WO2022141124A1 - Système optique, dispositif de caméra, cardan et plateforme mobile - Google Patents

Système optique, dispositif de caméra, cardan et plateforme mobile Download PDF

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Publication number
WO2022141124A1
WO2022141124A1 PCT/CN2020/141087 CN2020141087W WO2022141124A1 WO 2022141124 A1 WO2022141124 A1 WO 2022141124A1 CN 2020141087 W CN2020141087 W CN 2020141087W WO 2022141124 A1 WO2022141124 A1 WO 2022141124A1
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WO
WIPO (PCT)
Prior art keywords
lens
optical system
image
photographing device
following expression
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Application number
PCT/CN2020/141087
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English (en)
Chinese (zh)
Inventor
牛一凡
毛庆
Original Assignee
深圳市大疆创新科技有限公司
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Priority to PCT/CN2020/141087 priority Critical patent/WO2022141124A1/fr
Publication of WO2022141124A1 publication Critical patent/WO2022141124A1/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

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 the optical system is required to be a wide-angle lens.
  • the incident light of a wide-angle lens in a strong light environment will bring stray light, which will affect the imaging clarity of the optical system.
  • 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 reduces stray light caused by incident light in a strong light environment. The impact of the optical system can improve the imaging clarity.
  • an embodiment of the present application provides an optical system, the optical system comprising: sequentially arranged from the object side to the image side:
  • a third lens having negative refractive power and serving as a focusing lens of the optical system
  • the fourth lens with positive refractive power
  • the fifth lens with positive refractive power
  • the sixth lens with negative refractive power
  • the seventh lens with positive refractive power
  • optical system satisfies the following expression:
  • G 12 is the effective aperture of the image-side lens surface of the first lens
  • G 22 is the effective aperture of the image-side lens surface of the second lens
  • R 12 is the image-side lens surface of the first lens.
  • the curvature radius, R 22 is the curvature radius of the image-side lens surface of the second lens.
  • 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 head, the pan/tilt head is equipped with 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 the optical system with a large field of view, so as to adapt to large-sized image sensors (such as 1-inch image sensors), and at the same time, it can reduce the incidence in strong light environments. The stray light reflection caused by light, thereby improving the image 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 the field curvature of the optical system provided by the embodiment of the present application at an infinite object distance;
  • FIG. 5 is a schematic diagram of the effect of distortion of an optical system provided by an embodiment of the present application at an infinite object distance;
  • FIG. 6 is a schematic diagram of the effect of the field curvature of the optical system provided by the embodiment of the present application under the minimum object distance;
  • FIG. 7 is a schematic diagram of the distortion effect of the optical system provided by the embodiment of the present application under the minimum object distance;
  • 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.
  • FIG. 10 is a schematic structural diagram of a 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;
  • 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 negative power
  • the third lens 103 has negative power
  • the fourth lens 104 has positive power
  • the fifth lens 105 has positive power
  • the sixth lens 105 has positive power.
  • the lens 106 has negative refractive power
  • the seventh lens 107 has positive refractive power.
  • the third lens 103 is used as the focusing lens of the optical system 100, that is, the focusing function can be realized by the third lens 103. Since only one lens is used in the optical system 100 to realize the focusing function, the focusing function can be reduced. The weight of the focusing lens reduces the power consumption of focusing, thereby improving the battery life of the product.
  • the product may be, for example, a photographing device using the optical system 100, such as a camera, a handheld gimbal, a mobile phone, a tablet computer, and the like.
  • optical system 100 satisfies the following expression:
  • G 12 is the effective aperture of the image-side lens surface of the first lens 101
  • G 22 is the effective aperture of the image-side lens surface of the second lens 102
  • R 12 is the image-side lens surface of the first lens 101
  • the curvature radius of the lens surface, R 22 is the curvature radius of the image-side lens surface of the second lens 102 .
  • the optical system satisfying the expression (1) can effectively reduce the stray light reflection caused by the incident light, thereby improving the imaging clarity of the optical system.
  • the coating uniformity of the image-side lens surface of the first lens can be improved, and the stability of the optical system can be further improved.
