CN113267879B - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN113267879B CN113267879B CN202110584807.4A CN202110584807A CN113267879B CN 113267879 B CN113267879 B CN 113267879B CN 202110584807 A CN202110584807 A CN 202110584807A CN 113267879 B CN113267879 B CN 113267879B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The application discloses an optical imaging lens, which sequentially comprises from an object side to an image side along an optical axis: a diaphragm; a first lens having an optical power; a second lens having a positive optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having a negative optical power; a seventh lens having positive optical power; and an eighth lens having optical power. At least one mirror surface of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical mirror surface. The half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens satisfies: imgH > 8.0mm.
Description
Technical Field
The application relates to the field of optical elements, in particular to an optical imaging lens.
Background
With the rapid development of miniaturized electronic products such as smart phones, users have more and more diverse requirements on the photographing function of the smart phones and the like, and have more and more high requirements on the imaging quality of optical imaging lenses carried on the smart phones. Meanwhile, manufacturers of miniaturized electronic products such as smart phones have increasingly strict requirements on specifications of optical imaging lenses and have increasingly high requirements on performance of electric coupling devices or complementary metal oxide semiconductor image sensors. Therefore, how to make the optical imaging lens more compatible with larger chips; how to make the optical imaging lens have the characteristics of ultra-thin, shorter length and the like; how to make the optical imaging lens better balance aberration such as chromatic aberration and distortion has become the main development direction for various lens manufacturers to improve their competitiveness.
Disclosure of Invention
The present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a diaphragm; a first lens having an optical power; a second lens having positive optical power; a third lens having a focal power; a fourth lens having a focal power; a fifth lens having a focal power; a sixth lens having a negative optical power; a seventh lens having positive optical power; and an eighth lens having optical power. At least one mirror surface of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical mirror surface. The half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens can satisfy: imgH > 8.0mm.
In one embodiment, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the optical imaging lens may satisfy: f12/f is more than 2.0 and less than 3.0.
In one embodiment, the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens may satisfy: -3.5 < f6/f3 < -1.0.
In one embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens may satisfy: -2.0 < f7/f8 < -1.0.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy: R2/R1 is more than 2.0 and less than 2.5.
In one embodiment, the radius of curvature R4 of the object-side surface of the third lens and the radius of curvature R7 of the image-side surface of the fourth lens may satisfy: 2.5 < R7/R4 < 4.5.
In one embodiment, the radius of curvature R8 of the object-side surface of the fifth lens and the radius of curvature R9 of the image-side surface of the fifth lens may satisfy: R8/R9 is more than 0.5 and less than 6.5.
In one embodiment, a radius of curvature R10 of an object-side surface of the sixth lens element and a radius of curvature R11 of an image-side surface of the sixth lens element may satisfy: R10/R11 is more than 1.0 and less than 2.0.
In one embodiment, the total effective focal length f of the optical imaging lens and the radius of curvature R12 of the object side surface of the seventh lens may satisfy: f/R12 is more than 1.0 and less than 2.5.
In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis may satisfy: CT1/CT2 is more than 3.0 and less than 4.5.
In one embodiment, a separation distance T23 of the second lens and the third lens on the optical axis and a separation distance T34 of the third lens and the fourth lens on the optical axis may satisfy: T34/T23 is more than 1.5 and less than 2.5.
In one embodiment, a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a separation distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy: T56/T45 is more than 1.0 and less than 3.5.
In one embodiment, the separation distance T78 between the seventh lens and the eighth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, and the central thickness CT8 of the eighth lens on the optical axis may satisfy: T78/(CT 7+ CT 8) < 2.5 < 1.5.
In one embodiment, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, and a central thickness CT6 of the sixth lens on the optical axis may satisfy: 2.0 < (CT 4+ CT 5)/CT 6 < 3.0.
In one embodiment, the abbe number V1 of the first lens and the abbe number V2 of the second lens may satisfy: V1-V2 are more than 30 and less than 40.
In one embodiment, the refractive index N1 of the first lens and the refractive index N2 of the second lens may satisfy: N2-N1 is more than 0.2.
In one embodiment, the first lens and the second lens are cemented to form a cemented lens.
In one embodiment, the first lens and the second lens are glass lenses.
In one embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy: f/EPD < 2.0.
In one embodiment, the maximum field angle FOV of the optical imaging lens may satisfy: the FOV is more than or equal to 80 degrees.
Another aspect of the present application provides an optical imaging lens, in order from an object side to an image side along an optical axis, comprising: a diaphragm; a first lens having an optical power; a second lens having positive optical power; a third lens having optical power; a fourth lens having an optical power; a fifth lens having optical power; a sixth lens having a negative refractive power; a seventh lens having positive optical power; and an eighth lens having a focal power. At least one mirror surface of the object side surface of the first lens to the image side surface of the eighth lens is an aspherical mirror surface. The effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens can satisfy: -3.5 < f6/f3 < -1.0.
In one embodiment, the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the optical imaging lens may satisfy: f12/f is more than 2.0 and less than 3.0.
In one embodiment, the refractive index N1 of the first lens and the refractive index N2 of the second lens may satisfy: N2-N1 > 0.2.
In one embodiment, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens may satisfy: -2.0 < f7/f8 < -1.0.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy: R2/R1 is more than 2.0 and less than 2.5.
In one embodiment, the radius of curvature R4 of the object-side surface of the third lens and the radius of curvature R7 of the image-side surface of the fourth lens may satisfy: 2.5 < R7/R4 < 4.5.
In one embodiment, a radius of curvature R8 of the object-side surface of the fifth lens element and a radius of curvature R9 of the image-side surface of the fifth lens element may satisfy: R8/R9 is more than 0.5 and less than 6.5.
In one embodiment, a radius of curvature R10 of an object-side surface of the sixth lens element and a radius of curvature R11 of an image-side surface of the sixth lens element may satisfy: R10/R11 is more than 1.0 and less than 2.0.
In one embodiment, the total effective focal length f of the optical imaging lens and the radius of curvature R12 of the object side surface of the seventh lens may satisfy: f/R12 is more than 1.0 and less than 2.5.
In one embodiment, the central thickness CT1 of the first lens on the optical axis and the central thickness CT2 of the second lens on the optical axis may satisfy: CT1/CT2 is more than 3.0 and less than 4.5.
In one embodiment, a distance T23 between the second lens and the third lens on the optical axis and a distance T34 between the third lens and the fourth lens on the optical axis may satisfy: T34/T23 is more than 1.5 and less than 2.5.
