CN112505881A

CN112505881A - Confocal optical imaging camera lens of high definition

Info

Publication number: CN112505881A
Application number: CN202011397451.5A
Authority: CN
Inventors: 张军光; 黄波
Original assignee: Xiamen Leading Optics Co Ltd
Current assignee: Xiamen Leading Optics Co Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-03-16

Abstract

The invention relates to the technical field of lenses. The invention discloses a high-definition confocal optical imaging lens which 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 is a convex-concave lens with positive refractive index, the second lens is a convex-concave lens with negative refraction, the third lens is a concave or plano-concave lens with negative refractive index, the fourth lens, the tenth lens and the thirteenth lens are all concave-concave lenses with negative refraction, and the fifth lens, the ninth lens, the eleventh lens, the twelfth lens and the fourteenth lens are all convex-convex lenses with positive refractive index; the sixth lens element has positive refractive index and has a convex object-side surface, the seventh lens element and the eighth lens element are meniscus lenses having positive refractive index, and the fourth lens element and the fifth lens element are cemented with each other; the ninth lens and the tenth lens are mutually glued; the twelfth lens and the thirteenth lens are cemented with each other. The invention has the advantages of large image surface, large field angle, high resolution, large light transmission, correct chromatic aberration and aberration, high imaging quality and no defocusing at high and low temperature.

Description

Confocal optical imaging camera lens of high definition

Technical Field

The invention belongs to the technical field of lenses, and particularly relates to a high-definition confocal optical imaging 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, security monitoring, machine vision, vehicle monitoring and the like, so that the requirements on the optical imaging lenses are higher and higher.

However, the optical imaging lens for motion capture at present has many disadvantages, such as generally small imaging surface, small field angle, and narrow motion range capable of capturing; the single visible light design is mostly used, or the infrared confocal design is realized by using an infrared switching sheet, so that the application has limitation and unreliability; the infrared design is considered, the blue-violet difference of the general visible light is large, the focal shift is large, and the blue-violet edge is easy to appear at the light and dark contrast edge during actual use, so that the algorithm identification is influenced; the clear aperture is generally very small, the contrast value of the imaging edge is very low, and the like, which can not meet the increasing requirements, and the improvement is urgently needed.

Disclosure of Invention

The present invention is directed to provide a high-definition confocal optical imaging lens to solve the above-mentioned problems.

In order to achieve the purpose, the invention adopts the technical scheme that: a high-definition confocal optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fourth lens from an object side to an image side along an optical axis; the first lens element to the fourteenth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;

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 or a plane surface, and a concave image-side surface;

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

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

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

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

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

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

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

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

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

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

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

the fourth lens and the fifth lens are mutually glued; the ninth lens and the tenth lens are mutually glued; the twelfth lens and the thirteenth lens are mutually glued;

the optical imaging lens has only the first lens to the fourteenth lens.

Furthermore, the temperature coefficient of the refractive index of the fourth lens is a positive value, and the temperature coefficient of the refractive index of the fifth lens is a negative value.

Further, the optical imaging lens further satisfies: 20< | vd9-vd10| <55, where vd9 is the abbe number of the ninth lens and vd10 is the abbe number of the tenth lens.

Further, the optical imaging lens further satisfies: 20< | vd12-vd13| <55, where vd12 is the abbe number of the twelfth lens and vd13 is the abbe number of the thirteenth lens.

Further, the optical imaging lens further satisfies: 9< f1/f <12, -4< f2/f < -1, -3< f3/f < -1, -3< f4/f < -1, 1< f5/f <3, 3< f6/f <7, 5< f7/f <11, 10< f8/f <30, 1< f9/f <3, -2< f10/f < -0.5, 1< f11/f <3, 1< f12/f <3, -2< f13/f < -0.5, 1< f14/f <3, wherein f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13 and f14 are respectively a first lens, a second lens, a fifth lens, a sixth lens, a ninth lens, a tenth lens, a sixth lens, a tenth lens, a ninth lens, a tenth lens, a fourth lens, a tenth lens, a ninth lens, a tenth lens, a fourth lens, a ninth lens, a nd, And f is the focal length of the optical imaging lens.

Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the seventh lens and the eighth lens.

Further, the first lens to the fourteenth lens are made of glass materials.

