CN108459398B - Optical image lens assembly - Google Patents

Optical image lens assembly Download PDF

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CN108459398B
CN108459398B CN201810471683.7A CN201810471683A CN108459398B CN 108459398 B CN108459398 B CN 108459398B CN 201810471683 A CN201810471683 A CN 201810471683A CN 108459398 B CN108459398 B CN 108459398B
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lens
optical
optical imaging
image
focal length
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CN108459398A (en
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张晓辉
吕赛锋
李龙
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to PCT/CN2019/077286 priority patent/WO2019218760A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • 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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  • Optics & Photonics (AREA)
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Abstract

The application discloses an optical image lens group, which sequentially comprises a covering lens and a lens group from an object side to an image side along an optical axis, wherein the covering lens can have positive focal power or negative focal power, and the object side surface of the covering lens is a plane; the lens group sequentially comprises a first lens with positive focal power, a second lens with negative focal power and a plurality of subsequent lenses from an object side to an image side, wherein the effective focal length f of the optical image lens group and the effective focal length f1 of the first lens can meet the following conditions: 0.5< f/f1<1.5.

Description

Optical image lens assembly
Technical Field
The present invention relates to an optical imaging lens assembly, and more particularly, to an optical imaging lens assembly composed of three to eight lenses.
Background
The structure of the 2-piece lens and the 3-piece lens which gradually exit the market can be regenerated by the influence of the trend of miniaturization and thinning of the mobile phone market. However, the optical performance of the lens is still difficult to break through greatly because the 2-piece lens and the 3-piece lens are limited by design. The common mobile phone lens is focused by the first lens of the lens, and the protective glass in front of the lens only plays a role in protecting the lens. In order to meet the market development demand, the image lens needs to use a smaller number of lenses as much as possible, shortening the total lens length, but it is thus difficult to meet the imaging quality demand.
Therefore, the application provides an optical system which is applicable to portable electronic products and has the characteristics of miniaturization, good imaging quality and low sensitivity.
Disclosure of Invention
The technical scheme provided by the application at least partially solves the technical problems.
According to an aspect of the present application, there is provided an optical image lens group, which may include a cover lens and a lens group in order from an object side to an image side along an optical axis, wherein the cover lens may have positive optical power or negative optical power, and an object side thereof is a plane; the lens group sequentially comprises a first lens with positive focal power, a second lens with negative focal power and a plurality of subsequent lenses from an object side to an image side, wherein the effective focal length f of the optical image lens group and the effective focal length f1 of the first lens can meet the following conditions: 0.5< f/f1<1.5.
In one embodiment, the effective focal length f of the optical imaging lens assembly and the effective focal length f of the cover lens TP The method can meet the following conditions: i f/f TP |<0.5。
In one embodiment, the effective focal length f2 of the second lens and the effective focal length f of the cover lens TP The method can meet the following conditions: 0<|f2/f TP |<1。
In one embodiment, the effective focal length f of the optical image group and the radius of curvature R of the image side of the overlay lens TP2 The method can meet the following conditions: i f/R TP2 |<1。
In one embodiment, the effective focal length f of the optical image lens assembly and the effective focal length f2 of the second lens can satisfy: 1<f/f2<0.
In one embodiment, the effective half-aperture D of the object side of the cover lens TP1 The following conditions are satisfied between the optical imaging lens group and the entrance pupil diameter EPD: 0.5<D TP1 /EPD<2.5。
In one embodiment, the curvature radius R4 of the image side of the second lens and the curvature radius R4 of the object side of the first lens may satisfy: (R4-R1)/(R4+R1) | <2.5.
In one embodiment, the air space T of the cover lens and the first lens on the optical axis TP The following conditions are satisfied between the optical imaging lens group and the entrance pupil diameter EPD: 0<T TP /EPD<1.6。
In one embodiment, the conditional expression may be satisfied: 1<f/(CT TP +T TP )<5, wherein f is the effective focal length of the optical image lens group; CT (computed tomography) TP To cover the center thickness of the lens; t is as follows TP Covering the air space between the lens and the first lens on the optical axis.
In one embodiment, the center thickness CT of the cover lens TP And the center thickness CT2 of the second lens can meet the following conditions: 0<CT TP /CT2<4。
According to another aspect of the present application, there is also provided an optical imaging lens assembly comprisingThe optical image lens assembly can sequentially comprise a covering lens and a lens assembly from an object side to an image side along an optical axis, wherein the covering lens can have positive focal power or negative focal power, and the object side is a plane; the lens group sequentially comprises a first lens with positive focal power, a second lens with negative focal power and a plurality of subsequent lenses from the object side to the image side, wherein the effective focal length f2 of the second lens and the effective focal length f of the covering lens TP The method can meet the following conditions: 0<|f2/f TP |<1。
According to still another aspect of the present application, there is further provided an optical image lens group, which may include a cover lens and a lens group sequentially from an object side to an image side along an optical axis, wherein the cover lens may have positive optical power or negative optical power, and an object side thereof is a plane; the lens group sequentially comprises a first lens with positive focal power, a second lens with negative focal power and a plurality of subsequent lenses from the object side to the image side, wherein the effective half-caliber D of the object side of the lens is covered TP1 The following conditions are satisfied between the optical imaging lens group and the entrance pupil diameter EPD: 0.5<D TP1 /EPD<2.5。
The optical image lens set with the configuration has at least one beneficial effect of miniaturization, high imaging quality, balanced aberration, low sensitivity, low cost and the like.
Drawings
The above and other advantages of embodiments of the present application will become apparent by reference to the following detailed description of the embodiments with reference to the accompanying drawings, which are intended to illustrate exemplary embodiments of the present application and not to limit it. In the drawings:
fig. 1 is a schematic view showing the structure of an optical imaging lens assembly according to embodiment 1 of the present application;
fig. 2A to 2D 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 set of embodiment 1;
Fig. 3 is a schematic view showing the structure of an optical imaging lens assembly 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 set of embodiment 2;
fig. 5 is a schematic view showing the structure of an optical imaging lens assembly 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 set of embodiment 3;
fig. 7 is a schematic view showing the structure of an optical imaging lens assembly 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 set of embodiment 4;
fig. 9 is a schematic view showing the structure of an optical imaging lens set 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 set of embodiment 5;
fig. 11 is a schematic view showing the structure of an optical imaging lens set 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 set of example 6;
Fig. 13 is a schematic view showing the structure of an optical imaging lens set 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 set of example 7;
fig. 15 is a schematic view showing the structure of an optical imaging lens set according to embodiment 8 of the present application; and
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 set of example 8.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation of the feature. Accordingly, a first lens discussed below may also be referred to as a second 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.
