Lens group and electronic equipment

Abstract

The utility model provides a lens group and electronic equipment. The lens group comprises: a first lens with positive refractive power, the focal length of which is f1, and 2.74 < = f1 < = 2.86; the focal length of the second lens is f2, and f2 is larger than or equal to-14.9 and smaller than or equal to-6.1; the focal length of the third lens is f3, and f3 is larger than or equal to 1.30 and smaller than or equal to 2.91; the focal length of the fourth lens is f4, and f4 is larger than or equal to-4.6 and smaller than or equal to-1.4; wherein the first lens, the second lens, the third lens and the fourth lens are sequentially arranged from the object side to the image side of a light path.

Description

Technical Field

[0001] The present application relates to the field of lens technology, and in particular to a lens assembly and an electronic device. Background Art

[0002] The lens on the electronic product enables the electronic product to have the image acquisition function, and the image acquisition function has become an important feature of electronic products and one of the main indicators for evaluating the performance of electronic products.

[0003] In order to obtain better imaging quality and match the sensors with increasing pixel count, the number of lenses in the lens is increasing, which leads to an increase in the thickness of electronic products. However, this is contrary to the current trend of thin and light electronic products. Utility Model Content

[0004] The present application provides a lens assembly and an electronic device, and the technical solution is as follows:

[0005] In a first aspect, an embodiment of the present application provides a lens assembly, comprising:

[0006] A first lens having positive refractive power, a focal length of f1, and 2.74≤f1≤2.86;

[0007] A second lens having negative refractive power, a focal length of f2, and -14.9≤f2≤-6.1;

[0008] a third lens element having positive refractive power, a focal length of f3, and 1.30≤f3≤2.91;

[0009] a fourth lens element having negative refractive power, a focal length of f4, and -4.6≤f4≤-1.4;

[0010] Wherein, the first lens, the second lens, the third lens and the fourth lens are arranged in sequence from the object side to the image side of the optical path.

[0011] In some embodiments, the focal length of the lens group is f, and satisfies the following relationship:

[0012] 1.20≤f1 / f≤1.33;

[0013] -6.68≤f2 / f≤-2.88;

[0014] 0.60≤f3 / f≤1.30;

[0015] -2.15≤f4 / f≤-0.66.

[0016] In some embodiments, the total optical length of the lens group is TTL, and TTL≤2.9 mm.

[0017] In some embodiments, the on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, the on-axis thickness of the third lens is d5, and the on-axis thickness of the fourth lens is d7; and,

[0018] 0.10≤d1 / TTL≤0.16;

[0019] 0.04≤d3 / TTL≤0.07;

[0020] 0.14≤d5 / TTL≤0.29;

[0021] 0.08≤d7 / TTL≤0.17.

[0022] In some embodiments, the imaging height of the lens group is IH, and TTL / IH≤1.26.

[0023] In some embodiments, the lens assembly further includes at least one of the following:

[0024] The curvature radii of the first lens on the object side and the image side are R1 and R2 respectively, and satisfy -2.05≤(R1+R2) / (R1-R2)≤-1.63;

[0025] The curvature radii of the second lens on the object side and the image side are R3 and R4 respectively, and satisfy -1.80≤(R3+R4) / (R3-R4)≤0.37;

[0026] The curvature radii of the third lens on the object side and the image side are R5 and R6 respectively, and satisfy 1.53≤(R5+R6) / (R5-R6)≤3.15;

[0027] The curvature radii of the fourth lens on the object side and the image side are R7 and R8 respectively, and satisfy 1.47≤(R7+R8) / (R7-R8)≤3.76.

[0028] In some embodiments, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, and the refractive index of the fourth lens is n4; and,

[0029] 1.50≤n1≤1.55;

[0030] 1.60≤n2≤1.67;

[0031] 1.50≤n3≤1.55;

[0032] 1.50≤n4≤1.55.

[0033] In some embodiments, the Abbe number of any one of the first lens, the third lens, and the fourth lens is greater than the Abbe number of the second lens, and the difference between the Abbe number of any one of the first lens, the third lens, and the fourth lens and the Abbe number of the second lens is greater than 30.

