CN116661109A - Optical lens - Google Patents

Optical lens Download PDF

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Publication number
CN116661109A
CN116661109A CN202310910246.1A CN202310910246A CN116661109A CN 116661109 A CN116661109 A CN 116661109A CN 202310910246 A CN202310910246 A CN 202310910246A CN 116661109 A CN116661109 A CN 116661109A
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Prior art keywords
lens
optical lens
optical
image
focal length
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Granted
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CN202310910246.1A
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CN116661109B (en
Inventor
王义龙
熊鑫
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
    • 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

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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 seven lenses in sequence from an object side to an imaging surface along an optical axis: the first lens with negative 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 concave surface, and the image side surface of the third lens is a convex surface; a diaphragm; a fourth lens element with positive refractive power having convex object-side and image-side surfaces; a fifth lens with negative focal power, wherein the object side surface and the image side surface of the fifth lens are concave surfaces; a sixth lens element with positive refractive power having convex object-side and image-side surfaces; a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface; an air gap CT on the optical axis from the first lens to the second lens 12 CT thickness on optical axis with the first lens 1 And a thickness CT of the second lens on the optical axis 2 The method meets the following conditions: 0.15<CT 12 /（CT 1 +CT 2 ）<0.30。

Description

Optical lens
Technical Field
The application relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the increasing development of unmanned aerial vehicle technology, unmanned aerial vehicle takes photo by plane and uses the scope more and more extensively, and the consumer is higher to unmanned aerial vehicle camera lens's requirement more and more contents need a picture to shoot when taking photo by plane for example, and image resolution is not high simultaneously, leads to the image unclear, still has the camera lens distortion very big to lead to image deformation, can't satisfy the requirement of angle of field big, high pixel, and the application scenario is limited.
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 seven lenses in sequence from an object side to an imaging surface along an optical axis:
the first lens with negative 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 concave surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
a fourth lens element with positive refractive power having convex object-side and image-side surfaces;
a fifth lens with negative focal power, wherein the object side surface and the image side surface of the fifth lens are concave surfaces;
a sixth lens element with positive refractive power having convex object-side and image-side surfaces;
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
an air gap CT on the optical axis from the first lens to the second lens 12 CT thickness on optical axis with the first lens 1 And a thickness CT of the second lens on the optical axis 2 The method meets the following conditions: 0.15<CT 12 /（CT 1 +CT 2 ）<0.30。
Further, the effective focal length f of the optical lens, the radian θ corresponding to the maximum half field angle and the real image height IH corresponding to the maximum field angle satisfy: 0.80< (IH/2)/(fXθ) <0.95.
Further, the maximum field angle FOV and the aperture value FNO of the optical lens satisfy: 105.0< FOV/FNO <135.0.
Further, the real image height IH and the entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: 4.8< IH/EPD <5.2.
Further, an effective focal length f of the optical lens and a focal length f of the first lens 1 The method meets the following conditions: -7.5<f 1 /f<-6.5。
Further, 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: -3.2<f 2 /f<-2.8。
Further, an effective focal length f of the optical lens and a focal length f of the seventh lens 7 The method meets the following conditions: -4.5<f 7 /f<-3.5。
Further, the focal length f of the first lens 1 Focal length f of the second lens 2 The method meets the following conditions: 2.1<f 1 /f 2 <2.6。
Further, the first lens object-side surface radius of curvature R 1 Radius of curvature R of the object side surface of the second lens 3 The method meets the following conditions: 0.95<R 1 /R 3 <1.25; the first lens has an image side curvature radius R 2 Radius of curvature R of the image side surface of the second lens 4 The method meets the following conditions: 1.8<R 2 /R 4 <2.0。
Further, a combined focal length f of the first lens and the second lens 12 The effective focal length f of the lens meets the following conditions: 2.2<f 12 /f<2.6。
The optical lens provided by the application can provide a large-field-angle 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 field of view, 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 the relative illuminance of the optical lens in embodiment 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 the relative illuminance of the optical lens in embodiment 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 the relative illuminance of the optical lens in embodiment 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.
Fig. 19 is a schematic diagram of the structure of an optical lens in embodiment 4 of the present application.
Fig. 20 is a graph showing the field curvature of an optical lens in embodiment 4 of the present application.
