CN109358405B

CN109358405B - Image pickup lens system

Info

Publication number: CN109358405B
Application number: CN201811345622.2A
Authority: CN
Inventors: 贾远林; 徐武超
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2018-07-19
Filing date: 2018-07-19
Publication date: 2020-11-20
Anticipated expiration: 2038-07-19
Also published as: CN109358405A; CN108614347B; CN108614347A

Abstract

The application discloses a camera lens system, which comprises 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 and a fifth lens. Wherein the first lens has positive focal power; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive focal power, and the object side surface of the third lens is a concave surface; the fourth lens has focal power, and the object side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a concave surface; and the effective focal length f4 of the fourth lens and the total effective focal length f of the image pickup lens system satisfy 3 < | f4|/f < 9.

Description

Image pickup lens system

Divisional application statement

The present application is a divisional application of a chinese invention patent application with an invention name of "imaging lens system" filed on 2018, 07, 19 and an application number of 201810797030.8.

Technical Field

The present application relates to an image pickup lens system, and more particularly, to an image pickup lens system including five lenses.

Background

In recent years, with the development of portable electronic products such as smartphones, the camera lens system applied to the smartphone faces the challenges of high pixel, low cost, and miniaturization. Especially for the front lens of the mobile phone, under the condition of strictly controlling the cost, the five-piece front lens still occupies the mainstream position of the current market.

At present, the mobile phone market is increasingly pursuing high resolution and lightness of the camera lens, and large image plane and short system length become main factors considered by various large mobile phone manufacturers. The large image plane means that higher image resolution can be provided, and the short system length means that the lens can be more miniaturized and light and thin, and the cost can be better reduced.

Disclosure of Invention

The present application provides a camera lens system, such as a front camera lens of a mobile phone, that addresses at least, or partially addresses, at least one of the above-mentioned shortcomings of the prior art.

In one aspect, the present application provides an imaging lens system, 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 and a fifth lens. The first lens may have a positive optical power; the second lens can have negative focal power, and the image side surface of the second lens can be concave; the third lens can have positive focal power, and the object side surface of the third lens can be concave; the fourth lens has positive focal power or negative focal power, and the object side surface of the fourth lens can be a convex surface; the fifth lens element may have a positive optical power, and the image-side surface thereof may be concave. The effective focal length f4 of the fourth lens and the total effective focal length f of the image pickup lens system can satisfy 3 < | f4|/f < 9.

In one embodiment, the object side surface of the first lens may be convex.

In one embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R10 of the image-side surface of the fifth lens satisfy 3 ≦ (R4+ R10)/(R4-R10) < 10.

In one embodiment, the central thickness CT4 of the fourth lens element on the optical axis and the central thickness CT5 of the fifth lens element on the optical axis satisfy 0.2 < CT4/CT5 < 0.6.

In one embodiment, a sum Σ ET of edge thicknesses of each of the first to fifth lenses and a sum Σ CT of center thicknesses of the first to fifth lenses on the optical axis, respectively, may satisfy 0.5 < Σet/Σ CT < 0.9.

In one embodiment, the edge thickness ET1 of the first lens and the edge thickness ET2 of the second lens can satisfy 0.6 < ET1/ET2 < 1.

In one embodiment, a radius of curvature R9 of the object-side surface of the fifth lens and a total effective focal length f of the image pickup lens system may satisfy 0.2 < R9/f < 0.7.

In one embodiment, the edge thickness ET5 of the fifth lens and the central thickness CT5 of the fifth lens on the optical axis satisfy 0.35 < ET5/CT5 < 0.8.

In one embodiment, a sum Σ T of separation distances on an optical axis of any adjacent two lenses of the first to fifth lenses and a distance TTL on the optical axis of an object side surface of the first lens to an imaging surface of the image pickup lens system may satisfy 0.25 < ΣT/TTL ≦ 0.3.

In one embodiment, the total effective focal length f of the image pickup lens system and the effective focal length f3 of the third lens may satisfy 0 < f/f3 < 0.3.

In one embodiment, a separation distance T34 between the third lens and the fourth lens on the optical axis and a separation distance T45 between the fourth lens and the fifth lens on the optical axis may satisfy 2.0 < T34/T45 < 3.5.

In one embodiment, the object side surface of the fifth lens may have an inflection point, and the object side surface of the fifth lens has a convex portion in a paraxial region.

