A vehicle-mounted blind spot monitoring camera and electronic device

Abstract

This invention discloses 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 sequentially along the optical axis from the object side to the image side. The first lens has a negative refractive index, with its object side being convex and its image side being concave. The second lens also has a negative refractive index, with both its object and image sides being concave. The third lens has a positive refractive index, with both its object and image sides being convex. The lens of this invention employs a six-lens structure design. By optimizing the lens position, shape, and refractive power, and by rationally controlling the positive and negative refractive indices of each lens, lower-order aberrations of the lens can be effectively balanced. Simultaneously, the tolerance sensitivity of the lens can be reduced, maintaining the miniaturization of the lens while ensuring image quality.

Description

Technical Field

[0001] This invention relates to the field of vehicle blind spot monitoring camera technology, and in particular to a vehicle blind spot monitoring camera and electronic device. Background Technology

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

[0003] Firstly, the field of view of most current vehicle-mounted cameras is relatively small, which cannot meet the wide-angle monitoring needs of vehicle-mounted cameras on the market.

[0004] Secondly, wide-field-of-view vehicle lenses, such as F-Tan (Theta), generally suffer from excessive distortion, which severely affects the observation of drivers or other personnel.

[0005] Thirdly, general automotive lenses have low light transmission and low image quality in low-light environments, which cannot meet the resolution requirements of automotive lenses.

[0006] Fourth, automotive lenses generally use more expensive optical materials, resulting in higher production costs.

[0007] Fifth, the optical composition of general automotive lenses is complex, the processing technology is complex, the lens production cost is high, and the yield rate is low.

[0008] Sixth, the reliability requirements of general automotive lenses cannot meet the requirements such as dustproof rating IP6KX, waterproof rating IPX7, and stone impact resistance IP9K.

[0009] Seventh, general lenses use a large number of lenses, have a low optical assembly yield, and are long.

[0010] Eighth, general lenses are prone to focus loss at high and low temperatures, and cannot meet the requirements of maintaining clear imaging in the actual high and low temperature change environment of automotive lenses.

[0011] Ninth, when dealing with stray light and ghosting issues, the ratio of stray light illuminance to light source illuminance in a typical lens is greater than 10. -5 This typically fails to meet the stringent requirements of automotive lenses. Especially during use, automotive lenses may be exposed to direct sunlight or strong reflected light from highly reflective surfaces. This excessive sunlight can degrade image quality, producing noticeable stray light and ghosting, thus affecting driving safety. Summary of the Invention

[0012] In view of this, the object of the present invention is to provide a vehicle-mounted blind spot monitoring camera and electronic device. This camera can at least solve one of the technical shortcomings mentioned in the background art.

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

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

[0015] The second lens has a negative refractive index, and the object side and image side of the second lens are concave.

[0016] The third lens has a positive refractive index, and the object side and the image side of the third lens are both convex.

[0017] The fourth lens has a negative refractive index, and the object side and image side of the fourth lens are concave.

[0018] The fifth lens has a positive refractive index, and the object side and the image side of the fifth lens are both convex.

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

[0020] The lens of this invention adopts a six-lens structure design. By optimizing the lens position, shape, and diopter, and by reasonably controlling the positive and negative matching of the diopter indices of each lens, the low-order aberrations of the lens can be effectively balanced. At the same time, the tolerance sensitivity of the lens can be reduced, and the image quality of the lens can be guaranteed while maintaining its miniaturization.

[0021] According to another aspect of the present invention, an electronic device is provided, comprising a vehicle blind spot monitoring lens as described above; and an image sensor configured to receive an image formed by the vehicle blind spot monitoring lens. In this technical solution, the advantages of the electronic device depend on the vehicle blind spot monitoring lens, which will not be elaborated upon here. Attached Figure Description

[0022] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

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

[0024] Figure 2 The image shows the MTF (Mean Transformer Format) of the lens in Example 1 in the visible light band.

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

[0026] Figure 4 The relative illumination of the lens in Example 1 in 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 the visible light band in Example 2.

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

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

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

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

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

[0034] Figure 12 The relative illumination of the lens in Example 3 in the visible light band.

