Optical lens and electronic equipment

Abstract

The invention provides an optical lens and electronic equipment. The optical lens sequentially comprises, from a first side to a second side, a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power, the second lens has negative focal power, and the first side surface of the second lens is a concave surface; the first side surface of the third lens is a concave surface, and the second side surface of the third lens is a convex surface; the first side surface of the fourth lens is a convex surface, and the second side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the first side surface of the fifth lens is a convex surface. According to the invention, the problem that an optical lens in the prior art is difficult to give consideration to long rear focal length, small distortion and large field angle at the same time is solved.

Description

Technical Field

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

[0002] In recent years, with the development of science and technology, the demand for optical lenses in daily life has increased, and optical lenses have been applied to more and more scenarios. For example, in the automobile driving industry, for driving safety, it is necessary to detect the driving environment more accurately, and optical lenses have become a key device for detecting information around the car. With the development of smart headlights, the requirements for projection lenses in the application of megapixel headlights are constantly increasing, pursuing higher luminous flux, smaller size, and larger field of view. Different from ordinary projection lenses, projection lenses for smart headlights have more special requirements in terms of assisted driving and safety improvement.

[0003] There are various problems with the existing optical lenses used in smart car headlights. For example, although the existing technology can achieve a resolution of one million pixels, the optical lens has serious aberration problems such as chromatic aberration, astigmatism, and distortion; the projection field of view of the existing technology is limited and cannot meet the needs of a larger projection range; based on miniaturization, the existing technology has a short back focus and cannot leave enough focusing or installation space in the module assembly.

[0004] That is to say, the optical lens in the prior art has the problem that it is difficult to take into account the back focal length, small distortion and large field of view at the same time. Summary of the invention

[0005] The main purpose of the present invention is to provide an optical lens and an electronic device to solve the problem that the optical lens in the prior art has a back focal length, small distortion and a large field of view that are difficult to take into account at the same time.

[0006] In order to achieve the above-mentioned object, according to one aspect of the present invention, an optical lens is provided, which comprises, from the first side to the second side: a first lens with positive optical power, the second side surface of the first lens is a convex surface; a second lens with negative optical power, the first side surface of the second lens is a concave surface; a third lens with positive optical power, the first side surface of the third lens is a concave surface, and the second side surface is a convex surface; a fourth lens with positive optical power, the first side surface of the fourth lens is a convex surface, and the second side surface is a convex surface; a fifth lens with positive optical power, the first side surface of the fifth lens is a convex surface.

[0007] Furthermore, the first side surface of the first lens is a convex surface.

[0008] Furthermore, the first side surface of the first lens is a concave surface.

[0009] Furthermore, the second side surface of the second lens is a concave surface.

[0010] Furthermore, the second side surface of the second lens is a convex surface.

[0011] Furthermore, the second side surface of the fifth lens is a concave surface.

[0012] Furthermore, the second side surface of the fifth lens is a convex surface.

[0013] Furthermore, the optical lens also includes an aperture, and the aperture is arranged between the third lens and the fourth lens.

[0014] Furthermore, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: F / H≥1.2.

[0015] Furthermore, the focal length value F1 of the first lens and the focal length value F of the entire optical lens group satisfy: F1 / F≥1.

[0016] Further, a sag height sag7 of the first side surface of the fourth lens and a sag height sag8 of the second side surface of the fourth lens satisfy: |sag7 / sag8|≥0.1.

[0017] Furthermore, the center thickness d1 of the first lens and the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the last lens of the optical lens to the imaging surface satisfy: (d1*BFL) / (d1+BFL)≥2.

[0018] Furthermore, a radius of curvature R5 of the first side surface of the third lens and the total optical length of the optical lens, that is, a distance TTL from the center of the first side of the first lens to the center of the imaging surface of the optical lens, satisfy: R5 / TTL≤-0.08.

[0019] Furthermore, a radius of curvature R10 of the second side surface of the fifth lens and the total optical length of the optical lens, that is, a distance TTL from the center of the first side of the first lens to the center of the imaging surface of the optical lens, satisfy: R10 / TTL≥-20.

[0020] Further, a curvature radius R3 of the first side surface of the second lens and a curvature radius R4 of the second side surface of the second lens satisfy: |R3 / R4|≤1.5.

[0021] Furthermore, the entire focal length value F of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.009.

[0022] Furthermore, the optical back focus of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, and the total optical length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens to the center of the imaging plane of the optical lens, satisfy the following conditions: BFL / TTL≥0.3.

[0023] Further, the second side sag height sag6 of the third lens and the air space d6 between the third lens and the aperture satisfy: arctan(sag6 / d6)≤3.5.

[0024] Further, an opening angle arctan(1 / K(S6)) of the second side surface of the third lens satisfies: arctan(1 / K(S6))≥-65.

[0025] Furthermore, the entire focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤1.6.

[0026] Furthermore, the optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface, and the lens group length of the optical lens, that is, the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following conditions: BFL / TL≥0.4.

[0027] Furthermore, the effective aperture DST of the aperture and the focal length F of the entire optical lens group satisfy: DST / F≤2.1.

[0028] Furthermore, the maximum field of view FOV of the optical lens, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥50.

[0029] Furthermore, the image height H corresponding to the maximum field angle of the optical lens, the entire focal length value F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: (H / 2) / (F*tan(θ / 2))≤2.1.

[0030] Further, a curvature radius R4 of the second side surface of the second lens and a curvature radius R10 of the second side surface of the fifth lens satisfy: -0.9≤R4 / R10.

[0031] Furthermore, a curvature radius R6 of the second side surface of the third lens and a curvature radius R7 of the first side surface of the fourth lens satisfy: (R6-R7) / (R6+R7)≥-3.

[0032] Furthermore, the focal length F5 of the fifth lens element and the focal length F of the entire optical lens group satisfy: F5 / F≥1.

[0033] Furthermore, the sag height sag7 of the first side surface of the fourth lens, the sag height sag8 of the second side surface of the fourth lens, the center thickness d7 of the fourth lens and the air space d8 between the fourth lens and the fifth lens satisfy: (sag7 / d7) / (sag8 / d8)≥-3.7.

[0034] Furthermore, a curvature radius R4 of the second side surface of the second lens satisfies the relationship between the entire focal length F of the optical lens set: |R4 / F|≥0.5.

[0035] Furthermore, a radius of curvature R10 of the second side surface of the fifth lens element satisfies the relationship between the entire focal length F of the optical lens set: |R10 / F|≥1.3.

[0036] Furthermore, the optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface and the focal length F2 of the second lens satisfy: BFL / F2≤-0.01.

[0037] According to another aspect of the present invention, an optical lens is provided, comprising, from the first side to the second side, in order: a first lens with positive optical power; a second lens with negative optical power; a third lens with positive optical power; a fourth lens with positive optical power; and a fifth lens with positive optical power; the optical back focus of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface and the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following conditions: BFL / TL≥0.4.

[0038] Furthermore, the first side surface of the first lens is a convex surface, and the second side surface is a convex surface.

[0039] Furthermore, the first side surface of the first lens is a concave surface, and the second side surface is a convex surface.

[0040] Furthermore, the first side surface of the second lens is a concave surface, and the second side surface is a concave surface.

[0041] Furthermore, the first side surface of the second lens is a concave surface, and the second side surface is a convex surface.