In one embodiment, a distance TTL from an object side surface of the first lens to an imaging surface of the image pickup lens system on an optical axis, an ImgH which is a half of a diagonal length of an effective pixel area on the imaging surface of the image pickup lens system, and an F-number Fno of the image pickup lens system may satisfy TTL × Fno/ImgH < 3.2.

In one embodiment, a distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the image pickup lens system and a half ImgH of a diagonal length of the effective pixel area on the imaging surface of the image pickup lens system may satisfy TTL/ImgH < 1.5.

This application has adopted five lens, through the focal power of rational distribution each lens, face type, the center thickness of each lens and the epaxial interval between each lens etc for above-mentioned camera lens system has at least one beneficial effect such as high image quality, miniaturization and low cost.

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 shows a schematic configuration diagram of an image pickup lens system according to embodiment 1 of the present application;

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens system of embodiment 1;

fig. 3 shows a schematic configuration diagram of an image pickup lens system according to embodiment 2 of the present application;

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens system of embodiment 2;

fig. 5 is a schematic configuration diagram showing an image pickup lens system according to embodiment 3 of the present application;

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens system of embodiment 3;

fig. 7 shows a schematic configuration diagram of an image pickup lens system according to embodiment 4 of the present application;

fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens system of embodiment 4;

fig. 9 shows a schematic configuration diagram of an image pickup lens system according to embodiment 5 of the present application;

fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens system of embodiment 5;

fig. 11 is a schematic configuration diagram showing an image pickup lens system according to embodiment 6 of the present application;

fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens system of embodiment 6;

fig. 13 is a schematic configuration diagram showing an image pickup lens system according to embodiment 7 of the present application;

fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens system of example 7.

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; the distance axis region is a region other than the vicinity of the optical axis, i.e., a region away from the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is concave 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. In each lens, the surface closer to the object side is referred to as the object side surface of the lens; in each lens, the surface closer to the image side is referred to as 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.

The image pickup lens system according to the exemplary embodiment of the present application may include, for example, five lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in sequence from an object side to an image side along an optical axis, and an air space is formed between every two adjacent lenses.

In an exemplary embodiment, the first lens may have a positive optical power; the second lens can have negative focal power, and the image side surface of the second lens can be concave; the third lens may have a positive optical power; the fourth lens has positive focal power or negative focal power, and the object side surface of the fourth lens can be a convex surface; the fifth lens element may have a positive optical power, and the image-side surface thereof may be concave. Alternatively, the object side surface of the third lens may be concave. The surface type and focal power of each lens are reasonably configured, so that the performance of an optical system is ensured, and meanwhile, tolerance sensitivity is reduced, and the optical system has better feasibility of mass production.

In an exemplary embodiment, the first lens may have a positive optical power; the second lens can have negative focal power, and the image side surface of the second lens can be concave; the third lens may have a positive optical power; the fourth lens has positive focal power or negative focal power, and the object side surface of the fourth lens can be a convex surface; the fifth lens element may have a positive optical power, and the image-side surface thereof may be concave. The surface type and focal power of each lens are reasonably configured, so that the performance of an optical system is ensured, and meanwhile, tolerance sensitivity is reduced, and the optical system has better feasibility of mass production.

In an exemplary embodiment, the object side surface of the first lens may be convex.

In an exemplary embodiment, the object side surface of the fifth lens may have at least one inflection point such that the object side surface of the fifth lens has at least one convex portion in a distal axis region. Optionally, the object side surface of the fifth lens may be convex. When the object side surface of the fifth lens is convex, the surface shape of the fifth lens at least changes from convex to concave and then changes from concave to convex from the paraxial region to the paraxial region. The surface type of the fifth lens is reasonably arranged, so that effective matching of the chief ray incident angle (CRA) of each view field and the chip can be realized, and the imaging quality is improved.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression TTL/ImgH < 1.5, where TTL is a distance on the optical axis from the object side surface of the first lens to the imaging surface of the image pickup lens system, and ImgH is half the length of the diagonal line of the effective pixel area on the imaging surface of the image pickup lens system. More specifically, TTL and ImgH can further satisfy 1.1 < TTL/ImgH < 1.5, e.g., 1.32 ≦ TTL/ImgH ≦ 1.42. The lens meets the condition that TTL/ImgH is less than 1.5, and the lens system can meet the requirement of high resolution while ensuring the miniaturization of the lens.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 3 ≦ (R4+ R10)/(R4-R10) < 10, where R4 is a radius of curvature of an image side surface of the second lens and R10 is a radius of curvature of an image side surface of the fifth lens. More specifically, R4 and R10 may further satisfy 3.00. ltoreq. R4+ R10)/(R4-R10. ltoreq.7.10. When the conditional expression of more than or equal to (R4+ R10)/(R4-R10) < 10 is satisfied, the focal power of the second lens can be reasonably adjusted, and further the miniaturization and manufacturability requirements of the lens system are realized.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy a conditional expression TTL × Fno/ImgH < 3.2, where TTL is a distance on an optical axis from an object side surface of the first lens to an imaging surface of the image pickup lens system, ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the image pickup lens system, and Fno is an F-number of the image pickup lens system. More specifically, TTL, Fno, and ImgH may further satisfy 2.6 < TTL XFno/ImgH < 3.0, for example, 2.73. ltoreq. TTL XFno/ImgH. ltoreq.2.91. The lens system meets the condition formula of TTL multiplied by Fno/ImgH less than 3.2, is beneficial to increasing the light inlet quantity of the system in unit time, and is beneficial to enabling the lens system to meet the requirements of miniaturization and high resolution.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 2.0 < T34/T45 < 3.5, where T34 is a separation distance of the third lens and the fourth lens on the optical axis, and T45 is a separation distance of the fourth lens and the fifth lens on the optical axis. More specifically, T34 and T45 can further satisfy 2.10. ltoreq. T34/T45. ltoreq.3.30. The method meets the conditional expression that T34/T45 is more than 2.0 and less than 3.5, can effectively configure the on-axis spacing distance between the lenses, reduces the gap sensitivity of the lens system, and realizes the field curvature correction.

In an exemplary embodiment, the imaging lens system of the present application may satisfy the conditional expression 0.2 < CT4/CT5 < 0.6, where CT4 is a central thickness of the fourth lens on the optical axis and CT5 is a central thickness of the fifth lens on the optical axis. More specifically, CT4 and CT5 may further satisfy 0.25 ≦ CT4/CT5 ≦ 0.57. The central thicknesses of the fourth lens and the fifth lens are reasonably configured, so that the thickness sensitivity of the lens can be effectively reduced, and the lens system can meet the requirement of processability.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 3 < | f4|/f < 9, where f4 is an effective focal length of the fourth lens and f is a total effective focal length of the image pickup lens system. More specifically, f4 and f further satisfy 3.69 ≦ f4|/f ≦ 8.44. The system focal power is reasonably configured, the compactness of the optical system structure can be ensured, and the miniaturization requirement is met.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 0.5 < ∑ ET/∑ CT < 0.9, where Σ ET is a sum of edge thicknesses of the respective first to fifth lenses, and Σ CT is a sum of center thicknesses of the respective first to fifth lenses on the optical axis. More specifically, Σ ET and Σ CT can further satisfy 0.68 ≦ Σ ET/Σ CT ≦ 0.74. The ratio of the total thickness of the edges of the first lens to the fifth lens to the total thickness of the center is reasonably configured, so that a large working image surface can be realized, and the miniaturization requirement can be met; meanwhile, the method is beneficial to balancing the field curvature of the edge and the central view field of the system and improving the imaging definition.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 0.6 < ET1/ET2 < 1, where ET1 is the edge thickness of the first lens and ET2 is the edge thickness of the second lens. More specifically, ET1 and ET2 can further satisfy 0.70 ≦ ET1/ET2 ≦ 0.96. By configuring the ratio of the edge thickness of the first lens to the edge thickness of the second lens, the effective focal power of the first lens and the effective focal power of the second lens can be indirectly reduced, so that tolerance sensitivity caused by the fact that a single lens bears large focal power is avoided, and the forming yield can be effectively improved.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 0.2 < R9/f < 0.7, where R9 is a radius of curvature of an object side surface of the fifth lens and f is a total effective focal length of the image pickup lens system. More specifically, R9 and f can further satisfy 0.32. ltoreq. R9/f. ltoreq.0.53. The conditional expression that R9/f is more than 0.2 and less than 0.7 is satisfied, the spherical aberration of the system can be effectively eliminated, and a high-definition image is obtained.