[0035] Figure 13 This 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 stop; CG, filter; G, protective glass; IMA, imaging plane. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the invention. Similarly, the following embodiments are only some, not all, embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

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

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

[0040] The second lens has a negative refractive index, and the object side and image side of the second lens are concave.

[0041] The third lens has a positive refractive index, and the object side and the image side of the third lens are both convex.

[0042] The fourth lens has a negative refractive index, and the object side and image side of the fourth lens are concave.

[0043] The fifth lens has a positive refractive index, and the object side and the image side of the fifth lens are both convex.

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

[0045] The lens of this invention adopts a six-lens structure design. By optimizing the lens position, shape, and diopter, and by reasonably controlling the positive and negative matching of the diopter indices of each lens, the low-order aberrations of the lens can be effectively balanced. At the same time, the tolerance sensitivity of the lens can be reduced, and the image quality of the lens can be guaranteed while maintaining its miniaturization.

[0046] Among them, reference Figure 1 , Figure 5 , Figure 9 As shown in the figure. The first lens is labeled L1, the second lens is labeled L2, the third lens is labeled L3, the fourth lens is labeled L4, the fifth lens is labeled L5, the sixth lens is labeled L6, the aperture is labeled ST, the filter is labeled G, the protective glass is labeled G, and the imaging plane is labeled IMA.

[0047] As one embodiment, the lens satisfies the following relationship: Nd1 > 1.63; Vd1 < 56; where 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, a large optical aperture ratio can be guaranteed, which is beneficial for compressing the front aperture of the lens optical system, thereby achieving lens miniaturization.

[0048] Since the first lens, as the first glass lens of the lens, is installed outside the vehicle cabin and is exposed to the air, the design phase must also consider improving the automotive-grade reliability and dependability of the lens to meet automotive-grade drop ball and gravel drop tests. Therefore, the design phase must also consider glass materials with excellent mechanical properties and chemical stability, and H-LAK11, H-LAF50B or H-ZK11 are preferred.

[0049] As one embodiment, the lens satisfies the following relationships: 1.45 < Nd² < 1.6; 60 < Vd² < 85; where Nd² is the refractive index of the second lens and Vd² is the Abbe coefficient of the second lens. The beneficial effects of this embodiment are: the second lens has a negative refractive index, thus having the effect of diverging light. By satisfying the above relationships, the second lens can reduce the incident angle of peripheral field rays on subsequent optical elements, achieving a large field of view imaging range. This makes the optical system structure compact and smaller in size, greatly reducing the space occupied by the entire optical system.

[0050] As one embodiment, the lens satisfies the following relationships: 1.95 < Nd3 < 2.05; 25 < Vd3 < 30; where 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 relationships, it helps to allocate the positive diopter of the third lens, reduce the sensitivity of the wide-angle optical lens, and improve the lens optical assembly yield.

[0051] As one embodiment, the lens satisfies the following relationships: 1.90 < Nd4 < 2.00; 15 < Vd4 < 20; where 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 relationships, it is beneficial to correct second-order chromatic aberration and improve image quality.

[0052] As one embodiment, the lens satisfies the following relationships: 1.55 < Nd5 < 1.65; 65 < Vd5 < 70; dn / dT < -6*10E-6 within the temperature range of -40℃ to 105℃; where Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe coefficient of the fifth lens, and dn / dT is the temperature coefficient of refractive index of the fifth lens. The beneficial effects of this embodiment are: the fifth lens uses a material with a special temperature coefficient of refractive index, and satisfies the above relationships, which can effectively reduce the image plane shift caused by thermal expansion and contraction, so that the lens does not require additional focusing at different temperatures, increasing the consistency of image clarity at different temperatures, balancing temperature drift, and achieving the goal of a heat-free lens.

[0053] As one embodiment, the lens satisfies the following relationship: Vd5 - Vd4 > 49; wherein, the fourth lens and the fifth lens constitute 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 use of high and low Abbe coefficient materials in the fourth and fifth lenses is beneficial for correcting second-order chromatic aberration, reducing chromatic aberration and astigmatism in the image, and improving the image quality of the lens.

