CN114114635B - Image pickup lens group - Google Patents
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- CN114114635B CN114114635B CN202111517054.1A CN202111517054A CN114114635B CN 114114635 B CN114114635 B CN 114114635B CN 202111517054 A CN202111517054 A CN 202111517054A CN 114114635 B CN114114635 B CN 114114635B
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- 238000003384 imaging method Methods 0.000 claims abstract description 221
- 230000003287 optical effect Effects 0.000 claims abstract description 57
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- 230000014509 gene expression Effects 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
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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
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The application discloses an imaging lens group, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having optical power; 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; a diaphragm; a third lens having positive optical power, the object side surface of which is a convex surface; a fourth lens with negative focal power, the object side surface of which is a concave surface; a fifth lens having positive optical power, an image side surface of which is convex; a sixth lens element with optical power, wherein an object-side surface of the sixth lens element is convex, an image-side surface of the sixth lens element is concave, and at least one of the object-side surface and the image-side surface of the sixth lens element has an inflection point; and a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the seventh lens element has an inflection point. The maximum effective radius DT61 of the object side surface of the sixth lens and the maximum effective radius DT62 of the image side surface of the sixth lens satisfy: -20.00 < (dt61+dt62)/(DT 61-DT 62) < -7.00.
Description
Filing and applying for separate cases
The application relates to a divisional application of a Chinese application patent application with the name of 'image pickup lens group' and the application number of 201910769147.X, which is submitted in 8 months and 20 days of 2019.
Technical Field
The present application relates to an imaging lens group, and more particularly, to an imaging lens group including seven lenses.
Background
At present, the ultra-thin mobile phone is a market trend, and the module technology is continuously updated, wherein the imaging quality of the mobile phone lens is also required to be higher and higher. Along with the trend of the mobile phone towards light and thin, the camera lens set matched with the mobile phone has good image quality and needs to have light and thin characteristics, so that the thickness of the mobile phone can be effectively reduced. How to ensure the size reduction and improve the imaging quality based on the traditional structure is a big difficulty facing the recent design of the mobile phone lens.
Disclosure of Invention
An aspect of the present application provides an imaging lens group including, in order from an object side to an image side along an optical axis: a first lens having optical power; 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; a diaphragm; a third lens having positive optical power, the object side surface of which is a convex surface; a fourth lens with negative focal power, the object side surface of which is a concave surface; a fifth lens having positive optical power, an image side surface of which is convex; a sixth lens element with optical power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the sixth lens element has an inflection point; and a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the seventh lens element has an inflection point. The maximum effective radius DT61 of the object side surface of the sixth lens and the maximum effective radius DT62 of the image side surface of the sixth lens may satisfy: -20.00 < (dt61+dt62)/(DT 61-DT 62) < -7.00.
In one embodiment, the distance TTL between the object side surface of the first lens element and the imaging surface of the imaging lens group on the optical axis, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the imaging lens group, and the total effective focal length f of the imaging lens group may satisfy: 3.00mm < TTL/ImgH×f < 6.00mm.
In one embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the imaging lens group may satisfy: 1.00 < f5/f < 3.00.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens may satisfy: R11/R12 is more than 0.50 and less than 1.50.
In one embodiment, the effective focal length f7 of the seventh lens and the curvature radius R10 of the image side surface of the fifth lens may satisfy: 2.50 < f7/R10 < 5.50.
In one embodiment, the center thickness CT2 of the third lens on the optical axis and the separation distance T23 of the second lens and the third lens on the optical axis may satisfy: CT2/T23 is more than 1.00 and less than 3.00.
In one embodiment, the total effective focal length f of the imaging lens group and the radius of curvature R3 of the object side surface of the second lens may satisfy: 0.50 < f/R3 < 2.00.
In one embodiment, the sum Σat of the distance TD between the object side surface of the first lens element and the image side surface of the seventh lens element on the optical axis and the distance between any two adjacent lens elements of the first lens element and the seventh lens element on the optical axis may satisfy: ΣAT/TD < 0.42.
In one embodiment, the distance SAG21 on the optical axis from the intersection point of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens and the distance SAG22 on the optical axis from the intersection point of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens may satisfy: 1.00 < (SAG21+SAG22)/(SAG 21-SAG 22) < 2.00.
In one embodiment, the effective focal length f7 of the seventh lens and the effective focal length f4 of the fourth lens may satisfy: 0.50 < f7/f4 < 3.50.
