Optical lens group of police law enforcement recorder

Abstract

The invention discloses an optical lens group of a police law enforcement recorder, which comprises seven lenses which sequentially comprise a first lens 11, a second lens 12, a third lens 13, an aperture 10, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17 from an object side to an image side, the optical lens group satisfies the following conditional expression: 0.012 lt; (CT1 to CT2) / EFLlt; 0.071, 0.07, 0.07; 1.9 lt, 1.9 lt; r < 14 > / EFLlt; 4; 0.4 lt; (R7-R8) / TTLlt; 0.6 part; on the basis of improving the imaging quality, the spherical aberration is corrected, the total length is adjusted, and the front group light receiving capability is internally adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of optical lenses, and in particular to an optical lens group of a police law enforcement recorder. Background Art

[0002] The law enforcement recorder, also known as the on-site law enforcement recorder or the single police law enforcement audio and video recorder, is a portable intelligent device that integrates multiple functions such as real-time audio and video recording, photo taking, and audio recording. It can record the on-site situation during law enforcement in various environments, and provide important on-site evidence for law enforcement departments such as public security, transportation, urban management, and justice. In recent years, with the continuous advancement of technology and the expansion of application scenarios, the market for police law enforcement recorders has shown a steady growth trend. In the future, law enforcement recorders will be more intelligent and data-based, integrating artificial intelligence technology, and have automatic recognition and analysis functions, such as facial recognition and voice-to-text, to improve the efficiency of on-site judgment and post-analysis. At present, the lens length of law enforcement recorders is generally more than 20mm, and the lens itself has a relatively large distortion, which requires post-software correction, or the use of more than eight lenses to achieve small distortion. The structure is relatively complex. In view of this situation, it is urgent to improve. Summary of the invention

[0003] In view of the above problems, the present invention provides an optical lens group for a police law enforcement recorder, which corrects spherical aberration, adjusts the total length, and internally adjusts the light receiving ability of the front group on the basis of improving the imaging quality.

[0004] To achieve the above-mentioned purpose, the present invention solves the problem through the following technical solutions: an optical lens group of a police law enforcement recorder, comprising seven lenses, which include, from the object side to the image side: a first lens with negative optical power, the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; a second lens with negative optical power, the object side surface of the second lens is concave at the near optical axis, and the image side surface of the second lens is concave at the near optical axis; a third lens with positive optical power, the object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens is concave at the near optical axis. Convex surface; aperture; a fourth lens with positive focal power, the object side surface of the fourth lens is convex at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis; a fifth lens with negative focal power, the object side surface of the fifth lens is concave at the near optical axis, and the image side surface of the fifth lens is concave at the near optical axis; a sixth lens with positive focal power, the object side surface of the sixth lens is convex at the near optical axis, and the image side surface of the sixth lens is convex at the near optical axis; a seventh lens with positive focal power, the object side surface of the seventh lens is convex at the near optical axis, and the image side surface of the seventh lens is concave at the near optical axis;

[0005] The optical lens group satisfies the following conditional formula:

[0006] 0.012 < |(CT1 - CT2) / EFL| < 0.071; where CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and EFL is the effective focal length of the optical lens group;

[0007] 1.9 < R14 / EFL < 4; where R14 is the radius of curvature of the image side of the seventh lens;

[0008] 0.4 < (R7 - R8) / TTL < 0.6; where R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, and TTL is the total lens length.

[0009] The present invention provides another optical lens group for a police law enforcement recorder, including seven lenses, which successively include from the object side to the image side: a first lens with a negative optical power, the object side of the first lens is convex near the optical axis, and the image side of the first lens is concave near the optical axis; a second lens with a negative optical power, the object side of the second lens is concave near the optical axis, and the image side of the second lens is concave near the optical axis; a third lens with a positive optical power, the object side of the third lens is convex near the optical axis, and the image side of the third lens is convex near the optical axis; an aperture; a fourth lens with a positive optical power, the object side of the fourth lens is convex near the optical axis, and the image side of the fourth lens is convex near the optical axis; a fifth lens with a negative optical power, the object side of the fifth lens is concave near the optical axis, and the image side of the fifth lens is concave near the optical axis; a sixth lens with a positive optical power, the object side of the sixth lens is convex near the optical axis, and the image side of the sixth lens is convex near the optical axis; a seventh lens with a positive optical power, the object side of the seventh lens is convex near the optical axis, and the image side of the seventh lens is concave near the optical axis;

[0010] The optical lens group satisfies the following conditional expressions:

[0011] 0.04 < |(AT34 - AT23) / EFL| < 0.23; where AT34 is the air gap between the third lens and the fourth lens, AT23 is the air gap between the second lens and the third lens, and EFL is the effective focal length of the optical lens group;

[0012] 1.9 < R14 / EFL < 4; where R14 is the radius of curvature of the image side of the seventh lens;

[0013] 0.3 < (f6 - f2) / TTL < 0.5; where f6 is the focal length of the sixth lens, f2 is the focal length of the second lens, and TTL is the total lens length.

