CN116500757A - Wide-angle lens - Google Patents
Wide-angle lens Download PDFInfo
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- CN116500757A CN116500757A CN202310595634.5A CN202310595634A CN116500757A CN 116500757 A CN116500757 A CN 116500757A CN 202310595634 A CN202310595634 A CN 202310595634A CN 116500757 A CN116500757 A CN 116500757A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- Optics & Photonics (AREA)
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Abstract
The application discloses wide-angle lens, it includes in order from object side to image side along the optical axis: the first lens is provided with negative focal power, and the object side surface of the first lens is a convex surface; a second lens having optical power; a third lens having positive optical power, and an image side surface thereof being a convex surface; a fourth lens having positive optical power; a fifth lens having negative optical power; a sixth lens having positive optical power, the object side surface of which is a convex surface; and a seventh lens having negative optical power.
Description
Technical Field
The application 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 application provides a wide-angle lens that may at least solve or partially solve at least one problem or other problems occurring in the prior art.
An aspect of the present application provides a wide-angle lens including, in order from an object side to an image side along an optical axis: the first lens is provided with negative focal power, and the object side surface of the first lens is a convex surface; a second lens having optical power; a third lens having positive optical power, and an image side surface thereof being a convex surface; a fourth lens having positive optical power; a fifth lens having negative optical power; a sixth lens having positive optical power, the object side surface of which is a convex surface; and a seventh lens having negative optical power.
According to an exemplary embodiment of the present application, the image side surface of the first lens is concave.
According to an exemplary embodiment of the present application, the object-side surface of the second lens is convex and the image-side surface is concave.
According to an exemplary embodiment of the present application, the object-side surface of the fourth lens element is convex, and the image-side surface is convex.
According to an exemplary embodiment of the present application, the object-side surface of the fifth lens element is concave, and the image-side surface is convex.
According to an exemplary embodiment of the present application, the object-side surface of the seventh lens is concave, and the image-side surface is concave.
According to an exemplary embodiment of the present application, the maximum optical aperture D of the wide-angle lens and the effective focal length F1 of the first lens satisfy: -1.4-0.5D/F1.
According to an exemplary embodiment of the present application, the effective focal length F1 of the first lens and the total effective focal length F of the wide-angle lens satisfy: F1/F is less than or equal to-3.0 and less than or equal to-1.5.
According to an exemplary embodiment of the present application, the radius of curvature R21 of the object-side surface of the second lens and the radius of curvature R22 of the image-side surface of the second lens satisfy: -0.2 < R21-R22)/(R21+R22) < 1.0.
According to an exemplary embodiment of the present application, the effective focal length F3 of the third lens and the total effective focal length F of the wide-angle lens satisfy: F3/F is less than or equal to 1.6 and less than or equal to 3.2.
According to an exemplary embodiment of the present application, the effective focal length F4 of the fourth lens and the total effective focal length F of the wide-angle lens satisfy: F4/F is less than or equal to 1.3 and less than or equal to 2.5.
According to an exemplary embodiment of the present application, the effective focal length F5 of the fifth lens and the total effective focal length F of the wide-angle lens satisfy: -7.6.ltoreq.F5/F.ltoreq.4.5.
According to an exemplary embodiment of the present application, the effective focal length F6 of the sixth lens and the total effective focal length F of the wide-angle lens satisfy: F6/F is less than or equal to 2.5 and less than or equal to 8.5.
According to an exemplary embodiment of the present application, the effective focal length F7 of the seventh lens and the total effective focal length F of the wide-angle lens satisfy: F7/F is less than or equal to-1.9 and less than or equal to-1.0.
According to an exemplary embodiment of the present application, the combined focal length F34 of the third lens and the fourth lens and the total effective focal length F of the wide-angle lens satisfy: F34/F is more than or equal to 0.7 and less than or equal to 1.4.
According to an exemplary embodiment of the present application, the effective focal length F1 of the first lens and the effective focal length F7 of the seventh lens satisfy: F7/F1 is more than or equal to 0.2 and less than or equal to 1.1.
According to an exemplary embodiment of the present application, the combined focal length F12 of the first lens and the second lens and the combined focal length F67 of the sixth lens and the seventh lens satisfy: F12/F67 is more than or equal to 0.4 and less than or equal to 1.3.
