Compact internal focusing wide-angle photographic lens and photographic device

Abstract

The invention discloses a compact internal focusing wide-angle 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 second lens group moves along the optical axis, and the first lens group and the third lens group remain unchanged relative to the position of the image plane. The first lens group, the second lens group and the third lens group satisfy the following conditional expressions: 1.5 < = F1 / F < = 3.5; 1 < = F2 / F < = 2; -3 < = F3 / F < =-1; 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 compact internal focusing type wide-angle photographic lens provided by the technical scheme of the invention is beneficial to optimizing the optical performance of the lens, simplifying the focusing mechanism and simplifying the design and manufacturing.

Description

Technical Field

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

[0002] In recent years, the demand for mirrorless cameras has been expanding rapidly in the photography market. Compared with the large size and poor portability of DSLR cameras, mirrorless cameras are smaller, lighter and more portable due to the elimination of the reflex mirror assembly. At the same time, thanks to the continuous development and maturity of high-precision CMOS chips, the resolution of cameras is also increasing day by day, enabling mirrorless cameras to have excellent high-quality imaging.

[0003] Currently, in order to achieve high image quality, interchangeable wide-angle lenses on the market generally suffer from problems such as large size, heavy weight, and poor portability; and due to the need for high resolution, the lens assembly is highly sensitive and has poor manufacturability.

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

[0005] This application provides a compact, internally focused wide-angle photographic lens, which aims to solve the problems of large size and unsatisfactory imaging effect of existing wide-angle photographic lenses.

[0006] To achieve the above objectives, this application proposes a compact internal focusing wide-angle photographic lens, which, from the object side to the image side, comprises: 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 second lens group moves along the optical axis, while the positions of the first lens group and the third lens group relative to the image plane remain unchanged.

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

[0008] 1.5≤F1 / F≤3.5, (1);

[0009] 1≤F2 / F≤2, (2);

[0010] -3≤F3 / F≤-1, (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 aspherical lens.

[0013] 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, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power.

[0014] Wherein, the first lens is an aspherical lens; the second lens and the third lens are combined to form a first cemented lens group; the refractive index of the third lens is Nd3≥1.87; and the Abbe number of the fifth lens is Vd5≥60.

[0015] In some embodiments, the second lens and the third lens satisfy the following condition:

[0016] |Vd2-Vd3|≥20, (4)

[0017] Wherein, Vd2 is the Abbe number of the second lens in the first lens group with respect to light with a wavelength of 587.6 nm; Vd3 is the Abbe number of the third lens in the first lens group with respect to light with a wavelength of 587.6 nm.

[0018] 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 positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with negative optical power.

[0019] Wherein, the first lens is an aspherical lens; the fourth lens and the fifth lens are combined to form a second cemented lens group; the refractive index Nd of the second lens and the third lens is ≥1.85; and the Abbe number Vd4 of the fourth lens is ≥60.

[0020] In some embodiments, the fourth lens and the fifth lens satisfy the following condition:

[0021] |Vd4-Vd5|≥25,(5);

[0022] Wherein, Vd4 is the Abbe number of the fourth lens in the first lens group with respect to light with a wavelength of 587.6 nm; Vd5 is the Abbe number of the fifth lens in the first lens group with respect to light with a wavelength of 587.6 nm.

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

[0024] Wherein, the second lens is an aspherical lens; the third lens and the fourth lens are combined to form a third cemented lens group; the fifth lens and the sixth lens are combined to form a fourth cemented lens group; the Abbe number Vd of the second lens and the fifth lens is ≥60; and the refractive index Nd4 of the fourth lens is ≥1.85.

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

[0026] |Vd5-Vd6|≥30,(6);

[0027] Wherein, Vd5 is the Abbe number of the fifth lens in the first lens group with respect to light with a wavelength of 587.6 nm; Vd6 is the Abbe number of the sixth lens in the first lens group with respect to light with a wavelength of 587.6 nm.

[0028] In some embodiments, the second lens group includes a lens unit with negative optical power and a ninth lens with positive optical power arranged sequentially from the object side to the image side;

[0029] The lens unit is bent toward the aperture stop; the ninth lens is an aspherical lens, and the Abbe number Vd9 of the ninth lens is ≥60.

[0030] In some embodiments, the lens unit is a fifth cemented lens group with negative optical power, the fifth cemented lens group including a seventh lens with negative optical power and an eighth lens with positive optical power arranged sequentially from the object side to the image side.

[0031] In some embodiments, the seventh lens and the eighth lens satisfy the following condition:

[0032] |Vd7-Vd8|≥20,(7);

[0033] Wherein, 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; Vd8 is the Abbe number of the eighth lens in the second lens group with respect to light with a wavelength of 587.6 nm.

