Rear view camera

Abstract

This application relates to the field of optical imaging technology, and particularly to a rear-view lens. The rear-view lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged along the optical axis of the rear-view lens from the object side of the rear-view lens to the imaging surface; the first lens, the fourth lens, the fifth lens, and the seventh lens have positive optical powers, and the second lens, the third lens, and the sixth lens have negative optical powers; the f-number F# of the rear-view lens satisfies: 1.4 < F# < 1.6. Through the reasonable combination of each lens, the imaging quality of the rear-view lens can be effectively improved, the cost can be reduced, and the target surface is relatively large.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and particularly to a rear-view lens. Background Art

[0002] In recent years, with the rapid development of the high-definition camera and vehicle-mounted module industries, rear-view lenses have been widely used in various vehicles to provide drivers with a view behind the vehicle. At the same time, people's requirements for the imaging quality and high cost performance of rear-view lenses are also increasing. However, the currently used rear-view lenses generally have problems such as poor imaging quality, too small target surface, and high cost.

[0003] The above information disclosed in this background art section is only used to enhance the understanding of the background of the present disclosure. Therefore, the above information may include any part that does not form the prior art and also information of the prior art that may not be taught to those of ordinary skill in the art. Summary of the Invention

[0004] The Summary of the Invention is provided to introduce, in a simplified form, selected concepts that will be further described in the Detailed Description below. The Summary of the Invention is neither intended to identify the key features or essential features of the claimed subject matter nor intended to be used to assist in determining the scope of the claimed subject matter.

[0005] The object of the present invention is to provide a rear-view lens with high imaging quality, high cost performance, and a large target surface.

[0006] The present invention provides a rear-view lens, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged along the optical axis of the rear-view lens from the object side to the imaging surface of the rear-view lens; the first lens, the fourth lens, the fifth lens, and the seventh lens have positive optical powers, and the second lens, the third lens, and the sixth lens have negative optical powers; the rear-view lens satisfies: 1.4 < F# < 1.6, where F# is the aperture number of the rear-view lens.

[0007] Further, the object-side surface of the first lens is convex along the optical axis, and the image-side surface of the first lens is concave along the optical axis; the object-side surface of the second lens is convex along the optical axis, and the image-side surface of the second lens is concave along the optical axis; the object-side surface of the third lens is concave along the optical axis, and the image-side surface of the third lens is convex along the optical axis; the image-side surface of the fourth lens is convex along the optical axis; the image-side surface and the object-side surface of the fifth lens are both convex along the optical axis; the object-side surface of the sixth lens is concave along the optical axis; the object-side surface and the image-side surface of the seventh lens are both convex along the optical axis.

[0008] Furthermore, the rear-view lens further includes:

[0009] An aperture, which is disposed between the third lens and the fourth lens;

[0010] A filter element, which is a visible light filter. The visible light filter is disposed on one side of the eighth lens facing the imaging surface; alternatively, the filter element is a visible light filter film layer, and the visible light filter film layer is plated on the object side surface of the fourth lens.

[0011] Furthermore, the rear-view lens satisfies: 60° < 2θ < 80°, where 2θ is the full field angle of the rear-view lens.

[0012] Furthermore, the rear-view lens satisfies: RI > 70%, where RI is the illuminance of the rear-view lens.

[0013] Furthermore, the rear-view lens satisfies: 2 < T L / h < 4; T L is the total optical length of the rear-view lens, and h is the image plane height of the rear-view lens.

[0014] Furthermore, the rear-view lens satisfies: is the combined optical power of the first lens, the second lens and the third lens, is the optical power of the rear-view lens.

[0015] Furthermore, the rear-view lens satisfies: is the combined optical power of the fourth lens, the fifth lens and the sixth lens, is the optical power of the rear-view lens.

[0016] Furthermore, the rear-view lens satisfies: is the optical power of the seventh lens, is the optical power of the rear-view lens.

[0017] Furthermore, the rear-view lens satisfies: 0.5 < SD1 / h < 1.5; SD1 is the semi-aperture of the first lens, and h is the image plane height of the rear-view lens.

[0018] Furthermore, the rear-view lens satisfies: R14 < -20, 9 < CRA < 21; R14 is the radius of curvature of the image side surface of the seventh lens, and CRA is the principal ray angle of the rear-view lens.

