Long-focus mobile phone lens

Abstract

The invention discloses a long-focus mobile phone lens. The long-focus mobile phone lens sequentially comprises a prism and a lens assembly from an object side to an image side, the prism comprises an incident surface, a reflecting surface and an emergent surface; the lens assembly has positive focal power, the first lens has positive focal power, and the first lens is the lens closest to the object side in the lens assembly; the entrance pupil diameter dP of the long-focus mobile phone lens and the maximum aperture dMax of the waist part of the lens assembly meet the following conditions: 0.825 lt; dP / dMaxlt; and 0.863%. According to the long-focus mobile phone lens, a large aperture can be realized, the local aperture of the lens is relatively small, the miniaturization of the lens is facilitated, and the thickness of a mobile phone is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging, and in particular to a telephoto mobile phone lens. Background Art

[0002] The telephoto lens of a mobile phone has a long focal length, which results in a long total optical length, making it difficult to miniaturize the lens. In order to reduce the thickness of the mobile phone, the telephoto lens is usually installed horizontally in the mobile phone. As a result, the factor affecting the thickness of the mobile phone changes from the original optical length to the size of the aperture. However, in order to meet the requirements for the amount of light entering, a large aperture is usually adopted, which will lead to a larger lens aperture and a corresponding increase in the thickness of the mobile phone. Therefore, a solution that can achieve both the requirements of a large aperture and a small aperture is needed to solve this problem. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a telephoto mobile phone lens that can achieve a large aperture while having a small local aperture of the lens, which is conducive to the miniaturization of the lens and further reduces the thickness of the mobile phone. The present invention provides a telephoto mobile phone lens, which comprises a prism and a lens assembly in sequence from the object side to the image side; the prism comprises an incident surface, a reflection surface and an exit surface; the lens assembly has positive focal length, and a first lens has positive focal length, and the first lens is the lens closest to the object side in the lens assembly; the entrance pupil diameter dP of the telephoto mobile phone lens and the maximum waist diameter dMax of the lens assembly satisfy: 0.825 <dP / dMax<0.863。

[0004] Optionally, the total optical length TTL and focal length f of the telephoto mobile phone lens satisfy: 0.9999≤TTL / f≤1.0002.

[0005] Optionally, the lens assembly includes a plurality of lenses, the plurality of lenses include the first lens, the second lens, the third lens and the fourth lens, the first lens, the second lens, the third lens and the fourth lens are arranged in sequence, and the Abbe number V1 of the first lens, the Abbe number V2 of the second lens, the Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: 30.2≤|V2-V1|≤33.4, 32.8≤|V4-V3|≤37.0.

[0006] Optionally, the entrance pupil diameter dP, the focal length f and the angle u' between the edge light of the central field of view and the optical axis of the telephoto mobile phone lens satisfy: 0.0003≤|dP / (f*sinu')-1|≤0.002.

[0007] Optionally, the lens assembly includes a plurality of lenses, the plurality of lenses including first two lenses arranged sequentially from the object side to the image side, namely, the first lens and the second lens, and an edge thickness dEL1 of the first lens, a center thickness dCL1 of the first lens, an edge thickness dEL2 of the second lens, and a center thickness dCL2 of the second lens satisfy: 0.16≤dEL1 / dCL1≤0.61, 1.54≤dEL2 / dCL2≤2.08.

[0008] Optionally, the focal length f1 of the first lens and the focal length f of the telephoto mobile phone lens satisfy: 0.4≤f1 / f≤0.5.

[0009] Optionally, the back focal length BFL and the field of view angle fov of the telephoto mobile phone lens satisfy: 111.5≤BFL*fov≤113.1.

[0010] Optionally, the telephoto mobile phone lens further includes a filter, and the aperture dIR and refractive index n5 of the filter satisfy: 3.684≤dIR / n5≤3.732.

[0011] Optionally, a refractive index n2 of the second lens and a refractive index n3 of the third lens satisfy: 0.964≤n2 / n3≤1.

[0012] Optionally, the lens assembly includes a plurality of lenses, the plurality of lenses including the first three lenses arranged in sequence from the object side to the image side, namely the first lens, the second lens and the third lens, the curvature radius R5 of the object side surface of the second lens, the curvature radius R6 of the image side surface of the third lens, the air gap d5 between the second lens and the third lens, and the field of view angle fov of the telephoto mobile phone lens satisfy: 180.4≤(R5-R6) / d5*fov≤232.6.

[0013] Optionally, a curvature radius R2 of the object-side surface of the first lens and a curvature radius R3 of the image-side surface of the first lens satisfy: -1.52≤(R2-R3) / (R2+R3)≤-1.35.

[0014] Optionally, the back focal length BFL of the telephoto mobile phone lens and the total optical length TTL of the telephoto mobile phone lens satisfy: 0.313≤BFL / TTL≤0.319.

[0015] Optionally, the refractive index n1 and the Abbe number V1 of the first lens satisfy: 0.0095≤(n1-1) / V1≤0.0097.

