Optical imaging lens

Abstract

The application discloses an optical imaging lens. The optical imaging lens comprises a lens barrel and a lens set assembled in the lens barrel. The lens set comprises, in sequence from the object side to the image side along the optical axis, a first lens with optical power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. At least two lenses among the first lens to the third lens have positive optical power; at least two lenses among the fourth lens to the seventh lens have negative optical power; and the image side surface of at least four lenses among the first lens to the seventh lens is concave. The optical imaging lens further comprises a first spacing element between the first lens and the second lens and a second spacing element between the second lens and the third lens. The optical imaging lens satisfies 1 < f1 x (d1m+D2m) / (R3 x R4) < 6.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, in particular, to an optical imaging lens. BACKGROUND

[0002] With the continuous expansion of the global mobile phone market, the functions of mobile phones are constantly improving, and users' demand for using mobile phones for photography is growing. At the same time, users have higher requirements for the shooting performance of mobile phones in different scenarios, which makes the requirements of the mobile phone industry for the software and hardware mounted on mobile phones become higher and higher. In order to improve the competitiveness of their own products, major smartphone manufacturers have put forward higher design requirements for optical imaging lenses mounted on smartphones.

[0003] In the field of optical imaging lenses, the existence of stray light phenomenon and the deviation of assembly stability seriously affect the imaging quality of the imaging lens. For example, under normal circumstances, the light power and surface shape of each lens in the optical imaging lens are not reasonably set, which may cause the deflection path of light in the optical imaging lens to be chaotic, and thus stray light is easily generated. On the other hand, if the position of the spacing element in the optical imaging lens is not reasonably designed, it may also cause the deflection path of light in the optical imaging lens to be chaotic, and thus stray light is easily generated. In addition, if the position of the spacing element in the optical imaging lens is not reasonably designed, it may also cause poor stability between each lens, and thus cause poor assembly stability of the optical imaging lens, low yield, etc.

[0004] Therefore, how to reasonably arrange each lens and spacing element in the optical imaging lens and reasonably set the optical parameters of the optical imaging lens, etc., in order to control the light trend in the optical imaging lens and optimize the assembly stability of the optical imaging lens, reduce the sensitivity of the optical imaging lens, and improve the yield of the optical imaging lens, etc. is one of the difficult problems to be solved in the field of optical imaging. SUMMARY

[0005] In one aspect, the present application provides an optical imaging lens, which includes a lens barrel and a lens assembly assembled in the lens barrel. The lens assembly includes, in order from an object side to an image side along an optical axis, a first lens having optical power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. At least two lenses among the first lens to the third lens have positive optical power; at least two lenses among the fourth lens to the seventh lens have negative optical power; and at least four lenses among the first lens to the seventh lens have a concave image side surface. The optical imaging lens further includes a first spacer element located between the first lens and the second lens, and a second spacer element located between the second lens and the third lens. The optical imaging lens can satisfy 1 < f1 x (d1m + D2m) / (R3 x R4) < 6, where f1 is an effective focal length of the first lens, R3 is a curvature radius of an object side surface of the second lens, R4 is a curvature radius of an image side surface of the second lens, d1m is an inner diameter of an image side surface of the first spacer element, and D2m is an outer diameter of an image side surface of the second spacer element.

[0006] In one embodiment, at least one of the object side surface of the first lens to the image side surface of the seventh lens is an aspheric surface.

[0007] In one embodiment, the optical imaging lens can satisfy 150 < R2 x (d1s + D1s) / (R1 x CP1) < 230, where R2 is a curvature radius of an image side surface of the first lens, R1 is a curvature radius of an object side surface of the first lens, D1s is an outer diameter of an object side surface of the first spacer element, d1s is an inner diameter of an object side surface of the first spacer element, and CP1 is a maximum thickness of the first spacer element.

[0008] In one embodiment, the optical imaging lens further includes a fourth spacer element located between the fourth lens and the fifth lens, and a fifth spacer element located between the fifth lens and the sixth lens. The optical imaging lens can satisfy 20 < (f3 x d2s x D2s) / (EP45 x d2m x D2m) < 50, where f3 is an effective focal length of the third lens, d2s is an inner diameter of an object side surface of the second spacer element, D2s is an outer diameter of an object side surface of the second spacer element, EP45 is a distance between an image side surface of the fourth spacer element and an object side surface of the fifth spacer element in a direction parallel to the optical axis, d2m is an inner diameter of an image side surface of the second spacer element, and D2m is an outer diameter of an image side surface of the second spacer element.

[0009] In an embodiment, the optical imaging lens further comprises a third spacer element located between the third lens and the fourth lens, and the optical imaging lens can satisfy: 12 < (d3s / EP23+T23 / CT3) x (L / D1m) < 22, where d3s is an inner diameter of an object side surface of the third spacer element, EP23 is a spacing distance from an image side surface of the second spacer element to the object side surface of the third spacer element in a direction parallel to the optical axis, T23 is an air spacing of the second lens and the third lens on the optical axis, CT3 is a center thickness of the third lens, L is a maximum height of the lens barrel, and D1m is an outer diameter of an image side surface of the first spacer element.

[0010] In an embodiment, the optical imaging lens can satisfy: 8 < (R13+R14+d4m+d5m) / (d5s-d4s) < 35, where R13 is a curvature radius of an object side surface of the seventh lens, R14 is a curvature radius of an image side surface of the seventh lens, d4m is an inner diameter of an image side surface of the fourth spacer element, d5m is an inner diameter of an image side surface of the fifth spacer element, d4s is an inner diameter of an object side surface of the fourth spacer element, and d5s is an inner diameter of an object side surface of the fifth spacer element.

[0011] In an embodiment, the optical imaging lens can satisfy: 12 < (T67+f x tan(FOV / 2)) / (EP01-EP12) < 28, where T67 is an air spacing of the sixth lens and the seventh lens on the optical axis, f is a total effective focal length of the optical imaging lens, FOV is a maximum field of view angle of the optical imaging lens, EP01 is a spacing distance from an object side end of the lens barrel to an object side surface of the first spacer element in a direction parallel to the optical axis, and EP12 is a spacing distance from an image side surface of the first spacer element to an object side surface of the second spacer element in a direction parallel to the optical axis.

[0012] In an embodiment, the optical imaging lens can satisfy: 21 < d3m / (D5s-D4s-T12-T34) < 48, where T12 is an air spacing of the first lens and the second lens on the optical axis, T34 is an air spacing of the third lens and the fourth lens on the optical axis, d3m is an inner diameter of an image side surface of the third spacer element, D4s is an outer diameter of an object side surface of the fourth spacer element, and D5s is an outer diameter of an object side surface of the fifth spacer element.

[0013] In an embodiment, the optical imaging lens can satisfy: 22 < (L / EP34) / (f / EPD-D4m / D3m) < 35, where L is a maximum height of the lens barrel, EP34 is a spacing distance from an image side surface of the third spacer element to an object side surface of the fourth spacer element in a direction parallel to the optical axis, f is a total effective focal length of the optical imaging lens, EPD is an entrance pupil diameter of the optical imaging lens, D4m is an outer diameter of an image side surface of the fourth spacer element, and D3m is an outer diameter of an image side surface of the third spacer element.

