Optical camera system

Abstract

The application discloses an optical camera 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 with positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens with positive refractive power, a seventh lens and an eighth lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; and the plurality of isolators comprise a sixth isolator arranged on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, and a seventh isolator arranged on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens; the effective focal length f of the optical camera system, the inner diameter d6m of the image side surface of the sixth isolator, the inner diameter d7m of the image side surface of the seventh isolator and the maximum field angle FOV of the optical camera system satisfy the following relationship: 1.0 < [f x tan (FOV / 2)] / [(d7m-d6m) / 2] < 10.0.

Description

TECHNICAL FIELD

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

[0002] With the comprehensive popularization of smart phones in people's daily life, the competition in the smart phone market is becoming more and more fierce, and the requirements of smart phones on the shooting effect of lenses are also gradually increasing. In particular, in order to meet the demand for higher quality imaging, the high piece number camera system generally has a relatively large image surface, so that it is not easy to balance the relative luminance when controlling stray light. In order to control the stray light ghost image generated by the rear lens group, the design of the rear lens group, including the position, surface type and aperture of the lens, needs to be optimized according to the module image surface, so as to achieve the balance of optical performance and stray light ghost image, but the control of the relative luminance is easily ignored, and the problem of uneven change of relative luminance is easily caused

[0003] Therefore, it is still one of the research focuses of those skilled in the art to design an eight-piece optical camera system with good imaging quality, good stray light performance of the rear lens group, and relative luminance of the outer field of view meeting the requirements. SUMMARY

[0004] The present application provides an optical camera system, which comprises a lens barrel, a lens group and a plurality of isolation pieces 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 with positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens with positive refractive power, a seventh lens and an eighth lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a convex surface; and the plurality of isolation pieces comprises a sixth isolation piece arranged on the image side of the sixth lens and at least partially in contact with the image side surface of the sixth lens, and a seventh isolation piece arranged on the image side of the seventh lens and at least partially in contact with the image side surface of the seventh lens; the effective focal length f of the optical camera system, the inner diameter d6m of the image side surface of the sixth isolation piece, the inner diameter d7m of the image side surface of the seventh isolation piece and the maximum field angle FOV of the optical camera system satisfy: 1.0 < [f x tan(FOV / 2)] / [(d7m-d6m) / 2] < 10.0.

[0005] In one embodiment, at least one lens in the lens set has negative refractive power; and the optical camera system satisfies: 0 < Djs / Ri < 50.0, where i = 2j, j = 2, 3 or 8, Ri is the radius of curvature of the image side surface of the lens with negative refractive power, Djs is the outer diameter of the object side surface of the spacer placed on the image side of the lens with negative refractive power and at least partially in contact with the image side surface of the lens; where j takes 2, i = 4, the second lens has negative refractive power, R4 represents the radius of curvature of the image side surface of the second lens, D2s represents the outer diameter of the object side surface of the second spacer placed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; j takes 3, i = 6, the third lens has negative refractive power, R6 represents the radius of curvature of the image side surface of the third lens, D3s represents the outer diameter of the object side surface of the third spacer placed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; j takes 8, i = 16, the eighth lens has negative refractive power, R16 represents the radius of curvature of the image side surface of the eighth lens, D8s represents the outer diameter of the object side surface of the eighth spacer placed on the image side of the eighth lens and at least partially in contact with the image side surface of the eighth lens.

[0006] In one embodiment, the optical camera system satisfies: -100.0 < fk / (dws-dks) < 110.0, k = 2, 3 or 4, w = k-1; where fk is the effective focal length of the kth lens, dws is the inner diameter of the object side surface of the spacer placed on the image side of the k-1th lens and at least partially in contact with the image side surface of the k-1th lens, dks is the inner diameter of the object side surface of the spacer placed on the image side of the kth lens and at least partially in contact with the image side surface of the kth lens; where k takes 2, w = 1, f2 is the effective focal length of the second lens, d1s is the inner diameter of the object side surface of the first spacer placed on the image side surface of the first lens and at least partially in contact with the image side of the first lens, d2s is the inner diameter of the object side surface of the second spacer placed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; k takes 3, w = 2, f3 is the effective focal length of the third lens, d2s is the inner diameter of the object side surface of the second spacer placed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, d3s is the inner diameter of the object side surface of the third spacer placed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; k takes 4, w = 3, f4 is the effective focal length of the fourth lens, d3s is the inner diameter of the object side surface of the third spacer placed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, d4s is the inner diameter of the object side surface of the fourth spacer placed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens.

[0007] In one embodiment, the plurality of isolators further includes: a first isolator disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens; and a second isolator disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens; wherein the combined focal length f12 of the first lens and the second lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the distance EP01 from the object side end face of the lens barrel to the object side surface of the first isolator along the optical axis, and the distance EP12 between the image side surface of the first isolator and the object side surface of the second isolator along the optical axis satisfy: 20.0 <f12×(N1+N2) / (EP01+EP12)<30.0。

[0008] In one embodiment, the plurality of isolation members further includes: a first isolation member disposed on the image side of the first lens and at least partially in contact with the image side of the first lens; and a second isolation member disposed on the image side of the second lens and at least partially in contact with the image side of the second lens; wherein the dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, the distance EP12 between the image side of the first isolation member and the object side of the second isolation member along the optical axis, the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: (V1+V2)×EP12 / (CT1+CT2)<50.0.

[0009] In one embodiment, the plurality of isolation members further includes: a first isolation member disposed on the image side of the first lens and in at least partial contact with the image side of the first lens; and a second isolation member disposed on the image side of the second lens and in at least partial contact with the image side of the second 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 isolation member, the air gap T12 between the first lens and the second lens on the optical axis, and the distance EP12 between the image side of the first isolation member and the object side of the second isolation member along the optical axis satisfy: 20.0 < (R3 + d1m) / (T12 + EP12) < 35.0.

[0010] In one embodiment, the plurality of isolation members further includes: a third isolation member disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; and a fourth isolation member disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens; wherein the air gap T34 between the second and fourth lenses on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis, the distance EP34 between the image side of the third isolation member and the object side of the fourth isolation member along the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the dispersion coefficient V4 of the fourth lens and the refractive index N4 of the fourth lens satisfy: 5.0 < (T34 + T45) × V4 / [(CT4 + EP34) × N4] < 10.0.

[0011] In one embodiment, the plurality of isolation members further includes: a third isolation member disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; a fourth isolation member disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens; and a fifth isolation member disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens; wherein the combined focal length f345 of the third, fourth, and fifth lenses, the distance EP34 between the image side of the third isolation member and the object side of the fourth isolation member along the optical axis, and the distance EP45 between the image side of the fourth isolation member and the object side of the fifth isolation member along the optical axis satisfy: 10.0 <f345 / (EP34+EP45)<30.0。

[0012] In one embodiment, the plurality of isolation members further includes: a first isolation member, placed on the image side of the first lens and at least partially 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 effective focal length f1 of the first lens, and the distance EP01 from the object side end face of the lens barrel to the object side of the first isolation member along the optical axis satisfy: 0 < (R1 + R2) / (f1 + EP01) < 8.0.

