An interchangeable imaging lens and an image pickup apparatus

Abstract

The application provides a swappable imaging lens and a camera device. The swappable imaging lens comprises a first lens group, a second lens group and a third lens group arranged in sequence from an object side to an image side. The first lens group and the third lens group have positive refractive powers. The second lens group has a negative refractive power. The second lens group can move along the optical axis direction. The first lens group and the third lens group are fixed. The camera device comprises the above-mentioned swappable imaging lens and a camera element. The camera element is used to output a camera signal corresponding to an optical image formed by the swappable imaging lens. In the application, the first lens group and the third lens group with positive refractive powers and the second lens group with a negative refractive power are arranged to realize a lens design with high performance, miniaturization and light weight of the focusing group. The design not only improves the imaging quality of the lens, but also effectively corrects aberration, and meets the imaging requirements of a large-aperture optical lens under the trend of high pixelization.

Description

Technical Field

[0001] This application belongs to the field of optical technology, and more specifically, relates to an interchangeable imaging lens and a camera device. Background Technology

[0002] As mirrorless cameras are used for photography and video recording, the trend towards higher pixel counts places increasingly higher demands on the imaging capabilities of large-aperture optical lenses. High-performance lenses not only need to effectively correct spherical aberration, coma, astigmatism, and distortion, but also require correction of secondary spectral aberration in addition to primary chromatic aberration correction. Traditional domestic optical designs based on standard viewing angles generally use a double-Gaussian structure, but the inherent aberrations and image point shifts of the double-Gaussian structure mean that its imaging capabilities no longer meet the requirements of modern cameras. Furthermore, the focusing method of the double-Gaussian mechanism typically involves moving the entire lens group or the lens group behind the aperture stop, which results in excessive weight for the moving lens group, hindering autofocus. However, high-performance, miniaturized lenses with lightweight focusing groups still face challenges in design, such as difficulty in correcting aberrations, low performance, and high sensitivity leading to manufacturing difficulties. Utility Model Content

[0003] The purpose of this application is to provide an interchangeable imaging lens and a camera device to solve the technical problems of designing high-performance, miniaturized, and lightweight focusing lenses in the prior art.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows: an interchangeable imaging lens is provided, comprising a first lens group, a second lens group, and a third lens group arranged sequentially from the object side to the image side; the optical power of the first lens group is positive; the first lens group is fixed; the optical power of the second lens group is negative; the second lens group is movable along the optical axis; the optical power of the third lens group is positive; the third lens group is fixed.

[0005] Furthermore, the first lens group includes a first cemented lens, a first single lens, a second cemented lens, an aperture stop, and a second single lens arranged sequentially from the object side to the image side. The image plane side of the first cemented lens is concave; the optical power of the first single lens is positive; the object plane side of the second cemented lens is concave; and the optical power of the second single lens is positive.

[0006] Furthermore, the first cemented lens includes a first lens and a second lens arranged sequentially from the object side to the image side, wherein the optical power of the first lens is positive and the optical power of the second lens is negative;

[0007] The second cemented lens includes a third lens and a fourth lens arranged sequentially from the object side to the image side, wherein the optical power of the third lens is negative and the optical power of the fourth lens is positive.

[0008] Furthermore, the second lens group includes a third single lens and a fourth single lens arranged sequentially from the object side to the image side; the optical power of the third single lens is positive; the optical power of the fourth single lens is negative; wherein, at least one of the third single lens and the fourth single lens is an aspherical lens.

[0009] Furthermore, the third lens group includes a fifth single lens and a sixth single lens arranged sequentially from the object side to the image side; the optical power of the fifth single lens is positive; the optical power of the sixth single lens is negative; and the image side of the sixth single lens is concave.

[0010] Furthermore, the second cemented lens and the first single lens satisfy the following condition:

[0011] 1.5≦|fB12 / f1|≦3.2(1);

[0012] 1.5≦|fL13 / f1|≦4.5(2);

[0013] Wherein, fB12 is the focal distance of the second cemented lens; fL13 is the focal distance of the first single lens; and f1 is the focal distance of the first lens group.

[0014] Furthermore, the fourth lens, the second single lens, and the second lens group satisfy the following condition:

[0015] Vd1ave ≥ 57.6 (3);

[0016] Vd2ave ≤ 30 (4);

[0017] Wherein, Vd1ave is the average Abbe number of the fourth lens and the second single lens; Vd2ave is the average Abbe number of the second lens group.

