CN117148549A - Optical lens - Google Patents
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- CN117148549A CN117148549A CN202311408143.1A CN202311408143A CN117148549A CN 117148549 A CN117148549 A CN 117148549A CN 202311408143 A CN202311408143 A CN 202311408143A CN 117148549 A CN117148549 A CN 117148549A
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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 discloses an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the first lens with positive focal power has a convex object side surface and a concave image side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex; a fourth lens having negative optical power; a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with positive optical power, the image-side surface of which is convex at a paraxial region; a seventh lens element with negative refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region; wherein, the optical lens satisfies the conditional expression: 1.8< TTL/f <2; TTL represents the total optical length of the optical lens and f represents the effective focal length of the optical lens. The optical lens has the advantages of wide angle, small distortion 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, the popularity of smart phones is continuously improved, the smart phone industry is rapidly developing, people increasingly rely on mobile phones to carry out daily activities such as communication, entertainment and work, and in the process of carrying out the daily activities, in order to obtain better use experience, the requirements of people on mobile phone cameras are also increasingly high. Among the various camera types, the ultra-wide angle lens has the advantages of short focal length and large visual angle, can shoot wide scenery in a lower distance range, has more outstanding prospect, has a depth of field range which is obviously larger than that of a standard lens and a telephoto lens, has strong sense of depth of a picture, and is beneficial to enhancing the infectivity of the picture so as to meet the requirement of consumers for shooting in a large visual field.
For a common ultra-wide angle lens, the problems of large distortion, obvious image deformation and stretching and inconsistent proportion exist, and the distortion needs to be corrected by means of a later software algorithm. Therefore, the market demand for ultra-wide angle small distortion lenses is also increasing.
Disclosure of Invention
In view of the above problems, an object of the present application is to provide an optical lens capable of satisfying the requirement of small distortion while obtaining high imaging performance.
The embodiment of the application realizes the aim through the following technical scheme.
The application provides an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: a first lens element with positive refractive power having 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, both the object-side surface and the image-side surface of which are convex; a fourth lens having negative optical power; a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with positive optical power, the image-side surface of which is convex at a paraxial region; a seventh lens element with negative refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region; wherein, the optical lens satisfies the conditional expression: 1.8< TTL/f <2, TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens.
Compared with the prior art, the optical lens provided by the application has the advantages that through reasonable collocation of seven lens surface types and reasonable distribution of focal power, the lens has an ultra-wide shooting range, a compact structure, and meanwhile, the reasonable balance of ultra-wide angle, small distortion and low field curvature of the optical lens can be better realized, the resolution of the optical lens is improved, the aberration and chromatic aberration are reduced, and the imaging quality of the optical lens is improved.
Further, the optical lens satisfies the following conditional expression: 2.7< IH/f <3.2,5.0mm < IH/FNo <5.6mm, wherein IH represents the real image height corresponding to the maximum field angle of the optical lens, f represents the effective focal length of the optical lens, and FNo represents the aperture value of the optical lens.
Further, the optical lens satisfies the following conditional expression: and 0.5< TTL/IH <0.9, wherein TTL represents the total optical length of the optical lens, and IH represents the real image height corresponding to the maximum field angle of the optical lens.
Further, the optical lens satisfies the following conditional expression: 70< f1/f <100, wherein f1 represents a focal length of the first lens and f represents an effective focal length of the optical lens.
Further, the optical lens satisfies the following conditional expression: 0.8< R11/R12<1, wherein R11 represents a radius of curvature of an object side surface of the first lens and R12 represents a radius of curvature of an image side surface of the first lens.
Further, the optical lens satisfies the following conditional expression: -9< f2/f < -6, wherein f2 represents the focal length of the second lens and f represents the effective focal length of the optical lens.
Further, the optical lens satisfies the following conditional expression: -15< f1/f2< -5, wherein f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.
Further, the optical lens satisfies the following conditional expression: -4.5< (f3+f4)/f < -2, wherein f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, and f represents the effective focal length of the optical lens.
Further, the optical lens satisfies the following conditional expression: -8.5< f2/f3< -6.5, wherein f2 represents the focal length of the second lens and f3 represents the focal length of the third lens.
