CN115951477A - Imaging lens - Google Patents
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- CN115951477A CN115951477A CN202310160820.6A CN202310160820A CN115951477A CN 115951477 A CN115951477 A CN 115951477A CN 202310160820 A CN202310160820 A CN 202310160820A CN 115951477 A CN115951477 A CN 115951477A
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Abstract
The application discloses imaging lens, this imaging lens includes along optical axis by thing side to image side in proper order: a first lens having a positive optical power; a second lens; a third lens; a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; a fifth lens; a sixth lens element having a concave image-side surface; and a seventh lens, wherein the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens and the maximum half field angle Semi-FOV of the imaging lens satisfy: 8.0mm < (f 1+ | f7 |) × tan (Semi-FOV) <11.5mm; half of the height of an image ImgH corresponding to the maximum field angle of the imaging lens, the entrance pupil diameter EPD of the imaging lens and the f-number Fno of the imaging lens meet the following requirements: 3.5 yarn of Tna imgH/EPD multiplied by Fno <5.5; and a distance SAG51 on the optical axis between the intersection point of the object side surface of the fifth lens and the optical axis and the effective diameter vertex of the object side surface of the fifth lens, a distance SAG61 on the optical axis between the intersection point of the object side surface of the sixth lens and the optical axis and the effective diameter vertex of the object side surface of the sixth lens, and an air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy: -9.0< (SAG 51+ SAG 61)/T56 < -2.5.
Description
Technical Field
The present application relates to the field of optical elements, and in particular, to an imaging lens.
Background
In recent years, with the popularity of the folding screen mobile phone, the electronic product is also developing towards the trend of good function and light and thin appearance, and the miniaturized imaging lens with good imaging quality is definitely the mainstream in the market at present, but the miniaturized imaging lens has the contradiction between the pixel height and the total lens length. On the other hand, the performance improvement and the size reduction of the image sensor also enable the design freedom degree of the corresponding lens to be smaller and smaller, and the design difficulty of the corresponding lens is increased. Therefore, on the basis of ensuring the miniaturization of the lens, achieving a large field angle and a large image plane and having good imaging quality are the main development directions of various lens manufacturers for improving the self competitiveness at present.
Disclosure of Invention
The present application provides an imaging lens including, in order from an object side to an image side along an optical axis: a first lens having a positive optical power; a second lens; a third lens; a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a fifth lens; a sixth lens element having a concave image-side surface; and a seventh lens, wherein the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens and the maximum half field angle Semi-FOV of the imaging lens satisfy: 8.0mm < (f 1+ | f7 |) × tan (Semi-FOV) <11.5mm; half of the height of an image ImgH corresponding to the maximum field angle of the imaging lens, the entrance pupil diameter EPD of the imaging lens and the f-number Fno of the imaging lens meet the following requirements: 3.5<ImgH/EPD multiplied by Fno <5.5; and a distance SAG51 on the optical axis between the intersection point of the object side surface of the fifth lens and the optical axis and the effective diameter vertex of the object side surface of the fifth lens, a distance SAG61 on the optical axis between the intersection point of the object side surface of the sixth lens and the optical axis and the effective diameter vertex of the object side surface of the sixth lens, and an air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy: -9.0< (SAG 51+ SAG 61)/T56 < -2.5.
In one embodiment, a distance TTL from an object side surface of the first lens element to an image plane of the imaging lens on an optical axis, a half ImgH of an image height corresponding to a maximum field angle of the imaging lens, and an f-number Fno of the imaging lens satisfy: 1.5 were woven ttl/ImgH × Fno <3.0.
In one embodiment, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens, the effective focal length f of the imaging lens, and the maximum half field angle Semi-FOV of the imaging lens satisfy: 1.0 sTTL/f × Tan (Semi-FOV) <1.5.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens element and the radius of curvature R14 of the image-side surface of the seventh lens element satisfy: 0.5 sR11/R14 <2.0.
In one embodiment, the effective focal length f1 of the first lens, the radius of curvature R1 of the object-side surface of the first lens, and the radius of curvature R2 of the image-side surface of the first lens satisfy: 2.0< (f 1/R1) × (R2/f 1) <4.5.
In one embodiment, the second lens element has a convex object-side surface and a concave image-side surface.
In one embodiment, an air interval T45 between the fourth lens and the fifth lens on the optical axis, an air interval T56 between the fifth lens and the sixth lens on the optical axis, an air interval T67 between the sixth lens and the seventh lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, and a central thickness CT6 of the sixth lens on the optical axis satisfy: 0.8< (T45 + T56+ T67)/(CT 5+ CT 6) <2.8.
In one embodiment, the effective semi-aperture diameter DT62 of the image-side surface of the sixth lens element and the effective semi-aperture diameter DT52 of the image-side surface of the fifth lens element satisfy: 3.5< (DT 62+ DT 52)/(DT 62-DT 52) <10.0.
In one embodiment, a distance SAG52 on the optical axis between an intersection point of the image-side surface of the sixth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens, and a distance SAG62 on the optical axis between an intersection point of the image-side surface of the sixth lens and the optical axis and an effective radius vertex of the image-side surface of the sixth lens satisfy: -8.5 sNt DT52/SAG52+ DT62/SAG62< -5.5.
In one embodiment, a distance SAG71 on the optical axis between an intersection point of the object-side surface of the seventh lens and the optical axis to an effective radius vertex of the object-side surface of the seventh lens, a distance SAG72 on the optical axis between an intersection point of the image-side surface of the seventh lens and the optical axis to an effective radius vertex of the image-side surface of the seventh lens, and a central thickness CT7 on the optical axis of the seventh lens satisfy: -11.8< (SAG 71+ SAG 72)/CT 7< -2.5.
In one embodiment, the central thickness CT6 of the sixth lens on the optical axis and the edge thickness ET6 at the maximum effective radius of the sixth lens satisfy: 2.0< (CT 6+ ET 6)/ET 6<3.8.
In one embodiment, the effective half aperture DT61 of the sixth lens and the edge thickness ET6 at the maximum effective half aperture of the sixth lens satisfy: 3.5 were constructed of DT61/ET6<12.0.
In one embodiment, the effective focal length f7 of the seventh lens and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: -3.0 sj < -7/R14 < -0.5.
In one embodiment, a distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the imaging lens, a central thickness CT5 on the optical axis of the fifth lens, a central thickness CT6 on the optical axis of the sixth lens, and a central thickness CT7 on the optical axis of the seventh lens satisfy: 3.5 are woven into TTL/(CT 5+ CT6+ CT 7) <6.0.
