Lens optical switching device, mobile phone protection shell and mobile phone high-definition shooting system

Abstract

The invention discloses a lens optical switching device, a mobile phone protection shell and a mobile phone high-definition shooting system.The lens optical switching device comprises a lens barrel, a first lens unit, a second lens unit, a third lens unit and a fourth lens unit, the lens barrel is provided with a first end and a second end which are opposite, the first end is used for being detachably connected with a lens, and the second end is used for being detachably connected with the mobile phone protection shell; the object side surface of the first lens unit is a plane, the image side surface of the first lens unit is a convex surface, the second lens unit is arranged in the lens barrel and is spaced from the first lens unit, the object side surface of the second lens unit is a plane, and the image side surface of the second lens unit is a concave surface. According to the technical scheme, the mobile phone can be compatible with a professional camera lens, and the purpose of high-quality photographing on the mobile phone is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of photographic equipment, and in particular to a lens optical adapter, a mobile phone protective shell and a mobile phone high-definition shooting system. Background Art

[0002] With the ubiquity of smartphones, photography has become an integral part of daily life. Whether taking photos or videos, mobile phone cameras have become a crucial tool for many people to record and share their lives. However, despite significant advancements in hardware and software, particularly in image processing technology, modern smartphones still have limitations when it comes to long-distance photography, high-magnification magnification, and capturing complex scenes. For users pursuing high-quality photography, especially for specialized photography like telephoto and macro photography, built-in mobile phone cameras often fail to match the quality of professional cameras.

[0003] To make up for this shortcoming, related technologies usually improve shooting capabilities by adding accessories such as magnification lenses to the back of the mobile phone camera.

[0004] However, achieving long-distance, high-definition photography with a mobile phone typically requires specially designed mobile phone lenses. These lenses are still limited in shooting distance and quality, and are not directly compatible with professional camera lenses, failing to fully utilize the advantages of professional lenses and their high performance and imaging capabilities. Summary of the Invention

[0005] The main purpose of the present invention is to provide a lens optical adapter device, which aims to solve the problem that mobile phone cameras are not compatible with professional camera lenses.

[0006] To achieve the above objectives, the present invention proposes a lens optical adapter device for use in a mobile phone high-definition shooting system. The mobile phone high-definition shooting system includes a mobile phone protective case and a lens adapter ring. The mobile phone protective case is used to mount the mobile phone, and the lens adapter ring is used to connect the camera lens. The lens optical adapter device includes:

[0007] a lens barrel having a first end and a second end opposite to each other, the first end being adapted to be detachably connected to the camera lens, and the second end being adapted to be detachably connected to the mobile phone protective case;

[0008] a first lens unit disposed in the lens barrel, wherein the object side surface of the first lens unit is a flat surface, and the image side surface of the first lens unit is a convex surface;

[0009] The second lens unit is disposed in the lens barrel and spaced apart from the first lens unit. The object side surface of the second lens unit is a flat surface, and the image side surface of the second lens unit is a concave surface.

[0010] In some embodiments, the first lens unit and the second lens unit are sequentially spaced apart along the first direction;

[0011] The first lens unit includes:

[0012] a first lens group, the first lens group having positive optical power, the object-side surface of the first lens assembly being flat, and the image-side surface of the first lens assembly being convex;

[0013] a second lens group, disposed on the image-side surface of the first lens group and spaced apart from the first lens group, the second lens group having negative optical power, the object-side surface of the second lens group being concave, and the image-side surface of the second lens group being convex;

[0014] The second lens unit includes:

[0015] a third lens group, the third lens group having positive refractive power, the object-side surface of the third lens group being a flat surface, and the image-side surface of the third lens group being a convex surface;

[0016] a fourth lens group, the fourth lens group having positive refractive power, the object-side surface of the fourth lens group being a convex surface, and the image-side surface of the fourth lens group being a flat surface;

[0017] The fifth lens group, the second lens group has negative optical power, the object side surface of the fifth lens group is convex, and the image side surface of the fifth lens group is concave.

[0018] In some embodiments, the first lens unit is composed of two lens groups, and the second lens unit is composed of three lens groups;

[0019] The sum of the number of lenses in the first lens unit and the second lens unit is five;

[0020] Alternatively, the sum of the number of lenses in the first lens unit and the second lens unit is eleven.

[0021] In some embodiments, the first lens group includes a first lens, a second lens, a third lens, and a fourth lens, arranged in order from the object side to the image side;

[0022] The object side surface of the first lens is a plane, and the image side surface is a convex surface with a curvature radius of R1;

[0023] The object side surface of the second lens is a concave surface with a curvature radius of R2, and the image side surface is a convex surface with a curvature radius of R3;

[0024] The object side surface of the third lens is a concave surface with a curvature radius of R4, and the image side surface is a flat surface;

[0025] The object side surface of the fourth lens is a concave surface with a curvature radius of R5, and the image side surface is a convex surface with a curvature radius of R6;

[0026] The first lens, the second lens, the third lens and the fourth lens are arranged closely in sequence; the effective optical diameters of the first lens, the second lens, the third lens and the fourth lens are OD1 <OD2<OD3<OD4。

[0027] In some embodiments, the second lens group includes a fifth lens, and the fifth lens is spaced apart from the fourth lens;

[0028] The object side surface of the fifth lens is a concave surface with a curvature radius of R7, the image side surface is a convex surface with a curvature radius of R8, and the effective optical diameter of the fifth lens is OD5, and OD5>OD4.

[0029] In some embodiments, the third lens group includes a sixth lens, a seventh lens, and an eighth lens arranged in order from the object side to the image side;

[0030] The object side surface of the sixth lens is a plane, and the image side surface is a concave surface with a curvature radius of R9; the effective optical diameter of the sixth lens is OD6;

[0031] The object side surface of the seventh lens is a flat surface, and the image side surface is a concave surface with a curvature radius of R10; the effective optical diameter of the seventh lens is OD7, and OD7 is equal to OD6;

[0032] The object-side surface of the eighth lens is a convex surface with a curvature radius of R11, the image-side surface is a convex surface with a curvature radius of R12, and the effective optical diameter of the eighth lens is OD8, ​​and OD8 is equal to OD7;

[0033] The object-side surface of the sixth lens is spaced apart from the image-side surface of the fifth lens, and the sixth lens, the seventh lens and the eighth lens are closely attached to each other.

[0034] In some embodiments, the fourth lens group includes a ninth lens element, the object-side surface of the ninth lens element is a convex surface with a curvature radius of R13, the image-side surface of the ninth lens element is a flat surface, the object-side surface of the ninth lens element is in close contact with the image-side surface of the eighth lens element, and the effective optical diameter of the ninth lens element is smaller than the effective optical diameter of the eighth lens element.

[0035] In some embodiments, the fifth lens group is a cemented mirror, the object side surface of the cemented mirror is convex, the image side surface of the cemented mirror is concave, the cemented mirror is configured to focus the light beams on the same plane, and the effective optical diameter of the fifth lens group is smaller than the effective optical diameter of the fourth lens group.

[0036] The present invention further proposes a mobile phone protective case, including a lens optical adapter device as described in the aforementioned embodiment, wherein the mobile phone protective case includes a first mounting portion and a second mounting portion, wherein the first mounting portion is used to fit the mobile phone, and the second mounting portion is connected to the second end of the lens barrel via a thread or a snap.

[0037] The present invention further provides a lens optical adapter device, comprising a lens barrel and a lens group disposed within the lens barrel, wherein the lens group is arranged along the optical axis from the object side to the image side and comprises:

[0038] a first lens group, wherein the first lens group has negative refractive power and an image-side optical surface thereof is a concave surface;

[0039] a second lens group, the second lens group having negative refractive power, wherein both the object-side optical surface and the image-side optical surface of the second lens group are concave surfaces;

[0040] a third lens group, the third lens group having positive refractive power, a concave object-side optical surface, and a convex image-side optical surface;

[0041] a fourth lens group having negative refractive power, a concave object-side optical surface, and a spherical image-side optical surface;

[0042] a fifth lens group having negative refractive power, a convex object-side optical surface, and a concave image-side optical surface;

[0043] The focal length of the lens optical adapter is f, the effective focal length of the second lens group is f2, the effective focal length of the third lens group is f3, and the effective focal length of the fourth lens group is f4, and the following relationship is satisfied:

[0044] 0.1<|f / f2|<0.3;

[0045] 0.4<|f / f3|<0.6;

[0046] 0.03<|f / f4|<0.06.

[0047] In some embodiments, the second lens group includes, arranged along the optical axis from the object side to the image side, the following:

[0048] A first lens having negative refractive power, wherein the curvature radius of the object-side optical surface of the first lens on the paraxial axis is R1, and the curvature radius of the image-side optical surface of the first lens on the paraxial axis is R1a;

[0049] The second lens element has negative refractive power, the curvature radius of the object-side optical surface of the second lens element on the paraxial axis is R2, the curvature radius of the image-side optical surface of the second lens element on the paraxial axis is R2a, and the following relationship is satisfied:

[0050] 1<|R1 / R1a|<1.4;

[0051] 0.2<|R2 / R2a|<0.4.

[0052] In some embodiments, the third lens group, arranged along the optical axis from the object side to the image side, includes:

[0053] a third lens having positive refractive power, wherein the object-side optical surface of the third lens is concave and the image-side optical surface is convex;

[0054] a fourth lens element having positive refractive power, wherein the object-side optical surface of the fourth lens element is flat, and the image-side optical surface of the fourth lens element is convex;

[0055] The object-side optical surface of the third lens has a paraxial curvature of R3, the image-side optical surface of the third lens has a paraxial curvature of R3a, and the image-side optical surface of the fourth lens has a paraxial curvature of R4a, and the following relationship is satisfied:

[0056] 2.0<|R3 / R3a|<2.6;

[0057] 45<|R4a|<65.

[0058] In some embodiments, the length of the lens optical adapter along the optical axis is L, the axial distance from the image-side optical surface of the second lens to the object-side optical surface of the third lens is T1, and the axial distance from the image-side optical surface of the third lens to the object-side optical surface of the fourth lens is T2, and the following relationship is satisfied:

[0059] 0.04 <T1 / L<0.08;

[0060] 30 <T1 / T2<40。

[0061] In some embodiments, the fourth lens group includes, arranged along the optical axis from the object side to the image side, the following:

[0062] The fifth lens element has positive refractive power, and both its object-side optical surface and image-side optical surface are concave;

[0063] The sixth lens element has negative refractive power and its image-side surface is concave;

[0064] The seventh lens element has positive refractive power, and both its object-side optical surface and image-side optical surface are convex;

[0065] The object-side optical surface of the fifth lens has a paraxial curvature radius of R5, and the image-side optical surface has a paraxial curvature radius of R5a; the image-side optical surface of the sixth lens has a paraxial curvature radius of R6a; the object-side optical surface of the seventh lens has a paraxial curvature radius of R7, and the image-side optical surface has a paraxial curvature radius of R7a, and the following relationship is satisfied:

[0066] 0.25<|R5 / R5a|<0.40;

[0067] 1.7<|R7 / R7a|<2.1;

[0068] |R6a–R7|<5;

[0069] 15<|f567 / f|<30.

