CN220040855U - Optical imaging system - Google Patents
Optical imaging system Download PDFInfo
- Publication number
- CN220040855U CN220040855U CN202321077401.8U CN202321077401U CN220040855U CN 220040855 U CN220040855 U CN 220040855U CN 202321077401 U CN202321077401 U CN 202321077401U CN 220040855 U CN220040855 U CN 220040855U
- Authority
- CN
- China
- Prior art keywords
- lens
- imaging system
- optical imaging
- curvature
- 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.)
- Active
Links
- 238000012634 optical imaging Methods 0.000 title claims abstract description 208
- 230000003287 optical effect Effects 0.000 claims abstract description 64
- 238000003384 imaging method Methods 0.000 claims description 32
- 230000004075 alteration Effects 0.000 description 10
- 239000011521 glass Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000014509 gene expression Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 201000009310 astigmatism Diseases 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- WTFUTSCZYYCBAY-SXBRIOAWSA-N 6-[(E)-C-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-N-hydroxycarbonimidoyl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C/C(=N/O)/C1=CC2=C(NC(O2)=O)C=C1 WTFUTSCZYYCBAY-SXBRIOAWSA-N 0.000 description 1
- MKYBYDHXWVHEJW-UHFFFAOYSA-N N-[1-oxo-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propan-2-yl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(C(C)NC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 MKYBYDHXWVHEJW-UHFFFAOYSA-N 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Lenses (AREA)
Abstract
The utility model discloses an optical imaging system, which sequentially comprises from an object side to an image side along an optical axis: a first lens having a negative refractive power, an image side surface of which is concave; a second lens with a convex object side surface; a third lens having positive refractive power, both the object-side surface and the image-side surface of which are convex; a fourth lens element with a concave image-side surface; a fifth lens having positive refractive power; a sixth lens element with optical power, the image-side surface of which is convex; a seventh lens having a negative refractive power; when the refractive power of the sixth lens is different from the positive and negative properties of the refractive power of the seventh lens, the object side surface of the sixth lens is a convex surface, the object side surface of the seventh lens is a concave surface, and the optical imaging system satisfies: (R61+R62) ×F6/(R71+R72) ×F7|is not more than 20, R61 is the radius of curvature of the object side surface of the sixth lens, R62 is the radius of curvature of the image side surface of the sixth lens, F6 is the effective focal length of the sixth lens, R71 is the radius of curvature of the object side surface of the seventh lens, R72 is the radius of curvature of the image side surface of the seventh lens, and F7 is the effective focal length of the seventh lens.
Description
Technical Field
The utility model relates to the field of optical devices, in particular to a seven-piece optical imaging system.
Background
With the development of technology, imaging systems with miniaturization, high resolution, low cost, and large field of view have received increasing attention from the public. Most of the imaging systems of unmanned aerial vehicles and moving cameras are required to have ultra-high optical quality and a sufficiently large imaging range.
However, there are still a number of problems with the existing imaging systems of unmanned aerial vehicles or motion cameras on the market. For example, an imaging system is difficult to be applied to a use environment with a large visual range because of a small angle of view; the lens configuration form of the camera system cannot perform good correction on system aberration, so that the imaging quality of the camera system is poor; the overall length of the camera system is too long, and the size is too large, so that the overall cost and weight of the camera system are too high.
Therefore, how to provide an optical imaging system with large field angle, high resolution, small volume and low cost is a technical problem to be solved in the art.
Disclosure of Invention
The present utility model provides an optical imaging system that at least solves or partially solves at least one problem, or other problems, present in the prior art.
An aspect of the present utility model provides an optical imaging system including, in order from an object side to an image side along an optical axis: a first lens having a negative refractive power, an image side surface of which is concave; a second lens having optical power, the object side surface of which is convex; a third lens having positive refractive power, both the object-side surface and the image-side surface of which are convex; a fourth lens element with refractive power having a concave image-side surface; a fifth lens having positive refractive power; a sixth lens element with optical power, the image-side surface of which is convex; a seventh lens having a negative refractive power; wherein the number of lenses of the optical imaging system having refractive power is seven, the refractive power of the second lens is different from the positive and negative properties of the refractive power of the fourth lens, the radius of curvature of the image side of the fifth lens is the same as the positive and negative properties of the radius of curvature of the object side of the sixth lens, and when the refractive power of the sixth lens is different from the positive and negative properties of the refractive power of the seventh lens, the object side of the sixth lens is convex, the object side of the seventh lens is concave, and the optical imaging system satisfies: (R61+R62) ×F6/(R71+R72) ×F7|is less than or equal to 20, wherein R61 is the radius of curvature of the object side surface of the sixth lens, R62 is the radius of curvature of the image side surface of the sixth lens, F6 is the effective focal length of the sixth lens, R71 is the radius of curvature of the object side surface of the seventh lens, R72 is the radius of curvature of the image side surface of the seventh lens, and F7 is the effective focal length of the seventh lens.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: -1.42.ltoreq.F1/F.ltoreq.0.90, wherein F1 is the effective focal length of the first lens and F is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: 2.00 < R11/F1 < 52.00, wherein R11 is the radius of curvature of the object side surface of the first lens, and F1 is the effective focal length of the first lens.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: 1.50-20.00, wherein F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: F3/F is more than or equal to 0.95 and less than or equal to 1.32, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: and the ratio of the I F2 to the F3 is less than or equal to 17.00, wherein F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: -2.14.ltoreq.F7/F.ltoreq.0.79, wherein F7 is the effective focal length of the seventh lens, F is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: -2.33.ltoreq.F45/F.ltoreq.1.89, wherein F45 is the effective combined focal length of the fourth lens and the fifth lens, F is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: -1.36 +.R31+R32)/d 3 +.1.20, where R31 is the radius of curvature of the object-side surface of the third lens, R32 is the radius of curvature of the image-side surface of the third lens, and d3 is the center thickness of the third lens on the optical axis.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: 4.58.ltoreq.dmax/dmin.ltoreq.11.80, where dmax is the maximum value of the center thickness on the optical axis of all lenses of the optical imaging system, dmin is the minimum value of the center thickness on the optical axis of all lenses of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: -0.30 +.ltoreq.R31+R32)/R22 +.0.14, where R22 is the radius of curvature of the image side of the second lens, R31 is the radius of curvature of the object side of the third lens, and R32 is the radius of curvature of the image side of the third lens.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: -1.00 +.ltoreq.R41+R42)/F4 +.9.00, where R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, and F4 is the effective focal length of the fourth lens.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: -4.80 +.r 51+r52)/F5 +.4.21, where R51 is the radius of curvature of the object-side surface of the fifth lens, R52 is the radius of curvature of the image-side surface of the fifth lens, and F5 is the effective focal length of the fifth lens.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: and (d1+d2+d3)/TTL is more than or equal to 0.31 and less than or equal to 0.42, wherein d1 is the central thickness of the first lens on the optical axis, d2 is the central thickness of the second lens on the optical axis, d3 is the central thickness of the third lens on the optical axis, and TTL is the total length of an optical system of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: TTL/H is more than or equal to 2.90 and less than or equal to 3.05, wherein TTL is the total length of an optical system of the optical imaging system, and H is the half-image height of the optical imaging system.
