Optical lens assembly, imaging device and electronic device

Abstract

The present application discloses an optical lens assembly, an imaging device, and an electronic device. The optical lens assembly includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the first lens has positive optical power, and its object side surface is convex at the optical axis; the second to fifth lenses all have optical power, wherein the object side surface of the third lens is convex at the optical axis, and the image side surface is concave at the optical axis; the object side surface of the fifth lens is convex at the optical axis, and the image side surface is concave at the optical axis; the sixth lens has negative optical power, its object side surface is convex at the optical axis, and its image side surface is concave at the optical axis; at least one of the object side surface and the image side surface of the sixth lens includes at least one inflection point; the aperture number FNO of the optical lens assembly satisfies FNO≤1.8; the combined focal length f123 of the first lens, the second lens, and the third lens and the combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens satisfy ‑1<f123 / f456<0.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an optical lens assembly, an imaging device and an electronic device. Background Art

[0002] In recent years, with the advancement of technology, portable electronic devices with camera functions have become increasingly popular. Advances in semiconductor processing technology have enabled the pixel size of photosensitive elements such as CMOS chips to become increasingly smaller. Coupled with the current trend of electronic products pursuing high functionality and slim, lightweight designs, miniaturized lenses with excellent imaging quality have become a mainstream feature in the market.

[0003] In order to ensure image quality, traditional optical lenses are usually large in size and long in total length, making them difficult to be installed on ultra-thin electronic products. In addition, traditional optical lenses have weak adaptability to low-light scenes, and the resulting captured images are darker, which cannot meet users' professional shooting needs. Summary of the Invention

[0004] Based on this, it is necessary to provide an improved optical lens group to address the problems that traditional optical lenses are long in total length and difficult to adapt to dark light scenes while ensuring imaging quality.

[0005] An optical lens assembly comprises, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein the first lens has positive refractive power, and its object-side surface is convex at the optical axis; the second lens has refractive power; the third lens has refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; the fourth lens has refractive power; the fifth lens has refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; the sixth lens has negative refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; at least one of the object-side surface and the image-side surface of the sixth lens includes at least one inflection point; the optical lens assembly satisfies the following relationship:

[0006] FNO≤1.8;

[0007] -1<f123 / f456<0;

[0008] Wherein, FNO is the aperture number of the optical lens group, f123 is the combined focal length of the first lens, the second lens and the third lens, and f456 is the combined focal length of the fourth lens, the fifth lens and the sixth lens.

[0009] The above-mentioned optical lens group, by reasonably allocating the optical power, surface shape and effective focal length of each lens, can effectively increase the aperture of the optical lens group while ensuring the imaging quality of the optical lens group, thereby enhancing the low-light shooting capability of the optical lens group and improving the image quality; at the same time, by controlling the combined focal length of the first lens, the second lens and the third lens and the combined focal length of the fourth lens, the fifth lens and the sixth lens to meet the above-mentioned relationship, the spherical aberration generated by the first lens, the second lens and the third lens can be effectively corrected, the field curvature and distortion of the optical lens group can be reduced, and the resolving power of the optical lens group can be improved.

[0010] In one embodiment, both the object-side surface and the image-side surface of the sixth lens are aspherical surfaces.

[0011] By setting the object-side surface and the image-side surface of the sixth lens to be aspherical, the aberration can be effectively corrected and the imaging resolution of the optical lens group can be improved.

[0012] In one embodiment, the optical lens group satisfies the following relationship: TTL / ImgH≤1.7; wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens group on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical lens group.

[0013] By controlling the distance between the object side surface of the first lens and the imaging surface of the optical lens group on the optical axis and half of the diagonal length of the effective pixel area on the imaging surface of the optical lens group to satisfy the above relationship, the total length of the optical lens group can be effectively shortened, achieving miniaturization and ultra-thinness.

[0014] In one embodiment, the optical lens assembly satisfies the following relationship: EPD / TTL>0.45; wherein EPD is the entrance pupil diameter of the optical lens assembly, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens assembly on the optical axis.

[0015] By controlling the entrance pupil diameter of the optical lens group and the distance from the object side surface of the first lens to the imaging surface of the optical lens group on the optical axis to satisfy the above relationship, the optical lens group can have a larger light-clearance while effectively shortening the total length of the optical lens group, thereby achieving miniaturization and ultra-thinness of the lens.

[0016] In one embodiment, the optical lens assembly satisfies the following relationship: 0.3<R5 / R6<3.5; wherein R5 is the curvature radius of the object side of the third lens at the optical axis, and R6 is the curvature radius of the image side of the third lens at the optical axis.

[0017] By controlling the curvature radius of the object side of the third lens at the optical axis and the curvature radius of the image side of the third lens at the optical axis to satisfy the above relationship, the third lens can be designed as a meniscus lens with the convex surface facing the object side, thereby achieving good compensation for the spherical aberration and astigmatism of the optical lens group and ensuring the imaging quality of the lens.

[0018] In one embodiment, the optical lens assembly satisfies the following relationship: 1<R9 / f+R10 / f<2; wherein R9 is the radius of curvature of the object side of the fifth lens at the optical axis, R10 is the radius of curvature of the image side of the fifth lens at the optical axis, and f is the effective focal length of the optical lens assembly.

[0019] By controlling the radius of curvature of the object side of the fifth lens at the optical axis, the radius of curvature of the image side of the fifth lens at the optical axis, and the effective focal length of the optical lens group to satisfy the above relationship, the shape of the fifth lens can be reasonably optimized, which is beneficial to further correct the aberrations and field curvature of the optical lens group and improve the imaging quality.

[0020] In one embodiment, the optical lens assembly satisfies the following relationship: MAX(cra)≤38.5°; wherein MAX(cra) is the maximum incident angle of the principal ray on the imaging plane of the optical lens assembly.

[0021] By controlling the maximum incident angle of the principal ray on the imaging plane of the optical lens group to satisfy the above relationship, the increase in the incident angle of the principal ray in the off-axis field of view can be effectively suppressed, thereby more accurately matching the ultra-high pixel photosensitive element and improving the light energy receiving efficiency of the photosensitive element.

[0022] In one embodiment, the optical lens assembly satisfies the following relationship: f1 / OAL>0.7; wherein f1 is the effective focal length of the first lens, and OAL is the distance from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis.

[0023] By controlling the effective focal length of the first lens and the distance from the object-side surface of the first lens to the image-side surface of the sixth lens on the optical axis to satisfy the above-mentioned relationship, the first lens can have a sufficiently positive focal power, thereby facilitating compression of the total length of the optical lens group and achieving miniaturization of the lens. If the ratio of the two is less than or equal to 0.7, the refractive power of the first lens will be reduced or the total length of the optical lens group will not be sufficiently compressed, which is not conducive to miniaturization of the lens.

[0024] In one embodiment, the optical lens assembly satisfies the following relationship: 0.3<T34 / P<0.5; wherein T34 is the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens, and P is the distance on the optical axis from the object side surface of the third lens to the image side surface of the fourth lens.

