Optical lens assembly, camera module and terminal

Abstract

The embodiments of the present application disclose an optical lens assembly, a camera module, and a terminal, which belong to the field of optical imaging technology; the optical lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence along the optical axis from the object plane to the image plane; wherein the first lens has a positive refractive power, the radius of curvature of the object side of the first lens is positive, and the radius of curvature of the image side of the first lens is negative; the second lens has a negative refractive power; the fifth lens has a negative refractive power, and the radius of curvature of the object side of the fifth lens is negative. The optical lens assembly of the embodiments of the present application is used in a DMS, and can accurately and in real time capture the driver's information for system image analysis, so that when the driver is fatigued or distracted, the DMS can issue an alarm in time to provide protection for driving safety. When used in monitoring and security, detailed information can also be clearly recorded, providing corresponding technical support and application guarantees in practical applications.

Description

Technical Field

[0001] The present application relates to the field of optical imaging technology, and in particular to an optical lens assembly, a camera module and a terminal. Background Art

[0002] With the development of the automotive industry, technologies such as ADAS (Advanced Driving Assistant System) and DMS (Driver Monitoring System) have gradually matured. Among them, DMS needs to monitor the driver's head, facial expressions and movements in real time, and issue warnings for driver fatigue and distraction, such as closing eyes, lowering head, yawning, looking around, smoking, and talking on the phone. In order for DMS to accurately monitor the driver's head, facial expressions and movements in challenging lighting environments such as nighttime and backlighting, a camera device with high pixel and high resolution is urgently needed. Summary of the Invention

[0003] The embodiments of the present application provide an optical lens assembly, a camera module, and a terminal that can achieve high pixel resolution even in challenging lighting conditions such as nighttime and backlighting. The technical solution is as follows:

[0004] In a first aspect, an embodiment of the present application provides an optical lens assembly, comprising a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in sequence along an optical axis from an object plane to an image plane; wherein,

[0005] The first lens element has positive refractive power, the radius of curvature of the object-side surface of the first lens element is positive, and the radius of curvature of the image-side surface of the first lens element is negative;

[0006] The second lens has negative refractive power;

[0007] The fifth lens element has negative refractive power, and the radius of curvature of the object-side surface of the fifth lens element is negative.

[0008] Furthermore, half of the diagonal length of the effective pixel area on the image plane is ImgH, the total optical system length of the optical lens group is TTL, and ImgH and TTL satisfy the following conditional formula:

[0009] 0.1 <ImgH*2 / TTL<0.8。

[0010] The beneficial effects of the above further solution are as follows: By limiting the half of the diagonal length of the effective pixel area on the image plane and the total length of the optical system to satisfy: 0.1 < ImgH * 2 / TTL < 0.8, it can not only ensure the high-pixel imaging quality of the system, but also control the total length of the optical system, minimizing the volume of the camera composed of this optical lens group. When the half of the diagonal length of the effective pixel area on the image plane and the total length of the optical system exceed the range of the above conditional formula, the resolution of the imaging system will decrease, which is not conducive to the miniaturization characteristics of the system.

[0011] Further, the focal length of the optical lens group is f, and the back focal length of the optical lens group is BFL. f and BFL satisfy the following conditional formula:

[0012] 0 < BFL / f < 3.

[0013] The beneficial effects of the above further solution are as follows: By limiting the ratio of the focal length of the optical lens group to the back focal length to: 0 < BFL / f < 3, the miniaturization of the system can be ensured. When the ratio of the focal length of the optical lens group to the back focal length exceeds the range of the above conditional formula, the back intercept of the system will be too long, which is not conducive to the miniaturization characteristics.

[0014] Further, the focal length of the first lens is f1, and the focal length of the optical lens group is f. f1 and f satisfy the following conditional formula:

[0015] 1 < f1 / f < 3.

[0016] The beneficial effects of the above further solution are as follows: By limiting the ratio of the focal length of the first lens to the focal length of the optical lens group to: 1 < f1 / f < 3, the first lens close to the object plane is a positive lens, providing positive refractive power for the system, focusing the incident light beam, and facilitating the effective transmission of the image information collected by the optical lens group to the image plane.

[0017] Further, the curvature radius of the image side of the third lens is negative, and the curvature radius of the object side of the fourth lens is positive; the distance between the image side of the third lens and the object side of the fourth lens on the optical axis is d 34 , the distance from the projection point of the maximum perimeter of the optical effective area of the image side of the third lens on the optical axis to the projection point of the maximum perimeter of the optical effective area of the object side of the fourth lens on the optical axis is Ed [[ID=..]] 34 , d 34 and Ed 34 satisfy the following conditional formula:

[0018] Ed 34 / d 34 <20.

[0019] The beneficial effect of the above further solution is that the distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, and the distance between the projection point of the maximum periphery of the optically effective area of the image side surface of the third lens on the optical axis and the projection point of the maximum periphery of the optically effective area of the object side surface of the fourth lens on the optical axis are limited to satisfy: Ed 34 / d 34 <20, the degree of curvature of the image-side surface of the third lens and the object-side surface of the fourth lens can be controlled, that is, the curvature of the image-side surface of the third lens and the object-side surface of the fourth lens can be controlled, which is conducive to the miniaturization of the system. At the same time, because the curvature radius of the image-side surface of the third lens is negative and the curvature radius of the object-side surface of the fourth lens is positive, that is, the image-side surface of the third lens and the object-side surface of the fourth lens are both convex surfaces, after the above restrictions are met, it is also possible to avoid excessive curvature of the two convex surfaces while ensuring high pixel density, avoid collision during assembly, and improve assembly yield.

