CN107436477B - Optical imaging lens - Google Patents

Optical imaging lens Download PDF

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CN107436477B
CN107436477B CN201710801831.2A CN201710801831A CN107436477B CN 107436477 B CN107436477 B CN 107436477B CN 201710801831 A CN201710801831 A CN 201710801831A CN 107436477 B CN107436477 B CN 107436477B
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lens
optical imaging
image
imaging lens
optical
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CN107436477A (en
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张凯元
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN202110701581.1A priority Critical patent/CN113311570B/en
Priority to CN201710801831.2A priority patent/CN107436477B/en
Publication of CN107436477A publication Critical patent/CN107436477A/en
Priority to PCT/CN2018/080124 priority patent/WO2019047505A1/en
Priority to US16/229,231 priority patent/US11112585B2/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
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Abstract

The application discloses optical imaging lens, this optical imaging lens includes along optical axis from the thing side to the image side in proper order: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has focal power, and the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens and the fourth lens both have focal power; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, and the object side surface and the image side surface of the sixth lens are both concave surfaces; and the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the condition that f/EPD is less than or equal to 1.6.

Description

Optical imaging lens
Technical Field
The present application relates to an optical imaging lens, and more particularly, to an optical imaging lens including six lenses.
Background
Along with the popularization of electronic products such as mobile phones and tablet computers, the portable requirements of people in daily life on the electronic products are met, and the trend of light and thin electronic products is higher and higher. As portable electronic products tend to be miniaturized, the total length of the matched lens is limited, thereby increasing the design difficulty of the lens.
Meanwhile, with the improvement of the performance and the reduction of the size of a common photosensitive element such as a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), the number of pixels of the photosensitive element is increased and the size of the pixels is reduced, so that a higher requirement is put forward for high imaging quality of a matched optical imaging lens.
The reduction in the size of the picture element means that the amount of light transmitted by the lens will be smaller for the same exposure time. However, in a dark environment (e.g., rainy day, dusk, etc.), the lens needs to have a large amount of light to ensure the imaging quality.
Disclosure of Invention
The present application provides a large aperture optical imaging lens applicable to portable electronic products that may solve at least or partially at least one of the above-mentioned disadvantages of the prior art.
In one aspect, the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has focal power, and the object side surface of the second lens can be a convex surface, and the image side surface of the second lens can be a concave surface; the third lens and the fourth lens both have focal power; the fifth lens can have positive focal power, and the image side surface of the fifth lens can be a convex surface; the sixth lens element can have a negative focal power, and both the object-side surface and the image-side surface can be concave; and the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens can satisfy f/EPD is less than or equal to 1.6.
In one embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens can satisfy TTL/ImgH ≦ 1.5.
In one embodiment, the effective focal length f1 of the first lens and the central thickness CT1 of the first lens on the optical axis satisfy 3 < f1/CT1 < 4.
In one embodiment, the central thickness CT2 of the second lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis satisfy 4 < CT2/T12 < 6.
In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens may satisfy 1.5 < R3/R4 < 2.5.
In one embodiment, the second lens has a negative power, and the effective focal length f2 and the total effective focal length f of the optical imaging lens satisfy-2 < f2/f < -1.
In one embodiment, the radius of curvature of the object-side surface R7 of the fourth lens and the radius of curvature of the image-side surface R8 of the fourth lens may satisfy-1 < (R7-R8)/(R7 + R8) < 2.
In one embodiment, the total effective focal length f of the optical imaging lens and the curvature radius R10 of the image side surface of the fifth lens can satisfy-3 < f/R10 < -2.5.
In one embodiment, the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens can satisfy 0.5 < f5/f < 1.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens element and the radius of curvature R12 of the image-side surface of the sixth lens element satisfy-2 < R11/R12 < -1.5.
In one embodiment, a sum Σ CT of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, and the sixth lens element on the optical axis and an on-axis distance TTL between an object side surface of the first lens element and an imaging surface of the optical imaging lens satisfy 0.5 < Σct/TTL < 0.7.
In another aspect, the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens and the fifth lens can both have positive focal power; the second lens and the sixth lens may each have a negative optical power; at least one of the third lens and the fourth lens may have positive optical power; at least one of the object-side surface and the image-side surface of the first lens may be convex; the object side surface and the image side surface of the sixth lens can both be concave surfaces; the image side surface of the fifth lens element can be convex, and the curvature radius R10 of the image side surface and the total effective focal length f of the optical imaging lens can satisfy-3 < f/R10 < -2.5.
In one embodiment, the object side surface of the first lens may be convex.
In one embodiment, the object-side surface of the second lens element can be convex and the image-side surface can be concave.
