CN116400486B - optical lens - Google Patents
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- CN116400486B CN116400486B CN202310675213.3A CN202310675213A CN116400486B CN 116400486 B CN116400486 B CN 116400486B CN 202310675213 A CN202310675213 A CN 202310675213A CN 116400486 B CN116400486 B CN 116400486B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 178
- 238000003384 imaging method Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 38
- 230000005540 biological transmission Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 description 45
- 238000010586 diagram Methods 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 7
- 201000009310 astigmatism Diseases 0.000 description 5
- 230000014509 gene expression Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- 210000001747 pupil Anatomy 0.000 description 3
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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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: a diaphragm; has positive polarityThe object side surface of the first lens with the focal power is a convex surface, and the image side surface of the first lens is a concave surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens having positive optical power; a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; 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 a convex object-side surface and a concave image-side surface; a seventh lens with negative focal power, wherein the object side surface and the image side surface of the seventh lens are concave surfaces; 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: f (f) 3 And/f > 32. The optical lens provided by the application improves the imaging quality and achieves the effects of large view field, large aperture and miniaturization.
Description
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.
The application provides an optical lens, which comprises seven 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 element with negative refractive power having a convex object-side surface and a concave image-side surface;
a third lens having positive optical power;
a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
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 a convex object-side surface and a concave image-side surface;
a seventh lens with negative focal power, wherein the object side surface and the image side surface of the seventh lens are concave surfaces;
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: f (f) 3 /f＞32。
Further preferably, the optical total length TTL and the effective focal length f of the optical lens satisfy: 1.0< TTL/f <1.2.
Further preferably, 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: 0.75<f 1 /f<0.95。
Further preferably, 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<f 4 /f<-15。
Further preferably, 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: -33<f 6 /f<-15。
Further preferably, the focal length f of the fourth lens 4 Focal length f of the sixth lens 6 The method meets the following conditions: 0.9<f 4 /f 6 <1.5。
Further preferably, the third lens has an object-side surface radius of curvature R 5 Radius of curvature R of image side 6 The method meets the following conditions: r is more than or equal to 1.0 5 /R 6 <1.3。
Further preferably, a sum Σct of an optical total length TTL of the optical lens and center thicknesses of the first lens to the seventh lens along an optical axis, respectively, satisfies: sigma CT/TTL is 0.5 < 0.55.
Further preferably, the third lens has an object-side sagittal height Sag 5 Half-caliber d communicated with object side surface 5 The method meets the following conditions: sag (Sag) 5 /d 5 <0.1; the image side surface of the third lens has a sagittal height Sag 6 Half-aperture d with image side surface light transmission 6 The method meets the following conditions: sag (Sag) 6 /d 6 <0.1。
Further preferably, the object side of the sixth lensFacial elevation Sag 11 Half-caliber d communicated with object side surface 11 The method meets the following conditions: -Sag of 0.25 ∈0.ltoreq 11 /d 11 Less than or equal to-0.18; the image side surface of the sixth lens has a sagittal height Sag 12 Half-aperture d with image side surface light transmission 12 The method meets the following conditions: -Sag of 0.29 ∈ 12 /d 12 ≤-0.25。
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 an MTF graph of the optical lens in example 1 of the present application.
Fig. 5 is an axial aberration diagram of the optical lens in embodiment 1 of the present application.
Fig. 6 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 1 of the present application.
Fig. 7 is a schematic structural diagram of an optical lens in embodiment 2 of the present application.
Fig. 8 is a graph showing the field curvature of the optical lens in embodiment 2 of the present application.
FIG. 9 is a graph showing F-tan θ distortion of an optical lens in example 2 of the present application.
Fig. 10 is an MTF graph of the optical lens in example 2 of the present application.
Fig. 11 is an axial aberration diagram of an optical lens in embodiment 2 of the present application.
Fig. 12 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 2 of the present application.
Fig. 13 is a schematic structural diagram of an optical lens in embodiment 3 of the present application.
Fig. 14 is a graph showing the field curvature of the optical lens in embodiment 3 of the present application.
FIG. 15 is a graph showing F-tan θ distortion of an optical lens in example 3 of the present application.
Fig. 16 is an MTF graph of an optical lens in example 3 of the present application.
Fig. 17 is an axial aberration diagram of an optical lens in embodiment 3 of the present application.
Fig. 18 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present application.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the 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: diaphragm, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh 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 object side surface of the second lens is a convex surface, and the image side surface is a concave surface, so that the spherical aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved.
In some embodiments, the third 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.
In some embodiments, the fourth lens element may have negative refractive power, wherein the object-side surface thereof is convex and the image-side surface thereof is concave, so as to balance coma aberration generated by the third lens element and astigmatism of the lens element.
In some embodiments, the fifth 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 fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface, so that various aberrations generated by the optical lens can be balanced, and the imaging quality of the optical lens can be 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 of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface, so that coma aberration generated by the fifth lens and astigmatism of the lens are balanced.