[0014] Preferably, the optical lens group satisfies the following conditions:

[0015] 1.6 < AT67 * TTL < 3.4; wherein, AT67 is the distance on the optical axis from the image side of the sixth lens to the object side of the seventh lens;

[0016] 1.3 < (f7 - f2) / TTL < 1.7; wherein, f7 is the focal length of the seventh lens, and f2 is the focal length of the second lens;

[0017] 0.8 < (CT4 + CT5) / EFL < 1; wherein, CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis;

[0018] 0.007 < (AT34 - AT67) * (CT1 - CT2) < 0.101; wherein, AT34 is the air gap between the third lens and the fourth lens, CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.

[0019] Preferably, the optical lens group satisfies the following condition: 3 < (AT34 - AT67) / (CT1 - CT2) < 10.5; wherein, AT34 is the air gap between the third lens and the fourth lens, AT67 is the distance on the optical axis from the image side of the sixth lens to the object side of the seventh lens, CT1 is the thickness of the first lens on the optical axis, and CT2 is the thickness of the second lens on the optical axis.

[0020] Preferably, the optical lens group satisfies the following condition: -8 < AT34 * f123 < -4; wherein, AT34 is the air gap between the third lens and the fourth lens, and f123 is the combined focal length of the first lens, the second lens, and the third lens.

[0021] Preferably, the optical lens group satisfies the following conditions:

[0022] 1.2 < (R4 - R3) / TTL < 1.5; wherein, R4 is the radius of curvature of the image side of the second lens, and R3 is the radius of curvature of the object side of the second lens;

[0023] 0.3 < (R11 - R12) / TTL < 0.5; wherein, 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;

[0024] 0.4 < (R13 + R14) / TTL < 0.9; wherein, R13 is the radius of curvature of the object side of the seventh lens, and R14 is the radius of curvature of the image side of the seventh lens;

[0025] 0.6 < R4 / (nd1 * nd3) < 0.78; where nd1 is the refractive index of the first lens and nd3 is the refractive index of the third lens;

[0026] 432 < (Vd1 * Vd3) / R4 < 555; where Vd1 is the dispersion coefficient of the first lens and Vd3 is the dispersion coefficient of the third lens.

[0027] Preferably, the optical lens group satisfies the following conditions:

[0028] 0.12 < (AT34 - AT67) / EFL < 0.31; where AT34 is the air gap between the third lens and the fourth lens, and AT67 is the distance on the optical axis from the image side of the sixth lens to the object side of the seventh lens;

[0029] 0.026 < (AT34 - AT23) * (AT34 - AT67) < 0.36; where AT23 is the air gap between the second lens and the third lens;

[0030] 0.35 < (AT34 - AT23) / (AT34 - AT67) < 0.75.

[0031] Preferably, the optical lens group satisfies the following conditions: -2.3 < f123 / f4567 < -1.8; where f123 is the combined focal length of the first lens, the second lens, and the third lens, and f4567 is the combined focal length of the fourth lens, the fifth lens, the sixth lens, and the seventh lens.

[0032] Preferably, the optical lens group satisfies the following conditions: 3.2 < (R11 - R12) * (R13 + R14) / TTL < 5.4; where R11 is the curvature radius of the object side of the sixth lens, R12 is the curvature radius of the image side of the sixth lens, R13 is the curvature radius of the object side of the seventh lens, and R14 is the curvature radius of the image side of the seventh lens.

[0033] Preferably, the optical lens group satisfies the following conditions: 0.002 < (CT1 - CT2) * (AT34 - AT23) < 0.075; where CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, AT34 is the air gap between the third lens and the fourth lens, and AT23 is the air gap between the second lens and the third lens.

[0034] The beneficial effects of the present invention are:

[0035] 1. Meeting the conditional formula 0.012 < |(CT1 - CT2) / EFL| < 0.071 helps to control the total length of the optical lens group;

[0036] 2. Meeting the conditional formulas 1.9 < R14 / EFL < 4, 0.4 < (R7 - R8) / TTL < 0.6, 1.2 < (R4 - R3) / TTL < 1.5, 0.3 < (R11 - R12) / TTL < 0.5, 0.4 < (R13 + R14) / TTL < 0.9, 0.6 < R4 / (nd1 * nd3) < 0.78, 432 < (Vd1 * Vd3) / R4 < 555, -2.3 < f123 / f4567 < -1.8, 3.2 < (R11 - R12) * (R13 + R14) / TTL < 5.4 is beneficial to reducing the field curvature aberration and correcting the chromatic aberration of the optical lens group;

[0037] 3. Meeting the conditional formula 0.04 < |(AT34 - AT23) / EFL| < 0.23 helps to control the total length of the optical lens group to increase the usage scenarios;

[0038] 4. Meeting the conditional formulas 0.3 < (f6 - f2) / TTL < 0.5, 1.6 < AT67 * TTL < 3.4, 1.3 < (f7 - f2) / TTL < 1.7, 0.8 < (CT4 + CT5) / EFL < 1, 0.007 < (AT34 - AT67) * (CT1 - CT2) < 0.101 helps to control the total length of the optical lens group;