The present application employs a plurality of (e.g., six) lenses, and provides an optical imaging lens having at least one advantageous effect of high pixel, large aperture, ultra-thin, miniaturization, easy processing, and the like, by rationally distributing the power, the surface type, the center thickness of each lens, and the on-axis distance between each lens.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an optical imaging lens according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 1;
fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application;
fig. 4A to 4D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens of embodiment 2, respectively;
fig. 5 is a schematic structural view showing an optical imaging lens according to embodiment 3 of the present application;
fig. 6A to 6D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, respectively;
fig. 7 is a schematic structural view showing an optical imaging lens according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 4;
fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the optical imaging lens of embodiment 5;
fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;
fig. 12A to 12D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6, respectively;
fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application;
fig. 14A to 14D show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve of the optical 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 the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object-side surface, and the surface of each lens closest to the imaging surface is called the image-side surface.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to 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 present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The features, principles, and other aspects of the present application are described in detail below.
An optical imaging lens according to an exemplary embodiment of the present application includes, for example, six lenses having optical powers, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The six lenses are arranged along the optical axis in sequence from the object side to the image side. The optical imaging lens can also comprise a photosensitive element arranged on the imaging surface.
The first lens may have a positive optical power, at least one of the object-side surface and the image-side surface of which is convex. An effective focal length f1 of the first lens and a center thickness CT1 of the first lens on the optical axis may satisfy 3 < f1/CT1 < 4, and more specifically, f1 and CT1 may further satisfy 3.65. Ltoreq. F1/CT 1. Ltoreq.3.90. The processability of the first lens can be ensured by controlling the ratio of the effective focal length of the first lens to the center thickness of the first lens on the optical axis within a reasonable range; meanwhile, the spherical aberration contribution rate of the first lens can be effectively controlled within a reasonable range, so that the system has better imaging quality in the on-axis field of view and the near range.
Alternatively, the object-side surface of the first lens element can be convex, and the image-side surface can be convex or concave.
The second lens may have a positive or negative optical power. Optionally, the second lens has a negative focal power, and an effective focal length f2 thereof and a total effective focal length f of the optical imaging lens may satisfy-2 < f2/f < -1, and more specifically, f2 and f may further satisfy-1.69 < f2/f < 1.44. Through reasonable control of the focal power and the direction of the second lens, the contribution of the spherical aberration of the second lens and the direction of the spherical aberration can be used for offsetting most of the third-order spherical aberration generated by the first lens, and therefore the imaging quality of the lens can be effectively improved.
The object-side surface of the second lens element can be convex, and the image-side surface can be concave. The radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens can satisfy 1.5 < R3/R4 < 2.5, and more specifically, R3 and R4 can further satisfy 1.91 < R3/R4 < 2.15. By controlling the curvature radius of the object side surface and the image side surface of the second lens, the total deflection angle of the marginal field of view on the two surfaces can be controlled within a reasonable range, thereby effectively reducing the sensitivity of the system.
The center thickness CT2 of the second lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis may satisfy 4 < CT2/T12 < 6, and more specifically, CT2 and T12 may further satisfy 4.30 ≦ CT2/T12 ≦ 5.69. By restricting the ratio range of the central thickness CT2 of the second lens on the optical axis and the separation distance T12 between the first lens and the second lens on the optical axis, the distortion contribution amount of the first lens is controlled to compensate the distortion amount generated by the subsequent lenses.
The third lens has positive power or negative power. Alternatively, the third lens may have a positive optical power.
The fourth lens has positive power or negative power. The radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy-1 < (R7-R8)/(R7 + R8) < 2, and more specifically, R7 and R8 may further satisfy-0.55 ≦ (R7-R8)/(R7 + R8) ≦ 1.81. By controlling the ratio of the curvature radius of the object side surface and the curvature radius of the image side surface of the fourth lens, the contribution of the astigmatism of the object side surface and the astigmatism of the image side surface of the fourth lens can be effectively controlled, and the image quality of the middle view field and the aperture zone can be reasonably and effectively controlled.
The fifth lens may have a positive power, and an effective focal length f5 thereof and a total effective focal length f of the optical imaging lens may satisfy 0.5 < f5/f < 1, and more specifically, f5 and f may further satisfy 0.64 ≦ f5/f ≦ 0.66. By controlling the range of the effective focal length of the fifth lens, the contribution amount of the power of the fifth lens can be reasonably controlled, and the contribution amount of the negative spherical aberration of the fifth lens can be reasonably controlled, so that the negative spherical aberration generated by the fifth lens can effectively balance the positive spherical aberration generated by each negative member (i.e., each lens having a negative power in the lens).
The image-side surface of the fifth lens element can be convex. The total effective focal length f of the optical imaging lens and the curvature radius R10 of the image side surface S10 of the fifth lens can satisfy the condition that f/R10 is more than-3 and less than-2.5, and more specifically, f and R10 can further satisfy the condition that f/R10 is more than or equal to-2.81 and less than or equal to-2.67. By controlling the curvature radius of the image side surface of the fifth lens element, the contribution of the fifth-order spherical aberration of the fifth lens element can be well controlled, and further the third-order spherical aberration generated by the front lens element (i.e., each lens element between the object side and the fifth lens element) is compensated and balanced, so that the on-axis field of view area of the lens has good imaging quality.