[0018] Furthermore, the first lens group and the second lens group satisfy the following condition:

[0019] 0.8≦|f2 / f1|≦2.0(5);

[0020] Where f1 is the focal distance of the first lens group; and f2 is the focal distance of the second lens group.

[0021] Furthermore, the first lens group and the third lens group satisfy the following condition:

[0022] 1.0≦|f3 / f1|≦3.0(6);

[0023] Where f1 is the focal distance of the first lens group; and f3 is the focal distance of the third lens group.

[0024] This application also provides a camera device, including the above-described interchangeable imaging lens and camera element, wherein the camera element is used to output a camera signal corresponding to the optical image formed by the interchangeable imaging lens.

[0025] The advantages of the interchangeable imaging lens and camera device provided in this application are as follows: Compared with the prior art, this application achieves a high-performance, miniaturized, and lightweight lens design by setting a first lens group and a third lens group with positive optical power and a second lens group with negative optical power. This design not only improves the image quality of the lens but also effectively corrects aberrations, meeting the imaging requirements of large-aperture optical lenses under the trend of high pixel density. Simultaneously, the movable design of the second lens group makes the focusing process more flexible, facilitating autofocus and improving the efficiency of photography and video recording. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A schematic diagram of the interchangeable imaging lens provided in Embodiment 1 of this application at infinity;

[0028] Figure 2 This is a schematic diagram of the interchangeable imaging lens provided in Embodiment 1 of this application at a magnification of 0.025.

[0029] Figure 3 A schematic diagram of the interchangeable imaging lens provided in Embodiment 1 of this application at close range;

[0030] Figure 4 A schematic diagram of longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle at infinity for an interchangeable imaging lens provided in Embodiment 1 of this application;

[0031] Figure 5 A schematic diagram of longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle of the interchangeable imaging lens provided in Embodiment 1 of this application at a magnification of 0.025.

[0032] Figure 6 A schematic diagram of the longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle of the interchangeable imaging lens provided in Embodiment 1 of this application at near distances;

[0033] Figure 7This is a schematic diagram of the interchangeable imaging lens provided in Embodiment 2 of this application at infinity.

[0034] Figure 8 This is a schematic diagram of the interchangeable imaging lens provided in Embodiment 2 of this application at a magnification of 0.025.

[0035] Figure 9 This is a schematic diagram of the interchangeable imaging lens provided in Embodiment 2 of this application at close range;

[0036] Figure 10 This is a schematic diagram of the longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle of the interchangeable imaging lens provided in Embodiment 2 of this application at infinity.

[0037] Figure 11 This is a schematic diagram of the longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle of the interchangeable imaging lens provided in Embodiment 2 of this application at a magnification of 0.025.

[0038] Figure 12 This is a schematic diagram of the longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle of the interchangeable imaging lens provided in Embodiment 2 of this application at near distance.

[0039] The following are the labeling elements in the figure:

[0040] G1 - First lens group; B11 - First cemented lens; L11 - First lens; L12 - Second lens; L13 - First single lens; B12 - Second cemented lens; L14 - Third lens; L15 - Fourth lens; ST - Aperture stop; L16 - Second single lens;

[0041] G2 - Second lens group; L21 - Third single lens; L22 - Fourth single lens;

[0042] G3 - Third lens group; L31 - Fifth single lens; L32 - Sixth single lens. Detailed Implementation

[0043] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0044] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "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 application 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 application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] Please refer to the following: Figures 1 to 3 as well as Figures 7 to 9 The interchangeable imaging lens provided in this application embodiment will now be described. The interchangeable imaging lens includes 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; the first lens group G1 has a positive optical power and is fixed; the second lens group G2 has a negative optical power and is movable along the optical axis; the third lens group G3 has a positive optical power and is fixed.

[0048] The interchangeable imaging lens provided in this application, compared with the prior art, achieves a high-performance, miniaturized, and lightweight focusing group lens design by setting a first lens group and a third lens group with positive optical power and a second lens group with negative optical power. This design not only improves the image quality of the lens but also effectively corrects aberrations, meeting the imaging requirements of large-aperture optical lenses under the trend of high pixel density. Simultaneously, the movable design of the second lens group makes the focusing process more flexible, facilitating autofocus and improving the efficiency of photography and video recording.

