Additional distance-increasing portrait lens of mobile phone

Abstract

An additional distance-increasing portrait lens for a mobile phone comprises eight lenses. The first lens R1 is equal to 44.5 to 45.5, and the second lens R2 is equal to 153.5 to 154.5; the R1 of the second lens is equal to 243.5 to 245.5, and the R2 of the second lens is equal to 78 to 79.5; the third lens R1 is equal to 33-34, and R2 is equal to 45-46; a fourth lens R1 is equal to 21.5 to 22.5, and R2 is equal to 76 to 77; the R1 of the fifth lens is equal to 36.5 to 37.5, and the R2 of the fifth lens is equal to 11 to 12; the sixth lens R1 is equal to 11 to 12, and the sixth lens R2 is equal to 44.5 to 45.5; the seventh lens R1 is equal to 44.5 to 45.5, and the seventh lens R2 is equal to 11 to 12; and the R1 of the eighth lens is 16-17, and the R2 of the eighth lens is 72.5-73.5. The lens of the utility model can control field curvature data and distortion data in a small range, well correct the field curvature data and the distortion data, and shoot remote portraits more clearly.

Description

Technical Field

[0001] This utility model relates to the field of lens technology, and in particular to a mobile phone attachment teleconverter portrait lens. Background Technology

[0002] Most smartphones on the market today have integrated camera functionality. The camera lens consists of multiple lenses, which focus external light through the refraction of the convex lens. The aperture controls the amount of light entering the camera. During focusing, a micro motor moves the lens or phase / laser focusing technology is used to ensure that the light falls precisely on the sensor.

[0003] Due to the size limitations of smartphones, they can generally only perform simple shooting and cannot meet the needs of some high-end users for long-distance shooting, optical zoom, and high-definition shooting.

[0004] To achieve better photo results, some advanced users often install an external lens on their phone's main camera, increasing the original focal length and significantly improving image quality. However, when shooting portraits, these lenses exhibit noticeable field curvature and distortion, making correction difficult, and resulting in suboptimal performance when photographing distant figures. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a mobile phone attachment teleconverter for portrait photography, which can control field curvature data and distortion data within a small range, thereby achieving better correction and clearer shooting of distant portraits.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A mobile phone additional teleconverter portrait lens, comprising, from the object side to the imaging plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the fifth lens, the sixth lens, and the seventh lens are cemented together to form a combined lens with negative optical power;

[0008] The optical centers of all lenses are located on the same straight line. The radius of curvature of the mirror surface of each lens facing the object side is represented by R1, and the radius of curvature of the mirror surface of each lens facing the imaging plane is represented by R2.

[0009] The first lens has R1=44.5-45.5mm and R2=153.5-154.5mm; the second lens has R1=243.5-245.5mm and R2=78.0-79.5mm; the third lens has R1=33.0-34.0mm and R2=45.0-46.0mm; the fourth lens has R1=21.5-22.5mm and R2=76-77mm. The fifth lens has R1=36.5-37.5mm and R2=11.0-12.0mm; the sixth lens has R1=11.0-12.0mm and R2=44.5-45.5mm; the seventh lens has R1=44.5-45.5mm and R2=11.0-12.0mm; and the eighth lens has R1=16.0-17.0mm and R2=72.5-73.5mm.

[0010] The air gap between the first and second lenses is 4.0-5.5 mm; the air gap between the second and third lenses is 0-0.6 mm; the air gap between the third and fourth lenses is 0-0.6 mm; the air gap between the fourth and fifth lenses is 0.3-1.5 mm; the air gap between the fifth and sixth lenses is 0 mm; the air gap between the sixth and seventh lenses is 0 mm; and the air gap between the seventh and eighth lenses is 0.5-2.0 mm.

[0011] In one embodiment,

[0012] N of the first lens d The value is 1.56883, V d The value is 56.04;

[0013] N of the second lens d The value is 1.80518, V d The value is 25.46;

[0014] N of the third lens d The value is 1.84666, V d The value is 23.78;

[0015] N of the fourth lens d The value is 1.52307, V d The value is 58.64;

[0016] N of the fifth lens d The value is 1.91082, V d The value is 35.

[0017] N of the sixth lens d The value is 1.51742, V d The value is 52.15;

[0018] N of the seventh lens dThe value is 1.91082, V d The value is 35.25;

[0019] N of the eighth lens d The value is 1.69894, V d The value is 30.05.

[0020] In one embodiment,

[0021] The center thickness of the first lens is 11.3-11.6 mm;

[0022] The center thickness of the second lens is 1.5-2.0 mm;

[0023] The center thickness of the third lens is 7.0-7.8 mm;

[0024] The center thickness of the fourth lens is 12.0-13.0 mm;

[0025] The center thickness of the fifth lens is 2.0-3.0 mm;

[0026] The center thickness of the sixth lens is 8.2-9.0 mm;

[0027] The center thickness of the seventh lens is 1.0-1.7 mm;

[0028] The center thickness of the eighth lens is 2.6-3.7 mm.