[0070] In some embodiments, the paraxial distance from the image-side optical surface of the fourth lens to the object-side optical surface of the fifth lens is T3, and the paraxial distance from the image-side optical surface of the fifth lens to the object-side optical surface of the sixth lens is T4, and the following relationship is satisfied:

[0071] 5.5 <T3 / T4<6.5;

[0072] 0.05 <T3 / L<0.08;

[0073] 0.008 <T4 / L<0.015;

[0074] 0.55 <T3 / f<0.75。

[0075] The present invention further provides a lens optical adapter device, which comprises, arranged along the optical axis from the object side to the image side, the following components:

[0076] The first lens group includes a first lens having negative refractive power and a second lens, wherein the image-side optical surface of the first lens is convex on the paraxial direction, and the object-side optical surface and the image-side optical surface of the second lens are both concave on the paraxial direction;

[0077] The second lens group includes a third lens and a fourth lens having negative refractive power, wherein the object-side optical surface and the image-side optical surface of the third lens are both concave surfaces on the paraxial direction, and the image-side optical surface of the fourth lens is convex on the paraxial direction;

[0078] a third lens group including a fifth lens element and a sixth lens element having negative refractive power, wherein the object-side optical surface and the image-side optical surface of the fifth lens element are both concave surfaces on the paraxial direction, and the object-side optical surface and the image-side optical surface of the sixth lens element are both spherical surfaces on the paraxial direction;

[0079] a fourth lens group comprising a seventh lens element, an eighth lens element, a ninth lens element, and a tenth lens element, each having positive refractive power; the object-side optical surface of the seventh lens element is convex on the paraxial direction; the object-side optical surfaces and image-side optical surfaces of the eighth lens element and the ninth lens element are both concave on the paraxial direction; and the object-side optical surface and image-side optical surface of the tenth lens element are both convex on the paraxial direction;

[0080] A fifth lens group includes an eleventh lens and a twelfth lens having positive refractive power, wherein the object-side optical surface of the eleventh lens is convex on the paraxial direction, the object-side optical surface of the twelfth lens is spherical on the paraxial direction, and the image-side optical surface is concave, wherein the effective focal length of the lens optical adapter device is f10, the effective focal length of the first lens group is f11, the effective focal length of the second lens group is f12, the effective focal length of the third lens group is f13, and the effective focal length of the fourth lens group is f14, and the following relationship is satisfied:

[0081] 140 <f11 / f10<150;

[0082] 7.5 <f12 / f10<8.5;

[0083] 4.2 <f13 / f10<4.8;

[0084] 270 <f14 / f10<290。

[0085] In some embodiments, the object-side optical surface of the third lens has a paraxial curvature radius of R8, the image-side optical surface of the third lens has a paraxial curvature radius of R8a, and the image-side optical surface of the fourth lens has a paraxial curvature radius of R13, and the following relationship is satisfied:

[0086] 0.8<|R8 / R8a|<1.0;

[0087] 1.8<|R8a / R13|<2.3;

[0088] |R8+R8a|<15;

[0089] 45<|R8|<85.

[0090] In some embodiments, the fifth lens element has negative refractive power, the object-side optical surface of the fifth lens element has a paraxial curvature radius of R9, and the image-side optical surface of the fifth lens element has a paraxial curvature radius of R9a; the sixth lens element has positive refractive power, the object-side optical surface of the sixth lens element has a paraxial curvature radius of R10, and the image-side optical surface of the sixth lens element has a paraxial curvature radius of R10a, and the following relationship is satisfied:

[0091] 6.0<|R9 / R9a|<7.0;

[0092] 0.7<|R10 / R10a|<0.9;

[0093] |R9a–R10|<1.0;

[0094] 25<|R9|+|R10a|<35.

[0095] In some embodiments, the distance between the image-side optical surface of the sixth lens and the object-side optical surface of the seventh lens is T5, and satisfies the following relationship:

[0096] 0.025 <T5 / L<0.035;

[0097] 0.25 <T5 / f<0.35;

[0098] 1.8 <T1 / T5<2.2;

[0099] 3.0 <T5<4.5。

[0100] In some embodiments, the object-side optical surface of the seventh lens element has a paraxial curvature radius of R11, and the image-side optical surface has a paraxial curvature radius of R11a; the object-side optical surface of the eighth lens element has a paraxial curvature radius of R12, and the image-side optical surface has a paraxial curvature radius of R12a, and the following relationship is satisfied:

[0101] 0.15<|R11 / R11a|<0.20;

[0102] 0.75<|R12 / R12a|<0.95.

[0103] The present invention further provides a mobile phone high-definition shooting system, comprising a mobile phone, a camera lens, and a mobile phone protective case as described in the aforementioned embodiment.

[0104] The beneficial effect of the technical solution of the present invention is that the incompatibility problem between mobile phone lenses and professional camera lenses in the related art is solved by the combined arrangement of the first lens unit and the second lens unit in the lens optical adapter device. The first lens unit is configured by a flat object side and a convex image side to preliminarily focus and control the angle of light entry of the light beam, thereby ensuring the accuracy of light introduction during the shooting process. The concave image side of the second lens unit further receives and processes the light beam emitted by the first lens unit to control high-order aberrations and improve the shooting quality. In this way, not only can the imaging quality in complex scenes such as telephoto and macro be guaranteed, but also the advantages of the camera lens can be fully utilized to improve the professional performance of the mobile phone photography system, so that the mobile phone can be compatible with the professional camera lens, and the goal of high-quality photography on the mobile phone can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0105] Figure 1 A schematic diagram of the overall structure of a lens optical adapter device according to an embodiment of the present invention;

[0106] Figure 2 is a front view of a lens optical adapter device according to an embodiment of the present invention;

[0107] Figure 3 for Figure 2Section at AA in the middle;

[0108] Figure 4 for Figure 3 A cross-section from another perspective;

[0109] Figure 5 An exploded view of a lens optical adapter device according to an embodiment of the present invention;

[0110] Figure 6 This is an overall structural diagram of a mobile phone high-definition photography system in one embodiment of the present invention;

[0111] Figure 7 is an optical schematic diagram of a lens optical adapter device according to another embodiment of the present invention;

[0112] Figure 8 is an optical schematic diagram of a lens optical adapter device according to another embodiment of the present invention;

[0113] Figure 9 A diagram of field curvature of a lens optical adapter device according to another embodiment of the present invention;

[0114] Figure 10 An optical schematic diagram of a lens optical adapter device according to yet another embodiment of the present invention;

[0115] Figure 11 An optical schematic diagram of a lens optical adapter device according to yet another embodiment of the present invention;

[0116] Figure 12 FIG. 4 is a diagram of field curvature of a lens optical adapter device according to another embodiment of the present invention.

[0117] Description of Figure Numbers:

[0118] 100. Mobile phone protective case; 101. First mounting portion; 102. Second mounting portion;

[0119] 200, lens adapter ring;

[0120] 300, lens optical adapter;

[0121] 301, lens barrel; 301a, first end; 301b, second end;

[0122] 310, first lens unit;

[0123] 311, first lens group; G1, first lens; G2, second lens; G3, third lens; G4, fourth lens;

[0124] 312, second lens group;

[0125] 320, second lens unit;

[0126] 330, third lens group; G6, sixth lens; G7, seventh lens; G8, eighth lens; G9, ninth lens; G10, tenth lens; G11, eleventh lens; G12, twelfth lens;

[0127] 340, fourth lens group;

[0128] 350, fifth lens group;

[0129] 400, mobile phone protective case; 401, first mounting portion; 402, second mounting portion;

[0130] F mobile phone; 500, camera lens.

[0131] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0132] The following will be combined with the accompanying drawings to clearly and completely describe the solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0133] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0134] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0135] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0136] Related technologies usually improve shooting capabilities by adding accessories such as magnifying lenses to the back of mobile phone cameras. However, if you want to achieve long-distance high-definition shooting with a mobile phone, you usually need a specially designed mobile phone lens. The shooting distance and shooting effect of these lenses are still limited, and they are not directly compatible with professional camera lenses, and cannot give full play to the advantages of professional lenses, resulting in the inability to fully utilize the high performance and imaging capabilities of professional camera lenses. The mobile phone lens adapters currently on the market only provide mechanical connections and lack the necessary optical correction elements, resulting in serious imaging distortion, blurring, and chromatic aberration problems after the professional lens is connected to the mobile phone, and it is impossible to obtain the ideal shooting effect. Therefore, this embodiment proposes an optical adapter device that can effectively connect professional camera lenses and mobile phones to improve the professional performance of mobile phone photography. For details, please refer to Figures 1 to 3 The embodiment of the present invention provides a lens optical adapter device 300, which is applied to a mobile phone high-definition shooting system. The mobile phone high-definition shooting system includes a mobile phone protective case 100 and a lens adapter ring 200. The mobile phone protective case 100 is used to install the mobile phone, and the lens adapter ring 200 is used to connect the camera lens 500. The lens optical adapter device 300 includes:

[0137] The lens barrel 301 has a first end 301a and a second end 301b opposite to each other. The first end 301a is used to be detachably connected to the lens adapter ring 200, and the second end 301b is used to be detachably connected to the mobile phone protective case 100;

[0138] The first lens unit 310 is disposed in the lens barrel 301 , wherein the object-side surface of the first lens unit 310 is a flat surface, and the image-side surface of the first lens unit 310 is a convex surface;

[0139] The second lens unit 320 is disposed in the lens barrel 301 and spaced apart from the first lens unit 310 . The object-side surface of the second lens unit 320 is a flat surface, and the image-side surface of the second lens unit 320 is a concave surface.

[0140] In the present embodiment, the lens barrel 301 is a hollow cylindrical structure and can be made of aluminum alloy, stainless steel or high-strength engineering plastics, with the characteristics of being lightweight and durable. A lens mounting structure, such as a positioning groove, a fixing ring and an anti-vibration pad, can be set inside the lens barrel 301 to ensure that each lens unit is firmly installed and accurately aligned with the optical axis. Furthermore, the inner wall of the lens barrel 301 can be matted to effectively prevent internal reflection and scattered light, thereby avoiding the influence of stray light on imaging quality. In addition, standard threaded interfaces are provided at both ends of the lens barrel 301. The first end 301a adopts the universal camera lens 500 bayonet thread specification, and the second end 301b matches the connecting thread of the dedicated mobile phone protective shell 100.

[0141] The first lens unit 310 is mounted within the lens barrel 301, near the first end 301a, i.e., the object side. The object side of the first lens unit 310 is flat, minimizing distortion of the incident light and ensuring that light emitted from the professional lens enters the adapter with minimal distortion. The image side of the first lens unit 310 is convex, primarily used for initial focusing of light and controlling the divergence angle of the beam to suit the reception characteristics of mobile phone cameras.

[0142] The second lens unit 320 is mounted within the lens barrel 301 and is located near the second end 301b, i.e., the image side. The object side of the second lens unit 320 is a flat surface designed to receive light processed by the first lens unit 310 and maintain beam transmission accuracy. The image side of the second lens unit 320 is a concave surface, primarily used to compensate for spherical aberration introduced by the first lens unit 310 and to control the alignment of the imaging plane with the phone's camera sensor, ensuring clear imaging.

[0143] During use, the user first connects the first end 301a of the lens optical adapter to the lens adapter ring 200, then mounts a professional camera lens 500 (e.g., various models from brands such as Canon, Nikon, and Sony) on the lens adapter ring 200. Next, the second end 301b of the lens optical adapter is connected to the dedicated mobile phone protective case 100, and finally, the mobile phone is installed in the mobile phone protective case 100, completing the assembly of the entire system. It should be noted that this embodiment uses the lens adapter ring as an intermediary. In some embodiments, the lens optical adapter can be directly connected to a professional lens.

[0144] After passing through the professional lens, the optical path of light entering the adapter is as follows: First, the light passes through the lens adapter ring 200 and enters the interior of the lens barrel 301, reaching the flat object side of the first lens unit 310. Because the professional camera lens 500 is designed for larger sensors, the image surface it projects is much larger than that of a mobile phone camera sensor, requiring optical system adjustments. After passing through the flat object side of the first lens unit 310, the light encounters the convex image side, where it is initially focused, controlling the beam's divergence angle to within a range suitable for reception by a mobile phone camera.

[0145] The light processed by the first lens unit 310 then continues on to the flat object side of the second lens unit 320. This flat design ensures accurate beam transmission and reduces any additional distortion that may occur during transmission. After passing through the second lens unit 320 and onto its concave image side, the beam is further corrected, specifically compensating for higher-order aberrations while precisely aligning the imaging plane with the focal plane of the phone's camera sensor. Ultimately, the optically calibrated light enters the phone's camera, forming a clear image.

[0146] The beneficial effect of the technical solution of the present invention lies in: through the combined design of the first lens unit 310 and the second lens unit 320 in the lens optical adapter device 300, the incompatibility problem between mobile phone lenses and professional camera lenses 500 in the related art is resolved. Specifically, the first lens unit 310 is configured with a flat object side and a convex image side, which is used to initially focus and control the angle of the light beam, ensuring the accuracy of light introduction during the shooting process. The concave image side design of the second lens unit 320 further receives and processes the light beam emitted by the first lens unit 310, which is used to control high-order aberrations and improve the image quality.

[0147] The lens optical adapter 300 of the present invention effectively connects a professional camera lens 500 to a mobile phone camera, breaking through the limitations of traditional mobile phone photography. Users can utilize a variety of professional-grade lenses, including wide-angle, telephoto, and macro, for mobile phone photography, significantly improving the phone's performance in various shooting scenarios. In particular, the use of a large-aperture professional lens significantly enhances the phone's low-light shooting capabilities in low-light environments.

