Optical lens

Abstract

The application provides an optical lens, which comprises seven lenses in sequence along an optical axis from an object side to an imaging surface, and the seven lenses comprise: a first lens with negative optical power, wherein the object side surface is a concave surface and the image side surface is a concave surface; a second lens with negative optical power, wherein the object side surface is a concave surface and the image side surface is a convex surface; a third lens with positive optical power, wherein the object side surface is a convex surface and the image side surface is a concave surface; a fourth lens with positive optical power, wherein the object side surface is a convex surface and the image side surface is a convex surface; a fifth lens with positive optical power, wherein the object side surface is a convex surface and the image side surface is a convex surface; a sixth lens with negative optical power, wherein the object side surface is a concave surface; and a seventh lens with positive optical power, wherein the object side surface is a convex surface near the optical axis and the image side surface is a concave surface near the optical axis. The optical lens provided by the application has one or more advantages of miniaturization, large aperture, large image height, large field of view, high pixel, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

Description

Technical Field

[0001] This invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Technology

[0002] Background Technology Description: With the rapid development of the automotive industry, vehicle safety and intelligence levels are receiving increasing attention. As one of the key sensors in intelligent driving systems, in-vehicle cameras are becoming increasingly important. Traditional cars primarily rely on the driver's visual observation to obtain road condition information. However, human drivers have limited vision and are easily affected by fatigue, distraction, and other factors, leading to traffic accidents. The emergence of in-vehicle cameras provides vehicles with an additional means of visual perception, capable of capturing real-time image information of the vehicle's surrounding environment, assisting drivers in making more accurate judgments. From a technological development perspective, early in-vehicle cameras were mainly used for simple reversing image functions, with low resolution, poor image quality, and relatively limited functionality. With advancements in image sensor technology, the pixel count of in-vehicle cameras has continuously increased, from the initial hundreds of thousands of pixels to millions or even tens of millions of pixels today, providing clearer and more detailed images. Simultaneously, the field of view of cameras has gradually increased, expanding from a single rear-view camera to various types such as front-view, side-view, and surround-view cameras, comprehensively covering the vehicle's surrounding environment and providing more comprehensive visual data support for the vehicle's autonomous driving assistance systems.

[0003] Existing automotive lenses not only require optical lenses to have a slim and compact shape and high pixel count and high resolution, but also require optical lenses to be able to produce clear images under low light conditions. Therefore, it is necessary to develop an optical lens with good imaging performance. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide an optical lens with the advantage of excellent image quality.

[0005] The technical solution adopted in this invention is as follows:

[0006] An optical lens comprises seven lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

[0007] The first lens with negative optical power has a concave object side and a concave image side.

[0008] A second lens with negative optical power has a concave object side and a convex image side.

[0009] A third lens with positive optical power has a convex object-side surface and a concave image-side surface.

[0010] The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0011] The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0012] The sixth lens has negative optical power and its object side is concave.

[0013] The seventh lens with positive optical power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis.

[0014] Wherein, the true image height IH corresponding to the maximum field of view of the optical lens, the effective focal length f of the optical lens and the maximum field of view FOV of the optical lens satisfy: 0.5 < (IH / 2) / (f×tan(FOV / 2)) < 0.55.

[0015] Further preferably, the total optical length (TTL) of the optical lens and the aperture value (Fno) of the optical lens satisfy: 15mm <TTL / Fno<17mm。

[0016] Further preferably, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 <IH / f<1.9。

[0017] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.2 <f3 / f<5.5。

[0018] More preferably, the object-side radius of curvature R3 of the second lens and the image-side radius of curvature R4 of the second lens satisfy: -10<(R3+R4) / (R3-R4)<-7.5.

[0019] Further preferably, the focal length f2 of the second lens, the object-side radius of curvature R3 of the second lens, and the image-side radius of curvature R4 of the second lens satisfy: 11 <f2 / (R3+R4)<19。

[0020] Further preferably, the object-side half-aperture CSD11 of the first lens and the object-side half-aperture sagitta SAGX11 of the first lens satisfy: -75 <CSD11 / SAGX11<-50。

[0021] Further preferably, the half-aperture CSD11 of the object-side end of the first lens and the true image height IH corresponding to the maximum field of view of the optical lens satisfy: 0.5 <CSD11 / IH<0.6。

[0022] More preferably, the Abbe number Vd1 of the first lens and the Abbe number Vd2 of the second lens satisfy: 75 <Vd1+Vd2<90。

[0023] Further preferably, the image-side half-aperture CSD32 of the third lens and the object-side half-aperture CSD41 of the fourth lens satisfy: 1 <CSD32 / CSD41<1.2。

[0024] The optical lens provided by this invention uses seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as miniaturization, large aperture, large image height, large field of view, high pixel count, and high imaging quality. Attached Figure Description

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0027] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 3 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 4 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 5 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0031] Figure 6 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0032] Figure 7 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 8 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 9 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0036] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 12 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 13 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 14 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0040] Figure 15 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0041] Illustration: In the figure, the blue line segment represents a wavelength of 0.436 μm; the green line segment represents a wavelength of 0.486 μm; the red line segment represents a wavelength of 0.546 μm; the yellow line segment represents a wavelength of 0.588 μm; and the purple line segment represents a wavelength of 0.656 μm.

[0042] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0043] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0044] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0045] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0046] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0047] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0048] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] The optical lens provided in this embodiment of the invention has a total of seven lenses, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0051] In some embodiments, the first lens may have negative optical power, with both its object-side and image-side surfaces being concave. The second lens may have negative optical power, with both its object-side and image-side surfaces being convex. The third lens may have positive optical power, with both its object-side and image-side surfaces being convex. The fourth lens may have positive optical power, with both its object-side and image-side surfaces being convex. The fifth lens may have positive optical power, with both its object-side and image-side surfaces being convex. The sixth lens may have negative optical power, with both its object-side and image-side surfaces being concave or convex. The seventh lens may have positive optical power, with its object-side surface being convex near the optical axis and its image-side surface being concave near the optical axis.

[0052] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.5 < (H / 2) / (f × tan(FOV / 2)) < 0.55. Satisfying the above conditional formula enables the optical lens to have a relatively large field angle while also achieving the characteristic of a large image height, which is beneficial for the optical lens to match a larger-sized photosensitive chip, avoid vignetting, and improve the relative illuminance of the optical lens; at the same time, it can effectively increase the proportion of the edge field of the optical lens in the entire image plane, control the edge distortion of the optical lens, and improve the imaging quality of the optical lens.

[0053] In some embodiments, the overall optical length TTL of the optical lens and the F-number Fno of the optical lens satisfy: 15 mm < TTL / Fno < 17 mm. Satisfying the above conditional formula, by controlling the relationship between the overall length and the F-number of the optical lens, it is ensured that the optical lens can meet the requirements of large aperture and miniaturized design, enabling the optical lens to obtain sufficient light transmittance even in a dim environment and meeting the need for high-quality and high-definition shooting.

[0054] In some embodiments, the true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 1.9. Satisfying the above conditional formula can achieve the characteristic of a large image plane of the lens, match a larger-sized chip, and achieve high-pixel imaging of the lens.

[0055] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.2 < f3 / f < 5.5. Satisfying the above conditional formula, by setting the third lens with a positive optical power and defining the ratio of the focal length of the third lens to the effective focal length of the optical lens, it is beneficial to adjust the light path from the first lens and the second lens, enabling the optical lens to have certain characteristics of a large field angle, low sensitivity, and miniaturization.

[0056] In some embodiments, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: -10 < (R3 + R4) / (R3 - R4) < -7.5. Meeting the above conditions enables the second lens to effectively correct the off-axis field aberration of the optical lens, suppress the generation of astigmatism, and reduce the angle at which the chief ray of the peripheral view angle enters the imaging plane of the optical lens, thereby improving the imaging quality of the optical lens.

[0057] In some embodiments, the focal length f2 of the second lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 11 < f2 / (R3 + R4) < 19. By satisfying the above conditional formula, the surface profiles of the object side surface and the image side surface of the second lens can be constrained, which is beneficial to reducing the bending degree of light at the image side surface of the second lens, reducing the astigmatism of the optical lens, so as to balance the astigmatism problem brought by the large field angle of the optical lens, and ensuring that the astigmatism of the optical lens is not too large while having a large field of view, thereby ensuring that the optical lens has excellent imaging quality.

[0058] In some embodiments, the clear aperture semi-diameter CSD11 of the object side end of the first lens and the sagitta SAGX11 of the clear aperture of the object side end of the first lens satisfy: -75 < CSD11 / SAGX11 < -50. By satisfying the above conditions, it is possible to avoid the surface profile of the object side surface of the first lens from being too curved, which is beneficial for large-angle light to enter the lens, and thus beneficial for expanding the field angle of the lens and improving the imaging quality of the optical lens. At the same time, it is also beneficial for reducing the processing difficulty of the first lens and avoiding the uneven coating caused by the too-curved surface profile of the object side surface of the first lens; in addition, it can also avoid the surface profile of the object side surface of the first lens from being too flat, which is beneficial for reducing the risk of ghost images.