[0025] By controlling the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens and the distance on the optical axis from the object side surface of the third lens to the image side surface of the fourth lens to satisfy the above relationship, the air gap between the third lens and the fourth lens is optimized, providing sufficient space for adjusting the surface profiles of the image side surface of the third lens and the object side surface of the fourth lens. If the ratio of the two is less than or equal to 0.3, the third lens and the fourth lens will be too compact, which is not conducive to flexible adjustment of the surface profiles of the two. If the ratio of the two is greater than or equal to 0.5, the third lens and the fourth lens will be too dispersed, which is not conducive to miniaturization and ultra-thinness of the lens.

[0026] In one embodiment, the optical lens assembly satisfies the following relationship:

[0027] MIN(T56) / MAX(T56)<0.54; wherein MIN(T56) is the minimum distance between the image side surface of the fifth lens and the object side surface of the sixth lens in a direction parallel to the optical axis, and MAX(T56) is the maximum distance between the image side surface of the fifth lens and the object side surface of the sixth lens in a direction parallel to the optical axis.

[0028] By controlling the minimum distance between the image-side surface of the fifth lens and the object-side surface of the sixth lens in a direction parallel to the optical axis and the maximum distance between the image-side surface of the fifth lens and the object-side surface of the sixth lens in a direction parallel to the optical axis to satisfy the above relationship, the concave and convex aspects of the fifth lens and the sixth lens can be made in the same direction, and the configuration is more compact, which is more conducive to miniaturization of the optical lens assembly.

[0029] In one embodiment, the optical lens assembly satisfies the following relationship:

[0030] |f1 / CT1|+|f2 / CT2|+|f3 / CT3|+|f4 / CT4|+|f5 / CT5|+|f6 / CT6|>141; wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

[0031] By controlling the effective focal length of each lens and the thickness of each lens on the optical axis to satisfy the above relationship, the optical focal length and center thickness of each lens can be reasonably optimized, thereby effectively shortening the total length of the optical lens group while ensuring the imaging quality of the optical lens group, thereby achieving miniaturization of the lens.

[0032] The present application also provides an imaging device.

[0033] An imaging device comprises the above-mentioned optical lens group; and a photosensitive element, wherein the photosensitive element is arranged on the image side of the optical lens group.

[0034] The above-mentioned imaging device can capture clear and bright images even in low-light conditions by utilizing the above-mentioned optical lens group. At the same time, the imaging device is also miniaturized, which makes it easy to adapt to devices with limited size, such as thin and light electronic devices.

[0035] The present application also provides an electronic device.

[0036] An electronic device comprises a housing and the imaging device as described above, wherein the imaging device is mounted on the housing.

[0037] The above-mentioned electronic device has a light and thin structure. By using the imaging device as described above, bright images with good blur effect and high definition can be captured, which can meet the user's multi-scene and professional shooting needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic structural diagram of an optical lens assembly according to Example 1 of the present application is shown;

[0039] Figures 2A to 2D The longitudinal spherical aberration curve, astigmatism curve, distortion curve, and principal ray incident angle curve on the imaging plane of the optical lens assembly of Example 1 are shown respectively;

[0040] Figure 3 Schematic diagram of the structure of the optical lens assembly of Example 2 of the present application is shown;

[0041] Figures 4A to 4D They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, a distortion curve diagram, and a chief ray incident angle curve diagram on the imaging plane of the optical lens assembly of Example 2;

[0042] Figure 5 Schematic diagram of the structure of the optical lens assembly of Example 3 of the present application is shown;

[0043] 6A to 6D They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, a distortion curve diagram, and a principal ray incident angle curve diagram on the imaging plane of the optical lens assembly of Example 3;

[0044] Figure 7 Schematic diagram of the structure of the optical lens assembly of Example 4 of the present application is shown;

[0045] Figures 8A to 8D Graphs showing the longitudinal spherical aberration, astigmatism, distortion, and incident angle of the principal ray on the imaging plane of the optical lens assembly of Example 4;

[0046] Figure 9 Schematic diagram of the structure of the optical lens assembly of Example 5 of the present application is shown;

[0047] 10A to 10D They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, a distortion curve diagram, and a principal ray incident angle curve diagram on the imaging plane of the optical lens assembly of Example 5;

[0048] Figure 11 Schematic diagram of the structure of the optical lens assembly of Example 6 of the present application is shown;

[0049] 12A to 12D They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, a distortion curve diagram, and a principal ray incident angle curve diagram on the imaging plane of the optical lens assembly of Example 6;

[0050] Figure 13 Schematic diagram of the structure of the optical lens assembly of Example 7 of the present application is shown;

[0051] 14A to 14D They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, a distortion curve diagram and a principal ray incident angle curve diagram on the imaging plane of the optical lens group of Example 7. DETAILED DESCRIPTION

[0052] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0053] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear", "circumferential" and similar expressions used herein are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0054] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0055] For ease of explanation, the shapes of spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0057] While traditional six-piece optical lens groups ensure image quality, the total length of the lens group is usually relatively long, so lenses equipped with this lens group cannot be installed on ultra-thin electronic products. In addition, traditional six-piece optical lens groups often have a small aperture and weak low-light shooting capabilities, making it difficult to capture brighter images.

[0058] The defects in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed in the embodiments of this application below should be the contributions made by the inventor to this application during the application process.

[0059] The features, principles and other aspects of the present application will be described in detail below.

[0060] Please also refer to Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 、 Figure 11 and Figure 13 The present invention provides an optical lens assembly with a large aperture, high imaging quality, and the ability to meet the requirements of miniaturization and ultra-thin applications. The optical lens assembly includes six lenses having optical power, namely, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, and an imaging surface located on the image side of the sixth lens. The six lenses are arranged in sequence along the optical axis from the object side to the image side.

[0061] The first lens has positive optical power and primarily focuses light. The object-side surface of the first lens is convex at the optical axis, which facilitates adjustment of the shape and optical power of the first lens, thereby balancing the curvature configuration of the two surfaces of the first lens.

[0062] The second lens has optical power. When the second lens has positive optical power, it can cooperate with the first lens to further shorten the total length of the lens. When it has negative optical power, it can correct part of the aberration produced by the first lens, so that the system has a higher resolution.

[0063] The third lens has optical power, and the object side surface of the third lens is convex at the optical axis, and the image side surface is concave at the optical axis, which is beneficial to correcting the aberrations generated by the first and second lenses and improving imaging quality.

[0064] The fourth lens has optical power, and the image-side surface of the fourth lens is convex at the off-axis position, thereby facilitating reduction of distortion of the off-axis field of view, avoiding imaging distortion, and also facilitating correction of aberrations.

[0065] The fifth lens element has optical power, and the object-side surface of the fifth lens element is convex at the optical axis, and the image-side surface is concave at the optical axis, which is conducive to further correcting aberrations. At the same time, the image-side surface of the fifth lens element is convex at the off-axis position, which is conducive to cooperating with the sixth lens element to reduce the incident angle of the main light in the off-axis field of view, thereby improving the compatibility with traditional photosensitive elements.

[0066] The sixth lens element may have a negative optical power, thereby shortening the back focal length of the lens group, which is beneficial for placing a lens equipped with the optical lens group of the present application in an ultra-thin electronic device; at the same time, the object-side surface of the sixth lens element is a convex surface at the optical axis, which is beneficial for adjusting the shape and optical focal length of the sixth lens to further correct aberrations; the image-side surface of the sixth lens element is a concave surface at the optical axis, thereby configuring a suitable back focal length for the optical lens group to achieve miniaturization of the lens; at least one surface of the object-side surface and the image-side surface of the sixth lens includes at least one inflection point to effectively suppress the angle of off-axis field of view light incident on the photosensitive element, so that it more accurately matches the photosensitive element, thereby improving the light energy receiving efficiency of the photosensitive element.