[0148] Furthermore, the device boasts a simple structure and is easy to use, achieving professional-grade photography without the need for complex debugging. It not only ensures image quality in complex scenes like telephoto and macro photography, but also fully leverages the advantages of the camera lens 500, enhancing the professional performance of the mobile phone photography system.

[0149] Continue reading Figure 3 and Figure 4 In this embodiment, the first lens unit 310 and the second lens unit 320 are sequentially spaced apart along the first direction;

[0150] The first lens unit 310 includes:

[0151] a first lens group 311, wherein the first lens group 311 has positive optical power, the object-side surface of the first lens group 311 is flat, and the image-side surface of the first lens group 311 is convex;

[0152] The second lens group 312 is disposed on the image-side surface of the first lens group 311 and is spaced apart from the first lens group 311. The second lens group 312 has negative optical power, the object-side surface of the second lens group 312 is concave, and the image-side surface of the second lens group 312 is convex.

[0153] The second lens unit 320 includes:

[0154] a third lens group 330 , wherein the third lens group 330 has positive refractive power, the object-side surface of the third lens group 330 is a flat surface, and the image-side surface of the third lens group 330 is a convex surface;

[0155] a fourth lens group 340 , wherein the fourth lens group 340 has positive refractive power, the object-side surface of the fourth lens group 340 is a convex surface, and the image-side surface of the fourth lens group 340 is a flat surface;

[0156] The fifth lens group 350 and the second lens group 312 have negative optical power. The object-side surface of the fifth lens group 350 is convex, and the image-side surface of the fifth lens group 350 is concave.

[0157] In this embodiment, the first lens unit 310 and the second lens unit 320 are sequentially spaced apart along the first direction to form a complete optical system for achieving optical matching between the professional camera lens 500 and the mobile phone camera.

[0158] The first lens unit 310 includes a first lens group 311 and a second lens group 312 arranged in sequence. The two lens groups work together and are mainly responsible for preliminarily receiving and processing light from the professional camera lens 500.

[0159] The first lens group 311 has positive optical power, meaning it converges incident light. The object-side surface of the first lens group 311 is designed to be flat, minimizing distortion of the incident light and ensuring that light emitted from the professional lens enters the adapter with minimal distortion. The image-side surface of the first lens group 311 is convex, allowing light passing through the flat object side to begin converging, paving the way for subsequent optical path processing.

[0160] The second lens group 312 is arranged on the image side of the first lens group 311 and is spaced apart from the first lens group 311 to ensure that there is sufficient optical path distance between the two lens groups to facilitate the spatial propagation and modulation of light. The second lens group 312 has a negative optical focal length and produces a divergent effect on the light, which forms an optical compensation with the converging effect of the first lens group 311. The object side of the second lens group 312 is a concave surface, which is used to receive the light after convergence by the first lens group 311 and begins to diverge it. The image side of the second lens group 312 is a convex surface. This hyperbolic design (concave-convex structure) forms a negative lens group, which is mainly used to correct spherical aberration and chromatic aberration, while controlling the exit angle of the light beam.

[0161] The second lens unit 320 is composed of three lens groups, namely the third lens group 330, the fourth lens group 340 and the fifth lens group 350. These three lens groups are arranged in sequence to form a complex optical modulation system, which is mainly responsible for adjusting the light and matching it with the sensor characteristics of the mobile phone camera.

[0162] The third lens group 330 has positive optical power, converging light. The object-side surface of the third lens group 330 is flat, facilitating reception of light processed by the first lens unit 310 and reducing additional optical path disturbances. The image-side surface of the third lens group 330 is convex, further converging the light and initiating the second stage of optical modulation.

[0163] The fourth lens group 340 has positive optical power, continuing the convergence trend of the third lens group 330 and further enhancing the light convergence effect. The object-side surface of the fourth lens group 340 is convex, forming an optical coupling with the convex image-side surface of the third lens group 330, enhancing the convergence capability. The image-side surface of the fourth lens group 340 is flat, which ensures that the converging light beam remains in a good phase plane upon exiting the fourth lens group 340, reducing wavefront distortion.

[0164] The fifth lens group 350 has negative optical power, diverging the light. The object-side surface of the fifth lens group 350 is convex, receiving the light rays converged by the first two lens groups. The image-side surface of the fifth lens group 350 is concave, forming a typical negative lens structure. This structure provides final adjustment to the light beam at the final stage of the optical path, primarily used to precisely control the focal plane position to accurately match the sensor plane of the mobile phone camera and compensate for any remaining aberrations in the system.

[0165] After passing through the professional lens, the light passes through the lens adapter ring 200 and enters the interior of the lens barrel 301, reaching the first lens group 311 of the first lens unit 310. Because the object side of the first lens group 311 is flat, the light undergoes almost no refraction, preserving the original imaging information. When the light passes through the convex image side of the first lens group 311, it begins to converge, and the beam angle begins to deflect toward the optical axis.

[0166] After undergoing initial convergence, the light beams continue on their journey, reaching the concave object side of the second lens group 312. At this point, the light beams, affected by the negative lens element, begin to diverge moderately. This divergence primarily corrects spherical and chromatic aberrations while also controlling the field of view. As the light beams pass through the convex image side of the second lens group 312, they undergo further adjustment, keeping their divergence within an appropriate range, preparing for subsequent optical path processing.

[0167] After leaving first lens unit 310, light enters second lens unit 320 and first reaches the flat object side of third lens group 330. This flat object side design ensures stable beam transmission and reduces the introduction of additional distortion. When light passes through the convex image side of third lens group 330, it again converges, bending the beam angle toward the optical axis.

[0168] The light then enters the convex object side of the fourth lens group 340, where the converging effect is further enhanced. As the light passes through the flat image side of the fourth lens group 340, the highly converging beam leaves the fourth lens group 340 in a well-defined phase plane state, ready for final optical adjustment.

[0169] Finally, the light reaches the convex object side of fifth lens group 350, undergoing final adjustments at the crucial stage just before image formation. As the light passes through the concave image side of fifth lens group 350, it is moderately diverged by the negative lens element. This final divergence precisely controls the position of the focal plane, ensuring that the image plane is precisely aligned with the phone camera sensor while compensating for any remaining aberrations in the entire optical system.

[0170] Through the coordination of these five lens groups, the light emitted by the professional camera lens 500 undergoes appropriate optical modulation and ultimately forms a high-quality image on the sensor of the mobile phone camera that is clear, color-accurate, and has no obvious distortion, thus achieving the matching of the professional lens and the mobile phone camera system.

[0171] Continue reading Figure 3 In this embodiment, the first lens unit 310 is composed of two lens groups, and the second lens unit 320 is composed of three lens groups;

[0172] The sum of the number of lenses in the first lens unit 310 and the second lens unit 320 is five;

[0173] Alternatively, the sum of the number of lenses of the first lens unit 310 and the second lens unit 320 is eleven.

[0174] In this embodiment, the first lens unit 310 is composed of two lens groups, and the second lens unit 320 is composed of three lens groups. This combined design forms a complete optical switching system. Specifically, the first lens unit 310 includes the aforementioned first lens group 311 and second lens group 312, while the second lens unit 320 includes a third lens group 330, a fourth lens group 340, and a fifth lens group 350.

[0175] This embodiment provides two specific lens configuration options. For example, the sum of the number of lenses in the first lens unit 310 and the second lens unit 320 is five. In this configuration, each lens group is essentially composed of a single lens, forming a simple optical system. This configuration is suitable for applications with high requirements for volume and cost, achieving a lightweight and compact structure while maintaining basic optical performance.

[0176] In another embodiment, the total number of lenses in the first lens unit 310 and the second lens unit 320 is eleven. In this configuration, some lens groups can employ composite lens designs, such as doublets or triplets, to form a more complex optical system. This configuration is suitable for professional applications requiring high imaging quality, and can more effectively correct various optical aberrations, including chromatic aberration, spherical aberration, coma, and astigmatism, providing higher-quality imaging.

[0177] Users can choose the appropriate configuration based on their needs. The first option is simple and economical, suitable for everyday photography; the second option offers excellent performance, suitable for professional photography. Regardless of the configuration chosen, the optical adapter device of the present invention effectively achieves optical matching between the professional camera lens 500 and the mobile phone camera, significantly improving the professional performance of the mobile phone photography system.

[0178] See Figure 3 and Figure 4 In this embodiment, the first lens group 311 includes a first lens G1, a second lens G2, a third lens G3, and a fourth lens G4, arranged in order from the object side to the image side;

[0179] The object side of the first lens G1 is flat, while the image side is convex with a curvature radius of R1. This flat object side design allows light from the professional lens to enter the system directly without additional refraction interference, preserving the original imaging information. The convex image side begins to perform preliminary convergence modulation on the light.

[0180] The object-side surface of the second lens G2 is a concave surface with a curvature radius of R2, and the image-side surface is a convex surface with a curvature radius of R3; this concave-convex structure forms a typical negative lens, which is mainly used to correct chromatic aberration and spherical aberration.

[0181] The object side surface of the third lens G3 is a concave surface with a curvature radius of R4, and the image side surface is a flat surface; the concave object side continues to modulate the light, while the flat image side ensures that the light leaves in a good phase state.

[0182] The object side surface of the fourth lens G4 is a concave surface with a curvature radius of R5, and the image side surface is a convex surface with a curvature radius of R6; the light is finely adjusted again, for example, to compensate for the light at the edge of the field of view.

[0183] Among them, the first lens G1, the second lens G2, the third lens G3, and the fourth lens G4 are arranged closely in sequence; an optical component without gaps is formed, reducing interface reflection and scattering, and improving optical efficiency. The effective optical diameters of the first lens G1, the second lens G2, the third lens G3, and the fourth lens G4 are OD1 < OD2 < OD3 < OD4 in sequence (for example, OD1 = 10 mm, OD2 = 15 mm, OD3 = 20 mm, OD4 = 25 mm). This gradually increasing diameter design ensures that the light beam will not be limited by the aperture during propagation, ensuring the imaging quality of the edge field of view.

[0184] In terms of the radius of curvature, in this embodiment, the magnitudes of the radius of curvature are R1 < R2 < R3 < R4 < R5 < R6 in sequence. This gradually increasing configuration of the radius of curvature has important optical significance.

[0185] For example, assume the specific values are: R1 = 10 mm, R2 = 15 mm, R3 = 20 mm, R4 = 25 mm, R5 = 30 mm, R6 = 35 mm. In this configuration, the light first undergoes obvious refraction through the surface with strong curvature (R1), and then undergoes gradually weakened refraction effects (R2 to R6), achieving a smooth transition of the light, effectively reducing the accumulation effect of aberrations, and showing excellent control over high-order aberrations.

[0186] Another example, if another set of parameters is adopted: R1 = 8 mm, R2 = 12 mm, R3 = 18 mm, R4 = 24 mm, R5 = 32 mm, R6 = 40 mm. In this configuration, the strong refraction effect on the front surface and the weak refraction effect on the rear surface form a greater contrast, which is suitable for controlling the peripheral light of a large-aperture professional lens and improving the resolution of the edge field of view.

[0187] This gradually arranged radius of curvature forms a refractive force distribution from strong to weak, enabling the light to be appropriately refracted on different surfaces, achieving an ideal light path control effect. This design is suitable for the situation where a professional camera lens 500 image with a large field of view needs to be re-projected onto a smaller mobile phone sensor, effectively maintaining the field of view range of the original image while controlling various aberrations. / /

[0188] Refer to Figures 3 to 5 , in this embodiment, the second lens group 312 includes a fifth lens, and the fifth lens is arranged at an interval from the fourth lens G4;

[0189] Among them, the object side surface of the fifth lens is a concave surface with a radius of curvature of R7, the image side surface is a convex surface with a radius of curvature of R8, the effective optical diameter of the fifth lens is OD5, and OD5 > OD4. / /

[0190] In this embodiment, the second lens group 312 includes a fifth lens element spaced apart from the fourth lens element G4 of the first lens group 311. This creates an air gap, ensuring that light travels an appropriate distance between the two lens groups, facilitating beam shaping and modulation. The presence of this air gap provides additional design freedom for the entire optical system.

