CN116699803A - optical lens - Google Patents
optical lens Download PDFInfo
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- CN116699803A CN116699803A CN202310777693.4A CN202310777693A CN116699803A CN 116699803 A CN116699803 A CN 116699803A CN 202310777693 A CN202310777693 A CN 202310777693A CN 116699803 A CN116699803 A CN 116699803A
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The application provides an optical lens, seven lenses altogether, including in order from the object side to the imaging surface along the optical axis: the first lens with negative focal power has a convex object side surface and a concave image side surface; a second lens having negative optical power, both the object-side surface and the image-side surface of which are concave surfaces; a third lens having negative optical power; a fourth lens element with positive refractive power having convex object-side and image-side surfaces; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a sixth lens with positive focal power, the object side surface of which is a convex surface; a seventh lens element with positive optical power having convex object-side and image-side surfaces; the object side surface curvature radius R of the second lens 3 Radius of curvature R of image side of second lens 4 The method meets the following conditions: i (R) 3 ‑R 4 )/(R 3 +R 4) I > 3.0. The application provides an optical deviceThe lens improves the imaging quality of the optical lens, reduces the aberration and improves the imaging quality of the optical lens through reasonable configuration of the lens surfaces and reasonable collocation of the focal power.
Description
Technical Field
The application relates to the technical field of imaging lenses, in particular to an optical lens.
Background
Along with the continuous improvement of the requirements of people on driving experience, the vehicle-mounted application optical lens is increasingly used in intelligent driving, and the position of the vehicle-mounted optical lens in the related industries of automobiles is continuously improved.
The panoramic all-around system is characterized in that a plurality of all-around cameras capable of covering all view field ranges around the vehicle are erected around the vehicle, the view angles of the cameras are fused into a vehicle body top view with 360 degrees around, and finally the vehicle body top view is displayed on a screen of a center console, so that a driver can clearly see whether obstacles exist around the vehicle and know the relative positions and distances of the obstacles, and the driver can park the vehicle easily. The vehicle parking device is quite visual, no blind spot exists, a driver can control the vehicle to park in a position from the container or pass through a complex road surface, and accidents such as scratching, collision and collapse are effectively reduced.
At present, a wide-angle lens is generally adopted for an all-round photographing lens, so that the problems of large aberration, large field curvature, poor imaging quality and the like exist, and the user requirements are difficult to meet.
Disclosure of Invention
In view of the foregoing, an object of the present application is to provide an optical lens having an advantage of excellent imaging quality.
The application provides an optical lens, seven lenses altogether, including in order from the object side to the imaging plane along the optical axis:
the first lens with negative focal power has a convex object side surface and a concave image side surface;
a second lens having negative optical power, both the object-side surface and the image-side surface of which are concave surfaces;
a third lens having negative optical power;
a fourth lens element with positive refractive power having convex object-side and image-side surfaces;
a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a sixth lens with positive focal power, the object side surface of which is a convex surface;
a seventh lens element with positive optical power having convex object-side and image-side surfaces;
the object side surface curvature radius R of the second lens 3 Radius of curvature R of image side of second lens 4 The method meets the following conditions: i (R) 3 -R 4 )/(R 3 +R 4) |＞3.0。
Further preferably, the optical total length TTL and the effective focal length f of the optical lens satisfy: 10.0< TTL/f <13.0.
Further preferably, the effective focal length f of the optical lens and the radian θ of the maximum half field angle and the real image height IH corresponding to the maximum field angle satisfy: 0.9< (IH/2)/(fXθ) <1.0.
Further preferably, the maximum field angle FOV and the aperture value FNO of the optical lens satisfy: 110 ° < FOV/FNO <140 °.
Further preferably, a sum Σct of an optical total length TTL of the optical lens and center thicknesses of the first lens to the seventh lens along the optical axis, respectively, satisfies: sigma CT/TTL is 0.4 < 0.7.
