CN112147750A - Wide-angle lens, image pickup apparatus, and electronic apparatus - Google Patents

Abstract

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

Description

Wide-angle lens, image pickup device, and electronic device

technical field

The present invention relates to the technical field of optical imaging, in particular to a wide-angle lens, an image pickup device and an electronic device.

Background technique

In recent years, with the rapid update and iteration of products such as computers, drones, smartphones, tablet computers, machine vision systems, and in-vehicle systems, optical lenses with various performance characteristics have also been continuously improved in related fields. The shooting effect of optical lenses has become the focus of people's expectations for scientific and technological progress, especially with the popularization of smartphones in daily life, in addition to requiring optical lenses to have a light, thin and short shape, high pixels, high resolution and other characteristics, optical lenses are also required to have Wider field of view to capture a larger area of the scene.

However, the inventor found that the field of view of the traditional wide-angle optical lens is still small, and it is difficult to meet people's requirements for shooting large scenes such as buildings, landscapes, mountains and rivers.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide an improved wide-angle lens for the problem of a small field of view of the traditional wide-angle optical lens.

A 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 sequence from the object side to the image side along the optical axis. Wherein, the first lens has a negative refractive power, and its object side 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 is convex at the optical axis; the sixth lens has a positive refractive power, and its image side is convex at the optical axis; the seventh lens has Negative refractive power, and its object side is convex at the optical axis, and its image side is concave at the optical axis. The FOV of the wide-angle lens satisfies FOV>125°.

In the above wide-angle lens, by rationally distributing the refractive power and surface shape of each lens, the wide-angle lens has the imaging effect of large wide angle, deep depth of field and miniaturized structural characteristics.

In one embodiment, 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 the effective pixel area pair of the photosensitive element on the imaging surface of the wide-angle lens half the length of the corner.

If the ratio is too large, the wide-angle imaging effect of the wide-angle lens cannot be achieved. If the ratio is too small, the depth of field will be shallow, which will affect the picture effect. When the above relationship is satisfied, it can not only meet the wide-angle shooting requirements, but also ensure that the wide-angle lens has a longer The range of depth of field can be used to capture clear images in both near and far distances.

In one embodiment, the wide-angle lens satisfies the following relationship: tan(FOV)/TTL>-0.4; wherein, tan(FOV) is the tangent of the field of view of the wide-angle lens, and TTL is the first lens The distance from the object side to the imaging plane of the wide-angle lens on the optical axis.

When the above relationship is satisfied, the total length of the wide-angle lens on the optical axis can be reduced while expanding the field of view of the wide-angle lens, which is beneficial to miniaturization of the wide-angle lens.

In one of the embodiments, 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 curvature radius of the image side surface of the sixth lens .

If the absolute value of the ratio is too large, it is not conducive to reducing the total length of the wide-angle lens, and if it is too small, it cannot ensure that the sixth lens provides a positive refractive power; satisfying the above relationship can ensure that the sixth lens has a positive refractive power , so as to reduce the total length of the wide-angle lens on the optical axis and further ensure the miniaturization of the wide-angle lens.

In one of the embodiments, the wide-angle lens satisfies the following relationship: 0.5mm<BFL<0.65mm; wherein, BFL is the shortest 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 distance.

If the distance is too large, it is not conducive to the miniaturization of the wide-angle lens, and if it is too small, the focal depth of the wide-angle lens will be small; when the above relationship is satisfied, the wide-angle lens can be guaranteed to have a large focal depth, so that the system It has a sufficient focusing range to obtain more information of the subject, and at the same time, the module assembly yield of the wide-angle lens can be improved.

In one embodiment, the wide-angle lens satisfies the following relationship: TTL/ImgH<3; wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the wide-angle lens, and ImgH is the 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, the total size of the wide-angle lens can be effectively compressed, and the miniaturization of the wide-angle lens can be realized, so that the wide-angle lens can be better applied to portable electronic devices such as Equivalently constrained devices.

In one of the embodiments, 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.

The first lens provides negative refractive power so that the wide-angle lens has a larger field of view, and when the above relationship is satisfied, the total effective focal length of the wide-angle lens can be prevented from being too long, thereby facilitating distortion correction and ensuring image quality. and processability.

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

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.