Further, the optical lens satisfies the following conditional expression: -0.7< f6/f7< -0.5, wherein f6 represents the focal length of the sixth lens and f7 represents the focal length of the seventh lens.
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 according to a first embodiment of the present application;
FIG. 2 is a graph showing distortion curves of an optical lens according to a first embodiment of the present application;
FIG. 3 is a graph showing a field curvature of an optical lens according to a first embodiment of the present application;
FIG. 4 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a first embodiment of the present application;
FIG. 5 is a graph showing axial chromatic aberration of an optical lens according to a first embodiment of the present application;
FIG. 6 is a schematic diagram of an optical lens according to a second embodiment of the present application;
FIG. 7 is a graph showing distortion curves of an optical lens according to a second embodiment of the present application;
FIG. 8 is a graph showing a field curvature of an optical lens according to a second embodiment of the present application;
FIG. 9 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a second embodiment of the present application;
FIG. 10 is a graph showing axial chromatic aberration of an optical lens according to a second embodiment of the present application;
FIG. 11 is a schematic diagram of an optical lens according to a third embodiment of the present application;
FIG. 12 is a graph showing distortion curves of an optical lens according to a third embodiment of the present application;
FIG. 13 is a graph showing a field curvature of an optical lens according to a third embodiment of the present application;
FIG. 14 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a third embodiment of the present application;
FIG. 15 is a graph showing axial chromatic aberration of an optical lens according to a third embodiment of the present application;
FIG. 16 is a schematic diagram of an optical lens according to a fourth embodiment of the present application;
FIG. 17 is a graph showing distortion curves of an optical lens according to a fourth embodiment of the present application;
FIG. 18 is a graph showing a field curvature of an optical lens according to a fourth embodiment of the present application;
FIG. 19 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a fourth embodiment of the present application;
fig. 20 is an axial chromatic aberration diagram of an optical lens according to a fourth embodiment of the present application.
Detailed Description
In order that the objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the application are presented in the figures. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all 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. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Like reference numerals refer to like elements throughout the specification.
In this context, near the optical axis means the area near the optical axis. If the lens surface is convex and the convex position is not defined, it means that 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 application provides an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens;
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, both the object-side surface and the image-side surface of which are convex;
a fourth lens having negative optical power;
a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens element with positive optical power, the image-side surface of which is convex at a paraxial region;
the seventh lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
In some embodiments, the optical lens further includes a diaphragm, where the diaphragm is used to limit the amount of light entering, so as to change the brightness of the image, and improve the performance and quality of the optical lens. The diaphragm is located between the second lens and the third lens, so that the functions of the first lens to the seventh lens can be reasonably distributed, for example, the first lens and the second lens are utilized to receive light rays with large angles of view, so that the lens has larger angles of view, and the third lens to the seventh lens are used for correcting aberration, and are beneficial to simplifying the structure of the optical lens so as to improve the imaging quality.
In some embodiments, the optical lens further includes an optical filter, and the optical filter includes an object side surface and an image side surface. The optical filter can be an infrared cut-off filter and is used for filtering interference light and preventing the interference light from reaching the image surface of the optical lens to influence normal imaging.
In some embodiments, the optical lens satisfies the conditional expression: 1.8< TTL/f <2, TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens. The above conditions are satisfied, so that the optical lens has a compact structure, and is beneficial to miniaturization of the optical lens.
In some embodiments, the optical lens satisfies the conditional expression: 2.7< IH/f <3.2,5.0mm < IH/FNo <5.6mm, wherein IH represents the real image height corresponding to the maximum field angle of the optical lens, f represents the effective focal length of the optical lens, and FNo represents the aperture value of the optical lens. The optical lens has the advantages that the balance between the size of the angle of view and the F-Tan (theta) distortion is facilitated, the imaging quality of the optical lens is improved, the lens has a larger image surface and a larger aperture, the luminous flux entering the lens is increased, the influence of noise generated when light is insufficient on an imaging picture is reduced, and the lens still has an excellent imaging effect in a dark night environment, so that the imaging requirement of a bright and dark environment can be met.
In some embodiments, the optical lens satisfies the conditional expression: and 0.5< TTL/IH <0.9, wherein TTL represents the total optical length of the optical lens, and IH represents the real image height corresponding to the maximum field angle of the optical lens. The requirements of high image height and miniaturization of the optical lens can be effectively balanced by meeting the conditions.
