CN117148541A - Optical lens - Google Patents

Optical lens Download PDF

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Publication number
CN117148541A
CN117148541A CN202310272231.7A CN202310272231A CN117148541A CN 117148541 A CN117148541 A CN 117148541A CN 202310272231 A CN202310272231 A CN 202310272231A CN 117148541 A CN117148541 A CN 117148541A
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China
Prior art keywords
lens
image
optical lens
optical
concave
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Inventor
王义龙
李旦
李亮
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Jiangxi Lianyi Optics Co Ltd
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Jiangxi Lianyi Optics Co Ltd
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Priority to CN202310272231.7A priority Critical patent/CN117148541A/en
Publication of CN117148541A publication Critical patent/CN117148541A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses

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

Abstract

The application provides an optical lens, which comprises eight lenses in total, wherein the eight lenses sequentially comprise a first lens with positive focal power from an object side to an imaging surface along an optical axis, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens element with positive refractive power having convex object-side and image-side surfaces; a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface; the eighth lens with negative focal power has concave object side and concave image side. The optical lens provided by the application is beneficial to realizing miniaturization; the device has large image height, and improves the adaptation range with chip elements; the aberration optimization effect is obvious, and the imaging quality is good.

Description

Optical lens
Technical Field
The application relates to the technical field of imaging lenses, in particular to an optical lens.
Background
In recent years, with rapid updating of consumer electronic products such as mobile phones and tablet computers, the market demands for imaging lenses at the product end are increasingly diversified. In addition to the imaging lens having a light, thin, short, and small profile and having characteristics of high pixels, high resolution, and the like, imaging quality of the imaging lens at the product end is required.
In view of this, the present application provides an optical lens with characteristics of obvious aberration optimization effect, high image quality, excellent imaging quality, and the like, and is suitable for portable electronic products while achieving miniaturization.
Disclosure of Invention
In view of the above problems, an object of the present application is to provide an optical lens having characteristics of remarkable aberration optimization effect, high image quality, excellent imaging quality, and the like, and being suitable for portable electronic products while achieving miniaturization.
An object of the present application is to provide an optical lens comprising eight lenses in order from an object side to an imaging surface along an optical axis:
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
a fourth lens element with positive refractive power having convex object-side and image-side surfaces;
a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
the eighth lens with negative focal power has concave object side and concave image side.
Further preferably, the optical total length TTL and the effective focal length f of the optical lens satisfy: 1.0 < TTL/f < 1.3.
Further preferably, the real image height IH and the effective focal length f corresponding to the maximum field angle of the optical lens satisfy: IH/f is more than 1.8 and less than 2.0.
Further preferably, the effective focal length f, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: (IH/2)/(f×tan (FOV/2)) of 1.0.ltoreq.1.05.
Further preferably, the firstFocal length f of two lenses 2 The effective focal length f of the lens meets the following conditions: -2 < f2/f < 0.
Further preferably, the focal length f of the seventh lens 7 The effective focal length f of the lens meets the following conditions: 1.6 < f7/f.
Further preferably, the focal length f of the seventh lens 7 Focal length f of the second lens 2 The method meets the following conditions: -0.6 < f 2 /f 7 ＜-1.1。
Further preferably, the effective focal length f of the optical lens and the combined focal length f of the first lens to the third lens 13 The method meets the following conditions: f is 1.1 < f 13 /f＜1.5。
Further preferably, the effective focal length f of the optical lens and the combined focal length f of the sixth lens to the eighth lens 68 The method meets the following conditions: -1.1 < f 68 /f＜-1.4。
Further preferably, a combined focal length f of the first lens to the third lens 13 Combined focal length f with the sixth lens to the eighth lens 68 The method meets the following conditions: -0.9 < f 13 /f 68 ＜-1.2。
Further preferably, the maximum field angle FOV of the optical lens, the object side effective working aperture D of the first lens 1 The real image height IH corresponding to the maximum field angle satisfies: d is 0.25 < 1 /IH/tan(FOV/2)＜0.35。
Further preferably, a sum Σct of an optical total length TTL of the optical lens and center thicknesses of the first lens to the eighth lens along an optical axis, respectively, satisfies: sigma CT/TTL is 0.5 < 0.6.
