CN109298515B - Image pickup lens - Google Patents

Image pickup lens Download PDF

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Publication number
CN109298515B
CN109298515B CN201811507963.5A CN201811507963A CN109298515B CN 109298515 B CN109298515 B CN 109298515B CN 201811507963 A CN201811507963 A CN 201811507963A CN 109298515 B CN109298515 B CN 109298515B
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lens
imaging
imaging lens
image
curvature
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CN109298515A (en
Inventor
丁玲
吕赛锋
闻人建科
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to CN202111373253.XA priority Critical patent/CN113960765B/en
Priority to CN201811507963.5A priority patent/CN109298515B/en
Publication of CN109298515A publication Critical patent/CN109298515A/en
Priority to PCT/CN2019/099393 priority patent/WO2020119145A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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

Abstract

The application discloses an imaging lens, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power. Wherein the first lens has negative optical power; the fourth lens has positive focal power; the seventh lens has negative focal power; at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical. The effective focal length fx of the imaging lens in the X-axis direction and the effective focal length fy of the imaging lens in the Y-axis direction satisfy 0.8 < fx/fy < 1.2.

Description

Image pickup lens
Technical Field
The present application relates to an imaging lens, and more particularly, to an imaging lens including seven lenses.
Background
In recent years, with the rapid development of the field of mobile phone imaging and the popularization of chips of large-size and high-pixel Complementary Metal Oxide Semiconductor (CMOS) devices or photosensitive coupling devices (CCDs), manufacturers of large mobile phones have demanded to make the lens thinner and smaller, and at the same time, have made stringent demands on the imaging quality of the lens. In addition to requiring high resolution and large aperture for lens imaging, excellent imaging quality over a wide field of view is also required.
However, most of the lenses currently in the market mainly adopt a lens surface type which is a rotationally symmetrical (axisymmetrical) aspheric surface, and the rotationally symmetrical aspheric surface can be regarded as a curve formed by rotating 360 degrees around the optical axis in a meridian plane, and the curve has enough freedom degree only in the meridian plane, so that the curve can only correct the meridian aberration well, but not correct the sagittal aberration well.
Disclosure of Invention
The present application provides an imaging lens applicable to a portable electronic product, which can at least solve or partially solve at least one of the above-mentioned drawbacks in the prior art.
In one aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length fx of the imaging lens in the X-axis direction and the effective focal length fy of the imaging lens in the Y-axis direction can satisfy 0.8 < fx/fy < 1.2.
In one embodiment, the full field angle FOV of the camera lens may satisfy 150 ° < FOV < 190 °.
In one embodiment, the effective focal length fx of the imaging lens in the X-axis direction and the entrance pupil diameter EPDx of the imaging lens in the X-axis direction can satisfy fx/EPDx < 2.0; and the effective focal length fy of the imaging lens in the Y-axis direction and the entrance pupil diameter EPDy of the imaging lens in the Y-axis direction can meet the requirement that fy/EPDy is less than 2.0.
In one embodiment, the effective focal length f7 of the seventh lens and the effective focal length f1 of the first lens may satisfy 0.3 < f7/f1 < 1.3.
In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens may satisfy 0.5 < f4/f6 < 1.5.
In one embodiment, the radius of curvature R10 of the image side of the fifth lens and the effective focal length f5 of the fifth lens may satisfy-1 < R10/f5 < 0.
In one embodiment, the radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy 0.2 < (R1-R2)/(R1+R2) < 0.7.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens element, the radius of curvature R8 of the image-side surface of the fourth lens element, the radius of curvature R3 of the object-side surface of the second lens element and the radius of curvature R4 of the image-side surface of the second lens element may satisfy 0.3 < (R7-R8)/(r3+r4) < 1.3.
In one embodiment, the separation distance T12 between the first lens and the second lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis may satisfy 0.8 < T12/(CT 4+ CT6+ CT 7) < 1.8.
In one embodiment, the effective half-caliber DT12 of the image side of the first lens, the effective half-caliber DT22 of the image side of the second lens and the effective half-caliber DT32 of the image side of the third lens may satisfy 0.8 < DT 12/(DT 22+DT 32) < 1.2.
In one embodiment, the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens may satisfy 0.5 < ET6/CT6×5 < 1.5.
In one embodiment, the imaging lens may further include a diaphragm, and the distance SL between the diaphragm and the imaging surface of the imaging lens on the optical axis and the distance TTL between the center of the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis may satisfy 0.3 < SL/TTL < 0.6.
In one embodiment, the image side surface of the sixth lens may be convex.
In one embodiment, the object-side surface of the seventh lens may be concave, and the image-side surface may be concave.
In another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The full field angle FOV of the camera lens may satisfy 150 ° < FOV < 190 °.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length fx of the X-axis direction of the imaging lens and the entrance pupil diameter EPDx of the X-axis direction of the imaging lens can meet the condition that fx/EPDx is less than 2.0; and the effective focal length fy of the imaging lens in the Y-axis direction and the entrance pupil diameter EPDy of the imaging lens in the Y-axis direction can meet the requirement that fy/EPDy is less than 2.0.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length f7 of the seventh lens and the effective focal length f1 of the first lens can satisfy 0.3 < f7/f1 < 1.3.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length f4 of the fourth lens and the effective focal length f6 of the sixth lens can satisfy 0.5 < f4/f6 < 1.5.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The curvature radius R10 of the image side surface of the fifth lens and the effective focal length f5 of the fifth lens can satisfy-1 < R10/f5 < 0.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The radius of curvature R1 of the object-side surface of the first lens and the radius of curvature R2 of the image-side surface of the first lens may satisfy 0.2 < (R1-R2)/(R1+R2) < 0.7.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The radius of curvature R7 of the object-side surface of the fourth lens element, the radius of curvature R8 of the image-side surface of the fourth lens element, the radius of curvature R3 of the object-side surface of the second lens element and the radius of curvature R4 of the image-side surface of the second lens element may satisfy 0.3 < (R7-R8)/(R3+R4) < 1.3.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The interval distance T12 between the first lens and the second lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the center thickness CT7 of the seventh lens on the optical axis may satisfy 0.8 < T12/(CT 4+ CT6+ CT 7) < 1.8.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The effective half-caliber DT12 of the image side surface of the first lens, the effective half-caliber DT22 of the image side surface of the second lens, and the effective half-caliber DT32 of the image side surface of the third lens may satisfy 0.8 < DT 12/(dt22+dt32) < 1.2.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens may satisfy 0.5 < ET6/CT6×5 < 1.5.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the seventh lens may have negative optical power; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical. The imaging lens can further comprise a diaphragm, and the distance SL between the diaphragm and the imaging surface of the imaging lens on the optical axis and the distance TTL between the center of the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis can be more than 0.3 and less than SL/TTL and less than 0.6.
In still another aspect, the present application provides an imaging lens sequentially including, 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, and a seventh lens having optical power. Wherein the first lens may have a negative optical power; the fourth lens may have positive optical power; the image side surface of the sixth lens element may be convex; the seventh lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; at least one of the first to seventh lenses may have an aspherical surface that is non-rotationally symmetrical.
