Day and night confocal vehicle-mounted optical system and camera module applied by same

Abstract

The utility model discloses a day and night confocal vehicle-mounted optical system and a camera module applying the same, mainly comprising six lenses, the object plane side of the first lens is a convex surface, the image plane side of the first lens is a concave surface, the focal power of the first lens is negative, the object plane side of the second lens is a concave surface, the image plane side of the second lens is a convex surface, the focal power of the second lens is positive, the object plane side of the third lens is a concave surface, the image plane side of the third lens is a convex surface, and the focal power of the third lens is negative. The object plane side and the image plane side of the fourth lens are convex surfaces, the focal power of the fourth lens is positive, the object plane side of the fifth lens is a convex surface, the image plane side of the fifth lens is a concave surface, the focal power of the fifth lens is negative, the object plane side and the image plane side of the sixth lens are convex surfaces, the focal power of the sixth lens is positive, the number of the lenses is reasonable, the structure is simple, and the lens aberration is optimized by reasonably distributing the focal power of the lenses. And the imaging quality of an optical system is improved, so that the optical system has the characteristics of no virtual focus at night, ultra-wide angle, small aperture, large aperture, stable performance at temperature and the like, and has stronger competitiveness in the same type of lenses.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and particularly to a day-night confocal vehicle-mounted optical system and an imaging module to which the same is applied. Background Art

[0002] In recent years, with the continuous popularization of intelligent driving, surround-view cameras have been increasingly applied to various vehicles. However, the imaging effects of current surround-view cameras are generally unsatisfactory. Especially under darker conditions such as at night, it is difficult to meet the usage requirements. In terms of appearance, many existing vehicle-mounted lenses have problems of complex structures and large volumes. Therefore, providing a miniaturized day-night confocal vehicle-mounted lens will have greater competitiveness in the market. Summary of the Utility Model

[0003] To overcome the problems of poor imaging effects and complex structures commonly existing in optical systems or imaging modules applied to vehicle-mounted lenses, on the one hand, this application provides a day-night confocal vehicle-mounted lens, which has the characteristics of no defocusing at night, ultra-wide angle, small aperture, large aperture, and stable performance at different temperatures. Among them, the configuration of the large aperture can increase the light input of the optical system and higher imaging quality, making it more competitive among the same type of lenses.

[0004] A day-night confocal vehicle-mounted optical system sequentially includes a first lens, a second lens, 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 plane side of the first lens is convex, and the image plane side is concave, and its optical power is negative;

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

[0007] The object plane side of the third lens is concave, and the image plane side is convex, and its optical power is negative;

[0008] Both the object plane side and the image plane side of the fourth lens are convex, and its optical power is positive;

[0009] The object plane side of the fifth lens is convex, and the image plane side is concave, and its optical power is negative;

[0010] Both the object plane side and the image plane side of the sixth lens are convex, and its optical power is positive.

[0011] Preferably, each lens of this optical system satisfies the following conditions:

[0012] -5.9 < f1 < -4.5;

[0013] 25 < f2 < 35;

[0014] -45 < f3 < -25;

[0015] 5.3 < f4 < 7.7;

[0016] -7.9 < f5 < -6.1;

[0017] 4.9 < f6 < 7.5;

[0018] Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

[0019] Preferably, each lens of the optical system satisfies the following conditions:

[0020] Nd1 > 1.61, Vd1 < 62;

[0021] Nd2 > 1.83, Vd2 > 20.1;

[0022] Nd3 < 1.63, Vd3 > 65;

[0023] Nd4 > 1.45, Vd4 > 50;

[0024] Nd5 > 1.6, Vd5 < 30;

[0025] Nd6 < 1.6, Vd6 > 65;

[0026] Wherein, Nd1 is the refractive index of the first lens, Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe number of the fifth lens, Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens.

[0027] Preferably, the maximum angle CRA at which the chief ray of the full field of view of the optical system is incident on the image plane satisfies: CRA < 21°.

[0028] Preferably, the radius of curvature R1 on the object surface side of the first lens satisfies: 0 < R1 < 25.

