CN114706199B - Optical imaging lens - Google Patents

Optical imaging lens Download PDF

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Publication number
CN114706199B
CN114706199B CN202210486025.1A CN202210486025A CN114706199B CN 114706199 B CN114706199 B CN 114706199B CN 202210486025 A CN202210486025 A CN 202210486025A CN 114706199 B CN114706199 B CN 114706199B
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lens
optical imaging
optical
image
imaging lens
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CN114706199A (en
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厉宏兰
贺凌波
赵烈烽
戴付建
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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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
    • 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
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

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

Abstract

The application discloses optical imaging lens, it includes in order from the object side to the image side along the optical axis: a first lens having negative optical power, the image side of which is concave; a second lens having positive optical power; a third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens with positive focal power, wherein the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is convex; an eighth lens having negative optical power; wherein the number of lenses having optical power in the optical imaging lens is eight; at least two of the first to eighth lenses are glass lenses; and a radius of curvature R14 of an image side surface of the seventh lens and a center thickness CT7 of the seventh lens on the optical axis satisfy: -31.0 < R14/CT7 < -18.5.

Description

Optical imaging lens
Technical Field
The present application relates to the field of optical elements, and in particular, to an optical imaging lens.
Background
Along with the continuous maturation of the technology of optical imaging lens, the long-focus optical imaging lens gradually evolves from fixed focus and digital mixed zooming to continuous optical zooming. The optical imaging lens with continuous optical zooming has longer shooting distance, more real details are embodied, and the optical imaging lens with continuous optical zooming has a multi-multiplying power focusing function, can be applied to various electronic products such as mobile phone lenses and unmanned aerial vehicles, and meets shooting requirements of different clients. However, the long-focus optical imaging lens is generally large in size, low in assembly yield and difficult to achieve miniaturization, so that designing an eight-lens optical imaging lens with long focal length, high imaging quality, ultra-thin performance, good processing characteristics and the like becomes one of the main research and development hot spots in the field of current lenses.
Disclosure of Invention
The present application provides an optical imaging lens including, in order from an object side to an image side along an optical axis: a first lens having negative optical power, the image side of which is concave; a second lens having positive optical power; a third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens with positive focal power, wherein the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is convex; an eighth lens having negative optical power; wherein the number of lenses having optical power in the optical imaging lens is eight; at least two of the first lens to the eighth lens are glass lenses; and the curvature radius R14 of the image side surface of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis satisfy: -31.0 < R14/CT7 < -18.5.
In one embodiment, the radius of curvature R13 of the object side surface of the seventh lens, the air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: R13/T67 is more than 10.5 and less than 20.5.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R15 of the object-side surface of the eighth lens, and the effective focal length f4 of the fourth lens satisfy: 4.5 < |R1×R5/(f4×R15) | < 25.0.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R15 of the object-side surface of the eighth lens satisfy: -2.5 < R15/R7 < -1.0.
In one embodiment, the radius of curvature R3 of the object side surface of the second lens and the center thickness CT3 of the third lens on the optical axis satisfy: R3/CT3 is more than 3.5 and less than 10.0.
In one embodiment, the air interval T56 of the fifth lens and the sixth lens on the optical axis and the effective focal length f5 of the fifth lens satisfy: -10.0 < f5/T56 < -4.5.
In one embodiment, the on-axis distance TD from the object side surface of the first lens element to the image side surface of the eighth lens element, the center thickness CT4 of the fourth lens element on the optical axis, and the center thickness CT8 of the eighth lens element on the optical axis satisfy: 4.5 < TD/(CT4+CT8) < 6.5.
In one embodiment, the sum Σat of the radius of curvature R10 of the image side surface of the fifth lens, the air interval on the optical axis between any adjacent two lenses among the first lens to the eighth lens satisfies: R10/ΣAT < 1.5 < 3.0.
