Optical imaging lens

Abstract

The present application discloses an optical imaging lens, which includes a lens barrel, and an optical lens group and a spacer group disposed within the lens barrel; the optical lens group includes a first lens with a negative optical power, a second lens, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, a sixth lens with a positive optical power, and a seventh lens with a negative optical power, which are arranged in sequence from the object side to the image side along the optical axis; the spacer group includes a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens, and a fourth spacer disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens; wherein, 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: -5.5 < R7 × N4 / d3s < -2.0; 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: -272.0 < R9 × V5 / d4s < -235.0.

Description

Technical Field

[0001] The present 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 not reasonably arranged, obvious stray light phenomena will occur in the optical imaging lens, thereby affecting the imaging quality of the optical imaging lens. Summary of the Utility Model

[0004] The present 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 the present application provides such an optical imaging lens, which includes a lens barrel, an optical lens group, and a spacer group disposed in 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 disposed on the image side surface of the third lens and is in contact with the image side surface of the third lens. The fourth spacer is disposed on the image side surface of the fourth lens and is in contact with 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 the present application, the spacer group 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. 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 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: -6.5 < 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 surface 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 and in contact with the image side surface of the fifth lens. Wherein, the radius of curvature R14 of the image side surface of the seventh lens and the outer diameter D5m of the image side surface 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 between 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 and in contact with the image side surface of the first lens. Wherein, the interval distance EP01 between the object side end surface 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 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 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 surface of the first spacer, and the outer diameter D1s of the object side surface 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 and in contact with the image side surface of the first lens. Wherein, 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 satisfy: 1.5 < (R3×d1m) / (R2×d1s) < 6.5.

[0013] According to an exemplary embodiment of the present application, the spacer set 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. 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 the present application, the spacer set further includes a second spacer disposed on the image side of the second lens and in contact with the image side of the second lens. 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 satisfy: 2.0 <T23 / CP2<5.6。

[0015] According to an exemplary embodiment of the present application, the spacer set 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 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 satisfy: 3.5 <R5×N3 / d2m<4.6。

[0016] According to an exemplary embodiment of the present application, the spacer set further includes a second spacer disposed on the image side of the second lens and in contact with the image side of the second lens. 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 satisfy: 3.8 <f23 / (EP23+CP2+CP3)<7.1。

[0017] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer and a second spacer, the first spacer is placed on the image side of the first lens and contacts the image side of the first lens, and the second spacer is placed on the image side of the second lens and contacts the image side 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: 0.5<(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 the light rays on the object sides 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 cooperating with restricting the inner diameters of the object sides of the third spacer and the fourth spacer, the edge 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. 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 the parameter marking diagram of the optical imaging lens according to the embodiment of this application;

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

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

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

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

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

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

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

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

[0029] Fig. 9 Shows the structural schematic diagram of the optical imaging lens according to Embodiment 6 of this application;

[0030] Fig. 10A shows an axial chromatic aberration curve of the optical imaging lens according to Embodiment 4, 5 or 6 of the present application;

[0031] Fig. 10B shows an astigmatism curve of the optical imaging lens according to Embodiment 4, 5 or 6 of the present application;

[0032] Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown;

[0033] Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown;

[0034] Fig.13 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown;

[0035] Fig.14A shows an axial chromatic aberration curve of the optical imaging lens according to Embodiment 7, 8 or 9 of the present application;

[0036] Fig. 14B shows an astigmatism curve of the optical imaging lens according to Embodiment 7, 8 or 9 of the present application;

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

[0038] Fig.16 A stray light simulation diagram is shown when the optical imaging lens satisfies R7×N4 / d3s=-2.14, R9×V5 / d4s=-271.30. DETAILED DESCRIPTION

[0039] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0040] 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.

[0041] 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.

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

[0043] It should also be understood that the terms "including" 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. In addition, when describing the embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0044] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0045] 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 application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] refer to Figures 3 to 5 , Figures 7 to 9 as well as Figures 11 to 13 In a first aspect of the present application, an optical imaging lens is provided. The optical imaging lens may include an optical lens group. The optical lens group 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 in sequence from the object side to the image side along the optical axis. Among the first lens to the sixth lens, any two adjacent lenses may have a spacing distance.

[0047] In example embodiments, the first lens may have negative optical power.

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

[0049] In example embodiments, the third lens may have positive refractive power.

[0050] In example embodiments, the fourth lens may have negative power.

[0051] In example embodiments, the fifth lens may have positive refractive power.

[0052] In example embodiments, the sixth lens may have positive refractive power.

[0053] In example embodiments, the seventh lens may have negative power.

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

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

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

[0057] In exemplary embodiments, the object-side surface of the fourth lens may be a concave surface, and the image-side surface may be a concave surface.

