Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises a lens barrel, an optical lens group and a spacer group arranged in the lens barrel; the optical lens group comprises, in sequence from the object side to the image side along the optical axis, a first lens with negative refractive power, a second lens, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, a sixth lens with positive refractive power and a seventh lens with negative refractive power; the spacer group comprises a third spacer arranged on the image side of the third lens and in contact with the image side of the third lens, and a fourth spacer arranged on the image side of the fourth lens and in contact with the image side of the fourth lens; wherein the curvature radius R7 of the object side of the fourth lens, the refractive index N4 of the fourth lens and the inner diameter d3s of the object side of the third spacer satisfy the condition: -5.5 < R7 x N4 / d3s < -2.0; and the curvature radius R9 of the object side of the fifth lens, the Abbe number V5 of the fifth lens and the inner diameter d4s of the object side of the fourth spacer satisfy the condition: -272.0 < R9 x V5 / d4s < -235.0.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an optical imaging lens. Background Art

[0002] In recent years, with the increasing changes in consumer demands, the requirements for optical imaging lenses have gradually become more complex and diverse. In different application scenarios, the performance of optical imaging lenses varies.

[0003] Seven-piece optical imaging lenses have become the mainstream and are widely used in fields such as mobile phones, security, automobiles, and drones. The rear-end lenses have a greater impact on the overall imaging of seven-piece optical imaging lenses. For example, the fourth lens and the fifth lens are more sensitive. When the fourth lens, the fifth lens, and the spacers near them are set unreasonably, there will be obvious stray light phenomena in the optical imaging lens, thus affecting the imaging quality of the optical imaging lens. Summary of the Invention

[0004] This application provides an optical imaging lens that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] One aspect of this application provides such an optical imaging lens, which includes a lens barrel and an optical lens group and a spacer group placed inside the lens barrel. The optical lens group includes a first lens with a negative focal power, a second lens with a focal power, a third lens with a positive focal power, a fourth lens with a negative focal power, a fifth lens with a positive focal power, a sixth lens with a positive focal power, and a seventh lens with a negative focal power arranged in sequence from the object side to the image side along the optical axis. The spacer group includes a third spacer and a fourth spacer. The third spacer is placed on the image side surface of the third lens and contacts the image side surface of the third lens. The fourth spacer is placed on the image side surface of the fourth lens and contacts the image side surface of the fourth lens. Among them, the number of lenses with focal power in the optical imaging lens is seven. The curvature radius R7 of the object side surface of the fourth lens, the refractive index N4 of the fourth lens, and the inner diameter d3s of the object side surface of the third spacer satisfy: -5.5 < R7 × N4 / d3s < -2.0; The curvature radius R9 of the object side surface of the fifth lens, the Abbe number V5 of the fifth lens, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: -272.0 < R9 × V5 / d4s < -235.0.

[0006] According to an exemplary embodiment of this application, the spacer group further includes a fifth spacer placed on the image side surface of the fifth lens and contacting the image side surface of the fifth lens. Among them, the combined focal length f67 of the sixth lens and the seventh lens, the spacing distance T56 between the fifth lens and the sixth lens on the optical axis, and the maximum thickness CP5 of the fifth spacer satisfy: 3.5 < f67 / (CP5 + T56) < 4.5.

[0007] According to an exemplary embodiment of the present application, the spacer group further includes a fifth spacer disposed on the image side of the fifth lens and in contact with the image side of the fifth lens. Among them, the radius of curvature R8 of the image side of the fourth lens, the refractive index N4 of the fourth lens, and the effective focal length f4 of the fourth lens satisfy: -6.5 < R8 × N4 / f4 < -2.5; and the combined focal length f45 of the fourth lens and the fifth lens and the inner diameter d5m of the image side of the fifth spacer satisfy: -4.5 < f45 / d5m < -2.5.

[0008] According to an exemplary embodiment of the present application, the spacer group further includes a fifth spacer disposed on the image side of the fifth lens and in contact with the image side of the fifth lens. Among them, the radius of curvature R14 of the image side of the seventh lens and the outer diameter D5m of the image side of the fifth spacer satisfy: -4.5 < R14 / D5m < -1.5.

[0009] According to an exemplary embodiment of the present application, the effective focal length f3 of the third lens and the interval distance EP34 of the third spacer and the fourth spacer along the optical axis satisfy: 1.5 < f3 / EP34 < 3.5.

[0010] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on the image side of the first lens and in contact with the image side of the first lens. Among them, the interval distance EP01 between the object-side end face of the lens barrel and the first spacer along the optical axis, the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the effective radius vertex of the image side of the first lens, and the interval distance T12 between the first lens and the second lens on the optical axis satisfy: 1.5 < (SAG12 + T12) / EP01 ≤ 4.5.

[0011] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on the image side of the first lens and in contact with the image side of the first lens. Among them, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, the inner diameter d1s of the object side of the first spacer, and the outer diameter D1s of the object side of the first spacer satisfy: -7.0 < f1 × N1 / (D1s - d1s) < -2.0.

[0012] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on the image side of the first lens and in contact with the image side of the first lens. Among them, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1s of the object side of the first spacer, and the inner diameter d1m of the image side of the first spacer satisfy: 1.5 < (R3 × d1m) / (R2 × d1s) < 6.5.

[0013] According to an exemplary embodiment of this application, the spacer assembly further includes a first spacer disposed on and in contact with the image-side surface of the first lens. The center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the maximum thickness CP1 of the first spacer satisfy: 2.0 < (CT2 + CP1) / CT1 < 11.5.

