Optical imaging system

Abstract

The application discloses an optical imaging system, which comprises a lens barrel, a six-piece lens group and a spacer group arranged in the lens barrel, the six-piece lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens arranged in sequence from an object side to an image side along an optical axis, wherein the fifth lens has positive refractive power, and the sixth lens has negative refractive power; the spacer group comprises a fifth spacer arranged on the image side of the fifth lens and in contact with the image side of the fifth lens; wherein the effective focal length f6 of the sixth lens, the air interval T56 of the fifth lens and the sixth lens on the optical axis, the inner diameter d5m of the image side of the fifth spacer and the outer diameter D5m of the image side of the fifth spacer satisfy: -120mm < f6 x (D5m + d5m) / T56 < -80mm.

Description

Technical Field

[0001] This application relates to the field of optical devices, specifically to a six-element optical imaging system. Background Technology

[0002] With the continuous development of science and technology, higher requirements are being placed on the imaging function of optical imaging systems in portable electronic devices such as smartphones. For example, optical imaging systems need to have high imaging quality.

[0003] In an optical imaging system, the last two lenses typically need to correct field curvature and aberrations. They are designed with significant surface curvature, making them particularly sensitive during assembly due to the substantial changes in their curvature. Furthermore, to match the image plane, the last two lenses in a six-element optical imaging system typically have large outer diameters. However, this large outer diameter can easily create large step-off structures, which can cause unwanted light rays to enter the image plane, thus affecting the image quality of the optical imaging system. Additionally, the close proximity of the last two lenses increases their susceptibility to collisions, further reducing the yield rate of the optical imaging system. Summary of the Invention

[0004] This application provides an optical imaging system that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] One aspect of this application provides an optical imaging system comprising a lens barrel and a six-element lens group and a spacer group disposed within the lens barrel. The six-element lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side, wherein the fifth lens has positive optical power and the sixth lens has negative optical power; the spacer group includes a fifth spacer disposed on and in contact with the image side surface of the fifth lens; wherein the effective focal length f6 of the sixth lens, the air gap T56 between the fifth and sixth lenses on the optical axis, the inner diameter d5m of the image side surface of the fifth spacer, and the outer diameter D5m of the image side surface of the fifth spacer satisfy: -120mm. <f6×(D5m+d5m) / T56<-80mm。

[0006] According to an exemplary embodiment of this application, the effective focal length f5 of the fifth lens, the inner diameter d5s of the object-side surface of the fifth spacer, the outer diameter D5s of the object-side surface of the fifth spacer, and the maximum thickness CP5 of the fifth spacer satisfy: 10mm <f5×(D5s-d5s) / CP5<31mm。

[0007] According to an exemplary embodiment of this application, the radius of curvature R11 of the object side of the sixth lens, the radius of curvature R12 of the image side of the sixth lens, the inner diameter d0m of the image side end face of the lens barrel and the outer diameter D0m of the image side end face of the lens barrel satisfy: -46<(R12-R11) / (D0m-d0m)<-8.

[0008] According to an exemplary embodiment of this application, the inner diameter d0s of the object-side end face of the lens barrel, the outer diameter D0s of the object-side end face of the lens barrel, the total effective focal length f of the optical imaging system and the aperture number Fno of the optical imaging system satisfy: 3<(D0s+d0s) / f×Fno<6.

[0009] According to an exemplary embodiment of this application, the spacer assembly further includes a fourth spacer disposed on and in contact with the image-side surface of the fourth lens, wherein the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, the air gap T45 between the fourth and fifth lenses on the optical axis, the inner diameter d4s of the object-side surface of the fourth spacer, and the outer diameter D4m of the image-side surface of the fourth spacer satisfy: 5mm < (R8-R9)×(D4m-d4s) / T45 < 27mm.

[0010] According to an exemplary embodiment of this application, the spacer assembly further includes a fourth spacer disposed on and in contact with the image-side surface of the fourth lens, and a fourth auxiliary spacer disposed on and in contact with the image-side surface of the fourth spacer, wherein the radius of curvature R10 of the image-side surface of the fifth lens, the air gap T45 between the fourth and fifth lenses on the optical axis, the maximum thickness CP4 of the fourth spacer, and the maximum thickness CP4b of the fourth auxiliary spacer satisfy: 9 <R10 / (CP4+T45+CP4b)<35。

[0011] According to an exemplary embodiment of this application, the spacer assembly further includes a third spacer disposed on and in contact with the image-side surface of the third lens, and a fourth spacer disposed on and in contact with the image-side surface of the fourth lens, wherein the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the radius of curvature R7 of the object-side surface of the fourth lens, and the spacing EP34 of the third and fourth spacers in the direction parallel to the optical axis satisfy: 0 <R7 / (N3+N4)×EP34<4。

[0012] According to an exemplary embodiment of this application, the spacer group further includes a third spacer disposed on and in contact with the image side of the third lens, wherein the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter d3m of the image side of the third spacer and the outer diameter D3m of the image side of the third spacer satisfy: 10<|f3-f4| / (D3m-d3m)<44.

[0013] According to an exemplary embodiment of this application, the spacer group further includes a second spacer disposed on the image-side surface of the second lens and in contact with the image-side surface of the second lens, and a third spacer disposed on the image-side surface of the third lens and in contact with the image-side surface of the third lens, wherein the effective focal length f2 of the second lens, the Abbe number V2 of the second lens, the Abbe number V3 of the third lens, and the spacing EP23 of the second spacer and the third spacer in the direction parallel to the optical axis satisfy: -6<(V3+V2)×EP23 / f2<-1.

