High-pixel, ultra-thin, large-angle optical system and head-mounted device

Abstract

The application discloses a high-pixel, ultra-thin, large-angle optical system and a head-mounted device, which are mainly composed of six lenses, the number of lenses is reasonable, and the structure is simple. By reasonably distributing the ratio range of the maximum field angle of the optical imaging system and the axial distance from the object side of the first lens E1 to the imaging surface, the optical system further has a wide-angle characteristic while maintaining a small size, the imaging quality of the optical system is improved, the optical system has the advantages of high pixels and a large angle, meanwhile, the configuration of a large aperture can increase the light quantity of the optical system and the imaging quality, so that the head-mounted optical system has greater competitiveness in the head-mounted device market.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a high-pixel, ultra-thin, large-angle optical system used in a head-mounted optical system and a head-mounted device using the same. BACKGROUND

[0002] In recent years, augmented reality (AR) technology and virtual reality (VR) technology have been applied in, for example, head-mounted devices and have rapidly developed. The core component of augmented reality technology and virtual reality technology is an optical system. The display effect of the optical system will directly determine the quality of the head-mounted device. In conventional head-mounted devices, in addition to the optical systems of the eyes, facial expressions, and hands, there is also an optical system for head tracking function, which can be used to track the head movement of a user, and then move the displayed image according to the recorded data so that it can match the position of the head movement. The head tracking optical system currently used has a low pixel and a small field of view angle range. It is extremely important to increase the field of view angle of the optical system while achieving a high pixel, which can make the product have greater competitiveness in the market. SUMMARY

[0003] To overcome the problem of low pixel and small field of view angle range of the optical system currently used in head-mounted devices, the present application provides a high-pixel, ultra-thin, large-angle optical system, which has the advantages of high pixel and large angle, and can increase the light amount and the imaging quality of the optical system.

[0004] A high-pixel, ultra-thin, large-angle optical system, which is composed of a first lens, a second lens, a diaphragm, a third lens, a fourth lens, a fifth lens, and a sixth lens along the optical axis from the object plane to the image plane.

[0005] The object side of the first lens is convex, and the image side is concave, and the optical power is negative.

[0006] The object side of the second lens is concave, and the image side is convex, and the optical power is positive.

[0007] The object side of the third lens is convex.

[0008] The object side of the fifth lens is convex, and the optical power is positive.

[0009] The object side of the sixth lens is concave, and the optical power is negative.

[0010] The optical system satisfies the following conditions:

[0011] f / EPD<2.0;

[0012] 16 deg / mm < FOV / TTL < 19 deg / mm;

[0013] wherein f is an effective focal length of the optical system, EPD is an entrance pupil diameter of the optical system, FOV is a maximum field angle of the optical system, and TTL is an on-axis distance from a first lens object side to an image plane of the optical system.

[0014] The high-pixel, ultra-thin, large-angle optical system as described above satisfies the following conditions:

[0015] -5.1 < (f5-f6) / (f5+f6) < -3.5;

[0016] -5.0 < f1*f5 / f < -2.7;

[0017] wherein f1 is an effective focal length of the first lens, f5 is an effective focal length of the fifth lens, f6 is an effective focal length of the sixth lens, and f is an effective focal length of the optical system.

[0018] The high-pixel, ultra-thin, large-angle optical system as described above satisfies the following conditions:

[0019] -11 < 2*(R1+R2) / (R2+R3) < -7.7;

[0020] 0.9 < (R11+R12) / (R11-R12) < 1.8;

[0021] wherein R1 is a curvature radius of the first lens object side, R2 is a curvature radius of the first lens image side, R3 is a curvature radius of the second lens object side, R11 is a curvature radius of the sixth lens object side, and R12 is a curvature radius of the sixth lens image side.

[0022] The high-pixel, ultra-thin, large-angle optical system as described above satisfies the following conditions:

[0023] -2.8 < f5 / R3 < -1.5;

[0024] -4.5 < 2*f6 / R12 < -2.9;

[0025] wherein R3 is a curvature radius of the second lens object side, R12 is a curvature radius of the sixth lens image side, f5 is an effective focal length of the fifth lens, and f6 is an effective focal length of the sixth lens.

