CN219625796U - Image pickup lens - Google Patents

Image pickup lens Download PDF

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Publication number
CN219625796U
CN219625796U CN202320843515.2U CN202320843515U CN219625796U CN 219625796 U CN219625796 U CN 219625796U CN 202320843515 U CN202320843515 U CN 202320843515U CN 219625796 U CN219625796 U CN 219625796U
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lens
light shielding
shielding element
image side
imaging
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CN202320843515.2U
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Inventor
刘浩鹏
程一夫
姚泽杰
方荣波
闻人建科
戴付建
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Abstract

The application discloses an imaging lens, which comprises a lens barrel, a lens group and a plurality of shading elements, wherein the lens group comprises a first lens to an eighth lens which are orderly arranged from an object side to an image side along an optical axis, and the eighth lens is a compound lens with one side being a plane; the plurality of shading elements comprise first shading elements to sixth shading elements which are sequentially arranged between every two adjacent lenses in the first lens to the seventh lens, and each shading element is respectively contacted with the adjacent lenses on the object side; and, the maximum length L of the lens barrel in the optical axis direction, the distance T78 of the image side surface of the seventh lens to the object side surface of the eighth lens in the optical axis direction, and the center thickness CT8 of the eighth lens on the optical axis satisfy the conditional expression 2<L/(t78+ct 8) <6.

Description

Image pickup lens
Technical Field
The present application relates to the field of optical elements, and more particularly, to an imaging lens.
Background
Along with the continuous upgrading and development of consumer electronic products such as mobile phones, the shooting requirements of people on the electronic products are continuously improved, and meanwhile, the industry also puts forward higher and higher requirements on shooting lenses. It is known that a larger sensor is more beneficial to obtain high-quality imaging results because the sensor can effectively improve the photosensitivity and reduce the noise of images, and can clearly show the details of high-light and dark areas of images in a high dynamic range. So in order to obtain better imaging quality, handset manufacturers are also continuously increasing the "bottom" size, i.e. the size of the photosensitive chip as imaging medium. However, the use of a large-sized sensor also causes problems such as an increase in the volume and weight of the lens.
Taking an eight-lens-type lens as an example, in order to accommodate a sensor with a larger size, the volume of the lens is multiplied, the design requirements of miniaturization and thinness are difficult to meet, and the eighth lens included in the lens module end often has the problems of poor process formability, unsecured yield and the like, and meanwhile, the seventh lens, the eighth lens, the lens barrel and the lens barrel are poor in combined stability and the like, so that the imaging quality and the yield of the lens are difficult to improve.
Therefore, according to the situation, the manufacturability and yield of the eighth lens can be effectively improved through the optimization design, the size of the lens can be shortened, miniaturization is realized, meanwhile, the stability of the module end can be improved, and further the quality and yield of the lens are effectively improved, so that the eighth lens is one of the technical problems to be solved in the present urgent need of the person skilled in the art.
Disclosure of Invention
The utility model provides an imaging lens which can comprise a lens barrel, a lens group and a plurality of shading elements, wherein the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object side to an image side along an optical axis, and the eighth lens is a compound lens with one side being a plane; the plurality of shading elements includes: the image forming device includes a first light shielding element located between the first lens and the second lens and in contact with an image side portion of the first lens, a second light shielding element located between the second lens and the third lens and in contact with an image side portion of the second lens, a third light shielding element located between the third lens and the fourth lens and in contact with an image side portion of the third lens, a fourth light shielding element located between the fourth lens and the fifth lens and in contact with an image side portion of the fourth lens, a fifth light shielding element located between the fifth lens and the sixth lens and in contact with an image side portion of the fifth lens, and a sixth light shielding element located between the sixth lens and the seventh lens and in contact with an image side portion of the sixth lens. The maximum length L of the lens barrel along the optical axis direction, the distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens along the optical axis, and the center thickness CT8 of the eighth lens on the optical axis may satisfy: 2<L/(T78+CT8) <6.
In one embodiment, a center thickness CT6 of the sixth lens on the optical axis, a distance EP56 from an image side surface of the fifth light shielding element to an object side surface of the sixth light shielding element along the optical axis, and a refractive index N6 of the sixth lens may satisfy: 0< CT6/EP56 XN 6<3.
In one embodiment, the sum Σct of the center thicknesses of each of the first to eighth lenses on the optical axis and the sum Σcp of the thicknesses of each of the first to sixth light shielding elements along the optical axis direction may satisfy: 5< ΣCT/ΣCPs <40.
In one embodiment, a distance from an object side end surface of the lens barrel to an object side surface of the first light shielding element along the optical axis and a sum Σep of pitches of each adjacent two light shielding elements of the first light shielding element to the sixth light shielding element along the optical axis, a sum Σcp of thicknesses of each light shielding element of the first light shielding element to the sixth light shielding element along the optical axis direction, and an aperture value fno of the imaging lens may satisfy: 0< ΣEP/ΣCP/fno <20.
In one embodiment, the radius of curvature R8 of the image side of the fourth lens element, the minimum inner diameter d4s of the object side of the fourth light-shielding element, the radius of curvature R9 of the object side of the fifth lens element and the minimum inner diameter d4m of the image side of the fourth light-shielding element may satisfy: -10< R8/d4s+R9/d4m <5.
In one embodiment, the effective focal length f5 of the fifth lens, the maximum outer diameter D4m of the image side surface of the fourth light shielding element, and the minimum inner diameter D4m of the image side surface of the fourth light shielding element may satisfy: -20< f 5/(D4 m-D4 m) <10.
In one embodiment, the effective focal length f1 of the first lens, the minimum inner diameter d1s of the object side surface of the first light shielding element, the effective focal length f2 of the second lens, and the minimum inner diameter d2s of the object side surface of the second light shielding element may satisfy: 0< f1/d1s-f2/d2s <10.
In one embodiment, the effective focal length f of the imaging lens, the maximum outer diameter D0s of the object side end surface of the lens barrel, and the minimum inner diameter D0s of the object side end surface of the lens barrel may satisfy: 0<f/(D0 s-D0 s) <10.
In one embodiment, the effective focal length f of the imaging lens, the distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens along the optical axis, and the maximum length L of the lens barrel along the optical axis direction may satisfy: 2<f/(TTL-L) <8.
In one embodiment, the minimum inner diameter d5m of the image side surface of the fifth light shielding element, the radius of curvature R11 of the object side surface of the sixth lens element, the minimum inner diameter d5s of the object side surface of the fifth light shielding element, and the radius of curvature R10 of the image side surface of the fifth lens element may satisfy: -2< dl m/R11+d5s/R10<5.
In one embodiment, the plurality of light shielding elements may further include a fourth auxiliary light shielding element located at an image side of the fourth light shielding element and in contact with an image side portion of the fourth light shielding element.
In one embodiment, the plurality of light shielding elements may further include a fifth auxiliary light shielding element located at an image side of the fifth light shielding element and in contact with an image side portion of the fifth light shielding element.
In one embodiment, the plurality of light shielding elements may further include a sixth auxiliary light shielding element located at an image side of the sixth light shielding element and in contact with an image side portion of the sixth light shielding element.
In one embodiment, the eighth lens comprises a material having an infrared cut-off filtering function, so that the eighth lens has the infrared cut-off filtering function.
In one embodiment, the image side surface of the eighth lens has an infrared cut-off layer, so that the eighth lens has an infrared cut-off filtering function.
In one embodiment, the eighth lens is a compound lens including an aspherical lens portion and a glass substrate portion.
In one embodiment, the material of the aspheric lens portion is a force deformable material.
In one embodiment, the material of the aspheric lens part is plastic or glue.
In one embodiment, the shape of the aspherical lens part is formed by adhering a material of the aspherical lens part to the glass substrate part and then embossing the same.
