CN110196485B - Optical imaging lens - Google Patents

Optical imaging lens Download PDF

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Publication number
CN110196485B
CN110196485B CN201910642117.2A CN201910642117A CN110196485B CN 110196485 B CN110196485 B CN 110196485B CN 201910642117 A CN201910642117 A CN 201910642117A CN 110196485 B CN110196485 B CN 110196485B
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lens
optical imaging
imaging lens
optical
satisfy
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CN110196485A (en
Inventor
徐武超
陈晨
徐标
周楹
张凯元
戴付建
赵烈烽
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN202311500873.4A priority Critical patent/CN117331200A/en
Priority to CN201910642117.2A priority patent/CN110196485B/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The application provides an optical imaging lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power, the image side surface of which is concave; a third lens having optical power; a fourth lens having negative optical power; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; a sixth lens having optical power; the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens satisfy |R11/R12| < 1; the aperture value FNO of the optical imaging lens and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens meet FNO/ImgH < 0.5mm ‑1.

Description

Optical imaging lens
Technical Field
The present application relates to an optical imaging lens, and in particular to an optical imaging lens including six lenses.
Background
At present, the requirement on the imaging function of the portable electronic equipment is higher and higher, and the optical characteristic of the optical imaging lens directly influences the imaging quality of an initial image, so that the requirement on the performance of the optical imaging lens matched with the portable electronic equipment is also higher and higher. Particularly, with the improvement of the performance of an image sensor, an optical imaging lens with a large aperture, a large image plane and good image quality is desired.
Disclosure of Invention
The present application provides an optical imaging lens, e.g., a large aperture, large image plane optical imaging lens, that at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
The application provides an optical imaging lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens having positive optical power; a second lens having negative optical power, the image side surface of which is concave; a third lens having optical power; a fourth lens having negative optical power; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; a sixth lens having optical power.
According to the embodiment of the application, the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R12 of the image side surface of the sixth lens can satisfy |R11/R12| < 1.
According to the embodiment of the application, the aperture value FNO of the optical imaging lens and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens can meet the requirement that FNO/ImgH is smaller than 0.5mm -1.
According to the embodiment of the application, the effective focal length f of the optical imaging lens and the curvature radius R12 of the image side surface of the sixth lens can satisfy f/R12 < 1.
According to an embodiment of the present application, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R11 of the object-side surface of the sixth lens may satisfy-2 < R1/R11 < -1.
According to an embodiment of the present application, the radius of curvature R9 of the object-side surface of the fifth lens and the radius of curvature R10 of the image-side surface of the fifth lens may satisfy 0 < (R9+R10)/(R9-R10) < 0.5.
According to an embodiment of the present application, the separation distance T23 of the second lens and the third lens on the optical axis and the separation distance T34 of the third lens and the fourth lens on the optical axis may satisfy 1 < T23/T34 < 2.
According to an embodiment of the present application, the separation distance T45 of the fourth lens and the fifth lens on the optical axis and the separation distance T56 of the fifth lens and the sixth lens on the optical axis may satisfy 0.8 < T45/T56 < 1.3.
According to the embodiment of the application, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis can meet 0.7 < CT2/CT3 < 1.1.
According to the embodiment of the application, the center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis can meet 0.7 < CT3/CT4 < 1.1.
According to the embodiment of the application, the sum Σct of the center thicknesses of the first lens element to the sixth lens element on the optical axis and the sum Σat of the spacing distances of any two adjacent lens elements in the first lens element to the sixth lens element on the optical axis can satisfy 1.4 < Σct/Σat < 1.8.
According to the embodiment of the application, the on-axis distance BFL from the image side surface of the sixth lens element to the imaging surface of the optical imaging lens element and the on-axis distance TTL from the object side surface of the first lens element to the imaging surface of the optical imaging lens element can satisfy 0.15 < BFL/TTL < 0.2.
According to the embodiment of the application, the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis can satisfy 0.8 < ET4/CT4 < 1.
According to an embodiment of the present application, the maximum effective radius DT21 of the object-side surface of the second lens and the maximum effective radius DT32 of the image-side surface of the third lens may satisfy 0.8 < DT21/DT32 < 1.1.
