Optical imaging device

Abstract

The utility model discloses an optical imaging device which comprises a lens cone, an optical lens group and a spacer group, wherein the optical lens group and the spacer group are arranged in the lens cone; the optical lens group comprises a first lens to a seventh lens, the first lens, the fourth lens and the sixth lens have negative focal power, and the second lens, the third lens, the fifth lens and the seventh lens have positive focal power; the spacer group comprises a fourth spacer which is arranged on the image side surface of the fourth lens and is in contact with the image side surface of the fourth lens, a fifth spacer which is arranged on the image side surface of the fifth lens and is in contact with the image side surface of the fifth lens, and a sixth spacer which is arranged on the image side surface of the sixth lens and is in contact with the image side surface of the sixth lens; the number of the lenses with the focal power of the optical imaging device is seven. Half Semi-FOV of the maximum field angle of the optical imaging device satisfies: 60 degree lt; the method comprises the following steps: carrying out half-FOVlt; 80 DEG C; the spacing distance EP45 between the fourth spacer and the fifth spacer along the optical axis, the spacing distance EP56 between the fifth spacer and the sixth spacer along the optical axis, the effective focal length f5 of the fifth lens and the effective focal length f6 of the sixth lens meet the following conditions:-1lt; eP45 / f5 + EP56 / f6lt; 0.

Description

Technical Field

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

[0002] With the development of science and technology, wide-angle lenses have been widely used in fields such as mobile phones, security, automobiles, and drones due to their characteristics of a wide shooting coverage range and the ability to better highlight the details and layering of scenes.

[0003] In order to achieve the characteristics of wide angle, the optical imaging device is designed in the structure of seven lenses. Among them, the rear lens has a greater impact on the overall imaging of the optical imaging device. However, the structural setting of the rear lens in the existing optical imaging device is unreasonable, which will lead to problems such as high surface sensitivity and easy deformation of the rear lens, thus affecting the imaging effect of the optical imaging device. Summary of the Utility Model

[0004] One aspect of this application provides such an optical imaging device, which includes a lens barrel and an optical lens group and a spacer group disposed in the lens barrel. The optical lens group includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, a sixth lens with a negative optical power, and a seventh lens with a positive optical power arranged in sequence from the object side to the image side along the optical axis. The spacer group includes a fourth spacer disposed on and in contact with the image side surface of the fourth lens, a fifth spacer disposed on and in contact with the image side surface of the fifth lens, and a sixth spacer disposed on and in contact with the image side surface of the sixth lens. Among them, the number of lenses with optical power in the optical imaging device is seven. Half of the maximum field of view Semi-FOV of the optical imaging device satisfies: 60° < Semi-FOV < 80°; the axial spacing distance EP45 between the fourth spacer and the fifth spacer, the axial spacing distance EP56 between the fifth spacer and the sixth spacer, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: -1 < EP45 / f5 + EP56 / f6 < 0.

[0005] According to an exemplary embodiment of this application, the radius of curvature R10 of the image side surface of the fifth lens, the radius of curvature R11 of the object side surface of the sixth lens, and the inner diameter d5s of the object side surface of the fifth spacer satisfy: -4 < d5s / (R10 - R11) < -3.

[0006] According to an exemplary embodiment of the present application, the air gap T67 between the sixth lens and the seventh lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 4.5 < T67 / CT6 < 5; the maximum thickness CP6 of the sixth spacer and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.9 < CP6 / T67 < 1.3.

[0007] According to an exemplary embodiment of the present application, the effective full aperture DT62 of the light-transmitting portion on the image side of the sixth lens and the inner diameter d6s of the object side of the sixth spacer satisfy 1.5 < d6s / DT62 < 2; the effective full aperture DT71 of the light-transmitting portion on the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer satisfy: 0.9 < d6m / DT71 < 1.

[0008] According to an exemplary embodiment of the present application, the spacer group further includes a sixth auxiliary spacer disposed on and in contact with the image side of the sixth spacer. Among them, the effective full aperture DT71 of the light-transmitting portion on the object side of the seventh lens, the inner diameter d6bm of the image side of the sixth auxiliary spacer, and the outer diameter D6bm of the image side of the sixth auxiliary spacer satisfy: 0.1 < (D6bm - DT71) / d6bm < 0.3.

[0009] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on and in contact with the image side of the first lens. Among them, the curvature radius R1 of the object side of the first lens and the curvature radius R2 of the image side of the first lens satisfy: 80 < |R1 / R2| < 220; the axial distance EP01 between the object-side end face of the lens barrel and the first spacer along the optical axis and the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the non-light-transmitting portion of the image side of the first lens satisfy: 1.4 < EP01 / SAG12 < 1.8.

[0010] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on and in contact with the image side of the first lens. Among them, the effective full aperture DT21 of the light-transmitting portion on the object side of the second lens, the effective full aperture DT71 of the light-transmitting portion on the object side of the seventh lens, the outer diameter D1m of the image side of the first spacer, and the outer diameter D6m of the image side of the sixth spacer satisfy: 4 < (DT71 - DT21) / (D6m - D1m) < 10.

[0011] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on and in contact with the image side of the first lens and a second spacer disposed on and in contact with the image side of the second lens. Wherein, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy: 0.2 < R3 / R4 < 0.7; the spacing distance EP12 of the first spacer and the second spacer along the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 2 < EP12 / CT2 < 3.8.

[0012] According to an exemplary embodiment of the present application, the spacer group further includes a first spacer disposed on and in contact with the image side of the first lens and a second spacer disposed on and in contact with the image side of the second lens. Wherein, the effective focal length f2 of the second lens, the maximum thickness CP2 of the second spacer, and the spacing distance EP12 of the first spacer and the second spacer along the optical axis satisfy: 15 < f2 / (CP2 + EP12) < 25.

[0013] According to an exemplary embodiment of the present application, the spacer group further includes a second spacer disposed on and in contact with the image side of the second lens and a second auxiliary spacer disposed on and in contact with the image side of the second spacer. Wherein, the maximum thickness CP2 of the second spacer satisfies: CP2 > 0.3 mm; 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 inner diameter d2bs of the object side of the second auxiliary spacer, and the inner diameter d2bm of the image side of the second auxiliary spacer satisfy: 0 < d2bs / R4 + d2bm / R5 < 0.5.

[0014] According to an exemplary embodiment of the present application, the spacer group further includes a third spacer disposed on and in contact with the image side of the third lens. Wherein, the air gap between the third lens and the fourth lens on the optical axis is less than the air gap between any two adjacent lenses among the first lens to the third lens on the optical axis, and less than the air gap between any two adjacent lenses among the fourth lens to the seventh lens on the optical axis. The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the inner diameter d3s of the object side of the third spacer satisfy: -10 < (f3 + f4) / d3s < -8.

