CN116594154B - Optical lens - Google Patents

Optical lens Download PDF

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Publication number
CN116594154B
CN116594154B CN202310857859.3A CN202310857859A CN116594154B CN 116594154 B CN116594154 B CN 116594154B CN 202310857859 A CN202310857859 A CN 202310857859A CN 116594154 B CN116594154 B CN 116594154B
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lens
optical
optical lens
image
focal length
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CN202310857859.3A
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CN116594154A (en
Inventor
王义龙
李亮
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Jiangxi Lianyi Optics Co Ltd
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Jiangxi Lianyi Optics Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • 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

Abstract

The application provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis: a diaphragm; the first lens with positive focal power has a convex object side surface and a concave image side surface; a second lens having negative optical power, the image side surface of which is concave; a third lens having negative optical power; a fourth lens having positive optical power; a fifth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with negative refractive power having concave object-side and image-side surfaces; an effective focal length f of the optical lens and a focal length f of the fourth lens 4 The method meets the following conditions: 40.0<f 4 /f<120.0。

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 requirement that the imaging lens has a light, thin, short, small shape and high-pixel, high-resolution characteristics, the imaging lens at the product end is required to have a wider field angle. The wide-angle lens has the characteristics of short focal length, long depth of view, large angle of view and the like, and can acquire more information under the same condition.
In view of this, the present application provides an optical lens having characteristics of large aperture, excellent imaging quality, wide angle, etc., and also having miniaturization, and being suitable for portable electronic products.
Disclosure of Invention
In view of the above problems, an object of the present application is to provide an optical lens having the advantages of a large field of view, a large aperture, and miniaturization.
An optical lens comprises six lenses in sequence from an object side to an imaging surface along an optical axis:
a diaphragm;
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens having negative optical power, the image side surface of which is concave;
a third lens having negative optical power;
a fourth lens having positive optical power;
a fifth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens element with negative refractive power having concave object-side and image-side surfaces;
an effective focal length f of the optical lens and a focal length f of the fourth lens 4 The method meets the following conditions: 40.0<f 4 /f<120.0。
Further preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.75< IH/f <1.95.
Further preferably, the effective focal length f of the optical lens and the focal length f of the second lens 2 The method meets the following conditions: -3.0<f 2 /f<-1.5。
Further preferably, the effective focal length f of the optical lens and the focal length f of the third lens 3 The method meets the following conditions: -50.0<f 3 /f<-11.0。
Further preferably, the focal length f of the second lens 2 Focal length f of the third lens 3 The method meets the following conditions: 5.0<f 3 /f 2 <20.0。
Further preferably, the fourth lens object-side radius of curvature R 7 Radius of curvature R of image side 8 The method meets the following conditions:。
further preferably, the effective focal length f of the optical lens and the air gap CT of the fourth lens to the fifth lens on the optical axis 45 The method meets the following conditions: CT is more than or equal to 0.10 45 /f<0.15; an effective focal length f of the optical lens and an air gap CT of the fifth lens to the sixth lens on an optical axis 56 The method meets the following conditions: 0.15<CT 56 /f<0.25。
Further preferably, the object side surface of the fourth lens has a sagittal height Sag 7 Half-caliber d communicated with object side surface 7 The method meets the following conditions: -0.25<Sag 7 /d 7 Less than or equal to-0.1; the image side surface of the fourth lens has a sagittal height Sag 8 Half-aperture d with image side surface light transmission 8 The method meets the following conditions: -0.3<Sag 8 /d 8 <0。
Further preferably, the fifth lens has an object-side sagittal height Sag 9 Half-caliber d communicated with object side surface 9 The method meets the following conditions:-0.30<Sag 9 /d 9 <-0.12; the image side surface of the fifth lens has a sagittal height Sag 10 Half-aperture d with image side surface light transmission 10 The method meets the following conditions: -0.50<Sag 10 /d 10 <-0.30。
Further preferably, a sum Σct of an optical total length TTL of the optical lens and center thicknesses of the first lens to the sixth lens along an optical axis, respectively, satisfies: sigma CT/TTL is 0.4 < 0.5.
The optical lens provided by the application can effectively limit the length of the lens, is favorable for realizing miniaturization of the optical lens, improves the resolution of the optical lens, reduces aberration, improves the imaging quality of the optical lens and realizes the effects of large view field, large aperture and miniaturization through reasonable configuration of the lens surfaces and reasonable collocation of optical power.
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 a graph showing the relative illuminance of the optical lens in embodiment 1 of the present application.