[0014] According to an exemplary embodiment of this application, the spacer assembly further includes a second spacer disposed on and in contact with the image-side surface of the second lens. The spacing T23 between the second and third lenses on the optical axis satisfies a condition of 2.0 with respect to the maximum thickness CP2 of the second spacer. <T23 / CP2<5.6。

[0015] According to an exemplary embodiment of this application, the spacer assembly further includes a second spacer disposed on and in contact with the image-side surface of the second lens. The radius of curvature R5 of the object-side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d2m of the image-side surface of the second spacer satisfy: 3.5 <R5×N3 / d2m<4.6。

[0016] According to an exemplary embodiment of this application, the spacer assembly further includes a second spacer disposed on and in contact with the image-side surface of the second lens. The combined focal length f23 of the second and third lenses, the spacing EP23 between the second and third spacers along the optical axis, and the maximum thickness CP2 and maximum thickness CP3 of the second and third spacers satisfy: 3.8 <f23 / (EP23+CP2+CP3)<7.1。

[0017] According to an exemplary embodiment of this application, the spacer group further includes a first spacer and a second spacer. The first spacer is disposed on the image-side surface of the first lens and contacts the image-side surface of the first lens, and the second spacer is disposed on the image-side surface of the second lens and contacts the image-side surface of the second lens. The spacing EP12 between the first and second spacers along the optical axis, the spacing EP45 between the fourth and fifth spacers along the optical axis, and the maximum thickness CP5 of the fifth spacer satisfy the following condition: 0.5 < (EP45 + CP5) / EP12 < 2.0.

[0018] The optical imaging lens provided by this application uses seven lenses. By controlling the optical imaging lens to satisfy "-5.5 < R7×N4 / d3s < -2.0" and "-272.0 < R9×V5 / d4s < -235.0", the curvature radii of the object sides of the fourth lens and the fifth lens can be restricted, so that the refraction angles of light rays on the object sides of the fourth lens and the fifth lens are within a reasonable range, ensuring that the light transmission of the optical imaging lens meets the requirements; at the same time, by cooperating with restricting the inner diameters of the object sides of the third spacer and the fourth spacer, the edge invalid light rays can be blocked by the third spacer and the fourth spacer as much as possible, reducing stray light spots and improving the imaging quality of the optical imaging lens. Brief Description of the Drawings

[0019] Other features, objects, and advantages of this application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings. Among them:

[0020] Figure 1 Shows a parameter annotation diagram of an optical imaging lens according to an embodiment of this application;

[0021] Figure 2 Shows an optical path diagram of an optical imaging lens according to an embodiment of this application;

[0022] Figure 3 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 1 of this application;

[0023] Figure 4 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 2 of this application;

[0024] Figure 5 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 3 of this application;

[0025] Figure 6A Shows the axial chromatic aberration curve of an optical imaging lens according to Embodiment 1, 2, or 3 of this application;

[0026] Figure 6B Shows the astigmatism curve of an optical imaging lens according to Embodiment 1, 2, or 3 of this application;

[0027] Figure 7 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 4 of this application;

[0028] Figure 8 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 5 of this application;

[0029] Figure 9 Shows a schematic structural diagram of an optical imaging lens according to Embodiment 6 of this application;

[0030] Figure 10A The on-axis chromatic aberration curves of an optical imaging lens according to embodiments 4, 5, or 6 of this application are shown;

[0031] Figure 10B Astigmatism curves of optical imaging lenses according to embodiments 4, 5, or 6 of this application are shown;

[0032] Figure 11 A schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of this application is shown;

[0033] Figure 12 A schematic diagram of the structure of an optical imaging lens according to Embodiment 8 of this application is shown;

[0034] Figure 13 A schematic diagram of the structure of an optical imaging lens according to Embodiment 9 of this application is shown;

[0035] Figure 14A The on-axis chromatic aberration curves of an optical imaging lens according to embodiments 7, 8, or 9 of this application are shown;

[0036] Figure 14B Astigmatism curves of an optical imaging lens according to embodiments 7, 8, or 9 of this application are shown;

[0037] Figure 15 A stray light simulation diagram is shown when the optical imaging lens satisfies R7×N4 / d3s=-1.87 and R9×V5 / d4s=-229.0; and

[0038] Figure 16 A stray light simulation diagram is shown when the optical imaging lens satisfies R7×N4 / d3s=-2.14 and R9×V5 / d4s=-271.30. Detailed Implementation

[0039] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0040] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0041] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0042] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the image plane is called the image-side surface of the lens.

[0043] It should also be understood that the terms "comprising" and / or "having," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0044] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] refer to Figures 3 to 5 , Figures 7 to 9 as well as Figures 11 to 13 The first aspect of this application provides an optical imaging lens that may include an optical lens group, which may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged sequentially along the optical axis from the object side to the image side. Any two adjacent lenses in the first to sixth lenses may have a gap between them.

[0047] In an exemplary embodiment, the first lens may have negative optical power.

[0048] In an exemplary embodiment, the second lens may have positive or negative optical power.

[0049] In an exemplary embodiment, the third lens may have positive optical power.

[0050] In an exemplary embodiment, the fourth lens may have negative optical power.

[0051] In an exemplary embodiment, the fifth lens may have positive optical power.

[0052] In an exemplary embodiment, the sixth lens may have positive optical power.

[0053] In an exemplary embodiment, the seventh lens may have negative optical power.

[0054] In an exemplary embodiment, the object-side surface of the first lens can be convex, and the image-side surface can be concave.

[0055] In an exemplary embodiment, the object-side surface of the second lens can be convex, and the image-side surface can be concave.

[0056] In an exemplary embodiment, the object-side surface of the third lens can be convex, and the image-side surface can be convex.

