CN120276128B - Optical lens - Google Patents
Optical lensInfo
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- CN120276128B CN120276128B CN202510763945.7A CN202510763945A CN120276128B CN 120276128 B CN120276128 B CN 120276128B CN 202510763945 A CN202510763945 A CN 202510763945A CN 120276128 B CN120276128 B CN 120276128B
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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
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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Abstract
本发明提供了一种光学镜头，共七片透镜，沿光轴从物侧到成像面依次包括：具有正光焦度的第一透镜，其物侧面为凸面，其像侧面为凹面；具有正光焦度的第二透镜；具有负光焦度的第三透镜，其物侧面为凹面，其像侧面为凹面；具有正光焦度的第四透镜，其物侧面为凸面，其像侧面为凸面；具有负光焦度的第五透镜，其物侧面为凹面，其像侧面为凸面；具有正光焦度的第六透镜，其物侧面为凸面；具有负光焦度的第七透镜，其物侧面为凹面。本发明提供的光学镜头，通过特定的表面形状搭配和合理的光焦度分配，使镜头具有长焦、大光圈、高成像品质等一个或多个优点。
The present invention provides an optical lens having seven lenses, which include, in order from the object side to the imaging surface along the optical axis: a first lens having positive optical power, whose object side surface is convex and whose image side surface is concave; a second lens having positive optical power; a third lens having negative optical power, whose object side surface is concave and whose image side surface is concave; a fourth lens having positive optical power, whose object side surface is convex and whose image side surface is convex; a fifth lens having negative optical power, whose object side surface is concave and whose image side surface is convex; a sixth lens having positive optical power, whose object side surface is convex; and a seventh lens having negative optical power, whose object side surface is concave. The optical lens provided by the present invention has one or more advantages such as telephoto, large aperture, and high imaging quality through specific surface shape matching and reasonable optical power distribution.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
Along with the continuous improvement of the requirements of people on driving experience, the vehicle-mounted application optical lens is increasingly used in intelligent driving, and the position of the vehicle-mounted optical lens in the related industries of automobiles is continuously improved.
Advanced Driving Assistance Systems (ADASs) play an important role in intelligent driving, and collect environmental information through various lenses in combination with sensors to ensure driving safety of drivers. In addition to the light, thin, short, small, and high-pixel and high-resolution characteristics of the conventional ADAS system lens, the optical lens is required to be capable of clearly imaging under a low-illuminance condition, so that it is required to develop an optical lens with good imaging effect.
Disclosure of Invention
In view of the foregoing, an object of the present invention is to provide an optical lens having an advantage of excellent imaging quality.
The invention adopts the technical scheme that:
an optical lens comprising seven lenses in order from an object side to an imaging surface along an optical axis:
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens having positive optical power;
The third lens with negative focal power has a concave object side surface and a concave image side surface;
A fourth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
A fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens with positive focal power, the object side surface of which is a convex surface;
a seventh lens with negative focal power, the object side surface of which is a concave surface;
the object-side curvature radius R1 of the first lens and the image-side curvature radius R2 of the first lens satisfy-0.8 < (R1-R2)/(R1+R2) < -0.1, and the object-side curvature radius R5 of the third lens and the image-side curvature radius R6 of the third lens satisfy | (R5+R6)/(R5-R6) | <0.9.
Further preferably, the optical total length TTL of the optical lens and the effective focal length f of the optical lens meet 2< TTL/f <2.5, and the real image height IH corresponding to the maximum field angle of the optical lens and the optical total length TTL of the optical lens meet 4< TTL/IH <4.8.
Further preferably, the maximum field angle FOV of the optical lens and the aperture value FNo of the optical lens satisfy 15 DEG < FOV/FNo <20 DEG, and the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 0.8< IH/EPD <1.
Further preferably, the object side surface light passing half aperture d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens meet 6.5< d 1/(IH/2)/tan (FOV/2) <8.5, and the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens meet-37 < f123/f4567< -5.5.
Further preferably, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy 1.3< f1/f <5.5, the object-side surface curvature radius R1 of the first lens and the effective focal length f of the optical lens satisfy 0.85< R1/f <1.6, and the image-side surface curvature radius R2 of the first lens and the effective focal length f of the optical lens satisfy 2< R2/f <5.8.