[0034] In some embodiments, the field of view angle of the lens group is FOV, and FOV≥89°; or, an aperture is provided on the side of the first lens away from the second lens, and the aperture number of the aperture is F, and F≤2.20.

[0035] In a second aspect, an embodiment of the present application provides an electronic device, comprising: a lens group as described in any one of the above.

[0036] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of the exploded structure of the lens assembly provided in the first embodiment of the present application;

[0039] Figure 2 The three different wavelengths of light provided in the first embodiment of the present application pass through Figure 1 Schematic diagram of axial chromatic aberration after the lens group in;

[0040] Figure 3 The three different wavelengths of light provided in the first embodiment of the present application pass through Figure 1 Schematic diagram of chromatic aberration of magnification after the lens group in FIG.

[0041] Figure 4 The three different wavelengths of light provided in the first embodiment of the present application pass through Figure 1 Schematic diagram of field curvature and distortion after the lens group in ;

[0042] Figure 5 A schematic diagram of the exploded structure of a lens assembly provided in the second embodiment of the present application;

[0043] Figure 6 The three different wavelengths of light provided in the second embodiment of the present application pass through Figure 5 Schematic diagram of axial chromatic aberration after the lens group in;

[0044] Figure 7 The three different wavelengths of light provided in the second embodiment of the present application pass through Figure 5 Schematic diagram of chromatic aberration of magnification after the lens group in FIG.

[0045] Figure 8 The three different wavelengths of light provided in the second embodiment of the present application pass through Figure 5 Schematic diagram of field curvature and distortion after the lens group in ;

[0046] Fig. 9 A schematic diagram of the exploded structure of a lens assembly provided in the third embodiment of the present application;

[0047] Fig.10 The three different wavelengths of light provided in the third embodiment of the present application pass through Fig. 9 Schematic diagram of axial chromatic aberration after the lens group in;

[0048] Fig.11 The three different wavelengths of light provided in the third embodiment of the present application pass through Fig. 9 Schematic diagram of chromatic aberration of magnification after the lens group in FIG.

[0049] Fig.12 The three different wavelengths of light provided in the third embodiment of the present application pass through Fig. 9 Schematic diagram of field curvature and distortion after the lens group in ;

[0050] Fig.13 A schematic diagram of the exploded structure of a lens assembly provided in a fourth embodiment of the present application;

[0051] Fig.14 The three different wavelengths of light provided in the fourth embodiment of the present application pass through Fig.13 Schematic diagram of axial chromatic aberration after the lens group in;

[0052] Fig.15 The three different wavelengths of light provided in the fourth embodiment of the present application pass through Fig.13 Schematic diagram of chromatic aberration of magnification after the lens group in FIG.

[0053] Fig.16 The three different wavelengths of light provided in the fourth embodiment of the present application pass through Fig.13 Schematic diagram of field curvature and distortion after the lens group in .

[0054] Description of reference numerals:

[0055] 10. Lens group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 15. Aperture; 16. Optical filter; 17. Imaging surface. DETAILED DESCRIPTION

[0056] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions of the following examples and the accompanying drawings are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0057] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0058] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0059] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0060] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0061] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0062] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0063] First aspect

[0064] The present application embodiment provides a lens assembly 10, see Figures 1 to 16 As shown, it includes:

[0065] A first lens 11 with positive refractive power, a focal length of f1, and 2.74≤f1≤2.86;

[0066] A second lens 12 with negative refractive power, a focal length of f2, and -14.9≤f2≤-6.1;

[0067] a third lens element 13 having positive refractive power, a focal length of f3, and 1.30≤f3≤2.91;

[0068] a fourth lens element 14 having negative refractive power, a focal length of f4, and -4.6≤f4≤-1.4;

[0069] The first lens 11 , the second lens 12 , the third lens 13 and the fourth lens 14 are sequentially arranged from the object side to the image side of the optical path.

