CN113341543A

CN113341543A - Large-image-surface athermal optical imaging lens

Info

Publication number: CN113341543A
Application number: CN202110734481.9A
Authority: CN
Inventors: 潘锐乔; 曹来书; 黄波; 胡龙昌
Original assignee: Xiamen Leading Optics Co Ltd
Current assignee: Xiamen Leading Optics Co Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-09-03

Abstract

The invention discloses a large-image-surface athermalization-free optical imaging lens which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein the first lens, the second lens and the third lens are arranged in parallel; the first lens to the eleventh lens respectively comprise an object side surface and an image side surface; the first lens has positive refractive index; the second lens has negative refractive index; the third lens element has negative refractive index; the fourth lens element has positive refractive index; the fifth lens element has positive refractive index; the sixth lens element has positive refractive index; the seventh lens element has a negative refractive index; the eighth lens element has positive refractive index; the ninth lens element has positive refractive index; the tenth lens element has a negative refractive index; the eleventh lens element has positive refractive index; the lens has only the eleven lens elements with the refractive index. The field angle of the invention can reach 70 degrees, the size of an imaging surface is ∅ 11mm, the optical distortion is controlled within 2.1 percent, the deformation quantity corresponding to an image and an object is small, the image is clear and does not deform, the imaging quality is high, and the distortion is not required to be corrected by a later image algorithm; the vertical axis chromatic aberration and the axial chromatic aberration of the lens are small, the field chromatic aberration is small, the color reducibility is good, and the blue-violet phenomenon is not obvious.

Description

Large-image-surface athermal optical imaging lens

Technical Field

The invention relates to the technical field of lenses, in particular to a large-image-surface athermal optical imaging 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 the optical imaging lens is widely applied to various fields of industrial machine vision systems, smart phones, vehicle-mounted monitoring, security monitoring and the like. However, the optical imaging lens currently applied to the industrial field in the market has at least the following disadvantages:

1. the existing imaging lens applied to the industrial field has insufficient field angle and small imaging surface.

2. The blue-violet edge phenomenon can occur in the existing imaging lens applied to the industrial field.

3. The existing imaging lens applied to the industrial field has a long structure.

4. The existing imaging lens applied to the industrial field has large lens temperature drift, and the imaging quality is influenced when the temperature disturbance is overlarge.

Disclosure of Invention

The invention aims to provide a large-image-surface athermalized optical imaging lens, which at least solves one of the problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a large-image-surface athermalized optical imaging lens sequentially comprises a first lens, a second lens, a third lens and an eleventh 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 negative refractive index has a convex object-side surface and a concave image-side surface;

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

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

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

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

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

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

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

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

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

the optical imaging lens has only eleven lenses with the refractive index.

Preferably, the image side surface of the seventh lens and the object side surface of the eighth lens are cemented with each other, and the following conditions are satisfied:

vd7 is less than or equal to 24, Vd8 is more than or equal to 52, and | Vd8-Vd7| is more than 28, wherein Vd7 is the seventh lens dispersion coefficient, and Vd8 is the eighth lens dispersion coefficient.

Preferably, the image side surface of the ninth lens and the object side surface of the tenth lens are cemented with each other, and the following conditions are satisfied:

vd9 is more than or equal to 68, Vd10 is less than or equal to 21, and | Vd9-Vd10| is more than 47, wherein Vd9 is the dispersion coefficient of the ninth lens, and Vd10 is the dispersion coefficient of the tenth lens.

Preferably, the lens barrel further includes a diaphragm disposed between the fifth lens and the sixth lens.

Preferably, the temperature coefficients dn/dt of the refractive indexes of the sixth lens and the ninth lens are negative values.

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

4.6＜|(f1/f)|＜4.8， 2.1＜|(f2/f)|＜2.3， 1.2＜|(f3/f)|＜1.3，

7.3＜|(f4/f)|＜9.7， 3.1＜|(f5/f)|＜3.5， 2.1＜|(f6/f)|＜2.4，

1.4＜|(f7/f)|＜1.6， 1.8＜|(f8/f)|＜1.9， 1.2＜|(f9/f)|＜1.4，

1.2＜|(f10/f)|＜1.3， 1.9＜|(f11/f)|＜2，

wherein f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, f9, f10 and f11 are the focal length values of 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 and the eleventh lens, respectively.

