CN109239891B - Optical imaging lens group - Google Patents

Optical imaging lens group Download PDF

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Publication number
CN109239891B
CN109239891B CN201811371910.5A CN201811371910A CN109239891B CN 109239891 B CN109239891 B CN 109239891B CN 201811371910 A CN201811371910 A CN 201811371910A CN 109239891 B CN109239891 B CN 109239891B
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lens
optical imaging
lens group
imaging lens
optical
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CN109239891A (en
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汤禹
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses

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

Abstract

The application discloses an optical imaging lens group, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens has negative focal power; the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the eighth lens has positive optical power. The total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group satisfy f/EPD < 2.

Description

Optical imaging lens group
Technical Field
The present application relates to an optical imaging lens group, and more particularly, to an optical imaging lens group including eight lenses.
Background
In recent years, with the increase of requirements on software and hardware of a mobile phone, an increasing requirement on imaging quality of an imaging lens mounted on the mobile phone is raised. When shooting a distant scene, it is desired to clearly show the specific details of the shot object, so that a lens mounted on the mobile phone is required to have a higher magnification to clearly shoot the distant scene. Therefore, the tele lens is one of the necessary lenses of the smart phone lens adopting the double-shot technology at present.
However, while having a long focal length, it is also desirable that images captured by a mobile phone can blur the background to a greater extent to highlight subject information in a cluttered environment. In addition, the number of lenses adopted by the tele lens is generally large, and how to ensure the imaging quality of the tele lens and simultaneously consider the miniaturization characteristic of the tele lens is one of the current concerns in the field.
Disclosure of Invention
The present application provides an optical imaging lens group, such as an optical imaging lens group having a tele characteristic, applicable to a portable electronic product, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an optical imaging lens group comprising, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The total effective focal length f of the optical imaging lens group and the entrance pupil diameter EPD of the optical imaging lens group can meet f/EPD < 2.
In one embodiment, the total effective focal length f of the optical imaging lens group and the effective focal length f3 of the third lens may satisfy-1 < f3/f < 0.
In one embodiment, the total effective focal length f of the optical imaging lens group and the effective focal length f8 of the eighth lens may satisfy 0 < f/f8 < 1.
In one embodiment, the distance SAG41 on the optical axis from the intersection point of the object side surface of the fourth lens and the optical axis to the vertex of the effective radius of the object side surface of the fourth lens and the distance SAG32 on the optical axis from the intersection point of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens may satisfy-1 < SGA41/SAG32 < 0.
In one embodiment, the radius of curvature R7 of the object-side surface of the fourth lens and the radius of curvature R8 of the image-side surface of the fourth lens may satisfy 0< R7/R8.ltoreq.1.5.
In one embodiment, the total effective focal length f of the optical imaging lens group, the radius of curvature R1 of the object side of the first lens, and the radius of curvature R6 of the image side of the third lens may satisfy 0.5 < |f/R1-f/R6| < 1.
In one embodiment, the center thickness CT3 of the third lens element and the center thickness CT4 of the fourth lens element may satisfy 0.5 < CT3/CT4 < 1.5.
In one embodiment, the separation distance T56 of the fifth lens and the sixth lens on the optical axis and the separation distance T67 of the sixth lens and the seventh lens on the optical axis may satisfy 0< T56/T67 <0.5.
In one embodiment, the combined focal length f123 of the first, second and third lenses and the effective focal length f3 of the third lens may satisfy 0.5 < |f123/f3| <2.
In one embodiment, the maximum half field angle HFOV of the optical imaging lens assembly may satisfy HFOV less than or equal to 30.
In another aspect, the present application also provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The total effective focal length f of the optical imaging lens group and the effective focal length f3 of the third lens can meet the condition that f3/f is smaller than 0 and smaller than-1.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The total effective focal length f of the optical imaging lens group and the effective focal length f8 of the eighth lens can satisfy 0 < f/f8 < 1.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The distance SAG41 between the intersection point of the object side surface of the fourth lens element and the optical axis and the effective radius vertex of the object side surface of the fourth lens element on the optical axis, and the distance SAG32 between the intersection point of the image side surface of the third lens element and the optical axis and the effective radius vertex of the image side surface of the third lens element on the optical axis can satisfy-1 < SGA41/SAG32 < 0.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens can satisfy 0 < R7/R8 less than or equal to 1.5.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The total effective focal length f of the optical imaging lens group, the curvature radius R1 of the object side surface of the first lens and the curvature radius R6 of the image side surface of the third lens can meet the requirement of 0.5 < |f/R1-f/R6| < 1.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The center thickness CT3 of the third lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis can satisfy 0.5 < CT3/CT4 < 1.5.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The interval distance T56 between the fifth lens and the sixth lens on the optical axis and the interval distance T67 between the sixth lens and the seventh lens on the optical axis can satisfy 0 < T56/T67 < 0.5.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. The combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f3 of the third lens can meet 0.5 < |f123/f3| < 2.
In yet another aspect, the present application provides an optical imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens having optical power. Wherein the third lens may have negative optical power; the object side surface of the fourth lens element may be concave, and the image side surface thereof may be convex; the eighth lens may have positive optical power. Wherein the maximum half field angle HFOV of the optical imaging lens assembly may satisfy HFOV less than or equal to 30 degrees.
The application adopts eight lenses, and the optical imaging lens group has at least one beneficial effect of long focus, large aperture, high imaging quality and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing among each lens and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 1 of the present application;
Fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 1;
fig. 3 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 2;
fig. 5 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 3;
fig. 7 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 4 of the present application;
Fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 4;
fig. 9 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 5;
fig. 11 shows a schematic structural view of an optical imaging lens group according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 6;
fig. 13 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 7;
fig. 15 shows a schematic structural view of an optical imaging lens group according to embodiment 8 of the present application;
Fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 8;
Fig. 17 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 9 of the present application;
Fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatic curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 9;
Fig. 19 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 10 of the present application;
fig. 20A to 20D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical imaging lens group of embodiment 10.
