Vehicle-mounted blind area monitoring lens and electronic equipment

Abstract

The invention discloses a vehicle-mounted blind area monitoring lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged in the direction from the object side to the image side along the optical axis. The first lens has a negative refractive index, 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 negative refractive index, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface; the third lens has a positive refractive index, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; and the like. The lens adopts the structural design of six lenses, the low-order aberration of the lens can be effectively balanced by optimizing the positions, the shapes, the diopters and the like of the lenses and reasonably controlling the positive and negative matching of the refractive indexes of all the lenses of the lens, meanwhile, the tolerance sensitivity of the lens can be reduced, and the stability of the lens is improved. 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 blind spot monitoring lenses, and in particular to a vehicle-mounted blind spot monitoring lens and electronic equipment. Background Art

[0002] Vehicle-mounted blind spot monitoring lenses are mainly used for low-light night vision, drone low-light lenses or handheld low-light lenses, etc. However, most existing vehicle-mounted blind spot monitoring lenses have one or more of the following defects:

[0003] First, the current field of view of general vehicle-mounted lenses is small and cannot meet the wide-viewing angle monitoring requirements of vehicle-mounted lenses on the market;

[0004] Second, the F-Tan (Theta) distortion of a wide-field-of-view vehicle lens is too large, causing serious distortion and deformation, which affects the observation of the driver or other personnel.

[0005] Third, 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;

[0006] Fourth, general vehicle-mounted lenses use relatively expensive optical materials, and the lens production cost is high;

[0007] Fifth, the general automotive lens has complex optical composition and processing technology, high lens production cost and low yield;

[0008] Sixth, the reliability requirements of general automotive lenses cannot meet the requirements of dustproof level IP6KX, waterproof level IPX7, and stone impact resistance level IP9K;

[0009] Seventh, the general lens uses a large number of lenses, the optical assembly yield is low, and the lens length is long;

[0010] Eighth, general lenses tend to lose focus easily under high and low temperature conditions, and cannot meet the requirement of maintaining clear imaging under the high and low temperature changes in actual use of automotive lenses;

[0011] Ninth, 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

[0012] In view of this, the purpose of the present invention is to provide a vehicle-mounted blind spot monitoring lens and electronic equipment. The lens can solve at least one technical disadvantage mentioned in the background technology.

[0013] According to one aspect of the present invention, there is provided a vehicle-mounted blind spot monitoring lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along an optical axis from an object side to an image side;

[0014] The first lens has a negative refractive power, the object side surface of the first lens is convex, and the image side surface is concave;

[0015] The second lens has a negative refractive power, and the object side surface and the image side surface of the second lens are concave;

[0016] The third lens has a positive refractive power, and the object side surface and the image side surface of the third lens are convex;

[0017] The fourth lens has a negative refractive power, and the object side surface and the image side surface of the fourth lens are concave;

[0018] The fifth lens has a positive refractive power, and the object side surface and the image side surface of the fifth lens are convex;

[0019] The sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex.

[0020] The lens of the present invention adopts a six-lens structural design. By optimizing the lens position, shape and refractive power, and by reasonably controlling the positive and negative matching of the refractive power of each lens of the 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.

[0021] According to another aspect of the present invention, an electronic device is provided, according to the above-mentioned vehicle-mounted blind spot monitoring lens; and an image sensor, which is configured to receive an image formed by the vehicle-mounted blind spot monitoring lens. In this technical solution, the advantages of the electronic device depend on the vehicle-mounted blind spot monitoring lens, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 This is a structural diagram of the optical system of the lens in Example 1.

[0024] Figure 2 This is the MTF diagram of the lens in Example 1 in the visible light band.

[0025] Figure 3 This is a distortion diagram of the lens in Example 1 in the visible light band.

[0026] Figure 4 is the relative illumination of the lens in Example 1 under the visible light band.

[0027] Figure 5 This is a structural diagram of the optical system of the lens in Example 2.

[0028] Figure 6 This is the MTF diagram of the lens in Example 2 in the visible light band.

[0029] Figure 7 This is a distortion diagram of the lens in Example 2 in the visible light band.

[0030] Figure 8 is the relative illumination of the lens in Example 2 under the visible light band.

[0031] Fig. 9 This is a structural diagram of the optical system of the lens in Example 3.

[0032] Fig.10 This is the MTF diagram of the lens in Example 3 in the visible light band.

[0033] Fig.11 This is a distortion diagram of the lens in Example 3 in the visible light band.

[0034] Fig.12 is the relative illumination of the lens in Example 3 under the visible light band.

[0035] Fig.13 It is a schematic diagram of the structure of the electronic device of the present invention.

[0036] L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; ST, aperture; CG, filter; G, protective glass; I MA, imaging surface. DETAILED DESCRIPTION

[0037] 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.

[0038] The object of the present invention is to provide a vehicle-mounted blind spot monitoring lens, comprising a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along an optical axis from an object side to an image side;

[0039] The first lens has a negative refractive power, the object side surface of the first lens is convex, and the image side surface is concave;

[0040] The second lens has a negative refractive power, and the object side surface and the image side surface of the second lens are concave;

[0041] The third lens has a positive refractive power, and the object side surface and the image side surface of the third lens are convex;

[0042] The fourth lens has a negative refractive power, and the object side surface and the image side surface of the fourth lens are concave;

[0043] The fifth lens has a positive refractive power, and the object side surface and the image side surface of the fifth lens are convex;

[0044] The sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex.

[0045] The lens of the present invention adopts a six-lens structural design. By optimizing the lens position, shape and refractive power, and by reasonably controlling the positive and negative matching of the refractive power of each lens of the 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.

[0046] 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 sixth lens is denoted by L6, 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 IMA.

[0047] As an embodiment, the lens satisfies the following relationship: Nd1>1.63; Vd1<56; 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 guaranteed, which is conducive to compressing the front aperture of the lens optical system to achieve miniaturization of the lens.

[0048] Since the first lens is the first glass lens of the lens, it is installed outside the cabin and exposed to the air. Therefore, in the design stage, we must also consider improving the automotive-grade trustworthiness and reliability of the lens to meet automotive-grade reliability tests such as falling balls and falling gravel. Therefore, in the design stage, we must also consider the mechanical properties and chemical stability of the first glass material. The most preferred choice is H-LAK11, H-LAF50B or H-ZK11.

[0049] As an embodiment, the lens satisfies the following relationship: 1.45<Nd2<1.6; 60<Vd2<85; 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 has a negative refractive power, and thus has the effect of diverging light. 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 greatly help to reduce the space occupied by the entire optical system.

[0050] As an embodiment, the lens satisfies the following relationship: 1.95<Nd3<2.05; 25<Vd3<30; wherein Nd3 is the refractive index of the third lens, and Vd3 is the Abbe coefficient of the third lens. The beneficial effect of this embodiment is that by satisfying the above relationship, it is helpful to distribute the positive refractive power of the third lens, reduce the sensitivity of the wide-angle optical lens, and improve the lens optical assembly yield.

[0051] As an embodiment, the lens satisfies the following relationship: 1.90<Nd4<2.00; 15<Vd4<20; wherein Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe coefficient of the fourth lens. The beneficial effect of this embodiment is that by satisfying the above relationship, it is beneficial to correct the secondary chromatic aberration and improve the imaging quality.

[0052] As an embodiment, the lens satisfies the following relationship: 1.55<Nd5<1.65; 65<Vd5<70; in the temperature range of -40℃~105℃, dn / dT<-6*10E-6; wherein Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe coefficient of the fifth lens, and dn / dT is the refractive index temperature coefficient of the fifth lens. The beneficial effect of this embodiment is that the fifth 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.

[0053] As an embodiment, the lens satisfies the following relationship: Vd5-Vd4>49; wherein the fourth lens and the fifth lens form a first cemented lens, Vd4 is the Abbe coefficient of the fourth lens, and Vd5 is the Abbe coefficient of the fifth lens. The beneficial effect of this embodiment is that the fourth lens and the fifth lens are used in combination with high and low Abbe coefficient materials, which is conducive to correcting secondary chromatic aberration, reducing chromatic aberration and astigmatism of imaging, and improving the imaging quality of the lens.

[0054] As an embodiment, the lens satisfies the following relationship: 1.80<Nd6<1.85; 40<Vd6<50; wherein Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe coefficient of the sixth 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 M12 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 M12 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.

[0055] As an embodiment, the lens satisfies the following relationship: 0.2<BFL / TTL<0.4; wherein 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.

[0056] As an embodiment, the lens satisfies the following relationship: 0.35<H / TTL<0.4; wherein 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.

[0057] In summary, the beneficial effects of the present invention are as follows:

[0058] First, the field of view angle of the lens of the present invention can reach 144°-150°, corresponding to a target surface of 7.05 mm, and the lens F-Tan (Theta) distortion is less than -10%.

