06-01 中國大陸商玉晶光電（廈門）有限公司 光學成像鏡頭
TWI874980B (zh) * 2019-12-20 2025-03-01 大陸商玉晶光電（廈門）有限公司 光學成像鏡頭
TWI917183B (zh) 2019-12-20 2026-03-01 大陸商玉晶光電（廈門）有限公司 光學成像鏡頭
WO2021127884A1 (zh) * 2019-12-23 2021-07-01 诚瑞光学(常州)股份有限公司 摄像光学镜头
WO2021127871A1 (zh) * 2019-12-23 2021-07-01 诚瑞光学(常州)股份有限公司 摄像光学镜头
CN115185061A (zh) * 2021-04-07 2022-10-14 大立光电股份有限公司 光学影像撷取镜片组、取像装置及电子装置
CN115185061B (zh) * 2021-04-07 2023-06-23 大立光电股份有限公司 光学影像撷取镜片组、取像装置及电子装置
JPWO2023127560A1 (https=) * 2021-12-28 2023-07-06
WO2023127560A1 (ja) * 2021-12-28 2023-07-06 株式会社ニコン 光学系、光学機器および光学系の製造方法
JP7715213B2 (ja) 2021-12-28 2025-07-30 株式会社ニコン 光学系、光学機器および光学系の製造方法
CN114967051A (zh) * 2022-04-11 2022-08-30 青岛理工大学 一种人脸识别镜头
CN114967051B (zh) * 2022-04-11 2023-11-10 青岛理工大学 一种人脸识别镜头

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