[0016] The long - focal - length mobile phone lens provided by the present invention realizes that the ratio of the entrance pupil diameter dP to the waist lens diameter D is less than 0.863 by reasonably distributing the optical powers of the lenses in the lens assembly, and the entrance pupil diameter dP and the maximum waist diameter dMax of the long - focal - length mobile phone lens satisfy: 0.825 < dP / dMax < 0.863. That is, while achieving a large aperture, the local aperture of the lens is small, which is beneficial to the miniaturization of the lens, and thus plays a role in reducing the thickness of the mobile phone. The long - focal - length mobile phone lens provided by the present invention can achieve the following beneficial effects: 1) Designed a small - size mobile phone long - focal - length lens with small aberration, large aperture and large target surface; 2) Fno < 2.4 large aperture, realizing a larger light - passing amount, and the amount of information captured by the lens also increases; 3) Large target surface, realizing a larger size of the photosensitive component, and the clarity and resolution of the lens also increase; 4) When the telephoto ratio (optical total length / focal length) is set to be less than 1.00002, the optical total length is short, which is beneficial to the miniaturization of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0018] Figure 1 Shows the optical path diagram of the long - focal - length mobile phone lens according to the embodiment of the present application.

[0019] Figure 2 is Figure 1 Schematic diagram of the size marking of the long - focal - length mobile phone lens.

[0020] Figure 3 Shows the optical structure diagram of the long - focal - length mobile phone lens according to Embodiment 1 of the present application.

[0021] Figures 4 to 9 Respectively show the MTF curve diagram, relative illuminance and Y - field - of - view diagram, field curvature diagram, distortion diagram, axial aberration diagram and lateral chromatic aberration diagram of the long - focal - length mobile phone lens of Embodiment 1.

[0022] Fig.10 Shows the optical structure diagram of the long - focal - length mobile phone lens according to Embodiment 2 of the present application.

[0023] Figures 11 to 16 Respectively show the MTF curve diagram, relative illuminance and Y - field - of - view diagram, field curvature diagram, distortion diagram, axial aberration diagram and lateral chromatic aberration diagram of the long - focal - length mobile phone lens of Embodiment 2.

[0024] Fig.17 A schematic diagram of the optical structure of a telephoto mobile phone lens according to Example 3 of the present application is shown.

[0025] Figures 18 to 23 The MTF curve diagram, relative illumination and Y field of view diagram, field curvature diagram, distortion diagram, axial aberration diagram and vertical axis chromatic aberration diagram of the telephoto mobile phone lens of Example 3 are respectively shown. DETAILED DESCRIPTION

[0026] The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Through the description of the specific implementation methods, the technical means and effects adopted by the present invention to achieve the intended purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and illustration purposes, and are not used to limit the present invention. Some well-known parts may not be shown. In each of the drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the drawings are not necessarily drawn strictly in accordance with the actual proportions.

[0027] It should be understood that the terms "first", "second", "third", "fourth", etc. are only used to distinguish components or circuits with similar properties, rather than indicating or implying relative importance or a specific order. The terms "include", "comprises", or any other variation thereof, are intended to cover non-exclusive inclusion, and may include other elements not explicitly listed in addition to those listed elements.

[0028] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical surfaces are not limited to the shapes of the spherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0029] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] The features, principles and other aspects of the present application are described in detail below.

[0032] Please also refer to Figure 1 and Figure 2 , the telephoto mobile phone lens according to the exemplary embodiment of the present application includes a prism P1 and a lens assembly in sequence from the object side to the image side; the prism P1 includes an incident surface, a reflection surface, and an exit surface; the lens assembly has a positive optical power, and the first lens has a positive optical power, and the first lens is the lens closest to the object side in the lens assembly; the entrance pupil diameter dP of the telephoto mobile phone lens and the maximum waist diameter dMax of the lens assembly satisfy: 0.825 < dP / dMax < 0.863.

[0033] Specifically, the telephoto mobile phone lens of this embodiment includes a prism P1 and a lens assembly. The light from the object sequentially passes through the prism P1 and the lens assembly and forms an image on the imaging surface IMG. The prism P1 functions to deflect the light. The incident surface and the exit surface of the prism P1 are the light incident side and the light exit side respectively, and the reflection surface of the prism P1 reflects the light entering the prism P1 to deflect the light. The lens assembly has a positive optical power to form a clear real image on the imaging surface IMG; and the first lens has a positive optical power. The first lens is the lens closest to the object side in the lens assembly, and this first lens plays a main role in converging light in the entire optical system. Its material properties can be selected as low refractive index and high Abbe number to reduce the introduction of aberration. As Figure 1 shown, the lens assembly includes a plurality of lenses, which are exemplified as including a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 in sequence. Then the waist 110 of the lens assembly is located between the first lens L1 and the fourth lens L4, that is, at the positions of the second lens L2 and the third lens L3. The waist 110 of the lens assembly can be set to make the local aperture of the lens smaller. However, the present application does not limit the lens assembly to be only Figure 1 exemplary four lenses, that is, it can also be other numbers of lenses, which are not specifically limited and are all within the protection scope of the present application. By reasonably distributing the optical powers of the lenses of the lens assembly, and the entrance pupil diameter dP of the telephoto mobile phone lens and the maximum waist diameter dMax of the lens assembly satisfy: 0.825 < dP / dMax < 0.863, it can be realized that the ratio of the entrance pupil diameter dP to the waist lens diameter D is less than 0.863, that is, while achieving a large aperture, the local aperture of the lens is smaller, which is beneficial to the miniaturization of the lens, and further plays a role in reducing the thickness of the mobile phone.

[0034] In the exemplary embodiment, as Figure 2As shown, the telephoto mobile phone lens according to the present application can satisfy 0.9999≤TTL / f≤1.0002; wherein, the total optical length of the telephoto mobile phone lens is TTL, and the focal length of the telephoto mobile phone lens is f. Satisfying 0.9999≤TTL / f≤1.0002, by controlling the total optical length TTL and focal length f of the telephoto mobile phone lens, the telephoto ratio can be controlled. The telephoto ratio is the ratio of the total optical length and focal length of the telephoto mobile phone lens. If the telephoto ratio is controlled to be small, the total optical length of the telephoto mobile phone lens is short, which is conducive to miniaturization of the lens.

