Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence from an object side to an imaging surface along an optical axis, and the six lenses comprise: a first lens with positive refractive power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens with negative refractive power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; a third lens with positive refractive power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens with negative refractive power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens with positive refractive power, wherein the image side surface of the fifth lens is a convex surface near the optical axis, and the image side surface of the fifth lens is a convex surface; and a sixth lens with negative refractive power, wherein the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface near the optical axis; the focal length f1 of the first lens, the object side surface curvature radius R1 of the first lens and the image side surface curvature radius R2 of the first lens satisfy 1.1<(R2-R1) / f1<1.4. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens.

Description

Technical Field

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

[0002] In recent years, as consumers' demands for smartphone photography quality have continued to rise, the application of 6P lenses has become increasingly widespread. They are no longer limited to high-end models; many mid-range and low-end phones are also adopting 6P lenses to enhance their market competitiveness. Although 7P, 8P, and even higher-spec lenses have emerged, their overall length is relatively long, which is detrimental to the slimming and lightweight design of phones. 6P lenses, with their cost-effectiveness and good performance, still maintain a mainstream position in the market.

[0003] Currently, the mainstream trends in the development of portable electronic products are ultra-thinness, wide field of view, and ultra-high-definition imaging, which places higher demands on the optical lenses mounted on portable electronic products. 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 six lenses, arranged sequentially along the optical axis from the object side to the imaging plane:

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

[0008] A second lens with negative optical power has a convex object-side surface and a convex image-side surface;

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

[0010] The fourth lens with negative optical power has a concave object side and a convex image side.

[0011] The fifth lens with positive optical power has a convex image-side surface near the optical axis.

[0012] The sixth lens with negative optical power has a concave object side and a concave image side near the optical axis.

[0013] Wherein, the focal length f1 of the first lens, the object side radius of curvature R1 of the first lens, and the image side radius of curvature R2 of the first lens satisfy: 1.1 < (R2 - R1) / f1 < 1.4.

[0014] Further preferably, the effective focal length f of the optical lens and the combined focal length f34 of the third and fourth lenses satisfy: -14 <f34 / f<-5。

[0015] Further preferably, the effective focal length f of the optical lens and the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens satisfy: -1.7 <f456 / f<-1.1。

[0016] Further preferably, the center thickness CT5 of the fifth lens and the edge thickness ET5 of the fifth lens satisfy: 2.2 <CT5 / ET5<2.7。

[0017] Further preferably, the center thickness CT6 of the sixth lens and the edge thickness ET6 of the sixth lens satisfy: 1 <ET6 / CT6<2。

[0018] Further preferably, the optical axis spacing AT3 between the third lens and the fourth lens, the optical axis spacing AT4 between the fourth lens and the fifth lens, and the optical axis spacing AT5 between the fifth lens and the sixth lens satisfy: 0.1 <AT3 / (AT4+AT5)<0.3。

[0019] More preferably, the combined focal length f34 of the third lens and the fourth lens satisfies the following condition with respect to the back focal length BFL of the optical lens: -60°. <f34 / BFL<-25。

[0020] Further preferably, the sum of the center thicknesses ∑CT of the first lens to the sixth lens and the sum of the distances on the optical axis between any two adjacent lenses from the first lens to the sixth lens ∑AT satisfy: 2.3 < ∑CT / ∑AT < 2.8.

[0021] Further preferably, the focal length f4 of the fourth lens, the object-side radius of curvature R41 of the fourth lens, and the image-side radius of curvature R42 of the fourth lens satisfy: 2 < (R41 + R42) / f4 < 3.5.

[0022] Further preferably, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -6.5 <f2 / f<-3。

[0023] The optical lens provided by this invention uses 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, high pixel count, and high imaging quality. Attached Figure Description

[0024] 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:

[0025] Figure 1 This is a schematic diagram of the optical lens structure in Embodiment 1 of the present invention.

[0026] Figure 2 This is an astigmatism curve diagram of the optical lens in Embodiment 1 of the present invention.

[0027] Figure 3 This is a graph showing the f-tan(θ) distortion curve of the optical lens in Embodiment 1 of the present invention.

