CN106950681B - Camera lens - Google Patents

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Publication number
CN106950681B
CN106950681B CN201710362676.9A CN201710362676A CN106950681B CN 106950681 B CN106950681 B CN 106950681B CN 201710362676 A CN201710362676 A CN 201710362676A CN 106950681 B CN106950681 B CN 106950681B
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lens
imaging
image
focal length
effective focal
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CN106950681A (en
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戴付建
闻人建科
贺凌波
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN201710362676.9A priority Critical patent/CN106950681B/en
Publication of CN106950681A publication Critical patent/CN106950681A/en
Priority to PCT/CN2017/102428 priority patent/WO2018214349A1/en
Priority to US16/067,108 priority patent/US10962740B2/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses

Abstract

The application discloses a camera lens, which has a total effective focal length f and an entrance pupil diameter EPD, and sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side along an optical axis, wherein the first lens and the sixth lens both have positive focal power; the second lens, the third lens, the fifth lens and the seventh lens all have positive focal power or negative focal power; and the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface and the image side surface of the fourth lens is a convex surface. The total effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens meet the condition that f/EPD is less than or equal to 1.7.

Description

Camera lens
Technical Field
The present invention relates to an image pickup lens, and more particularly, to an image pickup lens including seven lenses.
Background
In recent years, with the development of science and technology, portable electronic products have been gradually raised, and more people enjoy portable electronic products having an image capturing function, so that the demand of the market for an image capturing lens suitable for portable electronic products has been gradually increased. As portable electronic products tend to be miniaturized, the total length of the lens is limited, thereby increasing the design difficulty of the lens. The photosensitive element of the currently used camera lens is typically a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor). With the improvement of the performance and the reduction of the size of the CCD and the cmos elements, higher requirements are put on the high imaging quality and the miniaturization of the associated imaging lens.
In order to meet the requirement of miniaturization, the f-number Fno (effective focal length of the lens/entrance pupil diameter of the lens) generally configured in the existing lens is 2.0 or more than 2.0, so that the size of the lens is reduced and the optical performance is good. However, with the continuous development of portable electronic products such as smartphones, higher requirements are put forward on camera lenses, especially for situations of insufficient light (such as overcast and rainy days, dusk, etc.) and hand trembling, so that the f-number Fno of 2.0 or more than 2.0 cannot meet higher-order imaging requirements.
Therefore, there is a need for an image pickup lens having an ultra-thin large aperture, excellent image quality, and low sensitivity, which is applicable to portable electronic products.
Disclosure of Invention
The technical solution provided by the present application at least partially solves the technical problems described above.
According to an aspect of the present application, there is provided an imaging lens having a total effective focal length f and an entrance pupil diameter EPD, and including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens and the sixth lens each have a positive power; the second lens, the third lens, the fifth lens and the seventh lens all have positive focal power or negative focal power; and the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface and the image side surface of the fourth lens is a convex surface. The total effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens can meet the condition that f/EPD is less than or equal to 1.7.
The system has the advantages that a plurality of (for example, seven) lenses are adopted, and the relationship between the total effective focal length and the entrance pupil diameter of the camera lens is reasonably distributed, so that the system has the advantage of a large aperture in the process of increasing the light transmission quantity, and the imaging effect in a dark environment is enhanced; while reducing aberrations in the fringe field.
According to another aspect of the present application, there is provided an imaging lens having a total effective focal length f and an entrance pupil diameter EPD, and including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, wherein the first lens and the sixth lens each have a positive power; the second lens, the third lens, the fifth lens and the seventh lens all have positive focal power or negative focal power; and the fourth lens has negative focal power, and the object side surface of the fourth lens is a concave surface and the image side surface of the fourth lens is a convex surface. The total effective focal length f of the camera lens and the effective focal length f5 of the fifth lens can satisfy 0 < f/f5 < 1.0.
In one embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the camera lens can meet the condition that TTL/ImgH is less than or equal to 1.85.
In one embodiment, the object-side surface of the first lens element can be convex and the image-side surface can be concave; the object side surface of the second lens can be a convex surface, and the image side surface can be a concave surface; and the object-side surface and the image-side surface of the sixth lens may both be convex at the paraxial region.
In one embodiment, the total effective focal length f of the camera lens and the effective focal length f1 of the first lens can satisfy 0.5 ≦ f/f1 ≦ 1.0.
In one embodiment, the total effective focal length f of the image pickup lens and the effective focal length f5 of the fifth lens may satisfy 0 < f/f5 < 1.0.
In one embodiment, the total effective focal length f of the image pickup lens and the effective focal length f7 of the seventh lens may satisfy-2 < f/f7 < 0.
In one embodiment, the effective focal length f1 of the first lens and the effective focal length f3 of the third lens can satisfy 0 < f1/f3 < 1.0.
In one embodiment, the effective focal length f1 of the first lens and the effective focal length f4 of the fourth lens can satisfy-1.0 ≦ f1/f4 < 0.
In one embodiment, the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens can satisfy-2.5 < f6/f7 ≦ -1.0.
In one embodiment, the central thickness CT5 of the fifth lens and the central thickness CT6 of the sixth lens can satisfy 0.5 < CT5/CT6 ≦ 1.0.
In one embodiment, the air space T23 on the optical axis of the second lens and the third lens and the center thickness CT3 of the third lens may satisfy 0 < T23/CT3 < 1.0.
In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy-1.5 < R3/R8 < 0.
In one embodiment, the radius of curvature R4 of the image-side surface of the second lens and the radius of curvature R7 of the object-side surface of the fourth lens satisfy-1.5 < R4/R7 < -0.5.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy | (R7-R8)/(R7+ R8) | < 1.0.
The camera lens with the configuration can further have at least one of the advantages of miniaturization, low sensitivity, better assembly manufacturability, high imaging quality and the like.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;
fig. 2A to 2D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 1;
fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;
fig. 4A to 4D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 2;
fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;
fig. 6A to 6D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 3;
fig. 7 is a schematic configuration diagram showing an imaging lens according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 4;
fig. 9 is a schematic configuration diagram showing an imaging lens according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 5;
fig. 11 is a schematic configuration diagram showing an imaging lens according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 6;
fig. 13 is a schematic configuration diagram showing an imaging lens according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 7;
fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application;
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 8;
fig. 17 shows a schematic configuration diagram of an imaging lens according to embodiment 9 of the present application;
fig. 18A to 18D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens of example 9.
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.
The paraxial region refers to a region near the optical axis. Herein, a surface closest to the object in each lens is referred to as an object side surface, and a surface closest to the imaging surface in each lens is referred to as an image side surface.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after the list of listed features, that 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 image pickup lens according to an exemplary embodiment of the present application has, for example, seven lenses, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in order from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a positive or negative optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens element can have negative focal power, and the object-side surface can be a concave surface and the image-side surface can be a convex surface; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive optical power; and the seventh lens may have a positive power or a negative power.
