CN214669820U

CN214669820U - Optical system, shooting device, holder and movable platform

Info

Publication number: CN214669820U
Application number: CN202120584170.4U
Authority: CN
Inventors: 毛庆; 游旭
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-11-09
Anticipated expiration: 2031-03-22

Abstract

The utility model discloses an optical system, shooting device, cloud platform and movable platform, this optical system include from the thing side to the side of picture set gradually: a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal powerA fifth lens having positive refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, wherein a part of the lenses of the optical system is made of glass, a part of the lenses of the optical system is an aspherical lens, and the optical system satisfies the expression: -2. ltoreq. f₇/E_FFL≤0，f₇Is the focal length of the seventh lens, E_FFLIs the effective focal length of the optical system.

Description

Optical system, shooting device, holder and movable platform

Technical Field

The present application relates to the field of optical technologies, and in particular, to an optical system, a photographing apparatus using the optical system, a pan/tilt head, and a movable platform.

Background

With the development of photography, photographing devices (such as aerial cameras, motion cameras, or handheld cameras) tend to be light, thin, and small. Therefore, the optical system used by the shooting device needs to be thinned and miniaturized under the market trend, and the miniaturization can not be realized while the large image plane can not be considered.

SUMMERY OF THE UTILITY MODEL

Based on this, the embodiment of the application provides an optical system, a shooting device, a holder and a movable platform, wherein the optical system has a larger field angle, can be adapted to an image sensor with a large image plane, and has higher resolution.

In a first aspect, embodiments of the present application provide an optical system, including, in order from an object side to an image side:

a first lens having a positive refractive power;

a second lens having a negative focal power;

a third lens having a positive refractive power;

a fourth lens having a negative focal power;

a fifth lens having a positive refractive power;

a sixth lens having a positive refractive power;

a seventh lens having a negative power;

the partial lens of the optical system adopts a glass lens, the partial lens of the optical system is an aspheric lens, and the optical system satisfies the following expression:

-2≤f₇/E_FFL≤0

wherein f is₇Is the focal length of the seventh lens, E_FFLIs the effective focal length of the optical system.

In an optical system provided by the present application, the optical system satisfies the following expression:

0.5≤f₁₂₃/E_FFLless than or equal to 3.5; and/or the presence of a gas in the gas,

0.8≤|f₄₅/E_FFLless than or equal to 3; and/or the presence of a gas in the gas,

and/or the presence of a gas in the gas,

wherein f is₁₂₃A combined focal length corresponding to the first lens, the second lens and the third lens as a combined lens, f₄₅A combined focal length corresponding to the fourth lens and the fifth lens as a combined lens, c₃₁Is the radius of curvature of the object side lens surface of the third lens element, c₃₂Is the radius of curvature of the image-side lens surface of the third lens element, c₆₁Is the radius of curvature of the object side lens surface of the sixth lens element, c₆₂The radius of curvature of the image side lens surface of the sixth lens element.

In an optical system provided by the present application, the fourth lens and the fifth lens are used as focusing lenses.

0≤|D₄₅/E_FFLless than or equal to 0.2; and/or the presence of a gas in the gas,

1.2≤T_tl/E_FFLless than or equal to 2; and/or the presence of a gas in the gas,

T_6lnot less than 6mm

Wherein D is₄₅The fourth lens and the fifth lens are used as the travel amount of the focusing lens on the optical axis when focusing from an infinitely distant object to a close object, T_tlIs the distance between the object side lens surface of the first lens and the image sensor of the optical system on the optical axis, T_6lThe distance between the object side lens surface of the sixth lens and the image sensor of the optical system on the optical axis.

F_no≥2

wherein, F_noRepresenting the open f-number of the optical system from when an infinitely distant object is imaged sharp to when the aperture is opened to a maximum under the image plane.

1.25≤T_tl/(I_mgH2) is less than or equal to 2.5; and/or

20°≤H_FOVLess than or equal to 28 degrees; and/or

0.1≤B_fl/T_tl≤0.32

Wherein, T_tlIs the distance from the object side lens surface of the first lens to the image sensor of the optical system on the optical axis, I_mghIs one half of the diagonal of the effective pixel area of the optical system, H_FOVIs one half of the angle of view of the image sensor of the optical system in the diagonal direction, B_flThe distance between the image side lens surface of the seventh lens and the image sensor on the optical axis is included.

