CN115291370B - Optical lens - Google Patents
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- CN115291370B CN115291370B CN202211186646.4A CN202211186646A CN115291370B CN 115291370 B CN115291370 B CN 115291370B CN 202211186646 A CN202211186646 A CN 202211186646A CN 115291370 B CN115291370 B CN 115291370B
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
Abstract
The invention provides an optical lens, which comprises seven lenses in total, wherein the seven lenses are sequentially arranged from an object side to an imaging surface along an optical axis as follows: a first lens having a negative optical power; a second lens having a positive optical power; a diaphragm; a third lens having a positive optical power; a fourth lens having a positive optical power; a fifth lens having a negative optical power; a sixth lens having positive optical power; a seventh lens having a negative optical power; maximum field angle FOV of optical lens, real image height IH corresponding to the maximum field angle and object side effective working caliber D of first lens 1 Satisfies the following conditions: d is more than 0.6 1 IH/tan (FOV/2) < 0.8. The optical lens has the advantages of large field angle, large aperture, high definition and imaging quality.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the rapid development of Advanced Driving Assistance Systems (ADAS), the vehicle-mounted lens has wider application and development. The method comprises a vehicle data recorder, automatic parking, front vehicle collision early warning (FCW), lane departure early warning (LDW), pedestrian detection early warning (PCW) and the like. Although the conventional wide-angle vehicle-mounted lens can basically meet the basic requirements of the use of a large-field vehicle-mounted lens, a plurality of defects still exist, such as too small field angle or aperture, insufficient resolution and the like.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an optical lens having advantages of a large field angle, a large aperture, high definition and high imaging quality.
In order to realize the purpose, the technical scheme of the invention is as follows:
an optical lens comprises seven lenses, in order from an object side to an image plane along an optical axis:
a first lens having a negative refractive power, an image-side surface of which is concave;
the second lens with positive focal power has a concave object-side surface and a convex image-side surface;
a diaphragm;
a third lens with positive focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex;
a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave;
a sixth lens element having a positive refractive power, the object-side surface and the image-side surface of the sixth lens element being convex;
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the maximum field angle FOV of the optical lens, the real image height IH corresponding to the maximum field angle and the object side surface effective working caliber D of the first lens 1 Satisfies the following conditions: d is more than 0.6 1 /IH/tan(FOV/2)＜0.8。
Preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is more than 4.2 and less than 5.0.
Preferably, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: IH/f is more than 1.6 and less than 1.9.
Preferably, the optical back focus BFL and the effective focal length f of the optical lens satisfy: BFL/f is more than 0.6 and less than 0.9.
Preferably, the entrance pupil diameter EPD of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: IH/EPD is more than 2.5 and less than 3.0.
Preferably, the effective focal length f of the optical lens and the focal length f of the seventh lens element 7 Satisfies the following conditions: -35.0 < f 7 /f＜-10.0。
Preferably, the object side curvature radius R of the second lens 3 Radius of curvature R of image side 4 Satisfies the following conditions: 1.5 < R 3 /R 4 Less than 2.5; focal length f of the second lens 2 And center thickness CT 2 Satisfies the following conditions: f is more than 5.0 2 /CT 2 ＜13.0。
Preferably, the fifth lens has an object-side radius of curvature R 9 And the image side surface curvature radius R of the sixth lens 12 Satisfies the following conditions: r is more than 1.4 9 /R 12 ＜2.0。
Preferably, an image side vector of the seventh lensHigh Sag 14 And light passing semi-aperture d 14 Satisfies the following conditions: sag of 0 14 /d 14 ＜0.3。
Preferably, the total optical length TTL of the optical lens and the sum Σ CT of the central thicknesses of the first lens element to the seventh lens element along the optical axis satisfy: 0.6 < ∑ CT/TTL.