According to an exemplary embodiment of the present utility model, the optical imaging system further satisfies: BFL is the on-axis distance from the image side surface of the seventh lens to the imaging surface of the optical imaging system, and TTL is the total length of the optical system of the optical imaging system, wherein BFL is more than or equal to 0.13 and less than or equal to 0.19.
The optical imaging system provided by the utility model adopts seven lenses, and at least one beneficial effect of large field angle, high resolution, small volume, low cost and the like can be realized by reasonably distributing the refractive power and the surface shape of each lens, combining and collocating the specific parameters of the radius of curvature of the object side surface and the image side surface of the sixth lens, the effective focal length of the sixth lens, the radius of curvature of the object side surface and the image side surface of the seventh lens, the effective focal length of the seventh lens and the like.
Drawings
Other features, objects and advantages of the present utility model will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 shows a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present utility model;
fig. 2 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present utility model;
fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present utility model;
fig. 4 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present utility model; and
fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present utility model.
Detailed Description
For a better understanding of the utility model, various aspects of the utility model are described in detail with reference to the drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the utility model and is not intended to limit the scope of the utility model in any way.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then 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. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature.
Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model pertains. The terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
The optical imaging system according to an exemplary embodiment of the present utility model may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are sequentially arranged from an object side to an image side along an optical axis. An air space may be provided between adjacent two lenses of the first to seventh lenses.
In an exemplary embodiment, the first lens may have a negative refractive power, an object-side surface thereof may be convex or concave, and an image-side surface thereof may be concave. By making the first lens a negative lens and its image side surface concave, it is possible to converge as much as possible the large-field incident light into the optical system, effectively enlarging the field angle of the optical imaging system, and ensuring that the maximum field angle FOV of the optical imaging system is 165 ° or more.
In an exemplary embodiment, the second lens may have a positive refractive power or a negative refractive power, and the object-side surface thereof may be convex, and the image-side surface thereof may be convex or concave. By making the object side surface of the second lens be a convex surface, the incident light beam trend can be effectively controlled, the system aberration of the optical imaging system can be reduced, and the image quality of the optical imaging system can be improved.
In an exemplary embodiment, the third lens may have a positive refractive power, and both the object side and the image side thereof may be convex. By configuring the third lens as a biconvex positive lens, it is advantageous to compensate for chromatic aberration, curvature of field, and the like generated by the first lens, the second lens, and the like, and to reduce the pressure of correcting the aberration by the rear lens.
In an exemplary embodiment, the fourth lens element may have positive or negative refractive power, and the object-side surface thereof may be convex or concave, and the image-side surface thereof may be concave. By making the image side surface of the fourth lens be a concave surface, the light ray direction can be effectively controlled, the light path is smooth, the tolerance sensitivity of the optical imaging system is reduced, and the assembly yield of the optical imaging system is improved.
In an exemplary embodiment, the fifth lens may have a positive refractive power, an object-side surface thereof may be convex or concave, and an image-side surface thereof may be convex or concave. The fifth lens is made to be a positive lens, so that various aberrations of the optical imaging system are balanced, the imaging quality of the optical imaging system is improved, meanwhile, the light ray trend can be controlled, and the light ray is lifted, so that the illumination of the optical imaging system is improved while the requirement of the image plane size is met.
In an exemplary embodiment, the sixth lens may have a positive refractive power, an object-side surface thereof may be convex, and an image-side surface thereof may be convex. Alternatively, the sixth lens element may have negative refractive power, wherein the object-side surface thereof may be concave and the image-side surface thereof may be convex. The optical power and the surface shape of the sixth lens are restrained, so that the light ray trend can be effectively controlled, the light ray is lifted, the astigmatism of the optical imaging system is balanced, and the requirement of the image surface size is met; meanwhile, the distortion of the optical imaging system can be effectively corrected, and the deformation degree of the formed image is reduced.
In an exemplary embodiment, the seventh lens element may have a negative refractive power, and the object-side surface thereof may be convex or concave, and the image-side surface thereof may be convex or concave. By making the seventh lens a negative lens, the light ray trend can be effectively controlled, and the light ray is lifted so as to meet the requirement of the image plane size; meanwhile, the optical distortion of the near-axis region of the imaging surface of the optical imaging system can be effectively corrected, the deformation degree of the formed image is reduced, and the imaging performance of the optical imaging system is improved.
In an exemplary embodiment, the positive and negative properties of the optical power of the second lens and the optical power of the fourth lens may be different. For example, the second lens has a positive refractive power, and the fourth lens has a negative refractive power. Alternatively, the second lens has a negative refractive power and the fourth lens has a positive refractive power.