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. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the 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 optical imaging lens group according to the exemplary embodiment of the present application may include, for example, eight lenses having optical power, i.e., a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The eight lenses are sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens has positive or negative optical power; the second lens has positive optical power or negative optical power; the third lens may have negative optical power; the fourth lens element with positive or negative focal power has a concave object-side surface and a convex image-side surface; the fifth lens has positive optical power or negative optical power; the sixth lens has positive optical power or negative optical power; the seventh lens has positive optical power or negative optical power; the eighth lens may have positive optical power.
In an exemplary embodiment, the first lens may have positive optical power, with its object-side surface being convex.
In an exemplary embodiment, the object side surface of the second lens may be convex.
In an exemplary embodiment, the image side surface of the third lens may be concave.
In an exemplary embodiment, the sixth lens may have negative optical power.
In an exemplary embodiment, the seventh lens may have negative optical power, an object-side surface thereof may be convex, and an image-side surface thereof may be concave.
In an exemplary embodiment, the object side surface of the eighth lens may be convex.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition f/EPD < 2, where f is the total effective focal length of the optical imaging lens group and EPD is the entrance pupil diameter of the optical imaging lens group. More specifically, f and EPD may further satisfy 1.5 < f/EPD < 2, e.g., 1.69.ltoreq.f/EPD.ltoreq.1.88. The total effective focal length and the entrance pupil diameter of the optical imaging lens group are reasonably controlled, so that the optical system has a larger light-transmitting aperture. The larger the light-transmitting aperture is, the easier the depth of field is to be obtained, and thus the photographed subject can be better highlighted. Meanwhile, the lighting effect can be improved due to the expansion of the light-transmitting aperture, so that imaging noise can be reduced under the condition of darker shooting, and imaging quality can be improved.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression HFOV < 30 DEG, wherein HFOV is the maximum half field angle of the optical imaging lens group. More specifically, HFOV's further may satisfy 23 HFOV 28, such as 24.6 HFOV 25.0. The maximum half field angle of the optical imaging lens group is reasonably controlled, the ratio between the effective focal length of the first lens and the center thickness of the fourth lens is reasonably distributed, the optical system can have long focal length characteristics and better aberration balancing capability, meanwhile, the deflection angle of the main light ray can be reasonably controlled, the matching degree with a chip is improved, and the structure of the optical system is favorably adjusted.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition-1 < f3/f < 0, where f is the total effective focal length of the optical imaging lens group and f3 is the effective focal length of the third lens. More specifically, f3 and f may further satisfy-1 < f3/f < -0.4, for example, -0.87.ltoreq.f3/f.ltoreq.0.59. The effective focal length of the third lens is reasonably set, so that the focal length of the optical system is increased, and the length Jiao Texing of the system is realized; meanwhile, the optical imaging lens group has the function of adjusting the light position, and the total length of the optical imaging lens group is effectively shortened.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0 < f/f8 < 1, where f is the total effective focal length of the optical imaging lens group and f8 is the effective focal length of the eighth lens. More specifically, f and f8 may further satisfy 0.30.ltoreq.f8.ltoreq.0.69. The effective focal length of the eighth lens is reasonably set, so that the optical imaging lens group is beneficial to realizing the characteristic of long focus; meanwhile, the light convergence capacity can be improved, the light focusing position can be adjusted, and the total length of the optical imaging lens group can be shortened.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0 < R7/r8+.1.5, where R7 is a radius of curvature of an object side surface of the fourth lens element and R8 is a radius of curvature of an image side surface of the fourth lens element. More specifically, R7 and R8 may further satisfy 0.66.ltoreq.R7/R8.ltoreq.1.35. The curvature radius of the object side surface and the image side surface of the fourth lens is reasonably controlled, so that the optical power on the object side surface and the image side surface of the fourth lens is reasonably distributed, and the optical imaging lens group has better chromatic aberration and distortion balancing capability.
In an exemplary embodiment, the optical imaging lens assembly of the present application may satisfy the conditional expression 0.5 < CT3/CT4 < 1.5, wherein CT3 is a central thickness of the third lens element on the optical axis, and CT4 is a central thickness of the fourth lens element on the optical axis. More specifically, CT3 and CT4 may further satisfy 0.7.ltoreq.CT3/CT 4.ltoreq.1.2, for example 0.96.ltoreq.CT3/CT 4.ltoreq.1.00. The ratio of the center thickness of the third lens on the optical axis to the center thickness of the fourth lens on the optical axis is reasonably controlled, so that enough space is reserved between the lenses, the degree of freedom of the change of the lens surface is higher, and the capability of correcting astigmatism and field curvature of the optical imaging lens group is improved.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.5 < |f/R1-f/r6| < 1, where f is the total effective focal length of the optical imaging lens group, R1 is the radius of curvature of the object side surface of the first lens, and R6 is the radius of curvature of the image side surface of the third lens. More specifically, f, R1 and R6 may further satisfy 0.68.ltoreq.f/R1-f/R6.ltoreq.0.96. The curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the third lens are reasonably controlled, so that the optical imaging lens group has better capability of balancing chromatic aberration and distortion.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0 < T56/T67 < 0.5, where T56 is a separation distance of the fifth lens and the sixth lens on the optical axis, and T67 is a separation distance of the sixth lens and the seventh lens on the optical axis. More specifically, T56 and T67 may further satisfy 0 < T56/T67 < 0.3, e.g., 0.14.ltoreq.T56/T67.ltoreq.0.22. The ratio of T56 to T67 is reasonably controlled, so that the processability of the lens can be effectively improved, the rear end size of the optical imaging lens group can be effectively reduced, and the overlarge volume of the optical imaging lens group is avoided.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the condition that-1 < SGA41/SAG32 < 0, wherein SAG41 is a distance on the optical axis between an intersection point of the object side surface of the fourth lens and the optical axis and an effective radius vertex of the object side surface of the fourth lens, and SAG32 is a distance on the optical axis between an intersection point of the image side surface of the third lens and the optical axis and an effective radius vertex of the image side surface of the third lens. More specifically, SGA41 and SAG32 may further satisfy-0.7 < SGA41/SAG32 < -0.2, e.g., -0.56. Ltoreq.SGA 41/SAG 32. Ltoreq.0.33. The ratio of SGA41 to SAG32 is reasonably controlled, the angle of the principal ray of the optical imaging lens group can be better adjusted, the relative brightness of the optical imaging lens group is effectively improved, and the image surface definition is improved.