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 and the image side surface of the seventh 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 effective focal length f of the optical lens and the focal length f of the third lens 3 The method meets the following conditions: f (f) 3 And/f > 32. The tolerance characteristic of the lens is guaranteed to be excellent by meeting the range, and a foundation is provided for guaranteeing the yield in the follow-up actual production.
In some embodiments, the optical total length TTL and the effective focal length f of the optical lens satisfy: 1.0< TTL/f <1.2. The optical lens can be compressed to meet the total length of the optical lens and the miniaturization requirement.
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: 0.75<f 1 /f<0.95. The range is satisfied, the first lens has proper positive focal power, the total length of the optical lens can be compressed, the tolerance distribution of the first lens of the optical lens is facilitated, and the yield is ensured in subsequent production.
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<-2.0. The second lens has proper negative focal power, so that the spherical 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 focal length f of the fourth lens 4 The method meets the following conditions: -40<f 4 /f<-15. The fourth lens has proper negative focal power, which is beneficial to balancing the coma generated by the third lens and the astigmatism of the lens.
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: 1.0<f 5 /f<1.2. The range is satisfied, so that the fifth lens has proper positive focal power, 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 sixth lens 6 The method meets the following conditions: -33<f 6 /f<-15. The above range is satisfied, so that the sixth lens can have a proper negative power, the image height can be increased, and the coma aberration generated by the fifth lens and the astigmatism of the lens can be balanced.
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: -0.8<f 7 /f<-0.6. The seventh lens has proper negative focal power, increases image height, and optimizes the optical lensAnd the imaging quality of the optical lens is improved.
In some embodiments, the focal length f of the fourth lens 4 Focal length f with sixth lens 6 The method meets the following conditions: 0.9<f 4 /f 6 <1.5. The optical lens can balance the astigmatism of the optical lens and improve the imaging quality of the optical lens.
In some embodiments, the third lens has an object-side radius of curvature R 5 Radius of curvature R of image side 6 The method meets the following conditions: r is more than or equal to 1.0 5 /R 6 <1.3. Satisfying the above range is advantageous in balancing the spherical aberration generated by the third lens itself.
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 seventh lens along the optical axis respectively satisfies: sigma CT/TTL is 0.5 < 0.55. 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.
In some embodiments, the third lens has an object-side sagittal height Sag 5 Half-caliber d communicated with object side surface 5 The method meets the following conditions: sag (Sag) 5 /d 5 <0.1; image side sagittal height Sag of third lens 6 Half-aperture d with image side surface light transmission 6 The method meets the following conditions: sag (Sag) 6 /d 6 <0.1. The aberration of the off-axis angle can be corrected by satisfying the above range.
In some embodiments, the object side surface of the sixth lens is sagittal height Sag 11 Half-caliber d communicated with object side surface 11 The method meets the following conditions: -Sag of 0.25 ∈0.ltoreq 11 /d 11 Less than or equal to-0.18; image side sagittal height Sag of sixth lens 12 Half-aperture d with image side surface light transmission 12 The method meets the following conditions: -Sag of 0.29 ∈ 12 /d 12 Less than or equal to-0.25. When the above range is satisfied, the effect of increasing the image height can be obtained by utilizing the abrupt change in the shape of the toric lens.
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 requirements of high image height and miniaturization of the optical lens can be effectively balanced by meeting the range.
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)) <1.1. 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 optical back focal length BFL and the effective focal length f of the optical lens satisfy: 0.1< BFL/f <0.2. The optical lens satisfies the above range, and the total optical length of the optical lens can be effectively reduced, thereby realizing miniaturization 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, J is the second, fourth, sixth, eighth, tenth, fourteen, sixteen, eighteen and twenty-order curved surface coefficients respectively.
The application is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present application, but the embodiments of the present application are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present application are intended to be equivalent substitutes within the scope of the present application.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens provided in embodiment 1 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.
A diaphragm ST;
the first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave;
the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex;
the fourth lens element L4 has negative refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave;
the fifth lens element 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 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12;
the seventh lens L7 has negative focal power, and the object side surface S13 and the image side surface S14 are concave surfaces;
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 this embodiment, the field curvature curve, the F-tan θ distortion curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 2, 3, 4, 5, and 6, respectively.
Fig. 2 shows a field curvature graph of example 1, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is represented by the horizontal axis representing the amount of shift (unit: mm) and the vertical axis representing the half field angle (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane are controlled within +/-0.06 mm, which indicates that the optical lens can excellently correct the field curvature.
Fig. 3 shows the F-Tan θ distortion curve of example 1, which represents the F-Tan θ distortion of light rays of different wavelengths at different image heights on the image source surface, the horizontal axis represents the F-Tan θ distortion (unit:%) and the vertical axis represents the half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 4%, which shows that the optical lens can better correct the F-Tan theta distortion.
Fig. 4 shows a Modulation Transfer Function (MTF) graph of example 1, which represents 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. 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-15 mu m to 9 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 +/-4 mu m, which shows that the optical lens can excellently correct chromatic aberration of the edge view field and the secondary spectrum of the whole image surface.
Example 2
Referring to fig. 7, a schematic structural diagram of an optical lens provided in embodiment 2 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.
