CN109581620B - Optical lens - Google Patents

Abstract

The present application discloses an optical lens, which sequentially comprises, from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens can have negative focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens and the third lens can have positive focal power, and both the object side surface and the image side surface of the second lens and the third lens can be convex surfaces; the fourth lens may have a positive optical power; the fifth lens may have a negative optical power; and the sixth lens element can have a positive power, and can have a concave object-side surface and a convex image-side surface.

Description

Optical lens

Technical Field

The present application relates to an optical lens, and more particularly, to an optical lens including six lenses.

Background

With the development of technology, the pixel requirement of the vehicle-mounted lens is higher and higher, and the size of the chip is increased, so that the size of the whole optical lens is increased. This is disadvantageous in terms of miniaturization of the lens barrel and causes an increase in manufacturing cost.

However, for some applications with limited mounting locations, a small size lens is required to meet the mounting requirements. For example, an on-board lens that needs to be installed inside a windshield needs to be designed to meet the requirements of small front-end aperture and small size due to the risk of interference with the windshield and the limitation of installation location.

Disclosure of Invention

The present application provides an optical lens that is adaptable for on-board installation and that overcomes, at least in part, at least one of the above-identified deficiencies in the prior art.

An aspect of the present application provides an optical lens that may include, in order from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens can have negative focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens and the third lens can have positive focal power, and both the object side surface and the image side surface of the second lens and the third lens can be convex surfaces; the fourth lens may have a positive optical power; the fifth lens may have a negative optical power; and the sixth lens element can have a positive power, and can have a concave object-side surface and a convex image-side surface.

Another aspect of the present application provides an optical lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens can have negative focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens, the third lens and the fourth lens can all have positive focal power; the fifth lens may have a negative optical power; the sixth lens element can have a positive optical power, and can have a concave object-side surface and a convex image-side surface, wherein a distance between an object-side surface curvature radius R31 and an image-side surface curvature radius R32 of the third lens element satisfies: and the | R31/R32| is more than or equal to 2.

In one embodiment, both the object-side surface and the image-side surface of the fourth lens can be convex.

In one embodiment, both the object-side surface and the image-side surface of the fifth lens may be concave.

In one embodiment, the third lens may be a glass spherical lens.

In one embodiment, at least one of the second lens and the sixth lens may be an aspherical mirror.

In one embodiment, the object side surface and the image side surface of the second lens and the third lens may be both convex surfaces.

In one embodiment, the fourth lens and the fifth lens may be cemented to constitute a cemented lens.

In one embodiment, the optical lens may further include a stop disposed between the second lens and the third lens.

In one embodiment, a distance TTL between a center of an object side surface of the first lens element and an imaging surface of the optical lens on an optical axis and a full-group focal length value F of the optical lens may satisfy: TTL/F is more than or equal to 2.5 and less than or equal to 5.5.

In one embodiment, a distance TTL from a center of an object-side surface of the first lens to an imaging surface of the optical lens on the optical axis, a maximum field angle FOV of the optical lens, and an image height h corresponding to the maximum field angle of the optical lens may satisfy: TTL/h/FOV is less than or equal to 0.03.

In one embodiment, the maximum field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum field angle of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens may satisfy: D/h/FOV is less than or equal to 0.015.

In one embodiment, the third lens may have an object-side radius of curvature R31 and an image-side radius of curvature R32 that satisfy: and the | R31/R32| is more than or equal to 2.

In one embodiment, the second lens may be a plastic lens, and a focal length value F2 of the second lens and a focal length value F of the entire group of the optical lens may satisfy: F2/F is more than or equal to 1.5 and less than or equal to 4.5.

In one embodiment, the sixth lens is a plastic lens, and a focal length value F6 of the sixth lens and a focal length value F of the entire group of the optical lens satisfy: F6/F is more than or equal to 3 and less than or equal to 6.

The optical lens system adopts six lenses, for example, the shapes of the lenses are optimally set, the third lens is further designed into a biconvex shape, the focal power of each lens is reasonably distributed, the cemented lens is formed, the beneficial effects of miniaturization, small front-end caliber, high pixel and large field angle of the optical lens are realized, and the purposes of reducing the lens aberration of the optical system, improving the imaging quality and matching a large chip are realized.