The application adopts a plurality of (e.g. seven) lenses, and the imaging lens has at least one beneficial effect of miniaturization, wide angle, high pixel and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens and the like. In addition, by introducing the non-rotationally symmetrical aspheric surface, the off-axis meridian aberration and the sagittal aberration of the imaging lens are corrected simultaneously, so that the optical performance of the optical system is greatly improved.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
Fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application;
fig. 2 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 1 is within the first quadrant;
fig. 3 is a schematic diagram showing the structure of an imaging lens according to embodiment 2 of the present application;
fig. 4 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 2 is within the first quadrant;
fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application;
fig. 6 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 3 is within the first quadrant;
fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application;
fig. 8 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 4 is within the first quadrant;
fig. 9 is a schematic diagram showing the structure of an imaging lens according to embodiment 5 of the present application;
fig. 10 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 5 is within the first quadrant;
fig. 11 is a schematic diagram showing the structure of an imaging lens according to embodiment 6 of the present application;
fig. 12 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 6 is within the first quadrant;
Fig. 13 is a schematic diagram showing the structure of an imaging lens according to embodiment 7 of the present application;
fig. 14 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 7 is within the first quadrant;
fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application;
fig. 16 schematically shows a case where the RMS spot diameter of the imaging lens of embodiment 8 is within the first quadrant.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. In each lens, the surface closest to the subject is referred to as the subject side of the lens; in each lens, the surface closest to the imaging plane is referred to as the image side of the lens.
Herein, we define a direction parallel to the optical axis as a Z-axis direction, a direction perpendicular to the Z-axis and lying in the meridian plane of the central field of view as a Y-axis direction, and a direction perpendicular to the Z-axis and lying in the sagittal plane of the central field of view as an X-axis direction. Unless otherwise specified, each parameter symbol (e.g., radius of curvature, etc.) other than the parameter symbol related to the field of view herein represents a characteristic parameter value in the Y-axis direction of the imaging lens. For example, unless otherwise specified, R1 in the conditional expression "(R1-R2)/(r1+r2)" represents the radius of curvature R1Y in the Y-axis direction of the object side surface of the first lens, and R2 represents the radius of curvature R2Y in the Y-axis direction of the image side surface of the first lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The imaging lens according to the exemplary embodiment of the present application may include, for example, seven lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis. In the first lens to the seventh lens, any adjacent two lenses may have an air space therebetween.
In an exemplary embodiment, the first lens may have negative power, the fourth lens may have positive power, and the seventh lens may have negative power. The focal power of each lens is reasonably configured, so that the spherical aberration and chromatic aberration of the system can be effectively corrected, the focal power can be prevented from being excessively concentrated in a single lens, the sensitivity of the lens is reduced, and loose tolerance conditions are provided for actual processing and assembly processes.
In an exemplary embodiment, the fifth lens may have negative optical power.
In an exemplary embodiment, the sixth lens may have positive optical power.
In an exemplary embodiment, the image side surface of the sixth lens may be convex; the object-side surface of the seventh lens element may be concave, and the image-side surface may be concave. The sixth lens and the seventh lens are reasonably distributed, the incidence angle and the emergence angle of the light at the seventh lens are reduced, the system chief ray angle and the chip can be better matched, and meanwhile, the generation of total reflection ghost images caused by overlarge deflection angle is avoided.
In an exemplary embodiment, the object-side surface of the first lens may be convex and the image-side surface may be concave; the object side surface of the second lens element may be convex, and the image side surface thereof may be concave; the fourth lens element may have a convex object-side surface and a convex image-side surface; the image side surface of the fifth lens may be concave.
In an exemplary embodiment, the image quality may be further improved by setting the object side surface and/or the image side surface of at least one of the first to seventh lenses to be an aspherical surface that is non-rotationally symmetrical. The non-rotationally symmetrical aspheric surface is a free-form surface, and the non-rotationally symmetrical component is added on the basis of the rotationally symmetrical aspheric surface, so that the introduction of the non-rotationally symmetrical aspheric surface in the lens system is beneficial to effectively correcting the off-axis meridian aberration and the sagittal aberration, can effectively reduce the astigmatism and the field curvature of the off-axis visual field, and greatly improves the performance of the optical system. The imaging lens according to the present application may include at least one non-rotationally symmetrical aspherical surface, for example, one non-rotationally symmetrical aspherical surface, two non-rotationally symmetrical aspherical surfaces, three non-rotationally symmetrical aspherical surfaces, or a plurality of non-rotationally symmetrical aspherical surfaces.
In the following embodiments, the object side surface of the second lens element, the object side surface of the third lens element and the image side surface of the seventh lens element in embodiment 1; the object side of the first lens, the object side of the second lens and the object side of the fourth lens in embodiment 2; the object side surface of the first lens and the image side surface of the second lens in embodiment 3; the object side surface of the first lens and the image side surface of the second lens in embodiment 4; the object side of the first lens, the object side of the third lens and the object side of the fourth lens in embodiment 5; an object side surface of the first lens element, an object side surface of the third lens element, an object side surface of the fourth lens element and an object side surface of the fifth lens element in embodiment 6; an image side surface of the third lens in embodiment 7; in embodiment 8, the image side surfaces of the sixth lens element are each aspheric with no rotational symmetry, i.e., free-form surfaces.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.8 < fx/fy < 1.2, where fx is an effective focal length in an X-axis direction of the imaging lens and fy is an effective focal length in a Y-axis direction of the imaging lens. More specifically, fx and fy may further satisfy 0.83.ltoreq.fx/fy.ltoreq.1.11. Satisfies the condition that fx/fy is smaller than 0.8 and smaller than 1.2, and can ensure that the system has smaller spherical aberration in the X-axis direction and the Y-axis direction.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional 150 ° < FOV < 190 °, where FOV is the full field angle of the imaging lens. More specifically, the FOV may further satisfy 164.ltoreq.FOV.ltoreq.176. The visual angle is reasonably controlled, so that the system can be guaranteed to have good imaging quality for a wider visual field range, and the phenomenon that the illuminance of an edge visual field is low can be avoided.