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CN109270661B - Image pickup lens group - Google Patents

Image pickup lens group Download PDF

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Publication number
CN109270661B
CN109270661B CN201811391995.3A CN201811391995A CN109270661B CN 109270661 B CN109270661 B CN 109270661B CN 201811391995 A CN201811391995 A CN 201811391995A CN 109270661 B CN109270661 B CN 109270661B
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lens
imaging
lens group
curvature
image
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CN109270661A (en
Inventor
徐武超
贾远林
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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
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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

Abstract

The application discloses an imaging lens group, which sequentially comprises the following components from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens having optical power. Wherein the first lens has negative optical power; the second lens has positive optical power; and at least one lens of the first lens to the fifth lens has an aspherical surface that is non-rotationally symmetrical. The effective focal length fx of the imaging lens group in the X-axis direction and the effective focal length fy of the imaging lens group in the Y-axis direction meet 0.5 < fx/fy < 1.5.

Description

Image pickup lens group
Technical Field
The present application relates to an imaging lens group, and more particularly, to an imaging lens group including five lenses.
Background
In recent years, with the rapid development of the field of mobile phone imaging and the popularization of chips of large-size and high-pixel Complementary Metal Oxide Semiconductor (CMOS) devices or photosensitive coupling devices (CCDs), manufacturers of large mobile phones have demanded to make the lens thinner and smaller, and at the same time, have made stringent demands on the imaging quality of the lens. Currently, lenses used in portable electronic products such as mobile phones often adopt rotationally symmetrical (axisymmetrical) aspheric surface type structures. Such rotationally symmetrical aspherical surfaces can be seen as a curve in the meridian plane, which is formed by 360 ° rotation around the optical axis, which has sufficient degrees of freedom only in the meridian plane and thus does not correct off-axis aberrations well.
Disclosure of Invention
The present application provides an imaging lens assembly applicable to a portable electronic product, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens having optical power. Wherein the first lens may have a negative optical power; the second lens may have positive optical power; and at least one of the first to fifth lenses may have an aspherical surface that is non-rotationally symmetrical. The effective focal length fx of the imaging lens group in the X-axis direction and the effective focal length fy of the imaging lens group in the Y-axis direction can meet 0.5 < fx/fy <1.5.
In one embodiment, the radius of curvature R2 of the image side of the first lens and the radius of curvature R1 of the object side of the first lens may satisfy-0.5 < R2/R1 < 0.5.
In one embodiment, the radius of curvature R5 of the object-side surface of the third lens and the radius of curvature R3 of the object-side surface of the second lens may satisfy-0.5 < R5/R3 < 1.0.
In one embodiment, the radius of curvature R6 of the image side of the third lens and the radius of curvature R8 of the image side of the fourth lens may satisfy-3.0 < R6/R8 < -0.5.
In one embodiment, the sum Σat of the distances between any two adjacent lenses in the first to fifth lenses on the optical axis and the distance T12 between the first and second lenses on the optical axis may satisfy 1.0 < Σat/T12 < 3.0.
In one embodiment, the sum Σct of the center thicknesses of the first lens to the fifth lens on the optical axis, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis may satisfy 1.0 < Σct/(CT 1+ct 2) < 3.0, respectively.
In one embodiment, the maximum field angle FOV of the imaging lens group may satisfy FOV > 100 °.
In another aspect, the present application provides an imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens having optical power. Wherein the first lens may have a negative optical power; the second lens may have positive optical power; and at least one of the first to fifth lenses may have an aspherical surface that is non-rotationally symmetrical. The sum Σct of the center thicknesses of the first lens to the fifth lens on the optical axis, the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis can satisfy that Σct/(CT 1+ CT 2) < 3.0.
In still another aspect, the present application provides an imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens having optical power. Wherein the first lens may have a negative optical power; the second lens may have positive optical power; and at least one of the first to fifth lenses may have an aspherical surface that is non-rotationally symmetrical. The curvature radius R5 of the object side surface of the third lens and the curvature radius R3 of the object side surface of the second lens can satisfy R5/R3 less than 1.0.
In still another aspect, the present application provides an imaging lens group including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens having optical power. Wherein the first lens may have a negative optical power; the second lens may have positive optical power; and at least one of the first to fifth lenses may have an aspherical surface that is non-rotationally symmetrical. The curvature radius R6 of the image side of the third lens and the curvature radius R8 of the image side of the fourth lens can satisfy R6/R8 < -0.5.
