CN212321969U - Wide-angle low-distortion optical imaging lens - Google Patents

Abstract

The utility model relates to a camera lens technical field. The utility model discloses a wide-angle low-distortion optical imaging lens, which comprises six lenses; the first lens and the second lens are both convex-concave lenses with negative refractive index; the third lens and the sixth lens are both convex lenses with positive refractive index; the fourth lens is a plano-convex lens with positive refractive index, and the fifth lens is a concave-convex lens with negative refractive index; the object side surface and the image side surface of the second lens and the sixth lens are both aspheric surfaces; the second lens and the sixth lens are made of plastic materials, the first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are mutually glued. The utility model has the advantages of short total length, small volume and low cost; the resolution ratio is high, and the imaging quality is good; the field angle is large; distortion management and control are good; small temperature drift.

Description

Wide-angle low-distortion optical imaging lens

Technical Field

The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens of wide angle low distortion.

Background

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

However, the optical imaging lens in the current market has many defects, such as too large optical total length and too many lenses, so that the overall cost of the lens is too high, and the installation and use have limitations; the edge distortion control is poor, so that the shot picture has obvious deformation, and the later image processing is influenced; the field angle is small, the picture capture width by the lens is insufficient, and the requirement of motion picture capture is difficult to meet; the temperature drift amount of the lens is large, and when the temperature disturbance is too large, the imaging quality is influenced; the resolution is low, and the like, which can not meet the increasing requirements of consumers, and the improvement is urgently needed.

Disclosure of Invention

An object of the utility model is to provide an optical imaging lens of low distortion of wide angle is used for solving the technical problem that above-mentioned exists.

In order to achieve the above object, the utility model adopts the following technical scheme: a wide-angle low-distortion optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a fourth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;

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

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

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

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

the object side surface and the image side surface of the second lens and the sixth lens are both aspheric surfaces; the second lens and the sixth lens are made of plastic materials, the first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are mutually glued;

the optical imaging lens has only the first lens element to the sixth lens element with refractive index.

Further, the optical imaging lens further satisfies the following conditions: -6mm < f1< -5mm, -7mm < f2< -5mm, 4mm < f3<5mm, 3mm < f4<4mm, -5mm < f5< -3mm, 7mm < f6<9mm, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, respectively.

Further, the optical imaging lens further satisfies the following conditions: 10mm < R11<15mm, 2mm < R12<5mm, 4mm < R21<6mm, 2mm < R22<4mm, 6mm < R31<8mm, -8mm < R32< -6mm, -3mm < R42< -1mm, -3mm < R51< -1mm, -7mm < R52< -5mm, 7mm < R61<9mm, -8mm < R62< -5mm, wherein, R11 and R12 are curvature radii of the object-side surface and the image-side surface of the first lens element, R21 and R22 are curvature radii of the object-side surface and the image-side surface of the second lens element, R31 and R32 are curvature radii of the object-side surface and the image-side surface of the third lens element, R42 is a curvature radius of the image-side surface of the fourth lens element, R51 and R52 are curvature radii of the object-side surface and the image-side surface of the fifth lens element, and R61 and R62 are curvature radii of the object-side surface and the image-side surface of the sixth lens element, respectively.

Further, the optical imaging lens further satisfies the following conditions: 2< | f1/f | <4, 2< | f2/f | <4, 1< | f3/f | <3, 1< | f4/f | <3, 1< | f5/f | <3, 2< | f6/f | 4, 6< | f45/f | 9, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f45 is the combined focal length of the fourth lens and the fifth lens.

Further, the optical imaging lens further satisfies the following conditions: vd4-vd5>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.

Further, the optical imaging lens further satisfies the following conditions: 1.7< nd1<1.9, 1.8< nd3<2.0, 1.8< nd5<2.0, where nd1, nd3, and nd5 are refractive indices of the first lens, the third lens, and the fifth lens, respectively.