[0049] In one embodiment of this application, please refer to the following: Figure 2 and Figure 8 The first lens group G1 includes a first cemented lens B11, a first single lens L13, a second cemented lens B12, an aperture ST, and a second single lens L16 arranged sequentially from the object side to the image side. The image plane side of the first cemented lens B11 is concave; the optical power of the first single lens L13 is positive; the object plane side of the second cemented lens B12 is concave; and the optical power of the second single lens L16 is positive.

[0050] In this embodiment, the design of the first cemented lens B11 and the second cemented lens B12 helps to further correct chromatic aberration and aberrations, improving the image quality of the lens. The first single lens L13 and the second single lens L16 enhance the lens's light transmission performance and further correct aberrations. The setting of the aperture stop ST helps to control the incident angle of light, further improving image quality.

[0051] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The first cemented lens B11 includes a first lens L11 and a second lens L12 arranged sequentially from the object side to the image side. The optical power of the first lens L11 is positive, and the optical power of the second lens L12 is negative. The second cemented lens B12 includes a third lens L14 and a fourth lens L15 arranged sequentially from the object side to the image side. The optical power of the third lens L14 is negative, and the optical power of the fourth lens L15 is positive.

[0052] In this embodiment, the combination of the first lens L11 and the second lens L12, as well as the combination of the third lens L14 and the fourth lens L15, effectively correct chromatic aberration and spherical aberration by matching positive and negative optical powers, thereby improving the lens's imaging performance. At the same time, this design also helps to reduce the size and weight of the lens, achieving miniaturization and weight reduction.

[0053] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The second lens group G2 includes a third single lens L21 and a fourth single lens L22 arranged sequentially from the object side to the image side; the optical power of the third single lens L21 is positive; the optical power of the fourth single lens L22 is negative; wherein, at least one of the third single lens L21 and the fourth single lens L22 is an aspherical lens.

[0054] The design of aspherical lenses helps to further correct aberrations, especially higher-order aberrations, thereby improving the image quality and resolution of the lens. Furthermore, the use of aspherical lenses can reduce the size and weight of the lens, making it more compact and lightweight. In the embodiments of this application, by rationally combining lenses with positive and negative optical powers and aspherical lenses, a high-performance, miniaturized, and lightweight focusing group lens design is achieved, meeting the imaging requirements of large-aperture optical lenses under the trend of high pixel density.

[0055] In this embodiment, the aspherical surface is defined according to the following formula:

[0056] z=CY2 / [1+{1-(1+k)c2Y2}1 / 2]+A4Y4+A6Y6+A8Y8+A10Y10···

[0057] Where z is the aspherical depth; c is the paraxial curvature (1 / r); Y is the height from the optical axis to the lens; K is the eccentricity; A4, A6, A8, A10... represent the aspherical coefficients of each order.

[0058] In one embodiment of this application, please refer to the following: Figure 1 and Figure 2 The third lens group G3 includes a fifth single lens L31 and a sixth single lens L32 arranged sequentially from the object side to the image side; the optical power of the fifth single lens L31 is positive; the optical power of the sixth single lens L32 is negative; and the image side of the sixth single lens L32 is concave.

[0059] In this embodiment, the combined design of the fifth single-lens element L31 and the sixth single-lens element L32 not only helps to further correct chromatic aberration and aberrations but also ensures the lens's high performance. In particular, the image-side surface of the sixth single-lens element L32 is designed to be concave, which helps to better guide light, reduce aberrations, and thus improve the lens's image sharpness and clarity. Furthermore, this design also helps to achieve lens miniaturization, making the entire lens system more compact and lightweight, and easier to carry and use.

[0060] In one embodiment of this application, the second cemented lens B12 and the first single lens L13 satisfy the following condition:

[0061] 1.5≦|fB12 / f1|≦3.2(1);

[0062] 1.5≦|fL13 / f1|≦4.5(2);

[0063] Wherein, fB12 is the focal distance of the second cemented lens B12; fL13 is the focal distance of the first single lens L13; and f1 is the focal distance of the first lens group G1.

[0064] Understandably, when condition (1) exceeds the upper limit, the optical power of the positive lenses (first lens L11, fourth lens L15, first single lens L13, and second single lens L16) weakens, which is detrimental to spherical aberration correction and lens miniaturization. When condition (1) exceeds the lower limit, the optical power of the positive lenses strengthens, which is beneficial for distortion correction, but it will cause large changes in coma and insufficient spherical aberration correction.