Further preferably, the effective focal length f of the optical lens and the focal length f3 of the third lens meet the condition that 1.7< f3/f < -0.6, the object side curvature radius R5 of the third lens and the effective focal length f of the optical lens meet the condition that 4< R5/f < -1.3, and the image side curvature radius R6 of the third lens and the effective focal length f of the optical lens meet the condition that 0.4< R6/f <3.
Further preferably, the effective focal length f of the optical lens and the focal length f4 of the fourth lens meet 0.4< f4/f <0.7, the object-side curvature radius R7 of the fourth lens and the effective focal length f of the optical lens meet 0.6< R7/f <0.8, and the image-side curvature radius R8 of the fourth lens and the effective focal length f of the optical lens meet-0.65 < R8/f < -0.3.
Further preferably, the effective focal length f of the optical lens and the focal length f5 of the fifth lens meet the condition that 2< f5/f < -0.9, the object side curvature radius R9 of the fifth lens and the effective focal length f of the optical lens meet the condition that 0.65< R9/f < -0.3, and the image side curvature radius R10 of the fifth lens and the effective focal length f of the optical lens meet the condition that 1.2< R10/f < -0.6.
Further preferably, the focal length f7 of the seventh lens and the effective focal length f of the optical lens meet-0.9 < f7/f < -0.5, and the object side curvature radius R13 of the seventh lens and the effective focal length f of the optical lens meet-1.1 < R13/f < -0.4.
Further preferably, the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy-0.5 < (R9-R10)/(R9 + R10) < -0.1, and the object-side radius of curvature R7 of the fourth lens and the image-side radius of curvature R8 of the fourth lens satisfy 0< (R7 + R8)/(R7-R8) <0.5.
According to the optical lens provided by the invention, seven lenses with specific focal power are adopted, and through specific surface shape collocation and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration is reduced, the imaging quality of the optical lens is improved, and the lens has one or more advantages of long focus, large aperture, high imaging quality and the like.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an optical lens in embodiment 1 of the present invention.
Fig. 2 is a graph showing a field curvature of an optical lens in embodiment 1 of the present invention.
Fig. 3 is a distortion curve of F-Tan (Theta) of the optical lens in embodiment 1 of the present invention.
Fig. 4 is an MTF graph of the optical lens in example 1 of the present invention.
Fig. 5 is a schematic structural diagram of an optical lens in embodiment 2 of the present invention.
Fig. 6 is a graph showing a field curvature of an optical lens in embodiment 2 of the present invention.
Fig. 7 is a distortion curve of F-Tan (Theta) of the optical lens in embodiment 2 of the present invention.
Fig. 8 is an MTF graph of the optical lens in example 2 of the present invention.
Fig. 9 is a schematic structural diagram of an optical lens in embodiment 3 of the present invention.
Fig. 10 is a graph showing a field curvature of an optical lens in embodiment 3 of the present invention.
Fig. 11 is a distortion curve of F-Tan (Theta) of the optical lens in embodiment 3 of the present invention.
Fig. 12 is an MTF graph of the optical lens in example 3 of the present invention.
Fig. 13 is a schematic structural diagram of an optical lens in embodiment 4 of the present invention.
Fig. 14 is a graph showing the field curvature of an optical lens in embodiment 4 of the present invention.
Fig. 15 is a distortion curve of F-Tan (Theta) of the optical lens in example 4 of the present invention.
Fig. 16 is an MTF graph of an optical lens in example 4 of the present invention.
Fig. 17 is a schematic diagram of the structure of an optical lens in embodiment 5 of the present invention.
Fig. 18 is a graph showing the field curvature of an optical lens in embodiment 5 of the present invention.
Fig. 19 is a distortion curve of F-Tan (Theta) of the optical lens in example 5 of the present invention.
Fig. 20 is an MTF graph of the optical lens in example 5 of the present invention.
Fig. 21 is a schematic structural diagram of an optical lens in embodiment 6 of the present invention.
Fig. 22 is a graph showing the field curvature of an optical lens in embodiment 6 of the present invention.
Fig. 23 is a distortion curve of F-Tan (Theta) of the optical lens in example 6 of the present invention.