In an exemplary embodiment, the radius of curvature of the image side of the fifth lens is the same as the positive and negative properties of the radius of curvature of the object side of the sixth lens. For example, the radius of curvature of the image side of the fifth lens element and the radius of curvature of the object side of the sixth lens element are negative. Alternatively, the radius of curvature of the image side surface of the fifth lens element and the radius of curvature of the object side surface of the sixth lens element are both positive.
In an exemplary embodiment, when the refractive power of the sixth lens is different from the positive and negative properties of the refractive power of the seventh lens, the object-side surface of the sixth lens is convex, and the object-side surface of the seventh lens is concave. In other words, when the sixth lens element has positive refractive power, the object-side surface of the sixth lens element is convex, and the object-side surface of the seventh lens element is concave.
In an exemplary embodiment, the optical imaging system may further satisfy: (R61+R62) ×F6/(R71+R72) ×F7|is less than or equal to 20, wherein R61 is the radius of curvature of the object side surface of the sixth lens, R62 is the radius of curvature of the image side surface of the sixth lens, F6 is the effective focal length of the sixth lens, R71 is the radius of curvature of the object side surface of the seventh lens, R72 is the radius of curvature of the image side surface of the seventh lens, and F7 is the effective focal length of the seventh lens. The mutual relations among the curvature radiuses of the object side surface and the image side surface of the sixth lens, the effective focal length of the sixth lens, the curvature radiuses of the object side surface and the image side surface of the seventh lens and the effective focal length of the seventh lens are reasonably controlled, so that the light ray trend can be effectively controlled, the deflection angle of the light ray from the sixth lens to the seventh lens is reduced, the tolerance sensitivity of an optical imaging system is reduced, the yield of the optical imaging system is improved, and meanwhile, the light ray can be raised to meet the requirement of the image plane size.
In an exemplary embodiment, the optical imaging system may further satisfy: -1.42.ltoreq.F1/F.ltoreq.0.90, wherein F1 is the effective focal length of the first lens and F is the total effective focal length of the optical imaging system. The correlation between the effective focal length of the first lens and the total effective focal length of the optical imaging system is reasonably controlled, so that large-angle light rays are converged into the optical imaging system, the field angle of view of the optical imaging system is effectively enlarged, and the maximum field angle FOV of the optical imaging system can be ensured to be larger than or equal to 165 degrees.
In an exemplary embodiment, the optical imaging system may further satisfy: 2.00 < R11/F1 < 52.00, wherein R11 is the radius of curvature of the object side surface of the first lens, and F1 is the effective focal length of the first lens. The interrelationship between the curvature radius of the object side surface of the first lens and the effective focal length of the first lens is reasonably controlled, so that positive distortion can be generated by the first lens, and negative distortion generated by other lenses in the optical imaging system can be balanced by the positive distortion generated by the first lens; meanwhile, the optical distortion of the edge view field can be effectively regulated, so that the deformation degree of the formed image is small, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: 1.50-20.00, wherein F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical imaging system. And the correlation between the effective focal length of the second lens and the total effective focal length of the optical imaging system is reasonably controlled, so that the integration of light rays with different fields of view is facilitated, and the imaging brightness of an image space is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: F3/F is more than or equal to 0.95 and less than or equal to 1.32, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the optical imaging system. The interrelationship between the effective focal length of the third lens and the total effective focal length of the optical imaging system is reasonably controlled, which is favorable for controlling the trend of the light path, and ensures that more light stably enters the rear of the system, thereby improving the illumination of the optical imaging system while ensuring the imaging stability.
In an exemplary embodiment, the optical imaging system may further satisfy: and the ratio of the I F2 to the F3 is less than or equal to 17.00, wherein F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens. The correlation between the effective focal length of the second lens and the effective focal length of the third lens is reasonably controlled, so that the refractive powers of the second lens and the third lens are reasonably matched, astigmatism, spherical aberration and field curvature generated by the optical imaging system are balanced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: -2.14.ltoreq.F7/F.ltoreq.0.79, wherein F7 is the effective focal length of the seventh lens, F is the total effective focal length of the optical imaging system. The correlation between the effective focal length of the seventh lens and the total effective focal length of the optical imaging system is reasonably controlled, so that the optical distortion of the paraxial region of the imaging surface of the optical imaging system can be effectively corrected, the deformation degree of the formed image is reduced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: -2.33.ltoreq.F45/F.ltoreq.1.89, wherein F45 is the effective combined focal length of the fourth lens and the fifth lens, F is the total effective focal length of the optical imaging system. The correlation between the effective combined focal length of the fourth lens and the fifth lens and the total effective focal length of the optical imaging system is reasonably controlled, so that the correction of the field curvature and the astigmatism of the optical imaging system is facilitated, the optical distortion of the optical imaging system can be effectively corrected, the deformation degree of a formed image is reduced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: -1.36 +.R31+R32)/d 3 +.1.20, where R31 is the radius of curvature of the object-side surface of the third lens, R32 is the radius of curvature of the image-side surface of the third lens, and d3 is the center thickness of the third lens on the optical axis. The interrelationship between the object side surface of the third lens, the curvature radius of the image side surface and the central thickness of the third lens on the optical axis is reasonably controlled, the trend of the optical path can be effectively controlled, light smoothly enters the rear of the system, various aberrations generated by incident light from the first lens to the second lens are compensated, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: 4.58.ltoreq.dmax/dmin.ltoreq.11.80, where dmax is the maximum value of the center thickness on the optical axis of all lenses of the optical imaging system, dmin is the minimum value of the center thickness on the optical axis of all lenses of the optical imaging system. Through controlling the conditional expression, the central thickness of each lens on the optical axis can be reasonably distributed, the effect of each lens is stable, the trend change of light rays in a high-low temperature environment is guaranteed to be smaller, and further the optical imaging system is free from virtual focus in the high-low temperature environment.
