4k optical lens and imaging device

Abstract

The application discloses a 4K optical lens, the focal length of which is 60mm, the F number is 1.4, and the working wave band is 0.486-0.656 mu m and 0.76-0.96 mu m; the lens comprises first to tenth lenses arranged in sequence along the transmission direction of the optical axis, the first lens, the second lens, the fourth lens, the sixth lens and the eighth lens are double convex lenses, the third lens, the fifth lens and the seventh lens are double concave lenses, the ninth lens is a meniscus negative lens with the convex surface facing the object side, and the tenth lens is a meniscus positive lens with the convex surface facing the object side; a diaphragm is arranged between the third lens and the fourth lens, the second lens and the third lens are attached to each other, the fourth lens and the fifth lens are attached to each other, and the sixth lens and the seventh lens are attached to each other. Through the mutual combination of different lenses and the distribution of the total optical power, a large aperture is adopted, and a double wave band is used, so that the 4K optical lens can obtain 4K high-definition images and videos in the daytime and at night, and good optical performance is ensured. The application further discloses an imaging device.

Description

Technical Field

[0001] This application belongs to the field of optical device technology, specifically relating to a 4K optical lens and imaging device. Background Technology

[0002] In recent years, with the continuous improvement of the processing, installation, and adjustment levels of optical imaging components, and the ever-increasing resolution of image sensors, the performance requirements for optical lenses have also become increasingly demanding. Currently, conventional optical lenses struggle to acquire 4K high-definition images and videos both day and night. Furthermore, to adapt to high-resolution imaging in low-light conditions such as moonlight, starlight, and atmospheric glow at night, optical lenses require high relative illumination and must possess large relative apertures and long focal lengths. Therefore, there is an urgent need to design a lens capable of acquiring 4K high-definition images and videos both day and night. Summary of the Invention

[0003] Based on this, a 4K optical lens and imaging device capable of acquiring 4K high-definition images and videos during both day and night is provided.

[0004] The technical solution proposed in this application is as follows:

[0005] A 4K optical lens with a focal length of 60mm, an f-number of 1.4, and an operating wavelength of 0.486-0.656μm and 0.76-0.96μm;

[0006] The lens includes a first lens to a tenth lens arranged sequentially along the optical axis transmission direction. The first lens, the second lens, the fourth lens, the sixth lens and the eighth lens are biconvex lenses, the third lens, the fifth lens and the seventh lens are biconcave lenses, the ninth lens is a meniscus negative lens with its convex surface facing the object side, and the tenth lens is a meniscus positive lens with its convex surface facing the object side.

[0007] An aperture stop is provided between the third lens and the fourth lens, the second lens and the third lens are attached to each other, the fourth lens and the fifth lens are attached to each other, and the sixth lens and the seventh lens are attached to each other.

[0008] By employing the aforementioned 4K optical lens, through the combination of different lenses and the combined distribution of optical power, along with a large aperture and dual-band operation, this 4K optical lens can acquire 4K high-definition images and videos both day and night, ensuring excellent optical performance.

[0009] Furthermore, the center thickness of the first lens is 7 mm, and the air gap between the first lens and the second lens is 0.32 mm;

[0010] The center thickness of the second lens is 11.3 mm, the center thickness of the third lens is 7 mm, the air gap between the third lens and the aperture stop is 4.708 mm, and the air gap between the aperture stop and the fourth lens is 0.3 mm.

[0011] The center thickness of the fourth lens is 8.2 mm, the center thickness of the fifth lens is 2 mm, and the air gap between the fifth lens and the sixth lens is 7.849 mm.

[0012] The center thickness of the sixth lens is 8 mm, the center thickness of the seventh lens is 5.45 mm, and the air gap between the seventh lens and the eighth lens is 3.557 mm.

[0013] The center thickness of the eighth lens is 8.45 mm, and the air gap between the eighth lens and the ninth lens is 3.514 mm; the center thickness of the ninth lens is 6.5 mm, the air gap between the ninth lens and the tenth lens is 2.197 mm, and the center thickness of the tenth lens is 6.3 mm.

