Optical lens and imaging device

Abstract

The utility model discloses an optical lens and imaging device, optical lens includes first lens, second lens, third lens, fourth lens, fifth lens, sixth lens and seventh lens in order along the optical axis from object plane to image surface, first lens, second lens, fourth lens and six lenses are all negative power lens, third lens, fifth lens and seventh lens are all positive power lens, the power of first lens is phi 1, the power of second lens is phi 2, the power of third lens is phi 3, the power of fourth lens is phi 4, the power of fifth lens is phi 5, the power of sixth lens is phi 6, the power of seventh lens is phi 7, the power of optical lens is phi, wherein, -0.3phi 1 / phi is -0.2, -0.5phi 2 / phi is -0.35, 0.3phi 3 / phi is 0.5, -0.5phi 4 / phi is -0.4, 0.75phi 5 / phi is 0.85, -0.5phi 6 / phi is -0.4, 0.2phi 7 / phi is 0.3. Through the reasonable setting lens number in optical lens, the power of each lens and its relative position are optimized, while meeting the imaging quality requirement, the balanced design of compact structure, big aperture is realized.

Description

Technical Field

[0001] This utility model relates to the field of optical device technology, and in particular to an optical lens and imaging device. Background Technology

[0002] With the rapid development of society, economy, and technology, automotive video systems are becoming increasingly widespread and sophisticated. Vehicle-mounted lenses are widely used at the front, rear, sides, and interior of vehicles. As the demand for monitoring road conditions increases, the performance requirements for panoramic lenses are also rising. Currently, optical lenses used for driver warning systems require smaller size, higher resolution, and larger apertures. However, current panoramic automotive lenses still suffer from shortcomings such as lower resolution, size limitations, high cost, and smaller apertures, necessitating further technological advancements. Utility Model Content

[0003] This invention provides an optical lens and imaging device that enables the design of an optical lens with high resolution, compact structure, and large aperture.

[0004] In a first aspect, the present invention provides an optical lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object plane to the image plane;

[0005] The first lens, the second lens, the fourth lens, and the sixth lens are all negative power lenses, while the third lens, the fifth lens, and the seventh lens are all positive power lenses.

[0006] The optical power of the first lens is φ1, the optical power of the second lens is φ2, the optical power of the third lens is φ3, the optical power of the fourth lens is φ4, the optical power of the fifth lens is φ5, the optical power of the sixth lens is φ6, the optical power of the seventh lens is φ7, and the optical power of the optical lens is φ.

[0007] Among them, -0.3≤φ1 / φ≤-0.2, -0.5≤φ2 / φ≤-0.35, 0.3≤φ3 / φ≤0.5, -0.5≤φ4 / φ≤-0.4, 0.75≤φ5 / φ≤0.85, -0.5≤φ6 / φ≤-0.4, and 0.2≤φ7 / φ≤0.3.

[0008] Optionally, the optical aperture of the first lens is D, and the image height corresponding to the maximum field of view of the optical lens is ImgH;

[0009] Among them, 2.2≤D / ImgH≤2.5.

[0010] Optionally, the optical lens has an aperture of FNO and a total optical length of TTL;

[0011] Wherein, 0.077≤FNO / TTL≤0.117.

[0012] Optionally, the first lens includes a first object-side surface near the object surface and a first image-side surface near the image surface, wherein the first object-side surface is convex and the first image-side surface is concave.

[0013] The second lens includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface and the second image-side surface are concave.

[0014] The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is convex.

[0015] The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is concave, and the fourth image-side surface is convex.

[0016] The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is convex, and the fifth image-side surface is convex.

[0017] The sixth lens includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane. The sixth object-side surface is concave, and the sixth image-side surface is convex.

[0018] The seventh lens includes a seventh object-side surface near the object plane and a seventh image-side surface near the image plane. The seventh object-side surface is concave, and the seventh image-side surface is convex.

[0019] Optionally, the refractive index of the first lens is n1, the refractive index of the second lens is n2, the refractive index of the third lens is n3, the refractive index of the fourth lens is n4, the refractive index of the fifth lens is n5, the refractive index of the sixth lens is n6, and the refractive index of the seventh lens is n7.

[0020] Among them, 1.81 <n1<2.01,1.41<n2<1.61,1.85<n3<2.05,1.54<n4<1.74,0.83≤n5 / n6≤1.06,1.44<n7<1.64。

[0021] Optionally, the fifth lens and the sixth lens are cemented together.

[0022] Optionally, the Abbe number of the fifth lens is VD5, and the Abbe number of the sixth lens is VD6;

[0023] Among them, VD5-VD6 > 30.

[0024] Optionally, the first lens and the third lens are both glass spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses.

[0025] Optionally, the optical lens may also include an aperture stop and a filter;

[0026] The aperture stop is disposed in the optical path between the third lens and the fourth lens, or in the optical path between the fourth lens and the fifth lens;

[0027] The filter is disposed in the optical path between the seventh lens and the image plane.

[0028] Secondly, this utility model embodiment also provides an imaging device, including the optical lens described in the first aspect above.

[0029] The optical lens provided by this invention comprises seven lenses with varying optical powers. By rationally setting the number of lenses, the overall length of the optical lens can be ensured to be appropriate, achieving a relatively miniaturized design while maintaining low imaging aberrations and high image quality. Furthermore, the optical powers of the seven lenses are arranged in a negative-negative-positive-negative-positive-negative-positive pattern. This rational arrangement of the seven lenses' optical powers increases the aperture of the optical lens and improves its imaging resolution. Moreover, by rationally setting the ratio between the optical powers of each lens and the overall lens power, the lens design can be further optimized, off-axis aberrations corrected, spherical and chromatic aberration corrected, field curvature optimized, and image quality further improved.

[0030] It should be understood that the description in this section is not intended to identify key or essential features of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily apparent from the following description. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1This is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of this utility model;

[0033] Figure 2 This is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of this utility model;

[0034] Figure 3 This is a schematic diagram of the structure of the optical lens provided in Embodiment 3 of this utility model;

[0035] Figure 4 A schematic diagram of the field curvature and distortion of the optical lens provided in Embodiment 1 of this utility model;

[0036] Figure 5 A schematic diagram of the vertical axis aberration of the optical lens provided in Embodiment 1 of this utility model;

[0037] Figure 6 A schematic diagram of the light fan of the optical lens provided in Embodiment 1 of this utility model;

[0038] Figure 7 A schematic diagram of field curvature and distortion of the optical lens provided in Embodiment 2 of this utility model;

[0039] Figure 8 A schematic diagram of the vertical axis aberration of the optical lens provided in Embodiment 2 of this utility model;

[0040] Figure 9 This is a schematic diagram of the light fan of the optical lens provided in Embodiment 2 of this utility model;

[0041] Figure 10 A schematic diagram of field curvature and distortion of the optical lens provided in Embodiment 3 of this utility model;

[0042] Figure 11 A schematic diagram of the vertical axis aberration of the optical lens provided in Embodiment 3 of this utility model;

[0043] Figure 12 This is a schematic diagram of the light fan of the optical lens provided in Embodiment 3 of this utility model. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0045] Figure 1This is a schematic diagram of the structure of the optical lens provided in Embodiment 1 of this utility model. Figure 2 This is a schematic diagram of the structure of the optical lens provided in Embodiment 2 of this utility model. Figure 3 This is a schematic diagram of the structure of the optical lens provided in Embodiment 3 of this utility model, combined with... Figure 1 , Figure 2 and Figure 3 As shown, the optical lens provided in this embodiment of the present invention includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, and a seventh lens 107 arranged sequentially along the optical axis from the object plane to the image plane; the first lens 101, the second lens 102, the fourth lens 104, and the sixth lens 106 are all negative power lenses, while the third lens 103, the fifth lens 105, and the seventh lens 107 are all positive power lenses; the optical power of the first lens 101 is φ1, and the optical power of the second lens 102 is φ2. The optical power of the third lens 103 is φ3, the optical power of the fourth lens 104 is φ4, the optical power of the fifth lens 105 is φ5, the optical power of the sixth lens 106 is φ6, the optical power of the seventh lens 107 is φ7, and the optical power of the optical lens is φ; wherein, -0.3≤φ1 / φ≤-0.2, -0.5≤φ2 / φ≤-0.35, 0.3≤φ3 / φ≤0.5, -0.5≤φ4 / φ≤-0.4, 0.75≤φ5 / φ≤0.85, -0.5≤φ6 / φ≤-0.4, and 0.2≤φ7 / φ≤0.3.

[0046] Specifically, the optical lens provided in this embodiment includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, a fifth lens 105, a sixth lens 106, and a seventh lens 107. That is, the optical lens includes seven lenses with optical power. The arrangement of seven lenses ensures that the number of lenses in the optical system is reasonable. Too many lenses will result in a large lens size, and too few lenses will result in large aberrations due to a single lens bearing a large optical power. This ensures that the optical system is miniaturized while ensuring small imaging aberrations and high imaging quality.

[0047] Furthermore, optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, characterizing the optical system's ability to deflect light. The larger the absolute value of the optical power, the stronger the bending ability of light; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light is converging; when the optical power is negative, the refraction of light is diverging. In this embodiment, both the first lens 101 and the second lens 102 are negative optical power lenses. The first lens 101 and the second lens 102, as the lenses that first adjust the incident light in the optical lens, have a negative optical power setting that ensures a larger aperture before the light enters the aperture stop, increasing the aperture of the optical lens and enabling the lens to still produce clear images under dim or dark conditions. The third lens 103, with positive optical power, can promptly correct the large aberrations produced by the first lens 101 and the second lens 102, especially significantly correcting the edge aberrations of the optical lens, thereby improving the imaging resolution of the optical system. Furthermore, the optical power of the fourth lens 104 is negative, the optical power of the fifth lens 105 is positive, the optical power of the sixth lens 106 is negative, and the optical power of the seventh lens 107 is positive. The optical power of each subsequent lens in the optical path is different from that of the preceding lens, which is beneficial for aberration correction.

[0048] Furthermore, the optical power φ1 of the first lens 101, the optical power φ2 of the second lens 102, the optical power φ3 of the third lens 103, the optical power φ4 of the fourth lens 104, the optical power φ5 of the fifth lens 105, the optical power φ6 of the sixth lens 106, and the optical power φ7 of the seventh lens 107 satisfy the following relationships with the optical power φ of the optical lens: -0.3≤φ1 / φ≤-0.2, -0.5≤φ2 / φ≤-0.35, 0.3≤φ 3 / φ≤0.5, -0.5≤φ4 / φ≤-0.4, 0.75≤φ5 / φ≤0.85, -0.5≤φ6 / φ≤-0.4, 0.2≤φ7 / φ≤0.3. By further limiting the ratio between the optical power of each lens and the optical power of the lens, the optical path can be further optimized, the light propagation path can be adjusted, off-axis aberrations can be fully corrected, spherical aberration and chromatic aberration of the optical lens can be corrected, field curvature can be optimized, and the image quality of the lens can be further improved.

[0049] In summary, the optical system provided by this embodiment of the invention, by setting the optical lens to include seven lenses with optical power, ensures a suitable total length of the optical lens by reasonably setting the number of lenses, achieving a relatively miniaturized design while ensuring small imaging aberrations and high image quality. Furthermore, the optical power of the seven lenses is arranged in a negative-negative-positive-negative-positive-negative-positive pattern. This reasonable arrangement of the seven lenses' optical power allows for an increase in the aperture of the optical lens and an improvement in its imaging resolution. Moreover, by reasonably setting the ratio between the optical power of each lens and the optical power of the entire lens, the light propagation path can be further adjusted, the optical path optimized, off-axis aberrations corrected, spherical and chromatic aberration corrected, and field curvature optimized, further improving the image quality of the lens.

[0050] Based on the above embodiments, continue to refer to Figure 1 As shown, the optical lens also includes an aperture stop (not shown) and a filter 108; the aperture stop is disposed in the optical path between the third lens 103 and the fourth lens 104, or in the optical path between the fourth lens 104 and the fifth lens 105; the filter 108 is disposed in the optical path between the seventh lens 107 and the image plane.

[0051] Specifically, by setting an aperture stop, the propagation direction of the light beam can be adjusted, which helps to improve image quality. Furthermore, the aperture stop in this optical lens can be located in the optical path between the third lens 103 and the fourth lens 104, or in the optical path between the fourth lens 104 and the fifth lens 105. The purpose is to control higher-order aberrations of the lens at the front end, ensuring good image quality while improving image height and widening the target area at the rear end of the lens. Further, a filter 108 is disposed in the optical path between the seventh lens 107 and the image plane. The filter 108 can filter out interfering light, improving the imaging effect of the optical lens.

[0052] Furthermore, the optical lens provided in this embodiment may also include a protective glass and an imaging sensor. The protective glass can be disposed on the image-side of the filter, and the imaging sensor can be disposed on the image-side of the protective glass. The optical system is protected by the protective glass, and the image is acquired by the imaging sensor, enabling the optical system to perform its normal imaging function.

[0053] Based on the above embodiments, the optical aperture of the first lens 101 is D, and the image height corresponding to the maximum field of view of the optical lens is ImgH; wherein, 2.2≤D / ImgH≤2.5.

[0054] Specifically, by establishing the correspondence between the optical aperture of the first lens 101 and the image height corresponding to the maximum field of view, the feature of high pixel miniaturization can be achieved.

[0055] Based on the above embodiments, the aperture number of the optical lens is FNO, and the total optical length is TTL; wherein, 0.077≤FNO / TTL≤0.117. By rationally designing the correspondence between the aperture number and the total optical length, the feature of large aperture miniaturization can be achieved.

[0056] Based on the above embodiments, the first lens 101 includes a first object-side surface near the object plane and a first image-side surface near the image plane, wherein the first object-side surface is convex and the first image-side surface is concave; the second lens 102 includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface and the second image-side surface are concave; the third lens 103 includes a third object-side surface near the object plane and a third image-side surface near the image plane, wherein the third object-side surface and the third image-side surface are convex; and the fourth lens 104 includes a fourth object-side surface near the object plane. The fifth lens 105 includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane, both of which are concave and convex. The sixth lens 106 includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane, both of which are concave and convex. The seventh lens 107 includes a seventh object-side surface near the object plane and a seventh image-side surface near the image plane, both of which are concave and convex.

[0057] Specifically, the object-side surface of a lens can be understood as the surface of the lens closest to the object plane, and the image-side surface can be understood as the surface of the lens closest to the image plane. The first object-side surface is convex, and the first image-side surface is concave. That is, the object-side surface of the first lens 101 convexes towards the object plane near the optical axis, and the image-side surface is concave towards the image plane near the optical axis. In other words, the first lens 101 is a lens with a convex-concave structure. Specifically, the first lens 101 can be a meniscus negative lens that is convex in the front and concave in the back. This surface design can further smooth the object-side light rays into the imaging system while reducing the front aperture of the lens.

[0058] The second object-side surface is concave, and the second image-side surface is also concave. That is, the object-side surface of the second lens 102 is concave towards the object plane near the optical axis, and the image-side surface is concave towards the image plane near the optical axis. In other words, the second lens 102 is a double-concave lens. Furthermore, the object-side surface of the second lens 102 bends towards the image plane. Meeting this condition can change the relative position and size of the ghost image reflected from the object-side surface of the second lens 102 on the image plane, effectively reducing the relative energy value of the ghost image and achieving the requirement of weak ghosting.

[0059] The third object-side surface is convex, and the third image-side surface is convex. That is, the object-side surface of the third lens 103 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the third lens 103 is a lens with a biconvex structure.

[0060] The fourth object-side surface is concave, and the fourth image-side surface is convex. That is, the object-side surface of the fourth lens 104 is concave towards the object surface at the position near the optical axis, and the image-side surface is convex towards the image surface at the position near the optical axis. In other words, the fourth lens 104 is a lens with a concave-convex structure.

[0061] The fifth object-side surface is convex, and the fifth image-side surface is also convex. That is, the object-side surface of the fifth lens 105 convexes towards the object surface near the optical axis, and the image-side surface convexes towards the image surface near the optical axis. In other words, the fifth lens 105 is a lens with a biconvex structure.

[0062] The sixth object-side surface is concave, and the sixth image-side surface is convex. That is, the object-side surface of the sixth lens 106 is concave towards the object surface near the optical axis, and the image-side surface is convex towards the image surface near the optical axis. In other words, the sixth lens 106 is a lens with a concave-convex structure.

[0063] The seventh object-side surface is concave, and the seventh image-side surface is convex. That is, the object-side surface of the seventh lens 107 is concave towards the object surface at the position near the optical axis, and the image-side surface is convex towards the image surface at the position near the optical axis. In other words, the seventh lens 107 is a lens with a concave-convex structure.

[0064] By designing the surface shape of each lens and combining the optical power of each lens, the imaging effect of the optical lens and the overall size of the optical lens can be further adjusted.

[0065] Based on the above embodiments, the refractive index of the first lens 101 is n1, the refractive index of the second lens 102 is n2, the refractive index of the third lens 103 is n3, the refractive index of the fourth lens 104 is n4, the refractive index of the fifth lens 105 is n5, the refractive index of the sixth lens 106 is n6, and the refractive index of the seventh lens 107 is n7; wherein, 1.81 <n1<2.01,1.41<n2<1.61,1.85<n3<2.05,1.54<n4<1.74,0.83≤n5 / n6≤1.06,1.44<n7<1.64。

[0066] The first lens 101 employs a high-refractive-index negative power lens, which is beneficial for light collection and meets the requirements of a large field of view. The third lens 103 employs a high-refractive-index positive power lens, which helps reduce radial dimensions. Furthermore, the design of the second lens 102 (low-refractive-index + biconcave lens) combined with the design of the third lens 103 (high-refractive-index + biconvex lens) allows light from different positions to be focused onto the same imaging plane, effectively correcting spherical aberration. Further, the fifth lens 105 and the sixth lens 106 can be cemented together, and the refractive index ratio of the fifth lens 105 and the sixth lens 106 is within the range of 0.83 ≤ n5 / n6 ≤ 1.06, meaning that the refractive indices of the fifth lens 105 and the sixth lens 106 are comparable. This allows light to enter the sixth lens 106 relatively smoothly from the fifth lens 105, without significant light reversal between the two lenses, reducing interface aberrations and improving image sharpness. By properly setting the refractive index of each lens, the optical path can be further optimized, finding the optimal solution between aberration correction, resolution, size and weight, cost and mass production, and scene adaptation.

[0067] Based on the above embodiment, the fifth lens 105 and the sixth lens 106 are cemented together.

[0068] Specifically, the cemented joint between lenses can be understood as the image-side surface of the preceding lens being bonded to the object-side surface of the following lens. Specifically, the cemented joint between the fifth lens 105 and the sixth lens 106 can be understood as the image-side surface of the fifth lens 105 being bonded to the object-side surface of the sixth lens 106, that is, the image-side surface of the fifth lens 105 being bonded to the object-side surface of the sixth lens 106. By cementing the fifth lens 105 and the sixth lens 106, the air gap between them can be reduced, which helps to reduce the overall optical length of the lens. It can also reduce tolerance sensitivity issues such as tilt / eccentricity during lens assembly, simplifying the assembly process in lens manufacturing and improving equipment efficiency. At the same time, the fifth lens 105 and the sixth lens 106 can also reduce light loss caused by inter-lens reflections, improve illumination, and significantly suppress ghosting and flare, especially in high-contrast environments such as backlighting, resulting in cleaner, higher-contrast images. Furthermore, cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in optical lenses can improve image quality and reduce light energy reflection loss, thereby improving image quality and enhancing the sharpness of the lens image. Furthermore, the cementing arrangement between the fifth lens 105 and the sixth lens 106 can be achieved through a spacer or by adhesive bonding; this embodiment of the invention does not limit the specific bonding method.

[0069] Furthermore, the Abbe number of the fifth lens 105 is VD5, and the Abbe number of the sixth lens 106 is VD6; where VD5 - VD6 > 30. By setting the fifth lens 105 as a high Abbe number lens with positive optical power and the sixth lens 106 as a low Abbe number lens with negative optical power, and by cementing lenses with different dispersion characteristics together, aberrations caused by differences in the refractive index of different colors of light can be effectively corrected, thereby improving the color reproduction and sharpness of the image.

[0070] Based on the above embodiments, the first lens 101 and the third lens 103 are both glass spherical lenses, and the second lens 102, the fourth lens 104, the fifth lens 105, the sixth lens 106 and the seventh lens 107 are all plastic aspherical lenses.

[0071] Specifically, spherical lenses are characterized by a constant curvature from the center to the periphery, ensuring a simple lens setup. Furthermore, due to the low coefficient of thermal expansion and good stability of glass lenses, both the first lens 101 and the third lens 103 are glass spherical lenses. The thermal properties of glass spherical lenses are more stable, ensuring good resolving power over a wide temperature range when handling higher optical powers. Moreover, the range of glass materials available is wider, and the choice of refractive index and Abbe number is relatively flexible, allowing for better control of higher aberrations and chromatic aberration, meeting the needs of use under complex conditions.

[0072] Aspherical lenses are characterized by a continuous change in curvature from the center to the periphery, unlike spherical lenses which have a constant curvature from the center to the periphery. Aspherical lenses possess superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. The second lens 102, fourth lens 104, fifth lens 105, sixth lens 106, and seventh lens 107 are all plastic aspherical lenses. The use of plastic aspherical lenses simplifies the manufacturing process and reduces the cost of the aspherical lens, thus lowering the overall cost of the optical system.

[0073] Therefore, the optical lens provided in this embodiment of the present invention can adopt a combination of glass spherical lenses and plastic aspherical lenses, which can effectively control the cost of the optical lens while ensuring its optical performance; at the same time, the materials of each lens have a mutual compensating effect, which can ensure normal use in high and low temperature environments.

[0074] Furthermore, in this embodiment of the invention, the aspherical lens of the optical system satisfies the following formula:

[0075]

[0076] Where z is the axial sagitta in the Z direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; k is the coefficient of the fitted cone; and AH are the coefficients of the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspherical polynomial.

[0077] Based on the same concept, this utility model embodiment also provides an imaging device, including the optical lens described in the above embodiment, which has the corresponding technical effects, and will not be repeated here.

[0078] Next, the parameters of each lens in the optical lens will be explained using specific embodiments.

[0079] Example 1

[0080] Table 1. Optical design values ​​for the optical lens in Example 1

[0081]

[0082] Table 2 Design values ​​of optical physical parameters for an optical lens

[0083]

[0084] The surface numbers in Table 2 are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; "IMA" represents the image plane of the lens; the radius represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "Infinity" indicates that the surface is flat and has an infinite radius of curvature; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; and a blank space indicates that the current position is air with a refractive index of 1.

[0085] Table 3 Design values ​​of aspherical conic coefficient in an optical lens

[0086]

[0087] "3.52E+02" means 3.52 × 10 2 All other coefficients are represented in this way.

[0088] Furthermore, Figure 4 This is a schematic diagram of the field curvature and distortion of the optical lens provided in Embodiment 1 of this utility model. Figure 4 It has two coordinate systems. In the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the angle, in °. Figure 4As can be seen from the left coordinate system, the optical lens provided in this embodiment effectively controls field curvature, meaning that during imaging, the difference in image quality between the center and the periphery is small, resulting in good consistency. In the right coordinate system, the horizontal axis represents the magnitude of distortion, in %; the vertical axis represents angle, in °; and... Figure 4 As can be seen from the coordinate system on the right, the maximum distortion is 97.2633% when the maximum field of view is 89°.

[0089] Figure 5 This is a schematic diagram of the transverse aberration of the optical lens provided in Embodiment 1 of this utility model. The vertical axis in the figure is a dimensionless quantity, representing the normalized entrance pupil radius, and the horizontal axis represents the distance from the image plane to the intersection of the ray and the optical axis. The aberration of this optical lens at different wavelengths (436nm, 486nm, 546nm, 587nm, 656nm) is within ±0.03mm, indicating that the transverse aberration of this optical lens is well corrected.

[0090] Figure 6 This is a schematic diagram of the light field fan of the optical lens provided in Embodiment 1 of this utility model. The light field fan diagram is one of the most commonly used evaluation methods in modern optical design. Figure 6 As shown, the horizontal axis of a single ray fan plot represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, at which point all rays in the field of view focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum diffusion range of the beam on the ideal image plane. Ray fan plots can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 6 As shown, the ray fan plots of the optical system at various wavelengths (436nm, 486nm, 546nm, 587nm, 656nm) in each field of view closely approximate the horizontal axis, indicating that the transverse aberrations at each wavelength (436nm, 486nm, 546nm, 587nm, 656nm) are well corrected. Furthermore, the curves for each color corresponding to each wavelength (436nm, 486nm, 546nm, 587nm, 656nm) do not exhibit significant dispersion, indicating that the optical system of this lens also provides good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire spectral range.

[0091] In summary, the optical lens provided in Embodiment 1 of this utility model constructs a 2G5P optical system. By optimizing the optical power and relative positions of each lens element, a balanced design of compact structure, large aperture, and high resolution is achieved while meeting imaging quality requirements. This results in a high-resolution, miniaturized, and low-cost glass-plastic hybrid panoramic high-definition optical lens with high reliability, capable of operation within a temperature range of -40℃ to 85℃.

[0092] Example 2

[0093] Table 4. Optical design values ​​for the optical lens in Example 2

[0094]

[0095] Table 5 Design values ​​of optical physical parameters for an optical lens

[0096]

[0097] The surface numbers in Table 5 are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; "IMA" represents the image plane of the lens; the radius represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "Infinity" indicates that the surface is flat and has an infinite radius of curvature; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; and a blank space indicates that the current position is air and the refractive index is 1.

[0098] Table 6. Design values ​​of aspherical conic coefficient in an optical lens

[0099]

[0100] "5.81E+02" means 5.81 × 10 2 All other coefficients are represented in this way.

[0101] Furthermore, Figure 7 This is a schematic diagram of the field curvature and distortion of the optical lens provided in Embodiment 2 of this utility model. Figure 7 It has two coordinate systems. In the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the angle, in °. Figure 7 As can be seen from the left coordinate system, the optical lens provided in this embodiment effectively controls field curvature, meaning that during imaging, the difference in image quality between the center and the periphery is small, resulting in good consistency. In the right coordinate system, the horizontal axis represents the magnitude of distortion, in %; the vertical axis represents angle, in °; and... Figure 7 As can be seen from the coordinate system on the right, the maximum distortion is 97.2544% when the maximum field of view is 89°.

[0102] Figure 8This is a schematic diagram of the transverse aberration of the optical lens provided in Embodiment 2 of this utility model. The vertical axis in the figure is a dimensionless quantity, representing the normalized entrance pupil radius, and the horizontal axis represents the distance from the image plane to the intersection of the ray and the optical axis. The aberration of this optical lens at different wavelengths (436nm, 486nm, 546nm, 587nm, 656nm) is within ±0.02mm, indicating that the transverse aberration of this optical lens is well corrected.

[0103] Figure 9 This is a schematic diagram of the light field fan of the optical lens provided in Embodiment 2 of this utility model. The light field fan diagram is one of the most commonly used evaluation methods in modern optical design. Figure 9 As shown, the horizontal axis of a single ray fan plot represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, at which point all rays in the field of view focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum diffusion range of the beam on the ideal image plane. Ray fan plots can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 9 As shown, the ray fan plots of the optical system at various wavelengths (436nm, 486nm, 546nm, 587nm, 656nm) in each field of view closely approximate the horizontal axis, indicating that the transverse aberrations at each wavelength (436nm, 486nm, 546nm, 587nm, 656nm) are well corrected. Furthermore, the curves for each color corresponding to each wavelength (436nm, 486nm, 546nm, 587nm, 656nm) do not exhibit significant dispersion, indicating that the optical system of this lens also provides good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire spectral range.

[0104] In summary, the optical lens provided in Embodiment 2 of this utility model constructs an optical system with a 2G5P structure. By optimizing the optical power and relative positions of each lens element, a balanced design of compact structure, large aperture, and high resolution is achieved while meeting imaging quality requirements. This results in a high-resolution, miniaturized, and low-cost glass-plastic hybrid panoramic high-definition optical lens with high reliability, capable of operation within a temperature range of -40℃ to 85℃.

[0105] Example 3

[0106] Table 7. Optical design values ​​for the optical lens in Example 3

[0107]

[0108] Table 8 Design values ​​of optical physical parameters for an optical lens

[0109]

[0110] The surface numbers in Table 8 are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; "IMA" represents the image plane of the lens; the radius represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "Infinity" indicates that the surface is flat and has an infinite radius of curvature; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; and a blank space indicates that the current position is air with a refractive index of 1.

[0111] Table 9 Design values ​​of aspherical conic coefficient in an optical lens

[0112]

[0113] "3.00E+02" means 3.00 × 10 2 All other coefficients are represented in this way.

[0114] Furthermore, Figure 10 This is a schematic diagram of the field curvature and distortion of the optical lens provided in Embodiment 3 of this utility model. Figure 10 It has two coordinate systems. In the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the angle, in °. Figure 10 As can be seen from the left coordinate system, the optical lens provided in this embodiment effectively controls field curvature, meaning that during imaging, the difference in image quality between the center and the periphery is small, resulting in good consistency. In the right coordinate system, the horizontal axis represents the magnitude of distortion, in %; the vertical axis represents angle, in °; and... Figure 10 As can be seen from the coordinate system on the right, the maximum distortion is 97.2589% when the maximum field of view is 89°.

[0115] Figure 11 This is a schematic diagram of the transverse aberration of the optical lens provided in Embodiment 3 of this utility model. The vertical axis in the figure is a dimensionless quantity, representing the normalized entrance pupil radius, and the horizontal axis represents the distance from the image plane to the intersection of the ray and the optical axis. The aberration of this optical lens at different wavelengths (436nm, 486nm, 546nm, 587nm, 656nm) is within ±0.03mm, indicating that the transverse aberration of this optical lens is well corrected.

[0116] Figure 12 This is a schematic diagram of the light fan of the optical lens provided in Embodiment 3 of this utility model. The light fan diagram is one of the most commonly used evaluation methods in modern optical design. Figure 12As shown, the horizontal axis of a single ray fan plot represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should perfectly coincide with the horizontal axis, at which point all rays in the field of view focus at the same point on the image plane. The vertical axis in a single image can also represent the maximum diffusion range of the beam on the ideal image plane. Ray fan plots can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 12 As shown, the ray fan plots of the optical system at various wavelengths (436nm, 486nm, 546nm, 587nm, 656nm) in each field of view closely approximate the horizontal axis, indicating that the transverse aberrations at each wavelength (436nm, 486nm, 546nm, 587nm, 656nm) are well corrected. Furthermore, the curves for each color corresponding to each wavelength (436nm, 486nm, 546nm, 587nm, 656nm) do not exhibit significant dispersion, indicating that the optical system of this lens also provides good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire spectral range.

[0117] In summary, the optical lens provided in Embodiment 3 of this utility model constructs a 2G5P optical system. By optimizing the optical power and relative positions of each lens element, a balanced design of compact structure, large aperture, and high resolution is achieved while meeting imaging quality requirements. This results in a high-resolution, miniaturized, and low-cost glass-plastic hybrid panoramic high-definition optical lens with high reliability, capable of operation between -40℃ and 85℃.

[0118] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An optical lens, characterized in that, It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object plane to the image plane; The first lens, the second lens, the fourth lens, and the sixth lens are all negative power lenses, while the third lens, the fifth lens, and the seventh lens are all positive power lenses. The optical power of the first lens is φ1, the optical power of the second lens is φ2, the optical power of the third lens is φ3, the optical power of the fourth lens is φ4, the optical power of the fifth lens is φ5, the optical power of the sixth lens is φ6, the optical power of the seventh lens is φ7, and the optical power of the optical lens is φ. Among them, -0.3≤φ1 / φ≤-0.2, -0.5≤φ2 / φ≤-0.35, 0.3≤φ3 / φ≤0.5, -0.5≤φ4 / φ≤-0.4, 0.75≤φ5 / φ≤0.85, -0.5≤φ6 / φ≤-0.4, and 0.2≤φ7 / φ≤0.

3.

2. The optical lens according to claim 1, characterized in that, The optical aperture of the first lens is D, and the image height corresponding to the maximum field of view of the optical lens is ImgH; Among them, 2.2≤D / ImgH≤2.

5.

3. The optical lens according to claim 1, characterized in that, The optical lens has an aperture of FNO and a total optical length of TTL. Wherein, 0.077≤FNO / TTL≤0.

117.

4. The optical lens according to claim 1, characterized in that, The first lens includes a first object-side surface near the object plane and a first image-side surface near the image plane. The first object-side surface is convex, and the first image-side surface is concave. The second lens includes a second object-side surface near the object plane and a second image-side surface near the image plane, wherein the second object-side surface and the second image-side surface are concave. The third lens includes a third object-side surface near the object plane and a third image-side surface near the image plane. The third object-side surface is convex, and the third image-side surface is convex. The fourth lens includes a fourth object-side surface near the object plane and a fourth image-side surface near the image plane. The fourth object-side surface is concave, and the fourth image-side surface is convex. The fifth lens includes a fifth object-side surface near the object plane and a fifth image-side surface near the image plane. The fifth object-side surface is convex, and the fifth image-side surface is convex. The sixth lens includes a sixth object-side surface near the object plane and a sixth image-side surface near the image plane. The sixth object-side surface is concave, and the sixth image-side surface is convex. The seventh lens includes a seventh object-side surface near the object plane and a seventh image-side surface near the image plane. The seventh object-side surface is concave, and the seventh image-side surface is convex.

5. The optical lens according to claim 1, characterized in that, The first lens has a refractive index of n1, the second lens has a refractive index of n2, the third lens has a refractive index of n3, the fourth lens has a refractive index of n4, the fifth lens has a refractive index of n5, the sixth lens has a refractive index of n6, and the seventh lens has a refractive index of n7. Among them, 1.81 <n1<2.01,1.41<n2<1.61,1.85<n3<2.05,1.54<n4<1.74,0.83≤n5 / n6≤1.06,1.44<n7<1.64。 6. The optical lens according to claim 1, characterized in that, The fifth lens and the sixth lens are cemented together.

7. The optical lens according to claim 6, characterized in that, The Abbe number of the fifth lens is VD5, and the Abbe number of the sixth lens is VD6; Among them, VD5-VD6 > 30.

8. The optical lens according to claim 1, characterized in that, The first lens and the third lens are both glass spherical lenses, while the second lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all plastic aspherical lenses.

9. The optical lens according to claim 1, characterized in that, The optical lens also includes an aperture stop and a filter; The aperture stop is disposed in the optical path between the third lens and the fourth lens, or in the optical path between the fourth lens and the fifth lens; The filter is disposed in the optical path between the seventh lens and the image plane.

10. An imaging device, characterized in that, Includes the optical lens as described in any one of claims 1-9.

Images