In an exemplary embodiment, the optical imaging system may further satisfy: -0.30 +.ltoreq.R31+R32)/R22 +.0.14, where R22 is the radius of curvature of the image side of the second lens, R31 is the radius of curvature of the object side of the third lens, and R32 is the radius of curvature of the image side of the third lens. The interrelationship among the curvature radiuses of the image side surface of the second lens, the object side surface of the third lens and the image side surface is reasonably controlled, so that the optical imaging system has a larger entrance pupil diameter, the maximum light flux of the optical imaging system is ensured as much as possible, and the illuminance of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: -1.00 +.ltoreq.R41+R42)/F4 +.9.00, where R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, and F4 is the effective focal length of the fourth lens. The interrelationship between the object side surface of the fourth lens, the curvature radius of the image side surface and the effective focal length of the fourth lens is reasonably controlled, the light trend can be effectively controlled, the light is lifted, and the illumination of the optical imaging system is improved while the size requirement of the image plane is met.
In an exemplary embodiment, the optical imaging system may further satisfy: -4.80 +.r 51+r52)/F5 +.4.21, where R51 is the radius of curvature of the object-side surface of the fifth lens, R52 is the radius of curvature of the image-side surface of the fifth lens, and F5 is the effective focal length of the fifth lens. The interrelationship between the object side surface of the fifth lens, the curvature radius of the image side surface and the effective focal length of the fifth lens is reasonably controlled, the light trend can be effectively controlled, the deflection angle of the incident light ray and the emergent light ray of the fifth lens is slowed down, the light ray smoothly enters the rear of the system, the tolerance sensitivity of the optical imaging system is reduced, and the assembly yield of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: and (d1+d2+d3)/TTL is more than or equal to 0.31 and less than or equal to 0.42, wherein d1 is the central thickness of the first lens on the optical axis, d2 is the central thickness of the second lens on the optical axis, d3 is the central thickness of the third lens on the optical axis, and TTL is the total length of an optical system of the optical imaging system. Through controlling the conditional expression, the thicknesses of the centers of the first lens, the second lens and the third lens on the optical axis can be reasonably distributed, the machinability of the first lens to the third lens is improved, the sensitivity of the optical imaging system is reduced, the total length of the optical system of the optical imaging system is reduced, and the total length of the optical system is ensured to be less than or equal to 10mm.
In an exemplary embodiment, the optical imaging system may further satisfy: TTL/H is more than or equal to 2.90 and less than or equal to 3.05, wherein TTL is the total length of an optical system of the optical imaging system, and H is the half-image height of the optical imaging system. Under the condition that the half image height of the optical imaging system is fixed, the miniaturization of the optical imaging system is facilitated by reasonably configuring the total length of the optical system of the optical imaging system.
In an exemplary embodiment, the optical imaging system may further satisfy: BFL is the on-axis distance from the image side surface of the seventh lens to the imaging surface of the optical imaging system, and TTL is the total length of the optical system of the optical imaging system, wherein BFL is more than or equal to 0.13 and less than or equal to 0.19. By controlling the conditional expression, the axial distance from the image side surface of the seventh lens to the imaging surface of the optical imaging system can be reasonably distributed, the assembly yield of the optical imaging system is improved, and the installation space is reserved for other optical elements, so that the optical imaging system is convenient to assemble.
In an exemplary embodiment, the optical imaging system may further include a diaphragm, which may be disposed between the second lens and the third lens or between the third lens and the fourth lens according to actual needs. By arranging the diaphragm at the position, light entering the system can be effectively restrained, the total length of an optical system of the optical imaging system is shortened, the maximum light-transmitting caliber of the optical imaging system is reduced, and the miniaturization design is facilitated.
In an exemplary embodiment, a portion of the lenses in the optical imaging system are glass lenses and another portion of the lenses are plastic lenses. The structural forms of the glass lens and the plastic lens can reduce the cost of the optical imaging system, and are beneficial to balancing the high and low temperature performances of the optical imaging system, so that the optical imaging system has good imaging quality in the range of-20 ℃ to 80 ℃.
The optical imaging system according to the above embodiment of the present utility model may employ a plurality of lenses, such as seven lenses described above. By reasonably distributing optical parameters such as refractive power, surface shape, center thickness of each lens, and on-axis spacing between each lens, at least one of a large field angle, high resolution, small volume, and low cost of the optical imaging system can be realized.
In an embodiment of the present utility model, at least one of the mirror surfaces of each of the first to seventh lenses is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.
However, those skilled in the art will appreciate that the number of lenses making up an optical imaging system may be varied to achieve the various results and advantages described in this specification without departing from the scope of the utility model as claimed.
Specific examples of the optical imaging system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.
Example 1
An optical imaging system according to embodiment 1 of the present utility model is described below with reference to fig. 1. Fig. 1 is a schematic configuration diagram of an optical imaging system according to embodiment 1 of the present utility model.
As shown in fig. 1, the optical imaging system 100 includes, in order from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The stop STO may be disposed between the third lens L3 and the fourth lens L4. The second lens L2, the third lens L3, the fourth lens L4, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses. The first lens L1 and the fifth lens L5 are both glass aspherical lenses.
The first lens element L1 has a negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element L2 has a positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a negative refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is convex. The sixth lens element L6 has a negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element L7 with negative refractive power has a convex object-side surface S13 and a concave image-side surface S14. The filter CG has an object side surface S15 and an image side surface S16. Light from the object passes sequentially through the respective surfaces S1 to S16 and is finally imaged on the imaging plane IMA. The surfaces S1 to S16 are not shown in fig. 1.
Table 1 shows a basic parameter table of the optical imaging system 100 of embodiment 1, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In the present embodiment, the maximum field angle fov=165° of the optical imaging system, and the f-number fno=2.31 of the optical imaging system.
