Large-aperture ultra-wide-angle micro single lens

Abstract

The invention relates to the technical field of wide-angle lenses, and discloses a large-aperture ultra-wide-angle micro single lens, which comprises a first lens group, a second lens group and a third lens group. The third lens group includes a front half group and a rear half group. The first lens group, the second lens group, the front half group and the rear half group are sequentially arranged from the object side to the image plane side. When an object moves from an infinite distance to a close distance, the first lens group and the third lens group are fixed, the second lens group moves towards an image plane direction, focusing is realized, and 0.65 < = F23A / tan omega * BFL < = 1.55. During use, in an infinite state, the aperture, the field angle and the focal length can be balanced by reasonably distributing the focal power and the spacing of each lens and controlling the half field angle of the optical system, so that a certain parameter is prevented from deviating from a normal range. Under the condition that F23A / tan omega * BFL is larger than or equal to 0.65 and smaller than or equal to 1.55, the ultra-large aperture and ultra-wide angle can be achieved, the ultra-large aperture ultra-wide angle lens can be used for complex scenes, and the harsh requirements of complex use environments are met.

Description

Technical Field

[0001] This application relates to the technical field of wide-angle lenses, and particularly to a large-aperture ultra-wide-angle mirrorless lens. Background Art

[0002] Currently, in digital camera equipment, the focusing group of wide-angle lenses with a field of view angle exceeding 100 degrees generally has a relatively heavy load, and it is difficult to ensure the focusing speed. Moreover, due to the excessive number of lenses, the lens has a large volume and high cost, and it cannot be said to be a miniaturized and high-performance wide-angle lens. At the same time, there are also ultra-wide-angle lenses with a low focusing load, but they have a complex structure, contain double-concave aspherical surfaces, are not easy to process, have a high cost, and a low cost performance, which is a heavy burden on the economy of the majority of photography enthusiasts. Therefore, there is an urgent need to research a new technical solution to solve the above problems.

[0003] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0004] To have a basic understanding of some aspects of the disclosed technical solutions, a simple summary is given below. This summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these technical solutions, but rather serves as a preface to the subsequent detailed description.

[0005] The technical solution of the present disclosure provides a large-aperture ultra-wide-angle mirrorless lens to solve the problems raised in the above background art.

[0006] In some technical solutions, the large-aperture ultra-wide-angle mirrorless lens includes: a first lens group with a negative refractive power; a second lens group with a positive refractive power; a third lens group with a positive refractive power, the third lens group includes a front half group and a rear half group, and the first lens group, the second lens group, the front half group, and the rear half group are arranged in sequence from the object side to the image plane side; wherein, when the object moves from infinity to a short distance, the first lens group and the third lens group are fixed, the second lens group moves towards the image plane direction to achieve focusing, and 0.65 ≤ |F2_3A / tanω*BFL| ≤ 1.55 is satisfied; wherein, the F2_3A is the focal length formed by the second lens group and the front half group in the infinite far state, the ω is the half field of view angle of the optical system in the infinite far state, and the BFL is the back focal length of the optical system in the infinite far state.

[0007] Optionally, it also satisfies: 0.6 ≤ ∣F1 / F∣ ≤ 1.3; wherein, the F1 is the focal length of the first lens group, and the F is the focal length of the optical system in the infinite far state.

[0008] Optionally, it also satisfies: 0.18 ≤ BF / F3 ≤ 0.4; where BF is the focal length of the optical system, and F3 is the focal length of the third lens group.

[0009] Optionally, it also satisfies: Vdp - Vdn > 30; where Vdp is the average Abbe number of the positive power lenses in the first half group, and Vdn is the average Abbe number of the negative power lenses in the first half group.

[0010] Optionally, it also satisfies: FOV > 100°; where FOV is the field of view angle of the lens.

[0011] Optionally, the first lens group includes: a first lens with negative refractive power; a second lens with negative refractive power; a third lens with negative refractive power; a fourth lens with positive refractive power; a fifth lens with positive refractive power; a sixth lens with negative refractive power; where the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in sequence from the object side to the image side.