[0013] In one embodiment, the plurality of isolators further includes: a second isolator disposed on the image side of the second lens and at least partially in contact with the image side of the second lens; and a third isolator disposed on the image side of the third lens and at least partially in contact with the image side of the third lens; wherein the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, the inner diameter d2m of the image side of the second isolator, the outer diameter D2m of the image side of the second isolator, the inner diameter d3s of the object side of the third isolator, and the outer diameter D3s of the object side of the third isolator satisfy: 3.0 <R5 / (D2m-d2m)+R6 / (D3s-d3s)<10.0。

[0014] In one embodiment, the plurality of isolation members further includes: a fourth isolation member disposed on the image side of the fourth lens and in at least partial contact with the image side of the fourth lens; and a fifth isolation member disposed on the image side of the fifth lens and in at least partial contact with the image side of the fifth lens; wherein the radius of curvature R8 of the image side of the fourth lens, the radius of curvature R10 of the image side of the fifth lens, the outer diameter D4s of the object side of the fourth isolation member, and the outer diameter D5s of the object side of the fifth isolation member satisfy: -5.0<(R8+R10) / D4s+(R8-R10) / D5s<0.

[0015] In one embodiment, the plurality of spacers further includes: a fifth spacer disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens; wherein, the radius of curvature R9 of the object side surface of the fifth lens, the radius of curvature R10 of the image side surface of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer satisfy: R9 < R10 < 0 and -10.0 < (R9 - R10) / d5s < 0.

[0016] In one embodiment, the plurality of spacers further includes: a first spacer disposed on the image side of the first lens and at least partially contacting the image side surface of the first lens; wherein, 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 outer diameter D1s of the object side surface of the first spacer, and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 0.1 < (R1 + R2) / (D1s + D0s) < 4.0.

[0017] In one embodiment, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical imaging system satisfy: f5 / f > 0, f6 / f > 0, and f7 / f > 0.

[0018] In one embodiment, the optical imaging system satisfies: 1.0 < fk / dkm < 20.0, where k = 5, 6, or 7; wherein, fk is the effective focal length of the k-th lens, and dkm is the inner diameter of the image side surface of the spacer disposed on the image side of the k-th lens and at least partially contacting the image side surface of the k-th lens; when k = 5, f5 is the effective focal length of the fifth lens, and d5m is the inner diameter of the image side surface of the fifth spacer disposed on the image side of the fifth lens and at least partially contacting the image side surface of the fifth lens; when k = 6, f6 is the effective focal length of the sixth lens, and d6m is the inner diameter of the image side surface of the sixth spacer disposed on the image side of the sixth lens and at least partially contacting the image side surface of the sixth lens; when k = 7, f7 is the effective focal length of the seventh lens, and d7m is the inner diameter of the image side surface of the seventh spacer disposed on the image side of the seventh lens and at least partially contacting the image side surface of the seventh lens.

[0019] In one embodiment, the plurality of spacers further includes: a sixth spacer disposed on the image side of the sixth lens and at least partially contacting the image side surface of the sixth lens; wherein, 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 outer diameter D6m of the image side surface of the sixth spacer, and the inner diameter d6m of the image side surface of the sixth spacer satisfy: -20.0 < (R11 + R12) / (D6m - d6m) < 0.

[0020] In one embodiment, the radius of curvature R3 of the object side of the second lens, 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 radius of curvature R6 of the image side of the third lens, and the radius of curvature R8 of the image side of the fourth lens satisfy: R3>0, R5>0, R3 / R4>0, R5 / R6>0, and R6 / R8<0.

[0021] The optical imaging system provided in this application includes eight lenses and multiple isolators. By rationally designing the half-image height, the inner diameters of the sixth and seventh isolators, as well as the surface shape and refractive power parameters of the first and sixth lenses, the system ensures that the refractive power of the lens matches the chip position while simultaneously meeting the large image area requirement of the chip. This maximizes the image area and improves image quality. Furthermore, by adjusting the inner diameters of the sixth and seventh isolators to prevent them from becoming excessively large, the optical system exhibits good stray light performance at the sixth and seventh lens positions in the rear lens group, reducing the risk of stray light at these positions. Additionally, this solution also ensures that the inner diameters of the sixth and seventh isolators are not too small, resulting in a smooth change in the relative illumination of the outer field of view, meeting the requirements. Attached Figure Description

[0022] 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:

[0023] Figure 1 A structural layout diagram and schematic diagram of some parameters of an optical imaging system according to this application are shown;

[0024] Figures 2A to 2C A schematic diagram of the structure of an optical imaging system according to Embodiment 1 of this application is shown;

[0025] Figures 3A to 3E The on-axis chromatic aberration curve, astigmatism curve, distortion curve, magnification chromatic aberration curve, and relative illuminance curve of the optical imaging system according to Embodiment 1 of this application are shown respectively.

[0026] Figures 4A to 4C A schematic diagram of the structure of an optical imaging system according to Embodiment 2 of this application is shown;

[0027] Figures 5A to 5E The on-axis chromatic aberration curve, astigmatism curve, distortion curve, magnification chromatic aberration curve, and relative illuminance curve of the optical imaging system according to Embodiment 2 of this application are shown respectively.

[0028] Figures 6A to 6C A schematic diagram of the structure of an optical imaging system according to Embodiment 3 of this application is shown; and

[0029] Figures 7A to 7EThe on-axis chromatic aberration curve, astigmatism curve, distortion curve, magnification chromatic aberration curve, and relative illuminance curve of the optical imaging system according to Embodiment 3 of this application are shown respectively. Detailed Implementation

[0030] 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. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0031] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second or third lens.

[0032] 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.

[0033] 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.

[0034] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, 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.

[0035] 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.

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application. For example, the lens group, lens barrel, and spacer in the various embodiments of this application can be arbitrarily combined, and it is not limited to the lens group in one embodiment being combined only with the lens barrel, spacer, etc. of that embodiment.

[0037] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Figure 1 This diagram illustrates the structural layout and schematic diagrams of some parameters of an optical imaging system according to this application. Those skilled in the art will understand that some parameters commonly used in the art, such as the center thickness CT2 of the second lens on the optical axis, are not shown. Figure 1 As shown in the figure, Figure 1 The following illustrative diagram shows some parameters of the lens barrel and isolator of an optical imaging system according to this application, to facilitate a better understanding of the invention. Other parameters not shown can be deduced similarly. Figure 1 As shown, EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object-side side face of the first isolator; EP12 is the distance along the optical axis between the image-side face of the first isolator and the object-side face of the second isolator; EP34 is the distance along the optical axis between the image-side face of the third isolator and the object-side face of the fourth isolator; EP45 is the distance along the optical axis between the image-side face of the fourth isolator and the object-side face of the fifth isolator; d1s is the inner diameter of the object-side face of the first isolator; D1s is the outer diameter of the object-side face of the first isolator; D0s is the outer diameter of the object-side end face of the lens barrel; d1m is the inner diameter of the image-side face of the first isolator; and D8s is the outer diameter of the object-side face of the eighth isolator.