In embodiment 1, the object side surface and the image side surface of any one of the first lens L1 to the seventh lens L7 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 shows the cone coefficients k and the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1 to S14 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -151.83 | 1.11E-02 | -1.16E-03 | 2.83E-05 | 2.40E-06 | -1.49E-07 | 1.97E-09 | 0.0000E+00 |
| S2 | -0.49 | 6.53E-03 | 3.06E-03 | 9.93E-04 | 3.89E-04 | -3.25E-04 | 2.30E-05 | 0.0000E+00 |
| S3 | -6.52 | -2.49E-02 | 3.58E-03 | -8.70E-04 | -4.18E-04 | 7.71E-05 | 8.57E-06 | 0.0000E+00 |
| S4 | 4.43 | -1.72E-03 | -4.90E-02 | 3.12E-02 | 1.92E-02 | -4.58E-02 | 1.66E-02 | 0.0000E+00 |
| S5 | 6.09 | 6.79E-02 | -8.55E-02 | 7.00E-02 | 1.33E-04 | -4.09E-02 | 1.68E-02 | 0.0000E+00 |
| S6 | -7.15 | 4.61E-02 | -3.25E-02 | 3.67E-02 | 4.66E-02 | -8.17E-02 | 5.21E-02 | 0.0000E+00 |
| S7 | -4.66 | -5.10E-02 | 5.10E-02 | -2.82E-01 | 4.26E-01 | -4.04E-01 | 1.54E-01 | 0.0000E+00 |
| S8 | -0.81 | -1.56E-01 | 1.32E-01 | -1.51E-01 | 4.74E-02 | 3.47E-02 | -1.90E-02 | 0.0000E+00 |
| S9 | 4.58 | -1.37E-03 | 7.00E-03 | 3.85E-03 | -3.99E-03 | 2.00E-03 | -3.19E-04 | 0.0000E+00 |
| S10 | -0.24 | 2.62E-03 | 3.81E-03 | 7.94E-03 | -7.67E-03 | 3.19E-03 | -1.32E-04 | 0.0000E+00 |
| S11 | 0.00 | 1.02E-01 | -5.39E-02 | 2.07E-02 | -3.91E-03 | -1.85E-04 | 4.87E-04 | 0.0000E+00 |
| S12 | 0.00 | 8.44E-02 | -5.62E-02 | 2.02E-02 | -4.17E-03 | -1.02E-04 | 1.36E-04 | 0.0000E+00 |
| S13 | -32.38 | -1.58E-01 | 1.35E-02 | 5.82E-03 | -4.06E-03 | -5.24E-04 | 2.78E-04 | 0.0000E+00 |
| S14 | -6.58 | -7.14E-02 | 2.34E-02 | -5.19E-03 | 6.14E-04 | -3.08E-05 | 9.05E-08 | 0.0000E+00 |
TABLE 2
Example 2
An optical imaging system according to embodiment 2 of the present utility model is described below with reference to fig. 2. Fig. 2 is a schematic structural view of an optical imaging system according to embodiment 2 of the present utility model.
As shown in fig. 2, the optical imaging system 200 includes, in order from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The stop STO may be disposed between the third lens L3 and the fourth lens L4. The second lens L2, the third lens L3, the fourth lens L4, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses. The first lens L1 is a glass spherical lens, and the fifth lens L5 is a glass aspherical lens.
The first lens element L1 has a negative refractive power, wherein an object-side surface S1 thereof is concave, and an image-side surface S2 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex. The sixth lens element L6 has a negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element L7 with negative refractive power has a convex object-side surface S13 and a concave image-side surface S14. The filter CG has an object side surface S15 and an image side surface S16. Light from the object passes sequentially through the respective surfaces S1 to S16 and is finally imaged on the imaging plane IMA. The surfaces S1 to S16 are not shown in fig. 2.
Table 3 shows a basic parameter table of the optical imaging system 200 of embodiment 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 3 Table 3
In the present embodiment, the maximum field angle fov=165° of the optical imaging system, and the f-number fno=2.33 of the optical imaging system.
In embodiment 2, the object side surface and the image side surface of any one of the second lens L2 to the seventh lens L7 are aspherical surfaces. Table 4 shows the cone coefficients k and the higher order coefficients A for each of the aspherical mirror surfaces S3 to S14 usable in example 2 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
TABLE 4 Table 4
Example 3
An optical imaging system according to embodiment 3 of the present utility model is described below with reference to fig. 3. Fig. 3 is a schematic structural view of an optical imaging system according to embodiment 3 of the present utility model.
As shown in fig. 3, the optical imaging system 300 includes, in order from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The stop STO may be disposed between the third lens L3 and the fourth lens L4. The second lens L2, the third lens L3, the fourth lens L4, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses. The first lens L1 is a glass spherical lens, and the fifth lens L5 is a glass aspherical lens.
The first lens element L1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is convex. The sixth lens element L6 has a negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element L7 with negative refractive power has a convex object-side surface S13 and a concave image-side surface S14. The filter CG has an object side surface S15 and an image side surface S16. Light from the object passes sequentially through the respective surfaces S1 to S16 and is finally imaged on the imaging plane IMA. The surfaces S1 to S16 are not shown in fig. 3.
Table 5 shows a basic parameter table of the optical imaging system 300 of example 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 5
In the present embodiment, the maximum field angle fov=165° of the optical imaging system, and the f-number fno=2.33 of the optical imaging system.
In embodiment 3, the object side surface and the image side surface of any one of the second lens L2 to the seventh lens L7 are aspherical surfaces. Table 6 shows the cone coefficients k and the higher order coefficients A for each of the aspherical mirror surfaces S3 to S14 usable in example 3 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | -24.27 | 1.93E-02 | -4.90E-03 | -6.37E-04 | 6.74E-04 | -2.31E-04 | 0.0000E+00 | 0.0000E+00 |
| S4 | 4.03 | 5.22E-02 | 3.89E-03 | -2.02E-02 | 4.15E-03 | -4.75E-03 | 0.0000E+00 | 0.0000E+00 |
| S5 | 0.00 | 5.86E-02 | 1.59E-02 | 2.67E-03 | -1.47E-02 | 9.51E-03 | 0.0000E+00 | 0.0000E+00 |
| S6 | 0.00 | 2.43E-02 | -8.48E-04 | 4.02E-03 | 6.29E-03 | -1.74E-03 | 0.0000E+00 | 0.0000E+00 |
| S7 | 2.13 | -4.45E-03 | 4.03E-02 | -1.83E-01 | 2.48E-01 | -1.65E-01 | 0.0000E+00 | 0.0000E+00 |
| S8 | 12.79 | 7.32E-03 | -6.22E-03 | 8.67E-03 | -2.04E-03 | -1.90E-03 | 0.0000E+00 | 0.0000E+00 |
| S9 | 5.97 | -1.43E-02 | 6.87E-05 | 1.49E-02 | 1.18E-03 | -1.21E-03 | 0.0000E+00 | 0.0000E+00 |
| S10 | -2.94 | -5.28E-02 | -8.10E-03 | 2.86E-02 | -1.76E-02 | 3.76E-03 | 0.0000E+00 | 0.0000E+00 |
| S11 | 0.00 | 1.04E-01 | -3.88E-03 | -1.69E-03 | 9.23E-05 | -7.51E-06 | 0.0000E+00 | 0.0000E+00 |
| S12 | 0.00 | 3.33E-02 | -4.19E-02 | 1.34E-02 | 1.03E-03 | -9.17E-04 | 0.0000E+00 | 0.0000E+00 |
| S13 | 4.28 | -9.17E-02 | -2.53E-02 | 9.75E-03 | -5.36E-04 | -3.62E-04 | 0.0000E+00 | 0.0000E+00 |
| S14 | -5.22 | -6.36E-02 | 1.50E-02 | -2.45E-03 | 1.95E-04 | -4.75E-06 | 0.0000E+00 | 0.0000E+00 |
TABLE 6
Example 4
An optical imaging system according to embodiment 4 of the present utility model is described below with reference to fig. 4. Fig. 4 is a schematic structural view of an optical imaging system according to embodiment 4 of the present utility model.
As shown in fig. 4, the optical imaging system 400 includes, in order from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The stop STO may be disposed between the second lens L2 and the third lens L3. The second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses. The first lens L1 and the third lens L3 are both glass aspherical lenses.
The first lens element L1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element L2 has a positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element L6 has a positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element L7 has a negative refractive power, wherein an object-side surface S13 thereof is concave, and an image-side surface S14 thereof is concave. The filter CG has an object side surface S15 and an image side surface S16. Light from the object passes sequentially through the respective surfaces S1 to S16 and is finally imaged on the imaging plane IMA. The surfaces S1 to S16 are not shown in fig. 4.
Table 7 shows a basic parameter table of the optical imaging system 400 of embodiment 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 7
In the present embodiment, the maximum field angle fov=167° of the optical imaging system, and the f-number fno=2.30 of the optical imaging system.
In embodiment 4, the object side surface and the image side surface of any one of the first lens L1 to the seventh lens L7 are aspherical surfaces. Table 8 shows the cone coefficients k and the higher order coefficients A for each of the aspherical mirror surfaces S1 to S14 usable in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -0.14 | -1.43E-03 | -1.53E-05 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S2 | -0.89 | 2.45E-02 | 4.69E-03 | 8.22E-04 | -1.58E-04 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S3 | -7.16 | -2.05E-02 | -4.21E-03 | -1.82E-03 | 8.39E-04 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S4 | -1.58 | -6.23E-02 | 7.18E-02 | -4.28E-02 | 1.12E-02 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S5 | -18.38 | -2.18E-02 | 4.17E-02 | -6.23E-02 | 3.02E-02 | -6.34E-03 | 0.00E+00 | 0.00E+00 |
| S6 | 2.11 | -2.23E-02 | 3.06E-02 | -3.02E-02 | 1.72E-02 | -3.91E-03 | 0.00E+00 | 0.00E+00 |
| S7 | 50.00 | 1.11E-02 | -1.83E-02 | -1.55E-02 | 2.09E-02 | -5.96E-03 | -4.78E-04 | 0.00E+00 |
| S8 | -0.01 | 7.64E-03 | -1.33E-02 | 1.23E-02 | -5.00E-03 | -1.59E-04 | 1.70E-04 | 0.00E+00 |
| S9 | -24.46 | -1.47E-02 | 5.53E-02 | -1.46E-02 | -6.31E-03 | 2.11E-03 | 1.99E-04 | 0.00E+00 |
| S10 | 3.56 | -9.28E-02 | 9.52E-02 | -3.33E-02 | -9.11E-04 | 1.71E-03 | 3.02E-06 | 0.00E+00 |
| S11 | -43.29 | -2.90E-02 | 1.68E-03 | 4.20E-03 | -1.51E-03 | -3.02E-04 | 1.16E-04 | -1.87E-05 |
| S12 | -0.83 | -2.38E-03 | -5.39E-03 | -1.29E-03 | -7.39E-04 | 5.36E-05 | 2.80E-05 | 1.08E-05 |
| S13 | 2.59 | -1.56E-02 | -1.59E-03 | -2.60E-03 | -2.03E-04 | -6.85E-05 | 5.08E-05 | 1.44E-05 |
| S14 | -50.00 | -1.68E-02 | -2.72E-03 | 8.62E-04 | -4.52E-05 | -1.10E-05 | 2.10E-07 | 6.35E-08 |
TABLE 8
Example 5
An optical imaging system according to embodiment 5 of the present utility model is described below with reference to fig. 5. Fig. 5 is a schematic structural view of an optical imaging system according to embodiment 5 of the present utility model.
As shown in fig. 5, the optical imaging system 500 includes, in order from an object side to an image side along an optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. The stop STO may be disposed between the second lens L2 and the third lens L3. The second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are plastic aspherical lenses. The first lens L1 and the third lens L3 are both glass aspherical lenses.
The first lens element L1 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element L2 has a positive refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is convex. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element L4 has a negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element L6 has a positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The seventh lens element L7 with negative refractive power has a concave object-side surface S13 and a convex image-side surface S14. The filter CG has an object side surface S15 and an image side surface S16. Light from the object passes sequentially through the respective surfaces S1 to S16 and is finally imaged on the imaging plane IMA. The surfaces S1 to S16 are not shown in fig. 5.
Table 9 shows a basic parameter table of the optical imaging system 500 of example 5, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 9
In the present embodiment, the maximum field angle fov=165° of the optical imaging system, and the f-number fno=2.33 of the optical imaging system.
In embodiment 5, the object side surface and the image side surface of any one of the first lens L1 to the seventh lens L7 are aspherical surfaces. Table 10 shows the cone coefficients k and the higher order coefficients A for each of the aspherical mirror surfaces S1 to S14 usable in example 5 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -50.00 | -2.05E-03 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S2 | -0.90 | 1.75E-02 | 3.74E-03 | -3.99E-04 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S3 | -2.91 | -5.52E-03 | -7.65E-04 | -1.65E-03 | 2.78E-04 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S4 | -13.74 | -9.19E-02 | 7.19E-02 | -3.90E-02 | 9.62E-03 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S5 | 3.30 | -1.03E-01 | 4.23E-02 | -3.96E-02 | -6.17E-03 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S6 | 2.68 | -5.86E-02 | 4.44E-02 | -2.43E-02 | 3.59E-03 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S7 | 22.80 | -3.47E-02 | 1.52E-02 | 2.52E-03 | 1.59E-03 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S8 | 0.64 | -8.81E-03 | -7.03E-03 | 9.28E-03 | -2.77E-03 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| S9 | -29.79 | -3.10E-03 | 1.35E-02 | -1.02E-02 | 3.44E-03 | -4.16E-04 | 0.00E+00 | 0.00E+00 |
| S10 | -43.66 | -8.89E-02 | 6.07E-02 | -2.51E-02 | 6.04E-03 | -5.79E-04 | 0.00E+00 | 0.00E+00 |
| S11 | -14.51 | 3.83E-03 | -1.95E-02 | 1.99E-03 | 2.60E-04 | -2.66E-06 | 0.00E+00 | 0.00E+00 |
| S12 | -0.14 | -2.34E-04 | -1.09E-03 | 9.05E-06 | 1.76E-04 | -1.10E-05 | 0.00E+00 | 0.00E+00 |
| S13 | -2.59 | 4.18E-03 | 2.76E-03 | 6.86E-05 | -3.95E-05 | 1.47E-07 | 0.00E+00 | 0.00E+00 |
| S14 | 50.00 | 2.99E-02 | -1.06E-02 | 1.02E-03 | -5.21E-07 | -4.66E-06 | 0.00E+00 | 0.00E+00 |
Table 10
In summary, the conditional expressions in embodiment 1 to embodiment 5 satisfy the relationship shown in table 11.
| Condition/example | 1 | 2 | 3 | 4 | 5 |
| |(R61+R62)×F6/(R71+R72)×F7| | -17.25 | -3.95 | -3.49 | -0.06 | -0.01 |
| F1/F | -1.29 | -1.33 | -1.36 | -1.15 | -1.04 |
| |R11/F1| | 5.29 | 51.30 | 15.64 | 4.94 | 8.65 |
| |F2/F| | 19.90 | 17.99 | 9.29 | 1.92 | 1.67 |
| F3/F | 1.27 | 1.09 | 1.08 | 1.26 | 1.23 |
| |F2/F3| | 15.73 | 16.49 | 8.62 | 1.52 | 1.36 |
| (R31+R32)/d3 | 0.62 | -1.01 | -0.15 | 0.76 | 0.38 |
| F45/F | 1.29 | 0.85 | 0.85 | -1.69 | -1.73 |
| F7/F | -1.76 | -1.21 | -1.21 | -1.95 | -1.40 |
| dmax/dmin | 5.88 | 5.62 | 5.69 | 7.33 | 10.77 |
| (R31+R32)/R22 | 0.08 | -0.21 | -0.03 | -0.24 | -0.09 |
| (R41+R42)/F4 | -0.21 | 0.00 | 0.05 | 7.49 | 1.37 |
| (R51+R52)/F5 | 2.92 | -3.10 | -3.52 | 0.04 | 0.66 |
| (d1+d2+d3)/TTL | 0.33 | 0.36 | 0.36 | 0.40 | 0.40 |
| TTL/H | 2.94 | 2.94 | 3.03 | 2.97 | 3.00 |
| BFL/TTL | 0.17 | 0.18 | 0.18 | 0.15 | 0.15 |
TABLE 11
The present utility model also provides an imaging device whose electronic photosensitive element may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS), the imaging device being equipped with the above-described optical imaging system.
The above description is only illustrative of the preferred embodiments of the present utility model and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in the present utility model is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present utility model (but not limited to) having similar functions are replaced with each other.
Claims (16)
1. An optical imaging system, comprising, in order from an object side to an image side along an optical axis:
a first lens having a negative refractive power, an image side surface of which is concave;
a second lens having optical power, the object side surface of which is convex;
a third lens having positive refractive power, both the object-side surface and the image-side surface of which are convex;
a fourth lens element with refractive power having a concave image-side surface;
a fifth lens having positive refractive power;
a sixth lens element with optical power, the image-side surface of which is convex; and
a seventh lens having a negative refractive power;
wherein the number of lenses of the optical imaging system having optical power is seven,
the refractive power of the second lens is different from the positive and negative properties of the refractive power of the fourth lens, the radius of curvature of the image side of the fifth lens is the same as the positive and negative properties of the radius of curvature of the object side of the sixth lens, and when the refractive power of the sixth lens is different from the positive and negative properties of the refractive power of the seventh lens, the object side of the sixth lens is convex, the object side of the seventh lens is concave, and
the optical imaging system satisfies: (R61+R62) x F6/(R71+R72) x F7 is not more than 20,
wherein R61 is a radius of curvature of an object side surface of the sixth lens element, R62 is a radius of curvature of an image side surface of the sixth lens element, F6 is an effective focal length of the sixth lens element, R71 is a radius of curvature of an object side surface of the seventh lens element, R72 is a radius of curvature of an image side surface of the seventh lens element, and F7 is an effective focal length of the seventh lens element.
2. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
-1.42≤F1/F≤-0.90，
wherein F1 is the effective focal length of the first lens, and F is the total effective focal length of the optical imaging system.
3. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
2.00≤|R11/F1|≤52.00，
wherein R11 is a radius of curvature of an object side surface of the first lens, and F1 is an effective focal length of the first lens.
4. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
1.50≤|F2/F|≤20.00，
wherein F2 is the effective focal length of the second lens, and F is the total effective focal length of the optical imaging system.
5. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
0.95≤F3/F≤1.32，
wherein F3 is an effective focal length of the third lens, and F is a total effective focal length of the optical imaging system.
6. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
|F2/F3|≤17.00，
wherein F2 is an effective focal length of the second lens, and F3 is an effective focal length of the third lens.
7. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
-2.14≤F7/F≤-0.79，
wherein F7 is an effective focal length of the seventh lens, and F is a total effective focal length of the optical imaging system.
8. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
-2.33≤F45/F≤1.89，
wherein F45 is an effective combined focal length of the fourth lens and the fifth lens, and F is a total effective focal length of the optical imaging system.
9. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
-1.36≤(R31+R32)/d3≤1.20，
wherein R31 is a radius of curvature of an object side surface of the third lens, R32 is a radius of curvature of an image side surface of the third lens, and d3 is a center thickness of the third lens on the optical axis.
10. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
4.58≤dmax/dmin≤11.80，
wherein dmax is the maximum value of the center thickness of all lenses of the optical imaging system on the optical axis, dmin is the minimum value of the center thickness of all lenses of the optical imaging system on the optical axis.
11. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
-0.30≤(R31+R32)/R22≤0.14，
wherein R22 is a radius of curvature of the image side surface of the second lens element, R31 is a radius of curvature of the object side surface of the third lens element, and R32 is a radius of curvature of the image side surface of the third lens element.
12. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
-1.00≤(R41+R42)/F4≤9.00，
wherein R41 is a radius of curvature of an object side surface of the fourth lens element, R42 is a radius of curvature of an image side surface of the fourth lens element, and F4 is an effective focal length of the fourth lens element.
13. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
-4.80≤(R51+R52)/F5≤4.21，
wherein R51 is a radius of curvature of an object side surface of the fifth lens element, R52 is a radius of curvature of an image side surface of the fifth lens element, and F5 is an effective focal length of the fifth lens element.
14. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
0.31≤(d1+d2+d3)/TTL≤0.42，
wherein d1 is the center thickness of the first lens on the optical axis, d2 is the center thickness of the second lens on the optical axis, d3 is the center thickness of the third lens on the optical axis, and TTL is the total length of the optical system of the optical imaging system.
15. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
2.90≤TTL/H≤3.05，
wherein TTL is the total length of the optical system of the optical imaging system, and H is the half image height of the optical imaging system.
16. The optical imaging system of claim 1, wherein the optical imaging system further satisfies:
0.13≤BFL/TTL≤0.19，
wherein BFL is an on-axis distance from an image side surface of the seventh lens to an imaging surface of the optical imaging system, and TTL is an overall length of the optical system of the optical imaging system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321077401.8U CN220040855U (en) | 2023-05-06 | 2023-05-06 | Optical imaging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321077401.8U CN220040855U (en) | 2023-05-06 | 2023-05-06 | Optical imaging system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220040855U true CN220040855U (en) | 2023-11-17 |
Family
ID=88733157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321077401.8U Active CN220040855U (en) | 2023-05-06 | 2023-05-06 | Optical imaging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220040855U (en) |
-
2023
- 2023-05-06 CN CN202321077401.8U patent/CN220040855U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110068915B (en) | Optical imaging system | |
| CN109164560B (en) | Imaging lens | |
| CN113552696B (en) | Optical system, image capturing module and electronic equipment | |
| CN110297313B (en) | Image pickup optical lens | |
| CN109491055B (en) | Optical imaging lens | |
| CN113495342B (en) | Optical lens and electronic device | |
| CN109683286B (en) | Optical imaging lens | |
| CN213986999U (en) | Camera lens group | |
| CN220121076U (en) | Fish-eye lens | |
| CN111025557B (en) | Image pickup optical lens | |
| CN111025539B (en) | Image pickup optical lens | |
| CN210015279U (en) | Optical imaging lens | |
| CN110109234B (en) | Optical imaging lens | |
| CN219016688U (en) | Fixed focus lens | |
| CN116609922A (en) | Optical lens | |
| CN116609927A (en) | Fish-eye lens | |
| CN112764197B (en) | Camera lens | |
| CN214011610U (en) | Camera lens | |
| CN220040855U (en) | Optical imaging system | |
| CN211826691U (en) | Optical imaging lens | |
| CN109946823B (en) | Optical imaging lens | |
| CN113671672A (en) | Image capturing system | |
| CN111158124A (en) | Optical imaging lens | |
| CN220207979U (en) | Optical lens | |
| CN220357310U (en) | Optical lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |