Wide-angle fixed-focus photographic lens and photographic device

Abstract

The invention discloses a wide-angle fixed-focus photographic lens and a photographic device. The lens sequentially comprises a first lens group with positive focal power, an aperture diaphragm, a second lens group with positive focal power and a third lens group with negative focal power from an object side to an image side, in the focusing process, the first lens group, the second lens group and the third lens group move towards the object side along the optical axis. The first lens group, the second lens group and the third lens group satisfy the following conditional expressions: F1 / F is greater than or equal to 1 and less than or equal to 1.5 (1); 1.5 < = F2 / F < = 3 (2); f3 / F < =-4, (3); wherein F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the focal length of the photographic lens. The wide-angle fixed-focus photographic lens provided by the technical scheme of the invention is favorable for optimizing the optical performance and the focusing mechanism of the lens and simplifying the design and manufacturing.

Description

Technical Field

[0001] This application relates to the field of camera technology, and in particular to a wide-angle fixed-focus camera lens and camera device. Background Technology

[0002] In recent years, mirrorless cameras have gradually replaced DSLR cameras in the photography market, becoming the mainstream. Compared with traditional DSLR cameras, mirrorless cameras have a smaller size and a shorter flange focal distance. Thanks to the shorter flange focal distance, mirrorless camera lenses have greater freedom in optical design, allowing for the design of smaller, higher-resolution camera lenses.

[0003] Currently, wide-angle lenses on the market generally suffer from drawbacks such as large size, heavy weight, and poor portability in order to achieve high image quality.

[0004] Therefore, it is necessary to improve existing wide-angle photography lenses. Summary of the Invention

[0005] This application provides a wide-angle fixed-focus photographic lens and photographic device, which aims to solve the problems of existing wide-angle photographic lenses being large in size and having unsatisfactory imaging effects.

[0006] To achieve the above objectives, this application provides a wide-angle fixed-focus photographic lens, which, from the object side to the image side, sequentially includes a first lens group with positive optical power, an aperture stop, a second lens group with positive optical power, and a third lens group with negative optical power; during focusing, the first lens group, the second lens group, and the third lens group move along the optical axis toward the object side;

[0007] The first lens group, the second lens group, and the third lens group satisfy the following condition:

[0008] 1≤F1 / F≤1.5, (1);

[0009] 1.5≤F2 / F≤3, (2);

[0010] F3 / F≤-4, (3);

[0011] Where F1 represents the combined focal length of the first lens group, F2 represents the combined focal length of the second lens group, F3 represents the combined focal length of the third lens group, and F represents the focal length of the camera lens.

[0012] In some embodiments, the first lens group includes at least one lens with negative optical power and one lens with positive optical power;

[0013] Among them, the lens with negative optical power is placed closer to the object side, the lens with positive optical power is placed closer to the image side, and the refractive index Nd of the lens with positive optical power is ≥1.75.

[0014] In some embodiments, the first lens group includes at least one aspherical lens.

[0015] In some embodiments, the first lens group includes, from the object side to the image side, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, and a fourth lens with positive optical power.

[0016] The first lens is an aspherical lens; the refractive index of the third lens is Nd3≥1.75; and the refractive index of the fourth lens is Nd4≥1.80.

[0017] In some embodiments, the first lens group includes, from the object side to the image side, a first lens having negative optical power and a fourth lens having positive optical power.

[0018] The fourth lens is an aspherical lens with a refractive index Nd4 ≥ 1.80.

[0019] In some embodiments, the second lens and the third lens are combined to form a first cemented lens.

[0020] In some embodiments, the first lens group includes, from the object side to the image side, a first lens having negative optical power and a fourth lens having positive optical power.

[0021] The first lens is an aspherical lens, and the refractive index of the fourth lens is Nd4≥1.80.

[0022] In some embodiments, the second lens group is a cemented lens.

[0023] In some embodiments, the second lens group includes, from the object side to the image side, a sixth lens with positive optical power and a seventh lens with negative optical power.

[0024] The sixth lens and the seventh lens are combined to form a second cemented lens.

[0025] In some embodiments, the sixth lens and the seventh lens satisfy the following condition:

[0026] |Vd6-Vd7|≥15,(4);

[0027] Wherein, Vd6 is the Abbe number of the sixth lens in the second lens group with respect to light with a wavelength of 587.6 nm; Vd7 is the Abbe number of the seventh lens in the second lens group with respect to light with a wavelength of 587.6 nm.

[0028] In some embodiments, the second lens group includes, from the object side to the image side, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power.

[0029] The fifth lens, the sixth lens, and the seventh lens are combined to form the third cemented lens.

[0030] In some embodiments, the third lens group includes at least one lens with negative optical power that bends toward the object side and one lens with positive optical power that bends toward the object side.

[0031] Among them, the lens with negative optical power is placed closer to the object side, the lens with positive optical power is placed closer to the image side, and the refractive index Nd of the lens with positive optical power is ≥1.80.