Drawings

Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic view showing a structure of an optical lens according to embodiment 1 of the present application;

fig. 2 is a schematic structural view showing an optical lens according to embodiment 2 of the present application; and

fig. 3 is a schematic view showing a structure of an optical lens according to embodiment 3 of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens, and the first cemented lens may also be referred to as the second cemented lens, without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the image plane is called the image side surface.

It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

The features, principles, and other aspects of the present application are described in detail below.

An optical lens according to an exemplary embodiment of the present application includes, for example, six lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged in order from the object side to the image side along the optical axis.

The optical lens according to the exemplary embodiment of the present application may further include a photosensitive element disposed on the image plane. Alternatively, the photosensitive element provided to the imaging surface may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS).

The first lens element can have a negative power, and can have a convex object-side surface and a concave image-side surface. The first lens can collect light rays with a large field of view as much as possible and make the collected light rays enter the rear optical system. In practical application, considering the outdoor installation and use environment of the vehicle-mounted lens, the vehicle-mounted lens can be in severe weather such as rain and snow, the first lens is arranged in the meniscus shape with the convex surface facing the object side, so that water drops and the like can slide off, and the influence on the imaging quality of the lens is reduced.

The second lens can have positive optical power, and both the object side surface and the image side surface of the second lens can be convex. The second lens can compress the light collected by the first lens, so that the light trend is smoothly transited to the rear optical system.

The third lens element can have a positive optical power, and both the object-side surface and the image-side surface can be convex. The third lens can converge light, so that the diffused light can smoothly enter the rear optical system, and the total optical length can be reduced. The convex arrangement of the object side surface can reduce the spherical aberration introduced into the rear optical system, thereby reducing the aberration correction pressure of the rear lens.

The fourth lens may have a positive optical power.

The fifth lens may have a negative optical power.

The sixth lens element can have a positive optical power, and can have a concave object-side surface and a convex image-side surface. The sixth lens is a convergent lens, so that light can be smoothly incident to the surface of the chip of the imaging surface, and the relative illumination performance of the system is improved. The sixth lens can increase the back focus of the optical system, meet the requirement of long working distance, keep the size of the lens from increasing under the condition of the same FOV requirement, realize the enlargement of an image plane, and facilitate the matching of a large chip.

As known to those skilled in the art, cemented lenses may be used to minimize or eliminate chromatic aberration. The use of the cemented lens in the optical lens can improve the image quality and reduce the reflection loss of light energy, thereby improving the imaging definition of the lens. In addition, the use of the cemented lens can also simplify the assembly process in the lens manufacturing process.

In an exemplary embodiment, the fourth lens and the fifth lens may be combined into a cemented lens by cementing the image-side surface of the fourth lens with the object-side surface of the fifth lens. By introducing the cemented lens consisting of the fourth lens and the fifth lens, the chromatic aberration influence can be eliminated, and the tolerance sensitivity of the system is reduced; meanwhile, the cemented fourth lens and fifth lens may also have a residual partial chromatic aberration to balance the entire chromatic aberration of the optical system. The gluing of the fourth lens and the fifth lens omits the air space between the fourth lens and the fifth lens, so that the optical system is compact as a whole and meets the requirement of system miniaturization. Moreover, the gluing of the fourth lens and the fifth lens can reduce tolerance sensitivity problems of inclination/decentration and the like of the lens unit caused in the assembling process.

In an exemplary embodiment, a stop for limiting the light beam may be disposed between, for example, the second lens and the third lens to further improve the imaging quality of the lens. When the diaphragm is arranged between the second lens and the third lens, the light beams passing through the second lens and the third lens can be collected, the calibers of the front lens group and the rear lens group of the lens can be reduced, the total length of the optical system can be shortened, and the miniaturization characteristic can be realized.

In the cemented lens, the fourth lens close to the object side has positive focal power, and the fifth lens close to the image side has negative focal power, so that the arrangement is favorable for further converging front rays and then transferring the front rays to the sixth lens, is favorable for reducing the optical path of rear rays, reducing the rear port diameter/size of the lens and shortening the total length of an optical system so as to realize short TTL and realize miniaturization.

In an exemplary embodiment, 2.5 ≦ TTL/F ≦ 5.5 may be satisfied between an optical total length TTL of the optical lens (i.e., a distance on the optical axis from the center of the object side surface of the first lens to the imaging surface of the optical lens) and the entire group focal length value F of the optical lens, and more specifically, TTL and F may further satisfy 3.7 ≦ TTL/F ≦ 4.4. The TTL/F is more than or equal to 2.5 and less than or equal to 5.5, and the miniaturization characteristic of the lens can be realized.