Fig. 5 is an MTF graph of the optical lens in example 1 of the present application.
Fig. 6 is an axial aberration diagram of the optical lens in embodiment 1 of the present application.
Fig. 7 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 1 of the present application.
Fig. 8 is a schematic structural diagram of an optical lens in embodiment 2 of the present application.
Fig. 9 is a graph showing a field curvature of an optical lens in embodiment 2 of the present application.
FIG. 10 is a graph showing F-tan θ distortion of an optical lens in example 2 of the present application.
Fig. 11 is a graph showing the relative illuminance of the optical lens in embodiment 2 of the present application.
Fig. 12 is an MTF graph of the optical lens in example 2 of the present application.
Fig. 13 is an axial aberration diagram of an optical lens in embodiment 2 of the present application.
Fig. 14 is a vertical axis chromatic aberration chart of the optical lens in embodiment 2 of the present application.
Fig. 15 is a schematic structural diagram of an optical lens in embodiment 3 of the present application.
Fig. 16 is a graph showing the field curvature of an optical lens in embodiment 3 of the present application.
FIG. 17 is a graph showing F-tan θ distortion of an optical lens in example 3 of the present application.
Fig. 18 is a graph showing the relative illuminance of the optical lens in embodiment 3 of the present application.
Fig. 19 is an MTF graph of the optical lens in example 3 of the present application.
Fig. 20 is an axial aberration diagram of an optical lens in embodiment 3 of the present application.
Fig. 21 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present application.
Fig. 22 is a schematic structural diagram of an optical lens in embodiment 4 of the present application.
Fig. 23 is a graph showing a field curvature of an optical lens in embodiment 4 of the present application.
FIG. 24 is a graph showing F-tan θ distortion of an optical lens in example 4 of the present application.
Fig. 25 is a graph showing the relative illuminance of the optical lens in embodiment 4 of the present application.
Fig. 26 is an MTF graph of the optical lens in example 4 of the present application.
Fig. 27 is an axial aberration diagram of an optical lens in embodiment 4 of the present application.
Fig. 28 is a vertical axis chromatic aberration chart of the optical lens in embodiment 4 of the 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 object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
According to the optical lens of the embodiment of the application, six lenses are provided in order from an object side to an image side along an optical axis: diaphragm, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and light filter.
In some embodiments, the first lens may have positive optical power, which is beneficial to converging light while reducing the light deflection angle, so that the light trend is smoothly transited. The object side surface of the first lens is a convex surface, and the image side surface is a concave surface, so that the converging light rays can be effectively converged, and the optical total length of the optical lens can be effectively compressed.
In some embodiments, the second lens may have a negative power, which is advantageous for reducing the angle of light deflection, allowing smooth transition of the light profile. The second lens is concave on the image side surface, so that the converging of marginal view field light rays is facilitated, and the converged light rays smoothly enter the rear-end optical system.
In some embodiments, the third lens can have negative focal power, which is favorable for smooth transition of light trend, reduces distortion correction difficulty of the marginal view field, enables the lens to have smaller distortion, and improves imaging quality of the optical lens.
In some embodiments, the fourth lens can have positive focal power, which is beneficial to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.
In some embodiments, the fifth lens element may have positive optical power, so as to balance various aberrations generated by the optical lens element and improve imaging quality of the optical lens element. The object side surface of the fifth lens is a concave surface, and the image side surface is a convex surface, so that the light rays of the edge view field can be collected, and the relative illumination of the optical lens is improved.
In some embodiments, the sixth lens may have negative optical power, which is beneficial to increasing the imaging area of the optical lens and improving the imaging quality of the optical lens. The object side surface and the image side surface of the sixth lens are concave surfaces, so that the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens can be improved.
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 optical lens can be compressed to meet the total length of the optical lens and the miniaturization requirement.
In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 0.55< TTL/IH <0.65. The lens meets the range, is favorable for realizing the ultrathin lens, has a larger image surface and can be matched with a chip with a larger size.
