CN214201899U

CN214201899U - Optical system, shooting device, holder and movable platform

Info

Publication number: CN214201899U
Application number: CN202023285379.5U
Authority: CN
Inventors: 牛一凡; 毛庆
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-09-14
Anticipated expiration: 2030-12-29

Abstract

The utility model discloses an optical system, shooting device and movable platform, optical system includes that it sets gradually from the thing side to picture side: the optical system includes a first lens having a negative refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, and as a focusing lens of the optical system, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, the sixth lens and the fifth lens being cemented lenses, the seventh lens having a positive refractive power. Some or all of the lenses of the optical system are aspherical lenses, and satisfy the following expression:

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

wherein G is₁₂Is the effective aperture of the image side lens surface of the first lens, G₂₂Is the effective aperture of the image side lens surface of the second lens, R₁₂Is the radius of curvature, R, of the image-side lens surface of the first lens element₂₂Is a radius of curvature of the image side lens surface of the second lens.

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, an optical system used in a photographing device must be thinned and miniaturized in a market trend, and the optical system is required to be a wide-angle lens. The incident light of the wide-angle lens in a strong light environment can bring stray light, and further the imaging definition of the optical system is influenced.

SUMMERY OF THE UTILITY MODEL

Based on this, the embodiment of the application provides an optical system, a shooting device, a cloud platform and a movable platform, and this optical system has great angle of view, reduces the influence that reduces the stray light that the incident light brought under the highlight environment simultaneously, and then can improve optical system's formation of image definition.

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 negative focal power;

a second lens having a negative focal power;

a third lens having a negative focal power and serving as a focusing lens of the optical system;

a fourth lens having a positive refractive power;

a fifth lens having a positive refractive power;

a sixth lens having a negative optical power, the sixth lens and the fifth lens being cemented lenses;

a seventh lens having positive optical power;

wherein part of or all of the lenses of the optical system are aspheric lenses, and the following expression is satisfied:

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

In an embodiment, the optical system satisfies the following expression:

t₇not less than 9 mm

Wherein, t₇The distance between the image side lens surface of the seventh lens and the imaging surface of the optical system in the optical axis direction is included.

In an embodiment, the optical system satisfies the following expression:

t₂₁t is more than or equal to 8 mm₃₁T is more than or equal to 1 mm₂₁+t₃₁＝t₂₂+t₃₂

t₂₁And t₂₂At infinite object distance and at shortest object distance, respectivelyA distance, t, from the image side lens surface of the second lens element to the object side lens surface of the third lens element in the optical axis direction₃₁And t₃₂Distances in the optical axis direction from the image side lens surface of the third lens to the object side lens surface of the fourth lens at an infinite object distance and at a shortest object distance, respectively.

In an embodiment, an aperture stop of the optical system is located between the fourth lens and the fifth lens; the optical system includes a variable aperture stop and a mechanical shutter, both of which are disposed between the fourth lens and the fifth lens.

In an embodiment, the optical system satisfies the following expression:

t₄+t₅not less than 3 mm

Wherein, t₄The distance t from the image side lens surface of the fourth lens to the aperture stop in the optical axis direction₅The distance from the aperture stop to the object side lens surface of the fifth lens in the optical axis direction.

In an embodiment, the optical system satisfies the following expression:

0.1≤(R₂₁-R₁₂)/(R₂₁+R₁₂) Less than or equal to 0.2, and/or, t₆₇Less than or equal to 0.3 mm, and/or, f₃Not less than-30 mm

Wherein R is₁₂Is the radius of curvature, R, of the image-side lens surface of the first lens element₂₁Is the radius of curvature of the object side lens surface of the second lens, t₆₇F is a distance in an optical axis direction between an image side lens surface of the sixth lens element and an object side lens surface of the seventh lens element₃Is the effective focal length of the third lens.

In one embodiment, a part of lenses or all lenses of the optical system are glass lenses.

In an embodiment, the second lens, the third lens and/or the seventh lens are glass lenses; and/or the second lens, the third lens and/or the seventh lens are aspheric lenses.

In an embodiment, the optical system satisfies the following expression:

1.5≤nd₁≤1.7，40≤vd₁less than or equal to 80; and/or the presence of a gas in the gas,

1.5≤nd₂≤1.8，40≤vd₂less than or equal to 80; and/or the presence of a gas in the gas,

1.5≤nd₃≤1.8，20≤vd₃less than or equal to 40; and/or the presence of a gas in the gas,

1.6≤nd₄≤2.0，35≤vd₄less than or equal to 80; and/or the presence of a gas in the gas,

1.5≤nd₅≤1.75，35≤vd₅less than or equal to 80; and/or the presence of a gas in the gas,

1.55≤nd₆≤1.8，35≤vd₆less than or equal to 80; and/or the presence of a gas in the gas,

1.5≤nd₇≤2.0，35≤vd₇less than or equal to 80; and/or the presence of a gas in the gas,

therein, nd₁、nd₂、nd₃、nd₄、nd₅、nd₆And nd₇The refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively; vd₁、vd₂、 vd₃、vd₄、vd₅、vd₆And vd₇The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively the dispersion coefficients.