[0015] By making the optical imaging device satisfy "60° < Semi - FOV < 80°", this application is conducive to achieving the wide - angle characteristic. At the same time, by coordinating and controlling the relationship between the axial spacing distances of the fourth spacer and the fifth spacer, the fifth spacer and the sixth spacer, the effective focal length of the fifth lens, and the effective focal length of the sixth lens, when the absolute values of the effective focal lengths of the fifth lens and the sixth lens are relatively close and the optical powers of the fifth lens and the sixth lens are complementary, it is possible to make the edge thicknesses of the fifth lens and the sixth lens as uniform as possible, ensure that the refraction of the marginal rays at the fifth lens and the sixth lens is relatively gentle, reduce the overall sensitivity of the optical imaging device, and improve the imaging effect of the optical imaging device. Description of the Drawings

[0016] Other features, objects, and advantages of this application will become more apparent by reading the detailed description of the non - restrictive embodiments with reference to the following drawings. Among them:

[0017] Figure 1 Shows a parameter annotation diagram of the optical imaging device according to this application;

[0018] Figure 2 Shows a schematic structural diagram of the optical imaging device according to Embodiment 1 of this application;

[0019] Figure 3 Shows a schematic structural diagram of the optical imaging device according to Embodiment 2 of this application;

[0020] Figure 4 Shows a schematic structural diagram of the optical imaging device according to Embodiment 3 of this application;

[0021] Figure 5A 、 Figure 5B 、 Figure 5C Respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging device according to Embodiment 1, 2, or 3 of this application;

[0022] Figure 6 Shows a schematic structural diagram of the optical imaging device according to Embodiment 4 of this application;

[0023] Figure 7 Shows a schematic structural diagram of the optical imaging device according to Embodiment 5 of this application;

[0024] Figure 8 Shows a schematic structural diagram of the optical imaging device according to Embodiment 6 of this application;

[0025] Fig. 9A 、 Fig. 9B 、 Fig. 9C Respectively show the axial chromatic aberration curve, astigmatism curve, and distortion curve of the optical imaging device according to Embodiment 4, 5, or 6 of this application;

[0026] Fig.10 A schematic structural diagram of an optical imaging device according to Embodiment 7 of the present application is shown;

[0027] Fig.11 A schematic structural diagram of an optical imaging device according to Embodiment 8 of the present application is shown;

[0028] Fig.12 A schematic structural diagram of an optical imaging device according to Embodiment 9 of the present application is shown;

[0029] Fig.13A , Fig. 13B , Fig. 13C The axial chromatic aberration curve, astigmatism curve and distortion curve of the optical imaging device of Embodiment 7, 8 or 9 of the present application are respectively shown;

[0030] Fig.14A The Modulation Transfer Function (MTF) curve of the optical imaging device when it satisfies EP45 / f5+EP56 / f6=-0.17 is shown;

[0031] Fig. 14B shows a modulation transfer function curve when the optical imaging device satisfies EP45 / f5+EP56 / f6=-1.32; and

[0032] Fig. 14C The modulation transfer function curve when the optical imaging device satisfies EP45 / f5+EP56 / f6=0.33 is shown. DETAILED DESCRIPTION

[0033] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numerals refer to the same elements.

[0034] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0035] In the 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 shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0036] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface 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 object is called the object side of the lens, and the surface of each lens closest to the image plane is called the image side of the lens.

[0037] It should also be understood that the terms "including" and / or "having", 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. In addition, when describing the embodiments of the present application, the term "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0038] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0039] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0040] Figure 1 : is a parameter-labeled diagram of an optical imaging device according to an exemplary embodiment of the present application. Figure 1 , D1m represents the outer diameter of the image side surface of the first spacer, d2bs represents the inner diameter of the object side surface of the second auxiliary spacer, d2bm represents the inner diameter of the image side surface of the second auxiliary spacer, d3s represents the inner diameter of the object side surface of the third spacer, d5s represents the inner diameter of the object side surface of the fifth spacer, d6s represents the inner diameter of the object side surface of the sixth spacer, d6m represents the inner diameter of the image side surface of the sixth spacer, D6m represents the outer diameter of the image side surface of the sixth spacer, d6bm represents the inner diameter of the image side surface of the sixth auxiliary spacer, D6bm represents the outer diameter of the image side surface of the sixth auxiliary spacer, EP01 represents the spacing distance between the object side end surface of the lens barrel and the first spacer along the optical axis, EP12 represents the spacing distance between the first spacer and the second spacer along the optical axis, CP2 represents the maximum thickness of the second spacer, EP45 represents the spacing distance between the fourth spacer and the fifth spacer along the optical axis, EP56 represents the spacing distance between the fifth spacer and the sixth spacer along the optical axis, and CP6 represents the maximum thickness of the sixth spacer.

[0041] refer to Figures 2 to 4 , Figures 6 to 8 as well as Figures 10 to 12 In a first aspect of the present application, an optical imaging device is provided. The optical imaging device may include an optical lens group. The optical lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the seventh lens, any two adjacent lenses may have an air gap between them.

[0042] In an exemplary embodiment, the first lens may have negative optical power. The second lens may have positive optical power.

[0043] The third lens may have positive optical power. The fourth lens may have negative optical power. The fifth lens may have positive optical power.

[0044] The sixth lens may have negative power. The seventh lens may have positive power.

[0045] In example embodiments, the object-side surface of the first lens may be a convex surface or a concave surface, and the image-side surface may be a concave surface.

[0046] In example embodiments, the object-side surface of the second lens may be a convex surface, and the image-side surface may be a concave surface.

[0047] In example embodiments, the object-side surface of the third lens may be a convex surface, and the image-side surface may be a convex surface.

[0048] In example embodiments, the object-side surface of the fourth lens may be a convex surface, and the image-side surface may be a concave surface.

[0049] In example embodiments, the object-side surface of the fifth lens may be a convex surface, and the image-side surface may be a convex surface.

[0050] In example embodiments, the object-side surface of the sixth lens may be a concave surface, and the image-side surface may be a convex surface.

[0051] In example embodiments, the object-side surface of the seventh lens may be a convex surface, and the image-side surface may be a convex surface.

[0052] In an exemplary embodiment, the optical imaging device may further include a stop. The stop may be disposed between the second lens and the third lens.

[0053] In an exemplary embodiment, the number of lenses having optical power of the optical imaging device may be seven.

[0054] In an exemplary embodiment, the optical imaging device may further include a spacer group, which may include one or more of a first spacer, a second spacer, a second auxiliary spacer, a third spacer, a fourth spacer, a fifth spacer, a sixth spacer, and a sixth auxiliary spacer. The first spacer may be disposed on the image side surface of the first lens and at least partially in contact with the image side surface of the first lens. The second spacer may be disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens. The second auxiliary spacer may be disposed on the image side surface of the second spacer and at least partially in contact with the image side surface of the second spacer. The third spacer may be disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens. The fourth spacer may be disposed on the image side surface of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The fifth spacer may be disposed on the image side surface of the fifth lens and at least partially in contact with the image side surface of the fifth lens. The sixth spacer may be disposed on the image side surface of the sixth lens and at least partially in contact with the image side surface of the sixth lens. The sixth auxiliary spacer may be disposed on the image side surface of the sixth spacer and at least partially in contact with the image side surface of the sixth spacer. Reasonable use of the spacers can effectively avoid the risk of stray light, reduce the interference to the image quality, and thus improve the imaging quality of the optical imaging device.

[0055] In an exemplary embodiment, the optical imaging device may further include a lens barrel, and the optical lens group and the spacer group are disposed inside the lens barrel. The lens barrel may include an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface. Among them, the end face of the lens barrel closest to the object side is the object-side end face of the lens barrel, and the end face of the lens barrel closest to the image side is the image-side end face of the lens barrel; in the direction perpendicular to the optical axis, the outermost surface of the lens barrel away from the optical axis is the outer ring surface, and the innermost surface of the lens barrel closest to the optical axis is the inner ring surface. The inner ring surface of the lens barrel is stepped.

