CN220085151U - Wide-angle lens - Google Patents
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- CN220085151U CN220085151U CN202321281279.6U CN202321281279U CN220085151U CN 220085151 U CN220085151 U CN 220085151U CN 202321281279 U CN202321281279 U CN 202321281279U CN 220085151 U CN220085151 U CN 220085151U
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Abstract
The utility model discloses a wide-angle lens, 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 optical power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with positive refractive power having a convex object-side surface; and a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface, wherein the wide-angle lens element satisfies: F3/F is less than or equal to 1.6 and less than or equal to 3.2, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the wide-angle lens.
Description
Technical Field
The utility model relates to the field of optical devices, in particular to a seven-piece wide-angle lens.
Background
Since the wide-angle lens has the characteristics of large shooting range and more picture contents, the wide-angle lens can be applied to fields with special requirements on imaging range, such as fields of a moving camera, an unmanned aerial vehicle, a vehicle-mounted image, conference video equipment and the like. As the demand for wide-angle lenses in these fields increases, the imaging quality requirements for wide-angle lenses are increasing.
The wide-angle lens in the fields has wide application scenes, can be used in complex environments such as severe vibration, high pressure or high and low temperature, has higher performance requirements, has good thermal stability to cope with changeable use environments such as high and low temperature, has smaller volume and weight, and can be matched with a chip with high pixels to meet the application in different use scenes. However, the performance of the conventional wide-angle lens in the above complex environment is poor, and it is difficult to satisfy the use requirements of the above complex environment.
Disclosure of Invention
The present utility model provides a wide-angle lens that at least solves or partially solves at least one problem, or other problems, found in the prior art.
An aspect of the present utility model provides a wide-angle lens 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 optical power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface; a sixth lens element with positive refractive power having a convex object-side surface; and a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface, wherein the wide-angle lens element satisfies: F3/F is less than or equal to 1.6 and less than or equal to 3.2, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the wide-angle 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 image side surface of the third lens is a convex surface; the fourth lens element has a convex object-side surface and a convex image-side surface.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: -1.4 +.Df1 +.0.5, where D is the maximum optical aperture of the wide angle lens and F1 is the effective focal length of the first lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: -3.0.ltoreq.F1/F.ltoreq.1.5, wherein F1 is the effective focal length of the first lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens satisfies: -0.2 +.ltoreq.R21-R22)/(R21+R22) +.0.3, where R21 is the radius of curvature of the object-side of the second lens and R22 is the radius of curvature of the image-side of the second lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: F4/F is more than or equal to 1.3 and less than or equal to 2.5, wherein F4 is the effective focal length of the fourth lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: -7.6.ltoreq.F5/F.ltoreq.4.5, wherein F5 is the effective focal length of the fifth lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: F6/F is more than or equal to 2.5 and less than or equal to 12.0, wherein F6 is the effective focal length of the sixth lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: -1.9.ltoreq.F7/F.ltoreq.1.0, wherein F7 is the effective focal length of the seventh lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: F7/F1 is more than or equal to 0.2 and less than or equal to 1.1, wherein F1 is the effective focal length of the first lens, and F7 is the effective focal length of the seventh lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: F34/F is more than or equal to 0.7 and less than or equal to 1.4, wherein F34 is the combined focal length of the third lens and the fourth lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: F12/F67 is more than or equal to 0.4 and less than or equal to 1.3, wherein F12 is the combined focal length of the first lens and the second lens, and F67 is the combined focal length of the sixth lens and the seventh lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: sigma CT is equal to or more than 0.3 and TTL is equal to or less than 0.9, wherein Sigma CT is the sum of the thicknesses of the centers of the first lens and the seventh lens on the optical axis, and TTL is the total optical length of the wide-angle lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: ET1/CT1 is 1.2.ltoreq.3.2, wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: R11/CT1 is more than or equal to 9.0 and less than or equal to 30.1, wherein R11 is the curvature radius of the object side surface of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: T12/TTL is more than or equal to 0 and less than or equal to 0.3, wherein T12 is the air interval between the first lens and the second lens on the optical axis, and TTL is the total optical length of the wide-angle lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: ET4/CT4 is 0.1-0.9, where ET4 is the edge thickness of the fourth lens and CT4 is the center thickness of the fourth lens on the optical axis.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: T34/F34 is more than or equal to 0 and less than or equal to 0.2, wherein T34 is the air interval of the third lens and the fourth lens on the optical axis, and F34 is the combined focal length of the third lens and the fourth lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: ET6/CT6 is 0.1-0.9, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: and (CT 6+CT7)/T67 is more than or equal to 0.7 and less than or equal to 3.0, wherein CT6 is the center thickness of the sixth lens on the optical axis, CT7 is the center thickness of the seventh lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: 2.5 is less than or equal to TTL/IH is less than or equal to 4.1, wherein TTL is the total optical length of the wide-angle lens, and IH is the maximum image height corresponding to the maximum field angle of the wide-angle lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: BFL/F is more than or equal to 0.1 and less than or equal to 0.3, wherein BFL is the back focal length of the wide-angle lens.
According to an exemplary embodiment of the present utility model, the wide-angle lens further satisfies: IH/ENPD is more than or equal to 3.0 and less than or equal to 3.8, wherein IH is the maximum image height corresponding to the maximum field angle of the wide-angle lens, and ENPD is the entrance pupil diameter of the wide-angle lens.
The utility model adopts seven lenses, and by reasonably distributing the refractive power and the surface shape of each lens and matching with reasonable parameter setting, the wide-angle lens is applicable to high and low temperature environments, and at least one of the beneficial effects of high resolution (four thousand eight million pixels), large field angle, large image surface (the maximum image height IH corresponding to the maximum field angle is more than or equal to 12 mm) and miniaturization of the wide-angle lens are realized.
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 of a wide-angle lens according to embodiment 1 of the present utility model;
fig. 2 shows a schematic configuration of a wide-angle lens according to embodiment 2 of the present utility model;
fig. 3 shows a schematic configuration of a wide-angle lens according to embodiment 3 of the present utility model;
fig. 4 shows a schematic configuration of a wide-angle lens according to embodiment 4 of the present utility model;
fig. 5 shows a schematic configuration of a wide-angle lens according to embodiment 5 of the present utility model; and
fig. 6 shows a schematic configuration of a wide-angle lens according to embodiment 6 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 wide-angle lens 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. 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 the light on the object side surface of the first lens is smaller, and the light smoothly reaches the rear system through the first lens, so that the large field angle of the wide-angle lens is realized.
In an exemplary embodiment, the second lens may have a refractive power. The object-side surface of the second lens element may be convex, and the image-side surface may be concave. By arranging the second lens in the structure form, the large-angle light rays introduced by the first lens are contracted, the aberration generated by the first lens is balanced, the edge aberration of the wide-angle lens is reduced, and the ghost image risk of the wide-angle lens is reduced. As an example, the radius of curvature of the object side of the second lens is similar to the radius of curvature of the image side of the second lens, which is beneficial to smooth transition of light on the second lens and reduces the sensitivity of the second lens.
In an exemplary embodiment, the third lens may have a positive refractive power. The object side surface of the third lens can be a concave surface, the image side surface can be a convex surface, and by arranging the third lens into the structural form, the light trend between the second lens and the third lens is stable, so that the light emitted by the second lens is well received by the third lens, the loss of light of each view field is reduced, and the relative illumination of each view field is improved. Or, the object side surface of the third lens element may be convex, and the image side surface of the third lens element may be convex, so that the shape difference between the image side surface of the second lens element and the object side surface of the third lens element is obvious, the third lens element is ensured to effectively converge front light rays and smoothly transition to the rear, and the illuminance of the wide-angle lens element is improved.
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 convex image-side surface. Through setting up the fourth lens as positive lens, be favorable to reducing the deflection angle of light when converging light for the smooth transition of light trend, the lenticular design of collocation fourth lens simultaneously can reduce the influence of fourth lens self coma to wide angle lens, improves wide angle lens's imaging quality. As an example, the fourth lens may be a glass lens, which is beneficial to balancing high and low temperatures, and is beneficial to improving the imaging quality of the wide-angle lens by matching with an aspheric design, so as to realize high resolution of the wide-angle lens.
In an exemplary embodiment, the fifth lens may have a negative refractive power. The object-side surface of the fifth lens element may be concave, and the image-side surface thereof may be convex. By arranging the fifth lens in the structure form, the field curvature generated by the fifth lens can be reduced, and the imaging quality of the wide-angle lens can be improved.
In an exemplary embodiment, the sixth lens may have a positive refractive power. The object side surface of the sixth lens may be convex. Through setting up the sixth lens into above-mentioned structural style, be favorable to making the light that passes through the fifth lens can be at the gentle transition of sixth lens, reduce the distortion of wide-angle lens, increase wide-angle lens's imaging illuminance, still be favorable to reducing wide-angle lens's aberration sensitivity simultaneously, improve wide-angle lens's imaging quality.
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 structure form, the light rays adjusted by the lenses are effectively transmitted to the imaging surface, and the wide-angle lens is ensured to realize the characteristic of a large imaging surface. As an example, the image side of the seventh lens has at least one inflection point, which is beneficial to raise light, so that light smoothly transits to the imaging plane, thereby realizing a large image plane of the wide-angle lens.
In an exemplary embodiment, the wide-angle lens may further include a diaphragm. The diaphragm may be disposed, for example, between the third lens and the fourth lens.
In an exemplary embodiment, the wide-angle lens may further satisfy: -1.4 +.Df1 +.0.5, where D is the maximum optical aperture of the wide angle lens and F1 is the effective focal length of the first lens. The ratio of the maximum optical caliber of the wide-angle lens to the effective focal length of the first lens is limited in a reasonable range, so that large-angle light rays can be injected into the system, and the field angle of the wide-angle lens is effectively increased.
In an exemplary embodiment, the wide-angle lens may further satisfy: -3.0.ltoreq.F1/F.ltoreq.1.5, wherein F1 is the effective focal length of the first lens and F is the total effective focal length of the wide-angle lens. By restricting the ratio of the effective focal length of the first lens to the total effective focal length of the wide-angle lens within a reasonable range, the angle of view of the wide-angle lens can be increased, and the wide-angle characteristic of the wide-angle lens can be realized.
In an exemplary embodiment, the wide-angle lens may further satisfy: -0.2 +.ltoreq.R21-R22)/(R21+R22) +.0.3, where R21 is the radius of curvature of the object-side of the second lens and R22 is the radius of curvature of the image-side of the second lens. The curvature radiuses of the object side surface and the image side surface of the second lens are reasonably configured, so that the wide-angle view field light rays can be effectively converged, the aberration generated by the first lens can be reduced, and the high resolution of the wide-angle lens is realized.
In an exemplary embodiment, the wide-angle lens may further satisfy: F3/F is less than or equal to 1.6 and less than or equal to 3.2, wherein F3 is the effective focal length of the third lens, and F is the total effective focal length of the wide-angle lens. The ratio of the effective focal length of the third lens to the total effective focal length of the wide-angle lens is restricted in a reasonable range, so that the light converging capability of the wide-angle lens can be improved, the total optical length of the wide-angle lens is shortened, and meanwhile, spherical aberration, coma and field curvature generated by the third lens can be balanced, so that high resolution of the wide-angle lens is realized.
In an exemplary embodiment, the wide-angle lens may further satisfy: F4/F is more than or equal to 1.3 and less than or equal to 2.5, wherein F4 is the effective focal length of the fourth lens, and F is the total effective focal length of the wide-angle lens. The ratio of the effective focal length of the fourth lens to the total effective focal length of the wide-angle lens is limited in a reasonable range, so that smooth light transmission is facilitated, aberration of the wide-angle lens can be effectively corrected, and imaging quality of the wide-angle lens is improved.
In an exemplary embodiment, the wide-angle lens may further satisfy: -7.6.ltoreq.F5/F.ltoreq.4.5, wherein F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the wide-angle lens. The ratio of the effective focal length of the fifth lens to the total effective focal length of the wide-angle lens is limited in a reasonable range, so that the imaging area of the wide-angle lens can be increased, various aberrations of the wide-angle lens are effectively balanced, and the imaging quality of the wide-angle lens is improved.
In an exemplary embodiment, the wide-angle lens may further satisfy: F6/F is more than or equal to 2.5 and less than or equal to 12.0, wherein F6 is the effective focal length of the sixth lens, and F is the total effective focal length of the wide-angle lens. The ratio of the effective focal length of the sixth lens to the total effective focal length of the wide-angle lens is restricted in a reasonable range, so that the imaging area of the wide-angle lens can be increased, various aberrations of the wide-angle lens are effectively balanced, and the imaging quality of the wide-angle lens is improved.
In an exemplary embodiment, the wide-angle lens may further satisfy: -1.9.ltoreq.F7/F.ltoreq.1.0, wherein F7 is the effective focal length of the seventh lens, F is the total effective focal length of the wide-angle lens. The ratio of the effective focal length of the seventh lens to the total effective focal length of the wide-angle lens is limited in a reasonable range, so that the imaging area of the wide-angle lens can be increased, astigmatism and field curvature of the wide-angle lens are effectively balanced, and the imaging quality of the wide-angle lens is improved.
In an exemplary embodiment, the wide-angle lens may further satisfy: F34/F is more than or equal to 0.7 and less than or equal to 1.4, wherein F34 is the combined focal length of the third lens and the fourth lens, and F is the total effective focal length of the wide-angle lens. The ratio of the combined focal length of the third lens and the fourth lens to the total effective focal length of the wide-angle lens is limited in a reasonable range, so that the light trend between the second lens and the fifth lens can be controlled, the aberration caused by large-angle light entering through the second lens is reduced, meanwhile, the combined lens formed by the third lens and the fourth lens is ensured to be a positive lens, the light is suppressed, the rear end diameter of the wide-angle lens is reduced, and the miniaturization of the wide-angle lens is realized.
In an exemplary embodiment, the wide-angle lens may further satisfy: F7/F1 is more than or equal to 0.2 and less than or equal to 1.1, wherein F1 is the effective focal length of the first lens, and F7 is the effective focal length of the seventh lens. The ratio of the effective focal length of the seventh lens to the effective focal length of the first lens is limited in a reasonable range, so that the concentration of the refractive power of the wide-angle lens on the first lens can be avoided, the sensitivity of the first lens is further reduced, meanwhile, spherical aberration and field curvature which are not completely eliminated by the six lenses at the front end can be balanced by the seventh lens, and the imaging quality of the wide-angle lens is improved.
In an exemplary embodiment, the wide-angle lens may further satisfy: F12/F67 is more than or equal to 0.4 and less than or equal to 1.3, wherein F12 is the combined focal length of the first lens and the second lens, and F67 is the combined focal length of the sixth lens and the seventh lens. The ratio of the combined focal length of the first lens and the second lens to the combined focal length of the sixth lens and the seventh lens is limited in a reasonable range, the refractive power contribution of the front end lens and the rear end lens of the wide-angle lens can be reasonably distributed, further, the aberration such as field curvature and distortion of the wide-angle lens can be corrected, the imaging quality of the wide-angle lens is improved, the optical total length of the wide-angle lens can be shortened, and the miniaturization of the wide-angle lens is realized.
In an exemplary embodiment, the wide-angle lens may further satisfy: sigma CT is equal to or more than 0.3 and TTL is equal to or less than 0.9, wherein Sigma CT is the sum of the thicknesses of the centers of the first lens and the seventh lens on the optical axis, and TTL is the total optical length of the wide-angle lens. The center thickness of each lens on the optical axis is reasonably distributed, so that the optical total length of the wide-angle lens can be effectively shortened, and meanwhile, the structural design and the production process of the wide-angle lens are facilitated.
In an exemplary embodiment, the wide-angle lens may further satisfy: ET1/CT1 is 1.2.ltoreq.3.2, wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis. The edge thickness and the center thickness of the first lens are reasonably distributed, so that the first lens has good processability, light entering a large field angle of the system can be diffused, the incident angle is reduced, the light trend tends to be gentle, and the difficulty of aberration correction is reduced.
In an exemplary embodiment, the wide-angle lens may further satisfy: R11/CT1 is more than or equal to 9.0 and less than or equal to 30.1, wherein R11 is the curvature radius of the object side surface of the first lens, and CT1 is the center thickness of the first lens on the optical axis. The ratio of the curvature radius of the object side surface of the first lens to the central thickness of the first lens on the optical axis is limited in a reasonable range, so that the shape of the first lens is controlled, the shape of the first lens is prevented from being excessively bent, and meanwhile, the processing and forming of the first lens are facilitated.
In an exemplary embodiment, the wide-angle lens may further satisfy: T12/TTL is more than or equal to 0 and less than or equal to 0.3, wherein T12 is the air interval between the first lens and the second lens on the optical axis, and TTL is the total optical length of the wide-angle lens. The ratio of the air interval of the first lens and the second lens on the optical axis to the total optical length of the wide-angle lens is constrained in a reasonable range, so that light can be smoothly transited to a rear system, and enough space can be reserved at the same time for collocation structure setting.
In an exemplary embodiment, the wide-angle lens may further satisfy: ET4/CT4 is 0.1-0.9, where ET4 is the edge thickness of the fourth lens and CT4 is the center thickness of the fourth lens on the optical axis. The edge thickness and the center thickness of the fourth lens are reasonably distributed, so that the tolerance sensitivity of the fourth lens can be reduced.
In an exemplary embodiment, the wide-angle lens may further satisfy: T34/F34 is more than or equal to 0 and less than or equal to 0.2, wherein T34 is the air interval of the third lens and the fourth lens on the optical axis, and F34 is the combined focal length of the third lens and the fourth lens. The ratio of the air interval of the third lens and the fourth lens on the optical axis to the combined focal length of the third lens and the fourth lens is restricted in a reasonable range, so that light can smoothly transition from the image side surface of the third lens to the object side surface of the fourth lens, the deflection angle of marginal light at the deflection of the third lens and the fourth lens is reduced, the imaging quality of a marginal view field is improved, meanwhile, reflection of light between the third lens and the fourth lens is avoided, the risk of ghost image parasitic light is reduced, and the imaging quality of the wide-angle lens is improved.
In an exemplary embodiment, the wide-angle lens may further satisfy: ET6/CT6 is 0.1-0.9, where ET6 is the edge thickness of the sixth lens and CT6 is the center thickness of the sixth lens on the optical axis. The edge thickness and the center thickness of the sixth lens are reasonably distributed, so that manufacturability of the sixth lens is guaranteed, the size of the sixth lens is reduced, and deflection of light at the sixth lens can be relieved.
In an exemplary embodiment, the wide-angle lens may further satisfy: and (CT 6+CT7)/T67 is more than or equal to 0.7 and less than or equal to 3.0, wherein CT6 is the center thickness of the sixth lens on the optical axis, CT7 is the center thickness of the seventh lens on the optical axis, and T67 is the air interval between the sixth lens and the seventh lens on the optical axis. By restricting the ratio of the sum of the center thicknesses of the sixth lens and the seventh lens to the air interval of the sixth lens and the seventh lens within a reasonable range, the astigmatism of the wide-angle lens can be controlled.
In an exemplary embodiment, the wide-angle lens may further satisfy: 2.5 is less than or equal to TTL/IH is less than or equal to 4.1, wherein TTL is the total optical length of the wide-angle lens, and IH is the maximum image height corresponding to the maximum field angle of the wide-angle lens. The ratio of the total optical length of the wide-angle lens to the maximum image height corresponding to the maximum field angle of the wide-angle lens is limited in a reasonable range, so that the total optical length of the wide-angle lens can be effectively shortened while good imaging quality of the wide-angle lens is ensured, and further miniaturization of the wide-angle lens is realized.
In an exemplary embodiment, the wide-angle lens may further satisfy: BFL/F is not less than 0.1 and not more than 0.3, wherein BFL is the back focal length of the wide-angle lens, and F is the total effective focal length of the wide-angle lens. The ratio of the back focal length of the wide-angle lens to the total effective focal length of the wide-angle lens is constrained within a reasonable range, so that balance can be achieved between the good imaging quality of the wide-angle lens and the easy-to-assemble back focal length of the wide-angle lens, the imaging quality of the wide-angle lens is ensured, and meanwhile, the assembly process difficulty of the wide-angle lens is reduced.
In an exemplary embodiment, the wide-angle lens may further satisfy: IH/ENPD is more than or equal to 3.0 and less than or equal to 3.8, wherein IH is the maximum image height corresponding to the maximum field angle of the wide-angle lens, and ENPD is the entrance pupil diameter of the wide-angle lens. The ratio of the maximum image height corresponding to the maximum field angle of the wide-angle lens to the entrance pupil diameter of the wide-angle lens is constrained within a reasonable range, so that the width of a light beam entering the wide-angle lens can be increased, and the generation of a dark angle is avoided while the image plane brightness of the wide-angle lens is improved.
The wide-angle lens according to the above embodiment of the present utility model may employ a plurality of lenses, for example, the seven lenses described above, and can be adapted to a high-low temperature environment by reasonably distributing optical parameters such as refractive power, surface shape, center thickness of each lens, and on-axis spacing between each lens, and realize at least one of high resolution, large field angle, large image plane, and miniaturization of the wide-angle lens. The wide-angle lens provided by the utility model can be, for example, a wide-angle lens with a maximum image height IH which corresponds to a maximum field angle of not less than 12mm and four thousand eight million pixels.
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. Optionally, the object side surface and the image side surface of each of the second lens element to the seventh lens element are aspheric mirror surfaces.
However, it will be appreciated by those skilled in the art that the number of lenses making up the wide angle lens can 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 wide-angle lenses applicable to the above embodiments are further described below with reference to the drawings.
Example 1
A wide-angle lens according to embodiment 1 of the present utility model is described below with reference to fig. 1. Fig. 1 is a schematic diagram of the structure of a wide-angle lens according to embodiment 1 of the present utility model.
As shown in fig. 1, the wide-angle lens 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 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 concave. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is concave, 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 convex. The fifth lens element L5 has a negative 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 positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is concave. 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. 1.
Table 1 shows basic parameter tables of the wide-angle lens 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 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 reciprocal of radius of curvature R in table 1 above) The method comprises the steps of carrying out a first treatment on the surface of the 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 S3-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 |
| S3 | -1.424 | 7.58E-04 | -8.98E-06 | 2.30E-07 | -1.12E-08 | -1.94E-09 | 1.43E-10 | -3.62E-12 |
| S4 | 25.446 | 2.61E-03 | -4.56E-05 | 1.06E-05 | -2.71E-06 | -2.00E-07 | 6.71E-08 | -6.91E-09 |
| S5 | -57.810 | -5.33E-04 | -2.01E-05 | -2.49E-05 | 2.76E-06 | -1.84E-07 | -1.15E-08 | 1.39E-09 |
| S6 | -2.155 | 7.38E-03 | -2.98E-03 | 5.36E-04 | 7.87E-05 | -4.47E-05 | 4.72E-06 | 7.42E-08 |
| S7 | 27.543 | 1.21E-03 | -3.48E-03 | -2.90E-04 | 1.71E-04 | -1.28E-05 | -1.08E-05 | 1.39E-07 |
| S8 | -6.367 | -1.27E-02 | -3.54E-04 | 3.90E-05 | -5.90E-07 | -4.95E-06 | 4.24E-07 | -3.21E-08 |
| S9 | -0.980 | -1.55E-03 | 4.99E-04 | 5.61E-05 | 2.24E-05 | -9.72E-07 | -6.17E-07 | 5.29E-08 |
| S10 | -17.868 | -2.34E-03 | 8.63E-04 | 4.32E-05 | -7.32E-06 | 5.68E-07 | 8.26E-08 | -1.02E-08 |
| S11 | -13.720 | -7.41E-03 | 2.76E-04 | -5.32E-05 | 1.09E-06 | 3.99E-08 | -1.78E-08 | -3.00E-09 |
| S12 | -30.488 | -5.13E-03 | -1.82E-04 | 8.30E-06 | -1.29E-06 | -4.45E-09 | -6.36E-09 | 1.88E-12 |
| S13 | 14.155 | -2.11E-02 | 1.45E-03 | -7.62E-05 | -7.34E-07 | -8.35E-08 | 3.06E-08 | -6.63E-10 |
| S14 | -38.980 | -8.36E-03 | 4.88E-04 | -2.01E-05 | 5.60E-08 | 1.31E-08 | 3.17E-10 | -1.76E-11 |
TABLE 2
Example 2
A wide-angle lens according to embodiment 2 of the present utility model is described below with reference to fig. 2. Fig. 2 is a schematic diagram of the structure of a wide-angle lens according to embodiment 2 of the present utility model.
As shown in fig. 2, the wide-angle lens 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 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 concave. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is concave, 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 convex. The fifth lens element L5 has a negative 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 positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is concave. 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. 2.
Table 3 shows a basic parameter table of the wide-angle lens 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 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 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | 9.947 | 6.20E-04 | -7.87E-06 | 2.31E-07 | 1.00E-08 | -9.90E-10 | 3.31E-11 | -3.76E-13 |
| S4 | 46.186 | 3.39E-03 | -3.11E-05 | 1.76E-05 | -3.08E-07 | -1.30E-07 | 2.77E-08 | -1.13E-09 |
| S5 | -109.072 | -1.59E-04 | -9.76E-05 | -1.10E-05 | 2.87E-06 | -1.66E-07 | -2.78E-08 | 3.72E-09 |
| S6 | 0.081 | 5.25E-03 | -2.73E-03 | 5.64E-04 | 6.47E-05 | -4.67E-05 | 5.33E-06 | 4.73E-08 |
| S7 | 22.403 | -8.30E-04 | -3.31E-03 | -3.01E-05 | 2.01E-04 | -2.45E-05 | -1.80E-05 | 3.33E-06 |
| S8 | -5.340 | -1.13E-02 | 3.63E-05 | 1.75E-06 | -1.72E-05 | -7.94E-07 | 1.10E-06 | -1.48E-07 |
| S9 | 3.007 | -2.07E-03 | 2.29E-04 | 5.97E-05 | 6.78E-06 | -5.13E-07 | 1.10E-07 | -2.49E-08 |
| S10 | -36.429 | -1.12E-03 | 2.43E-04 | 1.77E-05 | -4.11E-08 | 5.28E-07 | -4.69E-08 | -1.41E-09 |
| S11 | 1.865 | -3.93E-03 | 8.58E-05 | -1.16E-05 | 6.36E-07 | -1.23E-07 | -1.13E-08 | 1.22E-09 |
| S12 | -15.557 | -3.93E-03 | 5.80E-05 | 1.15E-05 | -1.13E-06 | 1.69E-09 | 1.34E-09 | -2.22E-10 |
| S13 | 10.332 | -2.32E-02 | 1.67E-03 | -2.63E-05 | -5.42E-07 | -2.02E-08 | 1.27E-08 | -9.68E-10 |
| S14 | -33.410 | -9.30E-03 | 4.47E-04 | -9.75E-06 | 1.46E-08 | 2.63E-09 | 6.49E-11 | -4.15E-12 |
TABLE 4 Table 4
Example 3
A wide-angle lens according to embodiment 3 of the present utility model is described below with reference to fig. 3. Fig. 3 is a schematic diagram of the structure of a wide-angle lens according to embodiment 3 of the present utility model.
