CN211348832U - Optical pick-up lens - Google Patents

Abstract

The application discloses an optical camera lens, it includes from the object side to the image side along the optical axis in proper order: a first lens having a positive refractive power, an object-side surface of which is convex; a second lens having a negative optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a positive optical power; and a sixth lens having optical power; wherein the entrance pupil diameter EPD of the optical camera lens satisfies: 3.5mm < EPD < 6.4 mm.

Description

Optical pick-up lens

Technical Field

The present application relates to the field of optical elements, and in particular, to an optical imaging lens.

Background

In recent years, with the rapid development of portable electronic devices such as smart phones and tablet computers, people have higher and higher requirements on the photographing quality of the portable electronic devices. Imaging lenses having features such as ultra-wide angle, telephoto, and macro are also increasingly used in these devices. However, the increase in the number of imaging lenses undoubtedly occupies more space while increasing the cost. This is contrary to the lightness and thinness and beauty sought for portable electronic devices. Therefore, how to integrate the multifunctional camera lenses and how to reduce the number of the camera lenses have become one of the problems to be solved in the field of lens design.

SUMMERY OF THE UTILITY MODEL

The present application provides an optical imaging lens, sequentially from an object side to an image side along an optical axis, comprising: a first lens having a positive refractive power, an object-side surface of which is convex; a second lens having a negative optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having a positive optical power; a sixth lens having optical power.

In one embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the total effective focal length f of the optical imaging lens may satisfy: 1.5 < (f1-f2)/f < 2.

In one embodiment, the maximum field angle FOV of the optical imaging lens may satisfy: tan (2FOV) < 10.

In one embodiment, the optical imaging lens may further include an adjustable aperture stop, wherein a maximum distance STLmax from the adjustable aperture stop to an object side surface of the first lens, a minimum distance STLmin from the adjustable aperture stop to the object side surface of the first lens, and a distance TTL on an optical axis from the object side surface of the first lens to an imaging surface of the optical imaging lens may satisfy: 0 < (STLmax-STLmin)/TTL < 0.5.

In one embodiment, the combined focal length f123 of the first lens, the second lens and the third lens and the total effective focal length f of the optical image pickup lens may satisfy: f123/f is more than 1.2 and less than 1.7.

In one embodiment, the radius of curvature R12 of the image-side surface of the sixth lens and the radius of curvature R6 of the image-side surface of the third lens may satisfy: 0 < (R12-R6)/(R12+ R6) < 0.5.

In one embodiment, a distance T45 between the fourth lens and the fifth lens on the optical axis and a distance Tr7r10 between the object-side surface of the fourth lens and the image-side surface of the fifth lens on the optical axis satisfy: 0.2 < T45/Tr7r10 < 0.5.

In one embodiment, the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens may satisfy: 1 is less than or equal to CT3/CT4 is less than 1.5.

In one embodiment, the central thickness CT6 of the sixth lens element and the distance BFL on the optical axis from the image-side surface of the sixth lens element to the imaging surface of the optical imaging lens may satisfy: 1 < CT6/BFL < 1.5.

In one embodiment, the distance T34 between the third lens and the fourth lens on the optical axis and the central thickness CT3 of the third lens may satisfy: 0.9 < T34/CT3 < 1.4.

In one embodiment, the maximum effective radius DT12 of the image-side surface of the first lens and the maximum effective radius DT62 of the image-side surface of the sixth lens may satisfy: 1 < DT12/DT62 < 1.3.

In one embodiment, the maximum effective radius DT11 of the object side surface of the first lens, the maximum effective radius DT62 of the image side surface of the sixth lens, and half ImgH of the diagonal length of the effective pixel region on the imaging surface of the optical imaging lens may satisfy: DT11/DT62-DT11/ImgH < 0.1.

In one embodiment, the entrance pupil diameter EPD of the optical camera lens may satisfy: 3.5mm < EPD < 6.4 mm.

In one embodiment, a front end of an optical imaging lens is provided with a first diaphragm adjustment device and a second diaphragm adjustment device, wherein: the first aperture adjusting device is linked with the adjustable aperture to adjust the size of the adjustable aperture; and the second aperture adjusting device is fixedly connected with the first aperture adjusting device and slides back and forth along the optical axis to adjust the position of the adjustable aperture.

The application adopts a plurality of lenses (for example, six lenses), provides the telephoto lens with the adjustable aperture, and reasonably distributes the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like of each lens by switching the size and the position of the adjustable aperture, so that the optical pick-up lens has at least one beneficial effect of the telephoto function of the telephoto lens, the portrait function of the large aperture lens, the integration of the portrait lens and the telephoto lens and the like.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a schematic structural diagram illustrating an optical imaging lens according to embodiment 1 of the present application, in which a distance from an adjustable aperture stop to an object-side surface of a first lens is the largest;

fig. 2 is a schematic structural view of an optical imaging lens when the distance from an adjustable aperture stop to the object-side surface of a first lens is minimum according to embodiment 1 of the present application;

fig. 3A to 3D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system according to embodiment 1, in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest;

fig. 4A to 4D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system of embodiment 1 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest;

fig. 5 is a schematic structural view of an optical imaging lens according to embodiment 2 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest;

fig. 6 is a schematic structural view of an optical imaging lens when the distance from an adjustable aperture stop to the object-side surface of a first lens is minimum according to embodiment 2 of the present application;

fig. 7A to 7D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system according to embodiment 2, in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest;