[0056] In an exemplary embodiment, the air gap between the third lens and the fourth lens on the optical axis is smaller than the air gap between any two adjacent lenses among the first lens to the third lens on the optical axis, and is smaller than the air gap between any two adjacent lenses among the fourth lens to the seventh lens on the optical axis.

[0057] In an exemplary embodiment, half of the maximum field of view angle, Semi-FOV, of the optical imaging device may satisfy: 60° < Semi-FOV < 80°. As an example, 65° < Semi-FOV < 72°. Reasonable configuration of half of the maximum field of view angle of the optical imaging device is beneficial for the optical imaging device to achieve the characteristic of wide angle.

[0058] In an exemplary embodiment, the spacing distance EP45 between the fourth spacer and the fifth spacer along the optical axis, the spacing distance EP56 between the fifth spacer and the sixth spacer along the optical axis, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens may satisfy: -1 < EP45 / f5 + EP56 / f6 < 0. By controlling the above conditional expression, it is possible to make the absolute values of the effective focal lengths of the fifth lens and the sixth lens relatively close, ensuring that the optical powers of the fifth lens and the sixth lens are complementary; at the same time, it is also possible to make the edge thicknesses of the fifth lens and the sixth lens as uniform as possible, ensuring that the refraction of the marginal rays at the fifth lens and the sixth lens is relatively gentle, reducing the overall sensitivity of the optical imaging device, and improving the imaging effect of the optical imaging device.

[0059] In this application, EP45 / f5 + EP56 / f6 is constrained within the range of -1 to 0. When the fifth lens and the sixth lens have appropriate optical powers, it is possible to ensure that the fifth lens and the sixth lens have appropriate edge thicknesses, improve the processability of the fifth lens and the sixth lens, and improve the imaging effect of the optical imaging device; at the same time, it is also possible to avoid the problems of the marginal surface shape sensitivity of the sixth lens and the poor imaging effect of the optical imaging device caused by too large EP56, and avoid the problems of the easy inclination of the fifth lens during assembly, the poor assembly uniformity of the optical imaging device, the negative field curvature of the outer field of view, and the large dispersion caused by too large EP45.

[0060] Table 1 shows the imaging effects of three optical imaging devices (for example, optical imaging device 1, optical imaging device 2, and optical imaging device 3). Fig.14A It is the modulation transfer function curve when the optical imaging device 1 satisfies EP45 / f5 + EP56 / f6 = -0.17. Fig. 14B It is the modulation transfer function curve when the optical imaging device 2 satisfies EP45 / f5 + EP56 / f6 = -1.32. Fig. 14C It is the modulation transfer function curve when the optical imaging device 3 satisfies EP45 / f5 + EP56 / f6 = 0.33.

[0061] Optical imaging device 1 Optical imaging device 2 Optical imaging device 3 Conditional evaluation EP45 / f5+EP56 / f6=-0.17 EP45 / f5+EP56 / f6=-1.32 EP45 / f5+EP56 / f6=0.33 Diagram Fig.14A Fig. 14B Fig. 14C Imaging effect good Poor Poor

[0062] Table 1

[0063] From Fig.14A it can be seen that the peaks of the optical modulation function values of the optical imaging device 1 are relatively concentrated. For example, the peaks are in the range of 0.6 to 0.9, and are mainly concentrated near the defocus position of 0 mm. From Fig. 14B it can be seen that the peaks of the optical modulation function values of the optical imaging device 2 are mainly concentrated at the defocus positions of -0.02 mm to 0.02 mm. From Fig. 14CLooking at it, the peak value of the optical modulation function value of the optical imaging device 3 drops relatively. For example, the peak value is mainly in the range of 0.4 to 0.85, and mainly concentrated at the defocus position from -0.02 mm to 0.02 mm. It can be seen that by controlling the optical imaging device to satisfy "-1 < EP45 / f5 + EP56 / f6 < 0", it helps to improve the imaging effect of the optical imaging device.

[0064] In an exemplary embodiment, the radius of curvature R10 of the image side of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, and the inner diameter d5s of the object side of the fifth spacer can satisfy: -4 < d5s / (R10 - R11) < -3. By controlling the above conditional expression, the radii of curvature of the image side of the fifth lens and the object side of the sixth lens can be restricted to ensure that light enters the object side of the sixth lens from the image side of the fifth lens along a predetermined path; at the same time, the inner diameter of the object side of the fifth spacer can be restricted within a certain range, so that the fifth spacer can effectively intercept stray light that may enter the sixth lens, improving the imaging quality of the optical imaging device.

[0065] In an exemplary embodiment, the air gap T67 between the sixth lens and the seventh lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis can satisfy: 4.5 < T67 / CT6 < 5; the maximum thickness CP6 of the sixth spacer and the air gap T67 between the sixth lens and the seventh lens on the optical axis can satisfy: 0.9 < CP6 / T67 < 1.3. In order to meet the wide-angle characteristics of the optical imaging device, the sixth lens and the seventh lens usually have a relatively large outer diameter, which results in poor assembly stability of the sixth lens, the seventh lens, and the sixth spacer located between them. Therefore, by controlling the ratio of the air gap between the sixth lens and the seventh lens to the central thickness of the sixth lens and the ratio of the maximum thickness of the sixth spacer to the air gap between the sixth lens and the seventh lens, the thicknesses of the sixth lens and the sixth spacer can be restricted within an appropriate range, improving the assembly stability of the sixth lens, the seventh lens, and the sixth spacer to a certain extent, and further enhancing the quality and performance of the optical imaging device.

[0066] In an exemplary embodiment, the effective full aperture DT62 of the light-transmitting portion on the image side of the sixth lens and the inner diameter d6s of the object side of the sixth spacer may satisfy 1.5 < d6s / DT62 < 2; the effective full aperture DT71 of the light-transmitting portion on the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer may satisfy: 0.9 < d6m / DT71 < 1. By controlling the above conditional expressions, it is possible to constrain the effective full aperture of the light-transmitting portion on the image side of the sixth lens, the effective full aperture of the light-transmitting portion on the object side of the seventh lens, and the inner diameters of the object side and the image side of the sixth spacer, thereby effectively restricting the position where light passes through the seventh lens, reducing the possibility of stray light occurring at the seventh lens, and at the same time ensuring the path accuracy of light when passing through the last lens (i.e., the seventh lens), so as to facilitate controlling the image height of each field of view to the desired design position.

[0067] In an exemplary embodiment, the effective full aperture DT71 of the light-transmitting portion on the object side of the seventh lens, the inner diameter d6bm of the image side of the sixth auxiliary spacer, and the outer diameter D6bm of the image side of the sixth auxiliary spacer may satisfy: 0.1 < (D6bm - DT71) / d6bm < 0.3. By controlling the above conditional expressions, it is possible to constrain the effective full aperture of the light-transmitting portion on the object side of the seventh lens, ensure that light can be refracted along a predetermined path at the seventh lens, so as to facilitate controlling the image height of each field of view to the desired position; at the same time, it can also indirectly constrain the outer diameters of the sixth lens and the seventh lens, which is beneficial to controlling the outer diameter of the image side end of the lens barrel to the desired specification.