The application provides an imaging lens which comprises a lens barrel, eight imaging lens groups and a plurality of shading elements, wherein the first to eighth lenses are sequentially arranged from an object side to an image side along an optical axis, and the eighth lens is a compound lens with one side being a plane; the plurality of shading elements comprise first to sixth shading elements which are sequentially arranged between every two adjacent lenses in the first to seventh lenses, and each shading element is respectively contacted with the adjacent lenses on the object side; meanwhile, the maximum length L of the lens barrel in the optical axis direction, the distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens in the optical axis direction, and the center thickness CT8 of the eighth lens on the optical axis are controlled to satisfy the condition 2<L/(t78+ct 8) <6. By the arrangement of the imaging lens, the thickness of the eighth lens can be reasonably controlled, the process molding of the eighth lens is facilitated, and the yield of the eighth lens can be improved; and the certainty of the arrangement form of the seventh lens and the eighth lens in the lens barrel can be ensured, thereby being beneficial to improving the fixing stability of the lens module end and improving the yield of the lens.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a schematic view showing a structure and a part of parameters of an imaging lens according to an exemplary embodiment of the present application;
fig. 2 to 4 are schematic views showing the structure of an imaging lens according to embodiment 1 of the present application in three embodiments, respectively;
fig. 5 to 8 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens of embodiment 1;
fig. 9 to 11 are schematic views showing the structure of an imaging lens according to embodiment 2 of the present application in three embodiments, respectively;
fig. 12 to 15 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens of embodiment 2;
fig. 16 to 18 are schematic views showing the structure of an imaging lens according to embodiment 3 of the present application in three embodiments, respectively;
fig. 19 to 22 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens of embodiment 3;
fig. 23 to 25 are schematic views showing the structure of an imaging lens according to embodiment 4 of the present application in three embodiments, respectively; and
Fig. 26 to 29 show an on-axis chromatic aberration curve, a magnification chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the imaging lens of embodiment 4.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present 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 feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be performed according to a method commonly used in the art, for example, by determining the roughness in positive and negative of an R value (R means the radius of curvature of the paraxial region). The surface of each lens closest to the subject is referred to herein as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens. In the object side surface, when the R value is positive, the object side surface is judged to be convex, and when the R value is negative, the object side surface is judged to be concave; in the image side, the concave surface is determined when the R value is positive, and the convex surface is determined when the R value is negative.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
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.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
An imaging lens according to an exemplary embodiment of the present application may include a barrel, a lens group, and a plurality of light shielding elements. The lens group may be an eight-lens group including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, which are sequentially arranged from an object side to an image side along the optical axis, wherein the eighth lens may be a compound lens with one side being a plane, and one of an object side and an image side may be a plane.
In an exemplary embodiment, the plurality of light shielding elements may include: a first light shielding element located between the first lens and the second lens and in contact with an image side surface portion of the first lens; a second light shielding element located between the second lens and the third lens and in contact with an image side surface portion of the second lens; a third light shielding element located between the third lens and the fourth lens and in contact with an image side surface portion of the third lens; a fourth light shielding element located between the fourth lens and the fifth lens and in contact with an image side surface portion of the fourth lens; a fifth light shielding element located between the fifth lens and the sixth lens and in contact with an image side surface portion of the fifth lens; and a sixth light shielding element located between the sixth lens and the seventh lens and in contact with an image side surface portion of the sixth lens.
In an exemplary embodiment, at least part of the lenses of the lens group and the plurality of light shielding members may be assembled within the lens barrel. For example, the first to seventh lenses and the first to sixth light shielding members may be assembled in the lens barrel.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 2<L/(t78+ct 8) <6, where L is the maximum length of the lens barrel in the optical axis direction, i.e., the distance along the optical axis from the object-side end surface (surface closest to the object side) of the lens barrel to the image-side end surface (surface closest to the image side) of the lens barrel, T78 is the distance along the optical axis from the image side surface of the seventh lens to the object side surface of the eighth lens, and CT8 is the center thickness of the eighth lens on the optical axis. The thickness of the eighth lens can be reasonably controlled by controlling the ratio of the maximum length of the lens barrel along the optical axis direction to the sum of the distance from the image side surface of the seventh lens to the object side surface of the eighth lens along the optical axis and the thickness of the center of the eighth lens on the optical axis in the range, thereby being beneficial to the process forming of the eighth lens and improving the yield of the eighth lens; and the fixing forms of the seventh lens and the eighth lens in the lens barrel can be confirmed, so that the fixing stability can be improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 0< ct6/EP56×n6<3, where CT6 is a center thickness of the sixth lens element on the optical axis, EP56 is a distance from an image side surface of the fifth light shielding element to an object side surface of the sixth light shielding element along the optical axis, and N6 is a refractive index of the sixth lens element. The center thickness of the sixth lens on the optical axis, the distance from the image side surface of the fifth light shielding element to the object side surface of the sixth light shielding element along the optical axis and the refractive index of the sixth lens meet the condition 0< CT6/EP56 multiplied by N6<3, so that the center thickness of the sixth lens is reasonably controlled, the uniformity of the thickness of the sixth lens is ensured, the forming of the lens is facilitated, and the forming yield of the lens is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 5< Σct/Σcp <40, where Σct is a sum of thicknesses of centers of each lens element in the first lens element to the eighth lens element on the optical axis, Σcp is a sum of thicknesses of each light-shielding element in the first light-shielding element to the sixth light-shielding element in the optical axis direction. The ratio of the sum of the central thicknesses of the lenses of the first lens to the eighth lens on the optical axis to the sum of the thicknesses of the light shielding elements of the first light shielding element to the sixth light shielding element along the optical axis is controlled within the range, so that the total thickness of the lenses is controlled, the length of the lens barrel is controlled, the length of the lens is reduced, the volume of the lens is reduced, and the miniaturization of the module is realized.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 0< Σep/Σcp/fno <20, where Σep is a sum of a distance from an object side end surface of the lens barrel to an object side surface of the first light shielding element along the optical axis and a distance between each adjacent two light shielding elements of the first light shielding element to the sixth light shielding element along the optical axis, that is, a sum of EP01, EP12, EP23, EP34, EP45, and EP56, Σcp is a sum of thicknesses of each light shielding element of the first light shielding element to the sixth light shielding element along the optical axis, and fno is an aperture value of the imaging lens. The total length of the lens can be compressed by controlling the distance from the object side end surface of the lens barrel to the object side surface of the first light shielding element along the optical axis and the sum of the distances between every two adjacent light shielding elements from the first light shielding element to the sixth light shielding element along the optical axis, the sum of the thicknesses of every light shielding element from the first light shielding element to the sixth light shielding element along the optical axis direction and the aperture value of the imaging lens to meet the condition 0< ΣEP/ΣCP/fno <20, so that the thinning of the lens is facilitated; meanwhile, the aperture of the lens is controlled, enough light entering quantity is ensured, imaging quality of the lens is improved, and the relative illumination of the lens is improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression-10 < R8/d4s+r9/d4m <5, where R8 is a radius of curvature of an image side surface of the fourth lens element, d4s is a minimum inner diameter of an object side surface of the fourth light shielding element, R9 is a radius of curvature of an object side surface of the fifth lens element, and d4m is a minimum inner diameter of an image side surface of the fourth light shielding element. The deflection trend of light rays can be effectively controlled by controlling the ratio of the curvature radius of the image side surface of the fourth lens to the minimum inner diameter of the object side surface of the fourth shading element and the sum of the ratio of the curvature radius of the object side surface of the fifth lens to the minimum inner diameter of the image side surface of the fourth shading element in the range, the excessive light rays of an external view field can be intercepted, the imaging quality of the lens can be improved, the stray light risk of the lens can be effectively controlled, the shapes of the fourth lens and the fifth lens can be reasonably controlled, and the process forming of the fourth lens and the fifth lens is facilitated.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression-20 < f 5/(D4 m-D4 m) <10, where f5 is the effective focal length of the fifth lens, D4m is the maximum outer diameter of the image side surface of the fourth light shielding element, and D4m is the minimum inner diameter of the image side surface of the fourth light shielding element. The ratio of the effective focal length of the fifth lens to the difference between the maximum outer diameter of the image side surface of the fourth light shielding element and the minimum inner diameter of the image side surface of the fourth light shielding element is controlled within the range, so that the processing feasibility of the fourth light shielding element can be effectively ensured, the fourth light shielding element can shield redundant light, stray light generated by the third lens is improved, and the imaging quality is improved; meanwhile, the focal length of the fifth lens can be prevented from being too small, the focal length of the fifth lens is reasonably controlled, miniaturization of an optical system is guaranteed, and light and thin lenses are facilitated.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 0< f1/d1s-f2/d2s <10, where f1 is an effective focal length of the first lens, d1s is a minimum inner diameter of an object side surface of the first light shielding element, f2 is an effective focal length of the second lens, and d2s is a minimum inner diameter of an object side surface of the second light shielding element. The difference between the effective focal length of the first lens and the minimum inner diameter of the object side surface of the first shading element and the difference between the effective focal length of the second lens and the minimum inner diameter of the object side surface of the second shading element are controlled within the range, so that the light quantity of the lens can be effectively controlled, redundant light can be blocked, stray light generated by the second lens is improved, the quality of the lens is improved, the focal lengths of the first lens and the second lens can be effectively controlled, the focal lengths of the first lens and the second lens are not too short, and the lens can have a larger field angle.
