CN116931216A - Imaging system assembly - Google Patents

Abstract

The application discloses an imaging system component, comprising: the lens assembly sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens; the plurality of spacers includes a first spacer, a second spacer, a third spacer, and a fourth spacer; a lens barrel; the maximum height L of the lens barrel in the optical axis direction and half of the diagonal length of the effective pixel area on the imaging surface of the imaging system component satisfy: L/ImgH is more than 0.7 and less than 1.3; the air interval T23 of the second lens and the third lens on the optical axis, the air interval T34 of the third lens and the fourth lens on the optical axis, and the interval distance EP23 of the second spacer and the third spacer in the optical axis direction satisfy: 1.0 < (T23+T34)/EP 23 < 3.0; and an air space T12 of the first lens and the second lens on the optical axis, an air space T45 of the fourth lens and the fifth lens on the optical axis, a maximum thickness CP1 of the first spacer in the optical axis direction, and a maximum thickness CP4 of the fourth spacer in the optical axis direction satisfy: (T12+T45)/(CP1+CP4) is less than or equal to 3.0.

Description

Imaging System Components

Technical Field

The present application relates to the field of optical elements, and in particular, to an imaging system component.

Background Art

With the development of science and technology, people have higher and higher requirements for mobile phones. Manufacturers have been working hard to make smartphones thinner and lighter, but they are often limited by the length of the phone lens. Generally speaking, the more lenses there are, the higher the pixels are, and the clearer the photos are. However, the more lenses there are, the longer the total length of the lens is. Therefore, while ensuring the number of lenses and pixels, making the lens smaller to meet the characteristics of miniaturization and ultra-thinness of mobile phones is one of the main directions of current mobile phone development.

In addition, the finished product yield of existing five-element optical imaging lenses is usually around 40%. How to ensure miniaturization and improve the yield has become a difficult problem to be solved.

Summary of the invention

The present application provides such an imaging system component, which includes: a lens group, which includes: a first lens, a second lens, a third lens, a fourth lens and a fifth lens in order from the object side to the image side along the optical axis; a plurality of spacers including: a first spacer, which is placed between the first lens and the second lens and in contact with the image side surface of the first lens; a second spacer, which is placed between the second lens and the third lens and in contact with the image side surface of the second lens; a third spacer, which is placed between the third lens and the fourth lens and in contact with the image side surface of the third lens; and a fourth spacer, which is placed between the fourth lens and the fifth lens and in contact with the image side surface of the fourth lens; a lens barrel, which is used to accommodate the lens group and the plurality of spacers; wherein the maximum height L of the lens barrel along the optical axis direction is in contact with the image side surface of the lens barrel. Half the diagonal length of the effective pixel area on the imaging plane of the system component ImgH satisfies: 0.7＜L/ImgH＜1.3; the air gap T23 between the second lens and the third lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the spacing distance EP23 between the second spacer and the third spacer along the optical axis satisfy: 1.0＜(T23+T34)/EP23＜3.0; and the air gap T12 between the first lens and the second lens on the optical axis, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum thickness CP1 of the first spacer along the optical axis, and the maximum thickness CP4 of the fourth spacer along the optical axis satisfy: (T12+T45)/(CP1+CP4)≤3.0.

In one embodiment, the effective focal length f of the imaging system component, the curvature radius R2 of the image side surface of the first lens, the inner diameter d1m of the image side surface of the first spacer, the inner diameter d2s of the object side surface of the second spacer and the effective focal length f1 of the first lens satisfy: -0.7＜f/R2＜-0.4 and -0.5＜(d1m-d2s)/f1＜0.5.

In one embodiment, the effective focal length f2 of the second lens, the refractive index N2 of the second lens, the inner diameter d2s of the object side surface of the second spacer and the inner diameter d2m of the image side surface of the second spacer satisfy: -4.0＜f2×N2/(d2s+d2m)＜-2.5.

In one embodiment, the maximum thickness CP1 of the first spacer along the optical axis, the maximum thickness CP2 of the second spacer along the optical axis, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 0.0＜(CP2×CT2)/(CP1×CT1)＜0.5.

In one embodiment, the spacing distance EP01 between the object side end face of the lens barrel and the object side face of the first spacer along the optical axis, the spacing distance EP12 between the first spacer and the second spacer along the optical axis, the air spacing T12 between the first lens and the second lens on the optical axis, and the air spacing T23 between the second lens and the third lens on the optical axis satisfy: 4.0＜T23×EP12/(T12×EP01)＜9.0.

In one embodiment, the object side surface of the third lens has at least one inflection point, the image side surface of the third lens has at least one inflection point, and the imaging system component satisfies: 0.5＜EP23/CT3＜1.2, wherein CT3 is the center thickness of the third lens on the optical axis, and EP23 is the spacing distance between the second spacer and the third spacer along the optical axis.

In one embodiment, the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the inner diameter d2m of the image side surface of the second spacer and the inner diameter d3s of the object side surface of the third spacer satisfy: 0.0＜d3s/R6-d2m/R5＜0.5.

In one embodiment, the center thickness CT4 of the fourth lens on the optical axis and the spacing distance EP34 between the third spacer and the fourth spacer along the optical axis direction satisfy: 1.2＜CT4/EP34＜2.1.

In one embodiment, the outer diameter D3m of the image side surface of the third spacer, the outer diameter D4s of the object side surface of the fourth spacer, the curvature radius R7 of the object side surface of the fourth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: -10.0＜D3m/R7+D4s/R8＜-5.0.

In one embodiment, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, the maximum thickness CP3 of the third spacer along the optical axis, and the maximum thickness CP4 of the fourth spacer along the optical axis satisfy: -1.0＜(f4×N4×CP3)/(f5×N5×CP4)＜0.0.

In one embodiment, the inner diameter d4s of the object side surface of the fourth spacer, the inner diameter d3m of the image side surface of the third spacer, and the combined focal length f45 of the fourth lens and the fifth lens satisfy: 1.0＜(d4s+d3m)/f45＜1.8.

In one embodiment, the outer diameter D3s of the object side surface of the third spacer, the outer diameter D2m of the image side surface of the second spacer, and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.0＜(D3s-D2m)/f34＜1.1.