[0058] In exemplary embodiments, the object-side surface of the fifth lens may be a concave surface, and the image-side surface may be a convex surface.

[0059] In exemplary embodiments, the object-side surface of the sixth lens may be a convex surface, and the image-side surface may be a convex surface.

[0060] In exemplary embodiments, the object-side surface of the seventh lens may be a concave surface, and the image-side surface may be a convex surface.

[0061] In exemplary embodiments, the sixth lens and the seventh lens may be cemented and form a cemented lens.

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

[0063] In an exemplary embodiment, the number of lenses having optical power of the optical imaging lens may be seven.

[0064] In an exemplary embodiment, the optical imaging lens may further include a spacer group, and the spacer group 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 placed on the image side of the first lens and at least partially in contact with the image side of the first lens. The second spacer may be placed on the image side of the second lens and at least partially in contact with the image side of the second lens. The third spacer may be placed on the image side of the third lens and at least partially in contact with the image side of the third lens. The fourth spacer may be placed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The fifth spacer may be placed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. Reasonable use of spacers can effectively avoid stray light risks, reduce interference with image quality, and thereby 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 trimmed portion and a non-trimmed portion, and the outer diameter of the trimmed portion of the spacer may be smaller than the outer diameter of the non-trimmed portion of the spacer. When the outer peripheral surface of the spacer has a trimmed portion, the outer diameter of the spacer generally refers to the outer diameter of the non-trimmed 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-trimmed 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-trimmed portion of the spacer closest to the image side.

[0066] In an exemplary embodiment, the optical imaging lens may further include a lens barrel, and the optical lens group and the spacer group are disposed in the lens barrel. The lens barrel may include an object side end surface, an image side end surface, an outer annular surface, and an inner annular surface, wherein the end surface of the lens barrel closest to the object side is the object side end surface of the lens barrel, and the end surface of the lens barrel closest to the image side is the image side end surface of the lens barrel; in a direction perpendicular to the optical axis, the surface of the lens barrel farthest 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 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 cooperating with 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, and the stray light phenomenon of the optical imaging lens is relatively serious. 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 part of the effective light rays, thereby affecting the imaging quality of the optical imaging lens.

[0068] The imaging effect of the optical imaging lens will be described below in conjunction with Fig.15 and Fig.16 . Among them, Fig.15 is the stray light simulation diagram when the optical imaging lens satisfies R7×N4 / d3s = -1.87 and R9×V5 / d4s = -229.0; Fig.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, and the stray light phenomenon of the optical imaging lens is relatively serious (as shown in Fig.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 Fig.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 can 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 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. 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 can 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 can 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 processability; at the same time, by coordinating with restricting 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 with restricting 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 processability 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 capabilities of balancing chromatic aberration and distortion; at the same time, by coordinating with restricting 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, it is ensured that the lens forming process meets 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, thereby constraining the deflection angle of the marginal field of view on the third lens, 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 a balanced state; at the same time, the thicknesses of the second spacer and the third spacer can be reasonably allocated 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 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 can satisfy: 0.5<(EP45+CP5) / EP12<2.0. By controlling the above conditional expression, the air gap between the lenses can be reasonably allocated so that there is enough spacing space between the lenses, thereby ensuring a high degree of freedom of lens surface change and improving the ability of the optical imaging lens to correct astigmatism and field curvature.

[0082] According to the above-mentioned embodiment of the present application, the optical imaging lens can use seven lenses and at least one spacer. By reasonably allocating the parameters of each lens and each spacer, the sensitivity of the optical imaging lens can be reduced, the stray light risk of the optical imaging lens can be improved, and the imaging quality and assembly stability of the optical imaging lens can be improved.

[0083] In an embodiment of the present application, at least one of the surfaces of each lens in the first lens to the seventh lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having 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. Optionally, the object side surface and the image side surface of each lens in the first lens to the seventh lens are both aspherical surfaces.

[0084] refer to Figures 3 to 5 , Figures 7 to 9 as well as Figures 11 to 13 The second aspect of the present application provides such an optical imaging lens, which may include a lens barrel and an optical lens group and a spacer group placed in the lens barrel. The optical lens group may include 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 in sequence from the object side to the image side along the optical axis. The spacer group may include a fifth spacer placed on the image side of the fifth lens and in contact with the image side of the fifth lens. The number of lenses with optical power in the optical imaging lens may be seven.

[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 cooperating with 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 passing 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.

[0086] Those skilled in the art should understand that without departing from the technical solution 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 in 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 cemented 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 focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is convex. An optical element may also be provided between the seventh lens E7 and the imaging surface S17, and the optical element may be, for example, a filter, and the optical element has an object side surface S14 (not shown) and an image side surface S15 (not shown). The light from the object can be Figure 2 The path shown passes through the surfaces S1 to S15 in sequence and is finally imaged on an imaging surface S16 (not shown).

