Wide-angle lens, shooting device and movable platform

Abstract

The embodiment of the utility model provides a wide-angle lens, a shooting device and a movable platform. The wide-angle lens comprises a first lens group with negative focal power, a reflection optical element and a second lens group with positive focal power which are sequentially arranged from an object side to an image side along an optical axis, the first lens group comprises at least two negative lenses, the second lens group comprises at least five lenses, and the wide-angle lens satisfies the following conditions: 14lt; tTL / flt; 17; 90 degree lt; omega; wherein TTL is the distance on the optical axis from the object side surface of the lens closest to the object side to the imaging surface when an infinite object is focused, f is the overall focal length of the wide-angle lens, and omega is the maximum angle of the incident light of the lens closest to the object side. According to the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced, the spherical aberration can be well corrected, the lens size miniaturization can be realized while a larger field angle is ensured, and the imaging quality can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photography and video recording technical field, especially a wide-angle lens, shooting device and movable platform. BACKGROUND

[0002] Wide-angle lens is commonly used for shooting macro environment and story background in photography and video recording due to its wide shooting angle.

[0003] In order to realize the miniaturization of product structure size as much as possible, the number of lenses used in common wide-angle lens is usually small, which cannot correct aberration sufficiently.

[0004] Therefore, although the structure size of wide-angle lens is reduced, when it is used with high-pixel sensor, it cannot present better high quality.

[0005] Therefore, the existing wide-angle lens cannot balance miniaturization design and excellent imaging quality. SUMMARY

[0006] Therefore, in order to solve the problem that the existing wide-angle lens cannot balance miniaturization design and excellent imaging quality, the utility model provides a wide-angle lens, shooting device and movable platform.

[0007] In the first aspect, the utility model embodiment provides a wide-angle lens, which comprises a first lens group with negative focal length, a reflective optical element and a second lens group with positive focal length arranged in sequence along the optical axis from the object side to the image side.

[0008] The first lens group comprises at least two negative lenses, the second lens group comprises at least five lenses, and the wide-angle lens satisfies the following conditions:

[0009] 14 < TTL / f < 17;

[0010] 90 ° < omega;

[0011] Wherein, TTL is the distance on the optical axis from the object side surface of the lens closest to the object side to the imaging surface when focusing on an infinite object, f is the overall focal length of the wide-angle lens, and omega is the maximum angle of the incident light of the lens closest to the object side.

[0012] In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element. In addition, the image side of the reflective element is composed of at least six lenses, which can well correct the spherical aberration caused by the shortening of the overall length. In addition, by controlling at least three optical structure parameters of TTL, f and omega, the wide-angle lens size can be miniaturized while ensuring a large field of view, and the imaging quality of the wide-angle lens can be improved.

[0013] In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element. In addition, the image side of the reflective element is composed of at least six lenses, which can well correct the spherical aberration caused by the shortening of the overall length. In addition, by controlling at least three optical structure parameters of TTL, f and omega, the wide-angle lens size can be miniaturized while ensuring a large field of view, and the imaging quality of the wide-angle lens can be improved.

[0014] In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element. In addition, the image side of the reflective element is composed of at least six lenses, which can well correct the spherical aberration caused by the shortening of the overall length. In addition, by controlling at least three optical structure parameters of TTL, f and omega, the wide-angle lens size can be miniaturized while ensuring a large field of view, and the imaging quality of the wide-angle lens can be improved.

[0015] Omega is greater than or equal to 100 degrees.

[0016] D is greater than or equal to 9.2mm.

[0017] Wherein, omega is the maximum angle of the incident light of the lens closest to the object side; d is the maximum effective projection circle diameter of the wide-angle lens on the image sensor.

[0018] In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element. In addition, the image side of the reflective element is composed of at least six lenses, which can well correct the spherical aberration caused by the shortening of the overall length. In addition, by controlling at least three optical structure parameters of TTL, f and omega, the wide-angle lens size can be miniaturized while ensuring a large field of view, and the imaging quality of the wide-angle lens can be improved.

[0019] In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element. In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element.

[0020] In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element. In the embodiment of the utility model, the occurrence risk of ghosting and glare can be reduced by configuring at least two lenses on the object side of the reflective optical element.

[0021] The shooting device and the movable platform of the embodiment of the utility model have at least the same advantages as the wide-angle lens, which will not be described here.

[0022] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the specific embodiments of the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0024] Figure 1 The optical structure diagram of the first wide-angle lens of the embodiment of the present application is shown;

[0025] Figure 2 The axial aberration diagram of the wide-angle lens of the embodiment of the present application is shown; Figure 1

[0026] Figure 3 The optical structure diagram of the second wide-angle lens of the embodiment of the present application is shown;

[0027] Figure 4 The axial aberration diagram of the wide-angle lens of the embodiment of the present application is shown; Figure 3

[0028] Figure 5 The optical structure diagram of the third wide-angle lens of the embodiment of the present application is shown;

[0029] Figure 6 The axial aberration diagram of the wide-angle lens of the embodiment of the present application is shown; Figure 5

[0030] Figure 7 The optical structure diagram of the fourth wide-angle lens of the embodiment of the present application is shown;

[0031] Figure 8 The axial aberration diagram of the wide-angle lens of the embodiment of the present application is shown; Figure 7

[0032] Figure 9 The optical structure diagram of the fifth wide-angle lens of the embodiment of the present application is shown;

[0033] Figure 10 The axial aberration diagram of the wide-angle lens of the embodiment of the present application is shown; Figure 9 ​​​​​

[0034] Figure 11 An optical structure diagram of a sixth wide-angle lens of the embodiment of the present application is shown;

[0035] Figure 12 An axial aberration diagram of the wide-angle lens of the embodiment of the present application is shown; Figure 11

[0036] Figure 13 A schematic diagram of a photographing device of the embodiment of the present application is shown;

[0037] Figure 14 An optical structure diagram of a panoramic imaging system of the embodiment of the present application is shown;

[0038] Figure 15 A schematic diagram of a UAV of the embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work under the premise that the embodiments in the present application are within the scope of protection of the present application.

