CN212781468U

CN212781468U - Optical system, imaging device, and movable platform

Info

Publication number: CN212781468U
Application number: CN202021754408.5U
Authority: CN
Inventors: 毛庆; 牛一凡
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2021-03-23
Anticipated expiration: 2030-08-19

Abstract

The utility model discloses an optical system, shoot device and movable platform, wherein, optical system includes the first lens that has the negative focal power that sets gradually from the thing side to picture side, the second lens that has positive focal power, the third lens that has negative focal power, the fourth lens that has positive focal power, the fifth lens that has positive focal power and the sixth lens that has negative focal power, third lens picture side lens face is the aspheric surface shape that has at least one inflection point, fifth lens thing side lens face and picture side lens face are the aspheric surface shape that has at least one inflection point, sixth lens thing side lens face and picture side lens face are the aspheric surface shape that has at least one inflection point; the optical system satisfies the following expression: tr₆Greater than or equal to 5.5 mm, Tr₆Is the minimum value of the distance separating the image side lens surface of the sixth lens element from the imaging surface in the optical axis direction.

Description

Optical system, imaging device, and movable platform

Technical Field

The present application relates to the field of optical technologies, and in particular, to an optical system, a photographing device using the optical system, and a movable platform.

Background

With the development of the photographing technology, a miniaturized, high-quality and large-angle lens is more and more favored by people. The existing cameras with the same size and the same compactness as the shooting device and the motion camera of the unmanned aerial vehicle mostly need lenses with ultrahigh optical quality, so that extremely high requirements are put on the design of the lenses of an optical system, namely the optical system is required to be miniaturized and have a larger image surface, and higher imaging quality is required.

SUMMERY OF THE UTILITY MODEL

Based on this, the embodiment of the application provides an optical system, a shooting device and a movable platform, and the optical system can realize miniaturization and has a larger image plane and better imaging quality.

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 positive refractive power;

a third lens having negative refractive power, wherein the image side lens surface has an aspheric shape having at least one inflection point;

a fourth lens having a positive refractive power;

a fifth lens having positive refractive power, wherein the object side lens surface and the image side lens surface are both aspheric shapes having at least one inflection point;

a sixth lens having negative refractive power, wherein the object side lens surface and the image side lens surface are both aspheric shapes having at least one inflection point;

the optical system satisfies the following expression:

Tr₆not less than 5.5 mm

Wherein, Tr₆The minimum value of the distance between the image side lens surface of the sixth lens and an imaging surface in the optical axis direction is obtained; the first lens to the sixth lens include at least one aspherical lens, and the first lens to the sixth lens include at least one glass lens.

In the optical system of the present application, the stop of the optical system is located between the second lens and the third lens.

In the optical system of the present application, the object side lens surface of the fifth lens has a concave object side surface, and the image side lens surface of the fifth lens has a convex image side surface.

In the optical system of the present application, the object side lens surface of the fifth lens has a convex object side surface, and the image side lens surface of the fifth lens has a concave image side surface.

In the optical system of the present application, the optical system satisfies the following expression:

d₁₂>1.2 mm

Wherein d is₁₂The distance between the image side lens surface of the first lens and the object side lens surface of the second lens is in the optical axis direction.

Tr₁+Tf₂not less than 3 mm

Wherein, Tr₁The distance between the image side lens surface and the diaphragm surface of the first lens in the optical axis direction is Tf₂The distance between the diaphragm surface and the object side lens surface of the second lens in the optical axis direction is set.

wherein, Tf₁The distance, Tr, between the object side lens surface and the stop surface of the first lens in the optical axis direction₂The distance between the diaphragm surface and the image side lens surface of the second lens in the optical axis direction is defined.

0<|(R₁₁-R₁₂)/(R₁₁+R₁₂)|≤0.1

0<|(R₂₁-R₁₂)/(R₂₁+R₁₂)|≤0.3

wherein R is₁₁Is the radius of curvature, R, of the object side lens surface of the first lens₁₂Is the radius of curvature, R, of the image-side lens surface of the first lens element₂₁Is the curvature radius of the object side lens surface of the second lens.

wherein, T_tlThe distance between the object side lens surface of the first lens and the image sensor in the optical axis direction, the optical system is used for imaging the shooting object on the imaging surface, E_fflIs the effective focal length of the optical system.