[0014] In one embodiment, the optical imaging lens can satisfy: 17 < (f6+R11) / (CP2+EP23+CP3) < 27, where f6 is the effective focal length of the sixth lens, R11 is the curvature radius of the object side surface of the sixth lens, CP2 is the maximum thickness of the second spacer element, EP23 is the interval distance from the image side surface of the second spacer element to the object side surface of the third spacer element in the direction parallel to the optical axis, and CP3 is the maximum thickness of the third spacer element.

[0015] In one embodiment, the optical imaging lens can satisfy: 0 < (R7+CT4-D0m) / (EP45-CP4-CP5) < 22, where R7 is the curvature radius of the object side surface of the fourth lens, CT4 is the center thickness of the fourth lens, D0m is the outer diameter of the image side end of the lens barrel, CP4 is the maximum thickness of the fourth spacer element, CP5 is the maximum thickness of the fifth spacer element, and EP45 is the interval distance from the image side surface of the fourth spacer element to the object side surface of the fifth spacer element in the direction parallel to the optical axis.

[0016] In one embodiment, the optical imaging lens satisfies: 75 < (R8 / f+d0m / d0s) x (D3s / CP1) < 105, where R8 is the curvature radius of the image side surface of the fourth lens, f is the total effective focal length of the optical imaging lens, d0m is the inner diameter of the image side end of the lens barrel, d0s is the inner diameter of the object side end of the lens barrel, D3s is the outer diameter of the object side surface of the third spacer element, and CP1 is the maximum thickness of the first spacer element.

[0017] In one embodiment, there are at least 4 spacer elements between the fourth lens and the seventh lens.

[0018] In one embodiment, the second lens has a negative refractive power, and its image side surface is concave; and the third lens has a positive refractive power, and its object side surface is concave.

[0019] In one embodiment, the fifth lens has a negative refractive power, and its object side surface is concave and its image side surface is convex; and the sixth lens has a positive refractive power, and its object side surface is convex.

[0020] In the exemplary embodiments of the present application, by reasonably controlling the optical power of each lens, such as setting at least two lenses among the first to third lenses to have positive optical power and at least two lenses among the fourth to seventh lenses to have negative optical power, the low-order aberration of the optical imaging lens can be effectively reduced, and the tolerance sensitivity of the lens can be reduced. Exemplarily, by setting a plurality of spacer elements between the first to sixth lenses, such as setting a first spacer element between the first and second lenses and a second spacer element between the second and third lenses, the propagation path of light in each lens can be reasonably controlled, and the stray light ghost of the optical imaging lens as a whole can be reduced. Exemplarily, by setting the image side surface of at least four lenses among the first to seventh lenses as a concave surface, the refraction angle of light in each lens can be effectively controlled, and each lens can have good processing characteristics. Exemplarily, the optical imaging lens satisfies 1 < f1 x (d1m + D2m) / (R3 x R4) < 6, the deflection angle of the edge field of view at the first lens can be adjusted by setting the effective focal length and the curvature radius of the first and second lenses, the chief ray among the incident light rays can be ensured to pass according to the predetermined path, and the sensitivity of the lens can be effectively reduced. In addition, by reasonably controlling the inner diameter of the first spacer element and the outer diameter of the second spacer element, the first and second spacer elements can effectively block the stray light generated by the incident light rays at the first and second lenses without affecting the path of the chief ray among the incident light rays. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figures 1A to 1C Structure schematic diagrams of the lens barrel, the lens group and each spacer element in three implementation manners of the optical imaging lens of Example 1 are respectively shown;

[0023] Figures 2A to 2C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging lens of Example 1 are respectively shown;

[0024] Figures 3A to 3C Structure schematic diagrams of the lens barrel, the lens group and each spacer element in three implementation manners of the optical imaging lens of Example 2 are respectively shown;

[0025] Figures 4A to 4C Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging lens of Example 2 are respectively shown;

[0026] Figures 5A to 5C Structure schematic diagrams of the lens barrel, the lens group and each spacer element in three implementation manners of the optical imaging lens of Example 3 are respectively shown;

[0027] Figures 6A to 6C On-axis chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging lens of Embodiment 3 are shown respectively; and

[0028] Figure 7 A partial parameter diagram of the optical imaging lens according to the embodiments of the present application is shown. DETAILED DESCRIPTION

[0029] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0030] It should be noted that, in the present specification, the expressions first, second, third and the like are merely used to distinguish one feature from another feature, and do not indicate any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens, and the first spacer element can also be referred to as the second spacer element or the third spacer element, without departing from the teachings of the present application.

[0031] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale. It should be understood that the thickness, size, and shape of the spacer elements and the lens barrel have also been slightly exaggerated in the drawings for the sake of explanation.

[0032] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging surface is referred to as the image side surface of the lens. It should be understood that the surface of each spacer element closest to the object is referred to as the object side surface of the spacer element, and the surface of each spacer element closest to the imaging surface is referred to as the image side surface of the spacer element. The surface of the lens barrel closest to the object is referred to as the object side end of the lens barrel, and the surface of the lens barrel closest to the imaging surface is referred to as the image side end of the lens barrel.

[0033] It should also be understood that the use of the terms "have", "has", "having", "include", "includes" and / or "including" when used in this specification, specifies the presence of stated features, elements and / or components, but do not preclude the presence or addition of one or more other features, elements, components and / or groups thereof. In addition, when terms such as "at least one of", "one or more of", or "at least an of are used in the detailed description and / or claims, these terms are intended to mean that the list of features preceding the term includes at least one instance of each feature in the list, but does not preclude additional instances of other features in the list or additional instances of features not in the list. Also, the use of the term "about" when used in this specification in connection with a numerical value shall mean that the value of the specified numerical value is within 10% of the indicated value unless otherwise indicated. Furthermore, when describing the embodiments of the application, the use of "can" means "one or more embodiments of the application." Also, the use of the term "exemplary" is intended to present an example or an illustration.

[0034] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0035] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The following embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as limiting the scope of the patent of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application, for example, the lens group (i.e. the first lens to the seventh lens), the lens barrel structure and the spacer element in each embodiment of the present application can be combined arbitrarily, and are not limited to the combination of the lens group, the lens barrel structure, the spacer element and the like in the embodiment. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] The features, principles, and other aspects of the present application are described in detail below.

[0037] An optical imaging lens according to an exemplary embodiment of the present application can include a lens barrel and a lens group assembled in the lens barrel. The lens group can include seven lenses having optical power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, respectively. The seven lenses are arranged in order along an optical axis from an object side to an image side. Any two adjacent lenses among the first lens to the seventh lens can have a separation distance. The lens barrel can accommodate the first lens to the seventh lens.