[0040] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily mean the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0041] Referring to any of Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 and Figure 11 , an optical structure schematic diagram of a wide-angle lens 10 of the embodiment of the present application is shown. As Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 and Figure 11 ​As shown, the wide-angle lens 10 of the embodiment of the utility model includes the first lens group 10a with negative focal length, the reflective optical element 10b and the second lens group 10c with positive focal length arranged in order along the optical axis from the object side to the image side. In the process of light rays propagating from the object side to the image side, the light rays first pass through the first lens group 10a, the light rays emitted from the first lens group 10a form reflected light rays after being reflected by the reflective optical element 10b, and the reflected light rays are emitted after passing through the second lens group 10c on the image side and irradiate on the imaging sensor (for example, CMOS sensor). The setting of the reflective optical element 10b helps to reduce the lateral distance of the lens and improve the brightness at the periphery of the field of view. The first lens group 10a includes at least two negative lenses, the second lens group 10c includes at least five lenses, and the wide-angle lens satisfies the following conditions: 14 < TTL / f < 17, 90° < ω.

[0042] In the embodiment of the utility model, by configuring at least two lenses on the object side of the reflective optical element, the risk of ghosting and glare can be reduced. In addition, the image side of the reflective element is composed of at least six lenses, which can well correct the spherical aberration caused by the shortening of the total length. In addition, by controlling at least three optical structure parameters of TTL, f and ω, when a larger field of view is ensured, it is also helpful to realize the miniaturization of the wide-angle lens, and the imaging quality of the wide-angle lens can also be improved.

[0043] 14 < TTL / f < 17 is expression (1), TTL is the distance on the optical axis between the object side surface of the lens closest to the object side and the imaging surface when focusing on an infinite object, f is the overall focal length of the wide-angle lens. When TTL / f does not exceed 14, although it is easier to realize the miniaturization of the wide-angle lens, the spherical aberration and the field curvature and the on-axis chromatic aberration and the magnification chromatic aberration will be greatly increased, so it is difficult to realize good imaging performance in the wide-angle lens. When TTL / f is not less than 17, the optical imaging performance will be improved, but the size of the lens will also become larger, which is not conducive to the miniaturization of the product.

[0044] In addition, in some embodiments, in order to balance the smaller size of the wide-angle lens and better optical performance, TTL / f can further satisfy expression (1a): 14.8 < TTL / f < 16.5.

[0045] 90° < ω is expression (2), when ω is greater than 90°, the wide-angle lens can provide a wider shooting range. In addition, in some embodiments, in order to make the shooting range of the wide-angle lens wider, ω can further satisfy expression (2a): 95° < ω, or in some embodiments, expression (2a) can also be ω ≥ 100°.

[0046] It should be noted that the wide-angle lens of the embodiment of the present invention can be used alone, or at least two wide-angle lenses can be combined to form a panoramic lens for shooting a synthetic 360° panoramic picture. In this case, the shooting area of ​​a single wide-angle lens must be at least 180°.

[0047] Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 and Figure 11 The difference lies in the different structural parameters of each lens, resulting in different wide-angle lens design schemes. Figure 2 、 Figure 4 、 Figure 6 、 Figure 8 、 Figure 10 and Figure 12 They are Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 and Figure 11 The corresponding axial aberration diagrams for the wide-angle lens at infinity focus. Each axial aberration diagram shows, from left to right, spherical aberration SA (mm), astigmatism AST (mm), and distortion DIS (%). In the spherical aberration diagrams, the vertical axis represents the F-number (F in the diagrams), the solid line represents the d-line (d-line), the dotted line represents the F-line (F-line), and the dashed line represents the C-line (C-line) characteristics. In the astigmatism diagrams, the vertical axis represents the image height (H in the diagrams), the solid line represents the sagittal plane (s in the diagrams) of the d-line, and the dashed line represents the meridional plane (m in the diagrams). In the distortion diagrams, the vertical axis represents the image height (H in the diagrams).

[0048] Therefore, when designing the wide-angle lens of the embodiment of the present invention, by controlling the above-mentioned optical structural parameters, it is possible to achieve miniaturization of the wide-angle lens while ensuring a large field of view, and also to improve the imaging quality of the wide-angle lens.

[0049] The present invention also provides a wide-angle lens, comprising a first lens group having negative optical power, a reflective optical element, and a second lens group having positive optical power, arranged in sequence from the object side to the image side along the optical axis; the first lens group includes at least two negative lenses, and the second lens group includes a positive lens and a negative lens;

[0050] The wide-angle lens satisfies the following conditions: ω≥100°; d≥9.2mm;

[0051] Wherein, ω is the maximum angle of the incident light of the lens closest to the object side; d is the maximum effective projection circle diameter corresponding to the wide-angle lens on the image sensor.

[0052] In the embodiment of the utility model, a wide-angle lens is provided, at least two lenses are arranged on the object side of the reflective optical element, which can reduce the risk of ghosting and glare. In addition, the image side of the reflective element is composed of positive lenses and negative lenses, which can well correct the spherical aberration caused by the shortening of the overall length. In addition, ω≥100° can ensure a larger field of view; d≥9.2mm can adapt to a larger size image sensor and can improve the utilization rate of the image sensor.

[0053] It can be understood that the maximum effective projection circle diameter corresponding to the wide-angle lens on the image sensor can be adjusted by setting the diameter of each lens, the diameter of the diaphragm, setting the main light angle of the outgoing light, and the like.

[0054] The positive lens mentioned in the embodiment of the application refers to a lens with positive optical power; the negative lens refers to a lens with negative optical power.

