Optical system

Abstract

The application provides an optical system, comprising: a lens barrel, an inner wall surface of the lens barrel is stepped along an extension direction of an optical axis of the optical system, and a distance from the inner wall surface of the lens barrel to the optical axis gradually increases from an object side to an image side of the optical system; first to fifth lenses sequentially accommodated in the lens barrel from the object side to the image side of the optical system, the fifth lens having a negative focal power; and at least five abutting members, wherein a fourth abutting member is in contact with an image side surface part of the fourth lens, and a fifth abutting member is in contact with an image side surface part of the fifth lens; wherein the effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth abutting member, the distance EP45 from the image side surface of the fourth abutting member to the object side surface of the fifth abutting member along the optical axis, and the central thickness CT5 of the fifth lens satisfy: -40 < f5 / (CP4+EP45-CT5) < -5.0. The application solves the problem that high image quality and high stability are difficult to be considered in the prior art.

Description

Technical Field

[0001] This invention relates to the field of optical imaging, and more specifically, to an optical system. Background Technology

[0002] With the development of technology, the use of portable electronic products such as smartphones is becoming more and more diversified. The optical system on the phone plays an important role in more and more scenarios, and users have higher and higher requirements for the imaging quality of the optical system. At the same time, as mobile phones are developing towards thinner and lighter designs, the imaging quality and miniaturization of the optical systems on mobile phones and other portable electronic products are facing even greater challenges.

[0003] To optimize optical systems and improve imaging performance, a common approach is to design optical systems with a larger number of lenses. However, optical systems with a large number of lenses are bulky, making them unsuitable for ultra-thin mobile phones. Five-element optical systems, with fewer lenses, easily meet miniaturization requirements. However, while maintaining miniaturization in a five-element optical system, the small lens size makes certain surface shapes difficult to manufacture, potentially leading to issues such as suboptimal image quality and poor assembly stability. This is particularly true for the rear lenses and mounting components; improper design of lens thickness and spacing can result in poor assembly stability, directly affecting the quality of incident light rays on the image plane. Furthermore, the accumulation of aberrations in the front lenses and over a wide field of view also contributes to poor image quality. Therefore, improving the stability of the rear lenses and mounting components while effectively mitigating aberrations is a pressing issue that needs to be addressed. Summary of the Invention

[0004] The main objective of this invention is to provide an optical system that solves the problem of the difficulty in achieving both high image quality and high stability in existing optical systems.

[0005] To achieve the above objectives, according to one aspect of the present invention, an optical system is provided, comprising: a lens barrel, the inner wall surface of which is stepped along the extension direction of the optical axis of the optical system, and the distance from the inner wall surface of the lens barrel to the optical axis gradually increases from the object side to the image side of the optical system; a first lens to a fifth lens sequentially disposed within the lens barrel from the object side to the image side of the optical system, the fifth lens having a negative optical power; at least five support members, wherein the fourth support member contacts the image-side portion of the fourth lens, and the fifth support member contacts the image-side portion of the fifth lens; wherein the effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth support member, the distance EP45 between the image-side portion of the fourth support member and the object-side portion of the fifth support member along the optical axis, and the center thickness CT5 of the fifth lens satisfy: -40 <f5 / (CP4+EP45-CT5)<-5.0。

[0006] Furthermore, among the multiple supporting components, the one that contacts the image-side surface of the third lens is the third supporting component. The effective focal length f4 of the fourth lens, the maximum thickness CP3 of the third supporting component, the distance EP34 along the optical axis between the image-side surface of the third supporting component and the object-side surface of the fourth supporting component, and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following condition: 6.0 <f4 / (CP3+EP34-T34)<23。

[0007] Furthermore, among the multiple supporting components, the one that contacts the image-side portion of the first lens is the first supporting component, and among the multiple supporting components, the one that contacts the image-side portion of the second lens is the second supporting component. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the distance EP01 between the object-side end face of the lens barrel and the object-side portion of the first supporting component along the optical axis, the distance EP12 between the image-side portion of the first supporting component and the object-side portion of the second supporting component along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 4.5 < |f1 + f2| / (EP01 + EP12 - T12) < 11.

[0008] Furthermore, among the multiple supporting components, the one that contacts the image-side surface of the third lens is the third supporting component. The radius of curvature R8 of the image-side surface of the fourth lens, the refractive index N4 of the fourth lens, and the distance EP34 along the optical axis between the image-side surface of the third supporting component and the object-side surface of the fourth supporting component satisfy the following condition: -3.5 <R8*(N4-1) / EP34<-1.0。

[0009] Furthermore, among the multiple supporting components, the one that contacts the image-side surface of the first lens is the first supporting component. The radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the distance EP01 along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first supporting component, and the refractive index N1 of the first lens satisfy the following condition: 5.0 <N1*(R2-R1) / EP01<11.5。

[0010] Furthermore, the radius of curvature R10 of the image side of the fifth lens, the refractive index N5 of the fifth lens, and the distance EP45 along the optical axis from the image side of the fourth support member to the object side of the fifth support member satisfy the following condition: 2.0≤N5*R10 / EP45<12.

[0011] Furthermore, among the multiple supporting components, the one that contacts the image-side surface of the second lens is the second supporting component. The radius of curvature R4 of the image-side surface of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object-side surface of the second supporting component satisfy the following relationship: 1.5 <R4*(N2-1) / d2s<5.0。

[0012] Furthermore, among the multiple supporting components, the one that contacts the image side of the first lens is the first supporting component. The center thickness CT1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 between the object side end face of the lens barrel and the object side face of the first supporting component along the optical axis satisfy the following: 1.0 < (CT1 / (N1-1)) / EP01 < 2.0.

[0013] Furthermore, the air gap T45 between the fourth and fifth lenses on the optical axis, the center thickness CT5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the maximum thickness CP5 of the fifth support member satisfy the following condition: 2.0 < (T45 * (N4 - 1) + CT5 * N5) / CP5 < 5.0.

[0014] Furthermore, the maximum height L of the lens barrel, the effective focal length f of the optical system, and the maximum semi-FOV of the optical system satisfy the following condition: L / (f*tan(Semi-FOV))<1.4.

[0015] Furthermore, the first lens has positive optical power, and the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy the following condition: R2>R1>0.

[0016] Furthermore, the second lens has negative optical power, and the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the condition: |f2|>|f5|.

[0017] Furthermore, among the first to fifth lenses, the third lens has the largest absolute value of its effective focal length.

[0018] According to another aspect of the present invention, an optical system is provided, comprising: a lens barrel, the inner wall surface of which is stepped along the extension direction of the optical axis of the optical system, and the distance from the inner wall surface of the lens barrel to the optical axis gradually increases from the object side to the image side of the optical system; a first to a fifth lens, which are sequentially housed within the lens barrel from the object side to the image side of the optical system, the fifth lens having a negative optical power; at least five support members, wherein the third support member contacts the image-side surface portion of the third lens, and the fourth support member contacts the image-side surface portion of the fourth lens; wherein the effective focal length f4 of the fourth lens, the maximum thickness CP3 of the third support member, the distance EP34 between the image-side surface of the third support member and the object-side surface of the fourth support member along the optical axis, and the air gap T34 between the third and fourth lenses along the optical axis satisfy: 6.0 <f4 / (CP3+EP34-T34)<23。

[0019] Furthermore, among the multiple supporting components, the one that contacts the image-side portion of the first lens is the first supporting component, and among the multiple supporting components, the one that contacts the image-side portion of the second lens is the second supporting component. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the distance EP01 between the object-side end face of the lens barrel and the object-side portion of the first supporting component along the optical axis, the distance EP12 between the image-side portion of the first supporting component and the object-side portion of the second supporting component along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 4.5 < |f1 + f2| / (EP01 + EP12 - T12) < 11.

