Wide-angle optical imaging system and electronic device

Abstract

The application discloses a wide-angle optical imaging system and electronic equipment, and relates to the technical field of optical imaging systems, and specifically discloses a wide-angle optical imaging system which is composed of a first lens to a sixth lens; the first, third and sixth lenses have negative refractive power, and the remaining lenses have positive refractive power; the object side surface and the image side surface of the first lens are both concave, the object side surface and the image side surface of the second lens and the fifth lens are both convex; the object side surface and the image side surface of the third lens are both convex; the object side surface of the fourth lens and the sixth lens is convex, and the image side surface is concave; the optical imaging system satisfies the following conditions: 1.4 < EPD / SAG12 < 1.8; 3.55 < T26 / CT1 < 4.55. Through reasonable matching of the refractive power and surface type of the first lens to the sixth lens, a large wide-angle shooting effect can be obtained, and meanwhile, better imaging quality is achieved, so that the requirement of small and miniaturized electronic equipment can be met, and the influence on the accuracy and efficiency of fingerprint identification is reduced while the size of the under-screen fingerprint lens is reduced.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more particularly to a wide-angle optical imaging system and electronic device. Background Technology

[0002] With the widespread use of portable electronic devices, the functions of electronic devices are gradually becoming more diversified, and fingerprint unlocking is a widely used permission verification method in various electronic devices.

[0003] To make electronic devices more portable, they are now trending towards thinner and lighter designs. This places higher demands on the various functional components within these devices. To accommodate the smaller size of electronic devices, the size of the under-display fingerprint camera needs to be further reduced. However, this reduction in size will shrink the shooting range of the under-display fingerprint camera, potentially affecting the accuracy and efficiency of fingerprint recognition and impacting the user experience. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a wide-angle optical imaging system and electronic device, solving the problem that the reduction in the size of the under-display fingerprint lens, in order to adapt to the miniaturization of electronic devices, affects the accuracy and efficiency of fingerprint recognition.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A wide-angle optical imaging system comprises a first lens to a sixth lens arranged sequentially from the object side to the image side;

[0007] The first lens has negative refractive power, and its object-side surface and image-side surface are both concave near the optical axis. The first lens is a glass lens, and at least one of the object-side surface and image-side surface of the first lens is spherical.

[0008] The second lens has positive refractive power, and both its object-side and image-side surfaces are convex near the optical axis;

[0009] The third lens has positive refractive power, its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis;

[0010] The fourth lens has negative refractive power, and its object-side surface is convex near the optical axis, while its image-side surface is concave near the optical axis.

[0011] The fifth lens has positive refractive power, and its object-side surface and image-side surface are both convex near the optical axis.

[0012] The sixth lens has negative refractive power, and its object-side surface is convex near the optical axis, while its image-side surface is concave near the optical axis.

[0013] The optical imaging system further includes an aperture, which is disposed between the second lens and the third lens;

[0014] The optical imaging system satisfies the following conditions:

[0015] 1.4 < EPD / SAG12 < 1.8;

[0016] 3.55 < T26 / CT1 < 4.55;

[0017] Wherein, EPD is the entrance pupil diameter of the wide-angle optical imaging system, SAG12 is the horizontal displacement of the point where the image-side surface of the first lens intersects the optical axis to the maximum effective radius of the image-side surface of the first lens on the optical axis, T26 is the center distance between the second lens and the sixth lens on the optical axis, and CT1 is the thickness of the central optical axis of the first lens.

[0018] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0019] 0.7 < R²¹ / f² < 1.05;

[0020] Wherein, R21 is the radius of curvature of the object-side surface of the second lens, and f2 is the focal length of the second lens.

[0021] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0022] 3.45 < DM21 / CT2 < 4.1;

[0023] Wherein, DM21 is the maximum effective diameter of the object-side surface of the second lens, and CT2 is the thickness of the central optical axis of the second lens.

[0024] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0025] 3.45 < R31 / R32 < 4.1;

[0026] Wherein, R31 is the radius of curvature of the object-side surface of the third lens, and R32 is the radius of curvature of the image-side surface of the third lens.