[0055] Optionally, in some embodiments, the first lens group 10a includes a first lens 101 and a second lens 102, and the optical power of the first lens 101 and the second lens 102 is negative; and / or,

[0056] The second lens group 10c includes a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, and an eighth lens 108 arranged along the optical axis from the object side to the image side, and the optical power of the third lens 103, the fourth lens 104, the fifth lens 105, the sixth lens 106, the seventh lens 107, and the eighth lens 108 is positive, positive, negative, negative, positive, and negative, respectively.

[0057] Specifically, in the embodiment of the utility model, the first lens group 10a can include two lenses, specifically a first lens 101 and a second lens 102 with negative optical power. The first lens 101 and the second lens 102 are located on the object side of the reflective optical element 10b, which can reduce the risk of ghosting and glare. In addition, the second lens group 10c can include a total of six lenses, specifically a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, a seventh lens 107, and an eighth lens 108, and the optical power of the six lenses is positive, positive, negative, negative, positive, and negative, respectively, which is helpful to correct the spherical aberration. Therefore, compared with the common wide-angle lens composed of seven lenses, the wide-angle lens of the embodiment of the utility model can improve the optical performance by increasing one lens under the premise of meeting the foregoing expressions (1) and (2), and without significantly increasing the structure size of the lens.

[0058] Optionally, the second lens group 10c includes at least two cemented lenses.

[0059] Specifically, in the embodiment of the utility model, at least two cemented lenses are used in the second lens group 10c, which means that the focal length combination of different cemented lenses is different. By setting at least two cemented lenses, on-axis chromatic aberration and the magnification chromatic aberration that is prone to occur under ultra-wide angle can be well corrected, and the cemented lens can reduce TTL to a certain extent, so that the multiple lenses can have a smaller TTL / f.

[0060] Optionally, the two cemented lenses are arranged adjacently.

[0061] Specifically, in the embodiment of the utility model, when the second lens group 10c includes two cemented lenses, the two cemented lenses can be arranged adjacently without being separated by other lenses. This optical configuration can further improve the imaging quality of the wide-angle lens.

[0062] Optionally, the reflective optical element 10b and the two cemented lenses are arranged adjacently.

[0063] Specifically, in the embodiment of the utility model, according to the description of the foregoing embodiments, the second lens group 10c is located on the image side of the reflective optical element 10b, that is, on the reflection light propagation path of the reflective optical element 10b. At this time, the two cemented lenses are arranged adjacently, and one of them is also arranged adjacently with the reflective optical element 10b. Therefore, the two cemented lenses can correct the reflected light of the reflective optical element 10b, thereby improving the magnification chromatic aberration.

[0064] Optionally, according to any one of Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 and Figure 11 , the fourth lens 104 and the fifth lens 105 form a first cemented lens, and the sixth lens 106 and the seventh lens 107 form a second cemented lens.

[0065] Specifically, in one embodiment, as shown in any one of Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 and Figure 11 , in the embodiment of the utility model, the fourth lens 104 and the fifth lens 105 can be cemented to form a first cemented lens, and the focal length of the first cemented lens is positive and negative. The sixth lens 106 and the seventh lens 107 can be cemented to form a second cemented lens, and the focal length of the second cemented lens is negative and positive.

[0066] Optionally, in some embodiments, when the cemented lens comprises a first cemented lens and a second cemented lens, the wide-angle lens further comprises a first lens barrel and a second lens barrel, and the two cemented lenses are respectively connected with the two different lens barrels. For example, the first cemented lens is connected with the first lens barrel, the second cemented lens is connected with the second lens barrel, and the first lens barrel and the second lens barrel are connected together with a movable gap, and the thermal expansion coefficient of the first lens barrel is less than the thermal expansion coefficient of the second lens barrel.

[0067] When the wide-angle lens is deformed by heat, the thermal expansion coefficient of the first lens barrel is less than the thermal expansion coefficient of the second lens barrel, which helps to avoid excessive increase in the distance between the first cemented lens and the second cemented lens, and the distance between the two can basically remain unchanged, thereby maintaining the stability of the optical performance.

[0068] Optionally, in some embodiments, the first lens group 10a comprises at least one aspherical lens; and / or, the second lens group 10b comprises at least one aspherical lens. The aspherical lens is a lens whose radius of each point on the surface is determined by a high-order polynomial equation, and the radius of each point on the surface is not the same. The aspherical lens has higher aberration correction ability than the spherical lens, and one aspherical lens has the aberration correction ability of two to three spherical lenses. When at least one lens in the first lens group 10a and the second lens group 10b is an aspherical lens, the corresponding lens is lighter and thinner, which is more helpful to realize the miniaturization of the wide-angle lens, and the aspherical lens can also take into account excellent imaging quality.

[0069] Optionally, in some embodiments, the aspherical surface shape of the above-mentioned aspherical lens can be defined by the following formula:

[0070]

[0071] Wherein, Z represents the distance from the point on the aspherical surface with a height of h from the optical axis to the tangent plane of the vertex of the aspherical surface, h represents the height from the optical axis, r represents the vertex curvature radius, k represents the conic constant, An represents the n-th aspherical surface coefficient, and An can be A4, A6, A8 or A10.

[0072] For the specific parameters of the symbols in the above formula, the embodiments of the present application do not make any limitation, and the appropriate aspherical surface shape parameters can be determined according to the optical condition expression in each embodiment.

[0073] Optionally, in some embodiments, the second lens 102 is an aspherical lens, and satisfies the following conditions: 1.0 < Dia / r < 1.5, and / or 0.60 < |ΔSag_max / f| < 0.85.