The imaging system component provided in the present application satisfies 0.7＜L/ImgH＜1.3, 1.0＜(T23+T34)/EP23＜3.0 and (T12+T45)/(CP1+CP4)≤3.0, and reasonably controls the maximum height of the lens barrel, the spacing distance between the lenses, the thickness of the first spacer and the fourth spacer, and the spacing distance between the second spacer and the third spacer along the optical axis. The air gap between the lenses is designed to be compact, which can effectively shorten the lens length, facilitate miniaturized design, and match more application scenarios. Specifically, in order to ensure the miniaturization of the system, when the air gap between the second lens and the third lens, the air gap between the third lens and the fourth lens, and the spacing between the second spacer and the third spacer are large, by controlling the air gap between the first lens and the second lens, the thickness of the first spacer, the air gap between the fourth lens and the fifth lens, and the thickness of the fourth spacer, the system miniaturization is achieved while ensuring the assembly stability, thereby improving the yield rate of the imaging system components. By controlling the lens barrel height and the image height ratio, it is helpful to ensure the performance and appearance of the imaging system components and ensure that the imaging system components match the chip during design.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG1 shows a structural arrangement diagram of an imaging system component and a schematic diagram of some parameters according to the present application;

FIG2A shows a schematic structural diagram of an imaging system assembly according to Embodiment 1 of the present application;

FIG2B shows a schematic structural diagram of an imaging system component according to Embodiment 2 of the present application;

3A to 3D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens according to Example 1 and Example 2 of the present application;

FIG4A shows a schematic structural diagram of an imaging system assembly according to Embodiment 3 of the present application;

FIG4B shows a schematic structural diagram of an imaging system assembly according to Embodiment 4 of the present application;

5A to 5D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens according to Example 3 and Example 4 of the present application;

FIG6A shows a schematic structural diagram of an imaging system component according to Embodiment 5 of the present application;

FIG6B shows a schematic structural diagram of an imaging system assembly according to Embodiment 6 of the present application;

7A to 7D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens according to Example 5 and Example 6 of the present application;

FIG8A shows a schematic structural diagram of an imaging system assembly according to Embodiment 7 of the present application;

FIG8B shows a schematic structural diagram of an imaging system component according to Embodiment 8 of the present application; and

9A to 9D respectively show an axial chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging lens according to Example 7 and Example 8 of the present application.

DETAILED DESCRIPTION

In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

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

In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

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

It should also be understood that the terms "comprises", "including", "having", "includes" and/or "comprising", when used in this specification, indicate the presence of the stated features, elements and/or components, but do not exclude the presence or addition of one or more other features, elements, components and/or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

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

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

The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. FIG1 shows a structural arrangement diagram of an imaging system component according to the present application and a schematic diagram of some parameters. Those skilled in the art should understand that some parameters of lenses commonly used in the art, such as the center thickness CT1 of the first lens on the optical axis, are not shown in FIG1. FIG1 only exemplarily shows some parameters of the lens barrel and spacer of an imaging system component of the present application, so as to facilitate a better understanding of the present invention. As shown in Figure 1, L represents the maximum height of the lens barrel along the optical axis, EP01 represents the spacing distance between the object side end face of the lens barrel and the object side face of the first spacer along the optical axis, EP23 is the spacing distance between the second spacer and the third spacer along the optical axis, EP34 is the spacing distance between the third spacer and the fourth spacer along the optical axis, CP2 represents the maximum thickness of the second spacer along the optical axis, CP3 is the maximum thickness of the third spacer along the optical axis, CP4 is the maximum thickness of the fourth spacer along the optical axis, d2s represents the inner diameter of the object side face of the second spacer, D2m is the outer diameter of the image side face of the second spacer, d3s is the inner diameter of the object side face of the third spacer, d4s is the inner diameter of the object side face of the fourth spacer, and D3s is the outer diameter of the object side face of the third spacer.

An imaging system assembly according to an exemplary embodiment of the present application includes a lens barrel, a lens group and a plurality of spacers disposed in the lens barrel. The lens group includes, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein any two adjacent lenses from the first lens to the fifth lens may have a spacing distance between them.

In an exemplary embodiment, the plurality of spacers may include at least one of a first spacer, a second spacer, a third spacer, and a fourth spacer, wherein the first spacer is placed between the first lens and the second lens and in contact with the image side of the first lens; the second spacer is placed between the second lens and the third lens and in contact with the image side of the second lens, the third spacer is placed between the third lens and the fourth lens and in contact with the image side of the third lens, and the fourth spacer is placed between the fourth lens and the fifth lens and in contact with the image side of the fourth lens. It should be understood that the present application does not specifically limit the number of spacers, and any number of spacers may be included between any two lenses, and the entire imaging system assembly may also include any number of spacers. The spacer helps the imaging system assembly intercept excess refractive and reflective light paths and reduce the generation of stray light and ghosting. Adding auxiliary support between the spacer and the lens barrel is conducive to improving the problems of poor assembly stability and low performance yield caused by large step differences between lenses.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: 0.7＜L/ImgH＜1.3, wherein L is the maximum height of the lens barrel along the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the imaging system component.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: 1.0＜(T23+T34)/EP23＜3.0, wherein T23 is the air spacing between the second lens and the third lens on the optical axis, T34 is the air spacing between the third lens and the fourth lens on the optical axis, and EP23 is the spacing distance between the second spacer and the third spacer along the optical axis.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: (T12+T45)/(CP1+CP4)≤3.0, wherein T12 is the air spacing between the first lens and the second lens on the optical axis, T45 is the air spacing between the fourth lens and the fifth lens on the optical axis, CP1 is the maximum thickness of the first spacer along the optical axis, and CP4 is the maximum thickness of the fourth spacer along the optical axis.

An imaging system component according to an exemplary embodiment of the present application includes a lens barrel, a lens group and a plurality of spacers arranged in the lens barrel. The lens group includes: a first lens, a second lens, a third lens, a fourth lens and a fifth lens in order from the object side to the image side along the optical axis; the plurality of spacers may include a first spacer, a second spacer, a third spacer and a fourth spacer, wherein the first spacer is placed between the first lens and the second lens and contacts the image side surface of the first lens; the second spacer is placed between the second lens and the third lens and contacts the image side surface of the second lens; the third spacer is placed between the third lens and the fourth lens and contacts the image side surface of the third lens; the fourth spacer is placed between the fourth lens and the fifth lens and contacts the image side surface of the fourth lens. The imaging system component satisfies 0.7＜L/ImgH＜1.3, 1.0＜(T23+T34)/EP23＜3.0 and (T12+T45)/(CP1+CP4)≤3.0, wherein L is the maximum height of the lens barrel along the optical axis, ImgH is half of the diagonal length of the effective pixel area on the imaging plane of the imaging system component, T23 is the air gap between the second lens and the third lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, EP23 is the spacing distance between the second spacer and the third spacer along the optical axis, T12 is the air gap between the first lens and the second lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, CP1 is the maximum thickness of the first spacer along the optical axis, and CP4 is the maximum thickness of the fourth spacer along the optical axis. The application reasonably controls the maximum height of the lens barrel, the spacing distance of each lens, the thickness of the first spacer and the fourth spacer, and the spacing distance of the second spacer and the third spacer along the optical axis direction, and designs the air gap between each lens as a compact type, which can effectively shorten the lens length, is conducive to realizing miniaturization design, and matches more application scenarios. At the same time, by controlling the lens barrel height and the imaging image height ratio, it is beneficial to ensure the performance and appearance of the imaging system component, and ensure that the imaging system component is matched with the chip during design. Under the condition of the wall thickness of the lens barrel, the larger the image height of the imaging system component, that is, the larger the ImgH, the larger the outer diameter of the rear end face of the lens barrel, the larger the light transmission space, and the higher the imaging quality of the imaging system component.