In an exemplary embodiment, the optical imaging lens group of the present application may satisfy the conditional expression 0.5 < |f123/f3| < 2, where f123 is a combined focal length of the first lens, the second lens, and the third lens, and f3 is an effective focal length of the third lens. More specifically, f123 and f3 may further satisfy 0.6.ltoreq.f123/f3.ltoreq.1.6, for example 0.88.ltoreq.f123/f3.ltoreq.1.47. The ratio of the combined focal length of the first lens, the second lens and the third lens to the effective focal length of the third lens is reasonably controlled, and the characteristic of long focus can be realized while aberration is corrected; meanwhile, the degree of freedom of the change of the lens surface is higher, so that the capability of correcting astigmatism and field curvature of the optical imaging lens group is improved.
In an exemplary embodiment, the optical imaging lens group may further include at least one diaphragm to improve imaging quality of the optical imaging lens group. Optionally, a stop may be provided between the third lens and the fourth lens.
Optionally, the optical imaging lens group 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 optical imaging lens group according to the above embodiment of the present application may employ a plurality of lenses, for example, eight lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, the volume of the optical imaging lens group can be effectively reduced, the sensitivity of the optical imaging lens group can be reduced, and the processability of the optical imaging lens group can be improved, so that the optical imaging lens group is more beneficial to production and processing and can be suitable for portable electronic products. The optical imaging lens group configured as described above can also have the beneficial effects of long focus, large light flux, high imaging quality, and the like.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens is an aspherical surface. 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. Alternatively, each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses may be aspherical in object side and image side.
However, those skilled in the art will appreciate that the number of lenses making up an optical imaging lens group may be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although eight lenses are described as an example in the embodiment, the optical imaging lens group is not limited to include eight lenses. The optical imaging lens group may also include other numbers of lenses, if desired.
Specific examples of the optical imaging lens group applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 1 of the present application.
As shown in fig. 1, an optical imaging lens group according to an 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has 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 convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 1 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 1, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 1
As can be seen from table 1, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A 4、A6、A8、A10、A12、A14、A16、A18 and A 20 that can be used for each of the aspherical mirrors S1-S16 in example 1.
TABLE 2
Table 3 gives half of the diagonal length ImgH of the effective pixel region on the imaging surface S19 of the optical imaging lens group in embodiment 1, the total optical length TTL (i.e., the distance on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S19), the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses.
ImgH(mm) 2.75 f3(mm) -4.63
TTL(mm) 5.90 f4(mm) -23.59
HFOV(°) 24.7 f5(mm) 14.82
Fno 1.69 f6(mm) -17.85
f(mm) 6.01 f7(mm) -5.16
f1(mm) 3.38 f8(mm) 10.32
f2(mm) 22.20
TABLE 3 Table 3
The optical imaging lens group in embodiment 1 satisfies:
f/EPD = 1.69, where f is the total effective focal length of the optical imaging lens group, EPD is the entrance pupil diameter of the optical imaging lens group;
f3/f= -0.77, where f is the total effective focal length of the optical imaging lens group and f3 is the effective focal length of the third lens E3;
ff8=0.58, where f is the total effective focal length of the optical imaging lens group and f8 is the effective focal length of the eighth lens E8;
R7/r8=0.78, where R7 is the radius of curvature of the object-side surface S7 of the fourth lens element E4, and R8 is the radius of curvature of the image-side surface S8 of the fourth lens element E4;
CT3/CT4 = 1.00, wherein CT3 is the center thickness of the third lens element E3 on the optical axis, and CT4 is the center thickness of the fourth lens element E4 on the optical axis;
I f/R1-f/r6|=0.87, wherein f is the total effective focal length of the optical imaging lens group, R1 is the radius of curvature of the object-side surface S1 of the first lens element E1, and R6 is the radius of curvature of the image-side surface S6 of the third lens element E3;
T56/t67=0.16, where T56 is the distance between the fifth lens E5 and the sixth lens E6 on the optical axis, and T67 is the distance between the sixth lens E6 and the seventh lens E7 on the optical axis;
SGA 41/sag32= -0.33, where SAG41 is the distance on the optical axis between the intersection point of the object side surface S7 of the fourth lens element E4 and the optical axis and the vertex of the effective radius of the object side surface S7 of the fourth lens element E4, and SAG32 is the distance on the optical axis between the intersection point of the image side surface S6 of the third lens element E3 and the optical axis and the vertex of the effective radius of the image side surface S6 of the third lens element E3;
i f123/f3|=1.03, where f123 is the combined focal length of the first lens E1, the second lens E2, and the third lens E3, and f3 is the effective focal length of the third lens E3.
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 1, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 2B shows an astigmatism curve of the optical imaging lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows distortion curves of the optical imaging lens group of embodiment 1, which represent distortion magnitude values corresponding to different image heights. Fig. 2D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 2A to 2D, the optical imaging lens set provided in embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 2 of the present application.
