Large-aperture camera lens with focal length of 16mm

Abstract

The utility model discloses a large-aperture camera lens with a focal length of 16mm, and aims to solve the problems that in the prior art, when a visual angle is slightly enlarged or shrunk due to focus change, a picture shakes unnecessarily, the fluency and the ornamental value of a video are influenced, and the visual angle of the video is not influenced. The utility model solves the technical problem that an existing lens lacks stability and consistency during video recording, and comprises an iris diaphragm, and a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side, the first lens group is composed of eight lenses and serves as a fixed group of the camera lens, and the focal power is positive; the iris diaphragm is located between the first lens group and the second lens group; the second lens group is composed of three lenses and serves as a focusing group of the camera lens, and the focal power is positive; the third lens group is composed of three lenses and serves as a fixed group of the camera lens, and the focal power is negative.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of camera lens, specifically relates to a 16mm focal length large aperture camera lens. BACKGROUND

[0002] With the rapid development of social media platforms and the popularity of short video content, more and more users tend to record and share their daily life through shooting Vlog (video blog). This trend has led to an increase in demand for high-performance, portable photography equipment, especially for those who want to easily carry and operate a mirrorless camera without compromising image quality. Video bloggers not only pursue high-quality static images, but also pay special attention to the expressiveness and stability of video content to ensure that viewers can have the best viewing experience.

[0003] In the prior art, the mirrorless lens product line mainly focuses on optimizing the quality of static images, such as providing a large aperture to achieve a shallow depth of field effect, reducing distortion to ensure image edge sharpness, and improving resolution to ensure detail reproduction. These lenses meet the needs of photographers for photo shooting, thus providing excellent performance in image quality.

[0004] The prior art has the following technical problems:

[0005] 1. The existing lens does not fully consider the characteristics and requirements of dynamic images during video shooting. For example, the "breathing effect" that occurs when adjusting the focus - a phenomenon caused by a slight enlargement or reduction of the viewing angle due to changes in focus - can cause unnecessary shaking of the picture, affecting the smoothness and watchability of the video.

[0006] 2. The existing lens lacks stability and consistency during video recording, resulting in a final output video quality that does not meet the standards of professional-level video. INVENTION CONTENT

[0007] To solve the above technical problems in the prior art, such as not fully considering the characteristics and requirements of dynamic images during video shooting, when the phenomenon of slight enlargement or reduction of the viewing angle due to changes in focus occurs, causing unnecessary shaking of the picture, affecting the smoothness and watchability of the video, and the existing lens lacking stability and consistency during video recording, the utility model provides a 16mm focal length large aperture camera lens.

[0008] The technical solution adopted by the utility model is as follows:

[0009] A 16mm focal length large aperture camera lens, comprising: a variable diaphragm, and a first lens group, a second lens group and a third lens group arranged in order from the object side to the image side;

[0010] The first lens group consists of eight lenses and serves as a fixed group for the camera lens, with positive optical power. The first lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side.

[0011] The variable aperture is located between the first lens group and the second lens group;

[0012] The second lens group consists of three lenses and serves as the focusing group of the camera lens, with positive optical power; the second lens group includes a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the object side to the image side;

[0013] The third lens group consists of three lenses and serves as a fixed group of the camera lens, with a negative optical power; the third lens group includes a twelfth lens, a thirteenth lens, and a fourteenth lens arranged sequentially from the object side to the image side.

[0014] Furthermore, the first lens is a positive lens, the second lens is a negative lens, the third lens is a positive lens, the fourth lens is a negative lens, the fifth lens is a negative lens, the sixth lens is a negative lens, the seventh lens is a positive lens, the eighth lens is a positive lens; the ninth lens is a negative lens, the tenth lens is a positive lens, the eleventh lens is a positive lens; the twelfth lens is a positive lens, the thirteenth lens is a negative lens, and the fourteenth lens is a negative lens.

[0015] Furthermore, the first lens mentioned above is a meniscus positive lens that bends toward the image side, and the first radius of curvature of the first lens and the second radius of curvature of the first lens satisfy the relationship: 1<(L1 R2+L1 R1) / (L1 R2-L1 R1)<4;

[0016] Wherein, L1 R1 represents the first radius of curvature, and L1 R2 represents the second radius of curvature;

[0017] Wherein, the first radius of curvature is the radius of curvature of the object side of the first lens, and the second radius of curvature is the radius of curvature of the image side of the first lens.

