WO2022036607A1

WO2022036607A1 - Optical system, photographing device, and mobile platform

Info

Publication number: WO2022036607A1
Application number: PCT/CN2020/110099
Authority: WO
Inventors: 毛庆; 牛一凡
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2022-02-24
Also published as: CN113508326A

Abstract

An optical system, a photographing device, and a mobile platform. The optical system (100) comprises, from the object side to the image side in sequence, a first lens (101) having negative refractive power, a second lens (102) having positive refractive power, a third lens (103) having negative refractive power, a fourth lens (104) having positive refractive power, a fifth lens (105) having positive refractive power, and a sixth lens (106) having negative refractive power. The image side lens surface of the third lens (103) is of an aspheric shape having at least one inflection point; both the object side lens surface and the image side lens surface of the fifth lens (105) are of an aspherical shape having at least one inflection point; both the object side lens surface and the image side lens surface of the sixth lens (106) are of an aspheric shape having at least one inflection point; and the optical system satisfies the following expression: Tr₆≥5.5 mm, Tr₆ being the minimum distance from the image side lens surface of the sixth lens (106) to an imaging surface in the optical axis direction.

Description

Optical system, photographing device and movable platform

technical field

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

Background technique

With the development of photographic technology, lenses with miniaturization, high image quality and large angle of view are more and more favored by people. Most of the existing UAV shooting devices and motion cameras and other compact cameras require lenses with ultra-high optical quality, which puts forward extremely high requirements for the lens design of the optical system, that is, the optical system is required to be miniaturized and have relatively high optical quality. Large image area and high image quality.

SUMMARY OF THE INVENTION

Based on this, the embodiments of the present application provide an optical system, a photographing device, and a movable platform, and the optical system can be miniaturized, while having a larger image surface and better imaging quality.

In a first aspect, an embodiment of the present application provides an optical system, the optical system comprising: sequentially arranged from the object side to the image side:

a first lens having negative refractive power;

a second lens having positive refractive power;

The third lens has a negative refractive power, and the image-side lens surface is an aspherical shape with at least one inflection point;

the fourth lens, with positive refractive power;

The fifth lens has a positive refractive power, and both the object-side lens surface and the image-side lens surface are aspherical shapes with at least one inflection point;

The sixth lens has negative refractive power, and both the object-side lens surface and the image-side lens surface are aspherical shapes with at least one inflection point;

The optical system satisfies the following expression:

Tr ₆ ≥5.5mm

Wherein, Tr ₆ is the minimum value of the distance in the optical axis direction from the image-side lens surface of the sixth lens to the imaging surface.

In a second aspect, an embodiment of the present application further provides a photographing device, where the photographing device includes the optical system and the image sensor according to any one of the embodiments of the present application, wherein the optical system is configured between the photographed object and the image sensor. The optical path of the image sensor is used to image the photographed object on the image sensor.

In a third aspect, the present application further provides a movable platform, the movable platform includes a platform body and a photographing device, and the photographing device is mounted on the platform body; the photographing device includes the The optical system and the image sensor according to any one of the above, wherein the optical system is arranged in an optical path between a photographed object and the image sensor, and is used for imaging the photographed object on the image sensor.

The optical system, the photographing device and the movable platform provided by the embodiments of the present application, wherein the optical system is installed on the photographing device, the photographing device can be installed on the main body of the movable platform, and the optical system uses six lenses and specific parameter settings, The product volume can be reduced, and at the same time, it has a larger image surface, is suitable for a larger size image sensor, and can also improve the imaging quality of the optical system.

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

Description of drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. For those of ordinary skill, other drawings can also be obtained from these drawings without any creative effort.

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

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

3 is a schematic configuration diagram of an optical system provided by an embodiment of the present application;

4 is a schematic diagram of the effect of field curvature of an optical system provided by an embodiment of the present application;

5 is a schematic diagram of the effect of distortion of the optical system provided by the embodiment of the present application;

6 is a schematic structural diagram of a photographing device provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a movable platform provided by an embodiment of the present application.

Description of main components and symbols:

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

200, a photographing device; 22, photographing an object; 220, photographing an image of the object; 211, a display screen; 212, a photographing button;

300, a movable platform; 30, the 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 accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts 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 features in the embodiments may be combined with each other without conflict.

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

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

Please refer to FIG. 1 , which is a schematic structural diagram of an optical system provided by an embodiment of the present application. The optical system is used to image the photographed object on the image sensor, which can reduce the volume of the product (optical system, photographing device or movable platform), and at the same time has telephotography and large zoom ratio.

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 the object side to the image side. Among them, 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.

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

The image-side lens surface of the third lens 103 is an aspherical shape with at least one inflection point, and the object-side lens surface and the image-side lens surface of the fifth lens 105 and the sixth lens 106 are all aspherical surfaces with at least one inflection point The shape of the optical system 100 can increase the field of view angle of the optical system 100 and reduce the volume of the optical system, thereby realizing that even when the volume of the optical system 100 is small, the image surface of the optical system 100 can be increased, and at the same time, the optical system 100 can be improved. The imaging quality is improved, thereby improving the imaging quality of the optical system 100 .