[0014] Further, the first lens has a refractive index of 1.61 and a dispersion coefficient of 56.7; the second lens has a refractive index of 1.44 and a dispersion coefficient of 94.5; the third lens has a refractive index of 1.74 and a dispersion coefficient of 27.8; the fourth lens has a refractive index of 1.95 and a dispersion coefficient of 17.9; the fifth lens has a refractive index of 1.73 and a dispersion coefficient of 28.3; the sixth lens has a refractive index of 1.74 and a dispersion coefficient of 44.9; the seventh lens has a refractive index of 1.81 and a dispersion coefficient of 22.7; the eighth lens has a refractive index of 1.88 and a dispersion coefficient of 40.8; the ninth lens has a refractive index of 1.85 and a dispersion coefficient of 30; and the tenth lens has a refractive index of 2 and a dispersion coefficient of 25.4.

[0015] Furthermore, the object-side surface and image-side surface of all lenses from the first lens to the tenth lens are spherical.

[0016] An imaging apparatus includes a 4K optical lens as described above and a detector for receiving images formed by the 4K optical lens.

[0017] Furthermore, the detector has 3840×2160 pixels and a pixel size of 2.9μm. Attached Figure Description

[0018] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0019] Figure 1 This is a schematic diagram of the optical path structure of an imaging device provided in an embodiment of this application;

[0020] Figure 2 MTF chart of a 4K optical lens provided in an embodiment of this application at a wavelength of 0.486-0.656μm and a temperature of 20°C;

[0021] Figure 3 MTF chart of a 4K optical lens provided in an embodiment of this application at a temperature of 60°C and in the 0.486-0.656μm band;

[0022] Figure 4 MTF chart of a 4K optical lens provided in an embodiment of this application at a wavelength of -40°C in the 0.486-0.656μm band.

[0023] Figure 5 MTF diagram of a 4K optical lens provided in an embodiment of this application at a temperature of 20°C and in the 0.76-0.96μm band;

[0024] Figure 6 MTF diagram of a 4K optical lens provided in an embodiment of this application at a temperature of 60°C and a wavelength of 0.76-0.96μm;

[0025] Figure 7 MTF diagram of a 4K optical lens provided in an embodiment of this application at a temperature of -40°C in the 0.76-0.96μm band;

[0026] Figure 8 Field curvature / distortion of a 4K optical lens provided in an embodiment of this application in the 0.486-0.656μm band;

[0027] Figure 9 Field curvature / distortion of a 4K optical lens provided in an embodiment of this application in the 0.76-0.96μm band;

[0028] Figure 10 The relative illumination of a 4K optical lens provided in an embodiment of this application in the 0.486-0.656μm band;

[0029] Figure 11 The relative illumination of a 4K optical lens provided in an embodiment of this application in the 0.76-0.96μm band.

[0030] Label Explanation:

[0031] 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 15. Fifth lens; 16. Sixth lens; 17. Seventh lens; 18. Eighth lens; 19. Ninth lens; 20. Tenth lens; 21. Aperture stop; 22. Protective window; 23. Image plane. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] This application discloses an imaging device with an operating temperature range of -40℃ to 60℃. The imaging device includes a 4K optical lens and a detector for receiving the image captured by the 4K optical lens. The 4K optical lens has a focal length of 60mm, an f / 1.4 aperture, and operates in dual wavelength bands: 0.486-0.656μm and 0.76-0.96μm. The detector is a CMOS (Complementary Metal-Oxide-Semiconductor) detector with a pixel count of 3840×2160 and a pixel size of 2.9μm.