In one embodiment, the sum Σct of the center thicknesses of the first to eighth lenses on the optical axis and the effective focal length f6 of the sixth lens satisfy: 2.0 < f6/ΣCT < 4.5.
In one embodiment, the radius of curvature R8 of the image side surface of the fourth lens, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: -7.0 < R8/(CT5+T56+CT6) < -4.0.
The application includes eight lenses, through reasonable distribution focal power and optimization optical parameter, has the shooting distance that is bigger than conventional long burnt camera lens, can cooperate the module motor to carry out continuous optics zoom, and including two piece at least glass lenses, can promote the resolution power of optical imaging lens and reduce the reliability problem, control the center thickness of seventh lens, reduce the processing degree of difficulty for the optical imaging lens of this application has at least long focus, the good beneficial effect of at least one such as good processing characteristic of imaging quality, can satisfy the application demand of main camera on the high-end smart mobile phone in the future betterly.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 shows a schematic configuration diagram of an optical imaging lens according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 1;
fig. 3 shows a schematic structural view of an optical imaging lens according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 2;
fig. 5 shows a schematic structural view of an optical imaging lens according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 3;
fig. 7 shows a schematic structural diagram of 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 magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 4;
fig. 9 shows a schematic structural view of 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 magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 5;
fig. 11 shows a schematic structural view of an optical imaging lens according to embodiment 6 of the present application; and
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens of embodiment 6.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The optical imaging lens according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Any two adjacent lenses from the first lens to the eighth lens can have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have negative optical power, the image side of which is concave; the second lens may have positive optical power; the third lens may have positive optical power; the fourth lens may have positive optical power; the fifth lens may have negative optical power; the sixth lens may have positive optical power; the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the eighth lens may have negative optical power. The number of lenses with focal power in the optical imaging lens is eight, the imaging distance is larger than that of a conventional long-focus lens, the continuous optical zooming can be carried out by matching with a module motor, at least two of the first lens to the eighth lens are glass lenses, and the resolution of the system can be improved, and the reliability problem can be reduced. By reasonably distributing the positive and negative focal power of each lens of the optical imaging lens, the low-order aberration of the optical imaging lens can be effectively balanced and controlled, the sensitivity of tolerance can be reduced, and the miniaturization of the optical imaging lens is maintained.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -31.0 < R14/CT7 < -18.5, wherein R14 is the radius of curvature of the image side of the seventh lens and CT7 is the central thickness of the seventh lens on the optical axis. More specifically, R14 and CT7 may further satisfy: -30.81 < R14/CT7 < -18.80. Satisfies R14/CT7 < -18.5 being less than-31.0, is favorable for avoiding the excessive bending of the seventh lens, and simultaneously, controls the center thickness CT7 of the seventh lens, thereby being favorable for reducing the processing and forming difficulty.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 10.5 < R13/T67 < 20.5, wherein R13 is the radius of curvature of the object side of the seventh lens, and T67 is the air separation of the sixth lens and the seventh lens on the optical axis. More specifically, R13 and T67 may further satisfy: R13/T67 is more than 10.65 and less than 20.22. The R13/T67 is less than 20.5 and more than 10.5, the seventh lens is prevented from being excessively bent, and the air interval between the sixth lens and the seventh lens on the optical axis is controlled, so that the optical imaging lens group has better capability of balancing chromatic aberration and distortion.