CN117406399B - Optical lens - Google Patents
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- CN117406399B CN117406399B CN202311716381.9A CN202311716381A CN117406399B CN 117406399 B CN117406399 B CN 117406399B CN 202311716381 A CN202311716381 A CN 202311716381A CN 117406399 B CN117406399 B CN 117406399B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 210
- 238000003384 imaging method Methods 0.000 claims abstract description 34
- 230000014509 gene expression Effects 0.000 claims description 40
- 230000004075 alteration Effects 0.000 description 27
- 238000013461 design Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012634 optical imaging Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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Classifications
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—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
- G02B13/0015—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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses an optical lens, which sequentially comprises from an object side to an imaging surface along an optical axis: the first lens with positive focal power has a convex object side surface and a concave image side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens having positive optical power; a fourth lens having negative optical power; a fifth lens having positive optical power; a sixth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a seventh lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region; an eighth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region. The optical lens has the advantages of high pixels, large aperture, large target surface and small distortion.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
Currently, with the popularity of portable electronic products (such as smartphones, tablets and cameras), and the popularity of social, video and live broadcast software, people have a higher and higher preference for photography, and optical lenses have become standard of electronic products and even have become the primary index considered when consumers purchase electronic products.
At present, the mainstream trend of the development of portable electronic products is ultra-thin, wide-angle, ultra-high definition imaging, etc., and this trend puts higher demands on the optical lens carried on the portable electronic products, and the pixel point size of the sensor chip is kept not reduced while the pixel point is high, so increasing the size of the sensor chip becomes an important development trend of high pixels. In addition, as the consumer uses the electronic products in more and more diversified ways, if the consumer needs to shoot in dim light environments such as overcast and rainy days and night, even in dim environments, the shooting picture of the optical lens currently carried on the electronic product in the dim environments is darker, the details are fuzzy, the shooting is unclear, and the like, so that the shooting effect is poor. Therefore, how to increase the light entering amount of the lens, so that the lens can realize high-definition imaging in a darker environment or a strong illumination environment, is also a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an optical lens having at least the advantages of high pixel, large aperture, large target surface, large wide angle and miniaturization.
The embodiment of the invention realizes the aim through the following technical scheme.
The invention provides an optical lens, which consists of eight lenses, and sequentially comprises the following components from an object side to an imaging surface along an optical axis: the first lens with positive focal power has a convex object side surface and a concave image side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a fourth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a fifth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; a sixth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a seventh lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region; an eighth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region; wherein, the optical lens satisfies the conditional expression: 1.1< TTL/f <1.2, -0.35< f3/f4< -0.05, TTL representing the total optical length of the optical lens, f representing the effective focal length of the optical lens, f3 representing the focal length of the third lens, and f4 representing the focal length of the fourth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 0.5< TTL/IH <0.63,1.9< IH/f <2.0, wherein TTL represents the total optical length of the optical lens, IH represents the image height corresponding to the maximum field angle of the optical lens, and f represents the effective focal length of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: -0.3< f1/f2< -0.2, -5< f2/f < -3, wherein f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f represents the effective focal length of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: 4< f3/f <8,0.2< R5/R6<0.8, wherein f3 represents a focal length of the third lens, f represents an effective focal length of the optical lens, R5 represents a radius of curvature of an object side surface of the third lens, and R6 represents a radius of curvature of an image side surface of the third lens.
In some embodiments, the optical lens satisfies the following conditional expression: -60< f4/f < -10,1< R7/R8<2, wherein f4 represents a focal length of the fourth lens, f represents an effective focal length of the optical lens, R7 represents a radius of curvature of an object side of the fourth lens, and R8 represents a radius of curvature of an image side of the fourth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 10< f5/f <60,0.2< R9/R10<1, where f5 denotes a focal length of the fifth lens, f denotes an effective focal length of the optical lens, R9 denotes a radius of curvature of an object side surface of the fifth lens, and R10 denotes a radius of curvature of an image side surface of the fifth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 1< f6/f <2,1.5< R11/R12<4, wherein f6 represents a focal length of the sixth lens, f represents an effective focal length of the optical lens, R11 represents a radius of curvature of an object side surface of the sixth lens, and R12 represents a radius of curvature of an image side surface of the sixth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 45< f7/f <120,0.5< R13/R14<1.5, wherein f7 represents a focal length of the seventh lens, f represents an effective focal length of the optical lens, R13 represents a radius of curvature of an object side surface of the seventh lens, and R14 represents a radius of curvature of an image side surface of the seventh lens.