[0070] The lens group 10 can be set on the first body of the laptop computer with a display, or on the second body of the laptop computer with input buttons (the second body and the first body are two bodies that can rotate relative to each other), or on a tablet computer, or on a mobile phone, or on other electronic devices such as a television, or an all-in-one computer.

[0071] The first lens 11 is a lens with positive refractive power, and its focal length range is 2.74≤f1≤2.86. In this way, a lens with positive refractive power within the focal length range can be selected according to actual conditions, for example, according to the requirement that the total length of the lens group 10 is small, a lens with positive refractive power of a suitable focal length can be selected. The second lens 12 is a lens with negative refractive power, and its focal length range is -14.9≤f2≤-6.1. In this way, a lens with negative refractive power within the focal length range can be selected according to actual conditions, for example, according to the requirement that the total length of the lens group 10 is small, a lens with negative refractive power of a suitable focal length can be selected. The third lens 13 is a lens with positive refractive power, and its focal length range is 1.30≤f3≤2.91. In this way, a lens with positive refractive power within the focal length range can be selected according to actual conditions, for example, according to the requirement that the total length of the lens group 10 is small, a lens with positive refractive power of a suitable focal length can be selected. The fourth lens 14 is a lens with negative refractive power, and its focal length range is -4.6≤f4≤-1.4. In this way, a lens with negative refractive power within the focal length range can be selected according to actual conditions, for example, according to the requirement of a smaller total length of the lens group 10, a lens with negative refractive power of a suitable focal length can be selected. Here, the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 can all be made of plastic, and the optical surfaces are all conventional even-order aspheric surfaces, so as to save processing costs. Of course, in other embodiments, at least one of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 can also be made of glass.

[0072] In this embodiment, the first lens 11 with positive refractive power, the second lens 12 with negative refractive power, the third lens 13 with positive refractive power and the fourth lens 14 with negative refractive power are arranged in sequence from the object side to the image side. The refractive power is matched with positive and negative symmetry, which is beneficial to correct the field curvature of the lens group 10 and shorten the total length of the lens group 10. Moreover, each lens has a focal length setting range, so that different selection settings can be made, and the refractive power of each lens can be controlled / adjusted, so as to further achieve better imaging quality and effectively reduce the total length of the lens group 10. Since the total length of the lens group 10 is reduced, the lens group 10 can meet the current trend of thin and light electronic products. In addition, the lens group 10 composed of four different refractive powers and corresponding focal lengths can obtain excellent imaging quality and matching pixels with a small number of lenses, and can meet the current trend of thin and light electronic products.

[0073] In some embodiments, see Figures 1 to 16As shown, the focal length of the lens group 10 is f, and satisfies the following relationships: 1.20≤f1 / f≤1.33; -6.68≤f2 / f≤-2.88; 0.60≤f3 / f≤1.30; -2.15≤f4 / f≤-0.66. In this way, the refractive power of each lens can be further controlled / adjusted, so as to achieve better imaging quality and effectively reduce the total length of the lens group 10.

[0074] In some embodiments, see Figures 1 to 16 As shown, the total optical length of the lens group 10 is TTL, and TTL≤2.9 mm. In this way, the ultra-thin design requirement can be further met.

[0075] In some embodiments, see Figures 1 to 16 As shown, the axial thickness of the first lens 11 is d1, the axial thickness of the second lens 12 is d3, the axial thickness of the third lens 13 is d5, and the axial thickness of the fourth lens 14 is d7; and 0.10≤d1 / TTL≤0.16; 0.04≤d3 / TTL≤0.07; 0.14≤d5 / TTL≤0.29; 0.08≤d7 / TTL≤0.17. In this way, the total length of the lens group 10 is further shortened.

[0076] In some embodiments, see Figures 1 to 16 As shown, the imaging height of the lens group 10 is IH, and TTL / IH≤1.26. When the total optical length TTL of the lens group 10 is ≤2.9mm, it is more conducive to adapting to high-definition resolution and miniaturized camera module products. Exemplarily, the imaging height of the lens group 10 is IH=2.305mm. Taking 1pixel=1um as an example (Sony IMX471), the full field of view imaging range of the lens group 10 is 4610*4610 pixels to meet the design requirements of outputting 4K high-definition images.

