CN213069314U

CN213069314U - Optical imaging lens

Info

Publication number: CN213069314U
Application number: CN202022273705.4U
Authority: CN
Inventors: 张瑞翔; 张军光
Original assignee: Xiamen Leading Optics Co Ltd
Current assignee: Xiamen Leading Optics Co Ltd
Priority date: 2020-10-13
Filing date: 2020-10-13
Publication date: 2021-04-27
Anticipated expiration: 2030-10-13

Abstract

The utility model discloses an optical imaging lens, which comprises a first lens to an eleventh lens; the first lens element to the eleventh lens element each include an object-side surface and an image-side surface; the first lens has positive refractive index; the second lens has positive refractive index; the third lens element has positive refractive index; the fourth lens element has negative refractive index; the fifth lens element has negative refractive index; the sixth lens element has negative refractive index; the seventh lens element has positive refractive index; the eighth lens element has a negative refractive index; the ninth lens element has positive refractive index; the tenth lens element has a positive refractive index; the eleventh lens element has positive refractive index; the lens includes three groups of cemented lenses. The utility model adopts eleven lenses, and through correspondingly designing each lens, the lens supports the switching from the near object distance of 0.5m to infinity, and ensures the high-definition imaging of the distant view and the close view; meanwhile, the whole mass is small, the driving force of the motor is small, the heat dissipation is less, and the influence on imaging can be reduced; small distortion, small image deformation, small aberration and chromatic aberration, and good color consistency.

Description

Optical imaging lens

Technical Field

The utility model relates to a camera lens technical field, concretely relates to optical imaging 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. However, the internal focusing optical imaging lens in the prior art has at least the following defects:

1. the shortest working shooting distance of the lens is larger, and the lens does not support a very close working object distance.

2. The telephoto lens cannot simultaneously achieve high-definition imaging in a long-range and a short-range view.

3. The focusing group comprises more lenses, larger mass, large driving force and more heat dissipation of the motor.

4. The optical distortion is large, the deformation amount of the image edge is large, the edge aberration and chromatic aberration are large, and the color reducibility is poor.

Therefore, the existing inner focus lenses have been unable to meet the increasing demands, and improvements thereof are needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above prior art is not enough, provides an optical imaging lens.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis; the first lens element to the eleventh lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough;

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

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

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

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

the fifth lens element has a negative refractive index, and the object-side surface and the image-side surface of the fifth lens element are concave;

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

the seventh lens element with positive refractive index has a convex object-side surface and a convex image-side surface;

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

the ninth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;

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

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

the lens comprises three groups of cemented lenses, and a diaphragm is positioned between the fourth lens and the fifth cemented lens.

Preferably, the image side surface of the third lens and the object side surface of the fourth lens are mutually glued; the image side surface of the sixth lens and the object side surface of the seventh lens are mutually glued; and the image side surface of the eighth lens and the object side surface of the ninth lens are mutually glued.

Preferably, in the cemented lens consisting of the third lens and the fourth lens, the cemented lens consisting of the sixth lens and the seventh lens, and the cemented lens consisting of the eighth lens and the ninth lens, the difference between the abbe numbers of the materials between each two is Vd, and 25< Vd < 35.

Preferably, the sixth and seventh cemented lenses, the eighth and ninth cemented lenses constitute a double-gauss symmetrical structure.

Preferably, the following condition is satisfied between the focal lengths of the first to eleventh lenses and the focal length of the entire lens:

wherein f, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f34, f67, f89 are focal lengths of the entire lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the third and fourth cemented lenses, the sixth and seventh cemented lenses, and the eighth and ninth cemented lenses, respectively.

Preferably, the lens barrel further satisfies: TTL <120mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.

Preferably, the lens barrel further satisfies: 1.45< ALT/ALG <1.68, where ALG is a sum of air gaps of the first to eleventh lenses on an optical axis, and ALT is a sum of lens thicknesses of the first to eleventh lenses on the optical axis.

Preferably, the refractive indexes nd of the first lens, the seventh lens and the eleventh lens all satisfy: nd is more than or equal to 1.83 and less than or equal to 1.95.