[0027] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0028] 8.0 < (R41 + R42) / CT4 < 9.0;

[0029] Wherein, R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, and CT4 is the thickness of the central optical axis of the fourth lens.

[0030] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0031] 2.3 < f5 / CT5 < 2.7;

[0032] Where f5 is the focal length of the fifth lens, and CT5 is the thickness of the central optical axis of the fifth lens.

[0033] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0034] -3.6 < R51 / R52 < -3.0;

[0035] Wherein, R51 is the radius of curvature of the object-side surface of the fifth lens, and R52 is the radius of curvature of the image-side surface of the fifth lens.

[0036] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0037] 7.15<(R61+R62) / CT6<8.45;

[0038] Wherein, R61 is the radius of curvature of the object-side surface of the sixth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, and CT6 is the thickness of the central optical axis of the sixth lens.

[0039] Optionally, the wide-angle optical imaging system also satisfies the following condition:

[0040] 2.3 < Tan (HFOV);

[0041] Wherein, HFOV is the half field of view of the wide-angle optical imaging system.

[0042] The present invention also provides an electronic device, including a wide-angle optical imaging system as described in any of the preceding claims, and an imaging element for converting an optical pattern formed by the wide-angle optical imaging system into an electrical signal.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] This invention provides a wide-angle optical imaging system and electronic device. By rationally matching the refractive power and surface shape of the first to sixth lenses, a wide-angle shooting effect can be obtained, while also possessing better imaging quality. This adapts to the current requirements for miniaturization of electronic devices, reducing the impact on the accuracy and efficiency of fingerprint recognition while shrinking the size of the under-display fingerprint lens. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0046] Figure 1 A schematic diagram of a wide-angle optical imaging system according to Embodiment 1 of the present invention is shown;

[0047] Figure 2 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 1 of the present invention.

[0048] Figure 3 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 1 of the present invention;

[0049] Figure 4 A schematic diagram of a wide-angle optical imaging system according to Embodiment 2 of the present invention is shown;

[0050] Figure 5 From left to right, these are astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 2 of the present invention;

[0051] Figure 6 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 2 of the present invention;

[0052] Figure 7 A schematic diagram of a wide-angle optical imaging system according to Embodiment 3 of the present invention is shown;

[0053] Figure 8 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 3 of the present invention.

[0054] Figure 9 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 3 of the present invention;

[0055] Figure 10 A schematic diagram of a wide-angle optical imaging system according to Embodiment 4 of the present invention is shown;

[0056] Figure 11 From left to right, these are astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 4 of the present invention;

[0057] Figure 12 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 4 of the present invention;

[0058] Figure 13A schematic diagram of a wide-angle optical imaging system according to Embodiment 5 of the present invention is shown;

[0059] Figure 14 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 5 of the present invention.

[0060] Figure 15 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 5 of the present invention;

[0061] Figure 16 A schematic diagram of a wide-angle optical imaging system according to Embodiment Six of the present invention is shown;

[0062] Figure 17 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 6 of the present invention.

[0063] Figure 18 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment Six of the present invention.

[0064] In the above diagram: E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; E6, sixth lens; E7, filter; STO, aperture;

[0065] S1, object-side surface of the first lens; S2, image-side surface of the first lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; S13, imaging plane. Detailed Implementation

[0066] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0067] It should be understood that in the description of this invention, specific embodiments are merely used to explain the invention and not to limit it. The exemplary embodiments are described as processes or methods depicted as flowcharts; although the flowcharts describe the operations or steps in a certain order, many of these operations or steps can be performed in parallel, concurrently, or simultaneously, and the order of the operations can be rearranged. When an operation or step is completed, the corresponding process can be terminated, and additional steps not included in the drawings may also be included. The processes described above can correspond to methods, functions, procedures, subroutines, subroutines, etc., and the embodiments and features in the embodiments of this invention can be combined with each other without conflict.

[0068] The term "comprising" and its variations used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The technical solutions of this invention will be further described below with reference to the accompanying drawings and specific embodiments; it should be understood that, for ease of description, only the parts related to this invention are shown in the drawings, not the entire structure.

