Police law enforcement recorder optical lens group

Abstract

The application discloses a police law enforcement recorder optical lens group, which comprises seven lenses and sequentially comprises 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 expressions: 0.012<|(CT1-CT2) / EFL|<0.071; 1.9<R14 / EFL<4; 0.4<(R7-R8) / TTL<0.6. The application corrects spherical aberration, adjusts the total length and adjusts the light collecting capacity of the front group on the basis of improving imaging quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical lens, and particularly relates to a police law enforcement recorder optical lens group. BACKGROUND

[0002] The law enforcement recorder is also called a scene law enforcement recorder or a single police law enforcement audio and video recorder. It is a portable intelligent device integrating real-time audio and video recording, photographing, and audio recording. It can record the scene during law enforcement in various environments and provide important scene evidence for law enforcement departments such as public security, traffic, urban management, and justice. In recent years, with the continuous progress of technology and the expansion of application scenarios, the police law enforcement recorder market has shown a steady growth trend. In the future, the law enforcement recorder will be more intelligent and data-based, integrating artificial intelligence technology and having automatic recognition and analysis functions such as face recognition and voice-to-text, to improve the efficiency of on-site judgment and post-analysis. At present, the lens length of the law enforcement recorder is generally more than 20 mm, the lens itself has large distortion, and needs to be corrected by post-processing software or more than eight lenses are used to achieve small distortion. The structure is relatively complex. In view of this situation, it is urgent to improve. SUMMARY

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

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

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

[0006] 0.012 < |(CT1-CT2) / EFL| < 0.071; wherein 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 assembly;

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

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

[0009] The present application provides another kind of police law enforcement record appearance optical lens group, including seven lenses, which include from object side to image side: the first lens with negative optical power, the object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis;The second lens with negative optical power, the object side surface of the second lens is concave near the optical axis, and the image side surface of the second lens is concave near the optical axis;The third lens with positive optical power, the object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis;Aperture;The fourth lens with positive optical power, the object side surface of the fourth lens is convex near the optical axis, and the image side surface of the fourth lens is convex near the optical axis;The fifth lens with negative optical power, the object side surface of the fifth lens is concave near the optical axis, and the image side surface of the fifth lens is concave near the optical axis;The sixth lens with positive optical power, the object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is convex near the optical axis;The seventh lens with positive optical power, the object side surface of the seventh lens is convex near the optical axis, and the image side surface of the seventh lens is concave near the optical axis;

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

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

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

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

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

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

[0016] 1.3 < (f7 - f2) / TTL < 1.7; where 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; where CT4 is the thickness on the optical axis of the fourth lens, and CT5 is the thickness on the optical axis of the fifth lens;

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

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

[0020] Preferably, the optical lens set satisfies the following condition: -8 < AT34 * f123 < -4; where AT34 is the air separation of 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 set satisfies the following condition:

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

[0023] 0.3 < (R11 - R12) / TTL < 0.5; where R11 is the radius of curvature of the object side surface of the sixth lens, and R12 is the radius of curvature of the image side surface of the sixth lens.

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

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

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

[0027] Preferably, the optical lens set satisfies the following condition:

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

[0029] 0.026 < (AT34-AT23)*(AT34-AT67) < 0.36; wherein AT23 is the air separation of the second lens and the third lens;

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

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

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

[0033] Preferably, the optical lens set satisfies the following condition: 0.002 < (CT1-CT2)*(AT34-AT23) < 0.075; wherein 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 separation of the third lens and the fourth lens, and AT23 is the air separation of the second lens and the third lens.

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

[0035] 1. The condition 0.012 < |(CT1-CT2) / EFL| < 0.071 is met, which helps to control the total length of the optical lens set;

[0036] 2. The conditions 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 are met, which helps to reduce the field curvature and chromatic aberration of the optical lens set;

[0037] 3. The condition 0.04 < |(AT34-AT23) / EFL| < 0.23 is met, which helps to control the total length of the optical lens set to increase the use occasions;

[0038] 4. The conditions 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 are met, which helps to control the total length of the optical lens set;

[0039] 5. The condition -8 < AT34*f123 < -4 is met, which can appropriately adjust the refractive power of the front lens group of the optical lens set and balance the configuration of the third lens and the fourth lens;

[0040] 6. The conditions 0.12 < (AT34-AT67) / EFL < 0.31, 0.026 < (AT34-AT23)*(AT34-AT67) < 0.36, 0.35 < (AT34-AT23) / (AT34-AT67) < 0.75 are met, which avoids the relative spacing distance of the lenses being too large;

[0041] 7. The condition 0.002 < (CT1-CT2)*(AT34-AT23) < 0.075 is met, which can adjust the lens distribution of the optical lens set, helps to adjust the overall distribution and form a wide view angle configuration, and improves the imaging quality. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 The structure diagram of the optical lens set of the embodiment 1.