In an exemplary embodiment, the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens, and the image height h corresponding to the maximum field angle of the optical lens may satisfy: TTL/h/FOV ≦ 0.03, and more specifically, TTL, h, and FOV may further satisfy TTL/h/FOV ≦ 0.025. The optical total length TTL can be shorter under the same imaging surface under the condition that the TTL/h/FOV is less than or equal to 0.03.

In an exemplary embodiment, D/h/FOV ≦ 0.015 may be satisfied between the maximum field of view angle FOV of the optical lens, the maximum clear aperture D of the object side surface of the first lens corresponding to the maximum field of view angle of the optical lens, and the image height h corresponding to the maximum field of view angle of the optical lens, and more particularly, D, h and FOV may further satisfy D/h/FOV ≦ 0.009. The requirement of the conditional expression D/h/FOV is less than or equal to 0.015, and the small caliber at the front end can be ensured.

In an exemplary embodiment, the object side radius of curvature R31 and the image side radius of curvature R32 of the third lens of the optical lens may satisfy: the ratio of R31/R32 is more than or equal to 2, and more specifically, R31 and R32 can further satisfy the relation of R31/R32 to be more than or equal to 3.4. The condition of | R31/R32| ≧ 2 is met, large aperture and small FNO of the optical lens can be guaranteed, so that light rays enter a rear optical system as much as possible, and night vision of the optical lens is facilitated.

In an exemplary embodiment, at least one of the second lens and the sixth lens may be arranged as an aspherical mirror. The aspheric lens has the characteristics that: the curvature varies continuously from the center of the lens to the periphery. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved.

At least one of the second lens, the third lens and the sixth lens in the optical lens may be a plastic lens, or a glass lens. Because the thermal expansion coefficient of the lens made of plastic is large, when the ambient temperature change of the lens is large, the lens made of plastic has a large influence on the overall performance of the lens. And the glass lens can reduce the influence of temperature on the performance of the lens. In use, at least one of the second lens, the third lens and the sixth lens may be arranged as a glass lens, so that the optical lens has good temperature stability but is high in cost. Optionally, the second lens and the sixth lens can be arranged as a plastic lens. Because the lens of plastics material has great influence to optical lens's wholeness ability, consequently, need carry out rational distribution and optimization to the focus of lens of plastics material in the application to be favorable to the holistic thermal compensation of system to reduce. For example, 1.5. ltoreq. F2/F. ltoreq.4.5, and further 2.7. ltoreq. F2/F. ltoreq.3.6 may be satisfied between the focal length F2 of the second lens and the total focal length F of the optical lens. The focal length F6 of the sixth lens element and the total focal length F of the optical lens can satisfy the relationship of F6/F less than or equal to 6, and further satisfy the relationship of F6/F less than or equal to 5.2 less than or equal to 3.6. Through the reasonable distribution of the focal length, the temperature performance of the lens system can be effectively improved, so that the total length of the lens is shortened as far as possible while the perfect resolution of the lens is ensured in a larger temperature range.

The optical lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. Through optimizing the focal power and the surface type of each lens of the optical lens and reasonably using the cemented lens, the optical lens has shorter total optical length TTL under the same imaging surface, small front port diameter, high pixel application and increased field angle, so that the lens has better imaging quality and clear images, the risk of software misjudgment is reduced, and the lens can better meet the requirements of a vehicle-mounted lens.

However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although six lenses are exemplified in the embodiment, the optical lens is not limited to including six lenses. The optical lens may also include other numbers of lenses, if desired.

Specific examples of an optical lens applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An optical lens according to embodiment 1 of the present application is described below with reference to fig. 1. Fig. 1 shows a schematic structural diagram of an optical lens according to embodiment 1 of the present application.

As shown in fig. 1, the optical lens includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.

The second lens L2 is a biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The second lens L2 is an aspherical lens.

The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7.

The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S9 and a concave image-side surface S10. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being concave and the image side S12 being convex. The sixth lens L6 is an aspherical lens.

Optionally, the optical lens may further include a filter L7 and/or a protective lens L7' having an object side S13 and an image side S14. Filter L7 can be used to correct for color deviations. The protective lens L7' may be used to protect the image sensing chip on the imaging plane IMA. Light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging plane IMA.