[0029] Preferably, the total optical length TTL of the optical system satisfies: TTL ≤ 23 mm.

[0030] Preferably, the fourth lens is a glass aspheric lens.

[0031] Preferably, the F-number and the full field of view FOV of the optical system satisfy: 1.8 ≤ F-number ≤ 2.0, FOV ≥ 140°.

[0032] Preferably, the fifth lens and the sixth lens are adhesively bonded to form a combined lens.

[0033] On the other hand, an embodiment of the present application further provides an imaging module, which at least includes an optical lens, and the above-mentioned day-night confocal vehicle-mounted optical system is installed in the optical lens.

[0034] Compared with the prior art, the beneficial effects of the present application are as follows:

[0035] The present utility model provides a day-night confocal vehicle-mounted optical system and an imaging module to which it is applied. It mainly consists of six lenses. The object side of the first lens is convex, the image side is concave, and the optical power is negative. The object side of the second lens is concave, the image side is convex, and the optical power is positive. The object side of the third lens is concave, the image side is convex, and the optical power is negative. The object side and the image side of the fourth lens are both convex, and the optical power is positive. The object side of the fifth lens is convex, the image side is concave, and the optical power is negative. The object side and the image side of the sixth lens are both convex, and the optical power is positive. The number of lens elements is reasonable and the structure is simple. By reasonably distributing the optical power of the lenses, the lens aberration is optimized, and the imaging quality of the optical system is improved, making it have the characteristics of no defocusing at night, ultra-wide angle, small aperture, large aperture, and stable performance at different temperatures, and having stronger competitiveness among the same type of lenses. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments.

[0037] Figure 1 It is a schematic structural diagram of the optical system or the imaging module according to Embodiment 1 of the present application;

[0038] Figure 2 It is an astigmatism and distortion curve diagram of the optical system or the imaging module according to Embodiment 1 of the present application;

[0039] Figure 3 It is an MTF curve diagram of the optical system or the imaging module according to Embodiment 1 of the present application under visible light;

[0040] Figure 4 It is an MTF curve diagram of the optical system or the imaging module according to Embodiment 1 of the present application under infrared light;

[0041] Figure 5 It is a schematic structural diagram of the optical system or the imaging module according to Embodiment 2 of the present application;

[0042] Figure 6 It is an astigmatism and distortion curve diagram of the optical system or the imaging module according to Embodiment 2 of the present application;

[0043] Figure 7It is the MTF curve graph of the optical system or camera module in Embodiment 2 of the present application under visible light;

[0044] Figure 8 It is the MTF curve graph of the optical system or camera module in Embodiment 2 of the present application under infrared light;

[0045] Figure 9 It is the structural schematic diagram of the optical system or camera module in Embodiment 3 of the present application;

[0046] Figure 10 It is the astigmatism and distortion curve graph of the optical system or camera module in Embodiment 3 of the present application;

[0047] Figure 11 It is the MTF curve graph of the optical system or camera module in Embodiment 3 of the present application under visible light;

[0048] Figure 12 It is the MTF curve graph of the optical system or camera module in Embodiment 3 of the present application under infrared light. Detailed implementation manners

[0049] As Figures 1 - 12 shown, the present application provides a vehicle-mounted relationship system, which is successively composed of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a diaphragm 5, a fifth lens 6, a sixth lens 7, and an infrared filter 8 along the optical axis from the object plane to the image plane 9.

[0050] The object plane side of the first lens is convex, and the image plane side is concave, and its optical power is negative;

[0051] The object plane side of the second lens is concave, and the image plane side is convex, and its optical power is positive;

[0052] The object plane side of the third lens is concave, and the image plane side is convex, and its optical power is negative;

[0053] The object plane side and the image plane side of the fourth lens are both convex, and its optical power is positive;

[0054] The object plane side of the fifth lens is convex, and the image plane side is concave, and its optical power is negative;

[0055] The object plane side and the image plane side of the sixth lens are both convex, and its optical power is positive.