[0034] In some embodiments, the lens unit is a single lens with negative optical power.

[0035] In some embodiments, the third lens group includes at least one lens with a refractive index Nd ≥ 1.9.

[0036] In some embodiments, the third lens group includes, from the object side to the image side, a tenth lens with negative optical power, an eleventh lens with positive optical power, and a twelfth lens with negative optical power.

[0037] The refractive index of the eleventh lens is Nd11≥1.9.

[0038] In some embodiments, the third lens group includes, from the object side to the image side, a tenth lens with positive optical power, an eleventh lens with negative optical power, and a twelfth lens with positive optical power.

[0039] The tenth lens, the eleventh lens, and the twelfth lens are combined to form the sixth cemented lens group; the refractive index of the twelfth lens is Nd12≥1.9.

[0040] In some embodiments, the third lens group includes, from the object side to the image side, a tenth lens with positive optical power, an eleventh lens with negative optical power, and a twelfth lens with positive optical power.

[0041] The tenth lens and the eleventh lens are combined to form the seventh cemented lens group; the refractive index Nd12 of the twelfth lens is ≥1.9.

[0042] In some embodiments, the compact internal focusing wide-angle photographic lens satisfies the following condition:

[0043] 2≤TTL / D≤2.8, (8)

[0044] Where TTL is the total optical length and D is the target size.

[0045] This application also proposes a photographic apparatus comprising an image sensor and a compact internal focusing wide-angle photographic lens as described above, wherein the image sensor is detachably connected to the compact internal focusing wide-angle photographic lens.

[0046] This application proposes a compact, internally focused wide-angle photographic lens. This compact, internally focused wide-angle photographic lens includes three lens groups, wherein the first and third lens groups maintain their positions relative to the image plane, and the second lens group is a focusing lens group. The first, second, and third lens groups satisfy the following conditions: 1.5 ≤ F1 / F ≤ 3.5; 1 ≤ F2 / F ≤ 2; -3 ≤ F3 / F ≤ -1; 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, through a reasonable combination of lens groups, forms a compact, internally focused wide-angle photographic lens, and further clarifies the relationship between the focal length of each lens group and the overall focal length of the photographic lens. This design helps optimize the lens's optical performance, focusing mechanism, and simplifies design and manufacturing. Attached Figure Description

[0047] 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:

[0048] Figure 1 A schematic diagram of the structure of Embodiment 1 of the present invention is shown;

[0049] Figure 2 This diagram illustrates spherical aberration in embodiment 1 of the present invention when focusing at infinity.

[0050] Figure 3 This diagram illustrates the field curvature and distortion of Embodiment 1 of the present invention when focusing at infinity;

[0051] Figure 4 This diagram illustrates spherical aberration at the closest focusing distance in Embodiment 1 of the present invention.

[0052] Figure 5 This diagram illustrates the field curvature and distortion at the closest focusing distance in Embodiment 1 of the present invention.

[0053] Figure 6 A schematic diagram of the structure of Embodiment 2 of the present invention is shown;

[0054] Figure 7 This diagram illustrates spherical aberration in infinity focusing according to Embodiment 2 of the present invention.

[0055] Figure 8 This diagram illustrates the field curvature and distortion of Embodiment 2 of the present invention when focusing at infinity;

[0056] Figure 9 This diagram illustrates spherical aberration at the closest focusing distance in Embodiment 2 of the present invention.

[0057] Figure 10 This diagram illustrates the field curvature and distortion at the closest focusing distance in Embodiment 2 of the present invention.

[0058] Figure 11 A schematic diagram of the structure of Embodiment 3 of the present invention is shown;

[0059] Figure 12 This diagram illustrates spherical aberration in embodiment 3 of the present invention when focusing at infinity.

[0060] Figure 13 This diagram illustrates the field curvature and distortion of Embodiment 3 of the present invention when focusing at infinity;

[0061] Figure 14This diagram illustrates spherical aberration at the closest focusing distance in Embodiment 3 of the present invention.

[0062] Figure 15 The diagram shows the field curvature and distortion at the closest focusing distance in Embodiment 3 of the present invention. Detailed Implementation

[0063] 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.

[0064] See Figure 1 As shown, this application proposes a compact internal focusing wide-angle photographic lens. This compact internal focusing wide-angle photographic lens, from the object side to the image side, comprises: a first lens group G1 with positive optical power, an aperture stop STO, a second lens group G2 with positive optical power, and a third lens group G3 with negative optical power; during focusing, the second lens group G2 moves along the optical axis, while the positions of the first lens group G1 and the third lens group G3 relative to the image plane remain unchanged; the first lens group G1, the second lens group G2, and the third lens group G3 satisfy the following conditional expression:

[0065] 1.5≤F1 / F≤3.5, (1);

[0066] 1≤F2 / F≤2, (2);

[0067] -3≤F3 / F≤-1, (3);

[0068] In the formula, 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.