Compared with the prior art, the invention has the beneficial effects that: the optical lens disclosed by the application has the advantages of simultaneously having large field angle, large aperture, high definition and high imaging quality by reasonably matching the lens shapes and focal power combinations among the lenses.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention;
fig. 2 is a field curvature graph of the optical lens in embodiment 1 of the present invention;
FIG. 3 is a graph showing F-tan θ distortion of an optical lens in example 1 of the present invention;
fig. 4 is a graph showing a relative illumination of an optical lens in embodiment 1 of the present invention;
fig. 5 is a MTF graph of the optical lens in embodiment 1 of the present invention;
fig. 6 is a graph showing axial aberration of the optical lens in embodiment 1 of the present invention;
FIG. 7 is a vertical axis chromatic aberration diagram of an optical lens in embodiment 1 of the present invention;
fig. 8 is a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention;
FIG. 9 is a graph of curvature of field of an optical lens in embodiment 2 of the present invention;
FIG. 10 is a graph showing F-tan θ distortion of an optical lens in example 2 of the present invention;
fig. 11 is a graph showing a relative illuminance of an optical lens in embodiment 2 of the present invention;
fig. 12 is a MTF graph of an optical lens in embodiment 2 of the present invention;
fig. 13 is a graph showing axial aberration of the optical lens in embodiment 2 of the present invention;
FIG. 14 is a vertical axis chromatic aberration diagram of an optical lens in embodiment 2 of the present invention;
fig. 15 is a schematic structural diagram of an optical lens system according to embodiment 3 of the present invention;
FIG. 16 is a graph of curvature of field of an optical lens in embodiment 3 of the present invention;
FIG. 17 is a graph showing F-tan θ distortion of an optical lens in embodiment 3 of the present invention;
fig. 18 is a graph showing a relative illuminance curve of the optical lens in embodiment 3 of the present invention;
fig. 19 is a MTF graph of an optical lens in embodiment 3 of the present invention;
FIG. 20 is a graph showing axial aberrations of an optical lens according to embodiment 3 of the present invention;
FIG. 21 is a vertical axis chromatic aberration diagram of an optical lens in embodiment 3 of the present invention;
fig. 22 is a schematic structural diagram of an optical lens system according to embodiment 4 of the present invention;
FIG. 23 is a graph of curvature of field of an optical lens in embodiment 4 of the present invention;
FIG. 24 is a graph showing F-tan θ distortion of an optical lens in embodiment 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 a MTF graph of the optical lens in embodiment 4 of the present invention;
fig. 27 is a graph showing axial aberration of the optical lens in embodiment 4 of the present invention;
fig. 28 is a vertical axis chromatic aberration diagram of the optical lens in embodiment 4 of the present invention.
The following detailed description will further illustrate the invention 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 the detailed description is merely illustrative of embodiments of the application and does not limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, 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 surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after the list of listed features, that the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the application. Also, the term "exemplary" is intended to refer to examples or illustrations.
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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The optical lens according to the embodiment of the present invention includes, in order from an object side to an image side: the lens comprises a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.
In some embodiments, the first lens may have a negative power, which is beneficial for reducing the inclination angle of the incident light, thereby achieving effective sharing of a large field of view of the object. The image side surface of the first lens is a concave surface, so that the effective working aperture of the first lens can be reduced, and the aperture of the lens behind the optical lens is prevented from being too large due to excessive divergence of light.
In some embodiments, the second lens may have a positive focal power, which is beneficial to reduce the working aperture of the optical lens while converging light rays, thereby being beneficial to miniaturization of the optical lens. The object side surface of the second lens is a concave surface, the image side surface of the second lens is a convex surface, and the light rays of the marginal field of view can be converged, so that the converged light rays smoothly enter the rear-end optical system, and the imaging quality of the optical lens is improved.
In some embodiments, the third lens element may have a positive refractive power, which is beneficial to increase an imaging area of the optical lens and improve an imaging quality of the optical lens. The object side surface of the third lens is a concave surface, the image side surface of the third lens is a convex surface, and therefore light rays in an edge field of view can be converged, the converged light rays can stably enter a rear-end optical system, the deflection angle of the light rays can be reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the fourth lens element may have a positive focal power, which is beneficial for converging light rays and reducing the deflection angle of the light rays, so that the light rays are in smooth transition. The object side surface and the image side surface of the fourth lens are convex surfaces, so that the influence of the self coma aberration of the fourth lens on the optical lens is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the fifth lens element may have a negative focal power, which is beneficial to increase an imaging area of the optical lens and improve the imaging quality of the optical lens. The object side surface and the image side surface of the fifth lens are both concave surfaces, and light rays with marginal view fields can be converged, so that the converged light rays can smoothly enter a rear-end optical system, and the imaging quality of the optical lens is improved.