[0020] Furthermore, the radius of curvature R8 of the image-side surface of the fourth lens, the refractive index N4 of the fourth lens, and the distance EP34 along the optical axis between the image-side surface of the third support member and the object-side surface of the fourth support member satisfy the following condition: -3.5 <R8*(N4-1) / EP34<-1.0。

[0021] Furthermore, among the multiple supporting components, the one that contacts the image-side surface of the first lens is the first supporting component. The radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, the distance EP01 along the optical axis from the object-side end face of the lens barrel to the object-side surface of the first supporting component, and the refractive index N1 of the first lens satisfy the following condition: 5.0 <N1*(R2-R1) / EP01<11.5。

[0022] Furthermore, among the multiple supporting components, the one that contacts the image-side surface of the fifth lens is the fifth supporting component. The radius of curvature R10 of the image-side surface of the fifth lens, the refractive index N5 of the fifth lens, and the distance EP45 along the optical axis between the image-side surface of the fourth supporting component and the object-side surface of the fifth supporting component satisfy the following condition: 2.0≤N5*R10 / EP45<12.

[0023] Furthermore, among the multiple supporting components, the one that contacts the image-side surface of the second lens is the second supporting component. The radius of curvature R4 of the image-side surface of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object-side surface of the second supporting component satisfy the following relationship: 1.5 <R4*(N2-1) / d2s<5.0。

[0024] Furthermore, among the multiple supporting components, the one that contacts the image side of the first lens is the first supporting component. The center thickness CT1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 between the object side end face of the lens barrel and the object side face of the first supporting component along the optical axis satisfy the following: 1.0 < (CT1 / (N1-1)) / EP01 < 2.0.

[0025] Furthermore, among the multiple supporting components, the one that contacts the image side portion of the fifth lens is the fifth supporting component. The air gap T45 between the fourth and fifth lenses on the optical axis, the center thickness CT5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the maximum thickness CP5 of the fifth supporting component satisfy the following condition: 2.0 < (T45*(N4-1)+CT5*N5) / CP5 < 5.0.

[0026] Furthermore, the maximum height L of the lens barrel, the effective focal length f of the optical system, and the maximum semi-FOV of the optical system satisfy the following condition: L / (f*tan(Semi-FOV))<1.4.

[0027] Furthermore, the first lens has positive optical power, and the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy the following condition: R2>R1>0.

[0028] Furthermore, the second lens has negative optical power, and the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the condition: |f2|>|f5|.

[0029] Furthermore, among the first to fifth lenses, the third lens has the largest absolute value of its effective focal length.

[0030] According to the technical solution of this invention, the optical system includes a lens barrel, a first to a fifth lens arranged sequentially from the object side to the image side of the optical system within the lens barrel, and at least five support members. The inner wall surface of the lens barrel is stepped along the extension direction of the optical axis of the optical system, and the distance from the inner wall surface of the lens barrel to the optical axis gradually increases from the object side to the image side of the optical system. The fifth lens has negative optical power. The fourth support member is in contact with the image side surface of the fourth lens, and the fifth support member is in contact with the image side surface of the fifth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth support member, the distance EP45 between the image side surface of the fourth support member and the object side surface of the fifth support member along the optical axis, and the center thickness CT5 of the fifth lens satisfy the following condition: -40°. <f5 / (CP4+EP45-CT5)<-5.0。

[0031] The five-element optical system of this application, by controlling f5, CP4, EP45, and CT5 within a certain range, can adjust the range of emitted light using the fifth lens and the fourth support, intercepting stray light and light with large aberrations, while avoiding excessive differences in the center and edge thickness of the fifth lens. This maximizes the adjustment of the peak field of view and the field curvature of the outer field of view, enabling the optical system to have better coma performance. Furthermore, combined with the negative optical power of the fifth lens and the design of the inner diameter of the lens barrel gradually increasing from the object side to the image side, it helps to correct the aberrations generated after the light passes through the first to fourth lenses while ensuring the imaging effect of light with a large field of view. This controls the aberrations of the optical system to meet the design requirements and improves the imaging quality. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 A schematic diagram of the structure of an optical system according to an alternative embodiment of the present invention is shown;

[0034] Figure 2 A schematic diagram of the lens structure of the optical system of Example 1 of the present invention is shown;

[0035] Figure 3 A schematic diagram of the optical system of Example 1 of the present invention in a first state is shown;

[0036] Figure 4 A schematic diagram of the optical system of Example 1 of the present invention in a second state is shown;

[0037] Figure 5 A schematic diagram of the optical system of Example 1 of the present invention in a third state is shown;

[0038] Figures 6 to 9 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 1 of the present invention are shown respectively.

[0039] Figure 10 A schematic diagram of the lens structure of the optical system of Example 2 of the present invention is shown;

[0040] Figure 11 A schematic diagram of the optical system of Example 2 of the present invention in a first state is shown;

[0041] Figure 12 A schematic diagram of the optical system of Example 2 of the present invention in a second state is shown;

[0042] Figure 13A schematic diagram of the optical system of Example 2 of the present invention in the third state is shown;

[0043] Figures 14 to 17 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 2 of the present invention are shown respectively.

[0044] Figure 18 A schematic diagram of the lens structure of the optical system of Example 3 of the present invention is shown;

[0045] Figure 19 A schematic diagram of the optical system of Example 3 of the present invention in a first state is shown;

[0046] Figure 20 A schematic diagram of the optical system of Example 3 of the present invention in a second state is shown;

[0047] Figure 21 A schematic diagram of the optical system of Example 3 of the present invention in a third state is shown;

[0048] Figures 22 to 25 The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of Example 3 of the present invention are shown respectively.

[0049] The above figures include the following reference numerals:

[0050] P0, Lens tube; STO, Aperture stop; E1, First lens; S1, Object-side surface of the first lens; S2, Image-side surface of the first lens; P1, First support; E2, Second lens; S3, Object-side surface of the second lens; S4, Image-side surface of the second lens; P2, Second support; E3, Third lens; S5, Object-side surface of the third lens; S6, Image-side surface of the third lens; P3, Third support; P3b, Third auxiliary support; E4, Fourth lens; S7, Object-side surface of the fourth lens; S8, Image-side surface of the fourth lens; P4, Fourth support; E5, Fifth lens; S9, Object-side surface of the fifth lens; S10, Image-side surface of the fifth lens; P5, Fifth support; E6, Filter; S11, Object-side surface of the filter; S12, Image-side surface of the filter; S13, Imaging plane. Detailed Implementation

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0053] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0054] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second or third lens.

[0055] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0056] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and the location of that convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of that concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The determination of the surface shape in the paraxial region can be based on the judgment method commonly used in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens data database of optical software) to determine convexity or concavity. For the object side, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image side, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0057] To address the problem of balancing high image quality and high stability in existing optical systems, this invention provides an optical system.

[0058] Example 1

[0059] like Figures 1 to 25As shown, the optical system includes a lens barrel P0, a first to a fifth lens arranged sequentially from the object side to the image side of the optical system within the lens barrel P0, and at least five support members. The inner wall of the lens barrel P0 is stepped along the extension direction of the optical axis of the optical system, and the distance from the inner wall of the lens barrel P0 to the optical axis gradually increases from the object side to the image side of the optical system. The fifth lens has negative optical power. The fourth support member is in contact with the image side of the fourth lens, and the fifth support member is in contact with the image side of the fifth lens. The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth support member, the distance EP45 between the image side of the fourth support member and the object side of the fifth support member along the optical axis, and the center thickness CT5 of the fifth lens satisfy the following condition: -40°. <f5 / (CP4+EP45-CT5)<-5.0。

[0060] The five-element optical system of this application, by controlling f5, CP4, EP45, and CT5 within a certain range, can adjust the range of emitted light using the fifth lens and the fourth support, intercepting stray light and light with large aberrations, while avoiding excessive differences in the center and edge thickness of the fifth lens. This maximizes the adjustment of the peak field of view and the field curvature of the outer field of view, enabling the optical system to have better coma performance. Furthermore, by controlling f5 / (CP4+EP45-CT5) within a reasonable range, combined with the negative optical power of the fifth lens and the design of the lens barrel P0 gradually increasing from the object side to the image side, it ensures the imaging effect of light with a large field of view, while helping to correct the aberrations generated after the light passes through the first to fourth lenses, thereby controlling the aberrations of the optical system to meet the design requirements and improving the image quality.

[0061] Preferably, the effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth support member, the distance EP45 between the image side of the fourth support member and the object side of the fifth support member along the optical axis, and the center thickness CT5 of the fifth lens satisfy the following condition: -36.00≤f5 / (CP4+EP45-CT5)≤-5.48.