[0019] Further, the rear-view lens satisfies: V5>40, 3<(V4+V5) / V6<6, (|R8|-R11) / R10<4; V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the fifth lens, and V6 is the Abbe number of the sixth lens; R8 is the curvature radius of the object-side surface of the fourth lens, R10 is the curvature radius of the object-side surface of the fifth lens, and R11 is the curvature radius of the object-side surface of the sixth lens.

[0020] Further, the rear-view lens satisfies: 0.6<(R4+R10) / R13<2; R4 is the curvature radius of the image-side surface of the second lens, R10 is the curvature radius of the object-side surface of the fifth lens, and R13 is the curvature radius of the object-side surface of the seventh lens.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The rear-view lens provided by the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence along the optical axis of the rear-view lens from the object side to the imaging surface; the first lens, the fourth lens, the fifth lens, and the seventh lens have positive optical powers, and the second lens, the third lens, and the sixth lens have negative optical powers; the aperture number F# of the rear-view lens satisfies: 1.4<F#<1.6. Through the reasonable combination of each lens, the imaging quality of the rear-view lens can be effectively improved, the cost can be reduced, and the target surface is relatively large. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0024] Figure 1 A diagram showing a first example of a rear-view lens;

[0025] Figure 2 Present Figure 1 The defocus curve graph of the rear-view lens shown;

[0026] Figure 3 Present Figure 1 The MTF curve graph of the rear-view lens shown;

[0027] Figure 4 Present Figure 1 The illuminance curve graph of the rear-view lens shown;

[0028] Figure 5 Presentation Figure 1 The chief ray angle curve diagram of the rearview lens shown;

[0029] Figure 6 Presentation Figure 1 The imaging spot size of the rearview lens shown;

[0030] Figure 7 A diagram showing a second example of a rearview lens;

[0031] Figure 8 Presentation Figure 7 The defocus curve diagram of the rearview lens shown;

[0032] Figure 9 Presentation Figure 7 The MTF curve diagram of the rearview lens shown;

[0033] Figure 10 Presentation Figure 7 The illumination curve diagram of the rearview lens shown;

[0034] Figure 11 Presentation Figure 7 The chief ray angle curve diagram of the rearview lens shown;

[0035] Figure 12 Presentation Figure 7 The imaging spot size of the rearview lens shown;

[0036] Figure 13 A diagram showing a third example of a rearview lens;

[0037] Figure 14 Presentation Figure 13 The defocus curve diagram of the rearview lens shown;

[0038] Figure 15 Presentation Figure 13 The MTF curve diagram of the rearview lens shown;

[0039] Figure 16 Presentation Figure 13 The illumination curve diagram of the rearview lens shown;

[0040] Figure 17 Presentation Figure 13 The chief ray angle curve diagram of the rearview lens shown;

[0041] Figure 18 Presentation Figure 13 The imaging spot size of the rearview lens is shown.

[0042] Reference numerals:

[0043] exist Figure 1In the figure, 101 is the first lens, 102 is the second lens, 103 is the third lens, 104 is the fourth lens, 105 is the fifth lens, 106 is the sixth lens, 107 is the seventh lens, 108 is the visible light filter, 109 is the aperture, and 110 is the cover glass.

[0044] exist Figure 7 In the figure, 201 is the first lens, 202 is the second lens, 203 is the third lens, 204 is the fourth lens, 205 is the fifth lens, 206 is the sixth lens, 207 is the seventh lens, 208 is the visible light filter, 209 is the aperture, and 210 is the cover glass.

[0045] exist Figure 13 In the figure, 301 is the first lens, 303 is the second lens, 304 is the third lens, 305 is the fourth lens, 306 is the sixth lens, 307 is the seventh lens, 308 is the visible light filter, 309 is the aperture, and 310 is the cover glass. DETAILED DESCRIPTION

[0046] The following detailed description is provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various permutations, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein, but, except for operations that must occur in a particular order, changes may be made that will be apparent after understanding the disclosure of the present application. In addition, descriptions of features known in the art may be omitted for clarity and brevity.

[0047] The features described herein may be implemented in different forms and are not to be construed as limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0048] The present application provides a rearview lens with high imaging quality, high cost performance and a large target area.

