CN117406398B - Optical lens - Google Patents
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- CN117406398B CN117406398B CN202311715781.8A CN202311715781A CN117406398B CN 117406398 B CN117406398 B CN 117406398B CN 202311715781 A CN202311715781 A CN 202311715781A CN 117406398 B CN117406398 B CN 117406398B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 219
- 238000003384 imaging method Methods 0.000 claims abstract description 57
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Classifications
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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
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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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- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention provides an optical lens, seven lenses altogether, including in order from the object side to the imaging plane along the optical axis: the first lens with positive focal power has a concave object side surface and a convex image side surface; a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex; a fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element with positive refractive power having convex object-side and image-side surfaces; the object side surface of the seventh lens with negative focal power is a convex surface, and the image side surface of the seventh lens is a concave surface. The optical lens provided by the invention improves the imaging quality of the optical lens, reduces the aberration and improves the imaging quality of the optical lens through reasonable configuration of the surface types of the lenses and reasonable collocation of the focal power.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
Along with the continuous improvement of the requirements of people on driving experience, the vehicle-mounted application optical lens is increasingly used in intelligent driving, and the position of the vehicle-mounted optical lens in the related industries of automobiles is continuously improved.
Advanced Driving Assistance Systems (ADASs) play an important role in intelligent driving, and collect environmental information through various lenses in combination with sensors to ensure driving safety of drivers. The lens of the existing ADAS system needs longer focal length in long-distance imaging, but longer focal length can cause longer total length of the lens, which is unfavorable for miniaturization of the lens. Meanwhile, the lens needs a larger aperture, so that the lens has good imaging quality at night or in an environment with weaker illumination condition. Therefore, there is a need to develop an optical lens that has a reduced size in the long focal length, is low in cost, has high resolution, and can be used in low light and severe environments.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an optical lens that is compact in size, low in cost, high in resolution, and capable of being used in low light and severe environments.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an optical lens comprising seven lenses in order from an object side to an imaging surface along an optical axis:
the first lens with positive focal power has a concave object side surface and a convex image side surface;
a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
a fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave;
a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
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;
the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.9< f1/f2<1.1.
Further preferably, the object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy: (R1+R2)/(R1-R2) > 10.0.
Further preferably, the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: (R3+R4)/(R3-R4) > 5.0.
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: 0.6< ΣCT/TTL <1.0.
Further preferably, the optical total length TTL and the effective focal length f of the optical lens satisfy: TTL/f <2.8.
Further preferably, the effective focal length f of the optical lens and the real image height ih corresponding to the maximum field angle FOV and the maximum half field angle satisfy: 1.0< ih/(f×tan (FOV/2)) <1.1.
Further preferably, the maximum field angle FOV and the aperture value FNO of the optical lens satisfy: 12.0 < FOV/FNO < 20.0.
Further preferably, the effective focal length f and the optical back focal length BFL of the optical lens satisfy: BFL/f > 0.3.
Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0< f1/f <6.0.
Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0< f2/f <6.0.
The optical lens provided by the invention improves the imaging quality of the optical lens, reduces the aberration and improves the imaging quality of the optical lens through reasonable configuration of the surface types of the lenses and reasonable collocation of the focal power, and realizes the effects of miniaturization of long focus, high resolution of low cost and application in weak light and severe environments.
Drawings
The foregoing and/or additional aspects and advantages of the invention 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 invention.
Fig. 2 is a graph showing a field curvature of an optical lens in embodiment 1 of the present invention.
FIG. 3 is a graph showing F-Tanθ distortion of an optical lens in example 1 of the present invention.
Fig. 4 is a graph showing the relative illuminance of the optical lens in embodiment 1 of the present invention.
Fig. 5 is an MTF graph of the optical lens in example 1 of the present invention.
Fig. 6 is an axial aberration diagram of the optical lens in embodiment 1 of the present invention.
Fig. 7 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 1 of the present invention.
Fig. 8 is a schematic structural diagram of an optical lens in embodiment 2 of the present invention.
Fig. 9 is a graph showing a field curvature of an optical lens in embodiment 2 of the present invention.