In the optical lens of the present embodiment, a stop STO may be provided between the second lens L2 and the third lens L3 to improve the imaging quality.

Table 1 shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 1, where the radius of curvature R and the thickness T are both in units of millimeters (mm).

TABLE 1

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	25.0000	0.8424	1.80	46.57
2	2.7130	2.0783
					3	14.9105	1.6847	1.62	23.53
4	-19.3740	1.1785
					STO	All-round	-0.0282
6	14.4743	1.4444	1.52	64.21
					7	-4.1362	0.0936
8	7.1054	2.0747	1.72	46.00
					9	-5.0226	0.5616	1.85	23.78
10	6.4316	0.7002
					11	-105.7496	1.4763	1.53	56.07
12	-9.2061	0.9347
					13	All-round	0.8892	1.52	64.21
14	All-round	4.0989
					IMA	All-round

The present embodiment adopts six lenses as an example, and by reasonably distributing the focal power and the surface type of each lens, the center thickness of each lens and the air space between each lens, the lens can realize the effects of reducing the total optical length and expanding the field angle while ensuring a large imaging size and high pixels. Each aspherical surface type Z is defined by the following formula:

wherein Z is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient conc; A. b, C, D, E are all high order term coefficients. Table 2 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S11, and S12 in example 1.

TABLE 2

Flour mark

K

A

B

C

D

E

3

-13.2717

-6.3116E-04

8.2868E-05

3.8797E-05

-6.0684E-06

8.4059E-06

4

-78.5845

-1.6259E-03

6.3287E-04

3.8748E-07

-1.1323E-05

2.1456E-06

11

2956.3270

-4.2407E-03

-3.8601E-04

6.4627E-06

-4.8466E-06

4.4030E-07

12

-85.5569

-1.0411E-02

2.1450E-03

-3.5833E-04

3.2468E-05

-1.1665E-06

Table 3 below gives the total optical length TTL of the optical lens of example 1 (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S15), the entire group focal length value F of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum angle of view of the optical lens, the image height h corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the focal length value F2 of the second lens of the optical lens, and the focal length value F6 of the sixth lens of the optical lens.

TABLE 3

Parameter(s)	TTL(mm)	F(mm)	D(mm)	h(mm)
					Numerical value	18.029	4.819	6.013	8.082
Parameter(s)	FOV(°)	F2(mm)	F6(mm)
					Numerical value	92	13.850	18.762

In the present embodiment, TTL/F is 3.741 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the total optical length TTL of the optical lens, the maximum view field angle FOV of the optical lens and the image height h corresponding to the maximum view field angle of the optical lens meet the condition that TTL/h/FOV is 0.024; D/h/FOV is 0.008 when the maximum field angle FOV of the optical lens, the maximum light-transmitting caliber D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens and the image height h corresponding to the maximum field angle of the optical lens are met; F2/F2.874 is satisfied between the focal length value F2 of the second optical lens L2 and the focal length value F of the entire group of optical lenses; F6/F3.893 is satisfied between the focal length value F6 of the sixth optical lens L6 and the focal length value F of the entire group of the optical lenses; and the radius of curvature R31 of the object-side surface of the optical lens third lens L3 and the radius of curvature R32 of the image-side surface thereof satisfy | R31/R32| -3.499.

Example 2

An optical lens according to embodiment 2 of the present application is described below with reference to fig. 2. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 2 shows a schematic structural diagram of an optical lens according to embodiment 2 of the present application.

As shown in fig. 2, the optical lens includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.

The second lens L2 is a biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The second lens L2 is an aspherical lens.

The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7.

The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S9 and a concave image-side surface S10. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being concave and the image side S12 being convex. The sixth lens L6 is an aspherical lens.

Optionally, the optical lens may further include a filter L7 and/or a protective lens L7' having an object side S13 and an image side S14. Filter L7 can be used to correct for color deviations. The protective lens L7' may be used to protect the image sensing chip on the imaging plane IMA. Light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging plane IMA.

In the optical lens of the present embodiment, a stop STO may be provided between the second lens L2 and the third lens L3 to improve the imaging quality.

Table 4 below shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 2, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 5 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S11, and S12 in example 2. Table 6 below gives the total optical length TTL of the optical lens of example 2 (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S15), the entire group focal length value F of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum angle of view of the optical lens, the image height h corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the focal length value F2 of the second lens of the optical lens, and the focal length value F6 of the sixth lens of the optical lens.