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression fi/EPDi < 2.0, where i is x or y. When i is X, fx is the effective focal length of the imaging lens in the X-axis direction, EPDx is the entrance pupil diameter of the imaging lens in the X-axis direction, and fx/EPDx is less than 2.0. When i is Y, fy is the effective focal length of the imaging lens in the Y-axis direction, EPDy is the entrance pupil diameter of the imaging lens in the Y-axis direction, and fy/EPDy is less than 2.0. More specifically, fx and EPDx may further satisfy 1.79. Ltoreq.fi/EPDi.ltoreq.1.98, and fy and EPDy may further satisfy 1.79. Ltoreq.fi/EPDi.ltoreq.1.98. The conditional fi/EPDI is less than 2.0, the light flux of the system can be effectively increased, the illumination of the edge view field is improved, and the lens is ensured to have good shooting effect in a dark environment.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.3 < f7/f1 < 1.3, where f7 is an effective focal length of the seventh lens and f1 is an effective focal length of the first lens. More specifically, f7 and f1 may further satisfy 0.51.ltoreq.f7/f1.ltoreq.1.02. The effective focal lengths of the first lens and the seventh lens are reasonably controlled, so that focal power concentration in the first lens can be avoided, the sensitivity of the first lens can be reduced, and meanwhile, spherical aberration and curvature of field which are not completely eliminated by the six lenses in the front can be balanced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.5 < f4/f6 < 1.5, where f4 is an effective focal length of the fourth lens and f6 is an effective focal length of the sixth lens. More specifically, f4 and f6 may further satisfy 0.79.ltoreq.f4/f6.ltoreq.1.23. The optical power of the fourth lens and the sixth lens is reasonably controlled, the deflection angles of light rays at the fourth lens and the sixth lens are reduced, total reflection ghost images generated due to overlarge deflection angles are avoided, and in addition, astigmatism generated by the two lenses can be effectively balanced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition of-1 < R10/f5 < 0, where R10 is a radius of curvature of an image side surface of the fifth lens, and f5 is an effective focal length of the fifth lens. More specifically, R10 and f5 may further satisfy-0.8 < R10/f5 < -0.3, for example, -0.72.ltoreq.R10/f 5.ltoreq.0.36. The ratio of the curvature radius of the image side surface of the fifth lens to the effective focal length of the fifth lens is reasonably configured, so that the deflection of light rays at the lens can be slowed down, and the high-grade coma and astigmatism generated by the lens can be reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression of 0.2 < (R1-R2)/(r1+r2) < 0.7, where R1 is a radius of curvature of an object side surface of the first lens and R2 is a radius of curvature of an image side surface of the first lens. More specifically, R1 and R2 may further satisfy 0.40.ltoreq.R 1-R2)/(R1+R2). Ltoreq.0.52. The curvature radius of the object side surface and the image side surface of the first lens is reasonably controlled, so that the light rays with a large angle view field can be effectively converged, and astigmatism and distortion generated by the first lens can be reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.3 < (R7-R8)/(r3+r4) < 1.3, wherein R7 is a radius of curvature of an object side surface of the fourth lens element, R8 is a radius of curvature of an image side surface of the fourth lens element, R3 is a radius of curvature of an object side surface of the second lens element, and R4 is a radius of curvature of an image side surface of the second lens element. More specifically, R7, R8, R3 and R4 may further satisfy 0.39.ltoreq.R 7-R8)/(R3+R4). Ltoreq.1.11. By reasonably controlling R7, R8, R3 and R4, the incidence angle and the emergence angle of light rays on the fourth lens and the second lens are controlled, the sensitivity of the two lenses is reduced, and in addition, the high-grade coma generated by the two lenses can be effectively balanced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.8 < T12/(CT 4+ct6+ct 7) < 1.8, where T12 is the distance between the first lens and the second lens on the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and CT7 is the center thickness of the seventh lens on the optical axis. More specifically, T12, CT4, CT6 and CT7 may further satisfy 0.93.ltoreq.T12/(CT4+CT6+CT7). Ltoreq.1.78. T12, CT4, CT6 and CT7 are reasonably controlled to ensure the feasibility of actual processing of the lenses while ensuring the miniaturization of the lenses, and in addition, the incident angle of light entering the second lens is reduced, and the sensitivity of the second lens is reduced.
In an exemplary embodiment, the imaging lens of the present application may further include a diaphragm to improve the imaging quality of the lens. A stop may be disposed between the third lens and the fourth lens. The distance SL between the diaphragm and the imaging surface of the imaging lens on the optical axis and the distance TTL between the center of the object side surface of the first lens and the imaging surface of the imaging lens on the optical axis can satisfy 0.3 < SL/TTL < 0.6. More specifically, SL and TTL may further satisfy 0.43. Ltoreq.SL/TTL.ltoreq.0.50. Through the reasonable control of the ratio range of SL to TTL, the off-axis visual field can be ensured to have larger light flux, the illuminance of the off-axis visual field is enhanced, and the size of the front lens and the rear lens of the diaphragm is reduced.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.8 < DT 12/(dt22+dt32) < 1.2, where DT12 is the effective half-caliber of the image side surface of the first lens, DT22 is the effective half-caliber of the image side surface of the second lens, and DT32 is the effective half-caliber of the image side surface of the third lens. More specifically, DT12, DT22, and DT32 may further satisfy 0.91.ltoreq.DT 12/(DT 22+DT 32). Ltoreq.0.99. The effective half calibers of the image side surfaces of the first lens, the second lens and the third lens are reasonably controlled, so that the size of the front end of the lens can be reduced, and the acceptable field angle of the system can be increased.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0.5 < ET6/CT6×5 < 1.5, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens. More specifically, ET6 and CT6 may further satisfy 0.59+.et 6/CT 6.5+.1.32. The edge thickness and the center thickness of the sixth lens are reasonably controlled, the manufacturability of the lens can be ensured, the size can be further reduced, and in addition, the deflection of light rays at the sixth lens can be slowed down.
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, such as seven 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 is applicable to portable electronic products. In addition, by introducing the non-rotationally symmetrical aspheric surface, the off-axis meridian aberration and the sagittal aberration of the imaging lens are corrected, so that the imaging image quality can be further improved. The imaging lens with the configuration can also have the beneficial effects of wide angle, high resolution, large aperture and the like.
In the embodiment of the present application, aspherical mirror surfaces are often used as the mirror surfaces of the respective lenses. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens may be aspherical. Alternatively, each of the first, second, third, fourth, fifth, sixth, and seventh lenses may be aspherical in object side and image side.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although seven lenses are described as an example in the embodiment, the imaging lens is not limited to include seven 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 and 2. Fig. 1 shows a schematic configuration diagram of an imaging lens according to embodiment 1 of the present application.
As shown in fig. 1, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, and has a concave object-side surface S13 and a convex image-side surface S14. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 1 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 1, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 1
It should be understood that the "radius of curvature X" and "conic coefficient X" not specifically indicated (blank) in the above table remain consistent with the corresponding values of "radius of curvature Y" and "conic coefficient Y". The following examples are similar.