After the technical scheme is adopted, compared with the background art, the utility model, have following advantage:

the utility model adopts eleven lenses along the direction from the object side to the image side, and makes the lens support the switching from the near object distance of 0.5m to the infinite distance by correspondingly designing each lens, and ensures the high-definition imaging of the distant view and the close view; meanwhile, the whole mass is small, the driving force of the motor is small, the heat dissipation is less, and the influence on imaging can be reduced; small distortion, small image deformation, small aberration and chromatic aberration, and good color consistency.

Drawings

FIG. 1 is a light path diagram according to the first embodiment;

FIG. 2 is a graph of MTF under visible light for a lens according to a first embodiment;

FIG. 3 is a graph of relative illumination of a lens under visible light according to one embodiment;

FIG. 4 is a diagram illustrating the curvature of field and distortion of a lens under visible light according to an embodiment;

FIG. 5 is a lateral aberration diagram of a lens under visible light according to a first embodiment;

FIG. 6 is a longitudinal aberration diagram of a lens under visible light according to the first embodiment;

FIG. 7 is a light path diagram of the second embodiment;

FIG. 8 is a graph of MTF under visible light for a lens of example two;

FIG. 9 is a graph of relative illumination under visible light for a lens according to a second embodiment;

FIG. 10 is a graph of field curvature and distortion under visible light for a lens of the second embodiment;

FIG. 11 is a lateral aberration diagram of the lens of the second embodiment under visible light;

FIG. 12 is a longitudinal aberration diagram of the lens of the second embodiment under visible light;

FIG. 13 is a light path diagram of the third embodiment;

fig. 14 is a graph of MTF under visible light for a lens in the third embodiment;

FIG. 15 is a graph of relative illumination of the lens under visible light according to the third embodiment;

FIG. 16 is a graph of field curvature and distortion under visible light for a lens barrel according to the third embodiment;

FIG. 17 is a lateral aberration diagram of a lens of the third embodiment under visible light;

FIG. 18 is a longitudinal aberration diagram of a lens barrel according to the third embodiment under visible light;

FIG. 19 is a light path diagram of the fourth embodiment;

fig. 20 is a graph of MTF in visible light for the lens in the fourth embodiment;

FIG. 21 is a graph of relative illuminance under visible light for a lens of the fourth embodiment;

FIG. 22 is a graph of field curvature and distortion under visible light for a lens barrel according to a fourth embodiment;

FIG. 23 is a lateral aberration diagram of a lens barrel according to the fourth embodiment under visible light;

fig. 24 is a longitudinal aberration diagram of the lens in the fourth embodiment under visible light.

Description of reference numerals:

the lens system comprises a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, an aperture stop 12 and a protective glass 13.

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.

In the present specification, 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 the gauss theory 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 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 an optical imaging lens, which comprises a first lens to an eleventh lens from an object side to an image side along an optical axis in sequence; the first lens element to the eleventh lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough;

the lens with the refractive index is only eleven, the lens comprises three groups of cemented lenses, and the diaphragm is positioned between the fourth lens and the fifth cemented lens and adopts an optical structure of four sides before and seven sides after the diaphragm.

Preferably, in the cemented lens consisting of the third lens and the fourth lens, the cemented lens consisting of the sixth lens and the seventh lens, and the cemented lens consisting of the eighth lens and the ninth lens, the difference between the abbe numbers of the materials between each two is Vd, and 25< Vd < 35. The third lens and the fourth lens are concave-convex cemented lenses, the sixth lens and the seventh lens are double-concave double-convex cemented lenses, and the eighth lens and the ninth lens are respectively concave-convex and double-convex cemented lenses, so that aberration such as spherical aberration and coma aberration can be corrected, and the MTF resolution can be improved.

Preferably, the sixth and seventh cemented lenses and the eighth and ninth cemented lenses form a double-gauss symmetrical structure, which can correct high-order aberration well and improve imaging quality.

Preferably, the refractive indexes nd of the first lens, the seventh lens and the eleventh lens all satisfy: nd is more than or equal to 1.83 and less than or equal to 1.95, and the optical structure can be better optimized by selecting a material with high refractive index.

The following describes the internal focusing high definition lens according to the present invention in detail with specific embodiments.

Example one

Referring to fig. 1, the present embodiment discloses an optical imaging lens, which includes, in order along an optical axis, a first lens element 1 to an eleventh lens element 11 from an object side a1 to an image side a 2; the first lens element 1 to the eleventh lens element 11 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 a positive refractive index, and the object-side surface and the image-side surface of the first lens element 1 are convex and concave;

the second lens element 2 has a positive refractive index, and the object-side surface and the image-side surface of the second lens element 2 are convex and concave;

the third lens element 3 has a positive refractive index, and the object-side surface and the image-side surface of the third lens element 3 are convex and concave;

the fourth lens element 4 has a negative refractive index, and the object-side surface and the image-side surface of the fourth lens element 4 are convex and concave;

the fifth lens element 5 has a negative refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are concave;

the sixth lens element 6 has a negative refractive index, and the sixth lens element 6 has a concave object-side surface and a concave image-side surface;

the seventh lens element 7 has a positive refractive index, and the seventh lens element 7 has a convex object-side surface and a convex image-side surface;

the eighth lens element 8 has a negative refractive index, and the eighth lens element 8 has a convex object-side surface and a concave image-side surface;

the ninth lens element 9 has a positive refractive index, and the ninth lens element 9 has a convex object-side surface and a convex image-side surface;

the tenth lens element 10 with positive refractive index has a convex object-side surface and a concave image-side surface, and the tenth lens element 10 has a convex object-side surface and a concave image-side surface;

the eleventh lens element 11 has a positive refractive index, and the eleventh lens element 11 has a concave object-side surface and a convex image-side surface.

In the present embodiment, the diaphragm 12 is disposed between the fourth lens 4 and the fifth lens 5, but the diaphragm 12 may be disposed at other suitable positions in other embodiments.

Detailed optical data of this embodiment are shown in table 1.

Table 1 detailed optical data of example one

Surface of		Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									0	Shot object surface	0	Infinity	Infinity
1	First lens	48.07	47.087	4.74	H-ZF52	1.85	23.79	118.89
									2		46.90	83.645	0.27
3	Second lens	46.12	61.351	4.17	H-ZF13	1.78	25.72	119.90
									4		44.83	168.173	0.22
5	Third lens	29.60	24.402	7.51	H-FK61B	1.50	81.59	55.18
									6	Fourth lens	29.60	194.236	5.84	H-ZF10	1.69	31.16	-22.07
7		20.76	14.022	5.02
									8	Diaphragm surface	17.35	Infinity	5.81
9	Fifth lens element	19.00	-30.380	1.37	H-ZF1A	1.65	33.90	-29.48
									10		18.45	53.292	1.95
11	Sixth lens element	22.40	-98.623	1.84	H-ZF4A	1.73	28.31	-22.86
									12	Seventh lens element	22.40	20.387	13.78	H-ZLAF55D	1.83	42.73	17.67
13		22.40	-37.645	3.64
									14	Eighth lens element	22.40	108.186	5.55	H-ZF4A	1.73	28.31	-36.67
15	Ninth lens	22.40	21.095	5.51	H-ZPK5	1.59	68.35	30.13
									16		22.00	-107.530	3.98
17	Tenth lens	24.00	39.454	6.30	H-LAF50B	1.77	49.61	86.97
									18		24.00	88.324	4.28
19	Eleventh lens	24.00	-661.711	9.39	H-ZF88	1.95	17.94	63.60
									20		24.00	-56.198	10.83
21	Cover glass	21.24	Infinity	1.80	H-K9L	1.52	64.21	Infinity
									22		20.86	Infinity	10.84
23	Image plane	17.35	Infinity

In this embodiment, the focal length f of the optical imaging lens is 50 mm; f-number FNO 1.61; field angle FOV is 20.4 °; the distance TTL on the optical axis from the object side surface to the image plane of the first lens 1 is 115mm, (f1/f) is 2.43, (f2/f) is 2.45, (f3/f) is 1.13, (f4/f) is-0.45, (f5/f) is-0.60, (f6/f) is-0.47, (f7/f) is 0.36, (f8/f) is-0.75, (f9/f) is 0.61, (f10/f) is 1.77, (f11/f) 1.30, (f34/f) is-1.05, (f67/f) is 0.99, and (f89/f) is 3.56.

Fig. 1 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 2, which shows that when the spatial frequency of the lens reaches 70lp/mm, the full-field transfer function image is still greater than 30%, and the imaging quality is good. Referring to fig. 3, it can be seen that the relative illuminance is greater than or equal to 40%, which provides a more uniform illuminance for the image plane. Referring to fig. 4, it can be seen that the distortion is less than-3.5%, the image deformation is small, the image restoration is accurate, and the imaging quality is high. Referring to fig. 5, a transverse chromatic aberration diagram of visible light and a longitudinal chromatic aberration diagram of visible light refer to fig. 6, which show good color reduction, small chromatic aberration, and insignificant blue-violet phenomenon.

Example two

As shown in fig. 7 to 12, the surface convexo-concave shape and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.

The detailed optical data of this embodiment are shown in table 2.

Table 2 detailed optical data of example two

Surface of		Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									0	Shot object surface	0	Infinity	Infinity
1	First lens	48.07	54.714	4.36	H-ZF52	1.85	23.79	127.41
									2		46.90	105.881	0.27
3	Second lens	46.12	60.560	4.47	H-ZF13	1.78	25.72	114.01
									4		44.83	177.917	0.22
5	Third lens	29.60	24.078	6.99	H-FK61B	1.50	81.59	56.01
									6	Fourth lens	29.60	158.080	6.68	H-ZF10	1.69	31.16	-22.69
7		20.76	14.078	4.42
									8	Diaphragm surface	17.36	Infinity	5.68
9	Fifth lens element	19.00	-33.172	0.70	H-ZF1A	1.65	33.90	-30.69
									10		18.45	50.905	1.89
11	Sixth lens element	22.40	-81.146	4.19	H-ZF4A	1.73	28.31	-22.46
									12	Seventh lens element	22.40	21.154	11.91	H-ZLAF55D	1.83	42.73	17.79
13		22.40	-37.755	6.00
									14	Eighth lens element	22.40	125.068	5.68	H-ZF4A	1.73	28.31	-35.85
15	Ninth lens	22.40	21.329	5.52	H-ZPK5	1.59	68.35	30.64
									16		22.00	-113.297	3.17
17	Tenth lens	24.00	37.866	8.81	H-LAF50B	1.77	49.61	87.31
									18		24.00	77.085	4.39
19	Eleventh lens	24.00	584.278	8.08	H-ZF88	1.95	17.94	58.29
									20		24.00	-61.352	9.76
21	Cover glass	21.47	Infinity	1.80	H-K9L	1.52	64.21	Infinity
									22		21.05	Infinity	10.40
23	Image plane	17.38	Infinity

In this embodiment, the focal length f of the optical imaging lens is 50 mm; f-number FNO 1.61; field angle FOV is 20.4 °; the distance TTL on the optical axis from the object side surface to the image plane of the first lens 1 is 115mm, (f1/f) is 2.55, (f2/f) is 2.28, (f3/f) is 1.12, (f4/f) is-0.45, (f5/f) is-0.61, (f6/f) is-0.45, (f7/f) is 0.36, (f8/f) is-0.72, (f9/f) is 0.61, (f10/f) is 1.75, (f11/f) 1.17, (f34/f) is-1.08, (f67/f) is 1.04, (f89/f) is 4.34.

Fig. 7 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 8, which shows that when the spatial frequency of the lens reaches 70lp/mm, the full-field transfer function image is still greater than 30%, and the imaging quality is good. Referring to fig. 9, it can be seen that the relative illuminance is greater than or equal to 40%, which provides a more uniform illuminance for the image plane. Referring to fig. 10, it can be seen that the distortion is less than-3.5%, the image deformation is small, the image restoration is accurate, and the imaging quality is high. Fig. 11 is a transverse chromatic aberration diagram of visible light, and fig. 12 is a longitudinal chromatic aberration diagram of visible light, from which it can be seen that the color reduction is good, the chromatic aberration is small, and the blue-violet phenomenon is not obvious.

EXAMPLE III

As shown in fig. 13 to 18, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.

The detailed optical data of this embodiment are shown in table 3.

Table 3 detailed optical data of example three

Surface of		Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									0	Shot object surface	0	Infinity	Infinity
1	First lens	48.07	89.748	4.34	H-ZF52	1.85	23.79	142.66
									2		46.90	332.033	0.29
3	Second lens	46.12	56.084	4.87	H-ZF13	1.78	25.72	109.74
									4		44.83	152.054	0.23
5	Third lens	29.60	24.077	6.48	H-FK61B	1.50	81.59	58.09
									6	Fourth lens	29.60	130.140	7.73	H-ZF10	1.69	31.16	-24.22
7		20.76	14.525	3.52
									8	Diaphragm surface	17.45	Infinity	5.63
9	Fifth lens element	19.00	-41.656	1.87	H-ZF1A	1.65	33.90	-32.37
									10		18.45	43.562	1.87
11	Sixth lens element	22.40	-69.368	7.76	H-ZF4A	1.73	28.31	-22.53
									12	Seventh lens element	22.40	22.753	10.07	H-ZLAF55D	1.83	42.73	18.60
13		22.40	-39.707	7.24
									14	Eighth lens element	22.40	135.798	5.57	H-ZF4A	1.73	28.31	-35.05
15	Ninth lens	22.40	21.263	5.44	H-ZPK5	1.59	68.35	31.23
									16		22.00	-133.094	2.34
17	Tenth lens	24.00	36.339	10.99	H-LAF50B	1.77	49.61	89.55
									18		24.00	66.086	4.42
19	Eleventh lens	24.00	183.509	7.77	H-ZF88	1.95	17.94	52.95
									20		24.00	-68.686	6.03
21	Cover glass	22.28	Infinity	1.80	H-K9L	1.52	64.21	Infinity
									22		21.88	Infinity	12.87
23	Image plane	17.37	Infinity

In this embodiment, the focal length f of the optical imaging lens is 50 mm; f-number FNO 1.61; field angle FOV is 20.4 °; the distance TTL on the optical axis from the object side surface to the image plane of the first lens 1 is 115mm, (f1/f) is 2.86, (f2/f) is 2.20, (f3/f) is 1.17, (f4/f) is-0.49, (f5/f) is-0.65, (f6/f) is-0.45, (f7/f) is 0.37, (f8/f) is-0.70, (f9/f) is 0.63, (f10/f) is 1.80, (f11/f) 1.06, (f34/f) is-1.21, (f67/f) is 1.18, and (f89/f) is 5.95.

Fig. 13 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 14, it can be seen that when the spatial frequency of the lens reaches 70lp/mm, the full-field transfer function image is still greater than 30%, and the imaging quality is good. Referring to fig. 15, it can be seen that the relative illuminance is greater than or equal to 40%, which provides a more uniform illuminance for the image plane. Referring to fig. 16, it can be seen that the distortion is less than-3.5%, the image deformation is small, the image restoration is accurate, and the imaging quality is high. Fig. 17 is a transverse chromatic aberration diagram of visible light, and fig. 18 is a longitudinal chromatic aberration diagram of visible light, from which it can be seen that the color reduction is good, the chromatic aberration is small, and the blue-violet phenomenon is not obvious.

Example four

As shown in fig. 19 to 24, the surface convexoconcave and the refractive index of each lens of the present embodiment are substantially the same as those of the first embodiment, and the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.

The detailed optical data of this embodiment are shown in table 4.

Table 4 detailed optical data for example four

Surface of		Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									0	Shot object surface	0	Infinity	Infinity
1	First lens	48.07	1929.844	4.24	H-ZF52	1.85	23.79	145.06
									2		46.90	-132.426	0.28
3	Second lens	46.12	30.716	7.20	H-ZF13	1.78	25.72	78.40
									4		44.83	54.493	0.19
5	Third lens	26.93	30.728	4.35	H-FK61B	1.50	81.59	66.04
									6	Fourth lens	26.93	440.591	5.42	H-ZF10	1.69	31.16	-23.53
7		19.37	15.672	4.96
									8	Diaphragm surface	18.95	Infinity	5.01
9	Fifth lens element	18.51	-32.482	1.94	H-ZF1A	1.65	33.90	-33.20
									10		19.14	66.500	1.96
11	Sixth lens element	19.62	-196.553	16.25	H-ZF4A	1.73	28.31	-35.35
									12	Seventh lens element	26.80	30.955	8.75	H-ZLAF55D	1.83	42.73	22.55
13		27.60	-42.425	15.96
									14	Eighth lens element	26.20	-1411.788	5.55	H-ZF4A	1.73	28.31	-36.93
15	Ninth lens	26.20	27.694	5.96	H-ZPK5	1.59	68.35	38.41
									16		26.40	-120.031	4.82
17	Tenth lens	30.01	49.584	13.94	H-LAF50B	1.77	49.61	86.24
									18		29.27	167.747	2.36
19	Eleventh lens	29.34	139.182	16.55	H-ZF88	1.95	17.94	69.43
									20		27.97	-120.057	4.00
21	Cover glass	25.85	Infinity	1.80	H-K9L	1.52	64.21	Infinity
									22		25.33	Infinity	17.43
23	Image plane	17.66	Infinity