In some embodiments, the optical lens satisfies the following conditional expression: -1< f8/f < -0.5, -2< R15/R16< -0.5, wherein f8 represents a focal length of the eighth lens, f represents an effective focal length of the optical lens, R15 represents a radius of curvature of an object side of the eighth lens, and R16 represents a radius of curvature of an image side of the eighth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 2< f7/f5<4, wherein f5 represents a focal length of the fifth lens and f7 represents a focal length of the seventh lens.
In some embodiments, the optical lens satisfies the following conditional expression: 45 ° < FOV/f# <55 °, wherein FOV represents the maximum field angle of the optical lens and f# represents the aperture value of the optical lens.
Compared with the prior art, the optical lens provided by the invention adopts eight lenses with specific focal power, and the lens has the characteristics of large target surface and small distortion through specific surface shape collocation and reasonable focal power distribution, so that the resolution of the lens and the image detail reduction degree can be improved, and the resolution of the lens is improved; meanwhile, the optical lens also has a large aperture characteristic, so that the luminous flux entering the lens is effectively increased, the influence of noise generated when light is insufficient on an imaging picture is reduced, and the lens can still have an excellent imaging effect in a dark environment at night, thereby meeting the imaging requirement of a bright and dark environment.
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 according to a first embodiment of the present invention;
FIG. 2 is a graph showing a field curvature of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a graph showing distortion curves of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph showing axial chromatic aberration of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a graph showing a field curvature of an optical lens according to a second embodiment of the present invention;
FIG. 6 is a graph showing distortion curves of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a graph showing axial chromatic aberration of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a graph showing a field curvature of an optical lens according to a third embodiment of the present invention;
FIG. 9 is a graph showing distortion curves of an optical lens according to a third embodiment of the present invention;
FIG. 10 is a graph showing axial chromatic aberration of an optical lens according to a third embodiment of the present invention;
FIG. 11 is a graph showing a field curvature of an optical lens according to a fourth embodiment of the present invention;
FIG. 12 is a graph showing distortion curves of an optical lens according to a fourth embodiment of the present invention;
fig. 13 is an axial chromatic aberration diagram of an optical lens according to a fourth embodiment of the present invention.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
In this context, near the optical axis means the area near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region.
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, the term "exemplary" is intended to mean exemplary or illustrative.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention provides an optical lens, which consists of eight lenses, and comprises the following components in order from an object side to an imaging surface along an optical axis: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens.
The first lens has positive focal power, the object side surface is a convex surface, and the image side surface is a concave surface.
The second lens has negative focal power, the object side surface is a convex surface, and the image side surface is a concave surface.
The third lens element has positive refractive power, wherein an object-side surface thereof is convex at a paraxial region and an image-side surface thereof is concave at the paraxial region.
The fourth lens element has negative refractive power, wherein an object-side surface thereof is convex at a paraxial region and an image-side surface thereof is concave at the paraxial region.
The fifth lens element has positive refractive power, wherein an object-side surface thereof is convex at a paraxial region and an image-side surface thereof is concave at the paraxial region.
The sixth lens element has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex.
The seventh lens element has positive refractive power, wherein an object-side surface thereof is convex at a paraxial region and an image-side surface thereof is concave at the paraxial region.
The eighth lens element has negative refractive power, wherein an object-side surface thereof is concave at a paraxial region thereof and an image-side surface thereof is concave at the paraxial region thereof.