[0035] In an exemplary embodiment, according to the telephoto mobile phone lens of the present application, the prism P1 is a right-angle isosceles prism. The two right-angle faces of the prism P1 are the incident face and the exit face of the prism P1, respectively. The inclined face of the prism P1 is a reflective face for deflecting light by 90° for use in an L-shaped horizontal structure; a reflective film may be provided on the reflective face.

[0036] In an exemplary embodiment, the telephoto mobile phone lens according to the present application, such as Figure 1 As shown, the lens assembly includes a plurality of lenses, and the plurality of lenses include a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are arranged in sequence, and can satisfy 30.2≤|V2-V1|≤33.4, 32.8≤|V4-V3|≤37.0; wherein the Abbe number of the first lens L1 is V1, the Abbe number of the second lens L2 is V2, the Abbe number of the third lens L3 is V3, and the Abbe number of the fourth lens L4 is V4. 30.2≤|V2-V1|≤33.4, 32.8≤|V4-V3|≤37.0 are satisfied, and by controlling the Abbe number V1 of the first lens L1, the Abbe number V2 of the second lens L2, the Abbe number V3 of the third lens L3, and the Abbe number V4 of the fourth lens L4, a combination of high and low Abbe numbers is formed, which can better correct chromatic aberration.

[0037] In an exemplary embodiment, the telephoto mobile phone lens according to the present application can satisfy 0.0003≤|dP / (f*sinu')-1|≤0.002; wherein, the entrance pupil diameter of the telephoto mobile phone lens is dP, the focal length of the telephoto mobile phone lens is f, and the angle between the marginal light of the central field of view and the optical axis is u'. Satisfying 0.0003≤|dP / (f*sinu')-1|≤0.002, by controlling the entrance pupil diameter dP of the telephoto mobile phone lens, the focal length f of the telephoto mobile phone lens, and the angle u' between the marginal light of the central field of view and the optical axis, a combination of high and low Abbe numbers is formed, which can effectively control the spherical aberration and coma of the paraxial optical system.

[0038] In an exemplary embodiment, if Figure 2As shown, according to the telephoto mobile phone lens of the present application, the lens assembly includes a plurality of lenses, and the plurality of lenses include the first two lenses arranged sequentially from the object side to the image side, namely the first lens and the second lens, which can satisfy 0.16≤dEL1 / dCL1≤0.61, 1.54≤dEL2 / dCL2≤2.08; wherein, the edge thickness of the first lens L1 is dEL1, the center thickness of the first lens L1 is dCL1, the edge thickness of the second lens L2 is dEL2, and the center thickness of the second lens L2 is dCL2. Satisfying 0.16≤dEL1 / dCL1≤0.61, 1.54≤dEL2 / dCL2≤2.08, by controlling the edge thickness dEL1 of the first lens L1, the center thickness dCL1 of the first lens L1, the edge thickness dEL2 of the second lens L2, and the center thickness dCL2 of the second lens L2, so that the center thickness dCL1 of the first lens L1 is greater than the edge thickness dEL1, and the center thickness dCL2 of the second lens L2 is less than the edge thickness dEL2, the optical path of the edge light can be increased, which is beneficial to the correction of field curvature.

[0039] In an exemplary embodiment, the telephoto mobile phone lens according to the present application can satisfy 0.4≤f1 / f≤0.5; wherein, the focal length of the first lens L1 is f1 and the focal length of the telephoto mobile phone lens is f. Satisfying 0.4≤f1 / f≤0.5, by controlling the focal length f1 of the first lens L1 and the focal length f of the telephoto mobile phone lens, it can be controlled that in the distribution of the entire optical power, the optical power allocated by the first lens L1 accounts for the largest proportion, and mainly plays the role of converging the light of the entire system, and plays a relatively small role in optimizing the aberration.

[0040] In an exemplary embodiment, if Figure 2 As shown, the telephoto mobile phone lens according to the present application can meet 111.5≤BFL*fov≤113.1; wherein, the back focal length of the telephoto mobile phone lens is BFL, and the field of view angle of the telephoto mobile phone lens is fov. Satisfying 111.5≤BFL*fov≤113.1, by controlling the back focal length BFL and the field of view angle fov of the telephoto mobile phone lens, a structural balance between the back focal length and the field of view angle can be achieved, and the short back focal length is used to meet the requirements of a large field of view and a large target surface, making the lens size more compact, which is conducive to miniaturization of the lens.

[0041] In an exemplary embodiment, according to the telephoto mobile phone lens of the present application, the lens assembly includes multiple lenses, and the multiple lenses include a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4, and the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are arranged in sequence; the first lens L1 has a positive optical focal power; the second lens L2 has a negative optical focal power, and the third lens L3 has a positive optical focal power; the fourth lens L4 has a negative optical focal power, so as to achieve the purpose of reducing the aperture of the optical system and realize the design requirements of a large aperture and a large target surface; and the focal length f1 of the first lens L1 and the focal length f2 of the second lens L2 satisfy f1 / f2<0, and the focal length f3 of the third lens L3 and the focal length f4 of the fourth lens L4 satisfy f3 / f4<0, so they are arranged in sequence in the form of a combination of positive and negative focal lengths (i.e., positive and negative optical focal powers), which is conducive to the correction of monochromatic aberrations.