Wherein, the optical system 100 satisfies the following expression:

Tr ₆ ≥5.5mm (1)

In Expression (1), Tr ₆ is the minimum value of the separation distance in the optical axis direction from the image-side lens surface of the sixth lens 106 to the imaging surface IMA, where the imaging surface IMA is the surface used by the image sensor to receive light, That is, the image sensor faces the surface of the sixth lens in the figure, and the separation distance is in millimeters. When the optical system is focusing, Tr ₆ will change with the focusing process, so that the minimum value of Tr ₆ is greater than or equal to 5.5 mm, which is beneficial to reduce the influence of dust on the imaging effect, thereby improving the imaging quality of the optical system.

It should be noted that the diaphragm of the optical system 100 is located between the second lens 102 and the third lens 103 , and the diaphragm refers to an aperture diaphragm.

It should be noted that, in some embodiments of the present application, the optical system 100 includes a variable aperture and/or a mechanical shutter, wherein the variable aperture and/or mechanical shutter are configured between the second lens 102 and the third lens 103 . It is beneficial to increase the field of view of the lens of the optical system, and can better balance the exit angle of the optical system, which is beneficial to match the corresponding image sensor.

Specifically, the iris can be configured at the position of the aperture stop STO of the optical system 100, and at the same time, the use of a mechanical shutter can solve the "jelly effect" existing in the optical system, thereby further improving the imaging quality of the optical system.

Wherein, the "jelly effect" refers to the obvious deformation of the photographed object when the photographed object quickly passes through the picture formed by the optical system.

The optical system provided by the above-mentioned embodiments utilizes six lens combinations and specific parameter settings. While realizing the miniaturization of the optical system, it can also have a larger image surface to adapt to an image sensor with a larger size. For example, the above-mentioned embodiments provide The optical system can be adapted to a 4/3-inch image sensor, and can also improve the imaging quality of the optical system.

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

d ₁₂ >1.2mm (2)

In Expression (2), d ₁₂ is the separation distance from the image-side lens surface of the first lens 101 to the object-side lens surface of the second lens 102 in the optical axis direction, that is, the vertex of the image-side lens surface of the first lens 101 The separation distance from the apex of the lens surface on the object side of the second lens 102, in millimeters. The optical system that satisfies Expression (2) is beneficial to reduce the size of the second lens 102, and can also optimize the “ghost image” generated between the first lens 101 and the second lens 102, thereby improving the imaging of the optical system quality.

In some embodiments, in order to facilitate the placement of the variable aperture and the mechanical door opening, the imaging quality of the optical system can be improved at the same time. It can also be defined that the optical system 100 satisfies the following expression:

Tr ₁ +Tf ₂ ≥ 3 mm (3)

In Expression (3), Tr ₁ is the separation distance in the optical axis direction from the image-side lens surface of the first lens 101 to the diaphragm surface STO, and Tf ₂ is the diaphragm surface STO to the object-side lens of the second lens 102 The distance between faces in the direction of the optical axis, in millimeters. The optical system that satisfies the expression (3) makes the lens structure of the optical system easy to apply the variable aperture and the mechanical shutter, and facilitates the installation of the variable aperture and the mechanical shutter, thereby avoiding the "jelly effect" and improving the optical The imaging quality of the system.

In Expression (4), Tf ₁ is the separation distance from the object-side lens surface of the first lens 101 to the diaphragm surface STO in the optical axis direction, and Tr ₂ is the diaphragm surface STO to the image-side lens of the second lens 102 The distance between faces in the direction of the optical axis, in millimeters. Satisfying expression (4) is beneficial to correct the angle of the outgoing light, which can better match the requirements of the image sensor and meet the requirements of a large field of view.

0<|(R ₁₁ -R ₁₂ )/(R ₁₁ +R ₁₂ )|≤0.1, 0<|(R ₂₁ -R ₁₂ )/(R ₂₁ +R ₁₂ )|≤0.3 (5)

In Expression (5), R ₁₁ is the radius of curvature of the lens surface on the object side of the first lens 101 , R ₁₂ is the radius of curvature of the lens surface on the image side of the first lens 101 , and R ₂₁ is the radius of curvature of the lens surface on the object side of the second lens 102 The radius of curvature of the lens surface. The optical system satisfying Expression (5) is beneficial to reduce the assembly sensitivity of the first lens 101 and the second lens 102, thereby improving the imaging quality of the optical system.

In some embodiments, in order to increase the field of view of the optical system, thereby increasing the image plane of the optical system, the optical system can also be limited to satisfy the following expression:

In Expression (6), T _tl is the separation distance from the object-side lens surface of the first lens 101 to the imaging surface in the optical axis direction, and E _ffl is the effective focal length of the optical system 100, in millimeters.

In some embodiments, the image-side lens surface of the second lens is an aspherical shape with at least one inflection point, which is beneficial to reduce the size of the optical system.

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

For example, the first lens 101 is an aspheric lens, or 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 aspherical lens, or, the fifth lens 105 is an aspherical lens, or, the sixth lens 106 is an aspherical 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 aspherical lenses.

It should be noted that, the aspherical lens may specifically have one lens surface (object-side lens surface or image-side lens surface) that is an aspherical surface, or two lens surfaces (object-side lens surface and image-side lens surface) are both Aspherical.