The optical lens further comprises a diaphragm, wherein the diaphragm is used for limiting the light entering quantity so as to change the brightness of imaging. When the diaphragm is positioned at the forefront end of the optical system, the propagation direction of light can be controlled, the scattering and interference of the light are avoided, the light is ensured to propagate according to the design requirement, and therefore the definition and resolution of imaging are improved. Specifically, the aperture is located in front of the object side surface of the first lens, so that the incident angle and the light intensity distribution of light entering the system can be reasonably controlled, and uniform and centralized control of the light is better realized, and the brightness and the contrast ratio of the optical system are improved.
In some embodiments, the optical lens satisfies the following conditional expression: 1.1< TTL/f <1.2, wherein TTL represents the total optical length of the optical lens, and f represents the effective focal length of the optical lens. The light source device meets the conditions, is favorable for realizing miniaturization of the lens, can increase the pixel spot size under the same pixel, improves the efficiency of collecting light energy by the chip on the optical lens, and realizes high-pixel imaging.
In some embodiments, the optical lens satisfies the following conditional expression: -0.5< f3/f4< -0.05, wherein f3 represents the focal length of the third lens and f4 represents the focal length of the fourth lens. The lens has the advantages that the focal length ratio of the third lens and the fourth lens is reasonably distributed, so that negative spherical aberration generated by the third lens (positive lens) and positive spherical aberration generated by the fourth lens (negative lens) are balanced, the imaging quality of the optical lens is improved, meanwhile, the light trend can be reasonably controlled, and the problem of overhigh lens sensitivity caused by overlarge light deflection degree is avoided.
In some embodiments, the optical lens satisfies the following conditional expression: 0.5< TTL/IH <0.63,1.9< IH/f <2.0, wherein TTL represents the total optical length of the optical lens, IH represents the image height corresponding to the maximum field angle of the optical lens, and f represents the effective focal length of the optical lens. The imaging method has the advantages that the conditions are met, the large target surface imaging of the lens can be better realized, and therefore, an image sensor with a larger size can be matched, and the imaging effect is improved; meanwhile, the optical total length of the optical system can be effectively compressed, the miniaturization design of the system is realized, and the miniaturization of the lens and the reasonable balance of high pixels are better realized.
In some embodiments, the optical lens satisfies the following conditional expression: 0.8< f1/f <1.1,0.2< R1/R2<0.5, wherein f1 represents a focal length of the first lens, f represents an effective focal length of the optical lens, R1 represents a radius of curvature of an object side surface of the first lens, and R2 represents a radius of curvature of an image side surface of the first lens. The first lens element with a positive refractive power can be used for converging light rays with a large angle of view, so that the light quantity can be increased, and the requirements of a large wide angle and a large aperture of the lens element can be met.
In some embodiments, the optical lens satisfies the following conditional expression: -0.3< f1/f2< -0.2, -5< f2/f < -3, wherein f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f represents the effective focal length of the optical lens. The lens has the advantages that the focal length relation of the first lens and the second lens is reasonably set, so that light distribution is regulated, light is gentle when passing through a front end system of the lens, control of lens distortion is facilitated, and the lens has a wide viewing angle and small distortion.
In some embodiments, the optical lens satisfies the following conditional expression: 4< f3/f <8,0.2< R5/R6<0.8, wherein f3 represents a focal length of the third lens, f represents an effective focal length of the optical lens, R5 represents a radius of curvature of an object side surface of the third lens, and R6 represents a radius of curvature of an image side surface of the third lens. The lens has the advantages that the focal length and the surface shape of the third lens are reasonably set, so that the third lens can bear reasonable positive focal power, the deflection degree of light passing through the lens can be alleviated, the field curvature and the distortion of the system are effectively reduced, and the imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression: -60< f4/f < -10,1< R7/R8<2, wherein f4 represents a focal length of the fourth lens, f represents an effective focal length of the optical lens, R7 represents a radius of curvature of an object side of the fourth lens, and R8 represents a radius of curvature of an image side of the fourth lens. The fourth lens element with smaller negative refractive power can further converge incident light rays, thereby being beneficial to correcting the aberration of the off-axis view field of the system, reducing the correction difficulty of the aberration and improving the high-quality imaging of the system.
