WO2022141315A1 - Système optique, dispositif photographique et plateforme mobile - Google Patents

Système optique, dispositif photographique et plateforme mobile Download PDF

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Publication number
WO2022141315A1
WO2022141315A1 PCT/CN2020/141840 CN2020141840W WO2022141315A1 WO 2022141315 A1 WO2022141315 A1 WO 2022141315A1 CN 2020141840 W CN2020141840 W CN 2020141840W WO 2022141315 A1 WO2022141315 A1 WO 2022141315A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical system
following expression
center point
image sensor
Prior art date
Application number
PCT/CN2020/141840
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English (en)
Chinese (zh)
Inventor
游旭
毛庆
Original Assignee
深圳市大疆创新科技有限公司
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 深圳市大疆创新科技有限公司 filed Critical 深圳市大疆创新科技有限公司
Priority to PCT/CN2020/141840 priority Critical patent/WO2022141315A1/fr
Publication of WO2022141315A1 publication Critical patent/WO2022141315A1/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
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G02B9/14—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only arranged + - +

Definitions

  • the present application relates to the field of optical technology, and in particular, to an optical system, a photographing device using the optical system, and a movable platform.
  • photographing devices such as aerial cameras, action cameras or handheld cameras
  • the size of the optical system used by the photographing device must also be reduced in size and miniaturization under the market trend.
  • the lens structure of the existing optical system cannot be realized. Therefore, it is necessary to provide an optical system that can satisfy the miniaturization.
  • the embodiments of the present application provide an optical system, a photographing device, and a movable platform.
  • the optical system is beneficial to the miniaturization of the product, and at the same time, it can realize long-distance photography and have a large zoom ratio.
  • an embodiment of the present application provides an optical system, which is used to image a photographed object on an image sensor, and the optical system includes:
  • the third lens has positive refractive power
  • a reflector for changing the propagation direction of light passing through the first lens, the second lens and the third lens and reflecting the light to the image sensor
  • optical system satisfies the following expression:
  • T t1 is the light on the optical axis reflected from the center point of the object side lens surface of the first lens to the image sensor through the first lens, the second lens, the third lens and the reflector
  • the propagation distance, Effl is the effective focal length of the optical system.
  • an embodiment of the present application further provides a photographing device, where the photographing device includes the optical system and the image sensor according to any one of the embodiments of the present application, wherein the optical system is configured between the photographed object and the image sensor.
  • the optical path of the image sensor is used to image the photographed object on the image sensor.
  • the present application further provides a movable platform, the movable platform includes a platform body and a photographing device, and the photographing device is mounted on the platform body; the photographing device includes the The optical system and the image sensor according to any one of the above, wherein the optical system is arranged in an optical path between a photographed object and the image sensor, and is used for imaging the photographed object on the image sensor.
  • the optical system, the photographing device, and the movable platform provided by the embodiments of the present application, wherein the optical system is installed on the photographing device, the photographing device can be installed on the main body of the movable platform, and the optical system utilizes three lenses and a reflecting mirror. Combination and specific parameter settings can reduce the volume of the product, and at the same time have long-distance photography and a large zoom ratio.
  • FIG. 1 is a schematic structural diagram of an optical system provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an effective pixel area of an optical system provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a field of view of an image sensor provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of another optical system provided by an embodiment of the present application.
  • FIG. 5 is a schematic configuration diagram of an optical system provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of the effect of field curvature of an optical system provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the distortion effect of the optical system provided by the embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a photographing device provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a movable platform provided by an embodiment of the present application.
  • 100 an optical system; 101, a first lens; 102, a second lens; 103, a third lens, 104, a reflector;
  • a photographing device 20, an image sensor; 22, a photographed object; 220, an image of the photographed object; 211, a display screen; 212, a photographing button;
  • 300 a movable platform; 30, the platform body.
  • FIG. 1 is a schematic structural diagram of an optical system provided by an embodiment of the present application.