The sixth lens element can have a negative power, and can have a concave object-side surface and a concave image-side surface. The radius of curvature R11 of the object-side surface of the sixth lens element and the radius of curvature R12 of the image-side surface of the sixth lens element can satisfy-2 < R11/R12 < -1.5, and more specifically, R11 and R12 can further satisfy-1.85 < R11/R12 < 1.73. By controlling the ratio range of the curvature radius of the object side surface and the image side surface of the sixth lens, the thickness ratio trend of the aspheric surface of the sixth lens can be reasonably controlled, so that the aspheric surface of the sixth lens falls within the range of an easily-processed interval, and the machinability of the lens is further improved.
The sum sigma-CT of the central thicknesses of the lenses with the focal powers on the optical axis and the total optical length TTL of the optical imaging lens (namely, the on-axis distance from the center of the object side surface of the first lens to the imaging surface of the lens) can satisfy 0.5 < sigma-CT/TTL < 0.7, and more specifically, sigma-0.57 < CT/TTL < 0.58. By controlling the range of the total central thickness of each lens with focal power, the residual distortion after the balance of each lens can be controlled in a reasonable range, so that the optical imaging system has good distortion elimination performance.
The total optical length TTL of the optical imaging lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens can meet the condition that TTL/ImgH is less than or equal to 1.5, and more specifically, TTL and ImgH can further meet the condition that TTL/ImgH is less than or equal to 1.46 and less than or equal to 1.49. By controlling the total optical length and the image high ratio of the lens, the total size of the imaging lens can be effectively compressed to realize the ultrathin characteristic and the miniaturization of the optical imaging lens, so that the optical imaging lens can be well suitable for systems with limited sizes, such as portable electronic products and the like.
f/EPD ≦ 1.6 may be satisfied between the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens, and more specifically, f and EPD may further satisfy 1.57 ≦ f/EPD ≦ 1.59. The smaller the f-number Fno of the optical imaging lens (i.e., the total effective focal length f of the lens/the entrance pupil diameter EPD of the lens), the larger the clear aperture of the lens, the more the amount of light entering in the same unit time. The reduction of f-number Fno can promote image plane luminance effectively for the shooting demand when the camera lens can satisfy light is not enough better. The lens is configured to satisfy the conditional expression f/EPD less than or equal to 1.6, and the lens has the advantage of large aperture in the process of increasing the light transmission quantity, so that the imaging effect of the lens in a dark environment is enhanced.
In an exemplary embodiment, the optical imaging lens may further be provided with a diaphragm for limiting the light beam to further improve the imaging quality of the lens. Alternatively, a diaphragm may be disposed between the first lens and the second lens. However, it should be understood by those skilled in the art that the stop may be disposed at any position between the object side and the image side as required, that is, the disposition of the stop should not be limited to between the first lens and the second lens.
Optionally, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the imaging surface.
The optical imaging lens according to the above-described embodiment of the present application may employ a plurality of lenses, for example, six lenses as described above. Through rational distribution of focal power and surface type of each lens, central thickness of each lens, on-axis distance between each lens and the like, the ultrathin large-aperture imaging lens which is applicable to portable electronic products and has the f-number Fno of about 1.5 is provided. The imaging system has the characteristics of high pixel, ultra-thin property, easiness in processing and the like, also has the advantage of a large aperture, and can enhance the imaging effect in a dark environment. In addition, the optical imaging lens can also ensure better matching with a large-image-plane CCD chip.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric lens is characterized in that: the curvature varies continuously from the center 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 better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses constituting an imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although six lenses are exemplified 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.
Specific examples of an optical imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An optical imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic structural diagram of an optical imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, 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 an imaging surface S15.
The first lens element E1 has positive refractive power, the object-side surface S1 is a convex surface, the image-side surface S2 is a convex surface, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are aspheric surfaces.
The second lens element E2 has negative refractive power, the object-side surface S3 is a convex surface, the image-side surface S4 is a concave surface, and both the object-side surface S3 and the image-side surface S4 of the second lens element E2 are aspheric surfaces.
The third lens element E3 has positive refractive power, the object-side surface S5 is a convex surface, the image-side surface S6 is a concave surface, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.
The fourth lens element E4 has negative refractive power, the object-side surface S7 is a convex surface, the image-side surface S8 is a concave surface, and both the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are aspheric.
The fifth lens element E5 has positive refractive power, the object-side surface S9 is a convex surface, the image-side surface S10 is a convex surface, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.
The sixth lens element E6 has negative refractive power, the object-side surface S11 is a concave surface, the image-side surface S12 is a concave surface, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Optionally, the optical imaging lens may further include a filter E7 having an object side surface S13 and an image side surface S14. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.