[0191] The object-side surface of the fifth lens is concave with a curvature radius of R7, and the image-side surface is convex with a curvature radius of R8. This concave-convex structure forms a typical negative lens, which can modulate the divergence of the light beam passing through the first lens group 311, control the convergence angle of the light, correct the spherical and chromatic aberration introduced by the first lens group 311, and adjust the position of the imaging plane to match the subsequent optical path. It also expands the effective field of view and increases the imaging coverage.

[0192] Of particular note is the effective optical diameter of the fifth lens element, OD5, which satisfies the relationship OD5 > OD4. From a ray tracing perspective, after the light beam passes through first lens group 311, the divergent effect of the negative lens increases the beam diameter. Therefore, the fifth lens element requires a larger effective optical diameter to fully receive all light emitted by first lens group 311, preventing beam truncation and dark corners or vignetting.

[0193] For example, consider a specific configuration with parameters such as OD4 = 15mm, OD5 = 18mm, R7 = 40mm, and R8 = 45mm. In this configuration, the fifth lens element, serving as the core element of second lens group 312, has a 3mm diameter margin sufficient to receive marginal rays, ensuring vignetting-free imaging across the entire field of view. Furthermore, the curvature of R7 and R8 creates a moderately negative optical power, precisely modulating the light beam from first lens group 311.

[0194] In terms of material selection, the fifth lens can use optical glass with a high dispersion ratio (such as the SF series), which can more effectively correct the chromatic aberration of the system and improve the color reproduction ability of the imaging.

[0195] In general, the design of the second lens group 312 in this embodiment forms an organic optical whole with the first lens group 311. The two work together to achieve the goal of converting the imaging characteristics of the professional camera lens 500 into optical characteristics suitable for mobile phone cameras.

[0196] Continue reading Figures 3 to 5 In this embodiment, the third lens group 330 includes a sixth lens G6, a seventh lens G7, and an eighth lens G8, which are arranged in order from the object side to the image side;

[0197] The object-side surface of the sixth lens element G6 is flat, and the image-side surface is concave with a radius of curvature R9. The effective optical diameter of the sixth lens element G6 is OD6. The flat object-side design allows light from the second lens group 312 to enter the third lens group 330 with minimal interface changes, reducing interface reflection and scattering. The concave image-side surface performs preliminary negative refraction modulation on the incident light beam, initiating precise control of the light propagation path.

[0198] The object-side surface of the seventh lens element, G7, is flat, and the image-side surface is concave with a radius of curvature of R10. The effective optical diameter of the seventh lens element, G7, is OD7, which is equal to OD6. This creates optical continuity with the sixth lens element, G6, with the two continuous flat-concave structures forming a reinforced negative lens combination. Of particular note is the effective optical diameter of the seventh lens element, G7, which is OD7, which is equal to OD6. This equal-diameter design ensures that the two lenses are perfectly matched in radial dimensions, facilitating optical processing and assembly. It also ensures that the beam will not experience unexpected aperture effects due to changes in lens size during transmission.

[0199] The object-side surface of the eighth lens element G8 is convex with a radius of curvature R11, and the image-side surface is convex with a radius of curvature R12. The effective optical diameter of the eighth lens element G8 is OD8, ​​which is equal to OD7. This biconvex structure forms a typical positive lens, which converges and modulates the diverging light beams generated by the first two lenses, returning the light path to the intended propagation direction. The effective optical diameter of the eighth lens element G8 is OD8, ​​which is equal to OD7. This design of three equal-diameter elements creates radial dimensional uniformity, providing excellent structural stability and optical consistency for the entire third lens group 330.

[0200] In terms of lens arrangement, the object-side surface of the sixth lens element G6 is spaced apart from the image-side surface of the fifth lens element. This spacing creates an air gap between the second lens group 312 and the third lens group 330, serving as a key dividing point in the optical system. The sixth lens element G6, the seventh lens element G7, and the eighth lens element G8 are positioned closely together, forming a gapless composite lens group. This close-fitting design reduces interfacial reflections, improves light transmittance, and enhances the mechanical stability of the lens group.

[0201] Furthermore, the two consecutive negative lenses (sixth lens G6 and seventh lens G7) effectively control spherical and chromatic aberrations, primarily by optimizing the aberration profile of the preliminarily modulated light beam from second lens group 312. Furthermore, the final positive lens (eighth lens G8) moderately converges the diverging light beam, providing suitable incident conditions for subsequent lens groups.

[0202] This composite lens design boasts significant patented features. The close proximity of the three equal-diameter lenses simplifies processing and assembly, reducing manufacturing costs. Furthermore, the "two negative, one positive" optical configuration provides excellent aberration balance, guaranteeing the imaging quality of the entire optical adapter.

[0203] Continue reading Figures 3 to 5 In this embodiment, the fourth lens group 340 includes a ninth lens. The object-side surface of the ninth lens is a convex surface with a curvature radius of R13, the image-side surface of the ninth lens is a flat surface, the object-side surface of the ninth lens is in close contact with the image-side surface of the eighth lens G8, and the effective optical diameter of the ninth lens is smaller than the effective optical diameter of the eighth lens G8.

[0204] In this embodiment, the fourth lens group 340 adopts a simple single lens structure, including a ninth lens. The object side of the ninth lens is a convex surface with a curvature radius of R13, and the image side is a flat surface, forming a typical positive lens, whose main optical function is to converge the light beam.

[0205] It's worth noting that the object-side surface of the ninth lens element is placed in close contact with the image-side surface of the eighth lens element, G8. This firstly eliminates the air gap between the two lenses, reducing interfacial reflection and scattering, and improving optical efficiency. Secondly, this close contact design effectively forms a composite positive lens group with the eighth lens element, G8 and the ninth lens element, working together to precisely control the convergence of light.

[0206] In addition, the effective optical diameter of the ninth lens is smaller than that of the eighth lens G8. On the one hand, it can reduce the impact of edge stray light on image quality, optimize depth of field performance, and improve the resolution of the central area; on the other hand, it can reduce the optical burden of subsequent lens groups, simplify system design, and control the field of view again, making it more suitable for the receiving characteristics of mobile phone cameras.

[0207] This design of smaller optical diameter actually makes the ninth lens play the dual role of lens and aperture in the optical system, refracting and modulating the light and controlling the beam diameter.

[0208] See Figure 3 and Figure 4 In this embodiment, the fifth lens group 350 is a cemented mirror, the object side surface of the cemented mirror is convex, the image side surface of the cemented mirror is concave, and the cemented mirror is configured to focus the light beams on the same plane. The effective optical diameter of the fifth lens group 350 is smaller than the effective optical diameter of the fourth lens group 340.

[0209] In this embodiment, the fifth lens group 350 utilizes a cemented lens structure, consisting of two lenses (e.g., labeled G10 and G11) bonded tightly together with optical glue. The object-side surface of the cemented lens is convex, while the image-side surface is concave, forming a typical "convex-concave" structure. This cemented lens is located at the very end of the optical adapter, directly closest to the phone, and serves as the final optical element before light enters the phone's camera.

[0210] First, the cemented lens design effectively corrects chromatic aberration. For example, when the two lenses are made of optical materials with different refractive indices and dispersions, excellent achromatic effects can be achieved. Second, the "convex-concave" structure forms a unique optical combination with both converging and diverging optical properties, enabling precise control of the final image plane of light.

[0211] It's important to note that the fifth lens group 350 is specifically configured to focus the light beams on a single plane, ensuring that the light emitted from the professional camera lens 500, after being modulated by the previous lens groups, ultimately forms a clear image on the sensor plane of the mobile phone camera. This planar focusing capability is crucial for eliminating field of view curvature and ensuring uniform clarity across the entire field of view.

[0212] Furthermore, the effective optical diameter of the fifth lens group 350 is smaller than that of the fourth lens group 340. This controls the range of the light beam entering the mobile phone camera, avoiding aberrations and stray light caused by peripheral light, and improving image quality in the central area. In other words, as the final optical element, the fifth lens group 350 acts as a "tuner," providing final, fine-tuned adjustments to the light processed by all preceding lens groups, ensuring that the output beam of the entire optical adapter perfectly matches the reception characteristics of the mobile phone camera.

[0213] See Figures 7 and 8 The present invention further provides an optical switching device, comprising a lens barrel 301 and a lens group disposed in the lens barrel 301, wherein the lens group is arranged along the optical axis from the object side to the image side and comprises:

[0214] A first lens group 311, wherein the first lens group 311 has negative refractive power and its image-side optical surface is concave;

[0215] The second lens group 312 has negative refractive power, and both the object-side optical surface and the image-side optical surface thereof are concave;

[0216] The third lens group 330 has positive refractive power, its object-side optical surface is concave, and its image-side optical surface is convex;

[0217] The fourth lens group 340 has negative refractive power, its object-side optical surface is concave, and its image-side optical surface is spherical;

[0218] a fifth lens group 350 having negative refractive power, a convex object-side optical surface, and a concave image-side optical surface;

[0219] The focal length of the lens optical adapter is f, the effective focal length of the second lens group 312 is f2, the effective focal length of the third lens group 330 is f3, and the effective focal length of the fourth lens group 340 is f4, and the following relationship is satisfied:

[0220] 0.1<|f / f2|<0.3; 0.4<|f / f3|<0.6; 0.03<|f / f4|<0.06.

[0221] In this embodiment, the focal length of the lens optical adapter is f = 12.88 mm. The effective focal length of the first lens group 311 is f1 = -291.36 mm, the effective focal length of the second lens group 312 is f2 = -58.6 mm, the effective focal length of the third lens group 330 is f3 = -26.78 mm, and the effective focal length of the fourth lens group 340 is f4 = -294.86 mm. Calculation of actual parameters yields |f / f2| = 0.22, |f / f3| = 0.48, and |f / f4| = 0.044, meeting the design requirements.

[0222] This optical adapter is designed to achieve high-quality downscaling from professional camera lens images to mobile phone sensors. For example, professional camera lenses typically accommodate full-frame sensors (36×24mm), while mobile phone sensors are approximately 6×4.5mm, requiring a downscaling ratio of approximately 6:1. The adapter achieves this technical goal through a negative-negative-positive-negative-negative refractive power configuration and a graded beam control method.

[0223] The first lens group 311 utilizes a weakly negative refractive power design (f1 = -291.36mm). As the beam receiving end of the entire system, in this embodiment, it primarily receives the output beam from the professional lens and performs preliminary beam divergence control. Due to its large absolute focal length and relatively weak refractive power, it can gently process the incident beam while avoiding the introduction of excessive high-order aberrations. The image-side concave surface design helps control spherical aberration and, through appropriate aspheric coefficient optimization, creates favorable optical conditions for beam processing by subsequent lens groups.

[0224] The second lens group 312 undertakes the important tasks of beam divergence and aberration correction, and its negative refractive power (f2 = -58.6mm) is stronger than that of the first lens group 311. The limitation of the relationship 0.1 <|f / f2| <0.3 ensures a moderate degree of divergence. This ratio range can not only effectively control the beam angle, but also avoid the loss of light energy and image quality degradation caused by excessive divergence. The double concave design further enhances the divergence effect. At the same time, through precise surface control, it can effectively correct aberrations such as spherical aberration, coma and astigmatism from the original lens. The actual calculation results show that |f / f2| = 0.22, which is within the optimal range, indicating that this lens group can achieve ideal beam divergence control and aberration correction effects.

[0225] The third lens group 330 is mainly used for beam control and image reduction. Although its equivalent focal length is negative (f3 = -26.78mm), through the precise configuration of the object side concave surface and the image side convex surface, this lens group can achieve an optical effect similar to positive refractive power in a complex optical system. The ratio range of the relationship 0.4 <|f / f3| <0.6 ensures that the third lens group 330 can form an optical match with the front and rear lens groups, and realize the geometric reduction of the image plane through beam trajectory control. The actual calculation results show that |f / f3| = 0.48, which is in the center of the optimal range, indicating that the lens group can effectively balance the relationship between beam propagation and imaging quality, ensuring that excellent imaging performance is maintained while achieving a reduction ratio.

[0226] The fourth lens group 340 adopts a negative refractive power design (f4 = -294.86mm), forming a coordinated optical configuration with the third lens group 330. The relationship 0.03 < |f / f4| < 0.06 ensures that the fourth lens group 340 provides a moderate negative refractive power, which can effectively correct the system's residual aberrations without excessively diverging the light beam and affecting the final image quality. The actual calculation results in |f / f4| = 0.044, which is within the design range, indicating that this lens group can effectively perform its functions of aberration correction and image flattening. The object-side concave design helps control the propagation angle of the incident light beam, while the image-side spherical design can provide a gentle aberration correction effect, especially for controlling spherical aberration and coma.