Furthermore, the optical imaging lens further satisfies the following conditions: 40< vd1<50, 1.5< nd2<1.7, 20< vd2<30, 30< vd3<40, 1.7< nd4<1.8, 45< vd4<55, 17< vd5<20, 1.5< nd6<1.7, 50< vd6<60, where nd2, nd4, and nd6 are refractive indices of the second lens, fourth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are abbe indices of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively.

Further, the optical imaging lens further satisfies the following conditions: 1.3mm < SAG21<1.8mm, 1.6mm < SAG22<2mm, where SAG21 and SAG22 are the saggital heights of the object-side and image-side surfaces, respectively, of the second lens.

Further, the object-side surface and the image-side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces.

Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.

The utility model has the advantages of:

the utility model adopts six lenses, and each lens is correspondingly designed, so that the cost is low, the total length is short, the whole volume is small, and the installation and the use are convenient; the distortion control is perfect, the edge deformation of the shot picture is small, and the later image processing is facilitated; the field angle is large, the range of the shot picture is large, and the image resolution is high; the temperature drift is small, and the working state at various temperatures can be well maintained.

Drawings

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

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

FIG. 2 is a graph of MTF of 0.435-0.656 μm in visible light according to the first embodiment of the present invention;

FIG. 3 is a defocus plot of 0.435-0.656 μm visible light according to the first embodiment of the present invention;

fig. 4 is a lateral chromatic aberration graph of visible light of 0.546 μm according to the first embodiment of the present invention;

fig. 5 is a longitudinal aberration curve diagram according to a first embodiment of the present invention;

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

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

FIG. 8 is a graph of MTF of 0.435-0.656 μm in visible light according to embodiment II of the present invention;

fig. 9 is a defocus graph of 0.435-0.656 μm visible light according to the second embodiment of the present invention;

fig. 10 is a lateral chromatic aberration graph of visible light of 0.546 μm according to the second embodiment of the present invention;

fig. 11 is a longitudinal aberration curve chart according to the second embodiment of the present invention;

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

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

FIG. 14 is a graph of MTF of 0.435-0.656 μm in visible light according to the third embodiment of the present invention;

fig. 15 is a defocus graph of 0.435-0.656 μm visible light according to the third embodiment of the present invention;

fig. 16 is a lateral chromatic aberration graph of visible light of 0.546 μm according to the third embodiment of the present invention;

fig. 17 is a longitudinal aberration curve chart according to the third embodiment of the present invention;

fig. 18 is a schematic view of field curvature and distortion curve of a third embodiment of the present invention;

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

fig. 20 is a graph of MTF of 0.435-0.656 μm in visible light according to the fourth embodiment of the present invention;

fig. 21 is a defocus graph of 0.435-0.656 μm visible light according to the fourth embodiment of the present invention;

fig. 22 is a lateral chromatic aberration graph of visible light of 0.546 μm according to the fourth embodiment of the present invention;

fig. 23 is a longitudinal aberration curve diagram according to the fourth embodiment of the present invention;

fig. 24 is a schematic view of field curvature and distortion curve of the fourth embodiment of the present invention;

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

fig. 26 is a graph of MTF of 0.435-0.656 μm in visible light according to embodiment v of the present invention;

fig. 27 is a defocus graph of 0.435-0.656 μm visible light according to embodiment v of the present invention;

fig. 28 is a lateral chromatic aberration graph of visible light of 0.546 μm according to embodiment of the present invention;

fig. 29 is a longitudinal aberration curve chart according to the fifth embodiment of the present invention;

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

Detailed Description

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

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

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

The utility model provides a wide-angle low-distortion optical imaging lens, which comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis in sequence; the first lens element to the sixth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.

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

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

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

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

The object side surface and the image side surface of the second lens and the sixth lens are both aspheric surfaces, and the second lens and the sixth lens are made of plastic materials, so that the optical imaging lens can compensate temperature drift of the base, the influence of temperature disturbance on imaging quality is reduced, and the requirement of keeping the definition of a picture unchanged under the temperature condition of-30-85 ℃ can be met.