[0057] In an exemplary embodiment, the object-side surface of the fourth lens can be concave, and the image-side surface can also be concave.

[0058] In an exemplary embodiment, the object-side surface of the fifth lens can be concave, and the image-side surface can be convex.

[0059] In an exemplary embodiment, the object-side surface of the sixth lens can be convex, and the image-side surface can also be convex.

[0060] In an exemplary embodiment, the object-side surface of the seventh lens can be concave, and the image-side surface can be convex.

[0061] In an exemplary embodiment, the sixth lens and the seventh lens can be cemented together to form a cemented lens.

[0062] In an exemplary embodiment, the optical imaging lens may further include an aperture stop. The aperture stop may be disposed between the third lens and the fourth lens.

[0063] In an exemplary embodiment, the optical imaging lens may have seven lenses with optical power.

[0064] In an exemplary embodiment, the optical imaging lens may further include a group of spacers, which may include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, and a fifth spacer. The first spacer may be positioned on the image-side of the first lens and at least partially in contact with it. The second spacer may be positioned on the image-side of the second lens and at least partially in contact with it. The third spacer may be positioned on the image-side of the third lens and at least partially in contact with it. The fourth spacer may be positioned on the image-side of the fourth lens and at least partially in contact with it. The fifth spacer may be positioned on the image-side of the fifth lens and at least partially in contact with it. Proper use of spacers can effectively mitigate stray light risks, reduce interference with image quality, and thus improve the imaging quality of the optical imaging lens.

[0065] In an exemplary embodiment, the outer peripheral surface of at least one spacer in the spacer group may have a truncated portion and a non-truncated portion, and the outer diameter of the truncated portion of the spacer may be smaller than the outer diameter of the non-truncated portion of the spacer. When the outer peripheral surface of the spacer has a truncated portion, the outer diameter of the spacer generally refers to the outer diameter of the non-truncated portion of the spacer. For example, the outer diameter of the object-side surface of the spacer refers to the outer diameter of the portion of the non-truncated portion of the spacer closest to the object side, and the outer diameter of the image-side surface of the spacer refers to the outer diameter of the portion of the non-truncated portion of the spacer closest to the image side.

[0066] In an exemplary embodiment, the optical imaging lens may further include a lens barrel, with an optical lens group and a spacer group disposed within the lens barrel. The lens barrel may include an object-side end face, an image-side end face, an outer annular surface, and an inner annular surface, wherein the end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel furthest from the optical axis is the outer annular surface, and the surface of the lens barrel closest to the optical axis is the inner annular surface.

[0067] In an exemplary embodiment, the radius of curvature R7 of the object side surface of the fourth lens, the refractive index N4 of the fourth lens, and the inner diameter d3s of the object side surface of the third spacer may satisfy: -5.5 < R7×N4 / d3s < -2.0; and the radius of curvature R9 of the object side surface of the fifth lens, the Abbe number V5 of the fifth lens, and the inner diameter d4s of the object side surface of the fourth spacer may satisfy: -272.0 < R9×V5 / d4s < -235.0. By controlling the above conditional expressions, the radii of curvature of the object side surfaces of the fourth lens and the fifth lens can be constrained, so that the refraction angles of the light rays on the object side surfaces of the fourth lens and the fifth lens are within a reasonable range, ensuring that the light transmission amount of the optical imaging lens meets the requirements; at the same time, by restricting the inner diameters of the object side surfaces of the third spacer and the fourth spacer, the marginal ineffective light rays can be blocked by the third spacer and the fourth spacer as much as possible, reducing stray light spots and improving the imaging quality of the optical imaging lens. If R7×N4 / d3s ≥ -2.0 and R9×V5 / d4s ≥ -235.0, the inner diameters of the object side surfaces of the third spacer and the fourth spacer are too large, and the third spacer and the fourth spacer cannot effectively block the marginal ineffective light rays, resulting in a relatively serious stray light phenomenon in the optical imaging lens. If R7×N4 / d3s ≤ -5.5 and R9×V5 / d4s ≤ -272.0, the inner diameters of the object side surfaces of the third spacer and the fourth spacer are too small, and the third spacer and the fourth spacer will block some of the effective light rays, thus affecting the imaging quality of the optical imaging lens.

[0068] The following describes the imaging effect of the optical imaging lens in conjunction with Figure 15 and Figure 16 . Among them, Figure 15 is the stray light simulation diagram when the optical imaging lens satisfies R7×N4 / d3s = -1.87 and R9×V5 / d4s = -229.0; Figure 16 is the stray light simulation diagram when the optical imaging lens satisfies R7×N4 / d3s = -2.14 and R9×V5 / d4s = -271.30.

[0069] When the optical imaging lens satisfies R7×N4 / d3s = -1.87 and R9×V5 / d4s = -229.0, the inner diameters of the object side surfaces of the third spacer and the fourth spacer are too large, and the third spacer and the fourth spacer cannot effectively block the marginal ineffective light rays, resulting in a relatively serious stray light phenomenon in the optical imaging lens (as shown in Figure 15 ). When the optical imaging lens satisfies R7×N4 / d3s = -2.14 and R9×V5 / d4s = -271.30, the inner diameters of the object side surfaces of the third spacer and the fourth spacer are relatively reasonable, and the marginal ineffective light rays can be blocked by the third spacer and the fourth spacer as much as possible, effectively reducing the stray light of the optical imaging lens (as shown in Figure 16) It can be seen that by controlling the optical imaging lens to satisfy "-5.5 < R7×N4 / d3s < -2.0, -272.0 < R9×V5 / d4s < -235.0", stray light can be reduced and the imaging quality of the optical imaging lens can be improved.

