CN219997401U

CN219997401U - Optical system assembly

Info

Publication number: CN219997401U
Application number: CN202321234047.5U
Authority: CN
Inventors: 潘文超; 刘锴; 张梦; 张变; 戴付建; 赵烈烽
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2023-05-19
Filing date: 2023-05-19
Publication date: 2023-11-10
Anticipated expiration: 2033-05-19

Abstract

The application discloses an optical system assembly. The optical system assembly includes a lens group, a plurality of spacers, and a barrel for accommodating the lens group and the plurality of spacers. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which have optical power from an object side to an image side along an optical axis, wherein the fourth lens has positive optical power, the fifth lens has negative optical power, and the curvature radiuses of the object side and the image side of the fifth lens are both larger than zero; the at least one spacer includes a fourth spacer located on an image side of the fourth lens and in contact with an image side portion of the fourth lens. The optical system component satisfies: -5 < D0m/f5 < 0, 0 < D0m/R10 < 15 and 0mm < r9× (d4s+d4s)/f 4 < 33mm.

Description

Optical system assembly

Technical Field

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

Background

In recent years, as mobile electronic devices are continuously updated and iterated, related industries are continuously optimized and upgraded, such as the most representative mobile phone industry, are promoted. Meanwhile, as the mobile phone industry is continuously optimized and upgraded, the optical system component carried on the mobile phone is driven to be continuously and iteratively upgraded, and the camera shooting technology of the mobile phone becomes one of main factors for improving the competitiveness of the mobile phone.

However, in the optical system component, there is often a phenomenon such as more stray light. In this case, more parasitic light may seriously degrade the imaging quality of the optical system component. Therefore, how to improve the imaging quality of the optical system components is important.

Disclosure of Invention

An aspect of the present utility model provides an optical system assembly including, in order from an object side to an image side along an optical axis, a lens group, at least one spacer, and a lens barrel for accommodating the lens group and the at least one spacer. The lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which have optical power from an object side to an image side along an optical axis, wherein the fourth lens has positive optical power, the fifth lens has negative optical power, and the curvature radiuses of the object side and the image side of the fifth lens are larger than zero. The at least one spacer includes a fourth spacer located on an image side of the fourth lens and in contact with an image side portion of the fourth lens. The optical system component can satisfy: -5 < D0m/f5 < 0, 0 < D0m/R10 < 15, and 0mm < r9× (d4s+d4s)/f 4 < 33mm, wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, R9 is the radius of curvature of the object side of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, D4s is the inner diameter of the object side of the fourth spacer, D4s is the outer diameter of the object side of the fourth spacer, D0m is the outer diameter of the image side end of the barrel, and D0m is the inner diameter of the image side end of the barrel.

In one embodiment, at least one of the object-side surface of the first lens to the image-side surface of the fifth lens is an aspherical mirror surface.

In one embodiment, the at least one spacer further comprises a first spacer located on the image side of the first lens and in contact with the image side portion of the first lens. The optical system component can satisfy: semi-FOV > 45 DEG and 0 < TAN (Semi-FOV). Times.f/(D1 s-D1 s) < 15, where f is the total effective focal length of the optical system assembly, semi-FOV is half the maximum field angle of the optical system assembly, D1s is the inner diameter of the object side of the first spacer, and D1s is the outer diameter of the object side of the first spacer.

In one embodiment, the optical system component may satisfy: -55 < R2/d0s-f1/EP01 < 0, wherein f1 is the effective focal length of the first lens, EP01 is the distance from the object side end of the barrel to the object side surface of the first spacer in the direction along the optical axis, R2 is the radius of curvature of the image side surface of the first lens, and d0s is the inner diameter of the object side end of the barrel.

In one embodiment, the optical system component may satisfy: 0 < f2/D1m x R1/D1m < 15, wherein D1m is the inner diameter of the image side surface of the first spacer, D1m is the outer diameter of the image side surface of the first spacer, R1 is the radius of curvature of the object side surface of the first lens, and f2 is the effective focal length of the second lens.

In one embodiment, the at least one spacer further comprises a third spacer located on the image side of the third lens and in contact with the image side portion of the third lens. The optical system component can satisfy: 8 < (f3×N3+f4×N4)/EP 34 < 32, wherein f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, N3 is a refractive index of the third lens, N4 is a refractive index of the fourth lens, and EP34 is a separation distance in a direction along the optical axis from an image side surface of the third spacer to an object side surface of the fourth spacer.

In one embodiment, the at least one spacer further comprises a second spacer located on the image side of the second lens and in contact with the image side portion of the second lens. The optical system component can satisfy: -50 < (r4+r6)/(D2 s-D3 s) < -6, wherein R4 is the radius of curvature of the image side of the second lens, R6 is the radius of curvature of the image side of the third lens, D2s is the outer diameter of the object side of the second spacer, and D3s is the inner diameter of the object side of the third spacer.

In one embodiment, the optical system component may satisfy: 22mm < (R7-R5). Times.EP 34/T34 < 0mm, where R5 is the radius of curvature of the object side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, EP34 is the distance between the image side of the third spacer and the object side of the fourth spacer in the direction along the optical axis, and T34 is the air separation of the third lens and the fourth lens on the optical axis.

In one embodiment, the optical system component may satisfy: 15mm of ^-1 ＜V2/d3m+V3/D3m＜30mm ^-1 Where V2 is the abbe number of the second lens, V3 is the abbe number of the third lens, D3m is the inner diameter of the image side surface of the third spacer, and D3m is the outer diameter of the image side surface of the third spacer.