[0067] Specifically, the optical lens group satisfies the following relationship: FNO ≤ 1.8; where FNO is the aperture number of the optical lens group. FNO can be 1.4, 1.5, 1.6, 1.7, or 1.8. By controlling the aperture number of the optical lens group to meet the above relationship, the optical lens group can have a larger entrance pupil diameter while ensuring the miniaturization of the optical lens group, thereby increasing the amount of light entering and obtaining a clearer and brighter image to meet the shooting requirements of low-light scenes such as night scenes and starry skies. In addition, the smaller the FNO, the better the blur effect of the optical lens group, which can bring a better visual experience to the user.

[0068] Specifically, the optical lens assembly satisfies the following relationship: -1<f123 / f456<0; where f123 is the combined focal length of the first, second, and third lenses, and f456 is the combined focal length of the fourth, fifth, and sixth lenses. f123 / f456 can be -0.95, -0.65, -0.35, -0.25, -0.20, -0.15, -0.10, or -0.05. Under the condition that the above relationship is satisfied, the first, second, and third lenses can provide sufficient positive focal power to better converge light, while the fourth, fifth, and sixth lenses can provide appropriate negative focal power to correct the spherical aberration generated by the first, second, and third lenses, reduce the field curvature and distortion of the optical lens assembly, and improve the resolving power of the optical lens assembly.

[0069] When the above optical lens group is used for imaging, the light emitted or reflected by the subject enters the optical lens group from the object side, passes through the first lens, second lens, third lens, fourth lens, fifth lens and sixth lens in sequence, and finally converges on the imaging surface.

[0070] The above-mentioned optical lens group can effectively increase the aperture of the optical lens group while ensuring the imaging quality of the optical lens group by reasonably allocating the optical power, surface shape and effective focal length of each lens, thereby enhancing the low-light shooting capability of the optical lens group and improving the shooting image quality.

[0071] In an exemplary embodiment, both the object-side surface and the image-side surface of the sixth lens are configured as aspherical surfaces. By configuring both the object-side surface and the image-side surface of the sixth lens as aspherical surfaces, aberrations can be effectively corrected and the imaging resolution of the optical lens assembly can be improved.

[0072] In an exemplary embodiment, the optical lens assembly satisfies the following relationship: TTL / ImgH≤1.7; wherein TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical lens assembly, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical lens assembly. TTL / ImgH can be 1.378, 1.428, 1.458, 1.488, 1.518, 1.548, 1.578, or 1.608. Under the condition that the above relationship is satisfied, the total length of the optical lens assembly can be effectively shortened, achieving miniaturization and ultra-thinness of the lens. At the same time, when the total length of the optical lens assembly is determined, the larger the diagonal distance of the effective pixel area, the wider the optical lens assembly has, and the smaller the diagonal distance of the effective pixel area, the more telephoto the optical lens assembly has.

[0073] In an exemplary embodiment, the optical lens assembly satisfies the following relationship: EPD / TTL > 0.45, where EPD is the entrance pupil diameter of the optical lens assembly, and TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical lens assembly. EPD / TTL can be 0.451, 0.455, 0.459, 0.464, 0.484, 0.504, 0.524, 0.544, 0.564, or 0.584. When this relationship is satisfied, the optical lens assembly can maintain a larger clear aperture while effectively shortening its overall length, thereby achieving miniaturization and ultra-thinness.

[0074] In an exemplary embodiment, the optical lens assembly satisfies the following relationship: 0.3 < R5 / R6 < 3.5; where R5 is the radius of curvature of the object-side surface of the third lens at the optical axis, and R6 is the radius of curvature of the image-side surface of the third lens at the optical axis. R5 / R6 can be 0.328, 0.348, 0.368, 0.768, 1.168, 1.568, 2.068, 2.568, 3.068, or 3.368. Under the condition that the above relationship is satisfied, the third lens can be designed as a meniscus lens with the convex surface facing the object side, thereby effectively compensating for spherical aberration and astigmatism of the optical lens assembly, ensuring image quality.

[0075] In an exemplary embodiment, the optical lens assembly satisfies the following relationship: 1 < R9 / f + R10 / f < 2; where R9 is the radius of curvature of the object-side surface of the fifth lens element at the optical axis, R10 is the radius of curvature of the image-side surface of the fifth lens element at the optical axis, and f is the effective focal length of the optical lens assembly. (R9 / f + R10 / f) can be 1.437, 1.487, 1.537, 1.587, 1.637, 1.687, 1.737, 1.787, 1.837, 1.887, 1.937, 1.987, or 1.996. Under the condition that the above relationship is satisfied, the shape of the fifth lens element can be reasonably optimized to further correct the aberrations and field curvature of the optical lens assembly and improve imaging quality.

[0076] In an exemplary embodiment, the optical lens assembly satisfies the following relationship: MAX(cra) ≤ 38.5°, where MAX(cra) is the maximum incident angle of the principal ray on the imaging plane of the optical lens assembly. MAX(cra) can be 31.5°, 32.5°, 33.5°, 34.5°, 35.5°, 36.5°, 37.5°, or 38.5°. When this relationship is satisfied, the increase in the principal ray incident angle in the off-axis field of view can be effectively suppressed, allowing the principal ray to more accurately match the ultra-high-pixel resolution photosensitive element, thereby improving the photosensitive element's light energy reception efficiency.

[0077] In an exemplary embodiment, the optical lens assembly satisfies the following relationship: f1 / OAL>0.7; wherein f1 is the effective focal length of the first lens, and OAL is the distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens. f1 / OAL can be 0.743, 0.943, 1.143, 1.343, 1.543, 1.743, 1.943, or 2.143. When the above relationship is satisfied, the first lens can have a sufficiently positive focal power, which is conducive to compressing the total length of the optical lens assembly and achieving miniaturization of the lens. If the ratio of the two is less than or equal to 0.7, the refractive power of the first lens will be reduced or the total length of the optical lens assembly will not be sufficiently compressed, which is not conducive to miniaturization of the lens.

[0078] In an exemplary embodiment, the optical lens assembly satisfies the following relationship: 0.3<T34 / P<0.5; wherein T34 is the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens, and P is the distance on the optical axis from the object side surface of the third lens to the image side surface of the fourth lens. T34 / P can be 0.333, 0.343, 0.353, 0.363, 0.373, 0.383, 0.393, 0.403, 0.413, 0.423, or 0.433. Under the condition that the above relationship is satisfied, the air gap between the third lens and the fourth lens can be optimized to provide sufficient space for adjusting the surface shape of the image side surface of the third lens and the object side surface of the fourth lens. At the same time, if the ratio of the two is less than or equal to 0.3, the third lens and the fourth lens will be too compact, which is not conducive to the flexible adjustment of their surface shapes. If the ratio of the two is greater than or equal to 0.5, the third lens and the fourth lens will be too dispersed, which is not conducive to the miniaturization and ultra-thinness of the lens.