Further preferably, the effective focal length f of the optical lens is equal to the focal length f of the first lens 1 The method meets the following conditions: -4.0<f 1 /f<-2.5。
Further preferably, the effective focal length f of the optical lens and the focal length f of the second lens 2 The method meets the following conditions: -3.5<f 2 /f<-2.5。
Further preferably, the effective focal length f of the optical lens and the focal length f of the fourth lens 4 The method meets the following conditions: 2.0<f 4 /f<5.0。
Further preferably, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 The method meets the following conditions: -6.0<f 5 /f<-3.0。
Further preferably, the effective focal length f of the optical lens and the focal length f of the sixth lens 6 The method meets the following conditions: 1.0<f 6 /f<2.0。
The optical lens provided by the application improves the imaging quality of the optical lens, reduces the aberration and improves the imaging quality of the optical lens through reasonable configuration of the surface types of the lenses and reasonable collocation of the focal power.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an optical lens in embodiment 1 of the present application.
Fig. 2 is a graph showing a field curvature of an optical lens in embodiment 1 of the present application.
Fig. 3 is an F-Theta distortion curve of the optical lens in embodiment 1 of the present application.
Fig. 4 is a graph showing the relative illuminance of the optical lens in embodiment 1 of the present application.
Fig. 5 is an MTF graph of the optical lens in example 1 of the present application.
Fig. 6 is an axial aberration diagram of the optical lens in embodiment 1 of the present application.
Fig. 7 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 1 of the present application.
Fig. 8 is a schematic structural diagram of an optical lens in embodiment 2 of the present application.
Fig. 9 is a graph showing a field curvature of an optical lens in embodiment 2 of the present application.
Fig. 10 is an F-Theta distortion curve of the optical lens in embodiment 2 of the present application.
Fig. 11 is a graph showing the relative illuminance of the optical lens in embodiment 2 of the present application.
Fig. 12 is an MTF graph of the optical lens in example 2 of the present application.
Fig. 13 is an axial aberration diagram of an optical lens in embodiment 2 of the present application.
Fig. 14 is a vertical axis chromatic aberration chart of the optical lens in embodiment 2 of the present application.
Fig. 15 is a schematic structural diagram of an optical lens in embodiment 3 of the present application.
Fig. 16 is a graph showing the field curvature of an optical lens in embodiment 3 of the present application.
FIG. 17 is a graph showing F-Theta distortion of an optical lens in example 3 of the present application.
Fig. 18 is a graph showing the relative illuminance of the optical lens in embodiment 3 of the present application.
Fig. 19 is an MTF graph of the optical lens in example 3 of the present application.
Fig. 20 is an axial aberration diagram of an optical lens in embodiment 3 of the present application.
Fig. 21 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 3 of the present application.
Fig. 22 is a schematic structural diagram of an optical lens in embodiment 4 of the present application.
Fig. 23 is a graph showing a field curvature of an optical lens in embodiment 4 of the present application.
FIG. 24 is a graph showing F-Theta distortion of an optical lens in example 4 of the present application.
Fig. 25 is a graph showing the relative illuminance of the optical lens in embodiment 4 of the present application.
Fig. 26 is an MTF graph of the optical lens in example 4 of the present application.
Fig. 27 is an axial aberration diagram of an optical lens in embodiment 4 of the present application.
Fig. 28 is a vertical axis chromatic aberration chart of the optical lens in embodiment 4 of the application.
Fig. 29 is a schematic diagram of the structure of an optical lens in embodiment 5 of the present application.
Fig. 30 is a graph showing the field curvature of an optical lens in example 5 of the present application.
FIG. 31 is a graph showing F-Theta distortion of an optical lens in example 5 of the present application.
Fig. 32 is a graph showing the relative illuminance of the optical lens in embodiment 5 of the present application.
Fig. 33 is an MTF graph of the optical lens in example 5 of the present application.
Fig. 34 is an axial aberration diagram of the optical lens in embodiment 5 of the present application.
Fig. 35 is a graph showing a vertical axis chromatic aberration of an optical lens in embodiment 5 of the present application.
The application will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The optical lens of the embodiment of the application sequentially comprises from an object side to an imaging surface along an optical axis: the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an optical filter and protective glass.
In some embodiments, the first lens may have negative optical power, which facilitates reducing the tilt angle of incident light rays, thereby achieving effective sharing of the large field of view of the object. The object side surface of the first lens is a convex surface, and the image side surface is a concave surface, so that the light rays with the edge view fields can be collected as much as possible and enter the rear optical lens, and the collection of the light rays with a large angle can be realized.