Fig. 21 is a graph showing the relative illuminance of the optical lens in embodiment 4 of the present application.
Fig. 22 is an MTF graph of the optical lens in example 4 of the present application.
Fig. 23 is an axial aberration diagram of the optical lens in embodiment 4 of the present application.
Fig. 24 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 4 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 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, seven lenses are provided in total, and the lens sequentially comprises from an object side to an image side along an optical axis: the optical lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter.
In some embodiments, the first lens may have negative optical power, which facilitates reducing the tilt angle of incident light rays, thereby achieving effective sharing of the large field of view of the object. The object side surface of the first lens is a convex surface, and the image side surface is a concave surface, so that the light rays with the edge view fields can be collected as much as possible and enter the rear optical lens, and the collection of the light rays with a large angle can be realized.
In some embodiments, the second lens may have negative focal power, which is beneficial to sharing the negative focal power of the front end of the lens, so as to reduce the excessive deflection of light caused by the excessive concentration of the focal power of the first lens, and reduce the difficulty of correcting the off-axis aberration of the optical lens. The object side surface of the second lens is a convex surface, and the image side surface is a concave surface, so that light rays from the edge view field of the first lens can be effectively received, the light ray deflection angle is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the third lens can have positive focal power, which is beneficial to smooth transition of light trend, reduces distortion correction difficulty of the marginal view field and enables the lens to have smaller distortion. The object side surface of the third lens is a concave surface, and the image side surface is a convex surface, so that marginal view field light rays can be effectively converged, and the relative illumination of the optical lens is improved.
In some embodiments, the fourth lens may have positive optical power, which is beneficial to smooth transition of light trend and improves imaging quality of the optical lens. The object side surface and the image side surface of the fourth lens are convex, so that the on-axis aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved.
In some embodiments, the fifth 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 fifth 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 sixth lens may have positive optical power, which is beneficial to smooth transition of light ray trend and improves imaging quality of the optical lens. The object side surface and the image side surface of the sixth lens are convex, so that the on-axis aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved.
In some embodiments, the seventh 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 of the seventh lens is a convex surface, and the image side surface is a concave surface, so that marginal view field optics can be effectively converged, and the relative illumination of the optical lens is improved.
In some embodiments, the optical total length TTL and the effective focal length f of the optical lens satisfy: 8.5< TTL/f <10.0. The imaging system can be further reduced in size and further miniaturized by controlling the ratio of the total optical length TTL to the effective focal length f.
In some embodiments, the effective focal length f of the optical lens satisfies the radian θ corresponding to the maximum half field angle and the real image height IH corresponding to the maximum field angle: 0.80< (IH/2)/(fXθ) <0.95. The requirements are met, the F-theta distortion of the optical lens is well controlled, and the resolution of the optical lens is improved.
In some embodiments, the maximum field angle FOV and aperture value FNO of the optical lens satisfy: 105.0< FOV/FNO <135.0. The above range is satisfied, which is advantageous to expand the angle of view of the optical lens and increase the aperture of the optical lens, realizing the characteristics of wide angle and large aperture. The realization of the wide-angle characteristic is favorable for the optical lens to acquire more scene information, meets the requirement of large-range detection, and is favorable for improving the problem of rapid decrease of the relative brightness of the edge view field caused by the wide angle, thereby being favorable for acquiring more scene information.
In some embodiments, the real image height IH and the entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: 4.8< IH/EPD <5.2. The range is satisfied, so that the width of a light beam entering the optical lens is enlarged, the brightness of the optical lens at an image plane is improved, the generation of dark angles is avoided, and the imaging plane of the optical lens can be enlarged.
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: -7.5<f 1 /f<-6.5. The range is satisfied, the first lens can have proper negative focal power, and the inclination angle of incident light rays is reduced, so that the large view field of the object space is effectively shared.
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: -3.2<f 2 /f<-2.8. 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: 5.5<f 3 /f<6.0. 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 seventh lens 7 The method meets the following conditions: -4.5<f 7 /f<-3.5. The range is satisfied, so that the seventh 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 first lens 1 Focal length f of the second lens 2 The method meets the following conditions: 2.1<f 1 /f 2 <2.6. The range is satisfied, the distribution of the focal length of the front lens of the optical lens can be balanced, the correction pressure of the rear lens on aberration is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the focal length f of the first lens 1 Focal length f of seventh lens 7 The method meets the following conditions: 1.5<f 1 /f 7 <2.0. The optical lens can balance the influence force of the front lens aberration and the correction force of the rear lens aberration of the optical lens, and the imaging quality of the optical lens is improved.