[0049] In the embodiment of the present application, the first lens is the lens closest to the object (or subject), and the eighth lens is the lens closest to the imaging surface (or sensor chip). In addition, in the present application, the curvature radius, semi-aperture and thickness of the lens, and the total optical length (T) of the lens are all expressed in millimeters (mm). L ), image height (h) and focal length (f).

[0050] In addition, the thickness of the lens, the distance between the lenses, and TL This is a distance measured based on the optical axis of the lens. Furthermore, in describing the shape of a lens, stating that one surface of the lens is convex along the optical axis means that the paraxial region of the corresponding surface is convex, and stating that one surface of the lens is concave along the optical axis means that the paraxial region of the corresponding surface is concave. Therefore, even when one surface of a lens is described as convex, the edge portion of that surface may be concave. Similarly, even when one surface of a lens is described as concave, the edge portion of that surface may be convex.

[0051] The rearview lens provided in the present application includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence along the optical axis of the rearview lens from the object side to the imaging surface of the rearview lens.

[0052] The first lens has positive focal power, and its object-side surface is convex along the optical axis, and its image-side surface is concave along the optical axis. The second lens has negative focal power, and its object-side surface is convex along the optical axis, and its image-side surface is concave along the optical axis. The third lens has negative focal power, and its object-side surface is concave along the optical axis, and its image-side surface is convex along the optical axis. The fourth lens has positive focal power, and its image-side surface is convex along the optical axis. The fifth lens has positive focal power, and both its object-side surface and its image-side surface are convex along the optical axis. The sixth lens has negative focal power, and both its object-side surface and its image-side surface are concave along the optical axis. The seventh lens has positive focal power, and both its object-side surface and its image-side surface are convex along the optical axis.

[0053] In some embodiments, the fifth lens and the sixth lens form a cemented lens.

[0054] In some embodiments, the first to seventh lenses are all glass lenses, wherein the first, third, fourth, fifth, and sixth lenses are glass spherical lenses, and the second and seventh lenses are glass aspherical lenses.

[0055] Any aspherical surface of the second lens and the seventh lens can be expressed by Equation 1:

[0056]

[0057] Among them, z is the sag of the aspheric surface, c is the paraxial curvature of the aspheric surface, h is the effective radius of the aspheric surface, K is the quadratic surface coefficient, and BE is the high-order term coefficient of the aspheric surface.

[0058] In some embodiments, the rearview lens further includes an aperture, which is disposed between the third and fourth lenses. Placing the aperture between the third and fourth lenses not only precisely adjusts the amount of light passing through, ensuring clear images even in dimly lit scenes and improving imaging quality, but also helps control the incident angle of the principal light reaching the imaging surface, effectively controlling it within 15±6°, which better meets the incidence requirements of the sensor chip.

[0059] Preferably, the aperture is a light-shielding paper with a light-through hole in the center. Using the light-shielding paper as the aperture can reduce the requirements for the light-through hole of the lens barrel of the rearview lens to a certain extent, thereby ensuring the processing accuracy to the greatest extent and reducing processing errors.

[0060] In some embodiments, the rearview lens may further include a filter to suppress the transmission of light in non-working bands through the filter, thereby effectively reducing chromatic aberration and stray light of the rearview lens and improving imaging effects.

[0061] The filter is a visible light filter, which is arranged on the side of the eighth lens facing the imaging surface; or, the filter can be a visible light filter film layer coated on the object side surface of the fourth lens.

[0062] In some embodiments, the rearview lens further includes a cover glass. If the side of the rearview lens facing the object is the front and the side of the rearview lens facing the imaging surface is the rear, the cover glass is disposed at the rearmost portion of the rearview lens.

[0063] The rearview lens involved in this application can meet the following conditional expressions:

[0064] In some embodiments, 1.4 is satisfied <F#<1.6;

[0065] In some embodiments, 60°<2θ<80° is satisfied;

[0066] In some embodiments, RI>70% is satisfied;

[0067] In some embodiments, 2 <T L / h<4;

[0068] In some embodiments,

[0069] In some embodiments,

[0070] In some embodiments,

[0071] In some embodiments, 0.5 <SD1 / h<1.5;

[0072] In some embodiments, R14 < -20 is satisfied;

[0073] In some embodiments, 9 < CRA < 21 is satisfied;

[0074] In some embodiments, V5 > 40 is satisfied;

[0075] In some embodiments, 3 < (V4 + V5) / V6 < 6 is satisfied; s

[0076] In some embodiments, (|R8| - R11) / R10 < 4 is satisfied;

[0077] In some embodiments, 0.6 < (R4 + R10) / R13 < 2 is satisfied.