In some embodiments, the second lens may have negative optical power with both the object-side and image-side surfaces being concave; the negative focal power of the front end of the lens can be shared, so that the light deflection overlarge caused by the overlarge focal power of the first lens is reduced, and the difficulty of chromatic aberration correction of the optical lens is reduced.
In some embodiments, the third lens can have negative focal power, which is beneficial to reducing the light deflection angle, enabling the light trend to smoothly transition, and improving the imaging quality of the optical lens.
In some embodiments, the fourth lens may have positive optical power, which is advantageous for improving the light converging power of the optical lens. The object side surface and the image side surface of the fourth lens are convex, so that various aberrations generated by the optical lens can be balanced, and the imaging quality of the optical lens can be improved.
In some embodiments, the fifth lens may have negative optical power, which is beneficial to increasing the imaging area of the optical lens and improving the imaging quality of the optical lens. The object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface, so that the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens can be improved.
In some embodiments, the sixth lens element may have positive refractive power, and the object-side surface of the sixth lens element is convex, so as to improve the light converging capability of the optical lens element, balance various aberrations generated by the optical lens element, and improve the imaging quality of the optical lens element.
In some embodiments, the seventh lens element may have positive refractive power, and the object-side surface and the image-side surface of the seventh lens element are convex, so as to facilitate pressing an angle of incidence of the marginal field of view on the imaging surface, and more light beams are effectively transmitted to the imaging surface, thereby improving the imaging quality of the optical lens element.
In some embodiments, the second lens has an object-side radius of curvature R 3 Radius of curvature R of image side of second lens 4 The method meets the following conditions: i (R) 3 -R 4 )/(R 3 +R 4) I > 3.0. Satisfying the above range is helpful for ensuring that the second lens has enough focal power to match the first lens with stronger negative focal power, so as to correct the aberration of the wide-angle lens.
In some embodiments, the optical total length TTL and the effective focal length f of the optical lens satisfy: 10.0< TTL/f <13.0. The range is satisfied, enough space is ensured to adjust the lens structure, and the imaging effect is optimized.
In some embodiments, the effective focal length f of the optical lens and the radian θ of the maximum half field angle and the real image height IH corresponding to the maximum field angle satisfy: 0.9< (IH/2)/(fXθ) <1.0. The F-Theta distortion of the optical lens is well controlled and the resolution of the optical lens is improved by meeting the above range.
In some embodiments, the maximum field angle FOV and aperture value FNO of the optical lens satisfy: 110 ° < FOV/FNO <140 °. The method meets the range, is favorable for expanding the field angle of the optical lens and increasing the aperture of the optical lens, is favorable for acquiring more scene information by the optical lens, meets the requirement of large-range detection, and is favorable for improving the problem that the relative brightness of the edge field of view is fast to drop by realizing the characteristic of the large aperture, thereby being favorable for acquiring more scene information.
In some embodiments, the sum Σct of the total optical length TTL of the optical lens and the central thicknesses of the first lens to the seventh lens along the optical axis respectively satisfies: sigma CT/TTL is 0.4 < 0.7. Meets the above range and is beneficial to the structural design and production process of the optical lens.
In some embodiments, the effective focal length f of the optical lens is equal to the focal length f of the first lens 1 The method meets the following conditions: -4.0<f 1 /f<-2.5. The range is satisfied, the first lens has proper negative focal power, the inclination angle of incident light is reduced, the marginal view field light is collected as much as possible and enters the rear optical lens, and the collection of large-angle light is realized.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens 2 The method meets the following conditions: -3.5<f 2 /f<-2.5. The range is satisfied, the second lens has proper negative focal power, and the negative focal power at the front end of the lens can be shared, so that the excessive deflection of light caused by the excessive concentration of the focal power of the first lens is reduced, and the difficulty of chromatic aberration correction of the optical lens is reduced.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fourth lens 4 The method meets the following conditions: 2.0<f 4 /f<5.0. The range is satisfied, so that the fourth lens has proper positive focal power, and the light converging capability of the optical lens is improved. The method is beneficial to balancing various aberrations generated by the optical lens and improving the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 The method meets the following conditions: -6.0<f 5 /f<-3.0. The range is satisfied, so that the fifth lens has proper negative focal power, the imaging area of the optical lens is increased, the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the sixth lens 6 The method meets the following conditions: 1.0<f 6 /f<2.0. The above range is satisfied, the sixth lens has proper positive focal power, which is beneficial to improving the light converging capability of the optical lens and balancing various aberrations generated by the optical lens,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 seventh lens 7 The method meets the following conditions: 3.0<f 7 /f<6.0. The range is satisfied, the seventh lens has proper positive focal power, the angle of incidence of the marginal view field on the imaging surface is favorably pressed, more light beams are effectively transmitted to the imaging surface, and the imaging quality of the optical lens is improved.