[0026] The high-pixel, ultra-thin, large-angle optical system as described above satisfies the following conditions:

[0027] The high-pixel, ultra-thin, large-angle optical system as described above satisfies the following conditions:

[0028] 3.5 < DT11 / SAG1 < 4.4;

[0029] 8 < 5*(SAG1-SAG3) / (SAG1+SAG3) < 11;

[0030] 1.7 < (CT1+CT6) / (SAG1+SAG11) < 3.2;

[0031] wherein, DT11 is the maximum effective radius of the first lens object side, SAG1 is the distance from the maximum effective aperture of the first lens object side to the intersection of the first lens object side and the optical axis in the direction parallel to the optical axis, SAG3 is the distance from the maximum effective aperture of the second lens object side to the intersection of the second lens object side and the optical axis in the direction parallel to the optical axis, SAG11 is the distance from the maximum effective aperture of the sixth lens object side to the intersection of the sixth lens object side and the optical axis in the direction parallel to the optical axis, CT1 is the center thickness of the first lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis.

[0032] The high-pixel, ultra-thin, large-angle optical system as described above, the first lens is a spherical lens, and the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspherical lenses.

[0033] The high-pixel, ultra-thin, large-angle optical system as described above, the maximum effective radius DT11 of the first lens object side is less than or equal to 4.2 mm; and / or

[0034] The F number of the optical system is 2.0.

[0035] The high-pixel, ultra-thin, large-angle optical system as described above, the full field of view FOV and the total optical length TTL of the optical system satisfy: 160° ≤ FOV ≤ 180°, and TTL ≤ 9.6 mm.

[0036] In another aspect, the embodiments of the present application also provide a head-mounted device.

[0037] A head-mounted device at least comprises an optical lens, and the optical lens is internally mounted with the high-pixel, ultra-thin, large-angle optical system as described above.

[0038] Compared with the prior art, the beneficial effects of the present application are as follows:

[0039] The optical system and head-mounted device of the embodiment of the application mainly comprise six lenses, the number of lenses is reasonable, the structure is simple, the ratio range of the maximum field angle of the optical imaging system and the axial distance from the object side of the first lens E1 to the imaging surface is reasonably distributed, so that the optical system further has a wide-angle characteristic while maintaining a small size, the imaging quality of the optical system is improved, and the optical system has the advantages of high pixels and a large wide angle. Meanwhile, the configuration of a large aperture can increase the light quantity of the optical system and the imaging quality, so that the head-mounted optical system has greater competitiveness in the head-mounted device market. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced.

[0041] Figure 1 is a structural schematic diagram of the optical system or head-mounted device of the embodiment 1 of the present application;

[0042] Figure 2 is an axial chromatic aberration, astigmatism and distortion curve diagram of the optical system or head-mounted device of the embodiment 1 of the present application;

[0043] Figure 3 is a structural schematic diagram of the optical system or head-mounted device of the embodiment 2 of the present application;

[0044] Figure 4 is an axial chromatic aberration, astigmatism and distortion curve diagram of the optical system or head-mounted device of the embodiment 2 of the present application;

[0045] Figure 5 is a structural schematic diagram of the optical system or head-mounted device of the embodiment 3 of the present application;

[0046] Figure 6 is an axial chromatic aberration, astigmatism and distortion curve diagram of the optical system or head-mounted device of the embodiment 3 of the present application;

[0047] Figure 7 is a structural schematic diagram of the optical system or head-mounted device of the embodiment 4 of the present application;

[0048] Figure 8 is an axial chromatic aberration, astigmatism and distortion curve diagram of the optical system or head-mounted device of the embodiment 4 of the present application;

[0049] Figure 9 is a structural schematic diagram of the optical system or head-mounted device of the embodiment 5 of the present application;

[0050] Figure 10 is an axial chromatic aberration, astigmatism and distortion curve diagram of the optical system or head-mounted device of the embodiment 5 of the present application. DETAILED DESCRIPTION

[0051] As shown in Figures 1-10 The present application provides a high-pixel, ultra-thin, large-angle optical system, which is sequentially composed of a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and an infrared filter E7 along an optical axis from an object plane to an image plane.

[0052] The object side of the first lens E1 is convex, the image side is concave, and the focal power is negative;

[0053] The object side of the second lens E2 is concave, the image side is convex, and the focal power is positive;

[0054] The object side of the third lens E3 is convex;

[0055] The object side of the fifth lens E5 is convex, and the focal power is positive;

[0056] The object side of the sixth lens E6 is concave, and the focal power is negative.