The application adopts a plurality of (e.g. five) lenses, and the imaging lens group has at least one beneficial effect of miniaturization, wide angle, high pixels and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens and the like. In addition, by introducing the non-rotationally symmetrical aspheric surface, the off-axis meridian aberration and the sagittal aberration of the imaging lens group are corrected simultaneously, so that the imaging image quality is further improved.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
Fig. 1 shows a schematic configuration diagram of an imaging lens group according to embodiment 1 of the present application;
Fig. 2 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 1 is within the first quadrant;
fig. 3 is a schematic diagram showing the structure of an imaging lens group according to embodiment 2 of the present application;
Fig. 4 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 2 is within the first quadrant;
fig. 5 shows a schematic configuration diagram of an imaging lens group according to embodiment 3 of the present application;
fig. 6 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 3 is within the first quadrant;
fig. 7 shows a schematic configuration diagram of an imaging lens group according to embodiment 4 of the present application;
Fig. 8 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 4 is within the first quadrant;
Fig. 9 shows a schematic configuration diagram of an imaging lens group according to embodiment 5 of the present application;
fig. 10 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 5 is within the first quadrant;
Fig. 11 is a schematic diagram showing the structure of an imaging lens group according to embodiment 6 of the present application;
fig. 12 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 6 is within the first quadrant;
Fig. 13 is a schematic diagram showing the structure of an imaging lens group according to embodiment 7 of the present application;
Fig. 14 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 7 is within the first quadrant;
fig. 15 shows a schematic configuration diagram of an imaging lens group according to embodiment 8 of the present application;
fig. 16 schematically shows a case where the RMS spot diameter of the imaging lens group of embodiment 8 is within the first quadrant.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. In each lens, the surface closest to the subject is referred to as the subject side of the lens; in each lens, the surface closest to the imaging plane is referred to as the image side of the lens.
Herein, we define a direction parallel to the optical axis as a Z-axis direction, a direction perpendicular to the Z-axis and lying in a meridian plane as a Y-axis direction, and a direction perpendicular to the Z-axis and lying in a sagittal plane as an X-axis direction. Unless otherwise specified, each parameter symbol (e.g., radius of curvature, etc.) other than the parameter symbol related to the field of view herein represents a characteristic parameter value in the Y-axis direction of the imaging lens group. For example, unless otherwise specified, the conditional expression "R2/R1" indicates a ratio of the radius of curvature R2Y in the Y-axis direction of the image side surface of the first lens to the radius of curvature R1Y in the Y-axis direction of the object side surface of the first lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The image pickup lens group according to the exemplary embodiment of the present application may include, for example, five lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are sequentially arranged from the object side to the image side along the optical axis, and each adjacent lens can have an air space therebetween.
In an exemplary embodiment, the first lens may have negative optical power; the second lens may have positive optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power or negative focal power; and the fifth lens has positive optical power or negative optical power. The focal power of the lens system is reasonably configured, when the focal power of the first lens is negative, the inclination angle of incident light rays is reduced, so that effective sharing of a large field of view of an object is realized, and a larger field angle range is obtained; when the focal power of the second lens is positive, the second lens is combined with the first lens with negative focal power, so that off-axis aberration of the optical system can be corrected, and imaging quality can be improved.
In an exemplary embodiment, the image quality may be further improved by setting the object side surface and/or the image side surface of at least one of the first to fifth lenses to be an aspherical surface that is non-rotationally symmetrical. The non-rotationally symmetrical aspheric surface is a free-form surface, and the non-rotationally symmetrical component is added on the basis of the rotationally symmetrical aspheric surface, so that the introduction of the non-rotationally symmetrical aspheric surface in the lens system is beneficial to effectively correcting off-axis meridian aberration and sagittal aberration, and greatly improving the performance of the optical system. The imaging lens group according to the present application may include at least one non-rotationally symmetrical aspherical surface, for example, one non-rotationally symmetrical aspherical surface, two non-rotationally symmetrical aspherical surfaces, three non-rotationally symmetrical aspherical surfaces, or a plurality of non-rotationally symmetrical aspherical surfaces.
In the following examples, the object side surface of the first lens element in example 1, the image side surface of the second lens element in example 2, the image side surface of the first lens element and the object side surface of the second lens element in example 3, the object side surface of the third lens element and the object side surface of the fourth lens element in example 4, the object side surface of the third lens element and the object side surface of the fifth lens element and the image side surface of the fourth lens element in example 5, the object side surface of the first lens element and the object side surface of the fifth lens element in example 6, and the image side surface of the fifth lens element in example 7 are rotationally asymmetric aspherical surfaces, that is, free-form surfaces.
In an exemplary embodiment, the image side of the first lens may be concave.
In an exemplary embodiment, the object side surface of the third lens may be convex.
In some embodiments, the third lens may have positive optical power, and its image side may be convex; the fourth lens element may have negative refractive power, wherein the object-side surface thereof may be concave, and the image-side surface thereof may be concave; the fifth lens element may have positive refractive power, wherein an object-side surface thereof may be convex, and an image-side surface thereof may be convex. The focal power of each lens in the system is reasonably configured, so that good imaging effect can be realized.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.5 < fx/fy < 1.5, where fx is an effective focal length in an X-axis direction of the imaging lens group and fy is an effective focal length in a Y-axis direction of the imaging lens group. More specifically, fx and fy may further satisfy 0.79. Ltoreq.fx/fy. Ltoreq.1.41. The focal length ratio in the X-axis and Y-axis directions is reasonably configured, so that the degree of freedom of the free curved surface in two directions is improved, and the correcting effect of the photographing lens group on off-axis aberration is optimized; meanwhile, the aberration and various parameters of the imaging lens group are controlled in a proper range, so that the imaging quality of the lens group is improved.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression-0.5 < R2/R1 < 0.5, where R2 is a radius of curvature of an image side surface of the first lens element and R1 is a radius of curvature of an object side surface of the first lens element. More specifically, R2 and R1 may further satisfy-0.12.ltoreq.R2/R1.ltoreq.0.19. The curvature radius of the first lens is reasonably configured, so that the first lens can effectively share a large field of view of an object space, and the correcting capability of a subsequent optical group on off-axis aberration is improved.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression-0.5 < R5/R3 < 1.0, where R5 is a radius of curvature of an object side surface of the third lens element, and R3 is a radius of curvature of an object side surface of the second lens element. More specifically, R5 and R3 may further satisfy-0.23.ltoreq.R5/R3.ltoreq.0.63. The curvature radius of the lens is reasonably configured, so that CRA matching of the lens is guaranteed, field curvature of the lens is corrected, and imaging definition requirements of each field of view are met.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition of-3 < R6/R8 < -0.5, wherein R6 is a radius of curvature of an image side surface of the third lens element and R8 is a radius of curvature of an image side surface of the fourth lens element. More specifically, R6 and R8 may further satisfy-2.97.ltoreq.R6/R8.ltoreq.0.68. The curvature radius of the lens is reasonably configured, so that the spherical aberration of the optical system can be effectively eliminated, and a high-definition image can be obtained. Optionally, the image side surface of the third lens and the image side surface of the fourth lens are both convex, or the image side surface of the third lens and the image side surface of the fourth lens are both concave.