The optical lens provided by the application can effectively limit the length of the lens, and is beneficial to realizing miniaturization of the optical lens; the device has large image height, and improves the adaptation range with chip elements; by reasonably matching the lens shape and focal power combination among the lenses, the aberration is reduced, and the imaging quality of the optical lens is improved.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an optical lens in embodiment 1 of the present application.
Fig. 2 is a graph showing a field curvature of an optical lens in embodiment 1 of the present application.
FIG. 3 is a graph showing F-tan θ distortion of an optical lens in example 1 of the present application.
Fig. 4 is an MTF graph of the optical lens in example 1 of the present application.
Fig. 5 is an axial aberration diagram of the optical lens in embodiment 1 of the present application.
Fig. 6 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 1 of the present application.
Fig. 7 is a schematic structural diagram of an optical lens in embodiment 2 of the present application.
Fig. 8 is a graph showing the field curvature of the optical lens in embodiment 2 of the present application.
FIG. 9 is a graph showing F-tan θ distortion of an optical lens in example 2 of the present application.
Fig. 10 is an MTF graph of the optical lens in example 2 of the present application.
Fig. 11 is an axial aberration diagram of an optical lens in embodiment 2 of the present application.
Fig. 12 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 2 of the present application.
Fig. 13 is a schematic structural diagram of an optical lens in embodiment 3 of the present application.
Fig. 14 is a graph showing the field curvature of the optical lens in embodiment 3 of the present application.
FIG. 15 is a graph showing F-tan θ distortion of an optical lens in example 3 of the present application.
Fig. 16 is an MTF graph of an optical lens in example 3 of the present application.
Fig. 17 is an axial aberration diagram of an optical lens in embodiment 3 of the present application.
Fig. 18 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present application.
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 these detailed description are merely illustrative of 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 the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the projection plane is referred to as the projection side of the lens, and the surface of each lens closest to the image source plane is referred to as the image source side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
According to the optical lens of the embodiment of the present application, a total of eight lenses, in order from an object side to an imaging surface along an optical axis, include: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a filter.
In some embodiments, the first lens element may have positive optical power, with the object-side surface being convex and the image-side surface being concave; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the third lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the fourth lens element may have positive refractive power, and both object-side and image-side surfaces thereof may be convex; the fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface; the sixth lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the seventh lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the eighth lens element may have negative refractive power, and both the object-side surface and the image-side surface thereof may be concave.
In some embodiments, the optical total length TTL and the effective focal length f of the optical lens satisfy: 1.0 < TTL/f < 1.3. The length of the lens can be effectively limited by meeting the above range, and the miniaturization of the optical lens can be realized.
In some embodiments, the real image height IH and the effective focal length f corresponding to the maximum field angle of the optical lens satisfy: IH/f is more than 1.8 and less than 2.0. The range is satisfied, the characteristic of a large image plane can be realized, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f, the maximum field angle FOV, and the real image height IH of the optical lens corresponding to the maximum field angle satisfy: (IH/2)/(f×tan (FOV/2)) of 1.0.ltoreq.1.05. The above range is satisfied, which means that the optical distortion of the optical lens is well controlled and the resolution of the optical lens is improved.
In some embodiments, the focal length f of the second lens 2 The effective focal length f with the optical lens satisfies: -2 < f 2 And/f < 0. The second lens has proper negative focal power and can increase the imaging area of the optical lens; meanwhile, various aberrations of the optical lens can be effectively balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the focal length f of the seventh lens 7 The effective focal length f with the optical lens satisfies: f is less than 1.6 7 And/f. The range is satisfied, so that the seventh lens has proper positive focal power, the light converging capability of the optical lens can be improved, and the total length of the optical lens can be shortened. Meanwhile, the distortion optimization effect is obvious, and the imaging quality of the optical lens is improved.