In some embodiments, the optical lens satisfies the conditional expression: 70< f1/f <100, wherein f1 represents a focal length of the first lens and f represents an effective focal length of the optical lens. The optical lens meets the above conditions, and is beneficial to correcting the axial chromatic aberration of the optical lens and improving the imaging quality of the optical lens by setting the reasonable focal power ratio of the first lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.07< CT1/TTL <0.10, wherein CT1 represents the center thickness of the first lens, and TTL represents the total optical length of the optical lens. The axial chromatic aberration of the optical lens is corrected and the imaging quality of the optical lens is improved by setting the reasonable central thickness ratio of the first lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.8< R11/R12<1, R11 represents a radius of curvature of an object side surface of the first lens, and R12 represents a radius of curvature of an image side surface of the first lens. The first lens has proper surface shape, which is beneficial to enlarging the field angle of the lens, reducing the aberration of the lens and realizing the wide angle of the lens.
In some embodiments, the optical lens satisfies the conditional expression: -9< f2/f < -6, wherein f2 represents the focal length of the second lens. The spherical aberration generated by the second lens can be effectively corrected by setting the reasonable focal power ratio of the second lens, and the overall imaging quality is improved.
In some embodiments, the optical lens satisfies the conditional expression: 0.02< CT2/TTL <0.04, wherein CT2 represents the center thickness of the second lens on the optical axis, and TTL represents the total optical length of the optical lens. And the spherical aberration generated by the second lens can be effectively corrected by setting the reasonable central thickness ratio of the second lens, so that the overall imaging quality is improved.
In some embodiments, the optical lens satisfies the conditional expression: -15< f1/f2< -5, wherein f1 represents the focal length of the first lens and f2 represents the focal length of the second lens. The focal length ratio of the first lens and the second lens can be reasonably distributed, the imaging quality of the optical lens is improved, and the vertical axis chromatic aberration of the optical lens is corrected.
In some embodiments, the optical lens satisfies the conditional expression: -4.5< (f3+f4)/f < -2, wherein f3 represents the focal length of the third lens and f4 represents the focal length of the fourth lens. The focal length ratio of the third lens and the fourth lens is reasonably matched, so that the convergence of vertical axis chromatic aberration is facilitated, and the resolution is improved.
In some embodiments, the optical lens satisfies the conditional expression: -8.5< f2/f3< -6.5, wherein f2 represents the focal length of the second lens and f3 represents the focal length of the third lens. The focal length ratio of the second lens and the third lens is reasonably distributed, so that the overlarge deflection degree of light rays passing through the optical lens can be avoided, the aberration correction difficulty is reduced, and the high-pixel imaging of the optical lens is realized.
In some embodiments, the optical lens satisfies the conditional expression: -0.7< f6/f7< -0.5, wherein f6 represents the focal length of the sixth lens and f7 represents the focal length of the seventh lens. The focal length ratio of the sixth lens and the seventh lens is reasonably set to meet the conditions, so that the on-axis aberration can be effectively reduced, and the imaging quality can be improved.
In some embodiments, the optical lens satisfies the conditional expression: 1.5< R71/R72<2.5, wherein R71 represents a radius of curvature of an object side surface of the seventh lens, and R72 represents a radius of curvature of an image side surface of the seventh lens. The above conditions are satisfied, and the shape of the seventh lens is reasonably adjusted, so that the distortion and the curvature of field of a large angle can be effectively converged, and the imaging quality is improved.
In some embodiments, the optical lens satisfies the conditional expression: 0.1< (CT5+CT6)/TTL <0.2, wherein CT5 represents the center thickness of the fifth lens, CT6 represents the center thickness of the sixth lens, and TTL represents the total optical length of the optical lens. The total length of the optical lens can be effectively controlled by controlling the thickness ratio of the fifth lens and the sixth lens, thereby being beneficial to miniaturization of the lens.