In one embodiment, a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a separation distance T56 between the fifth lens and the sixth lens on the optical axis may satisfy: T56/T45 is more than 1.0 and less than 3.5.
In one embodiment, the separation distance T78 between the seventh lens and the eighth lens on the optical axis, the central thickness CT7 of the seventh lens on the optical axis, and the central thickness CT8 of the eighth lens on the optical axis may satisfy: T78/(CT 7+ CT 8) < 2.5 < 1.5.
In one embodiment, a central thickness CT4 of the fourth lens on the optical axis, a central thickness CT5 of the fifth lens on the optical axis, and a central thickness CT6 of the sixth lens on the optical axis may satisfy: 2.0 < (CT 4+ CT 5)/CT 6 < 3.0.
In one embodiment, the abbe number V1 of the first lens and the abbe number V2 of the second lens may satisfy: V1-V2 are more than 30 and less than 40.
In one embodiment, the first lens and the second lens are cemented to form a cemented lens.
In one embodiment, the first lens and the second lens are glass lenses.
In one embodiment, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens may satisfy: f/EPD < 2.0.
In one embodiment, the maximum field angle FOV of the optical imaging lens may satisfy: the FOV is more than or equal to 80 degrees.
This application adopts eight lens, through the focal power of rational distribution each lens, face type, each lens's central thickness and each epaxial interval between the lens etc for above-mentioned optical imaging lens has big image plane, at least one beneficial effect such as miniaturized, high imaging quality.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying 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 2C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 1, respectively;
fig. 3 is a schematic structural view showing an optical imaging lens according to embodiment 2 of the present application;
fig. 4A to 4C show an axial chromatic aberration curve, an astigmatism curve, and a distortion 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 6C show an axial chromatic aberration curve, an astigmatism curve, and a distortion 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 8C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 4, respectively;
fig. 9 is a schematic structural view showing an optical imaging lens according to embodiment 5 of the present application;
fig. 10A to 10C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 5, respectively;
fig. 11 is a schematic structural view showing an optical imaging lens according to embodiment 6 of the present application;
fig. 12A to 12C show an axial chromatic aberration curve, an astigmatism curve, and a distortion 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 14C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of an optical imaging lens of embodiment 7;
fig. 15 is a schematic structural view showing an optical imaging lens according to embodiment 8 of the present application; and
fig. 16A to 16C show an axial chromatic aberration curve, an astigmatism curve, and a distortion curve of the optical imaging lens of embodiment 8, 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 only used to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The following provides a detailed description of the features, principles, and other aspects of the present application.
An optical imaging lens according to an exemplary embodiment of the present application may include eight lenses having optical powers, which are 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, respectively. The eight lenses are arranged in order from the object side to the image side along the optical axis. Any adjacent two lenses of the second lens to the eighth lens may have a spacing distance therebetween.
In an exemplary embodiment, the first lens may have a positive power or a negative power; the second lens may have a positive optical power; the third lens may have a positive optical power or a negative optical power; the fourth lens may have a positive power or a negative power; the fifth lens may have a positive power or a negative power; the sixth lens may have a negative optical power; the seventh lens may have a positive optical power; and the eighth lens may have a positive power or a negative power.
In an exemplary embodiment, an optical imaging lens according to the present application further includes a stop disposed between the object side and the first lens.
In an exemplary embodiment, eight lenses having optical powers, that is, the first to eighth lenses may converge incident light rays from different angles onto an imaging surface of the optical imaging lens. In particular, the second lens may have a positive optical power, which is advantageous for reducing spherical aberration generated near the diaphragm; the sixth lens may have a negative optical power to facilitate diverging light.
In an exemplary embodiment, the first lens and the second lens may be cemented to form a cemented lens, which is advantageous for reducing the amount of chromatic aberration influence caused by a large aperture.
In an exemplary embodiment, the first lens and the second lens may be made of glass, which is beneficial to both expanding the selection range of the refractive index and the abbe number of the first lens and the second lens and correcting the axial chromatic aberration and the chromatic aberration of magnification of the lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.0 < f12/f < 3.0, wherein f12 is the combined focal length of the first lens and the second lens, and f is the total effective focal length of the optical imaging lens. F12/f is more than 2.0 and less than 3.0, which is beneficial to reducing the on-axis spherical aberration of the optical imaging lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -3.5 < f6/f3 < -1.0, wherein f3 is the effective focal length of the third lens and f6 is the effective focal length of the sixth lens. More specifically, f6 and f3 further satisfy: -3.5 < f6/f3 < -1.2. Satisfies the condition that f6/f3 is more than-3.5 and less than-1.0, and is beneficial to reducing the primary spherical aberration of the lens and correcting the optical distortion of the lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: -2.0 < f7/f8 < -1.0, wherein f7 is the effective focal length of the seventh lens and f8 is the effective focal length of the eighth lens. More specifically, f7 and f8 further satisfy: -2.0 < f7/f8 < -1.4. The requirements that f7/f8 is more than-2.0 and less than-1.0 are met, and the Petzval field curvature of the optical imaging lens is reduced.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.0 < R2/R1 < 2.5, where R1 is the radius of curvature of the object-side surface of the first lens and R2 is the radius of curvature of the image-side surface of the first lens. More specifically, R2 and R1 may further satisfy: R2/R1 is more than 2.0 and less than 2.4. The requirement that R2/R1 is more than 2.0 and less than 2.5 is met, the rise and the shape of the first lens are favorably and reasonably set, and the four-time reflection ghost image energy generated by the object side surface and the image side surface of the first lens is smaller.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.5 < R7/R4 < 4.5, wherein R4 is the radius of curvature of the object-side surface of the third lens and R7 is the radius of curvature of the image-side surface of the fourth lens. R7/R4 is more than 2.5 and less than 4.5, and ghost image energy generated by secondary reflection on the object side surface of the third lens and the image side surface of the fourth lens is reduced.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 0.5 < R8/R9 < 6.5, wherein R8 is a radius of curvature of an object-side surface of the fifth lens, and R9 is a radius of curvature of an image-side surface of the fifth lens. More specifically, R8 and R9 may further satisfy: R8/R9 is more than 0.9 and less than 6.2. R8/R9 is more than 0.5 and less than 6.5, which is not only beneficial to ensuring the object side surface and the image side surface of the fifth lens in a reasonable range of molding processing, but also beneficial to correcting the astigmatism of the lens in the meridian direction.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.0 < R10/R11 < 2.0, wherein R10 is a curvature radius of an object side surface of the sixth lens element, and R11 is a curvature radius of an image side surface of the sixth lens element. More specifically, R10 and R11 may further satisfy: R10/R11 is more than 1.1 and less than 1.9. The requirement that R10/R11 is more than 1.0 and less than 2.0 is met, the rise and thickness ratio of the object side surface and the image side surface of the sixth lens is favorably controlled within a reasonable range, and the Petzval field curvature of the lens is favorably corrected.