CN109375349B - Imaging lens - Google Patents

Imaging lens Download PDF

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Publication number
CN109375349B
CN109375349B CN201811589361.9A CN201811589361A CN109375349B CN 109375349 B CN109375349 B CN 109375349B CN 201811589361 A CN201811589361 A CN 201811589361A CN 109375349 B CN109375349 B CN 109375349B
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lens
imaging
image
imaging lens
convex
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CN109375349A (en
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黄文博
贺凌波
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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
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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

Abstract

The application discloses an imaging lens, which sequentially comprises the following components 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the distance TTL from the center of the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis, the effective focal length fx in the X-axis direction of the imaging lens and the effective focal length fy in the Y-axis direction of the imaging lens meet TTL/(fx+fy) 2<1.1. The imaging lens provided by the application is an eight-piece imaging lens with high pixels, long focus and miniaturization, and can better meet the use requirements of various special scenes.

Description

Imaging lens
Technical Field
The present application relates to an imaging lens, and more particularly, to an optical imaging lens including eight lenses.
Background
In recent years, with the development of miniaturized imaging lenses and the popularization of chips of large-sized, high-pixel complementary metal oxide semiconductor devices (CMOS) or photosensitive coupling devices (CCD), various large-end manufacturers have made higher demands on the performance of imaging lenses. Because the current various terminal lenses mostly adopt a rotationally symmetrical (axisymmetrical) aspheric surface type structure, the terminal lenses only have sufficient degrees of freedom in the meridian direction, and therefore, the off-axis meridian aberration and the sagittal aberration cannot be effectively corrected.
Disclosure of Invention
The present application provides an imaging lens applicable to a portable electronic product, which can at least solve or partially solve at least one of the above-mentioned drawbacks in the prior art, such as an imaging lens applicable to a portable electronic product.
In one aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the distance TTL from the center of the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis, the effective focal length fx in the X-axis direction of the imaging lens and the effective focal length fy in the Y-axis direction of the imaging lens meet TTL/(fx+fy) 2<1.1.
In one embodiment, the effective focal length fx in the X-axis direction of the imaging lens and the effective focal length fy in the Y-axis direction of the imaging lens satisfy 0.8 < fx/fy < 1.2.
In one embodiment, the effective focal length fy of half of the diagonal length ImgH of the effective pixel region on the imaging surface and the Y-axis direction of the imaging lens satisfies ImgH/fy <0.5.
In one embodiment, the effective focal length f3 of the third lens, the effective focal length f1 of the first lens, and the effective focal length f5 of the fifth lens satisfy 0< f 3/(f1+f5) <0.8.
In one embodiment, the effective focal length f4 of the fourth lens and the radius of curvature R8 of the fourth lens image side satisfy-2.3 < f4/R8< -1.3.
In one embodiment, the radius of curvature R5 of the third lens object-side surface and the radius of curvature R1 of the first lens object-side surface satisfy 1< R5/R1<1.8.
In one embodiment, the radius of curvature R12 of the image-side surface of the sixth lens element, the radius of curvature R13 of the object-side surface of the seventh lens element, the radius of curvature R16 of the image-side surface of the eighth lens element and the radius of curvature R10 of the image-side surface of the fifth lens element satisfy 0.3.ltoreq.R12+R13-R16)/R10.ltoreq.1.3.
In one embodiment, the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy 0.5< ct1/(CT 2+ CT3+ CT 4) <1.2.
In one embodiment, an air interval T45 between the fourth lens and the fifth lens, an air interval T56 between the fifth lens and the sixth lens, and an air interval T67 between the sixth lens and the seventh lens satisfy 0.3< T45/(t56+t67) <1.0.
In one embodiment, the distance SL of the stop to the imaging surface on the optical axis and the distance TTL of the center of the object side surface of the first lens to the imaging surface on the optical axis satisfy 0.6< SL/TTL <0.8.
In one embodiment, the effective half-aperture DT21 of the second lens object-side surface, the effective half-aperture DT22 of the second lens image-side surface and half of the diagonal length ImgH of the effective pixel area on the imaging surface satisfy 1.0< (dt21+dt22)/ImgH <1.5.
In one embodiment, the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, the center thickness CT5 of the fifth lens, and the center thickness CT6 of the sixth lens satisfy 0.5< (et5+et6)/(CT 5+ct 6) <1.0.
In one embodiment, the second lens image-side surface is concave; the image side surface of the fifth lens is a convex surface; and the eighth lens element has a concave image-side surface.
In another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the effective focal length fx of the imaging lens in the X-axis direction and the effective focal length fy of the imaging lens in the Y-axis direction meet 0.8 < fx/fy < 1.2.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; and half of the diagonal length of the effective pixel area on the imaging surface and the effective focal length fy of the imaging lens in the Y-axis direction meet the requirement of ImgH/fy <0.5.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the effective focal length f3 of the third lens, the effective focal length f1 of the first lens and the effective focal length f5 of the fifth lens satisfy 0< f 3/(f1+f5) <0.8.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the effective focal length f4 of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy-2.3 < f4/R8< -1.3.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the radius of curvature R5 of the third lens object-side surface and the radius of curvature R1 of the first lens object-side surface satisfy 1< R5/R1<1.8.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the curvature radius R12 of the image side surface of the sixth lens, the curvature radius R13 of the object side surface of the seventh lens, the curvature radius R16 of the image side surface of the eighth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy the ratio of R12+ R13-R16)/R10 being more than or equal to 0.3 and less than or equal to 1.3.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens, and the center thickness CT4 of the fourth lens satisfy 0.5< ct1/(CT 2+ CT3+ CT 4) <1.2.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; an air interval T45 between the fourth lens and the fifth lens, an air interval T56 between the fifth lens and the sixth lens, and an air interval T67 between the sixth lens and the seventh lens satisfy 0.3< T45/(t56+t67) <1.0.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the distance SL between the diaphragm and the imaging surface on the optical axis and the distance TTL between the center of the object side surface of the first lens and the imaging surface on the optical axis satisfy 0.6< SL/TTL <0.8.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the effective half caliber DT21 of the second lens object side surface, the effective half caliber DT22 of the second lens image side surface and half ImgH of the diagonal line length of the effective pixel area on the imaging surface satisfy 1.0< (DT 21+DT 22)/ImgH <1.5.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the edge thickness ET5 of the fifth lens, the edge thickness ET6 of the sixth lens, the center thickness CT5 of the fifth lens and the center thickness CT6 of the sixth lens satisfy 0.5< (et5+et6)/(ct5+ct6) <1.0.
In still another aspect, the present application provides an imaging lens including, in order from an object side to an image side: 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, wherein the first lens has positive optical power; the third lens has positive optical power; the fourth lens has negative focal power; the fifth lens has positive optical power; at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical; the second lens is concave on the image side surface; the image side surface of the fifth lens is a convex surface; and the eighth lens element has a concave image-side surface.
The application adopts a plurality of (e.g. eight) lenses, and the imaging lens has at least one beneficial effect of long focal length, good imaging quality, low sensitivity and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens and the like.
In addition, the free curved surface is an non-rotationally symmetrical aspheric surface, and the non-rotationally symmetrical component is added on the basis of the rotationally symmetrical aspheric surface, so that the free curved surface is introduced into the lens system to be beneficial to effectively correcting off-axis meridian aberration and sagittal aberration, and the performance of the optical system is greatly improved. Therefore, the application of the free-form surface to the design and production of the camera lens has great significance.
Therefore, the application aims to provide the eight-piece imaging lens which is high in pixel, long in focus and miniaturized, and can better meet the use requirements of various special scenes.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;
Fig. 2 schematically illustrates a case where the RMS spot diameter of the imaging lens of embodiment 1 is within the first quadrant;
fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;
FIG. 4 schematically illustrates the RMS spot diameter of the imaging lens of example 2 in the first quadrant;
fig. 5 shows a schematic structural diagram of an imaging lens according to embodiment 3 of the present application;
FIG. 6 schematically illustrates the RMS spot diameter of the imaging lens of example 3 in the first quadrant;
fig. 7 shows a schematic structural diagram of an imaging lens according to embodiment 4 of the present application;
FIG. 8 schematically illustrates the RMS spot diameter of the imaging lens of example 4 in the first quadrant;
Fig. 9 shows a schematic configuration diagram of an imaging lens according to embodiment 5 of the present application;
Fig. 10 schematically illustrates a case where the RMS spot diameter of the imaging lens of embodiment 5 is in the first quadrant;
fig. 11 shows a schematic structural view of an imaging lens according to embodiment 6 of the present application;
FIG. 12 schematically illustrates the RMS spot diameter of the imaging lens of example 6 in the first quadrant;
fig. 13 shows a schematic structural view of an imaging lens according to embodiment 7 of the present application;
Fig. 14 schematically illustrates a case where the RMS spot diameter of the imaging lens of embodiment 7 is in the first quadrant;
fig. 15 shows a schematic structural view of an imaging lens according to embodiment 8 of the present application;
Fig. 16 schematically illustrates a case where the RMS spot diameter of the imaging lens of embodiment 8 is in the first quadrant;
fig. 17 shows a schematic configuration diagram of an imaging lens according to embodiment 9 of the present application;
Fig. 18 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 9 is in the first quadrant;
fig. 19 shows a schematic structural view of an imaging lens according to embodiment 10 of the present application;
FIG. 20 schematically illustrates the RMS spot diameter of the imaging lens of embodiment 10 within the first quadrant;
fig. 21 shows a schematic structural view of an imaging lens according to embodiment 11 of the present application; and
Fig. 22 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 11 is in the first quadrant.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. In each lens, the surface closest to the subject is referred to as the subject side of the lens; in each lens, the surface closest to the imaging plane is referred to as the image side of the lens.