  • the optical system can reduce the volume of the product (optical system, photographing device or movable platform), at the same time, it has telephotography and large zoom magnification.
  • the optical system 100 includes a first lens 101 , a second lens 102 , a third lens 103 and a reflecting mirror 104 arranged in sequence from the object side to the image side, and is used to image the photographed object on the image sensor 20 Imaging.
  • the first lens 101 has positive refractive power
  • the second lens 102 has negative refractive power
  • the third lens 103 has positive refractive power
  • the reflector 104 changes the light passing through the first lens 101 , the second lens 102 and the third lens 102 and reflect the light to the image sensor 20 .
  • the propagation direction of the light reflected by the mirror 104 and the propagation direction of the light passing through the first lens 101 , the second lens 102 and the third lens 102 form a preset angle, and the size of the preset angle is not here. Make restrictions and set according to actual needs.
  • the propagation direction of the light reflected by the mirror 104 is perpendicular to the propagation direction of the light passing through the first lens 101 , the second lens 102 and the third lens 102 , that is, a preset angle. is 90°. In some other embodiments, it can also be other angles, such as 60° or 120°.
  • optical system 100 satisfies the following expression:
  • T tl is the distance from the center point of the object-side lens surface of the first lens 101 to the image sensor 20, specifically, the light on the optical axis passes through the first lens 101 from the center point of the object-side lens surface of the first lens 101.
  • the propagation distance of a lens 101, a second lens 102, a third lens 103 and a mirror 104 reflected to the image sensor 20, Effl is the effective focal length of the optical system 100.
  • the propagation distance of the light ray from the center point of the object side lens surface of the first lens 101 through the second lens 102 and the third lens 103 to the mirror 104 , d 12 The propagation distance of the light ray reflected by the mirror 104 to the image sensor 20 .
  • the optical system provided by the above embodiment utilizes the combination of three lenses and one mirror and the setting of specific parameters to realize the optical path folding design, thereby realizing the miniaturization of the length, width and height of the optical system, thereby reducing the size of the optical system. It also has the advantages of long-distance photography and large zoom magnification, which improves the imaging quality of the optical system.
  • the parameter settings of the three lenses can also enable the optical system to image in a wider spectral range, which is beneficial to increase the color richness of the image, thereby improving the user experience.
  • the diaphragm (aperture diaphragm) of the optical system 100 is located between the second lens 102 and the third lens 103 .
  • the optical system 100 in order to further reduce the volume of the optical system and increase the field of view of the optical system. It can also be defined that the optical system 100 satisfies the following expression:
  • T t1 is the distance from the center point of the object-side lens surface of the first lens 101 to the image sensor 20, and I mgh is half the diagonal length of the effective pixel area of the optical system.
  • FIG. 2 shows the effective pixel area of the optical system 100 provided by the embodiment of the present application, and I mgh is half of the diagonal length of the effective pixel area of the optical system 100.
  • the shape of the effective pixel area can be a circle, a square or a rectangle, etc.
  • the optical system 100 satisfies the following expression:
  • H FOV is half the angle of view in the diagonal direction of the image sensor 20 , specifically, as shown in FIG. 3 .
  • optical system in order to further reduce the volume of the optical system and increase the field of view of the optical system.
  • the optical system satisfies the following expression:
  • T tl is the distance from the center point of the object-side lens surface of the first lens 101 to the image sensor 20
  • B f1 is the distance from the center point of the image-side lens surface of the third lens 103 to the image sensor 20 .
  • optical system 100 in order to further realize the telephoto function of the optical system and improve the imaging quality of the optical system.
  • the optical system 100 can be defined to satisfy the following expression:
  • c 21 is the radius of curvature of the object-side lens surface of the second lens 102
  • c 22 is the radius of curvature of the image-side lens surface of the second lens 102 .
  • the optical system can also be defined to satisfy: This is beneficial to the balance of the optical power of the optical system, and at the same time, the sensitivity of the lens of the optical system can be alleviated, thereby improving the imaging quality of the optical system.
  • the optical system in order to further improve the imaging quality of the optical system, can also be defined to satisfy the following expression:
  • CT 12 is the separation distance between the center point of the image-side lens surface of the first lens 101 and the center point of the object-side lens surface of the second lens 102 , that is, the image-side lens of the first lens 101 The distance in the optical axis direction between the surface and the object-side lens surface of the second lens 102 .