In one embodiment, the at least one spacer further includes an auxiliary spacer located at an image side of the fourth spacer and in contact with an image side portion of the fourth spacer. The optical system component can satisfy: 30mm < (D4 bm-D4 bm) ×CT5/CP4b < 92mm, where D4bm is the inner diameter of the image side surface of the auxiliary spacer, D4bm is the outer diameter of the image side surface of the auxiliary spacer, CT5 is the center thickness of the fifth lens on the optical axis, and CP4b is the maximum thickness of the auxiliary spacer.

In one embodiment, the optical system component may satisfy: 2 < (d3s+d4s)/(CP 3+ep34+ct 4) < 12, wherein D3s is the outer diameter of the object side surface of the third spacer, D4s is the outer diameter of the object side surface of the fourth spacer, CT4 is the center thickness of the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer, and EP34 is the distance between the image side surface of the third spacer and the object side surface of the fourth spacer in the direction along the optical axis.

In one embodiment, the first lens has positive optical power; and the second lens has negative optical power.

In one embodiment, the refractive index of all of the first to fifth lenses is greater than 1.5; and the number of lenses having positive optical power among the first to fifth lenses is greater than the number of lenses having negative optical power.

In the exemplary embodiment of the application, the five lenses, the spacer and the lens barrel are reasonably matched, and the focal power and the curvature radius of the fourth lens and the fifth lens and the key technical parameters of the optical system component such as-5 < D0m/f5 < 0, 0 < D0m/R10 < 15 and 0mm < R9× (D4s+d4s)/f 4 < 33mm are reasonably arranged, so that the optical system component provided by the application has the characteristics of less stray light, higher imaging quality and the like. For example, the application can effectively intercept redundant light and avoid stray light by arranging the inner diameter and the outer diameter of the side surface of the fourth separator; by setting the curvature radius of the fifth lens, the incidence direction of the light entering the fifth lens and the emergent direction after passing through the fifth lens can be controlled, so that the imaging effect on the imaging surface is improved, the structure of the fifth lens can be controlled, and the fifth lens is prevented from exceeding the external dimension of the lens barrel; by controlling the optical power of the fourth lens and the fifth lens, a large aperture effect can be achieved; the number of incident light rays entering the optical system component and the number of emergent light rays exiting the optical system component can be controlled by controlling the inner diameter and the outer diameter of the image side end of the lens barrel, so that stray light in the component is reduced, and the imaging effect is improved.

Drawings

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

fig. 1A to 1C are schematic structural views of an optical system assembly in three embodiments of example 1, respectively;

fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical system component of embodiment 1;

fig. 3A to 3C are schematic structural views of optical system components in three embodiments of example 2, respectively;

fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical system component of embodiment 2;

fig. 5A to 5C are schematic structural views of optical system components in three embodiments of example 3, respectively;

fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the optical system component of embodiment 3; and

FIG. 7 is a schematic view of a portion of parameters of an optical system assembly according to an embodiment of the application.

Detailed Description

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

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

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

Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens. It should be understood that the surface of each spacer closest to the subject is referred to as the object side of the spacer, and the surface of each spacer closest to the imaging plane is referred to as the image side of the spacer. The surface of the lens barrel closest to the object is referred to as the object side end of the lens barrel, and the surface of the lens barrel closest to the imaging surface is referred to as the image side end of the lens barrel.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.

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

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following examples merely illustrate a few embodiments of the present application, which are described in greater detail and are not to be construed as limiting the scope of the application. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which are all within the scope of the present application, for example, the lens group (i.e., the first lens to the fifth lens) of each embodiment of the present application, the lens barrel structure, and the spacer may be arbitrarily combined, and the lens group of one embodiment is not limited to be combined with the lens barrel structure, the spacer, and the like of the embodiment. The application will be described in detail below with reference to the drawings in connection with embodiments.

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

An optical system assembly according to an exemplary embodiment of the present application may include five lenses having optical power, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, respectively. The five lenses are arranged in order from the object side to the image side along the optical axis. Any two adjacent lenses in the first lens to the fifth lens can have a spacing distance. Any of the first to fifth lenses may have a center thickness on the optical axis.

According to an exemplary embodiment of the present application, each of the first to fifth lenses may have an optical region for optical imaging and a non-optical region extending outward from an outer circumference of the optical region. In general, an optical region refers to a region of a lens for optical imaging, and a non-optical region is a structural region of the lens. In the assembly process of the optical system assembly, spacers may be provided at the non-optical regions of the respective lenses by a process such as spot gluing and the respective lenses may be coupled into the lens barrels, respectively. During imaging of the optical system assembly, the optical regions of each lens can transmit light from the object to form an optical path, forming a final optical image; the non-optical areas of the assembled lenses are accommodated in the lens barrel which cannot transmit light, so that the non-optical areas do not directly participate in the imaging process of the optical system assembly. It should be noted that for ease of description, the application is described with the individual lenses being divided into two parts, an optical region and a non-optical region, but it should be understood that both the optical region and the non-optical region of the lens may be formed as a single piece during manufacture rather than as separate two parts.