In some embodiments, the optical lens satisfies the conditional expression: 0.5< (ct1+ct2+ct3)/(ct5+ct6+ct7) <1, wherein CT1 represents a center thickness of the first lens, CT2 represents a center thickness of the second lens, CT3 represents a center thickness of the third lens, CT5 represents a center thickness of the fifth lens, CT6 represents a center thickness of the sixth lens, and CT7 represents a center thickness of the seventh lens. Through the reasonable central thickness of collocation front three lenses and back three lenses, when correcting the distortion of optical lens, be favorable to reducing the sensitivity of optical lens, improve the yield.
In some embodiments, the optical lens satisfies the conditional expression: 2< CT1/CT2<3, wherein CT1 represents the center thickness of the first lens and CT2 represents the center thickness of the second lens. The thickness of the first lens and the thickness of the second lens are reasonably set, so that light distribution can be regulated, transition of light passing through the lens is gentle, control of lens distortion is facilitated, and the lens has a wide viewing angle and small distortion.
As an implementation mode, the application adopts seven plastic lens combinations, and the optical lens has the advantages of at least good imaging quality, ultra-wide angle, large optical image surface, low sensitivity and miniaturization by reasonably distributing the focal power of each lens and optimizing the aspheric surface shape. Specifically, the first lens to the seventh lens can all adopt plastic aspheric lenses, and the aspheric lenses can effectively correct aberration, improve imaging quality and provide optical performance products with higher cost performance. Preferably, the application can also select a plurality of lenses mixed and matched by glass and plastic, and can obtain proper imaging effect. Specifically, the first lens has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface, so that light rays with a larger included angle with an optical axis can be conveniently converged, large-angle light ray beam convergence is realized, the total optical length of the optical lens can be shortened, and the purpose of miniaturization is realized; the second lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface, so that the phenomenon that light deflection is overlarge due to overlarge focal power of the first lens is avoided, and the difficulty of chromatic aberration correction of the optical lens is reduced; the third lens has positive focal power, the object side surface and the image side surface of the third lens are convex, and the deflection angle of light rays can be reduced while the light rays are converged, so that the overall trend of the light rays is stable; the fourth lens has negative focal power, so that the imaging area can be increased, and the imaging quality is improved; the fifth lens has negative focal power, 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 the imaging area can be increased, and the imaging quality can be improved; the sixth lens has positive focal power, the image side surface of the sixth lens is convex at a paraxial region, so that lens aberration can be balanced, and imaging quality is improved; the seventh lens has negative focal power, the object side surface of the seventh lens is convex at a paraxial region, and the image side surface of the seventh lens is concave at a paraxial region, so that lens aberration can be balanced, and imaging quality is improved.
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.
In various embodiments of the present application, when an aspherical lens is used as the lens, the surface shape of the aspherical lens satisfies the following equation:
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h along the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient conic, A 2i The aspherical surface profile coefficient of the 2 i-th order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S17 along an optical axis: 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, and a filter G1.
The first lens element L1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave.
The second lens element L2 has negative refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave.
The third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex, and an image-side surface S6 of the third lens element is convex.
The fourth lens element L4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex at a paraxial region thereof and an image-side surface S8 of the fourth lens element is concave at a paraxial region thereof.
The fifth lens element L5 has negative refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex.
The sixth lens element L6 has positive refractive power, wherein an object-side surface S11 of the sixth lens element is concave, and an image-side surface S12 of the sixth lens element is convex at a paraxial region.
The seventh lens L7 has negative optical power, an object-side surface S13 of the seventh lens is convex at a paraxial region, and an image-side surface S14 of the seventh lens is concave at a paraxial region.
The object side surface of the filter G1 is S15, and the image side surface is S16.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspheric lenses.
Specifically, the design parameters of each lens of the optical lens 100 provided in the present embodiment are shown in table 1.
TABLE 1
The surface profile coefficients of the aspherical surfaces of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
In the present embodiment, graphs of distortion, curvature of field, chromatic aberration of homeotropic axis, and chromatic aberration of axial direction of the optical lens 100 are shown in fig. 2, 3, 4, and 5, respectively.
The distortion curves in FIG. 2 represent F-Tan (θ) distortions corresponding to different fields of view on the image plane, with the abscissa representing the magnitude of the distortion (in:%), and the ordinate representing the angle of view (in degrees); as can be seen from the figure, the distortion of the lens is controlled to be within ±2% in the full field of view of the lens, indicating that the distortion of the optical lens 100 is well corrected.