[0062] In this embodiment, among the multiple supporting members, the third supporting member is the one that contacts the image-side portion of the third lens. The effective focal length f4 of the fourth lens, the maximum thickness CP3 of the third supporting member, the distance EP34 along the optical axis from the image side of the third supporting member to the object side of the fourth supporting member, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 6.0 < f4 / (CP3 + EP34 - T34) < 23. By restricting f4 / (CP3 + EP34 - T34) within a reasonable range, it is possible to control the aberration of the front-end optical lens within the focal length required for the fourth lens, so that the aberration of the optical system meets the design requirements. By controlling T34 and CP3, the third lens, the fourth lens, and the third supporting member exhibit good performance in terms of structural and assembly stability. Preferably, 6.23 ≤ f4 / (CP3 + EP34 - T34) ≤ 22.34.

[0063] In this embodiment, among the multiple supporting members, the first supporting member is the one that contacts the image-side portion of the first lens, and the second supporting member is the one that contacts the image-side portion of the second lens. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the distance EP01 along the optical axis from the object-side end face of the lens barrel P0 to the object side of the first supporting member, the distance EP12 along the optical axis from the image side of the first supporting member to the object side of the second supporting member, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 4.5 < |f1 + f2| / (EP01 + EP12 - T12) < 11. By restricting |f1 + f2| / (EP01 + EP12 - T12) within a reasonable range, it is possible to adjust the effective focal lengths of the first lens and the second lens, so that sufficient light can pass through the optical system from the first lens to the second lens, meeting the light input amount of the optical system and improving the relative illuminance of its outer field of view, which is beneficial for correcting off-axis aberration and improving the overall imaging quality of the optical system. Preferably, 4.84 ≤ |f1 + f2| / (EP01 + EP12 - T12) ≤ 10.23.

[0064] In this embodiment, among the multiple supporting members, the third supporting member is the one that contacts the image-side portion of the third lens. The radius of curvature R8 of the image side of the fourth lens, the refractive index N4 of the fourth lens, and the distance EP34 along the optical axis from the image side of the third supporting member to the object side of the fourth supporting member satisfy: -3.5 < R8 * (N4 - 1) / EP34 < -1.0. By restricting R8 * (N4 - 1) / EP34 within a reasonable range, in the control of the radius of curvature and refractive index of the fourth lens, the design value of the lens structure can be determined. While ensuring the compactness of the optical system structure, the edge thickness of the fourth lens can be controlled by controlling EP34, and then there is enough space to reduce the sensitivity of the rear-end lens to the optical system. Preferably, -3.38 ≤ R8 * (N4 - 1) / EP34 ≤ -1.18.

[0065] In this embodiment, among the multiple supporting members, the one that contacts the image-side portion of the first lens is the first supporting member. The following relationship is satisfied among the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, the distance EP01 along the optical axis from the object-side end face of the lens barrel P0 to the object side of the first supporting member, and the refractive index N1 of the first lens: 5.0 < N1*(R2 - R1) / EP01 < 11.5. By restricting N1*(R2 - R1) / EP01 within a reasonable range, the curvature radius of the object side of the first lens and the curvature radius of the image side of the first lens can be controlled. When the light intensity is effectively satisfied, the curvature radius of the rear lens can be tightened, ensuring a compact lens structure. It also helps with the spacing between lenses along the optical axis, reduces the sensitivity of the optical system, and improves production stability. Preferably, 5.52 ≤ N1*(R2 - R1) / EP01 ≤ 11.08.

[0066] In this embodiment, the following relationship is satisfied among the curvature radius R10 of the image side of the fifth lens, the refractive index N5 of the fifth lens, and the distance EP45 along the optical axis from the image side of the fourth supporting member to the object side of the fifth supporting member: 2.0 ≤ N5*R10 / EP45 < 12. By restricting N5*R10 / EP45 within a reasonable range, the curvature radius of the image side of the fifth lens can be controlled. When the light intensity is effectively satisfied, the distance along the optical axis from the image side of the fourth supporting member to the object side of the fifth supporting member can be adjusted, ensuring a compact lens structure. It reduces the sensitivity of the optical system and improves production stability. Preferably, 2.09 ≤ N5*R10 / EP45 ≤ 11.67.

[0067] In this embodiment, among the multiple supporting members, the one that contacts the image-side portion of the second lens is the second supporting member. The following relationship is satisfied among the curvature radius R4 of the image side of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object side of the second supporting member: 1.5 < R4*(N2 - 1) / d2s < 5.0. By restricting R4*(N2 - 1) / d2s within a reasonable range, the curvature radius of the image side of the second lens can be controlled, which is more beneficial to the imaging quality of light when passing through the second lens. The refractive index of the lens can be reasonably controlled to keep the light angle in the marginal field of view within a reasonable range, effectively reducing the sensitivity of the optical system. By controlling the inner diameter of the object side of the second supporting member, off-axis aberration can be corrected, improving the overall imaging quality of the optical system. Preferably, 1.73 ≤ R4*(N2 - 1) / d2s ≤ 4.68.

[0068] In this embodiment, the first support member is the one that contacts the image-side surface of the first lens among the multiple support members. The center thickness CT1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 along the optical axis from the object-side end face of the lens barrel P0 to the object-side surface of the first support member satisfy the following condition: 1.0 < (CT1 / (N1-1)) / EP01 < 2.0. By limiting (CT1 / (N1-1)) / EP01 within a reasonable range, and by controlling the refractive index and center thickness of the first lens, the distance along the optical axis from the object-side end face of the lens barrel P0 to the object-side surface of the first support member can be adjusted to ensure that the light intake of the optical system meets the requirements, and the front-end structure of the optical system is more compact and stable. Preferably, 1.11 ≤ (CT1 / (N1-1)) / EP01 ≤ 1.91.

[0069] In this embodiment, the air gap T45 between the fourth and fifth lenses on the optical axis, the center thickness CT5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the maximum thickness CP5 of the fifth support member satisfy the following condition: 2.0 < (T45*(N4-1) + CT5*N5) / CP5 < 5.0. By limiting (T45*(N4-1) + CT5*N5) / CP5 within a reasonable range, while ensuring that the aperture meets the required depth of field and illumination, the air gap between the fourth and fifth lenses on the optical axis can be changed by adjusting the refractive index of the fourth and fifth lenses. This, in turn, adjusts the center thickness of the fifth lens and reduces the air gap between the two lenses, effectively reducing the structural space of the lens. Such adjustments provide more space for correcting positive axial aberrations, improving the system's imaging quality. Preferably, 2.27 ≤ (T45*(N4-1) + CT5*N5) / CP5 ≤ 4.90.

[0070] In this embodiment, the maximum height L of the lens barrel P0, the effective focal length f of the optical system, and the maximum semi-field of view (Semi-FOV) of the optical system satisfy the following condition: L / (f*tan(Semi-FOV)) < 1.4. By limiting L / (f*tan(Semi-FOV)) within a reasonable range, the effective focal length and field of view of the optical system can be effectively controlled, the size of the optical system can be effectively reduced, the optical performance of the optical system can be ensured, and it is easier to process and inject molded parts, ensuring stable assembly. Preferably, 1.00 ≤ L / (f*tan(Semi-FOV)) ≤ 1.34.

[0071] In this embodiment, the first lens has positive optical power, and the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy the condition: R2>R1>0. By designing the optical power of the first lens to be positive and R2>R1>0, the overall TTL of the optical system can be reduced, aberrations can be decreased, and it can be better matched to the telephoto system.

[0072] In this embodiment, the second lens has negative optical power, and the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy |f2|>|f5|. By designing the optical power of the second lens to be negative, the effective focal length (EFL) of the optical system can be lengthened. At the same time, |f2|>|f5| allows the second lens to bear more of the light deflection effect, reducing the sensitivity of the rear lenses of the optical system.

[0073] In this embodiment, among the first to fifth lenses, the third lens has the largest absolute value of effective focal length, which can improve the ability to converge or diverge light, resulting in a smaller overall TTL of the optical system and reduced aberrations.

