CN112748543A - Optical imaging lens group - Google Patents

Optical imaging lens group Download PDF

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Publication number
CN112748543A
CN112748543A CN202110073703.7A CN202110073703A CN112748543A CN 112748543 A CN112748543 A CN 112748543A CN 202110073703 A CN202110073703 A CN 202110073703A CN 112748543 A CN112748543 A CN 112748543A
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lens
optical imaging
lens group
image
optical
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CN112748543B (en
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姚嘉诚
吕赛锋
戴付建
赵烈烽
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/08—Anamorphotic objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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

Abstract

The invention 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 having a positive optical power; the image side surface of the second lens is a concave surface; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens having a positive optical power; a fifth lens having a refractive power, an object side surface of which is concave; a sixth lens having a refractive power, an image-side surface of which is concave; and a seventh lens having optical power; wherein, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy: TTL/ImgH < 1.5; the maximum field angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group meet the following conditional expression: tan (FOV/2). times.f >5.5 mm. According to the optical imaging lens group, the curvature is increased by adjusting the shape of the first lens, four internal reflection ghost images are eliminated, the rest ghost images are weakened, and the overall imaging quality is effectively improved.

Description

Optical imaging lens group
Technical Field
The invention belongs to the field of optical imaging, and particularly relates to an optical imaging lens group comprising seven lenses.
Background
With the development of science and technology, large-image-plane mobile phone lenses play important roles in more and more places, such as photography, security protection, measurement, projection, entertainment, automobiles and the like. With the increasing shooting requirements of customers, the image plane of the mobile phone camera lens is also enlarged.
However, the first lens of the conventional large-image-plane mobile phone camera lens is designed to be a convex lens, and when the field of view is about 50 °, a relatively serious four-time inner reflection ghost image is generated, so that the imaging quality is poor, and poor experience is brought to users. Therefore, in order to improve the phenomenon, the shape of the first lens needs to be adjusted to increase the curvature, so that the four-time inner-reflection ghost image is eliminated, the rest ghost images are weakened, and the overall imaging quality of the lens is effectively improved.
Disclosure of Invention
The invention aims to provide an optical imaging lens group consisting of seven lenses, which can eliminate four-time inner anti-ghost images and weaken the rest ghost images by adjusting the shape of a first lens and increasing the curvature, thereby effectively improving the integral imaging quality of the lens.
One aspect of the present invention provides an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; the image side surface of the second lens is a convex surface; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens having a positive optical power; a fifth lens having a refractive power, an object side surface of which is concave; a sixth lens having a refractive power, an image-side surface of which is concave; and a seventh lens having optical power.
Wherein, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy: TTL/ImgH < 1.5; the maximum field angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group meet the following conditional expression: tan (FOV/2). times.f >5.5 mm.
According to one embodiment of the invention, the effective focal length f1 of the first lens and the effective focal length f of the optical imaging lens group satisfy: 1.7< f1/f < 3.4.
According to one embodiment of the invention, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 1< f2/f4< 1.5.
According to one embodiment of the present invention, the sum of absolute differences Σ | Δ CT | between the center thickness of each lens and the average center thickness of seven lenses and the average center thickness CTA of seven lenses satisfy: Σ | Δ CT |/CTA < 1.2.
According to one embodiment of the invention, the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical imaging lens group satisfy: -0.8< R9/f <0.
According to one embodiment of the invention, the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens meet: r12/f6 is more than or equal to 0.3 and less than or equal to 0.7.
According to one embodiment of the present invention, the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy: 0.8< CT4/CT5< 1.2.
According to an embodiment of the present invention, the on-axis distance T45 between the fourth lens and the fifth lens and the on-axis distance T56 between the fifth lens and the sixth lens satisfy: 1< T45/T56< 2.
According to one embodiment of the invention, the maximum effective radius DT11 of the object side surface of the first lens and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfy: 0< DT11/ImgH < 0.5.
According to one embodiment of the present invention, an on-axis spacing distance SAG61 between an intersection of the sixth lens object-side surface and the optical axis to an effective radius vertex of the sixth lens object-side surface and an on-axis spacing distance SAG62 between an intersection of the sixth lens image-side surface and the optical axis to an effective radius vertex of the sixth lens image-side surface satisfy: 0.3< SAG61/SAG62< 0.8.
According to one embodiment of the present invention, a vertical distance YC72 from a critical point of the image-side surface of the seventh lens to the optical axis and a maximum effective radius DT72 of the image-side surface of the seventh lens satisfy: 0.3< YC72/DT72< 0.8.
