Optical lens

Abstract

The utility model provides an optical lens. The optical lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side, at least the fourth lens is a purple light and infrared light absorption lens, and the purple light and infrared light absorption lens is used for blocking at least part of purple light and infrared light; the length DP10, penetrating through the fourth lens, of the chief light of the 1.0 view field and the length DP0, penetrating through the fourth lens, of the chief light of the central view field meet the following formula: 1.2 lt; dP10 / DP01t; and 1.4. The seven-piece optical lens solves the problem that the imaging quality is influenced by purple light and infrared light in a seven-piece optical lens in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging equipment, in particular to an optical lens. Background Art

[0002] In recent years, with the development of optical technology, people have put forward higher requirements for the imaging quality of optical lenses. However, in actual application, the imaging quality of optical lenses is often affected by light of different bands, especially long-wave infrared light and short-wave ultraviolet light. In order to meet the shooting needs of daily life, existing optical lenses usually adopt a seven-lens structure. The increase in the number of lenses will affect and increase the reflection and diffraction of light inside the lens, especially infrared light and ultraviolet light have a serious impact on the image surface, greatly affecting the imaging quality.

[0003] That is to say, the seven-element optical lens in the prior art has the problem that ultraviolet light and infrared light affect the imaging quality. Utility Model Content

[0004] The main purpose of the utility model is to provide an optical lens to solve the problem that the ultraviolet light and infrared light affect the imaging quality of the seven-piece optical lens in the prior art.

[0005] In order to achieve the above-mentioned object, the utility model provides an optical lens, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the image side, wherein at least the fourth lens is a violet infrared light absorption lens, and the violet infrared light absorption lens is used to block at least part of violet light and infrared light; the length DP10 of the main light of the 1.0 field of view passing through the fourth lens and the length DP0 of the main light of the central field of view passing through the fourth lens satisfy: 1.2 <DP10 / DP0<1.4。

[0006] Further, the object-side surface and the image-side surface of the central portion of the fourth lens are both flat surfaces, and the object-side surface and the image-side surface of the edge portion of the fourth lens are both curved surfaces.

[0007] Furthermore, the object side surface and the image side surface of the edge portion of the fourth lens are aspherical surfaces, and the transmittance T3540 of the fourth lens for incident light in the 350nm to 400nm band satisfies: T3540<5%, and the transmittance T7075 of the fourth lens for incident light in the 700nm to 750nm band satisfies: T7075<15%.

[0008] Furthermore, an effective radius of the object-side surface of the fourth lens is greater than an effective radius of the object-side surface of the third lens, and an effective radius of the object-side surface of the fourth lens is greater than an effective radius of the image-side surface of the third lens.

[0009] Furthermore, the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT32 of the image side surface of the third lens satisfy: 1.0 <DT41 / DT32<1.1。

[0010] Furthermore, the effective radius of the object side surface of the fifth lens is greater than the effective radius of the object side surface of the fourth lens, and the effective radius of the object side surface of the fifth lens is greater than the effective radius of the image side surface of the fourth lens. The maximum effective radius DT51 of the object side surface of the fifth lens and the maximum effective radius DT42 of the image side surface of the fourth lens satisfy: DT51 / DT42≥1.3.

[0011] Furthermore, a maximum effective radius DT51 of the object-side surface of the fifth lens and a maximum effective radius DT42 of the image-side surface of the fourth lens satisfy: 1.4>DT51 / DT42≥1.3.

[0012] Furthermore, the length DP10 of the chief ray of the 1.0 field of view through the fourth lens, the length DP09 of the chief ray of the 0.9 field of view through the fourth lens, the length DP08 of the chief ray of the 0.8 field of view through the fourth lens, the length DP07 of the chief ray of the 0.7 field of view through the fourth lens, and the length DP06 of the chief ray of the 0.6 field of view through the fourth lens satisfy: DP10>DP09>DP08>DP07>DP06.

[0013] Further, the length DP0 of the main light of the central field of view passing through the fourth lens and the average DP69 of the length DP09 of the main light of the 0.9 field of view passing through the fourth lens, the length DP08 of the main light of the 0.8 field of view passing through the fourth lens, the length DP07 of the main light of the 0.7 field of view passing through the fourth lens, and the length DP06 of the main light of the 0.6 field of view passing through the fourth lens satisfy the following: 1.1 <DP69 / DP0<1.3。

[0014] Further, the center thickness of the fourth lens is less than the edge thickness of the fourth lens, and the transmittance T5065 of the fourth lens for incident light in the wavelength band of 500nm to 650nm satisfies: T5065>85%.