[0038] According to the exemplary embodiments of the present application, the first lens to the seventh lens can each have an optical region for optical imaging and a non-optical region extending outward from the periphery of the optical region. Generally, the optical region refers to the region of the lens for optical imaging, and the non-optical region refers to the structural region of the lens. In the assembly process of the optical imaging lens, a spacer element can be disposed at the non-optical region of each lens and coupled to the lens barrel respectively by a process such as point bonding. In the imaging process of the optical imaging lens, the optical region of each lens can transmit light from the object to form an optical path and form the final optical image; and the non-optical region of each lens after assembly is accommodated in the lens barrel which cannot transmit light, so that the non-optical region does not directly participate in the imaging process of the optical imaging lens. It should be noted that, for the convenience of description, the present application divides each lens into two parts, the optical region and the non-optical region, for description, but it should be understood that the optical region and the non-optical region of the lens can be formed as a whole in the manufacturing process, rather than as two separate parts.

[0039] The optical imaging lens according to the exemplary embodiments of the present application can include five spacer elements respectively located between the first lens and the sixth lens, i.e., a first spacer element, a second spacer element, a third spacer element, a fourth spacer element and a fifth spacer element. Specifically, the optical imaging lens can include the first spacer element located between the first lens and the second lens, which can abut against the non-optical area of the image side of the first lens; the second spacer element located between the second lens and the third lens, which can abut against the non-optical area of the image side of the second lens; the third spacer element located between the third lens and the fourth lens, which can abut against the non-optical area of the image side of the third lens; the fourth spacer element located between the fourth lens and the fifth lens, which can abut against the non-optical area of the image side of the fourth lens; and the fifth spacer element located between the fifth lens and the sixth lens, which can abut against the non-optical area of the image side of the fifth lens. Exemplarily, the optical imaging lens can further include a sixth spacer element located between the sixth lens and the seventh lens, which can abut against the non-optical area of the image side of the sixth lens or the non-optical area of the object side of the seventh lens. Of course, in another embodiment, the optical imaging lens can further include a seventh spacer element located at the image side of the seventh lens, which can abut against the non-optical area of the image side of the seventh lens. Exemplarily, the first spacer element can be in contact with the non-optical area of the image side of the first lens, while being in contact with the non-optical area of the object side of the second lens. For example, the object side of the first spacer element can be in contact with the non-optical area of the image side of the first lens, and the image side of the first spacer element can be in contact with the non-optical area of the object side of the second lens; and so on, the object side of the seventh spacer element can be in contact with the non-optical area of the image side of the seventh lens. The present application is advantageous in improving the performance, stability, yield, and imaging quality of the optical imaging lens by arranging multiple spacer elements on the inner wall of the lens barrel.

[0040] According to the exemplary embodiments of the present application, the spacer element can include at least one spacer piece, and by reasonably setting the number, thickness, inner diameter and outer diameter of the spacer piece, the assembly of the optical imaging lens can be improved, the stray light can be blocked, and the imaging quality of the optical imaging lens can be improved. Exemplarily, the spacer element can further include at least one spacer ring, and by controlling the thickness and structure of the spacer ring, the assembly stability of the optical imaging lens can be improved.

[0041] According to the exemplary embodiments of the present application, at least two lenses among the first lens to the third lens have positive focal power; and at least two lenses among the fourth lens to the seventh lens have negative focal power. By reasonably matching the focal power of each lens in the optical imaging lens, the present application can effectively reduce the low-order aberration of the optical imaging lens and reduce the tolerance sensitivity of the lens.

[0042] According to the exemplary embodiments of the present application, by arranging a plurality of spacer elements between the first lens to the sixth lens, such as arranging a first spacer element between the first lens and the second lens, and arranging a second spacer element between the second lens and the third lens, the propagation path of the light in each lens can be reasonably controlled, and the stray light ghost of the optical imaging lens as a whole can be reduced.

[0043] According to the exemplary embodiments of the present application, the image side surface of at least four lenses among the first lens to the seventh lens is concave. Such surface type arrangement can effectively control the refraction angle of the light in each lens, and can also make each lens have good processing characteristics.

[0044] In the exemplary embodiments, the optical imaging lens according to the present application can satisfy: 1 < f1 x (d1m + D2m) / (R3 x R4) < 6, where f1 is the effective focal length of the first lens, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, d1m is the inner diameter of the image side surface of the first spacer element, and D2m is the outer diameter of the image side surface of the second spacer element. More specifically, f1, d1m, D2m, R3 and R4 can further satisfy: 2.5 < f1 x (d1m + D2m) / (R3 x R4) < 3.5. Satisfying 1 < f1 x (d1m + D2m) / (R3 x R4) < 6 can adjust the deflection angle of the edge field of view at the first lens by setting the effective focal length and the curvature radius of the first lens and the second lens, can ensure that the chief ray among the incident light rays passes along a predetermined path, and can effectively reduce the sensitivity of the lens. In addition, by reasonably controlling the inner diameter of the first spacer element and the outer diameter of the second spacer element, the first spacer element and the second spacer element can effectively block the stray light generated by the incident light rays at the first lens and the second lens without affecting the path of the chief ray among the incident light rays.

[0045] In the exemplary embodiments, the optical imaging lens according to the present application can satisfy: 150 < R2 x (d1s + D1s) / (R1 x CP1) < 230, where R2 is the curvature radius of the image side surface of the first lens, R1 is the curvature radius of the object side surface of the first lens, D1s is the outer diameter of the object side surface of the first spacer element, d1s is the inner diameter of the object side surface of the first spacer element, and CP1 is the maximum thickness of the first spacer element. Satisfying 150 < R2 x (d1s + D1s) / (R1 x CP1) < 230 can effectively improve the assembly stability of the lens as a whole by controlling the size of the first spacer element, can reduce the yield rate of the superimposed loss of the rear lens and the spacer element in the assembly process, and can compensate for the influence of the negative deviation value caused in the lens production process by controlling the size of the first spacer element, since the distance between the first lens and the second lens can greatly affect the overall imaging performance of the lens.

[0046] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 20 < (f3 x d2s x D2s) / (EP45 x d2m x D2m) < 50, where f3 is the effective focal length of the third lens, d2s is the inner diameter of the object side surface of the second spacer element, D2s is the outer diameter of the object side surface of the second spacer element, EP45 is the interval distance between the image side surface of the fourth spacer element and the object side surface of the fifth spacer element in the direction parallel to the optical axis, d2m is the inner diameter of the image side surface of the second spacer element, and D2m is the outer diameter of the image side surface of the second spacer element. Since the gap between the fourth lens and the fifth lens generally has less impact on the overall performance of the lens than the gap between the front lenses, satisfying 20 < (f3 x d2s x D2s) / (EP45 x d2m x D2m) < 50 can reduce the risk of fluctuation and improve the imaging yield by controlling the gap between the rear lenses of the lens while ensuring optimization of the performance of the lens. Dynamically adjusting the gap between the fourth lens and the fifth lens in different product lines or in the production process of multiple sets of manufacturing equipment can also enhance the flexibility of lens product manufacturing, thereby saving resources and improving quality.