According to the imaging system assembly of the exemplary embodiment of the present application, the effective diameter length difference of the first four lenses is small, so that there is no obvious step difference in the structure, and the assembly is arranged in a trapezoidal shape, the structural stability is better, and the MTF yield is higher. The entire lens has a large step difference between the fourth lens and the fifth lens. By increasing the lens length or adding metal spacers, the stability of the entire system is better. By controlling the height of the lens barrel, the combination of the parameters of the lens and the spacer, the lens is designed to be ultra-thin as a whole, achieving the original intention of the design.

In the pursuit of miniaturization, the existing five-piece optical imaging lens has an unreasonable design of the air space between each lens, resulting in a finished product yield of about 40%. The present application has found through a large number of experimental studies that the finished product yield can be significantly improved when 0.7＜L/ImgH＜1.3, 1.0＜(T23+T34)/EP23＜3.0 and (T12+T45)/(CP1+CP4)≤3.0 are met. Exemplarily, Table 1a shows the yield of an imaging system component according to the present application, which satisfies 0.7＜L/ImgH＜1.3 and 1.0＜(T23+T34)/EP23＜3.0, but does not satisfy (T12+T45)/(CP1+CP4)≤3.0. The yields of the seven groups of imaging system components in Table 1a are all above 41%, and the average yield of these seven groups of samples is as high as about 50.58%. Table 1b shows the yield rate of another imaging system component according to the present application, which satisfies 0.7＜L/ImgH＜1.3, 1.0＜(T23+T34)/EP23＜3.0 and (T12+T45)/(CP1+CP4)≤3.0. The yield rates of the eight imaging system components in Table 1b are all above 47%, and the average yield rate of these eight groups of samples is as high as about 60.52%. It can be seen that the present application reasonably controls the maximum height of the lens barrel, the spacing distance of each lens, the thickness of the first spacer and the fourth spacer, and the spacing distance of the second spacer and the third spacer along the optical axis, and designs the air gap between each lens in a compact manner, thereby achieving system miniaturization while ensuring assembly stability, thereby improving the yield rate of the imaging system component.

Test samples Number of tests Number of qualified Yield Sample 1 613 254 41.47% Sample 2 735 414 56.26% Sample 3 1485 633 42.59% Sample 4 735 379 51.50% Sample 5 1378 952 69.07% Sample 6 1310 589 44.98% Sample 7 1425 665 46.67% total 7680 3884 50.58%

Table 1a

Table 1b

In an exemplary embodiment, the imaging system component according to the present application can satisfy: -0.7＜f/R2＜-0.4 and -0.5＜(d1m-d2s)/f1＜0.5, wherein f is the effective focal length of the imaging system component, R2 is the radius of curvature of the image side of the first lens, d1m is the inner diameter of the image side of the first spacer, d2s is the inner diameter of the object side of the second spacer, and f1 is the effective focal length of the first lens. -0.7＜f/R2＜-0.4 and -0.5＜(d1m-d2s)/f1＜0.5 are satisfied. By reasonably controlling the ratio of the effective focal length of the imaging system component to the radius of curvature of the image side of the first lens within a certain range, the deflection angle of the edge field of view in the lens can be controlled, and the sensitivity of the system can be effectively reduced. At the same time, in combination with the inner diameter parameters of the first spacer and the second spacer, the light incident on the mechanism part of the third lens is well controlled, reducing the generation of stray light reflected within the lens, so as to obtain better imaging quality.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: -4.0＜f2×N2/(d2s+d2m)＜-2.5, wherein f2 is the effective focal length of the second lens, N2 is the refractive index of the second lens, d2s is the inner diameter of the object side of the second spacer, and d2m is the inner diameter of the image side of the second spacer. When -4.0＜f2×N2/(d2s+d2m)＜-2.5 is satisfied, the second lens uses a high refractive index material, which is equivalent to a double-glued structure, which is beneficial for effectively correcting the magnification chromatic aberration of the off-axis field of view, and making the light refraction angle larger, so that the image height is better matched with the chip, and the imaging is clearer.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: 0.0＜(CP2×CT2)/(CP1×CT1)＜0.5, wherein CP1 is the maximum thickness of the first spacer along the optical axis, CP2 is the maximum thickness of the second spacer along the optical axis, CT1 is the center thickness of the first lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis. Satisfying 0.0＜(CP2×CT2)/(CP1×CT1)＜0.5, by controlling the center thickness and edge thickness of the first lens and the second lens on the optical axis, the first lens and the second lens are minimized as much as possible, satisfying the miniaturization feature. At the same time, by constraining the above conditional expression, the outer diameter of the lens is also smaller, the corresponding head size of the lens barrel is also smaller, and the mobile phone is more beautiful.

In an exemplary embodiment, the imaging system component according to the present application can meet the following conditions: 4.0＜T23×EP12/(T12×EP01)＜9.0, wherein EP01 is the distance between the object side end face of the lens barrel and the object side face of the first spacer, EP12 is the distance between the first spacer and the second spacer along the optical axis, T12 is the air distance between the first lens and the second lens on the optical axis, and T23 is the air distance between the second lens and the third lens on the optical axis. Among them, EP01 needs to take into account the thickness of the lens barrel molding while meeting the miniaturization of the lens; the spacing of the lenses can be controlled by controlling the thickness of the spacer, which is convenient for adjusting the MTF field curvature and improving the yield of the model; the present application optimizes the air gap according to the optical system to optimize the imaging system; 4.0＜T23×EP12/(T12×EP01)＜9.0 is met, and by controlling the wall thickness of the front end of the lens barrel and the air spacing of the first three lenses, the lens structure is arranged more compactly and the stability is better while meeting the optical requirements of the imaging system component.