[0015] By applying the technical solution of the utility model, the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in order from the object side to the image side, wherein at least the fourth lens is a violet infrared light absorption lens, and the violet infrared light absorption lens is used to block at least part of violet light and infrared light; the length DP10 of the main light of the 1.0 field of view passing through the fourth lens and the length DP0 of the main light of the central field of view passing through the fourth lens satisfy the following: 1.2 <DP10 / DP0<1.4。

[0016] The optical lens of the present application is composed of seven lenses from the first lens to the seventh lens. By setting the fourth lens as a violet and infrared light absorbing lens, most of the violet light and infrared light can be effectively blocked by the fourth lens, thereby reducing the entry of violet light in the short-wave band and infrared light in the long-wave band into the rear, which affects the imaging quality. When DP10 / DP0 < 1.2, the length of the chief ray of the 1.0 field of view passing through the fourth lens is short, resulting in insufficient absorption of violet light and infrared light in the edge field of view by the fourth lens, which easily increases the color deviation of the imaging. When DP10 / DP0 > 1.4, the length of the chief ray of the 1.0 field of view passing through the fourth lens is long, resulting in a lower color saturation of the imaging. Therefore, the present application restricts 1.2 < DP10 / DP0 < 1.4 and adjusts the curvature of the object side and image side of the fourth lens in a timely manner to improve the imaging quality. Specifically, when DP10 / DP0 is close to 1.3, the imaging quality is optimal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0018] Figure 1 The dimension marking diagram of the optical lens of an alternative embodiment of the present utility model is shown;

[0019] Figure 2 The structural schematic diagram of the optical lens of Embodiment 1 of the present utility model is shown;

[0020] Figure 3 The structural schematic diagram of the optical lens of Embodiment 2 of the present utility model is shown;

[0021] Figure 4 Shows Figure 2 and Figure 3 The transmittance curves of the optical lens in

[0022] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0023] E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; E6, sixth lens; S11, object-side surface of the sixth lens; S12, image-side surface of the sixth lens; E7, seventh lens; S13, object-side surface of the seventh lens; S14, image-side surface of the seventh lens; E8, protective glass; S15, imaging surface. DETAILED DESCRIPTION

[0024] 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 utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In this text, 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 judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in this field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database in optical software) is used to judge the convexity and concavity. Taking the incident light side as an example, 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; taking the outgoing light side as an example, 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.

[0030] In order to solve the problem that the imaging quality of the existing seven-piece optical lens is affected by violet light and infrared light, the present utility model provides an optical lens.

[0031] As Figures 1 to 3 shown, in an alternative embodiment of the present application, the optical lens sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from the object side to the image side. Among them, at least the fourth lens is a violet and infrared light absorbing lens, and the violet and infrared light absorbing lens is used to block at least part of the violet light and infrared light; the length DP10 of the chief ray of the 1.0 field of view passing through the fourth lens and the length DP0 of the chief ray of the central field of view passing through the fourth lens satisfy: 1.2 < DP10 / DP0 < 1.4.

[0032] The optical lens of the present application is composed of seven lenses from the first lens to the seventh lens. By setting the fourth lens as a violet and infrared light absorbing lens, most of the violet light and infrared light can be effectively blocked by the fourth lens, thereby reducing the violet light in the short-wave band and the infrared light in the long-wave band from entering the rear and affecting the imaging quality. When DP10 / DP0 < 1.2, the length of the chief ray of the 1.0 field of view passing through the fourth lens is short, resulting in the violet light and infrared light in the edge field of view not being fully absorbed by the fourth lens, which is likely to increase the color deviation of the imaging. When DP10 / DP0 > 1.4, the length of the chief ray of the 1.0 field of view passing through the fourth lens is long, resulting in a lower color saturation of the imaging. Therefore, by restricting 1.2 < DP10 / DP0 < 1.4, the curvatures of the object side and the image side of the fourth lens can be adjusted in a timely manner to improve the imaging quality. Specifically, when DP10 / DP0 is close to 1.3, the imaging quality is optimal.

[0033] In an alternative embodiment of the present application, for the violet and infrared light absorbing lens, DP10 / DP0 = 1.2. In another alternative embodiment of the present application, DP10 / DP0 = 1.4.

[0034] It should be noted that the above-mentioned violet infrared light absorption lens is a plastic lens doped with different chemical substances. This setting is to enable the lens to have a good blocking effect on the violet light in the short-wave band and the infrared light in the long-wave band, while not affecting the passage of the imaging light in the main band, which is conducive to ensuring the imaging stability and improving the imaging quality.

[0035] It should also be noted that the above-mentioned ultraviolet infrared light absorbing lens is formed by compression molding. The plastic is melted by heating and pressurizing and molded according to the shape of the lens mold. This not only reduces production costs, but also effectively ensures that the shrinkage rate of the ultraviolet infrared light absorbing lens during the molding process is small, thereby ensuring the uniformity of the lens.

[0036] It should also be noted that in the specific embodiment of the present application, only the fourth lens is set as a purple infrared light absorption lens. However, in other optional embodiments, one or more of the first to seventh lenses can be set as a purple infrared light absorption lens, which can be set according to actual needs.

[0037] Specifically, the object side surface and the image side surface of the central part of the fourth lens are both planes, the object side surface and the image side surface of the edge part of the fourth lens are both curved surfaces, and the central part and the edge part have a smooth transition, the central part is the part close to the optical axis, and the edge part is the part far from the optical axis. The purpose of this arrangement is to ensure the stability of light when it is incident and avoid reflection and generation of strong light areas.

[0038] Specifically, the object side surface and the image side surface of the edge portion of the fourth lens are aspherical surfaces, and the transmittance T3540 of the fourth lens for incident light in the 350nm to 400nm band satisfies: T3540<5%, so as to ensure that most short-wave light can be intercepted by the fourth lens, and the transmittance T7075 of the fourth lens for incident light in the 700nm to 750nm band satisfies: T7075<15%, so as to ensure that most long-wave light is intercepted by the fourth lens, thereby reducing the influence of light in the purple light band and the infrared light band on the imaging quality, ensuring that the color saturation of the final image is high, which is beneficial to improving the imaging quality of the optical lens.

[0039] In this embodiment, the effective radius of the object side surface of the fourth lens is greater than the effective radius of the object side surface of the third lens, and the effective radius of the object side surface of the fourth lens is greater than the effective radius of the image side surface of the third lens. And the following condition is satisfied between the maximum effective radius DT41 of the object side surface of the fourth lens and the maximum effective radius DT32 of the image side surface of the third lens: 1.0 < DT41 / DT32 < 1.1. By controlling the effective radius of the object side surface of the fourth lens, the effective surface area of the fourth lens can be effectively increased, so that the doped chemical substances can be more evenly distributed on the surface of the fourth lens, thereby improving the surface shape stability and light absorption stability of the fourth lens, and ensuring that the effective radius of the object side surface of the fourth lens is greater than the effective radius of any side surface of the third lens, ensuring that most of the ultraviolet light and red light emitted from the third lens can be absorbed by the fourth lens, and avoiding light leakage. Further restricting this conditional expression can ensure that most of the violet light and infrared light emitted from the third lens can be received and absorbed by the fourth lens, avoiding the situation where short-wave and long-wave light rays affect the subsequent imaging quality. In an alternative embodiment of the present application, DT41 / DT32 = 1.0. In another alternative embodiment of the present application, DT41 / DT32 = 1.1.

[0040] In this embodiment, the effective radius of the object side surface of the fifth lens is greater than the effective radius of the object side surface of the fourth lens, and the effective radius of the object side surface of the fifth lens is greater than the effective radius of the image side surface of the fourth lens, and the following condition is satisfied between the maximum effective radius DT51 of the object side surface of the fifth lens and the maximum effective radius DT42 of the image side surface of the fourth lens: DT51 / DT42 ≥ 1.3. By controlling the effective radii of the object side surface and the image side surface of the fourth lens and the effective radius of the object side surface of the fifth lens, the effective radius of the object side surface of the fifth lens can be made greater than the effective radius of any side surface of the fourth lens, ensuring that all the effective light rays emitted from the fourth lens can be received by the object side surface of the fifth lens and finally converge on the imaging surface. By restricting DT51 / DT42 ≥ 1.3, the internal sensitivity of the fourth lens and the fifth lens is reduced, the passing rate of the effective light rays is increased, and the ratio of the total length of the optical lens to the imaging surface is restricted to ensure the forming feasibility of the optical lens. Preferably, 1.4 > DT51 / DT42 ≥ 1.3. In an alternative embodiment of the present application, DT51 / DT42 = 1.4. In another alternative embodiment of the present application, DT51 / DT42 = 1.3.

