Optical lens

Abstract

The present application discloses an optical lens, which includes, in order from the object side to the image side along the optical axis: a first lens having negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens having positive optical power, whose object side surface is concave and whose image side surface is convex; a third lens having positive optical power, whose object side surface is concave and whose image side surface is convex; a fourth lens having positive optical power, whose object side surface is convex and whose image side surface is convex; a fifth lens having negative optical power, whose object side surface is concave and whose image side surface is concave; a sixth lens having positive optical power, whose object side surface is convex and whose image side surface is convex; and a seventh lens having negative optical power, whose object side surface is convex and whose image side surface is concave. The optical lens satisfies the following conditions: -1≤F4 / F1≤-0.3, where F4 is the effective focal length of the fourth lens and F1 is the effective focal length of the first lens.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and in particular, to an optical lens. Background Art

[0002] With the increasing popularity of security surveillance equipment, the market is placing increasingly higher demands on surveillance equipment. For example, surveillance equipment must provide clear images even in dimly lit environments. To meet this market demand, many surveillance equipment manufacturers are placing higher demands on the optical lenses used in surveillance equipment.

[0003] Because a larger lens aperture allows more light to pass through, making it easier to achieve good imaging even in dimly lit environments, large-aperture optical lenses are favored by many surveillance equipment manufacturers. However, traditional large-aperture lenses suffer from large size, low resolution, and high cost. Therefore, designing an optical lens that combines a large aperture with high resolution, low cost, and a compact size has become a trend in the lens market. Summary of the Invention

[0004] On the one hand, the present application provides an optical lens, which includes, in order from the object side to the image side along the optical axis: a first lens with negative optical power, whose object side surface is convex and whose image side surface is concave; a second lens with positive optical power, whose object side surface is concave and whose image side surface is convex; a third lens with positive optical power, whose object side surface is concave and whose image side surface is convex; a fourth lens with positive optical power, whose object side surface is convex and whose image side surface is convex; a fifth lens with negative optical power, whose object side surface is concave and whose image side surface is concave; a sixth lens with positive optical power, whose object side surface is convex and whose image side surface is convex; and a seventh lens with negative optical power, whose object side surface is convex and whose image side surface is concave. The optical lens can satisfy: -1≤F4 / F1≤-0.3, where F4 is the effective focal length of the fourth lens and F1 is the effective focal length of the first lens.

[0005] In one embodiment, the first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses made of plastic; and the fourth lens is a spherical lens made of glass.

[0006] In one embodiment, the optical lens further includes a stop located between the first lens and the second lens.

[0007] In one embodiment, the optical lens further includes a stop located at the image-side surface of the second lens.

[0008] In one embodiment, the optical lens further includes a stop located between the second lens and the third lens.

[0009] In one embodiment, the optical lens further includes a stop located on the image-side surface of the third lens.

[0010] In one embodiment, the optical lens may satisfy: 3≤TTL / F≤3.5, where TTL is the total optical length of the optical lens, and F is the total effective focal length of the optical lens.

[0011] In one embodiment, the optical lens may satisfy: 0.6≤BFL / F≤0.8, where BFL is the optical back focus of the optical lens, and F is the total effective focal length of the optical lens.

[0012] In one embodiment, the optical lens may satisfy: -12≤(F2+F3) / F1≤-7, where F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, and F1 is the effective focal length of the first lens.

[0013] In one embodiment, the optical lens may satisfy: -1.2≤F5 / F≤-0.8, where F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens.

[0014] In one embodiment, the optical lens may satisfy: 1.7≤F56 / F≤3.3, where F56 is the combined focal length of the fifth lens and the sixth lens, and F is the total effective focal length of the optical lens.

[0015] In one embodiment, the optical lens may satisfy: 0.2≤d12 / F≤0.5, where d12 is the distance on the optical axis from the center of the image side surface of the first lens to the center of the object side surface of the second lens, and F is the total effective focal length of the optical lens.

[0016] In one embodiment, the optical lens may satisfy: 0.1≤(d12+d34) / F56≤0.3, where d12 is the distance on the optical axis from the center of the image side surface of the first lens to the center of the object side surface of the second lens, d34 is the distance on the optical axis from the center of the image side surface of the third lens to the center of the object side surface of the fourth lens, and F56 is the combined focal length of the fifth lens and the sixth lens.