In an exemplary embodiment, the imaging lens of the present application may satisfy the conditional expression 0<f/(D0 s-D0 s) <10, where f is an effective focal length of the imaging lens, D0s is a maximum outer diameter of an object-side end surface of the lens barrel, and D0s is a minimum inner diameter of the object-side end surface of the lens barrel. By controlling the ratio of the effective focal length of the imaging lens to the difference between the maximum outer diameter of the object side end surface of the lens barrel and the minimum inner diameter of the object side end surface of the lens barrel within the range, the thickness of the lens barrel can be effectively controlled, the process forming of the lens barrel is facilitated, the object side end part of the lens barrel has a reasonable thickness, the assembly stability of the rear lens is facilitated, and the assembly yield of the lens is facilitated to be improved.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition 2<f/(TTL-L) <8, where f is an effective focal length of the imaging lens, TTL is a distance from an object side surface of the first lens to an imaging surface of the imaging lens along an optical axis, and L is a maximum length of the lens barrel in the optical axis direction. The ratio of the effective focal length of the imaging lens to the difference between the distance from the object side surface of the first lens to the imaging surface of the imaging lens along the optical axis and the maximum length of the lens barrel along the optical axis direction is controlled within the range, so that the total optical length of the lens and the maximum length of the lens barrel can be effectively controlled, the light and thin of the lens can be realized, more modules can be flexibly adapted, the lens has stronger popularization, the miniaturization of the modules is facilitated, and the light-weight design can be realized.
In an exemplary embodiment, the imaging lens of the present application may satisfy the condition of-2 < dm m/r11+d5s/r10<5, where d5m is the minimum inner diameter of the image side surface of the fifth light shielding element, R11 is the radius of curvature of the object side surface of the sixth lens element, d5s is the minimum inner diameter of the object side surface of the fifth light shielding element, and R10 is the radius of curvature of the image side surface of the fifth lens element. The ratio of the minimum inner diameter of the image side surface of the fifth shading element to the curvature radius of the object side surface of the sixth lens and the sum of the ratio of the minimum inner diameter of the object side surface of the fifth shading element to the curvature radius of the image side surface of the fifth lens are controlled within the range, so that the effective diameter shapes of the fifth lens and the sixth lens can be effectively controlled, the forming of the lenses is facilitated, the forming yield of the lenses is improved, the deflection trend of light rays can be controlled, stray light of the lenses can be effectively improved, and the imaging quality of the lenses is guaranteed.
In an exemplary embodiment, the plurality of light shielding elements may further include a fourth auxiliary light shielding element located at an image side of the fourth light shielding element and contacting or bearing against an image side portion of the fourth light shielding element. The arrangement of the fourth auxiliary shading element can realize large-level-difference transition of the fourth lens and the fifth lens, realize stable bearing of the structure and improve the assembly stability of the lens.
In an exemplary embodiment, the plurality of light shielding elements may further include a fifth auxiliary light shielding element located at an image side of the fifth light shielding element and contacting or bearing against an image side portion of the fifth light shielding element. The arrangement of the fifth auxiliary shading element can realize large-level-difference transition of the fifth lens and the sixth lens, realize stable bearing of the structure and improve the assembly stability of the lens.
In an exemplary embodiment, the plurality of light shielding elements may further include a sixth auxiliary light shielding element located at an image side of the sixth light shielding element and contacting or bearing against an image side portion of the sixth light shielding element. The arrangement of the sixth auxiliary shading element can realize large-level-difference transition of the sixth lens and the seventh lens, realize stable bearing of the structure and improve the assembly stability of the lens.
In an exemplary embodiment, the eighth lens may include a material having an infrared cut-off filtering function so as to have an infrared cut-off filtering function. In other words, the eighth lens may have the function of an infrared cut filter due to the material of its lens. Illustratively, the eighth lens may be a composite lens formed by gluing a material such as glue and an infrared filter, which still has an infrared filter function, and has a transmittance of 50% in a wavelength range from 380nm to 430nm, a transmittance of 80% or more in a wavelength range from 500nm to 600nm, and a transmittance of 10% or less in a wavelength range from 730nm to 800 nm. The visible light can be sent into the ISP for image post-processing, and the infrared light can not participate in the calculation of the ISP due to the function of infrared cut-off filtering, so that the calculation result is not influenced.
In an exemplary embodiment, the image side surface of the eighth lens may have an infrared cut layer so that the eighth lens has an infrared cut filtering function. Generally, infrared light beyond 700nm needs to be filtered out in a lens of the mobile phone, so that better imaging quality is obtained, and an infrared cut-off layer is arranged on the image side surface of the eighth lens, so that the eighth lens has a function of being used as an infrared cut-off filter, light participating in imaging can be ensured to be visible light, and color cast of an image is prevented.
In an exemplary embodiment, the eighth lens may be a compound lens formed by compounding an aspherical lens portion and a glass substrate portion. On the premise of increasing one surface degree of freedom to realize the function of correcting the optical system with high performance of aberration and imaging performance, the composite lens does not increase the total lens number, reduces the lens volume, and is favorable for realizing the light and thin product.
In an exemplary embodiment, the eighth lens is a compound lens formed by compounding an aspherical lens portion and a glass substrate portion, and the material of the aspherical lens portion may be a stressed deformable material, specifically, plastic, glue, or the like. By way of example, the aspherical lens and the infrared filter are made into a composite lens, and in terms of cost, processing difficulty, process stability and the like, glue can be selected as the material of the aspherical part, and the shrinkage pressure of the glue in the manufacturing process is small, so that the occurrence of the conditions of cracking and the like of the infrared filter caused by the shrinkage pressure can be prevented.
In the exemplary embodiment, the eighth lens is a composite lens formed by compositing an aspherical lens portion and a glass substrate portion, and the aspherical lens portion may have a shape required for design, which is formed by bonding a material of the aspherical lens portion to the glass substrate portion and then embossing the bonded material. The material of the aspheric lens part can be selected as glue or the like, and takes the IR sheet as a substrate in terms of cost, processing difficulty, process stability and the like, adopts a relatively preferable scheme such as a nanoimprint process, has more stable forming, cutting and assembling, has more easily ensured eccentric, inclined, sagittal parameters and the like, and is beneficial to improving the subsequent mass production yield.
In an exemplary embodiment, the imaging lens of the present application may include at least one diaphragm. The diaphragm can restrict the light path and control the intensity of light. The diaphragm may be disposed at an appropriate position of the imaging lens, for example, the diaphragm may be disposed between the object side and the first lens.
In an exemplary embodiment, the above-described image pickup lens may further include a protective glass for protecting the photosensitive element located on the imaging surface, optionally.
The imaging lens according to the above embodiment of the present application may include a barrel, a lens group including first to eighth lenses arranged in order from an object side to an image side along an optical axis, wherein the eighth lens is a compound lens having a plane on one side; the plurality of shading elements comprise first to sixth shading elements which are sequentially arranged between every two adjacent lenses in the first to seventh lenses, and each shading element is respectively contacted with the adjacent lenses on the object side; meanwhile, the maximum length L of the lens barrel in the optical axis direction, the distance T78 from the image side surface of the seventh lens to the object side surface of the eighth lens in the optical axis direction, and the center thickness CT8 of the eighth lens on the optical axis are controlled to satisfy the condition 2<L/(t78+ct 8) <6. By the arrangement of the imaging lens, the thickness of the eighth lens can be reasonably controlled, the process molding of the eighth lens is facilitated, and the yield of the eighth lens can be improved; and the certainty of the arrangement form of the seventh lens and the eighth lens in the lens barrel can be ensured, thereby being beneficial to improving the fixing stability of the lens module end and improving the yield of the lens.
In an embodiment of the present application, one or more of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens may have an aspherical surface, and the aspherical lens has a better radius of curvature characteristic and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.
However, it will be understood by those skilled in the art that the number of lenses constituting the imaging lens may be changed, and the number of light shielding members may be changed, to obtain the respective results and advantages described in the present specification without departing from the technical solution claimed in the present application, which is not particularly limited thereto. For example, although eight lenses are described as an example in the embodiment, the imaging lens is not limited to include eight lenses. The camera lens may also include other numbers of lenses, if desired. For another example, the imaging lens may include other numbers of light shielding members than those described in the above embodiments, as needed.