[0032] In some embodiments, the third lens group includes at least one aspherical lens.

[0033] In some embodiments, the third lens group includes, from the object side to the image side, a ninth lens with negative optical power and a tenth lens with positive optical power.

[0034] The ninth lens and the tenth lens are both aspherical lenses that are bent toward the object side, and the refractive index of the tenth lens is Nd10≥1.80.

[0035] In some embodiments, the third lens group includes, from the object side to the image side, an eighth lens with negative optical power, a ninth lens with negative optical power, and a tenth lens with positive optical power.

[0036] The eighth lens is an aspherical lens, and the refractive index Nd10 of the tenth lens is ≥1.80; the eighth lens, the ninth lens, and the tenth lens are all bent towards the object side.

[0037] This application also provides a photographic apparatus, which includes an image sensor and a wide-angle fixed-focus photographic lens as described above, wherein the image sensor is detachably connected to the wide-angle fixed-focus photographic lens.

[0038] This application proposes a wide-angle fixed-focus photographic lens. The wide-angle fixed-focus photographic lens, from the object side to the image side, includes a first lens group with positive optical power, an aperture stop, a second lens group with positive optical power, and a third lens group with negative optical power. During focusing, the first lens group, the second lens group, and the third lens group move along the optical axis toward the object side. The first lens group, the second lens group, and the third lens group satisfy the following conditions: 1≤F1 / F≤1.5, (1); 1.5≤F2 / F≤3, (2); F3 / F≤-4, (3); where F1 represents the combined focal length of the first lens group, F2 represents the combined focal length of the second lens group, F3 represents the combined focal length of the third lens group, and F represents the focal length of the photographic lens. This application's technical solution forms a wide-angle fixed-focus photographic lens through a reasonable combination of lens groups, and further provides the relationship between the focal length of each lens group and the focal length of the entire photographic lens. This design helps to optimize the lens's optical performance, focusing mechanism, and simplify design and manufacturing. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, 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, wherein:

[0040] Figure 1 This diagram illustrates the structure of Embodiment 1 of this application;

[0041] Figure 2 This diagram illustrates spherical aberration in embodiment 1 of this application when focusing at infinity.

[0042] Figure 3 This diagram illustrates the field curvature and distortion of Embodiment 1 of this application when focused at infinity;

[0043] Figure 4 This diagram illustrates spherical aberration at the closest focusing distance in Embodiment 1 of this application.

[0044] Figure 5 This diagram illustrates the field curvature and distortion at the closest focusing distance in Embodiment 1 of this application.

[0045] Figure 6 This document shows a schematic diagram of the structure of Embodiment 2 of this application;

[0046] Figure 7 This diagram illustrates spherical aberration in embodiment 2 of this application when focusing at infinity.

[0047] Figure 8This diagram illustrates the field curvature and distortion of Embodiment 2 of this application when focused at infinity;

[0048] Figure 9 This diagram illustrates spherical aberration at the closest focusing distance in Embodiment 2 of this application.

[0049] Figure 10 This diagram illustrates the field curvature and distortion at the closest focusing distance in Embodiment 2 of this application.

[0050] Figure 11 This diagram illustrates the structure of Embodiment 3 of this application;

[0051] Figure 12 This diagram illustrates spherical aberration in embodiment 3 of this application when focusing at infinity.

[0052] Figure 13 This diagram illustrates the field curvature and distortion of Embodiment 3 of this application when focused at infinity;

[0053] Figure 14 This diagram illustrates spherical aberration at the closest focusing distance in Embodiment 3 of this application.

[0054] Figure 15 This diagram illustrates the field curvature and distortion at the closest focusing distance in Embodiment 3 of this application. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0056] See Figure 1 As shown, this application provides a wide-angle fixed-focus photographic lens. The wide-angle fixed-focus photographic lens, from the object side to the image side, sequentially includes a first lens group G1 with positive optical power, an aperture stop STP, a second lens group G2 with positive optical power, and a third lens group G3 with negative optical power. During focusing, the first lens group G1, the second lens group G2, and the third lens group G3 move along the optical axis toward the object side. The first lens group G1, the second lens group G2, and the third lens group G3 satisfy the following conditional expression:

[0057] 1≤F1 / F≤1.5, (1);

[0058] 1.5≤F2 / F≤3, (2);

[0059] F3 / F≤-4, (3);

[0060] Where F1 represents the combined focal length of the first lens group G1, F2 represents the combined focal length of the second lens group G2, F3 represents the combined focal length of the third lens group G3, and F represents the focal length of the camera lens.

[0061] The photographic lens provided in this application comprises, from the object side to the image side, a first lens group G1 with positive optical power, an aperture stop STP, a second lens group G2 with positive optical power, and a third lens group G3 with negative optical power. This allows for effective control of light refraction and focusing as light passes through each lens group, thereby achieving high-quality imaging.