[0057] The optical system of the embodiment of the present application is mainly composed of six lenses, the number of lenses is reasonable, the structure is simple, has the advantages of high pixel and large angle, and at the same time, the configuration of large aperture can increase the light quantity of the optical system and the imaging quality, so that the head-mounted optical system has greater competitiveness in the head-mounted device market.

[0058] Further, as a preferred embodiment of the present application but not limited, the effective focal length f and the entrance pupil diameter EPD of the optical system satisfy: f / EPD<2.0, by limiting the ratio of the effective focal length and the entrance pupil diameter of the optical imaging system, the optical imaging system has the characteristics of large aperture;

[0059] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies: 16deg / mm<FOV / TTL<19deg / mm, wherein FOV is the maximum field of view angle of the optical system, and TTL is the axial distance from the object side of the first lens E1 to the imaging surface of the optical system, by reasonably allocating the ratio range of the maximum field of view angle and the axial distance from the object side of the first lens E1 to the imaging surface of the optical system, the optical system further has the wide-angle characteristic in the case of keeping small size, breaks through the large size limitation of the traditional ultra-wide view system, so that the small size optical system can also obtain the ultra-wide shooting view angle, in addition, it can also prevent the ratio of the field of view angle and the optical total length from being too large to cause the deflection of the incident light in the optical system to be too strong, thereby being beneficial to suppressing the field curvature, astigmatism, distortion and other aberrations of the edge field of view.

[0060] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: -5.1<(f5-f6) / (f5+f6)<-3.5, wherein f1 is the effective focal length of the first lens E1, f5 is the effective focal length of the fifth lens E5, and f6 is the effective focal length of the sixth lens E6. By limiting the effective focal lengths of the fifth lens E5 and the sixth lens E6 within a reasonable range, the contributions of the spherical aberration and the coma of the third lens E3 and the fourth lens E4 can be effectively constrained, and the sensitivity is balanced to a reasonable level.

[0061] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: -5.0<f1*f5 / f<-2.7, wherein f1 is the effective focal length of the first lens E1, f5 is the effective focal length of the fifth lens E5, and f is the effective focal length of the optical system. By reasonably controlling the ratio of the effective focal lengths of the first lens E1, the fifth lens E5, and the optical system, the optical system can satisfy a large field of view while obtaining a high imaging resolution. If the ratio exceeds the upper limit of the relationship, the refractive power of the first lens E1 and the fifth lens E5 is insufficient, and it is difficult for the light rays at a large angle to be incident to the optical system, which is not conducive to expanding the field of view of the optical system. If the ratio is lower than the lower limit of the relationship, the refractive power of the first lens E1 and the second lens E2 is too strong, which is prone to produce strong astigmatism and chromatic aberration, and is not conducive to high-resolution imaging characteristics.

[0062] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: -11<2*(R1+R2) / (R2+R3)<-7.7, wherein R1 is the curvature radius of the object side surface of the first lens E1, R2 is the curvature radius of the image side surface of the first lens E1, and R3 is the curvature radius of the object side surface of the second lens E2. By controlling the curvature radii of the object side surface and the image side surface of the first lens E1 and the curvature radius of the object side surface of the second lens E2 within a reasonable range, the optical system can have a small light deflection angle and be easy to process.

[0063] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: 0.9<(R11+R12) / (R11-R12)<1.8, wherein R11 is the curvature radius of the object side surface of the sixth lens E6, and R12 is the curvature radius of the image side surface of the sixth lens E6. By controlling the curvature radii of the object side surface and the image side surface of the sixth lens E6, the incident angle of the chief ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled, and the requirement of the incident angle of the chief ray of the optical system design is met.

[0064] Further, as a preferred embodiment of the present application but not limited, the effective focal length f5 of the fifth lens E5 and the curvature radius R3 of the object side surface of the second lens E2 satisfy: -2.8 < f5 / R3 < -1.5, by controlling the ratio of the curvature radius of the object side surface of the second lens E2 and the effective focal length of the fifth lens E5, the bending degree of the second lens E2 and the fifth lens E5 can be reasonably controlled, which has better processing forming characteristics, and meanwhile avoids excessive deflection of light when transmitting between lenses, and reduces the processing difficulty of the optical lens group.

[0065] Further, as a preferred embodiment of the present application but not limited, the effective focal length f6 of the sixth lens E6 and the curvature radius R12 of the image side surface of the sixth lens E6 satisfy: -4.5 < 2*f6 / R12 < -2.9, by limiting the effective focal length of the sixth lens E6 and the curvature radius of the image side surface within a suitable range, the astigmatism of the system can be effectively corrected, and the image quality of the edge field is ensured.