In some embodiments, in order to improve the imaging quality of the optical system, 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 also be defined At least one glass lens is included, and/or, 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 include at least one plastic lens . Furthermore, it is realized that the optical system adopts the combination of the glass lens and the plastic lens, which can reduce the influence on the temperature drift of the optical system caused by the design of the all-plastic lens, thereby improving the imaging quality of the optical system.

Exemplarily, 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 that can define the optical system 100 include a glass lens, such as the first lens 101 is a glass lens, and the other lenses are plastic lenses.

Exemplarily, 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 that can define the optical system 100 include two glass lenses, such as the first lens The 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, the first lens 101 , the second lens 102 , the third lens 103 , the fifth lens 105 and the sixth lens The lens 106 is a plastic lens. The fourth lens 104 adopts 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 focus lenses, and the Group focus. And because the six lenses of the optical system 100 are designed with glass lenses and plastic lenses, specifically, the lenses of the optical system are driven by glass lenses and plastic lenses to perform group focusing, which not only has light focusing weight and low power consumption, but also improves the use of the optical system. It also improves the imaging quality of the optical system through cluster focusing.

In some embodiments, in order to further improve the imaging quality of the optical system, the optical system can also be defined to satisfy the following expression:

1.75≤nd ₄ ≤1.81, 45≤vd ₄ ≤50 (7)

In Expression (7), nd ₄ is the refractive index of the fourth lens 104 , and vd ₄ is the dispersion coefficient of the fourth lens 104 , that is, the Abbe number. The optical system satisfying the expression (7) is beneficial for the lens of the optical system to maintain the performance consistency under different high and low temperature environments, thereby improving the imaging quality of the optical system.

1.6≤nd ₁ ≤1.66, 20≤vd ₁ ≤24; and/or,

1.5≤nd ₂ ≤1.6, 50≤vd ₂ ≤60; and/or,

1.6≤nd ₃ ≤1.66, 20≤vd ₃ ≤24; and/or,

1.6≤nd ₅ ≤1.66, 20≤vd ₅ ≤24; and/or,

1.5≤nd ₆ ≤1.6, 50≤vd ₆ ≤60 (8)

In Expression (8), nd ₁ is the refractive index of the first lens 101 , nd ₂ is the refractive index of the second lens 102 , nd ₃ is the refractive index of the third lens 103 , and nd ₅ is the refractive index of the fifth lens 105 ratio, nd ₆ is the refractive index of the sixth lens 106, vd ₁ is the dispersion coefficient of the first lens 101, vd ₂ is the dispersion coefficient of the second lens 102, vd ₃ is the dispersion coefficient of the third lens 103, and vd ₅ is the The dispersion coefficient of the penta lens 105 , vd ₆ is the dispersion coefficient of the sixth lens 106 .

It should be noted that the size of the imaging plane of the optical system 100 provided by the above embodiments is greater than or equal to 1 inch, so a large image plane is realized. Specifically, for example, a 4/3-inch image sensor can be adapted.

In some embodiments, in order to filter out some stray light interference and further improve the imaging quality of the optical system, as shown in FIG. and between the imaging plane IMA of the optical system 100 . The filter lens 107 can be, for example, an infrared filter lens.

In some embodiments, in order to realize the miniaturization of the optical system and the optical system with a large image plane, the optical system 100 can also be defined to satisfy the following expressions:

-150<f ₁ <-90, 9.0<f ₂ <13.0, -11.2<f ₃ <-8.3, 5.0<f ₄ <7.0, 19.5<f ₅ <21.5, -13.5<f ₆ <-10.5; (9 )

In Expression (9), f is the focal length of the optical system 100, f1 is the focal length of the _first lens 101, f2 is the focal length of the _second lens 102, _f3 is the focal length of the third lens 103, and _f4 is the fourth The focal length of the lens 104, f5 is the focal length of the _fifth lens 105, f6 is the focal length of the _sixth lens 106, and the focal length is in millimeters.

In some embodiments, in order to further correct aberrations, one mirror surface or all aspherical lens surfaces of the above-mentioned aspherical lens may be a high-order aspherical surface, and the high-order aspherical surface satisfies the following expression:

In expression (10), z is the rotational symmetry axis of the aspheric surface, c is the vertex curvature; y is the radial coordinate, and its unit is the same as the lens unit length; k is the quadratic curve constant, and a ₁ to a ₈ represent each The coefficients corresponding to the radial coordinates.

The specific numerical configuration of the optical system is given below in conjunction with the accompanying drawings and tables. The surface numbers S1, S2, S3, S4, S6, S7, S8, S9, S10, S11, S12, S13, and S14 represent the surface labels in the optical system. , respectively represent the mirror surface of the first lens 101 , the mirror surface of the second lens 102 , the mirror surface of the third lens 103 , the fourth lens 104 , the fifth lens 105 , the sixth lens 106 and the filter sheet 107 .

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

Specifically, in Table 1, Surf (number of faces) represents the surface of the lens, Type (type) represents the shape of the surface, "STANDRAD" represents a plane, "EVENASPH" represents an aspherical surface; Radius (radius of curvature) represents the curved surface of the lens. The degree can be expressed by R, the smaller the R value, the more curved the lens surface; Thickness (interval or thickness), the interval is expressed as the separation distance between the lenses of the optical system on the optical axis, and the thickness is the center thickness of the lens; ND means The refractive index of the lens; VD represents the dispersion coefficient of the lens, also known as the Abbe coefficient; "Infinity" represents the plane; OBJ represents the object side, STO represents the diaphragm surface, and IMA represents the image side.