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 4.5 < |R1×R5/(f4×R15) | < 25.0, where R1 is the radius of curvature of the object side of the first lens, R5 is the radius of curvature of the object side of the third lens, R15 is the radius of curvature of the object side of the eighth lens, and f4 is the effective focal length of the fourth lens. More specifically, R1, R5, f4, and R15 may further satisfy: 4.78 < |R1×R5/(f4×R15) | < 23.42. Satisfies 4.5 < |R1×R5/(f4×R15) | < 25.0, is favorable for avoiding the excessive bending of the first lens and the third lens, reducing the processing forming difficulty, and improving the field curvature and distortion of the optical imaging lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -2.5 < R15/R7 < -1.0, wherein R7 is the radius of curvature of the object-side surface of the fourth lens and R15 is the radius of curvature of the object-side surface of the eighth lens. More specifically, R15 and R7 may further satisfy: -2.33 < R15/R7 < -1.26. Satisfies R15/R7 < -1.0, reasonably controls the ratio range of the curvature radius of the object side surface of the fourth lens and that of the eighth lens, is favorable for ensuring that the fourth lens has proper focal power, reduces the included angle between the principal ray and the optical axis when the principal ray is incident on the image plane, and improves the illuminance of the image plane.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 3.5 < R3/CT3 < 10.0, wherein R3 is the radius of curvature of the object side of the second lens, and CT3 is the center thickness of the third lens on the optical axis. More specifically, R3 and CT3 may further satisfy: R3/CT3 is more than 3.83 and less than 9.51. Satisfies R3/CT3 less than 10.0 and is favorable for avoiding the second lens from being excessively bent, controlling the center thickness of the third lens and reducing the processing and forming difficulty.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -10.0 < f5/T56 < -4.5, wherein T56 is the air separation of the fifth lens and the sixth lens on the optical axis and f5 is the effective focal length of the fifth lens. More specifically, f5 and T56 further satisfy: -9.76 < f5/T56 < -4.51. Meets the condition that f5/T56 is less than-10.0 and less than-4.5, is beneficial to improving the light converging capacity of the optical imaging lens, adjusting the focusing position of the light and shortening the total length of the optical imaging lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 4.5 < TD/(CT4+CT8) < 6.5, wherein TD is the on-axis distance from the object side surface of the first lens to the image side surface of the eighth lens, CT4 is the center thickness of the fourth lens on the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis. More specifically, TD, CT4, and CT8 may further satisfy: 4.76 < TD/(CT4+CT8) < 6.07. The total length of the optical imaging lens can be effectively controlled by satisfying the requirement that TD/(CT4+CT8) < 6.5, and the central thicknesses of the fourth lens and the eighth lens are controlled at the same time, so that the structure of the optical imaging lens is adjusted, and the difficulty in lens processing and assembly is reduced.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < R10/ΣAT < 3.0, wherein R10 is the radius of curvature of the image side surface of the fifth lens element, ΣAT is the sum of the air intervals on the optical axis between any adjacent two lens elements in the first lens to eighth lens element. More specifically, R10 and Σat may further satisfy: R10/ΣAT < 1.57 < 2.56. Satisfies R10/Sigma AT < 3.0, is favorable for reasonably controlling the air interval of the optical imaging lens, ensures the processability of the optical imaging lens, reduces the optical sensitivity and improves the yield.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.0 < f6/Σct < 4.5, where Σct is the sum of the central thicknesses of the first lens to the eighth lens on the optical axis, and f6 is the effective focal length of the sixth lens. More specifically, f6 and Σct may further satisfy: 2.38 < f6/ΣCT < 4.5. Satisfies 2.0 < f6/ΣCT < 4.5, reasonably distributes the focal power of the sixth lens, reasonably controls the center thickness of the optical lens, can reduce the optical sensitivity and improves the yield.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -7.0 < R8/(ct5+t56+ct6) < -4.0, where R8 is the radius of curvature of the image side surface of the fourth lens, CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and T56 is the air gap of the fifth lens and the sixth lens on the optical axis. More specifically, R8, CT5, T56, and CT6 may further satisfy: -6.53 < R8/(CT5+T56+CT6) < -4.34. The lens meets R8/(CT5+T56+CT6) < -4.0, is favorable for avoiding the fourth lens from being excessively bent, reduces the processing and forming difficulty, and simultaneously controls the center thickness of the fifth lens and the sixth lens and the air interval of the fifth lens and the sixth lens on the optical axis, thereby being favorable for shortening the total length of the optical imaging lens.