[0069] 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 STO, 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.

[0070] Secondly, the lens employs an internal single-lens-group focusing mechanism, where the second lens group G2 moves along the optical axis for focusing. This not only makes the lens structure more compact but also maintains good image quality. During focusing, the first lens group G1 and the third lens group G3 remain in constant position relative to the image plane, thereby reducing aberrations caused by changes in the relative positions of the lenses during focusing and improving image stability.

[0071] Furthermore, the optical power of the first lens group G1, the second lens group G2, and the third lens group G3 satisfies certain conditions, ensuring a reasonable distribution of optical power among the lens groups in the overall design and achieving good imaging results. Specifically:

[0072] Condition (1) indicates that the ratio between the composite focal length F1 of the first lens group G1 and the focal length F of the entire lens should be between 1.5 and 3.5. This ensures that the first lens group G1 plays an appropriate positive focal power role in the lens, which helps to collect light and form a clear image.

[0073] Condition (2) states that the ratio between the combined focal length F2 of the second lens group G2 and the focal length F of the entire lens should be between 1 and 2. Since the second lens group G2 moves during focusing, this ensures that a stable and appropriate positive power can be provided at different focal lengths.

[0074] Condition (3) states that the ratio between the composite focal length F3 of the third lens group G3 and the focal length F of the entire lens should be between -3 and -1. This indicates that the third lens group G3 has negative optical power, which helps to correct aberrations and optimize image quality.

[0075] In summary, these conditions collectively ensure that the compact internal focusing wide-angle lens provided in this application achieves high-quality wide-angle photography while maintaining a compact structure. By rationally designing the optical power of each lens group, the lens can provide clear and sharp images at different focal lengths.

[0076] In some embodiments, the first lens group G1 includes at least one aspherical lens.

[0077] In this embodiment, the aspherical lens can achieve a wider field of view. In wide-angle photography, the width of the field of view directly affects the shooting range. The design of the aspherical lens allows for better light distribution, thereby widening the field of view and enabling the photographer to capture a broader scene. That is, using an aspherical lens in the first lens group G1 can effectively reduce the front aperture of the lens, allowing for the capture of a wider scene through a smaller aperture lens. In this application's technical solution, the aspherical surface shape of the aspherical lens can be manufactured using the following conditional specifications:

[0078]

[0079] Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R); k is the conic coefficient; A i Is it an aspherical i-th -th The correction coefficients for each order. In the specific embodiment proposed, the radius of curvature R, the conic coefficient k of each surface of the aspherical surface, and the coefficients A of each order are... i This can be obtained based on the appendices in each embodiment.

[0080] Secondly, aspherical lenses can correct image distortion caused by spherical distortion by using the shape of aspherical curves. Compared with traditional spherical lenses, this can provide more realistic and natural images and improve visual comfort and adaptability to a certain extent.

[0081] Therefore, including at least one aspherical lens in the first lens group G1 allows the lens to provide photographers with clearer and wider shooting results while maintaining a compact design.

[0082] 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, a fourth lens L04 with negative optical power, a fifth lens L05 with positive optical power, and a sixth lens L06 with negative optical power; wherein, the first lens L01 is an aspherical lens; the second lens L02 and the third lens L03 are combined to form a first cemented lens group; the refractive index Nd3 of the third lens L03 is ≥1.87; and the Abbe number Vd5 of the fifth lens L05 is ≥60.

[0083] In this embodiment, a specific structural configuration of the first lens group G1 is proposed.

[0084] First, the first lens L01 has negative optical power and is an aspherical lens. The introduction of an aspherical lens helps reduce distortion and improve image sharpness and quality. Especially in wide-angle photography, the use of an aspherical lens can greatly correct the distortion of objects at the edges of the field of view.

[0085] Secondly, the second lens L02 and the third lens L03 are combined to form the first cemented lens group. Cemented lenses help reduce air gaps in the lens, thereby reducing light scattering and reflection, and improving image quality. At the same time, cemented lenses can also correct some chromatic aberration and aberration problems, and reduce the sensitivity during lens assembly.

[0086] Then, the Nd3 of the third lens L03 was set to be ≥1.87 and the Abbe number Vd5 of the fifth lens L05 was set to be ≥60. High refractive index lenses help achieve a compact and lightweight lens; high Abbe number lenses help reduce chromatic aberration and improve the accuracy of image colors.

[0087] Therefore, by combining aspherical lenses, cemented lens groups, high refractive index lenses, and high Abbe number lenses in the first lens group G1, the lens can provide clear, color-accurate images while remaining compact and lightweight, achieving high-quality wide-angle photography results.