[0074] Example 2

[0075] like Figures 1 to 25 As shown, the optical system includes a lens barrel P0, first to fifth lens elements sequentially housed within the lens barrel P0 from the object side to the image side of the optical system, and at least five support members. The inner wall of the lens barrel P0 is stepped along the optical axis of the optical system, and the distance from the inner wall of the lens barrel P0 to the optical axis gradually increases from the object side to the image side of the optical system. The fifth lens element has negative optical power. The support member that contacts the image side side of the third lens element is the third support member, and the support member that contacts the image side side of the fourth lens element is the fourth support member. The effective focal length f4 of the fourth lens element, the maximum thickness CP3 of the third support member, the distance EP34 between the image side side of the third support member and the object side side of the fourth support member along the optical axis, and the air gap T34 between the third and fourth lens elements along the optical axis satisfy the following condition: 6.0. <f4 / (CP3+EP34-T34)<23。

[0076] By limiting f4 / (CP3+EP34-T34) within a reasonable range, the aberrations of the front optical lens can be controlled within the focal length required to meet the fourth lens requirement, so that the aberrations of the optical system meet the design requirements. By controlling T34 and CP3, the third lens, the fourth lens, and the third support component can exhibit good stability in structure and assembly.

[0077] Preferably, the effective focal length f4 of the fourth lens, the maximum thickness CP3 of the third support member, the distance EP34 between the image side of the third support member and the object side of the fourth support member along the optical axis, and the air gap T34 between the third and fourth lenses on the optical axis satisfy the following: 6.23≤f4 / (CP3+EP34-T34)≤22.34.

[0078] In this embodiment, among the multiple supporting members, the one that contacts the image-side portion of the first lens is the first supporting member, and the one that contacts the image-side portion of the second lens is the second supporting member. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the distance EP01 along the optical axis from the object-side end face of the lens barrel P0 to the object-side face of the first supporting member, the distance EP12 along the optical axis from the image-side face of the first supporting member to the object-side face of the second supporting member, and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 4.5 < |f1 + f2| / (EP01 + EP12 - T12) < 11. By restricting |f1 + f2| / (EP01 + EP12 - T12) within a reasonable range, the effective focal lengths of the first lens and the second lens can be adjusted, enabling sufficient light to pass through the optical system from the first lens to the second lens, meeting the light input of the optical system, improving the relative illuminance of its outer field of view, facilitating the correction of off-axis aberrations, and enhancing the overall imaging quality of the optical system. Preferably, 4.84 ≤ |f1 + f2| / (EP01 + EP12 - T12) ≤ 10.23.

[0079] In this embodiment, among the multiple supporting members, the one that contacts the image-side portion of the third lens is the third supporting member. The radius of curvature R8 of the image-side face of the fourth lens, the refractive index N4 of the fourth lens, and the distance EP34 along the optical axis from the image-side face of the third supporting member to the object-side face of the fourth supporting member satisfy: -3.5 < R8 * (N4 - 1) / EP34 < -1.0. By restricting R8 * (N4 - 1) / EP34 within a reasonable range, in the control of the radius of curvature and refractive index of the fourth lens, the design value size on the lens structure can be determined. While ensuring the compactness of the optical system structure, the edge thickness of the fourth lens can be controlled by controlling EP34, and thus there is sufficient space to reduce the sensitivity of the rear lens to the optical system. Preferably, -3.38 ≤ R8 * (N4 - 1) / EP34 ≤ -1.18.

[0080] In this embodiment, the first supporting member among the multiple supporting members contacts the image-side portion of the first lens. The following relationships are satisfied among the curvature radius R1 of the object side of the first lens, the curvature radius R2 of the image side of the first lens, the distance EP01 along the optical axis from the object-side end face of the lens barrel P0 to the object side of the first supporting member, and the refractive index N1 of the first lens: 5.0 < N1*(R2 - R1) / EP01 < 11.5. By limiting N1*(R2 - R1) / EP01 within a reasonable range, the curvature radius of the object side of the first lens and the curvature radius of the image side of the first lens can be controlled. When the light intensity is effectively satisfied, the curvature radius of the rear lens can be tightened, ensuring a compact lens structure, which is also helpful for the distance between lenses on the optical axis, reducing the sensitivity of the optical system, and improving production stability. Preferably, 5.52 ≤ N1*(R2 - R1) / EP01 ≤ 11.08.

[0081] In this embodiment, the following relationships are satisfied among the curvature radius R10 of the image side of the fifth lens, the refractive index N5 of the fifth lens, and the distance EP45 along the optical axis from the image side of the fourth supporting member to the object side of the fifth supporting member: 2.0 ≤ N5*R10 / EP45 < 12. By limiting N5*R10 / EP45 within a reasonable range, the curvature radius of the image side of the fifth lens can be controlled. When the light intensity is effectively satisfied, the distance along the optical axis from the image side of the fourth supporting member to the object side of the fifth supporting member can be adjusted, ensuring a compact lens structure, reducing the sensitivity of the optical system, and improving production stability. Preferably, 2.09 ≤ N5*R10 / EP45 ≤ 11.67.

[0082] In this embodiment, the second supporting member among the multiple supporting members contacts the image-side portion of the second lens. The following relationships are satisfied among the curvature radius R4 of the image side of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object side of the second supporting member: 1.5 < R4*(N2 - 1) / d2s < 5.0. By limiting R4*(N2 - 1) / d2s within a reasonable range, the curvature radius of the image side of the second lens can be controlled, which is more beneficial to the imaging quality of light when passing through the second lens. By reasonably controlling the refractive index of the lens, the light angle in the peripheral field of view can be within a reasonable range, effectively reducing the sensitivity of the optical system. By controlling the inner diameter of the object side of the second supporting member, off-axis aberration can be corrected, improving the overall imaging quality of the optical system. Preferably, 1.73 ≤ R4*(N2 - 1) / d2s ≤ 4.68.

[0083] In this embodiment, the first support member is the one that contacts the image-side surface of the first lens among the multiple support members. The center thickness CT1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 along the optical axis from the object-side end face of the lens barrel P0 to the object-side surface of the first support member satisfy the following condition: 1.0 < (CT1 / (N1-1)) / EP01 < 2.0. By limiting (CT1 / (N1-1)) / EP01 within a reasonable range, and by controlling the refractive index and center thickness of the first lens, the distance along the optical axis from the object-side end face of the lens barrel P0 to the object-side surface of the first support member can be adjusted to ensure that the light intake of the optical system meets the requirements, and the front-end structure of the optical system is more compact and stable. Preferably, 1.11 ≤ (CT1 / (N1-1)) / EP01 ≤ 1.91.

[0084] In this embodiment, the air gap T45 between the fourth and fifth lenses on the optical axis, the center thickness CT5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the maximum thickness CP5 of the fifth support member satisfy the following condition: 2.0 < (T45*(N4-1) + CT5*N5) / CP5 < 5.0. By limiting (T45*(N4-1) + CT5*N5) / CP5 within a reasonable range, while ensuring that the aperture meets the required depth of field and illumination, the air gap between the fourth and fifth lenses on the optical axis can be changed by adjusting the refractive index of the fourth and fifth lenses. This, in turn, adjusts the center thickness of the fifth lens and reduces the air gap between the two lenses, effectively reducing the structural space of the lens. Such an adjustment provides more space for correcting positive axial aberrations, improving the system's imaging quality. Preferably, 2.27 ≤ (T45*(N4-1) + CT5*N5) / CP5 ≤ 4.90.

[0085] In this embodiment, the maximum height L of the lens barrel P0, the effective focal length f of the optical system, and the maximum semi-field of view (Semi-FOV) of the optical system satisfy the following condition: L / (f*tan(Semi-FOV)) < 1.4. By limiting L / (f*tan(Semi-FOV)) within a reasonable range, the effective focal length and field of view of the optical system can be effectively controlled, the size of the optical system can be effectively reduced, the optical performance of the optical system can be ensured, and it is easier to process and inject molded parts, ensuring stable assembly. Preferably, 1.00 ≤ L / (f*tan(Semi-FOV)) ≤ 1.34.

[0086] In this embodiment, the first lens has positive optical power, and the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy the condition: R2>R1>0. By designing the optical power of the first lens to be positive and R2>R1>0, the overall TTL of the optical system can be reduced, aberrations can be decreased, and it can be better matched to the telephoto system.