An optical system assembly according to an exemplary embodiment of the present application may include at least one spacer, and for example, may include at least one of a first spacer, a second spacer, a third spacer, a fourth spacer, and an auxiliary spacer. For example, the first spacer may be located at the image side of the first lens and in contact with the image side portion of the first lens, which may abut against the non-optical region of the image side of the first lens. The second spacer may be located at the image side of the second lens and in contact with the image side portion of the second lens, which may abut against the non-optical region of the image side of the second lens. The third spacer may be located at the image side of the third lens and in contact with the image side portion of the third lens, which may abut against the non-optical region of the image side of the third lens. The fourth spacer may be located on the image side of the fourth lens and in contact with the image side portion of the fourth lens, which may abut against the non-optical region of the image side of the fourth lens. The auxiliary spacer may be located at an image side of the fourth spacer and in contact with an image side portion of the fourth spacer, which may abut at the image side of the fourth spacer. For example, the first spacer may be in contact with the non-optical region of the image side of the first lens and may be in contact with the non-optical region of the object side of the second lens. For example, the object-side surface of the first spacer may be in contact with the non-optical region of the image-side surface of the first lens, and the image-side surface of the first spacer may be in contact with the non-optical region of the object-side surface of the second lens.

In an exemplary embodiment of the present application, the optical system assembly may include a second auxiliary spacer located at the image side of the second spacer and in contact with the image side portion of the second spacer, which may abut at the image side of the second spacer.

An optical system assembly according to an exemplary embodiment of the present application may include a lens barrel accommodating a lens group and a plurality of spacers. As illustrated in fig. 1A to 1C, the lens barrel may be an integrated lens barrel for accommodating the first to fifth lenses and the first to auxiliary spacers, for example.

According to the exemplary embodiment of the application, the spacer can comprise at least one spacer, and the number, thickness, inner diameter and outer diameter of the spacer are reasonably arranged, so that the assembly of the optical system component is improved, stray light is shielded, and the imaging quality of the optical system component is improved.

In an exemplary embodiment, the fourth lens has positive optical power, the fifth lens has negative optical power, and the radii of curvature of both the object-side and image-side surfaces of the fifth lens are greater than zero. The optical system component according to the present application can satisfy: -5 < D0m/f5 < 0, 0 < D0m/R10 < 15, and 0mm < r9× (d4s+d4s)/f 4 < 33mm, wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, R9 is the radius of curvature of the object side of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, D4s is the inner diameter of the object side of the fourth spacer, D4s is the outer diameter of the object side of the fourth spacer, D0m is the outer diameter of the image side end of the barrel, and D0m is the inner diameter of the image side end of the barrel.