[0069] The present invention provides a wide-angle optical imaging system, which consists of a first lens to a sixth lens arranged sequentially from the object side to the image side, and includes an aperture disposed between the second lens and the third lens.

[0070] Specifically, the first lens has negative refractive power, and its object-side surface and image-side surface are both concave near the optical axis. The first lens is a glass lens, and at least one of the object-side surface and image-side surface of the first lens is spherical.

[0071] The second lens has positive refractive power, and its object-side surface and image-side surface are both convex near the optical axis.

[0072] The third lens has positive refractive power, its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis;

[0073] The fourth lens has negative refractive power, and its object-side surface is convex near the optical axis, while its image-side surface is concave near the optical axis.

[0074] The fifth lens has positive refractive power, and both its object-side and image-side surfaces are convex near the optical axis.

[0075] The sixth lens has negative refractive power. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis.

[0076] In this invention, the optical imaging system satisfies the following conditions:

[0077] 1.4 < EPD / SAG12 < 1.8;

[0078] 3.55 < T26 / CT1 < 4.55;

[0079] Wherein, EPD is the entrance pupil diameter of the wide-angle optical imaging system, SAG12 is the horizontal displacement of the point where the image-side surface of the first lens intersects the optical axis to the maximum effective radius of the image-side surface of the first lens on the optical axis, T26 is the center distance between the second lens and the sixth lens on the optical axis, and CT1 is the thickness of the central optical axis of the first lens.

[0080] By satisfying 1.4 < EPD / SAG12 < 1.8, the entrance pupil diameter of the wide-angle optical imaging system can be adjusted, which is beneficial for achieving the purpose of a wide-angle optical system. In addition, by satisfying 3.55 < T26 / CT1 < 4.55, the thickness of the first lens and the spacing between the second to sixth lenses can be adjusted, thereby reducing the sensitivity of the wide-angle optical imaging system and improving its manufacturability.

[0081] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0082] 0.7 < R²¹ / f² < 1.05;

[0083] Where R21 is the radius of curvature of the object-side surface of the second lens, and f2 is the focal length of the second lens. By satisfying the aforementioned conditions, the surface shape and focal length of the second lens can be reasonably adjusted, which is beneficial for reasonably adjusting the field curvature balance of the wide-angle optical imaging system, thereby improving the imaging quality.

[0084] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0085] 3.45 < DM21 / CT2 < 4.1;

[0086] Wherein, DM21 is the maximum effective diameter of the object-side surface of the second lens, and CT2 is the thickness of the central optical axis of the second lens. By using this relationship to limit the effective diameter and thickness of the object-side surface of the second lens, it is beneficial to maintain good imaging performance while shortening the overall optical length, thereby meeting the miniaturization requirements of the optical system.

[0087] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0088] 3.45 < R31 / R32 < 4.1;

[0089] Where R31 is the radius of curvature of the object-side surface of the third lens, and R32 is the radius of curvature of the image-side surface of the third lens. Within the range defined by this relationship, the degree of refraction of light when passing through the third lens can be reduced, thereby achieving high-definition imaging.

[0090] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0091] 8.0 < (R41 + R42) / CT4 < 9.0;

[0092] Where R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, and CT4 is the thickness of the central optical axis of the fourth lens. Using this relationship to reasonably limit the shape and thickness of the fourth lens helps reduce the assembly difficulty of the fourth lens and keeps its light-gathering ability within a reasonable range, thereby reducing the design sensitivity of the wide-angle optical imaging system.

[0093] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0094] 2.3 < f5 / CT5 < 2.7;

[0095] Where f5 is the focal length of the fifth lens, and CT5 is the thickness of the central optical axis of the fifth lens. By controlling the ratio of the focal length to the thickness of the fifth lens within a reasonable range, the wide-angle optical imaging system is ensured to have good manufacturability.

[0096] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0097] -3.6 < R51 / R52 < -3.0;

[0098] Wherein, R51 is the radius of curvature of the object-side surface of the fifth lens, and R52 is the radius of curvature of the image-side surface of the fifth lens, thereby reducing the degree of deflection of light rays after passing through the fifth lens, thus reducing aberrations.

