Large target surface mobile phone long-focus lens

Abstract

The application discloses a large-target mobile phone long-focus lens, which comprises a first lens, a second lens, a prism, a third lens, a fourth lens and a fifth lens in sequence from the object side to the image side along the optical axis; the first lens to the fifth lens each comprises an object side surface facing the object side and allowing imaging light to pass through and an image side surface facing the image side and allowing imaging light to pass through; the focal length f1 of the first lens and the combined focal length f2345 of the second lens to the fifth lens satisfy 0.3 < f1 / f2345 < 0.5. The large-target mobile phone long-focus lens can realize good imaging quality in different shooting distances.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a large-area telephoto lens for mobile phones. Background Technology

[0002] Telephoto lenses for mobile phones often present a trade-off between focal length, lens size, and lens aperture. For example, when the lens size is large and the focal length is long, the lens aperture also becomes large, leading to an increase in the thickness of the lens module and affecting the overall thickness of the phone. Furthermore, because large-lens telephoto lenses for mobile phones have long focal lengths, achieving macro photography is difficult, and the image quality in macro mode is significantly worse than at infinity, limiting their practicality. Summary of the Invention

[0003] In view of the above problems, the purpose of this invention is to provide a large-area telephoto lens for mobile phones that can achieve good imaging quality at different shooting distances.

[0004] This invention provides a large-aperture telephoto lens for mobile phones. The large-aperture telephoto lens, along its optical axis from the object side to the image side, sequentially comprises a first lens, a second lens, a prism, a third lens, a fourth lens, and a fifth lens. Each of the first to fifth lenses includes an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through. The focal length f1 of the first lens and the combined focal length f2345 of the second to fifth lenses satisfy: 0.3 <f1 / f2345<0.5。

[0005] Optionally, the fourth lens is a meniscus lens, with the object side being concave and the image side being convex.

[0006] Optionally, both the object-side and image-side surfaces of the fifth lens are w-shaped relative to the imaging plane.

[0007] Optionally, the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens, and the focal length f4 of the fourth lens satisfy: |f1|<10mm<|f2|<|f3|<|f4|.

[0008] Optionally, the thickness H2 of the second lens, the thickness H3 of the third lens, the thickness H4 of the fourth lens, and the thickness H5 of the fifth lens satisfy: 0.01mm≤|(H3+H4)-(H2+H5)|≤0.2mm.

[0009] Optionally, the dispersion coefficient V1 of the first lens and the dispersion coefficient V5 of the fifth lens satisfy: |V1-V5|<10.

[0010] Optionally, the sagitta P3S1 of the object side of the third lens and the sagitta P3S2 of the image side of the third lens satisfy: P3S1+P3S2<0.15mm.

[0011] Optionally, the aperture P1D1 of the object-side surface of the first lens satisfies: 4.5mm. <P1D1<5mm。

[0012] Optionally, the total length (TTL) of the large-area mobile phone telephoto lens and the focal length (f′) of the large-area mobile phone telephoto lens satisfy: TTL / f′<1.

[0013] Optionally, the aperture F of the large-aperture mobile phone telephoto lens, the focal length f′ of the large-aperture mobile phone telephoto lens, and the effective aperture P5D2 of the fifth lens satisfy: |f′ / F-P5D2|<0.4.

[0014] Optionally, the dispersion coefficients V1 and V2 of the first lens satisfy: |V1-V2|>30.

[0015] Optionally, the radius of curvature P1R1 of the object side of the first lens and the radius of curvature P5R2 of the image side of the fifth lens satisfy: |P1R1-P5R2|<1.5mm.

[0016] Optionally, the refractive index n1 and the dispersion coefficient V1 of the first lens satisfy: n1 < 1.6 and V1 > 50.

[0017] Optionally, the total length TTL of the large-area mobile phone telephoto lens and the imaging circle diameter 2H of the large-area mobile phone telephoto lens satisfy: TTL / 2H<2.

[0018] Optionally, the total length TTL of the large-area mobile phone telephoto lens, and the thickness H15 between the first lens and the fifth lens, satisfy: H15 / TTL<0.6.

[0019] The large-aperture telephoto lens for mobile phones provided by this invention, through reasonable allocation of optical power, can achieve focusing and imaging within a range from 30cm to infinity using a 1 / 2″ large-aperture lens, achieving essentially consistent image quality at both 30cm and infinity. Reasonable optical power allocation also effectively reduces noise interference, improves the signal-to-noise ratio, and enhances image quality in complex lighting environments. Furthermore, reasonable optical power allocation improves the manufacturability of the lens. Through reasonable material selection and optical power allocation, good image quality is achieved at different shooting distances. The large-aperture telephoto lens for mobile phones provided by this invention can achieve the following beneficial effects:

[0020] 1) A mobile phone telephoto lens with 3.5x zoom, f / 3.5 aperture, and 1 / 2″ aperture was designed;

[0021] 2) Achieve clear imaging at macro distances from 30cm to infinity;

[0022] 3) The high processability of the lenses helps to improve the yield of processing and assembly, and reduce costs;

[0023] 4) The small lens diameter is beneficial for reducing the thickness of the mobile phone. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 An optical path diagram of a large-area mobile phone telephoto lens according to an embodiment of this application is shown.