[0054] As one embodiment, the lens satisfies the following relationships: 1.80 < Nd6 < 1.85; 40 < Vd6 < 50; where Nd6 is the refractive index of the sixth lens and Vd6 is the Abbe coefficient of the sixth lens. The beneficial effects of this embodiment are: by satisfying the above relationships, the optical performance of the lens is optimized, the imaging resolution is improved, and the outer diameter of the lens's rear end is effectively reduced. Through this design, the lens meets the specifications of the M12 threaded interface, thereby enhancing its versatility in various imaging systems. The application of high-refractive-index materials allows the lens to maintain high optical performance while achieving a more compact size design, which is significant for improving system integration and portability. Furthermore, the compatibility of the M12 threaded interface allows the lens to easily adapt to various standard cameras and imaging devices, thus broadening its applicability in different optical systems.

[0055] As one embodiment, the lens satisfies the following relationship: 0.2 < BFL / TTL < 0.4; where BFL is the rear optical focal length 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 advantageous to balance improving the relative illumination of the lens optical system with miniaturization.

[0056] As one embodiment, the lens satisfies the following relationship: 0.35 < H / TTL < 0.4; where H is the lens image height 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 advantageous for the optical lens to achieve both miniaturization and improved image quality.

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

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

[0059] Secondly, the lens of this invention has an aperture of FNO of 2.0. Theoretically, the larger the FNO value (the reciprocal of the aperture), the stronger its light transmission capability, adapting to changes in ambient light and darkness. Even in low-light environments, it can still maintain efficient light transmission, ensuring that the sensor can detect enough light to achieve low-light shooting capabilities. At the same time, the lens is required to have high image clarity to effectively distinguish monitoring details.

[0060] Thirdly, the lens of this invention consists of 6 global surface glass lenses, which has a simple structure and is suitable for modern automated optical assembly conditions. At the same time, it takes into account the tolerance limits of the entire optical system and has a high mass production yield.

[0061] Fourth, in the optical design stage, the lens of this invention can meet the extremely high reliability requirements of automotive optical lenses through reasonable diopter distribution and lens shape selection.

[0062] Fifth, the first lens of this invention uses optical lens materials with excellent mechanical properties and chemical stability. Combined with reasonable center and edge thicknesses, it can meet the requirements of optical lenses for resistance to stone impacts, as well as dustproof and waterproof requirements.

[0063] Sixth, this invention achieves a heat-free optical lens design by rationally allocating the refractive index, temperature coefficient, and positive and negative focal length of the lens to meet the temperature drift requirement from -40℃ to 85℃.

[0064] Seventh, the lens of this invention performs excellently in ghost image control, with low ghost image energy (stray light intensity / source light intensity < 10^-6), and occupies a small pixel and target area.

[0065] The present invention will now be described in more detail with reference to the following tables. It should be noted that the following tables are merely specific embodiments of the present invention and not limiting examples.

[0066] For ease of description, in Tables 1 to 3: surface number 1 and surface number 2 are the object-side and image-side surfaces of the first lens, respectively; surface number 3 and surface number 4 are the object-side and image-side surfaces of the second lens, respectively; surface number 5 and surface number 6 are the object-side and image-side surfaces of the third lens, respectively; surface number 7 is the surface of the aperture stop; surface number 8 and surface number 9 are the object-side and image-side surfaces of the fourth lens, respectively; surface number 9 and surface number 10 are the object-side and image-side surfaces of the fifth lens, respectively; surface number 11 and surface number 12 are the object-side and image-side surfaces of the sixth lens, respectively; surface number 13 and surface number 14 are the object-side and image-side surfaces of the filter, respectively; surface number 15 and surface number 16 are the object-side and image-side surfaces of the protective glass; and surface number 17 is the surface of the imaging plane.