[0018] Furthermore, at least two lenses in the first lens group have a dispersion coefficient greater than 64.

[0019] Furthermore, the eighth lens described above is a biconvex glass aspherical positive lens, and the dispersion coefficient of the eighth lens is greater than 80.

[0020] Furthermore, the third radius of curvature of the eighth lens and the fourth radius of curvature of the eighth lens satisfy the following relationship: -3 < (L8R2 + L8R1) / (L8R2 - L8R1) < 1;

[0021] Wherein, L8R1 represents the third radius of curvature, and L8R2 represents the fourth radius of curvature;

[0022] Wherein, the third radius of curvature is the radius of curvature of the object side surface of the eighth lens, and the fourth radius of curvature is the radius of curvature of the image side surface of the eighth lens.

[0023] Furthermore, the total effective focal length f of the camera lens described above satisfies the relationship between the focal length FG1 of the first lens group and the following equation: 0.82 <FG1 / f<2.64。

[0024] Furthermore, the refractive index of each lens in the second lens group is greater than 1.72.

[0025] Furthermore, the total effective focal length f of the camera lens described above and the focal length FG2 of the second lens group satisfy the following relationship: 2.17 <FG2 / f<4.18。

[0026] Furthermore, the total effective focal length f of the camera lens and the focal length FG3 of the third lens group satisfy the following relationship: |FG3 / f|>10.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0028] 1. The lens design of this utility model is short and lightweight, which not only makes it easy to carry, but also reduces the burden on the photographer and improves comfort during long shooting sessions.

[0029] 2. This invention provides excellent low-light performance, enabling the capture of clear and bright images in low-light environments. Simultaneously, the large aperture helps create a shallow depth of field effect, highlighting the subject and enhancing visual appeal.

[0030] 3. This utility model divides the system into three independent lens groups. This design not only simplifies the overall structure but also improves tolerance tolerance, ensuring the stability and consistency of the lens during the production process.

[0031] 4. This invention is specifically optimized for video recording, particularly addressing the "breathing effect" problem during focus adjustment, i.e., the slight magnification or reduction of the viewing angle caused by focus changes. This significantly reduces image jitter and improves video smoothness and viewing experience.

[0032] 5. This lens is designed specifically to meet the needs of professional video creators, ensuring stability and consistency during video recording and meeting high professional standards. Its ability to handle both still images and dynamic video shooting makes it an ideal choice for photographers and videographers, capable of playing an outstanding role in both everyday recording and commercial projects. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein:

[0034] Figure 1 This is a structural schematic diagram of a 16mm focal length large aperture camera lens according to an embodiment of the present utility model;

[0035] Figure 2 This is a spherical aberration curve provided according to an embodiment of the present invention;

[0036] Figure 3 This is a field curvature curve diagram provided according to an embodiment of the present utility model;

[0037] Figure 4 This is a distortion curve diagram provided according to an embodiment of the present utility model.

[0038] Reference numerals: G1 - First lens group, G2 - Second lens group, G3 - Third lens group, STP - Variable aperture, 1 - First lens, 2 - Second lens, 3 - Third lens, 4 - Fourth lens, 5 - Fifth lens, 6 - Sixth lens, 7 - Seventh lens, 8 - Eighth lens / 9 - Ninth lens, 10 - Tenth lens, 11 - Eleventh lens, 12 - Twelfth lens, 13 - Thirteenth lens, 14 - Fourteenth lens. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0043] like Figure 1 As shown, the present invention provides a 16mm focal length large aperture camera lens, including: a variable aperture STP, and a first lens group G1, a second lens group G2 and a third lens group G3 arranged sequentially from the object side to the image side;

[0044] The first lens group G1 consists of eight lenses and serves as a fixed group of the camera lens, with positive optical power; the first lens group G1 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7 and an eighth lens 8 arranged sequentially from the object side to the image side.

[0045] The variable aperture STP is located between the first lens group G1 and the second lens group G2;

[0046] The second lens group G2 consists of three lenses and serves as the focusing group of the camera lens, with positive optical power; the second lens group G2 includes a ninth lens 9, a tenth lens 10, and an eleventh lens 11 arranged sequentially from the object side to the image side;

[0047] The third lens group G3 consists of three lenses and serves as a fixed group of the camera lens, with a negative optical power. The third lens group G3 includes a twelfth lens 12, a thirteenth lens 13, and a fourteenth lens 14 arranged sequentially from the object side to the image side.

[0048] In summary, the large aperture design with a 16mm focal length in this embodiment enables the lens to perform excellently in low-light environments and create a shallow depth-of-field effect. Dividing the lens into three lens groups (fixed group, focusing group, and fixed group) simplifies the overall structure, improves tolerance, and ensures image quality at different shooting distances. Placing the variable aperture STP between the first lens group G1 and the second lens group G2 helps to balance light distribution, reduce aberrations, and improve image quality.

[0049] Optionally, the first lens 1 is a positive lens, the second lens 2 is a negative lens, the third lens 3 is a positive lens, the fourth lens 4 is a negative lens, the fifth lens 5 is a negative lens, the sixth lens 6 is a negative lens, the seventh lens 7 is a positive lens, the eighth lens 8 is a positive lens; the ninth lens 9 is a negative lens, the tenth lens 10 is a positive lens, the eleventh lens 11 is a positive lens; the twelfth lens 12 is a positive lens, the thirteenth lens 13 is a negative lens, and the fourteenth lens 14 is a negative lens.

[0050] In summary, this embodiment, through the lens configuration described above, can better control the light path, improve edge image quality, and provide more uniform brightness and contrast.

[0051] Optionally, the first lens 1 is a meniscus lens that bends toward the image side, and the first radius of curvature of the first lens 1 and the second radius of curvature of the first lens 1 satisfy the relationship: 1<(L1 R2+L1 R1) / (L1 R2-L1 R1)<4.

[0052] Wherein, L1 R1 represents the first radius of curvature, and L1 R2 represents the second radius of curvature;

[0053] Wherein, the first radius of curvature is the radius of curvature of the object side surface of the first lens 1, and the second radius of curvature is the radius of curvature of the image side surface of the first lens 1.

[0054] In summary, the first lens 1 in this embodiment is a meniscus positive lens that bends towards the image side. Combined with the relationship of its radius of curvature, it can reduce spherical aberration and improve the sharpness of the central region while ensuring sufficient positive optical power.

[0055] Optionally, at least two lenses in the first lens group G1 have a dispersion coefficient greater than 64.

[0056] In summary, in this embodiment, at least two lenses in the first lens group G1 use low dispersion materials (dispersion coefficient greater than 64), which helps to significantly reduce chromatic aberration and improve color reproduction.

[0057] Optionally, the eighth lens 8 is a biconvex glass aspherical positive lens, and the dispersion coefficient of the eighth lens 8 is greater than 80.

[0058] In summary, the eighth lens 8 in this embodiment, as a biconvex glass aspherical positive lens, not only enhances positive optical power but also reduces aberrations, particularly coma and field curvature, through its aspherical properties. The choice of a material with a dispersion coefficient greater than 80 further reduces chromatic aberration and improves the overall image quality.

[0059] Optionally, the third radius of curvature of the eighth lens 8 and the fourth radius of curvature of the eighth lens 8 satisfy the following relationship: -3<(L8R2+L8R1) / (L8R2-L8R1)<1;

[0060] Wherein, L8R1 represents the third radius of curvature, and L8R2 represents the fourth radius of curvature;

[0061] Wherein, the third radius of curvature is the radius of curvature of the object side surface of the eighth lens 8, and the fourth radius of curvature is the radius of curvature of the image side surface of the eighth lens 8.

[0062] In summary, the curvature radius relationship of the eighth lens 8 in this embodiment ensures the effectiveness of the aspherical design, minimizing aberration effects while maintaining appropriate optical power. This improves the sharpness and clarity of image edges.

[0063] Optionally, the total effective focal length f of the camera lens and the focal length FG1 of the first lens group G1 satisfy the following relationship: 0.82 <FG1 / f<2.64。

[0064] In summary, this embodiment ensures that the lens maintains good imaging performance at different shooting distances, especially at the wide-angle end.