fig. 8A to 8D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens according to embodiment 2 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest, respectively;

fig. 9 is a schematic structural view of an optical imaging lens according to embodiment 3 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest;

fig. 10 is a schematic structural view of an optical imaging lens when the distance from an adjustable aperture stop to the object-side surface of a first lens is minimum according to embodiment 3 of the present application;

fig. 11A to 11D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system according to embodiment 3, in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest;

fig. 12A to 12D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system of embodiment 3 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest;

fig. 13 is a schematic structural view of an optical imaging lens according to embodiment 4 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest;

fig. 14 is a schematic structural view of an optical imaging lens when the distance from an adjustable aperture stop to the object-side surface of a first lens is minimum according to embodiment 4 of the present application;

fig. 15A to 15D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system according to embodiment 4, in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest;

fig. 16A to 16D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens according to example 4 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest, respectively;

fig. 17 is a schematic structural view of an optical imaging lens according to embodiment 5 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest;

fig. 18 is a schematic structural view of an optical imaging lens when the distance from an adjustable aperture stop to the object-side surface of a first lens is minimum according to embodiment 5 of the present application;

fig. 19A to 19D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system of embodiment 5 in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, respectively;

fig. 20A to 20D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens system of embodiment 5 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest;

FIG. 21 is a schematic diagram of a first and second adjustable aperture stop arrangement according to various embodiments of the present application; and

FIG. 22 is a schematic plan view of an adjustable aperture according to embodiments 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 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 of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

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 imaging lens according to an exemplary embodiment of the present application may include six lenses having optical powers, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, respectively. The six lenses are arranged along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the sixth lens can have a spacing distance therebetween.

In an exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens may have a negative optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive optical power; the sixth lens may have a positive power or a negative power.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < (f1-f2)/f < 2, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and f is the total effective focal length of the optical imaging lens. More specifically, f1, f2, and f further satisfy: 1.5 < (f1-f2)/f < 1.8. Satisfies 1.5 < (f1-f2)/f < 2, and can well realize the focusing function of the front group of lenses.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: tan (2FOV) < 10, where FOV is the maximum field angle of the optical imaging lens. More specifically, the FOV may further satisfy: tan (2FOV) < 2.5. The requirement that tan (2FOV) is less than 10 is met, and the telephoto characteristic of the telephoto lens is favorably ensured.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < (STLmax-STLmin)/TTL < 0.5, wherein STLmax is the maximum distance from the adjustable aperture stop to the object side surface of the first lens, STLmin is the minimum distance from the adjustable aperture stop to the object side surface of the first lens, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical camera lens on the optical axis. More specifically, STLmax, STLmin, and TTL may further satisfy: 0.3 < (STLmax-STLmin)/TTL < 0.5. The requirement that (STLmax-STLmin)/TTL is less than 0.5 is met, and the integral imaging quality of the system working under different apertures is ensured.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.2 < f123/f < 1.7, wherein f123 is the combined focal length of the first lens, the second lens and the third lens, and f is the total effective focal length of the optical camera lens. F123/f is more than 1.2 and less than 1.7, which is beneficial to well embodying the focusing characteristic of the front group of lenses of the long-focus system.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0 < (R12-R6)/(R12+ R6) < 0.5, where R12 is the radius of curvature of the image-side surface of the sixth lens and R6 is the radius of curvature of the image-side surface of the third lens. More specifically, R12 and R6 may further satisfy: 0 < (R12-R6)/(R12+ R6) < 0.3. Satisfy 0 < (R12-R6)/(R12+ R6) < 0.5, can be fine reduce the paraxial aberration of system, improve the optical imaging quality of paraxial visual field.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.2 < T45/Tr7r10 < 0.5, wherein T45 is the distance on the optical axis from the fourth lens to the fifth lens, and Tr7r10 is the distance on the optical axis from the object side surface of the fourth lens to the image side surface of the fifth lens. The light ray conversion system meets the requirement that T45/Tr7r10 is more than 0.2 and less than 0.5, can effectively bear the change of front and rear groups of light rays of the system, and effectively corrects the field curvature and distortion of the system.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1 ≦ CT3/CT4 < 1.5, where CT3 is the center thickness of the third lens and CT4 is the center thickness of the fourth lens. Meeting the requirement that CT3/CT4 is more than or equal to 1 and less than 1.5, and being beneficial to correcting paraxial aberration of the system, such as coma, axial chromatic aberration and the like.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1 < CT6/BFL < 1.5, wherein CT6 is the center thickness of the sixth lens element, and BFL is the distance on the optical axis from the image side surface of the sixth lens element to the imaging surface of the optical image pickup lens. More specifically, CT6 and BFL may further satisfy: CT6/BFL is more than 1.2 and less than 1.5. The requirement that CT6/BFL is more than 1 and less than 1.5 is met, the adjustable focusing range of the system can be ensured, the aberration of the system can be effectively reduced, and the integral imaging quality is improved.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.9 < T34/CT3 < 1.4, wherein T34 is the distance on the optical axis from the third lens to the fourth lens, and CT3 is the center thickness of the third lens. More specifically, T34 and CT3 further satisfy: 0.9 < T34/CT3 < 1.3. The optical power distribution of the front group lens is facilitated on one hand, and the axial chromatic aberration and the chromatic spherical aberration of the system can be effectively reduced on the other hand, the requirement that T34/CT3 is more than 0.9 and less than 1.4 is met.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1 < DT12/DT62 < 1.3, where DT12 is the maximum effective radius of the image-side surface of the first lens and DT62 is the maximum effective radius of the image-side surface of the sixth lens. More specifically, DT12 and DT62 further satisfy: 1.1 < DT12/DT62 < 1.2. The requirements that DT12/DT62 is more than 1.3 are met, the structural characteristics of a tele system are favorably embodied on one hand, and the size section difference of different lenses of the system can be effectively ensured on the other hand, so that the assembly is more favorably realized.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: DT11/DT62-DT11/ImgH < 0.1, where DT11 is the maximum effective radius of the object side surface of the first lens, DT62 is the maximum effective radius of the image side surface of the sixth lens, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens. The structural characteristics of the long-focus system can be ensured, and the whole size of the system can be effectively reduced at the same time when DT11/DT62-DT11/ImgH is less than 0.1.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < YC62/DT62 < 1, wherein YC62 is the vertical distance from the inflection point of the image-side surface of the sixth lens to the optical axis, and DT62 is the maximum effective radius of the image-side surface of the sixth lens. More specifically, YC62 and DT62 further satisfy: YC62/DT62 is more than 0.5 and less than 0.9. The matching of the main ray angle of the system and the main ray angle of the chip is favorably ensured and the field curvature of the system can be effectively corrected on the other hand by meeting the requirement that YC62/DT62 is more than 0.5 and less than 1.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 3.5mm < EPD < 6.4mm, wherein EPD is the entrance pupil diameter of the optical camera lens. More specifically, the EPD may further satisfy: 3.7mm < EPD < 6.4 mm. The requirements that the EPD is more than 3.5mm and less than 6.4mm are met, and different characteristics of the system can be realized through the change of the aperture diameter.