[0042] In an exemplary embodiment, the telephoto mobile phone lens according to the present application further includes an IR filter, which can satisfy 3.684≤dIR / n5≤3.732; wherein, the aperture of the IR filter is dIR, and the refractive index of the IR filter is n5. Satisfying 3.684≤dIR / n5≤3.732, by controlling the aperture dIR and the refractive index n5 of the IR filter, the IR filter is set after the imaging system, which is beneficial to increase the optical path by using the IR filter, compress the back focus distance, and achieve a large aperture and miniaturization. The IR filter also meets the characteristics of low refraction and high Abbe, and has the ability to correct the aberrations generated by the imaging system.

[0043] In an exemplary embodiment, according to the telephoto mobile phone lens of the present application, the lens assembly includes a plurality of lenses, and the plurality of lenses include the first three lenses arranged in sequence from the object side to the image side, namely the first lens L1, the second lens L2 and the third lens L3, which can satisfy 0.964≤n2 / n3≤1; wherein the refractive index of the second lens L2 is n2, and the refractive index of the third lens L3 is n3. 0.964≤n2 / n3≤1 is satisfied, and by controlling the refractive index n2 of the second lens L2 and the refractive index n3 of the third lens L3, the ratio of the refractive index of the second lens L2 and the third lens L3 is controlled to be near 1, so that the light in the optical system is oversmoothed, the primary aberration introduced is small, and it is beneficial to the aberration correction of the entire optical system.

[0044] In an exemplary embodiment, according to the telephoto mobile phone lens of the present application, the lens assembly includes a plurality of lenses, and the plurality of lenses include the first three lenses arranged in sequence from the object side to the image side, namely the first lens L1, the second lens L2 and the third lens L3, which can satisfy 180.4≤(R5-R6) / d5*fov≤232.6; wherein, the radius of curvature of the object side surface of the second lens L2 is R5, the radius of curvature of the image side surface of the third lens L3 is R6, the air gap between the second lens L2 and the third lens L3 is d5, and the field of view angle of the telephoto mobile phone lens is fov. Satisfying 180.4≤(R5-R6) / d5*fov≤232.6, by controlling the curvature radius R5 of the object side surface of the second lens L2, the curvature radius R6 of the image side surface of the third lens L3, the air gap d5 between the second lens L2 and the third lens L3, and the field of view fov of the telephoto mobile phone lens, the curvature radius and the air gap of the second lens L2 and the third lens L3 can be balanced, the optical path of the entire optical system can be lengthened, the waist aperture can be reduced, and this is conducive to the miniaturization of the lens.

[0045] In an exemplary embodiment, the telephoto mobile phone lens according to the present application can satisfy -1.52≤(R2-R3) / (R2+R3)≤-1.35; wherein, the radius of curvature of the object side surface of the first lens L1 is R2, and the radius of curvature of the image side surface of the first lens L1 is R3. By satisfying -1.52≤(R2-R3) / (R2+R3)≤-1.35, by controlling the radius of curvature R2 of the object side surface of the first lens L1 and the radius of curvature R3 of the image side surface of the first lens L1, the shape of the first lens L1 can be controlled, so that the proportion of the optical power of the first lens L1 is larger, the off-axis aberration introduced is smaller, and the spherical aberration of the system can be effectively corrected.

[0046] In an exemplary embodiment, if Figure 2 As shown, the telephoto mobile phone lens according to the present application can satisfy 0.313≤BFL / TTL≤0.319; wherein, the back focal length of the telephoto mobile phone lens is BFL, and the total optical length of the telephoto mobile phone lens is TTL. Satisfying 0.313≤BFL / TTL≤0.319, by controlling the back focal length BFL of the telephoto mobile phone lens and the total optical length TTL of the telephoto mobile phone lens, the back focal length of the optical system can be made to account for a smaller proportion of the entire optical system, making the lens structure more compact, and significantly improving the miniaturization of the total optical length of the system.

[0047] In an exemplary embodiment, the telephoto mobile phone lens according to the present application may satisfy 0.0095≤(n1-1) / V1≤0.0097; wherein the refractive index of the first lens L1 is n1, and the Abbe number of the first lens L1 is V1. Satisfying 0.0095≤(n1-1) / V1≤0.0097, by controlling the refractive index n1 and the Abbe number V1 of the first lens L1, the first lens L1 adopts a low refractive index and a high Abbe number, and the chromatic aberration introduced is small, which is beneficial to the chromatic aberration correction of the entire optical system.

[0048] In an exemplary embodiment, the telephoto mobile phone lens according to the present application also includes an aperture STO, and the aperture STO can be set on the object side of the first lens.

[0049] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the telephoto mobile phone lens can be changed to obtain the various results and advantages described in this specification. For example, although four lenses are described as an example in the embodiment, the telephoto mobile phone lens is not limited to including four lenses. If necessary, the telephoto mobile phone lens may also include other numbers of lenses.

[0050] The following further describes a specific embodiment of a telephoto mobile phone lens applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0051] Example 1 The following reference Figure 3 Describe the telephoto mobile phone lens according to Example 1 of the present application. Figure 3 A schematic diagram of the optical structure of a telephoto mobile phone lens according to Example 1 of the present application is shown.

[0052] like Figure 3 As shown, the telephoto mobile phone lens includes prisms P1 ( Figure 2 Not shown, please refer to Figure 1 ) and a lens assembly. The lens assembly example includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4. The aperture STO can be arranged on the object side of the first lens L1. The filter IR can be arranged between the fourth lens L4 and the imaging surface IMG.