Preferably, the lens complies with the following conditional expression: TTL is less than 57mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.

After adopting the technical scheme, compared with the background technology, the invention has the following advantages:

1. the field angle of the invention can reach 70 degrees, the size of an imaging surface is ∅ 11mm, the optical distortion is controlled within 2.1 percent, the deformation quantity corresponding to an image and an object is small, the image is clear and does not deform, the imaging quality is high, and the distortion is not required to be corrected by a later image algorithm.

2. The lens has the advantages of small vertical axis chromatic aberration and axial chromatic aberration, small field of view chromatic aberration, good color reducibility and unobvious blue-violet edge phenomenon.

3. The TTL of the invention is less than 57mm, so that the total length of the lens is short, the structure is compact, and the practicability is strong.

4. The refractive index temperature coefficients dn/dt of the sixth lens and the ninth lens are negative values, the focal powers of the sixth lens and the ninth lens are positive, the lens is free of thermalization through optical structure design optimization, the temperature drift is small, when the lens is used in a high-temperature and low-temperature range, the lens can ensure that pictures are clear and cannot be out of focus, and the requirements of most use environments can be met.

5. The CRA of the invention is less than 4.5 degrees, is matched with the sensor, and has good color rendition and uniform illumination.

Drawings

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

FIG. 2 is a graph of MTF of a lens in a range from 440nm to 640nm in a visible light according to a first embodiment;

FIG. 3 is a defocus graph of the lens in the first embodiment under 440nm-640nm of visible light;

FIG. 4 is a graph of vertical axis chromatic aberration under 530nm of visible light for a lens according to an embodiment;

FIG. 5 is a graph of axial chromatic aberration of a lens in the first embodiment in the visible range of 440nm to 640 nm;

FIG. 6 is a graph of field curvature and distortion under 440nm-640nm in the visible light of a lens according to an embodiment;

FIG. 7 is a schematic diagram of a lens according to an embodiment;

FIG. 8 is a light path diagram of the second embodiment;

FIG. 9 is a graph of MTF of a lens of the second embodiment in the range of 440nm to 640nm in visible light;

FIG. 10 is a defocus graph of the lens in the second embodiment under 440nm-640nm of visible light;

FIG. 11 is a graph of vertical axis chromatic aberration under 530nm of visible light for a lens of the second embodiment;

FIG. 12 is a graph showing axial chromatic aberration of a lens of the second embodiment in the visible range of 440nm to 640 nm;

FIG. 13 is a graph of curvature of field and distortion under visible light of 440nm to 640nm for a lens according to the second embodiment;

FIG. 14 is a dot-column diagram of a lens according to a second embodiment;

FIG. 15 is a light path diagram of the third embodiment;

FIG. 16 is a graph of MTF of a lens of the third embodiment in the range of 440nm to 640nm in visible light;

FIG. 17 is a defocus graph of the lens in the third embodiment in the visible light range from 440nm to 640 nm;

FIG. 18 is a graph of vertical axis chromatic aberration at 530nm for visible light for a lens of the third embodiment;

FIG. 19 is a graph showing axial chromatic aberration of a lens of the third embodiment in the visible range of 440nm to 640 nm;

FIG. 20 is a graph of curvature of field and distortion under 440nm-640nm in the third embodiment;

FIG. 21 is a schematic diagram showing a lens barrel according to a third embodiment;

FIG. 22 is a light path diagram of the fourth embodiment;

FIG. 23 is a graph of MTF of a lens of the fourth embodiment in the range of 440nm to 640nm in visible light;

FIG. 24 is a defocus graph of the lens in the fourth embodiment under 440nm-640nm of visible light;

FIG. 25 is a graph of vertical axis chromatic aberration at 530nm for visible light for a lens of the fourth embodiment;

FIG. 26 is a graph showing axial chromatic aberration of a lens of the fourth embodiment in visible light of 440nm to 640 nm;

FIG. 27 is a graph showing the curvature of field and distortion of a lens in the fourth embodiment in the visible range from 440nm to 640 nm;

FIG. 28 is a dot-column diagram of a lens according to a fourth embodiment.