In some embodiments, the focal length f of the first lens of the optical lens 1 Focal length f of the second lens 2 The method meets the following conditions: 1.0<f 1 /f 2 <1.3. The range is satisfied, so that the second lens has a smaller focal length, the pressure of the first lens on light deflection is reduced as much as possible, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the center thickness CT of the third lens along the optical axis 3 The method meets the following conditions: 0.7<CT 3 /f<3.5. The lens has the advantages that the field curvature of the ultra-wide angle lens can be improved by arranging the thicker third lens, the difficulty of lens aberration optimization is reduced, and therefore the imaging quality of the lens is improved.
In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 3.0< TTL/IH <4.0. The requirements of high image height and miniaturization of the optical lens can be effectively balanced by meeting the range.
In some embodiments, the real image height IH and the entrance pupil diameter EPD corresponding to the maximum field angle of the optical lens satisfy: 4.5< IH/EPD <7.0. The range is satisfied, the width of the light beam entering the optical lens can be increased, so that the brightness of the optical lens at the image plane is improved, and the occurrence of dark angles is avoided.
In some embodiments, the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy: 2.5< IH/f <4.0. The optical lens meets the range, is favorable for balancing the size of the angle of view and the F-Theta distortion size, and improves the imaging quality of the optical lens.
In some embodiments, the optical back focal length BFL and the effective focal length f of the optical lens satisfy: 0.6< BFL/f <1.6. The optical lens meets the above range, is beneficial to achieving balance between good imaging quality and optical back focal length easy to assemble, ensures the imaging quality of the optical lens, avoids interference between the lens and other elements, and reduces the difficulty of the assembly process of the camera module.
In some embodiments, the fifth lens and the sixth lens can be glued to form a glued lens, so that chromatic aberration of the optical lens can be effectively corrected, decentered sensitivity of the optical lens can be reduced, aberration of the optical lens can be balanced, and imaging quality of the optical lens can be improved; the assembly sensitivity of the optical lens can be reduced, the processing technology difficulty of the optical lens is further reduced, and the assembly yield of the optical lens is improved.
In some embodiments, the seventh lens may employ a surface shape of an aspherical lens to improve the resolution quality.
In order to make the system have better optical performance, an aspherical lens is adopted in the lens, and each aspherical surface shape of the optical lens meets the following equation:
wherein z is the distance between the curved surface and the curved surface vertex in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the curved surface vertex, K is the quadric surface coefficient, and A, B, C, D, E, F is the second, fourth, sixth, eighth, tenth and twelfth order surface coefficients respectively.
The application is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present application, but the embodiments of the present application are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present application are intended to be equivalent substitutes within the scope of the present application.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens provided in embodiment 1 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: the optical lens assembly includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens L2 has negative focal power, and the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave;
the fourth lens element L4 has positive refractive power, and both an object-side surface S7 and an image-side surface S8 thereof are convex;
a diaphragm ST;
the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S10 and a concave image-side surface S11;
the fifth lens element L5 and the sixth lens element L6 form a cemented lens assembly, i.e., the cemented surface between the image side surface of the fifth lens element L5 and the object side surface of the sixth lens element L6 is S10;
the seventh lens L7 has positive focal power, and both an object side surface S12 and an image side surface S13 of the seventh lens L have convex surfaces;
the object side surface S14 and the image side surface S15 of the optical filter G1 are planes;
the object side surface S16 and the image side surface S17 of the protective glass G2 are planes;
the imaging surface S18 is a plane.