In some embodiments, the sixth lens may have a positive optical power, and spherical aberration and chromatic aberration of the optical lens can be corrected by cooperating with the fifth lens. The object side surface and the image side surface of the sixth lens are convex surfaces, so that the influence of the self coma aberration of the sixth lens on the optical lens is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the seventh lens element may have a negative refractive power, which is beneficial to increase an imaging area of the optical lens and improve the imaging quality of the optical lens. The object side surface of the seventh lens is a convex surface, the image side surface of the seventh lens is a concave surface, and the rays of the central field of view can be further converged, so that the total length of the optical lens is compressed; meanwhile, the influence of the self curvature of field of the seventh lens on the optical lens can be reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the fifth lens and the sixth lens can be cemented to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce decentration sensitivity of the optical lens, balance aberration of the optical lens, and improve imaging quality of the optical lens; the assembly sensitivity of the optical lens can be reduced, the processing difficulty of the optical lens is further reduced, and the assembly yield of the optical lens is improved.
In some embodiments, a diaphragm for limiting the light beam may be disposed between the second lens and the third lens, and the diaphragm may be disposed near an object-side surface of the third lens, so as to reduce generation of ghost of the optical lens, and to facilitate converging light entering the optical system and reduce a rear aperture of the optical lens.
In some embodiments, the aperture value FNO of the optical lens satisfies: FNO is less than or equal to 1.6. The range is satisfied, the large aperture characteristic is favorably realized, and the image definition can be ensured in a low-light environment or at night.
In some embodiments, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is more than 4.2 and less than 5.0. The optical lens can effectively limit the length of the lens and is beneficial to realizing the miniaturization of the optical lens.
In some embodiments, the real image height IH corresponding to the maximum field angle and the effective focal length f of the optical lens satisfy: IH/f is more than 1.6 and less than 1.9. Satisfying the above range can make the optical lens not only give consideration to the characteristics of a large image plane, but also have good imaging quality.
In some embodiments, the optical back focus BFL of the optical lens and the effective focal length f satisfy: BFL/f is more than 0.6 and less than 0.9. The method meets the range, is favorable for obtaining balance between good imaging quality and optical back focal length easy to assemble, and reduces the difficulty of the camera module assembly process while ensuring the imaging quality of the optical lens.
In some embodiments, the entrance pupil diameter EPD of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: IH/EPD is more than 2.5 and less than 3.0. The width of the light ray bundle entering the optical lens can be increased, so that the brightness of the optical lens at the image surface is improved, and the dark corner is avoided.
In some embodiments, the maximum field angle FOV of the optical lens, the true image height IH corresponding to the maximum field angle, and the object side effective working aperture D of the first lens 1 Satisfies the following conditions: d is more than 0.6 1 the/IH/tan (FOV/2) < 0.8. The optical lens has the advantages that the optical lens has a large field angle and a large image plane, the front port diameter is small, and the miniaturization of the optical lens is facilitated.