[0026] Figure 2 A schematic diagram of the optical structure of a large-area mobile phone telephoto lens according to Embodiment 1 of this application is shown;

[0027] Figures 3 to 8 The MTF curves of the large-area mobile phone telephoto lens of Example 1 at infinity, at 30cm, relative illumination and Y field of view, distortion, axial aberration and transverse chromatic aberration are shown respectively.

[0028] Figure 9 A schematic diagram of the optical structure of a large-area mobile phone telephoto lens according to Embodiment 2 of this application is shown;

[0029] Figures 10 to 15 The MTF curves of the large-area mobile phone telephoto lens of Example 2 at infinity object distance, MTF curves at 30cm object distance, relative illumination and Y field of view, distortion diagram, axial aberration diagram and transverse chromatic aberration diagram are shown respectively.

[0030] Figure 16 A schematic diagram of the optical structure of a large-area mobile phone telephoto lens according to Embodiment 3 of this application is shown;

[0031] Figures 17 to 22 The MTF curves of the large-area mobile phone telephoto lens of Example 3 at infinity, at 30cm, relative illumination and Y field of view, distortion, axial aberration and transverse chromatic aberration are shown respectively. Detailed Implementation

[0032] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the present invention; some well-known parts may not be shown. In the various drawings, the same elements are represented by similar reference numerals. For clarity, the various parts in the drawings are not necessarily drawn strictly to scale.

[0033] It is important to understand that the terms "first," "second," "third," "fourth," etc., are used merely to distinguish elements or circuits with similar properties, and do not indicate or imply relative importance or a specific order. The terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the listed elements but also other elements not expressly listed.

[0034] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shape of the sphere shown in the drawings is illustrated by way of example. That is, the shape of the sphere is not limited to that shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0035] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] The features, principles and other aspects of this application are described in detail below.

[0038] like Figure 1As shown, the long - focal - length lens for large - target - area mobile phones according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis, a first lens P1, a second lens P2, a prism L1, a third lens P3, a fourth lens P4, and a fifth lens P5; the first lens P1 to the fifth lens P5 each include an object side facing the object side and allowing imaging light to pass through and an image side facing the image side and allowing imaging light to pass through; the focal length f1 of the first lens P1 and the combined focal length f2345 of the second lens P2 to the fifth lens P5 satisfy: 0.3 < f1 / f2345 < 0.5. The long - focal - length lens for large - target - area mobile phones in this embodiment includes five lenses. By reasonably distributing the optical power and spacing of each lens, the long - focal - length function is achieved, and by controlling the focal length f1 of the first lens P1 and the combined focal length f2345 of the second lens P2 to the fifth lens P5 to satisfy: 0.3 < f1 / f2345 < 0.5, the optical system can achieve macro - focus at 30 cm, and good imaging quality within different shooting distances is achieved.

[0039] In an exemplary embodiment, for the long - focal - length lens for large - target - area mobile phones according to the present application, the fourth lens P4 is a meniscus lens, the object side of the fourth lens P4 is concave, and the image side is convex. By controlling the shape of the fourth lens P4, the vertices of the two curved surfaces of the object side and the image side of the fourth lens P4 both face away from the imaging surface IMG, which is beneficial to improving the relative illumination and avoiding vignetting.

[0040] In an exemplary embodiment, for the long - focal - length lens for large - target - area mobile phones according to the present application, both the object side and the image side of the fifth lens P5 present a w - shape relative to the imaging surface IMG. By controlling the shape of the fifth lens P5, it is beneficial to correct distortion.

[0041] In an exemplary embodiment, the long - focal - length lens for large - target - area mobile phones according to the present application can satisfy |f1| < 10 mm < |f2| < |f3| < |f4|; where, the focal length of the first lens P1 is f1, the focal length of the second lens P2 is f2, the focal length of the third lens P3 is f3, and the focal length of the fourth lens P4 is f4. Satisfying |f1| < 10 mm < |f2| < |f3| < |f4|, by controlling the focal length f1 of the first lens P1, the focal length f2 of the second lens P2, the focal length f3 of the third lens P3, and the focal length f4 of the fourth lens P4, the optical power of the lenses is gradually reduced in turn, which can reduce the sensitivity of the optical system, be beneficial to improving the processing accuracy of the lenses; reduce the temperature drift of the optical system, and adapt to a wider temperature change range; be beneficial to the assembly of the lens and improve the assembly yield of the lens.