In some embodiments, the optical lens satisfies the following conditional expression: 10< f5/f <60,0.2< R9/R10<1, where f5 denotes a focal length of the fifth lens, f denotes an effective focal length of the optical lens, R9 denotes a radius of curvature of an object side surface of the fifth lens, and R10 denotes a radius of curvature of an image side surface of the fifth lens. The fifth lens element with smaller positive refractive power can better correct chromatic aberration of the system and improve the overall imaging quality when being matched with the fourth lens element.
In some embodiments, the optical lens satisfies the following conditional expression: 1< f6/f <2,1.5< R11/R12<4, wherein f6 represents a focal length of the sixth lens, f represents an effective focal length of the optical lens, R11 represents a radius of curvature of an object side surface of the sixth lens, and R12 represents a radius of curvature of an image side surface of the sixth lens. The optical power and the surface shape of the sixth lens are reasonably adjusted to be favorable for reducing stray light, meanwhile, the aberration of the marginal view field is effectively improved, the correction difficulty of curvature of field and distortion is reduced, and the overall imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression: 45< f7/f <120,0.5< R13/R14<1.5, wherein f7 represents a focal length of the seventh lens, f represents an effective focal length of the optical lens, R13 represents a radius of curvature of an object side surface of the seventh lens, and R14 represents a radius of curvature of an image side surface of the seventh lens. The seventh lens element with smaller positive refractive power can properly converge light rays, which is beneficial to balancing aberration caused by the front lens group and improving high-quality imaging of the lens.
In some embodiments, the optical lens satisfies the following conditional expression: -1< f8/f < -0.5, -2< R15/R16< -0.5, wherein f8 represents a focal length of the eighth lens, f represents an effective focal length of the optical lens, R15 represents a radius of curvature of an object side of the eighth lens, and R16 represents a radius of curvature of an image side of the eighth lens. The lens has the advantages that the focal length and the surface shape of the eighth lens are reasonably set, so that the eighth lens can have enough refractive power to correct light aberration, the resolution of the lens is improved under the condition of smaller total length, meanwhile, the incident angle of light entering an image surface can be increased, the imaging of a large target surface of the lens is realized, and the imaging of a high pixel of the lens can be better matched with a large-size chip.
In some embodiments, the optical lens satisfies the following conditional expression: 45 ° < FOV/f# <55 °, wherein FOV represents the maximum field angle of the optical lens and f# represents the aperture value of the optical lens. The above conditions are satisfied, which is advantageous to expand the angle of view of the optical lens and increase the aperture of the optical lens, realizing the characteristics of wide angle and large aperture. The realization of the wide-angle characteristic is favorable for the optical lens to acquire more scene information, meets the requirement of large-range detection, and is favorable for improving the problem of rapid decrease of the relative brightness of the edge view field caused by the wide angle, thereby being favorable for acquiring more scene information.
In some embodiments, the optical lens satisfies the following conditional expression: 2< f7/f5<4, wherein f5 represents a focal length of the fifth lens and f7 represents a focal length of the seventh lens. The fifth lens and the seventh lens have proper positive focal power, which is beneficial to light transition and enlarges imaging target surface, thereby improving imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: 2.5< CT1/CT2<3.5, wherein CT1 represents the center thickness of the first lens and CT2 represents the center thickness of the second lens. The thickness of the first lens and the thickness of the second lens are reasonably set, so that light distribution can be regulated, light can pass through the lens more smoothly, control of lens distortion can be facilitated, and the lens has a wide viewing angle and small distortion.
In some embodiments, the optical lens satisfies the following conditional expression: 3< IH/EPD <3.5, wherein IH represents the image height corresponding to the maximum field angle of the optical lens, and EPD represents the entrance pupil diameter of the optical lens. The above conditional expression is satisfied, so that the light beam incident by the optical lens in each view field is as wide as possible, the absolute illuminance of the optical lens on the image surface is improved to avoid generating dark angles, and the imaging target surface of the optical lens can be effectively enlarged.
In some embodiments, the optical lens satisfies the following conditional expression: 8.5mm < TTL <11mm,7mm < F <10mm,80 DEG < FOV <100 DEG, 14mm < IH <18mm, F# <1.8, wherein TTL represents the total optical length of the optical lens, F represents the effective focal length of the optical lens, FOV represents the maximum field angle of the optical lens, IH represents the image height corresponding to the maximum field angle of the optical lens, and F# represents the aperture value of the optical lens. The optical lens provided by the invention has the characteristics of larger field angle, larger image plane, large aperture and miniaturization.
As an implementation mode, the eight plastic lenses are combined, and the focal power of each lens is reasonably distributed and the aspheric surface shape is optimized, so that the optical lens has the advantages of high pixels, wide angle, large aperture, large image plane, low sensitivity and miniaturization. Specifically, the first lens to the eighth lens can all adopt plastic aspherical lenses, and the aspherical lenses can effectively correct aberration, so that imaging quality is improved, and cost performance of products is improved.
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.
In various embodiments of the present invention, when an aspherical lens is used as the lens, the surface shape of the aspherical lens satisfies the following equation:
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h along the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient conic, A 2i The aspherical surface profile coefficient of the 2 i-th order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S19 along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, and filter G1.
The first lens element L1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave.
The second lens element L2 has negative refractive power, wherein an object-side surface S3 of the second lens element is convex, and an image-side surface S4 of the second lens element is concave.
The third lens element L3 has positive refractive power, wherein an object-side surface S5 of the third lens element is convex at a paraxial region thereof and an image-side surface S6 of the third lens element is concave at a paraxial region thereof.
The fourth lens element L4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex at a paraxial region thereof and an image-side surface S8 of the fourth lens element is concave at a paraxial region thereof.
The fifth lens element L5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is convex at a paraxial region thereof and an image-side surface S10 of the fifth lens element is concave at a paraxial region thereof.
The sixth lens L6 has positive optical power, the object-side surface S11 of the sixth lens is concave, and the image-side surface S12 of the sixth lens is convex.
The seventh lens L7 has positive optical power, an object-side surface S13 of the seventh lens is convex at a paraxial region, and an image-side surface S14 of the seventh lens is concave.
The eighth lens element L8 has negative refractive power, wherein an object-side surface S15 of the eighth lens element is concave at a paraxial region thereof, and an image-side surface S16 of the eighth lens element is concave at a paraxial region thereof.
The object side surface S17 and the image side surface S18 of the filter G1 are both planes.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are all plastic aspherical lenses.
Specifically, the design parameters of each lens of the optical lens 100 provided in the present embodiment are shown in table 1.
TABLE 1
The surface profile coefficients of the aspherical surfaces of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
In the present embodiment, graphs of curvature of field, distortion and axial chromatic aberration of the optical lens 100 are shown in fig. 2, 3 and 4, respectively.
In fig. 2, a field Qu Quxian indicates a field curvature of different image heights in the meridian direction and the sagittal direction, and an abscissa indicates an offset (unit: mm) and an ordinate indicates a field angle (unit: degree). As can be seen from the figure, the curvature of field offset in both the meridian direction and the sagittal direction at the image plane is controlled within ±0.06 millimeters, indicating that the curvature of field of the optical lens 100 is well corrected.
The distortion curves in fig. 3 represent the corresponding F-Tan (θ) distortions at different fields of view on the image plane, with the abscissa representing the magnitude of the distortion and the ordinate representing the angle of view (in degrees). As can be seen from the figure, the distortion of the lens is controlled within ±2.4% within the full field of view of the lens, indicating that the distortion of the optical lens 100 is well corrected.
The axial chromatic aberration curve in fig. 4 shows the aberration on the optical axis at the imaging plane, the abscissa in the figure shows the offset (unit: mm), and the ordinate shows the normalized pupil radius, and it is understood from the figure that the axial chromatic aberration of the shortest wavelength and the maximum wavelength is controlled within ±0.07 mm, indicating that the axial chromatic aberration of the optical lens 100 is well corrected.
Second embodiment
The optical lens provided in the second embodiment of the present invention is substantially the same as the optical lens 100 in the first embodiment described above, and is different mainly in the radius of curvature, aspherical coefficient, and thickness of each lens face.
Specifically, the design parameters of the optical lens provided in this embodiment are shown in table 3.
TABLE 3 Table 3
The surface form coefficients of the aspherical surfaces of the optical lens in this example are shown in table 4.
TABLE 4 Table 4
Referring to fig. 5, 6 and 7, graphs of curvature of field, distortion and axial chromatic aberration of the optical lens in the present embodiment are shown, and it can be seen from fig. 5 that curvature of field is controlled within ±0.3mm, which indicates that curvature of field of the optical lens in the present embodiment is better; as can be seen from fig. 6, the optical distortion is controlled within ±2.4%, which indicates that the distortion of the optical lens in this embodiment is well corrected; as can be seen from fig. 7, the axial chromatic aberration at different wavelengths is controlled within ±0.07 mm, which indicates that the chromatic aberration of the optical lens in this embodiment is well corrected; as can be seen from fig. 5, 6 and 7, the optical lens in the present embodiment has good optical imaging quality.
Third embodiment
The optical lens provided in the third embodiment of the present invention is substantially the same as the optical lens 100 in the first embodiment described above, except that the radius of curvature, aspherical coefficient, and thickness of each lens face are different.
Specifically, the design parameters of the optical lens provided in this embodiment are shown in table 5.
TABLE 5
The surface form coefficients of the aspherical surfaces of the optical lens in this example are shown in table 6.
TABLE 6
Referring to fig. 8, 9 and 10, graphs of curvature of field, distortion and axial chromatic aberration of the optical lens in the present embodiment are shown, and as can be seen from fig. 8, curvature of field is controlled within ±0.08mm, which indicates that curvature of field of the optical lens in the present embodiment is better; as can be seen from fig. 9, the optical distortion is controlled within ±2.4%, which indicates that the distortion of the optical lens in this embodiment is well corrected; as can be seen from fig. 10, the axial chromatic aberration at different wavelengths is controlled within ±0.07 mm, which indicates that the chromatic aberration of the optical lens in this embodiment is well corrected; as can be seen from fig. 8, 9 and 10, the optical lens in the present embodiment has good optical imaging quality.
Fourth embodiment
The optical lens provided in the fourth embodiment of the present invention is substantially the same in structure as the optical lens 100 in the first embodiment described above, except that the radius of curvature, aspherical coefficient, thickness of each lens face are different.
The relevant parameters of each lens in the optical lens provided in this embodiment are shown in table 7.
TABLE 7
The surface form coefficients of the aspherical surfaces of the optical lens in this example are shown in table 8.
TABLE 8
Referring to fig. 11, 12 and 13, there are shown graphs of distortion, curvature of field and axial chromatic aberration of the optical lens in the present embodiment, and as can be seen from fig. 11, curvature of field is controlled within ±0.16mm, which indicates that curvature of field of the optical lens in the present embodiment is better; as can be seen from fig. 12, the optical distortion is controlled within ±2.4%, which indicates that the distortion of the optical lens in this embodiment is well corrected; as can be seen from fig. 13, the axial chromatic aberration at different wavelengths is controlled within ±0.07 mm, which indicates that the chromatic aberration of the optical lens in this embodiment is well corrected; as can be seen from fig. 11, 12 and 13, the optical lens in the present embodiment has good optical imaging quality.
Referring to table 9, the optical characteristics of the optical lens provided in the above four embodiments respectively include an effective focal length F, an optical total length TTL, a maximum field angle FOV, an image height IH corresponding to the maximum field angle, an aperture value f#, and a correlation value corresponding to each of the foregoing conditional expressions.