[0041] In this embodiment, the lengths DP10 of the chief ray of the 1.0 field of view passing through the fourth lens, DP09 of the 0.9 field of view passing through the fourth lens, DP08 of the 0.8 field of view passing through the fourth lens, DP07 of the 0.7 field of view passing through the fourth lens, and DP06 of the 0.6 field of view passing through the fourth lens satisfy: DP10 > DP09 > DP08 > DP07 > DP06. Such a setting can constrain the lengths of the chief rays of the 0.6 field of view to 1.0 field of view passing through the fourth lens to increase steadily, which is beneficial to ensuring the imaging size and can optimize the size of the optical lens.

[0042] In this embodiment, the length DP0 of the chief ray of the central field of view passing through the fourth lens, the average value DP69 of DP09 of the 0.9 field of view passing through the fourth lens, DP08 of the 0.8 field of view passing through the fourth lens, DP07 of the 0.7 field of view passing through the fourth lens, and DP06 of the 0.6 field of view passing through the fourth lens satisfy: 1.1 < DP69 / DP0 < 1.3. By constraining this conditional expression and controlling the lengths of the chief rays of the 0.6 field of view to 0.9 field of view passing through the fourth lens, the average length of the chief rays of the 0.6 field of view to 0.9 field of view passing through the fourth lens and the length of the chief ray of the central field of view passing through the fourth lens are controlled within a reasonable range, which helps to correct off-axis aberration and improve imaging quality. In an alternative embodiment of the present application, DP69 / DP0 = 1.1. In another alternative embodiment of the present application, DP69 / DP0 = 1.3.

[0043] In this embodiment, the central thickness of the fourth lens is less than the edge thickness of the fourth lens. By separately controlling the central thickness and the edge thickness of the fourth lens, the refraction and reflection of light inside the fourth lens can be effectively enhanced, the ability of the fourth lens to correct chromatic aberration is enhanced, and at the same time, the structural uniformity of the fourth lens is ensured, which helps the forming of the lens and improves the production yield. The transmittance T5065 of the fourth lens for incident light in the wavelength range of 500 nm to 650 nm satisfies: T5065 > 85%. Such a setting is beneficial to ensuring a relatively high transmittance of the fourth lens for incident light in the wavelength range of 500 nm to 600 nm, so as to meet the light input of the optical lens in the conventional wavelength range, improve the imaging brightness, ensure that the imaging of the optical lens is clearer and brighter, and at the same time is more conducive to the focusing of light.

[0044] In this embodiment, the first lens has positive focal power, and its object side surface is convex and its image side surface is concave. The first lens is set to have positive focal power to ensure that the first lens can converge the incident light and ensure the effective focal length of the first lens; by controlling the shape of the object side surface and the image side surface of the first lens to ensure the radius of curvature of the object side surface and the image side surface of the first lens, it is helpful to improve the exit state of the light and ensure the propagation path of the light inside the optical lens. The second lens has positive focal power or negative focal power; the third lens has positive focal power or negative focal power; the fourth lens has positive focal power or negative focal power; the fifth lens has positive focal power or negative focal power; the sixth lens has positive focal power or negative focal power; the seventh lens has positive focal power or negative focal power. Specifically, in the optional embodiment of the present application, the focal power of the second lens to the seventh lens is determined by the imaging effect required by the optical lens and the coordination of the focal power of each lens in the optical system, which is not restricted in the present application.

[0045] Optionally, the optical lens may further include a protective glass for protecting a photosensitive element located on the imaging surface.

[0046] The optical lens in the present application may use multiple lenses, such as the seven lenses mentioned above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0047] 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 seven lenses are described as an example in the embodiment, the optical lens is not limited to including seven lenses. If necessary, the optical lens may also include other numbers of lenses.

[0048] Figure 1 A schematic diagram of the structural dimensions of an optical lens of the present application is shown, wherein Figure 1 The parameters of DP06, DP07, DP08, DP09, DP10, DT32, DT41, DT42, and DT51 are marked in the figure to clearly and intuitively understand the meaning of the parameters. In order to facilitate the optical lens and the specific surface type, these parameters will no longer be reflected in the drawings when the specific embodiments are described later.

[0049] 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.

[0050] It should be noted that any one of the following embodiments 1 and 2 is applicable to all implementation methods of the present application.