[0078] In the above expressions, F# is the f-number of the rear-view lens, 2θ is the full field angle of the rear-view lens, RI is the illuminance of the rear-view lens, T L is the total optical length of the rear-view lens, h is the image plane height of the rear-view lens, is the optical power of the rear-view lens, is the combined optical power of the first, second, and third lenses, is the combined optical power of the fourth, fifth, and sixth lenses, is the optical power of the seventh lens, SD1 is the semi-aperture of the first lens, CRA is the chief ray angle of the rear-view lens, V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the fifth lens, V6 is the Abbe number of the sixth lens, R8 is the curvature radius of the object-side surface of the fourth lens, R10 is the curvature radius of the object-side surface of the fifth lens, R11 is the curvature radius of the object-side surface of the sixth lens, R4 is the curvature radius of the image-side surface of the second lens, R13 is the curvature radius of the object-side surface of the seventh lens, and R14 is the curvature radius of the image-side surface of the seventh lens.

[0079] In addition, according to 60° < 2θ < 80° and 1.4 < F# < 1.6, it is at least possible to ensure that the rear-view lens has sufficiently good imaging quality; when the f-number F# exceeds the upper limit, the remaining aberration correction margin of the entire rear-view lens is excessive; when the f-number F# is lower than the lower limit, the aberration of the entire rear-view lens is too large and the imaging quality is poor.

[0080] In addition, according to RI > 70%, it is at least possible to ensure that the rear-view lens has better imaging uniformity and improve the imaging quality.

[0081] In addition, according to 2 < T L / h < 4, it is at least possible to limit the total length of the rear-view lens to a certain extent and ensure that the rear-view lens has sufficiently good imaging quality. When T LWhen the value of / h exceeds the upper limit, the overall length of the rear-view lens is too long. Or, if the overall length of the rear-view lens is shortened, the image height of the rear-view lens will be insufficient. When T L When the value of / h is lower than the lower limit, due to the excessive optical power of each lens, it is difficult to correct the aberration of the rear-view lens, and the resolution ability is significantly reduced.

[0082] In addition, according to The first, second, and third lenses form the front lens group of the rear-view lens, which is mainly used to converge the object surface light with a wide viewing angle into the lens, correct the lens distortion at the same time, and do not generate large aberrations. When When the value exceeds the upper limit, the combined optical power of the front lens group is too strong. Although it can make the overall length of the rear-view lens smaller, the spherical aberration generated is too large and difficult to correct. When When the value is lower than the lower limit, the optical power of the front lens group is weak. Although the spherical aberration is relatively reduced, its refractive power decreases, resulting in an increase in the overall length of the rear-view lens.

[0083] In addition, according to The fourth, fifth, and sixth lenses form the middle lens group of the rear-view lens. The middle lens group承接 the above front lens group and effectively配合 the front lens group; and the middle lens group mainly承担 the overall optical power of the lens in the rear-view lens and校正 the vertical aberration. When φ When the value exceeds the upper limit, the optical power of the middle lens group is too strong. Although it can make the overall length of the rear-view lens smaller, large spherical aberration, astigmatism, and field curvature will be generated, which is difficult to correct. When When the value is lower than the lower limit, the optical power of the middle lens group weakens. Although the above-mentioned aberrations will be relatively reduced, its refractive power decreases, resulting in an increase in the overall length of the rear-view lens.

[0084] In addition, according to The seventh lens承接 the lens group in front of it, can effectively改善 the aberration and提高 the imaging quality. When When the value exceeds the upper limit or is lower than the lower limit, the aberration correction ability of the seventh lens will decrease.

[0085] In addition, according to 0.5 < SD1 / h < 1.5, the first lens mainly plays a role in collecting light in the rear-view lens. The larger its overall outer diameter, the better the light collection effect, but it increases the overall size of the rear-view lens. When this relationship is satisfied, at least it can ensure that the rear-view lens has a good light collection effect, and at the same time ensure that the size of the rear-view lens is not too large.

