CN220188791U - Optical imaging system - Google Patents
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- CN220188791U CN220188791U CN202321269871.4U CN202321269871U CN220188791U CN 220188791 U CN220188791 U CN 220188791U CN 202321269871 U CN202321269871 U CN 202321269871U CN 220188791 U CN220188791 U CN 220188791U
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Abstract
The application 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; a second lens having a negative refractive power; a third lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a sixth lens having positive refractive power; a seventh lens having a negative refractive power; an eighth lens having positive refractive power; the optical imaging system satisfies: f4/f5 is more than or equal to 0.8 and less than or equal to 2.0, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens.
Description
Technical Field
The application relates to the field of optical devices, in particular to an optical imaging system.
Background
With the development of science and technology, the requirements for optical imaging systems in the fields of panoramic monitoring, unmanned aerial vehicles, motion cameras, vehicle-mounted lenses and the like are continuously increasing, and accordingly, the requirements for the quality of the optical imaging systems are increasingly high.
In addition to the high resolution characteristic, the optical imaging system of the unmanned aerial vehicle or the moving camera needs to have a large field angle and a large aperture to realize a large field range and high brightness. However, the conventional optical imaging system cannot satisfy characteristics such as a large angle of view or a large aperture while realizing high resolution. In addition, in order to ensure the temperature performance of the traditional optical imaging system, the optical imaging system is made of materials with stable thermal expansion coefficients, so that the cost of the optical imaging system is too high, and the market competitiveness is poor.
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; a second lens having a negative refractive power; a third lens element with negative refractive power having a concave object-side surface and a concave image-side surface; a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a sixth lens having positive refractive power; a seventh lens having a negative refractive power; an eighth lens having positive refractive power; the optical imaging system satisfies: f4/f5 is more than or equal to 0.8 and less than or equal to 2.0, wherein f4 is the effective focal length of the fourth 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 includes a ninth lens having a negative refractive power, the ninth lens being disposed between the object side and the first lens.
According to an exemplary embodiment of the present utility model, the object-side surface of the first lens element is convex, and the image-side surface is concave; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface is a concave surface; the eighth lens element has a convex object-side surface and a convex image-side surface.
According to an exemplary embodiment of the present application, the sixth lens is configured as a cemented lens, and includes a negative lens having a convex surface facing the object side and a positive lens having a biconvex shape.
According to an exemplary embodiment of the present application, the object-side surface of the ninth lens element is convex and the image-side surface is concave.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: -1.3 ∈d/f9 ∈0.1, where D is the maximum light transmission aperture of the optical imaging system and f9 is the effective focal length of the ninth lens.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: 1.3.ltoreq.f9/f.ltoreq.10.8, wherein f9 is the effective focal length of the ninth lens, and f is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: R91/R92 is less than or equal to 1.0 and less than or equal to 2.5, wherein R91 is the curvature radius of the object side surface of the ninth lens, and R92 is the curvature radius of the image side surface of the ninth lens.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: -9.6.ltoreq.f1/f.ltoreq.4.8, 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 application, the optical imaging system further satisfies: -4.5.ltoreq.f2/f.ltoreq.2.0, where 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 application, the optical imaging system further comprises a diaphragm, and the optical imaging system further fulfils: and f3/fa is more than or equal to 1.8 and less than or equal to 2.8, wherein the effective focal length of the f3 third lens is the effective focal length of the lens group before the diaphragm.
According to an exemplary embodiment of the application, the optical imaging system further comprises a diaphragm, and the optical imaging system further fulfils: -4.5 < f4/fa < 2.5, wherein f4 is the effective focal length of the fourth lens and fa is the effective focal length of the lens group before the diaphragm.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: 2.2.ltoreq.f6/f.ltoreq.5.2, wherein f6 is the effective focal length of the sixth lens, and f is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: -3.5.ltoreq.f7/f.ltoreq.1.5, wherein f7 is the effective focal length of the seventh lens, f being the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: and f8/f is more than or equal to 2.1 and less than or equal to 3.8, wherein f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the application, the optical imaging system further comprises a diaphragm, and the optical imaging system further fulfils: -1.5 < fa/f < 0.8, where fa is the effective focal length of the lens group before the stop and f is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the application, the optical imaging system further comprises a diaphragm, and the optical imaging system further fulfils: 2.0.ltoreq.fb/f.ltoreq.3.5, wherein fb is the effective focal length of the lens group behind the diaphragm, and f is the total effective focal length of the optical imaging system.
According to an exemplary embodiment of the application, the optical imaging system further comprises a diaphragm, and the optical imaging system further fulfils: -0.6 < fa/fb < 0.3, where fa is the effective focal length of the lens group before the stop and fb is the effective focal length of the lens group after the stop.
According to an exemplary embodiment of the application, the optical imaging system further comprises a diaphragm, and the optical imaging system further fulfils: T4S/TTL is more than or equal to 0 and less than or equal to 0.1, wherein T4S is the air interval between the fourth lens and the diaphragm on the optical axis, and TTL is the total optical length of the optical imaging system.