[0065] When condition (2) exceeds the upper limit, the optical power of the second cemented lens B12 weakens, resulting in insufficient spherical aberration compensation for the first lens group G1, and a deterioration in imaging performance. When condition (2) exceeds the lower limit, the optical power of the second cemented lens B12 strengthens, causing the aperture of the rear lens to increase, which is not conducive to lens miniaturization. At the same time, it generates a large positive spherical aberration, resulting in over-compensation of spherical aberration.

[0066] Therefore, when the second cemented lens B12 and the first single lens L13 satisfy conditions (1) and (2), by reasonably configuring the optical power of the first lens group G1 in front of the aperture stop, and by using different dispersed lens materials to form the first cemented lens B11 and the second cemented lens B12 symmetrically arranged, aberrations such as chromatic aberration, astigmatism, and distortion can be effectively reduced. This helps to balance the lens's chromatic aberration correction and aberration correction, so that the lens can effectively reduce aberrations and improve image quality while maintaining high definition.

[0067] In one embodiment of this application, the fourth lens L15, the second single lens L16, and the second lens group G2 satisfy the following condition:

[0068] Vd1ave ≥ 57.6 (3);

[0069] Vd2ave ≤ 30 (4);

[0070] Wherein, Vd1ave is the average Abbe number of the fourth lens L15 and the second single lens L16; Vd2ave is the average Abbe number of the second lens group G2.

[0071] In this embodiment, conditional expressions (3) and (4) are used to describe the selection of lens materials, particularly regarding the control of the Abbe number. The Abbe number is an important indicator for measuring the dispersion capability of lens materials and is crucial for correcting chromatic aberration. When the average Abbe number Vd1ave of the second cemented lens B12 and the second single lens L16 satisfies conditional expression (3), i.e., Vd1ave ≥ 57.6, it means that these lenses use high Abbe number materials, which helps reduce chromatic aberration and improve the image quality of the lens. At the same time, high Abbe number materials generally have better light transmission performance, which helps improve the overall light transmission efficiency of the lens.

[0072] When the average Abbe number Vd2ave of the second lens group G2 satisfies condition (4), i.e., Vd2ave≤30, it indicates that this lens group uses a material with a relatively low Abbe number. This design strategy can balance the lens's chromatic aberration correction and other aberration correction to a certain extent, because lens materials with different Abbe numbers have different characteristics in chromatic aberration correction. By reasonably matching high Abbe number and low Abbe number lens materials, various aberrations can be corrected more effectively, enabling the lens to exhibit excellent imaging performance under various shooting conditions.

[0073] In this embodiment, the materials of the second cemented lens B12, the second single lens L16, and the second lens group G2 are restricted by conditional formulas (3) and (4), which can effectively correct chromatic aberration, reduce secondary spectrum, control on-axis chromatic aberration and magnification chromatic aberration of the optical system, and achieve high-quality imaging.

[0074] In one embodiment of this application, the first lens group G1 and the second lens group G2 satisfy the following condition:

[0075] 0.8≦|f2 / f1|≦2.0(5);

[0076] Where f1 is the focal distance of the first lens group G1; and f2 is the focal distance of the second lens group G2.

[0077] When condition (5) exceeds the upper limit, the optical power of the second lens group G2 is weak, and the range of movement during focusing will increase, which is not conducive to lens miniaturization.

[0078] When condition (5) exceeds the lower limit, the optical power of the second lens group G2 becomes stronger, which will shorten the movement distance when the lens is focusing. However, this will cause larger fluctuations in coma and astigmatism, and the sensitivity during focusing movement will increase, which may not meet the driving accuracy requirements, resulting in focusing difficulties.

[0079] Specifically, condition (5) defines the proportional relationship between the focal distances of the first lens group G1 and the second lens group G2. This proportional relationship is crucial for the overall imaging performance and aberration correction of the lens. When the value of |f2 / f1| exceeds the upper limit of 2.0, the optical power of the second lens group G2 becomes too strong relative to the first lens group G1, which may cause large aberration changes during focusing, especially when the magnification changes, and the imaging performance may decrease significantly. Conversely, when the value of |f2 / f1| is below the lower limit of 0.8, the optical power of the second lens group G2 is relatively weak. Although this is beneficial for the miniaturization design of the lens, it may lead to insufficient aberration correction capability of the lens, especially in correcting higher-order aberrations and chromatic aberration, thereby affecting the imaging quality and resolution of the lens. Therefore, by satisfying condition (5), the optical power distribution between the first lens group G1 and the second lens group G2 can be ensured to be reasonable, which helps to balance the imaging performance and aberration correction capability of the lens, and achieve the lens design goals of high performance, miniaturization and lightweight focusing group.