FIG. 10 is a graph showing F-Tanθ distortion of an optical lens in example 2 of the present invention.
Fig. 11 is a graph showing the relative illuminance of the optical lens in embodiment 2 of the present invention.
Fig. 12 is an MTF graph of the optical lens in example 2 of the present invention.
Fig. 13 is an axial aberration diagram of an optical lens in embodiment 2 of the present invention.
Fig. 14 is a vertical axis chromatic aberration chart of the optical lens in embodiment 2 of the present invention.
Fig. 15 is a schematic structural diagram of an optical lens in embodiment 3 of the present invention.
Fig. 16 is a graph showing the field curvature of an optical lens in embodiment 3 of the present invention.
FIG. 17 is a graph showing F-Tanθ distortion of an optical lens in example 3 of the present invention.
Fig. 18 is a graph showing the relative illuminance of the optical lens in embodiment 3 of the present invention.
Fig. 19 is an MTF graph of the optical lens in example 3 of the present invention.
Fig. 20 is an axial aberration diagram of an optical lens in embodiment 3 of the present invention.
Fig. 21 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present invention.
Fig. 22 is a schematic structural diagram of an optical lens in embodiment 4 of the present invention.
Fig. 23 is a graph showing a field curvature of an optical lens in embodiment 4 of the present invention.
FIG. 24 is a graph showing F-Tanθ distortion of an optical lens in example 4 of the present invention.
Fig. 25 is a graph showing the relative illuminance of the optical lens in embodiment 4 of the present invention.
Fig. 26 is an MTF graph of the optical lens in example 4 of the present invention.
Fig. 27 is an axial aberration diagram of an optical lens in embodiment 4 of the present invention.
Fig. 28 is a vertical axis chromatic aberration chart of the optical lens in embodiment 4 of the invention.
Fig. 29 is a schematic diagram of the structure of an optical lens in embodiment 5 of the present invention.
Fig. 30 is a graph showing the field curvature of an optical lens in example 5 of the present invention.
FIG. 31 is a graph showing F-Tanθ distortion of an optical lens in example 5 of the present invention.
Fig. 32 is a graph showing the relative illuminance of the optical lens in embodiment 5 of the present invention.
Fig. 33 is an MTF graph of the optical lens in example 5 of the present invention.
Fig. 34 is an axial aberration diagram of the optical lens in embodiment 5 of the present invention.
Fig. 35 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 5 of the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of the present application and are not intended to limit the scope of the present 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 invention.
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 present application, use of "may" means "one or more embodiments of the present 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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The optical lens of the embodiment of the invention sequentially comprises from an object side to an imaging surface along an optical axis: the optical lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an optical filter and protective glass.
In some embodiments, the first lens element may have positive optical power, with the object-side surface being concave and the image-side surface being convex. The second lens element may have positive refractive power, wherein the object-side surface thereof is concave and the image-side surface thereof is convex. The third lens may have positive optical power, and both the object side and the image side thereof are convex. The fourth lens element may have negative refractive power, and both the object-side surface and the image-side surface thereof may be concave. The fifth lens element may have positive refractive power, wherein an object-side surface thereof is convex and an image-side surface thereof is concave. The sixth lens element may have positive refractive power, and both the object-side surface and the image-side surface thereof are convex. The seventh lens element may have negative refractive power, wherein the object-side surface thereof is convex and the image-side surface thereof is concave.
In some embodiments, the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.9< f1/f2<1.1. The range is satisfied, and the main surface of the optical lens moves forward, so that the focal length of the optical lens can be increased, and the optical lens has the characteristics of small visual field and long focal length.
In some embodiments, the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy: (R1+R2)/(R1-R2) > 10.0. The range is satisfied, and the first lens can control the light direction, increase the depth of field, reduce spherical aberration, correct coma, increase the light utilization rate and improve the stability by adopting the meniscus lens.
In some embodiments, the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: (R3+R4)/(R3-R4) > 5.0. The range is satisfied, the light direction is further controlled, the back focal length is reduced, the imaging quality is improved, and the light utilization rate is increased.
