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CN108594407B - Image pickup lens - Google Patents

Image pickup lens Download PDF

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Publication number
CN108594407B
CN108594407B CN201810667822.3A CN201810667822A CN108594407B CN 108594407 B CN108594407 B CN 108594407B CN 201810667822 A CN201810667822 A CN 201810667822A CN 108594407 B CN108594407 B CN 108594407B
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lens
imaging
satisfy
image side
optical axis
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CN108594407A (en
Inventor
周鑫
杨健
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN201810667822.3A priority Critical patent/CN108594407B/en
Priority to CN202111373324.6A priority patent/CN113917667B/en
Publication of CN108594407A publication Critical patent/CN108594407A/en
Priority to PCT/CN2019/077463 priority patent/WO2020001066A1/en
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Publication of CN108594407B publication Critical patent/CN108594407B/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses

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

Abstract

The application discloses camera lens, this camera lens includes along the optical axis from object side to image side in proper order: 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 first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has optical power, and the image side surface of the second lens is a convex surface; the third lens has optical power; the fourth lens has optical power; the fifth lens has optical power; the sixth lens has optical power; the seventh lens has optical power; and the eighth lens has optical power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface. The distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens meet the condition that TTL/ImgH is smaller than 1.65.

Description

Image pickup lens
Technical Field
The present application relates to an imaging lens, and more particularly, to an imaging lens including eight lenses.
Background
With the rapid development of portable electronic products such as smartphones, the market has increasingly high requirements on shooting effects carried by the phones. The conventional photosensitive elements of optical systems, such as image sensors including Charge Coupled Devices (CCDs) and Complementary Metal Oxide Semiconductors (CMOS), are also developing toward large image planes and high pixels.
At present, the conventional optical system cannot meet the requirements of high pixelation, large aperture, small size and the like. In order to ensure that the handheld camera can obtain a shooting effect of small depth of field and virtual-real combination, and can realize clear shooting under dark and weak light rays, an optical system configured on a portable electronic product is required to have the characteristics of large aperture, good imaging quality and high resolution.
Disclosure of Invention
The present application provides an imaging lens that at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an imaging lens, which may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens can meet the condition that TTL/ImgH is smaller than 1.65.
In one embodiment, the total effective focal length f of the camera lens and the entrance pupil diameter EPD of the camera lens may satisfy f/EPD < 1.9.
In one embodiment, the total effective focal length f of the imaging lens and the effective focal length f1 of the first lens may satisfy f/f1 < 0.7.
In one embodiment, the second lens may have positive optical power, and the effective focal length f1 of the first lens and the effective focal length f2 of the second lens may satisfy 1 < f1/f2 < 1.5.
In one embodiment, the third lens may have positive optical power, and the radius of curvature R6 of the image side of the third lens and the effective focal length f3 of the third lens may satisfy-0.6 < R6/f3 < 0.
In one embodiment, the radius of curvature R15 of the object-side surface of the eighth lens and the radius of curvature R16 of the image-side surface of the eighth lens may satisfy 1 < R15/R16 < 1.5.
In one embodiment, the effective radius DT11 of the object side of the first lens and the effective radius DT82 of the image side of the eighth lens may satisfy 0.3 < DT11/DT82 < 0.8.
In one embodiment, the effective radius DT11 of the object side of the first lens and the effective radius DT52 of the image side of the fifth lens may satisfy 0.9 < DT11/DT52 < 1.3.
In one embodiment, the on-axis distance SAG42 between the intersection of the image side surface of the fourth lens element and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens element and the center thickness CT4 of the fourth lens element on the optical axis may satisfy 0.7 < SAG42/CT4 < 1.3.
In one embodiment, the object-side surface of the sixth lens element may be convex and the image-side surface may be concave.
In one embodiment, the on-axis distance SAG62 between the intersection of the image side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image side surface of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis may satisfy-0.5 < SAG62/CT6 < 0.
In one embodiment, the vertical distance YC62 from the critical point of the image side surface of the sixth lens to the optical axis and the effective radius DT62 of the image side surface of the sixth lens may satisfy 0.4 < YC62/DT62 < 0.9.
In one embodiment, the separation distance T34 of the third lens and the fourth lens on the optical axis and the separation distance T45 of the fourth lens and the fifth lens on the optical axis may satisfy 0 < t34×10/T45 < 0.5.
In one embodiment, the central thickness CT5 of the fifth lens element, the central thickness CT6 of the sixth lens element, the central thickness CT7 of the seventh lens element and the central thickness CT8 of the eighth lens element satisfy the ratio of (CT 5+ CT 6)/(CT 7+ CT 8) < 1.
In one embodiment, the sum Σet of the edge thicknesses of the first lens element to the eighth lens element in the direction parallel to the optical axis and the sum Σct of the center thicknesses of the first lens element to the eighth lens element in the optical axis satisfy 0.6 < Σet/Σct.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens may satisfy 0 < | (r11—r12)/(r11+r12) | < 0.3.
In one embodiment, the radius of curvature R11 of the object-side surface of the sixth lens element and the radius of curvature R14 of the image-side surface of the seventh lens element may satisfy 0.7 < R11/R14 < 1.2.
On the other hand, the present application further provides an imaging lens, which may sequentially include, 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens may have positive optical power, and an image side surface thereof may be convex; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The effective focal length f1 of the first lens and the effective focal length f2 of the second lens can satisfy 1 < f1/f2 < 1.5.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens can meet the condition that TTL/ImgH is smaller than 1.65.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The third lens can have positive focal power, and the curvature radius R6 of the image side surface of the third lens and the effective focal length f3 of the third lens can satisfy-0.6 < R6/f3 < 0.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The curvature radius R15 of the object side surface of the eighth lens element and the curvature radius R16 of the image side surface of the eighth lens element may satisfy 1 < R15/R16 < 1.5.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The effective radius DT11 of the object side of the first lens and the effective radius DT52 of the image side of the fifth lens may satisfy 0.9 < DT11/DT52 < 1.3.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The on-axis distance SAG42 between the intersection point of the image side surface of the fourth lens element and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens element and the center thickness CT4 of the fourth lens element on the optical axis can satisfy 0.7 < SAG42/CT4 < 1.3.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The on-axis distance SAG62 between the intersection point of the image side surface of the sixth lens and the optical axis and the vertex of the effective radius of the image side surface of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis can satisfy-0.5 < SAG62/CT6 < 0.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The vertical distance YC62 from the critical point of the image-side surface of the sixth lens element to the optical axis and the effective radius DT62 of the image-side surface of the sixth lens element may satisfy 0.4 < YC62/DT62 < 0.9.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The distance T34 between the third lens and the fourth lens and the distance T45 between the fourth lens and the fifth lens on the optical axis can satisfy 0 < T34 multiplied by 10/T45 < 0.5.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The sum of edge thicknesses sigma ET of the first lens to the eighth lens in the direction parallel to the optical axis and the sum of center thicknesses sigma CT of the first lens to the eighth lens in the optical axis can satisfy 0.6 < [ sigma ] ET/[ sigma ] CT less than or equal to 1.