[0088] Furthermore, the second lens L02 and the third lens L03 satisfy the following condition:

[0089] |Vd2-Vd3|≥20, (4)

[0090] Wherein, Vd2 is the Abbe number of the second lens L02 in the first lens group G1 with respect to light with a wavelength of 587.6nm; Vd3 is the Abbe number of the third lens L03 in the first lens group G1 with respect to light with a wavelength of 587.6nm.

[0091] Therefore, the difference (absolute value) between the Abbe numbers of the second lens L02 and the third lens L03 must be greater than or equal to 20. By utilizing the complementary dispersive characteristics of different lens materials and 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 dispersiveness and improving image quality.

[0092] 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 positive optical power, a third lens L03 with positive optical power, a fourth lens L04 with positive optical power, and a fifth lens L05 with negative optical power; wherein, the first lens L01 is an aspherical lens; the fourth lens L04 and the fifth lens L05 are combined to form a second cemented lens group; the refractive index Nd of the second lens L02 and the third lens L03 is ≥1.85; and the Abbe number Vd4 of the fourth lens L04 is ≥60.

[0093] In this embodiment, another specific structural configuration of the first lens group G1 is proposed.

[0094] In this embodiment, the lenses in the first lens group G1 are arranged in a specific order and with specific optical powers. The fourth lens L04 and the fifth lens L05 are combined to form the second cemented lens group. The refractive indices Nd of the second lens L02 and the third lens L03 are set to be ≥1.85, and the Abbe number Vd4 of the fourth lens L04 is set to be ≥60. This allows the camera lens to effectively manage light propagation and focusing, providing clear, color-accurate images while maintaining a compact and lightweight design, achieving high-quality wide-angle photography. The function of each lens group in this embodiment is similar to that of the specific structure of the first lens group G1, and will not be repeated here.

[0095] Furthermore, the fourth lens L04 and the fifth lens L05 satisfy the following condition:

[0096] |Vd4-Vd5|≥25,(5);

[0097] Wherein, Vd4 is the Abbe number of the fourth lens L04 in the first lens group G1 with respect to light with a wavelength of 587.6 nm; Vd5 is the Abbe number of the fifth lens L05 in the first lens group G1 with respect to light with a wavelength of 587.6 nm. Furthermore, it is required that the difference (absolute value) between the Abbe numbers of the fourth lens L04 and the fifth lens L05 in this embodiment is greater than or equal to 25.

[0098] In some embodiments, the first lens group G1 includes, from the object side to the image side, a first lens L01 with positive optical power, a second lens L02 with negative optical power, a third lens L03 with negative optical power, a fourth lens L04 with positive optical power, a fifth lens L05 with positive optical power, and a sixth lens L06 with negative optical power; wherein, the second lens L02 is an aspherical lens; the third lens L03 and the fourth lens L04 are combined to form a third cemented lens group; the fifth lens L05 and the sixth lens L06 are combined to form a fourth cemented lens group; the Abbe number Vd of the second lens L02 and the fifth lens L05 is ≥60; and the refractive index Nd4 of the fourth lens L04 is ≥1.85.

[0099] In this embodiment, another specific structural configuration of the first lens group G1 is proposed.

[0100] In this embodiment, the lenses in the first lens group G1 are arranged in a specific order and with specific optical powers. The third lens L03 and the fourth lens L04 are combined to form a third cemented lens group, and the fifth lens L05 and the sixth lens L06 are combined to form a fourth cemented lens group. The refractive indices Nd of the second lens L02 and the third lens L03 are set to be ≥1.85, and the Abbe number Vd4 of the fourth lens L04 is set to be ≥60. This allows the camera lens to effectively manage light propagation and focusing, providing clear, color-accurate images while maintaining a compact and lightweight design, achieving high-quality wide-angle photography. Therefore, the function of each lens group in this embodiment is similar to that of the specific structure of the first lens group G1, and will not be repeated here.

[0101] Furthermore, the fifth lens L05 and the sixth lens L06 satisfy the following condition:

[0102] |Vd5-Vd6|≥30,(6);

[0103] Wherein, Vd5 is the Abbe number of the fifth lens L05 in the first lens group G1 with respect to light with a wavelength of 587.6 nm; Vd6 is the Abbe number of the sixth lens L06 in the first lens group G1 with respect to light with a wavelength of 587.6 nm. Furthermore, it is required that the difference (absolute value) between the Abbe numbers of the fifth lens L05 and the sixth lens L06 in this embodiment is greater than or equal to 30.

[0104] In some embodiments, the second lens group G2 includes a lens unit with negative optical power and a ninth lens L09 with positive optical power arranged sequentially from the object side to the image side; wherein the lens unit is bent toward the aperture stop; the ninth lens L09 is an aspherical lens, and the Abbe number Vd9 of the ninth lens L09 is ≥60.