Fig. 24 is an MTF graph of the optical lens in example 6 of the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
For a better understanding of the 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 invention.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region, and 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 provided by the embodiment of the invention consists of seven lenses, and the seven lenses are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from an object side to an imaging surface along an optical axis.
In some embodiments, the first lens may have positive optical power, with the object-side surface being convex and the image-side surface being concave. The second lens element may have positive refractive power, wherein the object-side surface thereof may be concave or convex, and the image-side surface thereof may be concave or convex. The third lens element may have negative refractive power, wherein an object-side surface thereof is concave and an image-side surface thereof is concave. The fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The fifth lens element may have negative refractive power, wherein an object-side surface thereof is concave and an image-side surface thereof is convex. The sixth lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The seventh lens element with negative refractive power has a concave object-side surface and a concave image-side surface.
In some embodiments, the optical lens may further include a diaphragm, and the diaphragm may be located between the third lens and the fourth lens. It will be appreciated that the aperture is used to limit the amount of light entering to vary the brightness of the image. In addition, when the diaphragm is located between the third lens and the fourth lens, the diaphragm can reasonably distribute the actions of the first lens to the seventh lens, for example, the first lens, the second lens and the third lens can be used for receiving light rays to a greater extent, and the fourth lens to the seventh lens can be used for correcting the action of aberration, which is beneficial to balancing the structure of the whole optical system. Further, when the diaphragm is located between the third lens and the fourth lens, correction of the diaphragm aberration is facilitated.
In some embodiments, the optical lens may further include an optical filter and a protective glass, and the optical filter and the protective glass may be disposed between the seventh lens and the imaging surface in order along the optical axis. The optical filter is used for filtering the interference light and preventing the interference light from reaching the imaging surface of the optical lens to influence normal imaging. The protective glass plays a role in protecting the optical lens, prevents the photosensitive chip from being damaged, can improve the anti-impact and scratch-resistant capabilities of the optical lens, and has little influence on the imaging quality of the optical lens.
In some embodiments, the fourth lens and the fifth lens can be glued to form a glued lens, so that chromatic aberration of the optical lens can be effectively corrected, decentering sensitivity of the optical lens can be reduced, chromatic aberration of the optical lens can be balanced, imaging quality of the optical lens can be improved, assembly sensitivity of the optical lens can be reduced, difficulty in processing technology of the optical lens can be further reduced, and assembly yield of the optical lens can be improved.
In some embodiments, the object-side radius of curvature R1 of the first lens and the image-side radius of curvature R2 of the first lens satisfy-0.8 < (R1-R2)/(R1+R2) < -0.1. The optical lens has the advantages that the range is met, the first lens can further control the light to be stable in trend by adopting the meniscus lens, so that the light is more concentrated, the light direction can be further controlled, the back focal length is reduced, the imaging quality is improved, the light utilization rate is increased, meanwhile, the spherical aberration of the optical lens is reduced, and the imaging quality of the optical lens is improved. More specifically, -0.7< (R1-R2)/(R1+R2) < -0.17.
In some embodiments, the object-side radius of curvature R5 of the third lens and the image-side radius of curvature R6 of the third lens satisfy | (R5+R6)/(R5-R6) | <0.9. The third lens adopts double concave surfaces, has the function of diverging rays, can disperse the central rays and the edge rays of each view field, and can correct aberration generated by the front end lens. More specifically, -0.31< (R5+R6)/(R5-R6) <0.77.
In some embodiments, the optical total length TTL of the optical lens and the effective focal length f of the optical lens satisfy 2< TTL/f <2.5. The length of the lens can be effectively limited by meeting the above range, which is beneficial to realizing miniaturization of the optical lens. More specifically, 2.17< TTL/f <2.44.
In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the total optical length TTL of the optical lens meet 4< TTL/IH <4.8. The lens has larger image surface under the condition of meeting the range and ensuring the same total length of the lens, can be matched with an imaging chip with larger size to realize high-definition imaging, and better realizes the balance of small total length and large image surface of the lens. More specifically, 4.24< TTL/IH <4.48.
In some embodiments, the maximum field angle FOV of the optical lens and the aperture value FNo of the optical lens satisfy 15 DEG < FOV/FNo <20 deg. The above range is satisfied, and the optical lens is defined to have a proper angle of view and aperture value, to be able to collect light rays of a large angle and to obtain good imaging quality. More specifically, 15.78 ° < FOV/Fno <18.83 °.
In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy 0.8< IH/EPD <1. The width of the light beam entering the optical lens can be increased by meeting the range, so that the brightness of the optical lens at the image plane is improved, and the occurrence of dark angles is avoided. More specifically, 0.86< IH/EPD <0.98.
In some embodiments, the object-side light-passing half-aperture d1 of the first lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens satisfy 6.5< d 1/(IH/2)/tan (FOV/2) <8.5. The front end aperture is small when the optical lens has a large field angle and a large image plane. More specifically, 6.92< d 1/(IH/2)/tan (FOV/2) <7.87.
In some embodiments, the combined focal length f123 of the first, second, and third lenses and the combined focal length f4567 of the fourth, fifth, sixth, and seventh lenses satisfy-37 < f123/f4567< -5.5. The lens group focal length relation before and after the diaphragm is reasonably arranged, so that various aberrations of a system are balanced, and the overall imaging quality is improved. More specifically, -33.93< f123/f4567< -6.
In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy 1.3< f1/f <5.5, the object-side radius of curvature R1 of the first lens and the effective focal length f of the optical lens satisfy 0.85< R1/f <1.6, and the image-side radius of curvature R2 of the first lens and the effective focal length f of the optical lens satisfy 2< R2/f <5.8. The range is satisfied, and the first lens has positive refractive power and proper surface shape, has the function of converging light rays, and is beneficial to reducing the caliber of the rear end lens by pressing the height of peripheral light rays. More specifically, 1.44< f1/f <5.1;0.91< R1/f <1.48;2.09< R2/f <5.26.
In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy-1.7 < f3/f < -0.6, the object-side radius of curvature R5 of the third lens and the effective focal length f of the optical lens satisfy-4 < R5/f < -1.3, and the image-side radius of curvature R6 of the third lens and the effective focal length f of the optical lens satisfy 0.4< R6/f <3. The range is satisfied, so that the third lens has negative focal power and proper surface shape, has the function of diverging rays, can disperse the central rays and the edge rays of each view field, and can correct aberration generated by the front end lens. More specifically, -1.55< f3/f < -0.62, -3.64< R5/f < -1.42, 0.45< R6/f <2.69.
In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy 0.4< f4/f <0.7, the object-side radius of curvature R7 of the fourth lens and the effective focal length f of the optical lens satisfy 0.6< R7/f <0.8, the image-side radius of curvature R8 of the fourth lens and the effective focal length f of the optical lens satisfy-0.65 < R8/f < -0.3, and the object-side radius of curvature R7 of the fourth lens and the image-side radius of curvature R8 of the fourth lens satisfy 0< (R7+R8)/(R7-R8) <0.5. The above range is satisfied, and the fourth lens is defined to have appropriate positive power and surface shape, and the light rays are further converged. And the fourth lens with positive focal power and the fifth lens with negative focal power are glued, so that light can smoothly enter the rear lens, the optical path difference between different view fields can be adjusted, and the resolution is improved. More specifically, 0.47< f4/f <0.61;0.63< R7/f <0.76; 0.6< R8/f < -0.35;0.07< (R7+R8)/(R7-R8) <0.35.
In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy-2 < f5/f < -0.9, the object-side radius of curvature R9 of the fifth lens and the effective focal length f of the optical lens satisfy-0.65 < R9/f < -0.3, the image-side radius of curvature R10 of the fifth lens and the effective focal length f of the optical lens satisfy-1.2 < R10/f < -0.6, and the object-side radius of curvature R9 of the fifth lens and the image-side radius of curvature R10 of the fifth lens satisfy-0.5 < (R9-R10)/(R9+R10) < -0.1. The range is satisfied, the fifth lens is limited to have proper negative focal power and surface shape, light rays emitted by the fourth lens can be dispersed, the light rays of the edge view field are in an ascending trend, the image point on the imaging surface is beneficial to being far away from the optical axis, the effect of matching with a large chip is beneficial to being realized, a larger picture is obtained, the aberration can be effectively eliminated, and the resolution capability of the optical lens is improved. More particularly ,-1.84<f5/f<-0.99;-0.6<R9/f<-0.35;-1.08<R10/f<-0.68;-0.39<(R9-R10)/(R9+R10)<-0.26.
In some embodiments, the focal length f7 of the seventh lens and the effective focal length f of the optical lens satisfy-0.9 < f7/f < -0.5, and the object-side radius of curvature R13 of the seventh lens and the effective focal length f of the optical lens satisfy-1.1 < R13/f < -0.4. The lens has the advantages that the range is met, various aberrations generated by the front lens group can be effectively balanced, meanwhile, the divergence degree of light rays is increased, the area of the light rays entering an imaging surface is increased, the imaging of a large target surface of the lens is realized, and the imaging quality of the optical lens is improved. More specifically, -0.83< f7/f < -0.55 >, and-1.03 < R13/f < -0.42.
In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy 0.5< IH/f <0.6. The range is satisfied, the image height and the focal length of the optical lens are controlled within a reasonable range, the optical lens is facilitated to have the characteristic of a large image plane, and the imaging quality is improved. More specifically, 0.5< IH/f <0.56.
In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy 0.19< BFL/f <0.31. The optical lens is limited to have proper back focus, so that the positions of the lenses are reasonably arranged, and meanwhile, the processing and assembling difficulty is reduced.
In some embodiments, the sum of the total optical length TTL of the optical lens and the center thicknesses of the first lens to the seventh lens along the optical axis respectively ΣCT satisfies that 0.49< ΣCT/TTL <0.64. The total length of the optical lens can be effectively compressed by meeting the range, and the structural design and the production process of the optical lens are facilitated.
In some embodiments, the sum of center thicknesses ΣCT of the first lens to the seventh lens along the optical axis and the effective focal length f of the optical lens satisfy 1.09< ΣCT/f <1.55, respectively. The optical lens satisfies the above range, can effectively correct the curvature of field and distortion 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 f2 of the second lens satisfy 2.5< f2/f <38. The range is satisfied, the second lens is limited to have proper positive focal power, light is further converged, and the positive focal power at the front end of the optical lens can be shared, so that the excessive deflection of the light caused by the excessive concentration of the focal power of the first lens is avoided, and the correction difficulty of aberration is reduced. More specifically, 2.82< f2/f <34.68.
In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy 0.6< f6/f <3.9, and the object-side surface radius of curvature R11 of the sixth lens and the effective focal length f of the optical lens satisfy 0.7< R11/f <1.6. The range is met, the sixth lens is limited to have positive focal power, light convergence is facilitated, the trend of light is enabled to be stably transited to the rear, the height of the light incident to the rear is reduced, the rising trend of the light is slowed down, light energy loss caused by overlarge angle between the light with a large field of view and the principal ray of the chip when the light reaches an imaging surface is avoided, illumination of an edge field of view is facilitated to be improved, and short total optical length is facilitated to be realized. More specifically, 0.66< f6/f <3.57, 0.77< R11/f <1.44.
In some embodiments, the optical lens satisfies the following conditional expression ：12mm<f<17mm;7mm<EPD<10mm;33mm<TTL<35mm;1.6<Fno<2;16°<CRA<26°;3mm<BFL<4.4mm;29°<FOV<33°;7mm<IH<8.5mm., where f represents an effective focal length of the optical lens, EPD represents an entrance pupil diameter of the optical lens, TTL represents an optical total length of the optical lens, fno represents an aperture value of the optical lens, CRA represents a chief ray incident angle of the optical lens, BFL represents a back focal length of the optical lens, FOV represents a maximum field angle of the optical lens, and IH represents a real image height corresponding to the maximum field angle of the optical lens. The optical lens has at least one or more advantages of large target surface, large aperture, long focal length, etc. More particularly ,13.88mm<f<15.58mm;7.78mm<EPD<9.17mm;33.7mm<TTL<34.1mm;1.69<Fno<1.91;16.25°<CRA<25.12°;3.03mm<BFL<4.32mm;29.9°<FOV<32.1°;7.5mm<IH<8.1mm.
