Ultra-wide-angle ultra-short-focus full-width camera lens

Abstract

The embodiment of the utility model discloses an ultra-wide-angle and ultra-short-focus full-width camera lens, which comprises sixteen lenses which are sequentially arranged from an object space to an image space along an optical axis, and each lens has corresponding focal power; besides, a diaphragm is arranged between the eighth lens and the ninth lens to divide the sixteen lenses into two lens groups, namely a first lens group with negative total focal power and a second lens group with positive total focal power. According to the full-frame prime lens provided by the embodiment of the utility model, by using the optical structure of the 14 glass spherical lenses and the 2 glass aspherical lenses, when the full field angle is greater than or equal to 132 degrees, the distortion is small, and the purple edge phenomenon is improved. Besides, by adding the aspherical lens, the image quality of an edge field of view is also obviously improved under an ultra-short focal length, clear imaging can be realized, and the shooting feeling of almost zero distortion is achieved.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of optical lenses, and in particular to an ultra-wide-angle and ultra-short-focus full-frame camera lens. Background Art

[0002] Typically, when photographers want to capture scenes such as high-rise buildings, the sky, interior spaces, and panoramic landscapes, they need to use a fisheye lens to achieve the desired effect. However, fisheye lenses have large distortion, which causes serious deformation of the scenery. Compared with fisheye lenses, ultra-wide-angle lenses can simultaneously have a wide field of view and very low distortion.

[0003] Therefore, designing a full-frame lens with ultra-wide-angle viewing angle and low distortion has broad market prospects. Utility Model Content

[0004] This utility model provides an ultra-wide-angle, ultra-short-throw full-frame camera lens that achieves minimal distortion and improved purple fringing at a full field of view of 132° or greater. Furthermore, by adding aspherical lenses, image quality at the edges of the field of view is significantly improved at ultra-short focal lengths, enabling clear imaging and a near-distortion-free shooting experience.

[0005] The embodiment of the utility model provides an ultra-wide-angle and ultra-short-focus full-frame camera lens, comprising a first lens having negative optical power, a second lens having negative optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens having negative optical power, a sixth lens having positive optical power, a seventh lens having negative optical power, an eighth lens having positive optical power, an aperture stop, a ninth lens having positive optical power, a tenth lens having negative optical power, an eleventh lens having positive optical power, a twelfth lens having negative optical power, a thirteenth lens having positive optical power, a fourteenth lens having negative optical power, a fifteenth lens having positive optical power, and a sixteenth lens having positive optical power, which are arranged in sequence from the object side to the image side along the optical axis;

[0006] The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens constitute a first lens group having a negative total optical power;

[0007] The ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens, and the sixteenth lens constitute a second lens group having positive total refractive power.

[0008] Optionally, the third lens and the sixteenth lens are glass aspherical lenses, and the remaining lenses are glass spherical lenses.

[0009] Optionally, the first lens is a convex-concave lens, the second lens is a convex-concave lens, the third lens is a convex-concave lens, the fourth lens is a convex-convex lens, the fifth lens is a concave-concave lens, the sixth lens is a convex-convex lens, the seventh lens is a concave-convex lens, the eighth lens is a convex-concave lens, the ninth lens is a convex-convex lens, the tenth lens is a concave-concave lens, the eleventh lens is a convex-convex lens, the twelfth lens is a convex-concave lens, the thirteenth lens is a convex-convex lens, the fourteenth lens is a concave-concave lens, the fifteenth lens is a convex-convex lens with positive optical power, and the sixteenth lens is a concave-convex lens.

[0010] Optionally, the fourth lens and the fifth lens form a cemented lens group with negative optical power, and / or the tenth lens and the eleventh lens form a cemented lens group with negative optical power, and / or the twelfth lens and the thirteenth lens can form a cemented lens group with positive optical power.

[0011] Optionally, the first lens, the third lens, and the eighth lens respectively meet the following conditions with the full-frame camera lens:

[0012] -5.821≤f1 / f≤-5.444;

[0013] -2.086≤f3 / f≤-1.813;

[0014] -4.763≤f8 / f≤-2.929;

[0015] Among them, f1, f3, f8 are the focal lengths of the first lens, the third lens, and the eighth lens respectively, and f is the focal length of the full-frame camera lens.

[0016] Optionally, the first lens group and the second lens group meet the following conditions:

[0017] -0.0250<φ1<0.0025;

[0018] 0.0330<φ2<0.0379;

[0019] -0.6605<(φ1 / φ2)<-0.0758;

[0020] Wherein, φ1 and φ2 are the optical powers of the first lens group and the second lens group respectively.

[0021] Optionally, the full-frame camera lens meets the following conditions:

[0022] 0.135≤f / w≤0.152;

[0023] Wherein, f is the focal length of the full-frame camera lens, and w is the half field of view angle of the full-frame camera lens.