[0074] 1.0<Dia / r<1.5 is expression (3), Dia represents the effective radius of the image side surface of the second lens 102, and r represents the central curvature radius of the image side surface of the second lens 102. In order to correct the distortion generated by the optical system with a field angle of 90 degrees or more, it is necessary to use an aspherical lens under appropriate conditions to appropriately correct the distortion generated by the light rays at a large angle. When the second lens 102 is an aspherical lens, if Dia / r is not more than 1.0, the effect of the aspherical surface is insufficient, resulting in insufficient correction of the distortion generated when the lens is miniaturized. If Dia / r is not less than 1.5, the local curvature radius of the outer peripheral portion of the second lens 102 will be too small, total reflection of the peripheral light rays will easily occur, and the angle of the lens surface will also be large, resulting in difficulty in lens processing.

[0075] 0.60<|ΔSag_max / f|<0.85 is expression (4), and ΔSag_max represents the maximum value of the aspherical amount in the region where the lens radius of the image side surface of the second lens 102 is equal to the curvature radius value. If |ΔSag_max / f| is not more than 0.60, the aspherical amount is small, and the distortion generated when the lens is miniaturized cannot be sufficiently corrected. If |ΔSag_max / f| is not less than 0.85, the local curvature radius of the outer peripheral portion of the second lens 102 will be small, and total reflection of the light rays will occur. The general aspherical amount refers to the difference between the sag amount at a certain lens diameter and the aspherical sag amount at the same lens diameter with the central curvature radius as the reference, but ΔSag_max defined here refers to the difference between the sag amount of the aspherical surface and the sag amount of the spherical lens with the central curvature radius as the curvature radius at the same diameter position within the range where the lens diameter is not more than the central curvature radius value.

[0076] Optionally, in some embodiments, the wide-angle lens also satisfies at least one of the following expressions (3a) to (4a).

[0077] In order to make the wide-angle lens have better distortion correction effect, and take into account the size miniaturization and the convenience of processing and manufacturing, on the basis of the foregoing embodiment expression (3), the wide-angle lens can satisfy expression (3a): 1.1<Dia / r<1.4.

[0078] In order to make the wide-angle lens have a large aspherical amount and reduce total reflection, on the basis of the foregoing embodiment expression (4), the wide-angle lens can satisfy expression (4a): 0.68<|ΔSag_max / f|<0.80.

[0079] Optionally, in some embodiments, the eighth lens 108 is an aspherical lens. In the embodiment of the utility model, the eighth lens 108 closest to the image side is designed as an aspherical lens, which helps to improve the aberration correction ability, realize lens miniaturization and reduce the cost of the lens.

[0080] Optionally, in some embodiments, the wide-angle lens further satisfies at least one of the following expressions: -3.0 < f2 / f < -2.0, 2.0 < fR / f < 2.8.

[0081] -3.0 < f2 / f < -2.0 is expression (5), where f2 represents the focal length of the second lens 102. If f2 / f is not less than -3.0, the refractive power of the second lens 102 will be insufficient, which is not conducive to miniaturization. If f2 / f is not greater than -2.0, the refractive power of the second lens 102 will be too strong, which is prone to generate large distortion.

[0082] 2.0 < fR / f < 2.8 is expression (6), where fR represents the focal length of the second lens group 10c. If fR / f is not greater than 2.0, the refractive power of the second lens group 10c will be too strong, which is prone to generate field curvature and spherical aberration. If fR / f is not less than 2.8, as the focal length becomes longer, the second lens group 10c will also become longer, which is not conducive to miniaturization of the wide-angle lens.

[0083] Optionally, in some embodiments, the wide-angle lens further satisfies at least one of the following expressions (5a) to (6a).

[0084] In order to make the wide-angle lens have better refractive power and distortion correction effect, on the basis of the foregoing embodiment expression (5), the wide-angle lens can satisfy expression (5a): -2.6 < f2 / f < -2.3.

[0085] In order to make the wide-angle lens have better refractive power and smaller size, on the basis of the foregoing embodiment expression (6), the wide-angle lens can satisfy expression (6a): 2.4 < fR / f < 2.75.

[0086] Optionally, in some embodiments, the wide-angle lens further satisfies at least one of the following expressions: 5.5 < LF / f < 7.5, 6.5 < LR / f < 8.5.

[0087] 5.5 < LF / f < 7.5 is expression (7), where LF represents the distance from the first lens 101 to the center of the reflecting surface of the reflecting optical element 10b. If LF / f is not greater than 5.5, the length of the first lens group 10a will be short, but the refractive power of the first lens group 10a will also be too strong, which will result in large distortion. If LF / f is not less than 7.5, the protruding amount of the wide-angle lens from the main body will become large, which cannot achieve miniaturization.

[0088] 6.5 < LR / f < 8.5 is expression (8), and LR indicates a distance from a center of a reflection surface of the reflection optical element 10b to an image plane. If LR / f is not more than 6.5, the length of the second lens group 10c becomes short, but the refractive power of the second lens group 10c also becomes too strong, and field curvature and spherical aberration are easily generated. If LR / f is not less than 8.5, the second lens group becomes too long, and this is not good for miniaturization of the product.

[0089] Optionally, in some embodiments, the wide-angle lens further satisfies at least one of the following expressions (7a) to (8a).

[0090] In order to make the first lens group 10a have both a good refractive power and a small size, on the basis of the aforementioned embodiment expression (7), the wide-angle lens can satisfy expression (7a): 6.1 < LF / f < 7.2.

[0091] In order to make the second lens group 10c have both a good refractive power and a small size, on the basis of the aforementioned embodiment expression (8), the wide-angle lens can satisfy expression (8a): 7.3 < LR / f < 8.1.