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 various embodiments, the 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. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The 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 invention discloses a large-image-surface athermalization-free optical imaging lens which sequentially comprises a first lens, a second lens, a third lens and a fourth 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 optical imaging lens has only eleven lenses with the refractive index.

vd7 is less than or equal to 24, Vd8 is greater than or equal to 52, and | Vd8-Vd7| is greater than 28, wherein Vd7 is the dispersion coefficient of a seventh lens, Vd8 is the dispersion coefficient of an eighth lens, and the two lenses are combined by high-low dispersion materials, so that chromatic aberration can be corrected, the image quality can be optimized, the system performance can be improved, and the blue-violet edge phenomenon which is easy to occur in lens imaging can be avoided.

vd9 is more than or equal to 68, Vd10 is less than or equal to 21, and | Vd9-Vd10| is more than 47, wherein Vd9 is the dispersion coefficient of the ninth lens, Vd10 is the dispersion coefficient of the tenth lens, and the two lenses are combined by high-low dispersion materials, so that chromatic aberration can be corrected, the image quality can be optimized, the system performance can be improved, and the blue-violet edge phenomenon which is easy to occur in lens imaging can be avoided.

Preferably, the lens barrel further comprises a diaphragm, and the diaphragm is arranged between the fifth lens and the sixth lens, but may be arranged at other suitable positions.

Preferably, the temperature coefficient dn/dt of the refractive index of the sixth lens and the temperature coefficient dn/dt of the refractive index of the ninth lens are both negative values, that is, the refractive index of the lenses is reduced along with the rise of the temperature, and the two lenses are both positive lenses, when the external temperature changes, the sixth lens and the ninth lens are made of materials with the dn/dt being negative values, so that the influence of the temperature change on the back focus of the lens can be well counteracted, the temperature drift of the lens can be compensated, the clear picture can be ensured without defocusing when the lens is used in a temperature range from-20 ℃ to 70 ℃, and most of the requirements of use environments can be met.

4.6＜|(f1/f)|＜4.8， 2.1＜|(f2/f)|＜2.3， 1.2＜|(f3/f)|＜1.3，

7.3＜|(f4/f)|＜9.7， 3.1＜|(f5/f)|＜3.5， 2.1＜|(f6/f)|＜2.4，

1.4＜|(f7/f)|＜1.6， 1.8＜|(f8/f)|＜1.9， 1.2＜|(f9/f)|＜1.4，

1.2＜|(f10/f)|＜1.3， 1.9＜|(f11/f)|＜2，

wherein f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, f9, f10 and f11 are the focal length values of 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 and the eleventh lens, respectively. By reasonably distributing the focal power, the performance of an optical system of the lens is more favorably improved.

Preferably, the lens complies with the following conditional expression: TTL is less than 57mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, so that the total length of the lens is short, the structure is compact, and the practicability is high.

The optical imaging lens of the present invention will be described in detail below with specific embodiments.

Example one

Referring to fig. 1, the present embodiment discloses a large image plane athermalization-free 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 negative 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 negative refractive index, and the object-side surface and the image-side surface of the third lens element 3 are concave;

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

the fifth lens element 5 has a positive refractive index, and the object-side surface and the image-side surface of the fifth lens element 5 are convex and planar;

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

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

the eighth lens element 8 has a positive 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 an object-side surface and an image-side surface of the ninth lens element 9 are respectively a plane and a convex surface;

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

the eleventh lens element 11 has a positive refractive index, and an object-side surface and an image-side surface of the eleventh lens element 11 are convex;

the optical imaging lens has only ten lenses with refractive indexes, the image side surface of the seventh lens 7 is mutually cemented with the object side surface of the eighth lens 8, the image side surface of the ninth lens 9 is mutually cemented with the object side surface of the tenth lens 10, the diaphragm 12 is arranged between the fifth lens 5 and the sixth lens 6, and the refractive index temperature coefficients dn/dt of the sixth lens 6 and the ninth lens 9 are negative values.