[0062] During the focusing process, all lens groups move along the optical axis toward the object, allowing the lens to quickly and accurately adjust the focal length to adapt to different shooting distances. Furthermore, because the lens groups work collaboratively during focusing, the overall stability of the lens is improved, reducing shake and errors caused by moving a single lens group individually.

[0063] Three further conditional expressions are given to define the relationship between the combined focal length of the first lens group G1, the second lens group G2, and the third lens group G3 and the focal length of the entire photographic lens. Specifically:

[0064] Condition (1) gives the ratio of the composite focal length F1 of the first lens group G1 to the focal length F of the entire lens as being between 1 and 1.5. Since the ratio is close to 1, the first lens group G1 plays the main focusing role in the lens, and its focal length is close to the focal length of the entire lens.

[0065] Condition (2) gives the ratio of the combined focal length F2 of the second lens group G2 to the focal length F of the entire lens as being between 1.5 and 3. Compared to the first lens group G1, the second lens group G2 has a longer focal length, but it is still a positive focal length, thus playing a role in assisting focusing and correcting aberrations in the lens.

[0066] Condition (3) states that the combined focal length F3 of the third lens group G3 is a negative focal length, and its absolute value is at least 4 times the focal length F of the entire lens. The negative focal length of the third lens group G3 has a diverging effect, which can be used in wide-angle lenses to expand the angle of view and correct aberrations such as distortion.

[0067] Although the lens contains three lens groups, the reasonable focal length ratio and compact design of each lens group enable the lens to be miniaturized and lightweight, making it convenient for long-term handheld shooting or travel.

[0068] In some embodiments, the first lens group G1 includes at least one lens with negative optical power and one lens with positive optical power; wherein the lens with negative optical power is disposed near the object side, the lens with positive optical power is disposed near the image side, and the refractive index Nd of the lens with positive optical power is ≥1.75.

[0069] In this embodiment, a lens with negative optical power is positioned close to the object side. The negative optical power lens can diffuse light, thereby increasing the field of view of the lens, expanding the lens's angle of view, and enabling the wide-angle lens to capture more scene information.

[0070] A lens with positive optical power is positioned close to the image side to refocus the light rays that have diverged through the negative optical power lens to form a clear image. This ensures that the light rays are effectively controlled after passing through the first lens group G1, reducing aberrations and distortions.

[0071] Therefore, the first lens group G1 combines the advantages of negative and positive power lenses, enabling it to provide high-quality imaging while maintaining a wide field of view.

[0072] Further, lenses with positive optical power are made of high refractive index materials (Nd≥1.75). These high refractive index lenses can refract light more effectively, thereby reducing the required lens thickness and weight, which helps to design compact, lightweight lenses and improve the optical performance of the lenses.

[0073] In some embodiments, the first lens group G1 includes at least one aspherical lens.

[0074] Aspherical lenses can optimize the refraction path of light, reduce aberrations such as spherical aberration and coma, and improve edge imaging quality. This allows for a reduction in the number of other lenses required while maintaining the field of view, simplifying the lens structure and reducing the lens size.

[0075] In this embodiment, an aspherical lens is introduced into the first lens group G1. Based on the characteristics of the aspherical lens, precise control and correction can be performed at the beginning of the light entering the optical system, laying a good foundation for the subsequent imaging process.

[0076] In some embodiments, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative optical power, a second lens L02 with negative optical power, a third lens L03 with positive optical power, and a fourth lens L04 with positive optical power; wherein, the first lens L01 is an aspherical lens; the refractive index Nd3 of the third lens L03 is ≥1.75, and the refractive index Nd4 of the fourth lens L04 is ≥1.80.

[0077] In this embodiment, a specific structural configuration of the first lens group G1 is proposed.

[0078] First, placing the first lens L01 and the second lens L02, both with negative optical power, closer to the object widens the lens's angle of view, enabling wide-angle shooting. Simultaneously, the aspherical design of the first lens L01 more effectively controls distortion, especially barrel distortion, which is common in wide-angle shooting, thus providing a more realistic and natural image.

[0079] Secondly, both the third lens L03 and the fourth lens L04 are made of high refractive index material (Nd≥1.75). High refractive index lenses can reduce the thickness and weight of the lens, making the lens more compact and lightweight, and more effectively refracting light, thus improving the optical performance of the lens, including resolution, contrast and color reproduction.

[0080] In summary, the first lens group G1, through the above-mentioned optical power allocation and lens arrangement, can reduce imaging defects such as aberrations and chromatic aberrations, thereby improving the image quality of the lens. In particular, the combined use of aspherical lenses and high-refractive-index lenses enables the lens to provide clear, sharp, and color-accurate images while maintaining a wide field of view.

[0081] In some embodiments, the second lens L02 and the third lens L03 are combined to form a first cemented lens.