Specifically, in Table 2, Surf represents the number of faces, K is a quadratic curve constant, and "4th-order term" to "16th-order term" indicate that a ₂ to a ₈ represent the coefficients corresponding to each radial coordinate, respectively.

It should be noted that the optical systems corresponding to Table 1 and Table 2 are referred to as Example 1.

Table 1 is the surface parameter data of the lens of the optical system of Example 1

SurfSurf	TypeType	RadiusRadius	ThicknessThickness	NDND	VDVD
OBJOBJ	STANDARD STANDARD	InfinityInfinity		InfinityInfinity
11	EVENASPHEVENASPH	5.7675.767	0.59270.5927	1.661.66	20.3720.37
22	EVENASPHEVENASPH	5.0885.088	1.37291.3729
33	EVENASPHEVENASPH	7.4817.481	0.86300.8630	1.541.54	5656
44	EVENASPHEVENASPH	39.64439.644	0.81200.8120
STOSTO	STANDARDSTANDARD	InfinityInfinity	2.24562.2456
66	EVENASPHEVENASPH	-41.783-41.783	0.94470.9447	1.6351.635	23.923.9
77	EVENASPHEVENASPH	14.67414.674	0.44740.4474
88	EVENASPHEVENASPH	-23.580-23.580	3.85023.8502	1.7741.774	47.1747.17
99	EVENASPHEVENASPH	-5.541-5.541	0.17420.1742
1010	EVENASPHEVENASPH	-8.086-8.086	1.52321.5232	1.541.54	5656
1111	EVENASPHEVENASPH	-6.173-6.173	0.99690.9969
1212	EVENASPHEVENASPH	6.3186.318	1.60011.6001	1.661.66	20.3720.37
1313	EVENASPHEVENASPH	3.5053.505	4.47284.4728
1414		Infinity Infinity	11	1.521.52	64.264.2
IMAIMA		InfinityInfinity	0.9340.934

Table 2 is the optical system lens-surface aspheric coefficient data of Example 1

surfsurf	KK	4次项4th term	6次项6th term	8次项8th term	10次项10 times	12次项12th term	14次项14th term	16次项16th term
22	-1.5221-1.5221	-5.59788E-04-5.59788E-04	2.06823E-052.06823E-05	-4.37611E-05-4.37611E-05	4.06191E-064.06191E-06	-6.99622E-08-6.99622E-08	8.75055E-108.75055E-10	-5.22419E-11-5.22419E-11
33	-5.0107-5.0107	2.56793E-032.56793E-03	-2.85126E-04-2.85126E-04	1.83215E-041.83215E-04	-5.28288E-07-5.28288E-07	-2.17746E-07-2.17746E-07	7.33775E-097.33775E-09	1.50232E-091.50232E-09
44	-12.0695-12.0695	2.78492E-032.78492E-03	-3.47749E-04-3.47749E-04	2.35496E-042.35496E-04	-6.68853E-06-6.68853E-06	3.24665E-073.24665E-07	2.36949E-082.36949E-08	-4.1341E-10-4.1341E-10
55	-63.6165-63.6165	-9.02452E-04-9.02452E-04	-1.05393E-04-1.05393E-04	4.46173E-054.46173E-05	2.07142E-062.07142E-06	4.39613E-084.39613E-08	-2.67494E-09-2.67494E-09	0.00000E+000.00000E+00
77	-69.6689-69.6689	-6.59502E-03-6.59502E-03	-6.51789E-05-6.51789E-05	6.52331E-056.52331E-05	-1.25665E-05-1.25665E-05	-6.08249E-08-6.08249E-08	-2.24397E-07-2.24397E-07	2.19349E-082.19349E-08
88	-9.6006-9.6006	-4.04366E-03-4.04366E-03	1.12896E-041.12896E-04	-2.72490E-05-2.72490E-05	2.74485E-072.74485E-07	1.15535E-081.15535E-08	1.19296E-091.19296E-09	-1.98907E-11-1.98907E-11
99	14.294214.2942	-5.25800E-04-5.25800E-04	2.01484E-052.01484E-05	6.20170E-066.20170E-06	-7.34207E-08-7.34207E-08	-3.51062E-10-3.51062E-10	0.00000E+000.00000E+00	0.00000E+000.00000E+00
1010	-0.2982-0.2982	1.87692E-041.87692E-04	-1.03024E-05-1.03024E-05	7.52673E-077.52673E-07	4.31140E-084.31140E-08	1.86805E-091.86805E-09	0.00000E+000.00000E+00	0.00000E+000.00000E+00
1111	-0.2949-0.2949	5.10200E-035.10200E-03	-1.73398E-04-1.73398E-04	2.80486E-052.80486E-05	-1.62305E-07-1.62305E-07	-1.08264E-10-1.08264E-10	-1.85092E-12-1.85092E-12	-1.51075E-14-1.51075E-14
1212	-1.1879-1.1879	5.69060E-035.69060E-03	-2.04643E-04-2.04643E-04	3.26476E-053.26476E-05	-2.03718E-07-2.03718E-07	-9.65514E-11-9.65514E-11	1.90990E-121.90990E-12	-1.49428E-14-1.49428E-14
1313	-0.4485-0.4485	-1.83232E-03-1.83232E-03	-5.28373E-06-5.28373E-06	8.39501E-068.39501E-06	-2.39068E-07-2.39068E-07	3.07706E-093.07706E-09	-1.56730E-11-1.56730E-11	1.44174E-141.44174E-14
1414	-2.7557-2.7557	-8.78896E-04-8.78896E-04	3.20607E-063.20607E-06	2.05424E-062.05424E-06	-4.66169E-08-4.66169E-08	3.89490E-103.89490E-10	-9.61997E-13-9.61997E-13	-1.02262E-15-1.02262E-15