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, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
As used herein, the terms "substantially," "about," and the like are used as terms of a table approximation, not as terms of a table level, and are intended to illustrate inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
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.
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 herein as the object side, and the surface of each lens closest to the imaging plane is referred to herein as the image side.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The present application is further described below in connection with specific embodiments.
An optical imaging lens assembly according to an exemplary embodiment of the present application includes a cover lens and a lens assembly, wherein the lens assembly includes a first lens, a second lens, and a plurality of subsequent lenses. The number of subsequent lenses is an integer equal to or greater than zero. The cover lens and the lens group are arranged in order from the object side to the image side along the optical axis.
In an exemplary embodiment, the cover lens optionally may have positive or negative optical power, with its object side being planar; the first lens in the lens group may have positive optical power; and the second lens in the lens group may have negative optical power. By reasonably controlling the positive and negative focal power distribution of each lens, the low-order aberration of the control system can be effectively balanced, so that the optical image lens group obtains better imaging quality, and the characteristic of high pixels can be realized.
In an exemplary embodiment, the effective focal length f of the optical image lens assembly and the effective focal length f1 of the first lens may satisfy: 0.5< f/f1<1.5, specifically, 0.92.ltoreq.f1.ltoreq.1.30 may be further satisfied. The focal power of the first lens is positive, the effect of collecting light can be born in the optical system, the ratio is controlled within a proper range, the spherical aberration contribution of the first lens is reduced, and the chromatic aberration can be better optimized by matching with other lenses.
In an exemplary embodiment, the effective focal length f of the optical imaging lens assembly and the effective focal length f of the cover lens TP The method can meet the following conditions: i f/f TP |<0.5, in particular, 0.03.ltoreq.f/f TP The I is less than or equal to 0.29. The ratio is controlled within a reasonable range, the focal power distribution of the cover lens in the whole optical system can be limited, the bending force of the cover lens is controlled, the sensitivity of the cover lens is reduced, in addition, the plano-concave spherical lens can restrict the thickness ratio of the lens by controlling the focal power, and the lens processing and system assembly are facilitated.
In an exemplary embodiment, the effective focal length f2 of the second lens and the effective focal length f of the overlay lens TP The method can meet the following conditions: 0<|f2/f TP |<1, in particular, can further satisfy 0.08 +.f2/f TP The I is less than or equal to 0.52. The first lens of the system is a system light collecting lens, the focal power ratio of the covering lens and the second lens is limited by the condition, and the covering lens and the second lens are restrained in a proper range, so that light can be smoothly collected, and the influence of abnormal reflected light on the imaging quality of the optical system is avoided.
In an exemplary embodiment, an effective half-caliber D of the object side surface of the cover lens TP1 The following conditions are satisfied between the optical imaging lens group and the entrance pupil diameter EPD: 0.5<D TP1 /EPD<2.5, in particular, 0.86.ltoreq.D may be further satisfied TP1 EPD is less than or equal to 2.26. Under the condition of the same incidence angle, the smaller the caliber is, the smaller the total length is, and the satisfaction of the conditional expression can be beneficial to the realization of the miniaturization design of the optical system. The larger the caliber and the larger the thickness ratio of the spherical lens under the condition of the determined curvature radius, thereby increasing the processing difficulty of the process, and the constraint condition can also have the effect of reducing the processing cost.
In an exemplary embodiment, the effective focal length f of the optical image group and the image of the overlay lensRadius of curvature R of side surface TP2 The method can meet the following conditions: i f/R TP2 |<1, in particular, can further satisfy 0.06.ltoreq.f/R TP2 The I is less than or equal to 0.55. The condition can ensure that the ratio of the curvature radius of the image side surface of the cover lens to the focal length of the system is in a certain range, so that off-axis light rays have smaller refractive angles, and the contribution ratio of spherical aberration of the cover lens in the whole optical system is reduced.
In an exemplary embodiment, the effective focal length f of the optical image lens assembly and the effective focal length f2 of the second lens may satisfy: 1<f/f2<0, in particular, -0.79 < f/f2< 0.14 can be further satisfied. The second lens focal power is a negative value, so that distribution of system focal power can be facilitated, system spherical aberration is optimized, aberration equalization is facilitated when the first lens is matched, and imaging quality is improved.
In an exemplary embodiment, the curvature radius R4 of the image side of the second lens and the curvature radius R1 of the object side of the first lens may satisfy: (R4-R1)/(R4+R1) | <2.5, specifically, 0.12.ltoreq.I (R4-R1)/(R4+R1) |.ltoreq.2.29 may be further satisfied. The conditional expression is controlled in a proper range, so that the light rays have smaller divergence angles, and the miniaturization design of the system is facilitated; and the smooth transition of the light rays among the lens groups is beneficial to realizing the uniformity of the image quality of the imaging surface.
In an exemplary embodiment, the air space T on the optical axis of the cover lens and the first lens TP The following conditions are satisfied between the optical imaging lens group and the entrance pupil diameter EPD: 0<T TP /EPD<1.6, in particular, 0.11.ltoreq.T may be further satisfied TP /EPD≤1.54。T TP To cover the air gap between the lens and the lens group on the optical axis, it is sensitive to system curvature. The conditional expression is controlled in a proper range, which is favorable for balancing the imaging difference between the central view field and the off-axis view field, and the field curvature of the system is optimized.
In an exemplary embodiment, the conditional expression may be satisfied: 1<f/(CT TP +T TP )<5, in particular, 1.20.ltoreq.f/(CT) TP +T TP ) Less than or equal to 4.96, wherein f is the effective focal length of the optical image lens group; CT (computed tomography) TP To cover the center thickness of the lens; T is as follows TP Covering the air space between the lens and the first lens on the optical axis. CT (computed tomography) TP And T is TP The sum is the total length of the front cover lens, and the conditional expression is controlled in a proper range, so that the miniaturization design of the system can be facilitated.
In an exemplary embodiment, the center thickness CT of the overlay lens TP And the center thickness CT2 of the second lens can meet the following conditions: 0<CT TP /CT2<4, in particular, 0.26.ltoreq.CT can be further satisfied TP CT2 is less than or equal to 3.57. The central thickness of the covering lens has obvious influence on the system field curvature, the central thickness of the second lens has great contribution on the system field curvature and the coma aberration, and the conditional expression is controlled in a proper ratio range, so that the image quality uniformity of the image plane can be balanced.
In an exemplary embodiment, the optical imaging lens group may further be provided with an aperture STO for restricting the light beam, adjusting the amount of light entering, and improving the imaging quality.
Optionally, the optical imaging lens set may further include a protective glass for protecting the photosensitive element located on the imaging surface.
The optical imaging lens set according to the above embodiment of the present application may employ a plurality of lenses, such as three, four, five, six, seven and eight lenses described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, the miniaturization of the lens, the aberration of a balance system and the imaging quality can be effectively ensured, so that the optical image lens group is more beneficial to production and processing and is applicable to portable electronic products.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, has advantages of improving distortion aberration and improving astigmatic aberration, and can make the field of view larger and more realistic. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. In addition, the use of aspherical lenses can also effectively reduce the number of lenses in the optical system.
Therefore, according to the optical image lens group of the embodiment of the application, the front cover protection glass of the mobile phone is redefined as the cover lens, and the combination effect between the addition of the new lens and the current gradually mature glass lens processing technology can provide a wider product design thought for the lens design processing field and equipment terminal manufacturers and provide more volatile space for the diversification of the functions of terminal products. The optical image lens group has the same even better application space for the fields of high-end imaging systems (4-piece, 5-piece, 6-piece, 7-piece lenses) and the like besides being applied to a lower-end imaging system.
However, those skilled in the art will appreciate that the number of lenses making up a lens barrel may be varied to achieve the various results and advantages described in the specification without departing from the technical solutions claimed herein. For example, the optical imaging system may also include other numbers of lenses, if desired.
Specific examples of optical imaging lens assemblies applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging lens set according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D.
Fig. 1 shows a schematic structural diagram of an optical imaging lens assembly according to embodiment 1 of the present application. As shown in fig. 1, the optical image lens assembly includes a cover lens E1 and a lens assembly arranged in order from an object side to an imaging side along an optical axis. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2 and a second lens E3, wherein the first lens E2 has an object side surface S3 and an image side surface S4; and the second lens E3 has an object side surface S5 and an image side surface S6.
In this embodiment, the cover lens E1 has positive optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; and the second lens E3 has negative optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 1 may include a filter E4 having an object side surface S7 and an image side surface S8, and the filter E4 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 1 shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 1.
TABLE 1
Figure BDA0001663409450000091
In the embodiment, three lenses are taken as an example, and the miniaturization of the lens is ensured by reasonably distributing the focal length and the surface shape of each lens and selecting proper materials; meanwhile, various aberrations are corrected, the sensitivity is reduced, and the resolution and imaging quality of the lens are improved. Each aspherical surface profile x is defined by the following formula:
Figure BDA0001663409450000092
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 above); ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order term coefficients A for each of the mirrors S2-S6 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 And A 20 。
TABLE 2
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S2 -6.5880E-02 1.4377E-01 -1.4879E-01 7.8929E-02 -1.6620E-02 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 3.5217E-01 -3.3380E-02 -8.8807E-01 1.6631E+01 5.7724E+00 -2.2677E+02 1.5986E+02 -8.5043E+00 -9.8071E-06
S4 3.6969E-01 2.0991E+00 -6.8526E+00 1.4007E+00 1.8152E+02 -2.4653E+02 -5.2312E+02 -9.8000E-07 -9.6790E-07
S5 -3.6673E-01 -3.2022E-01 -6.8698E+00 5.2919E+01 -1.3780E+02 6.3036E+01 1.2149E+02 1.9542E+02 -4.2568E+02
S6 -6.5420E-02 -2.9331E-01 7.5931E-01 -1.3591E+00 1.2956E+00 -4.5824E-01 -1.8036E-01 1.8604E-01 -3.8929E-02
Table 3 below shows the effective focal length f of each lens of example 1 TP F1 and f2, the effective focal length f of the optical image lens assembly, the distance on the optical axis TTL from the object side surface S1 of the cover lens E1 to the imaging surface S9 of the optical image lens assembly (i.e., the total optical length of the optical image lens assembly), the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly.
TABLE 3 Table 3
f TP (mm) 8.03 f(mm) 2.30
f1(mm) 2.45 TTL(mm) 3.66
f2(mm) -4.16 HFOV(°) 30.8
Fno 2.46
In this example, in combination with tables 1 and 3 above:
effective focal length f of optical image lens assembly and effective focal length f of covering lens E1 TP Satisfy |f/f TP |＝0.29；
In one embodiment, f1=0.94 is satisfied between the effective focal length f of the optical image lens assembly and the effective focal length f1 of the first lens E2;
in one embodiment, the air space T on the optical axis of the cover lens E1 and the first lens E2 TP Satisfy T with the entrance pupil diameter EPD of the optical image lens group TP /EPD＝1.02；
In one embodiment, the effective focal length f of the optical image group and the radius of curvature R of the image side S2 of the cover lens E1 TP2 Meeting |f/R TP2 |＝0.55；
In one embodiment, the effective focal length f of the optical image lens assembly and the effective focal length f2 of the second lens element E3 satisfy ff2= -0.55;
in one embodiment, the effective half-caliber D of the object side S1 of the cover lens E1 TP1 Satisfy D with the entrance pupil diameter EPD of the optical image lens group TP1 /EPD＝1.36；
In one embodiment, the curvature radius R4 of the image side surface S6 of the second lens element E3 and the curvature radius R1 of the object side surface S3 of the first lens element E2 satisfy | (R4-R1)/(r4+r1) | < 25=0.65.
In one embodiment, the effective focal length f2 of the second lens E3 and the effective focal length f of the cover lens E1 TP Meeting |f2/f TP |＝0.52；
In one embodiment, f/(CT) is satisfied TP +T TP ) =1.78, where f is the effective focal length of the optical imaging lens group; CT (computed tomography) TP A center thickness for covering the lens E1; t is as follows TP Is covered byAn air space on the optical axis of the cover lens E1 and the first lens E2; and
in one embodiment, the center thickness CT of the cover lens E1 TP CT is satisfied between the second lens E3 and the center thickness CT2 TP /CT2＝0.39。
Fig. 2A shows an on-axis chromatic aberration curve of the optical imaging lens set of embodiment 1, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens set. 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 a distortion curve of the optical imaging lens set of embodiment 1, which represents distortion magnitude values at different viewing angles. Fig. 2D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 1, which represents the deviation of different image heights of light rays on the imaging plane after passing through the optical imaging lens set. As can be seen from fig. 2A to 2D, the optical imaging lens set of embodiment 1 can achieve good imaging quality.
Example 2
An optical imaging lens set according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. The optical imaging lens set described in this embodiment 2 and the following embodiments is identical to the arrangement structure of the optical imaging lens set described in embodiment 1 except for parameters of each lens of the optical imaging lens set, for example, the radius of curvature, thickness, conic coefficient, effective focal length, on-axis distance, higher order coefficient of each lens, and the like of each lens. For brevity, descriptions of portions similar to those of embodiment 1 will be omitted.
Fig. 3 shows a schematic structural diagram of an optical imaging lens set according to embodiment 2 of the present application. As shown in fig. 3, the optical imaging lens group according to embodiment 2 includes a cover lens E1 and a lens group. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2 and a second lens E3, wherein the first lens E2 has an object side surface S3 and an image side surface S4; and the second lens E3 has an object side surface S5 and an image side surface S6.
In this embodiment, the cover lens E1 has negative optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; and the second lens E3 has negative optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 2 may include a filter E4 having an object side surface S7 and an image side surface S8, and the filter E4 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S8 and is finally imaged on the imaging surface S9.
Table 4 below shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 2. Table 5 shows the higher order coefficients of the aspherical mirror surfaces in example 2. Table 6 shows the effective focal length f of each lens of example 2 TP F1 and f2, the effective focal length f of the optical image lens assembly, the distance on the optical axis TTL from the object side surface S1 of the cover lens E1 to the imaging surface S9 of the optical image lens assembly (i.e., the total optical length of the optical image lens assembly), the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly. Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 4 Table 4
Figure BDA0001663409450000121
TABLE 5
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S2 1.3928E-02 -3.3000E-03 5.1300E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 -3.3750E-02 5.0397E+00 -1.2309E+02 1.8296E+03 -1.6936E+04 9.8544E+04 -3.5020E+05 6.9416E+05 -5.8792E+05
S4 -2.7150E-02 3.0851E+00 -5.2671E+01 5.3057E+02 -3.1997E+03 1.1622E+04 -2.4472E+04 2.6952E+04 -1.1743E+04
S5 8.6390E-03 -1.1005E+00 5.5084E+00 -1.9249E+01 4.4377E+01 -6.5523E+01 5.9044E+01 -2.9444E+01 6.1933E+00
S6 2.0840E-01 -8.0005E-01 1.3166E+00 -1.3747E+00 9.4070E-01 -4.2098E-01 1.1846E-01 -1.8990E-02 1.3210E-03
TABLE 6
Figure BDA0001663409450000122
Figure BDA0001663409450000131
Fig. 4A shows an on-axis chromatic aberration curve of the optical imaging lens set of embodiment 2, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens set. 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 set of example 2, which represents the magnitude of distortion at different viewing angles. Fig. 4D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 2, which represents the deviation of different image heights of light rays on the imaging plane after passing through the optical imaging lens set. As can be seen from fig. 4A to 4D, the optical imaging lens set of embodiment 2 can achieve good imaging quality.
Example 3
An optical imaging lens set according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D.
Fig. 5 shows a schematic structural diagram of an optical imaging lens set according to embodiment 3 of the present application. As shown in fig. 5, the optical imaging lens group according to embodiment 3 includes a cover lens E1 and a lens group. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2, a second lens E3 and a third lens E4, wherein the first lens E2 has an object side surface S3 and an image side surface S4; the second lens E3 has an object side surface S5 and an image side surface S6; and the third lens E4 has an object side surface S7 and an image side surface S8.
In this embodiment, the cover lens E1 has positive optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; the second lens E3 has negative optical power; and the third lens E4 has positive optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 3 may include a filter E5 having an object side surface S9 and an image side surface S10, and the filter E5 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 7 below shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 3. Table 8 shows the higher order coefficients of the aspherical mirror surfaces in example 3. Table 9 shows the effective focal length f of each lens of example 3 TP F1 to f3, the effective focal length f of the optical image lens assembly, the distance TTL (i.e., the total optical length of the optical image lens assembly) between the object side surface S1 of the cover lens E1 and the imaging surface S11 of the optical image lens assembly on the optical axis, the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly. Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 7
Figure BDA0001663409450000141
TABLE 8
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 -2.2960E-01 2.7830E-01 2.4014E-01 -1.0790E+01 -6.5900E+01 2.0925E+02 3.1693E+03 -1.1261E+04 2.3800E-13
S4 -3.4989E-01 -3.3380E-01 1.1902E+00 -1.5625E-01 -2.7837E+00 1.8519E-01 8.5567E+00 -8.1757E+00 2.1500E-13
S5 -1.9629E-01 8.4640E-02 -6.3751E-02 5.9336E-02 8.4880E-03 -1.9410E-02 -6.5900E-03 4.9520E-03 3.5300E-05
S6 1.4804E-01 -1.9141E-01 9.8986E-02 -7.6600E-03 -6.2300E-03 -1.3400E-03 4.7740E-03 -3.6400E-03 6.8700E-04
S7 -7.9990E-02 4.7118E-01 -1.8821E-01 -9.1460E-02 3.9592E-02 2.6995E-02 -2.7800E-03 -7.9400E-03 1.7210E-03
S8 -1.1382E-01 1.0280E-01 -6.5168E-02 4.7589E-02 1.3468E-02 -8.1200E-03 -4.8700E-03 5.9000E-04 5.2000E-04
TABLE 9
f TP (mm) 29.30 f(mm) 1.81
f1(mm) 1.40 TTL(mm) 5.18
f2(mm) -2.28 HFOV(°) 45.0
f3(mm) 2.07 Fno 2.00
Fig. 6A shows an on-axis chromatic aberration curve of the optical imaging lens set of embodiment 3, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens set. 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 set of example 3, which represents the magnitude of distortion at different viewing angles. Fig. 6D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 6A to 6D, the optical imaging lens set of embodiment 3 can achieve good imaging quality.
Example 4
An optical imaging lens set according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D.
Fig. 7 shows a schematic structural diagram of an optical imaging lens set according to embodiment 4 of the present application. As shown in fig. 7, the optical imaging lens group according to embodiment 4 includes a cover lens E1 and a lens group. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2, a second lens E3 and a third lens E4, wherein the first lens E2 has an object side surface S3 and an image side surface S4; the second lens E3 has an object side surface S5 and an image side surface S6; and the third lens E4 has an object side surface S7 and an image side surface S8.
In this embodiment, the cover lens E1 has negative optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; the second lens E3 has negative optical power; and the third lens E4 has positive optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 4 may include a filter E5 having an object side surface S9 and an image side surface S10, and the filter E5 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 10 below shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 4. Table 11 shows the higher order coefficients of the aspherical mirror surfaces in example 4. Table 12 shows example 4Effective focal length f of each lens of (2) TP F1 to f3, the effective focal length f of the optical image lens assembly, the distance TTL (i.e., the total optical length of the optical image lens assembly) between the object side surface S1 of the cover lens E1 and the imaging surface S11 of the optical image lens assembly on the optical axis, the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly. Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
Table 10
Figure BDA0001663409450000161
/>
TABLE 11
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 1.2872E-01 -5.7413E-01 -4.2996E-01 2.5411E+00 -1.6974E+00 -1.2860E+01 1.8936E+01 -3.7190E-02 2.3400E-11
S4 -1.7121E-01 -1.4059E-01 1.2124E-01 -3.0815E-01 3.2744E-01 5.3066E-01 -8.5159E-01 -2.2655E+00 3.1285E+00
S5 2.3718E-01 4.7189E-01 -1.7130E-01 -2.0080E-01 -1.9100E-03 1.0270E-01 7.7891E-02 -3.5480E-02 -3.4990E-02
S6 4.0091E-01 2.5497E-01 -1.2783E-01 -1.6500E-02 4.9795E-02 2.4917E-02 -1.9630E-02 -2.5260E-02 3.7456E-02
S7 1.4559E-02 5.5830E-02 -1.2287E-01 5.0050E-02 5.9795E-02 -8.2640E-02 1.7668E-02 2.0148E-02 -9.1000E-03
S8 -4.0150E-02 1.5110E-01 -1.6113E-01 5.7770E-02 8.0380E-03 -1.3850E-02 2.0610E-03 2.1590E-03 -7.9000E-04
Table 12
f TP (mm) -22.61 f(mm) 2.40
f1(mm) 2.21 TTL(mm) 5.50
f2(mm) -5.95 HFOV(°) 37.0
f3(mm) 4.99 Fno 2.00
Fig. 8A shows an on-axis chromatic aberration curve of the optical imaging lens set of example 4, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens set. 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 set of example 4, which represents the magnitude of distortion at different viewing angles. Fig. 8D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 4, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging lens set. As can be seen from fig. 8A to 8D, the optical imaging lens set of embodiment 4 can achieve good imaging quality.
Example 5
An optical imaging lens set according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D.
Fig. 9 shows a schematic structural diagram of an optical imaging lens set according to embodiment 5 of the present application. As shown in fig. 9, the optical imaging lens group according to embodiment 5 includes a cover lens E1 and a lens group. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2, a second lens E3, a third lens E4 and a fourth lens E5, wherein the first lens E2 has an object side surface S3 and an image side surface S4; the second lens E3 has an object side surface S5 and an image side surface S6; the third lens element E4 has an object-side surface S7 and an image-side surface S8; and the fourth lens E5 has an object side surface S9 and an image side surface S10.
In this embodiment, the cover lens E1 has negative optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; the second lens E3 has negative optical power; the third lens E4 has positive optical power; and the fourth lens E5 has negative optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 5 may include a filter E6 having an object side surface S11 and an image side surface S12, and the filter E6 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 13 below shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 5. Table 14 shows the higher order coefficients of the aspherical mirror surfaces in example 5. Table 15 shows the effective focal length f of each lens of example 5 TP F1 to f4, the effective focal length f of the optical image lens assembly, the distance TTL (i.e., the total optical length of the optical image lens assembly) between the object side surface S1 of the cover lens E1 and the imaging surface S13 of the optical image lens assembly on the optical axis, the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly. Wherein each aspheric surface can be formed by the above-mentioned solidThe formula (1) given in example 1 is defined.
TABLE 13
Figure BDA0001663409450000181
TABLE 14
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 3.3320E-01 -4.4907E-01 -8.2884E-01 1.4856E+01 -8.3739E+01 2.6726E+02 -5.0385E+02 5.2198E+02 -2.2970E+02
S4 -1.1506E-01 -5.0522E-01 5.3926E+00 -4.4859E+01 2.1930E+02 -6.6258E+02 1.2030E+03 -1.1973E+03 5.0023E+02
S5 -3.8572E-01 2.7388E-01 -6.1959E+00 4.4425E+01 -2.0700E+02 6.0247E+02 -1.0680E+03 1.0590E+03 -4.4669E+02
S6 -8.6800E-03 -3.0775E-01 9.5836E-01 -2.0939E+00 2.6479E+00 -1.6827E+00 2.4557E-01 2.7064E-01 -8.6100E-02
S7 9.5955E-02 -1.3649E-01 5.0414E-01 -6.2946E-01 -3.2520E-01 1.6846E+00 -1.8648E+00 9.1966E-01 -1.7487E-01
S8 -3.7196E-01 7.3818E-01 -1.6285E+00 3.2617E+00 -4.7224E+00 4.6385E+00 -2.8054E+00 9.2044E-01 -1.2456E-01
S9 -5.2070E-02 -7.1384E-01 1.9808E+00 -3.0649E+00 3.0428E+00 -1.9498E+00 7.7745E-01 -1.7497E-01 1.6913E-02
S10 -1.9369E-01 1.6962E-01 -9.9090E-02 3.1176E-02 -7.7000E-04 -3.2400E-03 1.1790E-03 -1.8000E-04 1.0400E-05
TABLE 15
f TP (mm) -64.32 f(mm) 2.83
f1(mm) 3.09 TTL(mm) 5.53
f2(mm) -5.43 HFOV(°) 40.3
f3(mm) 1.49 Fno 2.07
f4(mm) -1.54
Fig. 10A shows an on-axis chromatic aberration curve of the optical imaging lens set of example 5, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens set. 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 set of example 5, which represents the magnitude of distortion at different viewing angles. Fig. 10D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 5, which represents the deviation of different image heights on the imaging plane after the light passes through the optical imaging lens set. As can be seen from fig. 10A to 10D, the optical imaging lens set of embodiment 5 can achieve good imaging quality.
Example 6
An optical imaging lens set according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D.
Fig. 11 shows a schematic structural diagram of an optical imaging lens set according to embodiment 6 of the present application. As shown in fig. 11, the optical imaging lens group according to embodiment 6 includes a cover lens E1 and a lens group. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2, a second lens E3, a third lens E4, a fourth lens E5 and a fifth lens E6, wherein the first lens E2 has an object side surface S3 and an image side surface S4; the second lens E3 has an object side surface S5 and an image side surface S6; the third lens element E4 has an object-side surface S7 and an image-side surface S8; the fourth lens element E5 has an object-side surface S9 and an image-side surface S10; and the fifth lens element E6 has an object-side surface S11 and an image-side surface S12.
In this embodiment, the cover lens E1 has negative optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; the second lens E3 has negative optical power; the third lens E4 has negative optical power; the fourth lens E5 has positive optical power; and the fifth lens E6 has negative optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 6 may include a filter E7 having an object side surface S13 and an image side surface S14, and the filter E7 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S14 and is finally imaged on the imaging surface S15.
Table 16 below shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 6. Table 17 shows the higher order coefficients of the aspherical mirror surfaces in example 6. Table 18 shows the effective focal length f of each lens of example 6 TP F1 to f5, the effective focal length f of the optical image lens assembly, the distance TTL (i.e., the total optical length of the optical image lens assembly) between the object side surface S1 of the cover lens E1 and the imaging surface S15 of the optical image lens assembly on the optical axis, the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly. Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
Table 16
Figure BDA0001663409450000201
TABLE 17
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 7.5590E-03 -4.3390E-02 2.8253E-01 -9.4091E-01 1.7833E+00 -2.0584E+00 1.4180E+00 -5.5247E-01 8.5917E-02
S4 5.3274E-02 1.1366E-02 -3.2313E-01 5.8869E-01 -4.4141E-01 -2.5878E-01 6.7503E-01 -4.3621E-01 9.3704E-02
S5 -1.3000E-04 9.0101E-02 -3.5919E-01 3.9645E-01 9.6354E-02 -8.4050E-01 9.5577E-01 -4.2830E-01 6.3337E-02
S6 -2.0174E-01 3.4691E-01 -8.8821E-01 2.2814E+00 -4.5046E+00 6.0642E+00 -5.1161E+00 2.4763E+00 -5.1332E-01
S7 -2.8896E-01 3.4552E-02 -5.1070E-02 -3.6540E-02 8.3856E-02 5.1400E-04 7.0800E-04 -2.4000E-05 -1.6000E-05
S8 -1.3468E-01 -6.4500E-03 9.2880E-03 1.4604E-02 -4.0200E-03 -4.1000E-06 2.9300E-04 -6.7000E-06 -1.6000E-05
S9 1.1635E-02 -1.0690E-02 2.7429E-02 -1.2360E-02 2.1860E-03 1.7100E-04 -3.6000E-05 -5.4000E-05 1.5600E-05
S10 3.9337E-02 -4.7600E-02 1.2145E-02 8.7760E-03 -2.7100E-03 2.8700E-04 5.3400E-05 -5.6000E-06 -1.4000E-05
S11 -9.0920E-02 1.0986E-02 2.7700E-03 -6.2000E-04 -3.0000E-05 7.4600E-06 1.6600E-06 2.5500E-07 -8.8000E-08
S12 -7.5010E-02 2.3111E-02 -4.8300E-03 4.1800E-04 4.0000E-06 -2.1000E-06 -1.9000E-07 3.7900E-09 4.1400E-09
TABLE 18
f TP (mm) -12.75 f(mm) 2.88
f1(mm) 2.41 TTL(mm) 5.45
f2(mm) -6.25 HFOV(°) 42.0
f3(mm) -9.28 Fno 1.70
f4(mm) 1.97
f5(mm) -2.99
Fig. 12A shows an on-axis chromatic aberration curve of the optical imaging lens set of example 6, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens set. Fig. 12B shows an astigmatism curve of the optical imaging lens group of example 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the optical imaging lens set of example 6, which represents the magnitude of distortion at different viewing angles. Fig. 12D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 6, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 12A to 12D, the optical imaging lens set of embodiment 6 can achieve good imaging quality.
Example 7
An optical imaging lens set according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D.
Fig. 13 shows a schematic structural diagram of an optical imaging lens set according to embodiment 7 of the present application. As shown in fig. 13, the optical imaging lens group according to embodiment 7 includes a cover lens E1 and a lens group. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2, a second lens E3, a third lens E4, a fourth lens E5, a fifth lens E6 and a sixth lens E7, wherein the first lens E2 has an object side surface S3 and an image side surface S4; the second lens E3 has an object side surface S5 and an image side surface S6; the third lens element E4 has an object-side surface S7 and an image-side surface S8; the fourth lens element E5 has an object-side surface S9 and an image-side surface S10; the fifth lens element E6 has an object-side surface S11 and an image-side surface S12; and the sixth lens E7 has an object side surface S13 and an image side surface S14.
In this embodiment, the cover lens E1 has negative optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; the second lens E3 has negative optical power; the third lens E4 has positive optical power; the fourth lens E5 has negative optical power; the fifth lens E6 has positive optical power; and the sixth lens E7 has negative optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 7 may include a filter E8 having an object side surface S15 and an image side surface S16, and the filter E8 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17.
Table 19 below shows the surface classes of the lenses of the optical imaging lens set of example 7Radius of curvature, thickness, material, and conic coefficient. Table 20 shows the higher order coefficients of the aspherical mirror surfaces in example 7. Table 21 shows the effective focal length f of each lens of example 7 TP F1 to f6, the effective focal length f of the optical image lens assembly, the distance TTL (i.e., the total optical length of the optical image lens assembly) between the object side surface S1 of the cover lens E1 and the imaging surface S17 of the optical image lens assembly on the optical axis, the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly. Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 19
Figure BDA0001663409450000221
Figure BDA0001663409450000231
Table 20
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 7.8162E-02 -1.7290E-02 6.9907E-02 -1.9298E-01 3.4376E-01 -3.8804E-01 2.6470E-01 -1.0048E-01 1.5456E-02
S4 -1.1917E-01 1.6532E-01 -2.3008E-01 3.3650E-01 -4.5801E-01 4.3071E-01 -2.5213E-01 8.2495E-02 -1.1770E-02
S5 -1.3889E-01 2.0091E-01 -2.2868E-01 5.8530E-01 -1.3899E+00 2.0449E+00 -1.7597E+00 8.3015E-01 -1.6592E-01
S6 -7.5900E-02 1.6987E-01 -1.7660E-01 5.7478E-01 -1.6024E+00 2.6787E+00 -2.4174E+00 1.0427E+00 -1.1503E-01
S7 -8.3000E-02 -8.6970E-02 5.1848E-01 -2.8362E+00 8.5013E+00 -1.5416E+01 1.6673E+01 -9.9157E+00 2.5128E+00
S8 -9.8820E-02 5.2412E-02 -1.5387E-01 8.0187E-02 2.6772E-01 -6.9188E-01 7.4495E-01 -4.0091E-01 8.8991E-02
S9 -1.9849E-01 2.8049E-01 -2.3578E-01 2.6768E-02 5.9147E-01 -1.1144E+00 9.3486E-01 -3.9021E-01 6.5957E-02
S10 -2.6025E-01 2.9932E-01 -2.7140E-01 2.4951E-01 -9.9910E-02 -3.9340E-02 5.2064E-02 -1.8150E-02 2.2380E-03
S11 -1.1975E-01 1.4464E-02 1.7265E-02 -4.7350E-02 5.5509E-02 -3.5990E-02 1.3061E-02 -2.4600E-03 1.8700E-04
S12 -2.9240E-02 5.4480E-03 -2.3420E-02 1.9205E-02 -7.7900E-03 1.6180E-03 -1.3000E-04 -4.4000E-06 9.3900E-07
S13 -3.1848E-01 1.9592E-01 -8.7510E-02 2.2684E-02 -2.0500E-03 -4.2000E-04 1.3200E-04 -1.3000E-05 4.9400E-07
S14 -1.5325E-01 9.9088E-02 -4.7840E-02 1.5969E-02 -3.7000E-03 5.9100E-04 -6.2000E-05 3.7300E-06 -9.8000E-08
Table 21
f TP (mm) -64.32 f(mm) 4.10
f1(mm) 3.45 TTL(mm) 5.68
f2(mm) -9.39 HFOV(°) 36.0
f3(mm) 13.96 Fno 1.85
f4(mm) -12.73
f5(mm) 9.91
f6(mm) -6.07
Fig. 14A shows an on-axis chromatic aberration curve of the optical imaging lens set of example 7, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the optical imaging lens set. 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 set of example 7, which represents the magnitude of distortion at different viewing angles. Fig. 14D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 7, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 14A to 14D, the optical imaging lens set of embodiment 7 can achieve good imaging quality.
Example 8
An optical imaging lens set according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D.
Fig. 15 shows a schematic structural diagram of an optical imaging lens set according to embodiment 8 of the present application. As shown in fig. 15, the optical imaging lens group according to embodiment 8 includes a cover lens E1 and a lens group. The cover lens E1 has an object side surface S1 and an image side surface S2; the lens group comprises a first lens E2, a second lens E3, a third lens E4, a fourth lens E5, a fifth lens E6, a sixth lens E7 and a seventh lens E8, wherein the first lens E2 has an object side surface S3 and an image side surface S4; the second lens E3 has an object side surface S5 and an image side surface S6; the third lens element E4 has an object-side surface S7 and an image-side surface S8; the fourth lens element E5 has an object-side surface S9 and an image-side surface S10; the fifth lens element E6 has an object-side surface S11 and an image-side surface S12; the sixth lens element E7 has an object-side surface S13 and an image-side surface S14; and the seventh lens E8 has an object side surface S15 and an image side surface S16.
In this embodiment, the cover lens E1 has negative optical power, and its object side S1 is a plane; the first lens E2 has positive optical power; the second lens E3 has negative optical power; the third lens E4 has positive optical power; the fourth lens E5 has negative optical power; the fifth lens E6 has negative optical power; the sixth lens E7 has positive optical power; and the seventh lens E8 has negative optical power.
In the optical imaging lens group of the present embodiment, an aperture stop provided between the cover lens E1 and the first lens E2 for restricting the light beam is further included. The optical imaging lens set according to embodiment 8 may include a filter E9 having an object side surface S17 and an image side surface S18, and the filter E9 may be used to correct color deviation. Light from the object sequentially passes through the respective surfaces S1 to S18 and is finally imaged on the imaging surface S19.
Table 22 below shows the surface types, radii of curvature, thicknesses, materials, and conic coefficients of the respective lenses of the optical imaging lens group of example 8. Table 23 shows the higher order coefficients of the aspherical mirror surfaces in example 8. Table 24 shows the effective focal length f of each lens of example 8 TP F1 to f7, the effective focal length f of the optical image lens assembly, the distance TTL on the optical axis from the object side surface S1 of the cover lens E1 to the imaging surface S19 of the optical image lens assembly (i.e., the total optical length of the optical image lens assembly), the maximum half field angle HFOV of the optical image lens assembly, and the f-number Fno of the optical image lens assembly. Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
Table 22
Figure BDA0001663409450000251
Table 23
Face number A4 A6 A8 A10 A12 A14 A16 A18 A20
S3 7.9409E-02 -1.2930E-02 6.2579E-02 -2.0611E-01 4.2897E-01 -5.4794E-01 4.1435E-01 -1.7139E-01 2.8724E-02
S4 -1.0666E-01 1.4957E-01 -2.3428E-01 4.0780E-01 -6.3048E-01 6.4141E-01 -3.9677E-01 1.3536E-01 -1.9740E-02
S5 -1.2563E-01 1.6652E-01 -2.2463E-01 6.8859E-01 -1.6360E+00 2.3584E+00 -1.9968E+00 9.3076E-01 -1.8432E-01
S6 -6.1750E-02 1.4066E-01 -3.9630E-01 1.8558E+00 -5.3703E+00 9.4661E+00 -9.8234E+00 5.5339E+00 -1.2732E+00
S7 -6.8960E-02 -2.8100E-02 -2.7474E-01 9.3307E-01 -2.0631E+00 3.1240E+00 -3.0484E+00 1.7200E+00 -4.1636E-01
S8 -4.8000E-03 1.5120E-01 -6.7912E-01 9.8277E-01 -8.0860E-02 -1.2631E+00 1.4161E+00 -6.1465E-01 8.8011E-02
S9 -3.5670E-02 2.9575E-01 -1.0321E+00 1.7077E+00 -1.2026E+00 -1.1424E-01 7.2241E-01 -4.3084E-01 8.7682E-02
S10 -1.1727E-01 1.9200E-01 -4.2815E-01 3.8357E-01 -1.8400E-02 -2.5837E-01 2.6836E-01 -1.4590E-01 3.5710E-02
S11 -1.7380E-01 2.4251E-01 -2.5480E-02 -7.3191E-01 1.6266E+00 -1.6349E+00 8.6857E-01 -2.4051E-01 2.7992E-02
S12 -2.4691E-01 2.6261E-01 -7.6650E-02 -2.7612E-01 6.0594E-01 -5.6257E-01 2.7230E-01 -6.7640E-02 6.8510E-03
S13 -1.3645E-01 2.2495E-02 3.8552E-02 -9.7890E-02 1.0801E-01 -6.7190E-02 2.3798E-02 -4.4400E-03 3.3700E-04
S14 -2.4580E-02 -2.1710E-02 1.7597E-02 -1.5770E-02 1.0584E-02 -4.4600E-03 1.0890E-03 -1.4000E-04 7.1800E-06
S15 -3.2344E-01 1.8928E-01 -8.2430E-02 2.0148E-02 -1.2500E-03 -5.5000E-04 1.4200E-04 -1.4000E-05 4.8600E-07
S16 -1.6847E-01 1.1300E-01 -5.7620E-02 2.0480E-02 -5.0700E-03 8.6400E-04 -9.6000E-05 6.1400E-06 -1.7000E-07
Table 24
Figure BDA0001663409450000252
/>
Figure BDA0001663409450000261
Fig. 16A shows an on-axis chromatic aberration curve of the optical imaging lens set of example 8, which indicates the deviation of the converging focus of light rays of different wavelengths after passing through the optical imaging lens set. 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 set of example 8, which represents the magnitude of distortion at different viewing angles. Fig. 16D shows a magnification chromatic aberration curve of the optical imaging lens set of embodiment 8, which represents the deviation of different image heights on the imaging plane after light passes through the optical imaging lens set. As can be seen from fig. 16A to 16D, the optical imaging lens set of embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 25 below.
Table 25
Condition/example 1 2 3 4 5 6 7 8
|f/f TP | 0.29 0.03 0.06 0.11 0.04 0.23 0.06 0.06
f/f1 0.94 0.98 1.30 1.09 0.92 1.20 1.19 1.20
|f/R TP2 | 0.55 0.06 0.12 0.20 0.08 0.44 0.12 0.12
f/f2 -0.55 -0.14 -0.79 -0.40 -0.52 -0.46 -0.44 -0.46
D TP1 /EPD 1.36 1.50 2.26 1.41 1.14 0.93 0.86 0.90
|(R4-R1)/(R4+R1)| 0.65 0.45 2.29 1.84 0.51 0.12 0.28 0.28
T TP /EPD 1.02 1.54 1.23 0.83 0.29 0.27 0.25 0.11
|f2/f TP | 0.52 0.22 0.08 0.26 0.08 0.49 0.15 0.14
f/(CT TP +T TP ) 1.78 1.64 1.22 1.20 2.03 3.16 4.96 3.31
CT TP /CT2 0.39 0.26 1.13 3.57 2.67 1.80 1.00 3.57
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims (8)

1. The optical image lens assembly sequentially comprises a covering lens and a lens group from an object side to an image side along an optical axis,
the covering lens has positive focal power or negative focal power, and the object side surface of the covering lens is a plane;
the lens group sequentially comprises the following components from an object side to an image side:
a first lens having positive optical power; and
a second lens having negative optical power;
the number of lenses with focal power in the optical image lens group is three;
the effective focal length f of the optical image lens assembly and the effective focal length f1 of the first lens satisfy the following conditions: 0.5< f/f1<1.5;
The effective focal length f of the optical image lens assembly and the effective focal length f2 of the second lens meet the following conditions: -1<f/f2<0;
air space T between the cover lens and the first lens on the optical axis TP The following conditions are satisfied between the optical imaging lens group and the entrance pupil diameter EPD: 0<T TP /EPD<1.6。
2. The optical imaging lens set of claim 1, wherein an effective focal length f of the optical imaging lens set is equal to the focal length fEffective focal length f of the cover lens TP The following are satisfied: i f/f TP |<0.5。
3. The optical imaging lens assembly of claim 1, wherein an effective focal length f2 of the second lens and an effective focal length f of the cover lens TP The following are satisfied: 0<|f2/f TP |<1。
4. An optical imaging lens assembly according to any one of claims 1-3, wherein the effective focal length f of the optical imaging lens assembly is equal to the radius of curvature R of the image side of the cover lens TP2 The following are satisfied: i f/R TP2 |<1。
5. An optical imaging lens assembly according to any one of claims 1-3, wherein the object side surface of the cover lens has an effective half-aperture D TP1 The following conditions are satisfied between the optical imaging lens group and the entrance pupil diameter EPD: 0.5<D TP1 /EPD<2.5。
6. The optical imaging lens assembly according to any one of claims 1-3, wherein a radius of curvature R4 of an image side of the second lens and a radius of curvature R1 of an object side of the first lens satisfy: (R4-R1)/(R4+R1) | <2.5.
7. The optical imaging lens assembly according to any one of claims 1 to 3, wherein the following conditional expression is satisfied: 1<f/(CT TP +T TP )<5，
F is the effective focal length of the optical image lens group;
CT TP a center thickness for the cover lens; and
T TP an air space between the cover lens and the first lens on the optical axis.
8. The optical imaging lens assembly of any of claims 1-3, wherein the cover lensCenter thickness CT of (2) TP And the center thickness CT2 of the second lens meets the following conditions: 0<CT TP /CT2<4。
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