  • the optical system satisfying Expression (6) can effectively suppress the "ghost image" of the optical system, especially the partial "ghost image” generated by the edge of the first lens, thereby improving the imaging quality of the optical system.
  • the miniaturization of the optical system is further realized. It can also be defined that the optical system 100 satisfies the following expression:
  • CT 12 is the separation distance from the center point of the lens surface on the image side of the first lens 101 to the center point of the lens surface on the object side of the second lens 102
  • CT 23 is the image side of the second lens 102
  • Satisfying the expression (7) can help to balance the sensitivity of the optical system, thereby realizing the miniaturization of the optical system.
  • the optical system 100 in order to further realize the miniaturization of the optical system and improve the imaging quality of the optical system. It can also be defined that the optical system 100 satisfies the following expression:
  • c 11 is the radius of curvature of the object-side lens surface of the first lens 101
  • c 12 is the radius of curvature of the image-side lens surface of the first lens 101 .
  • Satisfying expression (8) is conducive to the balance of the optical power of the optical system, and can also compress the aperture size of multiple transverse lenses, thereby realizing the miniaturization of the optical system, and at the same time, it can reduce the sensitivity of the lens of the optical system, thereby improving imaging. quality.
  • the optical system 100 in order to further realize the miniaturization of the optical system, can also be defined to satisfy the following expressions:
  • f2 is the effective focal length of the second lens 102
  • Effl is the effective focal length of the optical system 100.
  • the optical system in order to improve the imaging quality of the optical system, can also be defined to satisfy the following expression:
  • VD 1 is the dispersion coefficient of the first lens 101 , that is, the Abbe number.
  • the optical system in order to further improve the imaging quality of the optical system, can be defined to satisfy the following expression:
  • VD 1 is the dispersion coefficient of the first lens 101
  • ND 1 is the refractive index of the first lens 101
  • VD 2 is the dispersion coefficient of the second lens 102
  • ND 2 is the refractive index of the second lens 102 ratio
  • VD 3 is the dispersion coefficient of the third lens 103
  • ND 3 is the refractive index of the third lens 103 .
  • the optical system 100 is limited to satisfy the following expressions 18 ⁇ VD 2 ⁇ 35, 1.5 ⁇ ND 2 ⁇ 1.7.
  • the imaging quality of the optical system can be further improved.
  • the length units involved in the embodiments of the present application are all millimeters, that is, mm, such as focal length, curvature radius, separation distance, aperture size, and the like.
  • At least one aspheric lens may be included in the first lens 101 , the second lens 102 and the third lens 102 .
  • the second lens 102 is an aspherical lens
  • the first lens 101 , the second lens 102 and the third lens 103 are all aspherical lenses.
  • At least one plastic lens may be included in the first lens 101 , the second lens 102 and the third lens 103 .
  • the first lens 101 is a glass lens
  • the second lens 102 and the third lens 103 are plastic lenses.
  • the first lens 101 is a glass lens, which can prevent the optical system from being damaged by scratches. Meanwhile, the combination of the glass lens and the plastic lens can reduce the weight of the optical system, thereby realizing the lightness of the optical system. If the movable platform uses the optical system, the battery life of the movable platform can be increased.
  • the second lens 102 is a plastic lens, or the second lens 102 is a plastic lens and an aspherical lens.
  • the second lens 102 can also be used as a focusing lens.
  • the plastic lens is conducive to the light weight of the focus and reduces the power consumption of the focus motor, thereby increasing the battery life of the product.
  • the mirror 104 may be at least one of a flat mirror and a total reflection prism.
  • the reflector 104 is a flat reflector, or as shown in FIG. 4 , the reflector 104 is a total reflection prism.
  • the first lens 101 , the second lens 102 , and the third lens 103 may have one lens surface that is aspherical, or both lens surfaces may be aspherical.
  • one mirror surface of the aspherical lens or all aspherical lens surfaces may be high-order aspherical surfaces, and the high-order aspherical surfaces satisfy the following expression:
  • z is the rotational symmetry axis of the aspheric surface
  • c is the curvature of the center point
  • y is the radial coordinate, whose unit is the same as the unit length of the lens
  • k is the quadratic curve constant, a 1 to a 8 represent respectively The coefficients corresponding to each radial coordinate.
  • the surface numbers 1, 2, 3, 4, 6, 7, 8, and 9 represent the surface numbers in the optical system, which represent the mirror surface of the first lens 101, The mirror surface of the second lens 102 , the mirror surface of the third lens 103 and the mirror 101 .
  • the two lens surfaces of the first lens 101 are the surface S1 and the surface S2 respectively
  • the two lens surfaces of the second lens 102 are the surface S3 and the surface S4 respectively
  • the STO represents the diaphragm
  • the third The two lens surfaces of the lens 103 are the surface S5 and the surface S7 respectively