In an exemplary embodiment, the object side surface of the third lens of the imaging system component of the present application has at least one inflection point, and the image side surface of the third lens has at least one inflection point. The imaging system component of the present application can satisfy: 0.5＜EP23/CT3＜1.2, wherein CT3 is the center thickness of the third lens on the optical axis, and EP23 is the spacing distance between the second spacer and the third spacer along the optical axis. Satisfying 0.5＜EP23/CT3＜1.2 helps to control the thickness of the second lens and the third lens near the edge, and further helps to control the ratio of the edge thickness of the second lens and the third lens to the middle thickness of the second lens and the third lens from being too large, thereby ensuring the molding of the second lens and the third lens. At the same time, it can avoid the problem of increasing the internal reflection path of the lens due to the excessive edge thickness of the lens, which is not conducive to the improvement and improvement of the lens shooting effect, that is, it is conducive to meeting the need to improve the stray light of the imaging system component.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: 0.0＜d3s/R6-d2m/R5＜0.5, wherein R5 is the radius of curvature of the object side surface of the third lens, R6 is the radius of curvature of the image side surface of the third lens, d2m is the inner diameter of the image side surface of the second spacer, and d3s is the inner diameter of the object side surface of the third spacer. Satisfying 0.0＜d3s/R6-d2m/R5＜0.5 helps to reduce the generation of spherical aberration and astigmatism by controlling the radius of curvature of the third lens.

In an exemplary embodiment, the imaging system assembly according to the present application may satisfy: 1.2＜CT4/EP34＜2.1, wherein CT4 is the center thickness of the fourth lens on the optical axis, and EP34 is the spacing distance between the third spacer and the fourth spacer along the optical axis. When 1.2＜CT4/EP34＜2.1 is satisfied, the shapes of the third lens and the fourth lens are controlled to meet a reasonable range of processability while correcting the off-axis arc astigmatism.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: -10.0＜D3m/R7+D4s/R8＜-5.0, wherein D3m is the outer diameter of the image side surface of the third spacer, D4s is the outer diameter of the object side surface of the fourth spacer, R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. -10.0＜D3m/R7+D4s/R8＜-5.0 is satisfied, and the outer diameters of the third spacer and the fourth spacer are designed to be minimized, satisfying the outer diameter to thickness ratio, so that the imaging system component satisfies the miniaturized design and the lens is also thinner.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: -1.0＜(f4×N4×CP3)/(f5×N5×CP4)＜0.0, wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, N4 is the refractive index of the fourth lens, N5 is the refractive index of the fifth lens, CP3 is the maximum thickness of the third spacer along the optical axis, and CP4 is the maximum thickness of the fourth spacer along the optical axis. There is a certain large step difference between the fourth lens and the fifth lens, satisfying -1.0＜(f4×N4×CP3)/(f5×N5×CP4)＜0.0, and the thickness of the fourth spacer, the focal length and refractive index of the fourth lens and the fifth lens are reasonably designed. By setting the fourth spacer as a thick spacer or by the lens lengthening method of the fourth lens and the fifth lens, while taking into account stray light, the assembly of the imaging system component is made more stable, which is of great help to improve the MTF and field curvature, and ensures the imaging stability of the imaging system component.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: 1.0＜(d4s+d3m)/f45＜1.8, wherein d4s is the inner diameter of the object side of the fourth spacer, d3m is the inner diameter of the image side of the third spacer, and f45 is the combined focal length of the fourth lens and the fifth lens. Satisfying 1.0＜(d4s+d3m)/f45＜1.8 constrains the inner diameters of the third spacer and the fourth spacer and the combined focal length of the fourth lens and the fifth lens, which is conducive to more convergence of light from the fourth lens, and is combined with the fifth lens to meet the imaging needs of the image plane.

In an exemplary embodiment, the imaging system component according to the present application may satisfy: 0.0＜(D3s-D2m)/f34＜1.1, wherein D3s is the outer diameter of the object side of the third spacer, D2m is the outer diameter of the image side of the second spacer, and f34 is the combined focal length of the third lens and the fourth lens. Satisfying 0.0＜(D3s-D2m)/f34＜1.1 constrains the outer diameters of the third spacer and the second spacer and the combined focal length of the third lens and the fourth lens, and while satisfying the imaging requirements, the outer diameters of the second spacer and the third spacer are designed to be minimized, so that the imaging system component satisfies the miniaturized design; the smaller the combined focal length of the third lens and the fourth lens, the smaller the distance between the lenses, and the thinner the lens.

In example embodiments, the first lens may have positive power, the second lens may have negative power, the third lens may have positive power or negative power, the fourth lens may have positive power, and the fifth lens may have positive power.

In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the fifth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side and image side of all lenses from the first lens to the fifth lens are aspherical mirror surfaces.

In an exemplary embodiment, the imaging system component may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.

The imaging system assembly according to the above-mentioned embodiment of the present application may adopt multiple lenses, such as the five lenses mentioned above. By reasonably allocating the optical power, surface shape and arrangement of each spacer of each lens, the span of each gear of the lens and the lens barrel is made more uniform, the ability of light convergence is enhanced, and the imaging quality of the ultra-thin, large image surface and miniaturized imaging system assembly is improved. However, it should be understood by those skilled in the art that the number of lenses constituting the imaging system assembly can be changed without departing from the technical solution claimed for protection in this application to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiment, the imaging system assembly is not limited to including five lenses. If necessary, the imaging system assembly may also include other numbers of lenses.

The following further describes specific embodiments of imaging system components applicable to the above-mentioned embodiments with reference to the accompanying drawings. Specifically, the imaging system components according to embodiments 1 and 2 of the present application are described with reference to FIGS. 2A to 3D; the imaging system components according to embodiments 3 and 4 of the present application are described with reference to FIGS. 4A to 5D; the imaging system components according to embodiments 5 and 6 of the present application are described with reference to FIGS. 6A to 7D; and the imaging system components according to embodiments 7 and 8 of the present application are described with reference to FIGS. 8A to 9D.

Example 1

Fig. 2A shows a schematic structural diagram of an imaging system assembly according to Embodiment 1 of the present application. As shown in Fig. 2A, the imaging system assembly of Embodiment 1 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers.

As shown in FIG2A , the lens group of the imaging system assembly of Example 1 includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through each surface S1 to S10 and is finally imaged on an imaging surface (not shown).

Table 1c shows the basic parameter table of the lens group of the imaging system assembly of Example 1, wherein the units of the curvature radius, thickness and effective focal length are all millimeters (mm).