The first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are mutually glued; the optical imaging lens has only the first lens element to the sixth lens element with refractive index.

The utility model adopts six lenses, and each lens is correspondingly designed, so that the cost is low, the total length is short, the whole volume is small, and the installation and the use are convenient; the distortion control is perfect, the edge deformation of the shot picture is small, and the later image processing is facilitated; the field angle is large, the range of the shot picture is large, and the image resolution is high; the temperature drift is small, and the working state at various temperatures can be well maintained.

Preferably, the optical imaging lens further satisfies: -6mm < f1< -5mm, -7mm < f2< -5mm, 4mm < f3<5mm, 3mm < f4<4mm, -5mm < f5< -3mm, and 7mm < f6<9mm, wherein f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively, so that the process sensitivity is reduced, and the product yield is improved.

Preferably, the optical imaging lens further satisfies: 10mm < R11<15mm, 2mm < R12<5mm, 4mm < R21<6mm, 2mm < R22<4mm, 6mm < R31<8mm, -8mm < R32< -6mm, -3mm < R42< -1mm, -3mm < R51< -1mm, -7mm < R52< -5mm, 7mm < R61<9mm, -8mm < R62< -5mm, wherein R11 and R12 are radii of curvature of the object side surface and the image side surface, respectively, of the first lens, R21 and R22 are radii of curvature of the object side surface and the image side surface, respectively, of the second lens, R31 and R32 are radii of curvature of the object side surface and the image side surface, respectively, of the third lens, R42 is a radius of curvature of the image side surface, R51 and R5 are radii of the object side surface and the image side surface, respectively, of the fifth lens, and R61 are radii of curvature of the object side surface and the sixth lens, respectively, R57324, easy manufacture, and improved overall performance.

Preferably, the optical imaging lens further satisfies: 2< | f1/f | <4, 2< | f2/f | <4, 1< | f3/f | <3, 1< | f4/f | <3, 1< | f5/f | <3, 2< | f6/f | 4, 6< | f45/f | 9, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f45 is the focal length of the fourth lens combined with the fifth lens, reducing the process and improving the yield of products.

Preferably, the optical imaging lens further satisfies: vd4-vd5>30, wherein vd4 is the abbe number of the fourth lens and vd5 is the abbe number of the fifth lens, further correcting chromatic aberration.

Preferably, the optical imaging lens further satisfies: 1.7< nd1<1.9, 1.8< nd3<2.0, and 1.8< nd5<2.0, wherein nd1, nd3 and nd5 are refractive indexes of the first lens, the third lens and the fifth lens respectively, and the optical imaging lens can be miniaturized well and is beneficial to structural design of the optical imaging lens when combined with the second lens and the sixth lens.

More preferably, the optical imaging lens further satisfies: 40< vd1<50, 1.5< nd2<1.7, 20< vd2<30, 30< vd3<40, 1.7< nd4<1.8, 45< vd4<55, 17< vd5<20, 1.5< nd6<1.7, 50< vd6<60, where nd2, nd4, and nd6 are refractive indices of the second lens, fourth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are dispersion coefficients of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, to further correct chromatic aberration.

Preferably, the optical imaging lens further satisfies: 1.3mm < SAG21<1.8mm, 1.6mm < SAG22<2mm, wherein SAG21 and SAG22 are respectively the rise of the object side surface and the image side surface of the second lens, which is beneficial to distortion correction and good processability.

Preferably, the object-side surface and the image-side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces, which is beneficial to correcting secondary spectrum and high-order aberration.

Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens, so that the overall performance is further improved.

The wide-angle low-distortion optical imaging lens of the present invention will be described in detail with reference to the following specific embodiments.

Example one

As shown in fig. 1, a wide-angle low-distortion 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 stop 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a filter 8, a protective glass 9, and an image plane 10; the first lens element 1 to the sixth lens element 6 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 negative 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 positive refractive index, and an object-side surface 31 of the third lens element 3 is convex and an image-side surface 32 of the third lens element 3 is convex.