[0099] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0100] 7.15<(R61+R62) / CT6<8.45;

[0101] Where R61 is the radius of curvature of the object-side surface of the sixth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, and CT6 is the thickness of the central optical axis of the sixth lens. Using this relationship to reasonably limit the shape and thickness of the sixth lens helps reduce the assembly difficulty of the sixth lens and keeps its light-gathering ability within a reasonable range, thereby reducing the design sensitivity of the wide-angle optical imaging system.

[0102] Furthermore, the wide-angle optical imaging system also meets the following conditions:

[0103] 2.3 < Tan(HFOV);

[0104] Here, HFOV is the half field of view of the wide-angle optical imaging system. When this relationship is satisfied, the object-side field of view of the wide-angle optical imaging system can be increased, which is beneficial for expanding the shooting range.

[0105] Example 1

[0106] Please see Figures 1 to 3 , Figure 1 A schematic diagram of a wide-angle optical imaging system according to Embodiment 1 of the present invention is shown. Figure 2 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 1 of the present invention. Figure 3 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 1 of the present invention.

[0107] The present invention provides a wide-angle optical imaging system, which consists of a first lens E1 to a sixth lens E6 arranged sequentially from the object side to the image side, and further includes an aperture STO, which is disposed between the second lens E2 and the third lens E3.

[0108] Specifically, the first lens E1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave near the optical axis. The first lens E1 is a glass lens, and at least one of the object-side surface S1 and the image-side surface S2 of the first lens E1 is a spherical surface.

[0109] The second lens E2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis.

[0110] The third lens E3 has positive refractive power. Its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is convex near the optical axis.

[0111] The fourth lens E4 has negative refractive power. Its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is concave near the optical axis.

[0112] The fifth lens E5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex near the optical axis;

[0113] The sixth lens E6 has negative refractive power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0114] A filter E7 is positioned between the sixth lens E6 and the imaging surface. Light from the object passes sequentially through the surfaces of the first lens E1 to the sixth lens E6 and the filter E7, ultimately forming an image on the imaging surface S13. This filter E7 is an infrared filter, which filters out infrared light entering the lens, preventing infrared light from illuminating the image sensor and causing noise. Specifically, the infrared filter E7 can be made of glass to avoid affecting the focal length.

[0115] In addition, a cover is provided between the wide-angle optical imaging system and the subject. The cover can be a flat glass plate and can also serve as a touch panel. When reading a fingerprint, the finger is placed on the cover, and the wide-angle optical imaging system performs imaging recognition.

[0116] Please refer to Table 1-1, Table 1-2, and Table 1-3 below.

[0117]

[0118]

[0119]

[0120] Table 1-1 shows the detailed structural data for Example 1, where the units for radius of curvature, thickness, and focal length are millimeters, f is the focal length of the wide-angle optical imaging system, and HFOV is half of the maximum field of view of the wide-angle optical imaging system.

[0121] Table 1-2 shows the aspheric coefficient data in Example 1, where k represents the conical coefficient in the aspheric curve equation, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 represent the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, and 20th order aspheric coefficients of each surface.

[0122] Table 1-3 shows the conditions satisfied by the wide-angle optical imaging system in Example 1.

[0123] In addition, the tables in the following embodiments are schematic diagrams and graphs corresponding to each embodiment. The definitions of the data in the tables are the same as those in Tables 1-1, 1-2 and 1-3 of the first embodiment, and will not be repeated here.

[0124] Example 2

[0125] Please see Figures 4 to 6 , Figure 4 A schematic diagram of a wide-angle optical imaging system according to Embodiment 2 of the present invention is shown. Figure 5 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 2 of the present invention. Figure 6 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 2 of the present invention.

[0126] The present invention provides a wide-angle optical imaging system, which consists of a first lens E1 to a sixth lens E6 arranged sequentially from the object side to the image side, and further includes an aperture STO, which is disposed between the second lens E2 and the third lens E3.

[0127] Specifically, the first lens E1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave near the optical axis. The first lens E1 is a glass lens, and at least one of the object-side surface S1 and the image-side surface S2 of the first lens E1 is a spherical surface.

[0128] The second lens E2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis.