[0039] 5. Meeting the conditional formula -8 < AT34 * f123 < -4 can appropriately adjust the refractive power of the front lens group of the optical lens group and balance the configuration of the third lens and the fourth lens;

[0040] 6. Meeting the conditional formulas 0.12 < (AT34 - AT67) / EFL < 0.31, 0.026 < (AT34 - AT23) * (AT34 - AT67) < 0.36, 0.35 < (AT34 - AT23) / (AT34 - AT67) < 0.75 to avoid too large a relative interval distance between the lenses;

[0041] 7. Meeting the conditional formula 0.002 < (CT1 - CT2) * (AT34 - AT23) < 0.075 can adjust the lens distribution of the optical lens group, which helps to adjust the overall distribution and form a wide-angle configuration, improving the imaging quality. Description of the Drawings

[0042] Figure 1 It is a schematic structural diagram of the optical lens group of Example 1.

[0043] Figure 2This is a spherical aberration diagram of the optical lens group of Example 1.

[0044] Figure 3 This is a field curvature diagram of the optical lens group of Example 1.

[0045] Figure 4 This is an optical distortion diagram of the optical lens group of Example 1.

[0046] Figure 5 This is the longitudinal chromatic aberration of the optical lens group of Example 1.

[0047] Figure 6 Schematic diagram of the structure of the optical lens assembly of Example 2.

[0048] Figure 7 This is a spherical aberration diagram of the optical lens group of Example 2.

[0049] Figure 8 This is a field curvature diagram of the optical lens group of Example 2.

[0050] Fig. 9 This is an optical distortion diagram of the optical lens group of Example 2.

[0051] Fig.10 This is the longitudinal chromatic aberration of the optical lens group of Example 2.

[0052] Fig.11 This is a schematic diagram of the structure of the optical lens assembly of Example 3.

[0053] Fig.12 This is a spherical aberration diagram of the optical lens group of Example 3.

[0054] Fig.13 This is a field curvature diagram of the optical lens group of Example 3.

[0055] Fig.14 This is an optical distortion diagram of the optical lens group of Example 3.

[0056] Fig.15 This is the longitudinal chromatic aberration of the optical lens group of Example 3.

[0057] The reference numerals are: a first lens 11 , a second lens 12 , a third lens 13 , a fourth lens 14 , a fifth lens 15 , a sixth lens 16 , a seventh lens 17 , a filter element 18 , and an aperture 10 . DETAILED DESCRIPTION

[0058] The present invention is further described in detail below in conjunction with examples and drawings, but the embodiments of the present invention are not limited thereto.

[0059] The present invention discloses that the present invention solves the problem through the following technical solutions:

[0060] A police law enforcement recorder optical lens group includes seven lenses, which successively include from the object side to the image side: a first lens 11 with a negative optical power, the object side surface of the first lens 11 is convex near the optical axis, and the image side surface of the first lens 11 is concave near the optical axis; a second lens 12 with a negative optical power, the object side surface of the second lens 12 is concave near the optical axis, and the image side surface of the second lens 12 is concave near the optical axis; a third lens 13 with a positive optical power, the object side surface of the third lens 13 is convex near the optical axis, and the image side surface of the third lens 13 is convex near the optical axis; an aperture 10; a fourth lens 14 with a positive optical power, the object side surface of the fourth lens 14 is convex near the optical axis, and the image side surface of the fourth lens 14 is convex near the optical axis; a fifth lens 15 with a negative optical power, the object side surface of the fifth lens 15 is concave near the optical axis, and the image side surface of the fifth lens 15 is concave near the optical axis; a sixth lens 16 with a positive optical power, the object side surface of the sixth lens 16 is convex near the optical axis, and the image side surface of the sixth lens 16 is convex near the optical axis; a seventh lens 17 with a positive optical power, the object side surface of the seventh lens 17 is convex near the optical axis, and the image side surface of the seventh lens 17 is concave near the optical axis; in actual use, a filter element 18 is provided between the seventh lens 17 and the image side surface and on the side close to the seventh lens 17;

[0061] The optical lens group satisfies the following conditional expressions:

[0062] 0.012 < |(CT1 - CT2) / EFL| < 0.071; where CT1 is the thickness of the first lens 11 on the optical axis, CT2 is the thickness of the second lens 12 on the optical axis, and EFL is the effective focal length of the optical lens group; conforming to this conditional expression can control the thickness difference between the first lens 11 and the second lens 12 on the optical axis, which helps to control the total length of the optical lens group;

[0063] 1.9 < R14 / EFL < 4; where R14 is the radius of curvature of the image side surface of the seventh lens 17; conforming to this conditional expression can appropriately control the size of the radius of curvature of the image side surface of the seventh lens 17, which is beneficial to reducing the field curvature aberration and correcting the chromatic aberration of the optical lens group;

[0064] 0.4 < (R7 - R8) / TTL < 0.6; where R7 is the radius of curvature of the object side surface of the fourth lens 14, R8 is the radius of curvature of the image side surface of the fourth lens 14, and TTL is the total lens length. Conforming to this conditional expression can appropriately control the size of the radius of curvature of the fourth lens 14, which is beneficial to reducing the field curvature aberration and correcting the chromatic aberration.