60≤V₆n is not less than 76 and not more than 1.5₆Less than or equal to 1.6; and/or the presence of a gas in the gas,

19≤V₃not less than 35 and not less than 1.9N₃≤2.1

Wherein, V₆Is the Abbe number, N, of the sixth lens₆Is a refractive index, V, of the sixth lens₃Is the Abbe number, N, of the third lens₃Is the refractive index of the third lens.

In an optical system provided by the present application, the first lens and the second lens are cemented lenses.

In an optical system provided by the present application, the optical system includes an iris diaphragm and a mechanical shutter, which are disposed between the third lens and the fourth lens.

In an optical system provided by the present application, the sixth lens is a glass lens, and/or the sixth lens is an aspheric lens.

In an optical system provided by the present application, the optical system further includes a filter lens and a protective lens, the filter lens being disposed between the seventh lens and an imaging surface of the optical system; the protective lens is arranged between the filter lens and the image sensor of the optical system and used for protecting a photosensitive element of the image sensor.

In an optical system provided herein, the filter lens includes an infrared filter lens.

In a second aspect, an embodiment of the present application further provides a photographing apparatus including the optical system and the image sensor provided in any one of embodiments of the present application, the optical system being disposed in an optical path between a photographic object and the image sensor, and being configured to image the photographic object onto the image sensor.

In a third aspect, the present application further provides a pan/tilt head, where the pan/tilt head is mounted with a shooting device, where the shooting device includes the optical system and the image sensor provided in the embodiments of the present application, and the optical system is disposed in an optical path between a shooting object and the image sensor, and is configured to form an image of the shooting object on the image sensor.

In a fourth aspect, the present application further provides a movable platform, where the movable platform includes a platform body and a shooting device, and the shooting device is carried on the platform body; the shooting device comprises the optical system and an image sensor, wherein the optical system is arranged in an optical path between a shooting object and the image sensor and is used for imaging the shooting object on the image sensor.

The optical system, the shooting device, the cloud platform and the movable platform provided by the embodiment of the application can be installed on the shooting device, the shooting device can be installed on the cloud platform or on the platform body of the movable platform, the optical system utilizes the combination specific parameter setting of seven lenses, and the optical system can be realized to have a larger field angle so as to be suitable for large-size image sensors (such as image sensors with the size of 1 inch and above) and improve the imaging quality.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an optical system provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another optical system provided in an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another optical system provided in an embodiment of the present application;

fig. 4 is a schematic configuration diagram of an optical system provided in an embodiment of the present application;

FIG. 5 is a schematic diagram illustrating an effect of field curvature of an optical system at an infinite object distance according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram illustrating distortion effects of an optical system at an infinite object distance according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a shooting device according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a movable platform provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of a handheld pan/tilt head provided in an embodiment of the present application.

Description of the main elements and symbols:

100. an optical system; 101. a first lens; 102. a second lens; 103. a third lens element 104, a fourth lens element; 105. a fifth lens; 106. a sixth lens; 107. a seventh lens, 108, a filter lens; 109. Protecting the lens;

200. a photographing device; 20. an image sensor; 22. shooting an object; 220. shooting an image of an object; 211. A display screen; 212. shooting a key;

300. a movable platform; 30. a platform body;

400. a handheld pan-tilt; 40. a grip portion; 41. cloud platform body.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present disclosure. The optical system has a large field angle, can be adapted to an image sensor having a large image plane, and can improve imaging quality.

As shown in fig. 1, 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 seventh lens 107, which are arranged in this order from an object side to an image side.

The first lens 101 has a negative power, the second lens 102 has a negative power, the third lens 103 has a positive power, the fourth lens 104 has a negative power, the fifth lens 105 has a positive power, the sixth lens 106 has a positive power, and the seventh lens 107 has a negative power.

Wherein the optical system 100 satisfies the following expression:

-2≤f₇/E_FFL≤0 (1)

in the expression (1), f₇Is the focal length of the seventh lens 107, E_FFLIs the effective focal length of the optical system 100. The optical system satisfying the expression (1) is beneficial to miniaturization of the optical system, and can be matched with an image sensor with a large image plane, such as an image sensor with the image plane being more than 1 inch, and the imaging definition of the optical system is also improved.