[0014] According to an exemplary embodiment of this application, the spacer assembly further includes a second spacer disposed on and in contact with the image-side surface of the second lens, wherein the radius of curvature R4 of the image-side surface of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the inner diameter d2m of the image-side surface of the second spacer, and the outer diameter D2m of the image-side surface of the second spacer satisfy: 32mm <R4×(D2m+d2m) / T23<70mm。

[0015] According to an exemplary embodiment of this application, the spacer assembly further includes a first spacer disposed on and in contact with the image-side surface of the first lens, and a second spacer disposed on and in contact with the image-side surface of the second lens, wherein the radius of curvature R3 of the object-side surface of the second lens, the inner diameter d1m of the image-side surface of the first spacer, the inner diameter d2s of the object-side surface of the second spacer, and the spacing EP12 between the first spacer and the second spacer in a direction parallel to the optical axis satisfy: -12mm <R3×(d2s-d1m) / EP12<0mm。

[0016] According to an exemplary embodiment of this application, the spacer assembly further includes a first spacer disposed on and in contact with the image-side surface of the first lens, wherein the effective focal length f1 of the first lens, the length L of the lens barrel in the direction of the optical axis, and the distance EP01 between the object-side end face of the lens barrel and the first spacer in the direction parallel to the optical axis satisfy: 25mm. <L×f1 / EP01<45mm。

[0017] According to an exemplary embodiment of this application, the spacer assembly further includes a first spacer disposed on and in contact with the image side of the first lens, wherein 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 inner diameter d1s of the object side of the first spacer, and the outer diameter D1s of the object side of the first spacer satisfy: 2<(R2×D1s) / (R1×d1s)<18.

[0018] According to an exemplary embodiment of this application, the spacer assembly further includes a sixth spacer disposed on and in contact with the image-side surface of the sixth lens, wherein the effective focal length f6 of the sixth lens, the inner diameter d6s of the object-side surface of the sixth spacer, and the outer diameter D6s of the object-side surface of the sixth spacer satisfy: -9 <f6 / (D6s-d6s)<-3。

[0019] According to an exemplary embodiment of this application, the spacer group further includes a fifth auxiliary spacer disposed on and in contact with the image side of the fifth spacer and a sixth spacer disposed on and in contact with the image side of the sixth lens, wherein the radius of curvature R9 of the object side of the fifth lens, the radius of curvature R12 of the image side of the sixth lens, the inner diameter d5bs of the object side of the fifth auxiliary spacer, the outer diameter D5bm of the image side of the fifth auxiliary spacer, and the spacing EP56 between the fifth spacer and the sixth spacer in the direction parallel to the optical axis satisfy: 70mm < (d5bs × R9 + D5bm × R12) / EP56 < 90mm.

[0020] The six-element optical imaging system provided in this application reduces the amount of invalid light entering the image plane, improves stray light phenomena, and enhances the imaging quality of the optical imaging system by limiting the inner and outer diameters of the fifth spacer within a reasonable range. At the same time, by constraining the air gap between the fifth and sixth lenses on the optical axis, it avoids collisions between the fifth and sixth lenses due to their close proximity, thereby improving the yield of the optical imaging system. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 A schematic diagram of the structure of the optical imaging system according to this application is shown;

[0023] Figure 2 A schematic diagram of the structure of an optical imaging system according to Embodiment 1 of the first embodiment of this application is shown;

[0024] Figure 3 A schematic diagram of the structure of an optical imaging system according to Embodiment 2 of the first embodiment of this application is shown;

[0025] Figure 4 A schematic diagram of the structure of an optical imaging system according to Embodiment 3 of the first embodiment of this application is shown;

[0026] Figures 5A to 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to the first embodiment of this application are shown respectively.

[0027] Figure 6 A schematic diagram of the structure of an optical imaging system according to Embodiment 1 of the second embodiment of this application is shown;

[0028] Figure 7 A schematic diagram of the structure of an optical imaging system according to Embodiment 2 of the second embodiment of this application is shown;

[0029] Figure 8 A schematic diagram of the structure of an optical imaging system according to Embodiment 3 of the second embodiment of this application is shown;

[0030] Figures 9A to 9D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to the second embodiment of this application are shown respectively.

[0031] Figure 10 A schematic diagram of the structure of an optical imaging system according to Embodiment 1 of the third embodiment of this application is shown;

[0032] Figure 11 A schematic diagram of the structure of an optical imaging system according to Embodiment 2 of the third embodiment of this application is shown;

[0033] Figure 12 A schematic diagram of the structure of an optical imaging system according to Embodiment 3 of the third embodiment of this application is shown; and

[0034] Figures 13A to 13D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging system according to the third embodiment of this application are shown respectively. Detailed Implementation

[0035] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0036] 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 lens or the third lens.

[0037] 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.

[0038] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the 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 the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0039] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising" as used in this specification indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0040] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0041] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] The features, principles and other aspects of this application are described in detail below.

[0043] like Figures 2 to 4 , Figures 6 to 8 as well as Figures 10 to 12 As shown, the first aspect of this application provides an optical imaging system that may include a six-lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side. An air gap may exist between any two adjacent lenses in the first to sixth lenses.

[0044] In an exemplary embodiment, the first lens may have positive optical power.

[0045] In an exemplary embodiment, the second lens may have negative optical power.

[0046] In an exemplary embodiment, the third lens may have positive optical power.

[0047] In an exemplary embodiment, the fourth lens may have positive or negative optical power.

[0048] In an exemplary embodiment, the fifth lens may have positive optical power.

[0049] In an exemplary embodiment, the sixth lens may have negative optical power.

[0050] In an exemplary embodiment, the optical imaging system may further include a group of spacers, which may include one or more of a first spacer, a second spacer, a third spacer, a fourth spacer, a fourth auxiliary spacer, a fifth spacer, a fifth auxiliary spacer, and a sixth spacer. Specifically, the first spacer may be placed on and in contact with the image-side surface of the first lens; the second spacer may be placed on and in contact with the image-side surface of the second lens; the third spacer may be placed on and in contact with the image-side surface of the third lens; the fourth spacer may be placed on and in contact with the image-side surface of the fourth lens; the fourth auxiliary spacer may be placed on and in contact with the image-side surface of the fourth spacer; the fifth spacer may be placed on and in contact with the image-side surface of the fifth lens; the fifth auxiliary spacer may be placed on and in contact with the image-side surface of the fifth spacer; and the sixth spacer may be placed on and in contact with the image-side surface of the sixth lens. Proper use of spacers can effectively avoid stray light risks, reduce interference with image quality, and thus improve the imaging quality of the optical imaging system.