[0070] In an exemplary embodiment, the combined focal length f67 of the sixth lens and the seventh lens, the axial distance T56 between the fifth lens and the sixth lens on the optical axis, and the maximum thickness CP5 of the fifth spacer may satisfy: 3.5 < f67 / (CP5 + T56) < 4.5. By controlling the above conditional expression, the coma generated by the front lens can be effectively balanced, and the imaging quality of the optical imaging lens can be improved.

[0071] In an exemplary embodiment, the radius of curvature R8 of the image side of the fourth lens, the refractive index N4 of the fourth lens, and the effective focal length f4 of the fourth lens may satisfy: -6.5 < R8×N4 / f4 < -2.5; and the combined focal length f45 of the fourth lens and the fifth lens and the inner diameter d5m of the image side of the fifth spacer may satisfy: -,. By controlling the above conditional expressions, the effective focal length of the fourth lens and the combined focal length of the fourth lens and the fifth lens can be constrained within a reasonable range, effectively reducing the aberration of the marginal field of view; at the same time, by restricting the radius of curvature of the image side of the fourth lens, the refractive index of the fourth lens, and the inner diameter of the image side of the fifth spacer, an appropriate light transmission amount can be obtained at the positions of the fourth lens and the fifth lens, improving the image plane illuminance of the optical imaging lens.

[0072] In an exemplary embodiment, the radius of curvature R14 of the image side of the seventh lens and the outer diameter D5m of the image side of the fifth spacer may satisfy: -4.5 < R14 / D5m < -1.5. By controlling the above conditional expression, the outer diameter of the image side of the fifth spacer can be constrained within a reasonable range, making the assembly step difference between the seventh lens and the fifth lens appropriate, improving the assembly stability of the seventh lens; at the same time, by restricting the radius of curvature of the image side of the seventh lens, the exit angle of the light rays exiting from the seventh lens can meet the requirements, improving the picture pixels of the optical imaging lens.

[0073] In an exemplary embodiment, the effective focal length f3 of the third lens and the axial distance EP34 between the third spacer and the fourth spacer may satisfy: 1.5 < f3 / EP34 < 3.5. By controlling the above conditional expression, the effective focal length of the third lens can be constrained within a reasonable range, and at the same time, by restricting the axial distance between the third spacer and the fourth spacer, the spherical aberration generated by the third lens and the spherical aberration generated by the front lens group (for example, the lens group formed by the first lens and the second lens) can be balanced with each other, thus ensuring that the picture of the optical imaging lens meets the requirements.

[0074] In an exemplary embodiment, the axial distance EP01 between the object-side end face of the lens barrel and the first spacer along the optical axis, the axial distance SAG12 between the intersection point of the image side surface of the first lens and the optical axis and the effective radius vertex of the image side surface of the first lens, and the axial distance T12 between the first lens and the second lens on the optical axis may satisfy: 1.5 < (SAG12 + T12) / EP01 ≤ 4.5. By controlling the above conditional expression, the sag of the image side surface of the first lens can be constrained within a reasonable range, making the transition of the image side surface of the first lens smooth, ensuring that the first lens meets the refraction requirements of incident light while having good machinability; at the same time, by coordinating to limit the axial distance between the object-side end face of the lens barrel and the first spacer along the optical axis and the axial distance between the first lens and the second lens on the optical axis, the optical sensitivity of the first lens can be reduced, and the stability of the optical imaging lens can be improved.

[0075] In an exemplary embodiment, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, the inner diameter d1s of the object side surface of the first spacer and the outer diameter D1s of the object side surface of the first spacer may satisfy: -7.0 < f1 × N1 / (D1s - d1s) < -2.0. By controlling the above conditional expression, the effective focal length and refractive index of the first lens can be constrained within a reasonable range, making the optical imaging lens have a larger aperture and improving the overall brightness of the optical imaging lens; at the same time, by coordinating to limit the difference between the outer diameter and the inner diameter of the object side surface of the first spacer, the non-effective diameter part of the first lens can have an appropriate size in the direction perpendicular to the optical axis, improving the machinability of the first lens.

[0076] In an exemplary embodiment, the radius of curvature R2 of the image side surface of the first lens, the radius of curvature R3 of the object side surface of the second lens, the inner diameter d1s of the object side surface of the first spacer and the inner diameter d1m of the image side surface of the first spacer may satisfy: 1.5 < (R3 × d1m) / (R2 × d1s) < 6.5. By controlling the above conditional expression, the radii of curvature of the image side surface of the first lens and the object side surface of the second lens can be constrained, making the first lens and the second lens have reasonable optical powers and ensuring that the optical imaging lens has good ability to balance chromatic aberration and distortion; at the same time, by coordinating to limit the inner diameters of the object side surface and the image side surface of the first spacer, the marginal ineffective light rays can be blocked by the first spacer as much as possible, reducing stray light and improving the imaging quality of the optical imaging lens.

[0077] In an exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, and the maximum thickness CP1 of the first spacer may satisfy: 2.0 < (CT2 + CP1) / CT1 < 11.5. By controlling the above conditional expression, the thicknesses of the first lens, the second lens, and the first spacer can be constrained within a reasonable range, and when the overall optical length of the optical imaging lens meets the requirements, the lens forming process can be ensured to meet the process requirements.

[0078] In an exemplary embodiment, the spacing distance T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacer may satisfy: 2.0 < T23 / CP2 < 5.6. By controlling the above conditional expression, the spacing distance between the second lens and the third lens can be constrained within a reasonable range, so that the refraction angle of the light incident on the third lens is appropriate, ensuring that the optical imaging lens has good distortion performance.

