Optical camera system

Abstract

The present application discloses an optical imaging system, which sequentially 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 from the object side to the image side along the optical axis; the first lens, the fifth lens, the sixth lens and the eighth lens have negative optical powers, and the second lens, the third lens, the fourth lens and the seventh lens have positive optical powers; at least two lenses among the first lens to the eighth lens are free-form lenses; 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, the central thickness CT5 of the fifth lens on the optical axis, the effective focal length f5 of the fifth lens and the total effective focal length f of the optical imaging system satisfy -2.0 < [(R9 - R10) / CT5] / (f5 / f) < 0, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy 2.0 < f / EPD < 3.0, and the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy 3.0 < CT7 / CT8 < 5.0.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an eight-lens optical imaging system. Background Art

[0002] In recent years, with the rapid development of portable electronic products such as smart phones, higher requirements have been put forward for the shooting effects of smart phones. For example, in order to shoot farther scenes, a telephoto lens is required; in order to shoot the characteristics of plants and flowers, a macro lens is required; and in order to shoot more scenes, a wide-angle lens is required, etc.

[0003] However, the aspect ratio of the wide-angle lens used in existing smart phones is small, and the shooting field range is small, which cannot better meet the shooting requirements for movie effects and more scene intake. Moreover, the unreasonable design of the lens in the sensitive position will also affect the imaging quality of the entire wide-angle lens. Summary of the Invention

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

[0005] On the one hand, this application provides such an optical imaging system, which sequentially 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 along the optical axis from the object side to the image side; the first lens, the fifth lens, the sixth lens, and the eighth lens have negative optical powers, and the second lens, the third lens, the fourth lens, and the seventh lens have positive optical powers; the distance from the center of the effective diameter part of the object side surface of the fifth lens to the imaging surface along the optical axis is less than the distance from the edge of the effective diameter part of the object side surface of the fifth lens to the imaging surface along the optical axis; at least two of the first lens to the eighth lens are free-form surface lenses; 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, the central thickness CT5 of the fifth lens on the optical axis, the effective focal length f5 of the fifth lens, and the total effective focal length f of the optical imaging system satisfy -2.0 < [(R9 - R10) / CT5] / (f5 / f) < 0, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy 2.0 < f / EPD < 3.0, and the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy 3.0 < CT7 / CT8 < 5.0.

[0006] According to an exemplary embodiment of this application, the maximum effective semi-aperture DT31 of the object side surface of the third lens, the central thickness CT3 of the third lens on the optical axis, the effective focal length f3 of the third lens, and the radius of curvature R5 of the object side surface of the third lens satisfy 0.5 < (DT31 / CT3) / (f3 / R5) < 1.5.

[0007] According to an exemplary embodiment of the present application, the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens and the total effective focal length f of the optical camera system meet 0.1 mm. -2 <[(R7-R8) / (R7+R8)] / (f4×f)<1.5mm -2 .

[0008] According to an exemplary embodiment of the present application, a center thickness CT3 of the third lens on the optical axis, a center thickness CT4 of the fourth lens on the optical axis, a center thickness CT5 of the fifth lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and a combined focal length f3456 of the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy 0.1<(CT3+CT4+CT5+CT6) / f3456<1.0.

[0009] According to an exemplary embodiment of the present application, the combined focal length f12 of the first lens and the second lens and the combined focal length f78 of the seventh lens and the eighth lens satisfy −2.0 <f12 / f78<-0.5。

[0010] According to an exemplary embodiment of the present application, the maximum effective semi-aperture DT51 of the object-side surface of the fifth lens, the edge thickness ET5 of the fifth lens, the maximum effective semi-aperture DT61 of the object-side surface of the sixth lens, the edge thickness ET6 of the sixth lens, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the center thickness CT5 of the fifth lens on the optical axis and the center thickness CT6 of the sixth lens on the optical axis satisfy 0<(DT51 / ET5+DT61 / ET6)×[T56 / (CT5+CT6)]<2.0.

[0011] According to an exemplary embodiment of the present application, a curvature radius R9 of the object-side surface of the fifth lens, a curvature radius R10 of the image-side surface of the fifth lens, and an effective focal length f5 of the fifth lens satisfy 0<(R9+R10) / f5<1.0.

[0012] According to an exemplary embodiment of the present application, the air interval T56 between the fifth lens and the sixth lens on the optical axis, the air interval T67 between the sixth lens and the seventh lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the effective focal length f6 of the sixth lens satisfy -2.0<(T56+CT6+T67)×10 / f6<0.

[0013] According to an exemplary embodiment of the present application, a curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens satisfy 0.2<(R11-R12) / (R11+R12)<1.5.

[0014] According to an exemplary embodiment of the present application, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, and the air interval T23 between the second lens and the third lens on the optical axis satisfy 3.0 <CT1 / T12+CT2 / T23<4.5。

[0015] According to an exemplary embodiment of the present application, the image height ImgHx of the optical camera system in the X-axis direction satisfies ImgHx>1.5mm, and the image height ImgHy of the optical camera system in the Y-axis direction satisfies ImgHy<3.0mm.

[0016] According to an exemplary embodiment of the present application, the half field angle Semi-FOVx of the optical camera system in the X-axis direction satisfies Semi-FOVx>30.0°, and the half field angle Semi-FOVy of the optical camera system in the Y-axis direction satisfies Semi-FOVy>45.0°.

[0017] According to an exemplary embodiment of the present application, the object-side surface of the third lens is a convex surface, and both the object-side surface and the image-side surface of the fourth lens are convex surfaces.

[0018] According to an exemplary embodiment of the present application, the object-side surface of the fifth lens is concave, the image-side surface of the fifth lens is convex, and the image-side surface of the sixth lens is concave.

[0019] According to an exemplary embodiment of the present application, the first lens, the second lens, the seventh lens, and the eighth lens are free-form surface lenses.

[0020] The present application uses a design of multiple free-form surface lenses in an optical camera system, and by reasonably allocating the optical focal length of each lens and optimizing the optical parameters, the optical camera system can achieve wide-frame imaging and have a larger field of view, which can obtain a wider framing effect. At the same time, reasonable control of the degree of curvature of the sensitive lens helps to have a higher ability to correct the focal length, reduce the sensitivity of the optical camera system, and improve the processability of the optical camera system. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 1 Schematic diagram of the structure of an optical camera system according to Example 1 of the present application is shown;

[0023] Figures 2A to 2C axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Example 1 of the present application are respectively shown;

[0024] Figure 3 Schematic diagram of the structure of an optical camera system according to embodiment 2 of the present application is shown;

[0025] Figures 4A to 4C axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Example 2 of the present application are respectively shown;

[0026] Figure 5 Schematic diagram of the structure of an optical camera system according to Example 3 of the present application is shown;

[0027] Figures 6A to 6C axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Example 3 of the present application are respectively shown;

[0028] Figure 7 Schematic diagram of the structure of an optical camera system according to Example 4 of the present application is shown;

[0029] Figures 8A to 8C axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Example 4 of the present application are respectively shown;

[0030] Figure 9 Schematic diagram of the structure of an optical camera system according to Example 5 of the present application is shown;

[0031] Figures 10A to 10C axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Example 5 of the present application are respectively shown;

[0032] Figure 11 Schematic diagram of the structure of an optical camera system according to Example 6 of the present application is shown;

[0033] 12A to 12C axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging system according to Example 6 of the present application are respectively shown;

[0034] Figure 13 shows a schematic structural diagram of an optical camera system according to embodiment 7 of the present application; and

[0035] 14A to 14C The axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical camera system according to Example 7 of the present application are respectively shown. DETAILED DESCRIPTION

[0036] In order to better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0037] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0038] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0039] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, 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.