In some embodiments, the combined focal length f of the first lens and the second lens 12 The effective focal length f with the optical lens satisfies: 2.2<f 12 /f<2.6. The optical lens has the advantages that the range is met, the lens group at the front end of the optical lens has strong light deflection capability, the visual angle of the optical lens is increased, and the wide-angle characteristic is realized.
In some embodiments, the first lens object-side radius of curvature R 1 Radius of curvature R of object side surface of second lens 3 The method meets the following conditions: 0.95<R 1 /R 3 <1.25; first lens image-side radius of curvature R 2 And a second lens image-side radius of curvature R 4 The method meets the following conditions: 1.8<R 2 /R 4 <2.0. 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 first lens to second lens are air gap CT on the optical axis 12 Thickness CT on optical axis with first lens 1 And thickness CT of the second lens on the optical axis 2 The method meets the following conditions: 0.15<CT 12 /（CT 1 +CT 2 ）<0.30. The above range is satisfied, the influence of the front lens of the optical lens on the field curvature can be reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the sagittal height Sag of the image side of the first lens 2 Half-caliber d communicated with object side surface 2 The method meets the following conditions: 0.40<Sag 2 /d 2 <0.45; sagittal height Sag of the image side of the second lens 3 Half-aperture d with image side surface light transmission 3 The method meets the following conditions: 0.22<Sag 3 /d 3 <0.29. The above range is satisfied, so that the image side surface of the first lens element is close to the object side surface of the second lens element, which is favorable for reducing the aberration of the off-axis visual field and improving the imaging quality of the optical lens.
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: the first lens L1, the second lens L2, the third lens L3, the stop ST, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element 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 concave, and an image-side surface S6 thereof is convex;
a diaphragm ST;
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, and both the object-side surface S9 and the image-side surface S10 thereof are concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12;
the seventh lens element L7 with negative focal power has a convex object-side surface S13 and a concave image-side surface S14;
the object side surface S15 and the image side surface S16 of the optical filter G1 are planes;
the imaging surface S17 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, 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, 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 to 0.04mm, which indicates that the optical lens can well correct the field curvature.
Fig. 3 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. 4 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 embodiment are above 0.4 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. 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 graph, the offset of the axial aberration is controlled within-6 mu m to 30 mu m, which indicates that the optical lens can better correct the axial aberration.
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 +/-3 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: the first lens L1, the second lens L2, the third lens L3, the stop ST, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element 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 concave, and an image-side surface S6 thereof is convex;
a diaphragm ST;
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, and both the object-side surface S9 and the image-side surface S10 thereof are concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12;
the seventh lens element L7 with negative focal power has a convex object-side surface S13 and a concave image-side surface S14;
the object side surface S15 and the image side surface S16 of the optical filter G1 are planes;
the imaging surface S17 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, 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. 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-0.06 mm to 0.06mm, which indicates that the optical lens can well correct the field curvature.
Fig. 9 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. 10 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 present embodiment are all above 0.5 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 offset of the axial aberration is controlled within-5-25 μm, which indicates that the optical lens can better correct the axial aberration.
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 +/-3 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. 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: the first lens L1, the second lens L2, the third lens L3, the stop ST, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element 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 concave, and an image-side surface S6 thereof is convex;
a diaphragm ST;
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, and both the object-side surface S9 and the image-side surface S10 thereof are concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12;
the seventh lens element L7 with negative focal power has a convex object-side surface S13 and a concave image-side surface S14;
the object side surface S15 and the image side surface S16 of the optical filter G1 are planes;
the imaging surface S17 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, 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. 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 is controlled within-0.09 mm to 0.03mm, which indicates that the optical lens can well correct the field curvature.