[0105] In this embodiment, the lens unit has negative optical power, which causes light to diverge and can be used to correct aberrations. Furthermore, the lens unit is bent towards the aperture stop, which can better control the path of light, reduce stray light and light loss, and prevent distortion.

[0106] Furthermore, a ninth lens L09 is provided, which is an aspherical lens that can precisely control the refraction and reflection of light, thereby significantly improving image quality and reducing aberrations and distortions. Simultaneously, the Abbe number Vd9 of the ninth lens L09 is set to ≥60, enabling high-quality color imaging. The aspherical surface shape of the ninth lens L09 can also be manufactured based on the conditional expression (9).

[0107] In some embodiments, the lens unit is a fifth cemented lens group with negative optical power, the fifth cemented lens group including a seventh lens L07 with negative optical power and an eighth lens L08 with positive optical power arranged sequentially from the object side to the image side.

[0108] In this embodiment, the lens unit is designed as a fifth cemented lens group consisting of a seventh lens L07 and an eighth lens L08. Therefore, the second lens unit L02 consists of a total of three lenses: the seventh lens L07, the eighth lens L08, and the ninth lens L09. As can be seen, the second lens group G2 has a smaller number of lenses, which can effectively reduce aberrations generated during focusing, reduce the focusing distance, and facilitate the miniaturization of the lens size.

[0109] Furthermore, the seventh lens L07 and the eighth lens L08 satisfy the following condition:

[0110] |Vd7-Vd8|≥20,(7);

[0111] Wherein, 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; Vd8 is the Abbe number of the eighth lens L08 in the second lens group G2 with respect to light with a wavelength of 587.6nm. Furthermore, it is required that the difference (absolute value) between the Abbe numbers of the seventh lens L07 and the eighth lens L08 in this embodiment is greater than or equal to 20.

[0112] In some embodiments, the lens unit is a single lens with negative optical power.

[0113] A single lens refers to a lens made from a single piece of optical glass or plastic material. It also corrects aberrations and optimizes image quality. Compared to cemented lenses or multi-lens groups, single lenses have advantages such as simple structure, low manufacturing cost, and light weight. Therefore, placing such a single lens as a lens unit in the second lens group G2 can effectively control the propagation path of light and achieve the desired imaging effect.

[0114] In some embodiments, the third lens group G3 includes at least one lens with a refractive index Nd ≥ 1.9.

[0115] In this embodiment, a lens with a refractive index Nd≥1.9 is used in the third lens group G3. High refractive index materials can more effectively converge or diverge light, thereby achieving a more compact lens design while maintaining high-quality imaging.

[0116] In some embodiments, the third lens group G3 includes, from the object side to the image side, a tenth lens L10 with negative optical power, an eleventh lens L11 with positive optical power, and a twelfth lens L12 with negative optical power; wherein, the refractive index Nd11 of the eleventh lens L11 is ≥1.9.

[0117] In this embodiment, a specific structural configuration of the third lens group G3 is proposed. The lenses in the third lens group G3 are arranged in a specific order and with specific optical power to achieve a specific optical effect, and the overall performance of the system is optimized by using a high-refractive-index eleventh lens L11.

[0118] Specifically, the tenth lens L10 has negative optical power and is located on the object side. Lenses with negative optical power are typically used to diverge light rays, which helps correct aberrations or achieve specific imaging effects. The eleventh lens L11 has positive optical power and is located between the tenth lens L10 and the twelfth lens L12, used to converge light rays. The twelfth lens L12 has negative optical power and is located on the image side. Similar to the tenth lens L10, it can be used to correct aberrations or achieve specific imaging effects.

[0119] In some embodiments, the third lens group G3 includes, from the object side to the image side, a tenth lens L10 with positive optical power, an eleventh lens L11 with negative optical power, and a twelfth lens L12 with positive optical power; wherein the tenth lens L10, the eleventh lens L11, and the twelfth lens L12 are combined to form a sixth cemented lens group; the refractive index Nd12 of the twelfth lens L12 is ≥1.9.

[0120] In this embodiment, another specific structural configuration of the third lens group G3 is proposed. The lenses in the third lens group G3 are arranged in a specific order and with specific optical power to achieve a particular optical effect. The overall performance of the system is optimized by combining the tenth lens L10, the eleventh lens L11, and the twelfth lens L12 to form the sixth cemented lens group, and by incorporating the high-refractive-index twelfth lens L12. The specific functions of each lens component are not elaborated here.

[0121] In some embodiments, the third lens group G3 includes, from the object side to the image side, a tenth lens L10 with positive optical power, an eleventh lens L11 with negative optical power, and a twelfth lens L12 with positive optical power; wherein, the tenth lens L10 and the eleventh lens L11 are combined to form a seventh cemented lens group; and the refractive index Nd12 of the twelfth lens L12 is ≥1.9.