In an exemplary embodiment, the imaging lens assembly of the present application may satisfy the condition 1 < Σct/(CT 1+ct 2) < 3.0, wherein Σct is a sum of center thicknesses of the first lens element to the fifth lens element on the optical axis, CT1 is a center thickness of the first lens element on the optical axis, and CT2 is a center thickness of the second lens element on the optical axis. More specifically, sigma CT, CT1 and CT2 may further satisfy Sigma CT/(CT1+CT2). Ltoreq.2.86 of 1.48. The thickness sensitivity of the lens can be effectively reduced by reasonably configuring the center thickness of each lens, and the miniaturization requirement of the lens group is met.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the condition that Σat/T12 < 3.0 is satisfied, where Σat is a sum of distances between any adjacent two lenses of the first lens to the fifth lens on the optical axis, and T12 is a distance between the first lens and the second lens on the optical axis. More specifically, sigmaAT and T12 may further satisfy 1.0 < SigmaAT/T12.ltoreq.2.0, for example, 1.39.ltoreq.SigmaAT/T12.ltoreq.1.90. The air gaps among the lenses in the lens group are reasonably configured, so that the gap sensitivity of the lens can be effectively reduced, and the curvature of field of the lens can be corrected.
In an exemplary embodiment, the imaging lens group of the present application may satisfy a conditional FOV > 100 °, where FOV is a maximum field angle of the imaging lens group. More specifically, the FOV may further satisfy 105.2.ltoreq.FOV.ltoreq.128.3. The conditional FOV is more than 100 degrees, which is favorable for obtaining a larger field of view range and improving the collection capability of the optical system on object information.
In an exemplary embodiment, the image capturing lens assembly may further include a diaphragm to improve the imaging quality of the lens. The diaphragm may be disposed between the object side and the third lens. For example, a stop may be provided between the first lens and the second lens, or a stop may be provided between the second lens and the third lens.
Optionally, the above-mentioned imaging lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
The imaging lens group according to the above embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the camera lens group is more beneficial to production and processing and is applicable to portable electronic products. In addition, by introducing the non-rotationally symmetrical aspheric surface, the off-axis meridian aberration and the sagittal aberration of the imaging lens group are corrected, so that the imaging image quality can be further improved.
In the embodiment of the present application, aspherical mirror surfaces are often used as the mirror surfaces of the respective lenses. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be aspherical. Alternatively, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may be aspherical surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens group can be varied to achieve the various results and advantages described in the present specification without departing from the technical solution claimed in the present application. For example, although the description has been made by taking five lenses as an example in the embodiment, the imaging lens group is not limited to include five lenses. The imaging lens group may further include other numbers of lenses, if necessary.
Specific examples of the imaging lens group applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An imaging lens group according to embodiment 1 of the present application is described below with reference to fig. 1 and 2. Fig. 1 shows a schematic configuration diagram of an imaging lens group according to embodiment 1 of the present application.
As shown in fig. 1, an imaging lens group according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 1 shows the surface type, the radius of curvature X, the radius of curvature Y, the thickness, the material, the conic coefficient X, and the conic coefficient Y of each lens of the imaging lens group of example 1, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 1
As can be seen from table 1, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3, the fourth lens element E4 and the fifth lens element E5 and the image side surface S2 of the first lens element E1 are aspheric. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
Wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. The following Table 2 shows the higher order coefficients A 4、A6、A8、A10、A12、A14 and A 16 that can be used for each of the aspherical mirrors S2-S10 in example 1.
