Vehicle-mounted imaging lens and electronic equipment

Abstract

The vehicle-mounted imaging lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged in the direction from the object side to the image side along the optical axis, the first lens has negative focal power, the object side face of the first lens is a convex face, and the image side face of the first lens is a concave face; the second lens has positive focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface or a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface or a convex surface; and a fourth lens having a positive refractive power, etc. The lens adopts the structural design of five lenses, the low-order aberration of the lens can be effectively balanced by optimizing the positions, the shapes, the focal power and the like of the lenses and reasonably controlling the positive and negative matching of the focal power of each lens of the lens, meanwhile, the tolerance sensitivity of the lens can be reduced, and the imaging quality of the lens is ensured while the miniaturization of the lens is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted imaging lenses, and in particular to a vehicle-mounted imaging lens and electronic equipment. Background Art

[0002] The vehicle-mounted imaging lens is mainly installed on the B-pillar of the vehicle cabin. It recognizes the palm veins through the vehicle-mounted imaging lens, and then interacts with the vehicle to complete commands such as unlocking and automatically opening the door. However, most existing vehicle-mounted imaging lenses have one or more of the following defects:

[0003] First, the general vehicle-mounted lens has a small light transmission, and the image quality is low in low-light environments, which cannot meet the resolution requirements of vehicle-mounted lenses;

[0004] Second, general automotive lenses use relatively expensive optical materials, and the lens production cost is high;

[0005] Third, the general automotive lens has complex optical composition and processing technology, high lens production cost and low yield;

[0006] Fourth, the reliability requirements of general automotive lenses cannot be met, such as dustproof to IP6KX, waterproof to IPX7, and stone impact resistance to IP9K;

[0007] Fifth, the general lens uses more lenses, the optical assembly yield is low, and the lens length is long;

[0008] Sixth, general lenses tend to shift focus at high and low temperatures, and cannot meet the requirement of maintaining clear imaging under the actual operating temperature environment of vehicle-mounted lenses.

[0009] Seventh, when a general lens faces stray light and ghosting problems, the ratio of the stray light illumination to the light source illumination is greater than 10. -5 , which usually cannot meet the strict requirements of vehicle-mounted lenses. Especially during the use of vehicle-mounted lenses, they may be exposed to direct sunlight or strong reflected light from the surface of other objects with high reflectivity. This excessive reflected sunlight will cause image quality to deteriorate, produce obvious stray light and ghost images, and affect driving safety. Summary of the invention

[0010] In view of this, the purpose of the present invention is to provide a vehicle-mounted imaging lens and electronic equipment. The lens can solve at least one technical disadvantage mentioned in the background technology.

[0011] According to one aspect of the present invention, there is provided a vehicle-mounted imaging lens, 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 side to an image side, wherein: the first lens has a negative optical focal length, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has a positive optical focal length, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface or a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface or a convex surface; the fourth lens has a positive optical focal length, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has a positive optical focal length, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface. The lens of the present invention adopts a five-lens structural design. By optimizing the lens position, shape and optical focal length, and by reasonably controlling the positive and negative collocation of the optical focal length of each lens, the low-order aberrations of the lens can be effectively balanced, and the sensitivity of the lens tolerance can be reduced, thereby maintaining the miniaturization of the lens while ensuring the imaging quality of the lens.

[0012] According to another aspect of the present invention, an electronic device is provided, according to the above-mentioned vehicle-mounted imaging lens; and an image sensor, which is configured to receive an image formed by the vehicle-mounted imaging lens. In this technical solution, the advantages of the electronic device depend on the vehicle-mounted imaging lens, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a structural diagram of the optical system of the lens in Example 1.

[0015] Figure 2 This is the MTF diagram of the lens in Example 1 at 850nm in the near infrared band.

[0016] Figure 3 This is a distortion diagram of the lens in Example 1 at 850nm in the near-infrared band.

[0017] Figure 4 It is the relative illumination of the lens in Example 1 at 850nm in the near infrared band.

[0018] Figure 5 This is a structural diagram of the optical system of the lens in Example 2.