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.0 < f/R12 < 2.5, wherein f is the total effective focal length of the optical imaging lens, and R12 is the radius of curvature of the object side surface of the seventh lens. More specifically, f and R12 further may satisfy: f/R12 is more than 1.3 and less than 2.2. The f/R12 is more than 1.0 and less than 2.5, which is beneficial to ensuring the rise of the object side surface of the seventh lens to be in a processing range and correcting the astigmatism in the sagittal direction of the lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 3.0 < CT1/CT2 < 4.5, wherein CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. More specifically, CT1 and CT2 further satisfy: CT1/CT2 is more than 3.2 and less than 4.2. The requirement that CT1/CT2 is more than 3.0 and less than 4.5 is met, and the optical power of the cemented lens formed by the first lens and the second lens through the cementing process is favorably and reasonably distributed so as to reduce the chromatic aberration of magnification of the lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < T34/T23 < 2.5, wherein T23 is the distance between the second lens and the third lens on the optical axis, and T34 is the distance between the third lens and the fourth lens on the optical axis. T34/T23 is more than 1.5 and less than 2.5, which is not only beneficial to ensuring the assembly space of the third lens and the fourth lens and the third lens and the cemented lens, but also beneficial to ensuring the manufacturability of the third lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.0 < T56/T45 < 3.5, wherein T45 is the distance between the fourth lens and the fifth lens on the optical axis, and T56 is the distance between the fifth lens and the sixth lens on the optical axis. More specifically, T56 and T45 may further satisfy: T56/T45 is more than 1.1 and less than 3.2. T56/T45 is more than 1.0 and less than 3.5, which is beneficial to correcting the axial chromatic aberration of the lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < T78/(CT 7+ CT 8) < 2.5, wherein T78 is a distance between the seventh lens and the eighth lens on the optical axis, CT7 is a central thickness of the seventh lens on the optical axis, and CT8 is a central thickness of the eighth lens on the optical axis. More specifically, T78, CT7, and CT8 further satisfy: 1.5 < T78/(CT 7+ CT 8) < 2.4. The requirements that T78/(CT 7+ CT 8) < 1.5 are met are favorable for ensuring the structural manufacturability of the seventh lens and the eighth lens, and the optical distortion of the off-axis field of view of the lens is reduced by adjusting the spacing distance between the seventh lens and the eighth lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 2.0 < (CT 4+ CT 5)/CT 6 < 3.0, wherein CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, and CT6 is the central thickness of the sixth lens on the optical axis. The total optical length of the lens is reduced, the lens tends to be ultra-thin, and astigmatism in meridional and arc loss directions on an off-axis field of view of the lens is corrected.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 30 < V1-V2 < 40, wherein V1 is the Abbe number of the first lens and V2 is the Abbe number of the second lens. More specifically, V1 and V2 may further satisfy: V1-V2 are more than 33 and less than 36. The requirement that V1 is more than 30 and V2 is less than 40 is met, the chromatic aberration of the lens is reduced, and the resolution of the lens is improved under the condition that the total optical length of the lens is not changed.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: N2-N1 > 0.2, where N1 is the refractive index of the first lens and N2 is the refractive index of the second lens. N2-N1 is more than 0.2, so that the refractive indexes of the first lens and the second lens are different to a certain extent, and further, the matched optimization design of the lenses with high refractive index and low refractive index is realized to correct the chromatic aberration of magnification on the external view field.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: imgH > 8.0mm, wherein ImgH is half the length of the diagonal line of the effective pixel area on the imaging surface of the optical imaging lens. The requirement that ImgH is more than 8.0mm is met, pixels of a chip which can be matched with the optical imaging lens can reach 1 hundred million or even higher, and the resolution of the lens is improved.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: f/EPD < 2.0, where f is the total effective focal length of the optical imaging lens and EPD is the entrance pupil diameter of the optical imaging lens. The f/EPD is less than 2.0, so that the lens is favorable for having a large aperture, namely the entrance pupil diameter of the lens is larger, the lens is favorable for receiving more effective light rays, and the night shooting capability is improved.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: the FOV is more than or equal to 80 degrees, wherein the FOV is the maximum field angle of the optical imaging lens. More specifically, the FOV may further satisfy: the FOV is more than or equal to 83 degrees and less than or equal to 90 degrees. The FOV is more than or equal to 80 degrees, which is beneficial to ensuring the larger imaging range received by the lens and ensuring the equivalent focal length of the lens to be about 25 mm.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.8 < f/R3 < 2.5, wherein f is the total effective focal length of the optical imaging lens, and R3 is the curvature radius of the image side surface of the second lens.
In an exemplary embodiment, an optical imaging lens according to the present application may satisfy: 1.5 < R6/R5 < 3.4, wherein R6 is the curvature radius of the object side surface of the fourth lens, and R5 is the curvature radius of the image side surface of the third lens.
In an exemplary embodiment, an optical imaging lens according to the present application further includes a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging surface. The application provides an optical imaging lens with the characteristics of large image plane, high pixel, miniaturization, high imaging quality and the like. The optical imaging lens according to the above-described 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 type, the central thickness of each lens, the axial distance between each lens and the like, the incident light can be effectively converged, the optical total length of the imaging lens is reduced, the machinability of the imaging lens is improved, and the optical imaging lens is more favorable for production and processing.
In the embodiment of the present application, at least one of the mirror surfaces of each of the first to eighth lenses is an aspherical mirror surface, and specifically, at least one of the mirror surfaces of each of the third to eighth lenses is an aspherical mirror surface, that is, at least one of the object-side surface of the third lens to the image-side surface of the eighth 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 in imaging can be eliminated as much as possible, and the imaging quality is further improved. Optionally, at least one of an object-side surface and an image-side surface of each of the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspheric mirror surface. Optionally, each of the third, fourth, fifth, sixth, seventh, and eighth lenses has an object-side surface and an image-side surface that are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting an optical imaging lens may be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although eight lenses are exemplified in the embodiment, the optical imaging lens is not limited to include eight 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 2C. 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 image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has positive power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a concave image-side surface S13. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object passes through the respective surfaces S1 to S17 in order and is finally imaged on the imaging plane S18.
Table 1 shows a basic parameter table of the optical imaging lens of embodiment 1, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm).