[0042] In an exemplary embodiment, the large-target mobile phone telephoto lens according to the present application can satisfy 0.01 mm ≤ |(H3 + H4) - (H2 + H5)| ≤ 0.2 mm; where the thickness of the second lens P2 is H2, the thickness of the third lens P3 is H3, the thickness of the fourth lens P4 is H4, and the thickness of the fifth lens P5 is H5. Satisfying 0.01 mm ≤ |(H3 + H4) - (H2 + H5)| ≤ 0.2 mm, by controlling the thickness H2 of the second lens P2, the thickness H3 of the third lens P3, the thickness H4 of the fourth lens P4, and the thickness H5 of the fifth lens P5, and reasonably distributing the thickness ranges of each lens, it is beneficial to reduce the lens assembly difficulty.

[0043] In an exemplary embodiment, the large-target mobile phone telephoto lens according to the present application can satisfy |V1 - V5| < 10; where the dispersion coefficient of the first lens P1 is V1, and the dispersion coefficient of the fifth lens P5 is V5. Satisfying |V1 - V5| < 10, by controlling the dispersion coefficient V1 of the first lens P1 and the dispersion coefficient V5 of the fifth lens P5, the dispersion coefficients between the first lens P1 and the fifth lens P5 are made close, which is beneficial to reducing the chromatic aberration of the optical system, improving the imaging quality of the optical system, and achieving a high-definition effect.

[0044] In an exemplary embodiment, the large-target mobile phone telephoto lens according to the present application can satisfy P3S1 + P3S2 < 0.15 mm; where the sagittal height of the object side of the third lens P3 is P3S1, and the sagittal height of the image side of the third lens P3 is P3S2. Satisfying P3S1 + P3S2 < 0.15 mm, by controlling the sagittal height P3S1 of the object side of the third lens P3 and the sagittal height P3S2 of the image side of the third lens P3, the surface reverse curvature of the lens can be reduced, the incident and exit angles of light can be reduced, the system sensitivity can be lowered, and at the same time, the stray light's random reflection can be reduced, and the signal-to-noise ratio of the optical system can be improved.

[0045] In an exemplary embodiment, the large-target mobile phone telephoto lens according to the present application can satisfy 4.5 mm < P1D1 < 5 mm; where the aperture of the object side of the first lens P1 is P1D1. Satisfying 4.5 mm < P1D1 < 5 mm, by controlling the aperture P1D1 of the object side of the first lens P1, it can be used to satisfy the 3.5 aperture effect, and at the same time compress the lens aperture to avoid the lens being too thick.

[0046] In an exemplary embodiment, the large-target mobile phone telephoto lens according to the present application can satisfy TTL / f′ < 1; where the total length of the large-target mobile phone telephoto lens is TTL, and the focal length of the large-target mobile phone telephoto lens is f′. Satisfying TTL / f′ < 1, by controlling the total length TTL of the large-target mobile phone telephoto lens and the focal length f′ of the large-target mobile phone telephoto lens, while satisfying the focal length, the total length of the optical lens can be compressed to achieve miniaturization of the telephoto lens.

[0047] In an exemplary embodiment, the large-aperture telephoto lens for mobile phones according to this application satisfies |f′ / F-P5D2|<0.4; wherein the aperture of the large-aperture telephoto lens is F, the focal length of the large-aperture telephoto lens is f′, and the effective aperture of the fifth lens P5 is P5D2. By satisfying |f′ / F-P5D2|<0.4, and by controlling the aperture F, the focal length f′, and the effective aperture P5D2 of the large-aperture telephoto lens, the effective aperture of the fifth lens P5 can be controlled simultaneously, avoiding an excessively thick lens.

[0048] In an exemplary embodiment, the large-area telephoto lens for mobile phones according to this application satisfies |V1-V2|>30; wherein the dispersion coefficient of the first lens P1 is V1 and the dispersion coefficient of the second lens P2 is V2. Satisfying |V1-V2|>30, the chromatic aberration of the optical system can be reduced by controlling the high and low dispersion combination of the first lens P1 and the second lens P2.

[0049] In an exemplary embodiment, the large-area telephoto lens for mobile phones according to this application satisfies |P1R1-P5R2|<1.5mm; wherein, the radius of curvature of the object-side surface of the first lens P1 is P1R1, and the radius of curvature of the image-side surface of the fifth lens P5 is P5R2. Satisfying |P1R1-P5R2|<1.5mm, by controlling the radius of curvature P1R1 of the object-side surface of the first lens P1 and the radius of curvature P5R2 of the image-side surface of the fifth lens P5, the 0-field-of-view optical path can be controlled, which is beneficial to improving the imaging effect of the 0-field-of-view.