In addition, the object side surface of the first lens can be a convex surface, and the image side surface of the first lens can be a concave surface; the object side surface of the second lens can be a convex surface, and the image side surface can be a concave surface; the object-side surface of the sixth lens element can be convex in the paraxial region thereof, and the image-side surface can be convex in the paraxial region thereof. Such an arrangement is advantageous in reducing aberrations of the fringe field of view in increasing the amount of light flux. The configuration of the first lens is beneficial to dispersing positive focal power, avoiding excessive concentration of focal power and effectively reducing chromatic spherical aberration and axial chromatic aberration.
The total effective focal length f of the above-described imaging lens according to the exemplary embodiment of the present application and the entrance pupil diameter EPD of the imaging lens may satisfy f/EPD ≦ 1.7, and more particularly, f and EPD may further satisfy 1.53 ≦ f/EPD ≦ 1.55. The camera lens is configured to satisfy the condition that f/EPD is less than or equal to 1.7, so that the system has the advantage of a large aperture in the process of increasing the light transmission quantity, and the imaging effect in a dark environment is enhanced while the aberration of the edge field is reduced.
The reduction of the f-number Fno (i.e. f/EPD) can effectively improve the image surface brightness, so that the lens can better meet the shooting requirements when the light is insufficient (for example, at night, in rainy days, at dusk, and the like). The reduction of the f-number Fno in a small range of values can produce better effects in the aspects of improving brightness, highlighting emphasis, blurring background and the like. The lens assembly of fno1.8 has been used in the prior art, but cannot be further reduced due to constraints of other factors. In the present application, this parameter can be further reduced to 1.7, and although the difference between fno1.7 and fno1.8 is small, the energy ratio of the lens assembly with fno1.7 on the image plane exceeds that of the lens assembly with fno1.8 by about 12%, so that the image plane brightness can be effectively improved, and the requirement of night photography can be better satisfied. In addition, the lens assembly with parameter fno1.7 has a shorter depth of field relative to fno1.8. For example, when an object 2 meters away is photographed at the same time, the depth of field of the lens assembly with the parameter fno1.7 is about 7% smaller than that of the lens assembly with the parameter fno1.8, so that the user has a more excellent experience in highlighting and blurring the background. That is, although fno1.7 and fno1.8 differ only in value by 0.1, the lens assembly having the parameter fno1.7 is significantly superior to the lens assembly having the parameter fno1.8 in practical technical efficiency.
The distance TTL between the object side surface of the first lens and the imaging surface of the camera lens on the optical axis and the half of the length ImgH of the diagonal line of the effective pixel area on the imaging surface of the camera lens can meet the condition that TTL/ImgH is less than or equal to 1.85, and more specifically, TTL and ImgH can further meet the condition that TTL/ImgH is less than or equal to 1.47 and less than or equal to 1.85. This can effectively compress the overall size of the imaging lens, thereby achieving the ultra-thin characteristics and miniaturization of the imaging lens.
In order to effectively enlarge the field angle of the lens, correct aberrations, reduce the sensitivity of the optical system, and improve the imaging quality of the lens, the effective focal lengths of the respective lenses can be arranged reasonably.
Between the total effective focal length f of the image pickup lens and the effective focal length f1 of the first lens, 0.5 ≦ f/f1 ≦ 1.0, and more specifically, f and f1 may further satisfy 0.52 ≦ f/f1 ≦ 0.97. For a lens in which the first lens is positive power, the back focus is not easily lengthened. When the absolute value of the ratio of f/f1 is too small, it is disadvantageous to achieve a large field angle and a long back focus, and when the absolute value of the ratio of f/f1 is too large, it introduces more aberration while increasing the difficulty of manufacturing the lens.
The total effective focal length f of the image pickup lens and the effective focal length f5 of the fifth lens can satisfy 0 < f/f5 < 1.0, and more specifically, f and f5 can further satisfy 0.19 ≦ f/f5 ≦ 0.56. The focal length of the fifth lens is too long, the function of correcting aberration cannot be achieved, the fifth lens is too short and is not beneficial to processing, and the lens meeting the requirement that f/f5 is more than 0 and less than 1.0 can simultaneously achieve high imaging quality and good manufacturability.
The total effective focal length f of the camera lens and the effective focal length f7 of the seventh lens can satisfy-2 < f/f7 < 0, and more specifically, f and f7 further satisfy-1.80 < f/f7 < 1.30. The reasonable arrangement of the total effective focal length f of the image pickup lens and the effective focal length f7 of the seventh lens helps to shorten the total length of the optical system and simultaneously helps to correct aberrations.
An effective focal length f1 of the first lens and an effective focal length f3 of the third lens may satisfy 0 < f1/f3 < 1.0, and more specifically, f1 and f3 may further satisfy 0.34 ≦ f1/f3 ≦ 0.75. When the ratio f1/f3 is too large, the first lens needs to bear too much power, the manufacturability is too poor and the correction of aberration is not good; when the ratio of f1/f3 is too small, the aperture of the third lens is not easy to be made large, resulting in poor assembly manufacturability. When f1/f3 is more than 0 and less than 1.0, the manufacturability and the assembling manufacturability of the lens can be effectively ensured.
An effective focal length f1 of the first lens and an effective focal length f4 of the fourth lens may satisfy-1.0. ltoreq. f1/f4 < 0, and more specifically, f1 and f4 may further satisfy-0.98. ltoreq. f1/f 4. ltoreq. f 0.13. The reasonable distribution of the focal power of the first lens and the fourth lens can effectively reduce the aberration of the whole system and reduce the sensitivity of the system.
The effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens can satisfy-2.5 < f6/f7 ≦ -1.0, and more specifically, f6 and f7 can further satisfy-2.18 ≦ f6/f7 ≦ -1.04. The sixth lens and the seventh lens cooperate with each other to correct chromatic aberration of the system. When the ratio of f6/f7 is too large, the correction of chromatic aberration is not facilitated; when the ratio f6/f7 is too small, the manufacturability of the sixth lens is not favorable. When f6/f7 is more than-2.5 and less than or equal to-1.0, the two aspects of the lens image quality and the manufacturability can be effectively considered.
In application, the central thickness of each lens and the air interval of each lens on the optical axis can be reasonably arranged. For example, the central thickness CT5 of the fifth lens and the central thickness CT6 of the sixth lens may satisfy 0.5 < CT5/CT6 ≦ 1.0, and more specifically, CT5 and CT6 may further satisfy 0.64 ≦ CT5/CT6 ≦ 0.97. When the ratio of CT5/CT6 is too large, the chromatic aberration is not eliminated; when the ratio of CT5/CT6 is too small, the fifth lens is too thin and the manufacturability is not good. When the ratio of CT5/CT6 is more than 0.5 and less than or equal to 1.0, the two aspects of chromatic aberration and manufacturability can be effectively balanced. For another example, the air space T23 on the optical axis between the second lens and the third lens and the center thickness CT3 of the third lens may satisfy 0 < T23/CT3 < 1.0, and more specifically, T23 and CT3 may further satisfy 0.37 ≦ T23/CT3 ≦ 0.77. When the ratio of T23/CT3 is too large, the miniaturization of the system is not facilitated; when the ratio of T23/CT3 is too small, ghost images are likely to be formed. When 0 < T23/CT3 < 1.0, the two aspects of system miniaturization and ghost image risk can be effectively balanced.
