WO2022141120A1 - Optical system, photographing device, gimbal, and movable platform - Google Patents

Abstract

An optical system (100), a photographing device (200), a gimbal (400), and a movable platform (300). The optical system (100) comprises those which are sequentially provided from an object side to an image side: a first lens (101) having negative focal power, a second lens (102) having positive focal power, a third lens (103) having positive focal power, a fourth lens (104) having positive focal power, a fifth lens (105) having negative focal power, a sixth lens (106) having positive focal power, and a seventh lens (107) having negative focal power. The optical system (100) satisfies the following expression: 2≤T12/CT1≤8, wherein T12 is a distance between an image-side lens surface of the first lens (101) and an object-side lens surface of the second lens (102) on an optical axis, and CT1 is the thickness of the first lens (101) on the optical axis.

Description

Optical system, camera device, pan/tilt 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, a pan/tilt head, and a movable platform.

Background technique

With the development of photography technology, photographing devices (such as aerial cameras, action cameras or handheld cameras) also tend to be thinner and smaller. As a result, the optical system used in the photographing device must also be thinned and miniaturized under the market trend, and at the same time of miniaturization, the optical system is required to achieve a wide angle, so the peripheral image effect of the optical system imaging will be poor.

SUMMARY OF THE INVENTION

Based on this, the embodiments of the present application provide an optical system, a photographing device, a pan/tilt head, and a movable platform. The optical system has a larger field of view and can improve the image quality around the lens at the same time.

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 positive refractive power;

the fourth lens, with positive refractive power;

a fifth lens with negative refractive power;

the sixth lens, with positive refractive power;

the seventh lens, with negative refractive power;

The optical system satisfies the following expression:

2≤T ₁₂ /CT ₁ ≤ 8

Wherein, T ₁₂ is the distance on the optical axis from the image-side lens surface of the first lens to the object-side lens surface of the second lens, and CT ₁ is the thickness of the first lens on the optical axis.

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 pan/tilt, the pan/tilt is connected to a photographing device, and the photographing device includes the optical system and the image sensor according to any one of the embodiments of the present application, and the optical system It is arranged in the optical path between the photographed object and the image sensor, and is used to image the photographed object on the image sensor.

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

In the optical system, photographing device, pan-tilt and movable platform provided by the embodiments of the present application, the optical system can be installed on the photographing device, and the photographing device can be mounted on the pan-tilt or on the platform body of the movable platform. The optical system uses a combination of seven lenses to set specific parameters, which can realize a larger field of view of the optical system, and at the same time can improve the image quality around the lens of the optical system, thereby improving the imaging quality.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not 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;

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

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

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

FIG. 8 is a schematic structural diagram of a handheld cloud platform provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of another handheld gimbal 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, seventh lens, 108, filter optical lens;

200, a photographing device; 20, an image sensor; 22, a photographed object; 220, an image of the photographed object; 211, a display screen; 212, a photographing button;

300. Movable platform; 30. Platform body;

400, hand-held pan/tilt; 40, holding part; 41, pan/tilt body; 411, pitch axis motor; 412, roll axis motor; 413, translation axis motor.

Detailed ways

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 has a larger field of view and can improve imaging quality.

As shown in FIG. 1, the optical system 100 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106 and a The seventh lens 107 .

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

The optical system 100 satisfies the following expressions:

2≤T ₁₂ /CT ₁ ≤ 8 (1)

In Expression (1), T ₁₂ is the distance on the optical axis from the image-side lens surface of the first lens 101 to the object-side lens surface of the second lens 102 , and CT ₁ is the thickness of the first lens 101 on the optical axis . An optical system that satisfies this expression is beneficial to improve the peripheral image quality of the optical system, and the peripheral image quality can be understood as the quality of the image formed by the peripheral portion close to the lens of the optical system.

The optical system utilizes a combination of specific parameter settings of seven lenses, which can not only achieve a larger field of view of the optical system, but also improve the image quality around the lens of the optical system, thereby improving the imaging quality.

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

1.45≤nd ₁ ≤1.66, 30≤vd ₁ ≤85; and/or,

1.50≤nd ₂ ≤1.70, 19≤vd ₂ ≤24; and/or,

1.50≤nd ₃ ≤1.60, 50≤vd ₃ ≤60; and/or,

1.45≤nd ₄ ≤1.66, 30≤vd ₄ ≤85; and/or,

1.50≤nd ₅ ≤1.70, 19≤vd ₅ ≤24; and/or,

1.50≤nd ₆ ≤1.60, 50≤vd ₆ ≤60; and/or,

1.50≤nd ₇ ≤1.70, 19≤vd ₇ ≤24; (2)

In Expression (2), nd ₁ , nd ₂ , nd ₃ , nd ₄ , nd ₅ , nd ₆ , and nd ₇ are the refractive indices of the first lens 101 to the seventh lens 107 , vd ₁ , vd ₂ , vd, respectively ₃ , vd ₄ , vd ₅ , vd ₆ , and vd ₇ are the dispersion coefficients of the first lens 101 to the seventh lens 107 , which may also be called Abbe numbers. The optical system that satisfies this expression has better imaging quality by defining the refractive index of the lens and the dispersion system of the optical system.

In some embodiments, the optical system may also satisfy the following expression:

20≤(vd ₅ +vd ₆ )≤80, and/or, 20≤(vd ₆ +vd ₇ )≤80 (3)

In Expression (3), vd ₅ is the dispersion coefficient of the fifth lens 105 , vd ₆ is the dispersion coefficient of the sixth lens 106 , and vd ₇ is the dispersion coefficient of the seventh lens 107 . An optical system satisfying this expression can effectively reduce the chromatic aberration of the optical system, thereby improving the imaging quality of the optical system.

In some embodiments, part of the lenses of the optical system 100 may be glass lenses, and part of the lenses of the optical system 100 may be plastic lenses. The hybrid design of glass lens and plastic lens can ensure that the temperature drift of the optical system is small in different temperature environments, so the imaging of the optical system is clearer and more stable, and the weight of the optical system can also be reduced, thereby improving the use of the optical system. The battery life of the product of the optical system, such as a movable platform, camera or mobile phone.

Exemplarily, in the optical system 100, the first lens 101 and/or the fourth lens 104 are glass lenses.

Exemplarily, in the optical system 100, the second lens 102, the third lens 103, the fifth lens 103, the sixth lens 106 and the seventh lens 107 are plastic lenses.

Among them, the first lens 101 and the fourth lens 104 are made of glass lenses, and the second lens 102, the third lens 103, the fifth lens 103, the sixth lens 106 and the seventh lens 107 are made of plastic lenses, which can solve the problem more effectively. The temperature drift problem of the optical system, thereby improving the imaging quality of the optical system.

In some embodiments, in order to realize that the optical system has a larger angle of view and better imaging quality, the optical system 100 may also be limited to satisfy the following expressions:

_{-20≤f1≤0.0} , and/or, _{9.0≤f2≤18.0} , and/or, _10≤f3≤40 , and/or, _{1.0≤f4≤7.0} , and/or, _-20.0≤f5 ≤-1.0, and/or, 5.0≤f ₆ ≤25.0, and/or, -50.0≤f ₇ ≤-10.0 (4)

In Expression (4), f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ , and f ₇ are the first lens 101 , the second lens 102 , the third lens 103 , the fourth lens 104 , the The focal lengths of the five lenses 105, the sixth lens 106 and the seventh lens 107, and the unit of the focal length is millimeters.

It should be noted that the aperture stop STO of the optical system 100 is located between the third lens 103 and the fourth lens 104 .

In some embodiments, the optical system 100 includes an aperture disposed between the third lens 103 and the fourth lens 104, wherein the aperture may include a variable aperture. It is beneficial to increase the field of view of the optical system, and at the same time, it can better balance the exit angle of the optical system, which is beneficial to match the image sensor of the corresponding size.

In some embodiments, in order to make the optical system miniaturized and have a larger field of view, the optical system 100 can be defined to satisfy the following expression:

4.0≤T _tl /E _ffl ≤6.5 (5)

In Expression (5), T _tl is the distance on the optical axis from the object-side lens surface of the first lens 101 to the imaging surface IMA of the optical system 100 , and E _ffl is the effective focal length of the optical system 100 . Under the optical system satisfying this expression, a better balance can be achieved between compressing the volume and increasing the viewing angle, thereby realizing the miniaturization of the optical system and also having a larger field of view.

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

0.3≤f ₂ /f ₃ ≤1.0 (6)

In Expression (6), f ₂ is the focal length of the second lens 102 , and f ₃ is the focal length of the third lens 103 . An optical system that satisfies this expression can reasonably distribute the focal lengths of the second lens 102 and the third lens 103, which is conducive to balancing temperature stability, as well as balancing large and wide-angle aberrations, reducing the sensitivity of the optical system. This improves the imaging quality of the optical system.

In some embodiments, in order to increase the field of view of the optical system, the optical system 100 can also be defined to satisfy the following expression:

0.2≤(R ₁ -R ₂ )/(R ₁ +R ₂ )≤1.2 (7)

In Expression (7), R ₁ is the radius of curvature of the object-side lens surface of the first lens 101 , and R ₂ is the radius of curvature of the image-side lens surface of the first lens 101 . An optical system that satisfies this expression is beneficial to increase the field angle of the optical system, and at the same time, it can reduce the introduction of aberrations in the optical system, thereby improving the imaging quality of the optical system.

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

_2≤T56 /CT5≤8 ( ₈ )

In Expression (8), CT ₅ is the thickness on the optical axis of the fifth lens 105 , and T ₅₆ is the distance on the optical axis from the fifth lens 105 to the sixth lens 106 . An optical system that satisfies this expression is conducive to correcting the outgoing angle of the optical system, thereby facilitating imaging in the image sensor, thereby improving the imaging quality of the optical system.

In some embodiments, as shown in FIG. 2 , the optical system 100 further includes a filter lens 108 , and the filter lens 108 is disposed between the seventh lens 107 and the imaging plane IMA of the optical system 100 . Used to filter out some stray light, thereby improving image quality.

Exemplarily, for example, the filter lens 108 includes an infrared (IR) lens for filtering out infrared light to eliminate chromatic aberration caused by infrared light, thereby improving the imaging quality of the optical system.

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

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

In expression (9), z is the rotational symmetry axis of the aspheric surface, c is the curvature of the center point; y is the radial coordinate, whose unit is the same as the unit length of the lens; k is the quadratic curve constant, a ₁ to a ₈ represent respectively The coefficients corresponding to each radial coordinate.

In addition, it should also be noted that the size of the imaging surface of any optical system 100 provided in the embodiments of the present application is greater than or equal to 1/2 inch, thereby ensuring that the optical system 100 can be adapted to 1/2 inch and greater than or equal to 1/2 inch. 1/2 inch image sensor. Alternatively, the optical system can be adapted to 1/2 inch and 1/1.7 inch image sensors.

The specific numerical configuration of the optical system is given below in conjunction with the accompanying drawings and tables. The surface numbers (surf) 1, 2, 3, 4, 6, 7, 8, 9... in the table represent the surface numbers in the optical system, respectively. , respectively represent the mirror surfaces and corresponding surfaces of the first lens 101 , the second lens 102 , the third lens 103 , the fourth lens 104 , the fifth lens 105 , the sixth lens 106 , the seventh lens 107 and the filter sheet 108 .

Specifically, as shown in FIG. 3 , the two lens surfaces of the first lens 101 are the surface F1 and the surface F2 respectively, the two lens surfaces of the second lens 102 are the surface F3 and the surface F4 respectively, and the two lens surfaces of the third lens 103 The lens surfaces are respectively the surface F5 and the surface F6, the two lens surfaces of the fourth lens 104 are the surface F8 and the surface F9 respectively, the two lens surfaces of the fifth lens 105 are the surface F10 and the surface F11 respectively, the two lens surfaces of the sixth lens 106 are respectively the surface F10 and the surface F11. The lens surfaces are respectively the surface F12 and the surface F13, the two lens surfaces of the seventh lens 107 are the surface F14 and the surface F15 respectively, and the two mirror surfaces of the filter lens 108 are the surface F16 and the surface F17 respectively. The serial number of the surface corresponds to the serial number of the surface under Surf in Table 1.

In Table 1, the number of surfaces (surf) represents the surface of the lens, the type (Type) represents the shape of the surface, "STANDRAD" represents a flat surface, and "EVENASPH" represents an aspheric surface; the radius of curvature (Radius) represents the degree of curvature of the lens surface, which can be Represented by R, the smaller the R value, the more curved the lens surface; the interval or thickness (Thickness), the interval is expressed as the separation distance between the lenses of the optical system on the optical axis, and the thickness is the central thickness of the lens; ND means the refraction of the lens VD represents the dispersion coefficient of the lens, also known as the Abbe coefficient; "Infinity" represents the plane; STO represents the diaphragm surface, IMA represents the image side, and "OBJ" represents the object side.

In Table 2, Surf represents the number of faces, K is a quadratic curve constant, and "4th-order term" to "10th-order term" indicate that a ₂ to a ₇ represent the coefficients corresponding to each radial coordinate, respectively.

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

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

surf	Type	Radius	Thickness	ND	VD
OBJ	STANDARD	Infinity	Infinity
1	EVENASPH	9.633	0.450	1.497	81.6
2	EVENASPH	1.717	2.622
3	EVENASPH	-118.069	1.682	1.661	20.373
4	EVENASPH	-9.027	0.253
5	EVENASPH	-3.291	0.999	1.545	55.930
6	EVENASPH	-2.997	0.100
STO	STANDARD	Infinity	0.000
8	EVENASPH	3.774	1.399	1.497	81.560
9	EVENASPH	-2.642	0.267
10	EVENASPH	-7.573	0.350	1.669	19.442
11	EVENASPH	11.593	1.513
12	EVENASPH	7.270	0.500	1.545	55.930
13	EVENASPH	98.164	0.100
14	EVENASPH	7.052	0.740	1.661	20.373
15	EVENASPH	4.537	0.900
16	STANDARD	Infinity	0.210	1.517	64.167
17	STANDARD	Infinity	0.527
IMA	STANDARD	Infinity	_

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

surf	K	4th term	6th term	8th term	10 times	12th term	14th term	16th term
1	-53.373793	0.000552288	-1.1E-06	-1.3E-06	5.88E-08	0	0	0
2	-6.60136	-0.00352308	0.00039	6.04E-05	-0.00011	0	0	0
3	81.7	-0.01029959	-0.00126	0.003937	-0.00014	0	0	0
4	11.46251	0.006354604	-0.00327	0.00464	-0.00127	0	0	0
5	-2.142991	0.000754053	-0.01327	0.013375	0.003705	0	0	0
6	2.17322	-0.00308861	0.005796	0.001819	0.005821	0	0	0
8	-8.977196	-0.00090452	-0.00018	-0.00605	-0.00201	0	0	0
9	0.086602	0.004024369	-0.00842	0.026534	-0.00613	0	0	0
10	-12.095685	-0.00891558	-0.00229	0.005566	-0.00233	0	0	0
11	-117.024629	0.001399539	0.001455	-0.00531	0.000264	0	0	0
12	-5.426514	-0.01750379	0.000616	-0.00061	-8.3E-05	0	0	0
13	0	-0.00357233	0.000328	-0.00063	-1.4E-06	0	0	0
14	-16.460099	-0.00019911	1.97E-05	-4E-05	2.46E-06	0	0	0
15	-0.837425	-0.01044607	0.000879	-0.00052	1.33E-05	0	0	0

FIG. 4 and FIG. 5 are the field curvature parameters and distortion parameters corresponding to the optical system in Example 1, respectively. The parameters are obtained by simulating the optical system when the wavelength of incident light is 546 nm. The maximum value of the optical system in Example 1 is obtained by simulating the optical system. The field of view angle is 80 degrees. It can be seen from Figures 4 and 5 that the optical system has a better imaging effect and therefore has a 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 increase the imaging area and then use a larger-sized image sensor, such as a 1/2-inch or 1/1.7-inch image sensor, and at the same time improve the surrounding image quality, Further, the imaging quality of the photographing device 200 is improved.

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 one of the optical systems provided in the above embodiments, and the image sensor may be, for example, a CMOS sensor or a CCD sensor.

Specifically, the photographing apparatus 200 may also be an electronic device for photographing, including a mobile phone, a digital camera, a motion camera, a wearable device, or a handheld PTZ camera.

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

The photographing device in the above embodiment uses the optical system provided by the embodiment of the present application, thereby increasing the field of view of the photographing device, improving the imaging quality of the photographing device, and realizing the miniaturization of the product.

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. 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, and an unmanned vehicle.

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, if the optical system is installed on the drone, since the optical system can increase the field of view of the lens, it can shoot a wide range of scenes, and at the same time can improve the imaging quality of the shooting device, and the combination of multiple lenses makes the relative distance Smaller, thereby reducing the volume of the optical system, realizing miniaturization and lightening. Therefore, when the drone is used for aerial photography, better images can be captured by using the optical system, thereby improving the user's experience.

An embodiment of the present application further provides a pan/tilt, which may be, for example, a handheld pan/tilt, and the pan/tilt is equipped with a photographing device, and the photographing device includes the optical system according to any one of the embodiments of the present application. and an image sensor, wherein the optical system is configured in the optical path between the photographed object and the image sensor, and is used for imaging the photographed object on the image sensor.

Exemplarily, as shown in FIG. 8 , the handheld gimbal 400 includes a grip portion 40 , a gimbal body 41 and a photographing device 200 . The photographing device 200 is installed on the gimbal body 41 , and the photographing device 200 is any one provided by the above embodiments. A photographing device includes any one of the optical systems 100 provided in the above embodiments. The optical system 100 is configured in the optical path between the photographed object and the image sensor, and is used to image the photographed object on the image sensor.

The photographing device 200 and the platform body 41 shown in FIG. 8 are fixedly connected. It can be understood that the photographing device 200 and the platform body 41 can also be detachably connected, that is, the photographing device can be connected to the platform body 41 when the handheld platform is not in use. Remove from the platform body 41 .

Exemplarily, as shown in FIG. 9 , the handheld gimbal 400 includes a grip portion 40 and a gimbal body 41 . The gimbal body 41 includes a three-axis gimbal, and specifically includes a pitch axis motor 411 , a roll axis motor 412 and a pan and tilt axis motor 411 . Shaft motor 413. The platform body can be equipped with a photographing device, and the photographing device includes any of the optical systems 100 provided in the above embodiments. The optical system 100 is configured in the optical path between the photographed object and the image sensor, and is used to image the photographed object on the image sensor.

It should be noted that the pan/tilt provided in the embodiments of the present application may be a two-axis pan/tilt or a three-axis pan/tilt, which is used for stabilization of the photographing device mounted on the pan/tilt.

It should be noted that the photographing device 200 in the hand-held platform shown in FIG. 8 is integrated with the body 41 of the platform, and the photographing device in the handheld platform shown in FIG. 9 can be detachably installed on the body 41 of the platform. That is, when the user is using, the photographing device is installed on the gimbal body 41, and when not in use, the photographing device is detached from the gimbal body for storage or carrying.

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 (56)

1. 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 positive refractive power;

   the fourth lens, with positive refractive power;

   a fifth lens with negative refractive power;

   the sixth lens, with positive refractive power;

   the seventh lens, with negative refractive power;

   The optical system satisfies the following expression:

   2≤T ₁₂ /CT ₁ ≤ 8

   Wherein, T ₁₂ is the distance on the optical axis from the image-side lens surface of the first lens to the object-side lens surface of the second lens, and CT ₁ is the thickness of the first lens on the optical axis.
2. The optical system according to claim 1, wherein the optical system satisfies the following expression:

   1.45≤nd ₁ ≤1.66, 30≤vd ₁ ≤85; and/or,

   1.50≤nd ₂ ≤1.70, 19≤vd ₂ ≤24; and/or,

   1.50≤nd ₃ ≤1.60, 50≤vd ₃ ≤60; and/or,

   1.45≤nd ₄ ≤1.66, 30≤vd ₄ ≤85; and/or,

   1.50≤nd ₅ ≤1.70, 19≤vd ₅ ≤24; and/or,

   1.50≤nd ₆ ≤1.60, 50≤vd ₆ ≤60; and/or,

   1.50≤nd ₇ ≤1.70, 19≤vd ₇ ≤24;

   Wherein, nd ₁ , nd ₂ , nd ₃ , nd ₄ , nd ₅ , nd ₆ , and nd ₇ are the refractive indices of the first to seventh lenses, respectively, vd ₁ , vd ₂ , vd ₃ , vd ₄ , vd ₅ , vd ₆ , and vd ₇ are the dispersion coefficients of the first to seventh lenses, respectively.
3. The optical system according to claim 1, wherein the optical system satisfies the following expression:

   20≤(vd ₅ +vd ₆ )≤80, and/or, 20≤(vd ₆ +vd ₇ )≤80

   Wherein, vd ₅ is the dispersion coefficient of the fifth lens, vd ₆ is the dispersion coefficient of the sixth lens, and vd ₇ is the dispersion coefficient of the seventh lens.
4. The optical system according to claim 1, wherein some of the lenses of the optical system are glass lenses, and some of the lenses of the optical system are plastic lenses.
5. The optical system according to claim 4, wherein the first lens and/or the fourth lens are glass lenses.
6. The optical system according to claim 4, wherein the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses.
7. The optical system according to claim 1, wherein the optical system satisfies the following expression:

   _{-20≤f1≤0.0} , and/or, _{9.0≤f2≤18.0} , and/or, _10≤f3≤40 , and/or, _{1.0≤f4≤7.0} , and/or, _-20.0≤f5 ≤-1.0, and/or, 5.0≤f ₆ ≤25.0, and/or, -50.0≤f ₇ ≤-10.0

   Wherein, f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ and f ₇ are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the third lens, respectively. The focal length of the seven lenses, the unit of focal length is millimeters.
8. The optical system according to claim 1, wherein the optical system comprises an aperture, and the aperture is provided between the third lens and the fourth lens.
9. 8. The optical system of claim 8, wherein the aperture comprises a variable aperture.
10. The optical system according to claim 1, wherein the optical system satisfies the following expression:

    4.0≤T _tl /E _ffl ≤6.5

    Wherein, T _tl is the distance on the optical axis from the object-side lens surface of the first lens to the imaging surface of the optical system, and E _ffl is the effective focal length of the optical system.
11. The optical system according to claim 1, wherein the optical system satisfies the following expression:

    0.3≤f ₂ /f ₃ ≤1.0

    Wherein, f ₂ is the focal length of the second lens, and f ₃ is the focal length of the third lens.
12. The optical system according to claim 1, wherein the optical system satisfies the following expression:

    0.2≤(R ₁ -R ₂ )/(R ₁ +R ₂ )≤1.2

    Wherein, R ₁ is the radius of curvature of the lens surface on the object side of the first lens, and R ₂ is the radius of curvature of the lens surface on the image side of the first lens.
13. The optical system according to claim 1, wherein the optical system satisfies the following expression:

    _2≤T56 / _CT5≤8

    Wherein, CT ₅ is the thickness of the fifth lens on the optical axis, and T ₅₆ is the distance from the fifth lens to the sixth lens on the optical axis.
14. The optical system according to any one of claims 1 to 13, wherein the optical system further comprises a filter sheet, and the filter sheet is arranged between the seventh lens and the imaging surface of the optical system between.
15. 15. The optical system of claim 14, wherein the filter comprises an infrared lens.
16. The optical system according to any one of claims 1 to 13, wherein some or all of the lenses of the optical system are aspherical lenses.
17. The optical system according to any one of claims 1 to 13, wherein the size of the imaging surface of the optical system is greater than or equal to 1/2 inch, and the optical system can be adapted to 1/2 inch and greater than 1/2 inch /2-inch image sensor.
18. 18. The optical system of claim 17, wherein the optical system can be adapted to 1/2 inch and 1/1.7 inch image sensors.
19. A photographing device, characterized in that the photographing device comprises an optical system and an image sensor, the optical system is configured in the 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 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;

    The third lens has positive refractive power;

    the fourth lens, with positive refractive power;

    a fifth lens with negative refractive power;

    the sixth lens, with positive refractive power;

    the seventh lens, with negative refractive power;

    The optical system satisfies the following expression:

    2≤T ₁₂ /CT ₁ ≤ 8

    Wherein, T ₁₂ is the distance from the image-side lens surface of the first lens to the object-side lens surface of the second lens on the optical axis, and CT ₁ is the thickness of the first lens on the optical axis.
20. The photographing device according to claim 19, wherein the optical system satisfies the following expression:

    1.45≤nd ₁ ≤1.66, 30≤vd ₁ ≤85; and/or,

    1.50≤nd ₂ ≤1.70, 19≤vd ₂ ≤24; and/or,

    1.50≤nd ₃ ≤1.60, 50≤vd ₃ ≤60; and/or,

    1.45≤nd ₄ ≤1.66, 30≤vd ₄ ≤85; and/or,

    1.50≤nd ₅ ≤1.70, 19≤vd ₅ ≤24; and/or,

    1.50≤nd ₆ ≤1.60, 50≤vd ₆ ≤60; and/or,

    1.50≤nd ₇ ≤1.70, 19≤vd ₇ ≤24;

    Wherein, nd ₁ , nd ₂ , nd ₃ , nd ₄ , nd ₅ , nd ₆ , and nd ₇ are the refractive indices of the first to seventh lenses, respectively, vd ₁ , vd ₂ , vd ₃ , vd ₄ , vd ₅ , vd ₆ , and vd ₇ are the dispersion coefficients of the first to seventh lenses, respectively.
21. The photographing device according to claim 19, wherein the optical system satisfies the following expression:

    20≤(vd ₅ +vd ₆ )≤80, and/or, 20≤(vd ₆ +vd ₇ )≤80

    Wherein, vd ₅ is the dispersion coefficient of the fifth lens, vd ₆ is the dispersion coefficient of the sixth lens, and vd ₇ is the dispersion coefficient of the seventh lens.
22. The photographing device according to claim 19, wherein some of the lenses of the optical system are glass lenses, and some of the lenses of the optical system are plastic lenses.
23. The photographing device according to claim 22, wherein the first lens and/or the fourth lens are glass lenses.
24. The photographing device according to claim 22, wherein the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses.
25. The photographing device according to claim 19, wherein the optical system satisfies the following expression:

    _{-20≤f1≤0.0} , and/or, _{9.0≤f2≤18.0} , and/or, _10≤f3≤40 , and/or, _{1.0≤f4≤7.0} , and/or, _-20.0≤f5 ≤-1.0, and/or, 5.0≤f ₆ ≤25.0, and/or, -50.0≤f ₇ ≤-10.0

    Wherein, f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ and f ₇ are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the third lens, respectively. The focal length of the seven lenses, the unit of focal length is millimeters.
26. The photographing device according to claim 19, wherein the optical system comprises an aperture, and the aperture is provided between the third lens and the fourth lens.
27. The photographing device of claim 26, wherein the aperture comprises a variable aperture.
28. The photographing device according to claim 19, wherein the optical system satisfies the following expression:

    4.0≤T _tl /E _ffl ≤6.5

    Wherein, T _tl is the distance on the optical axis from the object-side lens surface of the first lens to the imaging surface of the optical system, and E _ffl is the effective focal length of the optical system.
29. The photographing device according to claim 19, wherein the optical system satisfies the following expression:

    0.3≤f ₂ /f ₃ ≤1.0

    Wherein, f ₂ is the focal length of the second lens, and f ₃ is the focal length of the third lens.
30. The photographing device according to claim 19, wherein the optical system satisfies the following expression:

    0.2≤(R ₁ -R ₂ )/(R ₁ +R ₂ )≤1.2

    Wherein, R ₁ is the radius of curvature of the lens surface on the object side of the first lens, and R ₂ is the radius of curvature of the lens surface on the image side of the first lens.
31. The photographing device according to claim 19, wherein the optical system satisfies the following expression:

    _2≤T56 / _CT5≤8

    Wherein, CT ₅ is the thickness of the fifth lens on the optical axis, and T ₅₆ is the distance from the fifth lens to the sixth lens on the optical axis.
32. The photographing device according to any one of claims 19 to 31, wherein the optical system further comprises a filter sheet, and the filter sheet is arranged between the seventh lens and the imaging surface of the optical system between.
33. The photographing device of claim 32, wherein the filter comprises an infrared lens.
34. The photographing device according to any one of claims 19 to 31, wherein some or all of the lenses of the optical system are aspherical lenses.
35. The photographing device according to any one of claims 19 to 31, wherein the size of the imaging surface of the optical system is greater than or equal to 1/2 inch, and the optical system can be adapted to 1/2 inch and greater than 1/2 inch /2-inch image sensor.
36. The photographing device of claim 35, wherein the optical system can be adapted to 1/2 inch and 1/1.7 inch image sensors.
37. A pan/tilt, characterized in that the pan/tilt is connected to a photographing device, and the photographing device comprises the optical system and the image sensor according to any one of claims 1 to 18, and the optical system is configured between the photographed object and the camera. The optical path of the image sensor is used to image the photographed object on the image sensor.
38. The pan/tilt according to claim 37, wherein the pan/tilt comprises a hand-held pan/tilt, the hand-held pan/tilt comprises a holding part and a pan/tilt body disposed on the holding part, the pan/tilt The imaging device is mounted on the main body.
39. 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;

    The third lens has positive refractive power;

    the fourth lens, with positive refractive power;

    a fifth lens with negative refractive power;

    the sixth lens, with positive refractive power;

    the seventh lens, with negative refractive power;

    The optical system satisfies the following expression:

    2≤T ₁₂ /CT ₁ ≤ 8

    Wherein, T ₁₂ is the distance from the image-side lens surface of the first lens to the object-side lens surface of the second lens on the optical axis, and CT ₁ is the thickness of the first lens on the optical axis.
40. The movable platform of claim 39, wherein the optical system satisfies the following expression:

    1.45≤nd ₁ ≤1.66, 30≤vd ₁ ≤85; and/or,

    1.50≤nd ₂ ≤1.70, 19≤vd ₂ ≤24; and/or,

    1.50≤nd ₃ ≤1.60, 50≤vd ₃ ≤60; and/or,

    1.45≤nd ₄ ≤1.66, 30≤vd ₄ ≤85; and/or,

    1.50≤nd ₅ ≤1.70, 19≤vd ₅ ≤24; and/or,

    1.50≤nd ₆ ≤1.60, 50≤vd ₆ ≤60; and/or,

    1.50≤nd ₇ ≤1.70, 19≤vd ₇ ≤24;

    Wherein, nd ₁ , nd ₂ , nd ₃ , nd ₄ , nd ₅ , nd ₆ , and nd ₇ are the refractive indices of the first to seventh lenses, respectively, vd ₁ , vd ₂ , vd ₃ , vd ₄ , vd ₅ , vd ₆ , and vd ₇ are the dispersion coefficients of the first to seventh lenses, respectively.
41. The movable platform of claim 39, wherein the optical system satisfies the following expression:

    20≤(vd ₅ +vd ₆ )≤80, and/or, 20≤(vd ₆ +vd ₇ )≤80

    Wherein, vd ₅ is the dispersion coefficient of the fifth lens, vd ₆ is the dispersion coefficient of the sixth lens, and vd ₇ is the dispersion coefficient of the seventh lens.
42. The movable platform according to claim 39, wherein part of the lenses of the optical system are glass lenses, and part of the lenses of the optical system are plastic lenses.
43. The movable platform according to claim 42, wherein the first lens and/or the fourth lens are glass lenses.
44. The movable platform of claim 42, wherein the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens are plastic lenses.
45. The movable platform of claim 39, wherein the optical system satisfies the following expression:

    _{-20≤f1≤0.0} , and/or, _{9.0≤f2≤18.0} , and/or, _10≤f3≤40 , and/or, _{1.0≤f4≤7.0} , and/or, _-20.0≤f5 ≤-1.0, and/or, 5.0≤f ₆ ≤25.0, and/or, -50.0≤f ₇ ≤-10.0

    Wherein, f ₁ , f ₂ , f ₃ , f ₄ , f ₅ , f ₆ and f ₇ are the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the third lens, respectively. The focal length of the seven lenses, the unit of focal length is millimeters.
46. 39. The movable platform of claim 39, wherein the optical system includes an aperture, the aperture being disposed between the third lens and the fourth lens.
47. 47. The movable platform of claim 46, wherein the aperture comprises a variable aperture.
48. The movable platform of claim 39, wherein the optical system satisfies the following expression:

    4.0≤T _tl /E _ffl ≤6.5

    Wherein, T _tl is the distance on the optical axis from the object-side lens surface of the first lens to the imaging surface of the optical system, and E _ffl is the effective focal length of the optical system.
49. The movable platform of claim 39, wherein the optical system satisfies the following expression:

    0.3≤f ₂ /f ₃ ≤1.0

    Wherein, f ₂ is the focal length of the second lens, and f ₃ is the focal length of the third lens.
50. The movable platform of claim 39, wherein the optical system satisfies the following expression:

    0.2≤(R ₁ -R ₂ )/(R ₁ +R ₂ )≤1.2

    Wherein, R ₁ is the radius of curvature of the lens surface on the object side of the first lens, and R ₂ is the radius of curvature of the lens surface on the image side of the first lens.
51. The movable platform of claim 39, wherein the optical system satisfies the following expression:

    _2≤T56 / _CT5≤8

    Wherein, CT ₅ is the thickness of the fifth lens on the optical axis, and T ₅₆ is the distance from the fifth lens to the sixth lens on the optical axis.
52. The movable platform according to any one of claims 39 to 51, wherein the optical system further comprises a filter sheet, and the filter sheet is arranged on the seventh lens and the imaging plane of the optical system between.
53. The movable platform of claim 52, wherein the filter comprises an infrared lens.
54. The movable platform according to any one of claims 39 to 51, wherein some or all of the lenses of the optical system are aspherical lenses.
55. The movable platform according to any one of claims 39 to 51, wherein the imaging surface size of the optical system is greater than or equal to 1/2 inch, and the optical system can be adapted to 1/2 inch and greater than 1/2 inch image sensor.
56. The movable platform of claim 55, wherein the optical system is adaptable to 1/2 inch and 1/1.7 inch image sensors.

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