[0024] Optionally, the first lens, the second lens, and the fifteenth lens meet the following conditions:

[0025] 1.75≤nd1≤1.93, 32.60≤vd1≤50.90;

[0026] 1.59≤nd13≤1.60, 22.00≤vd13≤69.90;

[0027] 1.55≤nd16≤1.83, 40.00≤vd16≤60.30;

[0028] Among them, nd1, nd13, and nd16 are the refractive indices of the first lens, the third lens, and the sixteenth lens respectively; vd1, vd13, and vd16 are the Abbe numbers of the first lens, the third lens, and the sixteenth lens respectively.

[0029] Optionally, the sixth lens and the seventh lens meet the following conditions:

[0030] 100.6≥|Vd12+Vd13|≥40.00;

[0031] 92.60≥|Vd14+Vd15|≥76.20;

[0032] Wherein, Vd12, Vd13, Vd14 and Vd15 are the Abbe numbers of the twelfth lens, the thirteenth lens, the fourteenth lens and the fifteenth lens respectively.

[0033] Optionally, the full-frame camera lens meets the following conditions:

[0034] 0.2062 <BFL / TTL<0.2184;

[0035] Wherein, BFL is the back focus of the full-frame camera lens, and TTL is the total optical length of the full-frame camera lens.

[0036] The technical solution of the embodiment of the present utility model divides the sixteen lenses of the full-frame camera lens into two lens groups with the aperture as the boundary. By adjusting the optical focal length of the lenses in the two lens groups, the light propagation mode in the system is adjusted to achieve the purpose of improving image quality. Specifically, the first three lenses are all lenses with negative optical power, which ensures that the light of a large field of view can be quickly gathered into the optical system; the fourth lens, fifth lens, sixth lens and seventh lens, whose optical power is positive and negative respectively, can achieve the effect of smoothing the light, and the eighth lens with positive optical power is responsible for continuing to shrink the light; after passing through the aperture and the ninth lens, the tenth lens, eleventh lens, twelfth lens and thirteenth lens can better correct the chromatic aberration of the light after passing through the aperture; the tenth lens to the fifteenth lens can better correct the field curvature under a large field of view by reasonably distributing the optical power, for example, the tenth lens and the eleventh lens form a cemented lens group with negative optical power, the twelfth lens and the thirteenth lens form a cemented lens group with positive optical power, and the fourteenth lens and the fifteenth lens are set to negative and positive optical power, respectively. The sixteenth lens, as the last lens, is responsible for correcting off-axis light and improving the image quality of the edge field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of an ultra-wide-angle, ultra-short-focus full-frame camera lens provided in Example 1 of the present utility model;

[0038] Figure 2 yes Figure 1 The vertical axis chromatic aberration curve of the full-frame camera lens at the optimal object distance is shown;

[0039] Figure 3 yes Figure 1 The field curvature distortion curve of the full-frame camera lens at the optimal object distance is shown;

[0040] Figure 4 yes Figure 1 The resolution MTF curve of the full-frame camera lens at the optimal object distance is shown;

[0041] Figure 5 This is a schematic structural diagram of an ultra-wide-angle, ultra-short-focus full-frame camera lens provided in the second embodiment of the present invention;

[0042] Figure 6 yes Figure 5 The vertical axis chromatic aberration curve of the full-frame camera lens at the optimal object distance is shown;

[0043] Figure 7 yes Figure 5 The field curvature distortion curve of the full-frame camera lens at the optimal object distance is shown;

[0044] Figure 8 yes Figure 5The resolution MTF curve of the full-frame camera lens at the optimal object distance is shown;

[0045] Figure 9 This is a schematic structural diagram of an ultra-wide-angle, ultra-short-focus full-frame camera lens provided in Example 3 of the present utility model;

[0046] Figure 10 yes Figure 9 The vertical axis chromatic aberration curve of the full-frame camera lens at the optimal object distance is shown;

[0047] Figure 11 yes Figure 9 The field curvature distortion curve of the full-frame camera lens at the optimal object distance is shown;

[0048] Figure 12 yes Figure 9 The MTF curve of the resolution of the full-frame camera lens at the optimal object distance is shown. DETAILED DESCRIPTION

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0050] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present invention are described based on the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be formed directly "on" or "under" another element, but can also be formed indirectly "on" or "under" another element through an intermediate element. The terms "first", "second", etc. are only used for descriptive purposes and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0051] The term "including" and its variations used in the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment".

[0052] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish the corresponding contents, and are not used to limit the order or mutual dependence.