[0019] Figure 6 This is the MTF diagram of the lens in Example 2 at 850nm in the near-infrared band.

[0020] Figure 7 This is a distortion diagram of the lens in Example 2 at 850nm in the near-infrared band.

[0021] Figure 8 It is the relative illumination of the lens in Example 2 at 850nm in the near infrared band.

[0022] Fig. 9 This is a structural diagram of the optical system of the lens in Example 3.

[0023] Fig.10 This is the MTF diagram of the lens in Example 3 at 850nm in the near-infrared band.

[0024] Fig.11 This is a distortion diagram of the lens in Example 3 at 850nm in the near-infrared band.

[0025] Fig.12 It is the relative illumination of the lens in Example 3 at 850nm in the near infrared band.

[0026] Fig.13 It is a schematic diagram of the structure of the electronic device of the present invention.

[0027] L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; ST, aperture; CG, filter; G, protective glass; I MA, imaging surface. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention. Similarly, the following examples are only partial embodiments of the present invention rather than all embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0029] The object of the present invention is to provide a vehicle-mounted imaging lens, 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 side to an image side, wherein:

[0030] The first lens has negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave;

[0031] The second lens has positive power, the object side surface of the second lens is convex, and the image side surface of the second lens is convex or concave;

[0032] The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface or a convex surface;

[0033] The fourth lens has positive power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex;

[0034] The fifth lens has positive power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface or a concave surface.

[0035] The lens of the present invention adopts a five-lens structural design. By optimizing the lens position, shape and optical focal length, and by reasonably controlling the positive and negative collocation of the optical focal length of each lens, the low-order aberrations of the lens can be effectively balanced, and the sensitivity of the lens tolerance can be reduced, thereby maintaining the miniaturization of the lens while ensuring the imaging quality of the lens.

[0036] Among them, refer to Figure 1 , Figure 5 , Fig. 9 In the figure, the first lens is denoted by L1, the second lens is denoted by L2, the third lens is denoted by L3, the fourth lens is denoted by L4, the fifth lens is denoted by L5, the aperture is denoted by ST, the filter is denoted by G, the protective glass is denoted by G, and the imaging surface is denoted by I MA.

[0037] As an embodiment, the lens satisfies the following relationship: Nd1>1.9; Vd1<40; wherein Nd1 is the refractive index of the first lens, and Vd1 is the Abbe coefficient of the first lens. The beneficial effect of this embodiment is that by satisfying the above relationship, the optical large aperture ratio can be ensured, which is conducive to compressing the front aperture of the lens optical system to achieve miniaturization of the lens.

[0038] As an embodiment, the lens satisfies the following relationship: the impact strength of the first lens is greater than 2.5KJ / m^2, and the Knoop hardness is greater than 650HK. The beneficial effect of this embodiment is that since the first lens is the first glass lens of the lens, it is installed on the B-pillar of the cabin, and the first lens is exposed to the outside and in contact with the air, so in the design stage, it is also necessary to consider improving the automotive-grade trustworthiness and reliability of the lens, which can meet the automotive-grade reliability tests such as falling balls and gravel falling. Therefore, in the design stage, it is also necessary to consider the mechanical properties and chemical stability of the first glass material. It is more preferable to select H-ZLAF4LB (the impact strength of this material is 2.72J / m^2, and the Knoop hardness is 707HK) or H-ZLAF72 (the impact strength of this material is 2.82J / m^2, and the Knoop hardness is 663HK) as the material of the first lens.

[0039] As an embodiment, the lens satisfies the following relationship: Nd2>1.9; Vd2<40; wherein Nd2 is the refractive index of the second lens, and Vd2 is the Abbe coefficient of the second lens. The beneficial effect of this embodiment is that the second lens is a positive refractive power lens, which has a prism deflection effect, and is used to receive the large-angle light passing through the first lens and converge it to the aperture direction. By satisfying the above relationship, the second lens can make the incident angle of the edge field light on the subsequent optical element smaller, realize the imaging range of a large field of view, make the optical system compact and small in size, and is very helpful to reduce the space occupied by the entire optical system.