The application adopts seven lenses, and the optical imaging lens has at least one beneficial effect of ultra-thinning, high imaging quality, large aperture and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing among the lenses and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic configuration diagram of an imaging lens group according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 1;
fig. 3 is a schematic diagram showing the structure of an imaging lens group according to embodiment 2 of the present application;
Fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 2;
fig. 5 shows a schematic configuration diagram of an imaging lens group according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens group of embodiment 3;
fig. 7 shows a schematic configuration diagram of an imaging lens group 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 group of embodiment 4;
fig. 9 shows a schematic configuration diagram of an imaging lens group 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 group of embodiment 5;
fig. 11 is a schematic diagram showing the structure of an imaging lens group 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 group of embodiment 6.
Detailed Description
For a better understanding of the application, various aspects of the 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 application and is not intended to limit the scope of the 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the 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, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The imaging lens group according to the exemplary embodiment of the present application may include, for example, seven lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, respectively. The seven lenses are arranged in order from the object side to the image side along the optical axis. Any two adjacent lenses among the first lens to the seventh lens can have a spacing distance therebetween.
In an exemplary embodiment, the first lens has optical power; the second lens has optical power, the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the third lens may have positive optical power, and an object side surface thereof may be convex; the fourth lens can have negative focal power, and the object side surface of the fourth lens can be concave; the fifth lens element may have positive refractive power, and an image-side surface thereof may be convex; the sixth lens element with optical power has a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface of the sixth lens element has an inflection point; and the seventh lens element may have negative optical power, the object-side surface thereof may be convex, the image-side surface thereof may be concave, and at least one of the object-side surface and the image-side surface of the seventh lens element has an inflection point.
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, so that the light rays have a better converging effect while the image pickup lens group FNO is reduced. The third lens has positive focal power, the fourth lens has negative focal power and the fifth lens has positive focal power, so that the focal power of the imaging lens group is reasonably distributed, and the focal power is prevented from being excessively concentrated on one or two lenses. The object side surface of the third lens element is convex, the object side surface of the fourth lens element is concave, and the image side surface of the fifth lens element is convex, so that the system Fno is reduced, and meanwhile, marginal rays can be converged on the imaging surface well, which is beneficial to increasing the imaging area of the imaging lens assembly. The convex-concave type of the sixth lens and the convex-concave type of the seventh lens contribute to improvement of spherical aberration of the imaging lens group, so that the imaging lens group has a good aberration correction capability. At least one of the object side surface and the image side surface of each of the last two lenses is guaranteed to have a reverse curvature point, so that coma aberration of the imaging lens can be corrected, and the imaging lens group has good imaging quality.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 3.00mm < TTL/ImgH×f < 6.00mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the imaging lens group on the optical axis, imgH is half of the diagonal length of the effective pixel area on the imaging surface of the imaging lens group, and f is the total effective focal length of the imaging lens group. More specifically, TTL, imgH, and f can further satisfy: 3.50mm < TTL/ImgH×f < 5.50mm. The lens meets the requirements of 3.00mm < TTL/ImgH x f < 6.00mm, not only can help to control the angle of view of the imaging lens group within a reasonable range, but also can help to enlarge the aperture of the imaging lens group, thereby enhancing the imaging quality of the imaging lens group in a dim environment.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 1.00 < f5/f < 3.00, wherein f5 is the effective focal length of the fifth lens, and f is the total effective focal length of the imaging lens group. More specifically, f5 and f further satisfy: 1.20 < f5/f < 2.90. The focal power of the fifth lens can be reasonably controlled by satisfying the requirement that f5/f is smaller than 1.00 and smaller than 3.00, so that the focal power is not only effectively prevented from being excessively concentrated on the fifth lens, but also the sensitivity of the fifth lens is effectively reduced, and the fifth lens has better processing feasibility.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 0.50 < R11/R12 < 1.50, wherein R11 is the radius of curvature of the object-side surface of the sixth lens, and R12 is the radius of curvature of the image-side surface of the sixth lens. More specifically, R11 and R12 may further satisfy: R11/R12 is more than 0.70 and less than 1.20. The curvature radius of the object side surface and the image side surface of the sixth lens is controlled in a reasonable range, so that excessive bending of the center area of the lens can be effectively avoided, the processing feasibility of the sixth lens is improved, and meanwhile, the correction of spherical aberration of the imaging lens group is facilitated.