[0053] The first lens L1 has positive focal power, and its object side surface is convex, and its image side surface is convex. The second lens L2 has negative focal power, and its object side surface is convex, and its image side surface is concave. The third lens L3 has positive focal power, and its object side surface is concave, and its image side surface is convex. The fourth lens L4 has negative focal power, and its object side surface is convex, and its image side surface is concave. The filter IR has an object side surface and an image side surface. The light from the object passes through the prism P1, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the filter IR in sequence and reaches the imaging surface IMG.

[0054] Table 1 shows the basic parameter table of the telephoto mobile phone lens of Example 1, wherein the units of the curvature radius, thickness, aperture, focal length and edge thickness are all millimeters (mm).

[0055] Table 1:

[0056] Among them, L1-R1 represents the object-side surface of the first lens L1, L1-R2 represents the image-side surface of the first lens L1, L2-R1 represents the object-side surface of the second lens L2, L2-R2 represents the image-side surface of the second lens L2, L3-R1 represents the object-side surface of the third lens L3, L3-R2 represents the image-side surface of the third lens L3, L4-R1 represents the object-side surface of the fourth lens L4, L4-R2 represents the image-side surface of the fourth lens L4, IR-R1 represents the object-side surface of the filter IR, and IR-R2 represents the image-side surface of the filter IR.

[0057] In Embodiment 1, the object side surface and the image side surface of any lens among the first lens L1 to the fourth lens L4 are both even-order aspheric surfaces, which can be optimized and designed using Zemax design software. In Zemax, the equations of each even-order aspheric surface can be defined using, but not limited to, the following formulas: (1) Wherein, Z represents the height in the direction of the optical axis, c represents the radius of curvature, h represents the aperture in the radial direction, k represents the cone coefficient, represents the quadratic coefficient A2 of the even-order aspheric surface, represents the quartic coefficient A4 of the even-order aspheric surface, represents the sixth-order coefficient A6 of the even-order aspheric surface, represents the eighth-order coefficient A8 of the even-order aspheric surface, represents the tenth-order coefficient A10 of the even-order aspheric surface, represents the twelfth-order coefficient A12 of the even-order aspheric surface, represents the fourteenth-order coefficient A14 of the even-order aspheric surface, represents the sixteenth-order coefficient A16 of the even-order aspheric surface.

[0058] Table 2 shows the cone coefficient k and the high-order aspheric coefficients A2, A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A3 10 , A 12 , A 14 and A 16 .

[0059] Table 2:

[0060] In this embodiment, the focal length of the telephoto mobile phone lens is 10.7mm, the equivalent focal length of the telephoto mobile phone lens is 71.9mm, the working band of the telephoto mobile phone lens is 470-650nm, the imaging circle diameter of the telephoto mobile phone lens is 7mm, the field of view of the telephoto mobile phone lens is 33.3°, the total optical length of the telephoto mobile phone lens is 10.7mm, and the maximum waist diameter of the telephoto mobile phone lens is 5.7mm. The relationship between the total optical length TTL and the focal length f of the telephoto mobile phone lens is: TTL / f = 0.9999. The relationship between the Abbe number V1 of the first lens L1, the Abbe number V2 of the second lens L2, the Abbe number V3 of the third lens L3 and the Abbe number V4 of the fourth lens L4 is: |V2-V1|=33.4, |V4-V3|=36.4. The relationship between the focal length f1 of the first lens L1 and the focal length f of the telephoto mobile phone lens is: f1 / f = 0.5. The relationship between the back focal length BFL and the field of view fov of the telephoto mobile phone lens is: BFL*fov=113.1. The relationship between the focal length f1 of the first lens L1 and the focal length f2 of the second lens L2 is: f1 / f2=-0.91<0. The relationship between the focal length f3 of the third lens L3 and the focal length f4 of the fourth lens L4 is f3 / f4=-0.92<0. The relationship between the aperture dIR and the refractive index n5 of the filter IR is: dIR / n5=3.732. The relationship between the refractive index n2 of the second lens L2 and the refractive index n3 of the third lens L3 is: n2 / n3=0.982. The relationship between the radius of curvature R5 of the object side of the second lens L2, the radius of curvature R6 of the image side of the third lens L3, the air gap d5 between the second lens L2 and the third lens L3, and the field of view fov of the telephoto mobile phone lens is: (R5-R6) / d5*fov = 232.6. The relationship between the radius of curvature R2 of the object side of the first lens L1 and the radius of curvature R3 of the image side of the first lens L1 is: (R2-R3) / (R2+R3)=-1.52. The relationship between the back focal length BFL of the telephoto mobile phone lens and the total optical length TTL of the telephoto mobile phone lens is: BFL / TTL=0.317. The relationship between the entrance pupil diameter dP of the telephoto mobile phone lens and the maximum waist aperture dMax is: dP / dMax=0.825. The relationship between the entrance pupil diameter dP, focal length f and the angle u' between the edge light of the central field of view and the optical axis of the telephoto mobile phone lens is: |dP / (f*sinu')-1|=0.0020. The relationship between the refractive index n1 and the Abbe number V1 of the first lens L1 is: (n1-1) / V1=0.0095. The relationship between the edge thickness dEL1 of the first lens L1, the center thickness dCL1 of the first lens L1, the edge thickness dEL2 of the second lens L2 and the center thickness dCL2 of the second lens L2 is: dEL1 / dCL1=0.61, dEL2 / dCL2=2.08.