Figures 4 and 5 are the field curvature parameters and distortion parameters of the optical system of the example of Example 1 at the INF object distance, respectively. It can be seen from Figures 4 and 5 that the optical system has a better imaging effect, so it has higher imaging quality.

It should be noted that, according to Example 1 given above, one of the parameters can be changed and then optical design can be performed to obtain more different optical systems.

Please refer to FIG. 6 , which is a schematic structural diagram of a photographing apparatus provided by an embodiment of the present application. By using the optical system 100 provided by the embodiment of the present application, the photographing device 200 can realize the miniaturization of the product, and at the same time have a larger image area 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 arranged in the optical path between the photographed object 22 and the image sensor. The optical system 100 adopts any 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 photographing apparatus 200 may also be an electronic device for photographing, including a mobile phone, a digital camera, a motion camera, a wearable device, or a handheld PTZ camera.

In some embodiments, as shown in FIG. 6 , the photographing device 200 may be a motion camera, including a display screen 211 and a photographing button 212 . The optical system 100 is used to image the photographed object 22 (such as a scene) on the image sensor of the photographing device 200; the display screen 211 is used to display the imaging, such as displaying the image 220 of the object to be photographed, and the display screen 211 may specifically be a touch display screen; The shooting button 212 is used to trigger shooting.

The photographing device in the above-mentioned embodiment, because of using the optical system provided by the embodiment of the present application, can still maintain a large image surface when realizing the miniaturization of the product, so a larger-sized image sensor, such as 4/3 inch, can be used. The image sensor can improve the imaging quality of the camera at the same time.

Please refer to FIG. 7 , which is a schematic structural diagram of a movable platform provided by an embodiment of the present application. The movable platform is equipped with a photographing device to realize photographing.

As shown in FIG. 7 , the movable platform 300 includes a platform body 30 and a photographing device 200. The photographing device 200 is mounted on the platform body 30. Any one of the optical systems 100, the optical system 100 is configured in the optical path between the photographed object and the image sensor, and is used to image the photographed object on the image sensor.

Illustratively, the movable platform 300 includes any one of a drone, a robot, an unmanned vehicle, and a handheld gimbal.

Wherein, the aircraft includes an unmanned aerial vehicle, and the unmanned aerial vehicle includes a rotary-wing unmanned aerial vehicle, such as a quad-rotor unmanned aerial vehicle, a six-rotor unmanned aerial vehicle, an eight-rotored unmanned aerial vehicle, or a fixed-wing unmanned aerial vehicle. It is a combination of rotary-wing and fixed-wing drones, which is not limited here.

Among them, the robot can also be called an educational robot. It uses a Mecanum wheel omnidirectional chassis, and is equipped with multiple pieces of intelligent armor. Each intelligent armor has a built-in strike detection module, which can quickly detect physical strikes. At the same time, it also includes a two-axis gimbal, which can be rotated flexibly. With the launcher, it can accurately, steadily and continuously launch crystal bullets or infrared beams, and with ballistic light effects, it gives users a more realistic shooting experience.

For example, when the optical system is installed on the drone, when the optical system is miniaturized, it can also increase the field of view of the lens, and then can shoot a wider range of scenes, and at the same time can improve the imaging quality of the shooting device, and The combination of multiple lenses makes the relative distance smaller, thereby reducing the volume of the optical system, realizing miniaturization and portability, and improving the endurance of the UAV. Therefore, when the drone is used for aerial photography, better images can be captured by using the optical system, thereby improving the user's experience.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalents within the technical scope disclosed in the present application. Modifications or substitutions shall be covered by the protection scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

An optical system, characterized in that, the optical system comprises: sequentially arranged from the object side to the image side:

a first lens having negative refractive power;

a second lens having positive refractive power;

The third lens has a negative refractive power, and the image-side lens surface is an aspherical shape with at least one inflection point;

the fourth lens, with positive refractive power;

The fifth lens has a positive refractive power, and both the object-side lens surface and the image-side lens surface are aspherical shapes with at least one inflection point;

The sixth lens has negative refractive power, and both the object-side lens surface and the image-side lens surface are aspherical shapes with at least one inflection point;

The optical system satisfies the following expression:

Tr 6 ≥5.5mm

Wherein, Tr 6 is the minimum value of the distance in the optical axis direction from the image-side lens surface of the sixth lens to the imaging surface.
The optical system according to claim 1, wherein a diaphragm of the optical system is located between the second lens and the third lens.
The optical system according to claim 1, wherein 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.
The optical system according to claim 1, wherein 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.
The optical system according to claim 1, wherein the optical system satisfies the following expression:

d 12 >1.2mm

Wherein, d 12 is the separation distance in the optical axis direction from the image-side lens surface of the first lens to the object-side lens surface of the second lens.
The optical system according to claim 1, wherein the optical system satisfies the following expression:

Tr 1 +Tf 2 ≥3mm

Wherein, Tr 1 is the separation distance from the image-side lens surface of the first lens to the diaphragm surface in the optical axis direction Tf 2 is the optical axis direction from the diaphragm surface to the object-side lens surface of the second lens on the separation distance.
The optical system according to claim 1, wherein the optical system satisfies the following expression:

Wherein, Tf 1 is the distance between the object-side lens surface of the first lens and the diaphragm surface in the optical axis direction, and Tr 2 is the optical axis from the diaphragm surface to the image-side lens surface of the second lens. The separation distance in the direction.
The optical system according to claim 1, wherein the optical system satisfies the following expression:

0<|(R 11 -R 12 )/(R 11 +R 12 )|≤0.1

0<|(R 21 -R 12 )/(R 21 +R 12 )|≤0.3

Wherein, R 11 is the radius of curvature of the object-side lens surface of the first lens, R 12 is the curvature radius of the image-side lens surface of the first lens, and R 21 is the radius of curvature of the object-side lens surface of the second lens Radius of curvature.
The optical system according to claim 1, wherein the optical system satisfies the following expression:

Wherein, T tl is the separation distance from the object-side lens surface of the first lens to the imaging surface in the direction of the optical axis, and E ffl is the effective focal length of the optical system.
The optical system according to claim 1, wherein the image-side lens surface of the second lens is an aspherical shape having at least one inflection point.
The optical system according to claim 10, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens to the sixth lens are all aspherical lenses.
The optical system according to claim 1, wherein at least one glass lens is included among the first lens to the sixth lens, and/or at least one of the first lens to the sixth lens includes at least one glass lens A plastic lens.
The optical system according to claim 12, wherein the fourth lens is a glass lens.
The optical system according to claim 12, wherein 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.
The optical system according to claim 12, wherein the first lens to the sixth lens of the optical system are configured as focusing lenses to perform group focusing.
The optical system according to claim 1, wherein the optical system satisfies the following expression:

1.75≤nd 4 ≤1.81, 45≤vd 4 ≤50

Wherein, nd 4 is the refractive index of the fourth lens, and vd 4 is the dispersion coefficient of the fourth lens.
The optical system according to any one of claims 1 to 16, wherein the optical system satisfies the following expression:

1.6≤nd 1 ≤1.66, 20≤vd 1 ≤24; and/or,

1.5≤nd 2 ≤1.6, 50≤vd 2 ≤60; and/or,

1.6≤nd 3 ≤1.66, 20≤vd 3 ≤24; and/or,

1.6≤nd 5 ≤1.66, 20≤vd 5 ≤24; and/or,

1.5≤nd 6 ≤1.6, 50≤vd 6 ≤60

Wherein, nd 1 is the refractive index of the first lens, nd 2 is the refractive index of the second lens, nd 3 is the refractive index of the third lens, and nd 5 is the refractive index of the fifth lens, nd 6 is the refractive index of the sixth lens, vd 1 is the dispersion coefficient of the first lens, vd 2 is the dispersion coefficient of the second lens, vd 3 is the dispersion coefficient of the third lens, vd 5 is the dispersion coefficient of the fifth lens, and vd 6 is the dispersion coefficient of the sixth lens.
The optical system according to any one of claims 1 to 16, wherein the optical system comprises a variable aperture and/or a mechanical shutter, and the variable aperture and/or the mechanical shutter are arranged on the second lens and the third lens.
The optical system according to any one of claims 1 to 16, wherein the size of the imaging surface of the optical system is greater than or equal to 1 inch.
The optical system according to any one of claims 1 to 16, wherein the optical system further comprises a filter sheet, the filter sheet is arranged between the sixth lens and the imaging surface of the optical system between.
The optical system according to claim 20, wherein the filter lens comprises an infrared filter lens.
The optical system according to any one of claims 1 to 16, wherein the optical system satisfies the following expression:

-150<f 1 <-90, 9.0<f 2 <13.0, -11.2<f 3 <-8.3, 5.0<f 4 <7.0, 19.5<f 5 <21.5, -13.5<f 6 <-10.5;

where f is the focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the first lens The focal length of the four lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and the focal length is in millimeters.
A photographing device, characterized in that the photographing device includes an optical system and an image sensor, the optical system is configured in an optical path between a photographed object and the image sensor, and is used to image the photographed object on the image sensor ;

The optical system includes: sequentially arranged from the object side to the image side:

a first lens having negative refractive power;

a second lens having positive refractive power;

a third lens having a negative refractive power and an aspherical shape having at least one point of inflection;

the fourth lens, with positive refractive power;

The fifth lens has a positive refractive power, and the inflection points of the object-side lens surface and the image-side lens surface are both aspherical shapes with at least one inflection point;

The sixth lens has a negative refractive power, and the inflection points of the object-side lens surface and the image-side lens surface are both aspherical shapes with at least one inflection point;

The optical system satisfies the following expression:

