Optical imaging system

Abstract

The application discloses an optical imaging system, which comprises a lens barrel, a lens set and a plurality of isolators arranged in the lens barrel, wherein the lens set comprises, in sequence from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the plurality of isolators comprises a third isolator, a fourth isolator and a sixth isolator; the central thickness of the fourth lens among the first lens to the seventh lens on the optical axis is the largest; at least one lens among the third lens and the fourth lens has positive focal power; the effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth isolator along the optical axis direction, the effective focal length f3 of the third lens and the maximum thickness CP3 of the third isolator along the optical axis direction satisfy: 8.5<|f4 / CP4+CP3 / f3|<30.0; the inner diameter d6s of the object side surface of the sixth isolator, the inner diameter d6m of the image side surface of the sixth isolator, the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: 5.0<(d6m+d6s) / (R12‑R13)<9.0.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical elements, in particular to an optical imaging system. BACKGROUND

[0002] With the rapid development of smart phones, the thickness of the phone is becoming thinner and thinner. This also limits the length of the phone lens, so that the phone lens needs to be limited in a small space. However, the length of the lens is one of the important factors that limit the imaging quality of the lens. In order to meet the requirements of customers, the overall design will make the thickness of the lens and the air gap too thin, but it will increase the instability of processing and assembly, and also cause the transition of light to be not smooth, various aberrations to increase, and the resolving power of the lens to decrease.

[0003] In order to overcome the limitation of the thickness of the phone, the telescopic imaging lens has become one of the hotspots of current research. The telescopic imaging lens can realize the telescopic function of the lens in the space limited by the thickness of the smart phone, that is, in the working state, the lens is in the extended state, at this time the whole optical system has a relatively long length, and the light can be smoothly hit on the image plane, so that the lens has a relatively high resolving power, while in the non-working state, the lens is in the retracted state, and the lens will not protrude from the surface of the back shell of the phone. However, the telescopic imaging lens generally has the problems of large rear lens gap and poor assembly stability, and the front lens of the telescopic imaging lens is highly sensitive, and the unreasonable distribution of the thickness of each lens and the spacer can easily cause the phenomenon of internal reflection stray light. SUMMARY

[0004] The present application provides such an optical imaging system, which comprises a lens barrel and a lens group and a plurality of spacers arranged in the lens barrel, wherein the lens group comprises, in sequence from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the plurality of spacers comprises a third spacer arranged on the image side of the third lens and partially in contact with the image side surface of the third lens, a fourth spacer arranged on the image side of the fourth lens and partially in contact with the image side surface of the fourth lens, and a sixth spacer arranged on the image side of the sixth lens and partially in contact with the image side surface of the sixth lens; among the first lens to the seventh lens, the central thickness of the fourth lens on the optical axis is the largest; at least one of the third lens and the fourth lens has positive refractive power; the effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth spacer along the optical axis, the effective focal length f3 of the third lens and the maximum thickness CP3 of the third spacer along the optical axis satisfy: 8.5<|f4 / CP4+CP3 / f3|<30.0; and the inner diameter d6s of the object side surface of the sixth spacer, the inner diameter d6m of the image side surface of the sixth spacer, the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: 5.0<(d6m+d6s) / (R12-R13)<9.0.

[0005] In one embodiment, the signs of the radii of curvature of the object side surface and the image side surface of the sixth lens are different, the signs of the radii of curvature of the object side surface and the image side surface of the seventh lens are different, and 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 radius of curvature R13 of the object side surface of the seventh lens, the radius of curvature R14 of the image side surface of the seventh lens, and the maximum thickness CP6 of the sixth spacer along the optical axis direction satisfy: -3.0 < (R11 / R12 + R13 / R14) x CP6 < 0.

[0006] In one embodiment, the distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis direction, the central thickness CT3 of the third lens on the optical axis, the maximum thickness CP4 of the fourth spacer along the optical axis direction, and the air gap T45 of the fourth lens and the fifth lens on the optical axis satisfy: 1.5 < EP34 / CT3 + CP4 / T45 < 5.5.

[0007] In one embodiment, the effective focal length f4 of the fourth lens and the distance EP34 from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis direction satisfy: 11.0 < |f4 / EP34| < 21.0.

[0008] In one embodiment, the radius of curvature R8 of the image side surface of the fourth lens and the maximum thickness CP4 of the fourth spacer along the optical axis direction satisfy: -40.5 < R8 / CP4 < -4.0.

[0009] In one embodiment, the maximum thickness CP4 of the fourth spacer along the optical axis direction and the central thickness CT4 of the fourth lens on the optical axis satisfy: CP4 / CT4 < 1.0.

[0010] In one embodiment, the plurality of spacers further comprises: a fifth spacer disposed on the image side of the fifth lens and partially in contact with the image side surface of the fifth lens; wherein the effective focal length f6 of the sixth lens, the distance EP56 from the image side surface of the fifth spacer to the object side surface of the sixth spacer along the optical axis direction, and the maximum thickness CP6 of the sixth spacer along the optical axis direction satisfy: 2.0 < f6 / (EP56+CP6) < 6.2.

[0011] In one embodiment, the plurality of spacers further comprises: a fifth spacer disposed on the image side of the fifth lens and partially in contact with the image side surface of the fifth lens; wherein the outer diameter D5s of the object side surface of the fifth spacer, the outer diameter D5m of the image side surface of the fifth spacer, the radius of curvature R10 of the image side surface of the fifth lens, and the radius of curvature R11 of the object side surface of the sixth lens satisfy: 0.5 < D5s / R10 + D5m / R11 < 6.5.

[0012] In one embodiment, the effective focal length f of the optical imaging system, the maximum half field angle Semi-FOV of the optical imaging system, the outer diameter D0m of the image-side end surface of the lens barrel, and the outer diameter D0s of the object-side end surface of the lens barrel satisfy: 9.5 < f / tan(Semi-FOV) + D0m / D0s < 12.5.

[0013] In one embodiment, the plurality of spacers further comprises: a second spacer disposed on the image side of the second lens and partially 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 radius of curvature R5 of the object-side surface of the third lens, the separation distance EP23 of the image-side surface of the second spacer to the object-side surface of the third spacer along the optical axis direction, and the maximum thickness CP2 of the second spacer along the optical axis direction satisfy: 19.0 < R4 / R5 + EP23 / CP2 < 57.0.

[0014] In one embodiment, the effective focal length f of the optical imaging system, the maximum half field angle Semi-FOV of the optical imaging system, and the maximum height L of the lens barrel along the optical axis direction satisfy: f / L x tan(Semi-FOV) < 1.0.

[0015] In one embodiment, the plurality of spacers further comprises: a first spacer disposed on the image side of the first lens and partially in contact with the image-side surface of the first lens; wherein the outer diameter D1s of the object-side surface of the first spacer, the distance EP01 of the object-side end surface of the lens barrel to the object-side surface of the first spacer along the optical axis direction, the maximum height L of the lens barrel along the optical axis direction, and the distance TD of the object-side surface of the first lens to the image-side surface of the seventh lens along the optical axis satisfy: 5.0 < D1s / EP01 + L / TD < 9.5.

[0016] In one embodiment, the plurality of spacers further comprises: a second spacer disposed on the image side of the second lens and partially in contact with the image-side surface of the second lens; wherein the distance TD of the object-side surface of the first lens to the image-side surface of the seventh lens along the optical axis, the separation distance EP23 of the image-side surface of the second spacer to the object-side surface of the third spacer along the optical axis direction, and the distance EP34 of the image-side surface of the third spacer to the object-side surface of the fourth spacer along the optical axis direction satisfy: 3.5 < TD / (EP23 + EP34) < 6.5.

[0017] The application provides a seven-piece optical imaging system, which adjusts the thickness of part of lenses and the distribution of spacers, ensures the processing and structural stability of the lens, and reduces the influence of stray light on imaging. The optical imaging system provided by the application meets the conditions of 8.5<|f4 / CP4+CP3 / f3|<30.0 and 5.0<(d6m+d6s) / (R12-R13)<9.0 on the basis of thickening the central thickness of the fourth lens, adjusts the effective focal length of the fourth lens and the third lens to constrain the thickness of the third spacer and the fourth spacer, effectively adjusts the interval between the related lenses, adjusts the inner diameter of the object side of the sixth spacer and the inner diameter of the image side of the sixth spacer by adjusting the curvature radius of the sixth lens and the seventh lens, ensures the stability of lens forming, reduces the sensitivity of the front end lens and the assembly stability of the rear end lens as a whole, and effectively improves the stability performance of the lens group in the reliability experiment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Other features, objects, and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the drawings:

[0019] Figure 1 The structural arrangement diagram and the schematic diagram of part of parameters of an optical imaging system according to the application are shown;

[0020] Figure 2A and Figure 2B The structural schematic diagram of an optical imaging system according to the embodiment 1 of the application is shown;

[0021] Figures 3A to 3C The on-axis chromatic aberration curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging system according to the embodiment 1 of the application are respectively shown;

[0022] Figure 4A and Figure 4B The structural schematic diagram of an optical imaging system according to the embodiment 2 of the application is shown;

[0023] Figures 5A to 5C The on-axis chromatic aberration curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging system according to the embodiment 2 of the application are respectively shown;

[0024] Figure 6A and Figure 6B The structural schematic diagram of an optical imaging system according to the embodiment 3 of the application is shown;

[0025] Figures 7A to 7C The on-axis chromatic aberration curve, the distortion curve and the magnification chromatic aberration curve of the optical imaging system according to the embodiment 3 of the application are respectively shown;

[0026] Figure 8A andFigure 8B A structural diagram of an optical imaging system according to Embodiment 4 of the present application is shown; and

[0027] Figures 9A to 9C An on-axis chromatic aberration curve, a distortion curve, and a magnification chromatic aberration curve of the optical imaging system according to Embodiment 4 of the present application are shown, respectively. DETAILED DESCRIPTION

[0028] For a better understanding of the present application, various aspects of the present application will be described in greater detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are merely descriptive of exemplary embodiments of the present application, and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] It should be noted that, in the present specification, the expressions first, second, third, and the like are merely used to distinguish one feature from another feature, and do not represent any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0030] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0031] In the present specification, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens that is closer to the object is referred to as the object side surface of the lens, and the surface of each lens that is closer to the imaging plane is referred to as the image side surface of the lens.

[0032] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "may" means one or more embodiments of the present application. Also, the expression "exemplary" is intended to mean an example or an illustration.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0034] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The following embodiments only express several embodiments of the present application, which are described in detail and specifically, but should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application, for example, the lens group, the lens barrel and the isolation piece in each embodiment of the present application can be combined arbitrarily, which is not limited to that the lens group in one embodiment can only be combined with the lens barrel, the isolation piece and the like of the embodiment.

[0035] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Figure 1 The structural arrangement diagram of an optical imaging system according to the present application and the schematic diagram of part of the parameters are shown. Those skilled in the art should understand that some parameters of lenses often used in the art, such as the central thickness CT3 of the third lens on the optical axis, are not shown in the drawings, Figure 1 Figure 1 Only part of the parameters of the lens barrel and the isolation piece of an optical imaging system of the present application are shown exemplarily, so as to better understand the present application. As Figure 1 ​As shown, EP34 represents the interval distance of the image-side surface of the third spacer and the object-side surface of the fourth spacer in the direction of the optical axis, CP1 represents the maximum thickness of the first spacer in the direction of the optical axis, CP3 represents the maximum thickness of the third spacer in the direction of the optical axis, CP4 represents the maximum thickness of the fourth spacer in the direction of the optical axis, CP6 represents the maximum thickness of the sixth spacer in the direction of the optical axis, D0s represents the outer diameter of the object-side end surface of the lens barrel, d0s represents the inner diameter of the object-side end surface of the lens barrel, D3s represents the outer diameter of the object-side surface of the third spacer, D3m represents the outer diameter of the image-side surface of the third spacer, D1s represents the outer diameter of the object-side surface of the first spacer, D1m represents the outer diameter of the image-side surface of the first spacer, d3s represents the inner diameter of the object-side surface of the third spacer, d3m represents the inner diameter of the image-side surface of the third spacer, d1s represents the inner diameter of the object-side surface of the first spacer, d1m represents the inner diameter of the image-side surface of the first spacer, d4s represents the inner diameter of the object-side surface of the fourth spacer, d4m represents the inner diameter of the image-side surface of the fourth spacer, D4s represents the outer diameter of the object-side surface of the fourth spacer, D4m represents the outer diameter of the image-side surface of the fourth spacer, d6s represents the inner diameter of the object-side surface of the sixth spacer, d6m represents the inner diameter of the image-side surface of the sixth spacer, D6s represents the outer diameter of the object-side surface of the sixth spacer, D6m represents the outer diameter of the image-side surface of the sixth spacer, d0m represents the inner diameter of the image-side end surface of the lens barrel, D0m represents the outer diameter of the image-side end surface of the lens barrel.

[0036] The optical imaging system according to the exemplary embodiments of the present application includes a lens barrel, and a lens group and a plurality of spacers disposed in the lens barrel. The lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0037] In the exemplary embodiments, the plurality of spacers can include a third spacer, a fourth spacer, and a sixth spacer. The third spacer is disposed on the image side of the third lens and partially contacts the image-side surface of the third lens, the fourth spacer is disposed on the image side of the fourth lens and partially contacts the image-side surface of the fourth lens, and the sixth spacer is disposed on the image side of the sixth lens and partially contacts the image-side surface of the sixth lens.

[0038] In the exemplary embodiments, among the first lens to the seventh lens, the fourth lens has the largest central thickness on the optical axis.

[0039] In the exemplary embodiments, at least one of the third lens and the fourth lens has a positive refractive power.

[0040] In an example embodiment, the optical imaging system according to the present application can satisfy: 8.5<|f4 / CP4+CP3 / f3|<30.0, where f4 is the effective focal length of the fourth lens, CP4 is the maximum thickness of the fourth spacer along the optical axis, f3 is the effective focal length of the third lens, and CP3 is the maximum thickness of the third spacer along the optical axis.

[0041] In an example embodiment, the optical imaging system according to the present application can satisfy: 5.0<(d6m+d6s) / (R12-R13)<9.0, where d6s is the inner diameter of the object side surface of the sixth spacer, d6m is the inner diameter of the image side surface of the sixth spacer, R12 is the radius of curvature of the image side surface of the sixth lens, and R13 is the radius of curvature of the object side surface of the seventh lens.

[0042] The optical imaging system according to the example embodiments of the present application includes a lens barrel, a lens group disposed in the lens barrel, and a plurality of spacers disposed in the lens barrel. The lens group includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The plurality of spacers includes a third spacer, a fourth spacer, and a sixth spacer. The third spacer is disposed on the image side of the third lens and partially contacts the image side surface of the third lens; the fourth spacer is disposed on the image side of the fourth lens and partially contacts the image side surface of the fourth lens; and the sixth spacer is disposed on the image side of the sixth lens and partially contacts the image side surface of the sixth lens. Among the first lens to the seventh lens, the fourth lens has the largest central thickness on the optical axis; and at least one of the third lens and the fourth lens has a positive focal length. The effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth spacer along the optical axis, the effective focal length f3 of the third lens, the maximum thickness CP3 of the third spacer along the optical axis, the inner diameter d6s of the object side surface of the sixth spacer, the inner diameter d6m of the image side surface of the sixth spacer, the radius of curvature R12 of the image side surface of the sixth lens, and the radius of curvature R13 of the object side surface of the seventh lens satisfy: 8.5<|f4 / CP4+CP3 / f3|<30.0 and 5.0<(d6m+d6s) / (R12-R13)<9.0. Satisfying the above conditions can help to ensure good resolution of the lens in a limited space. Thickening the central thickness of the fourth lens and adjusting the effective focal lengths of the fourth lens and the third lens can effectively adjust the spacing between the relevant lenses. Adjusting the radii of curvature of the sixth lens and the seventh lens can effectively adjust the inner diameter of the object side surface and the inner diameter of the image side surface of the sixth spacer, thereby ensuring the stability of lens molding, reducing the sensitivity of the front end lens and the assembly stability of the rear end lens, and effectively improving the stability performance of the lens group in the reliability experiment.

[0043] In the example embodiment, the plurality of isolators of the optical imaging system further comprises a first isolator, a second isolator and a fifth isolator, the first isolator is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second isolator is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; and the fifth isolator is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. The internal stray light phenomenon of the first lens and the second lens is obvious and the end-to-end lens segment difference is large. By reasonably arranging the first isolator and the second isolator, the stray light can be effectively shielded, and the influence on imaging is reduced. At the same time, by arranging the fifth isolator, the assembly stability of the front and rear lenses can be effectively improved, and the overall lens has good resolving power.

[0044] In the example embodiment, the plurality of isolators of the optical imaging system can include at least one of a first isolator, a second isolator, a third isolator, a fourth isolator, a fifth isolator and a sixth isolator. The first isolator is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens. The second isolator is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens. The third isolator is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens. The fourth isolator is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens. The fifth isolator is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. The sixth isolator is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. It should be understood that the number of isolators is not specifically limited in the present application, and any number of isolators can be included between any two lenses, and the entire optical imaging system can also include any number of isolators. The isolator helps the optical imaging system to intercept excess catadioptric light paths, reduce stray light and ghosting. The isolator and the lens barrel increase the auxiliary bearing, which is beneficial to improve the poor assembly stability and low performance yield caused by large segment difference between lenses.

[0045] In the example embodiment, the signs of the radii of curvature of the object side surface and the image side surface of the sixth lens are different, the signs of the radii of curvature of the object side surface and the image side surface of the seventh lens are different, and the optical imaging system according to the present application can satisfy: -3.0 < (R11 / R12+R13 / R14) x CP6 < 0, where R11 is the radius of curvature of the object side surface of the sixth lens, R12 is the radius of curvature of the image side surface of the sixth lens, R13 is the radius of curvature of the object side surface of the seventh lens, R14 is the radius of curvature of the image side surface of the seventh lens, and CP6 is the maximum thickness of the sixth spacer along the optical axis direction. Satisfying -3.0 < (R11 / R12+R13 / R14) x CP6 < 0, by adjusting the front and back radii of curvature of the sixth lens and the seventh lens, the light can be effectively smoothed through the optical imaging system, and better resolution is presented. At the same time, by the relationship, the maximum thickness of the sixth spacer can be constrained, the lens edge thickness of the sixth lens and the seventh lens can be effectively ensured, and by combining the control of the front and back radii of curvature of the sixth lens and the seventh lens, the lens forming can be ensured, and the limit process can be avoided.

[0046] In the example embodiment, the optical imaging system according to the present application can satisfy: 1.5 < EP34 / CT3+CP4 / T45 < 5.5, where EP34 is the distance from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis direction, CT3 is the center thickness of the third lens on the optical axis, CP4 is the maximum thickness of the fourth spacer along the optical axis direction, and T45 is the air gap of the fourth lens and the fifth lens on the optical axis. Satisfying 1.5 < EP34 / CT3+CP4 / T45 < 5.5, by reasonably setting the center thickness of the third lens and the air gap of the fourth lens and the fifth lens on the optical axis, the imaging quality of the optical imaging system in the limited lens length space can be improved. At the same time, by the relationship, the distance from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis direction and the maximum thickness of the fourth spacer along the optical axis can be constrained, the structural stability at the position with large difference perpendicular to the optical axis direction can be effectively improved, and the change amount in high temperature and high humidity reliability test can be reduced.

[0047] In the example embodiment, the optical imaging system according to the present application can satisfy: 11.0 < |f4 / EP34| < 21.0, where f4 is the effective focal length of the fourth lens, and EP34 is the distance from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis direction. Satisfying 11.0 < |f4 / EP34| < 21.0, by reasonably setting the effective focal length of the fourth lens, the sensitivity of the system can be effectively reduced, and by constraining the distance from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis direction, the assembly stability can be effectively increased.

[0048] In the example embodiment, the optical imaging system according to the present application can satisfy: -40.5 < R8 / CP4 < -4.0, where R8 is the radius of curvature of the image side surface of the fourth lens, and CP4 is the maximum thickness of the fourth spacer along the optical axis. Satisfying -40.5 < R8 / CP4 < -4.0, the maximum thickness of the fourth spacer is constrained by the radius of curvature of the image side surface of the fourth lens, which ensures the stability of the effective diameter of the fourth lens while controlling the stray light generated by the reflection of the ineffective light on the inner diameter surface of the fourth spacer, thereby ensuring the imaging quality.

[0049] In the example embodiment, the optical imaging system according to the present application can satisfy: CP4 / CT4 < 1.0, where CP4 is the maximum thickness of the fourth spacer along the optical axis, and CT4 is the center thickness of the fourth lens along the optical axis. Satisfying CP4 / CT4 < 1.0, the maximum thickness of the fourth spacer is constrained by the center thickness of the fourth lens, which can reduce the imaging impact of the stray light generated by the ineffective light in the fourth spacer while ensuring the structural strength.

[0050] In the example embodiment, the optical imaging system according to the present application can satisfy: 2.0 < f6 / (EP56+CP6) < 6.2, where f6 is the effective focal length of the sixth lens, EP56 is the interval distance from the image side surface of the fifth spacer to the object side surface of the sixth spacer along the optical axis, and CP6 is the maximum thickness of the sixth spacer along the optical axis. Satisfying 2.0 < f6 / (EP56+CP6) < 6.2, the overall strength of the sixth lens can be controlled by adjusting the effective focal length of the sixth lens, and the interval distance from the image side surface of the fifth spacer to the object side surface of the sixth spacer along the optical axis and the maximum thickness of the sixth spacer are constrained by the relationship, which can effectively ensure the assembly stability of the sixth lens and the seventh lens.

[0051] In the example embodiment, the optical imaging system according to the present application can satisfy: 0.5 < D5s / R10+D5m / R11 < 6.5, where D5s is the outer diameter of the object side surface of the fifth spacer, D5m is the outer diameter of the image side surface of the fifth spacer, R10 is the radius of curvature of the image side surface of the fifth lens, and R11 is the radius of curvature of the object side surface of the sixth lens. Satisfying 0.5 < D5s / R10+D5m / R11 < 6.5, the light can be effectively converged and the ghost generated by the internal reflection of the lens can be reduced by adjusting the radius of curvature of the image side surface of the fifth lens and the radius of curvature of the object side surface of the sixth lens, and the outer diameter of the object side surface and the outer diameter of the image side surface of the fifth spacer are controlled by the relationship, which can shield the stray light generated by the internal reflection of the fifth lens while ensuring the strength of the spacer.

[0052] In an example embodiment, the optical imaging system according to the present application can satisfy: 9.5 < f / tan(Semi-FOV) + D0m / D0s < 12.5, where f is an effective focal length of the optical imaging system, Semi-FOV is a maximum half field of view of the optical imaging system, D0m is an outer diameter of an image-side end surface of a lens barrel, and D0s is an outer diameter of an object-side end surface of the lens barrel. Satisfying 9.5 < f / tan(Semi-FOV) + D0m / D0s < 12.5 controls the effective focal length of the optical imaging system, which can effectively ensure the definition of imaging, and in combination with the maximum half field of view of the optical imaging system and the outer diameter of the object-side end surface of the lens barrel, the entry of effective light and the shielding of ineffective light can be ensured, and controlling the outer diameter of the image-side end surface of the lens barrel can reduce the reflection of ineffective light on the inner wall of the image-side of the lens barrel, reduce the risk of stray light, and improve the imaging quality.

[0053] In an example embodiment, the optical imaging system according to the present application can satisfy: 19.0 < R4 / R5 + EP23 / CP2 < 57.0, where R4 is a radius of curvature of an image-side surface of a second lens, R5 is a radius of curvature of an object-side surface of a third lens, EP23 is a separation distance along an optical axis direction from an image-side surface of a second spacer to an object-side surface of a third spacer, and CP2 is a maximum thickness of the second spacer along the optical axis direction. Satisfying 19.0 < R4 / R5 + EP23 / CP2 < 57.0 can adjust the separation distance along the optical axis direction from the image-side surface of the second spacer to the object-side surface of the third spacer, while the maximum thickness of the second spacer can be constrained to ensure the strength of the second spacer and reduce stray light caused by deformation of the spacer.

[0054] In an example embodiment, the optical imaging system according to the present application can satisfy: f / L x tan(Semi-FOV) < 1.0, where f is an effective focal length of the optical imaging system, Semi-FOV is a maximum half field of view of the optical imaging system, and L is a maximum height of a lens barrel along an optical axis direction. Satisfying f / L x tan(Semi-FOV) < 1.0 controls the effective focal length of the optical imaging system, which can effectively ensure the definition of imaging, and in combination with the maximum half field of view of the optical imaging system, the maximum height of the lens barrel can be constrained to ensure the length of the zoom lens while also ensuring the structural strength at the optical requirement length.

[0055] In an example embodiment, the optical imaging system according to the present application can satisfy: 5.0 < D1s / EP01+L / TD < 9.5, where D1s is the outer diameter of the object side surface of the first spacer, EP01 is the distance from the object side end surface of the lens barrel to the object side surface of the first spacer along the optical axis, L is the maximum height of the lens barrel along the optical axis, and TD is the distance from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis. Satisfying 5.0 < D1s / EP01+L / TD < 9.5 can ensure the assembly stability while constraining the maximum height of the lens barrel, and adjusting the outer diameter of the object side surface of the first spacer and the distance from the object side end surface of the lens barrel to the object side surface of the first spacer along the optical axis according to the above relationship can effectively ensure the front end thickness of the lens barrel and optimize the structural strength.

[0056] In an example embodiment, the optical imaging system according to the present application can satisfy: 3.5 < TD / (EP23+EP34) < 6.5, where TD is the distance from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis, EP23 is the interval distance from the image side surface of the second spacer to the object side surface of the third spacer along the optical axis, and EP34 is the distance from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis. The internal stray light of the second lens and the third lens of the lens group can easily affect the imaging quality, and satisfying 3.5 < TD / (EP23+EP34) < 6.5 can constrain the interval distance from the image side surface of the second spacer to the object side surface of the third spacer along the optical axis and the distance from the image side surface of the third spacer to the object side surface of the fourth spacer along the optical axis according to the distance from the object side surface of the first lens to the image side surface of the seventh lens on the optical axis, which can effectively adjust the internal stray light of the lenses and effectively improve the imaging quality.

[0057] In an example embodiment, the first lens can have positive refractive power, the second lens can have positive refractive power or negative refractive power, the third lens can have positive refractive power or negative refractive power, the fourth lens can have positive refractive power or negative refractive power, the fifth lens can have positive refractive power or negative refractive power, the sixth lens can have positive refractive power, and the seventh lens can have negative refractive power.

[0058] In an embodiment of the present application, at least one of the lens surfaces of each lens is a non-spherical lens surface, i.e., at least one of the lens surfaces from the object side surface of the first lens to the image side surface of the seventh lens is a non-spherical lens surface. The non-spherical lens has the characteristic that the curvature continuously changes from the center of the lens to the periphery of the lens. Unlike the spherical lens having constant curvature from the center of the lens to the periphery of the lens, the non-spherical lens has better curvature radius characteristics, has the advantages of improving the distortion aberration and improving the astigmatism aberration. After using the non-spherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Alternatively, the object side surface and the image side surface of all the lenses from the first lens to the seventh lens can be non-spherical lens surfaces.

[0059] In the exemplary embodiments, the optical imaging system described above can further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0060] The optical imaging system according to the above embodiments of the present application can employ multiple lenses, for example, seven lenses as described above. By reasonably allocating the optical power, surface shape of each lens, and arrangement of each spacer, etc., the span of each gear of the lens and the lens barrel is relatively uniform, the light converging ability is enhanced, and the imaging quality of the ultra-thin, large imaging surface optical imaging system is improved. However, those skilled in the art should understand that the number of lenses constituting the optical imaging system can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the specification. For example, although the seven lenses are described as an example in the embodiments, the optical imaging system is not limited to including seven lenses. If necessary, the optical imaging system can also include other numbers of lenses.

[0061] The specific embodiments of the optical imaging system applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0062] Example 1

[0063] The following refers to Figures 2A to 3C The optical imaging system 1001 and the optical imaging system 1002 according to Embodiment 1 of the present application are described below. Figure 2A and Figure 2B The structural schematic diagrams of the optical imaging system 1001 and the optical imaging system 1002 according to Embodiment 1 of the present application are shown in

[0064] As shown in Figure 2A and Figure 2B The optical imaging system 1001 and the optical imaging system 1002 each include a lens barrel P0, a lens group E1-E7, and a plurality of spacers P1-P6.

[0065] As shown in Figure 2A and Figure 2BAs shown, the optical imaging system 1001 and the optical imaging system 1002 employ the same lens set, which 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, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The seventh lens E7 has an object side surface S13 and an image side surface S14. A filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown), and light from an object sequentially passes through the surfaces S1 to S16 and is finally imaged on an imaging surface S17 (not shown).

[0066] Table 1 shows a basic parameter table of the lens set of the optical imaging system 1001 and the optical imaging system 1002 of Example 1, where the units of the radius of curvature, the thickness, and the effective focal length are all millimeters (mm).

[0067]

[0068]

[0069] Table 1

[0070] In the present example, the effective focal length f of the optical imaging system 1001 and the optical imaging system 1002 is 8.42 mm, the maximum half field angle Semi-FOV of the optical imaging system 1001 and the optical imaging system 1002 is 39.36°, and the F-number Fno of the optical imaging system 1001 and the optical imaging system 1002 is 1.88.

[0071] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces, and the surface shape x of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0072]

[0073] where x is the sag 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 inverse of the radius of curvature R in Table 1 above), k is the conic coefficient, and Ai is the correction coefficient of the i-th order of the aspherical surface. Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30, A32, A34, A36, A38, A40, A42, A44, A46, A48, A50, A52, A54, A56, A58, A60, A62, A64, A66, A68, A70, A72, A74, A76, A78, A80, A82, A84, A86, A88, A90, A92, A94, A96, A98, and A100 that can be used for each aspherical surface S1-S14 in Example 1. 10 12 ​A 14 A 16 A 18 A 20 A 22 A 24 A 26 A 28 and A 30 .

[0074]

[0075]

[0076] Table 2-1

[0077] Face No. A18 A20 A22 A24 A26 A28 A30 S1 -6.10E-05 -3.31E-05 1.08E-05 2.37E-05 1.33E-05 -1.40E-05 2.09E-06 S2 7.58E-05 -4.59E-05 6.41E-05 3.24E-05 5.31E-05 -1.07E-05 -1.43E-05 S3 -1.39E-06 -4.38E-05 8.94E-05 1.95E-07 4.53E-05 4.64E-06 5.49E-06 S4 -3.92E-04 -1.92E-04 -3.55E-05 3.54E-05 5.62E-05 3.26E-05 1.18E-05 S5 -9.81E-05 -7.20E-06 1.46E-05 1.13E-05 -1.71E-06 -5.58E-06 7.59E-07 S6 -3.36E-04 5.37E-05 1.46E-05 2.18E-05 -3.73E-06 2.91E-06 1.81E-06 S7 -7.17E-04 -9.62E-05 4.59E-05 2.66E-05 -2.77E-05 -3.90E-05 -2.32E-05 S8 -1.46E-04 1.25E-04 -1.75E-04 6.81E-06 -6.18E-05 -6.26E-06 -8.43E-06 S9 -4.79E-03 2.04E-03 -1.73E-03 9.94E-04 -7.27E-04 3.61E-04 -4.27E-04 S10 4.55E-04 1.09E-03 -8.78E-05 2.44E-05 -2.05E-04 1.00E-04 -1.46E-05 S11 7.59E-04 1.66E-03 1.60E-04 -3.82E-04 -1.71E-04 -2.57E-05 8.17E-05 S12 -4.21E-03 3.06E-03 -1.12E-03 2.21E-04 3.11E-04 -2.06E-04 1.12E-05 S13 -4.44E-03 -2.07E-03 2.35E-03 -7.96E-04 -2.61E-04 3.52E-04 -9.84E-05 S14 2.50E-03 -7.46E-04 -2.92E-04 -7.39E-04 4.13E-04 -6.32E-06 -1.68E-05

[0078] Table 2-2

[0079] like Figure 2A and Figure 2B As shown, both optical imaging systems 1001 and 1002 include six isolating elements. The first isolating element P1 is positioned on the image side of the first lens and at least partially contacts the image side of the first lens; the second isolating element P2 is positioned on the image side of the second lens and at least partially contacts the image side of the second lens; the third isolating element P3 is positioned on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth isolating element P4 is positioned on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; the fifth isolating element P5 is positioned on the image side of the fifth lens and at least partially contacts the image side of the fifth lens; and the sixth isolating element P6 is positioned on the image side of the sixth lens and at least partially contacts the image side of the sixth lens. These isolating elements can block excess external light from entering, allowing the lens and lens barrel to better support each other, and enhancing the structural stability of optical imaging systems 1001 and 1002.

[0080] Table 3 shows the basic parameters of the isolation components and lens barrels of the optical imaging system 1001 and optical imaging system 1002 of Embodiment 1. The unit of each parameter in Table 3 is millimeters (mm).

[0081]

[0082]

[0083] Table 3

[0084] Figure 3A The on-axis chromatic aberration curves of optical imaging systems 1001 and 1002 of Embodiment 1 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3BThe distortion curves of the optical imaging system 1001 and the optical imaging system 1002 of Embodiment 1 are shown, which represent the distortion size values corresponding to different image heights. Figure 3C The magnification chromatic aberration curves of the optical imaging system 1001 and the optical imaging system 1002 of Embodiment 1 are shown, which represent the deviations of light rays via the lens on the imaging surface at different image heights. According to the magnification chromatic aberration curves, the optical imaging system 1001 and the optical imaging system 1002 of Embodiment 1 have good imaging quality. Figures 3A to 3C It can be seen that the optical imaging system 1001 and the optical imaging system 1002 of Embodiment 1 can achieve good imaging quality.

[0085] Example 2

[0086] The following refers to Figures 4A to 5C The optical imaging system 2001 and the optical imaging system 2002 according to Embodiment 2 of the present application are described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 4A and Figure 4B The structural schematic diagrams of the optical imaging system 2001 and the optical imaging system 2002 according to Embodiment 2 of the present application are shown, respectively.

[0087] As shown in Figure 4A and Figure 4B The optical imaging system 2001 and the optical imaging system 2002 each include a lens barrel P0, a lens group E1-E7, and a plurality of spacers P1-P6, respectively.

[0088] As shown in Figure 4A and Figure 4B The optical imaging system 2001 and the optical imaging system 2002 use the same lens group, which 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, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The seventh lens E7 has an object side surface S13 and an image side surface S14. A filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown), and light from an object sequentially passes through the surfaces S1 to S16 and is finally imaged on an imaging surface S17 (not shown).

[0089] In the present example, the effective focal length f of the optical imaging system 2001 and the optical imaging system 2002 is 8.68 mm, the maximum half field angle Semi-FOV of the optical imaging system 2001 and the optical imaging system 2002 is 39.39°, and the F-number Fno of the optical imaging system 2001 and the optical imaging system 2002 is 1.88.

[0090] Table 4 shows the basic parameters of the lens groups of the optical imaging system 2001 and the optical imaging system 2002 of Example 2, wherein the units of the radius of curvature, the thickness and the effective focal length are millimeters (mm). Table 5-1 and Table 5-2 show the high-order term coefficients of the aspherical surfaces of the optical imaging system 2001 and the optical imaging system 2002 of Example 2, wherein each aspherical surface can be defined by the formula (1) given in Example 1.

[0091]

[0092] Table 4

[0093] Face No. A4 A6 A8 A10 A12 A14 A16 S1 5.59E-03 -6.00E-03 -3.37E-03 -1.51E-03 -5.62E-04 -2.01E-04 -8.40E-05 S2 -8.23E-02 3.28E-03 -3.95E-03 -4.34E-04 -3.64E-04 -2.13E-04 -2.42E-05 S3 -1.51E-01 4.08E-02 5.80E-04 4.98E-04 -4.36E-04 -1.58E-04 -9.29E-05 S4 -2.99E-01 4.54E-02 4.96E-03 3.10E-03 4.36E-04 6.49E-05 -9.19E-05 S5 -1.16E-01 -6.27E-03 7.82E-03 3.50E-03 7.59E-04 -1.01E-04 -4.02E-05 S6 -2.00E-01 -3.41E-03 2.50E-03 2.07E-03 4.84E-04 -8.71E-05 -5.65E-05 S7 -2.97E-01 -3.13E-04 1.90E-03 2.26E-03 1.48E-03 4.16E-04 4.03E-05 S8 -6.43E-01 5.89E-02 6.74E-04 9.48E-03 2.70E-03 1.68E-03 -1.22E-05 S9 -3.55E-01 -2.53E-01 7.92E-02 -3.75E-02 4.84E-02 -1.33E-02 5.66E-03 S10 -2.80E+00 4.02E-01 -1.12E-01 2.88E-02 -3.82E-03 7.12E-03 -1.02E-02 S11 -1.30E+00 -1.17E-01 -2.95E-03 7.83E-02 -2.67E-02 -9.33E-03 9.53E-03 S12 2.05E+00 -4.47E-01 4.38E-02 6.17E-02 -3.78E-02 4.27E-03 2.91E-02 S13 1.20E+00 5.15E-01 -3.48E-01 1.33E-01 2.69E-03 -1.29E-02 6.77E-03 S14 -6.23E+00 9.10E-01 -3.26E-01 9.09E-02 -3.33E-02 2.59E-02 1.52E-03

[0094] Table 5-1

[0095]

[0096]

[0097] Table 5-2

[0098] As shown in Figure 4A and Figure 4B , the optical imaging system 2001 and the optical imaging system 2002 each include six spacers, wherein the first spacer P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth spacer P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. The above spacers can block the entry of external stray light, make the lenses better abut the lens barrel, and enhance the structural stability of the optical imaging system 2001 and the optical imaging system 2002.

[0099] Table 6 shows the basic parameters of the spacers and the lens barrel of the optical imaging system 2001 and the optical imaging system 2002 of Example 2, wherein the units of the parameters in Table 6 are millimeters (mm).

[0100]

[0101]

[0102] Table 6

[0103] Figure 5A The on-axis chromatic aberration curves of the optical imaging system 2001 and the optical imaging system 2002 of Embodiment 2 are shown, which represent the deviation of light rays of different wavelengths from the convergent focal point after passing through the lens. Figure 5B The distortion curves of the optical imaging system 2001 and the optical imaging system 2002 of Embodiment 2 are shown, which represent the distortion size values corresponding to different image heights. Figure 5C The magnification chromatic aberration curves of the optical imaging system 2001 and the optical imaging system 2002 of Embodiment 2 are shown, which represent the deviation of light rays on the imaging plane at different image heights after passing through the lens. According to the magnification chromatic aberration curves, the optical imaging system 2001 and the optical imaging system 2002 of Embodiment 2 have good performance. Figures 5A to 5C It can be seen that the optical imaging system 2001 and the optical imaging system 2002 given by Embodiment 2 can achieve good imaging quality.

[0104] Example 3

[0105] The following refers to Figures 6A to 7C The optical imaging system 3001 and the optical imaging system 3002 according to Embodiment 3 of the present application are described. Figure 6A and Figure 6B The structural schematic diagrams of the optical imaging system 3001 and the optical imaging system 3002 according to Embodiment 3 of the present application are shown, respectively.

[0106] As shown in Figure 6A and Figure 6B The optical imaging system 3001 and the optical imaging system 3002 each include a lens barrel P0, lens groups E1-E7, and a plurality of spacers P1-P6.

[0107] As shown in Figure 6A and Figure 6BAs shown, the optical imaging system 3001 and the optical imaging system 3002 employ the same lens group, which 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, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object side surface S1 and an image side surface S2. The second lens E2 has an object side surface S3 and an image side surface S4. The third lens E3 has an object side surface S5 and an image side surface S6. The fourth lens E4 has an object side surface S7 and an image side surface S8. The fifth lens E5 has an object side surface S9 and an image side surface S10. The sixth lens E6 has an object side surface S11 and an image side surface S12. The seventh lens E7 has an object side surface S13 and an image side surface S14. A filter (not shown) has an object side surface S15 (not shown) and an image side surface S16 (not shown), and light from an object sequentially passes through the surfaces S1 to S16 and is finally imaged on an imaging surface S17 (not shown).

[0108] In the present example, the effective focal length f of the optical imaging system 3001 and the optical imaging system 3002 is 7.79 mm, the maximum half field angle Semi-FOV of the optical imaging system 3001 and the optical imaging system 3002 is 36.00°, and the F-number Fno of the optical imaging system 3001 and the optical imaging system 3002 is 1.89.

[0109] Table 7 shows a basic parameter table of the lens group of the optical imaging system 3001 and the optical imaging system 3002 of Example 3, wherein the units of the curvature radius, the thickness, and the effective focal length are millimeters (mm). Tables 8-1 and 8-2 show the high-order term coefficients of the aspherical surfaces that can be used in the lens group of the optical imaging system 3001 and the optical imaging system 3002 of Example 3, wherein each aspherical surface can be defined by the formula (1) given in Example 1 above.

[0110]

[0111]

[0112] Table 7

[0113] Face No. A4 A6 A8 A10 A12 A14 A16 S1 7.03E-03 4.49E-03 -3.81E-04 1.01E-04 -2.23E-04 -5.76E-05 -3.52E-05 S2 -1.93E-01 2.52E-02 -4.73E-03 1.07E-03 -7.56E-04 -3.38E-06 6.12E-05 S3 -2.41E-01 5.65E-02 -9.09E-03 6.67E-03 -3.84E-03 1.68E-03 -8.08E-04 S4 -1.97E-01 3.27E-02 1.76E-03 4.05E-03 -1.36E-03 6.00E-04 -2.38E-05 S5 -2.26E-01 1.61E-02 -3.10E-03 1.94E-03 -8.46E-04 2.99E-04 2.92E-05 S6 -1.70E-02 -2.04E-02 7.78E-03 -2.11E-03 8.72E-04 -1.35E-04 2.67E-04 S7 -2.02E-01 -1.05E-03 5.91E-05 2.94E-03 2.57E-04 5.33E-04 3.62E-05 S8 -4.05E-01 6.48E-03 -1.75E-03 3.73E-03 3.78E-04 7.67E-04 9.97E-05 S9 -8.12E-02 -1.57E-01 4.05E-02 -3.14E-02 1.33E-02 -7.49E-03 5.67E-03 S10 -2.22E+00 3.11E-01 -6.71E-02 1.91E-02 -1.31E-02 7.76E-03 -1.42E-03 S11 -1.04E+00 -1.84E-01 4.15E-02 2.70E-02 -3.57E-03 1.58E-03 -7.43E-04 S12 1.43E+00 -4.16E-01 1.49E-01 -1.64E-02 -4.22E-03 2.33E-03 -1.93E-03 S13 1.36E-01 5.09E-01 -1.83E-01 2.26E-02 1.04E-02 -6.41E-03 -2.04E-03 S14 -4.68E+00 8.79E-01 -2.65E-01 7.09E-02 -3.27E-02 1.23E-02 -6.15E-03

[0114] Table 8-1

[0115]

[0116]

[0117] Table 8-2

[0118] As Figure 6A and Figure 6BAs shown, the optical imaging system 3001 and the optical imaging system 3002 each includes six spacers, wherein the first spacer P1 is disposed on the image side of the first lens and at least partially contacts the image side surface of the first lens; the second spacer P2 is disposed on the image side of the second lens and at least partially contacts the image side surface of the second lens; the third spacer P3 is disposed on the image side of the third lens and at least partially contacts the image side surface of the third lens; the fourth spacer P4 is disposed on the image side of the fourth lens and at least partially contacts the image side surface of the fourth lens; the fifth spacer P5 is disposed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens; and the sixth spacer P6 is disposed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. The spacers can prevent external stray light from entering, make the lenses better abut the lens barrel, and enhance the structural stability of the optical imaging system 3001 and the optical imaging system 3002.

[0119] Table 9 shows the basic parameters of the spacers and the lens barrel of the optical imaging system 3001 and the optical imaging system 3002 of Example 3, and the units of the parameters in Table 9 are millimeters (mm).

[0120] Parameters / Optical Imaging System Optical imaging system 3001 Optical imaging system 3002 D1s 6.842 7.195 D5s 11.293 10.945 D5m 11.293 10.945 d6s 7.890 7.789 d6m 7.890 7.789 D0s 8.598 11.273 D0m 13.200 12.476 EP01 1.098 1.296 CP2 0.018 0.024 EP23 0.783 0.735 CP3 0.018 0.016 EP34 1.180 1.213 CP4 1.285 1.203 EP56 1.215 1.164 CP6 0.018 0.033 L 8.708 8.956

[0121] Table 9

[0122] Figure 7A The axial chromatic aberration curves of the optical imaging system 3001 and the optical imaging system 3002 of Example 3 are shown, which represent the deviation of light rays of different wavelengths from the converging focal point after passing through the lens. Figure 7B The distortion curves of the optical imaging system 3001 and the optical imaging system 3002 of Example 3 are shown, which represent the distortion size values corresponding to different image heights. Figure 7C The magnification chromatic aberration curves of the optical imaging system 3001 and the optical imaging system 3002 of Example 3 are shown, which represent the deviation of light rays on the imaging plane after passing through the lens at different image heights. According to the magnification chromatic aberration curves, the optical imaging system 3001 and the optical imaging system 3002 of Example 3 can correct the magnification chromatic aberration of the optical imaging system 3001 and the optical imaging system 3002. Figures 7A to 7C It can be known that the optical imaging system 3001 and the optical imaging system 3002 given in Example 3 can achieve good imaging quality.

[0123] Example 4

[0124] The following refers to Figures 8A to 9C The optical imaging system 4001 and the optical imaging system 4002 according to Example 4 of the present application are described. Figure 8A and Figure 8B The structural schematic diagrams of the optical imaging system 4001 and the optical imaging system 4002 according to Example 4 of the present application are shown, respectively.

[0125] As Figure 8A and Figure 8BAs shown, both optical imaging system 4001 and optical imaging system 4002 include a lens barrel P0, lens groups E1 to E7, and multiple isolation components P1 to P6.

[0126] like Figure 8A and Figure 8B As shown, optical imaging systems 4001 and 4002 employ the same lens group, which, from the object side to the image side, sequentially includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens E1 has an object-side surface S1 and an image-side surface S2. The second lens E2 has an object-side surface S3 and an image-side surface S4. The third lens E3 has an object-side surface S5 and an image-side surface S6. The fourth lens E4 has an object-side surface S7 and an image-side surface S8. The fifth lens E5 has an object-side surface S9 and an image-side surface S10. The sixth lens E6 has an object-side surface S11 and an image-side surface S12. The seventh lens E7 has an object-side surface S13 and an image-side surface S14. A filter (not shown) has an object-side surface S15 (not shown) and an image-side surface S16 (not shown). Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging surface S17 (not shown).

[0127] In this example, the effective focal length f of both optical imaging system 4001 and optical imaging system 4002 is 6.65mm, the maximum semi-field of view (Semi-FOV) of both optical imaging system 4001 and optical imaging system 4002 is 36.00°, and the aperture number Fno of both optical imaging system 4001 and optical imaging system 4002 is 1.89.

[0128] Table 10 shows the basic parameters of the lens groups of optical imaging systems 4001 and 4002 in Embodiment 4, wherein the units of radius of curvature, thickness and effective focal length are millimeters (mm). Tables 11-1 and 11-2 show the higher-order coefficients that can be used for each aspherical mirror in Embodiment 4, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0129]

[0130]

[0131] Table 10

[0132] Face No. A4 A6 A8 A10 A12 A14 A16 S1 4.19E-02 2.68E-03 -1.20E-03 3.75E-04 -3.69E-04 9.96E-05 -1.30E-04 S2 -9.20E-02 1.35E-02 -4.62E-03 2.09E-03 -1.17E-03 -6.98E-04 7.22E-04 S3 -1.42E-01 5.26E-02 -2.20E-02 1.17E-02 -6.32E-03 2.11E-03 -6.46E-04 S4 -1.86E-01 4.80E-02 -2.02E-02 1.06E-02 -5.07E-03 2.02E-03 -4.86E-04 S5 -9.84E-02 -8.74E-03 1.84E-03 7.92E-04 -3.65E-04 -2.72E-05 2.51E-04 S6 -1.70E-02 -4.79E-03 4.43E-03 -2.72E-03 -3.20E-04 -6.97E-04 -1.30E-04 S7 -2.18E-01 -9.44E-03 -5.79E-03 -2.63E-03 -1.86E-03 -1.07E-03 -7.44E-04 S8 -2.04E-01 6.26E-04 1.98E-03 -1.05E-04 5.03E-04 2.09E-04 1.99E-04 S9 -3.65E-01 2.77E-02 2.06E-03 -9.53E-04 -8.19E-07 -1.00E-04 -1.07E-04 S10 -7.39E-01 4.25E-02 2.16E-03 -5.11E-04 2.57E-04 -1.38E-04 -6.61E-04 S11 -6.70E-01 -6.08E-02 2.57E-03 -2.76E-03 -5.92E-04 -3.63E-05 -1.42E-03 S12 7.42E-01 -1.76E-01 5.69E-02 -1.80E-02 3.35E-03 -1.55E-03 -9.06E-04 S13 -7.31E-01 1.36E-01 1.41E-02 -1.68E-02 7.34E-03 -3.44E-03 7.32E-04 S14 -3.90E+00 6.06E-01 -1.96E-01 5.40E-02 -1.65E-02 3.70E-03 -8.54E-04

[0133] Table 11-1

[0134] Face No. A18 A20 A22 A24 A26 A28 A30 S1 4.41E-05 -1.96E-05 5.34E-05 -8.58E-06 2.34E-05 -1.91E-05 -1.54E-05 S2 -5.72E-04 4.51E-04 -1.76E-04 1.91E-04 -1.41E-04 1.11E-04 -1.07E-04 S3 2.86E-04 -4.75E-05 1.15E-04 -7.75E-05 1.07E-05 -3.91E-05 -8.65E-06 S4 2.33E-04 -8.10E-07 -7.05E-06 -4.54E-05 -2.75E-05 -7.78E-06 -6.20E-06 S5 -3.10E-05 1.01E-04 -5.09E-05 -3.16E-05 -2.44E-05 -1.32E-05 2.57E-06 S6 -2.25E-04 -6.38E-05 -8.67E-05 -2.49E-05 -2.39E-06 -9.97E-07 2.36E-06 S7 -4.41E-04 -2.78E-04 -1.84E-04 -1.20E-04 -5.65E-05 -3.48E-05 -1.16E-05 S8 1.63E-04 1.29E-04 5.57E-05 3.87E-05 2.03E-05 2.02E-05 -6.79E-07 S9 1.13E-04 8.38E-06 -4.47E-05 -2.81E-05 2.28E-06 1.93E-05 8.58E-06 S10 2.82E-04 1.38E-04 3.12E-05 -3.94E-05 -4.90E-06 9.11E-07 7.23E-07 S11 -3.07E-06 3.57E-04 2.34E-04 -4.11E-05 -3.33E-05 -1.73E-05 7.03E-06 S12 5.69E-05 7.39E-04 2.31E-04 -1.03E-04 -5.82E-05 -1.17E-05 -1.46E-06 S13 -8.22E-04 7.04E-04 -1.17E-04 -7.47E-05 2.95E-05 1.10E-06 -1.24E-06 S14 -5.02E-04 3.88E-04 -4.72E-04 4.08E-04 -1.80E-04 9.20E-05 -2.40E-05

[0135] Table 11-2

[0136] As shown in Figure 8A and Figure 8B The optical imaging system 4001 and the optical imaging system 4002 each include six isolators, where the first isolator P1 is disposed on and at least partially contacts the image side of the first lens, the second isolator P2 is disposed on and at least partially contacts the image side of the second lens, the third isolator P3 is disposed on and at least partially contacts the image side of the third lens, the fourth isolator P4 is disposed on and at least partially contacts the image side of the fourth lens, the fifth isolator P5 is disposed on and at least partially contacts the image side of the fifth lens, and the sixth isolator P6 is disposed on and at least partially contacts the image side of the sixth lens. The isolators can block extraneous light, better support the lenses and the lens barrel, and enhance the structural stability of the optical imaging system 4001 and the optical imaging system 4002.

[0137] Table 12 shows the basic parameters of the isolators and the lens barrel of the optical imaging system 4001 and the optical imaging system 4002 of Example 4. The units of the parameters in Table 12 are millimeters (mm).

[0138] Parameters / Optical Imaging System Optical imaging system 4001 Optical imaging system 4002 D1s 5.769 5.676 D5s 7.835 7.888 D5m 7.950 7.894 d6s 5.947 6.101 d6m 5.947 6.101 D0s 6.967 8.970 D0m 11.095 10.455 EP01 0.717 0.732 CP2 0.018 0.022 EP23 0.742 0.727 CP3 0.018 0.016 EP34 0.456 0.511 CP4 0.877 0.768 EP56 0.698 0.652 CP6 0.018 0.041 L 7.543 7.437

[0139] Table 12

[0140] Figure 9A Figure 13 shows the axial chromatic aberration curves of the optical imaging system 4001 and the optical imaging system 4002 of Example 4, which represent the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens. Figure 9B Figure 14 shows the distortion curves of the optical imaging system 4001 and the optical imaging system 4002 of Example 4, which represent the distortion size values corresponding to different image heights. Figure 9C Figure 15 shows the lateral chromatic aberration curves of the optical imaging system 4001 and the optical imaging system 4002 of Example 4, which represent the deviation of the image heights of light rays on the imaging plane after passing through the lens. According to Figures 9A to 9C It can be seen that the optical imaging system 4001 and the optical imaging system 4002 of Example 4 can achieve good imaging quality.

[0141] In summary, the optical imaging systems 1001, 1002, 2001, 2002, 3001, 3002, 4001 and 4002 of Example 1 to Example 4 satisfy the relationships shown in Table 13.

[0142]

[0143]

[0144] Table 13

[0145] The application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated on a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging system described above.

[0146] The above description is merely preferred embodiments of the present application and a description of the principles of the technology used. It should be understood by those skilled in the art that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combinations of the technical features described above, and should also cover other technical solutions formed by any combination of the above technical features or equivalent features without departing from the inventive concept. For example, the technical solutions formed by the mutual replacement of the above features and the technical features disclosed in the present application (but not limited to) having similar functions.

Claims

1. An optical imaging system, characterized in that, include: The lens barrel, the lens assembly placed within the lens barrel, and multiple spacers, wherein, The lens group comprises, sequentially from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens has positive optical power, with a convex object side and a concave image side; the second lens has a convex object side and a concave image side; the third lens has a convex object side and a concave image side; the fourth lens has a convex image side; the fifth lens has a concave image side; the sixth lens has positive optical power, with a convex object side and a convex image side; the seventh lens has negative optical power, with a concave object side and a concave image side; and the optical power combinations of the second to fifth lenses are any of the following: positive-negative-positive-negative, negative-positive-negative-positive, or negative-positive-positive-negative. The plurality of isolation components include: The third isolator is placed on the image side of the third lens and contacts the image side portion of the third lens; A fourth spacer is disposed on the image side of the fourth lens and in contact with the image side portion of the fourth lens; and The sixth isolator is placed on the image side of the sixth lens and contacts the image side portion of the sixth lens; Of the first to the seventh lenses, the fourth lens has the greatest center thickness along the optical axis; The optical imaging system has seven lenses with optical power. The effective focal length f4 of the fourth lens, the maximum thickness CP4 of the fourth isolator along the optical axis, the effective focal length f3 of the third lens, and the maximum thickness CP3 of the third isolator along the optical axis satisfy: 9.19 ≤ |f4 / CP4 + CP3 / f3| ≤ 29.51; and The inner diameter d6s of the object side of the sixth isolator, the inner diameter d6m of the image side of the sixth isolator, the radius of curvature R12 of the image side of the sixth lens, and the radius of curvature R13 of the object side of the seventh lens satisfy: 5.38≤(d6m+d6s) / (R12-R13)≤8.58; The curvature radius R11 of the object side of the sixth lens, the curvature radius R12 of the image side of the sixth lens, the curvature radius R13 of the object side of the seventh lens, the curvature radius R14 of the image side of the seventh lens, and the maximum thickness CP6 of the sixth isolator along the optical axis satisfy: -2.11mm≤(R11 / R12+R13 / R14)×CP6≤-0.05mm.

2. The optical imaging system according to claim 1, characterized in that, The distance EP34 between the image side of the third isolator and the object side of the fourth isolator along the optical axis, the center thickness CT3 of the third lens on the optical axis, the maximum thickness CP4 of the fourth isolator along the optical axis, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 2.04≤EP34 / CT3+CP4 / T45≤4.

84.

3. The optical imaging system according to claim 1, characterized in that, The effective focal length f4 of the fourth lens and the distance EP34 from the image side of the third isolator to the object side of the fourth isolator along the optical axis satisfy: 11.75≤|f4 / EP34|≤20.

52.

4. The optical imaging system according to claim 1, characterized in that, The radius of curvature R8 of the image side of the fourth lens and the maximum thickness CP4 of the fourth isolator along the optical axis satisfy: -39.97≤R8 / CP4≤-4.

60.

5. The optical imaging system according to claim 1, characterized in that, The maximum thickness CP4 of the fourth isolator along the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy the following condition: 0.63≤CP4 / CT4≤0.

81.

6. The optical imaging system according to any one of claims 1-5, characterized in that, The plurality of isolating elements further includes: a fifth isolating element, disposed on the image side of the fifth lens and in contact with a portion of the image side surface of the fifth lens; wherein, The effective focal length f6 of the sixth lens, the distance EP56 between the image side of the fifth isolator and the object side of the sixth isolator along the optical axis, and the maximum thickness CP6 of the sixth isolator along the optical axis satisfy: 2.71≤f6 / (EP56+CP6)≤5.

91.

7. The optical imaging system according to any one of claims 1-5, characterized in that, The plurality of isolating elements further includes: a fifth isolating element, disposed on the image side of the fifth lens and in contact with a portion of the image side surface of the fifth lens; wherein, The outer diameter D5s of the object side of the fifth isolator, the outer diameter D5m of the image side of the fifth isolator, the radius of curvature R10 of the image side of the fifth lens, and the radius of curvature R11 of the object side of the sixth lens satisfy: 0.77≤D5s / R10+D5m / R11≤6.

21.

8. The optical imaging system according to any one of claims 1-5, characterized in that, The effective focal length f of the optical imaging system, the maximum semi-FOV of the optical imaging system, the outer diameter D0m of the image-side end face of the lens barrel and the outer diameter D0s of the object-side end face of the lens barrel satisfy the following condition: 10.31≤f / tan(Semi-FOV)+D0m / D0s≤12.

26.

9. The optical imaging system according to any one of claims 1-5, characterized in that, The plurality of isolating elements further includes: a second isolating element, disposed on the image side of the second lens and in contact with a portion of the image side surface of the second lens; wherein, The radius of curvature R4 of the image side of the second lens, the radius of curvature R5 of the object side of the third lens, the distance EP23 between the image side of the second isolator and the object side of the third isolator along the optical axis, and the maximum thickness CP2 of the second isolator along the optical axis satisfy: 19.36≤R4 / R5+EP23 / CP2≤56.

75.

10. The optical imaging system according to any one of claims 1-5, characterized in that, The effective focal length f of the optical imaging system, the maximum semi-field-of-view (Semi-FOV) of the optical imaging system, and the maximum height L of the lens barrel along the optical axis satisfy the following condition: 0.63 ≤ f / L × tan(Semi-FOV) ≤ 0.

84.

11. The optical imaging system according to any one of claims 1-5, characterized in that, The plurality of isolating elements further includes: a first isolating element, disposed on the image side of the first lens and in contact with a portion of the image side surface of the first lens; wherein, The outer diameter D1s of the object side of the first isolator, the distance EP01 from the object side end face of the lens barrel to the object side of the first isolator along the optical axis, the maximum height L of the lens barrel along the optical axis, and the distance TD from the object side of the first lens to the image side of the seventh lens along the optical axis satisfy: 5.68≤D1s / EP01+L / TD≤9.

07.

12. The optical imaging system according to any one of claims 1-5, characterized in that, The plurality of isolating elements further includes: a second isolating element, disposed on the image side of the second lens and in contact with a portion of the image side surface of the second lens; wherein, The distance TD between the object side of the first lens and the image side of the seventh lens on the optical axis, the interval EP23 between the image side of the second isolator and the object side of the third isolator along the optical axis, and the distance EP34 between the image side of the third isolator and the object side of the fourth isolator along the optical axis satisfy: 4.18≤TD / (EP23+EP34)≤6.14.

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