Optionally, a stop STO may be disposed between the first lens E1 and the second lens E2 to further improve the imaging quality of the lens.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 1, where the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure GDA0001584501340000091
Figure GDA0001584501340000101
TABLE 1
As can be seen from table 1, R3/R4=2.15 is satisfied between the radius of curvature R3 of the object-side surface S3 of the second lens E2 and the radius of curvature R4 of the image-side surface S4 of the second lens E2; a radius of curvature R7 of the object-side surface S7 of the fourth lens E4 and a radius of curvature R8 of the image-side surface S8 of the fourth lens E4 satisfy (R7-R8)/(R7 + R8) =0.02; R11/R12= -1.73 is satisfied between the radius of curvature R11 of the object-side surface S11 of the sixth lens E6 and the radius of curvature R12 of the image-side surface S12 of the sixth lens E6; CT2/T12=5.02 is satisfied between a center thickness CT2 of the second lens E2 on the optical axis and a separation distance T12 of the first lens E1 and the second lens E2 on the optical axis.
In the present embodiment, each lens may be an aspherical lens, and each aspherical surface type x is defined by the following formula:
Figure GDA0001584501340000102
wherein x is the distance rise from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the reciprocal of the radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below shows the coefficients A of the high-order terms which can be used for the aspherical mirror surfaces S1 to S12 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Figure GDA0001584501340000103
Figure GDA0001584501340000111
TABLE 2
Table 3 gives effective focal lengths f1 to f6 of the respective lenses, a total effective focal length f of the optical imaging lens, an optical total length TTL of the optical imaging lens (i.e., a distance on the optical axis from the center of the object side surface S1 of the first lens E1 to the imaging surface S15), and a half ImgH of a diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens in embodiment 1.
Figure GDA0001584501340000112
TABLE 3
As can be seen from table 3, f2/f = -1.44 is satisfied between the effective focal length f2 of the second lens element E2 and the total effective focal length f of the optical imaging lens; f5/f =0.64 is satisfied between the effective focal length f5 of the fifth lens E5 and the total effective focal length f of the optical imaging lens; the total optical length TTL of the optical imaging lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens meet the condition that TTL/ImgH =1.49.
As can be seen from tables 1 and 3, f/R10= -2.78 is satisfied between the total effective focal length f of the optical imaging lens and the radius of curvature R10 of the image-side surface S10 of the fifth lens E5; f1/CT1=3.65 is satisfied between an effective focal length f1 of the first lens E1 and a central thickness CT1 of the first lens E1 on the optical axis; the sum Σ CT of the central thicknesses on the optical axes of the first lens element E1 to the sixth lens element E6 and the total optical length TTL of the optical imaging lens satisfy Σ CT/TTL =0.57, respectively.
In embodiment 1, f/EPD =1.58 is satisfied between the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens.
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing a meridional field curvature and a sagittal field curvature of the optical imaging lens of embodiment 1. Fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1, which represents the distortion magnitude values in the case of different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging lens according to embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, 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 an imaging surface S15.
The first lens element E1 has positive refractive power, the object-side surface S1 is a convex surface, the image-side surface S2 is a convex surface, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are aspheric.
The second lens element E2 has negative refractive power, the object-side surface S3 is a convex surface, the image-side surface S4 is a concave surface, and both the object-side surface S3 and the image-side surface S4 of the second lens element E2 are aspheric surfaces.
The third lens element E3 has positive refractive power, the object-side surface S5 is convex, the image-side surface S6 is concave, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.
The fourth lens element E4 has negative refractive power, the object-side surface S7 is a convex surface, the image-side surface S8 is a concave surface, and both the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are aspheric.
The fifth lens element E5 has positive refractive power, the object-side surface S9 is a convex surface, the image-side surface S10 is a convex surface, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.
The sixth lens element E6 has negative refractive power, the object-side surface S11 is a concave surface, the image-side surface S12 is a concave surface, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Optionally, the optical imaging lens may further include a filter E7 having an object side surface S13 and an image side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Optionally, a stop STO may be disposed between the first lens E1 and the second lens E2 to further improve the imaging quality of the lens.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 2, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 5 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above. Table 6 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the total optical length TTL of the optical imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens in embodiment 2.
Figure GDA0001584501340000131
TABLE 4
Figure GDA0001584501340000132
Figure GDA0001584501340000141
TABLE 5
Figure GDA0001584501340000142
TABLE 6
Fig. 4A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 2, which represent the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 2. Fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2, which represents the distortion magnitude values in the case of different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the optical 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 4D, the optical imaging lens according to embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of an optical imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, 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 an imaging surface S15.
The first lens element E1 has positive refractive power, the object-side surface S1 is a convex surface, the image-side surface S2 is a concave surface, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are aspheric surfaces.
The second lens element E2 has negative refractive power, the object-side surface S3 is a convex surface, the image-side surface S4 is a concave surface, and both the object-side surface S3 and the image-side surface S4 of the second lens element E2 are aspheric surfaces.
The third lens element E3 has positive refractive power, the object-side surface S5 is a concave surface, the image-side surface S6 is a convex surface, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.
The fourth lens element E4 has negative refractive power, the object-side surface S7 is a convex surface, the image-side surface S8 is a concave surface, and both the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are aspheric.