[0051] In an exemplary embodiment, the optical imaging system may further include a lens barrel. The six-element lens group and the spacer group are both housed within the lens barrel.

[0052] In an exemplary embodiment, the effective focal length f6 of the sixth lens, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the inner diameter d5m of the image side surface of the fifth spacer and the outer diameter D5m of the image side surface of the fifth spacer may satisfy: -120 mm < f6 × (D5m + d5m) / T56 < -80 mm. By controlling the above conditional expression, the inner and outer diameters of the fifth spacer can be limited within a reasonable range, reducing the entry of ineffective light rays into the image plane, improving the stray light phenomenon of the optical imaging system, and enhancing the imaging quality of the optical imaging system; at the same time, the air gap between the fifth lens and the sixth lens on the optical axis can also be restricted, preventing the fifth lens and the sixth lens from colliding due to being too close to each other, and increasing the yield rate of the optical imaging system.

[0053] In an exemplary embodiment, the effective focal length f5 of the fifth lens, the inner diameter d5s of the object side surface of the fifth spacer, the outer diameter D5s of the object side surface of the fifth spacer, and the maximum thickness CP5 of the fifth spacer may satisfy: 10 mm < f5 × (D5s - d5s) / CP5 < 31 mm. In an example, 15 mm < f5 × (D5s - d5s) / CP5 < 27 mm. By controlling the above conditional expression, the effective focal length of the fifth lens can be restricted, facilitating the correction of the meridional astigmatism and off-axis coma of the optical imaging system; at the same time, the inner and outer diameters of the object side surface of the fifth spacer and the maximum thickness of the fifth spacer can also be restricted, which is beneficial to improving the stray light phenomenon of the optical imaging system and increasing the process yield rate of the optical imaging system.

[0054] In an exemplary embodiment, the radius of curvature R11 of the object side surface of the sixth lens, the radius of curvature R12 of the image side surface of the sixth lens, the inner diameter d0m of the image side end surface of the lens barrel and the outer diameter D0m of the image side end surface of the lens barrel may satisfy: -46 < (R12 - R11) / (D0m - d0m) < -8. By controlling the above conditional expression, the radii of curvature of the object side surface and the image side surface of the sixth lens can be restricted, enabling the light rays to be deflected within a certain range when passing through the sixth lens, which is beneficial to reducing the sensitivity of the sixth lens; at the same time, the inner and outer diameters of the image side end surface of the lens barrel can also be restricted, making the wall thickness of the image side end surface of the lens barrel within a reasonable range, which is beneficial to the molding of the lens barrel, and making the image side end surface of the lens barrel not easily deformed when it abuts against the sixth lens, ensuring that the optical imaging system has good quality stability and appearance.

[0055] In an exemplary embodiment, the inner diameter d0s of the object-side end face of the lens barrel, the outer diameter D0s of the object-side end face of the lens barrel, the total effective focal length f of the optical imaging system, and the f-number Fno of the optical imaging system may satisfy: 3 < (D0s + d0s) / f × Fno < 6. In an example, 3.9 < (D0s + d0s) / f × Fno < 4.8. By controlling the above conditional expression, the size of the object-side end face of the lens barrel and the f-number of the optical imaging system can be constrained within a reasonable range, ensuring that the optical imaging system has sufficient light transmission, enhancing the overall picture brightness of the optical imaging system, making the colors of the picture after imaging by the optical imaging system more saturated, and also being beneficial to the molding of the lens barrel; at the same time, it can also limit the total effective focal length of the optical imaging system, facilitating the constraint of the length of the lens barrel in the direction of the optical axis within a certain range, which is beneficial to the miniaturization of the optical imaging system.

[0056] In an exemplary embodiment, the radius of curvature R8 of the image-side surface of the fourth lens, the radius of curvature R9 of the object-side surface of the fifth lens, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the inner diameter d4s of the object-side surface of the fourth spacer, and the outer diameter D4m of the image-side surface of the fourth spacer may satisfy: 5 mm < (R8 - R9) × (D4m - d4s) / T45 < 27 mm. In an example, 10 mm < (R8 - R9) × (D4m - d4s) / T45 < 23 mm. By controlling the above conditional expression, the radii of curvature of the image-side surface of the fourth lens and the object-side surface of the fifth lens can be restricted, such that the total deflection angle of the marginal field of view on these two surfaces is within a reasonable range, effectively reducing the sensitivity of the optical imaging system; at the same time, it can also constrain the inner diameter of the object-side surface of the fourth spacer and the outer diameter of the image-side surface of the fourth spacer, reducing costs while ensuring the performance and optical parameters of the optical imaging system, improving the molding stability of the fourth spacer, and reducing the displacement of the previous components.

[0057] In an exemplary embodiment, the radius of curvature R10 of the image-side surface of the fifth lens, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the maximum thickness CP4 of the fourth spacer, and the maximum thickness CP4b of the fourth auxiliary spacer may satisfy: 9 < R10 / (CP4 + T45 + CP4b) < 35. By controlling the above conditional expression, it is beneficial to reasonably allocate the relative positions of the fourth lens, the fourth spacer, the fourth auxiliary spacer, and the fifth lens, thereby reducing the stray light risk of the optical imaging system.

[0058] In an exemplary embodiment, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the radius of curvature R7 of the object side surface of the fourth lens, and the interval EP34 between the third spacer and the fourth spacer in the direction parallel to the optical axis may satisfy: 0 < R7 / (N3 + N4)×EP34 < 4. In an example, 1 < R7 / (N3 + N4)×EP34 < 2.5. By controlling the above conditional expression, it is possible to limit the refractive indices of the third lens and the fourth lens while making the radius of curvature of the object side surface of the fourth lens fall within a certain range, which is beneficial to improving the assembly stability of the optical imaging system and the stray light improvement space, and effectively improving the aberration of the optical imaging system; at the same time, it is also possible to constrain the interval between the third spacer and the fourth spacer in the direction parallel to the optical axis, enabling the optical imaging system to be miniaturized.

