Optical imaging lens and electronic rearview mirror

Abstract

The utility model discloses an optical imaging lens and an electronic rearview mirror. A first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens are sequentially arranged from an object side to an image side along an optical axis. The first lens has negative diopter, the object side surface is a convex surface and the image side surface is a concave surface; the second lens has positive diopter, the object side surface is a convex surface and the image side surface is a plane; the third lens has negative diopter, the object side surface is a concave surface and the image side surface is a concave surface; the fourth lens has positive diopter, the object side surface is a convex surface and the image side surface is a convex surface; the sixth lens has negative diopter, the object side surface is a concave surface, and the image side surface is a convex surface. The fifth lens and the sixth lens are glued to form a combined lens with the diopter larger than zero. F1 is the focal length of the fifth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and (dn / dt) 5 and (dn / dt) 6 are refractive index temperature coefficients of the fifth lens and the sixth lens at 0-20 DEG C respectively. The fifth lens and the sixth lens meet the following conditions:-10 * 10 <-4 > mm / DEG C lt; f5 * (dn / dt) 5 + f6 * (dn / dt) 6lt; and 10 * 10 <-4 > mm / DEG C.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to an optical imaging lens and an electronic rearview mirror. Background Art

[0002] With the development of technology, the functions and applications of in-vehicle optical systems have expanded, and in-vehicle electronic rearview mirrors have emerged. Compared with traditional rearview mirrors, electronic rearview mirrors are smaller in volume, which is beneficial to reducing air resistance during vehicle driving. At the same time, electronic rearview mirrors are more flexible, have a more flexible viewing angle, and can effectively reduce the blind spot of vision.

[0003] However, in the existing optical systems of electronic rearview mirrors, there are generally problems such as too many lenses, too large lens TTL, large volume, resulting in too high overall cost of the lens. The lens has a large temperature drift. When the temperature perturbation is too large, the imaging quality is affected. The lens has a small field of view angle and a limited imaging range. The light transmission is small, so that the amount of incident light is too small, affecting the imaging effect. Summary of the Utility Model

[0004] Embodiments of the utility model provide an optical imaging lens and an electronic rearview mirror to solve the problems mentioned in the background art.

[0005] To achieve the above object, the embodiments of the utility model adopt the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides an optical imaging lens, which includes a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, and a sixth lens sequentially arranged along an optical axis from the object side to the image side. Each of the first lens to the sixth lens includes an object side facing the object side and allowing imaging light to pass through and an image side facing the image side and allowing imaging light to pass through.

[0007] The first lens has a negative refractive power. The object side of the first lens is a convex surface, and the image side is a concave surface. The second lens has a positive refractive power. The object side of the second lens is a convex surface, and the image side is a flat surface. The third lens has a negative refractive power. The object side of the third lens is a concave surface, and the image side is a concave surface. The fourth lens has a positive refractive power. The object side of the fourth lens is a convex surface, and the image side is a convex surface. The fifth lens has a positive refractive power. The object side of the fifth lens is a convex surface, and the image side is a convex surface. The sixth lens has a negative refractive power. The object side of the sixth lens is a concave surface, and the image side is a convex surface. The image side of the fifth lens and the object side of the sixth lens are adhesively bonded to form a combined lens, and the refractive power of the combined lens is greater than zero. And the fifth lens and the sixth lens satisfy:

[0008] -10×10-4mm / ℃ <f5*(dn / dt)5+f6*(dn / dt)6<10×10-4mm / ℃,其中,f5表示第五透镜的焦距,f6表示第六透镜的焦距,(dn / dt)5表示第五透镜在0~20℃时的折射率温度系数,(dn / dt)6表示第六透镜在0~20℃时折射率温度系数。

[0009] In some embodiments, the temperature coefficient of refractive index of the fifth lens is less than zero.

[0010] In some embodiments, the first lens has an abrasiveness of ≤111 and a hardness of ≥650*10 7 Pa material, and the first lens is coated with a waterproof film.