Face number A4 A6 A8 A10 A12 A14 A16
S2 1.1270E-02 9.9857E-03 -9.6670E-03 5.3802E-03 -1.7677E-03 3.0433E-04 -2.0839E-05
S3 -9.0599E-03 9.3724E-04 -2.3730E-03 1.8619E-03 -6.7974E-04 1.2296E-04 -9.0336E-06
S4 -2.1517E-03 3.5930E-03 1.4910E-03 -2.0515E-03 -3.2248E-04 1.4049E-03 -5.0992E-04
S5 -1.1996E-02 7.2489E-03 -7.3318E-03 5.0848E-03 -2.5001E-03 6.3513E-04 -6.1950E-05
S6 -5.3935E-02 3.8387E-02 -3.2655E-02 2.0391E-02 -8.3951E-03 1.9536E-03 -1.8717E-04
S7 -6.2946E-02 4.5755E-02 -4.8061E-02 3.8735E-02 -2.0045E-02 5.7179E-03 -6.6505E-04
S8 -3.4254E-02 4.1729E-02 -3.6700E-02 2.3602E-02 -9.3270E-03 1.9951E-03 -1.7528E-04
S9 -3.4828E-02 2.1839E-02 -1.4348E-02 7.0491E-03 -1.9585E-03 2.7415E-04 -1.5264E-05
S10 -9.4352E-03 -2.2137E-03 7.8485E-03 -5.4912E-03 1.9766E-03 -3.4251E-04 2.2437E-05
TABLE 2
As can be further seen from table 1, the object-side surface S1 of the first lens element E1 is an aspheric surface (i.e., AAS surface) with non-rotational symmetry, and the surface shape of the aspheric surface with non-rotational symmetry can be defined by, but not limited to, the following aspheric surface formula:
wherein Z is the sagittal height of the plane parallel to the Z-axis direction; CUX and CUY are the curvatures (=1/radius of curvature) of the vertices of the X, Y axial planes, respectively; KX and KY are cone coefficients in the X, Y axial direction respectively; AR, BR, CR, DR are 4 th order, 6 th order, 8 th order, 10 th order coefficients in the aspheric rotationally symmetric component, respectively; AP, BP, CP, DP are the 4 th, 6 th, 8 th and 10 th order coefficients, respectively, in the aspherical non-rotationally symmetric component. Table 3 below gives the AR, BR, CR, DR coefficients and AP, BP, CP, DP coefficients of the non-rotationally symmetrical aspherical surface S1 that can be used in example 1.
AAS surface AR BR CR DR AP BP CP DP
S1 1.1413E-03 -1.6184E-04 5.4732E-06 -7.1764E-08 -1.7514E-01 -2.0280E-02 9.8522E-04 1.4512E-02
TABLE 3 Table 3
Table 4 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 1, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle Semi-FOV.
f1(mm) -3.46 fx(mm) 1.89
f2(mm) 9.11 fy(mm) 1.97
f3(mm) 3.27 TTL(mm) 12.17
f4(mm) -2.66 ImgH(mm) 2.48
f5(mm) 3.30 Semi-FOV(°) 54.9
TABLE 4 Table 4
The imaging lens group in embodiment 1 satisfies:
fx/fy=0.96, where fx is an effective focal length in the X-axis direction of the imaging lens group, and fy is an effective focal length in the Y-axis direction of the imaging lens group;
R2/r1=0.14, wherein R2 is a radius of curvature of the image side surface S2 of the first lens element E1, and R1 is a radius of curvature of the object side surface S1 of the first lens element E1;
r5/r3= -0.05, wherein R5 is the radius of curvature of the object-side surface S5 of the third lens element E3, and R3 is the radius of curvature of the object-side surface S3 of the second lens element E2;
R6/r8= -1.09, where R6 is the radius of curvature of the image-side surface S6 of the third lens element E3, and R8 is the radius of curvature of the image-side surface S8 of the fourth lens element E4;
Σct/(CT 1+ CT 2) =1.50, wherein Σct is the sum of the center thicknesses of the first lens element E1 to the fifth lens element E5 on the optical axis, respectively, CT1 is the center thickness of the first lens element E1 on the optical axis, and CT2 is the center thickness of the second lens element E2 on the optical axis;
Σat/t12=1.39, where Σat is the sum of the distances between any two adjacent lenses in the first lens E1 to the fifth lens E5 on the optical axis, and T12 is the distance between the first lens E1 and the second lens E2 on the optical axis;
fov=109.7°, where FOV is the maximum field angle of the imaging lens group.
Fig. 2 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 1 at different image height positions in the first quadrant. As can be seen from fig. 2, the imaging lens group provided in embodiment 1 can achieve good imaging quality.
Example 2
An imaging lens group according to embodiment 2 of the present application is described below with reference to fig. 3 and 4. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an imaging lens group according to embodiment 2 of the present application.
As shown in fig. 3, the imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 5 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 2, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 5
As can be seen from table 5, in example 2, the object side surface and the image side surface of any one of the first lens element E1, the third lens element E3, the fourth lens element E4 and the fifth lens element E5 and the object side surface S3 of the second lens element E2 are aspheric; the image side surface S4 of the second lens E2 is an aspherical surface with non-rotational symmetry.
Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 7 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S4 in embodiment 2, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16
S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 4.8737E-03 -2.1471E-02 3.3751E-02 -3.1517E-02 1.7048E-02 -4.8816E-03 5.7524E-04
S5 -7.7443E-03 1.0301E-03 -8.6122E-04 -2.1649E-04 1.4008E-04 9.6795E-07 -8.8410E-06
S6 -3.7536E-02 1.0323E-02 5.5321E-03 -7.9819E-03 3.7473E-03 -7.8320E-04 5.9461E-05
S7 -5.4909E-02 -1.9216E-03 3.1525E-02 -3.2321E-02 1.6313E-02 -4.0442E-03 3.9225E-04
S8 -3.2735E-02 1.7744E-02 -5.3505E-03 9.8395E-04 -8.6437E-05 2.6304E-06 1.5563E-07
S9 -1.8454E-02 1.0853E-02 -3.3379E-03 4.1658E-04 1.2297E-04 -5.4381E-05 5.8847E-06
S10 -5.4846E-04 -8.9536E-03 7.0060E-03 -2.5711E-03 5.3143E-04 -5.7071E-05 2.4699E-06
TABLE 6
AAS surface AR BR CR DR AP BP CP DP
S4 -2.7035E-03 5.9975E-03 -3.0706E-03 1.0179E-03 4.1115E-01 4.5022E-02 -2.6323E-02 -2.5802E-02
TABLE 7
Table 8 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 2, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle Semi-FOV.