[0038] An optical imaging system according to an exemplary embodiment of this application includes a lens barrel and a lens assembly and multiple spacers disposed within the lens barrel. The lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially along the optical axis from the object side to the image side. The first lens has positive refractive power, with its object side being convex and its image side being concave; the sixth lens also has positive refractive power, with both its object side and image side being convex.

[0039] In an exemplary embodiment, the plurality of isolation members include a sixth isolation member disposed on the image side of the sixth lens and in at least partial contact with the image side surface of the sixth lens, and a seventh isolation member disposed on the image side of the seventh lens and in at least partial contact with the image side surface of the seventh lens.

[0040] In an exemplary embodiment, the plurality of isolators may include at least one of a first isolator, a second isolator, a third isolator, a fourth isolator, a fifth isolator, a sixth isolator, a seventh isolator, and an eighth isolator; wherein, the first isolator is disposed on the image side of the first lens and at least partially in contact with the image side of the first lens, the second isolator is disposed on the image side of the second lens and at least partially in contact with the image side of the second lens, the third isolator is disposed on the image side of the third lens and at least partially in contact with the image side of the third lens, the fourth isolator is disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens, the fifth isolator is disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens, the sixth isolator is disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens, the seventh isolator is disposed on the image side of the seventh lens and at least partially in contact with the image side of the seventh lens, and the eighth isolator is disposed on the image side of the eighth lens and at least partially in contact with the image side of the eighth lens.

[0041] In an exemplary embodiment, the plurality of isolators further includes a fifth auxiliary isolator disposed on the image side of the fifth isolator and at least partially in contact with the fifth isolator. Further, the plurality of isolators also includes a fifth secondary auxiliary isolator disposed on the image side of the fifth auxiliary isolator and at least partially in contact with the fifth auxiliary isolator.

[0042] It should be understood that this application does not specifically limit the number of isolators; any number of isolators may be included between any two lenses, and the entire optical imaging system may also include any number of isolators. Isolators help the optical imaging system intercept excess refractive and reflected light paths, reducing stray light and ghosting. Adding auxiliary support between the isolators and the lens barrel helps improve problems such as poor assembly stability and low performance yield caused by large step differences between lenses.

[0043] In an exemplary embodiment, the optical imaging system according to the present application can satisfy: 1.0 < [f × tan(FOV / 2)] / [(d7m - d6m) / 2] < 10.0, where f is the effective focal length of the optical imaging system, d6m is the inner diameter of the image side of the sixth spacer, d7m is the inner diameter of the image side of the seventh spacer, and FOV is the maximum field of view angle of the optical imaging system. More specifically, the optical imaging system according to the present application can further satisfy: 3.0 < [f × tan(FOV / 2)] / [(d7m - d6m) / 2] < 6.0. By controlling the semi-image height of the optical imaging system and the inner diameters of the sixth and seventh spacers, while matching the refractive power of the lens with the chip position, the semi-image height of the optical imaging system meets the requirements of the large image plane of the chip, ensuring as large an image plane as possible, improving the image quality. At the same time, by regulating the inner diameters of the sixth and seventh spacer elements not to be too large, the optical system has good stray light performance at the positions of the sixth and seventh lenses in the rear lens group, reducing the risk of stray light at these positions. At the same time, through this solution, the inner diameters of the sixth and seventh spacer elements are also regulated not to be too small, so that the relative illuminance of the outer field of view changes smoothly and meets the requirements.

[0044] In an exemplary embodiment, at least one lens in the lens group of the optical imaging system according to the present application has a negative refractive power, and the optical imaging system can satisfy: 0 < Djs / Ri < 50.0, where i = 2j, j = 2, 3 or 8, Ri is the radius of curvature of the image side of the lens with a negative refractive power, and Djs is the outer diameter of the object side of the spacer placed on the image side of the lens with a negative refractive power and at least partially contacting the image side of the lens. More specifically, the optical imaging system according to the present application can further satisfy: 0 < Djs / Ri < 5.0, where i = 2j, j = 2, 3 or 8. Exemplarily, when j takes 2, i = 4, the second lens has a negative refractive power, R4 represents the radius of curvature of the image side of the second lens, and D2s represents the outer diameter of the object side of the second spacer placed on the image side of the second lens and at least partially contacting the image side of the second lens; Exemplarily, when j takes 3, i = 6, the third lens has a negative refractive power, R6 represents the radius of curvature of the image side of the third lens, and D3s represents the outer diameter of the object side of the third spacer placed on the image side of the third lens and at least partially contacting the image side of the third lens; Exemplarily, when j takes 8, i = 16, the eighth lens has a negative refractive power, R16 represents the radius of curvature of the image side of the eighth lens, and D8s represents the outer diameter of the object side of the eighth spacer placed on the image side of the eighth lens and at least partially contacting the image side of the eighth lens. By controlling the ratio of the radius of curvature of the image side of the lens with a negative refractive power to the outer diameter of the object side of the spacer placed on the image side of the lens and at least partially contacting the lens, the shape of the lens with a negative refractive power is ensured to be uniform and stable, reducing the molding risk and increasing the assembly stability of the lens with a negative refractive power.

[0045] In an exemplary embodiment, the optical imaging system according to the present application satisfies: -100.0 < fk / (dws - dks) < 110.0, where k = 2, 3 or 4, and w = k - 1; wherein, fk is the effective focal length of the k-th lens, dws is the inner diameter of the object side surface of the spacer placed on the image side of the (k - 1)-th lens and at least partially contacting the image side surface of the (k - 1)-th lens, and dks is the inner diameter of the object side surface of the spacer placed on the image side of the k-th lens and at least partially contacting the image side surface of the k-th lens; Exemplarily, when k = 2, w = 1, f2 is the effective focal power of the second lens, d1s is the inner diameter of the object side surface of the first spacer placed on the image side surface of the first lens and at least partially contacting the image side of the first lens, and d2s is the inner diameter of the object side surface of the second spacer placed on the image side of the second lens and at least partially contacting the image side surface of the second lens; Exemplarily, when k = 3, w = 2, f3 is the effective focal power of the third lens, d2s is the inner diameter of the object side surface of the second spacer placed on the image side of the second lens and at least partially contacting the image side surface of the second lens, and d3s is the inner diameter of the object side surface of the third spacer placed on the image side of the third lens and at least partially contacting the image side surface of the third lens; Exemplarily, when k = 4, w = 3, f4 is the effective focal power of the fourth lens, d3s is the inner diameter of the object side surface of the third spacer placed on the image side of the third lens and at least partially contacting the image side surface of the third lens, and d4s is the inner diameter of the object side surface of the fourth spacer placed on the image side of the fourth lens and at least partially contacting the image side surface of the fourth lens. By controlling the ratio of the effective focal length of the front-end lens to the inner diameter difference of the adjacent spacers, the present application achieves the purpose of reserving space for the rear-end lens, while ensuring the structural proximity of the front-end lens and reducing the molding and assembly risks.