According to one embodiment of the present invention, an on-axis spacing distance YT61 between an intersection point of the sixth lens object-side surface and the optical axis to a critical point of the sixth lens object-side surface satisfies with a center thickness CT6 of the sixth lens: 0.2< YT61/CT6< 0.7.
Another aspect of the present invention provides an optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising: a first lens having a positive optical power; the image side surface of the second lens is a convex surface; a third lens having a refractive power, an image-side surface of which is concave; a fourth lens having a positive optical power; a fifth lens having a refractive power, an object side surface of which is concave; a sixth lens having a refractive power, an image-side surface of which is concave; and a seventh lens having optical power.
Wherein, each lens is independent, and there is air space on the optical axis between each lens; the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group meet the following conditions: TTL/ImgH < 1.5; an on-axis distance T45 between the fourth lens and the fifth lens and an on-axis distance T56 between the fifth lens and the sixth lens satisfy: 1< T45/T56< 2.
The invention has the beneficial effects that:
the optical imaging lens group provided by the invention comprises a plurality of lenses, such as a first lens to a seventh lens. According to the optical imaging lens group, the curvature is increased by adjusting the shape of the first lens, so that four internal reflection ghost images are eliminated, the rest ghost images are weakened, and the integral imaging quality of the lens is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a lens assembly of an optical imaging lens assembly of embodiment 1 of the present invention;
fig. 2a to fig. 2e are an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a ray aberration curve-meridional direction, and a ray aberration-sagittal direction, respectively, of an optical imaging lens assembly according to embodiment 1 of the present invention;
FIG. 3 is a schematic view of a lens assembly of an optical imaging lens assembly according to embodiment 2 of the present invention;
fig. 4a to 4e respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a ray aberration curve-meridional direction, and a ray aberration-sagittal direction of an optical imaging lens assembly in example 2 of the present invention;
FIG. 5 is a schematic view of a lens assembly according to embodiment 3 of the present invention;
fig. 6a to 6e respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a ray aberration curve-meridional direction, and a ray aberration-sagittal direction of an optical imaging lens assembly in example 3 of the present invention;
FIG. 7 is a schematic diagram of a lens assembly according to embodiment 4 of the present invention;
fig. 8a to 8e show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a ray aberration curve-meridional direction, and a ray aberration-sagittal direction, respectively, in an optical imaging lens assembly in accordance with embodiment 4 of the present invention;
FIG. 9 is a schematic view of a lens assembly of an optical imaging lens assembly according to embodiment 5 of the present invention;
fig. 10a to 10e respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, a ray aberration curve-meridional direction, and a ray aberration-sagittal direction of an optical imaging lens assembly in accordance with embodiment 5 of the present invention;
FIG. 11 is a schematic view of a lens assembly according to embodiment 6 of the present invention;
fig. 12a to 12e are a plot of on-axis chromatic aberration, an astigmatic curve, a distortion curve, a ray aberration curve-meridional direction, and a ray aberration-sagittal direction, respectively, of an optical imaging lens assembly according to embodiment 6 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.
In the description of the present invention, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. Features, principles and other aspects of the present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Exemplary embodiments
The optical imaging lens assembly according to an exemplary embodiment of the present invention includes seven lenses, in order from an object side to an image side along an optical axis: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the lenses are independent from each other, and an air space is formed between the lenses on an optical axis.
In the present exemplary embodiment, the first lens has positive optical power; the second lens has positive focal power, and the image side surface of the second lens is a convex surface; the third lens can have positive focal power or negative focal power, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power; the fifth lens can have positive focal power or negative focal power, and the object side surface of the fifth lens is a concave surface; the sixth lens can have positive focal power or negative focal power, and the image side surface of the sixth lens is a concave surface; the seventh lens may have a positive power or a negative power. The focal power and the surface type of each lens are reasonably configured, the imaging quality of the optical imaging lens group is effectively ensured, and the large field angle is ensured, and meanwhile, the compact structure, the short total length and the large image surface characteristic of the lens are facilitated.
In the present exemplary embodiment, the conditional expression that the on-axis distance TTL from the object-side surface of the first lens to the imaging surface of the optical imaging lens group and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfy is: TTL/ImgH < 1.5. More specifically, TTL and ImgH satisfy: 1.2< TTL/ImgH <1.4, e.g., 1.30 ≦ TTL/ImgH ≦ 1.37.