The invention has the beneficial technical effects that:

the invention adopts fourteen lenses, and by correspondingly designing each lens, the image surface is larger, the field angle is large, more sensor image points are covered in the same field angle, the image acquisition details are improved, and the application range is enlarged; the visible-infrared confocal performance is good, an infrared switching piece is not needed, and the blue-violet side color difference is effectively corrected; the aberration optimization is better, particularly the coma optimization; the light transmission is large, and enough imaging brightness can be ensured under the condition of low light; the method has the advantages of good non-thermalization processing and no distortion of an image when the method is used in a high-temperature and low-temperature environment.

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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is an MTF graph of visible light 435-656nm according to the first embodiment of the present invention;

FIG. 3 is a defocus plot of 60lp/mm visible light 435-656nm in the first embodiment of the present invention;

FIG. 4 is a graph of the MTF at 850nm in the infrared according to a first embodiment of the present invention;

FIG. 5 is a 60lp/mm infrared 850nm defocus graph of the first embodiment of the present invention;

FIG. 6 is a Lateral Chromatic Aberration (Lateral Chromatic Aberration) graph according to a first embodiment of the present invention;

FIG. 7 is a comparative plot of 0.546 μm according to a first embodiment of the present invention;

FIG. 8 is a dot-column diagram according to a first embodiment of the present invention;

fig. 9 is a Longitudinal Aberration (Longitudinal Aberration) graph according to the first embodiment of the present invention;

FIG. 10 is a graph illustrating axial chromatic aberration of a 0.707 pupil aperture according to a first embodiment of the present invention;

FIG. 11 is a schematic structural diagram according to a second embodiment of the present invention;

FIG. 12 is an MTF graph of visible light 435-656nm according to the second embodiment of the present invention;

FIG. 13 is a defocus plot of 60lp/mm visible light 435-656nm in example II of the present invention;

FIG. 14 is a graph of the MTF at 850nm in the infrared spectrum of a second embodiment of the present invention;

FIG. 15 is a 60lp/mm infrared 850nm defocus graph of the second embodiment of the present invention;

FIG. 16 is a Lateral Chromatic Aberration (Lateral Chromatic Aberration) graph according to a second embodiment of the present invention;

FIG. 17 is a comparative plot of 0.546 μm for example two of the present invention;

FIG. 18 is a dot diagram according to a second embodiment of the present invention;

FIG. 19 is a Longitudinal Aberration (Longitudinal Aberration) chart according to the second embodiment of the present invention;

FIG. 20 is a graph illustrating the axial chromatic aberration of a pupil aperture of 0.707 according to a second embodiment of the present invention;

FIG. 21 is a schematic structural diagram of a third embodiment of the present invention;

FIG. 22 is an MTF graph of visible light 435-656nm according to a third embodiment of the present invention;

FIG. 23 is a defocus plot of 60lp/mm visible light 435-656nm in example III of the present invention;

FIG. 24 is a graph of the MTF at 850nm in the infrared of example three of the present invention;

FIG. 25 is a 60lp/mm infrared 850nm defocus graph of the third embodiment of the present invention;

FIG. 26 is a Lateral Chromatic Aberration (Lateral Chromatic Aberration) graph according to a third embodiment of the present invention;

FIG. 27 is a comparative plot of 0.546 μm for example three of the present invention;

FIG. 28 is a dot diagram of a third embodiment of the present invention;

fig. 29 is a Longitudinal Aberration (Longitudinal Aberration) graph of the third embodiment of the present invention;

FIG. 30 is a graph showing the axial chromatic aberration of a pupil aperture of 0.707 according to the third embodiment of the present invention;

FIG. 31 is a schematic structural diagram according to a fourth embodiment of the present invention;

FIG. 32 is an MTF graph of visible light 435-656nm according to a fourth embodiment of the present invention;

FIG. 33 is a defocus plot of 60lp/mm visible light 435-656nm of example IV of the present invention;

FIG. 34 is a graph of the MTF at 850nm in the infrared for the fourth example of the present invention;

FIG. 35 is a 60lp/mm infrared 850nm defocus graph of the fourth embodiment of the present invention;

FIG. 36 is a Lateral Chromatic Aberration (Lateral Chromatic Aberration) graph according to a fourth embodiment of the present invention;

FIG. 37 is a comparative plot of 0.546 μm for example four of the present invention;

FIG. 38 is a dot diagram according to a fourth embodiment of the present invention;

FIG. 39 is a Longitudinal Aberration (Longitudinal Aberration) chart according to the fourth embodiment of the present invention;

