CN115390227B - Optical lens - Google Patents
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- CN115390227B CN115390227B CN202211342049.6A CN202211342049A CN115390227B CN 115390227 B CN115390227 B CN 115390227B CN 202211342049 A CN202211342049 A CN 202211342049A CN 115390227 B CN115390227 B CN 115390227B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The invention discloses an optical lens, which comprises the following components in sequence from an object side to an imaging surface along an optical axis: a diaphragm; the first lens with positive focal power has a convex object-side surface and a concave image-side surface; the image side surface of the second lens is a concave surface; a third lens with negative focal power, the image side surface of which is concave; a fourth lens element with positive focal power, wherein the object-side surface of the fourth lens element is convex and the image-side surface of the fourth lens element is concave; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; the image side surface of the sixth lens is a convex surface; a seventh lens element with negative optical power, having a concave object-side surface and a concave image-side surface at a paraxial region; the effective focal length f of the optical lens and the image height IH corresponding to the maximum half field angle satisfy the conditional expression: 1.5 and < -f/IH <1.8. The optical lens provided by the invention has the advantages of large aperture, long focal length and small depth of field.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the rapid growth of consumer electronics market and the popularity of social, video and live broadcast software, people have higher and higher requirements for the imaging quality of the camera lens, and the camera lens even becomes an index of primary consideration when consumers purchase electronic equipment.
Particularly, with the increasing liveness of people on social networking platforms, higher requirements are put forward on the optical performance of electronic shooting equipment, particularly on the aspect of portrait shooting, the imaging lens is required to be capable of clearly shooting in a dark environment and also capable of clearly imaging in a far environment, and the characteristics of long focal length and small depth of field are required to better realize the functions of blurring a background and highlighting a main body, so that more textured portrait photos are shot. At present, in many imaging lenses, image quality is blurred in environments with poor light conditions such as shooting night scenes or indoors. In addition, most lenses can image a subject well when shooting a close shot, but have poor imaging of a distant target and cannot give consideration to high-pixel distant imaging, and when shooting a distant subject, the problem that the subject cannot be highlighted occurs.
Accordingly, there is a need to develop an optical lens with a large aperture, a long focal length and a small depth of field to meet the shooting requirements of electronic devices.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens having at least advantages of large aperture, long focal length, small depth of field and high pixel.
The embodiment of the invention implements the above object by the following technical scheme.
The invention provides an optical lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis:
a diaphragm;
the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface;
the second lens with negative focal power, the image side surface of the second lens is a concave surface;
a third lens with negative focal power, wherein the image side surface of the third lens is a concave surface;
the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the lens system comprises a fifth lens with positive focal power, a second lens and a third lens, wherein the object-side surface of the fifth lens is a convex surface, and the image-side surface of the fifth lens is a concave surface;
the image side surface of the sixth lens is a convex surface;
a seventh lens having a negative optical power, the seventh lens having a concave object-side surface and a concave image-side surface at a paraxial region;
wherein, the optical lens satisfies the following conditional expression:
1.5<f/IH<1.8；
wherein f represents an effective focal length of the optical lens, and IH represents an image height corresponding to a maximum half field angle of the optical lens.
Compared with the prior art, the optical lens provided by the invention adopts seven lenses with specific focal power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the imaging requirement of high pixels is met under the condition of ensuring that the total length of the lens is not overlong; meanwhile, the optical lens has a longer focal length and a shorter depth of field, so that the background can be better blurred, and the function of a main body is highlighted; the size of the aperture of the lens is reasonably controlled, so that the light inlet quantity of the system can be effectively enlarged, and the lens can achieve a good shooting effect in a dark environment.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention;
FIG. 2 is a field curvature graph of an optical lens according to a first embodiment of the present invention;
fig. 3 is a graph showing F-Tan (θ) distortion of the optical lens according to the first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;
FIG. 6 is a field curvature diagram of an optical lens according to a second embodiment of the present invention;
fig. 7 is a graph showing F-Tan (θ) distortion of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention;
FIG. 10 is a field curvature graph of an optical lens according to a third embodiment of the present invention;
fig. 11 is a graph showing F-Tan (θ) distortion of an optical lens according to a third embodiment of the present invention;
fig. 12 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. 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.