[0079] In an exemplary embodiment, the optical lens assembly satisfies the following relationship:

[0080] MIN(T56) / MAX(T56)<0.54; where MIN(T56) is the minimum distance from the image-side surface of the fifth lens element to the object-side surface of the sixth lens element in a direction parallel to the optical axis, and MAX(T56) is the maximum distance from the image-side surface of the fifth lens element to the object-side surface of the sixth lens element in a direction parallel to the optical axis. MIN(T56) / MAX(T56) can be 0.063, 0.093, 0.153, 0.253, 0.303, 0.353, 0.403, 0.453, 0.503, or 0.534. When the above relationship is satisfied, the concave and convex portions of the fifth and sixth lenses can be oriented in the same direction, resulting in a more compact configuration and further facilitating miniaturization of the optical lens assembly.

[0081] In an exemplary embodiment, the optical lens assembly satisfies the following relationship:

[0082] |f1 / CT1|+|f2 / CT2|+|f3 / CT3|+|f4 / CT4|+|f5 / CT5|+|f6 / CT6|>141; where f1, f2, f3, f4, f5, and f6 are the effective focal lengths of the first, second, third, fourth, fifth, and sixth lenses, respectively, and CT1, CT2, CT3, CT4, CT5, and CT6 are the thicknesses of the first, second, third, fourth, fifth, and sixth lenses on the optical axis, respectively. By controlling the effective focal length and thickness of each lens on the optical axis to satisfy the above relationship, the focal power and center thickness of each lens can be rationally optimized. This ensures that the overall length of the optical lens assembly is shortened while maintaining imaging quality, achieving miniaturization of the lens system.

[0083] In an exemplary embodiment, the optical lens assembly is further provided with an aperture stop. The aperture stop can be positioned between the object side of the optical lens assembly and the first lens element, or between the first lens element and the sixth lens element. Preferably, the aperture stop is positioned between the object side of the optical lens assembly and the first lens element to effectively prevent excessive increases in the incident angle of the principal ray, thereby enabling the optical lens assembly to better match conventional photosensitive elements.

[0084] In other embodiments, the aperture stop may also be located on the surface of any lens from the first lens to the sixth lens (for example, the object side surface and the image side surface), forming an interactive relationship with the lens, for example, by coating a light-blocking coating on the surface of the lens to form an aperture stop on the surface; or by fixing the surface of the lens with a clamping member, the clamping member structure located on the surface can limit the width of the imaging light beam of the on-axis object point, thereby forming an aperture stop on the surface.

[0085] In an exemplary embodiment, the lens surfaces of each of the first to sixth lenses are aspherical, thereby increasing the flexibility of lens design, effectively correcting aberrations, and improving the imaging resolution of the optical lens assembly. In other embodiments, the object-side and image-side surfaces of each lens in the optical lens assembly may also be spherical. It should be noted that the above embodiments are merely illustrative of some embodiments of the present application. In some embodiments, the surfaces of each lens in the optical lens assembly may be any combination of aspherical and spherical surfaces.

[0086] In an exemplary embodiment, the materials of each lens in the optical lens assembly can be either all glass or all plastic. Plastic lenses can reduce the weight of the optical lens assembly and lower production costs, while glass lenses can provide the optical lens assembly with excellent optical performance and high temperature resistance. It should be noted that the materials of each lens in the optical lens assembly can also be any combination of glass and plastic, and do not necessarily have to be all glass or all plastic.

[0087] In an exemplary embodiment, the optical lens assembly further includes a filter for filtering out infrared light and / or a protective glass for protecting a photosensitive element, wherein the photosensitive element is located on the imaging surface of the optical lens assembly. Further, the imaging surface can be the photosensitive surface of the photosensitive element.

[0088] The optical lens assembly of the above-mentioned embodiment of the present application can use multiple lenses, such as the six lenses described above. By reasonably allocating the focal length, optical power, surface shape, thickness of each lens, and the on-axis spacing between each lens, it is possible to ensure that the total length of the above-mentioned optical lens assembly is small and has an ultra-large aperture (FNO can be 1.4), while also having high imaging quality, thereby better meeting the adaptation requirements and low-light shooting requirements of thin and light electronic devices such as mobile phones and tablets. It is understandable that although six lenses are used as an example in the embodiment, the optical lens assembly is not limited to including six lenses. If necessary, the optical lens assembly can also include other numbers of lenses.

[0089] Specific embodiments of the optical lens assembly applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0090] Example 1

[0091] The following reference Figures 1 to 2D The optical lens assembly of Example 1 of the present application is described.

[0092] Figure 1 FIG. 1 shows a schematic structural diagram of the optical lens assembly of Example 1. Figure 1 As shown, the optical lens group includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and an imaging surface S15.

[0093] The first lens L1 has positive refractive power. Its object-side surface S1 is convex at the optical axis and convex at the circumference, and its image-side surface S2 is concave at the optical axis and concave at the circumference.

[0094] The second lens L2 has positive refractive power. Its object-side surface S3 is convex at the optical axis and at the circumference. Its image-side surface S4 is convex at the optical axis and at the circumference.

[0095] The third lens L3 has negative refractive power. Its object-side surface S5 is convex at the optical axis and convex at the circumference, and its image-side surface S6 is concave at the optical axis and concave at the circumference.

[0096] The fourth lens L4 has negative refractive power. Its object-side surface S7 is concave at the optical axis and at the circumference, and its image-side surface S8 is convex at the optical axis and at the circumference.

[0097] The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex at the optical axis and concave at the circumference. Its image-side surface S10 is concave at the optical axis and convex at the circumference.

[0098] The sixth lens L6 has negative refractive power. Its object-side surface S11 is convex at the optical axis and concave at the circumference. Its image-side surface S12 is concave at the optical axis and convex at the circumference.

[0099] The object-side and image-side surfaces of each lens from the first lens L1 to the sixth lens L6 are all aspherical surfaces. The aspherical design can solve the problem of field of view distortion and also enable the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the optical lens assembly miniaturized.

[0100] The first lens L1 to the sixth lens L6 are all made of plastic. Plastic lenses can reduce the weight of the optical lens assembly and reduce production costs.

[0101] An aperture STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens assembly.

[0102] The optical lens assembly also includes a filter L7 having an object-side surface S13 and an image-side surface S14. Light from the object OBJ sequentially passes through each surface S1 to S14 and is ultimately imaged on the imaging surface S15. Furthermore, the filter L7 is an infrared filter that is used to filter out infrared light from external light incident on the optical lens assembly to avoid imaging distortion. Specifically, the infrared filter L7 is made of glass. The infrared filter L7 can be part of the optical lens assembly and assembled together with each lens, or it can be installed together when the optical lens assembly and the photosensitive element are assembled.

[0103] Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens in the optical lens assembly of Example 1. The units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Taking first lens L1 as an example, the first value in the "Thickness" parameter column for first lens L1 is the thickness of the lens along the optical axis, and the second value is the distance from the image side surface of the lens to the object side surface of the next lens in the image direction along the optical axis. The reference wavelength in Table 1 is 555 nm.

[0104] Table 1

[0105]

[0106] The aspheric surface shape of each lens is defined by the following formula:

[0107]

[0108] Where x is the distance vector from the vertex of the aspheric surface at a height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the conic coefficient; and Ai is the i-th order coefficient of the aspheric surface. Table 2 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric surfaces S1-S12 of the lens in Example 1.