It should be noted that, in the embodiment of the present application, the lens of the optical system 100 is designed by using a wide spectrum, which is beneficial to increasing the richness of image colors, and further improving the user experience. The wide-spectrum design is that at least the working band of the optical system is within a preset band range, such as 340nm-800nm or 300nm-700nm, and the like, but other ranges are also possible.

Furthermore, the optical system 100 can be mounted as an interchangeable lens, for example, on a lens of a photographing apparatus in a detachable manner such as: one or more connection modes of magnetic attraction, adhesion, screw threads or buckles are used for fixed connection.

The optical system provided by the above embodiment utilizes the combination specific parameter setting of seven lenses, and can realize that the optical system has a larger field angle, can adapt to a large-size image sensor (such as an image sensor of 1 inch or more), and can obtain an image with higher resolution.

In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be further configured to satisfy the following expression:

0.5≤f₁₂₃/E_FFL≤3.5 (2)

in the expression (2), f₁₂₃The combined focal length corresponding to the first lens 101, the second lens 102 and the third lens 103 as a combined lens, i.e. the effective focal length of the first lens 101, the second lens 102 and the third lens 103 as a whole, E_FFLIs the effective focal length of the optical system 100. The optical system satisfying the expression (2) can be beneficial to balancing the focal power of the optical system, reducing the sensitivity of the optical system and further improving the imaging quality of the optical system.

In some embodiments, in order to achieve miniaturization of the optical system product and improve the cruising ability of a photographing device using the optical system, the fourth lens 104 and the fifth lens 105 of the optical system 100 may also be defined as focusing lenses. The fourth lens 104 and the fifth lens 105 are used as focusing lenses, so that the focusing structure is simple, the weight is low, the focusing mode in a single group is adopted for focusing, the light and thin property of a focusing group is realized, the close-range photography can be realized, the power consumption of a product is reduced, and the cruising ability of the product is improved.

In some embodiments, the optical system 100 may also be defined to satisfy the following expression:

0.8≤|f₄₅/E_FFL|≤3 (3)

in the expression (3), f₄₅The combined focal length corresponding to the fourth lens 104 and the fifth lens 105 as a combined lens can be understood as the effective focal length, E, of the fourth lens 104 and the fifth lens 105 as a whole_FFLIs the effective focal length of the optical system 100. The optical system satisfying the expression (3) can realize miniaturization of the optical system and can improve the imaging quality of the optical system at the same time.

0≤|D₄₅/E_FFL|≤0.2 (4)

in the expression (4), D₄₅Is at the same timeWhen focusing from an infinitely distant object to a close object, the fourth lens 104 and the fifth lens 105 travel on the optical axis as a focusing lens, E_FFLIs the effective focal length of the optical system 100. The optical system satisfying the expression (4) can not only realize a single-group focusing scheme, but also limit the travel amount of the focusing lens, thereby improving the imaging quality of the optical system in the focusing process.

In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be defined to satisfy the following expression:

in the expression (5), c₃₁Radius of curvature of the object side lens surface of the third lens element 103, c₃₂Is the radius of curvature of the image side lens surface of the third lens 103. The optical system satisfying the expression (5) is advantageous for balancing the focal power of the optical system and for reducing the sensitivity of the optical system.

In some embodiments, to achieve miniaturization of the optical system, the optical system 100 may be further defined to satisfy the following expression:

in the expression (6), c₆₁Is the radius of curvature of the object-side lens surface of the sixth lens element 106, c₆₂The radius of curvature of the image side lens surface of the sixth lens element 106. The optical system satisfying the expression (6) is beneficial to shortening the optical path difference, compressing the volume of the lens and miniaturizing the lens.

In some embodiments, in order to achieve the imaging quality of the optical system and increase the field angle of the optical system, and at the same time improve the imaging quality of the optical system, the optical system 100 may be further defined to satisfy the following expression: t is more than or equal to 1.2_tl/E_FFLLess than or equal to 2; and/or, 1.25 ≦ T_tl/(I_mgH2) is less than or equal to 2.5; and/or H is more than or equal to 20 degrees_FOV≤28 degrees; and/or the presence of a gas in the gas,

0.1≤B_fl/T_tl≤0.32 (7)

wherein, T_tlIs the distance on the optical axis from the object side lens surface of the first lens 101 to the image sensor of the optical system 100, E_FFLIs the effective focal length, I, of the optical system 100_mghIs one-half of the diagonal of the effective pixel area of the optical system 100, H_FOVIs one half of the field angle of the image sensor of the optical system 100 in the diagonal direction, B_flThe distance on the optical axis from the image side lens surface of the seventh lens 107 to the image sensor.