In still another aspect, the present application further provides an imaging lens, where the imaging lens may include, in order 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. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface. The radius of curvature R11 of the object-side surface of the sixth lens element and the radius of curvature R14 of the image-side surface of the seventh lens element may satisfy 0.7 < R11/R14 < 1.2.
The eight lenses are adopted, and the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens are reasonably distributed, so that the imaging lens has at least one beneficial effect of large aperture, high imaging quality, miniaturization, good processability and the like.
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. 2A to 2E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 1;
fig. 3 shows a schematic configuration diagram of an imaging lens according to embodiment 2 of the present application;
fig. 4A to 4E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 2;
fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;
fig. 6A to 6E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 3;
Fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application;
fig. 8A to 8E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 4;
fig. 9 shows a schematic configuration diagram of an imaging lens according to embodiment 5 of the present application;
fig. 10A to 10E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 5;
fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application;
fig. 12A to 12E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 6;
fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application;
fig. 14A to 14E show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, a magnification chromatic aberration curve, and a relative illuminance curve, respectively, of the imaging lens of embodiment 7.
Fig. 15 schematically shows a critical point L of the sixth lens image side surface and a perpendicular distance YC62 from the critical point L to the optical axis.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. In each lens, the surface closer to the object side is referred to as the object side of the lens; in each lens, the surface closer to the image side is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The imaging lens according to the exemplary embodiment of the present application may include, for example, eight lenses having optical power, that is, 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, and its object-side surface may be convex; the second lens has positive focal power or negative focal power, and the image side surface of the second lens can be a convex surface; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens element with positive or negative refractive power may have a convex object-side surface and a concave image-side surface.
In an exemplary embodiment, the second lens may have positive optical power, and its object-side surface may be convex.
In an exemplary embodiment, the object-side surface of the fourth lens may be convex, and the image-side surface may be concave.
In an exemplary embodiment, the sixth lens may have positive optical power, the object-side surface thereof may be convex, and the image-side surface thereof may be concave.
In an exemplary embodiment, the object-side surface of the seventh lens may be convex and the image-side surface may be concave.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition that f/EPD < 1.9, where f is the total effective focal length of the imaging lens and EPD is the entrance pupil diameter of the imaging lens. More specifically, f and EPD may further satisfy 1.5 < f/EPD < 1.9, e.g., 1.55.ltoreq.f/EPD.ltoreq.1.83. The f/EPD is smaller than 1.9, so that the optical system has the advantages of a large aperture, the imaging effect of the system in a weak light environment is enhanced, the shooting effect of a virtual frame and a real frame is obtained, and the main body is highlighted; at the same time, aberrations of the fringe field of view can also be reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy a condition that TTL/ImgH is less than 1.65, where TTL is a distance between an object side surface of the first lens and an imaging surface of the imaging lens on an optical axis, and ImgH is a half of a diagonal length of an effective pixel area of an electronic light sensing element of the imaging lens. More specifically, TTL and ImgH can further satisfy 1.4.ltoreq.TTL/ImgH.ltoreq.1.6, e.g., 1.46.ltoreq.TTL/ImgH.ltoreq.1.55. The ratio between TTL and ImgH is reasonably controlled, and the size of the system can be effectively compressed while the large image plane is ensured, so that the compact size characteristic of the lens is met.
In an exemplary embodiment, the imaging lens of the present application may satisfy a conditional expression f/f1 < 0.7, where f is a total effective focal length of the imaging lens, and f1 is an effective focal length of the first lens. More specifically, f and f1 may further satisfy 0.4.ltoreq.ff1.ltoreq.0.6, for example 0.47.ltoreq.f1.ltoreq.0.51. The positive focal power of the first lens is reasonably controlled, and the position of the light can be effectively adjusted; meanwhile, the condition formula f/f1 is smaller than 0.7, and the total length of the imaging lens is also reduced.
In an exemplary embodiment, the second lens of the imaging lens of the present application may have positive optical power, and may satisfy the condition 1 < f1/f2 < 1.5, where f1 is an effective focal length of the first lens and f2 is an effective focal length of the second lens. More specifically, f1 and f2 may further satisfy 1.15.ltoreq.f1/f2.ltoreq.1.34. The ratio of the effective focal length of the first lens to the effective focal length of the second lens is reasonably set, the second lens is guaranteed to have positive focal power under the condition that the focal power of the first lens is positive, the convergence capacity of an optical system to light rays can be improved, the focusing position of the light rays is adjusted, and the total length of the system is shortened.
In an exemplary embodiment, the third lens of the imaging lens of the present application may have positive optical power, and may satisfy the conditional expression-0.6 < R6/f3 < 0, where R6 is a radius of curvature of an image side surface of the third lens, and f3 is an effective focal length of the third lens. More specifically, R6 and f3 may further satisfy-0.55.ltoreq.R6/f3.ltoreq.0.30. Satisfying the condition-0.6 < R6/f3 < 0, the astigmatism of the system can be effectively balanced, and the back focal length of the system can be shortened, thereby further ensuring the miniaturization of the optical system.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 1 < R15/R16 < 1.5, where R15 is a radius of curvature of an object side surface of the eighth lens element, and R16 is a radius of curvature of an image side surface of the eighth lens element. More specifically, R15 and R16 may further satisfy 1.12.ltoreq.R15/R16.ltoreq.1.33. The curvature radius of the object side surface and the curvature radius of the image side surface of the eighth lens are reasonably arranged, so that the optical system can be better matched with the chief ray angle of the chip.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.3 < DT11/DT82 < 0.8, where DT11 is an effective radius of an object side surface of the first lens element, and DT82 is an effective radius of an image side surface of the eighth lens element. More specifically, DT11 and DT82 may further satisfy 0.4. Ltoreq.DT 11/DT 82. Ltoreq.0.7, e.g., 0.52. Ltoreq.DT 11/DT 82. Ltoreq.0.60. The ratio of the effective radius of the object side surface of the first lens to the effective radius of the image side surface of the eighth lens is reasonably controlled, so that the optical system can meet the structural characteristic of small size.