f1(mm) -3.38 fx(mm) 2.17
f2(mm) 10.18 fy(mm) 2.16
f3(mm) 2.75 TTL(mm) 12.62
f4(mm) -2.30 ImgH(mm) 3.25
f5(mm) 3.04 Semi-FOV(°) 64
TABLE 8
Fig. 4 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 2 at different image height positions in the first quadrant. As can be seen from fig. 4, the imaging lens group provided in embodiment 2 can achieve good imaging quality.
Example 3
An imaging lens group according to embodiment 3 of the present application is described below with reference to fig. 5 and 6. Fig. 5 shows a schematic configuration diagram of an imaging lens group according to embodiment 3 of the present application.
As shown in fig. 5, the imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 9 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 3, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 9
As can be seen from table 9, in example 3, the object side surface and the image side surface of any one of the third lens element E3, the fourth lens element E4 and the fifth lens element E5, the object side surface S1 of the first lens element E1 and the image side surface S4 of the second lens element E2 are aspheric; the image side surface S2 of the first lens element E1 and the object side surface S3 of the second lens element E2 are aspheric with respect to rotation.
Table 10 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 11 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S2 and S3 in embodiment 3, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16
S1 3.2918E-03 -7.9060E-04 7.3851E-05 -3.9177E-06 1.2183E-07 -2.0499E-09 1.4079E-11
S4 -1.8923E-03 -5.0305E-03 2.7506E-02 -4.4347E-02 3.8420E-02 -1.6406E-02 2.8286E-03
S5 -6.7730E-03 2.4238E-03 -1.0424E-03 -2.3835E-03 2.4944E-03 -1.0502E-03 1.7280E-04
S6 -5.5875E-02 4.1874E-02 -2.3381E-02 1.4252E-03 5.1286E-03 -2.5065E-03 3.9447E-04
S7 -6.6643E-02 6.8907E-02 -7.2473E-02 4.8915E-02 -2.0208E-02 4.6472E-03 -4.3861E-04
S8 -3.5276E-02 5.6474E-02 -6.1054E-02 4.0179E-02 -1.4748E-02 2.7799E-03 -2.0812E-04
S9 -2.0498E-02 1.7713E-02 -1.9738E-02 1.1798E-02 -3.3446E-03 3.9721E-04 -1.1611E-05
S10 -2.2237E-03 -2.2180E-03 5.3019E-03 -3.7920E-03 1.3825E-03 -2.4187E-04 1.5830E-05
Table 10
AAS surface AR BR CR DR AP BP CP DP
S2 1.5603E-02 1.4885E-03 -1.0774E-03 1.8003E-04 1.2560E-02 5.4186E-02 1.3934E-02 1.6507E-02
S3 -5.5944E-03 4.3898E-03 -2.5917E-03 1.6792E-03 3.4120E-02 4.6583E-02 3.7174E-02 1.2205E-02
TABLE 11
Table 12 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 3, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle Semi-FOV.
f1(mm) -3.458 fx(mm) 2.37
f2(mm) 15.98 fy(mm) 2.25
f3(mm) 348 TTL(mm) 12.90
f4(mm) -2.86 ImgH(mm) 2.48
f5(mm) 3.95 Semi-FOV(°) 52.6
Table 12
Fig. 6 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 3 at different image height positions in the first quadrant. As can be seen from fig. 6, the imaging lens group provided in embodiment 3 can achieve good imaging quality.
Example 4
An imaging lens group according to embodiment 4 of the present application is described below with reference to fig. 7 and 8. Fig. 7 shows a schematic configuration diagram of an imaging lens group according to embodiment 4 of the present application.
As shown in fig. 7, the imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 13 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 4, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 13
As can be seen from table 13, in example 4, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2 and the fifth lens element E5, the image side surface S6 of the third lens element E3 and the image side surface S8 of the fourth lens element E4 are aspheric; the object side surface S5 of the third lens element E3 and the object side surface S7 of the fourth lens element E4 are aspheric with respect to non-rotational symmetry.
Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 15 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S5 and S7 in embodiment 4, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
TABLE 14
AAS surface AR BR CR DR AP BP CP DP
S5 -1.8333E-02 1.2684E-02 4.3391E-05 -2.9830E-03 1.2844E-01 1.4613E-01 -1.3320E+00 2.3058E-01
S7 -4.6894E-02 1.0399E-02 -2.4790E-02 -5.7629E-04 -2.6782E-01 1.6353E-01 -8.2963E-03 -4.3368E-01
TABLE 15
Table 16 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 4, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle Semi-FOV.
f1(mm) -2.96 fx(mm) 1.73
f2(mm) 5.91 fy(mm) 1.50
f3(mm) -15.466 TTL(mm) 11.92
f4(mm) 2.49 ImgH(mm) 2.48
f5(mm) -10.9 Semi-FOV(°) 64.2
Table 16
Fig. 8 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 4 at different image height positions in the first quadrant. As can be seen from fig. 8, the imaging lens group provided in embodiment 4 can achieve good imaging quality.