Specific examples of the imaging lens applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An imaging lens according to embodiment 1 of the present application is described below with reference to fig. 2 to 8. Fig. 2, 3 and 4 show schematic structural views of an imaging lens according to embodiment 1 of the present application in three different embodiments, respectively.
Referring to fig. 2 to 4, the imaging lens includes a barrel P0 and, sequentially arranged from an object side to an image side along an optical axis: 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, and the eighth lens E8, wherein the first lens E1 to the seventh lens E7 are assembled in the lens barrel P0, and the eighth lens E8 is a compound lens with one side being a plane.
In this embodiment, the first lens element E1 has positive refractive power, and the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens E8 is a compound lens formed by compounding a lens portion and a substrate portion, wherein the lens portion has negative optical power, an object side surface S15 thereof is a concave surface, and an image side surface S16 thereof is a plane; the object side surface S16 and the image side surface S17 of the substrate portion are both planar. And the imaging lens further includes an imaging surface S18 located on the image side of the eighth lens E8, and light from the object can sequentially pass through the surfaces S1 to S17 and finally be imaged on the imaging surface S18, for example.
Table 1 shows basic parameters of the imaging lens of embodiment 1, in which the units of the radius of curvature, thickness/distance, and effective radius are all millimeters (mm).
TABLE 1
In embodiment 1, the object side surface and the image side surface of any one of the first lens element E1 to the seventh lens element E7 and the object side surface of the eighth lens element are aspherical surfaces, and the surface profile x of each aspherical lens element can be defined by, but not limited to, the following aspherical surface formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. The following tables 2-1 and 2-2 give the higher order coefficients A that can be used for each of the aspherical mirror faces S1 to S15 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
Face number A4 A6 A8 A10 A12 A14 A16
S1 1.0961E-02 9.6345E-04 -1.1928E-03 -5.4125E-04 -3.0994E-04 -4.9751E-05 -4.3170E-05
S2 -2.4391E-02 1.3073E-02 -3.7812E-03 9.4853E-04 -1.8564E-04 -4.6743E-06 -2.4957E-05
S3 -2.5127E-02 2.6280E-02 -1.2896E-03 2.2022E-03 4.1237E-05 7.9055E-05 -1.9275E-05
S4 -9.1565E-03 8.3949E-03 5.0763E-05 1.0006E-03 2.6336E-04 1.3498E-04 5.0001E-05
S5 -2.3161E-01 -5.1821E-03 2.2780E-03 1.2723E-03 2.6617E-04 4.8816E-05 -1.3759E-05
S6 -2.4450E-01 2.5871E-02 8.7419E-03 2.9680E-03 1.3934E-03 9.9537E-05 -2.5728E-04
S7 -1.3294E-01 6.4386E-03 -2.2793E-03 2.6960E-03 3.2774E-03 9.8158E-04 -1.0776E-04
S8 -2.0633E-01 -2.2678E-02 -5.1379E-03 2.2298E-03 3.2032E-03 2.0695E-03 9.5145E-04
S9 -2.8123E-01 -3.7744E-02 -1.7071E-03 6.6142E-03 -2.6241E-03 3.9454E-04 3.0093E-04
S10 -1.0477E+00 3.1135E-01 -5.9099E-02 2.6504E-02 -2.3716E-02 7.2017E-03 -1.8585E-04
S11 -1.3455E+00 1.8893E-02 8.2436E-02 3.1628E-02 -1.6226E-02 -2.5185E-03 -3.4667E-03
S12 -8.6121E-01 -2.1536E-01 1.4801E-01 -5.5979E-02 6.3550E-03 1.0774E-04 4.1121E-03
S13 -1.7968E+00 6.1269E-01 -1.5097E-01 -1.3777E-03 1.5494E-02 3.5255E-03 -1.0847E-02
S14 -4.9254E+00 1.0366E+00 -2.7023E-01 9.4912E-02 -3.8439E-02 1.6848E-02 -1.0599E-02
S15 7.2558E-01 -2.7883E-02 -8.9938E-02 8.6362E-02 -5.2276E-02 2.7482E-02 -1.3494E-02
TABLE 2-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 -6.0304E-06 -1.5848E-05 1.6664E-06 -2.2648E-06 -7.1657E-07 -4.1025E-06 1.7467E-06
S2 -2.6265E-05 3.5049E-06 -3.0630E-06 1.0223E-05 9.9964E-07 3.3194E-07 -2.6648E-06
S3 -2.9337E-06 5.1290E-06 4.2447E-06 4.5081E-06 4.2396E-06 -2.9475E-06 1.6987E-06
S4 1.7218E-05 2.4241E-06 -1.9275E-06 2.6711E-06 5.6090E-06 4.3706E-06 1.5378E-06
S5 -8.4593E-06 -1.0988E-05 4.3895E-06 5.2842E-07 5.4304E-06 1.7896E-06 1.4311E-07
S6 -7.6103E-05 -2.5958E-05 -1.2666E-05 1.8623E-06 -3.7113E-06 4.6556E-06 -2.4079E-06
S7 -4.6516E-05 -9.8099E-05 -7.2167E-05 -1.4319E-05 -2.8234E-06 2.8138E-06 -3.8754E-07
S8 4.4308E-04 2.0817E-04 5.5484E-05 2.6219E-05 -5.3441E-06 6.8730E-06 -3.3330E-06
S9 3.2662E-05 2.9849E-05 -3.4144E-05 4.6758E-05 -9.6160E-07 1.1221E-05 3.3707E-06
S10 1.0467E-03 -9.1915E-04 4.3478E-05 3.7973E-05 2.0139E-05 -8.7824E-06 -1.4348E-06
S11 3.3551E-03 -8.8776E-04 4.5885E-04 -2.9092E-04 7.0110E-05 -1.3385E-05 -7.6687E-06
S12 1.3836E-03 -2.4249E-03 7.5314E-04 -2.7498E-04 3.2381E-04 -1.1179E-04 1.9426E-06
S13 5.9829E-03 -1.5853E-03 2.5455E-04 -2.3812E-04 1.9366E-04 -4.8787E-05 -1.0341E-05
S14 6.8698E-03 -2.9291E-03 5.9224E-04 -6.2563E-04 4.9650E-04 -1.1952E-04 3.7324E-06
S15 5.4648E-03 -1.4494E-03 1.3420E-03 -1.5085E-03 7.9460E-04 -1.0176E-04 -9.1912E-07
TABLE 2-2
Fig. 2, 3 and 4 show schematic structural views of an imaging lens in three different embodiments of examples 1-1, 1-2 and 1-3, respectively, and as can be seen with reference to fig. 2 to 4, in each embodiment, the imaging lens further includes a plurality of light shielding elements accommodated in a lens barrel P0.
Specifically, in embodiment 1-1, the plurality of light shielding members includes: a first light shielding element P1 located between the first lens E1 and the second lens E2 and contacting the image side surface of the first lens E1; a second light shielding element P2 located between the second lens E2 and the third lens E3 and contacting the image side surface of the second lens E2; a third light shielding element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth light shielding element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fourth auxiliary light shielding element P4b located at the image side of the fourth light shielding element P4 and contacting the image side of the fourth light shielding element P4; a fifth light shielding element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; a sixth light shielding element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6; and a sixth auxiliary light shielding element P6b located at the image side of the sixth light shielding element P6 and in contact with the image side of the sixth light shielding element P6.
In embodiments 1-2 and 1-3, the plurality of light shielding members includes: a first light shielding element P1 located between the first lens E1 and the second lens E2 and contacting the image side surface of the first lens E1; a second light shielding element P2 located between the second lens E2 and the third lens E3 and contacting the image side surface of the second lens E2; a third light shielding element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth light shielding element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth light shielding element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; a sixth light shielding element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6; and a sixth auxiliary light shielding element P6b located at the image side of the sixth light shielding element P6 and in contact with the image side of the sixth light shielding element P6.