In the application, the five lenses, the separating piece and the lens barrel are reasonably matched, and the focal power and the curvature radius of the fourth lens and the fifth lens and the key technical parameters of the optical system component such as-5 < D0m/f5 < 0, 0 < D0m/R10 < 15 and 0mm < R9× (D4s+d4s)/f 4 < 33mm are reasonably arranged, so that the optical system component provided by the application has the characteristics of less parasitic light, higher imaging quality and the like. For example, the application can effectively intercept redundant light and avoid stray light by arranging the inner diameter and the outer diameter of the side surface of the fourth separator; by setting the curvature radius of the fifth lens, the incidence direction of the light entering the fifth lens and the emergent direction after passing through the fifth lens can be controlled, so that the imaging effect on the imaging surface is improved, the structure of the fifth lens can be controlled, and the fifth lens is prevented from exceeding the external dimension of the lens barrel; by controlling the optical power of the fourth lens and the fifth lens, a large aperture effect can be achieved; the number of incident light rays entering the optical system component and the number of emergent light rays exiting the optical system component can be controlled by controlling the inner diameter and the outer diameter of the image side end of the lens barrel, so that stray light in the component is reduced, and the imaging effect is improved.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: semi-FOV > 45 DEG and 0 < TAN (Semi-FOV). Times.f/(D1 s-D1 s) < 15, where f is the total effective focal length of the optical system assembly, semi-FOV is half the maximum field angle of the optical system assembly, D1s is the inner diameter of the object side of the first spacer, and D1s is the outer diameter of the object side of the first spacer. Satisfy semiFOV > 45 and 0 < TAN (semiFOV). Times.f/(D1 s-D1 s) < 15, can make the optical system assembly have wide angle characteristic by controlling half of the maximum field angle, and then can increase the quantity of incident light rays exiting the optical system assembly, simultaneously through controlling the difference of the inner and outer diameters of the object side surface of the first spacer, can reduce the risk that the first spacer has long cantilever, and the like, in addition, through controlling the inner diameter of the first spacer, can effectively shield the stray light rays entering the second lens, and then can improve the imaging quality.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: -55 < R2/d0s-f1/EP01 < 0, wherein f1 is the effective focal length of the first lens, EP01 is the distance from the object side end of the barrel to the object side surface of the first spacer in the direction along the optical axis, R2 is the radius of curvature of the image side surface of the first lens, and d0s is the inner diameter of the object side end of the barrel. Satisfies-55 < R2/d0s-f1/EP01 < 0, can effectively improve the effect of controlling light directional reflection of the first lens by controlling the distance from the object side end of the lens barrel to the object side surface of the first separator on the optical axis so as to reduce stray light and the like in the assembly, can adjust the quantity of light entering the first lens by controlling the inner diameter of the object side end of the lens barrel, can reduce the deflection degree of the light in the first lens by controlling the curvature radius of the image side surface of the first lens, and effectively reduces the sensitivity of the first lens.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: 0 < f2/D1m x R1/D1m < 15, wherein D1m is the inner diameter of the image side surface of the first spacer, D1m is the outer diameter of the image side surface of the first spacer, R1 is the radius of curvature of the object side surface of the first lens, and f2 is the effective focal length of the second lens. Satisfies 0 < f2/D1m x R1/D1m < 15, the light quantity entering the first lens can be controlled by controlling the curvature radius of the object side surface of the first lens so as to reduce the redundant stray light entering the assembly, and meanwhile, the incident light trend can be reasonably controlled by controlling the inner and outer diameters of the image side surface of the first separator so as to effectively reduce the stray light phenomenon.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: 8 < (f3×N3+f4×N4)/EP 34 < 32, wherein f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, N3 is a refractive index of the third lens, N4 is a refractive index of the fourth lens, and EP34 is a separation distance in a direction along the optical axis from an image side surface of the third spacer to an object side surface of the fourth spacer. The optical lens assembly satisfies the condition that (f3×N3+f4×N4)/EP 34 is less than 32, distortion generated by the third lens and the fourth lens can be controlled within a reasonable range by controlling the effective focal length and the refractive index of the third lens and the fourth lens, and meanwhile, the light ray intake and emission paths can be regulated and controlled by controlling the distance from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: -50 < (r4+r6)/(D2 s-D3 s) < -6, wherein R4 is the radius of curvature of the image side of the second lens, R6 is the radius of curvature of the image side of the third lens, D2s is the outer diameter of the object side of the second spacer, and D3s is the inner diameter of the object side of the third spacer. For example, a large-level difference structure may exist between the second lens and the third lens, so that-50 < (R4+R6)/(D2 s-D3 s) < -6 is satisfied, and the outer diameter of the third lens and the inner diameter of the third spacer can be reasonably set by setting the inner diameter and the outer diameter of the second spacer to improve the efficiency of intercepting stray light, and meanwhile, the curvature radius of the lens in a reasonable range is matched, so that the light trend can be effectively controlled to improve the final imaging quality.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: 22mm < (R7-R5). Times.EP 34/T34 < 0mm, where R5 is the radius of curvature of the object side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, EP34 is the distance between the image side of the third spacer and the object side of the fourth spacer in the direction along the optical axis, and T34 is the air separation of the third lens and the fourth lens on the optical axis. The lens structure can be optimized by controlling the distance from the image side surface of the third isolation piece to the side surface of the fourth isolation piece along the optical axis, and the lens structure can be optimized and the imaging quality can be improved by controlling the air interval between the third lens and the fourth lens.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: 15mm of ^-1 ＜V2/d3m+V3/D3m＜30mm ^-1 Where V2 is the abbe number of the second lens, V3 is the abbe number of the third lens, D3m is the inner diameter of the image side surface of the third spacer, and D3m is the outer diameter of the image side surface of the third spacer. The method meets the following conditions: 15mm of ^-1 ＜V2/d3m+V3/D3m＜30mm ^-1 The Abbe number of the second lens and the third lens can be controlled to reduce the dispersion degree of light rays in the second lens and the third lens, and meanwhile, the third spacer can absorb redundant diffraction stray light and reasonably adjust the structure of the optical system component by controlling the inner diameter and the outer diameter of the image side surface of the third spacer.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: 30mm < (D4 bm-D4 bm) ×CT5/CP4b < 92mm, where D4bm is the inner diameter of the image side surface of the auxiliary spacer, D4bm is the outer diameter of the image side surface of the auxiliary spacer, CT5 is the center thickness of the fifth lens on the optical axis, and CP4b is the maximum thickness of the auxiliary spacer. The lens barrel has the advantages that the lens barrel meets the requirement that the diameter of the lens barrel is less than 30mm (D4 bm-D4 bm) x CT5/CP4b is less than 92mm, not only can the auxiliary isolating piece effectively block stray light, but also the center thickness and the outer diameter size of the fifth lens can be controlled, thereby being beneficial to controlling the inner diameter size of the image side end of the lens barrel and improving the uniformity of the wall thickness of the lens barrel.

In an exemplary embodiment, the optical system assembly according to the present application may satisfy: 2 < (d3s+d4s)/(CP 3+ep34+ct 4) < 12, wherein D3s is the outer diameter of the object side surface of the third spacer, D4s is the outer diameter of the object side surface of the fourth spacer, CT4 is the center thickness of the fourth lens on the optical axis, CP3 is the maximum thickness of the third spacer, and EP34 is the distance between the image side surface of the third spacer and the object side surface of the fourth spacer in the direction along the optical axis. The lens barrel has the advantages that the lens barrel satisfies the requirement that 2 < (D3s+D4s)/(CP3+EP 34+CT4) < 12, the structures of the fourth lens and the fifth lens can be indirectly controlled by controlling the outer diameters of the object side surfaces of the third isolation piece and the fourth isolation piece, so that the optical system component has the aperture with reasonable size, the uniform and tough wall thickness of the lens barrel is ensured, the deformation of the lens barrel is prevented, and meanwhile, the forming feasibility of the lens is favorably controlled by controlling the sum of the thickness of the third isolation piece, the thickness of the center of the fourth lens on the optical axis and the distance from the image side surface of the third isolation piece to the object side surface of the fourth isolation piece along the optical axis.

In an exemplary embodiment, the first lens may have positive optical power; and the second lens may have negative optical power. The application can control the deflection capability of the first lens and the second lens to light by reasonably setting the focal power of the first lens and the second lens, for example, can control the first lens to have converging effect to light and the second lens to have diverging effect to light, so that the light can pass through each lens as far as possible according to a preset path and finally be imaged on an imaging surface.