[0046] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 20.0 < f12×(N1 + N2) / (EP01 + EP12) < 30.0, where f12 is the combined focal length of the first lens and the second lens, N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, EP01 is the distance along the optical axis from the object side end face of the lens barrel to the object side surface of the first spacer, and EP12 is the distance along the optical axis between the image side surface of the first spacer and the object side surface of the second spacer. Satisfying 20.0 < f12×(N1 + N2) / (EP01 + EP12) < 30.0 is beneficial to controlling the overall thickness of the first lens and the second lens, and achieving the effect of compressing the thickness of the front-end lens on the premise of ensuring processability.

[0047] In an exemplary embodiment, the optical imaging system according to this application satisfies: (V1+V2)×EP12 / (CT1+CT2)<50.0, where V1 is the dispersion coefficient of the first lens, V2 is the dispersion coefficient of the second lens, EP12 is the distance along the optical axis between the image-side surface of the first isolator and the object-side surface of the second isolator, CT1 is the center thickness of the first lens along the optical axis, and CT2 is the center thickness of the second lens along the optical axis. Satisfying (V1+V2)×EP12 / (CT1+CT2)<50.0 is beneficial for adjusting the dispersion of the optical imaging system when the dispersion exceeds the tolerance, by adjusting the thickness of the first and second lenses or the optical axis distance between the first and second isolators.

[0048] In an exemplary embodiment, the optical imaging system according to this application satisfies: 20.0 < (R3 + d1m) / (T12 + EP12) < 35.0, where R3 is the radius of curvature of the object-side surface of the second lens, d1m is the inner diameter of the image-side surface of the first isolator, T12 is the air gap between the first and second lenses on the optical axis, and EP12 is the distance between the image-side surface of the first isolator and the object-side surface of the second isolator along the optical axis. Satisfying 20.0 < (R3 + d1m) / (T12 + EP12) < 35.0 is beneficial for controlling the thickness and overall shape of the second lens, and reducing the risks of lens molding and assembly.

[0049] In an exemplary embodiment, the optical imaging system according to this application satisfies: 5.0 < (T34 + T45) × V4 / [(CT4 + EP34) × N4] < 10.0, where T34 is the air gap between the second and fourth lenses on the optical axis, T45 is the air gap between the fourth and fifth lenses on the optical axis, EP34 is the distance along the optical axis between the image side of the third isolator and the object side of the fourth isolator, CT4 is the center thickness of the fourth lens on the optical axis, V4 is the dispersion coefficient of the fourth lens, and N4 is the refractive index of the fourth lens. Satisfying 5.0 < (T34 + T45) × V4 / [(CT4 + EP34) × N4] < 10.0 is beneficial for controlling the center position and thickness of the third and fourth lenses, providing design space for the back-end lenses, and allowing for corresponding adjustments when dispersion exceeds tolerance by over-adjusting the third and fourth lenses.

[0050] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 10.0 < f345 / (EP34 + EP45) < 30.0, where f345 is the combined focal length of the third lens, the fourth lens, and the fifth lens, EP34 is the distance along the optical axis between the image side of the third spacer and the object side of the fourth spacer, and EP45 is the distance along the optical axis between the image side of the fourth spacer and the object side of the fifth spacer. Satisfying 10.0 < f345 / (EP34 + EP45) < 30.0 is beneficial for achieving the effect of controlling the thickness and shape of the third lens and the fourth lens, and reducing the molding and assembly risks of the third lens and the fourth lens.

[0051] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0 < (R1 + R2) / (f1 + EP01) < 8.0, where R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, f1 is the effective focal length of the first lens, and EP01 is the distance along the optical axis from the object-side end face of the lens barrel to the object side of the first spacer. Satisfying 0 < (R1 + R2) / (f1 + EP01) < 8.0 is beneficial for controlling the shape of the first lens and avoiding the molding risk caused by too large radius of curvature.

[0052] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 3.0 < R5 / (D2m - d2m) + R6 / (D3s - d3s) < 10.0, where R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, d2m is the inner diameter of the image side of the second spacer, D2m is the outer diameter of the image side of the second spacer, d3s is the inner diameter of the object side of the third spacer, and D3s is the outer diameter of the object side of the third spacer. Satisfying 3.0 < R5 / (D2m - d2m) + R6 / (D3s - d3s) < 10.0 is beneficial for controlling the shape and outer diameter size of the third lens, defining the bearing position of the third lens, avoiding the bearing step difference between the third lens and other lenses, and reducing the assembly risk.

[0053] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -5.0 < (R8 + R10) / D4s + (R8 - R10) / D5s < 0, where R8 is the radius of curvature of the image side of the fourth lens, R10 is the radius of curvature of the image side of the fifth lens, D4s is the outer diameter of the object side of the fourth spacer, and D5s is the outer diameter of the object side of the fifth spacer. Satisfying -5.0 < (R8 + R10) / D4s + (R8 - R10) / D5s < 0 is beneficial for defining the overall shapes of the fourth lens and the fifth lens, avoiding the molding risk caused by the radius of curvature, and at the same time constraining the outer diameters of the corresponding lenses through the outer diameters of the fourth spacer and the fifth spacer, thereby improving the assembly stability.

[0054] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: R9 < R10 < 0 and -10.0 < (R9 - R10) / d5s < 0, where R9 is the radius of curvature of the object side surface of the fifth lens, R10 is the radius of curvature of the image side surface of the fifth lens, and d5s is the inner diameter of the object side surface of the fifth spacer. Satisfying R9 < R10 < 0 and -10.0 < (R9 - R10) / d5s < 0 limits the thickness-to-thickness ratio of the optical part of the fifth lens and reduces the molding risk.

[0055] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 0.1 < (R1 + R2) / (D1s + D0s) < 4.0, where R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, D1s is the outer diameter of the object side surface of the first spacer, and D0s is the outer diameter of the object side end face of the lens barrel. Satisfying 0.1 < (R1 + R2) / (D1s + D0s) < 4.0 is beneficial to controlling the wall thickness of the lens barrel, reducing the reliability risk of the lens while ensuring the overall strength of the lens.

[0056] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: f5 / f > 0, f6 / f > 0, and f7 / f > 0, where f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical imaging system. Satisfying f5 / f > 0, f6 / f > 0, and f7 / f > 0 controls the focal length directions of the fifth, sixth, and seventh lenses to be consistent with the focal length direction of the lens, which helps to control the reasonable matching of the focal lengths of the fifth, sixth, and seventh lenses, so as to better cooperate with other lenses and enable the imaging system to have better imaging quality.