  • the two mirror surfaces of the reflecting mirror 104 are the surface S8 and the surface S9 respectively, wherein the reflecting mirror 104 is a plane mirror.
  • the number of faces indicates the surface of the lens
  • the type indicates the shape of the surface
  • "STANDRAD” indicates a plane
  • "EVENASPH” indicates an aspheric surface
  • the radius of curvature indicates the degree of curvature of the lens surface, which can be expressed by R.
  • the interval or thickness (Thickness) the interval is expressed as the separation distance between the lenses of the optical system on the optical axis, and the thickness is the central thickness of the lens
  • ND represents the refractive index of the lens
  • VD represents the dispersion coefficient of the lens, Also called Abbe coefficient
  • "Infinity” means plane
  • Obj means object side
  • STO means stop plane
  • Ima means image side.
  • T t1 is the distance from the center point of the object-side lens surface of the first lens of the optical system to the image sensor
  • 1 mgh is half of the diagonal length of the effective pixel area of the optical system
  • H FOV is the diagonal angle of the image sensor Half of the field of view in the line direction.
  • Example 1 the optical systems corresponding to Tables 1 to 3 are referred to as Example 1.
  • Table 1 is the surface parameter data of the lens of the optical system of Example 1
  • Table 2 is the aspheric coefficient data of the optical system lens-surface of Example 1
  • FIG. 6 and FIG. 7 are the field curvature parameters and distortion parameters of the optical system of Example 1, respectively. It can be seen from FIG. 6 and FIG. 7 that the optical system has a better imaging effect and therefore has a higher imaging quality.
  • FIG. 8 is a schematic structural diagram of a photographing apparatus provided by an embodiment of the present application.
  • the photographing device 200 can realize the miniaturization of the product, and at the same time has a long-distance photography and a larger zoom ratio, thereby improving the imaging quality of the photographing device 200 .
  • the photographing device 200 includes an optical system 100 and an image sensor (not shown), and the optical system 100 is arranged in the optical path between the photographed object 22 and the image sensor.
  • the optical system 100 adopts any one of the optical systems provided in the above embodiments, and the image sensor may be, for example, a CMOS sensor or a CCD sensor.
  • the photographing apparatus 200 may also be an electronic device for photographing, including a mobile phone, a digital camera, a motion camera, a wearable device, or a handheld PTZ camera.
  • the photographing device 200 may be a motion camera, including a display screen 211 and a photographing button 212 .
  • the optical system 100 is used to image the photographed object 22 (such as a scene) on the image sensor of the photographing device 200;
  • the display screen 211 is used to display imaging, such as displaying the image 220 of the object to be photographed, and the display screen 211 may specifically be a touch display screen;
  • the shooting button 212 is used to trigger shooting.
  • the photographing device in the above embodiment uses the optical system provided by the embodiment of the present application, thereby increasing the field of view of the photographing device, improving the imaging quality of the photographing device, and simultaneously realizing the miniaturization of the product.
  • FIG. 9 is a schematic structural diagram of a movable platform provided by an embodiment of the present application.
  • the movable platform is equipped with a photographing device to realize photographing.
  • the movable platform 300 includes a platform body 30 and a photographing device 200.
  • the photographing device 200 is mounted on the platform body 30.
  • the optical system 100 is configured in the optical path between the photographed object and the image sensor, and is used to image the photographed object on the image sensor.
  • the movable platform 300 includes any one of a drone, a robot, an unmanned vehicle, and a handheld gimbal.
  • the aircraft includes an unmanned aerial vehicle
  • the unmanned aerial vehicle includes a rotary-wing unmanned aerial vehicle, such as a quad-rotor unmanned aerial vehicle, a six-rotor unmanned aerial vehicle, an eight-rotored unmanned aerial vehicle, or a fixed-wing unmanned aerial vehicle. It is a combination of rotary-wing and fixed-wing drones, which is not limited here.
  • the robot can also be called an educational robot. It uses a Mecanum wheel omnidirectional chassis, and is equipped with multiple pieces of intelligent armor. Each intelligent armor has a built-in strike detection module, which can quickly detect physical strikes. At the same time, it also includes a two-axis gimbal, which can be rotated flexibly. With the launcher, it can accurately, stably, and continuously launch crystal bullets or infrared beams. With ballistic light effects, it gives users a more realistic shooting experience.
  • the optical system is installed on the drone, because the optical system can increase the field of view of the lens, it can shoot a wide range of scenes, and at the same time can improve the imaging quality of the shooting device, and the combination of multiple lenses makes the relative distance Smaller, thereby reducing the volume of the optical system, realizing miniaturization and lightening. Therefore, when the drone is used for aerial photography, better images can be captured by using the optical system, thereby improving the user's experience.

