WO2022141120A1 - Système optique, dispositif photographique, cardan et plateforme mobile - Google Patents

Système optique, dispositif photographique, cardan et plateforme mobile Download PDF

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Publication number
WO2022141120A1
WO2022141120A1 PCT/CN2020/141083 CN2020141083W WO2022141120A1 WO 2022141120 A1 WO2022141120 A1 WO 2022141120A1 CN 2020141083 W CN2020141083 W CN 2020141083W WO 2022141120 A1 WO2022141120 A1 WO 2022141120A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical system
lenses
photographing device
following expression
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Application number
PCT/CN2020/141083
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English (en)
Chinese (zh)
Inventor
毛庆
Original Assignee
深圳市大疆创新科技有限公司
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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/CN2020/141083 priority Critical patent/WO2022141120A1/fr
Publication of WO2022141120A1 publication Critical patent/WO2022141120A1/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

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, a pan/tilt head, and a movable platform.
  • photographing devices such as aerial cameras, action cameras or handheld cameras
  • the optical system used in the photographing device must also be thinned and miniaturized under the market trend, and at the same time of miniaturization, the optical system is required to achieve a wide angle, so the peripheral image effect of the optical system imaging will be poor.
  • the embodiments of the present application provide an optical system, a photographing device, a pan/tilt head, and a movable platform.
  • the optical system has a larger field of view and can improve the image quality around the lens at the same time.
  • an embodiment of the present application provides an optical system, the optical system comprising: sequentially arranged from the object side to the image side:
  • the third lens has positive refractive power
  • the fourth lens with positive refractive power
  • the sixth lens with positive refractive power
  • the seventh lens with negative refractive power
  • optical system satisfies the following expression:
  • T 12 is the distance on the optical axis from the image-side lens surface of the first lens to the object-side lens surface of the second lens
  • CT 1 is the thickness of the first lens on the optical axis.
  • 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 pan/tilt, the pan/tilt is connected to a photographing device, and the photographing device includes the optical system and the image sensor according to any one of the embodiments of the present application, and the optical system It is arranged 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 present application further provides a movable platform, the movable platform includes a platform body and a photographing device, 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 can be installed on the photographing device, and the photographing device can be mounted on the pan-tilt or on the platform body of the movable platform.
  • the optical system uses a combination of seven lenses to set specific parameters, which can realize a larger field of view of the optical system, and at the same time can improve the image quality around the lens of the optical system, thereby improving the imaging quality.
  • FIG. 1 is a schematic structural diagram of an optical system provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of another optical system provided by an embodiment of the present application.
  • FIG. 3 is a schematic configuration diagram of an optical system provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of the effect of field curvature of an optical system provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the effect of optical system distortion provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a photographing device provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a movable platform provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a handheld cloud platform provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of another handheld gimbal provided by an embodiment of the present application.
  • 100 optical system; 101, first lens; 102, second lens; 103, third lens, 104, fourth lens; 105, fifth lens; 106, sixth lens; 107, seventh lens, 108, filter optical lens;
  • 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;
  • pan/tilt body 400 hand-held pan/tilt; 40, holding part; 41, pan/tilt body; 411, pitch axis motor; 412, roll axis motor; 413, translation axis motor.
  • FIG. 1 is a schematic structural diagram of an optical system provided by an embodiment of the present application.
  • the optical system has a larger field of view and can improve imaging quality.
  • the optical system 100 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106 and a The seventh lens 107 .
  • the first lens 101 has negative power
  • the second lens 102 has positive power
  • the third lens 103 has positive power
  • the fourth lens 104 has positive power
  • the fifth lens 105 has negative power
  • the sixth lens 106 has positive refractive power
  • the seventh lens 107 has negative refractive power.
  • the optical system 100 satisfies the following expressions:
  • T 12 is the distance on the optical axis from the image-side lens surface of the first lens 101 to the object-side lens surface of the second lens 102
  • CT 1 is the thickness of the first lens 101 on the optical axis .
  • the optical system utilizes a combination of specific parameter settings of seven lenses, which can not only achieve a larger field of view of the optical system, but also improve the image quality around the lens of the optical system, thereby improving the imaging quality.