The fifth lens element E5 has positive refractive power, the object-side surface S9 is a convex surface, the image-side surface S10 is a convex surface, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.
The sixth lens element E6 has negative refractive power, the object-side surface S11 is a concave surface, the image-side surface S12 is a concave surface, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Optionally, the optical imaging lens may further include a filter E7 having an object side surface S13 and an image side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Optionally, a stop STO may be disposed between the first lens E1 and the second lens E2 to further improve the imaging quality of the lens.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 3, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above. Table 9 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the total optical length TTL of the optical imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens in embodiment 3.
Figure GDA0001584501340000151
TABLE 7
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -7.6320E-03 4.2162E-02 -1.2865E-01 2.4608E-01 -3.1443E-01 2.6379E-01 -1.4009E-01 4.2462E-02 -5.6230E-03
S2 -8.0542E-02 4.4699E-01 -1.2798E+00 2.4335E+00 -3.1689E+00 2.7715E+00 -1.5517E+00 5.0109E-01 -7.0899E-02
S3 -1.7819E-01 6.3982E-01 -1.6557E+00 3.1674E+00 -4.2575E+00 3.9138E+00 -2.3318E+00 8.1089E-01 -1.2489E-01
S4 -1.0658E-01 1.6579E-01 3.0978E-01 -2.5703E+00 7.4932E+00 -1.2146E+01 1.1514E+01 -5.9673E+00 1.3114E+00
S5 -7.1994E-02 7.0692E-02 -4.2131E-01 1.1357E+00 -1.8958E+00 1.7499E+00 -7.1414E-01 -4.0835E-02 8.7490E-02
S6 -1.5281E-01 -3.9631E-03 2.9851E-01 -8.8206E-01 1.2499E+00 -1.1032E+00 6.3003E-01 -2.1103E-01 3.0452E-02
S7 -2.2938E-01 8.4816E-02 9.8406E-03 1.1087E-01 -4.9323E-01 5.8834E-01 -2.9957E-01 6.4548E-02 -4.1625E-03
S8 -1.6578E-01 9.1442E-03 1.0467E-01 -8.6646E-02 -3.2912E-02 7.7218E-02 -3.9213E-02 8.3595E-03 -6.6061E-04
S9 -2.2478E-02 -5.0185E-02 -2.2082E-02 1.2258E-01 -1.3640E-01 7.4855E-02 -2.2358E-02 3.5164E-03 -2.3145E-04
S10 -1.0162E-01 1.3472E-01 -1.9858E-01 1.8208E-01 -9.3459E-02 2.8323E-02 -5.1157E-03 5.1401E-04 -2.2277E-05
S11 -1.2920E-01 2.8849E-02 2.2501E-03 8.4625E-03 -6.7319E-03 2.0391E-03 -3.1662E-04 2.5336E-05 -8.3322E-07
S12 -1.0730E-01 6.2564E-02 -3.0571E-02 1.1335E-02 -3.0617E-03 5.7030E-04 -6.9216E-05 4.9269E-06 -1.5482E-07
TABLE 8
Figure GDA0001584501340000161
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 3. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents the distortion magnitude values in the case of different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging lens system according to embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, 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 an imaging surface S15.
The first lens element E1 has positive refractive power, the object-side surface S1 is a convex surface, the image-side surface S2 is a concave surface, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are aspheric surfaces.
The second lens element E2 has negative refractive power, the object-side surface S3 is a convex surface, the image-side surface S4 is a concave surface, and both the object-side surface S3 and the image-side surface S4 of the second lens element E2 are aspheric surfaces.
The third lens element E3 has positive refractive power, the object-side surface S5 is a convex surface, the image-side surface S6 is a concave surface, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.
The fourth lens element E4 has negative power, and the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are aspheric.
The fifth lens element E5 has positive refractive power, the object-side surface S9 is a convex surface, the image-side surface S10 is a convex surface, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.
The sixth lens element E6 has negative refractive power, the object-side surface S11 is a concave surface, the image-side surface S12 is a concave surface, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Optionally, the optical imaging lens may further include a filter E7 having an object side surface S13 and an image side surface S14. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.
Optionally, a stop STO may be disposed between the first lens E1 and the second lens E2 to further improve the imaging quality of the lens.
Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 4, where the unit of the radius of curvature and the thickness are both millimeters (mm). Table 11 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above. Table 12 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the total optical length TTL of the optical imaging lens, and the half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens in embodiment 4.