[0047] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 12 < (d3s / EP23 + T23 / CT3) x (L / D1m) < 22, where d3s is the inner diameter of the object side surface of the third spacer element, EP23 is the interval distance between the image side surface of the second spacer element and the object side surface of the third spacer element in the direction parallel to the optical axis, T23 is the air gap of the second lens and the third lens on the optical axis, CT3 is the center thickness of the third lens, L is the maximum height of the lens barrel, and D1m is the outer diameter of the image side surface of the first spacer element. Since the gap between the third lens and the fourth lens generally has less impact on the overall performance of the lens than the gap between the front lenses and more impact than the gap between the rear lenses, satisfying 12 < (d3s / EP23 + T23 / CT3) x (L / D1m) < 22 can effectively optimize the performance of the lens by setting the thickness of the third spacer element in combination with the parameters of other adjacent components. At the same time, by reasonably adjusting the gap between the third lens and the fourth lens and the gap between the fourth lens and the fifth lens, the actual production needs can be better met, which is conducive to achieving precise coverage of manufacturing resources, improving quality and yield, and other beneficial effects.

[0048] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 8 < (R13+R14+d4m+d5m) / (d5s-d4s) < 35, where R13 is the curvature radius of the object side surface of the seventh lens, R14 is the curvature radius of the image side surface of the seventh lens, d4m is the inner diameter of the image side surface of the fourth spacer element, d5m is the inner diameter of the image side surface of the fifth spacer element, d4s is the inner diameter of the object side surface of the fourth spacer element, and d5s is the inner diameter of the object side surface of the fifth spacer element. Satisfying 8 < (R13+R14+d4m+d5m) / (d5s-d4s) < 35 can effectively weaken the abnormal phenomenon of stray light generated on the fourth lens, and meanwhile, by controlling the inner diameter of the fifth spacer element, the abnormal phenomenon such as undesirable deformation of the fourth spacer element in the assembly process can be reduced.

[0049] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 12 < (T67+f x tan(FOV / 2)) / (EP01-EP12) < 28, where T67 is the air gap of the sixth lens and the seventh lens on the optical axis, f is the total effective focal length of the optical imaging lens, FOV is the maximum field of view angle of the optical imaging lens, EP01 is the interval distance of the object side end of the lens barrel to the object side surface of the first spacer element in the direction parallel to the optical axis, and EP12 is the interval distance of the image side surface of the first spacer element to the object side surface of the second spacer element in the direction parallel to the optical axis. More specifically, T67, f, FOV, EP01 and EP12 can further satisfy: 15 < (T67+f x tan(FOV / 2)) / (EP01-EP12) < 25. Since the interval between the seventh lens and the sixth lens is large, various abnormalities are prone to occur in the production process. Therefore, satisfying 12 < (T67+f x tan(FOV / 2)) / (EP01-EP12) < 28 can reduce the influence of some conventional abnormalities to a certain extent, such as the influence caused by assembly eccentricity, assembly tilt, deviation in relative angle, etc., thereby optimizing the imaging performance of the lens.

[0050] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 21 < d3m / (D5s-D4s-T12-T34) < 48, where T12 is the air gap of the first lens and the second lens on the optical axis, T34 is the air gap of the third lens and the fourth lens on the optical axis, d3m is the inner diameter of the image side surface of the third spacer element, D4s is the outer diameter of the object side surface of the fourth spacer element, and D5s is the outer diameter of the object side surface of the fifth spacer element. Satisfying 21 < d3m / (D5s-D4s-T12-T34) < 48 is conducive to adjusting the lens performance by using the spacer element in the production process, reducing the influence of assembly on the imaging performance of the lens, and thus improving the yield of the lens.

[0051] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 22 < (L / EP34) / (f / EPD-D4m / D3m) < 35, where L is the maximum height of the lens barrel, EP34 is the interval distance of the image side surface of the third spacer element to the object side surface of the fourth spacer element in the direction parallel to the optical axis, f is the total effective focal length of the optical imaging lens, EPD is the entrance pupil diameter of the optical imaging lens, D4m is the outer diameter of the image side surface of the fourth spacer element, and D3m is the outer diameter of the image side surface of the third spacer element. Satisfying 22 < (L / EP34) / (f / EPD-D4m / D3m) < 35 is conducive to reducing the generation of stray light of the lens and controlling the gap between adjacent lenses, thereby improving the yield rate in the lens manufacturing process.

[0052] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 17 < (f6+R11) / (CP2+EP23+CP3) < 27, where f6 is the effective focal length of the sixth lens, R11 is the radius of curvature of the object side surface of the sixth lens, CP2 is the maximum thickness of the second spacer element, EP23 is the interval distance of the image side surface of the second spacer element to the object side surface of the third spacer element in the direction parallel to the optical axis, and CP3 is the maximum thickness of the third spacer element. Satisfying 17 < (f6+R11) / (CP2+EP23+CP3) < 27 can reduce the risk of stray light to a certain extent, improve the overall performance of the lens and stability in the manufacturing process.

[0053] In exemplary embodiments, the optical imaging lens according to the present application can satisfy: 0 < (R7+CT4-D0m) / (EP45-CP4-CP5) < 22, where R7 is the radius of curvature of the object side surface of the fourth lens, CT4 is the center thickness of the fourth lens, D0m is the outer diameter of the image side end of the lens barrel, CP4 is the maximum thickness of the fourth spacer element, CP5 is the maximum thickness of the fifth spacer element, and EP45 is the interval distance of the image side surface of the fourth spacer element to the object side surface of the fifth spacer element in the direction parallel to the optical axis. Satisfying 0 < (R7+CT4-D0m) / (EP45-CP4-CP5) < 22 can effectively reduce the negative impact of external force on the fourth lens during assembly and reduce the phenomenon of excessive deformation of the fourth and fifth spacer elements during assembly, thereby reducing the overall performance quality of the lens.

[0054] In the exemplary embodiments, the optical imaging lens according to the present application can satisfy: 75 < (R8 / f+d0m / d0s) x (D3s / CP1) < 105, wherein R8 is the radius of curvature of the image side surface of the fourth lens, f is the total effective focal length of the optical imaging lens, d0m is the inner diameter of the image side end of the lens barrel, d0s is the inner diameter of the object side end of the lens barrel, D3s is the outer diameter of the object side surface of the third spacer element, and CP1 is the maximum thickness of the first spacer element. Satisfying 75 < (R8 / f+d0m / d0s) x (D3s / CP1) < 105 can effectively reduce abnormal stray light, improve the imaging performance of the lens, and not affect the appearance of the lens.