In an exemplary embodiment, half of the diagonal length ImgH of the effective pixel region on the imaging surface of the optical imaging lens satisfies: imgH > 2.0mm, illustratively, imgH may be equal to 2.80mm.
In an exemplary embodiment, the distance TTL on the optical axis from the object side surface to the imaging surface of the first lens may be, for example, in the range of 25.99mm to 30.01 mm.
In an exemplary embodiment, half of the maximum field angle of the optical imaging lens may be, for example, in the range of 5.4 ° to 6.2 °.
In an exemplary embodiment, the effective focal length f of the optical imaging lens may be, for example, in the range of 25.99mm to 29.01mm, the effective focal length f1 of the first lens may be, for example, in the range of-13.33 mm to-12.03 mm, the effective focal length f2 of the second lens may be, for example, in the range of 26.06mm to 37.41mm, the effective focal length f3 of the third lens may be, for example, in the range of 9.68mm to 17.86mm, the effective focal length f4 of the fourth lens may be, for example, in the range of 8.08mm to 20.20mm, the effective focal length f5 of the fifth lens may be, for example, in the range of-10.45 mm to-7.57 mm, the effective focal length f6 of the sixth lens may be, for example, in the range of 22.52mm to 43.06mm, the effective focal length f7 of the seventh lens may be, for example, in the range of 14.59mm to 20.99mm, and the effective focal length f8 of the eighth lens may be, for example, in the range of-11.21 to-8.72 mm.
In an exemplary embodiment, the optical imaging lens may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface. The application provides an optical imaging lens with the characteristics of miniaturization, large image surface, large aperture, high imaging quality and the like. The optical imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the above eight lenses. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, incident light rays can be effectively converged, the optical total length of the imaging lens is reduced, and the processability of the imaging lens is improved, so that the optical imaging lens is more beneficial to production and processing.
In the embodiments of the present application, at least one of the mirrors of each lens is an aspherical mirror, that is, at least one of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are aspherical mirror surfaces. Optionally, the object side surfaces and the image side surfaces of the first lens, the fourth lens, the sixth lens, the seventh lens and the eighth lens are aspheric mirror surfaces, and the object side surfaces and the image side surfaces of the second lens, the third lens and the fifth lens are spherical mirror surfaces.
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
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 configuration 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 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, a seventh lens E7, an eighth lens E8, an optical filter E9, and an imaging surface S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 1 shows the basic parameter table of the optical imaging lens of embodiment 1, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm).
TABLE 1
In this example, the effective focal length f of the optical imaging lens is 27.50mm, the total length TTL of the optical imaging lens (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19 of the optical imaging lens) is 28.00mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the optical imaging lens is 2.80mm, and half of the maximum field angle Semi-FOV of the optical imaging lens is 5.8 °.
In embodiment 1, the object side surface and the image side surface of the first lens element E1, the fourth lens element E4, the sixth lens element E6, the seventh lens element E7 and the eighth lens element E8 are aspheric, and the surface profile x of each aspheric lens element 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. Table 2 shows the higher order coefficients A that can be used for the aspherical mirror surfaces S1, S2, S7, S8, S11-S16 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
TABLE 2
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 1, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 2B shows an astigmatism curve of the optical imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the optical imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the optical imaging lens provided in 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 portions similar to embodiment 1 will be omitted for 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 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, a seventh lens E7, an eighth lens E8, an optical filter E9, and an imaging surface S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the effective focal length f of the optical imaging lens is 26.00mm, the total length TTL of the optical imaging lens is 28.00mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the optical imaging lens is 2.80mm, and half the maximum field angle Semi-FOV of the optical imaging lens is 6.1 °.