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.9 < DT11/DT52 < 1.3, where DT11 is an effective radius of an object side surface of the first lens element, and DT52 is an effective radius of an image side surface of the fifth lens element. More specifically, DT11 and DT52 may further satisfy 0.98. Ltoreq. DT11/DT 52. Ltoreq.1.21. The ratio of the effective radius of the object side surface of the first lens to the effective radius of the image side surface of the fifth lens is reasonably controlled, so that the system assembly is facilitated, and the relative illumination of the lens is ensured.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.7 < SAG42/CT4 < 1.3, where SAG42 is an on-axis distance between an intersection point of the image side surface of the fourth lens and the optical axis and an apex of an effective radius of the image side surface of the fourth lens, and CT4 is a center thickness of the fourth lens on the optical axis. More specifically, SAG42 and CT4 may further satisfy 0.77.ltoreq.SAG 42/CT 4.ltoreq.1.12. The condition that SAG42/CT4 is smaller than 0.7 and smaller than 1.3 is satisfied, the matching degree with the angle of the principal ray of the chip can be adjusted, the degree of freedom of the lens change can be increased, and the capability of correcting astigmatism and field curvature of the system is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition that-0.5 < SAG62/CT6 < 0, where SAG62 is an on-axis distance between an intersection point of the image side surface of the sixth lens and the optical axis and an apex of an effective radius of the image side surface of the sixth lens, and CT6 is a center thickness of the sixth lens on the optical axis. More specifically, SAG62 and CT6 can further satisfy-0.46.ltoreq.SAG 62/CT 6.ltoreq.0.22. The condition that SAG62/CT6 is less than 0 and 0 is satisfied, the angle of the principal ray of the system can be reasonably adjusted, and the matching degree with the angle of the principal ray of the chip can be adjusted; meanwhile, the relative brightness of the system can be effectively improved, and the image surface definition is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.4 < YC62/DT62 < 0.9, where YC62 is a critical point of the image side surface of the sixth lens (the critical point of the image side surface of the sixth lens refers to a point on the image side surface of the sixth lens that is tangential to a tangential plane to the optical axis except for an intersection point with the optical axis, for example, a critical point L schematically shown in fig. 15), and DT62 is an effective radius of the image side surface of the sixth lens. More specifically, YC62 and DT62 may further satisfy 0.6.ltoreq.YC62/DT 62.ltoreq.0.7, for example 0.66.ltoreq.YC62/DT 62.ltoreq.0.68. The ratio of YC62 to DT62 is set reasonably, so that the size of the lens of the optical system can be reduced effectively, and the overlarge volume of the camera lens is avoided, thereby meeting the requirement of a compact system.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < t34×10/t45 < 0.5, where T34 is a distance between the third lens and the fourth lens on the optical axis, and T45 is a distance between the fourth lens and the fifth lens on the optical axis. More specifically, T34 and T45 may further satisfy 0.3.ltoreq.T34.ltoreq.T34.times.10/T45.ltoreq.0.45, for example 0.32.ltoreq.T34.times.10/T45.ltoreq.0.41. The ratio of T34 to T45 is reasonably set, so that the optical system has the characteristics of light weight, thinness and compactness, and can be widely applied to high-performance portable electronic products.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition that (ct5+ct6)/(CT 7+ct8) < 1, where CT5 is the center thickness of the fifth lens element on the optical axis, CT6 is the center thickness of the sixth lens element on the optical axis, CT7 is the center thickness of the seventh lens element on the optical axis, and CT8 is the center thickness of the eighth lens element on the optical axis. More specifically, CT5, CT6, CT7 and CT8 may further satisfy 0.68.ltoreq.Ct5+Ct6)/(Ct7+Ct8). Ltoreq.0.92. The thicknesses of the centers of the fifth lens, the sixth lens, the seventh lens and the eighth lens on the optical axis are reasonably distributed, so that the size of an optical system can be effectively reduced, the overlarge volume of an imaging lens is avoided, meanwhile, the assembly difficulty of the lenses can be reduced, and the higher space utilization rate is realized.
In an exemplary embodiment, the imaging lens of the present application may satisfy a conditional expression of 0.6 < Σet/Σct, which is a sum of thicknesses of edges of the first lens element to the eighth lens element in a direction parallel to the optical axis, respectively, and Σct is a sum of thicknesses of centers of the first lens element to the eighth lens element in the optical axis, respectively. More specifically, sigmaET and SigmaCT can further satisfy 0.78.ltoreq.SigmaET/. SigmaCT.ltoreq.1.00. Satisfies the condition that the E/CT is less than or equal to 1 and less than or equal to 0.6, can lead the balance between the thickness of the edge of each lens and the thickness of the center of the lens to be stable, space utilization rate is improved, and difficulty in lens processing and assembly is reduced; and the aberration correcting capability of the system can be enhanced while the miniaturization of the lens is ensured.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0 < | (R11-R12)/(r11+r12) | < 0.3, where R11 is the radius of curvature of the object side surface of the sixth lens element and R12 is the radius of curvature of the image side surface of the sixth lens element. More specifically, R11 and R12 may further satisfy 0 < | (R11-R12)/(R11+R12) | < 0.15, for example, 0.03.ltoreq.| (R11-R12)/(R11+R12) |.ltoreq.0.12. The radius of curvature of the object side surface and the image side surface of the sixth lens are reasonably distributed, so that the focal power of the two sides of the sixth lens of the optical system can be adjusted, and the optical system has stronger astigmatism balancing capability.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.7 < R11/R14 < 1.2, where R11 is a radius of curvature of an object side surface of the sixth lens element, and R14 is a radius of curvature of an image side surface of the seventh lens element. More specifically, R11 and R14 may further satisfy 0.85.ltoreq.R11/R14.ltoreq.1.03. And the curvature radius of the object side surface of the sixth lens and the curvature radius of the image side surface of the seventh lens are reasonably distributed, so that the consistency of the concave-convex conditions of the object side surface of the sixth lens and the image side surface of the seventh lens is ensured, and the distortion of the system can be effectively balanced.
In an exemplary embodiment, the image capturing lens may further include at least one diaphragm to improve the imaging quality of the lens. Optionally, a stop may be provided between the third lens and the fourth lens.
Optionally, the above-mentioned image pickup 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 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 processability of the lens can be improved, so that the camera lens is more beneficial to production and processing and can be suitable for portable electronic products such as smart phones and the like. Meanwhile, the imaging lens with the configuration has the beneficial effects of large aperture, high imaging quality, miniaturization, good processability and the like.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.
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 the present specification without departing from the technical solutions claimed herein. For example, although eight lenses are described as an example in the embodiment, the imaging lens is not limited to include eight lenses. The camera 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 drawings.
Example 1
An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 1 to 2E. 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 L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the filter L9, and the imaging surface S19.