According to an embodiment of the present application, the maximum effective radius DT52 of the image side surface of the fifth lens element and the maximum effective radius DT61 of the object side surface of the sixth lens element may satisfy 0.8 < DT52/DT61 < 1.
According to an embodiment of the present application, an on-axis distance SAG51 from an intersection point of the object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens and an on-axis distance SAG61 from an intersection point of the object side surface of the sixth lens and the optical axis to an effective radius vertex of the object side surface of the sixth lens may satisfy 0.3 < SAG51/SAG61 < 0.6.
The application provides an optical imaging lens comprising a plurality of (e.g. six) lenses, which has the beneficial effects of high-pixel, large-aperture and high-definition imaging and is easy to process and obtain by reasonably distributing the focal power, the surface of each lens, the center thickness of each lens, the axial spacing between each lens and the like.
Drawings
The above and other advantages of embodiments of the present application will become apparent by reference to the following detailed description of the embodiments of the application with the accompanying drawings, which are intended to illustrate exemplary embodiments of the application and not to limit it. In the drawings:
fig. 1 shows a schematic configuration diagram of an optical imaging lens according to a first embodiment of the present application;
fig. 2A to 2D sequentially show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve according to the first embodiment of the present application;
Fig. 3 is a schematic structural view showing an optical imaging lens according to a second embodiment of the present application;
fig. 4A to 4D sequentially show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve according to the second embodiment of the present application;
fig. 5 shows a schematic structural diagram of an optical imaging lens according to a third embodiment of the present application;
Fig. 6A to 6D sequentially show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve according to the third embodiment of the present application;
fig. 7 shows a schematic structural diagram of an optical imaging lens according to a fourth embodiment of the present application;
Fig. 8A to 8D sequentially show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve according to the fourth embodiment of the present application.
Fig. 9 is a schematic structural view showing an optical imaging lens according to a fifth embodiment of the present application;
Fig. 10A to 10D sequentially show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve according to the fifth embodiment of the present application;
Fig. 11 is a schematic structural diagram showing an optical imaging lens according to a sixth embodiment of the present application; and
Fig. 12A to 12D sequentially show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve according to the sixth embodiment of the present application.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens of an optical imaging 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. In each lens, the surface closest to the subject is referred to as the subject side of the lens; in each lens, the surface closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The optical imaging lens according to an exemplary embodiment of the present application may include: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The six lenses are sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens has positive optical power; the second lens has negative focal power, and the image side surface of the second lens is a concave surface; the third lens has positive optical power or negative optical power; the fourth lens has negative focal power; the fifth lens has positive focal power or negative focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive optical power or negative optical power. The focal power and the surface shape are reasonably distributed, so that the optical imaging lens has high-pixel imaging.
In an exemplary embodiment, the optical imaging lens provided by the application may further include a diaphragm, where the diaphragm is disposed between the object side and the first lens.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the conditional expression |r11/r12| < 1, wherein R11 is a radius of curvature of an object side surface of the sixth lens element, and R12 is a radius of curvature of an image side surface of the sixth lens element. In an exemplary embodiment, R11 and R12 may satisfy |R11/R12| < 0.3. The curvature radius of the two mirror surfaces of the sixth lens is controlled, so that the Chief Ray Angle (CRA) of the optical imaging lens is matched with a photosensitive sensor at an imaging surface, a long rear working distance is obtained, and the imaging quality of the optical imaging lens is improved.