[0080] In one embodiment of this application, the first lens group G1 and the third lens group G3 satisfy the following condition:

[0081] 1.0≦|f3 / f1|≦3.0(6);

[0082] Where f1 is the focal distance of the first lens group G1; and f3 is the focal distance of the third lens group G3.

[0083] When condition (6) exceeds the upper limit, the optical power of the third lens group G3 is relatively weak. Although it can effectively reduce the off-axis coma and astigmatism generated by the third lens group G3, it is insufficient for the aberration correction of the front lens group. In addition, the weaker optical power results in a longer intercept, which is not conducive to the miniaturization of the lens.

[0084] When condition (6) exceeds the lower limit, the optical power of the third lens group G3 is relatively strong, and the coma and image plane curvature become larger, which has an adverse effect on the imaging performance.

[0085] Specifically, condition (6) defines the proportional relationship between the focal distances of the first lens group G1 and the third lens group G3. This proportional relationship has a significant impact on the overall imaging performance and aberration correction of the lens. When the value of |f3 / f1| exceeds the upper limit of 3.0, the optical power of the third lens group G3 becomes too strong relative to the first lens group G1, which may lead to large aberrations in the lens during imaging, especially at the edge of the field of view, where the image quality may be significantly reduced. At the same time, the excessively strong optical power of the third lens group G3 may also lead to an increase in the overall size of the lens, which is not conducive to achieving the miniaturization design of the lens. Conversely, when the value of |f3 / f1| is below the lower limit of 1.0, the optical power of the third lens group G3 is relatively weak. Although this helps to reduce the size and weight of the lens, it may lead to insufficient ability of the lens to correct aberrations, especially in correcting higher-order aberrations and chromatic aberration, thereby affecting the image quality and resolution of the lens. Therefore, by satisfying condition (6), it can be ensured that the optical power distribution between the first lens group G1 and the third lens group G3 is reasonable, which helps to balance the imaging performance and aberration correction capability of the lens, and further achieve the lens design goals of high performance, miniaturization and lightweight focusing group.

[0086] In summary, this application achieves a high-performance, miniaturized, and lightweight focusing group lens design through meticulously designed lens groups and condition-specific power allocation. This design not only improves the lens's image quality but also effectively corrects aberrations, meeting the imaging requirements of large-aperture optical lenses in the trend towards higher pixel counts. Furthermore, this design makes the lens more stable during zooming and focusing, improving the efficiency of photography and video recording.

[0087] This application also provides a camera device (not shown), which includes the above-mentioned interchangeable imaging lens and camera element, wherein the camera element is used to output a camera signal corresponding to the optical image formed by the interchangeable imaging lens.

[0088] In this embodiment, the camera device achieves high-performance imaging by incorporating the interchangeable imaging lens provided in this application. The imaging element accurately captures the optical image formed by the lens and converts it into a high-quality video signal, thereby meeting various shooting needs. Whether for professional photography or everyday shooting, this camera device provides excellent imaging performance, bringing users a clearer, more detailed, and more realistic visual experience. Furthermore, due to the miniaturization and lightweight design of the lens, this camera device also possesses portability and ease of use, allowing users to shoot anytime, anywhere.

[0089] Example 1

[0090] In this embodiment, the parameters of each lens are shown in Table 1.

[0091] Table 1

[0092]

[0093] In this embodiment, the interchangeable imaging lens has a focal length f = 44, an aperture coefficient FNO = 1.85, and a field of view 2ω = 35°. The parameter correspondences at infinity, at 0.025 magnification, and at near distance are shown in Table 2. Schematic diagrams of longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle at infinity, 0.025 magnification, and at near distance are shown below. Figure 4 , Figure 5 as well as Figure 6 As shown in the figure, regardless of the focusing position, the interchangeable imaging lens of this embodiment exhibits good imaging performance, with low aberrations and distortion, ensuring high-quality imaging results.