As shown in fig. 3, the wide-angle lens 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 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 convex. The fifth lens element L5 has a negative 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 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. 3.
Table 5 shows the basic parameter table of the wide-angle lens 300 of embodiment 3, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
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TABLE 5
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 | 2.876 | 4.50E-03 | -7.45E-05 | -2.10E-06 | 5.32E-07 | -3.75E-08 | 2.06E-10 | -4.11E-10 |
| S4 | 14.146 | 7.02E-03 | -1.88E-04 | 1.83E-07 | 3.50E-06 | -4.23E-07 | -8.03E-10 | -1.98E-08 |
| S5 | -70.812 | -4.12E-03 | -2.93E-04 | 6.44E-05 | -9.92E-06 | 2.84E-06 | -3.92E-08 | 3.54E-08 |
| S6 | 1.349 | 3.87E-03 | -1.46E-04 | 1.78E-04 | 2.31E-05 | 4.53E-06 | -1.13E-06 | -1.15E-06 |
| S7 | -0.747 | -2.47E-04 | -1.33E-04 | -1.60E-04 | 1.67E-05 | 1.83E-06 | 3.24E-07 | -7.30E-08 |
| S8 | 4.432 | -1.09E-02 | 7.62E-04 | 7.24E-05 | -1.17E-05 | -4.98E-07 | 1.62E-07 | 7.60E-08 |
| S9 | 3.185 | -3.39E-03 | 1.02E-03 | -2.20E-05 | 5.70E-06 | -3.28E-07 | -3.60E-08 | -4.37E-10 |
| S10 | 13.392 | 4.74E-03 | 3.51E-04 | 2.90E-05 | -2.50E-06 | -3.10E-07 | 9.33E-09 | 1.61E-09 |
| S11 | -37.152 | -7.59E-03 | -5.60E-04 | 3.26E-05 | 4.88E-07 | 3.82E-07 | 5.88E-08 | 5.47E-10 |
| S12 | 17.995 | -7.18E-03 | -1.72E-04 | 1.13E-05 | 1.31E-06 | 2.13E-08 | 1.81E-08 | 1.87E-09 |
| S13 | 18.308 | -2.25E-02 | 7.65E-04 | -4.02E-05 | -5.16E-06 | 9.96E-07 | -3.59E-08 | -4.80E-09 |
| S14 | -20.702 | -6.98E-03 | 3.68E-04 | -1.91E-05 | 1.52E-07 | 9.19E-09 | 1.29E-10 | -1.25E-11 |
TABLE 6
Example 4
A wide-angle lens 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 a wide-angle lens according to embodiment 4 of the present utility model.
As shown in fig. 4, the wide-angle lens 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 third lens L3 and the fourth lens L4.
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 convex. The fifth lens element L5 has a negative 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 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 wide-angle lens 400 of embodiment 4, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 7
In embodiment 4, 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 8 shows the cone coefficients k and the higher order coefficients A for each of the aspherical mirror surfaces S3-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 |
| S3 | 23.535 | 1.20E-03 | -3.56E-05 | 4.68E-07 | -5.33E-08 | -1.07E-09 | 3.23E-10 | -3.33E-11 |
| S4 | 36.235 | 4.11E-03 | -1.14E-04 | -7.03E-06 | 2.45E-06 | 1.17E-08 | 1.28E-07 | -3.06E-08 |
| S5 | 10.615 | -8.18E-04 | 3.90E-05 | -1.86E-05 | 1.07E-05 | 2.91E-07 | -1.75E-09 | -2.39E-08 |
| S6 | -3.402 | 6.57E-03 | -1.14E-03 | 1.59E-04 | 2.74E-05 | -5.44E-06 | 1.49E-05 | -4.77E-06 |
| S7 | 39.964 | 2.81E-03 | -1.51E-03 | -4.42E-04 | 6.69E-05 | 6.26E-07 | 9.67E-07 | -1.62E-06 |
| S8 | -6.766 | -1.38E-02 | 5.65E-05 | -8.76E-05 | -1.13E-05 | -3.71E-06 | 1.47E-06 | -3.30E-07 |
| S9 | 14.840 | -4.01E-03 | 7.79E-04 | 1.54E-05 | 1.20E-05 | -2.06E-06 | -7.81E-07 | 1.17E-07 |
| S10 | 50.000 | -4.73E-03 | 8.23E-04 | 9.38E-05 | -3.72E-06 | -6.09E-08 | -1.73E-07 | 1.18E-08 |
| S11 | -21.778 | -8.96E-03 | -2.07E-04 | 6.97E-06 | 4.97E-06 | -5.84E-07 | -6.63E-08 | 1.92E-08 |
| S12 | 7.305 | -2.52E-03 | -6.80E-04 | 1.08E-05 | -1.36E-07 | -9.74E-08 | -3.25E-08 | 8.70E-10 |
| S13 | 5.765 | -2.40E-02 | 1.62E-03 | -1.16E-04 | 7.57E-07 | 1.31E-07 | -7.04E-09 | -2.81E-09 |
| S14 | -25.839 | -7.30E-03 | 3.73E-04 | -1.36E-05 | -5.32E-08 | 1.23E-08 | 1.53E-10 | -1.43E-11 |
TABLE 8
Example 5
A wide-angle lens 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 a wide-angle lens according to embodiment 5 of the present utility model.