Tr 6 ≥5.5mm

Wherein, Tr 6 is the minimum value of the distance in the optical axis direction from the image-side lens surface of the sixth lens to the imaging surface, and the imaging surface is the surface of the image sensor facing the sixth lens.
The photographing device according to claim 23, wherein a diaphragm of the optical system is located between the second lens and the third lens.
The photographing device according to claim 23, wherein 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.
The photographing device of claim 23, wherein 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.
The photographing device according to claim 23, wherein the optical system satisfies the following expression:

d 12 >1.2mm

Wherein, d 12 is the separation distance in the optical axis direction from the image-side lens surface of the first lens to the object-side lens surface of the second lens.
The photographing device according to claim 23, wherein the optical system satisfies the following expression:

Tr 1 +Tf 2 ≥3mm

Wherein, Tr 1 is the separation distance from the image-side lens surface of the first lens to the diaphragm surface in the direction of the optical axis,

Tf 2 is the distance from the diaphragm surface to the object-side lens surface of the second lens in the optical axis direction.
The photographing device according to claim 23, wherein the optical system satisfies the following expression:

Wherein, Tf 1 is the distance between the object-side lens surface of the first lens and the diaphragm surface in the optical axis direction, and Tr 2 is the optical axis from the diaphragm surface to the image-side lens surface of the second lens. The separation distance in the direction.
The photographing device according to claim 23, wherein the optical system satisfies the following expression:

0<|(R 11 -R 12 )/(R 11 +R 12 )|≤0.1

0<|(R 21 -R 12 )/(R 21 +R 12 )|≤0.3

Wherein, R 11 is the radius of curvature of the object-side lens surface of the first lens, R 12 is the curvature radius of the image-side lens surface of the first lens, and R 21 is the radius of curvature of the object-side lens surface of the second lens Radius of curvature.
The photographing device according to claim 23, wherein the optical system satisfies the following expression:

Wherein, T tl is the separation distance from the object-side lens surface of the first lens to the imaging surface in the direction of the optical axis, and E ffl is the effective focal length of the optical system.
The photographing device according to claim 23, wherein the image-side lens surface of the second lens is an aspherical shape with at least one inflection point.
The photographing device according to claim 32, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens to the sixth lens are all aspherical lenses.
The photographing device according to claim 23, wherein at least one glass lens is included among the first lens to the sixth lens, and/or at least one of the first lens to the sixth lens includes at least one glass lens A plastic lens.
The photographing device according to claim 34, wherein the fourth lens is a glass lens.
The photographing device according to claim 34, wherein 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.
The photographing device according to claim 34, wherein the first lens to the sixth lens of the optical system are configured as focus lenses to perform group focusing.
The photographing device according to claim 23, wherein the optical system satisfies the following expression:

1.75≤nd 4 ≤1.81, 45≤vd 4 ≤50

Wherein, nd 4 is the refractive index of the fourth lens, and vd 4 is the dispersion coefficient of the fourth lens.
The photographing device according to any one of claims 23 to 38, wherein the optical system satisfies the following expression:

1.6≤nd 1 ≤1.66, 20≤vd 1 ≤24; and/or,

1.5≤nd 2 ≤1.6, 50≤vd 2 ≤60; and/or,

1.6≤nd 3 ≤1.66, 20≤vd 3 ≤24; and/or,

1.6≤nd 5 ≤1.66, 20≤vd 5 ≤24; and/or,

1.5≤nd 6 ≤1.6, 50≤vd 6 ≤60

Wherein, nd 1 is the refractive index of the first lens, nd 2 is the refractive index of the second lens, nd 3 is the refractive index of the third lens, and nd 5 is the refractive index of the fifth lens, nd 6 is the refractive index of the sixth lens, vd 1 is the dispersion coefficient of the first lens, vd 2 is the dispersion coefficient of the second lens, vd 3 is the dispersion coefficient of the third lens, vd 5 is the dispersion coefficient of the fifth lens, and vd 6 is the dispersion coefficient of the sixth lens.
The photographing device according to any one of claims 23 to 38, wherein the optical system comprises a variable aperture and/or a mechanical shutter, and the variable aperture and/or the mechanical shutter are arranged on the second lens and the third lens.
The photographing device according to any one of claims 23 to 38, wherein the size of the imaging surface of the optical system is greater than or equal to 1 inch.
The photographing device according to any one of claims 23 to 38, wherein the optical system further comprises a filter sheet, and the filter sheet is arranged between the sixth lens and the imaging surface of the optical system between.
The photographing device according to claim 42, wherein the filter lens comprises an infrared filter lens.
The photographing device according to any one of claims 23 to 38, wherein the optical system satisfies the following expression:

-150<f 1 <-90, 9.0<f 2 <13.0, -11.2<f 3 <-8.3, 5.0<f 4 <7.0, 19.5<f 5 <21.5, -13.5<f 6 <-10.5;

where f is the focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the first lens The focal length of the four lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and the focal length is in millimeters.
A movable platform, characterized in that the movable platform includes a platform body and a photographing device, the photographing device is mounted on the platform body; the photographing device includes an optical system and an image sensor, and the optical system is configured in the optical path between the photographed object and the image sensor, for imaging the photographed object on the image sensor;

The optical system includes: sequentially arranged from the object side to the image side:

a first lens having negative refractive power;

a second lens having positive refractive power;

a third lens having a negative refractive power and an aspherical shape having at least one point of inflection;

the fourth lens, with positive refractive power;

The fifth lens has positive refractive power, and the inflection points of the object-side lens surface and the image-side lens surface are both aspherical shapes with at least one inflection point;

The sixth lens has a negative refractive power, and the inflection points of the object-side lens surface and the image-side lens surface are both aspherical shapes with at least one inflection point;

The optical system satisfies the following expression:

Tr 6 ≥5.5mm

Wherein, Tr 6 is the minimum value of the distance in the optical axis direction from the image-side lens surface of the sixth lens to the imaging surface, and the imaging surface is the surface of the image sensor facing the sixth lens.
The movable platform of claim 45, wherein the stop of the optical system is located between the second lens and the third lens.
The movable platform of claim 45, wherein 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 .
The movable platform of claim 45, wherein 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 .
The movable platform of claim 45, wherein the optical system satisfies the following expression:

d 12 >1.2mm

Wherein, d 12 is the separation distance in the optical axis direction from the image-side lens surface of the first lens to the object-side lens surface of the second lens.
The movable platform of claim 45, wherein the optical system satisfies the following expression:

Tr 1 +Tf 2 ≥3mm

Wherein, Tr 1 is the separation distance from the image-side lens surface of the first lens to the diaphragm surface in the direction of the optical axis,

Tf 2 is the distance from the diaphragm surface to the object-side lens surface of the second lens in the optical axis direction.
The movable platform of claim 45, wherein the optical system satisfies the following expression:

Wherein, Tf 1 is the distance between the object-side lens surface of the first lens and the diaphragm surface in the optical axis direction, and Tr 2 is the distance between the diaphragm surface and the image-side lens surface of the second lens in the optical axis direction The separation distance in the direction.
The movable platform of claim 45, wherein the optical system satisfies the following expression:

0<|(R 11 -R 12 )/(R 11 +R 12 )|≤0.1

0<|(R 21 -R 12 )/(R 21 +R 12 )|≤0.3

Wherein, R 11 is the radius of curvature of the object-side lens surface of the first lens, R 12 is the curvature radius of the image-side lens surface of the first lens, and R 21 is the radius of curvature of the object-side lens surface of the second lens Radius of curvature.
The movable platform of claim 45, wherein the optical system satisfies the following expression:

Wherein, T tl is the separation distance from the object-side lens surface of the first lens to the imaging surface in the direction of the optical axis, and E ffl is the effective focal length of the optical system.
The movable platform according to claim 45, wherein the image-side lens surface of the second lens is an aspherical shape with at least one inflection point.
The movable platform according to claim 54, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens to the sixth lens are all aspherical lenses.
The movable platform according to claim 55, wherein at least one glass lens is included among the first lens to the sixth lens, and/or, at least one of the first lens to the sixth lens is at least one glass lens. Includes a plastic lens.
The movable platform of claim 56, wherein the fourth lens is a glass lens.
The movable platform according to claim 56, wherein 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.
The movable platform according to claim 56, wherein the first lens to the sixth lens of the optical system are configured as focusing lenses to perform group focusing.
The movable platform of claim 45, wherein the optical system satisfies the following expression:

1.75≤nd 4 ≤1.81, 45≤vd 4 ≤50

Wherein, nd 4 is the refractive index of the fourth lens, and vd 4 is the dispersion coefficient of the fourth lens.
The movable platform according to any one of claims 45 to 60, wherein the optical system satisfies the following expression:

1.6≤nd 1 ≤1.66, 20≤vd 1 ≤24; and/or,

1.5≤nd 2 ≤1.6, 50≤vd 2 ≤60; and/or,

1.6≤nd 3 ≤1.66, 20≤vd 3 ≤24; and/or,

1.6≤nd 5 ≤1.66, 20≤vd 5 ≤24; and/or,

1.5≤nd 6 ≤1.6, 50≤vd 6 ≤60

Wherein, nd 1 is the refractive index of the first lens, nd 2 is the refractive index of the second lens, nd 3 is the refractive index of the third lens, and nd 5 is the refractive index of the fifth lens, nd 6 is the refractive index of the sixth lens, vd 1 is the dispersion coefficient of the first lens, vd 2 is the dispersion coefficient of the second lens, vd 3 is the dispersion coefficient of the third lens, vd 5 is the dispersion coefficient of the fifth lens, and vd 6 is the dispersion coefficient of the sixth lens.
The movable platform according to any one of claims 45 to 60, wherein the optical system comprises a variable aperture and/or a mechanical shutter, and the variable aperture and/or mechanical shutter are arranged on the second between the lens and the third lens.
The movable platform according to any one of claims 45 to 60, wherein the size of the imaging surface of the optical system is greater than or equal to 1 inch.
The movable platform according to any one of claims 45 to 60, wherein the optical system further comprises a filter sheet, and the filter sheet is arranged on the sixth lens and the imaging plane of the optical system between.
The movable platform of claim 64, wherein the filter lens comprises an infrared filter lens.
The movable platform according to any one of claims 45 to 60, wherein the optical system satisfies the following expression:

-150<f 1 <-90, 9.0<f 2 <13.0, -11.2<f 3 <-8.3, 5.0<f 4 <7.0, 19.5<f 5 <21.5, -13.5<f 6 <-10.5;

where f is the focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the first lens The focal length of the four lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and the focal length is in millimeters.
The movable platform of claim 45, wherein the movable platform comprises an unmanned aerial vehicle, a robot, or a handheld gimbal.