[0050] In an exemplary embodiment, the large-area telephoto lens for mobile phones according to this application satisfies n1 < 1.6 and V1 > 50; wherein, the refractive index of the first lens P1 is n1, and the dispersion coefficient of the first lens P1 is V1. Satisfying n1 < 1.6 and V1 > 50, by controlling the refractive index n1 and the dispersion coefficient V1 of the first lens P1, the first lens P1 has a low refractive index and a high dispersion coefficient, which is beneficial to reduce the dispersion entering the optical system, reduce the difficulty of correcting aberrations in other lenses, make the lens shape more reasonable, reduce the sensitivity of the system, and also reduce the processing and assembly difficulty of the lens.

[0051] In an exemplary embodiment, the large-area telephoto lens for mobile phones according to this application satisfies TTL / 2H<2; wherein, the total length of the large-area telephoto lens is TTL, and the imaging circle diameter of the large-area telephoto lens is 2H. By satisfying TTL / 2H<2 and controlling the total length TTL and the imaging circle diameter 2H of the large-area telephoto lens, a balance can be achieved between the volume of the optical system and the imaging target surface, avoiding an excessively large optical system volume that would hinder miniaturization.

[0052] In an exemplary embodiment, the large-aperture telephoto lens for mobile phones according to this application can satisfy H15 / TTL<0.6; wherein, the total length of the large-aperture telephoto lens for mobile phones is TTL, and the thickness between the first lens P1 and the fifth lens P5 is H15. By satisfying H15 / TTL<0.6 and controlling the total length TTL of the large-aperture telephoto lens for mobile phones and the thickness H15 between the first lens P1 and the fifth lens P5, the thickness of the lens body can be controlled, avoiding the lens becoming too long and increasing weight, which would cause the focusing motor to increase in size to push the lens, ultimately resulting in a significantly larger camera module.

[0053] In an exemplary embodiment, the large-aperture telephoto lens for mobile phones according to this application further includes an aperture stop STO, which is disposed on the object-side surface of the first lens P1 to further improve overall performance. In other exemplary embodiments, the aperture stop STO may be disposed between other lenses.

[0054] In an exemplary embodiment, the large-aperture telephoto lens for mobile phones according to this application further includes an IR filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface IMG.

[0055] In an exemplary embodiment, the large-aperture telephoto lens of the mobile phone according to this application further includes a prism L1 for folding light, thereby reducing the height of the optical system. In one embodiment, the prism L1 is a right-angled isosceles prism. The two right-angled faces of the prism L1 serve as the light-incident side and the light-exit side of the prism L1, respectively. The angle between the right-angled face of the light-incident side and the zero-field-of-view principal ray is 90°. The inclined surface of the prism L1 can be provided with a reflective film to deflect the light by 90°, so that the angle between the right-angled face of the light-exit side and the zero-field-of-view principal ray is 90°.

[0056] However, those skilled in the art will understand that the number of lenses constituting the optical imaging lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although five lenses are described as an example in the embodiments, the optical imaging lens is not limited to including five lenses. If desired, the optical imaging lens may also include other numbers of lenses.

[0057] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of a large-area mobile phone telephoto lens applicable to the above-described embodiments.

[0058] Example 1

[0059] The following is for reference Figure 2 Description of a large-area mobile phone telephoto lens according to Embodiment 1 of this application. Figure 2 A schematic diagram of the optical structure of a large-area mobile phone telephoto lens according to Embodiment 1 of this application is shown.

[0060] like Figure 2 As shown, the large-aperture telephoto lens for mobile phones includes, from the object side to the image side, an aperture stop STO, a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a fifth lens P5, an IR filter, and an imaging surface IMG. Each of the first lens P1 to the fifth lens P5 includes an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through.

[0061] The first lens P1 has positive optical power, with its object-side surface 11 being convex and its image-side surface 12 being concave. The second lens P2 has negative optical power, with its object-side surface 21 being convex and its image-side surface 22 being concave. The third lens P3 has negative optical power, with its object-side surface 31 being concave and its image-side surface 32 being concave. The fourth lens P4 has positive optical power, with its object-side surface 41 being concave and its image-side surface 42 being convex. The fifth lens P5 has negative optical power, with its object-side surface 51 being convex and its image-side surface 52 being concave. The filter IR has an object-side surface 61 and an image-side surface 62. Light from the object passes sequentially through the aperture STO, the first lens P1, the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5, and the filter IR, and is finally imaged on the imaging plane IMG.

[0062] Table 1 shows the basic parameters of the large-area mobile phone telephoto lens of Example 1, where the units for radius of curvature, thickness, focal length, half-aperture, and elevation are all millimeters (mm).

[0063] Table 1:

[0064]

[0065] In Example 1, the object-side surface and image-side surface of any one of the first lens P1 to the fifth lens P5 are both even-order aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0066]

[0067] Where z is the distance vector from the vertex of the aspherical surface at a height of r along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; A2, A4, A6, A8, A 10 A 12 A 14 and A 16 These are the correction coefficients for the second, fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders of aspherical surfaces, respectively.