[0109] Table 2

[0110]

[0111] The half of the diagonal length ImgH of the effective pixel area on the imaging surface S15 of the optical lens assembly of this embodiment is 3.4 mm. Therefore, combining the data in Table 1 and Table 2, it can be seen that the optical lens assembly in Example 1 satisfies:

[0112] FNO=1.8, where FNO is the aperture number of the optical lens group;

[0113] f123 / f456=-0.198, where f123 is the combined focal length of the first lens L1, the second lens L2, and the third lens L3, and f456 is the combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6;

[0114] TTL / ImgH=1.422, where TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S15 of the optical lens assembly, and ImgH is half the diagonal length of the effective pixel area on the imaging surface S15 of the optical lens assembly;

[0115] EPD / TTL=0.461, where EPD is the entrance pupil diameter of the optical lens assembly, and TTL is the distance on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S15 of the optical lens assembly;

[0116] R5 / R6=2.876, where R5 is the radius of curvature of the object-side surface S5 of the third lens element L3 at the optical axis, and R6 is the radius of curvature of the image-side surface S6 of the third lens element L3 at the optical axis;

[0117] R9 / f+R10 / f=1.604, where R9 is the radius of curvature of the object-side surface S9 of the fifth lens element L5 at the optical axis, R10 is the radius of curvature of the image-side surface S10 of the fifth lens element L5 at the optical axis, and f is the effective focal length of the optical lens assembly;

[0118] MAX(cra)=34.3°, where MAX(cra) is the maximum incident angle of the principal ray on the imaging plane of the optical lens assembly;

[0119] f1 / OAL=1.904, where f1 is the effective focal length of the first lens element L1, and OAL is the distance along the optical axis from the object-side surface S1 of the first lens element L1 to the image-side surface S12 of the sixth lens element L6.

[0120] T34 / P=0.414, where T34 is the distance on the optical axis from the image-side surface S6 of the third lens L3 to the object-side surface S7 of the fourth lens L4, and P is the distance on the optical axis from the object-side surface S5 of the third lens L3 to the image-side surface S8 of the fourth lens L4.

[0121] MIN(T56) / MAX(T56)=0.534, where MIN(T56) is the minimum distance between the image-side surface S10 of the fifth lens element L5 and the object-side surface S11 of the sixth lens element L6 in a direction parallel to the optical axis, and MAX(T56) is the maximum distance between the image-side surface S10 of the fifth lens element L5 and the object-side surface S11 of the sixth lens element L6 in a direction parallel to the optical axis.

[0122] |f1 / CT1|+|f2 / CT2|+|f3 / CT3|+|f4 / CT4|+|f5 / CT5|+|f6 / CT6|=178.109, where f1, f2, f3, f4, f5, and f6 are the effective focal lengths of 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, respectively. CT1, CT2, CT3, CT4, CT5, and CT6 are the thicknesses on the optical axis of 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, respectively.

[0123] Figure 2A The longitudinal spherical aberration curves of the optical lens assembly of Example 1 are shown, which respectively indicate the deviation of the focal point of light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the optical lens assembly; Figure 2B 1 shows an astigmatism curve of the optical lens group of Example 1, which represents meridional field curvature and sagittal field curvature; Figure 2C The figure shows the distortion curve of the optical lens assembly of Example 1, which represents the distortion rate at different image heights. Figure 2D The graph shows the incident angle curve of the chief ray on the image plane S15 of the optical lens composition of Example 1, which represents the angle of the chief ray incident on the photosensitive element under different image heights. Figures 2A to 2D It can be seen that the optical lens assembly provided in Example 1 can achieve good imaging quality.

[0124] Example 2

[0125] The following reference Figures 3 to 4DThe optical lens assembly of Example 2 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 3 A schematic structural diagram of the optical lens assembly of Example 2 of the present application is shown.

[0126] like Figure 3 As shown, the optical lens group includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and an imaging surface S15.

[0127] The first lens L1 has positive refractive power. Its object-side surface S1 is convex at the optical axis and convex at the circumference, and its image-side surface S2 is concave at the optical axis and concave at the circumference.

[0128] The second lens L2 has positive refractive power. Its object-side surface S3 is convex at the optical axis and at the circumference. Its image-side surface S4 is convex at the optical axis and at the circumference.

[0129] The third lens L3 has negative refractive power. Its object-side surface S5 is convex at the optical axis and convex at the circumference, and its image-side surface S6 is concave at the optical axis and concave at the circumference.

[0130] The fourth lens L4 has positive refractive power. Its object-side surface S7 is concave at the optical axis and at the circumference, and its image-side surface S8 is convex at the optical axis and at the circumference.

[0131] The fifth lens L5 has negative refractive power. Its object-side surface S9 is convex at the optical axis and concave at the circumference. Its image-side surface S10 is concave at the optical axis and convex at the circumference.

[0132] The sixth lens L6 has negative refractive power. Its object-side surface S11 is convex at the optical axis and concave at the circumference. Its image-side surface S12 is concave at the optical axis and convex at the circumference.

[0133] The object-side and image-side surfaces of each lens from the first lens L1 to the sixth lens L6 are all aspherical surfaces. The aspherical design can solve the problem of field of view distortion and also enable the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the optical lens assembly miniaturized.

[0134] The first lens L1 to the sixth lens L6 are all made of plastic. Plastic lenses can reduce the weight of the optical lens assembly and reduce production costs.

[0135] An aperture STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens assembly.

[0136] The optical lens assembly also includes a filter L7 having an object-side surface S13 and an image-side surface S14. Light from object OBJ sequentially passes through surfaces S1 to S14 and is ultimately imaged on imaging surface S15. Furthermore, filter L7 is an infrared filter, which is used to remove infrared light from external light incident on the optical lens assembly to prevent image distortion.

[0137] Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., dispersion coefficient), and effective focal length of each lens of the optical lens assembly of Example 2, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 4 shows the higher-order coefficients of the aspheric surfaces S1-S12 of the lenses in Example 2, where the aspheric surface type can be defined by formula (1) given in Example 1. Table 5 shows the numerical values ​​of the relevant parameters of the optical lens assembly given in Example 2. The reference wavelength is 555 nm.

[0138] Table 3

[0139]

[0140] Table 4

[0141]

[0142]

[0143] Table 5

[0144]

[0145] Figure 4A The longitudinal spherical aberration curve of the optical lens assembly of Example 2 is shown, wherein light rays of different wavelengths deviate from the focal point after passing through the optical lens assembly; Figure 4B 10 shows an astigmatism curve of the optical lens group of Example 2, which indicates meridional field curvature and sagittal field curvature; Figure 4C The figure shows the distortion curve of the optical lens assembly of Example 2, which represents the distortion rate at different image heights. Figure 4D The graph shows the incident angle curve of the principal ray on the image plane S15 of the optical lens composition of Example 2, which represents the angle of the principal ray incident on the photosensitive element under different image heights. Figures 4A to 4D It can be seen that the optical lens assembly provided in Example 2 can achieve good imaging quality.