[0067] Please refer to the optical structure of Example 1. Figure 1The specific parameters of this embodiment 1 are shown in Table 1 below. In this embodiment 1, the lens focal length f = 3.1 mm, the light transmission 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 Parameter Table for Example 1

[0069] Face 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 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 Sixth lens 13.4493 2.043 1.816 45.556 8.50 12 -13.4493 0.500 13 Filter 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 expression of Embodiment 1 of the present invention can be read as follows:

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

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

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

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

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

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

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

[0078] Please refer to the optical structure of Example 2. Figure 5 The specific parameters of this embodiment 2 are shown in Table 2 below. In this embodiment 2, the lens focal length f = 3.1 mm, the light transmission 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 Parameter Table for Example 2

[0080] Face 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 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 Sixth lens 13.4606 1.930 1.8348 42.725 8.30 12 -13.4606 0.500 13 Filter 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 expression of Embodiment 2 of the present invention can be read as follows:

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

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

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

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

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

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

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

[0089] Please refer to the optical structure of Example 3. Figure 9 The specific parameters of this embodiment 3 are shown in Table 3 below. In this embodiment 3, the lens focal length f = 3.1 mm, the light transmission 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 Parameter Table for Example 3

[0091] Face 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 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 Sixth lens 12.9789 2.303 1.8348 42.725 8.07 12 -12.9789 0.500 13 Filter 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 expression of Embodiment 3 of the present invention can be read as follows:

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

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

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

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

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

[0098] (7) The refractive index of the sixth lens is Nd6 = 1.8348; the Abbe coefficient of the sixth lens is 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 the first combined lens, and the fourth lens, the fifth lens, and the sixth lens constitute the second combined lens. An aperture stop is provided between the first combined lens and the second combined lens.

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

[0104] Figure 2 The image shows the MTF (Mean Transmission Format) in the visible light band for Example 1. As can be seen from the image, with a field of view (FOV) of 144° and a target size (IMH) of 7.38 mm, the MTF value is greater than 0.25 at 156 lp / mm and greater than 0.5 at 78 lp / mm. The high MTF values ​​at both mid- and high-frequency frequencies demonstrate that this example exhibits high resolution and good imaging quality.

[0105] Figure 3 This is a distortion diagram in the visible light band for Example 1. As can be seen from the diagram, the F-Theta distortion values ​​at the edge field of view are all less than ±10%, indicating relatively small optical distortion in a short focal length wide-angle lens, resulting in excellent imaging performance and high image fidelity.

[0106] Figure 4 The figure shows the relative illuminance in the visible light band in Example 1. As can be seen from the figure, the relative illuminance is greater than 60% when the half field of view (DFOV) is 144°, indicating that the lens can still maintain high illuminance at a large field of view. The illuminance of the lens decreases less in the edge areas, and it can better maintain the overall brightness and color uniformity of the image.

[0107] Figure 6 The image shows the MTF (Mean Transmission Format) in the visible light band for Example 2. As can be seen from the image, with a field of view (FOV) of 144.23° and a target size (IMH) of 7.38 mm, the MTF value is greater than 0.2 at 156 lp / mm and greater than 0.5 at 78 lp / mm. The high MTF values ​​at both mid- and high-frequency frequencies demonstrate that this example exhibits high resolution and good imaging quality.

[0108] Figure 7This is a distortion diagram in the visible light band for Example 2. As can be seen from the diagram, the F-Theta distortion values ​​at the edge field of view are all less than ±10%, indicating relatively small optical distortion in a short focal length wide-angle lens, resulting in excellent imaging performance and high image fidelity.

[0109] Figure 8 The figure shows the relative illuminance in the visible light band in Example 2. As can be seen from the figure, the relative illuminance of the lens is greater than 60% at a half field of view (DFOV) of 144.23°, indicating that the lens can maintain high illuminance even at a large field of view. The illuminance of the lens decreases less in the edge areas, and it can better maintain the overall brightness and color uniformity of the image.

[0110] Figure 10 The image shows the MTF (Mean Transmission Format) in the visible light band for Example 3. As can be seen from the image, with a field of view (FOV) of 143.88° and a target size (IMH) of 7.38 mm, the MTF value is greater than 0.2 at 156 lp / mm and greater than 0.5 at 78 lp / mm. The high MTF values ​​at both mid- and high-frequency frequencies demonstrate that this example exhibits high resolution and good imaging quality.