[0079] In an exemplary embodiment, the curvature radius R5 of the object side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d2m of the image side surface of the second spacer may satisfy: 3.5 < R5×N3 / d2m < 4.6. By controlling the above conditional expression, the curvature radius of the object side surface of the third lens and the refractive index of the third lens can be constrained within a reasonable range, and then the deflection angle of the marginal field of view on the third lens can be constrained, effectively reducing the sensitivity of the optical imaging lens; at the same time, by cooperating with restricting the inner diameter of the image side surface of the second spacer, the marginal ineffective light can be blocked by the second spacer as much as possible, reducing stray light and improving the imaging quality of the optical imaging lens.

[0080] In an exemplary embodiment, the combined focal length f23 of the second lens and the third lens, the spacing distance EP23 between the second spacer and the third spacer along the optical axis, the maximum thickness CP2 of the second spacer, and the maximum thickness CP3 of the third spacer may satisfy: 3.8 < f23 / (EP23 + CP2 + CP3) < 7.1. By controlling the above conditional expression, the combined focal length of the second lens and the third lens can be constrained within a reasonable range, and the lens group formed by the second lens and the third lens has a positive optical power to balance the negative optical power generated by the first lens, ensuring that the optical imaging lens tends to be in a balanced state; at the same time, the thicknesses of the second spacer and the third spacer can be reasonably distributed to ensure that the second spacer and the third spacer have good structural strength and supporting ability, improving the assembly stability of the optical imaging lens.

[0081] In an exemplary embodiment, the spacing EP12 between the first and second spacers along the optical axis, the spacing EP45 between the fourth and fifth spacers along the optical axis, and the maximum thickness CP5 of the fifth spacer can satisfy: 0.5 < (EP45 + CP5) / EP12 < 2.0. By controlling the above conditional expression, the air gaps between lenses can be reasonably allocated, ensuring sufficient spacing between lenses, thereby ensuring a high degree of freedom in lens surface changes and improving the ability of the optical imaging lens to correct astigmatism and field curvature.

[0082] The optical imaging lens according to the above embodiments of this application can employ seven lenses and at least one spacer. By rationally allocating the parameters of each lens and each spacer, the sensitivity of the optical imaging lens can be reduced, the risk of stray light in the optical imaging lens can be improved, and the imaging quality and assembly stability of the optical imaging lens can be enhanced.

[0083] In embodiments of this application, at least one surface of each of the first to seventh lenses is an aspherical surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, both the object-side and image-side surfaces of each of the first to seventh lenses are aspherical surfaces.

[0084] refer to Figures 3 to 5 , Figures 7 to 9 as well as Figures 11 to 13 A second aspect of this application provides an optical imaging lens that may include a lens barrel and an optical lens group and a spacer group disposed within the lens barrel. The optical lens group may include, arranged sequentially along the optical axis from the object side to the image side, a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power. The spacer group may include a fifth spacer disposed on and in contact with the image-side surface of the fifth lens. The optical imaging lens may have seven lenses with optical power.

[0085] Among them, the radius of curvature R8 of the image side of the fourth lens, the refractive index N4 of the fourth lens, and the effective focal length f4 of the fourth lens can satisfy: -6.5 < R8 × N4 / f4 < -2.5; and the combined focal length f45 of the fourth lens and the fifth lens and the inner diameter d5m of the image side of the fifth spacer can satisfy: -4.5 < f45 / d5m < -2.5. The optical imaging lens provided in this application uses seven lenses. By controlling the optical imaging lens to satisfy "-6.5 < R8 × N4 / f4 < -2.5" and "-4.5 < f45 / d5m < -2.5", the effective focal length of the fourth lens and the combined focal length of the fourth lens and the fifth lens can be constrained within a reasonable range, effectively reducing the aberration of the marginal field of view; at the same time, by restricting the radius of curvature of the image side of the fourth lens, the refractive index of the fourth lens, and the inner diameter of the image side of the fifth spacer, an appropriate amount of light can pass through the positions of the fourth lens and the fifth lens, improving the image plane illuminance of the optical imaging lens.

[0086] Those skilled in the art should understand that without departing from the technical solutions claimed in this application, the number of lenses and spacers constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification.

[0087] The following further describes specific embodiments of the optical imaging lens applicable to the above embodiments with reference to the accompanying drawings.

[0088] Example 1

[0089] The following refers to Figure 3 Describe the optical imaging lens according to Embodiment 1 of this application.

[0090] As Figure 3 shown, the optical imaging lens includes a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group sequentially includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 along the optical axis from the object side to the image side. The sixth lens E6 and the seventh lens E7 are glued together to form a cemented lens. The aperture stop STO is disposed between the third lens E3 and the fourth lens E4.

[0091] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface being convex. The seventh lens E7 has negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being convex. An optical element, such as a filter, may also be disposed between the seventh lens E7 and the imaging surface S17. This optical element has an object-side surface S14 (not shown) and an image-side surface S15 (not shown). Light from an object can be arranged in the following order: Figure 2 The path shown passes sequentially through surfaces S1 to S15 and is finally imaged onto imaging surface S16 (not shown).

[0092] The spacer assembly may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacers can block excess light from entering the next lens during the imaging process, while also allowing the lens to better contact the lens barrel P0, thus enhancing the structural stability of the optical imaging lens.

[0093] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0094]

[0095] Table 1

[0096] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0097]

[0098] Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A13 that can be used for each aspherical surface S1-S13 in Example 1. 10 A 12 A 14 A 16 A 18A 20 A 22 A 24 A 26 A 28 and A 30 .