In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: the front end of optical camera lens is provided with first diaphragm adjusting device and second diaphragm adjusting device, wherein: the first aperture adjusting device is linked with the adjustable aperture to adjust the size of the adjustable aperture; and the second aperture adjusting device is fixedly connected with the first aperture adjusting device and slides back and forth along the optical axis to adjust the position of the adjustable aperture. Through adjusting the position and the size of the aperture, the range of the aperture value from 1.4 to 2.4 can be switched, so that the telephoto function, the portrait shooting and the background blurring function of the system can be well considered.

In an exemplary embodiment, an optical imaging lens according to the present application further includes a stop disposed between the object side and the first lens. Alternatively, the above-described optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image forming surface.

The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. By switching the size and the position of the adjustable aperture, the focal power, the surface type, the center thickness of each lens, the on-axis distance between each lens and the like of each lens are reasonably distributed, the volume of the optical camera lens can be effectively reduced, the processability of the optical camera lens is improved, and the optical camera lens is more beneficial to production and processing and is suitable for portable electronic products. The optical camera lens with the configuration has the characteristics of long-focus lens, large-aperture lens, integration of the large-aperture lens and the long-focus lens, and the like.

In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has 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, and the imaging quality is further improved. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspheric mirror surface. Optionally, each of the first, second, third, fourth, fifth, and sixth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.

However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens 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 imaging lens is not limited to including six lenses. The optical camera lens may also include other numbers of lenses, if desired.

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

Example 1

An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 4D. Fig. 1 is a schematic structural diagram illustrating an optical imaging lens system according to embodiment 1 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest. Fig. 2 is a schematic structural diagram of an optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum according to embodiment 1 of the present application.

As shown in fig. 1 and fig. 2, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

Table 1 shows a basic parameter table of the optical imaging lens of embodiment 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).

TABLE 1

In the present example, the total effective focal length f of the optical imaging lens is 9.09mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging lens) is 11.57mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens is 2.80mm, the maximum field angle FOV of the optical imaging lens is 33.6 °, the entrance pupil diameter EPDmax of the optical imaging lens when the adjustable aperture stop is at the maximum distance to the object-side surface of the first lens is 6.34mm, the entrance pupil diameter EPDmin of the optical imaging lens when the adjustable aperture stop is at the minimum distance to the object-side surface of the first lens is 3.79mm, the maximum distance stlax of the adjustable aperture stop to the object-side surface of the first lens is 3.17mm, and the minimum distance STLmin of the adjustable aperture stop to the object-side surface of the first lens is-1.17 mm.

In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the sixth lens E6 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex 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 a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S12 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.1653E-03