In some embodiments, the effective focal length f of the optical lens and the maximum field angle FOV and the real image height IH corresponding to the maximum field angle satisfy: 1.0< (IH/2)/(f×tan (FOV/2)) <1.05. The requirements are met, the optical distortion of the optical lens is well controlled, and the resolution of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.75< IH/f <1.95. 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 of the optical lens is equal to the focal length f of the first lens 1 The method meets the following conditions: 0.65<f 1 /f<1.0. The range is satisfied, so that the first lens has proper positive focal power, can effectively collect the converging light rays, and can effectively compress the total optical length of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens 2 The method meets the following conditions: -3.0<f 2 /f<-1.5. The second lens has proper negative focal power, which is beneficial to reducing the deflection angle of light and enabling the trend of the light to be in stable transition.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the third lens 3 The method meets the following conditions: -50.0<f 3 /f<-11.0. The optical lens meets the above range, is favorable for smooth transition of light trend, reduces distortion correction difficulty of an edge view field, enables the lens to have smaller distortion, and improves imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fourth lens 4 The method meets the following conditions: 40.0<f 4 /f<120.0. The range is satisfied, so that smooth light trend is facilitated, the influence of aberration generated by the fourth lens on the imaging quality of the optical lens is reduced, various aberrations generated by the optical lens are balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 The method meets the following conditions: 0.9<f 5 /f<1.1. The range is satisfied, the fifth lens has proper positive focal power, the excellent tolerance characteristic of the lens can be ensured, and a foundation is provided for the quality assurance in the follow-up actual production.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the sixth lens 6 The method meets the following conditions: -0.8<f 6 /f<-0.6. The range is satisfied, so that the sixth lens has proper negative focal power, the image height is increased, the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens is improved.
In some embodiments, the focal length f of the second lens 2 Focal length f of the third lens 3 The method meets the following conditions: 5.0<f 3 /f 2 <20.0. The optical lens can balance the astigmatism of the optical lens and improve the imaging quality of the optical lens.
In some embodiments, the fourth lens object-side radius of curvature R 7 Radius of curvature R of image side 8 The method meets the following conditions:. The axial aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved.
In some embodiments, the effective focal length f of the optical lens and the air gap CT of the fourth lens to the fifth lens on the optical axis 45 And air gap CT of fifth lens to sixth lens on optical axis 56 The method meets the following conditions: CT is more than or equal to 0.10 45 /f<0.15，0.15<CT 56 /f<0.25. The above range is satisfied, the influence of aberration such as spherical aberration, coma aberration and astigmatism of the optical lens can be reduced, and the imaging quality of the optical lens can be improved.
In some embodiments, the thickness CT of the optical lens second lens on the optical axis 2 Lens thickness ET at the optical effective diameter of the second lens 2 The method meets the following conditions: 0.60<CT 2 /ET 2 <0.75. The problem that the center of the lens is too thin and the edge of the lens is too thick in the forming process due to the fact that the thickness ratio of the lens is too small can be avoided by reasonably controlling the thickness ratio of the second lens, and the yield of the lens is improved; meanwhile, the overall length of the optical lens is prolonged due to the fact that the thickness ratio is too small, and miniaturization of the optical lens is not facilitated.
In some embodiments, the fourth lens has an object side sagittal height Sag 7 Half-caliber d communicated with object side surface 7 The method meets the following conditions: -0.25<Sag 7 /d 7 Less than or equal to-0.1; image-side sagittal height Sag of fourth lens 8 Half-aperture d with image side surface light transmission 8 The method meets the following conditions: -0.3<Sag 8 /d 8 <0. The optical lens meets the range, is beneficial to reducing the influence of the spherical aberration of the fourth lens on the imaging quality of the optical lens, reduces the scattering of light rays, and improves the transmittance and the imaging quality of the optical lens.
In some embodiments, the fifth lens has an object-side sagittal height Sag 9 Half-caliber d communicated with object side surface 9 The method meets the following conditions: -0.30<Sag 9 /d 9 <-0.12; image-side sagittal height Sag of fifth lens 10 Half-aperture d with image side surface light transmission 10 The method meets the following conditions: -0.50<Sag 10 /d 10 <-0.30. The above range is satisfied, so that the distortion of the optical lens can be reduced, and the imaging quality of the optical lens can be improved.
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 sixth lens along the optical axis respectively satisfies: sigma CT/TTL is 0.4 < 0.5. 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, I and J are the second, fourth, sixth, eighth, tenth, fourteen, sixteen, eighteenth and twenty-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, 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 L2 has negative focal power, and the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens element L3 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 L4 has positive refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is convex;
the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex;
the sixth lens element L6 has negative refractive power, and both the object-side surface S11 and the image-side surface S12 thereof are concave;
the object side surface S13 and the image side surface S14 of the optical filter G1 are planes;
the imaging surface S15 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 the present embodiment, a field curve graph, an F-tan θ distortion graph, a relative illuminance graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 2, 3, 4, 5, 6, and 7, 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-0.05 mm to 0.15mm, which indicates that the optical lens can well correct the field curvature.