The relevant parameters of each lens in the optical lens in example 1 are shown in tables 1-1.
TABLE 1-1
The surface profile parameters of the aspherical lens of the optical lens in example 1 are shown in tables 1 to 2.
TABLE 1-2
| Face number | K | A | B | C | D | E | F |
| S12 | -2.00E+02 | 0.00E+00 | 2.34E-04 | -1.82E-03 | 2.89E-04 | -3.73E-05 | 1.54E-06 |
| S13 | 1.82E+01 | 0.00E+00 | -1.69E-03 | -3.94E-04 | 5.63E-05 | -5.53E-06 | 2.37E-07 |
In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 2, 3, 4, 5, 6, and 7, respectively.
Fig. 2 shows a field curve of example 1, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.03 mm to 0.04mm, which shows that the optical lens can well correct the field curvature.
Fig. 3 shows the F-Theta distortion curve of example 1, which represents the F-Theta distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-Theta distortion (unit:%) and the vertical axis represents the half field angle (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within-6% -0, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 4 shows the relative illuminance curve of example 1, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 60% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 5 shows an MTF (modulation transfer function) graph of example 1, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.4 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 6 shows an axial aberration diagram of example 1, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-6-9 μm, which shows that the optical lens can better correct the axial aberration.
Fig. 7 shows a vertical axis color difference graph of example 1, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-3 mu m, which shows that the optical lens can excellently correct chromatic aberration of the marginal field of view and the secondary spectrum of the whole image surface.
Example 2
Referring to fig. 8, a schematic structural diagram of an optical lens provided in embodiment 2 of the present application is shown, and the present embodiment is mainly characterized in that the optical parameters such as the radius of curvature and the thickness of the lens are different from those of embodiment 1.
The relevant parameters of each lens in the optical lens in example 2 are shown in table 2-1.
TABLE 2-1
The surface profile parameters of the aspherical lens of the optical lens in example 2 are shown in tables 2-2.
TABLE 2-2
| Face number | K | A | B | C | D | E | F |
| S12 | -2.00E+02 | 0.00E+00 | 3.54E-03 | -3.40E-03 | 6.93E-04 | -9.83E-05 | 4.43E-06 |
| S13 | 7.90E-02 | 0.00E+00 | -1.28E-03 | -6.91E-04 | 1.15E-04 | -1.34E-05 | 5.80E-07 |
In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 9, 10, 11, 12, 13, and 14, respectively.
Fig. 9 shows a field curvature curve of example 2, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.03 mm to 0.06mm, which indicates that the optical lens can well correct the field curvature.
Fig. 10 shows an F-Theta distortion curve of example 2, which represents F-Theta distortion at different image heights on an imaging surface for light rays of different wavelengths, with the horizontal axis representing F-Theta distortion (in:%) and the vertical axis representing half field angle (in: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within-8% -0, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 11 shows the relative illuminance curve of example 2, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 50% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 12 shows an MTF (modulation transfer function) graph of example 2, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.4 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 13 shows an axial aberration diagram of example 2, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-15-10 μm, which shows that the optical lens can better correct the axial aberration.
Fig. 14 shows a vertical axis color difference graph of example 2, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within-1 mu m to 4 mu m, which shows that the optical lens can excellently correct chromatic aberration of an edge view field and a secondary spectrum of the whole image surface.
Example 3
Referring to fig. 15, a schematic structural diagram of an optical lens provided in embodiment 3 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: the optical lens assembly includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens L2 has negative focal power, and the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave;
the fourth lens element L4 has positive refractive power, and both an object-side surface S7 and an image-side surface S8 thereof are convex;
a diaphragm ST;
the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S10 and a convex image-side surface S11;
the fifth lens element L5 and the sixth lens element L6 form a cemented lens assembly, i.e., the cemented surface between the image side surface of the fifth lens element L5 and the object side surface of the sixth lens element L6 is S10;
the seventh lens L7 has positive focal power, and both an object side surface S12 and an image side surface S13 of the seventh lens L have convex surfaces;
the object side surface S14 and the image side surface S15 of the optical filter G1 are planes;
the object side surface S16 and the image side surface S17 of the protective glass G2 are planes;
the imaging surface S18 is a plane.