In some embodiments, the effective focal length f, the maximum field angle FOV, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.6 < (IH/2)/(fXtan (FOV/2)) < 0.7. Satisfying the above range indicates that the optical distortion of the optical lens is excellently controlled, and the resolving power of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the first lens are different 1 Satisfies the following conditions: -1.2 < f 1 The/f is less than 0. Satisfying the above range, the first lens can have a proper negative focal power, and the object-side light can be prevented from being too much diffused, which is beneficial to controlling the aperture of the rear lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens 2 Satisfies the following conditions: f is more than 0 2 The/f is less than 3.0. The second lens has appropriate positive focal power, so that the working aperture of the optical lens is reduced by converging light rays, various aberrations of the optical lens are balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the third lens are 3 Satisfies the following conditions: f is more than 0 3 The/f is less than 3.0. Satisfy above-mentioned scope, can make the third lens have appropriate positive focal power, be favorable to the smooth transition of light, correct optical lens's spherical aberration, coma and field curvature simultaneously, promote optical lens's imaging quality.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fourth lens are 4 Satisfies the following conditions: f is more than 0 4 The/f is less than 3.5. Satisfying above-mentioned scope, can making the fourth lens have appropriate positive focal power, be favorable to the smooth transition of light, correct all kinds of aberrations of optical lens simultaneously, promote optical lens's image quality.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 Satisfies the following conditions: -1.5 < f 5 The/f is less than 0. Satisfy above-mentioned scope, can make the fifth lens have appropriate negative power, be favorable to increasing optical lens's image area, correct optical lens's spherical aberration and coma simultaneously, promote optical lens's image quality.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the sixth lens element 6 Satisfies the following conditions: f is more than 0 6 The/f is less than 1.5. The sixth lens element has appropriate positive focal power, so that light can be smoothly transited, various aberrations of the optical lens element can be corrected, and the imaging quality of the optical lens element can be improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the seventh lens 7 Satisfies the following conditions: -35.0 < f 7 And/f < -10.0. Satisfy above-mentioned scope, can make the seventh lens have appropriate negative power, be favorable to increasing optical lens's imaging area, correct optical lens's coma, astigmatism and field curvature simultaneously, promote optical lens's imaging quality.
In some embodiments, the effective focal length f of the optical lens and the combined focal length f of the first and second lenses 12 Satisfies the following conditions: -5.0 < f 12 And/f is less than-2.2. Satisfy above-mentioned scope, through the focus of rational distribution first lens and second lens, be favorable to balancing all kinds of aberrations, promote optical lens's imaging quality.
In some embodiments, the radius of curvature of the object-side surface of the second lens, R 3 Radius of curvature R of image-side surface 4 Satisfies the following conditions: 1.5 < R 3 /R 4 Is less than 2.5; focal length f of the second lens 2 And center thickness CT 2 Satisfies the following conditions: f is more than 5.0 2 /CT 2 Is less than 13.0. Satisfy above-mentioned scope, adopt thicker meniscus lens not only can correct optical lens's field curvature, but also can assemble marginal visual field light, ensure that optical lens has great relative illuminance, promote optical lens's imaging quality.
In some embodiments, the fifth lens has a radius of curvature of the object side R 9 And the image side surface curvature radius R of the sixth lens 12 Satisfies the following conditions: r is more than 1.4 9 /R 12 Is less than 2.0. The optical lens assembly meets the above range, can enable the object side surface of the fifth lens element and the image side surface of the sixth lens element to obtain similar surface types, is beneficial to reducing and balancing the field curvature of the fifth lens element and the sixth lens element, and improves the imaging quality of the optical lens assembly.
In some embodiments, the sagittal height Sag of the image-side surface of the seventh lens 14 And light passing half aperture d 14 Satisfies the following conditions: sag 0 14 /d 14 ＜0.3。Satisfy above-mentioned scope, can effectively retrain the face type of seventh lens image side off-axis visual field, guarantee that marginal visual field light has sufficient deflection angle when passing through seventh lens, guarantee that the angle of incidence angle when light incides to the image forming surface is less to ensure that optical lens has great relative illuminance, promote optical lens's imaging quality.
In some embodiments, the total optical length TTL of the optical lens and the sum Σ CT of the central thicknesses of the first lens to the seventh lens along the optical axis, respectively, satisfy: 0.6 < ∑ CT/TTL. The optical lens structure meets the range, can effectively compress the total length of the optical lens, and is beneficial to the structural design and the production process of the optical lens.
In order to make the system have better optical performance, a plurality of aspheric lenses are adopted in the lens, and the surface shapes of the aspheric surfaces of the optical lens satisfy the following equation:
wherein z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance between the optical axis and the curved surface, C is the curvature of the vertex of the curved surface, K is a quadric coefficient, and A, B, C, D, E and F are second-order, fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order curved coefficients respectively.