[0227] The fifth lens group 350, the final adjustment component of the system, features a negative refractive power design that performs the critical tasks of beam shaping and final aberration correction. The geometric combination of convex and concave surfaces effectively corrects the system's remaining aberrations, particularly chromatic aberration, distortion, and astigmatism, ensuring image flatness and accurate color reproduction in the final image.

[0228] That is to say, the first and second lens groups are responsible for the initial divergence and aberration correction of the light beam, the third lens group 330 is the key beam control component, which realizes the main image plane reduction function through special optical design, and the fourth and fifth lens groups perform fine aberration correction and beam shaping.

[0229] See Figure 9 Optical simulation analysis confirmed that the optical adapter device of this embodiment exhibits excellent optical performance within a maximum viewing angle of 16 degrees. Field curvature analysis results show that sagittal field curvature is controlled within 0.0052mm and meridional field curvature is controlled within 0.0083mm, fully demonstrating the effectiveness of the refractive power configuration and conditional design of each lens group. The design ratio of |f / f2| = 0.22 for the second lens group 312 and |f / f3| = 0.48 for the third lens group 330 achieves smooth light beam transition and precise control of aberrations, bringing the image plane flatness of the entire system to professional-grade standards.

[0230] Distortion analysis results show that the system's maximum distortion is 2.0888%. This low distortion directly benefits from the fourth lens group 340's controlled |f / f4| = 0.044. This ratio ensures that the fourth lens group 340 effectively corrects the residual aberrations from the first three lens groups. The consistent field curvature performance across different wavelengths (0.6560μm, 0.5870μm, and 0.4860μm) also demonstrates the important role of the fifth lens group 350 in chromatic aberration correction, ensuring that the color reproduction capabilities of the professional lens are fully transmitted to the mobile phone sensor.

[0231] See Figure 7 In this embodiment, the second lens group 312 includes the following lenses arranged along the optical axis from the object side to the image side:

[0232] The first lens G1 has negative refractive power. The paraxial curvature radius of the object-side optical surface of the first lens G1 is R1, and the paraxial curvature radius of the image-side optical surface of the first lens G1 is R1a.

[0233] The second lens element G2 has negative refractive power. The paraxial curvature radius of the object-side optical surface of the second lens element G2 is R2, and the paraxial curvature radius of the image-side optical surface of the second lens element G2 is R2a. The following relationship is satisfied:

[0234] 1<|R1 / R1a|<1.4;

[0235] 0.2<|R2 / R2a|<0.4.

[0236] In this embodiment, the second lens group 312 is composed of a first lens G1 and a second lens group 312. Specific parameters are: the object-side optical surface curvature radius R1 of the first lens G1 is -31.32 mm, and the image-side optical surface curvature radius R1a is -22.69 mm; the object-side optical surface curvature radius R2 of the second lens G2 is -22.69 mm, and the image-side optical surface curvature radius R2a is 95.04 mm. Calculation of these parameters yields |R1 / R1a| = |-31.32 / (-22.69)| = 1.38, meeting the 11.4 range requirement; and |R2 / R2a| = |-22.69 / 95.04| = 0.24, meeting the 0.20.4 range requirement.

[0237] Conditional Equation 1 < |R1 / R1a| < 1.4. First lens G1, as the precursor component of second lens group 312, has a ratio of the curvature radii of its object-side and image-side surfaces that directly influences beam divergence and aberration correction. When the |R1 / R1a| ratio is controlled within the range of 1 to 1.4, first lens G1 exhibits moderate biconcave characteristics, with the absolute value of the curvature radius of the object-side surface slightly larger than that of the image-side surface. This asymmetric curvature distribution helps optimize the beam divergence angle. The actual parameter |R1 / R1a| = 1.38 is at the higher end of this range, indicating that the object-side surface of first lens G1 has a relatively gentle curvature, gently receiving the beam from first lens group 311 and avoiding excessively sharp beam deflection, thereby effectively controlling spherical aberration and coma. If the ratio is less than 1, the image-side curvature is too large, resulting in excessive beam divergence and worsening aberrations. If the ratio is greater than 1.4, the object-side curvature is too gentle, failing to provide sufficient divergence, affecting the optical performance of the entire system.

[0238] The conditional expression 0.2<|R2 / R2a|<0.4 is crucial to the optical performance of the second lens G2. The second lens G2 undertakes the main divergence function of the second lens group 312, and the ratio of the curvature radius of its object side and image side determines the final divergence state of the light beam. The actual parameter |R2 / R2a|=0.24 is at the lower end of the range, indicating that the image side of the second lens G2 has a relatively large curvature radius and exhibits a weak concave surface characteristic, while the object side maintains a strong concave surface characteristic. This design enables the second lens G2 to provide the necessary divergence function while controlling the degree of divergence of the light beam through the relatively flat design of the image side, avoiding the loss of light energy caused by excessive divergence. The ratio is controlled within the range of 0.2 to 0.4, ensuring that the second lens G2 can form a good optical match with the first lens G1 and achieve the optimal divergence effect of the entire second lens group 312.

[0239] The first lens G1 has negative values ​​of R1 = -31.32mm and R1a = -22.69mm, indicating a biconcave lens. However, the curvature radii of the two surfaces differ significantly, and this asymmetric design helps optimize the beam propagation path. The second lens G2 has an even more unique configuration of R2 = -22.69mm and R2a = 95.04mm. Its object-side surface has the same curvature radius as the image-side surface of the first lens G1, achieving a specific optical matching effect. The large curvature radius of the image-side surface (95.04mm) provides a relatively smooth beam exit condition.

[0240] Thus, the first lens G1 is primarily responsible for initial light beam divergence and initial aberration correction. Its moderate curvature ratio ensures a smooth transition of the light beam from the first lens group 311 to the second lens group 312. The second lens G2, on the other hand, performs the primary divergence function. Its small curvature radius ratio ensures that the light beam reaches the desired divergence state after passing through the second lens G2, providing suitable beam conditions for the subsequent third lens group 330. The curvature radius ratios of both lenses are controlled within their respective optimal ranges, ensuring that the entire second lens group 312 can achieve the desired optical function while maintaining good aberration correction.

[0241] The first lens element, G1, features a curvature ratio of |R1 / R1a| = 1.38, effectively controlling spherical aberration. The relatively gentle curvature of its object-side surface helps reduce high-order spherical aberration, while the stronger curvature of its image-side surface ensures necessary beam deflection. The second lens element, G2, features a curvature ratio of |R2 / R2a| = 0.24, primarily responsible for correcting coma and astigmatism. The strongly concave nature of its object-side surface effectively processes the beam from the first lens element, while the relatively gentle design of its image-side surface helps control coma.

[0242] See Figure 7 In this embodiment, the third lens group 330 includes the following lenses arranged along the optical axis from the object side to the image side:

[0243] The third lens G3 has positive refractive power, and its object-side optical surface is concave, and its image-side optical surface is convex.

[0244] The fourth lens element G4 has positive refractive power, and its object-side optical surface is flat, and its image-side optical surface is convex.

[0245] The object-side optical surface of the third lens element G3 has a paraxial curvature of R3, the image-side optical surface of the third lens element G3 has a paraxial curvature of R3a, and the image-side optical surface of the fourth lens element G4 has a paraxial curvature of R4a. The following relationship is satisfied:

[0246] 2.0<|R3 / R3a|<2.6;

[0247] 45<|R4a|<65.

[0248] In this embodiment, the third lens group 330 comprises a third lens G3 and a fourth lens G4. Specific parameters are: the object-side optical surface curvature radius R3 of the third lens G3 is -51.42 mm, and the image-side optical surface curvature radius R3a is 22.59 mm; the image-side optical surface curvature radius R4a of the fourth lens G4 is -54.47 mm. Calculation of these parameters yields |R3 / R3a| = |-51.42 / 22.59| = 2.28, meeting the 2.0-2.6 range requirement; and |R4a| = |-54.47| = 54.47, meeting the 45-65 range requirement.

[0249] The conditional equation 2.0 < |R3 / R3a| < 2.6 reflects the optical configuration of the third lens element G3 as a positive meniscus lens. The third lens element G3 adopts a meniscus design with a concave object-side surface (R3 = -51.42mm) and a convex image-side surface (R3a = 22.59mm). The actual parameter |R3 / R3a| = 2.28 is in the middle to high end of the range, indicating that the radius of curvature of the object-side concave surface of the third lens element G3 is approximately 2.28 times the radius of curvature of the image-side convex surface. This proportional relationship ensures that the lens can effectively control spherical aberration and coma while providing positive refractive power.

[0250] When the ratio is controlled within the range of 2.0 to 2.6, the third lens element G3 can achieve optimal beam convergence while maintaining good aberration correction performance. If the ratio is less than 2.0, the curvature of the object-side concave surface is too strong, resulting in excessive beam deflection and the generation of high-order spherical aberrations, affecting image quality. If the ratio is greater than 2.6, the object-side concave surface is relatively flat, unable to provide sufficient beam control capability, which may lead to a decrease in the overall optical performance of the system. The selection of the actual parameter of 2.28 reflects the precise balance between beam convergence and aberration control, ensuring that the third lens element G3 can achieve optimal optical performance in complex multi-group lens systems.

[0251] The fourth lens element, G4, features a flat object-side surface and a convex image-side surface. The flat object-side surface simplifies the beam's incidence, while the convex image-side surface performs the important functions of beam convergence and aberration correction. The actual parameter |R4a|=54.47 is midway between the two values, indicating that the image-side convex surface of G4 has a moderate curvature, providing the necessary positive refractive power while maintaining good aberration correction.

[0252] The radius of curvature is controlled within the range of 45 - 65 mm, ensuring that the fourth lens G4 can form a good optical cooperation with the third lens G3, achieving the optimal converging effect of the entire third lens group 330. The selection of the actual parameter 54.47 mm ensures that the fourth lens G4 can maintain excellent aberration correction performance while providing the necessary converging function.

[0253] In some embodiments, the length of the lens optical adapter device along the optical axis is L, the axial distance from the image-side optical surface of the second lens G2 to the object-side optical surface of the third lens G3 is T1, and the axial distance from the image-side optical surface of the third lens G3 to the object-side optical surface of the fourth lens G4 is T2, and the following relational expressions are satisfied:

[0254] 0.04 < T1 / L < 0.08;

[0255] 30 < T1 / T2 < 40.

[0256] In this embodiment, the conditional expression 0.04 < T1 / L < 0.08 controls the proportional relationship of the axial distance between the second lens group 312 and the third lens group 330 in the entire device length. When the T1 / L ratio is controlled within the range of 0.04 - 0.08, it not only ensures sufficient optical space when the light beam is converted from a negative refractive power system to a positive refractive power system, but also meets the compact design requirements of the entire device. Among them, the length L of the lens is 129.43, the axial distance T1 from the image-side optical surface of the second lens G2 to the object-side optical surface of the third lens G3 is 7.2, and T2 is 0.2. If the T1 / L ratio is less than 0.04, the distance between the second lens G2 and the third lens G3 is too small, and the light beam lacks sufficient propagation space during the conversion from a divergent state to a convergent state, which may lead to a sharp deflection of the light beam and deterioration of aberration. At the same time, it will also affect the overall focal length control of the optical system. If the T1 / L ratio is greater than 0.08, the distance between the lens groups is too large. Although it is beneficial to the smooth conversion of the light beam, it will increase the total length of the entire device, which is not conducive to compact design. At the same time, it may also affect the mechanical stability and manufacturing cost of the optical system.

[0257] Therefore, the conditional expression 30 < T1 / T2 < 40 controls the proportional relationship between the lens group distance and the internal lens distance. When the T1 / T2 ratio is controlled within the range of 30 - 40, it ensures sufficient space between the second lens group 312 and the third lens group 330 for the divergence-convergence conversion of the light beam, and at the same time guarantees the tight optical coupling of the lenses inside the third lens G3.

[0258] The larger T1 distance provides ample space for beam transitions, allowing the diverging beam from second lens group 312 to smoothly enter third lens group 330, avoiding aberrations caused by sudden changes in the beam. The relatively smaller T2 distance ensures close optical coordination between the two lenses within third lens group 330, enabling effective optical coupling between third lens G3 and fourth lens G4, and jointly achieving the overall optical function of third lens group 330.