The relevant parameters of each lens in the optical lens in example 3 are shown in table 3-1.
TABLE 3-1
The surface profile parameters of the aspherical lens of the optical lens in example 3 are shown in table 3-2.
TABLE 3-2
| Face number | K | A | B | C | D | E | F |
| S12 | -2.27E+01 | 0.00E+00 | -4.54E-03 | -9.27E-04 | 2.43E-04 | -5.56E-05 | 5.01E-06 |
| S13 | -2.78E+00 | 0.00E+00 | -3.91E-04 | -1.24E-03 | 2.63E-04 | -2.95E-05 | 1.38E-06 |
In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 16, 17, 18, 19, 20, and 21, respectively.
Fig. 16 shows a field curvature curve of example 3, which indicates the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis indicates the amount of shift (unit: mm), and the vertical axis indicates the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.06 mm to 0.09mm, which indicates that the optical lens can well correct the field curvature.
Fig. 17 shows an F-Theta distortion curve of example 3, which represents F-Theta distortion at different image heights on an imaging surface for light rays of different wavelengths, with the horizontal axis representing F-Theta distortion (in:%) and the vertical axis representing half field angle (in: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within-4% -0, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 18 shows the relative illuminance curve of example 3, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (unit: °), and the vertical axis represents the relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 40% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 19 shows an MTF (modulation transfer function) graph of example 3, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 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 of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 20 shows an axial aberration diagram of example 3, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the axial aberration is controlled within ±15 μm, which indicates that the optical lens can correct axial aberration well.
Fig. 21 shows a vertical axis color difference graph of example 3, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within-6 mu m to 8 mu m, which shows that the optical lens can excellently correct chromatic aberration of an edge view field and a secondary spectrum of the whole image surface.
Example 4
Referring to fig. 22, a schematic structural diagram of an optical lens provided in embodiment 4 of the present application is shown, and the present application is mainly characterized in that the optical parameters such as the radius of curvature and the thickness of the lens are different from those of embodiment 1.
The relevant parameters of each lens in the optical lens in example 4 are shown in table 4-1.
TABLE 4-1
The surface profile parameters of the aspherical lens of the optical lens in example 4 are shown in table 4-2.
TABLE 4-2
| Face number | K | A | B | C | D | E | F |
| S12 | -6.30E+00 | 0.00E+00 | -2.06E-03 | -5.98E-05 | -5.19E-05 | 5.84E-06 | -3.82E-07 |
| S13 | 1.65E+02 | 0.00E+00 | -3.59E-04 | -4.45E-04 | 3.79E-05 | -2.62E-06 | 7.40E-08 |
In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 23, 24, 25, 26, 27, and 28, respectively.
Fig. 23 shows a field curvature curve of example 4, in which the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane is shown, the horizontal axis represents the amount of shift (unit: mm), and the vertical axis represents the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.09 mm to 0.06mm, which indicates that the optical lens can well correct the field curvature.
Fig. 24 shows an F-Theta distortion curve of example 4, which represents F-Theta distortion at different image heights on an imaging surface for light rays of different wavelengths, with the horizontal axis representing F-Theta distortion (in:%) and the vertical axis representing half field angle (in: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within-8% -0, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 25 shows the relative illuminance curve of example 4, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 50% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 26 shows an MTF (modulation transfer function) graph of example 4, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.3 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 of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 27 shows an axial aberration diagram of example 4, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the axial aberration is controlled within ±10μm, which means that the optical lens can correct axial aberration well.
Fig. 28 shows a vertical axis color difference graph of example 4, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within-2 mu m to 5 mu m, which shows that the optical lens can excellently correct chromatic aberration of an edge view field and a secondary spectrum of the whole image surface.