[0040] In this article, we define the direction parallel to the optical axis as the Z-axis direction, the direction perpendicular to the Z-axis and located in the meridional plane as the Y-axis direction, and the direction perpendicular to the Z-axis and located in the sagittal plane as the X-axis direction. Unless otherwise specified, all parameter symbols in this article (for example, optical power, etc.) except for the parameter symbols related to the field of view represent the characteristic parameter values ​​along the Y-axis direction of the optical camera system. For example, unless otherwise specified, ImgHx represents the image height of the optical camera system in the X-axis direction, ImgHy represents the image height of the optical camera system in the Y-axis direction, and f represents the total effective focal length of the optical camera system in the Y-axis direction.

[0041] It should also be understood that the terms "comprise," "including," "having," "include," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when describing embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application." Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0042] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0043] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] The features, principles and other aspects of the present application are described in detail below.

[0045] An optical imaging system according to an exemplary embodiment of the present application may include eight lenses having optical power, namely, 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. These eight lenses are arranged sequentially along the optical axis from the object side to the image side. Among the first through eighth lenses, any two adjacent lenses may have an air gap between them.

[0046] In example embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens may each have positive or negative power.

[0047] In an exemplary embodiment, the first lens may have negative optical power, the second lens may have positive optical power, the seventh lens may have positive optical power, and the eighth lens may have negative optical power. By controlling the distribution of optical power between the first and second lenses, the imaging quality of the optical camera system can be effectively guaranteed. By controlling the distribution of optical power between the seventh and eighth lenses, the focal length ratio of the optical camera system in the X-axis and Y-axis directions can be effectively guaranteed without affecting the sensitivity of the optical camera system.

[0048] In an exemplary embodiment, two of the third through sixth lenses may have positive optical power, and at least one of the third through sixth lenses may have a convex object-side surface. By controlling the surface profile and optical power of the third through sixth lenses, the optical camera system can achieve a wide-angle effect, with a full field of view (FOV) greater than 100°, facilitating a wider viewing experience.

[0049] In an exemplary embodiment, the third lens may have positive optical power and a convex object-side surface; the fourth lens may have positive optical power, a convex object-side surface, and a convex image-side surface. By controlling the optical power of the third and fourth lenses, the shape of the fourth lens can be effectively controlled, thereby controlling the contribution of the fourth lens to the system's spherical aberration, resulting in better image quality in the optical camera system's paraxial field of view.

[0050] In an exemplary embodiment, the fifth lens may have negative power, with its object-side surface concave and its image-side surface convex. The sixth lens may also have negative power, with its image-side surface concave. By controlling the power of the fifth and sixth lenses, the shape of the sixth lens can be effectively controlled, thereby controlling its contribution to the system's spherical aberration, resulting in better image quality within the optical camera system's paraxial field of view. By making the image-side surface of the fifth lens convex, the trajectory of light can be effectively controlled, ensuring that the angle of light emitted from the optical camera system better matches the chip.

[0051] In an exemplary embodiment, at least two of the first through eighth lenses are free-form surface lenses. By utilizing multiple free-form surface lenses in an optical camera system, the optical camera system can have different focal length ratios in the X / Y axis directions, and the ratios can be sufficiently large. This means that the optical camera system has different magnifications in the X and Y axes, facilitating wide-frame imaging.

[0052] In an exemplary embodiment, the first, second, seventh, and eighth lenses are free-form surface lenses. By controlling the first, second, seventh, and eighth lenses to be free-form surface lenses, the optical camera system can be configured with different focal length ratios along the X / Y axes, thereby achieving wide-frame imaging effects.

[0053] In an exemplary embodiment, the distance from the center of the object-side effective diameter portion of the fifth lens element to the imaging plane along the optical axis is shorter than the distance from the edge of the object-side effective diameter portion of the fifth lens element to the imaging plane along the optical axis. In other words, the object-side surface of the fifth lens element is concave. By making the object-side surface of the fifth lens element concave, the fifth lens element can achieve a higher focus correction capability, ensuring lower sensitivity before and after the aperture stop, and better compatibility with manufacturing capabilities. The object-side effective diameter portion of the fifth lens element refers to the portion of the object-side surface of the fifth lens element that effectively transmits light.

[0054] In an exemplary embodiment, 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, the central thickness CT5 of the fifth lens on the optical axis, the effective focal length f5 of the fifth lens, and the total effective focal length f of the optical imaging system satisfy -2.0 < [(R9 - R10) / CT5] / (f5 / f) < 0. In an example, -1.30 < [(R9 - R10) / CT5] / (f5 / f) < -0.50. By reasonably controlling the interrelationship among the radius of curvature of the object side surface of the fifth lens, the radius of curvature of the image side surface of the fifth lens, the central thickness of the fifth lens on the optical axis, the effective focal length of the fifth lens, and the total effective focal length of the optical imaging system, the shape of the fifth lens can be effectively controlled, enabling the fifth lens to converge light rays and control the light ray trend. At the same time, the fifth lens has a sufficient central thickness, ensuring that the optical imaging system has good processability.

[0055] In an exemplary embodiment, the total effective focal length f of the optical imaging system and the entrance pupil diameter EPD of the optical imaging system satisfy 2.0 < f / EPD < 3.0. By reasonably controlling the interrelationship among the total effective focal lengths in the X-axis direction and Y-axis direction of the optical imaging system and the entrance pupil diameter, it can be ensured that the optical imaging system has sufficient light transmittance.

[0056] In an exemplary embodiment, the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT8 of the eighth lens on the optical axis satisfy 3.0 < CT7 / CT8 < 5.0. In an example, 3.1 < CT7 / CT8 < 4.5. By reasonably controlling the interrelationship between the central thickness of the seventh lens on the optical axis and the central thickness of the eighth lens on the optical axis, it can be ensured that the seventh lens and the eighth lens have good processability, and can effectively control the influence of the subsequent optical elements on the field curvature of the system, enabling the optical imaging system to have better image quality.

[0057] In an exemplary embodiment, the image height ImgHx of the optical imaging system in the X-axis direction satisfies ImgHx > 1.5 mm, and the image height ImgHy of the optical imaging system in the Y-axis direction satisfies ImgHy < 3.0 mm. In an example, 1.6 mm < ImgHx < 2 mm, and  2.1 mm < ImgHy < 2.6 mm. By reasonably controlling the image heights of the optical imaging system in the X-axis direction and Y-axis direction, the size of the entire optical imaging system can be effectively compressed, ensuring that the optical imaging system is compact, which is conducive to meeting the processing and installation requirements.