In an exemplary embodiment, the refractive index of all of the first to fifth lenses may be greater than 1.5; and the number of lenses having positive optical power among the first to fifth lenses may be greater than the number of lenses having negative optical power. The application is beneficial to improving the refractive index of each lens and controlling the thickness of the center and the edge of each lens by reasonably distributing the refractive index and the focal power of each lens, thereby facilitating the structural arrangement of each lens.

In an exemplary embodiment, the optical system assembly according to the present application further comprises a stop arranged between the object side and the first lens. Optionally, the optical system assembly may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element located on the imaging surface. The application provides an optical system component with the characteristics of less stray light, high stability, high yield, high imaging quality and the like. The optical system assembly according to the above embodiment of the present application may employ a plurality of lenses, for example, the above five lenses. By reasonably distributing the focal power, the surface shape, the material, the center thickness of each lens, the axial spacing between each lens and the like of each lens, incident light rays can be effectively converged, the total optical length of the optical system component is reduced, and the processability of the optical system component is improved, so that the optical system component is more beneficial to production and processing. In the optical system assembly according to the embodiment of the application, the spacer is arranged between the adjacent lenses and the inner diameter and the outer diameter of the spacer are designed according to the optical path, so that stray light can be effectively shielded and eliminated, and the imaging quality of the optical system assembly can be improved.

In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, i.e., at least one of the object side surface of the first lens to the image side surface of the fifth lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens, the second lens, the third lens, the fourth lens, and the fifth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are aspherical mirror surfaces.

However, those skilled in the art will appreciate that the number of lenses making up an optical system assembly can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although the description is given by taking five lenses as an example in the embodiment, the optical system assembly is not limited to include five lenses. The optical system assembly may also include other numbers of lenses, if desired.

Specific examples of optical system components applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

Example 1

An optical system assembly according to embodiment 1 of the present application is described below with reference to fig. 1A to 2D. Fig. 1A to 1C show optical system components in three embodiments in example 1, respectively.

As shown in fig. 1A to 1C, the optical system assembly sequentially includes, from an object side to an image side: stop STO (not shown), first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter (not shown), and imaging plane (not shown).

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave and an image-side surface S4 thereof is convex. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The filter has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane.

Table 1 shows the basic parameter table of the optical system component of example 1, in which the unit of radius of curvature, thickness/distance, and focal length are all millimeters (mm).

TABLE 1

In this example, half of the maximum field angle of the optical system assembly has a Semi-FOV of 49.5000 deg., and the total effective focal length f of the optical system assembly is 2.4869mm.

As shown in fig. 1A, the optical system assembly may include four spacers, namely, a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The lens barrel may accommodate the first to fifth lenses E1 to E5 and the first to fourth spacers P1 to P4.

As shown in fig. 1B, the optical system assembly may include five spacers, namely, a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and an auxiliary spacer P4B. The lens barrel may accommodate the first to fifth lenses E1 to E5 and the first to auxiliary spacers P1 to P4b.

As shown in fig. 1C, the optical system assembly may include six spacers, namely, a first spacer P1, a second spacer P2, a second auxiliary spacer P2b, a third spacer P3, a fourth spacer P4, and an auxiliary spacer P4b. The lens barrel may accommodate the first to fifth lenses E1 to E5 and the first to auxiliary spacers P1 to P4b.

Table 2 shows basic parameter tables of each spacer in three embodiments in the optical system assembly of example 1, wherein each basic parameter is in millimeters (mm).

Structural parameters	Embodiment 1	Embodiment 2	Embodiment 3
				d1s	1.3535	1.5193	1.5193
d1m	1.3535	1.5193	1.5193
				D1s	2.2977	2.2977	2.2977
D1m	2.2977	2.2977	2.2977
				D2s	3.8778	3.8778	3.2854
d3s	2.6552	2.7544	2.8874
				d3m	2.6552	2.7544	2.8874
D3s	4.3379	4.2354	4.2354
				D3m	4.3379	4.2354	4.2354
d4s	3.2839	3.6661	3.9409
				D4s	6.0927	5.0112	5.2102
d0s	1.6434	1.6434	1.6434
				d0m	6.9560	6.9560	6.9560
D0m	7.6644	7.6644	7.6644
				EP01	0.6959	0.6767	0.6767
CP3	0.0180	0.0220	0.0300
				EP34	0.7538	0.5463	0.5039
d4bm	/	3.7003	3.9130
				D4bm	/	6.0927	6.0927
CP4b	/	0.0180	0.0180

TABLE 2

It should be understood that in this example, the structures and parameters of each separator in the three embodiments are merely exemplified, and the specific structures and actual parameters of each separator are not explicitly defined. The specific structure and actual parameters of each spacer may be set in any suitable manner in actual production.

In embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical, and the surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the repair of the i-th order of the aspherical surfacePositive coefficients. Table 3 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S10 in example 1 ₄ 、A ₆ 、A ₈ 、A ₁₀ 、A ₁₂ 、A ₁₄ 、A ₁₆ 、A ₁₈ And A ₂₀ 。

