Optical image capturing system

Abstract

The utility model discloses an optical imaging system, which comprises a lens barrel, a lens group and a spacing element group, wherein the lens group and the spacing element group are accommodated in the lens barrel. The inner ring surface of the lens barrel is step-shaped, and the opening size of the inner ring surface is sequentially reduced from the object side end surface to the image side end surface. The lens group sequentially comprises a first lens with negative focal power and a concave image side surface, a second lens with positive focal power and a convex image side surface, a third lens with positive focal power and a convex surface, a fourth lens with negative focal power and a concave surface, and a fifth lens with negative focal power and a convex surface from the object side to the image side along the optical axis. The fifth lens has positive focal power, and the object side surface of the fifth lens is a convex surface; any two adjacent lenses in the first to fifth lenses are not glued. The spacing element group at least comprises a first spacing element located between the first lens and the second lens and contacted with the image side surface of the first lens. The inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel, the effective focal length f of the optical imaging system, the inner diameter d1s of the object side face of the first spacing element and the center thickness CT1 of the first lens on the optical axis meet 1.50 lt. (d0s-d0m) / flt; 2.50 and 8.50 lt, 2.50 and 8.50 lt; (d0s-d1s) / CT1lt; 12.10, 12.10.

Description

Technical Field

[0001] The present application relates to the field of optical elements, and more specifically, to an optical imaging system. Background Art

[0002] In recent years, the technical level of electronic products has been continuously improved. At the same time, the technology of optical components used in these products has also been continuously improved. For example, for the rapidly developing wearable smart devices, the market has higher and higher requirements for the optical components therein. As the core component, the optical lens, its imaging performance and function are crucial. At present, the application scenarios and usage time of products such as wearable smart devices are becoming more and more extensive, so it is required that the lenses used in them can achieve good imaging functions in different situations, such as the function of using the same optical system for imaging day and night, that is, the visible light band-infrared band can use the same optical system for imaging, and can achieve higher imaging quality. According to the current market demand, it is necessary to provide a large field of view, visible-infrared band confocal optical imaging lens, however, the object side aperture of this type of lens optical system is larger than the image side aperture, the outer diameter of the first lens is larger than the outer diameter of the other lenses, the object side of the first lens is larger than the image side aperture, and the image side mechanism position of the first lens is prone to stray light, which affects the lens performance and imaging quality. Utility Model Content

[0003] On the one hand, the present application provides an optical imaging system, which may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The inner annular surface of the lens barrel is stepped, and the opening size of the lens barrel decreases from the object side end surface to the image side end surface. The lens group includes in sequence from the object side to the image side along the optical axis: a first lens with negative optical focal length, whose image side surface is concave; a second lens with positive optical focal length, whose image side surface is convex; a third lens with positive optical focal length, whose object side surface is convex and image side surface is convex; a fourth lens with negative optical focal length, whose object side surface is concave and image side surface is concave; and a fifth lens with positive optical focal length, whose object side surface is convex; there is an air gap between any two adjacent lenses from the first lens to the fifth lens. The spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens. The optical imaging system may satisfy: 1.50<(d0s-d0m) / f<2.50 and 8.50<(d0s-d1s) / CT1<12.10, wherein d0s is the inner diameter of the object side end surface of the lens barrel, d0m is the inner diameter of the image side end surface of the lens barrel, f is the effective focal length of the optical imaging system, d1s is the inner diameter of the object side surface of the first spacing element, and CT1 is the center thickness of the first lens on the optical axis.

[0004] In one embodiment, the spacer element group also includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; the distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis, the maximum effective radius DT12 of the image side surface of the first lens, and the maximum effective radius DT22 of the image side surface of the second lens may satisfy: 5.80<(EP12 / DT12)×(EP12 / DT22)<8.20.

[0005] In one embodiment, the spacer element group also includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, the effective focal length f3 of the third lens and the curvature radius R6 of the image side surface of the third lens may satisfy: 0.40<(EP23 / T23)×|f3 / R6|<3.10.

[0006] In one embodiment, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the maximum distance L from the object side end surface to the image side end surface of the lens barrel on the optical axis may satisfy: 20<(EP34 / CT4)×(L / f)<22.

[0007] In one embodiment, an outer diameter D1s of the object side surface of the first spacer element, an outer diameter D0m of the image side end surface of the lens barrel, and an entrance pupil diameter EPD of the optical imaging system may satisfy: 1.60<(D1s-D0m) / EPD<3.00.

[0008] In one embodiment, the spacer element group also includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the outer diameter D2s of the object side surface of the second spacer element, the outer diameter D3s of the object side surface of the third spacer element, the inner diameter d3s of the object side surface of the third spacer element, and the inner diameter d2s of the object side surface of the second spacer element may satisfy: -2.00<(D2s-D3s) / (d3s-d2s)<3.20.

[0009] In one embodiment, the spacer element group also includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the inner diameter d4m of the image side surface of the fourth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element and the curvature radius R9 of the object side surface of the fifth lens may satisfy: 2.10<(d4m+d4s) / R9<3.50.

[0010] In one embodiment, the spacer element group also includes a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the outer diameter D4m of the image side surface of the fourth spacer element, the inner diameter d3m of the image side surface of the third spacer element, and the combined focal length f34 of the third lens and the fourth lens may satisfy: 0.10<(D4m-d3m) / f34<0.40.

[0011] In one embodiment, the combined focal length f12 of the first lens and the second lens, the curvature radius R1 of the object side surface of the first lens, and the center thickness CT2 of the second lens on the optical axis may satisfy: 0.10 <f12 / R1×(d1s / CT2)<2.10。

[0012] In one embodiment, the spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the inner diameter d4s of the object side surface of the fourth spacer element, the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the curvature radius R9 of the object side surface of the fifth lens may satisfy: 1.00 <d4s / R8×(D4m / R9)<1.90。

[0013] In one embodiment, the spacer element group further includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis, the axial distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and the air spacing T23 between the second lens and the third lens on the optical axis may satisfy: 0.40 <EP23 / (SAG22+T23)<2.60。

[0014] In one embodiment, the spacer element group further includes a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; the distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis and the axial distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens may satisfy: 0.80 <EP23 / SAG32<4.00。

[0015] In one embodiment, the spacer element group further includes a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; the inner diameter d4s of the object side surface of the fourth spacer element, the axial distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens, and the axial distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the effective radius vertex of the image side surface of the fourth lens may satisfy: 4.50 <d4s / (SAG41+SAG42)<8.70。

[0016] On the other hand, the present application also provides an optical imaging system, which may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The inner ring surface of the lens barrel is stepped, and the opening size of the lens barrel decreases sequentially from the object side end face to the image side end face. The lens group includes, in order from the object side to the image side along the optical axis: a first lens with a negative optical power, whose image side surface is concave; a second lens with a positive optical power, whose image side surface is convex; a third lens with a positive optical power, whose object side surface is convex and image side surface is convex; a fourth lens with a negative optical power, whose object side surface is concave and image side surface is concave; and a fifth lens with a positive optical power, whose object side surface is convex; there is an air gap between any two adjacent lenses among the first lens to the fifth lens. The spacer element group at least includes a first spacer element located between the first lens and the second lens and at least partially contacting the image side surface of the first lens, and a second spacer element located between the second lens and the third lens and at least partially contacting the image side surface of the second lens. The optical imaging system can satisfy: -3.00 < f2 / f1 < -2.00 and 1.10 < (EP12 - EP01) / T12 < 2.20, where f2 is the effective focal length of the second lens, f1 is the effective focal length of the first lens, EP12 is the distance on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, EP01 is the distance on the optical axis from the object side end face of the lens barrel to the object side surface of the first spacer element, and T12 is the air gap on the optical axis between the first lens and the second lens.