[0053] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0054] Figure 1 This is a schematic diagram of the structure of an ultra-wide-angle and ultra-short-focus full-frame camera lens provided by the first embodiment of the present invention, with reference to Figure 1 The full-frame camera lens comprises, arranged in sequence from the object side to the image side along the optical axis, a first lens L1 with negative focal power, a second lens L2 with negative focal power, a third lens L3 with negative focal power, a fourth lens L4 with positive focal power, a fifth lens L5 with negative focal power, a sixth lens L6 with positive focal power, a seventh lens L7 with negative focal power, an eighth lens L8 with positive focal power, an aperture STO, a ninth lens L9 with positive focal power, a tenth lens L10 with negative focal power, an eleventh lens L11 with positive focal power, a twelfth lens L12 with negative focal power, a thirteenth lens L13 with positive focal power, a fourteenth lens L14 with negative focal power, a fifteenth lens L15 with positive focal power, and a sixteenth lens L16 with positive focal power;

[0055] The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the seventh lens L7 and the eighth lens L8 constitute a first lens group having a negative total optical power;

[0056] The ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the fourteenth lens L14, the fifteenth lens L15 and the sixteenth lens L16 constitute a second lens group having positive total refractive power.

[0057] First of all, for optical lenses, the focal length is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal length, the stronger the ability to bend light, and the smaller the absolute value of the focal length, the weaker the ability to bend light. When the focal length is a positive number, the refraction of light is convergent; when the focal length is a negative number, the refraction of light is divergent. The focal length can be used to characterize a certain refractive surface of a lens (i.e., a surface of a lens), can be used to characterize a certain lens, and can also be used to characterize a system formed by multiple lenses (i.e., a lens group).

[0058] In the full-frame camera lens provided in this embodiment, each lens can be arranged in a lens barrel ( Figure 1 (not shown) in the Figure 1As shown, in the embodiment of the present invention, the sixteen lenses of the full-frame camera lens are divided into two lens groups with the aperture STO as the boundary. By adjusting the optical power of the lenses in the two lens groups, the light propagation mode in the system is adjusted to achieve the purpose of improving image quality. Specifically, the first three lenses are all lenses with negative optical power, which ensures that the light of a large field of view is quickly gathered into the optical system; the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7, whose optical power is positive and negative in sequence, can achieve the effect of smoothing the light, and the eighth lens L8 with positive optical power is responsible for continuing to shrink the light; after passing through the aperture STO and the ninth lens L9, the tenth lens L10, the eleventh lens L11, the twelfth lens L12 and the thirteenth lens L13 can better correct the light passing through the aperture Chromatic aberration of light after STO; the tenth lens L10 to the fifteenth lens L15 can better correct the field curvature under a large field of view by reasonably distributing the optical power. For example, the tenth lens L10 and the eleventh lens L11 form a cemented lens group with negative optical power, the twelfth lens L12 and the thirteenth lens L13 form a cemented lens group with positive optical power, and the fourteenth lens L14 and the fifteenth lens L15 are set to negative and positive optical powers. The sixteenth lens L16, as the last lens, is responsible for correcting off-axis light and improving the image quality of the marginal field of view.

[0059] In addition, those skilled in the art will appreciate that the aperture STO is used in an optical system to limit the size of the light beam, determining the amount of light that passes through the lens and enters the photosensitive element, that is, to control the light throughput of the lens. In other words, the aperture STO directly determines the size of the aperture of the optical lens. Placing the aperture STO between the first lens group and the second lens group essentially limits the specific position of the aperture STO at the waist of the entire optical system, thereby enabling precise control of the light throughput, increasing the height of the central principal light at the aperture STO position, and expanding the aperture to ensure the amount of light passing through the aperture STO and image brightness. Furthermore, the aperture STO can block off-axis light, effectively reducing off-axis aberrations and ensuring image clarity. Thus, the embodiment of the present invention can achieve a full field of view angle ≥132° while also having minimal distortion and improved purple fringing.

[0060] In a specific embodiment, optionally, the third lens L3 and the sixteenth lens L16 are glass aspherical lenses, and the remaining lenses are glass spherical lenses.

[0061] In this embodiment, the full-frame camera lens utilizes an optical structure comprised of 14 glass spherical elements and two glass aspherical elements, resulting in an all-glass fixed-focus lens. The sixteenth lens, L16, serves as the final element and is an aspherical lens, which provides better correction for off-axis light and enhances image quality at the edges of the field of view. The addition of aspherical elements significantly improves image quality at the edges of the field of view even at ultra-short focal lengths, enabling clear imaging and virtually distortion-free shooting.

[0062] In a specific embodiment, optionally, the first lens L1 is a convex-concave lens, the second lens L2 is a convex-concave lens, the third lens L3 is a convex-concave lens, the fourth lens L4 is a convex-convex lens, the fifth lens L5 is a concave-concave lens, the sixth lens L6 is a convex-convex lens, the seventh lens L7 is a concave-convex lens, the eighth lens L8 is a convex-concave lens, the ninth lens L9 is a convex-convex lens, the tenth lens L10 is a concave-concave lens, the eleventh lens L11 is a convex-convex lens, the twelfth lens L12 is a convex-concave lens, the thirteenth lens L13 is a convex-convex lens, the fourteenth lens L14 is a concave-concave lens, the fifteenth lens L15 is a convex-convex lens with positive refractive power, and the sixteenth lens L16 is a concave-convex lens.