[0017] In one embodiment, the optical lens may satisfy: TTL≤22.5 mm and D≤9.1 mm, wherein TTL is the total optical length of the optical lens, and D is the maximum effective diameter of the optical lens.

[0018] In the exemplary embodiment of the present application, by reasonably setting the optical focal length, surface shape and main technical parameters of each lens, the optical lens provided by the present application can have at least one of the beneficial effects of ultra-large aperture, high resolution, small size, miniaturization, low cost, and no defocus at high and low temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0020] Figure 1 1 is a schematic structural diagram of an optical lens according to Example 1 of the present application;

[0021] Figure 2 is a schematic structural diagram of an optical lens according to Example 2 of the present application;

[0022] Figure 3 is a schematic structural diagram of an optical lens according to Example 3 of the present application;

[0023] Figure 4 is a schematic structural diagram of an optical lens according to Example 4 of the present application; and

[0024] Figure 5 It is a structural schematic diagram of the optical lens according to Example 5 of the present application. DETAILED DESCRIPTION

[0025] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0026] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0027] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0028] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0029] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0030] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0031] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] The features, principles and other aspects of the present application are described in detail below.

[0033] The optical lens according to an exemplary embodiment of the present application may include seven lenses having optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The seven lenses are arranged in sequence from the object side to the image side along the optical axis.

[0034] In an exemplary embodiment, the first lens may have negative power, its object-side surface may be convex, and its image-side surface may be concave; the second lens may have positive power, its object-side surface may be concave, and its image-side surface may be convex; the third lens may have positive power, its object-side surface may be concave, and its image-side surface may be convex; the fourth lens may have positive power, its object-side surface may be convex, and its image-side surface may be convex; the fifth lens may have negative power, its object-side surface may be concave, and its image-side surface may be concave; the sixth lens may have positive power, its object-side surface may be convex, and its image-side surface may be convex; and the seventh lens may have negative power, its object-side surface may be convex, and its image-side surface may be concave. This optical power and surface configuration of the present application is conducive to enabling the lens to have at least one of the following beneficial effects: ultra-large aperture (e.g., F-number up to 1.0), high resolution (e.g., pixels up to 8M), small size, and no defocusing at high and low temperatures.

[0035] In an exemplary embodiment, the optical lens according to the present application may further include a stop, which may be located between the first lens and the second lens; or located at the image side surface of the second lens; or located between the second lens and the third lens; or located at the image side surface of the third lens.

[0036] In an exemplary embodiment, the optical lens according to the present application may satisfy the following relationship: -1 ≤ F4 / F1 ≤ -0.3, where F4 is the effective focal length of the fourth lens element and F1 is the effective focal length of the first lens element. Meeting this condition, -1 ≤ F4 / F1 ≤ -0.3, facilitates correcting chromatic aberration and image aberration caused by light entering through the aperture, thereby improving the lens's resolving power.

[0037] In an exemplary embodiment, the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens may all be aspherical lenses made of plastic; and the fourth lens may be a spherical lens made of glass. Exemplarily, the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens may all be made of plastic, and the object side surface and the image side surface of the first lens, the second lens, the third lens, the fifth lens, the sixth lens and the seventh lens may all be aspherical. The fourth lens may be made of glass, and the object side surface and the image side surface of the fourth lens may both be spherical. The present application facilitates the correction of chromatic aberration by providing a glass-plastic hybrid optical architecture, so that the lens has the characteristics of small chromatic aberration, high resolution (such as up to 8M pixels), large aperture, good high and low temperature performance, low cost and lightweight.

[0038] In an exemplary embodiment, the optical lens according to the present application may satisfy the following condition: 3 ≤ TTL / F ≤ 3.5, where TTL is the total optical length of the optical lens, i.e., the distance on the optical axis from the center of the object-side surface of the first lens element to the center of the imaging surface of the optical lens, and F is the total effective focal length of the optical lens. Satisfying 3 ≤ TTL / F ≤ 3.5 effectively limits the total length of the lens, thereby facilitating miniaturization of the lens.

[0039] In an exemplary embodiment, the optical lens according to the present application may satisfy the following condition: 0.6 ≤ BFL / F ≤ 0.8, where BFL is the optical back focus of the optical lens, i.e., the distance on the optical axis from the center of the image-side surface of the seventh lens element to the center of the imaging plane of the optical lens, and F is the total effective focal length of the optical lens. Meeting 0.6 ≤ BFL / F ≤ 0.8 facilitates miniaturization while ensuring a sufficiently long optical back focus, thereby facilitating lens assembly.