[0011] In some embodiments, the material refractive index Nd1 and the material Abbe constant Vd1 of the first lens satisfy: 1.70 <Nd1<2.00,25<Vd1<55。

[0012] In some embodiments, the material refractive index Nd1 and the material Abbe constant Vd1 of the second lens satisfy: 1.70 <Nd1<2.20,25<Vd1<55。

[0013] In some embodiments, the material refractive index Nd1 and the material Abbe constant Vd1 of the third lens satisfy: 1.70 <Nd1<2.00,25<Vd1<55。

[0014] In some embodiments, the material refractive index Nd1 and the material Abbe constant Vd1 of the fourth lens satisfy: 1.70 <Nd1<2.00,25<Vd1<60。

[0015] In some embodiments, the refractive index Nd1 and the Abbe constant Vd1 of the material of the fifth lens satisfy: 1.4 <Nd1<1.65,60<Vd1<95。

[0016] In some embodiments, the refractive index Nd1 and the Abbe constant Vd1 of the sixth lens satisfy: 1.70 <Nd1<2.00,25<Vd1<55。

[0017] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy:

[0018] -10 <f1<-2;

[0019] 1 <f2<10;

[0020] -10 <f3<-2;

[0021] 1 <f4<10;

[0022] 1 < f5 < 10;

[0023] -12 < f6 < -2.

[0024] 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.

[0025] In some embodiments, the effective focal length f of the optical imaging lens satisfies: 5.0 mm ≤ f ≤ 6.0 mm. The aperture value F# of the optical imaging lens satisfies: F# ≤ 1.8. The overall optical length TTL of the optical imaging lens satisfies: TTL ≤ 23.0 mm. The field of view FOV of the optical imaging lens satisfies: 70.0° mm ≤ FOV ≤ 85.0°. The image height h of the optical imaging lens satisfies: 7.0 mm ≤ h ≤ 7.8 mm.

[0026] In some embodiments, the optical imaging lens further includes a sensor. The sensor is adaptively arranged with each lens, and the size of the sensor is 1 / 2.44 inches.

[0027] In some embodiments, the optical imaging lens further includes a seventh lens. The seventh lens is a plano lens and is located between the sixth lens and the sensor.

[0028] In a second aspect, the present application further provides an electronic rearview mirror, and the electronic rearview mirror includes any one of the above optical imaging lenses. Description of the Drawings

[0029] Figure 1 It is a schematic diagram of an optical imaging lens provided by an embodiment of the present application;

[0030] Figure 2 It is an MTF curve graph of an optical imaging lens provided by Embodiment 1 of the present application;

[0031] Figure 3 It is a vertical chromatic aberration curve graph of an optical imaging lens provided by Embodiment 1 of the present application;

[0032] Figure 4 It is a focal length offset curve graph of an optical imaging lens provided by Embodiment 1 of the present application;

[0033] Figure 5 It is a field curvature curve graph of an optical imaging lens provided by Embodiment 1 of the present application;

[0034] Figure 6 It is a distortion graph of an optical imaging lens provided by Embodiment 1 of the present application;

[0035] Figure 7MTF curve graph of an optical imaging lens provided in Embodiment 1 of the present application at -40°C;

[0036] Figure 8 MTF curve graph of an optical imaging lens provided in Embodiment 1 of the present application at 105°C;

[0037] Figure 9 MTF curve graph of an optical imaging lens provided in Embodiment 2 of the present application;

[0038] Figure 10 Vertical chromatic aberration curve graph of an optical imaging lens provided in Embodiment 2 of the present application;

[0039] Figure 11 Focal length offset curve graph of an optical imaging lens provided in Embodiment 2 of the present application;

[0040] Figure 12 Field curvature curve graph of an optical imaging lens provided in Embodiment 2 of the present application;

[0041] Figure 13 Distortion graph of an optical imaging lens provided in Embodiment 2 of the present application;

[0042] Figure 14 MTF curve graph of an optical imaging lens provided in Embodiment 3 of the present application;

[0043] Figure 15 Vertical chromatic aberration curve graph of an optical imaging lens provided in Embodiment 3 of the present application;

[0044] Figure 16 Focal length offset curve graph of an optical imaging lens provided in Embodiment 3 of the present application;

[0045] Figure 17 Field curvature curve graph of an optical imaging lens provided in Embodiment 3 of the present application;

[0046] Figure 18 Distortion graph of an optical imaging lens provided in Embodiment 3 of the present application.