[0087] In this embodiment, the second lens has negative optical power, and the effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy |f2|>|f5|. By designing the optical power of the second lens to be negative, the effective focal length (EFL) of the optical system can be lengthened. At the same time, |f2|>|f5| allows the second lens to bear more of the light deflection effect, reducing the sensitivity of the rear lenses of the optical system.

[0088] In this embodiment, among the first to fifth lenses, the third lens has the largest absolute value of effective focal length, which can improve the ability to converge or diverge light, resulting in a smaller overall TTL of the optical system and reduced aberrations.

[0089] Optionally, the optical system described above may also include color filters for correcting color deviations and / or protective glass for protecting the photosensitive element located on the imaging surface.

[0090] The optical system in this application can employ multiple lenses, such as the five lenses mentioned above. By rationally allocating the effective focal length, surface shape, center thickness of each lens, and on-axis distance between each lens, the aperture of the optical system can be effectively increased, the sensitivity of the lens can be reduced, and the manufacturability of the lens can be improved, making the optical system more conducive to manufacturing and suitable for portable electronic devices such as smartphones.

[0091] In this application, at least one of the lens surfaces is an aspherical lens. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike spherical lenses, which have a constant curvature from their center to their periphery, aspherical lenses possess superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By employing aspherical lenses, aberrations occurring during image formation can be eliminated as much as possible, thereby improving image quality.

[0092] However, those skilled in the art will understand that the number of lenses constituting the optical system can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although five lenses are described as an example in the embodiments, the optical system is not limited to including five lenses. If necessary, the optical system may also include other numbers of lenses.

[0093] Figure 1 A schematic diagram of the structure of an optical system of this application is shown. Figure 1 The diagram also indicates parameters such as d2s and EP12 to clearly and intuitively explain their meaning. To better illustrate the optical system structure and specific surface features, these parameters will not be shown in the accompanying diagrams when explaining specific examples later.

[0094] Where, dis refers to the inner diameter of the object side surface of the i-th support member, and i is a value taken from 1, 2, 3, 4, 5. EPij refers to the distance along the optical axis between the image side surface of the i-th support member and the object side surface of the j-th support member, where j > i, and i is a value taken from 1, 2, 3, 4, and j is a value taken from 2, 3, 4, 5. The object side end face of the lens barrel P0 is the surface of the lens barrel P0 closest to the object side, and the image side end face of the lens barrel P0 is the surface of the lens barrel P0 closest to the image side. The maximum height L of the lens barrel refers to the maximum value of the distance along the optical axis from the object side end face to the image side end face of the lens barrel P0. The maximum thickness CPi of the i-th support member refers to the maximum value of the distance along the optical axis from the object side surface to the image side surface of the i-th support member.

[0095] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of the optical system applicable to the above embodiments.

[0096] It should be noted that the following examples include a first state, a second state, and a third state. Within the same example, the radius of curvature, center thickness, inter-lens spacing, and higher-order image coefficients of the individual lenses are the same in all three states. However, the parameters such as the lens barrel P0, the thickness of the bearing, the inner and outer diameters of the bearing, and the distance between the bearings differ, as do the shapes of some lenses. In other words, the main structure used for imaging is the same, but the auxiliary structures used for imaging are different.

[0097] It should be noted that any of the examples one through three below are applicable to all embodiments of this application.

[0098] Example 1

[0099] like Figures 2 to 9 As shown, an optical system of Example 1 of this application is described. Figure 2 A schematic diagram of the lens structure of the optical system is shown. Figure 3 A schematic diagram of the optical system in Example 1 in its first state is shown. Figure 4 A schematic diagram of the optical system in Example 1 in the second state is shown. Figure 5 A schematic diagram of the optical system in Example 1 in the third state is shown.

[0100] like Figure 3 As shown, the optical system includes, in sequence from the object side to the image side: first lens E1, first support P1, second lens E2, second support P2, third lens E3, third support P3, fourth lens E4, fourth support P4, fifth lens E5, and fifth support P5.

[0101] exist Figure 3In this system, all the supporting components are in direct contact with the lens. The second supporting component has the smallest inner diameter to block stray light from both sides, ensuring image quality without affecting the amount of light entering the lens. The third supporting component has the largest thickness of all the supporting components, providing stable support at the large gap between the edges of the second and third lenses. The fifth supporting component also helps to fix the last lens, preventing it from shifting.

[0102] like Figure 4 and Figure 5 As shown, the optical system, from the object side to the image side, includes the following components in sequence: first lens E1, first support P1, second lens E2, second support P2, third lens E3, third support P3, fourth lens E4, fourth support P4, fifth lens E5, and fifth support P5. The first lens E1 to the third lens E3 are sequentially fastened together, with the support components located inside the fastening structure. The remaining support components are in direct contact with the lenses. The second support component has the smallest inner diameter to intercept stray light from both sides, ensuring image quality without affecting the amount of light entering the lens. The third support component has the largest thickness among all support components, providing stable support at a large interval between the edges of the second and third lenses. The fifth support component also serves to fix the last lens, preventing lens movement.

[0103] The aperture STO is located on the object side of the first lens. The object side S1 of the first lens is convex, and the image side S2 is concave. The object side S3 of the second lens is convex, and the image side S4 is concave. The object side S5 of the third lens is concave, and the image side S6 is convex. The object side S7 of the fourth lens is convex, and the image side S8 is convex. The object side S9 of the fifth lens is concave, and the image side S10 is concave. The filter E6 has an object side S11 and an image side S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0104] Table 1 shows the basic structural parameters of the optical system in Example 1, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0105] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.3201 S1 aspherical 1.3668 0.5178 1.5460 65.0500 0.0333 S2 aspherical 4.9226 0.1000 9.3102 S3 aspherical 14.2099 0.2400 1.7390 28.4700 -59.9265 S4 aspherical 4.0735 0.3180 -28.9154 S5 aspherical -33.1354 0.3849 1.6220 60.3200 -98.0000 S6 aspherical -10.7813 0.4757 -20.0535 S7 aspherical 60.2880 0.5993 1.5600 47.2900 -98.0000 S8 aspherical -1.6128 0.4949 -3.0410 S9 aspherical -2.4690 0.2388 1.5370 55.7800 -0.0351 S10 aspherical 2.0817 0.3258 -1.3418 S11 spherical endless 0.2100 1.5180 64.1700 S12 spherical endless 0.3949 S13 spherical endless

[0106] Table 1

[0107] In Example 1, the object-side surface and image-side surface of any one of the first lens E1 to the fifth lens E5 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0108]

[0109] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirrors S1-S10 in Example 1.

[0110] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.0440E-02 2.9273E-01 -2.0018E+00 8.3199E+00 -2.1573E+01 3.5091E+01 -3.4870E+01 1.9342E+01 -4.6085E+00 S2 -1.1027E-01 -2.9624E-02 8.1946E-01 -3.7557E+00 1.0409E+01 -1.8207E+01 1.9138E+01 -1.0936E+01 2.5656E+00 S3 -1.3889E-01 3.1977E-01 -8.2248E-01 4.7982E+00 -1.7828E+01 3.8613E+01 -4.9003E+01 3.4047E+01 -1.0034E+01 S4 -5.4005E-03 4.2312E-01 -2.5141E+00 1.6778E+01 -6.7388E+01 1.6412E+02 -2.3840E+02 1.9059E+02 -6.4337E+01 S5 -2.3084E-01 2.7548E-01 -1.5153E+00 3.2871E+00 1.0861E+00 -2.3763E+01 5.4430E+01 -5.4509E+01 2.1439E+01 S6 -1.8456E-01 1.2884E-01 -9.1503E-01 3.2233E+00 -7.3666E+00 1.0619E+01 -9.2538E+00 4.4123E+00 -8.6414E-01 S7 -3.2001E-03 -2.3865E-02 5.0968E-03 1.0364E-02 -3.2190E-02 2.6138E-02 -8.6641E-03 1.1725E-03 -4.1472E-05 S8 8.7042E-02 -1.3756E-01 2.1723E-01 -1.8132E-01 8.8183E-02 -2.6451E-02 4.8579E-03 -5.0282E-04 2.2501E-05 S9 -1.1170E-01 1.8295E-02 7.7660E-02 -6.0724E-02 2.2854E-02 -5.1096E-03 6.9430E-04 -5.3227E-05 1.7746E-06 S10 -2.6344E-01 1.9357E-01 -1.0957E-01 4.4540E-02 -1.2471E-02 2.2955E-03 -2.6265E-04 1.6861E-05 -4.6298E-07

[0111] Table 2

[0112] Figure 6 The on-axis chromatic aberration curve of the optical system in Example 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical system. Figure 7 The astigmatism curves of the optical system in Example 1 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 8 The distortion curves of the optical system in Example 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 9 The magnification chromatic aberration curve of the optical system in Example 1 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical system.