The relevant parameter values in examples 1-1, 1-2 and 1-3 are shown in table 9, respectively, referring to fig. 2 to 4 and fig. 1, wherein d1s is the minimum inner diameter of the object side surface of the first light shielding element P1; d2s is the minimum inner diameter of the object side surface of the second light shielding element P2; d4s is the minimum inner diameter of the object side surface of the fourth light shielding element P4; d4m is the minimum inner diameter of the image side surface of the fourth light shielding element P4; d4m is the maximum outer diameter of the image side surface of the fourth light shielding element P4; d5s is the minimum inner diameter of the object side surface of the fifth light shielding element P5; d5m is the minimum inner diameter of the image side surface of the fifth light shielding element P5; d0m is the minimum inner diameter of the image side end face of the lens barrel P0; d0m is the maximum outer diameter of the image side end face of the lens barrel P0; EP01 is a distance between the object side end surface of the lens barrel P0 and the object side surface of the first light shielding element P1 along the optical axis; CP1 is the thickness of the first light shielding element P1 in the optical axis direction; EP12 is a distance from the image side of the first light shielding element P1 to the object side of the second light shielding element P2 along the optical axis; CP2 is the thickness of the second light shielding element P2 in the optical axis direction; EP23 is a distance from the image side surface of the second light shielding element P2 to the object side surface of the third light shielding element P3 along the optical axis; CP3 is the thickness of the third light shielding element P3 in the optical axis direction; EP34 is a distance between the image side surface of the third light shielding element P3 and the object side surface of the fourth light shielding element P4 along the optical axis; CP4 is the thickness of the fourth light shielding element P4 in the optical axis direction; EP45 is a distance between the image side surface of the fourth light shielding element P4 and the object side surface of the fifth light shielding element P5 along the optical axis; CP5 is the thickness of the fifth light shielding member P5 in the optical axis direction; EP56 is a distance between the image side of the fifth light shielding element P5 and the object side of the sixth light shielding element P6 along the optical axis; CP6 is the thickness of the sixth light shielding element P6 in the optical axis direction; l is the maximum length of the lens barrel P0 in the optical axis direction; d0s is the maximum outer diameter of the object side end face of the lens barrel; and d0s is the minimum inner diameter of the object side end face of the lens barrel. The unit of each of the above parameters shown in Table 9 is millimeter (mm).
Fig. 5 shows an on-axis chromatic aberration curve of the imaging lens of embodiment 1, which indicates a focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6 shows a magnification chromatic aberration curve of the imaging lens of embodiment 1, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 7 shows an astigmatism curve of the imaging lens of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8 shows a distortion curve of the imaging lens of embodiment 1, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 5 to 8, the imaging lens provided in embodiment 1 can achieve good imaging quality.
Example 2
An imaging lens according to embodiment 2 of the present application is described below with reference to fig. 9 to 15. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 9, 10 and 11 are schematic views showing the structure of an imaging lens according to embodiment 2 of the present application in three different embodiments, respectively.
Referring to fig. 9 to 11, the imaging lens includes a barrel P0 and, in order from an object side to an image side along an optical axis: 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, and the eighth lens E8, wherein the first lens E1 to the seventh lens E7 are assembled in the lens barrel P0, and the eighth lens E8 is a compound lens with one side being a plane.
In this embodiment, the first lens element E1 has positive refractive power, and the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens E8 is a compound lens formed by compounding a lens portion and a substrate portion, wherein the lens portion has positive optical power, an object side surface S15 thereof is a convex surface, and an image side surface S16 thereof is a plane; the object side surface S16 and the image side surface S17 of the substrate portion are both planar. And the imaging lens further includes an imaging surface S18 located on the image side of the eighth lens E8, and light from the object can sequentially pass through the surfaces S1 to S17 and finally be imaged on the imaging surface S18, for example.
Table 3 shows basic parameters of the imaging lens of embodiment 2, in which the units of the radius of curvature, thickness/distance, and effective radius are all millimeters (mm). Tables 4-1 and 4-2 show the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1 to S15 in example 2 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 3 Table 3
TABLE 4-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 6.7566E-06 2.2124E-05 1.2231E-05 4.0786E-06 -7.7103E-06 -9.1706E-06 -5.7171E-06
S2 -4.8061E-05 5.2121E-05 -4.1411E-06 2.2343E-05 -1.2823E-05 9.7639E-06 -1.0897E-05
S3 -2.2559E-06 -7.2447E-06 6.2390E-07 -1.0618E-05 9.8810E-07 1.2020E-06 8.8416E-06
S4 6.8182E-05 2.6275E-05 1.9304E-05 5.8969E-06 1.0577E-05 2.3842E-06 3.9618E-06
S5 3.6669E-05 1.3901E-05 8.3607E-06 3.3665E-06 4.8650E-06 1.5636E-06 3.4765E-06
S6 -2.3169E-05 6.9978E-05 7.9194E-06 1.0461E-05 -3.3470E-06 5.2976E-06 -6.2424E-07
S7 5.3971E-05 8.7342E-05 -3.4922E-05 4.3770E-06 5.7630E-06 7.3453E-06 -1.7415E-06
S8 5.9725E-05 2.0094E-05 1.6240E-05 4.3406E-06 1.5046E-06 7.5266E-06 1.8169E-06
S9 -3.8059E-04 -7.9479E-04 -2.4388E-04 -6.6784E-05 7.6111E-05 3.8203E-05 3.0421E-05
S10 5.0261E-04 -4.6403E-04 3.1114E-04 -5.0247E-05 -4.4781E-07 -2.9951E-05 1.4247E-05
S11 1.6001E-03 -9.2391E-04 -3.5945E-04 -6.1647E-05 1.3244E-04 6.6429E-06 -1.8177E-05
S12 -1.7732E-03 8.7475E-04 1.1718E-04 3.1073E-04 -8.9530E-05 -1.8100E-05 2.3724E-06
S13 1.7027E-03 -3.4027E-03 1.7812E-03 -6.3464E-05 -3.5409E-04 1.6847E-04 -2.7397E-05
S14 8.2890E-03 -2.7216E-03 1.1302E-03 -1.0693E-03 7.3042E-04 -2.5963E-04 3.8970E-05
S15 1.4315E-03 1.4287E-03 -4.0105E-05 -2.0256E-04 5.3468E-04 -1.1660E-03 6.8556E-04
TABLE 4-2
Fig. 9, 10 and 11 show schematic structural views of an imaging lens in three different embodiments of examples 2-1, 2-2 and 2-3, respectively, and as can be seen with reference to fig. 9 to 11, in each embodiment, the imaging lens further includes a plurality of light shielding elements accommodated in a lens barrel P0.
Specifically, in embodiment 2-1, the plurality of light shielding members includes: a first light shielding element P1 located between the first lens E1 and the second lens E2 and contacting the image side surface of the first lens E1; a second light shielding element P2 located between the second lens E2 and the third lens E3 and contacting the image side surface of the second lens E2; a third light shielding element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth light shielding element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fourth auxiliary light shielding element P4b located at the image side of the fourth light shielding element P4 and contacting the image side of the fourth light shielding element P4; a fifth light shielding element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; a sixth light shielding element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6; and a sixth auxiliary light shielding element P6b located at the image side of the sixth light shielding element P6 and in contact with the image side of the sixth light shielding element P6.
In embodiments 2-2 and 2-3, the plurality of light shielding members includes: a first light shielding element P1 located between the first lens E1 and the second lens E2 and contacting the image side surface of the first lens E1; a second light shielding element P2 located between the second lens E2 and the third lens E3 and contacting the image side surface of the second lens E2; a third light shielding element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth light shielding element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth light shielding element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; a sixth light shielding element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6; and a sixth auxiliary light shielding element P6b located at the image side of the sixth light shielding element P6 and in contact with the image side of the sixth light shielding element P6.
The values of the relevant parameters in examples 2-1, 2-2 and 2-3 are shown in Table 9, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 9 are millimeters (mm).
Fig. 12 shows an on-axis chromatic aberration curve of the imaging lens of embodiment 2, which indicates a focus deviation of light rays of different wavelengths after passing through the lens. Fig. 13 shows a magnification chromatic aberration curve of the imaging lens of embodiment 2, which represents the deviation of different image heights on an imaging plane after light passes through the lens. Fig. 14 shows an astigmatism curve of the imaging lens of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 15 shows a distortion curve of the imaging lens of embodiment 2, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 12 to 15, the imaging lens provided in embodiment 2 can achieve good imaging quality.
Example 3
An imaging lens according to embodiment 3 of the present application is described below with reference to fig. 16 to 22. Fig. 16, 17 and 18 show schematic structural views of an imaging lens according to embodiment 3 of the present application in three different embodiments, respectively.