[0017] The optical imaging system according to the embodiment of the present application includes a lens barrel and a five-piece lens group and a spacer element group assembled therein. The object side end face of the lens barrel has a maximum opening, the image side end face has a minimum opening, the inner annular surface is stepped, and the opening size of the inner annular surface decreases from the object side end face to the image side end face of the lens barrel. The lens group includes the first to fifth lenses arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has a negative optical focal length, and its image side face is a concave surface; the second lens has a positive optical focal length, and its image side face is a convex surface; the third lens has a positive optical focal length, and its object side face and image side face are both convex surfaces; the fourth lens has a negative optical focal length, and its object side face and image side face are both concave surfaces; the fifth lens has a positive optical focal length, and its object side face is a convex surface; and there is no bonding between any adjacent lenses from the first to the fifth lenses. The spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side face of the first lens. The inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel and the effective focal length f of the optical imaging system satisfy: 1.50<(d0s-d0m) / f<2.50. By the above-mentioned setting of the optical imaging system, the optical imaging system can achieve the technical characteristics of a large field of view; at the same time, the outer diameter of the first lens is larger than that of the other lenses, and the aperture of the object side face of the first lens is larger than that of the image side face, resulting in the image side face mechanism position of the first lens being prone to produce obvious internal reflection stray light. At the same time, the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacing element and the center thickness CT1 of the first lens on the optical axis are controlled to satisfy: 8.50<(d0s-d1s) / CT1<12.10, which can reasonably constrain the aperture of the first spacing element, thereby being able to effectively suppress the above-mentioned stray light.

[0018] On the other hand, the optical imaging system according to an embodiment of the present application includes a lens barrel and a five-lens group and a spacer element group assembled therein. The object-side end face of the lens barrel has a maximum opening, the image-side end face has a minimum opening, the inner ring surface is stepped, and the opening size of the inner ring surface decreases sequentially from the object-side end face to the image-side end face of the lens barrel. The lens group includes first to fifth lenses arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative focal power, and its image side face is concave; the second lens has a positive focal power, and its image side face is convex; the third lens has a positive focal power, and both its object side face and image side face are convex; the fourth lens has a negative focal power, and both its object side face and image side face are concave; the fifth lens has a positive focal power, and its object side face is convex; and there is no cementing between any adjacent lenses among the first to fifth lenses. The spacer element group at least includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side face of the first lens, and a second spacer element located between the second lens and the third lens and at least partially in contact with the image side face of the second lens. The effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy: -3.00 < f2 / f1 < -2.00. By the above settings of the optical imaging system, it is beneficial for the optical imaging system to achieve the technical feature of a large field of view angle. However, satisfying the conditional formula -3.00 < f2 / f1 < -2.00 will also result in a relatively large overall thickness of the second lens. At the same time, controlling the distance EP12 on the optical axis from the image side face of the first spacer element to the object side face of the second spacer element, the distance EP01 on the optical axis from the object side end face of the lens barrel to the object side face of the first spacer element, and the air gap T12 between the first lens and the second lens on the optical axis to satisfy: 1.10 < (EP12 - EP01) / T12 < 2.20 can control the edge thickness of the second lens within a more reasonable range, which not only ensures the thickness ratio of the second lens but also ensures the structural strength of the overall second lens, thereby helping to improve the structural strength of the overall lens. After the lens undergoes mechanical reliability tests such as dropping / impact, the internal deformation of the lens can be controlled within a smaller range, and finally the performance of the lens after such mechanical reliability tests is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In combination with the drawings, through the following detailed description of non-limiting embodiments, other features, objects, and advantages of the present application will become more obvious. In the drawings:

[0020] Figure 1 shows a schematic diagram of the structure and related parameters of an optical imaging system according to an exemplary embodiment of the present application;

[0021] Figure 2 shows a schematic diagram of the structure of an optical imaging system according to Embodiment 1 of the present application;

[0022] Figure 3A schematic structural diagram of an optical imaging system according to Embodiment 2 of the present application is shown;

[0023] Figure 4 A schematic structural diagram of an optical imaging system according to Embodiment 3 of the present application is shown;

[0024] Figure 5 , Figure 6 and Figure 7 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system according to Embodiment 1, Embodiment 2 and Embodiment 3 of the present application are respectively shown;

[0025] Figure 8 A schematic structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown;

[0026] Fig. 9 A schematic structural diagram of an optical imaging system according to Embodiment 5 of the present application is shown;

[0027] Fig.10 A schematic structural diagram of an optical imaging system according to Embodiment 6 of the present application is shown;

[0028] Fig.11 , Fig.12 and Fig.13 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system according to Embodiment 4, Embodiment 5 and Embodiment 6 of the present application are respectively shown;

[0029] Fig.14 A schematic structural diagram of an optical imaging system according to Embodiment 7 of the present application is shown;

[0030] Fig.15 A schematic structural diagram of an optical imaging system according to Embodiment 8 of the present application is shown;

[0031] Fig.16 A schematic structural diagram of an optical imaging system according to Embodiment 9 of the present application is shown;

[0032] Fig.17 , Fig.18 and Fig.19 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the optical imaging system according to Embodiment 7, Embodiment 8 and Embodiment 9 of the present application are respectively shown;

[0033] Fig. 20 The light spot formed by the reverse stray light in the first lens is shown when the optical imaging system satisfies the conditional formula (d0s-d0m) / f=2.2 and (d0s-d1s) / CT1=7.5;

[0034] Fig.21The optical imaging system shows the light spot formed by the reverse stray light in the first lens when the conditional formula (d0s-d0m) / f=2.2 and (d0s-d1s) / CT1=10.5 is met; and

[0035] Fig. 22 The light spot formed by the reverse stray light in the first lens is shown when the optical imaging system satisfies the conditional formula (d0s-d0m) / f=2.2 and (d0s-d1s) / CT1=14.0. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] In this article, the paraxial area refers to the area near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial area. The judgment of the surface type in the paraxial area can be judged according to the general method in this field, for example, the positive and negative R value (R refers to the radius of curvature of the paraxial area) is used to judge the concave and convex. In this article, the surface of each lens closest to the subject is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens. For the object side, when the R value is positive, it is judged as a convex surface, and when the R value is negative, it is judged as a concave surface; for the image side, when the R value is positive, it is judged as a concave surface, and when the R value is negative, it is judged as a convex surface.

[0040] 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.

[0041] 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.

[0042] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments 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 also be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0043] The features, principles and other aspects of the present application are described in detail below.

[0044] The optical imaging system according to an exemplary embodiment of the present application may include a lens barrel and a lens group and a spacer element group accommodated in the lens barrel. The lens group may be a five-piece lens group, including a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side to the image side along the optical axis.

[0045] In an exemplary embodiment, the first lens may have negative power, and its image side surface may be concave. The second lens may have positive power, and its image side surface may be convex. The third lens may have positive power, and its object side surface may be convex, and its image side surface may be convex. The fourth lens may have negative power, and its object side surface may be concave, and its image side surface may be concave. The fifth lens may have positive power, and its object side surface may be convex.

[0046] In an exemplary embodiment, there may be no cementation between any two adjacent lenses among the first to fifth lenses, and there may be an air gap between any two adjacent lenses among the first to fifth lenses.

[0047] In an exemplary embodiment, the object side end surface of the lens barrel closest to the object side may have the largest opening size, and the image side end surface closest to the image side may have the smallest opening size; the inner annular surface of the lens barrel may be stepped, and the opening sizes of each step of the stepped structure decrease in sequence from the object side end to the image side end. In an exemplary embodiment, the opening size of the object side end surface of the lens barrel closest to the object side may be equal to the value of the inner diameter d0s of the object side end surface of the lens barrel, and the opening size of the image side end surface of the lens barrel closest to the image side may be equal to the value of the inner diameter d0m of the image side end surface of the lens barrel, and the value of d0s is greater than the value of d0m.

[0048] In an exemplary embodiment, a spacer element group in an optical imaging system may include at least a first spacer element located between a first lens and a second lens and at least partially in contact with an image side surface of the first lens.

[0049] In an exemplary embodiment, the optical imaging system of the present application may satisfy the conditional formula 1.50<(d0s-d0m) / f<2.50, wherein d0s is the inner diameter of the object side end surface of the lens barrel, d0m is the inner diameter of the image side end surface of the lens barrel, and f is the effective focal length of the optical imaging system. For example, d0s may be the inner diameter of the end surface or surface of the lens barrel that is closest to the object side and perpendicular to the optical axis, and d0m may be the inner diameter of the end surface or surface of the lens barrel that is closest to the image side and perpendicular to the optical axis.

[0050] In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition 8.50<(d0s-d1s) / CT1<12.10, wherein d0s is the inner diameter of the object side end surface of the lens barrel, d1s is the inner diameter of the object side surface of the first spacer element, and CT1 is the center thickness of the first lens on the optical axis.