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

Table 1 detailed optical data of example one

Surface of	Type (B)	Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									OBJ	Shot object surface	1002.685	Infinity	700.000
1	First lens	25.648	20.424	4.730	H-LAF10LA	1.78800	47.517	37.732
									2		23.543	57.639	0.576
3	Second lens	16.503	14.373	1.050	H-ZLAF68B	1.88300	40.807	-17.978
									4		12.370	7.313	3.812
5	Third lens	12.079	-150.459	1.090	H-ZLAF68B	1.88300	40.807	-9.713
									6		10.096	9.208	5.078
7	Fourth lens	9.400	-28.593	3.800	TAFD55	2.00100	29.135	77.295
									8		10.183	-22.344	0.595
9	Fifth lens element	9.800	23.786	3.270	E-FDS1-W	1.92286	20.880	25.355
									STO		9.308	Infinity	3.908
11		8.994	Infinity	3.364
									12	Sixth lens element	10.500	18.020	2.820	H-ZPK1A	1.61800	63.406	18.362
13		10.500	-29.235	0.100
									14	Seventh lens element	9.246	12.450	0.950	H-ZF52GT	1.84667	23.787	-12.081
15	Eighth lens element	9.200	5.460	2.400	H-LAK53B	1.75500	52.337	14.918
									16		8.500	8.533	1.159
17	Ninth lens	8.309	Infinity	2.850	H-ZPK5	1.59281	68.525	10.448
									18	Tenth lens	9.200	-6.225	0.800	E-FDS1-W	1.92286	20.880	-9.863
19		9.904	-20.209	2.662
									20	Eleventh lens	13.356	20.220	2.820	FDS18-W	1.94595	17.984	15.803
21		13.339	-57.572	2.470
									22	Protective sheet	12.575	Infinity	2.076	H-K9L	1.51680	64.212
23		12.214	Infinity	4.591
									24	Image plane	11.010	Infinity

In this embodiment, the focal length f of the optical imaging lens is 8 mm; f-number FNO 1.8; CRA (chief ray angle) 3.7 °, matching 2/3 inch sensor, imaging plane size 2/3 inch, imaging plane size ∅ 11 mm; the distance TTL between the object side surface of the first lens element 1 and the image plane on the optical axis is 56.97 mm; (f 1/f) =4.72, (f 2/f) = -2.25, (f 3/f) = -1.21, (f 4/f) =9.66, (f 5/f) =3.17, (f 6/f) =2.30, (f 7/f) = -1.51, (f 8/f) =1.86, (f 9/f) =1.31, (f 10/f) = -1.23, (f 11/f) = 1.98.

Fig. 1 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 2, it can be seen that when the spatial frequency of the lens reaches 111lp/mm, the full-field transfer function image is still greater than 0.4, the resolution can reach 280 ten thousand pixels, the imaging quality is ensured, the overall static resolution and video resolution of the scheme are greatly improved, and the development of the later-stage image optimization algorithm is greatly facilitated. Please refer to fig. 3, which shows the defocus of the lens under 440nm-640nm, the defocus of the lens under visible light is small. Please refer to fig. 4 for the vertical axis aberration curve of the lens under the light of 530nm and fig. 5 for the on-axis aberration curve of the lens under the light of 440nm to 640nm, which shows that the field aberration is small, the color reducibility is good, and the blue-violet edge phenomenon is not obvious. Please refer to fig. 6 for the field curvature and distortion diagram of the lens under 440nm-640nm light, the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the imaging quality is high, and the distortion is not required to be corrected by the later image algorithm. Please refer to fig. 7, it can be seen that the full field of view point diagrams are all smaller than 4um, the geometric point is smaller than 20um, the aberration is small, and the imaging quality is good.

Example two

As shown in fig. 8 to 14, 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 2.