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.3869E-02

-1.3208E-03

-1.3555E-04

-5.2334E-06

-5.3855E-07

2.7379E-06

2.0511E-06

2.5435E-06

-6.9577E-07

S2

-2.9973E-02

-1.9913E-03

-9.3997E-05

9.6284E-06

-7.1223E-07

-5.4794E-07

-1.7638E-06

1.0152E-06

1.5519E-06

S3

-6.2952E-02

-3.4004E-03

8.3649E-05

3.8089E-04

5.4548E-06

3.4843E-05

-9.8574E-06

1.3649E-06

-3.7043E-06

S4

-1.3570E-01

1.4919E-02

-6.2387E-03

2.2229E-03

-5.6796E-04

2.9983E-04

-9.9198E-05

2.2456E-05

-1.1441E-05

S5

-2.1446E-01

2.4601E-02

-7.9900E-03

3.1487E-03

-3.9249E-04

3.2311E-04

-1.2958E-04

4.5143E-07

-1.3652E-05

S6

-2.4351E-01

-5.1753E-03

2.0741E-03

3.8154E-03

1.3162E-03

2.3900E-04

-1.2123E-04

-8.2396E-05

-6.7594E-05

S7

-2.9528E-02

5.2903E-03

8.4390E-03

-3.3017E-03

-1.2094E-03

-9.2098E-04

-3.6399E-04

1.8949E-04

1.0525E-04

S8

3.1373E-01

6.3611E-02

1.1967E-02

-1.7275E-02

-1.6098E-03

1.4550E-03

6.6824E-04

-4.8680E-05

4.4544E-05

S9

-2.6607E+00

5.2652E-01

-1.0337E-01

1.7992E-02

7.5743E-04

-5.8985E-03

3.8794E-03

-1.8138E-03

4.7455E-04

S10

-6.2785E+00

1.2191E+00

-3.7521E-01

1.4201E-01

-5.2981E-02

1.7993E-02

-7.4009E-03

1.7751E-03

-1.0651E-03

TABLE 3 Table 3

Fig. 2A shows an on-axis chromatic aberration curve of the optical system assembly of embodiment 1, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical system assembly. Fig. 2B shows an astigmatism curve of the optical system component of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the optical system component of embodiment 1, which represents distortion magnitude values corresponding to different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the optical system assembly of embodiment 1, which represents the deviation of different image heights on the imaging plane after the light passes through the optical system assembly. As can be seen from fig. 2A to 2D, the optical system assembly according to embodiment 1 can achieve good imaging quality.

Example 2

An optical system assembly according to embodiment 2 of the present application is described below with reference to fig. 3A to 4D. In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3A to 3C show the optical system components in the three embodiments in example 1, respectively.

As shown in fig. 3A to 3C, the optical system assembly sequentially includes, from an object side to an image side: stop STO (not shown), first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter (not shown), and imaging plane (not shown).

In this example, half of the maximum field angle of the optical system assembly has a Semi-FOV of 46.0000 deg., and the total effective focal length f of the optical system assembly is 2.4840mm.

As shown in fig. 3A, the optical system assembly may include four spacers, namely, a first spacer P1, a second spacer P2, a third spacer P3, and a fourth spacer P4. The lens barrel may accommodate the first to fifth lenses E1 to E5 and the first to fourth spacers P1 to P4.

As shown in fig. 3B and 3C, the optical system assembly may include five spacers, namely, a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, and an auxiliary spacer P4B. The lens barrel may accommodate the first to fifth lenses E1 to E5 and the first to auxiliary spacers P1 to P4b.

Table 4 shows the basic parameter table of the optical system assembly of example 2, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 5 shows basic parameter tables for each spacer in three embodiments in the optical system assembly of example 2, wherein each basic parameter is in millimeters (mm). Table 6 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 4 Table 4

TABLE 5

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.3732E-02

-1.3077E-03

-1.3420E-04

-5.1816E-06

-5.3322E-07

2.7107E-06

2.0308E-06

2.5183E-06

-6.8888E-07

S2

-2.9676E-02

-1.9716E-03

-9.3066E-05

9.5330E-06

-7.0518E-07

-5.4251E-07

-1.7463E-06

1.0051E-06

1.5366E-06

S3

-6.2329E-02

-3.3667E-03

8.2821E-05

3.7712E-04

5.4008E-06

3.4498E-05

-9.7598E-06

1.3514E-06

-3.6677E-06

S4

-1.3435E-01

1.4771E-02

-6.1769E-03

2.2009E-03

-5.6234E-04

2.9686E-04

-9.8216E-05

2.2234E-05

-1.1328E-05

S5

-2.1233E-01

2.4357E-02

-7.9109E-03

3.1175E-03

-3.8861E-04

3.1991E-04

-1.2830E-04

4.4696E-07

-1.3516E-05

S6

-2.4110E-01

-5.1241E-03

2.0535E-03

3.7776E-03

1.3031E-03

2.3663E-04

-1.2003E-04

-8.1580E-05

-6.6925E-05

S7

-2.9236E-02

5.2380E-03

8.3555E-03

-3.2690E-03

-1.1975E-03

-9.1186E-04

-3.6039E-04

1.8761E-04

1.0421E-04

S8

3.1063E-01

6.2981E-02

1.1848E-02

-1.7104E-02

-1.5939E-03

1.4406E-03

6.6163E-04

-4.8198E-05

4.4103E-05

S9

-2.6343E+00

5.2131E-01

-1.0235E-01

1.7814E-02

7.4993E-04

-5.8401E-03

3.8410E-03

-1.7959E-03

4.6985E-04

S10

-6.2163E+00

1.2070E+00

-3.7149E-01

1.4060E-01

-5.2457E-02

1.7815E-02

-7.3276E-03

1.7575E-03

-1.0545E-03

TABLE 6

Fig. 4A shows an on-axis chromatic aberration curve of the optical system assembly of embodiment 2, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical system assembly. Fig. 4B shows an astigmatism curve of the optical system component of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the optical system component of embodiment 2, which represents distortion magnitude values corresponding to different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the optical system assembly of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the optical system assembly. As can be seen from fig. 4A to 4D, the optical system assembly according to embodiment 2 can achieve good imaging quality.