[0065] The present invention provides another optical lens group for a police law enforcement recorder, which includes seven lenses. In order from the object side to the image side, it includes: a first lens 11 with a negative optical power, the object side surface of the first lens 11 is convex near the optical axis, and the image side surface of the first lens 11 is concave near the optical axis; a second lens 12 with a negative optical power, the object side surface of the second lens 12 is concave near the optical axis, and the image side surface of the second lens 12 is concave near the optical axis; a third lens 13 with a positive optical power, the object side surface of the third lens 13 is convex near the optical axis, and the image side surface of the third lens 13 is convex near the optical axis; an aperture 10; a fourth lens 14 with a positive optical power, the object side surface of the fourth lens 14 is convex near the optical axis, and the image side surface of the fourth lens 14 is convex near the optical axis; a fifth lens 15 with a negative optical power, the object side surface of the fifth lens 15 is concave near the optical axis, and the image side surface of the fifth lens 15 is concave near the optical axis; a sixth lens 16 with a positive optical power, the object side surface of the sixth lens 16 is convex near the optical axis, and the image side surface of the sixth lens 16 is convex near the optical axis; a seventh lens 17 with a positive optical power, the object side surface of the seventh lens 17 is convex near the optical axis, and the image side surface of the seventh lens 17 is concave near the optical axis; in actual use, a filter element 18 is provided between the seventh lens 17 and the image side surface and on the side close to the seventh lens 17;

[0066] The optical lens group satisfies the following conditional expressions:

[0067] 0.04 < |(AT34 - AT23) / EFL| < 0.23; where AT34 is the air gap between the third lens 13 and the fourth lens 14, AT23 is the air gap between the second lens 12 and the third lens 13, and EFL is the effective focal length of the optical lens group; meeting this conditional expression can balance the configurations of the second lens 12, the third lens 13, and the fourth lens 14, so as to facilitate controlling the overall length of the lens and thus increasing the usage scenarios;

[0068] 1.9 < R14 / EFL < 4; where R14 is the radius of curvature of the image side surface of the seventh lens 17; meeting this conditional expression can appropriately control the radius of curvature of the image side surface of the seventh lens 17, which is beneficial to reducing the field curvature aberration and correcting the chromatic aberration of the optical lens group.

[0069] 0.3 < (f6 - f2) / TTL < 0.5; where f6 is the focal length of the sixth lens 16, f2 is the focal length of the second lens 12, and TTL is the total lens length. Meeting this conditional expression helps to control an appropriate ratio of the focal lengths of the second lens 12 and the sixth lens 16 to the overall system length.

[0070] Preferably, the optical lens group satisfies the following conditions:

[0071] 1.6 < AT67 * TTL < 3.4; where AT67 is the distance on the optical axis from the image side of the sixth lens 16 to the object side of the seventh lens 17; meeting this conditional formula can balance the configurations of the sixth lens 16 and the seventh lens 17 and effectively control the overall system length;

[0072] 1.3 < (f7 - f2) / TTL < 1.7; where f7 is the focal length of the seventh lens 17 and f2 is the focal length of the second lens 12; meeting this conditional formula helps to control an appropriate ratio of the focal lengths of the second lens 12 and the seventh lens 17 and the overall system length;

[0073] 0.8 < (CT4 + CT5) / EFL < 1; where CT4 is the thickness on the optical axis of the fourth lens 14 and CT5 is the thickness on the optical axis of the fifth lens 15; meeting this conditional formula can control the sum of the thicknesses of the fourth lens 14 and the fifth lens 15 on the optical axis and helps to control the overall length of the optical lens group;

[0074] 0.007 < (AT34 - AT67) * (CT1 - CT2) < 0.101; where AT34 is the air gap between the third lens 13 and the fourth lens 14, CT1 is the thickness on the optical axis of the first lens 11, and CT2 is the thickness on the optical axis of the second lens 12. Meeting this conditional formula helps to control the overall length of the optical lens group and is beneficial to the miniaturization of the optical lens group.

[0075] Preferably, the optical lens group meets the following condition: 3 < (AT34 - AT67) / (CT1 - CT2) < 10.5; where AT34 is the air gap between the third lens 13 and the fourth lens 14, AT67 is the distance on the optical axis from the image side of the sixth lens 16 to the object side of the seventh lens 17, CT1 is the thickness on the optical axis of the first lens 11, and CT2 is the thickness on the optical axis of the second lens 12. Meeting this conditional formula helps to control the overall length of the optical lens group and is beneficial to the miniaturization of the optical lens group.