[0040] As an embodiment, the lens satisfies the following relationship: 1.55<Nd4<1.65; Vd4<69; in the temperature range of -40℃~105℃, dn / dT<-6*10E-6; wherein Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe coefficient of the fourth lens, and dn / dT is the refractive index temperature coefficient of the fourth lens. The beneficial effect of this embodiment is that the fourth lens adopts a material with a special refractive index temperature coefficient and satisfies the above relationship, which can effectively reduce the imaging surface offset caused by thermal expansion and contraction, so that the lens does not need additional focusing at different temperatures, and the imaging performance of the imaging lens at different temperatures is increased. The consistency is clear, so as to balance the temperature drift and achieve the purpose of athermalization of the lens.

[0041] As an embodiment, the lens satisfies the following relationship: Nd5>1.9; Vd5<30; wherein Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe coefficient of the fifth lens. The beneficial effect of this embodiment is that by satisfying the above relationship, it is beneficial to optimize the optical performance of the lens, improve the imaging resolution, and also effectively reduce the outer diameter of the rear end of the lens. Through this design, the lens can meet the specification requirements of the M8 threaded interface, thereby enhancing its versatility in application in a variety of imaging systems. The application of high refractive index materials enables the lens to achieve a more compact size design while maintaining high optical performance, which is of great significance for improving the integration and portability of the system. In addition, the compatibility of the M8 threaded interface enables the lens to be easily adapted to a variety of standard cameras and imaging devices, thereby broadening its scope of application in different optical systems.

[0042] The present invention provides three embodiments. In embodiments 1 and 2, the first lens, the second lens and the third lens form a first combined lens, the fourth lens and the fifth lens form a second combined lens, and a stop is provided between the first combined lens and the second combined lens. In embodiment 3, the first lens and the second lens form a first combined lens, the third lens, the fourth lens and the fifth lens form a second combined lens, and a stop is provided between the first combined lens and the second combined lens.

[0043] The lens satisfies the following relationship: -1.5<f1 / f2<-1; wherein f1 is the focal length of the first combined lens, and f2 is the focal length of the second combined lens. The beneficial effect of this embodiment is that by satisfying the above relationship, the optical power distribution of the first combined lens and the second combined lens is good, the tolerance of the entire optical system is large, and the lens yield is improved.

[0044] The lens satisfies the following relationship: -2<f1 / f<-1; wherein f1 is the focal length of the first combined lens, and f is the total focal length of the lens. The beneficial effect of this embodiment is that by satisfying the above relationship, the light can pass through the aperture at a gentle angle, reducing the tolerance sensitivity and improving the stability of the optical system before and after, while realizing the miniaturization of the entire optical lens. The above conditions limit the first combined lens to have a negative focal power, which has a divergent effect on the light, and is mainly used to receive the light incident from the wide-angle lens and correct some aberrations of the optical system.

[0045] The lens satisfies the following relationship: 1<f2 / f<1.5; wherein f2 is the focal length of the second combined lens, and f is the total focal length of the lens. The beneficial effect of this embodiment is that by satisfying the above relationship, the second combined lens can effectively bear the focal length distribution of the optical lens, which is not only beneficial to the aberration balance between the first combined lens and the second combined lens, thereby facilitating the reduction of the length of the optical lens, but also realizing the miniaturization of the entire optical lens.

[0046] The lens satisfies the following relationship: 0.35<H / TTL<0.4, where H is the lens image height and TTL is the lens optical length. The beneficial effect of this embodiment is that by satisfying the above relationship, it is beneficial for the optical lens to achieve both miniaturization design and improved imaging quality.

[0047] The lens satisfies the following relationship: 0.2<BFL / TTL<0.4, where BFL is the optical back focus of the lens and TTL is the total optical length of the lens. The beneficial effect of this embodiment is that by satisfying the above relationship, it is beneficial to achieve both the purpose of improving the relative illumination of the lens optical system and the purpose of miniaturization design.