[0066] Further, as a preferred embodiment of the present application but not limited, the effective combined focal length f45 of the fourth lens E4 and the fifth lens E5 and the effective focal length f of the optical system satisfy: 1.3 < f45 / f < 3.2, by controlling the ratio of the effective combined focal length of the fourth lens E4 and the fifth lens E5 and the effective focal length of the optical system, on the one hand, it is beneficial to control the incident light height of the light bundle entering the optical system, so as to reduce the high-order aberration of the optical system and the size of the lens; on the other hand, it can correct the influence of the field curvature of the front lens group on the resolving power.

[0067] Further, as a preferred embodiment of the present application but not limited, the maximum effective radius DT11 of the object side surface of the first lens E1 and the distance SAG1 from the maximum effective aperture of the object side surface of the first lens E1 to the intersection of the object side surface of the first lens E1 and the optical axis in the direction parallel to the optical axis satisfy: 3.5 < DT11 / SAG1 < 4.4, by limiting the range of the above formula, it is beneficial to avoid excessive bending of the object side surface of the first lens E1, reduce the processing difficulty of the first lens E1, avoid the problem of uneven coating caused by too much bending of the first lens E1, and make the large-angle light incident to the optical system, so as to ensure the imaging quality of the optical system, and by satisfying the upper limit of the relationship, the risk of ghosting caused by excessive flatness of the object side surface of the first lens E1 can be avoided.

[0068] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies: 8 < 5 * (SAG1 - SAG3) / (SAG1 + SAG3) < 11, where SAG1 is the distance from the maximum effective aperture of the object side of the first lens E1 to the intersection of the object side of the first lens E1 and the optical axis in the direction parallel to the optical axis, and SAG3 is the distance from the maximum effective aperture of the object side of the second lens E2 to the intersection of the object side of the second lens E2 and the optical axis in the direction parallel to the optical axis. By constraining the above formula within a reasonable range, the processing characteristics of the first lens E1 and the second lens E2 can be guaranteed, which is beneficial for assembly, and at the same time, the optical system has excellent image quality.

[0069] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies: 1.7 < (CT1 + CT6) / (SAG1 + SAG11) < 3.2, where SAG11 is the distance parallel to the optical axis from the maximum effective aperture of the object side of the sixth lens E6 to the intersection of the object side of the sixth lens E6 and the optical axis, CT1 is the center thickness of the first lens E1 on the optical axis, and CT6 is the center thickness of the sixth lens E6 on the optical axis. By constraining the above formula within a reasonable range, the center thicknesses of the first lens E1 and the sixth lens E6 can be ensured to be within a reasonable range, reducing astigmatism in the large-angle edge field of view, thereby improving the edge field of view resolution, and facilitating the forming and processing of the first lens E1 and the sixth lens E6.

[0070] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the first lens E1 is a spherical lens, and the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, and the sixth lens E6 are aspherical lenses. The maximum effective radius DT11 of the object side of the first lens E1 is ≤ 4.2 mm, the F-number of the optical system is 2.0, and the full field of view (FOV) and total optical length (TTL) of the optical system satisfy: 160° ≤ FOV ≤ 180°, TTL ≤ 9.6 mm. This design can reduce the total optical length and effectively miniaturize the lens. The head-mounted optical system configured in this invention has the advantages of high pixel count and wide angle, compact structure, easy processing and installation, and increases the light intake of the optical system and higher imaging quality.

[0071] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Figures 1-2 As shown in Example 1, the following components are arranged sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7, and an imaging surface S15.

[0072] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S3 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0073] In this embodiment 1, the lens focal length f = 1.02 mm, the focal length of the first lens E1 is f1 = -2.78 mm, the focal length of the second lens E2 is f2 = 10.16 mm, the focal length of the third lens E3 is f3 = 2.35 mm, the focal length of the fourth lens E4 is f4 = -2.87 mm, the focal length of the fifth lens E5 is f5 = 1.82 mm, the focal length of the sixth lens E6 is f6 = -2.72 mm, the total optical length TTL = 9.38 mm, the FOV = 172.4°, and the f / EPD = 2.00. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 1.