Referring to fig. 16 to 18, the imaging lens includes a barrel P0 and, in order from an object side to an image side along an optical axis: 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, and the eighth lens E8, wherein the first lens E1 to the seventh lens E7 are assembled in the lens barrel P0, and the eighth lens E8 is a compound lens with one side being a plane.
In this embodiment, the first lens element E1 has positive refractive power, and the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has negative refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is convex, and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is concave, and an image-side surface S10 thereof is concave. The sixth lens element E6 has positive refractive power, wherein an object-side surface S11 thereof is convex and an image-side surface S12 thereof is concave. The seventh lens element E7 has negative refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens E8 is a compound lens formed by compounding a lens portion and a substrate portion, wherein the lens portion has positive optical power, an object side surface S15 thereof is a convex surface, and an image side surface S16 thereof is a plane; the object side surface S16 and the image side surface S17 of the substrate portion are both planar. And the imaging lens further includes an imaging surface S18 located on the image side of the eighth lens E8, and light from the object can sequentially pass through the surfaces S1 to S17 and finally be imaged on the imaging surface S18, for example.
Table 5 shows basic parameters of the imaging lens of embodiment 3, in which the units of the radius of curvature, thickness/distance, and effective radius are all millimeters (mm). Tables 6-1 and 6-2 show that each of the non-elements used in example 3Higher order term coefficients A of spherical mirrors S1 to S15 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 5
Face number A4 A6 A8 A10 A12 A14 A16
S1 -2.0317E-02 -8.0953E-03 -2.4137E-03 -4.8220E-04 -6.2394E-05 7.0474E-06 -2.0516E-06
S2 -7.0783E-02 7.2906E-03 -2.4900E-03 5.7995E-04 -7.6451E-05 -3.0763E-06 -9.9830E-06
S3 -3.2850E-02 2.0802E-02 -9.7515E-04 1.2071E-03 -6.7775E-05 -1.5800E-05 -1.1028E-05
S4 1.7511E-03 6.3611E-03 -4.0639E-04 4.2932E-04 4.9058E-05 1.7249E-05 6.7984E-06
S5 -1.4773E-01 -8.0840E-03 -1.0880E-03 6.6864E-04 2.4204E-04 8.5999E-05 1.6577E-05
S6 -2.0075E-01 1.5915E-02 4.5747E-03 2.3321E-03 6.1674E-04 -1.0331E-04 -3.4143E-05
S7 -1.3790E-01 5.8038E-02 4.6653E-03 -3.0799E-03 -1.4373E-03 -1.0358E-03 1.4102E-04
S8 -2.0007E-01 5.5477E-02 3.1265E-02 8.3806E-05 -3.4949E-03 -4.8588E-03 -2.7108E-03
S9 -1.6275E-01 -2.8348E-01 5.7017E-02 3.3508E-02 2.1661E-02 1.4349E-03 -2.5791E-03
S10 -1.1732E+00 1.6837E-01 -7.1322E-03 3.6007E-02 -3.4512E-02 1.0104E-02 -4.7337E-04
S11 -5.0303E+00 1.0860E+00 -1.6343E-01 -3.7895E-02 1.8511E-02 1.9474E-02 -2.2006E-02
S12 -2.5782E+00 2.3030E-01 1.1867E-01 -1.1518E-01 4.8444E-02 -2.4696E-03 9.9533E-03
S13 -2.0573E+00 8.7895E-01 -3.7566E-01 1.6128E-01 -7.6786E-02 5.2305E-02 -2.8709E-02
S14 -6.6602E+00 1.5304E+00 -4.5002E-01 1.8714E-01 -9.0155E-02 3.3420E-02 -1.1676E-02
S15 1.5720E-01 5.6822E-01 -6.6231E-02 8.6890E-02 -1.1368E-01 -4.9504E-02 -1.5127E-01
TABLE 6-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 2.2905E-06 -2.9962E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S2 -4.6571E-06 9.6795E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S3 -3.1654E-06 -7.9549E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S4 -5.0366E-07 -4.1529E-08 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S5 -5.8724E-06 2.6174E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S6 -4.6050E-05 2.5109E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00
S7 -6.0024E-05 -9.1351E-05 -8.0614E-05 2.3139E-05 7.6819E-06 -6.8809E-06 1.0133E-06
S8 -8.3469E-04 1.9251E-04 3.8389E-04 3.0906E-04 1.6918E-04 6.8550E-05 9.1250E-06
S9 -4.0912E-03 -1.6885E-03 -3.2215E-04 4.1724E-04 3.8118E-04 1.6127E-04 5.5623E-05
S10 -1.8753E-03 -2.0883E-03 -1.5227E-03 -4.5356E-04 -5.6976E-04 -1.7205E-04 -8.8626E-05
S11 4.5878E-03 4.1168E-03 -2.8344E-03 -6.2927E-04 7.5211E-04 -1.6050E-05 -1.7677E-04
S12 -1.6392E-02 3.8275E-03 3.3304E-04 1.6264E-03 -2.6860E-03 1.0445E-04 -1.0818E-04
S13 -2.5461E-03 1.3756E-02 -6.6259E-03 -3.1366E-03 3.6844E-03 5.1266E-04 -9.4724E-04
S14 1.6248E-02 -1.7183E-03 2.1199E-03 2.1060E-03 2.0081E-03 3.3225E-04 3.5351E-04
S15 -1.9859E-02 2.0348E-02 9.4316E-02 6.1456E-02 4.9371E-02 1.2804E-02 6.1595E-03
TABLE 6-2
Fig. 16, 17 and 18 show schematic structural views of an imaging lens in three different embodiments of examples 3-1, 3-2 and 3-3, respectively, and as can be seen with reference to fig. 16 to 18, in each embodiment, the imaging lens further includes a plurality of light shielding members accommodated in a lens barrel P0.
Specifically, in embodiments 3-1, 3-2, and 3-3, the plurality of light shielding members includes: a first light shielding element P1 located between the first lens E1 and the second lens E2 and contacting the image side surface of the first lens E1; a second light shielding element P2 located between the second lens E2 and the third lens E3 and contacting the image side surface of the second lens E2; a third light shielding element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth light shielding element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fourth auxiliary light shielding element P4b located at the image side of the fourth light shielding element P4 and contacting the image side of the fourth light shielding element P4; a fifth light shielding element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; a fifth auxiliary light shielding element P5b located at the image side of the fifth light shielding element P5 and contacting the image side of the fifth light shielding element P5; and a sixth light shielding member P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6.
The values of the relevant parameters in examples 3-1, 3-2 and 3-3 are shown in Table 9, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 9 are millimeters (mm).
Fig. 19 shows an on-axis chromatic aberration curve of the imaging lens of embodiment 3, which indicates a focus deviation of light rays of different wavelengths after passing through the lens. Fig. 20 shows a magnification chromatic aberration curve of the imaging lens of embodiment 3, which represents the deviation of different image heights on an imaging plane after light passes through the lens. Fig. 21 shows an astigmatism curve of the imaging lens of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 22 shows a distortion curve of the imaging lens of embodiment 3, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 19 to 22, the imaging lens provided in embodiment 3 can achieve good imaging quality.
Example 4
An imaging lens according to embodiment 4 of the present application is described below with reference to fig. 23 to 29. Fig. 23, 24 and 25 are schematic views showing the structure of an imaging lens according to embodiment 4 of the present application in three different embodiments, respectively.
Referring to fig. 23 to 25, the imaging lens includes a barrel P0 and, in order from an object side to an image side along an optical axis: 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, and the eighth lens E8, wherein the first lens E1 to the seventh lens E7 are assembled in the lens barrel P0, and the eighth lens E8 is a compound lens with one side being a plane.
In this embodiment, the first lens element E1 has positive refractive power, and the object-side surface S1 thereof is convex and the image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The fifth lens element E5 has positive refractive power, wherein an object-side surface S9 thereof is convex, and an image-side surface S10 thereof is concave. The sixth lens element E6 has negative refractive power, wherein an object-side surface S11 thereof is concave and an image-side surface S12 thereof is convex. The seventh lens element E7 has positive refractive power, wherein an object-side surface S13 thereof is convex, and an image-side surface S14 thereof is concave. The eighth lens E8 is a compound lens formed by compounding a lens portion and a substrate portion, wherein the lens portion has negative optical power, an object side surface S15 thereof is a concave surface, and an image side surface S16 thereof is a plane; the object side surface S16 and the image side surface S17 of the substrate portion are both planar. And the imaging lens further includes an imaging surface S18 located on the image side of the eighth lens E8, and light from the object can sequentially pass through the surfaces S1 to S17 and finally be imaged on the imaging surface S18, for example.
