Optical imaging device

Abstract

The utility model discloses an optical imaging device. The optical imaging device comprises a lens barrel, a lens group and a spacing element group, wherein the lens group and the spacing element group are assembled in the lens barrel. The lens group comprises a prism, the prism comprises an incident surface, a reflecting surface and an emergent surface, the incident surface is a convex surface, and the emergent surface is a plane; the lens group further comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with negative focal power which are sequentially arranged from the prism to the image side along a second optical axis. The sixth lens has negative focal power; and the seventh lens has positive focal power. The spacing element group includes a first spacing element. The optical imaging device satisfies: 3.45 lt; f12 / flt; 4.8 and 0.9 lt; f / Rg * (d1s / dgs) lt; f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging device, Rg is the curvature radius of the incident plane of the prism, d1s is the inner diameter of the object side surface of the first spacing element, and dgs is the clear aperture of the incident plane of the prism.

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 rapid development of portable devices such as smart phones, more new requirements are put forward for the imaging functions of portable devices such as smart phones. For example, the optical imaging devices of portable devices such as smart phones need to meet the requirements of long focal length and miniaturization.

[0003] An optical imaging device may be provided with a prism. The prism increases the effective focal length of the optical imaging device by deflecting the optical path, so that while the optical imaging device meets the requirements of long focal length shooting, the total length of the optical imaging device is reduced, and the miniaturization of the optical imaging device is achieved. However, the optical imaging device including the prism has relatively high requirements for the incident light amount. Unreasonable incident light amount and the reflection of the prism on the light are likely to cause a decrease in the illuminance of the optical imaging device, thereby affecting the imaging quality 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, a lens group and a spacer element group assembled in the lens barrel. The lens group includes a prism. The prism includes an incident surface, a reflection surface and an exit surface. The incident surface is a convex surface and the exit surface is a flat surface. The prism is configured such that the light incident on the prism along the direction of the first optical axis is reflected and exits along the direction of the second optical axis, where the first optical axis is perpendicular to the second optical axis. The lens group further includes a first lens with a positive focal power, a second lens with a negative focal power, a third lens with a positive focal power, a fourth lens with a negative focal power, a fifth lens with a negative focal power, a sixth lens with a negative focal power, and a seventh lens with a positive focal power arranged in sequence from the prism to the image side along the second optical axis. The spacer element group includes a first spacer element placed on the image side surface of the first lens and in contact with the image side surface of the first lens. The optical imaging device satisfies: 3.45 < |f12| / f < 4.8 and 0.9 < f / Rg×(d1s / dgs) < 2.0, where f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging device, Rg is the curvature radius of the incident surface of the prism, d1s is the inner diameter of the object side surface of the first spacer element, and dgs is the clear aperture of the incident surface of the prism.

[0005] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element disposed on the image side of the second lens and in contact with the image side of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens; the distance EP23 between the second spacer element and the third spacer element along the second optical axis, the central thickness CT3 of the third lens on the second optical axis, the effective focal length f3 of the third lens, and the total effective focal length f of the optical imaging device satisfy: 0.4 < EP23 / CT3 × (f3 / f) < 0.8.

[0006] According to an exemplary embodiment of the present application, the spacer element group further includes a second spacer element disposed on the image side of the second lens and in contact with the image side of the second lens, and a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens; the on-axis distance Dr1r7 from the object side of the first lens to the object side of the fourth lens, the distance EP12 between the first spacer element and the second spacer element along the second optical axis, and the distance EP23 between the second spacer element and the third spacer element along the second optical axis satisfy: 1.7 < Dr1r7 / (EP12 + EP23) < 2.3.

[0007] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens; the effective focal length f5 of the fifth lens, the curvature radius R9 of the object side of the fifth lens, the outer diameter D4m of the image side of the fourth spacer element, and the curvature radius R7 of the object side of the fourth lens satisfy: 3.1 < f5 / R9 × |D4m / R7| < 5.5.