[0074] Table 1: Basic parameters of the optical system in Example 1

[0075] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ Sphere Infinite 300 S1 Sphere 9.2883 0.6000 1.77,49.50 S2 Sphere 1.7000 2.5716 S3 Asphere -3.9077 1.5028 1.64,23.53 S4 Asphere -2.8195 0.9605 STO Sphere Infinite -0.0899 S5 Asphere 1.8544 0.5915 1.54,55.77 S6 Asphere -3.5070 0.2327 S7 Asphere -28.4007 0.4000 1.66,20.38 S8 Asphere 2.0735 0.0388 S9 Asphere 2.7518 1.0595 1.54,55.77 S10 Asphere -1.3160 0.0991 S11 Asphere 8.8273 0.4500 1.66,20.38 S12 Asphere 1.4797 0.2539 S13 Asphere Sphere 0.2100 1.52,64.17 S14 Infinite Sphere 0.5041 S15 Infinite Sphere

[0076] Furthermore, in Table 1, the object-side surface and image-side surface of any one of the second lens E2 to the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0077]

[0078] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 2 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the first embodiment.

[0079] Table 2: Aspherical correlation values ​​of the lens surface in Example 1

[0080]

[0081] InfiniteThe diagram shows the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 1. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; distortion represents the magnitude of distortion at different image heights, determined by… Figure 2 It can be seen that the optical imaging system given in Example 1 can achieve good imaging quality and has the advantages of high pixel count and wide angle.

[0082] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Figure 2 As shown in Example 2, the optical axis includes, in sequence from the object side to the image side: a first lens E1, a second lens E2, a STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7, and an imaging surface S15.

[0083] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S3 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0084] In this embodiment 2, the lens focal length f = 1.11 mm, the focal length of the first lens E1 is f1 = -2.44 mm, the focal length of the second lens E2 is f2 = 9.14 mm, the focal length of the third lens E3 is f3 = 2.12 mm, the focal length of the fourth lens E4 is f4 = -2.65 mm, the focal length of the fifth lens E5 is f5 = 1.83 mm, the focal length of the sixth lens E6 is f6 = -3.19 mm, the total optical length TTL = 9.51 mm, the FOV = 179.79°, and the f / EPD = 2.00. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 3.

[0085] Table 3: Basic parameters of the optical system in Example 2

[0086] Figures 3-4 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ Sphere 300 S1 Infinite 7.3265 1.3738 1.88,39.22 S2 Sphere 1.5228 1.5493 S3 Sphere -3.3659 1.5514 1.66,20.38 S4 Asphere -2.5314 0.8459 Asphere STO Sphere 0.0371 S5 Infinite 2.3606 0.7726 1.54,55.77 S6 Asphere -1.9538 0.1541 S7 Asphere 440.6473 0.5242 1.66,20.38 S8 Asphere 1.7659 0.0837 S9 Asphere 4.5875 1.0657 1.54,55.77 S10 Asphere -1.1507 0.0522 S11 Asphere 5.1016 0.4698 1.66,20.38 S12 Asphere 1.4478 0.2783 S13 Asphere Asphere 0.2100 1.52,64.17 S14 Sphere Infinite 0.5460 S15 Sphere Infinite

[0087] Furthermore, in Table 3, the object-side surface and image-side surface of any one of the second lens E2 to the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0088]

[0089] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 4 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface in the first embodiment.

[0090] Table 4: Aspherical correlation values ​​of the lens surface in Example 2

[0091]

[0092] Sphere The diagram shows the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 2. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; distortion represents the magnitude of distortion at different image heights, determined by… Infinite It can be seen that the optical imaging system given in Example 2 can achieve good imaging quality and has the advantages of high pixel count and wide angle.

[0093] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Figure 4 As shown in Example 3, the optical structure includes, in sequence from the object side to the image side, the following elements: first lens E1, second lens E2, STO, third lens E3, fourth lens E4, fifth lens E5, sixth lens E6, infrared filter E7, and imaging surface S15.

[0094] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S3 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0095] In this embodiment 3, the lens focal length f = 1.11 mm, the focal length of the first lens E1 is f1 = -2.48 mm, the focal length of the second lens E2 is f2 = 6.39 mm, the focal length of the third lens E3 is f3 = 14.53 mm, the focal length of the fourth lens E4 is f4 = 100.00 mm, the focal length of the fifth lens E5 is f5 = 1.20 mm, the focal length of the sixth lens E6 is f6 = -2.42 mm, the total optical length TTL = 9.60 mm, the FOV = 161.24°, and the f / EPD = 2.00. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 5.