Table 3 shows the basic parameter table of the optical imaging lens of embodiment 2, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Table 4 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 3 Table 3
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.4171E-01 1.7349E-02 -2.9004E-03 3.4199E-04 -3.2935E-05 2.7935E-05 -1.6276E-05 5.5403E-06 -8.9943E-07
S2 -1.9739E-01 1.8140E-02 -3.4744E-03 4.0121E-04 -4.9442E-05 4.8192E-05 -2.6176E-05 8.9610E-06 -1.6037E-06
S7 -3.6263E-02 -7.4489E-03 -5.5410E-04 -4.5675E-04 -1.3460E-04 1.1499E-04 -5.0901E-05 4.6205E-07 1.1604E-06
S8 4.1532E-02 -7.1149E-03 -4.1381E-04 -2.4146E-04 -1.4551E-04 1.4610E-04 -1.0119E-04 3.8223E-05 -3.5641E-06
S11 -9.0913E-04 -4.4798E-03 -1.8308E-03 3.0288E-04 -2.2601E-04 7.3659E-05 -5.5959E-05 2.7179E-05 -1.4735E-06
S12 3.8016E-02 -6.2515E-03 -2.2806E-03 4.5164E-04 -1.2910E-04 1.8709E-04 4.8698E-05 6.5068E-05 -1.2358E-05
S13 7.0049E-02 -2.7302E-03 2.9255E-05 4.4040E-05 2.4206E-05 -2.6285E-05 -2.6286E-05 1.3378E-05 -1.0206E-06
S14 8.4385E-02 -5.8083E-03 1.5530E-04 -2.4418E-04 -7.0680E-05 -8.1421E-05 3.4747E-05 4.5461E-05 -4.9934E-06
S15 -8.8497E-02 -1.9248E-03 1.6409E-04 -6.4442E-05 2.4477E-04 1.2285E-04 1.0046E-04 9.2726E-06 -8.9259E-06
S16 -1.3440E-01 8.7143E-04 -2.6320E-04 2.5964E-04 2.0695E-04 1.7243E-05 -2.4434E-05 -3.5607E-05 -7.2882E-06
TABLE 4 Table 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which indicates the deviation of the converging focus after light rays of different wavelengths pass through the lens. Fig. 4B shows an astigmatism curve of the optical imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a magnification chromatic aberration 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 provided in 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 diagram 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 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, a seventh lens E7, an eighth lens E8, an optical filter E9, and an imaging surface S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the effective focal length f of the optical imaging lens is 26.45mm, the total length TTL of the optical imaging lens is 26.00mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the optical imaging lens is 2.80mm, and half the maximum field angle Semi-FOV of the optical imaging lens is 6.0 °.
Table 5 shows the basic parameter table of the optical imaging lens of embodiment 3, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 5
TABLE 6
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the optical imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the optical imaging lens provided in 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 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, a seventh lens E7, an eighth lens E8, an optical filter E9, and an imaging surface S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the effective focal length f of the optical imaging lens is 29.00mm, the total length TTL of the optical imaging lens is 30.00mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the optical imaging lens is 2.80mm, and half the maximum field angle Semi-FOV of the optical imaging lens is 5.5 °.
Table 7 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 7
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.4116E-01 1.6850E-02 -2.6833E-03 4.2546E-04 -3.9511E-05 2.6350E-05 -3.0884E-05 1.2231E-05 -1.6370E-06
S2 -1.9692E-01 1.7470E-02 -3.2863E-03 5.3082E-04 -4.4281E-05 2.0594E-05 -3.5600E-05 1.6506E-05 -2.4801E-06
S7 -4.4486E-02 -7.5916E-03 -1.2020E-03 -9.6207E-04 -2.8770E-04 -2.5808E-04 -6.0284E-05 7.6971E-06 3.9193E-07
S8 4.3188E-02 -5.2457E-03 -9.7852E-04 -7.2703E-04 -1.8346E-04 -1.2772E-04 2.4462E-05 1.4460E-05 -3.0598E-06
S11 2.7812E-03 -5.3672E-03 -7.0312E-04 3.9413E-05 -5.3672E-04 1.4413E-04 3.7236E-05 1.8921E-06 3.5718E-06
S12 2.8772E-02 -1.0327E-02 2.8909E-04 -1.3570E-04 -5.1623E-04 2.9080E-04 4.9256E-05 1.4819E-06 4.2482E-06
S13 6.2174E-02 -9.8118E-03 9.1217E-04 1.2645E-04 4.6460E-07 -3.4345E-05 1.1832E-05 -1.2080E-06 4.3728E-08
S14 7.8326E-02 -1.5072E-02 2.3357E-03 1.4747E-04 -8.8860E-05 -3.6273E-05 4.9160E-05 -1.2313E-05 1.3681E-06
S15 -1.0608E-01 3.1166E-03 -4.8574E-05 1.1385E-04 -4.2258E-05 -1.3746E-05 2.0806E-05 -8.5892E-06 1.1876E-06
S16 -1.5998E-01 9.7621E-03 -1.1599E-03 1.5649E-04 -8.3506E-05 1.0405E-05 -2.6963E-06 -3.4275E-06 5.3585E-06
TABLE 8
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve of the optical imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a magnification chromatic aberration 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 provided in 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 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, a seventh lens E7, an eighth lens E8, an optical filter E9, and an imaging surface S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the effective focal length f of the optical imaging lens is 27.83mm, the total length TTL of the optical imaging lens is 29.00mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the optical imaging lens is 2.80mm, and half the maximum field angle Semi-FOV of the optical imaging lens is 5.7 °.
Table 9 shows a basic parameter table of the optical imaging lens of embodiment 5, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 9
Table 10
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 5, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve of the optical imaging lens of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the optical imaging lens provided in 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 diagram 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 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, a seventh lens E7, an eighth lens E8, an optical filter E9, and an imaging surface S19.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S15 and a concave image-side surface S16. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
In this example, the effective focal length f of the optical imaging lens is 27.00mm, the total length TTL of the optical imaging lens is 27.00mm, half the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the optical imaging lens is 2.80mm, and half the maximum field angle Semi-FOV of the optical imaging lens is 5.9 °.
Table 11 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of radius of curvature, thickness/distance, and effective focal length are all millimeters (mm). Table 12 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 11
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.5315E-01 1.3814E-02 -1.6377E-03 3.1078E-04 -7.5777E-05 3.0767E-05 -2.4357E-05 1.2510E-05 -3.7889E-06
S2 -1.8595E-01 1.9636E-02 -2.6709E-03 4.1765E-04 -2.1852E-04 -1.4870E-05 -6.5004E-05 2.6084E-06 -1.9786E-05
S7 -4.1261E-02 -2.8718E-02 2.2561E-03 2.0916E-03 1.5206E-03 -4.5857E-04 -8.6211E-04 -4.3791E-04 -1.3076E-04
S8 1.6493E-02 2.1339E-03 -5.7046E-03 -3.1646E-03 2.4985E-03 -2.5511E-05 -1.5980E-04 -4.4400E-04 -2.6542E-04
S11 8.8051E-03 -5.4328E-03 -1.3859E-03 -2.4900E-03 1.3317E-03 4.1058E-04 2.4568E-04 1.0703E-04 5.0900E-05
S12 2.7366E-02 -8.8478E-03 -2.9028E-04 -4.3169E-04 1.4850E-03 -1.6219E-03 2.3765E-04 4.8052E-04 2.7762E-04
S13 5.9158E-02 -9.5807E-03 1.4433E-03 -1.0654E-03 3.5837E-04 -1.2908E-04 8.0487E-05 -8.0564E-06 -1.0538E-06
S14 8.2160E-02 -1.1761E-02 1.6489E-03 -8.2758E-04 7.5175E-04 -3.2957E-05 1.3577E-04 -5.7540E-05 -6.4218E-06
S15 -9.5536E-02 3.1357E-03 2.0299E-04 -3.1931E-04 1.2772E-04 -1.0751E-04 -1.9036E-05 -4.8470E-05 3.2319E-06
S16 -1.7265E-01 5.2900E-03 -1.2906E-03 -3.4630E-04 -9.5724E-05 -4.0258E-05 2.7769E-05 2.0602E-05 1.5697E-05
Table 12
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the optical imaging lens of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a magnification chromatic aberration curve of the optical imaging lens of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the optical imaging lens provided in embodiment 6 can achieve good imaging quality.