[0034] like Figure 1 As shown, in one embodiment, the 4K optical lens includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, an eighth lens 18, a ninth lens 19, and a tenth lens 20 arranged sequentially along the optical axis transmission direction. The first lens 11, the second lens 12, the fourth lens 14, the sixth lens 16, and the eighth lens 18 are biconvex lenses, the third lens 13, the fifth lens 15, and the seventh lens 17 are biconcave lenses, the ninth lens 19 is a meniscus negative lens with its convex surface facing the object side, and the tenth lens 20 is a meniscus positive lens with its convex surface facing the object side.

[0035] An aperture stop 21 is provided between the third lens 13 and the fourth lens 14, the second lens 12 and the third lens 13 are attached to each other, the fourth lens 14 and the fifth lens 15 are attached to each other, and the sixth lens 16 and the seventh lens 17 are attached to each other.

[0036] It should be noted that in this embodiment, the lenses that are bonded together can be fixed together by a fixing structure or by adhesive bonding, and there is no limitation on this. In addition, in this embodiment, adhesive bonding is preferred to ensure better mechanical strength, improve impact and vibration resistance, simplify assembly, reduce the assembly difficulty of complex optical systems, reduce interface reflection and increase light transmittance, thereby improving optical performance.

[0037] By employing the aforementioned 4K optical lens, through the combination of different lenses and the combined distribution of optical power, along with a large aperture and dual-band operation, this 4K optical lens can acquire 4K high-definition images and videos both day and night, ensuring excellent optical performance.

[0038] In one embodiment, as shown in Table 1, the center thickness of the first lens 11 is 7 mm, and the air gap between the first lens 11 and the second lens 12 is 0.32 mm; the center thickness of the second lens 12 is 11.3 mm, the center thickness of the third lens 13 is 7 mm, the air gap between the third lens 13 and the aperture 21 is 4.708 mm, and the air gap between the aperture 21 and the fourth lens 14 is 0.3 mm; the center thickness of the fourth lens 14 is 8.2 mm, the center thickness of the fifth lens 15 is 2 mm, and the air gap between the fifth lens 15 and the sixth lens 1... The air gap between the six lenses is 7.849 mm; the center thickness of the sixth lens 16 is 8 mm, the center thickness of the seventh lens 17 is 5.45 mm, the air gap between the seventh lens 17 and the eighth lens 18 is 3.557 mm; the center thickness of the eighth lens 18 is 8.45 mm, the air gap between the eighth lens 18 and the ninth lens 19 is 3.514 mm; the center thickness of the ninth lens 19 is 6.5 mm, the air gap between the ninth lens 19 and the tenth lens 20 is 2.197 mm, and the center thickness of the tenth lens 20 is 6.3 mm.

[0039] Furthermore, the first lens 11 has a refractive index of 1.61 and a dispersion coefficient of 56.7; the second lens 12 has a refractive index of 1.44 and a dispersion coefficient of 94.5; the third lens 13 has a refractive index of 1.74 and a dispersion coefficient of 27.8; the fourth lens 14 has a refractive index of 1.95 and a dispersion coefficient of 17.9; the fifth lens 15 has a refractive index of 1.73 and a dispersion coefficient of 28.3; the sixth lens 16 has a refractive index of 1.74 and a dispersion coefficient of 44.9; the seventh lens 17 has a refractive index of 1.81 and a dispersion coefficient of 22.7; the eighth lens 18 has a refractive index of 1.88 and a dispersion coefficient of 40.8; the ninth lens 19 has a refractive index of 1.85 and a dispersion coefficient of 30; and the tenth lens 20 has a refractive index of 2 and a dispersion coefficient of 25.4.

[0040] It should be noted that each lens can be made of a material with a refractive index and dispersion coefficient corresponding to the above data, and the specific material is not limited here.

[0041] In one embodiment, the object-side surface and image-side surface of all lenses from the first lens 11 to the tenth lens 20 are spherical. It should be explained that... Figure 1 In this process, the light beam travels from left to right, with the left side being the object side and the right side being the image side. Therefore, the left surface of each lens is the object side surface and the right surface is the image side surface.