[0068] In an exemplary embodiment, the radius of curvature R1 of the object side of the first lens and the radius of curvature R2 of the image side of the first lens may satisfy: 80 < |R1 / R2| < 220; the axial distance EP01 between the object side end face of the lens barrel and the first spacer along the optical axis and the axial distance SAG12 between the intersection of the image side of the first lens and the optical axis and the vertex of the non-light-transmitting portion of the image side of the first lens may satisfy: 1.4 < EP01 / SAG12 < 1.8. By controlling the ratio of the radius of curvature of the object side and the image side of the first lens, it is beneficial to ensure that the optical imaging device achieves a large field of view angle; at the same time, by restricting the ratio of the axial distance between the object side end face of the lens barrel and the first spacer along the optical axis and the axial distance between the intersection of the image side of the first lens and the optical axis and the vertex of the non-light-transmitting portion of the image side of the first lens, it is possible to avoid the problem of difficult aberration correction caused by excessive bending of the first lens, reduce the deformation risk caused by excessive bending moment of the first lens after the optical imaging device is assembled, which is beneficial to improving the assembly stability of the optical imaging device and ensuring the processing quality of the optical imaging device.

[0069] In an exemplary embodiment, the effective full aperture DT21 of the light transmissive portion on the object side of the second lens, the effective full aperture DT71 of the light transmissive portion on the object side of the seventh lens, the outer diameter D1m of the image side of the first spacer, and the outer diameter D6m of the image side of the sixth spacer may satisfy: 4 < (DT71 - DT21) / (D6m - D1m) < 10. By controlling the above conditional expression, the difference in the effective full apertures of the light transmissive portions on the object sides of the seventh lens and the second lens can be constrained within a reasonable range, reducing the overall step difference of the optical imaging device and minimizing the deformation amount of the lens during the assembly process. At the same time, it is also possible to limit the outer diameters of the image sides of the first spacer and the sixth spacer, thereby effectively controlling the position where the light passes through the seventh lens, reducing the possibility of stray light occurring at the seventh lens, and ensuring the path accuracy of the light when passing through the last lens (i.e., the seventh lens), so as to facilitate controlling the image height of each field of view to the desired design position.

[0070] In an exemplary embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens may satisfy: 0.2 < R3 / R4 < 0.7; the axial spacing distance EP12 between the first spacer and the second spacer and the central thickness CT2 of the second lens on the optical axis may satisfy: 2 < EP12 / CT2 < 3.8. By controlling the ratio of the radius of curvature of the object side to the image side of the second lens and the ratio of the axial spacing distance between the first spacer and the second spacer to the central thickness of the second lens on the optical axis, it is possible to constrain the effective diameter size of the second lens and the edge gap between the second lens and the adjacent lens, avoiding problems such as excessive spacer thickness and easy generation of stray light on the inner surface of the spacer due to an overly large edge gap. At the same time, it can also ensure that the second lens is more easily formed and reduce the risk of stray light caused by weld lines.

[0071] In an exemplary embodiment, the effective focal length f2 of the second lens, the maximum thickness CP2 of the second spacer, and the axial spacing distance EP12 between the first spacer and the second spacer may satisfy: 15 < f2 / (CP2 + EP12) < 25. By controlling the above conditional expression, it is possible to constrain the effective focal length of the second lens and the axial spacing distance between the first spacer and the second spacer, ensuring that the optical imaging device is miniaturized and has a large field of view, avoiding problems such as distortion, difficulty in controlling the Chief Ray Angle (CRA), and low relative illumination caused by an overly small focal length and an overly large field of view of the optical imaging device, and avoiding problems such as difficulty in aberration correction due to severe bending of the second lens.

[0072] In an exemplary embodiment, the maximum thickness CP2 of the second spacer may satisfy: CP2 > 0.3 mm; 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 inner diameter d2bs of the object side of the second auxiliary spacer, and the inner diameter d2bm of the image side of the second auxiliary spacer may satisfy: 0 < d2bs / R4 + d2bm / R5 < 0.5. As an example, 0.3 mm < CP2 < 1.0 mm. By controlling the ratio of the inner diameter of the object side of the second auxiliary spacer to the radius of curvature of the image side of the second lens and the ratio of the inner diameter of the image side of the second auxiliary spacer to the radius of curvature of the object side of the third lens, and constraining the sum of these two ratios within a certain range, it is possible to effectively block the stray light rays generated by the second lens and the third lens, avoid the generation of stray light, and improve the imaging quality of the optical imaging device; at the same time, it can also reduce the surface shape deviation, distortion, and appearance problems caused by the molding of the second lens and the third lens, and improve the production yield of the second lens and the third lens.

[0073] In an exemplary embodiment, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the inner diameter d3s of the object side of the third spacer may satisfy: -10 < (f3 + f4) / d3s < -8. The air gap between the third lens and the fourth lens is the minimum value of the air gaps between adjacent two lenses among the first lens to the seventh lens. By controlling the ratio of the sum of the effective focal lengths of the third lens and the fourth lens to the inner diameter of the object side of the third spacer, it is beneficial to constrain the surface shape of the third lens and the fourth lens, so that the light rays are transmitted along a predetermined path, and the third spacer can effectively intercept the stray light that may enter the fourth lens, improving the imaging quality of the optical imaging device.

[0074] The optical imaging device according to the above embodiment of the present application may employ seven lenses and at least one spacer. By reasonably allocating the parameters of each lens and each spacer, it is possible to reduce the sensitivity of the optical imaging device, improve the stray light risk of the optical imaging device, and improve the imaging quality, assembly stability, and assembly yield of the optical imaging device.

[0075] In an embodiment of the present application, at least one of the surfaces of each of the first lens to the seventh lens is an aspherical surface. The characteristic of an aspherical lens is that the curvature changes continuously 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 improving astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality. Optionally, the object side and the image side of each of the first lens to the seventh lens are both aspherical surfaces.

[0076] A second aspect of the present application provides an optical imaging device, which includes a lens barrel, and an optical lens group and a spacer group disposed within the lens barrel. The optical lens group includes a first lens with a negative optical power, a second lens with a positive optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a positive optical power, a sixth lens with a negative optical power, and a seventh lens with a positive optical power arranged in sequence from the object side to the image side along the optical axis. The spacer group includes a first spacer disposed on and in contact with the image side surface of the first lens, and a sixth spacer disposed on and in contact with the image side surface of the sixth lens. The number of lenses with optical power in the optical imaging device can be seven.

[0077] Wherein, half of the maximum field of view angle (Semi-FOV) of the optical imaging device can satisfy: 60° < Semi-FOV < 80°; the effective full aperture DT21 of the light-transmitting portion of the object side surface of the second lens, the effective full aperture DT71 of the light-transmitting portion of the object side surface of the seventh lens, the outer diameter D1m of the image side surface of the first spacer, and the outer diameter D6m of the image side surface of the sixth spacer can satisfy: 4 < (DT71 - DT21) / (D6m - D1m) < 10. By making the optical imaging device satisfy "60° < Semi-FOV < 80°", it is beneficial to achieve the wide-angle characteristic; at the same time, by restricting (DT71 - DT21) / (D6m - D1m), the difference in the effective full aperture of the light-transmitting portions of the object side surfaces of the seventh lens and the second lens can be constrained within a reasonable range, reducing the overall step difference of the optical imaging device and minimizing the deformation amount of the lens during the assembly process; it can also limit the outer diameters of the image side surfaces of the first spacer and the sixth spacer, thereby effectively controlling the position of the light passing through the seventh lens, reducing the possibility of stray light appearing at the seventh lens, and ensuring the path accuracy of the light when passing through the last lens (i.e., the seventh lens), so as to facilitate controlling the image height of each field of view to the desired design position.

[0078] Those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses and spacers constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification.

[0079] The following further describes specific embodiments of the optical imaging device applicable to the above-described embodiments with reference to the accompanying drawings.

