CN212433493U

CN212433493U - Optical imaging lens matched with liquid lens

Info

Publication number: CN212433493U
Application number: CN202022010429.2U
Authority: CN
Inventors: 郑毅; 黄翔邦; 李可
Original assignee: Xiamen Leading Optics Co Ltd
Current assignee: Xiamen Leading Optics Co Ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-01-29
Anticipated expiration: 2030-09-15

Abstract

The utility model relates to a camera lens technical field. The utility model discloses an optical imaging lens of collocation liquid camera lens includes first lens to fourth lens from the thing side to picture side in proper order along an optical axis, the diaphragm, liquid camera lens, fifth lens to seventh lens, first lens and second lens all have positive refractive index and the object side is the convex surface, third lens utensil negative refractive index and the image side is the concave surface, the fourth lens is the convex plane or convex-concave lens of utensil positive refractive index, fifth lens utensil negative refractive index and object side are concave surface or plane, the sixth lens is the meniscus lens of utensil negative refractive index, seventh lens utensil positive refractive index and object side are the convex surface. The utility model has the advantages of compromise resolution ratio, depth of field, magnification isoparametric, work object distance range is wide, and resolution ratio is higher, and imaging quality is good, and it is big to lead to light, and the production yield is high.

Description

Optical imaging lens matched with liquid lens

Technical Field

The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens of collocation liquid camera lens.

Background

With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, and the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, machine vision systems and the like, so that the requirements on the optical imaging lenses are higher and higher.

However, the optical imaging lens matched with the liquid lens for iris recognition in the market at present has many defects, such as the light passing value does not reach the ideal light passing value required by the application; the relative illumination is limited by the liquid lens and is poor; parameters such as resolution, depth of field, magnification and the like cannot be taken into consideration, the identification range is limited, and an object to be detected can be identified when the object is located in a specified small range; poor productivity yield and the like, which have not been able to meet the increasing demands, and improvements are urgently needed.

Disclosure of Invention

An object of the utility model is to provide an optical imaging lens of collocation liquid camera lens is used for solving the technical problem that the above-mentioned exists.

In order to achieve the above object, the utility model adopts the following technical scheme: an optical imaging lens matched with a liquid lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, the liquid lens, a fifth lens, a fourth lens, a fifth lens and a seventh lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light;

the first lens element has positive refractive index, and the object-side surface of the first lens element is convex;

the second lens has positive refractive index, and the object side surface of the second lens is a convex surface;

the third lens element with negative refractive index has a concave image-side surface;

the fourth lens element with positive refractive index has a convex object-side surface and a flat or concave image-side surface;

the fifth lens element has negative refractive index, and the object-side surface of the fifth lens element is concave or planar;

the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface;

the seventh lens element has positive refractive index; the object side surface of the seventh lens is a convex surface.

The fourth lens element is disposed between the fifth lens element and the sixth lens element, and has a positive refractive index, a concave object-side surface, and a convex image-side surface.

Furthermore, the refractive index of the first lens is larger than that of the second lens, the refractive index of the third lens is larger than that of the second lens and the fourth lens, the refractive index of the eighth lens is larger than that of the fifth lens and the sixth lens, and the refractive index of the seventh lens is larger than that of the sixth lens.

Further, the third lens and the fourth lens are mutually glued.

Further, the second lens and the third lens are cemented to each other.

Further, the optical imaging lens further satisfies the following conditions: 1.1< f1/f <1.3, 0.8< f8/f <1.0, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f8 is the focal length of the eighth lens.

Further, the optical imaging lens further satisfies the following conditions: phi 234/phi is more than or equal to 1.5, wherein phi 234 is the combined focal power of the second lens, the third lens and the fourth lens, and phi is the focal power of the optical imaging lens.

Further, the optical imaging lens further satisfies the following conditions: TTL is less than 1.25f, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and f is the focal length of the optical imaging lens.

Further, the optical imaging lens further satisfies the following conditions: g45>15mm, wherein the distance on the optical axis between the image side surface of the G45 fourth lens and the object side surface of the fifth lens.

The utility model has the advantages of:

the utility model has the advantages of considering parameters such as resolution, depth of field, magnification ratio and the like, having wide working distance, and realizing non-inductive passage without positioning the identification object in a specific small range when being used for iris identification; the resolution ratio is high, and the imaging quality is good; the light passing is large, and the relative illumination is high; the yield rate of the product is high (can reach 80%).

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is an MTF chart of the infrared 0.7800-0.8500 μm for a 1000mm work object distance according to an embodiment of the present invention;

FIG. 3 is an MTF chart of the infrared 0.7800-0.8500 μm for a work object distance of 800mm according to an embodiment of the present invention;

FIG. 4 is an MTF chart of the infrared 0.7800-0.8500 μm at a 13000mm work object distance according to an embodiment of the present invention;

FIG. 5 is a diagram of a 1000mm work object distance of infrared 0.7800-0.8500 μm defocus graph according to an embodiment of the present invention;

fig. 6 is a schematic view of curvature of field and distortion according to the first embodiment of the present invention;

fig. 7 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 8 is an MTF chart of the infrared 0.7800-0.8500 μm for a second 1300mm work object distance according to an embodiment of the present invention;

FIG. 9 is an MTF chart of the infrared 0.7800-0.8500 μm for a work object distance of two 800mm according to an embodiment of the present invention;

FIG. 10 is an MTF plot of the infrared 0.7800-0.8500 μm for a second 2000mm work object distance according to an embodiment of the present invention;

FIG. 11 is a defocus graph of 0.7800-0.8500 μm in the infrared ray of a two 1300mm work object distance according to an embodiment of the present invention;

fig. 12 is a schematic view of curvature of field and distortion in the second embodiment of the present invention;

fig. 13 is a schematic structural view of a third embodiment of the present invention;

FIG. 14 is an MTF plot of the infrared 0.7800-0.8500 μm for a three 1300mm work object distance according to an embodiment of the present invention;

FIG. 15 is an MTF plot of the infrared 0.7800-0.8500 μm for a three 800mm work object distance in accordance with an embodiment of the present invention;

FIG. 16 is an MTF plot of the infrared 0.7800-0.8500 μm for a three 2000mm work object distance in accordance with an embodiment of the present invention;

FIG. 17 is a defocus plot of 0.7800-0.8500 μm in the infrared of a three 1300mm work object distance according to an embodiment of the present invention;

fig. 18 is a graphical illustration of curvature of field and distortion of a third embodiment of the present invention;

fig. 19 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 20 is an MTF plot of the infrared 0.7800-0.8500 μm for a four 1000mm work object distance in accordance with an embodiment of the present invention;

FIG. 21 is an MTF plot of the infrared 0.7800-0.8500 μm for a four 500mm work object distance in accordance with an embodiment of the present invention;

FIG. 22 is an MTF plot of the infrared 0.7800-0.8500 μm for a four 1500mm work object distance in accordance with an embodiment of the present invention;

FIG. 23 is a defocus plot of 0.7800-0.8500 μm in the infrared for a four 1300mm work object distance according to an embodiment of the present invention;

fig. 24 is a graphical illustration of curvature of field and distortion for a fourth embodiment of the present invention;

fig. 25 is a schematic structural diagram of a fifth embodiment of the present invention;

FIG. 26 is an MTF plot of the infrared 0.7800-0.8500 μm for a five 1000mm work object distance in accordance with an embodiment of the present invention;

FIG. 27 is an MTF plot of the infrared 0.7800-0.8500 μm for a five 500mm work object distance in accordance with an embodiment of the present invention;

FIG. 28 is an MTF plot of the infrared 0.7800-0.8500 μm for a five 1500mm work object distance in accordance with an embodiment of the present invention;

FIG. 29 is a defocus plot of the infrared 0.7800-0.8500 μm for a five 1300mm work object distance in accordance with an embodiment of the present invention;

fig. 30 is a schematic view of curvature of field and distortion according to embodiment five of the present invention.

Detailed Description

To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The present invention will now be further described with reference to the accompanying drawings and detailed description.

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 provides an optical imaging lens matched with a liquid lens, which sequentially comprises a first lens, a fourth lens, a diaphragm, a liquid lens, a fifth lens, a seventh lens and a lens cover from an object side to an image side along an optical axis; the first lens element to the seventh lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.

The first lens element has positive refractive index, and the object-side surface of the first lens element is convex.

The second lens element has positive refractive index, and the object-side surface of the second lens element is convex.

The third lens element has a negative refractive index and a concave image-side surface.

The fourth lens element with positive refractive power has a convex object-side surface and a flat or concave image-side surface.

The fifth lens element has negative refractive index, and the object-side surface of the fifth lens element is concave or planar.

The sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface.

The first lens pre-refracts the system, the second lens, the third lens and the fourth lens form a system to compress the light height, so that the light beam can approximately parallel to the optical axis and pass through the diaphragm and the liquid lens, the influence of the liquid lens on the system sensitivity and relative illumination is reduced, the fifth lens expands the light height of the light beam emitted by the liquid lens, and a larger image height is obtained.

The utility model has the advantages of considering parameters such as resolution, depth of field, magnification ratio and the like, having wide working distance, and realizing non-inductive passage without positioning the identification object in a specific small range when being used for iris identification; the resolution ratio is high, and the imaging quality is good; the light passing is large; the yield rate of the product is high (can reach 80%).

Preferably, the optical lens assembly further includes an eighth lens element disposed between the fifth lens element and the sixth lens element, the eighth lens element has a positive refractive index, an object-side surface of the eighth lens element is concave, and an image-side surface of the eighth lens element is convex, so as to further improve overall performance.

More preferably, the refractive index of the first lens is greater than that of the second lens, the refractive index of the third lens is greater than that of the second lens and that of the fourth lens, the refractive index of the eighth lens is greater than that of the fifth lens and that of the sixth lens, and the refractive index of the seventh lens is greater than that of the sixth lens, so that aberration and chromatic aberration are further eliminated, and the imaging quality is improved.

Preferably, the third lens and the fourth lens are mutually glued, so that the yield and the manufacturability are further improved.

More preferably, the second lens and the third lens are cemented with each other, so as to further improve the yield and the manufacturability.

Preferably, the optical imaging lens further satisfies: 1.1< f1/f <1.3, 0.8< f8/f <1.0, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f8 is the focal length of the eighth lens, so that the focal length of the optical imaging lens is about 50 mm.

Preferably, the optical imaging lens further satisfies: phi 234/phi is more than or equal to 1.5, wherein phi 234 is the combined focal power of the second lens, the third lens and the fourth lens, and phi is the focal power of the optical imaging lens, so that the light transmission is further increased.

Preferably, the optical imaging lens further satisfies: TTL is less than 1.25f, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, f is the focal length of the optical imaging lens, and the system length of the optical imaging lens is further shortened.

Preferably, the optical imaging lens further satisfies: g45>15mm, wherein the distance between the image side surface of the G45 fourth lens and the object side surface of the fifth lens on the optical axis is convenient for assembling the liquid lens, and the process feasibility is improved.

The following describes the optical imaging lens with the liquid lens according to the present invention in detail with specific embodiments.

Example one

As shown in fig. 1, an optical imaging lens incorporating a liquid lens includes, in order from an object side a1 to an image side a2 along an optical axis I, a first lens element 1, a second lens element 2, a third lens element 3, a fourth lens element 4, a stop 9, a liquid lens 100, a fifth lens element 5, a sixth lens element 6, a seventh lens element 7, a protective glass 110, and an image plane 120; the first lens element 1 to the seventh lens element 7 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.

The first lens element 1 has positive refractive power, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is convex, although in other embodiments, the image-side surface 12 of the first lens element 1 may be concave or planar.

The second lens element 2 has positive refractive power, the object-side surface 21 of the second lens element 2 is convex, and the image-side surface 22 of the second lens element 2 is concave, although in other embodiments, the image-side surface 22 of the second lens element 2 can also be convex or flat.

The third lens element 3 has negative refractive power, the object-side surface 31 of the third lens element 3 is concave, and the image-side surface 33 of the third lens element 31 is concave, although in other embodiments, the object-side surface 31 of the third lens element 3 can be convex or flat.

The fourth lens element 4 has positive refractive power, the object-side surface 41 of the fourth lens element 4 is convex, and the image-side surface 42 of the fourth lens element 4 is concave, although in other embodiments, the image-side surface 42 of the fourth lens element 4 can also be planar.

The fifth lens element 5 has negative refractive power, the object-side surface 51 of the fifth lens element 5 is concave, and the image-side surface 52 of the fifth lens element 5 is convex, although in other embodiments, the object-side surface 51 of the fifth lens element 5 can be planar, and the image-side surface 52 of the fifth lens element 5 can also be concave or planar.

The sixth lens element 6 has a negative refractive index, and an object-side surface 61 of the sixth lens element 6 is concave and an image-side surface 62 of the sixth lens element 6 is convex.

The seventh lens element 7 has a positive refractive index; the object-side surface 71 of the seventh lens element 7 is convex, and the image-side surface 72 of the seventh lens element 7 is convex, but the image-side surface 72 of the seventh lens element 7 may also be concave in other embodiments.

The liquid lens 100 is a conventional liquid lens, and the specific structure can refer to the prior art, which is not described in detail.

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

Table 1-1 detailed optical data for example one

Please refer to table 6 for the values of the conditional expressions related to this embodiment.

The MTF transfer function graphs of different working object distances of the embodiment are shown in fig. 2, 3 and 4 in detail, so that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and magnification are taken into consideration; the defocusing curve graph is shown in detail in FIG. 5, and it can be seen that the imaging quality is better; referring to (a) and (B) of fig. 6, it can be seen that the field curvature and distortion are small, and the distortion amount is less than 1.9%.

In this embodiment, the focal length f of the optical imaging lens is 53.0 mm; f, FNO 3.5; field angle FOV is 15.6 °; the size of an image plane is 16.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 56.85 mm.

Example two

As shown in fig. 7, an optical imaging lens incorporating a liquid lens includes, in order from an object side a1 to an image side a2 along an optical axis I, a first lens element 1, a second lens element 2, a third lens element 3, a fourth lens element 4, a stop 9, a liquid lens 100, a fifth lens element 5, an eighth lens element 8, a sixth lens element 6, a seventh lens element 7, a protective glass 110, and an image plane 120; the first lens element 1 to the eighth lens element 8 each include an object-side surface facing the object side a1 and passing the imaging light rays, and an image-side surface facing the image side a2 and passing the imaging light rays.

The first lens element 1 has positive refractive power, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is concave, although in other embodiments, the image-side surface 12 of the first lens element 1 may be convex or flat.

The second lens element 2 has positive refractive power, the object-side surface 21 of the second lens element 2 is convex, and the image-side surface 22 of the second lens element 2 is planar, although in other embodiments, the image-side surface 22 of the second lens element 2 can be convex or concave.

The third lens element 3 has negative refractive power, the object-side surface 31 of the third lens element 3 is a flat surface, and the image-side surface 33 of the third lens element 31 is a concave surface, although in other embodiments, the object-side surface 31 of the third lens element 3 can also be a convex surface or a concave surface.

The fifth lens element 5 has negative refractive power, the object-side surface 51 of the fifth lens element 5 is concave, and the image-side surface 52 of the fifth lens element 5 is concave, although in other embodiments, the object-side surface 51 of the fifth lens element 5 can be planar, and the image-side surface 52 of the fifth lens element 5 can be convex or planar.

The eighth lens element 8 has a positive refractive index, and an object-side surface 81 of the eighth lens element 8 is concave and an image-side surface 82 of the eighth lens element 8 is convex.

The seventh lens element 7 has a positive refractive index; the object-side surface 71 of the seventh lens element 7 is convex, and the image-side surface 72 of the seventh lens element 7 is concave.

In this embodiment, the third lens 3 and the fourth lens 4 are cemented to each other.

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

TABLE 2-1 detailed optical data for example two

The MTF transfer function graphs of different working object distances of the embodiment are shown in fig. 8, 9 and 10 in detail, so that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and magnification are taken into consideration; the defocusing graph is shown in detail in FIG. 11, and it can be seen that the imaging quality is better; referring to (a) and (B) of fig. 12, it can be seen that the field curvature and distortion are small, and the distortion amount is less than 1.0%.

The imaging quality of this example is better than that of the first example.

In this embodiment, the focal length f of the optical imaging lens is 50.5 mm; f, FNO 3.8; field angle FOV is 16.8 °; the size of an image plane is 16.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 53.90 mm.

EXAMPLE III

As shown in fig. 13, the lens elements of this embodiment and the second embodiment have the same surface roughness and refractive index, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different. In addition, in the present embodiment, the second lens 2 and the third lens 3 are cemented with each other, and the third lens 3 and the fourth lens 4 are cemented with each other.

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

TABLE 3-1 detailed optical data for EXAMPLE III

The MTF transfer function graphs of different working object distances of the embodiment are shown in fig. 14, 15 and 16 in detail, so that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and the like are considered; the defocusing curve graph is shown in detail in FIG. 17, and it can be seen that the imaging quality is better; referring to (a) and (B) of fig. 18, it can be seen that the field curvature and distortion are small, and the distortion amount is less than 0.9%.

In this embodiment, the focal length f of the optical imaging lens is 50.7 mm; f, FNO 3.8; field angle FOV is 16.7 °; the size of an image plane is 16.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 54.92 mm.

Example four

As shown in fig. 19, in this embodiment, the surface convexities and concavities and refractive indexes of the lenses are substantially the same as those of the third embodiment, and only the image-side surface 12 of the first lens element 1 is a flat surface, the image-side surface 22 of the second lens element 2 is a concave surface, the object-side surface 31 of the third lens element 3 is a convex surface, and the object-side surface 51 of the fifth lens element 5 is a flat surface.