As shown in fig. 3, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 4 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 2, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 4 Table 4
As can be seen from table 4, in embodiment 2, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 5 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -8.4862E-04 -2.1335E-02 4.6509E-02 -6.1464E-02 4.8686E-02 -2.4007E-02 7.1601E-03 -1.1877E-03 8.2907E-05
S2 4.8163E-02 1.6926E-02 -1.0134E-01 1.3433E-01 -9.9180E-02 4.4479E-02 -1.1996E-02 1.7844E-03 -1.1232E-04
S3 5.3232E-02 3.9397E-02 -1.4578E-01 1.5965E-01 -8.2690E-02 9.3317E-03 1.1040E-02 -5.1876E-03 7.1173E-04
S4 1.4565E-02 1.2483E-02 -1.2779E-01 2.4477E-01 -2.6166E-01 1.7136E-01 -6.6968E-02 1.4105E-02 -1.1993E-03
S5 6.8926E-02 -1.1281E-01 1.8358E-01 -1.6231E-01 1.9432E-02 1.2055E-01 -1.2821E-01 5.5006E-02 -8.8218E-03
S6 7.9969E-02 -5.7746E-02 1.6173E-01 -1.2534E-01 6.1284E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -1.4940E-01 4.4148E-01 -6.1324E-01 -6.1490E-02 2.7220E+00 -6.3966E+00 7.2138E+00 -4.1016E+00 9.3191E-01
S8 -1.6768E-02 4.2871E-01 -2.3118E+00 7.6975E+00 -1.4738E+01 1.6815E+01 -1.1247E+01 4.0445E+00 -6.0224E-01
S9 1.9257E-03 -3.5563E-03 -1.5216E+00 6.2847E+00 -1.2060E+01 1.3432E+01 -8.7783E+00 3.1084E+00 -4.6072E-01
S10 2.6238E-01 -1.0778E+00 1.0262E+00 2.0061E+00 -7.0163E+00 9.8166E+00 -7.6769E+00 3.2434E+00 -5.7351E-01
S11 3.5999E-01 -1.4852E+00 2.4908E+00 -2.1634E+00 1.0972E+00 -3.4013E-01 6.3879E-02 -6.7112E-03 3.0394E-04
S12 8.5754E-02 -5.2435E-01 8.7572E-01 -8.6500E-01 5.9128E-01 -2.7217E-01 7.6750E-02 -1.1718E-02 7.3663E-04
S13 -8.8824E-02 -1.7324E-01 3.5274E-01 -5.0401E-01 4.9128E-01 -2.9391E-01 1.0318E-01 -1.9472E-02 1.5216E-03
S14 -1.4827E-01 1.2633E-02 1.3799E-02 -1.0528E-02 5.3115E-03 -2.4609E-03 8.6525E-04 -1.8062E-04 1.5858E-05
S15 -1.1046E-01 7.3176E-02 -7.7599E-02 8.0137E-02 -5.4218E-02 2.2117E-02 -5.3069E-03 6.9138E-04 -3.7689E-05
S16 -9.9511E-02 4.9851E-02 -4.1617E-02 3.2621E-02 -1.5378E-02 4.0508E-03 -5.6678E-04 3.4694E-05 -2.9251E-07
TABLE 5
Table 6 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in embodiment 2.
TABLE 6
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 4B shows an astigmatism curve of the optical imaging lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical imaging lens group of embodiment 2, which represents distortion magnitude values corresponding to different image heights. Fig. 4D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 4A to 4D, the optical imaging lens group provided in embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 3 of the present application.
As shown in fig. 5, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative 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 concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 7 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 3, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 7
As can be seen from table 7, in example 3, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 8
Table 9 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in embodiment 3.
ImgH(mm) 2.75 f3(mm) -3.76
TTL(mm) 5.75 f4(mm) 37.90
HFOV(°) 24.7 f5(mm) 29.77
Fno 1.88 f6(mm) -12.67
f(mm) 6.00 f7(mm) -6.81
f1(mm) 3.43 f8(mm) 14.16
f2(mm) 13.81
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 3, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 6B shows an astigmatism curve of the optical imaging lens group of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical imaging lens group of embodiment 3, which represents distortion magnitude values corresponding to different image heights. Fig. 6D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 6A to 6D, the optical imaging lens group provided in embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 4 of the present application.
As shown in fig. 7, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave 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 convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 10 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 4, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Table 10
As can be seen from table 10, in example 4, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 11 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -9.7290E-04 -2.3817E-02 5.9926E-02 -8.8582E-02 7.7562E-02 -4.1894E-02 1.3605E-02 -2.4529E-03 1.8732E-04
S2 5.1163E-02 2.8588E-02 -1.4844E-01 2.1402E-01 -1.7543E-01 8.7496E-02 -2.6108E-02 4.2690E-03 -2.9378E-04
S3 6.7286E-02 2.6494E-02 -1.5407E-01 2.0848E-01 -1.4619E-01 4.7899E-02 6.5789E-05 -4.1650E-03 7.6968E-04
S4 2.4017E-02 -1.7655E-02 -5.4467E-02 1.4554E-01 -1.8399E-01 1.3874E-01 -6.1565E-02 1.4629E-02 -1.4144E-03
S5 7.9582E-02 -1.4410E-01 3.1947E-01 -5.4240E-01 6.8007E-01 -5.7561E-01 3.0609E-01 -9.2203E-02 1.2098E-02
S6 7.9969E-02 -5.7746E-02 1.6173E-01 -1.2534E-01 6.1284E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -7.6703E-02 -1.0464E-02 1.2271E+00 -6.7549E+00 1.9260E+01 -3.2506E+01 3.2128E+01 -1.7077E+01 3.7387E+00
S8 -1.5515E-03 3.3799E-01 -2.5943E+00 9.4327E+00 -1.9465E+01 2.4020E+01 -1.7754E+01 7.4037E+00 -1.3745E+00
S9 6.1686E-02 -3.1179E-01 -1.2564E+00 8.1705E+00 -1.8640E+01 2.3294E+01 -1.6763E+01 6.5321E+00 -1.0748E+00
S10 2.5708E-01 -1.1317E+00 1.4974E+00 9.7625E-01 -5.8440E+00 9.2388E+00 -7.8732E+00 3.6119E+00 -6.9578E-01
S11 2.9092E-01 -1.1874E+00 2.0058E+00 -1.7364E+00 8.6519E-01 -2.5964E-01 4.6513E-02 -4.5949E-03 1.9309E-04
S12 5.8634E-02 -4.5212E-01 7.9063E-01 -7.7398E-01 5.1742E-01 -2.3815E-01 6.8810E-02 -1.0910E-02 7.1597E-04
S13 -6.8043E-02 -1.5602E-01 2.6216E-01 -3.1318E-01 2.6308E-01 -1.3812E-01 4.2847E-02 -7.1649E-03 4.9692E-04
S14 -1.8166E-01 2.1710E-02 3.0016E-02 -4.0777E-02 2.4581E-02 -8.8396E-03 2.2651E-03 -4.3086E-04 4.1432E-05
S15 -1.4182E-01 9.8609E-02 -1.1087E-01 1.3556E-01 -1.1160E-01 5.5075E-02 -1.5815E-02 2.4402E-03 -1.5620E-04
S16 -1.5055E-01 1.0726E-01 -1.1210E-01 9.7845E-02 -5.3777E-02 1.7830E-02 -3.4968E-03 3.7405E-04 -1.6724E-05
TABLE 11
Table 12 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in embodiment 4.
