CN116338902A - Imaging lens - Google Patents
Imaging lens Download PDFInfo
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- CN116338902A CN116338902A CN202310319971.1A CN202310319971A CN116338902A CN 116338902 A CN116338902 A CN 116338902A CN 202310319971 A CN202310319971 A CN 202310319971A CN 116338902 A CN116338902 A CN 116338902A
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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
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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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Abstract
The application discloses imaging lens, this imaging lens includes along the optical axis from the thing side to the image side in proper order: a first lens having positive optical power; a second lens; a third lens element with a concave image-side surface; a fourth lens element with a convex image-side surface; a fifth lens; a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; and a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface, wherein the center thickness CT4 of the fourth lens element on the optical axis, the air space T45 between the fourth lens element and the fifth lens element on the optical axis, half of the diagonal length of the effective pixel area of the imaging lens element, and the distance BFL between the image-side surface of the seventh lens element and the imaging surface of the imaging lens element on the optical axis satisfy the following conditions: 2.0< CT4/T45<9.0 and 1.5< ImgH/BFL <3.0.
Description
Technical Field
The present application relates to the field of optical elements, and in particular, to an imaging lens.
Background
The length of the lens has been an important factor limiting the imaging quality of the lens, however, the thickness of the smart phone has limited the lens not to be too long, which makes the performance of the lens not fully available. The birth of the telescopic lens breaks through the restriction of the optical design of the existing smart phone, and obviously improves the imaging quality. The telescopic lens is in an extending state in a working state, the lens protrudes out of the surface of the rear shell of the mobile phone, and the lens has a longer length at the moment and can fully exert high performance; in the non-working state, the lens is in a contracted state, the lens does not protrude out of the surface of the back shell of the mobile phone, and the mobile phone does not bring inconvenience when using other functions.
The telescopic lens generally needs to have a longer optical back focus so as to realize the telescopic function of the lens, but under the mainstream trend of miniaturization, the improvement of the performance and the reduction of the size of the image sensor also lead to the design freedom of the corresponding lens to be smaller and smaller, the design difficulty of the lens is increased, and the contradiction between pursuing a large image plane and shortening the total length of the lens always exists, so that the seven-piece imaging lens which has a longer optical back focus and a large image plane and can realize the telescopic function of the lens is designed, and the seven-piece imaging lens has important practical significance.
Disclosure of Invention
The application provides such imaging lens, this imaging lens includes in proper order from the thing side to the image side along the optical axis: a first lens having positive optical power; a second lens; a third lens element with a concave image-side surface; a fourth lens element with a convex image-side surface; a fifth lens; a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; and a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface, wherein the center thickness CT4 of the fourth lens element on the optical axis, the air space T45 between the fourth lens element and the fifth lens element on the optical axis, half of the diagonal length of the effective pixel area of the imaging lens element, and the distance BFL between the image-side surface of the seventh lens element and the imaging surface of the imaging lens element on the optical axis satisfy the following conditions: 2.0< CT4/T45<9.0 and 1.5< ImgH/BFL <3.0.
In one embodiment, at least one of the second lens and the third lens has negative power, and at least one of the fourth lens and the fifth lens has negative power.
In one embodiment, the distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area of the imaging lens satisfy: 1.0< TTL/ImgH <2.0.
In one embodiment, the center thickness CT4 of the fourth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 5.0< (CT4+CT5+CT6)/CT 7<12.5.
In one embodiment, the effective focal length f of the imaging lens and half of the maximum field angle Semi-FOV of the imaging lens satisfy: 7.5< f/tan (Semi-FOV) <11.0.
In one embodiment, the effective focal length f of the imaging lens, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 0.5< f/(f6+|f7|) <1.5.
In one embodiment, the effective focal length f6 of the sixth lens, 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: 0< f 6/(R11-R12) <1.0.
In one embodiment, the effective focal length f7 of the seventh lens, the radius of curvature R13 of the object-side surface of the seventh lens, and the radius of curvature R14 of the image-side surface of the seventh lens satisfy: 0.5< f 7/(R13+R14) <2.5.
In one embodiment, the radius of curvature R13 of the object side surface of the seventh lens and the radius of curvature R14 of the image side surface of the seventh lens satisfy: 0< (R13+R14)/(R13-R14) <0.8.
In one embodiment, the radius of curvature R1 of the object side surface of the first lens, the radius of curvature R4 of the image side surface of the second lens, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 5.0< (R1+R4)/(Ct1+Ct2) <9.0.
In one embodiment, the effective half-aperture DT41 of the object-side surface of the fourth lens element, the effective half-aperture DT42 of the image-side surface of the fourth lens element, and the effective half-aperture DT51 of the object-side surface of the fifth lens element satisfy: 1.0< (DT 41+DT 42)/DT 51<2.0.
In one embodiment, the edge thickness ET4 at the maximum effective radius of the fourth lens, the edge thickness ET6 at the maximum effective radius of the sixth lens, and the edge thickness ET7 at the maximum effective radius of the seventh lens satisfy: 0< (ET 4+ ET 6)/ET 7<7.0.
In one embodiment, the distance SAG71 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, and the distance SAG72 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 satisfy: -0.1< (SAG 71-SAG 72)/(sag71+sag72) <1.0.
The seven-piece imaging lens has the characteristics of good imaging quality, long back focus and large image surface, can realize the telescopic function of the lens, reasonably designs the surface shape of the lens, the focal power, the thickness of the fourth lens and the interval distribution of the fourth lens and the fifth lens, is favorable for balancing aberration and spherical aberration, improves the lens resolving power, simultaneously is favorable for improving the stability of lens assembly, reasonably designs the image height and optical back focus of the imaging lens, ensures that the lens has a sufficiently large imaging area, and simultaneously enables the lens to have longer optical back focus so as to realize the telescopic function of the lens.
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, in which:
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, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 1;
fig. 3 shows a schematic structural view of an imaging lens according to embodiment 2 of the present application;
fig. 4A to 4C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 2;
Fig. 5 shows a schematic structural view of an imaging lens according to embodiment 3 of the present application;
fig. 6A to 6C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 3;
fig. 7 shows a schematic structural diagram of an imaging lens according to embodiment 4 of the present application;
fig. 8A to 8C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 4;
fig. 9 shows a schematic structural view of an imaging lens according to embodiment 5 of the present application;
fig. 10A to 10C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 5;
fig. 11 shows a schematic structural view of an imaging lens according to embodiment 6 of the present application;
fig. 12A to 12C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the imaging lens of embodiment 6;
fig. 13 shows a schematic structural view of an imaging lens according to embodiment 7 of the present application; and
fig. 14A to 14C show an on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the imaging lens of embodiment 7, respectively.
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 these detailed description are merely illustrative of exemplary embodiments of the application and are 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 present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The imaging lens according to the exemplary embodiment of the present application may include seven lenses having optical power, 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, arranged in order from an object side to an image side along an optical axis. 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 element has positive optical power, the sixth lens element has positive optical power, the object-side surface thereof is convex, the image-side surface thereof is convex, the seventh lens element has negative optical power, the object-side surface thereof is concave, and the image-side surface thereof is concave.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 2.0< CT4/T45<9.0, wherein CT4 is the center thickness of the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.5< ImgH/BFL <3.0, wherein ImgH is half the diagonal length of the effective pixel area of the imaging lens, and BFL is the distance on the optical axis from the image side of the seventh lens to the imaging surface of the imaging lens.
The imaging lens according to the exemplary embodiment of the present application may include seven lenses having optical power, 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, arranged in order from an object side to an image side along an optical axis. The first lens element has positive refractive power, the sixth lens element has positive refractive power, the object-side surface thereof is convex, the image-side surface thereof is convex, the seventh lens element has negative refractive power, the object-side surface thereof is concave, and the image-side surface thereof is concave. The center thickness CT4 of the fourth lens on the optical axis, the air interval T45 of the fourth lens and the fifth lens on the optical axis, half ImgH of the diagonal length of the effective pixel area of the imaging lens, and the distance BFL from the image side surface of the seventh lens to the imaging surface of the imaging lens on the optical axis are set to satisfy the following conditions: 2.0< CT4/T45<9.0 and 1.5< ImgH/BFL <3.0, the thickness and interval distribution of the fourth lens and the fifth lens can be more reasonable by controlling the ratio of the center thickness of the reasonably designed part of lens to the air interval of the fourth lens and the fifth lens on the optical axis within a certain range, thereby being beneficial to balancing aberration, improving the resolution of the lens and improving the stability of lens assembly; the ratio of half of the image height of the imaging lens to the distance from the image side surface of the seventh lens to the imaging surface on the optical axis is controlled within a certain range, so that the lens has a longer optical back focus while a large enough imaging area is ensured, and the telescopic function of the lens is realized. The seven-piece imaging lens provided by the application has the characteristics of good imaging quality, long back focus and large image surface.
In an exemplary embodiment, at least one lens of the second lens and the third lens has negative focal power, and at least one lens of the fourth lens and the fifth lens has negative focal power, so that the focal power distribution of the lens is more reasonable, aberration can be effectively balanced, and the resolution of the lens is improved.
In an exemplary embodiment, the imaging lens of the present application may further include a diaphragm disposed at an object side surface of the first lens.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.0< TTL/ImgH <2.0, 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, and ImgH is half of the diagonal length of the effective pixel area of the imaging lens. The ratio of the distance from the object side surface to the imaging surface of the first lens on the optical axis to half of the image height is controlled within a certain range, so that the optical total length of the lens is not too long while the enough imaging area of the lens is ensured, and the miniaturization of the lens is facilitated.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 5.0< (CT4+CT5+CT6)/CT 7<12.5, wherein CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis. The ratio of the sum of the center thicknesses of the fourth lens, the fifth lens and the sixth lens to the center thickness of the seventh lens is controlled within a certain range, so that the thickness distribution of the lenses of the fourth lens, the fifth lens, the sixth lens and the seventh lens is more reasonable, the aberration is balanced, the lens resolution is improved, and meanwhile, the stability of lens assembly is improved.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 7.5< f/tan (Semi-FOV) <11.0, where f is the effective focal length of the imaging lens and Semi-FOV is half of the maximum field angle of the imaging lens. The ratio of the effective focal length of the imaging lens to the tangent value of half of the maximum field angle of the imaging lens is controlled within a certain range, the field angle and focal length of the imaging lens are ensured to be within the optimal range, and the imaging lens is facilitated to obtain large image plane characteristics to obtain enough back focus, so that the parameters of the imaging lens meet basic requirements.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.5< f/(f6+|f7|) <1.5, where f is the effective focal length of the imaging lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. The optical power distribution of the lens can be more reasonable, aberration can be better balanced, and the system resolution can be improved.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0< f 6/(R11-R12) <1.0, wherein f6 is the effective focal length of the sixth lens element, R11 is the radius of curvature of the object-side surface of the sixth lens element, and R12 is the radius of curvature of the image-side surface of the sixth lens element. The ratio of the effective focal length of the sixth lens to the difference between the radius of curvature of the object side surface of the sixth lens and the radius of curvature of the image side surface of the sixth lens is controlled within a certain range, so that the focal power and the shape of the sixth lens are more reasonable, the aberration can be balanced, the lens resolution can be improved, and the machinability of the sixth lens can be improved.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0.5< f 7/(r13+r14) <2.5, where f7 is the effective focal length of the seventh lens element, R13 is the radius of curvature of the object-side surface of the seventh lens element, and R14 is the radius of curvature of the image-side surface of the seventh lens element. The ratio of the effective focal length of the seventh lens to the sum of the radius of curvature of the object side surface of the seventh lens and the radius of curvature of the image side surface of the seventh lens is controlled within a certain range, so that the focal power and the shape of the seventh lens are more reasonable, the balance of aberration is facilitated, the lens resolution is improved, and the machinability of the seventh lens is facilitated to be improved.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0< (R13+R14)/(R13-R14) <0.8, wherein R13 is the radius of curvature of the object side surface of the seventh lens element and R14 is the radius of curvature of the image side surface of the seventh lens element. Satisfying 0< (R13+R14)/(R13-R14) <0.8, the shape of the seventh lens can be more reasonable, the total reflection ghost of the seventh lens is avoided, and the processability of the seventh lens is facilitated.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 5.0< (R1+R4)/(C1+C2) <9.0, wherein R1 is the radius of curvature of the object side of the first lens, R4 is the radius of curvature of the image side of the second lens, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. The ratio of the sum of the curvature radius of the object side surface of the first lens to the curvature radius of the image side surface of the second lens to the sum of the center thickness of the first lens and the center thickness of the second lens is controlled within a certain range, so that the thickness distribution and the shape of the first lens and the second lens are more reasonable, the balance of aberration is facilitated, the lens resolution is improved, and meanwhile, the stability of lens assembly is improved.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 1.0< (DT 41+DT 42)/DT 51<2.0, where DT41 is the effective half-aperture of the object-side surface of the fourth lens element, DT42 is the effective half-aperture of the image-side surface of the fourth lens element, and DT51 is the effective half-aperture of the object-side surface of the fifth lens element. The ratio of the sum of the effective half aperture of the object side surface of the fourth lens and the effective half aperture of the image side surface of the fourth lens to the effective half aperture of the object side surface of the fifth lens is controlled within a certain range, so that the effective diameters of the fourth lens and the fifth lens are not excessively large, and the miniaturization of the whole lens is facilitated.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: 0< (ET 4+ ET 6)/ET 7<7.0, wherein ET4 is the edge thickness at the maximum effective radius of the fourth lens, ET6 is the edge thickness at the maximum effective radius of the sixth lens, and ET7 is the edge thickness at the maximum effective radius of the seventh lens. The ratio of the sum of the edge thickness at the maximum effective radius of the fourth lens and the edge thickness at the maximum effective radius of the sixth lens to the edge thickness at the maximum effective radius of the seventh lens is controlled within a certain range, so that the edge thickness distribution of the fourth lens, the sixth lens and the seventh lens is more reasonable, the processability of the lenses is improved, and the post assembly of the lenses is facilitated.
In an exemplary embodiment, an imaging lens according to the present application may satisfy: -0.1< (SAG 71-SAG 72)/(SAG 71+ SAG 72) <1.0, wherein SAG71 is the distance on the optical axis between the intersection of the object side surface of the seventh lens and the optical axis and the vertex of the effective radius of the object side surface of the seventh lens, and SAG72 is the distance on the optical axis between the intersection of the image side surface of the seventh lens and the optical axis and the vertex of the effective radius of the image side surface of the seventh lens. Satisfying-0.1 < (SAG 71-SAG 72)/(SAG71+SAG72) <1.0, controlling the sagittal height of the object side and the sagittal height of the image side of the seventh lens within a certain range can make the shape of the seventh lens more reasonable, avoid excessive bending of the lens, and improve the workability of the seventh lens.
In an exemplary embodiment, at least one of the mirrors of each of the first to seventh lenses is an aspherical mirror. The present application is not particularly limited to the specific number of spherical lenses and aspherical lenses, and the lenses may each use an aspherical lens if focus is on annotating image quality. The aspherical 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 of the lens to the periphery. The aspheric lens has better curvature radius characteristic and has the advantages of improving distortion aberration and astigmatism aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, the object side surface and the image side surface of each of the first lens to the seventh lens are aspherical mirror surfaces.
In an exemplary embodiment, the effective focal length f of the imaging lens may be, for example, in the range of 6.7mm to 8.8mm, the effective focal length f1 of the first lens may be, for example, in the range of 7.9mm to 25.8mm, the effective focal length f2 of the second lens may be, for example, in the range of-25.8 mm and 30.3mm, the effective focal length f3 of the third lens may be, for example, in the range of-35.1 mm to 55.1mm, the effective focal length f4 of the fourth lens may be, for example, in the range of-22.5 mm to 37.1mm, the effective focal length f5 of the fifth lens may be, for example, in the range of-256.0 mm to 272.0mm, the effective focal length f6 of the sixth lens may be, for example, in the range of 3.6mm to 4.5mm, the effective focal length f7 of the seventh lens may be, for example, in the range of-4.6 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 may satisfy 8.9mm < TTL <10.9mm. The maximum half field angle Semi-FOV of the imaging lens may be, for example, in the range of 37.1 ° to 40.2 °. Half the diagonal length ImgH of the effective pixel region of the imaging lens may be, for example, in the range of 5.7mm to 7.0 mm.
In an exemplary embodiment, the 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 surface, high pixels, miniaturization, high imaging quality and the like. The imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the seven lenses 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 of each lens, incident light rays can be effectively converged, the optical total length of the imaging lens is reduced, and the processability of the imaging lens is improved, so that 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 making up the imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the technical solutions claimed herein. For example, although seven lenses are described as an example 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 the imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying 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 sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17. The first lens element E1 has positive 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 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 negative 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 positive 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 negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. 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 convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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 effective focal length f of the imaging lens is 8.73mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens on the optical axis is 10.74mm, the half of the diagonal length ImgH of the effective pixel area of the imaging lens is 6.93mm, the maximum half field angle Semi-FOV of the imaging lens is 39.09 °, and the f-number Fno of the imaging lens is 1.94.