TABLE 4

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	30.0000	0.8038	1.80	46.57
2	2.5720	2.0720
					3	15.1005	1.6076	1.64	23.53
4	-17.5071	1.1569
					STO	All-round	-0.0269
6	14.3447	1.6076	1.49	64.21
					7	-3.9383	0.0893
8	6.7609	1.9831	1.74	44.90
					9	-4.6232	0.6000	1.88	21.00
10	6.2866	0.6512
					11	-228.1363	1.4087	1.53	56.07
12	-8.6830	0.8919
					13	All-round	0.7500	1.52	64.21
14	All-round	4.6261
					IMA	All-round

TABLE 5

Flour mark

K

A

B

C

D

E

3

0.7694

-4.2167E-04

2.2145E-04

7.0628E-05

-7.9875E-06

1.2849E-06

4

-98.4073

-1.5884E-03

8.8540E-04

1.3101E-05

-1.4859E-05

3.8036E-06

11

735.5719

-5.0369E-03

-4.8770E-04

1.3934E-05

-5.5397E-06

5.3376E-06

12

-84.1817

-1.2385E-02

2.6957E-03

-4.9612E-04

4.9745E-05

-1.9262E-06

TABLE 6

Parameter(s)	TTL(mm)	F(mm)	D(mm)	h(mm)
					Numerical value	18.221	4.641	8.960	9.588
Parameter(s)	FOV(°)	F2(mm)	F6(mm)
					Numerical value	112	12.922	16.816

In the present embodiment, TTL/F is 3.926 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the total optical length TTL of the optical lens, the maximum view field angle FOV of the optical lens and the image height h corresponding to the maximum field angle of the optical lens meet the condition that TTL/h/FOV is 0.017; D/h/FOV is 0.008 when the maximum field angle FOV of the optical lens, the maximum light-transmitting caliber D of the object side surface S1 of the first lens L1 corresponding to the maximum field angle of the optical lens and the image height h corresponding to the maximum field angle of the optical lens are met; F2/F2.784 is satisfied between the focal length value F2 of the second optical lens L2 and the focal length value F of the entire group of optical lenses; F6/F3.630 is satisfied between the focal length value F6 of the sixth optical lens L6 and the focal length value F of the entire group of the optical lenses; and the radius of curvature R31 of the object-side surface of the optical lens third lens L3 and the radius of curvature R32 of the image-side surface thereof satisfy | R31/R32| ═ 3.642.

Example 3

An optical lens according to embodiment 3 of the present application is described below with reference to fig. 3. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical lens according to embodiment 3 of the present application.

As shown in fig. 3, the optical lens includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

The first lens L1 is a meniscus lens with negative power, with the object side S1 being convex and the image side S2 being concave.

The second lens L2 is a biconvex lens with positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The second lens L2 is an aspherical lens.

The third lens L3 is a biconvex lens with positive power, and has a convex object-side surface S6 and a convex image-side surface S7.

The fourth lens element L4 is a biconvex lens with positive power, and has a convex object-side surface S8 and a convex image-side surface S9. The fifth lens L5 is a biconcave lens with negative power, and has a concave object-side surface S9 and a concave image-side surface S10. Wherein, the fourth lens L4 and the fifth lens L5 are cemented to form a cemented lens.

The sixth lens L6 is a meniscus lens with positive power, with the object side S11 being concave and the image side S12 being convex. The sixth lens L6 is an aspherical lens.

Optionally, the optical lens may further include a filter L7 and/or a protective lens L7' having an object side S13 and an image side S14. Filter L7 can be used to correct for color deviations. The protective lens L7' may be used to protect the image sensing chip on the imaging plane IMA. Light from the object passes through each of the surfaces S1 to S14 in sequence and is finally imaged on the imaging plane IMA.

In the optical lens of the present embodiment, a stop STO may be provided between the second lens L2 and the third lens L3 to improve the imaging quality.