Table 2 detailed optical data of example two

Surface of	Type (B)	Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									OBJ	Shot object surface	1003.109	Infinity	700.000
1	First lens	25.006	20.422	4.610	H-LAF10LA	1.78800	47.517	38.194
									2		22.815	56.322	0.712
3	Second lens	16.179	14.908	1.000	H-ZLAF68B	1.88300	40.807	-17.046
									4		12.178	7.284	3.771
5	Third lens	11.795	-75.171	1.500	H-ZLAF68B	1.88300	40.807	-9.978
									6		10.018	10.171	4.971
7	Fourth lens	9.944	-27.158	3.670	TAFD65	2.05090	26.942	59.061
									8		11.032	-20.286	0.471
9	Fifth lens element	11.150	26.025	2.020	H-ZF62	1.92287	20.882	27.742
									STO		10.889	Infinity	6.579
11		8.895	Infinity	1.817
									12	Sixth lens element	10.500	17.821	2.820	H-LAK2A	1.69211	54.570	16.995
13		10.500	-32.961	0.100
									14	Seventh lens element	9.086	12.616	0.970	H-ZF52GT	1.84667	23.787	-11.446
15	Eighth lens element	9.200	5.329	2.390	H-LAK53B	1.75500	52.337	14.703
									16		8.400	8.216	1.179
17	Ninth lens	9.200	Infinity	2.760	FCD515	1.59282	68.624	10.432
									18	Tenth lens	9.200	-6.215	0.800	H-ZF62	1.92287	20.882	-9.877
19		9.772	-20.056	3.309
									20	Eleventh lens	13.594	21.621	2.900	FDS18-W	1.94595	17.984	15.631
21		13.594	-46.453	2.470
									22	Protective sheet	12.682	Infinity	1.500	H-K9L	1.51680	64.212
23		12.382	Infinity	4.542
									24	Image plane	11.015	Infinity

In this embodiment, the focal length f of the optical imaging lens is 8 mm; f-number FNO 1.8; CRA (chief ray angle) 4.2 °, matching 2/3 inch sensor, imaging plane size 2/3 inch, imaging plane size ∅ 11 mm; the distance TTL between the object side surface of the first lens element 1 and the image plane on the optical axis is 56.86 mm; (f 1/f) =4.77, (f 2/f) = -2.13, (f 3/f) = -1.25, (f 4/f) =7.38, (f 5/f) =3.47, (f 6/f) =2.12, (f 7/f) = -1.43, (f 8/f) =1.84, (f 9/f) =1.30, (f 10/f) = -1.23, (f 11/f) = 1.95.

Fig. 8 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 9, it can be seen that when the spatial frequency of the lens reaches 111lp/mm, the full-field transfer function image is still greater than 0.4, the resolution can reach 280 ten thousand pixels, the imaging quality is ensured, the overall static resolution and video resolution of the scheme are greatly improved, and the development of the later-stage image optimization algorithm is greatly facilitated. Please refer to fig. 10, which shows the defocus of the lens under 440nm-640nm, and it can be seen that the defocus of the lens under visible light is small. Please refer to fig. 11 for the vertical axis aberration curve of the lens under the light of 530nm and fig. 12 for the on-axis aberration curve of the lens under the light of 440nm to 640nm, which shows that the field aberration is small, the color reproducibility is good, and the blue-violet edge phenomenon is not obvious. Please refer to fig. 13 for the field curvature and distortion diagram of the lens under 440nm-640nm light, the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the imaging quality is high, and the distortion is not required to be corrected by the later image algorithm. Please refer to fig. 14, it can be seen that the full field of view point diagrams are all smaller than 4um, the geometric point is smaller than 20um, the aberration is small, and the imaging quality is good.