In addition, the curvature radius of each mirror surface can be reasonably arranged. For example, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy-1.5 < R3/R8 < 0, and more specifically, R3 and R8 may further satisfy-1.39 ≦ R3/R8 ≦ -0.86. The second lens and the fourth lens are matched with each other, so that chromatic aberration of the system can be corrected. When the ratio of R3/R8 is too large or too small, the correction of chromatic aberration is not favorable. When-1.5 < R3/R8 < 0, the balance of various aberrations can be achieved. As another example, a radius of curvature R4 of the image-side surface of the second lens element and a radius of curvature R7 of the object-side surface of the fourth lens element may satisfy-1.5 < R4/R7 < -0.5, more specifically, -1.42 < R4/R7 < 0.83. The reasonable arrangement of the curvature radius R4 of the image side surface of the second lens and the curvature radius R7 of the object side surface of the fourth lens helps to correct chromatic aberration of the system and achieve balance of various aberrations. For another example, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens satisfy | (R7-R8)/(R7+ R8) | < 1.0, more specifically, 0.08 ≦ | (R7-R8)/(R7+ R8) | ≦ 0.35. The reasonable arrangement of the curvature radius of the object-side surface and the image-side surface of the fourth lens helps to correct the aberration of the whole system.
In the embodiment of the present application, a stop STO may also be provided between, for example, the object side and the first lens to effectively contract light entering the imaging lens, thereby improving the imaging quality of the lens. It should be understood by those skilled in the art that the stop STO may be disposed at other positions as needed, that is, the disposition of the stop STO should not be limited to the positions shown in the embodiments.
The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, seven lenses as described above. Through reasonable distribution of focal power, surface type, center thickness of each lens, on-axis distance between each lens and the like, the aperture of the camera lens can be effectively enlarged, the system sensitivity is reduced, the miniaturization of the lens is ensured, and the imaging quality is improved, so that the camera lens is more beneficial to production and processing and is applicable to portable electronic products. 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 to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the lens barrel may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiment, the imaging lens is not limited to including seven lenses. The camera lens may also include other numbers of lenses, if desired.
Specific examples of an imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An imaging lens 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 imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object side surface S3 and an image side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging surface S15.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 1.
Flour mark Surface type Radius of curvature Thickness of Material Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface All-round -0.4485
S1 Aspherical surface 1.8401 0.6693 1.55,56.1 0.7008
S2 Aspherical surface 3.8521 0.0615 -9.0405
S3 Aspherical surface 2.6332 0.2300 1.66,21.0 -29.4457
S4 Aspherical surface 2.4906 0.3184 2.5257
S5 Aspherical surface 20.3984 0.4368 1.55,56.1 0.1748
S6 Aspherical surface -8.6896 0.1964 1.4731
S7 Aspherical surface -1.8018 0.2300 1.66,21.0 1.0617
S8 Aspherical surface -2.8621 0.0301 2.0353
S9 Aspherical surface 2.9251 0.3583 1.61,28.7 1.7796
S10 Aspherical surface 3.7756 0.3375 2.1160
S11 Aspherical surface 16.5791 0.5217 1.55,48.3 -0.7179
S12 Aspherical surface -1.6209 0.3616 -7.5711
S13 Aspherical surface -33.4884 0.3052 1.54,55.8 -0.1502
S14 Aspherical surface 1.2411 0.9935 -7.2208
S15 Spherical surface All-round 0
TABLE 1
As can be seen from table 1, the center thickness CT5 of the fifth lens E5 and the center thickness CT6 of the sixth lens E6 satisfy CT5/CT6 of 0.69; the air interval T23 of the second lens E2 and the third lens E3 on the optical axis and the center thickness CT3 of the third lens E3 meet the condition that T23/CT3 is 0.73; the radius of curvature R3 of the object-side surface S3 of the second lens E2 and the radius of curvature R8 of the image-side surface S8 of the fourth lens E4 satisfy-0.92 of R3/R8; the radius of curvature R4 of the image side surface S4 of the second lens E2 and the radius of curvature R7 of the object side surface S7 of the fourth lens E4 satisfy-1.38 of R4/R7; the radius of curvature R7 of the object-side surface S7 of the fourth lens E4 and the radius of curvature R8 of the image-side surface S8 of the fourth lens E4 satisfy | (R7-R8)/(R7+ R8) | ═ 0.23.
The embodiment adopts seven lenses as an example, and effectively enlarges the aperture of the lens, shortens the total length of the lens and ensures the large aperture and miniaturization of the lens by reasonably distributing the focal length and the surface type of each lens; meanwhile, various aberrations are corrected, and the resolution and the imaging quality of the lens are improved. Each aspherical surface type x is defined by the following formula:
Figure BDA0001300773800000111
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 above); ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the coefficients A of the higher-order terms which can be used for the mirrors S1-S14 in example 14、A6、A8、A10、A12、A14、A16And A18。
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -1.9446E-02 1.8787E-02 -6.0659E-02 7.2138E-02 -5.4789E-02 2.1341E-02 -4.3067E-03 0
S2 -1.0518E-01 3.5215E-02 7.9487E-02 -1.5270E-01 1.1699E-01 -4.5084E-02 7.0785E-03 0
S3 3.7322E-02 -3.0847E-01 6.4488E-01 -7.2454E-01 4.8782E-01 -1.7827E-01 2.8152E-02 0
S4 -7.0612E-02 -8.5634E-02 3.0419E-01 -5.2379E-01 5.7272E-01 -3.5707E-01 9.9431E-02 0
S5 -4.7990E-02 2.7173E-02 -2.3605E-01 4.8654E-01 -6.0083E-01 3.8388E-01 -1.0138E-01 0
S6 -7.3247E-02 -8.4803E-02 1.5642E-01 -3.4743E-01 3.7351E-01 -1.8439E-01 3.3359E-02 0
S7 1.1996E-01 -3.0758E-01 5.9990E-01 -9.0972E-01 9.0644E-01 -4.7901E-01 1.0745E-01 0
S8 2.6017E-02 -1.3501E-02 4.3233E-02 -1.3072E-01 1.5425E-01 -8.1207E-02 1.7034E-02 0
S9 -2.0080E-01 2.1662E-01 -2.1382E-01 1.3924E-01 -6.7592E-02 1.9815E-02 -2.3694E-03 0
S10 -1.1381E-01 -8.0996E-03 6.0884E-02 -5.2995E-02 1.7671E-02 -1.9276E-03 -2.4691E-05 0
S11 9.0061E-02 -5.7464E-02 -1.3144E-02 3.2192E-02 -2.4909E-02 7.9341E-03 -8.6038E-04 0
S12 8.9992E-02 1.1066E-03 -1.0814E-02 -1.2657E-02 8.7832E-03 -1.8587E-03 1.3320E-04 0
S13 -1.5663E-01 8.2344E-02 -3.9011E-02 1.5862E-02 -4.0456E-03 5.9186E-04 -4.5915E-05 1.4710E-06
S14 -1.0864E-01 5.9943E-02 -2.6496E-02 7.9168E-03 -1.5184E-03 1.7686E-04 -1.1201E-05 2.9246E-07
TABLE 2
Table 3 shown below gives effective focal lengths f1 to f7 of the respective lenses of embodiment 1, a total effective focal length f of the imaging lens, an optical total length TTL of the imaging lens (i.e., a distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens), and ImgH which is half the diagonal length of the effective pixel area on the imaging surface S17.