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 2.50 < f7/R10 < 5.50, where f7 is the effective focal length of the seventh lens and R10 is the radius of curvature of the image-side surface of the fifth lens. More specifically, f7 and R10 further satisfy: 2.55 < f7/R10 < 5.50. The ratio of the effective focal length of the seventh lens to the curvature radius of the image side surface of the fifth lens is controlled in a reasonable range, so that the risk of generating ghost images between the seventh lens and the fifth lens can be effectively reduced, the imaging lens group can be miniaturized, and meanwhile, the imaging lens group has good manufacturability and is convenient for post-processing and mass production.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 1.00 < CT2/T23 < 3.00, wherein CT2 is the center thickness of the second lens on the optical axis, and T23 is the distance between the second lens and the third lens on the optical axis. More specifically, CT2 and T23 may further satisfy: CT2/T23 is more than 1.05 and less than 2.80. The ratio of the center thickness of the third lens on the optical axis to the interval distance between the second lens and the third lens on the optical axis is controlled in a reasonable range, so that the size of the imaging lens group can be reduced, and the distortion of the imaging lens group can be improved better.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 0.50 < f/R3 < 2.00, wherein f is the total effective focal length of the imaging lens group, and R3 is the curvature radius of the object side surface of the second lens. More specifically, f and R3 may further satisfy: 0.80 < f/R3 < 2.00. The proportion of the total effective focal length of the imaging lens group and the curvature radius of the object side surface of the second lens is reasonably controlled, so that the size of the imaging lens group can be controlled while the imaging lens group has higher aberration correction capability, and excessive concentration of focal power of the imaging lens group can be avoided. By the mutual matching of the lenses, the aberration of the imaging lens group can be better corrected.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: Σat/TD < 0.42, where TD is the distance between the object side surface of the first lens element and the image side surface of the seventh lens element on the optical axis, and Σat is the sum of the distances between any two adjacent lens elements of the first lens element and the seventh lens element on the optical axis. The spacing distance of each lens on the optical axis is reasonably distributed, so that the processing and assembling characteristics of the camera lens group can be guaranteed, meanwhile, the light deflection is slowed down, the field curvature of the camera lens group is adjusted, the sensitivity is reduced, and better imaging quality is further obtained.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 1.00 < (SAG21+SAG22)/(SAG 21-SAG 22) < 2.00, wherein SAG21 is the distance on the optical axis between the intersection point of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens, and SAG22 is the distance on the optical axis between the intersection point of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens. The sagittal height of the object side surface and the imaging surface of the second lens are reasonably distributed, so that the fifth lens can be prevented from being excessively bent to reduce the processing difficulty, and the spherical aberration of the shooting lens group is reduced.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: -20.00 < (dt61+dt62)/(DT 61-DT 62) < -7.00, wherein DT61 is the maximum effective radius of the object side of the sixth lens and DT62 is the maximum effective radius of the image side of the sixth lens. More specifically, DT61 and DT62 may further satisfy: -17.00 < (dt61+dt62)/(DT 61-DT 62) < -7.50. The maximum effective radius of the object side surface of the sixth lens and the maximum effective radius of the image side surface of the sixth lens are controlled in a reasonable range, and the overlarge difference of the effective radii of the object side surface and the image side surface of the sixth lens can be effectively prevented, so that the processing and forming of the lens are facilitated, and the stability of the performance of the camera lens group is improved.
In an exemplary embodiment, an imaging lens group according to the present application can satisfy: 0.50 < f7/f4 < 3.50, wherein f7 is the effective focal length of the seventh lens and f4 is the effective focal length of the fourth lens. More specifically, f7 and f4 may further satisfy: 0.70 < f7/f4 < 3.20. The ratio of the effective focal length of the seventh lens to the effective focal length of the fourth lens of the imaging lens group is controlled in a reasonable range, so that the risk of generating ghost images between the seventh lens and the fourth lens can be effectively reduced, the focal power of the imaging lens group can be reasonably distributed, and the post-processing mass production is facilitated.
In an exemplary embodiment, the above-described imaging lens group may further include a diaphragm. The diaphragm may be provided at an appropriate position as required, for example, between the second lens and the third lens. Optionally, the above-mentioned imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
The imaging lens group according to the above embodiment of the present application may employ a plurality of lenses, for example, seven lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the imaging lens group can be effectively reduced, the sensitivity of the imaging lens group can be reduced, and the processability of the imaging lens group can be improved, so that the imaging lens group is more beneficial to production and processing and is applicable to portable electronic products. The application provides a seven-piece type imaging lens group with high pixels, large aperture and ultra-thin structure. The camera lens group can provide an ultra-large aperture so as to have better imaging quality even in a dim environment. Meanwhile, due to the unique lens model design of the camera lens group, enough space can be provided for subsequent relevant adjustment, so that relevant structures and assembly processes are more flexible and imaging quality is not reduced excessively.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror. The aspherical 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 a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are aspherical mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the technical solution claimed in the present application. For example, although seven lenses are described as an example in the embodiment, the imaging lens group is not limited to include seven lenses. The imaging lens group may further include other numbers of lenses, if necessary.