  • the optical system in order to improve the imaging quality of the optical system, can also be defined to satisfy the following expression:
  • nd 1 , nd 2 , nd 3 , nd 4 , nd 5 , nd 6 , and nd 7 are the refractive indices of the first lens 101 to the seventh lens 107 , vd 1 , vd 2 , vd, respectively 3 , vd 4 , vd 5 , vd 6 , and vd 7 are the dispersion coefficients of the first lens 101 to the seventh lens 107 , which may also be called Abbe numbers.
  • the optical system that satisfies this expression has better imaging quality by defining the refractive index of the lens and the dispersion system of the optical system.
  • the optical system may also satisfy the following expression:
  • vd 5 is the dispersion coefficient of the fifth lens 105
  • vd 6 is the dispersion coefficient of the sixth lens 106
  • vd 7 is the dispersion coefficient of the seventh lens 107 .
  • part of the lenses of the optical system 100 may be glass lenses, and part of the lenses of the optical system 100 may be plastic lenses.
  • the hybrid design of glass lens and plastic lens can ensure that the temperature drift of the optical system is small in different temperature environments, so the imaging of the optical system is clearer and more stable, and the weight of the optical system can also be reduced, thereby improving the use of the optical system.
  • the battery life of the product of the optical system such as a movable platform, camera or mobile phone.
  • the first lens 101 and/or the fourth lens 104 are glass lenses.
  • the second lens 102, the third lens 103, the fifth lens 103, the sixth lens 106 and the seventh lens 107 are plastic lenses.
  • the first lens 101 and the fourth lens 104 are made of glass lenses
  • the second lens 102, the third lens 103, the fifth lens 103, the sixth lens 106 and the seventh lens 107 are made of plastic lenses, which can solve the problem more effectively.
  • the temperature drift problem of the optical system thereby improving the imaging quality of the optical system.
  • the optical system 100 may also be limited to satisfy the following expressions:
  • f 1 , f 2 , f 3 , f 4 , f 5 , f 6 , and f 7 are the first lens 101 , the second lens 102 , the third lens 103 , the fourth lens 104 , the The focal lengths of the five lenses 105, the sixth lens 106 and the seventh lens 107, and the unit of the focal length is millimeters.
  • the aperture stop STO of the optical system 100 is located between the third lens 103 and the fourth lens 104 .
  • the optical system 100 includes an aperture disposed between the third lens 103 and the fourth lens 104, wherein the aperture may include a variable aperture. It is beneficial to increase the field of view of the optical system, and at the same time, it can better balance the exit angle of the optical system, which is beneficial to match the image sensor of the corresponding size.
  • the optical system 100 in order to make the optical system miniaturized and have a larger field of view, the optical system 100 can be defined to satisfy the following expression:
  • T tl is the distance on the optical axis from the object-side lens surface of the first lens 101 to the imaging surface IMA of the optical system 100
  • E ffl 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:
  • f 2 is the focal length of the second lens 102
  • f 3 is the focal length of the third lens 103 .
  • the optical system 100 in order to increase the field of view of the optical system, can also be defined to satisfy the following expression:
  • R 1 is the radius of curvature of the object-side lens surface of the first lens 101
  • R 2 is the radius of curvature of the image-side lens surface of the first lens 101 .
  • the optical system 100 may also be defined to satisfy the following expression:
  • CT 5 is the thickness on the optical axis of the fifth lens 105
  • T 56 is the distance on the optical axis from the fifth lens 105 to the sixth lens 106 .
  • the optical system 100 further includes a filter lens 108 , and the filter lens 108 is disposed between the seventh lens 107 and the imaging plane IMA of the optical system 100 . Used to filter out some stray light, thereby improving image quality.
  • the filter lens 108 includes an infrared (IR) lens for filtering out infrared light to eliminate chromatic aberration caused by infrared light, thereby improving the imaging quality of the optical system.
  • IR infrared
  • some or all of the lenses of the optical system 100 may also be defined as aspherical lenses.
  • 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 size of the imaging surface of any optical system 100 provided in the embodiments of the present application is greater than or equal to 1/2 inch, thereby ensuring that the optical system 100 can be adapted to 1/2 inch and greater than or equal to 1/2 inch. 1/2 inch image sensor. Alternatively, the optical system can be adapted to 1/2 inch and 1/1.7 inch image sensors.
  • the surface numbers (surf) 1, 2, 3, 4, 6, 7, 8, 9... in the table represent the surface numbers in the optical system, respectively. , respectively represent the mirror surfaces and corresponding surfaces of the first lens 101 , the second lens 102 , the third lens 103 , the fourth lens 104 , the fifth lens 105 , the sixth lens 106 , the seventh lens 107 and the filter sheet 108 .
  • the two lens surfaces of the first lens 101 are the surface F1 and the surface F2 respectively
  • the two lens surfaces of the second lens 102 are the surface F3 and the surface F4 respectively