The first lens element L1 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 L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a 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 L5 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 L6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element L8 has negative refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is concave. The filter L9 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 1, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001708208020000151
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 L1 to the eighth lens L8 are aspherical surfaces. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Figure BDA0001708208020000152
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. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S16 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.8443E-02 1.3417E-01 -5.8304E-01 1.0874E+00 -1.2225E+00 8.4746E-01 -3.5262E-01 8.0849E-02 -7.8658E-03
S2 -1.5704E-02 -5.7637E-02 -1.8760E-01 6.4095E-01 -8.7566E-01 6.9431E-01 -3.3020E-01 8.7239E-02 -9.8362E-03
S3 -3.0419E-02 7.5150E-02 -6.4272E-01 1.6500E+00 -2.1961E+00 1.7637E+00 -8.6092E-01 2.3462E-01 -2.7307E-02
S4 1.3419E-02 -1.8463E-02 -9.7519E-02 4.0147E-01 -7.0012E-01 6.9304E-01 -4.0160E-01 1.2670E-01 -1.6763E-02
S5 -1.2228E-02 5.4042E-02 -3.9273E-02 -1.7391E-01 4.5225E-01 -4.9556E-01 2.9413E-01 -9.2506E-02 1.2101E-02
S6 -1.3278E-01 7.6758E-01 -2.5392E+00 4.8470E+00 -5.7566E+00 4.3228E+00 -1.9941E+00 5.1512E-01 -5.6993E-02
S7 -1.7843E-01 9.2051E-01 -3.4534E+00 7.7551E+00 -1.0932E+01 9.8377E+00 -5.4943E+00 1.7368E+00 -2.3759E-01
S8 -7.4856E-02 1.0810E-01 -3.1892E-01 7.0729E-01 -1.0700E+00 1.1723E+00 -8.8089E-01 3.9201E-01 -7.5483E-02
S9 -3.7457E-02 2.2812E-01 -9.8023E-01 2.1942E+00 -3.0007E+00 2.5726E+00 -1.3561E+00 4.0340E-01 -5.1936E-02
S10 -5.0299E-02 1.5177E-01 -5.7617E-01 1.0471E+00 -1.1470E+00 7.9607E-01 -3.4567E-01 8.6322E-02 -9.4456E-03
S11 1.0162E-01 -5.7223E-02 -1.4563E-01 3.1074E-01 -3.1646E-01 1.8983E-01 -6.8196E-02 1.3524E-02 -1.1293E-03
S12 -5.8966E-02 1.1933E-01 -1.7065E-01 1.3793E-01 -7.3067E-02 2.5216E-02 -5.3962E-03 6.4720E-04 -3.3153E-05
S13 -1.2443E-02 -1.2753E-01 1.8007E-01 -1.6753E-01 9.2634E-02 -3.0370E-02 5.8802E-03 -6.2534E-04 2.8247E-05
S14 -1.5540E-01 8.8377E-02 -4.5964E-02 1.0973E-02 1.6228E-04 -6.7227E-04 1.4945E-04 -1.4105E-05 5.0508E-07
S15 -4.8396E-01 2.7635E-01 -9.6443E-02 2.1298E-02 -2.9820E-03 2.6396E-04 -1.5182E-05 6.1435E-07 -1.5454E-08
S16 -3.3601E-01 2.1775E-01 -1.0397E-01 3.5616E-02 -8.3294E-03 1.2683E-03 -1.1892E-04 6.2027E-06 -1.3742E-07
TABLE 2
Table 3 gives the total optical length TTL of the imaging lens in embodiment 1 (i.e., the distance on the optical axis from the object side surface S1 to the imaging surface S19 of the first lens L1), half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.
TTL(mm) 5.38 f4(mm) -7.90
ImgH(mm) 3.50 f5(mm) 243.82
f(mm) 4.20 f6(mm) 28.32
f1(mm) 8.42 f7(mm) -14.54
f2(mm) 6.41 f8(mm) -60.86
f3(mm) 27.13
TABLE 3 Table 3
The imaging lens in embodiment 1 satisfies the following relationship:
f/epd=1.55, where f is the total effective focal length of the imaging lens, EPD is the entrance pupil diameter of the imaging lens;
TTL/imgh=1.54, where TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S19 of the imaging lens on the optical axis, and ImgH is a half of a diagonal length of an effective pixel area of the electronic light sensing element of the imaging lens;
ff1=0.50, where f is the total effective focal length of the imaging lens, and f1 is the effective focal length of the first lens L1;
f1/f2=1.31, where f1 is the effective focal length of the first lens L1 and f2 is the effective focal length of the second lens L2;
r6/f3= -0.35, where R6 is the radius of curvature of the image side surface S6 of the third lens L3, and f3 is the effective focal length of the third lens L3;
r15/r16=1.18, where R15 is a radius of curvature of the object-side surface S15 of the eighth lens element L8, and R16 is a radius of curvature of the image-side surface S16 of the eighth lens element L8;
DT11/DT82 = 0.60, wherein DT11 is the effective radius of the object-side surface S1 of the first lens element L1, and DT82 is the effective radius of the image-side surface S16 of the eighth lens element L8;
DT11/DT52 = 1.09, wherein DT11 is the effective radius of the object-side surface S1 of the first lens element L1, and DT52 is the effective radius of the image-side surface S10 of the fifth lens element L5;
SAG 42/ct4=1.05, wherein SAG42 is an on-axis distance between an intersection point of the image side surface S8 of the fourth lens element L4 and the optical axis and an effective radius vertex of the image side surface S8 of the fourth lens element L4, and CT4 is a center thickness of the fourth lens element L4 on the optical axis;
SAG 62/ct6= -0.31, wherein SAG62 is an on-axis distance between an intersection point of the image side surface S12 of the sixth lens L6 and the optical axis and an effective radius vertex of the image side surface S12 of the sixth lens L6, and CT6 is a center thickness of the sixth lens L6 on the optical axis;
YC62/DT 62=0.67, where YC62 is the vertical distance from the critical point of the image-side surface S12 of the sixth lens element L6 to the optical axis, and DT62 is the effective radius of the image-side surface S12 of the sixth lens element L6;
t34×10/t45=0.40, where T34 is the distance between the third lens L3 and the fourth lens L4 on the optical axis, and T45 is the distance between the fourth lens L4 and the fifth lens L5 on the optical axis;
(ct5+ct6)/(CT 7+ct8) =0.68, wherein CT5 is the center thickness of the fifth lens L5 on the optical axis, CT6 is the center thickness of the sixth lens L6 on the optical axis, CT7 is the center thickness of the seventh lens L7 on the optical axis, and CT8 is the center thickness of the eighth lens L8 on the optical axis;
Σet/Σct=0.84, wherein Σet is the sum of the edge thicknesses of the first lens L1 to the eighth lens L8, respectively, in the direction parallel to the optical axis, Σct is the sum of the center thicknesses of the first lens L1 to the eighth lens L8, respectively, in the optical axis;
(R11-R12)/(r11+r12) |=0.07, wherein R11 is the radius of curvature of the object-side surface S11 of the sixth lens element L6, and R12 is the radius of curvature of the image-side surface S12 of the sixth lens element L6;
r11/r14=0.93, where R11 is a radius of curvature of the object side surface S11 of the sixth lens L6, and R14 is a radius of curvature of the image side surface S14 of the seventh lens L7.
Fig. 2A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve of the imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2D shows a magnification chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 2E shows a relative illuminance curve of the imaging lens of embodiment 1, which represents relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 2A to 2E, the imaging lens provided in embodiment 1 can achieve good imaging quality.
Example 2
An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 3 to 4E. 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 diagram of an imaging lens according to embodiment 2 of the present application.
As shown in fig. 3, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the filter L9, and the imaging surface S19.