In some embodiments, the lens material in the optical lens provided by the present invention may be glass or plastic. When the lens is made of plastic, the production cost can be effectively reduced. In addition, when the lens is made of glass, the geometrical chromatic aberration of the optical system can be effectively corrected through the characteristic of low dispersion of the glass. The optical lens provided by the invention can adopt a full glass lens structure, can reduce chromatic dispersion, effectively correct chromatic aberration of the optical lens and improve imaging quality.
In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens may be spherical lenses or aspherical lenses, and compared with spherical structures, the aspherical structures can effectively reduce the aberration of the optical system, so that the number of lenses and the size of the lenses are reduced, and miniaturization of the lens is better achieved. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens of the present invention adopt spherical lenses.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present invention are intended to be equivalent substitutes within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structure of an optical lens 100 according to an embodiment 1 of the present invention is shown, where the optical lens 100 includes, in order from an object side to an imaging plane along an optical axis, a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter G1, and a cover glass G2.
The first lens element L1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave;
the second lens element L2 has positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex;
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 concave;
the fourth lens element L4 with positive refractive power has a convex object-side surface S7 and a convex image-side surface;
The fifth lens element L5 with negative refractive power has a concave object-side surface and a convex image-side surface S9;
the fourth lens L4 and the fifth lens L5 form a cemented lens group with positive optical power, i.e., the cemented surface between the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;
the sixth lens element L6 with positive refractive power has a convex object-side surface S10 and a concave image-side surface S11;
The seventh lens L7 has negative focal power, wherein an object side surface S12 is a concave surface, and an image side surface S13 is a concave surface;
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 first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are glass spherical lenses.
The relevant parameters of each lens in the optical lens 100 in embodiment 1 are shown in table 1.
TABLE 1
In the present embodiment, the field curve, the F-Tan (Theta) distortion curve, and the MTF curve of the optical lens 100 are shown in fig. 2, 3, and 4, 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-0.01 mm to 0.05mm, which indicates that the optical lens can well correct the field curvature.
Fig. 3 shows an F-Tan (Theta) distortion curve of example 1, which represents F-Tan (Theta) distortion at different image heights on an imaging plane for light rays of different wavelengths, with the horizontal axis representing F-Tan (Theta) distortion values (in:%) and the vertical axis representing half field angle (in: °). From the graph, the F-Tan (Theta) distortion of the optical lens is controlled within-6% -0, which shows that the optical lens can correct the distortion well.
Fig. 4 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 value of the embodiment is above 0.4 in the whole view field, and in the range of 0-120 lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge view field, and the MTF value has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Example 2
Referring to fig. 5, a schematic diagram of an optical lens 200 according to embodiment 2 of the present invention is shown, and the main difference between the present embodiment and embodiment 1 is that the image side surface S11 of the sixth lens element L6 is a convex surface, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The relevant parameters of each lens in the optical lens 200 in example 2 are shown in table 2.
TABLE 2
In the present embodiment, the field curve, the F-Tan (Theta) distortion curve, and the MTF curve of the optical lens 200 are shown in fig. 6, 7, and 8, respectively. As can be seen from fig. 6, the curvature of field of the meridional image plane and the sagittal image plane is controlled within 0-0.05 mm, which indicates that the optical lens can well correct curvature of field. As can be seen from fig. 7, the F-Tan (Theta) distortion of the optical lens is controlled within-5% -0, which indicates that the optical lens can correct the distortion well. As can be seen from fig. 8, the MTF values of the embodiment are above 0.38 in the whole field of view, and in the range of 0-120 lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Example 3
Referring to fig. 9, a schematic diagram of an optical lens 300 according to embodiment 3 of the present invention is shown, and the main difference between the present embodiment and embodiment 1 is that the image side surface S4 of the second lens element L2 is concave, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The relevant parameters of each lens in the optical lens 300 in example 3 are shown in table 3.
TABLE 3 Table 3
In the present embodiment, the field curve, the F-Tan (Theta) distortion curve, and the MTF curve of the optical lens 300 are shown in fig. 10, 11, and 12, respectively. As can be seen from fig. 10, the curvature of field of the meridional image plane and the sagittal image plane are controlled within-0.02 mm to 0.04mm, which indicates that the optical lens can well correct curvature of field. As can be seen from fig. 11, the F-Tan (Theta) distortion of the optical lens is controlled within-6% -0, which indicates that the optical lens can correct the distortion well. As can be seen from fig. 12, the MTF values of the embodiment are above 0.48 in the whole field of view, and in the range of 0-120 lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Example 4
Referring to fig. 13, a schematic diagram of an optical lens 400 according to embodiment 4 of the invention is shown, and the main difference between the present embodiment and embodiment 1 is that the object-side surface S3 of the second lens element L2 is concave, the image-side surface S11 of the sixth lens element L6 is convex, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The relevant parameters of each lens in the optical lens 400 in example 4 are shown in table 4.
TABLE 4 Table 4
In the present embodiment, the field curve graph, the F-Tan (Theta) distortion curve, and the MTF curve graph of the optical lens 400 are shown in fig. 14, 15, and 16, respectively. As can be seen from fig. 14, the curvature of field of the meridional image plane and the sagittal image plane is controlled within 0 to 0.05mm, which indicates that the optical lens can well correct curvature of field. As can be seen from fig. 15, the F-Tan (Theta) distortion of the optical lens is controlled within-4% -0, which indicates that the optical lens can correct the distortion well. As can be seen from fig. 16, the MTF values of the embodiment are above 0.3 in the whole field of view, and in the range of 0-120 lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Example 5
Referring to fig. 17, a schematic diagram of an optical lens 500 according to embodiment 5 of the present invention is shown, and the main difference between the present embodiment and embodiment 1 is that the image side surface S13 of the seventh lens L7 is a convex surface, and the optical parameters such as the radius of curvature and the lens thickness of each lens surface are different.
The relevant parameters of each lens in the optical lens 500 in example 5 are shown in table 5.
TABLE 5
In the present embodiment, the field curve graph, the F-Tan (Theta) distortion curve, and the MTF curve graph of the optical lens 500 are shown in fig. 18, 19, and 20, respectively. As can be seen from fig. 18, the curvature of field of the meridional image plane and the sagittal image plane is controlled within 0 to 0.05mm, which indicates that the optical lens can well correct curvature of field. As can be seen from fig. 19, the F-Tan (Theta) distortion of the optical lens is controlled within-4% -0, which indicates that the optical lens can correct the distortion well. As can be seen from fig. 20, the MTF values of the embodiment are above 0.45 in the whole field of view, and in the range of 0-120 lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Example 6
Referring to fig. 21, a schematic structural diagram of an optical lens 600 according to an embodiment 6 of the present invention is shown, and the main difference between the present embodiment and the embodiment 1 is that the image side surface S4 of the second lens element L2 is concave, the image side surface S11 of the sixth lens element L6 is convex, and the optical parameters such as the radius of curvature and the lens thickness of the lens surfaces are different.
The relevant parameters of each lens in the optical lens 600 in example 6 are shown in table 6.
TABLE 6
In the present embodiment, the field curve graph, the F-Tan (Theta) distortion curve, and the MTF curve graph of the optical lens 600 are shown in fig. 22, 23, and 24, respectively. As can be seen from fig. 22, the curvature of field of the meridional image plane and the sagittal image plane are controlled within-0.02 mm to 0.05mm, which indicates that the optical lens can well correct curvature of field. As can be seen from fig. 23, the F-Tan (Theta) distortion of the optical lens is controlled within-4% -0, which indicates that the optical lens can correct the distortion well. As can be seen from fig. 24, the MTF values of the embodiment are above 0.45 in the whole field of view, and in the range of 0-120 lp/mm, the MTF curve is uniformly and smoothly reduced in the process from the center to the edge field of view, and the MTF image has better imaging quality and better detail resolution under the conditions of low frequency and high frequency.
Referring to table 7, the optical characteristics corresponding to the above embodiments include the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field angle, the maximum field angle FOV, and the numerical value corresponding to each conditional expression in each embodiment.
TABLE 7
In summary, according to the optical lens provided by the embodiment of the invention, seven lenses with specific focal power are adopted, and through specific surface shape collocation and reasonable focal power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be improved, and the lens has one or more advantages of long focus, large aperture, high imaging quality and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
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