In one embodiment, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, the refractive index N5 of the fifth lens and the refractive index N7 of the seventh lens satisfy: 1.0 sP CT5/CT7+ N5/N7<5.0.
According to the imaging lens, the object side surface of the fourth lens is set to be the convex surface, the image side surface is set to be the concave surface, the image side surface of the sixth lens is set to be the concave surface, the relation between the focal power of the first lens and the focal power of the seventh lens and the maximum half field angle of the imaging lens is reasonably matched, the front vector of the fifth lens, the front vector of the sixth lens and the gap between the fifth lens and the sixth lens are controlled, the good machinability of the lenses can be guaranteed, meanwhile, the small incident angle of the principal ray of the imaging lens when the principal ray of the imaging lens is incident on the image surface can be guaranteed, the relative illumination of the image surface is improved, and the imaging lens has the advantage of a large image surface; by reasonably controlling the ratios of ImgH, EPD and Fno, the realization of shorter total optical length TTL is facilitated while the realization of larger imaging height is facilitated, the miniaturization of the lens is facilitated, and the improvement of the imaging quality is facilitated.
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 following drawings:
fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;
fig. 2A to 2C show an on-axis chromatic aberration curve, an astigmatism curve, and a magnification chromatic aberration curve of the imaging lens of embodiment 1, respectively;
fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;
fig. 4A to 4C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of the imaging lens of embodiment 2;
fig. 5 is a schematic structural view showing an imaging lens according to embodiment 3 of the present application;
fig. 6A to 6C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of an imaging lens of embodiment 3;
fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application;
fig. 8A to 8C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of an imaging lens of embodiment 4;
fig. 9 is a schematic structural view showing an imaging lens according to embodiment 5 of the present application;
fig. 10A to 10C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of an imaging lens of embodiment 5;
fig. 11 is a schematic structural view showing an imaging lens according to embodiment 6 of the present application;
fig. 12A to 12C show an on-axis chromatic aberration curve, an astigmatism curve, and a magnification chromatic aberration curve, respectively, of an imaging lens of embodiment 6;
fig. 13 is a schematic structural view showing an imaging lens according to embodiment 7 of the present application; and
fig. 14A to 14C show an on-axis chromatic aberration curve, an astigmatism curve, and a chromatic aberration of magnification curve, respectively, of an imaging lens of embodiment 7.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to examples or illustrations.
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 imaging lens according to an exemplary embodiment of the present application may include seven lenses having optical powers, which are 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 along the optical axis in sequence from the object side to the image side. Any adjacent two lenses of the first lens to the seventh lens may have a spacing distance therebetween.
The first lens of the imaging lens according to the exemplary embodiment of the present application may have a positive power, and the fourth lens may have a negative power. The object side surface of the fourth lens is set to be convex, the image side surface is set to be concave, the image side surface of the sixth lens is set to be concave, the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens, the maximum half field angle Semi-FOV of the imaging lens, half imgH of the image height corresponding to the maximum field angle of the imaging lens, the pupil entrance diameter EPD of the imaging lens and the f-number Fno of the imaging lens, the distance SAG51 on the optical axis between the intersection point of the object side surface of the fifth lens and the optical axis and the effective diameter vertex of the object side surface of the fifth lens, the distance SAG61 on the optical axis between the intersection point of the object side surface of the sixth lens and the optical axis and the effective diameter vertex of the object side surface of the sixth lens, and the air space T56 on the optical axis of the fifth lens and the sixth lens satisfy: 8.0mm < (f 1+ | f7 |) × tan (Semi-FOV) <11.5mm, 3.5< imgH/EPD × Fno <5.5 and-9.0 < (SAG 51+ SAG 61)/T56 < -2.5, which are beneficial to ensuring good processability of the first lens and the seventh lens and enabling the imaging lens to have the advantage of large field angle and simultaneously reducing the incidence angle of chief rays of the imaging lens to an image plane and improving the image plane relative illumination; on the other hand, the lens is favorable for realizing the short total optical length TTL while realizing the larger imaging height, the miniaturization of the lens is favorable for realizing, and the imaging quality is favorable for improving. In addition, by controlling the front vector of the fifth lens, the front vector of the sixth lens and the gap between the fifth lens and the sixth lens, the imaging lens is favorable for having a smaller incident angle and higher relative illumination when the chief ray of the imaging lens is incident on the image plane, and is also favorable for enabling the fifth lens and the sixth lens to have better processability.
In an exemplary embodiment, the first lens may have a positive optical power; the second lens may have a negative optical power; the third lens may have a positive optical power; the fourth lens may have a negative optical power; the fifth lens may have a positive power or a negative power; the sixth lens may have a positive power or a negative power; the seventh lens may have a negative optical power. Through the reasonable lens number, the surface type and the focal power, the optical total length of the imaging lens can be effectively reduced, and the system is ensured to have higher imaging quality.
In an exemplary embodiment, an imaging lens according to an exemplary embodiment of the present application further includes a stop disposed on an object side surface of the first lens.
In an exemplary embodiment, an imaging lens according to an exemplary embodiment of the present application further includes a stop disposed on an image side surface of the second lens.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.5 & ltTTL/ImgH & ltFno & lt 3.0 & gt, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis, imgH is half of the image height corresponding to the maximum field angle of the imaging lens, and Fno is the f-number of the imaging lens. Satisfy 1.5 ttl/ImgH × Fno <3.0 in the institute, rationally set up the ratio between the distance on the axle of the object side face of first lens to the imaging plane and the half of the image height that imaging lens maximum field angle corresponds, ensure that imaging lens has frivolous characteristics.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.0 & <TTL/f multiplied by Tan (Semi-FOV) <1.5, wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis, f is the effective focal length of the imaging lens, and Semi-FOV is the maximum half field angle of the imaging lens. The requirements that 1.0 woven TTL/f multiplied Tan (Semi-FOV) <1.5 are met, the ratio of the on-axis distance from the object side surface of the first lens to the imaging surface to the maximum half field angle of the imaging lens is reasonably set, and the imaging lens meets the requirements of a large image surface and a large field angle are met.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.5< -R11/R14 <2.0, wherein R11 is a radius of curvature of an object-side surface of the sixth lens element, and R14 is a radius of curvature of an image-side surface of the seventh lens element. The requirement that 0.5 is made of a fabric of R11/R14<2.0 is met, the ratio range of the curvature radii of the object side surface of the sixth lens and the image side surface of the seventh lens is reasonably controlled, the sensitivity of the imaging lens is favorably reduced, and the characteristics of large image surface, large aperture and high resolution of the imaging lens are favorably realized.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 2.0< (f 1/R1) × (R2/f 1) <4.5, where f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object-side surface of the first lens, and R2 is the radius of curvature of the image-side surface of the first lens. The optical lens meets the requirement of 2.0< (f 1/R1) × (R2/f 1) <4.5, the ratio of the effective focal length of the first lens to the curvature radius of the object side surface of the first lens and the product range of the ratio of the curvature radius of the image side surface of the first lens to the effective focal length of the first lens are reasonably controlled, the optical effective caliber and the surface type of the first lens are favorably controlled, the machinability of the first lens is ensured, and the sensitivity of the imaging lens is reduced.