[0056] The optical system of the embodiment of the present application mainly consists of six lenses. The object side of the first lens is convex, the image side is concave, and the optical power is negative. The object side of the second lens is concave, the image side is convex, and the optical power is positive. The object side of the third lens is concave, the image side is convex, and the optical power is negative. The object side and the image side of the fourth lens are both convex, and the optical power is positive. The object side of the fifth lens is convex, the image side is concave, and the optical power is negative. The object side and the image side of the sixth lens are both convex, and the optical power is positive. The number of lens elements is reasonable and the structure is simple. By reasonably distributing the optical power of the lenses, the lens aberration is optimized, and the imaging quality of the optical system is improved, making it have the characteristics of no defocusing at night, ultra-wide angle, small aperture, large aperture, and stable performance under temperature. It has stronger competitiveness among lenses of the same type.

[0057] Further, as a preferred embodiment rather than a limitation of the present utility model, the lenses of the optical system satisfy the following conditions: -5.9 < f1 < -4.5. This design can make the first lens 1 have a large negative optical power, which is beneficial to reducing the astigmatism and field curvature of the optical system.

[0058] Further, as a preferred embodiment rather than a limitation of the present utility model, the lenses of the optical system satisfy the following conditions: 25 < f2 < 35. By restricting the optical power of the second lens 2 within a reasonable range, the spherical aberration of the system is finely adjusted and controlled, thereby effectively improving the imaging quality of the system.

[0059] Further, as a preferred embodiment rather than a limitation of the present utility model, the lenses of the optical system satisfy the following conditions: -45 < f3 < -25. By restricting the optical power of the third lens 3 within a reasonable range, the optical system has the advantages of large wide angle, large aperture, small volume, and excellent temperature characteristics.

[0060] Further, as a preferred embodiment rather than a limitation of the present utility model, the lenses of the optical system satisfy the following conditions: 5.3 < f4 < 7.7. By restricting the optical power of the fourth lens 4 within a reasonable range, the spherical aberration of the system is finely adjusted and controlled, thereby effectively improving the imaging quality of the system.

[0061] Further, as a preferred embodiment rather than a limitation of the present utility model, the lenses of the optical system satisfy the following conditions: -7.9 < f5 < -6.1. By restricting the optical power of the fifth lens 6 within a reasonable range, the configured vehicle surround-view optical system has the advantages of large wide angle, small aperture, large aperture, and excellent temperature characteristics, with a compact structure, being convenient for processing and installation. At the same time, the configuration of the large aperture can increase the light input of the optical system and higher imaging quality.

[0062] Further, as a preferred embodiment rather than a limitation of the present utility model, each lens of the optical system satisfies the following conditions: 4.9 < f6 < 7.5. By constraining the optical power of the sixth lens 7 within a reasonable range, the spherical aberration and field curvature of the system are finely adjusted and controlled, thereby effectively improving the imaging quality of the system.

[0063] Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the fifth lens.

[0064] Further, the refractive index Nd1 and Abbe number Vd1 of the first lens 1 satisfy: Nd1 > 1.61, Vd1 < 62. This design can effectively reduce chromatic aberration and optimize lens aberration, thereby effectively improving the imaging quality of the system.

[0065] Further, the refractive index Nd2 and Abbe number Vd2 of the second lens 2 satisfy: Nd2 > 1.83, Vd2 > 20.1. This design can effectively reduce chromatic aberration and optimize lens aberration, thereby effectively improving the imaging quality of the system.

[0066] Further, the refractive index Nd3 and Abbe number Vd3 of the third lens 3 satisfy: Nd3 < 1.63, Vd3 > 65. This design can effectively reduce chromatic aberration and optimize lens aberration, thereby effectively improving the imaging quality of the system.

[0067] Further, the refractive index Nd4 and Abbe number Vd4 of the fourth lens 4 satisfy: Nd4 > 1.45, Vd4 > 50. This design can effectively reduce chromatic aberration and optimize lens aberration, thereby effectively improving the imaging quality of the system.

[0068] Further, the refractive index Nd5 and Abbe number Vd5 of the fifth lens 6 satisfy: Nd5 > 1.6, Vd5 < 30. This design can effectively reduce chromatic aberration and optimize lens aberration, thereby effectively improving the imaging quality of the system.