Figure BDA0001300773800000112
Figure BDA0001300773800000121
TABLE 3
As can be seen from table 3, f/f1 is 0.69 between the total effective focal length f of the imaging lens and the effective focal length f1 of the first lens E1; f/f5 of 0.22 is satisfied between the total effective focal length f of the imaging lens and the effective focal length f5 of the fifth lens E5; f/f7 is equal to-1.80 between the total effective focal length f of the image pickup lens and the effective focal length f7 of the seventh lens E7; f1/f3 of the first lens E1 and the third lens E3 is equal to 0.51 between the effective focal length f1 and the effective focal length f 3; an effective focal length f1 of the first lens E1 and an effective focal length f4 of the fourth lens E4 satisfy the condition that f1/f4 is-0.72; an effective focal length f6 of the sixth lens E6 and an effective focal length f7 of the seventh lens E7 satisfy the condition that f6/f7 is-1.21; the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 of the imaging lens on the optical axis and the half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the imaging lens satisfy TTL/ImgH to 1.47.
In addition, in the present embodiment, the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy f/EPD of 1.55.
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 2B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents the distortion magnitude values in the case of different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 2A to 2D, the imaging lens system according to embodiment 1 can achieve good imaging quality.
Example 2
An imaging lens 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 imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 2. Table 5 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2. Table 6 shows the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens, the total optical length TTL of the image pickup lens, and half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 in example 2. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Flour mark Surface type Radius of curvature Thickness of Material Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface Go to nothing -0.4542
S1 Aspherical surface 1.8425 0.6592 1.55,56.1 0.7020
S2 Aspherical surface 3.8868 0.0615 -9.3631
S3 Aspherical surface 2.6652 0.2400 1.73,28.8 -29.8045
S4 Aspherical surface 2.4973 0.3376 2.4824
S5 Aspherical surface 13.6954 0.4452 1.55,56.1 84.5937
S6 Aspherical surface -10.6887 0.1922 1.6538
S7 Aspherical surface -1.7970 0.2400 1.74,28.2 1.0657
S8 Aspherical surface -2.8549 0.0200 2.0521
S9 Aspherical surface 2.9269 0.3587 1.70,48.1 1.7826
S10 Aspherical surface 3.7705 0.3352 2.0694
S11 Aspherical surface 15.5356 0.5114 1.59,55.3 -9.6073
S12 Aspherical surface -1.6482 0.3216 -7.7528
S13 Aspherical surface -49.1743 0.3200 1.54,55.8 99.0000
S14 Aspherical surface 1.2172 0.8438 -6.7763
S15 Spherical surface All-round 0.2100 1.52,64.2
S16 Spherical surface All-round 0.0536
S17 Spherical surface All-round 0
TABLE 4
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -1.9098E-02 2.4496E-02 -7.5638E-02 9.2931E-02 -7.0500E-02 2.7660E-02 -5.4164E-03 0
S2 -1.0938E-01 4.1319E-02 7.3160E-02 -1.3944E-01 1.0001E-01 -3.5512E-02 5.0726E-03 0
S3 3.5919E-02 -2.9450E-01 6.1164E-01 -6.7966E-01 4.4764E-01 -1.5826E-01 2.3811E-02 0
S4 -7.4012E-02 -7.0898E-02 2.5417E-01 -4.0903E-01 4.1704E-01 -2.4472E-01 6.6129E-02 0
S5 -4.7586E-02 3.5993E-02 -2.3525E-01 4.6104E-01 -5.5206E-01 3.4829E-01 -9.1523E-02 0
S6 -7.4567E-02 -7.0245E-02 1.1458E-01 -2.7722E-01 2.9055E-01 -1.2886E-01 1.8686E-02 0
S7 1.1963E-01 -3.0632E-01 5.9791E-01 -9.1525E-01 9.2176E-01 -4.9155E-01 1.1072E-01 0
S8 2.7976E-02 -2.9331E-02 8.2704E-02 -1.7885E-01 1.8732E-01 -9.3159E-02 1.8586E-02 0
S9 -1.9925E-01 2.1327E-01 -2.0825E-01 1.3637E-01 -6.7285E-02 2.0025E-02 -2.4331E-03 0
S10 -1.2107E-01 8.8515E-03 3.9450E-02 -3.6730E-02 1.0316E-02 -1.2342E-04 -2.0794E-04 0
S11 8.9983E-02 -5.4797E-02 -1.7392E-02 3.6200E-02 -2.7230E-02 8.6006E-03 -9.3293E-04 0
S12 8.8409E-02 3.0816E-04 -1.0087E-02 -1.3105E-02 8.9417E-03 -1.8854E-03 1.3462E-04 0
S13 -1.7347E-01 9.5842E-02 -4.7799E-02 2.0456E-02 -5.4921E-03 8.4579E-04 -6.9049E-05 2.3259E-06
S14 -1.1733E-01 6.6758E-02 -2.8858E-02 8.4404E-03 -1.6035E-03 1.8731E-04 -1.2006E-05 3.1876E-07
TABLE 5
f1(mm) 5.76 f(mm) 3.96
f2(mm) -136.64 TTL(mm) 5.15
f3(mm) 11.07 ImgH(mm) 3.40
f4(mm) -7.21
f5(mm) 15.91
f6(mm) 2.55
f7(mm) -2.21
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 4B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents the distortion magnitude values in the case of different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 2, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 4A to 4D, the imaging lens according to embodiment 2 can achieve good imaging quality.
