CN115494624A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN115494624A CN115494624A CN202211433056.7A CN202211433056A CN115494624A CN 115494624 A CN115494624 A CN 115494624A CN 202211433056 A CN202211433056 A CN 202211433056A CN 115494624 A CN115494624 A CN 115494624A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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Abstract
The invention provides an optical lens, which comprises eight lenses in total, and the eight 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 negative optical power; a third lens having a focal power; a fourth lens having positive optical power; a diaphragm; a fifth lens having a positive optical power; a sixth lens having positive optical power; a seventh lens having a negative optical power; an eighth lens having positive optical power; effective focal length f of optical lens and focal length f of third lens 3 Satisfies the following conditions: 30 < | f 3 And/f |. The optical lens has the advantages of large field angle, large aperture, high definition and high 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 requirement of using the large-field vehicle-mounted lens, the conventional wide-angle vehicle-mounted lens still has many defects, 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 large field angle, 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 system comprises eight lens elements, in order from an object side to an image plane along an optical axis:
the first lens with negative focal power has a convex object-side surface and a concave image-side surface;
a second lens element having a negative refractive power, both the object-side surface and the image-side surface of which are concave surfaces;
a third lens with focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave 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 diaphragm;
a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex;
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 having a negative refractive power, both the object-side surface and the image-side surface of which are concave surfaces;
an eighth lens having positive refractive power, both of an object-side surface and an image-side surface of which are convex surfaces;
an effective focal length f of the optical lens and a focal length f of the third lens 3 Satisfies the following conditions: 30 < | f 3 /f|。
Preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is more than 7.5 and less than 9.5.
Preferably, the effective focal length f, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.5 < (IH/2)/(fXtan (FOV/2)) < 0.6.
Preferably, the effective focal length f of the optical lens and the focal length f of the first lens are equal 1 Satisfies the following conditions: -3.0 < f 1 /f＜0。
Preferably, the effective focal length f of the optical lens and the focal length f of the eighth lens are equal 8 Satisfies the following conditions: f is more than 0 8 /f＜2.5。
Preferably, the combined focal length f of a lens in front of a diaphragm of the optical lens Front side Combined focal length f with diaphragm rear lens Rear end Satisfies the following conditions: -1.8 < f Front part /f Rear end ＜-1.0。
Preferably, the focal length f of the sixth lens 6 Focal length f of the seventh lens 7 Satisfies the following conditions: -1.8 < f 6 /f 7 ＜-1.3。
Preferably, the third lens has an object-side radius of curvature R 5 Radius of curvature R of image-blending side surface 6 Satisfies the following conditions: r is more than 0.5 5 /R 6 ＜1.6。
Preferably, the object side rise Sag of the first lens 1 And light passing half aperture d 1 And an image-side rise Sag of the first lens 2 And light passing semi-aperture d 2 Respectively satisfy: sag of 0 1 /d 1 ＜0.3，0.6＜Sag 2 /d 2 ＜0.9。
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 eighth lens element along the optical axis satisfy: 0.5 < ∑ CT/TTL < 0.65.
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 illuminance curve of the 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 curves of the optical lens system according to 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 embodiment 2 of the present invention;
fig. 11 is a graph showing a relative illumination 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 view 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 unit according to embodiment 3 of the present invention;
fig. 21 is a vertical axis chromatic aberration diagram of the optical lens system 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 an 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 only used 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 a list of listed features, 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 an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the present application, the embodiments and features of the embodiments 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 third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth 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 object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface, so that the first lens is beneficial to collecting large-field light rays as far as possible to enter the rear optical lens.
In some embodiments, the second lens element may have a negative focal power, and the negative focal power of the front end of the optical lens element can be shared, so that the problem that light is excessively deflected due to the excessively concentrated focal power of the first lens element is avoided, and the difficulty in correcting chromatic aberration of the optical lens element is reduced. The object side surface and the image side surface of the second lens are both concave surfaces, so that light rays which are emitted after passing through the first lens can be collected, the light rays are in smooth transition, and the imaging quality of the optical lens is improved.
