Optical imaging lens

Abstract

The invention discloses an optical imaging lens, which comprises a lens group and a spacing element group, and is characterized in that the lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis, the spacing distance between the first lens and the second lens on the optical axis is larger than the spacing distance between any two adjacent lenses from the first lens to the sixth lens on the optical axis. The spacing element group comprises a first spacing element; the optical imaging lens satisfies the following conditions: 1.10 lt; (R1 + R2) / (R1-R2) lt; 1.40 and 1.80 lt, 1.40 and 1.80 lt; r < 2 > / (d1s-d1m) < lt >; r1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacing element, and d1m is the inner diameter of the image side surface of the first spacing element.

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] Six-element optical imaging lenses have become mainstream and are widely used in fields such as mobile phones, VR headsets, smart watches, and smart glasses. Currently, in order to achieve the characteristic of a large field of view angle for an optical imaging lens, the first lens is usually set to have a negative focal power, and there is a relatively large air gap between the first lens located in front of the system and the second lens. However, such a setting easily generates more stray light reflections in the region between the first lens and the second lens, affecting the imaging quality of the optical imaging lens. Summary of the Invention

[0004] One aspect of the present application provides an optical imaging lens, including a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens having focal powers arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative focal power, and the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any adjacent two lenses among the first lens to the sixth lens on the optical axis; the spacer element group includes a first spacer element, and the first spacer element is disposed between the first lens and the second lens and is in contact with the image side surface of the first lens; the optical imaging lens satisfies: 1.10 < (R1 + R2) / (R1 - R2) < 1.40 and 1.80 < R2 / (d1s - d1m) < 4.70, where R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element, and d1m is the inner diameter of the image side surface of the first spacer element.

[0005] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 3.05 < EP01 / CT1 < 4.15, where EP01 is the spacing distance between the object side end surface of the lens barrel and the object side surface of the first spacer element on the optical axis, and CT1 is the central thickness of the first lens on the optical axis.

[0006] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 0.45 < f / (L - T12) < 0.55, where f is the total effective focal length of the optical imaging lens, L is the maximum distance along the optical axis from the object side end surface to the image side end surface of the lens barrel, and T12 is the spacing distance between the first lens and the second lens on the optical axis.

[0007] According to an exemplary embodiment of the present application, the optical imaging lens satisfies: 1.25 < T12 / CP1 < 1.90, where T12 is the distance between the first lens and the second lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

[0008] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, the fifth spacer element is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 0.70 < (d0m - d5m) / f5 < 1.15, where d0m is the inner diameter of the image side end surface of the lens barrel, d5m is the inner diameter of the image side surface of the fifth spacer element, and f5 is the effective focal length of the fifth lens.

[0009] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, the fifth spacer element is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 4.15 < d5m / |SAG61| < 4.25, where d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

[0010] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element, the fifth spacer element is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 4.65 < DT62 / Yc62 × (D5m / d5m) < 6.30, where DT62 is the maximum effective radius of the image side surface of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis in the effective diameter of the image side surface of the sixth lens to the optical axis; D5m is the outer diameter of the image side surface of the fifth spacer element, and d5m is the inner diameter of the image side surface of the fifth spacer element.

[0011] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element, the second spacer element is disposed between the second lens and the third lens and is in contact with the image side surface of the second lens; and the optical imaging lens satisfies: 0.25 mm < R3 / f2 × (d1m - d2s) < 0.50 mm, where R3 is the curvature radius of the object side surface of the second lens, f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

[0012] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element and a third spacer element. The second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens; and the optical imaging lens satisfies: 4.50 < (D2m - d2m) / EP23 < 6.05, where D2m is the outer diameter of the image side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and EP23 is the spacing distance between the second spacer element and the third spacer element on the optical axis.

[0013] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element and a third spacer element. The second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens; and the optical imaging lens satisfies: -20.10 < f3 / (d3s - d2m) < -5.40, where d3s is the inner diameter of the object side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and f3 is the effective focal length of the third lens.

[0014] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: -10.95 < R8 / N4 × (d4m / (2 × DT42)) < -3.40, where R8 is the curvature radius of the image side surface of the fourth lens, N4 is the refractive index of the fourth lens, d4m is the inner diameter of the image side surface of the fourth spacer element, and DT42 is the maximum effective radius of the image side surface of the fourth lens.

[0015] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: 1.50 < (D4s - d4s) / DT41 < 4.45, where D4s is the outer diameter of the object side surface of the fourth spacer element, d4s is the inner diameter of the object side surface of the fourth spacer element, and DT41 is the maximum effective radius of the object side surface of the fourth lens.

[0016] According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element and a fourth spacer element. The third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens; and the optical imaging lens satisfies: 6.65 < (D3m - d3m) / EP34 < 12.75, where D3m is the outer diameter of the image side surface of the third spacer element, d3m is the inner diameter of the image side surface of the third spacer element, and EP34 is the axial spacing distance between the third spacer element and the fourth spacer element.

[0017] According to an exemplary embodiment of the present application, the second lens, the fourth lens, and the fifth lens have positive optical powers, and the third lens and the sixth lens have negative optical powers.