[0012] Optionally, the second lens group includes: a seventh lens with positive refractive power.

[0013] Optionally, the first half group includes: an eighth lens with negative refractive power; a ninth lens with positive refractive power; a tenth lens with negative refractive power; where the eighth lens, the ninth lens, and the tenth lens are arranged in sequence from the object side to the image side.

[0014] Optionally, the second half group includes: an eleventh lens with negative refractive power.

[0015] A large aperture ultra-wide angle mirrorless camera lens provided by the technical solution of the present disclosure can achieve the following technical effects:

[0016] A large aperture ultra-wide angle mirrorless camera lens provided by the technical solution of the present disclosure includes a first lens group, a second lens group, and a third lens group. The first lens group has negative refractive power. The second lens group has positive refractive power. The third lens group has positive refractive power, and the third lens group includes a first half group and a second half group. The first lens group, the second lens group, the first half group, and the second half group are arranged in sequence from the object side to the image side. Among them, when the object moves from infinity to a close distance, the first lens group and the third lens group are fixed, the second lens group moves towards the image side to achieve focus, and it satisfies 0.65 ≤ |F2_3A / tanω*BFL| ≤ 1.55. Where F2_3A is the focal length formed by the second lens group and the first half group in the infinity state, ω is the half field of view angle of the optical system in the infinity state, and BFL is the back focal length of the optical system in the infinity state.

[0017] In use, in the infinite state, by reasonably distributing the optical power and spacing of each lens and controlling the half field angle of the optical system, it helps to balance the aperture, field angle and focal length, thereby avoiding a certain parameter deviating from the normal range. Under the condition of 0.65 ≤ |F2_3A / tanω*BFL| ≤ 1.55, a super large aperture and ultra wide angle can be achieved, and it can be used in complex scenarios to meet the demanding requirements of complex usage environments.

[0018] The above general description and the following description are only exemplary and explanatory, and are not used to limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0020] Figure 1 is a schematic structural diagram of Embodiment 1 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure;

[0021] Figure 2 is a spherical aberration diagram of Embodiment 1 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure;

[0022] Figure 3 is a field curvature aberration diagram of Embodiment 1 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure;

[0023] Figure 4 is a distortion aberration diagram of Embodiment 1 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure;

[0024] Figure 5 is a schematic structural diagram of Embodiment 2 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure;

[0025] Figure 6 is a spherical aberration diagram of Embodiment 2 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure;

[0026] Figure 7 is a field curvature aberration diagram of Embodiment 2 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure;

[0027] Figure 8 is a distortion aberration diagram of Embodiment 2 of a large aperture and ultra wide angle mirrorless camera lens provided by an embodiment of the present disclosure.

[0028] REFERENCE SIGNS:

[0029] 1. First lens group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 15. Fifth lens; 16. Sixth lens; 2. Second lens group; 3. Third lens group; 31. Front half group; 311. Eighth lens; 312. Ninth lens; 313. Tenth lens; 32. Rear half group; 321. Eleventh lens; 322. Twelfth lens. Detailed implementation manners

[0030] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The attached drawings are only for reference and illustration purposes and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0031] The terms "first", "second", etc. in the specification, claims and above-mentioned drawings of the embodiments of the present disclosure are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0032] In the embodiments of the present disclosure, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the embodiments of the present disclosure and their embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation. And, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0033] In addition, the terms "arranged", "connected", "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0034] Unless otherwise specified, the term "a plurality of" means two or more.