[0008] According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens; the distance EP34 between the third spacer element and the fourth spacer element along the second optical axis, the inner diameter d4s of the object side of the fourth spacer element, and the inner diameter d3m of the image side of the third spacer element satisfy: -3.1 < EP34 / (d4s - d3m) < -0.7.

[0009] According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens; the outer diameter D3s of the object side of the third spacer element, the curvature radius R7 of the object side of the fourth lens, the outer diameter D4s of the object side of the fourth spacer element, and the curvature radius R9 of the object side of the fifth lens satisfy: 2.6 < |D3s / R7| + |D4s / R9| < 3.15.

[0010] According to an exemplary embodiment of the present application, the spacer element group further includes a third spacer element disposed on the image side of the third lens and in contact with the image side of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and in contact with the image side of the fourth lens; the inner diameter d3m of the image side of the third spacer element, the perpendicular distance Yc42 from the critical point closest to the imaging surface of the optical imaging device on the image side of the fourth lens to the second optical axis, and the inner diameter d4s of the object side of the fourth spacer element satisfy: 1.25 < (d3m - Yc42) / (d4s - Yc42) < 1.5.

[0011] According to an exemplary embodiment of the present application, the spacer element group further includes a sixth spacer element disposed on the image side of the sixth lens and in contact with the image side of the sixth lens, and a seventh spacer element disposed on the image side of the seventh lens and in contact with the image side of the seventh lens; the axial distance SAG71 between the intersection of the object side of the seventh lens and the second optical axis and the vertex of the effective radius of the object side of the seventh lens, the distance EP67 along the second optical axis between the sixth spacer element and the seventh spacer element, and the central thickness CT7 of the seventh lens on the second optical axis satisfy: -1.1 < SAG71 / (EP67 / CT7) < -0.7.

[0012] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on the image side of the fifth lens and in contact with the image side of the fifth lens, and a sixth spacer element disposed on the image side of the sixth lens and in contact with the image side of the sixth lens; the effective focal length f6 of the sixth lens, the inner diameter d6s of the object side of the sixth spacer element, and the inner diameter d5m of the image side of the fifth spacer element satisfy: -35 < f6 / (d6s - d5m) < -10.9.

[0013] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on the image side of the fifth lens and in contact with the image side of the fifth lens, and a sixth spacer element disposed on the image side of the sixth lens and in contact with the image side of the sixth lens; the outer diameter D6s of the object side of the sixth spacer element, the inner diameter d5m of the image side of the fifth spacer element, the distance EP56 along the second optical axis between the fifth spacer element and the sixth spacer element, and the spacer distance T56 between the fifth lens and the sixth lens on the second optical axis satisfy: 4.8 < (D6s - d5m) / (EP56 - T56) < 9.7.

[0014] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed on and in contact with the image side surface of the sixth lens; the inner diameter d5s of the object side surface of the fifth spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, the radius of curvature R10 of the image side surface of the fifth lens, and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -0.9 < d5s / d6s × (R10 / R11) < 0.4.

[0015] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens; the effective focal length f5 of the fifth lens and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: -4.8 < f5 / d5m < -3.0.

[0016] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens; the inner diameter d5s of the object side surface of the fifth spacer element, the perpendicular distance Yc52 from the critical point closest to the imaging surface of the optical imaging device on the image side surface of the fifth lens to the second optical axis, and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 0.45 < (d5s - Yc52) / |f56| < 0.65.

[0017] According to an exemplary embodiment of the present application, the optical imaging device further includes a fixing component, the fixing component includes an inclined portion, the inclined portion extends away from the first lens from the object side end surface of the lens barrel, and is in contact with the reflecting surface of the prism, and the angle between the inclined portion and the object side end surface of the lens barrel is less than 90°.