[0122] In this embodiment, another specific structural configuration of the third lens group G3 is proposed. The lenses in the third lens group G3 are arranged in a specific order and with specific optical power to achieve specific optical effects. The overall performance of the system is optimized by combining the tenth lens L10 and the eleventh lens L11 to form the seventh cemented lens group, and by incorporating a high-refractive-index twelfth lens L12. The specific functions of each lens component are not elaborated here.

[0123] In some embodiments, the compact internal focusing wide-angle lens satisfies the following condition:

[0124] 2≤TTL / D≤2.8, (8)

[0125] Where TTL is the total optical length and D is the target size.

[0126] In this embodiment, setting condition (8) helps ensure that the lens can still provide sufficient imaging area to meet different photographic needs while maintaining a compact design. By optimizing the internal structure of the lens, such as the configuration of each lens group and the selection of lens materials, high-quality imaging effects can be achieved while maintaining a small and lightweight shape.

[0127] In this application, a parallel glass plate GL, configured as a filter, is arranged between the last lens (12th lens L12) 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.

[0128] Example 1

[0129] Figure 1 The diagram shown is a structural schematic of the compact internal focusing wide-angle photographic lens of Embodiment 1. Figure 1 As shown, in this embodiment, 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, a fourth lens L04 with negative optical power, a fifth lens L05 with positive optical power, and a sixth lens L06 with positive optical power; wherein, the first lens L01 is an aspherical lens; the second lens L02 and the third lens L03 are combined to form a first cemented lens group; the refractive index Nd3 of the third lens L03 is ≥1.87; and the Abbe number Vd5 of the fifth lens L05 is ≥60. The second lens group G2, from the object side to the image side, includes a seventh lens L07 with negative optical power, an eighth lens L08 with positive optical power, and a ninth lens L09 with positive optical power; wherein, the Abbe number Vd of the eighth lens L08 and the ninth lens L09 is ≥60, and the seventh lens L07 and the eighth lens L08 are combined to form the fifth cemented lens group; the Abbe number Vd9 of the ninth lens L09 is ≥60. The third lens group G3, from the object side to the image side, includes a tenth lens L10 with negative optical power, an eleventh lens L11 with positive optical power, and a twelfth lens L12 with negative optical power; wherein, the refractive index Nd11 of the eleventh lens L11 is ≥1.9.

[0130] In this embodiment, the numerical data of the compact internal focusing wide-angle camera lens are shown in Tables 1-3:

[0131] Table 1

[0132]

[0133]

[0134] Table 2

[0135]

[0136]

[0137] Table 3

[0138]

[0139] The surface number indicates the surface number of each lens from the object side to the image side.

[0140] 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.

[0141] The spherical aberration curves represent the spherical aberration curves at an aperture number of 1.47. The F, D, and C lines represent the spherical aberrations at wavelengths of 486 nm, 587 nm, and 656 nm, respectively. The horizontal axis represents the magnitude of the spherical aberration value, and the vertical axis represents the field of view. The field curvature curves represent the field curvature curves at a half-field angle ω of 14.02°. 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 value, and the vertical axis represents the field of view. The distortion curves represent the distortion curves at a half-field angle ω of 14.02°. The horizontal axis represents the distortion value, and the vertical axis represents the field of view. The above descriptions of the various spherical aberrations, field curvature, and distortion curves are the same as in other embodiments and will not be repeated below.

[0142] As can be seen from Figures 2-5, the camera lens of this embodiment 1 has good imaging effect.

[0143] Example 2

[0144] Figure 6 The diagram shown is a structural schematic of the compact internal focusing wide-angle photographic lens of Embodiment 2. Figure 6As shown, in this embodiment, 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 positive optical power, a third lens L03 with positive optical power, a fourth lens L04 with positive optical power, and a fifth lens L05 with negative optical power; the first lens L01 is an aspherical lens; the fourth lens L04 and the fifth lens L05 are combined to form a second cemented lens group; the refractive index Nd of the second lens L02 and the third lens L03 is ≥1.85; and the Abbe number Vd4 of the fourth lens L04 is ≥60. The second lens group G2, from the object side to the image side, includes a seventh lens L07 with negative optical power, an eighth lens L08 with positive optical power, and a ninth lens L09 with positive optical power; wherein, the Abbe number Vd of the eighth lens L08 and the ninth lens L09 is ≥60, and the seventh lens L07 and the eighth lens L08 are combined to form the fifth cemented lens group; the Abbe number Vd9 of the ninth lens L09 is ≥60. The third lens group G3, from the object side to the image side, includes a tenth lens L10 with positive optical power, an eleventh lens L11 with negative optical power, and a twelfth lens L12 with positive optical power; wherein, the tenth lens L10, the eleventh lens L11, and the twelfth lens L12 are combined to form the sixth cemented lens group; the refractive index Nd12 of the twelfth lens L12 is ≥1.9.