In an exemplary embodiment, the optical imaging lens provided by the application can meet the condition that FNO/ImgH is smaller than 0.5mm -1, wherein FNO is the aperture value of the optical imaging lens, and ImgH is half of the diagonal length of the effective pixel area at the imaging surface of the optical imaging lens. In an exemplary embodiment, FNO and ImgH may satisfy FNO/ImgH < 0.42mm -1. The aperture value and the image height ratio of the optical imaging lens are controlled, so that the optical imaging lens has a large image plane and a large aperture.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the condition that f/R12 < 1, where f is an effective focal length of the optical imaging lens, and R12 is a curvature radius of an image side surface of the sixth lens. In an exemplary embodiment, f and R12 may satisfy f/R12 < 0.8. The ratio of the effective focal length of the optical imaging lens to the curvature radius of the image side surface of the sixth lens is configured, so that the axial spherical aberration of the optical imaging lens can be corrected, and the imaging quality of the optical imaging lens can be improved.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the condition of-2 < R1/R11 < -1 >, wherein R12 is the radius of curvature of the object side surface of the first lens, and R11 is the radius of curvature of the object side surface of the sixth lens. In an exemplary embodiment, R1 and R11 may satisfy-1.30 < R1/R11 < -1.03. By controlling the ratio of the radius of curvature of the object-side surface of the first lens to the radius of curvature of the object-side surface of the sixth lens, the curvature of field and astigmatism of the optical imaging system can be corrected, and in addition, each lens is easy to process and has good process quality.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the condition that (r9+r10)/(R9-R10) < 0.5, wherein R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens. In an exemplary embodiment, R9 and R10 may satisfy 0.20 < (R9+R10)/(R9-R10) < 0.45. By controlling the curvature radius of the two mirror surfaces of the fifth lens, the contribution of the two mirror surfaces of the fifth lens to the astigmatic quantity of the optical imaging lens can be effectively controlled, and then the image quality of the intermediate view field and the image quality of the aperture zone of the optical imaging lens are controlled, so that the imaging quality of the optical imaging lens is high.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the condition that 1 < T23/T34 < 2, wherein T23 is the distance between the second lens and the third lens on the optical axis, and T34 is the distance between the third lens and the fourth lens on the optical axis. In an exemplary embodiment, T23 and T34 may satisfy 1.20 < T23/T34 < 1.85. The thickness ratio of the air spaces at two sides of the third lens is controlled, so that the structural compactness of the optical imaging lens is improved, and the sensitivity of the air spaces to field curvature is reduced.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the conditional expression 0.8 < T45/T56 < 1.3, wherein T45 is the interval distance between the fourth lens and the fifth lens on the optical axis, and T56 is the interval distance between the fifth lens and the sixth lens on the optical axis. In an exemplary embodiment, T45 and T56 may satisfy 0.85 < T45/T56 < 1.25. Controlling the thickness ratio of the air spaces on both sides of the fifth lens can compensate the distortion amount of the optical imaging lens, and is beneficial to adjusting the contribution amount of the first lens to the third lens to the distortion of the optical imaging lens.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the conditional expression 0.7 < CT2/CT3 < 1.1, wherein CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. In an exemplary embodiment, CT2 and CT3 may satisfy 0.75 < CT2/CT3 < 1.05. The thickness ratio of the second lens to the third lens is controlled, so that the structural compactness of the optical imaging lens is guaranteed, and the optical imaging lens is lighter.
In an exemplary embodiment, the optical imaging lens provided by the application can meet the condition that the CT3/CT4 is less than 1.1, wherein the CT3 is the center thickness of the third lens on the optical axis, and the CT4 is the center thickness of the fourth lens on the optical axis. In an exemplary embodiment, CT3 and CT4 may satisfy 0.8 < CT3/CT4 < 1.05. The thickness ratio of the third lens to the fourth lens is controlled, so that the axial chromatic aberration and spherical aberration of the optical imaging system can be corrected, and the optical imaging system has good imaging performance.