[0059] Secondly, 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 stronger its light transmission ability is, and it can adapt to the changes in light and dark in the external environment. In the low-light environment, it can still ensure efficient light transmission ability, ensure that the sensor can sense enough light, and realize the ability to shoot in low light. At the same time, the lens is required to have a high imaging clarity to effectively distinguish the monitoring details.

[0060] Thirdly, the lens of the present invention is composed of 6 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 lens mass production yield.

[0061] Fourthly, during the optical design stage, the lens of the present invention can meet the extremely high reliability requirements of the vehicle-mounted optical lens through reasonable diopter distribution and lens shape selection.

[0062] Fifth, 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.

[0063] Sixth, the present invention satisfies the temperature drift requirement of -40°C to 85°C by reasonably allocating the refractive index, temperature coefficient and positive and negative focal length of the lens, thereby realizing the athermal design of the optical lens.

[0064] Seventh, the lens of the present invention performs excellently in ghost image control, with small ghost image energy (stray light illumination / light source illumination <10^-6), and small occupied pixels and target surface area.

[0065] 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.

[0066] For the convenience of description, in Tables 1 to 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 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 9 and surface number 10 are the object side surface and image side surface of the fifth lens, respectively; surface number 11 and surface number 12 are the object side surface and image side surface of the sixth lens, respectively; surface number 13 and surface number 14 are the object side surface and image side surface of the filter, respectively; surface number 15 and surface number 16 are the object side surface and image side surface of the protective glass; surface number 17 is the surface of the imaging surface.

[0067] For the optical structure of Example 1, please refer to Figure 1Specific parameters of this embodiment 1 are shown in the following table 1. In this embodiment 1, the focal length of the lens f=3.1 mm, the light clearance FNO=2.0, the field of view FOV=144°, the target surface size I MH=7.38 mm, and the total length TTL=22 mm.

[0068] Table 1 - Lens parameters of Example 1

[0069] Surface number type Radius of curvature thickness Refractive Index Abbe coefficient Lens focal length 1 First lens 24.4815 1.000 1.6646 54.612 -6.52 2 3.6319 3.221 3 Second lens -47.4459 1.948 1.5168 64.199 -6.93 4 3.9401 0.500 5 The third lens 6.5121 2.556 2.0007 25.426 5.08 6 -19.1524 -0.044 7 Aperture Infinity 1.531 8 The fourth lens -43.0390 0.800 1.946 17.942 -5.26 9 Fifth lens 5.7413 1.970 1.5928 68.342 5.16 10 -5.7413 0.080 11 The sixth lens 13.4493 2.043 1.816 45.556 8.50 12 -13.4493 0.500 13 Optical Filters Infinity 0.300 1.5168 64.199 14 Infinity 5.144 15 Protective glass Infinity 0.400 1.5168 64.199 16 Infinity 0.045 17 Imaging surface Infinity -

[0070] According to Table 1, the conditional formula of Example 1 of the present invention can be read as follows:

[0071] (1) The refractive index of the first lens Nd1 = 1.6646; the Abbe coefficient of the first lens Vd1 = 54.612;

[0072] (2) The refractive index of the second lens Nd2 = 1.5168; The Abbe coefficient of the second lens Vd2 = 64.199;

[0073] (3) The refractive index of the third lens Nd3 = 2.0007; The Abbe coefficient of the third lens Vd3 = 25.426;

[0074] (4) The refractive index of the fourth lens Nd4=1.946; The Abbe coefficient of the fourth lens Vd4=17.942;

[0075] (5) The refractive index of the fifth lens Nd5 = 1.5928; The Abbe coefficient of the fifth lens Vd5 = 68.342;

[0076] (6) Vd5-Vd4=50.4;

[0077] (7) The refractive index of the sixth lens Nd6=1.816; The Abbe coefficient of the sixth lens Vd6=45.556.

[0078] 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=3.1 mm, the light clearance FNO=2.0, the field of view FOV=144.23°, the target surface size I MH=7.38 mm, and the total length TTL=22 mm.