In the present exemplary embodiment, the conditional expression that the maximum field angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group satisfy is: tan (FOV/2). times.f >5.5 mm. More specifically, FOV and f satisfy: 5.8mm < tan (FOV/2) × f <8mm, for example, 6.00mm ≦ tan (FOV/2) × f ≦ 7.62 mm.
In the present exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length f of the optical imaging lens group satisfy the conditional expression: 1.7< f1/f < 3.4. The positive focal length of the first lens is too long to correct the aberration; if the length is too short, the processing is not favorable, and the four-time internal reflection ghost image is improved. The satisfaction of the above formula is beneficial to ensuring high image quality and simultaneously considering good manufacturability. More specifically, f1 and f satisfy: 1.8< f1/f <3.3, e.g., 1.81. ltoreq. f 1/f. ltoreq.3.27.
In the present exemplary embodiment, the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy the conditional expression: 1< f2/f4< 1.5. If the above ratio is too large, the fourth lens element will bear too much refractive power, and the manufacturability is too poor to correct the aberration; if it is too small, the aperture of the second lens is not easy to be made large, resulting in poor assembly manufacturability. The manufacturability and the assembling manufacturability of the lens can be effectively ensured by satisfying the above formula. More specifically, f2 and f4 satisfy: 1.3< f2/f4<1.48, e.g., 1.37. ltoreq. f2/f 4. ltoreq.1.46.
In the present exemplary embodiment, the sum of absolute values of the differences Σ | Δ CT | between the center thickness of each lens and the average center thickness of seven lenses and the average center thickness CTA of seven lenses satisfies the conditional expression: Σ | Δ CT |/CTA < 1.2. The above ratio ensures the uniformity of lens distribution. The manufacturability and the assembling manufacturability of the lens can be effectively ensured by satisfying the above formula. More specifically, Σ | Δ CT | satisfies with CTA: 0.5< ∑ Δ CT/CTA <1.1, e.g., 0.64 ≦ Σ Δ CT/CTA ≦ 1.01.
In the present exemplary embodiment, the radius of curvature R9 of the object-side surface of the fifth lens and the effective focal length f of the optical imaging lens group satisfy the conditional expression: -0.8< R9/f <0. By appropriately arranging the surface shape of the image-side surface S2 of the first lens L4, astigmatism of the lens can be effectively balanced. More specifically, R9 and f satisfy: 0.7< R9/f < -0.4, for example, -0.62. ltoreq. R9/f. ltoreq.0.45.
In the present exemplary embodiment, the radius of curvature R12 of the image-side surface of the sixth lens and the effective focal length f6 of the sixth lens satisfy the conditional expression: r12/f6 is more than or equal to 0.3 and less than or equal to 0.7. By appropriately arranging the radius of curvature of the image-side surface S1 of the sixth lens element L6, spherical aberration and astigmatism can be effectively reduced. More specifically, R12 and f6 satisfy: 0.3. ltoreq.R 12/f6<0.65, for example 0.30. ltoreq.R 12/f 6. ltoreq.0.63.
In the present exemplary embodiment, the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy the conditional expression: 0.8< CT4/CT5< 1.2. The thickness of the fourth and fifth lenses is too large to correct monochromatic aberration, and too small to assemble. The method meets the above formula and effectively considers manufacturability and image quality. More specifically, CT4 and CT5 satisfy: 0.9< CT4/CT5<1.1, e.g., 0.91 ≦ CT4/CT5 ≦ 1.00.
In the present exemplary embodiment, the on-axis pitch T45 between the fourth lens and the fifth lens and the on-axis pitch T56 between the fifth lens and the sixth lens satisfy the conditional expression: 1< T45/T56< 2. The ratio of the upper formula enlarges the axial distance between the fourth lens and the fifth lens, which is beneficial to the distribution of the thickness of the lens barrel. More specifically, T45 and T56 satisfy: 1.2< T45/T56<1.7, e.g., 1.30 ≦ T45/T56 ≦ 1.67.
In the present exemplary embodiment, the conditional expression that the maximum effective radius DT11 of the object-side surface of the first lens and the half ImgH of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group satisfy is: 0< DT11/ImgH < 0.5. Too large a ratio is disadvantageous for miniaturization of the system, and too small a ratio is disadvantageous for assembly. This ratio effectively balances lens size and manufacturability. More specifically, DT11 and ImgH satisfy: 0.2< DT11/ImgH <0.4, e.g., 0.29 ≦ DT11/ImgH ≦ 0.34.