[0043] Figure 2A spherical aberration map for the optical lens assembly of Example 1.

[0044] Figure 3 A field curvature map for the optical lens assembly of Example 1.

[0045] Figure 4 An optical distortion map for the optical lens assembly of Example 1.

[0046] Figure 5 A longitudinal chromatic aberration for the optical lens assembly of Example 1.

[0047] Figure 6 A structural schematic diagram of an optical lens assembly of Example 2.

[0048] Figure 7 A spherical aberration map for the optical lens assembly of Example 2.

[0049] Figure 8 A field curvature map for the optical lens assembly of Example 2.

[0050] Figure 9 An optical distortion map for the optical lens assembly of Example 2.

[0051] Figure 10 A longitudinal chromatic aberration for the optical lens assembly of Example 2.

[0052] Figure 11 A structural schematic diagram of an optical lens assembly of Example 3.

[0053] Figure 12 A spherical aberration map for the optical lens assembly of Example 3.

[0054] Figure 13 A field curvature map for the optical lens assembly of Example 3.

[0055] Figure 14 An optical distortion map for the optical lens assembly of Example 3.

[0056] Figure 15 A longitudinal chromatic aberration for the optical lens assembly of Example 3.

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

[0058] The application will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the application are not limited thereto.

[0059] The application discloses the application solves the problem by the following technical solutions:

[0060] An optical lens assembly for police law enforcement recorders comprises seven lenses, which sequentially comprise, from the object side to the image side: a first lens 11 with negative refractive 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 negative refractive 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 positive refractive 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 positive refractive 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 negative refractive 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 positive refractive 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 positive refractive 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 arranged between the seventh lens 17 and the image side and close to one side of the seventh lens 17.

[0061] The optical lens assembly satisfies the following conditional expression:

[0062] 0.012<|(CT1-CT2) / EFL|<0.071; wherein 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 assembly; meeting the conditional expression can control the thickness difference of the first lens 11 and the second lens 12 on the optical axis, which is helpful to control the total length of the optical lens assembly;

[0063] 1.9<R14 / EFL<4; wherein R14 is the curvature radius of the image side surface of the seventh lens 17; meeting the conditional expression can appropriately control the curvature radius of the image side surface of the seventh lens 17, which is conducive to reducing the field curvature aberration and correction chromatic aberration of the optical lens assembly;

[0064] 0.4<(R7-R8) / TTL<0.6; wherein R7 is the curvature radius of the object side surface of the fourth lens 14, R8 is the curvature radius of the image side surface of the fourth lens 14, and TTL is the total lens length. Meeting the conditional expression can appropriately control the curvature radius of the fourth lens 14, which is conducive to reducing the field curvature aberration and correction chromatic aberration of the optical lens assembly.

[0065] The application provides another optical lens group for police law enforcement recorders, which comprises seven lenses, and sequentially comprises, from the object side to the image side: a first lens 11 with negative focal 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 negative focal 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 positive focal 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 positive focal 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 negative focal 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 positive focal 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; and a seventh lens 17 with positive focal 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 arranged between the seventh lens 17 and the image side and close to one side of the seventh lens 17.

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

[0067] 0.04<|(AT34-AT23) / EFL|<0.23; wherein AT34 is the air interval of the third lens 13 and the fourth lens 14, AT23 is the air interval of the second lens 12 and the third lens 13, and EFL is the effective focal length of the optical lens group; the conditional expression is met, the arrangement of the second lens 12, the third lens 13 and the fourth lens 14 is balanced, so as to facilitate the control of the total length of the lens and increase the use occasions.

[0068] 1.9<R14 / EFL<4; wherein R14 is the curvature radius of the image side surface of the seventh lens 17; the conditional expression is met, the curvature radius of the image side surface of the seventh lens 17 is appropriately controlled, and the optical lens group is beneficial to reduce the field curvature aberration and correct the chromatic aberration.