-3.5907E-05

-2.2264E-05

6.0841E-06

-1.5901E-06

2.6783E-07

-2.8073E-08

1.6411E-09

-4.2234E-11

S2

3.9718E-03

-9.3581E-04

-1.5212E-04

1.1154E-04

-2.5428E-05

3.2767E-06

-2.5569E-07

1.1296E-08

-2.1844E-10

S3

1.3175E-02

-2.8498E-03

-2.6139E-04

2.8703E-04

-7.4726E-05

1.1033E-05

-1.0090E-06

5.3542E-08

-1.2627E-09

S4

1.9611E-02

3.6894E-03

-5.1489E-03

2.3352E-03

-6.4010E-04

1.1782E-04

-1.4331E-05

1.0335E-06

-3.3170E-08

S5

-1.9313E-02

1.2098E-02

-5.5065E-03

1.8520E-03

-4.6030E-04

8.1721E-05

-9.6398E-06

6.6846E-07

-2.0721E-08

S6

-2.8928E-02

1.0053E-02

-3.1824E-03

7.4351E-04

-1.5238E-04

2.7647E-05

-3.6529E-06

2.7567E-07

-8.7130E-09

S7

-8.2705E-03

1.6336E-03

-2.7797E-04

1.1871E-04

-5.6665E-05

1.5458E-05

-2.0323E-06

1.0147E-07

0.0000E+00

S8

-8.0870E-03

2.1213E-03

-4.6232E-04

8.6156E-05

-2.3122E-05

7.6103E-06

-1.2426E-06

7.0287E-08

0.0000E+00

S9

-1.4584E-02

1.1573E-02

-9.2230E-03

4.3830E-03

-1.6281E-03

4.5134E-04

-8.3868E-05

9.0535E-06

-4.2038E-07

S10

-2.7843E-02

2.8489E-02

-1.7396E-02

6.7226E-03

-1.8493E-03

3.5918E-04

-4.6114E-05

3.4708E-06

-1.1383E-07

S11

-5.7214E-02

2.6929E-02

-1.1335E-02

3.6729E-03

-9.0149E-04

1.5696E-04

-1.8077E-05

1.2374E-06

-3.7862E-08

S12

-3.2131E-02

5.7148E-03

-8.1006E-04

4.0180E-06

2.7414E-05

-7.0602E-06

9.2458E-07

-6.4433E-08

1.8963E-09

TABLE 2

Fig. 3A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 3B shows an astigmatism curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is maximum in embodiment 1, which represents meridional field curvature and sagittal field curvature. Fig. 3C shows a distortion curve of the optical imaging lens according to embodiment 1, which shows distortion magnitude values corresponding to different image heights, when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest. Fig. 3D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 3A to 3D, the optical imaging lens system according to embodiment 1 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest.

Fig. 4A shows an axial chromatic aberration curve of the optical imaging lens of embodiment 1 when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum in embodiment 1. Fig. 4C shows a distortion curve of the optical imaging lens according to embodiment 1, in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest, and the distortion curve represents values of distortion magnitudes corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents a deviation of different image heights on an imaging plane after light passes through the lens, when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum. As can be seen from fig. 4A to 4D, the optical imaging lens system according to embodiment 1 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest.

Example 2

An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 5 to 8D. Fig. 5 is a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest. Fig. 6 is a schematic structural view of an optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum according to embodiment 2 of the present application.

As shown in fig. 5 and fig. 6, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 9.09mm, the total length TTL of the optical imaging lens is 11.70mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens is 2.80mm, the maximum field angle FOV of the optical imaging lens is 33.6 °, the entrance pupil diameter EPDmax of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is maximum is 6.34mm, the entrance pupil diameter EPDmin of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is minimum is 3.79mm, the maximum distance from the adjustable aperture to the object-side surface of the first lens is 3.17mm, and the minimum distance from the adjustable aperture to the object-side surface of the first lens is-1.17 mm.

Table 3 shows a basic parameter table of the optical imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 3

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-8.7755E-04

-4.4929E-05

-3.2322E-05

1.1812E-05

-2.9788E-06

4.5921E-07

-4.3993E-08

2.3817E-09

-5.7230E-11

S2

5.9970E-03

-2.5366E-03

5.4018E-04

-7.4091E-05

6.4075E-06

-2.6347E-07

-7.4626E-09

1.2959E-09

-4.1722E-11

S3

1.3894E-02

-6.2846E-03

1.7855E-03

-3.9315E-04

6.9558E-05

-9.0949E-06

7.9050E-07

-4.0150E-08

8.9776E-10

S4

2.9298E-02

-9.9283E-03

3.2184E-03

-8.5922E-04

1.9006E-04

-3.1536E-05

3.6379E-06

-2.6347E-07

9.0094E-09

S5

-4.4139E-03

4.1852E-05

3.0566E-04

-1.0142E-04

1.1400E-05

9.5221E-07

-4.4280E-07

5.1102E-08

-2.2815E-09

S6

-1.5505E-02

2.4030E-03

-3.7001E-04

5.4427E-05

-2.4023E-05

6.6949E-06

-9.7068E-07

7.1103E-08

-2.1831E-09

S7

-7.1516E-03

-1.4948E-04

4.6794E-04

-5.7459E-05

-2.3993E-06

3.4500E-07

8.3810E-08

-6.4106E-09

0.0000E+00

S8

-7.0435E-03

-3.5880E-03

1.9428E-03

-3.6562E-04

2.9261E-05

-2.4989E-07

-1.1132E-07

1.1061E-08

0.0000E+00

S9

7.2576E-03

-1.2480E-02

4.0289E-03

-1.0065E-03

2.9458E-04

-9.0509E-05

1.8309E-05

-1.9283E-06

8.1054E-08

S10

3.0708E-03

-3.1841E-03

-1.2158E-03

1.0735E-03

-3.2661E-04

4.9278E-05

-3.3951E-06

9.2860E-08

-3.1186E-09

S11

-3.4679E-02

1.0424E-02

-4.1725E-03

1.2830E-03

-2.6251E-04

3.4412E-05

-3.6563E-06

4.3457E-07

-3.0108E-08

S12

-3.4591E-02

7.5802E-03

-2.0097E-03

4.7713E-04

-9.2129E-05

1.3397E-05

-1.3543E-06

8.1765E-08

-2.2105E-09

TABLE 4

Fig. 7A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 7B shows an astigmatism curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is maximum in embodiment 2, which represents meridional field curvature and sagittal field curvature. Fig. 7C shows a distortion curve of the optical imaging lens of embodiment 2 in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents values of distortion magnitudes corresponding to different image heights. Fig. 7D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 7A to 7D, the optical imaging lens system according to embodiment 2 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest.

Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest in embodiment 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest in embodiment 2. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 2 when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, which represents a deviation of different image heights on the imaging plane after light passes through the lens, when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum. As can be seen from fig. 8A to 8D, the optical imaging lens system according to embodiment 2 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest.

Example 3

An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 9 to 12D. Fig. 9 is a schematic structural view of an optical imaging lens according to embodiment 3 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest. Fig. 10 is a schematic structural view of an optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum according to embodiment 3 of the present application.

As shown in fig. 9 and 10, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 9.10mm, the total length TTL of the optical imaging lens is 10.44mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens is 2.80mm, the maximum field angle FOV of the optical imaging lens is 33.6 °, the entrance pupil diameter EPDmax of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is maximum is 6.34mm, the entrance pupil diameter EPDmin of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is minimum is 3.79mm, the maximum distance from the adjustable aperture to the object-side surface of the first lens is 3.17mm, and the minimum distance from the adjustable aperture to the object-side surface of the first lens is-1.17 mm.

Table 5 shows a basic parameter table of the optical imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 5

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.1908E-03

5.1690E-05

-4.4904E-05

3.0021E-06

9.9519E-07

-3.7966E-07

5.0262E-08

-3.1562E-09

7.7669E-11

S2

3.0713E-02

-2.7727E-02

1.5184E-02

-4.8488E-03

9.6325E-04

-1.2195E-04

9.6202E-06

-4.3273E-07

8.5083E-09

S3

3.9068E-02

-3.5273E-02

1.9432E-02

-6.2925E-03

1.2824E-03

-1.6778E-04

1.3740E-05

-6.4380E-07

1.3233E-08

S4

2.4259E-02

-1.8782E-02

1.2844E-02

-4.8062E-03

1.0607E-03

-1.3762E-04

9.4867E-06

-2.3884E-07

-2.8416E-09

S5

-1.1316E-02

9.9608E-04

4.3669E-03

-2.4736E-03

6.4616E-04

-9.3012E-05

7.0486E-06

-2.0784E-07

-1.0545E-09

S6

-2.5706E-02

1.0937E-02

-3.8015E-03

7.9437E-04

-9.0093E-05

-1.0120E-06

1.9973E-06

-2.6289E-07

1.2117E-08

S7

-1.4281E-02

3.8019E-03

-8.9741E-04

4.4688E-05

9.0917E-06

-1.0944E-06

-1.2481E-06

4.7940E-07

-4.4230E-08

S8

-8.3753E-03

2.7003E-03

-1.3951E-03

8.7999E-04

-6.3964E-04

2.6577E-04

-6.4652E-05

9.0252E-06

-5.4751E-07

S9

-2.3191E-02

1.6073E-04

2.2579E-03

-3.9797E-03

2.9779E-03

-1.3097E-03

3.3513E-04

-4.5225E-05

2.4675E-06

S10

-2.4648E-02

4.8666E-03

-1.6801E-03

-7.4476E-05

4.1579E-04

-2.4212E-04

7.0488E-05

-1.0201E-05

5.7720E-07

S11

-3.1528E-02

2.4843E-03

2.1756E-03

-3.1289E-03

2.1130E-03

-8.5569E-04

2.0388E-04

-2.6117E-05

1.3782E-06

S12

-2.3086E-02

9.7143E-04

5.8560E-04

-4.1472E-04

1.3751E-04

-2.8664E-05

3.7096E-06

-2.7012E-07

8.3077E-09

TABLE 6

Fig. 11A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 11B shows an astigmatism curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is maximum, which represents meridional field curvature and sagittal field curvature, of embodiment 3. Fig. 11C shows a distortion curve of the optical imaging lens of embodiment 3 in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents values of distortion magnitudes corresponding to different image heights. Fig. 11D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 11A to 11D, the optical imaging lens system according to embodiment 3 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest.

Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest in embodiment 3, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum in embodiment 3. Fig. 12C shows a distortion curve of the optical imaging lens according to embodiment 3, which shows distortion magnitude values corresponding to different image heights, when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens, when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum. As can be seen from fig. 12A to 12D, the optical imaging lens system according to embodiment 3 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest.

Example 4

An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 13 to 16D. Fig. 13 is a schematic structural view of an optical imaging lens according to embodiment 4 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest. Fig. 14 is a schematic structural view of an optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum according to embodiment 4 of the present application.

As shown in fig. 13 and 14, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 9.10mm, the total length TTL of the optical imaging lens is 10.42mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens is 2.80mm, the maximum field angle FOV of the optical imaging lens is 33.6 °, the entrance pupil diameter EPDmax of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is maximum is 6.34mm, the entrance pupil diameter EPDmin of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is minimum is 3.79mm, the maximum distance from the adjustable aperture to the object-side surface of the first lens is 3.17mm, and the minimum distance from the adjustable aperture to the object-side surface of the first lens is-1.17 mm.