[0096] Table 5: Basic parameters of the optical system in Example 3

[0097] Figure 4 Figures 5-6 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ 300 S1 Sphere 8.4883 1.8244 1.91,35.25 S2 Infinite 1.5710 1.4820 S3 Sphere -3.9123 1.4519 1.66,20.38 S4 Sphere -2.3009 0.7349 Asphere Asphere STO 0.1224 S5 Sphere 2.1791 0.6111 1.54,55.77 S6 Infinite 2.7264 0.0707 S7 Asphere 2.1945 0.4000 1.66,20.38 S8 Asphere 2.1032 0.0317 S9 Asphere 2.2905 1.1760 1.54,55.77 S10 Asphere -1.0246 0.0300 S11 Asphere 13.7111 0.6205 1.66,20.38 S12 Asphere 1.4205 0.2833 S13 Asphere Asphere 0.2100 1.52,64.17 S14 Asphere Sphere 0.5510 S15 Infinite Sphere

[0098] Furthermore, in Table 5, the object-side surface and image-side surface of any one of the second lens E2 to the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0099]

[0100] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 6 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the first embodiment.

[0101] Table 6: Aspherical Correlation Values ​​of Lens Surface in Example 3

[0102]

[0103] Infinite The diagram shows the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 3. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; distortion represents the magnitude of distortion at different image heights, determined by… Sphere It can be seen that the optical imaging system given in Example 3 can achieve good imaging quality and has the advantages of high pixel count and wide angle.

[0104] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as InfiniteAs shown in Example 4, the following components are arranged sequentially from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7, and an imaging surface S15.

[0105] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The filter E7 has an object-side surface S3 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0106] In this embodiment 4, the lens focal length f = 1.13 mm, the focal length of the first lens E1 is f1 = -2.50 mm, the focal length of the second lens E2 is f2 = 6.56 mm, the focal length of the third lens E3 is f3 = -500.00 mm, the focal length of the fourth lens E4 is f4 = -8.20 mm, the focal length of the fifth lens E5 is f5 = 1.23 mm, the focal length of the sixth lens E6 is f6 = -2.20 mm, the total optical length TTL = 9.60 mm, the FOV = 160.26°, and the f / EPD = 2.00. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 7.

[0107] Table 7: Basic parameters of the optical system in Example 4

[0108] Figure 6 Figure 6 Figures 7-8 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material 300 S1 OBJ 8.3625 1.7817 1.91,35.25 S2 Sphere 1.5789 1.4553 S3 Infinite -4.1315 1.4937 1.66,20.38 S4 Sphere -2.3887 0.7267 Sphere Asphere Asphere 0.1241 S5 STO 2.2583 0.6129 1.54,55.77 S6 Sphere 2.0271 0.0356 S7 Infinite 1.7723 0.4000 1.66,20.38 S8 Asphere 1.2185 0.0300 S9 Asphere 1.0986 1.2166 1.54,55.77 S10 Asphere -1.0262 0.0300 S11 Asphere -160.0000 0.6660 1.66,20.38 S12 Asphere 1.4892 0.2762 S13 Asphere Asphere 0.2100 1.52,64.17 S14 Asphere Asphere 0.5414 S15 Sphere Infinite

[0109] Furthermore, in Table 7, the object-side surface and image-side surface of any one of the second lens E2 to the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0110]

[0111] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 8 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the first embodiment.

[0112] Table 8: Aspherical Correlation Values ​​of Lens Surface in Example 4

[0113]

[0114] Sphere The diagram shows the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 4. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; distortion represents the magnitude of distortion at different image heights, determined by… Infinite It can be seen that the optical imaging system given in Example 4 can achieve good imaging quality and has the advantages of high pixel count and wide angle.

[0115] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Sphere As shown in Example 5, the optical axis includes, in sequence from the object side to the image side: a first lens E1, a second lens E2, a STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, an infrared filter E7, and an imaging surface S15.

[0116] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S3 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0117] In this embodiment 5, the lens focal length f = 1.08 mm, the focal length of the first lens E1 is f1 = -2.48 mm, the focal length of the second lens E2 is f2 = 6.97 mm, the focal length of the third lens E3 is f3 = 2.63 mm, the focal length of the fourth lens E4 is f4 = -6.42 mm, the focal length of the fifth lens E5 is f5 = 2.01 mm, the focal length of the sixth lens E6 is f6 = -3.06 mm, the total optical length TTL = 9.60 mm, the FOV = 162.18°, and the f / EPD = 2.00. The surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 9.