Figure GDA0001584501340000171
Figure GDA0001584501340000181
Watch 10
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -6.7477E-03 3.7494E-02 -1.1806E-01 2.3699E-01 -3.1728E-01 2.7739E-01 -1.5228E-01 4.7390E-02 -6.4045E-03
S2 -7.3915E-02 3.7606E-01 -1.0274E+00 1.9235E+00 -2.5140E+00 2.2296E+00 -1.2722E+00 4.1963E-01 -6.0698E-02
S3 -1.7138E-01 5.7533E-01 -1.4219E+00 2.6899E+00 -3.6466E+00 3.4130E+00 -2.0776E+00 7.3885E-01 -1.1643E-01
S4 -1.0802E-01 1.8623E-01 1.8514E-01 -2.0921E+00 6.3942E+00 -1.0617E+01 1.0253E+01 -5.4034E+00 1.2074E+00
S5 -7.3524E-02 8.4458E-02 -4.4967E-01 1.1804E+00 -1.9425E+00 1.7697E+00 -6.8553E-01 -8.7327E-02 1.0779E-01
S6 -1.5869E-01 4.2668E-02 1.3659E-01 -5.1225E-01 6.8022E-01 -5.3751E-01 2.7964E-01 -8.5310E-02 1.0240E-02
S7 -2.3669E-01 1.1880E-01 -7.2324E-02 2.2107E-01 -5.6943E-01 5.8364E-01 -2.5181E-01 3.5433E-02 1.3755E-03
S8 -1.6945E-01 2.9734E-02 5.9894E-02 -2.7645E-02 -8.6924E-02 1.1376E-01 -5.6398E-02 1.3109E-02 -1.2224E-03
S9 -2.4034E-02 -4.8191E-02 -6.7236E-03 8.6577E-02 -9.9652E-02 5.4117E-02 -1.5789E-02 2.4389E-03 -1.6141E-04
S10 -1.0394E-01 1.3592E-01 -1.9129E-01 1.7041E-01 -8.5530E-02 2.5369E-02 -4.4856E-03 4.4153E-04 -1.8781E-05
S11 -1.3271E-01 3.9358E-02 -9.3007E-03 1.5104E-02 -9.0156E-03 2.5279E-03 -3.8065E-04 3.0046E-05 -9.8253E-07
S12 -1.0663E-01 6.3151E-02 -3.1647E-02 1.2025E-02 -3.3170E-03 6.2901E-04 -7.7517E-05 5.5859E-06 -1.7714E-07
TABLE 11
Figure GDA0001584501340000182
TABLE 12
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 4. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4, which represents the distortion magnitude values in the case of different angles of view. Fig. 8D shows a chromatic aberration of magnification curve of the optical 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 8D, the optical imaging lens according to embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, 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 an imaging surface S15.
The first lens element E1 has positive refractive power, the object-side surface S1 is a convex surface, the image-side surface S2 is a concave surface, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are aspheric surfaces.
The second lens element E2 has negative power, the object-side surface S3 is convex, the image-side surface S4 is concave, and both the object-side surface S3 and the image-side surface S4 of the second lens element E2 are aspheric.
The third lens element E3 has positive refractive power, the object-side surface S5 is a convex surface, the image-side surface S6 is a convex surface, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.
The fourth lens element E4 has negative refractive power, and has a concave object-side surface S7 and a concave image-side surface S8, wherein the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are aspheric.
The fifth lens element E5 has positive refractive power, the object-side surface S9 is a convex surface, the image-side surface S10 is a convex surface, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.
The sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Optionally, the optical imaging lens may further include a filter E7 having an object side surface S13 and an image side surface S14. The light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Optionally, a stop STO may be disposed between the first lens E1 and the second lens E2 to further improve the imaging quality of the lens.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 5, where the units of the radius of curvature and the thickness are both millimeters (mm). Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above. Table 15 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the total optical length TTL of the optical imaging lens, and half ImgH of the diagonal length of the effective pixel area on the imaging surface S15 of the optical imaging lens in example 5.
Figure GDA0001584501340000201
Watch 13
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -6.8592E-03 3.9455E-02 -1.2493E-01 2.5518E-01 -3.4688E-01 3.0746E-01 -1.7070E-01 5.3604E-02 -7.2944E-03
S2 -9.7394E-02 5.0600E-01 -1.4157E+00 2.6897E+00 -3.5407E+00 3.1505E+00 -1.8000E+00 5.9380E-01 -8.5838E-02
S3 -1.9426E-01 7.1008E-01 -1.8279E+00 3.4927E+00 -4.7357E+00 4.4150E+00 -2.6731E+00 9.4467E-01 -1.4780E-01
S4 -1.1079E-01 1.9965E-01 2.2466E-01 -2.4925E+00 7.6641E+00 -1.2811E+01 1.2454E+01 -6.6082E+00 1.4870E+00
S5 -6.8889E-02 1.0668E-02 -2.0201E-02 -3.9764E-01 1.7836E+00 -3.8487E+00 4.5276E+00 -2.7934E+00 7.0906E-01
S6 -1.4088E-01 -2.0997E-02 3.1098E-01 -9.2031E-01 1.4043E+00 -1.4238E+00 9.5946E-01 -3.7343E-01 6.1222E-02
S7 -2.3060E-01 9.8543E-02 -7.1579E-02 3.3327E-01 -8.2682E-01 8.4259E-01 -3.7416E-01 5.6234E-02 2.0729E-03
S8 -1.7305E-01 4.8929E-02 -1.4729E-02 1.4514E-01 -3.2423E-01 3.1426E-01 -1.5860E-01 4.1767E-02 -4.5935E-03
S9 -1.9063E-02 -6.9338E-02 4.9969E-02 -6.8252E-03 -1.0110E-02 3.0170E-03 1.3110E-03 -6.5156E-04 7.0989E-05
S10 -9.3099E-02 1.1356E-01 -1.5358E-01 1.2798E-01 -5.8007E-02 1.5042E-02 -2.2508E-03 1.8149E-04 -6.1370E-06
S11 -1.2528E-01 3.6091E-02 -1.0099E-02 1.6027E-02 -9.3050E-03 2.5756E-03 -3.8560E-04 3.0398E-05 -9.9627E-07
S12 -9.9583E-02 5.6747E-02 -2.7487E-02 1.0241E-02 -2.8039E-03 5.2968E-04 -6.4879E-05 4.6187E-06 -1.4380E-07
TABLE 14
Figure GDA0001584501340000202
Watch 15
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 5. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents the distortion magnitude values in the case of different angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 5, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens according to embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, 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 an imaging surface S15.