Specific examples of the imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An imaging lens group 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 group according to embodiment 1 of the present application.
As shown in fig. 1, the imaging lens assembly sequentially includes, from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 1 shows a basic parameter table of an imaging lens group of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In this example, the total effective focal length f of the imaging lens group is 3.04mm, the total length TTL of the imaging lens group (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens group) is 4.75mm, the half of the diagonal length ImgH of the effective pixel area on the imaging surface S17 of the imaging lens group is 3.43mm, the maximum half field angle Semi-FOV of the imaging lens group is 47.4 °, and the aperture value Fno is 1.60.
In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A 4、A6、A8、A10、A12、A14、A16、A18 and A 20 that can be used for each of the aspherical mirrors S1-S14 in example 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 1.1011E-01 | -9.0413E-02 | 1.6740E-01 | -2.4827E-01 | 2.6765E-01 | -2.0121E-01 | 9.7562E-02 | -2.7282E-02 | 3.3017E-03 |
| S2 | 9.8862E-02 | 6.5830E-02 | -1.4224E-01 | 1.3176E-01 | 1.0917E-01 | -4.1097E-01 | 4.3577E-01 | -2.1536E-01 | 4.1549E-02 |
| S3 | -1.2389E-01 | 2.6856E-01 | -5.5053E-01 | 3.5417E-01 | 1.3389E+00 | -4.0014E+00 | 4.8587E+00 | -2.9001E+00 | 7.0315E-01 |
| S4 | -1.4842E-01 | -9.3411E-02 | 1.2004E+00 | -5.9362E+00 | 1.7339E+01 | -3.1416E+01 | 3.4716E+01 | -2.1414E+01 | 5.6775E+00 |
| S5 | -8.6628E-02 | 3.7091E-03 | -4.7876E-01 | 2.3566E+00 | -7.3472E+00 | 1.3869E+01 | -1.5318E+01 | 9.1000E+00 | -2.2194E+00 |
| S6 | -9.1135E-02 | -1.8698E-01 | 6.8814E-01 | -2.2706E+00 | 4.8295E+00 | -6.5543E+00 | 5.5556E+00 | -2.6946E+00 | 5.7160E-01 |
| S7 | 6.5115E-02 | -3.6458E-01 | 9.0268E-01 | -1.1431E+00 | 7.5944E-01 | 7.9414E-01 | -2.0852E+00 | 1.5169E+00 | -3.7236E-01 |
| S8 | 1.8319E-01 | -1.0602E+00 | 2.1342E+00 | -2.8218E+00 | 2.8885E+00 | -2.1476E+00 | 1.0296E+00 | -2.8245E-01 | 3.4951E-02 |
| S9 | 2.8107E-01 | -7.0856E-01 | 8.6800E-01 | -6.6226E-01 | 2.7250E-01 | -1.6579E-02 | -3.5609E-02 | 1.3771E-02 | -1.5357E-03 |
| S10 | 1.4713E-01 | -4.1472E-02 | -1.9886E-01 | 2.4749E-01 | -1.2534E-01 | 2.0244E-02 | 8.5002E-03 | -4.3404E-03 | 5.5546E-04 |
| S11 | 1.1401E-01 | -3.0929E-01 | 3.5995E-01 | -3.7192E-01 | 2.7020E-01 | -1.2609E-01 | 3.5870E-02 | -5.6277E-03 | 3.7173E-04 |
| S12 | -4.2175E-03 | -3.5334E-03 | -1.2288E-01 | 1.3990E-01 | -7.8010E-02 | 2.5271E-02 | -4.7674E-03 | 4.8254E-04 | -2.0146E-05 |
| S13 | -5.6812E-01 | 1.9896E-01 | -1.5641E-02 | -7.6769E-03 | 2.4366E-03 | -2.7536E-04 | 5.7172E-06 | 1.2920E-06 | -7.8619E-08 |
| S14 | -6.4203E-01 | 4.1967E-01 | -2.1799E-01 | 8.2796E-02 | -2.1251E-02 | 3.5111E-03 | -3.5496E-04 | 1.9900E-05 | -4.7296E-07 |
TABLE 2
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 1, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 2B shows an astigmatism curve of the imaging lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the imaging lens group of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 1, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the imaging lens group provided in embodiment 1 can achieve good imaging quality.
Example 2
An imaging lens group 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 portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an imaging lens group according to embodiment 2 of the present application.
As shown in fig. 3, the imaging lens assembly sequentially includes, from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the imaging lens group is 3.14mm, the total length TTL of the imaging lens group is 4.75mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the imaging lens group is 3.28mm, the maximum half field angle Semi-FOV of the imaging lens group is 45.0 °, and the aperture value Fno is 1.59.