[0018] Another aspect of the present application provides an optical imaging lens, including a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group is composed of a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, a fifth lens with a positive optical power, and a sixth lens with a negative optical power arranged in sequence along the optical axis from the object side to the image side; the spacer element group may include a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side surface of the first lens, and the second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens; and the optical imaging lens satisfies: 0.25 < R3 / f2×(d1m - d2s) < 0.50, where R3 is the curvature radius of the object side surface of the second lens, f2 is the effective focal length of the second lens, d2s is the inner diameter of the object side surface of the second spacer element, and d1m is the inner diameter of the image side surface of the first spacer element.

[0019] The optical imaging lens provided by the present application uses six lenses. The first lens has a negative optical power and satisfies 1.10 < (R1 + R2) / (R1 - R2) < 1.40. The axial spacing distance between the first lens and the second lens is greater than the axial spacing distance between any two adjacent lenses among the first lens to the sixth lens. The above settings help control the convergence of light rays with a large field of view, enabling the optical imaging lens to achieve the characteristics of a large field of view. However, a relatively large spacing distance will be formed between the first lens and the second lens, and more stray light reflections are likely to occur in this area. Therefore, the present application provides a first spacer element between the first lens and the second lens, and by controlling the inner diameter of the image side surface, the inner diameter of the object side surface of the first spacer element, and the curvature radius of the image side surface of the first lens to satisfy 1.80 < R2 / (d1s - d1m) < 4.70, it can effectively improve the reflected stray light in this area, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality of the optical imaging lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which: Figure 1 A schematic diagram showing the structural arrangement and some parameters of an optical imaging lens of the present application; Figure 2 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown; Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown; Figure 4 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown; Figure 5 The axial chromatic aberration curve (A1), astigmatism curve (B1), distortion curve (C1) and magnification chromatic aberration curve (D1) of the optical imaging lenses of Example 1, Example 2 and Example 3 of the present application are shown; Figure 6 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown; Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown; Figure 8 A schematic structural diagram of an optical imaging lens according to Embodiment 6 of the present application is shown; Fig. 9 The axial chromatic aberration curve (A2), astigmatism curve (B2), distortion curve (C2) and magnification chromatic aberration curve (D2) of the optical imaging lenses of Examples 4, 5 and 6 of the present application are shown; Fig.10 A schematic structural diagram of an optical imaging lens according to Embodiment 7 of the present application is shown; Fig.11 A schematic structural diagram of an optical imaging lens according to Embodiment 8 of the present application is shown; Fig.12 A schematic structural diagram of an optical imaging lens according to Embodiment 9 of the present application is shown; Fig.13 The axial chromatic aberration curve (A3), astigmatism curve (B3), distortion curve (C3) and magnification chromatic aberration curve (D3) of the optical imaging lenses of Example 7, Example 8 and Example 9 of the present application are shown; Fig.14 The ray diagram of the optical imaging lens of the present application is shown when (R1+R2) / (R1-R2)=1.12 and R2 / (d1s-d1m)=3.56 are satisfied; Fig.15The light spot diagram on the imaging surface of the optical imaging lens of the present application is shown when (R1+R2) / (R1-R2)=1.12 and R2 / (d1s-d1m)=3.56 are satisfied; Fig.16 The light diagram of the optical imaging lens of the present application is shown when (R1+R2) / (R1-R2)=1.12 and R2 / (d1s-d1m)=1.6; Fig.17 The light spot diagram on the imaging surface of the optical imaging lens of the present application when (R1+R2) / (R1-R2)=1.12 and R2 / (d1s-d1m)=1.6 is shown; Fig.18 The ray diagram of the optical imaging lens of the present application is shown when (R1+R2) / (R1-R2)=1.12 and R2 / (d1s-d1m)=5.0; Fig.19 The light spot diagram on the imaging surface of the optical imaging lens of the present application is shown when (R1+R2) / (R1-R2)=1.12 and R2 / (d1s-d1m)=5.0 are satisfied. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] In this article, the paraxial area refers to the area 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 area; 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 area. 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 imaging surface is called the image side of the lens. The judgment of the surface type in the paraxial area can be judged according to the general method in the field, for example, judging the concave and convex by the positive and negative R value (R refers to the curvature radius of the paraxial area). For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0025] 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.

[0026] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as 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.

[0027] 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 following embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. For example, the lens groups, lens barrels, and spacer element groups in the various embodiments of the present application can be combined arbitrarily, and are not limited to the lens groups in one embodiment being only combined with the lens barrels, spacer element groups, etc. of the embodiment.

[0028] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] Figure 1 The schematic diagram of the structure arrangement and some parameters of an optical imaging lens of the present application is shown exemplarily to facilitate a better understanding of the present application. Figure 1As shown, d0m is the inner diameter of the image side end face of the lens barrel, d1s is the inner diameter of the object side face of the first spacing element, d1m is the inner diameter of the image side face of the first spacing element, D2m is the outer diameter of the image side face of the second spacing element, d2m is the inner diameter of the image side face of the second spacing element, d2s is the inner diameter of the object side face of the second spacing element, d3s is the inner diameter of the object side face of the third spacing element, D3m is the outer diameter of the image side face of the third spacing element, d3m is the inner diameter of the image side face of the third spacing element, D4s is the outer diameter of the object side face of the fourth spacing element, D4m is the outer diameter of the image side face of the fourth spacing element, d4m is the inner diameter of the image side face of the fourth spacing element, d4s is the inner diameter of the object side face of the fourth spacing element, d5m is the inner diameter of the image side face of the fifth spacing element, D5m is the outer diameter of the image side face of the fifth spacing element, EP 01 is the spacing distance between the object side end face of the lens barrel and the object side face of the first spacing element on the optical axis, EP23 is the spacing distance between the second spacing element and the third spacing element on the optical axis, EP34 is the spacing distance between the third spacing element and the fourth spacing element on the optical axis, DT41 is the maximum effective radius of the object side face of the fourth lens, DT42 is the maximum effective radius of the image side face of the fourth lens, DT62 is the maximum effective radius of the image side face of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis in the effective diameter of the image side face of the sixth lens to the optical axis, SAG61 is the axial distance between the intersection of the object side face of the sixth lens and the optical axis to the vertex of the effective radius of the object side face of the sixth lens, CP1 is the maximum thickness of the first spacing element along the optical axis, and L is the maximum distance from the object side end face of the lens barrel to the image side end face along the optical axis.