In the present exemplary embodiment, the conditional expression that the on-axis spacing distance SAG61 between the intersection of the sixth lens object-side surface and the optical axis to the effective radius vertex of the sixth lens object-side surface and the on-axis spacing distance SAG62 between the intersection of the sixth lens image-side surface and the optical axis to the effective radius vertex of the sixth lens image-side surface satisfies: 0.3< SAG61/SAG62< 0.8. By reasonably configuring the parameters, the difficulty of lens molding can be effectively reduced, and the manufacturing is facilitated. More specifically, SAG61 and SAG62 satisfy: 0.4< SAG61/SAG62<0.75, e.g., 0.41 ≦ SAG61/SAG62 ≦ 0.72.
In the present exemplary embodiment, the vertical distance YC72 from the critical point of the image-side surface of the seventh lens to the optical axis and the maximum effective radius DT72 of the image-side surface of the seventh lens satisfy the conditional expression: 0.3< YC72/DT72< 0.8. The design is favorable for realizing the miniaturization of the lens on the basis of ensuring that the lens has a large enough visual angle and high imaging quality. More specifically, YC72 and DT72 satisfy: 0.35< YC72/DT72<0.5, e.g., 0.40 ≦ YC72/DT72 ≦ 0.45.
In the present exemplary embodiment, the on-axis spacing distance YT61 between the intersection of the sixth lens object-side surface and the optical axis to the critical point of the sixth lens object-side surface and the center thickness CT6 of the sixth lens satisfies the conditional expression: 0.2< YT61/CT6< 0.7. The design is favorable for realizing the miniaturization of the lens on the basis of ensuring that the lens has a large enough visual angle and high imaging quality. More specifically, YT61 and CT6 satisfy: 0.25< YT61/CT6<0.65, e.g., 0.27 ≦ YT61/CT6 ≦ 0.60.
In the present exemplary embodiment, the above-described optical imaging lens group may further include a stop. The stop may be disposed at an appropriate position as needed, for example, the stop may be disposed between the object side and the first 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 on an imaging surface.
The optical imaging lens group according to the above embodiment of the present invention may employ a plurality of lenses, for example, the above seven lenses. The optical imaging lens group has the characteristics of large imaging image surface, wide imaging range and high imaging quality by reasonably distributing the focal power and the surface type of each lens, the central thickness of each lens, the on-axis distance between each lens and the like, and the ultrathin property of the mobile phone is ensured.
In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspheric mirror surface, i.e., at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspheric mirror surface. The aspheric lens is characterized in that: the aspherical lens has a better curvature radius characteristic, and has advantages of improving distortion aberration and astigmatic aberration, unlike a spherical lens having a constant curvature from the lens center to the lens periphery, in which the curvature is continuously varied from the lens center to the lens periphery. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of an object-side surface and an image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is an aspheric mirror surface. Optionally, each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens has an object-side surface and an image-side surface which are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the optical imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the claimed subject matter. For example, although seven lenses are exemplified in the embodiments, the optical imaging lens group is not limited to include seven lenses, and the optical imaging lens group may include other numbers of lenses if necessary.
Specific embodiments of an optical imaging lens group suitable for the above embodiments are further described below with reference to the drawings.
Detailed description of the preferred embodiment 1
Fig. 1 is a schematic view of a lens assembly structure of an optical imaging lens assembly in embodiment 1 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17.
As shown in table 1, a basic parameter table of the optical imaging lens group of example 1 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round 200.0000
STO Spherical surface All-round -0.4088
S1 Aspherical surface 3.2782 0.7795 13.65 1.55 56.1 -1.4737
S2 Aspherical surface 5.3649 0.1567 -1.5598
S3 Aspherical surface 8.6084 0.6581 8.83 1.55 56.1 6.9002
S4 Aspherical surface -10.6572 0.0400 -36.4559
S5 Aspherical surface 5.9003 0.4400 -12.04 1.68 19.2 0.9153
S6 Aspherical surface 3.3199 0.5988 0.4354
S7 Aspherical surface 173.4577 0.6000 21.42 1.55 56.1 99.0000
S8 Aspherical surface -12.5167 0.3526 23.7766
S9 Aspherical surface -4.2131 0.6000 -20.63 1.68 19.2 -2.4267
S10 Aspherical surface -6.3799 0.2110 1.6325
S11 Aspherical surface 2.7207 0.7036 12.74 1.55 56.1 -7.3859
S12 Aspherical surface 4.0627 1.2732 -11.9044
S13 Aspherical surface 5.9625 0.7446 -8.83 1.54 55.7 0.1580
S14 Aspherical surface 2.5257 0.4045 -6.2078
S15 Spherical surface All-round 0.2600 1.52 64.2
S16 Spherical surface All-round 0.8486
S17 Spherical surface All-round
TABLE 1
As shown in table 2, in example 1, the total effective focal length f of the optical imaging lens group is 6.77mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens group imaging surface S17 is 8.43mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 6.46mm, and the maximum field angle FOV of the optical imaging lens group is 85.9 °.