Table 3 shows a basic parameter table of an imaging lens group of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 3 Table 3
TABLE 4 Table 4
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 2, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 4B shows an astigmatism curve of the imaging lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the imaging lens group of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 2, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the imaging lens group provided in embodiment 2 can achieve good imaging quality.
Example 3
An imaging lens group 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 group according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens assembly sequentially includes, from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the imaging lens group is 2.47mm, the total length TTL of the imaging lens group is 4.61mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the imaging lens group is 3.15mm, the maximum half field angle Semi-FOV of the imaging lens group is 47.7 °, and the aperture value Fno is 1.53.
Table 5 shows a basic parameter table of an imaging lens group of embodiment 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 5
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 6.5967E-02 | 1.8043E-01 | -8.4442E-01 | 1.8620E+00 | -2.2756E+00 | 1.6427E+00 | -6.9918E-01 | 1.6230E-01 | -1.5870E-02 |
| S2 | 7.4095E-01 | -2.8668E+00 | 7.7440E+00 | -1.3296E+01 | 1.5374E+01 | -1.2060E+01 | 6.1828E+00 | -1.8651E+00 | 2.4883E-01 |
| S3 | 8.5837E-01 | -4.9466E+00 | 1.6989E+01 | -3.7379E+01 | 5.3986E+01 | -5.0881E+01 | 3.0064E+01 | -1.0087E+01 | 1.4635E+00 |
| S4 | -6.9359E-02 | -1.5598E-01 | 1.3052E-01 | 8.2233E-01 | -2.5827E+00 | 3.2472E+00 | -1.9434E+00 | 4.5984E-01 | 0.0000E+00 |
| S5 | -1.9720E-01 | 1.6959E+00 | -9.8798E+00 | 3.3411E+01 | -7.0197E+01 | 9.2357E+01 | -7.3896E+01 | 3.2838E+01 | -6.2060E+00 |
| S6 | 2.0967E-01 | -2.7532E+00 | 1.4562E+01 | -4.6468E+01 | 9.1951E+01 | -1.1419E+02 | 8.6632E+01 | -3.6701E+01 | 6.6563E+00 |
| S7 | -7.4651E-01 | 4.0677E+00 | -1.7782E+01 | 4.8071E+01 | -8.1061E+01 | 8.6444E+01 | -5.6769E+01 | 2.0949E+01 | -3.3220E+00 |
| S8 | 1.3467E-01 | -1.7469E+00 | 5.1960E+00 | -1.0386E+01 | 1.4505E+01 | -1.3179E+01 | 7.3210E+00 | -2.2625E+00 | 3.0011E-01 |
| S9 | 7.2912E-01 | -2.5314E+00 | 5.3146E+00 | -7.6722E+00 | 7.5878E+00 | -5.0518E+00 | 2.1650E+00 | -5.4086E-01 | 5.9998E-02 |
| S10 | 1.6530E-01 | -4.2029E-01 | 1.0866E+00 | -1.9334E+00 | 2.1006E+00 | -1.4144E+00 | 5.7899E-01 | -1.3140E-01 | 1.2619E-02 |
| S11 | -1.7214E-01 | 2.4130E-01 | -5.9759E-01 | 7.5872E-01 | -5.7976E-01 | 2.7188E-01 | -7.6086E-02 | 1.1654E-02 | -7.5140E-04 |
| S12 | -2.7095E-02 | -1.2719E-01 | 1.1188E-01 | -7.1229E-02 | 2.9810E-02 | -7.1723E-03 | 8.9988E-04 | -4.6823E-05 | 1.8999E-07 |
| S13 | -5.9101E-01 | 3.7137E-01 | -2.1682E-01 | 1.1715E-01 | -4.3534E-02 | 1.0036E-02 | -1.3792E-03 | 1.0391E-04 | -3.3102E-06 |
| S14 | -5.2918E-01 | 3.8324E-01 | -2.2519E-01 | 9.4505E-02 | -2.6378E-02 | 4.7361E-03 | -5.2434E-04 | 3.2534E-05 | -8.6470E-07 |
TABLE 6
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 3, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 6B shows an astigmatism curve of the imaging lens group of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the imaging lens group of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 3, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the imaging lens group provided in embodiment 3 can achieve good imaging quality.
Example 4
An imaging lens group 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 group according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens assembly sequentially includes, from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the imaging lens group is 3.35mm, the total length TTL of the imaging lens group is 5.28mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the imaging lens group is 3.28mm, the maximum half field angle Semi-FOV of the imaging lens group is 41.7 °, and the aperture value Fno is 1.84.