[0145] In this embodiment, the numerical data of the compact internal focusing wide-angle camera lens are shown in Tables 4-6:

[0146] Table 4

[0147]

[0148]

[0149] Table 5

[0150] Face number K A4 A6 A8 A10 S1 -7.510451E+00 3.821222E-06 -5.548819E-09 -1.121559E-11 4.270196E-13 S2 -8.016130E-01 -2.835580E-06 1.928978E-08 -2.186095E-10 1.402698E-12 S15 3.775914E-02 6.144094E-06 2.558469E-08 -3.034752E-10 1.953905E-12 S16 -2.228391E+00 2.781050E-05 3.128412E-07 -4.272387E-09 2.821734E-11

[0151] Table 6

[0152]

[0153]

[0154] 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.

[0155] As can be seen from Figures 7-10, the camera lens of this embodiment 2 has good imaging effect.

[0156] Example 3

[0157] Figure 11 The diagram shown is a structural schematic of the compact internal focusing wide-angle 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, sequentially includes a first lens L01 with positive optical power, a second lens L02 with negative optical power, a third lens L03 with negative optical power, a fourth lens L04 with positive optical power, a fifth lens L05 with positive optical power, and a sixth lens L06 with negative optical power; the second lens L02 is an aspherical lens; the third lens L03 and the fourth lens L04 are combined to form a third cemented lens group; the fifth lens L05 and the sixth lens L06 are combined to form a fourth cemented lens group; the Abbe number Vd of the second lens L02 and the fifth lens L05 is ≥60; and the refractive index Nd4 of the fourth lens L04 is ≥1.85. The second lens group G2, from the object side to the image side, includes a seventh lens L07 with negative optical power, an eighth lens L08 with positive optical power, and a ninth lens L09 with positive optical power; wherein, the Abbe number Vd of the eighth lens L08 and the ninth lens L09 is ≥60, and the seventh lens L07 and the eighth lens L08 are combined to form the fifth cemented lens group; the Abbe number Vd9 of the ninth lens L09 is ≥60. The third lens group G3, from the object side to the image side, includes a tenth lens L10 with positive optical power, an eleventh lens L11 with negative optical power, and a twelfth lens L12 with positive optical power; wherein, the tenth lens L10 and the eleventh lens L11 are combined to form the seventh cemented lens group; the refractive index Nd12 of the twelfth lens L12 is ≥1.9.

[0158] In this embodiment, the numerical data of the compact internal focusing wide-angle camera lens are shown in Tables 7-9:

[0159] Table 7

[0160]

[0161]

[0162]

[0163] Table 8

[0164] Face number K A4 A6 A8 A10 A12 S3 -5.00000E-01 1.91061E-05 -2.77441E-08 -5.60779E-11 2.1351E-12 8.540391E-13 S16 2.7121075E+01 -5.893726E-6 2.816820E-07 1.138730E-08 -5.507143E-11 0.000000E-00 S17 -4.214803 1.554091E-05 4.542965E-07 9.585659E-09 -1.799119E-11 0.000000E-00

[0165] Table 9

[0166]

[0167] 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.

[0168] As can be seen from Figures 12-15, the camera lens of this embodiment 3 has good imaging effect.

[0169] This application also provides a photographic apparatus. The photographic apparatus includes an image sensor and a compact internal focusing wide-angle photographic lens as described above, the image sensor being detachably connected to the compact internal focusing wide-angle photographic lens. The image sensor is a camera.

[0170] In this embodiment, the photographic device includes all the technical solutions of all the embodiments of the above-described compact internal focusing wide-angle photographic lens, 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.

[0171] 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 compact, internally focused wide-angle photographic lens, characterized in that, From the object side to the image side, the lens group comprises, 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 focusing, the second lens group moves along the optical axis, while the positions of the first lens group and the third lens group relative to the image plane remain unchanged. The first lens group, the second lens group, and the third lens group satisfy the following condition: 1.5≤F1 / F≤3.5, (1); 1≤F2 / F≤2, (2); -3≤F3 / F≤-1, (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 compact internal focusing wide-angle photographic lens according to claim 1, characterized in that, The first lens group includes at least one aspherical lens.

3. The compact internal focusing wide-angle photographic lens according to claim 2, 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, a fourth lens with negative optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. Wherein, the first lens is an aspherical lens; the second lens and the third lens are combined to form a first cemented lens group; the refractive index of the third lens is Nd3≥1.87; and the Abbe number of the fifth lens is Vd5≥60.