Fig. 3 shows an F-Tan θ distortion graph of example 1, in which F-Tan θ distortion of light rays of different wavelengths at different image heights on an image source surface is represented by the horizontal axis representing F-Tan θ distortion (unit:%) and the vertical axis representing half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 0-3%, which shows that the optical lens can well correct the F-Tan theta distortion.
Fig. 4 shows a graph of relative illuminance for example 1, which represents relative illuminance values for different field angles on an imaging plane, with the horizontal axis representing half field angle (in: °), and the vertical axis representing relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 40% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 5 shows a Modulation Transfer Function (MTF) graph of example 1, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the 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. 6 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 offset of the axial aberration is controlled within-30 mu m to 30 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 7 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 +/-2 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. 8, 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, 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 L2 has negative focal power, and the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex;
the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave;
the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex;
the sixth lens element L6 has negative refractive power, and both the object-side surface S11 and the image-side surface S12 thereof are concave;
the object side surface S13 and the image side surface S14 of the optical filter G1 are planes;
the imaging surface S15 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 the present embodiment, a field curve graph, an F-tan θ distortion graph, a relative illuminance graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 9, 10, 11, 12, 13, and 14, respectively.
Fig. 9 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 angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.1 mm to 0.15mm, which indicates that the optical lens can well correct the field curvature.
Fig. 10 shows an F-Tan θ distortion graph of example 2, in which F-Tan θ distortion of light rays of different wavelengths at different image heights on an image source surface is represented by the horizontal axis representing F-Tan θ distortion (unit:%) and the vertical axis representing half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 0-3%, which shows that the optical lens can well correct the F-Tan theta distortion.
Fig. 11 shows a graph of relative illuminance for example 2, which shows relative illuminance values for different field angles on an imaging plane, with the horizontal axis representing half field angle (in: °), and the vertical axis representing relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 40% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 12 shows a Modulation Transfer Function (MTF) graph of example 2, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is evenly and smoothly reduced in the process of viewing from the center to the edge, and the imaging quality and detail resolution capability are better under the conditions of low frequency and high frequency.
Fig. 13 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 graph, the offset of the axial aberration is controlled within-40 mu m to 50 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 14 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 +/-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 3
Referring to fig. 15, 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, 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 L2 has negative focal power, and the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex;
the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave;
the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex;
the sixth lens element L6 has negative refractive power, and both the object-side surface S11 and the image-side surface S12 thereof are concave;
the object side surface S13 and the image side surface S14 of the optical filter G1 are planes;
the imaging surface S15 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 the present embodiment, a field curve graph, an F-tan θ distortion graph, a relative illuminance graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 16, 17, 18, 19, 20, and 21, respectively.
Fig. 16 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 is controlled within-0.1 mm to 0.15mm, which indicates that the optical lens can well correct the field curvature.
Fig. 17 shows an F-Tan θ distortion graph of example 3, in which F-Tan θ distortion of light rays of different wavelengths at different image heights on an image source surface is represented by the horizontal axis representing F-Tan θ distortion (unit:%) and the vertical axis representing half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 0-3%, which shows that the optical lens can well correct the F-Tan theta distortion.
Fig. 18 shows a graph of relative illuminance of example 3, which represents relative illuminance values at different view angles on an imaging plane, with the horizontal axis representing half view angle (unit: °), and the vertical axis representing relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 40% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 19 shows a Modulation Transfer Function (MTF) graph of example 3, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is evenly and smoothly reduced in the process of viewing from the center to the edge, and the imaging quality and detail resolution capability are better under the conditions of low frequency and high frequency.
Fig. 20 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 graph, the offset of the axial aberration is controlled within-40 mu m to 40 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 21 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 +/-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 4
Referring to fig. 22, a schematic structural diagram of an optical lens provided in embodiment 4 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, 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 negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex;
the fourth lens element L4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave;
the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex;
the sixth lens element L6 has negative refractive power, and both the object-side surface S11 and the image-side surface S12 thereof are concave;
the object side surface S13 and the image side surface S14 of the optical filter G1 are planes;
the imaging surface S15 is a plane.
The relevant parameters of each lens in the optical lens in example 4 are shown in table 4-1.
TABLE 4-1
The surface profile parameters of the aspherical lens of the optical lens in example 4 are shown in table 4-2.
TABLE 4-2
In the present embodiment, a field curve graph, an F-tan θ distortion graph, a relative illuminance graph, an MTF graph, an axial aberration graph, and a vertical axis aberration graph of the optical lens are shown in fig. 23, 24, 25, 26, 27, and 28, respectively.