As can be seen from table 1, the object side surface and the image side surface of any one of the first lens element E1, the fourth lens element E4, the fifth lens element E5 and the sixth lens element E6, the image side surface S4 of the second lens element E2, the image side surface S6 of the third lens element E3 and the object side surface S13 of the seventh lens element E7 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for the aspherical mirror surfaces S1, S2, S4, S6-S13 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 -2.4449E-01 -4.0758E-03 2.9349E-03 -2.1262E-03 1.0570E-03 -3.2536E-05 -1.3564E-04 4.4720E-05 -4.6481E-06
S2 6.4184E-02 3.9135E-02 1.8464E-02 -8.6679E-03 -5.6073E-03 -5.0265E-03 -7.8539E-04 -5.6553E-04 5.6629E-04
S4 -1.6329E-02 -5.5041E-03 -1.2443E-05 9.4669E-05 7.6958E-05 -4.5130E-05 1.0325E-05 -8.0119E-06 1.6330E-06
S6 -6.6069E-03 3.5413E-03 8.1493E-05 -2.7338E-04 -1.2204E-04 1.4275E-05 1.4139E-05 2.3420E-05 2.0252E-05
S7 -1.0380E-03 1.9385E-03 2.9131E-04 6.9794E-05 -1.4886E-05 6.2031E-06 -6.9227E-06 -5.0318E-06 8.4592E-06
S8 -1.7079E-02 3.4317E-03 5.3480E-04 1.3465E-04 -1.4706E-05 7.4556E-06 -6.5787E-06 -1.4031E-06 -6.2384E-06
S9 -1.4602E-01 5.4174E-03 -3.9485E-05 1.8218E-04 -1.5456E-04 3.5419E-05 -1.9499E-05 1.6033E-06 -4.2503E-07
S10 -8.8744E-02 1.0733E-02 6.5272E-06 4.7534E-04 -4.2203E-04 1.9058E-04 -7.3039E-05 1.5777E-05 -1.3180E-06
S11 5.4918E-03 -4.9493E-03 1.6150E-04 7.8498E-04 -1.9425E-04 2.6811E-04 -8.7080E-05 1.0450E-05 -5.9322E-07
S12 -1.8656E-01 1.7550E-02 -8.2525E-03 1.7237E-03 2.9190E-04 5.1849E-04 1.5316E-04 1.3618E-04 6.8660E-05
S13 -7.7922E-01 1.2023E-01 -2.0666E-02 3.9603E-03 -3.9224E-04 4.9948E-04 -3.7351E-04 1.3860E-04 -1.9884E-05
TABLE 2
As can be seen from table 1, the object-side surface S3 of the second lens element E2, the object-side surface S5 of the third lens element E3, and the image-side surface S14 of the seventh lens element E7 are non-rotationally symmetrical aspheric surfaces (i.e., AAS surfaces), and the non-rotationally symmetrical aspheric surface shape can be defined by, but not limited to, the following non-rotationally symmetrical aspheric surface formula:
wherein Z is the sagittal height of the plane parallel to the Z-axis direction; cx, cy are the curvature (=1/radius of curvature) of the apex of the X, Y axial direction surface, respectively; kx and Ky are X, Y axial cone coefficients respectively; AR, BR, CR, DR, ER, FR, GR, HR, JR are the 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients in the aspheric rotationally symmetric component, respectively; AP, BP, CP, DP, EP, FP, GP, HP, JP are the 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, 20 th coefficients, respectively, of the aspheric non-rotationally symmetric component. Table 3 below gives the coefficients of the non-rotationally symmetrical aspheres S3, S5 and S14 that can be used in example 1.
TABLE 3 Table 3
Table 4 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 1, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
f1(mm) -2.78 f7(mm) -2.85
f2(mm) 7.05 fx(mm) 1.16
f3(mm) -19.21 fy(mm) 1.41
f4(mm) 2.42 TTL(mm) 7.75
f5(mm) -3.38 ImgH(mm) 2.37
f6(mm) 2.01
TABLE 4 Table 4
The imaging lens in embodiment 1 satisfies:
fx/fy=0.83, where fx is an effective focal length in the X-axis direction of the imaging lens, and fy is an effective focal length in the Y-axis direction of the imaging lens;
FOV = 172.0, where FOV is the full field angle of the imaging lens;
fx/epdx=1.98, where fx is an effective focal length in the X-axis direction of the imaging lens, and EPDx is an entrance pupil diameter in the X-axis direction of the imaging lens;
fy/epdy=1.98, where fy is the effective focal length in the Y-axis direction of the imaging lens, and EPDy is the entrance pupil diameter in the Y-axis direction of the imaging lens;
f7/f1=1.02, where f7 is the effective focal length of the seventh lens E7 and f1 is the effective focal length of the first lens E1;
f4/f6=1.21, where f4 is the effective focal length of the fourth lens E4 and f6 is the effective focal length of the sixth lens E6;
r10/f5= -0.59, where R10 is the radius of curvature of the image side surface S10 of the fifth lens element E5, and f5 is the effective focal length of the fifth lens element E5;
(R1-R2)/(r1+r2) =0.41, wherein R1 is the radius of curvature of the object-side surface S1 of the first lens element E1, and R2 is the radius of curvature of the image-side surface S2 of the first lens element E1;
(R7-R8)/(r3+r4) =1.11, wherein R7 is a radius of curvature of the object-side surface S7 of the fourth lens element E4, R8 is a radius of curvature of the image-side surface S8 of the fourth lens element E4, R3 is a radius of curvature of the object-side surface S3 of the second lens element E2, and R4 is a radius of curvature of the image-side surface S4 of the second lens element E2;
T12/(CT 4+ct6+ct 7) =1.59, where T12 is the distance between the first lens E1 and the second lens E2 on the optical axis, CT4 is the center thickness of the fourth lens E4 on the optical axis, CT6 is the center thickness of the sixth lens E6 on the optical axis, and CT7 is the center thickness of the seventh lens E7 on the optical axis;
SL/ttl=0.45, where SL is a distance between the stop STO and the imaging surface S15 of the imaging lens on the optical axis, and TTL is a distance between the center of the object side surface S1 of the first lens E1 and the imaging surface S15 of the imaging lens on the optical axis;
DT 12/(dt22+dt32) =0.93, wherein DT12 is the effective half-caliber of the image side surface S2 of the first lens element E1, DT22 is the effective half-caliber of the image side surface S4 of the second lens element E2, and DT32 is the effective half-caliber of the image side surface S6 of the third lens element E3;
ET6/CT6 5 = 1.12, where ET6 is the edge thickness of the sixth lens E6 and CT6 is the center thickness of the sixth lens E6 on the optical axis.
Fig. 2 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 1 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 2, 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 and 4. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration 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, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 5 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 2, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 5
As can be seen from table 5, in example 2, the object side surface and the image side surface of any one of the third lens element E3, the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7, the image side surface S2 of the first lens element E1, the image side surface S4 of the second lens element E2 and the image side surface S8 of the fourth lens element E4 are aspheric; the object side surface S1 of the first lens element E1, the object side surface S3 of the second lens element E2, and the object side surface S7 of the fourth lens element E4 are aspheric with non-rotational symmetry.
Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 7 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S1, S3, and S7 in embodiment 2, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S2 2.3465E-01 6.3082E-02 2.1192E-02 8.0560E-03 3.3184E-03 1.2944E-03 4.6628E-04 1.1812E-04 3.4662E-05
S4 -5.2318E-02 -8.9469E-03 6.8059E-03 1.4976E-03 2.4248E-04 1.6011E-04 8.6168E-05 2.1305E-05 9.6933E-06
S5 -4.0631E-02 -4.6218E-03 1.2812E-03 1.0554E-04 -1.1336E-04 -2.2841E-05 4.0192E-06 8.1818E-07 -1.0891E-06
S6 -1.7006E-03 -1.1233E-03 -1.0815E-04 -2.8034E-05 -3.2834E-05 -6.0254E-06 1.5226E-06 9.3152E-07 -3.3214E-07
S8 -9.6832E-03 4.3339E-03 -1.8870E-04 -2.7964E-05 -3.4998E-05 -1.9200E-05 -1.1648E-05 -4.5806E-06 -1.4146E-06
S9 -1.5034E-01 3.5503E-03 -2.7356E-04 1.7862E-04 2.4901E-04 1.0595E-04 2.6975E-05 1.8566E-06 -4.1196E-07
S10 -6.4201E-02 1.3720E-02 1.5041E-03 -2.6648E-04 3.1253E-04 1.8982E-05 3.2914E-05 2.5992E-06 1.4536E-06
S11 1.5953E-02 -2.4197E-03 -1.8841E-03 7.8255E-04 -3.4507E-05 -1.0618E-04 -1.1089E-04 -7.2531E-05 -3.2622E-05
S12 -3.0114E-01 4.5428E-03 -3.5410E-03 1.6302E-03 -7.3816E-04 -4.1653E-04 -2.9162E-05 9.0402E-05 4.7005E-05
S13 -4.4431E-01 4.0067E-02 4.2011E-03 2.1925E-03 2.2857E-04 -7.5246E-05 -7.0691E-05 -3.4841E-05 2.4814E-06
S14 -6.6535E-01 2.6361E-02 -2.9663E-03 9.7812E-03 7.9532E-04 1.7803E-04 1.3915E-04 9.4217E-05 -2.5316E-05
TABLE 6
TABLE 7
Table 8 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 2, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
f1(mm) -3.78 f7(mm) -1.93
f2(mm) -122.00 fx(mm) 1.69
f3(mm) 16.70 fy(mm) 1.61
f4(mm) 2.44 TTL(mm) 7.40
f5(mm) -6.12 ImgH(mm) 2.36
f6(mm) 2.17
TABLE 8
Fig. 4 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 2 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 4, 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 and 6. Fig. 5 shows a schematic configuration diagram of an imaging lens according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 9 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 3, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 9
As can be seen from table 9, in example 3, the object side surface and the image side surface of any one of the third lens element E3, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7, the image side surface S2 of the first lens element E1 and the object side surface S3 of the second lens element E2 are aspheric; the object side surface S1 of the first lens element E1 and the image side surface S4 of the second lens element E2 are aspheric with respect to non-rotational symmetry.
Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 11 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S1 and S4 in embodiment 3, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S2 2.0457E-01 5.6259E-02 2.3871E-02 9.4016E-03 3.7805E-03 1.1541E-03 2.4478E-04 -2.0237E-05 -6.5531E-06
S3 -2.7366E-02 -9.6887E-03 5.7396E-04 1.7664E-04 7.2544E-06 -8.2933E-06 2.6266E-06 -1.7883E-06 3.4583E-07
S5 -4.0142E-02 -5.3322E-03 1.3285E-03 -1.4802E-04 -1.6448E-04 -8.9667E-05 -8.7373E-05 -4.9714E-05 -1.6129E-05
S6 -1.5814E-03 -7.3164E-04 1.1822E-04 -2.2360E-04 -1.1819E-05 5.9528E-05 3.2491E-05 1.7135E-05 4.9656E-06
S7 3.7519E-03 1.1510E-03 2.8425E-04 6.4650E-05 7.3819E-06 2.4164E-06 1.0859E-05 9.1506E-06 2.5536E-06
S8 -9.2324E-03 4.5687E-03 4.3745E-05 -1.4325E-04 -1.6485E-04 -9.0819E-05 -2.7960E-05 -2.1198E-06 3.1937E-06
S9 -1.4804E-01 2.5791E-03 -9.1146E-04 -6.3646E-05 1.9040E-05 4.2937E-06 -1.8357E-05 -8.9897E-06 -5.1854E-06
S10 -6.2930E-02 1.1200E-02 2.0861E-04 2.1352E-04 4.1446E-04 1.5841E-04 9.7734E-05 3.7366E-05 1.4986E-05
S11 1.3755E-02 -2.2716E-03 -1.7456E-03 1.4242E-03 -4.0578E-04 3.4019E-05 -1.8842E-04 -3.8901E-05 -2.8859E-05
S12 -2.9543E-01 3.4216E-03 -4.2291E-03 -3.0474E-04 -8.2478E-04 -2.0295E-04 1.0326E-04 4.3428E-05 -1.4446E-05
S13 -4.2555E-01 3.9108E-02 6.1615E-03 1.0596E-03 -1.3065E-04 -4.6319E-04 -1.7696E-04 -1.5670E-05 -6.3161E-06
S14 -6.8332E-01 4.0852E-02 6.7273E-03 4.0172E-03 4.4909E-04 -1.5316E-03 -1.3828E-04 -1.3863E-04 -9.9145E-05
Table 10
TABLE 11
Table 12 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 3, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
Table 12
Fig. 6 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 3 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 6, 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 and 8. Fig. 7 shows a schematic configuration diagram of an imaging lens according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 13 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 4, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 13
As can be seen from table 13, in example 4, the object side surface and the image side surface of any one of the third lens element E3, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7, respectively, are aspheric on the image side surface S2 of the first lens element E1 and the object side surface S3 of the second lens element E2; the object side surface S1 of the first lens element E1 and the image side surface S4 of the second lens element E2 are aspheric with respect to non-rotational symmetry.
Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 15 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S1 and S4 in embodiment 4, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S2 4.6440E-03 5.6150E-02 3.1886E-02 1.5104E-02 7.6455E-03 3.5979E-03 1.6290E-03 5.7724E-04 1.5766E-04
S3 -2.7030E-02 -8.9947E-03 1.1153E-04 9.0738E-05 2.2793E-05 -7.9174E-06 5.3436E-06 -1.5158E-07 -3.7068E-07
S5 -3.8735E-02 -6.6328E-03 2.4576E-03 -6.9235E-04 -5.3884E-04 -1.0501E-04 1.7739E-05 2.3249E-05 6.3316E-06
S6 -3.1041E-03 2.7342E-04 1.0168E-03 -4.4969E-04 -3.0485E-04 -9.4301E-05 -1.1500E-05 4.6782E-06 3.1430E-06
S7 4.7824E-03 8.3569E-04 7.7874E-05 1.7438E-05 -5.3105E-06 -9.4479E-06 -1.3368E-05 -1.0418E-05 -3.6383E-06
S8 -1.0894E-02 4.5910E-03 -3.0725E-04 -6.0196E-06 -8.5389E-05 -5.5591E-05 -4.7199E-05 -2.6364E-05 -9.1030E-06
S9 -1.4798E-01 2.4425E-03 -1.7499E-03 -2.5894E-04 7.7547E-05 -3.3398E-05 -2.7390E-05 -1.2889E-05 -2.6166E-06
S10 -6.4463E-02 1.1224E-02 1.2576E-04 -2.3859E-04 4.9718E-04 -7.8115E-06 6.7996E-05 1.6273E-05 1.6606E-05
S11 1.3877E-02 -3.5549E-03 -2.1112E-03 1.5162E-03 -7.7741E-05 6.7330E-05 -1.4797E-04 -3.7793E-05 -4.4596E-05
S12 -2.8636E-01 3.0041E-03 -6.3512E-03 1.4190E-03 -1.3189E-03 -5.3151E-04 -3.5991E-04 -1.0764E-04 -2.9188E-05
S13 -4.3877E-01 4.9989E-02 -7.5596E-04 1.6636E-03 4.6800E-05 7.6029E-05 -7.3306E-05 -1.2959E-05 -1.9291E-06
S14 -7.1058E-01 2.5710E-02 -6.3741E-03 1.3746E-02 8.7395E-04 -3.4856E-04 2.8985E-05 -1.6945E-04 3.6013E-05
TABLE 14
TABLE 15
Table 16 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 4, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
f1(mm) -3.20 f7(mm) -1.64
f2(mm) 32.57 fx(mm) 1.34
f3(mm) 29.39 fy(mm) 1.46
f4(mm) 2.43 TTL(mm) 7.51
f5(mm) -4.88 ImgH(mm) 2.33
f6(mm) 1.97
Table 16
Fig. 8 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 4 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 8, 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 and 10. 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 E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 17 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 5, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 17
As can be seen from table 17, in example 5, the object side surface and the image side surface of any one of the second lens element E2, the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7, the image side surface S2 of the first lens element E1, the image side surface S6 of the third lens element E3 and the image side surface S8 of the fourth lens element E4 are aspheric; the object side surface S1 of the first lens element E1, the object side surface S5 of the third lens element E3, and the object side surface S7 of the fourth lens element E4 are aspheric with non-rotational symmetry.