In an exemplary embodiment, the optical imaging lens provided by the present application may satisfy the condition of 1.4 < Σct/Σat < 1.8, where Σct is a sum of center thicknesses of each of the first lens to the sixth lens on the optical axis, and Σat is a sum of interval distances between two adjacent lenses of the first lens to the sixth lens on the optical axis. In an exemplary embodiment, Σct and Σat may satisfy 1.45 < Σct/Σat < 1.70. The ratio of the sum of the thicknesses of the lenses in the first lens to the sixth lens to the sum of the thicknesses of the air spaces between the adjacent lenses is controlled, so that the thicknesses of the lenses can be balanced, the range of residual distortion after the lenses are assembled is further controlled, and the optical imaging lens has good distortion performance.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the conditional expression 0.15 < BFL/TTL < 0.2, where BFL is an on-axis distance from an image side surface of the sixth lens element to an imaging surface of the optical imaging lens element, and TTL is an on-axis distance from an object side surface of the first lens element to the imaging surface of the optical imaging lens element. In an exemplary embodiment, BFL and TTL can satisfy 0.16 < BFL/TTL < 0.19. The ratio of the rear working distance to the optical length is controlled, so that the longer rear working distance is facilitated, and meanwhile, the angle of the main light in the field of view is suitable, so that the optical imaging lens is suitable for matching with different photosensitive chips.
In an exemplary embodiment, the optical imaging lens provided by the application can meet the condition that ET4/CT4 is less than 1, wherein ET4 is the edge thickness of the fourth lens, and CT4 is the center thickness of the fourth lens on the optical axis. In an exemplary embodiment, ET4 and CT4 may satisfy 0.85 < ET4/CT4 < 0.95. The ratio of the edge thickness of the fourth lens to the center thickness of the fourth lens is controlled, so that the fourth lens is easy to process and has good process performance.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the conditional expression 0.8 < DT21/DT32 < 1.1, wherein DT21 is the maximum effective radius of the object side surface of the second lens element, and DT32 is the maximum effective radius of the image side surface of the third lens element. In an exemplary embodiment, DT21 and DT32 may satisfy 0.9 < DT21/DT32 < 1.05. The second lens and the third lens have good processability by controlling the maximum effective radius of the object side surface of the second lens and the maximum effective radius of the image side surface of the third lens.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the conditional expression 0.8 < DT52/DT61 < 1, wherein DT52 is the maximum effective radius of the image side surface of the fifth lens element, and DT61 is the maximum effective radius of the object side surface of the sixth lens element. In an exemplary embodiment, DT52 and DT61 may satisfy 0.85 < DT52/DT61 < 0.90. The maximum effective radius of the image side surface of the fifth lens and the maximum effective radius of the object side surface of the sixth lens are controlled, so that the relative brightness of the view field edge position of the optical imaging lens is improved, the chip correspondence of the view field edge position is improved, and dark corners of images are avoided.
In an exemplary embodiment, the optical imaging lens provided by the application can satisfy the condition that 0.3 < SAG51/SAG61 < 0.6, wherein SAG51 is an on-axis distance from an intersection point of an object side surface of the fifth lens and an optical axis to an effective radius vertex of the object side surface of the fifth lens, SAG61 is an on-axis distance from an intersection point of the object side surface of the sixth lens and the optical axis to an effective radius vertex of the object side surface of the sixth lens, and in an exemplary embodiment, SAG51 and SAG61 can satisfy 0.35 < SAG51/SAG61 < 0.55. The sagittal height of the object side surface of the fifth lens and the sagittal height of the object side surface of the sixth lens are controlled, so that the plane type smooth transition of the two mirror surfaces is facilitated, the processing and forming of the two mirror surfaces are facilitated, and the fifth lens and the sixth lens have good processing property and processing performance.
Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located at the imaging surface.
The optical imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. The optical imaging lens has good performance and has the characteristics of high pixels, large aperture and easy manufacture by reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like. The optical imaging lens provided by the embodiment of the application has high-quality imaging performance.
In the embodiment of the present application, aspherical mirror surfaces are often used as the mirror surfaces of the respective lenses. At least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.
Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens may be aspherical. Optionally, each of the first, second, third, fourth, fifth and sixth lenses may be aspheric on the object-side and image-side surfaces. Optionally, the object side surface and the image side surface of the first lens are aspheric. Optionally, the object side surface and the image side surface of the fourth lens are aspheric. Optionally, the image side surface of the fifth lens element and the object side surface of the sixth lens element are aspheric. Optionally, the object side surface of the first lens element, the object side surface of the fourth lens element, the object side surface of the fifth lens element and the object side surface of the sixth lens element are aspheric.
Specific examples of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 2D, the optical imaging lens of the present embodiment sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7. A stop STO may be provided between the first lens E1 and the object side. Any two adjacent lenses may have an air space between them.
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 concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging lens of the present embodiment has an imaging surface S15. Light from the object sequentially passes through the respective surfaces (S1 to S14) and is imaged on the imaging surface S15.
Table 1 shows a basic parameter table of the optical imaging lens of the present embodiment, in which the units of radius of curvature, thickness, and focal length are all millimeters (mm), specifically as follows:
TABLE 1
Wherein TTL is an on-axis distance from the object side surface S1 of the first lens E1 to the imaging surface S15 of the optical imaging lens, imgH is a half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens, f is an effective focal length of the optical imaging lens, and Fno is an aperture value of the optical imaging lens.
The object side surface and the image side surface of any one of the first lens element E1 to the sixth lens element E6 of the optical imaging lens are aspheric, and the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following table 2 gives the higher order coefficients a 4、A6、A8、A10、A12、A14、A16、A18 and a 20 that can be used for the respective aspherical surfaces S1 to S12 in accordance with embodiment one.
TABLE 2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of the present embodiment, which represents deviation of converging focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 2B shows an astigmatism curve of the optical imaging lens of the present embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the optical imaging lens of the present embodiment, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration curve of magnification of the optical imaging lens of the present embodiment, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 2A to 2D, the optical imaging lens provided in the present embodiment can achieve good imaging quality.
Example two
An optical imaging lens according to a second embodiment of the present application will be described below with reference to fig. 3 to 4D, and in the present exemplary embodiment and the following embodiments, descriptions of portions similar to those of the first embodiment will be omitted for brevity.
The optical imaging lens of the present embodiment sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7. A stop STO may be provided between the first lens E1 and the object side. Any two adjacent lenses may have an air space between them.
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 convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging lens of the present embodiment has an imaging surface S15. Light from the object sequentially passes through the respective surfaces (S1 to S14) and is imaged on the imaging surface S15.
Table 3 shows a basic parameter table of the optical imaging lens of the present embodiment, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm), and table 4 shows the higher order coefficients of the respective aspherical surfaces usable for the optical imaging lens of the present embodiment, in which the respective aspherical surface forms can be defined by the foregoing formula (1), specifically as follows:
TABLE 3 Table 3
TABLE 4 Table 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of the present embodiment, which represents deviation of converging focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 4B shows an astigmatism curve of the optical imaging lens of the present embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging lens of the present embodiment, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a magnification chromatic aberration curve of the optical imaging lens of the present embodiment, which represents deviations of different image heights on an imaging plane after light passes through the optical imaging lens. As can be seen from fig. 4A to 4D, the optical imaging lens provided in the present embodiment can achieve good imaging quality.
Example III
An optical imaging lens according to a third embodiment of the present application is described below with reference to fig. 5 to 6D. The optical imaging lens of the present embodiment sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7. A stop STO may be provided between the first lens E1 and the object side. Any two adjacent lenses may have an air space between them.
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 concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging lens of the present embodiment has an imaging surface S15. Light from the object sequentially passes through the respective surfaces (S1 to S14) and is imaged on the imaging surface S15.
Table 5 shows a basic parameter table of the optical imaging lens of the present embodiment, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm), and table 6 shows the higher order coefficients of the respective aspherical surfaces usable for the optical imaging lens of the present embodiment, in which the respective aspherical surface forms can be defined by the foregoing formula (1), specifically as follows:
TABLE 5
TABLE 6
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of the present embodiment, which represents deviation of converging focal points of light rays of different wavelengths after passing through the optical imaging lens. Fig. 6B shows an astigmatism curve of the optical imaging lens of the present embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging lens of the present embodiment, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of the present embodiment, which represents deviations of different image heights on the imaging plane after light passes through the optical imaging lens. As can be seen from fig. 6A to 6D, the optical imaging lens provided in the present embodiment can achieve good imaging quality.
Example IV
An optical imaging lens according to a fourth embodiment of the present application is described below with reference to fig. 7 to 8D. The optical imaging lens of the present embodiment sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7. A stop STO may be provided between the first lens E1 and the object side. Any two adjacent lenses may have an air space between them.