In an exemplary embodiment, the second lens element of the imaging lens according to the present application has a convex object-side surface and a concave image-side surface. The arrangement is favorable for correcting the aberration generated by the first lens and improving the performance of the imaging lens.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.8< (T45 + T56+ T67)/(CT 5+ CT 6) <2.8, where T45 is an air space between the fourth lens and the fifth lens on the optical axis, T56 is an air space between the fifth lens and the sixth lens on the optical axis, T67 is an air space between the sixth lens and the seventh lens on the optical axis, CT5 is a center thickness of the fifth lens on the optical axis, and CT6 is a center thickness of the sixth lens on the optical axis. The center thickness of the fifth lens and the sixth lens, the air interval of the fourth lens and the fifth lens on the optical axis, the air interval of the fifth lens and the sixth lens on the optical axis, the air interval of the sixth lens and the sixth lens on the optical axis, and the air interval of the sixth lens and the seventh lens on the optical axis are reasonably distributed, the size of the rear end of the imaging lens can be effectively reduced, the lens is enabled to be miniaturized, the system sensitivity is reduced, and the optical resolution is improved.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3.5< (DT 62+ DT 52)/(DT 62-DT 52) <10.0, wherein DT62 is the effective half aperture of the image side surface of the sixth lens and DT52 is the effective half aperture of the image side surface of the fifth lens. The requirements of 3.5< (DT 62+ DT 52)/(DT 62-DT 52) <10.0 are met, the effective half calibers of the image side surfaces of the fifth lens and the sixth lens are reasonably distributed, the outer diameter of the image side end of the imaging lens is ensured to be within a certain range, and the imaging lens is favorably miniaturized.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: -8.5 Ap DT52/SAG52+ DT62/SAG62< -5.5 >, wherein DT62 is the effective half aperture of the image-side surface of the sixth lens, DT52 is the effective half aperture of the image-side surface of the fifth lens, SAG52 is the distance on the optical axis between the intersection of the image-side surface of the fifth lens and the optical axis and the effective radius vertex of the image-side surface of the fifth lens, and SAG62 is the distance on the optical axis between the intersection of the image-side surface of the sixth lens and the optical axis and the effective radius vertex of the image-side surface of the sixth lens. The requirements of-8.5-woven fabric DT52/SAG52+ DT62/SAG62< -5.5 are met, the deflection angle of the main ray is favorably and reasonably controlled, the matching degree of the imaging lens and the chip is improved, and the structure of the imaging lens is favorably adjusted.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 11.8< (SAG 71+ SAG 72)/CT 7< -2.5, wherein SAG71 is the distance on the optical axis between the intersection point of the object side surface of the seventh lens and the optical axis and the effective radius vertex of the object side surface of the seventh lens, SAG72 is the distance on the optical axis between the intersection point of the image side surface of the seventh lens and the optical axis and the effective radius vertex of the image side surface of the seventh lens, and CT7 is the central thickness of the seventh lens on the optical axis. Satisfying 11.8< (SAG 71+ SAG 72)/CT 7< -2.5, workability of the seventh lens can be ensured, and sensitivity of the seventh lens can be reduced.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 2.0< (CT 6+ ET 6)/ET 6<3.8, where CT6 is the central thickness of the sixth lens on the optical axis and ET6 is the edge thickness at the maximum effective radius of the sixth lens. 2.0< (CT 6+ ET 6)/ET 6<3.8 is satisfied, which is beneficial to reasonably controlling the thickness ratio of the sixth lens and ensuring the processability of the sixth lens.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3.5-straw dt61/ET6<12.0, wherein DT61 is the effective half aperture of the sixth lens and ET6 is the edge thickness at the maximum effective half aperture of the sixth lens. Satisfy 3.5 and be the DT61 ET6 of the cloth less than 12.0, can effectively reduce imaging lens's rear end size, guarantee the camera lens miniaturization, and control rear end lens external diameter size helps imaging lens's equipment.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: -3.0 and f7/R14< -0.5, wherein f7 is the effective focal length of the seventh lens, and R14 is the radius of curvature of the image side surface of the seventh lens. Satisfy-3.0 and cover f7/R14< -0.5, rationally set up the effective focal length of seventh lens and the radius of curvature of the image side of seventh lens, be favorable to guaranteeing that seventh lens has suitable focal power, reduce the chief ray and incident on the image side and the contained angle of optical axis simultaneously, promote the illumination intensity on image plane.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 3.5 <ttl/(CT 5+ CT6+ CT 7) <6.0, where TTL is a distance on the optical axis from the object-side surface of the first lens to the imaging surface of the imaging lens, CT5 is a central thickness of the fifth lens on the optical axis, CT6 is a central thickness of the sixth lens on the optical axis, and CT7 is a central thickness of the seventh lens on the optical axis. Satisfy 3.5 ttl/(CT 5+ CT6+ CT 7) <6.0 once, be favorable to reducing imaging lens's sensitivity to can effectively shorten imaging lens's overall length.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.0< -CT5/CT 7+ N5/N7<5.0 >, wherein CT5 is a central thickness of the fifth lens on the optical axis, CT7 is a central thickness of the seventh lens on the optical axis, N5 is a refractive index of the fifth lens, and N7 is a refractive index of the seventh lens. The requirements that 1.0-woven CT5/CT7+ N5/N7 is less than 5.0 are met, the structure of the imaging lens can be effectively controlled, better aberration balance of the imaging lens is facilitated, and meanwhile the resolution power of the system is improved.