If the ratio is too large, the manufacturability of the wide-angle lens will be poor, and if the ratio is too small, it will not be conducive to correcting aberrations; by adjusting the curvature radius of the object side of the fifth lens and the curvature radius of the image side of the fifth lens to satisfy the above relationship, The contribution of the astigmatism of the object side surface and the image side surface of the fifth lens can be effectively controlled, thereby effectively improving the aberration of the wide-angle lens, and at the same time ensuring the machinability of the shape of the fifth lens.

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

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.

If the absolute value of the ratio is too large, the craftsmanship of the wide-angle lens will be poor, and if it is too small, the imaging quality of the wide-angle lens will be affected; by controlling the curvature radius of the object side of the fourth lens and the image side of the fourth lens The ratio of the radius of curvature can appropriately increase the incident angle of light to meet the image height requirements of the wide-angle lens, while reducing the assembly sensitivity of the wide-angle lens, ensuring the assembly stability of the wide-angle lens.

In one of the embodiments, 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, 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 the ratio is too small, the craftsmanship of the wide-angle lens is poor; by controlling the ratio of the total center thickness of each lens to the wide-angle lens to satisfy the above relationship, the tolerance sensitivity of the lens group can be reduced , so that the lens group has a compact structure combination to ensure the good processing technology of the wide-angle lens.

In one of the embodiments, 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, respectively, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the wide-angle lens.

If the ratio is too large, it is difficult to make the lens thinner, and if the ratio is too small, it is not conducive to distortion correction; by controlling the total center thickness of each lens and the optical total length of the wide-angle lens to satisfy the above relationship, the distortion can be effectively controlled within a reasonable range , to ensure the imaging quality, and at the same time, the overall size of the wide-angle lens can be effectively shortened, and the miniaturization of the wide-angle lens can be realized.

In one embodiment, the wide-angle lens satisfies the following relationship: 1.4<ET5/CT5<1.7; wherein, ET5 is the thickness at the maximum effective radius of the fifth lens, and CT5 is the fifth lens on the optical axis the center thickness.

If the ratio is too large, the manufacturability of the wide-angle lens will be poor, and if it is too small, the image quality of the wide-angle lens will be affected; by controlling the ratio of the edge thickness of the fifth lens to the center thickness of the fifth lens, the above-mentioned Therefore, the image quality can be guaranteed, and the assembly sensitivity of the wide-angle lens can be reduced at the same time.

In one of the embodiments, the wide-angle lens satisfies the following relationship: 1<ET7/CT7<2.5; wherein, ET7 is the thickness at the maximum effective radius of the seventh lens, and CT7 is the seventh lens on the optical axis the center thickness.

If the ratio is too large, the manufacturability of the wide-angle lens will be poor, and if the ratio is too small, it will be unfavorable for the correction of the aberration and optical performance of the wide-angle lens; the seventh lens is used to finally correct the aberration 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, the molding yield of the wide-angle lens is ensured, and the assembly stability of the wide-angle lens is improved.

The present application also provides an image pickup device.

An image pickup device includes the wide-angle lens as described above; and a photosensitive element provided on an image side of the wide-angle lens to receive light of an image formed by the wide-angle lens.

The above image pickup device can acquire image information of a large scene by using a wide-angle lens with a larger field of view, and can be adapted to devices with limited size such as portable electronic devices.

The present application also provides an electronic device, including a casing; and the image pickup device as described above, the image pickup device being mounted on the casing to acquire an image.

The above-mentioned electronic device can obtain images with a large scene and a deep depth of field by using the above-mentioned image pickup device, so as to meet people's professional photography needs.