[0051] The optical imaging system according to the embodiment of the present application includes a lens barrel and a five-piece lens group and a spacer element group assembled therein. The object side end face of the lens barrel has a maximum opening, the image side end face has a minimum opening, the inner annular surface is stepped, and the opening size of the inner annular surface decreases from the object side end face to the image side end face of the lens barrel. The lens group includes the first to fifth lenses arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has a negative optical focal length, and its image side face is a concave surface; the second lens has a positive optical focal length, and its image side face is a convex surface; the third lens has a positive optical focal length, and its object side face and image side face are both convex surfaces; the fourth lens has a negative optical focal length, and its object side face and image side face are both concave surfaces; the fifth lens has a positive optical focal length, and its object side face is a convex surface; and there is no bonding between any adjacent lenses from the first to the fifth lenses. The spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side face of the first lens. The inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel and the effective focal length f of the optical imaging system satisfy: 1.50<(d0s-d0m) / f<2.50. By the above-mentioned setting of the optical imaging system, the optical imaging system can achieve the technical characteristics of a large field of view; at the same time, the outer diameter of the first lens is larger than that of the other lenses, and the aperture of the object side face of the first lens is larger than that of the image side face, resulting in the image side face mechanism position of the first lens being prone to produce obvious internal reflection stray light. At the same time, the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacing element and the center thickness CT1 of the first lens on the optical axis are controlled to satisfy: 8.50<(d0s-d1s) / CT1<12.10, which can reasonably constrain the aperture of the first spacing element, thereby being able to effectively suppress the above-mentioned stray light.

[0052] See attached Figures 20 to 22 , Fig. 20 The light spot formed by the reverse stray light in the first lens is shown when the optical imaging system satisfies the conditional formula (d0s-d0m) / f=2.2 and (d0s-d1s) / CT1=7.5; Fig.21 The light spot formed by the reverse stray light in the first lens is shown when the optical imaging system satisfies the conditional formula (d0s-d0m) / f=2.2 and (d0s-d1s) / CT1=10.5; Fig. 22 The figure shows the light spot formed by the reverse stray light in the first lens when the optical imaging system meets the conditions (d0s-d0m) / f=2.2 and (d0s-d1s) / CT1=14.0. Fig. 20 , Fig.21 and Fig. 22It can be seen that when (d0s - d0m) / f = 2.2, that is, when the optical imaging system satisfies the condition formula 1.50 < (d0s - d0m) / f < 2.50, when the value of the condition formula (d0s - d1s) / CT1 is within the range less than or equal to 8.50, for example, equal to 7.5, as Fig. 20 shown, at this time, the spot area formed by the internal stray light in the first lens is relatively large; when the value of the condition formula (d0s - d1s) / CT1 is within the range greater than or equal to 12.10, for example, equal to 14.0, as Fig. 22 shown, at this time, the spot intensity increases significantly; when the value of the condition formula (d0s - d1s) / CT1 is within the range greater than 8.50 and less than 12.10, for example, equal to 10.5, as Fig.21 shown, at this time, the spot intensity is significantly weakened, and the spot density is significantly reduced at the same time, and there is no risk in actual shooting. Therefore, through the reasonable setting of the barrel structure, lens optical power and surface shape, and spacer elements, etc., the optical imaging system according to the embodiment of the present application controls the inner diameter d0s of the object-side end face of the barrel, the inner diameter d0m of the image-side end face of the barrel, and the effective focal length f of the optical imaging system to satisfy: 1.50 < (d0s - d0m) / f < 2.50, and at the same time controls the inner diameter d0s of the object-side end face of the barrel, the inner diameter d1s of the object-side face of the first spacer element, and the central thickness CT1 of the first lens on the optical axis to satisfy: 8.50 < (d0s - d1s) / CT1 < 12.10. While enabling the optical imaging system to achieve the technical feature of a large field of view angle, it can reasonably restrict the aperture of the first spacer element and effectively suppress the internal reflection stray light that is likely to be generated at the position of the image-side surface mechanism of the first lens.

[0053] In an exemplary embodiment, the spacer element group in the optical imaging system may further include: a second spacer element located between the second lens and the third lens and at least partially in contact with the image-side surface of the second lens.

[0054] In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition formula -3.00 < f2 / f1 < -2.00, where f2 is the effective focal length of the second lens and f1 is the effective focal length of the first lens.

[0055] In an exemplary embodiment, the optical imaging system of the present application may satisfy the condition formula 1.10 < (EP12 - EP01) / T12 < 2.20, where EP12 is the distance on the optical axis from the image-side surface of the first spacer element to the object-side surface of the second spacer element, EP01 is the distance on the optical axis from the object-side end face of the barrel to the object-side surface of the first spacer element, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0056] An optical imaging system according to an embodiment of the present application includes a lens barrel, and a five-lens group and a spacer element group assembled therein. The object-side end face of the lens barrel has a maximum opening, the image-side end face has a minimum opening, the inner annular surface is stepped, and the opening size of the inner annular surface decreases sequentially from the object-side end face to the image-side end face of the lens barrel. The lens group includes first to fifth lenses arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative optical power, and its image side face is concave; the second lens has a positive optical power, and its image side face is convex; the third lens has a positive optical power, and both its object side face and image side face are convex; the fourth lens has a negative optical power, and both its object side face and image side face are concave; the fifth lens has a positive optical power, and its object side face is convex; and there is no cementing between any adjacent lenses among the first to fifth lenses. The spacer element group at least includes a first spacer element located between the first lens and the second lens and at least partially in contact with the image side face of the first lens, and a second spacer element located between the second lens and the third lens and at least partially in contact with the image side face of the second lens. The effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy: -3.00 < f2 / f1 < -2.00. Through the above settings of the optical imaging system, it is beneficial for the optical imaging system to achieve the technical feature of a large field of view angle. However, satisfying the conditional formula -3.00 < f2 / f1 < -2.00 will also result in a relatively large overall thickness of the second lens. At the same time, controlling the distance EP12 on the optical axis from the image side face of the first spacer element to the object side face of the second spacer element, the distance EP01 on the optical axis from the object side end face of the lens barrel to the object side face of the first spacer element, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 1.10 < (EP12 - EP01) / T12 < 2.20 can control the edge thickness of the second lens within a more reasonable range, which not only ensures the thickness ratio of the second lens but also ensures the structural strength of the overall second lens, thereby helping to improve the structural strength of the overall lens. After the lens undergoes mechanical reliability tests such as dropping / impact, the internal deformation of the lens can be controlled within a smaller range, ultimately ensuring the performance of the lens after such mechanical reliability tests.

[0057]

[0058] Table 1

[0059] Table 1 shows that, through reasonable settings of the barrel structure, lens focal power, surface shape, spacer elements, etc. of the optical imaging system according to the embodiments of the present application, while controlling the effective focal length f2 of the second lens and the effective focal length f1 of the first lens to satisfy: -3.00 < f2 / f1 < -2.00, when the value of the conditional formula (EP12 - EP01) / T12 is within different ranges, the system has different performance after the reliability test. Analyzing Table 1, it can be seen that when the value of the conditional formula (EP12 - EP01) / T12 is in the range greater than 1.10 and less than 2.20, for example, equal to 1.25, at this time, the deformation inside the lens of the system is relatively smaller during the reliability test, the overall structural strength is higher, and the performance of the system after the test is better; when the value of the conditional formula (EP12 - EP01) / T12 is in the range less than or equal to 1.10, for example, equal to 0.8, and when the value of the conditional formula (EP12 - EP01) / T12 is in the range greater than or equal to 2.20, for example, equal to 3.0, at this time, the deformation inside the lens of the system is relatively larger during the reliability test, the overall structural strength is relatively weaker, and the performance of the system after the test is poorer. Therefore, through reasonable settings of the barrel structure, lens focal power, surface shape, spacer elements, etc. of the optical imaging system according to the embodiments of the present application, controlling the effective focal length f2 of the second lens and the effective focal length f1 of the first lens to satisfy: -3.00 < f2 / f1 < -2.00, and at the same time controlling the distance EP12 on the optical axis from the image side of the first spacer element to the object side of the second spacer element, the distance EP01 on the optical axis from the object side end face of the barrel to the object side of the first spacer element, and the air gap T12 on the optical axis between the first lens and the second lens to satisfy: 1.10 < (EP12 - EP01) / T12 < 2.20, while facilitating the technical features of the optical imaging system to achieve a large field of view angle, the edge thickness of the second lens can be controlled within a more reasonable range, which not only ensures the thickness ratio of the second lens, but also ensures the overall structural strength of the second lens, thereby helping to improve the overall structural strength of the lens. After the lens undergoes mechanical reliability tests such as dropping / impact, the deformation inside the lens can be controlled within a smaller range, and finally the performance of the lens after such mechanical reliability tests is ensured.

[0060] In an exemplary embodiment, the spacer element group in the optical imaging system may further include: a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side of the third lens.

[0061] In an exemplary embodiment, the spacer element group in the optical imaging system may further include: a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side of the fourth lens.

[0062] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 5.80<(EP12 / DT12)×(EP12 / DT22)<8.20, wherein EP12 is the distance on the optical axis from the image side surface of the first spacing element to the object side surface of the second spacing element, DT12 is the maximum effective radius of the image side surface of the first lens, and DT22 is the maximum effective radius of the image side surface of the second lens. By satisfying the conditional formula 5.80<(EP12 / DT12)×(EP12 / DT22)<8.20 through the control system, the lens edge thickness of the second lens and the maximum effective radius of the first and second lenses can be controlled within a suitable range, which can effectively ensure that the angle of refraction of light between the first and second lenses is within a suitable range, and ensure that each field of view imaging light is refracted and passed through the front section of the optical system in the required direction.

[0063] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.40<(EP23 / T23)×|f3 / R6|<3.10, wherein EP23 is the distance on the optical axis from the image side surface of the second spacer element to the object side surface of the third spacer element, T23 is the air spacing on the optical axis between the second lens and the third lens, f3 is the effective focal length of the third lens, and R6 is the radius of curvature of the image side surface of the third lens. By controlling the optical imaging system to satisfy the conditional formula 0.40<(EP23 / T23)×|f3 / R6|<3.10, it can be ensured that the overall curvature of the image side surface of the second lens and the object side surface and image side surface of the third lens is within the required range, and the effective focal length of the third lens is further controlled, thereby effectively controlling and ensuring the refraction direction and angle of the imaging light in the middle section of the optical system, and at the same time effectively controlling the edge thickness of the third lens, ensuring the stability of the third lens during the molding process, and reducing the risk of weld marks.

[0064] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 20<(EP34 / CT4)×(L / f)<22, wherein EP34 is the distance on the optical axis from the image side surface of the third spacing element to the object side surface of the fourth spacing element, CT4 is the center thickness of the fourth lens on the optical axis, L is the maximum distance on the optical axis from the object side end surface of the lens barrel to the image side end surface, and f is the effective focal length of the optical imaging system. By controlling the optical imaging system to satisfy the conditional formula 20<(EP34 / CT4)×(L / f)<22, the edge thickness and middle thickness of the fourth lens can be directly controlled, ensuring that the overall thickness ratio of the fourth lens is within a reasonable range, effectively reducing the risk of weld marks on the fourth lens, and at the same time, the height and focal length of the overall lens can be synchronously controlled to keep the total optical length TTL of the lens within a reasonable range.

[0065] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 1.60<(D1s-D0m) / EPD<3.00, wherein D1s is the outer diameter of the object side surface of the first spacing element, D0m is the outer diameter of the image side end surface of the lens barrel, and EPD is the entrance pupil diameter of the optical imaging system. By controlling the optical imaging system to satisfy the conditional formula 1.60<(D1s-D0m) / EPD<3.00, the aperture of the lens can be effectively controlled, thereby ensuring the overall light intake of the lens, and ensuring that the FNO and CRA optical principal value parameters are within the required range; at the same time, this conditional formula also helps to control the difference between the large end diameter and the small end diameter of the lens within a suitable range, thereby ensuring that the diameter step difference of the five lenses is within a suitable range, which is beneficial to the assembly stability of the lens assembly process.

[0066] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula -2.00<(D2s-D3s) / (d3s-d2s)<3.20, wherein D2s is the outer diameter of the object side surface of the second spacer element, D3s is the outer diameter of the object side surface of the third spacer element, d3s is the inner diameter of the object side surface of the third spacer element, and d2s is the inner diameter of the object side surface of the second spacer element. By controlling the optical imaging system to satisfy the conditional formula -2.00<(D2s-D3s) / (d3s-d2s)<3.20, the difference between the inner and outer diameters of the second spacer element and the third spacer element can be controlled within a suitable range, and the reasonable inner and outer diameter settings of the second spacer element are conducive to intercepting the optical path of the emission direction of the transmitted stray light of the second lens, and the reasonable settings of the inner and outer aperture values ​​of the third spacer element are conducive to controlling the reflected stray light on the hypotenuse of the inner diameter of the third spacer element.

[0067] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 2.10<(d4m+d4s) / R9<3.50, wherein d4m is the inner diameter of the image side surface of the fourth spacing element, d4s is the inner diameter of the object side surface of the fourth spacing element, and R9 is the radius of curvature of the object side surface of the fifth lens. By controlling the optical imaging system to satisfy the conditional formula 2.10<(d4m+d4s) / R9<3.50, it is helpful to ensure that the emission of stray light transmitted from the edge of the optical effective diameter of the fourth lens is intercepted, and the overall surface curvature of the object side surface of the fifth lens is effectively controlled, thereby ensuring the refraction direction and angle of the imaging light after entering the last lens, and finally effectively ensuring the image height of each field of view.

[0068] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional expression 0.10 < (D4m - d3m) / f34 < 0.40, where D4m is the outer diameter of the image side of the fourth spacer element, d3m is the inner diameter of the image side of the third spacer element, and f34 is the combined focal length of the third lens and the fourth lens. By controlling the optical imaging system to satisfy the conditional expression 0.10 < (D4m - d3m) / f34 < 0.40, the light converging ability of the combination of the third and fourth lenses is ensured, which ultimately helps to ensure the refraction angle and propagation direction of the imaging light after passing through the third and fourth lenses in the middle section of the optical system.

[0069] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional expression 0.10 < f12 / R1 × (d1s / CT2) < 2.10, where f12 is the combined focal length of the first lens and the second lens, R1 is the curvature radius of the object side of the first lens, d1s is the inner diameter of the object side of the first spacer element, and CT2 is the central thickness of the second lens on the optical axis. By controlling the system to satisfy the conditional expression 0.10 < f12 / R1 × (d1s / CT2) < 2.10, the combined focal length of the first two lenses, the surface shape of the object side of the first lens, the central thickness of the second lens, and the inner aperture diameter of the first spacer element can be effectively controlled, which can ensure the incident angle and refraction direction of the imaging light when entering the front end of the optical system, and ensure that the maximum field of view FOV of the optical system meets the design requirements.

[0070] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional expression 1.00 < d4s / R8 × (D4m / R9) < 1.90, where d4s is the inner diameter of the object side of the fourth spacer element, R8 is the curvature radius of the image side of the fourth lens, D4m is the outer diameter of the image side of the fourth spacer element, and R9 is the curvature radius of the object side of the fifth lens. By controlling the system to satisfy the conditional expression 1.00 < d4s / R8 × (D4m / R9) < 1.90, the curvature radii of the image side of the fourth lens and the object side of the fifth lens can be controlled within a suitable range, and the surface shapes of these two sides can be effectively controlled, which can ensure the refraction propagation direction of the imaging light between the fourth and fifth lenses, and thus can control the image height of each field of view and the optical back focus of the lens to meet the design requirements to a certain extent.

[0071] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.40 < EP23 / (SAG22 + T23) < 2.60, where EP23 is the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element, SAG22 is the axial distance from the intersection of the image side of the second lens and the optical axis to the vertex of the effective radius of the image side of the second lens, and T23 is the air gap between the second lens and the third lens on the optical axis. By controlling the optical imaging system to satisfy the conditional formula 0.40 < EP23 / (SAG22 + T23) < 2.60, the thickness of the second spacer element, the edge thickness of the third lens, and the sag of the image side of the second lens can be effectively controlled, ensuring the balance between the edge thickness of the third lens and the thickness of the front spacer ring (second spacer element), thereby ensuring the thickness ratio of the third lens and the thickness of the spacer element. Finally, the risk of welding marks on the third lens can be minimized, and the overall strength and assembly stability of the spacer element can be ensured.