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 negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging lens of the present embodiment has an imaging surface S15. Light from the object sequentially passes through the respective surfaces (S1 to S14) and is imaged on the imaging surface S15.
Table 7 shows a basic parameter table of the optical imaging lens of the present embodiment, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm), and table 8 shows the higher order coefficients of the respective aspherical surfaces usable for the optical imaging lens of the present embodiment, in which the respective aspherical surface forms can be defined by the foregoing formula (1), specifically as follows:
TABLE 7
TABLE 8
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of the present embodiment, which represents the deviation of the converging focus after light rays of different wavelengths pass through the optical imaging lens. Fig. 8B shows an astigmatism curve of the optical imaging lens of the present embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging lens of the present embodiment, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens of the present embodiment, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging lens. As can be seen from fig. 8A to 8D, the optical imaging lens provided in the present embodiment can achieve good imaging quality.
Example five
An optical imaging lens according to a fifth embodiment of the present application is described below with reference to fig. 9 to 10D. The optical imaging lens of the present embodiment sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7. A stop STO may be provided between the first lens E1 and the object side. Any two adjacent lenses may have an air space between them.
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 concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging lens of the present embodiment has an imaging surface S15. Light from the object sequentially passes through the respective surfaces (S1 to S14) and is imaged on the imaging surface S15.
Table 9 shows a basic parameter table of the optical imaging lens of the present embodiment, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm), and table 10 shows the higher order coefficients of the respective aspherical surfaces usable for the optical imaging lens of the present embodiment, in which the respective aspherical surface forms can be defined by the foregoing formula (1), specifically as follows:
TABLE 9
Table 10
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of the present embodiment, which represents the deviation of the converging focus after light rays of different wavelengths pass through the optical imaging lens. Fig. 10B shows an astigmatism curve of the optical imaging lens of the present embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging lens of the present embodiment, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a magnification chromatic aberration curve of the optical imaging lens of the present embodiment, which represents deviations of different image heights on an imaging plane after light passes through the optical imaging lens. As can be seen from fig. 10A to 10D, the optical imaging lens provided in the present embodiment can achieve good imaging quality.
Example six
An optical imaging lens according to a sixth embodiment of the present application is described below with reference to fig. 11 to 12D. The optical imaging lens of the present embodiment sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a filter E7. A stop STO may be provided between the first lens E1 and the object side. Any two adjacent lenses may have an air space between them.
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 concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The filter E7 has an object side surface S13 and an image side surface S14. The optical imaging lens of the present embodiment has an imaging surface S15. Light from the object sequentially passes through the respective surfaces (S1 to S14) and is imaged on the imaging surface S15.
Table 11 shows a basic parameter table of the optical imaging lens of the present embodiment, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm), and table 12 shows the higher order coefficients of the respective aspherical surfaces usable for the optical imaging lens of the present embodiment, in which the respective aspherical surface forms can be defined by the foregoing formula (1), specifically as follows:
TABLE 11
Table 12
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of the present embodiment, which represents the deviation of the converging focus after light rays of different wavelengths pass through the optical imaging lens. Fig. 12B shows an astigmatism curve of the optical imaging lens of the present embodiment, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging lens of the present embodiment, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a magnification chromatic aberration curve of the optical imaging lens of the present embodiment, which represents deviations of different image heights on an imaging plane after light passes through the optical imaging lens. As can be seen from fig. 12A to 12D, the optical imaging lens provided in the present embodiment can achieve good imaging quality.
In summary, the first to sixth embodiments correspond to satisfy the relationship shown in table 13 below.
TABLE 13
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However, it will be appreciated by those skilled in the art that the number of lenses making up the optical imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the technical solution claimed in the present application. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to include six lenses. The optical imaging lens may also include other numbers of lenses, if desired.
In an exemplary embodiment, the present application also provides an image pickup apparatus provided with an electronic photosensitive element for imaging, which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The image pickup apparatus may be a stand-alone image pickup device such as a digital camera, or may be an image pickup module integrated on a mobile electronic device such as a cellular phone. The image pickup apparatus is equipped with the optical imaging lens described above.