In some embodiments, the sum Σct of the total optical length TTL of the optical lens and the center thicknesses of the first lens to the seventh lens along the optical axis respectively satisfies: 0.6< ΣCT/TTL <1.0. Satisfying the above range can increase the focal length of the optical lens, and can receive a more distant or wider range of scenes.
In some embodiments, the optical total length TTL and the effective focal length f of the optical lens satisfy: TTL/f <2.8. The length of the optical lens can be effectively controlled by meeting the above range, and the miniaturization of the optical lens is facilitated.
In some embodiments, the effective focal length f of the optical lens and the true image height ih corresponding to the maximum field angle FOV and the maximum half field angle satisfy: 1.0< ih/(f×tan (FOV/2)) <1.1. The above range is satisfied, the distortion of the image edge can be reduced, and the overall image quality is improved; the difficulty of later image processing is reduced; the influence of temperature drift is reduced, and the stability and reliability of the optical lens are improved.
In some embodiments, the maximum field angle FOV and aperture value FNO of the optical lens satisfy: 12.0 < FOV/FNO < 20.0. The range is met, the light inlet amount of the optical lens is increased, the imaging quality at night is improved, and noise is reduced; the depth of field is larger, and a long-distance target can be clearly shot.
In some embodiments, the effective focal length f and the optical back focal length BFL of the optical lens satisfy: BFL/f > 0.3. The range is satisfied, the interference of aberration such as aberration, coma and the like can be reduced, and the resolution and definition of imaging are improved; the stability of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: 0< f1/f <6.0. The range is satisfied, so that the first lens has proper positive focal power, the marginal view field light collection capacity is improved, and the working caliber of the first lens is reduced.
In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 0< f2/f <6.0. The range is satisfied, so that the second lens has proper positive focal power, is beneficial to converging light rays, reduces the deflection angle of the light rays, enables the trend of the light rays to be stably transited, and improves the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0< f3/f <2.0. The range is satisfied, so that the third lens has proper positive focal power, is beneficial to converging light rays, reduces the deflection angle of the light rays, enables the trend of the light rays to be stably transited, and improves the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -1.0< f4/f <0. The range is satisfied, so that the fourth lens has proper negative focal power, the spherical aberration generated by the lens at the front end of the optical lens can be 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 f5 of the fifth lens satisfy: 0< f5/f <2.0. The range is satisfied, so that the fifth lens has proper positive focal power, smooth transition of light is facilitated, various aberrations of the optical lens are corrected, and imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 0< f6/f <1.0. The range is satisfied, so that the sixth lens has proper positive focal power, smooth transition of light is facilitated, various aberrations of the optical lens are corrected, and imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f7 of the seventh lens satisfy: -3.0< f7/f <0. The range is satisfied, so that the seventh lens has proper negative focal power, the imaging area of the optical lens is increased, various aberrations of the optical lens are corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the fourth lens and the fifth lens can be glued to form a glued lens, so that chromatic aberration of the optical lens can be effectively corrected, decentered sensitivity of the optical lens can be reduced, aberration of the optical lens can be balanced, and imaging quality of the optical lens can be improved; the assembly sensitivity of the optical lens can be reduced, the processing technology difficulty of the optical lens is further reduced, and the assembly yield of the optical lens is improved.
In order to make the system have better optical performance, an aspherical lens is adopted in the lens, and each aspherical surface shape 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 is the second, fourth, sixth, eighth, tenth and twelfth order surface coefficients respectively.