The fourth lens element 4 has a positive refractive index, the object-side surface 41 of the fourth lens element 4 is a flat surface, and the image-side surface 42 of the fourth lens element 4 is a convex surface.

The fifth lens element 5 has a negative refractive index, and an object-side surface 51 of the fifth lens element 5 is concave 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 object side surfaces 21, 61 and the image side surfaces 22, 62 of the second lens 2 and the sixth lens 6 are aspheric; the second lens 2 and the sixth lens 6 are made of plastic materials, the first lens 1, the third lens 3, the fourth lens 4 and the fifth lens 5 are made of glass materials, and the fourth lens 4 and the fifth lens 5 are mutually glued.

In other embodiments, the diaphragm 7 may also be arranged between other lenses.

In this embodiment, the filter 8 may be an infrared filter or the like.

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

Table 1-1 detailed optical data for example one

In this embodiment, the object- side surfaces 21, 61 and the image- side surfaces 22, 62 are defined according to the following aspheric curve formula:

wherein:

r is the distance from a point on the optical surface to the optical axis.

z is the rise of this point in the direction of the optical axis.

c is the curvature of the surface.

k is the conic constant of the surface.

A₂、A₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆Respectively as follows: second, fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order aspheric coefficients.

For details of parameters of each aspheric surface, please refer to the following table:

surface of

k

A4

A6

A8

A10

A12

A14

A16

21

0.09

2.515E-02

-3.851E-03

6.471E-04

-6.839E-05

1.968E-06

1.696E-07

-1.098E-08

22

-0.81

4.274E-02

-4.150E-03

9.100E-04

-1.642E-04

-3.224E-05

9.650E-06

-6.543E-07

61

-0.36

-1.298E-03

1.122E-03

-3.697E-04

3.896E-05

2.517E-06

-5.535E-07

1.778E-08

62

-0.65

4.723E-03

2.811E-04

-4.968E-07

-4.594E-05

8.980E-06

-2.628E-07

-2.370E-08

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, the defocusing curve chart is shown in detail in FIG. 3, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, and the imaging quality is excellent; referring to fig. 4 for the lateral chromatic aberration curve, referring to fig. 5 for the longitudinal chromatic aberration, it can be seen that chromatic aberration and aberration correction are better; referring to (A) and (B) of FIG. 6, it can be seen that the curvature of field and distortion are better corrected, and the absolute value of F-Theta distortion is less than 20%.

In this embodiment, the focal length f of the optical imaging lens is 2.15 mm; f-number FNO 2.25; field angle FOV is 120 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 17.00 mm.

The specific embodiment has small temperature drift, can be used at the temperature of-30-85 ℃, and keeps the definition of the picture unchanged.

Example two

As shown in fig. 7, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only 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 2-1.

TABLE 2-1 detailed optical data for example two

For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:

surface of

k

A4

A6

A8

A10

A12

A14

A16

21

0.25

2.568E-02

-3.892E-03

6.438E-04

-6.873E-05

1.938E-06

1.688E-07

-1.031E-08

22

-0.74

4.315E-02

-4.430E-03

8.665E-04

-1.687E-04

-3.104E-05

9.842E-06

-6.643E-07

61

-0.42

-1.389E-03

1.121E-03

-3.754E-04

3.888E-05

2.549E-06

-5.531E-07

1.868E-08

62

0.08

4.796E-03

2.541E-04

3.720E-06

-4.627E-05

8.792E-06

-2.666E-07

-2.008E-08

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. 8, the defocusing curve chart is shown in detail in FIG. 9, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, and the imaging quality is excellent; referring to fig. 10 for the lateral chromatic aberration graph and fig. 11 for the longitudinal chromatic aberration, it can be seen that chromatic aberration and aberration correction are better; referring to (a) and (B) of fig. 12, it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 5%.

In this embodiment, the focal length f of the optical imaging lens is 2.15 mm; f-number FNO 2.25; field angle FOV is 120 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 17.00 mm.