[0051] Embodiment 1

[0052] like Figure 2 As shown, the optical lens of embodiment 1 is described. Figure 2 A schematic structural diagram of an optical lens according to the first embodiment is shown.

[0053] like Figure 2 As shown, the optical lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a protective glass E8 and an imaging surface S15.

[0054] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is a plane, and the image side surface S8 of the fourth lens is a plane. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave.

[0055] Table 1 shows the basic structural parameters of the optical lens of Example 1, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0056] Face number Surface type Radius of curvature thickness OBJ Spherical endless endless S1 Aspheric 1.8217 0.8129 S2 Aspheric 12.8491 0.1102 STO Spherical endless -0.0892 S3 Aspheric 12.8310 0.2238 S4 Aspheric 4.3659 0.3322 S5 Aspheric -24.0438 0.2935 S6 Aspheric -57.3180 0.1980 S7 Aspheric endless 0.2767 S8 Aspheric endless 0.5464 S9 Aspheric 27.0943 0.3800 S10 Aspheric 12.8676 0.4063 S11 Aspheric 2.4711 0.4200 S12 Aspheric 8.3879 0.6053 S13 Aspheric -3.1631 0.4121 S14 Aspheric 6.5877 0.3575 S15 Spherical endless 0.2100 S16 Spherical endless 0.3837 S17 Spherical endless 0.0000

[0057] Table 1

[0058] Table 2 shows the structural parameters of the optical lens of Example 1, all in millimeters (mm).

[0059] Parameters / Examples Embodiment 1 DP0 0.283 DP06 0.345 DP07 0.356 DP08 0.368 DP09 0.381 DP10 0.393 DT32 1.3 DT41 1.421 DT42 1.69 DT51 2.24

[0060] Table 2

[0061] Embodiment 2

[0062] like Figure 3As shown, the optical lens of the second embodiment is described. Figure 3 A schematic structural diagram of an optical lens according to a second embodiment is shown.

[0063] like Figure 3 As shown, the optical lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a protective glass E8 and an imaging surface S15.

[0064] In this embodiment, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has positive focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has negative focal power, the object side surface S7 of the fourth lens is a plane, and the image side surface S8 of the fourth lens is a plane. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The sixth lens E6 has positive focal power, the object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The seventh lens E7 has negative focal power, the object side surface S13 of the seventh lens is concave, and the image side surface S14 of the seventh lens is concave.

[0065] Table 3 shows the basic structural parameters of the optical lens of Example 2, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0066] Face number Surface type Radius of curvature thickness OBJ Spherical endless endless S1 Aspheric 2.1658 0.8373 S2 Aspheric 8.0445 0.2007 STO Spherical endless -0.1019 S3 Aspheric 9.2863 0.2300 S4 Aspheric 4.5437 0.3270 S5 Aspheric 110.6436 0.3493 S6 Aspheric -14.0231 0.1912 S7 Aspheric endless 0.2827 S8 Aspheric endless 0.7137 S9 Aspheric 41.1734 0.4235 S10 Aspheric 4.1157 0.1929 S11 Aspheric 1.7625 0.5673 S12 Aspheric 16.9210 0.8836 S13 Aspheric -31.3354 0.4200 S14 Aspheric 2.3718 0.3965 S15 Spherical endless 0.2100 S16 Spherical endless 0.4262 S17 Spherical endless 0.0000

[0067] Table 3

[0068] Table 4 shows the structural parameters of the optical lens of Example 2, all in millimeters (mm).

[0069] Parameters / Examples Embodiment 2 DP0 0.277 DP06 0.296 DP07 0.311 DP08 0.317 DP09 0.321 DP10 0.344 DT32 1.167 DT41 1.188 DT42 1.348 DT51 1.753

[0070] Table 4

[0071] In summary, the first embodiment and the second embodiment respectively satisfy the relationship shown in Table 5.

[0072] Conditional / Example Embodiment 1 Embodiment 2 DP10 / DP0 1.39 1.24 DT41 / DT32 1.09 1.02 DT51 / DT42 1.33 1.30 DP69 / DP0 1.28 1.12

[0073] Table 5

[0074] Table 6 shows the transmittance of the optical lens of Example 1 and Example 2 in different bands. The curve of the transmittance of the optical lens of Example 1 and Example 2 in different bands is obtained by fitting according to the data in Table 6. Figure 4 .