[0055] According to the exemplary embodiments of the present application, there are at least four spacer elements between the fourth lens and the seventh lens. Generally, in the lens design process, the seventh lens is often spaced apart from the front lens, which is easy to cause abnormal stray light and other phenomena. The present application can maximize the reduction of the special structure of the fourth lens, the fifth lens, the sixth lens and the seventh lens caused by the difference in spacing and outer diameter while ensuring that the abnormal stray light is not increased, thereby improving the stability of the lens in the production process such as molding and assembly.

[0056] According to the exemplary embodiments of the present application, the second lens can have a negative focal power, and the image side surface thereof can be a concave surface; and the third lens can have a positive focal power, and the object side surface thereof can be a concave surface. The focal power and surface type of the second lens and the third lens are beneficial to optimizing the performance of the optical imaging lens and making the two lenses relatively thin. Since the gap between the second lens and the third lens greatly affects the overall defocus performance of the lens, by setting the focal power and surface type of the second lens and the third lens, the deformation trend can be guided to a smaller magnitude of overall performance loss in some extreme conditions or destructive test conditions, thereby improving the reliability of the lens in actual use.

[0057] According to the exemplary embodiments of the present application, the fifth lens has a negative focal power, and the object side surface thereof is a concave surface, and the image side surface thereof is a convex surface; and the sixth lens has a positive focal power, and the object side surface thereof is a convex surface. The surface type of the fifth lens and the sixth lens can optimize the field angle of the lens while further increasing the imaging surface of the lens.

[0058] In exemplary embodiments, the total effective focal length f of the optical imaging lens can be in a range from 8.5mm to 9.0mm; the effective focal length f1 of the first lens can be in a range from 7.0mm to 8.0mm; the effective focal length f2 of the second lens can be in a range from -15mm to -11mm; the effective focal length f3 of the third lens can be in a range from 19mm to 39mm; the effective focal length f5 of the fifth lens can be in a range from -20mm to -10mm; and the effective focal length f6 of the sixth lens can be in a range from 7.5mm to 9.5mm.

[0059] In exemplary embodiments, the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens can be in a range from 11mm to 12mm; the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH can be in a range from 8mm to 9mm; and the aperture value Fno of the optical imaging lens can be in a range from 1.6 to 1.7.

[0060] In exemplary embodiments, the optical imaging lens according to the present application further comprises a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application proposes an optical imaging lens with good assembly stability, high yield, less stray light, large aperture, large imaging surface, and high imaging quality. The optical imaging lens according to the above embodiments of the present application can adopt multiple lenses, for example, seven lenses as described above. By reasonably allocating the optical power, surface shape, material, central thickness of each lens, and on-axis spacing between lenses, etc., the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, so that the optical imaging lens is more conducive to production and processing. In the optical imaging lens according to the above embodiments of the present application, the incident light can be converged between the second lens and the third lens, and then diverged through the fourth lens, the fifth lens, the sixth lens, and the seventh lens, and finally transmitted to the imaging surface. According to the optical imaging lens according to the above embodiments of the present application, by controlling the barrel, front spacer element spacing, and rear spacer element thickness, the uniformity of the lens front and rear lens steps can be controlled, the barrel wall thickness can be made uniform, and the assembly stability can be further improved.

[0061] In the embodiments of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, i.e., at least one of the mirror surfaces of the object side surface of the first lens to the image side surface of the seventh lens is an aspherical mirror surface. The aspherical lens is characterized in that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens having a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After the aspherical lens is used, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are aspherical mirror surfaces.

[0062] However, those skilled in the art should understand that the number of lenses constituting the optical imaging lens can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present specification. For example, although seven lenses are described as an example in the embodiments, the optical imaging lens is not limited to including seven lenses. If necessary, the optical imaging lens can also include other numbers of lenses. At least one spacer can be included between any two adjacent lenses.

[0063] The specific embodiments of the optical imaging lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0064] Example 1

[0065] The following refers to Figures 1A to 2C The optical imaging lens according to Embodiment 1 of the present application is described. Figures 1A to 1C The structure schematic diagrams of the lens barrel, the lens group and each spacer element in the optical imaging lens of Embodiment 1 are respectively shown in three implementation manners.

[0066] As Figures 1A to 1C shown, the optical imaging lens sequentially includes, from the object side to the image side: the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7, the filter and the imaging surface S17.

[0067] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The filter has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17.

[0068] Table 1 shows the basic parameters of the optical imaging lens of Example 1, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0069]

[0070] Table 1

[0071] like Figures 1A to 1C As shown, the optical imaging lens may include a lens barrel housing a first to a seventh lens and five spacers located between the first to the sixth lens. The five spacers are a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and a fifth spacer P5.

[0072] Table 2 shows the basic parameters of the lens barrel and each spacer element in three implementations of the optical imaging lens of Example 1.

[0073]

[0074]

[0075] Table 2

[0076] It should be understood that this example only exemplifies the structure and parameters of the lens barrel and each spacer element under three implementation methods, and does not explicitly limit the specific structure and actual parameters of the lens barrel and each spacer element. In actual production, the specific structure and actual parameters of the lens barrel and each spacer element can be set in any suitable manner.

[0077] In the present example, the total effective focal length f of the optical imaging lens is 8.92 mm, the total track length (i.e., the distance on the optical axis from the object side S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens) TTL of the optical imaging lens is 11.72 mm, the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens ImgH is 8.36 mm, and the aperture value Fno of the optical imaging lens is 1.66.

[0078] In the embodiment 1, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface type x of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0079]

[0080] wherein x is the sag of the aspherical surface at a height h along the optical axis, c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above), k is the conic coefficient, and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 3-1 and 3-2 below give the high-order coefficients A4, A6, A8, A10, and A12 that can be used for each aspherical surface S1-S14 in the embodiment 1. 10 12 14 16 18 20 22 24 26 28 30 .

[0081] Face Number A4 A6 A8 A10 A12 A14 A16 S1 2.8564E-04 -6.4597E-05 7.1573E-06 2.1209E-06 -1.9381E-06 4.3338E-07 -5.2346E-08 S2 1.3552E-03 1.3194E-03 -1.0386E-03 4.3078E-04 -1.2047E-04 2.2341E-05 -2.6388E-06 S3 -9.0570E-03 4.4823E-03 -8.4090E-04 -1.1510E-03 1.5269E-03 -1.0270E-03 4.5987E-04 S4 -1.1801E-02 1.4825E-03 6.6938E-03 -1.4771E-02 1.9095E-02 -1.6785E-02 1.0418E-02 S5 -5.6070E-03 1.4712E-03 -1.5190E-03 -3.7219E-04 3.3346E-03 -4.7334E-03 3.7670E-03 S6 -1.9529E-02 9.8251E-03 -9.0300E-03 1.0801E-02 -1.0394E-02 7.2430E-03 -3.6641E-03 S7 -1.6962E-02 3.8698E-03 -1.7599E-03 1.1043E-03 -2.7145E-04 -2.9358E-04 3.3681E-04 S8 -1.5337E-03 -4.5523E-03 4.5157E-03 -4.5614E-03 3.6033E-03 -2.0342E-03 8.1887E-04 S9 1.0301E-02 4.1954E-04 -2.6359E-03 1.8047E-03 -8.0328E-04 2.7618E-04 -7.5382E-05 S10 -5.0101E-02 3.7774E-02 -2.4207E-02 1.2329E-02 -5.0287E-03 1.6214E-03 -4.0599E-04 S11 -6.7547E-02 3.5649E-02 -1.7517E-02 7.0406E-03 -2.2524E-03 5.5621E-04 -1.0440E-04 S12 -2.1751E-02 5.6853E-03 -1.2874E-03 3.0523E-04 -9.8793E-05 2.7791E-05 -5.5203E-06 S13 -1.0000E-02 -3.6988E-03 2.9168E-04 1.0854E-04 -3.0578E-05 3.9079E-06 -3.1047E-07 S14 -3.9304E-06 -9.8973E-03 2.6771E-03 -4.3039E-04 4.8394E-05 -3.9899E-06 2.4430E-07