[0059] In an exemplary embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter d3m of the image side surface of the third spacer, and the outer diameter D3m of the image side surface of the third spacer may satisfy: 10 < |f3 - f4| / (D3m - d3m) < 44. By controlling the above conditional expression, it is possible to limit the effective focal lengths of the third lens and the fourth lens, facilitating the correction of the meridional astigmatism and off-axis coma of the optical imaging system; at the same time, it is also possible to constrain the inner and outer diameters of the image side surface of the third spacer, which is beneficial to improving the stray light phenomenon of the optical imaging system and increasing the manufacturing yield rate of the optical imaging system.

[0060] In an exemplary embodiment, the effective focal length f2 of the second lens, the Abbe number V2 of the second lens, the Abbe number V3 of the third lens, and the interval EP23 between the second spacer and the third spacer in the direction parallel to the optical axis may satisfy: -6 < (V3 + V2)×EP23 / f2 < -1. In an example, -5 < (V3 + V2)×EP23 / f2 < -3.5. By controlling the above conditional expression, it is possible to make the distortion contribution amounts of each field of view of the optical imaging system fall within a reasonable range, ensuring that the distortion amount of the optical imaging system is less than or equal to 3%; at the same time, it is also possible to limit the interval between the second spacer and the third spacer in the direction parallel to the optical axis within a reasonable range, effectively improving the stray light between the second lens and the third lens.

[0061] In an exemplary embodiment, the radius of curvature R4 of the image side surface of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the inner diameter d2m of the image side surface of the second spacer, and the outer diameter D2m of the image side surface of the second spacer may satisfy: 32 mm < R4×(D2m + d2m) / T23 < 70 mm. By controlling the above conditional expression, it is possible to limit the radius of curvature of the image side surface of the second lens and the inner and outer diameters of the image side surface of the second spacer, so that the deflection angle of the marginal field of view on the image side surface of the second lens is within a reasonable range, effectively reducing the sensitivity of the optical imaging system; at the same time, it is also possible to constrain the air gap between the second lens and the third lens on the optical axis, effectively adjusting the field curvature of the optical imaging system and improving the quality of the optical imaging system.

[0062] In an exemplary embodiment, the radius of curvature R3 of the object side surface of the second lens, the inner diameter d1m of the image side surface of the first spacer, the inner diameter d2s of the object side surface of the second spacer, and the gap EP12 between the first spacer and the second spacer in a direction parallel to the optical axis may satisfy: -12 mm < R3×(d2s - d1m) / EP12 < 0 mm. By controlling the above conditional expression, it is possible to limit the radius of curvature of the object side surface of the second lens, the inner diameter of the image side surface of the first spacer, the inner diameter of the object side surface of the second spacer, and the gap between the first spacer and the second spacer in a direction parallel to the optical axis, which is beneficial to improving the product reliability of the optical imaging system, avoiding stray light, and improving the imaging quality of the optical imaging system.

[0063] In an exemplary embodiment, the effective focal length f1 of the first lens, the length L of the lens barrel in the direction of the optical axis, and the gap EP01 between the object side end surface of the lens barrel and the first spacer in a direction parallel to the optical axis may satisfy: 25 mm < L×f1 / EP01 < 45 mm. In an example, 30 mm < L×f1 / EP01 < 40.5 mm. By controlling the above conditional expression, it is possible to make the length of the lens barrel in the direction of the optical axis within a reasonable range, which is beneficial to the miniaturization of the optical imaging system; at the same time, it is also possible to constrain the effective focal length of the first lens and the gap between the object side end surface of the lens barrel and the first spacer in a direction parallel to the optical axis, effectively reducing the forming difficulty of the first lens and improving the assembly and performance stability of the optical imaging system.

[0064] In an exemplary embodiment, 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 inner diameter d1s of the object side surface of the first spacer, and the outer diameter D1s of the object side surface of the first spacer may satisfy: 2 < (R2 × D1s) / (R1 × d1s) < 18. In an example, 8 < (R2 × D1s) / (R1 × d1s) < 13. By controlling the above conditional expression, it is possible to limit the radii of curvature of the object side surface and the image side surface of the first lens, which is beneficial to balancing the high-order spherical aberration of the optical imaging system; at the same time, it is also possible to constrain the inner and outer diameters of the object side surface of the first spacer, effectively improving the stray light phenomenon of the optical imaging system, reducing the deformation probability of the first spacer, and enhancing the yield of the optical imaging system.

[0065] In an exemplary embodiment, the effective focal length f6 of the sixth lens, the inner diameter d6s of the object side surface of the sixth spacer, and the outer diameter D6s of the object side surface of the sixth spacer may satisfy: -9 < f6 / (D6s - d6s) < -3. In an example, -8 < f6 / (D6s - d6s) < -5. By controlling the above conditional expression, it is possible to limit the effective focal length of the sixth lens and the inner and outer diameters of the object side surface of the sixth spacer, which is beneficial to reducing the optical power of the sixth lens, reducing the error sensitivity of product manufacturing, and enhancing the imaging quality of the optical imaging system.

[0066] In an exemplary embodiment, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R12 of the image side surface of the sixth lens, the inner diameter d5bs of the object side surface of the fifth auxiliary spacer, the outer diameter D5bm of the image side surface of the fifth auxiliary spacer, and the interval EP56 between the fifth spacer and the sixth spacer in the direction parallel to the optical axis may satisfy: 70 mm < (d5bs × R9 + D5bm × R12) / EP56 < 90 mm. By controlling the above conditional expression, it is possible to limit the radius of curvature of the object side surface of the fifth lens, the radius of curvature of the image side surface of the sixth lens, the step difference of the fifth auxiliary spacer, and the interval between the fifth spacer and the sixth spacer in the direction parallel to the optical axis, which is beneficial to balancing the high-order spherical aberration of the optical imaging system.