Table 7 below shows a radius of curvature R, a thickness T, a refractive index Nd, and an abbe number Vd of each lens of the optical lens of example 3, where the radius of curvature R and the thickness T are both in units of millimeters (mm). Table 8 below shows the conic coefficients k and the high-order term coefficients A, B, C, D and E that can be used for the aspherical lens surfaces S3, S4, S11, and S12 in example 3. Table 9 below gives the total optical length TTL of the optical lens of example 3 (i.e., the on-axis distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S15), the entire group focal length value F of the optical lens, the maximum clear aperture D of the object-side surface S1 of the first lens L1 corresponding to the maximum angle of view of the optical lens, the image height h corresponding to the maximum angle of view of the optical lens, the maximum angle of view FOV of the optical lens, the focal length value F2 of the second lens of the optical lens, and the focal length value F6 of the sixth lens of the optical lens.

TABLE 7

Flour mark	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	35.0000	0.8641	1.80	46.57
2	2.7951	2.1920
					3	16.2001	1.7283	1.64	23.53
4	-18.8811	1.2437
					STO	All-round	-0.0289
6	15.3905	1.7283	1.53	64.21
					7	-4.2280	0.0960
8	6.2858	2.1401	1.73	44.90
					9	-5.0762	0.5761	1.85	23.78
10	6.7026	0.7385
					11	-124.3720	1.5145	1.53	56.07
12	-9.9029	0.9588
					13	All-round	0.9500	1.52	64.21
14	All-round	2.3797
					IMA	All-round

TABLE 8

Surf

K

A

B

C

D

E

3

-0.9033

-3.8749E-04

1.3598E-04

4.0775E-05

-4.2585E-06

5.6145E-06

4

-100.0000

-1.2937E-03

6.0607E-04

5.9945E-06

-7.9627E-06

1.7035E-06

11

120.0000

-4.1035E-03

-3.3047E-04

1.0834E-05

-2.0292E-06

1.4609E-07

12

-100.0000

-9.7066E-03

1.8876E-03

-1.9924E-04

2.5862E-05

-8.7260E-07

TABLE 9

In the present embodiment, TTL/F is 4.373 between the total optical length TTL of the optical lens and the whole focal length F of the optical lens; the total optical length TTL of the optical lens, the maximum field angle FOV of the optical lens and the image height h corresponding to the maximum field angle of the optical lens meet the condition that TTL/h/FOV is 0.021; D/h/FOV is 0.007 between the maximum view field angle FOV of the optical lens, the maximum clear aperture D of the object side surface S1 of the first lens L1 corresponding to the maximum view field angle of the optical lens and the image height h corresponding to the maximum view field angle of the optical lens; F2/F3.558 is satisfied between the focal length value F2 of the second optical lens L2 and the focal length value F of the entire group of optical lenses; F6/F5.129 is satisfied between the focal length value F6 of the sixth optical lens L6 and the focal length value F of the entire group of the optical lenses; and the radius of curvature R31 of the object-side surface of the optical lens third lens L3 and the radius of curvature R32 of the image-side surface thereof satisfy | R31/R32| ═ 3.640.

In summary, examples 1 to 3 each satisfy the relationship shown in table 10 below.

Watch 10

Conditional formula (II)	1	2	3
				TTL/f	3.741	3.926	4.373
TTL/h/FOV	0.024	0.017	0.021
				D/h/FOV	0.008	0.008	0.007
F2/F	2.874	2.784	3.558
				F6/F	3.893	3.630	5.129
∣R31/R32∣	3.499	3.642	3.640

The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (24)

1. An optical lens system, wherein the lens elements having optical power include only a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, and the first lens element to the sixth lens element are arranged in order from an object side to an image side along an optical axis,

it is characterized in that the preparation method is characterized in that,

the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens and the third lens have positive focal power, and both the object side surface and the image side surface of the second lens and the third lens are convex surfaces;

the fourth lens has positive optical power;

the fifth lens has a negative optical power; and

the sixth lens element has positive focal power, a concave object-side surface and a convex image-side surface,

wherein, the maximum view field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum view field angle of the optical lens, and the image height h corresponding to the maximum view field angle of the optical lens satisfy: (D is multiplied by 180 degrees) and/(h is multiplied by FOV) is less than or equal to 2.7.

2. An optical lens barrel according to claim 1, wherein the object-side surface and the image-side surface of the fourth lens are convex.

3. An optical lens barrel according to claim 1, wherein the fifth lens element has both object and image side surfaces that are concave.

4. An optical lens according to claim 1, characterized in that the third lens is a glass sphere lens.

5. An optical lens according to claim 1, characterized in that at least one of the second lens and the sixth lens is an aspherical mirror.

