Mobile phone lens

Abstract

The embodiment of the invention provides a mobile phone lens. The mobile phone lens comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with negative focal power which are sequentially arranged from an object space to an image space along an optical axis. Wherein the first lens to the seventh lens are all plastic aspheric lenses. According to the mobile phone lens provided by the embodiment of the invention, the structure of seven plastic aspheric lenses is adopted, and aiming at the defects in the prior art, through the design of the shape of the lenses and the reasonable distribution of the focal power of each lens, the design of the mobile phone lens which can give consideration to a large field angle of 103 degrees, a large aperture and a small size is realized.

Description

Technical Field

[0001] This invention relates to the field of lens technology, and more particularly to a mobile phone lens. Background Technology

[0002] The development of mobile phone lens technology has evolved from single-lens to multi-lens cameras, and from basic imaging to advanced functions. Core breakthroughs include pixel increases, optical zoom, periscope structures, and computational photography. With the continuous upgrading of smart devices and the diversification of various digital products, people's demand for optical lenses is also gradually increasing.

[0003] Most mobile phone lenses on the market have a small field of view, or if the field of view is large enough, the lens size is too large, making it difficult to solve various problems at the same time. Summary of the Invention

[0004] This invention provides a mobile phone lens that uses a structure of 7 plastic aspherical lenses. By addressing the shortcomings of existing technologies, and through the design of the lens shape and the reasonable allocation of the optical power of each lens, a mobile phone lens design that can balance a large field of view (up to 103°), a large aperture, and a small size is achieved.

[0005] According to one aspect of the present invention, a mobile phone lens is provided, comprising a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power arranged sequentially along the optical axis from the object side to the image side.

[0006] Among them, the first lens to the seventh lens are all plastic aspherical lenses.

[0007] Optionally, an aperture stop is also included, which is located between the second lens and the third lens.

[0008] Optionally, the third to the seventh lenses form a rear aperture lens group, and the focal length of the rear aperture lens group and the mobile phone lens satisfies:

[0009] 0.96 <f1 / f<1.05;

[0010] Where f1 represents the focal length of the lens group behind the aperture, and f represents the focal length of the mobile phone lens.

[0011] Optionally, the first lens and the second lens form a front aperture lens group, and the focal length of the front aperture lens group and the mobile phone lens satisfies:

[0012] -0.021 <f / f2<0.007;

[0013] Where f2 represents the focal length of the front lens group of the aperture stop, and f represents the focal length of the mobile phone lens.

[0014] Optionally, the mobile phone lens satisfies:

[0015] 2.18 <TTL / f<2.31;

[0016] Where TTL represents the distance from the vertex of the object side of the first lens to the image plane, and f represents the focal length of the mobile phone lens.

[0017] Optionally, the mobile phone lens satisfies:

[0018] 2.82 <TTL / (CT1+CT2+CT3)<3.16;

[0019] Where TTL represents the distance from the vertex of the object side of the first lens to the image plane, and CT1, CT2 and CT3 represent the center thicknesses of the first lens, the second lens and the third lens, respectively.

[0020] Optionally, the mobile phone lens satisfies:

[0021] 0.13 <BF / IMA<0.16;

[0022] Wherein, BF represents the distance from the vertex of the image side of the seventh lens to the image plane, and IMA represents the image plane height of the mobile phone lens.

[0023] Optionally, the mobile phone lens satisfies:

[0024] 0.18 <ENPD / IMA<0.24;

[0025] Wherein, ENPD represents the entrance pupil diameter of the mobile phone lens, and IMA represents the image plane height of the mobile phone lens.

[0026] Optionally, the third lens and the fourth lens are set independently, or the third lens and the fourth lens form a cemented lens.

[0027] Optionally, the focal length f of the mobile phone lens is 4.65mm, the aperture number F of the mobile phone lens is 1.85, and the maximum field of view (FOV) of the mobile phone lens is 103°.