[0069] Further, the refractive index Nd6 and Abbe number Vd6 of the sixth lens 7 satisfy: Nd6 < 1.6, Vd6 > 65. This design can effectively reduce chromatic aberration and optimize lens aberration, thereby effectively improving the imaging quality of the system.

[0070] Further, as a preferred embodiment rather than a limitation of the present utility model, the maximum angle CRA at which the chief ray of the full field of view of the optical system is incident on the image plane satisfies: CRA < 21°. This design can make the CRA of the lens more compatible with the CRA of the chip and improve the photosensitive efficiency of the chip.

[0071] Further, as a preferred embodiment rather than a limitation of the present utility model, the radius of curvature R1 of the object surface side of the first lens satisfies: 0 < R1 < 25. By controlling the object surface side of the first lens 1, the total deflection angle of the object surface of the first lens 1 at the edge field of view can be reasonably controlled within a reasonable range.

[0072] Further, as a preferred embodiment rather than a limitation of the present utility model, the total optical length TTL of the optical system satisfies: TTL ≤ 23 mm. This design can reduce the total optical length and effectively miniaturize the lens.

[0073] Further, as a preferred embodiment rather than a limitation of the present utility model, the fourth lens is a glass aspherical lens, and this design is used for aberration correction.

[0074] Further, as a preferred embodiment rather than a limitation of the present utility model, the F-number and FOV of the optical system satisfy: 1.8 ≤ F-number ≤ 2.0, FOV ≥ 140°. The configuration of a large aperture can increase the light input of the optical system and provide higher imaging quality, and the ultra-wide angle satisfies the user's usage requirements.

[0075] Further, as a preferred embodiment rather than a limitation of the present utility model, the fifth lens and the sixth lens are adhesively bonded to form a combined lens; the refractive index Nd5 and Abbe number Vd5 of the fifth lens, and the refractive index Nd6 and Abbe number Vd6 of the sixth lens, satisfy: Nd5 > 1.6, Vd5 < 30; Nd6 < 1.6, Vd6 > 65; this design increases the difference between the refractive index and Abbe number of the lens and can effectively reduce chromatic aberration.

[0076] Specifically, as a preferred embodiment rather than a limitation of the present utility model, as Figures 1 - 3 shown, in Embodiment 1, the focal length f1 of the first lens 1 = -5.698 mm, the focal length f2 of the second lens 2 = 30.819 mm, the focal length f3 of the third lens 3 = -29.237 mm, the focal length f4 of the fourth lens 4 = 6.893 mm, the focal length f5 of the fifth lens 6 = -6.445 mm, the focal length f6 of the sixth lens 7 = 5.294 mm, the total optical length TTL = 22.596 mm, and the surface type, radius of curvature, thickness, and material parameters of each lens are shown in Table 1:

[0077] Table 1: Basic parameters of the optical system in Embodiment 1

[0078]

[0079] In Table 1 above, along the optical axis from the object plane to the image plane 9, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; STO is the position where the aperture stop 5 is located; S10 and S11 correspond to the two surfaces of the fifth lens 6; S11 and S12 correspond to the two surfaces of the sixth lens 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0080] Furthermore, in Table 1, any object side and image side of the fourth lens 4 are aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0081]

[0082] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface profile formula. Table 2 gives the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16 of the aspherical surfaces that can be used in Example 1.

[0083] Table 2: Aspherical-related values of the lens surfaces in Example 1

[0084]

[0085] Figure 2 Shows the astigmatism and distortion curves of the optical imaging lens in Example 1. Astigmatism represents the curvature of the meridional image plane and the sagittal image plane, and distortion represents the distortion magnitude values corresponding to different image heights; Figure 3 and Figure 4 respectively show the MTF curves of the optical imaging lens in Example 1 under visible and infrared light, which represent the MTF values in the meridional direction and sagittal direction at different spatial frequencies and different fields of view. From Figure 2 , Figure 3 and Figure 4 it can be seen that the optical imaging system given in Example 1 can achieve good imaging quality and has higher imaging quality.