TABLE 9
In summary, the optical lens provided in the present embodiment has at least the following advantages:
(1) The lens surface type and focal power of the optical lens provided by the invention are reasonable, so that the lens has a larger angle of view and smaller distortion, the optical distortion of the lens can be controlled within +/-2.5%, the depth of field can be reduced, the resolution of the lens and the image detail reduction degree can be improved, the resolution of the lens can be improved, and the requirements of large wide angle, small distortion and high definition imaging can be better met.
(2) The optical lens provided by the invention adopts eight lenses with specific focal power, and the lens has the characteristics of large target surface and high pixels through specific surface shape collocation and reasonable focal power distribution, so that the resolution of the lens and the degree of image detail reduction can be improved, and the resolution of the lens can be improved.
(3) The optical lens provided by the invention has the characteristics of large aperture through reasonable collocation of focal power and surface type of each lens, effectively increases the luminous flux entering the lens, reduces the influence of noise generated when light is insufficient on an imaging picture, and ensures that the lens still has excellent imaging effect in dark and dark night environment, thereby meeting the imaging requirement of bright and dark environment.
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 above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present 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 the invention should be assessed as that of the appended claims.
Claims (11)
1. An optical lens comprising eight lenses, comprising, in order from an object side to an imaging plane along an optical axis:
the first lens with positive focal power has a convex object side surface and a concave image side surface;
a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a third lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a fourth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a fifth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a sixth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
a seventh lens element with positive refractive power having an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region;
an eighth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
wherein, the optical lens satisfies the conditional expression: 1.1< TTL/f <1.2, -0.35< f3/f4< -0.05, TTL representing the total optical length of the optical lens, f representing the effective focal length of the optical lens, f3 representing the focal length of the third lens, and f4 representing the focal length of the fourth lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.5< TTL/IH <0.63,1.9< IH/f <2.0, wherein TTL represents the total optical length of the optical lens, IH represents the image height corresponding to the maximum field angle of the optical lens, and f represents the effective focal length of the optical lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -0.3< f1/f2< -0.2, -5< f2/f < -3, wherein f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f represents the effective focal length of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 4< f3/f <8,0.2< R5/R6<0.8, wherein f3 represents a focal length of the third lens, f represents an effective focal length of the optical lens, R5 represents a radius of curvature of an object side surface of the third lens, and R6 represents a radius of curvature of an image side surface of the third lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -60< f4/f < -10,1< R7/R8<2, wherein f4 represents a focal length of the fourth lens, f represents an effective focal length of the optical lens, R7 represents a radius of curvature of an object side of the fourth lens, and R8 represents a radius of curvature of an image side of the fourth lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 10< f5/f <60,0.2< R9/R10<1, where f5 denotes a focal length of the fifth lens, f denotes an effective focal length of the optical lens, R9 denotes a radius of curvature of an object side surface of the fifth lens, and R10 denotes a radius of curvature of an image side surface of the fifth lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 1< f6/f <2,1.5< R11/R12<4, wherein f6 represents a focal length of the sixth lens, f represents an effective focal length of the optical lens, R11 represents a radius of curvature of an object side surface of the sixth lens, and R12 represents a radius of curvature of an image side surface of the sixth lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 45< f7/f <120,0.5< R13/R14<1.5, wherein f7 represents a focal length of the seventh lens, f represents an effective focal length of the optical lens, R13 represents a radius of curvature of an object side surface of the seventh lens, and R14 represents a radius of curvature of an image side surface of the seventh lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -1< f8/f < -0.5, -2< R15/R16< -0.5, wherein f8 represents a focal length of the eighth lens, f represents an effective focal length of the optical lens, R15 represents a radius of curvature of an object side of the eighth lens, and R16 represents a radius of curvature of an image side of the eighth lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 2< f7/f5<4, wherein f5 represents a focal length of the fifth lens and f7 represents a focal length of the seventh lens.
11. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 45 ° < FOV/f# <55 °, wherein FOV represents the maximum field angle of the optical lens and f# represents the aperture value of the optical lens.
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