CN114690382B - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN114690382B CN114690382B CN202210611625.6A CN202210611625A CN114690382B CN 114690382 B CN114690382 B CN 114690382B CN 202210611625 A CN202210611625 A CN 202210611625A CN 114690382 B CN114690382 B CN 114690382B
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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
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention discloses an optical lens and imaging equipment, the optical lens includes from the object side to the imaging surface along the optical axis in turn: the first lens with negative 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 positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a diaphragm; a fourth lens with positive focal power, wherein the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; a fifth lens having a negative refractive power, an image-side surface of which is concave; 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 negative optical power, having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; an eighth lens element having positive optical power and having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region. The optical lens has the advantages of large field angle and high pixel.
Description
Technical Field
The present invention relates to an imaging lens, and more particularly, to an optical lens and an imaging device.
Background
The development of the optical lens to date basically meets the requirements of high definition, day and night monitoring and remote monitoring, but along with the development of market segmentation, the requirement of an ultra-wide angle camera is gradually highlighted.
At present, panoramic lenses are produced in order to solve the problem that the panoramic lenses are mainly applied to large-area open areas such as meeting rooms, offices, halls/halls, markets, warehouses and workshops. However, the existing panoramic lens has the problems that the large field angle and the high pixels cannot be well balanced.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens and an imaging apparatus having advantages of a large angle of view and high pixels.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical lens, comprising, in order from an object side to an image plane along an optical axis: the lens comprises a first lens with negative 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; the lens comprises a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; a diaphragm; the lens comprises a fourth lens with positive focal power, wherein the object-side surface of the fourth lens is a convex surface, and the image-side surface of the fourth lens is a convex surface; the image side surface of the fifth lens is a concave surface; the lens system comprises a sixth lens with positive focal power, a fourth lens, a fifth lens and a sixth lens, wherein the object-side surface of the sixth lens is a concave surface, and 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 convex at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region; an eighth lens having positive optical power, an object-side surface of the eighth lens being convex at a paraxial region, an image-side surface of the eighth lens being concave at a paraxial region; the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all plastic aspheric lenses, and the first lens and the third lens are all glass spherical lenses.
In a second aspect, the present invention provides an imaging apparatus, comprising an imaging element and the optical lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical lens into an electrical signal.
Compared with the prior art, the optical lens provided by the invention is composed of 2 glass lenses and 6 plastic lenses, has a large field angle and high pixels through specific surface shape collocation and reasonable focal power distribution, and can effectively correct the chromatic aberration of the system through reasonably selecting the glass materials of the first lens and the third lens.
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 graph illustrating f-theta distortion of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a field curvature graph of an optical lens according to a 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 graph showing the f-theta distortion of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a field curvature graph 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 graph showing the f-theta distortion of an optical lens according to a third embodiment of the present invention;
FIG. 11 is a field curvature graph 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;
fig. 13 is a schematic configuration diagram of an image forming apparatus according to a fourth 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 first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a filter.
The first lens has negative 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 positive focal power, the object-side surface of the third lens is a convex surface, and the image-side surface of the third lens is a convex 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 convex surface;
the fifth lens has negative focal power, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive focal power, the object side surface of the sixth lens is a concave surface, 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 having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the eighth lens element has a positive optical power, an object-side surface of the eighth lens element being convex at a paraxial region, and an image-side surface of the eighth lens element being concave at a paraxial region.
The first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are plastic aspheric lenses. The invention has compact structure and realizes the balance of large field angle and high pixel by mixing and matching the glass and the plastic material and reasonably restricting the surface type and focal power of each lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.1＜f/TTL＜0.2；（1）
wherein f represents the effective focal length of the optical lens, and TTL represents the total optical length of the optical lens. When the condition (1) is satisfied, the ratio of the effective focal length to the total optical length of the lens can be controlled, and the total optical length of the lens can be shortened.
In some embodiments, the optical lens satisfies the following conditional expression:
(FOV*f)/H＞40；（2）
wherein, FOV represents the maximum field angle of the optical lens, f represents the effective focal length of the optical lens, and H represents the image height corresponding to the maximum field angle of the optical lens. When the conditional expression (2) is satisfied, the requirement of the optical lens for a large field angle can be satisfied, so that the shooting range is wider, and higher resolution can be achieved when the light is insufficient.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.18<f / (f1+f2)<-0.12； (3)
-0.3<f / f1<-0.1； (4)
wherein f represents an effective focal length of the optical lens, f1 represents an effective focal length of the first lens, and f2 represents an effective focal length of the second lens. When the conditional expressions (3) and (4) are met, the focal lengths of the first lens and the second lens can be reasonably matched, the incident light angle is adjusted, and the aperture of the subsequent lens and the optical total length of the lens are favorably reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<f/EPD<2.3；（5）
where f represents an effective focal length of the optical lens, and EPD represents an entrance pupil diameter of the optical lens. When the conditional expression (5) is satisfied, the aberration of the lens can be reduced by reasonably distributing the focal power of the lens, and meanwhile, the luminous flux of the system can be increased by restricting the ratio of the focal length to the diameter of the entrance pupil, so that the imaging effect in a dark environment is enhanced, and the aberration of the marginal field of view is reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
1<DM2/DM6<1.5；（6）
where DM2 denotes an effective aperture of the second lens, and DM6 denotes an effective aperture of the sixth lens. When the conditional expression (6) is satisfied, the apertures of the second lens to the sixth lens can be limited, which is favorable for realizing the volume miniaturization of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.6<SAG11/SAG12<1；（7）
wherein SAG11 represents the saggital height at the object side effective aperture of the first lens and SAG12 represents the saggital height at the image side effective aperture of the first lens. When the conditional expression (7) is satisfied, the bending degree of the first lens can be reasonably controlled, and the molding difficulty of the first lens is reduced, so that the processing sensitivity is reduced, and the yield is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
3<(CT6+CT7+CT8)/(T67+T78)<10；（8）
wherein CT6 denotes a center thickness of the sixth lens, CT7 denotes a center thickness of the seventh lens, CT8 denotes a center thickness of the eighth lens, T67 denotes an air space between the sixth lens and the seventh lens on the optical axis, and T78 denotes an air space between the seventh lens and the eighth lens on the optical axis. When the conditional expression (8) is satisfied, the interval between the sixth lens and the eighth lens can be reasonably controlled, so that the sensitivity of the optical lens can be reduced, and the structure of the optical lens is more compact.
In some embodiments, the optical lens satisfies the following conditional expression:
4<R11/f<9；（9）
wherein R11 represents a radius of curvature of an object side surface of the first lens, and f represents an effective focal length of the optical lens; when the conditional expression (9) is satisfied, the field angle of the lens can be effectively enlarged, the light with a large field of view is collected, a wider field of view is provided, and shooting under dark and weak light is facilitated.
In some embodiments, the optical lens satisfies the following conditional expression:
2.4<R71/R72<7；（10）
wherein 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. When the conditional expression (10) is satisfied, the surface shape of the seventh lens can be reasonably controlled, and the spherical aberration and distortion of the optical lens can be corrected.
In some embodiments, the optical lens satisfies the following conditional expression:
34<V6-V7 <36；(11)
34<V8-V7<36；(12)
wherein V6 denotes an abbe number of the sixth lens, V7 denotes an abbe number of the seventh lens, and V8 denotes an abbe number of the eighth lens. When the conditional expression (11) and the conditional expression (12) are satisfied, the materials of the sixth lens, the seventh lens and the eighth lens are reasonably matched, so that the chromatic aberration correction of the optical lens and the improvement of the resolving power are facilitated.
As an implementation mode, a glass-plastic mixed matching structure of two glass spherical lenses and six plastic non-curved lenses is adopted to realize the balance of large field angle and high pixel. The first lens and the third lens are made of glass spherical materials, and the geometrical chromatic aberration of the optical system is effectively corrected through the characteristic of low dispersion of glass; the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are plastic aspheric lenses, and the aspheric lenses are adopted, so that the cost can be effectively reduced, the aberration can be corrected, and a high-cost-performance optical performance product is 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 each embodiment of the present invention, when the lens is an aspherical lens, the surface shape of the aspherical lens satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex at the position of height h along the optical axis direction, c is the paraxial curvature of the surface, and k is conic coefficient, A 2i Is the aspheric surface type coefficient of 2i 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 S19 along an optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter G1.
The first lens L1 has negative focal power, 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 element L2 has a negative optical power, the object-side surface S3 of the second lens element is concave at the paraxial region, and the image-side surface S4 of the second lens element is concave;
the third lens L3 has positive focal power, the object-side surface S5 of the third lens is a convex surface, and the image-side surface S6 of the third lens is a convex surface;
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 convex surface;
the fifth lens element L5 has negative power, the object-side surface S9 of the fifth lens element is convex at the paraxial region, and the image-side surface S10 of the fifth lens element is concave;
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 convex at the paraxial region, and the image-side surface S14 of the seventh lens element is concave at the paraxial region;
the eighth lens element L8 has positive optical power, with an object-side surface S15 of the eighth lens element being convex at the paraxial region and an image-side surface S16 of the eighth lens element being concave at the paraxial region;
the object-side surface of the filter G1 is S17, and the image-side surface is S18.
The second lens element L2, the fourth lens element L3, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7 and the eighth lens element L8 are all plastic aspheric lens elements, and the first lens element L1 and the third lens element L3 are glass spherical lens elements.
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 the respective lenses in the optical lens 100 are shown in table 2.
TABLE 2
Referring to fig. 2, fig. 3 and fig. 4, a f- θ distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the optical lens 100 are respectively shown. It can be seen from the figure that the f-theta distortion of the optical lens 100 is within ± 13%, the offset of the field curvature is controlled within ± 0.07mm, and the offset of the vertical axis chromatic aberration is controlled within ± 4 microns, which indicates that the distortion, the field curvature and the vertical axis chromatic aberration of the optical lens 100 are well corrected.
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, the optical lens 200 of the present embodiment is substantially the same as the first embodiment, but the difference is mainly that in the present embodiment, an object-side surface S3 of the second lens is a concave surface, and curvature radii, aspheric coefficients, and thicknesses of the lens surface types 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 f- θ distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the optical lens 200 are shown. It can be seen from the figure that the f-theta distortion of the optical lens 200 is within ± 25%, the offset of the field curvature is controlled within ± 0.08mm, and the offset of the vertical axis chromatic aberration is controlled within ± 4 microns, which indicates that the distortion, the field curvature and the vertical axis chromatic aberration of the optical lens 200 are well corrected.
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 mainly differs in the curvature radius, aspheric coefficient, and thickness of each lens surface type.
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 the respective lenses of the optical lens 300 are shown in table 6.
TABLE 6
Referring to fig. 10, 11 and 12, a f- θ distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the optical lens 300 are respectively shown. It can be seen from the figure that the f-theta distortion of the optical lens 300 is within ± 55%, the offset of the field curvature is controlled within ± 0.11mm, and the offset of the vertical axis chromatic aberration is controlled within ± 4 microns, which indicates that the distortion, the field curvature and the vertical axis chromatic aberration of the optical lens 300 are well corrected.
Please refer to table 7, which shows the optical characteristics of the optical lens provided in the above three embodiments, including the field angle 2 θ, the total optical length TTL, the actual half-image height IH, the effective focal length f, the entrance pupil diameter EPD, and the related values corresponding to each of the aforementioned conditional expressions.
TABLE 7
Compared with the prior art, the optical lens provided by the invention at least has the following advantages:
(1) Because the glass has better light transmission and higher refractive index, the optical lens provided by the invention can be basically consistent with the optical quality of the current mainstream 8 plastic lenses by adopting 2 glass lenses and 6 plastic lenses, and has more excellent light transmittance and optical performance, thereby realizing high pixel of the lens.
(2) The optical lens provided by the invention adopts eight glass-plastic mixed lenses, meets the requirement of a large field angle of the lens through specific surface shape collocation and reasonable focal power distribution, has a more compact structure (TTL is less than 15.2 mm), and has the advantages of large aperture, high pixel, low sensitivity, good resolving power and the like.
Fourth embodiment
Referring to fig. 13, an imaging device 400 according to a fourth embodiment of the present invention is shown, where the imaging device 400 may include an imaging element 410 and an optical lens (e.g., the optical lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 400 may be a smart phone, a tablet computer, a monitoring device, or any other electronic device equipped with the optical lens.
The imaging apparatus 400 provided in the present embodiment includes the optical lens 100, and since the optical lens 100 has advantages of a large angle of view and high pixels, the imaging apparatus 400 having the optical lens 100 also has advantages of a large angle of view and high pixels.
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 examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical lens, comprising, in order from an object side to an image plane along an optical axis:
the lens comprises a first lens with negative 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;
the lens comprises a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface;
a diaphragm;
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 convex surface;
the image side surface of the fifth lens is a concave surface;
the sixth lens is provided with positive focal power, the object side surface of the sixth lens is a concave surface, and 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 convex at a paraxial region, an image side surface of the seventh lens being concave at a paraxial region;
an eighth lens having a positive optical power, an object-side surface of the eighth lens being convex at a paraxial region, an image-side surface of the eighth lens being concave at a paraxial region;
the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all plastic aspheric lenses, and the first lens and the third lens are all glass spherical lenses;
the optical lens satisfies the following conditional expression:
1.5＜f/EPD<2.3；
where f represents an effective focal length of the optical lens, and EPD represents an entrance pupil diameter of the optical lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.1＜f/TTL＜0.2；
wherein f represents the effective focal length of the optical lens, and TTL represents the total optical length of the optical lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
(FOV*f)/H＞40；
wherein, FOV represents the maximum field angle of the optical lens, f represents the effective focal length of the optical lens, and H represents the image height corresponding to the maximum field angle of the optical lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-0.18<f/(f1+f2)<-0.12；
-0.3<f/f1<-0.1；
wherein f represents an effective focal length of the optical lens, f1 represents an effective focal length of the first lens, and f2 represents 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:
1<DM2/DM6<1.5；
where DM2 denotes an effective aperture of the second lens, and DM6 denotes an effective aperture of the sixth lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.6<SAG11/SAG12<1；
wherein SAG11 represents the saggital height at the object side effective aperture of the first lens and SAG12 represents the saggital height at the image side effective aperture of the first lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
3<(CT6+CT7+CT8)/(T67+T78)<10；
wherein CT6 denotes a center thickness of the sixth lens, CT7 denotes a center thickness of the seventh lens, CT8 denotes a center thickness of the eighth lens, T67 denotes an air space between the sixth lens and the seventh lens on the optical axis, and T78 denotes an air space between the seventh lens and the eighth lens on the optical axis.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
4<R11/f<9；
where R11 denotes a radius of curvature of an object side surface of the first lens, and f denotes an effective focal length of the optical lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
2.4<R71/R72<7；
wherein 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.
10. An imaging apparatus comprising the optical lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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| JP2022054357A (en) * | 2020-09-25 | 2022-04-06 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッド | Lens system, image capturing device, and mobile body |
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| CN111596446B (en) * | 2020-07-27 | 2020-10-27 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN114488473A (en) * | 2021-12-25 | 2022-05-13 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2022054357A (en) * | 2020-09-25 | 2022-04-06 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッド | Lens system, image capturing device, and mobile body |
| CN114089510A (en) * | 2022-01-21 | 2022-02-25 | 江西联益光学有限公司 | Optical lens |
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