Description of drawings

FIG. 1 shows a schematic structural diagram of the wide-angle lens of Embodiment 1 of the present application;

2A to 2C respectively show longitudinal spherical aberration curves, astigmatism curves and distortion curves of the wide-angle lens of Embodiment 1;

FIG. 3 shows a schematic structural diagram of the wide-angle lens of Embodiment 2 of the present application;

4A to 4C respectively show longitudinal spherical aberration curves, astigmatism curves and distortion curves of the wide-angle lens of Embodiment 2;

FIG. 5 shows a schematic structural diagram of the wide-angle lens of Embodiment 3 of the present application;

6A to 6C respectively show longitudinal spherical aberration curves, astigmatism curves and distortion curves of the wide-angle lens of Embodiment 3;

FIG. 7 shows a schematic structural diagram of the wide-angle lens of Embodiment 4 of the present application;

8A to 8C respectively show longitudinal spherical aberration curves, astigmatism curves and distortion curves of the wide-angle lens of Embodiment 4;

FIG. 9 shows a schematic structural diagram of the wide-angle lens of Embodiment 5 of the present application;

10A to 10C respectively show longitudinal spherical aberration curves, astigmatism curves and distortion curves of the wide-angle lens of Embodiment 5;

11 shows a schematic structural diagram of the wide-angle lens of Embodiment 6 of the present application;

12A to 12C respectively show longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the wide-angle lens of Example 6. FIG.

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the related drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "front", "rear", "circumferential" and similar expressions are The orientation or positional relationship shown in the figures is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. Invention limitations.

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 imply any limitation on the feature. Accordingly, the first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application. Meanwhile, 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.

In the drawings, the spherical or aspherical shapes shown in the drawings are shown by way of example for convenience of explanation. 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 drawings are examples only and are not drawn strictly to scale.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

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

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.

The first lens has a negative refractive power, and its object side is concave at the optical axis, which is used to increase the field of view of the wide-angle lens; the second lens has a positive refractive power, which is used to cooperate with the first lens to correct the astigmatism of the wide-angle lens; The third lens has positive or negative refractive power, which can be used with other lenses to fine-tune the optical performance of the wide-angle lens, avoid the lens in the wide-angle lens being too thin or too thick, and improve the assembly stability of the system; the fourth lens has a positive refractive power, which can be used with It cooperates with the fifth lens to correct system chromatic aberration; the fifth lens has negative refractive power, and its object side is convex at the optical axis, which is used to cooperate with the fourth lens to correct system chromatic aberration; the sixth lens has positive refractive power, which The image side is convex at the optical axis to shorten the overall length of the wide-angle lens; the seventh lens has a negative refractive power, its object side is convex at the optical axis, and its image side is concave at the optical axis, which is used for wide-angle lenses. The difference and the optical performance are finally corrected.

The FOV of the above-mentioned 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, and the sixth lens in sequence , the seventh lens, and finally converge on the imaging surface. Such a configuration can realize the wide-angle characteristic of the wide-angle lens, so as to fully obtain the information of the large scene scene and meet the visual field requirements of the portable electronic device.

In an exemplary 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. 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, thereby facilitating the distortion correction of the wide-angle lens and ensuring image quality and processability.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.3<(R7+R8)/|R7-R8|<3; wherein, R7 is the curvature radius of the object side of the fourth lens, and R8 is the image side of the fourth lens. Radius of curvature. If the absolute value of the ratio is too large, the craftsmanship of the wide-angle lens will be poor, and if it is too small, the imaging quality of the wide-angle lens will be affected; by controlling the ratio of the curvature radius of the object side of the fourth lens to the curvature radius of the image side of the fourth lens, it is possible to properly The incident angle of the light is increased to meet the image height requirements of the wide-angle lens, and the assembly sensitivity can be reduced to ensure the assembly stability of the wide-angle lens.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 0.8<(R9+R10)/(R9*R10)<1.5; wherein, R9 is the curvature radius of the object side of the fifth lens, and R10 is the image side of the fifth lens. Radius of curvature. If the ratio is too large, the craftsmanship of the wide-angle lens will be poor, and if it is too small, it will not be conducive to correcting aberrations. By adjusting the curvature radius of the object side of the fifth lens and the curvature radius of the image side of the fifth lens to satisfy the above relationship, the fifth lens can be effectively controlled. The contribution of the astigmatism of the object side and the image side is effectively improved, and the aberration of the wide-angle lens is effectively improved, while the machinability of the shape of the fifth lens is guaranteed.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 1.4<ET5/CT5<1.7; wherein ET5 is the thickness at the maximum effective radius of the fifth lens, and CT5 is the center thickness of the fifth lens on the optical axis. If the ratio is too large, the craftsmanship of the wide-angle lens will be poor, and if it is too small, the image quality of the wide-angle lens will be affected; by controlling the ratio of the edge thickness of the fifth lens to the center thickness of the fifth lens within a reasonable range, the image quality can be guaranteed. , while reducing the assembly sensitivity of the wide-angle lens.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: -2<f6/R12<-1.4; where f6 is the effective focal length of the sixth lens, and R12 is the curvature radius of the image side surface of the sixth lens. If the absolute value of the ratio is too large, it is not conducive to reducing the total length of the wide-angle lens, and if it is too small, the sixth lens cannot provide positive refractive power; Within a reasonable range, it can be ensured that the sixth lens element has a positive refractive power, thereby helping to reduce the total length of the wide-angle lens on the optical axis, and further ensuring the miniaturization of the wide-angle lens.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: 1<ET7/CT7<2.5; wherein, ET7 is the thickness at the maximum effective radius of the seventh lens, and CT7 is the center thickness of the seventh lens on the optical axis. If the ratio is too large, the craftsmanship of the wide-angle lens will be poor, and if the ratio is too small, it will not be conducive to the correction of the wide-angle lens aberration and optical performance; by controlling the ratio of the edge thickness of the seventh lens to the center thickness of the seventh lens within a reasonable range to ensure The wide-angle lens has good optical performance and molding yield, and at the same time improves the assembly stability of the wide-angle lens.