[0077] In some embodiments, see Figures 1 to 16 As shown, the lens group 10 further includes at least one of the following: the first lens 11 has a curvature radius of R1 and R2 on the object side and the image side, respectively, and satisfies -2.05≤(R1+R2) / (R1-R2)≤-1.63; the second lens 12 has a curvature radius of R3 and R4 on the object side and the image side, respectively, and satisfies -1.80≤(R3+R4) / (R3-R4)≤0.37; the third lens 13 has a curvature radius of R5 and R6 on the object side and the image side, respectively, and satisfies 1.53≤(R5+R6) / (R5-R6)≤3.15; the fourth lens 14 has a curvature radius of R7 and R8 on the object side and the image side, respectively, and satisfies 1.47≤(R7+R8) / (R7-R8)≤3.76. In this way, the total length of the lens group 10 can be effectively reduced.

[0078] In some embodiments, see Figures 1 to 16 As shown, the refractive index of the first lens 11 is n1, the refractive index of the second lens 12 is n2, the refractive index of the third lens 13 is n3, and the refractive index of the fourth lens 14 is n4; and 1.50≤n1≤1.55; 1.60≤n2≤1.67; 1.50≤n3≤1.55; 1.50≤n4≤1.55. In this way, it is beneficial to achieve a more appropriate match of the optical materials of each lens.

[0079] In some embodiments, see Figures 1 to 16 As shown, the Abbe number of any lens among the first lens 11, the third lens 13 and the fourth lens 14 is greater than the Abbe number of the second lens 12, and the difference between the Abbe number of any lens among the first lens 11, the third lens 13 and the fourth lens 14 and the Abbe number of the second lens 12 is greater than 30. This is beneficial to correcting system chromatic aberration.

[0080] In some embodiments, see Figures 1 to 16 As shown, the field of view of the lens group 10 is FOV, and FOV ≥ 89°; or, the first lens 11 is provided with an aperture 15 on the side away from the second lens 12, and the aperture number of the aperture 15 is F, and F ≤ 2.20. Among them, the field of view of the lens group 10 is FOV, and FOV ≥ 89°, so that the design requirements of wide angle can be met; the first lens 11 is provided with an aperture 15 on the side away from the second lens 12, and the aperture number of the aperture 15 is F, and F ≤ 2.20, so as to meet the design requirements of large aperture.

[0081] Embodiment 1:

[0082] Figure 1 This is a schematic diagram of the exploded structure of the lens assembly provided in Example 1 of the present application, Figure 2 This is a schematic diagram of axial chromatic aberration of light with wavelengths of 486 nm, 588 nm and 656 nm after passing through the lens group of Example 1 provided in Example 1 of the present application, Figure 3 This is a schematic diagram of magnification chromatic aberration after light with wavelengths of 486nm, 588nm and 656nm provided in Example 1 of the present application passes through the lens group of Example 1, Figure 4 This is a schematic diagram of field curvature and distortion of light with wavelengths of 486nm, 588nm and 656nm after passing through the lens group of Example 1 provided in Example 1 of the present application, Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. Figures 2 to 4 The red line in the figure corresponds to a wavelength of 486nm, the green line corresponds to a wavelength of 588nm, and the blue line corresponds to a wavelength of 656nm.

[0083] See also Figures 1 to 4As shown, this embodiment provides a lens group 10, which includes: an aperture 15, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14 and an optical filter 16 arranged in sequence from the object side to the image side of the optical path, the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 are all made of plastic material, and the optical surfaces are all conventional even-order aspheric surfaces, the optical filter 16 is preferably an infrared filter, which can filter out infrared light, and the side of the optical filter 16 away from the fourth lens 14 is an imaging surface 17; the Abbe number of any lens of the first lens 11, the third lens 13 and the fourth lens 14 is greater than the Abbe number of the second lens 12, and the difference between the Abbe number of any lens of the first lens 11, the third lens 13 and the fourth lens 14 and the Abbe number of the second lens 12 is greater than 30.