Example 5
An imaging lens group according to embodiment 5 of the present application is described below with reference to fig. 9 and 10. Fig. 9 shows a schematic configuration diagram of an imaging lens group according to embodiment 5 of the present application.
As shown in fig. 9, an imaging lens group according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 17 shows the surface type, the radius of curvature X, the radius of curvature Y, the thickness, the material, the conic coefficient X, and the conic coefficient Y of each lens of the imaging lens group of example 5, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
TABLE 17
As can be seen from table 17, in example 5, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, and the fourth lens element E4, and the object side surface S5 of the third lens element E3 are aspherical surfaces; the image side surface S6 of the third lens element E3 and the object side surface S9 and the image side surface S10 of the fifth lens element E5 are aspheric with no rotational symmetry.
Table 18 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 19 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the non-rotationally symmetric aspherical surfaces S5, S9, and S10 in embodiment 5, wherein the non-rotationally symmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16
S1 7.4093E-03 -2.3328E-03 3.7344E-04 -3.5458E-05 1.9842E-06 -6.0165E-08 7.6410E-10
S2 9.7379E-03 1.8107E-02 -1.3376E-02 4.8893E-03 -9.7945E-04 1.0053E-04 -4.1275E-06
S3 -6.4785E-03 -6.2001E-03 5.2699E-03 -3.0060E-03 9.7890E-04 -1.6089E-04 1.0591E-05
S4 1.5906E-03 -2.4925E-03 -8.8286E-04 8.2477E-03 -8.6316E-03 3.6848E-03 -5.7488E-04
S5 -7.5416E-03 2.7397E-03 -4.9283E-03 3.5144E-03 -1.5773E-03 3.7424E-04 -3.7645E-05
S7 -3.8355E-02 -1.6543E-02 2.5339E-02 -1.4480E-02 4.7788E-03 -8.7663E-04 7.1392E-05
S8 -2.4303E-02 7.7209E-03 8.1789E-03 -7.2332E-03 2.6238E-03 -4.7375E-04 3.5675E-05
TABLE 18
AAS surface AR BR CR DR AP BP CP DP
S6 -3.7226E-02 7.5806E-03 -6.6087E-04 1.5903E-05 1.5985E-02 2.9990E-02 -4.8459E-03 -2.8978E-01
S9 -3.2762E-02 1.2647E-02 -2.5962E-03 2.0438E-04 -9.8199E-02 1.6109E-03 -1.0424E-02 -3.3946E-03
S10 -8.1162E-03 1.5521E-03 1.5608E-04 -2.6194E-05 -2.1536E-01 1.7682E-01 1.0610E-02 -1.2252E-02
TABLE 19
Table 20 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 5, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle Semi-FOV.
f1(mm) -3.29 fx(mm) 1.61
f2(mm) 8.66 fy(mm) 2.03
f3(mm) 3.377 TTL(mm) 14.17
f4(mm) -3.3 ImgH(mm) 3.25
f5(mm) 4.994 Semi-FOV(°) 55.7
Table 20
Fig. 10 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 5 at different image height positions in the first quadrant. As can be seen from fig. 10, the imaging lens group provided in embodiment 5 can achieve good imaging quality.
Example 6
An imaging lens group according to embodiment 6 of the present application is described below with reference to fig. 11 and 12.
Fig. 11 shows a schematic configuration diagram of an imaging lens group according to embodiment 6 of the present application.
As shown in fig. 11, an imaging lens group according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 21 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 6, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 21
As can be seen from table 21, in example 6, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3 and the fifth lens element E5 and the object side surface S7 of the fourth lens element E4 are aspheric; the image side surface S8 of the fourth lens element E4 is an aspheric surface with non-rotational symmetry.
Table 22 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 23 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S8 in embodiment 6, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16
S1 3.5705E-03 -1.1765E-03 2.1022E-04 -1.9922E-05 7.8978E-07 4.3753E-09 -9.7235E-10
S2 3.0064E-02 -1.1145E-02 5.6140E-03 -2.1757E-03 5.4658E-04 -7.7130E-05 4.3230E-06
S3 -8.5697E-03 -2.1379E-02 2.4775E-02 -1.4893E-02 5.2288E-03 -9.7654E-04 7.0741E-05
S4 8.7156E-03 -3.7807E-02 6.5939E-02 -6.0821E-02 3.2349E-02 -9.1714E-03 1.0617E-03
S5 -1.3475E-02 4.6701E-03 1.0543E-03 -6.5568E-03 5.3846E-03 -2.0755E-03 3.1427E-04
S6 -5.5356E-02 4.2755E-02 -6.7815E-02 6.6878E-02 -3.5807E-02 9.7931E-03 -1.0773E-03
S7 -6.7926E-02 4.3896E-02 -4.7849E-02 3.3337E-02 -1.0536E-02 1.0047E-03 7.5476E-05
S9 -4.4744E-02 -9.4875E-03 3.2787E-02 -2.2891E-02 9.0052E-03 -2.0660E-03 2.0606E-04
S10 -1.8537E-02 2.2229E-02 -2.4584E-02 1.6699E-02 -4.2306E-03 2.0087E-04 3.8197E-05
Table 22
AAS surface AR BR CR DR AP BP CP DP
S8 -2.8829E-02 2.1995E-02 -6.1468E-03 8.0412E-04 -6.8382E-02 -3.9420E-04 2.2424E-02 2.9896E-02
Table 23
Table 24 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 6, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle Semi-FOV.