[0069] 0.3<(f6-f2) / TTL<0.5; wherein 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. The conditional expression is met, which is helpful to control the focal length of the second lens 12 and the sixth lens 16 and maintain a proper proportion with the total length of the system.

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

[0071] 1.6 < AT67 * TTL < 3.4; wherein AT67 is the distance on the optical axis from the image side surface of the sixth lens 16 to the object side surface of the seventh lens 17; meeting the conditional expression, the configuration of the sixth lens 16 and the seventh lens 17 can be balanced, and the total length of the system can be effectively controlled;

[0072] 1.3 < (f7 - f2) / TTL < 1.7; wherein f7 is the focal length of the seventh lens 17, and f2 is the focal length of the second lens 12; meeting the conditional expression, the focal length of the second lens 12 and the seventh lens 17 can be controlled to maintain a proper ratio with the total length of the system;

[0073] 0.8 < (CT4 + CT5) / EFL < 1; wherein 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; meeting the conditional expression, the thicknesses of the fourth lens 14 and the fifth lens 15 on the optical axis can be controlled, and the total length of the optical lens group can be controlled;

[0074] 0.007 < (AT34 - AT67) * (CT1 - CT2) < 0.101; wherein AT34 is the air interval of 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; meeting the conditional expression, the total length of the optical lens group can be controlled, and the miniaturization of the optical lens group is facilitated.

[0075] Preferably, the optical lens group meets the following condition: 3 < (AT34 - AT67) / (CT1 - CT2) < 10.5; wherein AT34 is the air interval of the third lens 13 and the fourth lens 14, AT67 is the distance on the optical axis from the image side surface of the sixth lens 16 to the object side surface 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; meeting the conditional expression, the total length of the optical lens group can be controlled, and the miniaturization of the optical lens group is facilitated.

[0076] Preferably, the optical lens group meets the following condition: -8 < AT34 * f123 < -4; wherein AT34 is the air interval of 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 the conditional expression, the refractive power of the front lens group of the optical lens group can be appropriately adjusted, and the configuration of the third lens 13 and the fourth lens 14 can be balanced.

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

[0078] 1.2 < (R4-R3) / TTL < 1.5; wherein R4 is the curvature radius of the image side surface of the second lens 12, and R3 is the curvature radius of the object side surface of the second lens 12; meeting the conditional expression, the curvature radius of the second lens 12 can be appropriately controlled, which is conducive to reducing the field curvature aberration and correcting the chromatic aberration of the optical lens group.

[0079] 0.3 < (R11-R12) / TTL < 0.5; wherein R11 is the curvature radius of the object side surface of the sixth lens 16, and R12 is the curvature radius of the image side surface of the sixth lens 16; meeting the conditional expression, the curvature radius of the sixth lens 16 can be appropriately controlled, which is conducive to reducing the field curvature aberration and correcting the chromatic aberration of the optical lens group.

[0080] 0.4 < (R13+R14) / TTL < 0.9; wherein R13 is the curvature radius of the object side surface of the seventh lens 17, and R14 is the curvature radius of the image side surface of the seventh lens 17; meeting the conditional expression, the curvature radius of the seventh lens 17 can be appropriately controlled, which is conducive to reducing the field curvature aberration and correcting the chromatic aberration of the optical lens group.

[0081] 0.6 < R4 / (nd1*nd3) < 0.78; wherein nd1 is the refractive index of the first lens 11, and nd3 is the refractive index of the third lens 13; meeting the conditional expression, the material use flexibility can be increased, the lens material can be adjusted, which is helpful for correcting chromatic aberration and improving imaging quality.

[0082] 432 < (Vd1*Vd3) / R4 < 555; wherein Vd1 is the dispersion coefficient of the first lens 11, and Vd3 is the dispersion coefficient of the third lens 13; meeting the conditional expression, the material use flexibility can be increased, and better chromatic aberration balancing force can be achieved, which balances the material configuration of the first lens 11 and the third lens 13 to correct chromatic aberration and improve imaging quality.

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

[0084] 0.12 < (AT34-AT67) / EFL < 0.31; wherein 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 surface of the sixth lens 16 to the object side surface of the seventh lens 17; meeting the conditional expression, the spatial configuration of the third lens 13, the fourth lens 14, the sixth lens 16 and the seventh lens 17 can be balanced to avoid too large relative interval distance.