Table 7 shows a basic parameter table of an imaging lens group of embodiment 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 7
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 7.8655E-02 | -3.1978E-02 | 3.2307E-02 | -2.9629E-02 | 1.9703E-02 | -9.2927E-03 | 2.8963E-03 | -5.3486E-04 | 4.4569E-05 |
| S2 | 7.6453E-02 | 7.2146E-03 | -3.9151E-02 | 6.5769E-02 | -6.2281E-02 | 3.4784E-02 | -1.1015E-02 | 1.6680E-03 | -7.4350E-05 |
| S3 | -4.2985E-02 | 9.1848E-02 | -1.9043E-01 | 2.5421E-01 | -1.9127E-01 | 5.2514E-02 | 2.8047E-02 | -2.7269E-02 | 8.4892E-03 |
| S4 | -6.8039E-02 | 5.4501E-02 | -1.2905E-01 | 2.6277E-01 | -3.3602E-01 | 2.5363E-01 | -1.0294E-01 | 1.7416E-02 | 0.0000E+00 |
| S5 | -3.7644E-02 | 1.4703E-02 | -1.0322E-01 | 2.1992E-01 | -2.9227E-01 | 2.3645E-01 | -1.0855E-01 | 2.3952E-02 | -1.3746E-03 |
| S6 | -2.5605E-02 | -9.3509E-02 | 2.8617E-01 | -6.6053E-01 | 9.3727E-01 | -8.2182E-01 | 4.3724E-01 | -1.2995E-01 | 1.6614E-02 |
| S7 | -7.8534E-02 | 8.7755E-02 | -3.1774E-01 | 8.5101E-01 | -1.3318E+00 | 1.3832E+00 | -9.1448E-01 | 3.3757E-01 | -5.2123E-02 |
| S8 | 9.8581E-02 | -5.4173E-01 | 8.3886E-01 | -7.9043E-01 | 5.4917E-01 | -2.7554E-01 | 8.9779E-02 | -1.6751E-02 | 1.4199E-03 |
| S9 | 2.7502E-01 | -6.3027E-01 | 8.0802E-01 | -7.3089E-01 | 4.7264E-01 | -2.1394E-01 | 6.4297E-02 | -1.1558E-02 | 9.4170E-04 |
| S10 | 5.9026E-02 | 2.8549E-02 | -1.0943E-01 | 7.1323E-02 | -7.3663E-03 | -1.2874E-02 | 7.1412E-03 | -1.5439E-03 | 1.2461E-04 |
| S11 | -4.8246E-02 | -3.9084E-02 | 2.3668E-02 | -1.6389E-02 | 8.9740E-03 | -3.0535E-03 | 6.0771E-04 | -6.3507E-05 | 2.6473E-06 |
| S12 | -4.6214E-02 | -6.0988E-03 | -9.0598E-03 | 1.0480E-02 | -5.0206E-03 | 1.3731E-03 | -2.1651E-04 | 1.8150E-05 | -6.2425E-07 |
| S13 | -2.1746E-01 | 6.6678E-02 | -1.5195E-02 | 3.7755E-03 | -7.9443E-04 | 1.0971E-04 | -9.0928E-06 | 4.1253E-07 | -7.9019E-09 |
| S14 | -2.3408E-01 | 1.0925E-01 | -4.1582E-02 | 1.1453E-02 | -2.0953E-03 | 2.4401E-04 | -1.7291E-05 | 6.7817E-07 | -1.1280E-08 |
TABLE 8
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 4, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 8B shows an astigmatism curve of the imaging lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the imaging lens group of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 4, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens group provided in embodiment 4 can achieve good imaging quality.
Example 5
An imaging lens group 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 group according to embodiment 5 of the present application.
As shown in fig. 9, the imaging lens assembly sequentially includes, from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the imaging lens group is 2.95mm, the total length TTL of the imaging lens group is 4.41mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the imaging lens group is 2.85mm, the maximum half field angle Semi-FOV of the imaging lens group is 32.6 °, and the aperture value Fno is 1.52.
Table 9 shows a basic parameter table of an imaging lens group of embodiment 5, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 9
Table 10
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 5, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 10B shows an astigmatism curve of the imaging lens group of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the imaging lens group of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 5, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens group provided in embodiment 5 can achieve good imaging quality.
Example 6
An imaging lens group 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 group according to embodiment 6 of the present application.
As shown in fig. 11, the imaging lens assembly includes, in order from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The filter E8 has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
In this example, the total effective focal length f of the imaging lens group is 3.31mm, the total length TTL of the imaging lens group is 4.94mm, the half of the diagonal length ImgH of the effective pixel region on the imaging surface S17 of the imaging lens group is 3.15mm, the maximum half field angle Semi-FOV of the imaging lens group is 41.1 °, and the aperture value Fno is 1.83.