[0079] Table 2 - Lens parameters of Example 2

[0080] Surface number type Radius of curvature thickness Refractive Index Abbe coefficient Lens focal length 1 First lens 27.5011 1.000 1.6385 55.447 -6.59 2 3.6073 2.527 3 Second lens -67.9916 2.629 1.5168 64.199 -7.04 4 3.9052 0.570 5 The third lens 6.7078 2.729 2.0007 25.426 5.19 6 -18.9301 -0.042 7 Aperture Infinity 1.554 8 The fourth lens -42.1660 0.800 1.946 17.942 -5.26 9 Fifth lens 5.7638 1.844 1.5928 68.342 5.16 10 -5.7638 0.100 11 The sixth lens 13.4606 1.930 1.8348 42.725 8.30 12 -13.4606 0.500 13 Optical Filters Infinity 0.300 1.5168 64.199 14 Infinity 5.111 15 Protective glass Infinity 0.400 1.5168 64.199 16 Infinity 0.045 17 Imaging surface Infinity -

[0081] According to Table 2, the conditional formula of Embodiment 2 of the present invention can be read as follows:

[0082] (1) The refractive index of the first lens Nd1 = 1.6385; the Abbe coefficient of the first lens Vd1 = 55.447;

[0083] (2) The refractive index of the second lens Nd2 = 1.5168; The Abbe coefficient of the second lens Vd2 = 64.199;

[0084] (3) The refractive index of the third lens Nd3 = 2.0007; The Abbe coefficient of the third lens Vd3 = 25.426;

[0085] (4) The refractive index of the fourth lens Nd4=1.946; The Abbe coefficient of the fourth lens Vd4=17.942;

[0086] (5) The refractive index of the fifth lens Nd5 = 1.5928; The Abbe coefficient of the fifth lens Vd5 = 68.342;

[0087] (6) Vd5-Vd4=50.4;

[0088] (7) The refractive index of the sixth lens Nd6=1.8348; The Abbe coefficient of the sixth lens Vd6=42.725.

[0089] 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=3.1 mm, the light clearance FNO=2.0, the field of view FOV=143.88°, the target surface size I MH=7.38 mm, and the total length TTL=22 mm.

[0090] Table 3 - Lens parameters of Example 3

[0091] Surface number type Radius of curvature thickness Refractive Index Abbe coefficient Lens focal length 1 First lens 20.2965 1.591 1.7725 49.599 -7.83 2 4.5122 2.295 3 Second lens -23.2687 1.355 1.497 81.613 -5.64 4 3.2540 0.740 5 The third lens 6.9879 3.189 2.0007 25.426 5.23 6 -16.4947 0.004 7 Aperture Infinity 1.207 8 The fourth lens -45.8992 1.181 1.9229 18.896 -4.95 9 Fifth lens 5.1941 2.103 1.5928 68.342 4.73 10 -5.1941 0.281 11 The sixth lens 12.9789 2.303 1.8348 42.725 8.07 12 -12.9789 0.500 13 Optical Filters Infinity 0.300 1.5168 64.199 14 Infinity 4.641 15 Protective glass Infinity 0.400 1.5168 64.199 16 Infinity 0.045 17 Imaging surface Infinity -

[0092] According to Table 3, the conditional formula of Embodiment 3 of the present invention can be read as follows:

[0093] (1) The refractive index of the first lens Nd1 = 1.7725; the Abbe coefficient of the first lens Vd1 = 49.599;

[0094] (2) The refractive index of the second lens Nd2 = 1.497; The Abbe coefficient of the second lens Vd2 = 81.613;

[0095] (3) The refractive index of the third lens Nd3 = 2.0007; The Abbe coefficient of the third lens Vd3 = 25.426;

[0096] (4) The refractive index of the fourth lens Nd4=1.9229; The Abbe coefficient of the fourth lens Vd4=18.896;

[0097] (5) The refractive index of the fifth lens Nd5 = 1.5928; The Abbe coefficient of the fifth lens Vd5 = 68.342; (6) Vd5 - Vd4 = 49.446;

[0098] (7) The refractive index of the sixth lens Nd6=1.8348; The Abbe coefficient of the sixth lens Vd6=42.725.

[0099] Table 4 - Lens parameters

[0100]

[0101]

[0102] In Table 4, the first lens, the second lens and the third lens constitute a first combined lens, the fourth lens, the fifth lens and the sixth lens constitute a second combined lens, and an aperture stop is provided between the first combined lens and the second combined lens.

[0103] The following is an explanation of each of the drawings in Examples 1 to 3:

[0104] Figure 2 This is the MTF diagram in the visible light band in Example 1. It can be seen from the figure that at the field of view angle FOV = 144°, the target surface size I MH = 7.38 mm, the MTF value is greater than 0.25 at the frequency of 156l p / mm, and the MTF value is greater than 0.5 at the frequency of 78l p / mm. Since the MTF values ​​are relatively high at both the medium and high frequencies, this indeed shows that this example has a relatively high resolution and good imaging quality.