[0085] 0.026 < (AT34 - AT23) * (AT34 - AT67) < 0.36, 0.35 < (AT34 - AT23) / (AT34 - AT67) < 0.75, wherein AT23 is the air separation between the second lens 12 and the third lens 13; meeting the conditional expression, the spatial configuration of the third lens 13, the fourth lens 14, the sixth lens 16 and the seventh lens 17 can be balanced to avoid the relative separation distance being too large.

[0086] Preferably, the optical lens group satisfies the following condition: -2.3 < f123 / f4567 < -1.8; wherein 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 the conditional expression, the refractive power of the front and rear mirror groups of the optical lens group can be appropriately distributed, so that the front mirror group has appropriate refractive power, and the light passing through the aperture is not too divergent, and the burden of the positive refractive power of the rear mirror group is increased.

[0087] Preferably, the optical lens group satisfies the following condition: 3.2 < (R11 - R12) * (R13 + R14) / TTL < 5.4; wherein R11 is the curvature radius of the object side surface of the sixth lens 16, R12 is the curvature radius of the image side surface of the sixth lens 16, R13 is the curvature radius of the object side surface of the seventh lens 17, and R14 is the curvature radius of the image side surface of the seventh lens 17. Meeting the conditional expression, the curvature radii of the sixth lens 16 and the seventh lens 17 can be appropriately controlled, which is beneficial to reduce the field curvature aberration and correct 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; wherein 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 separation between the third lens 13 and the fourth lens 14, and AT23 is the air separation between the second lens 12 and the third lens 13. Meeting the conditional expression, the lens distribution of the optical lens group can be adjusted, which is helpful to adjust the overall distribution and form a wide viewing angle configuration to improve the imaging quality.

[0089] In the embodiment 1, as shown in Table 1-1, 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. Figures 1-5 The parameters of the lenses in the embodiment 1 are shown in Table 1-2.1 and Table 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 equations for the aspherical surfaces of the above lenses are expressed as follows:

[0098]

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

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

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

[0102] K: Conical coefficient;

[0103] A i : The i-th order aspherical coefficient.

[0104] Example 2, as Figures 6-10 As shown, the first lens 11 and the third lens 13 are made of glass, while 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. The relevant parameters of each lens are shown in Table 2-1, and 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 equations for the aspherical surfaces of the above lenses are expressed as follows:

[0113]

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

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

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

[0117] K: Conical coefficient;

[0118] A i : The i-th order aspherical coefficient.

[0119] Example 3, as Figures 11-15 As shown, the first lens 11 and the third lens 13 are made of glass, while 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. The relevant parameters of each lens are shown in Table 3-1, and 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 equations for the aspherical surfaces of the above lenses are expressed as follows:

[0128]

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

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

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

[0132] K: Conical coefficient;

[0133] A i: i-th aspherical surface coefficient

[0134] The above embodiments only express three kinds of embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A law enforcement recording device optical lens assembly, characterized in that, consisting of seven lenses, which include in order from the object side to the image side: a first lens (11) with negative refractive power, the object side surface of the first lens (11) is convex near the optical axis, the image side surface of the first lens (11) is concave near the optical axis; a second lens (12) with negative refractive power, the object side surface of the second lens (12) is concave near the optical axis, the image side surface of the second lens (12) is concave near the optical axis; a third lens (13) with positive refractive power, the object side surface of the third lens (13) is convex near the optical axis, the image side surface of the third lens (13) is convex near the optical axis; an aperture (10); a fourth lens (14) with positive refractive power, the object side surface of the fourth lens (14) is convex near the optical axis, the image side surface of the fourth lens (14) is convex near the optical axis; a fifth lens (15) with negative refractive power, the object side surface of the fifth lens (15) is concave near the optical axis, the image side surface of the fifth lens (15) is concave near the optical axis; a sixth lens (16) with positive refractive power, the object side surface of the sixth lens (16) is convex near the optical axis, the image side surface of the sixth lens (16) is convex near the optical axis; a seventh lens (17) with positive refractive power, the object side surface of the seventh lens (17) is convex near the optical axis, the image side surface of the seventh lens (17) is concave near the optical axis; the optical lens group satisfies the following conditional expressions: 0.012<|(CT1-CT2) / EFL|<0.071; wherein 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; wherein R14 is the radius of curvature of the image side surface of the seventh lens (17); 0.4<(R7-R8) / TTL<0.6; wherein 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; 1.6<AT67*TTL<3.4; wherein AT67 is the distance from the image side surface of the sixth lens (16) to the object side surface of the seventh lens (17) on the optical axis; 1.3<(f7-f2) / TTL<1.7; wherein 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; wherein 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; wherein AT34 is the air gap of 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.