[0068] Table 2 provides the conic coefficient k and higher-order aspherical coefficients A2, A4, A6, A8, and A6 that can be used for each aspherical mirror in Example 1. 10 A 12 A 14 and A 16 .

[0069] Table 2:

[0070]

[0071]

[0072] In this embodiment, the focal length of the large-aperture mobile phone telephoto lens is 16.8mm, the equivalent focal length is 86.5mm, the operating wavelength is 410-650nm, the aperture is f / 3.49, the imaging circle diameter is 8.48mm, the field of view is 28°, the total optical length is 15.7mm, and the maximum lens diameter is 5.16mm. The relationship between the focal length f1 of the first lens P1 and the combined focal length f2345 of the second lens P2 to the fifth lens P5 is: f1 / f2345 = 0.444. The focal lengths f1 of the first lens P1, f2 of the second lens P2, f3 of the third lens P3, and f4 of the fourth lens P4 are related as follows: |f1| = 7.50 mm, |f2| = 15.70 mm, |f3| = 24.80 mm, and |f4| = 192.90 mm. The thicknesses H2 of the second lens P2, H3 of the third lens P3, H4 of the fourth lens P4, and H5 of the fifth lens P5 are related as follows: |(H3+H4)-(H2+H5)| = |1.845-1.897| = 0.052. The dispersion coefficients V1 of the first lens P1 and V5 of the fifth lens P5 are related as follows: |V1-V5| = 0.000. The relationship between the sagitta of the object-side surface 31 of the third lens P3 (P3S1) and the sagitta of the image-side surface 32 of the third lens P3 (P3S2) is: P3S1 + P3S2 = 0.072 mm. The relationship between the aperture P1D1 of the object-side surface 11 of the first lens P1 is: P1D1 = 4.821 mm. The relationship between the total length (TTL) and focal length (f′) of the large-aperture mobile phone telephoto lens is: TTL / f′ = 0.935. The relationship between the aperture (F) and focal length (f′) of the large-aperture mobile phone telephoto lens, and the effective aperture P5D2 of the fifth lens P5 is: |f′ / F - P5D2| = 0.361. The relationship between the dispersion coefficient V1 of the first lens P1 and the dispersion coefficient V2 of the second lens P2 is: |V1 - V2| = 37.50. The relationship between the radius of curvature P1R1 of the object side surface 11 of the first lens P1 and the radius of curvature P5R2 of the image side surface 12 of the fifth lens P5 is: |P1R1-P5R2|=1.114. The relationship between the refractive index n1 and the dispersion coefficient V1 of the first lens P1 is: n1=1.50 and V1=57.90. The relationship between the total length TTL of the large-aperture mobile phone telephoto lens and the imaging circle diameter 2H of the large-aperture mobile phone telephoto lens is: TTL / 2H=1.85. The relationship between the total length TTL of the large-aperture mobile phone telephoto lens and the thickness H15 between the first lens P1 and the fifth lens P5 is: H15 / TTL=0.53.

[0073] Figure 3The diagram shows the MTF curve of the large-area mobile phone telephoto lens of Example 1 at infinity. The MTF (Modulation Transfer Function) curve represents the degree of reproduction of the details of the subject onto the image plane by the lens as a function of spatial frequency. At infinity, the MTF curve is close to the diffraction limit, indicating that the lens has very good image quality. Figure 4 The MTF curve of the large-area mobile phone telephoto lens of Example 1 at an object distance of 30cm is shown. The MTF curve at an object distance of 30cm is close to the diffraction limit, and the lens imaging quality is very good. Figure 5 The relative illumination and Y-field diagram of the large-area mobile phone telephoto lens of Example 1 are shown. The relative illumination is greater than 85%, and the screen brightness is uniform. Figure 6 The distortion diagram of the large-area mobile phone telephoto lens of Example 1 is shown. The distortion is less than 1%, and the correction is very good. Figure 7 The diagram shows the axial aberration of the large-area mobile phone telephoto lens of Example 1. When the example pupil radius is 2.4100mm, the focal point of different wavelengths of light along the optical axis deviates on the focal plane. The axial deviation is less than 0.04mm, which is a good correction. Figure 8 The diagram shows the lateral chromatic aberration of the large-area mobile phone telephoto lens of Example 1. In the example, at a maximum field of view of 4.200 mm, along a direction perpendicular to the optical axis, the focal deviation of different wavelengths of light formed on the imaging plane is within 8 μm, indicating good color reproduction. According to... Figures 3 to 8 As can be seen, the large-area telephoto lens for mobile phones given in Example 1 achieves good imaging quality at different shooting distances.