[0086] In addition, according to R14 < -20 and 9 < CRA < 21, at least it can effectively校正 the aberration, and at the same time尽可能地改变 the main ray angle of the rear-view lens,增加 the chip compatibility of the rear-view lens, and增加 the variety of optional sensor chips.

[0087] It should be noted that there are some words in the original text that seem to be incorrect or incomplete in terms of grammar or semantics. The translation is done as accurately as possible based on the existing text. For example, "承接" and "配合" are directly translated as they are, but they might need to be adjusted to more appropriate words in a more polished context. Also, "承担" is translated as "承担", which might be a typo in the original Chinese and should probably be "承担" in a correct text.This is because, according to V5>40, 3<(V4+V5) / V6<6, and (|R8|-R11) / R10<4, at least the middle lens group can provide the overall optical power of the rearview lens while also properly correcting aberrations.

[0088] In addition, according to 0.6<(R4+R10) / R13<2, it can at least ensure that the distortion of the rearview lens is well corrected, so that the imaging ratio of the rearview lens is close to the actual ratio of the objective object.

[0089] Next, a rear view lens according to several examples will be described.

[0090] First, refer to Figure 1 A rear view lens according to a first example is described.

[0091] The rear view lens according to the first example includes a first lens 101 , a second lens 102 , a third lens 103 , a fourth lens 104 , a fifth lens 105 , a sixth lens 106 , and a seventh lens 107 . The first lens has positive focal power, the object surface of the first lens is convex along the optical axis, and the image surface of the first lens is concave along the optical axis; the second lens has negative focal power, the object surface of the second lens is convex along the optical axis, and the image surface of the second lens is concave along the optical axis; the third lens has negative focal power, the object surface of the third lens is concave along the optical axis, and the image surface of the third lens is convex along the optical axis; the fourth lens has positive focal power, and both the object surface and the image surface of the fourth lens are convex along the optical axis; the fifth lens has positive focal power, and both the object surface and the image surface of the fifth lens are convex along the optical axis; the sixth lens has negative focal power, the object surface of the sixth lens is concave along the optical axis, and the image surface of the sixth lens is convex along the optical axis, and the sixth lens and the fifth lens form a cemented lens; the seventh lens has positive focal power, and both the object surface and the image surface of the seventh lens are convex along the optical axis.

[0092] The rearview lens further includes an aperture 109, a visible light filter 108 and a cover glass 110. The aperture is arranged between the third lens and the fourth lens, the visible light filter is arranged behind the seventh lens, and the cover glass is arranged behind the visible light filter.

[0093] In the optical lens according to the first example, the aperture number F# of the rearview lens is 1.5, the total focal length (effective focal length) f of the rearview lens is 7.7 mm, the illumination RI of the rearview lens is 0.8, and the total optical length T of the rearview lens is 0. L The image plane height h of the rearview lens is 30 mm, the full field angle 2θ of the rearview lens is 9.2 mm, and the combined optical power of the first lens, the second lens and the third lens is 70°. The combined optical power of the fourth lens, the fifth lens and the sixth lens is -0.1. The optical power of the seventh lens is 1.11. The semi-aperture SD1 of the first lens is 8.5 mm, and the chief ray angle CRA of the rearview lens is 9.4°.

[0094] Table 1

[0095]

[0096] In Table 1, S1 and S2 represent the object-side surface and image-side surface of the first lens, respectively; S3 and S4 represent the object-side surface and image-side surface of the second lens, respectively; and so on. The fifth lens and the sixth lens form a cemented lens group, and S11 is the image-side surface of the fifth lens, which is also the object-side surface of the sixth lens.

[0097] Table 2

[0098] Surface serial number K B C D E S3 6.14E+00 -3.84E-05 6.86E-07 -1.53E-08 5.10E-10 S4 -2.56E-02 5.25E-05 2.79E-07 1.68E-08 -2.45E-09 S13 -1.96E+00 1.19E-05 6.48E-07 -8.02E-08 1.22E-06 S14 -6.00E-01 3.95E-05 -2.05E-06 4.26E-08 -4.80E-11

[0099] In Table 2, K, B, C, D, and E represent the high-order coefficients of the aspheric surface in the above equation 1.

[0100] Figure 2 The defocus curve of the rearview lens of the first example is presented. Figure 3 The MTF curve of the rearview lens of the first example is presented. Figure 4 The illumination curve of the rearview lens of the first example is presented. Figure 5 The main ray angle curve of the rearview lens of the first example is presented. Figure 6 Table 1 presents the imaging point size of the rearview lens of the first example; Table 1 presents the characteristics of the lens of the rearview lens according to the first example,

[0101] Table 2 presents high-order term coefficients of the aspherical surface of the aspherical lens of the rear view lens according to the first example.

[0102] Will refer to Figure 7 A rear view lens according to a second example is described.

[0103] The rear view lens according to the second example includes a first lens 201 , a second lens 202 , a third lens 203 , a fourth lens 204 , a fifth lens 205 , a sixth lens 206 , and a seventh lens 207 . The first lens has positive focal power, the object surface of the first lens is convex along the optical axis, and the image surface of the first lens is concave along the optical axis; the second lens has negative focal power, the object surface of the second lens is convex along the optical axis, and the image surface of the second lens is concave along the optical axis; the third lens has negative focal power, the object surface of the third lens is concave along the optical axis, and the image surface of the third lens is convex along the optical axis; the fourth lens has positive focal power, and both the object surface and the image surface of the fourth lens are convex along the optical axis; the fifth lens has positive focal power, and both the object surface and the image surface of the fifth lens are convex along the optical axis; the sixth lens has negative focal power, and both the object surface and the image surface of the sixth lens are concave along the optical axis, and the sixth lens and the fifth lens form a cemented lens; the seventh lens has positive focal power, and both the object surface and the image surface of the seventh lens are convex along the optical axis.

[0104] The rearview lens further includes an aperture 209, a visible light filter 208 and a cover glass 210. The aperture is arranged between the third lens and the fourth lens, the visible light filter is arranged behind the seventh lens, and the cover glass is arranged behind the visible light filter.

[0105] In the optical lens according to the second example, the aperture number F# of the rearview lens is 1.5, the total focal length (effective focal length) f of the rearview lens is 7.7 mm, the illuminance RI of the rearview lens is 0.8, and the total optical length T of the rearview lens is 0. L The image plane height h of the rearview lens is 26.4mm, the full field angle 2θ of the rearview lens is 9.2mm, and the combined optical power of the first lens, the second lens and the third lens is 70°. The combined optical power of the fourth lens, the fifth lens, and the sixth lens is -0.029. The optical power of the seventh lens is 0.9. The semi-aperture SD1 of the first lens is 8.5 mm, and the chief ray angle CRA of the rearview lens is 19.4°.

[0106] Table 3

[0107]

[0108]

[0109] In Table 3, S1 and S2 represent the object-side surface and image-side surface of the first lens, respectively; S3 and S4 represent the object-side surface and image-side surface of the second lens, respectively; and so on. The fifth lens and the sixth lens form a cemented lens group, and S11 is the image-side surface of the fifth lens, which is also the object-side surface of the sixth lens.

[0110] Table 4

[0111] Surface serial number K B C D E S3 2.81E-01 -1.72E-05 3.37E-08 -1.39E-08 4.65E-10 S4 -5.78E-04 3.73E-05 3.89E-08 2.07E-10 -1.42E-09 S13 -1.35E+00 6.03E-06 2.45E-07 -5.31E-08 7.94E-07 S14 -2.86E-02 5.54E-06 -5.59E-07 2.23E-09 -6.80E-12

[0112] In Table 4, K, B, C, D, and E represent the high-order coefficients of the aspheric surface in the above equation 1.

[0113] Figure 8 The defocus curve of the rearview lens of the second example is presented. Figure 9 The MTF curve of the rearview lens of the second example is presented. Figure 10 The illumination curve of the rearview lens of the second example is presented. Figure 11 The main ray angle curve of the rearview lens of the second example is presented. Figure 12 Table 3 presents the imaging point size of the rearview lens of the second example; Table 3 presents the characteristics of the lens of the rearview lens according to the second example, and Table 4 presents the high-order coefficients of the aspherical surface of the aspherical lens of the rearview lens according to the second example.

[0114] Will refer to Figure 13 A rear view lens according to a third example is described.