[0063] In a specific embodiment, optionally, the fourth lens L4 and the fifth lens L5 form a cemented lens group with negative optical power, and / or the tenth lens L10 and the eleventh lens L11 form a cemented lens group with negative optical power, and / or the twelfth lens L12 and the thirteenth lens L13 can form a cemented lens group with positive optical power.

[0064] In this embodiment, the surfaces of adjacent partial lenses are glued together to form a glued lens group, which can reduce the distance between lenses, and at the same time can properly correct chromatic aberration, and can also improve field curvature and coma, thereby further optimizing the imaging quality.

[0065] In a specific embodiment, optionally, the first lens L1, the third lens L3, and the eighth lens L8 respectively meet the following conditions with the full-frame camera lens:

[0066] -5.821≤f1 / f≤-5.444;

[0067] -2.086≤f3 / f≤-1.813;

[0068] -4.763≤f8 / f≤-2.929;

[0069] Among them, f1, f3, f8 are the focal lengths of the first lens L1, the third lens L3 and the eighth lens L8 respectively, and f is the focal length of the full-frame camera lens.

[0070] Those skilled in the art will recognize that focal length is the inverse of optical power. By properly allocating the optical power of each lens element, light can be more efficiently distributed throughout the optical system, reducing spherical aberration and field curvature, and ensuring image quality both on-axis and off-axis. When the first lens element L1, the third lens element L3, and the eighth lens element L8 meet the aforementioned conditions with a full-frame camera lens, the lens element is divergent, facilitating the convergence of light from a wider angle and achieving a greater detection range. This also helps balance system tolerances and reduce assembly sensitivity.

[0071] In a specific embodiment, optionally, the first lens group and the second lens group satisfy the following conditions:

[0072] -0.0250<φ1<0.0025;

[0073] 0.0330<φ2<0.0379;

[0074] -0.6605<(φ1 / φ2)<-0.0758;

[0075] Wherein, φ1 and φ2 are the optical powers of the first lens group and the second lens group respectively.

[0076] In this embodiment, the first lens group is configured to have an optical power range of -0.0250<φ1<0.0025, which is used to quickly collect light rays at large angles, and pass the large-angle incident angle through the aperture STO at a smaller angle to enter the second lens group. The second lens group is configured to have an optical power range of 0.0330<φ2<0.0379, which is beneficial for suppressing the angle of the edge field of view incident on the imaging surface and effectively transmitting more light beams to the imaging surface to match the chip CRA curve requirements. In addition, the aperture STO is located in the middle of the lens, with the first lens group in front of the aperture STO and the second lens group behind the aperture STO. When the optical power of the two lens groups meets the requirement of -0.6605<|φ1 / φ2|<-0.0758, the lenses are arranged symmetrically, which is beneficial for reducing distortion.

[0077] In a specific embodiment, optionally, the full-frame camera lens satisfies the following conditions:

[0078] 0.135≤f / w≤0.152;

[0079] Among them, f is the focal length of the full-frame camera lens, and w is the half field of view angle of the full-frame camera lens.

[0080] In this embodiment, since the focal length required for the full-frame camera lens is shorter and the field of view angle is larger, when the above conditions are met, clear imaging can still be achieved at a larger angle field of view, the depth of field is shallower, and the lens can be more compact.

[0081] In a specific embodiment, optionally, the first lens L1, the second lens L2, and the fifteenth lens L15 satisfy the following conditions:

[0082] 1.75≤nd1≤1.93, 32.60≤vd1≤50.90;

[0083] 1.59≤nd13≤1.60, 22.00≤vd13≤69.90;

[0084] 1.55≤nd16≤1.83, 40.00≤vd16≤60.30;

[0085] Wherein, nd1, nd13, and nd16 are the refractive indices of the first lens L1, the third lens L3, and the sixteenth lens L16 respectively; vd1, vd13, and vd16 are the Abbe numbers of the first lens L1, the third lens L3, and the sixteenth lens L16 respectively.

[0086] In this embodiment, since the required field of view of a full-frame camera lens is relatively large, the first lens element L1, as a convex-concave lens with negative optical power, satisfies the range of 1.75≤nd1≤1.93, and can quickly gather light and share the aberration pressure of a large field of view. At the same time, it can also effectively compress the overall lens diameter of the lens and achieve miniaturization of the lens. The thirteenth lens element L13, as a positive lens element, satisfies the range of 22.00≤vd13≤69.90, and can be used in combination with the twelfth lens element L12 to effectively control axial chromatic aberration. The sixteenth lens element L16, as a negative lens element, satisfies the range of 1.55≤nd16≤1.83 and 40.00≤vd16≤60.30, and can effectively improve the image quality of the final lens element in the marginal market where the image is incident at a large angle to the image plane.