[0048] In summary, the beneficial effects of the present invention are as follows:

[0049] First, the aperture FNO of the lens of the present invention reaches 2.0. Theoretically, the larger the FNO value (the inverse of the relative aperture), the lower the system brightness, that is, the less light entering the system, which makes the image look dark and affects the recognition of small objects. Therefore, the present invention reduces the waiting time of the vehicle computer by virtue of the excellent low-light processing capability brought by the large aperture and the fast palmprint recognition capability brought by the small depth of field.

[0050] Secondly, the lens of the present invention is composed of 5 pieces of spherical glass lenses, has a simple structure, is suitable for modern automated optical installation conditions, and takes into account the tolerance limit of the entire optical system, and has a high mass production yield of the lens.

[0051] Third, during the optical design stage, the lens of the present invention can meet the extremely high reliability requirements of vehicle-mounted optical lenses through reasonable optical power distribution and lens shape selection.

[0052] Fourthly, the first lens of the present invention uses an optical lens material with excellent mechanical properties and chemical stability, and with reasonable lens center thickness and edge thickness, it can meet the requirements of the optical lens for anti-stone impact, as well as dustproof and waterproof requirements.

[0053] Fifth, the present invention satisfies the temperature drift requirement of -40°C to 85°C by reasonably allocating the refractive index, temperature coefficient, positive and negative focal length of the lens, thereby realizing the athermal design of the optical lens.

[0054] Sixth, the lens of the present invention performs excellently in ghost image control, the ghost image energy is small, and the occupied pixels and target surface area are small.

[0055] The present invention will be described in more detail below in conjunction with the following tables. It should be noted that the following tables are only specific embodiments of the present invention, rather than limiting examples.

[0056] For the optical structure of Example 1, please refer to Figure 1 Specific parameters of this embodiment 1 are shown in the following table 1. In this embodiment 1, the focal length of the lens f=2.37mm, the light clearance FNO=2.0, the field of view angle FOV=130°, the target surface size I MH=4.62mm, and the total length TTL=12mm.

[0057] Table 1 - Lens parameters of Example 1

[0058] Surface number type Radius of curvature thickness Refractive Index Abbe coefficient Lens focal length 1 First lens 35.715 1.00 1.9108 35.282 -2.21 2 1.839 0.66 3 Second lens 5.349 1.40 1.9108 35.282 5.59 4 Infinity 0.08 5 The third lens 7.661 1.08 1.6223 53.171 -16.25 6 4.098 0.18 7 Aperture Infinity 0.08 8 The fourth lens 27.227 1.83 1.5928 68.342 4.83 9 -3.080 0.08 10 Fifth lens 11.673 1.30 2.0007 25.426 5.60 11 -9.631 0.50 12 Optical Filters Infinity 0.30 1.5168 64.199 13 Infinity 2.69 14 Protective glass Infinity 0.40 1.5168 64.199 15 Infinity 0.42 16 Imaging surface Infinity -

[0059] For the convenience of description, in Table 1: surface number 1 and surface number 2 are the object side surface and image side surface of the first lens, respectively; surface number 3 and surface number 4 are the object side surface and image side surface of the second lens, respectively; surface number 5 and surface number 6 are the object side surface and image side surface of the third lens, respectively; surface number 7 is the surface of the aperture; surface number 8 and surface number 9 are the object side surface and image side surface of the fourth lens, respectively; surface number 10 and surface number 11 are the object side surface and image side surface of the fifth lens, respectively; surface number 12 and surface number 13 are the object side surface and image side surface of the filter, respectively; surface number 14 and surface number 15 are the object side surface and image side surface of the protective glass; surface number 16 is the surface of the imaging surface.

[0060] According to Table 1, the conditional formula of Example 1 of the present invention can be read as follows:

[0061] (1) The refractive index of the first lens Nd1 = 1.9108; the Abbe coefficient of the first lens Vd1 = 35.282;

[0062] (2) The refractive index of the second lens Nd2 = 1.9108; The Abbe coefficient of the second lens Vd2 = 35.282;

[0063] (3) The refractive index of the fourth lens Nd4=1.5928; The Abbe coefficient of the fourth lens Vd4=68.342;

[0064] (4) The refractive index of the fifth lens Nd5=2.0007; The Abbe coefficient of the fifth lens Vd5=25.426.