In some embodiments, the object-side surface of the third lens element is convex, and the image-side surface of the third lens element is concave, which is beneficial for converging light rays, so that the diverged light rays smoothly enter the rear of the third lens element, thereby enabling the light rays to smoothly transit in trend and improving the imaging quality of the optical lens.
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 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 fifth lens are convex surfaces, so that the light focusing position reflected by the object side surface of the fifth lens is located at the rear of the image side surface, the design ghost of the optical lens is effectively improved, the influence of the coma aberration of the fifth lens on the optical lens can be reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the sixth lens element may have positive refractive power, which is favorable 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 sixth lens are convex surfaces, so that the influence of the 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 and the image side surface of the seventh lens are both concave surfaces, and light rays of a central view field can be converged, so that the total length of the optical lens is compressed.
In some embodiments, the eighth lens may have a positive power, which is beneficial to reduce the light deflection angle while converging light, and control the incident angle of the chief ray of the maximum field angle of the optical lens on the image plane within a range matched with the image sensor. The object side surface and the image side surface of the eighth lens are convex surfaces, so that the influence of the self coma aberration of the eighth lens on the optical lens is reduced, and the imaging quality of the optical lens is improved.
In some embodiments, a diaphragm for limiting the light beam may be disposed between the fourth lens and the fifth lens, and the diaphragm may be disposed near an object-side surface of the fifth lens, so as to reduce generation of ghost images of the optical lens, and facilitate converging light entering the optical system and reduce a rear aperture of the optical lens.
In some embodiments, the sixth lens and the seventh 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, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is more than 7.5 and less than 9.5. The range is met, the length of the lens can be effectively limited, and the miniaturization of the optical lens is facilitated.
In some embodiments, the real image height IH at which the effective focal length f of the optical lens corresponds to the maximum field angle satisfies: IH/f is more than 1.8 and less than 2.1. Satisfying the above range can make the optical lens not only give consideration to the large image plane characteristics, but also have good imaging quality.
In some embodiments, the optical back focus BFL and the effective focal length f of the optical lens satisfy: 1.2 < BFL/f. The method meets the range, is favorable for obtaining balance between good imaging quality and easy-to-assemble optical back focal length, and reduces the difficulty of the camera module assembly process while ensuring the imaging quality of the optical lens.
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: 0.5 < (IH/2)/(fXtan (FOV/2)) < 0.6. Satisfying the above range indicates that the optical distortion of the optical lens is well controlled, 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 first lens are different 1 Satisfies the following conditions: -3.0 < f 1 The/f is less than 0. Satisfying the above range makes it possible to provide the first lens with an appropriate negative refractive power, which is advantageous for enlarging the field angle of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens are different 2 Satisfies the following conditions: -2.2 < f 2 The/f is less than 0. The second lens has appropriate negative focal power and can share the negative focal power of the first lens group of the optical lens, so that the optical lens is favorable for avoiding overlarge light ray deflection caused by over concentration of the focal power of the first lens, and the difficulty in correcting the chromatic aberration 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 third lens are 3 Satisfies the following conditions: 30 < | f 3 And/f |. Satisfy above-mentioned scope, can make the third lens have great focal power, be favorable to the smooth transition of light, balance the all kinds of aberrations that third lens self produced, 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 3.0. The optical lens meets the range, can enable the fourth lens to have proper positive focal power, is favorable for light smooth transition, corrects various aberrations of the optical lens, and improves the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 Satisfies the following conditions: f is more than 0 5 The/f is less than 4.0. The fifth lens has appropriate positive focal power, light can be smoothly transited, various aberrations of the optical lens are corrected, and the imaging quality of the optical lens is improved.