In some embodiments, the focal length f of the seventh lens 7 Focal length f of the second lens 2 The method meets the following conditions: -0.6 < f 2 /f 7 And < -1.1. The optical lens can be balanced front and back, astigmatism and field curvature of the lens are reduced, and imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the combined focal lengths f of the first lens to the third lens 13 The method meets the following conditions: f is 1.1 < f 13 And/f is less than 1.5. The range is met, the optimization effect of the first lens, the second lens and the third lens on spherical aberration is obvious, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the combined focal lengths f of the sixth lens to the eighth lens 68 The method meets the following conditions: -1.1 < f 68 /f＜-1.4. The above range is satisfied, so that the optimization effect of the sixth lens, the seventh lens and the eighth lens on astigmatism is obvious, and the imaging quality of the optical lens is improved.
In some embodiments, the combined focal length f of the first lens to the third lens 13 Combined focal length f with sixth to eighth lenses 68 The method meets the following conditions: -0.9 < f 13 /f 68 And < -1.2. The range is satisfied, so that the front and back of the optical lens are balanced, the axial aberration of the lens is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the maximum field angle FOV of the optical lens, the object-side effective working aperture D of the first lens 1 The real image height IH corresponding to the maximum field angle satisfies: d is 0.25 < 1 IH/tan (FOV/2) < 0.35. The front end aperture is small when the optical lens has a large field angle and a large image plane.
In some embodiments, the sum Σct of the total optical length TTL of the optical lens and the central thicknesses of the first lens to the eighth lens along the optical axis respectively satisfies: sigma CT/TTL is 0.5 < 0.6. The total length of the optical lens can be effectively compressed by meeting the range, and the structural design and the production process of the optical lens are facilitated.
For better optical performance of the system, a plurality of aspheric lenses are adopted in the lens, and the shape of each aspheric surface of the optical lens meets the following equation:
wherein z is the distance between the curved surface and the curved surface vertex in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the curved surface vertex, K is the quadric surface coefficient, and A, B, C, D, E, F, G, H is the second, fourth, sixth, eighth, tenth, fourteen and sixteen order surface coefficients respectively.
The application is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present application, but the embodiments of the present application are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present application are intended to be equivalent substitutes within the scope of the present application.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens provided in embodiment 1 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, and filter G1.
A diaphragm ST;
the first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave; the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave; the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave; the fourth lens element L4 has positive refractive power, and both an object-side surface S7 and an image-side surface S8 thereof are convex;
the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex; the sixth lens element L6 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12; the seventh lens element L7 with positive refractive power has a convex object-side surface S13 and a concave image-side surface S14; the eighth lens element L8 has negative focal power, and both the object-side surface S15 and the image-side surface S16 thereof are concave; the object side surface S17 and the image side surface S18 of the optical filter G1 are planes;
the imaging surface S19 is a plane.
The relevant parameters of each lens in the optical lens in example 1 are shown in tables 1-1.
TABLE 1-1
The surface profile parameters of the aspherical lens of the optical lens in example 1 are shown in tables 1 to 2.
TABLE 1-2
In this embodiment, the field curvature curve, the F-tan θ distortion curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 2, 3, 4, 5, and 6, respectively.
Fig. 2 shows a field curvature graph of example 1, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is represented by the horizontal axis representing the amount of shift (unit: mm) and the vertical axis representing the half field angle (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within +/-0.08 mm, which indicates that the optical lens can excellently correct the field curvature.
Fig. 3 shows the F-Tan θ distortion curve of example 1, which represents the F-Tan θ distortion of light rays of different wavelengths at different image heights on the image source surface, the horizontal axis represents the F-Tan θ distortion (unit:%) and the vertical axis represents the half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 2%, which shows that the optical lens can better correct the F-Tan theta distortion.