[0040] In an exemplary embodiment, the optical lens according to the present application may satisfy the following: -12 ≤ (F2 + F3) / F1 ≤ -7, where F2 is the effective focal length of the second lens, F3 is the effective focal length of the third lens, and F1 is the effective focal length of the first lens. Satisfying -12 ≤ (F2 + F3) / F1 ≤ -7 allows for reasonable control of the light distribution between the first and third lenses, thereby reducing aberrations caused by incident light.

[0041] In exemplary embodiments, the optical lens according to the present application can satisfy the following conditions: -1.2 ≤ F5 / F ≤ -0.8, where F5 is the effective focal length of the fifth lens element and F is the total effective focal length of the optical lens. Meeting -1.2 ≤ F5 / F ≤ -0.8 facilitates balancing the lens's high and low temperature performance and lens aberrations, thereby facilitating high resolution and athermal design.

[0042] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 1.7 ≤ F56 / F ≤ 3.3, where F56 is the combined focal length of the fifth and sixth lenses, and F is the total effective focal length of the optical lens. By properly setting the combined focal length of the fifth and sixth lenses, the lens can maintain focus even over a wide temperature range (e.g., -40°C to 80°C).

[0043] In exemplary embodiments, the optical lens according to the present application may satisfy the following condition: 0.2 ≤ d12 / F ≤ 0.5, where d12 is the distance on the optical axis from the center of the image-side surface of the first lens to the center of the object-side surface of the second lens, and F is the total effective focal length of the optical lens. Meeting the condition 0.2 ≤ d12 / F ≤ 0.5 helps reduce the sensitivity of the lens to incident light, while also facilitating a compact structure between the lenses and facilitating lens miniaturization.

[0044] In an exemplary embodiment, the optical lens according to the present application may satisfy the following conditions: 0.1 ≤ (d12 + d34) / F56 ≤ 0.3, where d12 is the distance on the optical axis from the center of the image-side surface of the first lens to the center of the object-side surface of the second lens, d34 is the distance on the optical axis from the center of the image-side surface of the third lens to the center of the object-side surface of the fourth lens, and F56 is the combined focal length of the fifth and sixth lenses. Satisfying 0.1 ≤ (d12 + d34) / F56 ≤ 0.3 helps reduce the sensitivity of the lens to incident light, while also facilitating a compact structure between the lenses and facilitating lens miniaturization.

[0045] In an exemplary embodiment, the optical lens according to the present application can meet the following requirements: TTL ≤ 22.5 mm and D ≤ 9.1 mm, where TTL is the total optical length of the optical lens and D is the maximum effective diameter of the optical lens. Meeting these requirements helps to reduce the overall size of the lens.

[0046] In an exemplary embodiment, the optical lens according to the present application may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical lens with the characteristics of ultra-large aperture, high resolution, low cost, miniaturization, small size, no defocus at high and low temperatures, and high imaging quality. For example, the optical lens provided by the present application has an F number of up to 1.0, a pixel of up to 8M, and can produce clear images when used in a temperature range of -40°C to 80°C. The optical lens provided by the present application can be used in a low-light environment (i.e., a small luminous flux) and can produce clear images when used during the day and at night. The optical lens according to the above embodiment of the present application can use multiple lenses, such as the seven lenses described above. By reasonably allocating the optical power, surface shape, center thickness of each lens, and axial spacing between each lens, the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the optical lens more conducive to production and processing.

[0047] However, those skilled in the art will appreciate that the number of lenses comprising the optical lens may be varied to achieve the various results and advantages described herein without departing from the technical solutions claimed herein. For example, although the embodiments describe seven lenses as an example, the optical lens is not limited to including seven lenses. If desired, the optical lens may also include other numbers of lenses.

[0048] Specific embodiments of the optical lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0049] Example 1

[0050] The following reference Figure 1 The optical lens according to Example 1 of the present application is described. Figure 1 2 is a schematic structural diagram of an optical lens according to Example 1 of the present application.

[0051] like Figure 1 As shown, the optical lens includes, from the object side to the image side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter and / or a protective glass CG, and an imaging surface.