According to an exemplary embodiment of the application, the optical imaging system further comprises a diaphragm, and the optical imaging system further fulfils: T34/T4S is more than or equal to 0.2 and less than or equal to 1.2, wherein T34 is the air interval of the third lens and the fourth lens on the optical axis, and T4S is the air interval of the fourth lens and the diaphragm on the optical axis.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: and (R21-R22)/(R21+R22) is less than or equal to 0.1 and less than or equal to 1.2, wherein R21 is the curvature radius of the object side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: T45/(CT4+CT5) is less than or equal to 0 and less than or equal to 0.1, wherein CT4 is the center thickness of the fourth lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: FOV/H/D is not more than 1.5 and not more than 2.8, wherein FOV is the maximum field angle of the optical imaging system, H is the image height of the optical imaging system under the maximum field angle, and D is the maximum light transmission caliber of the optical imaging system.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: f/ENPD is more than or equal to 1.6 and less than or equal to 1.9, wherein f is the total effective focal length of the optical imaging system, and ENPD is the entrance pupil diameter of the optical imaging system.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: D8/H is more than or equal to 0.2 and less than or equal to 1.5, wherein D8 is the maximum aperture of the eighth lens, and H is the image height of the optical imaging system under the maximum field angle.
According to an exemplary embodiment of the present application, the optical imaging system further satisfies: BFL is equal to or less than 0.05 and TTL is equal to or less than 0.2, wherein BFL is the back focal length of the optical imaging system, and TTL is the total optical length of the optical imaging system.
The application adopts nine lenses, and can ensure that the optical imaging lens can meet the use of high and low temperature environments by reasonably distributing the refractive power, the surface shape, the thickness, the interval, the reasonable parameter setting and the like of each lens, and realize at least one beneficial effect of high resolution (twenty-five million pixels), large field of view (FOV=196°), large aperture (FNO is less than or equal to 1.8), high and low temperature non-virtual focus and the like.
Drawings
Other features, objects and advantages of the present application 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 application;
fig. 2 shows a schematic configuration diagram of an optical imaging system according to embodiment 2 of the present application;
fig. 3 shows a schematic configuration diagram of an optical imaging system according to embodiment 3 of the present application;
fig. 4 shows a schematic configuration diagram of an optical imaging system according to embodiment 4 of the present application; and
Fig. 5 shows a schematic configuration diagram of an optical imaging system according to embodiment 5 of the present application.
Detailed Description
For a better understanding of the application, various aspects of the application 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 application and is not intended to limit the scope of the application 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 application 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 application and features of the embodiments may be combined with each other. The application 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 application may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, 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 eighth lenses.
In an exemplary embodiment, the first lens may have a negative refractive power. The object-side surface of the first lens element may be convex, and the image-side surface thereof may be concave. By arranging the first lens in the structure, the incident angle of light on the object side surface of the second lens can be reduced, advanced aberration generated by the rear lens due to overlarge incident angle is avoided, and the image quality of the optical imaging system is improved.
In an exemplary embodiment, the second lens may have a negative refractive power. The object-side surface of the second lens element may be convex, and the image-side surface may be concave. The second lens may be an aspherical lens. By arranging the second lens in the above structural form, the aberration of the optical imaging system in the central field area can be effectively corrected, and the large aperture of the optical imaging system can be realized.
In an exemplary embodiment, the third lens may have a negative refractive power. The object-side surface of the third lens element may be concave, and the image-side surface may be concave. The third lens may be an aspherical lens. By setting the third lens in the above-described structural form, aberration of the optical imaging system in the central field of view region can be effectively corrected, and a large aperture of the optical imaging system can be advantageously realized.
In an exemplary embodiment, the fourth lens may have a positive refractive power. The fourth lens element may have a convex object-side surface and a concave image-side surface. The fourth lens may be an aspherical lens. By setting the fourth lens in the above-described structural form, aberration of the optical imaging system in the central field of view region can be effectively corrected, and a large aperture of the optical imaging system can be advantageously realized.
In an exemplary embodiment, the fifth lens may have a positive refractive power. The object side surface of the fifth lens element may be convex, and the image side surface of the fifth lens element may be convex. By arranging the fifth lens in the structural form and matching with the aspheric design of the fifth lens, the residual astigmatism of the front lens can be effectively corrected. By arranging the fifth lens into the structural form and matching with the spherical design of the fifth lens, the material with stable thermal expansion is selected, so that the thermal compensation of the optical imaging system is realized.
In an exemplary embodiment, the sixth lens may have a positive refractive power. The object-side surface of the sixth lens element may be convex, and the image-side surface of the sixth lens element may be convex. By arranging the sixth lens in the structure form, the converging of light is facilitated.
In an exemplary embodiment, the sixth lens may be configured as a cemented lens having a positive refractive power, specifically including one negative lens and one positive lens, and an image side surface of the negative lens may be cemented with an object side surface of the positive lens. The object side surface of the negative lens can be a convex surface, and the image side surface can be a concave surface; the object-side surface of the positive lens may be convex, and the image-side surface may be convex. By providing the sixth lens as a cemented lens, tolerance sensitivity of the optical imaging system can be reduced, and the negative lens employs a material with a high refractive index and a low abbe number and the positive lens employs a material with a low refractive index and a high abbe number, which is advantageous in correcting chromatic aberration of the optical imaging system and improving imaging quality of the optical imaging system.
In an exemplary embodiment, the seventh lens may have a negative refractive power. The object-side surface of the seventh lens element may be concave, and the image-side surface may be concave. By arranging the seventh lens in the structural form, not only can the spherical aberration and the coma aberration generated by the sixth lens be compensated, but also the residual astigmatism generated by all the lenses in front can be compensated, and the imaging quality of the optical imaging system can be improved.
In an exemplary embodiment, the eighth lens may have positive refractive power. The object-side surface of the eighth lens element may be convex, and the image-side surface of the eighth lens element may be convex. By setting the eighth lens to the above-described structural form, it is advantageous to reduce the Chief Ray Angle (CRA) of the optical imaging lens so as to satisfy the CRA curve requirement of the rear chip. The CRA of the optical imaging lens may be, for example, 10 ° or less.