[0058] In an exemplary embodiment, the semi-field angle Semi-FOVx of the optical imaging system in the X-axis direction satisfies Semi-FOVx > 30.0°, and the semi-field angle Semi-FOVy of the optical imaging system in the Y-axis direction satisfies Semi-FOVy > 45.0°. In an example, 39.7° < Semi-FOVx < 47.0° and 50.0° < Semi-FOVy < 66.0°. By reasonably controlling the semi-field angles of the optical imaging system in the X-axis direction and the Y-axis direction, the imaging field of view range of the optical imaging system can be ensured, enabling the optical imaging system to have a large field of view range.

[0059] In an exemplary embodiment, the maximum effective semi-aperture DT31 of the object side surface of the third lens, the central thickness CT3 of the third lens on the optical axis, the effective focal length f3 of the third lens, and the curvature radius R5 of the object side surface of the third lens satisfy 0.5 < (DT31 / CT3) / (f3 / R5) < 1.5. In an example, 0.70 < (DT31 / CT3) / (f3 / R5) < 1.30. By reasonably controlling the mutual relationship between the maximum effective semi-aperture of the third lens, the central thickness of the third lens on the optical axis, the effective focal length of the third lens, and the curvature radius of the object side surface of the third lens, the light transmission amount of the optical imaging system can be effectively increased, and the relative illuminance of the marginal field of view of the optical imaging system can be improved, enabling the optical imaging system to have good imaging quality in a relatively dark environment.

[0060] In an exemplary embodiment, the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens, and the total effective focal length f of the optical imaging system satisfy 0.1mm -2 <[(R7 - R8) / (R7 + R8)] / (f4 × f) < 1.5mm -2 . For example, 0.15mm [[ID=​​​​​In an exemplary embodiment, the central thickness CT3 of the third lens on the optical axis, the central thickness CT4 of the fourth lens on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, the central thickness CT6 of the sixth lens on the optical axis, and the combined focal length f3456 of the third, fourth, fifth, and sixth lenses satisfy 0.1 < (CT3 + CT4 + CT5 + CT6) / f3456 < 1.0. In an example, 0.3 < (CT3 + CT4 + CT5 + CT6) / f3456 < 0.5. By reasonably controlling the relationship between the central thicknesses of the third, fourth, fifth, and sixth lenses on the optical axis and the combined focal length of the third, fourth, fifth, and sixth lenses, the shapes of the third, fourth, fifth, and sixth lenses can be effectively controlled, ensuring good processability of the third to sixth lenses, facilitating injection molding, and at the same time being able to effectively control the trend of marginal rays and ensure the image quality of the marginal field of view of the optical imaging system.

[0062] In an exemplary embodiment, the combined focal length f12 of the first and second lenses and the combined focal length f78 of the seventh and eighth lenses satisfy -2.0 < f12 / f78 < -0.5. In an example, -2.0 < f12 / f78 < -1.5. By reasonably controlling the relationship between the combined focal length of the first and second lenses and the combined focal length of the seventh and eighth lenses, the optical imaging system can achieve the characteristic of being ultra-thin, which is beneficial for the optical imaging system to be applicable to an ultra-thin lens field of view.

[0063] In an exemplary embodiment, the maximum effective semi-aperture DT51 of the object side of the fifth lens, the edge thickness ET5 of the fifth lens, the maximum effective semi-aperture DT61 of the object side of the sixth lens, the edge thickness ET6 of the sixth lens, the air gap T56 between the fifth and sixth lenses on the optical axis, the central thickness CT5 of the fifth lens on the optical axis, and the central thickness CT6 of the sixth lens on the optical axis satisfy 0 < (DT51 / ET5 + DT61 / ET6) × [T56 / (CT5 + CT6)] < 2.0. In an example, 0.3 < (DT51 / ET5 + DT61 / ET6) × [T56 / (CT5 + CT6)] < 1.65. By constraining the above conditional formula, the deflection angle of the off-axis field rays here can be controlled, effectively reducing the sensitivity of the entire optical imaging system, thereby improving the production yield of the optical imaging system.

[0064] In an exemplary embodiment, 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 effective focal length f5 of the fifth lens satisfy 0<(R9+R10) / f5<1.0. In an example, 0.40<(R9+R10) / f5<0.75. Reasonable control of the relationship between the radius of curvature of the object-side surface of the fifth lens, the radius of curvature of the image-side surface of the fifth lens, and the effective focal length of the fifth lens can effectively control the shape of the fifth lens, and thus control the refraction angle of light through the fourth and sixth lenses, which is beneficial for sharing the large object-side field of view and can effectively correct the off-axis aberrations of the subsequent lens group, thereby improving the imaging quality of the entire optical camera system.

[0065] In an exemplary embodiment, the air spacing T56 between the fifth and sixth lenses, the air spacing T67 between the sixth and seventh lenses, the center thickness CT6 of the sixth lens on the optical axis, and the effective focal length f6 of the sixth lens satisfy the following relationship: -2.0 < (T56 + CT6 + T67) × 10 / f6 < 0. For example, -1.60 < (T56 + CT6 + T67) × 10 / f6 < -0.5. Properly controlling the relationship between the air spacing T56 between the fifth and sixth lenses, the air spacing T67 between the sixth and seventh lenses, the center thickness CT6 of the sixth lens on the optical axis, and the effective focal length of the sixth lens effectively controls the shapes of the fourth and fifth lenses, converges light, and controls the light distribution. This ensures that the optical camera system maintains good optical distortion even when the focal lengths of the optical camera system differ in the X-axis and Y-axis directions.

[0066] In an exemplary embodiment, the radius of curvature R11 of the object-side surface of the sixth lens and the radius of curvature R12 of the image-side surface of the sixth lens satisfy 0.2 < (R11 - R12) / (R11 + R12) < 1.5. In an example, 0.4 < (R11 - R12) / (R11 + R12) < 1.1. Properly controlling the radius of curvature of the object-side surface of the sixth lens and the radius of curvature of the image-side surface of the sixth lens can effectively control the shape of the sixth lens, and thus the refraction angle of light, so that the exit angle of light after passing through the optical camera system better matches the chip.

[0067] In an exemplary embodiment, the central thickness CT1 of the first lens on the optical axis, the central thickness CT2 of the second lens on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy 3.0 < CT1 / T12 + CT2 / T23 < 4.5. In an example, 3.5 < CT1 / T12 + CT2 / T23 < 4.0. By reasonably controlling the interrelationship among the central thickness of the first lens on the optical axis, the central thickness of the second lens on the optical axis, the air gap between the first lens and the second lens on the optical axis, and the air gap between the second lens and the third lens on the optical axis, the sensitivity of the optical imaging system can be effectively reduced, the yield rate of the optical imaging system can be improved, and good processability of the optical imaging system can be ensured.