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

L'invention concerne un système optique (100), un dispositif photographique (200) et une plateforme mobile (300). Le système optique (100) comprend une première lentille (101), une deuxième lentille (102), une troisième lentille (103) et une quatrième lentille (104) qui sont agencées séquentiellement d'un côté objet à un côté image. La première lentille (101) et la troisième lentille (103) ont une puissance focale positive, et la deuxième lentille (102) a une puissance focale négative ; le réflecteur (104) est utilisé pour changer la direction de propagation de la lumière et réfléchir la lumière vers un capteur d'image (20). Le système optique (100) satisfait l'expression suivante : 1,0 ≤ Ttl/Effl ≤ 1,5, Ttl étant la distance du point central de surface de lentille côté objet de la première lentille (101) au capteur d'image (20), la distance étant la distance de propagation de la lumière sur l'axe optique traversant la deuxième lentille (102), la troisième lentille (103) et le réflecteur (104) depuis le point central de surface de lentille côté objet de la première lentille (101) vers le capteur d'image (20), et Effl étant une longueur focale effective du système optique.
PCT/CN2020/141840 2020-12-30 2020-12-30 Système optique, dispositif photographique et plateforme mobile WO2022141315A1 (fr)

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PCT/CN2020/141840 WO2022141315A1 (fr) 2020-12-30 2020-12-30 Système optique, dispositif photographique et plateforme mobile

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PCT/CN2020/141840 WO2022141315A1 (fr) 2020-12-30 2020-12-30 Système optique, dispositif photographique et plateforme mobile

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030095341A1 (en) * 2001-11-16 2003-05-22 Fuji Photo Optical Co., Ltd. Single-focus lens
US20130063830A1 (en) * 2011-09-14 2013-03-14 Samsung Electro-Mechanics Co., Ltd. Subminiature optical system
CN111399173A (zh) * 2016-11-24 2020-07-10 大立光电股份有限公司 影像撷取镜头组及取像装置
CN111399186A (zh) * 2020-04-29 2020-07-10 南昌欧菲精密光学制品有限公司 光学系统、摄像模组及电子设备
CN211603693U (zh) * 2020-04-17 2020-09-29 广州长步道光电科技有限公司 一种35mm工业镜头系统
CN112147766A (zh) * 2019-06-28 2020-12-29 南昌欧菲精密光学制品有限公司 成像镜头、摄像模组及电子装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030095341A1 (en) * 2001-11-16 2003-05-22 Fuji Photo Optical Co., Ltd. Single-focus lens
US20130063830A1 (en) * 2011-09-14 2013-03-14 Samsung Electro-Mechanics Co., Ltd. Subminiature optical system
CN111399173A (zh) * 2016-11-24 2020-07-10 大立光电股份有限公司 影像撷取镜头组及取像装置
CN112147766A (zh) * 2019-06-28 2020-12-29 南昌欧菲精密光学制品有限公司 成像镜头、摄像模组及电子装置
CN211603693U (zh) * 2020-04-17 2020-09-29 广州长步道光电科技有限公司 一种35mm工业镜头系统
CN111399186A (zh) * 2020-04-29 2020-07-10 南昌欧菲精密光学制品有限公司 光学系统、摄像模组及电子设备

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