[0030] refer to Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Fig.10 , Fig.11 and Fig.12 In a first aspect of the present application, an optical imaging lens is provided, which may include a six-piece lens group, and the six-piece lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. Each lens has at least an object side surface facing the object side and an image side surface facing the imaging side. Among the first lens to the sixth lens, any two adjacent lenses may have a spacing distance, and the spacing distance may be an air spacing.

[0031] In an exemplary embodiment, the first lens may have negative optical power. The second lens may have positive optical power. The third lens may have negative optical power. The fourth lens may have positive optical power. The fifth lens may have positive optical power. The sixth lens may have negative optical power.

[0032] In an exemplary embodiment, the optical imaging lens further includes a spacer element group, and the spacer element group may include at least one spacer element. It should be understood that the present application does not specifically limit the number of spacer elements, and any number of spacer elements may be included between any two lenses, and the entire optical imaging lens may also include any number of spacer elements. Reasonable use of spacer elements helps the optical imaging lens intercept redundant refractive and reflective light paths, reduce stray light and ghosting, and improve the imaging quality of the optical imaging lens.

[0033] In an exemplary embodiment, the optical imaging lens further includes a lens barrel. The lens group and the spacer element group are placed in the lens barrel. The lens barrel includes 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 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. In some embodiments, the inner annular surface may be stepped, for example, the inner diameter of the inner annular surface gradually decreases from the image side end face to the object side end face in a stepped manner, and correspondingly, the outer diameter of the outer annular surface tends to decrease from the image side end face to the object side end face.

[0034] In an exemplary embodiment, the optical imaging lens may further include a stop for limiting the light beam. It should be noted that the stop may be disposed between or on one side of any lens according to actual needs, for example, the stop is disposed between the second lens and the third lens.

[0035] The first aspect of the present application provides such an optical imaging lens, which may include a lens group, a spacer element group and a lens barrel, wherein the lens group and the spacer element group are arranged in the lens barrel. The lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The first lens has a negative optical focal length, and the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any two adjacent lenses from the first lens to the sixth lens on the optical axis. The optical imaging lens satisfies: 1.10<(R1+R2) / (R1-R2)<1.40. The above setting helps to control the convergence of light with a larger field of view angle, ensuring that the lens achieves a good large field of view characteristic. However, while ensuring the large field of view characteristic, a large spacing distance is formed between the first lens and the second lens, and more stray light reflections are easily generated in this area, which seriously affects the imaging clarity.

[0036] In an exemplary embodiment, the spacer element group may include a first spacer element disposed between the first lens and the second lens and at least partially in contact with the image side surface of the first lens. The optical imaging lens may satisfy: 1.80 < R2 / (d1s - d1m) < 4.70. By controlling the inner diameter of the image side surface, the inner diameter of the object side surface of the first spacer element, and the curvature radius of the image side surface of the first lens within appropriate ranges, the reflected stray light between the first lens and the second lens can be effectively improved, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality of the optical imaging lens.

[0037] The optical imaging lens provided in this application uses six lenses. The first lens has a negative optical power and satisfies 1.10 < (R1 + R2) / (R1 - R2) < 1.40. The spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any two adjacent lenses among the first lens to the sixth lens on the optical axis. The above settings help control the convergence of light rays with a large field of view, enabling the optical imaging lens to achieve the characteristic of a large field of view. However, a relatively large spacing distance will be formed between the first lens and the second lens, and more stray light reflections are likely to occur in this area. Therefore, this application provides a first spacer element between the first lens and the second lens, and by controlling R2 / (d1s - d1m) within an appropriate range, the inner diameter of the image side surface, the inner diameter of the object side surface of the first spacer element, and the curvature radius of the image side surface of the first lens can be controlled, thereby improving the reflected stray light in this area, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality.

[0038] The following combines Figures 14 to 19 to further illustrate that when the optical imaging lens of this application satisfies 1.10 < (R1 + R2) / (R1 - R2) < 1.40 and 1.80 < R2 / (d1s - d1m) < 4.70, the reflected stray light between the first lens and the second lens can be effectively improved, ensuring good imaging clarity.