[0082] A cemented lens is an optical element formed by gluing together multiple transparent units (usually thin lenses).

[0083] In this embodiment, by combining the second lens L02 and the third lens L03, the optical power can be allocated more flexibly to balance the overall optical power distribution of the lens, enabling the lens to maintain good imaging performance at different field of view angles. Furthermore, since the second lens L02 and the third lens L03 are integrated into a single unit, a relatively stable overall structure is formed, which improves the lens's shock resistance and stability, and significantly reduces the lens's size and weight.

[0084] In some embodiments, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative optical power and a fourth lens L04 with positive optical power; wherein, the first lens L01 is an aspherical lens and the refractive index Nd4 of the fourth lens L04 is ≥1.80.

[0085] In this embodiment, the design of the first lens group G1 is simplified to include only a first lens L01 with negative optical power and a fourth lens L04 with positive optical power.

[0086] This configuration simplifies the lens structure, reducing manufacturing costs and complexity. It also reduces the lens's size and weight, making it more portable and easy to carry. Despite having fewer lenses, high image quality can still be achieved through the combination of aspherical and high-refractive-index lenses. The aspherical lenses reduce aberrations and distortion, while the high-refractive-index lenses improve light refraction efficiency.

[0087] In some embodiments, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative optical power and a fourth lens L04 with positive optical power; wherein, the fourth lens L04 is an aspherical lens and the refractive index Nd4 of the fourth lens L04 is ≥1.80.

[0088] In this embodiment, another specific structural configuration of the first lens group G1 is proposed. Specifically, the fourth lens L04 is designed as an aspherical lens, which can also reduce the lens size while maintaining the field of view, and further help correct light and improve image quality.

[0089] In some embodiments, the second lens group G2 is a cemented lens.

[0090] In this way, by setting the second lens group G2 as a cemented lens, chromatic aberration of the lens at different wavelengths can be significantly reduced, improving image quality; and a more optimized optical power distribution can be achieved to meet specific imaging requirements, as well as reduce the size and weight of the lens and lower manufacturing costs.

[0091] In some embodiments, the second lens group G2 includes a sixth lens L06 with positive optical power and a seventh lens L07 with negative optical power sequentially from the object side to the image side; wherein the sixth lens L06 and the seventh lens L07 are combined to form a second cemented lens.

[0092] This embodiment proposes a specific structural configuration for the second lens group G2. It includes two lenses: a sixth lens L06 with positive optical power and a seventh lens L07 with negative optical power. This greatly simplifies the structure of the second lens group G2 and improves the image quality of the lens through the cooperation of the sixth lens L06 and the seventh lens L07.

[0093] Furthermore, the sixth lens L06 and the seventh lens L07 satisfy the following conditional expression:

[0094] |Vd6-Vd7|≥15,(4);

[0095] Wherein, Vd6 is the Abbe number of the sixth lens L06 in the second lens group G2 with respect to light with a wavelength of 587.6nm; Vd7 is the Abbe number of the seventh lens L07 in the second lens group G2 with respect to light with a wavelength of 587.6nm.

[0096] Therefore, the difference (absolute value) in the Abbe number between the sixth lens L06 and the seventh lens L07 must be greater than or equal to 15. By using lenses with high and low Abbe numbers in combination, axial chromatic aberration in the lens can be effectively corrected. The chromatic dispersion characteristics of different lens materials can be complemented. By selecting a suitable combination of lens materials, the focal length variation of the entire lens system under different colors of light can be optimized, thereby reducing chromatic dispersion and improving image quality.

[0097] In some embodiments, the second lens group G2 includes, from the object side to the image side, a fifth lens L05 with negative optical power, a sixth lens L06 with positive optical power, and a seventh lens L07 with negative optical power; wherein the fifth lens L05, the sixth lens L06, and the seventh lens L07 are combined to form a third cemented lens.

[0098] This embodiment further adds a fifth lens L05 with negative optical power. The addition of the fifth lens L05 helps to achieve a wider shooting angle, and working together with the third cemented lens, it can more effectively correct chromatic aberration. Furthermore, by precisely controlling the curvature, thickness, and spacing of each lens, aberrations such as spherical aberration, coma, and astigmatism can be further reduced, improving the image quality of the lens.

[0099] In some embodiments, the third lens group G3 includes at least one lens with negative optical power that bends toward the object side and one lens with positive optical power that bends toward the object side; wherein the lens with negative optical power is disposed near the object side, the lens with positive optical power is disposed near the image side, and the refractive index Nd of the lens with positive optical power is ≥1.80.

[0100] In this embodiment, the structure of the third lens group G3 is similar to that of the first lens group G1, and it can achieve the function of the first lens group G1, which will not be described in detail here.