[0028] Figure 4 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0029] Figure 5 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0030] Figure 6 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0031] Figure 7 This is an astigmatism curve of the optical lens in Embodiment 2 of the present invention.

[0032] Figure 8 This is a graph showing the f-tan(θ) distortion curve of the optical lens in Embodiment 2 of the present invention.

[0033] Figure 9 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0034] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0035] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0036] Figure 12 This is an astigmatism curve diagram of the optical lens in Embodiment 3 of the present invention.

[0037] Figure 13 This is a graph showing the f-tan(θ) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0038] Figure 14 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0039] Figure 15 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0040] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] The optical lens provided in this embodiment of the invention includes six 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, and a sixth lens.

[0049] In some embodiments, the first lens may have positive optical power, with a convex object-side surface and a concave image-side surface. 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 a concave object-side surface and a convex image-side surface. The fourth lens may have negative optical power, with a concave object-side surface and a convex image-side surface. The fifth lens may have positive optical power, with its image-side surface being convex near the optical axis. The sixth lens may have negative optical power, with both its object-side and image-side surfaces being concave near the optical axis.

[0050] In some embodiments, the optical lens may also include an aperture stop, which may be located between the object side and the first lens. It is understood that the aperture stop is used to limit the amount of light entering the lens, thereby altering the brightness of the image.

[0051] In some embodiments, the optical lens may further include a filter, which may be disposed between the sixth lens and the imaging surface. The filter is used to filter out interfering light and prevent interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0052] In some embodiments, the focal length f1 of the first lens, the object-side radius of curvature R1 of the first lens, and the image-side radius of curvature R2 of the first lens satisfy the condition: 1.1 < (R2 - R1) / f1 < 1.4. By satisfying this condition, the ratio of the difference between the image-side and object-side radii of curvature of the first lens to the effective focal length of the system is controlled within a certain range. This allows the radius of curvature of the first lens to be kept within a reasonable range, reducing the sensitivity of the first lens. This is beneficial for the camera lens to have better chromatic aberration correction capabilities and for maintaining a suitable lens length.

[0053] In some embodiments, the effective focal length f of the optical lens and the combined focal length f34 of the third lens and the fourth lens satisfy: -14 < f34 / f < -5. Meeting the above conditions and controlling the ratio of the combined focal length of the third lens and the fourth lens of the imaging lens to the effective focal length of the imaging lens can control the contribution of the third lens and the fourth lens to the entire imaging lens. Controlling the contribution of the third lens and the fourth lens within a reasonable range can reduce optical aberrations such as spherical aberration and coma of the imaging lens; at the same time, it can reasonably control the contribution range of the optical power and the contribution rate of its secondary spherical aberration, thereby obtaining good imaging quality and achieving the effect of high resolution.

[0054] In some embodiments, the effective focal length f of the optical lens and the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens satisfy: -1.7 < f456 / f < -1.1. Meeting the above conditions can make the combination of the fourth lens, the fifth lens, and the sixth lens act as an optical lens group with a reasonable negative optical power to balance the aberration generated by the optical lens group with a positive optical power at the front end, thereby obtaining good imaging quality.

[0055] In some embodiments, the central thickness CT5 of the fifth lens and the edge thickness ET5 of the fifth lens satisfy: 2.2 < CT5 / ET5 < 2.7. Meeting the above conditions can reasonably configure the edge thickness and central thickness of the fifth lens, control the shape of the fifth lens, comprehensively balance the spherical aberration, chromatic aberration, and field curvature of the optical system, and improve the imaging quality of the optical system.

[0056] In some embodiments, the central thickness CT6 of the sixth lens and the edge thickness ET6 of the sixth lens satisfy: 1 < ET6 / CT6 < 2. Meeting the above conditions can make the overall thickness of the sixth lens close, reasonably utilize the rear-end space of the optical system, and reduce the manufacturing difficulty. Below the lower limit, the proportion of the edge thickness of the sixth lens is small, and it is difficult for the supporting part to reach the thickness standard; above the upper limit, the sixth lens becomes too thick, resulting in excessive occupation of space by the external supporting part.