6. An optical lens according to any one of claims 1 to 5,

the fourth lens and the fifth lens are cemented to form a cemented lens.

7. An optical lens according to any one of claims 1 to 5, characterized in that the optical lens further comprises a diaphragm arranged between the second lens and the third lens.

8. An optical lens barrel according to any one of claims 1 to 5, wherein a distance TTL between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis and a full group focal length value F of the optical lens satisfy: TTL/F is more than or equal to 2.5 and less than or equal to 5.5.

9. An optical lens barrel according to any one of claims 1 to 5, wherein a distance TTL between a center of an object-side surface of the first lens and an imaging surface of the optical lens on the optical axis, a maximum field angle FOV of the optical lens, and an image height h corresponding to the maximum field angle of the optical lens satisfy: (TTL is multiplied by 180 degrees) and/(h is multiplied by FOV) is less than or equal to 5.4.

10. An optical lens barrel according to any one of claims 1 to 5, wherein the third lens has an object side radius of curvature R31 and an image side radius of curvature R32 satisfying: and the | R31/R32| is more than or equal to 2.

11. An optical lens according to claim 1 or 5,

the second lens is a plastic lens, an

The focal length value F2 of the second lens and the focal length value F of the whole group of the optical lens satisfy that: F2/F is more than or equal to 1.5 and less than or equal to 4.5.

12. An optical lens according to claim 1 or 5,

the sixth lens is a plastic lens, an

The focal length value F6 of the sixth lens and the focal length value F of the whole group of the optical lens satisfy that: F6/F is more than or equal to 3 and less than or equal to 6.

13. An optical lens system, wherein the lens elements having optical power include only a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, and the first lens element to the sixth lens element are arranged in order from an object side to an image side along an optical axis,

it is characterized in that the preparation method is characterized in that,

the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens, the third lens and the fourth lens each have a positive optical power;

the fifth lens has a negative optical power;

the sixth lens element has positive focal power, a concave object-side surface and a convex image-side surface,

wherein the object side surface and the image side surface of the second lens are convex surfaces,

wherein the third lens has an object side curvature radius R31 and an image side curvature radius R32 satisfying: i R31/R32| ≧ 2, an

Wherein, the maximum view field angle FOV of the optical lens, the maximum clear aperture D of the object-side surface of the first lens corresponding to the maximum view field angle of the optical lens, and the image height h corresponding to the maximum view field angle of the optical lens satisfy: (D is multiplied by 180 degrees) and/(h is multiplied by FOV) is less than or equal to 2.7.

14. An optical lens barrel according to claim 13, wherein the object side surface and the image side surface of the third lens are convex.

15. An optical lens barrel according to claim 13, wherein the object side surface and the image side surface of the fourth lens are convex.

16. An optical lens barrel according to claim 13, wherein the fifth lens element has concave object-side and image-side surfaces.

17. An optical lens barrel according to any one of claims 13 to 16, wherein the fourth lens and the fifth lens are cemented to constitute a cemented lens.

18. An optical lens according to any one of claims 13-16, characterized in that the optical lens further comprises a diaphragm arranged between the second lens and the third lens.

19. An optical lens barrel according to any one of claims 13 to 16, wherein a distance TTL between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis, a maximum field angle FOV of the optical lens, and an image height h corresponding to the maximum field angle of the optical lens satisfy: (TTL is multiplied by 180 degrees) and/(h is multiplied by FOV) is less than or equal to 5.4.

20. An optical lens barrel according to any one of claims 13 to 16, wherein a distance TTL between a center of an object side surface of the first lens and an imaging surface of the optical lens on the optical axis and a full group focal length value F of the optical lens satisfy: TTL/F is more than or equal to 2.5 and less than or equal to 5.5.

21. An optical lens according to claim 13, characterized in that at least one of the second lens and the sixth lens is an aspherical mirror.

22. An optical lens according to claim 13, characterized in that the third lens is a glass sphere lens.

23. An optical lens according to claim 13 or 21,

the second lens is a plastic lens, an

The focal length value F2 of the second lens and the focal length value F of the whole group of the optical lens satisfy that: F2/F is more than or equal to 1.5 and less than or equal to 4.5.

24. An optical lens according to claim 13 or 21,

the sixth lens is a plastic lens, an

The focal length value F6 of the sixth lens and the focal length value F of the whole group of the optical lens satisfy that: F6/F is more than or equal to 3 and less than or equal to 6.

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