Example 3
An imaging lens 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 imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 3. Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3. Table 9 shows the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the imaging lens, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 in example 3. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001300773800000151
Figure BDA0001300773800000161
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -1.7623E-02 1.8009E-02 -5.7952E-02 6.7672E-02 -5.0504E-02 1.9677E-02 -4.1854E-03 0
S2 -1.1933E-01 6.6108E-02 3.8538E-02 -1.0680E-01 8.1049E-02 -2.9779E-02 4.4199E-03 0
S3 3.6187E-02 -2.8748E-01 5.9414E-01 -6.6102E-01 4.3582E-01 -1.5445E-01 2.3359E-02 0
S4 -7.5562E-02 -5.6376E-02 2.1198E-01 -3.3878E-01 3.4266E-01 -1.9901E-01 5.4114E-02 0
S5 -4.5818E-02 2.6956E-02 -2.1019E-01 4.2990E-01 -5.3343E-01 3.4583E-01 -9.2427E-02 0
S6 -7.5511E-02 -5.5891E-02 7.0163E-02 -2.0271E-01 2.2038E-01 -9.2845E-02 1.0641E-02 0
S7 1.2126E-01 -3.1526E-01 6.3011E-01 -9.8173E-01 9.9087E-01 -5.2445E-01 1.1614E-01 0
S8 2.8190E-02 -3.6283E-02 1.0001E-01 -1.9355E-01 1.9053E-01 -9.0831E-02 1.7509E-02 0
S9 -1.9623E-01 2.0525E-01 -1.9789E-01 1.3238E-01 -6.7511E-02 2.0539E-02 -2.5392E-03 0
S10 -1.2179E-01 6.8942E-03 3.8296E-02 -3.0984E-02 5.7298E-03 1.3514E-03 -3.7997E-04 0
S11 8.9011E-02 -5.4580E-02 -1.9670E-02 3.9891E-02 -2.9454E-02 9.1829E-03 -9.8868E-04 0
S12 8.6380E-02 1.6721E-03 -1.1490E-02 -1.1601E-02 8.1805E-03 -1.7162E-03 1.2075E-04 0
S13 -1.8056E-01 1.0156E-01 -5.1661E-02 2.2536E-02 -6.1666E-03 9.6722E-04 -8.0352E-05 2.7512E-06
S14 -1.0782E-01 5.7877E-02 -2.4334E-02 6.9631E-03 -1.2864E-03 1.4585E-04 -9.0943E-06 2.3562E-07
TABLE 8
f1(mm) 5.97 f(mm) 3.93
f2(mm) 254.99 TTL(mm) 5.15
f3(mm) 11.17 ImgH(mm) 3.40
f4(mm) -7.13
f5(mm) 15.29
f6(mm) 2.57
f7(mm) -2.20
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 6B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents the distortion magnitude values in the case of different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 6A to 6D, the imaging lens system according to embodiment 3 can achieve good imaging quality.
Example 4
An imaging lens 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 imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the image pickup lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the image pickup lens. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 4. Table 11 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4. Table 12 shows the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens, the total optical length TTL of the image pickup lens, and half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 in example 4. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001300773800000171
Figure BDA0001300773800000181
Watch 10
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -1.6653E-02 1.2344E-02 -4.7591E-02 6.4487E-02 -5.7270E-02 2.6488E-02 -5.7287E-03 0
S2 -1.2924E-01 1.0399E-01 -4.1256E-02 -1.2338E-03 1.4129E-03 1.9494E-03 -7.7376E-04 0
S3 2.6799E-02 -2.4570E-01 5.0960E-01 -5.5020E-01 3.5117E-01 -1.2260E-01 1.8523E-02 0
S4 -7.7138E-02 -3.5169E-02 1.6586E-01 -2.4627E-01 2.2937E-01 -1.2339E-01 3.1176E-02 0
S5 -4.3478E-02 4.5043E-02 -2.5802E-01 5.1734E-01 -6.0079E-01 3.6626E-01 -9.3349E-02 0
S6 -7.5547E-02 1.6037E-03 -9.6445E-02 7.4503E-02 -3.4274E-02 2.4583E-02 -9.9282E-03 0
S7 1.2567E-01 -3.0919E-01 5.9651E-01 -9.1202E-01 9.1014E-01 -4.7544E-01 1.0328E-01 0
S8 2.2825E-02 -3.3515E-02 8.0118E-02 -1.3279E-01 1.2532E-01 -5.8466E-02 1.0998E-02 0
S9 -1.8247E-01 1.7948E-01 -1.5453E-01 9.0631E-02 -4.0382E-02 1.1028E-02 -1.2636E-03 0
S10 -1.1277E-01 8.8118E-03 2.3758E-02 -1.6076E-02 5.6811E-04 1.7365E-03 -3.2185E-04 0
S11 7.2195E-02 -1.9998E-02 -6.3941E-02 7.3837E-02 -4.3582E-02 1.2143E-02 -1.2344E-03 0
S12 7.9259E-02 2.3852E-02 -3.3175E-02 1.5382E-03 3.7902E-03 -9.9115E-04 7.4359E-05 0
S13 -1.7021E-01 9.0451E-02 -4.3979E-02 1.8448E-02 -4.8518E-03 7.3078E-04 -5.8312E-05 1.9187E-06
S14 -8.2052E-02 3.3304E-02 -9.3056E-03 1.3726E-03 -8.1470E-05 -1.1356E-06 3.0811E-07 -8.6766E-09
TABLE 11
f1(mm) 6.11 f(mm) 3.90
f2(mm) 532.41 TTL(mm) 5.17
f3(mm) 10.29 ImgH(mm) 3.40
f4(mm) -7.69
f5(mm) 16.71
f6(mm) 2.98
f7(mm) -2.37
TABLE 12
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 8B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the imaging lens of embodiment 4, which represents the distortion magnitude values in the case of different angles of view. Fig. 8D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 4, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 8A to 8D, the imaging lens system according to embodiment 4 can achieve good imaging quality.