Table 1c

In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1c above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Tables 2-1 and 2-2 give the high-order coefficients A 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 that can} be used for each aspheric mirror surface S1-S10 in Example ₁ .

Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.6341E-02 -5.5509E-03 -6.5814E-04 -1.0183E-04 -2.8091E-05 -2.4515E-06 -5.2939E-06 S2 -8.1977E-02 1.4004E-04 7.2166E-04 -5.0253E-04 1.7723E-04 4.9414E-05 2.6817E-05 S3 -1.8473E-02 3.9809E-03 1.7489E-03 -6.1421E-04 -2.9335E-05 1.0069E-04 -1.8027E-05 S4 -5.5025E-03 5.2777E-04 4.0267E-04 4.1960E-04 -3.0628E-04 1.3717E-04 -3.3994E-05 S5 -1.7915E-01 1.0481E-02 -7.7049E-04 1.4347E-03 -1.0668E-04 1.7344E-05 -9.2984E-05 S6 -3.0031E-01 -1.5428E-02 -7.3602E-03 1.9805E-03 2.4169E-04 4.2245E-04 1.6031E-07 S7 -8.6642E-02 -5.0145E-03 -3.2902E-03 4.7883E-03 -6.8496E-05 5.1598E-04 5.6077E-05 S8 3.4832E-01 2.5317E-02 3.6778E-02 -2.7065E-03 -1.2795E-04 -1.2147E-03 1.5853E-03 S9 -1.4754E+00 -1.1726E-02 -5.4256E-02 -1.7173E-02 -1.0917E-02 -2.3618E-03 -8.6328E-04 S10 -4.0463E+00 5.3647E-01 -2.1088E-01 5.0363E-02 -3.6495E-02 1.2350E-02 -6.2047E-03

Table 2-1

Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 -3.6547E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.1622E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.0046E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 3.5510E-05 1.2561E-05 -2.8846E-05 -1.4064E-05 0.0000E+00 0.0000E+00 0.0000E+00 S7 6.8544E-05 -2.7138E-04 -1.4814E-04 -1.8682E-04 1.4089E-05 -6.4594E-06 5.9686E-05 S8 -5.4047E-04 -8.0544E-04 -1.1344E-03 -3.6010E-04 -1.7722E-04 1.0696E-04 -5.0995E-05 S9 -8.0554E-04 2.9050E-04 2.6614E-04 4.5346E-04 2.1448E-04 6.6742E-06 -1.3557E-04 S10 5.4841E-03 1.7612E-03 4.1287E-03 2.0106E-03 1.3009E-03 3.7859E-04 2.7240E-04

Table 2-2

Table 3 shows the effective focal length f of the imaging system component of this embodiment, the combined focal length f34 of the third lens and the fourth lens, the combined focal length f45 of the fourth lens and the fifth lens, and the value of half the diagonal length ImgH of the effective pixel area on the imaging plane of the imaging system component.

parameter f(mm) f34(mm) f45(mm) ImgH(mm) Numeric 2.18 1.56 3.07 2.55

Table 3

As shown in FIG2A , the imaging system assembly of Example 1 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 4 shows a basic parameter table of the spacers of the imaging system assembly of Example 1, and the units of each parameter in Table 4 are all millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

parameter d1m d2s d2m D2m d3s d3m D3s d4s EP01 EP12 Numeric 1.783 1.689 1.689 2.658 2.193 2.277 2.751 2.526 0.491 0.238 parameter EP23 EP34 CP1 CP2 CP3 CP4 L D3m D4s Numeric 0.175 0.338 0.233 0.022 0.152 0.429 2.985 2.721 3.965

Table 4

Example 2

Fig. 2B shows a schematic diagram of the structure of the imaging system components according to Embodiment 2 of the present application. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted.

As shown in Fig. 2B, the imaging system assembly of Example 2 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers. The lens group of the imaging system assembly of Example 2 is exactly the same as the lens group of the imaging system assembly of Example 1, and its basic parameters are detailed in Tables 1c to 3, which will not be repeated here.

As shown in FIG2B , the imaging system assembly of Example 2 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 5 shows a basic parameter table of the spacers of the imaging system assembly of Example 2, and the units of each parameter in Table 5 are millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

parameter d1m d2s d2m D2m d3s d3m D3s d4s EP01 EP12 Numeric 1.783 1.669 1.669 2.852 1.989 1.989 3.122 2.466 0.491 0.238 parameter EP23 EP34 CP1 CP2 CP3 CP4 L D3m D4s Numeric 0.256 0.386 0.263 0.022 0.022 0.429 2.985 3.122 3.560

Table 5

Fig. 3A shows the on-axis chromatic aberration curve of the imaging system components of Example 1 and Example 2, which indicates the deviation of light rays of different wavelengths from the convergence point after passing through the lens. Fig. 3B shows the astigmatism curve of the imaging system components of Example 1 and Example 2, which indicates the meridional image curvature and the sagittal image curvature. Fig. 3C shows the distortion curve of the imaging system components of Example 1 and Example 2, which indicates the distortion magnitude values corresponding to different image heights. Fig. 3D shows the magnification chromatic aberration curve of the imaging system components of Example 1 and Example 2, which indicates the deviation of light rays at different image heights on the imaging plane after passing through the lens. It can be seen from Figs. 3A to 3D that the imaging system components of Example 1 and Example 2 can achieve good imaging quality.

Example 3

Fig. 4A shows a schematic structural diagram of an imaging system assembly according to Embodiment 3 of the present application. As shown in Fig. 4A, the imaging system assembly of Embodiment 3 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers.

As shown in FIG4A , the lens group of the imaging system assembly of Example 3 includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. Light from the object passes through each surface S1 to S10 in sequence and is finally imaged on an imaging surface (not shown).

Table 6 shows the basic parameter table of the lens group of the imaging system component of Example 3, wherein the units of the radius of curvature, thickness and effective focal length are all millimeters (mm). Tables 7-1 and 7-2 show the high-order coefficients A 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 that can be used for each aspheric mirror _{surface S1 - S10} in Example 3, wherein the surface type of each aspheric surface can be defined by the formula (1) given in the above-mentioned Example 1.