[0084] The focal length of the lens group 10 is f, the first lens 11 is a lens with a focal length of f1 and a positive refractive power, the second lens 12 is a lens with a focal length of f2 and a negative refractive power, the third lens 13 is a lens with a focal length of f3 and a positive refractive power, and the fourth lens 14 is a lens with a focal length of f4 and a negative refractive power; the axial thickness of the first lens 11 is d1, the axial thickness of the second lens 12 is d3, the axial thickness of the third lens 13 is d5, and the axial thickness of the fourth lens 14 is d7; the refractive index of the first lens 11 is n1, the refractive index of the second lens 12 is n2, the refractive index of the third lens 13 is n3, and the refractive index of the fourth lens 14 is d7. The refractive index of 14 is n4; the object side surface of the first lens 11 has a curvature radius of R1, the image side surface of the first lens 11 has a curvature radius of R2, the object side surface of the second lens 12 has a curvature radius of R3, the image side surface of the second lens 12 has a curvature radius of R4, the object side surface of the third lens 13 has a curvature radius of R5, the image side surface of the third lens 13 has a curvature radius of R6, the object side surface of the fourth lens 14 has a curvature radius of R7, and the image side surface of the fourth lens 14 has a curvature radius of R8; the total optical length of the lens group 10 is TTL; the field of view of the lens group is FOV; the imaging height of the lens group 10 is IH; wherein the lens group 10 satisfies the following setting conditions:

[0085] 2.74≤f1≤2.86;

[0086] -14.9≤f2≤-6.1;

[0087] 1.30≤f3≤2.91;

[0088] -4.6≤f4≤-1.4;

[0089] 1.20≤f1 / f≤1.33;

[0090] -6.68≤f2 / f≤-2.88;

[0091] 0.60≤f3 / f≤1.30;

[0092] -2.15≤f4 / f≤-0.66;

[0093] 0.10≤d1 / TTL≤0.16;

[0094] 0.04≤d3 / TTL≤0.07;

[0095] 0.14≤d5 / TTL≤0.29;

[0096] 0.08≤d7 / TTL≤0.17;

[0097] 1.50≤n1≤1.55;

[0098] 1.60≤n2≤1.67;

[0099] 1.50≤n3≤1.55;

[0100] 1.50≤n4≤1.55;

[0101] -2.05≤(R1+R2) / (R1-R2)≤-1.63;

[0102] -1.80≤(R3+R4) / (R3-R4)≤0.37;

[0103] 1.53≤(R5+R6) / (R5-R6)≤3.15;

[0104] 1.47≤(R7+R8) / (R7-R8)≤3.76;

[0105] TTL≤2.9mm;

[0106] FOV ≥ 89°;

[0107] TTL / IH≤1.26.

[0108] The following are the relevant data of the lens assembly 10 of Example 1:

[0109] Table 1 shows the design data of the lens group 10 of Example 1

[0110]

[0111] The meanings of the symbols are as follows:

[0112] S1: aperture;

[0113] R1: radius of curvature of the object side surface of the first lens 11;

[0114] R2: radius of curvature of the image side surface of the first lens 11;

[0115] R3: radius of curvature of the object side surface of the second lens 12;

[0116] R4: radius of curvature of the image side surface of the second lens 12;

[0117] R5: radius of curvature of the object side surface of the third lens 13;

[0118] R6: radius of curvature of the image side surface of the third lens 13;

[0119] R7: radius of curvature of the object side surface of the fourth lens 14;

[0120] R8: radius of curvature of the image side surface of the fourth lens 14;

[0121] R9: radius of curvature of the object side of the optical filter 16;

[0122] R10: radius of curvature of the image side of the optical filter 16;

[0123] dO: axial distance from the aperture 15 to the object side surface of the first lens 11;

[0124] d1: axial thickness of the first lens 11;

[0125] d2: the axial distance from the image side surface of the first lens 11 to the object side surface of the second lens 12;

[0126] d3: axial thickness of the second lens 12;

[0127] d4: the axial distance from the image side surface of the second lens 12 to the object side surface of the second lens 12;