Table 12
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 8B shows an astigmatism curve of the optical imaging lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the optical imaging lens group of embodiment 4, which represents distortion magnitude values corresponding to different image heights. Fig. 8D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 8A to 8D, the optical imaging lens group provided in embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 5 of the present application.
As shown in fig. 9, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative 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 concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 13 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 5, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 13
As can be seen from table 13, in example 5, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 14
Table 15 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in embodiment 5.
ImgH(mm) 2.75 f3(mm) -3.86
TTL(mm) 5.80 f4(mm) 44.24
HFOV(°) 24.7 f5(mm) 29.91
Fno 1.86 f6(mm) -12.84
f(mm) 5.99 f7(mm) -6.82
f1(mm) 3.43 f8(mm) 13.01
f2(mm) 14.29
TABLE 15
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 5, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 10B shows an astigmatism curve of the optical imaging lens group of embodiment 5, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the optical imaging lens group of embodiment 5, which represents distortion magnitude values corresponding to different image heights. Fig. 10D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 10A to 10D, the optical imaging lens group provided in embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 6 of the present application.
As shown in fig. 11, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. 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 concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 16 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging lens group of example 6, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 16
As can be seen from table 16, in example 6, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 17 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -6.3981E-04 -2.7410E-02 7.0847E-02 -1.0689E-01 9.5420E-02 -5.2397E-02 1.7249E-02 -3.1400E-03 2.4162E-04
S2 5.2865E-02 3.4135E-02 -1.7279E-01 2.5771E-01 -2.1935E-01 1.1359E-01 -3.5154E-02 5.9524E-03 -4.2339E-04
S3 7.3617E-02 3.9861E-03 -1.0088E-01 1.2425E-01 -5.6472E-02 -1.4853E-02 2.7710E-02 -1.1074E-02 1.5092E-03
S4 2.4321E-02 -1.8024E-02 -6.7157E-02 1.8660E-01 -2.3956E-01 1.8023E-01 -7.9087E-02 1.8446E-02 -1.7324E-03
S5 8.2088E-02 -1.8281E-01 4.9433E-01 -9.8215E-01 1.3747E+00 -1.2673E+00 7.2697E-01 -2.3514E-01 3.2912E-02
S6 7.9969E-02 -5.7746E-02 1.6173E-01 -1.2534E-01 6.1284E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -6.0079E-02 -3.1302E-01 3.5396E+00 -1.6758E+01 4.6166E+01 -7.8005E+01 7.9088E+01 -4.4049E+01 1.0327E+01
S8 -3.4833E-02 4.6419E-01 -2.9853E+00 1.0821E+01 -2.2544E+01 2.7852E+01 -2.0204E+01 8.0051E+00 -1.3564E+00
S9 3.0993E-02 -2.3045E-01 -1.4079E+00 8.8491E+00 -2.0712E+01 2.6690E+01 -1.9814E+01 7.9541E+00 -1.3443E+00
S10 2.5357E-01 -1.1246E+00 1.3730E+00 1.4003E+00 -6.6634E+00 1.0187E+01 -8.5113E+00 3.8409E+00 -7.2976E-01
S11 3.1510E-01 -1.2363E+00 1.9813E+00 -1.6214E+00 7.5169E-01 -2.0373E-01 3.1383E-02 -2.4499E-03 6.8526E-05
S12 8.5042E-02 -5.0696E-01 8.1360E-01 -7.4460E-01 4.7357E-01 -2.1176E-01 6.0294E-02 -9.4790E-03 6.1810E-04
S13 -6.9175E-02 -1.6198E-01 2.7360E-01 -3.2994E-01 2.8016E-01 -1.4866E-01 4.6587E-02 -7.8641E-03 5.5014E-04
S14 -1.8194E-01 1.8327E-02 3.4213E-02 -4.1081E-02 2.3256E-02 -8.1299E-03 2.0889E-03 -4.0208E-04 3.8691E-05
S15 -1.3156E-01 9.4917E-02 -1.1087E-01 1.3350E-01 -1.0862E-01 5.3410E-02 -1.5328E-02 2.3643E-03 -1.5116E-04
S16 -1.4526E-01 1.0254E-01 -1.0345E-01 8.3551E-02 -4.2533E-02 1.3013E-02 -2.3125E-03 2.1538E-04 -7.7035E-06
TABLE 17
Table 18 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in embodiment 6.