[0074] Example 2

[0075] The following is for reference Figure 9 Description of a large-area mobile phone telephoto lens according to Embodiment 2 of this application. Figure 9 A schematic diagram of the optical structure of a large-area mobile phone telephoto lens according to Embodiment 2 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0076] like Figure 9 As shown, the large-aperture telephoto lens for mobile phones includes, from the object side to the image side, an aperture stop STO, a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a fifth lens P5, an IR filter, and an imaging surface IMG. Each of the first lens P1 to the fifth lens P5 includes an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through.

[0077] The first lens P1 has positive optical power, with its object-side surface 11 being convex and its image-side surface 12 being concave. The second lens P2 has negative optical power, with its object-side surface 21 being convex and its image-side surface 22 being concave. The third lens P3 has negative optical power, with its object-side surface 31 being concave and its image-side surface 32 being concave. The fourth lens P4 has positive optical power, with its object-side surface 41 being concave and its image-side surface 42 being convex. The fifth lens P5 has negative optical power, with its object-side surface 51 being convex and its image-side surface 52 being concave. The filter IR has an object-side surface 61 and an image-side surface 62. Light from the object passes sequentially through the aperture STO, the first lens P1, the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5, and the filter IR, and is finally imaged on the imaging plane IMG.

[0078] Table 3 shows the basic parameters of the large-area mobile phone telephoto lens of Example 2, where the units for radius of curvature, thickness, focal length, half-aperture and height are all millimeters (mm).

[0079] Table 3:

[0080]

[0081] Table 4 gives the conic coefficient k and higher-order aspheric coefficients that can be used for each aspheric mirror in Example 2. The aspheric surface shape can be defined by formula (1) given in Example 1 above.

[0082] Table 4:

[0083]

[0084] In this embodiment, the focal length of the large-aperture mobile phone telephoto lens is 16.9mm, the equivalent focal length is 86.5mm, the operating wavelength is 410-650nm, the aperture is f / 3.50, the imaging circle diameter is 8.48mm, the field of view is 28°, the total optical length is 15.4mm, and the maximum lens diameter is 5.16mm. The relationship between the focal length f1 of the first lens P1 and the combined focal length f2345 of the second lens P2 to the fifth lens P5 is: f1 / f2345 = 0.392. The focal lengths f1 of the first lens P1, f2 of the second lens P2, f3 of the third lens P3, and f4 of the fourth lens P4 are related as follows: |f1| = 6.63 mm, |f2| = 13.30 mm, |f3| = 23.70 mm, and |f4| = 51.70 mm. The thicknesses H2 of the second lens P2, H3 of the third lens P3, H4 of the fourth lens P4, and H5 of the fifth lens P5 are related as follows: |(H3+H4)-(H2+H5)| = |1.845-1.897| = 0.052. The dispersion coefficients V1 of the first lens P1 and V5 of the fifth lens P5 are related as follows: |V1-V5| = 1.200. The relationship between the sagitta of the object-side surface 31 of the third lens P3 (P3S1) and the sagitta of the image-side surface 32 of the third lens P3 (P3S2) is: P3S1 + P3S2 = 0.006 mm. The relationship between the aperture P1D1 of the object-side surface 11 of the first lens P1 is: P1D1 = 4.821 mm. The relationship between the total length (TTL) and focal length (f′) of the large-aperture mobile phone telephoto lens is: TTL / f′ = 0.911. The relationship between the aperture (F) and focal length (f′) of the large-aperture mobile phone telephoto lens, and the effective aperture P5D2 of the fifth lens P5 is: |f′ / F - P5D2| = 0.332. The relationship between the dispersion coefficient V1 of the first lens P1 and the dispersion coefficient V2 of the second lens P2 is: |V1 - V2| = 33.80. The relationship between the radius of curvature P1R1 of the object side surface 11 of the first lens P1 and the radius of curvature P5R2 of the image side surface 52 of the fifth lens P5 is: |P1R1-P5R2|=1.114. The relationship between the refractive index n1 and the dispersion coefficient V1 of the first lens P1 is: n1=1.50 and V1=57.20. The relationship between the total length TTL of the large-aperture mobile phone telephoto lens and the imaging circle diameter 2H of the large-aperture mobile phone telephoto lens is: TTL / 2H=1.82. The relationship between the total length TTL of the large-aperture mobile phone telephoto lens and the thickness H15 between the first lens P1 and the fifth lens P5 is: H15 / TTL=0.54.