In some embodiments, of optical lensesEffective focal length f and focal length f of sixth lens 6 Satisfies the following conditions: f is more than 0 6 The/f is less than 2.5. The sixth lens has appropriate positive focal power, so that light can be smoothly transited, the field curvature of the optical lens is corrected, 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 Satisfies the following conditions: -1.5 < f 7 The/f is less than 0. The seventh lens has appropriate negative focal power, so that the imaging area of the optical lens can be increased, the field curvature of the optical lens can be corrected, and the imaging quality of the optical lens can be improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the eighth lens 8 Satisfies the following conditions: f is more than 0 8 The/f is less than 2.5. The eighth lens element has a proper positive focal power, so that astigmatism and curvature of field of the optical lens can be corrected, and the imaging quality of the optical lens can be improved.
In some embodiments, the combined focal length f of the pre-stop lens of the optical lens Front side Combined focal length f with diaphragm rear lens Rear end Satisfies the following conditions: -1.8 < f Front side /f Rear end < -1.0. The range is met, the combined focal length distribution of the front lens and the rear lens of the diaphragm can be close, light smooth transition is facilitated, and the imaging quality of the optical lens is improved.
In some embodiments, the focal length f of the sixth lens 6 Focal length f of seventh lens 7 Satisfies the following conditions: -1.8 < f 6 /f 7 < -1.3. The optical lens system meets the range, the focal powers of the sixth lens and the seventh lens are opposite and close, the chromatic aberration of the optical lens can be effectively corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the radius of curvature of the object-side surface of the third lens, R 5 Radius of curvature R of image-side surface 6 Satisfies the following conditions: r is more than 0.5 5 /R 6 Is less than 1.6. The third lens element meets the above range, the object side surface and the image side surface of the third lens element can obtain similar surface types, the field curvature of the third lens element can be reduced, and the imaging quality of the optical lens can be improved.
In some embodimentsMiddle, first lens object side rise Sag 1 And light passing semi-aperture d 1 And rise Sag of the image-side surface of the first lens 2 And light passing semi-aperture d 2 Respectively satisfy: sag of 0 1 /d 1 ＜0.3，0.6＜Sag 2 /d 2 Is less than 0.9. The range is met, the surface type of the off-axis view field of the object side surface of the first lens can be effectively restrained, and the small angle of the incident angle of the light rays incident to the imaging surface is ensured, so that the optical lens is ensured to have large relative illumination; the surface shape of the off-axis view field on the image side surface of the first lens can be effectively constrained, and the light rays of the marginal view field can have enough deflection angles when passing through the first lens, so that the optical lens is ensured to have a smaller rear end aperture.
In some embodiments, the total optical length TTL of the optical lens and the sum Σ CT of the central thicknesses of the first to eighth lenses along the optical axis respectively satisfy: 0.5 < ∑ CT/TTL < 0.65. 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 in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection part of each lens in the optical lens are different, and specific differences can be referred to 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 third lens L3, a fourth lens L4, an aperture stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.
The first lens L1 has negative focal power, and the object side surface S1 of the first lens L is a convex surface, and the image side surface S2 of the first lens L is a concave surface;
the second lens L2 has negative focal power, and both the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens L3 has positive focal power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave 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;
a diaphragm ST;
the fifth lens L5 has positive focal power, and both the object side surface S9 and the image side surface S10 are convex 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 L7 has negative power, and both the object-side surface S13 and the image-side surface S14 are concave;
the eighth lens element L8 has positive refractive power, and both the object-side surface S15 and the image-side surface S16 are convex surfaces;
the sixth lens L6 and the seventh lens L7 can be cemented to form a cemented lens;
the object side surface S17 and the image side surface S18 of the optical filter G1 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 +/-0.02 mm, which shows that the optical lens can excellently correct the field curvature.
Fig. 3 shows an F-tan θ distortion curve of example 1, 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 +/-50%, 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 illuminance value of the optical lens is still greater than 80% at the maximum half field angle, indicating that the optical lens has excellent relative illuminance.
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 amount of shift of the axial aberration is controlled within ± 10 μm, indicating 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 +/-4 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.