[0028] The mobile phone lens provided in this embodiment of the invention includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power, arranged sequentially from the object side to the image side along the optical axis; wherein, the first lens to the seventh lens are all plastic aspherical lenses. The positive optical power of the first lens and the negative optical power of the second lens help to adjust the aberrations and distortions generated by the lens. The combination of optical powers of the third to seventh lenses helps the lens achieve the required angle. The mobile phone lens provided in this embodiment of the invention adopts a structure of 7 plastic aspherical lenses. Addressing the shortcomings of existing technologies, through the design of the lens shape and the reasonable allocation of the optical powers of each lens, a mobile phone lens design that can balance a large field of view (up to 103°), a large aperture, and a small size is achieved.

[0029] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a mobile phone lens provided in an embodiment of the present invention;

[0032] Figure 2 A field curvature distortion curve of a mobile phone lens is provided as an embodiment of the present invention;

[0033] Figure 3 An axial aberration map of a mobile phone lens provided in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of another mobile phone lens structure provided in an embodiment of the present invention;

[0035] Figure 5 Another field curvature distortion curve of a mobile phone lens provided in an embodiment of the present invention;

[0036] Figure 6 Another axial aberration map of a mobile phone lens provided in an embodiment of the present invention;

[0037] Figure 7This is a schematic diagram of the structure of another mobile phone lens provided in an embodiment of the present invention;

[0038] Figure 8 Another field curvature distortion curve of a mobile phone lens provided in an embodiment of the present invention;

[0039] Figure 9 This is another axial aberration diagram of a mobile phone lens provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] It should be noted that the terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "above," "below," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "above" or "below" another element, it can be formed not only directly "above" or "below" the other element, but also indirectly "above" or "below" the other element through an intermediate element. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are only used to distinguish different components. It should be understood that such terms can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0042] Figure 1 This is a schematic diagram of the structure of a mobile phone lens provided in an embodiment of the present invention, with reference to... Figure 1The mobile phone lens provided in this embodiment of the invention includes a first lens 10 with positive optical power, a second lens 20 with negative optical power, a third lens 30 with positive optical power, a fourth lens 40 with negative optical power, a fifth lens 50 with positive optical power, a sixth lens 60 with negative optical power, and a seventh lens 70 with negative optical power arranged sequentially from the object side to the image side along the optical axis; wherein, the first lens 10 to the seventh lens 70 are all plastic aspherical lenses.

[0043] It is understandable that optical power, the reciprocal of focal length, characterizes the ability of an optical system to deflect light. The larger the absolute value of optical power, the stronger the ability to bend light; the smaller the absolute value, the weaker the ability to bend light. When optical power is positive, the refraction of light is converging; when optical power is negative, the refraction of light is diverging. In practical implementation, refer to... Figure 1 The mobile phone lens also includes a flat glass 80, which is located on the side closest to the image plane. The flat glass 80 protects the photosensitive chip in the image sensor, which converts the light signals collected by the mobile phone lens into electrical signals, thereby ensuring the imaging effect of the mobile phone lens. The first lens 10, second lens 20, third lens 30, fourth lens 40, fifth lens 50, sixth lens 60, seventh lens 70, and flat glass 80 can be housed in a single lens barrel. Figure 1 Within the lens (not shown), incident light is collected by a first lens 10 with positive optical power and a second lens 20 with negative optical power, which helps to adjust aberrations and distortions produced by the lens. The combination of optical powers from the third lens 30 to the seventh lens 70 helps the lens achieve the required angle. The mobile phone lens has a focal length f of 4.65mm, an aperture f of 1.85, and a maximum field of view (FOV) of 103°. It should be noted that... Figure 1 The structural diagrams in the following embodiments are for illustrative purposes only, and shapes such as aspherical surfaces are not represented in accordance with actual conditions.

[0044] The mobile phone lens provided in this embodiment of the invention adopts a structure of 7 plastic aspherical lenses. In view of the shortcomings of the prior art, the design of the lens shape and the reasonable allocation of the optical power of each lens have achieved a mobile phone lens design that can take into account a large field of view, a field of view of up to 103°, a large aperture and a small size.

[0045] Continue to refer to Figure 1 Optionally, the mobile phone lens also includes an aperture 90, which is located between the second lens 20 and the third lens 30.