The first lens element L1 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 L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element L5 has a negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element L8 has negative refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is concave. The filter L9 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 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 2, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001708208020000191
TABLE 4 Table 4
As can be seen from table 4, in embodiment 2, the object side surface and the image side surface of any one of the first lens L1 to the eighth lens L8 are aspherical surfaces. Table 5 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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 1.8401E-02 1.9961E-01 -7.8604E-01 1.4566E+00 -1.6361E+00 1.1367E+00 -4.7584E-01 1.1012E-01 -1.0840E-02
S2 -7.3500E-03 -8.7970E-02 -8.7580E-02 3.4661E-01 -3.6316E-01 1.8765E-01 -4.6210E-02 2.7890E-03 5.3300E-04
S3 -9.1230E-02 5.6202E-01 -2.4765E+00 5.5936E+00 -7.3554E+00 5.9529E+00 -2.9261E+00 8.0156E-01 -9.3870E-02
S4 3.5200E-02 -2.6496E-01 8.6460E-01 -1.6134E+00 1.8554E+00 -1.3380E+00 5.8576E-01 -1.4050E-01 1.3879E-02
S5 -2.6500E-02 2.6665E-01 -1.0741E+00 2.5316E+00 -3.7858E+00 3.5940E+00 -2.0839E+00 6.7118E-01 -9.1910E-02
S6 -1.5052E-01 6.8083E-01 -1.6282E+00 1.6754E+00 5.1766E-02 -1.8310E+00 1.8048E+00 -7.5683E-01 1.2189E-01
S7 -2.2572E-01 1.2524E+00 -4.5058E+00 9.8413E+00 -1.3848E+01 1.2727E+01 -7.3925E+00 2.4617E+00 -3.5754E-01
S8 -1.6970E-02 -3.5718E-01 2.0912E+00 -6.5087E+00 1.1874E+01 -1.3115E+01 8.6527E+00 -3.1400E+00 4.8265E-01
S9 -3.1500E-02 1.9952E-01 -9.8735E-01 2.4262E+00 -3.5963E+00 3.3134E+00 -1.8627E+00 5.8675E-01 -7.9520E-02
S10 -3.4800E-02 8.8086E-02 -4.1005E-01 7.5573E-01 -8.0628E-01 5.3662E-01 -2.2091E-01 5.1838E-02 -5.3000E-03
S11 7.7659E-02 2.0260E-02 -2.6749E-01 4.2047E-01 -3.7626E-01 2.0928E-01 -7.1440E-02 1.3637E-02 -1.1000E-03
S12 -7.2510E-02 1.6346E-01 -2.1655E-01 1.5842E-01 -7.4230E-02 2.2556E-02 -4.2900E-03 4.6500E-04 -2.2000E-05
S13 -2.6580E-02 -1.5695E-01 2.4619E-01 -2.3125E-01 1.2786E-01 -4.2140E-02 8.2420E-03 -8.9000E-04 4.0800E-05
S14 -1.2756E-01 2.8757E-02 1.4040E-02 -2.3080E-02 1.1798E-02 -3.1000E-03 4.5300E-04 -3.5000E-05 1.1200E-06
S15 -4.8173E-01 2.7129E-01 -9.0670E-02 1.7687E-02 -1.6800E-03 -1.4000E-05 1.9600E-05 -1.7000E-06 5.1600E-08
S16 -3.8187E-01 2.6673E-01 -1.3583E-01 4.8680E-02 -1.1700E-02 1.8120E-03 -1.7000E-04 9.1000E-06 -2.0000E-07
TABLE 5
Table 6 shows the total optical length TTL of the imaging lens in embodiment 2, half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.
TTL(mm) 5.43 f4(mm) 499.90
ImgH(mm) 3.50 f5(mm) -69.40
f(mm) 4.04 f6(mm) 22.68
f1(mm) 8.67 f7(mm) -14.13
f2(mm) 7.54 f8(mm) -19.53
f3(mm) -44.29
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve of the imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a magnification chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 4E shows a relative illuminance curve of the imaging lens of embodiment 2, which represents relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 4A to 4E, the imaging lens provided in embodiment 2 can achieve good imaging quality.
Example 3
An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 5 to 6E. Fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the filter L9, and the imaging surface S19.
The first lens element L1 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 L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 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 L4 has a 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 L5 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 L6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element L8 has negative refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is concave. The filter L9 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 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 3, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001708208020000211
Figure BDA0001708208020000221
TABLE 7
As is clear from table 7, in example 3, the object side surface and the image side surface of any one of the first lens L1 to the eighth lens L8 are aspherical surfaces. Table 8 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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 2.8572E-02 1.3440E-01 -5.8395E-01 1.0854E+00 -1.2149E+00 8.3872E-01 -3.4772E-01 7.9476E-02 -7.7117E-03
S2 -1.5497E-02 -5.4624E-02 -1.9917E-01 6.6277E-01 -8.9965E-01 7.0995E-01 -3.3604E-01 8.8340E-02 -9.9096E-03
S3 -3.6357E-02 1.1573E-01 -7.7052E-01 1.8760E+00 -2.4382E+00 1.9241E+00 -9.2520E-01 2.4893E-01 -2.8665E-02
S4 1.4198E-02 -2.7460E-02 -5.7126E-02 3.1017E-01 -5.8431E-01 6.0910E-01 -3.6889E-01 1.2120E-01 -1.6671E-02
S5 -1.3018E-02 6.2701E-02 -8.4126E-02 -4.9824E-02 2.4544E-01 -2.8220E-01 1.6088E-01 -4.6278E-02 5.2484E-03
S6 -1.3330E-01 7.8273E-01 -2.6056E+00 4.9928E+00 -5.9516E+00 4.4893E+00 -2.0830E+00 5.4247E-01 -6.0744E-02
S7 -2.0437E-01 1.1916E+00 -4.7650E+00 1.1381E+01 -1.7063E+01 1.6284E+01 -9.6063E+00 3.1944E+00 -4.5796E-01
S8 -6.7900E-02 1.6709E-02 1.7130E-01 -7.8254E-01 1.7149E+00 -2.0971E+00 1.4664E+00 -5.4779E-01 8.4913E-02
S9 -3.7403E-02 2.4340E-01 -1.0917E+00 2.5536E+00 -3.6510E+00 3.2727E+00 -1.7999E+00 5.5628E-01 -7.4005E-02
S10 -4.6485E-02 1.2702E-01 -5.0121E-01 9.2081E-01 -1.0219E+00 7.2206E-01 -3.1985E-01 8.1322E-02 -9.0167E-03
S11 9.8508E-02 -5.0609E-02 -1.4611E-01 3.0050E-01 -3.0329E-01 1.8180E-01 -6.5436E-02 1.3004E-02 -1.0875E-03
S12 -5.7322E-02 1.1014E-01 -1.4946E-01 1.1329E-01 -5.6828E-02 1.8845E-02 -3.9247E-03 4.6275E-04 -2.3486E-05
S13 -1.4005E-02 -1.1884E-01 1.6365E-01 -1.5136E-01 8.3371E-02 -2.7153E-02 5.2102E-03 -5.4822E-04 2.4478E-05
S14 -1.5840E-01 9.7860E-02 -5.7930E-02 1.9380E-02 -3.4224E-03 2.6871E-04 1.6784E-06 -1.4196E-06 4.8679E-08
S15 -4.8143E-01 2.7157E-01 -9.1473E-02 1.8297E-02 -1.9094E-03 3.3810E-05 1.3916E-05 -1.3829E-06 4.1943E-08
S16 -3.2956E-01 2.0834E-01 -9.7506E-02 3.3089E-02 -7.7312E-03 1.1820E-03 -1.1162E-04 5.8775E-06 -1.3171E-07
TABLE 8
Table 9 gives the total optical length TTL of the imaging lens in embodiment 3, half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.