[0086] Specifically, as a preferred implementation manner of the present invention rather than a limitation, such as Figures 1 - 3As shown, in this Embodiment 2, the focal length f1 of the first lens 1 is -5.558 mm, the focal length f2 of the second lens 2 is 28.189 mm, the focal length f3 of the third lens 3 is -41.587 mm, the focal length f4 of the fourth lens 4 is 7.506 mm, the focal length f5 of the fifth lens 6 is -7.788 mm, the focal length f6 of the sixth lens 7 is 6.158 mm, and the overall optical length TTL is 22.599 mm. The surface types, radii of curvature, thicknesses, and material parameters of each lens are shown in Table 3:

[0087] Table 3: Basic parameters of the optical system in Embodiment 2

[0088]

[0089] In the above Table 3, along the optical axis from the object plane to the image plane 9, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; STO is the position of the aperture stop 5; S10 and S11 correspond to the two surfaces of the fifth lens 6; S11 and S12 correspond to the two surfaces of the sixth lens 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0090] Furthermore, in Table 3, any object side and image side of the fourth lens 4 are aspherical surfaces. The surface profiles of each aspherical lens can be defined by, but are not limited to, the following aspherical formula:

[0091]

[0092] Among them, x is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula. Table 4 gives the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical surface that can be used in Embodiment 2.

[0093] Table 4: Aspherical surface related values of the lens surfaces in Embodiment 2

[0094]

[0095] Figure 6 Shows the astigmatism and distortion curves of the optical imaging lens in Embodiment 2. Astigmatism represents the curvature of the meridional image plane and the sagittal image plane, and distortion represents the distortion magnitude values corresponding to different image heights; Figure 7 and Figure 8The MTF curves of the optical imaging lens of Embodiment 2 under visible and infrared light are respectively shown, which represent the MTF values in the meridional and sagittal directions of different fields of view at different spatial frequencies. It can be seen from Figure 6 , Figure 7 and Figure 8 that the optical imaging system given in Embodiment 2 can achieve good imaging quality and has higher imaging quality.

[0096] Specifically, as a preferred implementation manner of the present invention rather than a limitation, as shown in Figures 1 - 3 , in this Embodiment 3, the focal length f1 of the first lens 1 is -5.66 mm, the focal length f2 of the second lens 2 is 26.941 mm, the focal length f3 of the third lens 3 is -29.56 mm, the focal length f4 of the fourth lens 4 is 7.462 mm, the focal length f5 of the fifth lens 6 is -7.004 mm, the focal length f6 of the sixth lens 7 is 5.467 mm, and the overall optical length TTL is 22.597 mm. The surface types, radii of curvature, thicknesses and material parameters of each lens are shown in Table 5:

[0097] Table 5: Basic parameters of the optical system of Embodiment 3

[0098]

[0099] In the above Table 5, along the optical axis from the object plane to the image plane 9, OBJ is the object plane; S1 and S2 correspond to the two surfaces of the first lens 1; S3 and S4 correspond to the two surfaces of the second lens 2; S5 and S6 correspond to the two surfaces of the third lens 3; S7 and S8 correspond to the two surfaces of the fourth lens 4; STO is the position of the aperture 5; S10 and S11 correspond to the two surfaces of the fifth lens 6; S11 and S12 correspond to the two surfaces of the sixth lens 7; S13 and S14 correspond to the two surfaces of the filter 8; IMA corresponds to the image plane 9.

[0100] Further, any object side and image side of the fourth lens 4 are aspherical surfaces, and the surface shapes of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0101]

[0102] where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the surface vertex, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the aspherical vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface formula. Table 6 gives the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16 of each aspherical surface that can be used in Embodiment 3.