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 third lens L3, a fourth lens L4, an aperture stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.
The first lens L1 has negative focal power, and the object side surface S1 of the first lens L is a convex surface, and the image side surface S2 of the first lens L is a concave surface;
the second lens L2 has negative focal power, and both the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens L3 has positive focal power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave 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;
a diaphragm ST;
the fifth lens L5 has positive focal power, and both the object side surface S9 and the image side surface S10 are convex 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 L7 has negative power, and both the object-side surface S13 and the image-side surface S14 are concave;
the eighth lens element L8 has positive refractive power, and both the object-side surface S15 and the image-side surface S16 are convex surfaces;
the sixth lens L6 and the seventh lens L7 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 +/-0.03 mm, which shows that the optical lens can excellently correct the field curvature.
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 +/-50%, 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 is still greater than 80% at the maximum half field angle, indicating that the optical lens has excellent 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 uniformly and smoothly drops in the process of the field of view from the center to the edge, and the MTF 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 ± 30 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 +/-2 μm, 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.
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 third lens L3, a fourth lens L4, an aperture stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.
The first lens L1 has negative focal power, and the object side surface S1 of the first lens L is a convex surface, and the image side surface S2 of the first lens L is a concave surface;
the second lens L2 has negative focal power, and the object side surface S3 and the image side surface S4 are both concave surfaces;
the third lens L3 has negative focal power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave 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;
a diaphragm ST;
the fifth lens L5 has positive focal power, and both the object side surface S9 and the image side surface S10 are convex 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 L7 has negative power, and both the object-side surface S13 and the image-side surface S14 are concave;
the eighth lens element L8 has positive refractive power, and both the object-side surface S15 and the image-side surface S16 are convex surfaces;
the sixth lens L6 and the seventh lens L7 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 this embodiment, the curvature of field curve, F-tan θ distortion curve, relative illumination curve, MTF curve, axial aberration curve, and vertical axis chromatic aberration curve of the optical lens are respectively shown in fig. 16, 17, 18, 19, 20, and 21.
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 +/-0.02 mm, which shows that the optical lens can excellently correct the field curvature.
Fig. 17 shows an F-tan θ distortion curve of example 3, 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 +/-50%, 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 is still greater than 80% at the maximum half field angle, indicating that the optical lens has excellent relative luminance.
Fig. 19 shows MTF (modulation transfer function) graphs of embodiment 3, 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 present embodiment is above 0.5 in the whole field of view, and in the range of 0-160 lp/mm, the MTF curve is uniformly and smoothly dropped in the process from the center to the edge field of view, and the image quality and the detail resolution capability are excellent in both the low frequency and the 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 amount of shift of the axial aberration is controlled within ± 10 μm, indicating 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 +/-2 μm, 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.
Example 4
Fig. 22 is a schematic structural view of an optical lens system according to embodiment 4 of the present invention, 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 third lens L3, a fourth lens L4, an aperture stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.
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 negative focal power, and both the object side surface S3 and the image side surface S4 are concave surfaces;
the third lens L3 has negative focal power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave 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;
a diaphragm ST;
the fifth lens L5 has positive focal power, and both the object side surface S9 and the image side surface S10 are convex 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 L7 has negative power, and both the object-side surface S13 and the image-side surface S14 are concave;
the eighth lens element L8 has positive refractive power, and both the object-side surface S15 and the image-side surface S16 are convex surfaces;
the sixth lens L6 and the seventh lens L7 may be cemented to constitute a cemented lens.
Relevant parameters of each lens in the optical lens in embodiment 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 +/-0.02 mm, which shows that the optical lens can excellently correct the field curvature.
Fig. 24 shows an F-tan θ distortion curve of example 4, 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 +/-50%, 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 is still greater than 80% at the maximum half field angle, indicating that the optical lens has excellent 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. As can be seen from the figure, the MTF values of the present embodiment are both above 0.5 in the full field of view, and in the range of 0 to 160lp/mm, the MTF curves uniformly and smoothly drop in the course of the field of view from the center to the edge, and have excellent imaging quality and excellent detail resolving power in both low and high frequencies.