[0047] Reference numerals:

[0048] 101 - First lens; 102 - Second lens; 103 - Third lens; 104 - Fourth lens; 105 - Fifth lens; 106 - Sixth lens; 107 - Seventh lens;

[0049] 2 - Diaphragm. Detailed implementation manners

[0050] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0051] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0052] The terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0053] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0054] In the description of this specification, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0055] As Figure 1 shown, the present application provides an optical imaging lens. A first lens 101, a second lens 102, a third lens 103, a diaphragm 2, a fourth lens 104, a fifth lens 105, and a sixth lens 106 are sequentially arranged along an optical axis from the object side to the image side. Each of the first lens 101 to the sixth lens 106 includes an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through.

[0056] The first lens 101 has a negative refractive power. The object side surface of the first lens 101 is a convex surface, and the image side surface is a concave surface;

[0057] The second lens 102 has a positive refractive power. The object side surface of the second lens 102 is a convex surface, and the image side surface is a flat surface;

[0058] The third lens 103 has a negative refractive power. The object side surface of the third lens 103 is a concave surface, and the image side surface is a concave surface;

[0059] The fourth lens 104 has a positive refractive power. The object side surface of the fourth lens 104 is convex, and the image side surface is convex.

[0060] The fifth lens 105 has a positive refractive power. The object side surface of the fifth lens 105 is convex, and the image side surface is convex.

[0061] The sixth lens 106 has a negative refractive power. The object side surface of the sixth lens 106 is concave, and the image side surface is convex.

[0062] Among them, the image side surface of the fifth lens 105 and the object side surface of the sixth lens 106 are cemented to form a combined lens, and the refractive power of the combined lens formed by the fifth lens 105 and the sixth lens 106 is greater than zero.

[0063] Furthermore, the fifth lens 105 and the sixth lens 106 satisfy:

[0064] -10×10-4mm / ℃ < f5*(dn / dt)5 + f6*(dn / dt)6 < 10×10-4mm / ℃;

[0065] Among them, f5 represents the focal length of the fifth lens 105, f6 represents the focal length of the sixth lens 106, (dn / dt)5 represents the refractive index temperature coefficient of the fifth lens 105 at 0 to 20°C, and (dn / dt)6 represents the refractive index temperature coefficient of the sixth lens 106 at 0 to 20°C.

[0066] In the above expression, f5*(dn / dt)5 + f6*(dn / dt)6 calculates the sum of the effects of the refractive index changes of the fifth lens 105 and the sixth lens 106 due to temperature changes on their focal lengths. Multiplying by the focal length is because the change in the focal length is proportional to the change in the refractive index.

[0067] The total change in the focal lengths of the fifth lens 105 and the sixth lens 106 due to temperature changes should be within a very small range, that is, between ±10×10^-4mm / ℃, that is, when the temperature rises or falls by 1°C, the change in the focal length should be less than or equal to ±0.0001mm.

[0068] In this way, the influence of temperature fluctuations on the imaging quality of the optical system can be reduced, and when the temperature fluctuates, the lens can still maintain good imaging performance.

[0069] In some embodiments of the present application, the fifth lens 105 provided by the present application has a positive refractive power. The object side surface of the fifth lens 105 is a convex surface, and the image side surface is a convex surface. Based on this, in some embodiments, the refractive index temperature coefficient of the fifth lens 105 is less than zero, that is, the refractive index of the fifth lens 105 decreases as the temperature increases. The fifth lens 105 can not only correct the chromatic aberration of the lens, but also offset the influence of temperature change on the back focal shift of the lens to ensure that the lens operates normally at -40°C to 105°C.

[0070] In some embodiments of the present application, the first lens 101 is made of a material with a wear rate ≤ 111 and a hardness

[0071] ≥ 650×107 Pa, and the first lens 101 is coated with a waterproof film. The high material hardness can ensure that the first lens 101 has good impact resistance. Coating the first lens 101 with a waterproof film can improve the anti-fouling and hydrophobic ability of the first lens 101 and ensure the imaging effect.

[0072] In some embodiments of the present application, the refractive index Nd1 of the material of the first lens 101 and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 55.

[0073] In some embodiments of the present application, the refractive index Nd1 of the material of the second lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.20, 25 < Vd1 < 55.

[0074] In some embodiments of the present application, the refractive index Nd1 of the material of the third lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 55.