Herein, we define a direction parallel to the optical axis as a Z-axis direction, a direction perpendicular to the Z-axis and lying in a meridian plane as a Y-axis direction, and a direction perpendicular to the Z-axis and lying in a sagittal plane as an X-axis direction. Unless otherwise indicated, each parameter symbol (e.g., radius of curvature or optical power, etc.) herein other than the parameter symbol related to the field of view represents a characteristic parameter value along the Y-axis direction of the imaging lens. For example, unless otherwise specified, the conditional expression "R1/R10" indicates a ratio of the radius of curvature R1Y in the Y-axis direction of the object side surface of the first lens to the radius of curvature R10Y in the Y-axis direction of the image side surface of the fifth lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The imaging lens according to the exemplary embodiment of the present application may include, for example, eight lenses having optical power, i.e., 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. The eight lenses are sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens may have positive optical power; the second lens may have positive or negative optical power; the third lens may have positive optical power; the fourth lens may have negative optical power; the fifth lens may have positive optical power; the sixth lens may have positive or negative optical power; the seventh lens may have positive or negative optical power; the eighth lens may have positive optical power or negative optical power.
The image quality may be further improved by setting the object side surface and/or the image side surface of at least one of the first lens to the eighth lens to be an aspherical surface which is non-rotationally symmetrical. The non-rotationally symmetrical aspheric surface is a free-form surface, and the non-rotationally symmetrical component is added on the basis of the rotationally symmetrical aspheric surface, so that the introduction of the non-rotationally symmetrical aspheric surface in the lens system is beneficial to effectively correcting off-axis meridian aberration and sagittal aberration, and greatly improving the performance of the optical system.
In an exemplary embodiment, the first lens may have positive optical power, and an object side surface thereof may be convex.
In an exemplary embodiment, the second lens image-side surface may be concave.
In an exemplary embodiment, the third lens may have positive optical power, and an object side surface thereof may be convex.
In an exemplary embodiment, the fourth lens may have negative optical power, and an image side surface thereof may be concave.
In an exemplary embodiment, the fifth lens may have positive optical power, and an image side surface thereof may be convex.
In an exemplary embodiment, the sixth lens image side surface may be convex.
In an exemplary embodiment, the object side surface of the seventh lens may be concave.
In an exemplary embodiment, the image side surface of the eighth lens may be concave.
In an exemplary embodiment, at least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical.
The focal power of the first lens is reasonably controlled, so that the first lens has good processability, the imaging system has the advantage of a large field angle, the incidence angle of the chief ray of the imaging system on the image surface is reduced, and the relative illuminance of the image surface is improved. The focal power of the third lens, the fourth lens and the fifth lens is reasonably controlled, so that the off-axis aberration of the optical lens group can be corrected, and the imaging quality can be improved. By introducing an aspherical surface which is not rotationally symmetrical, the off-axis meridian aberration and the sagittal aberration of the imaging lens are corrected, and further image quality improvement can be obtained.
In an exemplary embodiment, the imaging lens of the present application may satisfy a condition of TTL/(fx+fy) ×2<1.1, where TTL is a distance between a center of an object side surface of the first lens and an imaging surface of the imaging lens on the optical axis, fx is an effective focal length in an X-axis direction of the imaging lens, and fy is an effective focal length in a Y-axis direction of the imaging lens. More specifically, TTL, fx and fy may further satisfy TTL/(fx+fy) ×2+.ltoreq.1.08. The ratio of the total length to the focal length in the XY direction is controlled, so that the imaging lens is beneficial to ensuring miniaturization of the imaging lens under the condition of taking the long-focus characteristic into consideration.
In an exemplary embodiment, the imaging lens of the present application may satisfy a conditional expression of 0.8 < fx/fy < 1.2, where fx is an effective focal length in an X-axis direction of the imaging lens and fy is an effective focal length in a Y-axis direction of the imaging lens. More specifically, fx and fx may further satisfy 0.80. Ltoreq.fx/fy. Ltoreq.1.25. By controlling the ratio of focal lengths in the X and Y directions, the uniformity of the image quality of the lens in the X and Y directions and the whole image surface can be ensured, and the stability of the image quality can be maintained.
In an exemplary embodiment, the imaging lens of the present application may satisfy a conditional expression ImgH/fy <0.5, where ImgH is half of the diagonal length of an effective pixel area on an imaging surface, and fy is an effective focal length in the Y-axis direction of the imaging lens. More specifically, imgH and fy may further satisfy ImgH/fy.ltoreq.0.42. The ratio of the image height to the effective focal length in the Y-axis direction is controlled, so that the long focal length characteristic of the lens can be ensured, and the lens has small depth of field and large magnification; meanwhile, the total length of the imaging lens is shortened, and miniaturization of the imaging lens is guaranteed.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0< f 3/(f1+f5) <0.8, where f3 is an effective focal length of the third lens, f1 is an effective focal length of the first lens, and f5 is an effective focal length of the fifth lens. More specifically, f3, f1 and f5 may further satisfy 0.04.ltoreq.f3/(f1+f5). Ltoreq.0.79. By meeting the conditional expression, the astigmatic quantity of the imaging system can be effectively controlled, so that the image quality of the system is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition-2.3 < f4/R8< -1.3, where f4 is an effective focal length of the fourth lens and R8 is a radius of curvature of an image side surface of the fourth lens. More specifically, f4 and R8 may further satisfy-2.07.ltoreq.f4/R8.ltoreq.1.51. The curvature of field of the subsequent lens is balanced by controlling the ratio of the effective focal length of the fourth lens to the curvature radius of the image side of the fourth lens so that the curvature of field of the image side is within a reasonable range.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 1< R5/R1<1.8, where R5 is a radius of curvature of the third lens object side surface and R1 is a radius of curvature of the first lens object side surface. More specifically, R5 and R1 may further satisfy 1.08.ltoreq.R5/R1.ltoreq.1.65. The coma contribution rate of the first lens and the third lens is controlled within a reasonable range by restricting the range of the object side surface curvature radius of the first lens and the object side surface curvature radius of the third lens, so that coma generated by the front end lens component can be well balanced, and good imaging quality is obtained.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression of 0.3+.R12+R13-R16)/R10+.1.3, wherein R12 is the radius of curvature of the image side of the sixth lens element, R13 is the radius of curvature of the object side of the seventh lens element, R16 is the radius of curvature of the image side of the eighth lens element, and R10 is the radius of curvature of the image side of the fifth lens element. More specifically, R12, R13, R16 and R10 may further satisfy 0.31.ltoreq.R12+R13-R16)/R10.ltoreq.1.30. The bending direction and the bending degree of the four lenses can be controlled by reasonably controlling the conditional expression within a reasonable range, so that the focal power and the field curvature are effectively controlled, and the overall image quality of the system is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.5< ct1/(CT 2+ct3+ct 4) <1.2, where CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, and CT4 is the center thickness of the fourth lens. More specifically, CT1, CT2, CT3 and CT4 may further satisfy 0.71.ltoreq.CT1/(CT2+CT3+CT4). Ltoreq.1.08. The conditional expression is controlled within a reasonable range, so that the lens processing and assembling are facilitated, meanwhile, the distortion of the system can be controlled, and the overall image quality is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.3< T45/(t56+t67) <1.0, where T45 is an air space between the fourth lens and the fifth lens, T56 is an air space between the fifth lens and the sixth lens, and T67 is an air space between the sixth lens and the seventh lens. More specifically, T45, T56 and T67 may further satisfy 0.37.ltoreq.T45/(T56+T67). Ltoreq.0.94. The positions of the fourth lens and the seventh lens can be effectively limited by controlling the conditional expression within a reasonable range, so that the compact lens structure is realized, off-axis aberration is corrected, and the overall image quality of the system is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy a conditional expression of 0.6< SL/TTL <0.8, where SL is a distance on the optical axis between a diaphragm and an imaging surface of the imaging lens, and TTL is a distance on the optical axis between a center of an object side surface of the first lens and the imaging surface of the imaging lens. More specifically, SL and TTL may further satisfy 0.72. Ltoreq.SL/TTL.ltoreq.0.79. By selecting an appropriate stop position, aberrations (coma, astigmatism, distortion, and axial chromatic aberration) associated with the stop of the optical imaging lens can be effectively corrected.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition of 1.0< (dt21+dt22)/ImgH <1.5, where DT21 is the effective half-caliber of the object side surface of the second lens, DT22 is the effective half-caliber of the image side surface of the second lens, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface. More specifically, DT21, DT22 and ImgH may further satisfy 1.01.ltoreq.DT 21+DT 22/ImgH.ltoreq.1.43. By controlling the conditional expression within a reasonable range, the shape and the size of the second lens can be controlled within a reasonable range, which is beneficial to miniaturization of the imaging lens.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression of 0.5< (et5+et6)/(ct5+ct6) <1.0, where ET5 is an edge thickness of the fifth lens, ET6 is an edge thickness of the sixth lens, CT5 is a center thickness of the fifth lens, and CT6 is a center thickness of the sixth lens. More specifically, ET5, ET6, CT5 and CT6 can further satisfy 0.64.ltoreq.ET 5+ET 6)/(CT 5+CT 6.ltoreq.0.89. The ratio of the edge thickness to the center thickness of the fifth lens and the sixth lens is restrained, so that the shape and thickness ratio of the fifth lens and the sixth lens can be effectively controlled, the residual distortion range after balance can be reasonably controlled, and the optical imaging lens has good distortion performance.