[0076] Preferably, the optical lens group meets the following condition: -8 < AT34 * f123 < -4; where AT34 is the air gap between the third lens 13 and the fourth lens 14 and f123 is the combined focal length of the first lens 11, the second lens 12, and the third lens 13. Meeting this conditional formula can appropriately adjust the refractive power of the front lens group of the optical lens group and balance the configurations of the third lens 13 and the fourth lens 14.

[0077] Preferably, the optical lens group meets the following conditions:

[0078] 1.2 < (R4 - R3) / TTL < 1.5; where R4 is the radius of curvature of the image side of the second lens 12, and R3 is the radius of curvature of the object side of the second lens 12. Meeting this conditional expression can appropriately control the radius of curvature of the second lens 12, which is beneficial to reducing the field curvature aberration of the optical lens group and correcting the chromatic aberration.

[0079] 0.3 < (R11 - R12) / TTL < 0.5; where R11 is the radius of curvature of the object side of the sixth lens 16, and R12 is the radius of curvature of the image side of the sixth lens 16. Meeting this conditional expression can appropriately control the radius of curvature of the sixth lens 16, which is beneficial to reducing the field curvature aberration of the optical lens group and correcting the chromatic aberration.

[0080] 0.4 < (R13 + R14) / TTL < 0.9; where R13 is the radius of curvature of the object side of the seventh lens 17, and R14 is the radius of curvature of the image side of the seventh lens 17. Meeting this conditional expression can appropriately control the radius of curvature of the seventh lens 17, which is beneficial to reducing the field curvature aberration of the optical lens group and correcting the chromatic aberration.

[0081] 0.6 < R4 / (nd1 * nd3) < 0.78; where nd1 is the refractive index of the first lens 11, and nd3 is the refractive index of the third lens 13. Meeting this conditional expression can increase the elasticity of material use, adjust the lens material, help correct the chromatic aberration, and improve the imaging quality.

[0082] 432 < (Vd1 * Vd3) / R4 < 555; where Vd1 is the dispersion coefficient of the first lens 11, and Vd3 is the dispersion coefficient of the third lens 13. Meeting this conditional expression can increase the elasticity of material use, obtain a better chromatic aberration balance force, balance the material configuration of the first lens 11 and the third lens 13 to correct the chromatic aberration and improve the imaging quality.

[0083] Preferably, the optical lens group meets the following conditions:

[0084] 0.12 < (AT34 - AT67) / EFL < 0.31; where AT34 is the air gap between the third lens 13 and the fourth lens 14, and AT67 is the distance on the optical axis from the image side of the sixth lens 16 to the object side of the seventh lens 17. Meeting this conditional expression can balance the spatial configuration of the third lens 13, the fourth lens 14, the sixth lens 16, and the seventh lens 17 to avoid an overly large relative gap distance.

[0085] 0.026 < (AT34 - AT23) * (AT34 - AT67) < 0.36, 0.35 < (AT34 - AT23) / (AT34 - AT67) < 0.75, where AT23 is the air gap between the second lens 12 and the third lens 13; meeting this conditional expression can balance the spatial configurations of the third lens 13, the fourth lens 14, the sixth lens 16, and the seventh lens 17 to avoid an overly large relative gap distance.

[0086] Preferably, the optical lens group satisfies the following condition: -2.3 < f123 / f4567 < -1.8; where f123 is the combined focal length of the first lens 11, the second lens 12, and the third lens 13, and f4567 is the combined focal length of the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17. Meeting this conditional expression can appropriately distribute the refractive powers of the front and rear lens groups of the optical lens group, enabling the front lens group to have an appropriate refractive power, avoiding overly divergent light transmitted to the aperture, and increasing the burden on the positive refractive power of the rear lens group.

[0087] Preferably, the optical lens group satisfies the following condition: 3.2 < (R11 - R12) * (R13 + R14) / TTL < 5.4; where R11 is the curvature radius of the object side of the sixth lens 16, R12 is the curvature radius of the image side of the sixth lens 16, R13 is the curvature radius of the object side of the seventh lens 17, and R14 is the curvature radius of the image side of the seventh lens 17. Meeting this conditional expression can appropriately control the curvature radii of the sixth lens 16 and the seventh lens 17, which is beneficial for reducing the field curvature aberration and correcting the chromatic aberration of the optical lens group.

[0088] Preferably, the optical lens group satisfies the following condition: 0.002 < (CT1 - CT2) * (AT34 - AT23) < 0.075; where CT1 is the thickness of the first lens 11 on the optical axis, CT2 is the thickness of the second lens 12 on the optical axis, AT34 is the air gap between the third lens 13 and the fourth lens 14, and AT23 is the air gap between the second lens 12 and the third lens 13. Meeting this conditional expression can adjust the lens distribution of the optical lens group, which helps to adjust the overall distribution and form a wide-angle configuration to improve the imaging quality.