Table 11 shows a basic parameter table of an imaging lens group of embodiment 6, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 11
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S1 | 9.0996E-02 | -1.4059E-03 | -6.2128E-02 | 1.3908E-01 | -1.6601E-01 | 1.1602E-01 | -4.7907E-02 | 1.0400E-02 | -8.6937E-04 |
| S2 | 7.8435E-02 | 2.0091E-01 | -6.9460E-01 | 1.6573E+00 | -2.5966E+00 | 2.6469E+00 | -1.6793E+00 | 5.8949E-01 | -8.5801E-02 |
| S3 | -1.2588E-01 | 4.4088E-01 | -1.7206E+00 | 4.5063E+00 | -7.5986E+00 | 8.0288E+00 | -5.0149E+00 | 1.6077E+00 | -1.7258E-01 |
| S4 | -1.3496E-01 | -1.5106E-01 | 1.2047E+00 | -4.6734E+00 | 1.1024E+01 | -1.6066E+01 | 1.4240E+01 | -7.1005E+00 | 1.5641E+00 |
| S5 | -1.1470E-01 | 2.2261E-01 | -1.8976E+00 | 7.7937E+00 | -2.0080E+01 | 3.2515E+01 | -3.1955E+01 | 1.7455E+01 | -4.0725E+00 |
| S6 | -8.5209E-02 | 1.2194E-01 | -1.2390E+00 | 4.3774E+00 | -9.7672E+00 | 1.3740E+01 | -1.1629E+01 | 5.4032E+00 | -1.0596E+00 |
| S7 | 1.0947E-01 | -3.8189E-01 | 6.6017E-01 | -4.5011E-01 | -1.5331E+00 | 5.6670E+00 | -7.3517E+00 | 4.2745E+00 | -9.3649E-01 |
| S8 | 2.3092E-01 | -1.0936E+00 | 1.7077E+00 | -1.2813E+00 | -1.4967E-01 | 1.6019E+00 | -1.6926E+00 | 7.6562E-01 | -1.2971E-01 |
| S9 | 3.2775E-01 | -1.0175E+00 | 1.7436E+00 | -2.3682E+00 | 2.3886E+00 | -1.6484E+00 | 7.2878E-01 | -1.8617E-01 | 2.0846E-02 |
| S10 | 1.4123E-01 | 7.4017E-02 | -4.8740E-01 | 6.0144E-01 | -4.0809E-01 | 1.7350E-01 | -4.3399E-02 | 5.2015E-03 | -1.5433E-04 |
| S11 | 6.7350E-02 | -2.1382E-01 | 2.1729E-01 | -1.9642E-01 | 1.2689E-01 | -5.2373E-02 | 1.3024E-02 | -1.7695E-03 | 1.0067E-04 |
| S12 | -1.1188E-02 | -3.2558E-02 | -3.4232E-02 | 4.9445E-02 | -2.7541E-02 | 8.4562E-03 | -1.4537E-03 | 1.2533E-04 | -3.8340E-06 |
| S13 | -5.6083E-01 | 2.9348E-01 | -1.4902E-01 | 7.2701E-02 | -2.4835E-02 | 5.3206E-03 | -6.8511E-04 | 4.8633E-05 | -1.4651E-06 |
| S14 | -6.8627E-01 | 5.3563E-01 | -3.3808E-01 | 1.4342E-01 | -3.8671E-02 | 6.5407E-03 | -6.7246E-04 | 3.8416E-05 | -9.3563E-07 |
Table 12
Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens group of embodiment 6, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 12B shows an astigmatism curve of the imaging lens group of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the imaging lens group of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a magnification chromatic aberration curve of the imaging lens group of embodiment 6, which represents a deviation of different image heights on an imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens group provided in embodiment 6 can achieve good imaging quality.