[0035] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0036] The term "and / or" is an associative relationship describing objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0037] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0038] Embodiment 1

[0039] Combined with Figure 1 and Figure 5 As shown, the embodiments of the present disclosure provide a large-aperture ultra-wide-angle mirrorless camera lens, including a first lens group 1, a second lens group 2, and a third lens group 3. The first lens group 1 has a negative diopter. The second lens group 2 has a positive diopter. The third lens group 3 has a positive diopter. The third lens group 3 includes a front half group 31 and a rear half group 32. The first lens group 1, the second lens group 2, the front half group 31, and the rear half group 32 are arranged in sequence from the object side to the image plane side. Among them, when the object moves from infinity to a close distance, the first lens group 1 and the third lens group 3 are fixed, and the second lens group 2 moves toward the image plane direction to achieve focus, and 0.65≤|F2_3A / tanω*BFL|≤1.55 is satisfied. Among them, F2_3A is the focal length formed by the second lens group 2 and the front half group 31 in the infinite far state, ω is the half field angle of the optical system in the infinite far state, and BFL is the back focal length of the optical system in the infinite far state.

[0040] A large-aperture ultra-wide-angle mirrorless camera lens provided by the embodiments of the present disclosure, in the infinite far state, by reasonably distributing the optical power and spacing of each lens, and by controlling the half field angle of the optical system, can help balance the aperture, field angle, and focal length, thereby avoiding a certain parameter deviating from the normal range. Under the condition of 0.65≤|F2_3A / tanω*BFL|≤1.55, a super large aperture and ultra-wide angle can be achieved, and it can be used in complex scenes to meet the harsh requirements of complex usage environments.

[0041] Optionally, combined with Figure 1 As shown, it also satisfies 0.6≤∣F1 / F∣≤1.3. Among them, F1 is the focal length of the first lens group 1, and F is the focal length of the optical system in the infinite far state.

[0042] In the embodiments of the present disclosure, when only satisfying the condition of 0.65 ≤ |F2_3A / tanω*BFL| ≤ 1.55, it is difficult to control the miniaturization of the effective aperture of the first lens group 1, and it is difficult to achieve an overall miniaturized and low-cost design solution at an ultra-wide field of view angle. While when also satisfying the condition of 0.6 ≤ ∣F1 / F∣ ≤ 1.3, it is possible to achieve an ultra-wide field of view angle while ensuring the distance from the last lens to the image plane.

[0043] Optionally, in combination with Figure 1 as shown, it also satisfies 0.18 ≤ BF / F3 ≤ 0.4. Wherein, BF is the focal length of the optical system, and F3 is the focal length of the third lens group 3.

[0044] In the embodiments of the present disclosure, when satisfying 0.65 ≤ |F2_3A / tanω*BFL| ≤ 1.55 and also satisfying 0.6 ≤ ∣F1 / F∣ ≤ 1.3, it is possible to effectively control the effective aperture and achieve an ultra-wide angle, but excessive strengthening will lead to difficulties in correcting various aberrations such as chromatic aberration and coma. While exceeding the upper limit of the condition of 0.6 ≤ ∣F1 / F∣ ≤ 1.3, although various aberrations can be well corrected, it is difficult to control the volume of the front group of the optical system while achieving an ultra-wide field of view angle. Therefore, it is also necessary to satisfy the condition of 0.18 ≤ BF / F3 ≤ 0.4 to achieve a miniaturized design.

[0045] Optionally, in combination with Figure 1 as shown, it also satisfies Vdp - Vdn > 30. Wherein, Vdp is the average Abbe number of the positive power lenses in the first half group 31, and Vdn is the average Abbe number of the negative power lenses in the first half group 31.

[0046] In the embodiments of the present disclosure, when only satisfying the condition of 0.18 ≤ BF / F3 ≤ 0.4, the diopter of the third lens group 3 will be too weak, resulting in too short a back intercept and being easily interfered with by the camera body components. Therefore, it is also necessary to satisfy the condition of Vdp - Vdn > 30 to ensure the diopter, increase the back intercept, and avoid interference with the camera body components.

[0047] Optionally, in combination with Figure 1 as shown, it also satisfies FOV > 100°. Wherein, FOV is the field of view angle of the lens.

[0048] In the embodiments of the present disclosure, it also satisfies the condition of FOV > 100° to achieve ultra-wide-angle shooting.