Fig. 23 shows a field curvature graph of example 4, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is shown, the horizontal axis represents the amount of shift (unit: mm), and the vertical axis represents the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.15mm, which indicates that the optical lens can well correct the field curvature.
Fig. 24 shows an F-Tan θ distortion graph of example 4, in which F-Tan θ distortion at different image heights on an image source surface is represented by light rays of different wavelengths, 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 0-4%, which shows that the optical lens can well correct the F-Tan theta distortion.
Fig. 25 shows a graph of relative illuminance of example 4, which represents relative illuminance values at different view angles on an imaging plane, with the horizontal axis representing half view angle (unit: °), and the vertical axis representing relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 40% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 26 shows a Modulation Transfer Function (MTF) graph of example 4, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is evenly and smoothly reduced in the process of viewing from the center to the edge, and the imaging quality and detail resolution capability are better under the conditions of low frequency and high frequency.
Fig. 27 shows an axial aberration diagram of example 4, 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-50 mu m to 50 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 28 shows a vertical axis color difference graph of example 4, 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 +/-2 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.
Referring to table 5, 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 5
In summary, the optical lens provided by the application can effectively limit the length of the lens, is beneficial to realizing miniaturization of the optical lens, improves the resolution of the optical lens, reduces aberration, improves the imaging quality of the optical lens and realizes the effects of large field of view, large aperture and miniaturization through reasonable configuration of the lens surfaces and reasonable collocation of optical power.
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, six lens altogether, characterized by, along the optical axis from the object side to the imaging plane in order:
a diaphragm;
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens having negative optical power, the image side surface of which is concave;
a third lens having negative optical power;
a fourth lens having positive optical power;
a fifth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens element with negative refractive power having concave object-side and image-side surfaces;
an effective focal length f of the optical lens and a focal length f of the fourth lens 4 The method meets the following conditions: 40.0<f 4 /f<120.0；
The real image height IH corresponding to the effective focal length f and the maximum field angle of the optical lens meets the following conditions: 1.75< IH/f <1.95.
2. The optical lens according to claim 1, wherein the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 1.75< IH/f <1.95.
3. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f of the second lens 2 The method meets the following conditions: -3.0<f 2 /f<-1.5。
4. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f of the third lens 3 The method meets the following conditions: -50.0<f 3 /f<-11.0。
5. The optical lens of claim 1, wherein the focal length f of the second lens 2 Focal length f of the third lens 3 The method meets the following conditions: 5.0<f 3 /f 2 <20.0。
6. The optical lens of claim 1, wherein the fourth lens object-side radius of curvature R 7 Radius of curvature R of image side 8 The method meets the following conditions:。
7. the optical lens as claimed in claim 1, wherein an effective focal length f of the optical lens and an air gap CT of the fourth lens to the fifth lens on an optical axis 45 The method meets the following conditions: CT is more than or equal to 0.10 45 /f<0.15; an effective focal length f of the optical lens and an air gap CT of the fifth lens to the sixth lens on an optical axis 56 The method meets the following conditions: 0.15<CT 56 /f<0.25；。
8. The optical lens of claim 1, wherein the fourth lens has an object side sagittal height Sag 7 Half-caliber d communicated with object side surface 7 The method meets the following conditions: -0.25<Sag 7 /d 7 Less than or equal to-0.1; the image side surface of the fourth lens has a sagittal height Sag 8 Half-aperture d with image side surface light transmission 8 The method meets the following conditions: -0.3<Sag 8 /d 8 <0。
9. The optical lens of claim 1, wherein the fifth lens has an object side sagittal height Sag 9 Half-caliber d communicated with object side surface 9 The method meets the following conditions: -0.30<Sag 9 /d 9 <-0.12; the image side surface of the fifth lens has a sagittal height Sag 10 Half-aperture d with image side surface light transmission 10 The method meets the following conditions: -0.50<Sag 10 /d 10 <-0.30。
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 sixth lens along an optical axis, respectively, satisfies: sigma CT/TTL is 0.4 < 0.5.
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CN105487201A (en) * 2015-12-14 2016-04-13 浙江舜宇光学有限公司 Ultrathin lens
CN112462490A (en) * 2019-09-06 2021-03-09 大立光电股份有限公司 Photographing optical lens, image capturing device and electronic device
WO2022120678A1 (en) * 2020-12-10 2022-06-16 欧菲光集团股份有限公司 Optical system, image capturing module and electronic device
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