[0111] Figure 11 This is the distortion diagram in the visible light band for Example 3. As can be seen from the figure, the F-Theta distortion values ​​at the edge field of view are all less than ±10%, indicating relatively small optical distortion in a short focal length wide-angle lens, resulting in excellent imaging performance and high image fidelity.

[0112] Figure 12 The figure shows the relative illuminance in the visible light band in Example 3. As can be seen from the figure, the relative illuminance of the lens is greater than 60% at a half field of view (DFOV) of 143.88°, indicating that the lens can still maintain high illuminance at a large field of view. The illuminance of the lens decreases less in the edge areas, and it can better maintain the overall brightness and color uniformity of the image.

[0113] On the other hand, now refer to Figure 13 A schematic diagram of the structure of the electronic device A according to the present invention will be given. Figure 10 This is a schematic diagram of an electronic device (camera) for a camera optical system in any of the vehicle blind spot monitoring lenses according to Embodiments 1 to 3.

[0114] exist Figure 13In the figures, reference numeral A2 indicates the main body of the electronic device, and reference numeral A1 indicates any of the camera optical systems (interchangeable lenses) included in the vehicle blind spot monitoring lenses according to Examples 1 to 3. Reference numeral A3 indicates 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 (the optical image formed by the camera optical system A1) from the camera optical system A1 and performs photoelectric conversion.

[0115] By using the vehicle blind spot monitoring lens according to any one of Embodiments 1 to 3 in electronic devices such as digital still cameras, electronic devices with high optical performance can be obtained.

[0116] Each example can provide electronic devices with high optical performance.

[0117] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims will be given the broadest interpretation to cover all such modifications and equivalent structures and functions.

Claims

1. A vehicle-mounted blind spot monitoring camera, characterized in that, It consists of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side; The first lens has a negative refractive index, and the object side of the first lens is convex and the image side is concave. The second lens has a negative refractive index, and the object side and image side of the second lens are concave. The third lens has a positive refractive index, and the object side and the image side of the third lens are both convex. The fourth lens has a negative refractive index, and the object side and image side of the fourth lens are concave. The fifth lens has a positive refractive index, and the object side and the image side of the fifth lens are both convex. The sixth lens has a positive refractive index, and the object side and the image side of the sixth lens are both convex. The lens satisfies the following relationship: Nd3=2.0007; Vd3=25.426; Wherein, Nd3 is the refractive index of the third lens, and Vd3 is the Abbe coefficient of the third lens; The lens satisfies the following relationship: Nd5=1.5928; Vd5=68.342; dn / dT<-6*10E-6 in the temperature range of -40℃ to 105℃; Wherein, Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe coefficient of the fifth lens, and dn / dT is the temperature coefficient of the refractive index of the fifth lens.

2. The vehicle-mounted blind spot monitoring camera as described in claim 1, characterized in that, The lens satisfies the following relationship: 1.6385≤Nd1≤1.7725; 49.599≤Vd1≤55.447; Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe coefficient of the first lens.

3. A vehicle-mounted blind spot monitoring camera as described in 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. A vehicle-mounted blind spot monitoring camera as described in 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.

5. A vehicle-mounted blind spot monitoring camera as described in claim 1, characterized in that, The lens satisfies the following relationship: 49.446≤Vd5-Vd4≤50.4; The fourth lens and the fifth lens together form the first cemented lens, Vd4 is the Abbe coefficient of the fourth lens, and Vd5 is the Abbe coefficient of the fifth lens.

6. A vehicle-mounted blind spot monitoring camera as described in 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.

7. A vehicle-mounted blind spot monitoring camera as described in claim 1, characterized in that, The lens satisfies the following relationship: 0.266≤BFL / TTL≤0.29; Where BFL is the optical rear focal length of the lens, and TTL is the optical total length of the lens.

8. An electronic device, characterized in that, A vehicle-mounted blind spot monitoring camera according to any one of claims 1-7; and An image sensor is configured to receive images formed by the vehicle-mounted blind spot monitoring camera.

Images