[0042] Furthermore, the first side surface of the third lens is a concave surface, and the second side surface is a convex surface.

[0043] Furthermore, the first side surface of the fourth lens is a convex surface, and the second side surface is a convex surface.

[0044] Furthermore, the first side surface of the fifth lens is a convex surface, and the second side surface is a concave surface.

[0045] Furthermore, the first side surface of the fifth lens is a convex surface, and the second side surface is a convex surface.

[0046] Furthermore, the optical lens also includes an aperture, and the aperture is arranged between the third lens and the fourth lens.

[0047] Furthermore, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: F / H≥1.2.

[0048] Furthermore, the focal length value F1 of the first lens and the focal length value F of the entire optical lens group satisfy: F1 / F≥1.

[0049] Further, a sag height sag7 of the first side surface of the fourth lens and a sag height sag8 of the second side surface of the fourth lens satisfy: |sag7 / sag8|≥0.1.

[0050] Furthermore, the center thickness d1 of the first lens and the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the last lens of the optical lens to the imaging surface satisfy: (d1*BFL) / (d1+BFL)≥2.

[0051] Furthermore, a radius of curvature R5 of the first side surface of the third lens and the total optical length of the optical lens, that is, a distance TTL from the center of the first side of the first lens to the center of the imaging surface of the optical lens, satisfy: R5 / TTL≤-0.08.

[0052] Furthermore, a radius of curvature R10 of the second side surface of the fifth lens and the total optical length of the optical lens, that is, a distance TTL from the center of the first side of the first lens to the center of the imaging surface of the optical lens, satisfy: R10 / TTL≥-20.

[0053] Further, a curvature radius R3 of the first side surface of the second lens and a curvature radius R4 of the second side surface of the second lens satisfy: |R3 / R4|≤1.5.

[0054] Furthermore, the entire focal length value F of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.009.

[0055] Furthermore, the optical back focus of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging plane, and the total optical length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens to the center of the imaging plane of the optical lens, satisfy the following conditions: BFL / TTL≥0.3.

[0056] Further, the second side sag height sag6 of the third lens and the air space d6 between the third lens and the aperture satisfy: arctan(sag6 / d6)≤3.5.

[0057] Further, an opening angle arctan(1 / K(S6)) of the second side surface of the third lens satisfies: arctan(1 / K(S6))≥-65.

[0058] Furthermore, the entire focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤1.6.

[0059] Furthermore, the effective aperture DST of the aperture and the focal length F of the entire optical lens group satisfy: DST / F≤2.1.

[0060] Furthermore, the maximum field of view FOV of the optical lens, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥50.

[0061] Furthermore, the image height H corresponding to the maximum field angle of the optical lens, the entire focal length value F of the optical lens and the arc value θ of the maximum field angle of the optical lens satisfy: (H / 2) / (F*tan(θ / 2))≤2.1.

[0062] Further, a curvature radius R4 of the second side surface of the second lens and a curvature radius R10 of the second side surface of the fifth lens satisfy: -0.9≤R4 / R10.

[0063] Furthermore, a curvature radius R6 of the second side surface of the third lens and a curvature radius R7 of the first side surface of the fourth lens satisfy: (R6-R7) / (R6+R7)≥-3.

[0064] Furthermore, the focal length F5 of the fifth lens element and the focal length F of the entire optical lens group satisfy: F5 / F≥1.

[0065] Furthermore, the sag height sag7 of the first side surface of the fourth lens, the sag height sag8 of the second side surface of the fourth lens, the center thickness d7 of the fourth lens and the air space d8 between the fourth lens and the fifth lens satisfy: (sag7 / d7) / (sag8 / d8)≥-3.7.

[0066] Furthermore, a curvature radius R4 of the second side surface of the second lens satisfies the relationship between the entire focal length F of the optical lens set: |R4 / F|≥0.5.

[0067] Furthermore, a radius of curvature R10 of the second side surface of the fifth lens element satisfies the relationship between the entire focal length F of the optical lens set: |R10 / F|≥1.3.

[0068] Furthermore, the optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface and the focal length F2 of the second lens satisfy: BFL / F2≤-0.01.

[0069] According to another aspect of the present invention, an electronic device is provided, comprising the above-mentioned optical lens and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

[0070] By applying the technical solution of the present invention, the optical lens comprises, from the first side to the second side, a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power and a fifth lens with positive focal power, wherein the second side surface of the first lens is a convex surface; the first side surface of the second lens is a concave surface; the first side surface of the third lens is a concave surface, and the second side surface is a convex surface; the first side surface of the fourth lens is a convex surface, and the second side surface is a convex surface; and the first side surface of the fifth lens is a convex surface.

[0071] The first lens has positive focal length, and the first side surface of the first lens can be convex or concave, and the second side surface is convex. When the first side surface of the first lens is convex, the positive focal length has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, thereby increasing the system illumination; the first side surface being convex is beneficial to beautiful appearance, easy to clean, and not easy to accumulate dust; the second side surface being convex further converges and collects light, and facilitates the adjustment of the edge field light by the rear system. When the first side surface of the first lens is concave, the positive focal length has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, thereby increasing the system illumination; the first side surface being concave is beneficial to special modeling requirements, and the second side surface being convex is beneficial to smooth the light trend and reduce sensitivity.

[0072] The second lens has negative focal length, and the first side of the second lens is concave, and the second side can be concave or convex. When the second side of the second lens is concave, the negative focal length further diverges the light, adjusts the light deflection angle, and reduces chromatic aberration. The double concave shape is conducive to reducing the sensitivity of the system; the concave surface of the first side cooperates with the first lens to collect and converge the edge field light, and the second side is concave, which is conducive to lengthening the optical back focus, diverging the converged light, and facilitating the rear optical system to receive the edge field light, thereby increasing the system's light transmission capacity. When the second side of the second lens is convex, the negative focal length further diverges the light, adjusts the light deflection angle, reduces chromatic aberration, and allows the divergent light to smoothly enter the rear, further making the light trend smoothly transition; the concave surface of the first side cooperates with the first lens to collect and converge the edge field light, and the second side is convex, which adjusts the light divergence angle, which is conducive to smoothing the light trend and reducing the sensitivity of the rear optical system.

[0073] The third lens has positive focal power, the first side surface of the third lens is concave, and the second side surface is convex. The shape of the third lens is a meniscus lens convex to the second side, the concave surface of the first side surface is conducive to collecting the light passing through the second lens, and the second side surface is convex, which converges the light, makes the light transition smoothly into the aperture, reduces the light angle, and reduces the sensitivity of the rear optical system.

[0074] The fourth lens has positive focal power, and the first side surface of the fourth lens is convex, and the second side surface is convex. The positive focal power is matched with a convex-convex shape, which can cooperate with the aperture to further shrink the light angle, facilitate the collection of the edge field light by the rear optical system, reduce the system aberration, and improve the system illumination.

[0075] The fifth lens has positive focal power, and the first side surface of the fifth lens is convex, and the second side surface can be concave or convex. When the second side surface of the fifth lens is concave, the positive focal power is matched with a meniscus lens convex to the first side, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is convex, which converges light and increases the system illumination, and the second side surface is concave, which further changes the light deflection angle, improves the telecentricity of the main light, and converges light to the imaging surface. When the second side surface of the fifth lens is convex, the positive focal power is matched with a biconvex type, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is convex, which converges light and increases the system illumination, and the second side surface is convex, which is conducive to the lengthening of the back focus, convenient module assembly and focal length adjustment.

[0076] The present application adopts five lenses, and by optimizing the optical focal length and surface shape of each lens, the optical lens of the present invention has at least one beneficial effect of back focal length, small distortion and large field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0078] Figure 1 A schematic structural diagram of an optical lens according to Example 1 of the present invention is shown;

[0079] Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present invention is shown;

[0080] Figure 3 A schematic diagram showing the structure of an optical lens according to Example 3 of the present invention is shown;

[0081] Figure 4 A schematic diagram showing the structure of an optical lens according to Example 4 of the present invention is shown;

[0082] Figure 5 A schematic diagram showing the structure of an optical lens according to Example 5 of the present invention is shown;

[0083] Figure 6 A schematic diagram showing the structure of an optical lens according to Example 6 of the present invention is shown;

[0084] Figure 7 A schematic diagram showing the structure of an optical lens according to Example 7 of the present invention is shown;

[0085] Figure 8 A schematic diagram of the structure of the optical lens of Example 8 of the present invention is shown.

[0086] The above drawings include the following reference numerals:

[0087] L1, first lens; S1, first side surface of the first lens; S2, second side surface of the first lens; L2, second lens; S3, first side surface of the second lens; S4, second side surface of the second lens; L3, third lens; S5, first side surface of the third lens; S6, second side surface of the third lens; STO, aperture; L4, fourth lens; S8, first side surface of the fourth lens; S9, second side surface of the fourth lens; L5, fifth lens; S10, first side surface of the fifth lens; S11, second side surface of the fifth lens; S12, first side surface of the protective glass; S13, second side surface of the protective glass; IMA, imaging surface. DETAILED DESCRIPTION

[0088] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0089] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0090] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0091] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0092] In the 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 shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0093] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens close to the first side is called the first side of the lens, and the surface of each lens close to the second side is called the second side of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of the general knowledgeable person in this field, and the positive and negative R value (R refers to the radius of curvature of the paraxial region, usually refers to the R value on the lens database (lens data) in the optical software) is used to judge the concave and convex. For the first side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the second side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0094] It should be noted that the left side of the optical lens is the first side, and the right side of the optical lens is the second side.

[0095] In an exemplary embodiment, the optical lens provided by the present application can be used as a vehicle-mounted lens. For the vehicle-mounted lens, the left side is the object side and the right side is the image side; the first side is the object side and the second side is the image side. Light from the object side can be imaged on the image side.

[0096] When the optical lens of the present application is applied to a projection lens or a radar transmitting lens, the left side is the imaging side and the right side is the image source side. In an exemplary embodiment, the optical lens provided by the present application can be used as, for example, a projection lens or a laser radar transmitting end lens. In this case, the image side of the optical lens can be the image source side, and the object side can be the imaging side. Light from the image source side can be imaged on the imaging side, and the imaging surface of the optical lens is the image source surface.

[0097] In order to solve the problem in the prior art that it is difficult to take into account the back focal length, small distortion and large field angle at the same time in the optical lens, the present invention provides an optical lens and an electronic device.

[0098] Embodiment 1

[0099] like Figures 1 to 8As shown, the optical lens includes, from the first side to the second side, a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power and a fifth lens with positive optical power, the second side surface of the first lens is convex; the first side surface of the second lens is concave; the first side surface of the third lens is concave, and the second side surface is convex; the first side surface of the fourth lens is convex, and the second side surface is convex; the first side surface of the fifth lens is convex.

[0100] The first lens has positive focal length, and the first side surface of the first lens can be convex or concave, and the second side surface is convex. When the first side surface of the first lens is convex, the positive focal length has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, thereby increasing the system illumination; the first side surface being convex is beneficial to beautiful appearance, easy to clean, and not easy to accumulate dust; the second side surface being convex further converges and collects light, and facilitates the adjustment of the edge field light by the rear system. When the first side surface of the first lens is concave, the positive focal length has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, thereby increasing the system illumination; the first side surface being concave is beneficial to special modeling requirements, and the second side surface being convex is beneficial to smooth the light trend and reduce sensitivity.

[0101] The second lens has negative focal length, and the first side of the second lens is concave, and the second side can be concave or convex. When the second side of the second lens is concave, the negative focal length further diverges the light, adjusts the light deflection angle, and reduces chromatic aberration. The double concave shape is conducive to reducing the sensitivity of the system; the concave surface of the first side cooperates with the first lens to collect and converge the edge field light, and the second side is concave, which is conducive to lengthening the optical back focus, diverging the converged light, and facilitating the rear optical system to receive the edge field light, thereby increasing the system's light transmission capacity. When the second side of the second lens is convex, the negative focal length further diverges the light, adjusts the light deflection angle, reduces chromatic aberration, and allows the divergent light to smoothly enter the rear, further making the light trend smoothly transition; the concave surface of the first side cooperates with the first lens to collect and converge the edge field light, and the second side is convex, which adjusts the light divergence angle, which is conducive to smoothing the light trend and reducing the sensitivity of the rear optical system.

[0102] The third lens has positive focal power, the first side surface of the third lens is concave, and the second side surface is convex. The shape of the third lens is a meniscus lens convex to the second side, the concave surface of the first side surface is conducive to collecting the light passing through the second lens, and the second side surface is convex, which converges the light, makes the light transition smoothly into the aperture, reduces the light angle, and reduces the sensitivity of the rear optical system.

[0103] The fourth lens has positive focal power, and the first side surface of the fourth lens is convex, and the second side surface is convex. The positive focal power is matched with a convex-convex shape, which can cooperate with the aperture to further shrink the light angle, facilitate the collection of the edge field light by the rear optical system, reduce the system aberration, and improve the system illumination.

[0104] The fifth lens has positive focal power, and the first side surface of the fifth lens is convex, and the second side surface can be concave or convex. When the second side surface of the fifth lens is concave, the positive focal power is matched with a meniscus lens convex to the first side, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is convex, which converges light and increases the system illumination, and the second side surface is concave, which further changes the light deflection angle, improves the telecentricity of the main light, and converges light to the imaging surface. When the second side surface of the fifth lens is convex, the positive focal power is matched with a biconvex type, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is convex, which converges light and increases the system illumination, and the second side surface is convex, which is conducive to the lengthening of the back focus, convenient module assembly and focal length adjustment.

[0105] The present application adopts five lenses, and by optimizing the optical focal length and surface shape of each lens, the optical lens of the present invention has at least one beneficial effect of back focal length, small distortion and large field of view.

[0106] In this embodiment, the first side surface of the first lens is a convex surface. The positive optical power has a convergence effect on light, which can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is convex, which is conducive to beautiful appearance, easy to clean, and not easy to accumulate dust. The second side surface is convex, which further converges and collects light, and is convenient for the rear system to adjust the edge field light.

[0107] In this embodiment, the first side surface of the first lens is a concave surface. The positive optical power has a convergence effect on light, which can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is a concave surface, which is beneficial for special modeling needs, and the second side surface is a convex surface, which is beneficial for smoothing the light trend and reducing sensitivity.

[0108] In this embodiment, the second side surface of the second lens is a concave surface. Negative optical power further diverges the light, adjusts the light deflection angle, and reduces chromatic aberration. The double concave surface is conducive to reducing the sensitivity of the system; the concave surface of the first side surface cooperates with the first lens to collect and converge the edge field light. The second side surface is a concave surface, which is conducive to lengthening the optical back focus, diverging the converged light, making it easier for the rear optical system to receive the edge field light, and increasing the system's light transmission capacity.

[0109] In this embodiment, the second side surface of the second lens is a convex surface. The negative focal length further diverges the light, adjusts the light deflection angle, reduces chromatic aberration, allows the divergent light to smoothly enter the rear, and further makes the light trend smoothly transition; the concave surface of the first side surface cooperates with the first lens to collect and converge the edge field light, and the second side surface is a convex surface, which adjusts the light divergence angle, is conducive to smoothing the light trend and reducing the sensitivity of the rear optical system.

[0110] In this embodiment, the second side surface of the fifth lens is a concave surface. The positive focal power is matched with a meniscus lens convex to the first side, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view to increase the system illumination; the first side surface is a convex surface, which converges light and increases the system illumination, and the second side surface is a concave surface, which further changes the light deflection angle, improves the telecentricity of the main light, and converges the light onto the imaging surface.

[0111] In this embodiment, the second side surface of the fifth lens is a convex surface. The positive focal power is matched with the biconvex surface, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view to increase the system illumination; the first side surface is a convex surface, which converges light and increases the system illumination, and the second side surface is a convex surface, which is conducive to the extension of the back focus, and is convenient for the assembly of the module and the adjustment of the focal length.

[0112] In this embodiment, the optical lens further includes an aperture, which is disposed between the third lens and the fourth lens. The aperture is located between the third lens and the fourth lens, which is conducive to smoothing the light entering the optical system, reducing the lens aperture at the rear end of the optical system, and reducing the assembly sensitivity of the system.

[0113] In this embodiment, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: F / H ≥ 1.2. Satisfying this conditional expression ensures that the focal length and image height are controlled within a certain range, which is conducive to improving the resolution. Preferably, F / H ≥ 2.

[0114] In this embodiment, the focal length value F1 of the first lens and the focal length value F of the entire optical lens group satisfy: F1 / F≥1. Satisfying this conditional expression is conducive to reasonably allocating the focal length of the first lens and facilitating the entry of light with a large field angle into the optical system. Preferably, F1 / F≥1.5.

[0115] In this embodiment, the sag height sag7 of the first side surface of the fourth lens and the sag height sag8 of the second side surface of the fourth lens satisfy: |sag7 / sag8|≥0.1. Satisfying this conditional expression ensures that the sag heights of the two surfaces of the fourth lens are close, which is conducive to the smooth transition of light, thereby effectively reducing the system aberration and achieving small distortion. Preferably, |sag7 / sag8|≥0.2.

[0116] In this embodiment, the center thickness d1 of the first lens and the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface satisfy: (d1*BFL) / (d1+BFL)≥2. Satisfying this conditional expression helps to balance the ratio of the back focus and the distance between the first lens and the second lens, which can increase the assembly yield, and at the same time helps to make the optical lens have enough back focus to place other optical elements, so as to increase the design flexibility. Preferably, (d1*BFL) / (d1+BFL)≥3.5.

[0117] In this embodiment, the radius of curvature R5 of the first side surface of the third lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens to the imaging surface of the optical lens, satisfy the following condition: R5 / TTL≤-0.08. When this condition is satisfied, the relative position of the pupil image of the secondary reflection ghost image of the first side surface of the third lens on the focal plane can be changed. By controlling the radius of curvature, the pupil image of the ghost image can be moved away from the focal plane, effectively reducing the relative energy value of the ghost image and improving the quality of the imaging picture. Preferably, R5 / TTL≤-0.3.

[0118] In this embodiment, the radius of curvature R10 of the second side surface of the fifth lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens to the imaging surface of the optical lens, satisfy: R10 / TTL≥-20. By controlling this conditional expression, the relative position of the pupil image of the secondary reflection ghost image of the second side surface of the fifth lens on the focal plane can be changed. By controlling the radius of curvature, the pupil image of the ghost image can be moved away from the focal plane, effectively reducing the relative energy value of the ghost image and improving the quality of the imaging picture. Preferably, R10 / TTL≥-15.

[0119] In this embodiment, the curvature radius R3 of the first side surface of the second lens and the curvature radius R4 of the second side surface of the second lens satisfy: |R3 / R4|≤1.5. Controlling the curvature radius of the two side surfaces of the second lens within this range is conducive to collecting more light and increasing the light transmission capacity of the system. Preferably, |R3 / R4|≤0.6.

[0120] In this embodiment, the whole set focal length value F of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.009. This conditional expression is satisfied to ensure that the focal length of the optical lens is increased while the field angle of the optical lens and the size of the imaging surface remain unchanged, and the imaging effect of the central area of ​​the imaging surface of the optical lens is highlighted. Preferably, |(HF*θ) / (F*θ)|≤0.007.

[0121] In this embodiment, the optical back focus of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface, and the optical total length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens to the center of the imaging surface of the optical lens, satisfy the following relationship: BFL / TTL≥0.3. This conditional expression is satisfied to meet the special requirements of the back focus length of the optical lens, and space can also be reserved for the installation and focusing of the optical elements to avoid interference of the mechanism. Preferably, BFL / TTL≥0.42.

[0122] In this embodiment, the sag height sag6 of the second side of the third lens and the air interval d6 between the third lens and the aperture satisfy: arctan (sag6 / d6) ≤ 3.5. Satisfying this conditional expression is beneficial to improving illumination and reducing distortion. Preferably, arctan arctan (sag6 / d6) ≤ 2.

[0123] In this embodiment, the opening angle arctan(1 / K(S6)) of the second side surface of the third lens satisfies: arctan(1 / K(S6))≥-65. Satisfying this conditional expression ensures that the opening angle of the second side surface of the third lens is large, which is conducive to the rapid focusing of large-angle peripheral light entering through the third lens, thereby improving the imaging quality. Preferably, arctan(1 / K(S6))≥-55.

[0124] In this embodiment, the entire focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤1.6. Satisfying this conditional expression is conducive to achieving a small FNO and increasing the amount of light passing. Preferably, F / ENPD≤1.45.

[0125] In this embodiment, the optical back focus of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface, and the length of the lens group of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: BFL / TL≥0.4. When this condition is satisfied, the back focus length is guaranteed on the basis of miniaturization, which is conducive to the assembly of the module. Preferably, BFL / TL≥0.6.

[0126] In this embodiment, the effective aperture DST of the diaphragm and the focal length F of the entire optical lens group satisfy: DST / F≤2.1. This conditional expression is satisfied to ensure that the ratio of the aperture diameter to the effective focal length is larger, and the aperture of the optical lens is larger. Preferably, DST / F≤1.4.

[0127] In this embodiment, the maximum field of view FOV of the optical lens, the focal length value F of the entire set of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥50. Satisfying this conditional expression can simultaneously satisfy a large angular resolution and a large field of view. Preferably, (FOV×F) / H≥54.

[0128] In this embodiment, the image height H corresponding to the maximum field angle of the optical lens, the focal length value F of the entire optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: (H / 2) / (F*tan(θ / 2))≤2.1. Reasonably setting the ratio of the actual image height to the ideal image height can achieve high angular resolution. Preferably, (H / 2) / (F*tan(θ / 2))≤1.2.

[0129] In this embodiment, the curvature radius R4 of the second side surface of the second lens and the curvature radius R10 of the second side surface of the fifth lens satisfy: -0.9≤R4 / R10. By adjusting the R value of the key surface type, the second side surface of the second lens is concave, which has a divergent effect on the light, making the edge field optical path larger; the second side surface of the fifth lens is set to be concave, which deflects the light and thus lengthens the back focus. Preferably, -0.85≤R4 / R10.

[0130] In this embodiment, the curvature radius R6 of the second side surface of the third lens and the curvature radius R7 of the first side surface of the fourth lens satisfy: (R6-R7) / (R6+R7)≥-3. This conditional expression is satisfied to ensure that when the light emitted from the third lens is incident on the first surface of the fourth lens, the incident light is relatively gentle, thereby reducing the tolerance sensitivity of the optical system. Preferably, (R6-R7) / (R6+R7)≥-2.

[0131] In this embodiment, the focal length F5 of the fifth lens and the focal length F of the entire optical lens group satisfy: F5 / F≥1. Satisfying this conditional expression is conducive to reasonably allocating the focal length of the fifth lens, and is conducive to large field angle light entering the optical system, thereby improving the resolution capability. Preferably, F5 / F≥1.5.

[0132] In this embodiment, the sag height sag7 of the first side surface of the fourth lens, the sag height sag8 of the second side surface of the fourth lens, the center thickness d7 of the fourth lens, and the air interval d8 between the fourth lens and the fifth lens satisfy: (sag7 / d7) / (sag8 / d8)≥-3.7. The two surfaces of the fourth lens are arranged to be close in shape so that the peripheral light transitions smoothly, which is conducive to reducing the sensitivity of the lens. Preferably, (sag7 / d7) / (sag8 / d8)≥-2.8.

[0133] In this embodiment, the radius of curvature R4 of the second side surface of the second lens satisfies the entire focal length F of the optical lens set: |R4 / F|≥0.5. By reasonably setting the radius of curvature of the second side surface of the second lens, it is helpful to adjust the light divergence angle, smooth the light trend, reduce the sensitivity of the rear optical system, and increase the light transmission capacity of the system. Preferably, |R4 / F|≥0.88.

[0134] In this embodiment, the curvature radius R10 of the second side surface of the fifth lens satisfies the entire focal length F of the optical lens set: |R10 / F|≥1.3. By reasonably setting the curvature radius of the second side surface of the fifth lens, the light deflection angle is changed, which is beneficial to the lengthening of the back focus, and facilitates the assembly of the module and the adjustment of the focal length. Preferably, |R10 / F|≥2.

[0135] In this embodiment, the optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface and the focal length F2 of the second lens satisfy: BFL / F2≤-0.01. By setting the focal power of the second lens to be negative, the light is fully diverged after passing through the second lens, which is conducive to increasing the main light angle, and then setting a long back focus so that the light can be better converged on the imaging surface. Preferably, BFL / F2≤-0.3.

[0136] Embodiment 2

[0137] like Figures 1 to 8 As shown, the optical lens includes, from the first side to the second side, in sequence: a first lens with positive focal power; a second lens with negative focal power; a third lens with positive focal power; a fourth lens with positive focal power; a fifth lens with positive focal power; the optical back focus of the optical lens, i.e., the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface and the lens group length of the optical lens, i.e., the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy: BFL / TL≥0.4. This conditional formula is satisfied, the special requirements of the back focus length of the optical lens are met, and space can be reserved for the installation and focusing of optical elements to avoid interference with the mechanism. Preferably, BFL / TL≥0.6.

[0138] In this embodiment, the first side surface of the first lens is a convex surface, and the second side surface is a convex surface. The positive optical power has a convergence effect on light, which can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is convex, which is conducive to beautiful appearance, easy to clean, and not easy to accumulate dust. The second side surface is convex, which further converges and collects light, and is convenient for the rear system to adjust the edge field light.

[0139] In this embodiment, the first side surface of the first lens is concave, and the second side surface is convex. The positive optical power has a convergence effect on light, which can effectively converge the central light and edge light of each field of view, and increase the system illumination; the first side surface is concave, which is beneficial for special modeling needs, and the second side surface is convex, which is beneficial for smoothing the light trend and reducing sensitivity.

[0140] In this embodiment, the first side surface of the second lens is concave, and the second side surface is concave. Negative optical power further diverges the light, adjusts the light deflection angle, and reduces chromatic aberration. The double concave surface is conducive to reducing the sensitivity of the system; the concave surface of the first side surface cooperates with the first lens to collect and converge the edge field light, and the second side surface is concave, which is conducive to lengthening the optical back focus, diverging the converged light, making it easier for the rear optical system to receive the edge field light, and increasing the system's light transmission capacity.

[0141] In this embodiment, the first side surface of the second lens is a concave surface, and the second side surface is a convex surface. The negative optical power further diverges the light, adjusts the light deflection angle, reduces chromatic aberration, allows the divergent light to smoothly enter the rear, and further makes the light trend smoothly transition; the concave surface of the first side surface cooperates with the first lens to collect and converge the edge field light, and the second side surface is a convex surface, which adjusts the light divergence angle, is conducive to smoothing the light trend and reducing the sensitivity of the rear optical system.

[0142] In this embodiment, the first side surface of the third lens is a concave surface, and the second side surface is a convex surface. The shape of the third lens is a meniscus lens convex to the second side, the concave surface of the first side surface is conducive to collecting the light passing through the second lens, and the second side surface is a convex surface, which converges the light, so that the light transitions smoothly into the aperture, reduces the light angle, and reduces the sensitivity of the rear optical system.

[0143] In this embodiment, the first side surface of the fourth lens is convex, and the second side surface is convex. The positive focal length is convex-convex, which can cooperate with the aperture to further shrink the light angle, facilitate the collection of edge field light by the rear optical system, reduce system aberrations, and improve system illumination.

[0144] In this embodiment, the first side surface of the fifth lens is convex, and the second side surface is concave. The positive focal power is matched with a meniscus lens convex to the first side, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view to increase the system illumination; the first side surface is convex, which converges light and increases the system illumination, and the second side surface is concave, which further changes the light deflection angle, improves the telecentricity of the main light, and converges the light onto the imaging surface.

[0145] In this embodiment, the first side surface of the fifth lens is convex, and the second side surface is convex. The positive focal power is matched with the biconvex surface, which has a convergence effect on light, and can effectively converge the central light and edge light of each field of view to increase the system illumination; the first side surface is convex, which converges light and increases the system illumination, and the second side surface is convex, which is conducive to the extension of the back focus, and facilitates the assembly of the module and the adjustment of the focal length.

[0146] The present application adopts five lenses, and by optimizing the optical focal length and surface shape of each lens, the optical lens of the present invention has at least one beneficial effect of back focal length, small distortion and large field of view.

[0147] In this embodiment, the optical lens further includes an aperture, which is disposed between the third lens and the fourth lens. The aperture is located between the third lens and the fourth lens, which is conducive to smoothing the light entering the optical system, reducing the lens aperture at the rear end of the optical system, and reducing the assembly sensitivity of the system.

[0148] In this embodiment, the entire focal length value F of the optical lens and the image height H corresponding to the maximum field angle of the optical lens satisfy: F / H ≥ 1.2. Satisfying this conditional expression ensures that the focal length and image height are controlled within a certain range, which is conducive to improving the resolution. Preferably, F / H ≥ 2.

[0149] In this embodiment, the focal length value F1 of the first lens and the focal length value F of the entire optical lens group satisfy: F1 / F≥1. Satisfying this conditional expression is conducive to reasonably allocating the focal length of the first lens and facilitating the entry of light with a large field angle into the optical system. Preferably, F1 / F≥1.5.

[0150] In this embodiment, the sag height sag7 of the first side surface of the fourth lens and the sag height sag8 of the second side surface of the fourth lens satisfy: |sag7 / sag8|≥0.1. Satisfying this conditional expression ensures that the sag heights of the two surfaces of the fourth lens are close, which is conducive to the smooth transition of light, thereby effectively reducing the system aberration and achieving small distortion. Preferably, |sag7 / sag8|≥0.2.

[0151] In this embodiment, the center thickness d1 of the first lens and the optical back focus of the optical lens, that is, the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface satisfy: (d1*BFL) / (d1+BFL)≥2. Satisfying this conditional expression helps to balance the ratio of the back focus and the distance between the first lens and the second lens, which can increase the assembly yield, and at the same time helps to make the optical lens have enough back focus to place other optical elements, so as to increase the design flexibility. Preferably, (d1*BFL) / (d1+BFL)≥3.5.

[0152] In this embodiment, the radius of curvature R5 of the first side surface of the third lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens to the imaging surface of the optical lens, satisfy the following condition: R5 / TTL≤-0.08. When this condition is satisfied, the relative position of the pupil image of the secondary reflection ghost image of the first side surface of the third lens on the focal plane can be changed. By controlling the radius of curvature, the pupil image of the ghost image can be moved away from the focal plane, effectively reducing the relative energy value of the ghost image and improving the quality of the imaging picture. Preferably, R5 / TTL≤-0.3.

[0153] In this embodiment, the radius of curvature R10 of the second side surface of the fifth lens and the total optical length of the optical lens, that is, the center distance TTL from the center of the first side of the first lens to the imaging surface of the optical lens, satisfy: R10 / TTL≥-20. By controlling this conditional expression, the relative position of the pupil image of the secondary reflection ghost image of the second side surface of the fifth lens on the focal plane can be changed. By controlling the radius of curvature, the pupil image of the ghost image can be moved away from the focal plane, effectively reducing the relative energy value of the ghost image and improving the quality of the imaging picture. Preferably, R10 / TTL≥-15.

[0154] In this embodiment, the curvature radius R3 of the first side surface of the second lens and the curvature radius R4 of the second side surface of the second lens satisfy: |R3 / R4|≤1.5. Controlling the curvature radius of the two side surfaces of the second lens within this range is conducive to collecting more light and increasing the light transmission capacity of the system. Preferably, |R3 / R4|≤0.6.

[0155] In this embodiment, the whole set focal length value F of the optical lens, the image height H corresponding to the maximum field angle of the optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: |(HF*θ) / (F*θ)|≤0.009. This conditional expression is satisfied to ensure that the focal length of the optical lens is increased while the field angle of the optical lens and the size of the imaging surface remain unchanged, and the imaging effect of the central area of ​​the imaging surface of the optical lens is highlighted. Preferably, |(HF*θ) / (F*θ)|≤0.007.

[0156] In this embodiment, the optical back focus of the optical lens, i.e., the center distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface, and the optical total length of the optical lens, i.e., the center distance TTL from the center of the first side of the first lens to the center of the imaging surface of the optical lens, satisfy the following relationship: BFL / TTL≥0.3. This conditional expression is satisfied to meet the special requirements of the back focus length of the optical lens, and space can also be reserved for the installation and focusing of the optical elements to avoid interference of the mechanism. Preferably, BFL / TTL≥0.42.

[0157] In this embodiment, the sag height sag6 of the second side of the third lens and the air interval d6 between the third lens and the aperture satisfy: arctan (sag6 / d6) ≤ 3.5. Satisfying this conditional expression is beneficial to improving illumination and reducing distortion. Preferably, arctan arctan (sag6 / d6) ≤ 2.

[0158] In this embodiment, the opening angle arctan(1 / K(S6)) of the second side surface of the third lens satisfies: arctan(1 / K(S6))≥-65. Satisfying this conditional expression ensures that the opening angle of the second side surface of the third lens is large, which is conducive to the rapid focusing of large-angle peripheral light entering through the third lens, thereby improving the imaging quality. Preferably, arctan(1 / K(S6))≥-55.

[0159] In this embodiment, the entire focal length value F of the optical lens and the entrance pupil diameter ENPD of the optical lens satisfy: F / ENPD≤1.6. Satisfying this conditional expression is conducive to achieving a small FNO and increasing the amount of light passing. Preferably, F / ENPD≤1.45.

[0160] In this embodiment, the effective aperture DST of the diaphragm and the focal length F of the entire optical lens group satisfy: DST / F≤2.1. This conditional expression is satisfied to ensure that the ratio of the aperture diameter to the effective focal length is larger, and the aperture of the optical lens is larger. Preferably, DST / F≤1.4.

[0161] In this embodiment, the maximum field of view FOV of the optical lens, the focal length value F of the entire set of the optical lens, and the image height H corresponding to the maximum field of view of the optical lens satisfy: (FOV×F) / H≥50. Satisfying this conditional expression can simultaneously satisfy a large angular resolution and a large field of view. Preferably, (FOV×F) / H≥54.

[0162] In this embodiment, the image height H corresponding to the maximum field angle of the optical lens, the focal length value F of the entire optical lens, and the arc value θ of the maximum field angle of the optical lens satisfy: (H / 2) / (F*tan(θ / 2))≤2.1. Reasonably setting the ratio of the actual image height to the ideal image height can achieve high angular resolution. Preferably, (H / 2) / (F*tan(θ / 2))≤1.2.

[0163] In this embodiment, the curvature radius R4 of the second side surface of the second lens and the curvature radius R10 of the second side surface of the fifth lens satisfy: -0.9≤R4 / R10. By adjusting the R value of the key surface type, the second side surface of the second lens is concave, which has a divergent effect on the light, making the edge field optical path larger; the second side surface of the fifth lens is set to be concave, which deflects the light and thus lengthens the back focus. Preferably, -0.85≤R4 / R10.

[0164] In this embodiment, the curvature radius R6 of the second side surface of the third lens and the curvature radius R7 of the first side surface of the fourth lens satisfy: (R6-R7) / (R6+R7)≥-3. This conditional expression is satisfied to ensure that when the light emitted from the third lens is incident on the first surface of the fourth lens, the incident light is relatively gentle, thereby reducing the tolerance sensitivity of the optical system. Preferably, (R6-R7) / (R6+R7)≥-2.

[0165] In this embodiment, the focal length F5 of the fifth lens and the focal length F of the entire optical lens group satisfy: F5 / F≥1. Satisfying this conditional expression is conducive to reasonably allocating the focal length of the fifth lens, and is conducive to large field angle light entering the optical system, thereby improving the resolution capability. Preferably, F5 / F≥1.5.

[0166] In this embodiment, the sag height sag7 of the first side surface of the fourth lens, the sag height sag8 of the second side surface of the fourth lens, the center thickness d7 of the fourth lens, and the air interval d8 between the fourth lens and the fifth lens satisfy: (sag7 / d7) / (sag8 / d8)≥-3.7. The two surfaces of the fourth lens are arranged to be close in shape so that the peripheral light transitions smoothly, which is conducive to reducing the sensitivity of the lens. Preferably, (sag7 / d7) / (sag8 / d8)≥-2.8.

[0167] In this embodiment, the radius of curvature R4 of the second side surface of the second lens satisfies the entire focal length F of the optical lens set: |R4 / F|≥0.5. By reasonably setting the radius of curvature of the second side surface of the second lens, it is helpful to adjust the light divergence angle, smooth the light trend, reduce the sensitivity of the rear optical system, and increase the light transmission capacity of the system. Preferably, |R4 / F|≥0.88.

[0168] In this embodiment, the curvature radius R10 of the second side surface of the fifth lens satisfies the entire focal length F of the optical lens set: |R10 / F|≥1.3. By reasonably setting the curvature radius of the second side surface of the fifth lens, the light deflection angle is changed, which is beneficial to the lengthening of the back focus, and facilitates the assembly of the module and the adjustment of the focal length. Preferably, |R10 / F|≥2.

[0169] In this embodiment, the optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface and the focal length F2 of the second lens satisfy: BFL / F2≤-0.01. By setting the focal power of the second lens to be negative, the light is fully diverged after passing through the second lens, which is conducive to increasing the main light angle, and then setting a long back focus so that the light can be better converged on the imaging surface. Preferably, BFL / F2≤-0.3.

[0170] Optionally, the optical lens may further include a color filter for correcting color deviation and a protective glass for protecting a photosensitive element located on the imaging surface.

[0171] The optical lens in the present application may use multiple lenses, such as the five lenses mentioned above. The present application does not specifically limit the specific number of spherical lenses and aspherical lenses. When focusing on imaging quality, the number of aspherical lenses can be increased. The characteristics of aspherical lenses are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike spherical lenses with constant curvature from the center of the lens to the periphery of the lens, aspherical lenses have better curvature radius characteristics, and have the advantages of improving distortion aberrations and improving astigmatism aberrations. After using aspherical lenses, the aberrations that occur during imaging can be eliminated as much as possible, thereby improving imaging quality.

[0172] In an exemplary embodiment, the present solution does not limit the plastic and glass of the lens. If the focus is on temperature performance, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens can all be glass lenses. An optical lens made of glass can suppress the deviation of the back focus of the optical lens with temperature changes to improve the stability of the system. At the same time, the use of glass material can avoid the lens imaging blur caused by high and low temperature changes in the use environment, which affects the normal use of the optical lens. For example, the temperature range of the optical lens with an all-glass design is wider, and stable optical performance can be maintained in the range of -40°C to 105°C. Specifically, when focusing on resolution quality and reliability, the first lens to the fifth lens can all be glass aspherical lenses. Of course, in applications where temperature stability requirements are lower, the first lens to the fifth lens in the optical lens can also be made of plastic. Making optical lenses with plastic can effectively reduce production costs. Of course, the first lens to the fifth lens in the optical lens can also be made of a combination of plastic and glass.

[0173] The present application also provides an electronic device, comprising the above-mentioned optical lens and an imaging element that converts an optical image formed by the optical lens into an electrical signal. The imaging element may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The electronic device may be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The electronic device is equipped with the above-described optical lens.

[0174] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the optical lens can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiment, the optical lens is not limited to including five lenses. If necessary, the optical lens may also include other numbers of lenses.

[0175] The following further describes examples of specific surface shapes and parameters of the optical lens applicable to the above-mentioned embodiments with reference to the accompanying drawings.

[0176] It should be noted that any one of the following examples 1 to 8 is applicable to all embodiments of the present application.

[0177] Example 1

[0178] like Figure 1 The figure shows a schematic diagram of the optical lens structure of Example 1.

[0179] like Figure 1 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0180] The first lens L1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is concave. The light from the first side passes through each surface S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0181] In this example, the total effective focal length F of the optical lens is 35.375 mm, the maximum field of view FOV of the optical lens is 22.358°, and the total length TTL of the optical lens is 87.000 mm.

[0182] Table 1 shows a basic structural parameter table of the optical lens of Example 1, wherein the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0183] Surf Radius Thickness Nd Vd 1 192.450 5.002 1.85 23.79 2 -83.386 12.274 3 -19.853 5.127 1.85 23.79 4 130.290 6.717 5 -165.664 9.266 1.62 63.41 6 -23.541 -3.650 STO Infinity 4.148 8 88.502 4.797 1.62 60.34 9 -174.120 0.500 10 35.980 5.109 1.62 60.34 11 97.197 36.299 12 Infinity 1.100 1.51 62.75 13 Infinity 0.310 IMA / /

[0184] Table 1

[0185] Example 2

[0186] like Figure 2 , which is a schematic diagram of the optical lens structure of Example 2.

[0187] like Figure 2As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0188] The first lens L1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is concave. The light from the first side passes through each surface S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0189] In this example, the total effective focal length F of the optical lens is 35.369 mm, the maximum field of view FOV of the optical lens is 22.358°, and the total length TTL of the optical lens is 87.000 mm.

[0190] Table 2 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0191] Surf Radius Thickness Nd Vd 1 193.670 5.002 1.85 23.79 2 -83.386 12.274 3 -19.853 5.127 1.85 23.79 4 130.290 6.717 5 -165.664 9.266 1.62 63.41 6 -23.541 -3.650 STO Infinity 4.148 8 88.502 4.797 1.62 60.34 9 -174.120 0.500 10 35.980 5.109 1.62 60.34 11 97.197 36.299 12 Infinity 1.100 1.51 62.75 13 Infinity 0.310 IMA / /

[0192] Table 2

[0193] Example 3

[0194] like Figure 3 The figure shows a schematic diagram of the optical lens structure of Example 3.

[0195] like Figure 3 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0196] The first lens L1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is concave. The light from the first side passes through each surface S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0197] In this example, the total effective focal length F of the optical lens is 35.327 mm, the maximum field of view FOV of the optical lens is 22.359°, and the total length TTL of the optical lens is 86.005 mm.

[0198] Table 3 shows the basic structural parameter table of the optical lens of Example 3, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0199] Surf Radius Thickness Nd Vd 1 588.130 4.944 1.85 23.79 2 -85.280 13.177 3 -19.252 5.127 1.85 23.79 4 -129.729 3.688 5 -46.711 9.446 1.62 63.41 6 -23.438 -3.648 STO Infinity 4.146 8 154.550 5.386 1.62 60.34 9 -71.430 0.500 10 37.861 5.529 1.62 60.34 11 159.050 36.299 12 Infinity 1.100 1.51 62.75 13 Infinity 0.310 IMA / /

[0200] Table 3

[0201] Example 4

[0202] like Figure 4 The figure shows a schematic diagram of the optical lens structure of Example 4.

[0203] like Figure 4 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0204] The first lens L1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is concave. The light from the first side passes through each surface S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0205] In this example, the total effective focal length F of the optical lens is 35.290 mm, the maximum field of view FOV of the optical lens is 22.359°, and the total length TTL of the optical lens is 86.005 mm.