Example 5
Referring to fig. 29, a schematic structural diagram of an optical lens provided in embodiment 5 of the present application is shown, where the optical lens includes, in order from an object side to an imaging plane along an optical axis: the optical lens assembly includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens element L1 has negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens L2 has negative focal power, and the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens element L3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex;
the fourth lens element L4 has positive refractive power, and both an object-side surface S7 and an image-side surface S8 thereof are convex;
a diaphragm ST;
the fifth lens element L5 has negative refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S10 and a concave image-side surface S11;
the fifth lens element L5 and the sixth lens element L6 form a cemented lens assembly, i.e., the cemented surface between the image side surface of the fifth lens element L5 and the object side surface of the sixth lens element L6 is S10;
the seventh lens L7 has positive focal power, and both an object side surface S12 and an image side surface S13 of the seventh lens L have convex surfaces;
the object side surface S14 and the image side surface S15 of the optical filter G1 are planes;
the object side surface S16 and the image side surface S17 of the protective glass G2 are planes;
the imaging surface S18 is a plane.
The relevant parameters of each lens in the optical lens in example 5 are shown in table 5-1.
TABLE 5-1
The surface profile parameters of the aspherical lens of the optical lens in example 5 are shown in table 5-2.
TABLE 5-2
| Face number | K | A | B | C | D | E | F |
| S12 | 2.61E+01 | 0.00E+00 | -2.12E-03 | -1.82E-04 | 5.07E-05 | -6.57E-06 | 3.36E-07 |
| S13 | -6.28E+00 | 0.00E+00 | -5.69E-05 | -2.45E-04 | 4.67E-05 | -3.48E-06 | 9.95E-08 |
In this embodiment, the field curvature curve, the F-Theta distortion curve, the relative illuminance curve, the MTF curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens are shown in fig. 30, 31, 32, 33, 34, and 35, respectively.
Fig. 30 shows a field curve of example 5, which shows the degree of curvature of light rays of different wavelengths on a meridional image plane and a sagittal image plane, the horizontal axis shows the amount of shift (unit: mm), and the vertical axis shows the half angle of view (unit: °). From the graph, the field curvature of the meridian image plane and the sagittal image plane is controlled within-0.05 mm to 0.15mm, which shows that the optical lens can well correct the field curvature.
Fig. 31 shows an F-Theta distortion curve of example 5, which represents F-Theta distortion at different image heights on an imaging surface for light rays of different wavelengths, with the horizontal axis representing F-Theta distortion (in:%) and the vertical axis representing half field angle (in: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within-6% -0, the image compression of the edge angle area is gentle, and the definition of the unfolded image is effectively improved.
Fig. 32 shows the relative illuminance curve of example 5, which represents the relative illuminance values for different field angles on the imaging plane, the horizontal axis represents the half field angle (in: °), and the vertical axis represents the relative illuminance (in:%). As can be seen from the figure, the relative illuminance value of the optical lens is still greater than 60% at the maximum half field angle, which indicates that the optical lens has better relative illuminance.
Fig. 33 shows an MTF (modulation transfer function) graph of example 5, which represents the lens imaging modulation degree of different spatial frequencies at each view field, the horizontal axis represents the spatial frequency (unit: lp/mm), and the vertical axis represents the MTF value. As can be seen from the graph, the MTF values of the embodiment are above 0.4 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly reduced in the process of the field of view from the center to the edge, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Fig. 34 shows an axial aberration diagram of example 5, which represents aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents an axial aberration value (unit: μm), and the vertical axis represents a normalized pupil radius. As can be seen from the figure, the offset of the axial aberration is controlled within-20-15 μm, which shows that the optical lens can better correct the axial aberration.
Fig. 35 shows a vertical axis color difference graph of example 5, which shows color differences at different image heights on an imaging plane for each wavelength with respect to a center wavelength (0.55 μm), with the horizontal axis showing a vertical axis color difference value (unit: μm) for each wavelength with respect to the center wavelength, and the vertical axis showing a normalized field angle. As can be seen from the figure, the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within +/-4 mu m, which shows that the optical lens can excellently correct chromatic aberration of the edge view field and the secondary spectrum of the whole image surface.
Referring to table 6, the optical characteristics corresponding to the above embodiments include the effective focal length f, the total optical length TTL, the aperture value FNO, the real image height IH, the maximum field angle FOV and the numerical value corresponding to each conditional expression in the embodiments.
TABLE 6
In summary, the optical lens provided by the application improves the imaging quality of the optical lens, reduces the aberration and improves the imaging quality of the optical lens through reasonable configuration of the surface types of the lenses and reasonable collocation of the focal power.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
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