[0092] Optionally, in some embodiments, when the eighth lens 108 is an aspherical lens, the wide-angle lens further satisfies the following expression (9): 7.5 < fp / f < 55, and fp indicates a focal length of the eighth lens 108. If fp / f is not more than 7.5, the refractive power of the eighth lens 108 becomes too strong, and this causes a change in the position of a focal point and aberration due to a temperature change, and good image quality cannot be obtained. If fp / f is not less than 55, the refractive power of the eighth lens 108 becomes too weak, and although a change in the position of a focal point due to a temperature change can be suppressed, correction of astigmatism and the like is insufficient. In addition, the eighth lens 108 can also be a lens made of resin, and this can achieve the effects of low cost and light weight.

[0093] Optionally, in some embodiments, in order to make the eighth lens 108 have a suitable refractive power and correction ability of astigmatism and the like, the wide-angle lens further satisfies the following expression (9a): 8.0 < fp / f < 45.

[0094] Optionally, the wide-angle lens further satisfies the following expression (10): 1.0 < f12 / f < 1.8, and / or, 5.5 < f1 / f < 7.5, where f1 indicates a focal length of a lens closest to the object side, and f12 indicates a focal length of the first lens group 10a.

[0095] In the wide-angle lens, when f12 / f is not more than 1.0, the positive refractive power becomes too strong, although the size of the lens is shortened, but field curvature is generated, resulting in the resolution of the peripheral part of the picture to be reduced, when f12 / f is not less than 1.8, the positive refractive power becomes weak, resulting in the size of the lens to be large. If f1 / f is not more than 5.5, the aberration is too large to be corrected, if f1 / f is not less than 7.5, the size of the lens is too large.

[0096] Optionally, in some embodiments, a positive power focusing lens can also be arranged in the first lens group 10a or the second lens group 10c, whether the focusing lens belongs to the first lens group 10a or the second lens group 10c, it is installed and arranged at the position closest to the reflective optical element 10b. When the focusing lens belongs to the first lens group 10a, the incident light rays entering the reflective optical element 10b can be corrected. When the focusing lens belongs to the second lens group 10c, the reflected light rays emitted from the reflective optical element 10b can be corrected. For example, in the foregoing embodiment, the focusing lens can be the third lens 103.

[0097] The implementation process of the present application will be described in detail below with specific embodiments as examples.

[0098] The numbers 1, 2, 3, and 4 in each table of the following examples respectively correspond to the mirror surfaces of the first lens 101 and the second lens 102, which are respectively represented by F1 to F4 in the drawings, and the corresponding d respectively represents the distance between the adjacent two surfaces.

[0099] For example, the d corresponding to the number 1 represents the distance between F1 and F2 (i.e. the thickness of the first lens 101). The numbers 5 and 6 respectively correspond to the two surfaces of the reflective optical element 10b close to the object side and the image side, which are respectively represented by F5 to F6 in the drawings. The numbers 7 and 8 correspond to the mirror surfaces of the third lens 103, which are respectively represented by F7 to F8 in the drawings. The number 9 represents the diaphragm, and the d corresponding to the number 9 represents the thickness of the diaphragm.

[0100] Reference numeral 10 denotes the fourth lens 104, whose two surfaces are shown as F9 and F10, and d denotes the thickness of the fourth lens 104. Reference numeral 11 denotes the fifth lens 105, whose two surfaces are shown as F11 and F12, and d denotes the thickness of the fifth lens 105. Reference numeral 12 denotes the distance between the fifth lens 105 and the sixth lens 106. Reference numeral 13 denotes the sixth lens 106, whose two surfaces are shown as F13 and F14, and d denotes the thickness of the sixth lens 106. Reference numeral 14 denotes the seventh lens 107, whose two surfaces are shown as F15 and F16, and d denotes the thickness of the seventh lens 107. Reference numeral 15 denotes the distance between the seventh lens 107 and the eighth lens 108. The surfaces corresponding to the eighth lens element 108 are F17 and F18, respectively. Reference numeral 16 indicates the parameter corresponding to surface F17, where d represents the thickness of the eighth lens element 108. Reference numeral 17 indicates the parameter corresponding to surface F18, where d represents the distance between surface F18 and the optical filter. Reference numeral 18 indicates the thickness of the optical filter, and reference numeral 19 indicates the distance between the optical filter and the image plane.

[0101] In each numerical example, r represents the radius of curvature, d represents the thickness / distance, and Dia represents the outer diameter of the lens, all in mm. nd represents the refractive index for the d-line, and νd represents the Abbe number for the d-line. A surface number with an "*" indicates that the surface is aspherical. The aspheric shape can be defined by the formula given in the previous examples.

[0102] Numerical Example 1:

[0103] The wide-angle lens of numerical example 1 corresponds to Figure 1 The various surface data of the wide-angle lens of Numerical Example 1 are shown in Table 1, the data of the aspherical lens are shown in Table 2, and the various data in the focusing state at an object point of 1.5m are shown in Table 3.

[0104] Table 1: Surface parameters of each lens in Numerical Example 1

[0105]

[0106] Table 2: Aspheric parameters in numerical example 1

[0107] Number K A4 A6 A8 A10 A12 3 -2.64990E+02 -1.22001E-04 -2.05944E-06 4.76349E-08 -3.47684E-12 -2.30060E-12 4 -4.20265E-01 -5.45145E-04 1.43843E-05 -1.79893E-06 2.38076E-08 -1.42029E-10 7 0.00000E+00 6.10613E-05 1.78373E-06 1.66936E-07 0.00000E+00 0.00000E+00 8 0.00000E+00 5.03611E-04 -1.31539E-06 1.74273E-07 -6.10221E-10 -8.18375E-11 16 -6.61822E+00 2.98558E-03 -2.6855TE-04 1.66201E-05 -7.41118E-07 1.13958E-08 17 -2.03622E+00 -1.15277E-03 3.13992E-05 -3.43263E-06 -3.1798TE-08 -1.30681E-10

[0108] Table 3: Other parameters

[0109] Focal distance F number Half view angle Image height Lens total length Back focal length 2.498 1.940 100.000 4.600 39.500 0.050

[0110] Numerical Example 2:

[0111] The wide-angle lens of numerical example 2 corresponds toFigure 3 The various surface data of the wide-angle lens of Numerical Example 2 are shown in Table 4, the data of the aspherical lens are shown in Table 5, and the various data in the focusing state at an object point of 1.5m are shown in Table 6.