The detailed optical data of this embodiment is shown in Table 4-1.

TABLE 4-1 detailed optical data for example four

The MTF transfer function graphs of different working object distances of the embodiment are shown in fig. 20, 21 and 22 in detail, so that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and the like are considered; the defocusing curve graph is shown in detail in FIG. 23, and it can be seen that the imaging quality is better; referring to (a) and (B) of fig. 24, it can be seen that the field curvature and distortion are small, and the distortion amount is less than 2.50%.

In this embodiment, the focal length f of the optical imaging lens is 50.0 mm; f, FNO 3.5; field angle FOV is 16.3 °; the size of an image plane is 16.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 120 on the optical axis I is 55.87 mm.

EXAMPLE five

As shown in fig. 25, in this embodiment, the surface convexoconcave and the refractive index of each lens element are substantially the same as those of the fourth embodiment, only the object-side surface 51 of the fifth lens element 5 is a concave surface, and the image-side surface 72 of the seventh lens element 7 is a convex surface, and the optical parameters such as the curvature radius of each lens element surface and the lens thickness are different.

The detailed optical data of this embodiment is shown in Table 5-1.

TABLE 5-1 detailed optical data for EXAMPLE V

The MTF transfer function graphs of different working object distances of the embodiment are shown in fig. 26, 27 and 28 in detail, so that the working object distance range is wide, the resolution can meet the use requirement of a 4K resolution sensor, and parameters such as resolution, depth of field and the like are considered; the defocusing curve graph is shown in detail in fig. 29, and it can be seen that the imaging quality is better; referring to (a) and (B) of fig. 30, it can be seen that the field curvature and distortion are small, and the distortion amount is less than 2.50%.

In this embodiment, the focal length f of the optical imaging lens is 55.0 mm; f, FNO 3.5; field angle FOV is 14.7 °; the size of an image plane is 16.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image forming surface 120 on the optical axis I is 59.84 mm.

Table 6 values of relevant important parameters of five embodiments of the present invention

	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment
						f1/f	1.12	1.14	1.28	1.22	1.17
f8/f	0.93	0.92	0.93	0.82	0.83
						Φ234	0.003	0.003	0.006	0.006	0.005
Φ	0.020	0.020	0.020	0.018	0.019
						Φ234/Φ	0.15	0.17	0.29	0.31	0.27
TTL	53.90	54.92	55.87	59.84	56.85
						1.25f	63.125	63.375	62.5	68.75	66.25
G45	16.99	16.73	17.68	17.72	17.79

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a collocation liquid lens's optical imaging lens which characterized in that: the liquid lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a liquid lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an image side along an optical axis; the first lens element to the seventh lens element each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light;

2. The optical imaging lens matched with a liquid lens as claimed in claim 1, wherein: the fourth lens element is arranged between the fifth lens element and the sixth lens element, and has a positive refractive index, a concave object-side surface, and a convex image-side surface.

3. The optical imaging lens matched with a liquid lens as claimed in claim 2, wherein: the refractive index of the first lens is larger than that of the second lens, the refractive index of the third lens is larger than that of the second lens and the fourth lens, the refractive index of the eighth lens is larger than that of the fifth lens and the sixth lens, and the refractive index of the seventh lens is larger than that of the sixth lens.

4. The optical imaging lens matched with the liquid lens as claimed in claim 1 or 2, wherein: the third lens and the fourth lens are mutually glued.

5. The optical imaging lens matched with a liquid lens as claimed in claim 4, wherein: the second lens and the third lens are cemented to each other.

6. The optical imaging lens matched with a liquid lens of claim 1 or 2, wherein the optical imaging lens further satisfies: 1.1< f1/f <1.3, 0.8< f8/f <1.0, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, and f8 is the focal length of the eighth lens.

7. The optical imaging lens matched with a liquid lens of claim 1 or 2, wherein the optical imaging lens further satisfies: phi 234/phi is more than or equal to 1.5, wherein phi 234 is the combined focal power of the second lens, the third lens and the fourth lens, and phi is the focal power of the optical imaging lens.

8. The optical imaging lens matched with a liquid lens of claim 1 or 2, wherein the optical imaging lens further satisfies: TTL is less than 1.25f, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and f is the focal length of the optical imaging lens.

9. The optical imaging lens matched with a liquid lens of claim 1 or 2, wherein the optical imaging lens further satisfies: g45>15mm, wherein the distance on the optical axis between the image side surface of the G45 fourth lens and the object side surface of the fifth lens.