Table 18 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 19 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S1, S5, and S7 in embodiment 5, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S2 -7.5833E-02 1.0442E-01 2.9294E-02 1.5761E-02 7.3987E-03 3.2616E-03 1.2807E-03 4.1725E-04 2.3335E-04
S3 -3.1311E-02 -9.9096E-03 7.6836E-04 2.2169E-04 3.6388E-05 -3.3661E-05 1.5428E-05 -8.6254E-06 1.9224E-06
S4 -6.6815E-02 -1.2465E-02 4.4804E-03 5.6324E-04 -9.3421E-05 7.2460E-05 3.0431E-05 -3.2596E-05 -1.6428E-05
S6 4.7392E-03 -2.5777E-04 -8.0736E-04 -9.5197E-05 -1.0523E-04 -2.8708E-05 -9.4624E-06 8.9179E-07 1.5520E-06
S8 -1.1388E-02 7.2811E-03 -1.0699E-03 -7.7532E-04 -7.8491E-05 1.7171E-04 1.3193E-04 4.1503E-05 1.4533E-05
S9 -1.7002E-01 1.0553E-02 1.4471E-03 -3.4682E-05 -3.0906E-04 -4.8854E-04 -8.1886E-05 7.7257E-05 4.1076E-05
S10 -4.7151E-02 1.3860E-02 2.0148E-03 -1.9053E-03 7.5492E-04 -6.2790E-04 6.8885E-05 1.1411E-04 3.9135E-05
S11 4.9552E-02 -1.7445E-02 3.8567E-03 -2.1460E-03 8.9895E-04 -3.3573E-04 6.8404E-05 5.6018E-06 -8.8097E-06
S12 -2.8478E-01 5.4755E-03 3.6867E-04 -4.4303E-03 -5.8742E-04 1.8538E-03 3.5287E-04 -8.3167E-05 -1.9295E-04
S13 -4.1844E-01 4.0164E-02 2.1414E-02 1.4521E-05 -3.7936E-03 -9.2219E-04 5.0741E-04 8.1519E-04 2.9423E-04
S14 -4.6961E-01 1.1276E-01 1.1156E-02 -1.7273E-02 -9.0177E-03 8.2083E-05 5.3353E-03 3.0898E-03 7.0688E-04
TABLE 18
TABLE 19
Table 20 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 5, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
f1(mm) -2.74 f7(mm) -2.12
f2(mm) -14.98 fx(mm) 1.25
f3(mm) 8.38 fy(mm) 1.13
f4(mm) 2.25 TTL(mm) 7.18
f5(mm) -17.03 ImgH(mm) 2.35
f6(mm) 1.97
Table 20
Fig. 10 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 5 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 10, 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 and 12. Fig. 11 shows a schematic configuration diagram of an imaging lens according to embodiment 6 of the present application.
As shown in fig. 11, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave in the Y-axis direction, and is convex in the X-axis direction, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 21 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 6, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 21
As can be seen from table 21, in example 6, the object side surface and the image side surface of any one of the second lens element E2, the sixth lens element E6 and the seventh lens element E7, the image side surface S2 of the first lens element E1, the image side surface S6 of the third lens element E3, the image side surface S8 of the fourth lens element E4 and the image side surface S10 of the fifth lens element E5 are aspheric; the object side surface S1 of the first lens element E1, the object side surface S5 of the third lens element E3, the object side surface S7 of the fourth lens element E4, and the object side surface S9 of the fifth lens element E5 are aspheric surfaces that are rotationally asymmetric.
Table 22 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 23 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S1, S5, S7, and S9 in embodiment 6, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Table 22
Table 23
Table 24 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 6, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
f1(mm) -2.36 f7(mm) -2.12
f2(mm) -14.92 fx(mm) 0.85
f3(mm) 9.40 fy(mm) 0.96
f4(mm) 2.10 TTL(mm) 6.98
f5(mm) -10.69 ImgH(mm) 2.34
f6(mm) 1.71
Table 24
Fig. 12 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 6 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 12, 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 and 14. Fig. 13 shows a schematic configuration diagram of an imaging lens according to embodiment 7 of the present application.
As shown in fig. 13, an imaging lens according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 25 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 7, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 25
As can be seen from table 25, in example 7, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the fourth lens element E4, the fifth lens element E5, the sixth lens element E6 and the seventh lens element E7, and the object side surface S5 of the third lens element E3 are aspheric; the image side surface S6 of the third lens E3 is an aspherical surface with non-rotational symmetry.