[0112] Table 4: Surface parameters of each lens in Numerical Example 2

[0113]

[0114] Table 5: Aspheric parameters in numerical example 2

[0115] Number K A4 A6 A8 A10 A12 3 -6.99434E+01 -1.11260E-04 -2.41557E-06 7.67973E-08 -1.01441E-09 6.85613E-12 4 -5.50278E-01 -9.8749TE-04 4.75823E-05 -3.31941E-06 5.35212E-08 -7.13737E-10 7 0.00000E+00 1.17317E-05 2.39774E-06 6.66422E-08 0.00000E+00 0.00000E+00 8 0.00000E+00 4.86188E-04 -1.66002E-06 1.01748E-07 9.92806E-11 -6.41668E-11 16 -4.90087E+00 3.85859E-03 -2.65035E-04 1.71800E-05 -6.63285E-07 1.13958E-08 17 3.79303E-01 -9.99487E-04 -3.23562E-05 2.38341E-06 -1.48576E-07 -1.30681E-10

[0116] Table 6: Other parameters

[0117] Focal distance F number Half view angle Image height Lens total length Back focal length 2.497 1.969 100.000 4.601 39.002 0.052

[0118] Numerical Example 3:

[0119] The wide-angle lens of numerical example 3 corresponds to Figure 5 The various surface data of the wide-angle lens of Numerical Example 3 are shown in Table 7, the data of the aspherical lens are shown in Table 8, and the various data in the focus state at an object point of 1.5m are shown in Table 9.

[0120] Table 7: Surface parameters of each lens in Numerical Example 3

[0121]

[0122] Table 8: Aspheric parameters in numerical example 3

[0123] Number K A4 A6 A8 A10 A12 3 -8.63456E+01 -5.27361E-05 -3.60887E-06 8.99276E-08 -9.46839E-10 4.52134E-12 4 -5.46362E-01 -9.20123E-04 4.94329E-05 -3.63341E-06 7.87325E-08 -1.28038E-09 7 0.00000E+00 8.67756E-05 3.05524E-06 2.20676E-07 0.00000E+00 0.00000E+00 8 0.00000E+00 6.07605E-04 -2.26118E-06 3.71515E-07 -7.85607E-09 -4.55672E-11 16 -6.60435E+00 2.94808E-03 -2.38810E-04 1.53614E-05 -6.50391E-07 1.13958E-08 17 -6.21271E-01 -7.61385E-04 2.56512E-05 -2.10350E-06 -1.87818E-08 -1.30681E-10

[0124] Table 9: Other parameters

[0125] Focal distance F number Half view angle Image height Lens total length Back focal length 2.498 1.901 100.000 4.600 40.000 0.050

[0126] Numerical Example 4:

[0127] The wide-angle lens of numerical example 4 corresponds to Figure 7 The various surface data of the wide-angle lens of Numerical Example 4 are shown in Table 10, the data of the aspherical lens are shown in Table 11, and the various data in the focused state at an object point of 1.5m are shown in Table 12.

[0128] Table 10: Surface parameters of each lens in Numerical Example 4

[0129]

[0130] Table 11: Aspheric parameters in numerical example 4

[0131] Number K A4 A6 A8 AIO A12 3 -3.7658TE+01 4.42729E-05 -4.36897E-06 4.6532TE-08 3.23029E-11 -1.89109E-12 4 -5.37331E-01 -7.07968E-04 5.80779E-05 -3.96211E-06 1.03491E-07 -2.43098E-09 7 0.00000E+00 -3.16557E-05 -1.1731TE-07 1.31805E-07 0.00000E+00 0.00000E+00 8 0.00000E+00 4.49925E-04 -5.45032E-06 3.53908E-07 -755868E-09 6.40951E-11 16 -7.68552E+00 2.38111E-03 -2.47265E-04 1.11675E-05 -2.37740E-07 -1.71126E-08 17 1.52692E+00 -1.56177E-03 3.9392TE-05 -8.92784E-06 3.38092E-07 -1.54300E-08

[0132] Table 12: Other parameters

[0133] Focal distance F number Half view angle Image height Lens total length Back focal length 2.497 1.994 100.000 4.600 38.001 0.051

[0134] Numerical Example 5:

[0135] The wide-angle lens of Numerical Example 5 corresponds to the embodiment shown in Figure 9 Table 13 shows the surface data of each lens of the wide-angle lens of Numerical Example 5, Table 14 shows the aspherical surface data, and Table 15 shows various data in the state of focusing at an object point of 1.5 m.

[0136] Table 13: Surface parameters of each lens of Numerical Example 5

[0137]

[0138] Table 14: Aspherical surface parameters in Numerical Example 5

[0139] Number K A4 A6 A8 A10 A12 3 -4.56005E+01 -2.62264E-05 -2.69678E-06 7.20124E-08 -8.65297E-10 4.26789E-12 4 -5.95756E-01 -1.29133E-03 6.09973E-05 -4.04046E-06 1.04802E-07 -2.19291E-09 7 0.00000E+00 1.90242E-04 3.48548E-06 6.14670E-07 0.00000E+00 0.00000E+00 8 0.00000E+00 7.86177E-04 -5.57616E-06 1.26085E-06 -4.45835E-08 1.95240E-10 16 -1.57799E+01 2.20920E-03 -2.44560E-04 1.30665E-05 -5.96256E-07 8.81925E-09 17 -2.76769E+00 -9.56484E-04 1.28404E-05 -1.05035E-06 -1.84124E-07 4.25870E-09

[0140] Table 15: Other parameters

[0141] Focal distance F number Half view angle Image height Lens total length Back focal length 2.495 1.940 100.000 4.600 39.000 0.051

[0142] Numerical Example 6:

[0143] The wide-angle lens of Numerical Example 6 corresponds to the embodiment shown in Figure 11 Table 16 shows the surface data of each lens of the wide-angle lens of Numerical Example 6, Table 17 shows the aspherical surface data, and Table 18 shows various data in the state of focusing at an object point of 1.5 m.