[0113] according to Figures 6 to 9 As can be seen, the optical system given in Example 1 can achieve good imaging quality.

[0114] Example 2

[0115] like Figures 10 to 17 As shown, the optical system of Example 2 of this application is described. Figure 10 A schematic diagram of the lens structure of the optical system is shown. Figure 11 A schematic diagram of the optical system in Example 2 in its first state is shown. Figure 12 A schematic diagram of the optical system in Example 2 in the second state is shown. Figure 13 A schematic diagram of the optical system in Example 2 in its third state is shown. For the sake of brevity, descriptions similar to those in Example 1 are omitted.

[0116] like Figure 11 As shown, the optical system includes, in sequence from the object side to the image side: first lens E1, first support P1, second lens E2, second support P2, third lens E3, third support P3, fourth lens E4, fourth support P4, fifth lens E5, and fifth support P5.

[0117] exist Figure 11In this system, all the supporting components are in direct contact with the lens. The second supporting component has the smallest inner diameter to block stray light from both sides, ensuring image quality without affecting the amount of light entering the lens. The third supporting component has the largest thickness of all the supporting components, providing stable support at the large gap between the edges of the second and third lenses. The fifth supporting component also helps to fix the last lens, preventing it from shifting.

[0118] like Figure 12 As shown, the optical system includes, in sequence from the object side to the image side: first lens E1, first support P1, second lens E2, second support P2, third lens E3, third support P3, fourth lens E4, fourth support P4, fifth lens E5, and fifth support P5.

[0119] exist Figure 12 In this design, the first lens E1 and the second lens E2 are fastened together. The first support member is located inside the fastening structure, while the remaining support members are in direct contact with the lenses. The second support member has the smallest inner diameter to block stray light from both sides, ensuring image quality without affecting the amount of light entering the lens. The fifth support member also serves to secure the last lens, preventing it from shifting.

[0120] like Figure 13 As shown, the optical system includes, in sequence from the object side to the image side: first lens E1, first support P1, second lens E2, second support P2, third lens E3, third support P3, third auxiliary support P3b, fourth lens E4, fourth support P4, fifth lens E5, and fifth support P5.

[0121] exist Figure 13 In this system, all the supporting components are in direct contact with the lens. The second supporting component has the smallest inner diameter to block stray light from both sides, ensuring image quality without affecting the amount of light entering the lens. The third auxiliary supporting component has the largest thickness of all the supporting components, providing stable support at a large interval between the edges of the second and third lenses. The fifth supporting component also helps to fix the last lens, preventing it from shifting.

[0122] The aperture STO is located on the object side of the first lens. The object side S1 of the first lens is convex, and the image side S2 is concave. The object side S3 and image side S4 of the second lens are concave. The object side S5 of the third lens is convex, and the image side S6 is concave. The object side S7 of the fourth lens is concave, and the image side S8 is convex. The object side S9 and image side S10 of the fifth lens are concave. The filter E6 has an object side S11 and an image side S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0123] Table 3 shows the basic structural parameters of the optical system in Example 2, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0124] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.3201 S1 aspherical 1.1564 0.5454 1.4890 70.4000 -0.0478 S2 aspherical 3.7694 0.1286 3.0993 S3 aspherical -38.1233 0.2400 1.6720 20.0000 -98.0000 S4 aspherical 10.3083 0.2585 21.1096 S5 aspherical 32.4178 0.2314 1.5430 49.1100 14.1523 S6 aspherical 19.3254 0.4344 64.0242 S7 aspherical -52.2716 0.5068 1.5130 58.2900 -98.0000 S8 aspherical -1.7550 0.5567 -2.8169 S9 aspherical -2.3921 0.2388 1.5370 55.7800 -0.0110 S10 aspherical 2.1593 0.3054 -1.1416 S11 spherical endless 0.1100 1.5180 64.1700 S12 spherical endless 0.4740 S13 spherical endless

[0125] Table 3

[0126] Table 4 gives the higher-order coefficients of S1-S10 that can be used for each aspherical lens in Example 2. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0127] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -2.7114E-02 4.5623E-01 -3.6669E+00 1.7776E+01 -5.3601E+01 1.0108E+02 -1.1596E+02 7.3998E+01 -2.0290E+01 S2 -7.3888E-02 1.5940E-01 -2.2228E+00 1.4952E+01 -5.8197E+01 1.3566E+02 -1.8742E+02 1.4069E+02 -4.4138E+01 S3 -7.3558E-02 3.5683E-01 -2.5363E+00 1.8461E+01 -7.6873E+01 1.9225E+02 -2.8670E+02 2.3433E+02 -8.0504E+01 S4 -6.4007E-02 1.0255E+00 -7.6471E+00 4.7612E+01 -1.8569E+02 4.6120E+02 -7.0441E+02 6.0144E+02 -2.1745E+02 S5 -3.4912E-01 -1.0127E+00 1.2226E+01 -8.1979E+01 3.3261E+02 -8.3301E+02 1.2518E+03 -1.0299E+03 3.5489E+02 S6 -2.6436E-01 -7.1815E-01 5.1460E+00 -2.1937E+01 5.7631E+01 -9.4016E+01 9.2725E+01 -5.0202E+01 1.1370E+01 S7 8.0754E-02 -2.5758E-01 2.5753E-01 -9.9162E-02 -1.6604E-01 2.5523E-01 -1.4337E-01 3.7223E-02 -3.7306E-03 S8 1.5527E-01 -2.1501E-01 2.3565E-01 -1.4553E-01 4.6546E-02 -5.5972E-03 -7.4163E-04 2.7996E-04 -2.2235E-05 S9 -1.9838E-01 1.7244E-02 1.8309E-01 -1.4766E-01 5.6143E-02 -1.2248E-02 1.5739E-03 -1.1127E-04 3.3596E-06 S10 -3.8801E-01 3.3484E-01 -2.2205E-01 1.0941E-01 -3.7982E-02 8.8078E-03 -1.2848E-03 1.0582E-04 -3.7277E-06

[0128] Table 4

[0129] Figure 14 The on-axis chromatic aberration curve of the optical system in Example 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical system. Figure 15 The astigmatism curves of the optical system in Example 2 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 16 The distortion curves of the optical system in Example 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 17 The magnification chromatic aberration curve of the optical system in Example 2 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical system.

[0130] according to Figures 14 to 17 As can be seen, the optical system given in Example 2 can achieve good imaging quality.

[0131] Example 3

[0132] like Figures 18 to 25 As shown, an optical system of Example 3 of this application is described. Figure 18 A schematic diagram of the lens structure of the optical system is shown. Figure 19 A schematic diagram of the optical system in Example 3 in its first state is shown. Figure 20 A schematic diagram of the optical system in Example 3 in the second state is shown. Figure 21 A schematic diagram of the optical system in Example 3 in its third state is shown. For the sake of brevity, descriptions similar to those in Example 1 are omitted.

[0133] like Figure 19 As shown, the optical system includes, in sequence from the object side to the image side: first lens E1, first support P1, second lens E2, second support P2, third lens E3, third support P3, fourth lens E4, fourth support P4, fifth lens E5, and fifth support P5.

[0134] exist Figure 19 In this system, all the supporting components are in direct contact with the lens. The second supporting component has the smallest inner diameter to block stray light from both sides, ensuring image quality without affecting the amount of light entering the lens. The fifth supporting component has the largest thickness of all the supporting components and also serves to secure the last lens, preventing it from shifting.