In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be further defined to satisfy the following expression: f_noIn the expression, F is more than or equal to 2_noRepresenting the open f-number of the optical system 100 from when an infinitely distant object is imaged sharp to when the aperture is opened to a maximum under the image plane.

In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be further defined to satisfy the following expression:

60≤V₆n is not less than 76 and not more than 1.5₆Less than or equal to 1.6; and/or 19. ltoreq. V₃Not less than 35 and not less than 1.9N₃≤2.1 (8)

In the expression (8), V₆Is the Abbe number, N, of the sixth lens 106₆Is the refractive index, V, of the sixth lens 106₃Is the Abbe number, N, of the third lens 103₃Is the refractive index of the third lens 103.

In some embodiments, in order to achieve volume miniaturization of the optical system, the first lens 101 and the second lens 102 may also be provided as cemented lenses. By gluing the first lens 101 and the second lens 102, the stability of the optical system and the imaging quality can be improved.

In some embodiments, the optical system 100 includes an iris diaphragm and a mechanical shutter, which are disposed between the third lens 103 and the fourth lens 104. The optical system is miniaturized, and meanwhile, a space containing the variable aperture and the mechanical shutter, namely the distance between the third lens 103 and the fourth lens 104, is reserved, so that the user experience is improved, the jelly effect of the optical system can be reduced by arranging the variable aperture and the mechanical shutter, and the imaging quality of the optical system is improved.

In some embodiments, in order to improve the imaging quality of the optical system and achieve miniaturization of the optical system, a part of lenses of the optical system 100 may be further configured as aspheric lenses, for example, the sixth lens 106 is configured as an aspheric lens.

In some embodiments, in order to reduce the weight of the optical system, a glass lens may be used to define part of or all of the lenses of the optical system 100. For example, the sixth lens 106 is a glass lens.

In an embodiment of the present application, the sixth lens 106 is defined as a glass aspheric lens, and other lenses are spherical lenses, or other lenses are plastic spherical lenses, and the sixth lens 106 is defined as a glass aspheric lens, that is, an aspheric lens made of glass material is adopted, so that the miniaturization of the optical system can be realized, and the imaging quality of the optical system can be improved.

In some embodiments, for further correction, one mirror surface or all aspheric lens surfaces of the above aspheric lens may be high-order aspheric surfaces, which satisfy the following expression:

in expression (9), z is an aspheric rotational symmetry axis, and c is a center point curvature; y is a radial coordinate, and the unit of the radial coordinate is the same as the unit length of the lens; k is a conic constant, a₁To a₈Each representing a coefficient corresponding to each radial coordinate.

In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be defined to satisfy the expression: t is_6lNot less than 6mm, wherein T_6lIs the object side surface of the sixth lens element 106 to the optical system100 on the optical axis. By limiting the distance from the sixth lens 106 to the position of the photosensitive sensor to be greater than or equal to 6mm, sufficient space can be reserved to enable the distance from the lens and/or the filter lens of the optical system to the photosensitive element (the photosensitive element of the image sensor) to be longer, so that the problems of dust entering and dirt can be effectively prevented, and the imaging quality of the optical system can be improved.

In some embodiments, as shown in fig. 2, the optical system 100 further comprises a filter optic 108, the filter optic 108 being disposed between the seventh lens 107 and the imaging surface IMA of the optical system 100. For filtering out some stray light, thereby improving the imaging quality. Illustratively, the filter lens 108 includes an infrared filter lens (IR lens), for filtering infrared light, and eliminating chromatic aberration caused by infrared light, thereby improving the imaging quality of the optical system.

In some embodiments, as shown in fig. 3, the optical system 100 includes a protective lens 109, and the protective lens 109 is disposed between the filter lens 108 and the image sensor (image plane Ima) of the optical system 100 for protecting a photosensitive element of the image sensor of the optical system.

In addition, it should be noted that, according to any of the optical systems 100 provided in the embodiments of the present application, the size of the imaging surface is greater than or equal to 1 inch, so that it is ensured that the optical system 100 can be adapted to 1 inch and image sensors greater than 1 inch.

Specific numerical configurations of the optical system are given below with reference to the drawings and tables, wherein the numbers of surfaces 1, 2, 3, 4, 6, 7, 8, and 9 in the tables respectively indicate surface numbers in the optical system, and respectively indicate 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, the filter lens 108, and the protective lens 109.

Specifically, as shown in fig. 4, two lens surfaces of the first lens 101 are a surface F1 and a surface F2, two lens surfaces of the second lens 102 are a surface F2 and a surface F3, two lens surfaces of the third lens 103 are a surface F4 and a surface F5, STO denotes a stop, two lens surfaces of the fourth lens 104 are a surface F7 and a surface F8, two lens surfaces of the fifth lens 105 are a surface F9 and a surface F10, two lens surfaces of the sixth lens 106 are a surface F11 and a surface F12, two lens surfaces of the seventh lens 107 are a surface F13 and a surface F14, two mirror surfaces of the filter lens 108 are a surface F15 and a surface F16, and two mirror surfaces of the protective lens 109 are a surface F17 and a surface F18. Where the surface numbers correspond to the numbers of the faces under Surf in table 1.

In table 1, the number of surfaces (Surf) indicates the surface of the lens, the type indicates the shape of the surface, "STANDRAD" indicates a flat surface, "evanesph" indicates an aspherical surface; radius of curvature (Radius) represents the degree of curvature of the lens surface, and can be represented by R, with smaller values of R yielding more curved lens surfaces; a separation or Thickness (thinness), which is expressed as a separation distance between lenses of an optical system on an optical axis, and a Thickness which is a center Thickness of the lenses; ND represents a refractive index of the lens; VD denotes the abbe number of the lens, also called abbe number; "Infinity" means plane; STO denotes a diaphragm surface, and IMA denotes an image side.

In Table 2, Surf represents the number of faces, K is a conic constant, and "terms of degree 4" to "degree 12" represent a₂To a₇Each representing a coefficient corresponding to each radial coordinate.

In Table 3, T_tlDistance on the optical axis from the object-side lens surface of the first lens 101 of the optical system to the image sensor of the optical system, I_mghIs one half of the diagonal of the effective pixel area of the optical system, H_FOVWhich is one-half of the field angle of the image sensor of the optical system in the diagonal direction.

Table 1 shows specific parameters of the optical system, and is referred to as example 1.

Table 1 shows the data of the respective surface parameters of the lens of the optical system of example 1

Surf	Type	Radius	Thickness	ND	VD
						OBJ	STANDARD	Infinity	Infinity
1	STANDARD	16.519	1.976	1.88	40.8
						2	STANDARD	-73.169	0.500	1.76	27.5
3	STANDARD	8.410	0.356
						4	STANDARD	10.174	1.265	2.00	30.1
5	STANDARD	23.920	3.656
						STO	STANDARD	Infinity	3.924
7	STANDARD	-10.018	0.729	1.70	30.1
						8	STANDARD	15296.290	0.295
9	STANDARD	44.643	2.270	1.88	40.8
						10	STANDARD	-13.002	0.800
11	EVENASPH	18.504	4.200	1.59	67.0
						12	EVENASPH	-26.350	2.630
13	STANDARD	-9.214	0.8	1.69	33.1
						14	STANDARD	-105	4.7
15	STANDARD	Infinity	0.8	1.52	64.2
						16	STANDARD	Infinity		0
17	STANDARD	Infinity	0.5	1.52	64.2
						18	STANDARD	Infinity	0.104
IMA	STANDARD	Infinity	Infinity

Table 2 shows data of aspherical coefficients of one surface of the optical system lens of example 1

Surf

K

Item 4

Item of 6

8 items

Item

10

12 items of degree

11

1.339

6.72E-05

-1.12E-06

1.22E-06

-3.35E-08

4.14E-10

12

-81.692

-3.18E-04

1.99E-05

-5.85E-06

1.09E-07

-8.32E-10

Table 3 relevant parameters of the optical system of example 1

T_tl	29.5mm
		I_mgH	7.93mm
H_FOV	22.5 degree

Fig. 5 and 6 show a field curvature parameter and a distortion parameter of the optical system according to the example of embodiment 1 at an infinite object distance (INF) at which an incident ray is parallel light, respectively, and as can be seen from fig. 5 and 6, the optical system has a good imaging effect and thus has a high imaging quality.