[0057] In some embodiments, the spacing AT3 of the third lens and the fourth lens on the optical axis, the spacing AT4 of the fourth lens and the fifth lens on the optical axis, and the spacing AT5 of the fifth lens and the sixth lens on the optical axis satisfy: 0.1 < AT3 / (AT4 + AT5) < 0.3. Meeting the above conditions is beneficial to shortening the total system length and adjusting the off-axis optical path of the system; it is beneficial to reducing the incident angle of off-axis light and improving the imaging quality.

[0058] In some embodiments, the combined focal length f34 of the third lens and the fourth lens and the back focal length BFL of the optical lens satisfy: -60 < f34 / BFL < -25. Meeting the above conditions is beneficial to balancing the aberrations of the third lens and the fourth lens, especially the lateral aberrations, on the one hand; on the other hand, it can control the angle of light, thereby avoiding the light hitting the lens barrel and forming stray light at the end.

[0059] In some embodiments, the sum ∑CT of the central thicknesses of the first lens to the sixth lens and the sum ∑AT of the distances between any two adjacent lenses of the first lens to the sixth lens on the optical axis satisfy: 2.3 < ∑CT / ∑AT < 2.8. Meeting the above conditions is beneficial to controlling the overall optical length of the lens by reasonably defining the edge thicknesses of each lens and the distances between the lenses, thereby achieving miniaturization of the lens volume.

[0060] In some embodiments, the focal length f4 of the fourth lens, the curvature radius R41 of the object side surface of the fourth lens, and the curvature radius R42 of the image side surface of the fourth lens satisfy: 2 < (R41 + R42) / f4 < 3.5. Meeting the above conditions is helpful to reducing the sensitivity of the optical lens, reducing the difficulty of lens forming, improving the lens manufacturing yield, and at the same time being beneficial to reducing the stray light generated by the optical lens and improving the imaging quality of the optical lens by reasonably controlling the surface shape and focal length of the fourth lens.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -6.5 < f2 / f < -3. Meeting the above conditions reduces the degree of deflection of the light from the first lens, making the light trend stable and effectively balancing the aberrations brought by the first lens.

[0062] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 2 < f3 / f < 3.5. Meeting the above conditions enables the third lens to bear a large positive refractive power, which is beneficial to accelerating the deflection trend of light and promoting miniaturization of the structure of the optical lens.

[0063] In some embodiments, 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: 1.3 < R3 / R4 < 2. Meeting this conditional formula can effectively control the refraction angle of the system light beam in the second lens and achieve good processing characteristics of the system.

[0064] In some embodiments, the distance AT1 between the first lens and the second lens on the optical axis, the distance AT2 between the second lens and the third lens on the optical axis, the distance AT4 between the fourth lens and the fifth lens on the optical axis, and the distance AT5 between the fifth lens and the sixth lens on the optical axis satisfy: 0.7 < (AT1 + AT2) / (AT4 + AT5) < 1. By satisfying the above conditions, the optical lens is reasonably controlled to make better use of the space in the optical lens. On the premise of maintaining high imaging quality, an optical lens with a shorter total length is obtained.

[0065] In some embodiments, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the central thickness CT3 of the third lens satisfy: 2.3 < f123 / (CT1 + CT2 + CT3) < 2.9. By restricting the relationship between the focal length and the central thickness of the first three lenses, mainly to improve the distribution of the optical power, and further improve various aberrations such as spherical aberration, coma, astigmatism, field curvature, distortion, etc. of the optical system. At the same time, it is beneficial to optimize the shape of the lens, enhance the manufacturability of the optical system, and reduce the sensitivity of the optical system.

[0066] In some embodiments, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 1.1 < CT3 / CT2 < 1.3. By satisfying the above conditions, by controlling the ratio of the central thickness of the third lens to the second lens, the overall thickness of the first lens can be effectively controlled, realizing the miniaturized design of the optical lens, and at the same time, it is beneficial to reduce the sensitivity of the optical lens.

[0067] In some embodiments, the central thickness CT1 of the first lens and the central thickness CT6 of the sixth lens satisfy: 1.6 < CT1 / CT6 < 2.2. By satisfying the above conditions, it is beneficial to reasonably allocate the on-axis space of the system, and achieve a good balance between the processing manufacturability of the first lens and the sixth lens and shortening the total length of the system.

