CN216434516U

CN216434516U - Wide-angle video transmission lens matched with liquid lens

Info

Publication number: CN216434516U
Application number: CN202123273152.3U
Authority: CN
Inventors: 黄波; 潘锐乔
Original assignee: Xiamen Leading Optics Co Ltd
Current assignee: Xiamen Leading Optics Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-05-03
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a wide angle video-information transmission camera lens of collocation liquid camera lens, including first to third lens, liquid camera lens, diaphragm, fourth to the eighth lens that sets gradually, first lens utensil negative diopter, second lens utensil negative diopter, third lens utensil positive diopter, fourth lens utensil positive diopter, fifth lens utensil positive diopter, sixth lens utensil positive diopter, seventh lens utensil negative diopter, eighth lens utensil positive diopter. The wide-angle video transmission lens matched with the liquid lens adopts the 3G5P optical structure design, and is matched with the liquid lens, so that the 4K imaging of the 2.5-0.05 m full object distance section is realized; meanwhile, an F/2.4 light transmission design and a liquid lens middle-arranged design are adopted, so that the use area of a light transmission area of the liquid lens is reduced, and the focusing error of the aperture edge of the liquid lens and the influence of gravity on the image quality of the liquid lens are effectively reduced; by adopting a plurality of plastic lenses, the temperature drift is small, and the imaging index parameters of the lens can keep consistency.

Description

Wide-angle video transmission lens matched with liquid lens

Technical Field

The utility model relates to an optical lens technical field particularly, relates to a wide angle video-signal transmission camera lens of collocation liquid camera lens.

Background

With the continuous progress of science and technology and the continuous development of society, in recent years, the optical imaging lens is also rapidly developed and widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring and the like, so that the requirement on the optical imaging lens is higher and higher.

The existing video transmission lens mainly has the following problems: the clear aperture is not large, the resolution is not enough, and the temperature drift characteristic is not enough; inability to image efficiently at close object distances; most of the glass spherical surface designs are adopted, the tolerance range of the cold machining process of the glass spherical surface is large, and the consistency of indexes such as image quality, distortion and the like of a lens is difficult to ensure; some video transmission lenses made of plastic non-spherical materials are easy to lose focus when working at high temperature.

In view of this, the present inventors have invented a wide-angle video transmission lens with a liquid lens.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a wide angle video-information transmission camera lens of collocation liquid camera lens that resolution ratio is high, color reducing nature is good, the distortion is little, the temperature floats for a short time.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a wide-angle video transmission lens matched with a liquid lens comprises a first lens, a second lens, a third lens, the liquid lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along an optical axis from an object side to an image side, wherein the first lens to the eighth lens respectively comprise an object side face which faces the object side and enables imaging light to pass and an image side face which faces the image side and enables the imaging light to pass;

the first lens has negative diopter, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens has negative diopter, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;

the third lens has positive diopter, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;

the fourth lens has positive diopter, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;

the fifth lens has positive diopter, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;

the sixth lens has positive diopter, and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface;

the seventh lens has negative diopter, and the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a convex surface;

the eighth lens element has a positive refractive power, and an object-side surface of the eighth lens element is a convex surface and an image-side surface of the eighth lens element is a concave surface.

Further, the lens satisfies: <1.4 after 0.8< | f6/f, <1.4 after 0.8< | f7/f, <1.4 after 0.8< | f8/f,

wherein f6, f7 and f8 are focal length values of the sixth lens, the seventh lens and the eighth lens respectively, and f rear is a combined focal length of a rear group consisting of the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens.

Furthermore, the second lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens are all plastic even-order aspheric lenses, and the first lens, the third lens and the sixth lens are all glass spherical lenses.

Further, the ratio of the light transmission diameter of the diaphragm to the effective light transmission aperture of the liquid lens is less than 0.6.

Further, the lens focal length f satisfies: f is more than or equal to 3.2mm and less than or equal to 3.4 mm.

Further, the maximum light transmittance F/#ofthe lens is 2.4.

Further, the total optical length TTL of the lens satisfies: TTL <31 mm.

