CN117389016A - Optical lens - Google Patents
Optical lens Download PDFInfo
- Publication number
- CN117389016A CN117389016A CN202311707759.9A CN202311707759A CN117389016A CN 117389016 A CN117389016 A CN 117389016A CN 202311707759 A CN202311707759 A CN 202311707759A CN 117389016 A CN117389016 A CN 117389016A
- Authority
- CN
- China
- Prior art keywords
- lens
- optical lens
- optical
- focal length
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 205
- 238000003384 imaging method Methods 0.000 claims abstract description 33
- 230000014509 gene expression Effects 0.000 claims description 40
- 230000004075 alteration Effects 0.000 description 43
- 230000002349 favourable effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 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
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000004907 flux 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
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, the object-side surface of which is convex at a paraxial region; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a fifth 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 sixth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a seventh lens with negative focal power, the object side surface of which is a concave surface; 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 wide angle and miniaturization.
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.
Currently, the mainstream trend of the development of portable electronic products is ultra-thin, wide-angle, ultra-high definition imaging, etc., and this trend has put higher demands on optical lenses mounted on the portable electronic products. The pixel point size of the sensor chip is not reduced while the pixel is high, so that the increase of the size of the sensor chip becomes an important development trend of the high pixel. 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, 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 having positive optical power, the object-side surface of which is convex at a paraxial region; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a fifth 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 sixth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a seventh lens with negative focal power, the object side surface of which is a concave surface; 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: 2.5< f7/f8<8, f7 denotes a focal length of the seventh lens, and f8 denotes a focal length of the eighth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 55 ° < FOV/f# <70 °, f# <1.6, wherein FOV represents the maximum field angle of the optical lens, and f# represents the aperture value of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: 1.8< IH/f <1.9, wherein IH represents an image height corresponding to a maximum field angle of the optical lens, and f represents an effective focal length of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: 1.2< TTL/f <1.35, wherein TTL represents the total optical length 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: -6< f2/f < -3.5,1< R3/R4<2.5, wherein f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R3 represents the radius of curvature of the object-side surface of the second lens, and R4 represents the radius of curvature of the image-side surface of the second lens.
In some embodiments, the optical lens satisfies the following conditional expression: 1.5< f3/f <3, -0.2< R5/R6<0.1, 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: f4/f >100,0.7< R7/R8<1.2, wherein f4 represents a focal length of the fourth lens element, f represents an effective focal length of the optical lens element, R7 represents a radius of curvature of an object side surface of the fourth lens element, and R8 represents a radius of curvature of an image side surface of the fourth lens element.
In some embodiments, the optical lens satisfies the following conditional expression: -10< f5/f < -3,1< R9/R10<4, wherein f5 represents a focal length of the fifth lens, f represents an effective focal length of the optical lens, R9 represents a radius of curvature of an object side of the fifth lens, and R10 represents a radius of curvature of an image side of the fifth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 0.5< f6/f <1.5,1< R11/R12<5, wherein f6 represents a focal length of the sixth lens element, f represents an effective focal length of the optical lens element, R11 represents a radius of curvature of an object side surface of the sixth lens element, and R12 represents a radius of curvature of an image side surface of the sixth lens element.
In some embodiments, the optical lens satisfies the following conditional expression: -5< f7/f < -1, wherein f7 represents the focal length of the seventh lens and f represents the effective focal length of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: -1< f8/f < -0.5, -4< R15/R16< -1, 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 surface of the eighth lens, and R16 represents a radius of curvature of an image side surface of the eighth lens.
In some embodiments, the optical lens satisfies the following conditional expression: 0< f3/f4<0.05, wherein f3 represents a focal length of the third lens and f4 represents a focal length of the fourth lens.
Compared with the prior art, the optical lens provided by the invention adopts eight lenses with specific focal power, and the lens has a compact structure through specific surface shape collocation and reasonable focal power distribution, and meanwhile, the lens has the characteristics of large wide angle and small distortion, so that the resolution and the image detail reduction degree of the lens can be improved, and the resolution of the lens is improved; the optical lens also has the characteristic of a large aperture, 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 night environment, 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 distortion curves of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a graph showing a vertical axis chromatic aberration curve 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 distortion curves of an optical lens according to a second embodiment of the present invention;
FIG. 6 is a graph showing a vertical axis chromatic aberration curve 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 distortion curves of an optical lens according to a third embodiment of the present invention;
FIG. 9 is a graph showing a vertical axis chromatic aberration curve 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 distortion curves of an optical lens according to a fourth embodiment of the present invention;
FIG. 12 is a graph showing a vertical axis chromatic aberration curve 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 has positive focal power, and an object side surface of the third lens is convex at a paraxial region.
The fourth lens element has positive refractive power, wherein an object-side surface thereof is concave, and an image-side surface thereof is convex.
The fifth 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 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 has negative focal power, and the object side surface of the seventh lens is concave.
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: 55 ° < FOV/f# <70 °, f# <1.6, 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: 0.65< TTL/IH <0.75,1.8< IH/f <1.9, 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 conditions are met, and the large target surface imaging of the optical lens can be realized, so that 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: 1.2< TTL/f <1.35, wherein TTL represents the total optical length of the optical lens and f represents the effective focal length of the optical lens. The light collecting device meets the conditions, is favorable for realizing miniaturization of the optical lens, can increase the pixel spot size under the same pixel, improves the collection efficiency of the chip on the light of the lens, and realizes high-pixel imaging of the lens.
In some embodiments, the optical lens satisfies the following conditional expression: 0.8< f1/f <1.2,0.2< 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 has larger positive focal power to converge light rays with a large field angle, the light quantity can be increased, and the requirements of a large wide angle and a large aperture of the lens can be met.
In some embodiments, the optical lens satisfies the following conditional expression: -6< f2/f < -3.5,1< R3/R4<2.5, wherein f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R3 represents the radius of curvature of the object-side surface of the second lens, and R4 represents the radius of curvature of the image-side surface of the second lens. The lens has the advantages that the focal length and the surface shape of the second lens are reasonably set, the deflection degree of incident light rays can be slowed down, the view field angle of the system is improved, the distortion correction difficulty of the edge view field is reduced while the view field angle is increased, the lens has smaller distortion, and meanwhile, the spherical aberration generated by the first lens can be effectively balanced, and the overall imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression: 1.5< f3/f <3, -0.2< R5/R6<0.1, 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 third lens can bear reasonable positive focal power, the deflection degree of light passing through the lens can be alleviated, the field curvature and distortion of the system are effectively reduced, and the imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression: f4/f >100,0.7< R7/R8<1.2, wherein f4 represents a focal length of the fourth lens element, f represents an effective focal length of the optical lens element, R7 represents a radius of curvature of an object side surface of the fourth lens element, and R8 represents a radius of curvature of an image side surface of the fourth lens element. The fourth lens has smaller positive focal power, is favorable for smooth transition of light trend and improves imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: -10< f5/f < -3,1< R9/R10<4, wherein f5 represents a focal length of the fifth lens, f represents an effective focal length of the optical lens, R9 represents a radius of curvature of an object side of the fifth lens, and R10 represents a radius of curvature of an image side of the fifth lens. The fifth lens has proper negative focal power, which is beneficial to balancing the off-axis aberration of the optical lens and increasing the imaging area of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression: 0.5< f6/f <1.5,1< R11/R12<5, wherein f6 represents a focal length of the sixth lens element, f represents an effective focal length of the optical lens element, R11 represents a radius of curvature of an object side surface of the sixth lens element, and R12 represents a radius of curvature of an image side surface of the sixth lens element. 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: -5< f7/f < -1, wherein f7 represents the focal length of the seventh lens and f represents the effective focal length of the optical 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: -1< f8/f < -0.5, -4< R15/R16< -1, 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 surface of the eighth lens, and R16 represents a radius of curvature of an image side surface 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 focal power to correct light aberration, the resolution of the lens is improved under the condition of small 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: 2.5< f7/f8<8, wherein f7 represents a focal length of the seventh lens and f8 represents a focal length of the eighth lens. The focal length relation of the last two negative focal power lenses in the system is reasonably set, so that various aberrations of the optical lens are balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression: 0< f3/f4<0.05, wherein f3 represents a focal length of the third lens and f4 represents a 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 the overlarge deflection degree of light rays passing through the system can be avoided, the aberration correction difficulty is reduced, meanwhile, the field curvature and distortion of the lens can be better corrected, the field curvature and distortion of the lens are ensured to be controlled at smaller levels, and the high-pixel imaging of the system is realized.