[0146] Example 3

[0147] The following reference Figures 5 to 6D The optical lens assembly of Example 3 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 5A schematic structural diagram of the optical lens assembly of Example 3 of the present application is shown.

[0148] like Figure 5 As shown, the optical lens group includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and an imaging surface S15.

[0149] The first lens L1 has positive refractive power. Its object-side surface S1 is convex at the optical axis and at the circumference. Its image-side surface S2 is convex at the optical axis and at the circumference.

[0150] The second lens L2 has negative refractive power. Its object-side surface S3 is concave at the optical axis and at the circumference, and its image-side surface S4 is convex at the optical axis and at the circumference.

[0151] The third lens L3 has negative refractive power. Its object-side surface S5 is convex at the optical axis and convex at the circumference, and its image-side surface S6 is concave at the optical axis and concave at the circumference.

[0152] The fourth lens L4 has negative refractive power. Its object-side surface S7 is concave at the optical axis and at the circumference, and its image-side surface S8 is convex at the optical axis and at the circumference.

[0153] The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex at the optical axis and concave at the circumference. Its image-side surface S10 is concave at the optical axis and convex at the circumference.

[0154] The sixth lens L6 has negative refractive power. Its object-side surface S11 is convex at the optical axis and convex at the circumference, and its image-side surface S12 is concave at the optical axis and convex at the circumference.

[0155] The object-side and image-side surfaces of each lens from the first lens L1 to the sixth lens L6 are all aspherical surfaces. The aspherical design can solve the problem of field of view distortion and also enable the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the optical lens assembly miniaturized.

[0156] The first lens L1 to the sixth lens L6 are all made of plastic. Plastic lenses can reduce the weight of the optical lens assembly and reduce production costs.

[0157] An aperture STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens assembly.

[0158] The optical lens assembly also includes a filter L7 having an object-side surface S13 and an image-side surface S14. Light from object OBJ sequentially passes through surfaces S1 to S14 and is ultimately imaged on imaging surface S15. Furthermore, filter L7 is an infrared filter, which is used to remove infrared light from external light incident on the optical lens assembly to prevent image distortion.

[0159] Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., dispersion coefficient), and effective focal length of each lens of the optical lens assembly of Example 3, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 7 shows the higher-order coefficients of the aspheric surfaces S1-S12 of the lenses in Example 3, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 8 shows the numerical values ​​of the relevant parameters of the optical lens assembly given in Example 3. The reference wavelength is 555 nm.

[0160] Table 6

[0161]

[0162]

[0163] Table 7

[0164]

[0165] Table 8

[0166]

[0167]

[0168] Figure 6A The longitudinal spherical aberration curve of the optical lens assembly of Example 3 is shown, in which the convergence point of light of different wavelengths after passing through the optical lens assembly deviates; Figure 6B 10 shows an astigmatism curve of the optical lens group of Example 3, which indicates meridional field curvature and sagittal field curvature; Figure 6C The figure shows the distortion curve of the optical lens assembly of Example 3, which represents the distortion rate at different image heights. Figure 6D The graph shows the incident angle curve of the principal ray on the imaging plane S15 of the optical lens composition of Example 3, which represents the angle of the principal ray incident on the photosensitive element under different image heights. 6A to 6D It can be seen that the optical lens assembly provided in Example 3 can achieve good imaging quality.

[0169] Example 4

[0170] The following reference Figures 7 to 8DThe optical lens assembly of Example 4 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 7 A schematic structural diagram of the optical lens assembly of Example 4 of the present application is shown.

[0171] like Figure 7 As shown, the optical lens group includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and an imaging surface S15.

[0172] The first lens L1 has positive refractive power. Its object-side surface S1 is convex at the optical axis and convex at the circumference, and its image-side surface S2 is concave at the optical axis and concave at the circumference.

[0173] The second lens L2 has positive refractive power. Its object-side surface S3 is convex at the optical axis and at the circumference. Its image-side surface S4 is convex at the optical axis and at the circumference.

[0174] The third lens L3 has negative refractive power. Its object-side surface S5 is convex at the optical axis and convex at the circumference, and its image-side surface S6 is concave at the optical axis and concave at the circumference.

[0175] The fourth lens L4 has positive refractive power. Its object-side surface S7 is convex at the optical axis and concave at the circumference, and its image-side surface S8 is concave at the optical axis and convex at the circumference.

[0176] The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex at the optical axis and concave at the circumference. Its image-side surface S10 is concave at the optical axis and convex at the circumference.

[0177] The sixth lens L6 has negative refractive power. Its object-side surface S11 is convex at the optical axis and concave at the circumference. Its image-side surface S12 is concave at the optical axis and convex at the circumference.

[0178] The object-side and image-side surfaces of each lens from the first lens L1 to the sixth lens L6 are all aspherical surfaces. The aspherical design can solve the problem of field of view distortion and also enable the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the optical lens assembly miniaturized.

[0179] The first lens L1 to the sixth lens L6 are all made of plastic. Plastic lenses can reduce the weight of the optical lens assembly and reduce production costs.

[0180] An aperture STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens assembly.

[0181] The optical lens assembly also includes a filter L7 having an object-side surface S13 and an image-side surface S14. Light from object OBJ sequentially passes through surfaces S1 to S14 and is ultimately imaged on imaging surface S15. Furthermore, filter L7 is an infrared filter, which is used to remove infrared light from external light incident on the optical lens assembly to prevent image distortion.

[0182] Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., dispersion coefficient), and effective focal length of each lens of the optical lens assembly of Example 4, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 10 shows the higher-order coefficients of the aspheric surfaces S1-S12 of the lenses in Example 4, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 11 shows the numerical values ​​of the relevant parameters of the optical lens assembly given in Example 4. The reference wavelength is 555 nm.

[0183] Table 9

[0184]

[0185] Table 10

[0186]

[0187]

[0188] Table 11

[0189]

[0190] Figure 8A The longitudinal spherical aberration curve of the optical lens assembly of Example 4 is shown, in which the convergence point of light of different wavelengths after passing through the optical lens assembly deviates; Figure 8B 10 shows an astigmatism curve of the optical lens group of Example 4, which indicates meridional field curvature and sagittal field curvature; Figure 8C The figure shows the distortion curve of the optical lens assembly of Example 4, which represents the distortion rate at different image heights. Figure 8D The graph shows the incident angle curve of the principal ray on the image plane S15 of the optical lens composition of Example 4, which represents the angle of the principal ray incident on the photosensitive element under different image heights. Figures 8A to 8D It can be seen that the optical lens assembly provided in Example 4 can achieve good imaging quality.

[0191] Example 5

[0192] The following reference Figures 9 to 10D The optical lens assembly of Example 5 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 9A schematic structural diagram of the optical lens assembly of Example 5 of the present application is shown.

[0193] like Figure 9 As shown, the optical lens group includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and an imaging surface S15.

[0194] The first lens L1 has positive refractive power. Its object-side surface S1 is convex at the optical axis and convex at the circumference, and its image-side surface S2 is concave at the optical axis and concave at the circumference.

[0195] The second lens L2 has positive refractive power. Its object-side surface S3 is convex at the optical axis and at the circumference. Its image-side surface S4 is convex at the optical axis and at the circumference.

[0196] The third lens L3 has positive refractive power. Its object-side surface S5 is convex at the optical axis and convex at the circumference, and its image-side surface S6 is concave at the optical axis and concave at the circumference.