[0029] In one embodiment,

[0030] The diameter of the first lens is 55-65mm;

[0031] The diameter of the second lens is 55-80mm;

[0032] The diameter of the third lens is 46-55mm;

[0033] The diameter of the fourth lens is 35-42mm;

[0034] The diameter of the fifth lens is 28-43mm;

[0035] The diameter of the sixth lens is 18-21mm;

[0036] The diameter of the seventh lens is 15-22mm;

[0037] The diameter of the eighth lens is 8-17mm.

[0038] This utility model provides a mobile phone attachment teleconverter for portrait photography, which can control field curvature and distortion data within a small range, thereby achieving better correction and capturing distant portraits more clearly. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model 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.

[0040] Figure 1 A schematic diagram of the cross-sectional structure of a mobile phone additional teleconverter portrait lens according to an embodiment of the present invention;

[0041] Figure 2 for Figure 1 The optical path diagram of a mobile phone with an attached teleconverter for portrait photography is shown.

[0042] Figure 3 for Figure 1 The field curvature and distortion diagrams of the mobile phone's attached telephoto portrait lens are shown.

[0043] Figure 4 for Figure 1 The diagram shown is a dot matrix of a mobile phone with an attached telephoto lens for portrait photography.

[0044] Figure 5 for Figure 1 The diffraction MTF diagram of a mobile phone with an attached teleconverter portrait lens is shown.

[0045] Detailed Implementation

[0046] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0047] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0049] Please refer to the following: Figure 1 and Figure 2 This utility model discloses a mobile phone additional teleconverter portrait lens 10, which, from the object side to the imaging plane, includes: a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, a fifth lens G5, a sixth lens G6, a seventh lens G7, and an eighth lens G8. The fifth lens G5, the sixth lens G6, and the seventh lens G7 are cemented together to form a combined lens with negative optical power. The optical path principle of this utility model can effectively increase the generation of a natural background blur effect outside the focused subject in captured images or videos.

[0050] like Figure 1 As shown, the optical centers of each lens are located on the same straight line. The radius of curvature of the mirror surface of each lens facing the object side is represented by R1, and the radius of curvature of the mirror surface of each lens facing the imaging plane is represented by R2.

[0051] Table 1

[0052] Nd Vd R1 (mm) R2 (mm) Center thickness (mm) Diameter (mm) First lens G1 1.56883 56.04 44.5-45.5 153.5-154.5 11.3-11.6 55-65 Second lens G2 1.80518 25.46 243.5-245.5 78.0-79.5 1.5-2.0 55-80 Third lens G3 1.84666 23.78 33.0-34.0 45.0-46.0 7.0-7.8 46-55 Fourth lens G4 1.52307 58.64 21.5-22.5 76-77 12.0-13.0 35-42 Fifth lens G5 1.91082 35.25 36.5-37.5 11.0-12.0 2.0-3.0 28-43 Sixth lens G6 1.51742 52.15 11.0-12.0 44.5-45.5 8.2-9.0 18-21 Seventh lens G7 1.91082 35.25 44.5-45.5 11.0-12.0 1.0-1.7 15-22 Eighth lens G8 1.69894 30.05 16.0-17.0 72.5-73.5 2.6-3.7 8-17

[0053] As shown in Table 1 above, the first lens has R1 = 44.5-45.5 mm and R2 = 153.5-154.5 mm; the second lens has R1 = 243.5-245.5 mm and R2 = 78.0-79.5 mm; the third lens has R1 = 33.0-34.0 mm and R2 = 45.0-46.0 mm; and the fourth lens has R1 = 21.5-22.5 mm and R2 = 76-77.5 mm. 7mm; the fifth lens has R1=36.5-37.5mm, R2=11.0-12.0mm; the sixth lens has R1=11.0-12.0mm, R2=44.5-45.5mm; the seventh lens has R1=44.5-45.5mm, R2=11.0-12.0mm; the eighth lens has R1=16.0-17.0mm, R2=72.5-73.5mm;

[0054] Furthermore, the air gap between the first lens and the second lens is 4.0-5.5 mm; the air gap between the second lens and the third lens is 0-0.6 mm; the air gap between the third lens and the fourth lens is 0-0.6 mm; the air gap between the fourth lens and the fifth lens is 0.3-1.5 mm; the air gap between the fifth lens and the sixth lens is 0; the air gap between the sixth lens and the seventh lens is 0; and the air gap between the seventh lens and the eighth lens is 0.5-2.0 mm.

[0055] As shown in Table 1 above, N d The value represents the d-line refractive index of the material, N. d The value represents the Abbe number of the material, determined by N. d Value and N d The value determines which type of material to use.

[0056] As shown in Table 1 above, N of the first lens d The value is 1.56883, V d The value is 56.04; N of the second lens d The value is 1.80518, V d The value is 25.46; N of the third lens d The value is 1.84666, V d The value is 23.78; N of the fourth lens d The value is 1.52307, V d The value is 58.64; N of the fifth lens d The value is 1.91082, V d The value is 35.25; N of the sixth lens d The value is 1.51742, V d The value is 52.15; N of the seventh lens d The value is 1.91082, V d The value is 35.25; N of the eighth lens d The value is 1.69894, V d The value is 30.05.