The first lens element E1 has positive refractive power, the object-side surface S1 is a convex surface, the image-side surface S2 is a concave surface, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are aspheric surfaces.
The second lens element E2 has negative refractive power, the object-side surface S3 is a convex surface, the image-side surface S4 is a concave surface, and both the object-side surface S3 and the image-side surface S4 of the second lens element E2 are aspheric surfaces.
The third lens element E3 has positive refractive power, the object-side surface S5 is a convex surface, the image-side surface S6 is a convex surface, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.
The fourth lens element E4 has negative power, and has a concave object-side surface S7 and a convex image-side surface S8, wherein the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are aspheric.
The fifth lens element E5 has positive refractive power, the object-side surface S9 is a convex surface, the image-side surface S10 is a convex surface, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.
The sixth lens element E6 has negative refractive power, the object-side surface S11 is a concave surface, the image-side surface S12 is a concave surface, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Optionally, the optical imaging lens may further include a filter E7 having an object side surface S13 and an image side surface S14. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.
Optionally, a stop STO may be disposed between the first lens E1 and the second lens E2 to further improve the imaging quality of the lens.
Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 6, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 17 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above. Table 18 shows the effective focal lengths f1 to f6 of the respective lenses, the total effective focal length f of the optical imaging lens, the total optical length TTL of the optical imaging lens, and the half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical imaging lens in example 6.
Figure GDA0001584501340000221
TABLE 16
Figure GDA0001584501340000222
Figure GDA0001584501340000231
TABLE 17
Figure GDA0001584501340000232
Watch 18
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 6. Fig. 12C shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values in the case of different angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 6, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens according to embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 is a schematic structural view showing an optical imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging lens includes, in order from an object side to an imaging side along an optical axis, 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 an imaging surface S15.
The first lens element E1 has positive refractive power, the object-side surface S1 is convex, the image-side surface S2 is concave, and both the object-side surface S1 and the image-side surface S2 of the first lens element E1 are aspheric.
The second lens element E2 has negative power, the object-side surface S3 is convex, the image-side surface S4 is concave, and both the object-side surface S3 and the image-side surface S4 of the second lens element E2 are aspheric.
The third lens element E3 has positive refractive power, the object-side surface S5 is a convex surface, the image-side surface S6 is a convex surface, and both the object-side surface S5 and the image-side surface S6 of the third lens element E3 are aspheric.
The fourth lens element E4 has positive refractive power, the object-side surface S7 is a convex surface, the image-side surface S8 is a concave surface, and both the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are aspheric.
The fifth lens element E5 has positive refractive power, the object-side surface S9 is concave, the image-side surface S10 is convex, and both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 are aspheric.
The sixth lens element E6 has negative refractive power, and has a concave object-side surface S11 and a concave image-side surface S12, and both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Optionally, the optical imaging lens may further include a filter E7 having an object side surface S13 and an image side surface S14. The light from the object passes through the respective surfaces S1 to S14 in order and is finally imaged on the imaging plane S15.
Optionally, a stop STO may be disposed between the first lens E1 and the second lens E2 to further improve the imaging quality of the lens.
Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the optical imaging lens of example 7, wherein the unit of the radius of curvature and the thickness are both millimeters (mm). Table 20 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above. Table 21 shows effective focal lengths f1 to f6 of the respective lenses, a total effective focal length f of the optical imaging lens, an optical total length TTL of the optical imaging lens, and a half ImgH of a diagonal length of an effective pixel area on the imaging surface S15 of the optical imaging lens in example 7.