[0094] Specifically Figure 4 This diagram illustrates the longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle at infinity in this embodiment. As can be seen from the diagram, when focusing at infinity, the lens effectively controls the longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle, ensuring image sharpness and accuracy. Similarly, Figure 5 and Figure 6 The imaging performance of Example 1 at 0.025 magnification and at near magnification is shown respectively, both demonstrating good aberration correction effect and imaging quality.

[0095] Table 2:

[0096]

[0097] In this embodiment, the second single lens L16 and the fourth single lens L22 are aspherical lenses, and their parameters, defined according to the aspherical formula, are shown in Table 3. This design strategy not only optimizes the lens's imaging performance but also ensures that the lens maintains excellent performance under various shooting conditions. The application of aspherical lenses further enhances the lens's aberration correction capabilities, resulting in clearer and more detailed images.

[0098] Table 3

[0099]

[0100] In this embodiment, the optical power of each lens element is shown in Table 4. The data in Table 4 provides a more intuitive understanding of the role each lens element plays in the lens design. The optical power of each lens element not only determines its ability to refract light but also directly affects the overall imaging performance and aberration correction of the lens. During the design process, by precisely calculating and adjusting the optical power of each lens element, it is possible to ensure that the lens maintains excellent image quality under various shooting conditions.

[0101] Table 4 shows the optical power distribution of each lens element. This not only reflects the complexity of the lens design but also highlights the designer's efforts in balancing imaging performance and aberration correction. Through reasonable optical power allocation, the lens can effectively reduce aberrations and improve image quality while maintaining high sharpness.

[0102] Table 4:

[0103]

[0104] In this embodiment, the calculation structure of the conditional expressions is shown in Table 5. The setting and verification of these conditional expressions ensure that the lens design process can fully balance the correction of various aberrations, while simultaneously achieving lens miniaturization and weight reduction. Through precise calculation and optimization, the optical power and material selection of each lens element are precisely controlled within a certain range, thereby ensuring the overall imaging performance of the lens.

[0105] Table 5

[0106]

[0107]

[0108] Example 2

[0109] In this embodiment, the parameters of each lens are shown in Table 6. Similar to Embodiment 1, this embodiment also achieves a high-performance, miniaturized, and lightweight focusing group lens design through carefully designed lens groups and optical power allocation that meets specific conditions. The specific parameters of each lens are listed in detail in Table 6. The selection of these parameters aims to optimize the lens's imaging performance and aberration correction capabilities.

[0110] Unlike Embodiment 1, this embodiment features fine-tuning in lens material and power distribution to adapt to different shooting needs and scenarios. By adjusting the power of each lens and selecting appropriate materials, the lens in this embodiment maintains high definition and low aberrations while further enhancing its adaptability and flexibility.

[0111] Table 6 lists the parameters of each lens in this embodiment, including radius of curvature, center thickness, refractive index, and Abbe number. The selection and design of these parameters are based on in-depth optical theory and rich practical experience, aiming to achieve the best imaging effect of the lens.

[0112] Table 6:

[0113]

[0114]

[0115] In this embodiment, the interchangeable imaging lens has a focal length f = 36, an aperture coefficient FNO = 1.85, and a field of view 2ω = 43°. The parameter correspondences at infinity, at 0.025 magnification, and at near distance are shown in Table 7. Schematic diagrams of longitudinal spherical aberration, astigmatic field curvature angle, and distortion angle at infinity, 0.025 magnification, and at near distance are shown below. Figures 10 to 12 As shown. Figure 10 , Figure 11 as well as Figure 12 The imaging performance at different focus positions was also demonstrated. Similar to Embodiment 1, the interchangeable imaging lens of Embodiment 2 exhibited excellent imaging performance at all focus positions, with low aberrations and distortion, meeting the requirements for high-quality imaging.

[0116] Table 7:

[0117]

[0118] In this embodiment, the second single lens L16 and the fourth single lens L22 are aspherical lenses, and their parameters, defined according to the aspherical formula, are shown in Table 8. The selection of these aspherical parameters aims to further optimize the lens's imaging performance, particularly in controlling aberrations and improving image sharpness. Through aspherical design, the lens can better correct spherical aberration, coma, and other aberrations, thereby providing excellent image quality under various shooting conditions. The data in Table 8 demonstrates the specific parameters of the aspherical lenses; the selection and design of these parameters are based on in-depth optical theory and rich practical experience.

[0119] Table 8

[0120]

[0121] In this embodiment, the optical power of each lens is shown in Table 9. The data in Table 9 clearly shows the specific role each lens plays in the lens design. The lenses in the first and second lens groups, through precise optical power allocation, effectively control various aberrations, ensuring the lens's image sharpness.

[0122] Table 9:

[0123]

[0124] In this embodiment, the calculation structure of the conditional expressions is shown in Table 10. The rigorous setting and verification process of these conditional expressions not only reflects the scientific rigor and precision of the lens design but also ensures that the final lens product can meet various complex shooting requirements. By continuously adjusting and optimizing the optical power, material, and aspherical parameters of the lens elements, the designer successfully achieved a perfect combination of miniaturization, lightweight design, and high performance. Furthermore, the data in Table 10 also shows the specific calculation results of each conditional expression in Embodiment 2, which further verify the rationality and effectiveness of the lens design.

[0125] Table 10

[0126]

[0127] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An interchangeable imaging lens, characterized in that, Including those arranged sequentially from the object side to the image side: The first lens group (G1) has a positive optical power; the first lens group (G1) is fixed in place. The second lens group (G2) has a negative optical power; the second lens group (G2) can move along the optical axis. as well as The third lens group (G3) has a positive optical power; the third lens group (G3) is fixed in place. The first lens group (G1) includes a first cemented lens (B11), a first single lens (L13), a second cemented lens (B12), an aperture stop (ST), and a second single lens (L16) arranged sequentially from the object side to the image side; the image side of the first cemented lens (B11) is concave; the optical power of the first single lens (L13) is positive; the object side of the second cemented lens (B12) is concave; and the optical power of the second single lens (L16) is positive.

2. The interchangeable imaging lens as described in claim 1, characterized in that, The first cemented lens (B11) includes a first lens (L11) and a second lens (L12) arranged sequentially from the object side to the image side. The optical power of the first lens (L11) is positive, and the optical power of the second lens (L12) is negative. The second cemented lens (B12) includes a third lens (L14) and a fourth lens (L15) arranged sequentially from the object side to the image side. The third lens (L14) has a negative optical power, and the fourth lens (L15) has a positive optical power.

3. The interchangeable imaging lens as described in claim 1, characterized in that, The second lens group (G2) includes the following components arranged sequentially from the object side to the image side: The third single lens (L21) has a positive optical power; and The fourth single lens (L22) has a negative optical power; Among them, at least one of the third single lens (L21) and the fourth single lens (L22) is an aspherical lens.

4. The interchangeable imaging lens as described in claim 1, characterized in that, The third lens group (G3) includes lenses arranged sequentially from the object side to the image side: The fifth single lens (L31), wherein the optical power of the fifth single lens (L31) is positive; and The sixth single lens (L32) has a negative optical power and its image side is concave.

5. The interchangeable imaging lens as described in claim 1, characterized in that, The second cemented lens (B12) and the first single lens (L13) satisfy the following condition: 1.5≦|fB12 / f1|≦3.2(1); 1.5≦|fL13 / f1|≦4.5(2); Wherein, fB12 is the focal distance of the second cemented lens (B12); fL13 is the focal distance of the first single lens (L13); and f1 is the focal distance of the first lens group (G1).

6. The interchangeable imaging lens as described in claim 2, characterized in that, The fourth lens (L15), the second single lens (L16), and the second lens group (G2) satisfy the following condition: Vd1ave ≥ 57.6(3); Vd2ave ≤ 30(4); Wherein, Vd1ave is the average Abbe number of the fourth lens (L15) and the second single lens (L16); Vd2ave is the average Abbe number of the second lens group (G2).

7. The interchangeable imaging lens as described in claim 1, characterized in that, The first lens group (G1) and the second lens group (G2) satisfy the following condition: 0.8≦|f2 / f1|≦2.0(5); Where f1 is the focal distance of the first lens group (G1); and f2 is the focal distance of the second lens group (G2).

8. The interchangeable imaging lens as described in any one of claims 1-7, characterized in that, The first lens group (G1) and the third lens group (G3) satisfy the following condition: 1.0≦|f3 / f1|≦3.0 (6); Wherein, f1 is the focal distance of the first lens group (G1); f3 is the focal distance of the third lens group (G3).

9. A camera device, characterized in that, include: Interchangeable imaging lens as described in any one of claims 1-8; and A camera element, the camera element being used to output a camera signal corresponding to the optical image formed by the interchangeable imaging lens.

Images