[0259] Furthermore, the fourth lens group 340 includes, arranged along the optical axis from the object side to the image side, the following lenses:

[0260] The fifth lens element G5 has positive refractive power, and both its object-side and image-side optical surfaces are concave.

[0261] The sixth lens G6 has negative refractive power and a concave image-side surface.

[0262] The seventh lens element, G7, has positive refractive power, and both its object-side and image-side optical surfaces are convex.

[0263] The object-side optical surface of the fifth lens element G5 has a paraxial curvature radius of R5, and the image-side optical surface has a paraxial curvature radius of R5a; the image-side optical surface of the sixth lens element G6 has a paraxial curvature radius of R6a; the object-side optical surface of the seventh lens element G7 has a paraxial curvature radius of R7, and the image-side optical surface has a paraxial curvature radius of R7a, and the following relationship is satisfied:

[0264] 0.25<|R5 / R5a|<0.40; 1.7<|R7 / R7a|<2.1; |R6a–R7|<5.

[0265] In this embodiment, the fourth lens group 340 is composed of a fifth lens G5, a sixth lens G6, and a seventh lens G7. Specific parameters are as follows: the object-side optical surface of the fifth lens G5 has a curvature radius R5 of -33.80 mm, and a curvature radius R5a of the image-side optical surface of the fifth lens G5; the image-side optical surface of the sixth lens G6 has a curvature radius R6a of 60.12 mm; and the object-side optical surface of the seventh lens G7 has a curvature radius R7 of 60.12 mm, and a curvature radius R7a of the image-side optical surface of the seventh lens G7. Through actual parameter calculation, |R5 / R5a|=|-33.80 / (-100.72)|=0.34, which meets the 0.25-0.40 interval requirement; |R7 / R7a|=|60.12 / (-31.97)|=1.88, which meets the 1.72.1 interval requirement; |R6a-R7|=|60.12-60.12|=0, which meets the <5 requirement.

[0266] The conditional expression 0.25 < |R5 / R5a| < 0.40 reflects the optical design of the fifth lens element G5 as a positive biconcave lens. The actual parameter |R5 / R5a| = 0.34 is midway between these parameters. The object-side concave curvature of the fifth lens element G5 is significantly stronger than the image-side concave curvature. This asymmetric biconcave design provides excellent aberration correction capabilities within the optical system. The more strongly concave surface on the object side (R5 = -33.80mm) effectively receives the converging beam from the third lens group 330, while the less concave surface on the image side (R5a = -100.72mm) provides gentle beam regulation, ensuring smooth beam transfer to the sixth lens element G6.

[0267] When the ratio is controlled within the range of 0.25 to 0.40, the fifth lens element G5 can effectively control spherical aberration and coma while providing the necessary positive refractive power. If the ratio is less than 0.25, the curvature difference between the object-side concave surface and the image-side concave surface is too small, failing to provide sufficient aberration correction. If the ratio is greater than 0.40, the object-side concave surface is too strong, resulting in excessive beam deflection and the generation of higher-order aberrations. The actual parameter of 0.34 ensures that the fifth lens element G5 can achieve optimal aberration correction in complex multi-group lens systems.

[0268] The conditional expression 1.7 < |R7 / R7a| < 2.1 is crucial to the optical performance of the seventh lens element G7. The seventh lens element G7 adopts a biconvex design, assuming the primary convergence function and final aberration correction of the fourth lens group 340. The actual parameter |R7 / R7a| = 1.88 is midway between these values. The object-side convex curvature of the seventh lens element G7 is moderate, while the image-side convex curvature is relatively strong. The seventh lens element G7 is able to provide the necessary convergence while achieving precise aberration correction through its more strongly convex image-side surface.

[0269] The curvature radius ratio is controlled within the range of 1.7 to 2.1 to ensure optimal optical coordination between the seventh lens element, G7, and the preceding fifth and sixth lenses, G6. If the ratio is less than 1.7, the image-side convex surface becomes too strong, leading to excessive beam convergence and aberration degradation. If the ratio is greater than 2.1, the image-side convex surface becomes too flat, failing to provide adequate aberration correction. The choice of a parameter of 1.88 reflects a precise balance between beam convergence and aberration control.

[0270] The conditional |R6a–R7| < 5 demonstrates the optical matching between the sixth and seventh lens elements G6 and G7. The actual parameters show that R6a = 60.12 mm and R7 = 60.12 mm are exactly the same, and |R6a-R7| = 0. This perfect matching of the curvature radii ensures a smooth transition of the light beam from the image side of the sixth lens element G6 to the object side of the seventh lens element G7, eliminating unnecessary beam deflection and interface reflection losses.

[0271] Combined with the previous optical simulation analysis, the design of the fourth lens group 340 fully reflects its important role in the entire system. The excellent image plane flatness shown in the field curvature diagram (sagittal field curvature < 0.01 mm) and the good light convergence characteristics shown in the ray fan diagram are both closely related to the precise design of the fourth lens group 340.

[0272] Through the control of three conditional expressions and the coordinated cooperation of three lenses, the fourth lens group 340 has successfully achieved effective correction of the remaining aberrations of the previous lens group, ensuring that the excellent optical performance of the professional lens can be completely transmitted to the mobile phone sensor, providing a solid technical foundation for the perfect integration of professional photography and mobile photography.

[0273] Furthermore, in the embodiment, the paraxial distance from the image-side optical surface of the fourth lens G4 to the object-side optical surface of the fifth lens G5 is T3, and the paraxial distance from the image-side optical surface of the fifth lens G5 to the object-side optical surface of the sixth lens G6 is T4, and the following relational expressions are satisfied:

[0274] 5.5 < T3 / T4 < 6.5;

[0275] 0.05 < T3 / L < 0.08;

[0276] 0.008 < T4 / L < 0.015;

[0277] 0.55 < T3 / f < 0.75.

[0278] The limitation of the conditional expression 5.5 < T3 / T4 < 6.5 in this embodiment reflects the spatial distribution strategy of different functional regions inside the fourth lens group 340. The ratio of T3 / T4 = 6.06 indicates that the distance between the fourth lens G4 and the fifth lens G5 is about 6 times the distance between the fifth lens G5 and the sixth lens G6. This significant spatial difference reflects the different spatial requirements of different optical conversion processes. The larger T3 distance provides sufficient space for the conversion of the light beam from the third lens group 33 to the fourth lens group 340, enabling the light beam to reach an appropriate divergence state before entering the fourth lens group 340. The smaller T4 distance ensures the close optical coupling of the lenses inside the fourth lens group 340, enabling the fifth lens G5 and the sixth lens G6 to form an effective optical cooperation.

[0279] The design of the conditional expression 0.55 < T3 / f < 0.75 establishes a direct proportional relationship between the entrance spacing of the fourth lens group 340 and the system focal length. The actual parameter of T3 / f = 0.65 indicates that the entrance spacing of the fourth lens group 340 is about 65% of the system focal length. This design ensures the coordination and unity of the spatial configuration and optical performance. Controlling this ratio within the range of 0.55 - 0.75 not only ensures sufficient space for beam conversion but also maintains the compact design of the system.

[0280] The collaborative limitation of the conditional expressions 0.05 < T3 / L < 0.08 and 0.008 < T4 / L < 0.015 ensures that the axial distance of the fourth lens group 340 occupies a reasonable proportion in the overall system length. This hierarchical spatial control strategy not only optimizes the optical performance but also provides ideal geometric conditions for the three-lens collaborative design of the fourth lens group 340. The relatively large proportion of T3 in the total length ensures sufficient space for the beam state conversion, while the relatively small proportion of T4 guarantees a tight fit within the lens group.

[0281] The T3 / T4 conditional expression controls the internal spatial distribution of the lens group from the perspective of local functions. The T3 / f conditional expression establishes the correlation between space and optical performance from the perspective of the overall system, while the T3 / L and T4 / L conditional expressions control the utilization efficiency of space from the perspective of structural compactness.

[0282] The multi-level spatial control strategy ensures that the fourth lens group 340 can achieve optimal optical performance within a limited space. Through axial distance control, the three lenses of the fourth lens group 340 can achieve the best optical effects in their respective functional regions while maintaining the structural compactness and manufacturing feasibility of the entire system.

[0283] Refer to Table 1 below for further reference.

[0284]

[0285]

[0286] Table 1

[0287] Refer to Figures 10 to 12 The present invention further provides a lens optical adapter device, which, arranged along the optical axis from the object side to the image side in sequence, includes:

[0288] The first lens group 311, including a first lens G1 with negative refractive power and a second lens G2. The image-side optical surface of the first lens G1 is convex in the paraxial region, and the object-side optical surface and the image-side optical surface of the second lens G2 are concave in the paraxial region;

[0289] The second lens group 312, including a third lens G3 with negative refractive power and a fourth lens G4. The object-side optical surface and the image-side optical surface of the third lens G3 are concave in the paraxial region, and the image-side optical surface of the fourth lens G4 is convex in the paraxial region;

[0290] The third lens group 330, including a fifth lens G5 with negative refractive power and a sixth lens G6. The object-side optical surface and the image-side optical surface of the fifth lens G5 are concave in the paraxial region, and the object-side optical surface and the image-side optical surface of the sixth lens G6 are spherical in the paraxial region;

[0291] The fourth lens group 340 includes a seventh lens element G7, an eighth lens element G8, a ninth lens element G9, and a tenth lens element G10, all of which have positive refractive power. The object-side optical surface of the seventh lens G7 is convex on the paraxial direction. The object-side optical surfaces and image-side optical surfaces of the eighth lens G8 and the ninth lens G9 are both concave on the paraxial direction. The object-side optical surface and image-side optical surface of the tenth lens G10 are both convex on the paraxial direction.

[0292] The fifth lens group 350 includes an eleventh lens G11 and a twelfth lens G12, both having positive refractive power. The object-side optical surface of the eleventh lens G11 is convex on the paraxial direction, the object-side optical surface of the twelfth lens G12 is spherical on the paraxial direction, and the image-side optical surface is concave. The effective focal length of the lens optical adapter is f10, the effective focal length of the first lens group 311 is f11, the effective focal length of the second lens group 312 is f12, the effective focal length of the third lens group 330 is f13, and the effective focal length of the fourth lens group 340 is f14, and the following relationship is satisfied:

[0293] 140 <f11 / f10<150;

[0294] 7.5 <f12 / f10<8.5;

[0295] 4.2 <f13 / f10<4.8;

[0296] 270 <f14 / f10<290。

[0297] In this embodiment, the optical parameters are as follows: the effective focal length f10 of the lens optical adapter is 12.0 mm, the effective focal length f11 of the first lens group 311 is 1716.57 mm, the effective focal length f12 of the second lens group 312 is 92.91 mm, the effective focal length f13 of the third lens group 330 is 53.09 mm, the effective focal length f14 of the fourth lens group 340 is 3324.43 mm, and the effective focal length f15 of the fifth lens group 350 is 46.16 mm.

[0298] The design of the focal length ratio f11 / f10=143.05 of the first lens group 311 reflects the control of the ultra-long focal length negative refractive power component. The extremely high focal length ratio (approximately 143 times the focal length of the system) ensures that the first lens group 311 has extremely weak negative refractive power. Its main function is to gently receive the output light beam of the professional lens to avoid introducing too many primary aberrations. If the ratio is lower than 140, the negative refractive power of the first lens group 311 is relatively too strong, which will cause excessive divergence of the light beam and affect the working efficiency of the subsequent lens group; if the ratio is higher than 150, the refractive power of the first lens group 311 is too weak to provide the necessary beam control function, which may lead to a decline in the overall performance of the system. The actual parameter 143.05 is in the ideal position of the range, ensuring the optimal optical performance of the incident end of the system.

[0299] The focal length ratio of the second lens group 312, f12 / f10 = 7.74, reflects moderate negative refractive power. This lens group is responsible for initial beam divergence and pre-correction of aberrations, with a refractive power of approximately 1 / 7.74 of the system's refractive power. This moderate negative refractive power effectively expands the beam angle, facilitating subsequent image reduction, while also preventing light energy loss due to excessive divergence. Controlling this ratio within the range of 7.5 to 8.5 ensures that the second lens group 312 achieves an optimal balance between beam divergence and aberration control.