[0039] Fig.14 and Fig.15 respectively show the ray diagram and the spot diagram on the imaging plane of the optical imaging lens 1 of this application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 3.56; Fig.16 and Fig.17 respectively show the ray diagram and the spot diagram on the imaging plane of the optical imaging lens 2 of this application when (R1 + R2) / (R1 - R2) = 1.12 and R2 / (d1s - d1m) = 1.6; Fig.18 and Fig.19The light diagram and the light spot diagram on the imaging surface of the optical imaging lens 3 of the present application are respectively shown when (R1+R2) / (R1-R2)=1.12 and R2 / (d1s-d1m)=5.0. It should be noted that the first lens of the optical imaging lens 1, the optical imaging lens 2, and the optical imaging lens 3 all have negative focal length, the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any two adjacent lenses from the first lens to the sixth lens on the optical axis, and all satisfy (R1+R2) / (R1-R2)=1.12. The difference between the optical imaging lens 1, the optical imaging lens 2, and the optical imaging lens 3 is that the value of R2 / (d1s-d1m) is different.

[0040] When (R1+R2) / (R1-R2)=1.12 is satisfied for the optical imaging lens 1, the optical imaging lens 2 and the optical imaging lens 3, it is helpful to control the convergence of light with a larger field angle, but a larger spacing distance will be formed between the first lens and the second lens, and more stray light reflections are likely to be generated in this area. Fig.14 The optical imaging lens 1 can reasonably control the inner diameter of the image side surface and the object side surface of the first spacing element and the radius of curvature of the first lens by controlling R2 / (d1s-d1m) within the range specified in the present application, so that the stray light is intercepted by the first spacing element and cannot propagate to the imaging surface, and the light within the effective diameter position will not form internal reflected stray light at the inner diameter edge position of the object side surface of the first spacing element, thereby improving the reflected stray light in this area, making the imaging of the optical imaging lens clearer and significantly improving the imaging quality. Fig.15 It can be seen that the spot energy of the stray light on the imaging plane is low.

[0041] Fig.16 The R2 / (d1s-d1m) of the optical imaging lens 2 is smaller than the range specified in the present application, and the difference between d1s and d1m is too large. More specifically, d1s is too large, and the first spacer element cannot play the role of intercepting stray light. The light at the non-effective diameter is easily reflected onto the inner diameter surface of the first spacer, causing a strong stray light risk and affecting the imaging quality of the optical imaging lens. Fig.17 It can be seen from the figure that the spot energy of the stray light on the imaging surface is relatively high.

[0042] Fig.18 The R2 / (d1s-d1m) of the optical imaging lens 3 is greater than the range specified in the present application, and the difference between d1s and d1m is too small. More specifically, d1s is too small and is close to d1m. The light within the effective diameter position of the first lens is likely to form internal reflected stray light at the inner diameter edge position of the object side of the first spacing element, affecting the imaging quality of the optical imaging lens. Fig.19 It can be seen that the spot energy of the stray light on the imaging plane is very high.

[0043] In an exemplary embodiment, the spacer element group may include a first spacer element disposed between the first lens and the second lens and in contact with the image side surface of the first lens; the optical imaging lens satisfies: 3.05 < EP01 / CT1 < 4.15, where EP01 is the distance between the object-side end face of the lens barrel and the object-side surface of the first spacer element on the optical axis, and CT1 is the central thickness of the first lens on the optical axis. By controlling the above conditions, it is beneficial to reasonably control the thickness of the front end portion of the lens barrel facing the object side and the edge thickness of the first lens, ensure the thickness uniformity of the front end portion of the lens barrel and the other parts of the lens barrel as a whole, and facilitate the molding of the lens barrel; and by reasonably controlling the edge thickness and the central thickness of the first lens, it is beneficial to ensure the molding of the first lens.

[0044] In an exemplary embodiment, the optical imaging lens satisfies: 0.45 < f / (L - T12) < 0.55, where f is the total effective focal length of the optical imaging lens, L is the maximum distance along the optical axis from the object-side end face to the image-side end face of the lens barrel, and T12 is the distance between the first lens and the second lens on the optical axis. By controlling the above conditions, the maximum value of the distance between any two adjacent lenses in the lens group on the optical axis and the total length of the lens can be restricted, which is beneficial to controlling the maximum value of the distance between any two adjacent lenses in the lens group on the optical axis, preventing the distance from being too large, and during the baking process of the lens, causing the air in the distance to expand due to heat, resulting in the lens floating up and affecting the performance of the lens.

[0045] In an exemplary embodiment, the optical imaging lens satisfies: 1.25 < T12 / CP1 < 1.90, where T12 is the distance between the first lens and the second lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis. By controlling the above conditions, the ratio of the distance between the first lens and the second lens on the optical axis to the maximum thickness of the first spacer element along the optical axis can be restricted, which is beneficial to minimizing the mechanical sensitivity of the lens to axial force and reducing the optical sensitivity of the lens to the lowest level.

[0046] In an exemplary embodiment, the spacer element group may include a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 0.70 < (d0m - d5m) / f5 < 1.15, where d0m is the inner diameter of the image-side end surface of the lens barrel, d5m is the inner diameter of the image side surface of the fifth spacer element, and f5 is the effective focal length of the fifth lens. By controlling the above conditions, it is beneficial to limit the outer diameter difference between each lens within a certain range, which is beneficial to the stability during the lens assembly process, ensuring the assembly yield of the lens. At the same time, limiting the inner diameter of the image-side end surface of the lens barrel ensures the assembly bearing stability of the lens, preventing large bearing misalignment; and by limiting the effective focal length of the fifth lens, it is beneficial to ensure the convergence of light after passing through the fifth lens.