In an exemplary embodiment, the optical imaging system may further include a ninth lens disposed between the object side and the first lens. The ninth lens may have a negative refractive power. The object-side surface of the ninth lens element may be convex, and the image-side surface thereof may be concave. By arranging the ninth lens in the above structural form, the incident angle of the light on the object side surface of the first lens can be reduced, and the light can smoothly enter the rear of the system, which is beneficial to correcting the rear group aberration. As an example, the ninth lens may be, for example, a cover glass or an integral optical architecture.
In an exemplary embodiment, the optical imaging system may further include a diaphragm. The diaphragm may be disposed, for example, between the fourth lens and the fifth lens. All lenses between the object side and the diaphragm constitute a lens group before the diaphragm. All lenses between the image side and the diaphragm constitute a diaphragm rear lens group.
In an exemplary embodiment, the optical imaging system may further satisfy: -1.3 ∈d/f9 ∈0.1, where D is the maximum light transmission aperture of the optical imaging system and f9 is the effective focal length of the ninth lens. And the correlation between the maximum light transmission caliber of the optical imaging system and the effective focal length of the ninth lens is reasonably controlled, so that large-angle light rays can enter the system, and the field angle of the optical imaging system is increased. The maximum field angle FOV of the optical imaging system may be 196 ° for example.
In an exemplary embodiment, the optical imaging system may further satisfy: 1.3.ltoreq.f9/f.ltoreq.10.8, wherein f9 is the effective focal length of the ninth lens, and f is the total effective focal length of the optical imaging system. And the correlation between the effective focal length of the ninth lens and the total effective focal length of the optical imaging system is reasonably controlled, so that the spherical aberration and the coma aberration of the optical imaging system are reduced.
In an exemplary embodiment, the optical imaging system may further satisfy: R91/R92 is less than or equal to 1.0 and less than or equal to 2.5, wherein R91 is the curvature radius of the object side surface of the ninth lens, and R92 is the curvature radius of the image side surface of the ninth lens. The shapes of the object side surface and the image side surface of the ninth lens are reasonably controlled, so that the collection of large-angle light rays is facilitated, the large-angle light rays enter the system, and the caliber and the volume of the front end of the optical imaging system are further reduced.
In an exemplary embodiment, the optical imaging system may further satisfy: -9.6.ltoreq.f1/f.ltoreq.4.8, 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 the first lens can play a role of diverging light, the light trend is enabled to be in smooth transition, large-angle light can enter the rear lens 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: -4.5.ltoreq.f2/f.ltoreq.2.0, where f2 is the effective focal length of the second lens and f is the total effective focal length of the optical imaging system. 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 second lens can play a role of diverging light, the light trend is enabled to be in smooth transition, large-angle light can enter the rear lens 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: and f3/fa is more than or equal to 1.8 and less than or equal to 2.8, wherein the effective focal length of the f3 third lens is the effective focal length of the lens group before the diaphragm. And the correlation between the effective focal length of the third lens and the effective focal length of the lens group before the diaphragm is reasonably controlled, so that the astigmatism of the whole optical imaging system can be corrected.
In an exemplary embodiment, the optical imaging system may further satisfy: -4.5 < f4/fa < 2.5, wherein f4 is the effective focal length of the fourth lens and fa is the effective focal length of the lens group before the diaphragm. And the correlation between the effective focal length of the fourth lens and the effective focal length of the lens group before the diaphragm is reasonably controlled, so that the astigmatism of the whole optical imaging system can be corrected.
In an exemplary embodiment, the optical imaging system may further satisfy: f4/f5 is more than or equal to 0.8 and less than or equal to 2.0, wherein f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. The interrelationship between the effective focal length of the fourth lens and the effective focal length of the fifth lens is reasonably controlled, so that the aberration of the optical imaging system in the central field area can be effectively corrected, and the thermal compensation of the optical imaging system is realized, thereby ensuring that the optical imaging system has good temperature performance and reducing the cost of the optical imaging system.
In an exemplary embodiment, the optical imaging system may further satisfy: 2.2.ltoreq.f6/f.ltoreq.5.2, wherein f6 is the effective focal length of the sixth lens, and f is the total effective focal length of the optical imaging system. When the sixth lens is a thick lens, the astigmatism generated by the sixth lens can be avoided by controlling the effective focal length value of the sixth lens; when the sixth lens is a cemented lens, chromatic aberration of the optical imaging system can be effectively corrected by controlling the effective focal length value of the sixth lens.
In an exemplary embodiment, the optical imaging system may further satisfy: -3.5.ltoreq.f7/f.ltoreq.1.5, wherein f7 is the effective focal length of the seventh lens, f being the total effective focal length of the optical imaging system. And 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 astigmatism generated by each positive lens in the diaphragm rear group lens is balanced.
In an exemplary embodiment, the optical imaging system may further satisfy: and f8/f is more than or equal to 2.1 and less than or equal to 3.8, wherein f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the optical imaging system. And the correlation between the effective focal length of the eighth lens and the total effective focal length of the optical imaging system is reasonably controlled, so that the maximum field principal ray emitted by the seventh lens is favorably turned over, and the image height of the optical imaging system is ensured to meet the requirement.
In an exemplary embodiment, the optical imaging system may further satisfy: -1.5 < fa/f < 0.8, where fa is the effective focal length of the lens group before the stop and f is the total effective focal length of the optical imaging system. The interrelation between the effective focal length of the lens group before the diaphragm and the total effective focal length of the optical imaging system is reasonably controlled, which is favorable for controlling the light trend, reducing the sensitivity of the optical imaging system and improving the imaging quality of the optical imaging system.