It should be noted that, according to the above-mentioned embodiment 1, the optical design can be performed after changing one of the parameters, so as to obtain a plurality of different optical systems. It should be noted that the length units referred to in the embodiments of the present application are millimeters, such as focal length, thickness, distance, and the like.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a camera according to an embodiment of the present disclosure. By using the optical system 100 provided in the embodiment of the present application, the image capturing apparatus 200 can increase the imaging area and further use a larger-sized image sensor, such as a 1-inch image sensor, and at the same time, the resolution of the image can be increased, and further the imaging quality of the image capturing apparatus 200 is improved.

Specifically, as shown in fig. 7, the photographing device 200 includes an optical system 100 and an image sensor (not shown), and the optical system 100 is disposed in an optical path between the photographic 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.

Specifically, 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, and the like.

In some embodiments, as shown in FIG. 8, the camera 200 may be a motion camera including a display 211 and a capture button 212. The optical system 100 is used to image a photographic subject 22 (such as a scene) onto an image sensor of the photographing device 200; the display screen 211 is used for displaying imaging, for example, displaying an image 220 of an object to be photographed, and the display screen 211 may be a touch display screen; the photographing key 212 is used to trigger photographing.

The imaging device in the above embodiment uses the optical system provided by the embodiment of the present application, so that the field angle of the imaging device can be increased, the imaging device is adapted to an image sensor with a large image plane, the imaging quality of the imaging device is improved, and the miniaturization of the product is realized.

An embodiment of the present application further provides a pan/tilt head, where a shooting device is mounted on the pan/tilt head, where the shooting device includes the optical system and the image sensor provided in the embodiment of the present application, and the optical system is configured in an optical path between a shooting object and the image sensor, and is configured to image the shooting object on the image sensor.

Please refer to fig. 8, fig. 8 is a schematic structural diagram of a movable platform according to an embodiment of the present application. The movable platform is provided with a shooting device to realize shooting.

As shown in fig. 8, the movable platform 300 includes a platform body 30 and a camera 200, the camera 200 is mounted on the platform body 30, the camera 200 is any one of the cameras provided in the above embodiments, that is, includes any one of the optical systems 100 provided in the above embodiments, and the optical system 100 is disposed in an optical path between a shooting object and the image sensor and is used for imaging the shooting object on the image sensor.

Illustratively, the movable platform 300 includes any one of a drone, a robot, an unmanned vehicle, and a handheld pan/tilt head.

Wherein, this aircraft includes unmanned aerial vehicle, and this unmanned aerial vehicle includes rotor type unmanned aerial vehicle, for example four rotor type unmanned aerial vehicle, six rotor type unmanned aerial vehicle, eight rotor type unmanned aerial vehicle, also can be fixed wing unmanned aerial vehicle, can also be the combination of rotor type and fixed wing unmanned aerial vehicle, does not do the injecing here.

The robot can also be called an educational robot, a Mecanum wheel omnidirectional chassis is used, a plurality of intelligent armors are arranged on the whole body, and each intelligent armor is internally provided with a hitting detection module, so that physical hitting can be rapidly detected. Simultaneously still include the diaxon cloud platform, can rotate in a flexible way, cooperation transmitter accuracy, stability, launch crystal bullet or infrared light beam in succession, cooperation trajectory light efficiency gives the user more real shooting experience.

For example, install optical system on unmanned aerial vehicle, because optical system can increase the angle of vision of camera lens, and then can shoot the scenery on a large scale, can the adaptation have the image sensor of great imaging surface, can improve shooting device's imaging quality again simultaneously, the combination of a plurality of lenses makes relative distance less moreover, and then has reduced optical system's volume, has realized miniaturization and lightness. From this, when unmanned aerial vehicle is used for taking photo by plane, can shoot better image through using this optical system, and then improved user's experience and felt.