Table 7 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 7

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.3297E-03

-2.0049E-05

-3.6557E-05

8.6612E-06

-1.6565E-06

1.9079E-07

-1.5887E-08

8.0013E-10

-1.7746E-11

S2

1.1404E-02

-5.5532E-03

2.4696E-03

-6.7027E-04

1.1244E-04

-1.2084E-05

8.2350E-07

-3.2781E-08

5.8560E-10

S3

1.6905E-02

-8.5647E-03

3.4817E-03

-8.7255E-04

1.3674E-04

-1.3751E-05

8.8692E-07

-3.4603E-08

6.4080E-10

S4

1.5511E-02

1.6910E-03

-1.6023E-03

4.2795E-04

-2.1677E-05

-1.3270E-05

3.1114E-06

-2.7392E-07

8.7698E-09

S5

-1.4619E-02

1.3390E-02

-5.3902E-03

1.2575E-03

-1.4637E-04

6.3773E-07

1.8178E-06

-1.8367E-07

5.9080E-09

S6

-2.4037E-02

8.3890E-03

-2.6937E-03

5.6338E-04

-6.7211E-05

8.7206E-07

9.1795E-07

-1.1427E-07

4.7612E-09

S7

-1.3926E-02

2.7627E-03

-9.4107E-04

3.2962E-04

-1.6873E-04

6.0757E-05

-1.3837E-05

1.8153E-06

-9.1682E-08

S8

-5.0641E-03

3.4367E-04

6.0174E-04

-1.3149E-03

1.1023E-03

-5.8359E-04

1.8268E-04

-3.1090E-05

2.2824E-06

S9

-2.7579E-02

2.8266E-03

-3.0367E-03

2.7204E-03

-2.1601E-03

1.0984E-03

-3.4415E-04

5.9557E-05

-4.2777E-06

S10

-2.9157E-02

6.6855E-03

-1.9354E-03

2.8815E-04

4.8196E-05

-4.5638E-05

1.2583E-05

-1.5849E-06

7.6788E-08

S11

-2.7807E-02

5.7131E-03

-4.0940E-04

-4.4948E-04

2.8360E-04

-9.5152E-05

1.8890E-05

-2.0399E-06

9.1711E-08

S12

-2.1160E-02

1.4069E-03

6.8163E-04

-5.2089E-04

1.7374E-04

-3.5009E-05

4.2061E-06

-2.7438E-07

7.3231E-09

TABLE 8

Fig. 15A shows an on-axis chromatic aberration curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest in embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 15B shows an astigmatism curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is maximum, which represents meridional field curvature and sagittal field curvature, of embodiment 4. Fig. 15C shows a distortion curve of the optical imaging lens of embodiment 4 in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents values of distortion magnitudes corresponding to different image heights. Fig. 15D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 15A to 15D, the optical imaging lens system according to embodiment 4 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest.

Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest in embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum in embodiment 4. Fig. 16C shows a distortion curve of the optical imaging lens of embodiment 4 when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum, which represents values of distortion magnitudes corresponding to different image heights. Fig. 16D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 4, which represents a deviation of different image heights on the imaging plane after light passes through the lens, when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum. As can be seen from fig. 16A to 16D, the optical imaging lens system according to embodiment 4 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest.

Example 5

An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 17 to 20D. Fig. 17 is a schematic structural view of an optical imaging lens according to embodiment 5 of the present application, in which the distance from an adjustable aperture stop to the object-side surface of a first lens is the largest. Fig. 18 is a schematic structural view of an optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum according to embodiment 5 of the present application.

As shown in fig. 17 and 18, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an image forming surface S15.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a convex image-side surface S2. The second lens element E2 has negative power, and has a concave object-side surface S3 and a concave image-side surface S4. The third lens element E3 has positive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a concave object-side surface S11 and a concave image-side surface S12. Filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.

In this example, the total effective focal length f of the optical imaging lens is 9.10mm, the total length TTL of the optical imaging lens is 10.39mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens is 2.80mm, the maximum field angle FOV of the optical imaging lens is 33.6 °, the entrance pupil diameter EPDmax of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is maximum is 6.34mm, the entrance pupil diameter EPDmin of the optical imaging lens when the distance from the adjustable aperture to the object-side surface of the first lens is minimum is 3.79mm, the maximum distance from the adjustable aperture to the object-side surface of the first lens is 3.17mm, and the minimum distance from the adjustable aperture to the object-side surface of the first lens is-1.17 mm.

Table 9 shows a basic parameter table of the optical imaging lens of example 5, in which the units of the radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 9