Table 6

Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.8802E-02 -2.7617E-03 -2.0283E-04 -6.0071E-05 -6.4068E-06 -2.3165E-05 1.7248E-05 S2 -7.1195E-02 1.5301E-03 -6.7151E-05 3.2572E-05 -8.8024E-05 -1.5486E-05 -2.5057E-05 S3 -1.9773E-02 3.4113E-03 8.6896E-04 -1.3101E-04 -1.0606E-04 -2.8059E-05 3.9436E-05 S4 2.4841E-04 3.5403E-04 1.1010E-04 3.1641E-04 -2.3653E-04 4.1730E-05 -9.7777E-06 S5 -1.6606E-01 8.7164E-03 -2.1275E-03 1.1822E-03 -2.4461E-04 6.0562E-05 -9.6950E-05 S6 -3.1252E-01 -8.7860E-03 -8.3470E-03 2.3483E-03 7.9313E-04 7.6168E-04 1.5191E-04 S7 -9.9362E-02 -9.3920E-03 -3.9818E-03 2.3559E-03 2.1245E-03 8.8290E-04 9.0392E-05 S8 3.1872E-01 1.9352E-02 2.2079E-02 -4.5476E-03 1.8954E-04 -4.7845E-04 6.8058E-04 S9 -1.6767E+00 1.4046E-01 -6.9822E-02 1.7514E-02 -1.3289E-02 -1.5466E-03 -5.3302E-03 S10 -4.7849E+00 9.1687E-01 -3.3014E-01 1.3610E-01 -5.7813E-02 3.3641E-02 -1.5478E-02

Table 7-1

Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 3.8019E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 9.2785E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 2.2736E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 3.5510E-05 1.2561E-05 -2.8846E-05 -1.4064E-05 0.0000E+00 0.0000E+00 0.0000E+00 S7 -4.0357E-04 -4.5390E-04 -2.2860E-04 -1.5581E-04 1.4089E-05 -6.4594E-06 5.9686E-05 S8 -1.0195E-03 -4.6250E-04 -3.4676E-04 2.3053E-04 1.5613E-04 1.2589E-04 -5.0995E-05 S9 -1.4045E-03 8.1962E-05 2.8898E-04 3.9279E-04 -3.6873E-04 6.6742E-06 -1.3557E-04 S10 8.4543E-03 -5.2299E-03 2.6530E-03 -1.7328E-03 7.7922E-04 -4.3995E-04 2.7240E-04

Table 7-2

Table 8 shows the effective focal length f of the imaging system component of this embodiment, the combined focal length f34 of the third lens and the fourth lens, the combined focal length f45 of the fourth lens and the fifth lens, and the value of half the diagonal length ImgH of the effective pixel area on the imaging plane of the imaging system component.

parameter f(mm) f34(mm) f45(mm) ImgH(mm) Numeric 2.46 1.57 3.78 2.67

Table 8

As shown in FIG4A , the imaging system assembly of Example 3 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 9 shows a basic parameter table of the spacers of the imaging system assembly of Example 3, and the units of each parameter in Table 9 are all millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

parameter d1m d2s d2m D2m d3s d3m D3s d4s EP01 EP12 Numeric 2.063 1.589 1.589 2.938 1.965 1.965 3.202 2.807 0.491 0.308 parameter EP23 EP34 CP1 CP2 CP3 CP4 L D3m D4s Numeric 0.261 0.316 0.263 0.018 0.022 0.362 3.188 3.202 4.246

Table 9

Example 4

FIG4B shows a schematic diagram of the structure of an imaging system assembly according to Example 4 of the present application. As shown in FIG4B , the imaging system assembly of Example 4 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers. The lens group of the imaging system assembly of Example 4 is exactly the same as the lens group of the imaging system assembly of Example 3, and its basic parameters are detailed in Tables 6 to 8, which will not be described in detail.

As shown in FIG4B , the imaging system assembly of Example 4 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 10 shows a basic parameter table of the spacers of the imaging system assembly of Example 4, and the units of each parameter in Table 10 are all millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

Table 10

Fig. 5A shows the on-axis chromatic aberration curve of the imaging system components of Example 3 and Example 4, which indicates the deviation of light rays of different wavelengths from the convergence point after passing through the lens. Fig. 5B shows the astigmatism curve of the imaging system components of Example 3 and Example 4, which indicates the meridional image curvature and the sagittal image curvature. Fig. 5C shows the distortion curve of the imaging system components of Example 3 and Example 4, which indicates the distortion magnitude values corresponding to different image heights. Fig. 5D shows the magnification chromatic aberration curve of the imaging system components of Example 3 and Example 4, which indicates the deviation of light rays at different image heights on the imaging plane after passing through the lens. It can be seen from Figs. 5A to 5D that the imaging system components of Example 3 and Example 4 can achieve good imaging quality.

Example 5

Fig. 6A shows a schematic structural diagram of an imaging system assembly according to Embodiment 5 of the present application. As shown in Fig. 6A, the imaging system assembly of Embodiment 5 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers.

As shown in FIG6A , the lens group of the imaging system assembly of Example 5 includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. Light from the object passes through each surface S1 to S10 in sequence and is finally imaged on an imaging surface (not shown).

Table 11 shows the basic parameter table of the lens group of the imaging system component of Example 5, wherein the units of the radius of curvature, thickness and effective focal length are all millimeters (mm). Tables 12-1 and 12-2 show the high-order coefficients A 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 that} can be used for each aspheric mirror surface _{S1 - S10} in Example 5, wherein the surface type of each aspheric surface can be defined by the formula (1) given in the above-mentioned Example 1.

Table 11

Face number A4 A6 A8 A10 A12 A14 A16 S1 -3.6258E-02 -6.3963E-03 -8.0239E-04 -7.9512E-05 1.5029E-05 2.9341E-05 1.3736E-05 S2 -9.2047E-02 -2.2831E-03 4.7529E-04 -5.9359E-04 9.9431E-05 3.4891E-06 1.2708E-05 S3 -1.8727E-02 3.9732E-03 2.0107E-03 -5.1136E-04 -6.9445E-05 3.4959E-05 -1.3297E-05 S4 -3.9491E-03 3.5595E-04 4.7234E-04 5.7728E-04 -2.4599E-04 4.4543E-05 -1.4033E-05 S5 -1.7401E-01 9.4865E-03 1.5729E-04 1.5536E-03 -6.5532E-06 9.5036E-05 -1.0368E-04 S6 -2.7805E-01 -1.3284E-02 -7.9767E-03 7.8494E-04 -2.9919E-06 3.7921E-04 1.8680E-05 S7 -6.2168E-02 -1.1473E-02 -9.0669E-03 2.9774E-03 1.0658E-04 5.1074E-04 1.2500E-04 S8 2.4111E-01 -2.0827E-03 1.9228E-02 1.3341E-03 5.7567E-04 -7.8745E-04 2.0253E-05 S9 -1.1461E+00 -4.1484E-02 -3.2138E-02 -8.6053E-03 -6.4242E-03 -1.7620E-03 -8.2872E-04 S10 -3.2278E+00 4.9175E-01 -1.4563E-01 5.2322E-02 -1.8811E-02 1.1893E-02 -3.0928E-03