  • the effective aperture can also be called “aperture”, “maximum aperture”, etc., and specifically refers to the ratio of the beam diameter (also called the lens diameter) of the front mirror to the focal length of each lens when the aperture is fully opened. Indicates the light receiving capability of the lens' maximum aperture.
  • the optical system provided by the above embodiment utilizes a combination of seven lenses to set specific parameters, so that the optical system can have a larger field of view, so as to adapt to a large-sized image sensor (such as a 1-inch image sensor), and at the same time in a strong light environment. It can reduce the stray light reflection caused by the incident light, thereby improving the imaging quality.
  • the focus function is achieved by using a single lens, which in turn improves the battery life of the product.
  • the fifth lens 105 and the sixth lens 106 may be provided as a cemented lens.
  • the image-side lens surface of the fifth lens 105 and the object-side lens surface of the sixth lens 106 have the same radius of curvature.
  • the optical system 100 may also be defined to satisfy the expression: t 7 ⁇ 9 mm, where t 7 is the imaging of the image-side lens surface of the seventh lens 107 to the optical system 100 The distance of the plane IMA in the direction of the optical axis.
  • the interchangeable solution means that the optical system 100 can be detachably installed on different photographing devices, so as to realize the interchangeable use.
  • the aperture stop STO of the optical system 100 is located between the fourth lens 104 and the fifth lens 105 .
  • the optical system 100 can also be defined to satisfy the following expressions:
  • t 4 is the distance from the image-side lens surface of the fourth lens 104 to the aperture stop STO in the optical axis direction
  • t 5 is the distance from the aperture stop STO to the object-side lens surface of the fifth lens 105 at The distance in the direction of the optical axis.
  • the optical system 100 can satisfy all strokes in the optical, mechanical and motor focusing process.
  • the optical system 100 includes a variable aperture and a mechanical shutter, both of which are disposed between the fourth lens 104 and the fifth lens 105 .
  • the optical system satisfying Expression (2) facilitates the setting of the variable aperture and the mechanical shutter, and at the same time, the use of the mechanical shutter can also avoid the jelly effect of the optical system, thereby improving the imaging quality of the optical system.
  • the jelly effect is when the exposure time is too long, and the photo can be blurred, or the result of the shot can be any kind of "tilt”, "wobbly”, or "partially exposed”.
  • the optical system 100 in order to realize the optical system has a larger angle of view and also has a better focusing function. It can also be defined that the optical system 100 satisfies the following expression:
  • t 21 is the distance in the optical axis direction from the image-side lens surface of the second lens 102 to the object-side lens surface of the third lens 103 at an infinite object distance (INF object distance)
  • t 22 is the distance from the image-side lens surface of the second lens 102 to the object-side lens surface of the third lens 103 in the direction of the optical axis under the minimum object distance (MOD object distance, for example, 0.3m)
  • t 31 is the infinity
  • t 32 is the first object distance at the minimum object distance (MOD object distance).
  • the optical system 100 may also be defined to satisfy the following expression:
  • R 12 is the radius of curvature of the image-side lens surface of the first lens 101
  • R 21 is the radius of curvature of the object-side lens surface of the second lens 102 .
  • the optical system satisfying the expression (4) can effectively reduce the sensitivity of the first lens 101 and the second lens 102 to the optical system, thereby improving the imaging quality of the optical system.
  • the optical system 100 may also be limited to satisfy the following expression:
  • t 67 is the distance in the optical axis direction from the image-side lens surface of the sixth lens 106 to the object-side lens surface of the seventh lens 107 .
  • the optical system satisfying the expression (5) can ensure that the sixth lens 106 and the seventh lens 107 are in contact with each other, thereby effectively improving the reflection of light in the regions corresponding to the sixth lens and the seventh lens, thereby improving the optical The imaging quality of the system.
  • the optical system 100 in order to improve the imaging quality of the optical system and to facilitate the miniaturization of the optical system. It can also be defined that the optical system 100 satisfies the following expression:
  • f 3 is the effective focal length of the third lens 103 .