[0049] Optionally, in combination with Figure 1As shown, the first lens group 1 includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, and a sixth lens 16. The first lens 11 has a negative refractive power. The second lens 12 has a negative refractive power. The third lens 13 has a negative refractive power. The fourth lens 14 has a positive refractive power. The fifth lens 15 has a positive refractive power. The sixth lens 16 has a negative refractive power. Among them, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, and the sixth lens 16 are arranged in sequence from the object side to the image side.

[0050] In the embodiment of the present disclosure, the first lens group 1 is composed of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, and the sixth lens 16, and the whole has a negative refractive power.

[0051] Optionally, in combination with Figure 1 As shown, the second lens group 2 includes a seventh lens. The seventh lens has a positive refractive power.

[0052] In the embodiment of the present disclosure, the second lens group 2 is composed of a single seventh lens, so as to facilitate the adjustment of the position of the second lens group 2.

[0053] Optionally, in combination with Figure 1 As shown, the front half group 31 includes an eighth lens 311, a ninth lens 312, and a tenth lens 313. The eighth lens 311 has a negative refractive power. The ninth lens 312 has a positive refractive power. The tenth lens 313 has a negative refractive power. Among them, the eighth lens 311, the ninth lens 312, and the tenth lens 313 are arranged in sequence from the object side to the image side.

[0054] In the embodiment of the present disclosure, the front half group 31 is composed of the eighth lens 311, the ninth lens 312, and the tenth lens 313. The eighth lens 311, the ninth lens 312, the tenth lens 313 and the rear half group 32 together form the third lens group 3, and the whole has a negative refractive power.

[0055] Optionally, in combination with Figure 1 As shown, the rear half group 32 includes an eleventh lens 321. The eleventh lens 321 has a negative refractive power.

[0056] In the embodiment of the present disclosure, the rear half group 32 is composed of a single eleventh lens 321. The eighth lens 311, the ninth lens 312, the tenth lens 313 and the eleventh lens 321 together form the third lens group 3, and the whole has a negative refractive power.

[0057] In the first embodiment, the spherical aberration, field curvature aberration, and distortion aberration at the infinite far closest working distance are respectively as Figure 2 , Figure 3 and Figure 4 shown.

[0058] The data of Example 1 is as follows:

[0059]

[0060]

[0061] R (mm): The radius of curvature of each surface;

[0062] D (mm): The intervals between lenses and lens thicknesses; Nd: The refractive index of each glass for the d-line; Vd: The Abbe number of the glass;

[0063] Focal length: 21.3 mm;

[0064] Fno: 2.86;

[0065] Half field of view angle ω: 52.25°.

[0066] The data of focus adjustment is as follows:

[0067] Working distance inf 265 Focal length 21.3 19.9 D1 0.5 1.72 D2 3.02 1.80

[0068] Example 2

[0069] Optionally, as shown in Figure 5 , the first lens group 1 includes a first lens 11, a second lens 12, a third lens 13, a fifth lens 15, and a sixth lens 16. The first lens 11 has a negative diopter. The second lens 12 has a negative diopter. The third lens 13 has a negative diopter. The fifth lens 15 has a positive diopter. The sixth lens 16 has a negative diopter. Among them, the first lens 11, the second lens 12, the third lens 13, the fifth lens 15, and the sixth lens 16 are arranged in sequence from the object side to the image side.

[0070] In the embodiment of the present disclosure, the first lens group 1 is composed of the first lens 11, the second lens 12, the third lens 13, the fifth lens 15, and the sixth lens 16, and has an overall negative diopter.

[0071] Optionally, as shown in Figure 5 , the second half group 32 further includes a twelfth lens 322. The twelfth lens 322 has a negative diopter. Among them, the twelfth lens 322 and the eleventh lens 321 are arranged in sequence from the object side to the image side.

[0072] In the embodiment of the present disclosure, the second half group 32 is composed of the twelfth lens 322 and the eleventh lens 321. The eighth lens 311, the ninth lens 312, the tenth lens 313, the twelfth lens 322, and the eleventh lens 321 together form the third lens group 3, and have an overall negative diopter.