Table 12-1

Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 6.7395E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 -1.6392E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 1.8299E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 1.7099E-05 2.8904E-05 -4.3698E-06 -6.5333E-06 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 -1.4043E-04 -2.3165E-04 -2.0546E-05 2.1815E-05 2.2198E-04 3.0974E-05 -4.0025E-06 S10 2.8256E-03 -1.0822E-04 1.3624E-03 4.9995E-05 -9.4329E-05 -5.0232E-05 5.6115E-06

Table 12-2

Table 13 shows the effective focal length f of the imaging system component of this embodiment, the combined focal length f34 of the third lens and the fourth lens, the combined focal length f45 of the fourth lens and the fifth lens, and the value of half the diagonal length ImgH of the effective pixel area on the imaging plane of the imaging system component.

parameter f(mm) f34(mm) f45(mm) ImgH(mm) Numeric 2.16 1.59 2.93 2.65

Table 13

As shown in FIG6A , the imaging system assembly of Example 5 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 14 shows a basic parameter table of the spacers of the imaging system assembly of Example 5, and the units of each parameter in Table 14 are all millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

parameter d1m d2s d2m D2m d3s d3m D3s d4s EP01 EP12 Numeric 2.060 1.641 1.641 2.990 1.986 1.986 3.254 2.856 0.491 0.311 parameter EP23 EP34 CP1 CP2 CP3 CP4 L D3m D4s Numeric 0.332 0.277 0.215 0.018 0.022 0.275 3.086 3.254 4.297

Table 14

Example 6

FIG6B shows a schematic diagram of the structure of an imaging system assembly according to Example 6 of the present application. As shown in FIG6B , the imaging system assembly of Example 6 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers. The lens group of the imaging system assembly of Example 6 is exactly the same as the lens group of the imaging system assembly of Example 5, and its basic parameters are detailed in Tables 11 to 13, which will not be described in detail.

As shown in FIG6B , the imaging system assembly of Example 6 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 15 shows a basic parameter table of the spacers of the imaging system assembly of Example 6, and the units of each parameter in Table 15 are all millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

parameter d1m d2s d2m D2m d3s d3m D3s d4s EP01 EP12 Numeric 2.203 1.648 1.648 3.133 2.007 2.007 3.397 3.001 0.491 0.279 parameter EP23 EP34 CP1 CP2 CP3 CP4 L D3m D4s Numeric 0.361 0.277 0.215 0.018 0.022 0.275 3.343 3.397 4.441

Table 15

FIG7A shows the on-axis chromatic aberration curve of the imaging system components of Example 5 and Example 6, which indicates the deviation of light rays of different wavelengths from the convergence point after passing through the lens. FIG7B shows the astigmatism curve of the imaging system components of Example 5 and Example 6, which indicates the meridional image curvature and the sagittal image curvature. FIG7C shows the distortion curve of the imaging system components of Example 5 and Example 6, which indicates the distortion magnitude values corresponding to different image heights. FIG7D shows the magnification chromatic aberration curve of the imaging system components of Example 5 and Example 6, which indicates the deviation of light rays at different image heights on the imaging plane after passing through the lens. It can be seen from FIG7A to FIG7D that the imaging system components of Example 5 and Example 6 can achieve good imaging quality.

Example 7

Fig. 8A shows a schematic structural diagram of an imaging system assembly according to Embodiment 7 of the present application. As shown in Fig. 8A, the imaging system assembly of Embodiment 7 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers.

As shown in FIG8A , the lens group of the imaging system assembly of Example 7 includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through each surface S1 to S10 and is finally imaged on an imaging surface (not shown).

Table 16 shows a basic parameter table of the lens group of the imaging system assembly of Example 7, wherein the units of the radius of curvature, thickness and effective focal length are all millimeters (mm). Tables 17-1 and 17-2 show the high-order coefficients A 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 that} can be used for each aspheric mirror surface _{S1 - S10} in Example ₇ , wherein the surface shape of each aspheric surface can be defined by the formula (1) given in the above-mentioned Example 1.

Table 16

Table 17-1

Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 4.5276E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 1.2935E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 2.0801E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 3.5535E-05 2.3459E-05 -1.8365E-05 -1.1167E-05 0.0000E+00 0.0000E+00 0.0000E+00 S7 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S9 9.4741E-04 1.4308E-03 9.8481E-04 1.0947E-03 6.0311E-04 9.4741E-05 -3.1142E-05 S10 2.3884E-03 -2.4758E-03 1.1281E-03 -5.5049E-04 1.1303E-04 4.0310E-04 9.5788E-05

Table 17-2

Table 18 shows the effective focal length f of the imaging system component of this embodiment, the combined focal length f34 of the third lens and the fourth lens, the combined focal length f45 of the fourth lens and the fifth lens, and the numerical value ImgH of half the diagonal length of the effective pixel area on the imaging plane of the imaging system component.

parameter f(mm) f34(mm) f45(mm) ImgH(mm) Numeric 2.39 1.56 3.85 4.00

Table 18

As shown in FIG8A , the imaging system assembly of Example 7 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 19 shows a basic parameter table of the spacers of the imaging system assembly of Example 7, and the units of each parameter in Table 19 are all millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

parameter d1m d2s d2m D2m d3s d3m D3s d4s EP01 EP12 Numeric 2.060 1.641 1.641 3.419 1.929 1.929 4.703 2.572 0.491 0.461 parameter EP23 EP34 CP1 CP2 CP3 CP4 L D3m D4s Numeric 0.252 0.513 0.215 0.018 0.018 0.018 3.089 4.703 5.935

Table 19

Example 8

FIG8B shows a schematic diagram of the structure of an imaging system assembly according to Example 8 of the present application. As shown in FIG8B , the imaging system assembly of Example 8 includes a lens barrel P0, lens groups E1 to E5, and a plurality of spacers. The lens group of the imaging system assembly of Example 8 is exactly the same as the lens group of the imaging system assembly of Example 7, and its basic parameters are detailed in Tables 16 to 18, which will not be described in detail.