TABLE 18
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 6, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 12B shows an astigmatism curve of the optical imaging lens group of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging lens group of embodiment 6, which represents distortion magnitude values corresponding to different image heights. Fig. 12D shows a chromatic aberration of magnification curve of the optical imaging lens group of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 12A to 12D, the optical imaging lens group provided in embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 7 of the present application.
As shown in fig. 13, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, and its object-side surface S15 is convex and its image-side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 19 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 7, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 19
As can be seen from table 19, in example 7, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 20 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Table 20
Table 21 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in example 7.
ImgH(mm) 2.75 f3(mm) -3.84
TTL(mm) 5.70 f4(mm) 51.29
HFOV(°) 25.0 f5(mm) 34.35
Fno 1.86 f6(mm) -14.41
f(mm) 5.95 f7(mm) -7.08
f1(mm) 3.42 f8(mm) 19.50
f2(mm) 13.21
Table 21
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 7, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 14B shows an astigmatism curve of the optical imaging lens group of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the optical imaging lens group of embodiment 7, which represents distortion magnitude values corresponding to different image heights. Fig. 14D shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 14A to 14D, the optical imaging lens group provided in embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging lens group according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic structural view of an optical imaging lens group according to embodiment 8 of the present application.
As shown in fig. 15, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative 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 concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 22 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging lens group of example 8, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 22
As can be seen from table 22, in example 8, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 23 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.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -3.9125E-04 -2.6398E-02 6.5286E-02 -9.6403E-02 8.4876E-02 -4.6134E-02 1.5036E-02 -2.7059E-03 2.0505E-04
S2 5.3111E-02 3.4317E-02 -1.7510E-01 2.6230E-01 -2.2422E-01 1.1664E-01 -3.6289E-02 6.1850E-03 -4.4372E-04
S3 7.3564E-02 3.9583E-03 -8.9431E-02 8.8770E-02 -2.5824E-03 -6.1835E-02 5.1561E-02 -1.7620E-02 2.2596E-03
S4 1.6827E-02 1.9273E-02 -1.7608E-01 3.8150E-01 -4.6176E-01 3.4053E-01 -1.4923E-01 3.5280E-02 -3.4137E-03
S5 7.7297E-02 -1.6929E-01 4.6951E-01 -9.8260E-01 1.4441E+00 -1.3840E+00 8.1871E-01 -2.7161E-01 3.8845E-02
S6 7.9969E-02 -5.7746E-02 1.6173E-01 -1.2534E-01 6.1284E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -4.5745E-02 -4.0678E-01 4.0126E+00 -1.8685E+01 5.1561E+01 -8.7519E+01 8.9295E+01 -5.0165E+01 1.1895E+01
S8 -6.7237E-02 8.2068E-01 -4.9723E+00 1.7162E+01 -3.5315E+01 4.4579E+01 -3.3950E+01 1.4360E+01 -2.6018E+00
S9 4.1104E-03 1.1829E-01 -2.8813E+00 1.2096E+01 -2.5138E+01 3.0683E+01 -2.2277E+01 8.9235E+00 -1.5226E+00
S10 2.4389E-01 -1.0451E+00 1.2909E+00 9.9893E-01 -5.1369E+00 7.6558E+00 -6.1678E+00 2.6712E+00 -4.8479E-01
S11 2.2609E-01 -1.0032E+00 1.6565E+00 -1.3777E+00 6.4962E-01 -1.8063E-01 2.9112E-02 -2.4803E-03 8.4232E-05
S12 2.3408E-02 -3.2135E-01 5.4403E-01 -5.0923E-01 3.3273E-01 -1.5100E-01 4.2760E-02 -6.5902E-03 4.1800E-04
S13 -6.4824E-02 -2.0354E-01 3.9396E-01 -5.2716E-01 4.7521E-01 -2.6654E-01 8.9006E-02 -1.6188E-02 1.2344E-03
S14 -1.8091E-01 2.1806E-02 2.9377E-02 -3.6147E-02 1.9922E-02 -6.6432E-03 1.6649E-03 -3.3099E-04 3.3401E-05
S15 -1.2231E-01 8.5729E-02 -9.8192E-02 1.1577E-01 -9.1718E-02 4.3843E-02 -1.2234E-02 1.8361E-03 -1.1433E-04
S16 -1.3365E-01 9.3159E-02 -9.5366E-02 7.6848E-02 -3.8606E-02 1.1689E-02 -2.0864E-03 2.0144E-04 -7.9772E-06
Table 23
Table 24 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in example 8.
ImgH(mm) 2.75 f3(mm) -3.82
TTL(mm) 5.70 f4(mm) 55.63
HFOV(°) 25.0 f5(mm) 73.65
Fno 1.86 f6(mm) -20.20
f(mm) 5.95 f7(mm) -7.02
f1(mm) 3.43 f8(mm) 16.66
f2(mm) 14.03
Table 24
Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 8, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 16B shows an astigmatism curve of the optical imaging lens group of embodiment 8, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 16C shows a distortion curve of the optical imaging lens group of embodiment 8, which represents distortion magnitude values corresponding to different image heights. Fig. 16D shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 8, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 16A to 16D, the optical imaging lens group provided in embodiment 8 can achieve good imaging quality.
Example 9
An optical imaging lens group according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 9 of the present application.