[0080] Example 1

[0081] The following refers to Figure 2 Describe the optical imaging device according to Embodiment 1 of the present application.

[0082] As Figure 2As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 in order from the object side to the image side along the optical axis. A stop STO is arranged between the second lens E2 and the third lens E3.

[0083] The first lens E1 has negative focal power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is convex. An optical element may also be provided between the seventh lens E7 and the imaging surface S17, and the optical element may be, for example, a filter, and the optical element has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on an imaging surface S17 (not shown).

[0084] The spacer group may include a first spacer P1, a second spacer P2, a second auxiliary spacer P2b, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a sixth auxiliary spacer P6b. In the example, the spacer group may also include a first auxiliary spacer P1b and a third auxiliary spacer P3b, wherein the first auxiliary spacer P1b is disposed on the image side of the first spacer P1 and is at least partially in contact with the image side of the first spacer P1, and the third auxiliary spacer P3b is disposed on the image side of the third spacer P3 and is at least partially in contact with the image side of the third spacer P3. The spacer may block excess light in the imaging process from entering the next lens, and at the same time, the lens and the lens barrel P0 are better supported, thereby enhancing the structural stability of the optical imaging device.

[0085] Table 2 shows the basic parameter table of the optical imaging device of Example 1, wherein the units of the radius of curvature, thickness / distance, focal length, and effective semi-aperture are all millimeters (mm).

[0086]

[0087] Table 2

[0088] In this embodiment, the total effective focal length f of the optical imaging device is 2.23 mm, the half of the maximum field of view Semi-FOV of the optical imaging device is 68.28°, and the aperture number Fno of the optical imaging device is 1.85.

[0089] In this embodiment, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0090]

[0091] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is 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 reciprocal of the curvature radius R in Table 2 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 shows 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, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0092] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.9541E-01 -3.0434E-02 1.8045E-02 -1.3573E-02 7.8268E-03 -4.1997E-03 2.1837E-03 S2 -1.4153E-01 -1.8821E-02 7.7814E-03 -3.3377E-03 6.7004E-04 -1.2969E-04 1.4813E-04 S3 -1.4750E-01 -1.5994E-02 1.1405E-03 7.2154E-04 1.2942E-04 -1.5658E-06 -1.8403E-05 S4 9.0266E-02 -2.1859E-02 -4.8156E-03 1.6733E-03 2.9358E-04 -3.3420E-04 1.6601E-04 S5 1.0149E-01 -4.6837E-03 -2.1466E-04 -5.1136E-05 -4.2022E-07 -5.1430E-06 -2.6944E-06 S6 2.8189E-01 -3.1601E-03 4.3645E-03 -8.0771E-04 2.5597E-04 -7.2515E-05 2.0036E-05 S7 4.6372E-02 9.4230E-03 -7.8648E-04 2.4404E-03 -9.0800E-04 -8.2181E-04 5.4229E-04 S8 -3.4898E-01 4.8743E-02 -6.4647E-03 1.8402E-03 -1.6031E-04 1.9586E-04 -1.8339E-04 S9 9.2366E-02 7.8165E-03 1.2725E-02 2.9156E-03 1.0591E-03 7.8100E-04 4.0756E-05 S10 2.5486E-01 -3.2263E-02 4.3252E-03 4.3095E-03 -4.1449E-05 1.4928E-03 5.8657E-04 S11 -8.5631E-02 -1.0883E-01 -7.7243E-03 1.8129E-02 -1.2755E-04 7.3786E-03 1.1992E-03 S12 2.3132E-01 5.5747E-02 -3.5410E-02 1.2851E-02 -3.9124E-03 1.5493E-03 -5.2182E-04 S13 1.9028E+00 -1.2310E-02 -3.9614E-02 2.9961E-01 -3.4263E-02 1.8218E-02 8.1806E-03 S14 2.1022E+00 -1.0174E+00 3.2851E-01 1.1971E-01 3.8335E-02 4.4774E-02 -8.6685E-02 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.1143E-03 5.2943E-04 -2.3926E-04 9.5163E-05 -2.9455E-05 6.8434E-06 0.0000E+00 S2 1.9721E-04 6.1435E-05 7.8990E-05 2.5183E-05 1.8987E-05 1.4348E-06 7.4890E-06 S3 -1.9540E-05 -6.6047E-06 -6.7727E-07 4.7530E-06 3.7244E-06 0.0000E+00 0.0000E+00 S4 -2.8595E-05 -3.9521E-05 7.0420E-05 -5.1277E-05 3.5757E-05 -2.8641E-05 2.0185E-05 S5 1.7891E-08 4.8756E-07 3.2905E-07 -9.1975E-07 4.9984E-07 0.0000E+00 0.0000E+00 S6 -1.0628E-05 4.9544E-06 -7.1077E-07 1.4180E-06 1.0704E-06 8.9440E-07 0.0000E+00 S7 -1.9454E-04 6.7177E-05 -8.8423E-05 -1.0289E-05 8.5456E-05 -7.8341E-05 3.0341E-05 S8 -2.2798E-05 -2.9903E-06 -3.8173E-06 -1.4223E-05 -5.4460E-06 4.2003E-06 3.5377E-06 S9 -8.9281E-05 4.7935E-05 4.3107E-05 -1.6469E-06 -9.7619E-06 -7.8279E-06 0.0000E+00 S10 -1.8129E-04 -6.8911E-05 1.0236E-04 6.7721E-05 7.5327E-06 2.7972E-06 -4.1837E-06 S11 -2.3025E-04 -4.6638E-04 7.3286E-04 -8.6912E-05 -1.3646E-04 5.7699E-05 -2.5476E-05 S12 1.5792E-04 -5.7191E-05 4.4834E-05 -8.8208E-06 -4.5792E-06 -1.5250E-06 0.0000E+00 S13 -2.1121E-02 9.0028E-03 1.6552E-03 -2.0347E-03 1.3858E-03 8.2333E-04 -3.6446E-04 S14 -2.6665E-03 -1.6057E-02 9.1045E-03 -2.5204E-03 -6.6202E-04 2.0277E-03 -1.4214E-03

[0093] Table 3

[0094] Example 2

[0095] The following reference Figure 3 Describe the optical imaging device according to Example 2 of the present application.

[0096] like Figure 3 As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6 and a sixth auxiliary spacer P6b. In the example, the spacer group may also include a third auxiliary spacer P3b, which is placed on the image side of the third spacer P3 and at least partially contacts the image side of the third spacer P3.

[0097] The structure of the light-transmitting portion of the optical lens group of this embodiment is the same as that of the light-transmitting portion of the optical lens group of Embodiment 1, that is, the basic parameter table of the optical imaging device of this embodiment is the same as Table 2, and the aspheric coefficient table is the same as Table 3. The difference between this embodiment and Embodiment 1 is that: the structural dimensions of at least part of the elements in the lens barrel P0 and the spacer group are different; the structural dimensions of the non-light-transmitting portion of the first lens are different.

[0098] Example 3

[0099] The following reference Figure 4 Describe the optical imaging device according to Example 3 of the present application.

[0100] like Figure 4 As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The spacer group includes a first spacer P1, a second spacer P2, a second auxiliary spacer P2b, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6 and a sixth auxiliary spacer P6b.

