Optical lens
By using an optical lens with a six-lens structure and a lens design with specific optical power and surface shape, the problems of large size and heavy weight of traditional lenses are solved, achieving miniaturization, a large field of view, a large aperture and high image quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-31
- Publication Date
- 2026-04-07
AI Technical Summary
Traditional game console lenses use an all-glass lens structure, resulting in a large system size and weight, which limits the lightweight design of game devices and increases manufacturing costs.
It adopts a six-lens structure, including lenses with specific optical power and surface shape. Through reasonable allocation of optical power and matching of surface shape, it optimizes image quality, reduces aberrations, and improves image quality.
It achieves lens miniaturization, wide field of view, large aperture, high pixel count and high image quality, reducing manufacturing costs and improving user experience.
Smart Images
Figure CN121806243A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of imaging lenses, and particularly to an optical lens. Background Art
[0002] In recent years, with the rapid development of the electronic game industry, the application scenarios and user experience requirements of game devices have been continuously expanding, from traditional home video games to immersive virtual reality and augmented reality interactions, and even to portable cloud game terminals; the requirements for supporting optical lenses have also been increasing day by day. However, most traditional game console lenses adopt a structure of all-glass lenses, which have problems such as a relatively large system volume and high weight. This not only limits the lightweight design of the appearance and structure of game devices, but also increases the overall manufacturing cost. Summary of the Invention
[0003] Aiming at the above problems, the purpose of the present invention is to provide an optical lens with excellent imaging quality.
[0004] The present invention provides an optical lens, and the number of lenses with optical power is six. Along the optical axis from the object side to the imaging surface, it successively includes:
[0005] A first lens with negative optical power, whose object side is convex and whose image side is concave;
[0006] A second lens with negative optical power, whose object side is concave and whose image side is convex;
[0007] A third lens with positive optical power, whose object side is convex;
[0008] A fourth lens with positive optical power, whose object side is convex and whose image side is convex;
[0009] A fifth lens with negative optical power, whose object side is concave and whose image side is concave;
[0010] A sixth lens with positive optical power, whose object side is convex;
[0011] Wherein, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.3 < TTL / IH < 2.6; the effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 1.1 mm < f / Fno < 1.3 mm.
[0012] Further preferably, the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 2.3 < f456 / f < 2.6.
[0013] Further preferably, the maximum field of view FOV of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 145° / mm < FOV / EPD < 170° / mm.
[0014] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2 < f1 / f < -1.7; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 5.9 < R1 / R2 < 6.8.
[0015] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -16 < f2 / f < -2; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -1.9 < R3 / f < -1.3.
[0016] 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 < 3.3; the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < R5 / f < 2.1.
[0017] Further preferably, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.9 < f4 / f < 1.2.
[0018] Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.1 < f5 / f < -0.8; the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.8 < R10 / f < 4.4.
[0019] Further preferably, the clear aperture semi-diameter CSD11 of the object side surface of the first lens and the clear aperture semi-diameter CSD61 of the object side surface of the sixth lens satisfy: 1.8 < CSD11 / CSD61 < 2.9.
[0020] Further preferably, the sagittal height SAG11 of the clear aperture of the object side surface of the first lens and the central thickness CT1 of the first lens satisfy: 0.3 < SAG11 / CT1 < 0.9.
[0021] Compared with the prior art, the optical lens provided by the present invention adopts six lenses with specific optical powers. Through specific surface shape combinations and reasonable optical power distributions, it can improve the imaging quality of the optical lens, reduce aberration, improve the imaging quality of the optical lens, and enable the lens to have one or more advantages such as miniaturization, large field of view, large aperture, high pixel, and high imaging quality. Description of the Drawings
[0022] 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:
[0023] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.
[0024] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.
[0025] Figure 3 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.
[0026] Figure 4 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.
[0027] Figure 5 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.
[0028] Figure 6 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.
[0029] Figure 7 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.
[0030] Figure 8 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.
[0031] Figure 9 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.
[0032] Figure 10 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.
[0033] Figure 11 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.
[0034] Figure 12 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.
[0035] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation
[0036] 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] 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.
[0042] 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.
[0043] The optical lens provided by the embodiment of the present invention has six lenses with optical power. The optical lens sequentially includes, along the optical axis from the object side to the imaging surface: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.