In one embodiment, the imaging surface size of the optical system is greater than or equal to 1 inch, and the optical system can be adapted to 1 inch and greater than 1 inch image sensors.

In an embodiment, the optical system further comprises a filter lens disposed between the seventh lens and an imaging surface of the optical system.

In one embodiment, the filter lens comprises an infrared 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 embodiment of the application provides an optical system, shoot device, cloud platform and movable platform, wherein optical system can install on shooting device, this shooting device can install on cloud platform or install on movable platform's platform body, this optical system utilizes the specific parameter setting of combination of seven lenses, can realize that optical system has great angle of vision, so that the large-size image sensor of adaptation (for example 1 inch image sensor), can reduce the stray light reflection that incident light brought again under the highlight environment simultaneously, cemented lens can also improve the stability of system, and then improve 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 configuration diagram of an optical system provided in an embodiment of the present application;

FIG. 4 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. 5 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. 6 is a schematic diagram illustrating an effect of field curvature at a minimum object distance in an optical system according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram illustrating distortion effects of an optical system at a minimum object distance according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a shooting device provided in an embodiment of the present application;

FIG. 9 is a schematic structural diagram of a movable platform provided in an embodiment of the present application;

fig. 10 is a schematic structural diagram of a handheld cloud deck 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;

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 angle of view and can improve the 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 negative power, the fourth lens 104 has a positive power, the fifth lens 105 has a positive power, the sixth lens 106 has a negative power, and the seventh lens 107 has a positive power.

In the embodiment of the present application, the third lens 103 is used as a focusing lens of the optical system 100, that is, the focusing function can be realized by the third lens 103, and since only one lens is used in the optical system 100 to realize the focusing function, the weight of the focusing lens can be reduced, and further the power consumption of focusing is reduced, thereby the battery endurance of the product can be improved. The product may be, for example, a shooting device using the optical system 100, such as a camera, a handheld holder, a mobile phone, a tablet computer, and the like.

Wherein the optical system 100 satisfies the following expression:

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

in the expression (1), G₁₂Is the effective aperture of the image side lens surface of the first lens element 101, G₂₂Is the effective aperture of the image side lens surface of the second lens element 102, R₁₂Is the radius of curvature, R, of the image side lens surface of the first lens element 101₂₂Is the radius of curvature of the image side lens surface of the second lens element 102. The optical system satisfying the expression (1) can effectively reduce stray light reflection caused by incident light, and further improve the imaging definition of the optical system. Meanwhile, 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 may be referred to as "aperture" or "maximum aperture", and specifically, the ratio of the beam diameter (which may be referred to as lens diameter) of the front mirror to the focal length when each lens is fully opened, indicates the light receiving capacity of the maximum aperture of the lens.

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 so as to adapt to a large-size image sensor (for example, a 1-inch image sensor), and meanwhile, under a strong light environment, stray light reflection caused by incident light can be reduced, thereby improving the imaging quality. In addition, the focusing function is realized by using one lens, so that the battery endurance of the product can be improved.

In some embodiments, the fifth lens 105 and the sixth lens 106 may be provided as cemented lenses. In this cemented lens, the curvature radii of the image side lens surface of the fifth lens 105 and the object side lens surface of the sixth lens 106 are the same. Thereby, the miniaturization of the optical system can be further realized, and the stability of the optical system can be improved.

In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be further defined to satisfy the expression: t is t₇Not less than 9 mm, wherein t₇Is a distance in the optical axis direction from the image side lens surface of the seventh lens 107 to the imaging surface IMA of the optical system 100. By defining the distance from the seventh lens 107 to the image plane, not only the exchangeable scheme of the optical system 100 can be realized, but also the problem of dust influence on imaging can be avoided, thereby improving the imaging quality of the optical system.

It should be noted that the interchangeable scheme means that the optical system 100 can be detachably mounted on different cameras to realize the interchangeable use.

Note that the aperture stop STO of the optical system 100 is located between the fourth lens 104 and the fifth lens 105.

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

t₄+t₅not less than 3 mm (2)

In the expression (2), t₄The distance t from the image side lens surface of the fourth lens element 104 to the aperture stop STO in the optical axis direction₅The distances in the optical axis direction from the aperture stop STO to the object side lens surfaces of the fifth lens 105. Satisfying the expression (2), the optical system 100 can satisfy all the strokes in the optical, mechanical, and motor focusing processes.