[0075] In some embodiments of the present application, the refractive index Nd1 of the material of the fourth lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 60.

[0076] In some embodiments of the present application, the refractive index Nd1 of the material of the fifth lens and the Abbe number Vd1 of the material satisfy: 1.4 < Nd1 < 1.65, 60 < Vd1 < 95.

[0077] In some embodiments of the present application, the refractive index Nd1 of the material of the sixth lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 55.

[0078] Further, in some embodiments of the present application, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, and the sixth lens 106 provided by the present application further satisfy:

[0079] -10 < f1 < -2;

[0080] 1 < f2 < 10;

[0081] -10 < f3 < -2;

[0082] 1 < f4 < 10;

[0083] 1 < f5 < 10;

[0084] -12 < f6 < -2;

[0085] 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.

[0086] Furthermore, the effective focal length f of the optical imaging lens satisfies: 5.0 mm ≤ f ≤ 6.0 mm.

[0087] Furthermore, the aperture value F# of the optical imaging lens satisfies: F# ≤ 1.8 mm.

[0088] Furthermore, the overall optical length TTL of the optical imaging lens satisfies: TTL ≤ 23.0 mm.

[0089] Furthermore, the field of view FOV of the optical imaging lens satisfies: 70.0° ≤ FOV ≤ 85.0°.

[0090] Furthermore, the image height h of the optical imaging lens satisfies: 7.0 mm ≤ h ≤ 7.8 mm.

[0091] Furthermore, the optical imaging lens provided in this application further includes a sensor, which is adaptively arranged with each lens, and the size of the sensor is 1 / 2.44 inches.

[0092] Furthermore, the optical imaging lens provided in this application further includes a first lens 101. The seventh lens is a plano-convex lens, and the seventh lens 107 is located between the sixth lens 106 and the sensor.

[0093] Hereinafter, the optical imaging lens of this application will be described in detail with specific embodiments.

[0094] Embodiment 1

[0095] As Figure 1As shown, an optical imaging lens sequentially arranges a first lens 101, a second lens 102, a third lens 103, a diaphragm 2, a fourth lens 104, a fifth lens 105, and a sixth lens 106 along an optical axis from the object side to the image side. Each of the first lens 101 to the sixth lens 106 includes an object side surface facing the object side and allowing imaging light to pass through, and an image side surface facing the image side and allowing imaging light to pass through.

[0096] The first lens 101 has a negative refractive power. The object side surface of the first lens 101 is convex, and the image side surface is concave.

[0097] The second lens 102 has a positive refractive power. The object side surface of the second lens 102 is convex, and the image side surface is flat.

[0098] The third lens 103 has a negative refractive power. The object side surface of the third lens 103 is concave, and the image side surface is concave.

[0099] The fourth lens 104 has a positive refractive power. The object side surface of the fourth lens 104 is convex, and the image side surface is convex.

[0100] The fifth lens 105 has a positive refractive power. The object side surface of the fifth lens 105 is convex, and the image side surface is convex.

[0101] The sixth lens 106 has a negative refractive power. The object side surface of the sixth lens 106 is concave, and the image side surface is convex.

[0102] Among them, the image side surface of the fifth lens 105 and the object side surface of the sixth lens 106 are adhesively bonded to form a combined lens, and the refractive power of the combined lens formed by the fifth lens 105 and the sixth lens 106 is greater than zero.

[0103] Furthermore, the fifth lens 105 and the sixth lens 106 satisfy:

[0104] -10×10-4mm / ℃ < f5*(dn / dt)5 + f6*(dn / dt)6 < 10×10-4mm / ℃;

[0105] Among them, f5 represents the focal length of the fifth lens 105, f6 represents the focal length of the sixth lens 106, (dn / dt)5 represents the refractive index temperature coefficient of the fifth lens 105 at 0 to 20 °C, and (dn / dt)6 represents the refractive index temperature coefficient of the sixth lens 106 at 0 to 20 °C.

[0106] In the above expression, f5*(dn / dt)5 + f6*(dn / dt)6 calculates the sum of the effects of the refractive index changes of the fifth lens 105 and the sixth lens 106 due to temperature changes on their focal lengths. Multiplying by the focal length is because the change in focal length is proportional to the change in refractive index.