[0099]

[0100]

[0101] Table 2

[0102] Example 2

[0103] The following is for reference Figure 4 Describes an optical imaging lens according to Embodiment 2 of this application.

[0104] like Figure 4 As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group may sequentially include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 along the optical axis from the object side to the image side. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacer group may also include a first auxiliary spacer P1b disposed on the image-side surface of the first spacer P1 and at least partially in contact with the image-side surface of the first spacer P1.

[0105] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 1. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 1, and the aspherical coefficient table is the same as that in Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some components in the lens barrel P0 and the spacer assembly are different.

[0106] Example 3

[0107] The following is for reference Figure 5 Describes an optical imaging lens according to Embodiment 3 of this application.

[0108] like Figure 5As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group may include, in sequence along the optical axis 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, and a seventh lens E7. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5.

[0109] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 1. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 1, and the aspherical coefficient table is the same as that in Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some components in the lens barrel P0 and the spacer assembly are different.

[0110] Figure 6A The on-axis chromatic aberration curves of the optical imaging lenses of Embodiments 1, 2, or 3 are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 6B Astigmatism curves for optical imaging lenses of Embodiments 1, 2, or 3 are shown, representing meridional and sagittal image plane curvatures corresponding to different image heights. According to... Figure 6A and Figure 6B It can be seen that the optical imaging lenses of Embodiments 1, 2 or 3 can achieve good imaging quality.

[0111] Example 4

[0112] The following is for reference Figure 7 The optical imaging lens according to Embodiment 4 of this application is described.

[0113] like Figure 7 As shown, the optical imaging lens includes a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group, arranged sequentially along the optical axis from the object side to the image side, includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4.

[0114] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface being convex. The seventh lens E7 has negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being convex. An optical element, such as a filter, may also be disposed between the seventh lens E7 and the imaging surface S17. This optical element has an object-side surface S14 (not shown) and an image-side surface S15 (not shown). Light from an object can be arranged in the following order: Figure 2 The path shown passes sequentially through surfaces S1 to S15 and is finally imaged onto imaging surface S16 (not shown).

[0115] The spacer assembly may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacers can block excess light from entering the next lens during the imaging process, while also allowing the lens to better contact the lens barrel P0, thus enhancing the structural stability of the optical imaging lens.

[0116] Table 3 shows the basic parameters of the optical imaging lens of Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0117]

[0118]

[0119] Table 3

[0120] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 4 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical surfaces S1-S13 in Embodiment 4. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0121] Face number A4 A6 A8 A10 A12 A14 A16 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S12 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S13 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00

[0122] Table 4

[0123] Example 5

[0124] The following is for reference Figure 8 Describes an optical imaging lens according to Embodiment 5 of this application.

[0125] like Figure 8 As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group may include, in sequence along the optical axis 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, and a seventh lens E7. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5.

[0126] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 4. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 3, and the aspherical coefficient table is the same as that in Table 4. The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some of the components in the lens barrel P0 and the spacer assembly are different.

[0127] Example 6

[0128] The following is for reference Figure 9 Describes an optical imaging lens according to Embodiment 6 of this application.

[0129] like Figure 9 As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group may sequentially include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 along the optical axis from the object side to the image side. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacer group may also include a first auxiliary spacer P1b disposed on the image-side surface of the first spacer P1 and at least partially in contact with the image-side surface of the first spacer P1.

[0130] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 4. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 3, and the aspherical coefficient table is the same as that in Table 4. The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some of the components in the lens barrel P0 and the spacer assembly are different.

[0131] Figure 10A The on-axis chromatic aberration curves of the optical imaging lenses of Embodiments 4, 5, or 6 are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 10B Astigmatism curves for the optical imaging lenses of Embodiments 4, 5, or 6 are shown, representing the meridional and sagittal image plane curvatures corresponding to different image heights. According to... Figure 10A and Figure 10B It can be seen that the optical imaging lenses of embodiments 4, 5 or 6 can achieve good imaging quality.

[0132] Example 7

[0133] The following is for reference Figure 11 Describes an optical imaging lens according to Embodiment 7 of this application.

[0134] like Figure 11 As shown, the optical imaging lens includes a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group, arranged sequentially along the optical axis from the object side to the image side, includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4.

[0135] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface being convex. The seventh lens E7 has negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being convex. An optical element, such as a filter, may also be disposed between the seventh lens E7 and the imaging surface S17. This optical element has an object-side surface S14 (not shown) and an image-side surface S15 (not shown). Light from an object can be arranged in the following order: Figure 2 The path shown passes sequentially through surfaces S1 to S15 and is finally imaged onto imaging surface S16 (not shown).

[0136] The spacer assembly may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacers can block excess light from entering the next lens during the imaging process, while also allowing the lens to better contact the lens barrel P0, thus enhancing the structural stability of the optical imaging lens.

[0137] Table 5 shows the basic parameters of the optical imaging lens of Example 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0138]

[0139] Table 5

[0140] In this embodiment, the object-side surface and image-side surface of any one of the lenses, from the first lens E1 to the seventh lens E7, are aspherical. Table 6 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical surface S1-S13 in Embodiment 7. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0141]

[0142]

[0143] Table 6

[0144] Example 8

[0145] The following is for reference Figure 12 Describes an optical imaging lens according to Embodiment 8 of this application.

[0146] like Figure 12As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group may sequentially include a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 along the optical axis from the object side to the image side. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5. The spacer group may also include a first auxiliary spacer P1b disposed on the image-side surface of the first spacer P1 and at least partially in contact with the image-side surface of the first spacer P1.

[0147] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 7. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 5, and the aspherical coefficient table is the same as that in Table 6. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some of the components in the lens barrel P0 and the spacer assembly are different.