[0047] In an exemplary embodiment, the spacer element group may include a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 4.15 < d5m / |SAG61| < 4.25, where d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens. By controlling the above conditions, it is beneficial to ensure the curvature of the object side surface of the sixth lens, preventing problems where the forming die of the lens cannot be processed due to an excessive angle between the effective diameter part of the lens and the flange surface connection part. At the same time, limiting the inner diameter of the image side surface of the fifth spacer element is beneficial to improving the stray light phenomenon of the light emitted from the lens.

[0048] In an exemplary embodiment, the spacer element group may include a fifth spacer element disposed between the fifth lens and the sixth lens and in contact with the image side surface of the fifth lens; and the optical imaging lens satisfies: 4.65 < DT62 / Yc62 × (D5m / d5m) < 6.30, where DT62 is the maximum effective radius of the image side surface of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis on the effective diameter of the image side surface of the sixth lens to the optical axis; D5m is the outer diameter of the image side surface of the fifth spacer element, and d5m is the inner diameter of the image side surface of the fifth spacer element. In the actual processing of the shape of the sixth lens, problems such as welding marks are likely to occur. By controlling the above conditions, the shape of the sixth lens is improved, which is beneficial to ensuring the processing feasibility of the sixth lens. At the same time, by limiting the inner and outer diameters of the image side surface of the fifth spacer element, it is beneficial to improving the stray light phenomenon of the light emitted from the lens.

[0049] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and contacts the image side surface of the first lens, and the second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens. And the optical imaging lens satisfies: 0.25 < R3 / f2×(d1m - d2s) < 0.50, where R3 is the radius of curvature of the object side surface of the second lens, f2 is the effective focal length of the second lens, d2s is the inner diameter of the object side surface of the second spacer element, and d1m is the inner diameter of the image side surface of the first spacer element. By controlling the above conditions, it is possible to ensure the surface shape of the object side surface of the second lens, keep it stable before and after the reliability test, and reduce the influence of the surface shape on the optical performance of the lens. In addition, by controlling the inner diameter of the image side surface of the first spacer element and the inner diameter of the object side surface of the second spacer element, it is beneficial to improve the stray light phenomenon at the flange position of the second lens.

[0050] In an exemplary embodiment, the spacer element group further includes a second spacer element and a third spacer element. The second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens. And the optical imaging lens satisfies: 4.50 < (D2m - d2m) / EP23 < 6.05, where D2m is the outer diameter of the image side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and EP23 is the axial spacing distance between the second spacer element and the third spacer element. By controlling the above conditions, it is beneficial to block the stray light reflected by the first lens and the second lens from entering the rear lens group through the second spacer element, improve the stray light quality of the lens, and by restricting the edge thickness of the third lens, it is beneficial to ensure the forming feasibility of the third lens.

[0051] In an exemplary embodiment, the spacer element group further includes a second spacer element and a third spacer element. The second spacer element is disposed between the second lens and the third lens and contacts the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and contacts the image side surface of the third lens. And the optical imaging lens satisfies: -20.10 < f3 / (d3s - d2m) < -5.40, where d3s is the inner diameter of the object side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and f3 is the effective focal length of the third lens. By controlling the above conditions, it is beneficial to ensure the improvement effect of the stray light at the flange position of the third lens for the light passing through, ensure the imaging quality of the lens, and by restricting the effective focal length of the third lens, it is beneficial to ensure the accurate transmission of the light.

[0052] In an exemplary embodiment, the spacer element group further includes a fourth spacer element, which is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; the optical imaging lens satisfies: -10.95 < R8 / N4 × (d4m / (2 × DT42)) < -3.40, where R8 is the radius of curvature of the image side surface of the fourth lens, N4 is the refractive index of the fourth lens, d4m is the inner diameter of the image side surface of the fourth spacer element, and DT42 is the maximum effective radius of the image side surface of the fourth lens. By restricting the refractive index of the fourth lens and the degree of curvature of the image side surface, it is beneficial to improve the ghost image generated by the effective diameter reflection passing through the image side surface of the fourth lens, reduce the energy intensity threshold of the lens ghost image to the lowest level, and ensure the imaging quality of the lens.

[0053] In an exemplary embodiment, the spacer element group further includes a fourth spacer element, which is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; and the optical imaging lens satisfies: 1.50 < (D4s - d4s) / DT41 < 4.45, where D4s is the outer diameter of the object side surface of the fourth spacer element, d4s is the inner diameter of the object side surface of the fourth spacer element, and DT41 is the maximum effective radius of the object side surface of the fourth lens. By controlling the above conditions, the bearing space of the image side surface of the fourth lens is ensured, the stability of the assembly during the assembly of the fifth lens and the sixth lens is ensured, and at the same time, by restricting the maximum effective radius (i.e., the light passing aperture) of the object side surface of the fourth lens, it is beneficial to ensure the accurate transmission of light.

[0054] In an exemplary embodiment, the spacer element group further includes a third spacer element and a fourth spacer element. The third spacer element is disposed between the third lens and the fourth lens and is in contact with the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; and the optical imaging lens satisfies: 6.65 < (D3m - d3m) / EP34 < 12.75, where D3m is the outer diameter of the image side surface of the third spacer element, d3m is the inner diameter of the image side surface of the third spacer element, and EP34 is the spacing distance between the third spacer element and the fourth spacer element on the optical axis. By controlling the above conditions, the inner and outer diameters of the image side surface of the third spacer element and the edge thickness of the fourth lens are restricted, which is beneficial to reducing the internal reflection stray light in the fourth lens and improving the stray light quality of the lens.