[0052] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has positive optical power, with a concave object-side surface and a convex image-side surface. The third lens L3 has positive optical power, with a concave object-side surface and a convex image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface. The fifth lens L5 has negative optical power, with a concave object-side surface and a concave image-side surface. The sixth lens L6 has positive optical power, with a convex object-side surface and a convex image-side surface. The seventh lens L7 has negative optical power, with a convex object-side surface and a concave image-side surface. Light from an object sequentially passes through each surface (i.e., sequentially passes through the object-side surface of the first lens L1 to the image-side surface of the filter and / or cover glass CG) and is ultimately imaged on the imaging surface, where an image sensor chip IMA may be provided.

[0053] Table 1 shows the basic parameters of the optical lens of Example 1, wherein the units of curvature radius and thickness / distance are all millimeters (mm).

[0054]

[0055] Table 1

[0056] In this example, surface 11 is the object-side surface of the first lens, and surface 12 is the image-side surface of the first lens. Surface 21 is the object-side surface of the second lens, and surface 22 is the image-side surface of the second lens. Surface 31 is the object-side surface of the third lens, and surface 32 is the image-side surface of the third lens. Surface 41 is the object-side surface of the fourth lens, and surface 42 is the image-side surface of the fourth lens. Surface 51 is the object-side surface of the fifth lens, and surface 52 is the image-side surface of the fifth lens. Surface 61 is the object-side surface of the sixth lens, and surface 62 is the image-side surface of the sixth lens. Surface 71 is the object-side surface of the seventh lens, and surface 72 is the image-side surface of the seventh lens. Surface 81 is the object-side surface of the filter, and surface 82 is the image-side surface of the filter.

[0057] In this example, the aperture STO may be located between the second lens L2 and the third lens L3. The distance TTL on the optical axis from the center of the object-side surface of the first lens to the center of the imaging surface of the optical lens is 21.393 mm, and the total effective focal length f of the optical lens is 6.829 mm.

[0058] In Example 1, the object-side surface and the image-side surface of any one of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all aspherical surfaces. The surface shape z of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0059]

[0060] Wherein, z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the quadratic constant of the aspheric surface; A4, A6, A8, A 10 、A 12 、A 14 、A 16 The aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders of the aspheric surface are given in Table 2 below. The quadratic surface constants k and the higher order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, 10 、A 12 、A 14 、A 16 .

[0061] Face number k A4 A6 A8 A10 A12 A14 A16 Surface 11 -0.626 -5.36E-03 -1.92E-04 2.42E-05 -5.53E-07 -2.78E-08 1.94E-09 -3.34E-11 Surface 12 -0.733 -7.64E-03 -3.47E-04 3.26E-05 2.11E-07 -1.63E-07 2.88E-09 2.38E-10 Surface 21 67.927 -5.31E-04 -1.01E-04 -5.38E-06 6.41E-07 -3.90E-08 -1.39E-09 1.81E-10 Surface 22 -63.201 -1.50E-04 -9.07E-05 -2.61E-06 2.07E-07 4.49E-09 -5.16E-10 6.02E-12 Surface 31 -40.099 2.65E-03 -5.98E-05 -9.85E-07 1.02E-07 -5.24E-10 -2.01E-10 -3.98E-12 Surface 32 -2.773 5.81E-04 3.46E-05 1.44E-06 8.12E-08 -8.79E-09 -3.02E-10 1.27E-11 Surface 51 -75.245 -2.88E-03 5.74E-05 1.51E-06 -4.05E-08 2.98E-10 -9.69E-12 -9.51E-13 Surface 52 -0.458 -4.43E-03 8.98E-05 3.60E-06 -1.36E-07 -1.44E-08 -1.72E-10 5.31E-11 Surface 61 19.966 2.02E-03 -1.36E-04 7.32E-06 -1.48E-07 -1.83E-08 -5.65E-10 6.57E-11 Surface 62 -4.92 -6.23E-04 1.67E-05 6.73E-07 9.19E-08 -5.88E-09 -1.01E-09 4.65E-11 Surface 71 -10.429 1.49E-03 -5.11E-04 3.71E-05 -1.61E-06 -6.40E-08 1.18E-08 -3.28E-10 Surface 72 -6.43 -4.91E-03 5.67E-04 -6.73E-05 3.80E-06 6.20E-08 -1.55E-08 5.68E-10

[0062] Table 2

[0063] Example 2

[0064] The following reference Figure 2 The optical lens according to Example 2 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to those in Example 1 will be omitted for the sake of brevity. Figure 2 A schematic structural diagram of an optical lens according to Example 2 of the present application is shown.