In an exemplary embodiment, at least one of the mirror surfaces of each of the first to seventh lenses is an aspherical mirror surface. The specific number of spherical lenses and aspheric lenses is not specifically limited in the present application, and if the resolution quality is focused, the lenses may all use aspheric lenses. The aspheric lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. The spherical lens is characterized in that: there is a constant curvature from the center to the periphery of the lens. The aspheric lens has better curvature radius characteristics, and has the advantages of improving distortion aberration and astigmatic aberration. After the aspheric lens is adopted, the aberration generated in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, the object-side surface and the image-side surface of each of the first lens to the seventh lens are aspheric mirror surfaces.
In an exemplary embodiment, the effective focal length f of the imaging lens may be, for example, in the range of 4.4mm to 5.3mm, the effective focal length f1 of the first lens may be, for example, in the range of 4.7mm to 6.1mm, the effective focal length f2 of the second lens may be, for example, in the range of-23.9 mm and-11.6 mm, the effective focal length f3 of the third lens may be, for example, in the range of 15.5mm to 43.7mm, the effective focal length f4 of the fourth lens may be, for example, in the range of-8277.2 mm to-19.9 mm, the effective focal length f5 of the fifth lens may be, for example, in the range of-25.0 mm to 6.4mm, the effective focal length f6 of the sixth lens may be, for example, in the range of-40.0 mm to 40.0mm, and the effective focal length f7 of the seventh lens may be, for example, in the range of-4.5 mm to-3.4 mm. The distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis can meet 5.7mm but TTL is less than 6.0mm. The maximum half field angle Semi-FOV of the imaging lens may be, for example, in the range of 43 ° to 48 °. The half ImgH of the image height corresponding to the maximum angle of field of the imaging lens may be, for example, in the range of 5.1mm to 5.4 mm.
In an exemplary embodiment, an imaging lens according to the present application further includes a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface.
The application provides an imaging lens with the characteristics of large image plane, high pixel, miniaturization, high imaging quality and the like. The imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, the above seven lenses. By reasonably distributing the focal power and the surface shape of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the imaging lens is more beneficial to production and processing. However, it will be appreciated by those skilled in the art that the number of lenses constituting the imaging lens can be varied to achieve the various results and advantages described in the present specification without departing from the claimed technical solution. For example, although seven lenses are exemplified in the embodiment, the imaging lens is not limited to include seven lenses. The imaging 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 2C. 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, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17. The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has a negative refractive power, and has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In this example, the effective focal length f of the imaging lens is 4.60mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.80mm, the half ImgH of the image height corresponding to the maximum field angle of the imaging lens is 5.20mm, the maximum half field angle Semi-FOV of the imaging lens is 46.49 °, and the f-number Fno of the imaging lens is 1.88.
Table 1 shows a basic parameter table of the imaging lens of embodiment 1, in which the units of the radius of curvature, the thickness, and the effective focal length are all millimeters (mm).
TABLE 1
In embodiment 1, both the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 are aspheric. The profile x of each aspheric lens can be defined using, but not limited to, the following aspheric equation:
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 =1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The high-order coefficient A for each of the aspherical mirror surfaces S1 to S14 used in example 1 is shown in Table 2-1 and Table 2-2 below 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 3.39E-02 | -3.49E-03 | 1.95E-02 | -2.73E-02 | 1.86E-02 | 2.58E-03 | -1.28E-02 |
| S2 | -1.52E-02 | 5.98E-03 | -2.01E-02 | 2.95E-02 | -1.51E-02 | -1.38E-02 | 2.42E-02 |
| S3 | -4.17E-02 | 4.09E-03 | 9.64E-02 | -2.63E-01 | 4.65E-01 | -5.16E-01 | 3.46E-01 |
| S4 | -3.53E-02 | 2.09E-02 | 1.98E-02 | 4.29E-03 | -5.65E-02 | 9.99E-02 | -8.72E-02 |
| S5 | -2.95E-02 | 2.07E-02 | -6.59E-02 | -7.25E-02 | 7.60E-01 | -2.19E+00 | 3.67E+00 |
| S6 | -6.78E-02 | 1.07E-01 | -3.28E-01 | 8.39E-01 | -1.88E+00 | 3.31E+00 | -4.38E+00 |
| S7 | -1.91E-01 | 2.49E-01 | -8.48E-01 | 2.65E+00 | -5.98E+00 | 9.42E+00 | -1.05E+01 |
| S8 | -1.54E-01 | 2.13E-01 | -5.81E-01 | 1.33E+00 | -2.19E+00 | 2.53E+00 | -2.07E+00 |
| S9 | 2.46E-02 | 6.31E-02 | -3.30E-01 | 7.56E-01 | -1.07E+00 | 1.03E+00 | -6.96E-01 |
| S10 | 5.26E-02 | -1.66E-01 | 1.73E-01 | -6.43E-02 | -5.44E-02 | 1.00E-01 | -7.64E-02 |
| S11 | 1.14E-01 | -2.32E-01 | 1.94E-01 | -1.15E-01 | 4.99E-02 | -1.56E-02 | 3.49E-03 |
| S12 | 1.29E-01 | -1.54E-01 | 8.10E-02 | -2.39E-02 | 1.59E-03 | 1.97E-03 | -1.02E-03 |
| S13 | -7.26E-02 | 9.11E-03 | 6.61E-03 | -4.38E-03 | 1.45E-03 | -3.10E-04 | 4.53E-05 |
| S14 | -3.98E-02 | -3.17E-03 | 9.64E-03 | -4.71E-03 | 1.31E-03 | -2.40E-04 | 3.02E-05 |
TABLE 2-1
Tables 2 to 2
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 lens. Fig. 2B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 1. Fig. 2C 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 lens. As can be seen from fig. 2A to 2C, the imaging lens 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 4C. In this embodiment and the following embodiments, a description 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, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17. The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive refractive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has a negative refractive power, and has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In this example, the effective focal length f of the imaging lens is 4.87mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.98mm, the half ImgH of the image height corresponding to the maximum field angle of the imaging lens is 5.36mm, the maximum half field angle Semi-FOV of the imaging lens is 47.28 °, and the f-number Fno of the imaging lens is 1.88.
Table 3 shows a basic parameter table of the imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness, and the effective focal length are all millimeters (mm). Tables 4-1 and 4-2 show high-order term coefficients that can be used for each aspherical mirror in example 2, wherein each aspherical mirror type can be defined by the formula (1) given in example 1 above.