The invention 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 invention, but the embodiments of the present invention 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 invention are intended to be equivalent substitutes within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens provided in embodiment 1 of the present invention is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: the optical lens assembly includes a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is convex;
the second lens element L2 has positive refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is convex;
a diaphragm ST;
the third lens element L3 has positive refractive power, and both an object-side surface S5 and an image-side surface S6 thereof are convex;
the fourth lens element L4 has negative focal power, and both the object-side surface S7 and the image-side surface S8 thereof are concave surfaces;
the fifth lens element L5 has positive refractive power, wherein an object-side surface S8 thereof is convex, and an image-side surface S9 thereof is concave;
the fourth lens element L4 and the fifth lens element L5 form a cemented lens assembly, i.e., a cemented surface between the image side surface of the fourth lens element L4 and the object side surface of the fifth lens element L5 is S8;
the sixth lens element L6 with positive refractive power has a convex object-side surface S10 and a convex image-side surface S11;
the seventh lens element L7 with negative focal power has a convex object-side surface S12 and a concave image-side surface S13;
the object side surface S14 and the image side surface S15 of the optical filter G1 are planes;
the object side surface S16 and the image side surface S17 of the protective glass G2 are planes;
the imaging surface S18 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 relative illuminance 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, 6, and 7, respectively.
Fig. 2 shows a field curve of example 1, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates 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 0.03mm, which indicates that the optical lens can well 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 imaging plane, the horizontal axis represents the F-Tan θ distortion (unit:%) and the vertical axis represents the half field angle (unit: °). From the figure, the F-Tanθ distortion of the optical lens is controlled within 3%, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 4 shows the relative illuminance curve of example 1, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 5 shows an MTF (modulation transfer function) 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 0.5 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 6 shows an axial aberration diagram of example 1, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within-15 mu m to 10 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 7 shows a vertical axis color difference graph of example 1, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-1 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 2
Referring to fig. 8, a schematic structural diagram of an optical lens provided in embodiment 2 of the present invention is shown, and the optical lens of the present embodiment is substantially the same as embodiment 1, except that: the optical parameters such as the radius of curvature, aspherical surface coefficient, and thickness of each lens surface are different.
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 relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 9, 10, 11, 12, 13, and 14, respectively.
Fig. 9 shows a field curvature curve of example 2, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.1 mm to 0.02mm, which indicates that the optical lens can well correct the field curvature.
Fig. 10 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 imaging plane, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the figure, the F-Tanθ distortion of the optical lens is controlled within 1%, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 11 shows the relative illuminance curve of example 2, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 80% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 12 shows an MTF (modulation transfer function) graph of example 2, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.4 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 13 shows an axial aberration diagram of example 2, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the axial aberration is controlled within ±10μm, which means that the optical lens can correct axial aberration well.
Fig. 14 shows a vertical axis color difference graph of example 2, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within-1 mu m to 2 mu m, which shows that the optical lens can excellently correct chromatic aberration of an edge view field and a secondary spectrum of the whole image surface.
Example 3
Referring to fig. 15, a schematic structural diagram of an optical lens provided in embodiment 3 of the present invention is shown, and the optical lens of the present embodiment is substantially the same as embodiment 1, except that: the optical parameters such as the radius of curvature, aspherical surface coefficient, and thickness of each lens surface are different.
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, the F-Tan θ distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 16, 17, 18, 19, 20, and 21, respectively.
Fig. 16 shows a field curvature curve of example 3, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates 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 +/-0.04 mm, which indicates that the optical lens can well correct the field curvature.
Fig. 17 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 imaging plane, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the figure, the F-Tanθ distortion of the optical lens is controlled within 3%, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 18 shows the relative illuminance curve of example 3, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 19 shows an MTF (modulation transfer function) 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 0.6 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 20 shows an axial aberration diagram of example 3, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-6 mu m to 10 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 21 shows a vertical axis color difference graph of example 3, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-1 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 4
Referring to fig. 22, a schematic structural diagram of an optical lens provided in embodiment 4 of the present invention is shown, and the optical lens of the present embodiment is substantially the same as embodiment 1, except that: the optical parameters such as the radius of curvature, aspherical surface coefficient, and thickness of each lens surface are different.
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 this embodiment, the field curvature curve, the F-Tan θ distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 23, 24, 25, 26, 27, and 28, respectively.
Fig. 23 shows a field curvature curve of example 4, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is shown, the horizontal axis represents the amount of shift (unit: mm), and the vertical axis represents the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.02mm, which indicates that the optical lens can well correct the field curvature.