[0085] Figure 10The diagram shows the MTF curve of the large-area mobile phone telephoto lens in Example 2 at infinity. The MTF (Modulation Transfer Function) curve represents the degree of detail reproduction of the subject onto the image plane by the lens as a function of spatial frequency. At infinity, the MTF curve is close to the diffraction limit, indicating that the lens has excellent image quality. Figure 11 The MTF curve of the large-area mobile phone telephoto lens of Example 2 at an object distance of 30cm is shown. The MTF curve at an object distance of 30cm is close to the diffraction limit, and the lens imaging quality is very good. Figure 12 The relative illumination and Y-field diagram of the large-area mobile phone telephoto lens of Example 2 are shown. The relative illumination is greater than 85%, and the screen brightness is uniform. Figure 13 The distortion diagram of the large-area mobile phone telephoto lens of Example 2 is shown. The distortion is less than 1%, and the correction is very good. Figure 14 The diagram shows the axial aberration of the large-area mobile phone telephoto lens of Example 2. When the example pupil radius is 2.4100mm, the focal point of different wavelengths of light along the optical axis deviates on the focal plane. The axial deviation is less than 0.02mm, which is a good correction. Figure 15 The diagram shows the lateral chromatic aberration of the large-area mobile phone telephoto lens of Example 2. In the example, at a maximum field of view of 4.200 mm, the focal deviation of different wavelengths of light formed on the imaging plane along a direction perpendicular to the optical axis is within 5 μm, indicating good color reproduction. According to... Figures 10 to 15 It can be seen that the large-area telephoto lens for mobile phones given in Example 2 achieves good imaging quality at different shooting distances.

[0086] Example 3

[0087] The following is for reference Figure 16 Description of a large-area mobile phone telephoto lens according to Embodiment 3 of this application. Figure 16 A schematic diagram of the optical structure of a large-area mobile phone telephoto lens according to Embodiment 3 of this application is shown. In this embodiment, for the sake of brevity, descriptions similar to those in Embodiment 1 are omitted.

[0088] like Figure 16 As shown, the large-aperture telephoto lens for mobile phones includes, from the object side to the image side, an aperture stop STO, a first lens P1, a second lens P2, a third lens P3, a fourth lens P4, a fifth lens P5, an IR filter, and an imaging surface IMG. Each of the first lens P1 to the fifth lens P5 includes an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through.

[0089] The first lens P1 has positive optical power, with its object-side surface 11 being convex and its image-side surface 12 being concave. The second lens P2 has negative optical power, with its object-side surface 21 being convex and its image-side surface 22 being concave. The third lens P3 has negative optical power, with its object-side surface 31 being concave and its image-side surface 32 being concave. The fourth lens P4 has positive optical power, with its object-side surface 41 being concave and its image-side surface 42 being convex. The fifth lens P5 has negative optical power, with its object-side surface 51 being convex and its image-side surface 52 being concave. The filter IR has an object-side surface 61 and an image-side surface 62. Light from the object passes sequentially through the aperture STO, the first lens P1, the second lens P2, the third lens P3, the fourth lens P4, the fifth lens P5, and the filter IR, and is finally imaged on the imaging plane IMG.

[0090] Table 5 shows the basic parameters of the large-area mobile phone telephoto lens of Example 3, where the units for radius of curvature, thickness, focal length, half-aperture, and elevation are all millimeters (mm).

[0091] Table 5:

[0092]

[0093]

[0094] Table 6 gives the higher-order coefficients that can be used for each aspherical mirror in Example 3, wherein each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0095] Table 6:

[0096]

[0097] In this embodiment, the focal length of the large-aperture mobile phone telephoto lens is 16.9mm, the equivalent focal length is 86.5mm, the operating wavelength is 410-650nm, the aperture is f / 3.50, the imaging circle diameter is 8.48mm, the field of view is 28°, the total optical length is 16mm, and the maximum lens diameter is 5.18mm. The relationship between the focal length f1 of the first lens P1 and the combined focal length f2345 of the second lens P2 to the fifth lens P5 is: f1 / f2345 = 0.399. The focal lengths f1 of the first lens P1, f2 of the second lens P2, f3 of the third lens P3, and f4 of the fourth lens P4 are related as follows: |f1| = 6.74 mm, |f2| = 13.80 mm, |f3| = 23.90 mm, and |f4| = 48.90 mm. The thicknesses H2 of the second lens P2, H3 of the third lens P3, H4 of the fourth lens P4, and H5 of the fifth lens P5 are related as follows: |(H3+H4)-(H2+H5)| = |1.985-1.877| = 0.108. The dispersion coefficients V1 of the first lens P1 and V5 of the fifth lens P5 are related as follows: |V1-V5| = 0.600. The relationship between the sagitta of the object-side surface 31 of the third lens P3 (P3S1) and the sagitta of the image-side surface 32 of the third lens P3 (P3S2) is: P3S1 + P3S2 = 0.006 mm. The relationship between the aperture P1D1 of the object-side surface 11 of the first lens P1 is: P1D1 = 4.821 mm. The relationship between the total length (TTL) and focal length (f′) of the large-aperture mobile phone telephoto lens is: TTL / f′ = 0.947. The relationship between the aperture (F) and focal length (f′) of the large-aperture mobile phone telephoto lens, and the effective aperture P5D2 of the fifth lens P5 is: |f′ / F - P5D2| = 0.352. The relationship between the dispersion coefficient V1 of the first lens P1 and the dispersion coefficient V2 of the second lens P2 is: |V1 - V2| = 36.50. The relationship between the radius of curvature P1R1 of the object side surface 11 of the first lens P1 and the radius of curvature P5R2 of the image side surface 52 of the fifth lens P5 is: |P1R1-P5R2|=1.228. The relationship between the refractive index n1 and the dispersion coefficient V1 of the first lens P1 is: n1=1.57 and V1=57.30. The relationship between the total length TTL of the large-aperture mobile phone telephoto lens and the imaging circle diameter 2H of the large-aperture mobile phone telephoto lens is: TTL / 2H=1.88. The relationship between the total length TTL of the large-aperture mobile phone telephoto lens and the thickness H15 between the first lens P1 and the fifth lens P5 is: H15 / TTL=0.53.