In some embodiments, the optical lens satisfies the following conditional expression: 3.5< CT1/CT2<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 to be excessively gentle, 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: 8mm < TTL <10mm,6mm < F <9mm,80 DEG < FOV <100 DEG, 10mm < IH <15mm, F# <1.6, 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.
The optical lens provided by the embodiment has a large number of lenses for correcting aberration, which is beneficial to obtaining better imaging quality. 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 positive refractive power, wherein an object-side surface S7 of the fourth lens element is concave, and an image-side surface S8 of the fourth lens element is convex.
The fifth lens element L5 has negative 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 negative power, the object-side surface S13 of the seventh lens is concave, and the image-side surface S14 of the seventh lens is convex.
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 distortion, chromatic aberration on the vertical axis, and chromatic aberration on the axial direction of the optical lens 100 are shown in fig. 2, 3, and 4, respectively.
The distortion curves in FIG. 2 represent F-Tan (θ) distortions corresponding to 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 ±2.6% within the full field of view of the lens, indicating that the distortion of the optical lens 100 is well corrected.
The vertical axis chromatic aberration curves in fig. 3 show chromatic aberration of different image heights of each wavelength with respect to the center wavelength on the image plane, the horizontal axis in the figure shows the vertical axis chromatic aberration value (unit: micrometers) of each wavelength with respect to the center wavelength, and the vertical axis shows the normalized field angle, and it is known that the chromatic aberration of each wavelength with respect to the center wavelength is controlled within ±2 micrometers in different fields of view, which means that the vertical axis chromatic aberration 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 ±0.06 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 has substantially the same structure as the optical lens 100 in the first embodiment, and is mainly different in that the image side surface S14 of the seventh lens element is concave at the paraxial region, and the radius of curvature, aspherical coefficient, and thickness of each lens element surface are different.
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, fig. 6, and fig. 7, which are graphs of distortion, vertical chromatic aberration, and axial chromatic aberration of the optical lens in the present embodiment, it can be seen from fig. 5 that the optical distortion is controlled within ±2.6%, which illustrates that the distortion of the optical lens in the present embodiment is well corrected; it can be seen from fig. 6 that the vertical chromatic aberration at different wavelengths is controlled within ±1.5 microns, and from fig. 7 that the axial chromatic aberration at different wavelengths is controlled within ±0.07 millimeters, 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 has substantially the same structure as the optical lens 100 in the first embodiment, except that the image side surface S6 of the third lens element is convex, the image side surface S14 of the seventh lens element is concave at a paraxial region, and the curvature radius, aspheric coefficients, and thicknesses of the lens surfaces 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 distortion, vertical chromatic aberration and axial chromatic aberration of the optical lens in the present embodiment are shown, and it can be seen from fig. 8 that the optical distortion is controlled within ±2.6%, which indicates that the distortion of the optical lens in the present embodiment is well corrected; it can be seen from fig. 9 that the vertical chromatic aberration at different wavelengths is controlled within ±1.5 microns, and from fig. 10 that the axial chromatic aberration at different wavelengths is controlled within ±0.07 millimeters, 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 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.
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, graphs of distortion, vertical chromatic aberration and axial chromatic aberration of the optical lens in the present embodiment are shown, and it can be seen from fig. 11 that the optical distortion is controlled within ±2.6%, which indicates that the distortion of the optical lens in the present embodiment is well corrected; as can be seen from fig. 12, the vertical chromatic aberration at different wavelengths is controlled within ±2.5 microns, and as can be seen from fig. 13, the axial chromatic aberration at different wavelengths is controlled within ±0.06 millimeters, 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 +/-2.6%, 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 (12)
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 having positive optical power, the object-side surface of which is convex at a paraxial region;
a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
a fifth 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 sixth lens element with positive refractive power having a concave object-side surface and a convex image-side surface;
a seventh lens with negative focal power, the object side surface of which is a concave surface;
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: 2.5< f7/f8<8, f7 denotes a focal length of the seventh lens, and f8 denotes a focal length of the eighth lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 55 ° < FOV/f# <70 °, f# <1.6, wherein FOV represents the maximum field angle of the optical lens, and f# represents the aperture value of the optical lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 1.8< IH/f <1.9, wherein IH represents an image height corresponding to a maximum field angle of the optical lens, and f represents an effective focal length of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 1.2< TTL/f <1.35, wherein TTL represents the total optical length of the optical lens and f represents the effective focal length of the optical lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -6< f2/f < -3.5,1< R3/R4<2.5, wherein f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R3 represents the radius of curvature of the object-side surface of the second lens, and R4 represents the radius of curvature of the image-side surface of the second lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 1.5< f3/f <3, -0.2< R5/R6<0.1, 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.
7. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: f4/f >100,0.7< R7/R8<1.2, wherein f4 represents a focal length of the fourth lens element, f represents an effective focal length of the optical lens element, R7 represents a radius of curvature of an object side surface of the fourth lens element, and R8 represents a radius of curvature of an image side surface of the fourth lens element.
8. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -10< f5/f < -3,1< R9/R10<4, wherein f5 represents a focal length of the fifth lens, f represents an effective focal length of the optical lens, R9 represents a radius of curvature of an object side of the fifth lens, and R10 represents a radius of curvature of an image side of the fifth lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0.5< f6/f <1.5,1< R11/R12<5, wherein f6 represents a focal length of the sixth lens element, f represents an effective focal length of the optical lens element, R11 represents a radius of curvature of an object side surface of the sixth lens element, and R12 represents a radius of curvature of an image side surface of the sixth lens element.
10. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -5< f7/f < -1, wherein f7 represents the focal length of the seventh lens and f represents the effective focal length of the optical lens.
11. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: -1< f8/f < -0.5, -4< R15/R16< -1, 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 surface of the eighth lens, and R16 represents a radius of curvature of an image side surface of the eighth lens.
12. The optical lens according to claim 1, wherein the optical lens satisfies a conditional expression: 0< f3/f4<0.05, wherein f3 represents a focal length of the third lens and f4 represents a focal length of the fourth lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311707759.9A CN117389016B (en) | 2023-12-13 | 2023-12-13 | Optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311707759.9A CN117389016B (en) | 2023-12-13 | 2023-12-13 | Optical lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117389016A true CN117389016A (en) | 2024-01-12 |
| CN117389016B CN117389016B (en) | 2024-03-26 |
Family
ID=89439597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311707759.9A Active CN117389016B (en) | 2023-12-13 | 2023-12-13 | Optical lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117389016B (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965799A (en) * | 2020-10-21 | 2020-11-20 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN112327456A (en) * | 2020-11-24 | 2021-02-05 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| US20210149158A1 (en) * | 2019-11-15 | 2021-05-20 | Largan Precision Co., Ltd. | Photographing lens assembly, image capturing unit and electronic device |
| US20210173183A1 (en) * | 2017-11-22 | 2021-06-10 | Zhejiang Sunny Optical, Co., Ltd | Optical Imaging Lens |
| CN213690082U (en) * | 2020-11-24 | 2021-07-13 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN113156618A (en) * | 2021-04-29 | 2021-07-23 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN214151197U (en) * | 2020-11-30 | 2021-09-07 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN114137694A (en) * | 2017-11-22 | 2022-03-04 | 浙江舜宇光学有限公司 | Optical imaging lens |
| WO2022052018A1 (en) * | 2020-09-11 | 2022-03-17 | 欧菲光集团股份有限公司 | Optical system, camera module, and electronic device |
| US20220121010A1 (en) * | 2020-10-21 | 2022-04-21 | Changzhou Raytech Optronics Co., Ltd. | Camera optical lens |
| US20220155562A1 (en) * | 2019-08-15 | 2022-05-19 | Jiangxi Jingchao Optical Co., Ltd. | Optical system, image capturing module and electronic device |
| CN114578530A (en) * | 2022-05-06 | 2022-06-03 | 江西联益光学有限公司 | Optical lens |
| CN114690382A (en) * | 2022-06-01 | 2022-07-01 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN115390225A (en) * | 2022-10-28 | 2022-11-25 | 江西联益光学有限公司 | Optical lens |
| CN115390223A (en) * | 2022-09-01 | 2022-11-25 | Oppo广东移动通信有限公司 | Optical system, lens module and terminal equipment |
| US20230068322A1 (en) * | 2021-08-04 | 2023-03-02 | Samsung Electro-Mechanics Co., Ltd | Optical imaging system |
| CN116088154A (en) * | 2021-10-29 | 2023-05-09 | 荣耀终端有限公司 | Zoom lens, lens module and electronic equipment |
| US20230168467A1 (en) * | 2021-11-26 | 2023-06-01 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
-
2023
- 2023-12-13 CN CN202311707759.9A patent/CN117389016B/en active Active
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137694A (en) * | 2017-11-22 | 2022-03-04 | 浙江舜宇光学有限公司 | Optical imaging lens |
| US20210173183A1 (en) * | 2017-11-22 | 2021-06-10 | Zhejiang Sunny Optical, Co., Ltd | Optical Imaging Lens |
| US20220155562A1 (en) * | 2019-08-15 | 2022-05-19 | Jiangxi Jingchao Optical Co., Ltd. | Optical system, image capturing module and electronic device |
| US20210149158A1 (en) * | 2019-11-15 | 2021-05-20 | Largan Precision Co., Ltd. | Photographing lens assembly, image capturing unit and electronic device |
| WO2022052018A1 (en) * | 2020-09-11 | 2022-03-17 | 欧菲光集团股份有限公司 | Optical system, camera module, and electronic device |
| CN111965799A (en) * | 2020-10-21 | 2020-11-20 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| US20220121010A1 (en) * | 2020-10-21 | 2022-04-21 | Changzhou Raytech Optronics Co., Ltd. | Camera optical lens |
| CN213690082U (en) * | 2020-11-24 | 2021-07-13 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN112327456A (en) * | 2020-11-24 | 2021-02-05 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN214151197U (en) * | 2020-11-30 | 2021-09-07 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| CN113156618A (en) * | 2021-04-29 | 2021-07-23 | 江西晶超光学有限公司 | Optical system, camera module and electronic equipment |
| US20230068322A1 (en) * | 2021-08-04 | 2023-03-02 | Samsung Electro-Mechanics Co., Ltd | Optical imaging system |
| CN116088154A (en) * | 2021-10-29 | 2023-05-09 | 荣耀终端有限公司 | Zoom lens, lens module and electronic equipment |
| US20230168467A1 (en) * | 2021-11-26 | 2023-06-01 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
| CN114578530A (en) * | 2022-05-06 | 2022-06-03 | 江西联益光学有限公司 | Optical lens |
| CN114690382A (en) * | 2022-06-01 | 2022-07-01 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN115390223A (en) * | 2022-09-01 | 2022-11-25 | Oppo广东移动通信有限公司 | Optical system, lens module and terminal equipment |
| CN115390225A (en) * | 2022-10-28 | 2022-11-25 | 江西联益光学有限公司 | Optical lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117389016B (en) | 2024-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116338912B (en) | optical lens | |
| CN114578530B (en) | Optical lens | |
| CN117233932B (en) | Optical lens | |
| CN116500763B (en) | optical lens | |
| CN113703139B (en) | Optical lens and imaging apparatus | |
| CN114326022B (en) | Optical system, camera module and electronic equipment | |
| CN113589495B (en) | External lens | |
| CN117389016B (en) | Optical lens | |
| CN117406399B (en) | Optical lens | |
| CN117406409B (en) | Optical lens | |
| CN116643388B (en) | optical lens | |
| CN116626864B (en) | Optical lens | |
| CN116500766B (en) | Optical lens | |
| CN117289433B (en) | Optical lens and imaging apparatus | |
| CN117872569B (en) | Optical lens | |
| CN116500765B (en) | optical lens | |
| CN116500759B (en) | optical lens | |
| CN116482843B (en) | optical lens | |
| CN116774407B (en) | optical lens | |
| CN114755809B (en) | Optical lens | |
| CN117826377B (en) | Optical lens, optical fingerprint module and electronic equipment | |
| CN117148549B (en) | Optical lens | |
| CN116149030B (en) | optical lens | |
| CN116449546B (en) | optical lens | |
| CN116736493B (en) | Optical lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |