A compact camera lens
By employing a compact camera lens design, a specific lens combination, and high-refractive-index optical glass, the problems of large size and weight of high-specification camera lenses have been solved, resulting in a compact camera lens that is both portable and produces high image quality, enhancing shooting flexibility and imaging effects.
Patent Information
- Application Number
- CN202522396347.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-11-12
AI Technical Summary
High-specification camera lenses are bulky and heavy, causing photographer fatigue and inconvenience in carrying them, limiting the flexibility of shooting scenarios and ordinary shooting needs.
It employs a compact camera lens design, including a specific lens combination and high-refractive-index optical glass, maintains a maximum aperture of F1.7, shortens the lens body length and reduces weight, uses a combination of negative and positive lenses, increases the optical power ratio of the moving group, and reduces chromatic aberration and chromatic fringing.
It achieves portability and high image quality in a compact camera lens, reducing the length and weight of the lens body, while maintaining excellent imaging performance at infinity and close-up distances, with true-to-life colors.
Smart Images
Figure CN224682469U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of camera lens technology, and in particular to a compact camera lens. Background Technology
[0002] High-specification camera lenses, in pursuit of ultimate optical specifications and performance, often employ complex lens group structures, resulting in a large lens body and significantly increased weight. This bulk not only increases the photographer's burden, leading to fatigue during extended handheld shooting, but also limits the flexibility of shooting scenarios when using a tripod. Furthermore, the excessive size increases the burden of carrying, requiring a dedicated camera bag for outdoor shooting, which is inconvenient for ordinary shooting needs such as recording everyday life, street photography, and travel photography. Utility Model Content
[0003] The purpose of this invention is to provide a compact camera lens to solve the aforementioned technical problems.
[0004] The technical solution of this utility model is implemented as follows: A compact camera lens includes: a first lens, a first cemented lens group, a second cemented lens group, a variable aperture, a third cemented lens group, an eighth lens with positive optical power, a fourth cemented lens group, and an eleventh lens with negative optical power, arranged sequentially from the object side to the imaging plane; wherein the first cemented lens group is formed by combining the second and third lenses, the second cemented lens group is formed by combining the fourth and fifth lenses, the third cemented lens group is formed by combining the sixth and seventh lenses, and the fourth cemented lens group is formed by combining the ninth and tenth lenses.
[0005] Optionally, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens constitute a first lens group, which is a fixed group with positive optical power; the sixth lens and the seventh lens constitute a second lens group, which is a movable group with negative optical power; and the eighth lens, the ninth lens, the tenth lens, and the eleventh lens constitute a third lens group, which is a fixed group with positive optical power.
[0006] Alternatively, the relationship between the length of a compact camera lens and its maximum image height satisfies the following condition: TTL / Ymax < 6, where TTL is the total length from the vertex of the first lens surface to the image plane, and Ymax is the maximum paraxial image height at infinity.
[0007] Optionally, the first lens is a spherical positive lens convex to the object side, which satisfies the following condition: F1 / Ymax < 3; PgF1+0.0017vd1 > 0.58; Where F1 is the focal length of the first lens; Ymax is the maximum paraxial image height at infinity; PgF1 is the partial dispersion of the first lens about the g and F lines; and vd1 is the Abbe number of the first lens.
[0008] Optionally, the second lens and the third lens are combined to form a cemented doublet lens, wherein the second lens and the third lens satisfy the following conditions: vd2 > 75; 1.6 < |F2 / F3| < 2; Where, vd2: Abbe number of the second lens; F2: focal length of the second lens in air; F3: focal length of the third lens in air.
[0009] Optionally, the fourth and fifth lenses are combined to form a cemented doublet lens, wherein the fourth and fifth lenses satisfy the following conditions: Vd4 > 75; 0.2 < |F4 / F5| < 1.2; Wherein, Vd4: Abbe number of the fourth lens; F4: focal length of the fourth lens in air; F5: focal length of the fifth lens in air.
[0010] Optionally, the second lens group includes a third cemented lens group consisting of a sixth lens and a seventh lens, satisfying the following conditions: nd6 > 1.86; 0.5 < |FG3 / f| < 1.5; Wherein, nd6: the refractive index of the sixth lens about the d-line (587nm); FG3: the focal length of the third cemented lens group; f: the focal length of the optical system.
[0011] Optionally, the eighth lens is a spherical positive lens convex to the object side, which satisfies the following condition: F8 / f < 0.8; Where F8 is the focal length of the eighth lens, and f is the focal length of the optical system.
[0012] Optionally, the eleventh lens is a meniscus negative lens that bends towards the object side, satisfying the following conditions: -1.4 < F11 / f < -0.7; Where F11 is the focal length of the last lens, and f is the focal length of the optical system.
[0013] The beneficial effects of this utility model are: This utility model provides a compact camera lens that employs high-refractive-index optical glass and a compact lens group arrangement. While maintaining a maximum aperture of F1.7, it shortens the lens body length and reduces weight, achieving true portability while ensuring image quality. The optical power ratio of the moving group is increased, thereby reducing the travel of the moving group and further shortening the overall lens length. The moving group uses a combination of negative and positive lenses, resulting in excellent imaging at infinity and close distances. The use of ultra-low dispersion and anomalous dispersion materials effectively reduces chromatic aberration and color fringing, restoring true colors to the image. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic diagram of the structure of the compact camera lens described in the embodiment; Figure 2 The spherical aberration curve is shown in the embodiment. Figure 3 The field curvature curve diagram described in the embodiment; Figure 4 The distortion curve is shown in the embodiment.
[0016] Icon labels: 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; STP-Variable aperture; G1-First lens group; G2-Second lens group; G3-Third lens group. Detailed Implementation
[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0019] Example 1:
[0020] like Figure 1 As shown, this embodiment provides a compact camera lens, including: a first lens, a first cemented lens group, a second cemented lens group, a variable aperture, a third cemented lens group, an eighth lens with positive optical power, a fourth cemented lens group, and an eleventh lens with negative optical power arranged sequentially from the object side to the imaging plane; wherein, the first cemented lens group is formed by combining the second and third lenses, the second cemented lens group is formed by combining the fourth and fifth lenses, the third cemented lens group is formed by combining the sixth and seventh lenses, and the fourth cemented lens group is formed by combining the ninth and tenth lenses.
[0021] Secondly, the first lens, second lens, third lens, fourth lens and fifth lens described in this embodiment constitute the first lens group, which is a fixed group with positive optical power; the sixth lens and seventh lens constitute the second lens group, which is a movable group with negative optical power; the eighth lens, ninth lens, tenth lens and eleventh lens constitute the third lens group, which is a fixed group with positive optical power.
[0022] Secondly, the relationship between the length of the compact camera lens and the maximum image height described in this embodiment satisfies the following condition: TTL / Ymax < 6, where TTL is the total length from the vertex of the first lens surface to the image plane, and Ymax is the maximum paraxial image height at infinity.
[0023] Secondly, in this embodiment, the first lens is a spherical positive lens convex to the object side, which satisfies the following conditions: F1 / Ymax < 3; PgF1+0.0017vd1 > 0.58; Where F1 is the focal length of the first lens; Ymax is the maximum paraxial image height at infinity; PgF1 is the partial dispersion of the first lens about the g and F lines; and vd1 is the Abbe number of the first lens.
[0024] Secondly, in this embodiment, the second lens and the third lens are combined to form a cemented doublet lens, and the second lens and the third lens satisfy the following conditions: vd2 > 75; 1.6 < |F2 / F3| < 2; Where, vd2: Abbe number of the second lens; F2: focal length of the second lens in air; F3: focal length of the third lens in air.