In an exemplary embodiment, the imaging lens system of the present application may satisfy the conditional expression 0.35 < ET5/CT5 < 0.8, where ET5 is an edge thickness of the fifth lens and CT5 is a center thickness of the fifth lens on the optical axis. More specifically, ET5 and CT5 can further satisfy 0.37 ≦ ET5/CT5 ≦ 0.67. The thickness ratio of the fifth lens is reasonably configured, so that the fifth lens meets the requirements of processability and manufacturability.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 0.25 < ∑ T/TTL ≦ 0.3, where Σ T is a sum of separation distances on an optical axis of any adjacent two lenses of the first lens to the fifth lens, and TTL is a distance on the optical axis from an object side surface of the first lens to an imaging surface of the image pickup lens system. More specifically, Σ T and TTL can further satisfy 0.26 ≦ Σ T/TTL ≦ 0.30. The spacing distance of each lens on the optical axis is reasonably configured, so that the gap sensitivity of the system can be effectively reduced, and the miniaturization requirement can be met.

In an exemplary embodiment, the image pickup lens system of the present application may satisfy the conditional expression 0 < f/f3 < 0.3, where f is the total effective focal length of the image pickup lens system, and f3 is the effective focal length of the third lens. More specifically, f and f3 further satisfy 0.04. ltoreq. f/f 3. ltoreq.0.18. The optical power of the third lens is configured, so that the structural compactness of the optical system can be ensured, the spherical aberration of the system can be corrected, and the imaging quality can be improved.

In an exemplary embodiment, the above-mentioned image pickup lens system may further include a diaphragm to improve the imaging quality of the lens. Alternatively, a diaphragm may be disposed between the object side and the first lens.

Alternatively, the above-described image pickup lens system may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an image formation surface.

The image pickup lens system according to the above-described embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface type, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the machinability of the lens can be improved, so that the camera lens system is more beneficial to production and processing and can be suitable for portable electronic products. Meanwhile, the camera lens system with the configuration has the advantages of high imaging quality, miniaturization, low cost and the like. The camera lens system can better meet the use requirements of the front lens of portable electronic products such as smart phones.

In the embodiment of the present application, at least one of the mirror surfaces of each 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 during imaging can be eliminated as much as possible, thereby improving the imaging quality.

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

Specific examples of the image pickup lens system applicable to the above-described embodiments are further described below with reference to the drawings.

Example 1

An image pickup lens system according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an image pickup lens system according to embodiment 1 of the present application.

As shown in fig. 1, an image capturing lens system according to an exemplary embodiment of the present application includes, in order from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave 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 concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative 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 convex object-side surface S9 and a concave image-side surface S10. The object side surface S9 of the fifth lens element E5 has an inflection point, so that the object side surface S9 has a surface type trend of changing from convex to concave and then from concave to convex at least from a paraxial region to a paraxial region. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens system of example 1, where the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 1

As can be seen from table 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. In the present embodiment, the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric 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 the conic coefficient (given in table 1); 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 S10 used in example 1₄、A₆、A₈、A₁₀、A₁₂、A₁₄、A₁₆、A₁₈And A₂₀。

Flour mark

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

1.5356E-03

-1.0187E-01

1.0051E+00

-5.4294E+00

1.6919E+01

-3.1768E+01

3.5386E+01

-2.1537E+01

5.5127E+00

S2

-1.4365E-01

2.3069E-01

9.7325E-01

-7.5359E+00

2.5886E+01

-5.2633E+01

6.4329E+01

-4.3781E+01

1.2752E+01

S3

-1.9511E-01

7.1307E-01

-2.3784E+00

1.4248E+01

-6.2710E+01

1.6757E+02

-2.6149E+02

2.1990E+02

-7.7080E+01

S4

-7.8984E-02

3.1200E-01

9.1230E-01

-1.1232E+01

5.8933E+01

-1.7907E+02

3.2091E+02

-3.1235E+02

1.2721E+02

S5

-2.2027E-01

3.1847E-02

2.8300E-01

-4.1537E+00

2.1766E+01

-6.0080E+01

9.3425E+01

-7.5484E+01

2.4429E+01

S6

-1.8226E-01

2.0035E-01

-1.2508E+00

5.2327E+00

-1.3744E+01

2.3595E+01

-2.5184E+01

1.5318E+01

-4.0558E+00

S7

-6.0005E-02

4.3767E-02

-1.1883E-01

1.0749E-01

-7.6214E-02

3.1202E-02

-2.4771E-03

-1.6979E-03

3.2506E-04

S8

-3.2993E-01

5.6706E-01

-7.6093E-01

6.7456E-01

-4.1511E-01

1.7154E-01

-4.4248E-02

6.3542E-03

-3.8584E-04

S9

-5.8474E-01

4.8490E-01

-3.3150E-01

1.6999E-01

-5.8418E-02

1.2922E-02

-1.7696E-03

1.3680E-04

-4.5709E-06

S10

-3.4125E-01

1.8948E-01

-6.7075E-02

2.3163E-03

8.8102E-03

-3.7667E-03

7.2040E-04

-6.7623E-05

2.5217E-06

TABLE 2

Table 3 gives the distance TTL on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1 of the imaging lens system in embodiment 1, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13, the F number Fno, the total effective focal length F, and the effective focal lengths F1 to F5 of the respective lenses.

TABLE 3

The imaging lens system in embodiment 1 satisfies the following relationship:

TTL/ImgH is 1.32, where TTL is the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S13 of the image pickup lens system, and ImgH is half the diagonal length of the effective pixel area on the imaging surface S13;

(R4+ R10)/(R4-R10) ═ 3.80, where R4 is the radius of curvature of the image-side surface S4 of the second lens E2, and R10 is the radius of curvature of the image-side surface S10 of the fifth lens E5;

TTL × Fno/ImgH is 2.73, where TTL is an axial distance from the object side surface S1 of the first lens element E1 to the imaging surface S13 of the image pickup lens system, ImgH is a half of a diagonal length of an effective pixel area on the imaging surface S13, and Fno is an F-number of the image pickup lens system;

T34/T45 is 2.76, where T34 is the distance between the third lens E3 and the fourth lens E4 on the optical axis, and T45 is the distance between the fourth lens E4 and the fifth lens E5 on the optical axis;

CT4/CT5 is 0.57, where CT4 is the central thickness of the fourth lens E4 on the optical axis, and CT5 is the central thickness of the fifth lens E5 on the optical axis;

i f4 i/f 4.08, where f4 is the effective focal length of the fourth lens E4, and f is the total effective focal length of the image capture lens system;

Σ ET/Σ CT is 0.71, where Σ ET is the sum of the edge thicknesses of the respective lenses of the first lens E1 to the fifth lens E5, and Σ CT is the sum of the center thicknesses of the first lens E1 to the fifth lens E5 on the optical axis, respectively;

ET1/ET2 is 0.96, where ET1 is the edge thickness of the first lens E1, and ET2 is the edge thickness of the second lens E2;

r9/f is 0.41, where R9 is the radius of curvature of the object-side surface S9 of the fifth lens E5, and f is the total effective focal length of the imaging lens system;

ET5/CT5 is 0.65, where ET5 is the edge thickness of the fifth lens E5, and CT5 is the central thickness of the fifth lens E5 on the optical axis;

Σ T/TTL is 0.27, where Σ T is a sum of distances between any two adjacent lenses of the first lens E1 to the fifth lens E5 on the optical axis, and TTL is a distance between the object-side surface S1 of the first lens E1 and the image-forming surface S13 on the optical axis;

f/f3 is 0.12, where f is the total effective focal length of the image capture lens system, and f3 is the effective focal length of the third lens E3.

Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens system of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the image pickup lens system of embodiment 1. Fig. 2C shows a distortion curve of the image pickup lens system of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the imaging lens system of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the imaging lens system according to embodiment 1 can achieve good image quality.

Example 2

An image pickup lens system according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. 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 configuration diagram of an image pickup lens system according to embodiment 2 of the present application.

As shown in fig. 3, the image capturing lens system according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens system of example 2, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 4

As is clear from table 4, in example 2, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 5 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 5

Table 6 gives the distance TTL on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1 of the image pickup lens system in embodiment 2, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13, the F number Fno, the total effective focal length F, and the effective focal lengths F1 to F5 of the respective lenses.

TABLE 6

Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens system of embodiment 2, 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 a meridional field curvature and a sagittal field curvature of the image pickup lens system of embodiment 2. Fig. 4C shows a distortion curve of the image pickup lens system of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the imaging lens system of embodiment 2, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the imaging lens system according to embodiment 2 can achieve good image quality.

Example 3

An image pickup lens system according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an image pickup lens system according to embodiment 3 of the present application.

As shown in fig. 5, the image capturing lens system according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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 concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative 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 convex object-side surface S9 and a concave image-side surface S10. The object side surface S9 of the fifth lens element E5 has an inflection point, so that the object side surface S9 has a surface type trend of changing from convex to concave and then from concave to convex at least from a paraxial region to a paraxial region. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens system of example 3, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 7

As is clear from table 7, in example 3, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 8 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 8

Table 9 gives the distance TTL on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1 of the imaging lens system in embodiment 3, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13, the F number Fno, the total effective focal length F, and the effective focal lengths F1 to F5 of the respective lenses.

TABLE 9

Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens system of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the image pickup lens system of embodiment 3. Fig. 6C shows a distortion curve of the image pickup lens system of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the imaging lens system of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging lens system according to embodiment 3 can achieve good image quality.

Example 4

An image pickup lens system according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an image pickup lens system according to embodiment 4 of the present application.

As shown in fig. 7, the image capturing lens system according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

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 concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative 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 convex object-side surface S9 and a concave image-side surface S10. The object side surface S9 of the fifth lens element E5 has an inflection point, so that the object side surface S9 has a surface type trend of changing from convex to concave and then from concave to convex at least from a paraxial region to a paraxial region. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens system of example 4, where the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 10

As can be seen from table 10, in example 4, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 11 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.

TABLE 11

Table 12 gives the distance TTL on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1 of the imaging lens system in embodiment 4, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13, the F number Fno, the total effective focal length F, and the effective focal lengths F1 to F5 of the respective lenses.

TABLE 12

Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens system of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the image pickup lens system of embodiment 4. Fig. 8C shows a distortion curve of the image pickup lens system of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the imaging lens system of embodiment 4, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens system according to embodiment 4 can achieve good image quality.

Example 5

An image pickup lens system according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an image pickup lens system according to embodiment 5 of the present application.

As shown in fig. 9, the image capturing lens system according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave 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 negative 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 convex object-side surface S9 and a concave image-side surface S10. The object side surface S9 of the fifth lens element E5 has an inflection point, so that the object side surface S9 has a surface type trend of changing from convex to concave and then from concave to convex at least from a paraxial region to a paraxial region. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens system of example 5, where the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 13

As is clear from table 13, in example 5, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 14 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 14

Table 15 gives the distance TTL on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1 of the imaging lens system in embodiment 5, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13, the F number Fno, the total effective focal length F, and the effective focal lengths F1 to F5 of the respective lenses.

Watch 15

Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens system of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the image pickup lens system of embodiment 5. Fig. 10C shows a distortion curve of the image pickup lens system of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the imaging lens system of embodiment 5, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens system according to embodiment 5 can achieve good image quality.

Example 6

An image pickup lens system according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an image pickup lens system according to embodiment 6 of the present application.

As shown in fig. 11, the image capturing lens system according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave 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 concave object-side surface S5 and a convex 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 positive power, and has a convex object-side surface S9 and a concave image-side surface S10. The object side surface S9 of the fifth lens element E5 has an inflection point, so that the object side surface S9 has a surface type trend of changing from convex to concave and then from concave to convex at least from a paraxial region to a paraxial region. Filter E6 has an object side S11 and an image side S12. The light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.

Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens system of example 6, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

TABLE 16

As is clear from table 16, in example 6, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 17 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

TABLE 17

Table 18 gives the distance TTL on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1 of the imaging lens system in embodiment 6, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13, the F number Fno, the total effective focal length F, and the effective focal lengths F1 to F5 of the respective lenses.

Watch 18

Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens system of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens system of embodiment 6. Fig. 12C shows a distortion curve of the image pickup lens system of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve of the imaging lens system of embodiment 6, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens system according to embodiment 6 can achieve good image quality.

Example 7

An image pickup lens system according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an image pickup lens system according to embodiment 7 of the present application.

As shown in fig. 13, the image capturing lens system according to the exemplary embodiment of the present application, in order from an object side to an image side along an optical axis, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an image forming surface S13.

Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens system of example 7, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).

Watch 19

As is clear from table 19, in example 7, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fifth lens element E5 are aspheric. Table 20 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.

Watch 20

Table 21 gives the distance TTL on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1 of the image pickup lens system in embodiment 7, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S13, the F number Fno, the total effective focal length F, and the effective focal lengths F1 to F5 of the respective lenses.

TABLE 21

Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens system of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens system of embodiment 7. Fig. 14C shows a distortion curve of the image pickup lens system of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a chromatic aberration of magnification curve of the imaging lens system of embodiment 7, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the imaging lens system according to embodiment 7 can achieve good image quality.

In summary, examples 1 to 7 each satisfy the relationship shown in table 22.

TABLE 22

The present application also provides an image pickup apparatus, wherein the electronic photosensitive element may be a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The camera device may be a stand-alone camera device such as a digital camera, or may be a camera module integrated on a mobile electronic device such as a mobile phone. The image pickup apparatus is equipped with the image pickup lens system 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 those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above 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

1. An imaging lens system in which the number of lenses having refractive power is five, and the lenses are a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, the first lens to the fifth lens being 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 positive optical power;

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

the third lens has positive focal power, and the object side surface of the third lens is a concave surface;

the fourth lens has focal power, and the object side surface of the fourth lens is a convex surface;

the fifth lens has positive focal power, and the image side surface of the fifth lens is a concave surface; and

the effective focal length f4 of the fourth lens and the total effective focal length f of the image pickup lens system satisfy 3 < | f4|/f < 9;

the curvature radius R4 of the image side surface of the second lens and the curvature radius R10 of the image side surface of the fifth lens meet the requirement that (R4+ R10)/(R4-R10) < 10.

2. The imaging lens system of claim 1, wherein the object side surface of the first lens is convex.

3. The imaging lens system according to claim 1, wherein an edge thickness ET1 of the first lens and an edge thickness ET2 of the second lens satisfy 0.6 < ET1/ET2 < 1.

4. The image-pickup lens system according to claim 1, wherein a radius of curvature R9 of an object-side surface of the fifth lens and a total effective focal length f of the image-pickup lens system satisfy 0.2 < R9/f < 0.7.

5. The imaging lens system according to claim 1, wherein an edge thickness ET5 of the fifth lens and a center thickness CT5 of the fifth lens on the optical axis satisfy 0.35 < ET5/CT5 < 0.8.

6. The image pickup lens system according to claim 1, wherein a total effective focal length f of the image pickup lens system and an effective focal length f3 of the third lens satisfy 0 < f/f3 < 0.3.

7. The imaging lens system of claim 1, wherein a central thickness CT4 of the fourth lens element on the optical axis and a central thickness CT5 of the fifth lens element on the optical axis satisfy 0.2 < CT4/CT5 < 0.6.

8. The image pickup lens system according to any one of claims 1 to 7, wherein a sum Σ ET of edge thicknesses of each of the first to fifth lenses and a sum Σ CT of center thicknesses of the first to fifth lenses on the optical axis respectively satisfy 0.5 ∑ ET/Σ CT < 0.9.

9. The image pickup lens system according to any one of claims 1 to 7, wherein a sum Σ T of separation distances on the optical axis of any adjacent two lenses out of said first lens to said fifth lens and a distance TTL on the optical axis from an object side surface of said first lens to an image forming surface of said image pickup lens system satisfy 0.25 < Σt/TTL ≦ 0.3.

10. The image pickup lens system according to claim 9, wherein a separation distance T34 on the optical axis between the third lens and the fourth lens and a separation distance T45 on the optical axis between the fourth lens and the fifth lens satisfy 2.0 < T34/T45 < 3.5.

11. The imaging lens system according to any one of claims 1 to 7, wherein an object side surface of the fifth lens has an inflection point, and the object side surface of the fifth lens has a convex portion in a paraxial region.

12. The imaging lens system according to any one of claims 1 to 7, wherein a distance TTL on the optical axis from an object side surface of the first lens to an imaging surface of the imaging lens system, an ImgH which is half a diagonal length of an effective pixel area on the imaging surface of the imaging lens system, and an F-number Fno of the imaging lens system satisfy TTL x Fno/ImgH < 3.2.

13. The imaging lens system according to claim 10, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens system on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens system satisfy TTL/ImgH < 1.5.