[0044] In some embodiments, the first lens may have a negative optical power, its object side is convex, and its image side is concave. The second lens may have a negative optical power, its object side is concave, and its image side is convex. The third lens may have a positive optical power, its object side is convex, and its image side may be concave or convex. The fourth lens may have a positive optical power, its object side is convex, and its image side is convex. The fifth lens may have a negative optical power, its object side is concave, and its image side is concave. The sixth lens may have a positive optical power, its object side is convex, and its image side may be concave or convex.
[0045] In some embodiments, the optical lens may further include an aperture, and the aperture may be located between the third lens and the fourth lens. It can be understood that the aperture is used to limit the amount of incident light to change the brightness of the image. When the aperture is located between the third lens and the fourth lens, it is convenient for correcting the aperture aberration.
[0046] In some embodiments, the optical lens may further include a filter, and the filter is disposed between the sixth lens and the imaging surface. The filter is used to filter out interfering light to prevent the interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.
[0047] In some embodiments, the fourth lens and the fifth lens may be glued together to form a glued lens group with optical power, which can effectively correct the chromatic aberration of the optical lens, reduce the eccentricity sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; it can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.
[0048] In some embodiments, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.3 < TTL / IH < 2.6. By satisfying the above conditional formula and reasonably configuring the total optical length and image height of the optical lens, it is possible to effectively shorten the total optical length of the optical lens while ensuring that the optical lens has a high pixel count, so that the optical lens meets the requirements of miniaturization and has a high imaging quality.
[0049] In some embodiments, the effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 1.1 mm < f / Fno < 1.3 mm. Meeting the above conditional formula is conducive to the optical lens obtaining the characteristic of a large aperture, enabling the optical lens to have sufficient light input, thereby facilitating clearer captured images; at the same time, the short focal length combined with the large aperture enables the optical lens to have a large wide-angle field of view to capture more scene information, while solving the problem of low-light shooting through the large aperture, and strengthening the sense of hierarchy of the picture with flexible depth-of-field control.
[0050] In some embodiments, the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens and the effective focal length f of the optical lens satisfy: 2.3 < f456 / f < 2.6. Meeting the above conditional formula, the rear group lens formed by the combination of the fourth lens to the sixth lens has a positive optical power, which is conducive to correcting the chromatic aberration and field curvature of the optical lens, as well as slowing down the light deflection angle, reducing sensitivity, reducing the lens molding difficulty, and being able to achieve the balance of overall spherical aberration to obtain good imaging quality for the on-axis field of view.
[0051] In some embodiments, the maximum field of view FOV of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 145° / mm < FOV / EPD < 170° / mm. Meeting the above conditional formula enables the optical lens to have a larger field of view range and a larger entrance pupil diameter, and can also reflect the large aperture effect and a relatively large depth-of-field range of the optical lens, that is, the optical lens can achieve clear imaging at infinity and large angles while still having a clear recognition ability for nearby scenes, with high imaging quality.
[0052] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2 < f1 / f < -1.7. Meeting the above conditional formula makes the first lens have a negative optical power, which can diverge the light passing through it, expand the field of view of the optical lens, and simplify the aberration correction of the overall optical lens and the balance of imaging quality.
[0053] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 5.9 < R1 / R2 < 6.8. Meeting the above conditional formula, reasonably controlling the curvature radii of the object side surface and the image side surface of the first lens, making both the object side surface and the image side surface of the first lens concave surfaces, can enable light rays at a larger angle with the optical axis to enter the optical lens, thereby contributing to further increasing the field of view of the optical lens, while also being conducive to the miniaturization of the optical lens and being able to correct the system spherical aberration.
[0054] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -16 < f2 / f < -2. By satisfying the above conditional expression and setting the second lens to have a negative optical power, the incident angle of light can be further controlled, the field angle range of the optical lens can be expanded, the back focal length of the optical lens can be increased simultaneously, interference between the lens and the photosensitive chip can be avoided, and aberration correction is also facilitated, which can further improve the imaging quality of the optical lens.
[0055] In some embodiments, the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -1.9 < R3 / f < -1.3. By satisfying the above conditional expression and reasonably setting the object side surface of the second lens to be concave, it is beneficial to converge light while reducing the deflection angle of light, shortening the distance for light to reach the next lens, and facilitating the reduction of the overall length of the lens.