[0128] d5: axial thickness of the third lens 13;

[0129] d6: the axial distance from the image side surface of the third lens 13 to the object side surface of the second lens 12;

[0130] d7: axial thickness of the fourth lens 14;

[0131] d8: the axial distance from the image side surface of the fourth lens 14 to the object side surface of the optical filter 16;

[0132] d9: axial thickness of the optical filter 16;

[0133] d10: the axial distance from the image side to the image plane of the optical filter 1F;

[0134] nd1: the refractive index of the d-line of the first lens 11;

[0135] nd2: the refractive index of the d-line of the second lens 12;

[0136] nd3: the refractive index of the third lens 13 at the d-line;

[0137] nd4: the refractive index of the fourth lens element 14 at the d-line;

[0138] v1: Abbe number of the first lens 11;

[0139] v2: Abbe number of the second lens 12;

[0140] v3: Abbe number of the third lens 13;

[0141] v4: Abbe number of the fourth lens 14.

[0142] Table 2 is the aspheric surface data of each lens in Example 1

[0143]

[0144] Wherein, k is a cone coefficient, A4, A6, A8, A10, A12, A14, A16 are aspheric coefficients, and aspheric data of each lens in the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 can use the aspheric coefficients shown in the following formula, but are not limited to the aspheric polynomial form represented by the following formula.

[0145]

[0146] Table 3 shows the setting conditions and corresponding specific values ​​of Example 1

[0147]

[0148]

[0149] Obviously, the lens group 10 of Example 1 satisfies the conditional expressions of various setting conditions.

[0150] In this embodiment, the entrance pupil diameter of the lens group 10 is 0.9784 mm, the full field of view image height is 2.305 mm, and the field of view angle in the diagonal direction is 92.8°, so that the lens group 10 can achieve the purposes of wide angle, ultra-thinness, and large aperture, so as to be suitable for the lens design of high-definition notebooks composed of high-pixel CMOS and other imaging elements, and its on-axis and off-axis chromatic aberrations are fully corrected to have excellent optical characteristics.

[0151] Embodiment 2:

[0152] Figure 5 This is a schematic diagram of the exploded structure of the lens assembly provided in Example 2 of the present application, Figure 6 This is a schematic diagram of axial chromatic aberration of light with wavelengths of 486 nm, 588 nm and 656 nm after passing through the lens group of Example 2 provided in Example 2 of the present application, Figure 7This is a schematic diagram of magnification chromatic aberration after light with wavelengths of 486nm, 588nm and 656nm provided in Example 2 of the present application passes through the lens group of Example 2, Figure 8 This is a schematic diagram of field curvature and distortion of light with wavelengths of 486nm, 588nm and 656nm after passing through the lens group of Example 2 provided in Example 2 of the present application, Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. Figures 6 to 8 The red line in the figure corresponds to a wavelength of 486nm, the green line corresponds to a wavelength of 588nm, and the blue line corresponds to a wavelength of 656nm.

[0153] See also Figures 5 to 8 As shown, the embodiment of the present application provides a lens group 10, which is different from the embodiment 1 in: the design data of the lens group 10 and the aspheric surface data of each lens. Therefore, the part of the lens group 10 not described in detail in the embodiment 2 refers to the embodiment 1 and will not be repeated here.

[0154] Table 4 shows the design data of the lens group 10 of Example 2

[0155]

[0156] Table 5 is the aspheric surface data of each lens in Example 2

[0157]

[0158] Table 6 shows the setting conditions and corresponding specific values ​​of Example 2

[0159]

[0160]

[0161] Obviously, the lens group 10 of Example 2 satisfies the conditional expressions of each setting condition in Example 1.

[0162] In this embodiment, the entrance pupil diameter of the lens group 10 is 0.9928 mm, the full field of view image height is 2.305 mm, and the field of view angle in the diagonal direction is 92.0°, so that the lens group 10 can achieve the purposes of wide angle, ultra-thinness, and large aperture, so as to be suitable for the lens design of high-definition notebooks composed of high-pixel CMOS and other imaging elements, and its on-axis and off-axis chromatic aberrations are fully corrected to have excellent optical characteristics.

[0163] Embodiment 3:

[0164] Fig. 9 This is a schematic diagram of the exploded structure of the lens assembly provided in Example 3 of the present application, Fig.10This is a schematic diagram of axial chromatic aberration of light with wavelengths of 486 nm, 588 nm and 656 nm after passing through the lens group of Example 3 provided in Example 3 of the present application, Fig.11 This is a schematic diagram of magnification chromatic aberration after light with wavelengths of 486nm, 588nm and 656nm passes through the lens group of Example 3 provided in Example 3 of the present application, Fig.12 This is a schematic diagram of field curvature and distortion of light with wavelengths of 486nm, 588nm and 656nm after passing through the lens group of Example 3 provided in Example 3 of the present application, Fig.12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. Figures 10 to 12 The blue line in the figure corresponds to a wavelength of 486nm, the green line corresponds to a wavelength of 588nm, and the red line corresponds to a wavelength of 656nm.

[0165] See also Figures 9 to 12 As shown, the embodiment of the present application provides a lens group 10, which is different from the embodiment 1 in: the design data of the lens group 10 and the aspheric surface data of each lens. Therefore, the part of the lens group 10 not described in detail in the embodiment 3 refers to the embodiment 1 and will not be repeated here.

[0166] Table 7 shows the design data of the lens group 10 of Example 3

[0167]

[0168] Table 8 is the aspheric surface data of each lens in Example 3

[0169]

[0170] Table 9 shows the setting conditions and corresponding specific values ​​of Example 3

[0171]

[0172]

[0173] Obviously, the lens group 10 of Example 3 satisfies the conditional expressions of the setting conditions in Example 1.

[0174] In this embodiment, the entrance pupil diameter of the lens group 10 is 1.035 mm, the full field of view image height is 2.305 mm, and the field of view angle in the diagonal direction is 89.2°, so that the lens group 10 can achieve the purposes of wide angle, ultra-thinness, and large aperture, so as to be suitable for the lens design of high-definition notebooks composed of high-pixel CMOS and other imaging elements, and its on-axis and off-axis chromatic aberrations are fully corrected to have excellent optical characteristics.

[0175] Embodiment 4:

[0176] Fig.13This is a schematic diagram of the exploded structure of the lens assembly provided in Example 4 of the present application, Fig.14 This is a schematic diagram of axial chromatic aberration of light with wavelengths of 486 nm, 588 nm and 656 nm after passing through the lens group of Example 4 provided in Example 4 of the present application, Fig.15 This is a schematic diagram of magnification chromatic aberration after light with wavelengths of 486nm, 588nm and 656nm passes through the lens group of Example 4 provided in Example 4 of the present application, Fig.16 This is a schematic diagram of field curvature and distortion of light with wavelengths of 486nm, 588nm and 656nm after passing through the lens group of Example 4 provided in Example 4 of the present application, Fig.16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. Figures 14 to 16 The red line in the figure corresponds to a wavelength of 486nm, the green line corresponds to a wavelength of 588nm, and the blue line corresponds to a wavelength of 656nm.

[0177] See also Figures 13 to 16 As shown, the embodiment of the present application provides a lens group 10, which is different from the embodiment 1 in: the design data of the lens group 10 and the aspheric surface data of each lens. Therefore, the part of the lens group 10 not described in detail in the embodiment 4 refers to the embodiment 1 and will not be repeated here.

[0178] Table 10 shows the design data of the lens group 10 of Example 4

[0179]

[0180] Table 11 is the aspheric surface data of each lens in Example 4

[0181]

[0182] Table 12 shows the setting conditions and corresponding specific values ​​of Example 4

[0183]

[0184]

[0185] Obviously, the lens group 10 of Example 4 satisfies the conditional expressions of the setting conditions in Example 1.

[0186] In this embodiment, the entrance pupil diameter of the lens group 10 is 0.9678 mm, the full field of view image height is 2.305 mm, and the diagonal field of view angle is 92.6°, so that the lens group 10 can achieve the purposes of wide angle, ultra-thinness, and large aperture, so as to be suitable for the lens design of high-definition notebooks composed of high-pixel CMOS and other imaging elements, and its on-axis and off-axis chromatic aberrations are fully corrected to have excellent optical characteristics.

[0187] Second aspect

[0188] The embodiment of the present application provides an electronic device, which includes: any one of the above-mentioned lens sets 10. The electronic device can be a notebook computer, a tablet computer, a mobile phone, or other electronic devices.

[0189] It should be noted that the lens group in the electronic device provided in the embodiment of the present application is similar to the description of the lens group embodiment in the above-mentioned embodiment, and has similar beneficial effects as the lens group embodiment in the above-mentioned embodiment. For technical details not disclosed in the embodiment of the electronic device of the present application, please refer to the description of the lens group embodiment in the present application for understanding, and no further description will be given here.

[0190] So far, various embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed herein.

[0191] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A lens assembly, characterized in that: include: A first lens having positive refractive power, a focal length of f1, and 2.74≤f1≤2.86; A second lens having negative refractive power, a focal length of f2, and -14.9≤f2≤-6.1; a third lens element having positive refractive power, a focal length of f3, and 1.30≤f3≤2.91; a fourth lens element having negative refractive power, a focal length of f4, and -4.6≤f4≤-1.4; Wherein, the first lens, the second lens, the third lens and the fourth lens are arranged in sequence from the object side to the image side of the optical path.

2. The lens assembly according to claim 1, characterized in that: The focal length of the lens group is f, and satisfies the following relationship: 1.20≤f1 / f≤1.33; -6.68≤f2 / f≤-2.88; 0.60≤f3 / f≤1.30; -2.15≤f4 / f≤-0.

66.

3. The lens assembly according to claim 1 or 2, characterized in that: The total optical length of the lens group is TTL, and TTL≤2.9mm.

4. The lens assembly according to claim 3, characterized in that: The on-axis thickness of the first lens is d1, the on-axis thickness of the second lens is d3, the on-axis thickness of the third lens is d5, and the on-axis thickness of the fourth lens is d7; and, 0.10≤d1 / TTL≤0.16; 0.04≤d3 / TTL≤0.07; 0.14≤d5 / TTL≤0.29; 0.08≤d7 / TTL≤0.

17.

5. The lens assembly according to claim 3, characterized in that: The imaging height of the lens group is IH, and TTL / IH≤1.

26.

6. The lens assembly according to claim 1, characterized in that: Also includes at least one of the following: The curvature radii of the first lens on the object side and the image side are R1 and R2 respectively, and satisfy -2.05≤(R1+R2) / (R1-R2)≤-1.63; The curvature radii of the second lens on the object side and the image side are R3 and R4 respectively, and satisfy -1.80≤(R3+R4) / (R3-R4)≤0.37; The curvature radii of the third lens on the object side and the image side are R5 and R6 respectively, and satisfy 1.53≤(R5+R6) / (R5-R6)≤3.15; The curvature radii of the fourth lens on the object side and the image side are R7 and R8 respectively, and satisfy 1.47≤(R7+R8) / (R7-R8)≤3.

76.

7. The lens assembly according to claim 1, characterized in that: The refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, and the refractive index of the fourth lens is n4; and, 1.50≤n1≤1.55； 1.60≤n2≤1.67； 1.50≤n3≤1.55； 1.50≤n4≤1.55。 8. The lens assembly according to claim 1, characterized in that: An Abbe number of any one of the first lens, the third lens, and the fourth lens is greater than an Abbe number of the second lens, and a difference between the Abbe number of any one of the first lens, the third lens, and the fourth lens and the Abbe number of the second lens is greater than 30.

9. The lens assembly according to claim 1, characterized in that: The field of view of the lens group is FOV, and FOV ≥ 89°; or, An aperture is arranged on a side of the first lens away from the second lens, and an aperture number of the aperture is F, and F≤2.

20.

10. An electronic device, characterized in that: include: The lens assembly according to any one of claims 1 to 9.

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