In fig. 3, the field Qu Quxian represents the field curvature of the meridian and sagittal directions at different image heights on the image plane, the abscissa represents the offset (unit: mm), and the ordinate represents the angle of view (unit: degree), and as can be seen from the figure, the field curvature offset of the meridian and sagittal directions on the image plane is controlled within ±0.1mm, which indicates that the field curvature of the optical lens 100 is well corrected.
The vertical axis chromatic aberration curves in fig. 4 show chromatic aberration of different image heights of each wavelength with respect to the center wavelength on the image plane, the horizontal axis in the figure shows the vertical axis chromatic aberration value (unit: micrometers) of each wavelength with respect to the center wavelength, and the vertical axis shows the normalized angle of view (unit: degrees), and it is known that the chromatic aberration of each wavelength with respect to the center wavelength is controlled within ±2 micrometers in different fields of view, which means that the vertical axis chromatic aberration of the optical lens 100 is well corrected.
The axial chromatic aberration curve in fig. 5 shows the aberration on the optical axis at the imaging plane, the abscissa in the figure shows the offset (unit: mm), and the ordinate shows the normalized pupil radius, and it is known from the figure that the axial chromatic aberration of the shortest wavelength and the maximum wavelength is controlled within ±0.03 mm, and when the ordinate is zero, the difference between the shortest wavelength and the maximum wavelength is controlled within 0.04 mm, indicating that the axial chromatic aberration of the optical lens 100 is well corrected.
Second embodiment
Referring to fig. 6, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present application is shown, and the optical lens 200 according to the present embodiment is substantially the same as the optical lens 100 according to the first embodiment, and is mainly characterized in that an object-side surface S7 of the fourth lens element is concave, and curvature radius, aspheric coefficients, thickness and material of each lens element are different.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3 Table 3
The surface profile coefficients of the aspherical surfaces of the optical lens 200 in this embodiment are shown in table 4.
TABLE 4 Table 4
Referring to fig. 7, 8, 9 and 10, there are shown graphs of distortion, curvature of field, chromatic aberration of vertical axis and chromatic aberration of axial direction of the optical lens 200, respectively, and it can be seen from fig. 7 that the optical distortion is controlled within ±2%, which indicates that the distortion of the optical lens 200 is well corrected; as can be seen from fig. 8, the curvature of field is controlled within ±0.1mm, which indicates that the curvature of field of the optical lens 200 is better corrected; it can be seen from fig. 9 that the vertical chromatic aberration at different wavelengths is controlled within ±2 micrometers, and that the axial chromatic aberration at different wavelengths is controlled within ±0.03 millimeters, and that the difference between the shortest wavelength and the maximum wavelength is controlled within 0.03 millimeters when the ordinate is zero, which means that the chromatic aberration of the optical lens 200 is well corrected; as can be seen from fig. 7, 8, 9 and 10, the optical lens 200 has good optical imaging quality.
Third embodiment
As shown in fig. 11, a schematic structural diagram of an optical lens 300 according to the present embodiment is provided, and the optical lens 300 according to the present embodiment is substantially the same as the optical lens 200 according to the second embodiment described above, except that the radius of curvature, aspheric coefficients, thickness, and materials of the lens surfaces are different.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
The surface profile coefficients of the aspherical surfaces of the optical lens 300 in this embodiment are shown in table 6.
TABLE 6
Referring to fig. 12, 13, 14 and 15, the distortion, curvature of field, chromatic aberration of vertical axis and chromatic aberration of axial direction of the optical lens 300 are shown respectively, and it can be seen from fig. 12 that the optical distortion is controlled within ±2%, which indicates that the distortion of the optical lens 300 is well corrected; from fig. 13, it can be seen that the curvature of field is controlled within ±0.2mm, which indicates that the curvature of field of the optical lens 300 is better corrected; it can be seen from fig. 14 that the vertical chromatic aberration at different wavelengths is controlled within ±3.5 micrometers, and that the axial chromatic aberration at different wavelengths is controlled within ±0.03 millimeters, and that the difference between the shortest wavelength and the maximum wavelength is controlled within 0.04 millimeters when the ordinate is zero, which means that the chromatic aberration of the optical lens 300 is well corrected; as can be seen from fig. 12, 13, 14 and 15, the optical lens 300 has good optical imaging quality.