[0072] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 0.80 < EP23 / SAG32 < 4.00, where EP23 is the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element, and SAG32 is the axial distance from the intersection of the image side of the third lens and the optical axis to the vertex of the effective radius of the image side of the third lens. By controlling the optical imaging system to satisfy the conditional formula 0.80 < EP23 / SAG32 < 4.00 and controlling the ratio of the edge thickness of the third lens to the sag of the image side within a suitable range, the minimum edge thickness of the third lens and the maximum sag of the image side can be effectively controlled, ensuring the demolding stability of the third lens and the surface shape stability of the image side of the third lens.

[0073] In an exemplary embodiment, the optical imaging system of the present application can satisfy the conditional formula 4.50 < d4s / (SAG41 + SAG42) < 8.70, where d4s is the inner diameter of the object side of the fourth spacer element, SAG41 is the axial distance from the intersection of the object side of the fourth lens and the optical axis to the vertex of the effective radius of the object side of the fourth lens, and SAG42 is the axial distance from the intersection of the image side of the fourth lens and the optical axis to the vertex of the effective radius of the image side of the fourth lens. By controlling the optical imaging system to satisfy the conditional formula 4.50 < d4s / (SAG41 + SAG42) < 8.70, the sags of the object side and the image side of the fourth lens can be reasonably controlled. The overall effective diameter range of the lens is designed as a biconcave lens, and a material with a suitable refractive index is used. Finally, the refraction direction and the exit direction of the imaging light in this lens are ensured.

[0074] In an exemplary embodiment, the optical imaging system of the present application may include at least one aperture. The aperture may constrain the optical path and control the light intensity. The aperture may be set at an appropriate position of the optical imaging system, for example, the aperture may be set between the second lens and the third lens.

[0075] In an exemplary embodiment, optionally, the optical imaging system may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0076] In an exemplary embodiment, the object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens may have one or more aspherical mirror surfaces, and the aspherical mirror surfaces have better curvature radius characteristics, and have the advantages of improving distortion aberration and improving astigmatism aberration. The use of aspherical mirror surfaces can eliminate aberrations that occur during imaging as much as possible, thereby improving imaging quality.

[0077] On the one hand, an optical imaging system according to an embodiment of the present application includes a lens barrel and a five-piece lens group and a spacer element group assembled therein. The object side end face of the lens barrel has a maximum opening, the image side end face has a minimum opening, the inner annular surface is stepped, and the opening size of the inner annular surface decreases from the object side end face to the image side end face of the lens barrel. The lens group includes first to fifth lenses arranged in sequence from the object side to the image side along the optical axis, wherein the first lens has a negative optical focal length, and its image side face is a concave surface; the second lens has a positive optical focal length, and its image side face is a convex surface; the third lens has a positive optical focal length, and its object side face and image side face are both convex surfaces; the fourth lens has a negative optical focal length, and its object side face and image side face are both concave surfaces; the fifth lens has a positive optical focal length, and its object side face is a convex surface; and there is no bonding between any adjacent lenses from the first to the fifth lenses. The spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side face of the first lens. The inner diameter d0s of the object side end face of the lens barrel, the inner diameter d0m of the image side end face of the lens barrel and the effective focal length f of the optical imaging system satisfy: 1.50<(d0s-d0m) / f<2.50. By the above-mentioned setting of the optical imaging system, the optical imaging system can achieve the technical characteristics of a large field of view; at the same time, the outer diameter of the first lens is larger than that of the other lenses, and the aperture of the object side face of the first lens is larger than that of the image side face, resulting in the image side face mechanism position of the first lens being prone to produce obvious internal reflection stray light. At the same time, the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacing element and the center thickness CT1 of the first lens on the optical axis are controlled to satisfy: 8.50<(d0s-d1s) / CT1<12.10, which can reasonably constrain the aperture of the first spacing element, thereby being able to effectively suppress the above-mentioned stray light.

[0078] On the other hand, the optical imaging system according to an embodiment of the present application includes a lens barrel and a five-lens group and a spacer element group assembled therein. The object-side end face of the lens barrel has a maximum opening, the image-side end face has a minimum opening, the inner ring surface is stepped, and the opening size of the inner ring surface decreases sequentially from the object-side end face to the image-side end face of the lens barrel. The lens group includes first to fifth lenses arranged in sequence from the object side to the image side along the optical axis. Among them, the first lens has a negative optical power, and its image side is concave; the second lens has a positive optical power, and its image side is convex; the third lens has a positive optical power, and both its object side and image side are convex; the fourth lens has a negative optical power, and both its object side and image side are concave; the fifth lens has a positive optical power, and its object side is convex; and there is no cementing between any adjacent lenses among the first to fifth lenses. The spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially contacting the image side of the first lens, and a second spacer element located between the second lens and the third lens and at least partially contacting the image side of the second lens. The effective focal length f2 of the second lens and the effective focal length f1 of the first lens satisfy: -3.00 < f2 / f1 < -2.00. By the above settings of the optical imaging system, it is beneficial for the optical imaging system to achieve the technical feature of a large field of view angle. However, simultaneously satisfying -3.00 < f2 / f1 < -2.00 will also result in a relatively large overall thickness of the second lens. At the same time, controlling the distance EP12 on the optical axis from the image side of the first spacer element to the object side of the second spacer element, the distance EP01 on the optical axis from the object-side end face of the lens barrel to the object side of the first spacer element, and the air gap T12 between the first lens and the second lens on the optical axis to satisfy: 1.10 < (EP12 - EP01) / T12 < 2.20 can control the edge thickness of the second lens within a more reasonable range, ensuring both the thickness ratio of the second lens and the overall structural strength of the second lens. Furthermore, it helps to improve the overall structural strength of the lens. After the lens undergoes mechanical reliability tests such as dropping / impact, the internal deformation of the lens can be controlled within a smaller range, ultimately ensuring the performance of the lens after such mechanical reliability tests.

[0079] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the optical imaging system can be changed, and the number of spacer elements can also be changed to obtain the various results and advantages described in this specification. The present application does not make specific limitations in this regard. For example, although five lenses are described as an example in the embodiment, the optical imaging system is not limited to including five lenses. If necessary, the optical imaging system may also include other numbers of lenses. Also, for example, according to needs, the optical imaging system may also include other numbers of spacer elements different from those described in the above embodiment.

[0080] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments are further described below with reference to the accompanying drawings.

[0081] Example 1

[0082] The following reference Figure 2 An optical imaging system according to Example 1 of the present application is described.

[0083] like Figure 2 As shown, in this embodiment, the optical imaging system includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 assembled in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis.

[0084] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and at least partially in contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and at least partially in contact with the image side surface of the fourth lens E4.

[0085] In this embodiment, the first lens E1 has negative power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive power, its object side surface S9 is convex, and its image side surface S10 is convex.

[0086] Table 2 shows the basic parameters of the optical imaging system of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0087]

[0088]

[0089] Table 2

[0090] 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:

[0091]

[0092] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Tables 3-1 and 3-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 and A 24 .

[0093] Face number A4 A6 A8 A10 A12 A14 S1 6.1761E-03 -1.1342E-03 1.5622E-04 -1.5228E-05 1.0056E-06 -4.2167E-08 S2 5.3431E-03 -4.6601E-03 5.8138E-03 -6.0960E-03 4.1587E-03 -1.9817E-03 S3 -8.8866E-03 9.0678E-04 -1.4115E-03 1.0007E-03 -4.8240E-04 1.4084E-04 S4 -1.5297E-02 8.4544E-03 -3.9449E-03 1.7721E-03 -2.6110E-04 -2.7273E-04 S5 -2.2655E-02 6.6779E-03 -2.5052E-03 1.0412E-03 -3.8844E-04 8.3840E-05 S6 -9.1201E-03 -1.4637E-03 3.5852E-03 -2.4050E-03 1.3605E-03 -5.1879E-04 S7 1.4177E-02 1.7567E-02 -2.8500E-02 1.9368E-02 -7.2313E-03 1.4625E-03 S8 -3.3183E-03 3.0766E-02 -3.3760E-02 2.0526E-02 -7.7020E-03 1.7562E-03 S9 -2.8952E-02 6.9025E-03 -4.7126E-04 -1.0362E-03 7.5016E-04 -2.8563E-04 S10 -7.4479E-03 3.0915E-04 1.0183E-03 -6.8447E-04 2.5190E-04 -5.8510E-05

[0094] Table 3-1

[0095]

[0096]

[0097] Table 3-2

[0098] Referring to Table 8, the values ​​of multiple relevant parameters of the lens barrel P0 and each of the spacer elements P1, P2, P3, and P4 in this embodiment are respectively shown in the 'Example 1' column of Table 8, and the specific descriptions of the multiple relevant parameters shown in Table 8 are respectively as follows: d1s is the inner diameter of the object side surface of the first spacer element P1, D1s is the outer diameter of the object side surface of the first spacer element P1, d2s is the inner diameter of the object side surface of the second spacer element P2, D2s is the outer diameter of the object side surface of the second spacer element P2, d3s is the inner diameter of the object side surface of the third spacer element P3, d3m is the inner diameter of the image side surface of the third spacer element P3, D3s is the outer diameter of the object side surface of the third spacer element P3, d4s is the inner diameter of the object side surface of the fourth spacer element P4, and d4m is the outer diameter of the object side surface of the fourth spacer element P4. The inner diameter of the image side surface of the fourth spacing element P4, D4m is the outer diameter of the image side surface of the fourth spacing element P4, d0s is the inner diameter of the object side end surface of the lens barrel P0, d0m is the inner diameter of the image side end surface of the lens barrel P0, EP01 is the distance on the optical axis from the object side end surface of the lens barrel P0 to the object side surface of the first spacing element P1, EP12 is the distance on the optical axis from the image side surface of the first spacing element P1 to the object side surface of the second spacing element P2, EP23 is the distance on the optical axis from the image side surface of the second spacing element P2 to the object side surface of the third spacing element P3, EP34 is the distance on the optical axis from the image side surface of the third spacing element P3 to the object side surface of the fourth spacing element P4, and L is the maximum distance on the optical axis from the object side end surface of the lens barrel P0 to the image side end surface. The units of the above-mentioned parameter values ​​shown in Table 8 are all millimeters (mm), and the above-mentioned parameters are schematically shown in the structural diagram of the optical imaging system as follows: Figure 1 shown.

[0099] Example 2

[0100] The following reference Figure 3 Describe the optical imaging system according to Example 2 of the present application.

[0101] like Figure 3 As shown, in this embodiment, similar to Embodiment 1, the optical imaging system also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 contained in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and at least partially in contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and at least partially in contact with the image side surface of the fourth lens E4.

[0102] In addition, the basic parameter table of the optical imaging system of this embodiment is the same as Table 2, and the high-order coefficient table of the aspheric mirror surface is the same as Table 3-1 and Table 3-2.

[0103] The difference between this embodiment and embodiment 1 is that the values ​​of all or part of the relevant parameters shown in Table 8 are different, and the values ​​of the parameters in this embodiment are shown in the 'Example 2' column in Table 8. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0104] Example 3

[0105] The following reference Figure 4 Describe the optical lens according to Example 3 of the present application.

[0106] like Figure 4 As shown, in this embodiment, similar to Embodiment 1, the optical imaging system also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 contained in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and at least partially in contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and at least partially in contact with the image side surface of the fourth lens E4.

[0107] In addition, the basic parameter table of the optical imaging system of this embodiment is also the same as Table 2, and the high-order coefficient table of the aspheric mirror surface is also the same as Table 3-1 and Table 3-2.

[0108] The difference between this embodiment and embodiment 1 is that the values ​​of all or part of the relevant parameters shown in Table 8 are different, and the values ​​of the parameters in this embodiment are shown in the 'Example 3' column in Table 8. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0109] Figure 5 The axial chromatic aberration curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Figure 6 Astigmatism curves of the optical imaging systems of Example 1, Example 2 and Example 3 are shown, which represent meridional image curvature and sagittal image curvature. Figure 7The distortion curves of the optical imaging systems of Embodiment 1, Embodiment 2 and Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figures 5 to 7 It can be seen that the optical imaging systems provided in Embodiment 1, Embodiment 2 and Embodiment 3 can achieve good imaging quality.

[0110] Example 4

[0111] The following reference Figure 8 Describe the optical imaging system according to Example 4 of the present application.

[0112] like Figure 8 As shown, in this embodiment, the optical imaging system includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 assembled in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis.

[0113] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and at least partially in contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and at least partially in contact with the image side surface of the fourth lens E4.

[0114] In this embodiment, the first lens E1 has negative power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive power, its object side surface S9 is convex, and its image side surface S10 is concave.

[0115] Table 4 shows the basic parameters of the optical imaging system of Example 4, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0116]

[0117]

[0118] Table 4

[0119] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Tables 5-1 and 5-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 and A 24 .

[0120] Face number A4 A6 A8 A10 A12 A14 S1 3.7130E-03 -9.0575E-04 1.8347E-04 -2.5662E-05 2.3808E-06 -1.3758E-07 S2 7.5065E-04 -3.7498E-03 2.2451E-03 -6.4578E-04 -7.8445E-04 9.2791E-04 S3 -6.5461E-03 -7.1085E-04 3.7401E-04 -3.2883E-04 1.3428E-04 -3.0713E-05 S4 -9.6367E-03 -3.0920E-03 1.2296E-02 -1.2648E-02 7.2425E-03 -2.3934E-03 S5 -1.5177E-02 -2.8696E-03 8.2601E-03 -7.6659E-03 3.5414E-03 -8.5411E-04 S6 -4.3230E-02 6.2631E-02 -5.4862E-02 3.3992E-02 -1.4643E-02 4.1575E-03 S7 -1.4407E-03 3.4076E-02 -3.4898E-02 2.1289E-02 -7.8635E-03 1.6159E-03 S8 3.2852E-02 -1.6274E-02 1.4114E-02 -1.5496E-02 1.3654E-02 -7.7438E-03 S9 -1.0694E-02 1.1666E-03 -4.7056E-04 1.9838E-04 -6.7735E-05 1.6235E-05 S10 4.4094E-03 -1.7583E-03 5.5464E-04 -1.1029E-04 -8.4942E-06 1.1443E-05

[0121] Table 5-1

[0122] Face number A16 A18 A20 A22 A24 S1 4.4562E-09 -6.1297E-11 0.0000E+00 0.0000E+00 0.0000E+00 S2 -4.6840E-04 1.3489E-04 -2.2977E-05 2.1639E-06 -8.7495E-08 S3 3.6338E-06 -1.6441E-07 0.0000E+00 0.0000E+00 0.0000E+00 S4 4.2607E-04 -3.1468E-05 0.0000E+00 0.0000E+00 0.0000E+00 S5 8.5478E-05 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 -6.9866E-04 5.2971E-05 0.0000E+00 0.0000E+00 0.0000E+00 S7 -1.4023E-04 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S8 2.6072E-03 -4.7449E-04 3.5837E-05 0.0000E+00 0.0000E+00 S9 -2.5831E-06 2.5135E-07 -1.3183E-08 2.7407E-10 0.0000E+00 S10 -2.9983E-06 3.8364E-07 -2.4723E-08 6.3998E-10 0.0000E+00

[0123] Table 5-2

[0124] Referring to Table 8, the values ​​of the relevant parameters in this embodiment are shown in the 'Example 4' column in Table 8, wherein the specific description of the meaning represented by each parameter is the same as that in the above Example 1, and will not be repeated here.

[0125] Example 5

[0126] The following reference Fig. 9 Describe the optical imaging system according to Example 5 of the present application.

[0127] like Fig. 9 As shown, in this embodiment, similar to Embodiment 4, the optical imaging system also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 contained in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and in at least partial contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and in at least partial contact with the image side surface of the fourth lens E4.

[0128] In addition, the basic parameter table of the optical imaging system of this embodiment is the same as Table 4, and the high-order coefficient table of the aspheric mirror surface is the same as Table 5-1 and Table 5-2.

[0129] The difference between this embodiment and embodiment 4 is that the values ​​of all or part of the relevant parameters shown in Table 8 are different, and the values ​​of the parameters in this embodiment are shown in the 'Example 5' column in Table 8. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0130] Example 6

[0131] The following reference Fig.10 Describe the optical lens according to Example 6 of the present application.

[0132] like Fig.10 As shown, in this embodiment, similar to Embodiment 4, the optical imaging system also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 contained in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and in at least partial contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and in at least partial contact with the image side surface of the fourth lens E4.

[0133] In addition, the basic parameter table of the optical imaging system of this embodiment is the same as Table 4, and the high-order coefficient table of the aspheric mirror surface is the same as Table 5-1 and Table 5-2.

[0134] The difference between this embodiment and embodiment 4 is that the values ​​of all or part of the relevant parameters shown in Table 8 are different, and the values ​​of the parameters in this embodiment are shown in the 'Example 6' column in Table 8. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0135] Fig.11 The axial chromatic aberration curves of the optical imaging systems of Examples 4, 5 and 6 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig.12 Astigmatism curves of the optical imaging systems of Example 4, Example 5 and Example 6 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.13 The distortion curves of the optical imaging systems of Embodiment 4, Embodiment 5 and Embodiment 6 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figures 11 to 13It can be seen that the optical imaging systems provided in Embodiment 4, Embodiment 5 and Embodiment 6 can achieve good imaging quality.

[0136] Example 7

[0137] The following reference Fig.14 Describe the optical imaging system according to Example 7 of the present application.

[0138] like Fig.14 As shown, in this embodiment, the optical imaging system includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 assembled in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis.

[0139] In this embodiment, the optical imaging system further comprises a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and at least partially in contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and at least partially in contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and at least partially in contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and at least partially in contact with the image side surface of the fourth lens E4.

[0140] In this embodiment, the first lens E1 has negative power, its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative power, its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive power, its object side surface S9 is convex, and its image side surface S10 is convex.

[0141] Table 6 shows the basic parameters of the optical imaging system of Example 7, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0142]

[0143] Table 6

[0144] In this embodiment, the object side surface and the image side surface of any lens of the first lens E1 to the fifth lens E5 are both aspherical surfaces, and the surface shape of each aspherical surface can be defined by the formula (1) given in the above embodiment 1. Tables 7-1 and 7-2 show the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50 10 , A 12 , A14 , A 16 , A 18 , A 20 , A 22 and A 24 .

[0145] Face number A4 A6 A8 A10 A12 A14 S1 8.9389E-03 -2.0815E-03 3.4910E-04 -3.9869E-05 3.0247E-06 -1.4519E-07 S2 6.3954E-03 -5.0335E-03 5.4581E-03 -5.6001E-03 3.6817E-03 -1.7141E-03 S3 -9.6714E-03 9.7274E-04 -1.3567E-03 8.4008E-04 -3.5440E-04 9.8749E-05 S4 -1.0065E-02 2.1537E-03 2.1393E-03 -3.5454E-03 2.7828E-03 -1.2513E-03 S5 -1.6167E-02 2.1488E-03 -5.7274E-04 4.8433E-04 -2.4759E-04 5.2568E-05 S6 -1.2452E-02 -8.9666E-03 2.2670E-02 -1.7743E-02 7.4840E-03 -1.8205E-03 S7 1.0068E-02 9.2784E-03 -6.3130E-03 1.2914E-03 -1.7186E-04 7.1860E-05 S8 -9.2040E-03 3.1055E-02 -2.9162E-02 1.6420E-02 -6.2065E-03 1.5583E-03 S9 -3.0930E-02 7.0161E-03 -2.6896E-04 -1.2121E-03 8.3303E-04 -3.0781E-04 S10 -4.8002E-03 -1.0102E-03 1.6316E-03 -1.0043E-03 4.0255E-04 -1.0871E-04

[0146] Table 7-1

[0147]

[0148]

[0149] Table 7-2

[0150] Referring to Table 8, the values ​​of the relevant parameters in this embodiment are shown in the 'Embodiment 7' column in Table 8, wherein the specific description of the meaning represented by each parameter is the same as that in the above-mentioned Embodiment 1, and will not be repeated here.

[0151] Example 8

[0152] The following reference Fig.15 Describe the optical imaging system according to Example 8 of the present application.

[0153] like Fig.15 As shown, in this embodiment, similar to Embodiment 7, the optical imaging system also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 contained in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and in at least partial contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and in at least partial contact with the image side surface of the fourth lens E4.

[0154] In addition, the basic parameter table of the optical imaging system of this embodiment is the same as Table 6, and the high-order coefficient table of the aspheric mirror surface is the same as Table 7-1 and Table 7-2.

[0155] The difference between this embodiment and embodiment 7 is that the values ​​of all or part of the relevant parameters shown in Table 8 are different, and the values ​​of the parameters in this embodiment are shown in the 'Embodiment 7' column in Table 8. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0156] Example 9

[0157] The following reference Fig.16 Describe the optical lens according to Example 9 of the present application.

[0158] like Fig.16 As shown, in this embodiment, similar to Embodiment 7, the optical imaging system also includes a lens barrel P0 and a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and a fifth lens E5 contained in the lens barrel P0 and arranged in sequence from the object side to the image side along the optical axis. The optical imaging system also includes a plurality of spacing elements: a first spacing element P1, located between the first lens E1 and the second lens E2 and in at least partial contact with the image side surface of the first lens E1; a second spacing element P2, located between the second lens E2 and the third lens E3 and in at least partial contact with the image side surface of the second lens E2; a third spacing element P3, located between the third lens E3 and the fourth lens E4 and in at least partial contact with the image side surface of the third lens E3; and a fourth spacing element P4, located between the fourth lens E4 and the fifth lens E5 and in at least partial contact with the image side surface of the fourth lens E4.

[0159] In addition, the basic parameter table of the optical imaging system of this embodiment is the same as Table 6, and the high-order coefficient table of the aspheric mirror surface is the same as Table 7-1 and Table 7-2.

[0160] The difference between this embodiment and embodiment 7 is that the values ​​of all or part of the relevant parameters shown in Table 8 are different, and the values ​​of the parameters in this embodiment are shown in the column 'Example 9' in Table 8. The specific description of the meaning represented by each parameter is the same as that in the above embodiment 1, and will not be repeated here.

[0161] Fig.17 The axial chromatic aberration curves of the optical imaging systems of Example 7, Example 8 and Example 9 are shown, which indicate the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig.18 Astigmatism curves of the optical imaging systems of Example 7, Example 8 and Example 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.19 The distortion curves of the optical imaging systems of Embodiment 7, Embodiment 8 and Embodiment 9 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figures 17 to 19 It can be seen that the optical imaging systems provided in Examples 7, 8 and 9 can achieve good imaging quality.

[0162] Parameters / Examples Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 d1s 4.150 4.210 4.270 4.550 4.610 4.650 4.110 4.170 4.230 D1s 10.000 10.100 10.160 10.000 10.100 10.160 10.000 10.100 10.160 d2s 2.780 2.840 2.900 3.550 3.610 3.650 3.160 3.350 3.470 D2s 8.500 8.600 8.660 7.110 7.260 7.380 5.770 5.770 5.770 d3s 3.490 3.550 3.610 3.380 3.440 3.480 3.720 3.780 3.840 d3m 3.490 3.550 3.610 3.380 3.440 3.480 3.720 3.780 3.840 D3s 6.300 6.400 6.460 7.500 7.600 7.660 6.300 6.400 6.460 d4s 3.650 3.710 3.770 4.540 5.480 4.640 3.970 4.030 4.090 d4m 3.650 3.710 3.770 5.810 5.870 5.910 4.920 4.980 5.040 D4m 6.200 6.300 6.360 6.630 6.760 6.820 5.670 5.880 6.060 d0s 10.600 10.700 10.760 10.600 10.700 10.760 10.600 10.700 10.760 d0m 5.360 5.360 5.360 6.390 6.390 6.390 5.400 5.400 5.400 D0m 6.620 6.720 6.780 7.700 7.800 7.860 6.620 6.720 6.780 EP01 2.370 2.370 2.370 2.120 2.120 2.120 2.240 2.240 2.240 EP12 4.960 5.010 5.060 5.250 5.300 5.350 4.420 4.420 4.420 EP23 1.810 1.760 1.710 0.450 0.500 0.550 0.510 0.560 0.610 EP34 1.100 1.100 1.100 1.100 1.100 1.100 1.260 1.260 1.260 L 12.110 12.110 12.110 13.890 13.890 13.890 11.780 11.780 11.780

[0163] Table 8

[0164] In addition, in Examples 1 to 9, the effective focal length f of the optical imaging system, the effective focal length values ​​f1 to f5 of the first lens to the fifth lens, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, the on-axis distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, the on-axis distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens, the on-axis distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the vertex of the effective radius of the object side surface of the fourth lens, the on-axis distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the vertex of the effective radius of the image side surface of the fourth lens, the entrance pupil diameter EPD of the optical imaging system, the maximum effective radius DT12 of the image side surface of the first lens, and the maximum effective radius DT22 of the image side surface of the second lens are respectively as shown in Table 9 below.

[0165]

[0166]

[0167] Table 9

[0168] Examples 1 to 9 respectively satisfy the conditions shown in Table 10 below.

[0169] Conditional / Example Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 f2 / f1 -2.61 -2.61 -2.61 -2.11 -2.11 -2.11 -2.93 -2.93 -2.93 (d0s-d0m) / f 2.19 2.24 2.26 1.57 1.61 1.63 2.18 2.23 2.25 (d0s-d1s) / CT1 8.94 8.99 8.99 11.91 11.99 12.03 10.45 10.51 10.51 (EP12-EP01) / T12 1.52 1.54 1.57 1.89 1.92 1.95 1.25 1.25 1.25 (EP12 / DT12)×(EP12 / DT22) 7.82 7.98 8.14 7.19 7.33 7.47 5.96 5.96 5.96 (EP23 / T23)×|f3 / R6| 3.06 2.97 2.89 0.69 0.76 0.84 0.50 0.55 0.60 (EP34 / CT4)×(L / f) 21.46 21.46 21.46 21.93 21.93 21.93 20.88 20.88 20.88 (D1s-D0m) / EPD 2.95 2.95 2.95 1.79 1.79 1.79 2.96 2.96 2.96 (D2s-D3s) / (d3s-d2s) 3.10 3.10 3.10 2.29 2.00 1.65 -0.95 -1.47 -1.86 (d4m+d4s) / R9 2.24 2.28 2.31 3.12 3.42 3.18 2.91 2.95 2.99 (D4m-d3m) / f34 0.18 0.19 0.19 0.36 0.37 0.37 0.12 0.12 0.13 f12 / R1×(d1s / CT2) 1.96 1.98 2.01 0.14 0.15 0.15 1.01 1.02 1.04 d4s / R8×(D4m / R9) 1.15 1.19 1.22 1.44 1.77 1.51 1.27 1.34 1.40 EP23 / (SAG22+T23) 2.52 2.45 2.38 0.54 0.60 0.66 0.46 0.51 0.55 EP23 / SAG32 3.91 3.80 3.69 1.05 1.16 1.28 0.94 1.03 1.12 d4s / (SAG41+SAG42) 5.04 5.13 5.21 7.13 8.61 7.29 4.72 4.79 4.86

[0170] Table 10

[0171] The present application also provides an imaging device, which is provided with an electronic photosensitive element for imaging, and the electronic photosensitive element can be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0172] 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 protection 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 concept of the present application. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) to form a technical solution.

Claims

1. An optical imaging system, characterized in that: The invention comprises a lens barrel and a lens group and a spacer element group accommodated in the lens barrel, wherein: The inner annular surface of the lens barrel is in a stepped shape, and the opening size of the lens barrel decreases from the object side end surface to the image side end surface; The lens group includes, in order from the object side to the image side along the optical axis: A first lens having negative optical power, whose image side surface is concave; A second lens having positive refractive power and a convex image-side surface; The third lens has positive power, and its object-side surface is convex and its image-side surface is convex; a fourth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is concave; and a fifth lens having positive refractive power and a convex object side surface; There is an air gap between any two adjacent lenses from the first lens to the fifth lens; The spacer element group includes at least: a first spacer element, located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens; The optical imaging system satisfies: 1.50<(d0s-d0m) / f<2.50 and 8.50<(d0s-d1s) / CT1<12.10, Among them, d0s is the inner diameter of the object side end surface of the lens barrel, d0m is the inner diameter of the image side end surface of the lens barrel, f is the effective focal length of the optical imaging system, d1s is the inner diameter of the object side surface of the first spacing element, and CT1 is the center thickness of the first lens on the optical axis.

2. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a second spacer element, located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; The distance EP12 from the image side surface of the first spacer element to the object side surface of the second spacer element on the optical axis, the maximum effective radius DT12 of the image side surface of the first lens, and the maximum effective radius DT22 of the image side surface of the second lens satisfy: 5.80<(EP12 / DT12)×(EP12 / DT22)<8.

20.

3. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; The distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, the effective focal length f3 of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: 0.40<(EP23 / T23)×|f3 / R6|<3.

10.

4. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, and the maximum distance L from the object side end surface to the image side end surface of the lens barrel on the optical axis satisfy: 20<(EP34 / CT4)×(L / f)<22.

5. The optical imaging system according to claim 1, characterized in that: The outer diameter D1s of the object side surface of the first spacer element, the outer diameter D0m of the image side end surface of the lens barrel and the entrance pupil diameter EPD of the optical imaging system satisfy: 1.60<(D1s-D0m) / EPD<3.

00.

6. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; The outer diameter D2s of the object side surface of the second spacer element, the outer diameter D3s of the object side surface of the third spacer element, the inner diameter d3s of the object side surface of the third spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy: -2.00<(D2s-D3s) / (d3s-d2s)<3.

20.

7. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a fourth spacer element, located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The inner diameter d4m of the image side surface of the fourth spacer element, the inner diameter d4s of the object side surface of the fourth spacer element, and the curvature radius R9 of the object side surface of the fifth lens satisfy: 2.10<(d4m+d4s) / R9<3.

50.

8. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; and a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The outer diameter D4m of the image side surface of the fourth spacing element, the inner diameter d3m of the image side surface of the third spacing element, and the combined focal length f34 of the third lens and the fourth lens satisfy: 0.10<(D4m-d3m) / f34<0.

40.

9. The optical imaging system according to claim 1, characterized in that: The combined focal length f12 of the first lens and the second lens, the curvature radius R1 of the object side surface of the first lens, and the center thickness CT2 of the second lens on the optical axis satisfy: 0.10 <f12 / R1×(d1s / CT2)<2.10。 10. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a fourth spacer element, located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The inner diameter d4s of the object side surface of the fourth spacer element, the curvature radius R8 of the image side surface of the fourth lens, the outer diameter D4m of the image side surface of the fourth spacer element and the curvature radius R9 of the object side surface of the fifth lens satisfy: 1.00 <d4s / R8×(D4m / R9)<1.90。 11. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; The distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis, the axial distance SAG22 from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens, and the air interval T23 between the second lens and the third lens on the optical axis satisfy: 0.40 <EP23 / (SAG22+T23)<2.60。 12. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; and a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens; The distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element on the optical axis and the on-axis distance SAG32 from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens satisfy: 0.80 <EP23 / SAG32<4.00。 13. The optical imaging system according to claim 1, characterized in that: The spacer element group further includes: a fourth spacer element, located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens; The inner diameter d4s of the object side surface of the fourth spacer element, the axial distance SAG41 from the intersection of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens, and the axial distance SAG42 from the intersection of the image side surface of the fourth lens and the optical axis to the effective radius vertex of the image side surface of the fourth lens satisfy: 4.50 <d4s / (SAG41+SAG42)<8.70。 14. An optical imaging system, characterized in that The invention comprises a lens barrel and a lens group and a spacer element group accommodated in the lens barrel, wherein: The inner annular surface of the lens barrel is in a stepped shape, and the opening size of the lens barrel decreases from the object side end surface to the image side end surface; The lens group includes, in order from the object side to the image side along the optical axis: A first lens having negative optical power, whose image side surface is concave; A second lens having positive refractive power and a convex image-side surface; The third lens has positive power, and its object-side surface is convex and its image-side surface is convex; a fourth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is concave; and a fifth lens having positive refractive power and a convex object side surface; There is an air gap between any two adjacent lenses from the first lens to the fifth lens; The spacer element group includes at least: a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens; a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens; The optical imaging system satisfies: -3.00 < f2 / f1 < -2.00 and 1.10 < (EP12 - EP01) / T12 < 2.20, wherein, f2 is the effective focal length of the second lens, f1 is the effective focal length of the first lens, EP12 is the distance on the optical axis from the image side surface of the first spacer element to the object side surface of the second spacer element, EP01 is the distance on the optical axis from the object side end surface of the lens barrel to the object side surface of the first spacer element, and T12 is the air space on the optical axis between the first lens and the second lens.

Images