The present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises 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 optical filter.
The first lens has positive focal power, the object-side surface of the first lens is a convex surface, and the image-side surface of the first lens is a concave surface;
the second lens has negative focal power, and the image side surface of the second lens is a concave surface;
the third lens has negative focal power, and the image side surface of the third lens is a concave surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive focal power, and the image side surface of the sixth lens is a convex surface;
the seventh lens element has a negative optical power, the seventh lens element has a concave object-side surface, and the seventh lens element has a concave image-side surface at a paraxial region.
In the optical lens assembly, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element are all plastic aspheric lens elements. The invention has compact structure by reasonably setting the surface type and focal power of each lens, and realizes the characteristics of large aperture, long focal length and high pixel.
The optical lens provided by the embodiment satisfies the following conditional expression:
1.5<f/IH<1.8；（1）
wherein f represents an effective focal length of the optical lens, and IH represents an image height corresponding to a maximum half field angle of the optical lens. Through the combination of the focal power of seven lenses of rational control and face type collocation, satisfy conditional expression (1) simultaneously, can make optical lens has longer focus and shorter depth of field, better virtual background when being favorable to carrying out portrait and shooing, highlights the main part.
In some embodiments, the optical lens satisfies the following conditional expression:
-1<f1/f2<0；（2）
wherein f1 represents an effective focal length of the first lens, and f2 represents an effective focal length of the second lens. The condition formula (2) is met, the long focal length and the high pixel balance of the optical lens are favorably realized by reasonably distributing the focal lengths of the first lens and the second lens, and the total length of the optical lens is favorably shortened.
In some embodiments, the optical lens satisfies the following conditional expression:
0.5<f1/f<1.1；（3）
wherein f1 represents an effective focal length of the first lens. The condition (3) is met, the primary spherical aberration of the system can be effectively corrected by reasonably setting the focal length of the first lens, the machinability of the first lens is improved, and the yield is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.8<f/f2<0；（4）
where f2 denotes an effective focal length of the second lens. The second lens has negative focal power when the conditional expression (4) is satisfied, so that the total optical length of the lens can be shortened, and the miniaturization of the lens is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
-4<f3/f<-0.8；（5）
wherein f3 represents an effective focal length of the third lens. The condition formula (5) is met, the negative refractive power of the third lens is reasonably set, the focal power change in the lens group can be balanced, the aberration correction difficulty is reduced, and the imaging quality of the lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0<f/f4<0.7；（6）
wherein f4 represents an effective focal length of the fourth lens. And the condition formula (6) is met, so that the fourth lens has proper positive focal power, the convergence of light rays is facilitated, the divergent light rays entering the system from the front smoothly enter the rear optical system, the trend of the whole light path is smoother, the aberration is optimized, and the resolution is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.8<f5/f<6；（7）
wherein f5 denotes an effective focal length of the fifth lens. Satisfy conditional expression (7), through the focus of reasonable setting fifth lens, the aberration that the preceding lens group of correction that can be better brought improves senior spherical aberration, coma, is favorable to realizing the uniformity of high resolution and whole resolution.
In some embodiments, the optical lens satisfies the following conditional expression:
0.7<f4/f5<5；（8）
where f4 denotes an effective focal length of the fourth lens, and f5 denotes an effective focal length of the fifth lens. The condition formula (8) is met, and the focal length ratio of the fourth lens and the fifth lens is reasonably controlled, so that the lens has good imaging quality under different wavelengths, and the resolution capability of the lens in a full view field is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.6<f6/f<4；（9）
where f6 denotes an effective focal length of the sixth lens. And the conditional expression (9) is satisfied, so that the sixth lens has proper positive focal power, the correction of the spherical aberration and the coma aberration of the system is facilitated, and the imaging quality is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-1<f7/f<-0.5；（10）
-1<R72/f7<-0.5；（11）
where f7 denotes an effective focal length of the seventh lens, and R72 denotes a radius of curvature of an image-side surface of the seventh lens. The seventh lens has proper negative focal power and surface type when the conditional expressions (10) and (11) are met, so that the imaging area of the lens is increased, the aberration of the front lens is balanced, and the integral imaging quality of the lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<f/EPD<1.8；（12）
wherein EPD represents an entrance pupil diameter of the optical lens. The light-in quantity of the system can be reasonably increased by satisfying the conditional expression (12), the large aperture characteristic of the system is realized, and the good shooting effect of the lens can be realized in a dark environment.
In some embodiments, the optical lens satisfies the following conditional expression:
0.1<R51/R52<1；（13）
wherein R51 denotes a radius of curvature of an object-side surface of the fifth lens, and R52 denotes a radius of curvature of an image-side surface of the fifth lens. And the conditional expression (13) is satisfied, the surface type of the fifth lens can be reasonably controlled, the total length of the optical lens is favorably reduced, the spherical aberration and distortion of the optical lens are favorably corrected, and high-definition imaging of the lens is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.5<DM6/DM7<0.7；（14）
where DM6 denotes an effective diameter of the sixth lens, and DM7 denotes an effective diameter of the seventh lens. The effective diameters of the sixth lens and the seventh lens can be reasonably matched when the conditional expression (14) is met, and the optical lens has a longer focal length.
In some embodiments, the optical lens satisfies the following conditional expression:
0.8<DM11/IH<1.1；（15）
where DM11 denotes an effective diameter of an object-side surface of the first lens, and IH denotes an image height corresponding to a maximum half field angle of the optical lens. Satisfying the conditional expression (15), the front port diameter of the optical lens can be reduced, which is beneficial to realizing the miniaturization of the system.
In some embodiments, the optical lens satisfies the following conditional expression:
30<V4-V5 <35；（16）
30<V6-V5<35；（17）
wherein V4 represents an abbe number of the fourth lens, V5 represents an abbe number of the fifth lens, and V6 represents an abbe number of the sixth lens. The condition formulas (16) and (17) are met, and the materials of the fourth lens, the fifth lens and the sixth lens are reasonably matched, so that the chromatic aberration correction of the optical lens and the improvement of the resolving power are facilitated.
In some embodiments, the optical lens satisfies the following conditional expression:
-5<R71/f<-1；（18）
-8<R71/R72<-1；（19）
where f denotes an effective focal length of the optical lens, R71 denotes a radius of curvature of an object-side surface of the seventh lens, and R72 denotes a radius of curvature of an image-side surface of the seventh lens. The optical lens meets the conditional expressions (18) and (19), and aberrations such as spherical aberration, field curvature, distortion and the like generated by the front lens can be effectively corrected by reasonably setting the surface type of the seventh lens, so that the imaging of the edge can be clearer, and the imaging effect of the optical lens in the full field of view is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.8mm<(R11×IH)/f<2.5mm；（20）
9mm/rad<IH/θ<10mm/rad；（21）
wherein R11 denotes a curvature radius of an object-side surface of the first lens, IH denotes an image height corresponding to a maximum half field angle of the optical lens, f denotes an effective focal length of the optical lens, and θ denotes a maximum half field angle of the optical lens. The optical lens meets the conditional expressions (20) and (21), can reasonably control the focal length and the imaging area of the optical lens, realizes the long-focus characteristic of the lens, has the characteristics of small field angle and short depth of field, and is favorable for better blurring the background and highlighting the main body when long-distance scenery or people are shot.
As an implementation mode, the structure of the seven plastic aspheric lenses is adopted, and the surface type and focal power of each lens are reasonably restricted, so that the structure of the seven plastic aspheric lenses is compact, and the characteristics of large aperture, long focal length and short depth of field are realized. By adopting the aspheric lens, the cost can be effectively reduced, the aberration can be corrected, and a product with higher performance-price ratio can be provided.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
In the embodiments of the present invention, when the lenses in the optical lens are aspheric lenses, the aspheric surface types of the lenses all satisfy the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A 2i The coefficient of the aspheric surface type 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 sequentially includes, from an object side to an image plane S17 along an optical axis: the stop ST, 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 filter G1.
The first lens L1 has positive focal power, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface;
the second lens L2 has negative focal power, the object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a concave surface;
the third lens element L3 has negative optical power, and has a convex object-side surface S5 at paraxial region and a concave image-side surface S6;
the fourth lens L4 has positive focal power, the object-side surface S7 of the fourth lens is a convex surface, and the image-side surface S8 of the fourth lens is a concave surface;
the fifth lens L5 has positive focal power, the object-side surface S9 of the fifth lens is a convex surface, and the image-side surface S10 of the fifth lens is a concave surface;
the sixth lens element L6 has positive refractive power, and has a concave object-side surface S11 and a convex image-side surface S12;
the seventh lens element L7 has a negative optical power, the object-side surface S13 of the seventh lens element is concave, and the image-side surface S14 of the seventh lens element is concave at the paraxial region;
the object side surface of the filter G1 is S15, and the image side surface is S16.
The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6 and the seventh lens element L7 are all plastic aspheric lenses.
Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
In this embodiment, aspheric parameters of each lens in the optical lens 100 are shown in table 2.
TABLE 2
In the present embodiment, graphs of field curvature, F-Tan (θ) distortion, and homeotropic chromatic aberration of the optical lens 100 are shown in fig. 2, 3, and 4, respectively.
The field curvature curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane. In fig. 2, the horizontal axis represents the offset amount (unit: mm) and the vertical axis represents the angle of view (unit: degree). It can be seen from fig. 2 that the field curvature of the image plane in two directions is controlled within ± 0.05 mm, which indicates that the field curvature correction of the optical lens 100 is good.
The distortion curve of fig. 3 represents the F-Tan (θ) distortion at different image heights on the image plane. In fig. 3, the horizontal axis represents the distortion percentage, and the vertical axis represents the angle of view (unit: degree). It can be seen from the figure that the optical distortion is controlled within ± 2%, which indicates that the distortion of the optical lens 100 is well corrected.
The vertical axis chromatic aberration curve of fig. 4 shows chromatic aberration at different image heights on the image plane for each wavelength with respect to the center wavelength (0.555 um). In fig. 4, the horizontal axis represents the homeotropic color difference (unit: μm) of each wavelength with respect to the center wavelength, and the vertical axis represents the normalized angle of view. As can be seen from fig. 4, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.2 microns, which indicates that the optical lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
As can be seen from fig. 2, 3, and 4, the aberrations of the optical lens 100 are well balanced, and the optical imaging quality is good.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is shown, where the optical lens 200 of the present embodiment is substantially the same as the first embodiment, and the difference is mainly that: the object side surface S3 of the second lens element is concave at paraxial region, and the curvature radius, aspheric coefficient, and thickness of each lens element are different.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3
In this embodiment, aspheric parameters of each lens in the optical lens 200 are shown in table 4.
TABLE 4
Referring to fig. 6, 7 and 8, a field curvature graph, an F-Tan (θ) distortion graph and a vertical axis chromatic aberration graph of the optical lens 200 are shown.
As can be seen from fig. 6, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1 mm, which indicates that the field curvature correction of the optical lens 200 is good.
It can be seen from fig. 7 that the optical distortion is controlled within ± 2%, indicating that the distortion of the optical lens 200 is well corrected.
As can be seen from fig. 8, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.7 microns, which indicates that the optical lens 200 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
As can be seen from fig. 6, 7, and 8, the aberrations of the optical lens 200 are well balanced, and the optical imaging quality is good.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention is shown, where the optical lens 300 of the present embodiment is substantially the same as the first embodiment, and the difference is mainly that: the object-side surface S3 of the second lens element is concave at the paraxial region, the object-side surface S5 of the third lens element is concave at the paraxial region, and the object-side surface S11 of the sixth lens element is concave at the paraxial region, and the respective lens element surfaces have different radii of curvature, aspherical coefficients, and thicknesses.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
In the present embodiment, aspheric parameters of each lens in the optical lens 300 are shown in table 6.