Figure BDA0002906803340000071
TABLE 2
The optical imaging lens group in embodiment 1 satisfies:
the TTL/ImgH is 1.37, where TTL is an on-axis distance from the object-side surface of the first lens element to the imaging surface of the optical imaging lens assembly, and ImgH is half of a diagonal length of an effective pixel area on the imaging surface of the optical imaging lens assembly;
tan (FOV/2) × f ═ 6.00mm, where FOV is the maximum field angle of the optical imaging lens group, and f is the effective focal length of the optical imaging lens group;
f1/f is 2.02, wherein f1 is the effective focal length of the first lens, and f is the effective focal length of the optical imaging lens group;
f2/f4 is 1.37, wherein f2 is the effective focal length of the second lens, and f4 is the effective focal length of the fourth lens;
Σ | Δ CT |/CTA ═ 0.93, where Σ | Δ CT | is the sum of absolute values of differences between the center thickness of each lens and the average center thickness of the seven lenses, and CTA is the average center thickness of the seven lenses;
r9/f is-0.62, where R9 is the radius of curvature of the object-side surface of the fifth lens element, and f is the effective focal length of the optical imaging lens group;
r12/f6 is 0.32, where R12 is the radius of curvature of the image-side surface of the sixth lens, and f6 is the effective focal length of the sixth lens;
CT4/CT5 is 1.00, where CT4 is the central thickness of the fourth lens on the optical axis, and CT5 is the central thickness of the fifth lens on the optical axis;
T45/T56 ═ 1.67, where T45 is the on-axis spacing between the fourth lens and the fifth lens, and T56 is the on-axis spacing between the fifth lens and the sixth lens;
DT11/ImgH is 0.29, where DT11 is the maximum effective radius of the object-side surface of the first lens, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens group;
SAG61/SAG62 is 0.46, wherein SAG61 is an on-axis spacing distance from the intersection point of the object side surface of the sixth lens and the optical axis to the effective radius vertex of the object side surface of the sixth lens, and SAG62 is an on-axis spacing distance from the intersection point of the image side surface of the sixth lens and the optical axis to the effective radius vertex of the image side surface of the sixth lens;
YC72/DT72 is 0.41, where YC72 is the vertical distance from the critical point of the image-side surface of the seventh lens to the optical axis, and DT72 is the maximum effective radius of the image-side surface of the seventh lens;
YT61/CT6 is 0.60, where YT61 is the on-axis separation distance between the intersection of the object-side surface of the sixth lens and the optical axis and the critical point of the object-side surface of the sixth lens, and CT6 is the center thickness of the sixth lens.
In embodiment 1, the object-side surface and the image-side surface of any one of the first lens E1 through the seventh lens E7 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
Figure BDA0002906803340000081
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspheric surface.
In example 1, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and table 3 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 14、A6、A8、A10、A12、A14、A16、A18And A20。
Figure BDA0002906803340000082
Figure BDA0002906803340000091
TABLE 3
Fig. 2a shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 1, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 2b shows an astigmatism curve representing meridional and sagittal field curvatures of the optical imaging lens group of embodiment 1. Fig. 2c shows a distortion curve of the optical imaging lens group of embodiment 1, which represents distortion magnitude values corresponding to different image heights. Fig. 2d shows the ray aberration curve-meridional direction of the optical imaging lens group of example 1. Fig. 2e shows the ray phase difference-sagittal direction of the optical imaging lens group of embodiment 1. As can be seen from fig. 2a to 2e, the optical imaging lens assembly of embodiment 1 can achieve good imaging quality.
Specific example 2
Fig. 3 is a lens assembly structure view of the optical imaging lens assembly according to embodiment 2 of the present invention, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17.
As shown in table 4, the basic parameter table of the optical imaging lens group of example 2 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface All-round -0.4088
S1 Aspherical surface 3.2479 0.7471 13.64 1.54 55.7 -1.5079
S2 Aspherical surface 5.3701 0.1631 -1.2533
S3 Aspherical surface 9.1638 0.6963 9.22 1.55 56.1 3.9892
S4 Aspherical surface -10.8580 0.0400 -20.3709
S5 Aspherical surface 6.0473 0.5000 -12.46 1.68 19.2 -0.1781
S6 Aspherical surface 3.4060 0.5847 0.1100
S7 Aspherical surface 301.9804 0.6000 15.97 1.55 56.1 99.0000
S8 Aspherical surface -8.9618 0.3092 -0.8114
S9 Aspherical surface -3.8263 0.6000 -16.89 1.68 19.2 -4.5416
S10 Aspherical surface -6.1123 0.2382 0.3214
S11 Aspherical surface 2.8047 0.7000 13.20 1.55 56.1 -7.7210
S12 Aspherical surface 4.1891 1.2103 -12.7147
S13 Aspherical surface 5.9617 0.7500 -8.84 1.54 55.7 0.1470
S14 Aspherical surface 2.5255 0.4248 -5.8239
S15 Spherical surface All-round 0.2600 1.52 64.2
S16 Spherical surface All-round 0.6063
S17 Spherical surface All-round
TABLE 4
As shown in table 5, in example 2, the total effective focal length f of the optical imaging lens group is 6.80mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens group imaging surface S17 is 8.43mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 6.46mm, and the maximum field angle FOV of the optical imaging lens group is 85.8 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002906803340000101
TABLE 5
In example 2, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and table 6 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 24、A6、A8、A10、A12、A14、A16、A18And A20。
Figure BDA0002906803340000111
TABLE 6
Fig. 4a shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 2, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 4b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 2. 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 the ray aberration curve-meridional direction of the optical imaging lens group of example 2. Fig. 4e shows the ray aberration curve-sagittal direction of the optical imaging lens group of embodiment 2. As can be seen from fig. 4a to 4e, the optical imaging lens group according to embodiment 2 can achieve good imaging quality.
Specific example 3
Fig. 5 is a lens assembly structure of an optical imaging lens assembly according to embodiment 3 of the present invention, which, in order from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17.
As shown in table 7, the basic parameter table of the optical imaging lens group of embodiment 3 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface All-round -0.4088
S1 Aspherical surface 3.2479 0.7573 13.62 1.54 55.7 -1.4985
S2 Aspherical surface 5.3701 0.1604 -1.5224
S3 Aspherical surface 9.0833 0.6908 9.25 1.55 56.1 3.8289
S4 Aspherical surface -11.0365 0.0400 -20.0365
S5 Aspherical surface 6.1579 0.5000 -12.57 1.68 19.2 -0.1950
S6 Aspherical surface 3.4572 0.5868 0.1532
S7 Aspherical surface -789.7744 0.6000 15.95 1.55 56.1 99.0000
S8 Aspherical surface -8.6094 0.3069 -1.7123
S9 Aspherical surface -3.8141 0.6000 -16.74 1.68 19.2 -4.4809
S10 Aspherical surface -6.1123 0.2245 0.2021
S11 Aspherical surface 2.8053 0.7000 13.17 1.55 56.1 -7.8203
S12 Aspherical surface 4.1977 1.2171 -12.0827
S13 Aspherical surface 5.9617 0.7500 -8.84 1.54 55.7 0.1189
S14 Aspherical surface 2.5255 0.4298 -5.6993
S15 Spherical surface All-round 0.2600 1.52 64.2
S16 Spherical surface All-round 0.6063
S17 Spherical surface All-round
TABLE 7
As shown in table 8, in example 3, the total effective focal length f of the optical imaging lens group is 6.80mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens group imaging surface S17 is 8.41mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 6.46mm, and the maximum field angle FOV of the optical imaging lens group is 87.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002906803340000121
Figure BDA0002906803340000131
TABLE 8
In example 3, the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 are aspheric, and table 9 shows the high-order term coefficients a usable for the aspheric mirror surfaces S1 to S14 in example 34、A6、A8、A10、A12、A14、A16、A18And A20。
Figure BDA0002906803340000132
TABLE 9
Fig. 6a shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 3, which represents a convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of embodiment 3. 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 the ray aberration curve-meridional direction of the optical imaging lens group of example 3. Fig. 6e shows the ray aberration curve-sagittal direction of the optical imaging lens group of embodiment 3. As can be seen from fig. 6a to 6e, the optical imaging lens group according to embodiment 3 can achieve good imaging quality.
Specific example 4
Fig. 7 is a lens assembly structure of an optical imaging lens assembly according to embodiment 4 of the present invention, which, in order from an object side to an image side along an optical axis: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17.