As shown in fig. 5, the wide-angle lens 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 third lens L3 and the fourth lens L4.
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 concave. The third lens element L3 has a positive refractive power, wherein an object-side surface S5 thereof is concave, 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 convex. The fifth lens element L5 has a negative 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 positive refractive power, wherein an object-side surface S11 thereof is convex, and an image-side surface S12 thereof is concave. 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. 5.
Table 9 shows a basic parameter table of a wide-angle lens 500 of embodiment 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 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 S3-S14 usable in example 5 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
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Table 10
Example 6
A wide-angle lens according to embodiment 6 of the present utility model is described below with reference to fig. 6. Fig. 6 is a schematic structural diagram of a wide-angle lens according to embodiment 6 of the present utility model.
As shown in fig. 6, the wide-angle lens 600 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 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 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 convex. The fifth lens element L5 has a negative 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 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. 6.
Table 11 shows a basic parameter table of the wide-angle lens 600 of embodiment 6, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 11
In embodiment 6, 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 12 shows the cone coefficients k and the higher order coefficients A for each of the aspherical mirror surfaces S3-S14 used in example 6 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 | -4.033 | 1.29E-03 | -3.05E-05 | 5.47E-07 | -6.34E-08 | -3.78E-09 | 1.79E-11 | 0.00E+00 |
| S4 | 16.265 | 4.08E-03 | -1.76E-04 | -8.56E-06 | -1.86E-06 | -5.04E-07 | 8.36E-08 | 0.00E+00 |
| S5 | 23.941 | -1.55E-04 | -5.32E-05 | -5.25E-05 | 4.83E-06 | -3.30E-07 | 5.05E-08 | 1.12E-09 |
| S6 | -8.269 | 7.38E-03 | -1.64E-03 | 3.39E-04 | 7.87E-05 | -3.20E-05 | 5.59E-06 | 4.27E-07 |
| S7 | 18.706 | 2.69E-03 | -2.95E-03 | -2.87E-04 | 1.47E-04 | -1.81E-05 | -6.10E-06 | -2.83E-07 |
| S8 | -8.258 | -1.25E-02 | -7.23E-04 | -3.42E-05 | 3.34E-06 | -3.45E-06 | -7.34E-07 | 6.27E-08 |
| S9 | 6.253 | -3.53E-03 | -2.68E-04 | -1.94E-04 | 4.66E-05 | 5.45E-06 | -6.62E-07 | -8.18E-09 |
| S10 | 27.942 | -5.92E-03 | 6.24E-04 | 1.40E-04 | -1.81E-06 | -2.78E-07 | -2.90E-07 | 4.30E-08 |
| S11 | -49.717 | -8.18E-03 | 2.89E-04 | 8.01E-05 | 3.28E-06 | -1.80E-06 | -1.96E-07 | 2.75E-08 |
| S12 | 16.849 | -3.34E-03 | -4.19E-04 | 2.64E-05 | 2.04E-06 | -4.94E-08 | -1.67E-08 | -1.81E-09 |
| S13 | 14.782 | -3.02E-02 | 2.24E-03 | -6.94E-05 | -5.26E-06 | -1.65E-07 | 7.61E-08 | -3.94E-09 |
| S14 | -15.764 | -1.10E-02 | 8.07E-04 | -3.09E-05 | -9.35E-08 | 2.30E-08 | 5.75E-10 | -3.04E-11 |
In summary, the conditional expressions in examples 1 to 6 satisfy the relationship shown in table 13.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 |
| D/F1 | -1.008 | -0.858 | -0.785 | -0.960 | -1.144 | -1.015 |
| F1/F | -2.102 | -2.536 | -2.264 | -2.526 | -1.867 | -2.039 |
| (R21-R22)/(R21+R22) | -0.007 | 0.018 | 0.158 | 0.135 | -0.149 | -0.061 |
| F3/F | 2.329 | 2.894 | 1.982 | 2.006 | 2.765 | 2.337 |
| F4/F | 1.587 | 1.584 | 1.674 | 2.206 | 1.560 | 1.938 |
| F5/F | -5.843 | -6.475 | -7.272 | -6.860 | -4.755 | -4.939 |
| F6/F | 11.853 | 8.165 | 6.208 | 2.902 | 5.669 | 2.722 |
| F7/F | -1.571 | -1.514 | -1.498 | -1.193 | -1.597 | -1.256 |
| F34/F | 0.998 | 1.051 | 0.955 | 1.126 | 1.040 | 1.158 |
| F7/F1 | 0.748 | 0.597 | 0.662 | 0.472 | 0.855 | 0.616 |
| F12/F67 | 0.994 | 1.104 | 0.833 | 0.740 | 0.795 | 0.569 |
| ∑CT/TTL | 0.640 | 0.651 | 0.550 | 0.600 | 0.583 | 0.615 |
| ET1/CT1 | 1.486 | 2.886 | 1.576 | 1.739 | 1.502 | 1.621 |
| R11/CT1 | 12.146 | 30.446 | 9.173 | 14.629 | 11.475 | 15.064 |
| T12/TTL | 0.126 | 0.108 | 0.145 | 0.188 | 0.166 | 0.177 |
| ET4/CT4 | 0.592 | 0.655 | 0.400 | 0.479 | 0.322 | 0.584 |
| T34/F34 | 0.056 | 0.028 | 0.032 | 0.059 | 0.046 | 0.053 |
| ET6/CT6 | 0.658 | 0.655 | 0.581 | 0.368 | 0.591 | 0.333 |
| (CT6+CT7)/T67 | 1.344 | 1.186 | 1.677 | 1.935 | 0.998 | 2.260 |
| TTL/IH | 3.783 | 3.793 | 2.784 | 3.618 | 3.813 | 3.608 |
| BFL/F | 0.242 | 0.234 | 0.269 | 0.258 | 0.235 | 0.278 |
| IH/ENPD | 3.260 | 3.297 | 3.634 | 3.618 | 3.255 | 3.537 |
TABLE 13
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 wide-angle lens described above.