Table 7 shows basic parameters of the imaging lens of embodiment 4, in which the units of the radius of curvature, thickness/distance, and effective radius are all millimeters (mm). Tables 8-1 and 8-2 show the higher order term coefficients A that can be used for each of the aspherical mirror faces S1 to S15 in example 4 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 Wherein each aspherical surface profile can be defined by the formula (1) given in the above-described embodiment 1.
TABLE 7
Face number A4 A6 A8 A10 A12 A14 A16
S1 1.0842E-02 9.7769E-04 -2.4020E-04 -1.5377E-05 -5.6385E-05 1.4458E-05 -1.4765E-05
S2 2.6387E-02 -3.8041E-03 -6.7891E-04 -6.7104E-05 -6.2244E-05 1.5227E-05 5.3317E-06
S3 -6.2977E-02 5.9214E-03 -1.2354E-03 2.7314E-04 -1.1780E-04 3.9443E-05 -7.2455E-06
S4 -5.3285E-02 1.3733E-02 5.0075E-04 4.9295E-04 -3.4051E-05 -5.0883E-06 -1.5214E-05
S5 2.1877E-02 2.6845E-03 9.7197E-04 2.0149E-04 -2.9301E-05 -3.6091E-05 -1.8555E-05
S6 1.4392E-02 2.1524E-03 2.6716E-03 5.7716E-04 1.6009E-04 -1.1891E-04 -1.6657E-05
S7 -1.4353E-01 -7.7852E-03 1.4717E-03 7.0473E-04 4.4248E-04 -2.6433E-04 5.8592E-06
S8 -3.0835E-01 3.7758E-02 5.7958E-04 4.7105E-04 -3.2293E-05 -1.0273E-03 3.4549E-04
S9 -6.9607E-01 8.2110E-02 2.9534E-03 -9.5825E-04 -1.4603E-04 -8.8858E-04 5.2901E-04
S10 -3.2485E-01 1.4950E-02 1.1194E-02 -5.7595E-03 4.7490E-04 2.9177E-04 -1.1293E-04
S11 1.0477E+00 -1.0396E-01 1.0648E-02 -4.9283E-03 1.5117E-03 -4.0298E-04 1.0071E-04
S12 3.9254E-01 5.9979E-02 -3.4866E-02 1.1760E-03 1.3324E-03 -1.2422E-03 7.4138E-04
S13 -2.3846E+00 3.4812E-01 8.6401E-03 -9.6317E-03 -9.7899E-03 6.1323E-03 -1.1140E-03
S14 -1.6186E+00 -6.0827E-02 -1.5894E-02 1.0738E-02 5.4015E-04 6.4746E-03 8.6374E-04
S15 2.8460E+00 -3.1364E-01 -1.1741E-01 7.2950E-02 -5.6165E-02 2.1393E-02 -1.5481E-03
TABLE 8-1
Face number A18 A20 A22 A24 A26 A28 A30
S1 1.0085E-05 -4.9675E-06 4.9706E-06 -5.4046E-06 1.7404E-06 -2.4024E-06 1.6101E-06
S2 -1.0540E-06 -1.2571E-06 -1.7533E-06 7.7016E-07 -7.1655E-07 1.2082E-06 -3.9869E-07
S3 1.2801E-05 1.8536E-07 -5.0178E-08 -8.3397E-06 -4.2682E-06 -2.4737E-06 2.4480E-06
S4 -1.7126E-06 1.1358E-05 6.9629E-06 2.7526E-06 -1.8843E-06 8.7417E-07 2.9589E-07
S5 4.8600E-06 -2.8125E-06 3.0978E-06 -3.7512E-06 -5.5161E-07 -3.7460E-06 2.1461E-06
S6 -3.3115E-05 8.2559E-06 -4.5643E-07 3.5494E-06 3.0814E-07 3.5393E-06 3.1197E-06
S7 -7.0415E-05 -2.3064E-05 -9.8107E-06 6.2215E-06 -6.2321E-07 3.8464E-06 6.6256E-07
S8 -7.5421E-05 4.7178E-05 -9.7206E-06 2.8038E-05 -1.6172E-05 1.3080E-05 -1.1149E-05
S9 2.4903E-05 -1.6051E-05 1.3849E-05 1.9366E-05 -2.3166E-05 8.8767E-06 -1.1716E-05
S10 7.0559E-06 -9.0924E-06 9.5165E-05 3.5442E-05 -1.7857E-05 -3.3245E-06 -1.3309E-05
S11 -9.5447E-05 9.6619E-05 -3.2282E-05 5.8997E-05 -5.4714E-05 5.0735E-06 4.4588E-06
S12 2.0837E-04 -3.8444E-04 -1.7047E-05 2.0833E-04 -4.7078E-05 -6.1383E-05 2.6227E-05
S13 -1.7336E-04 -2.1723E-04 2.4522E-04 -1.2542E-05 -7.3854E-05 9.6012E-06 1.4851E-05
S14 -1.2423E-03 -1.1933E-03 1.7567E-04 -9.7749E-05 2.4613E-05 1.6183E-04 -5.8038E-05
S15 -5.7810E-04 -4.8086E-04 1.8744E-03 -2.2661E-03 3.3946E-04 7.7024E-04 -1.8232E-04
TABLE 8-2
Fig. 23, 24 and 25 show schematic structural views of an imaging lens in three different embodiments of examples 4-1, 4-2 and 4-3, respectively, and as can be seen with reference to fig. 23 to 25, in each embodiment, the imaging lens further includes a plurality of light shielding members accommodated in a lens barrel P0.
Specifically, in embodiments 4-1, 4-2, and 4-3, the plurality of light shielding members includes: a first light shielding element P1 located between the first lens E1 and the second lens E2 and contacting the image side surface of the first lens E1; a second light shielding element P2 located between the second lens E2 and the third lens E3 and contacting the image side surface of the second lens E2; a third light shielding element P3 located between the third lens E3 and the fourth lens E4 and in contact with the image side surface of the third lens E3; a fourth light shielding element P4 located between the fourth lens E4 and the fifth lens E5 and in contact with the image side surface of the fourth lens E4; a fifth light shielding element P5 located between the fifth lens E5 and the sixth lens E6 and in contact with the image side surface of the fifth lens E5; a fifth auxiliary light shielding element P5b located at the image side of the fifth light shielding element P5 and contacting the image side of the fifth light shielding element P5; a sixth light shielding element P6 located between the sixth lens E6 and the seventh lens E7 and in contact with the image side surface of the sixth lens E6; and a sixth auxiliary light shielding element P6b located at the image side of the sixth light shielding element P6 and in contact with the image side of the sixth light shielding element P6.
The values of the relevant parameters in examples 4-1, 4-2 and 4-3 are shown in Table 9, respectively, wherein the meanings of the parameters are as described above, and the description thereof will not be repeated, and the units of the parameters shown in Table 9 are millimeters (mm).
Fig. 26 shows an on-axis chromatic aberration curve of the imaging lens of embodiment 4, which indicates a focus deviation of light rays of different wavelengths after passing through the lens. Fig. 27 shows a magnification chromatic aberration curve of the imaging lens of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. Fig. 28 shows an astigmatism curve of the imaging lens of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 29 shows a distortion curve of the imaging lens of embodiment 4, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 26 to 29, the imaging lens provided in embodiment 4 can achieve good imaging quality.
TABLE 9
Further, in embodiments 1 to 4, effective focal length values f1 to f8 of the respective lenses, effective focal length f of the imaging lens, distance TTL from the object side surface of the first lens to the imaging surface of the imaging lens along the optical axis, half of the diagonal length ImgH of the effective pixel region on the imaging surface, maximum half field angle Semi-FOV of the imaging lens, and aperture value fno of the imaging lens are shown in table 10.
Parameters/embodiments 1 2 3 4
f1(mm) 5.97 5.93 5.62 4.84
f2(mm) -16.41 -16.97 -19.02 -8.32
f3(mm) -41.09 -34.04 -20.08 23.27
f4(mm) 23.30 16.17 12.45 -13.47
f5(mm) -8.14 -8.45 -8.13 9.23
f6(mm) 6.59 3.96 5.03 -34.68
f7(mm) 60.12 -4.69 -7.75 11.49
f8(mm) -12.25 204.38 190.10 -9.17
f(mm) 5.99 5.73 5.46 5.69
TTL(mm) 7.29 7.26 7.00 7.22
ImgH(mm) 5.36 5.36 5.05 5.00
Semi-FOV(°) 41.25 42.25 42.07 40.43
fno 1.72 1.61 1.87 1.95
Table 10
Examples 1 to 4 satisfy the conditions shown in tables 11-1 and 11-2, respectively.