Table 1 shows the basic parameter table of the imaging lens of embodiment 1, in which the unit of the radius of curvature, thickness, and effective focal length are all millimeters (mm).
TABLE 1
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 surfaces. The profile x of each aspherical lens can be defined using, 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 tables 2-1 and 2-2 give the higher order coefficients A that can be used for each of the aspherical mirror faces S1-S14 in example 1 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 。
TABLE 2-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -3.40E-05 | -2.22E-05 | -5.62E-06 | 1.02E-05 | 6.20E-06 | -4.25E-06 | 4.73E-07 |
| S2 | -2.57E-05 | 9.66E-06 | -2.39E-05 | 9.04E-06 | 9.01E-06 | 3.21E-06 | -9.49E-06 |
| S3 | -1.03E-05 | -1.79E-05 | 9.14E-06 | -1.03E-05 | 8.04E-06 | -1.56E-06 | -1.13E-08 |
| S4 | 2.64E-06 | -2.10E-05 | 7.70E-06 | -3.12E-06 | 9.55E-06 | -2.74E-06 | -1.73E-06 |
| S5 | -1.79E-05 | 3.93E-06 | -2.07E-06 | 1.08E-07 | -1.66E-06 | -1.49E-06 | 9.54E-07 |
| S6 | -6.11E-05 | 4.14E-05 | 5.31E-06 | 8.10E-06 | -6.93E-07 | 1.44E-06 | -2.61E-06 |
| S7 | -2.29E-04 | 4.63E-05 | 1.53E-05 | -9.40E-06 | -3.23E-05 | -1.93E-05 | -1.18E-05 |
| S8 | -7.50E-04 | -5.10E-04 | -3.57E-04 | -1.39E-04 | -1.04E-04 | -3.03E-05 | -2.10E-05 |
| S9 | -8.12E-03 | 4.89E-03 | -2.87E-03 | 2.01E-03 | -1.89E-03 | 7.12E-04 | -1.43E-03 |
| S10 | 6.72E-03 | 1.57E-04 | -6.03E-04 | -4.62E-04 | 2.37E-04 | -7.95E-06 | -1.66E-05 |
| S11 | 2.11E-03 | 4.61E-04 | -9.69E-04 | -4.47E-04 | 1.87E-04 | -4.67E-05 | 4.13E-05 |
| S12 | -4.97E-03 | 2.47E-03 | -6.14E-04 | -2.45E-04 | 1.38E-04 | -4.66E-04 | 2.78E-05 |
| S13 | -9.61E-03 | 1.42E-03 | 8.52E-04 | -5.47E-04 | -4.91E-04 | 4.21E-04 | -2.10E-04 |
| S14 | 1.14E-04 | -2.68E-03 | -1.22E-03 | 2.19E-04 | 2.17E-04 | -2.43E-04 | -3.65E-04 |
TABLE 2-2
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2C shows a magnification chromatic aberration curve of the imaging lens of embodiment 1, which represents the 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 provided in 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, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic structural diagram of an imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the imaging lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17. The first lens element E1 has positive 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 negative 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 positive 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 negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. 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 convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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 effective focal length f of the imaging lens is 8.42mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens on the optical axis is 10.85mm, the half of the diagonal length ImgH of the effective pixel area of the imaging lens is 6.93mm, the maximum half field angle Semi-FOV is 39.36 °, and the f-number Fno is 1.88.
Table 3 shows the 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 the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 3 Table 3
TABLE 4-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -6.10E-05 | -3.31E-05 | 1.08E-05 | 2.37E-05 | 1.33E-05 | -1.40E-05 | 2.09E-06 |
| S2 | 7.58E-05 | -4.59E-05 | 6.41E-05 | 3.24E-05 | 5.31E-05 | -1.07E-05 | -1.43E-05 |
| S3 | -1.39E-06 | -4.38E-05 | 8.94E-05 | 1.95E-07 | 4.53E-05 | 4.64E-06 | 5.49E-06 |
| S4 | -3.92E-04 | -1.92E-04 | -3.55E-05 | 3.54E-05 | 5.62E-05 | 3.26E-05 | 1.18E-05 |
| S5 | -9.81E-05 | -7.20E-06 | 1.46E-05 | 1.13E-05 | -1.71E-06 | -5.58E-06 | 7.59E-07 |
| S6 | -3.36E-04 | 5.37E-05 | 1.46E-05 | 2.18E-05 | -3.73E-06 | 2.91E-06 | 1.81E-06 |
| S7 | -7.17E-04 | -9.62E-05 | 4.59E-05 | 2.66E-05 | -2.77E-05 | -3.90E-05 | -2.32E-05 |
| S8 | -1.46E-04 | 1.25E-04 | -1.75E-04 | 6.81E-06 | -6.18E-05 | -6.26E-06 | -8.43E-06 |
| S9 | -4.79E-03 | 2.04E-03 | -1.73E-03 | 9.94E-04 | -7.27E-04 | 3.61E-04 | -4.27E-04 |
| S10 | 4.55E-04 | 1.09E-03 | -8.78E-05 | 2.44E-05 | -2.05E-04 | 1.00E-04 | -1.46E-05 |
| S11 | 7.59E-04 | 1.66E-03 | 1.60E-04 | -3.82E-04 | -1.71E-04 | -2.57E-05 | 8.17E-05 |
| S12 | -4.21E-03 | 3.06E-03 | -1.12E-03 | 2.21E-04 | 3.11E-04 | -2.06E-04 | 1.12E-05 |
| S13 | -4.44E-03 | -2.07E-03 | 2.35E-03 | -7.96E-04 | -2.61E-04 | 3.52E-04 | -9.84E-05 |
| S14 | 2.50E-03 | -7.46E-04 | -2.92E-04 | -7.39E-04 | 4.13E-04 | -6.32E-06 | -1.68E-05 |
TABLE 4-2
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4C shows a magnification chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4C, the imaging lens provided in 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 structural diagram of an imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17. The first lens element E1 has positive 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 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 concave. The fourth lens element E4 has positive 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 negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. 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 convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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 effective focal length f of the imaging lens is 8.62mm, the distance TTL 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 10.84mm, the half of the diagonal length ImgH of the effective pixel area of the imaging lens is 6.93mm, the maximum half field angle Semi-FOV is 39.57 °, and the f-number Fno is 1.90.