[0101] The structure of the light-transmitting portion of the optical lens group of this embodiment is the same as that of the light-transmitting portion of the optical lens group of Embodiment 1, that is, the basic parameter table of the optical imaging device of this embodiment is the same as Table 2, and the aspheric coefficient table is the same as Table 3. The difference between this embodiment and Embodiment 1 is that: the structural dimensions of at least part of the elements in the lens barrel P0 and the spacer group are different; the structural dimensions of the non-light-transmitting portion of the first lens are different.

[0102] Figure 5A The axial chromatic aberration curve of the optical imaging device of Example 1, 2 or 3 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging device. Figure 5B The astigmatism curve of the optical imaging device of Example 1, 2 or 3 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 5C The distortion curve of the optical imaging device of Embodiment 1, 2 or 3 is shown, which indicates the distortion magnitude value corresponding to different image heights. FIG. 5A to FIG. 5C It can be seen that the optical imaging device of Example 1, 2 or 3 can achieve good imaging quality.

[0103] Example 4

[0104] The following reference Figure 6 Describe the optical imaging device according to Example 4 of the present application.

[0105] like Figure 6As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 in order from the object side to the image side along the optical axis. A stop STO is arranged between the second lens E2 and the third lens E3.

[0106] The first lens E1 has negative focal power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is convex. An optical element may also be provided between the seventh lens E7 and the imaging surface S17, and the optical element may be, for example, a filter, and the optical element has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on an imaging surface S17 (not shown).

[0107] The spacer group may include a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a sixth auxiliary spacer P6b. The spacers can block excess light from entering the next lens during the imaging process, while allowing the lens to better support the lens barrel P0, thereby enhancing the structural stability of the optical imaging device.

[0108] Table 4 shows the basic parameter table of the optical imaging device of Example 4, wherein the units of the radius of curvature, thickness / distance, focal length, and effective semi-aperture are all millimeters (mm).

[0109]

[0110] Table 4

[0111] In this embodiment, the total effective focal length f of the optical imaging device is 2.19 mm, the half of the maximum field of view Semi-FOV of the optical imaging device is 68.70°, and the aperture number Fno of the optical imaging device is 1.79.

[0112] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 5 lists 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, A5 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0113] Face number A4 A6 A8 A10 A12 A14 A16 S1 1.8996E-01 -2.9727E-02 1.7621E-02 -1.3183E-02 7.5884E-03 -4.1237E-03 2.1650E-03 S2 -1.4721E-01 -1.6536E-02 8.5983E-03 -1.9833E-03 1.0201E-03 2.7077E-04 1.9324E-04 S3 -1.5495E-01 -1.6311E-02 1.6856E-03 8.6506E-04 1.2999E-04 1.2745E-05 -1.2716E-05 S4 9.9666E-02 -2.2323E-02 -6.6637E-03 2.2223E-03 1.6528E-04 -2.3836E-04 1.3768E-04 S5 1.0906E-01 -5.4488E-03 -2.8780E-04 -5.5193E-05 -3.3214E-06 -7.3056E-06 -1.4097E-06 S6 2.9487E-01 -2.4945E-03 4.6186E-03 -8.1105E-04 2.5978E-04 -6.6456E-05 2.0521E-05 S7 4.7135E-02 9.1071E-03 -3.5772E-04 1.9289E-03 -3.5181E-04 -1.3877E-03 1.1790E-03 S8 -3.5277E-01 4.9278E-02 -6.6192E-03 1.9193E-03 -1.6114E-04 2.4797E-04 -1.8401E-04 S9 8.9367E-02 6.6418E-03 1.1808E-02 3.0271E-03 1.0406E-03 8.4339E-04 1.6740E-04 S10 2.5335E-01 -3.2124E-02 4.3011E-03 4.3149E-03 3.0419E-05 1.2670E-03 7.3119E-04 S11 -8.6594E-02 -1.0981E-01 -4.4656E-03 1.6451E-02 1.0190E-03 6.7027E-03 7.0600E-04 S12 2.2947E-01 5.6224E-02 -3.5258E-02 1.2226E-02 -3.6029E-03 1.3831E-03 -4.6505E-04 S13 2.0331E+00 -3.9574E-02 -6.1819E-02 3.3911E-01 -4.4842E-02 8.3811E-03 1.4737E-02 S14 2.2366E+00 -1.1233E+00 3.3643E-01 1.6457E-01 1.4909E-02 3.8777E-02 -1.0535E-01 Face number A18 A20 A22 A24 A26 A28 A30 S1 -1.1123E-03 5.2534E-04 -2.3854E-04 9.4393E-05 -3.1449E-05 9.4345E-06 0.0000E+00 S2 3.5156E-04 8.4356E-05 1.4856E-04 3.9935E-05 5.6393E-05 4.1970E-06 1.9777E-05 S3 -1.6733E-05 -7.7688E-06 -6.3911E-07 4.8874E-06 4.4600E-06 0.0000E+00 0.0000E+00 S4 -2.8618E-05 -3.7119E-05 7.8398E-05 -5.8199E-05 4.3072E-05 -3.6990E-05 2.7768E-05 S5 -7.1714E-08 7.7498E-07 1.0872E-06 -1.0158E-06 8.4756E-07 0.0000E+00 0.0000E+00 S6 -8.8084E-06 4.0580E-06 3.4970E-07 1.4899E-06 5.0695E-07 1.9168E-07 5.9993E-07 S7 -6.1846E-04 2.3681E-04 -1.3062E-04 1.9604E-05 5.9734E-05 -6.0547E-05 2.7086E-05 S8 -5.8793E-05 -2.6654E-05 -8.5518E-06 -1.2573E-05 -5.1774E-06 4.0612E-06 2.7367E-06 S9 -6.7706E-05 1.6320E-05 3.2126E-05 6.2301E-06 -3.0437E-06 -5.9947E-06 0.0000E+00 S10 -2.3736E-05 -4.2208E-05 6.3919E-05 5.6140E-05 4.6062E-06 7.8523E-06 -4.0861E-06 S11 -3.6465E-04 2.2230E-05 4.1884E-04 -5.1614E-05 -8.9750E-05 1.1064E-05 -2.0013E-06 S12 1.4465E-04 -4.8001E-05 2.9545E-05 -2.1030E-06 -7.9320E-06 0.0000E+00 0.0000E+00 S13 -2.3743E-02 1.2322E-02 4.8479E-03 -3.9679E-03 1.3931E-03 8.6268E-04 -6.6765E-04 S14 3.5184E-03 -7.6647E-03 1.4527E-02 -3.3897E-03 -4.3009E-03 1.7759E-03 -1.4614E-03

[0114] Table 5

[0115] Example 5

[0116] The following reference Figure 7 Describe the optical imaging device according to Example 5 of the present application.

[0117] like Figure 7 As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The spacer group includes a first spacer P1, a second spacer P2, a second auxiliary spacer P2b, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6 and a sixth auxiliary spacer P6b.

[0118] The structure of the light-transmitting portion of the optical lens group of this embodiment is the same as that of the light-transmitting portion of the optical lens group of Embodiment 4, that is, the basic parameter table of the optical imaging device of this embodiment is the same as Table 4, and the aspheric coefficient table is the same as Table 5. The difference between this embodiment and Embodiment 4 is that: the structural dimensions of at least part of the elements in the lens barrel P0 and the spacer group are different; and the structural dimensions of the non-light-transmitting portion of the first lens are different.

[0119] Example 6

[0120] The following reference Figure 8 Describe the optical imaging device according to Example 6 of the present application.