Figure GDA0001584501340000241
Figure GDA0001584501340000251
Watch 19
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -8.2163E-03 4.7778E-02 -1.5359E-01 3.1270E-01 -4.1804E-01 3.6276E-01 -1.9706E-01 6.0683E-02 -8.1171E-03
S2 -8.2891E-02 3.8899E-01 -9.8901E-01 1.7470E+00 -2.1956E+00 1.9076E+00 -1.0824E+00 3.5878E-01 -5.2551E-02
S3 -1.7995E-01 5.8990E-01 -1.3580E+00 2.3768E+00 -3.0203E+00 2.7006E+00 -1.6002E+00 5.6347E-01 -8.9270E-02
S4 -1.0856E-01 1.8610E-01 2.2088E-01 -2.1842E+00 6.3788E+00 -1.0219E+01 9.5642E+00 -4.8971E+00 1.0655E+00
S5 -7.8082E-02 7.9847E-02 -4.0847E-01 1.0240E+00 -1.6081E+00 1.3510E+00 -3.9842E-01 -1.7467E-01 1.1195E-01
S6 -1.3982E-01 -3.0139E-02 2.6502E-01 -6.4907E-01 7.3669E-01 -4.9018E-01 2.0741E-01 -5.1297E-02 4.5966E-03
S7 -2.2309E-01 1.1855E-01 -3.2774E-01 1.1586E+00 -2.3043E+00 2.4827E+00 -1.4824E+00 4.6915E-01 -6.2488E-02
S8 -1.5787E-01 2.9574E-02 -4.1876E-02 2.6687E-01 -5.0897E-01 4.7292E-01 -2.3936E-01 6.4224E-02 -7.1981E-03
S9 -1.3250E-02 -6.5640E-02 6.0150E-03 8.1440E-02 -1.0213E-01 6.0359E-02 -2.0214E-02 3.8287E-03 -3.2400E-04
S10 -9.0615E-02 1.0629E-01 -1.5028E-01 1.3025E-01 -6.0855E-02 1.6296E-02 -2.5448E-03 2.1866E-04 -8.1571E-06
S11 -1.1954E-01 1.9865E-02 1.0517E-02 2.2858E-03 -4.0042E-03 1.3397E-03 -2.1288E-04 1.7036E-05 -5.5513E-07
S12 -9.8764E-02 5.3664E-02 -2.4681E-02 8.8794E-03 -2.4112E-03 4.6130E-04 -5.7971E-05 4.2578E-06 -1.3656E-07
Watch 20
Figure GDA0001584501340000252
TABLE 21
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 7, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 7. Fig. 14C shows a distortion curve of the optical imaging lens of embodiment 7, which represents the distortion magnitude values in the case of different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the optical imaging lens of embodiment 7, which represents a deviation of different image heights on the imaging surface after light passes through the lens. As can be seen from fig. 14A to 14D, the optical imaging lens according to embodiment 7 can achieve good imaging quality.
In conclusion, examples 1 to 7 each satisfy the relationship shown in table 22 below.
Figure GDA0001584501340000253
Figure GDA0001584501340000261
TABLE 22
The present application also provides an imaging device whose electron photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention according to the present application is not limited to the specific combination of the above-mentioned features, but also covers other embodiments where any combination of the above-mentioned features or their equivalents is made without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (10)

1. The optical imaging lens sequentially comprises from an object side to an image side along an optical axis: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, and a sixth lens element,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has positive optical power;
the fourth lens has optical power;
the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface;
the sixth lens has negative focal power, and both the object side surface and the image side surface of the sixth lens are concave;
the number of lenses having focal power in the optical imaging lens is six;
the central thickness CT2 of the second lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis satisfy 4 < CT2/T12 < 6; and
the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens meet the condition that f/EPD is less than or equal to 1.6.
2. The optical imaging lens of claim 1, wherein an on-axis distance TTL from an object-side surface of the first lens element to an imaging surface of the optical imaging lens and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens satisfy TTL/ImgH ≦ 1.5.
3. The optical imaging lens of claim 1, wherein an effective focal length f1 of the first lens and a center thickness CT1 of the first lens on the optical axis satisfy 3 < f1/CT1 < 4.
4. The optical imaging lens of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy 1.5 < R3/R4 < 2.5.
5. The optical imaging lens according to any one of claims 1 or 4, wherein the effective focal length f2 of the second lens and the total effective focal length f of the optical imaging lens satisfy-2 < f2/f < -1.
6. The optical imaging lens of claim 1, wherein the radius of curvature of the object-side surface of the fourth lens R7 and the radius of curvature of the image-side surface of the fourth lens R8 satisfy-1 < (R7-R8)/(R7 + R8) < 2.
7. The optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy-3 < f/R10 < -2.5.
8. The optical imaging lens according to claim 1 or 7, wherein the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging lens satisfy 0.5 < f5/f < 1.
9. The optical imaging lens assembly as claimed in claim 1, wherein the radius of curvature R11 of the object-side surface of the sixth lens element and the radius of curvature R12 of the image-side surface of the sixth lens element satisfy-2 < R11/R12 < -1.5.
10. The optical imaging lens of any one of claims 1 to 4, wherein a sum Σ CT of central thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens on the optical axis, respectively, and an on-axis distance TTL from an object side surface of the first lens to an imaging surface of the optical imaging lens satisfy 0.5 < ΣCT/TTL < 0.7.
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