[0197] The fourth lens L4 has negative refractive power. Its object-side surface S7 is concave at the optical axis and at the circumference, and its image-side surface S8 is convex at the optical axis and at the circumference.

[0198] The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex at the optical axis and concave at the circumference. Its image-side surface S10 is concave at the optical axis and convex at the circumference.

[0199] The sixth lens L6 has negative refractive power. Its object-side surface S11 is convex at the optical axis and concave at the circumference. Its image-side surface S12 is concave at the optical axis and convex at the circumference.

[0200] The object-side and image-side surfaces of each lens from the first lens L1 to the sixth lens L6 are all aspherical surfaces. The aspherical design can solve the problem of field of view distortion and also enable the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the optical lens assembly miniaturized.

[0201] The first lens L1 to the sixth lens L6 are all made of plastic. Plastic lenses can reduce the weight of the optical lens assembly and reduce production costs.

[0202] An aperture STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens assembly.

[0203] The optical lens assembly also includes a filter L7 having an object-side surface S13 and an image-side surface S14. Light from object OBJ sequentially passes through surfaces S1 to S14 and is ultimately imaged on imaging surface S15. Furthermore, filter L7 is an infrared filter, which is used to remove infrared light from external light incident on the optical lens assembly to prevent image distortion.

[0204] Table 12 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens of the optical lens assembly of Example 5, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 13 shows the higher-order coefficients of the aspheric surfaces S1-S12 of the lenses in Example 5, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 14 shows the numerical values ​​of the relevant parameters of the optical lens assembly given in Example 5. The reference wavelength is 555 nm.

[0205] Table 12

[0206]

[0207]

[0208] Table 13

[0209]

[0210] Table 14

[0211]

[0212]

[0213] Figure 10A The longitudinal spherical aberration curve of the optical lens assembly of Example 5 is shown, in which the convergence point of light of different wavelengths after passing through the optical lens assembly deviates; Figure 10B 10 shows an astigmatism curve of the optical lens group of Example 5, which indicates meridional field curvature and sagittal field curvature; Figure 10C The figure shows the distortion curve of the optical lens assembly of Example 5, which represents the distortion rate at different image heights. Figure 10D The graph shows the incident angle curve of the principal ray on the image plane S15 of the optical lens composition of Example 5, which represents the angle of the principal ray incident on the photosensitive element under different image heights. 10A to 10D It can be seen that the optical lens assembly provided in Example 5 can achieve good imaging quality.

[0214] Example 6

[0215] The following reference Figures 11 to 12DThe optical lens assembly of Example 6 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 11 A structural schematic diagram of the optical lens assembly of Example 6 of the present application is shown.

[0216] like Figure 11 As shown, the optical lens group includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and an imaging surface S15.

[0217] The first lens L1 has positive refractive power. Its object-side surface S1 is convex at the optical axis and convex at the circumference, and its image-side surface S2 is concave at the optical axis and concave at the circumference.

[0218] The second lens L2 has positive refractive power. Its object-side surface S3 is convex at the optical axis and at the circumference. Its image-side surface S4 is convex at the optical axis and at the circumference.

[0219] The third lens L3 has negative refractive power. Its object-side surface S5 is convex at the optical axis and convex at the circumference, and its image-side surface S6 is concave at the optical axis and concave at the circumference.

[0220] The fourth lens L4 has positive refractive power. Its object-side surface S7 is convex at the optical axis and concave at the circumference, and its image-side surface S8 is concave at the optical axis and convex at the circumference.

[0221] The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex at the optical axis and concave at the circumference. Its image-side surface S10 is concave at the optical axis and convex at the circumference.

[0222] The sixth lens L6 has negative refractive power. Its object-side surface S11 is convex at the optical axis and concave at the circumference. Its image-side surface S12 is concave at the optical axis and convex at the circumference.

[0223] The object-side and image-side surfaces of each lens from the first lens L1 to the sixth lens L6 are all aspherical surfaces. The aspherical design can solve the problem of field of view distortion and also enable the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the optical lens assembly miniaturized.

[0224] The first lens L1 to the sixth lens L6 are all made of plastic. Plastic lenses can reduce the weight of the optical lens assembly and reduce production costs.

[0225] An aperture STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens assembly.

[0226] The optical lens assembly also includes a filter L7 having an object-side surface S13 and an image-side surface S14. Light from object OBJ sequentially passes through surfaces S1 to S14 and is ultimately imaged on imaging surface S15. Furthermore, filter L7 is an infrared filter, which is used to remove infrared light from external light incident on the optical lens assembly to prevent image distortion.

[0227] Table 15 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens of the optical lens assembly of Example 6, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 16 shows the higher-order coefficients of the aspheric surfaces S1-S12 of the lenses in Example 6, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 17 shows the numerical values ​​of the relevant parameters of the optical lens assembly given in Example 6. The reference wavelength is 555 nm.

[0228] Table 15

[0229]

[0230] Table 16

[0231]

[0232]

[0233] Table 17

[0234]

[0235] Figure 12A The longitudinal spherical aberration curve of the optical lens assembly of Example 6 is shown, in which the convergence point of light of different wavelengths after passing through the optical lens assembly deviates; Figure 12B 10 shows an astigmatism curve of the optical lens group of Example 6, which indicates meridional field curvature and sagittal field curvature; Figure 12C The figure shows the distortion curve of the optical lens assembly of Example 6, which represents the distortion rate at different image heights. Figure 12D The graph shows the incident angle curve of the principal ray on the image plane S15 of the optical lens composition of Example 6, which represents the angle of the principal ray incident on the photosensitive element under different image heights. 12A to 12D It can be seen that the optical lens assembly provided in Example 6 can achieve good imaging quality.

[0236] Example 7

[0237] The following reference Figures 13 to 14D The optical lens assembly of Example 7 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 13A schematic structural diagram of the optical lens assembly of Example 7 of the present application is shown.

[0238] like Figure 13 As shown, the optical lens group includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and an imaging surface S15.

[0239] The first lens L1 has positive refractive power. Its object-side surface S1 is convex at the optical axis and convex at the circumference, and its image-side surface S2 is concave at the optical axis and concave at the circumference.

[0240] The second lens L2 has positive refractive power. Its object-side surface S3 is convex at the optical axis and at the circumference. Its image-side surface S4 is convex at the optical axis and at the circumference.

[0241] The third lens L3 has negative refractive power. Its object-side surface S5 is convex at the optical axis and concave at the circumference. Its image-side surface S6 is concave at the optical axis and concave at the circumference.

[0242] The fourth lens L4 has positive refractive power. Its object-side surface S7 is convex at the optical axis and concave at the circumference, and its image-side surface S8 is convex at the optical axis and convex at the circumference.

[0243] The fifth lens L5 has positive refractive power. Its object-side surface S9 is convex at the optical axis and concave at the circumference. Its image-side surface S10 is concave at the optical axis and convex at the circumference.

[0244] The sixth lens L6 has negative refractive power. Its object-side surface S11 is convex at the optical axis and concave at the circumference. Its image-side surface S12 is concave at the optical axis and convex at the circumference.