[0065] like Figure 2 As shown, the optical lens includes, from the object side to the image side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter and / or a protective glass CG, and an imaging surface.

[0066] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has positive optical power, with a concave object-side surface and a convex image-side surface. The third lens L3 has positive optical power, with a concave object-side surface and a convex image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface. The fifth lens L5 has negative optical power, with a concave object-side surface and a concave image-side surface. The sixth lens L6 has positive optical power, with a convex object-side surface and a convex image-side surface. The seventh lens L7 has negative optical power, with a convex object-side surface and a concave image-side surface. Light from an object sequentially passes through each surface (i.e., sequentially passes through the object-side surface of the first lens L1 to the image-side surface of the filter and / or cover glass CG) and is ultimately imaged on the imaging surface, where an image sensor chip IMA may be provided.

[0067] In this example, the aperture STO may be located between the second lens L2 and the third lens L3. The distance TTL on the optical axis from the center of the object-side surface of the first lens to the center of the imaging surface of the optical lens is 21.643 mm, and the total effective focal length f of the optical lens is 6.926 mm.

[0068] Table 3 shows the basic parameters of the optical lens of Example 2, where the units of curvature radius and thickness / distance are all in millimeters (mm). Table 4 shows the quadratic surface constant k and high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0069]

[0070] Table 3

[0071] Face number k A4 A6 A8 A10 A12 A14 A16 Surface 11 -0.708 -5.26E-03 -2.59E-04 2.35E-05 -5.07E-07 -2.63E-08 1.91E-09 -3.11E-11 Surface 12 -0.733 -7.35E-03 -3.86E-04 2.75E-05 2.47E-07 -1.41E-07 3.90E-09 6.15E-11 Surface 21 6.497 -1.35E-04 -4.24E-05 -3.66E-06 6.02E-07 -4.43E-08 -1.52E-09 1.58E-10 Surface 22 -29.678 -4.43E-06 -8.09E-05 -2.35E-06 2.06E-07 4.29E-09 -5.11E-10 7.88E-12 Surface 31 -13.123 2.47E-03 -5.86E-05 -7.41E-07 1.06E-07 -1.10E-09 -2.50E-10 -7.02E-12 Surface 32 -3.692 1.04E-03 5.00E-05 1.47E-06 5.82E-08 -1.00E-08 -3.21E-10 1.31E-11 Surface 51 -118.632 -2.68E-03 6.34E-05 1.72E-06 -5.14E-08 -1.77E-09 -1.10E-10 6.37E-12 Surface 52 -0.557 -4.64E-03 9.37E-05 4.27E-06 -9.20E-08 -1.22E-08 -1.78E-10 3.27E-11 Surface 61 23.259 1.68E-03 -1.20E-04 8.86E-06 -7.72E-08 -1.61E-08 -6.06E-10 5.89E-11 Surface 62 -4.866 -5.60E-04 1.58E-05 6.73E-07 1.12E-07 -6.08E-09 -9.04E-10 4.87E-11 Surface 71 -13.192 8.70E-04 -5.65E-04 3.76E-05 -1.51E-06 -6.61E-08 1.11E-08 -3.23E-10 Surface 72 -7.319 -5.03E-03 5.55E-04 -6.92E-05 3.73E-06 7.60E-08 -1.44E-08 4.21E-10

[0072] Table 4

[0073] Example 3

[0074] The following reference Figure 3 Describe the optical lens according to Example 3 of the present application. Figure 3 3 is a schematic structural diagram of an optical lens according to Example 3 of the present application.

[0075] like Figure 3 As shown, the optical lens includes, from the object side to the image side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter and / or a protective glass CG, and an imaging surface.

[0076] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has positive optical power, with a concave object-side surface and a convex image-side surface. The third lens L3 has positive optical power, with a concave object-side surface and a convex image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface. The fifth lens L5 has negative optical power, with a concave object-side surface and a concave image-side surface. The sixth lens L6 has positive optical power, with a convex object-side surface and a convex image-side surface. The seventh lens L7 has negative optical power, with a convex object-side surface and a concave image-side surface. Light from an object sequentially passes through each surface (i.e., sequentially passes through the object-side surface of the first lens L1 to the image-side surface of the filter and / or cover glass CG) and is ultimately imaged on the imaging surface, where an image sensor chip IMA may be provided.