[0101] In some embodiments, the third lens group G3 includes at least one aspherical lens. This improves the imaging quality and performance of the optical system. By precisely designing and optimizing the position, arrangement, and optical characteristics of the aspherical lens, effective correction of various aberrations can be achieved, improving the resolution and sharpness of the optical system. Furthermore, the use of aspherical lenses helps reduce the number of lenses required for the third lens group G3, thereby lowering costs.

[0102] In some embodiments, the third lens group G3 includes, from the object side to the image side, a ninth lens L09 with negative optical power and a tenth lens L10 with positive optical power; wherein, the ninth lens L09 and the tenth lens L10 are both aspherical lenses bent toward the object side, and the refractive index Nd10 of the tenth lens L10 is ≥1.80.

[0103] In this embodiment, a specific structural configuration of the third lens L03 is proposed.

[0104] The ninth lens, L09, a meniscus concave aspherical lens, significantly reduces distortion caused by wide-angle lenses, while the tenth lens, L10, a meniscus convex aspherical lens, effectively corrects spherical aberration, resulting in excellent image quality. Furthermore, the combination of these two aspherical lenses further enhances image quality, ensuring high sharpness and contrast. In addition, the tenth lens, L10, uses a high refractive index material (Nd10 ≥ 1.80), which allows for a reduction in lens thickness while maintaining or improving image quality.

[0105] In some embodiments, the third lens group G3 includes, from the object side to the image side, an eighth lens L08 with negative optical power, a ninth lens L09 with negative optical power, and a tenth lens L10 with positive optical power; wherein, the eighth lens L08 is an aspherical lens, and the refractive index Nd10 of the tenth lens L10 is ≥1.80; the eighth lens L08, the ninth lens L09, and the tenth lens L10 are all bent towards the object side.

[0106] This embodiment proposes another specific structural configuration for the third lens group G3. It comprehensively considers multiple aspects, including lens combination, the use of aspherical lenses, the application of high-refractive-index materials, and the bending direction of the lenses. The aim is also to improve the imaging quality and performance of the optical system while maintaining the lens's compactness and portability.

[0107] In this application, a parallel glass plate GL configured as a filter is arranged between the last lens of the third lens group G3 and the image plane IMG. The function of the parallel glass plate GL is to filter light to improve image quality. Specifically, the parallel glass plate GL can absorb or reflect certain wavelengths of light to eliminate or reduce interference factors such as chromatic aberration and stray light, thereby improving image contrast and sharpness.

[0108] Example 1

[0109] Figure 1 The diagram shown is a structural schematic of the wide-angle fixed-focus photographic lens of Embodiment 1. Figure 1As shown, in this embodiment, the first lens group G1, from the object side to the image side, sequentially includes a first lens L01 with negative optical power, a second lens L02 with negative optical power, a third lens L03 with positive optical power, and a fourth lens L04 with positive optical power; wherein, the first lens L01 is an aspherical lens with a refractive index Nd1 = 1.68; the third lens L03 has a refractive index Nd3 = 2.001, and the fourth lens L04 has a refractive index Nd4 = 1.816; the second lens L02 and the third lens L03 are combined to form a first cemented lens. The second lens group G2, from the object side to the image side, sequentially includes a sixth lens L06 with positive optical power and a seventh lens L07 with negative optical power; wherein, the sixth lens L06 and the seventh lens L07 are combined to form a second cemented lens; the Abbe number Vd6 of the sixth lens L06 is 51.16, and the Abbe number Vd7 of the seventh lens L07 is 35.71. The third lens group G3 includes, from the object side to the image side, a ninth lens L09 with negative optical power and a tenth lens L10 with positive optical power; wherein, the ninth lens L09 and the tenth lens L10 are both non-surface lenses and are bent towards the object side, the refractive index of the ninth lens L09 is Nd9 = 1.6873, and the refractive index of the tenth lens L10 is Nd10 = 1.8088.

[0110] In this embodiment, the numerical data of the wide-angle fixed-focus photographic lens are shown in Tables 1-3:

[0111] Table 1

[0112]

[0113]

[0114] Table 2

[0115]

[0116] Table 3

[0117]

[0118]

[0119] The surface number indicates the surface number of each lens from the object side to the image side.

[0120] In Embodiment 1, the object-side and image-side surfaces of the first lens L01, the seventh lens L07, and the eighth lens L08 are set as aspherical surfaces. The fourth, sixth, eighth, and tenth order aspherical coefficients A4, A6, A8, A10, and A12, along with the conic constant k, are shown in the table below.

[0121] The definition of aspherical shape is explained here, and the definition of aspherical shape will not be repeated in other embodiments:

[0122]

[0123] Where y is the radial coordinate starting from the optical axis. z is the offset in the optical axis direction starting from the intersection point of the aspheric surface and the optical axis. r is the radius of curvature of the reference sphere of the aspheric surface. k is the aspheric coefficient of the 4th, 6th, 8th, 10th, and 12th orders.