A diaphragm ST;
the first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave;
the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex;
the fourth lens element L4 has negative refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave;
the fifth lens element 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 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12;
the seventh lens L7 has negative focal power, and the object side surface S13 and the image side surface S14 are concave surfaces;
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 this embodiment, the field curvature curve, the F-tan θ distortion curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 8, 9, 10, 11, and 12, respectively.
Fig. 8 shows a field curvature graph of example 2, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is represented by the horizontal axis representing the amount of shift (unit: mm) and the vertical axis representing the half field angle (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.08 mm to 0.04mm, which indicates that the optical lens can excellently correct the field curvature.
Fig. 9 shows an F-Tan θ distortion curve of example 2, which represents F-Tan θ distortion of light rays of different wavelengths at different image heights on an image source surface, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 5%, which shows that the optical lens can better correct the F-Tan theta distortion.
Fig. 10 shows a Modulation Transfer Function (MTF) graph of example 2, which represents 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. 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-25 mu m to 5 mu m, 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 +/-5 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: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.
A diaphragm ST;
the first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element L2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave;
the third lens element L3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave;
the fourth lens element L4 has negative refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave;
the fifth lens element 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 with negative refractive power has a convex object-side surface S11 and a concave image-side surface S12;
the seventh lens L7 has negative focal power, and the object side surface S13 and the image side surface S14 are concave surfaces;
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 this embodiment, the field curvature curve, F-tan θ distortion curve, MTF curve, axial aberration curve, and vertical axis aberration curve of the optical lens are shown in fig. 14, 15, 16, 17, and 18, respectively.
Fig. 14 shows a field curvature graph of example 3, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is represented by the horizontal axis representing the amount of shift (unit: mm) and the vertical axis representing the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.06 mm to 0.1mm, which indicates that the optical lens can excellently correct the field curvature.
Fig. 15 shows an F-Tan θ distortion curve of example 3, which represents F-Tan θ distortion of light rays of different wavelengths at different image heights on an image source surface, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the graph, the F-Tan theta distortion of the optical lens is controlled within 3%, which shows that the optical lens can better correct the F-Tan theta distortion.
Fig. 16 shows a Modulation Transfer Function (MTF) graph of example 3, which represents 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. 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 graph, the offset of the axial aberration is controlled within-20 mu m to 10 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 +/-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 4, the optical characteristics corresponding to the above embodiments include the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH, the maximum field angle FOV and the numerical value corresponding to each conditional expression in the embodiments.
TABLE 4 Table 4
In summary, the optical lens provided by the application can effectively limit the length of the lens, 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:
a diaphragm;
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a third lens having positive optical power;
a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
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 a convex object-side surface and a concave image-side surface;
a seventh lens with negative focal power, wherein the object side surface and the image side surface of the seventh lens are concave surfaces;
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: f (f) 3 /f＞32；
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<-2.0。
2. The optical lens of claim 1, wherein the optical total length TTL and the effective focal length f of the optical lens satisfy: 1.0< TTL/f <1.2.
3. 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: 0.75<f 1 /f<0.95。
4. The optical lens of claim 1, wherein 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<f 4 /f<-15。
5. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f of the sixth lens 6 The method meets the following conditions: -33<f 6 /f<-15。
6. The optical lens as claimed in claim 1, wherein a focal length f of the fourth lens 4 Focal length f of the sixth lens 6 The method meets the following conditions: 0.9<f 4 /f 6 <1.5。
7. The optical lens as claimed in claim 1, wherein the third lens has an object-side radius of curvature R 5 Radius of curvature R of image side 6 The method meets the following conditions: r is more than or equal to 1.0 5 /R 6 <1.3。
8. 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 seventh lens along an optical axis, respectively, satisfies: sigma CT/TTL is 0.5 < 0.55.
9. The optical lens of claim 1, wherein the third lens has an object side sagittal height Sag 5 Half-caliber d communicated with object side surface 5 The method meets the following conditions: sag (Sag) 5 /d 5 <0.1; the image side surface of the third lens has a sagittal height Sag 6 Half-aperture d with image side surface light transmission 6 The method meets the following conditions: sag (Sag) 6 /d 6 <0.1。
10. The optical lens of claim 1, wherein the sixth lens has an object side sagittal height Sag 11 Half-caliber d communicated with object side surface 11 The method meets the following conditions: -Sag of 0.25 ∈0.ltoreq 11 /d 11 Less than or equal to-0.18; the image side surface of the sixth lens has a sagittal height Sag 12 Half-aperture d with image side surface light transmission 12 The method meets the following conditions: -Sag of 0.29 ∈ 12 /d 12 ≤-0.25。
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| CN112415716A (en) * | 2020-12-04 | 2021-02-26 | 浙江舜宇光学有限公司 | Optical imaging system |
| JP2021182081A (en) * | 2020-05-19 | 2021-11-25 | ＯＦＩＬＭ．Ｊａｐａｎ株式会社 | Imaging lens, imaging apparatus and information terminal |
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| CN114488493A (en) * | 2022-04-18 | 2022-05-13 | 江西联益光学有限公司 | Optical lens |
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