In some embodiments, the optical system 100 includes an iris diaphragm and a mechanical shutter, both disposed between the fourth lens 104 and the fifth lens 105.

It should be noted that the optical system satisfying the expression (2) facilitates the arrangement of the iris diaphragm and the mechanical shutter, and the mechanical shutter can avoid the jelly effect of the optical system, thereby improving the imaging quality of the optical system.

The jelly effect is a phenomenon that an exposure time is too long, a picture is blurred, or a phenomenon that any one of "tilt", "wobble uncertainty" or "partial exposure" may occur in a photographed result.

In some embodiments, the optical system has a larger angle of view and also has a better focusing function. The optical system 100 may also be defined to satisfy the following expression:

t₂₁t is more than or equal to 8 mm₃₁T is more than or equal to 1 mm₂₁+t₃₁＝t₂₂+t₃₂ (3)

In the expression (3), t₂₁Is a 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), t₂₂Is a 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 a minimum object distance (m.o.d. object distance, for example, 0.3 m); t is t₃₁Is a distance in the optical axis direction from the image side lens surface of the third lens 103 to the object side lens surface of the fourth lens 104 at an infinite object distance (INF object distance); t is t₃₂Is a distance in the optical axis direction from the image side lens surface of the third lens 103 to the object side lens surface of the fourth lens 104 at a minimum object distance (m.o.d object distance).

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

0.1≤(R₂₁-R₁₂)/(R₂₁+R₁₂)≤0.2 (4)

in the expression (4), R₁₂Is the radius of curvature, R, of the image side lens surface of the first lens element 101₂₁Is 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 sensitivities of the first lens 101 and the second lens 102 with respect to the optical system, thereby improving the imaging quality of the optical system.

t₆₇less than or equal to 0.3 mm (5)

In the expression (5), t₆₇Is a 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 contact and lean against each other, thereby effectively improving the reflection of light in the areas corresponding to the sixth lens and the seventh lens, and thus improving the imaging quality of the optical system.

In some embodiments, miniaturization of the optical system is advantageous in order to improve the imaging quality of the optical system. The optical system 100 may also be defined to satisfy the following expression:

f₃not less than-30 mm (6)

In expression (6), f₃Is 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 is beneficial to making the focusing lens smaller, thereby facilitating the miniaturization of the optical system.

In some embodiments, some or all of the lenses of the optical system 100 are glass lenses.

For example, the second lens 102, the third lens 103 and/or the seventh lens 107 of the optical system 100 may be glass lenses. And the other lenses are non-glass lenses, such as plastic lenses. The combination of the glass lens and the plastic lens can effectively solve the temperature drift problem of the optical system, thereby improving the imaging quality of the optical system.

1.5≤nd₇≤2.0，35≤vd₇≤80； (7)

in expression (7), nd₁、nd₂、nd₃、nd₄、nd₅、nd₆And nd₇Refractive indices 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, and the seventh lens 107, respectively; vd₁、vd₂、vd₃、vd₄、vd₅、vd₆And vd₇The first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, and the seventh lens 107, respectively, and the dispersive system is also referred to as an abbe number.

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 (IR) lens for filtering out infrared light and eliminating chromatic aberration caused by the infrared light, thereby improving the imaging quality of the optical system.

In some embodiments, in order to improve the imaging quality of the optical system, some or all of the lenses of the optical system 100 may be defined as aspheric lenses.

For example, the second lens 102, the third lens 103, and/or the seventh lens 103 of the optical system 100 may be provided as aspheric lenses. For several other lenses a spherical lens is possible.

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 (8), 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 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 in conjunction with the accompanying drawings and tables, wherein the numbers of surfaces 1, 2, 3, 4, 6, 7, 8, and 9 in the tables respectively represent surface numbers in the optical system, and respectively represent 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 lens 108.

Specifically, as shown in fig. 3, the surface F1 represents an incident surface of light, and specifically at different object distances, the two lens surfaces of the first lens 101 are the surface F2 and the surface F3, the two lens surfaces of the second lens 102 are the surface F4 and the surface F5, the two lens surfaces of the third lens 103 are the surface F6 and the surface F7, the two lens surfaces of the fourth lens 104 are the surface F8 and the surface F9, STO represents a stop, the two lens surfaces of the fifth lens 105 are the surface F11 and the surface F12, the two lens surfaces of the sixth lens 106 are the surface F12 and the surface F13, the two lens surfaces of the seventh lens 107 are the surface F14 and the surface F15, and the two lens surfaces of the filter lens 108 are the surface F16 and the surface F17. Where the surface numbers correspond to the numbers of the faces under Surf in table 1.