Exemplary embodiments of the present application are described above with reference to the accompanying drawings. It will be appreciated by those skilled in the art that the above-described embodiments are examples for illustrative purposes only and are not intended to limit the scope of the present application. Any modifications, equivalents, and so forth that come within the teachings of the application and the scope of the claims are intended to be included within the scope of the application as claimed.

Claims (12)

1. The optical imaging lens is characterized by sequentially comprising, from an object side to an image side along an optical axis:
The first lens with positive focal power has a convex object side surface and a concave image side surface;
A second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
A third lens having optical power;
A fourth lens having negative optical power;
the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;
a sixth lens element with negative refractive power having a concave object-side surface and a concave image-side surface;
The number of lenses of the optical imaging lens with focal power is six;
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 |R11/R12| < 1;
the effective focal length f of the optical imaging lens and the curvature radius R12 of the image side surface of the sixth lens meet the condition that f/R12 is more than or equal to 0.08 and less than 1;
The aperture value FNo of the optical imaging lens and half of the diagonal length ImgH of an effective pixel area on the imaging surface of the optical imaging lens meet 0.26mm -1≤Fno/ImgH≤0.4mm-1;
The interval distance T45 between the fourth lens and the fifth lens on the optical axis and the interval distance T56 between the fifth lens and the sixth lens on the optical axis satisfy that T45/T56 is more than or equal to 0.88 and less than 1.3.
2. The optical imaging lens as claimed in claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R11 of an object side surface of the sixth lens satisfy-2 < R1/R11 < -1.
3. The optical imaging lens as claimed in claim 1, wherein a radius of curvature R9 of an object side surface of the fifth lens and a radius of curvature R10 of an image side surface of the fifth lens satisfy 0 < (r9+r10)/(R9-R10) < 0.5.
4. The optical imaging lens according to claim 1, wherein a separation distance T23 of the second lens and the third lens on the optical axis and a separation distance T34 of the third lens and the fourth lens on the optical axis satisfy 1 < T23/T34 < 2.
5. The optical imaging lens according to claim 1, wherein a center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy 0.7 < CT2/CT3 < 1.1.
6. The optical imaging lens according to claim 1, wherein a center thickness CT3 of the third lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy 0.7 < CT3/CT4 < 1.1.
7. The optical imaging lens according to claim 1, wherein a sum Σct of center thicknesses of the first lens to the sixth lens on the optical axis and a sum Σat of a separation distance between any adjacent two lenses of the first lens to the sixth lens on the optical axis satisfy 1.4 < Σct/Σat < 1.8, respectively.
8. The optical imaging lens of claim 1, wherein an on-axis distance BFL from an image side of the sixth lens to an imaging surface of the optical imaging lens and an on-axis distance TTL from an object side of the first lens to the imaging surface of the optical imaging lens satisfy 0.15 < BFL/TTL < 0.2.
9. The optical imaging lens as claimed in claim 1, wherein an edge thickness ET4 of the fourth lens and a center thickness CT4 of the fourth lens on the optical axis satisfy 0.8 < ET4/CT4 < 1.
10. The optical imaging lens as claimed in claim 1, wherein a maximum effective radius DT21 of an object side surface of the second lens and a maximum effective radius DT32 of an image side surface of the third lens satisfy 0.8 < DT21/DT32 < 1.1.
11. The optical imaging lens as claimed in claim 1, wherein a maximum effective radius DT52 of an image side surface of the fifth lens and a maximum effective radius DT61 of an object side surface of the sixth lens satisfy 0.8 < DT52/DT61 < 1.
12. The optical imaging lens according to any one of claims 1 to 11, wherein an on-axis distance SAG51 from an intersection of the object side surface of the fifth lens and the optical axis to an effective radius vertex of the object side surface of the fifth lens and an on-axis distance SAG61 from an intersection of the object side surface of the sixth lens and the optical axis to an effective radius vertex of the object side surface of the sixth lens satisfy 0.3 < SAG51/SAG61 < 0.6.
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