In an exemplary embodiment, 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 plane of the wide-angle lens in a direction parallel to the optical axis. If the distance is too large, it is not conducive to the miniaturization of the wide-angle lens, and if it is too small, the focal depth of the wide-angle lens will be small; It can ensure that the wide-angle lens has a larger focal depth, so that the lens has a sufficient focusing range to obtain more information on the subject, and at the same time, it can also improve the module assembly yield of the wide-angle lens.

In an exemplary 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 the diagonal length of the effective pixel area of the photosensitive element on the imaging surface of the wide-angle lens. If the ratio is too large, the wide-angle imaging effect of the wide-angle lens cannot be achieved. If the ratio is too small, the depth of field will be shallower, which will affect 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 have a longer depth of field. It can capture clear images in both near and far distances, meeting the professional shooting needs of wide-angle lenses.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: tan(FOV)/TTL>-0.4; where tan(FOV) is the tangent 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 wide-angle lens The distance of the imaging plane on the optical axis. When the above relationship is satisfied, the total length of the wide-angle lens on the optical axis can be reduced while expanding the field of view of the wide-angle lens, which is beneficial to miniaturization of the wide-angle lens.

In an exemplary embodiment, the wide-angle lens satisfies the following relationship: TTL/ImgH<3; wherein, 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, and ImgH is the photosensitive element on the imaging surface of the wide-angle lens Half the diagonal length of the effective pixel area. 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 realized, so that the wide-angle lens can be better suitable for size-constrained devices such as portable electronic devices. device.

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 respectively, 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 the ratio is too small, the craftsmanship 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 structure combination to ensure a good processing technology of the wide-angle lens.

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 respectively, and TTL is the object of the first lens The distance from the side to the imaging plane of the wide-angle lens on the optical axis. If the ratio is too large, it is difficult to make the lens thinner, and if the ratio is too small, it is not conducive to distortion correction; by controlling the total center thickness of each lens and the optical total length of the wide-angle lens to satisfy the above relationship, the system distortion can be effectively controlled within a reasonable range. Thereby, the image quality can be guaranteed, and the overall size of the wide-angle lens can be effectively shortened, and the miniaturization of the wide-angle lens can be realized.

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

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

The wide-angle lens according to the above-mentioned embodiments of the present application may employ multiple lenses, for example, the above-mentioned seven lenses. A wide-angle lens with a field of view greater than 125° and an FNO of about 2.28 is proposed by rationally distributing the refractive power and surface shape of each lens, the center thickness of each lens, and the on-axis distance between each lens. The wide-angle lens not only has the characteristics of high pixels, deep depth of field, miniaturization, etc., but also has the advantage of large wide-angle, which can meet the professional shooting needs of large scenes such as buildings, landscapes, mountains and rivers. It can be understood that, although seven lenses are used as an example for description in the embodiments, the wide-angle lens is not limited to include seven lenses, and the optical imaging lens may also include other numbers of lenses if necessary.