[0087] In a specific embodiment, optionally, the sixth lens L6 and the seventh lens L7 satisfy the following conditions:

[0088] 100.6≥|Vd12+Vd13|≥40.00;

[0089] 92.60≥|Vd14+Vd15|≥76.20;

[0090] Here, Vd12, Vd13, Vd14, and Vd15 are the Abbe numbers of the twelfth lens L12, the thirteenth lens L13, the fourteenth lens L14, and the fifteenth lens L15, respectively.

[0091] When the sixth lens L6 and the seventh lens L7 meet the above conditions, the spherical aberration and off-axis aberration generated after the light passes through the first lens group can be effectively controlled, and the chromatic aberration can be minimized when the light enters the aperture STO with a large change in the folding angle, thereby balancing some off-axis chromatic aberration.

[0092] In a specific embodiment, optionally, the full-frame camera lens satisfies the following conditions:

[0093] 0.2062 <BFL / TTL<0.2184;

[0094] Among them, BFL is the back focus of the full-frame camera lens, and TTL is the total optical length of the full-frame camera lens.

[0095] In this embodiment, by reasonably selecting the back focus and total length of the lens, the lens can ensure sufficient installation space for the imaging sensor and the flat filter, ensure that the lens will not interfere with the base and the housing during installation, and ensure that the equipment process of the ultra-wide-angle lens is simple.

[0096] Based on the same concept above, the present invention provides three different specific embodiments, whose optical power relationships and related physical optical parameter design ranges are shown in Table 1:

[0097] Table 1 Relationship between optical power and related physical and optical parameters in various embodiments

[0098]

[0099]

[0100] In the first embodiment of the present invention, reference is made to Figure 1 The structural composition, shape, and position of each component of the system are crucial to the system. The figure shows that the optical system consists of 16 optical lenses, with the aperture STO located to the image side of the eighth lens L8. A flat glass L17 is also provided along the object plane to the image plane; it is located on the image side of the sixteenth lens L16. This protects the photosensitive chip in the imaging sensor and ensures the imaging quality of the fixed-focus lens. The overall system layout is as follows: the eight lenses before the aperture STO form the first lens group, in which the fourth lens L4 and the fifth lens L5 are cemented together, and the sixth lens L6 and the seventh lens L7 are cemented together. The eight lenses after the aperture STO form the second lens group, in which the tenth lens L10 and the eleventh lens L11 are cemented together, and the twelfth lens L12 and the thirteenth lens L13 are cemented together.

[0101] like Figure 1 The parameter design values of each lens in the full-frame camera lens of the first embodiment are shown in Table 2:

[0102] Table 2: Design values of each lens in the full-frame camera lens of Example 1

[0103]

[0104]

[0105]

[0106] The surface numbers in Table 2 are numbered according to the order of the lens surfaces. The radius of curvature represents the degree of curvature of the lens surface; a positive value indicates that the surface is curved toward the image plane, while a negative value indicates that the surface is curved toward the object plane. "INF" indicates that the surface is flat and has an infinite radius of curvature. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the light-bending ability of the material between the current and next surfaces. A blank space represents the current position as air with a refractive index of 1. The Abbe number represents the light-dispersion properties of the material between the current and next surfaces. The semi-aperture represents half the aperture size of the current surface.

[0107] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following expression method:

[0108]

[0109] Where Z is the axial distance from the surface at a height r perpendicular to the optical axis to the vertex of the surface along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the fitting cone coefficient; a4, a6, a8, a 10 、a 12 is the high-order aspheric coefficient corresponding to the fourth, sixth, eighth, tenth, and twelfth order of the aspheric surface, a i r i The combination becomes the high-order terms corresponding to the aspheric surface.

[0110] The coefficient values of each aspheric surface in the above embodiment 1 are shown in Table 3:

[0111] Table 3 Aspheric surface parameters

[0112]

[0113]

[0114] Among them, 4.959805402E-05 means that the coefficient a4 of the surface number S5 is 4.959805402*10 -5 , and so on.

[0115] Figure 2 yes Figure 1 The vertical axis chromatic aberration curve of the full-frame camera lens at the optimal object distance is shown, where the vertical direction is the field of view, 0 represents the optical axis, and the vertical vertex represents the maximum half field of view; the horizontal direction represents the offset relative to the main wavelength, in microns (um). Excessive vertical axis chromatic aberration will cause the object image to disperse, affecting the image clarity. Figure 2 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a reasonable range, all are relatively close to the main light, and are basically within the Airy disk, which has a significant improvement on the common purple fringing phenomenon.

[0116] Figure 3 yes Figure 1 The field curvature distortion curve of the full-frame camera lens at the optimal object distance is shown in the figure. In the coordinate system on the right side of the figure, the horizontal coordinate represents the magnitude of the distortion, and the unit is %; the vertical coordinate represents the normalized image height, and there is no unit; Figure 3 It can be seen that the distortion of the lens provided in this embodiment is well corrected, which ensures the authenticity of the object image and minimizes the image distortion. In the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, without a unit; T represents the meridian, S represents the sagittal; Figure 3 It can be seen that the resolution difference between the center of the field curvature of the lens provided by this embodiment and that near the edge of the field of view is relatively small.