[0124] Figure 2 and Figure 3 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 1 when focused at infinity. Figure 4 and Figure 5 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 1 when in focus at the closest distance.

[0125] The spherical aberration curve represents the spherical aberration curve at an aperture of f / 2.88. The F, D, and C lines represent spherical aberrations at wavelengths of 486 nm, 587 nm, and 656 nm, respectively. The horizontal axis represents the magnitude of the spherical aberration, and the vertical axis represents the field of view. For focusing at no distance, the field curvature curve represents the field curvature curve at a half-field angle ω of 40.4°. The dashed line S represents the value of the principal ray D on the sagittal image plane, and the solid line T represents the value of the principal ray D on the meridional image plane. The horizontal axis represents the magnitude of the field curvature, and the vertical axis represents the field of view. The distortion curve represents the distortion curve at a half-field angle ω of 40.4°. The horizontal axis represents the distortion value, and the vertical axis represents various spherical aberrations, field curvature, and distortion curves related to the field of view. At the closest focusing distance, the field curvature curve represents the field curvature curve at a half-field angle ω of 36.4°. The dashed line S represents the value of the principal ray D on the sagittal image plane, and the solid line T represents the value of the principal ray D on the meridional image plane. The horizontal axis represents the magnitude of the field curvature value, and the vertical axis represents the field of view. The distortion curve represents the distortion curve at a half-field angle ω of 36.4°. The horizontal axis represents the distortion value, and the vertical axis represents the field of view.

[0126] As can be seen from Figures 2-5, the camera lens of this embodiment 1 has good imaging effect.

[0127] Example 2

[0128] Figure 6 The diagram shown is a structural schematic of the wide-angle fixed-focus photographic lens of Embodiment 2. Figure 6As shown, in this embodiment, the first lens group G1, from the object side to the image side, includes a first lens L01 with negative optical power and a fourth lens L04 with positive optical power; wherein, the first lens L01 is an aspherical lens with a refractive index Nd1 = 1.5833; and the fourth lens L04 has a refractive index Nd3 = 1.835. The second lens group G2, from the object side to the image side, includes a fifth lens L05 with negative optical power, a sixth lens L06 with positive optical power, and a seventh lens L07 with negative optical power; wherein, the fifth lens L05, the sixth lens L06, and the seventh lens L07 are combined to form a third cemented lens; the Abbe number Vd6 of the sixth lens L06 is 52.32, and the Abbe number Vd7 of the seventh lens L07 is 35.02. The third lens group G3 includes, from the object side to the image side, an eighth lens L08 with negative optical power, a ninth lens L09 with negative optical power, and a tenth lens L10 with positive optical power; wherein, the eighth lens L08 is an aspherical lens, and the refractive index of the tenth lens L10 is Nd10 = 2.001; the eighth lens L08, the ninth lens L09, and the tenth lens L10 are all bent towards the object side.

[0129] In this embodiment, the numerical data of the wide-angle fixed-focus photographic lens are shown in Tables 4-6:

[0130] Table 4

[0131]

[0132]

[0133] Table 5

[0134]

[0135] Table 6

[0136]

[0137] Figure 7 and Figure 8 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 2 when focused at infinity. Figure 9 and Figure 10 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 2 when in focus at the closest distance.

[0138] Figure 2 and Figure 3 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 1 when focused at infinity. Figure 4 and Figure 5 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 1 when in focus at the closest distance.

[0139] The spherical aberration curve represents the spherical aberration curve at an aperture of f / 2.88. The F, D, and C lines represent spherical aberrations at wavelengths of 486 nm, 587 nm, and 656 nm, respectively. The horizontal axis represents the magnitude of the spherical aberration, and the vertical axis represents the field of view. For focusing at no distance, the field curvature curve represents the field curvature curve at a half-field angle ω of 40.5°. The dashed line S represents the value of the principal ray D on the sagittal image plane, and the solid line T represents the value of the principal ray D on the meridional image plane. The horizontal axis represents the magnitude of the field curvature, and the vertical axis represents the field of view. The distortion curve represents the distortion curve at a half-field angle ω of 40.5°. The horizontal axis represents the distortion value, and the vertical axis represents various spherical aberrations, field curvature, and distortion curves related to the field of view. At the closest focusing distance, the field curvature curve represents the field curvature curve at a half-field angle ω of 36.3°. The dashed line S represents the value of the principal ray D on the sagittal image plane, and the solid line T represents the value of the principal ray D on the meridional image plane. The horizontal axis represents the magnitude of the field curvature value, and the vertical axis represents the field of view. The distortion curve represents the distortion curve at a half-field angle ω of 36.3°. The horizontal axis represents the distortion value, and the vertical axis represents the field of view.

[0140] As can be seen from Figures 7-10, the camera lens of this embodiment 2 has good imaging effect.