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 amount of shift of the axial aberration is controlled within ± 5 μm, indicating that the optical lens can excellently correct the axial aberration.
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 +/-2 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 herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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 embodiments only show several embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present 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 eight lenses, in order from an object side to an image plane along an optical axis:
a first lens element having a negative refractive power, the object-side surface of which is convex and the image-side surface of which is concave;
a second lens having a negative optical power, both the object-side surface and the image-side surface of which are concave;
a third lens having a focal power, the object-side surface of the third lens being convex, and the image-side surface of the third lens being concave;
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 diaphragm;
a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex;
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 having a negative refractive power, both the object-side surface and the image-side surface of which are concave surfaces;
an eighth lens having positive refractive power, both of an object-side surface and an image-side surface of which are convex surfaces;
an effective focal length f of the optical lens and a focal length f of the third lens 3 Satisfies the following conditions: 30 < | f 3 /f|。
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 7.5 and less than 9.5.
3. The optical lens according to claim 1, wherein the effective focal length f, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.5 < (IH/2)/(fXtan (FOV/2)) < 0.6.
4. 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 first lens are 1 Satisfies the following conditions: -3.0 < f 1 /f＜0。
5. 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 eighth lens 8 Satisfies the following conditions: f is more than 0 8 /f＜2.5。
6. An optical lens according to claim 1, characterized in that the combined focal length f of the front stop lens of the optical lens Front side Combined focal length f with diaphragm rear lens Rear end Satisfies the following conditions: -1.8 < f Front part /f Rear end ＜-1.0。
7. An optical lens according to claim 1, characterized in that the focal length f of the sixth lens 6 Focal length f of the seventh lens 7 Satisfies the following conditions: -1.8 < f 6 /f 7 ＜-1.3。
8. An optical lens barrel according to claim 1, wherein the third lens has an object side curvature radius R 5 Radius of curvature R of image side 6 Satisfies the following conditions: r is more than 0.5 5 /R 6 ＜1.6。
9. The optical lens of claim 1 wherein the object side rise Sag of the first lens 1 And light passing semi-aperture d 1 And an image side rise Sag of the first lens 2 And light passing semi-aperture d 2 Respectively satisfy: sag 0 1 /d 1 ＜0.3，0.6＜Sag 2 /d 2 ＜0.9。
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 eighth lens along an optical axis, respectively, satisfy: 0.5 <. Sigma CT/TTL < 0.65.
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| CN117389010A (en) * | 2023-12-11 | 2024-01-12 | 江西联创电子有限公司 | Optical lens |
| CN117471656A (en) * | 2023-12-27 | 2024-01-30 | 江西联创电子有限公司 | Optical lens |
| WO2024103957A1 (en) * | 2022-11-16 | 2024-05-23 | 江西联创电子有限公司 | Optical lens |
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| CN113267873B (en) * | 2020-02-17 | 2022-11-25 | 北京百度网讯科技有限公司 | Imaging lens and imaging device compatible with visible light and near infrared |
| CN114675406B (en) * | 2022-05-27 | 2022-10-25 | 江西联创电子有限公司 | Optical lens |
| CN115494624B (en) * | 2022-11-16 | 2023-04-07 | 江西联创电子有限公司 | Optical lens |
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| CN106199922A (en) * | 2016-07-13 | 2016-12-07 | 浙江舜宇光学有限公司 | Seven chip wide-angle lens |
| JP2018081240A (en) * | 2016-11-17 | 2018-05-24 | コニカミノルタ株式会社 | Imaging optical system and imaging apparatus |
| CN110286476A (en) * | 2019-08-20 | 2019-09-27 | 江西联创电子有限公司 | Optical imaging lens and imaging device |
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| CN117471656A (en) * | 2023-12-27 | 2024-01-30 | 江西联创电子有限公司 | Optical lens |
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