TABLE 3
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.69E-02 | 3.95E-02 | -1.33E-01 | 2.98E-01 | -4.17E-01 | 3.69E-01 | -2.00E-01 |
| S2 | -1.23E-02 | -1.52E-02 | 6.53E-02 | -1.74E-01 | 2.78E-01 | -2.71E-01 | 1.57E-01 |
| S3 | -3.79E-02 | 7.77E-03 | 4.05E-02 | -8.02E-02 | 1.25E-01 | -1.31E-01 | 8.42E-02 |
| S4 | -3.48E-02 | 3.43E-02 | -6.61E-02 | 2.35E-01 | -4.19E-01 | 4.53E-01 | -2.96E-01 |
| S5 | -3.82E-02 | 9.97E-02 | -5.55E-01 | 1.79E+00 | -3.87E+00 | 5.66E+00 | -5.60E+00 |
| S6 | -6.01E-02 | 1.15E-01 | -5.28E-01 | 1.87E+00 | -4.85E+00 | 8.85E+00 | -1.14E+01 |
| S7 | -2.02E-01 | 4.08E-01 | -1.70E+00 | 5.23E+00 | -1.10E+01 | 1.63E+01 | -1.72E+01 |
| S8 | -1.63E-01 | 2.94E-01 | -9.87E-01 | 2.41E+00 | -4.03E+00 | 4.71E+00 | -3.91E+00 |
| S9 | 2.28E-02 | 3.87E-02 | -1.35E-01 | 1.87E-01 | -1.49E-01 | 7.24E-02 | -2.07E-02 |
| S10 | 5.01E-02 | -1.59E-01 | 1.85E-01 | -1.31E-01 | 5.67E-02 | -4.86E-03 | -1.20E-02 |
| S11 | 1.22E-01 | -2.57E-01 | 2.17E-01 | -1.29E-01 | 5.69E-02 | -1.83E-02 | 4.20E-03 |
| S12 | 1.40E-01 | -1.72E-01 | 9.13E-02 | -2.57E-02 | 1.20E-05 | 3.37E-03 | -1.61E-03 |
| S13 | -7.77E-02 | 1.28E-02 | 5.13E-03 | -4.05E-03 | 1.45E-03 | -3.25E-04 | 4.96E-05 |
| S14 | -5.00E-02 | 4.62E-03 | 6.13E-03 | -4.20E-03 | 1.54E-03 | -3.78E-04 | 6.53E-05 |
TABLE 4-1
TABLE 4-2
Fig. 4A shows on-axis chromatic aberration curves of the imaging lens of embodiment 2, which represent the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 2. Fig. 4C 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 surface after light passes through the lens. As can be seen from fig. 4A to 4C, 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 6C. 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, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17. The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has a negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In this example, the effective focal length f of the imaging lens is 4.50mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.84mm, the half ImgH of the image height corresponding to the maximum field angle of the imaging lens is 5.30mm, the maximum half field angle Semi-FOV of the imaging lens is 46.97 °, and the f-number Fno of the imaging lens is 2.00.
Table 5 shows a basic parameter table of the imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness, and the effective focal length are all millimeters (mm). Tables 6-1 and 6-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
TABLE 5
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.83E-02 | -2.07E-02 | 8.34E-02 | -1.86E-01 | 2.63E-01 | -2.37E-01 | 1.32E-01 |
| S2 | -1.21E-02 | -8.97E-03 | 4.15E-02 | -1.11E-01 | 1.82E-01 | -1.88E-01 | 1.18E-01 |
| S3 | -6.62E-02 | 1.10E-01 | -2.97E-01 | 7.79E-01 | -1.32E+00 | 1.41E+00 | -9.22E-01 |
| S4 | -4.65E-02 | 5.24E-02 | 2.32E-02 | -1.97E-01 | 5.66E-01 | -9.36E-01 | 9.56E-01 |
| S5 | -2.94E-02 | -9.06E-02 | 1.03E+00 | -6.64E+00 | 2.70E+01 | -7.42E+01 | 1.43E+02 |
| S6 | -6.60E-02 | 1.53E-01 | -7.45E-01 | 2.38E+00 | -5.16E+00 | 7.69E+00 | -7.95E+00 |
| S7 | -2.14E-01 | 6.77E-01 | -3.68E+00 | 1.33E+01 | -3.31E+01 | 5.83E+01 | -7.40E+01 |
| S8 | -1.23E-01 | 2.58E-01 | -1.14E+00 | 3.34E+00 | -6.79E+00 | 9.86E+00 | -1.03E+01 |
| S9 | 6.61E-03 | -1.04E-02 | 2.22E-01 | -7.74E-01 | 1.40E+00 | -1.62E+00 | 1.29E+00 |
| S10 | 6.59E-02 | -7.35E-02 | 3.70E-02 | 2.35E-02 | -6.52E-02 | 6.98E-02 | -4.79E-02 |
| S11 | 1.18E-01 | -2.12E-01 | 1.87E-01 | -1.61E-01 | 1.12E-01 | -5.19E-02 | 1.35E-02 |
| S12 | 9.76E-02 | -1.45E-01 | 1.04E-01 | -7.91E-02 | 5.73E-02 | -3.11E-02 | 1.17E-02 |
| S13 | -8.89E-02 | 7.50E-02 | -5.80E-02 | 3.27E-02 | -1.30E-02 | 3.69E-03 | -7.49E-04 |
| S14 | -9.97E-02 | 4.62E-02 | -1.84E-02 | 5.74E-03 | -1.43E-03 | 2.87E-04 | -4.57E-05 |
TABLE 6-1
TABLE 6-2
And a difference curve representing the deviation of the convergent focus of the light rays with different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 3. Fig. 6C 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 lens. As can be seen from fig. 6A to 6C, the imaging lens 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 8C. 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, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image plane S17. The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has positive power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has negative power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has a negative refractive power, and has a concave object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In this example, the effective focal length f of the imaging lens is 5.00mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.95mm, the half ImgH of the image height corresponding to the maximum field angle of the imaging lens is 5.31mm, the maximum half field angle Semi-FOV of the imaging lens is 43.70 °, and the f-number Fno of the imaging lens is 1.95.
Table 7 shows a basic parameter table of the imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness, and the effective focal length are all millimeters (mm). Tables 8-1 and 8-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
TABLE 7
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.83E-02 | -1.86E-02 | 7.07E-02 | -1.47E-01 | 1.93E-01 | -1.60E-01 | 8.13E-02 |
| S2 | -1.02E-02 | -3.34E-02 | 1.62E-01 | -4.20E-01 | 6.41E-01 | -5.96E-01 | 3.30E-01 |
| S3 | -4.79E-02 | 2.29E-02 | 5.20E-02 | -1.41E-01 | 2.13E-01 | -2.00E-01 | 1.12E-01 |
| S4 | -3.55E-02 | 3.03E-02 | 4.75E-02 | -1.50E-01 | 2.54E-01 | -2.60E-01 | 1.64E-01 |
| S5 | -2.94E-02 | -8.68E-02 | 9.44E-01 | -5.79E+00 | 2.24E+01 | -5.90E+01 | 1.09E+02 |
| S6 | -6.40E-02 | 1.48E-01 | -7.13E-01 | 2.25E+00 | -4.79E+00 | 7.01E+00 | -7.11E+00 |
| S7 | -1.40E-01 | -1.15E-02 | 5.80E-01 | -3.02E+00 | 8.62E+00 | -1.60E+01 | 2.05E+01 |
| S8 | -1.13E-01 | 5.36E-02 | 3.70E-02 | -5.37E-01 | 1.55E+00 | -2.55E+00 | 2.80E+00 |
| S9 | 6.62E-03 | -1.04E-02 | 2.22E-01 | -7.74E-01 | 1.40E+00 | -1.62E+00 | 1.29E+00 |
| S10 | 6.56E-02 | -7.07E-02 | 2.61E-02 | 4.63E-02 | -9.49E-02 | 9.55E-02 | -6.34E-02 |
| S11 | 1.14E-01 | -2.41E-01 | 2.26E-01 | -1.85E-01 | 1.29E-01 | -7.06E-02 | 2.97E-02 |
| S12 | 8.40E-02 | -1.29E-01 | 6.72E-02 | -1.95E-02 | 2.10E-03 | 1.12E-03 | -8.10E-04 |
| S13 | -7.51E-02 | 3.39E-02 | -8.17E-03 | -9.65E-04 | 1.30E-03 | -4.22E-04 | 7.81E-05 |
| S14 | -9.97E-02 | 4.62E-02 | -1.84E-02 | 5.74E-03 | -1.43E-03 | 2.87E-04 | -4.57E-05 |
TABLE 8-1
TABLE 8-2
Fig. 8A shows on-axis chromatic aberration curves of an imaging lens of embodiment 4, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 4. Fig. 8C 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 surface after light passes through the lens. As can be seen from fig. 8A to 8C, the imaging lens 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 10C. 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, 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 image forming surface S17. The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has a negative refractive power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In this example, the effective focal length f of the imaging lens is 4.80mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.83mm, the half ImgH of the image height corresponding to the maximum field angle of the imaging lens is 5.30mm, the maximum half field angle Semi-FOV of the imaging lens is 44.26 °, and the f-number Fno of the imaging lens is 1.89.
Table 9 shows a basic parameter table of the imaging lens of embodiment 5 in which the units of the radius of curvature, the thickness, and the effective focal length are millimeters (mm). Tables 10-1 and 10-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
TABLE 9
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.87E-02 | -5.13E-03 | 1.04E-02 | -1.28E-02 | 7.60E-03 | -1.97E-03 | -3.57E-04 |
| S2 | -2.04E-02 | 1.02E-02 | -1.79E-02 | 2.46E-02 | -2.61E-02 | 1.74E-02 | -6.87E-03 |
| S3 | -2.62E-02 | 1.08E-01 | -7.42E-01 | 4.51E+00 | -1.79E+01 | 4.82E+01 | -9.00E+01 |
| S4 | -1.66E-02 | 2.94E-02 | 3.82E-02 | -1.46E-01 | 2.24E-01 | -1.71E-01 | 4.63E-02 |
| S5 | -2.71E-02 | 4.54E-02 | -2.33E-01 | 7.07E-01 | -1.34E+00 | 1.59E+00 | -1.13E+00 |
| S6 | -2.40E-02 | -2.68E-02 | 1.03E-01 | -2.65E-01 | 3.76E-01 | -3.08E-01 | 1.34E-01 |
| S7 | -7.82E-02 | -9.47E-03 | 4.67E-02 | -2.00E-01 | 4.28E-01 | -6.06E-01 | 5.75E-01 |
| S8 | -6.38E-02 | -5.96E-02 | 3.33E-01 | -1.05E+00 | 2.02E+00 | -2.53E+00 | 2.10E+00 |
| S9 | -4.33E-02 | -1.19E-01 | 6.00E-01 | -1.59E+00 | 2.83E+00 | -3.59E+00 | 3.32E+00 |
| S10 | -1.23E-01 | -4.49E-02 | 1.75E-01 | -1.73E-01 | 3.23E-02 | 1.09E-01 | -1.42E-01 |
| S11 | -1.87E-02 | -8.15E-02 | 9.35E-02 | -6.64E-02 | 2.97E-02 | -8.65E-03 | 1.70E-03 |
| S12 | 1.25E-01 | -1.20E-01 | 7.33E-02 | -3.31E-02 | 1.07E-02 | -2.42E-03 | 3.59E-04 |
| S13 | -1.24E-01 | -1.46E-03 | 3.85E-02 | -1.94E-02 | 4.92E-03 | -7.51E-04 | 7.07E-05 |
| S14 | -1.71E-01 | 5.93E-02 | -1.34E-02 | 1.98E-03 | -1.80E-04 | 7.85E-06 | 1.72E-07 |
TABLE 10-1
TABLE 10-2
Fig. 10A shows on-axis chromatic aberration curves of an imaging lens of embodiment 5, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 5. Fig. 10C 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 surface after light passes through the lens. As can be seen from fig. 10A to 10C, 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 12C. 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, 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 image forming surface S17. The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has a negative power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has a negative refractive power, and has a concave object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a convex image-side surface S12. The seventh lens element E7 has a negative refractive power, and has a concave object-side surface S13 and a concave image-side surface S14. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In this example, the effective focal length f of the imaging lens is 5.01mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.98mm, the half ImgH of the image height corresponding to the maximum field angle of the imaging lens is 5.36mm, the maximum half field angle Semi-FOV of the imaging lens is 46.28 °, and the f-number Fno of the imaging lens is 1.92.