[0300] The focal length ratio of third lens group 330, f13 / f10 = 4.42, indicates relatively strong negative refractive power, approximately 1 / 4.42 of the system's refractive power. As the final lens group in a negative refractive power system, third lens group 330 must complete the final adjustment of beam divergence to prepare for the transition to positive refractive power in fourth lens group 340. Controlling this ratio within the range of 4.2 to 4.8 ensures sufficient beam divergence while preventing excessive divergence from impacting system stability.

[0301] The fourth lens group 340 is primarily responsible for finely controlling and aberration-correcting the complex light beam generated by the first three lens groups. The ratio is controlled within the range of 270 to 290, ensuring that the fourth lens group 340 can precisely control the light beam without introducing significant aberrations.

[0302] In this embodiment, the first three groups of negative refractive power lenses achieve progressive divergence of the light beam, with their focal length ratios showing a decreasing trend (143.05 → 7.74 → 4.42), reflecting the gradual increase in refractive power. This ensures that the light beam can smoothly transition from a receiving state to a diverging state, avoiding abrupt optical changes. The positive refractive power configuration of the fourth and fifth lens groups is responsible for the reconvergence of the light beam and the final imaging. The ultra-long focal length design of the fourth lens group 340 is primarily responsible for precise control, while the moderate focal length of the fifth lens group 350 is responsible for the final imaging function.

[0303] In some embodiments, the object-side optical surface of the third lens element G3 has a paraxial curvature radius of R8, the image-side optical surface of the third lens element G3 has a paraxial curvature radius of R8a, and the image-side optical surface of the fourth lens element G4 has a paraxial curvature radius of R13, and the following relationship is satisfied:

[0304] 0.8<|R8 / R8a|<1.0;

[0305] 1.8<|R8a / R13|<2.3;

[0306] 45<|R8|<85.

[0307] In this embodiment, the optical data are: R8=65.68 mm, R8a=74.88 mm, R13=-34.83 mm.

[0308] |R8 / R8a|=|65.68 / 74.88|=0.88, which meets the requirement of 0.8~1.0;

[0309] |R8a / R13|=|74.88 / (-34.83)|=2.15, meeting the requirement of 1.8~2.3 range;

[0310] |R8|=|65.68|=65.68, which meets the requirement of 45~85;

[0311] The conditional equation 0.8 < |R8 / R8a| < 1.0 controls the curvature ratio of the two optical surfaces of the third lens element G3. The actual parameter of 0.88 ensures a moderate surface shape difference, which is beneficial for aberration correction. The conditional equation 1.8 < |R8a / R13| < 2.3 establishes a curvature matching relationship between the third lens element G3 and the fourth lens element G4. The actual parameter of 2.15 ensures good optical connection. The conditional equation 45 < |R8| < 85 limits the curvature range of the object side surface. The actual parameter of 65.68mm provides suitable beam control capabilities.

[0312] In some embodiments, the fifth lens element G5 has negative refractive power, the object-side optical surface of the fifth lens element G5 has a paraxial curvature radius of R9, and the image-side optical surface of the fifth lens element G5 has a paraxial curvature radius of R9a; the sixth lens element G6 has positive refractive power, the object-side optical surface of the sixth lens element G6 has a paraxial curvature radius of R10, and the image-side optical surface of the sixth lens element G6 has a paraxial curvature radius of R10a, and the following relationship is satisfied:

[0313] 6.0<|R9 / R9a|<7.0;

[0314] 0.7<|R10 / R10a|<0.9;

[0315] |R9a–R10|<1.0.

[0316] In this embodiment, the conditional equation 6.0 < |R9 / R9a| < 7.0 controls the curvature ratio of the fifth lens element G5. The actual parameter 6.57 ensures moderate surface profile variation for a negative refractive power lens, facilitating beam divergence and aberration correction. The conditional equation 0.7 < |R10 / R10a| < 0.9 defines the curvature configuration of the sixth lens element G6. The actual parameter 0.755 ensures excellent optical performance for a positive refractive power lens.

[0317] The conditional expression |R9a–R10| < 1.0 reflects the matching degree between the fifth lens G5 and the sixth lens G6. The actual parameters show that R9a and R10 are exactly equal (37.221 mm), ensuring a smooth transition of the light beam between the two lenses, eliminating the interface reflection loss, and reflecting the high-precision optical design concept. The conditional expression 25 < |R9| + |R10a| < 35 is used to control the overall curvature distribution of the system.

[0318] In some embodiments, the distance from the image-side optical surface of the sixth lens G6 to the object-side optical surface of the seventh lens G7 is T5, and the following relational expressions are satisfied:

[0319] 0.025 < T5 / L < 0.035;

[0320] 0.25 < T5 / f < 0.35;

[0321] 1.8 < T1 / T5 < 2.2;

[0322] 3.0 < T5 < 4.5.

[0323] The optical parameter is: T5 = 3.850 mm.

[0324] The conditional expression 3.0 < T5 < 4.5 directly defines the axial distance between the sixth lens G6 and the seventh lens G7. The actual parameter of T5 = 3.850 mm is in the upper-middle position of the interval, ensuring an appropriate optical space between the two lenses for beam control. This distance setting provides sufficient space for the conversion of the light beam from the third lens group 330 to the fourth lens group 340. [[ID=2…]]

[0325] The conditional expression 0.025 < T5 / L < 0.035 controls the proportional relationship of the T5 distance in the overall system length. This relatively small ratio ensures the compact design of the system while providing the necessary space for the key optical conversion area. This ratio range reflects the precise control of space utilization. …

[0326] The conditional expression 0.25 < T5 / f < 0.35 establishes a direct relationship between the axial distance and the system focal length, reflecting the coordination and unity of space configuration and optical performance. This ratio control ensures that the T5 distance can adapt to the optical requirements of the system and maintain the best optical performance.

[0327] The conditional expression 1.8 < T1 / T5 < 2.2 reflects the proportional relationship of the distances between different lens groups. This ratio control reflects the space allocation strategy of different functional areas in the optical system. By controlling the ratio of T1 to T5, it ensures that each optical area can obtain an appropriate working space.

[0328] Refer to Figure 10In this embodiment, the object-side optical surface of the seventh lens element G7 has a paraxial curvature radius of R11, and the image-side optical surface has a paraxial curvature radius of R11a. The object-side optical surface of the eighth lens element G8 has a paraxial curvature radius of R12, and the image-side optical surface has a paraxial curvature radius of R12a. The following relationship is satisfied:

[0329] 0.15<|R11 / R11a|<0.20;

[0330] 0.75<|R12 / R12a|<0.95.

[0331] In this embodiment, the optical data are: R11=64.913 mm, R11a=388.654 mm, R12=-37.944 mm, R12a=46.342 mm.

[0332] Calculated by actual parameters:

[0333] |R11 / R11a|=|64.913 / 388.654|=0.167, meeting the 0.15~0.20 range requirement;

[0334] |R12 / R12a|=|-37.944 / 46.342|=0.819, meeting the 0.75~0.95 range requirement;

[0335] The conditional equation 0.15 < |R11 / R11a| < 0.20 controls the curvature ratio configuration of seventh lens element G7. The actual parameter of 0.167 indicates that the object-side optical surface of seventh lens element G7 has a relatively strong curvature, while the image-side optical surface is relatively flat. This ensures that seventh lens element G7 can effectively perform beam steering in fourth lens group 340. The strong curvature of the object-side surface helps receive the light beam from third lens group 330, while the flat design of the image-side surface facilitates smooth beam transmission.

[0336] The conditional expression 0.75 < |R12 / R12a| < 0.95 defines the curvature configuration of the eighth lens element G8. The actual parameter of 0.819 falls in the middle of this range, indicating a relatively balanced curvature distribution across the two optical surfaces of the eighth lens element G8. This design enables the eighth lens element G8 to assume the important role of aberration correction in the fourth lens group 340, effectively controlling aberrations such as spherical aberration and coma through a moderate curvature ratio.

[0337] The curvature radii of the seventh and eighth lenses, G7 and G8, reflect the precise optical design within fourth lens group 340. Seventh lens G7 achieves preliminary beam control with a curvature ratio of 0.167, while eighth lens G8 achieves fine aberration correction with a curvature ratio of 0.819. The synergistic effect of these two lenses ensures that fourth lens group 340 achieves optimal performance in beam convergence and aberration control, providing a crucial guarantee for the superior performance of the entire optical adapter.

[0338] Please refer to Table 2 below.

[0339]

[0340]

[0341] Table 2

[0342] The present invention further provides a mobile phone protective case 100, which includes the lens optical adapter 300 of the aforementioned embodiment. The specific structure of the lens optical adapter 300 is similar to that of the aforementioned embodiment. Since the mobile phone protective case 100 utilizes all the technical solutions of all the aforementioned embodiments, it at least has all the technical effects brought about by the technical solutions of the aforementioned embodiments, and a detailed description thereof will not be repeated here. The mobile phone protective case 100 includes a first mounting portion 101 and a second mounting portion 102. The first mounting portion 101 is used to fit a mobile phone, and the second mounting portion 102 is connected to the second end 301b of the lens barrel 301 via threads or a snap-fit ​​connection.

[0343] See Figure 6 In this embodiment, the mobile phone protective case 100 comprises two main parts: a first mounting portion 101 and a second mounting portion 102. The first mounting portion 101 is designed as a housing structure that fits over the mobile phone, securely housing and protecting it while ensuring normal operation and use. The second mounting portion 102 is specifically designed to connect to the second end 301b of the lens barrel 301, supporting a quick and secure connection via threads or snaps.

[0344] This allows users to easily connect and use a professional lens while protecting their phone. When taking professional photos, users simply connect the professional camera lens 500 to the first end 301a of the lens barrel 301 via the lens adapter ring 200, and then connect the second end 301b of the lens barrel 301 to the second mounting portion 102 of the phone protective case 100. The entire system is easy to assemble and intuitive to operate, eliminating the need for complex debugging.

[0345] Because this mobile phone protective case 100 utilizes all the technical solutions of the aforementioned embodiments, it inherits all the technical advantages and effects of the aforementioned optical adapters, including perfect optical matching between professional lenses and mobile phone cameras, high-quality imaging, and effective control of various aberrations. This enables mobile phones equipped with this protective case to achieve photography effects close to those of professional cameras, greatly expanding the application scenarios and creative possibilities of mobile phone photography.

[0346] The present invention further provides a mobile phone high-definition photography system, comprising a mobile phone, a camera lens 500, and the mobile phone protective case 100 of the aforementioned embodiment.

[0347] Continue reading Figure 6 In this embodiment, the mobile phone high-definition photography system includes three core components: a mobile phone, a camera lens 500, and the mobile phone protective case 100 (which incorporates the lens optical adapter 300) described in detail in the previous embodiment. These three components work together to form a fully functional, high-quality photography system.

[0348] The mobile phone serves as the core computing and display platform for the entire system, providing basic functions such as image processing, storage, preview, and sharing. The system is designed to be compatible with mainstream smartphone models on the market, meeting the needs of most users.

[0349] The camera lens 500 system fully leverages existing professional photography resources, and is compatible with a wide range of professional camera lenses of various brands and specifications, including but not limited to common wide-angle, standard, telephoto, and macro lenses. This open and compatible design concept allows users to flexibly select the most appropriate lens for different shooting scenarios, greatly expanding the expressiveness and creative space of mobile photography.

[0350] The mobile phone protective case 100 (including the lens optical adapter 300) is the key bridge connecting the mobile phone and the professional lens. Through the precisely designed optical system, it solves the optical matching problem between the two and ensures the high quality and stability of imaging.

[0351] When these three components are used together, users simply install their phone in the protective case, connect the desired professional lens to the system via an adapter, and start shooting. The entire system is compact and lightweight, easy to carry, and simple and intuitive to operate.

[0352] Through this highly integrated system design, professional photography technology is brought to the mobile device field, providing users with a photography experience close to that of professional cameras.

[0353] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A lens optical adapter device, used in a mobile phone high-definition shooting system, wherein the mobile phone high-definition shooting system includes a mobile phone protective case, and the mobile phone protective case is used to install the mobile phone, characterized in that: The lens optical switching device comprises: a lens barrel having a first end and a second end opposite to each other, the first end being adapted to be detachably connected to the camera lens, and the second end being adapted to be detachably connected to the mobile phone protective case; a first lens unit disposed in the lens barrel, wherein the object side surface of the first lens unit is a flat surface, and the image side surface of the first lens unit is a convex surface; The second lens unit is disposed in the lens barrel and spaced apart from the first lens unit. The object side surface of the second lens unit is a flat surface, and the image side surface of the second lens unit is a concave surface.