In this embodiment, the focal length f of the optical imaging lens is 50 mm; f-number FNO 1.61; field angle FOV is 20.4 °; the distance TTL on the optical axis from the object side surface to the image plane of the first lens 1 is 115mm, (f1/f) is 2.90, (f2/f) is 1.57, (f3/f) is 1.32, (f4/f) is-0.47, (f5/f) is-0.66, (f6/f) is-0.71, (f7/f) is 0.45, (f8/f) is-0.74, (f9/f) is 0.77, (f10/f) is 1.72, (f11/f) 1.39, (f34/f) is-0.86, (f67/f) is 0.99, and (f89/f) is-40.22.

Fig. 19 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Please refer to fig. 20, which shows that when the spatial frequency of the lens reaches 70lp/mm, the full-field transfer function image is still greater than 30%, and the imaging quality is good. Referring to fig. 21, it can be seen that the relative illuminance is greater than or equal to 40%, which provides a more uniform illuminance for the image plane. Referring to fig. 22, it can be seen that the distortion is less than-3.5%, the image deformation is small, the image restoration is accurate, and the imaging quality is high. Fig. 23 is a transverse chromatic aberration diagram of visible light, and fig. 24 is a longitudinal chromatic aberration diagram of visible light, from which it can be seen that the color reduction is good, the chromatic aberration is small, and the blue-violet phenomenon is not obvious.

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. An optical imaging lens is characterized by comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from an object side to an image side along an optical axis; the first lens element to the eleventh lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough, and an image-side surface facing the image side and allowing the imaging light to pass therethrough;

2. An optical imaging lens as claimed in claim 1, wherein the image side surface of the third lens element is cemented with the object side surface of the fourth lens element; the image side surface of the sixth lens and the object side surface of the seventh lens are mutually glued; and the image side surface of the eighth lens and the object side surface of the ninth lens are mutually glued.

3. An optical imaging lens according to claim 2, wherein the difference between the abbe numbers of the materials of the cemented lens consisting of the third lens and the fourth lens, the cemented lens consisting of the sixth lens and the seventh lens, and the cemented lens consisting of the eighth lens and the ninth lens is Vd, and 25< Vd < 35.

4. An optical imaging lens according to claim 3, wherein the sixth and seventh cemented lenses and the eighth and ninth cemented lenses constitute a double gauss symmetric structure.

5. An optical imaging lens according to claim 2, wherein the following condition is satisfied between the focal lengths of the first to eleventh lenses and the focal length of the entire lens:

2.42<(f1/f)<2.91，1.56<(f2/f)<2.46，

1.12<(f3/f)<1.33，-0.50<(f4/f)<-0.44，

-0.67<(f5/f)<-0.59，-0.72<(f6/f)<-0.44，

0.32<(f7/f)<0.46，-0.76<(f8/f)<-0.69，

0.58<(f9/f)<0.78，1.71<(f10/f)<1.81，

1.04<(f11/f)<1.40，-1.22<(f34/f)<-0.85，

0.98<(f67/f)<1.19，-40.24<(f89/f)<5.96，

6. An optical imaging lens as claimed in claim 1, characterized in that the lens further satisfies: TTL <120mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.

7. An optical imaging lens as claimed in claim 1, characterized in that the lens further satisfies: 1.45< ALT/ALG <1.68, where ALG is a sum of air gaps of the first to eleventh lenses on an optical axis, and ALT is a sum of lens thicknesses of the first to eleventh lenses on the optical axis.

8. An optical imaging lens according to claim 1, wherein the refractive indexes nd of the first lens, the seventh lens and the eleventh lens satisfy: nd is more than or equal to 1.83 and less than or equal to 1.95.