TABLE 1
In the present example, the total effective focal length f of the optical imaging lens is 8.42mm, the combined focal length f12 of the first lens and the second lens is 20.48mm, 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 S18 of the optical imaging lens) is 9.50mm, the half ImgH of the diagonal line length of the effective pixel area on the imaging surface S18 of the optical imaging lens is 8.41mm, and the half Semi-FOV of the maximum angle of view of the optical imaging lens is 44.1 °.
In embodiment 1, the object-side surface and the image-side surface of any one of the third lens E3 to the eighth lens E8 are aspheric, and the profile x of each aspheric lens can be defined by, but is not limited to, the following aspheric formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 below shows the coefficients A of the higher-order terms which can be used for the aspherical mirror surfaces S4 to S15 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S4 | 8.1580E-02 | 2.1719E-02 | 3.8329E-03 | 5.8928E-04 | 8.7139E-05 | 5.0942E-05 | 4.1951E-05 | 1.9700E-05 | 4.3225E-06 |
| S5 | 9.9725E-02 | 2.5760E-02 | 5.1638E-03 | 9.8467E-04 | 1.7431E-04 | 6.8903E-05 | 5.2205E-05 | 3.2002E-05 | 1.2428E-05 |
| S6 | -8.5928E-02 | 1.3374E-02 | 3.2718E-03 | 4.3592E-04 | -1.7450E-04 | -1.1153E-04 | -4.2407E-05 | -1.0160E-05 | 5.2699E-06 |
| S7 | -1.2706E-01 | 1.4574E-02 | 5.1675E-03 | 1.4290E-03 | 1.4033E-04 | 4.1336E-06 | -4.3207E-05 | -1.2755E-05 | -8.4897E-06 |
| S8 | -2.5424E-01 | -1.4783E-02 | 2.3682E-03 | 2.2027E-03 | 8.3431E-04 | 3.6156E-04 | 1.1489E-04 | 3.7276E-05 | 1.1009E-05 |
| S9 | -4.0842E-01 | -2.5062E-02 | 6.2290E-05 | 1.7373E-03 | 2.8729E-05 | 8.3714E-05 | -1.0410E-04 | -3.4772E-05 | -3.6729E-05 |
| S10 | -1.4400E+00 | 1.5001E-02 | -3.8483E-03 | 2.9642E-02 | 4.6249E-04 | 1.1422E-03 | -4.5287E-04 | -2.2635E-04 | -2.4534E-04 |
| S11 | -2.1505E+00 | 3.2059E-01 | -4.0676E-02 | 2.7906E-02 | -1.6035E-02 | 4.6811E-03 | -3.1105E-04 | -1.3185E-04 | -2.2350E-04 |
| S12 | -4.4065E+00 | 7.2661E-01 | 6.9255E-02 | -6.3389E-02 | -2.4648E-03 | -8.0303E-03 | -2.0944E-03 | 4.7384E-03 | 4.9735E-04 |
| S13 | -1.7940E+00 | 3.5539E-02 | 2.2874E-01 | -1.2607E-01 | 3.5496E-02 | -2.5442E-02 | -9.4343E-03 | 1.0287E-03 | 2.4469E-03 |
| S14 | 2.1951E+00 | 1.2889E-01 | -1.4716E-01 | 3.3696E-02 | -3.1239E-02 | 1.4799E-02 | -1.9417E-02 | 9.4399E-03 | 1.0662E-03 |
| S15 | -4.0410E+00 | 6.5752E-01 | -9.3548E-02 | 9.7757E-02 | -6.4787E-02 | 9.4099E-03 | -1.7474E-02 | 2.8018E-03 | 1.1985E-03 |
TABLE 2
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 distortion magnitude values corresponding to different image heights. As can be seen from fig. 2A to 2C, 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 4C. 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 image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has positive power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a concave image-side surface S13. The eighth lens element E8 has a negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object passes through the respective surfaces S1 to S17 in order and is finally imaged on the imaging plane S18.
In this example, the total effective focal length f of the optical imaging lens is 8.29mm, the combined focal length f12 of the first lens and the second lens is 21.69mm, the total length TTL of the optical imaging lens is 9.62mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S18 of the optical imaging lens is 8.37mm, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 44.4 °.
Table 3 shows a basic parameter table of the optical imaging lens of embodiment 2, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 4 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 3
TABLE 4
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 2, which represents 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 distortion magnitude values corresponding to different image heights. As can be seen from fig. 4A to 4C, 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 6C. 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 image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has negative power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a concave image-side surface S13. The eighth lens element E8 has a negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object passes through the respective surfaces S1 to S17 in order and is finally imaged on the imaging plane S18.
In this example, the total effective focal length f of the optical imaging lens is 8.39mm, the combined focal length f12 of the first lens and the second lens is 17.92mm, the total length TTL of the optical imaging lens is 9.60mm, a half ImgH of the diagonal length of the effective pixel area on the imaging plane S18 of the optical imaging lens is 8.25mm, and a half Semi-FOV of the maximum field angle of the optical imaging lens is 43.6 °.