Table 5 shows the basic parameter table of the imaging lens of embodiment 3, in which the unit of the radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 6-1 and 6-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 5
TABLE 6-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -3.53E-05 | -1.94E-05 | -5.38E-06 | 1.34E-05 | 1.99E-05 | -7.28E-06 | -1.63E-06 |
| S2 | 5.14E-05 | -5.58E-05 | -4.34E-06 | -2.48E-05 | 2.58E-05 | 1.17E-05 | -8.08E-06 |
| S3 | 9.57E-05 | -5.62E-05 | 5.36E-05 | -3.47E-05 | 1.85E-05 | -6.20E-06 | 7.57E-07 |
| S4 | 4.19E-05 | -2.56E-05 | 6.27E-06 | -2.22E-05 | 4.83E-06 | 4.07E-06 | -9.63E-07 |
| S5 | -4.78E-05 | -2.67E-05 | -7.95E-06 | 5.92E-06 | 4.59E-06 | -2.04E-06 | 1.77E-07 |
| S6 | -4.16E-05 | -3.05E-05 | 8.33E-06 | 2.05E-06 | 6.77E-06 | -5.13E-06 | 9.42E-07 |
| S7 | -7.44E-05 | -6.65E-05 | -1.16E-05 | 1.73E-06 | 1.38E-05 | -2.25E-06 | -6.23E-07 |
| S8 | 2.92E-04 | 1.39E-05 | 1.73E-05 | -4.25E-05 | -4.09E-05 | -1.72E-06 | 2.36E-06 |
| S9 | -7.48E-03 | 3.01E-03 | -2.44E-03 | 1.67E-03 | -1.56E-03 | 6.59E-04 | -1.23E-03 |
| S10 | 5.76E-03 | -1.15E-03 | 7.82E-04 | -8.10E-04 | 2.76E-04 | -7.68E-05 | -7.40E-06 |
| S11 | 2.69E-03 | 1.24E-03 | -1.99E-05 | 4.23E-05 | 5.43E-05 | 5.18E-05 | -2.43E-05 |
| S12 | -7.58E-03 | -1.22E-03 | 1.30E-03 | 2.39E-04 | -3.89E-04 | 8.28E-05 | 7.43E-06 |
| S13 | 4.58E-03 | -3.85E-03 | 9.99E-04 | 7.55E-04 | -5.75E-04 | -3.97E-05 | 1.12E-04 |
| S14 | 4.35E-03 | -2.65E-03 | -2.06E-04 | -1.56E-03 | 1.43E-04 | 2.80E-04 | 2.40E-04 |
TABLE 6-2
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6C shows a magnification chromatic aberration curve of the imaging lens of embodiment 3, which represents the 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 provided in 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 structural diagram of an imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17. The first lens element E1 has positive 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 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 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 negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. 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 convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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 effective focal length f of the imaging lens is 8.62mm, the distance TTL 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 10.73mm, the half of the diagonal length ImgH of the effective pixel area of the imaging lens is 6.93mm, the maximum half field angle Semi-FOV is 39.47 °, and the f-number Fno is 1.85.
Table 7 shows a basic parameter table of the imaging lens of embodiment 4, in which the unit of the radius of curvature, thickness, and effective focal length are each millimeters (mm). Tables 8-1 and 8-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 7
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.19E-02 | -6.30E-03 | -4.53E-03 | -1.75E-03 | -6.13E-04 | -9.72E-05 | -7.25E-05 |
| S2 | -5.25E-02 | 1.04E-03 | -4.87E-03 | 7.78E-04 | -8.84E-04 | 9.67E-07 | -2.99E-04 |
| S3 | -1.83E-01 | 4.71E-02 | 2.36E-03 | 1.59E-03 | -1.21E-03 | -1.73E-04 | -3.42E-04 |
| S4 | -2.67E-01 | 5.63E-02 | 1.00E-02 | 3.58E-03 | 2.84E-04 | -8.99E-05 | -2.58E-04 |
| S5 | -1.19E-01 | 5.50E-03 | 1.53E-02 | 3.44E-03 | 2.71E-04 | -2.90E-04 | -4.93E-05 |
| S6 | -2.09E-01 | -9.84E-03 | 8.10E-03 | 2.87E-03 | 8.47E-04 | -5.05E-05 | -8.79E-05 |
| S7 | -2.66E-01 | -5.00E-03 | 6.80E-03 | 3.10E-03 | 1.23E-03 | -5.56E-06 | -1.65E-04 |
| S8 | -6.57E-01 | 7.34E-02 | 1.73E-02 | 1.11E-02 | 3.52E-03 | 1.63E-03 | -6.78E-05 |
| S9 | -3.74E-01 | -2.83E-01 | 1.10E-01 | -3.41E-02 | 5.35E-02 | -1.61E-02 | 3.30E-03 |
| S10 | -2.96E+00 | 5.14E-01 | -1.23E-01 | 5.33E-02 | -3.23E-03 | 6.12E-04 | -1.00E-02 |
| S11 | -1.35E+00 | -6.07E-03 | 9.59E-03 | 6.49E-02 | -2.04E-02 | -8.15E-04 | 8.73E-03 |
| S12 | 2.03E+00 | -5.42E-01 | 3.86E-02 | 3.40E-02 | -2.50E-02 | -6.67E-03 | 1.77E-02 |
| S13 | 8.58E-01 | 4.91E-01 | -3.41E-01 | 1.32E-01 | 2.73E-03 | -1.24E-02 | 1.47E-03 |
| S14 | -6.44E+00 | 8.75E-01 | -4.09E-01 | 9.07E-02 | -3.08E-02 | 3.30E-02 | -7.07E-03 |
TABLE 8-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -1.87E-05 | -1.59E-05 | 2.65E-05 | 1.64E-05 | 1.74E-05 | -1.87E-05 | 2.93E-06 |
| S2 | 2.68E-05 | -8.25E-05 | 2.87E-05 | 1.03E-05 | 4.99E-05 | -1.19E-05 | -5.10E-06 |
| S3 | 1.17E-04 | -4.14E-05 | 6.27E-05 | -3.23E-05 | 2.45E-05 | -1.04E-05 | 1.26E-06 |
| S4 | -8.35E-05 | -8.60E-05 | -2.31E-07 | 9.36E-06 | 4.61E-05 | 2.17E-05 | 4.58E-06 |