[0056] 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 < 3.3. By satisfying the above conditional expression, the third lens has the function of converging light. When paired with the negative optical powers of the first lens and the second lens, the light passing through the second lens can be further converged, the height of peripheral light can be depressed, which is beneficial to the reduction of the aperture of the rear lens, and is also beneficial to balancing aberrations and improving resolution.
[0057] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < R5 / f < 2.1. By controlling the ratio of the curvature radius of the third lens to the effective focal length of the entire optical lens within a certain range, the astigmatism of the third lens can be within a reasonable range, and it can effectively balance the astigmatism generated by the previous lenses, so that the optical lens has good imaging quality.
[0058] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.9 < f4 / f < 1.2. By satisfying the above conditional expression and setting the fourth lens to have a relatively large positive optical power, the light from the first three lenses can be further converged, the aberration problems brought by the first three lenses can be corrected, and the aberration of the edge field can be effectively improved, thus enhancing the overall imaging quality of the optical lens.
[0059] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.1 < f5 / f < -0.8. By satisfying the above conditional expression and setting the fifth lens to have a negative optical power, the light in the large field of view is slowly lifted, changing the parallel light trend of the light beam to a divergent trend, which is beneficial to controlling the back focus of the lens and facilitating the realization of a large target surface.
[0060] In some embodiments, the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.8 < R10 / f < 4.4. By satisfying the above conditional formula and controlling the ratio of the radius of curvature of the image side surface of the fifth lens to the effective focal length of the optical lens within a certain range, the astigmatism of the fifth lens can be within a reasonable range, and the astigmatism generated by the previous lenses can be effectively balanced, so that the optical lens has good imaging quality.
[0061] In some embodiments, the clear aperture semi-diameter CSD11 of the object side surface of the first lens and the clear aperture semi-diameter CSD61 of the object side surface of the sixth lens satisfy: 1.8 < CSD11 / CSD61 < 2.9. By satisfying the above conditional formula and controlling the ratio of the clear aperture semi-diameter of the object side end of the first lens to the clear aperture semi-diameter of the object side end of the sixth lens, the optical lens can have a smaller aperture size, which is convenient for being mounted on vehicle-mounted devices; at the same time, it ensures that the optical lens can collect light rays at a large angle, realizes large field angle imaging of the optical lens, increases the imaging area of the optical lens, and improves the imaging quality.
[0062] In some embodiments, the sag SAG11 of the clear aperture of the object side surface of the first lens and the central thickness CT1 of the first lens satisfy: 0.3 < SAG11 / CT1 < 0.9. By satisfying the above conditional formula and controlling the ratio of the sag of the object side surface of the first lens to the central thickness of the first lens on the optical axis, the surface shape of the object side surface can be biased towards being curved and the sag is larger, which is beneficial for the first lens to collect light rays in a large field of view, realizes high angular resolution at the center of the optical lens, and further improves the imaging quality of the central region.
[0063] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 2 < f6 / f < 16. By satisfying the above conditional formula and limiting that the sixth lens has a positive optical power, it is beneficial for light rays to converge, so that chromatic aberration can be effectively corrected. At the same time, as the last lens, the sixth lens can finally correct the aberration generated by the decentration difference of each lens on the object side, that is, it can reduce the decentration sensitivity of the optical lens and suppress the astigmatism generated by the decentration of each lens on the object side, so as to realize the correction of the aberration of the optical lens and improve the imaging resolution.
[0064] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the effective focal length f of the optical lens satisfy: 1.4 < R11 / f < 1.9. By satisfying the above conditional formula, the ratio of the radius of curvature of the object side surface of the sixth lens to the effective focal length of the optical lens is reasonably configured, which is beneficial for the sixth lens to gently receive the incident light rays, reduce the introduction of aberration, and make the optical lens have good imaging quality.
[0065] In some embodiments, the clear semi-diameter CSD51 of the object side surface of the fifth lens and the sag SAG51 of the clear semi-diameter of the object side surface of the fifth lens satisfy: -2.8 < CSD51 / SAG51 < -2. By satisfying the above conditional formula, by adjusting the surface shape of the edge region of the object side surface of the fifth lens, the ghost reflection energy can be reduced and the field curvature can be optimized, thereby improving the imaging quality of the optical lens.