[0065] For the optical structure of Example 2, please refer to Figure 5 Specific parameters of this embodiment 2 are shown in the following table 2. In this embodiment 2, the focal length of the lens f=2.37mm, the light clearance FNO=2.0, the field of view angle FOV=125°, the target surface size I MH=4.62mm, and the total length TTL=12mm.

[0066] Table 2 - Lens parameters of Example 2

[0067]

[0068]

[0069] For the convenience of description, in Table 2: surface number 1 and surface number 2 are the object side surface and image side surface of the first lens, respectively; surface number 3 and surface number 4 are the object side surface and image side surface of the second lens, respectively; surface number 5 and surface number 6 are the object side surface and image side surface of the third lens, respectively; surface number 7 is the surface of the aperture; surface number 8 and surface number 9 are the object side surface and image side surface of the fourth lens, respectively; surface number 10 and surface number 11 are the object side surface and image side surface of the fifth lens, respectively; surface number 12 and surface number 13 are the object side surface and image side surface of the filter, respectively; surface number 14 and surface number 15 are the object side surface and image side surface of the protective glass; surface number 16 is the surface of the imaging surface.

[0070] According to Table 2, the conditional formula of Embodiment 2 of the present invention can be read as follows:

[0071] (1) The refractive index of the first lens Nd1 = 1.9108; the Abbe coefficient of the first lens Vd1 = 35.282;

[0072] (2) The refractive index of the second lens Nd2 = 1.9037; The Abbe coefficient of the second lens Vd2 = 31.315;

[0073] (3) The refractive index of the fourth lens Nd4=1.5928; The Abbe coefficient of the fourth lens Vd4=68.342;

[0074] (4) The refractive index of the fifth lens Nd5=2.0007; The Abbe coefficient of the fifth lens Vd5=25.426.

[0075] For the optical structure of Example 3, please refer to Fig. 9 Specific parameters of this embodiment 3 are shown in the following table 3. In this embodiment 3, the focal length of the lens f=2.37mm, the light clearance FNO=2.0, the field of view angle FOV=129°, the target surface size I MH=4.32mm, and the total length TTL=12mm.

[0076] Table 3 - Lens parameters of Example 3

[0077]

[0078]

[0079] For the convenience of description, in Table 3: surface number 1 and surface number 2 are the object side surface and image side surface of the first lens respectively; surface number 3 and surface number 4 are the object side surface and image side surface of the second lens respectively; surface number 5 is the surface of the aperture; surface number 6 and surface number 7 are the object side surface and image side surface of the third lens respectively; surface number 8 and surface number 9 are the object side surface and image side surface of the fourth lens respectively; surface number 10 and surface number 11 are the object side surface and image side surface of the fifth lens respectively; surface number 12 and surface number 13 are the object side surface and image side surface of the filter respectively; surface number 14 and surface number 15 are the object side surface and image side surface of the protective glass; surface number 16 is the surface of the imaging surface.

[0080] According to Table 3, the conditional formula of Embodiment 3 of the present invention can be read as follows:

[0081] (1) The refractive index of the first lens Nd1 = 1.9108; the Abbe coefficient of the first lens Vd1 = 35.282;

[0082] (2) The refractive index of the second lens Nd2 = 2.0007; The Abbe coefficient of the second lens Vd2 = 25.426;

[0083] (3) The refractive index of the fourth lens Nd4=1.5928; The Abbe coefficient of the fourth lens Vd4=68.342;

[0084] (4) The refractive index of the fifth lens Nd5=2.0007; The Abbe coefficient of the fifth lens Vd5=25.426.

[0085] Table 4 - Lens parameters

[0086]

[0087]

[0088] In Example 1, due to the low yield of concentric lenses in the cold working and grinding stage, and the difficulty in ensuring the eccentricity accuracy, the performance of the lens is affected by many factors in the field of optical design. For quasi-concentric lenses, the yield of their optical properties is low in the cold working and grinding stage, and the eccentricity accuracy is difficult to ensure, which is mainly affected by the geometric shape and manufacturing tolerance of the lens. In order to overcome these limitations, the application sets the third lens to satisfy the following relationship: |L3R1-L3R2|>3.

[0089] The following is an explanation of each of the drawings in Examples 1 to 3:

[0090] Figure 1 The optical system structure diagram of the lens in Example 1. It can be seen from the figure that: the first lens has negative focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has positive focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is convex; the third lens has negative focal power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the fourth lens has positive focal power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the fifth lens has positive focal power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is convex.

[0091] Figure 2 This is the MTF diagram of the lens in Example 1 at 850nm in the near infrared band. It can be seen from the figure that the field of view angle FOV = 130°, the target surface size I MH = 4.62mm, the MTF value is greater than 0.3 at a frequency of 200l p / mm, and the MTF value is greater than 0.45 at a frequency of 125l p / mm. Since the MTF values ​​are high at both medium and high frequencies, this indeed shows that this example has high resolution and good imaging quality.

[0092] Figure 3 This is the distortion diagram of the lens in Example 1 at 850nm in the near infrared band. It can be seen from the figure that the edge field distortion values ​​are all less than ±55%, the optical distortion in the short focal length wide angle lens is small, the imaging effect is good, and the imaging restoration degree is high.

[0093] Figure 4 It is the relative illumination of the lens in the near infrared band of 850nm in Example 1. As can be seen from the figure, the relative illumination of the lens is greater than 70% at a half field of view angle HFOV=65°, indicating that the lens can still maintain a high illumination at a large field of view angle, and the illumination of the lens in the edge area decreases less, which can better maintain the overall brightness and color uniformity of the image.

[0094] Figure 5 The optical system structure diagram of the lens in Example 2. It can be seen from the figure that: the first lens has negative focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has positive focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is convex; the third lens has negative focal power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the fourth lens has positive focal power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the fifth lens has positive focal power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave.

[0095] Figure 6 This is the MTF diagram of the lens in Example 2 at 850nm in the near infrared band. It can be seen from the figure that the field of view angle FOV = 125°, the target surface size I MH = 4.62mm, the MTF value is greater than 0.15 at a frequency of 200l p / mm, and the MTF value is greater than 0.3 at a frequency of 125l p / mm. Since the MTF values ​​are high at both medium and high frequencies, this indeed shows that this example has high resolution and good imaging quality.

[0096] Figure 7 This is the distortion diagram of the lens in Example 2 at 850nm in the near-infrared band. It can be seen from the figure that the edge field distortion values ​​are all less than ±50%, the optical distortion in the short focal length wide-angle lens is small, the imaging effect is good, and the imaging restoration degree is high. It is worth mentioning that the distortion control of Example 2 is better than that of Example 1.

[0097] Figure 8 It is the relative illumination of the lens at 850nm in the near infrared band in Example 2. As can be seen from the figure, the relative illumination of the lens is greater than 70% at a half field of view angle HFOV=62.5°, indicating that the lens can still maintain a high illumination at a large field of view angle, and the illumination of the lens in the edge area decreases less, which can better maintain the overall brightness and color uniformity of the image.

[0098] Fig. 9The optical system structure diagram of the lens in Example 3. It can be seen from the figure that: the first lens has negative focal power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has positive focal power, the object side surface of the second lens is convex, and the image side surface of the second lens is concave; the third lens has positive focal power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; the fourth lens has positive focal power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the fifth lens has positive focal power, the object side surface of the fifth lens is convex, and the image side surface of the fifth lens is concave.

[0099] Fig.10 This is the MTF diagram of the lens in Example 3 at 850nm in the near-infrared band. It can be seen from the figure that the field of view angle FOV = 129°, the target surface size I MH = 4.62mm, the MTF value is greater than 0.2 at a frequency of 200l p / mm, and the MTF value is greater than 0.3 at a frequency of 125l p / mm. Since the MTF values ​​are high at both medium and high frequencies, this indeed shows that this example has a high resolution and good imaging quality.