[0075]

[0076]

[0077] Table 6

[0078] Table 7 shows the transmittance of the optical lens of Example 1 and Example 2 in different wavelength ranges. Among them, the average transmittance of the optical lens for incident light in the 350nm to 400nm band is A, the average transmittance of the optical lens for incident light in the 700nm to 750nm band is B, and the transmittance of the optical lens for incident light in the 500nm to 650nm band is C.

[0079] Parameters / Examples Embodiment 1 Embodiment 2 A(％) 3.12 2.00 B(％) 1.40 3.73 C(％) 89.51 89.85

[0080] Table 7

[0081] From Table 6, Table 7 and Figure 4 It can be seen that the optical lens of the present application has a good blocking effect on incident light in the 350nm to 400nm band and incident light in the 700nm to 750nm band, thereby ensuring that most of the ultraviolet light and infrared light are blocked, preventing ultraviolet light and infrared light from entering the imaging surface of the optical lens and affecting the imaging quality, thereby ensuring the imaging quality.

[0082] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0083] 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.

[0084] 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.

[0085] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An optical lens, characterized in that: The lens comprises, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. Wherein, at least the fourth lens is a violet infrared light absorption lens, and the violet infrared light absorption lens is used to block at least part of the violet light and infrared light; 1.0 The length DP10 of the main light of the field of view passing through the fourth lens and the length DP0 of the main light of the central field of view passing through the fourth lens satisfy: 1.2 <DP10 / DP0<1.4。 2. The optical lens according to claim 1, characterized in that: The object side surface and the image side surface of the central portion of the fourth lens are both flat surfaces, and the object side surface and the image side surface of the edge portion of the fourth lens are both curved surfaces.

3. The optical lens according to claim 2, characterized in that: The object side surface and the image side surface of the edge portion of the fourth lens are aspherical surfaces, and the transmittance T3540 of the fourth lens for incident light in the 350nm to 400nm band satisfies: T3540<5%, and the transmittance T7075 of the fourth lens for incident light in the 700nm to 750nm band satisfies: T7075<15%.

4. The optical lens according to claim 1, characterized in that: The effective radius of the object-side surface of the fourth lens is greater than the effective radius of the object-side surface of the third lens, and the effective radius of the object-side surface of the fourth lens is greater than the effective radius of the image-side surface of the third lens.

5. The optical lens according to claim 4, characterized in that: The maximum effective radius DT41 of the object side of the fourth lens and the maximum effective radius DT32 of the image side of the third lens satisfy: 1.0 <DT41 / DT32<1.1。 6. The optical lens according to claim 1, characterized in that: The effective radius of the object side surface of the fifth lens is greater than the effective radius of the object side surface of the fourth lens, and the effective radius of the object side surface of the fifth lens is greater than the effective radius of the image side surface of the fourth lens; A maximum effective radius DT51 of the object-side surface of the fifth lens and a maximum effective radius DT42 of the image-side surface of the fourth lens satisfy: DT51 / DT42≥1.

3.

7. The optical lens according to claim 6, characterized in that: The maximum effective radius DT51 of the object-side surface of the fifth lens and the maximum effective radius DT42 of the image-side surface of the fourth lens satisfy the following: 1.4>DT51 / DT42≥1.

3.

8. The optical lens according to claim 1, characterized in that: The length DP10 of the chief ray of the 1.0 field of view, the length DP09 of the chief ray of the 0.9 field of view, the length DP08 of the chief ray of the 0.8 field of view, the length DP07 of the chief ray of the 0.7 field of view, and the length DP06 of the chief ray of the 0.6 field of view through the fourth lens satisfy: DP10>DP09>DP08>DP07>DP06.

9. The optical lens according to claim 1, characterized in that: The length DP0 of the principal ray of the central field of view passing through the fourth lens, the length DP09 of the principal ray of the 0.9 field of view passing through the fourth lens, the length DP08 of the principal ray of the 0.8 field of view passing through the fourth lens, the length DP07 of the principal ray of the 0.7 field of view passing through the fourth lens, and the average value DP69 of the length DP06 of the principal ray of the 0.6 field of view passing through the fourth lens satisfy the following: 1.1 <DP69 / DP0<1.3。 10. The optical lens according to any one of claims 1 to 9, characterized in that: The center thickness of the fourth lens is smaller than the edge thickness of the fourth lens, and the transmittance T5065 of the fourth lens for incident light in the wavelength range of 500nm to 650nm satisfies: T5065>85%.

Images