[0059] In some embodiments, the clear aperture semi-diameter CSD11 of the object side end of the first lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.5 < CSD11 / IH < 0.6. By satisfying the above conditions, by reasonably controlling the clear aperture semi-diameter of the object side surface of the first lens, the optical lens can have a certain large field angle and also have the imaging quality of a large image plane and high pixels.

[0060] In some embodiments, the Abbe number Vd1 of the first lens and the Abbe number Vd2 of the second lens satisfy: 75 < Vd1 + Vd2 < 90. By satisfying the above conditions, the chromatic aberration correction effect of the first lens and the second lens is improved; at the same time, it can also make the chromatic aberration correction effect of the first two lenses distributed at the front end of the optical lens, which is beneficial for improving the chromatic dispersion correction ability of the optical lens, and thus improving the imaging quality of the optical lens

[0061] In some embodiments, the clear aperture semi-diameter CSD32 of the image side end of the third lens and the clear aperture semi-diameter CSD41 of the object side end of the fourth lens satisfy: 1 < CSD32 / CSD41 < 1.2. By satisfying the above conditions, by reasonably distributing the maximum effective apertures of the third lens and the fourth lens, it is beneficial for reducing the step difference between the third lens and the fourth lens, so that light can enter the fourth lens more smoothly from the third lens.

[0062] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value Fno of the optical lens satisfy: 66° < FOV / Fno < 71°. Meeting the above conditional formula defines that the optical lens has an appropriate field of view and aperture value, can collect light at large angles, and obtain good imaging quality.

[0063] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.4 < f1 / f < -1.1. Meeting the above conditional formula, setting the first lens of the optical lens as a negative focal power lens can capture the light rays entering the optical lens at large angles, expand the field of view range of the optical lens; at the same time, it is also beneficial to reduce the sensitivity of the optical lens and achieve the miniaturized design of the optical lens.

[0064] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -1.5 < f6 / f < -1. Meeting the above conditions can make the sixth lens have an appropriate negative focal power, can reduce the deflection angle of the light rays in the sixth lens, reduce the sensitivity of the sixth lens, and can also reduce the aberrations such as astigmatism and distortion generated by the lens group in front of the sixth lens, thereby being beneficial to improving the imaging quality of the optical lens.

[0065] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the focal length f1 of the first lens satisfy: 24 < R1 / f1 < 29. Meeting the above conditional formula, by reasonably configuring the ratio of the curvature radius of the object side surface of the first lens to the effective focal length of the first lens, the marginal rays can be better converged into the optical lens, effectively expanding the field of view of the optical lens.

[0066] In some embodiments, the curvature radius R14 of the image side surface of the seventh lens and the effective focal length f of the optical lens satisfy: 3.5 < R14 / f < 6. Meeting the above conditions can correct the spherical aberration of the lens and improve the imaging quality; and the surface shape of the image side surface of the seventh lens changes smoothly from the optical axis to the edge, converging the angles of the marginal field of view incident on the imaging surface and the marginal field of view aberration, improving the imaging quality.

[0067] In some embodiments, the optical lens satisfies the following conditional formula: 26mm < TTL ≤ 30mm; 1.7 ≤ Fno ≤ 1.8; 9.2mm < IH ≤ 9.7mm; 5mm < f < 5.2mm; FOV = 120°. In the above conditional formula, TTL represents the total optical length of the optical lens, Fno represents the aperture value of the optical lens, IH represents the true image height corresponding to the maximum field of view of the optical lens, f represents the effective focal length of the optical lens, and FOV represents the maximum field of view of the optical lens. Meeting the above conditional formula, the optical lens has at least one or more advantages such as miniaturization, large aperture, large image height, long focal length, and large field of view angle.

[0068] In some embodiments, the lens material in the optical lens provided by the present invention can be glass or plastic. When the lens is made of plastic, production costs can be effectively reduced. Conversely, when the lens is made of glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical system. The optical lens provided by the present invention can employ an all-glass lens structure, which can reduce dispersion, effectively correct chromatic aberration of the optical lens, and improve image quality.

[0069] In some embodiments, the first, second, third, fourth, fifth, sixth, and seventh lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the first, second, fourth, fifth, and sixth lenses of this invention are spherical lenses; the third and seventh lenses can be aspherical lenses.

[0070] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations:

[0071]

[0072] Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, and F are the fourth, sixth, eighth, tenth, and twelfth order surface coefficients, respectively.

[0073] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0074] Example 1

[0075] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and a filter G1.

[0076] Among them, the first lens L1 has negative optical power, its object side S1 is concave, and its image side S2 is concave.

[0077] The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is convex.

[0078] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is concave.

[0079] The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side S8 is convex.

[0080] The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side is convex.

[0081] The sixth lens L6 has negative optical power, its object side is concave, and its image side S11 is convex.

[0082] The fifth lens L5 and the sixth lens L6 form a cemented lens group with positive optical power, that is, the cemented surface of the image side of the fifth lens L5 and the object side of the sixth lens is S10.

[0083] The seventh lens L7 has positive optical power, its object side S12 is convex near the optical axis, and its image side S13 is concave near the optical axis.

[0084] The object-side surface S14 and the image-side surface S15 of filter G1 are both planar.

[0085] The imaging plane S16 is a plane.

[0086] The third lens L3 and the seventh lens L7 are glass aspherical lenses; the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are glass spherical lenses.

[0087] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0088] Table 1-1

[0089]

[0090]

[0091] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0092] Table 1-2

[0093] Face number K B C D E F S5 1.1857E+00 -1.7902E-04 -4.3361E-06 6.4713E-08 -4.5315E-09 3.4554E-11 S6 2.8022E+00 2.5008E-04 -8.4781E-06 1.6564E-06 -1.0568E-07 3.0812E-09 S12 1.2691E+01 -2.6379E-03 -3.7821E-05 -1.6810E-07 -1.8682E-07 9.8126E-09 S13 2.7950E+00 -2.3419E-03 -2.2833E-05 5.7584E-07 4.8154E-09 3.3727E-10

[0094] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown in the graphs, the blue line segment represents a wavelength of 0.436 μm; the green line segment represents a wavelength of 0.486 μm; the red line segment represents a wavelength of 0.546 μm; the yellow line segment represents a wavelength of 0.588 μm; and the purple line segment represents a wavelength of 0.656 μm.

[0095] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, representing the field curvature of the optical lens in the wavelength range of 0.436 μm to 0.656 μm. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). The solid line represents the field curvature in the meridional image plane, and the dashed line represents the field curvature in the sagittal image plane. As can be seen from the figure, the field curvature in both the meridional and sagittal image planes is controlled within ±0.03 mm, indicating that the optical lens 100 can effectively correct the field curvature.

[0096] Figure 3 The F-Tan (Theta) distortion curve of Example 1 is shown, representing the distortion of the optical lens at a wavelength of 0.656 μm. Specifically, it represents the F-Tan (Theta) distortion at different image heights on the imaging plane. The horizontal axis represents the F-Tan (Theta) distortion value (unit: %), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the F-Tan (Theta) distortion of the optical lens is controlled within -50% to 0, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image.

[0097] Figure 4 The diagram shows the axial aberration curve of the optical lens 100 in this embodiment, representing the axial aberration of the optical lens in the wavelength range of 0.436 μm to 0.656 μm. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the axial aberration offset is controlled within ±0.02 mm, indicating that the optical lens 100 can effectively correct axial aberration.

[0098] Figure 5The diagram shows the transverse chromatic aberration curve of the optical lens 100 in this embodiment. It represents the chromatic aberration at different image heights on the imaging plane within the wavelength range of 0.436 μm to 0.656 μm. The horizontal axis represents the transverse chromatic aberration value for each wavelength (unit: μm), and the vertical axis represents the half-field angle (unit: °). As can be seen from the diagram, the transverse chromatic aberration for the longest and shortest wavelengths is controlled within ±3 μm, indicating that the optical lens 100 can effectively correct chromatic aberration.

[0099] Example 2

[0100] Please see Figure 6 The figure shown is a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0101] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0102] Table 2-1

[0103]

[0104] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0105] Table 2-2

[0106] Face number K B C D E F S5 1.4520E+00 -8.3205E-05 -2.2833E-06 5.0568E-08 -4.5403E-09 1.9914E-10 S6 4.0050E+00 2.7806E-04 -8.9820E-06 1.6097E-06 -8.9229E-08 2.4988E-09 S12 -3.8472E+01 -3.0829E-03 -3.0359E-05 -1.6043E-06 -3.6074E-07 2.3706E-08 S13 2.2899E+01 -2.8478E-03 -1.5073E-05 4.0003E-07 6.3527E-09 6.3951E-10

[0107] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown.

[0108] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.03mm, indicating that the optical lens 200 can effectively correct the field curvature.

[0109] from Figure 8 As can be seen, the F-Tan (Theta) distortion of the optical lens 200 is controlled within -50% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0110] from Figure 9 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens 200 can effectively correct axial aberration.

[0111] from Figure 10 As can be seen, the chromatic aberration of the longest and shortest wavelengths is controlled within ±5μm, indicating that the optical lens 200 can correct chromatic aberration well.

[0112] Example 3

[0113] Please see Figure 11 The figure shown is a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that: the fifth lens L5 and the sixth lens L6 form a cemented lens group with negative optical power; the image side S11 of the sixth lens L6 is concave; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0114] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0115] Table 3-1

[0116]

[0117]

[0118] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0119] Table 3-2

[0120] Face number K B C D E F S5 1.3189E+00 -1.9332E-04 -7.5506E-06 3.0505E-07 -2.1551E-08 8.5566E-10 S6 -1.6495E+00 1.3571E-04 -9.7595E-06 1.0942E-06 -5.8277E-08 2.0411E-09 S12 -7.9858E+01 -1.2223E-03 -4.1684E-05 -2.9736E-06 2.9113E-07 -3.9407E-09 S13 9.4557E+00 -1.7316E-03 -6.0349E-06 -8.1905E-07 7.6637E-08 -7.3058E-10

[0121] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown.

[0122] from Figure 12 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.04mm, indicating that the optical lens 300 can effectively correct the field curvature.

[0123] from Figure 13 As can be seen, the F-Tan (Theta) distortion of the optical lens 300 is controlled within -50% to 0, and the image compression in the edge angle area is relatively smooth, which effectively improves the clarity of the unfolded image.

[0124] from Figure 14 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens 300 can effectively correct axial aberration.

[0125] from Figure 15 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±4μm, indicating that the optical lens 300 can correct chromatic aberration well.

[0126] Please refer to Table 4 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0127] Table 4

[0128]

[0129]

[0130] In summary, the optical lens provided by the present invention employs seven lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as miniaturization, large aperture, large image height, large field of view, high pixel count, and high imaging quality.

[0131] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0132] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising seven lenses, characterized in that, It successively includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, its object side surface is concave, and its image side surface is concave; A second lens with a negative optical power, its object side surface is concave, and its image side surface is convex; A third lens with a positive optical power, its object side surface is convex, and its image side surface is concave; A fourth lens with a positive optical power, its object side surface is convex, and its image side surface is convex; A fifth lens with a positive optical power, its object side surface is convex, and its image side surface is convex; A sixth lens with a negative optical power, its object side surface is concave; A seventh lens with a positive optical power, its object side surface is convex near the optical axis, and its image side surface is concave near the optical axis; Wherein, the true image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 0.5 < (IH / 2) / (f×tan(FOV / 2)) < 0.55; The clear aperture semi-diameter CSD11 at the object side end of the first lens and the sagittal height SAGX11 of the clear aperture at the object side end of the first lens satisfy: -75 < CSD11 / SAGX11 < -50.

2. The optical lens according to claim 1, characterized in that, The overall optical length TTL of the optical lens and the f-number Fno of the optical lens satisfy: 15mm < TTL / Fno < 17mm.

3. The optical lens according to claim 1, characterized in that, The true image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 1.8 < IH / f < 1.

9.

4. The optical lens according to claim 1, characterized in that, The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.2 < f3 / f < 5.

5.

5. The optical lens according to claim 1, characterized in that, The curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -10 < (R3 + R4) / (R3 - R4) < -7.

5.

6. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens, the curvature radius R3 of the object side surface of the second lens, and the curvature radius R4 of the image side surface of the second lens satisfy: 11 < f2 / (R3 + R4) < 19.

7. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -1.4 < f1 / f < -1.1, and the curvature radius R1 of the object side surface of the first lens and the focal length f1 of the first lens satisfy: 24 < R1 / f1 < 29.

8. The optical lens according to claim 1, characterized in that, The clear aperture semi-diameter CSD11 at the object side end of the first lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.5 < CSD11 / IH < 0.

6.

9. The optical lens according to claim 1, characterized in that, The Abbe number Vd1 of the first lens and the Abbe number Vd2 of the second lens satisfy: 75 < Vd1 + Vd2 < 90.

10. The optical lens according to claim 1, characterized in that, The clear aperture semi-diameter CSD32 at the image side end of the third lens and the clear aperture semi-diameter CSD41 at the object side end of the fourth lens satisfy: 1 < CSD32 / CSD41 < 1.2.

Images