[0068] The optical imaging system according to the above embodiment of the present application may employ multiple lenses, such as the eight lenses described above. By reasonably distributing the optical power, surface shape, central thickness of each lens, and the axial spacing between each lens, etc., the volume of the optical imaging system can be effectively reduced, the sensitivity of the optical imaging system can be reduced, and the processability of the optical imaging system can be improved.

[0069] In an embodiment of the present application, at least one of the mirror surfaces of each lens from the first lens to the eighth lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, the object side and the image side of each of the third lens to the sixth lens are both aspherical mirror surfaces.

[0070] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the optical imaging system can be changed to obtain the various results and advantages described in this specification. For example, although eight lenses are described as an example in the embodiment, the optical imaging system is not limited to including eight lenses. If necessary, the optical imaging system may further include other numbers of lenses.

[0071] The following further describes specific embodiments of the optical imaging system applicable to the above embodiments with reference to the accompanying drawings.

[0072] Example 1

[0073] The following refers to Figures 1 to 2C Describe the optical imaging system according to Embodiment 1 of the present application. Figure 1A structural schematic diagram of an optical camera system according to Example 1 of the present application is shown.

[0074] like Figure 1 As shown, the optical camera system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0075] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0076] Table 1 shows basic parameters of the optical imaging system of Example 1, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0077]

[0078]

[0079] Table 1

[0080] In this embodiment, the total effective focal length f of the optical camera system is 1.92 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 7.64 mm, the image height ImgHx of the optical camera system in the X-axis direction is 1.86 mm, the image height ImgHy of the optical camera system in the Y-axis direction is 2.48 mm, the half field of view Semi-FOVx of the optical camera system in the X-axis direction is 42.3°, and the half field of view Semi-FOVy of the optical camera system in the Y-axis direction is 53°.

[0081] In Example 1, the object-side surface and the image-side surface of any lens among the third lens E3 to the sixth lens E6 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0082]

[0083] Wherein, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Tables 2-1 and 2-2 give the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A80, A81, A9, A10, A11, A12, A13, A14, A15 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0084] Face number A4 A6 A8 A10 A12 A14 A16 S5 2.2798E-02 -6.7176E-03 4.7223E-04 8.2367E-04 1.8764E-04 -3.2006E-05 -6.8667E-05 S6 -1.1732E-02 -3.0096E-04 6.6052E-04 -1.6704E-04 8.7244E-05 -6.8493E-05 5.8527E-05 S7 -1.3050E-02 2.4598E-04 -8.3717E-05 1.0911E-04 -3.9966E-06 5.7101E-05 -1.0349E-05 S8 -9.6845E-02 -4.8190E-03 9.5223E-04 7.0591E-04 6.6688E-04 7.9455E-05 4.9379E-05 S9 -9.6845E-02 -4.8190E-03 9.5223E-04 7.0591E-04 6.6688E-04 7.9455E-05 4.9379E-05 S10 7.3540E-02 -8.3018E-03 1.3277E-02 -5.8097E-03 3.0609E-03 -1.6548E-03 5.0658E-04 S11 7.3540E-02 -8.3018E-03 1.3277E-02 -5.8097E-03 3.0609E-03 -1.6548E-03 5.0658E-04 S12 -7.3714E-01 4.7228E-02 -2.1928E-02 -2.9706E-04 -1.4859E-03 5.6143E-04 9.7071E-04

[0085] Table 2-1

[0086] Face number A18 A20 A22 A24 A26 A28 A30 S5 9.2197E-06 -2.9889E-05 -2.6108E-05 -2.5133E-05 -7.1594E-06 -9.6840E-06 0.0000E+00 S6 -1.5167E-05 2.1039E-05 -2.2324E-05 5.0704E-06 -1.3150E-05 0.0000E+00 0.0000E+00 S7 2.1064E-05 -1.3561E-05 4.3263E-06 -5.1711E-06 3.3741E-06 -1.0639E-06 0.0000E+00 S8 -1.6606E-05 2.0922E-06 -2.6259E-05 -4.2052E-06 -5.3306E-06 0.0000E+00 0.0000E+00 S9 -1.6606E-05 2.0922E-06 -2.6259E-05 -4.2052E-06 -5.3306E-06 0.0000E+00 0.0000E+00 S10 -3.4377E-04 1.1341E-04 2.1880E-06 2.2090E-05 -4.0205E-05 1.1490E-05 7.9812E-07 S11 -3.4377E-04 1.1341E-04 2.1880E-06 2.2090E-05 -4.0205E-05 1.1490E-05 7.9812E-07 S12 -8.3676E-04 2.6546E-04 -1.6469E-05 1.2326E-04 -6.5534E-05 2.3973E-05 -3.3791E-05

[0087] Table 2-2

[0088] In Example 1, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the seventh lens E7, and the eighth lens E8 are all Q2D free-form surfaces. The surface shape of the Q2D free-form surface can be defined by, but is not limited to, the following Q2D free-form surface equation:

[0089]

[0090] The above formula (2) includes the off-axis cone base plus the additional Q-free polynomial deviation. The variables with a tilde (~) represent parameters in the off-axis coordinate system. The specific meanings of the parameters in formula (2) are as follows:

[0091] It represents the total sag of a specific coordinate origin on the conical base of the lens along the normal direction of the surface. The coordinate origin can be moved based on the conical base in the YZ plane.

[0092] Indicates the coordinates of a point on the surface in the cylindrical coordinate system under the off-axis coordinate system;

[0093] Indicates the coordinates of a point on the surface in Cartesian coordinates in the off-axis coordinate system. For a given

[0094] is a variable, which represents the normalized radius r in the off-axis coordinate system norm , the radial distance of the increased aspheric surface from the center, express The offset,

[0095] represents the sagittal height of the lens cone base in the normal direction of the specific coordinate point as described above;

[0096] Indicates the incremental deviation of the sag of the cone base at the coordinate origin along the surface normal direction.

[0097] Figure 2A The axial chromatic aberration curve of the optical imaging system of Example 1 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging system. Figure 2B The astigmatism curve of the optical imaging system of Example 1 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different field angles. Figure 2C The distortion curve of the optical camera system of Example 1 is shown, which represents the distortion value corresponding to different field angles. Figures 2A to 2C It can be seen that the optical camera system provided in Example 1 can achieve good imaging quality.

[0098] Example 2

[0099] The following reference Figures 3 to 4C An optical imaging system according to Embodiment 2 of the present application will be described. Figure 3 A structural schematic diagram of an optical camera system according to Example 2 of the present application is shown.

[0100] like Figure 3 As shown, the optical camera system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0101] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0102] Table 3 shows basic parameters of the optical imaging system of Example 2, wherein the units of curvature radius, thickness / distance and focal length are all millimeters (mm).