[0018] The optical imaging device provided by the present application uses seven lenses, and reasonably configures the relationship between the combined focal length of the first lens and the second lens and the total effective focal length of the optical imaging device, and the relationship between the total effective focal length of the optical imaging device, the radius of curvature of the incident surface of the prism, the inner diameter of the object side surface of the first spacer element, and the light passing aperture of the incident surface of the prism, which is beneficial to balancing the light input amount at the front end of the optical imaging device, improving the illuminance of the optical imaging device, and further improving the imaging brightness, imaging contrast, and resolution of the optical imaging device, ensuring that the optical imaging device has good imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings. Among them:

[0020] Figure 1 Shows a parameter annotation diagram of the optical imaging device according to the present application;

[0021] Figure 2 Shows a schematic structural diagram of an optical imaging device according to Embodiment 1 of the present application;

[0022] Figure 3 Shows a schematic structural diagram of an optical imaging device according to Embodiment 2 of the present application;

[0023] Figure 4 Shows a schematic structural diagram of an optical imaging device according to Embodiment 3 of the present application;

[0024] Figures 5A to 5D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging devices according to Embodiments 1, 2, and 3 of the present application;

[0025] Figure 6 Shows a schematic structural diagram of an optical imaging device according to Embodiment 4 of the present application;

[0026] Figure 7 Shows a schematic structural diagram of an optical imaging device according to Embodiment 5 of the present application;

[0027] Figure 8 Shows a schematic structural diagram of an optical imaging device according to Embodiment 6 of the present application;

[0028] Figures 9A to 9D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging devices according to Embodiments 4, 5, and 6 of the present application;

[0029] Figure 10 Shows a schematic structural diagram of an optical imaging device according to Embodiment 7 of the present application;

[0030] Figure 11 Shows a schematic structural diagram of an optical imaging device according to Embodiment 8 of the present application;

[0031] Figure 12 Shows a schematic structural diagram of an optical imaging device according to Embodiment 9 of the present application;

[0032] Figures 13A to 13D Respectively show the axial chromatic aberration curve, astigmatism curve, distortion curve, and longitudinal chromatic aberration curve of the optical imaging devices according to Embodiments 7, 8, and 9 of the present application;

[0033] Figure 14 Shows the illuminance distribution diagram of an optical imaging device satisfying |f12| / f = 3.496 and f / Rg×(d1s / dgs) = 1.63;

[0034] Figure 15The illuminance distribution diagrams of optical imaging devices satisfying |f12| / f = 3.496 and f / Rg×(d1s / dgs) = 0.785 are shown; and

[0035] Figure 16 The illuminance distribution diagrams of optical imaging devices satisfying |f12| / f = 3.496 and f / Rg×(d1s / dgs) = 2.197 are shown. Detailed implementation manners

[0036] For a better understanding of the present application, various aspects of the present application will be described in detail 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.

[0037] In the accompanying drawings, for the sake of clarity, the thickness, size, and shape of the lenses have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0038] In this document, 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 to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0039] It should also be understood that the terms "comprise", "comprising", "have", "containing" and / or "including", 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. 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 indicate any limitation on the features.

[0040] Unless otherwise defined, all terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application pertains. The terms should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0041] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0042] The features, principles, and other aspects of the present application will be described in detail below.

[0043] Figure 1 It is a parameter annotation diagram according to an exemplary embodiment of the present application. Refer to Figure 1 , dgs represents the clear aperture of the incident surface of the prism, d1s represents the inner diameter of the object side surface of the first spacer element, d3m represents the inner diameter of the image side surface of the third spacer element, D3s represents the outer diameter of the object side surface of the third spacer element, d4s represents the inner diameter of the object side surface of the fourth spacer element, D4s represents the outer diameter of the object side surface of the fourth spacer element, d5m represents the inner diameter of the image side surface of the fifth spacer element, d5s represents the inner diameter of the object side surface of the fifth spacer element, d6s represents the inner diameter of the object side surface of the sixth spacer element, D6s represents the outer diameter of the object side surface of the sixth spacer element, SAG71 represents the axial distance between the intersection point of the object side surface of the seventh lens and the second optical axis and the vertex of the effective radius of the object side surface of the seventh lens, EP12 represents the distance between the first spacer element and the second spacer element along the second optical axis, EP23 represents the distance between the second spacer element and the third spacer element along the second optical axis, EP34 represents the distance between the third spacer element and the fourth spacer element along the second optical axis, EP56 represents the distance between the fifth spacer element and the sixth spacer element along the second optical axis, and EP67 represents the distance between the sixth spacer element and the seventh spacer element along the second optical axis.