[0077] In this example, the aperture stop STO can be located on the image-side surface of the second lens L2 (i.e., surface 22). The distance TTL on the optical axis from the center of the object-side surface of the first lens to the center of the imaging surface of the optical lens is 21.5 mm, and the total effective focal length f of the optical lens is 6.937 mm.

[0078] Table 5 shows the basic parameters of the optical lens of Example 3, where the units of curvature radius and thickness / distance are all in millimeters (mm). Table 6 shows the quadratic surface constant k and high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0079]

[0080] Table 5

[0081] Face number k A4 A6 A8 A10 A12 A14 A16 Surface 11 -0.682 -5.15E-03 -2.79E-04 2.43E-05 -4.48E-07 -2.68E-08 1.75E-09 -3.04E-11 Surface 12 -0.742 -7.13E-03 -4.17E-04 2.94E-05 2.69E-07 -1.38E-07 4.34E-09 4.83E-11 Surface 21 23.001 1.79E-04 -1.90E-05 -4.91E-06 5.64E-07 -3.74E-08 -9.07E-10 1.58E-10 Surface 22 -23.440 5.34E-05 -7.71E-05 -2.36E-06 2.02E-07 4.02E-09 -5.37E-10 8.61E-12 Surface 31 -11.917 2.53E-03 -5.08E-05 -4.48E-07 9.72E-08 -1.95E-09 -2.44E-10 -3.73E-12 Surface 32 -3.448 1.10E-03 5.32E-05 1.34E-06 5.89E-08 -9.59E-09 -3.16E-10 1.47E-11 Surface 51 -217.699 -2.55E-03 5.37E-05 1.76E-06 -2.41E-08 -6.23E-10 -1.16E-10 3.03E-12 Surface 52 -0.651 -4.80E-03 1.09E-04 5.12E-06 -6.87E-08 -1.18E-08 -2.07E-10 2.28E-11 Surface 61 26.656 1.92E-03 -1.23E-04 9.06E-06 -4.17E-08 -1.55E-08 -6.93E-10 4.47E-11 Surface 62 -5.221 -2.04E-04 3.10E-06 6.73E-07 5.41E-08 -3.08E-09 -7.92E-10 3.79E-11 Surface 71 -13.762 1.03E-03 -5.75E-04 3.85E-05 -1.45E-06 -7.19E-08 9.83E-09 -2.23E-10 Surface 72 -7.049 -4.96E-03 5.36E-04 -6.73E-05 3.78E-06 5.95E-08 -1.44E-08 4.68E-10

[0082] Table 6

[0083] Example 4

[0084] The following reference Figure 4 Describe the optical lens according to Example 4 of the present application. Figure 4 A schematic structural diagram of an optical lens according to Example 4 of the present application is shown.

[0085] like Figure 4 As shown, the optical lens includes, from the object side to the image side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter and / or a protective glass CG, and an imaging surface.

[0086] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has positive optical power, with a concave object-side surface and a convex image-side surface. The third lens L3 has positive optical power, with a concave object-side surface and a convex image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface. The fifth lens L5 has negative optical power, with a concave object-side surface and a concave image-side surface. The sixth lens L6 has positive optical power, with a convex object-side surface and a convex image-side surface. The seventh lens L7 has negative optical power, with a convex object-side surface and a concave image-side surface. Light from an object sequentially passes through each surface (i.e., sequentially passes through the object-side surface of the first lens L1 to the image-side surface of the filter and / or cover glass CG) and is ultimately imaged on the imaging surface, where an image sensor chip IMA may be provided.

[0087] In this example, the aperture stop STO may be located on the image-side surface of the third lens element L3 (i.e., surface 32). The distance TTL on the optical axis from the center of the object-side surface of the first lens element to the center of the imaging surface of the optical lens element is 22.219 mm, and the total effective focal length f of the optical lens element is 6.87 mm.