f1(mm) -4.52 fx(mm) 2.31
f2(mm) 9.49 fy(mm) 2.37
f3(mm) 4.66 TTL(mm) 9.95
f4(mm) -4.28 ImgH(mm) 3.25
f5(mm) 3.22 Semi-FOV(°) 52.6
Table 24
Fig. 12 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 6 at different image height positions in the first quadrant. As can be seen from fig. 12, the imaging lens group provided in embodiment 6 can achieve good imaging quality.
Example 7
An imaging lens group according to embodiment 7 of the present application is described below with reference to fig. 13 and 14. Fig. 13 shows a schematic configuration diagram of an imaging lens group according to embodiment 7 of the present application.
As shown in fig. 13, an imaging lens group according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 25 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 7, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 25
As can be seen from table 25, in example 7, the object side surface and the image side surface of any one of the second lens element E2, the third lens element E3 and the fourth lens element E4, the image side surface S2 of the first lens element E1 and the image side surface S10 of the fifth lens element E5 are aspheric; the object side surface S1 of the first lens element E1 and the object side surface S9 of the fifth lens element E5 are aspheric with respect to non-rotational symmetry.
Table 26 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 27 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surfaces S1 and S9 in embodiment 7, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16
S2 8.0896E-03 -2.4237E-04 -4.8740E-04 2.3400E-04 -5.3419E-05 6.0315E-06 -2.6787E-07
S3 -3.1400E-03 -1.4883E-02 2.4317E-02 -2.2027E-02 1.0885E-02 -2.7356E-03 2.7709E-04
S4 3.2401E-04 -1.1764E-02 5.0167E-02 -9.8734E-02 1.0326E-01 -5.3060E-02 1.0476E-02
S5 -1.4712E-02 2.0465E-02 -1.4754E-02 1.3138E-03 5.4638E-03 -3.5086E-03 6.9360E-04
S6 -6.9055E-02 7.7834E-02 -1.6598E-02 -4.6953E-02 4.8308E-02 -1.8971E-02 2.7953E-03
S7 -7.4795E-02 1.3989E-01 -1.2753E-01 6.3268E-02 -2.4621E-02 7.7616E-03 -1.1904E-03
S8 -5.1731E-02 9.3119E-02 -6.5911E-02 2.9944E-02 -1.0169E-02 2.2984E-03 -2.4119E-04
S10 -3.3846E-02 8.0104E-03 3.4127E-02 -4.5466E-02 2.4257E-02 -6.1985E-03 6.3034E-04
Table 26
AAS surface AR BR CR DR AP BP CP DP
S1 1.1663E-03 -9.9901E-05 2.5001E-06 -2.1903E-08 3.5576E-01 4.2723E-02 -1.2625E-02 -2.0415E-02
S9 -3.2914E-02 4.9841E-03 2.0476E-04 -5.4721E-05 -3.8395E-02 -8.1210E-02 8.5528E-02 -1.5631E-01
Table 27
Table 28 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 7, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle Semi-FOV.
f1(mm) -4.8 fx(mm) 2.43
f2(mm) 12.56 fy(mm) 1.72
f3(mm) 2.53 TTL(mm) 15.30
f4(mm) -2.04 ImgH(mm) 3.25
f5(mm) 3.3 Semi-FOV(°) 63.5
Table 28
Fig. 14 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 7 at different image height positions in the first quadrant. As can be seen from fig. 14, the imaging lens group provided in embodiment 7 can achieve good imaging quality.
Example 8
An imaging lens group according to embodiment 8 of the present application is described below with reference to fig. 15 and 16. Fig. 15 shows a schematic configuration diagram of an imaging lens group according to embodiment 8 of the present application.
As shown in fig. 15, the imaging lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a filter E6, and an imaging surface S13.
The first lens element E1 has negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element E2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The filter E7 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
Table 29 shows the surface type, radius of curvature X, radius of curvature Y, thickness, material, conic coefficient X, and conic coefficient Y of each lens of the imaging lens group of example 8, wherein the units of the radius of curvature X, the radius of curvature Y, and the thickness are millimeters (mm).
Table 29
As can be seen from table 29, in example 8, the object side surface and the image side surface of any one of the first lens element E1, the second lens element E2, the third lens element E3 and the fourth lens element E4 and the object side surface S9 of the fifth lens element E5 are aspheric; the image side surface S10 of the fifth lens element E5 is an aspheric surface with non-rotational symmetry.
Table 30 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above. Table 31 shows rotationally symmetric components and higher-order coefficients of the rotationally symmetric components that can be used for the rotationally asymmetric aspherical surface S10 in embodiment 8, wherein the rotationally asymmetric aspherical surface profile can be defined by the formula (2) given in embodiment 1 above.
