Large-light-flux high-resolution ultra-wide-angle prime lens and electronic equipment

Abstract

The utility model discloses an ultra-wide-angle prime lens with large light transmission and high resolution and electronic equipment. The lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object plane to an image plane along an optical axis. The first lens has negative diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; the second lens has negative diopter, the object side surface of the lens is a concave surface, and the image side surface of the lens is a convex surface; the third lens has positive diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a plane or a convex surface; the fourth lens has positive diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface. According to the utility model, the effective focal length is 2.53 mm, the F is 1.6, and the distortion result is 1t; the ultra-wide-angle imaging lens is small in size, large in clear aperture, confocal in day and night, high in resolution and excellent in performance in high and low temperature environments.

Description

TECHNICAL FIELD

[0001] The utility model relates to fixed focus lens technical field especially relates to a big light -passing high resolving power super wide angle fixed focus lens and electronic equipment. BACKGROUND

[0002] 1 / 2.7" target surface imaging's super wide angle lens is widely used in vehicle data recorder, streaming media rearview mirror, security monitoring and some consumer electronic equipment. However, the existing this kind of lens exposes some problems to be solved in practical application.

[0003] Firstly, the total length of the lens is longer, which is a common problem. This not only makes it difficult to miniaturize the device, increasing the portability and integration difficulty of the product, but also in some space-limited application scenarios, such as unmanned aerial vehicle-mounted camera or ultra-thin mobile phone camera, the longer total length of the lens cannot meet the requirements of compact design, thereby limiting the innovation and diversification of the product.

[0004] Secondly, the small aperture seriously affects the imaging quality of the lens, especially in low light conditions. Smaller aperture means less light entering the lens, resulting in insufficient imaging brightness, increased noise, and thus affecting image clarity and detail presentation.

[0005] Thirdly, in practical application, the lens needs to maintain good focusing effect under different light conditions to ensure high-quality imaging throughout the day. However, the existing super wide angle lens often has difficulty maintaining a stable focal point position when switching between day and night, resulting in image blur or the need for frequent focus adjustment, which not only affects user experience, but also increases the energy consumption and maintenance cost of the device.

[0006] Finally, the low resolution directly relates to the image detail presentation and recognition ability. In some high-quality image application scenarios, such as face recognition, license plate recognition, etc., low-resolution lenses cannot provide enough image information, making it difficult to meet actual needs and limiting the development and application of related technologies.

[0007] In summary, the existing 1 / 2.7" target surface imaging super wide angle lens has certain limitations in structure design, optical performance and practical application effect, and it is urgent to overcome these shortcomings through technical innovation and optimization design to improve its overall performance and market competitiveness. SUMMARY

[0008] Therefore, the purpose of the utility model is to provide a super wide angle fixed focus lens with large light passing and high resolution and electronic equipment. The lens can at least solve the technical shortcomings mentioned in the background art.

[0009] According to one aspect of the utility model, provide a kind of big light passing high resolving power ultra-wide angle fixed focus lens, the lens is sequentially provided with first lens, second lens, third lens, fourth lens, fifth lens, sixth lens from object plane to image plane along optical axis;

[0010] The first lens has negative refractive power, the object side surface of the lens is convex, and the image side surface of the lens is concave.

[0011] The second lens has negative refractive power, the object side surface of the lens is concave, and the image side surface of the lens is convex.

[0012] The third lens has positive refractive power, the object side surface of the lens is convex, and the image side surface of the lens is a plane or convex.

[0013] The fourth lens has positive refractive power, the object side surface of the lens is convex, and the image side surface of the lens is convex.

[0014] The fifth lens has negative refractive power, the object side surface of the lens is concave, and the image side surface of the lens is concave.

[0015] The sixth lens has positive refractive power, the object side surface of the lens is convex, and the image side surface of the lens is convex.

[0016] In the above technical solution, the ultra-wide angle fixed focus lens designed by the patent has a wide application prospect in many fields such as vehicle recorders, streaming rearview mirrors, and security monitoring. With the increasing demand for ultra-wide angle lenses in these fields, there is an urgent need for a lens that can balance multiple excellent performance to meet the high-quality imaging needs in complex scenarios.