[0103]

[0104] Table 3

[0105] In this embodiment, the total effective focal length f of the optical camera system is 1.55 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 6.90 mm, the image height ImgHx of the optical camera system in the X-axis direction is 1.86 mm, the image height ImgHy of the optical camera system in the Y-axis direction is 2.48 mm, the half field of view Semi-FOVx of the optical camera system in the X-axis direction is 41.0°, and the half field of view Semi-FOVy of the optical camera system in the Y-axis direction is 64.5°.

[0106] In Example 2, the object side surface and the image side surface of any lens from the third lens E3 to the sixth lens E6 are both aspherical. Tables 4-1 and 4-2 list the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A64, A59, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A61, A5 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0107] Face number A4 A6 A8 A10 A12 A14 A16 S5 2.3650E-02 -7.0966E-03 5.3952E-04 8.7318E-04 1.2242E-04 -5.2361E-05 -5.9185E-06 S6 -1.6500E-02 1.2462E-03 1.3716E-04 1.4915E-05 -3.2210E-05 1.6100E-05 2.4495E-05 S7 -1.3955E-02 2.0248E-04 -1.0487E-04 7.7901E-05 7.4283E-05 3.2190E-05 7.5836E-06 S8 -1.0881E-01 -3.1256E-03 -7.5555E-05 1.0484E-03 5.3162E-04 1.3984E-04 6.0130E-05 S9 -1.1043E-01 -5.0857E-03 1.0396E-03 6.1054E-04 6.5337E-04 -2.2650E-04 -1.5625E-04 S10 5.9850E-02 -5.4245E-03 1.2009E-02 -5.1453E-03 2.5767E-03 -1.2115E-03 1.3316E-04 S11 -2.0236E-01 -4.4702E-02 2.3993E-03 -1.1133E-02 2.7354E-03 -1.2855E-03 9.5695E-04 S12 -8.0031E-01 6.3122E-02 -2.8966E-02 3.3311E-03 -3.5818E-03 1.6938E-03 3.6479E-04

[0108] Table 4-1

[0109]

[0110]

[0111] Table 4-2

[0112] In Example 2, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the seventh lens E7 and the eighth lens E8 are all Q2D free-form surfaces.

[0113] Figure 4A The axial chromatic aberration curve of the optical imaging system of Example 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging system. Figure 4B The astigmatism curve of the optical imaging system of Example 2 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different field angles. Figure 4C The distortion curve of the optical camera system of Example 2 is shown, which represents the distortion value corresponding to different field angles. Figures 4A to 4C It can be seen that the optical camera system provided in Example 2 can achieve good imaging quality.

[0114] Example 3

[0115] The following reference Figures 5 to 6C An optical imaging system according to Embodiment 3 of the present application will be described. Figure 5 A structural schematic diagram of an optical camera system according to Example 3 of the present application is shown.

[0116] like Figure 5 As shown, the optical camera system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0117] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0118] Table 5 shows the basic parameters of the optical camera system of Example 3, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0119]

[0120]

[0121] Table 5

[0122] In this embodiment, the total effective focal length f of the optical camera system is 1.47 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 7.51 mm, the image height ImgHx of the optical camera system in the X-axis direction is 1.80 mm, the image height ImgHy of the optical camera system in the Y-axis direction is 2.48 mm, the half field of view Semi-FOVx of the optical camera system in the X-axis direction is 45.8°, and the half field of view Semi-FOVy of the optical camera system in the Y-axis direction is 59.51°.

[0123] In Example 3, the object side surface and the image side surface of any lens from the third lens E3 to the sixth lens E6 are aspherical surfaces. Tables 6-1 and 6-2 list the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A64, A59, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A61, A5 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0124] Face number A4 A6 A8 A10 A12 A14 A16 S5 2.9895E-02 -8.1337E-03 8.1896E-04 7.9874E-04 1.7561E-04 -5.3235E-05 -2.5606E-05 S6 -1.9940E-02 1.2533E-03 1.8000E-04 7.3253E-05 -2.4987E-05 -2.3516E-05 2.1514E-05 S7 -1.5410E-02 3.7480E-04 2.2599E-05 1.1306E-05 4.5657E-05 3.6625E-05 2.4704E-05 S8 -1.1742E-01 -3.2753E-03 1.4405E-05 1.0933E-03 5.3973E-04 1.8394E-04 3.2349E-05 S9 -1.1657E-01 -4.2500E-03 7.8684E-04 7.9308E-04 6.0172E-04 -1.5519E-04 -2.0766E-04 S10 4.8838E-02 -3.3625E-03 1.1844E-02 -4.9942E-03 2.4257E-03 -1.0741E-03 8.9738E-05 S11 -2.0085E-01 -5.0574E-02 4.0265E-03 -1.2497E-02 3.2401E-03 -1.5498E-03 1.1208E-03 S12 -8.5039E-01 6.2565E-02 -2.8249E-02 2.0380E-03 -2.7274E-03 1.2564E-03 4.0726E-04

[0125] Table 6-1

[0126]

[0127]

[0128] Table 6-2

[0129] In Example 3, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the seventh lens E7 and the eighth lens E8 are all Q2D free-form surfaces.

[0130] Figure 6A The axial chromatic aberration curve of the optical imaging system of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging system. Figure 6B The astigmatism curve of the optical imaging system of Example 3 is shown, which represents the meridional field curvature and sagittal field curvature corresponding to different field angles. Figure 6C The distortion curve of the optical camera system of Example 3 is shown, which represents the distortion value corresponding to different field angles. Figures 6A to 6C It can be seen that the optical camera system provided in Example 3 can achieve good imaging quality.

[0131] Example 4

[0132] The following reference Figures 7 to 8C An optical imaging system according to Embodiment 4 of the present application will be described. Figure 7 A structural schematic diagram of an optical camera system according to Example 4 of the present application is shown.

[0133] like Figure 7 As shown, the optical camera system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0134] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0135] Table 7 shows the basic parameters of the optical imaging system of Example 4, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0136]

[0137]

[0138] Table 7

[0139] In this embodiment, the total effective focal length f of the optical camera system is 1.47 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 7.42 mm, the image height ImgHx of the optical camera system in the X-axis direction is 1.80 mm, the image height ImgHy of the optical camera system in the Y-axis direction is 2.48 mm, the half field of view Semi-FOVx of the optical camera system in the X-axis direction is 45.0°, and the half field of view Semi-FOVy of the optical camera system in the Y-axis direction is 59.50°.