As shown in fig. 17, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative 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 concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, wherein an object-side surface S15 thereof is convex, and an image-side surface S16 thereof is convex. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 25 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the optical imaging lens group of example 9, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Table 25
As is clear from table 25, in example 9, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 26 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 9, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.9773E-03 -1.7742E-02 4.6131E-02 -7.1245E-02 6.4519E-02 -3.5869E-02 1.1921E-02 -2.1898E-03 1.6956E-04
S2 5.2635E-02 3.3707E-02 -1.7136E-01 2.5529E-01 -2.1704E-01 1.1230E-01 -3.4761E-02 5.8991E-03 -4.2190E-04
S3 6.5613E-02 4.5108E-02 -2.1758E-01 3.1934E-01 -2.5980E-01 1.1890E-01 -2.6393E-02 1.2192E-03 3.0976E-04
S4 2.1510E-02 3.4122E-04 -1.1673E-01 2.6484E-01 -3.2052E-01 2.3448E-01 -1.0170E-01 2.3817E-02 -2.2935E-03
S5 7.2336E-02 -9.7367E-02 1.2300E-01 -4.5462E-02 -9.4284E-02 1.7717E-01 -1.3853E-01 5.3601E-02 -8.2176E-03
S6 7.9969E-02 -5.7746E-02 1.6173E-01 -1.2534E-01 6.1284E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -9.3343E-02 1.6712E-01 -6.0636E-02 -1.0424E+00 4.2651E+00 -8.4457E+00 9.0515E+00 -4.9597E+00 1.0638E+00
S8 -3.3561E-02 3.4168E-01 -2.2596E+00 8.3607E+00 -1.7323E+01 2.0978E+01 -1.4766E+01 5.6344E+00 -9.1715E-01
S9 2.0994E-02 -2.0036E-01 -1.3970E+00 8.4013E+00 -1.9269E+01 2.4379E+01 -1.7744E+01 6.9698E+00 -1.1501E+00
S10 2.5158E-01 -1.1285E+00 1.4163E+00 1.2152E+00 -6.2277E+00 9.5759E+00 -7.9962E+00 3.5977E+00 -6.8008E-01
S11 3.1184E-01 -1.2506E+00 2.0427E+00 -1.7039E+00 8.1270E-01 -2.3088E-01 3.8524E-02 -3.4644E-03 1.2828E-04
S12 9.5388E-02 -5.0990E-01 8.1262E-01 -7.6495E-01 5.1394E-01 -2.4227E-01 7.1554E-02 -1.1519E-02 7.6348E-04
S13 -7.2056E-02 -1.7064E-01 2.9489E-01 -3.6330E-01 3.1482E-01 -1.7004E-01 5.4084E-02 -9.2336E-03 6.5027E-04
S14 -1.8073E-01 1.5620E-02 3.3091E-02 -3.7058E-02 2.1357E-02 -8.3354E-03 2.4831E-03 -5.1118E-04 4.8581E-05
S15 -1.1319E-01 7.8895E-02 -9.0691E-02 1.0605E-01 -8.3471E-02 3.9780E-02 -1.1077E-02 1.6584E-03 -1.0297E-04
S16 -1.0507E-01 5.3108E-02 -4.0821E-02 2.8798E-02 -1.2432E-02 2.9466E-03 -3.3949E-04 1.0311E-05 7.4362E-07
Table 26
Table 27 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in embodiment 9.
ImgH(mm) 2.75 f3(mm) -4.14
TTL(mm) 5.86 f4(mm) 153.15
HFOV(°) 24.8 f5(mm) 25.91
Fno 1.86 f6(mm) -21.65
f(mm) 5.95 f7(mm) -6.39
f1(mm) 3.42 f8(mm) 17.09
f2(mm) 16.19
Table 27
Fig. 18A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 9, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 18B shows an astigmatism curve of the optical imaging lens group of embodiment 9, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 18C shows a distortion curve of the optical imaging lens group of embodiment 9, which represents distortion magnitude values corresponding to different image heights. Fig. 18D shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 9, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 18A to 18D, the optical imaging lens group provided in embodiment 9 can achieve good imaging quality.
Example 10
An optical imaging lens group according to embodiment 10 of the present application is described below with reference to fig. 19 to 20D. Fig. 19 shows a schematic configuration diagram of an optical imaging lens group according to embodiment 10 of the present application.
As shown in fig. 19, the optical imaging lens group 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 stop STO, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the eighth lens E8, the filter E9, and the imaging surface S19.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative 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 concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is concave and an image-side surface S10 thereof is convex. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave, and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens element E8 has positive refractive power, and its object-side surface S15 is convex and its image-side surface S16 is concave. The filter E9 has an object side surface S17 and an image side surface S18. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 28 shows the surface types, radii of curvature, thicknesses, materials, and cone coefficients of the respective lenses of the optical imaging lens group of example 10, wherein the radii of curvature and thicknesses are each in millimeters (mm).
Table 28
As can be seen from table 28, in embodiment 10, the object side surface and the image side surface of any one of the first lens element E1 to the eighth lens element E8 are aspherical surfaces. Table 29 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 10, where each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -9.2958E-04 -2.5227E-02 6.5155E-02 -9.9049E-02 8.8879E-02 -4.8921E-02 1.6091E-02 -2.9173E-03 2.2272E-04
S2 5.3190E-02 3.4587E-02 -1.7626E-01 2.6443E-01 -2.2653E-01 1.1814E-01 -3.6854E-02 6.2981E-03 -4.5293E-04
S3 6.8630E-02 3.5405E-02 -1.9019E-01 2.7549E-01 -2.1392E-01 8.6638E-02 -1.1651E-02 -2.6781E-03 7.5383E-04
S4 2.3203E-02 -1.5194E-02 -7.2351E-02 1.9069E-01 -2.4445E-01 1.8752E-01 -8.4639E-02 2.0381E-02 -1.9832E-03
S5 7.1653E-02 -1.1472E-01 1.8624E-01 -1.8172E-01 8.9897E-02 2.5161E-02 -6.4502E-02 3.4194E-02 -6.0965E-03
S6 7.9969E-02 -5.7746E-02 1.6173E-01 -1.2534E-01 6.1284E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -9.4202E-02 1.9968E-01 -2.4202E-01 -2.7512E-01 1.7509E+00 -3.2831E+00 2.7219E+00 -7.2203E-01 -1.3245E-01
S8 -3.4309E-02 3.6994E-01 -2.3565E+00 8.7656E+00 -1.8543E+01 2.3068E+01 -1.6797E+01 6.6961E+00 -1.1524E+00
S9 3.0246E-02 -2.2323E-01 -1.4617E+00 9.0474E+00 -2.1156E+01 2.7297E+01 -2.0299E+01 8.1613E+00 -1.3808E+00
S10 2.5612E-01 -1.1275E+00 1.3785E+00 1.3846E+00 -6.6243E+00 1.0131E+01 -8.4694E+00 3.8246E+00 -7.2702E-01
S11 2.9093E-01 -1.2131E+00 2.0120E+00 -1.6960E+00 8.1643E-01 -2.3400E-01 3.9388E-02 -3.5730E-03 1.3345E-04
S12 6.8286E-02 -5.1024E-01 8.8524E-01 -8.8066E-01 6.0146E-01 -2.7970E-01 8.0858E-02 -1.2778E-02 8.3558E-04
S13 -6.8590E-02 -1.6100E-01 2.7133E-01 -3.2657E-01 2.7678E-01 -1.4661E-01 4.5864E-02 -7.7299E-03 5.3997E-04
S14 -1.8349E-01 1.8839E-02 3.4827E-02 -4.2205E-02 2.3975E-02 -8.3778E-03 2.1480E-03 -4.1354E-04 3.9884E-05
S15 -1.2631E-01 9.0034E-02 -1.0411E-01 1.2347E-01 -9.8877E-02 4.7840E-02 -1.3511E-02 2.0513E-03 -1.2913E-04
S16 -1.2744E-01 8.4186E-02 -8.7374E-02 7.5481E-02 -4.1292E-02 1.3734E-02 -2.7196E-03 2.9496E-04 -1.3405E-05
Table 29
Table 30 shows half of the diagonal length ImgH, the total optical length TTL, the maximum half field angle HFOV, the f-number Fno, the total effective focal length f of the optical imaging lens group, and the effective focal lengths f1 to f8 of the respective lenses on the imaging surface S19 of the optical imaging lens group in embodiment 10.
ImgH(mm) 2.75 f3(mm) -3.86
TTL(mm) 5.81 f4(mm) 38.84
HFOV(°) 24.7 f5(mm) 32.41
Fno 1.86 f6(mm) -12.37
f(mm) 5.99 f7(mm) -6.79
f1(mm) 3.43 f8(mm) 12.96
f2(mm) 14.35
Table 30
Fig. 20A shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 10, which indicates a convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens group. Fig. 20B shows an astigmatism curve of the optical imaging lens group of embodiment 10, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 20C shows a distortion curve of the optical imaging lens group of embodiment 10, which represents distortion magnitude values corresponding to different image heights. Fig. 20D shows a magnification chromatic aberration curve of the optical imaging lens group of embodiment 10, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens group. As can be seen from fig. 20A to 20D, the optical imaging lens group provided in embodiment 10 can achieve good imaging quality.
In summary, examples 1 to 10 satisfy the relationships shown in table 31, respectively.
Table 31
The application also provides an imaging 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 device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described optical imaging lens group.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (9)

1. The optical imaging lens assembly sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens having optical power, characterized in that,
The first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the object side surface of the second lens is a convex surface;
the third lens has negative focal power, and the image side surface of the third lens is a concave surface;
the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface;
the object side surface of the fifth lens is a concave surface, and the image side surface is a convex surface;
the sixth lens has negative focal power;
the seventh lens is provided with negative focal power, the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface;
the eighth lens has positive focal power, and the object side surface of the eighth lens is a convex surface; and
The total effective focal length f of the optical imaging lens group and the effective focal length f3 of the third lens meet-1 < f3/f < 0;
The combined focal length f123 of the first lens, the second lens and the third lens and the effective focal length f3 of the third lens meet 0.5 < |f123/f3| < 2;
The number of lenses having optical power in the optical imaging lens group is eight.
2. The optical imaging lens group according to claim 1, wherein a total effective focal length f of the optical imaging lens group and an effective focal length f8 of the eighth lens satisfy 0 < f/f8 < 1.
3. The optical imaging lens group according to claim 1, wherein a distance SAG41 on the optical axis from an intersection point of the object side surface of the fourth lens and the optical axis to an effective radius vertex of the object side surface of the fourth lens and a distance SAG32 on the optical axis from an intersection point of the image side surface of the third lens and the optical axis to an effective radius vertex of the image side surface of the third lens satisfy-1 < SGA41/SAG32 < 0.
4. The optical imaging lens group according to claim 1, wherein a radius of curvature R7 of an object side surface of the fourth lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy 0 < R7/R8.ltoreq.1.5.
5. The optical imaging lens group according to claim 1, wherein a total effective focal length f of the optical imaging lens group, a radius of curvature R1 of an object side surface of the first lens, and a radius of curvature R6 of an image side surface of the third lens satisfy 0.5 < |f/R1-f/R6| < 1.
6. The optical imaging lens assembly of claim 1, wherein a center thickness CT3 of the third lens element on the optical axis and a center thickness CT4 of the fourth lens element on the optical axis satisfy 0.5 < CT3/CT4 < 1.5.
7. The optical imaging lens group according to claim 1, wherein a separation distance T56 of the fifth lens and the sixth lens on the optical axis and a separation distance T67 of the sixth lens and the seventh lens on the optical axis satisfy 0 < T56/T67 < 0.5.
8. The optical imaging lens group of any of claims 1 to 7, wherein a maximum half field angle HFOV of the optical imaging lens group satisfies 23 ° -HFOV ∈30 °.
9. The optical imaging lens group of any of claims 1 to 7, wherein a total effective focal length f of the optical imaging lens group and an entrance pupil diameter EPD of the optical imaging lens group satisfy 1.5 < f/EPD <2.
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