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 astigmatic aberration. After the aspherical lens is used, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

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

Example 1

The wide-angle lens of Embodiment 1 of the present application will be described below with reference to FIGS. 1 to 2C .

FIG. 1 shows a schematic structural diagram of the wide-angle lens of the first embodiment. As shown in FIG. 1 , the wide-angle lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, Seventh lens L7 and imaging surface S17.

The first lens L1 has a negative refractive power, and the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is concave at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The second lens L2 has a positive refractive power, the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The third lens L3 has a positive refractive power, the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is convex at the optical axis, and is convex at the circumference, and the image side S6 is convex at the optical axis. The circumference is convex.

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

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

The sixth lens L6 has a positive refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is convex at the optical axis, and is convex at the circumference, and the image side S12 is convex at the optical axis. The circumference is convex.

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

Optionally, the wide-angle lens further includes a filter L8 having an object side S15 and an image side S16. The light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17. Optionally, a diaphragm STO is arranged between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

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 radius of curvature, thickness, effective focal length of each lens The units of focal length are all millimeters (mm). The reference wavelength is 555nm.

Table 1

In this embodiment, each lens can be an aspherical lens, and each aspherical surface type x is defined by the following formula:

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is Table 1 The reciprocal of the radius of curvature R); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below shows the higher order coefficients A4, A6, A8, A10, A12, A14, A15, A17 and A18 that can be used for each of the aspheric mirror surfaces S1-S12 in Example 1.

Table 2

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

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;

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

(R9+R10)/(R9*R10)=1.21, the unit is mm ^-1 , where R9 is the paraxial radius of curvature of the object side S9 of the fifth lens, and R10 is the paraxial radius of curvature of the image side S10 of the fifth lens L5 ;

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;

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

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;

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

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;

tan(FOV)/TTL=-0.37, the unit is mm ^-1 , where tan(FOV) is the tangent of the field of view of the wide-angle lens, and TTL is the center of the object side S1 of the first lens L1 to the imaging plane S17 of the wide-angle lens the distance on the optical axis,

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

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 respectively, and f is the total effective focal length of the wide-angle lens;

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

FIG. 2A shows the longitudinal spherical aberration of the wide-angle lens of Example 1, and the curves in the figure represent the deviation of the confocal point of light with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.588 μm and 0.656 μm after passing through the lens; FIG. 2B shows The astigmatism curve of the wide-angle lens of Example 1 is shown, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane; FIG. 2C shows the distortion curve of the wide-angle lens of Example 1, which represents the magnitude of distortion under different viewing angles. It can be seen from FIGS. 2A to 2C that the wide-angle lens provided in Embodiment 1 can achieve good imaging quality.

Example 2

The wide-angle lens of Embodiment 2 of the present application will be described below with reference to FIGS. 3 to 4C . In this embodiment and the following embodiments, descriptions similar to those in Embodiment 1 will be omitted for the sake of brevity. FIG. 3 shows a schematic structural diagram of a wide-angle lens according to Embodiment 2 of the present application.

As shown in FIG. 3, the wide-angle lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, Seventh lens L7 and imaging surface S17.

The first lens L1 has a negative refractive power, and the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is concave at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The second lens L2 has a positive refractive power, the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The third lens L3 has a positive refractive power, the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is convex at the optical axis, and is convex at the circumference, and the image side S6 is concave at the optical axis. The circumference is concave.

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

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

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

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

Optionally, the wide-angle lens further includes a filter L8 having an object side S15 and an image side S16. The light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17. Optionally, a diaphragm STO is arranged between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

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 radius of curvature, thickness, and effective focal length of each lens The units of are all millimeters (mm); Table 4 shows the high-order term coefficients that can be used for each aspherical mirror surface in Example 2, and the aspherical surface type can be limited by the formula (1) given in Example 1; Table 4 5 shows the numerical values of the relevant parameters of the wide-angle lens given in Example 2, wherein the half of the diagonal length of the effective pixel area of the photosensitive element on the imaging plane S17 of the wide-angle lens, ImgH, is 1.815mm. The reference wavelength is 555nm.

table 3

Table 4

face 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

table 5

f/f1 -0.69 ET7/CT7 2.05 BFL(mm) 0.6 f/ImgH 0.63 (R7+R8)/|R7-R8| 0.8 tan(FOV)/TTL(mm^-1) -0.36 (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