[0066] In some embodiments, the clear semi-diameter CSD22 of the image side surface of the second lens and the clear semi-diameter CSD31 of the object side surface of the third lens satisfy: 0.9 < CSD22 / CSD31 < 1.3. By satisfying the above conditional formula, the high-angle light rays that are prone to coma can be selectively filtered, so that the light beam is more evenly distributed on the third lens, ensuring that the light rays are incident on the subsequent optical elements at the optimal angle, reducing energy loss and scattering.
[0067] In some embodiments, the clear semi-diameter CSD11 of the object side surface of the first lens and the distance CT12 between the first lens and the second lens on the optical axis satisfy: 1.3 < CSD11 / CT12 < 2.6. By satisfying the above conditional formula, by controlling the clear aperture of the object side surface of the first lens and reducing the air gap between the first lens and the second lens, it is beneficial to reduce the total length of the optical lens, make the arrangement of the optical lens more compact, and reduce the risk of ghost image generation; furthermore, it is also beneficial to reduce the difficulty of the structural arrangement of the optical lens and improve the yield rate of the assembly and molding of the optical lens.
[0068] 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: 2.5 < IH / f < 2.8. By satisfying the above conditional formula, controlling the ratio of the effective focal length to the image height of the optical lens, shortening the effective focal length can expand the field angle, enabling the optical lens to capture a wider object side space, increasing the width of the light beam incident on the optical lens, improving the brightness at the image plane of the optical lens and avoiding vignetting; at the same time, enabling the optical lens to have the characteristics of a large image plane, matching a large image plane chip to improve the resolution, and ensuring the imaging quality of the optical lens.
[0069] In some embodiments, the optical lens satisfies the following conditions: 2.2mm < f < 2.5mm; 15mm < TTL < 16mm; 170° < FOV < 205°; 1.1mm < EPD < 1.3mm; 1.9 < Fno < 2.1; 5.9mm < IH < 6.7mm; 25° < CRA < 42°. In these conditions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view of the optical lens, EPD represents the entrance pupil diameter 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, and CRA represents the principal ray incident angle at the maximum image height of the optical lens. By satisfying these conditions, the optical lens possesses at least one or more advantages, including short focal length, miniaturization, ultra-wide field of view, large entrance pupil diameter, large aperture, large image plane, low distortion, low sensitivity, and high pixel count.
[0070] In some embodiments, the six lenses in the optical lens can all be made of plastic or a combination of glass and plastic materials. Preferably, the optical lens of the present invention uses a six-lens structure with a combination of glass and plastic materials, which can improve thermal stability. Specifically, the first lens can be made of glass, while the second, third, fourth, fifth, and sixth lenses are all made of plastic. The use of a glass-plastic hybrid structure can effectively reduce costs, correct aberrations, reduce size and weight, and provide a more cost-effective optical lens product.
[0071] In some embodiments, the first, second, third, fourth, fifth, and sixth 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 lens in the optical lens provided by this invention can be a spherical lens; the second, third, fourth, fifth, and sixth lenses can all be aspherical lenses.
[0072] 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:
[0073]
[0074] 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, F, G, and H are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively.
[0075] 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.
[0076] Example 1
[0077] 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 surface S14, 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, and a filter G1.
[0078] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave.
[0079] The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is convex.
[0080] The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is convex.
[0081] The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side is convex.
[0082] The fifth lens L5 has negative optical power, its object side is concave, and its image side S9 is concave.
[0083] The fourth lens L4 and the fifth lens L5 form a cemented lens group with optical power, that is, the cemented surface of the image side of the fourth lens L4 and the object side of the fifth lens L5 is S8.
[0084] The sixth lens L6 has positive optical power, its object side S10 is convex, and its image side S11 is concave.
[0085] The object-side surface S12 and the image-side surface S13 of the filter G1 are both planar.
[0086] The imaging plane S14 is a plane.
[0087] The first lens L1 is a glass spherical lens; the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all plastic aspherical lenses.
[0088] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.
[0089] Table 1-1
[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]
[0094]
[0095] In this embodiment, the astigmatism curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 As shown.
[0096] Figure 2 The astigmatism curve of Example 1 is shown, which represents the astigmatism of light in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field of view (unit: °). As can be seen from the figure, the astigmatism in the meridional and sagittal image planes is controlled within ±0.05 mm, indicating that the optical lens can effectively correct the field curvature.