FIG. 40 is a graph showing the axial chromatic aberration of a pupil aperture of 0.707 according to a fourth embodiment of the present invention;

FIG. 41 is a schematic structural diagram of a fifth embodiment of the present invention;

FIG. 42 is the MTF graph of visible light 435-656nm in the fifth embodiment of the present invention;

FIG. 43 is a defocus plot of 60lp/mm visible light 435-656nm in example V of the present invention;

FIG. 44 is an infrared 850nm MTF plot of example five of the present invention;

FIG. 45 is a 60lp/mm infrared 850nm defocus graph of example five of the present invention;

FIG. 46 is a Lateral Chromatic Aberration (Lateral Chromatic Aberration) graph according to example V of the present invention;

FIG. 47 is a comparative plot of 0.546 μm for example five of the present invention;

FIG. 48 is a dot diagram according to a fifth embodiment of the present invention;

fig. 49 is a Longitudinal Aberration (Longitudinal Aberration) graph according to example five of the present invention;

FIG. 50 is a graph illustrating the axial chromatic aberration of the pupil aperture of 0.707 in accordance with the fifth embodiment of the present invention.

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.

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 invention provides a high-definition confocal optical imaging lens which 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 fourteenth 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 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 or a flat surface, and a concave image-side surface.

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

The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.

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

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

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

The ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.

The tenth lens element with negative refractive power has a concave object-side surface and a concave image-side surface.

The eleventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface.

The twelfth lens element with a positive refractive index has a convex object-side surface and a convex image-side surface.

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

The fourteenth lens element has a positive refractive index, and has a convex object-side surface and a convex image-side surface.

The fourth lens and the fifth lens are mutually glued; the ninth lens and the tenth lens are mutually glued; the twelfth lens and the thirteenth lens are cemented with each other.

The optical imaging lens has only the first lens to the fourteenth lens. The invention adopts fourteen lenses, and by correspondingly designing each lens, the image surface is larger, the field angle is large, more sensor image points are covered in the same field angle, the image acquisition details are improved, and the application range is enlarged; the visible-infrared confocal property is good, an infrared switching piece is not needed, the blue-violet chromatic aberration is effectively corrected, and the blue-violet chromatic shift of the aperture of a pupil of 0.707 is controlled within 10 mu m, so that the picture can not have obvious blue-violet chromatic aberration at the edge of light and shade alternation; the aberration optimization is better, particularly the coma optimization; the light transmission is large, and enough imaging brightness can be ensured under the condition of low light; the method has the advantages of no thermal treatment, and no distortion of image when used in a temperature range of-40 ℃ to 85 ℃.

Preferably, the temperature coefficient of the refractive index of the fourth lens is a positive value, the temperature coefficient of the refractive index of the fifth lens is a negative value, temperature drift is further controlled, and when the temperature-controlled optical lens is used within a temperature range of-40 ℃ to 85 ℃, a clear picture can be ensured without defocusing.

Preferably, the optical imaging lens further satisfies: 20< | vd9-vd10| <55, wherein vd9 is the abbe number of the ninth lens, and vd10 is the abbe number of the tenth lens, so that the wide spectrum chromatic aberration of the lenses is better corrected, and the color reducibility of visible light imaging images is improved.

Preferably, the optical imaging lens further satisfies: 20< | vd12-vd13| <55, wherein vd12 is the abbe number of the twelfth lens, and vd13 is the abbe number of the thirteenth lens, so that the wide spectrum chromatic aberration of the lenses is better corrected, and the color reducibility of visible light imaging images is improved.

Preferably, the optical imaging lens further satisfies: 9< f1/f <12, -4< f2/f < -1, -3< f3/f < -1, -3< f4/f < -1, 1< f5/f <3, 3< f6/f <7, 5< f7/f <11, 10< f8/f <30, 1< f9/f <3, -2< f10/f < -0.5, 1< f11/f <3, 1< f12/f <3, -2< f13/f < -0.5, 1< f14/f <3, wherein f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13 and f14 are respectively a first lens, a second lens, a fifth lens, a sixth lens, a ninth lens, a tenth lens, a sixth lens, a tenth lens, a ninth lens, a tenth lens, a fourth lens, a tenth lens, a ninth lens, a tenth lens, a fourth lens, a ninth lens, a nd, The focal lengths of the twelfth lens, the thirteenth lens and the fourteenth lens are f, the focal length of the optical imaging lens is f, the focal lengths of the lenses are reasonably distributed, the sensitivity of the optical lens to each tolerance is reduced, and the production yield of the optical lens is further improved.