[0073] In Embodiment 2, the spherical aberration, field curvature aberration, and distortion aberration at the infinite - distance nearest working distance are respectively as Figure 6 , Figure 7 and Figure 8 shown.

[0074] The data of Embodiment 2 are as follows:

[0075]

[0076]

[0077] R (mm): The curvature radius of each surface;

[0078] D (mm): The interval between each lens and the lens thickness;

[0079] Nd: The refractive index of each glass for the d - line;

[0080] Vd: The Abbe number of the glass;

[0081] Focal length: 16.5 mm;

[0082] Fno: 2.05;

[0083] Half - field - of - view angle ω: 53.6.

[0084] The focusing data are as follows:

[0085] Working distance inf 170 Focal length 16.4 15.2 D1 0.58 2.31 D2 4.07 2.33

[0086] Combining the test data of Embodiment 1 and Embodiment 2, the conditional summary table is as follows:

[0087]

[0088]

[0089] The above description and the drawings fully disclose the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural and other changes. Embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations can vary. Parts and features of some embodiments can be included in or replaced by parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A large-aperture ultra-wide-angle mirrorless lens, characterized in that, Comprising: A first lens group with negative refractive power; A second lens group with positive refractive power; A third lens group with positive refractive power, the third lens group includes a front half group and a rear half group, and the first lens group, the second lens group, the front half group and the rear half group are arranged in sequence from the object side to the image plane side; Wherein, when the object moves from infinity to a near distance, the first lens group and the third lens group are fixed, and the second lens group moves towards the image plane direction to achieve focusing, and 0.65 ≤ |F2_3A / tanω * BFL| ≤ 1.55 is satisfied; Wherein, the F2_3A is the focal length formed by the second lens group and the front half group in the infinity state, the ω is the half field angle of the optical system in the infinity state, and the BFL is the back focal length of the optical system in the infinity state.

2. The large-aperture ultra-wide-angle mirrorless lens according to claim 1, wherein It also satisfies: 0.6 ≤ ∣F1 / F∣ ≤ 1.3; Wherein, the F1 is the focal length of the first lens group, and the F is the focal length of the optical system in the infinity state.

3. A large-aperture ultra-wide-angle mirrorless lens according to claim 1 or 2, characterized in that, It also satisfies: 0.18 ≤ BF / F3 ≤ 0.4; Wherein, the BF is the focal length of the optical system, and the F3 is the focal length of the third lens group.

4. A large-aperture ultra-wide-angle mirrorless lens according to claim 1, characterized in that, It also satisfies: Vdp - Vdn > 30; Wherein, the Vdp is the average Abbe number of the positive refractive power lenses in the front half group, and the Vdn is the average Abbe number of the negative refractive power lenses in the front half group.

5. A large-aperture ultra-wide-angle mirrorless lens according to claim 1, characterized in that, It also satisfies: FOV > 100°; Wherein, the FOV is the field angle of the lens.

6. A large-aperture ultra-wide-angle mirrorless lens according to any one of claims 1 to 5, characterized in that, The first lens group includes: A first lens with negative refractive power; A second lens with negative refractive power; A third lens with negative refractive power; A fourth lens with positive refractive power; A fifth lens with positive refractive power; A sixth lens with negative refractive power; Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image plane side.

7. A large-aperture ultra-wide-angle mirrorless lens according to any one of claims 1 to 5, characterized in that The second lens group includes: A seventh lens with positive refractive power.

8. A large-aperture ultra-wide-angle mirrorless lens according to any one of claims 1 to 5, characterized in that, The front half group includes: An eighth lens with negative refractive power; A ninth lens with positive refractive power; A tenth lens with negative refractive power; Wherein, the eighth lens, the ninth lens and the tenth lens are arranged in sequence from the object side to the image plane side.

9. A large-aperture ultra-wide-angle mirrorless lens according to any one of claims 1 to 5, characterized in that, The rear half group includes: An eleventh lens with negative refractive power.

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