[0088] Table 7 shows the basic parameters of the optical lens of Example 4, where the units of curvature radius and thickness / distance are all in millimeters (mm). Table 8 shows the quadratic surface constant k and high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0089]

[0090] Table 7

[0091] Face number k A4 A6 A8 A10 A12 A14 A16 Surface 11 -0.689 -5.35E-03 -2.33E-04 2.44E-05 -5.16E-07 -2.75E-08 1.90E-09 -3.28E-11 Surface 12 -0.735 -7.40E-03 -3.65E-04 2.90E-05 1.86E-07 -1.41E-07 4.08E-09 3.78E-11 Surface 21 15.275 -2.35E-04 -5.89E-05 -5.27E-06 5.95E-07 -3.78E-08 -1.22E-09 1.22E-10 Surface 22 -162.177 1.83E-05 -7.97E-05 -2.44E-06 1.95E-07 4.18E-09 -4.84E-10 7.01E-12 Surface 31 -20.407 2.60E-03 -5.98E-05 -8.92E-07 1.08E-07 -5.51E-10 -2.04E-10 -1.44E-12 Surface 32 -3.057 7.50E-04 4.45E-05 1.66E-06 8.07E-08 -8.50E-09 -2.67E-10 1.30E-11 Surface 51 -320.520 -2.59E-03 5.13E-05 1.55E-06 -2.34E-08 -8.94E-11 -9.24E-11 2.03E-12 Surface 52 -0.512 -4.59E-03 1.01E-04 4.59E-06 -8.58E-08 -1.26E-08 -2.23E-10 3.51E-11 Surface 61 18.679 2.19E-03 -1.20E-04 8.69E-06 -7.63E-08 -1.62E-08 -6.09E-10 5.18E-11 Surface 62 -5.568 -2.58E-04 6.36E-07 6.73E-07 5.53E-08 -3.17E-09 -8.07E-10 3.59E-11 Surface 71 -16.892 1.154E-03 -6.07E-04 3.75E-05 -1.35E-06 -7.05E-08 9.81E-09 -2.29E-10 Surface 72 -8.116 -4.83E-03 4.94E-04 -6.94E-05 4.04E-06 6.95E-08 -1.62E-08 5.11E-10

[0092] Table 8

[0093] Example 5

[0094] The following reference Figure 5 Describe the optical lens according to Example 5 of the present application. Figure 5 A structural schematic diagram of an optical lens according to Example 5 of the present application is shown.

[0095] like Figure 5As shown, the optical lens includes, from the object side to the image side, a first lens L1, a second lens L2, an aperture STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, a filter and / or a protective glass CG, and an imaging surface.

[0096] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has positive optical power, with a concave object-side surface and a convex image-side surface. The third lens L3 has positive optical power, with a concave object-side surface and a convex image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface. The fifth lens L5 has negative optical power, with a concave object-side surface and a concave image-side surface. The sixth lens L6 has positive optical power, with a convex object-side surface and a convex image-side surface. The seventh lens L7 has negative optical power, with a convex object-side surface and a concave image-side surface. Light from an object sequentially passes through each surface (i.e., sequentially passes through the object-side surface of the first lens L1 to the image-side surface of the filter and / or cover glass CG) and is ultimately imaged on the imaging surface, where an image sensor chip IMA may be provided.

[0097] In this example, the aperture STO may be located between the first lens L1 and the second lens L2. The distance TTL on the optical axis from the center of the object side surface of the first lens to the center of the imaging surface of the optical lens is 21.926 mm, and the total effective focal length f of the optical lens is 6.86 mm.

[0098] Table 9 shows the basic parameters of the optical lens of Example 5, where the units of curvature radius and thickness / distance are all in millimeters (mm). Table 10 shows the quadratic surface constant k and high-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 , wherein each aspheric surface shape can be defined by formula (1) given in the above embodiment 1.

[0099]

[0100] Table 9

[0101] Face number k A4 A6 A8 A10 A12 A14 A16 Surface 11 -0.611 -5.36E-03 -1.88E-04 2.40E-05 -5.68E-07 -2.76E-08 1.98E-09 -3.53E-11 Surface 12 -0.719 -7.28E-03 -3.22E-04 3.04E-05 7.63E-08 -1.47E-07 4.80E-09 4.76E-11 Surface 21 -581.671 1.26E-04 -8.55E-05 -5.25E-06 7.06E-07 -3.52E-08 -1.70E-09 1.44E-10 Surface 22 -232.319 1.06E-04 -8.58E-05 -2.65E-06 2.07E-07 4.59E-09 -5.23E-10 6.30E-12 Surface 31 -14.508 2.55E-03 -5.87E-05 -8.86E-07 1.00E-07 -6.86E-10 -2.00E-10 -5.50E-12 Surface 32 -2.938 6.49E-04 3.64E-05 1.38E-06 7.59E-08 -9.00E-09 -3.04E-10 1.376E-11 Surface 51 -225.377 -2.68E-03 5.78E-05 1.67E-06 -2.88E-08 1.39E-10 -5.56E-11 5.379E-13 Surface 52 -0.453 -4.52E-03 1.00E-04 4.68E-06 -8.72E-08 -1.32E-08 -1.88E-10 5.191E-11 Surface 61 19.056 2.20E-03 -1.28E-04 7.88E-06 -1.04E-07 -1.57E-08 -4.92E-10 5.81E-11 Surface 62 -5.565 -2.94E-04 1.32E-05 6.73E-07 5.58E-08 -6.51E-09 -9.76E-10 4.98E-11 Surface 71 -13.499 1.82E-03 -5.23E-04 3.77E-05 -1.58E-06 -7.27E-08 1.09E-08 -2.85E-10 Surface 72 -7.114 -4.49E-03 5.80E-04 -6.97E-05 3.65E-06 6.76E-08 -1.45E-08 4.72E-10

[0102] Table 10

[0103] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 11.

[0104] Conditional formula / Example 1 2 3 4 5 TTL / F 3.279 3.125 3.099 3.235 3.195 BFL / F 0.711 0.672 0.675 0.665 0.695 (F2+F3) / F1 -7.480 -9.534 -7.311 -11.722 -7.408 F4 / F1 -0.804 -0.405 -0.502 -0.601 -0.750 F5 / F -0.936 -0.908 -0.947 -1.033 -1.004 F56 / F 1.894 3.093 2.536 2.448 1.866 d12 / F 0.297 0.338 0.365 0.273 0.292 (d12+d34) / F56 0.221 0.114 0.149 0.118 0.165

[0105] Table 11

[0106] The present application also provides an imaging device, wherein the electronic photosensitive element thereof can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be a standalone imaging device of a monitoring system, or an imaging module integrated into a mobile electronic device such as a monitoring system. The imaging device is equipped with the optical lens described above.

[0107] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An optical lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave; a second lens having positive refractive power, whose object-side surface is concave and whose image-side surface is convex; The third lens has positive optical power, its object-side surface is concave and its image-side surface is convex; a fourth lens element having positive optical power, with a convex object-side surface and a convex image-side surface; a fifth lens element having negative optical power, with its object-side surface being concave and its image-side surface being concave; a sixth lens element having positive optical power, with its object-side surface being convex and its image-side surface being convex; and a seventh lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; Wherein, the number of lenses having optical power of the optical lens is seven; The optical lens satisfies the following conditions: -1≤F4 / F1≤-0.3, -12≤(F2+F3) / F1≤-7, F4 is the effective focal length of the fourth lens, F1 is the effective focal length of the first lens, F2 is the effective focal length of the second lens, and F3 is the effective focal length of the third lens.

2. The optical lens according to claim 1, wherein: The first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical lenses made of plastic; and The fourth lens is a spherical lens made of glass.

3. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies: 3≤TTL / F≤3.5, wherein TTL is the total optical length of the optical lens, and F is the total effective focal length of the optical lens.

4. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following: 0.6≤BFL / F≤0.8, wherein BFL is the optical back focus of the optical lens, and F is the total effective focal length of the optical lens.

5. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies: -1.2≤F5 / F≤-0.8, wherein F5 is the effective focal length of the fifth lens, and F is the total effective focal length of the optical lens.

6. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies: 1.7≤F56 / F≤3.3, wherein F56 is the combined focal length of the fifth lens and the sixth lens, and F is the total effective focal length of the optical lens.

7. The optical lens according to claim 1 or 2, characterized in that: The optical lens satisfies the following: 0.2≤d12 / F≤0.5, d12 is the distance from the center of the image side surface of the first lens to the center of the object side surface of the second lens on the optical axis, and F is the total effective focal length of the optical lens.

8. The optical lens according to claim 1 or 2, wherein: The optical lens satisfies the following: 0.1≤(d12+d34) / F56≤0.3, where d12 is the distance from the center of the image-side surface of the first lens to the center of the object-side surface of the second lens on the optical axis, d34 is the distance from the center of the image-side surface of the third lens to the center of the object-side surface of the fourth lens on the optical axis, and F56 is the combined focal length of the fifth lens and the sixth lens.

9. The optical lens according to claim 1 or 2, wherein: The optical lens satisfies the following requirements: TTL≤22.5 mm and D≤9.1 mm, wherein TTL is the total optical length of the optical lens and D is the maximum effective diameter of the optical lens.

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