Table 5 shows a basic parameter table of the optical imaging lens of embodiment 3, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 6 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 5
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S4 | 9.2137E-02 | 2.0184E-02 | 3.1021E-03 | 4.4042E-04 | 6.4331E-05 | 3.1702E-05 | 1.9276E-05 | 3.3668E-06 | -1.9079E-07 |
| S5 | 1.0923E-01 | 2.4559E-02 | 4.7243E-03 | 1.0006E-03 | 2.5005E-04 | 9.2690E-05 | 5.5225E-05 | 2.5975E-05 | 1.2540E-05 |
| S6 | -1.0048E-01 | 1.6413E-02 | 2.9077E-03 | 4.4394E-04 | -6.6535E-05 | -6.4140E-05 | -2.1032E-05 | -5.2767E-06 | 1.0360E-05 |
| S7 | -1.4231E-01 | 2.0390E-02 | 4.7695E-03 | 9.7001E-04 | 7.0621E-05 | -4.8328E-05 | -3.4300E-05 | -2.3167E-05 | 4.0471E-06 |
| S8 | -2.6007E-01 | -1.2373E-02 | 2.8181E-03 | 1.9018E-03 | 7.6487E-04 | 3.3362E-04 | 1.0972E-04 | 3.4157E-05 | 2.0117E-06 |
| S9 | -3.9921E-01 | -2.5812E-02 | 6.2883E-06 | 9.3779E-04 | 1.4373E-04 | 1.0804E-04 | -2.7482E-05 | -1.3634E-05 | -1.0737E-05 |
| S10 | -1.4836E+00 | 1.2798E-02 | -8.9103E-03 | 2.3007E-02 | 4.0337E-04 | 3.5191E-03 | 4.1107E-04 | 7.8877E-05 | -6.7173E-05 |
| S11 | -2.2724E+00 | 2.7943E-01 | -4.6663E-02 | 2.7890E-02 | -1.1993E-02 | 6.1235E-03 | -1.5552E-03 | 2.9961E-04 | 1.7609E-04 |
| S12 | -3.9329E+00 | 5.8631E-01 | 4.5763E-02 | 3.9640E-03 | -3.5483E-02 | -2.0927E-02 | 5.7446E-03 | 8.7034E-03 | -4.3160E-04 |
| S13 | -1.8852E+00 | 1.2284E-01 | 1.7524E-01 | -6.6382E-02 | 9.4683E-03 | -3.7631E-02 | -4.5287E-03 | 7.4666E-03 | 4.1929E-03 |
| S14 | 1.9527E+00 | 2.5696E-01 | -1.4910E-01 | -2.4419E-02 | 3.3055E-02 | -1.6647E-02 | -7.1535E-03 | 8.4749E-03 | 4.0594E-03 |
| S15 | -3.5358E+00 | 5.6379E-01 | -7.0423E-02 | 2.3523E-02 | -1.3490E-02 | -2.2965E-03 | -5.2879E-03 | 7.1016E-04 | 4.3840E-03 |
TABLE 6
Fig. 6A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 3, which represent 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 distortion magnitude values corresponding to different image heights. As can be seen from fig. 6A to 6C, the optical imaging lens 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 8C. 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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has a negative power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a concave image-side surface S13. The eighth lens element E8 has a negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object sequentially passes through the respective surfaces S1 to S17 and is finally imaged on the imaging surface S18.
In this example, the total effective focal length f of the optical imaging lens is 8.42mm, the combined focal length f12 of the first lens and the second lens is 24.62mm, the total length TTL of the optical imaging lens is 9.62mm, a half ImgH of the diagonal length of the effective pixel area on the imaging plane S18 of the optical imaging lens is 8.05mm, and a half Semi-FOV of the maximum field angle of the optical imaging lens is 43.3 °.
Table 7 shows a basic parameter table of the optical imaging lens of embodiment 4, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 4, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
TABLE 7
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S4 | 8.2213E-02 | 2.2518E-02 | 3.8668E-03 | 5.0420E-04 | 1.5269E-06 | 2.0150E-06 | 1.2427E-05 | 3.8303E-06 | -4.2118E-06 |
| S5 | 1.0052E-01 | 2.5882E-02 | 5.1361E-03 | 1.0089E-03 | 1.4997E-04 | 2.9055E-05 | 1.6170E-05 | 1.3234E-05 | 3.4542E-06 |
| S6 | -1.3357E-01 | 1.8652E-02 | 3.5683E-03 | 4.4334E-04 | -2.3852E-04 | -8.8827E-05 | -1.6274E-05 | 1.2561E-05 | 9.0259E-06 |
| S7 | -1.8396E-01 | 2.0817E-02 | 6.1236E-03 | 1.1693E-03 | -1.1431E-04 | -1.2288E-04 | -5.8257E-05 | -1.4661E-05 | 3.5342E-06 |
| S8 | -2.3553E-01 | -8.4088E-03 | 3.9567E-03 | 1.6402E-03 | 3.1938E-04 | 7.7160E-05 | 8.1242E-06 | 1.7844E-06 | -5.1804E-07 |
| S9 | -3.5907E-01 | -2.1170E-02 | -9.8332E-04 | 1.8304E-05 | -5.2631E-04 | -1.1932E-04 | -8.7202E-05 | -2.2468E-05 | -1.5897E-05 |
| S10 | -1.6720E+00 | 1.9101E-02 | -3.0185E-04 | 2.1306E-02 | -1.4077E-03 | 3.4903E-03 | 1.1899E-03 | 2.0007E-05 | -3.1604E-04 |
| S11 | -2.2001E+00 | 2.9502E-01 | -3.2622E-02 | 1.6506E-02 | -1.0753E-02 | 6.3835E-03 | -1.1951E-03 | -3.7321E-04 | 4.3442E-04 |
| S12 | -3.5652E+00 | 5.0966E-01 | 8.9377E-03 | 1.4624E-02 | -3.0386E-02 | -1.7899E-02 | 8.7529E-03 | 1.0070E-02 | 3.7553E-04 |
| S13 | -1.7299E+00 | 1.5049E-01 | 1.5112E-01 | -7.2672E-02 | -1.4644E-02 | -2.4920E-02 | 7.3911E-03 | 7.7142E-03 | 1.8504E-03 |
| S14 | -2.4143E+00 | 1.4060E+00 | -5.3921E-01 | 1.0682E-01 | -5.8053E-02 | 4.2529E-02 | -3.9847E-02 | 1.3613E-02 | 1.1815E-03 |
| S15 | -7.1924E+00 | 1.5063E+00 | -3.5525E-01 | 1.6909E-01 | -9.9204E-02 | 4.8017E-02 | -2.3967E-02 | 7.5567E-03 | -7.3120E-03 |
TABLE 8
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 distortion magnitude values corresponding to different image heights. As can be seen from fig. 8A to 8C, 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 10C. 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 stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has positive refractive power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a concave image-side surface S13. The eighth lens element E8 has a negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object passes through the respective surfaces S1 to S17 in order and is finally imaged on the imaging plane S18.
In this example, the total effective focal length f of the optical imaging lens is 8.37mm, the combined focal length f12 of the first lens and the second lens is 20.80mm, the total length TTL of the optical imaging lens is 9.67mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S18 of the optical imaging lens is 8.04mm, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 43.0 °.
Table 9 shows a basic parameter table of the optical imaging lens of embodiment 5, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 10 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 9
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 distortion magnitude values corresponding to different image heights. As can be seen from fig. 10A to 10C, 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 12C. 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 image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has positive power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a concave image-side surface S13. The eighth lens element E8 has a negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object passes through the respective surfaces S1 to S17 in order and is finally imaged on the imaging plane S18.
In this example, the total effective focal length f of the optical imaging lens is 8.64mm, the combined focal length f12 of the first lens and the second lens is 22.34mm, the total length TTL of the optical imaging lens is 9.84mm, the half ImgH of the diagonal length of the effective pixel area on the imaging surface S18 of the optical imaging lens is 8.07mm, and the half Semi-FOV of the maximum field angle of the optical imaging lens is 42.1 °.
Table 11 shows a basic parameter table of the optical imaging lens of embodiment 6, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 12 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 11
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S4 | 7.7116E-02 | 1.9595E-02 | 2.9847E-03 | 3.9570E-04 | 2.5721E-05 | 8.1009E-06 | -2.8790E-06 | -7.0527E-06 | -4.6632E-06 |
| S5 | 9.4662E-02 | 2.4503E-02 | 4.5635E-03 | 9.1745E-04 | 1.6519E-04 | 5.4552E-05 | 2.4259E-05 | 9.5243E-06 | 7.4602E-07 |
| S6 | -1.2239E-01 | 1.4330E-02 | 3.9102E-03 | 5.4506E-04 | -8.5844E-05 | -5.3504E-05 | -8.7569E-06 | 2.2113E-06 | 4.4801E-06 |
| S7 | -1.6600E-01 | 1.7808E-02 | 6.0494E-03 | 8.3568E-04 | -1.2582E-04 | -9.2640E-05 | -2.9947E-05 | -6.1622E-06 | -5.7982E-07 |
| S8 | -2.9472E-01 | -1.0045E-02 | 3.4412E-03 | 9.5340E-04 | 1.4138E-04 | 1.1223E-04 | 6.6196E-05 | 2.9173E-05 | 9.0957E-06 |
| S9 | -3.5623E-01 | -2.1222E-02 | -2.1413E-03 | -7.1281E-04 | -4.9544E-04 | -7.9305E-05 | -4.1056E-05 | -8.4721E-06 | -6.4981E-06 |
| S10 | -1.4043E+00 | -6.3964E-02 | -3.5478E-03 | 2.5509E-02 | 6.8042E-03 | 3.9655E-03 | 8.5092E-05 | -6.8175E-04 | -5.6892E-04 |
| S11 | -1.9377E+00 | 2.6666E-01 | -1.6804E-02 | 2.0713E-02 | -1.4076E-02 | 2.6048E-03 | -9.9891E-04 | 7.3292E-04 | 4.9521E-04 |
| S12 | -4.5442E+00 | 7.1311E-01 | -3.5652E-02 | 5.8621E-02 | -4.2358E-02 | -2.0578E-02 | -3.1216E-03 | 1.1828E-02 | 3.2310E-03 |
| S13 | -2.9167E+00 | 3.0055E-01 | 1.0602E-01 | -4.3407E-02 | -3.6815E-03 | -3.3455E-02 | -3.4717E-03 | 1.7189E-02 | 1.1079E-02 |
| S14 | -3.4177E-01 | 7.6369E-01 | -3.4001E-01 | 3.7907E-02 | -3.2099E-02 | 3.2758E-02 | -4.2381E-02 | 1.1708E-02 | 4.5812E-03 |
| S15 | -5.9963E+00 | 9.4283E-01 | -3.6244E-01 | 1.1149E-01 | -8.5782E-02 | 4.3203E-02 | -3.1530E-02 | 1.4310E-02 | -8.9480E-03 |
TABLE 12
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 corresponding to different image heights. As can be seen from fig. 12A to 12C, 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 14C. 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 image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has positive refractive power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has a negative refractive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a convex image-side surface S13. The eighth lens element E8 has a negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object passes through the respective surfaces S1 to S17 in order and is finally imaged on the imaging plane S18.
In this example, the total effective focal length f of the optical imaging lens is 8.73mm, the combined focal length f12 of the first lens and the second lens is 24.41mm, the total length TTL of the optical imaging lens is 9.89mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S18 of the optical imaging lens is 8.01mm, and a half Semi-FOV of the maximum field angle of the optical imaging lens is 42.0 °.
Table 13 shows a basic parameter table of the optical imaging lens of embodiment 7, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 14 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.
Watch 13
| Flour mark | A4 | A6 | A8 | A10 | A12 | A14 | A16 | A18 | A20 |
| S4 | 8.4348E-02 | 2.1506E-02 | 3.4653E-03 | 5.0920E-04 | 3.9865E-05 | 4.0010E-06 | -8.1216E-06 | -9.4147E-06 | -5.8690E-06 |
| S5 | 9.4285E-02 | 2.5531E-02 | 4.8499E-03 | 1.0152E-03 | 2.0419E-04 | 6.3330E-05 | 2.6739E-05 | 9.2631E-06 | 1.5495E-06 |
| S6 | -1.0330E-01 | 1.3995E-02 | 3.4490E-03 | 4.9199E-04 | -2.3103E-05 | -1.1683E-05 | 5.5779E-06 | 7.3445E-06 | 3.8041E-06 |
| S7 | -1.4239E-01 | 1.7909E-02 | 5.3895E-03 | 6.3841E-04 | -1.1396E-04 | -6.3215E-05 | -1.4974E-05 | 1.9038E-06 | 2.2385E-06 |
| S8 | -2.9222E-01 | -8.2068E-03 | 2.3799E-03 | 7.6442E-04 | 1.1378E-04 | 1.6175E-04 | 6.5803E-05 | 3.2555E-05 | 7.6834E-06 |
| S9 | -4.3792E-01 | -1.5979E-02 | -3.3277E-03 | -2.6493E-04 | -7.0667E-04 | 3.7218E-05 | -5.1749E-05 | -1.9007E-06 | -7.1506E-06 |
| S10 | -1.5559E+00 | -2.9832E-02 | -2.2054E-02 | 2.8202E-02 | 1.1086E-02 | 6.0610E-03 | -8.4994E-04 | -1.7424E-03 | -1.0134E-03 |
| S11 | -2.1683E+00 | 2.9362E-01 | -4.5898E-02 | 2.7134E-02 | -8.9912E-03 | 4.1597E-03 | 1.6538E-04 | 1.9794E-03 | -4.7060E-04 |
| S12 | -3.9115E+00 | 2.1594E-01 | -1.3744E-02 | 4.8061E-02 | -5.5875E-02 | -2.0408E-02 | 1.1885E-02 | 1.5851E-02 | -3.2272E-03 |
| S13 | -2.8245E-01 | -1.6964E-01 | 1.4280E-01 | 1.5528E-02 | -3.2951E-02 | -3.9229E-02 | 4.9443E-04 | 1.3431E-02 | 8.1521E-04 |
| S14 | 3.6398E-01 | 6.4875E-01 | -3.2597E-01 | 1.2818E-01 | -5.5470E-02 | 2.5320E-02 | -1.7819E-02 | 8.5864E-03 | -5.7113E-04 |
| S15 | -5.6395E+00 | 8.5460E-01 | -3.2446E-01 | 1.2375E-01 | -7.5077E-02 | 2.8860E-02 | -1.7124E-02 | 6.7589E-03 | -2.3800E-04 |
TABLE 14
Fig. 14A shows on-axis chromatic aberration curves of the optical imaging lens of embodiment 7, which represent deviation of convergence focuses of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing 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 distortion magnitude values corresponding to different image heights. As can be seen from fig. 14A to 14C, the optical imaging lens according to embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 to 16C. Fig. 15 shows a schematic structural diagram of an optical imaging lens according to embodiment 8 of the present application.
As shown in fig. 15, the optical imaging lens includes, in order from an object side to an image side: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image forming surface S18.
The first lens element E1 has positive refractive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive refractive power, and has a convex object-side surface S2 and a concave image-side surface S3. The third lens element E3 has positive refractive power, and has a convex object-side surface S4 and a concave image-side surface S5. The fourth lens element E4 has positive power, and has a convex object-side surface S6 and a concave image-side surface S7. The fifth lens element E5 has positive power, and has a concave object-side surface S8 and a convex image-side surface S9. The sixth lens element E6 has negative power, and has a convex object-side surface S10 and a concave image-side surface S11. The seventh lens element E7 has positive power, and has a convex object-side surface S12 and a concave image-side surface S13. The eighth lens element E8 has negative refractive power, and has a concave object-side surface S14 and a concave image-side surface S15. The filter E9 has an object side surface S16 and an image side surface S17. The light from the object passes through the respective surfaces S1 to S17 in order and is finally imaged on the imaging plane S18.
In this example, the total effective focal length f of the optical imaging lens is 8.62mm, the combined focal length f12 of the first lens and the second lens is 23.51mm, the total length TTL of the optical imaging lens is 9.87mm, a half ImgH of the diagonal length of the effective pixel area on the imaging surface S18 of the optical imaging lens is 8.01mm, and a half Semi-FOV of the maximum field angle of the optical imaging lens is 42.0 °.
Table 15 shows a basic parameter table of the optical imaging lens of embodiment 8, in which the units of the radius of curvature, the thickness/distance, and the focal length are all millimeters (mm). Table 16 shows high-order term coefficients that can be used for each aspherical mirror surface in example 8, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Watch 15
TABLE 16
Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging lens of embodiment 8, which represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens of embodiment 8. Fig. 16C shows a distortion curve of the optical imaging lens of embodiment 8, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 16A to 16C, the optical imaging lens according to embodiment 8 can achieve good imaging quality.
In conclusion, examples 1 to 8 each satisfy the relationship shown in table 17.
| Conditions/examples | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| f/EPD | 1.99 | 1.99 | 2.00 | 1.98 | 1.90 | 1.95 | 2.00 | 1.96 |
| f12/f | 2.43 | 2.62 | 2.14 | 2.93 | 2.49 | 2.59 | 2.80 | 2.73 |
| f6/f3 | -1.94 | -1.83 | -1.25 | -3.08 | -1.70 | -1.36 | -3.47 | -1.39 |
| f7/f8 | -1.75 | -1.82 | -1.88 | -1.75 | -1.83 | -1.75 | -1.50 | -1.63 |
| R2/R1 | 2.23 | 2.15 | 2.32 | 2.03 | 2.18 | 2.13 | 2.03 | 2.06 |
| f/R3 | 2.06 | 2.02 | 1.92 | 2.34 | 2.05 | 2.15 | 2.34 | 2.22 |
| R6/R5 | 2.60 | 1.97 | 3.25 | 2.14 | 1.78 | 1.78 | 1.58 | 1.63 |
| R7/R4 | 4.40 | 3.50 | 4.19 | 3.03 | 2.90 | 3.26 | 3.08 | 2.64 |
| R8/R9 | 3.31 | 2.15 | 3.28 | 6.11 | 2.57 | 2.09 | 0.98 | 2.52 |
| R10/R11 | 1.28 | 1.26 | 1.34 | 1.20 | 1.36 | 1.81 | 1.24 | 1.55 |
| f/R12 | 1.90 | 1.79 | 1.71 | 1.61 | 1.81 | 2.09 | 1.39 | 2.02 |
| CT1/CT2 | 4.13 | 3.44 | 3.33 | 3.35 | 3.42 | 3.40 | 3.35 | 3.36 |
| T34/T23 | 2.09 | 1.77 | 1.62 | 2.33 | 1.52 | 1.77 | 1.73 | 1.77 |
| T56/T45 | 2.89 | 2.39 | 3.09 | 2.79 | 2.50 | 2.41 | 1.20 | 2.18 |
| T78/(CT7+CT8) | 1.53 | 1.61 | 1.68 | 1.66 | 1.62 | 1.84 | 2.17 | 2.27 |
| (CT4+CT5)/CT6 | 2.15 | 2.23 | 2.27 | 2.95 | 2.39 | 2.03 | 2.50 | 2.40 |
| V1-V2 | 34.80 | 34.80 | 34.80 | 34.80 | 34.80 | 34.80 | 34.80 | 34.80 |
| N2-N1 | 0.22 | 0.22 | 0.22 | 0.22 | 0.22 | 0.22 | 0.22 | 0.22 |
| FOV | 88.3 | 88.7 | 87.2 | 86.5 | 86.0 | 84.2 | 84.0 | 84.0 |
TABLE 17
The present application also provides an imaging device whose electron photosensitive element may be a photo-coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device may be a stand-alone imaging device such as a digital camera, or may be an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the 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 as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (37)
1. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
a diaphragm;
a first lens having a positive optical power;
a second lens having a negative optical power;
a third lens having a positive optical power;
a fourth lens having a focal power;
a fifth lens having optical power;
a sixth lens having a negative optical power;
a seventh lens having positive optical power; and
an eighth lens having a negative optical power;
at least one mirror surface of the object side surface of the first lens to the image side surface of the eighth lens is an aspheric mirror surface;
the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens satisfies: imgH is more than 8.0mm;
a separation distance T78 on the optical axis of the seventh lens and the eighth lens, a center thickness CT7 on the optical axis of the seventh lens, and a center thickness CT8 on the optical axis of the eighth lens satisfy: T78/(CT 7+ CT 8) < 2.5 < 1.5;
the number of lenses of the optical imaging lens having optical power is eight.
2. The optical imaging lens of claim 1, wherein a combined focal length f12 of the first lens and the second lens and a total effective focal length f of the optical imaging lens satisfy: f12/f is more than 2.0 and less than 3.0.
3. The optical imaging lens according to claim 1, wherein the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -3.5 < f6/f3 < -1.0.