[0061] Figure 4The MTF curve of the telephoto mobile phone lens of Example 1 is shown. The MTF (Modulation Transfer Function) curve is the degree to which the lens reproduces the details of the subject on the imaging surface IMG as the spatial frequency changes. The MTF curve is close to the diffraction limit, and the lens imaging effect is good. Figure 5 The relative illumination and Y field of view of the telephoto mobile phone lens of Example 1 are shown. The relative illumination is greater than 75%, and the brightness of the picture is uniform. Figure 6 The field curvature diagram of the telephoto mobile phone lens of Example 1 is shown. The field curvature is less than 0.06 mm and is well corrected. Figure 7 The distortion diagram of the telephoto mobile phone lens of Example 1 is shown, and the distortion is less than 2%, which means the correction is very good. Figure 8 The axial aberration diagram of the telephoto mobile phone lens of Example 1 is shown, which illustrates the focus deviation formed on the focal plane by light of different wavelengths along the direction of the optical axis when the pupil radius is 2.2300 mm. The axial aberration is less than 0.03 mm within the aperture of 0.707, and the correction is good. Fig. 9 The vertical axis chromatic aberration diagram of the telephoto mobile phone lens of Example 1 is shown, which shows that when the maximum field of view is 17.6280Deg, the focus deviation of light of different wavelengths formed on the imaging plane along the direction perpendicular to the optical axis is within ±2μm, which is well corrected. Figures 4 to 9 It can be seen that the telephoto mobile phone lens provided in Example 1 can achieve good imaging quality.

[0062] Example 2 The following reference Fig.10 Describe the telephoto mobile phone lens according to Example 2 of the present application. Fig.10 The optical structure diagram of the telephoto mobile phone lens according to Embodiment 2 of the present application is shown. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0063] like Fig.10 As shown, the telephoto mobile phone lens includes prisms P1 ( Figure 4 Not shown, please refer to Figure 1 ) and a lens assembly. The lens assembly example includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4. The aperture STO can be arranged on the object side of the first lens L1. The filter IR can be arranged between the fourth lens L4 and the imaging surface IMG.

[0064] The first lens L1 has positive focal power, and its object side surface is convex, and its image side surface is convex. The second lens L2 has negative focal power, and its object side surface is convex, and its image side surface is concave. The third lens L3 has positive focal power, and its object side surface is concave, and its image side surface is convex. The fourth lens L4 has negative focal power, and its object side surface is convex, and its image side surface is concave. The filter IR has an object side surface and an image side surface. The light from the object passes through the prism P1, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the filter IR in sequence and reaches the imaging surface IMG.

[0065] Table 3 shows the basic parameter table of the telephoto mobile phone lens of Example 2, wherein the units of the curvature radius, thickness, aperture, focal length and edge thickness are all millimeters (mm).

[0066] Table 3:

[0067] Table 4 gives the cone coefficient k and the high-order aspheric coefficients that can be used for each even-order aspheric surface in Example 2, wherein each even-order aspheric surface can be defined by the formula (1) given in the above Example 1.

[0068] Table 4:

[0069] In this embodiment, the focal length of the telephoto mobile phone lens is 10.65mm, the equivalent focal length of the telephoto mobile phone lens is 71mm, the working band of the telephoto mobile phone lens is 470-650nm, the imaging circle diameter of the telephoto mobile phone lens is 7mm, the field of view of the telephoto mobile phone lens is 33.3°, the total optical length of the telephoto mobile phone lens is 10.7mm, and the maximum waist diameter of the telephoto mobile phone lens is 5.7mm. The relationship between the total optical length TTL and the focal length f of the telephoto mobile phone lens is: TTL / f = 1.000001. The relationship between the Abbe number V1 of the first lens L1, the Abbe number V2 of the second lens L2, the Abbe number V3 of the third lens L3 and the Abbe number V4 of the fourth lens L4 is: |V2-V1|=30.2, |V4-V3|=32.8. The relationship between the focal length f1 of the first lens L1 and the focal length f of the telephoto mobile phone lens is: f1 / f = 0.4. The relationship between the back focal length BFL and the field of view fov of the telephoto mobile phone lens is: BFL*fov=111.5. The relationship between the focal length f1 of the first lens L1 and the focal length f2 of the second lens L2 is: f1 / f2=-0.67<0. The relationship between the focal length f3 of the third lens L3 and the focal length f4 of the fourth lens L4 is f3 / f4=-3.13<0. The relationship between the aperture dIR and the refractive index n5 of the filter IR is: dIR / n5=3.725. The relationship between the refractive index n2 of the second lens L2 and the refractive index n3 of the third lens L3 is: n2 / n3=0.982. The relationship between the radius of curvature R5 of the object side of the second lens L2, the radius of curvature R6 of the image side of the third lens L3, the air gap d5 between the second lens L2 and the third lens L3, and the field of view fov of the telephoto mobile phone lens is: (R5-R6) / d5*fov =180.4. The relationship between the radius of curvature R2 of the object side of the first lens L1 and the radius of curvature R3 of the image side of the first lens L1 is: (R2-R3) / (R2+R3)=-1.36. The relationship between the back focal length BFL of the telephoto mobile phone lens and the total optical length TTL of the telephoto mobile phone lens is: BFL / TTL=0.313. The relationship between the entrance pupil diameter dP of the telephoto mobile phone lens and the maximum waist aperture dMax is: dP / dMax=0.827. The relationship between the entrance pupil diameter dP, focal length f and the angle u' between the edge light of the central field of view and the optical axis of the telephoto mobile phone lens is: |dP / (f*sinu')-1|=0.0003. The relationship between the refractive index n1 and the Abbe number V1 of the first lens L1 is: (n1-1) / V1=0.0097. The relationship between the edge thickness dEL1 of the first lens L1, the center thickness dCL1 of the first lens L1, the edge thickness dEL2 of the second lens L2 and the center thickness dCL2 of the second lens L2 is: dEL1 / dCL1=0.25, dEL2 / dCL2=1.54.