[0135] like Figure 20 and Figure 21 As shown, the optical system, from the object side to the image side, includes the following components in sequence: first lens E1, first support P1, second lens E2, second support P2, third lens E3, third support P3, fourth lens E4, fourth support P4, fifth lens E5, and fifth support P5. The first lens E1 to the third lens E3 are sequentially fastened together, with the support components located inside the fastening structure. The remaining support components are in direct contact with the lenses. The second support component has the smallest inner diameter to intercept stray light from both sides, ensuring image quality without affecting the amount of light entering the lens. The fifth support component also serves to fix the last lens, preventing lens movement.

[0136] The aperture STO is located on the object side of the first lens. The object side S1 of the first lens is convex, and the image side S2 is concave. The object side S3 and image side S4 of the second lens are concave. The object side S5 and image side S6 of the third lens are convex. The object side S7 and image side S8 of the fourth lens are convex. The object side S9 and image side S10 of the fifth lens are concave. The filter E6 has an object side S11 and an image side S12. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S13.

[0137] Table 5 shows the basic structural parameters of the optical system in Example 3, where the units for radius of curvature, thickness / distance, and effective focal length are all millimeters (mm).

[0138] Face number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless -0.2417 S1 aspherical 1.3875 0.4800 1.5520 56.0500 -0.2692 S2 aspherical 4.4579 0.1910 22.4307 S3 aspherical -1470.0070 0.2567 1.7030 19.2700 98.0000 S4 aspherical 6.2885 0.2000 -33.3664 S5 aspherical 9.0023 0.4900 1.5520 56.0500 -98.0000 S6 aspherical -13.8691 0.3840 -96.9635 S7 aspherical 7.0392 0.4500 1.5520 56.0500 -15.9382 S8 aspherical -3.2393 0.4514 -2.2516 S9 aspherical 10.7196 0.4114 1.5430 55.6600 20.2844 S10 aspherical 1.0784 0.2774 -7.7235 S11 spherical endless 0.2100 1.5240 64.2300 S12 spherical endless 0.1681 S13 spherical endless

[0139] Table 5

[0140] Table 6 gives the higher-order coefficients of S1-S10 that can be used for each aspherical lens in Example 3. The surface shape of each aspherical lens can be limited by, but is not limited to, the formula (1) in Example 1.

[0141] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 1.3156E-02 8.5870E-02 -4.2494E-01 1.8380E+00 -4.8657E+00 8.1100E+00 -8.2481E+00 4.6859E+00 -1.1381E+00 S2 -5.6433E-02 3.7944E-02 -3.7802E-01 1.9050E+00 -7.2040E+00 1.7369E+01 -2.6107E+01 2.2128E+01 -8.1970E+00 S3 -1.0858E-01 1.2799E-01 1.1575E-01 -2.4919E+00 1.2822E+01 -3.6673E+01 6.0681E+01 -5.4057E+01 1.9853E+01 S4 -7.3447E-02 3.3778E-01 -1.6310E+00 8.6474E+00 -2.8974E+01 6.0745E+01 -7.6782E+01 5.3552E+01 -1.5822E+01 S5 -1.4170E-01 1.7639E-01 -9.7910E-01 3.9860E+00 -1.0965E+01 1.9632E+01 -2.1730E+01 1.3784E+01 -3.8529E+00 S6 -1.6837E-01 1.7074E-01 -8.5042E-01 2.7015E+00 -5.7402E+00 7.8804E+00 -6.6568E+00 3.1624E+00 -6.4082E-01 S7 -7.6743E-02 2.2896E-02 -8.7350E-03 -6.5988E-02 1.1307E-01 -1.0556E-01 5.7454E-02 -1.5939E-02 1.7253E-03 S8 -6.2936E-02 8.0442E-02 -3.9732E-02 1.8124E-02 -7.5021E-03 2.0808E-03 -3.5872E-04 3.7983E-05 -1.9474E-06 S9 -7.1690E-01 7.4596E-01 -5.4169E-01 3.0446E-01 -1.2033E-01 3.1161E-02 -5.0026E-03 4.5164E-04 -1.7551E-05 S10 -1.9217E-01 1.5762E-01 -8.3459E-02 2.8908E-02 -6.4767E-03 8.9272E-04 -7.0255E-05 2.7674E-06 -3.9982E-08

[0142] Table 6

[0143] Figure 22 The on-axis chromatic aberration curve of the optical system in Example 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical system. Figure 23 The astigmatism curves of the optical system in Example 3 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 24 The distortion curves of the optical system in Example 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles. Figure 25 The magnification chromatic aberration curve of the optical system in Example 3 is shown, which represents the deviation of light at different image heights on the imaging plane after passing through the optical system.

[0144] according to Figures 22 to 25 As can be seen, the optical system given in Example 3 can achieve good imaging quality.

[0145] In summary, Examples 1 to 3 satisfy the relationships shown in Table 7.

[0146] Conditional / Example 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 f5 / (CP4+EP45-CT5) -36.00 -33.60 -19.73 -11.66 -8.17 -13.80 -6.99 -5.48 -6.76 f4 / (CP3+EP34-T34) 7.56 6.23 12.97 14.07 22.34 10.02 15.68 20.42 16.43 |f1+f2| / (EP01+EP12-T12) 6.01 4.84 4.95 9.77 10.23 10.23 5.37 6.07 5.94 R8*(N4-1) / EP34 -1.24 -1.39 -1.40 -1.36 -1.65 -1.18 -2.87 -3.38 -2.93 N1*(R2-R1) / EP01 11.08 8.32 9.18 5.52 6.16 5.98 6.06 7.47 7.06 N5*R10 / EP45 11.67 11.50 11.07 8.41 7.57 9.04 2.34 2.09 2.31 R4*(N2-1) / d2s 1.82 1.82 1.73 4.67 4.68 4.58 2.51 2.51 2.40 (CT1 / (N1-1)) / EP01 1.91 1.44 1.58 1.58 1.77 1.71 1.11 1.36 1.29 (T45*(N4-1)+CT5*N5) / CP5 2.27 4.90 2.27 2.29 2.29 2.29 3.13 3.11 3.11 L / (f*tan(Semi-FOV)) 1.04 1.08 1.12 1.00 1.01 1.00 1.34 1.32 1.28

[0147] Table 7

[0148] Table 8 provides some parameters of the optical systems in Examples 1 to 3.

[0149] Structural parameters / examples 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 d2s 1.6561 1.6512 1.7442 1.4823 1.48 1.5125 1.7602 1.7604 1.842 EP01 0.4962 0.6608 0.5987 0.7048 0.6312 0.651 0.7862 0.6383 0.6748 EP12 0.354 0.3705 0.4129 0.3295 0.3628 0.3431 0.4206 0.4516 0.4337 CP3 0.1222 0.276 0.047 0.022 0.047 0.022 0.022 0.0553 0.022 EP34 0.7258 0.6514 0.6458 0.663 0.5452 0.7641 0.6222 0.5285 0.6103 CP4 0.022 0.022 0.0544 0.022 0.0544 0.022 0.022 0.025 0.022 EP45 0.2742 0.2783 0.2891 0.3948 0.4385 0.3672 0.7097 0.795 0.7206 CP5 0.2844 0.1316 0.2844 0.2844 0.2844 0.2844 0.282 0.2844 0.2844 L 3.3908 3.5511 3.681 3.3793 3.4195 3.3781 3.9801 3.9067 3.7836

[0150] Table 8

[0151] It should be noted that in Tables 7 and 8, 1-1 represents the first state of the optical system in Example 1, 1-2 represents the second state of the optical system in Example 1, and 1-3 represents the third state of the optical system in Example 1. Similarly, 2-1 represents the first state of the optical system in Example 2, 2-2 represents the second state of the optical system in Example 2, 2-3 represents the third state of the optical system in Example 2, 3-1 represents the first state of the optical system in Example 3, 3-2 represents the second state of the optical system in Example 3, and 3-3 represents the third state of the optical system in Example 3.

[0152] Table 9 shows the effective focal lengths of the first to fifth lenses of the optical systems in Examples 1 to 3.

[0153]

[0154]

[0155] Table 9

[0156] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical system described above.