Fig. 4 shows a Modulation Transfer Function (MTF) graph of example 1, which represents a lens imaging modulation degree representing different spatial frequencies at each view field, the horizontal axis represents spatial frequency (unit: lp/mm), and the vertical axis represents MTF value. As can be seen from the graph, the MTF values of the present embodiment are all above 0.4 in the full field of view, in the range of 0 to 160lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the present embodiment has good imaging quality and good detail resolution at both low frequency and high frequency.
Fig. 5 shows an axial aberration diagram of example 1, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the axial aberration is controlled within ±15 μm, which indicates that the optical lens can correct axial aberration well.
Fig. 6 shows a vertical axis color difference graph of example 1, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-1 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 2
Referring to fig. 7, a schematic structural diagram of an optical lens provided in embodiment 2 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, and filter G1.
A diaphragm ST;
the first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave; the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave; the fourth lens element L4 has positive refractive power, and both an object-side surface S7 and an image-side surface S8 thereof are convex;
the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex; the sixth lens element L6 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12; the seventh lens element L7 with positive refractive power has a convex object-side surface S13 and a concave image-side surface S14; the eighth lens element L8 has negative focal power, and both the object-side surface S15 and the image-side surface S16 thereof are concave; the object side surface S17 and the image side surface S18 of the optical filter G1 are planes;
the imaging surface S19 is a plane.
The relevant parameters of each lens in the optical lens in example 2 are shown in table 2-1.
TABLE 2-1
The surface profile parameters of the aspherical lens of the optical lens in example 2 are shown in tables 2-2.
TABLE 2-2
In this embodiment, the field curvature curve, the F-tan θ distortion curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 8, 9, 10, 11, and 12, respectively.
Fig. 8 shows a field curvature graph of example 2, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is represented by the horizontal axis representing the amount of shift (unit: mm) and the vertical axis representing the half field angle (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within +/-0.05 mm, which indicates that the optical lens can excellently correct the field curvature.
Fig. 9 shows an F-Tan θ distortion curve of example 2, which represents F-Tan θ distortion of light rays of different wavelengths at different image heights on an image source surface, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 2%, which shows that the optical lens can better correct the F-Tan theta distortion.
Fig. 10 shows a Modulation Transfer Function (MTF) graph of example 2, which represents a lens imaging modulation degree representing different spatial frequencies at each view field, the horizontal axis represents spatial frequency (unit: lp/mm), and the vertical axis represents MTF value. As can be seen from the graph, the MTF values of the present embodiment are all above 0.4 in the full field of view, in the range of 0 to 160lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the present embodiment has good imaging quality and good detail resolution at both low frequency and high frequency.
Fig. 11 shows an axial aberration diagram of example 2, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the axial aberration is controlled within ±17 μm, which means that the optical lens can correct the axial aberration well.
Fig. 12 shows a vertical axis color difference graph of example 2, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-0.3 mu m, which shows that the optical lens can excellently correct chromatic aberration of an edge view field and a secondary spectrum of the whole image surface.
Example 3
Referring to fig. 13, a schematic structural diagram of an optical lens provided in embodiment 3 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, and filter G1.
A diaphragm ST;
the first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave; the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave; the fourth lens element L4 has positive refractive power, and both an object-side surface S7 and an image-side surface S8 thereof are convex;
the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex; the sixth lens element L6 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12; the seventh lens element L7 with positive refractive power has a convex object-side surface S13 and a concave image-side surface S14; the eighth lens element L8 has negative focal power, and both the object-side surface S15 and the image-side surface S16 thereof are concave; the object side surface S17 and the image side surface S18 of the optical filter G1 are planes;
the imaging surface S19 is a plane.
The relevant parameters of each lens in the optical lens in example 3 are shown in table 3-1.
TABLE 3-1
The surface profile parameters of the aspherical lens of the optical lens in example 3 are shown in table 3-2.
TABLE 3-2
In this embodiment, the field curvature curve, F-tan θ distortion curve, MTF curve, axial aberration curve, and vertical axis aberration curve of the optical lens are shown in fig. 14, 15, 16, 17, and 18, respectively.