According to an exemplary embodiment of the present application, the sum Σct of the center thicknesses of the respective lenses in the first to seventh lenses on the optical axis and the optical total length TTL of the wide-angle lens satisfy: sigma CT/TTL is more than or equal to 0.3 and less than or equal to 0.9.
According to an exemplary embodiment of the present application, the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: ET1/CT1 is less than or equal to 1.2 and less than or equal to 3.2.
According to an exemplary embodiment of the present application, the radius of curvature R11 of the object side surface of the first lens and the center thickness CT1 of the first lens on the optical axis satisfy: R11/CT1 is more than or equal to 9.0 and less than or equal to 30.1.
According to an exemplary embodiment of the present application, the air interval T12 of the first lens and the second lens on the optical axis and the total optical length TTL of the wide-angle lens satisfy: T12/TTL is more than or equal to 0 and less than or equal to 0.3.
According to an exemplary embodiment of the present application, the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis satisfy: ET4/CT4 is more than or equal to 0.1 and less than or equal to 0.9.
According to an exemplary embodiment of the present application, the air interval T34 of the third lens and the fourth lens on the optical axis and the combined focal length F34 of the third lens and the fourth lens satisfy: T34/F34 is more than or equal to 0 and less than or equal to 0.2.
According to an exemplary embodiment of the present application, the edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis satisfy: ET6/CT6 is more than or equal to 0.1 and less than or equal to 0.9.
According to an exemplary embodiment of the present application, the center thickness CT6 of the sixth lens on the optical axis, the center thickness CT7 of the seventh lens on the optical axis, and the air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: the ratio of (CT6+CT7)/T67 is more than or equal to 0.7 and less than or equal to 3.0.
According to an exemplary embodiment of the present application, the maximum image height IH corresponding to the maximum field angle of the wide-angle lens and the total optical length TTL of the wide-angle lens satisfy: TTL/IH is less than or equal to 2.5 and less than or equal to 4.1.
According to an exemplary embodiment of the present application, the back focal length BFL of the wide-angle lens and the total effective focal length F of the wide-angle lens satisfy: BFL/F is more than or equal to 0.1 and less than or equal to 0.3.
According to an exemplary embodiment of the present application, the maximum image height IH corresponding to the maximum field angle of the wide-angle lens and the entrance pupil diameter ENPD of the wide-angle lens satisfy: IH/ENPD is more than or equal to 3.0 and less than or equal to 3.8.
Seven lenses are adopted, focal power and surface type of each lens are reasonably distributed, and reasonable parameter setting is matched, so that the wide-angle lens is suitable for high-low temperature environments, and at least one of high resolution (four thousand eight million pixels), large field angle, large image surface (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 application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 shows a schematic configuration diagram of a wide-angle lens according to embodiment 1 of the present application;
fig. 2 shows a schematic configuration of a wide-angle lens according to embodiment 2 of the present application;
fig. 3 shows a schematic configuration of a wide-angle lens according to embodiment 3 of the present application;
fig. 4 shows a schematic configuration of a wide-angle lens according to embodiment 4 of the present application;
fig. 5 shows a schematic configuration diagram of a wide-angle lens according to embodiment 5 of the present application; and
fig. 6 shows a schematic configuration of a wide-angle lens according to embodiment 6 of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application are described in detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are 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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The wide-angle lens 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, 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 negative optical 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 optical 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 positive optical 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 positive optical 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 negative optical 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 positive optical 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 negative optical 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 maximum optical aperture D of the wide-angle lens and the effective focal length F1 of the first lens may satisfy: -1.4-0.5D/F1. The ratio of the maximum optical caliber of the wide-angle lens to the effective focal length of the first lens is reasonably configured, so that large-angle light rays are injected into the system, and the field angle of the wide-angle lens is effectively increased.
In an exemplary embodiment, the effective focal length F1 of the first lens and the total effective focal length F of the wide-angle lens may satisfy: F1/F is less than or equal to-3.0 and less than or equal to-1.5. The effective focal length value of the first lens is reasonably configured, which is favorable for increasing the field angle of the wide-angle lens and realizing the wide-angle characteristic of the wide-angle lens.