Fig. 24 shows an F-Tan θ distortion curve of example 4, which represents F-Tan θ distortion of light rays of different wavelengths at different image heights on an imaging plane, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the figure, the F-Tanθ distortion of the optical lens is controlled within 1%, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 25 shows the relative illuminance curve of example 4, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 80% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 26 shows an MTF (modulation transfer function) 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 uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 27 shows an axial aberration diagram of example 4, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within-5 mu m to 15 mu m, which indicates that the optical lens can better correct the axial aberration.
Fig. 28 shows a vertical axis color difference graph of example 4, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-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 5
Referring to fig. 29, a schematic diagram of an optical lens provided in embodiment 5 of the present invention is shown, and the optical lens of the present embodiment is substantially the same as embodiment 1, except that: the optical parameters such as the radius of curvature, aspherical surface coefficient, and thickness of each lens surface are different.
The relevant parameters of each lens in the optical lens in example 5 are shown in table 5-1.
TABLE 5-1
The surface profile parameters of the aspherical lens of the optical lens in example 5 are shown in table 5-2.
TABLE 5-2
In this embodiment, the field curvature curve, the F-Tan θ distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 30, 31, 32, 33, 34, and 35, respectively.
Fig. 30 shows a field curve of example 5, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis shows the amount of shift (unit: mm), and the vertical axis shows 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-0.02 mm to 0.05mm, which indicates that the optical lens can well correct the field curvature.
Fig. 31 shows an F-Tan θ distortion curve of example 5, which represents F-Tan θ distortion of light rays of different wavelengths at different image heights on an imaging plane, the horizontal axis represents F-Tan θ distortion (unit:%) and the vertical axis represents half field angle (unit: °). From the figure, the F-Tanθ distortion of the optical lens is controlled within 3%, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 32 shows the relative illuminance curve of example 5, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 70% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 33 shows an MTF (modulation transfer function) graph of example 5, 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 uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 34 shows an axial aberration diagram of example 5, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the axial aberration is controlled within ±7μm, which means that the optical lens can correct axial aberration well.
Fig. 35 shows a vertical axis color difference graph of example 5, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-1 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Referring to table 6, 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 corresponding to the maximum half field angle, the chief ray incident angle CRA, the maximum field angle FOV and the numerical value corresponding to each condition in each embodiment.
TABLE 6
In summary, according to the optical lens provided by the embodiment of the invention, through reasonable configuration of the surface types of the lenses and reasonable collocation of the focal power, the imaging quality of the optical lens is improved, the aberration is reduced, the imaging quality of the optical lens is improved, and the effects of miniaturization of long focus, high resolution at low cost and use under weak light and severe environments are realized.
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 invention. 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 invention and are described in detail herein without thereby limiting the scope of the invention. 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 invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. An optical lens comprising seven lenses in total, in order from an object side to an imaging surface along an optical axis, comprising:
the first lens with positive focal power has a concave object side surface and a convex image side surface;
a second lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
a fourth lens element having negative optical power, both the object-side and image-side surfaces thereof being concave;
a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
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;
the focal length f1 of the first lens and the focal length f2 of the second lens satisfy: 0.9< f1/f2<1.1.
2. The optical lens of claim 1, wherein the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy: (R1+R2)/(R1-R2) > 10.0.
3. The optical lens of claim 1, wherein the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: (R3+R4)/(R3-R4) > 5.0.
4. 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: 0.6< ΣCT/TTL <1.0.
5. The optical lens of claim 1, wherein the optical total length TTL and the effective focal length f of the optical lens satisfy: TTL/f <2.8.
6. The optical lens according to claim 1, wherein the effective focal length f of the optical lens satisfies a true image height ih corresponding to a maximum field angle FOV and a maximum half field angle: 1.0< ih/(f×tan (FOV/2)) <1.1.
7. The optical lens according to claim 1, wherein the maximum field angle FOV and aperture value FNO of the optical lens satisfy: 12.0 < FOV/FNO < 20.0.
8. The optical lens according to claim 1, wherein an effective focal length f and an optical back focal length BFL of the optical lens satisfy: BFL/f > 0.3.
9. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: 0< f1/f <6.0.
10. The optical lens of claim 1, wherein an effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: 0< f2/f <6.0.
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