Preferably, the optical lens further comprises a diaphragm, and the diaphragm is arranged between the seventh lens and the eighth lens, so that the overall performance is further improved.

Preferably, the first lens, the second lens, the third lens and the fourth lens are made of glass materials, the material characteristics are stable, the lens can still work well when being used in an extreme environment, the processing and the manufacturing are easy, the cost is low, and the feasibility of industrial mass production is realized.

The high-definition confocal optical imaging lens of the present invention will be described in detail with specific embodiments.

Example one

As shown in fig. 1, a high-definition confocal optical imaging lens includes, in order from an object side a1 to an image side a2 along an optical axis I, 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, a stop 150, an eighth lens 8, a ninth lens 9, a tenth lens 100, an eleventh lens 110, a twelfth lens 120, a thirteenth lens 130, a fourteenth lens 140, a protective glass 160, and an imaging surface 170; the first lens element 1 to the fourteenth lens element 140 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 a positive refractive index, and an object-side surface 11 of the first lens element 1 is convex and an image-side surface 12 of the first lens element 1 is concave.

The second lens element 2 has a negative refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is concave.

The third lens element 3 has a negative refractive index, and an object-side surface 31 of the third lens element 3 is concave and an image-side surface 32 of the third lens element 3 is concave.

The fourth lens element 4 has a negative refractive index, and an object-side surface 41 of the fourth lens element 4 is concave and an image-side surface 42 of the fourth lens element 4 is concave.

The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is convex and an image-side surface 52 of the fifth lens element 5 is convex.

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

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

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 ninth lens element 9 has a positive refractive index, and an object-side surface 91 of the ninth lens element 9 is convex and an image-side surface 92 of the ninth lens element 9 is convex.

The tenth lens element 100 has a negative refractive index, and an object-side surface 101 of the tenth lens element 100 is concave and an image-side surface 102 of the tenth lens element 100 is concave.

The eleventh lens element 110 has a positive refractive index, and an object-side surface 111 of the eleventh lens element 110 is convex and an image-side surface 112 of the eleventh lens element 110 is convex.

The twelfth lens element 120 has a positive refractive index, and an object-side surface 121 of the twelfth lens element 120 is convex and an image-side surface 122 of the twelfth lens element 120 is convex.

The thirteenth lens element 130 has a negative refractive index, and the object-side surface 131 of the thirteenth lens element 130 is concave and the image-side surface 132 of the thirteenth lens element 130 is concave.

The fourteenth lens element 140 has a positive refractive index, and an object-side surface 141 of the fourteenth lens element 140 is convex and an image-side surface 142 of the fourteenth lens element 140 is convex.

The fourth lens 4 and the fifth lens 5 are mutually glued; the ninth lens 9 and the tenth lens 100 are cemented with each other; the twelfth lens 120 and the thirteenth lens 130 are cemented with each other.

In this embodiment, the temperature coefficient of refractive index of the fourth lens element 4 is a positive value, and the temperature coefficient of refractive index of the fifth lens element 5 is a negative value.

In the present embodiment, the diaphragm 150 is disposed between the seventh lens 7 and the eighth lens 8, but the present invention is not limited thereto, and in other embodiments, the diaphragm 150 may be disposed at other suitable positions.

In this embodiment, the first lens 1 to the fourteenth lens 140 are made of a glass material, but not limited thereto, and in other embodiments, the first lens 1 to the fourteenth lens 140 may also be made of other materials such as plastics.

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 curve chart of the specific embodiment is shown in detail in fig. 2 and 4, the defocusing curve chart is shown in detail in fig. 3 and 5, and it can be seen that within a broad spectral range of 435 nm-850 nm, the visible-infrared confocal performance is good, an infrared switching sheet is not needed, so that the lens has equal and high-quality imaging quality in visible and infrared light wave bands; the transverse chromatic aberration curve diagram refers to fig. 6, the dot-column diagram refers to fig. 8, the longitudinal chromatic aberration refers to fig. 9, the axial chromatic aberration curve diagram refers to fig. 10 in detail, it can be seen that chromatic aberration and aberration are both corrected well, imaging quality is good, blue-violet chromatic aberration is eliminated perfectly, blue-violet side focal shift of 0.707 pupil aperture is controlled within 10 μm, and the picture does not have obvious blue-violet side chromatic aberration at the edge of light and shade alternation; the relative illuminance is seen in greater detail in fig. 7, which shows that the relative illuminance is high.