[0144] Table 16: Surface parameters of each lens of Numerical Example 6

[0145]

[0146] Table 17: Aspherical surface parameters in Numerical Example 6

[0147] Number K A4 A6 A8 A10 A12 3 -4.13302E+01 -5.47296E-05 -2.30004E-06 6.99992E-08 -8.81859E-10 4.5448TE-12 4 -5.80695E-01 -1.24165E-03 5.46887E-05 -3.94837E-06 1.04802E-07 -2.34723E-09 7 0.00000E+00 1.86925E-04 4.45354E-06 5.70525E-07 0.00000E+00 0.00000E+00 8 0.00000E+00 7.69234E-04 -2.25518E-06 8.20746E-07 -2.39582E-08 -1.67740E-10 16 -1.15963E+01 2.44481E-03 -2.36405E-04 1.24678E-05 -5.23421E-07 6.43456E-09 17 -2.05762E+00 -9.21361E-04 8.31082E-06 -9.96689E-07 -1.73600E-07 3.68832E-09

[0148] Table 18: Other parameters

[0149] Focal distance F number Half view angle Image height Lens total length Back focal length 2.496 1.921 100.000 4.600 39.001 0.051

[0150] In addition, for Numerical Examples 1 to 6 above, the parameters corresponding to the partial expressions of the foregoing embodiments can also be as shown in Table 19.

[0151] Table 19: Parameters satisfied by partial expressions of numerical examples 1 to 6

[0152] Expression Numerical implementation 1 Numerical implementation 2 Numerical implementation 3 Numerical implementation 4 Numerical implementation 5 Numerical implementation 6 TTL / f 15.8 15.6 16.0 15.2 15.6 15.6 f2 / f -2.50 -2.39 -2.50 -2.47 -2.50 -2.50 fR / f 2.70 2.70 2.62 2.54 2.51 2.52 LF / f 6.83 6.18 7.03 6.26 6.78 6.85 LR / f 7.44 8.01 7.66 7.68 7.77 7.61 Dia / r 1.19 1.19 1.22 1.24 1.35 1.35 |ΔSag_max / f 0.79 0.75 0.74 0.72 0.70 0.69 fp / f 9.38 13.96 8.65 8.45 40.00 20.00

[0153] As Figure 13 shown, a structure schematic diagram of a photographing device is shown. The photographing device has a CMOS sensor or a CCD sensor, and a wide-angle lens can be fixedly installed in front of the sensor and located on a light path of the sensor receiving light. The photographing device can be a mobile phone, a digital camera, a sports camera, a wearable smart device, etc. having a photographing function.

[0154] In the photographing device, by applying the wide-angle lens of the foregoing embodiments, the overall structure size of the photographing device can be reduced, and meanwhile, high-quality picture images can be captured.

[0155] Further, the photographing device can be a panoramic imaging system. The photographing device can include at least two wide-angle lenses. The two wide-angle lenses can be combined to form a 360° FOV, and thus achieve the effect of panoramic imaging. Specifically, as Figure 14 shown, the optical axis L1 of the first lens 101 and the second lens 102 in one wide-angle lens and the optical axis L2 of the first lens 101 and the second lens 102 in another wide-angle lens are arranged in parallel, and the optical axis L3 of the third lens 103 to the sixth lens 106 in one wide-angle lens and the optical axis L4 of the third lens 103 to the sixth lens 106 in another wide-angle lens are arranged in parallel. Figure 14 In the schematic, the optical axis L1 and the optical axis L2 can coincide, and the optical axis L3 and the optical axis L4 can coincide.

[0156] As Figure 15 shown, a structure schematic diagram of a movable platform is shown. The movable platform is installed with the wide-angle lens or the photographing device of any one of the foregoing embodiments. Exemplarily, the movable platform of the embodiment of the present application can be an unmanned aerial vehicle, a robot, an unmanned vehicle, or a handheld gimbal, etc. It should be understood that the photographing device carried by the movable platform can also be a panoramic imaging system, including at least two wide-angle lenses.

[0157] By applying the wide-angle lens or the photographing device of any one of the foregoing embodiments in the movable platform, the overall structure size of the movable platform can be reduced, the load can be reduced, the endurance can be improved, and meanwhile, high-quality picture images can be captured. For example, for the unmanned aerial vehicle device, the miniaturization and light weight of the wide-angle lens or the photographing device are more conducive to improving the endurance time of the unmanned aerial vehicle, prolonging the continuous photographing time, reducing the number of times of replacing or charging, and obtaining better image quality.

[0158] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment scheme according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0159] As used herein, "one embodiment," "an embodiment," or "one or more embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0160] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0161] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unit claim, several elements can be presented in a dependent manner, meaning that any of these elements can be further combined with the subject of the claim. The use of the word "at least" followed by a list of one or more items does not exclude additional items not listed. The word "comprise", "comprising", "comprises" or "comprising" does not exclude other elements or steps. The word "one" does not exclude the presence of a plurality of these elements or steps. The word "first", "second", "third", etc. does not imply any order. The use of the terms first, second, third, etc. does not limit the scope of the respective claims, which are to be interpreted as not relating to ranking of the technical solutions by their chronological order, but relating to the order of the description of the technical solutions.