FIG. 4A shows the longitudinal spherical aberration of the wide-angle lens of Example 2, which represents the deviation of the confocal point of light of different wavelengths after passing through the lens; FIG. 4B shows the astigmatism curve of the wide-angle lens of Example 2, which represents the curvature of the meridional image plane and sagittal image plane curvature; FIG. 4C shows the distortion curve of the wide-angle lens of Example 2, which represents the magnitude of the distortion value under different viewing angles. It can be seen from FIGS. 4A to 4C that the wide-angle lens provided in Embodiment 2 can achieve good imaging quality.

Example 3

The wide-angle lens of Embodiment 3 of the present application will be described below with reference to FIGS. 5 to 6C . FIG. 3 shows a schematic structural diagram of a wide-angle lens according to Embodiment 3 of the present application.

As shown in FIG. 5, the wide-angle lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, Seventh lens L7 and imaging surface S17.

The first lens L1 has a negative refractive power, and the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is concave at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The second lens L2 has a positive refractive power, the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the optical axis, and is concave at the circumference, and the image side S2 is convex at the optical axis. The circumference is convex.

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

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

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

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

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

Optionally, the wide-angle lens further includes a filter L8 having an object side S15 and an image side S16. The light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17. Optionally, a diaphragm STO is arranged between the third lens L3 and the fourth lens L4 to further improve the imaging quality of the wide-angle lens.

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 radius of curvature, thickness, and effective focal length of each lens The units are all millimeters (mm); Table 7 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 3, and the aspherical surface type can be limited by the formula (1) given in Example 1; Table 8 shows the numerical values of the relevant parameters of the wide-angle lens given in Example 3, where ImgH, half of the diagonal length of the effective pixel area of the photosensitive element on the imaging plane S17 of the wide-angle lens, is 1.815 mm. The reference wavelength is 555nm.

Table 6

Table 7

face 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

Table 8

f/f1 -0.67 ET7/CT7 2.24 BFL(mm) 0.52 f/ImgH 0.62 (R7+R8)/|R7-R8| 0.4 tan(FOV)/TTL(mm^-1) -0.34 (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

FIG. 6A shows the longitudinal spherical aberration of the wide-angle lens of Embodiment 3, which represents the deviation of the confocal point of light of different wavelengths after passing through the lens; FIG. 6B shows the astigmatism curve of the wide-angle lens of Embodiment 3, which represents the curvature of the meridional image plane and sagittal image plane curvature; FIG. 6C shows the distortion curve of the wide-angle lens of Example 3, which represents the magnitude of the distortion value under different viewing angles. According to FIGS. 6A to 6C , it can be seen that the wide-angle lens provided in Embodiment 3 can achieve good imaging quality.

Example 4

The wide-angle lens of Embodiment 4 of the present application will be described below with reference to FIGS. 7 to 8C . FIG. 7 shows a schematic structural diagram of a wide-angle lens according to Embodiment 4 of the present application.

As shown in FIG. 7 , the wide-angle lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, Seventh lens L7 and imaging surface S17.

The first lens L1 has a negative refractive power, and the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is concave at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The second lens L2 has a positive refractive power, the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The third lens L3 has a negative refractive power, the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is concave at the optical axis and convex at the circumference, and the image side S6 is concave at the optical axis. The circumference is concave.

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

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

The sixth lens L6 has a positive refractive power, and the object side S11 and the image side S12 are both aspherical, wherein the object side S11 is concave at the optical axis, and is convex at the circumference, and the image side S12 is convex at the optical axis. The circumference is convex.

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

Optionally, the wide-angle lens further includes a filter L8 having an object side S15 and an image side S16. The light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging plane S17. Optionally, a diaphragm STO is arranged between the third lens L3 and the fourth lens L4 to further improve the imaging quality of the wide-angle lens.