When the working temperature is in the environment of high and low temperature of-25 ℃ to +85 ℃, the temperature drift amount is small, the focusing is carried out at normal temperature, and the high and low temperature is not easy to be burnt.

In this embodiment, the focal length f of the optical imaging lens is 8.82 mm; the field angle FOV is 85.0 °; the f-number FNO is 2.0; the diameter phi of the image plane is 25.4 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 170 on the optical axis I is 108.34 mm.

Carry out two

As shown in fig. 11, in this embodiment, the surface convexoconcave and the refractive index of each lens element are substantially the same as those of the first embodiment, only the object-side surface 31 of the third lens element 3 is a flat surface, and the image-side surface 62 of the sixth lens element 6 is a concave 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 2-1.

TABLE 2-1 detailed optical data for example two

The MTF transfer function curve chart of the specific embodiment is shown in detail in fig. 12 and 14, the defocus curve chart is shown in detail in fig. 13 and 15, it can be seen that within a broad spectral range of 435 nm-850 nm, the visible-infrared confocal property is good, and an infrared switching sheet is not needed, so that the lens has equal and high-quality imaging quality in visible and infrared bands; as shown in fig. 16, fig. 18 is a graph of transverse chromatic aberration, fig. 19 is a graph of dot-column diagram, fig. 20 is a graph of longitudinal chromatic aberration, and as shown in detail in fig. 20, it can be seen that chromatic aberration and aberration are both corrected well, imaging quality is good, blue-violet chromatic aberration is eliminated perfectly, blue-violet side focal shift of 0.707 pupil aperture is controlled within 10 μm, and the picture does not have obvious blue-violet side chromatic aberration at the edge of light and shade alternation; the relative illuminance is seen in greater detail in fig. 17, which shows that the relative illuminance is high.

In this embodiment, the focal length f of the optical imaging lens is 8.82 mm; the field angle FOV is 85.0 °; the f-number FNO is 2.0; the diameter phi of the image plane is 25.4 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 170 on the optical axis I is 108.35 mm.

Implementation III

As shown in fig. 21, the surface-type convexo-concave shapes and the refractive indexes of the lenses of the present embodiment and the first embodiment are substantially the same, only the image-side surface 62 of the sixth lens element 6 is a concave surface, and the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.

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 curve diagram of the specific embodiment is shown in detail in fig. 22 and 24, the defocus curve diagram is shown in detail in fig. 23 and 25, it can be seen that within a broad spectral range of 435 nm-850 nm, the visible-infrared confocal property is good, and an infrared switching sheet is not needed, so that the lens has equal and high-quality imaging quality in visible and infrared bands; referring to fig. 26 for a transverse chromatic aberration graph, referring to fig. 28 for a dot-column graph, referring to fig. 29 for a longitudinal chromatic aberration graph, referring to fig. 30 for an axial chromatic aberration graph, it can be seen that chromatic aberration and aberration are both corrected well, imaging quality is good, blue-violet chromatic aberration is eliminated perfectly, blue-violet edge focal shift of 0.707 pupil aperture is controlled within 10 μm, so that the picture does not have obvious blue-violet edge chromatic aberration at the edge of light and shade alternation; the relative illuminance curve is detailed in fig. 27, and it can be seen that the relative illuminance is high.

In this embodiment, the focal length f of the optical imaging lens is 8.80 mm; the field angle FOV is 85.0 °; the f-number FNO is 2.0; the diameter phi of the image plane is 25.4 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 170 on the optical axis I is 108.24 mm.

Practice four

As shown in fig. 31, in this embodiment, the surface convexoconcave and the refractive index of each lens element are substantially the same as those of the first embodiment, only the object-side surface 31 of the third lens element 3 is a flat surface, and the image-side surface 62 of the sixth lens element 6 is a concave 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 4-1.