  • the optical system satisfying the expression (6) can effectively control the focusing sensitivity of the optical system, and at the same time, it is beneficial to make the focusing lens smaller, thereby facilitating the miniaturization of the optical system.
  • some or all of the lenses of the optical system 100 are made of glass.
  • the second lens 102 , the third lens 103 and/or the seventh lens 107 of the optical system 100 may be made of glass.
  • Other lenses use non-glass lenses, such as plastic lenses.
  • the combination of glass lens and plastic lens can effectively solve 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 expression:
  • nd 1 , nd 2 , nd 3 , nd 4 , nd 5 , nd 6 and nd 7 are the first lens 101 , the second lens 102 , the third lens 103 , the fourth lens 104 , the The refractive indices of the fifth lens 105, the sixth lens 106 and the seventh lens 107; vd 1 , vd 2 , vd 3 , vd 4 , vd 5 , vd 6 and vd 7 are the first lens 101, the second lens 102,
  • the dispersion coefficients of the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106 and the seventh lens 107, the dispersion system is also called Abbe number.
  • 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 .
  • the filter lens 108 includes an IR lens, which is used to filter out infrared light to eliminate chromatic aberration caused by infrared light, thereby improving the imaging quality of the optical system.
  • some or all of the lenses of the optical system 100 may also be defined as aspherical lenses.
  • the second lens 102 , the third lens 103 and/or the seventh lens 103 of the optical system 100 may be set as aspherical lenses.
  • the second lens 102 , the third lens 103 and/or the seventh lens 103 of the optical system 100 may be set as aspherical lenses.
  • several other lenses can be spherical lenses.
  • one mirror surface or all aspherical lens surfaces of the above-mentioned aspherical lens may be a high-order aspherical surface, and the high-order aspherical surface satisfies 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 respectively represent 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 inch, thereby ensuring that the optical system 100 can be adapted to images of 1 inch and larger than 1 inch sensor.
  • the specific numerical configuration of the optical system is given below in conjunction with the accompanying drawings and the table.
  • the surface numbers 1, 2, 3, 4, 6, 7, 8, 9... in the table represent the surface numbers in the optical system, respectively.
  • the surface F1 represents the incident surface of light.
  • the two lens surfaces of the first lens 101 are respectively the surface F2 and the surface F3 and the two lens surfaces of the second lens 102 are respectively are the surface F4 and the surface F5
  • the two lens surfaces of the third lens 103 are respectively the surface F6 and the surface F7
  • the two lens surfaces of the fourth lens 104 are the surface F8 and the surface F9 respectively
  • STO represents the diaphragm
  • the fifth lens 105 The two lens surfaces of the sixth lens 106 are the surface F11 and the surface F12 respectively
  • the two lens surfaces of the sixth lens 106 are the surface F12 and the surface F13 respectively
  • the two lens surfaces of the seventh lens 107 are the surface F14 and the surface F15 respectively
  • the two mirror surfaces of 108 are surface F16 and 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 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
  • STO stop plane
  • IMA means image 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.
  • CT 0 represents the object distance, specifically INF (infinity object distance) and 0.3m (minimum object distance)
  • CT 1 represents the distance between the image side lens surface of the second lens 102 and the object side lens surface of the third lens 103 on the optical axis
  • CT 2 represents the image side lens surface of the third lens 103 to the object side of the fourth lens 104 respectively.
  • the lens faces are spaced a distance on the optical axis.
  • 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
  • the surface 18 in Table 1 is the paraxial light compensation surface of the optical system.
  • Table 2 is the aspheric coefficient data of the optical system lens-surface of Example 1
  • Fig. 4 and Fig. 5 are respectively the field curvature parameters and distortion parameters of the optical system of the example of Embodiment 1 under the infinite object distance, the infinite object distance is that the incident light is parallel light;
  • Fig. 6 and Fig. 7 are respectively Embodiment 1
  • the field curvature parameters and distortion parameters of the example optical system at the minimum object distance (0.3 meters) are shown in Figure 4, Figure 5, Figure 6, and Figure 7. It can be seen that the optical system has a better imaging effect, so it 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 increase the imaging area and use a larger-sized image sensor, such as a 1-inch image sensor, while reducing the stray light reflection caused by incident light, thereby improving the 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 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 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 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, 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 head, the pan/tilt head is equipped with 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 is configured in The optical path between the photographed object and the image sensor is used to image the photographed object on the image sensor.