Table 11 shows a basic parameter table of the imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness, and the effective focal length are all millimeters (mm). Tables 12-1 and 12-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
TABLE 11
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.44E-02 | 1.52E-02 | -4.07E-02 | 6.66E-02 | -7.06E-02 | 4.65E-02 | -1.87E-02 |
| S2 | -2.05E-02 | 2.21E-03 | 1.16E-02 | -2.85E-02 | 3.16E-02 | -2.13E-02 | 8.65E-03 |
| S3 | -2.16E-02 | 8.01E-02 | -4.34E-01 | 2.63E+00 | -1.06E+01 | 2.84E+01 | -5.27E+01 |
| S4 | -1.47E-02 | 4.83E-02 | -6.25E-02 | 1.64E-01 | -3.73E-01 | 5.18E-01 | -4.14E-01 |
| S5 | -2.87E-02 | 5.60E-02 | -2.83E-01 | 8.19E-01 | -1.47E+00 | 1.62E+00 | -1.06E+00 |
| S6 | -3.07E-02 | -5.37E-03 | 3.26E-02 | -1.23E-01 | 2.01E-01 | -1.82E-01 | 8.52E-02 |
| S7 | -9.14E-02 | 8.94E-02 | -3.93E-01 | 9.42E-01 | -1.45E+00 | 1.40E+00 | -8.20E-01 |
| S8 | -6.96E-02 | -1.36E-02 | 1.58E-01 | -6.83E-01 | 1.55E+00 | -2.17E+00 | 1.96E+00 |
| S9 | -5.66E-02 | -1.55E-02 | 8.28E-02 | -1.25E-01 | 1.09E-01 | -3.37E-02 | -7.27E-02 |
| S10 | -1.20E-01 | -6.75E-02 | 5.70E-02 | 2.38E-01 | -6.18E-01 | 7.62E-01 | -5.98E-01 |
| S11 | 1.73E-02 | -1.71E-01 | 1.94E-01 | -1.40E-01 | 6.58E-02 | -2.09E-02 | 4.58E-03 |
| S12 | 1.51E-01 | -1.63E-01 | 1.10E-01 | -5.48E-02 | 1.99E-02 | -5.18E-03 | 9.49E-04 |
| S13 | -1.17E-01 | -3.30E-02 | 7.80E-02 | -4.19E-02 | 1.25E-02 | -2.44E-03 | 3.33E-04 |
| S14 | -1.82E-01 | 6.52E-02 | -1.43E-02 | 2.00E-03 | -1.66E-04 | 5.15E-06 | 4.49E-07 |
TABLE 12-1
TABLE 12-2
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 lens. Fig. 12B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 6. Fig. 12C 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 lens. As can be seen from fig. 12A to 12C, 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 14C. 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, 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 image plane S17. The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has negative power, and the object-side surface S3 is convex and the image-side surface S4 is concave. The third lens element E3 has positive refractive power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has a negative refractive power, and has a convex object-side surface S7 and a concave image-side surface S8. The fifth lens element E5 has a negative refractive power, and has a convex object-side surface S9 and a concave image-side surface S10. The sixth lens element E6 has positive refractive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through the respective surfaces S1 to S16 in order and is finally imaged on the imaging plane S17.
In this example, the effective focal length f of the imaging lens is 5.20mm, the total length TTL of the imaging lens (i.e., the distance on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens) is 5.98mm, the half ImgH of the image height corresponding to the maximum field angle of the imaging lens is 5.25mm, the maximum half field angle Semi-FOV of the imaging lens is 44.71 °, and the f-number Fno of the imaging lens is 2.05.
Table 13 shows a basic parameter table of the imaging lens of embodiment 7, in which the units of the radius of curvature, the thickness, and the effective focal length are all millimeters (mm). Tables 14-1 and 14-2 show the high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by the formula (1) given in example 1 above.
Watch 13
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.39E-02 | 6.43E-02 | -3.85E-01 | 1.48E+00 | -3.83E+00 | 6.95E+00 | -8.99E+00 |
| S2 | -2.19E-02 | 1.83E-02 | -2.03E-01 | 1.34E+00 | -5.22E+00 | 1.32E+01 | -2.27E+01 |
| S3 | -1.63E-02 | -1.02E-02 | 8.11E-01 | -7.53E+00 | 4.15E+01 | -1.51E+02 | 3.78E+02 |
| S4 | 3.29E-03 | -1.65E-01 | 2.94E+00 | -2.57E+01 | 1.46E+02 | -5.69E+02 | 1.56E+03 |
| S5 | -1.25E-02 | -2.36E-01 | 3.70E+00 | -3.22E+01 | 1.78E+02 | -6.67E+02 | 1.75E+03 |
| S6 | -3.21E-02 | -2.88E-02 | 6.84E-01 | -5.25E+00 | 2.42E+01 | -7.56E+01 | 1.66E+02 |
| S7 | -8.54E-02 | 2.21E-01 | -2.02E+00 | 1.18E+01 | -4.65E+01 | 1.27E+02 | -2.44E+02 |
| S8 | -4.70E-02 | -1.20E-01 | 8.39E-01 | -3.61E+00 | 1.04E+01 | -2.09E+01 | 3.03E+01 |
| S9 | -4.93E-02 | -2.92E-01 | 1.00E+00 | -1.89E+00 | 2.45E+00 | -2.38E+00 | 1.82E+00 |
| S10 | -8.41E-02 | -4.13E-01 | 1.15E+00 | -1.78E+00 | 1.90E+00 | -1.47E+00 | 8.40E-01 |
| S11 | 5.95E-02 | -2.68E-01 | 3.48E-01 | -3.01E-01 | 1.78E-01 | -7.53E-02 | 2.34E-02 |
| S12 | 1.47E-01 | -2.05E-01 | 1.84E-01 | -1.21E-01 | 5.77E-02 | -2.00E-02 | 5.07E-03 |
| S13 | -9.69E-02 | -4.55E-02 | 7.74E-02 | -4.05E-02 | 1.23E-02 | -2.48E-03 | 3.53E-04 |
| S14 | -1.39E-01 | 3.13E-02 | 5.61E-03 | -7.39E-03 | 3.06E-03 | -7.85E-04 | 1.39E-04 |
TABLE 14-1
| Flour mark | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | 8.39E+00 | -5.66E+00 | 2.73E+00 | -9.16E-01 | 2.03E-01 | -2.68E-02 | 1.59E-03 |
| S2 | 2.75E+01 | -2.36E+01 | 1.43E+01 | -5.98E+00 | 1.64E+00 | -2.67E-01 | 1.95E-02 |
| S3 | -6.69E+02 | 8.41E+02 | -7.48E+02 | 4.59E+02 | -1.86E+02 | 4.43E+01 | -4.75E+00 |
| S4 | -3.08E+03 | 4.35E+03 | -4.39E+03 | 3.08E+03 | -1.42E+03 | 3.90E+02 | -4.79E+01 |
| S5 | -3.27E+03 | 4.38E+03 | -4.16E+03 | 2.75E+03 | -1.19E+03 | 3.08E+02 | -3.56E+01 |
| S6 | -2.61E+02 | 2.95E+02 | -2.38E+02 | 1.33E+02 | -4.89E+01 | 1.06E+01 | -1.04E+00 |
| S7 | 3.39E+02 | -3.39E+02 | 2.42E+02 | -1.20E+02 | 3.96E+01 | -7.75E+00 | 6.83E-01 |
| S8 | -3.16E+01 | 2.39E+01 | -1.29E+01 | 4.81E+00 | -1.18E+00 | 1.71E-01 | -1.11E-02 |
| S9 | -1.10E+00 | 5.25E-01 | -1.89E-01 | 4.88E-02 | -8.42E-03 | 8.64E-04 | -3.95E-05 |
| S10 | -3.60E-01 | 1.14E-01 | -2.63E-02 | 4.27E-03 | -4.61E-04 | 2.96E-05 | -8.55E-07 |
| S11 | -5.43E-03 | 9.44E-04 | -1.21E-04 | 1.11E-05 | -6.89E-07 | 2.58E-08 | -4.41E-10 |