[0140] In Example 4, the object side surface and the image side surface of any lens from the third lens E3 to the sixth lens E6 are aspherical surfaces. Tables 8-1 and 8-2 list the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A5 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0141] Face number A4 A6 A8 A10 A12 A14 A16 S5 3.1907E-02 -8.5114E-03 9.8272E-04 7.4916E-04 1.3483E-04 -2.3697E-05 -2.4429E-05 S6 -2.0819E-02 1.2127E-03 2.8635E-04 4.2088E-05 -1.4238E-05 -2.4389E-05 4.6772E-06 S7 -1.5930E-02 2.8868E-04 1.4153E-04 2.9549E-06 1.6602E-05 2.4792E-05 3.8204E-05 S8 -1.1883E-01 -2.8551E-03 1.1729E-04 1.0383E-03 5.1970E-04 1.9316E-04 5.3052E-05 S9 -1.1665E-01 -3.5805E-03 6.3706E-04 8.6235E-04 5.8308E-04 -1.4821E-04 -1.9681E-04 S10 4.5647E-02 -2.2890E-03 1.1385E-02 -4.7633E-03 2.2789E-03 -9.5726E-04 4.0161E-05 S11 -2.0400E-01 -5.0270E-02 3.8913E-03 -1.2560E-02 3.1709E-03 -1.3934E-03 1.0254E-03 S12 -8.5075E-01 6.1350E-02 -2.7866E-02 2.0577E-03 -2.6550E-03 9.8909E-04 5.9275E-04

[0142] Table 8-1

[0143] Face number A18 A20 A22 A24 A26 A28 A30 S5 7.4846E-07 -1.7634E-05 -3.7940E-05 -3.4260E-05 -1.5184E-05 -2.9392E-06 0.0000E+00 S6 2.5875E-05 1.0419E-05 -1.0874E-05 -1.3988E-05 -4.6025E-06 0.0000E+00 0.0000E+00 S7 1.0876E-05 -6.9608E-06 -1.6385E-05 -5.2706E-06 2.8994E-06 4.9756E-06 0.0000E+00 S8 1.9660E-06 -1.4490E-05 -2.3728E-05 -1.5533E-05 -2.5120E-06 0.0000E+00 0.0000E+00 S9 -1.3253E-04 8.7380E-06 2.0876E-05 -1.2311E-05 -1.8980E-05 -1.2355E-05 -3.2717E-06 S10 -2.8098E-04 2.1505E-04 7.1052E-07 -4.0121E-05 -2.2688E-05 -3.3682E-06 1.7572E-05 S11 -2.2063E-04 4.6289E-04 -1.2397E-06 1.4860E-05 -3.5184E-05 -7.9664E-06 1.3611E-05 S12 -1.5507E-04 -3.4801E-04 1.4707E-04 2.1266E-04 -6.6595E-06 -9.8141E-05 -6.1394E-06

[0144] Table 8-2

[0145] In Example 4, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the seventh lens E7 and the eighth lens E8 are all Q2D free-form surfaces.

[0146] Figure 8A The axial chromatic aberration curve of the optical imaging system of Example 4 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging system. Figure 8B The astigmatism curve of the optical imaging system of Example 4 is shown, which represents the meridional field curvature and sagittal field curvature corresponding to different field angles. Figure 8C The distortion curve of the optical camera system of Example 4 is shown, which represents the distortion value corresponding to different field angles. Figures 8A to 8C It can be seen that the optical camera system provided in Example 4 can achieve good imaging quality.

[0147] Example 5

[0148] The following reference Figures 9 to 10C An optical imaging system according to Embodiment 5 of the present application will be described. Figure 9 A structural schematic diagram of an optical camera system according to Example 5 of the present application is shown.

[0149] like Figure 9 As shown, the optical camera system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0150] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0151] Table 9 shows the basic parameters of the optical imaging system of Example 5, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0152]

[0153]

[0154] Table 9

[0155] In this embodiment, the total effective focal length f of the optical camera system is 1.55 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 7.57 mm, the image height ImgHx of the optical camera system in the X-axis direction is 1.85 mm, the image height ImgHy of the optical camera system in the Y-axis direction is 2.48 mm, the half field of view Semi-FOVx of the optical camera system in the X-axis direction is 41.5°, and the half field of view Semi-FOVy of the optical camera system in the Y-axis direction is 57.50°.

[0156] In Example 5, the object side surface and the image side surface of any lens from the third lens E3 to the sixth lens E6 are aspherical surfaces. Tables 10-1 and 10-2 list the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A62, A63, A64, A59, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A61, A62, A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0157] Face number A4 A6 A8 A10 A12 A14 A16 S5 3.3230E-02 -8.8764E-03 9.4060E-04 8.8671E-04 1.0864E-04 -1.9370E-05 -2.8138E-05 S6 -2.4996E-02 1.9237E-03 2.0419E-04 -8.0511E-06 9.6518E-06 1.5102E-05 -1.0662E-05 S7 -1.7747E-02 2.0096E-04 1.0075E-04 7.5491E-05 3.7321E-05 1.4306E-05 1.6932E-05 S8 -1.3034E-01 -2.5029E-03 7.9652E-05 1.1153E-03 4.4534E-04 2.8118E-04 9.2387E-05 S9 -1.3216E-01 -2.0473E-03 -1.5798E-04 1.3440E-03 4.1384E-04 -9.7597E-05 -1.6944E-04 S10 4.1574E-02 -9.7306E-04 1.1488E-02 -4.8290E-03 2.3536E-03 -1.0365E-03 1.0137E-04 S11 -1.9961E-01 -5.8690E-02 6.9812E-03 -1.4873E-02 4.2538E-03 -1.9276E-03 1.3505E-03 S12 -9.0270E-01 6.3470E-02 -2.9421E-02 2.0352E-03 -2.6350E-03 6.9286E-04 1.0329E-03

[0158] Table 10-1

[0159] Face number A18 A20 A22 A24 A26 A28 A30 S5 -1.4863E-05 -1.7387E-05 -2.5818E-05 -3.0098E-05 -2.1734E-05 -7.3925E-06 0.0000E+00 S6 2.8413E-06 1.1801E-05 -4.9361E-06 -1.0960E-05 -4.7995E-06 0.0000E+00 0.0000E+00 S7 5.3280E-06 5.3440E-06 -3.1216E-06 -2.8935E-06 -3.2131E-06 -6.3610E-08 0.0000E+00 S8 -3.8009E-05 -2.3857E-05 -1.7690E-05 -1.0635E-05 -4.3007E-06 0.0000E+00 0.0000E+00 S9 -1.9373E-04 1.1548E-06 3.9497E-05 4.4631E-07 -2.0808E-05 -1.9379E-05 -5.1420E-06 S10 -3.7472E-04 3.1446E-04 -4.9939E-05 -3.3186E-05 -5.3627E-05 1.8007E-05 2.2580E-05 S11 -4.2912E-04 6.0277E-04 -7.3111E-05 1.0373E-04 -9.2184E-05 1.5505E-05 1.7064E-07 S12 -4.1506E-04 -3.7352E-04 2.4190E-04 2.7165E-04 -1.4335E-04 -2.8654E-05 -1.6589E-05

[0160] Table 10-2

[0161] In Example 5, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the seventh lens E7 and the eighth lens E8 are all Q2D free-form surfaces.

[0162] Figure 10A The axial chromatic aberration curve of the optical imaging system of Example 5 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging system. Figure 10B The astigmatism curve of the optical imaging system of Example 5 is shown, which represents the meridional field curvature and sagittal field curvature corresponding to different field angles. Figure 10C The distortion curve of the optical camera system of Example 5 is shown, which represents the distortion value corresponding to different field angles. Figures 10A to 10C It can be seen that the optical camera system provided in Example 5 can achieve good imaging quality.