2. A law enforcement recording device optical lens group characterized by, consisting of seven lenses, which include in order from the object side to the image side: a first lens (11) with negative refractive power, a convex surface of the first lens (11) near the optical axis on the object side, a concave surface of the first lens (11) near the optical axis on the image side; a second lens (12) with negative refractive power, a concave surface of the second lens (12) near the optical axis on the object side, a concave surface of the second lens (12) near the optical axis on the image side; a third lens (13) with positive refractive power, a convex surface of the third lens (13) near the optical axis on the object side, a convex surface of the third lens (13) near the optical axis on the image side; an aperture (10); a fourth lens (14) with positive refractive power, a convex surface of the fourth lens (14) near the optical axis on the object side, a convex surface of the fourth lens (14) near the optical axis on the image side; a fifth lens (15) with negative refractive power, a concave surface of the fifth lens (15) near the optical axis on the object side, a concave surface of the fifth lens (15) near the optical axis on the image side; a sixth lens (16) with positive refractive power, a convex surface of the sixth lens (16) near the optical axis on the object side, a convex surface of the sixth lens (16) near the optical axis on the image side; a seventh lens (17) with positive refractive power, a convex surface of the seventh lens (17) near the optical axis on the object side, a concave surface of the seventh lens (17) near the optical axis on the image side; the optical lens set satisfies the following conditional expression: 0.04<|(AT34-AT23) / EFL|<0.23; wherein AT34 is the air separation of the third lens (13) and the fourth lens (14), AT23 is the air separation of the second lens (12) and the third lens (13), and EFL is the effective focal length of the optical lens set; 1.9<R14 / EFL<4; wherein R14 is the radius of curvature of the image side of the seventh lens (17); 0.3<(f6-f2) / TTL<0.5; wherein 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; 1.6<AT67*TTL<3.4; wherein 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; wherein 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; wherein 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; wherein AT34 is the air separation of 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.

3. The optical lens assembly of claim 1 or 2, wherein, The optical lens set satisfies the following condition: 3 < (AT34-AT67) / (CT1-CT2) < 10.5; wherein, AT34 is the air separation of 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).

4. The optical lens assembly of claim 1 or 2, wherein, The optical lens set satisfies the following condition: -8 < AT34*f123 < -4; wherein, AT34 is the air separation of 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).

5. The optical lens assembly of claim 1 or 2, wherein, The optical lens set satisfies the following condition: 1.2 < (R4-R3) / TTL < 1.5; wherein, 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; wherein, 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; wherein, 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; wherein, 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; wherein, Vd1 is the dispersion coefficient of the first lens (11), and Vd3 is the dispersion coefficient of the third lens (13).

6. The optical lens assembly for a police law enforcement recording apparatus according to claim 1 or 2, wherein, The optical lens set satisfies the following condition: 0.12 < (AT34-AT67) / EFL < 0.31; wherein, AT34 is the air separation of 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; wherein, AT23 is the air separation of the second lens (12) and the third lens (13); 0.35 < (AT34-AT23) / (AT34-AT67) < 0.

75.

7. The optical lens assembly of claim 1 or 2, wherein, The optical lens set satisfies the following condition: -2.3 < f123 / f4567 < -1.8; wherein, 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).

8. The optical lens assembly for a police law enforcement recording apparatus according to claim 1 or 2, wherein, The optical lens set satisfies the following condition: 3.2 < (R11-R12)*(R13+R14) / TTL < 5.4; where R11 is the radius of curvature of the object side surface of the sixth lens (16), R12 is the radius of curvature of the image side surface of the sixth lens (16), R13 is the radius of curvature of the object side surface of the seventh lens (17), and R14 is the radius of curvature of the image side surface of the seventh lens (17).

9. The optical lens assembly of claim 1 or 2, wherein, The optical lens set 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 separation of the third lens (13) and the fourth lens (14), and AT23 is the air separation of the second lens (12) and the third lens (13).

Images