[0098] Figure 17The diagram shows the MTF curve of the large-area mobile phone telephoto lens of Example 3 at infinity. The MTF (Modulation Transfer Function) curve represents the degree of reproduction of the details of the subject onto the image plane by the lens as a function of spatial frequency. At infinity, the MTF curve is close to the diffraction limit, indicating that the lens has very good image quality. Figure 18 The MTF curve of the large-area mobile phone telephoto lens of Example 3 at an object distance of 30cm is shown. The MTF curve at an object distance of 30cm is close to the diffraction limit, and the lens imaging quality is very good. Figure 19 The relative illumination and Y-field diagram of the large-area mobile phone telephoto lens of Example 3 are shown. The relative illumination is greater than 85%, and the screen brightness is uniform. Figure 20 The distortion diagram of the large-area mobile phone telephoto lens of Example 3 is shown. The distortion is less than 1%, and the correction is very good. Figure 21 The diagram shows the axial aberration of the large-area mobile phone telephoto lens of Example 3. When the pupil radius is 2.4100mm, the focal point of different wavelengths of light along the optical axis deviates on the focal plane. The axial deviation is less than 0.02mm, which is a good correction. Figure 22 The diagram shows the lateral chromatic aberration of the large-area mobile phone telephoto lens of Example 3. In the example, at a maximum field of view of 4.200 mm, the focal deviation of different wavelengths of light formed on the imaging plane along a direction perpendicular to the optical axis is within 6 μm, indicating good color reproduction. According to... Figures 17 to 22 As can be seen, the large-area telephoto lens for mobile phones given in Example 3 achieves good imaging quality at different shooting distances.

[0099] In summary, Examples 1, 2, and 3 satisfy the relationships shown in Table 7.

[0100] Table 7:

[0101]

[0102] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A large-aperture telephoto lens for mobile phones, characterized in that, Along the optical axis from the object side to the image side, there are a positive first lens, a negative second lens, a negative third lens, a positive fourth lens, and a negative fifth lens, and the number of lens elements with optical power is five; the first lens to the fifth lens each include an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through. The focal length f1 of the first lens and the combined focal length f2345 of the second to fifth lenses satisfy: 0.3 <f1 / f2345<0.5。 2. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The object-side and image-side of the fifth lens are both W-shaped relative to the imaging plane.

3. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The focal lengths f1 of the first lens, f2 of the second lens, f3 of the third lens, and f4 of the fourth lens satisfy: |f1|<10mm<|f2|<|f3|<|f4|.

4. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The thickness H2 of the second lens, the thickness H3 of the third lens, the thickness H4 of the fourth lens, and the thickness H5 of the fifth lens satisfy: 0.01mm≤|(H3+H4)-(H2+H5)|≤0.2mm.

5. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The object-side height P3S1 and the image-side height P3S2 of the third lens satisfy the following condition: P3S1 + P3S2 < 0.15 mm.

6. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The aperture P1D1 of the object-side surface of the first lens satisfies: 4.5mm. <P1D1<5mm。 7. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The aperture F of the large-aperture mobile phone telephoto lens, the focal length f′ of the large-aperture mobile phone telephoto lens, and the effective aperture P5D2 of the fifth lens satisfy: |f′ / F-P5D2|<0.4mm.

8. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The radius of curvature P1R1 of the object side of the first lens and the radius of curvature P5R2 of the image side of the fifth lens satisfy: |P1R1-P5R2|<1.5mm.

9. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The refractive index n1 of the first lens and the dispersion coefficient V1 of the first lens satisfy: n1 < 1.6 and V1 > 50.

10. The large-area telephoto lens for mobile phones according to claim 1, characterized in that, The total length TTL of the large-target mobile phone telephoto lens, and the thickness H15 between the first lens and the fifth lens, satisfy: H15 / TTL<0.6.

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