The invention is further illustrated below by means of a number of examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a diaphragm 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 L1 has negative focal power, the object side surface S1 of the first lens is a plane, and the image side surface S2 of the first lens is a concave surface;
the second lens L2 has positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface;
the fourth lens L4 has positive focal power, and both the object side surface S7 and the image side surface S8 are convex surfaces;
the fifth lens L5 has negative focal power, and both the object side surface S9 and the image side surface S10 are concave surfaces;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 can be glued to form a cemented lens;
the object side surface S15 and the image side surface S16 of the optical filter G1 are both planes;
the object side surface S17 and the image side surface S18 of the protective glass G2 are both planes;
the image formation surface S19 is a plane.
The relevant parameters of each lens in the optical lens in example 1 are shown in table 1-1.
TABLE 1-1
The surface shape parameters of the aspherical lens of the optical lens in example 1 are shown in table 1-2.
Tables 1 to 2
In this embodiment, the curvature of field curve, F-tan θ distortion, relative illumination, MTF, axial aberration, and homeotropic aberration of the optical lens are shown in fig. 2, 3, 4, 5, 6, and 7, respectively.
Fig. 2 shows a field curvature curve of example 1, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, with the horizontal axis representing the amount of displacement (unit: mm) and the vertical axis representing the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.06mm, which indicates that the optical lens can correct the field curvature well.
Fig. 3 shows an F-tan θ distortion curve of example 1, which shows F-tan θ distortions at different image heights on an image forming plane for light rays of different wavelengths, with the abscissa representing the F-tan θ distortion (unit:%) and the ordinate representing the half field angle (unit: °). As can be seen from the figure, the F-tan theta distortion of the optical lens is controlled within +/-40%, the trend of the F-tan theta distortion curve is smooth, the image compression of the edge large-angle area is smooth, the definition of the expanded image is effectively improved, and the optical lens can better correct the F-tan theta distortion.
Fig. 4 shows a relative illuminance curve of example 1, which represents relative illuminance values at different angles of field of view on the imaging plane, with the horizontal axis representing the half field angle (unit: °) and the vertical axis representing the relative illuminance (unit:%). As can be seen from the figure, the relative luminance value of the optical lens is still greater than 80% at the maximum half field angle, indicating that the optical lens has excellent relative luminance.
Fig. 5 shows MTF (modulation transfer function) graphs of embodiment 1, which represent the degree of modulation of lens imaging at different spatial frequencies for each field of view, with the horizontal axis representing the spatial frequency (unit: lp/mm) and the vertical axis representing the MTF value. As can be seen from the figure, the MTF value of the embodiment is 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 from the center to the edge field of view, and the image quality and the detail resolution capability are good under the conditions of low frequency and high frequency.
Fig. 6 shows an axial aberration curve of example 1, which represents the aberration on the optical axis at the imaging plane for each wavelength, with the horizontal axis representing the axial aberration value (unit: μm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ± 30 μm, which indicates that the optical lens can correct the axial aberration well.
Fig. 7 shows a vertical axis chromatic aberration curve of example 1, which shows chromatic aberration at different image heights on an image forming plane for each wavelength with respect to a center wavelength (0.55 μm), the horizontal axis shows a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows a normalized angle of view. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-2 μm, which shows that the optical lens can effectively correct the chromatic aberration of the fringe field and the secondary spectrum of the whole image plane.
Example 2
Referring to fig. 8, a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane 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, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, the object side surface S1 of the first lens is a plane, and the image side surface S2 of the first lens is a concave surface;
the second lens L2 has positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object-side surface S5 is a concave surface, and the image-side surface S6 is a convex surface;
the fourth lens L4 has positive focal power, and both the object side surface S7 and the image side surface S8 are convex surfaces;
the fifth lens L5 has negative focal power, and both the object-side surface S9 and the image-side surface S10 are concave;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has a negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
The relevant parameters of each lens in the optical lens in embodiment 2 are shown in table 2-1.
TABLE 2-1
The surface shape parameters of the aspherical lens of the optical lens in example 2 are shown in table 2-2.
Tables 2 to 2
In the present embodiment, a field curvature graph, an F-tan θ distortion curve, a relative illumination graph, an MTF graph, an axial aberration graph, and a vertical axis chromatic aberration graph of the optical lens are respectively shown in fig. 9, fig. 10, fig. 11, fig. 12, fig. 13, and fig. 14.