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

Table 9

Table 10

face 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

Table 11

f/f1 -0.68 ET7/CT7 2.22 BFL(mm) 0.55 f/ImgH 0.63 (R7+R8)/|R7-R8| 0.35 tan(FOV)/TTL(mm^-1) -0.33 (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

FIG. 8A shows the longitudinal spherical aberration of the wide-angle lens of Embodiment 4, which represents the deviation of the confocal point of light of different wavelengths after passing through the lens; FIG. 8B shows the astigmatism curve of the wide-angle lens of Embodiment 4, which represents the curvature of the meridional image plane and sagittal image plane curvature; FIG. 8C shows the distortion curve of the wide-angle lens of Example 4, which represents the magnitude of the distortion value under different viewing angles. According to FIGS. 8A to 8C , it can be seen that the wide-angle lens provided in Embodiment 4 can achieve good imaging quality.

Example 5

The wide-angle lens of Embodiment 5 of the present application will be described below with reference to FIGS. 9 to 10C . FIG. 9 shows a schematic structural diagram of a wide-angle lens according to Embodiment 5 of the present application.

As shown in FIG. 9 , the wide-angle lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, Seventh lens L7 and imaging surface S17.

The first lens L1 has a negative refractive power, the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is concave at the optical axis, and is convex at the circumference, and the image side S2 is convex at the optical axis. The circumference is concave.

The second lens L2 has a positive refractive power, the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the optical axis, and is concave at the circumference, and the image side S2 is convex at the optical axis. The circumference is concave.

The third lens L3 has a positive refractive power, the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is convex at the optical axis, and is convex at the circumference, and the image side S6 is convex at the optical axis. The circumference is convex.

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

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

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

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

Optionally, the wide-angle lens further includes a filter L8 having an object side S15 and an image side S16. The light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17. Optionally, a diaphragm STO is arranged between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

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 radius of curvature, thickness, and effective focal length of each lens The units are all millimeters (mm); Table 13 shows the high-order coefficients that can be used for each aspherical mirror surface in Example 5, and the aspherical surface type can be defined by the formula (1) given in Example 1; Table 14 shows the numerical values of the relevant parameters of the wide-angle lens given in Example 5, wherein the half ImgH of the diagonal length 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 555nm.

Table 12

Table 13

face 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

Table 14

f/f1 -0.49 ET7/CT7 2.19 BFL(mm) 0.6 f/ImgH 0.63 (R7+R8)/|R7-R8| 2.28 tan(FOV)/TTL(mm^-1) -0.35 (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

FIG. 10A shows the longitudinal spherical aberration of the wide-angle lens of Example 5, which represents the deviation of the converging point of light of different wavelengths after passing through the lens; FIG. 10B shows the astigmatism curve of the wide-angle lens of Example 5, which represents the curvature of the meridional image plane and sagittal image plane curvature; FIG. 10C shows the distortion curve of the wide-angle lens of Example 5, which represents the magnitude of the distortion value under different viewing angles. According to FIGS. 10A to 10C , it can be seen that the wide-angle lens provided in Embodiment 5 can achieve good imaging quality.

Example 6

The wide-angle lens of Embodiment 6 of the present application will be described below with reference to FIGS. 11 to 12C . FIG. 11 shows a schematic structural diagram of a wide-angle lens according to Embodiment 6 of the present application.

As shown in FIG. 11 , the wide-angle lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, Seventh lens L7 and imaging surface S17.

The first lens L1 has a negative refractive power, and the object side S1 and the image side S2 are both aspherical, wherein the object side S1 is concave at the optical axis, and is convex at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The second lens L2 has a positive refractive power, the object side S3 and the image side S4 are both aspherical, wherein the object side S3 is convex at the optical axis, and concave at the circumference, and the image side S2 is concave at the optical axis. The circumference is concave.

The third lens L3 has a positive refractive power, the object side S5 and the image side S6 are both aspherical, wherein the object side S5 is convex at the optical axis, and is convex at the circumference, and the image side S6 is convex at the optical axis. The circumference is convex.

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

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

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

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

Optionally, the wide-angle lens further includes a filter L8 having an object side S15 and an image side S16. The light from the object OBJ sequentially passes through the respective surfaces S1 to S16 and is finally imaged on the imaging surface S17. Optionally, a diaphragm STO is arranged between the second lens L2 and the third lens L3 to further improve the imaging quality of the wide-angle lens.