In the optical system of the present application, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all aspheric lenses.

In the optical system of the present application, at least one of the first lens to the sixth lens includes a plastic lens.

In the optical system of the present application, the fourth lens is a glass lens.

In the optical system of the present application, the fourth lens is a glass lens, and the first lens, the second lens, the third lens, the fifth lens and the sixth lens are plastic lenses.

In the optical system of the present application, the first to sixth lenses of the optical system are configured as focusing lenses, and perform entire group focusing.

1.75≤nd₄≤1.81，45≤vd₄≤50

therein, nd₄Is the refractive index of the fourth lens, vd₄Is the abbe number of the fourth lens.

1.6≤nd₁≤1.66，20≤vd₁less than or equal to 24; and/or the presence of a gas in the gas,

1.5≤nd₂≤1.6，50≤vd₂less than or equal to 60; and/or the presence of a gas in the gas,

1.6≤nd₃≤1.66，20≤vd₃less than or equal to 24; and/or the presence of a gas in the gas,

1.6≤nd₅≤1.66，20≤vd₅less than or equal to 24; and/or the presence of a gas in the gas,

1.5≤nd₆≤1.6，50≤vd₆≤60

therein, nd₁Is the refractive index of the first lens, nd₂Is the refractive index, nd, of the second lens₃Is the refractive index, nd, of the third lens₅Is a refractive index, nd, of the fifth lens₆Is the refractive index of the sixth lens, vd₁Is the Abbe number of the first lens, vd₂Is the Abbe number of the second lens, vd₃Is the Abbe number of the third lens, vd₅Is the Abbe number of the fifth lens, vd₆Is the abbe number of the sixth lens.

In the optical system of the present application, the optical system includes an iris diaphragm and/or a mechanical shutter disposed between the second lens and the third lens.

In the optical system of the present application, an imaging plane size of the optical system is greater than or equal to 1 inch.

In the optical system of the present application, the optical system further includes a filter lens disposed between the sixth lens and an imaging surface of the optical system.

In the optical system of the present application, the filter lens includes an infrared filter lens.

-150<f₁<-90，9.0<f₂<13.0，-11.2<f₃<-8.3，5.0<f₄<7.0，19.5<f₅<21.5， -13.5<f₆<-10.5；

where f is the focal length of the optical system, f₁Is the focal length, f, of the first lens₂Is the focal length of the second lens, f₃Is the focal length of the third lens, f₄Is the focal length of the fourth lens, f₅Is the focal length of the fifth lens, f₆Is the focal length of the sixth lens, the focal length being in millimeters.

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 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 and the movable platform provided by the embodiment of the application have the advantages that the optical system is installed on the shooting device, the shooting device can be installed on the main body of the movable platform, the optical system utilizes six lenses and specific parameter setting, the product volume can be reduced, meanwhile, the image surface is large, the optical system is suitable for large-size image sensors, and the imaging quality of the optical system can be improved.

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 according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram illustrating distortion effects of an optical system provided by an embodiment of the present application;

fig. 6 is a schematic structural diagram of a shooting device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a movable platform according to an embodiment of the present disclosure.

Description of the main elements and symbols:

100. an optical system; 101. a first lens; 102. a second lens; 103. a third lens; 104. a fourth lens; 105. a fifth lens; 106. a sixth lens; 107. a filter lens;

200. a photographing device; 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.

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 is used for imaging a shot object on the image sensor, can reduce the volume of a product (the optical system, the shooting device or a movable platform), and has long-distance shooting and larger zoom magnification.

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, and a sixth lens 106, which are arranged in order from an object side to an image side. Among them, a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, and a sixth lens 106.