[0070] Fig.11The MTF curve of the telephoto mobile phone lens of Example 2 is shown. The MTF (Modulation Transfer Function) curve is the degree to which the lens reproduces the details of the subject on the imaging surface IMG as the spatial frequency changes. The MTF curve is close to the diffraction limit, and the lens imaging effect is good. Fig.12 The relative illumination and Y field of view of the telephoto mobile phone lens of Example 2 are shown. The relative illumination is greater than 75%, and the brightness of the picture is uniform. Fig.13 The field curvature diagram of the telephoto mobile phone lens of Example 2 is shown. The field curvature is less than 0.03 mm and is well corrected. Fig.14 The distortion diagram of the telephoto mobile phone lens of Example 2 is shown, and the distortion is less than 3%, which means the correction is very good. Fig.15 The axial aberration diagram of the telephoto mobile phone lens of Example 2 is shown, which illustrates the focus deviation formed on the focal plane by light of different wavelengths along the direction of the optical axis when the pupil radius is 2.2300 mm. The axial aberration is less than 0.03 mm within the aperture of 0.707, and the correction is good. Fig.16 The vertical axis chromatic aberration diagram of the telephoto mobile phone lens of Example 2 is shown, which shows that when the maximum field of view is 3.4000 mm, the focus deviation of light of different wavelengths formed on the imaging plane along the direction perpendicular to the optical axis is within ±2μm, which is well corrected. Figures 11 to 16 It can be seen that the telephoto mobile phone lens provided in Example 2 can achieve good imaging quality.

[0071] Example 3 The following reference Fig.17 Describe the telephoto mobile phone lens according to Example 3 of the present application. Fig.17 The optical structure diagram of the telephoto mobile phone lens according to Embodiment 3 of the present application is shown. In this embodiment, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

[0072] like Fig.17 As shown, the telephoto mobile phone lens includes prisms P1 ( Fig.17 Not shown, please refer to Figure 1 ) and a lens assembly. The lens assembly example includes a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4. The aperture STO can be arranged on the object side of the first lens L1. The filter IR can be arranged between the fourth lens L4 and the imaging surface IMG.

[0073] The first lens L1 has positive focal power, and its object side surface is convex, and its image side surface is convex. The second lens L2 has negative focal power, and its object side surface is concave, and its image side surface is concave. The third lens L3 has positive focal power, and its object side surface is concave, and its image side surface is convex. The fourth lens L4 has negative focal power, and its object side surface is convex, and its image side surface is concave. The filter IR has an object side surface and an image side surface. The light from the object passes through the prism P1, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the filter IR in sequence and reaches the imaging surface IMG.

[0074] Table 5 shows a basic parameter table of the telephoto mobile phone lens of Example 3, wherein the units of the curvature radius, thickness, aperture, focal length and edge thickness are all millimeters (mm).

[0075] Table 5:

[0076] Table 6 gives the cone coefficient k and the high-order aspheric coefficients that can be used for each even-order aspheric surface in Example 3, wherein each even-order aspheric surface can be defined by the formula (1) given in the above Example 1.

[0077] Table 6:

[0078] In this embodiment, the focal length of the telephoto mobile phone lens is 10.5mm, the equivalent focal length of the telephoto mobile phone lens is 70.5mm, the working band of the telephoto mobile phone lens is 470-650nm, the imaging circle diameter of the telephoto mobile phone lens is 6.9mm, the field of view of the telephoto mobile phone lens is 33.3°, the total optical length of the telephoto mobile phone lens is 10.5mm, and the maximum waist diameter of the telephoto mobile phone lens is 5.6mm. The relationship between the total optical length TTL and the focal length f of the telephoto mobile phone lens is: TTL / f = 1.000200. The relationship between the Abbe number V1 of the first lens L1, the Abbe number V2 of the second lens L2, the Abbe number V3 of the third lens L3 and the Abbe number V4 of the fourth lens L4 is: |V2-V1|=30.2, |V4-V3|=37.0. The relationship between the focal length f1 of the first lens L1 and the focal length f of the telephoto mobile phone lens is: f1 / f = 0.5. The relationship between the back focal length BFL of the telephoto mobile phone lens and the field of view fov is: BFL*fov=111.5. The relationship between the focal length f1 of the first lens L1 and the focal length f2 of the second lens L2 is: f1 / f2=-0.65<0. The relationship between the focal length f3 of the third lens L3 and the focal length f4 of the fourth lens L4 is f3 / f4=-3.61<0. The relationship between the aperture dIR and the refractive index n5 of the filter IR is: dIR / n5=3.684. The relationship between the refractive index n2 of the second lens L2 and the refractive index n3 of the third lens L3 is: n2 / n3=0.964. The relationship between the radius of curvature R5 of the object side of the second lens L2, the radius of curvature R6 of the image side of the third lens L3, the air gap d5 between the second lens L2 and the third lens L3, and the field of view fov of the telephoto mobile phone lens is: (R5-R6) / d5*fov =181.1. The relationship between the radius of curvature R2 of the object side of the first lens L1 and the radius of curvature R3 of the image side of the first lens L1 is: (R2-R3) / (R2+R3)=-1.35. The relationship between the back focal length BFL of the telephoto mobile phone lens and the total optical length TTL of the telephoto mobile phone lens is: BFL / TTL=0.319. The relationship between the entrance pupil diameter dP of the telephoto mobile phone lens and the maximum waist aperture dMax is: dP / dMax=0.863. The relationship between the entrance pupil diameter dP, focal length f and the angle u' between the edge light of the central field of view and the optical axis of the telephoto mobile phone lens is: |dP / (f*sinu')-1|=0.0014. The relationship between the refractive index n1 and the Abbe number V1 of the first lens L1 is: (n1-1) / V1=0.0095. The relationship between the edge thickness dEL1 of the first lens L1, the center thickness dCL1 of the first lens L1, the edge thickness dEL2 of the second lens L2 and the center thickness dCL2 of the second lens L2 is: dEL1 / dCL1=0.16, dEL2 / dCL2=1.57.