[0082] Table 3-1

[0083] Face Number A18 A20 A22 A24 A26 A28 A30 S1 2.7759E-09 -5.1213E-11 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 1.7909E-07 -5.3031E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.4533E-04 3.2842E-05 -5.2624E-06 5.8162E-07 -4.1966E-08 1.7692E-09 -3.2839E-11 S4 -4.6334E-03 1.4809E-03 -3.3695E-04 5.3218E-05 -5.5413E-06 3.4183E-07 -9.4576E-09 S5 -1.9578E-03 6.9775E-04 -1.7244E-04 2.9121E-05 -3.2105E-06 2.0838E-07 -6.0406E-09 S6 1.3530E-03 -3.6317E-04 6.9798E-05 -9.3232E-06 8.1921E-07 -4.2445E-08 9.7993E-10 S7 -1.7373E-04 5.5710E-05 -1.1916E-05 1.7115E-06 -1.5924E-07 8.6997E-09 -2.1230E-10 S8 -2.3707E-04 4.9484E-05 -7.3817E-06 7.6758E-07 -5.2843E-08 2.1640E-09 -3.9889E-11 S9 1.6350E-05 -2.7563E-06 3.4590E-07 -3.0518E-08 1.7562E-09 -5.8294E-11 8.3446E-13 S10 7.7678E-05 -1.1164E-05 1.1785E-06 -8.8335E-08 4.4380E-09 -1.3374E-10 1.8242E-12 S11 1.4759E-05 -1.5559E-06 1.2028E-07 -6.6229E-09 2.4608E-10 -5.5349E-12 5.6930E-14 S12 7.6175E-07 -7.3487E-08 4.9366E-09 -2.2587E-10 6.6905E-12 -1.1513E-13 8.6771E-16 S13 1.6737E-08 -6.3257E-10 1.6850E-11 -3.1085E-13 3.7876E-15 -2.7455E-17 8.9728E-20 S14 -1.1101E-08 3.7135E-10 -8.9969E-12 1.5326E-13 -1.7388E-15 1.1786E-17 -3.6093E-20

[0084] Table 3-2

[0085] Figure 2A The on-axis chromatic aberration curve of the optical imaging lens of the embodiment 1 is shown, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 2B The astigmatism curve of the optical imaging lens of the embodiment 1 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 2C The distortion curve of the optical imaging lens of the embodiment 1 is shown, which represents the distortion size values corresponding to different image heights. According to the formula: Figures 2A to 2C It can be seen that the optical imaging lens given in the embodiment 1 can achieve good imaging quality. ​​​​​​​​​​

[0086] Example 2

[0087] The following refers to Figures 3A to 4C An optical imaging lens according to Embodiment 2 is described. In this and the following embodiments, for brevity, some descriptions similar to Embodiment 1 will be omitted. Figures 3A to 3C Structure diagrams of the lens barrel, the lens groups and the spacer elements in the optical imaging lens of Embodiment 2 are shown respectively in three implementations.

[0088] As Figures 3A to 3C shown, the optical imaging lens comprises, in order from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter and an imaging surface S17.

[0089] The first lens E1 has positive refractive power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has positive refractive power, the object side surface S5 is concave, and the image side surface S6 is convex. The fourth lens E4 has negative refractive power, the object side surface S7 is convex, and the image side surface S8 is concave. The fifth lens E5 has negative refractive power, the object side surface S9 is concave, and the image side surface S10 is convex. The sixth lens E6 has positive refractive power, the object side surface S11 is convex, and the image side surface S12 is convex. The seventh lens E7 has negative refractive power, the object side surface S13 is convex, and the image side surface S14 is concave. The filter has an object side surface S15 and an image side surface S16. Light from the object passes through the surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

[0090] As Figures 3A to 3C shown, the optical imaging lens can comprise a lens barrel accommodating the first to seventh lenses and five spacer elements respectively located between the first to sixth lenses. The five spacer elements are respectively 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] It should be understood that, in this example, the structures and parameters of the lens barrel and the spacer elements in the three implementations are only exemplarily listed, and the specific structures and actual parameters of the lens barrel and the spacer elements are not explicitly limited. In actual production, the specific structures and actual parameters of the lens barrel and the spacer elements can be set by any suitable manner.

[0092] In the present example, the total effective focal length f of the optical imaging lens is 8.89 mm, the total track length TTL of the optical imaging lens is 11.56 mm, the half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging lens is 8.36 mm, and the aperture value Fno of the optical imaging lens is 1.66.

[0093] Table 4 shows the basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, the thickness / distance and the focal length are all millimeters (mm). Table 5 shows the basic parameter table of the lens barrel and each spacer element in three implementation manners of the optical imaging lens of Example 2. Tables 6-1 and 6-2 show the high-order term coefficients of the aspherical surfaces that can be used in Example 2, wherein each aspherical surface type can be defined by the formula (1) given in Example 1 above.

[0094]

[0095] Table 4

[0096]

[0097]

[0098] Table 5

[0099] Face Number A4 A6 A8 A10 A12 A14 A16 S1 -2.4770E-06 9.8067E-06 -3.6383E-05 2.2216E-05 -8.3465E-06 1.8988E-06 -2.7322E-07 S2 3.6611E-04 1.3699E-03 -7.8352E-04 2.5361E-04 -5.2590E-05 6.4786E-06 -4.4037E-07 S3 -8.4003E-03 3.7020E-03 -2.0691E-04 -1.6084E-03 1.7844E-03 -1.1230E-03 4.7455E-04 S4 -8.8137E-03 -3.3201E-05 7.6168E-03 -1.4716E-02 1.7434E-02 -1.4199E-02 8.2291E-03 S5 -2.9187E-03 1.5115E-04 -5.6968E-04 -3.2874E-06 7.4436E-04 -8.8946E-04 5.3990E-04 S6 -1.0850E-02 -6.5182E-03 1.7964E-02 -2.1983E-02 1.7388E-02 -9.4867E-03 3.6488E-03 S7 -1.5618E-02 -3.1469E-03 2.8820E-03 1.6692E-03 -5.1988E-03 5.1237E-03 -3.0128E-03 S8 -6.4963E-03 -2.6586E-03 -2.3396E-04 2.1370E-03 -2.0842E-03 1.1854E-03 -4.5507E-04 S9 -1.4782E-03 3.1510E-03 -4.2218E-03 3.4897E-03 -1.9624E-03 7.9264E-04 -2.3368E-04 S10 -1.8877E-02 4.0366E-03 -1.0109E-04 -1.3055E-03 1.0875E-03 -4.9478E-04 1.4837E-04 S11 -1.6774E-02 1.8610E-03 1.0477E-03 -1.4322E-03 7.6173E-04 -2.5323E-04 5.8009E-05 S12 -1.4138E-03 -1.1273E-03 1.4669E-03 -1.0269E-03 4.0908E-04 -1.0765E-04 1.9823E-05 S13 -3.0037E-02 2.5956E-03 -5.3140E-05 -2.8140E-05 5.6417E-06 -5.9168E-07 4.0413E-08 S14 -3.3934E-02 4.5577E-03 -5.0926E-04 4.3754E-05 -2.8380E-06 1.3955E-07 -5.2282E-09

[0100] Table 6-1

[0101]

[0102]

[0103] Table 6-2

[0104] Figure 4A The on-axis chromatic aberration curve of the optical imaging lens of Example 2 is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the lens. Figure 4B The astigmatism curve of the optical imaging lens of Example 2 is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 4C The distortion curve of the optical imaging lens of Example 2 is shown, which represents the distortion size values corresponding to different image heights. According to the distortion curve, the distortion of the optical imaging lens of Example 2 is less than 0.5% at the image height of 8.36 mm. Figures 4A to 4C It can be seen that the optical imaging lens given in Example 2 can achieve good imaging quality.

[0105] Example 3

[0106] The following refers to Figures 5A to 6C The optical imaging lens according to Example 3 of the present application is described. Figures 5A to 5CStructural schematic diagrams of the lens barrel, the lens group and the interval elements in three implementation manners of the optical imaging lens of embodiment 3 are shown respectively.

[0107] As shown in Figures 5A to 5C the optical imaging lens sequentially comprises, from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter and an imaging surface S17.

[0108] The first lens E1 has positive refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has positive refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface. The fourth lens E4 has positive refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a concave surface. The fifth lens E5 has negative refractive power, the object side surface S9 is a concave surface, and the image side surface S10 is a convex surface. The sixth lens E6 has positive refractive power, the object side surface S11 is a convex surface, and the image side surface S12 is a convex surface. The seventh lens E7 has negative refractive power, the object side surface S13 is a convex surface, and the image side surface S14 is a concave surface. The filter has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0109] As shown in Figures 5A to 5C the optical imaging lens can comprise a lens barrel accommodating the first lens to the seventh lens and five interval elements respectively located between the first lens to the sixth lens. The five interval elements are respectively a first interval element P1, a second interval element P2, a third interval element P3, a fourth interval element P4 and a fifth interval element P5.

[0110] It should be understood that, in the present example, the structures and parameters of the lens barrel and the interval elements in three implementation manners are only exemplarily listed, and the specific structures and actual parameters of the lens barrel and the interval elements are not explicitly limited. The specific structures and actual parameters of the lens barrel and the interval elements can be set by any suitable manner in actual production.

[0111] In the present example, the total effective focal length f of the optical imaging lens is 8.95 mm, the total length TTL of the optical imaging lens is 11.60 mm, the half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging lens is ImgH 8.36 mm, and the aperture value Fno of the optical imaging lens is 1.66.

[0112] Table 7 shows the basic parameters of the optical imaging lens of Example 3, wherein the units of the radius of curvature, the thickness / distance and the focal length are all millimeters (mm). Table 8 shows the basic parameters of the lens barrel and the interval elements of the three implementations of the optical imaging lens of Example 3. Tables 9-1 and 9-2 show the high-order term coefficients of the aspherical surfaces that can be used in the optical imaging lens of Example 3, wherein each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0113]

[0114] Table 7

[0115]

[0116]

[0117] Table 8

[0118]

[0119]

[0120] Table 9-1

[0121] Face Number A18 A20 A22 A24 A26 A28 A30 S1 -3.9854E-09 1.0158E-10 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 2.5593E-07 -6.9271E-09 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 -1.2308E-04 2.0278E-05 -1.9648E-06 6.0444E-08 8.6191E-09 -1.0179E-09 3.4088E-11 S4 7.1882E-04 -2.6538E-04 6.4891E-05 -1.0568E-05 1.1051E-06 -6.7254E-08 1.8128E-09 S5 2.6143E-03 -7.2303E-04 1.4424E-04 -2.0228E-05 1.8932E-06 -1.0625E-07 2.7062E-09 S6 7.2080E-03 -1.6229E-03 2.6828E-04 -3.1561E-05 2.4976E-06 -1.1903E-07 2.5789E-09 S7 3.9578E-03 -8.3182E-04 1.2829E-04 -1.4079E-05 1.0397E-06 -4.6269E-08 9.3678E-10 S8 -1.2770E-04 2.3824E-05 -3.1456E-06 2.8764E-07 -1.7330E-08 6.1861E-10 -9.9017E-12 S9 5.6445E-05 -9.0169E-06 1.0497E-06 -8.6247E-08 4.7287E-09 -1.5500E-10 2.2948E-12 S10 9.7557E-06 -1.2567E-06 1.2591E-07 -9.3856E-09 4.8527E-10 -1.5396E-11 2.2410E-13 S11 6.2909E-06 -7.6887E-07 6.8244E-08 -4.2699E-09 1.7865E-10 -4.4891E-12 5.1209E-14 S12 1.2313E-06 -1.4532E-07 1.1784E-08 -6.4559E-10 2.2822E-11 -4.6979E-13 4.2760E-15 S13 2.1749E-10 -2.2344E-11 8.9977E-13 -2.1108E-14 3.0044E-16 -2.4170E-18 8.4691E-21 S14 1.6682E-10 -4.2337E-12 8.2940E-14 -1.2048E-15 1.2115E-17 -7.4582E-20 2.1007E-22

[0122] Table 9-2

[0123] Figure 6A The on-axis chromatic aberration curve of the optical imaging lens of Example 3 is shown, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the lens. Figure 6B The astigmatism curve of the optical imaging lens of Example 3 is shown, which represents the meridional image curvature and sagittal image curvature. Figure 6C The distortion curve of the optical imaging lens of Example 3 is shown, which represents the distortion size values corresponding to different image heights. According to the formula (2) given in Example 1 above, the distortion size values of the optical imaging lens of Example 3 are calculated. Figures 6A to 6C It can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality.

[0124] In summary, Examples 1 to 3 respectively satisfy the relationships shown in Tables 10-1, 10-2 and 10-3.