TTL(mm) 5.40 f4(mm) -7.87
ImgH(mm) 3.50 f5(mm) 321.42
f(mm) 4.17 f6(mm) 28.47
f1(mm) 8.42 f7(mm) -14.65
f2(mm) 6.70 f8(mm) -65.91
f3(mm) 22.43
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve of the imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a magnification chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 6E shows a relative illuminance curve of the imaging lens of embodiment 3, which indicates relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 6A to 6E, the imaging lens provided in embodiment 3 can achieve good imaging quality.
Example 4
An imaging lens according to embodiment 4 of the present application is described below with reference to fig. 7 to 8E. Fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the filter L9, and the imaging surface S19.
The first lens element L1 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 L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a 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 L5 has a negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex. The sixth lens element L6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element L7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element L8 has negative refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is concave. The filter L9 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 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 4, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001708208020000241
Table 10
As can be seen from table 10, in example 4, the object side surface and the image side surface of any one of the first lens L1 to the eighth lens L8 are aspherical surfaces. Table 11 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.
Figure BDA0001708208020000242
Figure BDA0001708208020000251
TABLE 11
Table 12 gives the total optical length TTL of the imaging lens in embodiment 4, half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.
TTL(mm) 5.40 f4(mm) -7.79
ImgH(mm) 3.70 f5(mm) -3057.68
f(mm) 4.26 f6(mm) 55.46
f1(mm) 8.46 f7(mm) 1276.36
f2(mm) 6.39 f8(mm) -14.84
f3(mm) 26.36
Table 12
Fig. 8A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 8B shows an astigmatism curve of the imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a magnification chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 8E shows a relative illuminance curve of the imaging lens of embodiment 4, which indicates relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 8A to 8E, the imaging lens provided in embodiment 4 can achieve good imaging quality.
Example 5
An imaging lens according to embodiment 5 of the present application is described below with reference to fig. 9 to 10E. Fig. 9 shows a schematic configuration diagram of an imaging lens according to embodiment 5 of the present application.
As shown in fig. 9, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the filter L9, and the imaging surface S19.
The first lens element L1 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 L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a 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 L5 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 L6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element L8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is concave. The filter L9 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 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 5, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001708208020000261
Figure BDA0001708208020000271
TABLE 13
As is clear from table 13, in example 5, the object side surface and the image side surface of any one of the first lens L1 to the eighth lens L8 are aspherical surfaces. Table 14 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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 3.0132E-02 1.1697E-01 -5.2335E-01 9.7477E-01 -1.0920E+00 7.5272E-01 -3.1070E-01 7.0531E-02 -6.7848E-03
S2 -1.5913E-02 -5.8419E-02 -1.7539E-01 6.0654E-01 -8.2658E-01 6.5145E-01 -3.0681E-01 7.9964E-02 -8.8670E-03
S3 -2.8327E-02 5.4631E-02 -5.4823E-01 1.4216E+00 -1.8739E+00 1.4847E+00 -7.1385E-01 1.9128E-01 -2.1836E-02
S4 1.5931E-02 -3.5842E-02 -3.0188E-02 2.4573E-01 -4.8074E-01 5.0121E-01 -2.9934E-01 9.6190E-02 -1.2856E-02
S5 -1.2950E-02 6.0660E-02 -6.8628E-02 -9.5543E-02 3.2202E-01 -3.6189E-01 2.1186E-01 -6.4668E-02 8.1255E-03
S6 -1.3678E-01 7.8991E-01 -2.5898E+00 4.9009E+00 -5.7651E+00 4.2837E+00 -1.9544E+00 4.9956E-01 -5.4769E-02
S7 -1.6879E-01 7.7881E-01 -2.6168E+00 5.1690E+00 -6.2718E+00 4.7635E+00 -2.2052E+00 5.6820E-01 -6.2300E-02
S8 -7.8321E-02 1.5230E-01 -5.5230E-01 1.3759E+00 -2.2272E+00 2.4108E+00 -1.6797E+00 6.7547E-01 -1.1780E-01
S9 -5.1780E-02 3.9304E-01 -1.7421E+00 4.0539E+00 -5.6713E+00 4.9079E+00 -2.5785E+00 7.5509E-01 -9.4622E-02
S10 -5.4434E-02 1.8177E-01 -6.8864E-01 1.2866E+00 -1.4511E+00 1.0305E+00 -4.5287E-01 1.1296E-01 -1.2203E-02
S11 1.0174E-01 -6.7171E-02 -1.0874E-01 2.4996E-01 -2.6029E-01 1.5875E-01 -5.7882E-02 1.1622E-02 -9.7938E-04
S12 -5.4327E-02 1.0412E-01 -1.4540E-01 1.1366E-01 -5.9030E-02 2.0253E-02 -4.3471E-03 5.2552E-04 -2.7200E-05
S13 -1.3244E-02 -1.1536E-01 1.5714E-01 -1.4543E-01 8.0407E-02 -2.6320E-02 5.0794E-03 -5.3757E-04 2.4127E-05
S14 -1.4977E-01 7.6681E-02 -3.4525E-02 4.3979E-03 2.5729E-03 -1.2410E-03 2.3246E-04 -2.0890E-05 7.4203E-07
S15 -4.7162E-01 2.6447E-01 -8.9760E-02 1.8919E-02 -2.4312E-03 1.7975E-04 -6.8262E-06 1.2170E-07 -2.3616E-09
S16 -3.1516E-01 1.9314E-01 -8.7811E-02 2.9148E-02 -6.7042E-03 1.0114E-03 -9.4208E-05 4.8857E-06 -1.0764E-07
TABLE 14
Table 15 shows the total optical length TTL of the imaging lens in embodiment 5, half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.
Figure BDA0001708208020000272
Figure BDA0001708208020000281
TABLE 15
Fig. 10A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 5, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 10B shows an astigmatism curve of the imaging lens of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the imaging lens of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a magnification chromatic aberration curve of the imaging lens of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 10E shows a relative illuminance curve of the imaging lens of embodiment 5, which indicates relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 10A to 10E, the imaging lens provided in embodiment 5 can achieve good imaging quality.
Example 6
An imaging lens according to embodiment 6 of the present application is described below with reference to fig. 11 to 12E. Fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the filter L9, and the imaging surface S19.
The first lens element L1 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 L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a 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 L5 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 L6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element L8 has negative refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is concave. The filter L9 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 type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 6, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001708208020000291
Table 16
As can be seen from table 16, in example 6, the object side surface and the image side surface of any one of the first lens L1 to the eighth lens L8 are aspherical surfaces. Table 17 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.