The first lens 101 has negative power; the second lens 102 has positive optical power; the third lens 103 has negative refractive power, and the image side lens surface of the third lens 103 is aspheric in shape with at least one inflection point; the fourth lens 104 has positive optical power; the fifth lens 105 has positive optical power, and both the object side lens surface and the image side lens surface of the fifth lens 105 are aspheric in shape with at least one inflection point; the sixth lens 106 has negative refractive power, and the object-side lens surface and the image-side lens surface of the sixth lens 106 are both aspheric in shape with at least one inflection point.

The image side lens surface of the third lens 103 is aspheric with at least one inflection point, and the object side lens surfaces and the image side lens surfaces of the fifth lens 105 and the sixth lens 106 are aspheric with at least one inflection point, so that the field angle of the optical system 100 can be increased, and the volume of the optical system can be reduced, thereby increasing the image plane of the optical system 100 when the volume of the optical system 100 is small, improving the imaging balance of the optical system 100, and further improving the imaging quality of the optical system 100.

Wherein the optical system 100 satisfies the following expression:

Tr₆not less than 5.5 mm (1)

In the expression (1), Tr₆Is the minimum value of the distance in the optical axis direction between the image side lens surface of the sixth lens 106 and the imaging surface IMA, where the imaging surface IMA is the surface of the image sensor for receiving light, that is, the surface of the image sensor facing the sixth lens in the figure, and the distance is in millimeters. Tr is a measure for focusing of the optical system₆Will change with the focusing process, let Tr₆The minimum value of the optical system is more than or equal to 5.5 millimeters, which is beneficial to reducing the influence of dust on the imaging effect, and further improves the imaging quality of the optical system.

Note that, the stop of the optical system 100 is located between the second lens 102 and the third lens 103, and the stop is an aperture stop.

It is noted that in some embodiments of the present application, the optical system 100 includes an iris diaphragm and/or a mechanical shutter, wherein the iris diaphragm and/or the mechanical shutter is disposed between the second lens 102 and the third lens 103. The field angle of the lens of the optical system can be increased, the emergent angle of the optical system can be balanced better, and the corresponding image sensor can be matched.

Specifically, the variable aperture can be arranged at the position of the aperture stop STO of the optical system 100, while the "jelly effect" existing in the optical system can be solved by using the mechanical shutter, whereby the imaging quality of the optical system can be further improved.

The "jelly effect" means that a subject is significantly deformed when the subject passes through a screen formed by an optical system at a high speed.

The optical system provided by the above embodiment utilizes six lens combinations and specific parameter settings, and can have a larger image plane to adapt to an image sensor with a larger size while realizing miniaturization of the optical system, for example, the optical system provided by the above embodiment can adapt to an 4/3-inch image sensor, and can also improve the imaging quality of the optical system.

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:

d₁₂>1.2 mm (2)

In the expression (2), d₁₂The distance between the vertex of the image side lens surface of the first lens 101 and the vertex of the object side lens surface of the second lens 102 in the optical axis direction, that is, the distance between the vertex of the image side lens surface of the first lens 101 and the vertex of the object side lens surface of the second lens 102, is expressed in millimeters. The optical system satisfying the expression (2) is advantageous in that the size of the second lens 102 is small, and the "ghost" generated between the first lens 101 and the second lens 102 can be optimized, thereby improving the imaging quality of the optical system.

In some embodiments, the iris diaphragm and the mechanical door can be conveniently placed, and the imaging quality of the optical system can be improved. The optical system 100 may also be defined to satisfy the following expression:

Tr₁+Tf₂not less than 3 mm (3)

In the expression (3), Tr₁Is a distance, Tf, from the image side lens surface of the first lens 101 to the stop surface STO in the optical axis direction₂The distance between the stop surface STO and the object side lens surface of the second lens 102 in the optical axis direction is in millimeters. The optical system satisfying the expression (3) enables the lens structure of the optical system to be convenient for applying the iris diaphragm and the mechanical shutter and facilitating the installation of the iris diaphragm and the mechanical shutter, thereby avoiding the 'jelly effect' and further improving the imaging quality of the optical system.

in expression (4), Tf₁The distance, Tr, from the object side lens surface to the stop surface STO of the first lens 101 in the optical axis direction₂The unit is a distance of separation in the optical axis direction from the stop surface STO to the image side lens surface of the second lens 102. Satisfying the expression (4) is advantageous for correcting the angle of the emergent ray, and can better match the requirements of the image sensor and satisfy the requirements of a large field angle.