TABLE 4-1 detailed optical data for example four

The MTF transfer function graph of the specific embodiment is shown in detail in fig. 32 and 34, and the defocus graph is shown in detail in fig. 33 and 35, so that the visible-infrared confocal performance is good in a broad spectral range of 435 nm-850 nm, and an infrared switching sheet is not needed, so that the lens has equal and high-quality imaging quality in visible and infrared bands; the transverse chromatic aberration curve please refer to fig. 36, the dot-column diagram please refer to fig. 38, the longitudinal chromatic aberration curve please refer to fig. 39, the axial chromatic aberration curve please refer to fig. 40, it can be seen that chromatic aberration and aberration are both corrected well, imaging quality is good, blue-violet chromatic aberration is eliminated perfectly, blue-violet side focal shift of 0.707 pupil aperture is controlled within 10 μm, so that the picture will not have obvious blue-violet side chromatic aberration at the edge of light and shade alternation; the relative illuminance is seen in detail in fig. 37, which shows that the relative illuminance is high.

In this embodiment, the focal length f of the optical imaging lens is 8.80 mm; the field angle FOV is 85.0 °; the f-number FNO is 2.0; the diameter phi of the image plane is 25.4 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 170 on the optical axis I is 108.43 mm.

Practice five

As shown in fig. 41, in this embodiment, the surface convexoconcave and the refractive index of each lens element are substantially the same as those of the first embodiment, only the object-side surface 31 of the third lens element 3 is a flat surface, the image-side surface 62 of the sixth lens element 6 is a flat surface, and 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 curve chart of the specific embodiment is shown in detail in fig. 42 and 44, the defocus curve chart is shown in detail in fig. 43 and 45, and it can be seen that the visible-infrared confocal performance is good in a broad spectral range of 435 nm-850 nm, and an infrared switching sheet is not needed, so that the lens has equal and high-quality imaging quality in visible and infrared bands; the transverse chromatic aberration curve please refer to fig. 46, the dot-column curve please refer to fig. 48, the longitudinal chromatic aberration curve please refer to fig. 49, the axial chromatic aberration curve please refer to fig. 50, it can be seen that chromatic aberration and aberration are both corrected well, imaging quality is good, blue-violet chromatic aberration is eliminated perfectly, blue-violet side focal shift of 0.707 pupil aperture is controlled within 10 μm, so that the picture will not have obvious blue-violet side chromatic aberration at the edge of light and shade alternation; the relative illuminance curve is detailed in fig. 47, and it can be seen that the relative illuminance is high.

In this embodiment, the focal length f of the optical imaging lens is 8.81 mm; the field angle FOV is 85.0 °; the f-number FNO is 2.0; the diameter phi of the image plane is 25.4 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 170 on the optical axis I is 108.79 mm.

TABLE 6 values of relevant important parameters for five embodiments of the invention

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 confocal optical imaging lens of high definition which characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side along an optical axis; the first lens element to the fourteenth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;

the optical imaging lens has only the first lens to the fourteenth lens.

2. The high-definition confocal optical imaging lens according to claim 1, characterized in that: the temperature coefficient of the refractive index of the fourth lens is a positive value, and the temperature coefficient of the refractive index of the fifth lens is a negative value.

3. The high-definition confocal optical imaging lens according to claim 1, characterized in that the optical imaging lens further satisfies: 20< | vd9-vd10| <55, where vd9 is the abbe number of the ninth lens and vd10 is the abbe number of the tenth lens.

4. The high-definition confocal optical imaging lens according to claim 1, characterized in that the optical imaging lens further satisfies: 20< | vd12-vd13| <55, where vd12 is the abbe number of the twelfth lens and vd13 is the abbe number of the thirteenth lens.

5. The high-definition confocal optical imaging lens according to claim 1, characterized in that the optical imaging lens further satisfies: 9< f1/f <12, -4< f2/f < -1, -3< f3/f < -1, -3< f4/f < -1, 1< f5/f <3, 3< f6/f <7, 5< f7/f <11, 10< f8/f <30, 1< f9/f <3, -2< f10/f < -0.5, 1< f11/f <3, 1< f12/f <3, -2< f13/f < -0.5, 1< f14/f <3, wherein f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, f11, f12, f13 and f14 are respectively a first lens, a second lens, a fifth lens, a sixth lens, a ninth lens, a tenth lens, a sixth lens, a tenth lens, a ninth lens, a tenth lens, a fourth lens, a tenth lens, a ninth lens, a tenth lens, a fourth lens, a ninth lens, a nd, And f is the focal length of the optical imaging lens.

6. The high-definition confocal optical imaging lens according to claim 1, characterized in that: the diaphragm is arranged between the seventh lens and the eighth lens.

7. The high-definition confocal optical imaging lens according to claim 1, characterized in that: the first lens to the fourteenth lens are made of glass materials.