4. The optical imaging lens according to claim 1, wherein an effective focal length f7 of the seventh lens and an effective focal length f8 of the eighth lens satisfy: -2.0 < f7/f8 < -1.0.
5. The optical imaging lens according to claim 1, wherein the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: R2/R1 is more than 2.0 and less than 2.5.
6. The optical imaging lens system according to claim 1, wherein the radius of curvature R4 of the object-side surface of the third lens and the radius of curvature R7 of the image-side surface of the fourth lens satisfy: 2.5 < R7/R4 < 4.5.
7. The optical imaging lens system according to claim 1, wherein a radius of curvature R8 of an object-side surface of the fifth lens and a radius of curvature R9 of an image-side surface of the fifth lens satisfy: R8/R9 is more than 0.5 and less than 6.5.
8. The optical imaging lens according to claim 1, wherein a radius of curvature R10 of an object-side surface of the sixth lens and a radius of curvature R11 of an image-side surface of the sixth lens satisfy: R10/R11 is more than 1.0 and less than 2.0.
9. The optical imaging lens of claim 1, wherein the total effective focal length f of the optical imaging lens and the radius of curvature R12 of the object side surface of the seventh lens satisfy: f/R12 is more than 1.0 and less than 2.5.
10. The optical imaging lens according to claim 1, wherein a central thickness CT1 of the first lens on the optical axis and a central thickness CT2 of the second lens on the optical axis satisfy: CT1/CT2 is more than 3.0 and less than 4.5.
11. The optical imaging lens according to claim 1, wherein a separation distance T23 of the second lens and the third lens on the optical axis and a separation distance T34 of the third lens and the fourth lens on the optical axis satisfy: T34/T23 is more than 1.5 and less than 2.5.
12. The optical imaging lens according to claim 1, wherein a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a separation distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T56/T45 is more than 1.0 and less than 3.5.
13. The optical imaging lens according to claim 1, wherein a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 2.0 < (CT 4+ CT 5)/CT 6 < 3.0.
14. The optical imaging lens according to claim 1, wherein abbe number V1 of the first lens and abbe number V2 of the second lens satisfy: V1-V2 are more than 30 and less than 40.
15. The optical imaging lens according to claim 1, wherein the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: N2-N1 > 0.2.
16. The optical imaging lens of any one of claims 1 to 15, wherein the first lens and the second lens are cemented to form a cemented lens.
17. Optical imaging lens according to any of claims 1 to 15, characterized in that the first lens and the second lens are glass lenses.
18. The optical imaging lens of any one of claims 1-15, wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.0.
19. The optical imaging lens as claimed in any one of claims 1 to 15, wherein the maximum field angle FOV of the optical imaging lens satisfies: the FOV is more than or equal to 80 degrees.
20. The optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprises:
a diaphragm;
a first lens having a positive optical power;
a second lens having a negative optical power;
a third lens having a positive optical power;
a fourth lens having a focal power;
a fifth lens having optical power;
a sixth lens having a negative optical power;
a seventh lens having positive optical power; and
an eighth lens having a negative optical power;
at least one mirror surface of the object side surface of the first lens to the image side surface of the eighth lens is an aspheric mirror surface; the effective focal length f3 of the third lens and the effective focal length f6 of the sixth lens satisfy: -3.5 < f6/f3 < -1.0;
a separation distance T78 between the seventh lens and the eighth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy: T78/(CT 7+ CT 8) < 2.5 < 1.5;
the number of lenses of the optical imaging lens having optical power is eight.
21. The optical imaging lens of claim 20, wherein the combined focal length f12 of the first lens and the second lens and the total effective focal length f of the optical imaging lens satisfy: f12/f is more than 2.0 and less than 3.0.
22. The optical imaging lens of claim 20, wherein the refractive index N1 of the first lens and the refractive index N2 of the second lens satisfy: N2-N1 > 0.2.
23. The optical imaging lens of claim 20, wherein the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy: -2.0 < f7/f8 < -1.0.
24. The optical imaging lens system of claim 20, wherein the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens satisfy: R2/R1 is more than 2.0 and less than 2.5.
25. The optical imaging lens of claim 20, wherein the radius of curvature R4 of the object-side surface of the third lens and the radius of curvature R7 of the image-side surface of the fourth lens satisfy: 2.5 < R7/R4 < 4.5.
26. The optical imaging lens of claim 20, wherein the radius of curvature R8 of the object-side surface of the fifth lens and the radius of curvature R9 of the image-side surface of the fifth lens satisfy: R8/R9 is more than 0.5 and less than 6.5.
27. The optical imaging lens of claim 20, wherein the radius of curvature R10 of the object-side surface of the sixth lens and the radius of curvature R11 of the image-side surface of the sixth lens satisfy: R10/R11 is more than 1.0 and less than 2.0.
28. The optical imaging lens of claim 20, wherein the total effective focal length f of the optical imaging lens and the radius of curvature R12 of the object side surface of the seventh lens satisfy: f/R12 is more than 1.0 and less than 2.5.
29. The optical imaging lens according to claim 20, wherein a central thickness CT1 of the first lens on the optical axis and a central thickness CT2 of the second lens on the optical axis satisfy: CT1/CT2 is more than 3.0 and less than 4.5.
30. The optical imaging lens according to claim 20, wherein a separation distance T23 between the second lens and the third lens on the optical axis and a separation distance T34 between the third lens and the fourth lens on the optical axis satisfy: T34/T23 is more than 1.5 and less than 2.5.
31. The optical imaging lens according to claim 20, wherein a separation distance T45 between the fourth lens and the fifth lens on the optical axis and a separation distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T56/T45 is more than 1.0 and less than 3.5.
32. The optical imaging lens according to claim 20, wherein a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, and a center thickness CT6 of the sixth lens on the optical axis satisfy: 2.0 < (CT 4+ CT 5)/CT 6 < 3.0.
33. The optical imaging lens according to claim 20, wherein abbe number V1 of the first lens and abbe number V2 of the second lens satisfy: V1-V2 are more than 30 and less than 40.
34. The optical imaging lens of any one of claims 20-33, wherein the first lens and the second lens are cemented to form a cemented lens.
35. An optical imaging lens according to any one of claims 20 to 33, wherein the first lens and the second lens are glass lenses.
36. The optical imaging lens of any one of claims 20-33, wherein the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy: f/EPD < 2.0.
37. The optical imaging lens of any one of claims 20-33 wherein the maximum field angle FOV of the optical imaging lens satisfies: the FOV is more than or equal to 80 degrees.
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