[0097] Figure 3 The diagram shows the axial aberration curves for Example 1, representing the aberrations of each wavelength along the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. The diagram shows that the axial aberration offset is controlled within ±0.02 mm, indicating that the optical lens can effectively correct axial aberrations.
[0098] Figure 4 The diagram shows the transverse chromatic aberration curves for Example 1, representing the chromatic aberration of each wavelength relative to the center wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -2 μm to 3 μm, indicating that the optical lens can effectively correct chromatic aberration.
[0099] Example 2
[0100] Please see Figure 5The figure shows 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 image side surface S11 of the sixth lens L6 is a convex surface; 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]
[0105] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.
[0106] Table 2-2
[0107] Face number K B C D E F G H S3 -1.34E+00 -1.26E-03 5.49E-04 -6.93E-06 -1.95E-05 -1.23E-06 5.03E-07 6.75E-10 S4 7.59E+00 1.34E-03 5.97E-04 6.32E-06 -9.62E-06 -2.74E-06 -2.99E-07 1.38E-07 S5 0.00E+00 2.03E-03 1.06E-04 4.02E-05 -1.03E-06 -1.43E-06 -1.81E-07 1.23E-08 S6 0.00E+00 1.89E-03 2.87E-04 4.74E-05 -5.08E-07 -2.17E-06 -6.46E-07 -7.60E-09 S7 -1.65E+00 8.25E-04 8.07E-04 3.12E-05 -1.52E-05 -1.94E-06 1.16E-06 1.34E-07 S8 -1.61E+00 6.47E-03 -1.12E-02 6.62E-04 6.95E-04 -6.64E-05 -9.94E-05 2.07E-05 S9 -1.85E+00 -5.36E-03 1.41E-03 8.45E-05 -9.44E-06 -2.55E-06 3.24E-07 -6.26E-08 S10 -1.01E+01 -5.08E-03 -1.28E-03 -6.16E-05 1.66E-06 -2.23E-08 -9.37E-08 -4.86E-07 S11 -3.48E+00 4.08E-04 -1.10E-03 -1.91E-04 1.17E-05 4.09E-06 -9.08E-07 -3.56E-07
[0108] In this embodiment, the astigmatism curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.
[0109] from Figure 6 As can be seen, the astigmatism of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct field curvature.
[0110] from Figure 7 As can be seen, the axial aberration offset is controlled within ±0.02mm, indicating that the optical lens can effectively correct axial aberration.
[0111] from Figure 8 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within 0 to 3 μm, indicating that the optical lens can effectively correct chromatic aberration.
[0112] Example 3
[0113] Please see Figure 9 The figure shows 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 image-side surface S6 of the third lens L3 is concave, the image-side surface S11 of the sixth lens L6 is convex, 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 G H S3 -1.31E+00 -1.68E-03 -6.51E-05 3.65E-05 -1.62E-06 -1.49E-06 -1.25E-07 3.81E-08 S4 3.67E+01 -2.14E-03 8.65E-05 1.17E-05 -4.56E-07 -2.63E-07 -2.09E-08 2.02E-08 S5 0.00E+00 2.65E-04 -3.31E-04 -2.52E-05 -3.30E-06 -9.94E-07 -2.89E-07 -7.36E-08 S6 0.00E+00 2.36E-03 2.34E-05 -1.42E-04 -2.99E-05 -2.17E-06 2.48E-07 -4.12E-08 S7 -1.37E+00 2.12E-03 9.58E-04 1.80E-04 -2.71E-06 -1.51E-05 -2.30E-06 4.83E-06 S8 -7.62E-01 8.47E-03 -1.10E-02 -7.60E-04 3.99E-04 8.62E-05 -2.61E-05 -2.30E-05 S9 -9.14E-01 -2.55E-03 1.92E-03 2.54E-04 3.91E-06 -9.57E-06 -1.32E-06 9.03E-07 S10 -7.16E+00 -3.11E-03 -4.70E-04 -4.25E-05 -8.86E-06 -1.64E-06 1.19E-07 1.55E-07 S11 2.84E+01 1.07E-03 -6.87E-04 -6.27E-05 9.86E-07 6.75E-07 4.06E-08 -1.12E-08
[0121] In this embodiment, the astigmatism curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 10 , Figure 11 , Figure 12 As shown.