[0068] In some embodiments, the effective focal length f of the optical lens, the true image height IH corresponding to the maximum field angle, and the back focal length BFL of the optical lens satisfy: 0.7 < IH × BFL / f < 0.9. By satisfying the above conditional formula and reasonably controlling the relationship formula of IH, BFL, and f, it is beneficial to ensure that the optical system has a long back focal length, and the distribution of the lenses in the optical lens in space can be reasonably allocated, and the optical lens can be designed to be ultrathin while achieving high pixels.

[0069] In some embodiments, the central thickness CT4 of the fourth lens and the sagittal height SAGX42A of the clear aperture on the image side of the fourth lens satisfy: -0.8 < SAGX42 / CT4 < -0.4. Meeting the above conditions can effectively suppress the angle of light incident on the image sensing element in the off-axis field of view, and can further correct the aberration of the off-axis field of view.

[0070] In some embodiments, the entrance pupil diameter EPDI of the optical lens and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.7 < EPDI / IH < 0.8. Meeting the above conditions is beneficial to ensuring the illuminance of the camera lens, can effectively increase the light transmission amount of the camera lens, make it have a relatively high relative illuminance, can well improve the imaging quality of the camera lens in a darker environment, make the camera lens more practical, and is also beneficial to realizing the characteristic of a large image plane of the camera lens.

[0071] In some embodiments, the clear aperture semi-diameter CSD11 on the object side of the first lens and the clear aperture semi-diameter CSD32 on the image side of the third lens satisfy: 1 < CSD11 / CSD32 < 1.3. Meeting the above conditions is beneficial to the camera lens to increase the height of the imaging plane and the effective focal length of the camera lens, and is also beneficial to the camera lens to better balance the aberration of the edge field of view.

[0072] In some embodiments, the focal length f4 of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 1.8 < R8 / f4 < 2.6. Meeting the above conditions, by limiting the ratio of the radius of curvature of the image side of the fourth lens to its focal length, the degree of light deflection when passing through the lens can be weakened, thereby improving the imaging quality and being beneficial to realizing the miniaturization of the lens volume.

[0073] In some embodiments, the central thickness CT6 of the sixth lens and the sagittal height SAGX62 of the clear aperture on the image side of the sixth lens satisfy: 1.2 < |SAGX62| / CT6 < 2.5. When the above relationship is met, the sixth lens can be reasonably configured to reduce the incident angle of the light reaching the image plane, so that the light can converge better on the image plane for imaging, and at the same time effectively control the incident angle of the marginal light of the maximum field of view on the object side of the sixth lens, avoiding the excessive incident angle of the chief ray on the image plane resulting in a decrease in imaging quality, thereby improving the imaging quality of the optical lens.

[0074] In some embodiments, the optical lens satisfies the following conditional expressions: 3.6 mm < f < 4.5 mm; 75° < FOV < 85°; 4.5 mm < TTL < 5.5 mm; FNO < 1.7; 6.5 mm < IH < 7.5 mm; 30° < CRA < 40°. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, 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 angle of the optical lens, and CRA represents the principal ray incident angle at the maximum image height of the optical lens. Meeting the above ranges, the optical lens has at least one or more advantages such as miniaturization, large aperture, and high pixel count.

[0075] In some embodiments, the lens material of the optical lens provided by the present invention can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. Additionally, when the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present invention can adopt an all-plastic lens structure, which can make the lens structure relatively compact, and can better achieve the balance between lens miniaturization and high image quality, and reduce costs.

[0076] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can adopt spherical lenses or aspherical lenses. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens of the present invention all adopt aspherical lenses.

[0077] In various embodiments of the present invention, when the lens adopts an aspherical lens, the shapes of the aspherical surfaces of the optical lens satisfy the following equation:

[0078]

[0079] where z is the distance between the surface and the vertex of the surface in the optical axis direction, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the conic coefficient, and B, C, D, E, F, G, H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order surface coefficients respectively.

[0080] 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.

[0081] Example 1

[0082] Please see Figure 1 The diagram shown is a structural schematic 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: aperture ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, and filter G1.

[0083] Among them, the first lens L1 has positive optical power, its object side S1 is convex, and its image side S2 is concave.