Referring to fig. 9, fig. 9 illustrates a structure of a handheld tripod head according to an embodiment of the present application. The handheld cloud deck is provided with a shooting device to realize shooting.

As shown in fig. 9, the handheld tripod head 400 includes a holding portion 40, a tripod head body 41 and a shooting device 200, the shooting device 200 is mounted on the tripod head body 41, the shooting device 200 is any one of the shooting devices provided in the above embodiments, that is, includes any one of the optical systems 100 provided in the above embodiments, and the optical system 100 is configured in an optical path between a shooting object and the image sensor, and is used for imaging the shooting object on the image sensor.

It should be noted that the pan-tilt provided in the embodiment of the present application may be a two-axis pan-tilt or a three-axis pan-tilt, and is used to add stability to a shooting device mounted on the pan-tilt.

It should be further noted that the shooting device can be integrated with the holder body, and can also be detachably mounted on the holder body, that is, the shooting device is mounted on the holder body when the user uses the shooting device, and the shooting device is detached from the holder body when the shooting device is not used, so that the shooting device can be stored or carried.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An optical system comprising, in order from an object side to an image side:

a first lens having a positive refractive power;

a second lens having a negative focal power;

a third lens having a positive refractive power;

a fourth lens having a negative focal power;

a fifth lens having a positive refractive power;

a sixth lens having a positive refractive power;

a seventh lens having a negative power;

-2≤f₇/E_FFL≤0

2. The optical system according to claim 1, wherein the optical system satisfies the following expression:

and/or the presence of a gas in the gas,

wherein f is₁₂₃A combined focal length corresponding to the first lens, the second lens and the third lens as a combined lens, f₄₅A combined focal length corresponding to the fourth lens and the fifth lens as a combined lens，c₃₁Is the radius of curvature of the object side lens surface of the third lens element, c₃₂Is the radius of curvature of the image-side lens surface of the third lens element, c₆₁Is the radius of curvature of the object side lens surface of the sixth lens element, c₆₂The radius of curvature of the image side lens surface of the sixth lens element.

3. The optical system of claim 1, wherein the fourth lens and the fifth lens act as focusing lenses.

4. The optical system according to claim 1, wherein the optical system satisfies the following expression:

T_6lnot less than 6mm

5. The optical system according to claim 1, wherein the optical system satisfies the following expression:

F_no≥2

6. The optical system according to claim 1, wherein the optical system satisfies the following expression:

1.25≤T_tl/(I_mgH2) is less than or equal to 2.5; and/or

20°≤H_FOVLess than or equal to 28 degrees; and/or

0.1≤B_fl/T_tl≤0.32

7. The optical system according to claim 1, wherein the optical system satisfies the following expression:

19≤V₃not less than 35 and not less than 1.9N₃≤2.1

8. The optical system of claim 1, wherein the first and second lenses are cemented lenses.

9. The optical system according to claim 1, wherein the optical system comprises an iris diaphragm and a mechanical shutter, the iris diaphragm and the mechanical shutter being disposed between the third lens and the fourth lens.

10. The optical system according to claim 1, wherein the sixth lens is a glass lens, and/or the sixth lens is an aspheric lens.

11. The optical system according to any one of claims 1 to 10, characterized in that the optical system further comprises a filter lens and a protective lens, the filter lens being arranged between the seventh lens and an imaging surface of the optical system; the protective lens is arranged between the filter lens and the image sensor of the optical system and used for protecting a photosensitive element of the image sensor.

12. The optical system of claim 11, wherein the filter lens comprises an infrared filter lens.

13. A camera, characterized in that it comprises an optical system according to any one of claims 1 to 12 and an image sensor, the optical system being arranged in the optical path between a photographic object and the image sensor for imaging the photographic object on the image sensor.

14. A pan/tilt head having mounted thereon an imaging device including the optical system according to any one of claims 1 to 12 and an image sensor, the optical system being disposed in an optical path between an object and the image sensor and configured to form an image of the object on the image sensor.

15. A movable platform is characterized by comprising a platform body and a shooting device, wherein the shooting device is carried on the platform body; the photographing device includes the optical system as set forth in any one of claims 1 to 12 and an image sensor, the optical system being disposed in an optical path between a photographic subject and the image sensor for imaging the photographic subject on the image sensor.