[0020] Furthermore, half of the diagonal length of the effective pixel area on the image plane is ImgH, and the field of view angle of the diagonal direction of the optical lens assembly is FOV. ImgH and FOV satisfy the following conditional formula:

[0021] Tan(FOV / 2) / ImgH>0.15.

[0022] The above further solution has the beneficial effect of limiting the field of view angle between half the diagonal length of the effective pixel area on the image plane and the diagonal direction of the optical lens assembly to satisfy Tan(FOV / 2) / ImgH>0.15, thereby ensuring that the system can expand the imaging range of the camera device while maintaining high pixel count. If the field of view angle between half the diagonal length of the effective pixel area on the image plane and the diagonal direction of the optical lens assembly exceeds the range of the above conditional expression, it is not conducive to the wide-angle and high-pixel characteristics of the system.

[0023] Furthermore, the thickness of the second lens at the optical axis is CT2, and CT2 satisfies the following conditional formula:

[0024] CT2>0.3.

[0025] The beneficial effect of the above further solution is that by limiting the thickness of the second lens at the optical axis to be greater than 0.3, the processability of the lens can be ensured.

[0026] Furthermore, when the wavelength is 960nm, the refractive index of the second lens is n λ2 , the refractive index of the third lens is n λ3 , n λ2 and n λ3 The following conditions are met:

[0027] 0<|n λ3 -n λ2|*100<60.

[0028] The beneficial effect of the above further solution is that when the wavelength is 960nm, the absolute value of the difference between the refractive index of the second lens and the refractive index of the third lens is limited to satisfy: 0<|n λ3 -n λ2 |*100<60 is beneficial to reducing aberration and improving the imaging quality of the imaging system in the short-wave infrared band.

[0029] Furthermore, the Abbe number of the second lens relative to d light is vd2, and the Abbe number of the fifth lens relative to d light is vd5, and vd2 and vd5 satisfy the following conditional formula:

[0030] |vd2-vd5|<50.

[0031] The beneficial effect of the above further solution is that by limiting the absolute value of the difference between the Abbe number of the second lens element with respect to d-light and the Abbe number of the fifth lens element with respect to d-light to less than 50, it is beneficial to correct off-axis chromatic aberration and improve the imaging quality of the optical lens assembly when applied to the visible light band.

[0032] Furthermore, the focal length of the optical lens assembly is f, the entrance pupil diameter of the optical lens assembly is EPD, and f and EPD satisfy the following conditional formula:

[0033] f / EPD≤2.4.

[0034] The above further solution has the beneficial effect of limiting the ratio of the focal length of the optical lens assembly to the entrance pupil diameter of the optical lens assembly to: f / EPD ≤ 2.4, thereby providing a larger entrance pupil and expanding the aperture, thereby improving imaging quality and extending the usable time and space of the carrier. When the ratio of the focal length of the optical lens assembly to the entrance pupil diameter exceeds the upper limit of 2.4, the imaging depth of the system is reduced, the field of view brightness is insufficient, and the clarity of the imaging system is reduced.

[0035] Furthermore, the distortion of the optical lens assembly is Dist, and Dist satisfies the following conditional formula:

[0036] |Dist|<25%.

[0037] The beneficial effect of the above further solution is that by limiting the absolute value of the distortion of the optical lens assembly to less than 25%, the distortion of the entire optical system can be controlled, the system resolution can be improved, and the risk of misjudgment of images shot at larger angles can be reduced.

[0038] Furthermore, the reciprocal of the radius of curvature of the object-side surface of the third lens is cuy s5, the optically effective diameter of the object-side surface of the third lens is map s5, the reciprocal of the radius of curvature of the image-side surface of the third lens is cuy s6, the optically effective diameter of the image-side surface of the third lens is map s6, and cuy s5, map s5, cuy s6, and map s6 satisfy the following conditional formula:

[0039] |(cuy s5)*(map s5)-(cuy s6)*(map s6)| / 2>0.05.

[0040] The beneficial effect of the above further solution is that the reciprocal of the radius of curvature of the object-side surface of the third lens, the optically effective diameter of the object-side surface of the third lens, the reciprocal of the radius of curvature of the image-side surface of the third lens, and the optically effective diameter of the image-side surface of the third lens are limited to satisfy the following conditional formula:

[0041] |(cuy s5)*(map s5)-(cuy s6)*(map s6)| / 2>0.05. By reasonably limiting the curvature and optically effective diameter of the object-side surface of the third lens and the curvature and optically effective diameter of the image-side surface of the third lens, the processing difficulty of the meniscus lens can be controlled, thereby ensuring the process capability of the meniscus lens.

[0042] Furthermore, the curvature radius of the image-side surface of the fifth lens is R s10, and R s10 satisfies the following conditional expression:

[0043] R s10<-20.

[0044] The beneficial effect of the above further solution is that by limiting the curvature radius of the image-side surface of the fifth lens to less than -20, it is beneficial to edge resolution and assembly, reduces decentering, and increases back focus.

[0045] In a second aspect, an embodiment of the present application provides a camera module, comprising any of the above-mentioned optical lens assemblies and an image sensor;

[0046] The optical lens group is used to receive the light signal of the object and project it to the image sensor;

[0047] The image sensor is used to convert light signals into image signals.

[0048] In a third aspect, an embodiment of the present application provides a terminal comprising the above-mentioned camera module.