[0117] Figure 4 yes Figure 1 The MTF curve of the full-frame camera lens at the optimal object distance is shown. The horizontal axis is the spatial frequency, which refers to the number of black and white line pairs per 1mm. The vertical axis is the modulation modulus (M' / M), where M refers to the grating modulation before imaging and M' refers to the grating modulation after imaging, so 0≤M' / M≤1. The MTF curve shows the optical system's ability to resolve objects at different frequencies in different fields of view, meridian and sagittal directions, reflecting the degree of image quality after the object passes through the optical system. The higher the MTF, the higher the imaging quality of the lens. Figure 4 It can be seen that the MTF of the optical system in all meridian and sagittal directions of the field of view is greater than 0.4 when the spatial frequency is 40lp / mm, which has a very high imaging effect for SLR cameras.

[0118] Figure 5 This is a schematic diagram of the structure of an ultra-wide-angle and ultra-short-focus full-frame camera lens provided in the second embodiment of the present invention. In the second embodiment of the present invention, reference is made to Figure 5 The structural composition, shape, and position of each component of the system are crucial to the system. The figure shows that the optical system consists of 16 optical lenses, with the aperture STO located to the image side of the eighth lens L8. A flat glass L17 is also provided along the object plane to the image plane; it is located on the image side of the sixteenth lens L16. This protects the photosensitive chip in the imaging sensor and ensures the imaging quality of the fixed-focus lens. The overall system layout is as follows: the eight lenses before the aperture STO form the first lens group, in which the fourth lens L4 and the fifth lens L5 are cemented together, and the sixth lens L6 and the seventh lens L7 are cemented together. The eight lenses after the aperture STO form the second lens group, in which the tenth lens L10 and the eleventh lens L11 are cemented together, and the twelfth lens L12 and the thirteenth lens L13 are cemented together.

[0119] like Figure 5The parameter design values of each lens in the full-frame camera lens of the second embodiment are shown in Table 4:

[0120] Table 4: Design values of each lens in the full-frame camera lens of Example 2

[0121]

[0122]

[0123]

[0124] The surface numbers in Table 4 are numbered according to the order of the lens surfaces. The radius of curvature represents the degree of curvature of the lens surface; a positive value indicates that the surface is curved toward the image plane, while a negative value indicates that the surface is curved toward the object plane. "INF" indicates that the surface is flat and has an infinite radius of curvature. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the light-bending ability of the material between the current and next surfaces. A blank space represents the current position as air with a refractive index of 1. The Abbe number represents the light-dispersion properties of the material between the current and next surfaces. The semi-aperture represents half the aperture size of the current surface.

[0125] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following expression method:

[0126]

[0127] Where Z is the axial distance from the surface at a height r perpendicular to the optical axis to the vertex of the surface along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the fitting cone coefficient; a4, a6, a8, a 10 、a 12 is the high-order aspheric coefficient corresponding to the fourth, sixth, eighth, tenth, and twelfth order of the aspheric surface, a i r i The combination becomes the high-order terms corresponding to the aspheric surface.

[0128] The coefficient values of each aspheric surface in the above embodiment 2 are shown in Table 5:

[0129] Table 5 Aspheric surface parameters

[0130]

[0131]

[0132] Among them, 5.012216780E-05 means that the coefficient a4 of the surface number S5 is 5.012216780*10 -5 , and so on.

[0133] Figure 6 yes Figure 5 The vertical axis chromatic aberration curve of the full-frame camera lens at the optimal object distance is shown, where the vertical direction is the field of view, 0 represents the optical axis, and the vertical vertex represents the maximum half field of view; the horizontal direction represents the offset relative to the main wavelength, in microns (um). Excessive vertical axis chromatic aberration will cause the object image to disperse, affecting the image clarity. Figure 6 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a reasonable range, all are relatively close to the main light, and are basically within the Airy disk, which has a significant improvement on the common purple fringing phenomenon.

[0134] Figure 7 yes Figure 5 The field curvature distortion curve of the full-frame camera lens at the optimal object distance is shown in the figure. In the coordinate system on the right side of the figure, the horizontal coordinate represents the magnitude of the distortion, and the unit is %; the vertical coordinate represents the normalized image height, and there is no unit; Figure 7 It can be seen that the distortion of the lens provided in this embodiment is well corrected, which ensures the authenticity of the object image and minimizes the image distortion. In the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, without a unit; T represents the meridian, S represents the sagittal; Figure 7 It can be seen that the resolution difference between the center of the field curvature of the lens provided by this embodiment and that near the edge of the field of view is relatively small.