[0046] The first lens 10 and the second lens 20 before the aperture stop 90 form the front aperture lens group, and the third lens 30 to the seventh lens 70 after the aperture stop 90 form the rear aperture lens group. Optionally, the third lens 30 and the fourth lens 40 can be set independently or the third lens 30 and the fourth lens 40 can form a cemented lens. The focal length of the rear aperture lens group and the mobile phone lens meets the following requirements:

[0047] 0.96 <f1 / f<1.05;

[0048] Where f1 represents the focal length of the lens group behind the aperture stop, and f represents the focal length of the mobile phone lens.

[0049] Optionally, the focal length of the front lens group and the mobile phone lens should meet the following requirements:

[0050] -0.021 <f / f2<0.007;

[0051] Where f2 represents the focal length of the front lens group and f represents the focal length of the mobile phone lens.

[0052] By controlling the focal length of the lens group behind the aperture stop to approximate the overall focal length of the mobile phone lens, it is beneficial for the mobile phone lens to achieve the required angle. Controlling the focal length range of the lens group in front of the aperture stop helps to adjust the aberrations and distortions produced by the mobile phone lens. Satisfying the above conditions ensures that the mobile phone lens achieves a wide field of view.

[0053] Optional, mobile phone lenses meet the following requirements:

[0054] 2.18 <TTL / f<2.31;

[0055] Where TTL represents the distance from the vertex of the object side surface of the first lens 10 to the image surface, and f represents the focal length of the mobile phone lens.

[0056] By setting the TTL / f within the above constraints, the focal length of the mobile phone lens is ensured to be neither too large nor too small, thereby keeping the optical distortion of the mobile phone lens within a controllable and appropriate range, which is beneficial to improving the image quality of the mobile phone lens.

[0057] Optional, mobile phone lenses meet the following requirements:

[0058] 2.82 <TTL / (CT1+CT2+CT3)<3.16;

[0059] Where TTL represents the distance from the vertex of the object side of the first lens 10 to the image plane, and CT1, CT2 and CT3 represent the center thicknesses of the first lens 10, the second lens 20 and the third lens 30, respectively.

[0060] By setting TTL / (CT1+CT2+CT3) within the above constraints, the mobile phone lens can be made small in size and compact in structure without affecting image quality.

[0061] Optional, mobile phone lenses meet the following requirements:

[0062] 0.13 <BF / IMA<0.16;

[0063] Where BF represents the distance from the vertex of the image side of the seventh lens 70 to the image plane, and IMA represents the image plane height of the mobile phone lens.

[0064] Setting the BF / IMA within the above constraints allows for a compact mobile phone lens structure with sufficient back focal length space, facilitating installation.

[0065] Optional, mobile phone lenses meet the following requirements:

[0066] 0.18 <ENPD / IMA<0.24;

[0067] Wherein, ENPD represents the entrance pupil diameter of the mobile phone lens, and IMA represents the image plane height of the mobile phone lens.

[0068] By setting ENPD / IMA within the above constraints, the actual amount of light entering the camera can be increased to meet the requirements of a large aperture, which can reach f / 1.85.

[0069] The lenses in the mobile phone lenses provided in this embodiment of the invention are all aspherical lenses, and the surface of the aspherical lens satisfies the following formula:

[0070] ;

[0071] Where z is the axial sagitta in the Z-direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, numerically the reciprocal of the radius of curvature; k is the conic coefficient; a i For aspherical higher-order terms, the coefficients are given.

[0072] For example, Table 1 shows the relationship with Figure 1 The specific parameters of the corresponding mobile phone lens:

[0073] Table 1 Specific parameters of mobile phone lenses

[0074]

[0075] Table 2 shows the parameter data of each lens in Example 1. The focal length of the mobile phone lens in Example 1 is f=4.65mm.

[0076]

[0077] The surface numbers in Table 2 are assigned according to the surface sequence of each lens; the radius of curvature represents the degree of curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; INF represents infinity, i.e., a plane; the thickness represents the central axial distance between the current surface and the next surface; the refractive index (nd) represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1; the Abbe number (vd) represents the dispersion characteristics of the material between the current surface and the next surface.

[0078] Table 3 shows the design values ​​of the aspherical parameters in Example 1:

[0079]

[0080] Where 1.58449E-02 indicates that the a2 coefficient of surface number 1 is 1.58449 × 10 -2 .