Fourth embodiment
Referring to fig. 16, a schematic diagram of an optical lens 400 according to a fourth embodiment of the present application is shown, and the optical lens 400 has substantially the same structure as the optical lens 100 of the first embodiment, except that an object-side surface S11 of the sixth lens element is convex at a paraxial region, and curvature radii, aspheric coefficients, thicknesses, and materials of lens surfaces are different.
The relevant parameters of each lens in the optical lens 400 provided in this embodiment are shown in table 7.
TABLE 7
The surface profile coefficients of the aspherical surfaces of the optical lens 400 in this embodiment are shown in table 8.
TABLE 8
Referring to fig. 17, 18, 19 and 20, there are shown graphs of distortion, curvature of field, chromatic aberration of vertical axis and chromatic aberration of axial direction of the optical lens 400, respectively, and it can be seen from fig. 17 that the optical distortion is controlled within ±2%, which indicates that the distortion of the optical lens 400 is well corrected; as can be seen from fig. 18, the curvature of field is controlled within ±0.2mm, which indicates that the curvature of field of the optical lens 400 is better corrected; it can be seen from fig. 19 that the vertical chromatic aberration at different wavelengths is controlled within ±2 micrometers, and from fig. 20 that the axial chromatic aberration at different wavelengths is controlled within ±0.03 millimeters, and that the difference between the shortest wavelength and the maximum wavelength is controlled within 0.04 millimeters when the ordinate is zero, indicates that the chromatic aberration of the optical lens 400 is well corrected; as can be seen from fig. 17, 18, 19 and 20, the optical lens 400 has good optical imaging quality.
Referring to table 9, the optical characteristics of the optical lens provided in the above four embodiments, including the effective focal length f, the total optical length TTL, the maximum field angle FOV, the image height IH corresponding to the maximum field angle, and the correlation values corresponding to each of the foregoing conditional expressions, are shown.
TABLE 9
In summary, the optical lens provided in the present embodiment has at least the following advantages:
(1) The optical lens provided by the application can better realize the reasonable equalization of ultra wide angle, small distortion and low field curvature of the optical lens through the reasonable collocation of the lens surface types and the reasonable distribution of the focal power, thereby improving the resolution of the optical lens, reducing the aberration and the chromatic aberration and improving the imaging quality of the optical lens.
(2) The optical lens provided by the application adopts seven lenses with specific focal power, so that the lens has an ultra-large imaging angle and a compact structure.
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 above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present 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 the application should be assessed as that of the appended claims.
Claims (10)
1. An optical lens comprising, in order from an object side to an imaging surface along an optical axis:
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a third lens having positive optical power, both the object-side surface and the image-side surface of which are convex;
a fourth lens having negative optical power;
a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens element with positive optical power, the image-side surface of which is convex at a paraxial region;
a seventh lens element with negative refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region;
wherein, the optical lens satisfies the conditional expression: 1.8< TTL/f <2, TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 2.7< IH/f <3.2,5.0mm < IH/FNo <5.6mm, wherein IH represents the real image height corresponding to the maximum field angle of the optical lens, f represents the effective focal length of the optical lens, and FNo represents the aperture value of the optical lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: and 0.5< TTL/IH <0.9, wherein TTL represents the total optical length of the optical lens, and IH represents the real image height corresponding to the maximum field angle of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 70< f1/f <100, wherein f1 represents a focal length of the first lens and f represents an effective focal length of the optical lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.8< R11/R12<1, wherein R11 represents a radius of curvature of an object side surface of the first lens and R12 represents a radius of curvature of an image side surface of the first lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -9< f2/f < -6, wherein f2 represents the focal length of the second lens and f represents the effective focal length of the optical lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -15< f1/f2< -5, wherein f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -4.5< (f3+f4)/f < -2, wherein f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, and f represents the effective focal length of the optical lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -8.5< f2/f3< -6.5, wherein f2 represents the focal length of the second lens and f3 represents the focal length of the third lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -0.7< f6/f7< -0.5, wherein f6 represents the focal length of the sixth lens and f7 represents the focal length of the seventh lens.
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