[0107] The total focal length change of the fifth lens 105 and the sixth lens 106 due to temperature change should be within a very small range, that is, between ±10×10^-4mm / °C. In other words, the focal length change should be less than or equal to ±0.0001mm for every 1°C increase or decrease in temperature.

[0108] In some embodiments of the present application, the fifth lens element 105 provided herein has positive refractive power, with both the object-side surface and the image-side surface of the fifth lens element 105 being convex. Based on this, in some embodiments, the temperature coefficient of the refractive index of the fifth lens element 105 is less than zero, meaning that the refractive index of the fifth lens element 105 decreases with increasing temperature. This allows the fifth lens element 105 to not only correct chromatic aberration but also offset the effects of temperature changes on lens back focus shift, ensuring proper operation of the lens in temperatures between -40°C and 105°C.

[0109] In some embodiments of the present application, the first lens 101 is made of a material with an abrasiveness of ≤111 and a hardness of ≥650*107 Pa, and the first lens 101 is coated with a waterproof film.

[0110] In some embodiments of the present application, the material refractive index Nd1 and the material Abbe constant Vd1 of the first lens 101 satisfy: 1.70 <Nd1<2.00,25<Vd1<55。

[0111] In some embodiments of the present application, the material refractive index Nd1 and the material Abbe constant Vd1 of the second lens satisfy: 1.70 <Nd1<2.20,25<Vd1<55。

[0112] In some embodiments of the present application, the material refractive index Nd1 and the material Abbe constant Vd1 of the third lens satisfy: 1.70 <Nd1<2.00,25<Vd1<55。

[0113] In some embodiments of the present application, the material refractive index Nd1 and the material Abbe constant Vd1 of the fourth lens satisfy: 1.70 <Nd1<2.00,25<Vd1<60。

[0114] In some embodiments of the present application, the material refractive index Nd1 and the material Abbe constant Vd1 of the fifth lens satisfy: 1.4 <Nd1<1.65,60<Vd1<95。

[0115] In some embodiments of the present application, the refractive index Nd1 and the Abbe constant Vd1 of the sixth lens satisfy the following: 1.70 <Nd1<2.00,25<Vd1<55。

[0116] Further, in some embodiments of the present application, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, the fifth lens 105, and the sixth lens 106 provided by the present application further satisfy:

[0117] -10 < f1 < -2;

[0118] 1 < f2 < 10;

[0119] -10 < f3 < -2;

[0120] 1 < f4 < 10;

[0121] 1 < f5 < 10;

[0122] -12 < f6 < -2;

[0123] 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.

[0124] Furthermore, the effective focal length f of the optical imaging lens satisfies: 5.0 mm ≤ f ≤ 6.0 mm.

[0125] Furthermore, the aperture value F# of the optical imaging lens satisfies: F# ≤ 1.8.

[0126] Furthermore, the total optical length TTL of the optical imaging lens satisfies: TTL ≤ 23.0 mm.

[0127] Furthermore, the field of view FOV of the optical imaging lens satisfies: 70.0° ≤ FOV ≤ 85.0°.

[0128] Furthermore, the image height h of the optical imaging lens satisfies: 7.0 mm ≤ h ≤ 7.8 mm.

[0129] Furthermore, the optical imaging lens provided by the present application further includes a sensor, which is adaptively arranged with each lens, and the size of the sensor is 1 / 2.44 inches.

[0130] Furthermore, the optical imaging lens provided by the present application further includes a first lens 101. The seventh lens is a plano lens, and the seventh lens 107 is located between the sixth lens 106 and the sensor.

[0131] The detailed optical data of this embodiment is shown in Table 1.

[0132] )]]

[0133]

[0134] Table 1

[0135] In this embodiment, the lens focal length f is 5.534 mm, the aperture value F is 1.796, the total optical length TTL is 22.0 mm, the field of view FOV is 77.6°, and the image height h is 7.420 mm.

[0136] As Figure 2 shown, Figure 2 is the MTF curve graph of this embodiment. As Figure 3 shown, Figure 3 is the lateral chromatic aberration curve graph of this embodiment. As Figure 4 shown, Figure 4 is the focal length shift curve graph. As Figure 5 shown, Figure 5 is the field curvature curve graph. As Figure 6 shown, Figure 6 is the distortion graph.