In an exemplary embodiment, the radius of curvature R21 of the object side surface of the second lens and the radius of curvature R22 of the image side surface of the second lens may satisfy: -0.2 < R21-R22)/(R21+R22) < 1.0. 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 effective focal length F3 of the third lens and the total effective focal length F of the wide-angle lens may satisfy: F3/F is less than or equal to 1.6 and less than or equal to 3.2. The effective focal length value of the third lens is reasonably configured, so that the light convergence capability of the wide-angle lens is improved, the optical total length of the wide-angle lens is shortened, and meanwhile, spherical aberration, coma aberration and field curvature generated by the third lens can be effectively balanced, and high resolution of the wide-angle lens is realized.
In an exemplary embodiment, the effective focal length F4 of the fourth lens and the total effective focal length F of the wide-angle lens may satisfy: F4/F is less than or equal to 1.3 and less than or equal to 2.5. The effective focal length value of the fourth lens is reasonably configured, 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 effective focal length F5 of the fifth lens and the total effective focal length F of the wide-angle lens may satisfy: -7.6.ltoreq.F5/F.ltoreq.4.5. The effective focal length value of the fifth lens is reasonably configured, 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 effective focal length F6 of the sixth lens and the total effective focal length F of the wide-angle lens may satisfy: F6/F is less than or equal to 2.5 and less than or equal to 8.5. The effective focal length value of the sixth lens is reasonably configured, 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 effective focal length F7 of the seventh lens and the total effective focal length F of the wide-angle lens may satisfy: F7/F is less than or equal to-1.9 and less than or equal to-1.0. The effective focal length value of the seventh lens is reasonably configured, 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 combined focal length F34 of the third lens and the fourth lens and the total effective focal length F of the wide-angle lens may satisfy: F34/F is more than or equal to 0.7 and less than or equal to 1.4. The combined focal length value of the third lens and the fourth lens is reasonably configured, so that the control of the light trend between the second lens and the fifth lens is facilitated, 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 a positive lens, the light can be 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 effective focal length F1 of the first lens and the effective focal length F7 of the seventh lens may satisfy: F7/F1 is more than or equal to 0.2 and less than or equal to 1.1. The effective focal length values of the first lens and the seventh lens are reasonably configured, so that focal power of the wide-angle lens can be prevented from being concentrated in the first lens, sensitivity of the first lens is reduced, spherical aberration and field curvature which are not completely eliminated by six lenses at the front end can be balanced by the seventh lens, and imaging quality of the wide-angle lens is improved.
In an exemplary embodiment, the combined focal length F12 of the first lens and the second lens and the combined focal length F67 of the sixth lens and the seventh lens may satisfy: F12/F67 is more than or equal to 0.4 and less than or equal to 1.3. The focal power contribution of the front end lens and the rear end lens of the wide-angle lens are reasonably configured, so that aberration such as field curvature and distortion of the wide-angle lens can be corrected, imaging quality of the wide-angle lens can be improved, meanwhile, the total optical length of the wide-angle lens can be shortened, and miniaturization of the wide-angle lens can be realized.
In an exemplary embodiment, the sum Σct of the center thicknesses of each lens in the first to seventh lenses on the optical axis and the optical total length TTL of the wide-angle lens may satisfy: sigma CT/TTL is more than or equal to 0.3 and less than or equal to 0.9. The center thickness of each lens on the optical axis is reasonably configured, 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 edge thickness ET1 of the first lens and the center thickness CT1 of the first lens on the optical axis may satisfy: ET1/CT1 is less than or equal to 1.2 and less than or equal to 3.2. The edge thickness and the center thickness of the first lens are reasonably configured, 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 radius of curvature R11 of the object side surface of the first lens and the center thickness CT1 of the first lens on the optical axis may satisfy: R11/CT1 is more than or equal to 9.0 and less than or equal to 30.1. The ratio of the curvature radius of the object side surface of the first lens to the thickness of the center of the first lens on the optical axis is reasonably configured, so that the shape of the first lens is restrained, 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 air interval T12 of the first lens and the second lens on the optical axis and the optical total length TTL of the wide-angle lens may satisfy: T12/TTL is more than or equal to 0 and less than or equal to 0.3. The air interval of the first lens and the second lens on the optical axis is reasonably configured, so that smooth transition of light to a rear system is facilitated, and enough space is reserved for collocation structure arrangement.
In an exemplary embodiment, the edge thickness ET4 of the fourth lens and the center thickness CT4 of the fourth lens on the optical axis may satisfy: ET4/CT4 is more than or equal to 0.1 and less than or equal to 0.9. The edge thickness and the center thickness of the fourth lens are reasonably configured, so that tolerance sensitivity of the fourth lens is reduced.
In an exemplary embodiment, the air interval T34 of the third lens and the fourth lens on the optical axis and the combined focal length F34 of the third lens and the fourth lens may satisfy: T34/F34 is more than or equal to 0 and less than or equal to 0.2. 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 reasonably configured, so that smooth transition of light from the image side surface of the third lens to the object side surface of the fourth lens is facilitated, the deflection angle of marginal light at the deflection of the third lens and the fourth lens is further reduced, the imaging quality of a marginal view field is improved, meanwhile, reflection of light between the third lens and the fourth lens is also facilitated, 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 edge thickness ET6 of the sixth lens and the center thickness CT6 of the sixth lens on the optical axis may satisfy: ET6/CT6 is more than or equal to 0.1 and less than or equal to 0.9. The edge thickness and the center thickness of the sixth lens are reasonably configured, so that the manufacturability of the sixth lens is ensured, the size of the sixth lens is reduced, and meanwhile, the deflection of light rays at the sixth lens can be slowed down.
In an exemplary embodiment, the center thickness CT6 of the sixth lens on the optical axis, the center thickness CT7 of the seventh lens on the optical axis, and the air interval T67 of the sixth lens and the seventh lens on the optical axis may satisfy: the ratio of (CT6+CT7)/T67 is more than or equal to 0.7 and less than or equal to 3.0. 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 is reasonably configured, so that the astigmatism of the wide-angle lens can be controlled.
In an exemplary embodiment, the maximum image height IH corresponding to the maximum field angle of the wide-angle lens and the optical total length TTL of the wide-angle lens may satisfy: TTL/IH is less than or equal to 2.5 and less than or equal to 4.1. The optical total length of the wide-angle lens and the maximum image height corresponding to the maximum field angle are reasonably configured, so that the optical total 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 back focal length BFL of the wide-angle lens and the total effective focal length F of the wide-angle lens may satisfy: BFL/F is more than or equal to 0.1 and less than or equal to 0.3. The ratio of the back focal length of the wide-angle lens to the total effective focal length of the wide-angle lens is reasonably configured, so that balance is achieved between good imaging quality of the wide-angle lens and easy-to-assemble back focal length of the wide-angle lens, and the difficulty of an assembly process of the wide-angle lens is reduced while the imaging quality of the wide-angle lens is ensured.
In an exemplary embodiment, the maximum image height IH corresponding to the maximum field angle of the wide-angle lens and the entrance pupil diameter ENPD of the wide-angle lens may satisfy: IH/ENPD is more than or equal to 3.0 and less than or equal to 3.8. 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 reasonably configured, 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 brightness of the image plane of the wide-angle lens is improved.
The wide-angle lens according to the above embodiment of the present application may employ a plurality of lenses, for example, the seven lenses described above, and by reasonably distributing optical parameters such as optical power, surface shape, center thickness of each lens, and on-axis spacing between each lens, the wide-angle lens can be adapted to a high-low temperature environment, and at least one of high resolution, large field angle, large image plane, and miniaturization of the wide-angle lens can be achieved. The wide-angle lens provided by the application 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 application, at least one of the mirrors of each of the first to seventh lenses is an aspherical mirror. 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 may be varied to achieve the various results and advantages described in this specification without departing from the technical solutions claimed herein.
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 application is described below with reference to fig. 1. Fig. 1 is a schematic structural view of a wide-angle lens according to embodiment 1 of the present application.
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 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 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 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 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 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, the liquid crystal display device comprises a liquid crystal display device,x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Table 2 shows the cone coefficients k and the higher order coefficients A that can be used for each of the aspherical mirror surfaces 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 | 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 2
Example 2
A wide-angle lens according to embodiment 2 of the present application is described below with reference to fig. 2. Fig. 2 is a schematic structural view of a wide-angle lens according to embodiment 2 of the present application.
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 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 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 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 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 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 | 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 4 Table 4
Example 3
A wide-angle lens according to embodiment 3 of the present application is described below with reference to fig. 3. Fig. 3 is a schematic structural view of a wide-angle lens according to embodiment 3 of the present application.
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 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 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 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 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 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).
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 。
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TABLE 6
Example 4
A wide-angle lens according to embodiment 4 of the present application 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 application.
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 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 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 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 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 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 application 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 application.
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 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 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 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 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 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).
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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 。
| Face number | k | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S3 | -5.410 | 7.55E-04 | -2.21E-05 | 3.65E-07 | -1.22E-08 | -1.04E-09 | 1.86E-10 | -1.03E-11 |
| S4 | 23.157 | 1.94E-03 | -9.54E-05 | -6.37E-06 | -9.58E-07 | -2.57E-07 | 6.73E-08 | -8.05E-09 |
| S5 | -123 | -1.24E-04 | -4.96E-05 | -3.69E-05 | 3.55E-06 | 3.98E-08 | -3.67E-09 | -1.58E-09 |
| S6 | -2.729 | 7.94E-03 | -3.21E-03 | 5.28E-04 | 9.05E-05 | -4.24E-05 | 4.02E-06 | 1.10E-07 |
| S7 | 28.567 | 3.15E-03 | -3.41E-03 | -3.77E-04 | 1.62E-04 | 2.51E-06 | -6.90E-06 | -2.06E-06 |
| S8 | -8.141 | -1.25E-02 | -3.52E-04 | 9.29E-05 | 2.10E-06 | -7.27E-06 | 4.76E-07 | 4.04E-08 |
| S9 | 0.580 | -3.36E-03 | 7.64E-04 | 3.43E-05 | 2.40E-05 | -1.53E-06 | -7.85E-07 | 8.18E-08 |
| S10 | -8.234 | -3.46E-03 | 9.44E-04 | 3.28E-05 | -7.81E-06 | 2.15E-07 | 7.12E-08 | -1.31E-08 |
| S11 | -3.531 | -5.68E-03 | 1.63E-04 | -2.53E-05 | 1.31E-06 | -1.28E-07 | -1.16E-08 | 5.63E-10 |
| S12 | -50.004 | -2.90E-03 | -2.23E-04 | 9.55E-06 | -4.68E-07 | -1.25E-08 | -7.07E-09 | 2.58E-10 |
| S13 | 6.685 | -2.28E-02 | 1.55E-03 | -5.31E-05 | -1.14E-06 | -3.03E-08 | 2.58E-08 | -1.07E-09 |
| S14 | -50 | -1.10E-02 | 5.59E-04 | -1.86E-05 | 1.24E-07 | 1.16E-08 | 2.56E-10 | -1.92E-11 |
Table 10
Example 6
A wide-angle lens according to embodiment 6 of the present application is described below with reference to fig. 6. Fig. 6 is a schematic structural view of a wide-angle lens according to embodiment 6 of the present application.
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 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 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 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 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 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 |
Table 12
In summary, the conditional expressions in embodiment 1 to embodiment 6 satisfy the relationship shown in table 13.
| Condition/example | 1 | 2 | 3 | 4 | 5 | 6 |
| D/F1 | -0.858 | -0.785 | -0.914 | -0.960 | -1.144 | -1.015 |
| F1/F | -2.536 | -2.264 | -2.620 | -2.526 | -1.867 | -2.039 |
| (R21-R22)/(R21+R22) | 0.018 | 0.158 | 0.310 | 0.135 | -0.149 | -0.061 |
| F3/F | 2.894 | 1.982 | 2.316 | 2.006 | 2.765 | 2.337 |
| F4/F | 1.584 | 1.674 | 1.752 | 2.206 | 1.560 | 1.938 |
| F5/F | -6.475 | -7.272 | -5.151 | -6.860 | -4.755 | -4.939 |
| F6/F | 8.165 | 6.208 | 3.162 | 2.902 | 5.669 | 2.722 |
| F7/F | -1.514 | -1.498 | -1.274 | -1.193 | -1.597 | -1.256 |
| F34/F | 1.051 | 0.955 | 1.091 | 1.126 | 1.040 | 1.158 |
| F7/F1 | 0.597 | 0.662 | 0.486 | 0.472 | 0.855 | 0.616 |
| F12/F67 | 1.104 | 0.833 | 0.657 | 0.740 | 0.795 | 0.569 |
| ∑CT/TTL | 0.651 | 0.550 | 0.595 | 0.600 | 0.583 | 0.615 |
| ET1/CT1 | 2.886 | 1.576 | 1.828 | 1.739 | 1.502 | 1.621 |
| R11/CT1 | 30.446 | 9.173 | 15.941 | 14.629 | 11.475 | 15.064 |
| T12/TTL | 0.108 | 0.145 | 0.180 | 0.188 | 0.166 | 0.177 |
| ET4/CT4 | 0.655 | 0.400 | 0.490 | 0.479 | 0.322 | 0.584 |
| T34/F34 | 0.028 | 0.032 | 0.085 | 0.059 | 0.046 | 0.053 |
| ET6/CT6 | 0.655 | 0.581 | 0.408 | 0.368 | 0.591 | 0.333 |
| (CT6+CT7)/T67 | 1.186 | 1.677 | 1.610 | 1.935 | 0.998 | 2.260 |
| TTL/IH | 3.793 | 2.784 | 3.581 | 3.618 | 3.813 | 3.608 |
| BFL/F | 0.234 | 0.269 | 0.275 | 0.258 | 0.235 | 0.278 |
| IH/ENPD | 3.297 | 3.634 | 3.559 | 3.618 | 3.255 | 3.537 |
TABLE 13
The present application 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 foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (10)
1. The wide-angle lens is characterized by comprising, in order from an object side to an image side along an optical axis:
the first lens is provided with negative focal power, and the object side surface of the first lens is a convex surface;
a second lens having optical power;
a third lens having positive optical power, and an image side surface thereof being a convex surface;
a fourth lens having positive optical power;
a fifth lens having negative optical power;
a sixth lens having positive optical power, the object side surface of which is a convex surface; and
and a seventh lens having negative optical power.
2. The wide-angle lens of claim 1, wherein the maximum optical aperture D of the wide-angle lens and the effective focal length F1 of the first lens satisfy: -1.4-0.5D/F1.
3. The wide-angle lens of claim 1, wherein the radius of curvature R21 of the object-side surface of the second lens and the radius of curvature R22 of the image-side surface of the second lens satisfy: -0.2 < R21-R22)/(R21+R22) < 1.0.
4. The wide-angle lens of claim 1, wherein an effective focal length F1 of the first lens and an effective focal length F7 of the seventh lens satisfy: F7/F1 is more than or equal to 0.2 and less than or equal to 1.1.
5. The wide-angle lens of claim 1, wherein a combined focal length F12 of the first lens and the second lens and a combined focal length F67 of the sixth lens and the seventh lens satisfy: F12/F67 is more than or equal to 0.4 and less than or equal to 1.3.
6. The wide-angle lens of claim 1, wherein a sum Σct of center thicknesses of each of the first to seventh lenses on the optical axis and an optical total length TTL of the wide-angle lens satisfy: sigma CT/TTL is more than or equal to 0.3 and less than or equal to 0.9.
7. The wide-angle lens of claim 1, wherein an air space T34 of the third lens and the fourth lens on the optical axis and a combined focal length F34 of the third lens and the fourth lens satisfy: T34/F34 is more than or equal to 0 and less than or equal to 0.2.
8. The wide-angle lens of claim 1, wherein a center thickness CT6 of the sixth lens on the optical axis, a center thickness CT7 of the seventh lens on the optical axis, and an air interval T67 of the sixth lens and the seventh lens on the optical axis satisfy: the ratio of (CT6+CT7)/T67 is more than or equal to 0.7 and less than or equal to 3.0.
9. The wide-angle lens of claim 1, wherein a maximum image height IH corresponding to a maximum field angle of the wide-angle lens and an optical total length TTL of the wide-angle lens satisfy: TTL/IH is less than or equal to 2.5 and less than or equal to 4.1.
10. The wide-angle lens of claim 1, wherein a back focal length BFL of the wide-angle lens and a total effective focal length F of the wide-angle lens satisfy: BFL/F is more than or equal to 0.1 and less than or equal to 0.3.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310595634.5A CN116500757A (en) | 2023-05-24 | 2023-05-24 | Wide-angle lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310595634.5A CN116500757A (en) | 2023-05-24 | 2023-05-24 | Wide-angle lens |
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| CN116500757A true CN116500757A (en) | 2023-07-28 |
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| CN202310595634.5A Pending CN116500757A (en) | 2023-05-24 | 2023-05-24 | Wide-angle lens |
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