EXAMPLE III

As shown in fig. 15 to 21, 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	Type (B)	Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									OBJ	Shot object surface	1003.284	Infinity	700.000
1	First lens	25.224	20.079	4.610	H-LAF10LA	1.78800	47.517	37.260
									2		23.195	56.190	0.597
3	Second lens	16.498	14.951	1.000	H-ZLAF68B	1.88300	40.807	-17.285
									4		12.377	7.345	3.987
5	Third lens	11.824	-71.752	1.440	H-ZLAF68B	1.88300	40.807	-9.741
									6		10.031	9.960	4.961
7	Fourth lens	9.966	-27.384	3.670	TAFD65	2.05090	26.942	60.554
									8		11.069	-20.546	0.408
9	Fifth lens element	11.209	25.644	2.020	H-ZF62	1.92287	20.882	27.337
									STO		10.956	Infinity	6.803
11		8.919	Infinity	1.539
									12	Sixth lens element	10.500	18.211	2.820	H-LAK2A	1.69211	54.570	16.944
13		10.500	-31.401	0.100
									14	Seventh lens element	8.938	12.602	0.970	H-ZF52GT	1.84667	23.787	-11.487
15	Eighth lens element	9.200	5.337	2.390	H-LAK53B	1.75500	52.337	14.623
									16		8.400	8.283	1.167
17	Ninth lens	9.200	Infinity	2.760	H-ZPK5	1.59281	68.525	10.330
									18	Tenth lens	9.200	-6.155	0.800	H-ZF62	1.92287	20.882	-9.682
19		9.690	-20.296	3.411
									20	Eleventh lens	13.610	21.876	2.900	FDS18-W	1.94595	17.984	15.521
21		13.619	-44.266	2.470
									22	Protective sheet	12.690	Infinity	1.500	H-K9L	1.51680	64.212
23		12.387	Infinity	4.540
									24	Image plane	11.010	Infinity

In this embodiment, the focal length f of the optical imaging lens is 8 mm; f-number FNO 1.8; CRA (chief ray angle) 4.3 °, matching 2/3 inch sensor, imaging plane size 2/3 inch, imaging plane size ∅ 11 mm; the distance TTL between the object side surface of the first lens element 1 and the image plane on the optical axis is 56.86 mm; (f 1/f) =4.66, (f 2/f) = -2.16, (f 3/f) = -1.22, (f 4/f) =7.57, (f 5/f) =3.42, (f 6/f) =2.12, (f 7/f) = -1.44, (f 8/f) =1.83, (f 9/f) =1.29, (f 10/f) = -1.21, (f 11/f) = 1.94.

Fig. 15 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 16, it can be seen that when the spatial frequency of the lens reaches 111lp/mm, the full-field transfer function image is still greater than 0.4, the resolution can reach 280 ten thousand pixels, the imaging quality is ensured, the overall static resolution and video resolution of the scheme are greatly improved, and the development of the later-stage image optimization algorithm is greatly facilitated. Please refer to fig. 17, which shows the defocus of the lens under 440nm-640nm, and it can be seen that the defocus of the lens under visible light is small. Please refer to fig. 18 for the vertical axis aberration curve of the lens under the light of 530nm and fig. 19 for the on-axis aberration curve of the lens under the light of 440nm to 640nm, which shows that the field aberration is small, the color reproducibility is good, and the blue-violet edge phenomenon is not obvious. Please refer to fig. 20 for the field curvature and distortion diagram of the lens under 440nm-640nm light, the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the imaging quality is high, and the distortion is not required to be corrected by the later image algorithm. Please refer to fig. 21, it can be seen that the full field of view point diagrams are all smaller than 4um, the geometric point is smaller than 20um, the aberration is small, and the imaging quality is good.

Example four

As shown in fig. 22 to 28, 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 4.