[0163] Example 6

[0164] The following reference Figures 11 to 12C An optical imaging system according to Example 6 of the present application will be described. Figure 11 A structural schematic diagram of an optical camera system according to Example 6 of the present application is shown.

[0165] like Figure 11 As shown, the optical camera system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0166] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0167] Table 11 shows the basic parameters of the optical imaging system of Example 6, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0168]

[0169]

[0170] Table 11

[0171] In this embodiment, the total effective focal length f of the optical camera system is 1.54 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 7.69 mm, the image height ImgHx of the optical camera system in the X-axis direction is 1.88 mm, the image height ImgHy of the optical camera system in the Y-axis direction is 2.48 mm, the half field of view Semi-FOVx of the optical camera system in the X-axis direction is 40.05°, and the half field of view Semi-FOVy of the optical camera system in the Y-axis direction is 58°.

[0172] In Example 6, the object side surface and the image side surface of any lens from the third lens E3 to the sixth lens E6 are aspherical surfaces. Tables 12-1 and 12-2 list the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0173] Face number A4 A6 A8 A10 A12 A14 A16 S5 3.4359E-02 -9.3875E-03 1.3271E-03 7.2231E-04 8.2154E-05 -4.5704E-06 -1.9377E-05 S6 -3.1065E-02 3.0498E-03 1.2405E-04 -1.2780E-04 5.5970E-06 8.9872E-05 1.2079E-05 S7 -2.1446E-02 1.4178E-04 1.2052E-04 8.1831E-05 6.4762E-05 1.5314E-05 1.9593E-05 S8 -1.3627E-01 -1.3859E-03 2.6678E-05 1.1946E-03 3.5440E-04 2.2010E-04 1.8061E-04 S9 -1.4781E-01 1.7232E-03 -9.6482E-04 1.4992E-03 4.8061E-04 -2.5360E-04 -6.5908E-05 S10 4.3428E-02 -6.2578E-04 1.1094E-02 -4.6541E-03 2.2900E-03 -1.0391E-03 1.2979E-04 S11 -2.2724E-01 -5.0954E-02 4.2551E-03 -1.3236E-02 3.4364E-03 -1.5814E-03 1.2068E-03 S12 -1.1184E+00 1.0119E-01 -4.4044E-02 8.4037E-03 -5.6253E-03 2.1906E-03 1.7842E-04

[0174] Table 12-1

[0175] Face number A18 A20 A22 A24 A26 A28 A30 S5 -6.5740E-06 -2.5510E-06 -2.5940E-05 -3.8867E-05 -2.7152E-05 -6.9750E-06 0.0000E+00 S6 -3.4778E-05 -3.4944E-05 -3.7750E-06 1.0064E-05 5.8262E-06 0.0000E+00 0.0000E+00 S7 8.3109E-06 5.4450E-06 -5.4836E-06 -5.2548E-06 -5.2254E-06 4.9815E-07 0.0000E+00 S8 -1.7145E-06 -9.2077E-05 -4.4986E-05 8.4395E-06 1.0593E-05 0.0000E+00 0.0000E+00 S9 -1.2254E-04 -7.4768E-05 -1.0227E-05 2.6181E-05 4.0792E-06 -1.5567E-05 -1.0299E-05 S10 -3.9417E-04 3.0793E-04 -4.4612E-06 -8.0380E-05 -5.8410E-05 3.3089E-05 2.4935E-05 S11 -3.1544E-04 5.3187E-04 -7.5320E-05 9.1773E-05 -6.7983E-05 3.0744E-05 -1.7364E-05 S12 2.8386E-05 -4.2261E-04 8.3541E-05 2.4731E-04 7.8065E-05 -1.8024E-05 -1.1888E-04

[0176] Table 12-2

[0177] In Example 6, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the seventh lens E7 and the eighth lens E8 are all Q2D free-form surfaces.

[0178] Figure 12A The axial chromatic aberration curve of the optical imaging system of Example 6 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging system. Figure 12B The astigmatism curve of the optical imaging system of Example 6 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different field angles. Figure 12C The distortion curve of the optical camera system of Example 6 is shown, which represents the distortion value corresponding to different field angles. 12A to 12C It can be seen that the optical camera system provided in Example 6 can achieve good imaging quality.

[0179] Example 7

[0180] The following reference Figures 13 to 14C An optical imaging system according to Example 7 of the present application will be described. Figure 13 A structural schematic diagram of an optical camera system according to Example 7 of the present application is shown.

[0181] like Figure 13 As shown, the optical camera system includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0182] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being convex. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0183] Table 13 shows the basic parameters of the optical imaging system of Example 7, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0184]

[0185] Table 13

[0186] In this embodiment, the total effective focal length f of the optical camera system is 1.54 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S19 is 7.69 mm, the image height ImgHx of the optical camera system in the X-axis direction is 1.88 mm, the image height ImgHy of the optical camera system in the Y-axis direction is 2.48 mm, the half field of view Semi-FOVx of the optical camera system in the X-axis direction is 40.23°, and the half field of view Semi-FOVy of the optical camera system in the Y-axis direction is 58°.

[0187] In Example 7, the object side surface and the image side surface of any lens from the third lens E3 to the sixth lens E6 are aspherical surfaces. Tables 14-1 and 14-2 list the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 and A 30 .

[0188] Face number A4 A6 A8 A10 A12 A14 A16 S5 2.9645E-02 -8.5291E-03 1.0227E-03 8.1338E-04 6.7263E-05 1.0083E-05 -3.2221E-05 S6 -3.5065E-02 4.2816E-03 -2.5926E-04 -5.4406E-05 -1.4931E-05 1.0573E-04 1.2397E-05 S7 -2.3905E-02 2.7440E-04 1.5351E-04 7.0003E-05 7.6108E-05 3.8905E-06 2.2932E-05 S8 -1.3865E-01 -1.3195E-03 1.9737E-04 1.1317E-03 2.8797E-04 2.4663E-04 2.0244E-04 S9 -1.5501E-01 2.4578E-03 -1.1913E-03 1.5356E-03 4.7393E-04 -2.5187E-04 -1.7333E-05 S10 3.6258E-02 1.5903E-03 1.0063E-02 -4.1405E-03 2.0160E-03 -9.5203E-04 1.6101E-04 S11 -2.5410E-01 -4.4257E-02 1.8607E-03 -1.2188E-02 3.0492E-03 -1.3274E-03 9.3528E-04 S12 -1.1703E+00 1.0622E-01 -4.5729E-02 8.7788E-03 -5.7910E-03 2.3526E-03 5.0166E-05