The specific embodiment has small temperature drift, can be used at the temperature of-30-85 ℃, and keeps the definition of the picture unchanged.

EXAMPLE III

As shown in fig. 13, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.

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

TABLE 3-1 detailed optical data for EXAMPLE III

For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:

surface of

k

A4

A6

A8

A10

A12

A14

A16

21

-0.11

2.364E-02

-3.477E-03

5.925E-04

-6.770E-05

2.085E-06

1.569E-07

-9.612E-09

22

-0.78

4.078E-02

-4.016E-03

9.082E-04

-2.314E-04

-3.005E-05

1.233E-05

-9.030E-07

61

-2.37

-1.046E-03

1.047E-03

-3.344E-04

3.087E-05

2.348E-06

-4.228E-07

1.250E-08

62

-1.63

4.289E-03

2.430E-04

-1.400E-06

-4.243E-05

7.964E-06

-2.837E-07

-1.205E-08

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. 14, the defocusing curve chart is shown in detail in FIG. 15, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, and the imaging quality is excellent; referring to fig. 16, the transverse chromatic aberration graph and the longitudinal chromatic aberration graph referring to fig. 17, it can be seen that chromatic aberration and aberration correction are better; referring to fig. 18 (a) and (B), it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 20%.

In this embodiment, the focal length f of the optical imaging lens is 2.15 mm; f-number FNO 2.25; field angle FOV is 120 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 17.00 mm.

The specific embodiment has small temperature drift, can be used at the temperature of-30-85 ℃, and keeps the definition of the picture unchanged.

Example four

As shown in fig. 19, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only 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 4-1.

TABLE 4-1 detailed optical data for example four

For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:

surface of

k

A4

A6

A8

A10

A12

A14

A16

21

-0.35

2.481E-02

-3.724E-03

6.031E-04

-6.749E-05

2.374E-06

1.104E-07

-7.191E-09

22

-0.75

4.195E-02

-4.915E-03

1.045E-03

-2.430E-04

-3.460E-05

1.454E-05

-1.113E-06

61

-2.73

-1.006E-03

1.006E-03

-3.065E-04

2.920E-05

1.988E-06

-3.969E-07

1.512E-08

62

-1.60

4.425E-03

2.536E-04

-1.545E-05

-3.597E-05

7.710E-06

-4.340E-07

3.861E-09

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. 20, the defocusing curve chart is shown in detail in FIG. 21, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, and the imaging quality is excellent; referring to fig. 22 for the lateral chromatic aberration curve, referring to fig. 23 for the longitudinal chromatic aberration, it can be seen that chromatic aberration and aberration correction are better; referring to fig. 24 (a) and (B), it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 20%.

In this embodiment, the focal length f of the optical imaging lens is 2.15 mm; f-number FNO 2.25; field angle FOV is 120 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 17.00 mm.

The specific embodiment has small temperature drift, can be used at the temperature of-30-85 ℃, and keeps the definition of the picture unchanged.

EXAMPLE five

As shown in fig. 25, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.

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

TABLE 5-1 detailed optical data for EXAMPLE V

For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:

surface of

k

A4

A6

A8

A10

A12

A14

A16

21

0.25

2.428E-02

-3.534E-03

5.880E-04

-6.981E-05

2.461E-06

1.621E-07

-1.162E-08

22

-0.82

3.940E-02

-1.358E-03

1.333E-04

-1.530E-04

-1.916E-05

9.371E-06

-7.549E-07

61

0.74

-1.276E-03

1.095E-03

-3.290E-04

3.451E-05

1.862E-06

-4.491E-07

1.625E-08

62

-8.46

4.361E-03

3.189E-04

1.962E-05

-4.996E-05

9.709E-06

-4.190E-07

-1.105E-08

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. 26, the defocusing curve chart is shown in detail in FIG. 27, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, and the imaging quality is excellent; referring to fig. 28, the transverse chromatic aberration graph and the longitudinal chromatic aberration graph refer to fig. 29, which shows that chromatic aberration and aberration correction are better; referring to (A) and (B) of FIG. 30, it can be seen that the curvature of field and distortion are better corrected, and the absolute value of F-Theta distortion is less than 20%.