Table 4 detailed optical data for example four

Surface of	Type (B)	Caliber size (diameter)	Radius of curvature	Thickness of	Material of	Refractive index	Coefficient of dispersion	Focal length
									OBJ	Shot object surface	1003.284	Infinity	700.000
1	First lens	25.228	20.082	4.610	H-LAF10LA	1.78800	47.517	37.265
									2		23.200	56.197	0.595
3	Second lens	16.501	14.948	1.000	H-ZLAF68B	1.88300	40.807	-17.285
									4		12.379	7.344	3.989
5	Third lens	11.826	-71.717	1.440	H-ZLAF68B	1.88300	40.807	-9.741
									6		10.032	9.961	4.960
7	Fourth lens	9.967	-27.389	3.670	TAFD65	2.05090	26.942	60.566
									8		11.071	-20.550	0.408
9	Fifth lens element	11.212	25.633	2.020	E-FDS1-W	1.92286	20.880	27.325
									STO		10.959	Infinity	6.809
11		8.920	Infinity	1.531
									12	Sixth lens element	10.500	18.220	2.820	H-LAK2A	1.69211	54.570	16.948
13		10.500	-31.391	0.100
									14	Seventh lens element	8.933	12.602	0.970	H-ZF52GT	1.84667	23.787	-11.486
15	Eighth lens element	9.200	5.337	2.390	H-LAK53B	1.75500	52.337	14.622
									16		8.400	8.283	1.166
17	Ninth lens	9.200	Infinity	2.760	H-ZPK5	1.59281	68.525	10.330
									18	Tenth lens	9.200	-6.155	0.800	E-FDS1-W	1.92286	20.880	-9.681
19		9.687	-20.299	3.413
									20	Eleventh lens	13.610	21.868	2.900	FDS18-W	1.94595	17.984	15.519
21		13.619	-44.281	2.470
									22	Protective sheet	12.690	Infinity	1.500	H-K9L	1.51680	64.212
23		12.387	Infinity	4.540
									24	Image plane	11.010	Infinity

Fig. 22 is a schematic diagram of an optical path of an optical imaging lens in this embodiment. Referring to fig. 23, it can be seen that when the spatial frequency of the lens reaches 111lp/mm, the full-field transfer function image is still greater than 0.4, the resolution can reach 280 ten thousand pixels, the imaging quality is ensured, the overall static resolution and video resolution of the scheme are greatly improved, and the development of the later-stage image optimization algorithm is greatly facilitated. Please refer to fig. 24, which shows the defocus of the lens under 440nm-640nm, and it can be seen that the defocus of the lens under visible light is small. Please refer to fig. 25 for the vertical axis aberration curve of the lens under the light of 530nm and fig. 26 for the on-axis aberration curve of the lens under the light of 440nm to 640nm, which shows that the field aberration is small, the color reproducibility is good, and the blue-violet edge phenomenon is not obvious. Please refer to fig. 27 for the field curvature and distortion diagram of the lens under 440nm-640nm light, the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the imaging quality is high, and the distortion is not required to be corrected by the later image algorithm. Please refer to fig. 28, it can be seen that the full field of view point diagrams are all smaller than 4um, the geometric point is smaller than 20um, the aberration is small, and the imaging quality is good.

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 are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The large-image-surface athermalized optical imaging lens is characterized by comprising a first lens, a second lens, a third lens and a fourth lens from an object side to an image side in sequence 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 optical imaging lens has only eleven lenses with the refractive index.

2. The large-image-plane athermalized optical imaging lens of claim 1, wherein the image-side surface of the seventh lens element and the object-side surface of the eighth lens element are cemented to each other, and satisfy:

3. The large-image-plane athermal optical imaging lens of claim 1, wherein an image-side surface of said ninth lens element and an object-side surface of said tenth lens element are cemented to each other, and satisfy:

4. The large-image-plane athermal optical imaging lens of claim 1, further comprising an optical stop disposed between said fifth lens and said sixth lens.

5. The large-image-plane athermalized optical imaging lens of claim 1, wherein the temperature coefficients of refractive index dn/dt of the sixth lens element and the ninth lens element are negative.

6. The large-image-plane athermalized optical imaging lens of claim 1, wherein the focal lengths of the first to eleventh lenses and the focal length of the whole lens satisfy the following condition:

4.6＜|(f1/f)|＜4.8， 2.1＜|(f2/f)|＜2.3， 1.2＜|(f3/f)|＜1.3，

7.3＜|(f4/f)|＜9.7， 3.1＜|(f5/f)|＜3.5， 2.1＜|(f6/f)|＜2.4，

1.4＜|(f7/f)|＜1.6， 1.8＜|(f8/f)|＜1.9， 1.2＜|(f9/f)|＜1.4，

1.2＜|(f10/f)|＜1.3， 1.9＜|(f11/f)|＜2，

7. The large-image-plane athermal optical imaging lens of claim 1, wherein the following conditions are satisfied: TTL is less than 57mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.