[0067] In an exemplary embodiment, the optical imaging system may further include an aperture stop, and the aperture stop may be disposed between the object side and the first lens according to actual needs.

[0068] The optical imaging system according to the above embodiment of the present application may employ six lenses and multiple spacers. By reasonably allocating the parameters of each lens, each spacer, and the lens barrel, it is possible to reduce the sensitivity of the optical imaging system, improve the stray light phenomenon of the optical imaging system, enhance the imaging quality and yield of the optical imaging system, and facilitate the miniaturization of the optical imaging system.

[0069] In embodiments of this application, at least one of the mirror surfaces of the first to sixth lenses is an aspherical mirror surface. An aspherical lens is characterized by a continuously changing curvature from its center to its periphery. Unlike a spherical lens, which has a constant curvature from its center to its periphery, an aspherical lens has superior curvature radius characteristics, offering advantages in improving distortion and astigmatism. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, both the object-side and image-side surfaces of the first to sixth lenses are aspherical mirror surfaces.

[0070] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses and spacers constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification.

[0071] A second aspect of this application provides an optical imaging system that may include a lens barrel and a six-lens group disposed within the lens barrel. The six-lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side. An air gap may exist between any two adjacent lenses, from the first to the sixth lens.

[0072] Specifically, the radius of curvature R11 of the object-side surface of the sixth lens, the radius of curvature R12 of the image-side surface of the sixth lens, the inner diameter d0m of the image-side end face of the lens barrel, and the outer diameter D0m of the image-side end face of the lens barrel can satisfy: -46 < (R12 - R11) / (D0m - d0m) < -8. By limiting the radius of curvature of the object-side and image-side surfaces of the sixth lens, light rays can be deflected within a certain range when passing through the sixth lens, which helps to reduce the sensitivity of the sixth lens. At the same time, by constraining the inner and outer diameters of the image-side end face of the lens barrel, the wall thickness of the image-side end face of the lens barrel can be kept within a reasonable range, which is beneficial to the shaping of the lens barrel and makes the image-side end face of the lens barrel less prone to deformation when the sixth lens rests on it, ensuring that the optical imaging system has good quality stability and appearance.

[0073] A third aspect of this application provides an optical imaging system that may include a lens barrel and a six-lens group disposed within the lens barrel. The six-lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object side to the image side. An air gap may exist between any two adjacent lenses, from the first to the sixth lens.

[0074] The optical imaging system may further include a spacer group, and the spacer group may include a first spacer disposed on the image side of the first lens and in contact with the image side of the first lens. Among them, the effective focal length f1 of the first lens, the length L of the lens barrel in the direction of the optical axis, and the interval EP01 between the object-side end face of the lens barrel and the first spacer in the direction parallel to the optical axis may satisfy: 25 mm < L × f1 / EP01 < 45 mm. In an example, 30 mm < L × f1 / EP01 < 40.5 mm. By making the length of the lens barrel in the direction of the optical axis within a reasonable range, the miniaturization of the optical imaging system can be achieved; at the same time, by restricting the effective focal length of the first lens and the interval between the object-side end face of the lens barrel and the first spacer in the direction parallel to the optical axis, the molding difficulty of the first lens can be effectively reduced, and the stability of the assembly and performance of the optical imaging system can be improved.

[0075] The specific embodiments of the optical imaging system applicable to the above embodiments will be further described below with reference to the drawings.

[0076] First embodiment

[0077] The following refers to Figures 2 to 5D Describe the optical imaging system according to the first embodiment of the present application. Figure 2 FIG. 13 shows a schematic structural diagram of an optical imaging system 110 according to Embodiment 1 of the first embodiment of the present application; Figure 3 FIG. 15 shows a schematic structural diagram of an optical imaging system 120 according to Embodiment 2 of the first embodiment of the present application; Figure 4 FIG. 17 shows a schematic structural diagram of an optical imaging system 130 according to Embodiment 3 of the first embodiment of the present application.

[0078] As Figures 2 to 4 shown, the optical imaging systems 110, 120, and 130 all include a lens barrel and a six-piece lens group and a spacer group disposed in the lens barrel. The six-piece lens group includes, in order from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The aperture stop STO may be disposed between the object side and the first lens E1. The spacer group includes: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth spacer P6. The spacer can block the excess light in the imaging process from entering the next lens, and at the same time make the lens and the lens barrel better bear against each other, enhancing the structural stability of the optical imaging system.

[0079] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter has an object-side surface S13 (not shown) and an image-side surface S14 (not shown). Light from the object passes sequentially through each surface S1 to S14 and is finally imaged onto the imaging surface S15 (not shown).

[0080] Table 1 shows the basic parameters of the optical imaging system of the first embodiment, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0081]

[0082] Table 1

[0083] In this embodiment, the total effective focal length f of the optical imaging system is 5.5620 mm, and the aperture number Fno of the optical imaging system is 1.9558.

[0084] In the first embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0085]