0<|(R₁₁-R₁₂)/(R₁₁+R₁₂)|≤0.1，0<|(R₂₁-R₁₂)/(R₂₁+R₁₂)|≤0.3 (5)

in the expression (5), R₁₁Radius of curvature, R, of the object-side lens surface of the first lens element 101₁₂Is 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. Satisfy the expressionThe optical system of formula (5) is beneficial to reducing the assembly sensitivity of the first lens 101 and the second lens 102, and further improves the imaging quality of the optical system.

In some embodiments, in order to increase the field angle of the optical system and further increase the image plane of the optical system, the optical system may be further defined to satisfy the following expression:

in expression (6), T_tlIs the distance between the object side lens surface of the first lens 101 and the image plane in the optical axis direction, E_fflIn millimeters, is the effective focal length of the optical system 100.

In some embodiments, the image side lens surface of the second lens is aspheric in shape with at least one inflection point, which is advantageous for reducing the size of the optical system.

In some embodiments, in order to further improve the imaging quality of the optical system, at least one of the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, and the sixth lens 106 of the optical system 100 may be defined to include an aspheric lens.

For example, the first lens 101 is an aspheric lens, or the second lens 102 is an aspheric lens, or the third lens 103 is an aspheric lens, or the fourth lens 104 is an aspheric lens, or the fifth lens 105 is an aspheric lens, or the sixth lens 106 is an aspheric lens.

For another example, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105 to the sixth lens 106 are all aspheric lenses.

Specifically, one lens surface (the object side lens surface or the image side lens surface) of the aspheric lens may be aspheric, or both lens surfaces (the object side lens surface and the image side lens surface) may be aspheric.

In some embodiments, in order to improve the imaging quality of the optical system, it may be further defined that at least one of the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105 and the sixth lens 106 of the optical system 100 includes a glass lens, and/or at least one of the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105 and the sixth lens 106 of the optical system 100 includes a plastic lens. And then realize that optical system adopts glass lens and plastic lens combination, can reduce to adopt the plastic lens to carry out the influence that the design can produce to optical system's temperature drift, and then improved optical system's imaging quality.

Illustratively, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105 and the sixth lens 106 of the optical system 100 may be defined to include a glass lens, specifically, for example, the first lens 101 is a glass lens, and the other lenses are plastic lenses.

Illustratively, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105 and the sixth lens 106 of the optical system 100 may be defined to include two glass lenses, specifically, for example, the first lens 101 and the fourth lens 104 are glass lenses, and the other lenses are plastic lenses.

In some embodiments, the fourth lens 104 of the optical system 100 is a glass lens; alternatively, the fourth lens 104 is a glass lens, and the first lens 101, the second lens 102, the third lens 103, the fifth lens 105, and the sixth lens 106 are plastic lenses. The fourth lens 104 is a glass lens, which can further improve the temperature drift of the optical system, thereby improving the imaging quality of the optical system.

In some embodiments, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, and the sixth lens 106 to the sixth lens of the optical system 100 are configured as focusing lenses for performing the entire group focusing. In addition, because the six lenses of the optical system 100 are designed by mixing the glass lens and the plastic lens, and particularly, the lens of the optical system adopts the driving glass lens and the plastic lens to perform the whole group focusing, the focusing weight is light, the power consumption is low, the cruising ability of a product using the optical system is improved, and the imaging quality of the optical system is also improved through the whole group focusing.

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

1.75≤nd₄≤1.81，45≤vd₄≤50 (7)

in expression (7), nd₄Refractive index of the fourth lens 104, vd₄Is the abbe number, i.e., abbe number, of the fourth lens 104. The optical system satisfying the expression (7) is beneficial to keeping performance consistency of the lens of the optical system under different high and low temperature environments, and further improves the imaging quality of the optical system.

1.5≤nd₆≤1.6，50≤vd₆≤60 (8)

in expression (8), nd₁Is the refractive index, nd, of the first lens 101₂Is the refractive index, nd, of the second lens 102₃Is the refractive index, nd, of the third lens 103₅Is a refractive index, nd, of the fifth lens 105₆Refractive index of the sixth lens 106, vd₁Is the Abbe number of the first lens 101, vd₂Is the Abbe number, vd, of the second lens 102₃Is the Abbe number of the third lens 103, vd₅Is the Abbe number, vd, of the fifth lens 105₆The abbe number of the sixth lens 106.

It should be noted that the above-described embodiment provides the optical system 100 with an imaging plane size of 1 inch or more, and thus realizes a large image plane. Specifically, an 4/3 inch image sensor, for example, may be fitted.

In some embodiments, in order to filter some parasitic light interference and further improve the imaging quality of the optical system, as shown in fig. 2, the optical system 100 may further include a filter lens 107, and the filter lens 107 is disposed between the sixth lens 106 and the imaging plane IMA of the optical system 100. The filter lens 107 may be, for example, an infrared filter lens.

In some embodiments, to achieve miniaturization of the optical system and the optical system having a large image plane, the optical system 100 may be further defined to satisfy the following expression:

-150<f₁<-90，9.0<f₂<13.0，-11.2<f₃<-8.3，5.0<f₄<7.0，19.5<f₅<21.5，

-13.5<f₆<-10.5； (9)

in expression (9), f is the focal length of the optical system 100, f₁Is the focal length, f, of the first lens 101₂Is the focal length, f, of the second lens 102₃Is the focal length, f, of the third lens 103₄Is the focal length, f, of the fourth lens 104₅Is the focal length, f, of the fifth lens 105₆Is the focal length of the sixth lens 106 in millimeters.

In some embodiments, to further correct aberrations, one mirror surface or all aspheric lens surfaces of the above aspheric lens may be high-order aspheric surfaces that satisfy the following expression:

in expression (10), z is an aspherical rotational symmetry axis, and c is a vertex 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.

Specific numerical configurations of the optical system are given below with reference to the drawings and tables, and the numbers of surfaces S1, S2, S3, S4, S6, S7, S8, S9, S10, S11, S12, S13, and S14 indicate surface numbers in the optical system, and respectively indicate the mirror surface of the first lens 101, the mirror surface of the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, and the mirror surface of the filter lens 107.

Specifically, as shown in fig. 3, the two lens surfaces of the first lens 101 are surface S1 and surface S2, the two lens surfaces of the second lens 102 are surface S3 and surfaces S4 and STO, respectively, and represent stop, the two lens surfaces of the third lens 103 are surface S6 and surface S7, the two lens surfaces of the fourth lens 104 are surface S8 and surface S9, the two lens surfaces of the fifth lens 105 are surface S10 and surface S11, the two lens surfaces of the sixth lens 106 are surface S12 and surface S13, respectively, and the mirror surface of the filter lens 107 is surface S14.

Specifically, in table 1, Surf (number of faces) represents a surface of a lens, Type represents a shape of the surface, "STANDRAD" represents a plane, "EVENASPH" represents an aspherical surface; radius (Radius of curvature) represents the degree of curvature of the lens surface, and can be represented by R, with the smaller the value of R, the more curved the lens surface; thickness (separation or Thickness), the separation being expressed as the separation distance between lenses of an optical system on the optical axis, the Thickness being the central 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; OBJ denotes the object side, STO the diaphragm surface, IMA the image side.

Specifically, in table 2, Surf represents the number of faces, K is a conic constant, and "4-order term" to "16-order term" represent a₂To a₈Each representing a coefficient corresponding to each radial coordinate.