[0148] Example 9

[0149] The following is for reference Figure 13 Describes an optical imaging lens according to Embodiment 9 of this application.

[0150] like Figure 13 As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group disposed within the lens barrel P0. The optical lens group may include, in sequence along the optical axis 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, and a seventh lens E7. The sixth lens E6 and the seventh lens E7 are cemented together to form a cemented lens. An aperture stop STO is disposed between the third lens E3 and the fourth lens E4. The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5.

[0151] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 7. That is, the basic parameter table of the optical imaging lens in this embodiment is the same as that in Table 5, and the aspherical coefficient table is the same as that in Table 6. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some of the components in the lens barrel P0 and the spacer assembly are different.

[0152] Figure 14A The on-axis chromatic aberration curves of the optical imaging lenses of Embodiments 7, 8, or 9 are shown, which represent the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 14BAstigmatism curves for the optical imaging lenses of Embodiments 7, 8, or 9 are shown, representing the meridional and sagittal image plane curvatures corresponding to different image heights. According to... Figure 14A and Figure 14B It can be seen that the optical imaging lenses of embodiments 7, 8 or 9 can achieve good imaging quality.

[0153] Table 7 shows the values ​​of parameters such as f1, f2, f3, f4, f5, f23, f45, f67, and SAG12 for each embodiment in Examples 1-9.

[0154] Conditional / Example 1 2 3 4 5 6 7 8 9 f1(mm) -6.53 -6.53 -6.53 -6.89 -6.89 -6.89 -9.86 -9.86 -9.86 f2 (mm) -46.14 -46.14 -46.14 84.87 84.87 84.87 94.27 94.27 94.27 f3 (mm) 4.49 4.49 4.49 6.01 6.01 6.01 6.97 6.97 6.97 f4 (mm) -5.55 -5.55 -5.55 -5.94 -5.94 -5.94 -6.17 -6.17 -6.17 f5 (mm) 8.67 8.67 8.67 9.40 9.40 9.40 10.58 10.58 10.58 f23(mm) 5.38 5.38 5.38 6.42 6.42 6.42 7.12 7.12 7.12 f45 (mm) -34.47 -34.47 -34.47 -31.95 -31.95 -31.95 -24.76 -24.76 -24.76 f67 (mm) 11.12 11.12 11.12 8.80 8.80 8.80 9.08 9.08 9.08 SAG12 (mm) 3.07 3.07 3.07 2.04 2.04 2.04 2.14 2.14 2.14

[0155] Table 7

[0156] Table 8 shows the values ​​of parameters d1s, d1m, D1s, d2m, d3s, d4s, d5m, D5m, EP01, CP1, EP12, CP2, EP23, CP3, EP34, EP45, and CP5 for each embodiment in Examples 1-9. At least some of these parameters can be calculated according to... Figure 1 The measurements were obtained using the annotation method shown, and the units for all parameters listed in Table 8 are mm.

[0157] Conditional / Example 1 2 3 4 5 6 7 8 9 d1s 6.861 6.450 6.817 7.436 7.415 7.131 8.011 8.831 7.940 d1m 6.618 6.450 6.263 5.863 6.077 7.131 6.677 7.544 6.701 D1s 8.688 12.222 10.022 11.078 9.310 12.578 10.627 11.446 10.545 d2m 4.885 5.087 4.924 4.250 4.186 4.504 4.901 5.128 4.901 d3s 4.452 4.574 4.452 3.687 3.687 3.794 4.043 4.139 4.043 d4s 4.709 5.201 5.239 4.154 4.154 4.271 4.243 4.275 4.216 d5m 7.753 8.245 8.336 8.545 8.188 8.505 8.218 9.038 8.927 D5m 8.575 9.068 10.856 11.738 8.903 9.220 9.144 9.964 11.150 EP01 3.727 3.702 1.499 2.654 3.368 3.368 2.870 2.870 1.740 CP1 1.021 0.025 1.272 2.661 2.661 0.022 2.883 2.828 2.875 EP12 4.164 5.164 4.353 2.732 2.728 5.356 1.842 1.866 1.833 CP2 0.020 0.041 0.035 0.026 0.030 0.041 0.018 0.049 0.035 EP23 1.310 1.310 1.310 0.861 0.861 0.861 1.450 1.450 1.450 CP3 0.038 0.054 0.041 0.050 0.022 0.055 0.025 0.048 0.020 EP34 2.291 2.275 2.320 2.026 2.064 2.006 2.132 2.083 2.160 EP45 0.597 0.592 0.597 0.931 0.930 0.931 1.000 1.000 1.000 CP5 2.472 2.526 2.501 2.255 2.255 2.255 2.177 2.177 2.177

[0158] Tables 8 and 9 show the values ​​of the conditional expressions for each of the embodiments in Examples 1-9.

[0159]

[0160]

[0161] Table 9

[0162] This application also provides an imaging device, wherein the electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0163] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging lens, characterized in that, include: An optical lens group includes a first lens with negative optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power, arranged sequentially along the optical axis from the object side to the image side. A spacer assembly includes a third spacer and a fourth spacer, wherein the third spacer is positioned on the image-side surface of the third lens and contacts the image-side surface of the third lens, and the fourth spacer is positioned on the image-side surface of the fourth lens and contacts the image-side surface of the fourth lens. as well as The lens barrel, in which the optical lens group and the spacer group are placed; The optical imaging lens has seven lenses with optical power. The object-side surface of the first lens is convex. The object-side surface of the fourth lens is concave. The object-side surface of the fifth lens is concave. The image-side surface of the seventh lens is convex. The radius of curvature R7 of the object side surface of the fourth lens, the refractive index N4 of the fourth lens, and the inner diameter d3s of the object side surface of the third spacer satisfy: -4.52≤R7×N4 / d3s≤-2.08; The radius of curvature R9 of the object side surface of the fifth lens, the Abbe number V5 of the fifth lens, and the inner diameter d4s of the object side surface of the fourth spacer satisfy: -271.30≤R9×V5 / d4s≤-237.