Face number A4 A6 A8 A10 A12 A14 A16
S1 8.6981E-03 -1.9906E-03 2.7244E-04 -2.2566E-05 1.1181E-06 -3.0522E-08 3.5235E-10
S2 8.9541E-03 3.6844E-03 -3.3374E-03 1.0693E-03 -1.7529E-04 1.4898E-05 -5.3634E-07
S3 -1.6838E-02 2.0481E-02 -2.3077E-02 1.4088E-02 -4.9128E-03 9.1015E-04 -6.9685E-05
S4 -6.5924E-03 8.5748E-03 -1.2124E-02 1.1630E-02 -6.7874E-03 2.2532E-03 -3.2210E-04
S5 8.4541E-04 -1.8056E-02 2.9151E-02 -2.7232E-02 1.4447E-02 -4.1402E-03 4.8531E-04
S6 -6.6262E-02 6.6010E-02 -5.1762E-02 2.9162E-02 -1.0371E-02 1.9614E-03 -1.4316E-04
S7 -3.0302E-02 -6.7900E-02 1.6063E-01 -1.6751E-01 9.2848E-02 -2.6986E-02 3.2574E-03
S8 -2.0596E-02 -2.3108E-02 5.6101E-02 -3.8295E-02 1.1914E-02 -1.5658E-03 4.7422E-05
S9 -1.1883E-02 -5.6527E-02 8.0773E-02 -4.8510E-02 1.5506E-02 -2.5890E-03 1.7856E-04
Table 30
AAS surface AR BR CR DR AP BP CP DP
S10 -1.4871E-02 6.0560E-03 4.9660E-04 -6.2333E-05 1.1391E-01 -2.4201E-02 2.2865E-01 1.6533E-01
Table 31
Table 32 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 8, an effective focal length fx in the X-axis direction of the imaging lens group, an effective focal length fy in the Y-axis direction of the imaging lens group, an optical total length TTL of the imaging lens group (i.e., a distance on the optical axis from the object side surface S1 to the imaging surface S13 of the first lens E1), a half of the diagonal length ImgH of an effective pixel region on the imaging surface S13, and a maximum half field angle semi-FOV.
f1(mm) -3.498 fx(mm) 2.31
f2(mm) 11.228 fy(mm) 2.19
f3(mm) 2.91 TTL(mm) 12.49
f4(mm) -2.45 ImgH(mm) 3.25
f5(mm) 3.293 semi-FOV(°) 58.3
Table 32
Fig. 16 shows the magnitude of RMS spot diameters of the imaging lens group of embodiment 8 at different image height positions in the first quadrant. As can be seen from fig. 16, the imaging lens group provided in embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 33.
Conditional\embodiment 1 2 3 4 5 6 7 8
fx/fy 0.96 1.00 1.05 1.15 0.79 0.97 1.41 1.06
R2/R1 0.14 0.19 0.12 0.11 0.14 0.18 0.06 -0.12
R5/R3 -0.05 -0.18 0.63 0.15 -0.17 -0.02 -0.23 0.52
R6/R8 -1.09 -0.68 -1.07 -0.89 -1.24 -2.97 -1.03 -1.00
∑CT/(CT1+CT2) 1.50 2.46 2.86 1.58 2.35 2.27 1.48 1.86
∑AT/T12 1.39 1.56 1.51 1.57 1.84 1.90 1.48 1.56
FOV(°) 109.7 127.9 105.2 128.3 111.4 105.3 127.0 116.5
Table 33
The application also provides an image pickup device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand-alone imaging apparatus such as a digital camera, or may be an imaging module integrated on a mobile electronic apparatus such as a cellular phone. The image pickup apparatus is equipped with the above-described image pickup lens group.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (6)

1. The image capturing lens assembly includes, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens having optical power, characterized in that,
The first lens has negative focal power, and the image side surface of the first lens is a concave surface;
the second lens has positive optical power;
the object side surface of the third lens is a convex surface;
The focal power of the third lens, the fourth lens and the fifth lens is positive or negative or positive or negative respectively;
at least one of the first to fifth lenses has an aspherical surface that is non-rotationally symmetrical;
the effective focal length fx of the imaging lens group in the X-axis direction and the effective focal length fy of the imaging lens group in the Y-axis direction meet 0.5 < fx/fy < 1.5 and fx is not equal to fy; and
The sum of center thicknesses sigma CT of the first lens and the fifth lens on the optical axis, the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis respectively meet 1.0 < sigmaCT/(CT 1+ CT 2) < 3.0;
the number of lenses having optical power in the imaging lens group is five.
2. The imaging lens system according to claim 1, wherein a radius of curvature R2 of an image side surface of the first lens and a radius of curvature R1 of an object side surface of the first lens satisfy-0.5 < R2/R1 < 0.5.
3. The imaging lens system according to claim 1, wherein a radius of curvature R5 of an object side surface of the third lens and a radius of curvature R3 of an object side surface of the second lens satisfy-0.5 < R5/R3 < 1.0.
4. The imaging lens system according to claim 1, wherein a radius of curvature R6 of an image side surface of the third lens and a radius of curvature R8 of an image side surface of the fourth lens satisfy-3.0 < R6/R8 < -0.5.
5. The imaging lens system according to claim 1, wherein a sum Σat of distances between any adjacent two lenses of the first lens to the fifth lens on the optical axis and a distance T12 between the first lens and the second lens on the optical axis satisfy 1.0 < Σat/T12 < 3.0.
6. The imaging lens group according to any one of claims 1 to 5, wherein a maximum field angle FOV of the imaging lens group satisfies 100 ° < FOV +.128.3 °.
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