[0122] from Figure 10 As can be seen, the astigmatism of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens can effectively correct field curvature.
[0123] from Figure 11 As can be seen, the axial aberration offset is controlled within -0.03mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration.
[0124] from Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within 0 to 3 μm, indicating that the optical lens can effectively correct chromatic aberration.
[0125] 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, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values corresponding to each conditional expression in each embodiment.
[0126] Table 4
[0127] Parameters and conditional expressions Example 1 Example 2 Example 3 f(mm) 2.44 2.30 2.33 EPD (mm) 1.22 1.15 1.17 TTL(mm) 15.50 15.50 15.50 Fno 2.00 2.00 2.00 CRA(°) 41.33 25.25 27.30 IH(mm) 6.61 6.00 6.32 FOV (°) 200.00 172.00 180.00 TTL / IH 2.35 2.58 2.45 f / Fno(mm) 1.22 1.15 1.17 f456 / f 2.57 2.38 2.34 FOV / EPD (° / mm) 164.15 149.45 154.31 f1 / f -1.97 -1.80 -1.75 R1 / R2 6.74 5.95 6.13 f2 / f -15.87 -2.87 -3.91 R3 / f -1.53 -1.36 -1.80 f3 / f 3.23 2.27 2.35 R5 / f 2.03 1.71 1.54 f4 / f 1.16 1.04 0.99 f5 / f -1.06 -0.84 -0.87 R10 / f 4.33 1.83 2.56 CSD11 / CSD61 1.90 2.86 2.82 f6 / f 15.09 2.07 2.69 R11 / f 1.73 1.86 1.49 CSD51 / SAG51 -2.73 -2.31 -2.07 CSD22 / CSD31 1.22 1.00 1.08 SAG11 / CT1 0.39 0.79 0.73 CSD11 / CT12 2.51 1.41 1.66 IH / f 2.71 2.61 2.71
[0128] In summary, the optical lens provided by the present invention employs six 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 field of view, large aperture, high pixel count, and high imaging quality.
[0129] 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.
[0130] 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 six lenses having optical power, characterized in that, It sequentially includes from the object side to the imaging surface along the optical axis: A first lens with a negative optical power, whose object side surface is convex and whose image side surface is concave; A second lens with a negative optical power, whose object side surface is concave and whose image side surface is convex; A third lens with a positive optical power, whose object side surface is convex; A fourth lens with a positive optical power, whose object side surface is convex and whose image side surface is convex; A fifth lens with a negative optical power, whose object side surface is concave and whose image side surface is concave; A sixth lens with a positive optical power, whose object side surface is convex; Wherein, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 2.3 < TTL / IH < 2.6; the effective focal length f of the optical lens and the f-number Fno of the optical lens satisfy: 1.1 mm < f / Fno < 1.3 mm.
2. The optical lens according to claim 1, characterized in that, The combined focal length f456 of the fourth lens, the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 2.3 < f456 / f < 2.
6.
3. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 145° / mm < FOV / EPD < 170° / mm.
4. 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: -2 < f1 / f < -1.7; the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 5.9 < R1 / R2 < 6.
8.
5. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -16 < f2 / f < -2; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -1.9 < R3 / f < -1.
3.
6. 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 < 3.3; the curvature radius R5 of the object side surface of the third lens and the effective focal length f of the optical lens satisfy: 1.5 < R5 / f < 2.
1.
7. The optical lens according to claim 1, characterized in that, The focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 0.9 < f4 / f < 1.
2.
8. The optical lens according to claim 1, characterized in that, The focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.1 < f5 / f < -0.8; the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.8 < R10 / f < 4.
4.
9. The optical lens according to claim 1, characterized in that, The clear aperture semi-diameter CSD11 of the object side surface of the first lens and the clear aperture semi-diameter CSD61 of the object side surface of the sixth lens satisfy: 1.8 < CSD11 / CSD61 < 2.
9.
10. The optical lens according to claim 1, characterized in that, The sagittal height SAG11 of the clear aperture of the object side surface of the first lens and the central thickness CT1 of the first lens satisfy: 0.3 < SAG11 / CT1 < 0.9.