[0189] Table 14-1

[0190] Face number A18 A20 A22 A24 A26 A28 A30 S5 -8.7572E-06 1.0561E-05 -2.9970E-05 -4.3281E-05 -2.6857E-05 -5.8756E-06 0.0000E+00 S6 -2.5773E-05 -4.8873E-05 -5.3614E-06 8.9735E-06 1.0815E-05 0.0000E+00 0.0000E+00 S7 -2.1020E-07 4.5847E-06 -7.0676E-06 -1.7629E-07 -4.7798E-06 2.1897E-06 0.0000E+00 S8 8.4236E-07 -9.0294E-05 -4.4728E-05 2.1027E-06 9.6227E-06 0.0000E+00 0.0000E+00 S9 -1.5349E-04 -1.0168E-04 -7.7586E-06 3.7471E-05 8.1906E-06 -1.2093E-05 -1.3004E-05 S10 -4.0372E-04 2.6336E-04 1.8494E-05 -9.1153E-05 -2.9131E-05 2.3996E-05 1.9371E-05 S11 -1.4762E-04 4.9944E-04 8.3348E-07 -2.5135E-05 -6.6123E-05 3.3602E-05 1.1103E-05 S12 7.0729E-05 -4.4338E-04 1.8463E-04 1.3576E-04 8.2747E-05 -1.0841E-05 -1.0206E-04

[0191] Table 14-2

[0192] In Example 7, the object-side surface and the image-side surface of any one of the first lens E1, the second lens E2, the seventh lens E7 and the eighth lens E8 are all Q2D free-form surfaces.

[0193] Figure 14A The axial chromatic aberration curve of the optical imaging system of Example 7 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging system. Figure 14B The astigmatism curve of the optical imaging system of Example 7 is shown, which represents the meridional field curvature and sagittal field curvature corresponding to different field angles. Figure 14C The distortion curve of the optical camera system of Example 7 is shown, which represents the distortion value corresponding to different field angles. 14A to 14C It can be seen that the optical camera system provided in Example 7 can achieve good imaging quality.

[0194] In summary, the conditional expressions of Examples 1 to 7 satisfy the relationship shown in Table 15.

[0195]

[0196]

[0197] Table 15

[0198] The present application also provides an imaging device, wherein the electronic photosensitive element thereof may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone 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 camera system described above.

[0199] The above description is merely a preferred embodiment of the present application and an illustration 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 the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical camera system, characterized in that Along the optical axis from the object side to the image side, they include: a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave; a second lens having positive refractive power, with a convex object-side surface and a concave image-side surface; a third lens element having positive optical power and a convex object-side surface; a fourth lens element having positive optical power, with a convex object-side surface and a convex image-side surface; a fifth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex; a sixth lens element having negative optical power and a concave image-side surface; a seventh lens element having positive refractive power and a convex image-side surface; an eighth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex; wherein the number of lenses having optical power in the optical camera system is eight; The distance from the center of the effective diameter portion of the object side surface of the fifth lens to the imaging surface along the optical axis is shorter than the distance from the edge of the effective diameter portion of the object side surface of the fifth lens to the imaging surface along the optical axis; At least two lenses among the first lens to the eighth lens are free-form surface lenses; The curvature radius R9 of the object-side surface of the fifth lens, the curvature radius R10 of the image-side surface of the fifth lens, the center thickness CT5 of the fifth lens on the optical axis, the effective focal length f5 of the fifth lens, and the total effective focal length f of the optical camera system satisfy -1.23≤[(R9-R10) / CT5] / (f5 / f)≤-0.59, The total effective focal length f of the optical camera system and the entrance pupil diameter EPD of the optical camera system satisfy 2.24≤f / EPD≤2.40, and A center thickness CT7 of the seventh lens on the optical axis and a center thickness CT8 of the eighth lens on the optical axis satisfy 3.17≤CT7 / CT8≤4.

18.

2. The optical imaging system according to claim 1, wherein: The maximum effective semi-aperture DT31 of the object-side surface of the third lens, the center thickness CT3 of the third lens on the optical axis, the effective focal length f3 of the third lens, and the curvature radius R5 of the object-side surface of the third lens satisfy 0.70<(DT31 / CT3) / (f3 / R5)≤1.

22.

3. The optical imaging system according to claim 1, wherein: The curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the effective focal length f4 of the fourth lens and the total effective focal length f of the optical camera system meet 0.15 mm. -2 <[(R7-R8) / (R7+R8)] / (f4×f)<1mm -2 .

4. The optical camera system according to claim 1, wherein: The center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, the center thickness CT6 of the sixth lens on the optical axis, and the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfy 0.3<(CT3+CT4+CT5+CT6) / f3456<0.

5.

5. The optical imaging system according to claim 1, wherein: A combined focal length f12 of the first lens and the second lens and a combined focal length f78 of the seventh lens and the eighth lens satisfy -1.93≤f12 / f78<-1.

5.

6. The optical camera system according to claim 1, wherein: The maximum effective semi-aperture DT51 of the object side surface of the fifth lens, the edge thickness ET5 of the fifth lens, the maximum effective semi-aperture DT61 of the object side surface of the sixth lens, the edge thickness ET6 of the sixth lens, the air gap T56 between the fifth lens and the sixth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy 0.39≤(DT51 / ET5+DT61 / ET6)×[T56 / (CT5+CT6)]<1.

65.

7. The optical camera system according to claim 1, wherein: A curvature radius R9 of the object-side surface of the fifth lens, a curvature radius R10 of the image-side surface of the fifth lens, and an effective focal length f5 of the fifth lens satisfy 0.45≤(R9+R10) / f5<0.

75.

8. The optical imaging system according to claim 1, wherein: An air gap T56 between the fifth lens and the sixth lens on the optical axis, an air gap T67 between the sixth lens and the seventh lens on the optical axis, a center thickness CT6 of the sixth lens on the optical axis, and an effective focal length f6 of the sixth lens satisfy -1.60<(T56+CT6+T67)×10 / f6≤-0.

72.

9. The optical camera system according to claim 1, wherein: A curvature radius R11 of the object-side surface of the sixth lens and a curvature radius R12 of the image-side surface of the sixth lens satisfy 0.4<(R11-R12) / (R11+R12)≤1.

02.

10. The optical imaging system according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, an air interval T12 between the first lens and the second lens on the optical axis, and an air interval T23 between the second lens and the third lens on the optical axis satisfy 3.60≤CT1 / T12+CT2 / T23≤3.

93.

11. The optical imaging system according to claim 1, wherein: An image height ImgHx of the optical camera system in the X-axis direction satisfies 1.80 mm ≤ ImgHx ≤ 1.88 mm, and an image height ImgHy of the optical camera system in the Y-axis direction satisfies 2.1 mm < ImgHy ≤ 2.48 mm.

12. The optical camera system according to claim 1, wherein: The half field angle SemiFOVx of the optical camera system in the X-axis direction satisfies 40.05°≤SemiFOVx≤45.8°, and the half field angle SemiFOVy of the optical camera system in the Y-axis direction satisfies 53°≤SemiFOVy≤64.5°.

13. The optical camera system according to any one of claims 1 to 12, characterized in that: The first lens, the second lens, the seventh lens, and the eighth lens are free-form surface lenses.

Images