[0137] It should be noted that Figure 2 the MTF curve graph shown is the MTF curve graph of Embodiment 1 at 20°C. Again, as Figure 7 and Figure 8 shown, Figure 7 is the MTF curve graph of Embodiment 1 at -40°C, Figure 8 is the MTF curve graph of Embodiment 1 at 105°C.

[0138] From Figure 2 , Figure 7 and Figure 8 the shown MTF curve graphs, it can be seen that for the optical imaging lens provided by this application, under the condition of 20°C, when the spatial frequency is 167 pl / mm, the MTF value of the 0.8 field of view is greater than 0.3, and the MTF value of the 1 field of view is greater than 0.15, with high resolution and good imaging effect.

[0139] And under the condition of -40°C, when the spatial frequency is 167 pl / mm, the MTF value of the 0.8 field of view is greater than 0.3, and the MTF value of the 1 field of view is greater than 0.1. Under the condition of 105°C, when the spatial frequency is 167 pl / mm, the MTF value of the 0.8 field of view is greater than 0.3, and the MTF value of the 1 field of view is greater than 0.15.

[0140] In summary, it can be known that the optical imaging lens provided by this application can maintain a good imaging effect at 20°C, as well as under the extreme conditions of -40°C and 105°C, and can better resist temperature fluctuations.

[0141] Furthermore, it's important to note that combining high- and low-dispersion materials (such as the fifth and sixth lenses cemented together) can help correct chromatic aberration and optimize image quality. This cemented combination can reduce sensitivity to tolerances, while also allowing some residual chromatic aberration to balance the optical system's chromatic aberration. It also reduces sensitivity to tolerances such as tilt or decentration that can occur during lens assembly.

[0142] Example 2

[0143] The surface profiles and refractive powers of the lenses of this embodiment and embodiment 1 are substantially the same, with only the optical parameters of individual lenses being different. Detailed optical data are shown in Table 2.

[0144]

[0145]

[0146] Table 2

[0147] In this embodiment, the focal length f of the lens is 5.483 mm, the aperture value F is 1.799, the total optical TTL is 21.6 mm, the field of view FOV is 78.6°, and the image height h is 7.508 mm.

[0148] The MTF curve of Example 2 is as follows: Figure 9 As shown, the vertical axis chromatic aberration curve is as follows Figure 10 As shown, the focus offset curve is as follows Figure 11 As shown, the field curvature curve is as follows Figure 12 As shown in the figure, the distortion diagram is as follows Figure 13 shown.

[0149] Example 3

[0150] The surface profiles and refractive powers of the lenses of this embodiment and embodiment 1 are substantially the same, with only the optical parameters of individual lenses being different. Detailed optical data are shown in Table 3.

[0151]

[0152] Table 3

[0153] In this embodiment, the focal length f of the lens is 5.429 mm, the aperture value F is 1.797, the total optical TTL is 22.0 mm, the field of view FOV is 79.0°, and the image height h is 7.438 mm.

[0154] The MTF curve of Example 3 is as follows: Figure 14 As shown, the vertical axis chromatic aberration curve is as follows Figure 15 As shown, the focus offset curve is as follows Figure 16 As shown, the field curvature curve is as follows Figure 17 As shown, the distortion diagram is as follows Figure 18 shown.

[0155] As can be seen from the MTF curve graphs of the above embodiments, when the spatial frequency is 167 p / mm, the MTF value at a 0.8 field of view angle is greater than 0.3, and the MTF value at a 1 field of view angle is greater than 0.15, with high resolution and good imaging effect.

[0156] As can be seen from the lateral chromatic aberration curve graphs of the above embodiments, in the visible light band of 435 nm to 650 nm, the overall curve is relatively flat with little fluctuation, the lateral chromatic aberration is less than 3.5 μm, the overall chromatic aberration is small, and the imaging effect is good.

[0157] As can be seen from the focal length shift curve graphs of the above embodiments, in the visible light band of 435 nm to 650 nm, the focal point shift amount in the whole band < 18 μm, the overall curve is relatively smooth without mutation or spike, and the focal length change of the lens at different wavelengths is uniform. The lens has high color reproduction accuracy and high overall imaging quality.