In this embodiment, the focal length f of the optical imaging lens is 2.15 mm; f-number FNO 2.25; field angle FOV is 120 °; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 17.00 mm.

The specific embodiment has small temperature drift, can be used at the temperature of-30-85 ℃, and keeps the definition of the picture unchanged.

Table 6 values of relevant important parameters of five embodiments of the present 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 (10)

1. The utility model provides an optical imaging lens of low distortion of wide angle which characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;

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

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

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

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

the object side surface and the image side surface of the second lens and the sixth lens are both aspheric surfaces; the second lens and the sixth lens are made of plastic materials, the first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are mutually glued;

the optical imaging lens has only the first lens element to the sixth lens element with refractive index.

2. The wide-angle low-distortion optical imaging lens as claimed in claim 1, further comprising: -6mm < f1< -5mm, -7mm < f2< -5mm, 4mm < f3<5mm, 3mm < f4<4mm, -5mm < f5< -3mm, 7mm < f6<9mm, wherein f1, f2, f3, f4, f5 and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, respectively.

3. The wide-angle low-distortion optical imaging lens as claimed in claim 1, further comprising: 10mm < R11<15mm, 2mm < R12<5mm, 4mm < R21<6mm, 2mm < R22<4mm, 6mm < R31<8mm, -8mm < R32< -6mm, -3mm < R42< -1mm, -3mm < R51< -1mm, -7mm < R52< -5mm, 7mm < R61<9mm, -8mm < R62< -5mm, wherein, R11 and R12 are curvature radii of the object-side surface and the image-side surface of the first lens element, R21 and R22 are curvature radii of the object-side surface and the image-side surface of the second lens element, R31 and R32 are curvature radii of the object-side surface and the image-side surface of the third lens element, R42 is a curvature radius of the image-side surface of the fourth lens element, R51 and R52 are curvature radii of the object-side surface and the image-side surface of the fifth lens element, and R61 and R62 are curvature radii of the object-side surface and the image-side surface of the sixth lens element, respectively.

4. The wide-angle low-distortion optical imaging lens as claimed in claim 1, further comprising: 2< | f1/f | <4, 2< | f2/f | <4, 1< | f3/f | <3, 1< | f4/f | <3, 1< | f5/f | <3, 2< | f6/f | 4, 6< | f45/f | 9, wherein f is the focal length of the optical imaging lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f45 is the combined focal length of the fourth lens and the fifth lens.

5. The wide-angle low-distortion optical imaging lens as claimed in claim 1, further comprising: vd4-vd5>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.

6. The wide-angle low-distortion optical imaging lens as claimed in claim 1, further comprising: 1.7< nd1<1.9, 1.8< nd3<2.0, 1.8< nd5<2.0, where nd1, nd3, and nd5 are refractive indices of the first lens, the third lens, and the fifth lens, respectively.

7. The wide-angle low-distortion optical imaging lens as claimed in claim 6, further comprising: 40< vd1<50, 1.5< nd2<1.7, 20< vd2<30, 30< vd3<40, 1.7< nd4<1.8, 45< vd4<55, 17< vd5<20, 1.5< nd6<1.7, 50< vd6<60, where nd2, nd4, and nd6 are refractive indices of the second lens, fourth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are abbe indices of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively.

8. The wide-angle low-distortion optical imaging lens as claimed in claim 1, further comprising: 1.3mm < SAG21<1.8mm, 1.6mm < SAG22<2mm, where SAG21 and SAG22 are the saggital heights of the object-side and image-side surfaces, respectively, of the second lens.

9. The wide-angle low-distortion optical imaging lens of claim 1, characterized in that: the object side surface and the image side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces.

10. The wide-angle low-distortion optical imaging lens of claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.

Images