[0086] Where x is the distance vector from the vertex of the aspherical surface at a height of 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 gives the higher-order coefficients A4, A6, A8, A12 that can be used for each aspherical mirror S1-S12 in the first embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0087] Face number A4 A6 A8 A10 A12 A14 A16 S1 2.3129E-03 -2.8440E-03 -1.4580E-03 -4.5475E-04 -1.8212E-04 -4.9818E-05 -2.6787E-05 S2 -4.5820E-02 8.0341E-03 -3.9552E-03 6.0600E-04 -3.9358E-04 3.9769E-05 -3.7826E-05 S3 -4.4749E-02 1.7139E-02 -3.1734E-03 8.9779E-04 -3.3734E-04 1.1648E-04 -4.7508E-06 S4 2.0925E-02 9.8201E-03 1.0468E-03 3.5722E-04 4.6176E-05 2.3958E-06 3.6360E-06 S5 -9.8738E-02 -7.6879E-04 3.6302E-03 1.8888E-03 6.9342E-04 1.3312E-04 -2.2699E-05 S6 -2.9770E-01 -8.2741E-03 1.1575E-02 7.8560E-03 3.7136E-03 1.5284E-03 4.8039E-04 S7 -8.3099E-01 1.2760E-02 -4.2734E-03 9.2499E-04 -3.5912E-03 1.2691E-03 1.2033E-03 S8 -1.1894E+00 3.4398E-01 -6.9915E-02 -9.4199E-03 1.3588E-03 6.3458E-03 -2.6440E-03 S9 -2.1445E+00 3.1142E-01 1.2810E-01 -3.3016E-02 -1.8232E-02 -3.6170E-03 3.7734E-03 S10 -1.5019E+00 -2.6930E-01 7.5176E-02 -7.8314E-03 5.5319E-02 1.1484E-02 7.2572E-04 S11 -3.2040E+00 1.3107E+00 -5.6160E-01 2.7906E-01 -1.3530E-01 4.2697E-02 -1.5970E-02 S12 -8.2791E+00 2.0232E+00 -5.5994E-01 2.3876E-01 -1.2730E-01 5.1451E-02 -3.7334E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 1.8121E-06 1.8625E-06 7.3876E-06 4.8702E-06 4.1467E-06 -5.0661E-08 -7.5397E-07 S2 5.2148E-06 -1.8313E-06 2.0680E-06 -8.4848E-07 9.8602E-07 1.0700E-06 -4.5531E-07 S3 1.8234E-05 -9.8427E-06 -6.4330E-06 -7.2320E-06 1.5955E-06 -3.1614E-07 5.4250E-07 S4 -4.0149E-06 1.3327E-06 -4.6925E-07 3.8886E-06 7.3559E-07 1.2701E-06 -9.0840E-07 S5 -4.2639E-05 -2.6805E-05 -1.2977E-05 -8.0574E-06 -4.5558E-06 -3.6024E-06 2.0726E-06 S6 5.2862E-05 -5.4653E-05 -7.0510E-05 -3.9805E-05 -1.6725E-05 -2.3531E-06 1.8764E-06 S7 1.5389E-04 6.2127E-05 -4.0262E-05 -1.9331E-05 -5.5653E-06 3.0082E-06 -3.7580E-07 S8 -1.0768E-03 9.5607E-04 -2.1024E-04 -2.1558E-04 5.4756E-05 1.0164E-04 1.0893E-05 S9 4.3367E-03 4.9886E-04 -3.0501E-03 9.8023E-05 7.6234E-04 -7.3990E-05 -7.5733E-05 S10 -3.5916E-03 -2.1397E-04 -2.0901E-03 -5.0415E-04 -3.8172E-04 -1.4311E-04 2.9530E-04 S11 8.5903E-03 -3.2989E-03 -8.3743E-04 7.9588E-04 7.5908E-04 -9.8186E-04 2.8395E-04 S12 1.1280E-02 -6.6326E-03 6.8649E-03 -7.4078E-04 1.9282E-05 -1.5689E-03 6.5610E-04

[0088] Table 2

[0089] Figure 5A The on-axis chromatic aberration curves of the optical imaging systems 110, 120 and 130 of the first embodiment are shown, which represent the deflection of the focal point after light of different wavelengths passes through the optical imaging systems 110, 120 and 130. Figure 5B Astigmatism curves of the optical imaging systems 110, 120, and 130 of the first embodiment are shown, representing the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 5C The distortion curves of the optical imaging systems 110, 120 and 130 of the first embodiment are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of the optical imaging systems 110, 120, and 130 of the first embodiment are shown, representing the deviations in image height at different points on the imaging plane after light passes through the system. According to... Figures 5A to 5D It can be seen that the optical imaging systems 110, 120 and 130 given in the first embodiment can achieve good imaging quality.

[0090] Second embodiment

[0091] The following is for reference Figures 6 to 9D An optical imaging system according to a second embodiment of this application is described. Figure 6 A schematic diagram of the structure of an optical imaging system 210 according to Embodiment 1 of the second embodiment of this application is shown; Figure 7 A schematic diagram of the structure of an optical imaging system 220 according to Embodiment 2 of the second embodiment of this application is shown; Figure 8 A schematic diagram of the structure of an optical imaging system 230 according to Embodiment 3 of the second embodiment of this application is shown.

[0092] like Figures 6 to 8 As shown, optical imaging systems 210, 220, and 230 all include a lens barrel and a six-element lens group and a spacer group placed inside the lens barrel. The six-element lens group, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth spacer P6. The spacers can block excess light from entering the next lens during the imaging process, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging system.

[0093] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has negative optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter has an object-side surface S13 (not shown) and an image-side surface S14 (not shown). Light from the object passes sequentially through each surface S1 to S14 and is finally imaged onto the imaging surface S15 (not shown).

[0094] Table 3 shows the basic parameters of the optical imaging system of the second embodiment, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0095]

[0096] Table 3

[0097] In this embodiment, the total effective focal length f of the optical imaging system is 5.3199 mm, and the aperture number Fno of the optical imaging system is 1.9470.

[0098] In the second embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the sixth lens E6 are aspherical. Table 4 shows the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror S1-S12 in the second embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0099]

[0100]

[0101] Table 4

[0102] Figure 9A The on-axis chromatic aberration curves of the optical imaging systems 210, 220 and 230 of the second embodiment are shown, which represent the deflection of the focal point after light of different wavelengths passes through the optical imaging systems 210, 220 and 230. Figure 9BAstigmatism curves of optical imaging systems 210, 220, and 230 according to the second embodiment are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 9C The distortion curves of the optical imaging systems 210, 220 and 230 of the second embodiment are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 9D The magnification chromatic aberration curves of the optical imaging systems 210, 220, and 230 of the second embodiment are shown, representing the deviations in image height at different points on the imaging plane after light passes through the system. According to Figures 9A to 9D It can be seen that the optical imaging systems 210, 220 and 230 given in the second embodiment can achieve good imaging quality.

[0103] Third embodiment

[0104] The following is for reference Figures 10 to 13D This application describes an optical imaging system according to a third embodiment. Figure 10 A schematic diagram of the structure of an optical imaging system 310 according to Embodiment 1 of the third embodiment of this application is shown; Figure 11 A schematic diagram of the structure of an optical imaging system 320 according to Embodiment 2 of the third embodiment of this application is shown; Figure 12 A schematic diagram of the structure of an optical imaging system 330 according to Embodiment 3 of the third embodiment of this application is shown.

[0105] like Figures 10 to 12 As shown, optical imaging systems 310, 320, and 330 all include a lens barrel and a six-element lens group and a spacer group placed inside the lens barrel. The six-element lens group, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. An aperture stop STO can be disposed between the object side and the first lens E1. The spacer group includes: a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fourth auxiliary spacer P4b, a fifth spacer P5, a fifth auxiliary spacer P5b, and a sixth spacer P6. The spacers can block excess light from entering the next lens during the imaging process, while also allowing the lens to better contact the lens barrel, thus enhancing the structural stability of the optical imaging system.

[0106] The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter has an object-side surface S13 (not shown) and an image-side surface S14 (not shown). Light from the object passes sequentially through each surface S1 to S14 and is finally imaged onto the imaging surface S15 (not shown).

[0107] Table 5 shows the basic parameters of the optical imaging system of the third embodiment, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0108]

[0109] Table 5

[0110] In this embodiment, the total effective focal length f of the optical imaging system is 5.6594 mm, and the aperture number Fno of the optical imaging system is 1.9558.

[0111] In the third embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the sixth lens E6 are aspherical. Table 6 gives the higher-order coefficients A4, A6, A8, and A6 of each aspherical mirror S1-S12 that can be used in the third embodiment. 10 A 12 A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0112]

[0113]

[0114] Table 6

[0115] Figure 13A The on-axis chromatic aberration curves of the optical imaging systems 310, 320 and 330 of the third embodiment are shown, which represent the deflection of the focal point after light of different wavelengths passes through the optical imaging systems 310, 320 and 330. Figure 13BAstigmatism curves of optical imaging systems 310, 320, and 330 according to the third embodiment are shown, representing the meridional and sagittal image plane curvatures corresponding to different image heights. Figure 13C The distortion curves of the optical imaging systems 310, 320 and 330 of the third embodiment are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 13D The magnification chromatic aberration curves of the optical imaging systems 310, 320, and 330 of the third embodiment are shown, representing the deviations in image height at different points on the imaging plane after light passes through the system. According to Figures 13A to 13D It can be seen that the optical imaging systems 310, 320 and 330 given in the third embodiment can achieve good imaging quality.

[0116] Table 7 lists some basic parameters of the lens barrel and spacer in each embodiment from the first to the third embodiment, such as d1s, d1m, D1s, d2s, d2m, D2m, d3m, D3m, d4s, D4m, d5s, d5m, D5s, D5m, d6s, D6s, d0s, d0m, D0s, D0m, EP01, EP12, EP23, EP34, CP4, CP5, EP56, L, CP4b, d5bs, and D5bm. The basic parameters listed in Table 7 are based on... Figure 1 The measurements were obtained using the annotation method shown, and the units of the basic parameters listed in Table 7 are all millimeters (mm).

[0117]

[0118]

[0119] Table 7 summarizes the above, and Table 8 shows the values ​​of the conditional expressions for each embodiment in the first to third embodiments.

[0120] Conditional expression / embodiment 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 f6 x (D5m + d5m) / T56 -97.20 -96.80 -97.59 -90.59 -90.42 -89.88 -111.57 -110.12 -110.14 f5 x (D5s - d5s) / CP5 26.78 20.70 15.90 17.12 16.29 15.34 22.65 16.30 21.73 (R12 - R11) / (D0m - d0m) -15.59 -13.28 -16.95 -25.21 -25.21 -30.21 -27.22 -40.75 -41.50 (D0s + d0s) / f x Fno 4.36 4.21 4.01 4.55 4.54 4.31 4.22 4.12 3.98 (R8 - R9) x (D4m - d4s) / T45 21.92 22.83 22.21 10.01 10.46 11.02 13.50 13.16 13.35 R10 / (CP4 + T45 + CP4b) 13.72 13.96 13.88 34.25 32.31 32.31 10.11 9.73 9.64 R7 / (N3 + N4) x EP34 2.24 2.23 2.17 1.40 1.28 1.09 1.50 1.38 1.36 | f3 - f4 | / (D3m - d3m) 24.12 24.19 22.64 38.14 36.97 35.80 16.79 21.77 19.79 (V3 + V2) x EP23 / f2 -4.15 -3.87 -3.90 -4.33 -4.61 -4.99 -4.71 -4.71 -4.89 R4 x (D2m + d2m) / T23 41.87 41.31 39.46 50.63 49.82 47.39 58.98 67.08 69.59 R3 x (d2s - dlm) / EP12 -3.78 -4.92 -7.14 -2.63 -4.30 -7.46 -0.10 -7.09 -4.76 L x f1 / EP01 34.47 31.81 35.35 31.42 30.46 33.51 40.40 36.03 33.39 (R2 x D1s) / (R1 x d1s) 8.60 8.48 8.64 9.41 9.37 9.40 12.19 10.31 10.59 f6 / (D6s - d6s) -5.95 -5.95 -7.98 -5.41 -6.49 -5.72 -5.20 -6.23 -5.65 (d5bs x R9 + D5bm x R12) / EP56 77.65 75.46 76.70 81.63 80.53 81.69 83.97 81.73 78.68

[0121] Table 8

[0122] 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 imaging system described above.

[0123] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical imaging system, characterized in that, include: A six-element lens group includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens, a fifth lens with positive optical power, and a sixth lens with negative optical power, arranged sequentially along the optical axis from the object side to the image side. The object-side surfaces of the first lens, the second lens, the fourth lens, the fifth lens, and the sixth lens are all convex, and the image-side surfaces of the first lens, the second lens, the fourth lens, the fifth lens, and the sixth lens are all concave. A spacer assembly includes a second spacer disposed on and in contact with the image-side surface of the second lens, a third spacer disposed on and in contact with the image-side surface of the third lens, and a fifth spacer disposed on and in contact with the image-side surface of the fifth lens; and The lens barrel, the six-element lens group, and the spacer group are placed inside the lens barrel. The optical imaging system has six lenses with optical power. The effective focal length f6 of the sixth lens, the air gap T56 between the fifth and sixth lenses on the optical axis, the inner diameter d5m of the image side of the fifth spacer and the outer diameter D5m of the image side of the fifth spacer satisfy: -111.57mm≤f6×(D5m+d5m) / T56≤-89.88mm; The radius of curvature R11 of the object side of the sixth lens, the radius of curvature R12 of the image side of the sixth lens, the inner diameter d0m of the image side end face of the lens barrel, and the outer diameter D0m of the image side end face of the lens barrel satisfy: -41.50≤(R12-R11) / (D0m-d0m)≤-13.28; Wherein, the effective focal length f2 of the second lens, the Abbe number V2 of the second lens, the Abbe number V3 of the third lens, and the spacing EP23 of the second spacer and the third spacer in the direction parallel to the optical axis satisfy: -5<(V3+V2)×EP23 / f2≤-3.

87.

2. The optical imaging system according to claim 1, characterized in that, The effective focal length f5 of the fifth lens, the inner diameter d5s of the object side of the fifth spacer, the outer diameter D5s of the object side of the fifth spacer, and the maximum thickness CP5 of the fifth spacer satisfy the following: 15.34mm≤f5×(D5s-d5s) / CP5≤26.78mm.

3. The optical imaging system according to claim 1, characterized in that, The inner diameter d0s of the object-side end face of the lens barrel, the outer diameter D0s of the object-side end face of the lens barrel, the total effective focal length f of the optical imaging system and the aperture number Fno of the optical imaging system satisfy: 3.98≤(D0s+d0s) / f×Fno≤4.

55.

4. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a fourth spacer disposed on and in contact with the image-side surface of the fourth lens. The radius of curvature R8 of the image side of the fourth lens, the radius of curvature R9 of the object side of the fifth lens, the air gap T45 between the fourth and fifth lenses on the optical axis, the inner diameter d4s of the object side of the fourth spacer and the outer diameter D4m of the image side of the fourth spacer satisfy the following: 10mm < (R8-R9)×(D4m-d4s) / T45≤22.83mm.

5. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a fourth spacer disposed on and in contact with the image-side surface of the fourth lens, and a fourth auxiliary spacer disposed on and in contact with the image-side surface of the fourth spacer. Wherein, the radius of curvature R10 of the image side of the fifth lens, the air gap T45 between the fourth and fifth lenses on the optical axis, the maximum thickness CP4 of the fourth spacer and the maximum thickness CP4b of the fourth auxiliary spacer satisfy: 9.64≤R10 / (CP4+T45+CP4b)≤34.

25.

6. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a fourth spacer disposed on and in contact with the image-side surface of the fourth lens. Wherein, the refractive index N3 of the third lens, the refractive index N4 of the fourth lens, the radius of curvature R7 of the object side surface of the fourth lens, and the spacing EP34 between the third spacer and the fourth spacer in the direction parallel to the optical axis satisfy: 1.09≤R7 / (N3+N4)×EP34≤2.

24.

7. The optical imaging system according to any one of claims 1-3, characterized in that, The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the inner diameter d3m of the image side of the third spacer, and the outer diameter D3m of the image side of the third spacer satisfy: 16.79≤|f3-f4| / (D3m-d3m)≤38.

14.

8. The optical imaging system according to any one of claims 1-3, characterized in that, The radius of curvature R4 of the image side of the second lens, the air gap T23 between the second lens and the third lens on the optical axis, the inner diameter d2m of the image side of the second spacer and the outer diameter D2m of the image side of the second spacer satisfy: 39.46mm≤R4×(D2m+d2m) / T23≤69.59mm.

9. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a first spacer disposed on and in contact with the image-side surface of the first lens. Wherein, the radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first spacer, the inner diameter d2s of the object side of the second spacer, and the spacing EP12 between the first spacer and the second spacer in the direction parallel to the optical axis satisfy: -7.46mm≤R3×(d2s-d1m) / EP12≤-0.10mm.

10. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a first spacer disposed on and in contact with the image-side surface of the first lens. Wherein, the effective focal length f1 of the first lens, the length L of the lens barrel in the direction of the optical axis, and the distance EP01 between the object-side end face of the lens barrel and the first spacer in the direction parallel to the optical axis satisfy: 30.46mm≤L×f1 / EP01≤40.40mm.

11. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a first spacer disposed on and in contact with the image-side surface of the first lens. Wherein, 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 inner diameter d1s of the object side of the first spacer and the outer diameter D1s of the object side of the first spacer satisfy: 8.48≤(R2×D1s) / (R1×d1s)≤12.

19.

12. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a sixth spacer disposed on and in contact with the image-side surface of the sixth lens. Wherein, the effective focal length f6 of the sixth lens, the inner diameter d6s of the object side of the sixth spacer and the outer diameter D6s of the object side of the sixth spacer satisfy: -8<f6 / (D6s-d6s)≤-5.

20.

13. The optical imaging system according to any one of claims 1-3, characterized in that, The spacer assembly further includes a fifth auxiliary spacer disposed on and in contact with the image-side surface of the fifth spacer, and a sixth spacer disposed on and in contact with the image-side surface of the sixth lens. The radius of curvature R9 of the object side of the fifth lens, the radius of curvature R12 of the image side of the sixth lens, the inner diameter d5bs of the object side of the fifth auxiliary spacer, the outer diameter D5bm of the image side of the fifth auxiliary spacer, and the spacing EP56 between the fifth and sixth spacers in the direction parallel to the optical axis satisfy: 75.46mm≤(d5bs×R9+D5bm×R12) / EP56≤83.97mm.

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