[0065] Optionally, the refractive index of each lens in the second lens group G2 is greater than 1.72.

[0066] In summary, each lens in the second lens group G2 of this embodiment has a refractive index greater than 1.72, which enables greater optical power adjustment within a smaller volume, thus helping to reduce lens size and weight.

[0067] Optionally, the total effective focal length f of the camera lens and the focal length FG2 of the second lens group G2 satisfy the following relationship: 2.17 <FG2 / f<4.18。

[0068] In summary, this embodiment ensures the flexibility and accuracy of the focus group when adjusting focus, supporting a smooth transition from close-up to telephoto.

[0069] Optionally, the total effective focal length f of the camera lens and the focal length FG3 of the third lens group G3 satisfy the relationship: |FG3 / f|>10.

[0070] In summary, the third lens group G3 in this embodiment has a strong negative optical power, which helps to correct any residual aberrations caused by the first two groups and ensures the imaging quality of the entire system.

[0071] In the specific implementation process, the radius of curvature, thickness, refractive index, and dispersion coefficient of each lens surface from the object side (the side of the photographed object) to the image side (the side of the image sensor or film) are shown in Table 1:

[0072]

[0073]

[0074] Table 1

[0075] Radius of curvature (mm): Indicates the degree of curvature of the lens surface. Positive values ​​represent convex surfaces, and negative values ​​represent concave surfaces.

[0076] Thickness (mm): refers to the distance between two adjacent surfaces, i.e., the thickness of the lens or air gap.

[0077] Refractive index: the ability of a material to bend light, used to calculate the change in direction of light as it passes through a lens.

[0078] Dispersion coefficient (Abbe number): A numerical value that describes the dispersion characteristics of a material. The larger the value, the smaller the color difference.

[0079] The aspherical coefficients of aspherical positive lenses are shown in Table 2:

[0080] Surface number 13 14 25 26 k -10.083 -0.308 -35.927 99 A4 9.478e-06 1.7906e-06 -1.645e-04 -1.006e-04 A6 -1.165e-07 -7.453e-08 1.250e-07 1.030e-07 A8 -5.075e-10 1.035e-09 -3.936e-09 2.408e-09 A10 9.200e-12 -8.936e-12 7.445-11 8.814e-13 A12 -4.134e-14 2.674e-14 -2.959e-13 -2.096e-14

[0081] Table 2

[0082] k: Conic constant, used to adjust the shape of aspherical surfaces.

[0083] A4, A6, A8, A10, A12: Higher-order aspherical coefficients, which affect the precise shape of the lens surface to optimize optical performance.

[0084] The specific values ​​of D1 and D2 in Table 1 at different focusing distances are shown in Table 3:

[0085] Conjugate distance Infinity Closest (0.2 m) D1 7.73 mm 4.37 mm D2 0.9 mm 4.26 mm

[0086] Table 3

[0087] Infinity: The dimensions of each distance when the lens is focused at infinity.

[0088] Closest (0.2m): The dimensions of each distance when the lens is focused at the closest working distance (e.g., 0.2 meters).

[0089] In summary, the key specifications of a 16mm focal length large aperture camera lens of this embodiment are shown in Table 4:

[0090] Focal length f 16.39 mm Relative aperture FNO. 1.46 Field of view angle ω 82.5° Optical total length 97 mm

[0091] Table 4

[0092] Figure 2 The spherical aberration curve provided for this embodiment of the utility model shows that, as can be seen from the figure, the three curves are close to zero in most aperture ranges, especially in the central region (aperture radius is close to 0). This indicates that the spherical aberration of the lens is very small in the central region, resulting in high image quality.

[0093] The spherical aberration curves for yellow light (588nm) and red light (656nm) are very close and remain at a low level throughout the aperture range, indicating that the lens performs very consistently at these wavelengths. This consistency helps reduce chromatic aberration and improve the color reproduction of the image.

[0094] Figure 3 The field curvature curve provided for this embodiment of the invention shows that, near the image center, both curves are very close to zero, indicating that the field curvature in the central region is very small. This means that the image quality in the central region is high, with almost no aberrations. Although the field curvature increases slightly in the edge regions (away from the center), it remains within a relatively small range (±0.5mm). This indicates that the lens design has also performed good correction in the edge regions, resulting in relatively uniform image quality across the entire field of view.

[0095] The meridional field curvature (S-curve) and tangential field curvature (T-curve) are relatively close throughout the entire field of view, especially in the central region. This indicates that the lens has good aberration control in different directions, reducing astigmatism.

[0096] Figure 4 The distortion curve provided for this embodiment of the utility model shows that the distortion is very small, almost non-existent, in the central region of the image. Even in the edge regions, the distortion is within a small range (±5%), ensuring the imaging quality of the entire field of view.

[0097] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A 16mm focal length, large aperture camera lens, characterized in that, include: A variable aperture, and a first lens group, a second lens group, and a third lens group arranged sequentially from the object side to the image side; The first lens group consists of eight lenses and serves as a fixed group for the camera lens, with positive optical power. The first lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side. The variable aperture is located between the first lens group and the second lens group; The second lens group consists of three lenses and serves as the focusing group of the camera lens, with positive optical power; the second lens group includes a ninth lens, a tenth lens, and an eleventh lens arranged sequentially from the object side to the image side; The third lens group consists of three lenses and serves as a fixed group of the camera lens, with a negative optical power; the third lens group includes a twelfth lens, a thirteenth lens, and a fourteenth lens arranged sequentially from the object side to the image side.

2. The 16mm focal length large aperture camera lens according to claim 1, characterized in that, The first lens is a positive lens, the second lens is a negative lens, the third lens is a positive lens, the fourth lens is a negative lens, the fifth lens is a negative lens, the sixth lens is a negative lens, the seventh lens is a positive lens, the eighth lens is a positive lens; the ninth lens is a negative lens, the tenth lens is a positive lens, the eleventh lens is a positive lens; the twelfth lens is a positive lens, the thirteenth lens is a negative lens, and the fourteenth lens is a negative lens.

3. A 16mm focal length, large aperture camera lens according to claim 1, characterized in that, The first lens is a meniscus positive lens that bends toward the image side, and the first radius of curvature of the first lens and the second radius of curvature of the first lens satisfy the relationship: 1<(L1 R2+L1 R1) / (L1 R2-L1 R1)<4; Wherein, L1 R1 represents the first radius of curvature, and L1 R2 represents the second radius of curvature; Wherein, the first radius of curvature is the radius of curvature of the object side of the first lens, and the second radius of curvature is the radius of curvature of the image side of the first lens.

4. A 16mm focal length, large aperture camera lens according to claim 1, characterized in that, At least two lenses in the first lens group have a dispersion coefficient greater than 64.

5. A 16mm focal length, large aperture camera lens according to claim 1, characterized in that, The eighth lens is a biconvex glass aspherical positive lens, and the dispersion coefficient of the eighth lens is greater than 80.

6. A 16mm focal length, large aperture camera lens according to claim 5, characterized in that, The third radius of curvature of the eighth lens and the fourth radius of curvature of the eighth lens satisfy the following relationship: -3<(L8R2+L8R1) / (L8R2-L8R1)<1; Wherein, L8R1 represents the third radius of curvature, and L8R2 represents the fourth radius of curvature; Wherein, the third radius of curvature is the radius of curvature of the object side surface of the eighth lens, and the fourth radius of curvature is the radius of curvature of the image side surface of the eighth lens.

7. A 16mm focal length, large aperture camera lens according to claim 1, characterized in that, The total effective focal length f of the camera lens and the focal length FG1 of the first lens group satisfy the following relationship: 0.82 <FG1 / f<2.64。 8. A 16mm focal length large aperture camera lens according to claim 1, characterized in that, The refractive index of each lens in the second lens group is greater than 1.

72.

9. A 16mm focal length large aperture camera lens according to claim 1, characterized in that, The total effective focal length f of the camera lens and the focal length FG2 of the second lens group satisfy the following relationship: 2.17 <FG2 / f<4.18。 10. A 16mm focal length, large aperture camera lens according to claim 1, characterized in that, The total effective focal length f of the camera lens and the focal length FG3 of the third lens group satisfy the following relationship: |FG3 / f|>10.

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