[0017] The ultra-wide angle imaging lens designed by the patent has the following characteristics and advantages:

[0018] 1. Excellent optical performance: The equivalent focal length (EFL) is 2.53 mm, and the maximum aperture (F value) reaches 1.66, which can achieve large light passing and ensure clear images in low light conditions. Distortion is controlled within the range of less than |-70.8%|, effectively reducing image distortion and ensuring the authenticity of the image.

[0019] 2. Small size: The small size design makes the lens suitable for space-limited application scenarios such as vehicle-mounted devices and portable monitoring devices.

[0020] 3. Day and night focus: It can maintain focus when switching between day and night, ensuring stable imaging quality throughout the day, without the need to adjust the focus due to changes in light, improving the convenience and reliability of use.

[0021] 4. High resolving power: It can capture clear and delicate image details, meeting the high-resolution imaging needs and being suitable for applications requiring high-precision images.

[0022] 5. Strong environmental adaptability: The performance remains excellent in high and low temperature environments, and the optical performance and mechanical structure reliability can be maintained stable under extreme temperature conditions, ensuring normal operation in various harsh environments.

[0023] 6. Optimal optical structure: The rear group adopts a positive-negative-positive Kirk three-piece imaging system, which can effectively correct chromatic aberration, spherical aberration, coma, and astigmatism, and improve imaging quality. At the same time, this structure can achieve a larger clear aperture while ensuring imaging quality, further improving the low-light performance of the lens.

[0024] In summary, the ultra-wide-angle prime lens designed in this patent can meet the market demand for high-performance, multi-purpose ultra-wide-angle lenses through reasonable optical structure design and performance optimization, and has significant technical advantages and application value.

[0025] In some embodiments, a diaphragm is disposed between the third lens and the fourth lens.

[0026] In the above technical solution, a diaphragm is disposed between the third lens and the fourth lens, so that there are three lenses in front of and behind the diaphragm. This symmetrical structure has the following advantages:

[0027] 1. Reduce coma: The symmetrical structure helps to balance the propagation path of light in the optical system, reducing the generation of coma.

[0028] 2. Reduce sagittal chromatic aberration: The symmetrical structure helps to correct sagittal chromatic aberration, ensuring that light of different wavelengths can be more accurately focused on the imaging plane, improving the color accuracy and clarity of the image.

[0029] 3. Optimize light distribution: The symmetrical layout of three lenses in front of and behind the diaphragm helps to uniformly guide light through the lens, reducing light scattering and reflection, and improving light utilization and imaging uniformity.

[0030] In summary, by disposing a diaphragm between the third lens and the fourth lens, a symmetrical structure with three lenses in front of and behind the diaphragm can effectively reduce the coma and sagittal chromatic aberration of the system, optimize the light distribution, and enhance the stability of the optical performance, thereby significantly improving the overall imaging quality of the ultra-wide-angle prime lens.

[0031] In some embodiments, the first lens uses a negative power meniscus lens bent towards the diaphragm.

[0032] In the above technical solution, the first lens uses a negative power meniscus lens bent towards the diaphragm, which has the following advantages:

[0033] 1. Reduce the angle of the outgoing light rays: For light rays with large incident angles, this design can effectively reduce the corresponding outgoing light ray angles. This helps to optimize the propagation path of light rays within the lens, reducing the refraction and reflection of light in subsequent lenses, and improving the utilization of light and the uniformity of the image.

[0034] 2. Expand the field of view (FOV): With this design, the field of view (FOV) of the lens can reach 153°, suitable for applications that require ultra-wide-angle imaging, such as vehicle recorders and security monitoring.

[0035] 3. Reduce coma and spherical aberration: The design of the curved stop helps to balance the propagation of light in the optical system, reducing the generation of coma and spherical aberration, which can effectively reduce these aberrations and improve the overall imaging quality.

[0036] 4. Optimize light focusing: The design of the negative focal power meniscus lens helps to optimize the focusing characteristics of light, ensuring that light can be more accurately focused on the imaging plane, improving the sharpness and clarity of the image.

[0037] In summary, the first lens adopts a negative focal power meniscus lens design with a curved stop, which not only reduces the outgoing angle of light rays with large incident angles, expands the field of view of the lens, but also effectively reduces the coma and spherical aberration of the system, thereby significantly improving the optical performance and imaging quality of the ultra-wide-angle prime lens.