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, with the horizontal axis indicating the amount of displacement (unit: mm) and the vertical axis indicating the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.10mm, which indicates that the optical lens can correct the field curvature well.
Fig. 10 shows an F-tan θ distortion curve of example 2, which shows F-tan θ distortions at different image heights on an image forming plane for light rays of different wavelengths, with the abscissa representing the F-tan θ distortion (unit:%) and the ordinate representing the half field angle (unit: °). As can be seen from the figure, the F-tan theta distortion of the optical lens is controlled within +/-40%, the trend of the F-tan theta distortion curve is smooth, the image compression of the edge large-angle area is smooth, the definition of the expanded image is effectively improved, and the optical lens can better correct the F-tan theta distortion.
Fig. 11 shows a relative illuminance curve of example 2, which represents relative illuminance values at different angles of field of view on an imaging plane, with the horizontal axis representing a half field angle (unit: °) and the vertical axis representing the relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens at the maximum half field angle is still greater than 70%, indicating that the optical lens has good relative illuminance.
Fig. 12 shows MTF (modulation transfer function) graphs of embodiment 2, which represent the degree of modulation of lens imaging at different spatial frequencies for each field of view, with the horizontal axis representing the spatial frequency (unit: lp/mm) and the vertical axis representing the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.3 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 from the center to the edge field of view, and the image has better imaging quality and better detail resolution capability under the conditions of low frequency and high frequency.
Fig. 13 shows an axial aberration curve of example 2, which represents the aberration on the optical axis at the imaging plane for each wavelength, with the horizontal axis representing the axial aberration value (unit: μm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ± 20 μm, which indicates that the optical lens can correct the axial aberration well.
Fig. 14 shows a vertical axis chromatic aberration curve of example 2, which shows chromatic aberration at different image heights on an image forming plane for each wavelength with respect to a center wavelength (0.55 μm), the horizontal axis shows a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows a normalized angle of view. 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 effectively correct the chromatic aberration of the marginal field of view and the secondary spectrum of the whole image plane.
Example 3
Referring to fig. 15, a schematic structural diagram of an optical lens system according to embodiment 3 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane 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, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;
the second lens L2 has positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface;
the fourth lens L4 has positive focal power, and both the object side surface S7 and the image side surface S8 are convex surfaces;
the fifth lens L5 has negative focal power, and both the object-side surface S9 and the image-side surface S10 are concave;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
The relevant parameters of each lens in the optical lens in example 3 are shown in table 3-1.
TABLE 3-1
The surface shape parameters of the aspherical lens of the optical lens in example 3 are shown in table 3-2.
TABLE 3-2
In the present embodiment, a field curvature graph, an F-tan θ distortion curve, a relative illuminance graph, an MTF graph, an axial aberration graph, and a vertical axis chromatic aberration graph 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 shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, with the horizontal axis representing the amount of displacement (unit: mm) and the vertical axis representing the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image plane and the sagittal image plane is controlled within +/-0.08 mm, which shows that the optical lens can well correct the field curvature.
Fig. 17 shows an F-tan θ distortion curve of example 3, which shows the F-tan θ distortion of light rays of different wavelengths at different image heights on an image forming plane, with the horizontal axis showing the F-tan θ distortion (unit:%) and the vertical axis showing the half field angle (unit:%). As can be seen from the figure, the F-tan theta distortion of the optical lens is controlled within +/-40%, the trend of the F-tan theta distortion curve is smooth, the image compression of the edge large-angle area is smooth, the definition of the expanded image is effectively improved, and the optical lens can better correct the F-tan theta distortion.
Fig. 18 shows a relative illuminance curve of example 3, which represents relative illuminance values at different angles of field of view on the imaging plane, with the horizontal axis representing the half field angle (unit: °) and the vertical axis representing the relative illuminance (unit:%). As can be seen from the figure, the relative luminance value of the optical lens at the maximum half field angle is still greater than 70%, indicating that the optical lens has good relative luminance.