[0129] The third lens E3 has positive refractive power. Its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is convex near the optical axis.

[0130] The fourth lens E4 has negative refractive power. Its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is concave near the optical axis.

[0131] The fifth lens E5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex near the optical axis;

[0132] The sixth lens E6 has negative refractive power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0133] A filter E7 is positioned between the sixth lens E6 and the imaging surface. Light from the object passes sequentially through the surfaces of the first lens E1 to the sixth lens E6 and the filter E7, ultimately forming an image on the imaging surface S13. This filter E7 is an infrared filter, which filters out infrared light entering the lens, preventing infrared light from illuminating the image sensor and causing noise. Specifically, the infrared filter E7 can be made of glass to avoid affecting the focal length.

[0134] In addition, a cover is provided between the wide-angle optical imaging system and the subject. The cover can be a flat glass plate and can also serve as a touch panel. When reading a fingerprint, the finger is placed on the cover, and the wide-angle optical imaging system performs imaging recognition.

[0135] Please refer to Table 2-1, Table 2-2, and Table 2-3 below.

[0136]

[0137]

[0138]

[0139] Example 3

[0140] Please see Figures 7 to 9 , Figure 7 A schematic diagram of a wide-angle optical imaging system according to Embodiment 3 of the present invention is shown. Figure 8 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 3 of the present invention. Figure 9 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 3 of the present invention.

[0141] The present invention provides a wide-angle optical imaging system, which consists of a first lens E1 to a sixth lens E6 arranged sequentially from the object side to the image side, and further includes an aperture STO, which is disposed between the second lens E2 and the third lens E3.

[0142] Specifically, the first lens E1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave near the optical axis. The first lens E1 is a glass lens, and at least one of the object-side surface S1 and the image-side surface S2 of the first lens E1 is a spherical surface.

[0143] The second lens E2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis.

[0144] The third lens E3 has positive refractive power. Its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is convex near the optical axis.

[0145] The fourth lens E4 has negative refractive power. Its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is concave near the optical axis.

[0146] The fifth lens E5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex near the optical axis;

[0147] The sixth lens E6 has negative refractive power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0148] A filter E7 is positioned between the sixth lens E6 and the imaging surface. Light from the object passes sequentially through the surfaces of the first lens E1 to the sixth lens E6 and the filter E7, ultimately forming an image on the imaging surface S13. This filter E7 is an infrared filter, which filters out infrared light entering the lens, preventing infrared light from illuminating the image sensor and causing noise. Specifically, the infrared filter E7 can be made of glass to avoid affecting the focal length.

[0149] In addition, a cover is provided between the wide-angle optical imaging system and the subject. The cover can be a flat glass plate and can also serve as a touch panel. When reading a fingerprint, the finger is placed on the cover, and the wide-angle optical imaging system performs imaging recognition.

[0150] Please refer to Tables 3-1, 3-2, and 3-3 below.

[0151]

[0152]

[0153]

[0154] Example 4

[0155] Please see Figures 10 to 12 , Figure 10 A schematic diagram of a wide-angle optical imaging system according to Embodiment 4 of the present invention is shown. Figure 11 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 4 of the present invention. Figure 12 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 4 of the present invention.

[0156] The present invention provides a wide-angle optical imaging system, which consists of a first lens E1 to a sixth lens E6 arranged sequentially from the object side to the image side, and further includes an aperture STO, which is disposed between the second lens E2 and the third lens E3.

[0157] Specifically, the first lens E1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave near the optical axis. The first lens E1 is a glass lens, and at least one of the object-side surface S1 and the image-side surface S2 of the first lens E1 is a spherical surface.

[0158] The second lens E2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis.

[0159] The third lens E3 has positive refractive power. Its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is convex near the optical axis.

[0160] The fourth lens E4 has negative refractive power. Its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is concave near the optical axis.

[0161] The fifth lens E5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex near the optical axis;

[0162] The sixth lens E6 has negative refractive power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0163] A filter E7 is positioned between the sixth lens E6 and the imaging surface. Light from the object passes sequentially through the surfaces of the first lens E1 to the sixth lens E6 and the filter E7, ultimately forming an image on the imaging surface S13. This filter E7 is an infrared filter, which filters out infrared light entering the lens, preventing infrared light from illuminating the image sensor and causing noise. Specifically, the infrared filter E7 can be made of glass to avoid affecting the focal length.