  • the two lens surfaces of the third lens 103 The lens surfaces are respectively the surface F5 and the surface F6, the two lens surfaces of the fourth lens 104 are the surface F8 and the surface F9 respectively
  • the two lens surfaces of the fifth lens 105 are the surface F10 and the surface F11 respectively
  • the two lens surfaces of the sixth lens 106 are respectively the surface F10 and the surface F11.
  • the lens surfaces are respectively the surface F12 and the surface F13, the two lens surfaces of the seventh lens 107 are the surface F14 and the surface F15 respectively, and the two mirror surfaces of the filter lens 108 are the surface F16 and the surface F17 respectively.
  • the serial number of the surface corresponds to the serial number of the surface under Surf in Table 1.
  • the number of surfaces represents the surface of the lens
  • the type (Type) represents the shape of the surface
  • "STANDRAD” represents a flat surface
  • "EVENASPH” represents an aspheric surface
  • the radius of curvature (Radius) represents the degree of curvature of the lens surface, which can be Represented by R, the smaller the R value, the more curved the lens surface
  • 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 means the refraction of the lens
  • VD represents the dispersion coefficient of the lens, also known as the Abbe coefficient
  • "Infinity” represents the plane
  • STO represents the diaphragm surface
  • IMA represents the image side
  • "OBJ” represents the object side.
  • Surf represents the number of faces
  • K is a quadratic curve constant
  • "4th-order term" to "10th-order term” indicate that a 2 to a 7 represent the coefficients corresponding to each radial coordinate, respectively.
  • Example 1 the optical systems corresponding to Tables 1 to 2 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. 4 and FIG. 5 are the field curvature parameters and distortion parameters corresponding to the optical system in Example 1, respectively.
  • the parameters are obtained by simulating the optical system when the wavelength of incident light is 546 nm.
  • the maximum value of the optical system in Example 1 is obtained by simulating the optical system.
  • the field of view angle is 80 degrees. It can be seen from Figures 4 and 5 that the optical system has a better imaging effect and therefore has a higher imaging quality.
  • FIG. 6 is a schematic structural diagram of a photographing apparatus provided by an embodiment of the present application.
  • the photographing device 200 can increase the imaging area and then use a larger-sized image sensor, such as a 1/2-inch or 1/1.7-inch image sensor, and at the same time improve the surrounding image quality, Further, the imaging quality of the photographing device 200 is improved.
  • 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 apparatus 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 the 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 realizing the miniaturization of the product.
  • FIG. 7 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, and an unmanned vehicle.
  • 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, steadily and continuously launch crystal bullets or infrared beams, and with ballistic light effects, it gives users a more realistic shooting experience.
  • 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.
  • An embodiment of the present application further provides a pan/tilt, which may be, for example, a handheld pan/tilt, and the pan/tilt is equipped with a photographing device, and the photographing device includes the optical system according to any one of the embodiments of the present application. and an image sensor, wherein the optical system is configured in the optical path between the photographed object and the image sensor, and is used for imaging the photographed object on the image sensor.
  • the handheld gimbal 400 includes a grip portion 40 , a gimbal body 41 and a photographing device 200 .
  • the photographing device 200 is installed on the gimbal body 41 , and the photographing device 200 is any one provided by the above embodiments.
  • a photographing device includes any one of the optical systems 100 provided in the above embodiments.
  • 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 photographing device 200 and the platform body 41 shown in FIG. 8 are fixedly connected. It can be understood that the photographing device 200 and the platform body 41 can also be detachably connected, that is, the photographing device can be connected to the platform body 41 when the handheld platform is not in use. Remove from the platform body 41 .
  • the handheld gimbal 400 includes a grip portion 40 and a gimbal body 41 .
  • the gimbal body 41 includes a three-axis gimbal, and specifically includes a pitch axis motor 411 , a roll axis motor 412 and a pan and tilt axis motor 411 .
  • the platform body can be equipped with a photographing device, and the photographing device includes any of the optical systems 100 provided in the above embodiments.
  • 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.
  • pan/tilt provided in the embodiments of the present application may be a two-axis pan/tilt or a three-axis pan/tilt, which is used for stabilization of the photographing device mounted on the pan/tilt.
  • the photographing device 200 in the hand-held platform shown in FIG. 8 is integrated with the body 41 of the platform, and the photographing device in the handheld platform shown in FIG. 9 can be detachably installed on the body 41 of the platform. That is, when the user is using, the photographing device is installed on the gimbal body 41, and when not in use, the photographing device is detached from the gimbal body for storage or carrying.