[0103] Table 6: Aspherical related values of the lens surface in Example 3

[0104]

[0105] Figure 10 The astigmatism and distortion curves of the optical imaging lens in Example 3 are shown. Astigmatism represents the curvature of the meridional image plane and the sagittal image plane, and distortion represents the distortion magnitude values corresponding to different image heights; Figure 11 and Figure 12 respectively show the MTF curves of the optical imaging lens in Example 3 under visible and infrared light, which represent the MTF values in the meridional direction and the sagittal direction at different spatial frequencies and different fields of view. It can be seen from Figure 10 、 Figure 11 and Figure 12 that the optical imaging system given in Example 3 can achieve good imaging quality and has higher imaging quality.

[0106] Furthermore, in Examples 1-3, the basic data is as follows:

[0107] Table 7: Basic data of Examples 1-3

[0108]

[0109] A camera module includes at least an optical lens, and the above-mentioned vehicle day-night confocal optical system is installed in the optical lens. The day-night confocal vehicle optical system of the present invention has the characteristics of ultra-wide angle, small aperture, large aperture, and stable performance at different temperatures, and has stronger competitiveness among the same type of lenses.

[0110] As described above, one or more implementation manners are provided in combination with specific contents, and it is not considered that the specific implementation of the present invention is only limited to these descriptions. Any approximation, similarity to the method, structure, etc. of the present invention, or several technical deductions or substitutions made under the premise of the concept of the present invention should be regarded as the protection scope of the present invention.

Claims

1. A day-night cofocal vehicle-mounted optical system, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens along the optical axis from the object surface to the image surface. It is characterized in that: The object surface side of the first lens is convex, and the image surface side is concave, and its optical power is negative; The object surface side of the second lens is concave, and the image surface side is convex, and its optical power is positive; The object surface side of the third lens is concave, and the image surface side is convex, and its optical power is negative; Both the object surface side and the image surface side of the fourth lens are convex, and its optical power is positive; The object surface side of the fifth lens is convex, and the image surface side is concave, and its optical power is negative; Both the object surface side and the image surface side of the sixth lens are convex, and its optical power is positive.

2. The day-night confocal vehicle-mounted optical system according to claim 1, wherein: The lenses of this optical system satisfy the following conditions: -5.9 < f1 < -4.5; and / or 25 < f2 < 35; and / or -45 < f3 < -25; and / or 5.3 < f4 < 7.7; and / or -7.9 < f5 < -6.1; and / or 4.9<f6<7.5; Among them, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

3. The day-night confocal vehicle-mounted optical system according to claim 1, wherein: The lenses of this optical system satisfy the following conditions: Nd1 > 1.61, Vd1 < 62; and / or Nd2 > 1.83, Vd2 > 20.1; and / or Nd3 < 1.63, Vd3 > 65; and / or Nd4 > 1.45, Vd4 > 50; and / or Nd5 > 1.6, Vd5 < 30; and / or Nd6 < 1.6, Vd6 > 65; Among them, Nd1 is the refractive index of the first lens, Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe number of the fifth lens, Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens.

4. The day-night co-focus vehicle-mounted optical system according to any one of claims 1-3, characterized in that: The maximum angle CRA at which the chief ray of the full field of view of this optical system is incident on the image surface satisfies: CRA < 21°.

5. The day-night co-focus vehicle-mounted optical system according to any one of claims 1-3, characterized in that: The radius of curvature R1 of the object surface side of the first lens satisfies: 0 < R1 < 25.

6. The day-night confocal vehicle-mounted optical system according to any one of claims 1-3, characterized in that: The total optical length TTL of this optical system satisfies: TTL ≤ 23 mm.

7. The day-night confocal vehicle-mounted optical system according to any one of claims 1-3, characterized in that: The fourth lens is a glass aspherical lens.

8. The day-night co-focus vehicle-mounted optical system according to any one of claims 1-3, characterized in that: The F-number and the full field of view FOV of this optical system satisfy: 1.8 ≤ F-number ≤ 2.0, FOV ≥ 140°.

9. The day-night confocal vehicle-mounted optical system according to claim 1, wherein; The fifth lens and the sixth lens are adhesively bonded to form a combined lens.

10. An imaging module, at least comprising an optical lens, characterized in that: The day-night cofocal vehicle-mounted optical system according to any one of claims 1-9 is installed inside the optical lens.

Images