| S5 | -4.19E-05 | 3.82E-05 | 3.26E-05 | 2.54E-05 | -1.92E-05 | -1.57E-05 | -8.81E-06 |
| S6 | -1.51E-04 | -5.06E-05 | -1.12E-05 | 1.93E-05 | 2.86E-06 | -4.85E-07 | -7.06E-07 |
| S7 | -1.46E-04 | -5.64E-05 | -1.07E-05 | 1.02E-05 | -3.59E-06 | -1.43E-05 | -1.31E-05 |
| S8 | 2.30E-04 | -9.27E-05 | 8.16E-07 | -4.98E-05 | -4.37E-05 | -1.57E-05 | -2.03E-05 |
| S9 | -9.30E-03 | 4.07E-03 | -3.11E-03 | 2.01E-03 | -1.93E-03 | 7.63E-04 | -1.50E-03 |
| S10 | 7.04E-03 | -2.03E-03 | -7.10E-05 | -2.85E-04 | 4.54E-04 | -2.18E-04 | 1.35E-05 |
| S11 | 5.84E-03 | -4.46E-03 | -3.57E-03 | -2.90E-04 | 6.86E-04 | 2.72E-04 | -5.50E-06 |
| S12 | 3.62E-03 | -1.38E-03 | -9.53E-05 | -2.85E-05 | -4.09E-04 | -2.23E-05 | 2.38E-05 |
| S13 | 2.29E-03 | -2.88E-03 | 3.04E-04 | 5.57E-04 | 8.09E-05 | -1.04E-04 | 3.07E-06 |
| S14 | 4.66E-03 | -5.52E-04 | 8.14E-04 | -1.52E-03 | -2.54E-04 | -6.00E-06 | 9.60E-05 |
TABLE 8-2
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8C shows a magnification chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8C, the imaging lens provided in 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 structural diagram of an imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the imaging lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17. The first lens element E1 has positive 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 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 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 concave. 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 convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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 effective focal length f of the imaging lens is 8.68mm, the distance TTL 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 10.68mm, the half of the diagonal length ImgH of the effective pixel area of the imaging lens is 6.93mm, the maximum half field angle Semi-FOV is 39.39 °, and the f-number Fno is 1.88.
Table 9 shows a basic parameter table of the imaging lens of embodiment 5, in which the unit of radius of curvature, thickness, and effective focal length are all millimeters (mm). Tables 10-1 and 10-2 show the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 9
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 5.59E-03 | -6.00E-03 | -3.37E-03 | -1.51E-03 | -5.62E-04 | -2.01E-04 | -8.40E-05 |
| S2 | -8.23E-02 | 3.28E-03 | -3.95E-03 | -4.34E-04 | -3.64E-04 | -2.13E-04 | -2.42E-05 |
| S3 | -1.51E-01 | 4.08E-02 | 5.80E-04 | 4.98E-04 | -4.36E-04 | -1.58E-04 | -9.29E-05 |
| S4 | -2.99E-01 | 4.54E-02 | 4.96E-03 | 3.10E-03 | 4.36E-04 | 6.49E-05 | -9.19E-05 |
| S5 | -1.16E-01 | -6.27E-03 | 7.82E-03 | 3.50E-03 | 7.59E-04 | -1.01E-04 | -4.02E-05 |
| S6 | -2.00E-01 | -3.41E-03 | 2.50E-03 | 2.07E-03 | 4.84E-04 | -8.71E-05 | -5.65E-05 |
| S7 | -2.97E-01 | -3.13E-04 | 1.90E-03 | 2.26E-03 | 1.48E-03 | 4.16E-04 | 4.03E-05 |
| S8 | -6.43E-01 | 5.89E-02 | 6.74E-04 | 9.48E-03 | 2.70E-03 | 1.68E-03 | -1.22E-05 |
| S9 | -3.55E-01 | -2.53E-01 | 7.92E-02 | -3.75E-02 | 4.84E-02 | -1.33E-02 | 5.66E-03 |
| S10 | -2.80E+00 | 4.02E-01 | -1.12E-01 | 2.88E-02 | -3.82E-03 | 7.12E-03 | -1.02E-02 |
| S11 | -1.30E+00 | -1.17E-01 | -2.95E-03 | 7.83E-02 | -2.67E-02 | -9.33E-03 | 9.53E-03 |
| S12 | 2.05E+00 | -4.47E-01 | 4.38E-02 | 6.17E-02 | -3.78E-02 | 4.27E-03 | 2.91E-02 |
| S13 | 1.20E+00 | 5.15E-01 | -3.48E-01 | 1.33E-01 | 2.69E-03 | -1.29E-02 | 6.77E-03 |
| S14 | -6.23E+00 | 9.10E-01 | -3.26E-01 | 9.09E-02 | -3.33E-02 | 2.59E-02 | 1.52E-03 |
TABLE 10-1
TABLE 10-2
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10C shows a magnification chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10C, the imaging lens provided in 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 structural diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the imaging lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17. The first lens element E1 has positive 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 negative 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 positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. 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 convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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 effective focal length f of the imaging lens is 8.22mm, the distance TTL 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 10.84mm, the half of the diagonal length ImgH of the effective pixel area of the imaging lens is 6.20mm, the maximum half field angle Semi-FOV is 37.20 °, and the f-number Fno is 1.89.