As shown in table 10, the basic parameter table of the optical imaging lens group of example 4 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Figure BDA0002906803340000141
Figure BDA0002906803340000151
Watch 10
As shown in table 11, in example 4, the total effective focal length f of the optical imaging lens group is 8.92mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens group imaging surface S17 is 8.42mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 6.46mm, and the maximum field angle FOV of the optical imaging lens group is 81.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002906803340000152
TABLE 11
In example 4, the object-side surface and the image-side surface of any one of the first lens E1 to the seventh lens E7 are aspheric, and table 12 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S14 in example 44、A6、A8、A10、A12、A14、A16、A18、A20、A22、A24、A26、A28And A30。
Figure BDA0002906803340000153
Figure BDA0002906803340000161
TABLE 12
Fig. 8a shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of example 4. 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 the ray aberration curve-meridional direction of the optical imaging lens group of example 4. Fig. 8e shows the ray aberration curve versus the sagittal direction of the optical imaging lens group of embodiment 4. As can be seen from fig. 8a to 8e, the optical imaging lens group according to embodiment 4 can achieve good imaging quality.
Specific example 5
Fig. 9 is a lens assembly structure of the optical imaging lens assembly according to embodiment 5 of the present invention, which, in order from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a convex object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17.
As shown in table 13, the basic parameter table of the optical imaging lens group of example 5 is shown, wherein the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Figure BDA0002906803340000162
Figure BDA0002906803340000171
Watch 13
As shown in table 14, in example 5, the total effective focal length f of the optical imaging lens group is 6.66mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens group imaging surface S17 is 8.41mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 6.46mm, and the maximum field angle FOV of the optical imaging lens group is 87.0 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002906803340000172
TABLE 14
In example 5, the object-side surface and the image-side surface of any one of the first lens element E1 through the seventh lens element E7 are aspheric, and table 15 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 through S14 in example 54、A6、A8、A10、A12、A14、A16、A18And A20。
Figure BDA0002906803340000173
Figure BDA0002906803340000181
Watch 15
Fig. 10a shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 5, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 10b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of example 5. 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 the ray aberration curve-meridional direction of the optical imaging lens group of example 5. Fig. 10e shows the ray phase difference-sagittal direction of the optical imaging lens group of embodiment 5. As can be seen from fig. 10a to 10e, the optical imaging lens group according to embodiment 5 can achieve good imaging quality.
Specific example 6
Fig. 11 is a lens assembly structure of the optical imaging lens assembly according to embodiment 6, which, in order from an object side to an image side along an optical axis, includes: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an image forming surface S17.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a convex object-side surface S3 and a convex image-side surface S4. The third lens element E3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6. The fourth lens element E4 has positive power, and has a concave object-side surface S7 and a convex image-side surface S8. The fifth lens element E5 has negative power, and has a concave object-side surface S9 and a convex image-side surface S10. The sixth lens element E6 has positive power, and has a convex object-side surface S11 and a concave image-side surface S12. The seventh lens element E7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14. Filter E8 has an object side S15 and an image side S16. The light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17.
As shown in table 16, the basic parameter table of the optical imaging lens group of example 6 is shown, in which the units of the radius of curvature, the thickness, and the focal length are all millimeters (mm).
Flour mark Surface type Radius of curvature Thickness/distance Focal length Refractive index Coefficient of dispersion Coefficient of cone
OBJ Spherical surface All-round All-round
STO Spherical surface All-round -0.4088
S1 Aspherical surface 3.2478 0.7632 13.60 1.54 55.7 -1.5065
S2 Aspherical surface 5.3701 0.1624 -1.2399
S3 Aspherical surface 9.4035 0.6825 9.37 1.55 56.1 3.6954
S4 Aspherical surface -10.9075 0.0459 -20.6405
S5 Aspherical surface 5.8703 0.5001 -13.15 1.68 19.2 -0.2719
S6 Aspherical surface 3.4172 0.5950 0.1060
S7 Aspherical surface -314.7593 0.6000 16.24 1.55 56.1 99.0000
S8 Aspherical surface -8.6232 0.3127 -1.5127
S9 Aspherical surface -3.8169 0.6000 -16.77 1.68 19.2 -4.6302
S10 Aspherical surface -6.1123 0.2256 0.0820
S11 Aspherical surface 2.7708 0.7000 13.26 1.55 56.1 -7.7117
S12 Aspherical surface 4.0906 1.2043 -12.9067
S13 Aspherical surface 5.9710 0.7500 -8.34 1.57 37.3 0.0769
S14 Aspherical surface 2.5272 0.4126 -6.4310
S15 Spherical surface All-round 0.2600 1.52 64.2
S16 Spherical surface All-round 0.6063
S17 Spherical surface All-round
TABLE 16
As shown in table 17, in example 6, the total effective focal length f of the optical imaging lens group is 6.80mm, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the optical imaging lens group imaging surface S17 is 8.42mm, the half ImgH of the diagonal length of the effective pixel region on the imaging surface S17 is 6.40mm, and the maximum field angle FOV of the optical imaging lens group is 85.2 °. The parameters of each relation are as explained in the first embodiment, and the values of each relation are as listed in the following table.
Figure BDA0002906803340000191
TABLE 17
In example 6, the object-side surface and the image-side surface of any one of the first lens element E1 to the seventh lens element E7 are aspheric, and table 18 shows the high-order term coefficients a that can be used for the aspheric mirror surfaces S1 to S14 in example 64、A6、A8、A10、A12、A14、A16、A18And A20。
Figure BDA0002906803340000201
Watch 18
Fig. 12a shows an on-axis chromatic aberration curve of the optical imaging lens group of embodiment 6, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 12b shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the optical imaging lens group of example 6. 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 the ray aberration curve-meridional direction of the optical imaging lens group of example 6. Fig. 12e shows the ray contrast curve versus sagittal direction. As can be seen from fig. 12a to 12e, the optical imaging lens group according to embodiment 6 can achieve good imaging quality.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, improvements, equivalents and the like that fall within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. An optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising:
a first lens having a positive optical power;
the image side surface of the second lens is a convex surface;
a third lens having a refractive power, an image-side surface of which is concave;
a fourth lens having a positive optical power;
a fifth lens having a refractive power, an object side surface of which is concave;
a sixth lens having a refractive power, an image-side surface of which is concave;
a seventh lens having optical power;
wherein, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy: TTL/ImgH < 1.5; the maximum field angle FOV of the optical imaging lens group and the effective focal length f of the optical imaging lens group meet the following conditional expression: tan (FOV/2). times.f >5.5 mm.
2. The optical imaging lens group of claim 1, wherein: the effective focal length f1 of the first lens and the effective focal length f of the optical imaging lens group meet the following conditions: 1.7< f1/f < 3.4.
3. The optical imaging lens group of claim 1, wherein: the effective focal length f2 of the second lens and the effective focal length f4 of the fourth lens satisfy: 1< f2/f4< 1.5.
4. The optical imaging lens group of claim 1, wherein: the sum of absolute differences Σ | Δ CT | between the center thickness of each lens and the average center thickness of seven lenses and the average center thickness CTA of seven lenses satisfy: Σ | Δ CT |/CTA < 1.2.
5. The optical imaging lens group of claim 1, wherein: the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical imaging lens group meet the following conditions: -0.8< R9/f <0.
6. The optical imaging lens group of claim 1, wherein: the curvature radius R12 of the image side surface of the sixth lens and the effective focal length f6 of the sixth lens meet: r12/f6 is more than or equal to 0.3 and less than or equal to 0.7.
7. The optical imaging lens group of claim 1, wherein: the central thickness CT4 of the fourth lens on the optical axis and the central thickness CT5 of the fifth lens on the optical axis satisfy that: 0.8< CT4/CT5< 1.2.
8. The optical imaging lens group of claim 1, wherein: an on-axis pitch T45 between the fourth and fifth lenses and an on-axis pitch T56 between the fifth and sixth lenses satisfies: 1< T45/T56< 2.
9. The optical imaging lens group of claim 1, wherein: the maximum effective radius DT11 of the object side surface of the first lens and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy that: 0< DT11/ImgH < 0.5.
10. An optical imaging lens assembly, in order from an object side to an image side along an optical axis, comprising:
a first lens having a positive optical power;
the image side surface of the second lens is a convex surface;
a third lens having a refractive power, an image-side surface of which is concave;
a fourth lens having a positive optical power;
a fifth lens having a refractive power, an object side surface of which is concave;
a sixth lens having a refractive power, an image-side surface of which is concave;
a seventh lens having optical power;
wherein, the on-axis distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group and the half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging lens group satisfy: TTL/ImgH < 1.5; the on-axis distance T45 between the fourth lens and the fifth lens and the on-axis distance T56 between the fifth lens and the sixth lens satisfy: 1< T45/T56< 2.
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