Condition/example 1-1 1-2 1-3 2-1 2-2 2-3
L/(T78+CT8) 2.09 2.08 2.08 4.21 4.44 4.44
CT6/EP56×N6 1.39 1.40 1.40 1.33 1.33 1.33
∑CT/∑CP 7.95 29.09 26.53 9.81 35.05 33.46
R8/d4s+R9/d4m -4.55 -6.07 -6.07 0.27 0.52 0.52
f5/(D4m-d4m) -10.72 -3.63 -3.63 -15.37 -3.89 -3.91
∑EP/∑CP/fno 4.16 16.78 15.25 5.02 19.58 18.65
f1/d1s-f2/d2s 7.30 7.30 7.30 7.55 7.55 7.55
f/(D0s-d0s) 3.46 7.48 7.48 2.11 2.11 2.11
f/(TTL-L) 2.78 2.77 2.77 4.46 6.00 6.00
d5m/R11+d5s/R10 2.41 2.41 2.41 4.39 4.33 4.35
TABLE 11-1
Condition/example 3-1 3-2 3-3 4-1 4-2 4-3
L/(T78+CT8) 5.70 5.70 5.70 3.42 3.42 3.42
CT6/EP56×N6 0.64 0.64 0.64 2.84 2.84 2.84
∑CT/∑CP 9.45 33.40 29.69 5.48 5.48 5.48
R8/d4s+R9/d4m -3.70 -4.70 -4.70 2.95 2.95 2.95
f5/(D4m-d4m) -14.27 -4.07 -4.07 5.89 5.89 5.89
∑EP/∑CP/fno 5.25 19.96 17.68 2.00 2.00 2.00
f1/d1s-f2/d2s 8.70 8.70 8.70 4.59 4.59 4.59
f/(D0s-d0s) 2.01 2.01 2.00 2.09 2.09 2.09
f/(TTL-L) 5.29 5.29 5.29 4.22 4.22 4.22
d5m/R11+d5s/R10 4.43 4.43 4.43 -1.16 -1.16 -1.16
TABLE 11-2
The application also provides an imaging device provided with an electron-sensitive element for imaging, which can be a photosensitive coupling element (Charge Coupled Device, CCD) or a complementary metal-oxide-semiconductor element (Complementary Metal Oxide Semiconductor, CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the above-described imaging lens.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the application is not limited to the specific combination of the above technical features, but also encompasses other technical features which may be combined with any combination of the above technical features or their equivalents without departing from the spirit of the application. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (19)

1. The imaging lens comprises a lens barrel, a lens group and a plurality of shading elements, and is characterized in that,
the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from an object side to an image side along an optical axis, wherein the eighth lens is a compound lens with one side being a plane;
the plurality of shading elements includes: a first light shielding element located between the first lens and the second lens and in contact with an image side surface portion of the first lens; a second light shielding member located between the second lens and the third lens and in contact with an image side surface portion of the second lens; a third light shielding element located between the third lens and the fourth lens and in contact with an image side surface portion of the third lens; a fourth light shielding element located between the fourth lens and the fifth lens and in contact with an image side surface portion of the fourth lens; a fifth light shielding member located between the fifth lens and the sixth lens and in contact with an image side surface portion of the fifth lens; and a sixth light shielding element located between the sixth lens and the seventh lens and in contact with an image side surface portion of the sixth lens;
The imaging lens satisfies:
2<L/(T78+CT8)<6，
wherein L is the maximum length of the lens barrel along the optical axis direction, T78 is the distance from the image side surface of the seventh lens to the object side surface of the eighth lens along the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis.
2. The imaging lens according to claim 1, wherein a center thickness CT6 of the sixth lens on the optical axis, a distance EP56 from an image side surface of the fifth light shielding element to an object side surface of the sixth light shielding element along the optical axis, and a refractive index N6 of the sixth lens satisfy:
0<CT6/EP56×N6<3。
3. the imaging lens according to claim 1, wherein a sum Σct of center thicknesses of each of the first to eighth lenses on the optical axis and a sum Σcp of thicknesses of each of the first to sixth light shielding elements in the optical axis direction satisfy:
5<∑CT/∑CP<40。
4. the imaging lens according to claim 1, wherein a total sum Σep of distances from an object-side end face of the lens barrel to an object-side face of the first light shielding element along the optical axis and pitches of each adjacent two of the first light shielding element to the sixth light shielding element along the optical axis, a total sum Σcp of thicknesses of each of the first light shielding element to the sixth light shielding element along the optical axis direction, and an aperture value fno of the imaging lens satisfy:
0<∑EP/∑CP/fno<20。
5. The imaging lens system according to claim 1, wherein a radius of curvature R8 of an image side surface of the fourth lens element, a minimum inner diameter d4s of an object side surface of the fourth light shielding element, a radius of curvature R9 of an object side surface of the fifth lens element, and a minimum inner diameter d4m of an image side surface of the fourth light shielding element satisfy:
-10<R8/d4s+R9/d4m<5。
6. the imaging lens according to claim 1, wherein an effective focal length f5 of the fifth lens, a maximum outer diameter D4m of an image side surface of the fourth light shielding element, and a minimum inner diameter D4m of the image side surface of the fourth light shielding element satisfy:
-20<f5/(D4m-d4m)<10。
7. the imaging lens according to claim 1, wherein an effective focal length f1 of the first lens, a minimum inner diameter d1s of an object side surface of the first light shielding element, an effective focal length f2 of the second lens, and a minimum inner diameter d2s of an object side surface of the second light shielding element satisfy:
0<f1/d1s-f2/d2s<10。
8. the imaging lens according to any one of claims 1 to 7, wherein an effective focal length f of the imaging lens, a maximum outer diameter D0s of an object-side end surface of the lens barrel, and a minimum inner diameter D0s of the object-side end surface of the lens barrel satisfy:
0<f/(D0s-d0s)<10。
9. the imaging lens according to any one of claims 1 to 7, wherein an effective focal length f of the imaging lens, a distance TTL from an object side surface of the first lens to an imaging surface of the imaging lens along the optical axis, and a maximum length L of the lens barrel in the optical axis direction satisfy:
2<f/(TTL-L)<8。
10. The imaging lens system according to any one of claims 1 to 7, wherein a minimum inner diameter d5m of an image side surface of the fifth light shielding element, a radius of curvature R11 of an object side surface of the sixth lens, a minimum inner diameter d5s of an object side surface of the fifth light shielding element, and a radius of curvature R10 of an image side surface of the fifth lens satisfy:
-2<d5m/R11+d5s/R10<5。
11. the imaging lens according to any one of claims 1 to 7, wherein the plurality of light shielding members further include: and the fourth auxiliary shading element is positioned at the image side of the fourth shading element and is contacted with the image side surface part of the fourth shading element.
12. The imaging lens according to any one of claims 1 to 7, wherein the plurality of light shielding members further include: and a fifth auxiliary light shielding element positioned at the image side of the fifth light shielding element and contacted with the image side surface part of the fifth light shielding element.
13. The imaging lens according to any one of claims 1 to 7, wherein the plurality of light shielding members further include: a sixth auxiliary light shielding element located on the image side of the sixth light shielding element and in contact with the image side portion of the sixth light shielding element.
14. The imaging lens according to any one of claims 1 to 7, wherein the eighth lens comprises a material having an infrared cut-off filter function so that the eighth lens has the infrared cut-off filter function.
15. The imaging lens according to any one of claims 1 to 7, wherein an image side surface of the eighth lens has an infrared cut-off layer so that the eighth lens has an infrared cut-off filter function.
16. The imaging lens according to any one of claims 1 to 7, wherein the eighth lens is a compound lens including an aspherical lens portion and a substrate portion made of glass.
17. The imaging lens as claimed in claim 16, wherein the material of the aspherical lens part is a force deformable material.
18. The imaging lens according to claim 16, wherein the material of the aspherical lens part is plastic or glue.
19. The imaging lens according to claim 16, wherein the shape of the aspherical lens portion is formed by adhering a material of the aspherical lens portion to the glass substrate portion and then embossing.
CN202320843515.2U 2023-04-11 2023-04-11 Image pickup lens Active CN219625796U (en)

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