In summary, examples 1 to 6 satisfy the relationships shown in table 13, respectively.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 |
| TTL/ImgH×f | 4.20 | 4.54 | 3.62 | 5.39 | 4.57 | 5.20 |
| f5/f | 1.47 | 1.56 | 2.81 | 1.69 | 1.42 | 1.31 |
| R11/R12 | 0.99 | 0.94 | 0.77 | 1.10 | 1.03 | 1.05 |
| f7/R10 | 3.93 | 2.77 | 3.04 | 2.57 | 5.40 | 2.94 |
| CT2/T23 | 1.49 | 1.55 | 1.63 | 1.10 | 2.73 | 1.22 |
| f/R3 | 1.88 | 1.90 | 0.86 | 1.68 | 1.73 | 1.98 |
| ΣAT/TD | 0.33 | 0.35 | 0.33 | 0.32 | 0.40 | 0.418 |
| (SAG21+SAG22)/(SAG21-SAG22) | 1.95 | 1.79 | 1.995 | 1.28 | 1.15 | 1.52 |
| (DT61+DT62)/(DT61-DT62) | -13.00 | -12.43 | -13.80 | -7.95 | -10.78 | -16.56 |
| f7/f4 | 2.30 | 1.48 | 0.85 | 1.51 | 3.03 | 1.42 |
TABLE 13
The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging apparatus is equipped with the above-described imaging lens group.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (8)
1. The imaging lens assembly is characterized by comprising, in order from an object side to an image side along an optical axis:
a first lens having negative optical power;
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;
A diaphragm;
a third lens having positive optical power, the object side surface of which is a convex surface;
A fourth lens with negative focal power, the object side surface of which is a concave surface;
a fifth lens having positive optical power, an image side surface of which is convex;
a sixth lens element with optical power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the sixth lens element has an inflection point; and
A seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface, wherein at least one of the object-side surface and the image-side surface of the seventh lens element has an inflection point;
Wherein, the maximum effective radius DT61 of the object side surface of the sixth lens and the maximum effective radius DT62 of the image side surface of the sixth lens satisfy: -20.00 < (dt61+dt62)/(DT 61-DT 62) < -7.00;
The radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy: R11/R12 is more than 0.70 and less than 1.20;
An effective focal length f7 of the seventh lens and an effective focal length f4 of the fourth lens satisfy: f7/f4 is more than or equal to 1.42 and less than 3.50;
the number of lenses having optical power in the imaging lens group is seven.
2. The imaging lens group according to claim 1, wherein an effective focal length f7 of the seventh lens and a radius of curvature R10 of an image side surface of the fifth lens satisfy: 2.50 < f7/R10 < 5.50.
3. The imaging lens group according to claim 1, wherein a center thickness CT2 of the second lens on the optical axis and a separation distance T23 of the second lens and the third lens on the optical axis satisfy: CT2/T23 is more than 1.00 and less than 3.00.
4. The imaging lens group according to claim 1, wherein a total effective focal length f of the imaging lens group and a radius of curvature R3 of an object side surface of the second lens satisfy: 0.50 < f/R3 < 2.00.
5. The imaging lens group according to claim 1, wherein a sum Σat of a distance TD on the optical axis between an object side surface of the first lens and an image side surface of the seventh lens and a distance separating any adjacent two lenses having optical power of the first lens to the seventh lens on the optical axis satisfies: sigma AT/TD is more than or equal to 0.32 and less than 0.42.
6. The imaging lens set according to claim 1, wherein a distance SAG21 on the optical axis from an intersection of the object side surface of the second lens and the optical axis to an effective radius vertex of the object side surface of the second lens and a distance SAG22 on the optical axis from an intersection of the image side surface of the second lens and the optical axis to an effective radius vertex of the image side surface of the second lens satisfy: 1.00 < (SAG21+SAG22)/(SAG 21-SAG 22) < 2.00.
7. The imaging lens group according to claim 1, 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 group, a half of a diagonal length of an effective pixel area on the imaging surface of the imaging lens group, imgH, and a total effective focal length f of the imaging lens group satisfy: 3.00 mm < TTL/ImgH×f < 6.00 mm.
8. The imaging lens group according to claim 1, wherein an effective focal length f5 of the fifth lens and a total effective focal length f of the imaging lens group satisfy: 1.00 < f5/f < 3.00.
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| WO2021128064A1 (en) * | 2019-12-25 | 2021-07-01 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Imaging lens, camera module and imaging device |
| CN111123478A (en) * | 2020-01-15 | 2020-05-08 | 浙江舜宇光学有限公司 | Camera lens group |
| CN111367047B (en) * | 2020-03-31 | 2024-06-18 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| TWI726734B (en) | 2020-05-29 | 2021-05-01 | 大立光電股份有限公司 | Image capturing lens assembly, imaging apparatus and electronic device |
| CN111736302B (en) * | 2020-07-09 | 2020-11-13 | 诚瑞光学(常州)股份有限公司 | Image pickup optical lens |
| JP7481186B2 (en) | 2020-07-27 | 2024-05-10 | 東京晨美光学電子株式会社 | Imaging lens |
| CN111856725B (en) * | 2020-09-03 | 2024-11-19 | 浙江舜宇光学有限公司 | Camera lens set |
| TWI803041B (en) | 2021-11-03 | 2023-05-21 | 大立光電股份有限公司 | Optical photographing system, image capturing unit and electronic device |
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