[0162] Finally, it should be noted that the above embodiments are merely used to illustrate the technical solutions of the present application, rather than limiting them; although the foregoing embodiments of the present application have been described in detail, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent replacements; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A wide-angle lens characterized by comprising: The wide-angle lens comprises, in order from the object side to the image side along an optical axis, a first lens group having negative refractive power, a reflective optical element, and a second lens group having positive refractive power; the first lens group comprises at least two negative lenses, the second lens group comprises positive lenses and negative lenses, and the wide-angle lens satisfies the following conditions: 14 < TTL / f < 17; 90° < ω; wherein TTL is the distance on the optical axis between the object side surface of the lens closest to the object side and the imaging surface when an object at infinity is focused, f is the overall focal length of the wide-angle lens, and ω is the maximum angle of the incident light rays of the lens closest to the object side. The wide-angle lens comprises, in order from the object side to the image side along an optical axis, a first lens group having negative refractive power, a reflective optical element, and a second lens group having positive refractive power; the first lens group comprises at least two negative lenses, the second lens group comprises positive lenses and negative lenses, and the wide-angle lens satisfies the following conditions:

2. A wide-angle lens characterized by comprising: ω ≥ 100°; d ≥ 9.2 mm; wherein ω is the maximum angle of the incident light rays of the lens closest to the object side, and d is the maximum effective projection circle diameter corresponding to the wide-angle lens on the image sensor. The first lens group comprises a first lens and a second lens, and the first lens and the second lens both have negative refractive power; and / or, 3. The wide-angle lens according to claim 1 or 2, characterized in that The second lens group comprises, in order from the object side to the image side along an optical axis, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which have refractive powers of positive, positive, negative, negative, positive, and negative, respectively. The second lens group comprises at least two cemented lenses.

4. The wide-angle lens of claim 3, wherein The two cemented lenses are arranged adjacently.

5. The wide-angle lens of claim 4, wherein The fourth lens and the fifth lens form a first cemented lens, and the sixth lens and the seventh lens form a second cemented lens.

6. The wide-angle lens of claim 5, wherein The two cemented lenses comprise a first cemented lens and a second cemented lens, the wide-angle lens further comprises a first lens barrel and a second lens barrel, the first cemented lens is connected to the first lens barrel, the second cemented lens is connected to the second lens barrel, the first lens barrel is connected to the second lens barrel, and the coefficient of thermal expansion of the first lens barrel is smaller than that of the second lens barrel.

7. The wide-angle lens of claim 4, wherein The first lens group comprises at least one aspheric lens; and / or, the second lens group comprises at least one aspheric lens.

8. The wide-angle lens of claim 3, wherein The second lens is an aspheric lens, and satisfies the following conditions: 1.0 < Dia / r < 1.5, and / or, 0.60 < |ΔSag_max / f| < 0.85, wherein ΔSag_max represents the maximum value of the asphericity in the area where the image side surface of the second lens has a lens radius equal to the curvature radius value, Dia represents the effective radius of the image side surface of the second lens, and r represents the central curvature radius of the image side surface of the second lens.

9. The wide-angle lens of claim 8, wherein, And / or, the eighth lens is an aspheric lens, and the wide-angle lens further satisfies the following expression: 7.5 < fp / f < 55, wherein fp represents the focal length of the eighth lens. The wide-angle lens satisfies the following conditions: 1.19 ≤ Dia / r ≤ 1.35, and / or, 0.69 ≤ |ΔSag_max / f| ≤ 0.

79.

10. The wide-angle lens of claim 9, wherein ​ 11. The wide-angle lens of claim 3, wherein The wide-angle lens further satisfies at least one of the following expressions: -3.0 < f2 / f < -2.0, 2.0 < fR / f < 2.8; wherein f2 represents a focal length of the second lens, and fR represents a focal length of the second lens group.

12. The wide-angle lens of claim 11, wherein, The wide-angle lens further satisfies at least one of the following expressions: -2.5 ≤ f2 / f ≤ -2.39, 2.51 ≤ fR / f ≤ 2.

7.

13. The wide-angle lens of claim 3, wherein The wide-angle lens further satisfies at least one of the following expressions: 5.5 < LF / f < 7.5, 6.5 < LR / f < 8.5; wherein LF represents a distance from the first lens to a center of a reflecting surface of the reflecting optical element, and LR represents a distance from the center of the reflecting surface of the reflecting optical element to an image plane.

14. The wide-angle lens of claim 13, wherein, The wide-angle lens further satisfies at least one of the following expressions: 6.18 ≤ LF / f ≤ 7.03, 7.44 ≤ LR / f ≤ 8.

01.

15. The wide-angle lens of claim 9, wherein, The wide-angle lens further satisfies the following expression: 8.45 ≤ fp / f ≤ 40.

16. The wide-angle lens of claim 1 or 2, wherein The wide-angle lens further satisfies the following expressions: 1.0 < f12 / f < 1.8, and / or, 5.5 < f1 / f < 7.5; wherein f1 represents a focal length of a lens closest to an object side, and f12 represents a focal length of the first lens group.

17. The wide-angle lens of claim 1 or 2, wherein The first lens group further comprises a corrector lens with positive refractive power, the corrector lens being disposed close to the reflecting optical element; or the second lens group further comprises a corrector lens with positive refractive power, the corrector lens being disposed close to the reflecting optical element.

18. The wide-angle lens of claim 1, wherein, The wide-angle lens satisfies: 15.2 ≤ TTL / f ≤ 16.

19. An imaging device, characterized by comprising: The photographing device comprises the wide-angle lens according to any one of claims 1 to 18.

20. The photographing apparatus according to claim 19, wherein The photographing device comprises at least two wide-angle lenses, photographing directions of the at least two wide-angle lenses being different.

21. A movable platform, characterized by The movable platform comprises the wide-angle lens according to any one of claims 1 to 18 or the photographing device according to claims 19-20.

Images