01.

2. The optical imaging lens according to claim 1, wherein, The spacer assembly further includes a fifth spacer disposed on the image-side surface of the fifth lens and in contact with the image-side surface of the fifth lens; Wherein, the combined focal length f67 of the sixth lens and the seventh lens, the spacing T56 between the fifth lens and the sixth lens on the optical axis and the maximum thickness CP5 of the fifth spacer satisfy: 3.67≤f67 / (CP5+T56)≤4.

41.

3. The optical imaging lens according to claim 1, wherein, The spacer assembly further includes a fifth spacer disposed on the image-side surface of the fifth lens and in contact with the image-side surface of the fifth lens; Wherein, the radius of curvature R8 of the image-side surface of the fourth lens, the refractive index N4 of the fourth lens, and the effective focal length f4 of the fourth lens satisfy: -6.10≤R8×N4 / f4≤-2.62; and the combined focal length f45 of the fourth lens and the fifth lens and the inner diameter d5m of the image-side surface of the fifth spacer satisfy: -4.45≤f45 / d5m≤-2.

74.

4. The optical imaging lens according to claim 1, wherein, The spacer assembly further includes a fifth spacer disposed between and in contact with the image-side surfaces of the fifth lens; The radius of curvature R14 of the image side of the seventh lens and the outer diameter D5m of the image side of the fifth spacer satisfy the following condition: -4.33≤R14 / D5m≤-1.

83.

5. The optical imaging lens according to claim 1, wherein, The effective focal length f3 of the third lens and the spacing EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1.94≤f3 / EP34≤3.

35.

6. The optical imaging lens according to any one of claims 1-5, wherein, The spacer assembly further includes a first spacer disposed on the image-side surface of the first lens and in contact with the image-side surface of the first lens; Wherein, the distance EP01 between the object-side end face of the lens barrel and the first spacer along the optical axis, the axial distance SAG12 between the intersection of the image-side surface of the first lens and the optical axis and the effective radius vertex of the image-side surface of the first lens, and the distance T12 between the first lens and the second lens on the optical axis satisfy: 1.81≤(SAG12+T12) / EP01≤4.

50.

7. The optical imaging lens according to any one of claims 1-5, wherein, The spacer assembly further includes a first spacer disposed on the image-side surface of the first lens and in contact with the image-side surface of the first lens; Wherein, the effective focal length f1 of the first lens, the refractive index N1 of the first lens, the inner diameter d1s of the object side of the first spacer and the outer diameter D1s of the object side of the first spacer satisfy: -6.72≤f1×N1 / (D1s-d1s)≤-2.

09.

8. The optical imaging lens according to any one of claims 1-5, wherein, The spacer assembly further includes a first spacer disposed on the image-side surface of the first lens and in contact with the image-side surface of the first lens; Wherein, the radius of curvature R2 of the image side of the first lens, the radius of curvature R3 of the object side of the second lens, the inner diameter d1s of the object side of the first spacer and the inner diameter d1m of the image side of the first spacer satisfy: 1.96≤(R3×d1m) / (R2×d1s)≤6.

28.

9. The optical imaging lens according to any one of claims 1-5, wherein, The spacer assembly further includes a first spacer disposed on the image-side surface of the first lens and in contact with the image-side surface of the first lens; Wherein, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis and the maximum thickness CP1 of the first spacer satisfy: 2.48≤(CT2+CP1) / CT1≤11.

04.

10. The optical imaging lens according to any one of claims 1-5, wherein, The spacer assembly further includes a second spacer disposed on the image-side surface of the second lens and in contact with the image-side surface of the second lens; Wherein, the distance T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacer satisfy: 2.05≤T23 / CP2<5.

6.

11. The optical imaging lens according to any one of claims 1-5, wherein, The spacer assembly further includes a second spacer disposed on the image-side surface of the second lens and in contact with the image-side surface of the second lens; The radius of curvature R5 of the object side of the third lens, the refractive index N3 of the third lens, and the inner diameter d2m of the image side of the second spacer satisfy the following condition: 3.55≤R5×N3 / d2m≤4.

54.

12. The optical imaging lens according to any one of claims 1-5, wherein, The spacer assembly further includes a second spacer disposed on the image-side surface of the second lens and in contact with the image-side surface of the second lens; Wherein, the combined focal length f23 of the second lens and the third lens, the spacing EP23 between the second spacer and the third spacer along the optical axis, and the maximum thickness CP2 and the maximum thickness CP3 of the second spacer satisfy: 3.8 <f23 / (EP23+CP2+CP3)≤7.03。 13. The optical imaging lens according to any one of claims 2-4, wherein, The spacer assembly further includes a first spacer and a second spacer, wherein the first spacer is placed on the image-side surface of the first lens and contacts the image-side surface of the first lens, and the second spacer is placed on the image-side surface of the second lens and contacts the image-side surface of the second lens. Wherein, the spacing distance EP12 between the first spacer and the second spacer along the optical axis, the spacing distance EP45 between the fourth spacer and the fifth spacer along the optical axis, and the maximum thickness CP5 of the fifth spacer satisfy: 0.59≤(EP45+CP5) / EP12≤1.73.

Images