[0141] Example 3

[0142] Figure 11 The diagram shown is a structural schematic of the wide-angle fixed-focus photographic lens of Embodiment 3. Figure 11 As shown, in this embodiment, the first lens group G1, from the object side to the image side, includes a first lens L01 with negative optical power and a fourth lens L04 with positive optical power; wherein, the fourth lens L04L01 is an aspherical lens with a refractive index Nd4 = 1.8088. The second lens group G2, from the object side to the image side, includes a fifth lens L05 with negative optical power, a sixth lens L06 with positive optical power, and a seventh lens L07 with negative optical power; wherein, the fifth lens L05, the sixth lens L06, and the seventh lens L07 are combined to form a third cemented lens; the Abbe number Vd6 of the sixth lens L06 is 52.32, and the Abbe number Vd7 of the seventh lens L07 is 36.34. The third lens group G3 includes, from the object side to the image side, a ninth lens L09 with negative optical power and a tenth lens L10 with positive optical power; wherein, the refractive index of the ninth lens L09 is Nd9 = 1.8088, the refractive index of the tenth lens L10 is Nd10 = 1.8088, and both the ninth lens L09 and the tenth lens L10 are non-surface lenses and are bent towards the object side.

[0143] In this embodiment, the numerical data of the wide-angle fixed-focus photographic lens are shown in Tables 7-9:

[0144] Table 7

[0145] Face number face shape radius of curvature R thickness Refractive index Nd Abbe number Vd Object endless endless endless 1 spherical -27.13 0.8 1.6200 36.34 2 spherical 17.34 0.91 3 aspherical 14.09 3.3 1.8088 40.97 4 aspherical -30.76 3.4 STP spherical 0.81 6 spherical endless 0.8 1.6034 38.01 7 spherical 8.64 4.71 1.7550 52.32 8 spherical -10.71 0.8 1.6200 36.34 9 spherical 33.30 4.42 10 aspherical -7.45 1.2 1.8088 40.97 11 aspherical -9.34 0.67 12 aspherical -67.25 4.67 1.8088 40.97 13 aspherical -34.25 D1 14 spherical endless 2.5 1.5168 64.198 15 spherical endless 1 IMAGE endless

[0146] Table 8

[0147]

[0148]

[0149] Table 9

[0150] Face number k A4 A6 A8 A10 A12 3 0 -6.06e-5 -2.05e-7 -1.42e-8 -5.09e-10 -6.85e-12 4 0 8.07-e6 -4.87e-7 1.45e-8 -2.3e-10 -5.6e-11 10 0 3.70e-5 2.60e-5 -6.31e-7 9.20e-9 -1.98e-11 11 0 1.85e-4 1.62e-5 -1.83e-7 -2.39e-10 3.74e-12 12 0 1.22e-6 5.75e-7 -2.72e-9 -1.72e-11 7.52e-14 13 0 -4.36e-5 -1.87e-7 2.62e-9 -2.39e-12 -5.00e-14

[0151] Figure 12 and Figure 13 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 3 when focused at infinity. Figure 14 and Figure 15 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 3 when in focus at the closest distance.

[0152] Figure 2 and Figure 3 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 1 when focused at infinity. Figure 4 and Figure 5 The diagram shows the spherical aberration, field curvature, and distortion curves of Example 1 when in focus at the closest distance.

[0153] The spherical aberration curve represents the spherical aberration curve at an aperture of f / 2.88. The F, D, and C lines represent spherical aberrations at wavelengths of 486 nm, 587 nm, and 656 nm, respectively. The horizontal axis represents the magnitude of the spherical aberration, and the vertical axis represents the field of view. For focusing at no distance, the field curvature curve represents the field curvature curve at a half-field angle ω of 40.6°. The dashed line S represents the value of the principal ray D in the sagittal image plane, and the solid line T represents the value of the principal ray D in the meridional image plane. The horizontal axis represents the magnitude of the field curvature, and the vertical axis represents the field of view. The distortion curve represents the distortion curve at a half-field angle ω of 40.6°. The horizontal axis represents the distortion value, and the vertical axis represents various spherical aberrations, field curvature, and distortion curves related to the field of view. At the closest focusing distance, the field curvature curve represents the field curvature curve at a half-field angle ω of 36.4°. The dashed line S represents the value of the principal ray D on the sagittal image plane, and the solid line T represents the value of the principal ray D on the meridional image plane. The horizontal axis represents the magnitude of the field curvature value, and the vertical axis represents the field of view. The distortion curve represents the distortion curve at a half-field angle ω of 36.4°. The horizontal axis represents the distortion value, and the vertical axis represents the field of view.

[0154] As can be seen from Figures 12-15, the camera lens of this embodiment 3 has good imaging effect.

[0155] This application also provides a photographic apparatus. The photographic apparatus includes an image sensor and a wide-angle fixed-focus photographic lens as described above, the image sensor and the wide-angle fixed-focus photographic lens being detachably connected. The image sensor is a camera.