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 higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 11
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.45E-02 | 3.35E-03 | -3.09E-03 | -8.99E-04 | 4.65E-04 | 2.52E-04 | -1.33E-04 |
| S2 | -2.41E-01 | 3.50E-02 | -8.83E-03 | 1.70E-03 | -1.43E-03 | 4.51E-04 | -7.70E-05 |
| S3 | -2.45E-01 | 7.04E-02 | -4.42E-03 | 5.18E-03 | -3.61E-03 | 1.43E-03 | -7.75E-04 |
| S4 | -1.97E-01 | 4.61E-02 | 8.80E-03 | 5.45E-03 | -5.52E-04 | 1.02E-03 | 7.51E-06 |
| S5 | -2.85E-01 | 2.37E-02 | -2.31E-04 | 3.65E-03 | 2.95E-04 | 8.23E-04 | 1.07E-04 |
| S6 | -3.34E-02 | -2.10E-02 | 1.64E-02 | -1.84E-03 | 2.44E-03 | -7.35E-04 | 1.80E-04 |
| S7 | -2.72E-01 | 1.64E-02 | 1.38E-02 | 8.07E-03 | 2.50E-04 | -6.69E-04 | -9.80E-04 |
| S8 | -5.16E-01 | 2.44E-02 | 1.65E-02 | 1.34E-02 | 4.16E-03 | 1.72E-03 | -4.01E-04 |
| S9 | -3.75E-01 | -2.51E-01 | 5.88E-02 | -2.03E-02 | 3.47E-02 | -7.37E-03 | 4.89E-03 |
| S10 | -3.05E+00 | 4.87E-01 | -1.08E-01 | 3.76E-02 | -8.82E-03 | 9.44E-03 | -8.16E-03 |
| S11 | -1.62E+00 | -1.62E-01 | 1.49E-01 | 2.87E-02 | -2.25E-02 | -4.42E-03 | -9.53E-04 |
| S12 | 1.91E+00 | -4.50E-01 | 2.41E-01 | -6.40E-02 | -3.21E-03 | 6.90E-03 | -1.84E-03 |
| S13 | 1.07E+00 | 5.84E-01 | -3.50E-01 | 1.30E-01 | -8.26E-03 | -7.64E-03 | 8.96E-03 |
| S14 | -6.29E+00 | 1.05E+00 | -4.10E-01 | 8.00E-02 | -4.64E-02 | 3.10E-02 | -2.97E-03 |
TABLE 12-1
TABLE 12-2
Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12C shows a magnification chromatic aberration curve of the imaging lens of embodiment 6, which represents the 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 provided in 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 structural diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the imaging lens sequentially includes, from an object side to an image side: stop STO, first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, seventh lens E7, filter E8, and imaging plane S17. The first lens element E1 has positive 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 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 concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. 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 convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 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 effective focal length f of the imaging lens is 6.78mm, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S17 of the imaging lens on the optical axis is 8.93mm, the half of the diagonal length ImgH of the effective pixel area of the imaging lens is 5.80mm, the maximum half field angle Semi-FOV is 40.11 °, and the f-number Fno is 1.89.
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 higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface profiles can be defined by the formula (1) given in example 1 above.
TABLE 13
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 5.28E-02 | -2.18E-03 | 6.26E-04 | -5.06E-04 | 2.59E-04 | -2.89E-04 | 1.09E-04 |
| S2 | -1.46E-01 | 2.14E-02 | -9.41E-03 | 4.30E-03 | -2.62E-03 | 5.68E-05 | 2.08E-04 |
| S3 | -1.49E-01 | 5.44E-02 | -2.30E-02 | 1.18E-02 | -6.80E-03 | 2.38E-03 | -7.73E-04 |
| S4 | -1.65E-01 | 4.86E-02 | -2.08E-02 | 1.12E-02 | -5.69E-03 | 2.42E-03 | -8.74E-04 |
| S5 | -7.90E-02 | -2.01E-02 | 6.38E-03 | -1.01E-03 | 3.38E-04 | -6.56E-04 | 3.92E-04 |
| S6 | -1.99E-02 | -5.77E-03 | 2.41E-03 | -5.09E-03 | -1.65E-03 | -1.77E-03 | -5.91E-04 |
| S7 | -2.34E-01 | -1.35E-02 | -7.63E-03 | -4.49E-03 | -2.94E-03 | -2.14E-03 | -1.58E-03 |
| S8 | -2.20E-01 | -5.81E-03 | 5.06E-03 | 1.89E-03 | 2.22E-03 | 2.08E-03 | 8.91E-04 |
| S9 | -3.51E-01 | 2.89E-02 | -4.48E-04 | -2.49E-03 | 5.76E-04 | -1.65E-04 | -8.68E-04 |
| S10 | -7.06E-01 | 4.16E-02 | 2.83E-03 | -1.86E-04 | 8.49E-04 | -4.58E-04 | -9.19E-04 |
| S11 | -5.99E-01 | -7.45E-02 | 5.57E-03 | 1.07E-04 | -4.24E-04 | 1.50E-04 | -6.67E-04 |
| S12 | 6.78E-01 | -1.25E-01 | 3.89E-02 | -1.34E-02 | 3.34E-03 | -8.46E-04 | 1.04E-03 |
| S13 | -6.46E-01 | 8.90E-02 | 1.19E-02 | -1.04E-02 | 5.70E-03 | -3.25E-03 | 1.89E-03 |
| S14 | -2.74E+00 | 3.96E-01 | -1.12E-01 | 3.03E-02 | -7.99E-03 | -1.15E-04 | 1.07E-03 |
TABLE 14-1
TABLE 14-2
Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows a distortion curve of the imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14C shows a magnification chromatic aberration curve of the imaging lens of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14C, the imaging lens provided in embodiment 7 can achieve good imaging quality.