[0089] Example 1, as Figure 1-5 shown, the first lens 11 and the third lens 13 are made of glass, and the second lens 12, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 are made of plastic. For an optical lens group of a police law enforcement recorder provided in this example, the relevant parameters of each lens are shown in Table 1-1, and the aspheric parameters of each lens in this example are shown in Tables 1-2.1 and 1-2.2.

[0090] Table 1-1

[0091]

[0092]

[0093] Table 1-2.1

[0094] 12a 12b 14a 14b 15a 15b 16a 16b K 1.86E+01 -1.41E+00 1.70E+00 -4.93E+00 -2.39E+00 -9.02E+01 -1.72E+01 4.12E-01 A4 -3.19E-03 6.04E-03 -4.20E-03 -5.41E-02 -2.67E-02 -7.12E-03 -8.05E-04 7.22E-03 A6 -3.94E-04 -3.18E-03 -1.21E-02 -1.40E-02 -2.02E-02 3.91E-03 -7.07E-04 2.83E-04 A8 1.50E-04 9.22E-04 5.53E-03 1.35E-03 6.07E-03 -5.73E-04 2.68E-04 -1.04E-04 A10 -6.20E-06 -9.17E-05 4.56E-03 9.60E-04 5.67E-04 3.14E-04 -2.23E-05 1.67E-05 A12 -4.50E-06 -1.28E-05 -6.02E-03 -1.31E-04 -6.05E-04 -1.39E-04 0.00E+00 0.00E+00 A14 8.80E-07 4.68E-06 -9.28E-03 -2.87E-04 1.02E-04 2.53E-05 0.00E+00 0.00E+00 A16 -5.27E-08 -5.22E-07 7.89E-03 1.05E-04 2.67E-05 -1.83E-06 0.00E+00 0.00E+00

[0095] Table 1-2.2

[0096] 17a 17b K -3.37E+00 -2.36E+01 A4 -9.39E-04 -2.30E-03 A6 -4.59E-05 2.02E-05 A8 7.23E-06 -4.39E-06 A10 -2.05E-07 1.79E-07 A12 0.00E+00 0.00E+00 A14 0.00E+00 0.00E+00 A16 0.00E+00 0.00E+00

[0097] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0098]

[0099] Where X: the distance between the point on the aspherical surface at a distance Y from the optical axis and the tangent plane between the aspherical surface and the optical axis;

[0100] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0101] R: radius of curvature of the lens at the near optical axis;

[0102] K: cone coefficient;

[0103] A i : i-th order aspheric coefficient.

[0104] Embodiment 2, as Figure 6-10 As shown, the first lens 11 and the third lens 13 are made of glass, and the second lens 12, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 are made of plastic. This embodiment provides an optical lens group for a police law enforcement recorder, and the relevant parameters of each lens are shown in Table 2-1. The parameters of the aspherical surfaces of each lens in this embodiment are shown in Tables 2-2.1 and 2-2.2.

[0105] Table 2-1

[0106]

[0107] Table 2-2.1

[0108] 22a 22b 24a 24b 25a 25b 26a 26b K 1.20E+01 -1.46E+00 -5.73E-01 -7.76E+00 -3.27E+00 -4.25E+01 -1.56E+01 -3.56E-01 A4 -4.66E-03 1.32E-03 -3.01E-03 -3.87E-02 -1.00E-02 -1.03E-02 1.54E-03 7.94E-03 A6 3.35E-04 -1.98E-03 -2.74E-03 -4.50E-03 -2.26E-02 3.75E-03 -1.39E-03 -2.03E-04 A8 2.04E-05 8.39E-04 -9.13E-04 -3.48E-03 6.94E-03 -4.72E-04 2.78E-04 -9.38E-05 A10 -7.87E-06 -1.59E-04 6.11E-04 4.99E-04 5.38E-04 2.64E-04 -1.57E-05 1.19E-05 A12 -8.96E-07 -5.29E-06 6.55E-05 9.50E-04 -1.01E-03 -1.06E-04 0.00E+00 0.00E+00 A14 3.41E-07 5.90E-06 -6.44E-04 -3.99E-04 3.07E-04 1.90E-05 0.00E+00 0.00E+00 A16 -2.24E-08 -5.52E-07 9.87E-05 4.00E-05 -2.51E-05 -1.28E-06 0.00E+00 0.00E+00

[0109] Table 2-2.2

[0110]

[0111]

[0112] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0113]

[0114] Where X: the distance between the point on the aspherical surface at a distance Y from the optical axis and the tangent plane between the aspherical surface and the optical axis;

[0115] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0116] R: radius of curvature of the lens at the near optical axis;

[0117] K: cone coefficient;

[0118] A i : i-th order aspheric coefficient.

[0119] Embodiment 3, as Figure 11-15 As shown, the first lens 11 and the third lens 13 are made of glass, and the second lens 12, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 are made of plastic. This embodiment provides an optical lens group for a police law enforcement recorder, and the relevant parameters of each lens are shown in Table 3-1. The parameters of the aspherical surfaces of each lens in this embodiment are shown in Tables 3-3.1 and 3-3.2.