[0092] 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 spacers can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel P0, thereby enhancing the structural stability of the optical imaging lens.

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

[0094]

[0095] Table 1

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

[0097]

[0098] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A 10 , A 12 , A 14 , A 16 , A 18, A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0099]

[0100]

[0101] Table 2

[0102] Example 2

[0103] The following reference Figure 4 An optical imaging lens according to Embodiment 2 of the present application is described.

[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 placed in the lens barrel P0. The optical lens group may 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 in sequence from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. The aperture STO is arranged 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 placed on the image side of the first spacer P1 and at least partially in contact with the image side of the first spacer P1.

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

[0106] Example 3

[0107] The following reference Figure 5 An optical imaging lens according to Embodiment 3 of the present application is described.

[0108] like Figure 5As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The optical lens group may 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 in sequence from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. The aperture STO is arranged 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 of this embodiment is the same as that of the optical lens group of Embodiment 1, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Table 2. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some elements in the lens barrel P0 and the spacer group are different.

[0110] Fig. 6A The axial chromatic aberration curve of the optical imaging lens of Example 1, 2 or 3 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging lens. Figure 6B The astigmatism curve of the optical imaging lens of Example 1, 2 or 3 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 6A and Figure 6B It can be seen that the optical imaging lens of Example 1, 2 or 3 can achieve good imaging quality.

[0111] Example 4

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

[0113] like Figure 7 As shown, the optical imaging lens comprises a lens barrel P0 and an optical lens group and a spacer group disposed in the lens barrel P0. The optical lens group comprises 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 in order from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. A stop STO is disposed between the third lens E3 and the fourth lens E4.

[0114] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is convex. An optical element may also be provided between the seventh lens E7 and the imaging surface S17, and the optical element may be, for example, a filter, and the optical element has an object side surface S14 (not shown) and an image side surface S15 (not shown). The light from the object can be Figure 2 The path shown passes through the surfaces S1 to S15 in sequence and is finally imaged on an imaging surface S16 (not shown).

[0115] 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 spacers can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel P0, thereby enhancing the structural stability of the optical imaging lens.

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

[0117]

[0118]

[0119] Table 3

[0120] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 4 lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59 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 reference Figure 8 An optical imaging lens according to Embodiment 5 of the present application is described.

[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 placed in the lens barrel P0. The optical lens group may 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 in sequence from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. The aperture STO is arranged 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 of this embodiment is the same as that of the optical lens group of Embodiment 4, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 3, and the aspheric coefficient table is the same as Table 4. The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some elements in the lens barrel P0 and the spacer group are different.

[0127] Example 6

[0128] The following reference Fig. 9 An optical imaging lens according to Example 6 of the present application is described.

[0129] like Fig. 9 As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The optical lens group may 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 in sequence from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. The aperture STO is arranged 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 placed on the image side of the first spacer P1 and at least partially in contact with the image side of the first spacer P1.

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

[0131] Fig. 10A The axial chromatic aberration curve of the optical imaging lens of Example 4, 5 or 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 10B The astigmatism curve of the optical imaging lens of Example 4, 5 or 6 is shown, which represents the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig. 10A and Fig. 10B It can be seen that the optical imaging lens of Example 4, 5 or 6 can achieve good imaging quality.

[0132] Example 7

[0133] The following reference Fig.11 An optical imaging lens according to Embodiment 7 of the present application is described.

[0134] like Fig.11 As shown, the optical imaging lens comprises a lens barrel P0 and an optical lens group and a spacer group disposed in the lens barrel P0. The optical lens group comprises 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 in order from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. A stop STO is disposed between the third lens E3 and the fourth lens E4.

[0135] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S11 is convex, and its image side surface is convex. The seventh lens E7 has negative focal power, and its object side surface S12 is concave, and its image side surface S13 is convex. An optical element may also be provided between the seventh lens E7 and the imaging surface S17, and the optical element may be, for example, a filter, and the optical element has an object side surface S14 (not shown) and an image side surface S15 (not shown). The light from the object can be Figure 2 The path shown passes through the surfaces S1 to S15 in sequence and is finally imaged on an imaging surface S16 (not shown).

[0136] 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 spacers can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel P0, thereby enhancing the structural stability of the optical imaging lens.

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

[0138]

[0139] Table 5

[0140] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 6 lists the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 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 reference Fig.12 An optical imaging lens according to Example 8 of the present application is described.

[0146] like Fig.12As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The optical lens group may 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 in sequence from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. The aperture STO is arranged 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 placed on the image side of the first spacer P1 and at least partially in contact with the image side of the first spacer P1.

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

[0148] Example 9

[0149] The following reference Fig.13 An optical imaging lens according to Example 9 of the present application is described.