  • FIG. 10 shows the structure of a handheld pan/tilt provided by an embodiment of the present application.
  • the handheld gimbal is equipped with a photographing device to realize photographing.
  • the handheld gimbal 400 includes a grip portion 40 , a gimbal body 41 and a photographing device 200 .
  • the photographing device 200 is mounted on the gimbal body 41 , and the photographing device 200 is any one of the photographing devices provided in the above embodiments. , that is, it 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.
  • 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 can be integrated with the gimbal body, or can be detachably installed on the gimbal body, that is, the photographing device can be installed on the gimbal body when the user is using it, and the camera can be installed when not in use.
  • the photographing device is detached from the head 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 de caméra (200), un cardan (400) et une plateforme mobile (300). Le système optique (100) comprend une première lentille (101) ayant une puissance focale négative, une deuxième lentille (102) ayant une puissance focale négative, une troisième lentille (103) ayant une puissance focale négative, une quatrième lentille (104) ayant une puissance focale positive, une cinquième lentille (105) ayant une puissance focale positive, une sixième lentille (106) ayant une puissance focale négative, et une septième lentille (107) ayant une puissance focale positive qui sont agencées séquentiellement d'un côté objet à un côté image ; la troisième lentille (103) sert en tant que lentille de focalisation du système optique (100), et le système optique (100) satisfait l'expression : G12/R12 ≤ 1,83 et/ou G22/R22 ≤ 1,80, G12 étant l'ouverture effective d'une surface de lentille côté image de la première lentille (101), G22 étant l'ouverture effective d'une surface de lentille côté image de la deuxième lentille (102), R12 étant le rayon de courbure de la surface de lentille côté image de la première lentille (101), et R22 étant le rayon de courbure de la surface de lentille côté image de la deuxième lentille (102).
PCT/CN2020/141087 2020-12-29 2020-12-29 Système optique, dispositif de caméra, cardan et plateforme mobile WO2022141124A1 (fr)

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Publication number Priority date Publication date Assignee Title
US20050185301A1 (en) * 2004-02-22 2005-08-25 Leica Camera Ag Photographic objective of the modified double gauss type
CN104793316A (zh) * 2014-01-21 2015-07-22 三星泰科威株式会社 广角镜头系统
CN110389428A (zh) * 2018-04-18 2019-10-29 大立光电股份有限公司 摄像光学镜组、取像装置及电子装置
US20200081231A1 (en) * 2016-12-15 2020-03-12 Nidec Sankyo Corporation Wide angle lens
CN110908093A (zh) * 2019-12-30 2020-03-24 浙江舜宇光学有限公司 光学成像镜头
CN111279241A (zh) * 2017-12-12 2020-06-12 株式会社日东 摄像用的光学系统和摄像装置
CN112034594A (zh) * 2020-09-22 2020-12-04 南昌欧菲精密光学制品有限公司 光学成像系统以及具有其的取像装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050185301A1 (en) * 2004-02-22 2005-08-25 Leica Camera Ag Photographic objective of the modified double gauss type
CN104793316A (zh) * 2014-01-21 2015-07-22 三星泰科威株式会社 广角镜头系统
US20200081231A1 (en) * 2016-12-15 2020-03-12 Nidec Sankyo Corporation Wide angle lens
CN111279241A (zh) * 2017-12-12 2020-06-12 株式会社日东 摄像用的光学系统和摄像装置
CN110389428A (zh) * 2018-04-18 2019-10-29 大立光电股份有限公司 摄像光学镜组、取像装置及电子装置
CN110908093A (zh) * 2019-12-30 2020-03-24 浙江舜宇光学有限公司 光学成像镜头
CN112034594A (zh) * 2020-09-22 2020-12-04 南昌欧菲精密光学制品有限公司 光学成像系统以及具有其的取像装置

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