[0157] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0158] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0159] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0160] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An optical system, characterized in that, The optical system comprises five lenses with optical power, and includes: The inner wall of the lens barrel is stepped along the extension direction of the optical axis of the optical system, and the distance from the inner wall of the lens barrel to the optical axis gradually increases from the object side to the image side of the optical system. The first to fifth lenses are sequentially housed in the lens barrel from the object side to the image side of the optical system. The fifth lens has negative optical power and its image side is concave. The first lens has positive optical power, its object side is convex and its image side is concave. The second lens has negative optical power and its image side is concave. The fourth lens has positive optical power and its image side is convex. At least five supporting members, wherein the one that contacts the image side portion of the fourth lens is the fourth supporting member, and the one that contacts the image side portion of the fifth lens is the fifth supporting member; The effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth support member, the distance EP45 between the image side of the fourth support member and the object side of the fifth support member along the optical axis, and the center thickness CT5 of the fifth lens satisfy the following condition: -36.00≤f5 / (CP4+EP45-CT5)≤-5.48; The air gap T45 between the fourth and fifth lenses on the optical axis, the center thickness CT5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the maximum thickness CP5 of the fifth support member satisfy the following condition: 2.27≤(T45*(N4-1)+CT5*N5) / CP5≤4.

90.

2. The optical system according to claim 1, characterized in that, The third support member is the one that contacts the image side of the third lens. The effective focal length f4 of the fourth lens, the maximum thickness CP3 of the third support member, the distance EP34 between the image side of the third support member and the object side of the fourth support member along the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy the following: 6.23≤f4 / (CP3+EP34-T34)≤22.

34.

3. The optical system according to claim 1, characterized in that, The first support member is the one that contacts the image-side surface of the first lens, and the second support member is the one that contacts the image-side surface of the second lens. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first support member along the optical axis, the distance EP12 between the image-side surface of the first support member and the object-side surface of the second support member along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 4.84≤|f1+f2| / (EP01+EP12-T12)≤10.

23.

4. The optical system according to claim 1, characterized in that, The third support member is the one that contacts the image side of the third lens. The radius of curvature R8 of the image side of the fourth lens, the refractive index N4 of the fourth lens, and the distance EP34 between the image side of the third support member and the object side of the fourth support member along the optical axis satisfy the following: -3.38≤R8*(N4-1) / EP34≤-1.

18.

5. The optical system according to claim 1, characterized in that, The first support member is the one that contacts the image side of the first lens. The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the distance EP01 from the object side end face of the lens barrel to the object side of the first support member along the optical axis, and the refractive index N1 of the first lens satisfy the following: 5.52≤N1*(R2-R1) / EP01≤11.

08.

6. The optical system according to claim 1, characterized in that, The radius of curvature R10 of the image side of the fifth lens, the refractive index N5 of the fifth lens, and the distance EP45 between the image side of the fourth support member and the object side of the fifth support member along the optical axis satisfy the following condition: 2.09≤N5*R10 / EP45≤11.

67.

7. The optical system according to claim 1, characterized in that, Among the plurality of supporting members, the one that contacts the image side of the second lens is the second supporting member. The radius of curvature R4 of the image side of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object side of the second supporting member satisfy the following: 1.73≤R4*(N2-1) / d2s≤4.

68.

8. The optical system according to claim 1, characterized in that, The first support member is the one that contacts the image side of the first lens. The center thickness CT1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 between the object side end face of the lens barrel and the object side face of the first support member along the optical axis satisfy the following: 1.11≤(CT1 / (N1-1)) / EP01≤1.

91.

9. The optical system according to any one of claims 1 to 8, characterized in that, The maximum height L of the lens barrel, the effective focal length f of the optical system, and the maximum semi-FOV of the optical system satisfy the following condition: 1.00≤L / (f*tan(Semi-FOV))≤1.

34.

10. The optical system according to any one of claims 1 to 8, characterized in that, The radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy the following condition: R2>R1>0.

11. The optical system according to any one of claims 1 to 8, characterized in that, The effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the condition: |f2|>|f5|.

12. The optical system according to any one of claims 1 to 8, characterized in that, Among the first to the fifth lenses, the third lens has the largest absolute value of effective focal length.

13. An optical system, characterized in that, The optical system comprises five lenses with optical power, and includes: The inner wall of the lens barrel is stepped along the extension direction of the optical axis of the optical system, and the distance from the inner wall of the lens barrel to the optical axis gradually increases from the object side to the image side of the optical system. The first to fifth lenses are sequentially housed in the lens barrel from the object side to the image side of the optical system. The fifth lens has negative optical power and its image side is concave. The first lens has positive optical power, its object side is convex and its image side is concave. The second lens has negative optical power and its image side is concave. The fourth lens has positive optical power and its image side is convex. At least five supporting members, wherein the one that contacts the image side portion of the third lens is the third supporting member, the one that contacts the image side portion of the fourth lens is the fourth supporting member, and the one that contacts the image side portion of the fifth lens is the fifth supporting member among the plurality of supporting members. Wherein, the effective focal length f4 of the fourth lens, the maximum thickness CP3 of the third support member, the distance EP34 between the image side of the third support member and the object side of the fourth support member along the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 6.23≤f4 / (CP3+EP34-T34)≤22.34; The air gap T45 between the fourth and fifth lenses on the optical axis, the center thickness CT5 of the fifth lens, the refractive index N4 of the fourth lens, the refractive index N5 of the fifth lens, and the maximum thickness CP5 of the fifth support member satisfy the following condition: 2.27≤(T45*(N4-1)+CT5*N5) / CP5≤4.

90.

14. The optical system according to claim 13, characterized in that, The first support member is the one that contacts the image-side surface of the first lens, and the second support member is the one that contacts the image-side surface of the second lens. The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the distance EP01 between the object-side end face of the lens barrel and the object-side surface of the first support member along the optical axis, the distance EP12 between the image-side surface of the first support member and the object-side surface of the second support member along the optical axis, and the air gap T12 between the first lens and the second lens on the optical axis satisfy the following: 4.84≤|f1+f2| / (EP01+EP12-T12)≤10.

23.

15. The optical system according to claim 13, characterized in that, The radius of curvature R8 of the image side of the fourth lens, the refractive index N4 of the fourth lens, and the distance EP34 between the image side of the third support member and the object side of the fourth support member along the optical axis satisfy the following: -3.38≤R8*(N4-1) / EP34≤-1.

18.

16. The optical system according to claim 13, characterized in that, The first support member is the one that contacts the image side of the first lens. The radius of curvature R1 of the object side of the first lens, the radius of curvature R2 of the image side of the first lens, the distance EP01 from the object side end face of the lens barrel to the object side of the first support member along the optical axis, and the refractive index N1 of the first lens satisfy the following: 5.52≤N1*(R2-R1) / EP01≤11.

08.

17. The optical system according to claim 13, characterized in that, The radius of curvature R10 of the image side of the fifth lens, the refractive index N5 of the fifth lens, and the distance EP45 between the image side of the fourth support member and the object side of the fifth support member along the optical axis satisfy the following condition: 2.09≤N5*R10 / EP45≤11.

67.

18. The optical system according to claim 13, characterized in that, Among the plurality of supporting members, the one that contacts the image side of the second lens is the second supporting member. The radius of curvature R4 of the image side of the second lens, the refractive index N2 of the second lens, and the inner diameter d2s of the object side of the second supporting member satisfy the following: 1.73≤R4*(N2-1) / d2s≤4.

68.

19. The optical system according to claim 13, characterized in that, The first support member is the one that contacts the image side of the first lens. The center thickness CT1 of the first lens, the refractive index N1 of the first lens, and the distance EP01 between the object side end face of the lens barrel and the object side face of the first support member along the optical axis satisfy the following: 1.11≤(CT1 / (N1-1)) / EP01≤1.

91.

20. The optical system according to any one of claims 13 to 19, characterized in that, The maximum height L of the lens barrel, the effective focal length f of the optical system, and the maximum semi-FOV of the optical system satisfy the following condition: 1.00≤L / (f*tan(Semi-FOV))≤1.

34.

21. The optical system according to any one of claims 13 to 19, characterized in that, The radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens satisfy the following condition: R2>R1>0.

22. The optical system according to any one of claims 13 to 19, characterized in that, The effective focal length f2 of the second lens and the effective focal length f5 of the fifth lens satisfy the condition: |f2|>|f5|.

23. The optical system according to any one of claims 13 to 19, characterized in that, Among the first to the fifth lenses, the third lens has the largest absolute value of effective focal length.

Images