Fig. 19 shows MTF (modulation transfer function) graphs of embodiment 3, which represent lens imaging modulation degrees of different spatial frequencies for each field of view, with the horizontal axis representing the spatial frequency (unit: lp/mm) and the vertical axis representing MTF values. As can be seen from the figure, the MTF value of the embodiment is above 0.3 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 from the center to the edge field of view, and the image has better imaging quality and better detail resolution capability under the conditions of low frequency and high frequency.
Fig. 20 shows an axial aberration curve of example 3, which represents the aberration on the optical axis at the imaging plane for each wavelength, with the horizontal axis representing the axial aberration value (unit: μm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ± 20 μm, which indicates that the optical lens can correct the axial aberration well.
Fig. 21 shows a vertical axis chromatic aberration curve of example 3, which shows chromatic aberration at different image heights on an image forming plane for each wavelength with respect to a center wavelength (0.55 μm), the horizontal axis shows a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows a normalized angle of view. 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 effectively correct the chromatic aberration of the marginal field of view and the secondary spectrum of the whole image plane.
Example 4
Referring to fig. 22, a schematic structural diagram of an optical lens system according to embodiment 4 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a diaphragm 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 L1 has negative focal power, and both the object side surface S1 and the image side surface S2 are concave surfaces;
the second lens L2 has positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface;
the fourth lens L4 has positive focal power, and both the object-side surface S7 and the image-side surface S8 are convex surfaces;
the fifth lens L5 has negative focal power, and both the object-side surface S9 and the image-side surface S10 are concave;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
The relevant parameters of each lens in the optical lens in example 4 are shown in table 4-1.
TABLE 4-1
The surface shape parameters of the aspherical lens of the optical lens in example 4 are shown in table 4-2.
TABLE 4-2
In the present embodiment, a field curvature graph, an F-tan θ distortion curve, a relative illuminance graph, an MTF graph, an axial aberration graph, and a vertical axis chromatic aberration graph 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, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, with the horizontal axis representing the amount of displacement (unit: mm) and the vertical axis representing the half field angle (unit: °). As can be seen from the figure, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.06mm, which indicates that the optical lens can correct the field curvature well.
Fig. 24 shows an F-tan θ distortion curve of example 4, which shows F-tan θ distortions at different image heights on an image forming plane for light rays of different wavelengths, with the abscissa showing the F-tan θ distortion (unit:%) and the ordinate showing the half field angle (unit: °). As can be seen from the figure, the F-tan theta distortion of the optical lens is controlled within +/-40%, the trend of the F-tan theta distortion curve is smooth, the image compression of the edge large-angle area is smooth, the definition of the expanded image is effectively improved, and the optical lens can better correct the F-tan theta distortion.
Fig. 25 shows a relative illuminance curve of example 4, which represents relative illuminance values at different angles of field of view on the imaging plane, with the horizontal axis representing the half field angle (unit: °), and the vertical axis representing the relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens at the maximum half field angle is still greater than 70%, indicating that the optical lens has good relative illuminance.
Fig. 26 shows MTF (modulation transfer function) graphs of embodiment 4, which represent the degree of modulation of lens imaging at different spatial frequencies for each field of view, with the horizontal axis representing the spatial frequency (unit: lp/mm) and the vertical axis representing the MTF value. It can be seen from the figure that the MTF values of the present embodiment are both above 0.3 in the full field of view, and in the range of 0-160 lp/mm, the MTF curves decrease uniformly and smoothly in the process from the center to the edge field of view, and have better imaging quality and better detail resolution capability in both low frequency and high frequency.
Fig. 27 shows an axial aberration curve of example 4, which represents the aberration on the optical axis at the imaging plane for each wavelength, with the horizontal axis representing the axial aberration value (unit: μm) and the vertical axis representing the normalized pupil radius. As can be seen from the figure, the shift amount of the axial aberration is controlled within ± 20 μm, which indicates that the optical lens can correct the axial aberration well.
Fig. 28 shows a vertical axis chromatic aberration curve of example 4, which shows chromatic aberration at different image heights on an image forming plane for each wavelength with respect to a center wavelength (0.55 μm), the horizontal axis shows a vertical axis chromatic aberration value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis shows a normalized angle of view. 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 the chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Please refer to table 5, which shows the optical characteristics corresponding to the above embodiments, including the effective focal length f, the total optical length TTL, the aperture FNO, the real image height IH, and the maximum field angle FOV of the optical lens, and the values corresponding to each conditional expression in the embodiments.