TABLE 6
Referring to fig. 10, 11 and 12, a field curvature graph, an F-Tan (θ) distortion graph and a vertical axis chromatic aberration graph of the optical lens 300 are respectively shown.
Fig. 10 shows that the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.05 mm, which indicates that the field curvature correction of the optical lens 300 is good.
It can be seen from fig. 11 that the optical distortion is controlled within ± 2%, indicating that the distortion of the optical lens 300 is well corrected.
As can be seen from fig. 12, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.15 microns, which indicates that the optical lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
As can be seen from fig. 10, 11, and 12, the aberrations of the optical lens 300 are well balanced, and the optical imaging quality is good.
Please refer to table 7, which shows the optical characteristics corresponding to the optical lens provided in the above three embodiments, including the effective focal length f, the total optical length TTL, the maximum field angle FOV, the image height IH corresponding to the maximum half field angle, the entrance pupil diameter EPD, and the related values corresponding to each of the aforementioned conditional expressions.
TABLE 7
In summary, the optical lens provided by the invention has at least the following advantages:
(1) The seven aspheric lenses with specific focal power are adopted, and the distortion, chromatic aberration and aberration of the lens can be better corrected through specific surface shape matching, so that the lens has higher imaging quality.
(2) Because the focal power and the surface type of each lens are reasonably arranged, the optical lens has a longer focal length and a shorter depth of field, and can better realize the functions of blurring the background and highlighting the main body.
(3) The size of the aperture of the lens is reasonably controlled, so that the light inlet quantity of the system can be effectively enlarged, and the lens can achieve a good shooting effect in a dark environment.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. An optical lens, comprising, in order from an object side to an image plane along an optical axis:
a diaphragm;
the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens with negative focal power, the image side surface of the second lens is a concave surface;
a third lens with negative focal power, wherein the image side surface of the third lens is a concave surface;
the fourth lens is provided with positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;
the lens comprises a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
the image side surface of the sixth lens is a convex surface;
a seventh lens having a negative optical power, an object side surface of the seventh lens being concave, an image side surface of the seventh lens being concave at a paraxial region;
wherein, the optical lens satisfies the following conditional expression:
1.5<f/IH<1.8；
-4<f3/f<-0.8；
wherein f represents an effective focal length of the optical lens, IH represents an image height corresponding to a maximum half field angle of the optical lens, and f3 represents an effective focal length of the third lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-1<f1/f2<0；
wherein f1 represents an effective focal length of the first lens, and f2 represents an effective focal length of the second lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.5<f1/f<1.1；
wherein f1 represents an effective focal length of the first lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-0.8<f/f2<0；
where f2 denotes an effective focal length of the second lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0<f/f4<0.7；
wherein f4 denotes an effective focal length of the fourth lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.8<f5/f<8；
wherein f5 denotes an effective focal length of the fifth lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.7<f4/f5<5；
where f4 denotes an effective focal length of the fourth lens, and f5 denotes an effective focal length of the fifth lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.6<f6/f<4；
where f6 denotes an effective focal length of the sixth lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-1<f7/f<-0.5；
-1<R72/f7<-0.5；
where f7 denotes an effective focal length of the seventh lens, and R72 denotes a radius of curvature of an image-side surface of the seventh lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.5<f/EPD<1.8；
where f represents an effective focal length of the optical lens, and EPD represents an entrance pupil diameter of the optical lens.
11. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.1<R51/R52<1；
wherein R51 denotes a radius of curvature of an object-side surface of the fifth lens, and R52 denotes a radius of curvature of an image-side surface of the fifth lens.
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| CN202211342049.6A CN115390227B (en) | 2022-10-31 | 2022-10-31 | Optical lens |
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