Wide-angle lens, image pickup device and electronic device

Abstract

The present application discloses a wide-angle lens, an image pickup device and an electronic device. The wide-angle lens includes: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the image side along the optical axis. The first lens has a negative refractive power, and its object side surface is a concave surface at the optical axis; the second lens has a positive refractive power; the third lens has a refractive power; the fourth lens has a positive refractive power; the fifth lens has a negative refractive power, and its object side surface is a convex surface at the optical axis; the sixth lens has a positive refractive power, and its image side surface is a convex surface at the optical axis; the seventh lens has a negative refractive power, and its object side surface is a convex surface at the optical axis, and its image side surface is a concave surface at the optical axis. The field of view FOV of the wide-angle lens satisfies FOV>125°.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and particularly to a wide-angle lens, an image pickup device, and an electronic device. Background Art

[0002] In recent years, with the rapid update and iteration of products such as computers, drones, smartphones, tablets, machine vision systems, and vehicle-mounted systems, optical lenses with various performance characteristics have been continuously improved and innovated in related fields. The shooting effect of optical lenses has become the focus of people's expectations for technological progress. Especially with the popularization of smartphones in life, in addition to requiring the optical lens to have a thin, light, short, and small shape and possess characteristics such as high pixels and high resolution, it is also required that the optical lens has a relatively wide field of view angle to capture a larger area of scenery.

[0003] However, the inventor has found that the field of view angle of traditional wide-angle optical lenses is still small, making it difficult to meet the shooting requirements for large-scale subjects such as buildings, landscapes, and mountains. Summary of the Invention

[0004] Based on this, in view of the problem of the small field of view angle of traditional wide-angle optical lenses, it is necessary to provide an improved wide-angle lens.

[0005] A wide-angle lens, which sequentially includes, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. Among them, the first lens has a negative refractive power, and its object side surface is concave at the optical axis; the second lens has a positive refractive power; the third lens has a refractive power; the fourth lens has a positive refractive power; the fifth lens has a negative refractive power, and its object side surface is convex at the optical axis; the sixth lens has a positive refractive power, and its image side surface is convex at the optical axis; the seventh lens has a negative refractive power, and its object side surface is convex at the optical axis, and its image side surface is concave at the optical axis. The field of view angle FOV of the wide-angle lens satisfies FOV > 125°.

[0006] The above wide-angle lens, by reasonably distributing the refractive powers and surface shapes of each lens, enables the wide-angle lens to have an imaging effect of large wide-angle and deep depth of field and a miniaturized structural feature.

[0007] In one embodiment, the wide-angle lens satisfies the following relationship: 0.6 < f / ImgH < 1; where f is the total effective focal length of the wide-angle lens, and ImgH is half of the diagonal length of the effective pixel area of the photosensitive element on the imaging surface of the wide-angle lens.

[0008] If the ratio is too large, the wide-angle imaging effect of the wide-angle lens cannot be achieved; if it is too small, the depth of field will be shallow, affecting the picture effect. When the above relationship is satisfied, it can not only meet the shooting requirements of wide-angle, but also ensure that the wide-angle lens has a long depth-of-field range, so that an image with clear foreground and background can be obtained.

[0009] In one embodiment, the wide-angle lens satisfies the following relational expression: tan(FOV) / TTL > -0.4; where tan(FOV) is the tangent value of the field of view angle of the wide-angle lens, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the wide-angle lens.

[0010] When the above relationship is satisfied, the field of view angle of the wide-angle lens can be expanded while reducing the total length of the wide-angle lens on the optical axis, which is beneficial to the miniaturization of the wide-angle lens.

[0011] In one embodiment, the wide-angle lens satisfies the following relational expression: -2 < f6 / R12 < -1.4; where f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

[0012] If the absolute value of this ratio is too large, it is not conducive to reducing the total length of the wide-angle lens; if it is too small, it cannot ensure that the sixth lens provides positive refractive power. When the above relational expression is satisfied, it can ensure that the sixth lens has positive refractive power to reduce the total length of the wide-angle lens on the optical axis, and further ensure the miniaturization of the wide-angle lens.

[0013] In one embodiment, the wide-angle lens satisfies the following relational expression: 0.5mm < BFL < 0.65mm; where BFL is the shortest distance in the direction parallel to the optical axis from the image side surface of the seventh lens to the imaging surface of the wide-angle lens.

[0014] If this distance is too large, it is not conducive to the miniaturization of the wide-angle lens; if it is too small, the depth of focus of the wide-angle lens will be small. When the above relationship is satisfied, it can ensure that the wide-angle lens has a large depth of focus, so that the system has a sufficient focusing range to obtain more information about the object to be photographed, and at the same time, it can also improve the module assembly yield rate of the wide-angle lens.

[0015] In one embodiment, the wide-angle lens satisfies the following relational expression: TTL / ImgH < 3; where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the wide-angle lens, and ImgH is half of the diagonal length of the effective pixel area of the photosensitive element on the imaging surface of the wide-angle lens.

[0016] By controlling the total optical length and image height ratio of the wide-angle lens, the total size of the wide-angle lens can be effectively compressed, and the wide-angle lens can be miniaturized, so that the wide-angle lens can be better applied to devices with limited size such as portable electronic devices.

[0017] In one embodiment, the wide-angle lens satisfies the following relationship: f / f1<-0.4; wherein f is the total effective focal length of the wide-angle lens, and f1 is the effective focal length of the first lens.

[0018] By providing negative refractive power with the aid of the first lens, the wide-angle lens has a larger field of view. When the above relationship is satisfied, the total effective focal length of the wide-angle lens can be prevented from being too long, which is beneficial to distortion correction and ensures imaging quality and processability.

[0019] In one embodiment, the wide-angle lens satisfies the following relationship:

[0020] 0.8<(R9+R10) / (R9*R10)<1.5; wherein R9 is the radius of curvature of the object side of the fifth lens, and R10 is the radius of curvature of the image side of the fifth lens.

[0021] If this ratio is too large, the processability of the wide-angle lens will be poor, and if it is too small, it will be not conducive to correcting aberrations. By adjusting the radius of curvature of the object side of the fifth lens and the radius of curvature of the image side of the fifth lens to satisfy the above relationship, the contribution of the astigmatism of the object side and image side of the fifth lens can be effectively controlled, thereby effectively improving the aberration of the wide-angle lens while ensuring the processability of the shape of the fifth lens.

[0022] In one embodiment, the wide-angle lens satisfies the following relationship:

[0023] 0.3<(R7+R8) / |R7-R8|<3; wherein R7 is the radius of curvature of the object side of the fourth lens, and R8 is the radius of curvature of the image side of the fourth lens.

[0024] If the absolute value of this ratio is too large, it will lead to poor processability of the wide-angle lens, and if it is too small, it will affect the imaging quality of the wide-angle lens. By controlling the ratio of the radius of curvature of the object side of the fourth lens to the radius of curvature of the image side of the fourth lens, the incident angle of the light can be appropriately increased to meet the image height requirement of the wide-angle lens, while reducing the assembly sensitivity of the wide-angle lens, thereby ensuring the assembly stability of the wide-angle lens.

[0025] In one embodiment, the wide-angle lens satisfies the following relational expression: 2 < ΣCT / f < 2.5; where ΣCT is the sum of the central thicknesses of the first lens to the seventh lens on the optical axis respectively, and f is the total effective focal length of the wide-angle lens.

[0026] If this ratio is too large, it is not easy to make the lens thin; if it is too small, the processability of the wide-angle lens is poor; by controlling the ratio of the total central thickness of each lens to the wide-angle lens to satisfy the above relationship, the tolerance sensitivity of the lens group can be reduced, enabling the lens group to have a compact structural combination and ensuring good processing technology for the wide-angle lens.

[0027] In one embodiment, the wide-angle lens satisfies the following relational expression: 0.6 < ΣCT / TTL < 0.65; where ΣCT is the sum of the central thicknesses of the first lens to the seventh lens on the optical axis respectively, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the wide-angle lens.

[0028] If this ratio is too large, it is not easy to make the lens thin; if it is too small, it is not conducive to distortion correction; by controlling the ratio of the total central thickness of each lens to the optical total length of the wide-angle lens to satisfy the above relationship, the distortion can be effectively controlled within a reasonable range, ensuring the imaging quality, and at the same time effectively shortening the total size of the wide-angle lens to achieve miniaturization of the wide-angle lens.

[0029] In one embodiment, the wide-angle lens satisfies the following relational expression: 1.4 < ET5 / CT5 < 1.7; where ET5 is the thickness at the maximum effective radius of the fifth lens, and CT5 is the central thickness of the fifth lens on the optical axis.

[0030] If this ratio is too large, it will result in poor processability of the wide-angle lens; if it is too small, it will affect the imaging quality of the wide-angle lens; by controlling the ratio of the edge thickness of the fifth lens to the central thickness of the fifth lens to satisfy the above relationship, the imaging quality can be ensured while reducing the assembly sensitivity of the wide-angle lens.

[0031] In one embodiment, the wide-angle lens satisfies the following relational expression: 1 < ET7 / CT7 < 2.5; where ET7 is the thickness at the maximum effective radius of the seventh lens, and CT7 is the central thickness of the seventh lens on the optical axis.

[0032] If the ratio is too large, it will lead to poor processability of the wide-angle lens, while if it is too small, it will be unfavorable for the correction of aberrations and optical performance of the wide-angle lens. The seventh lens is used to perform final correction on the aberrations and optical performance of the wide-angle lens, and the ratio of the edge thickness of the seventh lens to the center thickness of the seventh lens is controlled within a reasonable range to ensure the molding yield of the wide-angle lens and improve the assembly stability of the wide-angle lens.

[0033] The present application also provides an image pickup device.

[0034] An image pickup device comprises the wide-angle lens as described above; and a photosensitive element, wherein the photosensitive element is arranged on the image side of the wide-angle lens to receive light of an image formed by the wide-angle lens.

[0035] The above-mentioned image pickup device, using a wide-angle lens with a large field of view, can obtain image information of large scenes, and can also be adapted to devices with limited size such as portable electronic devices.

[0036] The present application also provides an electronic device, comprising a housing; and the image pickup device as described above, wherein the image pickup device is mounted on the housing to acquire images.

[0037] The electronic device mentioned above can capture images with large scenes and deep depth of field by using the image pickup device as described above, thus meeting people's professional photography needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of a wide-angle lens according to Embodiment 1 of the present application is shown;

[0039] FIG. 2A to FIG. 2C The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens of Example 1 are respectively shown;

[0040] Figure 3 A schematic structural diagram of a wide-angle lens according to Embodiment 2 of the present application is shown;

[0041] FIG. 4A to FIG. 4C The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens of Example 2 are respectively shown;

[0042] Figure 5 A schematic structural diagram of a wide-angle lens according to Embodiment 3 of the present application is shown;

[0043] FIG. 6A to FIG. 6C The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens of Example 3 are respectively shown;

[0044] Figure 7 A schematic structural diagram of a wide-angle lens according to Embodiment 4 of the present application is shown;

[0045] FIG. 8A to FIG. 8C The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens of Example 4 are respectively shown;

[0046] Fig. 9 A schematic structural diagram of a wide-angle lens according to Embodiment 5 of the present application is shown;

[0047] FIG. 10A to FIG. 10C The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the wide-angle lens of Example 5 are respectively shown;

[0048] Fig.11 A schematic structural diagram of a wide-angle lens according to Embodiment 6 of the present application is shown;

[0049] FIG. 12A to FIG. 12C The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the wide-angle lens of Example 6 are respectively shown. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure of the present invention more thoroughly and comprehensively.

[0051] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "rear", "circumferential" and similar expressions used herein are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0052] It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens. At the same time, in this specification, the surface of each lens closest to the object is called the object side surface, and the surface of each lens closest to the imaging surface is called the image side surface.

[0053] In the accompanying drawings, for the sake of convenience, the shapes of spherical or aspherical surfaces shown in the accompanying drawings are shown by way of example. That is, the shapes of spherical or aspherical surfaces are not limited to the shapes of spherical or aspherical surfaces shown in the accompanying drawings. The accompanying drawings are only examples and are not drawn strictly to scale.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0055] The features, principles and other aspects of the present application are described in detail below.

[0056] The wide-angle lens of the embodiment of the present application includes seven lenses with refractive power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis.

[0057] The first lens has negative refractive power, and its object side surface is concave at the optical axis, which is used to increase the field of view of the wide-angle lens; the second lens has positive refractive power, and is used to cooperate with the first lens to correct the astigmatism of the wide-angle lens; the third lens has positive refractive power or negative refractive power, and is used to cooperate with other lenses to fine-tune the optical performance of the wide-angle lens, avoid the lenses in the wide-angle lens from being too thin or too thick, and improve the assembly stability of the system; the fourth lens has positive refractive power, and is used to cooperate with the fifth lens to correct the chromatic aberration of the system; the fifth lens has negative refractive power, and its object side surface is convex at the optical axis, and is used to cooperate with the fourth lens to correct the chromatic aberration of the system; the sixth lens has positive refractive power, and its image side surface is convex at the optical axis, which is used to shorten the total length of the wide-angle lens; the seventh lens has negative refractive power, and its object side surface is convex at the optical axis, and its image side surface is concave at the optical axis, which is used to make the final correction to the aberration and optical performance of the wide-angle lens.

[0058] The field of view FOV of the wide-angle lens satisfies FOV>125°. When the wide-angle lens is used for imaging, the light emitted or reflected by the object enters the wide-angle lens from the object side, and passes through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens in sequence, and finally converges on the imaging surface. Such a configuration can realize the wide-angle characteristics of the wide-angle lens, so as to fully obtain the information of the large scene and meet the field of view requirements of portable electronic devices.

[0059] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: f / f1 < -0.4; where f is the total effective focal length of the wide-angle lens, and f1 is the effective focal length of the first lens. By controlling 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 total effective focal length of the wide-angle lens can be prevented from being too long, which is beneficial to the distortion correction of the wide-angle lens and ensures the imaging quality and processability.

[0060] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.3 < (R7 + R8) / |R7 - R8| < 3; where R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. If the absolute value of this ratio is too large, the processability of the wide-angle lens will be poor; if it is too small, the imaging quality of the wide-angle lens will be affected. By controlling the ratio of the radius of curvature of the object side surface of the fourth lens to the radius of curvature of the image side surface of the fourth lens, the incident angle of light can be appropriately increased to meet the image height requirement of the wide-angle lens, and at the same time, the assembly sensitivity can be reduced to ensure the assembly stability of the wide-angle lens.

[0061] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.8 < (R9 + R10) / (R9 * R10) < 1.5; where R9 is the radius of curvature of the object side surface of the fifth lens, and R10 is the radius of curvature of the image side surface of the fifth lens. If this ratio is too large, the processability of the wide-angle lens will be poor; if it is too small, it is not conducive to correcting aberrations. By adjusting the radius of curvature of the object side surface of the fifth lens and the radius of curvature of the image side surface of the fifth lens to satisfy the above relationship, the contribution of astigmatism of the object side surface and the image side surface of the fifth lens can be effectively controlled, thereby effectively improving the aberrations of the wide-angle lens and ensuring the processability of the shape of the fifth lens at the same time.

[0062] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 1.4 < ET5 / CT5 < 1.7; where ET5 is the thickness at the maximum effective radius of the fifth lens, and CT5 is the central thickness of the fifth lens on the optical axis. If this ratio is too large, the processability of the wide-angle lens will be poor; if it is too small, it will affect the imaging quality of the wide-angle lens. By controlling the ratio of the edge thickness of the fifth lens to the central thickness of the fifth lens within a reasonable range, the imaging quality can be ensured, and at the same time, the assembly sensitivity of the wide-angle lens can be reduced.

[0063] In an exemplary embodiment, the wide-angle lens satisfies the following relational expression: -2 < f6 / R12 < -1.4; where f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens. If the absolute value of this ratio is too large, it is not conducive to reducing the total length of the wide-angle lens; if it is too small, it cannot ensure that the sixth lens provides positive refractive power. By controlling the ratio of the effective focal length of the sixth lens to the radius of curvature of the image side surface of the sixth lens within a reasonable range, it can be ensured that the sixth lens has positive refractive power, which is conducive to reducing the total length of the wide-angle lens along the optical axis and further ensuring the miniaturization of the wide-angle lens.

[0064] In an exemplary embodiment, the wide-angle lens satisfies the following relational expression: 1 < ET7 / CT7 < 2.5; where ET7 is the thickness at the maximum effective radius of the seventh lens, and CT7 is the central thickness of the seventh lens on the optical axis. If this ratio is too large, it will lead to poor processability of the wide-angle lens; if it is too small, it is not conducive to correcting the aberrations and optical performance of the wide-angle lens. By controlling the ratio of the edge thickness of the seventh lens to the central thickness of the seventh lens within a reasonable range, good optical performance and molding yield of the wide-angle lens can be ensured, and at the same time, the assembly stability of the wide-angle lens can be improved.

[0065] In an exemplary embodiment, the wide-angle lens satisfies the following relational expression: 0.5 mm < BFL < 0.65 mm; where BFL is the shortest distance from the image side surface of the seventh lens to the imaging surface of the wide-angle lens in the direction parallel to the optical axis. If this distance is too large, it is not conducive to the miniaturization of the wide-angle lens; if it is too small, it will result in a smaller depth of field of the wide-angle lens. By controlling the distance from the vertex of the image side surface of the seventh lens to the imaging surface of the wide-angle lens on the optical axis within a reasonable range, it can be ensured that the wide-angle lens has a larger depth of field, so that the lens has a sufficient focusing range to obtain more information about the object to be photographed, and at the same time, the module assembly yield of the wide-angle lens can also be improved.

[0066] In an exemplary embodiment, the wide-angle lens satisfies the following relational expression: 0.6 < f / ImgH < 1; where f is the total effective focal length of the wide-angle lens, and ImgH is half of the diagonal length of the effective pixel area of the photosensitive element on the imaging surface of the wide-angle lens. If this ratio is too large, the wide-angle imaging effect of the wide-angle lens cannot be achieved; if it is too small, the depth of field will be shallower, affecting the picture effect. When the above relationship is satisfied, the wide-angle lens can not only meet the shooting requirements of wide-angle, but also has a longer depth of field range, and thus can obtain clear images of both near and far scenes, meeting the professional shooting needs of the wide-angle lens.

[0067] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: tan(FOV) / TTL>-0.4; wherein tan(FOV) is the tangent value of the field of view of the wide-angle lens, and TTL is the distance from the object side of the first lens to the imaging surface of the wide-angle lens on the optical axis. When the above relationship is satisfied, the field of view of the wide-angle lens can be expanded while reducing the total length of the wide-angle lens on the optical axis, which is conducive to miniaturization of the wide-angle lens.

[0068] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: TTL / ImgH<3; wherein TTL is the distance from the object side of the first lens to the imaging surface of the wide-angle lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface of the wide-angle lens. By controlling the total optical length and image height ratio of the wide-angle lens within a reasonable range, the total size of the wide-angle lens can be effectively compressed, and the miniaturization of the wide-angle lens can be achieved, so that the wide-angle lens can be better applied to devices with limited size such as portable electronic devices.

[0069] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 2<ΣCT / f<2.5; wherein ΣCT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, and f is the total effective focal length of the wide-angle lens. If the ratio is too large, it is difficult to make the lens thinner, and if it is too small, the processability of the wide-angle lens is poor; by controlling the ratio of the total center thickness of each lens to the wide-angle lens within a reasonable range, the tolerance sensitivity of the lens group can be reduced, so that the lens group has a compact structural combination, and a good processing technology of the wide-angle lens is ensured.

[0070] In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.6<ΣCT / TTL<0.65; wherein ΣCT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, and TTL is the distance from the object side of the first lens to the imaging surface of the wide-angle lens on the optical axis. If this ratio is too large, it is difficult to make the lens thinner, and if it is too small, it is not conducive to distortion correction; by controlling the total center thickness of each lens and the total optical length of the wide-angle lens to satisfy the above relationship, the system distortion can be effectively controlled within a reasonable range, thereby ensuring the imaging quality, and at the same time, the total size of the wide-angle lens can be effectively shortened to achieve miniaturization of the wide-angle lens.

[0071] In an exemplary embodiment, the wide-angle lens is further provided with a stop for limiting the light beam to further improve the imaging quality of the lens. The stop may be an aperture stop or a field stop. Optionally, the stop may be provided between the second lens and the third lens, or between the third lens and the fourth lens. However, it should be understood by those skilled in the art that the stop may be provided at any position between the object side and the image side as required, that is, the setting of the stop should not be limited to between the first lens and the second lens or between the third lens and the fourth lens.

[0072] In an exemplary embodiment, the wide-angle lens further includes a filter for filtering out infrared light in the light.

[0073] According to the wide-angle lens of the above-mentioned embodiment of the present application, multiple lenses may be used, such as the seven lenses mentioned above. By reasonably allocating the refractive power and surface shape of each lens, the center thickness of each lens, and the on-axis spacing between each lens, a wide-angle lens with a field of view angle greater than 125° and an aperture number FNO of about 2.28 is proposed. This wide-angle lens not only has the characteristics of high pixels, deep depth of field, and miniaturization, but also has the advantage of a large wide angle, which can meet the professional shooting needs of large scenes such as buildings, scenery, mountains and rivers. It can be understood that although seven lenses are used as an example in the embodiment, the wide-angle lens is not limited to including seven lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0074] In the embodiment of the present application, at least one mirror surface of each lens is an aspherical mirror surface. Aspherical lenses have the advantages of improving distortion aberration and improving astigmatism aberration. After using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0075] Specific embodiments of the wide-angle lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0076] Example 1

[0077] The following reference Figures 1 to 2C The wide-angle lens of Example 1 of the present application is described.

[0078] Figure 1 FIG. 2 shows a schematic diagram of the structure of the wide-angle lens of Example 1. Figure 1 As shown, the wide-angle lens includes, in order from the object side to the image side along the 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, a seventh lens L7 and an imaging surface S17.

[0079] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces, wherein the object-side surface S1 is concave at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0080] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces, wherein the object-side surface S3 is convex at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0081] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces, wherein the object-side surface S5 is convex at the optical axis and is convex at the circumference, and the image-side surface S6 is convex at the optical axis and is convex at the circumference.

[0082] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and is concave at the circumference, and the image-side surface S8 is convex at the optical axis and is convex at the circumference.

[0083] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both aspherical surfaces, wherein the object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0084] The sixth lens L6 has positive refractive power, and its object-side surface S11 and image-side surface S12 are both aspherical surfaces, wherein the object-side surface S11 is convex at the optical axis and is convex at the circumference, and the image-side surface S12 is convex at the optical axis and is convex at the circumference.

[0085] The seventh lens has negative refractive power, and its object-side surface S13 and image-side surface S14 are both aspherical surfaces, wherein the object-side surface S13 is convex at the optical axis and concave at the circumference, and the image-side surface S14 is concave at the optical axis and convex at the circumference.

[0086] Optionally, the wide-angle lens further includes a filter L8 having an object side surface S15 and an image side surface S16. Light from the object OBJ passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17. Optionally, a stop STO is provided between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

[0087] Table 1 shows the surface type, paraxial radius of curvature, thickness, material, refractive index, Abbe number and effective focal length of each lens of the wide-angle lens of Example 1, wherein the units of the radius of curvature, thickness and effective focal length of each lens are all millimeters (mm). The reference wavelength is 555nm.

[0088] Table 1

[0089]

[0090] In this embodiment, each lens may be an aspherical lens, and the aspherical surface type x of each lens is defined by the following formula:

[0091]

[0092] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 2 lists the high-order coefficients A4, A6, A8, A10, A12, A14, A15, A17 and A18 that can be used for each aspheric mirror surface S1-S12 in Example 1.

[0093] Table 2

[0094]

[0095]

[0096] In addition, half of the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens is 1.815 mm. Therefore, combining the data in Table 1 and Table 2, it can be seen that the wide-angle lens in Example 1 satisfies:

[0097] f / f1=-0.7, where f is the total effective focal length of the wide-angle lens, and f1 is the effective focal length of the first lens L1;

[0098] (R7+R8) / |R7-R8|=2.71, wherein R7 is the paraxial curvature radius of the object-side surface S7 of the fourth lens L4, and R8 is the paraxial curvature radius of the image-side surface S8 of the fourth lens L4;

[0099] (R9+R10) / (R9*R10)=1.21, unit: mm -1 , wherein R9 is the paraxial curvature radius of the object side surface S9 of the fifth lens, and R10 is the paraxial curvature radius of the image side surface S10 of the fifth lens L5;

[0100] ET5 / CT5=1.69, wherein ET5 is the edge thickness of the fifth lens L5, and CT5 is the center thickness of the fifth lens L5 at the optical axis;

[0101] f6 / R12=-1.56, wherein f6 is the effective focal length of the sixth lens L6, and R12 is the paraxial curvature radius of the image-side surface S12 of the sixth lens L6;

[0102] ET7 / CT7=1.98, wherein ET7 is the edge thickness of the seventh lens L7, and CT7 is the center thickness of the seventh lens L7 at the optical axis;

[0103] BFL=0.6 mm, where BFL is the shortest distance from the image side surface S14 of the seventh lens L7 to the imaging surface S17 of the wide-angle lens in a direction parallel to the optical axis;

[0104] f / ImgH=0.63, where f is the total effective focal length of the wide-angle lens, and ImgH is half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens;

[0105] tan(FOV) / TTL=-0.37, unit: mm -1 , where tan(FOV) is the tangent value of the field of view of the wide-angle lens, and TTL is the distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S17 of the wide-angle lens on the optical axis;

[0106] TTL / ImgH=2.12, where TTL is the distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S17 of the wide-angle lens on the optical axis, and ImgH is half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens;

[0107] ΣCT / f=2.04, where ΣCT is the sum of the center thicknesses of the first lens L1 to the seventh lens L7 on the optical axis, and f is the total effective focal length of the wide-angle lens;

[0108] ΣCT / TTL=0.61, wherein ΣCT is the sum of the center thicknesses of the first lens L1 to the seventh lens L7 on the optical axis, and TTL is the distance from the center of the object-side surface S1 of the first lens L1 to the imaging surface S17 of the wide-angle lens on the optical axis.

[0109] Figure 2A The longitudinal spherical aberration of the wide-angle lens of Example 1 is shown, and the curves in the figure respectively represent the deviation of light rays with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm from the focal point behind the lens; Figure 2B 1 shows the astigmatism curve of the wide-angle lens of Example 1, which indicates the meridional image curvature and the sagittal image curvature; Figure 2C The distortion curve of the wide-angle lens of Example 1 is shown, which indicates the distortion magnitude value under different viewing angles. FIG. 2A to FIG. 2C It can be seen that the wide-angle lens provided in Example 1 can achieve good imaging quality.

[0110] Example 2

[0111] The following reference Figures 3 to 4C The wide-angle lens of Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of a wide-angle lens according to Embodiment 2 of the present application is shown.

[0112] like Figure 3As shown, the wide-angle lens includes, in order from the object side to the image side along the 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, a seventh lens L7 and an imaging surface S17.

[0113] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces, wherein the object-side surface S1 is concave at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0114] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces, wherein the object-side surface S3 is convex at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0115] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces, wherein the object-side surface S5 is convex at the optical axis and is convex at the circumference, and the image-side surface S6 is concave at the optical axis and is concave at the circumference.

[0116] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is convex at the optical axis and is convex at the circumference, and the image-side surface S8 is convex at the optical axis and is convex at the circumference.

[0117] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both aspherical surfaces, wherein the object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0118] The sixth lens L6 has positive refractive power, and its object-side surface S11 and image-side surface S12 are both aspherical surfaces, wherein the object-side surface S11 is convex at the optical axis and is convex at the circumference, and the image-side surface S12 is convex at the optical axis and is convex at the circumference.

[0119] The seventh lens has negative refractive power, and its object-side surface S13 and image-side surface S14 are both aspherical surfaces, wherein the object-side surface S13 is convex at the optical axis and concave at the circumference, and the image-side surface S14 is concave at the optical axis and convex at the circumference.

[0120] Optionally, the wide-angle lens further includes a filter L8 having an object side surface S15 and an image side surface S16. Light from the object OBJ passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17. Optionally, a stop STO is provided between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

[0121] Table 3 shows the surface type, paraxial radius of curvature, thickness, material, refractive index, Abbe number and effective focal length of each lens of the wide-angle lens of Example 2, wherein the units of the radius of curvature, thickness and effective focal length of each lens are all in millimeters (mm); Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the aspherical surface type can be defined by the formula (1) given in Example 1; Table 5 shows the values ​​of the relevant parameters of the wide-angle lens given in Example 2, wherein half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens ImgH is 1.815mm. The reference wavelength is 555nm.

[0122] Table 3

[0123]

[0124]

[0125] Table 4

[0126] Surface number K A4 A6 A8 A10 A12 A14 A16 A17 A18 S1 2.83E-01 1.63E+00 -5.10E+00 1.33E+01 -2.55E+01 3.44E+01 -3.13E+01 1.83E+01 -6.13E+00 9.00E-01 S2 1.19E-01 2.03E+00 -5.20E+00 1.09E+01 -1.01E+01 -1.43E+01 2.22E+01 0.00E+00 0.00E+00 0.00E+00 S3 -1.30E+01 1.72E-01 -3.15E+00 2.62E+00 1.35E+01 -3.46E+01 3.99E+01 0.00E+00 0.00E+00 0.00E+00 S4 7.46E+00 -6.27E-02 2.05E+00 -4.10E+01 5.35E+02 -2.64E+03 5.47E+03 0.00E+00 0.00E+00 0.00E+00 S5 4.61E+00 1.11E-01 2.11E+00 -5.86E+00 1.26E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 1.00E+01 -7.78E-02 -1.86E+00 1.98E+01 -4.59E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S7 5.16E+00 1.55E-01 -2.70E+00 1.49E+01 -2.49E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 1.69E+00 -2.57E+00 2.52E+01 -2.42E+02 1.80E+03 -9.64E+03 3.42E+04 -7.04E+04 6.34E+04 0.00E+00 S9 -7.99E+01 -2.55E+00 1.95E+01 -2.16E+02 1.81E+03 -1.03E+04 3.60E+04 -6.99E+04 5.68E+04 0.00E+00 S10 -1.17E-01 -1.12E+00 1.14E-01 1.43E+01 -8.31E+01 2.53E+02 -4.33E+02 3.92E+02 -1.46E+02 0.00E+00 S11 -9.00E+00 4.44E-02 -3.03E+00 1.91E+01 -7.67E+01 1.90E+02 -2.71E+02 2.05E+02 -6.39E+01 0.00E+00 S12 -1.29E+00 7.30E-01 -3.40E+00 1.27E+01 -3.50E+01 6.11E+01 -6.52E+01 3.91E+01 -1.00E+01 0.00E+00 S13 -4.18E+01 -3.99E-01 -2.16E+00 1.12E+01 -2.82E+01 3.95E+01 -3.09E+01 1.26E+01 -2.12E+00 0.00E+00 S14 -4.64E+00 -6.75E-01 1.26E+00 -1.75E+00 1.58E+00 -9.32E-01 3.51E-01 -7.70E-02 7.40E-03 0.00E+00

[0127] Table 5

[0128] f / f1 -0.69 ET7 / CT7 2.05 BFL(mm) 0.6 f / I 0.63 (R7+R8) / |R7-R8| 0.8 <![CDATA[tan(FOV) / TTL(mm -1 )]]> -0.36 <![CDATA[(R9+R10) / (R9*R10)(mm -1 )]]> 1.22 TTL / ImgH 2.12 ET5 / CT5 1.68 ΣCT / f 2.05 f6 / R12 -1.60 ΣCT / TTL 0.61

[0129] Figure 4A The longitudinal spherical aberration of the wide-angle lens of Example 2 is shown, which indicates that light rays of different wavelengths deviate from the focal point behind the lens; Figure 4B 1 shows the astigmatism curve of the wide-angle lens of Example 2, which indicates the meridional image curvature and the sagittal image curvature; Figure 4C The distortion curve of the wide-angle lens of Example 2 is shown, which indicates the distortion magnitude value under different viewing angles. FIG. 4A to FIG. 4C It can be seen that the wide-angle lens provided in Example 2 can achieve good imaging quality.

[0130] Example 3

[0131] The following reference Figures 5 to 6C The wide-angle lens of Example 3 of the present application is described. Figure 3 A schematic structural diagram of a wide-angle lens according to Embodiment 3 of the present application is shown.

[0132] like Figure 5 As shown, the wide-angle lens includes, in order from the object side to the image side along the 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, a seventh lens L7 and an imaging surface S17.

[0133] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces, wherein the object-side surface S1 is concave at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0134] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces, wherein the object-side surface S3 is convex at the optical axis and concave at the circumference, and the image-side surface S2 is convex at the optical axis and convex at the circumference.

[0135] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces, wherein the object-side surface S5 is concave at the optical axis and is concave at the circumference, and the image-side surface S6 is convex at the optical axis and is concave at the circumference.

[0136] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is convex at the optical axis and is convex at the circumference, and the image-side surface S8 is convex at the optical axis and is convex at the circumference.

[0137] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both aspherical surfaces, wherein the object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0138] The sixth lens L6 has positive refractive power, and its object-side surface S11 and image-side surface S12 are both aspherical surfaces, wherein the object-side surface S11 is convex at the optical axis and is convex at the circumference, and the image-side surface S12 is convex at the optical axis and is convex at the circumference.

[0139] The seventh lens has negative refractive power, and its object-side surface S13 and image-side surface S14 are both aspherical surfaces, wherein the object-side surface S13 is convex at the optical axis and concave at the circumference, and the image-side surface S14 is concave at the optical axis and convex at the circumference.

[0140] Optionally, the wide-angle lens further includes a filter L8 having an object side surface S15 and an image side surface S16. Light from the object OBJ passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17. Optionally, a stop STO is provided between the third lens L3 and the fourth lens L4 to further improve the imaging quality of the wide-angle lens.

[0141] Table 6 shows the surface type, paraxial radius of curvature, thickness, material, refractive index, Abbe number and effective focal length of each lens of the wide-angle lens of Example 3, wherein the units of the radius of curvature, thickness and effective focal length of each lens are all in millimeters (mm); Table 7 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the aspherical surface type can be defined by the formula (1) given in Example 1; Table 8 shows the values ​​of the relevant parameters of the wide-angle lens given in Example 3, wherein half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens ImgH is 1.815mm. The reference wavelength is 555nm.

[0142] Table 6

[0143]

[0144] Table 7

[0145] Surface number K A4 A6 A8 A10 A12 A14 A16 A17 A18 S1 -1.40E+00 1.09E+00 -2.52E+00 4.93E+00 -7.19E+00 7.44E+00 -5.28E+00 2.43E+00 -6.53E-01 7.77E-02 S2 6.25E-01 1.40E+00 -1.07E+00 -5.96E+00 3.77E+01 -8.49E+01 6.16E+01 0.00E+00 0.00E+00 0.00E+00 S3 -1.26E+01 -1.36E-01 -1.79E-01 -4.85E+00 1.74E+01 -1.64E+01 7.44E-01 0.00E+00 0.00E+00 0.00E+00 S4 1.00E+01 7.21E-02 -6.53E-02 -4.55E+00 2.67E+01 -4.50E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 -2.94E+00 3.32E-01 -2.66E+00 5.81E+00 -3.43E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 -9.00E+00 3.45E-01 -4.46E+00 3.81E+01 -1.28E+01 -8.54E+02 4.21E+03 0.00E+00 0.00E+00 0.00E+00 S7 -8.97E+00 6.75E-02 -1.07E+00 7.34E+00 3.43E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 1.24E+00 -1.59E+00 7.59E+00 -7.94E+01 8.80E+02 -6.92E+03 3.32E+04 -8.67E+04 9.49E+04 0.00E+00 S9 -7.99E+01 -2.21E+00 4.99E+00 -6.57E+01 7.10E+02 -4.58E+03 1.71E+04 -3.48E+04 2.94E+04 0.00E+00 S10 -8.83E-02 -1.06E+00 -8.75E-01 1.70E+01 -7.67E+01 2.01E+02 -3.18E+02 2.76E+02 -1.01E+02 0.00E+00 S11 3.89E+00 1.84E-01 -2.61E+00 1.30E+01 -4.49E+01 1.01E+02 -1.35E+02 9.78E+01 -2.97E+01 0.00E+00 S12 -1.29E+00 8.95E-01 -4.73E+00 1.72E+01 -4.32E+01 7.07E+01 -7.23E+01 4.21E+01 -1.05E+01 0.00E+00 S13 -5.03E+01 -4.38E-01 -1.64E+00 8.78E+00 -2.09E+01 2.71E+01 -1.96E+01 7.46E+00 -1.16E+00 0.00E+00 S14 -4.69E+00 -6.42E-01 1.14E+00 -1.44E+00 1.16E+00 -5.98E-01 1.95E-01 -3.68E-02 3.09E-03 0.00E+00

[0146] Table 8

[0147] f / f1 -0.67 ET7 / CT7 2.24 BFL(mm) 0.52 f / I 0.62 (R7+R8) / |R7-R8| 0.4 <![CDATA[tan(FOV) / TTL(mm -1 )]]> -0.34 <![CDATA[(R9+R10) / (R9*R10)(mm -1 )]]> 1.01 TTL / ImgH 2.26 ET5 / CT5 1.60 ΣCT / f 2.29 f6 / R12 -1.75 ΣCT / TTL 0.63

[0148] Fig. 6A The longitudinal spherical aberration of the wide-angle lens of Example 3 is shown, which indicates that light rays of different wavelengths deviate from the focal point behind the lens; Figure 6B 10 shows the astigmatism curve of the wide-angle lens of Example 3, which indicates the meridional image curvature and the sagittal image curvature; Figure 6C The distortion curve of the wide-angle lens of Example 3 is shown, which indicates the distortion magnitude value under different viewing angles. FIG. 6A to FIG. 6C It can be seen that the wide-angle lens provided in Example 3 can achieve good imaging quality.

[0149] Example 4

[0150] The following reference Figures 7 to 8C The wide-angle lens of Example 4 of the present application is described. Figure 7 A schematic structural diagram of a wide-angle lens according to Embodiment 4 of the present application is shown.

[0151] like Figure 7 As shown, the wide-angle lens includes, in order from the object side to the image side along the 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, a seventh lens L7 and an imaging surface S17.

[0152] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces, wherein the object-side surface S1 is concave at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0153] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces, wherein the object-side surface S3 is convex at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0154] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces, wherein the object-side surface S5 is concave at the optical axis and is convex at the circumference, and the image-side surface S6 is concave at the optical axis and is concave at the circumference.

[0155] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is convex at the optical axis and is convex at the circumference, and the image-side surface S8 is convex at the optical axis and is convex at the circumference.

[0156] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both aspherical surfaces, wherein the object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0157] The sixth lens L6 has positive refractive power, and its object-side surface S11 and image-side surface S12 are both aspherical surfaces, wherein the object-side surface S11 is concave at the optical axis and is convex at the circumference, and the image-side surface S12 is convex at the optical axis and is convex at the circumference.

[0158] The seventh lens has negative refractive power, and its object-side surface S13 and image-side surface S14 are both aspherical surfaces, wherein the object-side surface S13 is convex at the optical axis and concave at the circumference, and the image-side surface S14 is concave at the optical axis and convex at the circumference.

[0159] Optionally, the wide-angle lens further includes a filter L8 having an object side surface S15 and an image side surface S16. Light from the object OBJ passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17. Optionally, a stop STO is provided between the third lens L3 and the fourth lens L4 to further improve the imaging quality of the wide-angle lens.

[0160] Table 9 shows the surface type, paraxial radius of curvature, thickness, material, refractive index, Abbe number and effective focal length of each lens of the wide-angle lens of Example 4, wherein the units of the radius of curvature, thickness and effective focal length of each lens are all in millimeters (mm); Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the aspherical surface type can be defined by the formula (1) given in Example 1; Table 11 shows the values ​​of the relevant parameters of the wide-angle lens given in Example 4, wherein half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens ImgH is 1.815mm. The reference wavelength is 555nm.

[0161] Table 9

[0162]

[0163] Table 10

[0164] Surface number K A4 A6 A8 A10 A12 A14 A16 A17 A18 S1 -1.19E+00 1.12E+00 -2.71E+00 5.51E+00 -8.24E+00 8.68E+00 -6.20E+00 2.86E+00 -7.64E-01 8.99E-02 S2 6.98E-01 1.39E+00 -1.81E+00 -1.65E+00 2.27E+01 -5.50E+01 3.93E+01 0.00E+00 0.00E+00 0.00E+00 S3 -1.11E+01 -1.24E-01 -2.55E-01 -2.68E+00 -9.82E-01 3.67E+01 -4.93E+01 0.00E+00 0.00E+00 0.00E+00 S4 1.00E+01 -2.42E-03 1.76E+00 -1.33E+01 3.98E+01 -3.66E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S5 -9.96E+00 1.99E-01 -1.21E-01 -5.71E+00 1.66E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 -8.89E+00 6.94E-02 1.47E+00 -3.69E+01 5.51E+02 -3.24E+03 8.34E+03 0.00E+00 0.00E+00 0.00E+00 S7 -6.73E+00 2.35E-02 8.80E-01 -5.59E+00 2.77E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 1.00E+00 -1.65E+00 6.83E+00 -4.68E+01 5.12E+02 -4.62E+03 2.47E+04 -6.92E+04 7.95E+04 0.00E+00 S9 -8.87E+01 -2.30E+00 5.53E+00 -7.86E+01 8.75E+02 -5.64E+03 2.07E+04 -4.13E+04 3.46E+04 0.00E+00 S10 -1.42E-01 -1.01E+00 -1.34E+00 1.93E+01 -8.03E+01 1.94E+02 -2.87E+02 2.41E+02 -8.77E+01 0.00E+00 S11 -9.00E+00 3.59E-01 -2.73E+00 1.10E+01 -3.20E+01 6.32E+01 -7.76E+01 5.38E+01 -1.63E+01 0.00E+00 S12 -1.29E+00 9.88E-01 -5.46E+00 2.01E+01 -5.04E+01 8.15E+01 -8.19E+01 4.65E+01 -1.12E+01 0.00E+00 S13 -5.03E+01 -3.45E-01 -2.05E+00 9.63E+00 -2.13E+01 2.61E+01 -1.79E+01 6.48E+00 -9.63E-01 0.00E+00 S14 -4.69E+00 -5.90E-01 9.49E-01 -1.06E+00 7.50E-01 -3.36E-01 9.48E-02 -1.57E-02 1.19E-03 0.00E+00

[0165] Table 11

[0166] f / f1 -0.68 ET7 / CT7 2.22 BFL(mm) 0.55 f / I 0.63 (R7+R8) / |R7-R8| 0.35 <![CDATA[tan(FOV) / TTL(mm -1 )]]> -0.33 <![CDATA[(R9+R10) / (R9*R10)(mm -1 )]]> 1.03 TTL / ImgH 2.25 ET5 / CT5 1.58 ΣCT / f 2.16 f6 / R12 -1.82 ΣCT / TTL 0.61

[0167] Fig. 8A The longitudinal spherical aberration of the wide-angle lens of Example 4 is shown, which indicates that light rays of different wavelengths deviate from the focal point behind the lens; Figure 8B 4 shows the astigmatism curve of the wide-angle lens of Example 4, which indicates the meridional image curvature and the sagittal image curvature; Figure 8C The distortion curve of the wide-angle lens of Example 4 is shown, which indicates the distortion magnitude value under different viewing angles. FIG. 8A to FIG. 8C It can be seen that the wide-angle lens provided in Example 4 can achieve good imaging quality.

[0168] Example 5

[0169] The following reference Figures 9 to 10C The wide-angle lens of Example 5 of the present application is described. Fig. 9 A schematic structural diagram of a wide-angle lens according to Embodiment 5 of the present application is shown.

[0170] like Fig. 9 As shown, the wide-angle lens includes, in order from the object side to the image side along the 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, a seventh lens L7 and an imaging surface S17.

[0171] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces, wherein the object-side surface S1 is concave at the optical axis and convex at the circumference, and the image-side surface S2 is convex at the optical axis and concave at the circumference.

[0172] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces, wherein the object-side surface S3 is convex at the optical axis and concave at the circumference, and the image-side surface S2 is convex at the optical axis and concave at the circumference.

[0173] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces, wherein the object-side surface S5 is convex at the optical axis and is convex at the circumference, and the image-side surface S6 is convex at the optical axis and is convex at the circumference.

[0174] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and is concave at the circumference, and the image-side surface S8 is convex at the optical axis and is convex at the circumference.

[0175] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both aspherical surfaces, wherein the object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0176] The sixth lens L6 has positive refractive power, and its object-side surface S11 and image-side surface S12 are both aspherical surfaces, wherein the object-side surface S11 is convex at the optical axis and concave at the circumference, and the image-side surface S12 is convex at the optical axis and convex at the circumference.

[0177] The seventh lens has negative refractive power, and its object-side surface S13 and image-side surface S14 are both aspherical surfaces, wherein the object-side surface S13 is convex at the optical axis and concave at the circumference, and the image-side surface S14 is concave at the optical axis and convex at the circumference.

[0178] Optionally, the wide-angle lens further includes a filter L8 having an object side surface S15 and an image side surface S16. Light from the object OBJ passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17. Optionally, a stop STO is provided between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

[0179] Table 12 shows the surface type, paraxial radius of curvature, thickness, material, refractive index, Abbe number and effective focal length of each lens of the wide-angle lens of Example 5, wherein the units of the radius of curvature, thickness and effective focal length of each lens are all in millimeters (mm); Table 13 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the aspherical surface type can be defined by the formula (1) given in Example 1; Table 14 shows the values ​​of the relevant parameters of the wide-angle lens given in Example 5, wherein half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens ImgH is 1.815mm. The reference wavelength is 555nm.

[0180] Table 12

[0181]

[0182] Table 13

[0183] Surface number K A4 A6 A8 A10 A12 A14 A16 A17 A18 S1 5.98E-02 2.07E+00 -5.84E+00 1.46E+01 -2.69E+01 3.51E+01 -3.13E+01 1.79E+01 -5.93E+00 8.64E-01 S2 -2.08E+03 2.27E+00 -6.07E+00 2.24E+01 -1.02E+02 4.15E+02 -1.13E+03 1.80E+03 -1.50E+03 5.11E+02 S3 -1.34E+01 -4.19E-02 -1.29E+00 7.88E+00 -3.27E+01 7.41E+01 -6.36E+01 0.00E+00 0.00E+00 0.00E+00 S4 1.10E+01 4.28E-01 3.01E+00 -2.85E+01 2.52E+02 -1.01E+03 1.98E+03 0.00E+00 0.00E+00 0.00E+00 S5 9.33E+00 4.44E-01 6.05E-01 -2.28E+00 4.72E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S7 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 5.27E-01 -2.72E+00 3.51E+01 -3.20E+02 2.00E+03 -8.41E+03 2.30E+04 -3.68E+04 2.64E+04 0.00E+00 S9 -7.99E+01 -3.25E+00 3.37E+01 -2.95E+02 1.79E+03 -7.35E+03 1.93E+04 -2.91E+04 1.91E+04 0.00E+00 S10 2.44E-02 -1.35E+00 5.52E+00 -2.08E+01 5.17E+01 -7.34E+01 5.13E+01 -1.17E+01 -1.82E+00 0.00E+00 S11 2.96E-01 -1.89E-01 -6.37E-01 7.23E+00 -3.75E+01 1.02E+02 -1.46E+02 1.04E+02 -2.90E+01 0.00E+00 S12 -1.27E+00 8.49E-01 -4.50E+00 1.56E+01 -3.99E+01 7.13E+01 -8.30E+01 5.54E+01 -1.56E+01 0.00E+00 S13 -3.19E+01 7.91E-02 -3.82E+00 1.15E+01 -1.95E+01 2.01E+01 -1.22E+01 4.08E+00 -5.88E-01 0.00E+00 S14 -3.64E+00 -5.13E-01 4.35E-01 -5.10E-02 -3.35E-01 3.71E-01 -1.88E-01 4.84E-02 -5.13E-03 0.00E+00

[0184] Table 14

[0185] f / f1 -0.49 ET7 / CT7 2.19 BFL(mm) 0.6 f / I 0.63 (R7+R8) / |R7-R8| 2.28 <![CDATA[tan(FOV) / TTL(mm -1 )]]> -0.35 <![CDATA[(R9+R10) / (R9*R10)(mm -1 )]]> 0.95 TTL / ImgH 2.15 ET5 / CT5 1.62 ΣCT / f 2.09 f6 / R12 -1.70 ΣCT / TTL 0.62

[0186] Fig. 10A The longitudinal spherical aberration of the wide-angle lens of Example 5 is shown, which indicates that light rays of different wavelengths deviate from the focal point behind the lens; Fig. 10B 4 shows the astigmatism curve of the wide-angle lens of Example 5, which indicates the meridional image curvature and the sagittal image curvature; Fig. 10C The distortion curve of the wide-angle lens of Example 5 is shown, which indicates the distortion magnitude value under different viewing angles. FIG. 10A to FIG. 10C It can be seen that the wide-angle lens provided in Example 5 can achieve good imaging quality.

[0187] Example 6

[0188] The following reference Figures 11 to 12C The wide-angle lens of Example 6 of the present application is described. Fig.11 A schematic structural diagram of a wide-angle lens according to Example 6 of the present application is shown.

[0189] like Fig.11 As shown, the wide-angle lens includes, in order from the object side to the image side along the 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, a seventh lens L7 and an imaging surface S17.

[0190] The first lens L1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces, wherein the object-side surface S1 is concave at the optical axis and is convex at the circumference, and the image-side surface S2 is concave at the optical axis and is concave at the circumference.

[0191] The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces, wherein the object-side surface S3 is convex at the optical axis and concave at the circumference, and the image-side surface S2 is concave at the optical axis and concave at the circumference.

[0192] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces, wherein the object-side surface S5 is convex at the optical axis and is convex at the circumference, and the image-side surface S6 is convex at the optical axis and is convex at the circumference.

[0193] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and is concave at the circumference, and the image-side surface S8 is convex at the optical axis and is convex at the circumference.

[0194] The fifth lens L5 has negative refractive power, and its object-side surface S9 and image-side surface S10 are both aspherical surfaces, wherein the object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0195] The sixth lens L6 has positive refractive power, and its object-side surface S11 and image-side surface S12 are both aspherical surfaces, wherein the object-side surface S11 is convex at the optical axis and concave at the circumference, and the image-side surface S12 is convex at the optical axis and convex at the circumference.

[0196] The seventh lens has negative refractive power, and its object-side surface S13 and image-side surface S14 are both aspherical surfaces, wherein the object-side surface S13 is convex at the optical axis and concave at the circumference, and the image-side surface S14 is concave at the optical axis and convex at the circumference.

[0197] Optionally, the wide-angle lens further includes a filter L8 having an object side surface S15 and an image side surface S16. Light from the object OBJ passes through the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17. Optionally, a stop STO is provided between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

[0198] Table 15 shows the surface type, paraxial radius of curvature, thickness, material, refractive index, Abbe number and effective focal length of each lens of the wide-angle lens of Example 6, wherein the units of the radius of curvature, thickness and effective focal length of each lens are all in millimeters (mm); Table 16 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 6, wherein the aspherical surface type can be defined by the formula (1) given in Example 1; Table 17 shows the values ​​of the relevant parameters of the wide-angle lens given in Example 6, wherein half the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface S17 of the wide-angle lens is 1.815 mm. The reference wavelength is 555 nm.

[0199] Table 15

[0200]

[0201] Table 16

[0202] Surface number K A4 A6 A8 A10 A12 A14 A16 A17 A18 S1 5.79E-02 2.08E+00 -5.87E+00 1.46E+01 -2.71E+01 3.54E+01 -3.16E+01 1.81E+01 -6.01E+00 8.76E-01 S2 -2.08E+03 2.28E+00 -6.04E+00 2.14E+01 -9.34E+01 3.73E+02 -1.02E+03 1.61E+03 -1.33E+03 4.47E+02 S3 9.04E+00 -5.15E-02 -1.03E+00 5.88E+00 -2.45E+01 5.68E+01 -4.92E+01 0.00E+00 0.00E+00 0.00E+00 S4 2.37E+03 4.21E-01 2.48E+00 -1.25E+01 7.76E+01 -1.81E+02 5.26E+02 0.00E+00 0.00E+00 0.00E+00 S5 9.48E+00 4.58E-01 5.77E-01 -4.50E+00 1.65E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S6 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S7 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S8 5.27E-01 -2.74E+00 3.60E+01 -3.35E+02 2.15E+03 -9.37E+03 2.64E+04 -4.36E+04 3.21E+04 0.00E+00 S9 -7.71E+01 -3.24E+00 3.37E+01 -2.98E+02 1.83E+03 -7.57E+03 1.99E+04 -3.01E+04 1.96E+04 0.00E+00 S10 3.12E-03 -1.36E+00 5.56E+00 -2.10E+01 5.27E+01 -7.65E+01 5.74E+01 -1.84E+01 1.28E+00 0.00E+00 S11 1.46E+00 -1.87E-01 -6.38E-01 7.31E+00 -3.81E+01 1.04E+02 -1.50E+02 1.08E+02 -3.06E+01 0.00E+00 S12 -1.27E+00 8.52E-01 -4.55E+00 1.59E+01 -4.07E+01 7.26E+01 -8.43E+01 5.60E+01 -1.57E+01 0.00E+00 S13 -3.14E+01 7.30E-02 -3.74E+00 1.11E+01 -1.85E+01 1.86E+01 -1.10E+01 3.51E+00 -4.80E-01 0.00E+00 S14 -3.64E+00 -5.15E-01 4.32E-01 -3.68E-02 -3.60E-01 3.93E-01 -1.99E-01 5.14E-02 -5.46E-03 0.00E+00

[0203] Table 17

[0204] f / f1 -0.47 ET7 / CT7 2.07 BFL(mm) 0.6 f / I 0.61 (R7+R8) / |R7-R8| 2.55 <![CDATA[tan(FOV) / TTL(mm -1 )]]> -0.31 <![CDATA[(R9+R10) / (R9*R10)(mm -1 )]]> 0.94 TTL / ImgH 2.18 ET5 / CT5 1.58 ΣCT / f 2.18 f6 / R12 -1.70 ΣCT / TTL 0.61

[0205] Fig. 12A The longitudinal spherical aberration of the wide-angle lens of Example 6 is shown, which indicates that light rays of different wavelengths deviate from the focal point behind the lens; Fig. 12B 4 shows the astigmatism curve of the wide-angle lens of Example 6, which indicates the meridional image curvature and the sagittal image curvature; Fig. 12C The distortion curve of the wide-angle lens of Example 6 is shown, which indicates the distortion magnitude value under different viewing angles. FIG. 12A to FIG. 12C It can be seen that the wide-angle lens provided in Example 6 can achieve good imaging quality.

[0206] The present application also provides an image pickup device, comprising the wide-angle lens as described above and a photosensitive element, wherein the photosensitive element is arranged on the imaging surface of the wide-angle lens to receive light of an image formed by the wide-angle lens.

[0207] Specifically, the photosensitive element may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor.

[0208] The above-mentioned image pickup device, using a wide-angle lens with a large field of view, can obtain image information of large scenes, and can be adapted to devices with limited size such as portable electronic devices.

[0209] The present application also provides an electronic device, comprising a housing and the image pickup device as described above, wherein the image pickup device is mounted on the housing to acquire images.

[0210] Specifically, the image pickup device is arranged in the shell and exposed from the shell to obtain images. The shell can provide the image pickup device with dustproof, waterproof and drop-proof protection. A hole corresponding to the image pickup device is opened on the shell to allow light to pass into or out of the shell from the hole.

[0211] The electronic device can capture large-scale images with a deep depth of field by using the image pickup device described above, thereby meeting people's professional photography needs. It should be noted that the electronic device of the embodiment of the present application includes but is not limited to mobile phones, car cameras, personal digital assistants, game consoles, personal computers, cameras, smart watches and other information terminal devices or home appliances with camera functions.

[0212] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0213] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A wide-angle lens, comprising seven lenses with refractive power, which are arranged in order from the object side to the image side along the optical axis: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are characterized in that: The first lens has negative refractive power, and its object side surface is concave at the optical axis; The second lens has positive refractive power; The third lens has refractive power; The fourth lens has positive refractive power; The fifth lens has negative refractive power, and its object side surface is convex at the optical axis; The sixth lens has positive refractive power, and its image side surface is convex at the optical axis; The seventh lens element has negative refractive power, and its object side surface is convex at the optical axis, and its image side surface is concave at the optical axis; The field of view FOV of the wide-angle lens satisfies 128.7583°≥FOV>125°; The wide-angle lens also satisfies the following relationship: 0.6<ΣCT / TTL<0.65; Wherein, ΣCT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, and TTL is the distance from the object side surface of the first lens to the imaging surface of the wide-angle lens on the optical axis.

2. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: 0.6 <f / ImgH<1; Wherein, f is the total effective focal length of the wide-angle lens, and ImgH is half of the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface of the wide-angle lens.

3. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: tan(FOV) / TTL>-0.4; Wherein, tan(FOV) is the tangent value of the field of view of the wide-angle lens, and TTL is the distance from the object side of the first lens to the imaging surface of the wide-angle lens on the optical axis.

4. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: -2 <f6 / R12<-1.4; Wherein, f6 is the effective focal length of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

5. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: 0.5mm <BFL<0.65mm; Wherein, BFL is the shortest distance from the image side of the seventh lens to the imaging surface of the wide-angle lens in a direction parallel to the optical axis.

6. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: TTL / ImgH≤2.26; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the wide-angle lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface of the wide-angle lens.

7. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: f / f1<-0.4; Wherein, f is the total effective focal length of the wide-angle lens, and f1 is the effective focal length of the first lens.

8. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: 0.8<(R9+R10) / (R9*R10)<1.5; Among them, R9 is the curvature radius of the object side of the fifth lens, and R10 is the curvature radius of the image side of the fifth lens.

9. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: 0.3<(R7+R8) / |R7-R8|<3; Among them, R7 is the curvature radius of the object side of the fourth lens, and R8 is the curvature radius of the image side of the fourth lens.

10. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: 2<ΣCT / f<2.5; Wherein, ΣCT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, and f is the total effective focal length f of the wide-angle lens.

11. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: 1.4 <ET5 / CT5<1.7; Wherein, ET5 is the thickness of the fifth lens at the maximum effective radius, and CT5 is the center thickness of the fifth lens on the optical axis.

12. The wide-angle lens according to claim 1, characterized in that: The wide-angle lens satisfies the following relationship: 1 <ET7 / CT7<2.5; Wherein, ET7 is the thickness of the seventh lens at the maximum effective radius, and CT7 is the center thickness of the seventh lens on the optical axis.

13. An image pickup device, characterized in that: include: The wide-angle lens as claimed in any one of claims 1 to 12; as well as, A photosensitive element is disposed on the image side of the wide-angle lens to receive light of an image formed by the wide-angle lens.

14. An electronic device, characterized in that: include: case; as well as, The image pickup device according to claim 13, wherein the image pickup device is mounted on the housing to acquire an image.

Images