[0118] Table 9: Basic Parameters of the Optical System in Example 5

[0119] Infinite Figure 8 Figure 8 Figures 9-10 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) 300 S1 Material 8.4637 1.8124 1.91,35.25 S2 OBJ 1.5721 1.5181 S3 Sphere -3.4138 1.6377 1.66,20.38 S4 Infinite -2.3075 0.8397 Sphere Sphere Asphere -0.0786 S5 Asphere 1.6495 0.6416 1.54,55.77 S6 STO -8.5558 0.0625 S7 Sphere -4.1126 0.4000 1.66,20.38 S8 Infinite -100.0000 0.0959 S9 Asphere -100.0000 0.9450 1.54,55.77 S10 Asphere -1.0719 0.0300 S11 Asphere 5.1283 0.5164 1.66,20.38 S12 Asphere 1.4040 0.3521 S13 Asphere Asphere 0.2100 1.52,64.17 S14 Asphere Asphere 0.6173 S15 Asphere Sphere

[0120] Furthermore, in Table 9, the object-side surface and image-side surface of any one of the second lens E2 to the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0121]

[0122] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 10 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the first embodiment.

[0123] Table 10: Aspherical correlation values ​​of the lens surface in Example 5

[0124]

[0125] Infinite The on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 5 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; distortion represents the magnitude of distortion at different image heights, determined by… Sphere It can be seen that the optical imaging system given in Example 5 can achieve good imaging quality and has the advantages of high pixel count and wide angle.

[0126] Furthermore, in Examples 1-5, the basic data is shown in Table 11:

[0127] Table 11: Basic Data for Examples 1-5

[0128] Infinite Sphere Infinite Figure 10 Figure 10 Basic Data Example 1 -2.78 -2.44 -2.48 -2.50 -2.48 Example 2 10.16 9.14 6.39 6.56 6.97 Example 3 2.35 2.12 14.53 -500.00 2.63 Example 4 -2.87 -2.65 100.00 -8.20 -6.42 Example 5 1.82 1.83 1.50 1.23 2.01 f1 (mm) -2.72 -3.19 -2.42 -2.20 -3.06 f2 (mm) 1.02 1.11 1.11 1.13 1.08 f3 (mm) 9.38 9.51 9.60 9.60 9.60 f4 (mm) 172.40 179.79 161.24 160.26 162.18 f5 (mm) 2.00 2.00 2.00 2.00 2.00

[0129] In further embodiments 1-5, each conditional expression satisfies the conditions in Table 12 below:

[0130] Table 12: Conditions for Each Example 1-5

[0131] f6 (mm) f (mm) TTL (mm) FOV (°) f / EPD Conditional Expression Example 1 0.60 1.37 1.82 1.78 1.81 Example 2 0.45 0.47 0.62 0.67 0.52 R1 9.29 7.33 8.49 8.36 8.46 R2 1.70 1.52 1.57 1.58 1.57 R3 -3.91 -3.37 -3.91 -4.13 -3.41 R11 8.83 5.10 13.71 -160.00 5.13 R12 1.48 1.45 1.42 1.49 1.40 f45 3.24 3.25 1.61 1.50 2.40 Example 3 4.20 3.92 4.14 4.06 4.10 Example 4 0.98 1.12 1.06 1.05 1.06 Example 5 -0.36 -0.30 -0.28 -0.27 -0.32 CT1 -0.36 -0.23 -0.24 -0.28 -0.15 CT6 18.37 18.90 16.80 16.69 16.89 DT11 -5.04 -3.70 -4.29 -3.55 -4.83 SAG1 -4.97 -4.02 -3.36 -2.73 -4.60 SAG3 -9.95 -9.60 -8.59 -7.79 -10.90 SAG11 1.40 1.79 1.23 0.98 1.75 FOV / TTL -2.60 -2.71 -1.63 -1.59 -2.04 (f5-f6) / (f5+f6) -3.68 -4.40 -3.40 -2.96 -4.36 f1*f5 / f 3.18 2.93 1.45 1.33 2.21 2*(R1+R2) / (R2+R3) 4.30 3.51 3.89 3.88 3.86 (R11+R12) / (R11-R12) 10.74 8.74 8.52 8.52 9.31 f5 / R3 2*f6 / R12 f45 / f DT11 / SAG1 5*(SAG1-SAG3) / (SAG1+SAG3) (CT1+CT6) / (SAG1+SAG11) 1.70 2.07 2.98 3.20 2.56

[0132] A head-mounted device includes at least an optical lens, within which is installed the aforementioned high-pixel, ultra-thin, wide-angle optical system. The head-mounted optical system configured in this invention has the advantages of high pixel count and wide-angle, a compact structure, and is easy to manufacture and install. At the same time, the large aperture configuration can increase the amount of light entering the optical system and achieve higher image quality, making the head-mounted optical system more competitive in the head-mounted device market.