[0156] In this embodiment, the photographic device includes all the technical solutions of all the embodiments of the wide-angle fixed-focus photographic lens described above, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0157] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A wide-angle fixed-focus photographic lens, characterized in that, From the object side to the image side, it includes, in sequence, a first lens group with positive optical power, an aperture stop, a second lens group with positive optical power, and a third lens group with negative optical power; During the focusing process, the first lens group, the second lens group, and the third lens group move along the optical axis toward the object side; The first lens group, the second lens group, and the third lens group satisfy the following condition: 1≤F1 / F≤1.5, (1); 1.5≤F2 / F≤3, (2); F3 / F≤-4, (3); Where F1 represents the combined focal length of the first lens group, F2 represents the combined focal length of the second lens group, F3 represents the combined focal length of the third lens group, and F represents the focal length of the camera lens.

2. The wide-angle fixed-focus photographic lens according to claim 1, characterized in that, The first lens group includes at least one lens with negative optical power and one lens with positive optical power; Among them, the lens with negative optical power is placed closer to the object side, the lens with positive optical power is placed closer to the image side, and the refractive index Nd of the lens with positive optical power is ≥1.

75.

3. The wide-angle fixed-focus photographic lens according to claim 2, characterized in that, The first lens group includes at least one aspherical lens.

4. The wide-angle fixed-focus photographic lens according to claim 3, characterized in that, The first lens group includes, from the object side to the image side, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, and a fourth lens with positive optical power. The first lens is an aspherical lens; the refractive index of the third lens is Nd3≥1.75; and the refractive index of the fourth lens is Nd4≥1.

80.

5. The wide-angle fixed-focus photographic lens according to claim 4, characterized in that, The second lens and the third lens are combined to form a first cemented lens.

6. The wide-angle fixed-focus photographic lens according to claim 3, characterized in that, The first lens group includes, from the object side to the image side, a first lens with negative optical power and a fourth lens with positive optical power. The first lens is an aspherical lens, and the refractive index of the fourth lens is Nd4≥1.

80.

7. The wide-angle fixed-focus photographic lens according to claim 3, characterized in that, The first lens group includes, from the object side to the image side, a first lens with negative optical power and a fourth lens with positive optical power. The fourth lens is an aspherical lens with a refractive index Nd4 ≥ 1.

80.

8. The wide-angle fixed-focus photographic lens according to any one of claims 1 to 7, characterized in that, The second lens group is a cemented lens.

9. The wide-angle fixed-focus photographic lens according to claim 8, characterized in that, The second lens group includes, from the object side to the image side, a sixth lens with positive optical power and a seventh lens with negative optical power. The sixth lens and the seventh lens are combined to form a second cemented lens.

10. The wide-angle fixed-focus photographic lens according to claim 9, characterized in that, The sixth lens and the seventh lens satisfy the following condition: |Vd6-Vd7|≥15,(4); Wherein, Vd6 is the Abbe number of the sixth lens in the second lens group with respect to light with a wavelength of 587.6 nm; Vd7 is the Abbe number of the seventh lens in the second lens group with respect to light with a wavelength of 587.6 nm.

11. The wide-angle fixed-focus photographic lens according to claim 8, characterized in that, The second lens group includes, from the object side to the image side, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power. The fifth lens, the sixth lens, and the seventh lens are combined to form the third cemented lens.

12. The wide-angle fixed-focus photographic lens according to any one of claims 1 to 7, characterized in that, The third lens group includes at least one lens with negative optical power that bends toward the object side and one lens with positive optical power that bends toward the object side. Among them, the lens with negative optical power is placed closer to the object side, the lens with positive optical power is placed closer to the image side, and the refractive index Nd of the lens with positive optical power is ≥1.

80.

13. The wide-angle fixed-focus photographic lens according to claim 12, characterized in that, The third lens group includes at least one aspherical lens.

14. The wide-angle fixed-focus photographic lens according to claim 13, characterized in that, The third lens group includes, from the object side to the image side, a ninth lens with negative optical power and a tenth lens with positive optical power. The ninth lens and the tenth lens are both aspherical lenses that are bent toward the object side, and the refractive index of the tenth lens is Nd10≥1.

80.

15. The wide-angle fixed-focus photographic lens according to claim 13, characterized in that, The third lens group, from the object side to the image side, includes an eighth lens with negative optical power, a ninth lens with negative optical power, and a tenth lens with positive optical power. The eighth lens is an aspherical lens, and the refractive index Nd10 of the tenth lens is ≥1.80; the eighth lens, the ninth lens, and the tenth lens are all bent towards the object side.

16. A photographic apparatus, characterized in that, It includes an image sensor and a wide-angle fixed-focus photographic lens as described in any one of claims 1-15, wherein the image sensor is detachably connected to the wide-angle fixed-focus photographic lens.

Images