[0055] In an exemplary embodiment, the above optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0056] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the sixth lens is an aspherical mirror 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 occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side and image side of all lenses from the first lens to the sixth lens are aspherical mirror surfaces.

[0057] It should be understood that the present application is concerned with the performance optimization of the six-piece lens. Specifically, the present application is concerned with how to overcome the problem that, for example, the first lens has a negative optical power, a large spacing distance is formed between the first lens and the second lens, and more stray light reflections are easily generated in this area, or the problem of poor assembly stability due to the large step difference between the lens and the supporting member, how to improve the stray light problem at the flange position of the second lens, etc. The specific optical power distribution of the six lenses and the surface configuration of each lens are not the focus of the present application, and these settings can be adjusted accordingly as needed. In other words, although several specific optical power distributions and surface configurations are shown for the lens group in the embodiments of the present application, it should be understood that these embodiments are only exemplary, and the lens group in the present application should not be limited to the several specific situations shown in the embodiments.

[0058] The optical imaging lens according to the above-mentioned embodiment of the present application may use multiple lenses, such as the six lenses mentioned above. However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses and spacer elements constituting the optical imaging lens may be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the optical imaging lens is not limited to including six lenses. If necessary, the optical imaging lens may also include other numbers of lenses.

[0059] Specific embodiments of the optical imaging lens applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0060] Example 1

[0061] Figure 2 FIG. 1 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 1 of the present application. Figure 2As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. A stop STO (not shown) is located between the second lens E2 and the third lens E3.

[0062] 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 convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave.

[0063] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0064] The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5.

[0065] In the example, light from an object sequentially passes through the surfaces S1 to S12 and is finally imaged on an imaging plane IMA (not shown).

[0066] Table 1 shows the basic parameters of the lens group of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0067] Table 1

[0068] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula: (1); 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, A10, A12, A14, and A16 that can be used for each aspheric surface S1 to S12 in Example 1.

[0069] Table 2

[0070] Example 2

[0071] Figure 3 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of the present application. Figure 3 As shown, the optical imaging lens includes a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The aperture STO (not shown) is located between the second lens E2 and the third lens E3. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0072] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 1. The basic parameters thereof are detailed in Tables 1 and 2 and will not be described in detail.

[0073] The difference between this embodiment and Embodiment 1 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0074] Example 3

[0075] Figure 4 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of the present application. Figure 4As shown, the optical imaging lens includes a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The aperture STO (not shown) is located between the second lens E2 and the third lens E3. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0076] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 1. The basic parameters thereof are detailed in Tables 1 and 2 and will not be described in detail.

[0077] The difference between this embodiment and Embodiment 1 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0078] Figure 5 (A1) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Figure 5 (B1) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 1 to 3, which represent the meridional field curvature and the sagittal field curvature. Figure 5 (C1) in the figure shows the distortion curves of the optical imaging lenses of Examples 1 to 3, which represent the distortion values ​​corresponding to different field angles. Figure 5 (D1) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 1 to 3, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Figure 5 It can be seen that the optical imaging lenses provided in Examples 1 to 3 can achieve good imaging quality.

[0079] Example 4

[0080] Figure 6 FIG. 4 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of the present application. Figure 6 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. A stop STO (not shown) is located between the second lens E2 and the third lens E3.

[0081] 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 convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave.

[0082] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0083] The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5.

[0084] In the example, light from an object sequentially passes through the surfaces S1 to S12 and is finally imaged on an imaging plane IMA (not shown).

[0085] Table 3 shows the basic parameters of the lens group of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0086] Table 3

[0087] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by, but not limited to, the aspherical surface formula (1) in Embodiment 1. Table 4 lists the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface S1 to S12 in Embodiment 4.

[0088] Table 4

[0089] Example 5

[0090] Figure 7 FIG. 5 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of the present application. Figure 7 As shown, the optical imaging lens includes a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The aperture STO (not shown) is located between the second lens E2 and the third lens E3. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0091] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Embodiment 4. The basic parameters thereof are detailed in Tables 3 and 4 and will not be described in detail.

[0092] The difference between this embodiment and Embodiment 4 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0093] Example 6

[0094] Figure 8 FIG. 6 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 6 of the present application. Figure 8 As shown, the optical imaging lens includes a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The aperture STO (not shown) is located between the second lens E2 and the third lens E3. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0095] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Embodiment 4. The basic parameters thereof are detailed in Tables 3 and 4 and will not be described in detail.

[0096] The difference between this embodiment and Embodiment 4 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0097] Fig. 9 (A2) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig. 9(B2) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 4 to 6, which represent the meridional field curvature and the sagittal field curvature. Fig. 9 (C2) in the figure shows the distortion curves of the optical imaging lenses of Examples 4 to 6, which represent the distortion values ​​corresponding to different field angles. Fig. 9 (D2) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 4 to 6, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig. 9 It can be seen that the optical imaging lenses provided in Examples 4 to 6 can achieve good imaging quality.

[0098] Example 7

[0099] Fig.10 FIG. 2 shows a schematic diagram of the structure of an optical imaging lens according to Embodiment 7 of the present application. Fig.10 As shown, the optical imaging lens comprises a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group comprises, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. A stop STO (not shown) is located between the second lens E2 and the third lens E3.

[0100] 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 convex. The third lens E3 has negative focal power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is concave.

[0101] The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0102] The first spacer element P1 is placed between the first lens E1 and the second lens E2, and the object side surface of the first spacer element P1 is at least partially in contact with the image side surface S2 of the first lens E1. The second spacer element P2 is placed between the second lens E2 and the third lens E3, and the object side surface of the second spacer element P2 is at least partially in contact with the image side surface S4 of the second lens E2. The third spacer element P3 is placed between the third lens E3 and the fourth lens E4, and the object side surface of the third spacer element P3 is at least partially in contact with the image side surface S6 of the third lens E3. The fourth spacer element P4 is placed between the fourth lens E4 and the fifth lens E5, and the object side surface of the fourth spacer element P4 is at least partially in contact with the image side surface S8 of the fourth lens E4. The fifth spacer element P5 is placed between the fifth lens E5 and the sixth lens E6, and the object side surface of the fifth spacer element P5 is at least partially in contact with the image side surface S10 of the fifth lens E5.

[0103] In the example, light from an object sequentially passes through the surfaces S1 to S12 and is finally imaged on an imaging plane IMA (not shown).

[0104] Table 5 shows the basic parameters of the lens group of the optical imaging lens of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0105] Table 5

[0106] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the sixth lens E6 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by, but not limited to, the aspherical surface formula (1) in Embodiment 1. Table 6 shows the high-order coefficients A4, A6, A8, A10, A12, A14, and A16 of each aspherical surface S1 to S12 that can be used in Embodiment 7.

[0107] Table 6

[0108] Example 8

[0109] Fig.11 FIG. 8 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 8 of the present application. Fig.11 As shown, the optical imaging lens includes a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The aperture STO (not shown) is located between the second lens E2 and the third lens E3. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0110] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 7. The basic parameters thereof are detailed in Tables 5 and 6 and will not be described in detail.

[0111] The difference between this embodiment and Embodiment 7 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0112] Example 9

[0113] Fig.12 FIG. 1 is a schematic diagram showing the structure of an optical imaging lens according to Embodiment 9 of the present application. Fig.12 As shown, the optical imaging lens includes a lens barrel, a six-piece lens group and a spacer element group arranged in the lens barrel. The six-piece lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5 and a sixth lens E6. The aperture STO (not shown) is located between the second lens E2 and the third lens E3. The spacer element group includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4 and a fifth spacer element P5.

[0114] The six-lens group of the optical imaging lens of this embodiment has the same structure as the six-lens group of the optical imaging lens in Example 7. The basic parameters thereof are detailed in Tables 5 and 6 and will not be described in detail.

[0115] The difference between this embodiment and Embodiment 7 is that the lens barrel and at least some elements in the spacer element group have different structural dimensions.

[0116] Fig.13 (A3) in FIG. 1 shows the axial chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which indicate the deviation of light rays of different wavelengths from the focal point behind the lens. Fig.13 (B3) in FIG. 1 shows the astigmatism curves of the optical imaging lenses of Examples 7 to 9, which represent the meridional field curvature and the sagittal field curvature. Fig.13 (C3) in the figure shows the distortion curves of the optical imaging lenses of Examples 7 to 9, which represent the distortion values ​​corresponding to different field angles. Fig.13 (D3) in FIG. 1 shows the magnification chromatic aberration curves of the optical imaging lenses of Examples 7 to 9, which represent the deviations of different image heights on the imaging surface after the light passes through the lens. Fig.13 It can be seen that the optical imaging lenses provided in Examples 7 to 9 can achieve good imaging quality.

[0117] Table 7 shows the values ​​of parameters f, f1, f2, f3, f4, f5, f6, SAG61, DT41, DT42, DT62, and Yc62 of each embodiment in Embodiments 1 to 9. The units of the parameters listed in Table 7 are all millimeters (mm).

[0118] Table 7

[0119] Table 8 gives the values ​​of parameters of at least some elements in the lens barrel and the spacer element group of each embodiment in embodiments 1 to 9. Among them, the parameters listed in Table 8 can be calculated according to Figure 1 The units of the parameters listed in Table 8 are all millimeters (mm).

[0120] Table 8

[0121] In summary, the optical imaging lenses of Examples 1 to 9 satisfy the relationship shown in Table 9.

[0122] Table 9

[0123] The present application also provides an electronic device equipped with the optical imaging lens described above. The electronic device can be a wearable device such as a smart watch or smart glasses, an independent imaging device such as a distance detection camera, an independent imaging device such as a vehicle-mounted camera, a mobile electronic device such as a mobile phone or a tablet computer, an imaging module integrated in a distance detection device, or an imaging module integrated in an auxiliary driving system.

[0124] 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 invention 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 (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical imaging lens, characterized in that: Comprising: A lens group, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens with optical powers arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative optical power, and the spacing distance between the first lens and the second lens on the optical axis is greater than the spacing distance between any two adjacent lenses among the first lens to the sixth lens on the optical axis; A spacer element group, including a first spacer element, which is placed between the first lens and the second lens and is in contact with the image side surface of the first lens; and A lens barrel, which houses the lens group and the spacer element group; The optical imaging lens satisfies: 1.10 < (R1 + R2) / (R1 - R2) < 1.40 and 1.80 < R2 / (d1s - d1m) < 4.70; Wherein, R1 is the curvature radius of the object side surface of the first lens, R2 is the curvature radius of the image side surface of the first lens, d1s is the inner diameter of the object side surface of the first spacer element, and d1m is the inner diameter of the image side surface of the first spacer element.

2. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 3.05 < EP01 / CT1 < 4.15, where EP01 is the spacing distance between the object side end surface of the lens barrel and the object side surface of the first spacer element on the optical axis, and CT1 is the central thickness of the first lens on the optical axis.

3. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 0.45 < f / (L - T12) < 0.55, where f is the total effective focal length of the optical imaging lens, L is the maximum distance from the object side end surface to the image side end surface of the lens barrel along the optical axis direction, and T12 is the spacing distance between the first lens and the second lens on the optical axis.

4. The optical imaging lens according to claim 1, wherein: The optical imaging lens satisfies: 1.25 < T12 / CP1 < 1.90, where T12 is the spacing distance between the first lens and the second lens on the optical axis, and CP1 is the maximum thickness of the first spacer element along the optical axis direction.

5. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fifth spacer element, which is placed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and The optical imaging lens satisfies: 0.70 < (d0m - d5m) / f5 < 1.15, where d0m is the inner diameter of the image side end surface of the lens barrel, d5m is the inner diameter of the image side surface of the fifth spacer element, and f5 is the effective focal length of the fifth lens.

6. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fifth spacer element, which is placed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and The optical imaging lens satisfies: 4.15 < d5m / |SAG61| < 4.25, where d5m is the inner diameter of the image side surface of the fifth spacer element, and SAG61 is the axial distance between the intersection of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens.

7. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fifth spacer element, which is disposed between the fifth lens and the sixth lens and is in contact with the image side surface of the fifth lens; and The optical imaging lens satisfies: 4.65 < DT62 / Yc62×(D5m / d5m) < 6.30, where DT62 is the maximum effective radius of the image side surface of the sixth lens, Yc62 is the distance from the inflection point farthest from the optical axis to the optical axis among the effective diameters of the image side surface of the sixth lens; D5m is the outer diameter of the image side surface of the fifth spacer element, and d5m is the inner diameter of the image side surface of the fifth spacer element.

8. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element, which is disposed between the second lens and the third lens and is in contact with the image side surface of the second lens; and The optical imaging lens satisfies: 0.25mm < R3 / f2×(d1m - d2s) < 0.50mm, where R3 is the curvature radius of the object side surface of the second lens, f2 is the effective focal length of the second lens, and d2s is the inner diameter of the object side surface of the second spacer element.

9. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element and a third spacer element. The second spacer element is disposed between the second lens and the third lens and is in contact with the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and is in contact with the image side surface of the third lens; and The optical imaging lens satisfies: 4.50 < (D2m - d2m) / EP23 < 6.05, where D2m is the outer diameter of the image side surface of the second spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and EP23 is the spacing distance between the second spacer element and the third spacer element on the optical axis.

10. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a second spacer element and a third spacer element. The second spacer element is disposed between the second lens and the third lens and is in contact with the image side surface of the second lens, and the third spacer element is disposed between the third lens and the fourth lens and is in contact with the image side surface of the third lens; and The optical imaging lens satisfies: -20.10 < f3 / (d3s - d2m) < -5.40, where d3s is the inner diameter of the object side surface of the third spacer element, d2m is the inner diameter of the image side surface of the second spacer element, and f3 is the effective focal length of the third lens.

11. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fourth spacer element, which is disposed between the fourth lens and the fifth lens and is in contact with the image side surface of the fourth lens; and The optical imaging lens satisfies: -10.95 < R8 / N4×(d4m / (2×DT42)) < -3.40, where R8 is the curvature radius of the image side surface of the fourth lens, N4 is the refractive index of the fourth lens, d4m is the inner diameter of the image side surface of the fourth spacer element, and DT42 is the maximum effective radius of the image side surface of the fourth lens.

12. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a fourth spacer element, the fourth spacer element being disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; and The optical imaging lens satisfies: 1.50<(D4s-d4s) / DT41<4.45, wherein D4s is the outer diameter of the object side surface of the fourth spacing element, d4s is the inner diameter of the object side surface of the fourth spacing element, and DT41 is the maximum effective radius of the object side surface of the fourth lens.

13. The optical imaging lens according to any one of claims 1 to 4, wherein: The spacer element group further includes a third spacer element and a fourth spacer element, the third spacer element is disposed between the third lens and the fourth lens and in contact with the image side surface of the third lens, and the fourth spacer element is disposed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; and The optical imaging lens satisfies: 6.65<(D3m-d3m) / EP34<12.75, wherein D3m is the outer diameter of the image side surface of the third spacer element, d3m is the inner diameter of the image side surface of the third spacer element, and EP34 is the spacing distance between the third spacer element and the fourth spacer element on the optical axis.

14. The optical imaging lens according to any one of claims 1 to 4, wherein: The second lens, the fourth lens and the fifth lens have positive refractive power, and the third lens and the sixth lens have negative refractive power.

Images