Figure BDA0001708208020000292
Figure BDA0001708208020000301
TABLE 17
Table 18 shows the total optical length TTL of the imaging lens in embodiment 6, half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.
TTL(mm) 5.40 f4(mm) -7.94
ImgH(mm) 3.70 f5(mm) 427.81
f(mm) 4.30 f6(mm) 28.03
f1(mm) 8.52 f7(mm) -16.19
f2(mm) 6.36 f8(mm) -31.60
f3(mm) 28.23
TABLE 18
Fig. 12A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve of the imaging lens of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the imaging lens of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a magnification chromatic aberration curve of the imaging lens of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 12E shows a relative illuminance curve of the imaging lens of embodiment 6, which indicates relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 12A to 12E, the imaging lens provided in embodiment 6 can achieve good imaging quality.
Example 7
An imaging lens according to embodiment 7 of the present application is described below with reference to fig. 13 to 14E. Fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, the imaging lens according to the exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens L1, the second lens L2, the third lens L3, the stop STO, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the filter L9, and the imaging surface S19.
The first lens element L1 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 L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a 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 L5 has a negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element L6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element L7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element L8 has negative refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is concave. The filter L9 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 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens of example 7, wherein the units of the radius of curvature and the thickness are millimeters (mm).
Figure BDA0001708208020000311
Figure BDA0001708208020000321
TABLE 19
As is clear from table 19, in example 7, the object side surface and the image side surface of any one of the first lens L1 to the eighth lens L8 are aspherical surfaces. Table 20 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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 4.8972E-02 1.3476E-03 -1.7102E-01 3.3127E-01 -3.5961E-01 2.3254E-01 -8.7177E-02 1.7433E-02 -1.4354E-03
S2 -6.8501E-03 -9.7884E-02 -1.6260E-01 7.6402E-01 -1.1500E+00 9.4557E-01 -4.5022E-01 1.1667E-01 -1.2765E-02
S3 -1.3965E-02 1.5232E-02 -6.6079E-01 2.0937E+00 -3.1358E+00 2.7061E+00 -1.3756E+00 3.8303E-01 -4.5122E-02
S4 4.4401E-02 -2.5900E-01 6.7007E-01 -8.0077E-01 2.2655E-01 4.2843E-01 -4.6358E-01 1.7771E-01 -2.4073E-02
S5 -2.1115E-03 -6.5747E-02 4.0861E-01 -8.5934E-01 7.6475E-01 -1.9960E-01 -1.1120E-01 7.4246E-02 -1.0780E-02
S6 -1.9032E-01 1.2482E+00 -4.4081E+00 9.1514E+00 -1.2045E+01 1.0204E+01 -5.3919E+00 1.6149E+00 -2.0883E-01
S7 -2.1102E-01 1.1912E+00 -4.4339E+00 9.7341E+00 -1.3296E+01 1.1509E+01 -6.1518E+00 1.8582E+00 -2.4357E-01
S8 -6.4582E-02 -8.3919E-02 9.9668E-01 -4.1852E+00 9.6611E+00 -1.3072E+01 1.0349E+01 -4.4425E+00 7.9930E-01
S9 -2.2826E-02 9.8577E-02 -5.0936E-01 1.2007E+00 -1.6849E+00 1.4594E+00 -7.6981E-01 2.2772E-01 -2.8988E-02
S10 -4.7581E-02 8.9371E-02 -3.5280E-01 6.4386E-01 -7.0246E-01 4.8303E-01 -2.0741E-01 5.1338E-02 -5.5833E-03
S11 1.1865E-01 -1.4372E-01 5.0855E-02 5.8343E-02 -1.1771E-01 9.1838E-02 -3.8655E-02 8.5410E-03 -7.6894E-04
S12 -5.7954E-02 9.7736E-02 -1.2094E-01 8.4492E-02 -4.0320E-02 1.3217E-02 -2.8008E-03 3.4176E-04 -1.8081E-05
S13 -1.3696E-02 -1.2510E-01 1.7314E-01 -1.5616E-01 8.4179E-02 -2.7064E-02 5.1593E-03 -5.4144E-04 2.4161E-05
S14 -1.3727E-01 5.6237E-02 -1.5150E-02 -6.6821E-03 6.6187E-03 -2.1911E-03 3.7082E-04 -3.2207E-05 1.1383E-06
S15 -4.6156E-01 2.4562E-01 -7.3786E-02 1.1157E-02 -7.7746E-05 -2.7058E-04 4.5678E-05 -3.2669E-06 9.0148E-08
S16 -3.3574E-01 2.1718E-01 -1.0344E-01 3.5457E-02 -8.3373E-03 1.2820E-03 -1.2190E-04 6.4739E-06 -1.4655E-07
Table 20
Table 21 shows the total optical length TTL of the imaging lens in embodiment 7, half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens, the total effective focal length f of the imaging lens, and the effective focal lengths f1 to f8 of the respective lenses.
TTL(mm) 5.41 f4(mm) -8.09
ImgH(mm) 3.70 f5(mm) -306.28
f(mm) 4.30 f6(mm) 25.69
f1(mm) 8.51 f7(mm) -16.70
f2(mm) 6.38 f8(mm) -34.17
f3(mm) 29.56
Table 21
Fig. 14A shows an on-axis chromatic aberration curve of the imaging lens of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve of the imaging lens of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the imaging lens of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a magnification chromatic aberration curve of the imaging lens of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 14E shows a relative illuminance curve of the imaging lens of embodiment 7, which indicates relative illuminance corresponding to different image heights on the imaging surface. As can be seen from fig. 14A to 14E, the imaging lens provided in embodiment 7 can achieve good imaging quality.
In summary, examples 1 to 7 each satisfy the relationship shown in table 22.
Figure BDA0001708208020000331
Table 22
The present application also provides an image pickup apparatus, in which the electron photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a cellular phone. The imaging device is equipped with the above-described imaging lens.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (31)

1. The imaging lens sequentially comprises, 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, characterized in that,
The first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has optical power, and the image side surface of the second lens is a convex surface;
the third lens has optical power;
the fourth lens has optical power;
the fifth lens has optical power;
the sixth lens has optical power;
the seventh lens has optical power;
the eighth lens is provided with focal power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface; and
the distance TTL between the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis and half of the diagonal length ImgH of the effective pixel area of the electronic light sensing element of the imaging lens meet the condition that TTL/ImgH is less than 1.65;
a separation distance T34 of the third lens and the fourth lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy 0 < T34 multiplied by 10/T45 < 0.5;
at least one mirror surface from the object side surface of the first lens to the image side surface of the eighth lens is an aspheric mirror surface.
2. The imaging lens of claim 1, wherein a total effective focal length f of the imaging lens and an entrance pupil diameter EPD of the imaging lens satisfy f/EPD < 1.9.
3. The imaging lens according to claim 1, wherein a total effective focal length f of the imaging lens and an effective focal length f1 of the first lens satisfy f/f1 < 0.7.
4. The imaging lens as claimed in claim 3, wherein,
the second lens has positive focal power
The effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy 1 < f1/f2 < 1.5.