[0042] Furthermore, the radius of curvature R1 of the object-side surface of the first lens 11 is 75mm < R1 < 85mm, and the radius of curvature R2 of the image-side surface is -600mm < R2 < -500mm; the radius of curvature R3 of the object-side surface of the second lens 12 is 43mm < R3 < 48mm, the radius of curvature R4 of the image-side surface of the second lens 12 and the object-side surface of the third lens 13 is -70mm < R4 < -60mm, and the radius of curvature R5 of the image-side surface of the third lens 13 is 60mm < R5 < 65mm. mm; the radius of curvature R6 of the object side of the fourth lens 14 is: 45mm < R6 < 50mm; the radius of curvature R7 of the image side of the fourth lens 14 and the object side of the fifth lens 15 is: -55mm < R7 < -46mm; the radius of curvature R8 of the image side of the fifth lens 15 is: 34mm < R8 < 40mm; the radius of curvature R9 of the object side of the sixth lens 16 is: 74mm < R9 < 81mm; the radius of curvature R of the image side of the sixth lens 16 and the object side of the seventh lens 17 is: R... 10 = -27mm < R 10 <-21mm, the radius of curvature R of the image-side surface of the seventh lens 17 11 For: 24mm < R 11 <30mm; Radius of curvature R of the object side surface of the eighth lens 18 12 For: 30mm < R 12 <35mm, like the radius of curvature R of the side 13 For: -400mm < R 13 <-250mm; Radius of curvature R of the object side surface of the ninth lens 19 14 For: 20mm < R 14 <30mm, like the radius of curvature R of the side surface 15 For: 16mm < R 15 <20mm; Radius of curvature R of the object side surface of the tenth lens 20 16 For: 20mm < R 16 <25mm, like the radius of curvature R of the side surface 17 For: 20mm < R 17 <30mm.

[0043] For example, R1=77.3 / 82 / 84mm, R2=-572 / -550.7 / -527.1mm, R3=44 / 45.5 / 46mm, R4=-67.2 / -64 / -62.5mm, R5=61.8 / 62.5 / 64mm, R6=46 / 47.7 / 49mm, R7=-52 / -48 / -47mm, R8=35 / 37.4 / 38mm, R9=74.9 / 78.2 / 80mm, R 10 =-26 / -23.6 / -22mm, R 11 =24.6 / 26.5 / 27.9mm, R 12 =30.1 / 32.5 / 33.5mm, R 13 =-378.2 / -294.7 / -265mm, R 14 =25 / 27.9 / 29mm, R 15 =17 / 18 / 19.5mm, R 16 =21 / 21.9 / 23.6mm, R 17 =25.5 / 26.9 / 28.9mm. It should be noted that this example only shows three sets of data within the range, and does not imply that only three sets of data are possible within the specified range.

[0044] Table 1 Lens Parameters

[0045]

[0046] It is understandable that for two lenses that are in contact with each other, the image side of the lens in front and the object side of the lens behind are in contact along the optical axis transmission direction, and their radii of curvature are the same. Therefore, in Table 1, only the object side of the lens behind is shown.

[0047] Combination Figure 1 It should be noted that the detector includes a protective window 22 and an image plane 23 arranged sequentially, and the air gap between the image side of the tenth lens 20 and the protective window 22 is 3.627 mm. The protective window 22 can also be replaced with a filter.

[0048] Please see Figures 2 to 9 , Figures 2 to 4 The image shows the MTF (Mean Transformer Format) of the 4K optical lens in the above embodiment in the 0.486-0.656μm band. Figures 5 to 7 The MTF diagram of the 4K optical lens in the above embodiment in the 0.76-0.96μm band; Figure 8 The field curvature / distortion of the 4K optical lens in the above embodiments in the 0.486-0.656μm band is described. Figure 9This refers to the field curvature / distortion of the 4K optical lens in the 0.76-0.96μm wavelength range described in the above embodiments. The 4K optical lens provided in this application employs a heat-free design using domestically produced spherical glass, resulting in a simple, compact structure and small size. Furthermore, it utilizes material dispersion matching; for example, a cemented doublet lens group uses a high-dispersion material lens and a low-dispersion material glass bonded together to achieve dispersion matching. The combination of different lenses and the rational allocation of optical power ensure excellent optical performance.

[0049] Please also see Figure 10 and Figure 11 , Figure 10 The relative illumination of the 4K optical lens in the above embodiment in the 0.486-0.656μm band is given. Figure 11 This refers to the relative illumination of the 4K optical lens in the 0.76-0.96μm band in the above embodiments. This imaging device is suitable for imaging in high-brightness environments during the day and low-light environments at night, and can switch bands for imaging to ensure clear images both day and night.

[0050] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A 4K optical lens, characterized in that, The focal length is 60mm, the F-number is 1.4, and the working wavelength is 0.486-0.656μm and 0.76-0.96μm. The lens is composed of a first lens to a tenth lens arranged sequentially along the optical axis transmission direction. The first lens, the second lens, the fourth lens, the sixth lens and the eighth lens are biconvex lenses, the third lens, the fifth lens and the seventh lens are biconcave lenses, the ninth lens is a meniscus negative lens with its convex surface facing the object side, and the tenth lens is a meniscus positive lens with its convex surface facing the object side. An aperture stop is provided between the third lens and the fourth lens, the second lens and the third lens are attached to each other, the fourth lens and the fifth lens are attached to each other, and the sixth lens and the seventh lens are attached to each other.

2. The 4K optical lens according to claim 1, characterized in that, The center thickness of the first lens is 7 mm, and the air gap between the first lens and the second lens is 0.32 mm. The center thickness of the second lens is 11.3 mm, the center thickness of the third lens is 7 mm, the air gap between the third lens and the aperture stop is 4.708 mm, and the air gap between the aperture stop and the fourth lens is 0.3 mm. The center thickness of the fourth lens is 8.2 mm, the center thickness of the fifth lens is 2 mm, and the air gap between the fifth lens and the sixth lens is 7.849 mm. The center thickness of the sixth lens is 8 mm, the center thickness of the seventh lens is 5.45 mm, and the air gap between the seventh lens and the eighth lens is 3.557 mm. The center thickness of the eighth lens is 8.45 mm, and the air gap between the eighth lens and the ninth lens is 3.514 mm; the center thickness of the ninth lens is 6.5 mm, the air gap between the ninth lens and the tenth lens is 2.197 mm, and the center thickness of the tenth lens is 6.3 mm.

3. The 4K optical lens according to claim 1, characterized in that, The first lens has a refractive index of 1.61 and a dispersion coefficient of 56.7; the second lens has a refractive index of 1.44 and a dispersion coefficient of 94.5; the third lens has a refractive index of 1.74 and a dispersion coefficient of 27.8; the fourth lens has a refractive index of 1.95 and a dispersion coefficient of 17.9; the fifth lens has a refractive index of 1.73 and a dispersion coefficient of 28.3; the sixth lens has a refractive index of 1.74 and a dispersion coefficient of 44.9; the seventh lens has a refractive index of 1.81 and a dispersion coefficient of 22.7; the eighth lens has a refractive index of 1.88 and a dispersion coefficient of 40.8; the ninth lens has a refractive index of 1.85 and a dispersion coefficient of 30; and the tenth lens has a refractive index of 2 and a dispersion coefficient of 25.

4.

4. The 4K optical lens according to claim 1, characterized in that, The object-side surface and image-side surface of all lenses from the first lens to the tenth lens are spherical.

5. An imaging device, characterized in that, Includes the 4K optical lens as described in any one of claims 1-4 and a detector for receiving the image formed by the 4K optical lens.

6. The imaging apparatus according to claim 5, characterized in that, The detector has 3840×2160 pixels and a pixel size of 2.9μm.

Images