2. The lens optical adapter device according to claim 1, wherein: The first lens unit and the second lens unit are sequentially spaced apart along a first direction; The first lens unit includes: a first lens group, the first lens group having positive optical power, the object-side surface of the first lens assembly being flat, and the image-side surface of the first lens assembly being convex; a second lens group, disposed on the image-side surface of the first lens group and spaced apart from the first lens group, the second lens group having negative optical power, the object-side surface of the second lens group being concave, and the image-side surface of the second lens group being convex; The second lens unit includes: a third lens group, the third lens group having positive refractive power, the object-side surface of the third lens group being a flat surface, and the image-side surface of the third lens group being a convex surface; a fourth lens group, the fourth lens group having positive refractive power, the object-side surface of the fourth lens group being a convex surface, and the image-side surface of the fourth lens group being a flat surface; The fifth lens group, the second lens group has negative optical power, the object side surface of the fifth lens group is convex, and the image side surface of the fifth lens group is concave.

3. The lens optical adapter device according to claim 2 or 1, characterized in that: The first lens unit is composed of two lens groups, and the second lens unit is composed of three lens groups; The total number of lenses in the first lens unit and the second lens unit is five; or the total number of lenses in the first lens unit and the second lens unit is eleven.

4. The lens optical adapter device according to claim 2, wherein: The first lens group includes a first lens, a second lens, a third lens, and a fourth lens, arranged in order from the object side to the image side; The object side surface of the first lens is a plane, and the image side surface is a convex surface with a curvature radius of R1; The object side surface of the second lens is a concave surface with a curvature radius of R2, and the image side surface is a convex surface with a curvature radius of R3; The object side surface of the third lens is a concave surface with a curvature radius of R4, and the image side surface is a flat surface; The object side surface of the fourth lens is a concave surface with a curvature radius of R5, and the image side surface is a convex surface with a curvature radius of R6; The first lens, the second lens, the third lens and the fourth lens are arranged closely in sequence; the effective optical diameters of the first lens, the second lens, the third lens and the fourth lens are OD1 <OD2<OD3<OD4。 5. The lens optical adapter device according to claim 4, wherein: The second lens group includes a fifth lens, and the fifth lens is spaced apart from the fourth lens; The object side surface of the fifth lens is a concave surface with a curvature radius of R7, the image side surface is a convex surface with a curvature radius of R8, and the effective optical diameter of the fifth lens is OD5, and OD5>OD4.

6. The lens optical adapter device according to claim 5, wherein: The third lens group includes a sixth lens, a seventh lens, and an eighth lens arranged in order from the object side to the image side; The object side surface of the sixth lens is a plane, and the image side surface is a concave surface with a curvature radius of R9; the effective optical diameter of the sixth lens is OD6; The object side surface of the seventh lens is a flat surface, and the image side surface is a concave surface with a curvature radius of R10; the effective optical diameter of the seventh lens is OD7, and OD7 is equal to OD6; The object-side surface of the eighth lens is a convex surface with a curvature radius of R11, the image-side surface is a convex surface with a curvature radius of R12, and the effective optical diameter of the eighth lens is OD8, ​​and OD8 is equal to OD7; The object-side surface of the sixth lens is spaced apart from the image-side surface of the fifth lens, and the sixth lens, the seventh lens and the eighth lens are closely attached to each other.

7. The lens optical adapter device according to claim 6, wherein: The fourth lens group includes a ninth lens. The object-side surface of the ninth lens is a convex surface with a curvature radius of R13. The image-side surface of the ninth lens is a flat surface. The object-side surface of the ninth lens is in close contact with the image-side surface of the eighth lens. The effective optical diameter of the ninth lens is smaller than the effective optical diameter of the eighth lens.

8. The lens optical adapter device according to claim 2, wherein: The fifth lens group is a cemented lens, the object side surface of the cemented lens is convex, the image side surface of the cemented lens is concave, and the cemented lens is configured to focus the light beams on the same plane. The effective optical diameter of the fifth lens group is smaller than the effective optical diameter of the fourth lens group.

9. A lens optical adapter device, characterized in that: The lens system comprises a lens barrel and a lens group disposed in the lens barrel, wherein the lens group is arranged along the optical axis from the object side to the image side and comprises: a first lens group, wherein the first lens group has negative refractive power and an image-side optical surface thereof is a concave surface; a second lens group, the second lens group having negative refractive power, wherein both the object-side optical surface and the image-side optical surface of the second lens group are concave surfaces; a third lens group, the third lens group having positive refractive power, a concave object-side optical surface, and a convex image-side optical surface; a fourth lens group having negative refractive power, a concave object-side optical surface, and a spherical image-side optical surface; a fifth lens group having negative refractive power, a convex object-side optical surface, and a concave image-side optical surface; The focal length of the lens optical adapter is f, the effective focal length of the second lens group is f2, the effective focal length of the third lens group is f3, and the effective focal length of the fourth lens group is f4, and the following relationship is satisfied: 0.1<|f / f2|<0.3; 0.4<|f / f3|<0.6; 0.03<|f / f4|<0.

06.

10. The lens optical adapter device according to claim 9, wherein: The second lens group is arranged along the optical axis from the object side to the image side and includes: A first lens having negative refractive power, wherein the curvature radius of the object-side optical surface of the first lens on the paraxial axis is R1, and the curvature radius of the image-side optical surface of the first lens on the paraxial axis is R1a; The second lens element has negative refractive power, the curvature radius of the object-side optical surface of the second lens element on the paraxial axis is R2, the curvature radius of the image-side optical surface of the second lens element on the paraxial axis is R2a, and the following relationship is satisfied: 1<|R1 / R1a|<1.4; 0.2<|R2 / R2a|<0.

4.

11. The lens optical adapter device according to claim 10, wherein: The third lens group is arranged along the optical axis from the object side to the image side and includes: a third lens having positive refractive power, wherein the object-side optical surface of the third lens is concave and the image-side optical surface is convex; a fourth lens element having positive refractive power, wherein the object-side optical surface of the fourth lens element is flat, and the image-side optical surface of the fourth lens element is convex; The object-side optical surface of the third lens has a paraxial curvature of R3, the image-side optical surface of the third lens has a paraxial curvature of R3a, and the image-side optical surface of the fourth lens has a paraxial curvature of R4a, and the following relationship is satisfied: 2.0<|R3 / R3a|<2.6; 45<|R4a|<65.

12. The lens optical adapter device according to claim 11, wherein: The length of the lens optical adapter along the optical axis is L, the axial distance from the image-side optical surface of the second lens to the object-side optical surface of the third lens is T1, and the axial distance from the image-side optical surface of the third lens to the object-side optical surface of the fourth lens is T2, and the following relationship is satisfied: 0.04 <T1 / L<0.08; 30 <T1 / T2<40。 13. The lens optical adapter device according to claim 11, wherein: The fourth lens group comprises, arranged along the optical axis from the object side to the image side, the following lens groups: The fifth lens element has positive refractive power, and both its object-side optical surface and image-side optical surface are concave; The sixth lens element has negative refractive power and its image-side surface is concave; The seventh lens element has positive refractive power, and both its object-side optical surface and image-side optical surface are convex; The object-side optical surface of the fifth lens has a paraxial curvature radius of R5, and the image-side optical surface has a paraxial curvature radius of R5a; the image-side optical surface of the sixth lens has a paraxial curvature radius of R6a; the object-side optical surface of the seventh lens has a paraxial curvature radius of R7, and the image-side optical surface has a paraxial curvature radius of R7a, and the following relationship is satisfied: 0.25<|R5 / R5a|<0.40; 1.7<|R7 / R7a|<2.1; |R6a–R7|<5; 15<|f567 / f|<30.

14. The lens optical adapter device according to claim 13, wherein: The paraxial distance between the image-side optical surface of the fourth lens and the object-side optical surface of the fifth lens is T3, and the paraxial distance between the image-side optical surface of the fifth lens and the object-side optical surface of the sixth lens is T4, and the following relationship is satisfied: 5.5 <T3 / T4<6.5; 0.05 <T3 / L<0.08; 0.008 <T4 / L<0.015; 0.55 <T3 / f<0.75。 15. A lens optical adapter device, characterized in that: Arranged along the optical axis from the object side to the image side, they include: The first lens group includes a first lens having negative refractive power and a second lens, wherein the image-side optical surface of the first lens is convex on the paraxial direction, and the object-side optical surface and the image-side optical surface of the second lens are both concave on the paraxial direction; The second lens group includes a third lens and a fourth lens having negative refractive power, wherein the object-side optical surface and the image-side optical surface of the third lens are both concave surfaces on the paraxial direction, and the image-side optical surface of the fourth lens is convex on the paraxial direction; a third lens group including a fifth lens element and a sixth lens element having negative refractive power, wherein the object-side optical surface and the image-side optical surface of the fifth lens element are both concave surfaces on the paraxial direction, and the object-side optical surface and the image-side optical surface of the sixth lens element are both spherical surfaces on the paraxial direction; a fourth lens group comprising a seventh lens element, an eighth lens element, a ninth lens element, and a tenth lens element, each having positive refractive power; the object-side optical surface of the seventh lens element is convex on the paraxial direction; the object-side optical surfaces and image-side optical surfaces of the eighth lens element and the ninth lens element are both concave on the paraxial direction; and the object-side optical surface and image-side optical surface of the tenth lens element are both convex on the paraxial direction; A fifth lens group includes an eleventh lens and a twelfth lens having positive refractive power, wherein the object-side optical surface of the eleventh lens is convex on the paraxial direction, the object-side optical surface of the twelfth lens is spherical on the paraxial direction, and the image-side optical surface is concave, wherein the effective focal length of the lens optical adapter device is f10, the effective focal length of the first lens group is f11, the effective focal length of the second lens group is f12, the effective focal length of the third lens group is f13, and the effective focal length of the fourth lens group is f14, and the following relationship is satisfied: 140 <f11 / f10<150; 7.5 <f12 / f 10<8.5; 4.2 <f13 / f10<4.8; 270 <f14 / f10<290。 16. The lens optical adapter device according to claim 15, wherein: The object-side optical surface of the third lens has a paraxial curvature radius of R8, the image-side optical surface of the third lens has a paraxial curvature radius of R8a, and the image-side optical surface of the fourth lens has a paraxial curvature radius of R13, and the following relationship is satisfied: 0.8<|R8 / R8a|<1.0; 1.8<|R8a / R13|<2.3; |R8+R8a|<15; 45<|R8|<85。 17. The lens optical adapter device according to claim 15, wherein: The fifth lens element has negative refractive power, the object-side optical surface of the fifth lens element has a paraxial curvature radius of R9, and the image-side optical surface of the fifth lens element has a paraxial curvature radius of R9a; the sixth lens element has positive refractive power, the object-side optical surface of the sixth lens element has a paraxial curvature radius of R10, and the image-side optical surface of the sixth lens element has a paraxial curvature radius of R10a, and the following relationship is satisfied: 6.0<|R9 / R9a|<7.0; 0.7<|R10 / R10a|<0.9; |R9a–R10|<1.0; 25<|R9|+|R10a|<35.

18. The lens optical adapter device according to claim 17, wherein: The distance between the image-side optical surface of the sixth lens and the object-side optical surface of the seventh lens is T5, and satisfies the following relationship: 0.025 <T5 / L<0.035; 0.25 <T5 / f<0.35; 1.8 <T1 / T5<2.2; 3.0<T5<4.5。 19. The lens optical adapter device according to claim 15, wherein: The object-side optical surface of the seventh lens element has a curvature radius R11 on the paraxial axis, and the image-side optical surface has a curvature radius R11a on the paraxial axis. The object-side optical surface of the eighth lens element has a curvature radius R12 on the paraxial axis, and the image-side optical surface has a curvature radius R12a on the paraxial axis, and the following relationship is satisfied: 0.15<|R11 / R11a|<0.20; 0.75<|R12 / R12a|<0.

95.

20. A mobile phone protective case, characterized in that: It comprises a lens optical adapter device as described in any one of claims 1 to 19, wherein the mobile phone protective shell comprises a first mounting portion and a second mounting portion, the first mounting portion is used to fit the mobile phone, and the second mounting portion is connected to the second end of the lens barrel by a thread or a snap.

21. A mobile phone high-definition shooting system, comprising a mobile phone and a camera lens, characterized in that: Also included is the mobile phone protective case as claimed in claim 20.

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