[0121] like Figure 8As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The spacer group includes a first spacer P1, a second spacer P2, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6 and a sixth auxiliary spacer P6b. In the example, the spacer group may also include a third auxiliary spacer P3b, which is placed on the image side of the third spacer P3 and at least partially contacts the image side of the third spacer P3.

[0122] The structure of the light-transmitting portion of the optical lens group of this embodiment is the same as that of the light-transmitting portion of the optical lens group of Embodiment 4, that is, the basic parameter table of the optical imaging device of this embodiment is the same as Table 4, and the aspheric coefficient table is the same as Table 5. The difference between this embodiment and Embodiment 4 is that: the structural dimensions of at least part of the elements in the lens barrel P0 and the spacer group are different; and the structural dimensions of the non-light-transmitting portion of the first lens are different.

[0123] Fig. 9A The axial chromatic aberration curve of the optical imaging device of Example 4, 5 or 6 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging device. Fig. 9B The astigmatism curve of the optical imaging device of Example 4, 5 or 6 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig. 9C The distortion curve of the optical imaging device of Embodiment 4, 5 or 6 is shown, which indicates the distortion magnitude value corresponding to different image heights. 9A to 9C It can be seen that the optical imaging device of Example 4, 5 or 6 can achieve good imaging quality.

[0124] Example 7

[0125] The following reference Fig.10 Describe the optical imaging device according to Example 7 of the present application.

[0126] like Fig.10 As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 in order from the object side to the image side along the optical axis. A stop STO is arranged between the second lens E2 and the third lens E3.

[0127] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative focal power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has positive focal power, and its object side surface S13 is convex, and its image side surface S14 is convex. An optical element may also be provided between the seventh lens E7 and the imaging surface S17, and the optical element may be, for example, a filter, and the optical element has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from an object passes through the surfaces S1 to S16 in sequence and is finally imaged on an imaging surface S17 (not shown).

[0128] The spacer group may include a first spacer P1, a second spacer P2, a second auxiliary spacer P2b, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6, and a sixth auxiliary spacer P6b. In the example, the spacer group may further include a third auxiliary spacer P3b, which is disposed on the image side of the third spacer P3 and at least partially in contact with the image side of the third spacer P3. The spacer may block excess light from entering the next lens during the imaging process, while allowing the lens to better bear against the lens barrel P0, thereby enhancing the structural stability of the optical imaging device.

[0129] Table 6 shows the basic parameter table of the optical imaging device of Example 7, wherein the units of the radius of curvature, thickness / distance, focal length, and effective semi-aperture are all millimeters (mm).

[0130]

[0131] Table 6

[0132] In this embodiment, the total effective focal length f of the optical imaging device is 2.20 mm, the half of the maximum field of view Semi-FOV of the optical imaging device is 68.54°, and the aperture number Fno of the optical imaging device is 1.74.

[0133] In this embodiment, the object side surface and the image side surface of any lens from the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 7 lists 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 10 , A 12 , A 14 , A 16 , A18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0134]

[0135]

[0136] Table 7

[0137] Example 8

[0138] The following reference Fig.11 Describe the optical imaging device according to Example 8 of the present application.

[0139] like Fig.11 As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The spacer group includes a first spacer P1, a second spacer P2, a second auxiliary spacer P2b, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6 and a sixth auxiliary spacer P6b.

[0140] The structure of the light-transmitting portion of the optical lens group of this embodiment is the same as that of the light-transmitting portion of the optical lens group of Embodiment 7, that is, the basic parameter table of the optical imaging device of this embodiment is the same as Table 6, and the aspheric coefficient table is the same as Table 7. The difference between this embodiment and Embodiment 7 is that: the structural dimensions of at least part of the elements in the lens barrel P0 and the spacer group are different; the structural dimensions of the non-light-transmitting portion of the first lens are different.

[0141] Example 9

[0142] The following reference Fig.12 Describe the optical imaging device according to Example 9 of the present application.

[0143] like Fig.12 As shown, the optical imaging device includes a lens barrel P0 and an optical lens group and a spacer group placed in the lens barrel P0. The spacer group includes a first spacer P1, a second spacer P2, a second auxiliary spacer P2b, a third spacer P3, a fourth spacer P4, a fifth spacer P5, a sixth spacer P6 and a sixth auxiliary spacer P6b.

[0144] The structure of the light-transmitting portion of the optical lens group of this embodiment is the same as that of the light-transmitting portion of the optical lens group of Embodiment 7, that is, the basic parameter table of the optical imaging device of this embodiment is the same as Table 6, and the aspheric coefficient table is the same as Table 7. The difference between this embodiment and Embodiment 7 is that: the structural dimensions of at least part of the elements in the lens barrel P0 and the spacer group are different; the structural dimensions of the non-light-transmitting portion of the first lens are different.

[0145] Fig.13A The axial chromatic aberration curve of the optical imaging device of Example 7, 8 or 9 is shown, which indicates the deviation of the focusing point of light of different wavelengths after passing through the optical imaging device. Fig. 13B The astigmatism curve of the optical imaging device of Example 7, 8 or 9 is shown, which represents the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Fig. 13C The distortion curve of the optical imaging device of Embodiment 7, 8 or 9 is shown, which indicates the distortion magnitude value corresponding to different image heights. FIG. 13A to FIG. 13C It can be seen that the optical imaging device of Example 7, 8 or 9 can achieve good imaging quality.

[0146] Table 8 shows the values ​​of parameters such as D1m, d2bs, d2bm, d3s, d5s, d6s, d6m, D6m, d6bm, D6bm, EP01, EP12, CP2, EP45, EP56, CP6, and SAG12 in each of Examples 1 to 9. At least some of the above parameters may be calculated according to Figure 1 The units of the parameters listed in Table 8 are all mm.

[0147] Conditional / Example 1 2 3 4 5 6 7 8 9 D1m 8.040 8.000 8.300 8.220 8.040 8.340 8.260 8.000 8.300 d2bs 2.450 / 2.490 / 2.490 / 2.620 2.630 2.630 d2bm 2.450 / 2.490 / 2.490 / 2.620 2.630 2.630 d3s 2.850 2.850 2.840 2.870 2.840 2.880 2.920 3.020 2.930 d5s 3.120 3.120 3.120 3.140 3.150 3.110 3.090 3.100 3.060 d6s 5.780 5.850 5.810 5.860 5.850 5.830 5.810 5.870 5.810 d6m 7.760 7.700 7.790 7.910 7.990 7.960 7.760 7.800 7.960 D6m 9.280 8.880 9.140 8.900 8.880 9.180 9.140 8.580 9.140 d6bm 7.450 7.330 7.500 7.610 7.490 7.910 7.450 7.650 7.780 D6 10.000 9.600 9.900 9.820 9.640 9.940 9.860 9.600 9.900 EP01 1.980 2.410 2.320 2.350 2.060 2.260 2.250 2.380 2.330 EP12 1.050 1.300 0.960 1.360 1.190 1.350 1.000 0.870 0.960 CP2 0.350 0.050 0.370 0.050 0.450 0.070 0.410 0.440 0.390 EP45 0.300 0.330 0.580 0.300 0.330 0.280 0.300 0.330 0.680 EP56 1.050 1.100 2.590 1.030 1.050 1.030 0.980 1.020 0.970 CP6 1.520 1.420 1.520 1.580 1.540 1.700 1.500 1.550 1.650 SAG12 1.194 1.640 1.570 1.520 1.250 1.470 1.500 1.580 1.480

[0148] Table 8 and Table 9 show the values ​​of the conditional expressions of each embodiment in Embodiments 1 to 9.