The optical systems shown in tables 1 and 2 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

Surf	Type	Radius	Thickness	ND	VD
						OBJ	STANDARD	Infinity	Infinity
1	EVENASPH	5.767	0.5927	1.66	20.37
						2	EVENASPH	5.088	1.3729
3	EVENASPH	7.481	0.8630	1.54	56
						4	EVENASPH	39.644	0.8120
STO	STANDARD	Infinity	2.2456
						6	EVENASPH	-41.783	0.9447	1.635	23.9
7	EVENASPH	14.674	0.4474
						8	EVENASPH	-23.580	3.8502	1.774	47.17
9	EVENASPH	-5.541	0.1742
						10	EVENASPH	-8.086	1.5232	1.54	56
11	EVENASPH	-6.173	0.9969
						12	EVENASPH	6.318	1.6001	1.66	20.37
13	EVENASPH	3.505	4.4728
						14		Infinity	1	1.52	64.2
IMA		Infinity	0.934

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

14 items

16 items

2

-1.5221

-5.59788E-04

2.06823E-05

-4.37611E-05

4.06191E-06

-6.99622E-08

8.75055E-10

-5.22419E-11

3

-5.0107

2.56793E-03

-2.85126E-04

1.83215E-04

-5.28288E-07

-2.17746E-07

7.33775E-09

1.50232E-09

4

-12.0695

2.78492E-03

-3.47749E-04

2.35496E-04

-6.68853E-06

3.24665E-07

2.36949E-08

-4.1341E-10

5

-63.6165

-9.02452E-04

-1.05393E-04

4.46173E-05

2.07142E-06

4.39613E-08

-2.67494E-09

0.00000E+00

7

-69.6689

-6.59502E-03

-6.51789E-05

6.52331E-05

-1.25665E-05

-6.08249E-08

-2.24397E-07

2.19349E-08

8

-9.6006

-4.04366E-03

1.12896E-04

-2.72490E-05

2.74485E-07

1.15535E-08

1.19296E-09

-1.98907E-11

9

14.2942

-5.25800E-04

2.01484E-05

6.20170E-06

-7.34207E-08

-3.51062E-10

0.00000E+00

10

-0.2982

1.87692E-04

-1.03024E-05

7.52673E-07

4.31140E-08

1.86805E-09

0.00000E+00

11

-0.2949

5.10200E-03

-1.73398E-04

2.80486E-05

-1.62305E-07

-1.08264E-10

-1.85092E-12

-1.51075E-14

12

-1.1879

5.69060E-03

-2.04643E-04

3.26476E-05

-2.03718E-07

-9.65514E-11

1.90990E-12

-1.49428E-14

13

-0.4485

-1.83232E-03

-5.28373E-06

8.39501E-06

-2.39068E-07

3.07706E-09

-1.56730E-11

1.44174E-14

14

-2.7557

-8.78896E-04

3.20607E-06

2.05424E-06

-4.66169E-08

3.89490E-10

-9.61997E-13

-1.02262E-15

Fig. 4 and 5 show the field curvature parameter and the distortion parameter of the optical system of the example of embodiment 1 at the INF object distance, respectively, and it can be seen from fig. 4 and 5 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. 6, fig. 6 is a schematic structural diagram of a camera according to an embodiment of the present disclosure. By using the optical system 100 provided by the embodiment of the application, the photographing device 200 can realize product miniaturization, and has a larger image plane and better imaging quality.

Specifically, as shown in fig. 6, 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, wherein the imaging surface of the optical system is the surface of the image sensor facing the sixth lens.

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. 6, 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.

In the photographing device in the above embodiment, due to the use of the optical system provided by the embodiment of the present application, when the miniaturization of the product is realized, a large image plane can still be maintained, so that a larger-sized image sensor, such as an 4/3-inch image sensor, can be adopted, and meanwhile, the imaging quality of the photographing device can be improved.

Referring to fig. 7, fig. 7 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. 7, 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 is when possessing the miniaturization, still 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, has improved unmanned aerial vehicle's duration. 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.

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, characterized in that the optical system comprises:

a first lens having a negative focal power;

a second lens having a positive refractive power;

a fourth lens having a positive refractive power;

the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in order from an object side to an image side, the first lens to the sixth lens at least comprise one aspheric lens, and the first lens to the sixth lens at least comprise one glass lens;

the optical system satisfies the following expression:

Tr₆not less than 5.5 mm

Wherein, Tr₆The distance between the image side lens surface of the sixth lens and the imaging surface is the minimum value in the optical axis direction.