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

Abstract

L'invention concerne un système optique (100), un dispositif photographique (200), un cardan (400) et une plateforme mobile (300). Le système optique (100) comprend séquentiellement d'un côté objet à un côté image : une première lentille (101) ayant une puissance focale négative, une deuxième lentille (102) ayant une puissance focale positive, une troisième lentille (103) ayant une puissance focale positive, une quatrième lentille (104) ayant une puissance focale positive, une cinquième lentille (105) ayant une puissance focale négative, une sixième lentille (106) ayant une puissance focale positive et une septième lentille (107) ayant une puissance focale négative. Le système optique (100) satisfait l'expression suivante : 2≤T12/CT1≤8, où T12 est une distance entre une surface de lentille côté image de la première lentille (101) et une surface de lentille côté objet de la deuxième lentille (102) sur un axe optique, et CT1 est l'épaisseur de la première lentille (101) sur l'axe optique.
PCT/CN2020/141083 2020-12-29 2020-12-29 Système optique, dispositif photographique, cardan et plateforme mobile WO2022141120A1 (fr)

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PCT/CN2020/141083 WO2022141120A1 (fr) 2020-12-29 2020-12-29 Système optique, dispositif photographique, cardan et plateforme mobile

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016095460A (ja) * 2014-11-17 2016-05-26 富士フイルム株式会社 撮像レンズおよび撮像レンズを備えた撮像装置
CN107490841A (zh) * 2017-09-21 2017-12-19 浙江舜宇光学有限公司 摄像透镜组
CN108279486A (zh) * 2018-03-28 2018-07-13 中山联合光电科技股份有限公司 一种大像面高像素视频会议光学成像系统
CN210323542U (zh) * 2019-06-26 2020-04-14 南昌欧菲精密光学制品有限公司 广角镜头、图像拾取装置及电子装置
CN111198438A (zh) * 2020-03-05 2020-05-26 玉晶光电(厦门)有限公司 光学成像镜头
CN111344618A (zh) * 2017-11-10 2020-06-26 麦克赛尔株式会社 摄像透镜系统以及摄像装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016095460A (ja) * 2014-11-17 2016-05-26 富士フイルム株式会社 撮像レンズおよび撮像レンズを備えた撮像装置
CN107490841A (zh) * 2017-09-21 2017-12-19 浙江舜宇光学有限公司 摄像透镜组
CN111344618A (zh) * 2017-11-10 2020-06-26 麦克赛尔株式会社 摄像透镜系统以及摄像装置
CN108279486A (zh) * 2018-03-28 2018-07-13 中山联合光电科技股份有限公司 一种大像面高像素视频会议光学成像系统
CN210323542U (zh) * 2019-06-26 2020-04-14 南昌欧菲精密光学制品有限公司 广角镜头、图像拾取装置及电子装置
CN111198438A (zh) * 2020-03-05 2020-05-26 玉晶光电(厦门)有限公司 光学成像镜头

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