[0120] Table 3-1

[0121]

[0122]

[0123] Table 3-2.1

[0124] 32a 32b 34a 34b 35a 35b 36a 36b K -1.77E+01 -1.82E+00 -6.69E+00 -6.53E+00 -3.59E+00 -2.27E+01 -1.58E+01 2.18E-01 A4 -4.65E-03 3.04E-03 -7.74E-03 -4.24E-02 -2.90E-03 -5.99E-03 2.15E-03 4.91E-03 A6 3.65E-04 -1.60E-03 -1.32E-03 -1.46E-03 -1.91E-02 3.13E-03 -1.83E-03 -4.78E-05 A8 4.09E-05 7.61E-04 -3.40E-03 -1.08E-03 8.08E-03 -6.24E-04 3.40E-04 5.32E-06 A10 -1.49E-05 -1.56E-04 3.34E-04 4.30E-04 5.27E-04 3.45E-04 -1.36E-05 3.23E-06 A12 -1.71E-06 -1.34E-05 8.99E-04 3.82E-04 -1.10E-03 -1.10E-04 1.41E-06 -5.49E-07 A14 7.55E-07 8.99E-06 -1.12E-03 -2.97E-04 2.17E-04 1.29E-05 -3.74E-07 -2.51E-09 A16 -5.66E-08 -8.76E-07 2.92E-04 4.33E-05 -9.09E-06 -4.64E-07 1.49E-08 2.12E-08

[0125] Table 3-2.2

[0126] 37a 37b K -2.73E+00 -4.44E+00 A4 -3.62E-03 -6.53E-03 A6 -2.75E-04 7.57E-05 A8 3.31E-05 1.03E-05 A10 -6.32E-07 -6.64E-07 A12 -5.66E-09 0.00E+00 A14 -3.56E-09 0.00E+00 A16 2.55E-10 0.00E+00

[0127] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0128]

[0129] Where X: the distance between the point on the aspherical surface at a distance Y from the optical axis and the tangent plane between the aspherical surface and the optical axis;

[0130] Y: the vertical distance between the point on the aspherical surface and the optical axis;

[0131] R: radius of curvature of the lens at the near optical axis;

[0132] K: cone coefficient;

[0133] A i: i-th order aspheric coefficient.

[0134] The above embodiments only express three implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. An optical lens assembly for a police law enforcement recorder, characterized in that: Comprising seven lenses, which sequentially include from the object side to the image side: A first lens (11) with a negative optical power, the object side surface of the first lens (11) being convex near the optical axis, and the image side surface of the first lens (11) being concave near the optical axis; A second lens (12) with a negative optical power, the object side surface of the second lens (12) being concave near the optical axis, and the image side surface of the second lens (12) being concave near the optical axis; A third lens (13) with a positive optical power, the object side surface of the third lens (13) being convex near the optical axis, and the image side surface of the third lens (13) being convex near the optical axis; An aperture (10); A fourth lens (14) with a positive optical power, the object side surface of the fourth lens (14) being convex near the optical axis, and the image side surface of the fourth lens (14) being convex near the optical axis; A fifth lens (15) with a negative optical power, the object side surface of the fifth lens (15) being concave near the optical axis, and the image side surface of the fifth lens (15) being concave near the optical axis; A sixth lens (16) with a positive optical power, the object side surface of the sixth lens (16) being convex near the optical axis, and the image side surface of the sixth lens (16) being convex near the optical axis; A seventh lens (17) with a positive optical power, the object side surface of the seventh lens (17) being convex near the optical axis, and the image side surface of the seventh lens (17) being concave near the optical axis; The optical lens group satisfies the following conditional expressions: 0.012 < |(CT1 - CT2) / EFL| < 0.071; where CT1 is the thickness of the first lens (11) on the optical axis, CT2 is the thickness of the second lens (12) on the optical axis, and EFL is the effective focal length of the optical lens group; 1.9 < R14 / EFL < 4; where R14 is the radius of curvature of the image side surface of the seventh lens (17); 0.4 < (R7 - R8) / TTL < 0.6; where R7 is the radius of curvature of the object side surface of the fourth lens (14), R8 is the radius of curvature of the image side surface of the fourth lens (14), and TTL is the total lens length.