[0125]

[0126]

[0127] Table 10-1

[0128]

[0129] Table 10-2

[0130]

[0131]

[0132] Table 10-3

[0133] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor device (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens described above.

[0134] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. It should be understood by those skilled in the art that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combinations of the technical features described above or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above-described features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging lens comprising a lens barrel and a lens assembly assembled in the lens barrel, the lens assembly comprising, in order from an object side to an image side along an optical axis, a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, characterized in that, the first lens has a positive refractive power, an object side surface of which is convex and an image side surface of which is concave; the second lens has a negative refractive power, an object side surface of which is convex and an image side surface of which is concave; the third lens has a positive refractive power, an object side surface of which is concave and an image side surface of which is convex; an object side surface of the fourth lens is convex and an image side surface of which is concave; the fifth lens has a negative refractive power, an object side surface of which is concave and an image side surface of which is convex; the sixth lens has a positive refractive power, an object side surface of which is convex; an object side surface of the seventh lens is convex and an image side surface of which is concave; at least one of the fourth lens and the seventh lens has a negative refractive power; and a number of lenses having refractive power in the optical imaging lens is seven; the optical imaging lens further comprises: a first spacer element located between the first lens and the second lens; a second spacer element located between the second lens and the third lens; a fourth spacer element located between the fourth lens and the fifth lens; and a fifth spacer element located between the fifth lens and the sixth lens; the optical imaging lens satisfies 2.85≤f1×(d1m+D2m) / (R3×R4)≤3.35 and 1.67≤(R7+CT4-D0m) / (EP45-CP4-CP5)≤21.43, wherein f1 is an effective focal length of the first lens, R3 is a radius of curvature of an object side surface of the second lens, R4 is a radius of curvature of an image side surface of the second lens, d1m is an inner diameter of an image side surface of the first spacer element, D2m is an outer diameter of an image side surface of the second spacer element; R7 is a radius of curvature of an object side surface of the fourth lens, CT4 is a center thickness of the fourth lens, D0m is an outer diameter of an image side end of the lens barrel, CP4 is a maximum thickness of the fourth spacer element, and CP5 is a maximum thickness of the fifth spacer element. the optical imaging lens satisfies 152.79≤R2×(d1s+D1s) / (R1×CP1)≤228.15, wherein R2 is a radius of curvature of an image side surface of the first lens, R1 is a radius of curvature of an object side surface of the first lens, D1s is an outer diameter of an object side surface of the first spacer element, d1s is an inner diameter of an object side surface of the first spacer element, and CP1 is a maximum thickness of the first spacer element. 2.The optical imaging lens according to claim 1, wherein, ​ 3.The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 21.53≤(f3×d2s×D2s) / (EP45×d2m×D2m)≤49.18, wherein f3 is an effective focal length of the third lens, d2s is an inner diameter of an object side surface of the second spacer element, D2s is an outer diameter of the object side surface of the second spacer element, EP45 is a distance apart between an image side surface of the fourth spacer element and an object side surface of the fifth spacer element in a direction parallel to the optical axis, and d2m is an inner diameter of an image side surface of the second spacer element.

4. The optical imaging lens according to claim 3, characterized in that, The optical imaging lens further comprises a third spacer element located between the third lens and the fourth lens, The optical imaging lens satisfies: 14.98≤(d3s / EP23+T23 / CT3)×(L / D1m)≤21.38, wherein d3s is an inner diameter of an object side surface of the third spacer element, EP23 is a distance apart between an image side surface of the second spacer element and an object side surface of the third spacer element in a direction parallel to the optical axis, T23 is an air separation of the second lens and the third lens on the optical axis, CT3 is a center thickness of the third lens, L is a maximum height of the lens barrel, and D1m is an outer diameter of an image side surface of the first spacer element.

5. The optical imaging lens according to claim 3, characterized in that, The optical imaging lens satisfies: 10.17≤(R13+R14+d4m+d5m) / (d5s-d4s)≤32.61, wherein R13 is a curvature radius of an object side surface of the seventh lens, R14 is a curvature radius of an image side surface of the seventh lens, d4m is an inner diameter of an image side surface of the fourth spacer element, d5m is an inner diameter of an image side surface of the fifth spacer element, d4s is an inner diameter of an object side surface of the fourth spacer element, and d5s is an inner diameter of an object side surface of the fifth spacer element. 6.The optical imaging lens according to claim 1, wherein, The optical imaging lens satisfies: 16.23≤(T67+f×tan(FOV / 2)) / (EP01-EP12)≤24.44, wherein T67 is an air separation of the sixth lens and the seventh lens on the optical axis, f is a total effective focal length of the optical imaging lens, FOV is a maximum field of view angle of the optical imaging lens, EP01 is a distance apart between an object side end of the lens barrel and an object side surface of the first spacer element in a direction parallel to the optical axis, and EP12 is a distance apart between an image side surface of the first spacer element and an object side surface of the second spacer element in a direction parallel to the optical axis. 7.The optical imaging lens according to claim 4, wherein, The optical imaging lens satisfies: 23.86≤d3m / (D5s-D4s-T12-T34)≤46.91, wherein T12 is an air separation of the first lens and the second lens on the optical axis, T34 is an air separation of the third lens and the fourth lens on the optical axis, d3m is an inner diameter of an image side surface of the third spacer element, D4s is an outer diameter of an object side surface of the fourth spacer element, and D5s is an outer diameter of an object side surface of the fifth spacer element. 8.The optical imaging lens according to claim 4, wherein, The optical imaging lens satisfies: 26.81≤(L / EP34) / (f / EPD-D4m / D3m)≤32.88, wherein EP34 is a spacing distance of an image side surface of the third spacer element to an object side surface of the fourth spacer element in a direction parallel to the optical axis, f is a total effective focal length of the optical imaging lens, EPD is an entrance pupil diameter of the optical imaging lens, D4m is an outer diameter of the image side surface of the fourth spacer element, and D3m is an outer diameter of the image side surface of the third spacer element. 9.The optical imaging lens according to claim 4, wherein, The optical imaging lens satisfies: 20.30≤(f6+R11) / (CP2+EP23+CP3)≤25.30, wherein f6 is an effective focal length of the sixth lens, R11 is a curvature radius of the object side surface of the sixth lens, CP2 is a maximum thickness of the second spacer element, and CP3 is a maximum thickness of the third spacer element. 10.The optical imaging lens according to claim 4, wherein, The optical imaging lens satisfies: 80.45≤(R8 / f+d0m / d0s)×(D3s / CP1)≤102.81, wherein R8 is a curvature radius of the image side surface of the fourth lens, f is a total effective focal length of the optical imaging lens, d0m is an inner diameter of the image side end of the lens barrel, d0s is an inner diameter of the object side end of the lens barrel, D3s is an outer diameter of the object side surface of the third spacer element, and CP1 is a maximum thickness of the first spacer element.

11. The optical imaging lens according to any of claims 1-10, wherein, There are at least 4 spacer elements between the fourth lens and the seventh lens.

Images