In summary, examples 1 to 6 satisfy the relationships shown in table 13, respectively.
TABLE 13
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (10)

1. An optical imaging lens, comprising, in order from an object side to an image side along an optical axis:
a first lens having negative optical power, the image side of which is concave;
a second lens with positive focal power, the object side surface of which is convex, and the image side surface of which is concave;
a third lens having positive optical power, the object side of which is convex;
a fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a fifth lens with negative focal power, the object side surface of which is concave, and the image side surface of which is concave;
a sixth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a seventh lens with positive focal power, wherein the object side surface of the seventh lens is convex, and the image side surface of the seventh lens is convex; and
an eighth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; wherein,
the number of lenses having optical power in the optical imaging lens is eight;
at least two of the first to eighth lenses are glass lenses; and
the curvature radius R14 of the image side surface of the seventh lens and the center thickness CT7 of the seventh lens on the optical axis satisfy: -31.0 < R14/CT7 < -18.5;
the effective focal length f of the optical imaging lens is in the range of 25.99mm to 29.01 mm.
2. The optical imaging lens according to claim 1, wherein a radius of curvature R13 of an object side surface of the seventh lens, an air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: R13/T67 is more than 10.5 and less than 20.5.
3. The optical imaging lens according to claim 1, wherein a radius of curvature R1 of an object side of the first lens, a radius of curvature R5 of an object side of the third lens, a radius of curvature R15 of an object side of the eighth lens, and an effective focal length f4 of the fourth lens satisfy: 4.5 < |R1×R5/(f4×R15) | < 25.0.
4. The optical imaging lens according to claim 1, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R15 of an object side surface of the eighth lens satisfy: -2.5 < R15/R7 < -1.0.
5. The optical imaging lens according to claim 1, wherein a radius of curvature R3 of an object side surface of the second lens and a center thickness CT3 of the third lens on the optical axis satisfy: R3/CT3 is more than 3.5 and less than 10.0.
6. The optical imaging lens according to claim 1, wherein an air interval T56 of the fifth lens and the sixth lens on the optical axis and an effective focal length f5 of the fifth lens satisfy: -10.0 < f5/T56 < -4.5.
7. The optical imaging lens according to claim 1, wherein an on-axis distance TD from an object side surface of the first lens to an image side surface of the eighth lens, a center thickness CT4 of the fourth lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: 4.5 < TD/(CT4+CT8) < 6.5.
8. The optical imaging lens according to claim 1, wherein a sum Σat of a curvature radius R10 of an image side surface of the fifth lens, an air interval on the optical axis between any adjacent two lenses of the first to eighth lenses satisfies: R10/ΣAT < 1.5 < 3.0.
9. The optical imaging lens according to claim 1, wherein a sum Σct of center thicknesses of the first to eighth lenses on the optical axis and an effective focal length f6 of the sixth lens satisfy: 2.0 < f6/ΣCT < 4.5.
10. The optical imaging lens according to claim 1, wherein a radius of curvature R8 of an image side surface of the fourth lens, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and an air interval T56 of the fifth lens and the sixth lens on the optical axis satisfy: -7.0 < R8/(CT5+T56+CT6) < -4.0.
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CN216013794U (en) * 2021-09-09 2022-03-11 东莞市宇瞳光学科技股份有限公司 Fixed focus lens

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