In an exemplary embodiment, the optical imaging system may further satisfy: 2.0.ltoreq.fb/f.ltoreq.3.5, wherein fb is the effective focal length of the lens group behind the diaphragm, and f is the total effective focal length of the optical imaging system. The interrelation between the effective focal length of the lens group and the total effective focal length of the optical imaging system after the diaphragm is reasonably controlled, thereby being beneficial to controlling the light trend, reducing the sensitivity of the optical imaging system and improving the imaging quality of the optical imaging system.
In an exemplary embodiment, the optical imaging system may further satisfy: -0.6 < fa/fb < 0.3, where fa is the effective focal length of the lens group before the stop and fb is the effective focal length of the lens group after the stop. The correlation between the effective focal length of the lens group before the diaphragm and the effective focal length of the lens group after the diaphragm is reasonably controlled, so that the refractive powers of the lens group before the diaphragm and the lens group after the diaphragm are reasonably matched, the control of the light trend is facilitated, the light trend is more gentle, the sensitivity of an optical imaging system is reduced, and the imaging quality of the optical imaging system is improved.
In an exemplary embodiment, the optical imaging system may further satisfy: T4S/TTL is more than or equal to 0 and less than or equal to 0.1, wherein T4S is the air interval between the fourth lens and the diaphragm on the optical axis, and TTL is the total optical length of the optical imaging system. The interrelation between the air interval of the fourth lens and the diaphragm on the optical axis and the total optical length of the optical imaging system is reasonably controlled, so that light rays near the diaphragm can be smoothly transited, and the high resolution of the optical imaging system is realized.
In an exemplary embodiment, the optical imaging system may further satisfy: T34/T4S is more than or equal to 0.2 and less than or equal to 1.2, wherein T34 is the air interval of the third lens and the fourth lens on the optical axis, and T4S is the air interval of the fourth lens and the diaphragm on the optical axis. And the mutual relation between the air interval of the third lens and the fourth lens on the optical axis and the air interval of the fourth lens and the diaphragm on the optical axis is reasonably controlled, so that the coma aberration of the optical imaging system is corrected, and the tolerance sensitivity of the optical imaging system is reduced.
In an exemplary embodiment, the optical imaging system may further satisfy: and (R21-R22)/(R21+R22) is less than or equal to 0.1 and less than or equal to 1.2, wherein R21 is the curvature radius of the object side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens. The interrelationship between the curvature radius of the object side surface of the second lens and the curvature radius of the image side surface of the second lens is reasonably controlled, so that the light emitted from the second lens can be ensured to be more gentle when entering the object side surface of the third lens, and the tolerance sensitivity of the optical imaging system is reduced.
In an exemplary embodiment, the optical imaging system may further satisfy: T45/(CT4+CT5) is less than or equal to 0 and less than or equal to 0.1, wherein CT4 is the center thickness of the fourth lens on the optical axis, T45 is the air interval between the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis. The central thickness of the fourth lens on the optical axis, the air interval of the fourth lens and the fifth lens on the optical axis and the central thickness of the fifth lens on the optical axis are reasonably controlled, so that the characteristics of eliminating temperature drift of the optical imaging system can be better realized, and the coma aberration, astigmatism and other off-axis aberration of the optical imaging system can be effectively corrected.
In an exemplary embodiment, the optical imaging system may further satisfy: FOV/H/D is not more than 1.5 and not more than 2.8, wherein FOV is the maximum field angle of the optical imaging system, H is the image height of the optical imaging system under the maximum field angle, and D is the maximum light transmission caliber of the optical imaging system. The maximum field angle, the image height and the maximum light-transmitting caliber of the optical imaging system are reasonably controlled, the viewpoint position of the optical imaging system can be effectively restrained, the light-transmitting caliber is ensured to meet the design requirement, and the shorter the focal length is, the larger the field angle is, and the smaller the opposite is; meanwhile, the optical imaging system can have reasonable field angles when corresponding to different sensors.
In an exemplary embodiment, the optical imaging system may further satisfy: f/ENPD is more than or equal to 1.6 and less than or equal to 1.9, wherein f is the total effective focal length of the optical imaging system, and ENPD is the entrance pupil diameter of the optical imaging system. The correlation between the total effective focal length of the optical imaging system and the diameter of the entrance pupil of the optical imaging system is reasonably controlled, so that the large aperture of the optical imaging system is realized, the light flux of the optical imaging system is increased, and the imaging brightness and contrast of the optical imaging system are improved.
In an exemplary embodiment, the optical imaging system may further satisfy: D8/H is more than or equal to 0.2 and less than or equal to 1.5, wherein D8 is the maximum aperture of the eighth lens, and H is the image height of the optical imaging system under the maximum field angle. The correlation between the maximum light transmission caliber of the eighth lens and the image height of the optical imaging system under the maximum field angle is reasonably controlled, so that the light rays emitted from the eighth lens can be smoothly transited to an image plane, the inclination angle (CRA) of principal rays is reduced, and the tolerance and manufacturability of the optical imaging system are improved.
In an exemplary embodiment, the optical imaging system may further satisfy: BFL is equal to or less than 0.05 and TTL is equal to or less than 0.2, wherein BFL is the back focal length of the optical imaging system, and TTL is the total optical length of the optical imaging system. The correlation between the back focal length of the optical imaging system and the total optical length of the optical imaging system is reasonably controlled, so that the miniaturization of the optical imaging system is facilitated, and the ghost image energy generated by the central reflection of the optical imaging system and the optical filter is reduced.
The optical imaging system according to the above embodiment of the present application may employ a plurality of lenses, for example, the above nine lenses, and at least one of a large field of view, a large aperture, high resolution, miniaturization, high and low temperature non-virtual focus of the optical imaging system can be realized by reasonably distributing optical parameters such as refractive power of each lens, surface thickness of each lens, and on-axis spacing between each lens. The optical imaging lens provided by the application can be an optical imaging lens with a maximum field angle fov=196°, a relative F number FNO less than or equal to 1.8 and twenty-five million pixels.
In an embodiment of the present application, at least one of the mirror surfaces of each of the first to ninth lenses is an aspherical mirror surface. The aspherical lens is characterized in that: the curvature varies 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 application 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 application 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 application.
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 ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has a negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens element L6 has a positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The seventh lens element L7 has a negative refractive power, wherein an object-side surface S15 thereof is concave, and an image-side surface S16 thereof is concave. The eighth lens element L8 has a positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex. The filter C has an object side surface S19 and an image side surface S20. Light from the object passes sequentially through the respective surfaces S1 to S20 and is finally imaged on the imaging plane IMA. The surfaces S1 to S20 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 embodiment 1, the object side surface and the image side surface of any one of the second lens L2 to the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical surface 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 aspherical mirror surfaces S5 to S10, S11 to S12 which can be used in example 1Cone coefficient k and higher order term coefficient a of S15-S18 4 、A 6 、A 8 、A 10 And A 12 。
| Face number | k | A4 | A6 | A8 | A10 | A12 |
| S5 | 0 | -9.67E-04 | -3.63E-04 | 8.21E-05 | -6.18E-06 | 1.53E-07 |
| S6 | -0.826 | 3.98E-03 | 3.68E-04 | -1.11E-04 | 5.90E-05 | 6.06E-06 |
| S7 | -1.123 | 2.26E-03 | -2.35E-04 | -1.91E-04 | 7.53E-05 | -5.60E-06 |
| S8 | -41.106 | 1.85E-02 | 6.83E-04 | -1.37E-03 | 3.22E-04 | 2.72E-06 |
| S9 | -14.452 | 1.50E-02 | -7.61E-04 | -1.21E-03 | 3.55E-04 | -2.37E-05 |
| S10 | 0 | -1.96E-02 | 1.21E-02 | -3.10E-03 | 2.19E-04 | -6.60E-06 |
| S11 | -25.579 | -1.60E-03 | 5.48E-03 | 2.22E-04 | -5.69E-04 | 8.90E-05 |
| S12 | 1.076 | 3.29E-03 | 2.84E-03 | -1.36E-03 | 7.26E-04 | -1.12E-04 |
| S15 | -4.868 | -8.62E-05 | -1.46E-03 | -1.85E-04 | -7.82E-06 | 8.19E-06 |
| S16 | 0.663 | -3.20E-03 | 2.22E-03 | -3.78E-04 | -1.77E-04 | 3.28E-05 |
| S17 | -0.556 | -1.71E-02 | 3.61E-03 | -4.82E-04 | 3.53E-05 | -2.08E-06 |
| S18 | 1.910 | -7.30E-04 | -6.28E-04 | 1.48E-04 | 8.27E-06 | -2.24E-06 |
TABLE 2
Example 2
An optical imaging system according to embodiment 2 of the present application 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 application.
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 ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has a negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens element L6 has a positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The seventh lens element L7 has a negative refractive power, wherein an object-side surface S15 thereof is concave, and an image-side surface S16 thereof is concave. The eighth lens element L8 has a positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex. The filter C has an object side surface S19 and an image side surface S20. Light from the object passes sequentially through the respective surfaces S1 to S20 and is finally imaged on the imaging plane IMA. The surfaces S1 to S20 are not shown in fig. 1.
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 embodiment 2, the object side surface and the image side surface of any one of the second lens L2 to the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces. Table 4 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S10, S11-S12, S15-S18 used in example 2 4 、A 6 、A 8 、A 10 And A 12 。
| Face number | k | A4 | A6 | A8 | A10 | A12 |
| S5 | 0 | -7.20E-03 | -5.45E-04 | 1.06E-04 | -6.16E-06 | 1.15E-07 |
| S6 | -1.587 | 2.16E-02 | -2.91E-03 | 6.61E-04 | -1.64E-04 | 2.29E-05 |
| S7 | 0.854 | -5.35E-04 | -3.42E-03 | 5.50E-04 | 5.07E-05 | -6.93E-06 |
| S8 | -7.314 | 7.03E-03 | 2.75E-03 | -6.70E-04 | -1.60E-04 | 4.65E-05 |
| S9 | -5.790 | 1.10E-03 | 5.35E-03 | -2.00E-03 | 1.90E-04 | -2.10E-05 |
| S10 | 0 | 1.11E-03 | 4.61E-03 | -2.22E-03 | 9.67E-05 | -1.85E-06 |
| S11 | 1.161 | 5.14E-03 | 4.58E-03 | -1.33E-03 | -5.33E-05 | 3.65E-05 |
| S12 | -0.178 | 7.32E-03 | 2.27E-03 | -9.92E-04 | 8.43E-04 | -1.70E-04 |
| S15 | -3.814 | -3.81E-03 | -3.05E-03 | 7.82E-06 | 2.15E-04 | -5.10E-05 |
| S16 | 0.158 | -8.31E-03 | 6.20E-04 | 3.79E-04 | -1.69E-04 | 1.27E-05 |
| S17 | -0.506 | -1.92E-02 | 3.90E-03 | -3.04E-04 | -1.79E-05 | 8.03E-07 |
| S18 | 0.986 | 1.75E-03 | 4.11E-05 | 1.10E-04 | -4.96E-06 | -5.66E-07 |
TABLE 4 Table 4
Example 3
An optical imaging system according to embodiment 3 of the present application 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 application.
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 ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has a negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens element L6 has a positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is convex. The seventh lens element L7 has a negative refractive power, wherein an object-side surface S15 thereof is concave, and an image-side surface S16 thereof is concave. The eighth lens element L8 has a positive refractive power, and its object-side surface S17 is convex and its image-side surface S18 is convex. The filter C has an object side surface S19 and an image side surface S20. Light from the object passes sequentially through the respective surfaces S1 to S20 and is finally imaged on the imaging plane IMA. The surfaces S1 to S20 are not shown in fig. 1.
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 embodiment 3, the object side surface and the image side surface of any one of the second lens L2 to the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces. Table 6 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S10, S11-S12, S15-S18 used in example 3 4 、A 6 、A 8 、A 10 And A 12 。
| Face number | k | A4 | A6 | A8 | A10 | A12 |
| S5 | 0 | -2.46E-03 | -3.66E-04 | 8.75E-05 | -6.22E-06 | 1.31E-07 |
| S6 | -0.909 | 1.72E-03 | -9.25E-05 | -6.66E-05 | 8.04E-05 | 4.39E-06 |
| S7 | -0.960 | 2.55E-03 | 4.10E-04 | -1.25E-04 | 7.64E-05 | -8.71E-06 |
| S8 | -26.870 | 1.85E-02 | 1.02E-03 | -1.29E-03 | 5.25E-04 | 3.66E-05 |
| S9 | -10.497 | 1.29E-02 | -1.45E-03 | -9.86E-04 | 4.75E-04 | -9.86E-06 |
| S10 | 0 | -2.23E-02 | 1.32E-02 | -2.90E-03 | 8.83E-05 | 1.71E-05 |
| S11 | -35 | -7.41E-04 | 5.99E-03 | 4.04E-04 | -4.79E-04 | 7.67E-05 |
| S12 | 1.127 | 2.26E-03 | 3.73E-03 | -1.54E-03 | 7.59E-04 | -8.13E-05 |
| S15 | -3.720 | 6.26E-06 | -1.56E-03 | -1.25E-04 | 3.93E-06 | 2.95E-06 |
| S16 | 0.509 | -2.73E-03 | 1.98E-03 | -2.75E-04 | -1.18E-04 | 1.79E-05 |
| S17 | -0.696 | -1.82E-02 | 3.29E-03 | -4.94E-04 | 5.94E-05 | -6.42E-06 |
| S18 | 2.856 | -6.06E-04 | -1.13E-03 | 1.58E-04 | 1.12E-05 | -2.37E-06 |
TABLE 6
Example 4
An optical imaging system according to embodiment 4 of the present application 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 application.
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 ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has a negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens is a cemented lens including a negative lens L61 and a positive lens L62; the object side surface S13 of the negative lens L61 is convex, and the image side surface S14 is concave; the object side surface of the positive lens L62 is convex, and the image side surface S15 is convex. The seventh lens element L7 has a negative refractive power, wherein an object-side surface S16 thereof is concave, and an image-side surface S17 thereof is concave. The eighth lens element L8 has a positive refractive power, and its object-side surface S18 is convex and its image-side surface S19 is convex. The filter C has an object side surface S20 and an image side surface S21. Light from the object passes sequentially through the respective surfaces S1 to S21 and is finally imaged on the imaging plane IMA. The surfaces S1 to S21 are not shown in fig. 1.
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).
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TABLE 7
In embodiment 4, the object side surface and the image side surface of any one of the second lens L2 to the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces. Table 8 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S10, S11-S12, S16-S19 used in example 4 4 、A 6 、A 8 、A 10 And A 12 。
| Face number | k | A4 | A6 | A8 | A10 | A12 |
| S5 | 0 | 4.04E-03 | -6.01E-04 | 7.15E-05 | -4.16E-06 | 9.68E-08 |
| S6 | -1.827 | 1.15E-02 | 1.32E-03 | -6.68E-04 | 1.31E-04 | 7.25E-06 |
| S7 | 0.123 | -1.41E-03 | 2.52E-03 | -4.68E-04 | 9.01E-05 | -8.89E-06 |
| S8 | -13.893 | 3.07E-02 | -1.73E-03 | -9.78E-05 | 9.00E-05 | 5.01E-05 |
| S9 | -4.964 | 1.61E-02 | -7.71E-04 | -7.05E-04 | 2.03E-04 | -8.17E-07 |
| S10 | 0 | -1.11E-02 | 1.50E-02 | -3.88E-03 | 2.39E-04 | 2.80E-05 |
| S11 | -30.210 | 7.67E-03 | 2.08E-03 | 2.61E-04 | -4.17E-04 | 5.74E-05 |
| S12 | 0.326 | 5.76E-04 | 2.64E-03 | -1.37E-03 | 5.03E-04 | -6.84E-05 |
| S16 | -9.044 | 1.04E-04 | -1.33E-03 | 2.18E-05 | -7.18E-05 | 1.55E-06 |
| S17 | 0.212 | -6.72E-03 | 1.59E-03 | -1.23E-04 | -1.07E-04 | 1.26E-05 |
| S18 | -0.782 | -1.94E-02 | 3.60E-03 | -4.81E-04 | 4.84E-05 | -3.33E-06 |
| S19 | 1.775 | 1.24E-02 | -2.61E-03 | 2.35E-04 | 2.86E-06 | 1.05E-06 |
TABLE 8
Example 5
An optical imaging system according to embodiment 5 of the present application 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 application.
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 ninth lens L9, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens, a seventh lens L7, and an eighth lens L8. The stop STO may be disposed between the fourth lens L4 and the fifth lens L5.
The ninth lens element L9 has a negative refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The first lens element L1 has a negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The second lens element L2 has a negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The third lens element L3 has a negative refractive power, wherein an object-side surface S7 thereof is concave, and an image-side surface S8 thereof is concave. The fourth lens element L4 has a positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The fifth lens element L5 has a positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is convex. The sixth lens is a cemented lens including a negative lens L61 and a positive lens L62; the object side surface S13 of the negative lens L61 is convex, and the image side surface S14 is concave; the object side surface of the positive lens L62 is convex, and the image side surface S15 is convex. The seventh lens element L7 has a negative refractive power, wherein an object-side surface S16 thereof is concave, and an image-side surface S17 thereof is concave. The eighth lens element L8 has a positive refractive power, and its object-side surface S18 is convex and its image-side surface S19 is convex. The filter C has an object side surface S20 and an image side surface S21. Light from the object passes sequentially through the respective surfaces S1 to S21 and is finally imaged on the imaging plane IMA. The surfaces S1 to S21 are not shown in fig. 1.
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 embodiment 5, the object side surface and the image side surface of any one of the second lens L2, the third lens L3, the fifth lens L5, the seventh lens L7, and the eighth lens L8 are aspherical surfaces. Table 10 shows the cone coefficients k and the higher order coefficients A for the aspherical mirror surfaces S5-S8, S11-S12, S16-S19 used in example 5 4 、A 6 、A 8 、A 10 And A 12 。
| Face number | k | A4 | A6 | A8 | A10 | A12 |
| S5 | 0 | -1.69E-03 | -5.17E-04 | 7.73E-05 | -4.06E-06 | 7.78E-08 |
| S6 | -1.499 | 1.07E-02 | -8.33E-04 | -8.30E-04 | 1.98E-04 | -7.09E-06 |
| S7 | -0.064 | -5.71E-04 | 2.95E-03 | -6.03E-04 | 7.11E-05 | -4.60E-06 |
| S8 | -9.016 | 3.13E-02 | -1.53E-03 | 4.00E-04 | -1.26E-04 | 7.43E-06 |
| S11 | -7.397 | 9.81E-03 | 1.33E-03 | 8.91E-05 | -8.25E-06 | 6.56E-05 |
| S12 | -0.859 | 2.64E-03 | 3.81E-03 | -1.23E-03 | 4.31E-04 | 4.00E-05 |
| S16 | -7.892 | 3.79E-05 | -1.75E-03 | -2.42E-05 | -2.39E-05 | 1.68E-05 |
| S17 | 0.134 | -7.86E-03 | 1.60E-03 | -5.06E-05 | -8.95E-05 | 1.39E-05 |
| S18 | -0.997 | -2.08E-02 | 3.70E-03 | -4.48E-04 | 5.62E-05 | -4.62E-06 |
| S19 | 1.549 | 1.01E-02 | -2.45E-03 | 3.25E-04 | 7.12E-06 | -3.92E-07 |
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 |
| D/f9 | -0.406 | -0.277 | -1.093 | -0.444 | -0.312 |
| f9/f | 6.848 | 10.556 | 1.504 | 5.505 | 7.213 |
| R91/R92 | 1.409 | 1.358 | 2.052 | 1.368 | 1.329 |
| f1/f | -5.602 | -5.159 | -7.959 | -7.520 | -9.099 |
| f2/f | -2.598 | -4.153 | -3.906 | -3.029 | -3.309 |
| f3/fa | 2.375 | 2.254 | 2.460 | 2.215 | 2.093 |
| f4/fa | -3.780 | -4.274 | -3.809 | -3.019 | -2.976 |
| f4/f5 | 1.437 | 1.604 | 1.303 | 1.256 | 1.006 |
| f6/f | 2.922 | 2.691 | 2.946 | 4.829 | 4.550 |
| f7/f | -1.942 | -1.827 | -2.094 | -2.411 | -3.158 |
| f8/f | 2.774 | 2.526 | 2.916 | 2.822 | 2.972 |
| fa/f | -1.094 | -1.093 | -1.078 | -1.158 | -1.375 |
| fb/f | 2.399 | 2.378 | 2.434 | 2.778 | 3.076 |
| fa/fb | -0.456 | -0.459 | -0.443 | -0.417 | -0.447 |
| T4S/TTL | 0.010 | 0.012 | 0.008 | 0.009 | 0.009 |
| T34/T4S | 0.336 | 0.495 | 0.432 | 0.368 | 0.853 |
| (R21-R22)/(R21+R22) | 0.670 | 0.408 | 0.571 | 0.940 | 0.658 |
| T45/(CT4+CT5) | 0.024 | 0.020 | 0.017 | 0.026 | 0.016 |
| FOV/H/D | 1.839 | 1.899 | 2.328 | 1.828 | 1.775 |
| f/ENPD | 1.80 | 1.76 | 1.80 | 1.80 | 1.78 |
| D8/H | 1.113 | 1.056 | 0.527 | 1.019 | 1.022 |
| BFL/TTL | 0.091 | 0.100 | 0.091 | 0.091 | 0.091 |
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 (26)
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;
a second lens having a negative refractive power;
a third lens element with negative refractive power having a concave object-side surface and a concave image-side surface;
a fourth lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a fifth lens element with positive refractive power having a convex object-side surface and a convex image-side surface;
a sixth lens having positive refractive power;
a seventh lens having a negative refractive power; and
an eighth lens having positive refractive power;
the optical imaging system satisfies: f4/f5 is more than or equal to 0.8 and less than or equal to 2.0,
wherein f4 is an effective focal length of the fourth lens, and f5 is an effective focal length of the fifth lens.
2. The optical imaging system of claim 1, further comprising a ninth lens having a negative refractive power, the ninth lens disposed between the object side and the first lens.
3. The optical imaging system of claim 1 or 2, wherein the object-side surface of the first lens is convex and the image-side surface is concave; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface is a concave surface; the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface.
4. The optical imaging system according to claim 1 or 2, wherein the sixth lens is configured as a cemented lens, and includes a negative lens having one convex surface facing the object side and a positive lens having a biconvex shape.
5. The optical imaging system of claim 2, wherein the object-side surface of the ninth lens is convex and the image-side surface is concave.
6. The optical imaging system of claim 2, wherein the optical imaging system further satisfies:
-1.3≤D/f9≤-0.1，
wherein D is the maximum aperture of the optical imaging system, and f9 is the effective focal length of the ninth lens.
7. The optical imaging system of claim 2, wherein the optical imaging system further satisfies:
1.3≤f9/f≤10.8，
wherein f9 is the effective focal length of the ninth lens, and f is the total effective focal length of the optical imaging system.
8. The optical imaging system of claim 2, wherein the optical imaging system further satisfies:
1.0≤R91/R92≤2.5，
wherein R91 is a radius of curvature of an object side surface of the ninth lens, and R92 is a radius of curvature of an image side surface of the ninth lens.
9. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
-9.6≤f1/f≤-4.8，
Wherein f1 is the effective focal length of the first lens, and f is the total effective focal length of the optical imaging system.
10. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
-4.5≤f2/f≤-2.0，
wherein f2 is the effective focal length of the second lens, and f is the total effective focal length of the optical imaging system.
11. The optical imaging system of claim 1 or 2, wherein the optical imaging system further comprises a diaphragm, and the optical imaging system further satisfies:
1.8≤f3/fa≤2.8，
and f3, wherein fa is the effective focal length of the lens group before the diaphragm.
12. The optical imaging system of claim 1 or 2, wherein the optical imaging system further comprises a diaphragm, and the optical imaging system further satisfies:
-4.5≤f4/fa≤-2.5，
wherein f4 is the effective focal length of the fourth lens, and fa is the effective focal length of the lens group before the diaphragm.
13. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
2.2≤f6/f≤5.2，
wherein f6 is the effective focal length of the sixth lens, and f is the total effective focal length of the optical imaging system.
14. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
-3.5≤f7/f≤-1.5，
Wherein f7 is the effective focal length of the seventh lens, and f is the total effective focal length of the optical imaging system.
15. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
2.1≤f8/f≤3.8，
wherein f8 is the effective focal length of the eighth lens, and f is the total effective focal length of the optical imaging system.
16. The optical imaging system of claim 1 or 2, wherein the optical imaging system further comprises a diaphragm, and the optical imaging system further satisfies:
-1.5≤fa/f≤-0.8，
where fa is the effective focal length of the lens group before the diaphragm and f is the total effective focal length of the optical imaging system.
17. The optical imaging system of claim 1 or 2, wherein the optical imaging system further comprises a diaphragm, and the optical imaging system further satisfies:
2.0≤fb/f≤3.5，
wherein fb is the effective focal length of the lens group behind the diaphragm, and f is the total effective focal length of the optical imaging system.
18. The optical imaging system of claim 1 or 2, wherein the optical imaging system further comprises a diaphragm, and the optical imaging system further satisfies:
-0.6≤fa/fb≤-0.3，
where fa is the effective focal length of the lens group before the stop and fb is the effective focal length of the lens group after the stop.
19. The optical imaging system of claim 1 or 2, wherein the optical imaging system further comprises a diaphragm, and the optical imaging system further satisfies:
0≤T4S/TTL≤0.1，
wherein T4S is an air space between the fourth lens and the diaphragm on the optical axis, and TTL is an optical total length of the optical imaging system.
20. The optical imaging system of claim 1 or 2, wherein the optical imaging system further comprises a diaphragm, and the optical imaging system further satisfies:
0.2≤T34/T4S≤1.2，
wherein T34 is an air space between the third lens and the fourth lens on the optical axis, and T4S is an air space between the fourth lens and the diaphragm on the optical axis.
21. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
0.1≤(R21-R22)/(R21+R22)≤1.2，
wherein R21 is a radius of curvature of an object side surface of the second lens, and R22 is a radius of curvature of an image side surface of the second lens.
22. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
0≤T45/(CT4+CT5)≤0.1，
wherein, CT4 is the center thickness of the fourth lens on the optical axis, T45 is the air space between the fourth lens and the fifth lens on the optical axis, and CT5 is the center thickness of the fifth lens on the optical axis.
23. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
1.5≤FOV/H/D≤2.8，
wherein, FOV is the maximum angle of view of the optical imaging system, H is the image height of the optical imaging system under the maximum angle of view, and D is the maximum aperture of light passing through the optical imaging system.
24. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
1.6≤f/ENPD≤1.9，
where f is the total effective focal length of the optical imaging system and ENPD is the entrance pupil diameter of the optical imaging system.
25. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
0.2≤D8/H≤1.5，
wherein D8 is the maximum aperture of the eighth lens, and H is the image height of the optical imaging system at the maximum angle of view.
26. The optical imaging system according to claim 1 or 2, characterized in that the optical imaging system further satisfies:
0.05≤BFL/TTL≤0.2，
wherein BFL is the back focal length of the optical imaging system, and TTL is the total optical length of the optical imaging system.
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