2. The optical system of claim 1, wherein a stop of the optical system is located between the second lens and the third lens.

3. The optical system according to claim 1, wherein an object-side lens surface of the fifth lens has a concave object-side surface, and an image-side lens surface of the fifth lens has a convex image-side surface; and/or the presence of a gas in the gas,

the object side lens surface of the fifth lens has a convex object side surface, and the image side lens surface of the fifth lens has a concave image side surface.

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

d₁₂>1.2 mm, and/or,

wherein, T_tlThe distance between the object side lens surface of the first lens and the imaging surface in the optical axis direction, E_fflIs the effective focal length of the optical system,

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

Tr₁+Tf₂not less than 3 mm, and/or,

wherein, Tr₁The distance between the image side lens surface and the diaphragm surface of the first lens in the optical axis direction is Tf₂The distance between the diaphragm surface and the object side lens surface of the second lens in the optical axis direction is set; wherein, Tf₁The distance, Tr, between the object side lens surface and the stop surface of the first lens in the optical axis direction₂Is said lightA distance between the aperture surface and the image side lens surface of the second lens in the optical axis direction.

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

0<|(R₁₁-R₁₂)/(R₁₁+R₁₂)|≤0.1

0<|(R₂₁-R₁₂)/(R₂₁+R₁₂)|≤0.3

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

1.75≤nd₄≤1.81，45≤vd₄less than or equal to 50; and/or the presence of a gas in the gas,

1.5≤nd₆≤1.6，50≤vd₆≤60

therein, nd₁Is the refractive index of the first lens, nd₂Is the refractive index, nd, of the second lens₃Is the refractive index, nd, of the third lens₄Is a refractive index, nd, of the fourth lens₅Is a refractive index, nd, of the fifth lens₆Is the refractive index of the sixth lens, vd₁Is the Abbe number of the first lens, vd₂Is the Abbe number of the second lens, vd₃Is the Abbe number of the third lens, vd₄Is the Abbe number of the fourth lens, vd₅Is the Abbe number of the fifth lens, vd₆Is the abbe number of the sixth lens.

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

-150<f₁<-90，9.0<f₂<13.0，-11.2<f₃<-8.3，5.0<f₄<7.0，19.5<f₅<21.5，-13.5<f₆<-10.5；

where f is the focal length of the optical system, f₁Is the focal length, f, of the first lens₂Is the focal length of the second lens, f₃Is the focal length of the third lens, f₄Is the focal length of the fourth lens, f₅Is the focal length of the fifth lens, f₆Is the focal length of the sixth lens, which is millimeter.

9. The optical system according to claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all aspheric lenses.

10. The optical system of claim 1, wherein the fourth lens is a glass lens; and/or the presence of a gas in the gas,

the first lens, the second lens, the third lens, the fifth lens and the sixth lens are plastic lenses.

11. The optical system according to any one of claims 1 to 10, wherein the first to sixth lenses of the optical system are provided with focusing lenses for performing a group focusing; and/or the presence of a gas in the gas,

the size of an imaging surface of the optical system is greater than or equal to 1 inch.

12. An optical system according to any one of claims 1 to 10, characterized in that the optical system comprises an iris diaphragm and/or a mechanical shutter arranged between the second and third lenses.

13. The optical system according to any one of claims 1 to 10, characterized in that the optical system further comprises a filter lens arranged between the sixth lens and an imaging surface of the optical system.

14. A photographing device comprising the optical system according to any one of claims 1 to 13 and an image sensor, wherein the optical system is disposed in an optical path between a photographic object and the image sensor, and is configured to image the photographic object onto the image sensor, and the imaging surface is a surface of the image sensor facing the sixth lens.

15. A movable platform, characterized in that the movable platform comprises a platform body and the photographing device according to claim 14, the photographing device being mounted on the platform body; the shooting device comprises an 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, and the imaging surface is a surface of the image sensor, which faces the sixth lens.