4. The compact internal focusing wide-angle photographic lens according to claim 3, characterized in that, The second lens and the third lens satisfy the following condition: |Vd2-Vd3|≥20, (4) Wherein, Vd2 is the Abbe number of the second lens in the first lens group with respect to light with a wavelength of 587.6 nm; Vd3 is the Abbe number of the third lens in the first lens group with respect to light with a wavelength of 587.6 nm.

5. The compact internal focusing wide-angle photographic lens according to claim 2, 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 positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with negative optical power. Wherein, the first lens is an aspherical lens; the fourth lens and the fifth lens are combined to form a second cemented lens group; the refractive index Nd of the second lens and the third lens is ≥1.85; and the Abbe number Vd4 of the fourth lens is ≥60.

6. The compact internal focusing wide-angle photographic lens according to claim 5, characterized in that, The fourth lens and the fifth lens satisfy the following condition: |Vd4-Vd5|≥25,(5); Wherein, Vd4 is the Abbe number of the fourth lens in the first lens group with respect to light with a wavelength of 587.6 nm; Vd5 is the Abbe number of the fifth lens in the first lens group with respect to light with a wavelength of 587.6 nm.

7. The compact internal focusing wide-angle photographic lens according to claim 2, characterized in that, The first lens group includes, from the object side to the image side, a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power. Wherein, the second lens is an aspherical lens; the third lens and the fourth lens are combined to form a third cemented lens group; the fifth lens and the sixth lens are combined to form a fourth cemented lens group; the Abbe number Vd of the second lens and the fifth lens is ≥60; and the refractive index Nd4 of the fourth lens is ≥1.

85.

8. The compact internal focusing wide-angle photographic lens according to claim 7, characterized in that, The fifth lens and the sixth lens satisfy the following condition: |Vd5-Vd6|≥30,(6); Wherein, Vd5 is the Abbe number of the fifth lens in the first lens group with respect to light with a wavelength of 587.6 nm; Vd6 is the Abbe number of the sixth lens in the first lens group with respect to light with a wavelength of 587.6 nm.

9. The compact internal focusing wide-angle photographic lens according to claim 1, characterized in that, The second lens group includes a lens unit with negative optical power and a ninth lens with positive optical power arranged sequentially from the object side to the image side; The lens unit is bent toward the aperture stop; the ninth lens is an aspherical lens, and the Abbe number Vd9 of the ninth lens is ≥60.

10. The compact internal focusing wide-angle photographic lens according to claim 9, characterized in that, The lens unit is a fifth cemented lens group with negative optical power. The fifth cemented lens group includes a seventh lens with negative optical power and an eighth lens with positive optical power arranged sequentially from the object side to the image side.

11. The compact internal focusing wide-angle photographic lens according to claim 10, characterized in that, The seventh lens and the eighth lens satisfy the following condition: |Vd7-Vd8|≥20,(7); Wherein, 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; Vd8 is the Abbe number of the eighth lens in the second lens group with respect to light with a wavelength of 587.6 nm.

12. The compact internal focusing wide-angle photographic lens according to claim 9, characterized in that, The lens unit is a single lens with negative optical power.

13. The compact internal focusing wide-angle photographic lens according to claim 1, characterized in that, The third lens group includes at least one lens with a refractive index Nd ≥ 1.

9.

14. The compact internal focusing wide-angle photographic lens according to claim 13, characterized in that, The third lens group, from the object side to the image side, includes a tenth lens with negative optical power, an eleventh lens with positive optical power, and a twelfth lens with negative optical power. The refractive index of the eleventh lens is Nd11≥1.

9.

15. The compact internal focusing wide-angle photographic lens according to claim 13, characterized in that, The third lens group, from the object side to the image side, includes a tenth lens with positive optical power, an eleventh lens with negative optical power, and a twelfth lens with positive optical power. The tenth lens, the eleventh lens, and the twelfth lens are combined to form the sixth cemented lens group; the refractive index of the twelfth lens is Nd12≥1.

9.

16. The compact internal focusing wide-angle photographic lens according to claim 13, characterized in that, The third lens group, from the object side to the image side, includes a tenth lens with positive optical power, an eleventh lens with negative optical power, and a twelfth lens with positive optical power. The tenth lens and the eleventh lens are combined to form the seventh cemented lens group; the refractive index Nd12 of the twelfth lens is ≥1.

9.

17. The compact internal focusing wide-angle photographic lens according to any one of claims 1-16, characterized in that, The compact, internally focused wide-angle lens satisfies the following condition: 2≤TTL / D≤2.8, (8) Where TTL is the total optical length and D is the target size.

18. A photographic apparatus, characterized in that, It includes an image sensor and a compact internal focusing wide-angle photographic lens as described in any one of claims 1-17, wherein the image sensor is detachably connected to the compact internal focusing wide-angle photographic lens.

Images