[0025] Secondly, in this embodiment, the fourth lens and the fifth lens are combined to form a cemented doublet lens, and the fourth lens and the fifth lens satisfy the following conditions: Vd4 > 75; 0.2 < |F4 / F5| < 1.2; Wherein, Vd4: Abbe number of the fourth lens; F4: focal length of the fourth lens in air; F5: focal length of the fifth lens in air.
[0026] Secondly, in this embodiment, the second lens group includes a third cemented lens group composed of a sixth lens and a seventh lens, satisfying the following conditions: nd6 > 1.86; 0.5 < |FG3 / f| < 1.5; Wherein, nd6: the refractive index of the sixth lens about the d-line (587nm); FG3: the focal length of the third cemented lens group; f: the focal length of the optical system.
[0027] Secondly, in this embodiment, the eighth lens is a spherical positive lens convex to the object side, which satisfies the following conditions: F8 / f < 0.8; Where F8 is the focal length of the eighth lens, and f is the focal length of the optical system.
[0028] Secondly, in this embodiment, the eleventh lens is a meniscus negative lens that bends towards the object side, satisfying the following conditions: -1.4 < F11 / f < -0.7; Where F11 is the focal length of the last lens, and f is the focal length of the optical system.
[0029] This embodiment provides a compact camera lens that employs high-refractive-index optical glass and a compact lens group arrangement. While maintaining a maximum aperture of F1.7, it shortens the lens body length and reduces weight, achieving true portability while ensuring image quality. The optical power ratio of the moving group is increased, thereby reducing the travel of the moving group and further shortening the overall lens length. The moving group uses a combination of negative and positive lenses, resulting in excellent imaging at infinity and close distances. The use of ultra-low dispersion and anomalous dispersion materials effectively reduces chromatic aberration and color fringing, restoring true colors to the image.
[0030] Secondly, 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: Table 1 1 52.21 4.99 1.7292 54.685 2 300 0.15 3 28.185 6 1.497 81.605 4 -358 1.2 1.6134 44.107 5 19.76 1.6 6 20.926 6.7 1.497 81.605 7 -90 1.2 1.6074 56.655 8 188 3.66 9 Infinity D1 10 -95.768 2.2 1.9229 20.88 11 -49.346 1.05 1.5174 52.149 12 21.420 D2 13 39.215 4.18 1.6516 58.403 14 -62.327 0.1 15 50.408 5.92 1.717 47.889 16 -19.894 1.2 1.5481 45.82 17 32.487 5.1 18 -17.737 1.2 1.9229 20.88 19 -25.776 10.2 20 Infinity 1.5 1.5168 64.199 21 Infinity 2 22 Radius of curvature (mm): Indicates the degree of curvature of the lens surface. Positive values represent convex surfaces, and negative values represent concave surfaces.
[0031] Thickness (mm): refers to the distance between two adjacent surfaces, i.e., the thickness of the lens or air gap.
[0032] 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.
[0033] Dispersion coefficient (Abbe number): A numerical value that describes the dispersion characteristics of a material. The larger the value, the smaller the color difference.
[0034] The specific values of D1 and D2 in Table 1 at different focusing distances are shown in Table 2: Table 2 D1 3.5mm 10.4mm D2 9.85mm 2.95mm Infinity: The dimensions of each distance when the lens is focused at infinity.
[0035] Closest (0.55m): The dimensions of each distance when the lens is focused at the closest working distance.
[0036] In summary, the key specifications of a compact camera lens in this embodiment are shown in Table 3: Table 3 Relative aperture FNO. 1.78 Field of view ω 27.79° Overall optical length 73.5mm like Figure 2 The figure shows a spherical aberration curve of a compact camera lens according to this embodiment, where the horizontal axis represents spherical aberration and the vertical axis represents the normalized entrance pupil. As can be seen from the figure, the spherical aberration of the three different wavelengths of light converges to a very small range, allowing the lens to obtain a clear and transparent image.
[0037] like Figure 3 The figure shows the field curvature curve of a compact camera lens according to this embodiment, where the horizontal axis represents the field curvature, the vertical axis represents the image height, the T-line represents the meridional direction, and the S-line represents the sagittal direction. As can be seen from the figure, the image can be imaged on the same plane across the entire frame without any local blurring. Furthermore, the small distance between the meridional and sagittal curves indicates uniform image formation in different directions.
[0038] like Figure 4 The figure shows the distortion curve of a compact camera lens according to this embodiment, where the horizontal axis represents distortion and the vertical axis represents image height. As can be seen from the figure, the distortion is controlled below 2.5% across the entire frame.
[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A compact camera lens, characterized in that, include: The first lens, the first cemented lens group, the second cemented lens group, the variable aperture, the third cemented lens group, the eighth lens with positive optical power, the fourth cemented lens group, and the eleventh lens with negative optical power are arranged sequentially from the object side to the imaging plane. The first cemented lens group is formed by combining the second and third lenses, the second cemented lens group is formed by combining the fourth and fifth lenses, the third cemented lens group is formed by combining the sixth and seventh lenses, and the fourth cemented lens group is formed by combining the ninth and tenth lenses.
2. A compact camera lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, and the fifth lens constitute the first lens group, which is a fixed group with positive optical power; the sixth lens and the seventh lens constitute the second lens group, which is a movable group with negative optical power; the eighth lens, the ninth lens, the tenth lens, and the eleventh lens constitute the third lens group, which is a fixed group with positive optical power.
3. A compact camera lens according to claim 2, characterized in that, The relationship between the length of a compact camera lens and its maximum image height satisfies the following condition: TTL / Ymax < 6, where TTL is the total length from the vertex of the first lens surface to the image plane, and Ymax is the maximum paraxial image height at infinity.
4. A compact camera lens according to claim 2, characterized in that, The first lens is a spherical positive lens convex to the object side, which satisfies the following condition: F1 / Ymax < 3; PgF1+0.0017vd1 > 0.58; Where F1 is the focal length of the first lens; Ymax is the maximum paraxial image height at infinity; PgF1 is the partial dispersion of the first lens about the g and F lines; and vd1 is the Abbe number of the first lens.
5. A compact camera lens according to claim 2, characterized in that, The second and third lenses are combined to form a cemented doublet lens, and the second and third lenses satisfy the following conditions: vd2 > 75; 1.6 < |F2 / F3| < 2; Where, vd2: Abbe number of the second lens; F2: focal length of the second lens in air; F3: focal length of the third lens in air.
6. A compact camera lens according to claim 2, characterized in that, The fourth and fifth lenses are combined to form a cemented doublet lens, and the fourth and fifth lenses satisfy the following conditions: Vd4 > 75; 0.2 < |F4 / F5| < 1.2; Wherein, Vd4: Abbe number of the fourth lens; F4: focal length of the fourth lens in air; F5: focal length of the fifth lens in air.
7. A compact camera lens according to claim 2, characterized in that, The second lens group includes a third cemented lens group consisting of a sixth lens and a seventh lens, satisfying the following condition: nd6 > 1.86; 0.5 < |FG3 / f| < 1.5; Wherein, nd6: the refractive index of the sixth lens about the d-line (587nm); FG3: the focal length of the third cemented lens group; f: the focal length of the optical system.
8. A compact camera lens according to claim 2, characterized in that, The eighth lens is a spherical positive lens convex to the object side, and it satisfies the following conditions: F8 / f < 0.8; Where F8 is the focal length of the eighth lens, and f is the focal length of the optical system.
9. A compact camera lens according to claim 2, characterized in that, The eleventh lens is a meniscus negative lens that curves towards the object side, and satisfies the following conditions: -1.4 < F11 / f < -0.7; Where F11 is the focal length of the last lens, and f is the focal length of the optical system.