[0105] Figure 3 This is a distortion diagram in the visible light band in Example 1. It can be seen from the figure that the F-Theta distortion values ​​of the edge field of view are all less than ±10%, 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.

[0106] Figure 4 It is the relative illumination in the visible light band in Example 1. As can be seen from the figure, when the half field of view angle DFOV=144°, the relative illumination is greater than 60%, 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.

[0107] Figure 6 This is the MTF diagram in the visible light band in Example 2. It can be seen from the figure that at the field of view angle FOV = 144.23°, the target surface size I MH = 7.38 mm, the MTF value is greater than 0.2 at the frequency of 156l p / mm, and the MTF value is greater than 0.5 at the frequency of 78l p / mm. Since the MTF values ​​are high at both the medium frequency and the high frequency, this indeed shows that this example has a high resolution and good imaging quality.

[0108] Figure 7This is a distortion diagram in the visible light band in Example 2. It can be seen from the figure that the F-Theta distortion values ​​of the edge field of view are all less than ±10%, 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.

[0109] Figure 8 is the relative illumination in the visible light band in Example 2. As can be seen from the figure, when the half field of view angle DFOV=144.23°, the relative illumination is greater than 60%, 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.

[0110] Fig.10 This is the MTF diagram in the visible light band in Example 3. It can be seen from the figure that at the field of view angle FOV = 143.88°, the target surface size I MH = 7.38 mm, the MTF value is greater than 0.2 at the frequency of 156l p / mm, and the MTF value is greater than 0.5 at the frequency of 78l p / mm. Since the MTF values ​​are high at both the medium frequency and the high frequency, this indeed shows that this example has a high resolution and good imaging quality.

[0111] Fig.11 This is a distortion diagram in the visible light band in Example 3. It can be seen from the figure that the F-Theta distortion values ​​of the edge field of view are all less than ±10%, 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.

[0112] Fig.12 is the relative illumination in the visible light band in Example 3. As can be seen from the figure, when the half field of view angle DFOV=143.88°, the relative illumination is greater than 60%, 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.

[0113] 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 blind spot monitoring lenses according to Embodiments 1 to 3 as an imaging optical system.

[0114] 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 vehicle-mounted blind spot monitoring 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.

[0115] By using the vehicle-mounted blind spot monitoring lens according to any one of Embodiments 1 to 3 for an electronic device such as a digital still camera or the like, an electronic device having high optical performance can be obtained.

[0116] Various examples may provide electronic devices having high optical performance.

[0117] 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 blind spot monitoring camera, characterized in that: It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence along the optical axis from the object side to the image side; The first lens has a negative refractive power, the object side surface of the first lens is convex, and the image side surface is concave; The second lens has a negative refractive power, and the object side surface and the image side surface of the second lens are concave; The third lens has a positive refractive power, and the object side surface and the image side surface of the third lens are convex; The fourth lens has a negative refractive power, and the object side surface and the image side surface of the fourth lens are concave; The fifth lens has a positive refractive power, and the object side surface and the image side surface of the fifth lens are convex; The sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex.

2. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: Nd1>1.63;Vd1<56; Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe coefficient of the first lens.

3. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: 1.45<Nd2<1.6; 60<Vd2<85; Wherein, Nd2 is the refractive index of the second lens, and Vd2 is the Abbe coefficient of the second lens.

4. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: 1.95<Nd3<2.05; 25<Vd3<30; Wherein, Nd3 is the refractive index of the third lens, and Vd3 is the Abbe coefficient of the third lens.

5. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: 1.90<Nd4<2.00; 15<Vd4<20; Wherein, Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe coefficient of the fourth lens.

6. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: 1.55<Nd5<1.65; 65<Vd5<70; in the temperature range of -40℃~105℃, dn / dT<-6*10E-6; wherein Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe coefficient of the fifth lens, and dn / dT is the refractive index temperature coefficient of the fifth lens.

7. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: Vd5-Vd4>49 ； The fourth lens and the fifth lens form a first cemented lens, Vd4 is the Abbe coefficient of the fourth lens, and Vd5 is the Abbe coefficient of the fifth lens.

8. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: 1.80<Nd6<1.85; 40<Vd6<50; Wherein, Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe coefficient of the sixth lens.

9. The vehicle-mounted blind spot monitoring camera according to claim 1, characterized in that: The lens satisfies the following relationship: 0.2<BFL / TTL<0.4; Among them, BFL is the optical back focus of the lens, and TTL is the total optical length of the lens.

10. An electronic device, characterized in that: A vehicle-mounted blind spot monitoring 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 blind spot monitoring lens.

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