After the technical scheme is adopted, the utility model has the advantages of as follows:

the wide-angle video transmission lens matched with the liquid lens adopts the 3G5P optical structure design, and is matched with the liquid lens, so that the 4K imaging of the 2.5-0.05 m full object distance section is realized; meanwhile, an F/2.4 light transmission design and a liquid lens middle-arranged design are adopted, so that the use area of a light transmission area of the liquid lens is reduced, and the focusing error of the aperture edge of the liquid lens and the influence of the liquid lens on the image quality due to gravity are effectively reduced; by adopting a plurality of plastic lenses and reasonably matching the focal power of the plastic lenses, the lens has clear picture without defocusing when used in an environment of-20-80 ℃; in addition, a plurality of plastic high-order aspheric lenses are used, so that the imaging index parameters of the lens can keep consistent.

Drawings

Fig. 1 is a light path diagram of embodiment 1 of the present invention;

fig. 2 is a graph of MTF curve of a lens with an object distance of 0.05m in visible light according to embodiment 1 of the present invention;

fig. 3 is a graph of MTF curve of a lens with an object distance of 1m in visible light according to embodiment 1 of the present invention;

fig. 4 is a graph of MTF curve of a lens with an object distance of 2.5m in visible light according to embodiment 1 of the present invention;

fig. 5 is a vertical axis chromatic aberration curve diagram of the lens in embodiment 1 of the present invention under visible light;

fig. 6 is a graph showing the curvature of field and distortion of the lens under visible light in embodiment 1 of the present invention;

fig. 7 is a light path diagram of embodiment 2 of the present invention;

fig. 8 is a graph of MTF of a lens with an object distance of 0.05m in visible light according to embodiment 2 of the present invention;

fig. 9 is a graph of MTF curve of a lens with an object distance of 1m in visible light according to embodiment 2 of the present invention;

fig. 10 is a graph of MTF curve of a lens with an object distance of 2.5m in visible light according to embodiment 2 of the present invention;

fig. 11 is a vertical axis chromatic aberration curve diagram of the lens in embodiment 2 of the present invention under visible light;

fig. 12 is a graph showing curvature of field and distortion of a lens in visible light according to embodiment 2 of the present invention;

fig. 13 is a light path diagram according to embodiment 3 of the present invention;

fig. 14 is a graph of MTF curve of a lens with an object distance of 0.05m in visible light according to embodiment 3 of the present invention;

fig. 15 is a graph of MTF curve of a lens with an object distance of 1m in the visible light according to embodiment 3 of the present invention;

fig. 16 is a graph of MTF curve of a lens with an object distance of 2.5m in the visible light according to embodiment 3 of the present invention;

fig. 17 is a vertical axis chromatic aberration curve diagram of the lens in embodiment 3 of the present invention under visible light;

fig. 18 is a graph showing curvature of field and distortion of the lens in the visible light according to embodiment 3 of the present invention.

Description of reference numerals:

1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. a diaphragm; 10. protecting glass; 11. a liquid lens.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are all based on the orientation or position relationship shown in the drawings, and are only for convenience of description and simplification of the present invention, but do not indicate or imply that the device or element of the present invention must have a specific orientation, and thus, should not be construed as limiting the present invention.

As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.

The utility model discloses a wide-angle video transmission lens matched with a liquid lens 11, which comprises a first lens 1, a second lens 2, a third lens 3, a liquid lens 11, a diaphragm 9, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and an eighth lens 8 which are arranged in sequence from an object side to an image side along an optical axis, wherein the first lens 1 to the eighth lens 8 respectively comprise an object side face facing the object side and enabling imaging light to pass and an image side face facing the image side and enabling the imaging light to pass;

the first lens 1 has negative diopter, and the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;

the second lens element 2 has negative diopter, and the object-side surface of the second lens element 2 is a convex surface and the image-side surface is a concave surface;

the third lens 3 has positive diopter, and the object side surface of the third lens 3 is a convex surface, and the image side surface is a convex surface;

the fourth lens 4 has positive diopter, and the object side surface of the fourth lens 4 is a concave surface, and the image side surface is a convex surface;

the fifth lens 5 has positive diopter, and the object side surface of the fifth lens 5 is a concave surface, and the image side surface is a convex surface;

the sixth lens element 6 has a positive refractive power, and an object-side surface of the sixth lens element 6 is a convex surface and an image-side surface thereof is a convex surface;

the seventh lens element 7 has negative refractive power, and the object-side surface of the seventh lens element 7 is a concave surface and the image-side surface is a convex surface;

the eighth lens element 8 has a positive refractive power, and the object-side surface of the eighth lens element 8 is a convex surface and the image-side surface is a concave surface.

The liquid lens 11 is preferably an Optoture liquid lens 11 of type EL 12-30, 4K resolution imaging of the lens from an object distance of 2.5m to an object distance of 0.05m in a full object distance range can be realized by reasonable optical design by utilizing the optical path compensation capability of the liquid lens 11, the optical MTF is greater than 0.2 in each object distance range of 200lp/mm, and the lens resolution is high.

The ratio of the light transmission diameter of the diaphragm 9 to the effective light transmission aperture of the liquid lens 11 is less than 0.6. The maximum clear light F/#ofthe lens is 2.4, and meanwhile, the liquid lens 11 in the lens adopts a design arranged in the middle (middle design), so that the focusing error of the aperture edge of the liquid lens 11 and the image quality influence of liquid caused by gravity sag are effectively reduced.

The second lens 2, the fourth lens 4, the fifth lens 5, the seventh lens 7 and the eighth lens 8 are all plastic high-order even-order aspheric lenses, and the first lens 1, the third lens 3 and the sixth lens 6 are all glass spherical lenses. The lens adopts five plastic high-order even-order aspheric lenses, and the focal power value of the plastic lenses is reasonably matched, so that when the lens is used in an environment of-20-80 ℃, the image is clear without defocusing, and the optical athermalization is realized. Meanwhile, the lens uses a plurality of plastic high-order aspheric lenses, and due to the effective processing technology and tolerance control capability of the plastic aspheric surfaces, the imaging index parameters of the lens can effectively keep consistency.

The lens satisfies the following conditions: the focal length of the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 is respectively the focal length of the sixth lens 6, the seventh lens 7 and the eighth lens 8 after 0.8< | f6/f, | <1.4 after 0.8< | f7/f, | <1.4 after 0.8< | f8/f, | <1.4 after 0.8< | f7/f and f, wherein f6, f7 and f8 are the combined focal length of the rear group consisting of the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the eighth lens 8 after f. The last three lenses of the lens close to the image side are equally distributed with the focal power value of the rear group, so that the incident and emergent angles of light rays on the surface of the lens are reduced, and the tolerance sensitivity of the optical group is weakened.

The lens adopts the structural design of eight lenses and a liquid lens 11, and realizes the wide-angle video transmission lens focusing from a large object distance range of 2.5m-0.05m by reasonably matching the focal power, the core thickness and the relative distance between the lenses.

The focal length f of the lens satisfies: f is more than or equal to 3.2mm and less than or equal to 3.4mm, and the total optical length TTL meets the following requirements: TTL <31mm, maximum FOV around 89 degrees, and optical distortion less than 2%.

The mini infrared imaging lens of the present invention will be described in detail with reference to the following embodiments.

Example 1

Referring to fig. 1, the present invention discloses a wide-angle video transmission lens with a liquid lens 11, including a first lens element 1, a second lens element 2, a third lens element 3, a liquid lens 11, a diaphragm 9, a fourth lens element 4, a fifth lens element 5, a sixth lens element 6, a seventh lens element 7, and an eighth lens element 8, which are sequentially disposed along an optical axis from an object side to an image side, wherein each of the first lens element 1 to the eighth lens element 8 includes an object side surface facing the object side and allowing an imaging light to pass therethrough, and an image side surface facing the image side and allowing the imaging light to pass therethrough;

The detailed optical data of this embodiment are shown in Table 1-1.

Table 1-1 detailed optical data for example 1

Wherein the detailed data of the variable parameters in Table 1-1 are shown in Table 1-2.

Table 1-2 table 1-1 details of the variable parameters

Object distance	S1	2500	1000	50
					Value of surface radius	C1	-2500	Infinity	81.984

In this embodiment, the second lens 2, the fourth lens 4, the fifth lens 5, the seventh lens 7, and the eighth lens 8 are all plastic high-order even-order aspheric lenses, and the first lens 1, the third lens 3, and the sixth lens 6 are all glass spherical lenses. And both surfaces of the aspheric lens are aspheric surfaces. The equation for the surface curve of an aspherical lens is expressed as follows:

wherein the content of the first and second substances,

z: depth of the aspheric surface (the vertical distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the optical axis of the aspheric surface);

c: the curvature of the aspheric vertex (the vertex curvature);

k: cone coefficient (Conic Constant);

radial distance (radial distance);

r_n: normalized radius (normalysis radius (NRADIUS));

u：r/r_n；

a_m: mth order Q^conCoefficient (is the m)^thQ^con coefficient)；

Q_m ^con: mth order Q^conPolynomial (the m)^thQ^con polynomial)。

The aspherical surface data in this embodiment are shown in tables 1 to 3.

Tables 1-3 aspheric data for example 1

Noodle sequence number

K

A4

A6

A8

A10

A12

A14

3

-4.19

4.89E-03

-4.52E-04

2.33E-05

-9.72E-07

2.61E-08

-3.12E-10

4

-0.73

1.86E-04

-5.82E-04

2.54E-05

-1.68E-06

8.87E-08

-2.26E-09

17

33.78

-7.99E-03

-2.50E-04

-3.87E-05

-1.04E-04

-9.38E-06

1.04E-05

18

13.69

-1.51E-02

-4.10E-04

-1.69E-04

-1.10E-05

2.00E-06

1.82E-06

19

6.87

-1.76E-02

-5.66E-04

-1.12E-03

3.55E-04

-9.61E-06

4.95E-06

20

0.09

-3.51E-04

-3.45E-04

-4.76E-04

1.89E-04

1.23E-06

-1.90E-07

23

-2.50

6.50E-03

-2.45E-03

3.12E-04

-9.66E-06

4.13E-07

-2.17E-08

24

-3.35

4.07E-03

-1.93E-04

-3.47E-05

6.84E-06

-7.31E-08

1.27E-08

25

-0.66

-1.06E-02

-1.26E-04

2.47E-05

5.80E-07

3.32E-08

-6.00E-09

26

10.26

-6.22E-03

-7.08E-04

1.26E-04

-9.22E-06

2.13E-07

-1.20E-09

In this embodiment, please refer to fig. 2, fig. 3, and fig. 4 for MTF graphs of the lens under visible light when the object distances are 0.05m, 1m, and 2.5m, respectively, as can be seen from the graphs, when the spatial frequency of the lens reaches 200lp/mm, the MTF values are substantially greater than 0.3, the imaging quality is good, and the resolution of the lens is high. Please refer to fig. 5, which shows that the vertical chromatic aberration of the lens under visible light has small chromatic aberration, high correction capability of the vertical chromatic aberration of the lens, and high image color reducibility. Please refer to fig. 6 for the field curvature and distortion diagram of the lens under visible light, it can be seen from the diagram that the optical distortion of the system is less than 2%, the distortion is small, and the image quality is effectively improved.

Example 2

As shown in fig. 7, this embodiment is different from embodiment 1 mainly in the optical parameters such as the curvature radius of each lens surface and the lens thickness.

The detailed optical data of this embodiment is shown in Table 2-1.

Table 2-1 detailed optical data for example 2

Wherein the detailed data of the variable parameters in Table 2-1 are shown in Table 2-2.

Table 2-2 table 2-1 details of the variable parameters

Object distance	S1	2500	1000	50
					Value of surface radius	C1	-1000	Infinity	89.3011

In this embodiment, the second lens 2, the fourth lens 4, the fifth lens 5, the seventh lens 7, and the eighth lens 8 are all plastic high-order even-order aspheric lenses, and the first lens 1, the third lens 3, and the sixth lens 6 are all glass spherical lenses. And both surfaces of the aspheric lens are aspheric surfaces. Aspherical surface data in this example are shown in tables 2 to 3.

Tables 2-3 aspheric data for example 2

Number of noodles

K

A4

A6

A8

A10

A12

A14

3

-3.96

1.81E-03

-3.27E-04

1.84E-05

-5.50E-07

8.65E-09

-5.87E-11

4

-0.79

-3.81E-03

-5.05E-04

5.28E-05

-2.82E-06

7.70E-08

-9.19E-10

17

8.09

-1.08E-03

2.43E-04

-3.09E-05

-3.24E-05

-2.39E-07

2.54E-06

18

21.02

-2.33E-03

5.17E-04

-2.06E-04

2.02E-05

1.37E-06

-1.70E-07

19

-33.00

-5.87E-03

-3.42E-04

-1.98E-04

-1.66E-05

2.88E-06

-4.11E-07

20

-30.04

-8.13E-03

1.49E-03

-4.12E-04

3.81E-05

-4.57E-07

-1.17E-07

23

-1.28

1.28E-02

2.95E-04

-3.03E-04

3.12E-05

-6.97E-07

-3.53E-08

24

14.27

2.99E-03

1.77E-03

-2.09E-04

7.84E-06

2.98E-07

-2.17E-08

25

-5.47

-3.99E-03

-4.16E-04

7.96E-05

3.40E-06

-7.98E-07

2.22E-08

26

41.01

7.40E-04

-1.57E-03

2.70E-04

-2.29E-05

1.27E-06

-4.04E-08

In this embodiment, please refer to fig. 8, 9, and 10 for MTF graphs of the lens under visible light when the object distances are 0.05m, 1m, and 2.5m, respectively, and it can be seen from the graphs that when the spatial frequency of the lens reaches 200lp/mm, the MTF values are substantially greater than 0.3, the imaging quality is good, and the resolution of the lens is high. Please refer to fig. 11, which shows that the vertical chromatic aberration of the lens under visible light has small chromatic aberration, high correction capability of the vertical chromatic aberration of the lens, and high color reproducibility of the image. Please refer to fig. 12 for the field curvature and distortion diagram of the lens under visible light, it can be seen from the diagram that the optical distortion of the system is less than 2%, the distortion is small, and the image quality is effectively improved.

Example 3

As shown in fig. 13, this embodiment is different from embodiment 1 mainly in the optical parameters such as the curvature radius of each lens surface and the lens thickness.

The detailed optical data of this embodiment is shown in Table 3-1.

Table 3-1 detailed optical data for example 3

Wherein the detailed data of the variable parameters in Table 3-1 are shown in Table 3-2.

Table 3-2 table 3-1 details of the variable parameters

Object distance	S1	2500	1000	50
					Value of surface radius	C1	-2439.02	Infinity	84.4326

In this embodiment, the second lens 2, the fourth lens 4, the fifth lens 5, the seventh lens 7, and the eighth lens 8 are all plastic high-order even-order aspheric lenses, and the first lens 1, the third lens 3, and the sixth lens 6 are all glass spherical lenses. And both surfaces of the aspheric lens are aspheric surfaces. The aspherical surface data in this embodiment is shown in tables 3 to 3.

Tables 3-3 aspheric data for example 3

In this embodiment, please refer to fig. 14, fig. 15, and fig. 16 for MTF graphs of the lens under visible light when the object distances are 0.05m, 1m, and 2.5m, respectively, and it can be seen from the graphs that when the spatial frequency of the lens reaches 200lp/mm, the MTF values are substantially greater than 0.3, the imaging quality is good, and the resolution of the lens is high. Please refer to fig. 17, which shows that the vertical chromatic aberration of the lens under visible light has small chromatic aberration, high correction capability of the vertical chromatic aberration of the lens, and high color reproducibility of the image. Please refer to fig. 18 for the field curvature and distortion diagram of the lens under visible light, it can be seen from the diagram that the optical distortion of the system is less than 2%, the distortion is small, and the image quality is effectively improved.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a wide angle video transmission camera lens of collocation liquid lens which characterized in that: the imaging lens comprises a first lens, a second lens, a third lens, a liquid lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged along an optical axis from an object side to an image side, wherein the first lens to the eighth lens respectively comprise an object side surface facing the object side and allowing imaging light rays to pass and an image side surface facing the image side and allowing the imaging light rays to pass;

2. The wide-angle video transmission lens matched with a liquid lens as claimed in claim 1, wherein: the lens satisfies the following conditions: <1.4 after 0.8< | f6/f, <1.4 after 0.8< | f7/f, <1.4 after 0.8< | f8/f,

3. The wide-angle video transmission lens matched with a liquid lens as claimed in claim 1, wherein: the second lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens are all plastic even-order aspheric lenses, and the first lens, the third lens and the sixth lens are all glass spherical lenses.

4. The wide-angle video transmission lens matched with a liquid lens as claimed in claim 1, wherein: and the ratio of the light transmission diameter of the diaphragm to the effective light transmission aperture of the liquid lens is less than 0.6.

5. The wide-angle video transmission lens with liquid lens of claim 1, wherein: the focal length f of the lens satisfies: f is more than or equal to 3.2mm and less than or equal to 3.4 mm.

6. The wide-angle video transmission lens matched with a liquid lens as claimed in claim 1, wherein: the maximum light transmission F/#ofthe lens is 2.4.

7. The wide-angle video transmission lens matched with a liquid lens as claimed in claim 1, wherein: the total optical length TTL of the lens meets the following requirements: TTL <31 mm.