[0133] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. A high-pixel, ultra-thin, wide-angle optical system, comprising, sequentially from the object plane to the image plane along the optical axis, a first lens, a second lens, an aperture stop, a third lens, a fourth lens, a fifth lens, and a sixth lens, characterized in that: The object-side surface of the first lens is convex, the image-side surface is concave, and its optical power is negative. The object-side surface of the second lens is concave, the image-side surface is convex, and its optical power is positive. The object-side surface of the third lens is convex. The object-side surface of the fifth lens is convex, and its optical power is positive. The object-side surface of the sixth lens is concave, and its optical power is negative. The optical system satisfies the following conditions: f / EPD < 2.0; 16deg / mm < FOV / TTL < 19deg / mm; -5.1 < (f5-f6) / (f5+f6) < -3.5; -5.0 < f1*f5 / f < -2.7; Where f is the effective focal length of the optical system, EPD is the entrance pupil diameter of the optical system, FOV is the maximum field of view of the optical system, TTL is the on-axis distance from the object side of the first lens to the imaging plane of the optical system, f1 is the effective focal length of the first lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

2. The high-pixel, ultra-thin, wide-angle optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: -11 < 2*(R1+R2) / (R2+R3) < -7.7; 0.9 < (R11+R12) / (R11-R12) < 1.8; Wherein, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, R3 is the radius of curvature of the object side of the second lens, R11 is the radius of curvature of the object side of the sixth lens, and R12 is the radius of curvature of the image side of the sixth lens.

3. The high-pixel, ultra-thin, wide-angle optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: -2.8 < f5 / R3 < -1.5; -4.5 < 2*f6 / R12 < -2.9; Wherein, R3 is the radius of curvature of the object side of the second lens, R12 is the radius of curvature of the image side of the sixth lens, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

4. The high-pixel, ultra-thin, wide-angle optical system according to claim 1, characterized in that, The effective combined focal length f45 of the fourth and fifth lenses and the effective focal length f of the optical system satisfy: 1.3 < f45 / f < 3.

2.

5. The high-pixel, ultra-thin, wide-angle optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: 3.5 < DT11 / SAG1 < 4.4; 8 < 5*(SAG1-SAG3) / (SAG1+SAG3) < 11; 1.7 < (CT1+CT6) / (SAG1+SAG11) < 3.2; Wherein, DT11 is the maximum effective radius of the side surface of the first lens, SAG1 is the distance from the maximum effective aperture of the side surface of the first lens to the intersection of the side surface of the first lens with the optical axis in the direction parallel to the optical axis, SAG3 is the distance from the maximum effective aperture of the side surface of the second lens to the intersection of the side surface of the second lens with the optical axis in the direction parallel to the optical axis, SAG11 is the distance from the maximum effective aperture of the side surface of the sixth lens to the intersection of the side surface of the sixth lens with the optical axis in the direction parallel to the optical axis, CT1 is the center thickness of the first lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis.

6. The high-pixel, ultra-thin, wide-angle optical system according to claim 1, characterized in that, The first lens is a spherical lens, and the second, third, fourth, fifth, and sixth lenses are aspherical lenses.

7. The high-pixel, ultra-thin, wide-angle optical system according to claim 1, characterized in that, The maximum effective radius DT11 of the object side of the first lens is ≤ 4.2 mm; and / or The F-number of the optical system is 2.

0.

8. The high-pixel, ultra-thin, wide-angle optical system according to claim 1, characterized in that, The optical system's full field of view (FOV) and total optical length (TTL) satisfy the following conditions: 160°≤FOV≤180°, TTL≤9.6 mm.

9. A head-mounted device, comprising at least an optical lens, characterized in that, The optical lens is equipped with the high-pixel, ultra-thin, wide-angle optical system as described in any one of claims 1-8.

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