[0135] Figure 8 yes Figure 5 The MTF curve of the full-frame camera lens at the optimal object distance is shown. The horizontal axis is the spatial frequency, which refers to the number of black and white line pairs per 1mm. The vertical axis is the modulation modulus (M' / M), where M refers to the grating modulation before imaging and M' refers to the grating modulation after imaging, so 0≤M' / M≤1. The MTF curve shows the optical system's ability to resolve objects at different frequencies in different fields of view, meridian and sagittal directions, reflecting the degree of image quality after the object passes through the optical system. The higher the MTF, the higher the imaging quality of the lens. Figure 8 It can be seen that the MTF of the optical system in all meridian and sagittal directions of the field of view is greater than 0.4 when the spatial frequency is 40lp / mm, which has a very high imaging effect for SLR cameras.

[0136] Figure 9 This is a schematic diagram of the structure of an ultra-wide-angle and ultra-short-focus full-frame camera lens provided in the third embodiment of the present invention. In the third embodiment of the present invention, reference is made to Figure 9The structural composition, shape, and position of each component of the system are crucial to the system. The figure shows that the optical system consists of 16 optical lenses, with the aperture STO located to the image side of the eighth lens L8. A flat glass L17 is also provided along the object plane to the image plane; it is located on the image side of the sixteenth lens L16. This protects the photosensitive chip in the imaging sensor and ensures the imaging quality of the fixed-focus lens. The overall system layout is as follows: the eight lenses before the aperture STO form the first lens group, in which the fourth lens L4 and the fifth lens L5 are cemented together, and the sixth lens L6 and the seventh lens L7 are cemented together. The eight lenses after the aperture STO form the second lens group, in which the tenth lens L10 and the eleventh lens L11 are cemented together, and the twelfth lens L12 and the thirteenth lens L13 are cemented together.

[0137] like Figure 9 The parameter design values of each lens in the full-frame camera lens of the third embodiment are shown in Table 6:

[0138] Table 6: Design values of each lens in the full-frame camera lens of Example 3

[0139]

[0140]

[0141]

[0142] The surface numbers in Table 6 are numbered according to the order of the lens surfaces. The radius of curvature represents the degree of curvature of the lens surface; a positive value indicates that the surface is curved toward the image plane, while a negative value indicates that the surface is curved toward the object plane. "INF" indicates that the surface is flat and has an infinite radius of curvature. The thickness represents the axial distance from the center of the current surface to the next surface. The refractive index represents the light-bending ability of the material between the current and next surfaces. A blank space represents the current position as air with a refractive index of 1. The Abbe number represents the light-dispersion properties of the material between the current and next surfaces. The semi-aperture represents half the aperture size of the current surface.

[0143] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following expression method:

[0144]

[0145] Where Z is the axial distance from the surface at a height r perpendicular to the optical axis to the vertex of the surface along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the fitting cone coefficient; a4, a6, a8, a 10 、a 12 is the high-order aspheric coefficient corresponding to the fourth, sixth, eighth, tenth, and twelfth order of the aspheric surface, ai r i The combination becomes the high-order terms corresponding to the aspheric surface.

[0146] The coefficient values of each aspheric surface in the above embodiment 3 are shown in Table 7:

[0147] Table 7 Aspheric surface parameters

[0148]

[0149]

[0150] Among them, 5.440978483E-05 means that the coefficient a4 of the surface number S5 is 5.440978483*10 -5 , and so on.

[0151] Figure 10 yes Figure 9 The vertical axis chromatic aberration curve of the full-frame camera lens at the optimal object distance is shown, where the vertical direction is the field of view, 0 represents the optical axis, and the vertical vertex represents the maximum half field of view; the horizontal direction represents the offset relative to the main wavelength, in microns (um). Excessive vertical axis chromatic aberration will cause the object image to disperse, affecting the image clarity. Figure 10 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a reasonable range, all are relatively close to the main light, and are basically within the Airy disk, which has a significant improvement on the common purple fringing phenomenon.

[0152] Figure 11 yes Figure 9 The field curvature distortion curve of the full-frame camera lens at the optimal object distance is shown in the figure. In the coordinate system on the right side of the figure, the horizontal coordinate represents the magnitude of the distortion, and the unit is %; the vertical coordinate represents the normalized image height, and there is no unit; Figure 11 It can be seen that the distortion of the lens provided in this embodiment is well corrected, which ensures the authenticity of the object image and minimizes the image distortion. In the coordinate system on the left side of the figure, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, without a unit; T represents the meridian, S represents the sagittal; Figure 11 It can be seen that the resolution difference between the center of the field curvature of the lens provided by this embodiment and that near the edge of the field of view is relatively small.