[0057] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: 1.0 < fk / dkm < 20.0, where k = 5, 6 or 7. Here, fk is the effective focal length of the k-th lens, and dkm is the inner diameter of the image side surface of the spacer that is placed on the image side of the k-th lens and at least partially contacts the image side surface of the k-th lens. When k = 5, f5 is the effective focal length of the fifth lens, and d5m is the inner diameter of the image side surface of the fifth spacer that is placed on the image side of the fifth lens and at least partially contacts the image side surface of the fifth lens. When k = 6, f6 is the effective focal length of the sixth lens, and d6m is the inner diameter of the image side surface of the sixth spacer that is placed on the image side of the sixth lens and at least partially contacts the image side surface of the sixth lens. When k = 7, f7 is the effective focal length of the seventh lens, and d7m is the inner diameter of the image side surface of the seventh spacer that is placed on the image side of the seventh lens and at least partially contacts the image side surface of the seventh lens. By controlling the ratio of the effective focal length of the lens to the inner diameter of the corresponding spacer of the lens, the present application is beneficial to regulating the position and shape of the rear lens to suppress the rear lens ghost image. At the same time, it is also beneficial to reduce the sensitivity of the optical imaging system and make the refractive power and field angle of the lens match the chip.

[0058] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: -20.0 < (R11 + R12) / (D6m - d6m) < 0, where R11 is the curvature radius of the object side surface of the sixth lens, R12 is the curvature radius of the image side surface of the sixth lens, D6m is the outer diameter of the image side surface of the sixth spacer, and d6m is the inner diameter of the image side surface of the sixth spacer. Satisfying -20.0 < (R11 + R12) / (D6m - d6m) < 0 is beneficial to ensuring the uniform and stable shape of the sixth lens, reducing the molding risk, and increasing the assembly stability.

[0059] In an exemplary embodiment, the optical imaging system according to the present application may satisfy: R3 > 0, R5 > 0, R3 / R4 > 0, R5 / R6 > 0, and R6 / R8 < 0, where R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens, R5 is the curvature radius of the object side surface of the third lens, R6 is the curvature radius of the image side surface of the third lens, and R8 is the curvature radius of the image side surface of the fourth lens. By controlling the ratio of the curvature radii of the second lens, the third lens, and the fourth lens, the present application provides conditions for the position and structure setting of the rear lens, ensuring performance indicators such as the refractive power and field angle of the lens.

[0060] In embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface; that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the eighth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that its curvature changes continuously from the center to the periphery of the lens. Unlike spherical lenses, which have a constant curvature from the center to the periphery, aspherical lenses have better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. By using aspherical lenses, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, the object-side and image-side surfaces of all lenses from the first to the eighth lens are aspherical mirror surfaces.

[0061] In an exemplary embodiment, the first lens may have positive refractive power, the second lens may have positive or negative refractive power, the third lens may have negative refractive power, the fourth lens may have positive refractive power, the fifth lens may have positive refractive power, the sixth lens may have positive refractive power, the seventh lens may have positive refractive power, and the eighth lens may have negative refractive power.

[0062] In an exemplary embodiment, the optical imaging system described above may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0063] The optical imaging system according to the above embodiments of this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the refractive power, surface shape, and arrangement of the spacers of each lens, the range of each stop in the lens-lens connection is made more uniform, enhancing the light-gathering ability and improving the imaging quality of ultra-thin, large-image-plane imaging lenses. 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 in this application to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiments, the optical imaging system is not limited to including eight lenses. If necessary, the optical imaging system may also include other numbers of lenses.

[0064] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging system applicable to the above-described embodiments.

[0065] Example 1

[0066] The following is for reference Figures 2A to 3E The optical imaging system 1001, optical imaging system 1002 and optical imaging system 1003 according to Embodiment 1 of this application are described. Figures 2A to 2C Schematic diagrams of the optical imaging system 1001, optical imaging system 1002 and optical imaging system 1003 according to Embodiment 1 of this application are shown respectively.

[0067] like Figures 2A to 2C As shown, optical camera systems 1001, 1002, and 1003 each include a lens barrel P0, lens groups E1 to E8, and multiple isolation components P1 to P8.

[0068] like Figures 2A to 2C As shown, optical imaging systems 1001, 1002, and 1003 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, a seventh lens E7, and an eighth lens E8. 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. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto imaging surface S17 (not shown).

[0069] Table 1 shows the basic parameters of the lens groups of optical imaging systems 1001, 1002, and 1003 in Embodiment 1, wherein the units for radius of curvature, thickness, and effective focal length are all millimeters (mm).

[0070]

[0071] Table 1

[0072] In this example, the effective focal length f of optical imaging systems 1001, 1002, and 1003 is 7.50 mm, the combined focal length f12 of the first and second lenses is 11.02 mm, the combined focal length f345 of the third, fourth, and fifth lenses is 25.17 mm, the maximum field of view (FOV) of optical imaging systems 1001, 1002, and 1003 is 80.0°, and the distance TTL on the optical axis from the object side of the first lens of optical imaging systems 1001, 1002, and 1003 is 9.8 mm.

[0073] In Example 1, the object-side surface and image-side surface of any one of the first lens E1 to the eighth lens E8 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0074]

[0075] 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, A16, A26, A36, A47, A68, A166 that can be used for each aspherical mirror S1-S16 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0076]

[0077] Table 2

[0078] like Figures 2A to 2C As shown, optical imaging systems 1001, 1002, and 1003 each include 10 isolation components, namely, the first isolation component P1, the second isolation component P2, the third isolation component P3, the fourth isolation component P4, the fifth isolation component P5, the fifth auxiliary isolation component P5b, the fifth secondary auxiliary isolation component P5c, the sixth isolation component P6, the seventh isolation component P7, and the eighth isolation component P8. The first isolator P1 is placed on the image side of the first lens and is at least partially in contact with the image side of the first lens; the second isolator P2 is placed on the image side of the second lens and is at least partially in contact with the image side of the second lens; the third isolator P3 is placed on the image side of the third lens and is at least partially in contact with the image side of the third lens; the fourth isolator P4 is placed on the image side of the fourth lens and is at least partially in contact with the image side of the fourth lens; the fifth isolator P5 is placed on the image side of the fifth lens and is at least partially in contact with the image side of the fifth lens; the fifth auxiliary isolator P5b is placed on the image side of the fifth isolator and is at least partially in contact with the image side of the fifth isolator; the fifth secondary auxiliary isolator P5c is placed on the image side of the fifth auxiliary isolator and is at least partially in contact with the image side of the fifth auxiliary isolator; the sixth isolator P6 is placed on the image side of the sixth lens and is at least partially in contact with the image side of the sixth lens; the seventh isolator P7 is placed on the image side of the seventh lens and is at least partially in contact with the image side of the seventh lens; the eighth isolator P8 is placed on the image side of the eighth lens and is at least partially in contact with the image side of the eighth lens. The aforementioned isolation components can block excess external light from entering, allowing the lens to better support the lens barrel and enhancing the structural stability of optical imaging systems 1001, 1002, and 1003.