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.0537E-03

-7.5144E-06

-7.0221E-05

2.9188E-05

-7.4012E-06

1.0826E-06

-9.5126E-08

4.5304E-09

-8.9209E-11

S2

1.6360E-02

-9.5267E-03

4.7470E-03

-1.4507E-03

2.7822E-04

-3.4381E-05

2.6832E-06

-1.2088E-07

2.4057E-09

S3

2.7372E-02

-1.8539E-02

9.5333E-03

-3.0216E-03

6.0857E-04

-7.9228E-05

6.5162E-06

-3.0932E-07

6.4802E-09

S4

8.5956E-03

1.4818E-02

-1.5580E-02

8.6627E-03

-2.8873E-03

5.9187E-04

-7.3322E-05

5.0527E-06

-1.4904E-07

S5

-2.8519E-02

3.9610E-02

-2.8600E-02

1.3196E-02

-3.9310E-03

7.4859E-04

-8.8026E-05

5.8249E-06

-1.6570E-07

S6

-2.9127E-02

1.6121E-02

-8.4534E-03

3.2041E-03

-8.4877E-04

1.4960E-04

-1.6536E-05

1.0254E-06

-2.6509E-08

S7

-1.6682E-02

5.0063E-03

-1.7777E-03

2.4357E-04

8.6039E-05

-6.4933E-05

1.7446E-05

-2.2246E-06

1.1798E-07

S8

-5.5804E-03

1.2583E-03

4.5751E-04

-1.6087E-03

1.2780E-03

-5.8903E-04

1.5901E-04

-2.3219E-05

1.4437E-06

S9

-2.3890E-02

-4.4150E-06

3.0732E-04

-1.0957E-03

7.5488E-04

-3.0054E-04

6.5918E-05

-6.9094E-06

2.4730E-07

S10

-2.8345E-02

3.6811E-03

-8.1877E-04

-1.8198E-04

2.4275E-04

-1.0775E-04

2.6123E-05

-3.3090E-06

1.7089E-07

S11

-2.7992E-02

4.1162E-03

-4.2679E-04

-1.6827E-04

1.7694E-04

-8.2769E-05

2.1477E-05

-2.9273E-06

1.6243E-07

S12

-2.1320E-02

1.4289E-03

5.2970E-04

-4.5333E-04

1.6285E-04

-3.5512E-05

4.7002E-06

-3.4606E-07

1.0825E-08

Watch 10

Fig. 19A shows an on-axis chromatic aberration curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest in embodiment 5, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 19B shows an astigmatism curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is maximum, which represents meridional field curvature and sagittal field curvature, of embodiment 5. Fig. 19C shows a distortion curve of the optical imaging lens of embodiment 5 in which the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents values of distortion magnitudes corresponding to different image heights. Fig. 19D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5 when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest, which represents the deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 19A to 19D, the optical imaging lens system according to embodiment 5 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the largest.

Fig. 20A shows an on-axis chromatic aberration curve of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest in embodiment 5, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 20B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum in embodiment 5. Fig. 20C shows a distortion curve of the optical imaging lens of embodiment 5 when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum, which represents values of distortion magnitude corresponding to different image heights. Fig. 20D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging plane after light passes through the lens, when the distance from the adjustable aperture stop to the object-side surface of the first lens is minimum. As can be seen from fig. 20A to 20D, the optical imaging lens system according to embodiment 5 can achieve good imaging quality when the distance from the adjustable aperture stop to the object-side surface of the first lens is the smallest.

In summary, examples 1 to 5 satisfy the relationships shown in table 11, respectively.

Conditional expression (A) example	1	2	3	4	5
						(STLmax-STLmin)/TTL	0.37	0.37	0.42	0.42	0.42
(f1-f2)/f	1.50	1.58	1.55	1.69	1.55
						tan(2FOV)	2.37	2.38	2.37	2.37	2.37
f123/f	1.57	1.38	1.54	1.28	1.51
						(R12-R6)/(R12+R6)	0.17	0.06	0.23	0.11	0.18
T45/Tr7r10	0.30	0.25	0.50	0.44	0.49
						CT3/CT4	1.00	1.02	1.22	1.46	1.20
CT6/BFL	1.29	1.32	1.22	1.41	1.35
						T34/CT3	1.23	1.25	1.23	0.98	1.00
DT12/DT62	1.14	1.15	1.16	1.14	1.15
						DT11/DT62-DT11/ImgH	0.05	0.06	0.08	0.05	0.06
YC62/DT62	0.79	0.77	0.52	0.69	0.57

TABLE 11

FIG. 21 is a schematic diagram of a first and second adjustable aperture stop arrangement according to various embodiments of the present application; and figure 22 is a schematic plan view of an adjustable aperture according to embodiments of the present application.

Referring to fig. 21, a first aperture adjustment device a is linked with the adjustable aperture to adjust the size of the adjustable aperture, and a second aperture adjustment device B is fixedly connected with the first aperture adjustment device a, and the second aperture adjustment device B slides back and forth along the optical axis to adjust the position of the adjustable aperture. Fig. 22 shows an exemplary configuration of the adjustable aperture. The adjustable aperture may include a plurality of blades 100. The plurality of leaves 100 may overlap each other around the aperture 200 through which light passes. The first aperture adjustment device a may include a mechanical driving structure to drive the plurality of blades 100, thereby adjusting the size of the aperture 200.

The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

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 (25)

1. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

a first lens having a positive refractive power, an object-side surface of which is convex;

a second lens having a negative optical power;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having a positive optical power; and

a sixth lens having optical power;

wherein the entrance pupil diameter EPD of the optical camera lens satisfies: 3.5mm < EPD < 6.4 mm.

2. Optical camera lens according to claim 1, characterized in that it further comprises an adjustable aperture, wherein,

the maximum distance STLmax from the adjustable diaphragm to the object side surface of the first lens, the minimum distance STLmin from the adjustable diaphragm to the object side surface of the first lens and the distance TTL from the object side surface of the first lens to the imaging surface of the optical camera lens on the optical axis satisfy the following conditions: 0 < (STLmax-STLmin)/TTL < 0.5.

3. The optical imaging lens of claim 1, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the total effective focal length f of the optical imaging lens satisfy: 1.5 < (f1-f2)/f < 2.

4. The optical imaging lens of claim 1, wherein a radius of curvature R12 of the image-side surface of the sixth lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0 < (R12-R6)/(R12+ R6) < 0.5.

5. The optical imaging lens according to claim 1, wherein a distance T45 between the fourth lens element and the fifth lens element on the optical axis and a distance Tr7r10 between an object side surface of the fourth lens element and an image side surface of the fifth lens element on the optical axis satisfy: 0.2 < T45/Tr7r10 < 0.5.