[0206] Table 4 shows the basic structural parameter table of the optical lens of Example 4, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0207] Surf Radius Thickness Nd Vd 1 588.130 4.944 1.85 23.79 2 -85.280 13.177 3 -19.252 5.127 1.85 23.79 4 -129.729 3.688 5 -46.711 9.446 1.62 63.41 6 -23.438 -3.648 STO Infinity 4.146 8 154.550 5.386 1.62 60.34 9 -71.430 0.500 10 37.861 5.529 1.62 60.34 11 160.010 36.299 12 Infinity 1.100 1.51 62.75 13 Infinity 0.310 IMA / /

[0208] Table 4

[0209] Example 5

[0210] like Figure 5 The figure shows a schematic diagram of the optical lens structure of Example 5.

[0211] like Figure 5 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0212] The first lens L1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is convex. The light from the first side passes through the surfaces S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0213] In this example, the total effective focal length F of the optical lens is 35.299 mm, the maximum field of view FOV of the optical lens is 22.359°, and the total length TTL of the optical lens is 86.758 mm.

[0214] Table 5 shows the basic structural parameter table of the optical lens of Example 5, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0215]

[0216]

[0217] Table 5

[0218] Example 6

[0219] like Figure 6 Shown is a schematic diagram of the optical lens structure of Example 6.

[0220] like Figure 6 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0221] The first lens L1 has positive power, the first side surface S1 of the first lens is convex, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is concave. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is convex. The light from the first side passes through the surfaces S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0222] In this example, the total effective focal length F of the optical lens is 35.296 mm, the maximum field of view FOV of the optical lens is 22.359°, and the total length TTL of the optical lens is 86.758 mm.

[0223] Table 6 shows the basic structural parameter table of the optical lens of Example 6, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0224] Surf Radius Thickness Nd Vd 1 150.963 5.281 1.85 23.79 2 -150.100 14.012 3 -22.333 5.127 1.85 23.79 4 405.909 4.714 5 -98.030 9.429 1.62 63.41 6 -25.749 -2.351 STO Infinity 2.850 8 292.111 4.077 1.62 60.34 9 -93.942 0.500 10 38.931 6.303 1.62 60.34 11 -1035.780 35.405 12 Infinity 1.100 1.51 62.75 13 Infinity 0.310 IMA / /

[0225] Table 6

[0226] Example 7

[0227] like Figure 7 The figure shows the schematic diagram of the optical lens structure of Example 7.

[0228] like Figure 7 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0229] The first lens L1 has positive power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is concave. The light from the first side passes through the surfaces S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0230] In this example, the total effective focal length F of the optical lens is 35.326 mm, the maximum field of view FOV of the optical lens is 22.359°, and the total length TTL of the optical lens is 87.001 mm.

[0231] Table 7 shows the basic structural parameter table of the optical lens of Example 7, wherein the units of the radius of curvature Radius and the thickness / distance are both millimeters (mm).

[0232] Surf Radius Thickness Nd Vd 1 -101.327 6.540 1.85 23.79 2 -64.570 20.894 3 -18.815 5.127 1.85 23.79 4 -42.513 1.000 5 -51.998 5.708 1.62 63.41 6 -25.525 -2.347 STO Infinity 2.842 8 185.741 4.952 1.62 60.34 9 -70.382 0.500 10 44.830 5.323 1.62 60.34 11 1941.644 35.052 12 Infinity 1.100 1.51 62.75 13 Infinity 0.310 IMA / /

[0233] Table 7

[0234] Example 8

[0235] like Figure 8 Shown is a schematic diagram of the optical lens structure of Example 8.

[0236] like Figure 8 As shown, the optical lens includes, from the first side to the second side, a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a first side surface S12 of the protective glass, a second side surface S13 of the protective glass, and an imaging surface IMA.

[0237] The first lens L1 has positive power, the first side surface S1 of the first lens is concave, and the second side surface S2 of the first lens is convex. The second lens L2 has negative power, the first side surface S3 of the second lens is concave, and the second side surface S4 of the second lens is convex. The third lens L3 has positive power, the first side surface S5 of the third lens is concave, and the second side surface S6 of the third lens is convex. The fourth lens L4 has positive power, the first side surface S8 of the fourth lens is convex, and the second side surface S9 of the fourth lens is convex. The fifth lens L5 has positive power, the first side surface S10 of the fifth lens is convex, and the second side surface S11 of the fifth lens is concave. The light from the first side passes through the surfaces S1 to S13 in sequence and is finally imaged on the imaging surface IMA.

[0238] In this example, the total effective focal length F of the optical lens is 35.430 mm, the maximum field of view FOV of the optical lens is 22.359°, and the total length TTL of the optical lens is 87.001 mm.

[0239] Table 8 shows the basic structural parameter table of the optical lens of Example 8, wherein the units of the radius of curvature and thickness / distance are both millimeters (mm).

[0240] Surf Radius Thickness Nd Vd 1 -101.327 6.540 1.85 23.79 2 -64.570 20.894 3 -18.815 5.127 1.85 23.79 4 -42.513 1.000 5 -51.998 5.708 1.62 63.41 6 -25.525 -2.347 STO Infinity 2.842 8 190.045 4.952 1.62 60.34 9 -70.382 0.500 10 44.830 5.323 1.62 60.34 11 1941.644 35.052 12 Infinity 1.100 1.51 62.75 13 Infinity 0.310 IMA / /

[0241] Table 8

[0242] In summary, Examples 1 to 8 respectively satisfy the relationships shown in Table 9.

[0243]

[0244]

[0245] Table 9

[0246] Table 10 gives the total effective focal length F of the optical lenses of Examples 1 to 8, the effective focal lengths F1 to F5 of each lens, etc. (unit: mm).

[0247]

[0248]

[0249] Table 10

[0250] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0251] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0252] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0253] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: From the first side to the second side, it includes: A first lens having positive optical power, wherein the second side surface of the first lens is a convex surface; a second lens having negative optical power, wherein the first side surface of the second lens is a concave surface; a third lens having positive optical power, wherein the first side surface of the third lens is concave and the second side surface is convex; a fourth lens having positive power, wherein the first side surface of the fourth lens is convex, and the second side surface of the fourth lens is convex; A fifth lens element having positive optical power, wherein the first side surface of the fifth lens element is a convex surface.

2. The optical lens according to claim 1, characterized in that: The first side surface of the first lens is a convex surface.

3. The optical lens according to claim 1, characterized in that: The first side surface of the first lens is a concave surface.

4. The optical lens according to claim 1, characterized in that: The second side surface of the second lens is a concave surface.

5. The optical lens according to claim 1, characterized in that: The second side surface of the second lens is a convex surface.

6. The optical lens according to claim 1, characterized in that: The second side surface of the fifth lens is a concave surface.

7. The optical lens according to claim 1, characterized in that: The second side surface of the fifth lens is a convex surface.

8. The optical lens according to claim 1, characterized in that: The optical lens further includes a stop, and the stop is disposed between the third lens and the fourth lens.

9. An optical lens, characterized in that: From the first side to the second side, it includes: a first lens having positive optical power; a second lens having negative optical power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having positive refractive power; The optical back focus of the optical lens, that is, the distance BFL from the center of the second side of the last lens of the optical lens to the center of the imaging surface, and the lens group length of the optical lens, that is, the distance TL from the center of the first side of the first lens to the center of the second side of the last lens of the optical lens, satisfy the following condition: BFL / TL≥0.

4.

10. An electronic device, characterized in that: The invention comprises the optical lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.

Images