Example 3

An optical system assembly according to embodiment 3 of the present application is described below with reference to fig. 5A to 6D. Fig. 5A to 5C show the optical system components in the three embodiments in example 3, respectively.

As shown in fig. 5A to 5C, the optical system assembly sequentially includes, from an object side to an image side: stop STO (not shown), first lens E1, second lens E2, third lens E3, fourth lens E4, fifth lens E5, filter (not shown), and imaging plane (not shown).

The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is concave. The fourth lens element E4 has positive refractive power, wherein an object-side surface S7 thereof is concave and an image-side surface S8 thereof is convex. The fifth lens element E5 has negative refractive power, wherein an object-side surface S9 thereof is convex and an image-side surface S10 thereof is concave. The filter has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging plane.

In this example, half of the maximum field angle of the optical system assembly has a Semi-FOV of 51.5000 deg., and the total effective focal length f of the optical system assembly is 2.7311mm.

As shown in fig. 5A and 5B, the optical system assembly may include four spacers, namely, a first spacer P1, a third spacer P3, a fourth spacer P4, and an auxiliary spacer P4B. The lens barrel may accommodate the first to fifth lenses E1 to E5 and the first to auxiliary spacers P1 to P4b.

As shown in fig. 5C, the optical system assembly may include three spacers, namely, a first spacer P1, a third spacer P3, and a fourth spacer P4. The lens barrel may accommodate the first to fifth lenses E1 to E5 and the first to fourth spacers P1 to P4.

Table 7 shows the basic parameter table of the optical system component of example 3, in which the unit of radius of curvature, thickness/distance, and focal length are all millimeters (mm). Table 8 shows basic parameter tables for each spacer of the three embodiments in the optical system assembly of example 3, wherein each basic parameter is in millimeters (mm). Table 9 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.

TABLE 7

TABLE 8

Face number

A4

A6

A8

A10

A12

A14

A16

A18

A20

S1

-1.7428E-02

-1.8369E-03

-1.6920E-04

2.2369E-05

2.4210E-05

1.8526E-05

8.6195E-06

2.8039E-06

-1.8097E-06

S2

-3.6983E-02

-2.6704E-03

-1.0115E-04

3.7072E-05

1.9112E-05

1.6230E-05

1.1729E-05

9.5255E-06

4.0366E-06

S3

-7.6500E-02

-3.8117E-03

6.5876E-04

6.2680E-04

8.7331E-06

6.1039E-06

-4.3974E-05

-1.3800E-05

-9.6351E-06

S4

-1.5577E-01

1.6150E-02

-6.7826E-03

2.9501E-03

-7.0491E-04

2.9141E-04

-2.1492E-04

4.1314E-07

-2.9758E-05

S5

-2.4398E-01

2.8592E-02

-8.0544E-03

4.4168E-03

-6.7078E-04

9.5850E-05

-3.7867E-04

-6.1658E-05

-3.5508E-05

S6

-2.8552E-01

1.8249E-03

9.1299E-03

6.7206E-03

7.9553E-04

-1.0994E-03

-1.0770E-03

-5.0495E-04

-1.7581E-04

S7

-3.2905E-02

5.6131E-03

3.4570E-03

-8.7940E-03

-2.9364E-03

-6.6028E-04

7.1328E-04

9.2592E-04

2.7282E-04

S8

4.0430E-01

7.5696E-02

2.6640E-04

-2.2167E-02

3.5292E-03

4.9393E-03

1.5639E-03

8.5948E-05

1.1437E-04

S9

-2.8981E+00

6.0622E-01

-1.2969E-01

2.2934E-02

-3.1227E-03

-5.3308E-03

4.9542E-03

-2.1237E-03

1.1535E-03

S10

-6.9070E+00

1.3453E+00

-4.4035E-01

1.4848E-01

-8.0008E-02

1.2861E-02

-1.6092E-02

-3.5891E-04

-2.6033E-03

TABLE 9

Fig. 6A shows an on-axis chromatic aberration curve of the optical system assembly of embodiment 3, which represents the deviation of the converging focus of light rays of different wavelengths after passing through the optical system assembly. Fig. 6B shows an astigmatism curve of the optical system component of embodiment 3, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the optical system component of embodiment 3, which represents distortion magnitude values corresponding to different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the optical system assembly of embodiment 3, which represents the deviation of different image heights on the imaging plane after light passes through the optical system assembly. As can be seen from fig. 6A to 6D, the optical system assembly according to embodiment 3 can achieve good imaging quality.

In summary, examples 1 to 3 satisfy the relationships shown in tables 10-1, 10-2 and 10-3, respectively.

TABLE 10-1

TABLE 10-2

TABLE 10-3

The application also provides an imaging device, wherein the electronic photosensitive element can be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the optical system assembly described above.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

1. An optical system assembly, comprising:

the lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which have optical power from an object side to an image side along an optical axis, wherein the fourth lens has positive optical power, the fifth lens has negative optical power, and the curvature radiuses of the object side and the image side of the fifth lens are larger than zero;

at least one spacer, comprising: a fourth spacer located on an image side of the fourth lens and in contact with an image side portion of the fourth lens; and

a lens barrel for accommodating the lens group and the at least one spacer;

Wherein the optical system component satisfies: -5 < D0m/f5 < 0, 0 < D0m/R10 < 15, and 0mm < r9× (d4s+d4s)/f 4 < 33mm, wherein f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, R9 is the radius of curvature of the object side of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, D4s is the inner diameter of the object side of the fourth spacer, D4s is the outer diameter of the object side of the fourth spacer, D0m is the outer diameter of the image side end of the barrel, and D0m is the inner diameter of the image side end of the barrel.