[0100] Fig.11 This is the distortion diagram of the lens in Example 3 at 850nm in the near-infrared band. It can be seen from the figure that the edge field distortion values ​​are all less than ±55%, the optical distortion in the short focal length wide-angle lens is small, the imaging effect is good, and the imaging restoration degree is high. It is worth mentioning that the distortion control of Example 2 is better than that of Example 1.

[0101] Fig.12 It is the relative illumination of the lens at 850nm in the near infrared band in Example 3. As can be seen from the figure, the relative illumination of the lens is greater than 70% at a half field of view angle HFOV=65°, indicating that the lens can still maintain a high illumination at a large field of view angle, and the illumination of the lens in the edge area decreases less, which can better maintain the overall brightness and color uniformity of the image.

[0102] On the other hand, now refer to Fig.13 , a schematic structural diagram of an electronic device A according to the present invention will be given. Fig.10 1 is a schematic diagram of an electronic device (camera) using any one of the vehicle-mounted imaging lenses according to Embodiments 1 to 3 for an imaging optical system.

[0103] exist Fig.13, reference numeral A2 denotes an electronic device body, and reference numeral A1 denotes an imaging optical system (interchangeable lens) including any one of the on-vehicle imaging lenses according to Examples 1 to 3. Reference numeral A3 denotes an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built into the camera body A2 and receives light (optical image formed by the imaging optical system A1) from the imaging optical system A1 and performs photoelectric conversion.

[0104] By using the vehicle-mounted imaging lens according to any one of Embodiments 1 to 3 for electronic equipment such as a digital still camera or the like, it is possible to obtain an electronic equipment having high optical performance.

[0105] Various examples may provide electronic devices having high optical performance.

[0106] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A vehicle-mounted imaging lens, characterized in that: The method comprises 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 side to the image side, wherein: The first lens has negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; The second lens has positive power, the object side surface of the second lens is convex, and the image side surface of the second lens is convex or concave; The object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface or a convex surface; The fourth lens has positive power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; The fifth lens has positive power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface or a concave surface.

2. The vehicle-mounted imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: Nd1>1.9;Vd1<40; Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe coefficient of the first lens.

3. The vehicle-mounted imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: Nd2>1.9;Vd2<40; Wherein, Nd2 is the refractive index of the second lens, and Vd2 is the Abbe coefficient of the second lens.

4. The vehicle-mounted imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: the impact strength of the first lens is greater than 2.5KJ / m^2, and the Knoop hardness is greater than 650HK.

5. The vehicle-mounted imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: 1.55<Nd4<1.65;Vd4<69;In the temperature range of -40℃~105℃, dn / dT<-6*10E-6;Wherein, Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe coefficient of the fourth lens, and dn / dT is the refractive index temperature coefficient of the fourth lens.

6. The vehicle-mounted imaging lens according to claim 1, characterized in that: The lens satisfies the following relationship: Nd5>1.9;Vd5<30; Wherein, Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe coefficient of the fifth lens.

7. The vehicle-mounted imaging lens according to claim 1, characterized in that: The first lens, the second lens and the third lens form a first combined lens, the fourth lens and the fifth lens form a second combined lens, and a stop is provided between the first combined lens and the second combined lens.

8. The vehicle-mounted imaging lens according to claim 1, characterized in that: The first lens and the second lens form a first combined lens, the third lens, the fourth lens and the fifth lens form a second combined lens, and a stop is provided between the first combined lens and the second combined lens.

9. The vehicle-mounted imaging lens according to claim 7 or 8, characterized in that: The lens satisfies the following relationship: -1.5<f1 / f2<-1; -2<f1 / f<-1; 1<f2 / f<1.5; Wherein, f1 is the focal length of the first combined lens, f2 is the focal length of the second combined lens, and f is the total focal length of the lens.

10. An electronic device, characterized in that: A vehicle-mounted imaging lens according to any one of claims 1 to 9; and An image sensor is configured to receive an image formed by the vehicle-mounted imaging lens.

Images