Example 5
An imaging lens 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 imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 5. Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5. Table 15 shows the effective focal lengths f1 to f7 of the respective lenses of example 5,
The total effective focal length f of the imaging lens, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging plane S17. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001300773800000191
Figure BDA0001300773800000201
Watch 13
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -1.0652E-02 1.0198E-02 -2.2334E-02 2.4659E-02 -2.1939E-02 1.3058E-02 -3.5516E-03 0
S2 -5.1029E-02 -7.9011E-02 2.0779E-01 -1.9663E-01 9.6705E-02 -2.3912E-02 2.1931E-03 0
S3 1.5315E-01 -6.0325E-01 9.7368E-01 -9.1901E-01 5.2907E-01 -1.7130E-01 2.3833E-02 0
S4 -4.8367E-02 -1.2887E-01 2.3981E-01 -3.2145E-01 3.6477E-01 -2.5262E-01 7.5342E-02 0
S5 6.2981E-03 -2.7735E-01 8.6795E-01 -1.8523E+00 2.2097E+00 -1.3540E+00 3.3142E-01 0
S6 -6.7177E-02 -1.0001E-01 2.2821E-01 -6.2519E-01 9.3979E-01 -6.7260E-01 1.8008E-01 0
S7 1.4957E-01 -5.6020E-01 1.4917E+00 -2.8141E+00 3.3221E+00 -2.1069E+00 5.4515E-01 0
S8 5.3897E-02 -1.1048E-01 2.4366E-01 -3.5692E-01 3.1737E-01 -1.5573E-01 3.2549E-02 0
S9 -1.9262E-01 2.6138E-01 -2.8501E-01 1.9724E-01 -8.8400E-02 2.1913E-02 -2.1194E-03 0
S10 -1.4625E-01 7.3056E-02 -4.7001E-02 2.8782E-02 -1.5677E-02 5.2130E-03 -6.7653E-04 0
S11 7.7160E-02 -7.3692E-02 3.8499E-02 -1.4838E-02 -2.3342E-04 1.2786E-03 -1.7913E-04 0
S12 5.6503E-02 -6.7134E-03 7.7088E-03 -1.6277E-02 7.4144E-03 -1.3440E-03 8.7880E-05 0
S13 -1.8398E-01 2.1180E-02 5.1401E-02 -4.5833E-02 2.0724E-02 -5.2365E-03 6.9071E-04 -3.7095E-05
S14 -1.1671E-01 5.4346E-02 -1.7156E-02 3.2875E-03 -3.7885E-04 2.5953E-05 -9.7479E-07 1.5418E-08
TABLE 14
f1(mm) 7.07 f(mm) 3.65
f2(mm) 50.43 TTL(mm) 5.05
f3(mm) 9.46 ImgH(mm) 3.40
f4(mm) -7.23
f5(mm) 19.52
f6(mm) 2.41
f7(mm) -2.31
Watch 15
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 10B shows astigmatism curves representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents the distortion magnitude values in the case of different angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 10A to 10D, the imaging lens according to embodiment 5 can achieve good imaging quality.
Example 6
An imaging lens 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 imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object side surface S9 and an image side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 6. Table 17 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6. Table 18 shows the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens, the total optical length TTL of the image pickup lens, and half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 in example 6. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001300773800000211
Figure BDA0001300773800000221
TABLE 16
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -2.1468E-03 2.4652E-03 -5.0332E-03 4.6441E-03 -2.2045E-03 4.7433E-04 -3.6823E-05 0
S2 -2.6146E-02 1.6060E-02 -3.5002E-03 -6.5172E-03 7.3549E-03 -3.4925E-03 6.7741E-04 0
S3 -3.9605E-02 4.6923E-03 2.1117E-02 -2.1204E-02 9.8854E-03 -2.1816E-03 1.8138E-04 0
S4 -5.0893E-02 1.3873E-02 -5.1234E-03 1.7502E-02 -2.4195E-02 1.4811E-02 -3.4711E-03 0
S5 4.6564E-02 -5.9557E-02 2.8160E-02 -5.9704E-03 -6.9994E-03 5.6560E-03 -1.1033E-03 0
S6 -2.0454E-02 -1.5549E-02 7.7660E-03 -1.7362E-02 1.7884E-02 -9.3547E-03 2.1382E-03 0
S7 1.1862E-02 -6.4065E-02 5.4314E-02 -1.7860E-02 2.6426E-03 -1.6118E-04 2.2518E-06 0
S8 1.1586E-02 -5.9080E-02 5.4531E-02 -2.1864E-02 4.3413E-03 -3.7664E-04 7.2855E-06 0
S9 -3.1906E-02 1.0838E-02 -1.0692E-02 7.6789E-03 -3.9950E-03 1.1105E-03 -1.2082E-04 0
S10 -6.4255E-02 2.9066E-02 -1.8224E-02 6.9200E-03 -1.5970E-03 1.5823E-04 5.9523E-07 0
S11 1.1077E-03 -1.4181E-02 5.5679E-03 -2.2729E-03 6.0067E-04 -7.8575E-05 3.9053E-06 0
S12 5.2436E-03 -1.0529E-02 1.9043E-03 -3.7688E-04 8.0983E-05 -8.5462E-06 3.1960E-07 0
S13 -7.9257E-02 3.1505E-02 -8.2890E-03 1.3425E-03 -1.1908E-04 5.7281E-06 -1.4100E-07 1.3941E-09
S14 -1.9633E-02 4.0745E-03 -4.3001E-04 1.7804E-05 -3.8427E-07 4.5497E-09 -2.7951E-11 6.9692E-14
TABLE 17
f1(mm) 4.53 f(mm) 4.38
f2(mm) -6.79 TTL(mm) 5.97
f3(mm) 9.05 ImgH(mm) 3.24
f4(mm) -7.93
f5(mm) 8.77
f6(mm) 5.56
f7(mm) -2.99
Watch 18
Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values in the case of different angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 12A to 12D, the imaging lens according to embodiment 6 can achieve good imaging quality.
Example 7
An imaging lens 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 imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 7. Table 20 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7. Table 21 shows effective focal lengths f1 to f7 of the respective lenses, a total effective focal length f of the image pickup lens, an optical total length TTL of the image pickup lens, and a half ImgH of a diagonal length of an effective pixel area on the imaging surface S17 in example 7. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001300773800000231
Figure BDA0001300773800000241
Watch 19
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -6.2128E-03 2.3447E-03 -1.0462E-02 1.2622E-02 -9.8136E-03 4.0115E-03 -7.6001E-04 0
S2 -1.5331E-02 -1.2441E-02 3.7026E-02 -3.9063E-02 2.2549E-02 -7.3433E-03 1.0511E-03 0
S3 -2.6574E-02 -3.0335E-02 6.7133E-02 -5.4981E-02 2.4111E-02 -5.3036E-03 4.5379E-04 0
S4 -4.4662E-02 -1.3964E-02 2.9057E-02 -1.3579E-02 -5.7875E-03 8.3672E-03 -2.5156E-03 0
S5 3.4205E-02 -4.0376E-02 2.0671E-03 2.0501E-02 -2.3755E-02 1.2211E-02 -2.2302E-03 0
S6 -2.6385E-02 -1.4164E-02 1.7244E-02 -3.5204E-02 3.4914E-02 -1.6930E-02 3.3973E-03 0
S7 3.7440E-02 -5.5057E-02 4.4554E-02 -1.7800E-02 3.5789E-03 -3.5116E-04 1.3441E-05 0
S8 1.1675E-02 -6.4514E-03 -5.1513E-03 1.4573E-02 -1.0912E-02 3.6570E-03 -4.5966E-04 0
S9 -4.6780E-02 4.3273E-02 -4.8787E-02 3.3877E-02 -1.5265E-02 3.8058E-03 -3.8225E-04 0
S10 -5.9977E-02 1.6432E-02 -6.1383E-03 -4.0595E-04 1.1836E-03 -4.6417E-04 6.0206E-05 0
S11 -1.4570E-02 -4.7167E-03 1.6096E-03 -8.8451E-04 2.8038E-04 -3.8429E-05 1.8841E-06 0
S12 7.0193E-03 -9.6023E-03 1.4221E-03 -9.2661E-05 3.0610E-06 -5.0110E-08 3.2369E-10 0
S13 -1.4637E-02 3.6981E-03 -1.6280E-04 3.4450E-06 -4.0365E-08 2.6770E-10 -9.4225E-13 1.3719E-15
S14 -1.1989E-02 2.3946E-03 -2.7315E-04 1.3150E-05 -3.4167E-07 4.8560E-09 -3.5317E-11 1.0285E-13
Watch 20
f1(mm) 4.51 f(mm) 4.35
f2(mm) -6.95 TTL(mm) 5.96
f3(mm) 8.91 ImgH(mm) 3.24
f4(mm) -7.13
f5(mm) 7.71
f6(mm) 5.18
f7(mm) -2.66
TABLE 21
Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the optical system. Fig. 14B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the imaging lens of embodiment 7, which represents the distortion magnitude values in the case of different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 14A to 14D, the imaging lens according to embodiment 7 can achieve good imaging quality.