As shown in FIG8B , the imaging system assembly of Example 8 further includes four spacers, namely a first spacer P1, a second spacer P2, a third spacer P3 and a fourth spacer P4. The first spacer P1 is placed on the image side of the first lens and is in at least partial contact with the image side surface of the first lens; the second spacer P2 is placed on the image side of the second lens and is in at least partial contact with the image side surface of the second lens; the third spacer P3 is placed on the image side of the third lens and is in at least partial contact with the image side surface of the third lens; the fourth spacer P4 is placed on the image side of the fourth lens and is in at least partial contact with the image side surface of the fourth lens. Table 20 shows a basic parameter table of the spacers of the imaging system assembly of Example 8, and the units of each parameter in Table 20 are all millimeters (mm). The above-mentioned spacers can block the entry of excess external light, enable the lens and the lens barrel to better support each other, and enhance the structural stability of the imaging system assembly.

parameter d1m d2s d2m D2m d3s d3m D3s d4s EP01 EP12 Numeric 1.390 1.659 1.659 3.501 1.969 1.969 4.784 2.589 0.620 0.476 parameter EP23 EP34 CP1 CP2 CP3 CP4 L D3m D4s Numeric 0.302 0.463 0.022 0.018 0.018 0.018 3.345 4.784 6.016

Table 20

FIG9A shows the on-axis chromatic aberration curve of the imaging system components of Example 7 and Example 8, which indicates the deviation of light rays of different wavelengths from the convergence point after passing through the lens. FIG9B shows the astigmatism curve of the imaging system components of Example 7 and Example 8, which indicates the meridional image curvature and the sagittal image curvature. FIG9C shows the distortion curve of the imaging system components of Example 7 and Example 8, which indicates the distortion magnitude values corresponding to different image heights. FIG9D shows the magnification chromatic aberration curve of the imaging system components of Example 7 and Example 8, which indicates the deviation of light rays at different image heights on the imaging plane after passing through the lens. It can be seen from FIG9A to FIG9D that the imaging system components of Example 7 and Example 8 can achieve good imaging quality.

In summary, the imaging system components of Examples 1 to 8 satisfy the relationship shown in Table 21.

Table 21

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

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

Claims (10)

1. An imaging system assembly, comprising:

the lens assembly sequentially comprises, from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens;

the plurality of spacers includes:

a first spacer disposed between the first lens and the second lens and in contact with an image side surface of the first lens;

a second spacer disposed between the second lens and the third lens and in contact with an image side surface of the second lens;

a third spacer disposed between the third lens and the fourth lens and in contact with an image side surface of the third lens; and

A fourth spacer disposed between the fourth lens and the fifth lens and in contact with an image side surface of the fourth lens;

a lens barrel for accommodating the lens group and the plurality of spacers;

wherein,,

the maximum height L of the lens barrel along the optical axis direction and half of the diagonal length of the effective pixel area on the imaging surface of the imaging system component satisfy the following conditions: L/ImgH is more than 0.7 and less than 1.3;

an air interval T23 of the second lens and the third lens on the optical axis, an air interval T34 of the third lens and the fourth lens on the optical axis, and a spacing distance EP23 of the second spacer and the third spacer along the optical axis direction satisfy: 1.0 < (T23+T34)/EP 23 < 3.0; and

an air interval T12 of the first lens and the second lens on the optical axis, an air interval T45 of the fourth lens and the fifth lens on the optical axis, a maximum thickness CP1 of the first spacer in the optical axis direction, and a maximum thickness CP4 of the fourth spacer in the optical axis direction satisfy: (T12+T45)/(CP1+CP4) is less than or equal to 3.0.

2. The imaging system assembly of claim 1, wherein an effective focal length f of the imaging system assembly, a radius of curvature R2 of an image side of the first lens, an inner diameter d1m of an image side of the first spacer, an inner diameter d2s of an object side of the second spacer, and an effective focal length f1 of the first lens satisfy:

-0.7 < f/R2 < -0.4 and-0.5 < - (d 1m-d2 s)/f 1 < 0.5.

3. The imaging system assembly of claim 1, wherein an effective focal length f2 of the second lens, a refractive index N2 of the second lens, an inner diameter d2s of an object-side surface of the second spacer, and an inner diameter d2m of an image-side surface of the second spacer satisfy: -4.0 < f2×n2/(d2s+d2m) < -2.5.

4. The imaging system assembly of claim 1, wherein a maximum thickness CP1 of the first spacer in the optical axis direction, a maximum thickness CP2 of the second spacer in the optical axis direction, a center thickness CT1 of the first lens on the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy:

0.0＜(CP2×CT2)/(CP1×CT1)＜0.5。

5. the imaging system assembly according to claim 1, wherein a separation distance EP01 of an object side end surface of the lens barrel and an object side surface of the first spacer in the optical axis direction, a separation distance EP12 of the first spacer and the second spacer in the optical axis direction, an air separation T12 of the first lens and the second lens on the optical axis, and an air separation T23 of the second lens and the third lens on the optical axis satisfy:

4.0＜T23×EP12/(T12×EP01)＜9.0。

6. The imaging system assembly of claim 1 wherein the object side of the third lens has at least one inflection point, the image side of the third lens has at least one inflection point,

the imaging system component satisfies: 0.5 < EP23/CT3 < 1.2, wherein CT3 is the center thickness of the third lens on the optical axis, and EP23 is the spacing distance between the second spacer and the third spacer along the optical axis direction.

7. The imaging system assembly of any of claims 1 to 6, wherein a radius of curvature R5 of the object-side surface of the third lens, a radius of curvature R6 of the image-side surface of the third lens, an inner diameter d2m of the image-side surface of the second spacer, and an inner diameter d3s of the object-side surface of the third spacer satisfy: d3s/R6-d2m/R5 is more than 0.0 and less than 0.5.

8. The imaging system assembly of any of claims 1 to 6, wherein a center thickness CT4 of the fourth lens on the optical axis, a separation distance EP34 between the third spacer and the fourth spacer in the optical axis direction satisfies: CT4/EP34 < 2.1.

9. The imaging system assembly of any of claims 1 to 6, wherein an outer diameter D3m of an image side of the third spacer, an outer diameter D4s of an object side of the fourth spacer, a radius of curvature R7 of an object side of the fourth lens, and a radius of curvature R8 of an image side of the fourth lens satisfy:

-10.0＜D3m/R7+D4s/R8＜-5.0。

10. The imaging system assembly of any of claims 1 to 6, wherein an effective focal length f4 of the fourth lens, an effective focal length f5 of the fifth lens, a refractive index N4 of the fourth lens, a refractive index N5 of the fifth lens, a maximum thickness CP3 of the third spacer in the optical axis direction, and a maximum thickness CP4 of the fourth spacer in the optical axis direction satisfy: -1.0 < (f4×n4×c3)/(f5×n5×c4) < 0.0.