[0084] The second lens L2 has negative optical power, its object side S3 is convex, and its image side S4 is concave.

[0085] The third lens L3 has positive optical power, its object side S5 is concave, and its image side S6 is convex.

[0086] The fourth lens L4 has negative optical power, its object side S7 is concave, and its image side S8 is convex.

[0087] The fifth lens L5 has positive optical power, its object side S9 is convex near the optical axis, and its image side S10 is convex.

[0088] The sixth lens L6 has negative optical power, its object side S11 is concave, and its image side S12 is concave near the optical axis.

[0089] The object-side surface S13 and the image-side surface S14 of filter G1 are both planar.

[0090] The imaging plane S15 is a plane.

[0091] The first lens L1, 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.

[0092] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0093] Table 1-1

[0094]

[0095] The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0096] Table 1-2

[0097]

[0098]

[0099] In this embodiment, the astigmatism curve, f-tan(θ) distortion curve, axial aberration, and transverse chromatic aberration curves of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown.

[0100] Figure 2 The astigmatism curve of Embodiment 1 is shown, which represents the degree of curvature of light of different wavelengths in the meridional and sagittal image planes. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field of view (unit: °). As can be seen from the figure, the astigmatism in the meridional and sagittal image planes is controlled within ±0.1 mm, indicating that the optical lens 100 can effectively correct astigmatism.

[0101] Figure 3 The f-tan(θ) distortion curves for Example 1 are shown, representing the f-tan(θ) distortion at different image heights on the imaging plane. The horizontal axis represents the f-tan(θ) distortion value (unit: %), and the vertical axis represents the field of view (unit: °). As can be seen from the figure, the f-tan(θ) distortion of the optical lens 100 is controlled within ±1.5%, indicating that the distortion of the optical lens 100 is well corrected.

[0102] Figure 4 The diagram shows the axial aberration curves for Embodiment 1, which represent 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. As can be seen from the diagram, the axial aberration offset is controlled within ±0.03 mm, indicating that the optical lens 100 can effectively correct axial aberrations.

[0103] Figure 5 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 ±1 μm, indicating that the optical lens 100 can effectively correct chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane.

[0104] Example 2

[0105] 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.

[0106] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0107] Table 2-1

[0108]

[0109]

[0110] The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0111] Table 2-2

[0112] Face number K B C D E F G H S1 2.36E-01 -1.87E-02 2.18E-02 -2.47E-02 5.15E-03 3.12E-03 -4.10E-04 -1.13E-03 S2 9.34E+00 -4.19E-02 8.41E-03 4.64E-03 -8.57E-04 -5.71E-03 2.53E-03 -3.29E-04 S3 2.29E+01 -5.57E-02 2.03E-02 1.48E-02 1.74E-02 -5.73E-02 4.21E-02 -9.46E-03 S4 1.24E+01 -1.48E-02 9.45E-03 4.38E-03 6.43E-03 5.27E-03 -1.91E-02 8.15E-03 S5 -9.77E+01 -6.16E-03 -1.25E-01 3.91E-02 1.20E-03 -2.36E-02 5.32E-04 -1.81E-02 S6 1.81E+01 1.83E-02 -1.07E-01 -4.86E-02 4.33E-02 7.63E-03 -9.77E-03 -4.00E-03 S7 1.08E+01 8.85E-03 -5.61E-02 -2.25E-02 5.79E-03 2.67E-02 5.30E-03 -6.85E-03 S8 3.64E+01 -8.48E-02 3.28E-02 -2.23E-02 5.53E-07 4.50E-03 7.69E-04 -5.67E-04 S9 -3.88E+01 -1.14E-01 3.27E-02 -1.49E-02 -4.48E-04 1.41E-04 -8.53E-04 4.09E-04 S10 -2.66E+00 -4.61E-02 6.13E-03 3.93E-03 -4.86E-05 -1.42E-04 -1.12E-05 8.50E-07 S11 -9.75E-01 3.36E-02 5.03E-03 -2.91E-04 -5.24E-05 1.15E-05 -6.90E-06 8.12E-07 S12 -1.00E+02 -1.20E-02 -4.32E-04 1.25E-04 -5.96E-05 3.03E-07 6.14E-07 -4.08E-08

[0113] In this embodiment, the astigmatism curve, f-tan(θ) 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.