[0164] In addition, a cover is provided between the wide-angle optical imaging system and the subject. The cover can be a flat glass plate and can also serve as a touch panel. When reading a fingerprint, the finger is placed on the cover, and the wide-angle optical imaging system performs imaging recognition.

[0165] Please refer to Tables 4-1, 4-2, and 4-3 below.

[0166]

[0167]

[0168]

[0169] Example 5

[0170] Please see Figures 13 to 15 , Figure 13 A schematic diagram of a wide-angle optical imaging system according to Embodiment 5 of the present invention is shown. Figure 14 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment 5 of the present invention. Figure 15 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment 5 of the present invention.

[0171] The present invention provides a wide-angle optical imaging system, which consists of a first lens E1 to a sixth lens E6 arranged sequentially from the object side to the image side, and further includes an aperture STO, which is disposed between the second lens E2 and the third lens E3.

[0172] Specifically, the first lens E1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave near the optical axis. The first lens E1 is a glass lens, and at least one of the object-side surface S1 and the image-side surface S2 of the first lens E1 is a spherical surface.

[0173] The second lens E2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis.

[0174] The third lens E3 has positive refractive power. Its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is convex near the optical axis.

[0175] The fourth lens E4 has negative refractive power. Its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is concave near the optical axis.

[0176] The fifth lens E5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex near the optical axis;

[0177] The sixth lens E6 has negative refractive power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0178] A filter E7 is positioned between the sixth lens E6 and the imaging surface. Light from the object passes sequentially through the surfaces of the first lens E1 to the sixth lens E6 and the filter E7, ultimately forming an image on the imaging surface S13. This filter E7 is an infrared filter, which filters out infrared light entering the lens, preventing infrared light from illuminating the image sensor and causing noise. Specifically, the infrared filter E7 can be made of glass to avoid affecting the focal length.

[0179] In addition, a cover is provided between the wide-angle optical imaging system and the subject. The cover can be a flat glass plate and can also serve as a touch panel. When reading a fingerprint, the finger is placed on the cover, and the wide-angle optical imaging system performs imaging recognition.

[0180] Please refer to Tables 5-1, 5-2, and 5-3 below.

[0181]

[0182]

[0183]

[0184] Example 6

[0185] Please see Figures 16 to 18 , Figure 16 A schematic diagram of a wide-angle optical imaging system according to Embodiment Six of the present invention is shown. Figure 17 From left to right, the graphs show the astigmatism and distortion curves of a wide-angle optical imaging system according to Embodiment Six of the present invention. Figure 18 This is a spherical aberration curve of a wide-angle optical imaging system according to Embodiment Six of the present invention.

[0186] The present invention provides a wide-angle optical imaging system, which consists of a first lens E1 to a sixth lens E6 arranged sequentially from the object side to the image side, and further includes an aperture STO, which is disposed between the second lens E2 and the third lens E3.

[0187] Specifically, the first lens E1 has negative refractive power, and its object-side surface S1 and image-side surface S2 are both concave near the optical axis. The first lens E1 is a glass lens, and at least one of the object-side surface S1 and the image-side surface S2 of the first lens E1 is a spherical surface.

[0188] The second lens E2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis.

[0189] The third lens E3 has positive refractive power. Its object-side surface S5 is concave near the optical axis, and its image-side surface S6 is convex near the optical axis.

[0190] The fourth lens E4 has negative refractive power. Its object-side surface S7 is convex near the optical axis, and its image-side surface S8 is concave near the optical axis.

[0191] The fifth lens E5 has positive refractive power, and its object-side surface S9 and image-side surface S10 are both convex near the optical axis;

[0192] The sixth lens E6 has negative refractive power. Its object-side surface S11 is convex near the optical axis, and its image-side surface S12 is concave near the optical axis.