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 (23)
1. The wide-angle lens is characterized by 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 optical power;
a third lens having positive refractive power;
a fourth lens having positive refractive power;
a fifth lens element with negative refractive power having a concave object-side surface and a convex image-side surface;
a sixth lens element with positive refractive power having a convex object-side surface; and
a seventh lens with negative refractive power, the object-side surface of which is concave, the image-side surface of which is concave,
wherein, the wide angle lens satisfies:
1.6≤F3/F≤3.2，
wherein F3 is an effective focal length of the third lens, and F is a total effective focal length of the wide-angle lens.
2. The wide-angle lens of claim 1, wherein the first lens element has a convex object-side surface and a concave image-side surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the image side surface of the third lens is a convex surface; the fourth lens element has a convex object-side surface and a convex image-side surface.
3. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
-1.4≤D/F1≤-0.5，
wherein D is the maximum optical aperture of the wide-angle lens, and F1 is the effective focal length of the first lens.
4. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
-3.0≤F1/F≤-1.5，
wherein F1 is the effective focal length of the first lens.
5. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
-0.2≤(R21-R22)/(R21+R22)≤0.3，
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.
6. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
1.3≤F4/F≤2.5，
wherein F4 is the effective focal length of the fourth lens.
7. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
-7.6≤F5/F≤-4.5，
wherein F5 is the effective focal length of the fifth lens.
8. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
2.5≤F6/F≤12.0，
wherein F6 is the effective focal length of the sixth lens.
9. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
-1.9≤F7/F≤-1.0，
wherein F7 is the effective focal length of the seventh lens.
10. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.2≤F7/F1≤1.1，
wherein F1 is an effective focal length of the first lens, and F7 is an effective focal length of the seventh lens.
11. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.7≤F34/F≤1.4，
wherein F34 is a combined focal length of the third lens and the fourth lens.
12. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.4≤F12/F67≤1.3，
wherein F12 is a combined focal length of the first lens and the second lens, and F67 is a combined focal length of the sixth lens and the seventh lens.
13. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.3≤∑CT/TTL≤0.9，
wherein Σct is the sum of the center thicknesses of the respective lenses of the first lens to the seventh lens on the optical axis, and TTL is the total optical length of the wide-angle lens.
14. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
1.2≤ET1/CT1≤3.2，
wherein ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens on the optical axis.
15. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
9.0≤R11/CT1≤30.1，
wherein R11 is a radius of curvature of an object side surface of the first lens, and CT1 is a center thickness of the first lens on the optical axis.
16. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0≤T12/TTL≤0.3，
wherein T12 is an air space between the first lens and the second lens on the optical axis, and TTL is an optical total length of the wide-angle lens.
17. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.1≤ET4/CT4≤0.9，
wherein ET4 is the edge thickness of the fourth lens, and CT4 is the center thickness of the fourth lens on the optical axis.
18. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0≤T34/F34≤0.2，
wherein T34 is an air space between the third lens and the fourth lens on the optical axis, and F34 is a combined focal length of the third lens and the fourth lens.
19. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.1≤ET6/CT6≤0.9，
wherein ET6 is the edge thickness of the sixth lens, and CT6 is the center thickness of the sixth lens on the optical axis.
20. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.7≤(CT6+CT7)/T67≤3.0，
wherein CT6 is the center thickness of the sixth lens on the optical axis, CT7 is the center thickness of the seventh lens on the optical axis, and T67 is the air gap between the sixth lens and the seventh lens on the optical axis.
21. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
2.5≤TTL/IH≤4.1，
wherein TTL is the total optical length of the wide-angle lens, IH is the maximum image height corresponding to the maximum field angle of the wide-angle lens.
22. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
0.1≤BFL/F≤0.3，
wherein BFL is the back focal length of the wide-angle lens.
23. The wide-angle lens according to claim 1 or 2, characterized in that the wide-angle lens further satisfies:
3.0≤IH/ENPD≤3.8，
IH is the maximum image height corresponding to the maximum field angle of the wide-angle lens, and ENPD is the entrance pupil diameter of the wide-angle lens.
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| CN202321281279.6U CN220085151U (en) | 2023-05-24 | 2023-05-24 | Wide-angle lens |
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