[0114] from Figure 7 As can be seen, the astigmatism of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens 200 can effectively correct astigmatism.

[0115] from Figure 8 As can be seen, the f-tan(θ) distortion of the optical lens is controlled within ±1.5%, indicating that the distortion of the optical lens 200 has been well corrected.

[0116] from Figure 9 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens 200 can correct axial aberration well.

[0117] from Figure 10 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 200 can correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane very well.

[0118] Example 3

[0119] 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 optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0120] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0121] Table 3-1

[0122]

[0123] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0124] Table 3-2

[0125]

[0126]

[0127] In this embodiment, the astigmatism curve, f-tan(θ) 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.

[0128] from Figure 12 As can be seen, the astigmatism of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens 300 can effectively correct astigmatism.

[0129] from Figure 13 As can be seen, the f-tan(θ) distortion of the optical lens is controlled within ±1.5%, indicating that the distortion of the optical lens 300 has been well corrected.

[0130] from Figure 14 As can be seen, the axial aberration offset is controlled within ±0.03mm, indicating that the optical lens 300 can correct axial aberration well.

[0131] from Figure 15 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 300 can correct the chromatic aberration at the edge of the field of view and the secondary spectrum of the entire image plane very well.

[0132] 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, principal ray incident angle CRA at the maximum image height, 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.

[0133] Table 4

[0134]

[0135]

[0136] 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, high pixel count, and high imaging quality.

[0137] 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.

[0138] 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, six pieces of lenses in total, characterized in that, In order from the object side to the imaging surface along the optical axis, the optical lens comprises in sequence: a first lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a second lens with negative refractive power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface; a third lens with positive refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fourth lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a fifth lens with positive refractive power, the image side surface of which is a convex surface at the near optical axis, and the image side surface of which is a convex surface; a sixth lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface at the near optical axis; wherein the focal length f1 of the first lens, the object side surface curvature radius R1 of the first lens, and the image side surface curvature radius R2 of the first lens satisfy: 1.1 < (R2-R1) / f1 < 1.4; the central thickness CT5 of the fifth lens and the edge thickness ET5 of the fifth lens satisfy: 2.2 < CT5 / ET5 < 2.7; the central thickness CT6 of the sixth lens and the edge thickness ET6 of the sixth lens satisfy: 1 < ET6 / CT6 < 2.

2. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the combined focal length f34 of the third lens and the fourth lens satisfy: -14 < f34 / f < -5.

3. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens satisfy: -1.7 < f456 / f < -1.

1.

4. The optical lens of claim 1, wherein, the combined focal length f123 of the first lens, the second lens and the third lens, the central thickness CT1 of the first lens, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 2.3 < f123 / (CT1+CT2+CT3) < 2.

9.

5. The optical lens of claim 1, wherein, the effective focal length f of the optical lens, the real image height IH corresponding to the maximum field of view, and the back focal length BFL of the optical lens satisfy: 0.7 < IH×BFL / f < 0.

9.

6. The optical lens of claim 1, wherein, the distance AT3 on the optical axis between the third lens and the fourth lens, the distance AT4 on the optical axis between the fourth lens and the fifth lens, and the distance AT5 on the optical axis between the fifth lens and the sixth lens satisfy: 0.1 < AT3 / (AT4+AT5) < 0.

3.

7. The optical lens of claim 1, wherein, the combined focal length f34 of the third lens and the fourth lens and the back focal length BFL of the optical lens satisfy: -60 < f34 / BFL < -25.

8. The optical lens of claim 1, wherein, the sum ∑CT of the central thicknesses of the first lens to the sixth lens and the sum ∑AT of the distances on the optical axis between any two adjacent lenses in the first lens to the sixth lens satisfy: 2.3 < ∑CT / ∑AT < 2.

8.

9. The optical lens of claim 1, wherein, the focal length f4 of the fourth lens, the object side surface curvature radius R41 of the fourth lens, and the image side surface curvature radius R42 of the fourth lens satisfy: 2 < (R41+R42) / f4 < 3.

5.

10. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: -6.5 < f2 / f < -3.

Images