Optionally, the 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 imaging lens according to the above embodiment of the present application may employ a plurality of lenses, for example, eight lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the imaging quality can be improved. In addition, by introducing an aspherical surface which is not rotationally symmetrical, the off-axis meridian aberration and the sagittal aberration of the imaging lens are corrected, and further image quality improvement can be obtained.
In the embodiment of the present application, aspherical mirror surfaces are often used as the mirror surfaces of the respective lenses. 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 may be aspherical.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although eight lenses are described as an example in the embodiment, the imaging lens is not limited to include eight lenses. The imaging lens may also include other numbers of lenses, if desired.
Specific examples of the imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 and 2. Fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 1, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 1
As can be seen from table 1, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A 4、A6、A8、A10、A12、A14、A16、A18 and A 20 that can be used for each of the aspherical mirrors S1-S14 in example 1.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -7.5227E-02 -5.2385E-04 4.4338E-03 8.5003E-04 2.8317E-05 -1.2455E-04 -2.9547E-05 -3.0647E-05 0.0000E+00
S2 -1.1675E-02 5.2605E-03 3.7336E-03 -1.5992E-03 9.9535E-04 -6.4572E-04 1.5519E-04 -2.4704E-05 0.0000E+00
S3 5.3323E-03 -3.8611E-03 1.3376E-03 -9.8837E-04 1.3165E-03 -5.3326E-04 2.3342E-05 2.1984E-05 0.0000E+00
S4 -1.0240E-03 9.9096E-04 4.0371E-04 2.1017E-04 6.3308E-04 -2.0528E-04 -7.0461E-05 2.9314E-05 0.0000E+00
S5 -2.6054E-02 -9.1866E-03 -9.6545E-04 -4.4317E-04 1.1151E-04 -6.6300E-05 -7.8269E-05 -1.7958E-05 0.0000E+00
S6 -2.1702E-02 -1.0584E-02 1.7576E-03 -3.1331E-04 -3.3136E-05 1.4397E-05 -2.2186E-05 -1.8207E-06 0.0000E+00
S7 9.5056E-04 1.4236E-04 1.0271E-03 -2.2414E-04 1.2183E-05 6.2494E-06 -7.5495E-06 1.8350E-06 0.0000E+00
S8 1.0030E-03 3.7472E-03 4.2421E-04 -6.6212E-05 3.0855E-06 4.0967E-06 -4.9282E-06 6.7332E-07 0.0000E+00
S9 -4.7253E-03 7.3187E-03 2.4944E-03 4.8886E-04 1.5052E-04 6.7510E-06 -1.7480E-05 -1.0162E-05 0.0000E+00
S10 -1.5320E-01 3.5029E-03 3.7228E-03 1.6769E-03 7.5556E-04 3.9073E-04 1.1074E-04 4.6711E-05 0.0000E+00
S11 -2.5374E-01 4.9781E-03 6.8859E-03 1.7802E-03 1.1347E-03 5.5114E-04 7.8864E-05 -6.1978E-05 0.0000E+00
S12 -8.0423E-02 2.0954E-02 1.0636E-02 4.4302E-04 1.6870E-03 2.5029E-04 -1.7983E-04 -2.8924E-04 0.0000E+00
S13 -5.5801E-02 -2.0544E-02 3.0768E-02 -6.0008E-03 5.1988E-03 -7.2722E-04 7.1848E-04 -1.1252E-03 0.0000E+00
S14 -5.5991E-01 2.0277E-03 1.2676E-02 -9.9540E-03 2.4575E-03 -8.9761E-04 -1.5923E-04 -9.8838E-04 0.0000E+00
TABLE 2
As can be further seen from table 1, the object-side surface S15 and the image-side surface S16 of the eighth lens element E8 are non-rotationally symmetric aspheric surfaces (i.e., AAS surfaces), and the surface shape of the non-rotationally symmetric aspheric surfaces can be defined by, but not limited to, the following non-rotationally symmetric aspheric surface formula:
Wherein z is the sagittal height of the plane parallel to the z-axis direction; cx and Cy are curvatures of the vertices of the X, Y direction faces respectively; kx and Ky are X, Y direction cone coefficients respectively; AR, BR, CR, DR, ER, FR, GR, HR, JR are 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients in the aspheric rotationally symmetric component, respectively; AP, BP, CP, DP, EP, FP, GP, HP, JP are the 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients, respectively, in the aspheric non-rotationally symmetric component.
Table 3 below gives AR, AP, BR, BP, CR, CP, DR, DP, ER, EP coefficients for the non-rotationally symmetrical aspherical surfaces S15 and S16 that can be used in example 1.
TABLE 3 Table 3
Table 4 below gives FR, FP, GR, GP, HR, HP, JR, JP coefficients for the non-rotationally symmetrical aspherical surfaces S15 and S16 that can be used in example 1.
TABLE 4 Table 4
Table 5 shows the effective focal lengths f1 to f8 of the respective lenses in embodiment 1, the effective focal length fx in the X-axis direction of the imaging lens, the effective focal length fy in the Y-axis direction of the imaging lens, the total optical length TTL of the imaging lens (i.e., the distance on the optical axis from the object side surface S1 to the imaging surface S19 of the first lens E1), and the maximum half field angle Semi-FOV.
f1(mm) 5.34 f7(mm) -5.05
f2(mm) 181.32 f8(mm) -11.26
f3(mm) 7.55 fx(mm) 5.84
f4(mm) -3.47 fy(mm) 7.30
f5(mm) 8.11 TTL(mm) 7.10
f6(mm) 47.24 Semi-FOV(°) 23.3
TABLE 5
The imaging lens in embodiment 1 satisfies:
TTL/(fx+fy) ×2=1.08, where TTL is a distance between a center of an object side surface of the first lens and an imaging surface of the imaging lens on the optical axis, fx is an effective focal length in an X-axis direction of the imaging lens, and fy is an effective focal length in a Y-axis direction of the imaging lens.
Fx/fy=0.80, where fx is an effective focal length in the X-axis direction of the imaging lens, and fy is an effective focal length in the Y-axis direction of the imaging lens.
ImgH/fy=0.42, where ImgH is half of the diagonal length of the effective pixel area on the imaging plane, and fy is the effective focal length in the Y-axis direction of the imaging lens.
F3/(f1+f5) =0.56, where f3 is the effective focal length of the third lens, f1 is the effective focal length of the first lens, and f5 is the effective focal length of the fifth lens.
F4/r8= -1.73, where f4 is the effective focal length of the fourth lens element and R8 is the radius of curvature of the image-side surface of the fourth lens element.
R5/r1=1.23, where R5 is the radius of curvature of the third lens object-side surface and R1 is the radius of curvature of the first lens object-side surface.
(R12+r13—r16)/r10=0.58, where R12 is a radius of curvature of the sixth lens element image side, R13 is a radius of curvature of the seventh lens element object side, R16 is a radius of curvature of the eighth lens element image side, and R10 is a radius of curvature of the fifth lens element image side.
CT 1/(CT 2+ CT3+ CT 4) =0.87, wherein CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, and CT4 is the center thickness of the fourth lens.
T45/(t56+t67) =0.75, where T45 is an air space between the fourth lens and the fifth lens, T56 is an air space between the fifth lens and the sixth lens, and T67 is an air space between the sixth lens and the seventh lens.
SL/ttl=0.77, where SL is a distance between a stop and an imaging surface of the imaging lens on the optical axis, and TTL is a distance between a center of an object side surface of the first lens and the imaging surface of the imaging lens on the optical axis.
(Dt21+dt22)/ImgH <1.01, wherein DT21 is the effective half-caliber of the object side surface of the second lens, DT22 is the effective half-caliber of the image side surface of the second lens, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface.
(Et5+et6)/(ct5+ct6) =0.84, wherein ET5 is the edge thickness of the fifth lens, ET6 is the edge thickness of the sixth lens, CT5 is the center thickness of the fifth lens, and CT6 is the center thickness of the sixth lens.
Fig. 2 shows the magnitude of RMS spot diameters of the imaging lens of example 1 at different angles of view in the first quadrant. According to fig. 2, embodiment 1 provides a high-pixel long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 2
An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 and 4. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration of an imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 6 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 2, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 6
As can be seen from table 6, in example 2, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6, the seventh lens element E7 and the eighth lens element E8 are aspheric; the object side surface S3 and the image side surface S4 of the second lens element E2 are aspheric with non-rotational symmetry.
Table 7 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. Tables 8 and 9 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S3 and S4 in embodiment 2, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.0123E-01 8.2027E-03 6.3512E-03 -1.8586E-04 -1.9419E-03 -1.0395E-03 -3.2474E-04 -7.8586E-05 0.0000E+00
S2 7.2272E-04 1.1445E-02 2.7577E-03 -2.5407E-03 -1.3598E-04 -6.2646E-04 7.6884E-04 -8.1383E-05 0.0000E+00
S5 -3.6637E-02 -1.2225E-02 -2.7084E-03 7.8241E-05 -9.8112E-04 -4.7326E-04 -1.8626E-04 -6.7984E-05 0.0000E+00
S6 -3.3417E-02 -1.4466E-02 2.3464E-03 -6.4090E-04 -5.3025E-04 1.1364E-04 -2.5848E-05 2.6632E-06 0.0000E+00
S7 4.1255E-03 1.1660E-03 1.4658E-03 -9.2114E-04 2.2831E-05 1.4523E-04 2.4177E-05 3.1929E-05 0.0000E+00
S8 4.3863E-03 7.7202E-03 4.0597E-04 -5.1049E-04 3.2775E-05 9.9120E-05 1.5344E-05 2.5512E-05 0.0000E+00
S9 -3.3941E-05 9.0254E-03 3.2192E-03 4.6571E-04 2.5881E-04 2.4681E-05 -6.1654E-05 -3.9540E-05 0.0000E+00
S10 -1.4794E-01 -1.1079E-03 4.2891E-03 1.5985E-03 5.8848E-04 4.4624E-04 9.3775E-05 6.9735E-05 0.0000E+00
S11 -2.5859E-01 8.3883E-03 1.4171E-02 5.3951E-03 1.4497E-04 -2.9233E-05 -2.8980E-04 -4.0781E-05 0.0000E+00
S12 -8.2269E-02 2.6758E-02 6.8484E-03 1.7710E-03 -1.6576E-03 -4.1643E-04 -4.4931E-04 2.1997E-04 0.0000E+00
S13 -8.3881E-02 -2.1345E-02 1.5021E-02 -5.1361E-03 1.3217E-03 -9.5313E-05 7.4742E-05 -2.7236E-05 0.0000E+00
S14 -2.9537E-01 -1.0701E-02 3.1360E-02 -1.3247E-02 3.9210E-03 -1.2363E-03 -7.7712E-06 2.3088E-04 0.0000E+00
S15 -6.7415E-01 1.3244E-01 -2.2768E-02 1.0380E-02 -1.1085E-02 1.1006E-02 -3.4701E-03 3.6634E-04 0.0000E+00
S16 -9.9994E-01 1.9700E-01 -5.4994E-02 2.3612E-02 -4.9205E-03 1.0897E-02 -3.8418E-03 -3.2576E-03 0.0000E+00
TABLE 7
TABLE 8
AAS surface FR FP GR GP HR HP JR JP
S3 -5.5274E-03 6.4126E-04 4.6979E-04 -6.1102E-04 -1.1213E-05 -1.8621E-02 1.3551E-20 1.7836E+01
S4 2.6380E-03 3.9190E-03 -4.3047E-04 5.0823E-04 1.5550E-09 1.5039E+00 3.4910E-06 -7.0995E-02
TABLE 9
Table 10 shows the effective focal lengths f1 to f8 of the respective lenses in embodiment 2, the effective focal length fx in the X-axis direction of the imaging lens, the effective focal length fy in the Y-axis direction of the imaging lens, the total optical length TTL of the imaging lens, and the maximum half field angle Semi-FOV.
f1(mm) 5.38 f7(mm) -5.71
f2(mm) -462.58 f8(mm) -3.35
f3(mm) 7.25 fx(mm) 6.31
f4(mm) -3.51 fy(mm) 7.00
f5(mm) 7.99 TTL(mm) 7.10
f6(mm) 248.41 Semi-FOV(°) 19.1
Table 10
Fig. 4 shows the magnitude of RMS spot diameters of the imaging lens of example 2 at different angles of view in the first quadrant. As can be seen from fig. 4, embodiment 2 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 3
An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 and 6. Fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 11 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 3, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 11
As can be seen from table 11, in example 3, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7 are aspheric; the object side surface S15 and the image side surface S16 of the eighth lens element E8 are aspheric with non-rotational symmetry.
Table 12 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. Tables 13 and 14 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S15 and S16 in embodiment 3, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Flour with a plurality of grooves A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.0805E-01 1.1622E-02 9.4597E-03 -9.0844E-04 -2.8446E-03 -1.4558E-03 -3.6336E-04 -5.7108E-05 0.0000E+00
S2 -4.2621E-03 1.4709E-02 1.0732E-03 -3.5992E-03 -1.1973E-04 -7.4975E-04 1.5859E-04 -1.6822E-04 0.0000E+00
S3 2.9269E-03 -3.4060E-03 2.7950E-03 3.3951E-04 2.2230E-03 -8.2645E-04 2.0389E-04 3.9289E-05 0.0000E+00
S4 3.7110E-03 6.6540E-03 3.3212E-03 3.5596E-04 1.2145E-04 -1.4658E-03 -1.9392E-04 2.0876E-05 0.0000E+00
S5 -3.3604E-02 -1.2894E-02 -3.1077E-03 -7.2901E-04 -2.7627E-04 -6.1009E-04 -2.6394E-04 -6.4141E-05 0.0000E+00
S6 -3.3900E-02 -1.2717E-02 1.6316E-03 -4.0807E-04 -2.5483E-04 1.7535E-05 -5.4825E-05 1.2919E-05 0.0000E+00
S7 2.4841E-03 8.9177E-04 1.5367E-03 -7.2180E-04 -3.9131E-05 1.0716E-05 -2.4042E-05 1.1506E-05 0.0000E+00
S8 5.9684E-03 6.3267E-03 7.5531E-04 -4.1629E-04 -2.3276E-05 1.8055E-06 -1.1671E-05 1.1310E-05 0.0000E+00
S9 3.2406E-03 8.4608E-03 1.9144E-03 2.2083E-04 1.3852E-04 4.3753E-05 -8.4214E-07 -1.3422E-05 0.0000E+00
S10 -1.5610E-01 -5.2635E-04 1.9579E-03 7.7607E-04 3.7409E-04 1.5904E-04 6.3488E-05 1.1600E-05 0.0000E+00
S11 -3.2615E-01 6.3575E-03 1.4374E-02 4.3089E-03 1.5818E-03 -1.0762E-04 -7.3278E-05 -1.0358E-04 0.0000E+00
S12 -1.2287E-01 1.9171E-02 1.9296E-02 2.8837E-03 2.9264E-03 -6.1009E-04 -1.3622E-04 -2.9634E-04 0.0000E+00
S13 -1.8844E-01 4.9741E-03 3.5049E-02 -8.6548E-04 7.4074E-03 -2.0120E-03 -5.3954E-04 -7.4703E-04 0.0000E+00
S14 -6.8531E-01 4.1153E-02 8.7855E-03 -5.3994E-03 3.2353E-03 -2.0789E-03 -1.1459E-04 -2.2491E-04 0.0000E+00
Table 12
TABLE 13
AAS surface FR FP GR GP HR HP JR JP
S15 2.4675E-04 4.4862E-05 -1.6271E-05 -3.6361E-05 4.5228E-07 -9.9110E-05 4.2886E-11 2.3302E-01
S16 -3.6713E-06 -4.9151E-04 6.4793E-07 1.6682E-03 -1.2298E-08 -3.0052E-02 -9.0510E-11 2.6002E-01
TABLE 14
Table 15 shows the effective focal lengths f1 to f8 of the respective lenses in embodiment 3, the effective focal length fx in the X-axis direction of the imaging lens, the effective focal length fy in the Y-axis direction of the imaging lens, the total optical length TTL of the imaging lens, and the maximum half field angle Semi-FOV.
f1(mm) 5.29 f7(mm) -4.51
f2(mm) 2190.98 f8(mm) -18.06
f3(mm) 7.78 fx(mm) 9.55
f4(mm) -3.58 fy(mm) 7.64
f5(mm) 7.97 TTL(mm) 7.10
f6(mm) 42.95 Semi-FOV(°) 19.1
TABLE 15
Fig. 6 shows the magnitude of RMS spot diameter at different angles of view in the first quadrant for the imaging lens of example 3. According to fig. 6, embodiment 3 provides a high-pixel long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 4
An imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 and 8. Fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 16 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 4, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 16
As can be seen from table 16, in example 4, the object-side surface and the image-side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5, the seventh lens element E7 and the eighth lens element E8, and the image-side surface S12 of the sixth lens element E6 are aspheric; the object side surface S11 of the sixth lens element E6 is an aspheric surface with non-rotational symmetry.
Table 17 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. Tables 18 and 19 show the rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S11 in embodiment 4, in which the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -6.8524E-02 -1.3115E-03 2.1631E-03 7.7963E-04 1.6857E-04 -2.9029E-05 -1.2808E-05 -3.1002E-05 0.0000E+00
S2 -1.1322E-02 3.4874E-03 3.8495E-03 -1.1240E-03 7.6014E-04 -5.6306E-04 1.1521E-04 -1.2504E-05 0.0000E+00
S3 4.4541E-03 -4.0812E-03 1.9644E-03 -9.3455E-04 1.3174E-03 -5.8288E-04 1.2014E-05 2.8871E-05 0.0000E+00
S4 -4.9656E-04 1.7053E-04 -5.2257E-04 5.8291E-04 8.0223E-04 -2.4054E-04 -6.9639E-05 2.3104E-05 0.0000E+00
S5 -3.0308E-02 -1.1100E-02 -1.2263E-03 3.2902E-04 1.6056E-04 -5.7797E-05 -8.5914E-05 -4.1134E-05 0.0000E+00
S6 -2.5645E-02 -1.1937E-02 2.6253E-03 -4.0957E-04 -1.3398E-04 6.6178E-05 -4.9088E-05 -1.3975E-07 0.0000E+00
S7 1.4222E-03 -1.2536E-04 1.5184E-03 -5.3461E-04 1.6562E-05 2.8438E-05 -1.8582E-05 4.7179E-06 0.0000E+00
S8 2.0781E-03 4.5794E-03 5.3381E-04 -2.8698E-04 2.4525E-06 1.3995E-05 -1.7779E-05 8.1366E-06 0.0000E+00
S9 7.0370E-04 1.1967E-02 3.3729E-03 3.1076E-04 1.3088E-04 -1.0237E-06 -1.0408E-05 -1.5998E-05 0.0000E+00
S10 -1.6178E-01 5.7394E-03 6.3329E-03 1.9161E-03 8.1344E-04 3.6171E-04 1.3602E-04 4.1022E-05 0.0000E+00
S12 -1.1346E-01 2.4274E-02 7.4865E-03 3.1554E-03 1.5214E-03 -3.1979E-04 -2.9462E-04 -8.5296E-05 0.0000E+00
S13 -9.2524E-02 1.5003E-02 3.3055E-02 -3.7240E-03 6.2957E-03 -3.8506E-04 -2.2415E-04 -1.4010E-04 0.0000E+00
S14 -3.4016E-01 -4.6619E-03 3.8978E-02 -1.0054E-02 3.5079E-03 2.7849E-04 -8.8748E-05 6.2858E-04 0.0000E+00
S15 -6.1518E-01 1.2601E-01 -2.6715E-02 1.6306E-02 -1.2545E-02 1.3136E-02 -7.5892E-03 -9.8116E-05 0.0000E+00
S16 -9.6035E-01 1.7914E-01 -5.3544E-02 1.4375E-02 -8.1044E-03 1.0242E-02 -4.3230E-03 -3.4767E-03 0.0000E+00
TABLE 17
TABLE 18
AAS surface FR FP GR GP HR HP JR JP
S11 -3.0984E-02 -5.5579E-03 1.4860E-02 4.4122E-03 -2.4170E-03 1.0003E-02 4.0598E-06 -3.8789E-01
TABLE 19
Table 20 shows the effective focal lengths f1 to f8 of the respective lenses in embodiment 4, the effective focal length fx in the X-axis direction of the imaging lens, the effective focal length fy in the Y-axis direction of the imaging lens, the total optical length TTL of the imaging lens, and the maximum half field angle Semi-FOV.
Table 20
Fig. 8 shows the magnitude of RMS spot diameter at different angles of view in the first quadrant for the imaging lens of example 4. As can be seen from fig. 8, embodiment 4 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 5
An imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 and 10. Fig. 9 shows a schematic configuration of an imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 21 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 5, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 21
As can be seen from table 21, in example 5, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the sixth lens element E6, the seventh lens element E7 and the eighth lens element E8, and the image side surface S10 of the fifth lens element E5 are aspheric; the object side surface S9 of the fifth lens element E5 is an aspheric surface with non-rotational symmetry.
Table 22 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. Tables 23 and 24 show the rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S9 in embodiment 5, in which the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
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Table 22
Table 23
AAS surface FR FP GR GP HR HP JR JP
S9 -7.9358E-02 2.8496E-03 3.3774E-02 -9.3143E-03 -5.3033E-03 -1.4169E-02 -1.4802E-06 -7.6640E-01
Table 24
Table 25 shows effective focal lengths f1 to f8 of the respective lenses in embodiment 5, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, an optical total length TTL of the imaging lens, and a maximum half field angle Semi-FOV.
f1(mm) 5.31 f7(mm) -6.17
f2(mm) -7699.85 f8(mm) -8.64
f3(mm) 7.33 fx(mm) 7.61
f4(mm) -3.44 fy(mm) 7.15
f5(mm) 7.97 TTL(mm) 7.10
f6(mm) 30.31 Semi-FOV(°) 19.1
Table 25
Fig. 10 shows the magnitude of RMS spot diameter of the imaging lens of example 5 at different angles of view in the first quadrant. As can be seen from fig. 10, embodiment 5 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 6
An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 and 12. Fig. 11 shows a schematic structural diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 26 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of example 6, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 26
As can be seen from table 26, in example 6, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6, the seventh lens element E7 and the eighth lens element E8 are aspheric; the object side surfaces S1 and S2 of the first lens E1 are aspherical surfaces which are non-rotationally symmetrical.
Table 27 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. Tables 28 and 29 show rotationally symmetric components and higher-order coefficients of rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S1 and S2 in embodiment 6, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 1.3740E-02 -3.6547E-03 4.3327E-04 -2.1565E-03 1.4299E-03 -5.3296E-04 -2.3274E-04 -8.1306E-05 0.0000E+00
S4 -8.0081E-03 -6.4718E-04 1.1136E-03 -2.6904E-04 1.4502E-03 -7.8126E-05 -3.1968E-04 -5.7859E-05 0.0000E+00
S5 -1.6282E-02 -2.1197E-03 -1.9557E-04 2.0938E-04 6.2396E-04 2.0782E-04 -1.3879E-04 -9.0113E-05 0.0000E+00
S6 -3.3745E-02 -7.3350E-03 2.5538E-03 -4.8809E-04 -1.6870E-04 2.2369E-04 -8.0326E-05 -1.4342E-05 0.0000E+00
S7 -5.3249E-03 7.8307E-04 2.0038E-03 -7.7477E-04 -4.3215E-05 9.9541E-05 -5.4004E-05 1.1504E-05 0.0000E+00
S8 7.0779E-03 5.8238E-03 7.1608E-04 -3.9018E-04 -1.9224E-05 4.2439E-05 -3.8027E-05 1.6597E-05 0.0000E+00
S9 -1.0620E-02 4.2517E-03 7.1249E-04 2.4296E-05 1.4603E-04 5.7628E-05 9.4536E-06 -1.3327E-05 0.0000E+00
S10 -1.6703E-01 -6.0516E-03 1.0552E-05 4.2603E-04 2.0018E-04 1.5305E-04 1.5198E-05 2.1855E-05 0.0000E+00
S11 -2.5838E-01 2.6429E-03 5.8555E-03 2.4511E-03 8.9247E-04 9.2680E-05 3.8704E-05 -3.3473E-05 0.0000E+00
S12 -1.0343E-01 3.1931E-02 1.0810E-02 2.1213E-03 1.5477E-03 -5.6869E-04 -3.3696E-06 -1.9669E-04 0.0000E+00
S13 -2.1202E-01 1.3769E-02 4.8478E-02 -9.0050E-03 1.2869E-02 -6.5346E-03 -3.3914E-04 -1.4431E-03 0.0000E+00
S14 -8.0064E-01 3.4231E-02 3.6274E-02 -2.0783E-02 9.4422E-03 -7.5934E-03 -4.3566E-04 -1.6927E-03 0.0000E+00
S15 -8.2072E-01 2.3094E-01 -3.9681E-02 5.3160E-03 -1.0503E-02 1.0971E-02 -9.2056E-03 9.1752E-04 0.0000E+00
S16 -1.0117E+00 2.5141E-01 -7.3757E-02 2.3617E-02 -1.4267E-02 9.4886E-03 -4.9349E-03 -1.7190E-03 0.0000E+00
Table 27
Table 28
AAS surface FR FP GR GP HR HP JR JP
S1 -5.1517E-04 5.9957E-03 1.2286E-04 7.8195E-04 -1.1667E-05 -1.4935E-02 2.0378E-09 -3.5365E-01
S2 -6.9030E-03 -1.3514E-04 7.8295E-04 -1.3145E-03 -3.8439E-05 -5.2747E-04 -4.5501E-11 -1.0087E+00
Table 29
Table 30 shows the effective focal lengths f1 to f8 of the respective lenses in embodiment 6, the effective focal length fx in the X-axis direction of the imaging lens, the effective focal length fy in the Y-axis direction of the imaging lens, the total optical length TTL of the imaging lens, and the maximum half field angle Semi-FOV.
f1(mm) 5.30 f7(mm) -5.17
f2(mm) -529.88 f8(mm) -2.83
f3(mm) 8.43 fx(mm) 6.19
f4(mm) -3.78 fy(mm) 7.00
f5(mm) 8.21 TTL(mm) 7.10
f6(mm) -270.47 Semi-FOV(°) 19.1
Table 30
Fig. 12 shows the magnitude of RMS spot diameter at different angles of view in the first quadrant for the imaging lens of example 6. As can be seen from fig. 12, embodiment 6 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 7
An imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 and 14.
Fig. 13 shows a schematic structural diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 31 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 7, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 31
As can be seen from table 31, in example 7, the first lens E1, the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are all aspherical surfaces; the object side surface S7 and the image side surface S8 of the fourth lens element E4 are aspheric with non-rotational symmetry.
Table 32 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 33 and 34 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S7 and S8 in embodiment 7, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -7.6161E-02 3.6521E-04 3.4016E-03 1.9491E-03 4.9740E-04 1.3371E-04 -4.8928E-05 -5.3598E-05 0.0000E+00
S2 -1.0309E-02 3.8938E-03 2.5338E-03 1.4057E-04 1.0490E-03 -5.0803E-04 -5.1607E-05 -1.7492E-05 0.0000E+00
S3 -1.3787E-03 -5.8853E-03 2.3472E-03 -1.1993E-03 1.8774E-03 -7.4429E-04 -3.5519E-05 7.2083E-06 0.0000E+00
S4 -4.9329E-03 3.5938E-04 1.8118E-03 9.0240E-04 8.5464E-04 -3.2488E-04 -5.4097E-05 7.5096E-06 0.0000E+00
S5 -3.6076E-02 -7.4145E-03 -1.7599E-03 1.4683E-03 -2.1352E-04 -9.6297E-05 -1.0134E-04 -4.2600E-05 0.0000E+00
S6 -3.1732E-02 -1.3088E-02 1.8783E-03 -5.7275E-05 -1.4796E-04 2.3514E-05 -2.2527E-05 -7.9602E-06 0.0000E+00
S9 -1.4250E-02 5.1549E-03 1.4661E-03 4.1514E-04 1.5193E-04 3.4071E-05 -2.3670E-05 -5.7687E-06 0.0000E+00
S10 -1.4226E-01 3.4770E-04 2.6648E-03 1.3314E-03 5.7299E-04 1.9234E-04 5.8477E-05 1.3053E-05 0.0000E+00
S11 -2.4486E-01 3.0946E-03 6.3391E-03 2.8591E-03 9.9739E-04 5.2793E-05 -5.8819E-05 -3.1638E-05 0.0000E+00
S12 -9.8183E-02 3.3841E-02 1.0827E-02 6.9071E-04 1.6281E-03 -1.8149E-04 1.1695E-04 -1.6755E-04 0.0000E+00
S13 -1.6075E-01 -1.8741E-02 3.5432E-02 -1.5502E-02 8.7803E-03 -7.4604E-04 1.5983E-03 -4.8721E-04 0.0000E+00
S14 -3.7413E-01 2.0148E-02 2.5932E-02 -2.1672E-02 8.8771E-03 -2.8968E-03 3.3263E-04 -1.1548E-03 0.0000E+00
S15 -9.2564E-01 2.7443E-01 -6.2865E-02 1.8673E-02 -5.6985E-03 6.5971E-03 -9.4062E-03 3.0699E-03 0.0000E+00
S16 -1.1978E+00 1.6850E-01 -4.8627E-02 1.5788E-02 -7.2729E-03 1.0552E-02 -3.3361E-03 -6.7806E-04 0.0000E+00
Table 32
Table 33
AAS surface FR FP GR GP HR HP JR JP
S7 -8.2836E-02 6.1435E-03 3.3894E-02 -4.3031E-03 -6.3332E-03 -3.0215E-02 1.9983E-04 2.9511E-02
S8 -8.8711E-02 -6.3630E-03 3.4548E-02 4.0154E-04 -5.8125E-03 3.5584E-02 2.7455E-11 4.5051E+00
Watch 34
Table 35 shows the effective focal lengths f1 to f8 of the respective lenses in embodiment 7, the effective focal length fx in the X-axis direction of the imaging lens, the effective focal length fy in the Y-axis direction of the imaging lens, the total optical length TTL of the imaging lens, and the maximum half field angle Semi-FOV.
f1(mm) 5.46 f7(mm) -7.28
f2(mm) -306.17 f8(mm) -7.14
f3(mm) 7.58 fx(mm) 7.03
f4(mm) -3.66 fy(mm) 7.78
f5(mm) 7.79 TTL(mm) 7.10
f6(mm) -2331.13 Semi-FOV(°) 19.6
Table 35
Fig. 14 shows the magnitude of RMS spot diameter of the imaging lens of example 7 at different angles of view in the first quadrant. As can be seen from fig. 14, embodiment 7 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 8
An imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 and 16.
Fig. 15 shows a schematic structural diagram of an imaging lens according to embodiment 8 of the present application.
As shown in fig. 15, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. The eighth lens element E8 has positive refractive power, and its object-side surface S15 is convex and its image-side surface S16 is concave. The filter E8 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 36 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 8, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 36
As can be seen from table 36, in example 8, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, the fourth lens element E4, the sixth lens element E6, the seventh lens element E7 and the eighth lens element E8, and the image side surface S2 of the first lens element E1 and the image side surface S10 of the fifth lens element E5 are aspheric; the object side surface S1 of the first lens element E1 and the object side surface S9 of the fifth lens element E5 are aspheric with respect to non-rotational symmetry.
Table 37 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 38 and 39 show rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S1 and S9 in embodiment 8, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
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Table 37
Table 38
AAS surface FR FP GR GP HR HP JR JP
S1 -1.1563E-04 1.7734E-03 3.2727E-05 6.9880E-04 -2.8806E-06 -3.8685E-03 -3.3483E-08 2.0835E-02
S9 -4.0886E-03 3.6143E-02 9.9404E-04 4.9923E-02 1.1808E-06 -1.0177E+00 -6.1452E-07 -9.3540E-01
Table 39
Table 40 shows the effective focal lengths f1 to f8 of the respective lenses in embodiment 8, the effective focal length fx in the X-axis direction of the imaging lens, the effective focal length fy in the Y-axis direction of the imaging lens, the total optical length TTL of the imaging lens, and the maximum half field angle Semi-FOV.
f1(mm) 5.25 f7(mm) -4.97
f2(mm) -595.50 f8(mm) 57.05
f3(mm) 6.09 fx(mm) 6.25
f4(mm) -3.13 fy(mm) 7.00
f5(mm) 130.44 TTL(mm) 7.10
f6(mm) 7.76 Semi-FOV(°) 18.8
Table 40
Fig. 16 shows the magnitude of RMS spot diameters of the imaging lens of example 8 at different angles of view in the first quadrant. As can be seen from fig. 16, embodiment 8 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 9
An imaging lens according to embodiment 9 of the present application is described below with reference to fig. 17 and 18. Fig. 17 shows a schematic configuration diagram of an imaging lens according to embodiment 9 of the present application.
As shown in fig. 17, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has 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 negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is concave, 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 E8 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 41 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 9, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 41
As can be seen from table 41, in example 9, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6 and the eighth lens element E8, and the object side surface S3 of the second lens element E2 and the object side surface S13 of the seventh lens element E7 are aspherical surfaces; the image side surface S4 of the second lens element E2 and the image side surface S14 of the seventh lens element E7 are aspheric with respect to non-rotational symmetry.
Table 42 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 9, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 43 and 44 show rotationally symmetric components and higher-order coefficients of rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S4 and S14 in embodiment 9, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -7.8022E-02 -2.0351E-03 2.8750E-03 1.3787E-03 4.7248E-04 3.3308E-05 -2.0716E-05 -2.9458E-05 0.0000E+00
S2 -1.1195E-02 8.5014E-03 1.2169E-03 -1.1973E-04 8.8685E-04 -4.8393E-04 -9.8544E-06 2.0112E-05 0.0000E+00
S3 8.8291E-03 5.3422E-04 1.5465E-03 -1.7637E-03 8.6136E-04 -2.8239E-04 -8.9051E-05 2.1282E-05 0.0000E+00
S5 -1.6419E-02 -1.7403E-03 2.2091E-04 -3.7831E-04 2.0902E-04 -8.2914E-05 4.4434E-05 -1.9559E-05 0.0000E+00
S6 -2.6302E-02 -5.2419E-03 1.3440E-03 -5.2582E-04 1.2609E-04 -5.9834E-05 3.5865E-05 -1.4172E-05 0.0000E+00
S7 -4.8002E-03 6.4886E-04 1.2260E-03 -5.8582E-04 1.4158E-04 -4.6281E-05 1.9124E-05 -9.8712E-06 0.0000E+00
S8 4.3268E-03 3.3792E-03 5.4380E-04 -2.9351E-04 5.5686E-05 -9.3651E-06 4.7621E-08 1.2120E-07 0.0000E+00
S9 -1.4839E-02 -9.1487E-04 5.5623E-04 5.2159E-05 1.8853E-04 5.2128E-05 1.6027E-05 -6.3195E-06 0.0000E+00
S10 -1.3913E-01 -5.5525E-03 1.4863E-03 6.9982E-04 4.5215E-04 1.9797E-04 5.9591E-05 2.5049E-05 0.0000E+00
S11 -2.6839E-01 1.2164E-02 1.1816E-02 2.9371E-03 7.8826E-04 2.9239E-05 -8.8333E-05 -1.5242E-05 0.0000E+00
S12 -1.5599E-01 2.9870E-02 5.9734E-03 1.8932E-04 4.4454E-04 -2.9823E-04 -2.6629E-04 -1.8310E-05 0.0000E+00
S13 -7.3082E-02 8.4661E-03 1.4497E-02 -6.2670E-04 8.0201E-03 3.6545E-05 -1.3708E-04 -7.3123E-04 0.0000E+00
S15 -6.1144E-01 2.0059E-01 -2.2387E-02 4.2903E-03 -1.3952E-03 1.8253E-03 -1.7415E-03 4.0685E-04 0.0000E+00
S16 -7.5675E-01 1.4447E-01 -5.2706E-02 1.7528E-02 -1.4125E-02 3.2923E-03 -2.0187E-03 6.1465E-04 0.0000E+00
Table 42
Table 43
AAS surface FR FP GR GP HR HP JR JP
S4 -4.6223E-03 -2.2008E-04 1.1016E-03 -5.9182E-04 -1.1452E-04 -6.8099E-05 -3.0170E-09 -7.1053E-01
S14 -1.2698E-02 3.0368E-05 1.8565E-03 -1.1173E-04 -1.1131E-04 -5.1786E-05 -9.8800E-09 -1.6918E-02
Table 44
Table 45 shows effective focal lengths f1 to f8 of the respective lenses in embodiment 9, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, an optical total length TTL of the imaging lens, and a maximum half field angle Semi-FOV.
f1(mm) 5.36 f7(mm) 16.54
f2(mm) 325.53 f8(mm) -3.14
f3(mm) 8.19 fx(mm) 6.65
f4(mm) -3.63 fy(mm) 7.52
f5(mm) 7.75 TTL(mm) 7.10
f6(mm) 231.18 Semi-FOV(°) 18.4
Table 45
Fig. 18 shows the magnitude of RMS spot diameters of the imaging lens of example 9 at different angles of view in the first quadrant. As can be seen from fig. 18, embodiment 9 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 10
An imaging lens according to embodiment 10 of the present application is described below with reference to fig. 19 and 20. Fig. 19 shows a schematic structural diagram of an imaging lens according to embodiment 10 of the present application.
As shown in fig. 19, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 46 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 10, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Watch 46
As can be seen from table 46, in example 10, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the fourth lens element E4, the fifth lens element E5, the seventh lens element E7 and the eighth lens element E8, and the image side surface S6 of the third lens element E3 and the object side surface S11 of the sixth lens element E6 are aspheric; the object side surface S5 of the third lens element E3 and the image side surface S12 of the sixth lens element E6 are aspheric with respect to rotation.
Table 47 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 10, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 48 and 49 show rotationally symmetric components and higher-order coefficients of rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S5 and S12 in embodiment 10, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.1584E-01 1.0559E-02 4.7510E-03 8.5778E-04 -3.0774E-04 -7.1501E-04 -5.3583E-04 -2.0905E-04 0.0000E+00
S2 4.7395E-03 2.2958E-02 -2.9047E-03 1.5137E-03 7.7433E-05 2.2623E-04 -2.4944E-04 7.6240E-05 0.0000E+00
S3 1.1785E-02 2.1547E-04 4.8136E-04 -2.0440E-03 2.7018E-04 6.4931E-04 2.8276E-04 2.5779E-04 0.0000E+00
S4 -6.4278E-04 3.9129E-03 3.8887E-03 -8.9450E-04 1.8498E-04 2.1337E-04 2.8267E-04 1.1888E-04 0.0000E+00
S6 -3.7753E-02 -3.2372E-03 6.4924E-04 -3.0323E-04 9.9810E-05 4.9423E-05 -1.1393E-05 2.3084E-06 0.0000E+00
S7 -7.0817E-03 1.2169E-05 5.0137E-04 -6.3686E-04 9.0351E-05 -3.5007E-05 -2.6428E-05 -8.5051E-06 0.0000E+00
S8 1.3616E-02 3.4220E-03 1.0173E-04 -3.2910E-04 8.7313E-05 2.4131E-05 4.8948E-06 1.4133E-05 0.0000E+00
S9 -2.3914E-02 -1.9078E-03 1.3209E-03 2.6842E-04 2.9561E-04 8.2292E-05 3.1214E-05 -5.9829E-06 0.0000E+00
S10 -1.4013E-01 -3.9291E-03 3.3640E-03 1.1627E-03 7.0918E-04 3.3464E-04 1.2931E-04 3.5502E-05 0.0000E+00
S11 -2.0922E-01 6.7482E-03 9.8121E-03 1.2679E-03 -1.9688E-04 -3.4792E-04 -7.3454E-05 -1.9394E-05 0.0000E+00
S13 -2.8555E-01 3.8192E-02 2.5744E-02 -3.6226E-03 4.7794E-03 -2.2273E-03 -9.0191E-04 -5.1743E-04 0.0000E+00
S14 -5.0940E-01 2.1502E-02 2.3092E-02 -8.3873E-03 4.1122E-03 -1.7943E-04 2.8928E-04 -1.2699E-04 0.0000E+00
S15 -7.4788E-01 1.2544E-01 -1.1626E-02 4.8380E-03 1.9707E-03 2.2185E-03 -2.0241E-03 -6.5270E-04 0.0000E+00
S16 -1.3245E+00 3.3686E-02 -8.2303E-02 -1.0951E-03 -1.0965E-02 -3.6276E-04 -1.2319E-02 -3.4561E-03 0.0000E+00
Table 47
Table 48
AAS surface FR FP GR GP HR HP JR JP
S5 -1.7700E-02 -3.6859E-04 4.7372E-03 4.5919E-04 -5.3286E-04 1.7871E-03 -3.7869E-06 4.1690E-02
S12 -2.1204E-03 8.2071E-04 5.6700E-04 1.0108E-03 -6.8430E-05 -1.8150E-03 1.6864E-11 -3.2143E+00
Table 49
Table 50 shows effective focal lengths f1 to f8 of the respective lenses in embodiment 10, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, an optical total length TTL of the imaging lens, and a maximum half field angle Semi-FOV.
f1(mm) 5.31 f7(mm) -8.56
f2(mm) -5118.55 f8(mm) -20.13
f3(mm) 9.56 fx(mm) 7.61
f4(mm) -3.90 fy(mm) 7.00
f5(mm) 6.80 TTL(mm) 7.10
f6(mm) -31.05 Semi-FOV(°) 19.2
Table 50
Fig. 20 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 10 at different angles of view in the first quadrant. As can be seen from fig. 20, embodiment 10 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
Example 11
An imaging lens according to embodiment 11 of the present application is described below with reference to fig. 21 and 22. Fig. 21 shows a schematic configuration diagram of an imaging lens according to embodiment 11 of the present application.