[0081] Figure 2 This invention provides a field curvature distortion curve of a mobile phone lens. Figure 2 In the left-hand coordinate system, the horizontal coordinate represents the magnitude of the field curvature in mm; the vertical coordinate represents the normalized image height, which has no unit; where T represents the meridion and S represents the sagitta; Figure 2 It can be seen that the mobile phone lens provided in this embodiment effectively controls field curvature, that is, during imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of distortion, in percentage (%), and the vertical coordinate represents the normalized image height, which has no unit; Figure 2 As can be seen, the distortion of the mobile phone lens provided in this embodiment has been well corrected, and the imaging distortion is small.

[0082] Figure 3 This invention provides an axial aberration diagram of a mobile phone lens, where the horizontal axis represents the focal position and the vertical axis represents the normalized pupil size. Each line represents a different wavelength, used to analyze the focusing differences of light of different wavelengths. The difference in the focal position of light of different wavelengths reflects the chromatic aberration characteristics of the mobile phone lens. If light of different wavelengths is focused at the same position, it indicates low chromatic aberration; conversely, it indicates high chromatic aberration. Figure 3 It can be seen that the color difference of the mobile phone lens is relatively small.

[0083] Figure 4 This is a schematic diagram of another mobile phone lens structure provided in an embodiment of the present invention. Table 4 shows the structure of the lens. Figure 4 The specific parameters of the corresponding mobile phone lens:

[0084] Table 4 Specific parameters of mobile phone lenses

[0085]

[0086] Table 5 shows the parameter data of each lens in Example 2. The focal length of the mobile phone lens in Example 2 is f=4.65mm.

[0087]

[0088] The surface numbers in Table 5 are assigned according to the surface sequence of each lens, with 7 representing the cemented surface; the radius of curvature represents the degree of curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane, and INF representing infinity, i.e., a plane; the thickness represents the central axial distance between the current surface and the next surface; the refractive index (nd) represents the ability of the material between the current surface and the next surface to deflect light, with a blank space indicating that the current position is air and the refractive index is 1; the Abbe number (vd) represents the dispersion characteristics of the material between the current surface and the next surface.

[0089] Table 6 shows the design values ​​of the aspherical parameters in Example 2:

[0090]

[0091] Where 1.57977E-02 indicates that the a2 coefficient of surface number 1 is 1.57977 × 10 -2 .

[0092] Figure 5 This is another field curvature distortion curve of a mobile phone lens provided in an embodiment of the present invention. Figure 5 In the left-hand coordinate system, the horizontal coordinate represents the magnitude of the field curvature in mm; the vertical coordinate represents the normalized image height, which has no unit; where T represents the meridion and S represents the sagitta; Figure 5 It can be seen that the mobile phone lens provided in this embodiment effectively controls field curvature, that is, during imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of distortion, in percentage (%), and the vertical coordinate represents the normalized image height, which has no unit; Figure 5 As can be seen, the distortion of the mobile phone lens provided in this embodiment has been well corrected, and the imaging distortion is small.

[0093] Figure 6 This invention provides another axial aberration diagram of a mobile phone lens, where the horizontal axis represents the focal position and the vertical axis represents the normalized pupil size. Each line represents a different wavelength, used to analyze the focusing differences of different wavelengths of light. The difference in the focal position of different wavelengths of light reflects the chromatic aberration characteristics of the mobile phone lens. If different wavelengths of light are focused at the same position, it indicates low chromatic aberration; conversely, it indicates high chromatic aberration. Figure 6 It can be seen that the color difference of the mobile phone lens is relatively small.

[0094] Figure 7 This is a schematic diagram of another mobile phone lens provided in an embodiment of the present invention. Table 7 shows the structure of the lens. Figure 7 The specific parameters of the corresponding mobile phone lens:

[0095] Table 7 Specific parameters of mobile phone lenses

[0096]

[0097] Table 8 shows the parameter data of each lens in Example 3. The focal length of the mobile phone lens in Example 3 is f=4.65mm.

[0098]

[0099] The surface numbers in Table 8 are assigned according to the surface sequence of each lens; the radius of curvature represents the degree of curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane; INF represents infinity, i.e., a plane; the thickness represents the central axial distance between the current surface and the next surface; the refractive index (nd) represents the ability of the material between the current surface and the next surface to deflect light; a blank space indicates that the current position is air and the refractive index is 1; the Abbe number (vd) represents the dispersion characteristics of the material between the current surface and the next surface.