Table 26 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. Table 27 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S6 in embodiment 7, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.7262E-01 9.3799E-03 2.7189E-03 -1.5805E-03 2.0299E-04 6.6067E-05 -1.4410E-05 4.9276E-06 -4.7818E-06
S2 -3.4865E-01 8.5528E-02 -5.9395E-03 8.8903E-03 -2.0224E-04 1.0998E-03 -1.9552E-04 7.3721E-05 -8.6898E-05
S3 -2.6952E-02 -4.5334E-03 2.0829E-03 1.2768E-03 4.2231E-04 1.0032E-04 1.4552E-05 -4.5832E-06 -9.1425E-07
S4 -3.1730E-02 -5.4487E-03 2.1245E-03 5.9035E-04 3.6460E-05 -6.7547E-06 -1.8165E-06 -2.7685E-06 4.9654E-07
S5 -5.6721E-02 -4.2459E-04 7.5780E-04 -1.9906E-05 -6.4096E-05 -1.6565E-06 -7.2928E-06 1.0495E-06 -3.6125E-06
S7 6.1621E-04 -1.9555E-04 1.8692E-05 3.7722E-05 -1.2160E-05 6.7943E-06 -3.2533E-06 3.3251E-06 -1.8142E-06
S8 -1.5301E-02 4.7267E-03 7.6085E-05 2.1565E-05 -5.0949E-06 -4.5699E-06 -1.2798E-06 -3.8918E-07 1.1087E-07
S9 -1.9348E-01 9.6374E-03 2.6236E-05 -2.3626E-04 5.0077E-05 -1.5551E-05 -5.8334E-06 -6.5102E-06 1.8028E-07
S10 -9.0388E-02 2.4751E-02 3.0049E-04 -2.2107E-04 2.0137E-04 -1.7657E-05 4.2032E-06 2.0970E-05 7.6677E-06
S11 3.3954E-02 -7.7075E-03 2.0799E-03 1.5231E-05 2.6130E-05 1.2367E-05 -3.2666E-05 1.6944E-05 1.9716E-06
S12 -1.3402E-01 -1.0497E-02 -1.5122E-03 1.2342E-03 6.7812E-04 2.9898E-04 9.7111E-05 1.1356E-05 -4.1554E-06
S13 -7.5141E-01 8.5717E-02 -1.2242E-02 4.1003E-03 2.4532E-04 3.3045E-04 2.5317E-04 3.6704E-06 7.4628E-06
S14 -7.3929E-01 1.1609E-01 -3.7841E-02 9.5712E-03 -3.1203E-03 1.0474E-03 -9.7708E-05 4.4824E-06 4.0321E-05
Table 26
Table 27
Table 28 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 7, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
f1(mm) -2.87 f7(mm) -2.64
f2(mm) 7.08 fx(mm) 1.37
f3(mm) -16.76 fy(mm) 1.39
f4(mm) 2.20 TTL(mm) 7.75
f5(mm) -7.55 ImgH(mm) 2.32
f6(mm) 2.78
Table 28
Fig. 14 shows the magnitude of RMS spot diameter of the imaging lens of embodiment 7 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 14, the imaging lens provided in embodiment 7 can achieve good imaging quality.
Example 8
An imaging lens according to embodiment 8 of the present application is described below with reference to fig. 15 and 16. Fig. 15 shows a schematic configuration diagram of an imaging lens according to embodiment 8 of the present application.
As shown in fig. 15, 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 E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the imaging surface S15.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein the object-side surface S13 is concave, and the image-side surface S14 is concave. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
The imaging lens of the present embodiment may further include a stop STO (not shown) disposed between the third lens E3 and the fourth lens E4 to improve imaging quality.
Table 29 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens of example 8, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 29
As can be seen from table 29, in example 8, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4, the fifth lens element E5 and the seventh lens element E7, and the object side surface S11 of the sixth lens element E6 are aspheric; the image side surface S12 of the sixth lens E6 is an aspherical surface which is non-rotationally symmetrical.
Table 30 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 31 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S12 in embodiment 8, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.5350E-01 8.6270E-03 1.0007E-03 -1.7487E-03 9.6858E-04 -4.9523E-05 -4.8923E-04 3.6445E-04 -1.6119E-04
S2 -3.0366E-01 8.0580E-02 -4.2319E-03 7.9313E-03 -9.4417E-04 3.1871E-04 -1.9192E-04 9.5962E-05 6.5008E-05
S3 -1.4055E-02 -4.9697E-03 6.5035E-04 4.6306E-04 1.4598E-04 3.4094E-05 7.7084E-06 2.1298E-06 2.8692E-06
S4 -2.4290E-02 -5.2311E-03 1.2597E-03 3.1718E-04 -1.2511E-05 1.3226E-05 -3.8483E-06 7.1398E-06 -1.8264E-06
S5 -4.6957E-02 -2.3230E-04 7.4626E-04 -1.1433E-04 -1.6486E-05 -1.0420E-06 1.7239E-06 -2.5528E-06 1.9346E-06
S6 -9.0792E-03 -4.0989E-04 -6.8554E-05 -2.4691E-04 1.0502E-05 4.4176E-06 2.8706E-06 1.7228E-06 -6.7661E-07
S7 1.1799E-03 5.6883E-04 -3.8272E-04 -9.8112E-05 2.6215E-04 -1.9092E-05 -8.4784E-05 -1.0685E-04 -2.5259E-05
S8 -1.7911E-02 5.2118E-03 -1.0409E-05 -1.6831E-04 -1.7697E-04 -1.0583E-04 -6.7810E-05 -3.0458E-05 -1.2941E-05
S9 -1.5414E-01 6.7610E-03 -2.5399E-04 1.5509E-04 1.7940E-05 1.8358E-05 2.0318E-06 3.2338E-06 5.4920E-07
S10 -7.7720E-02 1.3785E-02 -5.3054E-04 1.0376E-04 4.7703E-05 8.9078E-07 -5.8704E-06 5.0013E-06 -1.8955E-06
S11 1.3297E-02 -5.9096E-03 -1.2253E-04 -6.0527E-06 1.6017E-04 -4.3261E-05 2.1815E-05 -6.8024E-06 -2.7528E-06
S13 -8.4754E-01 1.0274E-01 -1.1610E-02 5.7552E-03 -1.0599E-04 -4.5340E-05 -1.3822E-04 -5.6682E-05 7.7182E-05
S14 -8.2276E-01 1.4889E-01 -3.5502E-02 1.4634E-02 -4.6493E-03 1.6843E-03 -3.8769E-04 3.5317E-04 1.7231E-04
Table 30
Table 31
Table 32 shows effective focal lengths f1 to f7 of the respective lenses in embodiment 8, an effective focal length fx in the X-axis direction of the imaging lens, an effective focal length fy in the Y-axis direction of the imaging lens, a distance TTL from the center of the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis, and a half of the diagonal length ImgH of the effective pixel region on the imaging surface S15.
f1(mm) -2.86 f7(mm) -2.38
f2(mm) 7.05 fx(mm) 1.39
f3(mm) -17.18 fy(mm) 1.36
f4(mm) 2.28 TTL(mm) 7.73
f5(mm) -3.29 ImgH(mm) 2.32
f6(mm) 1.99
Table 32
Fig. 16 shows the magnitude of RMS spot diameter of the imaging lens of example 8 corresponding to the angle of view in different object spaces in the first quadrant. As can be seen from fig. 16, the imaging lens provided in embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 33.