6. The optical imaging lens of claim 1, wherein the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 1 is less than or equal to CT3/CT4 is less than 1.5.

7. An optical imaging lens according to claim 1, wherein a center thickness CT6 of the sixth lens element and a distance BFL on the optical axis from an image side surface of the sixth lens element to an imaging surface of the optical imaging lens satisfy: 1 < CT6/BFL < 1.5.

8. The optical imaging lens according to claim 1, wherein a distance T34 on the optical axis between the third lens and the fourth lens and a center thickness CT3 of the third lens satisfy: 0.9 < T34/CT3 < 1.4.

9. The optical imaging lens according to claim 1, wherein a maximum effective radius DT12 of an image side surface of the first lens and a maximum effective radius DT62 of an image side surface of the sixth lens satisfy: 1 < DT12/DT62 < 1.3.

10. The optical imaging lens according to claim 1, wherein a maximum effective radius DT11 of an object side surface of the first lens, a maximum effective radius DT62 of an image side surface of the sixth lens, and a half ImgH of a diagonal length of an effective pixel region on an imaging surface of the optical imaging lens satisfy: DT11/DT62-DT11/ImgH < 0.1.

11. An optical imaging lens according to claim 1, wherein a combined focal length f123 of the first lens, the second lens, and the third lens and a total effective focal length f of the optical imaging lens satisfy: f123/f is more than 1.2 and less than 1.7.

12. The optical imaging lens according to claim 1, wherein a maximum field angle FOV of the optical imaging lens satisfies: tan (2FOV) < 10.

13. An optical imaging lens according to claim 2, wherein a first aperture adjustment device and a second aperture adjustment device are provided at a front end of the optical imaging lens, wherein:

the first aperture adjusting device is linked with the adjustable aperture to adjust the size of the adjustable aperture; and

the second aperture adjusting device is fixedly connected with the first aperture adjusting device, and slides back and forth along the optical axis to adjust the position of the adjustable aperture.

14. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:

an adjustable aperture;

a first lens having a positive refractive power, an object-side surface of which is convex;

a second lens having a negative optical power;

a third lens having optical power;

a fourth lens having an optical power;

a fifth lens having a positive optical power;

a sixth lens having optical power; and

at least one of the first lens to the sixth lens has an aspherical mirror surface;

the maximum distance STLmax from the adjustable diaphragm to the object side surface of the first lens, the minimum distance STLmin from the adjustable diaphragm to the object side surface of the first lens and the distance TTL from the object side surface of the first lens to the imaging surface of the optical camera lens on the optical axis satisfy the following conditions: 0 < (STLmax-STLmin)/TTL < 0.5.

15. The optical imaging lens of claim 14, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the total effective focal length f of the optical imaging lens satisfy: 1.5 < (f1-f2)/f < 2.

16. The optical imaging lens according to claim 14, wherein a maximum field angle FOV of the optical imaging lens satisfies: tan (2FOV) < 10.

17. An optical imaging lens according to claim 14, wherein a combined focal length f123 of the first lens, the second lens, and the third lens and a total effective focal length f of the optical imaging lens satisfy: f123/f is more than 1.2 and less than 1.7.

18. The optical imaging lens of claim 14, wherein a radius of curvature R12 of the image-side surface of the sixth lens and a radius of curvature R6 of the image-side surface of the third lens satisfy: 0 < (R12-R6)/(R12+ R6) < 0.5.

19. The optical imaging lens of claim 14, wherein a distance T45 between the fourth lens element and the fifth lens element on the optical axis and a distance Tr7r10 between an object-side surface of the fourth lens element and an image-side surface of the fifth lens element on the optical axis satisfy: 0.2 < T45/Tr7r10 < 0.5.

20. The optical imaging lens of claim 14, wherein the central thickness CT3 of the third lens and the central thickness CT4 of the fourth lens satisfy: 1 is less than or equal to CT3/CT4 is less than 1.5.

21. An optical imaging lens according to claim 14, wherein a center thickness CT6 of the sixth lens element and a distance BFL on the optical axis from an image side surface of the sixth lens element to an imaging surface of the optical imaging lens satisfy: 1 < CT6/BFL < 1.5.

22. The optical imaging lens of claim 14, wherein a distance T34 on the optical axis between the third lens and the fourth lens and a center thickness CT3 of the third lens satisfy: 0.9 < T34/CT3 < 1.4.

23. The optical imaging lens according to claim 14, wherein a maximum effective radius DT12 of an image side surface of the first lens and a maximum effective radius DT62 of an image side surface of the sixth lens satisfy: 1 < DT12/DT62 < 1.3.

24. The optical imaging lens according to claim 14, wherein a maximum effective radius DT11 of an object side surface of the first lens, a maximum effective radius DT62 of an image side surface of the sixth lens, and a half ImgH of a diagonal length of an effective pixel region on an imaging surface of the optical imaging lens satisfy: DT11/DT62-DT11/ImgH < 0.1.

25. An optical imaging lens according to claim 14, wherein a first aperture adjustment device and a second aperture adjustment device are provided at a front end of the optical imaging lens, wherein:

the first aperture adjusting device is linked with the adjustable aperture to adjust the size of the adjustable aperture; and

the second aperture adjusting device is fixedly connected with the first aperture adjusting device, and slides back and forth along the optical axis to adjust the position of the adjustable aperture.

Images