Example 8
An imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application.
As shown in fig. 15, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object-side surface S3 and an image-side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 8. Table 23 shows high-order term coefficients that can be used for each aspherical mirror surface in example 8. Table 24 shows effective focal lengths f1 to f7 of the respective lenses, a total effective focal length f of the image pickup lens, an optical total length TTL of the image pickup lens, and half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 in example 8. Wherein each aspherical surface type can be defined by formula (1) given in embodiment 1 above.
Figure BDA0001300773800000251
Figure BDA0001300773800000261
TABLE 22
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -2.3126E-03 -5.1977E-04 4.3916E-05 -1.6063E-06 3.0843E-08 -3.0568E-10 1.2444E-12 0
S2 -2.9031E-02 2.4554E-02 -2.0567E-02 1.3827E-02 -5.9193E-03 1.3043E-03 -1.0597E-04 0
S3 -1.2756E-02 9.3623E-03 -2.5330E-03 3.2303E-04 -2.1635E-05 7.3989E-07 -1.0221E-08 0
S4 -5.2081E-02 2.7747E-02 -1.4778E-02 8.0879E-03 -6.6750E-03 3.7078E-03 -6.8269E-04 0
S5 5.5959E-02 -1.1320E-01 9.4940E-02 -4.4116E-02 -6.1996E-03 1.4619E-02 -3.6777E-03 0
S6 2.2592E-02 -9.4658E-02 5.5262E-02 3.3757E-03 -4.9332E-02 4.0525E-02 -1.0046E-02 0
S7 3.0749E-02 -2.1834E-02 -1.1127E-02 4.6129E-02 -5.5149E-02 3.3655E-02 -7.9882E-03 0
S8 5.4824E-03 -1.0371E-04 1.2910E-06 -6.3935E-09 -6.7405E-12 1.3836E-13 -1.1945E-15 0
S9 1.0127E-02 -1.0063E-01 1.1516E-01 -1.0156E-01 5.1906E-02 -1.4893E-02 1.8606E-03 0
S10 -7.5270E-02 2.2593E-02 -5.7682E-03 -5.9142E-03 5.3822E-03 -1.9409E-03 2.6487E-04 0
S11 -2.7485E-02 2.1681E-03 3.1594E-03 -1.1732E-03 1.5526E-04 -1.0208E-05 2.9010E-07 0
S12 -8.9273E-03 -4.5286E-03 4.7712E-04 4.2731E-04 -1.3697E-04 1.5164E-05 -5.7492E-07 0
S13 -9.1032E-02 2.6719E-02 -5.9188E-03 1.0543E-03 -1.1403E-04 6.6929E-06 -1.9735E-07 2.2965E-09
S14 -1.1737E-02 2.9206E-04 7.0646E-05 -3.2485E-06 6.2545E-08 -6.2197E-10 3.1446E-12 -6.4096E-15
TABLE 23
f1(mm) 4.74 f(mm) 4.41
f2(mm) -7.74 TTL(mm) 5.97
f3(mm) 14.10 ImgH(mm) 3.24
f4(mm) -36.41
f5(mm) 14.24
f6(mm) 7.37
f7(mm) -3.38
Watch 24
Fig. 16A shows an on-axis chromatic aberration curve of an imaging lens of embodiment 8, which represents a convergent focus deviation of light rays of different wavelengths after passing through an optical system. Fig. 16B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 8. Fig. 16C shows a distortion curve of the imaging lens of embodiment 8, which represents the distortion magnitude values in the case of different angles of view. Fig. 16D shows a chromatic aberration of magnification curve of the imaging lens of embodiment 8, which represents a deviation of different image heights on the imaging plane after light passes through the imaging lens. As can be seen from fig. 16A to 16D, the imaging lens according to embodiment 8 can achieve good imaging quality.
Example 9
An imaging lens according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic configuration diagram of an imaging lens according to embodiment 9 of the present application.
As shown in fig. 17, the imaging lens includes seven lenses E1-E7 arranged in order from the object side to the image side along the optical axis. The first lens E1 has an object-side surface S1 and an image-side surface S2; the second lens E2 has an object side surface S3 and an image side surface S4; the third lens E3 has an object-side surface S5 and an image-side surface S6; the fourth lens E4 has an object-side surface S7 and an image-side surface S8; the fifth lens E5 has an object-side surface S9 and an image-side surface S10; the sixth lens E6 has an object-side surface S11 and an image-side surface S12; and the seventh lens E7 has an object-side surface S13 and an image-side surface S14. Optionally, the imaging lens may further include a filter E8 having an object side surface S15 and an image side surface S16. In the imaging lens of the present embodiment, a stop STO for limiting a light beam may be further provided to improve the imaging quality of the imaging lens. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.
Table 25 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 9. Table 26 shows high-order term coefficients that can be used for each aspherical mirror surface in example 9. Table 27 shows the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the imaging lens, the total optical length TTL of the imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging plane S17 in example 9. Wherein each aspherical surface type can be defined by the formula (1) given in the above-described embodiment 1.