[0245] The object-side and image-side surfaces of each lens from the first lens L1 to the sixth lens L6 are all aspherical surfaces. The aspherical design can solve the problem of field of view distortion and also enable the lenses to achieve excellent optical imaging effects while being smaller, thinner, and flatter, thereby making the optical lens assembly miniaturized.

[0246] The first lens L1 to the sixth lens L6 are all made of plastic. Plastic lenses can reduce the weight of the optical lens assembly and reduce production costs.

[0247] An aperture STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical lens assembly.

[0248] The optical lens assembly also includes a filter L7 having an object-side surface S13 and an image-side surface S14. Light from object OBJ sequentially passes through surfaces S1 to S14 and is ultimately imaged on imaging surface S15. Furthermore, filter L7 is an infrared filter, which is used to remove infrared light from external light incident on the optical lens assembly to prevent image distortion.

[0249] Table 18 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens of the optical lens assembly of Example 7, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 19 shows the higher-order coefficients of the aspheric surfaces S1-S12 of the lenses in Example 7, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 20 shows the numerical values ​​of the relevant parameters of the optical lens assembly given in Example 7. The reference wavelength is 555 nm.

[0250] Table 18

[0251]

[0252] Table 19

[0253]

[0254]

[0255] Table 20

[0256]

[0257] Figure 14A The longitudinal spherical aberration curve of the optical lens assembly of Example 7 is shown, in which light rays of different wavelengths deviate from the convergence point after passing through the optical lens assembly; Figure 14B 10 shows an astigmatism curve of the optical lens group of Example 7, which indicates meridional field curvature and sagittal field curvature; Figure 14C The figure shows the distortion curve of the optical lens assembly of Example 7, which represents the distortion rate at different image heights. Figure 14D The graph shows the incident angle curve of the principal ray on the image plane S15 of the optical lens composition of Example 7, which represents the angle of the principal ray incident on the photosensitive element under different image heights. 14A to 14D It can be seen that the optical lens assembly provided in Example 7 can achieve good imaging quality.

[0258] The present application also provides an imaging device, comprising the optical lens assembly described above; and a photosensitive element, the photosensitive element being disposed on the image side of the optical lens assembly to receive light carrying image information formed by the optical system. Specifically, the photosensitive element may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor.

[0259] The above-mentioned imaging device can capture clear and bright images even in low-light conditions by utilizing the above-mentioned optical lens group. At the same time, the imaging device is also miniaturized, which makes it easy to adapt to devices with limited size, such as thin and light electronic devices.

[0260] The present application also provides an electronic device, comprising a housing and an imaging device as described above, wherein the imaging device is mounted on the housing to capture images.

[0261] Specifically, the imaging device is arranged in the shell and exposed from the shell to capture images. The shell can provide the imaging device with dustproof, waterproof and drop-proof protection. A hole corresponding to the imaging device is opened on the shell to allow light to enter or exit the shell through the hole.

[0262] The electronic device has a light and thin structure. By using the imaging device as described above, bright images with good blur effect and high definition can be captured, meeting the user's multi-scene and professional shooting needs.

[0263] The "electronic device" used in the embodiments of the present application may include, but is not limited to, a device configured to receive or send communication signals via a wired line connection and / or via a wireless interface. An electronic device configured to communicate via a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; personal communication system (PCS) terminals that can combine cellular radio telephones with data processing, fax and data communication capabilities; personal digital assistants (PDAs) that can include radiotelephones, pagers, Internet / Intranet access, web browsers, notepads, calendars and / or global positioning system (GPS) receivers; and conventional laptop and / or palmtop receivers or other electronic devices that include radiotelephone transceivers.

[0264] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0265] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An optical lens assembly comprising six lenses having refractive power, comprising, in order from the object side to the image side along the optical axis: The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are characterized in that: The first lens has positive refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; The second lens has positive refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is convex at the optical axis; The third lens has negative refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; The fourth lens has optical power, and its image side surface is convex at the optical axis; The fifth lens has optical power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; The sixth lens has negative optical power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis. At least one of the object-side surface and the image-side surface of the sixth lens includes at least one inflection point. The optical lens assembly satisfies the following relationship: 1.7≤FNO≤1.8; -0.22<f123 / f456<0; Wherein, FNO is the aperture number of the optical lens group, f123 is the combined focal length of the first lens, the second lens and the third lens, and f456 is the combined focal length of the fourth lens, the fifth lens and the sixth lens; The optical lens assembly satisfies the following relationship: 0.3<R5 / R6≤2.876; Wherein, R5 is the curvature radius of the object side of the third lens at the optical axis, and R6 is the curvature radius of the image side of the third lens at the optical axis; 1.485<R9 / f+R10 / f<1.6; Wherein, R9 is the radius of curvature of the object side of the fifth lens at the optical axis, R10 is the radius of curvature of the image side of the fifth lens at the optical axis, and f is the effective focal length of the optical lens assembly; 1.378≤TTL / ImgH≤1.435; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens group on the optical axis, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the optical lens group; 34.1°≤MAX(cra)≤36.9°; Wherein, MAX(cra) is the maximum incident angle of the principal ray on the imaging plane of the optical lens assembly.

2. The optical lens assembly according to claim 1, wherein: The object-side surface and the image-side surface of the sixth lens are both aspherical surfaces.

3. The optical lens assembly according to claim 1, wherein: The optical lens assembly satisfies the following relationship: TTL / ImgH≤1.7; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens group on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical lens group.

4. The optical lens assembly according to claim 1, wherein: The optical lens assembly satisfies the following relationship: 0.465≥EPD / TTL>0.45; Wherein, EPD is the entrance pupil diameter of the optical lens group, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens group on the optical axis.

5. The optical lens assembly according to claim 1, wherein: The optical lens assembly satisfies the following relationship: 2.09≥f1 / OAL≥1.867; Wherein, f1 is the effective focal length of the first lens, and OAL is the distance from the object side surface of the first lens to the image side surface of the sixth lens on the optical axis.

6. The optical lens assembly according to claim 1, wherein: The optical lens assembly satisfies the following relationship: 0.3<T34 / P<0.5; Wherein, T34 is the distance from the image side surface of the third lens to the object side surface of the fourth lens on the optical axis, and P is the distance from the object side surface of the third lens to the image side surface of the fourth lens on the optical axis.

7. The optical lens assembly according to claim 1, wherein: The optical lens assembly satisfies the following relationship: 0.118≤MIN(T56) / MAX(T56)<0.54; Wherein, MIN(T56) is the minimum distance from the image side surface of the fifth lens to the object side surface of the sixth lens in a direction parallel to the optical axis, and MAX(T56) is the maximum distance from the image side surface of the fifth lens to the object side surface of the sixth lens in a direction parallel to the optical axis.

8. The optical lens assembly according to claim 1, wherein: The optical lens assembly satisfies the following relationship: 514.757≥|f1 / CT1|+|f2 / CT2|+|f3 / CT3|+|f4 / CT4|+|f5 / CT5|+|f6 / CT6|>141; Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

9. An imaging device, characterized in that: include: The optical lens assembly according to any one of claims 1 to 8; and a photosensitive element, wherein the photosensitive element is arranged on the image side of the optical lens group.

10. An electronic device, characterized in that: include: and the imaging device according to claim 9, wherein the imaging device is mounted on the housing.

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