[0193] A filter E7 is positioned between the sixth lens E6 and the imaging surface. Light from the object passes sequentially through the surfaces of the first lens E1 to the sixth lens E6 and the filter E7, ultimately forming an image on the imaging surface S13. This filter E7 is an infrared filter, which filters out infrared light entering the lens, preventing infrared light from illuminating the image sensor and causing noise. Specifically, the infrared filter E7 can be made of glass to avoid affecting the focal length.

[0194] In addition, a cover is provided between the wide-angle optical imaging system and the subject. The cover can be a flat glass plate and can also serve as a touch panel. When reading a fingerprint, the finger is placed on the cover, and the wide-angle optical imaging system performs imaging recognition.

[0195] Please refer to Tables 6-1, 6-2, and 6-3 below.

[0196]

[0197]

[0198]

[0199] Example 7

[0200] This invention provides an electronic device, including a wide-angle optical imaging system as provided in any of the preceding embodiments, and an imaging element for converting an optical pattern formed by the wide-angle optical imaging system into an electrical signal.

[0201] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wide-angle optical imaging system, characterized in that, It consists of a first lens to a sixth lens arranged sequentially from the object side to the image side; The first lens has negative refractive power, and its object-side surface and image-side surface are both concave near the optical axis. The first lens is a glass lens, and at least one of the object-side surface and image-side surface of the first lens is spherical. The second lens has positive refractive power, and both its object-side and image-side surfaces are convex near the optical axis; The third lens has negative refractive power, its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis; The fourth lens has positive refractive power, and its object-side surface is convex near the optical axis, while its image-side surface is concave near the optical axis. The fifth lens has positive refractive power, and its object-side surface and image-side surface are both convex near the optical axis. The sixth lens has negative refractive power, and its object-side surface is convex near the optical axis, while its image-side surface is concave near the optical axis. The optical imaging system further includes an aperture, which is disposed between the second lens and the third lens; The optical imaging system satisfies the following conditions: ； ； Wherein, EPD is the entrance pupil diameter of the wide-angle optical imaging system, SAG12 is the horizontal displacement of the point where the image-side surface of the first lens intersects the optical axis to the maximum effective radius of the image-side surface of the first lens on the optical axis, T26 is the center distance between the second lens and the sixth lens on the optical axis, and CT1 is the thickness of the central optical axis of the first lens.

2. The wide-angle optical imaging system according to claim 1, characterized in that, It also meets the following conditions: ； Wherein, R21 is the radius of curvature of the object-side surface of the second lens, and f2 is the focal length of the second lens.

3. The wide-angle optical imaging system according to claim 1, characterized in that, It also meets the following conditions: ； Wherein, DM21 is the maximum effective diameter of the object-side surface of the second lens, and CT2 is the thickness of the central optical axis of the second lens.

4. The wide-angle optical imaging system according to claim 1, characterized in that, It also meets the following conditions: ； Wherein, R31 is the radius of curvature of the object-side surface of the third lens, and R32 is the radius of curvature of the image-side surface of the third lens.

5. The wide-angle optical imaging system according to claim 1, characterized in that, It also meets the following conditions: ； Wherein, R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens, and CT4 is the thickness of the central optical axis of the fourth lens.

6. The wide-angle optical imaging system according to claim 1, characterized in that, It also meets the following conditions: ； ； Where f5 is the focal length of the fifth lens, CT5 is the thickness of the central optical axis of the fifth lens, R51 is the radius of curvature of the object-side surface of the fifth lens, and R52 is the radius of curvature of the image-side surface of the fifth lens.

7. The wide-angle optical imaging system according to claim 1, characterized in that, It also meets the following conditions: ； Wherein, R61 is the radius of curvature of the object-side surface of the sixth lens, R62 is the radius of curvature of the image-side surface of the sixth lens, and CT6 is the thickness of the central optical axis of the sixth lens.

8. The wide-angle optical imaging system according to claim 1, characterized in that, It also meets the following conditions: ； Wherein, HFOV is the half field of view of the wide-angle optical imaging system.

9. An electronic device, characterized in that, It includes a wide-angle optical imaging system as described in any one of claims 1 to 8, and an imaging element for converting an optical pattern formed by the wide-angle optical imaging system into an electrical signal.

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