[0079] Fig.18 The MTF curve of the telephoto mobile phone lens of Example 3 is shown. The MTF (Modulation Transfer Function) curve is the degree to which the lens reproduces the details of the subject on the imaging surface IMG as the spatial frequency changes. The MTF curve is close to the diffraction limit, and the lens imaging effect is good. Fig.19 The relative illumination and Y field of view of the telephoto mobile phone lens of Example 3 are shown. The relative illumination is greater than 75%, and the brightness of the picture is uniform. Fig. 20 The field curvature diagram of the telephoto mobile phone lens of Example 3 is shown, and the field curvature is less than 0.06mm, which is well corrected. Fig.21 The distortion diagram of the telephoto mobile phone lens of Example 3 is shown, and the distortion is less than 2%, which means the correction is very good. Fig. 22 The axial aberration diagram of the telephoto mobile phone lens of Example 3 is shown, which illustrates the focus deviation formed on the focal plane by light of different wavelengths along the direction of the optical axis when the pupil radius is 2.3250 mm. The axial aberration is less than 0.02 mm within the aperture of 0.707, and the correction is good. Fig.23 The vertical axis chromatic aberration diagram of the telephoto mobile phone lens of Example 3 is shown, which shows that when the maximum field of view is 3.4000 mm, the focus deviation of light of different wavelengths formed on the imaging plane along the direction perpendicular to the optical axis is within ±2μm, which is well corrected. Figures 18 to 23 It can be seen that the telephoto mobile phone lens provided in Example 3 can achieve good imaging quality.

[0080] In summary, Example 1, Example 2 and Example 3 respectively satisfy the relationship shown in Table 7.

[0081] Table 7:

[0082] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A telephoto mobile phone lens, characterized in that: The components include a prism and a lens from the object side to the image side; The prism comprises an incident surface, a reflecting surface and an exiting surface; The lens assembly has positive focal power, and the first lens has positive focal power, and the first lens is the lens closest to the object side in the lens assembly; the entrance pupil diameter dP of the telephoto mobile phone lens and the maximum waist diameter dMax of the lens assembly meet: 0.825 <dP / dMax<0.863。 2. The telephoto mobile phone lens according to claim 1, characterized in that: The total optical length TTL and focal length f of the telephoto mobile phone lens satisfy: 0.9999≤TTL / f≤1.0002.

3. The telephoto mobile phone lens according to claim 1, characterized in that: The entrance pupil diameter dP, focal length f and angle u' between the edge light of the central field of view and the optical axis of the telephoto mobile phone lens satisfy: 0.0003≤|dP / (f*sinu')-1|≤0.

002.

4. The telephoto mobile phone lens according to claim 1, characterized in that: The lens assembly includes a plurality of lenses, the plurality of lenses including first two lenses arranged sequentially from the object side to the image side, namely, the first lens and the second lens, the edge thickness dEL1 of the first lens, the center thickness dCL1 of the first lens, the edge thickness dEL2 of the second lens, and the center thickness dCL2 of the second lens satisfy: 0.16≤dEL1 / dCL1≤0.61, 1.54≤dEL2 / dCL2≤2.

08.

5. The telephoto mobile phone lens according to claim 1, characterized in that: The focal length f1 of the first lens and the focal length f of the telephoto mobile phone lens satisfy: 0.4≤f1 / f≤0.

5.

6. The telephoto mobile phone lens according to claim 1, characterized in that: The back focal length BFL and field of view angle fov of the telephoto mobile phone lens satisfy: 111.5≤BFL*fov≤113.

1.

7. The telephoto mobile phone lens according to claim 1, characterized in that: The telephoto mobile phone lens also includes a filter, and the aperture dIR and refractive index n5 of the filter satisfy: 3.684≤dIR / n5≤3.

732.

8. The telephoto mobile phone lens according to claim 1, characterized in that: The lens assembly includes a plurality of lenses, and the plurality of lenses include the first three lenses arranged in sequence from the object side to the image side, namely, the first lens, the second lens and the third lens. The curvature radius R5 of the object side surface of the second lens, the curvature radius R6 of the image side surface of the third lens, the air gap d5 between the second lens and the third lens, and the field of view fov of the telephoto mobile phone lens satisfy: 180.4≤(R5-R6) / d5*fov≤232.

6.

9. The telephoto mobile phone lens according to claim 1, characterized in that: A curvature radius R2 of the object-side surface of the first lens and a curvature radius R3 of the image-side surface of the first lens satisfy: -1.52≤(R2-R3) / (R2+R3)≤-1.

35.

10. The telephoto mobile phone lens according to claim 1, characterized in that: The back focal length BFL of the telephoto mobile phone lens and the total optical length TTL of the telephoto mobile phone lens satisfy: 0.313≤BFL / TTL≤0.319.

Images