[0115] The rear view lens according to the third example includes a first lens 301 , a second lens 302 , a third lens 303 , a fourth lens 304 , a fifth lens 305 , a sixth lens 306 , and a seventh lens 307 . The first lens has positive focal power, the object surface of the first lens is convex along the optical axis, and the image surface of the first lens is concave along the optical axis; the second lens has negative focal power, the object surface of the second lens is convex along the optical axis, and the image surface of the second lens is concave along the optical axis; the third lens has negative focal power, the object surface of the third lens is concave along the optical axis, and the image surface of the third lens is convex along the optical axis; the fourth lens has positive focal power, the object surface of the fourth lens is concave along the optical axis, and the image surface of the fourth lens is convex along the optical axis; the fifth lens has positive focal power, and both the object surface and the image surface of the fifth lens are convex along the optical axis; the sixth lens has negative focal power, and both the object surface and the image surface of the sixth lens are concave along the optical axis, and the sixth lens and the fifth lens form a cemented lens; the seventh lens has positive focal power, and both the object surface and the image surface of the seventh lens are convex along the optical axis.

[0116] The rearview lens further includes an aperture 309, a visible light filter 308 and a cover glass 310. The aperture is arranged between the third lens and the fourth lens, the visible light filter is arranged behind the seventh lens, and the cover glass is arranged behind the visible light filter.

[0117] In the optical lens according to the third example, the aperture number F# of the rearview lens is 1.5, the total focal length (effective focal length) f of the rearview lens is 7.7 mm, the illumination RI of the rearview lens is 0.95, and the total optical length T of the rearview lens is 0. L The image plane height h of the rearview lens is 30 mm, the full field angle 2θ of the rearview lens is 9.2 mm, and the combined optical power of the first lens, the second lens and the third lens is 70°. The combined optical power of the fourth lens, the fifth lens and the sixth lens is -0.01. The optical power of the seventh lens is 0.082. is 0.055, the semi-aperture SD1 of the first lens is 8.5 mm, and the chief ray angle CRA of the rearview lens is 18.7°.

[0118] Table 5

[0119]

[0120]

[0121] In Table 5, S1 and S2 represent the object-side surface and image-side surface of the first lens, respectively; S3 and S4 represent the object-side surface and image-side surface of the second lens, respectively; and so on. The fifth lens and the sixth lens form a cemented lens group, and S11 is the image-side surface of the fifth lens, which is also the object-side surface of the sixth lens.

[0122] Table 6

[0123] Surface serial number K B C D E S3 2.21E-01 -1.15E-05 3.22E-08 -6.40E-09 3.66E-10 S4 -3.43E-04 2.36E-05 2.62E-08 1.44E-11 -9.02E-11 S13 -7.83E-01 1.08E-06 9.51E-08 -3.00E-08 6.40E-07 S14 -7.80E-03 1.49E-06 -3.71E-08 1.60E-09 -3.27E-12

[0124] In Table 6, K, B, C, D, and E represent the high-order coefficients of the aspheric surface in the above equation 1.

[0125] Figure 14 The defocus curve of the rearview lens of the third example is presented. Figure 15 The MTF curve of the rearview lens of the third example is presented. Figure 16 The illumination curve of the rearview lens of the third example is presented. Figure 17 The main ray angle curve of the rearview lens of the third example is presented. Figure 18 Table 5 presents the imaging point size of the rearview lens of the third example; Table 5 presents the lens characteristics of the rearview lens according to the third example, and Table 6 presents the high-order coefficients of the aspherical surface of the aspherical lens of the rearview lens according to the third example.

[0126] Table 7 presents values of conditional expressions of the rear view lens according to the first example, the second example, and the third example.

[0127] Table 7

[0128]

[0129] According to the above examples, the rearview lens of the present application has the following advantages:

[0130] The seven lenses of the rearview camera lens of the present application are all made of full glass lenses, which have a long service life and stability in use, and reduce the material and processing and assembly costs;

[0131] The rearview lens of the present application can effectively correct the aberration and has the advantage of small focus drift caused by high and low temperatures, and can adapt to different temperature occasions and has good temperature control;

[0132] The rearview lens of the present application can minimize the total optical length of the entire lens by properly matching the optical power of each lens, ensuring that high-quality images can be captured even in dark environments;

[0133] The rearview lens of the present application can well control the main light angle so that it perfectly matches the sensor chip, thereby improving the chip compatibility of the rearview lens.