[0150] like Fig.13 As shown, the optical imaging lens may include a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The optical lens group may 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 in sequence from the object side to the image side along the optical axis. The sixth lens E6 and the seventh lens E7 are cemented to form a cemented lens. The aperture STO is arranged 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 of this embodiment is the same as that of the optical lens group of Embodiment 7, that is, the basic parameter table of the optical imaging lens of this embodiment is the same as Table 5, and the aspheric coefficient table is the same as Table 6. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some elements in the lens barrel P0 and the spacer group are different.

[0152] Fig.14A The axial chromatic aberration curve of the optical imaging lens of Example 7, 8 or 9 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Fig. 14BThe astigmatism curves of the optical imaging lenses of Examples 7, 8 or 9 are shown, which represent the meridional image curvature and sagittal image curvature corresponding to different image heights. Fig.14A and Fig. 14B It can be seen that the optical imaging lens of Example 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, SAG12, etc. of each embodiment in Embodiments 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 such as d1s, d1m, D1s, d2m, d3s, d4s, d5m, D5m, EP01, CP1, EP12, CP2, EP23, CP3, EP34, EP45 and CP5 in each of Examples 1-9. At least some of the above parameters can be calculated according to Figure 1 The units of the parameters listed in Table 8 are all 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] Table 8 and Table 9 show the values ​​of the conditional expressions of each embodiment in Embodiments 1 to 9.

[0159]

[0160]

[0161] Table 9

[0162] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0163] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other.

Claims

1. An optical imaging lens, characterized in that: Comprising: An optical lens group, including 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, which are arranged in sequence from the object side to the image side along the optical axis; A spacer group, including a third spacer and a fourth spacer, where the third spacer is placed on the image side surface of the third lens and contacts the image side surface of the third lens, and the fourth spacer is placed on the image side surface of the fourth lens and contacts the image side surface of the fourth lens; And A lens barrel, in which the optical lens group and the spacer group are placed; Wherein, the number of lenses with a focal power in the optical imaging lens is seven; 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: -5.5 < R7×N4 / d3s < -2.0; 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: -272.0 < R9×V5 / d4s < -235.

0.

2. The optical imaging lens according to claim 1, wherein: 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; Wherein, the combined focal length f67 of the sixth lens and the seventh lens, the interval 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.

3. The optical imaging lens according to claim 1, wherein: 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; 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: -6.5 < 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 surface of the fifth spacer satisfy: -4.5 < f45 / d5m < -2.

5.

4. The optical imaging lens according to claim 1, wherein: The spacer group further includes a fifth spacer placed between and contacting the image side surfaces of the fifth lens; Wherein, the radius of curvature R14 of the image side surface of the seventh lens and the outer diameter D5m of the image side surface of the fifth spacer satisfy: -4.5 < R14 / D5m < -1.

5.

5. The optical imaging lens according to claim 1, wherein: The effective focal length f3 of the third lens and the interval distance EP34 between the third spacer and the fourth spacer along the optical axis satisfy: 1.5 < f3 / EP34 < 3.

5.

6. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer group further includes a first spacer placed on the image side surface of the first lens and contacting the image side surface of the first lens; Among them, the spacing distance EP01 between the object side end face of the lens barrel and the first spacer along the optical axis, the on-axis distance SAG12 between the intersection of the image side face of the first lens and the optical axis to the effective radius vertex of the image side face of the first lens, and the spacing distance T12 between the first lens and the second lens on the optical axis satisfy: 1.5<(SAG12+T12) / EP01≤4.

5.

7. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer set 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; 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 satisfy: -7.0 <f1×N1 / (D1s-d1s)<-2.0。 8. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer set 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; Among them, the curvature radius R2 of the image side surface of the first lens, the curvature radius 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 satisfy: 1.5<(R3×d1m) / (R2×d1s)<6.

5.

9. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer set 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; 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 the following: 2.0<(CT2+CP1) / CT1<11.

5.

10. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer set 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 spacing distance T23 between the second lens and the third lens on the optical axis and the maximum thickness CP2 of the second spacer satisfy: 2.0 <T23 / CP2<5.6。 11. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer set 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 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 satisfy: 3.5 <R5×N3 / d2m<4.6。 12. The optical imaging lens according to any one of claims 1 to 5, characterized in that: The spacer set 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 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 satisfy: 3.8 <f23 / (EP23+CP2+CP3)<7.1。 13. The optical imaging lens according to any one of claims 2 to 4, characterized in that: The spacer set further includes a first spacer and a second spacer, the first spacer is disposed on the image side surface of the first lens and in contact with the image side surface of the first lens, and the second spacer is disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; Among them, 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: 0.5<(EP45+CP5) / EP12<2.0.

Images