Conditional\embodiment 1 2 3 4 5 6 7 8
fx/fy 0.83 1.05 1.09 0.92 1.11 0.89 0.99 1.02
FOV(°) 172.0 176.0 170.0 164.0 175.0 175.0 172.0 172.0
fi/EPDI (i is x or y) 1.98 1.89 1.84 1.83 1.88 1.88 1.79 1.82
f7/f1 1.02 0.51 0.83 0.51 0.77 0.90 0.92 0.83
f4/f6 1.21 1.12 1.20 1.23 1.15 1.23 0.79 1.14
R10/f5 -0.59 -0.36 -0.38 -0.36 -0.45 -0.69 -0.59 -0.72
(R1-R2)/(R1+R2) 0.41 0.48 0.52 0.44 0.46 0.50 0.40 0.40
(R7-R8)/(R3+R4) 1.11 0.76 0.72 0.79 0.75 0.39 0.99 1.09
T12/(CT4+CT6+CT7) 1.59 0.95 0.98 0.93 1.15 1.31 1.78 1.54
SL/TTL 0.45 0.50 0.49 0.49 0.47 0.46 0.43 0.44
DT12/(DT22+DT32) 0.93 0.91 0.98 0.98 0.99 0.99 0.92 0.96
ET6/CT6*5 1.12 0.69 0.59 0.68 0.69 0.71 1.32 1.09
Table 33
The application also provides an image pickup device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a cellular phone. The image pickup apparatus is equipped with the image pickup lens described above.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (25)

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 and a seventh lens having optical power, characterized in that,
the first lens has negative optical power;
the fourth lens has positive focal power;
the fifth lens has negative focal power;
the seventh lens has negative focal power;
at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical;
the effective focal length fx of the imaging lens in the X-axis direction and the effective focal length fy of the imaging lens in the Y-axis direction meet 0.8 < fx/fy < 1.2;
the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens meet 0.5 < ET6/CT6 x 5 < 1.5; and
the number of lenses having optical power in the imaging lens is seven.
2. The imaging lens according to claim 1, wherein a full field angle FOV of the imaging lens satisfies 150 ° < FOV < 190 °.
3. The imaging lens according to claim 1, wherein an effective focal length fx in an X-axis direction of the imaging lens and an entrance pupil diameter EPDx in the X-axis direction of the imaging lens satisfy fx/EPDx < 2.0; and
The effective focal length fy of the imaging lens in the Y-axis direction and the entrance pupil diameter EPDy of the imaging lens in the Y-axis direction meet the requirement that fy/EPDy is smaller than 2.0.
4. The imaging lens according to claim 1, wherein an effective focal length f7 of the seventh lens and an effective focal length f1 of the first lens satisfy 0.3 < f7/f1 < 1.3.
5. The imaging lens according to claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens satisfy 0.5 < f4/f6 < 1.5.
6. The imaging lens according to claim 1, wherein a radius of curvature R10 of an image side surface of the fifth lens and an effective focal length f5 of the fifth lens satisfy-1 < R10/f5 < 0.
7. The imaging lens according to claim 1, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy 0.2 < (R1-R2)/(r1+r2) < 0.7.
8. The imaging lens system according to claim 1, wherein a radius of curvature R7 of an object-side surface of the fourth lens element, a radius of curvature R8 of an image-side surface of the fourth lens element, a radius of curvature R3 of an object-side surface of the second lens element, and a radius of curvature R4 of an image-side surface of the second lens element satisfy 0.3 < (R7-R8)/(r3+r4) < 1.3.
9. The imaging lens according to claim 1, wherein a separation distance T12 of the first lens and the second lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy 0.8 < T12/(CT 4+ct6+ct 7) < 1.8.
10. The imaging lens according to claim 1, wherein an effective half-caliber DT12 of an image side surface of the first lens, an effective half-caliber DT22 of an image side surface of the second lens, and an effective half-caliber DT32 of an image side surface of the third lens satisfy 0.8 < DT 12/(dt22+dt32) < 1.2.
11. The imaging lens according to any one of claims 1 to 10, further comprising a diaphragm, a distance SL of the diaphragm to an imaging surface of the imaging lens on the optical axis and a distance TTL of a center of an object side surface of the first lens to the imaging surface of the imaging lens on the optical axis satisfying 0.3 < SL/TTL < 0.6.
12. The imaging lens according to any one of claims 1 to 10, wherein an image side surface of the sixth lens is convex.
13. The imaging lens system according to claim 12, wherein the object-side surface of the seventh lens element is concave and the image-side surface is concave.
14. 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 and a seventh lens having optical power, characterized in that,
the first lens has negative optical power;
the fourth lens has positive focal power;
the fifth lens has negative focal power;
the seventh lens has negative focal power;
at least one of the first to seventh lenses has an aspherical surface that is non-rotationally symmetrical;
the full field angle FOV of the camera lens satisfies 150 degrees < FOV < 190 degrees;
the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens meet 0.5 < ET6/CT6 x 5 < 1.5; and
the number of lenses having optical power in the imaging lens is seven.
15. The imaging lens according to claim 14, wherein an effective focal length fx in an X-axis direction of the imaging lens and an entrance pupil diameter EPDx in the X-axis direction of the imaging lens satisfy fx/EPDx < 2.0; and
The effective focal length fy of the imaging lens in the Y-axis direction and the entrance pupil diameter EPDy of the imaging lens in the Y-axis direction meet the requirement that fy/EPDy is smaller than 2.0.
16. The imaging lens according to claim 14, wherein an effective focal length f7 of the seventh lens and an effective focal length f1 of the first lens satisfy 0.3 < f7/f1 < 1.3.
17. The imaging lens according to claim 14, wherein an effective focal length f4 of the fourth lens and an effective focal length f6 of the sixth lens satisfy 0.5 < f4/f6 < 1.5.
18. The imaging lens according to claim 14, wherein a radius of curvature R10 of an image side surface of the fifth lens and an effective focal length f5 of the fifth lens satisfy-1 < R10/f5 < 0.
19. The imaging lens system according to claim 14, wherein a radius of curvature R1 of an object side surface of the first lens and a radius of curvature R2 of an image side surface of the first lens satisfy 0.2 < (R1-R2)/(r1+r2) < 0.7.
20. The imaging lens system according to claim 14, wherein a radius of curvature R7 of an object-side surface of the fourth lens element, a radius of curvature R8 of an image-side surface of the fourth lens element, a radius of curvature R3 of an object-side surface of the second lens element, and a radius of curvature R4 of an image-side surface of the second lens element satisfy 0.3 < (R7-R8)/(r3+r4) < 1.3.
21. The imaging lens according to claim 14, wherein a separation distance T12 of the first lens and the second lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a center thickness CT7 of the seventh lens on the optical axis satisfy 0.8 < T12/(CT 4+ct6+ct 7) < 1.8.
22. The imaging lens according to claim 14, wherein an effective half-caliber DT12 of an image side surface of the first lens, an effective half-caliber DT22 of an image side surface of the second lens, and an effective half-caliber DT32 of an image side surface of the third lens satisfy 0.8 < DT 12/(dt22+dt32) < 1.2.
23. The imaging lens according to any one of claims 14 to 22, further comprising a diaphragm, wherein a distance SL of the diaphragm to an imaging surface of the imaging lens on the optical axis and a distance TTL of a center of an object side surface of the first lens to the imaging surface of the imaging lens on the optical axis satisfy 0.3 < SL/TTL < 0.6.
24. The imaging lens system according to any one of claims 14 to 22, wherein an image side surface of the sixth lens element is convex.
25. The imaging lens system according to claim 24, wherein the seventh lens element has a concave object-side surface and a concave image-side surface.
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