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

Table 15

Table 16

face 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

Table 17

f/f1 -0.47 ET7/CT7 2.07 BFL(mm) 0.6 f/ImgH 0.61 (R7+R8)/|R7-R8| 2.55 tan(FOV)/TTL(mm^-1) -0.31 (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

Fig. 12A shows the longitudinal spherical aberration of the wide-angle lens of Example 6, which represents the deviation of the converging point of light of different wavelengths after passing through the lens; Fig. 12B shows the astigmatism curve of the wide-angle lens of Example 6, which represents the curvature of the meridional image plane and sagittal image plane curvature; FIG. 12C shows the distortion curve of the wide-angle lens of Example 6, which represents the magnitude of the distortion value under different viewing angles. It can be seen from FIGS. 12A to 12C that the wide-angle lens provided in Example 6 can achieve good imaging quality.

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 disposed on an imaging surface of the wide-angle lens to receive light from an image formed by the wide-angle lens.

Specifically, the photosensitive element may use a complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor) image sensor or a charge coupled element (CCD, Charge-coupled Device) image sensor.

The above-mentioned image pickup device can acquire image information of a large scene by using a wide-angle lens with a larger field of view, and can be adapted to a device with limited size such as a portable electronic device.

The present application also provides an electronic device, including a housing and the image pickup device as described above, where the image pickup device is mounted on the housing to acquire an image.

Specifically, the image pickup device is disposed in and exposed from the housing to acquire images, the housing can provide protection against dust, water and drop for the image pickup device, and holes corresponding to the image pickup device are opened on the housing to Pass light through the hole into or out of the case.

The above-mentioned electronic device can capture images with a large scene and a deep depth of field by using the above-mentioned image pickup device, so as to meet people's professional photography needs. It should be pointed out that the electronic devices of the embodiments of the present application include but are not limited to mobile phones, car lenses, personal digital assistants, game consoles, personal computers, cameras, smart watches and other information terminal devices or home appliances with camera functions.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which 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 appended claims.

Claims (15)

1. A wide-angle lens, comprising sequentially 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, wherein is, The first lens has negative refractive power, and the object side surface thereof is concave at the optical axis; the second lens has a positive refractive power; the third lens has refractive power; the fourth lens has positive refractive power; The fifth lens has negative refractive power, and the object side surface thereof 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 has a negative refractive power, and its object side is convex at the optical axis, and its image side is concave at the optical axis; The FOV of the wide-angle lens satisfies FOV>125°. 2. wide-angle lens according to claim 1, is characterized in that, described wide-angle lens satisfies following relational formula: 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, wherein 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 on the optical axis from the object side of the first lens to the imaging plane of the wide-angle lens. 4. The wide-angle lens according to claim 1, wherein 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 curvature radius of the image side surface of the sixth lens. 5. The wide-angle lens according to claim 1, wherein the wide-angle lens satisfies the following relationship: 0.5mm<BFL<0.65mm; Wherein, BFL is the shortest distance from the image side surface 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, wherein the wide-angle lens satisfies the following relationship: TTL/ImgH<3; Wherein, 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, and ImgH is half 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, wherein 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, wherein the wide-angle lens satisfies the following relationship: 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. 9. The wide-angle lens according to claim 1, wherein the wide-angle lens satisfies the following relationship: 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. 10. The wide-angle lens according to claim 1, wherein the wide-angle lens satisfies the following relationship: 2<ΣCT/f<2.5; Wherein, 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 f of the wide-angle lens. 11. The wide-angle lens according to claim 1, wherein 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 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. 12. The wide-angle lens according to claim 1, wherein the wide-angle lens satisfies the following relationship: 1.4<ET5/CT5<1.7; Wherein, ET5 is the thickness at the maximum effective radius of the fifth lens, and CT5 is the center thickness of the fifth lens on the optical axis. 13. The wide-angle lens according to claim 1, wherein the wide-angle lens satisfies the following relationship: 1<ET7/CT7<2.5; Wherein, 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. 14. An image pickup device, comprising: The wide-angle lens of any one of claims 1-13; and, A photosensitive element, the photosensitive element is arranged on the image side of the wide-angle lens to receive the light of the image formed by the wide-angle lens. 15. An electronic device, comprising: housing; and, 15. The image pickup apparatus according to claim 14, which is mounted on the casing to acquire an image.

Images