Figure BDA0001300773800000271
Figure BDA0001300773800000281
TABLE 25
Flour mark A4 A6 A8 A10 A12 A14 A16 A18
S1 -1.5025E-02 2.8315E-02 -9.7482E-02 1.5063E-01 -1.3397E-01 6.2078E-02 -1.2237E-02 0
S2 -8.2352E-02 -3.3533E-02 2.2928E-01 -3.3732E-01 2.5770E-01 -1.0499E-01 1.7721E-02 0
S3 3.8510E-02 -3.2740E-01 7.1402E-01 -8.5837E-01 6.2393E-01 -2.5461E-01 4.4861E-02 0
S4 -6.5506E-02 -7.1648E-02 2.2714E-01 -3.0010E-01 2.3908E-01 -1.0479E-01 1.9774E-02 0
S5 -2.9320E-02 4.7383E-02 -3.2735E-01 7.4385E-01 -9.4121E-01 6.2140E-01 -1.7081E-01 0
S6 -6.5453E-02 -5.7569E-02 4.4032E-02 -1.4677E-01 1.9360E-01 -1.0214E-01 1.7862E-02 0
S7 1.2357E-01 -3.2777E-01 6.0275E-01 -8.6993E-01 8.4053E-01 -4.3553E-01 9.4546E-02 0
S8 2.1733E-02 -1.6776E-02 3.8114E-02 -4.9308E-02 3.6876E-02 -1.4978E-02 2.8399E-03 0
S9 -1.7520E-01 1.9799E-01 -1.9505E-01 1.3399E-01 -6.3933E-02 1.7450E-02 -1.9531E-03 0
S10 -1.2295E-01 5.0415E-02 -3.7178E-02 3.1372E-02 -1.8655E-02 5.5553E-03 -6.1295E-04 0
S11 5.8603E-02 -1.6145E-02 -3.2633E-02 3.3241E-02 -1.7900E-02 4.5432E-03 -4.1641E-04 0
S12 4.1746E-02 3.8582E-02 -3.5549E-02 7.0528E-03 3.0020E-04 -2.1930E-04 1.6890E-05 0
S13 -1.8793E-01 9.9813E-02 -4.8346E-02 2.0399E-02 -5.2398E-03 7.3391E-04 -5.0346E-05 1.2132E-06
S14 -9.2473E-02 4.2748E-02 -1.4479E-02 3.1889E-03 -4.3293E-04 3.5500E-05 -1.6260E-06 3.1866E-08
Watch 26
f1(mm) 5.31 f(mm) 3.98
f2(mm) -17.47 TTL(mm) 5.41
f3(mm) 9.10 ImgH(mm) 3.24
f4(mm) -7.52
f5(mm) 14.23
f6(mm) 3.05
f7(mm) -2.45
Watch 27
In summary, examples 1 to 9 each satisfy the relationship shown in table 28 below.
Conditions/examples 1 2 3 4 5 6 7 8 9
f/EPD 1.55 1.55 1.55 1.53 1.55 1.55 1.55 1.55 1.55
f/f1 0.69 0.69 0.66 0.64 0.52 0.97 0.96 0.93 0.75
f/f5 0.22 0.25 0.26 0.23 0.19 0.50 0.56 0.31 0.28
f/f7 -1.80 -1.79 -1.78 -1.64 -1.58 -1.46 -1.64 -1.30 -1.63
f1/f3 0.51 0.52 0.53 0.59 0.75 0.50 0.51 0.34 0.58
f1/f4 -0.72 -0.80 -0.84 -0.80 -0.98 -0.57 -0.63 -0.13 -0.71
f6/f7 -1.21 -1.15 -1.17 -1.25 -1.04 -1.86 -1.95 -2.18 -1.25
CT5/CT6 0.69 0.70 0.73 0.83 0.93 0.97 0.87 0.64 0.83
T23/CT3 0.73 0.76 0.77 0.66 0.59 0.38 0.37 0.53 0.53
R3/R8 -0.92 -0.93 -0.91 -0.95 -0.86 -1.30 -1.36 -1.39 -1.15
R4/R7 -1.38 -1.39 -1.40 -1.41 -1.42 -1.05 -1.14 -0.83 -1.39
|(R7-R8)/(R7+R8)| 0.23 0.23 0.23 0.21 0.23 0.33 0.35 0.08 0.22
TTL/ImgH 1.47 1.51 1.52 1.52 1.49 1.84 1.84 1.85 1.67
Watch 28
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 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 (14)

1. An imaging lens having a total effective focal length f and an entrance pupil diameter EPD, the imaging lens including, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, and a number of lenses having a refractive power in the imaging lens being seven,
it is characterized in that the preparation method is characterized in that,
the first lens, the third lens, the fifth lens and the sixth lens each have a positive optical power;
the second lens has positive focal power or negative focal power;
the seventh lens has a negative optical power;
the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the object side surface of the first lens is a convex surface; and
the total effective focal length f and the entrance pupil diameter EPD satisfy f/EPD is less than or equal to 1.7.
2. The imaging lens of claim 1, wherein a distance TTL between an object side surface of the first lens element and an imaging surface of the imaging lens 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 satisfy TTL/ImgH ≦ 1.85.
3. The imaging lens according to claim 2,
the image side surface of the first lens is a concave surface;
the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; and
the object side surface and the image side surface of the sixth lens are convex at the paraxial position.
4. The imaging lens according to any one of claims 1 to 3, wherein the total effective focal length f and the effective focal length f1 of the first lens satisfy 0.5 ≦ f/f1 ≦ 1.0.
5. The imaging lens according to any one of claims 1 to 3, wherein the total effective focal length f and an effective focal length f5 of the fifth lens satisfy 0 < f/f5 < 1.0.
6. The imaging lens according to any one of claims 1 to 3, wherein the total effective focal length f and an effective focal length f7 of the seventh lens satisfy-2 < f/f7 < 0.
7. The imaging lens according to any one of claims 1 to 3, characterized in that an effective focal length f1 of the first lens and an effective focal length f3 of the third lens satisfy 0 < f1/f3 < 1.0.
8. The imaging lens according to any one of claims 1 to 3, characterized in that an effective focal length f1 of the first lens and an effective focal length f4 of the fourth lens satisfy-1.0 ≦ f1/f4 < 0.
9. An image-capturing lens system according to any one of claims 1 to 3, characterized in that the effective focal length f6 of the sixth lens and the effective focal length f7 of the seventh lens satisfy-2.5 < f6/f7 ≦ -1.0.
10. The imaging lens according to any one of claims 1 to 3, wherein a central thickness CT5 of the fifth lens and a central thickness CT6 of the sixth lens satisfy 0.5 < CT5/CT6 ≦ 1.0.
11. The imaging lens according to any one of claims 1 to 3, wherein an air interval T23 of the second lens and the third lens on the optical axis and a center thickness CT3 of the third lens satisfy 0 < T23/CT3 < 1.0.
12. The imaging lens according to any one of claims 1 to 3, wherein a radius of curvature R3 of an object-side surface of the second lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy-1.5 < R3/R8 < 0.
13. The imaging lens according to any one of claims 1 to 3, wherein a radius of curvature R4 of an image-side surface of the second lens and a radius of curvature R7 of an object-side surface of the fourth lens satisfy-1.5 < R4/R7 < -0.5.
14. The imaging lens according to any one of claims 1 to 3, wherein a radius of curvature R7 of an object-side surface of the fourth lens and a radius of curvature R8 of an image-side surface of the fourth lens satisfy | (R7-R8)/(R7+ R8) | < 1.0.
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