[0149] Conditional / Example 1 2 3 4 5 6 7 8 9 EP45 / f5+EP56 / f6 -0.30 -0.31 -0.78 -0.30 -0.30 -0.30 -0.27 -0.28 -0.18 d5s / (R10-R11) -3.50 -3.50 -3.50 -3.52 -3.53 -3.48 -3.36 -3.37 -3.33 T67 / CT6 4.77 4.77 4.77 4.59 4.59 4.59 4.99 4.99 4.99 CP6 / T67 1.05 0.98 1.05 1.15 1.12 1.24 1.04 1.08 1.15 d6s / DT62 1.68 1.70 1.69 1.71 1.71 1.70 1.70 1.72 1.70 d6m / DT71 0.97 0.96 0.97 0.97 0.98 0.98 0.96 0.96 0.98 (D6bm-DT71) / d6bm 0.26 0.21 0.25 0.22 0.20 0.23 0.24 0.20 0.23 R3 / R4 0.48 0.48 0.48 0.48 0.48 0.48 0.50 0.50 0.50 EP12 / CT2 2.50 3.10 2.29 3.52 3.08 3.49 2.64 2.29 2.53 |R1 / R2| 197.20 197.20 197.20 202.66 202.66 202.66 86.02 86.02 86.02 EP01 / SAG12 1.66 1.47 1.48 1.55 1.65 1.54 1.50 1.51 1.57 d2bs / R4+d2bm / R5 0.14 / 0.14 / 0.14 / 0.16 0.16 0.16 f2 / (CP2+EP12) 18.95 19.65 19.95 18.95 16.30 18.82 19.78 21.29 20.66 (DT71-DT21) / (D6m-D1m) 4.26 6.01 6.29 7.90 6.39 6.39 5.99 9.09 6.28 (f3+f4) / d3s -9.00 -9.00 -9.03 -9.17 -9.26 -9.14 -9.11 -8.80 -9.07

[0150] Table 9

[0151] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging device described above.

[0152] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other.

Claims

1. An optical imaging device, characterized in that: Comprising: An optical lens group, including a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power, which are arranged in sequence from the object side to the image side along the optical axis; A spacer group, including a fourth spacer placed on and in contact with the image side of the fourth lens, a fifth spacer placed on and in contact with the image side of the fifth lens, and a sixth spacer placed on and in contact with the image side of the sixth lens; And A lens barrel, in which the optical lens group and the spacer group are placed; Wherein, the number of lenses with optical power in the optical imaging device is seven; Half of the maximum field of view angle Semi - FOV of the optical imaging device satisfies: 60° < Semi - FOV < 80°; The interval distance EP45 between the fourth spacer and the fifth spacer along the optical axis, the interval distance EP56 between the fifth spacer and the sixth spacer along the optical axis, the effective focal length f5 of the fifth lens, and the effective focal length f6 of the sixth lens satisfy: - 1 < EP45 / f5 + EP56 / f6 < 0.

2. The optical imaging device according to claim 1, characterized in that: The radius of curvature R10 of the image side of the fifth lens, the radius of curvature R11 of the object side of the sixth lens, and the inner diameter d5s of the object side of the fifth spacer satisfy: - 4 < d5s / (R10 - R11) < - 3.

3. The optical imaging device according to claim 1, characterized in that: The air interval T67 between the sixth lens and the seventh lens on the optical axis and the central thickness CT6 of the sixth lens on the optical axis satisfy: 4.5 < T67 / CT6 < 5; The maximum thickness CP6 of the sixth spacer and the air interval T67 between the sixth lens and the seventh lens on the optical axis satisfy: 0.9 < CP6 / T67 < 1.

3.

4. The optical imaging device according to claim 1, characterized in that: The effective full aperture DT62 of the light - transmitting part of the image side of the sixth lens and the inner diameter d6s of the object side of the sixth spacer satisfy 1.5 < d6s / DT62 < 2; The effective full aperture DT71 of the light - transmitting part of the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer satisfy: 0.9 < d6m / DT71 < 1.

5. The optical imaging device according to any one of claims 1 to 4, characterized in that: The spacer group further includes a sixth auxiliary spacer placed on and in contact with the image side of the sixth spacer; Wherein, the effective full aperture DT71 of the light - transmitting part of the object side of the seventh lens, the inner diameter d6bm of the image side of the sixth auxiliary spacer, and the outer diameter D6bm of the image side of the sixth auxiliary spacer satisfy: 0.1 < (D6bm - DT71) / d6bm < 0.

3.

6. The optical imaging device according to any one of claims 1 to 4, characterized in that: The spacer group further includes a first spacer placed on and in contact with the image side of the first lens; Among them, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 80 < |R1 / R2| < 220; the axial distance EP01 between the object side end face of the lens barrel and the first spacer along the optical axis and the axial distance SAG12 between the intersection point of the image side surface of the first lens and the optical axis and the vertex of the non-light-transmitting part of the image side surface of the first lens satisfy: 1.4 < EP01 / SAG12 < 1.

8.

7. The optical imaging device according to any one of claims 1 to 4, characterized in that: The spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; Among them, the effective full aperture DT21 of the light-transmitting part of the object side surface of the second lens, the effective full aperture DT71 of the light-transmitting part of the object side surface of the seventh lens, the outer diameter D1m of the image side surface of the first spacer and the outer diameter D6m of the image side surface of the sixth spacer satisfy: 4 < (DT71 - DT21) / (D6m - D1m) < 10.

8. The optical imaging device according to any one of claims 1 to 4, characterized in that: The spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; Among them, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 0.2 < R3 / R4 < 0.7; the axial distance EP12 between the first spacer and the second spacer along the optical axis and the central thickness CT2 of the second lens on the optical axis satisfy: 2 < EP12 / CT2 < 3.

8.

9. The optical imaging device according to any one of claims 1 to 4, characterized in that: The spacer group further includes a first spacer disposed on the image side surface of the first lens and in contact with the image side surface of the first lens and a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens; Among them, the effective focal length f2 of the second lens, the maximum thickness CP2 of the second spacer and the axial distance EP12 between the first spacer and the second spacer along the optical axis satisfy: 15 < f2 / (CP2 + EP12) < 25.

10. The optical imaging device according to any one of claims 1 to 4, characterized in that: The spacer group further includes a second spacer disposed on the image side surface of the second lens and in contact with the image side surface of the second lens and a second auxiliary spacer disposed on the image side surface of the second spacer and in contact with the image side surface of the second spacer; Among them, the maximum thickness CP2 of the second spacer satisfies: CP2 > 0.3 mm; the curvature radius R4 of the image side surface of the second lens, the curvature radius R5 of the object side surface of the third lens, the inner diameter d2bs of the object side surface of the second auxiliary spacer and the inner diameter d2bm of the image side surface of the second auxiliary spacer satisfy: 0 < d2bs / R4 + d2bm / R5 < 0.

5.

11. The optical imaging device according to any one of claims 1 to 4, characterized in that: The spacer group further includes a third spacer disposed on the image side surface of the third lens and in contact with the image side surface of the third lens; The air interval between the third lens and the fourth lens on the optical axis is smaller than the air interval between any two adjacent lenses from the first lens to the third lens on the optical axis, and smaller than the air interval between any two adjacent lenses from the fourth lens to the seventh lens on the optical axis; and The effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the inner diameter d3s of the object side surface of the third spacer satisfy: -10<(f3+f4) / d3s<-8.

Images