In summary, examples 1 to 7 each satisfy the relationship shown in table 15.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| CT4/T45 | 3.94 | 4.61 | 8.74 | 4.59 | 3.02 | 2.62 | 2.84 |
| ImgH/BFL | 2.45 | 2.45 | 2.43 | 2.46 | 2.47 | 2.20 | 2.09 |
| TTL/ImgH | 1.55 | 1.57 | 1.56 | 1.55 | 1.54 | 1.75 | 1.54 |
| (CT4+CT5+CT6)/CT7 | 9.92 | 12.12 | 11.91 | 12.06 | 10.85 | 11.94 | 5.31 |
| f/tan(Semi-FOV) | 10.75 | 10.27 | 10.42 | 10.46 | 10.57 | 10.83 | 8.05 |
| f/(f6+|f7|) | 0.97 | 1.05 | 1.01 | 1.01 | 0.98 | 0.96 | 0.96 |
| f6/(R11-R12) | 0.47 | 0.43 | 0.47 | 0.45 | 0.45 | 0.46 | 0.29 |
| f7/(R13+R14) | 1.29 | 1.15 | 1.55 | 1.71 | 1.97 | 1.24 | 2.35 |
| (R13+R14)/(R13-R14) | 0.32 | 0.32 | 0.27 | 0.24 | 0.22 | 0.32 | 0.16 |
| (R1+R4)/(CT1+CT2) | 6.04 | 7.29 | 5.29 | 5.30 | 5.19 | 8.11 | 6.97 |
| (DT41+DT42)/DT51 | 1.49 | 1.61 | 1.56 | 1.53 | 1.48 | 1.58 | 1.73 |
| (ET4+ET6)/ET7 | 6.08 | 6.66 | 3.40 | 3.74 | 4.05 | 2.59 | 0.59 |
| (SAG71-SAG72)/(SAG71+SAG72) | -0.01 | 0.02 | 0.09 | 0.07 | 0.05 | 0.45 | 0.45 |
TABLE 15
The present application also provides an imaging device, the electron-sensitive element of which may 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 device is equipped with the imaging lens described above.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (10)
1. The imaging lens, its characterized in that includes in proper order from the object side to the image side along the optical axis: a first lens having positive optical power; a second lens; a third lens element with a concave image-side surface; a fourth lens element with a convex image-side surface; a fifth lens; a sixth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; and a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface, wherein,
the center thickness CT4 of the fourth lens on the optical axis, the air interval T45 between the fourth lens and the fifth lens on the optical axis, half of the diagonal length ImgH of the effective pixel region of the imaging lens, and the distance BFL between the image side surface of the seventh lens and the imaging surface of the imaging lens on the optical axis satisfy: 2.0< CT4/T45<9.0 and 1.5< ImgH/BFL <3.0.
2. The imaging lens as claimed in claim 1, wherein at least one of the second lens and the third lens has negative power, and at least one of the fourth lens and the fifth lens has negative power.
3. The imaging lens as claimed in claim 1, wherein a distance TTL of an object side surface of the first lens to an imaging surface of the imaging lens on the optical axis and a half of a diagonal length ImgH of an effective pixel region of the imaging lens satisfy: 1.0< TTL/ImgH <2.0.
4. The imaging lens according to claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy:
5.0<(CT4+CT5+CT6)/CT7<12.5。
5. the imaging lens as claimed in claim 1, wherein an effective focal length f of the imaging lens and half of a maximum field angle Semi-FOV of the imaging lens satisfy: 7.5< f/tan (Semi-FOV) <11.0.
6. The imaging lens according to claim 1, wherein an effective focal length f of the imaging lens, an effective focal length f6 of the sixth lens, and an effective focal length f7 of the seventh lens satisfy: 0.5< f/(f6+|f7|) <1.5.
7. The imaging lens as claimed in claim 1, wherein an effective focal length f6 of the sixth lens, a radius of curvature R11 of an object-side surface of the sixth lens, and a radius of curvature R12 of an image-side surface of the sixth lens satisfy:
0<f6/(R11-R12)<1.0。
8. the imaging lens as claimed in claim 1, wherein an effective focal length f7 of the seventh lens, a radius of curvature R13 of an object-side surface of the seventh lens, and a radius of curvature R14 of an image-side surface of the seventh lens satisfy:
0.5<f7/(R13+R14)<2.5。
9. the imaging lens according to claim 1, wherein a radius of curvature R13 of an object side surface of the seventh lens and a radius of curvature R14 of an image side surface of the seventh lens satisfy: 0< (R13+R14)/(R13-R14) <0.8.
10. The imaging lens according to any one of claims 1 to 9, wherein a radius of curvature R1 of an object side surface of the first lens, a radius of curvature R4 of an image side surface of the second lens, a center thickness CT1 of the first lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy:
5.0<(R1+R4)/(CT1+CT2)<9.0。
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