2. The optical system assembly of claim 1 wherein the at least one spacer further comprises a first spacer positioned on an image side of the first lens and in contact with an image side portion of the first lens,

the optical system component satisfies: semi-FOV > 45 DEG and 0 < TAN (Semi-FOV). Times.f/(D1 s-D1 s) < 15, where f is the total effective focal length of the optical system assembly, semi-FOV is half the maximum field angle of the optical system assembly, D1s is the inside diameter of the object side of the first spacer, and D1s is the outside diameter of the object side of the first spacer.

3. The optical system assembly of claim 1 wherein the at least one spacer further comprises a first spacer positioned on an image side of the first lens and in contact with an image side portion of the first lens,

The optical system component satisfies: -55 < R2/d0s-f1/EP01 < 0, wherein f1 is the effective focal length of the first lens, EP01 is the distance from the object side end of the barrel to the object side of the first spacer in the direction along the optical axis, R2 is the radius of curvature of the image side of the first lens, and d0s is the inner diameter of the object side end of the barrel.

4. The optical system assembly of claim 1 wherein the at least one spacer further comprises a first spacer positioned on an image side of the first lens and in contact with an image side portion of the first lens,

the optical system component satisfies: 0 < f2/D1m x R1/D1m < 15, wherein D1m is the inner diameter of the image side surface of the first spacer, D1m is the outer diameter of the image side surface of the first spacer, R1 is the radius of curvature of the object side surface of the first lens, and f2 is the effective focal length of the second lens.

5. The optical system assembly of claim 1 wherein the at least one spacer further comprises a third spacer positioned on the image side of the third lens and in contact with the image side portion of the third lens,

the optical system component satisfies: 8 < (f3×n3+f4×n4)/EP 34 < 32, wherein f3 is an effective focal length of the third lens, f4 is an effective focal length of the fourth lens, N3 is a refractive index of the third lens, N4 is a refractive index of the fourth lens, and EP34 is a separation distance in a direction along the optical axis from an image side surface of the third spacer to an object side surface of the fourth spacer.

6. The optical system assembly of claim 1 wherein the at least one spacer further comprises a second spacer positioned on the image side of the second lens and in contact with the image side portion of the second lens, and a third spacer positioned on the image side of the third lens and in contact with the image side portion of the third lens,

the optical system component satisfies: -50 < (r4+r6)/(D2 s-D3 s) < -6, wherein R4 is the radius of curvature of the image side of the second lens, R6 is the radius of curvature of the image side of the third lens, D2s is the outer diameter of the object side of the second spacer, and D3s is the inner diameter of the object side of the third spacer.

7. The optical system assembly of claim 1 wherein a third spacer positioned on an image side of the third lens and in contact with an image side portion of the third lens,

the optical system component satisfies: -22mm < (R7-R5) ×ep34/T34 < 0mm, wherein R5 is the radius of curvature of the object side of the third lens, R7 is the radius of curvature of the object side of the fourth lens, EP34 is the separation distance of the image side of the third spacer to the object side of the fourth spacer in the direction along the optical axis, and T34 is the air separation of the third lens and the fourth lens on the optical axis.

8. The optical system assembly of claim 1 wherein a third spacer positioned on an image side of the third lens and in contact with an image side portion of the third lens,

the optical system component satisfies: 15mm of ^-1 ＜V2/d3m+V3/D3m＜30mm ^-1 Wherein V2 is the abbe number of the second lens, V3 is the abbe number of the third lens, D3m is the inner diameter of the image side surface of the third spacer, and D3m is the outer diameter of the image side surface of the third spacer.

9. The optical system assembly of claim 1 wherein the at least one spacer further comprises an auxiliary spacer positioned on an image side of the fourth spacer and in contact with an image side portion of the fourth spacer,

the optical system component satisfies: 30mm < (D4 bm-D4 bm) ×CT5/CP4b < 92mm, where D4bm is the inner diameter of the image side surface of the auxiliary spacer, D4bm is the outer diameter of the image side surface of the auxiliary spacer, CT5 is the center thickness of the fifth lens on the optical axis, and CP4b is the maximum thickness of the auxiliary spacer.

10. The optical system assembly of claim 1 wherein a third spacer positioned on an image side of the third lens and in contact with an image side portion of the third lens,

The optical system component satisfies: 2 < (d3s+d4s)/(CP 3+ep34+ct 4) < 12, wherein D3s is an outer diameter of an object side surface of the third spacer, D4s is an outer diameter of an object side surface of the fourth spacer, CT4 is a center thickness of the fourth lens on the optical axis, CP3 is a maximum thickness of the third spacer, and EP34 is a distance between an image side surface of the third spacer and the object side surface of the fourth spacer in a direction along the optical axis.

11. The optical system assembly of any one of claims 1-10 wherein,

the first lens has positive optical power; and

the second lens has a negative optical power.

12. The optical system assembly of any one of claims 1-10 wherein,

the refractive index of all the first to fifth lenses is greater than 1.5; and

the number of lenses having positive optical power among the first to fifth lenses is greater than the number of lenses having negative optical power.