| S12 | -9.51E-04 | 1.32E-04 | -1.34E-05 | 9.68E-07 | -4.74E-08 | 1.41E-09 | -1.92E-11 |
| S13 | -3.63E-05 | 2.71E-06 | -1.45E-07 | 5.46E-09 | -1.36E-10 | 2.02E-12 | -1.34E-14 |
| S14 | -1.75E-05 | 1.60E-06 | -1.04E-07 | 4.70E-09 | -1.41E-10 | 2.50E-12 | -1.99E-14 |
TABLE 14-2
Fig. 14A shows on-axis chromatic aberration curves of an imaging lens of embodiment 7, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the imaging lens of embodiment 7. Fig. 14C 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 surface after light passes through the lens. As can be seen from fig. 14A to 14C, the imaging lens according to embodiment 7 can achieve good imaging quality.
In summary, examples 1 to 7 each satisfy the relationship shown in table 15.
Watch 15
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens described above.
The foregoing description is only exemplary of the preferred embodiments 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 (10)
1. Imaging lens, characterized in that includes in proper order along the optical axis from the thing side to image side: a first lens having a positive optical power; a second lens; a third lens; a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a fifth lens; a sixth lens element having a concave image-side surface; and a seventh lens, wherein,
the effective focal length f1 of the first lens, the effective focal length f7 of the seventh lens and the maximum half field angle Semi-FOV of the imaging lens satisfy: 8.0mm < (f 1+ | f7 |) × tan (Semi-FOV) <11.5mm;
half of the height of an image ImgH corresponding to the maximum field angle of the imaging lens, the diameter EPD of the entrance pupil of the imaging lens and the f-number Fno of the imaging lens meet the following requirements: 3.5<ImgH/EPD multiplied by Fno <5.5; and
a distance SAG51 on the optical axis between an intersection point of an object side surface of the fifth lens and the optical axis and an effective diameter vertex of an object side surface of the fifth lens, a distance SAG61 on the optical axis between an intersection point of an object side surface of the sixth lens and the optical axis and an effective diameter vertex of an object side surface of the sixth lens, and an air interval T56 on the optical axis between the fifth lens and the sixth lens satisfy: -9.0< (SAG 51+ SAG 61)/T56 < -2.5.
2. The imaging lens 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, a half ImgH of an image height corresponding to a maximum field angle of the imaging lens, and an f-number Fno of the imaging lens satisfy: 1.5 were woven ttl/ImgH × Fno <3.0.
3. The imaging lens as claimed in 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, an effective focal length f of the imaging lens, and a maximum half field angle Semi-FOV of the imaging lens satisfy: 1.0 sTTL/f × Tan (Semi-FOV) <1.5.
4. The imaging lens according to claim 1, wherein a radius of curvature R11 of an object-side surface of the sixth lens and a radius of curvature R14 of an image-side surface of the seventh lens satisfy: 0.5 sR11/R14 <2.0.
5. The imaging lens according to claim 1, wherein an effective focal length f1 of the first lens, a radius of curvature R1 of an object side surface of the first lens, and a radius of curvature R2 of an image side surface of the first lens satisfy:
2.0<(f1/R1)×(R2/f1)<4.5。
6. the imaging lens as claimed in claim 1, wherein the second lens element has a convex object-side surface and a concave image-side surface.
7. The imaging lens according to claim 1, wherein an air interval T45 on the optical axis between the fourth lens and the fifth lens, an air interval T56 on the optical axis between the fifth lens and the sixth lens, an air interval T67 on the optical axis between the sixth lens and the seventh lens, a center thickness CT5 on the optical axis between the fifth lens and a center thickness CT6 on the optical axis between the sixth lens satisfy:
0.8<(T45+T56+T67)/(CT5+CT6)<2.8。
8. the imaging lens according to claim 1, wherein an effective half aperture DT62 of an image side surface of the sixth lens and an effective half aperture DT52 of an image side surface of the fifth lens satisfy:
3.5<(DT62+DT52)/(DT62-DT52)<10.0。
9. the imaging lens according to claim 1, wherein an effective semi-aperture DT62 of an image-side surface of the sixth lens, an effective semi-aperture DT52 of an image-side surface of the fifth lens, a distance SAG52 on the optical axis between an intersection point of the image-side surface of the fifth lens and the optical axis and an effective radius vertex of the image-side surface of the fifth lens, and a distance SAG62 on the optical axis between the intersection point of the image-side surface of the sixth lens and the optical axis and the effective radius vertex of the image-side surface of the sixth lens satisfy: -8.5 sNt DT52/SAG52+ DT62/SAG62< -5.5.
10. The imaging lens according to any one of claims 1 to 9, wherein a distance SAG71 on the optical axis between an intersection point of an object-side surface of the seventh lens and the optical axis to an effective radius vertex of the object-side surface of the seventh lens, a distance SAG72 on the optical axis between an intersection point of an image-side surface of the seventh lens and the optical axis to an effective radius vertex of an image-side surface of the seventh lens, and a center thickness CT7 on the optical axis of the seventh lens satisfy:
-11.8<(SAG71+SAG72)/CT7<-2.5。
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| CN117289433B (en) * | 2023-11-23 | 2024-02-20 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
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