[0057] As shown in Table 1 above, the center thickness of the first lens is 11.3-11.6 mm; the center thickness of the second lens is 1.5-2.0 mm; the center thickness of the third lens is 7.0-7.8 mm; the center thickness of the fourth lens is 12.0-13.0 mm; the center thickness of the fifth lens is 2.0-3.0 mm; the center thickness of the sixth lens is 8.2-9.0 mm; the center thickness of the seventh lens is 1.0-1.7 mm; and the center thickness of the eighth lens is 2.6-3.7 mm.

[0058] In this invention, the fifth lens G5, the sixth lens G6, and the seventh lens G7 are cemented together to form a combined lens with negative optical power. The radius of curvature of the fifth lens G5 facing the object side (R1=36.5-37.5mm) is greater than the radius of curvature of the seventh lens G7 facing the imaging plane (R2=11.0-12.0mm), which helps to reduce chromatic aberration of the lens.

[0059] like Figure 3 As shown, the smaller the data range of the field curvature curve and the distortion curve, the better the lens performance. The field curvature range of the mobile phone attached teleconverter portrait lens 10 of this utility model is between -20μm and +20μm, and the distortion range is between -5 and +5, indicating that the field curvature and distortion in this embodiment can be well corrected.

[0060] like Figure 4 The point chart shown and Figure 5 As can be seen from the diffraction MTF pattern shown, the portrait lens attached to the mobile phone of this utility model has high clarity.

[0061] Preferably, the diameter of the first lens is 55-65mm; the diameter of the second lens is 55-80mm; the diameter of the third lens is 46-55mm; the diameter of the fourth lens is 35-42mm; the diameter of the fifth lens is 28-43mm; the diameter of the sixth lens is 18-21mm; the diameter of the seventh lens is 15-22mm; and the diameter of the eighth lens is 8-17mm.

[0062] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A mobile phone attachment teleconverter for portrait photography, characterized in that, From the object side to the imaging plane, the lens consists of: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the fifth lens, the sixth lens, and the seventh lens are cemented together to form a composite lens with negative optical power. The optical centers of all lenses are located on the same straight line. The radius of curvature of the mirror surface of each lens facing the object side is represented by R1, and the radius of curvature of the mirror surface of each lens facing the imaging plane is represented by R2. The first lens has R1=44.5-45.5mm and R2=153.5-154.5mm; the second lens has R1=243.5-245.5mm and R2=78.0-79.5mm; the third lens has R1=33.0-34.0mm and R2=45.0-46.0mm; the fourth lens has R1=21.5-22.5mm and R2=76-77mm. The fifth lens has R1=36.5-37.5mm and R2=11.0-12.0mm; the sixth lens has R1=11.0-12.0mm and R2=44.5-45.5mm; the seventh lens has R1=44.5-45.5mm and R2=11.0-12.0mm; and the eighth lens has R1=16.0-17.0mm and R2=72.5-73.5mm. The air gap between the first and second lenses is 4.0-5.5 mm; the air gap between the second and third lenses is 0-0.6 mm; the air gap between the third and fourth lenses is 0-0.6 mm; the air gap between the fourth and fifth lenses is 0.3-1.5 mm; the air gap between the fifth and sixth lenses is 0 mm; the air gap between the sixth and seventh lenses is 0 mm; and the air gap between the seventh and eighth lenses is 0.5-2.0 mm.

2. The mobile phone additional teleconverter portrait lens according to claim 1, characterized in that, N of the first lens d The value is 1.56883, V d The value is 56.04; N of the second lens d The value is 1.80518, V d The value is 25.46; N of the third lens d The value is 1.84666, V d The value is 23.78; N of the fourth lens d The value is 1.52307, V d The value is 58.64; N of the fifth lens d The value is 1.91082, V d The value is 35.25; N of the sixth lens d The value is 1.51742, V d The value is 52.15; N of the seventh lens d The value is 1.91082, V d The value is 35.25; N of the eighth lens d The value is 1.69894, V d The value is 30.

05.

3. The mobile phone additional teleconverter portrait lens according to claim 1, characterized in that, The center thickness of the first lens is 11.3-11.6 mm; The center thickness of the second lens is 1.5-2.0 mm; The center thickness of the third lens is 7.0-7.8 mm; The center thickness of the fourth lens is 12.0-13.0 mm; The center thickness of the fifth lens is 2.0-3.0 mm; The center thickness of the sixth lens is 8.2-9.0 mm; The center thickness of the seventh lens is 1.0-1.7 mm; The center thickness of the eighth lens is 2.6-3.7 mm.

4. The mobile phone additional teleconverter portrait lens according to claim 1, characterized in that, The diameter of the first lens is 55-65mm; The diameter of the second lens is 55-80mm; The diameter of the third lens is 46-55mm; The diameter of the fourth lens is 35-42mm; The diameter of the fifth lens is 28-43mm; The diameter of the sixth lens is 18-21mm; The diameter of the seventh lens is 15-22mm; The diameter of the eighth lens is 8-17mm.

Images