[0038] In some embodiments, the first lens and the third lens are both glass spherical lenses, and the rest are plastic aspherical lenses.

[0039] In the above technical solution, the first lens and the third lens are both glass spherical lenses, and the rest are plastic aspherical lenses. This design balances the cost control and system performance, with the following advantages:

[0040] 1. Cost control: The use of glass spherical lenses combined with plastic aspherical lenses can effectively reduce the manufacturing cost of the lens while ensuring optical performance. Glass spherical lenses have good optical stability and durability, suitable for parts with high optical performance requirements; while plastic aspherical lenses have the advantages of low cost, light weight, and easy mass production.

[0041] 2. Optimize optical performance: The use of four plastic aspherical lenses can significantly reduce the spherical aberration of the system. Spherical aberration can cause inaccurate focusing of light on the imaging plane, affecting image clarity. Aspherical lenses can provide more precise control of light, optimizing light focusing characteristics and improving imaging quality.

[0042] 3. Improve lens efficiency: By reasonably matching glass and plastic lenses, the advantages of each can be fully utilized to improve the efficiency of the entire optical system. Glass lenses provide stable optical performance in key positions, while plastic aspheric lenses correct and optimize optical aberrations in other positions, allowing each lens to perform its best.

[0043] 4. Reduce system length: Plastic aspheric lenses have high design flexibility and can control complex light in a small space. By using four plastic aspheric lenses, the overall length of the lens system can be effectively reduced without sacrificing optical performance, making the lens more compact and lightweight.

[0044] In summary, the design scheme of using glass spherical lenses for the first and third lenses and plastic aspheric lenses for the remaining lenses can effectively reduce lens cost while ensuring system performance. The use of plastic aspheric lenses reduces the system's spherical aberration, improves lens efficiency, and reduces system length, achieving an optimal balance between cost and performance.

[0045] In some embodiments, the lens satisfies the following conditional expression:

[0046] Vd4-Vd5>30; Vd6-Vd5>30

[0047] In the formula, Vd4 is the dispersion coefficient of the fourth lens; Vd5 is the dispersion coefficient of the fifth lens; Vd6 is the dispersion coefficient of the sixth lens;

[0048] In the above technical solution, the use of materials with a dispersion coefficient difference greater than 30 can effectively correct the on-axis chromatic aberration and off-axis chromatic aberration of the system. Specifically:

[0049] 1. Correct on-axis chromatic aberration: On-axis chromatic aberration is caused by different wavelengths of light focusing at different positions in the optical system. By using materials with a large dispersion coefficient difference, the focusing characteristics of different wavelengths of light can be balanced, allowing them to focus more accurately on the imaging plane, thereby reducing on-axis chromatic aberration.

[0050] 2. Correct off-axis chromatic aberration: Off-axis chromatic aberration causes color edges on the edges of the image, affecting image clarity and color accuracy. Materials with a large dispersion coefficient difference can optimize the propagation path of light at different wavelengths, reducing the generation of off-axis chromatic aberration and improving the edge clarity and color accuracy of the image.

[0051] 3. Improve imaging quality: By reasonably selecting and matching materials with different dispersion coefficients, the imaging quality of the entire optical system can be significantly improved. This design helps achieve high resolution and low aberration in ultra-wide-angle lenses, ensuring that the center and edges of the image remain clear and delicate.

[0052] In summary, by satisfying the condition formula Vd4-Vd5>30 and Vd6-Vd5>30, the material matching with a dispersion coefficient difference greater than 30 can effectively correct the on-axis chromatic aberration and the off-axis chromatic aberration of the system, thereby significantly improving the optical performance and imaging quality of the ultra-wide-angle fixed-focus lens.

[0053] According to another aspect of the present application, an ultra-wide-angle fixed-focus lens with large light transmission and high resolution is provided, which comprises a lens group arranged in a lens frame.

[0054] In the above technical solution, the advantages of the fixed-focus lens depend on the ultra-wide-angle fixed-focus lens with large light transmission and high resolution, which will not be described here.

[0055] In some embodiments, a back adhesive SOM sheet and a sealing ring are arranged between the first lens and the second lens.

[0056] The second lens and the third lens, and the fourth lens and the fifth lens are both provided with aluminum spacer rings.