2. An optical lens assembly for a police law enforcement recorder, characterized in that: Comprising seven lenses, which sequentially include from the object side to the image side: A first lens (11) with a negative optical power, the object side surface of the first lens (11) being convex near the optical axis, and the image side surface of the first lens (11) being concave near the optical axis; A second lens (12) with a negative optical power, the object side surface of the second lens (12) being concave near the optical axis, and the image side surface of the second lens (12) being concave near the optical axis; A third lens (13) with a positive optical power, the object side surface of the third lens (13) being convex near the optical axis, and the image side surface of the third lens (13) being convex near the optical axis; An aperture (10); A fourth lens (14) with a positive optical power, the object side surface of the fourth lens (14) being convex near the optical axis, and the image side surface of the fourth lens (14) being convex near the optical axis; A fifth lens (15) with a negative optical power, the object side surface of the fifth lens (15) being concave near the optical axis, and the image side surface of the fifth lens (15) being concave near the optical axis; The sixth lens (16) having a positive refractive power, the object side of the sixth lens (16) near the optical axis is convex, and the image side of the sixth lens (16) near the optical axis is convex; The seventh lens (17) having a positive refractive power, the object side of the seventh lens (17) near the optical axis is convex, and the image side of the seventh lens (17) near the optical axis is concave; The optical lens group satisfies the following conditional expressions: 0.04 < |(AT34 - AT23) / EFL| < 0.23; where, AT34 is the air gap between the third lens (13) and the fourth lens (14), AT23 is the air gap between the second lens (12) and the third lens (13), and EFL is the effective focal length of the optical lens group; 1.9 < R14 / EFL < 4; where, R14 is the radius of curvature of the image side of the seventh lens (17); 0.3 < (f6 - f2) / TTL < 0.5; where, f6 is the focal length of the sixth lens (16), f2 is the focal length of the second lens (12), and TTL is the total lens length.

3. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 1.6 < AT67*TTL < 3.4; where, AT67 is the distance on the optical axis from the image side of the sixth lens (16) to the object side of the seventh lens (17); 1.3 < (f7 - f2) / TTL < 1.7; where, f7 is the focal length of the seventh lens (17), and f2 is the focal length of the second lens (12); 0.8 < (CT4 + CT5) / EFL < 1; where, CT4 is the thickness of the fourth lens (14) on the optical axis, and CT5 is the thickness of the fifth lens (15) on the optical axis; 0.007 < (AT34 - AT67)*(CT1 - CT2) < 0.101; where, AT34 is the air gap between the third lens (13) and the fourth lens (14), CT1 is the thickness of the first lens (11) on the optical axis, and CT2 is the thickness of the second lens (12) on the optical axis.

4. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 3 < (AT34 - AT67) / (CT1 - CT2) < 10.5; where, AT34 is the air gap between the third lens (13) and the fourth lens (14), AT67 is the distance on the optical axis from the image side of the sixth lens (16) to the object side of the seventh lens (17), CT1 is the thickness of the first lens (11) on the optical axis, and CT2 is the thickness of the second lens (12) on the optical axis.

5. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: -8 < AT34*f123 < -4; where, AT34 is the air gap between the third lens (13) and the fourth lens (14), and f123 is the combined focal length of the first lens (11), the second lens (12), and the third lens (13).

6. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 1.2 < (R4 - R3) / TTL < 1.5; where R4 is the radius of curvature of the image side of the second lens (12), and R3 is the radius of curvature of the object side of the second lens (12); 0.3 < (R11 - R12) / TTL < 0.5; where R11 is the radius of curvature of the object side of the sixth lens (16), and R12 is the radius of curvature of the image side of the sixth lens (16); 0.4 < (R13 + R14) / TTL < 0.9; where R13 is the radius of curvature of the object side of the seventh lens (17), and R14 is the radius of curvature of the image side of the seventh lens (17); 0.6 < R4 / (nd1 * nd3) < 0.78; where nd1 is the refractive index of the first lens (11), and nd3 is the refractive index of the third lens (13); 432 < (Vd1 * Vd3) / R4 < 555; where Vd1 is the dispersion coefficient of the first lens (11), and Vd3 is the dispersion coefficient of the third lens (13).

7. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 0.12 < (AT34 - AT67) / EFL < 0.31; where AT34 is the air gap between the third lens (13) and the fourth lens (14), and AT67 is the distance on the optical axis from the image side of the sixth lens (16) to the object side of the seventh lens (17); 0.026 < (AT34 - AT23) * (AT34 - AT67) < 0.36; where AT23 is the air gap between the second lens (12) and the third lens (13); 0.35 < (AT34 - AT23) / (AT34 - AT67) < 0.

75.

8. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: -2.3 < f123 / f4567 < -1.8; where f123 is the combined focal length of the first lens (11), the second lens (12), and the third lens (13), and f4567 is the combined focal length of the fourth lens (14), the fifth lens (15), the sixth lens (16), and the seventh lens (17).

9. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 3.2 < (R11 - R12) * (R13 + R14) / TTL < 5.4; where R11 is the radius of curvature of the object side of the sixth lens (16), R12 is the radius of curvature of the image side of the sixth lens (16), R13 is the radius of curvature of the object side of the seventh lens (17), and R14 is the radius of curvature of the image side of the seventh lens (17).

10. The optical lens assembly of a police law enforcement recorder according to claim 1 or 2, characterized in that: The optical lens group satisfies the following conditions: 0.002 < (CT1 - CT2) * (AT34 - AT23) < 0.075; where CT1 is the thickness of the first lens (11) on the optical axis, CT2 is the thickness of the second lens (12) on the optical axis, AT34 is the air gap between the third lens (13) and the fourth lens (14), and AT23 is the air gap between the second lens (12) and the third lens (13).

Images