[0134] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of this application that various changes in form and detail can be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein will be considered as descriptive meanings only and not for limiting purposes. The description of the features or aspects in each example will be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices or circuits are combined in different ways and / or replaced or supplemented with other components or their equivalents, appropriate results can be obtained. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents will be interpreted as being included in the present disclosure.

Claims

1. A rearview camera lens, characterized in that: The rear-view lens has seven optical lenses with optical power, and the seven optical lenses are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the imaging surface of the rear-view lens along the optical axis of the rear-view lens; The first lens, the fourth lens, the fifth lens, and the seventh lens have positive optical power, and the second lens, the third lens, and the sixth lens have negative optical power; The rear-view lens satisfies: 1.4 < F# < 1.6, where F# is the aperture number of the rear-view lens.

2. The rearview lens according to claim 1, wherein: The object-side surface of the first lens is convex along the optical axis, and the image-side surface of the first lens is concave along the optical axis; The object-side surface of the second lens is convex along the optical axis, and the image-side surface of the second lens is concave along the optical axis; The object-side surface of the third lens is concave along the optical axis, and the image-side surface of the third lens is convex along the optical axis; The image-side surface of the fourth lens is convex along the optical axis; Both the image-side surface and the object-side surface of the fifth lens are convex along the optical axis; The object-side surface of the sixth lens is concave along the optical axis; Both the object-side surface and the image-side surface of the seventh lens are convex along the optical axis.

3. The rearview lens according to claim 1, wherein: It further includes: An aperture, and the aperture is arranged between the third lens and the fourth lens; A filter element, the filter element is a visible light filter, and the visible light filter is arranged on one side of the seventh lens facing the imaging surface; or, the filter element is a visible light filter film layer, and the visible light filter film layer is plated on the object-side surface of the fourth lens.

4. The rearview lens according to any one of claims 1 to 3, characterized in that: The rear-view lens satisfies: 60° < 2θ < 80°, and 2θ is the full field angle of the rear-view lens.

5. The rearview lens according to any one of claims 1 to 3, characterized in that: The rear-view lens satisfies: RI > 70%, and RI is the illuminance of the rear-view lens.

6. The rearview lens according to any one of claims 1 to 3, characterized in that: The rearview lens meets the following requirements: 2 <T L / h<4; T L is the total optical length of the rearview lens, and h is the image plane height of the rearview lens.

7. The rearview lens according to any one of claims 1 to 3, characterized in that: The rearview lens meets the following requirements: is the combined optical power of the first lens, the second lens and the third lens, is the optical power of the rearview lens.

8. The rearview lens according to any one of claims 1 to 3, characterized in that: The rearview lens meets the following requirements: is the combined optical power of the fourth lens, the fifth lens and the sixth lens, is the optical power of the rearview lens.

9. The rearview lens according to any one of claims 1 to 3, characterized in that: The rearview lens meets the following requirements: is the focal power of the seventh lens, is the optical power of the rearview lens.

10. The rearview lens according to any one of claims 1 to 3, characterized in that: The rear-view lens satisfies: 0.5 < SD1 / h < 1.5; SD1 is the semi-aperture of the first lens, and h is the image plane height of the rear-view lens.

11. The rearview lens according to any one of claims 1 to 3, characterized in that: The rear-view lens satisfies: R14 < -20, 9 < CRA < 21; R14 is the radius of curvature of the image-side surface of the seventh lens, and CRA is the principal ray angle of the rear-view lens.

12. The rearview lens according to any one of claims 1 to 3, characterized in that: The rear-view lens satisfies: V5 > 40, 3 < (V4 + V5) / V6 < 6, (|R8| - R11) / R10 < 4; V4 is the Abbe number of the fourth lens, V5 is the Abbe number of the fifth lens, and V6 is the Abbe number of the sixth lens; R8 is the radius of curvature of the object-side surface of the fourth lens, R10 is the radius of curvature of the object-side surface of the fifth lens, and R11 is the radius of curvature of the object-side surface of the sixth lens.

13. The rearview lens according to any one of claims 1 to 3, characterized in that: The rear-view lens satisfies: 0.6 < (R4 + R10) / R ​

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