[0158] As can be seen from the field curvature curve graphs of the above embodiments, the curve is flat and the value is small, the imaging surface is close to a plane, and the imaging quality is good. [[ID=!2]]

[0159] As can be seen from the distortion graphs of the above embodiments, the curve is flat, the distortion of the lens at different positions is small, and the imaging quality is good.

[0160] In summary, the optical imaging lens provided by the present application has a good comprehensive imaging effect, few lens elements, short lens TTL, small overall volume, which is beneficial to reducing the overall cost and has a good imaging effect.

[0161] On this basis, the present application further provides an electronic rearview mirror, which includes any one of the above optical imaging lenses and has the beneficial effects of the above optical imaging lenses.

[0162] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An optical imaging lens, characterized in that, A first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, and a sixth lens are sequentially arranged along an optical axis from the object side to the image side. Each of the first lens to the sixth lens includes an object side face facing the object side and allowing imaging light rays to pass through, and an image side face facing the image side and allowing imaging light rays to pass through. The first lens has a negative refractive power. The object side face of the first lens is convex, and the image side face is concave. The second lens has a positive refractive power. The object side face of the second lens is convex, and the image side face is flat. The third lens has a negative refractive power. The object side face of the third lens is concave, and the image side face is concave. The fourth lens has a positive refractive power. The object side face of the fourth lens is convex, and the image side face is convex. The fifth lens has a positive refractive power. The object side face of the fifth lens is convex, and the image side face is convex. The sixth lens has a negative refractive power. The object side face of the sixth lens is concave, and the image side face is convex. The image side face of the fifth lens and the object side face of the sixth lens are adhesively bonded to form a combined lens, and the refractive power of the combined lens is greater than zero. And the fifth lens and the sixth lens satisfy: -10×10-4mm / ℃ < f5*(dn / dt)5 + f6*(dn / dt)6 < 10×10-4mm / ℃; Wherein, f5 represents the focal length of the fifth lens, f6 represents the focal length of the sixth lens, (dn / dt)5 represents the refractive index temperature coefficient of the fifth lens at 0 to 20°C, and (dn / dt)6 represents the refractive index temperature coefficient of the sixth lens at 0 to 20°C.

2. The optical imaging lens according to claim 1, wherein The refractive index temperature coefficient of the fifth lens is less than zero.

3. The optical imaging lens according to claim 1, wherein The first lens is made of a material with a wear degree ≤ 111 and a hardness ≥ 650×10 7 Pa, and the first lens is coated with a waterproof film.

4. The optical imaging lens according to claim 1, wherein The refractive index Nd1 of the material of the first lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 55; and / or The refractive index Nd1 of the material of the second lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.20, 25 < Vd1 < 55; and / or The refractive index Nd1 of the material of the third lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 55; and / or The refractive index Nd1 of the material of the fourth lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 60; and / or The refractive index Nd1 of the material of the fifth lens and the Abbe number Vd1 of the material satisfy: 1.4 < Nd1 < 1.65, 60 < Vd1 < 95; and / or The refractive index Nd1 of the material of the sixth lens and the Abbe number Vd1 of the material satisfy: 1.70 < Nd1 < 2.00, 25 < Vd1 < 55.

5. The optical imaging lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy: -10<f1<-2； 1<f2<10； -10<f3<-2； 1<f4<10； 1<f5<10； -12<f6<-2； 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.

6. The optical imaging lens according to claim 1, wherein the effective focal length f of the optical imaging lens satisfies: 5.0 mm ≤ f ≤ 6.0 mm; the aperture value F# of the optical imaging lens satisfies: F# ≤ 1.8; the overall optical length TTL of the optical imaging lens satisfies: TTL ≤ 23.0 mm; the field of view FOV of the optical imaging lens satisfies: 77.0° ≤ FOV ≤ 85.0°; the image height h of the optical imaging lens satisfies: 7.0 mm ≤ h ≤ 7.8 mm.

7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further includes: a sensor, the sensor is adaptively arranged with each lens, and the size of the sensor is 1 / 2.44 inches.

8. The optical imaging lens according to claim 7, wherein, The optical imaging lens further includes: a seventh lens, the seventh lens is a plano lens, and the seventh lens is located between the sixth lens and the sensor.

9. An electronic rearview mirror, characterized in that, The electronic rearview mirror includes: the optical imaging lens according to any one of claims 1-8.

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