[0057] In the above technical solution, the back adhesive SOM sheet and the sealing ring can effectively prevent external dust particles, moisture and other small impurities from entering the internal structure of the lens, providing comprehensive protection for the optical elements, preventing pollution and erosion, thereby significantly prolonging the service life of the lens. The application of the sealing ring strengthens the sealing performance of the lens, so that it can maintain stable performance in harsh environmental conditions such as high humidity and high dust concentration, ensuring its reliability and stability are not disturbed by environmental factors.

[0058] The assembly of the aluminum spacer ring can accurately control the spacing distance between adjacent lenses, ensuring that the design parameters of the optical system are accurately implemented and meet the strict requirements of optical performance. At the same time, the aluminum spacer ring provides reliable mechanical support for the lens structure, enhancing the overall structural stability of the lens. When the lens is subjected to external force impact or vibration, the aluminum spacer ring can effectively protect the stability of the relative position and shape of the optical elements, avoid the decline of imaging quality caused by element displacement or deformation, and ensure that the lens can still maintain stable imaging effect in complex mechanical environment.

[0059] In addition, the aluminum material has good thermal stability as a material with excellent performance, and can keep the shape and size of the aluminum material spacer relatively stable under temperature change conditions, and cannot have significant size deviation due to thermal expansion and cold shrinkage effect, effectively avoiding the change of lens spacing caused by temperature fluctuation, thereby ensuring that the lens can maintain accurate optical performance under various temperature conditions, ensuring the consistency and stability of the imaging quality, and meeting the application requirements of high-precision optical systems.

[0060] In some embodiments, a diaphragm is arranged between the third lens and the fourth lens; and SOM sheets are arranged at the diaphragm position, between the fifth lens and the sixth lens.

[0061] In the above technical solution, the SOM sheets arranged at the diaphragm position and between the fifth lens and the sixth lens can improve the sealing performance of the lens, prevent impurities such as dust and moisture in the external environment from entering the inside of the lens, protect the cleanliness and corrosion resistance of the optical elements, and prolong the service life of the lens.

[0062] In some embodiments, the outer wall of the lens frame is provided with a threaded interface.

[0063] In the above technical solution, by arranging the threaded interface on the outer wall of the lens frame, the ultra-wide-angle fixed-focus lens can better adapt to various use scenarios, improve the versatility, stability and convenience of the lens, reduce the use cost, and expand the application range.

[0064] According to another aspect of the present application, an electronic device is provided, an ultra-wide-angle fixed-focus lens with large light transmission and high resolution; and

[0065] An image sensor configured to receive an image formed by the ultra-wide-angle fixed-focus lens with large light transmission and high resolution.

[0066] In the above technical solution, the advantages of the electronic device depend on the ultra-wide-angle fixed-focus lens with large light transmission and high resolution, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0067] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0068] Figure 1 is a structural schematic diagram of an example 1 of the ultra-wide-angle fixed-focus lens of the present application;

[0069] Figure 2Is the visible light MTF curve diagram of the ultra-wide-angle fixed focus lens example 1 of the utility model;

[0070] Figure 3 Is the 850nm near-infrared light MTF diagram of the ultra-wide-angle fixed focus lens example 1 of the utility model;

[0071] Figure 4 Is the curve diagram of the axial chromatic aberration of the ultra-wide-angle fixed focus lens example 1 of the utility model;

[0072] Figure 5 Is the curve diagram of the on-axis chromatic aberration of the ultra-wide-angle fixed focus lens example 1 of the utility model;

[0073] Figure 6 Is the structure schematic diagram of the ultra-wide-angle fixed focus lens example 2 of the utility model;

[0074] Figure 7 Is the visible light MTF curve diagram of the ultra-wide-angle fixed focus lens example 2 of the utility model;

[0075] Figure 8 Is the 850nm near-infrared light MTF diagram of the ultra-wide-angle fixed focus lens example 2 of the utility model;

[0076] Figure 9 Is the curve diagram of the axial chromatic aberration of the ultra-wide-angle fixed focus lens example 2 of the utility model;

[0077] Figure 10 Is the curve diagram of the on-axis chromatic aberration of the ultra-wide-angle fixed focus lens example 2 of the utility model;

[0078] Figure 11 Is the structure schematic diagram of the ultra-wide-angle fixed focus lens example 3 of the utility model;

[0079] Figure 12 Is the visible light MTF curve diagram of the ultra-wide-angle fixed focus lens example 3 of the utility model;

[0080] Figure 13 Is the 850nm near-infrared light MTF diagram of the ultra-wide-angle fixed focus lens example 3 of the utility model;

[0081] Figure 14 Is the curve diagram of the axial chromatic aberration of the ultra-wide-angle fixed focus lens example 3 of the utility model;

[0082] Figure 15 Is the curve diagram of the on-axis chromatic aberration of the ultra-wide-angle fixed focus lens example 3 of the utility model;

[0083] Figure 16 Is the structure schematic diagram of the ultra-wide-angle fixed focus lens example 4 of the utility model;

[0084] Figure 17 Is the structure schematic diagram of the electronic equipment example 5 of the utility model. DETAILED DESCRIPTION

[0085] The utility model will be described in further detail below in connection with the drawings and examples. It is particularly pointed out that the following examples are only used for illustrating the utility model, but do not limit the scope of the utility model. Similarly, the following examples are only part of the embodiments of the utility model rather than all the embodiments, and all other embodiments obtained by the ordinary skilled in the art without making creative efforts belong to the scope of protection of the utility model.

[0086] The utility model discloses a kind of ultra-wide-angle fixed focus lenses with high optical performance and large light pass, and electronic equipment.The embodiment according to the utility model will be described in detail with reference to the drawings.

[0087] Figure 1 、 Figure 6 、 Figure 11 It is respectively according to the sectional view of the large light pass high resolving power ultra-wide-angle fixed focus lens (optical system) of example 1 to 3. The large light pass high resolving power ultra-wide-angle fixed focus lens according to each example is used for including such as digital video camera, digital still camera, broadcast camera, monitoring camera etc. camera equipment and replaceable lens optical equipment. In each sectional view, left side is object side OBJ and right side is image side IMA. In each sectional view, Li indicates the i th lens, ST indicates diaphragm (fixed diaphragm or visible diaphragm), OA indicates optical axis, G1 indicates filter & protective sheet. IMA indicates image plane, and when the large light pass high resolving power ultra-wide-angle fixed focus lens 1 to 4 according to each example is used for the camera optical system of digital video camera or digital still camera, solid-state camera element (photoelectric conversion element) such as CMOS image sensor or CCD image sensor is arranged on camera plane IMA.

[0088] The large light pass high resolving power ultra-wide-angle fixed focus lens according to each example, the lens is sequentially provided with first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6 along optical axis OA from object plane to image plane;

[0089] The first lens L1 has negative refractive power, the object side surface of the lens is convex, and the image side surface of the lens is concave;

[0090] The second lens L2 has negative refractive power, the object side surface of the lens is concave, and the image side surface of the lens is convex;

[0091] The third lens L3 has positive refractive power, the object side surface of the lens is convex, and the image side surface of the lens is plane or convex;

[0092] The fourth lens L4 has positive refractive power, the object side surface of the lens is convex, and the image side surface of the lens is convex;

[0093] The fifth lens L5 has a negative refractive power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a concave surface;

[0094] The sixth lens L6 has a positive refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface.

[0095] The third lens L3 and the fourth lens L4 are provided with a diaphragm.

[0096] The first lens L1 uses a negative focal power meniscus lens bent towards the diaphragm.

[0097] The first lens L1 and the third lens L3 are both glass spherical lenses, and the rest are plastic aspherical lenses.

[0098] The lens satisfies the following conditional expression:

[0099] Vd4-Vd5>30; Vd6-Vd5>30

[0100] In the formula, Vd4 is the dispersion coefficient of the fourth lens L4; Vd5 is the dispersion coefficient of the fifth lens L5; and Vd6 is the dispersion coefficient of the sixth lens L6.

[0101] A detailed description of the super-wide-angle fixed-focus lens with large through-light and high resolution according to various examples will now be given.

[0102] The optical structure of Example 1 is shown in Figure 1 The specific parameters of Example 1 are shown in Table 1 and Table 2. In Example 1, the effective focal length EFL of the lens is 2.53 mm, the field of view FOV is ≥153°, the total optical length TTL is <16.9 mm, the light aperture F is 1.6, and the distortion is <|-70.8%|.

[0103] Table 1 shows the parameter table of Example 1

[0104]

[0105] Table 2 shows the aspherical surface coefficient table of Example 1

[0106]

[0107]

[0108] Figure 2 For Example 1, the visible light MTF curve diagram shows that the full field of view MTF is greater than 0.5 at 125 lp / mm, meeting 1 / 2.8" image 4K high-definition imaging.

[0109] Figure 3As shown in the visible light MTF curve of Example 1, the full field MTF is greater than 0.5 at 125 lp / mm, meeting the 1 / 2.8" image 4K high-definition imaging.

[0110] Figure 4 As shown in the vertical axis chromatic aberration curve of Example 1, the vertical axis chromatic aberration of each wavelength is less than 4 um, and the vertical axis chromatic aberration correction effect is good.

[0111] Figure 5 As shown in the on-axis chromatic aberration curve of Example 1, the on-axis chromatic aberration of each wavelength is relatively concentrated at different aperture positions, and the difference from the main wavelength is less than 0.02 mm, and the on-axis chromatic aberration correction effect is good.

[0112] The optical structure of Example 2 is shown in Figure 6 The specific parameters of Example 2 are shown in Table 3 and Table 4. In Example 2, the effective focal length EFL of the lens is 2.53m, the field of view FOV is greater than 153°, the total optical length TTL is less than 16.9mm, the light aperture F1.6, and the distortion is less than |-70.8%.

[0113] Table 3 shows the parameters of Example 2.

[0114]

[0115]

[0116] Table 4 shows the aspheric surface coefficient table of Example 2.

[0117]

[0118] Figure 7 As shown in the visible light MTF curve of Example 2, the full field MTF is greater than 0.5 at 125 lp / mm, meeting the 1 / 2.8" image 4K high-definition imaging.

[0119] Figure 8 As shown in the visible light MTF curve of Example 2, the full field MTF is greater than 0.5 at 125 lp / mm, meeting the 1 / 2.8" image 4K high-definition imaging.

[0120] Figure 9 As shown in the vertical axis chromatic aberration curve of Example 2, the vertical axis chromatic aberration of each wavelength is less than 4 um, and the vertical axis chromatic aberration correction effect is good.

[0121] Figure 10 As shown in the on-axis chromatic aberration curve of Example 2, the on-axis chromatic aberration of each wavelength is relatively concentrated at different aperture positions, and the difference from the main wavelength is less than 0.02 mm, and the on-axis chromatic aberration correction effect is good.

[0122] The optical structure of Example 3 is shown inFigure 11 The specific parameters of Example 3 are shown in Table 5 and Table 6. In Example 3, the effective focal length EFL is 2.53m, the field of view FOV is ≥153°, the total track length TTL is <16.9mm, the clear aperture is F1.6, and the distortion is <|-70.8%|.

[0123] Table 5: Example 3 Parameter Table

[0124]

[0125] Table 6: Example 3 Aspheric Surface Coefficient Table

[0126]

[0127]

[0128] Figure 12 For Example 3, the visible light MTF curve shows that the full field of view MTF is greater than 0.5 at 125lp / mm, meeting the 1 / 2.8" image plane 4K high-definition imaging requirements.

[0129] Figure 13 For Example 3, the 850nm near-infrared light MTF graph shows that the full field of view MTF is greater than 0.5 at 125lp / mm, meeting the 1 / 2.8" image plane 4K high-definition imaging requirements, and the infrared imaging is not out of focus, with good day and night focusing effect.

[0130] Figure 14 For Example 3, the axial chromatic aberration curve shows that the axial chromatic aberration of each wavelength is less than 4um, and the axial chromatic aberration correction effect is good.

[0131] Figure 15 For Example 3, the on-axis chromatic aberration curve shows that the on-axis chromatic aberration of each wavelength is relatively concentrated at different aperture positions, and the difference from the main wavelength is less than 0.02mm, with good on-axis chromatic aberration correction effect.

[0132] Based on Examples 1 to 3, the present application has the following advantages:

[0133] 1. Wide shooting range: FOV ≥153°, capable of capturing a wide range of scenes, suitable for applications requiring a large field of view, such as security monitoring and vehicle recorders.

[0134] 2. Small size: TTL <16.9mm, the overall design of the lens is compact and small, suitable for space-limited application scenarios.

[0135] 3. Low-light high-definition imaging: The design clear aperture reaches F1.6, which can still maintain high-definition color imaging in low-light conditions, ensuring clear images even in low-light conditions.

[0136] 4. Excellent imaging quality: MTF is greater than 0.5 at 125 lp / mm frequency in full field of view under visible light and 850 nm near-infrared light, meets 1 / 2.7" image plane 4K high-definition imaging, and has good day and night confocal performance, ensuring the definition and sharpness of the image.

[0137] 5. Stable optical performance: EFL is 2.53m, meets distortion <|-70.8%|, has high imaging quality, high illumination, small volume, low cost, and no imaging defocus under high and low temperature working environment, ensuring the reliability of the lens under various environments.

[0138] Example 4

[0139] Reference will now be made to Figure 16 A description of a large-aperture high-resolution super-wide-angle fixed-focus lens according to Example 4 of the present application will be given. Figure 16 is a schematic diagram of a large-aperture high-resolution super-wide-angle fixed-focus lens according to any one of the large-aperture high-resolution super-wide-angle fixed-focus lenses according to Examples 1 to 3 for a lens group. In the figure, 1: compression ring; 2: first lens; 3: second lens; 4: third lens; 5: first aluminum spacer; 6: sealing ring; 7: lens frame; 8: second aluminum spacer; 9: fourth lens; 10: fifth lens; 11: sixth lens; 12: third aluminum spacer; 13: glue groove.

[0140] The large-aperture high-resolution super-wide-angle fixed-focus lens according to Example 4 includes a lens group arranged inside the lens frame 7, the lens group is sequentially provided with a first lens 2, a second lens 3, a third lens 4, a fourth lens 9, a fifth lens 10, and a sixth lens 11 along the optical axis from the object plane to the image plane, the first lens and the third lens are glass spherical lenses, and the rest are plastic aspherical lenses, which can effectively reduce the cost of the lens while maintaining the system performance.

[0141] The first lens has a negative refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface;

[0142] The second lens has a negative refractive power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a convex surface;

[0143] The third lens has a positive refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a plane or a convex surface;

[0144] The fourth lens has a positive refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface;

[0145] The fifth lens has a negative refractive power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a concave surface;

[0146] The sixth lens has a positive refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface;

[0147] In the present example 4, the diaphragm is located on the object plane surface of the fourth lens 9. In order to meet the lens light requirement, the SOM sheet is used to block light here, instead of the metal spacer structure, because the interval is too small, the spacer design light blocking structure is prone to deformation, and there is a risk of interference during assembly, so the SOM sheet is selected to block light; the spacer back glue SOM sheet and the O-shaped sealing ring between the first lens 2 and the second lens 3; the back glue Mylar sheet plays a role in blocking light, reducing stray light generation, and ensuring imaging quality. The advantage of back gluing is that it can be directly positioned and bonded with the first lens by a jig, and will not interfere with the sealing ring. The O-shaped sealing ring can ensure the stability of the lens air tightness here. The glue groove 13 is arranged between the pressing ring 1 and the frame 7. The main purpose of the glue groove 13 here is to attach silicone rubber here, which can make the lens have the functions of waterproof and dustproof after curing. The first aluminum pressing ring 5, the second aluminum pressing ring 8 and the third aluminum pressing ring 12 are internally designed with steps and light extinction lines. The purpose is to effectively prevent plane reflection from causing lens to appear stray light and ghost image by designing steps and light extinction lines on the pressing ring inclined surface close to parallel light; the front outer diameter of the lens is 18mm, the tail interface is M12*0.5, and the total length of the structure is 13.4mm<L1<13.7mm. The M12 threaded interface is opened on the outer wall of the frame, which can be matched with different bases to adapt to more use scenarios; the negative focal length meniscus lens of the first lens bending towards the diaphragm can reduce the angle of the exit light corresponding to the large incidence angle of light, so that the FOV of the lens reaches 153°, and the design of the diaphragm bending towards the diaphragm reduces the coma and spherical aberration of the system; the diaphragm is located between the third lens and the fourth lens, so that there are three lenses in front and back of the diaphragm, and the symmetrical structure can reduce the coma and axial chromatic aberration of the system; four plastic aspheric lenses are used to reduce the spherical aberration of the system, improve the use efficiency of the lens, and reduce the length of the system; the materials with a dispersion coefficient difference greater than 30 are matched to correct the on-axis chromatic aberration and the vertical chromatic aberration of the system; the positive-negative-positive Kirk three-piece imaging system is used in the rear group, which can correct the chromatic aberration, spherical aberration, coma and astigmatism of the system, and can achieve a larger light aperture while ensuring the imaging quality.

[0148] Example 5

[0149] Reference will now be made to Figure 17 A description of the electronic device A according to example 5 of the present application will be given. Figure 17 is a schematic diagram of an electronic device (industrial camera) using any one of the large-aperture high-resolution super-wide-angle fixed-focus lenses according to examples 1 to 3 for a camera optical system. In Figure 17In the figure, reference sign A2 denotes an electronic device main body, and reference sign Al denotes an image pickup optical system (interchangeable lens) including any one of the large-aperture high-resolution super-wide-angle fixed focal length lenses according to Examples 1 to 3. Reference sign A3 denotes an image sensor (photoelectric conversion element) such as a CMOS image sensor or a CCD image sensor, which is built in the camera main body A2 and receives light (optical image formed through the image pickup optical system Al) from the image pickup optical system Al and performs photoelectric conversion. By using the large-aperture high-resolution super-wide-angle fixed focal length lens according to any one of Examples 1 to 3 for an electronic device such as a digital still camera, an electronic device of the large-aperture high-resolution super-wide-angle fixed focal length lens with high optical performance can be obtained. Each of the examples can provide an electronic device with high optical performance.

[0150] While the application has been described with reference to typical embodiments, it will be understood that the application is not limited to the specific embodiments disclosed. The scope of the following claims will be given the broadest interpretation to encompass all such modifications and equivalent structures and functions.

Claims

1. An ultra-wide-angle fixed focus lens with large through- aperture high resolution, characterized in that, The lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object plane to an image plane. The first lens has a negative refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface. The second lens has a negative refractive power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a convex surface. The third lens has a positive refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a plane or a convex surface. The fourth lens has a positive refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface. The fifth lens has a negative refractive power, the object side surface of the lens is a concave surface, and the image side surface of the lens is a concave surface. The sixth lens has a positive refractive power, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface.

2. The ultra-wide-angle fixed-focus lens with large aperture and high resolution according to claim 1, wherein a diaphragm is arranged between the third lens and the fourth lens.

3. The ultra-wide-angle fixed-focus lens with large aperture and high resolution according to claim 1 or 2, wherein the first lens uses a negative-power meniscus lens bent towards the diaphragm.

4. The ultra-wide-angle fixed-focus lens with large aperture and high resolution according to claim 1, wherein the first lens and the third lens are glass spherical lenses, and the rest are plastic aspherical lenses.

5. The ultra-wide-angle fixed-focus lens with large aperture and high resolution according to claim 1, wherein the lens satisfies the following conditional expressions: Vd4-Vd5>30; Vd6-Vd5>30 wherein Vd4 is the dispersion coefficient of the fourth lens, Vd5 is the dispersion coefficient of the fifth lens, and Vd6 is the dispersion coefficient of the sixth lens. The lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object plane to an image plane.

7. The ultra-wide-angle fixed-focus lens with large aperture and high resolution according to claim 6, wherein a back adhesive SOM sheet and a sealing ring are arranged between the first lens and the second lens.

8. The ultra-wide-angle fixed-focus lens with large aperture and high resolution according to claim 6, wherein a diaphragm is arranged between the third lens and the fourth lens, and SOM sheets are arranged at the positions of the diaphragm, the fifth lens and the sixth lens.

9. The ultra-wide-angle fixed-focus lens with large aperture and high resolution according to claim 6, wherein a threaded interface is arranged on the outer wall of the lens frame.

6. An ultra-wide angle fixed focus lens with large through- aperture high resolution, characterized in that, The lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens along an optical axis from an object plane to an image plane. An image sensor configured to receive an image formed by the ultra-wide-angle fixed-focus lens with large aperture and high resolution. ​ ​ ​ ​ ​ ​ 10. An electronic device, comprising: ​ ​

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