[0049] The beneficial effects of the embodiments of the present application are as follows: by configuring the first lens of the optical lens assembly to have positive refractive power, the second lens and the fifth lens to have negative refractive power, the curvature radius of the object-side surface of the first lens to be positive, the curvature radius of the image-side surface of the first lens to be negative, and the curvature radius of the object-side surface of the fifth lens to be negative, the camera formed by the optical lens assembly can have advantages such as wide viewing angle, miniaturization, high imaging quality, and high resolution. The optical lens assembly of the embodiments of the present application is suitable for high-pixel cameras used in vehicles, automatic driving, and monitoring devices, etc., and can improve the imaging quality of the optical system, so that the imaging information captured by the camera system is clearly presented at the imaging element position, and details can be captured more clearly and transmitted to the system for automatic recognition. The optical lens assembly of the embodiments of the present application is used in a DMS to accurately and real-time capture driver information for system image analysis, so that when the driver is fatigued or distracted, the DMS can promptly issue an alarm, providing protection for driving safety. When used in monitoring and security, detailed information can also be clearly recorded, providing corresponding technical support and application guarantees in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0051] Figure 1 is a schematic structural diagram of the optical lens assembly provided in Example 1 of the present application;

[0052] Figure 2 is an aberration curve diagram of the optical lens assembly provided in Example 1 of the present application;

[0053] Figure 3 is a field curvature curve diagram of the optical lens assembly provided in Example 1 of the present application;

[0054] Figure 4 is a distortion curve diagram of the optical lens assembly provided in Example 1 of the present application;

[0055] Figure 5 is a schematic structural diagram of the optical lens assembly provided in Example 2 of the present application;

[0056] Figure 6 is an aberration curve diagram of the optical lens assembly provided in Example 2 of the present application;

[0057] Figure 7 is a field curvature curve diagram of the optical lens assembly provided in Example 2 of the present application;

[0058] Figure 8 is a distortion curve diagram of the optical lens assembly provided in Example 2 of the present application;

[0059] Figure 9 is a schematic structural diagram of the optical lens assembly provided in Example 3 of the present application;

[0060] Figure 10 is an aberration curve diagram of the optical lens assembly provided in Example 3 of the present application;

[0061] Figure 11 is a field curvature curve diagram of the optical lens assembly provided in Example 3 of the present application;

[0062] Figure 12 This is a distortion curve diagram of the optical lens assembly provided in Example 3 of the present application. DETAILED DESCRIPTION

[0063] In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

[0064] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0065] The following first explains the aberrations involved in the embodiments of the present application; aberration refers to the inconsistency between the results obtained by non-paraxial ray tracing and the results obtained by paraxial ray tracing in an optical system, and the deviation from the ideal condition of Gaussian optics (first-order approximation theory or paraxial rays). Aberrations are divided into two categories: chromatic aberration and monochromatic aberration. Chromatic aberration is caused by the refractive index of the lens material being a function of the wavelength. When light of different wavelengths passes through the lens, the aberration is caused by the different refractive indices. Chromatic aberration can be divided into positional chromatic aberration and magnification chromatic aberration. Chromatic aberration is a dispersion phenomenon. The so-called dispersion phenomenon refers to the phenomenon that the speed of light or the refractive index in the medium changes with the wavelength of the light wave. The dispersion in which the refractive index of light decreases with the increase of wavelength can be called normal dispersion, and the dispersion in which the refractive index increases with the increase of wavelength can be called negative dispersion (or negative anomalous dispersion). Monochromatic aberrations occur even with highly monochromatic light. Based on their effects, they are categorized as blurring the image and distorting it. The former includes spherical aberration (also known as spherical aberration and astigmatism), while the latter includes field curvature (also known as field curvature and distortion). Coma also includes coma, which occurs when a monochromatic conical beam of light emanating from an off-axis object point toward an optical system, after refraction through the system, fails to converge into a sharp point on an ideal plane, but instead forms a comet-shaped spot with a bright tail.

[0066] In a first aspect, embodiments of the present application provide an imaging optical lens assembly including a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150. The first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 are arranged in sequence along the optical axis from the object plane to the image plane.

[0067] First lens 110 has positive refractive power, with a positive radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The focal length of first lens 110 is f1, and the focal length of the optical lens assembly is f. f1 and f satisfy the following condition: 1 < f1 / f < 3. First lens 110 is located near the object plane. Setting first lens 110 near the object plane as a positive lens, and ensuring that the focal length of first lens 110 satisfies the aforementioned condition, provides the system with positive refractive power, focusing the incident light beam and facilitating the effective transmission of image information collected by the optical lens assembly to the image plane.

[0068] The second lens element 120 has negative refractive power, with a negative radius of curvature on its object-side surface and a positive radius of curvature on its image-side surface. The thickness of the second lens element 120 at the optical axis is CT2, where CT2 satisfies the following condition: CT2 > 0.3. By properly limiting the thickness of the second lens element 120 at the optical axis, the workability of the lens is ensured.

[0069] The third lens element 130 has positive refractive power, and its object-side surface and image-side surface have negative radii of curvature. The reciprocal of the radius of curvature of the object-side surface of the third lens element 130 is cuy s5, and the optically effective diameter of the object-side surface of the third lens element 130 is map s5. The reciprocal of the radius of curvature of the image-side surface of the third lens element 130 is cuy s6, and the optically effective diameter of the image-side surface of the third lens element 130 is map s6. cuy s5, map s5, cuy s6, and map s6 satisfy the following conditional equation: |(cuy s5)*(map s5)-(cuy s6)*(map s6)| / 2>0.05. By reasonably limiting the reciprocal of the radius of curvature of the object-side surface of the third lens 130, the optically effective diameter of the object-side surface of the third lens 130, the reciprocal of the radius of curvature of the image-side surface of the third lens 130, and the optically effective diameter of the image-side surface of the third lens 130, the processing difficulty of the meniscus lens can be controlled and the processing capability of the meniscus lens can be guaranteed.

[0070] The fourth lens 140 has a positive refractive power, and the curvature radius of its object side surface is positive, and the curvature radius of its image side surface is negative. The distance between the image side surface of the third lens 130 and the object side surface of the fourth lens 140 on the optical axis is d 34 The distance between the projection point of the maximum periphery of the optically effective area of the image-side surface of the third lens 130 on the optical axis and the projection point of the maximum periphery of the optically effective area of the object-side surface of the fourth lens 140 on the optical axis is Ed. 34 , d 34 and Ed 34 Satisfy the following conditions: Ed 34 / d 34<20. By reasonably limiting the distance on the optical axis from the image side surface of the third lens 130 to the object side surface of the fourth lens 140, and the distance from the projection point on the optical axis of the maximum periphery of the optically effective area of the image side surface of the third lens 130 to the projection point on the optical axis of the maximum periphery of the optically effective area of the object side surface of the fourth lens 140, the curvature of the image side surface of the third lens 130 and the object side surface of the fourth lens 140 can be controlled, that is, the curvature of the image side surface of the third lens 130 and the object side surface of the fourth lens 140 can be controlled, which is conducive to the miniaturization of the system. At the same time, because the curvature radius of the image side surface of the third lens 130 is negative and the curvature radius of the object side surface of the fourth lens 140 is positive, that is, the image side surface of the third lens 130 and the object side surface of the fourth lens 140 are both convex surfaces, the above-mentioned limitations can also prevent the two convex surfaces from being excessively curved while ensuring high pixel count, avoid collisions during assembly, and improve assembly yield.

[0071] The fifth lens element 150 has negative refractive power, with a negative radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface, or a flat surface. The radius of curvature of the image-side surface of the fifth lens element 150 is Rs10, where Rs10 satisfies the following condition: Rs10 < -20. Limiting the radius of curvature of the image-side surface of the fifth lens element 150 to less than -20 facilitates edge resolution and assembly, reduces decentration, and increases back focus. A flat surface on the image-side surface of the fifth lens element 150 provides even better results, facilitating edge resolution and assembly, reducing decentration, and increasing back focus.

[0072] When the wavelength is 960 nm, the refractive index of the second lens 120 is n λ2 The refractive index of the third lens 130 is n λ3 , n λ2 and n λ3 Satisfy the following conditions: 0<|n λ3 -n λ2 |*100<60. The above reasonable limitation of the absolute value of the difference between the refractive index of the second lens 120 and the refractive index of the third lens 130 at a wavelength of 960 nm is conducive to reducing aberrations and improving the imaging quality of the imaging system in the short-wave infrared band.

[0073] The Abbe number of the second lens element 120 for d-light is vd2, and the Abbe number of the fifth lens element 150 for d-light is vd5. vd2 and vd5 satisfy the following condition: |vd2-vd5|<50. By limiting the absolute value of the difference between the Abbe numbers of the second lens element 120 for d-light and the fifth lens element 150 for d-light to less than 50, this facilitates correction of off-axis chromatic aberration and improves imaging quality when the optical lens assembly is used in the visible light band.

[0074] The refractive power of the above lens may be the refractive power of the lens at the optical axis. The object-side surface of the above lens is the surface of the lens facing the object plane. The image-side surface of the lens is the surface of the lens facing the image plane. A positive radius of curvature of the above surface may mean that the radius of curvature of the surface at the optical axis is positive, or the radius of curvature of the entire surface is positive. A negative radius of curvature of the above surface may mean that the radius of curvature of the surface at the optical axis is negative, or the radius of curvature of the entire surface is negative. A positive radius of curvature indicates that the surface is convex toward the object plane, and a negative radius of curvature indicates that the surface is convex toward the image plane.

[0075] Among the multiple object-side surfaces of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150, and the multiple image-side surfaces of the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150, at least one surface may be aspherical, or all may be spherical. The above-mentioned aspherical surface may refer to the entire surface of the lens being aspherical. The surface may also refer to a portion of the surface being aspherical; for example, the portion near the optical axis may be aspherical.

[0076] Because plastic is low-cost, easy to process, and readily available for producing aspheric surfaces, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 can all be made of plastic. Of course, to improve imaging quality, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, and the fifth lens 150 can also be partially or entirely made of glass. Glass has strong environmental adaptability and a wide temperature range, ensuring high imaging quality.

[0077] To reduce stray light and improve imaging effects, the optical lens assembly may further include a stop. The stop may be an aperture stop and / or a field stop. The stop may be located between the object plane and the image plane. For example, the stop may be located between the object-side surface of the first lens 110 and the object plane, between the image-side surface of the first lens 110 and the object-side surface of the second lens 120, between the image-side surface of the second lens 120 and the object-side surface of the third lens 130, between the image-side surface of the third lens 130 and the object-side surface of the fourth lens 140, between the image-side surface of the fourth lens 140 and the object-side surface of the fifth lens 150, or between the image-side surface of the fifth lens 150 and the image plane. To reduce processing costs, a stop may be provided on any one of the object-side surface of the first lens 110, the object-side surface of the second lens 120, the object-side surface of the third lens 130, the object-side surface of the fourth lens 140, the object-side surface of the fifth lens 150, the image-side surface of the first lens 110, the image-side surface of the second lens 120, the image-side surface of the third lens 130, the image-side surface of the fourth lens 140, and the image-side surface of the fifth lens 150.

[0078] To control the total length of the optical system, half of the diagonal length of the effective pixel region on the image plane ImgH and the total length of the optical system TTL of the optical lens group can satisfy the following conditional formula: 0.1 < ImgH * 2 / TTL < 0.8. By reasonably limiting half of the diagonal length of the effective pixel region on the image plane and the total length of the optical system as above, both the high-pixel imaging quality of the system can be ensured, and the total length of the optical system can be controlled to minimize the volume of the camera composed of this optical lens group. When half of the diagonal length of the effective pixel region on the image plane and the total length of the optical system exceed the range of the above conditional formula, the resolution of the imaging system will decrease, which is not conducive to the characteristics of system miniaturization. The total length of the optical system is the distance from the object side of the first lens 110 to the image plane on the optical axis.

[0079] To ensure the miniaturization of the system, the focal length f of the optical lens group and the back focal length BFL of the optical lens group can satisfy the following conditional formula: 0 < BFL / f < 3. When the ratio of the focal length of the optical lens group to the back focal length exceeds the range of the above conditional formula, the back intercept of the system will be too long, which is not conducive to the characteristics of miniaturization. The back focal length is the minimum distance from the image side of the last lens to the image plane in the direction parallel to the optical axis. That is, the minimum distance from the image side of the fifth lens 150 to the image plane in the direction parallel to the optical axis.

[0080] Half of the diagonal length of the effective pixel region on the image plane is ImgH, and the field angle in the diagonal direction of the optical lens group is FOV. ImgH and FOV satisfy the following conditional formula: Tan(FOV / 2) / ImgH > 0.15. By reasonably limiting half of the diagonal length of the effective pixel region on the image plane and the field angle in the diagonal direction of the optical lens group as above, it can ensure that the shooting range of the imaging device is expanded on the premise of the system having high pixels. When half of the diagonal length of the effective pixel region on the image plane and the field angle in the diagonal direction of the optical lens group exceed the range of the above conditional formula, it is not conducive to the characteristics of wide-angle and high pixels of the system.

[0081] To provide a larger entrance pupil, the focal length f of the optical lens group and the entrance pupil diameter EPD of the optical lens group can satisfy the following conditional formula: f / EPD ≤ 2.4. By reasonably limiting the ratio of the focal length of the optical lens group to the entrance pupil diameter as above, a larger entrance pupil can be provided, the aperture can be expanded, which is beneficial to improving the imaging quality, and at the same time, the usage time and space of the carrier can be expanded. When the ratio of the focal length of the optical lens group to the entrance pupil diameter exceeds the upper limit of 2.4, it is not conducive to the imaging depth of the system, and the field brightness is insufficient, which will reduce the clarity of the imaging system.

[0082] To improve the resolution ability of the system, the distortion amount of the optical lens group is Dist and can satisfy the following conditional formula: |Dist| < 25%, so as to improve the resolution ability of the system and reduce the misjudgment risk of the image taken at a large angle by controlling the distortion amount of the entire optical system.

[0083] To protect each lens, the optical lens assembly may further include a protective glass located between the image plane side of the fifth lens 150 and the image plane.

[0084] To filter non-operating wavelengths, the optical lens assembly may further include a filter element. The filter element may be a filter located between the object plane and the image plane. The filter may be located between the object-side surface and the object plane of the first lens 110, between the image-side surface of the first lens 110 and the object-side surface of the second lens 120, between the image-side surface of the second lens 120 and the object-side surface of the third lens 130, between the image-side surface of the third lens 130 and the object-side surface of the fourth lens 140, between the image-side surface of the fourth lens 140 and the object-side surface of the fifth lens 150, or between the image-side surface and the image plane of the fifth lens 150. To reduce production costs, the filter element may be a filter film coated on any one of the object-side surface of the first lens 110, the object-side surface of the second lens 120, the object-side surface of the third lens 130, the object-side surface of the fourth lens 140, the object-side surface of the fifth lens 150, the image-side surface of the first lens 110, the image-side surface of the second lens 120, the image-side surface of the third lens 130, the image-side surface of the fourth lens 140, and the image-side surface of the fifth lens 150.

[0085] The camera formed by the optical lens assembly of the embodiment of the present application has the advantages of wide viewing angle, low sensitivity, miniaturization, and high imaging quality; when used in the ADAS system, it can accurately and in real time capture road information (detecting objects, detecting light sources, detecting road signs, etc.) and provide the system with image analysis to provide protection for autonomous driving safety; when used in driving recording, it can provide the driver with a clear field of view and provide protection for the driver's safe driving; when used in monitoring and security, it can also clearly record detailed information.

[0086] The following will describe the imaging optical lens assembly in detail with reference to specific parameters.

[0087] Example 1

[0088] See the schematic structural diagram of the imaging optical lens assembly according to the embodiment of the present application. Figure 1The optical lens assembly includes an aperture (attached to the object-side surface of the first lens element 110, not shown in the figure), arranged in sequence along the optical axis from the object plane to the image plane, the first lens element 110, the second lens element 120, the third lens element 130, the aperture 180, the fourth lens element 140, the fifth lens element 150, and a cover glass. The first lens element 110 has positive refractive power, with a positive radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The second lens element 120 has negative refractive power, with a negative radius of curvature on its object-side surface and a positive radius of curvature on its image-side surface. The third lens element 130 has positive refractive power, with a negative radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The fourth lens element 140 has positive refractive power, with a positive radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The fifth lens element 150 has negative refractive power, with a negative radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface.

[0089] In the embodiment of the present application, the relevant parameters of the optical lens assembly are shown in Table 1, taking light with a wavelength of 960 nm as a reference. In Table 1, f is the focal length of the optical lens assembly, FNO represents the aperture value, and 1 / 2FOV represents half the field of view angle in the diagonal direction of the optical lens assembly. The units of focal length, curvature radius, and thickness are all millimeters.

[0090] Table 1

[0091]

[0092] As can be seen from Table 1 above, the relationship between the focal length f1 of the first lens 110 and the focal length f of the optical lens assembly in the embodiment of the present application is: f1 / f=1.83.

[0093] The thickness CT2 of the second lens 120 at the optical axis satisfies: CT2 = 0.50.

[0094] The reciprocal of the radius of curvature of the object-side surface of the third lens 130 cuy s5, the optically effective diameter of the object-side surface of the third lens 130 map s5, the reciprocal of the radius of curvature of the image-side surface of the third lens 130 cuy s6, and the optically effective diameter of the image-side surface of the third lens 130 satisfy: |(cuy s5)*(map s5)-(cuy s6)*(map s6)| / 2=0.16.

[0095] The curvature radius R s10 of the image-side surface of the fifth lens 150 satisfies: R s10 = -85.40.

[0096] When the wavelength is 960 nm, the refractive index n of the second lens 120 is λ2 The refractive index n of the third lens 130 is λ3 The relationship between them is: λ3 -n λ2 |*100=49.00.

[0097] The relationship between the Abbe number vd2 of the second lens 120 with respect to d light and the Abbe number vd5 of the fifth lens 150 with respect to d light is: |vd2-vd5|=16.90.

[0098] The distance d between the third lens 130 and the fourth lens 140 on the optical axis 34 , the peripheral distance Ed between the third lens 130 and the fourth lens 140 at the maximum effective diameter 34 The relationship between them is: Ed 34 / d 34 =12.25.

[0099] The relationship between half of the diagonal length of the effective pixel area on the image plane ImgH and the total optical system length TTL of the optical lens assembly is: ImgH*2 / TTL=0.52.

[0100] The relationship between the focal length f of the optical lens assembly and the optical back focus BFL of the optical lens assembly is: BFL / f=0.42.

[0101] The relationship between half of the diagonal length of the effective pixel area on the image plane ImgH and the field of view FOV in the diagonal direction of the optical lens assembly is: Tan(FOV / 2) / ImgH=0.21.

[0102] The relationship between the focal length f of the optical lens assembly and the entrance pupil diameter EPD of the optical lens assembly is: f / EPD=2.1.

[0103] The distortion amount of the optical lens assembly is Dist, which satisfies: |Dist|=12.0%.

[0104] Figure 2 The spherical aberration curves of the light at wavelengths of 950.0000nm, 960.0000nm and 970.0000nm are shown in the embodiment of the present application. Figure 2 It can be seen that the spherical aberration corresponding to the wavelengths of 950.0000 nm, 960.0000 nm and 970.0000 nm are all within 0.008 mm, indicating that the imaging quality of the embodiment of the present application is good.

[0105] Figure 3 is a field curvature curve diagram of the embodiment of the present application, Figure 3 It can be seen that the field curvature is within 0.050 mm and is well compensated. Figure 4 is a distortion curve diagram of the embodiment of the present application, Figure 4 It can be seen that the distortion is also well corrected.

[0106] Example 2

[0107] See the schematic structural diagram of the imaging optical lens assembly according to the embodiment of the present application. Figure 5The optical lens assembly includes an aperture (attached to the object-side surface of the first lens 110, not shown in the figure), which is arranged in sequence along the optical axis from the object plane to the image plane, the first lens 110, the second lens 120, the third lens 130, the aperture 180, the fourth lens 140, the fifth lens 150, and a protective glass. The first lens 110 has positive refractive power, with a positive radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The second lens 120 has negative refractive power, with a negative radius of curvature on its object-side surface and a positive radius of curvature on its image-side surface. The third lens 130 has positive refractive power, with a negative radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The fourth lens 140 has positive refractive power, with a positive radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The fifth lens 150 has negative refractive power, with a negative radius of curvature on its object-side surface and a flat image-side surface.

[0108] In the embodiment of the present application, the relevant parameters of the optical lens assembly are shown in Table 2, taking light with a wavelength of 960 nm as a reference. In Table 2, f is the focal length of the optical lens assembly, FNO represents the aperture value, and 1 / 2FOV represents half the field of view angle in the diagonal direction of the optical lens assembly. The units of focal length, curvature radius, and thickness are all millimeters.

[0109] Table 2

[0110]

[0111] As can be seen from Table 2 above, the relationship between the focal length f1 of the first lens 110 and the focal length f of the optical lens assembly in the embodiment of the present application is: f1 / f=1.81.

[0112] The thickness CT2 of the second lens 120 at the optical axis satisfies: CT2 = 0.50.

[0113] The reciprocal of the radius of curvature of the object-side surface of the third lens 130 cuy s5, the optically effective diameter of the object-side surface of the third lens 130 map s5, the reciprocal of the radius of curvature of the image-side surface of the third lens 130 cuy s6, and the optically effective diameter of the image-side surface of the third lens 130 satisfy: |(cuy s5)*(map s5)-(cuy s6)*(map s6)| / 2=0.18.

[0114] The curvature radius R s10 of the image-side surface of the fifth lens 150 satisfies: R s10 = infinity.

[0115] When the wavelength is 960 nm, the refractive index n of the second lens 120 is λ2 The refractive index n of the third lens 130 is λ3 The relationship between them is: λ3 -n λ2 |*100=46.00.

[0116] The relationship between the Abbe number vd2 of the second lens 120 with respect to d light and the Abbe number vd5 of the fifth lens 150 with respect to d light is: |vd2-vd5|=40.40.

[0117] The distance d between the third lens 130 and the fourth lens 140 on the optical axis 34 , the peripheral distance Ed between the third lens 130 and the fourth lens 140 at the maximum effective diameter 34 The relationship between them is: Ed 34 / d 34 =13.33.

[0118] The relationship between half of the diagonal length of the effective pixel area on the image plane ImgH and the total optical system length TTL of the optical lens assembly is: ImgH*2 / TTL=0.53.

[0119] The relationship between the focal length f of the optical lens assembly and the optical back focus BFL of the optical lens assembly is: BFL / f=0.45.

[0120] The relationship between half of the diagonal length of the effective pixel area on the image plane ImgH and the field of view FOV in the diagonal direction of the optical lens assembly is: Tan(FOV / 2) / ImgH=0.23.

[0121] The relationship between the focal length f of the optical lens assembly and the entrance pupil diameter EPD of the optical lens assembly is: f / EPD=2.1.

[0122] The distortion amount of the optical lens assembly is Dist, which satisfies: |Dist|=14.5%.

[0123] Figure 6 The spherical aberration curves of the light at wavelengths of 950.0000nm, 960.0000nm and 970.0000nm are shown in the embodiment of the present application. Figure 6 It can be seen that the spherical aberration corresponding to the wavelengths of 950.0000 nm, 960.0000 nm and 970.0000 nm are all within 0.02 mm, indicating that the imaging quality of the embodiment of the present application is good.

[0124] Figure 7 is a field curvature curve diagram of the embodiment of the present application, Figure 7 It can be seen that the field curvature is within 0.050 mm and is well compensated. Figure 8 is a distortion curve diagram of the embodiment of the present application, Figure 8 It can be seen that the distortion is also well corrected.

[0125] Example 3

[0126] See the schematic structural diagram of the imaging optical lens assembly according to the embodiment of the present application. Figure 9The optical lens assembly includes an aperture (attached to the object-side surface of the first lens element 110, not shown in the figure), arranged in sequence along the optical axis from the object plane to the image plane, the first lens element 110, the second lens element 120, the third lens element 130, the aperture 180, the fourth lens element 140, the fifth lens element 150, and a cover glass. The first lens element 110 has positive refractive power, with a positive radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The second lens element 120 has negative refractive power, with a negative radius of curvature on its object-side surface and a positive radius of curvature on its image-side surface. The third lens element 130 has positive refractive power, with a negative radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The fourth lens element 140 has positive refractive power, with a positive radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface. The fifth lens element 150 has negative refractive power, with a negative radius of curvature on its object-side surface and a negative radius of curvature on its image-side surface.

[0127] In the embodiment of the present application, the relevant parameters of the optical lens assembly are shown in Table 3, taking light with a wavelength of 960 nm as a reference. In Table 3, f is the focal length of the optical lens assembly, FNO represents the aperture value, and 1 / 2FOV represents half the field of view angle in the diagonal direction of the optical lens assembly. The units of focal length, curvature radius, and thickness are all millimeters.

[0128] Table 3

[0129]

[0130] As can be seen from Table 3 above, the relationship between the focal length f1 of the first lens 110 and the focal length f of the optical lens assembly in the embodiment of the present application is: f1 / f=1.54.

[0131] The thickness CT2 of the second lens 120 at the optical axis satisfies: CT2 = 0.50.

[0132] The reciprocal of the radius of curvature of the object-side surface of the third lens 130 cuy s5, the optically effective diameter of the object-side surface of the third lens 130 map s5, the reciprocal of the radius of curvature of the image-side surface of the third lens 130 cuy s6, and the optically effective diameter of the image-side surface of the third lens 130 satisfy: |(cuy s5)*(map s5)-(cuy s6)*(map s6)| / 2=0.17.

[0133] The curvature radius R s10 of the image-side surface of the fifth lens 150 satisfies: R s10 = -85.40.

[0134] When the wavelength is 960 nm, the refractive index n of the second lens 120 is λ2 The refractive index n of the third lens 130 is λ3 The relationship between them is: λ3 -n λ2 |*100=46.00.

[0135] The relationship between the Abbe number vd2 of the second lens 120 with respect to d light and the Abbe number vd5 of the fifth lens 150 with respect to d light is: |vd2-vd5|=39.50.

[0136] The distance d between the third lens 130 and the fourth lens 140 on the optical axis 34 , the peripheral distance Ed between the third lens 130 and the fourth lens 140 at the maximum effective diameter 34 The relationship between them is: Ed 34 / d 34 =11.67.

[0137] The relationship between half of the diagonal length of the effective pixel area on the image plane ImgH and the total optical system length TTL of the optical lens assembly is: ImgH*2 / TTL=0.54.

[0138] The relationship between the focal length f of the optical lens assembly and the optical back focus BFL of the optical lens assembly is: BFL / f=0.46.

[0139] The relationship between half of the diagonal length of the effective pixel area on the image plane ImgH and the field of view FOV in the diagonal direction of the optical lens assembly is: Tan(FOV / 2) / ImgH=0.26.

[0140] The relationship between the focal length f of the optical lens assembly and the entrance pupil diameter EPD of the optical lens assembly is: f / EPD=2.4.

[0141] The distortion amount of the optical lens assembly is Dist, which satisfies: |Dist|=13.0%.

[0142] Figure 10 The spherical aberration curves of the light at wavelengths of 950.0000nm, 960.0000nm and 970.0000nm are shown in the embodiment of the present application. Figure 10 It can be seen that the spherical aberration corresponding to the wavelengths of 950.0000 nm, 960.0000 nm and 970.0000 nm are all within 0.008 mm, indicating that the imaging quality of the embodiment of the present application is good.

[0143] Figure 11 is a field curvature curve diagram of the embodiment of the present application, Figure 11 It can be seen that the field curvature is within 0.050 mm and is well compensated. Figure 12 is a distortion curve diagram of the embodiment of the present application, Figure 12 It can be seen that the distortion is also well corrected.

[0144] In a second aspect, embodiments of the present application provide a camera module comprising any of the aforementioned optical lens assemblies and an image sensor. The optical lens assembly is configured to receive a light signal from a subject and project it onto the image sensor. The image sensor is configured to convert the light signal into an image signal.

[0145] In a third aspect, embodiments of the present application provide a terminal comprising the aforementioned camera module. The terminal can be any device capable of capturing images. For example, the terminal can be a smartphone, wearable device, computer, television, vehicle, camera, surveillance device, etc. The camera module cooperates with the terminal to capture and reproduce images of a target object.

[0146] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0147] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. An optical lens assembly, characterized in that: It is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis from the object plane to the image plane; wherein, The first lens has positive refractive power, the radius of curvature of the object-side surface of the first lens is positive, and the radius of curvature of the image-side surface of the first lens is negative; The second lens has negative refractive power, the radius of curvature of the object-side surface of the second lens is negative, and the radius of curvature of the image-side surface of the second lens is positive; The third lens has positive refractive power, the object-side surface of the third lens has a negative curvature radius, and the image-side surface of the third lens has a negative curvature radius; The fourth lens has positive refractive power, the curvature radius of the object-side surface of the fourth lens is positive, and the curvature radius of the image-side surface of the fourth lens is negative; The fifth lens element has negative refractive power, and the curvature radius of the object-side surface of the fifth lens element is negative.

2. The optical lens assembly according to claim 1, characterized in that Half of the diagonal length of the effective pixel area on the image plane is ImgH, the total optical system length of the optical lens assembly is TTL, and ImgH and TTL satisfy the following conditional formula: 0.1<ImgH*2 / TTL<0.

8.

3. The optical lens assembly according to claim 1, wherein: The focal length of the optical lens assembly is f, the optical back focus of the optical lens assembly is BFL, and f and BFL satisfy the following conditional formula: 0<BFL / f<3.

4. The optical lens assembly according to claim 1, characterized in that The focal length of the first lens is f1, the focal length of the optical lens assembly is f, and f1 and f satisfy the following conditional formula: 1<f1 / f<3.

5. The optical lens assembly according to claim 1, wherein: The distance between the image-side surface of the third lens and the object-side surface of the fourth lens on the optical axis is d34, and the distance between the projection point of the maximum periphery of the optically effective area of the image-side surface of the third lens on the optical axis and the projection point of the maximum periphery of the optically effective area of the object-side surface of the fourth lens on the optical axis is Ed34. d34 and Ed34 satisfy the following conditional formula: 11.67≤Ed34 / d34<20.

6. The optical lens assembly according to claim 1, characterized in that Half of the diagonal length of the effective pixel area on the image plane is ImgH, and the field of view angle of the diagonal direction of the optical lens assembly is FOV. ImgH and FOV satisfy the following conditional formula: 0.15<Tan(FOV / 2) / ImgH≤0.

26.

7. The optical lens assembly according to claim 1, characterized in that The thickness of the second lens at the optical axis is CT2, and CT2 satisfies the following conditional formula: 0.3<CT2≤0.

5.

8. The optical lens assembly according to claim 1, characterized in that When the wavelength is 960 nm, the refractive index of the second lens is nλ2, the refractive index of the third lens is nλ3, and nλ2 and nλ3 satisfy the following conditional formula: 0<|nλ3- nλ2|*100<30.

9. The optical lens assembly according to claim 1, characterized in that The Abbe number of the second lens relative to d light is vd2, the Abbe number of the fifth lens relative to d light is vd5, and vd2 and vd5 satisfy the following conditional formula: |vd2- vd5|<30.

10. The optical lens assembly according to claim 1, characterized in that The focal length of the optical lens assembly is f, the entrance pupil diameter of the optical lens assembly is EPD, and f and EPD satisfy the following conditional formula: 2.1≤f / EPD≤2.

4.

11. The optical lens assembly according to claim 1, characterized in that The distortion of the optical lens assembly is Dist, and Dist satisfies the following conditional formula: ∣Dist∣<25%.

12. The optical lens assembly according to claim 1, characterized in that The reciprocal of the curvature radius of the object-side surface of the third lens is cuy s5, the optically effective diameter of the object-side surface of the third lens is map s5, the reciprocal of the curvature radius of the image-side surface of the third lens is cuy s6, the optically effective diameter of the image-side surface of the third lens is map s6, and cuy s5, maps5, cuy s6, and map s6 satisfy the following conditional formula: 0.05<∣(cuy s5) *(map s5)-(cuy s6)*(map s6)∣ / 2≤0.

18.

13. The optical lens assembly according to claim 1, characterized in that The curvature radius of the image-side surface of the fifth lens is Rs10, and Rs10 satisfies the following conditional formula: Rs10<-20.

14. A camera module, characterized in that: comprising the optical lens assembly and image sensor according to any one of claims 1 to 13; The optical lens assembly is used to receive the light signal of the object being photographed and project it onto the image sensor; The image sensor is used to convert the optical signal into an image signal.

15. A terminal, characterized in that: Including the camera module described in claim 14.

Images