Fig. 14 shows a field curvature graph of example 3, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is represented by the horizontal axis representing the amount of shift (unit: mm) and the vertical axis representing the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane are controlled within +/-0.06 mm, which indicates that the optical lens can excellently correct the field curvature.
Fig. 15 shows an F-Tan θ distortion curve of example 3, which represents F-Tan θ distortion of light rays of different wavelengths at different image heights on an image source surface, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 1.5%, which shows that the optical lens can better correct the F-Tan theta distortion.
Fig. 16 shows a Modulation Transfer Function (MTF) graph of example 3, which represents a lens imaging modulation degree representing different spatial frequencies at each view field, the horizontal axis represents spatial frequency (unit: lp/mm), and the vertical axis represents MTF value. As can be seen from the graph, the MTF values of the present embodiment are all above 0.4 in the full field of view, in the range of 0 to 160lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the present embodiment has good imaging quality and good detail resolution at both low frequency and high frequency.
Fig. 17 shows an axial aberration diagram of example 3, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-5-23 mu m, which shows that the optical lens can well correct the axial aberration.
Fig. 18 shows a vertical axis color difference graph of example 3, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-0.3 mu m, which shows that the optical lens can excellently correct chromatic aberration of an edge view field and a secondary spectrum of the whole image surface.
Referring to table 4, the optical characteristics corresponding to the above embodiments include the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH, the maximum field angle FOV and the numerical value corresponding to each conditional expression in the embodiments.
TABLE 4 Table 4
In summary, the optical lens provided by the application can effectively limit the length of the lens, which is beneficial to realizing miniaturization of the optical lens; the device has large image height, and improves the adaptation range with chip elements; by reasonably matching the lens shape and focal power combination among the lenses, the aberration is reduced, and the imaging quality of the optical lens is improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. An optical lens comprising eight lenses in total, in order from an object side to an imaging plane along an optical axis:
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
a fourth lens element with positive refractive power having convex object-side and image-side surfaces;
a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a seventh lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
the eighth lens with negative focal power has concave object side and concave image side.
2. The optical lens of claim 1, wherein the optical total length TTL and the effective focal length f of the optical lens satisfy: 1.0 < TTL/f < 1.3.
3. The optical lens according to claim 1, wherein the real image height IH and the effective focal length f corresponding to the maximum field angle of the optical lens satisfy: IH/f is more than 1.8 and less than 2.0.
4. The optical lens according to claim 1, wherein the effective focal length f, the maximum field angle FOV, and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: (IH/2)/(f×tan (FOV/2)) of 1.0.ltoreq.1.05.
5. The optical lens of claim 1, wherein a focal length f of the seventh lens 7 Focal length f of the second lens 2 The method meets the following conditions: -0.6 < f 2 /f 7 ＜-1.1。
6. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a combined focal length f of the first lens to the third lens 13 The method meets the following conditions: f is 1.1 < f 13 /f＜1.5。
7. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a combined focal length f of the sixth lens to the eighth lens 68 The method meets the following conditions: -1.1 < f 68 /f＜-1.4。
8. The optical lens of claim 1, wherein a combined focal length f of the first lens to the third lens 13 Combined focal length f with the sixth lens to the eighth lens 68 The method meets the following conditions: -0.9 < f13/f 68 ＜-1.2。
9. The optical lens of claim 1, wherein the maximum field angle FOV of the optical lens, the object-side effective working aperture D of the first lens 1 The real image height IH corresponding to the maximum field angle satisfies: d is 0.25 < 1 /IH/tan(FOV/2)＜0.35。
10. The optical lens according to claim 1, wherein a sum Σct of an optical total length TTL of the optical lens and center thicknesses of the first lens to the eighth lens along an optical axis, respectively, satisfies: sigma CT/TTL is 0.5 < 0.6.
CN202310272231.7A 2023-03-21 2023-03-21 Optical lens Pending CN117148541A (en)

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CN202310272231.7A CN117148541A (en) 2023-03-21 2023-03-21 Optical lens

Publications (1)

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CN117148541A true CN117148541A (en) 2023-12-01

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