[0079] Table 3 shows the basic parameters of the isolation components and lens barrels of the optical imaging systems 1001, 1002 and 1003 of Embodiment 1. The unit of each parameter in Table 3 is millimeters (mm).

[0080] Parameters / Optical Imaging System Optical Imaging System 1001 Optical Imaging System 1002 Optical Imaging System 1003 d1s 4.530 4.531 4.532 d1m 4.486 4.487 4.488 D1s 6.833 8.339 6.177 d2s 4.281 4.273 4.276 d2m 4.237 4.229 4.232 D2s 6.874 8.439 6.211 D2m 6.874 8.439 6.211 d3s 4.440 4.449 4.444 D3s 6.813 8.539 6.160 d4s 5.189 5.095 5.308 D4s 6.893 8.639 7.982 D4m 6.893 8.639 7.982 d5s 5.769 5.763 5.793 D5s 8.739 8.739 9.533 d6m 6.476 6.476 6.476 d7m 9.316 9.316 9.316 D8s 11.170 11.170 11.170 D0s 9.290 9.284 9.278 EP01 1.061 1.060 1.078 EP12 0.377 0.390 0.387 EP34 0.808 0.435 0.551 EP45 0.544 0.577 0.564 d5m 5.725 5.719 5.750 D6m 11.037 11.037 11.037

[0081] Table 3

[0082] Figure 3A The on-axis chromatic aberration curves of optical imaging systems 1001, 1002, and 1003 of Embodiment 1 are shown, which represent the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3B The astigmatism curves of optical imaging systems 1001, 1002, and 1003 of Embodiment 1 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of optical imaging systems 1001, 1002 and 1003 of Embodiment 1 are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curves of optical imaging systems 1001, 1002, and 1003 of Embodiment 1 are shown, which represent the deviations in image height at different points on the imaging plane after light passes through the lens. Figure 3E The relative illumination curves of optical imaging systems 1001, 1002, and 1003 of Embodiment 1 are shown, representing the relative illumination values ​​corresponding to different image heights. According to... Figures 3A to 3E It can be seen that the optical imaging system 1001, optical imaging system 1002 and optical imaging system 1003 given in Example 1 can achieve good imaging quality.

[0083] Example 2

[0084] The following is for reference Figures 4A to 5E The optical imaging system 2001, optical imaging system 2002, and optical imaging system 2003 according to Embodiment 2 of this application are described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figures 4A to 4C Schematic diagrams of the optical imaging system 2001, optical imaging system 2002 and optical imaging system 2003 according to Embodiment 2 of this application are shown respectively.

[0085] like Figures 4A to 4C As shown, optical camera systems 2001, 2002, and 2003 each include a lens barrel P0, lens groups E1 to E8, and multiple isolation components P1 to P8.

[0086] likeFigures 4A to 4C As shown, optical imaging systems 2001, 2002, and 2003 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, a seventh lens E7, and an eighth lens E8. 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. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto imaging surface S17 (not shown).

[0087] In this example, the effective focal length f of optical imaging systems 2001, 2002, and 2003 is 7.50 mm, the combined focal length f12 of the first and second lenses is 15.78 mm, the combined focal length f345 of the third, fourth, and fifth lenses is 15.37 mm, the maximum field of view (FOV) of optical imaging systems 2001, 2002, and 2003 is 80.0°, and the distance TTL on the optical axis from the object side of the first lens of optical imaging systems 2001, 2002, and 2003 is 9.8 mm.

[0088] Table 4 shows the basic parameters of the lens groups of optical imaging systems 2001, 2002, and 2003 in Embodiment 2, wherein the units of radius of curvature, thickness, and effective focal length are millimeters (mm). Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0089]

[0090]

[0091] Table 4

[0092]

[0093] Table 5

[0094] like Figures 4A to 4CAs shown, optical imaging systems 2001, 2002, and 2003 each include 10 isolating components: a first isolating component P1, a second isolating component P2, a third isolating component P3, a fourth isolating component P4, a fifth isolating component P5, a fifth auxiliary isolating component P5b, a fifth secondary auxiliary isolating component P5c, a sixth isolating component P6, a seventh isolating component P7, and an eighth isolating component P8. The positions of these 10 isolating components are the same as those of the 10 isolating components in Embodiment 1, and will not be described again. These isolating components can block excess external light from entering, allowing the lens to better support the lens barrel, and enhancing the structural stability of optical imaging systems 2001, 2002, and 2003.

[0095] Table 6 shows the basic parameters of the isolation components and lens barrels of the optical imaging systems 2001, 2002 and 2003 of Embodiment 2. The unit of each parameter in Table 6 is millimeters (mm).

[0096] Parameters / Optical Imaging System Optical Imaging System 2001 Optical Imaging System 2002 Optical Imaging System 2003 d1s 4.492 4.492 4.495 d1m 4.448 4.448 4.451 D1s 6.794 8.339 6.134 d2s 4.134 4.135 4.135 d2m 4.090 4.091 4.091 D2s 6.727 8.439 6.070 D2m 6.727 8.439 6.070 d3s 4.472 4.465 4.468 D3s 7.045 8.539 6.185 d4s 5.294 5.310 5.452 D4s 7.045 8.639 7.982 D4m 7.045 8.639 7.982 d5s 5.937 5.922 5.920 D5s 8.739 8.739 9.533 d6m 6.463 6.463 6.463 d7m 9.188 9.188 9.188 D8s 11.091 11.091 11.091 D0s 9.282 9.280 9.281 EP01 1.228 1.209 1.205 EP12 0.693 0.690 0.695 EP34 0.537 0.537 0.626 EP45 0.559 0.562 0.467 d5m 5.893 5.878 5.877 D6m 10.958 10.958 10.958

[0097] Table 6

[0098] Figure 5A The on-axis chromatic aberration curves of optical imaging systems 2001, 2002 and 2003 of Embodiment 2 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B Astigmatism curves of optical imaging systems 2001, 2002, and 2003 of Embodiment 2 are shown, representing meridional image plane curvature and sagittal image plane curvature. Figure 5C The distortion curves of optical imaging systems 2001, 2002 and 2003 of Embodiment 2 are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curves of optical imaging systems 2001, 2002, and 2003 of Embodiment 2 are shown, which represent the deviations in image height at different points on the imaging plane after light passes through the lens. Figure 5E The relative illumination curves of optical imaging systems 2001, 2002, and 2003 of Embodiment 2 are shown, representing the relative illumination values ​​corresponding to different image heights. According to... Figures 5A to 5E It can be seen that the optical imaging system 2001, optical imaging system 2002 and optical imaging system 2003 given in Example 2 can achieve good imaging quality.

[0099] Example 3

[0100] The following is for reference Figures 6A to 7EThe optical imaging system 3001, optical imaging system 3002 and optical imaging system 3003 according to Embodiment 3 of this application are described. Figures 6A to 6C Schematic diagrams of the optical imaging system 3001, optical imaging system 3002 and optical imaging system 3003 according to Embodiment 3 of this application are shown respectively.

[0101] like Figures 6A to 6C As shown, optical camera systems 3001, 3002, and 3003 each include a lens barrel P0, lens groups E1 to E8, and multiple isolation components P1 to P8.

[0102] like Figures 6A to 6C As shown, optical imaging systems 3001, 3002, and 3003 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, a seventh lens E7, and an eighth lens E8. 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. The eighth lens E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto imaging surface S17 (not shown).

[0103] In this example, the effective focal length f of optical imaging systems 3001, 3002, and 3003 is 7.50 mm, the combined focal length f12 of the first and second lenses is 14.65 mm, the combined focal length f345 of the third, fourth, and fifth lenses is 17.61 mm, the maximum field of view (FOV) of optical imaging systems 3001, 3002, and 3003 is 80.0°, and the distance TTL on the optical axis from the object side of the first lens of optical imaging systems 3001, 3002, and 3003 is 9.8 mm.

[0104] Table 7 shows the basic parameters of the lens groups of optical imaging systems 3001, 3002, and 3003 in Embodiment 3, wherein the units of radius of curvature, thickness, and effective focal length are millimeters (mm). Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0105]

[0106]

[0107] Table 7

[0108]

[0109] Table 8

[0110] like Figures 6A to 6C As shown, optical imaging systems 3001, 3002, and 3003 each include 10 isolation components: a first isolation component P1, a second isolation component P2, a third isolation component P3, a fourth isolation component P4, a fifth isolation component P5, a fifth auxiliary isolation component P5b, a fifth secondary auxiliary isolation component P5c, a sixth isolation component P6, a seventh isolation component P7, and an eighth isolation component P8. The positions of these 10 isolation components are the same as those of the 10 isolation components in Embodiment 1, and will not be described again. These isolation components can block excess external light from entering, allowing the lens to better support the lens barrel, and enhancing the structural stability of optical imaging systems 3001, 3002, and 3003.

[0111] Table 9 shows the basic parameters of the isolation components and lens barrels of the optical imaging systems 3001, 3002 and 3003 of Embodiment 3. The unit of each parameter in Table 9 is millimeters (mm).

[0112]

[0113]

[0114] Table 9

[0115] Figure 7A The on-axis chromatic aberration curves of optical imaging systems 3001, 3002 and 3003 of Embodiment 3 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curves of optical imaging systems 3001, 3002 and 3003 of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of optical imaging systems 3001, 3002 and 3003 of Embodiment 3 are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curves of optical imaging systems 3001, 3002, and 3003 of Embodiment 3 are shown, which represent the deviations in image height at different points on the imaging plane after light passes through the lens.Figure 7E The relative illumination curves of optical imaging systems 3001, 3002, and 3003 of Embodiment 3 are shown, representing the relative illumination values ​​corresponding to different image heights. According to... Figures 7A to 7E It can be seen that the optical imaging system 3001, optical imaging system 3002 and optical imaging system 3003 given in Example 3 can achieve good imaging quality.

[0116] In summary, the optical imaging systems 1001, 1002, 1003, 2001, 2002, 2003, 3001, 3002, and 3003 of Examples 1 to 3 satisfy the relationships shown in Table 10.

[0117]

[0118]

[0119] Table 10

[0120] 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.

[0121] 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: 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: The first lens with positive refractive power has a convex object side and a concave image side. The second lens with refractive power has a convex object side and a concave image side; The third lens with negative refractive power has a convex object side and a concave image side; The fourth lens, which has positive refractive power, has a convex image side surface. The fifth lens with positive refractive power has a concave object side and a convex image side. The sixth lens, which has positive refractive power, has a convex object side and a convex image side. The seventh lens, possessing positive refractive power, has a convex object side and a concave image side; and The eighth lens, possessing negative refractive power, has a concave object side and a concave image side; and The plurality of isolation members include: a third isolation member disposed on the image side of the third lens and in at least partial contact with the image side surface of the third lens; a fourth isolation member disposed on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth lens; a fifth isolation member disposed on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens; a sixth isolation member disposed on the image side of the sixth lens and in at least partial contact with the image side surface of the sixth lens; and a seventh isolation member disposed on the image side of the seventh lens and in at least partial contact with the image side surface of the seventh lens. The optical imaging system has eight lenses with refractive power. The effective focal length f of the optical imaging system, the inner diameter d6m of the image-side surface of the sixth isolator, the inner diameter d7m of the image-side surface of the seventh isolator, and the maximum field of view (FOV) of the optical imaging system satisfy the following: 4.43≤[f×tan(FOV / 2)] / [(d7m-d6m) / 2]≤4.62; The combined focal length f345 of the third lens, the fourth lens, and the fifth lens, the distance EP34 between the image-side surface of the third isolator and the object-side surface of the fourth isolator along the optical axis, and the distance EP45 between the image-side surface of the fourth isolator and the object-side surface of the fifth isolator along the optical axis satisfy: 13.98≤f345 / (EP34+EP45)≤24.

87.

2. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: 0.92 ≤ Djs / Ri ≤ 2.15, where i = 2j, j = 2, 3, or 8, Ri is the radius of curvature of the image-side surface of the lens with negative refractive power, and Djs is the outer diameter of the object-side surface of the insulating member placed on the image-side surface of the lens with negative refractive power and in at least partial contact with the image-side surface of the lens; wherein, When j is 2, i=4, the second lens has negative refractive power, R4 represents the radius of curvature of the image side of the second lens, and D2s represents the outer diameter of the object side of the second isolator placed on the image side of the second lens and in at least partial contact with the image side of the second lens. When j is 3, i=6, the third lens has negative refractive power, R6 represents the radius of curvature of the image side of the third lens, and D3s represents the outer diameter of the object side of the third isolator placed on the image side of the third lens and in at least partial contact with the image side of the third lens. When j is 8, i=16, the eighth lens has negative refractive power, R16 represents the radius of curvature of the image side of the eighth lens, and D8s represents the outer diameter of the object side of the eighth isolator placed on the image side of the eighth lens and in at least partial contact with the image side of the eighth lens.

3. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies: -80.06 ≤ fk / (dws-dks) ≤ 101.23, k = 2, 3, or 4, w = k-1; where, fk is the effective focal length of the k-th lens, dws is the inner diameter of the object-side surface of the isolator placed on the image side of the (k-1)-th lens and at least partially in contact with the image side of the (k-1)-th lens, and dks is the inner diameter of the object-side surface of the isolator placed on the image side of the k-th lens and at least partially in contact with the image side of the k-th lens; where, When k is 2, w=1, f2 is the effective power of the second lens, d1s is the inner diameter of the object side of the first isolator placed on the image side of the first lens and in at least partial contact with the image side of the first lens, and d2s is the inner diameter of the object side of the second isolator placed on the image side of the second lens and in at least partial contact with the image side of the second lens. When k is 3, w=2, f3 is the effective power of the third lens, d2s is the inner diameter of the object side of the second isolator placed on the image side of the second lens and in at least partial contact with the image side of the second lens, and d3s is the inner diameter of the object side of the third isolator placed on the image side of the third lens and in at least partial contact with the image side of the third lens. When k is 4, w=3, f4 is the effective power of the fourth lens, d3s is the inner diameter of the object side of the third isolator placed on the image side of the third lens and in at least partial contact with the image side of the third lens, and d4s is the inner diameter of the object side of the fourth isolator placed on the image side of the fourth lens and in at least partial contact with the image side of the fourth lens.

4. The optical imaging system according to claim 1, characterized in that, The plurality of isolation components also include: A first isolator is positioned on the image side of the first lens and at least partially contacts the image side surface of the first lens; and The second spacer is placed on the image side of the second lens and is at least partially in contact with the image side of the second lens; in, The combined focal length f12 of the first lens and the second lens, the refractive index N1 of the first lens, the refractive index N2 of the second lens, the distance EP01 from the object-side end face of the lens barrel to the object-side face of the first isolator along the optical axis, and the distance EP12 from the image-side face of the first isolator to the object-side face of the second isolator along the optical axis satisfy: 23.63≤f12×(N1+N2) / (EP01+EP12)≤27.

48.

5. The optical imaging system according to claim 1, characterized in that, The plurality of isolation components also include: A first isolator is positioned on the image side of the first lens and at least partially contacts the image side surface of the first lens; and The second spacer is placed on the image side of the second lens and is at least partially in contact with the image side of the second lens; in, The dispersion coefficient V1 of the first lens, the dispersion coefficient V2 of the second lens, the distance EP12 between the image side of the first isolator and the object side of the second isolator along the optical axis, and the center thickness CT1 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy: 41.61≤(V1+V2)×EP12 / (CT1+CT2)≤44.

39.

6. The optical imaging system according to claim 1, characterized in that, The plurality of isolation components also include: A first isolator is positioned on the image side of the first lens and at least partially contacts the image side surface of the first lens; and The second spacer is placed on the image side of the second lens and is at least partially in contact with the image side of the second lens; in, The radius of curvature R3 of the object side of the second lens, the inner diameter d1m of the image side of the first isolator, the air gap T12 between the first lens and the second lens on the optical axis, and the distance EP12 between the image side of the first isolator and the object side of the second isolator along the optical axis satisfy: 24.74≤(R3+d1m) / (T12+EP12)≤34.

39.

7. The optical imaging system according to claim 1, characterized in that, The air gap T34 between the second and fourth lenses on the optical axis, the air gap T45 between the fourth and fifth lenses on the optical axis, 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 CT4 of the fourth lens on the optical axis, the dispersion coefficient V4 of the fourth lens and the refractive index N4 of the fourth lens satisfy: 6.13≤(T34+T45)×V4 / [(CT4+EP34)×N4]≤8.

20.

8. The optical imaging system according to claim 1, characterized in that, The plurality of isolation components also include: A first isolating member is positioned on the image side of the first lens and at least partially contacts the image side surface of the first lens; wherein, 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 effective focal length f1 of the first lens, and the distance EP01 from the object side end face of the lens barrel to the object side surface of the first isolator along the optical axis satisfy: 0.49≤(R1+R2) / (f1+EP01)≤6.

83.

9. The optical imaging system according to claim 1, characterized in that, The plurality of isolation components also include: The second spacer is placed on the image side of the second lens and is at least partially in contact with the image side of the second lens; The radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, the inner diameter d2m of the image side surface of the second isolator, the outer diameter D2m of the image side surface of the second isolator, the inner diameter d3s of the object side surface of the third isolator, and the outer diameter D3s of the object side surface of the third isolator satisfy the following: 3.29≤R5 / (D2m-d2m)+R6 / (D3s-d3s)≤7.

85.

10. The optical imaging system according to claim 1, characterized in that, The radius of curvature R8 of the image side of the fourth lens, the radius of curvature R10 of the image side of the fifth lens, the outer diameter D4s of the object side of the fourth spacer, and the outer diameter D5s of the object side of the fifth spacer satisfy: -2.70 ≤ (R8 + R10) / D4s + (R8 - R10) / D5s ≤ -1.

42.

11. The optical imaging system according to any one of claims 1-9, characterized in that, The radius of curvature R9 of the object side of the fifth lens, the radius of curvature R10 of the image side of the fifth lens, and the inner diameter d5s of the object side of the fifth spacer satisfy: R9 < R10 < 0 and -8.76 ≤ (R9 - R10) / d5s ≤ -1.

35.

12. The optical imaging system according to claim 1, characterized in that, The plurality of spacers further includes: A first spacer disposed on the image side of the first lens and at least partially contacting 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 outer diameter D1s of the object side of the first spacer, and the outer diameter D0s of the object side end face of the lens barrel satisfy: 0.55 ≤ (R1 + R2) / (D1s + D0s) ≤ 3.

96.

13. The optical imaging system according to any one of claims 1-10, characterized in that, The effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens, the effective focal length f7 of the seventh lens, and the effective focal length f of the optical imaging system satisfy: 3.80 ≤ f5 / f ≤ 11.98, 1.41 ≤ f6 / f ≤ 1.62, and 2.64 ≤ f7 / f ≤ 4.

12.

14. The optical imaging system according to any one of claims 1-10, characterized in that, The optical imaging system satisfies: 1.63 ≤ fk / dkm ≤ 15.55, k = 5, 6, or 7; Where fk is the effective focal length of the k-th lens, and dkm is the inner diameter of the image side of the spacer disposed on the image side of the k-th lens and at least partially contacting the image side of the k-th lens; When k = 5, f5 is the effective focal length of the fifth lens, and d5m is the inner diameter of the image side of the fifth spacer disposed on the image side of the fifth lens and at least partially contacting the image side of the fifth lens; When k = 6, f6 is the effective focal length of the sixth lens, and d6m is the inner diameter of the image side of the sixth spacer disposed on the image side of the sixth lens and at least partially contacting the image side of the sixth lens; When k = 7, f7 is the effective focal length of the seventh lens, and d7m is the inner diameter of the image side of the seventh spacer disposed on the image side of the seventh lens and at least partially contacting the image side of the seventh lens.

15. The optical imaging system according to claim 1, characterized in that, 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 outer diameter D6m of the image side of the sixth spacer, and the inner diameter d6m of the image side of the sixth spacer satisfy: -15.86 ≤ (R11 + R12) / (D6m - d6m) ≤ -2.

74.

16. The optical imaging system according to any one of claims 1-10, characterized in that, The curvature radius R3 of the object side of the second lens, the curvature radius R4 of the image side of the second lens, the curvature radius R5 of the object side of the third lens, the curvature radius R6 of the image side of the third lens, and the curvature radius R8 of the image side of the fourth lens satisfy the following conditions: R3>0, R5>0, 0.49≤R3 / R4≤3.13, 1.43≤R5 / R6≤2.30, and -0.95≤R6 / R8≤-0.51.

Images