In table 1, the number of faces represents the surface of the lens, the type represents the shape of the surface, "STANDRAD" represents a plane, "EVENASPH" represents an aspherical surface; the radius of curvature represents the degree of curvature of the lens surface, which can be represented by R, the smaller the value of R, the more curved the lens surface; 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 10" represent a₂To a₇Each representing a coefficient corresponding to each radial coordinate.

In tables 3 and 4, CT at different object distances is₀、CT₁And CT₂Value of (2), CT₀Representing object distances, in particular INF (infinite object distance) and 0.3m (minimum object distance), CT₁Denotes an axial distance between an image side lens surface of the second lens element 102 and an object side lens surface of the third lens element 103, CT₂Each represents a distance between the image side lens surface of the third lens 103 and the object side lens surface of the fourth lens 104 on the optical axis.

The optical systems corresponding to tables 1 to 3 are 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

Note that the surface 18 in table 1 is a paraxial light compensation surface of the optical system.

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

Table 3 relevant parameters of the optical system of example 1 at infinite object distance (INF)

CT0	INF
		CT1	8.51mm
CT2	1.125mm

Table 4 relevant parameters of the optical system of example 1 at minimum object distance (0.3m)

CT0	0.3m
		CT1	8.15mm
CT2	1.485mm

Fig. 4 and 5 are a field curvature parameter and a distortion parameter, respectively, of the optical system exemplified in embodiment 1 at an infinite object distance where an incident ray is parallel light; fig. 6 and 7 show a field curvature parameter and a distortion parameter at a minimum object distance (0.3m) of the optical system of example 1, respectively, and it can be seen from fig. 4, 5, 6 and 7 that the optical system has a better imaging effect and thus a higher 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.

Referring to fig. 8, fig. 8 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 simultaneously reduce the reflection of stray light caused by incident light, thereby improving the imaging quality of the image capturing apparatus 200.

Specifically, as shown in fig. 8, 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 electronic device that the photographing apparatus 200 can also perform photographing includes a mobile phone, a digital camera, a motion camera, a wearable device, or a handheld pan-tilt camera.

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 quality of the imaging device can be improved, and the miniaturization of the product can be realized.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a movable platform according to an embodiment of the present disclosure. The movable platform is provided with a shooting device to realize shooting.

As shown in fig. 9, 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 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.

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.

Referring to fig. 10, fig. 10 illustrates a structure of a handheld cloud deck 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. 10, 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 negative focal power;

a second lens having a negative focal power;

a fourth lens having a positive refractive power;

a fifth lens having a positive refractive power;

a seventh lens having positive optical power;

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

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

t₇not less than 9 mm

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

t₂₁And t₂₂Distances in the optical axis direction from the image side lens surface of the second lens to the object side lens surface of the third lens at an infinite object distance and at a shortest object distance, t₃₁And t₃₂Distances in the optical axis direction from the image side lens surface of the third lens to the object side lens surface of the fourth lens at an infinite object distance and at a shortest object distance, respectively.

4. The optical system according to claim 1, wherein an aperture stop of the optical system is located between the fourth lens and the fifth lens;

the optical system includes a variable aperture stop and a mechanical shutter, both of which are disposed between the fourth lens and the fifth lens.

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

t₄+t₅not less than 3 mm

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

Wherein R is₁₂Is the radius of curvature, R, of the image-side lens surface of the first lens element₂₁Is the radius of curvature of the object side lens surface of the second lens, t₆₇Is the sixth penetrationA distance in the optical axis direction between the image side lens surface of the mirror and the object side lens surface of the seventh lens element, f₃Is the effective focal length of the third lens.

7. The optical system according to claim 1, wherein a part of or all of the lenses of the optical system are glass lenses.

8. The optical system according to claim 7, wherein the second lens, the third lens and/or the seventh lens are glass lenses; and/or the second lens, the third lens and/or the seventh lens are aspheric lenses.

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

therein, nd₁、nd₂、nd₃、nd₄、nd₅、nd₆And nd₇The refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are respectively; vd₁、vd₂、vd₃、vd₄、vd₅、vd₆And vd₇The first lens, the second lens, the third lens and the fourth lens are respectivelyAnd the fifth lens, the sixth lens and the seventh lens.

10. The optical system according to any one of claims 1 to 9, wherein an imaging surface size of the optical system is greater than or equal to 1 inch, the optical system being adaptable to 1 inch and greater than 1 inch image sensors.

11. The optical system according to any one of claims 1 to 9, characterized in that the optical system further comprises a filter optic arranged between the seventh lens and an imaging surface of the optical system.

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

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