5. The imaging lens as claimed in claim 1, wherein,
the third lens has positive focal power
The curvature radius R6 of the image side surface of the third lens and the effective focal length f3 of the third lens meet R6/f3 which is less than 0 and less than 0.
6. The imaging lens according to claim 1, wherein a radius of curvature R15 of an object side surface of the eighth lens and a radius of curvature R16 of an image side surface of the eighth lens satisfy 1 < R15/R16 < 1.5.
7. The imaging lens according to claim 1, wherein an effective radius DT11 of an object side surface of the first lens and an effective radius DT82 of an image side surface of the eighth lens satisfy 0.3 < DT11/DT82 < 0.8.
8. The imaging lens according to claim 1, wherein an effective radius DT11 of an object side surface of the first lens and an effective radius DT52 of an image side surface of the fifth lens satisfy 0.9 < DT11/DT52 < 1.3.
9. The imaging lens as claimed in claim 1, wherein an on-axis distance SAG42 between an intersection point of the fourth lens image side surface and the optical axis and an effective radius vertex of the fourth lens image side surface and a center thickness CT4 of the fourth lens on the optical axis satisfy 0.7 < SAG42/CT4 < 1.3.
10. The imaging lens system according to claim 1, wherein the sixth lens element has a convex object-side surface and a concave image-side surface.
11. The imaging lens as claimed in claim 10, wherein an on-axis distance SAG62 between an intersection of the sixth lens image side surface and the optical axis and an effective radius vertex of the sixth lens image side surface and a center thickness CT6 of the sixth lens on the optical axis satisfy-0.5 < SAG62/CT6 < 0.
12. The imaging lens according to claim 11, wherein a perpendicular distance YC62 from a critical point of the sixth lens image side to the optical axis and an effective radius DT62 of the sixth lens image side satisfy 0.4 < YC62/DT62 < 0.9.
13. The imaging lens according to claim 1, wherein a radius of curvature R11 of an object side surface of the sixth lens and a radius of curvature R12 of an image side surface of the sixth lens satisfy 0 < | (r11_r12)/(r11+r12) | < 0.3.
14. The imaging lens system according to claim 1, wherein a radius of curvature R11 of an object side surface of the sixth lens element and a radius of curvature R14 of an image side surface of the seventh lens element satisfy 0.7 < R11/R14 < 1.2.
15. The imaging lens according to any one of claims 1 to 14, wherein a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and a center thickness CT8 of the eighth lens on the optical axis satisfy 0.5 < (ct5+ct6)/(CT 7+ct 8) < 1.
16. The imaging lens according to any one of claims 1 to 14, wherein a sum Σet of edge thicknesses of the first lens to the eighth lens in a direction parallel to the optical axis and a sum Σct of center thicknesses of the first lens to the eighth lens in the optical axis, respectively, satisfy 0.6 < Σet/Σct+.1.
17. The imaging lens sequentially comprises, 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, characterized in that,
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, and the image side surface of the second lens is a convex surface;
the third lens has optical power;
the fourth lens has optical power;
the fifth lens has optical power;
the sixth lens has optical power;
the seventh lens has optical power;
the eighth lens is provided with focal power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface; and
the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy 1 < f1/f2 < 1.5;
a separation distance T34 of the third lens and the fourth lens on the optical axis and a separation distance T45 of the fourth lens and the fifth lens on the optical axis satisfy 0 < T34 multiplied by 10/T45 < 0.5;
at least one mirror surface from the object side surface of the first lens to the image side surface of the eighth lens is an aspheric mirror surface.
18. The imaging lens of claim 17, wherein the total effective focal length f of the imaging lens and the entrance pupil diameter EPD of the imaging lens satisfy f/EPD < 1.9.
19. The imaging lens of claim 17, wherein a distance TTL between an object side surface of the first lens and an imaging surface of the imaging lens on the optical axis and a half of a diagonal length ImgH of an effective pixel area of an electronic light sensing element of the imaging lens satisfy TTL/ImgH < 1.65.
20. The imaging lens according to claim 17, wherein a total effective focal length f of the imaging lens and an effective focal length f1 of the first lens satisfy f/f1 < 0.7.
21. The imaging lens as claimed in claim 17, wherein,
the third lens has positive focal power
The curvature radius R6 of the image side surface of the third lens and the effective focal length f3 of the third lens meet R6/f3 which is less than 0 and less than 0.
22. The imaging lens as claimed in claim 17, wherein a center thickness CT5 of the fifth lens element, a center thickness CT6 of the sixth lens element, a center thickness CT7 of the seventh lens element, and a center thickness CT8 of the eighth lens element satisfy 0.5 < (ct5+ct6)/(ct7+ct8) < 1.
23. The imaging lens according to claim 17, wherein a sum Σet of edge thicknesses of the first lens to the eighth lens in a direction parallel to the optical axis and a sum Σct of center thicknesses of the first lens to the eighth lens on the optical axis, respectively, satisfy 0.6 < Σet/Σct+..
24. The imaging lens system according to any one of claims 17 to 23, wherein a radius of curvature R15 of an object side surface of the eighth lens element and a radius of curvature R16 of an image side surface of the eighth lens element satisfy 1 < R15/R16 < 1.5.
25. The imaging lens system according to any one of claims 17 to 23, wherein an effective radius DT11 of an object side surface of the first lens element and an effective radius DT82 of an image side surface of the eighth lens element satisfy 0.3 < DT11/DT82 < 0.8.
26. The imaging lens system according to any one of claims 17 to 23, wherein an effective radius DT11 of an object side surface of the first lens element and an effective radius DT52 of an image side surface of the fifth lens element satisfy 0.9 < DT11/DT52 < 1.3.
27. The imaging lens system according to any one of claims 17 to 23, wherein an on-axis distance SAG42 between an intersection of the fourth lens image side surface and the optical axis and an effective radius vertex of the fourth lens image side surface and a center thickness CT4 of the fourth lens on the optical axis satisfy 0.7 < SAG42/CT4 < 1.3.
28. The imaging lens system according to any one of claims 17 to 23, wherein an on-axis distance SAG62 between an intersection of the sixth lens image side surface and the optical axis and an effective radius vertex of the sixth lens image side surface and a center thickness CT6 of the sixth lens on the optical axis satisfy-0.5 < SAG62/CT6 < 0.
29. The imaging lens according to any one of claims 17 to 23, wherein a perpendicular distance YC62 from a critical point of the sixth lens image side surface to the optical axis and an effective radius DT62 of the sixth lens image side surface satisfy 0.4 < YC62/DT62 < 0.9.
30. The imaging lens system according to any one of claims 17 to 23, wherein a radius of curvature R11 of an object side surface of the sixth lens and a radius of curvature R12 of an image side surface of the sixth lens satisfy 0 < | (r11_r12)/(r11+r12) | < 0.3.
31. The imaging lens system according to any one of claims 17 to 23, wherein a radius of curvature R11 of an object side surface of the sixth lens element and a radius of curvature R14 of an image side surface of the seventh lens element satisfy 0.7 < R11/R14 < 1.2.
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