TABLE 5
In summary, the optical lens of the embodiment of the invention realizes the advantages of large field angle, large aperture, high definition and high imaging quality by reasonably matching the combination of the lens shapes and the focal powers among the lenses.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical lens system comprising seven lens elements, in order from an object side to an image plane along an optical axis:
the image side surface of the first lens is a concave surface;
a second lens having a positive refractive power, the object-side surface of which is concave and the image-side surface of which is convex;
a diaphragm;
a third lens with positive focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
a fourth lens having positive refractive power, both of an object-side surface and an image-side surface of which are convex surfaces;
a fifth lens element having a negative refractive power, both the object-side surface and the image-side surface of the fifth lens element being concave;
a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex;
a seventh lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
the maximum field angle FOV of the optical lens, the real image height IH corresponding to the maximum field angle and the object side surface effective working caliber D of the first lens 1 Satisfies the following conditions: d is more than 0.6 1 /IH/tan(FOV/2)＜0.8。
2. An optical lens according to claim 1, wherein the total optical length TTL and the effective focal length f satisfy: TTL/f is more than 4.2 and less than 5.0.
3. The optical lens according to claim 1, wherein a real image height IH of the optical lens corresponding to an effective focal length f and a maximum field angle satisfies: IH/f is more than 1.6 and less than 1.9.
4. An optical lens according to claim 1, characterized in that the optical back focus BFL and the effective focal length f of the optical lens satisfy: BFL/f is more than 0.6 and less than 0.9.
5. The optical lens of claim 1, wherein an entrance pupil diameter EPD of the optical lens satisfies a real image height IH corresponding to a maximum field angle: IH/EPD is more than 2.5 and less than 3.0.
6. An optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the focal length f of the seventh lens 7 Satisfies the following conditions: -35.0 < f 7 /f＜-10.0。
7. An optical lens barrel according to claim 1, wherein the object side radius of curvature R of the second lens 3 Radius of curvature R of image side 4 Satisfies the following conditions: 1.5 < R 3 /R 4 Less than 2.5; focal length f of the second lens 2 And center thickness CT 2 Satisfies the following conditions: f is more than 5.0 2 /CT 2 ＜13.0。
8. An optical lens barrel according to claim 1, wherein the fifth lens has an object side curvature radius R 9 And the image side surface curvature radius R of the sixth lens 12 Satisfies the following conditions: 1.4 < R 9 /R 12 ＜2.0。
9. An optical lens according to claim 1, characterized in that the seventh lensImage side rise Sag of mirror 14 And light passing semi-aperture d 14 Satisfies the following conditions: sag 0 14 /d 14 ＜0.3。
10. An optical lens according to claim 1, wherein a total optical length TTL of the optical lens and a sum Σ CT of central thicknesses of the first lens to the seventh lens along an optical axis, respectively, satisfy: 0.6 < ∑ CT/TTL.
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| US10222590B1 (en) * | 2017-10-19 | 2019-03-05 | AAC Technologies Pte. Ltd. | Camera optical lens |
| CN112684593A (en) * | 2021-01-25 | 2021-04-20 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114089500A (en) * | 2020-08-24 | 2022-02-25 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN114488493A (en) * | 2022-04-18 | 2022-05-13 | 江西联益光学有限公司 | Optical lens |
| CN114815167A (en) * | 2022-05-27 | 2022-07-29 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10222590B1 (en) * | 2017-10-19 | 2019-03-05 | AAC Technologies Pte. Ltd. | Camera optical lens |
| CN114089500A (en) * | 2020-08-24 | 2022-02-25 | 宁波舜宇车载光学技术有限公司 | Optical lens and electronic device |
| CN112684593A (en) * | 2021-01-25 | 2021-04-20 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114488493A (en) * | 2022-04-18 | 2022-05-13 | 江西联益光学有限公司 | Optical lens |
| CN114815167A (en) * | 2022-05-27 | 2022-07-29 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
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