[0100] Table 9 shows the design values ​​of the aspherical parameters in Example 3:

[0101]

[0102] Where 1.58367E-02 indicates that the a2 coefficient of surface number 1 is 1.58367 × 10 -2 .

[0103] Figure 8 This is another field curvature distortion curve of a mobile phone lens provided in an embodiment of the present invention. Figure 8 In the left-hand coordinate system, the horizontal coordinate represents the magnitude of the field curvature in mm; the vertical coordinate represents the normalized image height, which has no unit; where T represents the meridion and S represents the sagitta; Figure 8 It can be seen that the mobile phone lens provided in this embodiment effectively controls field curvature, that is, during imaging, the difference between the image quality at the center and the image quality at the periphery is small; in the coordinate system on the right, the horizontal coordinate represents the magnitude of distortion, in percentage (%), and the vertical coordinate represents the normalized image height, which has no unit; Figure 8 As can be seen, the distortion of the mobile phone lens provided in this embodiment has been well corrected, and the imaging distortion is small.

[0104] Figure 9This invention provides another embodiment of an axial aberration diagram for a mobile phone lens. The horizontal axis represents the focal position, and the vertical axis represents the normalized pupil size. Each line represents a different wavelength, used to analyze the focusing differences of different wavelengths of light. The difference in the focal position of different wavelengths of light reflects the chromatic aberration characteristics of the mobile phone lens. If different wavelengths of light are focused at the same position, it indicates low chromatic aberration; conversely, it indicates high chromatic aberration. Figure 9 It can be seen that the color difference of the mobile phone lens is relatively small.

[0105] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A mobile phone lens, characterized in that, It includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with negative optical power, arranged sequentially from the object side to the image side along the optical axis. Among them, the first lens to the seventh lens are all plastic aspherical lenses.

2. The mobile phone lens according to claim 1, characterized in that, It also includes an aperture stop, which is located between the second lens and the third lens.

3. The mobile phone lens according to claim 2, characterized in that, The third to the seventh lenses form a rear aperture lens group, and the focal lengths of the rear aperture lens group and the mobile phone lens satisfy the following: 0.96 <f1 / f<1.05; Where f1 represents the focal length of the lens group behind the aperture, and f represents the focal length of the mobile phone lens.

4. The mobile phone lens according to claim 2, characterized in that, The first lens and the second lens form a front aperture lens group, and the focal length of the front aperture lens group and the mobile phone lens satisfy the following: -0.021 <f / f2<0.007; Where f2 represents the focal length of the front lens group of the aperture stop, and f represents the focal length of the mobile phone lens.

5. The mobile phone lens according to claim 1, characterized in that, The mobile phone lens meets the following requirements: 2.18 <TTL / f<2.31; Where TTL represents the distance from the vertex of the object side of the first lens to the image plane, and f represents the focal length of the mobile phone lens.

6. The mobile phone lens according to claim 1, characterized in that, The mobile phone lens meets the following requirements: 2.82 <TTL / (CT1+CT2+CT3)<3.16; Where TTL represents the distance from the vertex of the object side of the first lens to the image plane, and CT1, CT2 and CT3 represent the center thicknesses of the first lens, the second lens and the third lens, respectively.

7. The mobile phone lens according to claim 1, characterized in that, The mobile phone lens meets the following requirements: 0.13 <BF / IMA<0.16; Wherein, BF represents the distance from the vertex of the image side of the seventh lens to the image plane, and IMA represents the image plane height of the mobile phone lens.

8. The mobile phone lens according to claim 1, characterized in that, The mobile phone lens meets the following requirements: 0.18 <ENPD / IMA<0.24; Wherein, ENPD represents the entrance pupil diameter of the mobile phone lens, and IMA represents the image plane height of the mobile phone lens.

9. The mobile phone lens according to claim 1, characterized in that, The third lens and the fourth lens are set independently, or the third lens and the fourth lens form a cemented lens.

10. The mobile phone lens according to claim 1, characterized in that, The mobile phone lens has a focal length f of 4.65mm, an aperture F of 1.85, and a maximum field of view (FOV) of 103°.

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