[0153] Figure 12 yes Figure 9The MTF curve of the full-frame camera lens at the optimal object distance is shown. The horizontal axis is the spatial frequency, which refers to the number of black and white line pairs per 1mm. The vertical axis is the modulation modulus (M' / M), where M refers to the grating modulation before imaging and M' refers to the grating modulation after imaging, so 0≤M' / M≤1. The MTF curve shows the optical system's ability to resolve objects at different frequencies in different fields of view, meridian and sagittal directions, reflecting the degree of image quality after the object passes through the optical system. The higher the MTF, the higher the imaging quality of the lens. Figure 12 It can be seen that the MTF of the optical system in all meridian and sagittal directions of the field of view is greater than 0.4 when the spatial frequency is 40lp / mm, which has a very high imaging effect for SLR cameras.

[0154] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. An ultra-wide-angle and ultra-short-focus full-frame camera lens, characterized in that: comprising, arranged in order from the object side to the image side along the optical axis, a first lens having negative focal power, a second lens having negative focal power, a third lens having negative focal power, a fourth lens having positive focal power, a fifth lens having negative focal power, a sixth lens having positive focal power, a seventh lens having negative focal power, an eighth lens having positive focal power, a stop, a ninth lens having positive focal power, a tenth lens having negative focal power, an eleventh lens having positive focal power, a twelfth lens having negative focal power, a thirteenth lens having positive focal power, a fourteenth lens having negative focal power, a fifteenth lens having positive focal power, and a sixteenth lens having positive focal power; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the seventh lens and the eighth lens constitute a first lens group having a negative total optical power; The ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, the fourteenth lens, the fifteenth lens, and the sixteenth lens constitute a second lens group having positive total refractive power.

2. The full-frame camera lens according to claim 1, wherein: The third lens and the sixteenth lens are glass aspherical lenses, and the remaining lenses are glass spherical lenses.

3. The full-frame camera lens according to claim 1, wherein: The first lens is a convex-concave lens, the second lens is a convex-concave lens, the third lens is a convex-concave lens, the fourth lens is a convex-convex lens, the fifth lens is a concave-concave lens, the sixth lens is a convex-convex lens, the seventh lens is a concave-convex lens, the eighth lens is a convex-concave lens, the ninth lens is a convex-convex lens, the tenth lens is a concave-concave lens, the eleventh lens is a convex-convex lens, the twelfth lens is a convex-concave lens, the thirteenth lens is a convex-convex lens, the fourteenth lens is a concave-concave lens, the fifteenth lens is a convex-convex lens with positive optical power, and the sixteenth lens is a concave-convex lens.

4. The full-frame camera lens according to claim 1, wherein: The fourth lens and the fifth lens form a cemented lens group with negative optical power, and / or the tenth lens and the eleventh lens form a cemented lens group with negative optical power, and / or the twelfth lens and the thirteenth lens may form a cemented lens group with positive optical power.

5. The full-frame camera lens according to claim 1, wherein: The first lens, the third lens, and the eighth lens respectively meet the following conditions with the full-frame camera lens: -5.821≤f1 / f≤-5.444; -2.086≤f3 / f≤-1.813; -4.763≤f8 / f≤-2.929; Among them, f1, f3, f8 are the focal lengths of the first lens, the third lens, and the eighth lens respectively, and f is the focal length of the full-frame camera lens.

6. The full-frame camera lens according to claim 1, wherein: The first lens group and the second lens group meet the following conditions: -0.0250<φ1<0.0025; 0.0330<φ2<0.0379; -0.6605<(φ1 / φ2)<-0.0758; Wherein, φ1 and φ2 are the optical powers of the first lens group and the second lens group respectively.

7. The full-frame camera lens according to claim 1, wherein: The full-frame camera lens meets the following conditions: 0.135≤f / w≤0.152; Wherein, f is the focal length of the full-frame camera lens, and w is the half field of view angle of the full-frame camera lens.

8. The full-frame camera lens according to claim 1, wherein: The first lens, the second lens, and the fifteenth lens satisfy the following conditions: 1.75≤nd1≤1.93, 32.60≤vd1≤50.90; 1.59≤nd13≤1.60, 22.00≤vd13≤69.90; 1.55≤nd16≤1.83, 40.00≤vd16≤60.30; Among them, nd1, nd13, and nd16 are the refractive indices of the first lens, the third lens, and the sixteenth lens respectively; vd1, vd13, and vd16 are the Abbe numbers of the first lens, the third lens, and the sixteenth lens respectively.

9. The full-frame camera lens according to claim 1, wherein: The sixth lens and the seventh lens meet the following conditions: 100.6≥|Vd12+Vd13|≥40.00; 92.60≥|Vd14+Vd15|≥76.20; Wherein, Vd12, Vd13, Vd14 and Vd15 are the Abbe numbers of the twelfth lens, the thirteenth lens, the fourteenth lens and the fifteenth lens respectively.

10. The full-frame camera lens according to claim 1, wherein: The full-frame camera lens meets the following conditions: 0.2062 <BFL / TTL<0.2184; Wherein, BFL is the back focus of the full-frame camera lens, and TTL is the total optical length of the full-frame camera lens.

Images