Fig. 15 shows a graph of relative illuminance for example 3, 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 30% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 16 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 0.4 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. 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-3 mu m to 30 mu m, which indicates that the optical lens can better 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 +/-3 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. 19, 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: the first lens L1, the second lens L2, the third lens L3, the stop ST, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element 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 concave, and an image-side surface S6 thereof is convex;
a diaphragm ST;
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, and both the object-side surface S9 and the image-side surface S10 thereof are concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S11 and a convex image-side surface S12;
the seventh lens element L7 with negative focal power has a convex object-side surface S13 and a concave image-side surface S14;
the object side surface S15 and the image side surface S16 of the optical filter G1 are planes;
the imaging surface S17 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, 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. 20, 21, 22, 23, and 24, respectively.
Fig. 20 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 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-0.12 mm to 0.03mm, which indicates that the optical lens can well correct the field curvature.
Fig. 21 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. 22 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 0.4 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. 23 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 graph, the offset of the axial aberration is controlled within-10 mu m to 25 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 24 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, seven lenses altogether, characterized in that, from the object side to the imaging plane along the optical axis, are:
the first lens with negative 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 concave surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
a fourth lens element with positive refractive power having convex object-side and image-side surfaces;
a fifth lens with negative focal power, wherein the object side surface and the image side surface of the fifth lens are concave surfaces;
a sixth lens element with positive refractive power having convex object-side and image-side surfaces;
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
an air gap CT on the optical axis from the first lens to the second lens 12 CT thickness on optical axis with the first lens 1 And a thickness CT of the second lens on the optical axis 2 The method meets the following conditions: 0.15<CT 12 /（CT 1 +CT 2 ）<0.30。
2. The optical lens according to claim 1, wherein the effective focal length f of the optical lens satisfies radian θ corresponding to a maximum half field angle and a real image height IH corresponding to a maximum field angle: 0.80< (IH/2)/(fXθ) <0.95.
3. The optical lens according to claim 1, wherein the maximum field angle FOV and aperture value FNO of the optical lens satisfy: 105.0< FOV/FNO <135.0.
4. The optical lens according to claim 1, wherein the real image height IH and the entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: 4.8< IH/EPD <5.2.
5. The optical lens of claim 1, wherein an effective focal length f of the optical lens is equal to a focal length f of the first lens 1 The method meets the following conditions: -7.5<f 1 /f<-6.5。
6. 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: -3.2<f 2 /f<-2.8。
7. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f of the seventh lens 7 The method meets the following conditions: -4.5<f 7 /f<-3.5。
8. The optical lens of claim 1, wherein the focal length f of the first lens 1 Focal length f of the second lens 2 The method meets the following conditions: 2.1<f 1 /f 2 <2.6。
9. The optical lens of claim 1 wherein the first lens object-side radius of curvature R 1 Radius of curvature R of the object side surface of the second lens 3 The method meets the following conditions: 0.95<R 1 /R 3 <1.25; the first lens has an image side curvature radius R 2 Radius of curvature R of the image side surface of the second lens 4 The method meets the following conditions: 1.8<R 2 /R 4 <2.0。
10. The optical lens of claim 1, wherein a combined focal length f of the first lens and the second lens 12 The effective focal length f of the lens meets the following conditions: 2.2<f 12 /f<2.6。
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US20200393657A1 (en) * 2018-07-05 2020-12-17 Zhejiang Sunny Optical Co., Ltd. Optical imaging lens group
CN114815167A (en) * 2022-05-27 2022-07-29 江西晶超光学有限公司 Optical system, camera module and electronic equipment
CN114879343A (en) * 2022-05-08 2022-08-09 中山联拓光学有限公司 Panoramic lens and imaging device
CN115826204A (en) * 2021-09-16 2023-03-21 新巨科技股份有限公司 Imaging lens group and camera module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200393657A1 (en) * 2018-07-05 2020-12-17 Zhejiang Sunny Optical Co., Ltd. Optical imaging lens group
CN208705559U (en) * 2018-08-02 2019-04-05 浙江舜宇光学有限公司 Optical imaging lens
CN115826204A (en) * 2021-09-16 2023-03-21 新巨科技股份有限公司 Imaging lens group and camera module
CN114879343A (en) * 2022-05-08 2022-08-09 中山联拓光学有限公司 Panoramic lens and imaging device
CN114815167A (en) * 2022-05-27 2022-07-29 江西晶超光学有限公司 Optical system, camera module and electronic equipment

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