As shown in fig. 21, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19. In the optical lens of the present embodiment, a stop STO may be disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is concave and an image-side surface S14 thereof is convex. The eighth lens element E8 has negative refractive power, wherein an object-side surface S15 thereof is convex and an image-side surface S16 thereof is concave. The filter E8 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 51 shows the surface types, the radius of curvature X, the radius of curvature Y, the thickness, the refractive index, the dispersion coefficient, the cone coefficient X, and the cone coefficient Y of each lens of the imaging lens of embodiment 11, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 51
As can be seen from table 51, in example 11, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, the sixth lens element E6, the seventh lens element E7 and the eighth lens element E8, and the image side surface S2 of the first lens element E1, the image side surface S8 of the fourth lens element E4 and the image side surface S10 of the fifth lens element are aspheric; the object side surface S1 of the first lens element, the object side surface S7 of the fourth lens element E4 and the object side surface S9 of the fifth lens element E5 are aspheric with non-rotational symmetry.
Table 52 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 11, where each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Tables 53 and 54 show rotationally symmetric components and higher-order coefficients of the rotationally asymmetric components that can be used for the rotationally asymmetric aspherical surfaces S1, S7, and S9 in embodiment 11, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S2 -1.6502E-02 1.2157E-02 1.0291E-03 2.3563E-05 2.6845E-04 -2.1629E-04 2.9831E-05 -2.8151E-06 0.0000E+00
S3 8.9841E-03 1.4047E-03 2.7169E-03 -1.7961E-03 7.3788E-04 -3.0506E-04 1.0577E-04 -2.6432E-05 0.0000E+00
S4 -3.7148E-03 -1.0081E-04 3.7889E-03 -1.3618E-03 6.9964E-04 -6.3215E-05 -4.2471E-05 -1.6510E-05 0.0000E+00
S5 -1.6567E-02 -5.1061E-04 3.7126E-04 3.6493E-04 -1.0535E-04 1.6313E-04 -4.8661E-05 -4.0554E-05 0.0000E+00
S6 -3.0128E-02 -4.8184E-03 7.9419E-04 2.3576E-04 -1.6500E-04 6.9779E-05 -1.7081E-05 -4.5585E-06 0.0000E+00
S8 5.8228E-03 2.8119E-03 3.2965E-04 -2.3119E-05 8.0257E-05 3.9007E-05 3.0394E-05 2.0742E-05 0.0000E+00
S10 -1.2693E-01 -3.5912E-03 4.0075E-04 1.2304E-04 9.7516E-05 4.5982E-05 1.1912E-05 1.3166E-05 0.0000E+00
S11 -2.1890E-01 -1.6422E-03 6.6516E-03 1.1488E-03 2.2788E-04 6.0608E-05 1.2441E-05 1.0182E-06 0.0000E+00
S12 -1.2542E-01 2.6105E-02 7.8305E-03 -9.0744E-05 2.1853E-05 2.3041E-04 -1.1264E-04 4.1836E-06 0.0000E+00
S13 -2.1280E-01 3.1735E-02 1.4239E-02 -6.5385E-03 4.7502E-03 8.3275E-04 4.2881E-04 -1.8833E-04 0.0000E+00
S14 -4.9368E-01 -5.9887E-03 1.9294E-02 -1.4330E-02 7.8930E-03 -2.8332E-04 1.1096E-03 -3.2868E-04 0.0000E+00
S15 -4.5045E-01 1.7408E-01 -4.4547E-02 1.5257E-04 1.6478E-03 1.6077E-03 -1.4828E-03 3.1222E-04 0.0000E+00
S16 -5.8512E-01 1.8698E-01 -5.1377E-02 5.3708E-03 -5.0926E-03 2.0922E-03 -2.9499E-04 -2.9116E-05 0.0000E+00
Watch 52
Table 53
AAS surface FR FP GR GP HR HP JR JP
S1 -3.4502E-04 0.0000E+00 9.1601E-05 0.0000E+00 -9.1061E-06 0.0000E+00 0.0000E+00 0.0000E+00
S7 -3.0384E-02 0.0000E+00 1.0928E-02 0.0000E+00 -1.7864E-03 0.0000E+00 0.0000E+00 0.0000E+00
S9 -2.8344E-03 0.0000E+00 4.4136E-04 0.0000E+00 9.1509E-05 0.0000E+00 0.0000E+00 0.0000E+00
Watch 54
Table 55 shows effective focal lengths f1 to f8 of the respective lenses in embodiment 11, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, an optical total length TTL of the imaging lens, and a maximum half field angle Semi-FOV.
f1(mm) 4.96 f7(mm) -6.63
f2(mm) -144.03 f8(mm) -5.51
f3(mm) 8.94 fx(mm) 7.45
f4(mm) -3.66 fy(mm) 6.95
f5(mm) 7.98 TTL(mm) 7.09
f6(mm) 60.24 Semi-FOV(°) 18.0
Table 55
Fig. 22 shows the magnitude of RMS spot diameter of the imaging lens of example 11 at different angles of view in the first quadrant. As can be seen from fig. 22, embodiment 11 provides a high-pixel and long-focus eight-lens imaging lens, which can better meet the use requirements of various special scenes.
In summary, examples 1 to 11 each satisfy the relationship shown in table 56.
Watch 56
The application also provides an image pickup device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a cellular phone. The image pickup apparatus is equipped with the imaging lens described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (9)

1. The imaging lens sequentially comprises the following components 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,
It is characterized in that the method comprises the steps of,
The first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has positive focal power or negative focal power, and the image side surface of the second lens is a concave surface;
the third lens has positive focal power, and the object side surface of the third lens is a convex surface;
the fourth lens has negative focal power, and the image side surface of the fourth lens is a concave surface;
The fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface;
The image side surface of the sixth lens is a convex surface;
the object side surface of the seventh lens is a concave surface;
the image side surface of the eighth lens is a concave surface;
In response to the second lens having positive optical power, the sixth lens having positive optical power and the eighth lens having negative optical power;
In response to the second lens having negative optical power, the seventh lens having negative optical power, and the sixth and eighth lenses having positive and negative optical powers, respectively, or having negative and negative optical powers, respectively, or having positive and positive optical powers, respectively;
At least one of the first to eighth lenses has an aspherical surface that is non-rotationally symmetrical;
The distance TTL from the center of the object side surface of the first lens to the imaging surface of the imaging lens on the optical axis, the effective focal length fx in the X-axis direction of the imaging lens and the effective focal length fy in the Y-axis direction of the imaging lens meet the condition that TTL/(fx+fy) X2 <1.1;
an effective focal length f3 of the third lens, an effective focal length f1 of the first lens, and an effective focal length f5 of the fifth lens satisfy 0< f 3/(f1+f5) <0.8;
the radius of curvature R5 of the third lens object-side surface and the radius of curvature R1 of the first lens object-side surface satisfy 1< R5/R1<1.8;
The curvature radius R12 of the image side surface of the sixth lens, the curvature radius R13 of the object side surface of the seventh lens, the curvature radius R16 of the image side surface of the eighth lens and the curvature radius R10 of the image side surface of the fifth lens satisfy the ratio of R12+ R13-R16)/R10 being more than or equal to 0.3 and less than or equal to 1.3; and
The number of lenses having optical power in the imaging lens is eight.
2. The imaging lens as claimed in claim 1, wherein an effective focal length fx in an X-axis direction of the imaging lens and an effective focal length fy in a Y-axis direction of the imaging lens satisfy 0.8 < fx/fy < 1.2.
3. The imaging lens as claimed in claim 1, wherein an effective focal length fy of a half of a diagonal length ImgH of an effective pixel region on the imaging surface and a Y-axis direction of the imaging lens satisfies 0.32 ∈imgh/fy <0.5.
4. The imaging lens as claimed in claim 1, wherein an effective focal length f4 of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy-2.3 < f4/R8< -1.3.
5. The imaging lens of claim 1, wherein a center thickness CT1 of the first lens, a center thickness CT2 of the second lens, a center thickness CT3 of the third lens, and a center thickness CT4 of the fourth lens satisfy 0.5< ct1/(CT 2+ CT3+ CT 4) <1.2.
6. The imaging lens according to claim 1, wherein an air interval T45 between the fourth lens and the fifth lens, an air interval T56 between the fifth lens and the sixth lens, and an air interval T67 between the sixth lens and the seventh lens satisfy 0.3< T45/(t56+t67) <1.0.
7. The imaging lens as claimed in claim 1, wherein a distance SL of a diaphragm to the imaging surface on the optical axis and a distance TTL of a center of an object side surface of the first lens to the imaging surface on the optical axis satisfy 0.6< SL/TTL <0.8.
8. The imaging lens as claimed in claim 1, wherein an effective half-aperture DT21 of the second lens object side surface, an effective half-aperture DT22 of the second lens image side surface, and a half of a diagonal length ImgH of an effective pixel region on the imaging surface satisfy 1.0< (dt21+dt22)/ImgH <1.5.
9. The imaging lens of claim 1, wherein an edge thickness ET5 of the fifth lens, an edge thickness ET6 of the sixth lens, a center thickness CT5 of the fifth lens, and a center thickness CT6 of the sixth lens satisfy 0.5< (ET 5+ ET 6)/(CT 5+ CT 6) <1.0.
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