[0044] The first aspect of the present application provides such an optical imaging device, which may include a lens group. The lens group may sequentially include a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from the object side to the image side. There may be a spacing distance, such as an air gap, between adjacent two of the first lens to the seventh lens.

[0045] In an exemplary embodiment, the prism is set at any required angle to bend the optical path. For example, the prism may be configured such that the light incident on the prism in the direction of the first optical axis is reflected and exits in the direction of the second optical axis, where the first optical axis (e.g., the Z1 axis) is perpendicular to the second optical axis (e.g., the Z2 axis).

[0046] In an exemplary embodiment, the prism may have an incident surface, a reflection surface, and an exit surface, where the incident surface is a convex surface and the exit surface is a flat surface. The light in the direction of the first optical axis enters the prism through the incident surface and is totally reflected by the reflection surface to turn towards the exit surface and exit into the first lens in the direction of the second optical axis. Wherein, the first optical axis and the second optical axis form a preset angle, for example but not limited to, the first optical axis is perpendicular to the second optical axis. And, the reflection surface passes through the intersection point of the first optical axis and the second optical axis, that is, the reflection surface is both on the first optical axis and on the second optical axis.

[0047] In an exemplary embodiment, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens may be sequentially arranged along the second optical axis from the prism to the image side.

[0048] In an exemplary embodiment, the first lens has a positive optical power. The second lens has a negative optical power. The third lens has a positive optical power. The fourth lens has a negative optical power. The fifth lens has a negative optical power. The sixth lens has a negative optical power. The seventh lens has a positive optical power.

[0049] In an exemplary embodiment, the object side surface of the first lens may be convex, and the image side surface may be convex or concave.

[0050] In an exemplary embodiment, the object side surface of the second lens may be convex or concave, and the image side surface may be concave.

[0051] In an exemplary embodiment, the object side surface of the third lens may be convex, and the image side surface may be concave.

[0052] In an exemplary embodiment, the object side surface of the fourth lens may be concave, and the image side surface may be convex.

[0053] In an exemplary embodiment, the object side surface of the fifth lens may be concave, and the image side surface may be convex.

[0054] In an exemplary embodiment, the object side surface of the sixth lens may be convex or concave, and the image side surface may be concave.

[0055] In an exemplary embodiment, the object side surface of the seventh lens may be convex, and the image side surface may be convex or concave.

[0056] In an exemplary embodiment, the optical imaging device may further include a diaphragm. The diaphragm may be disposed on the object side of the prism.

[0057] In an exemplary embodiment, the optical imaging device may further include a set of spacer elements. The set of spacer elements may include one or more of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, a sixth spacer element, and a seventh spacer element. Reasonable use of the spacer elements 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.

[0058] In an exemplary embodiment, the optical imaging device may further include a lens barrel. The lens group and the set of spacer elements are assembled in the lens barrel. Among them, the end face of the lens barrel closest to the object side is the object side end face, and the end face of the lens barrel closest to the image side is the image side end face.

[0059] In an exemplary embodiment, the optical imaging device may further include a fixing component 10. The fixing component 10 may include an inclined portion 11. The inclined portion 11 extends away from the first lens from the object-side end face of the lens barrel and contacts the reflecting surface of the prism. The angle between the inclined portion 11 and the object-side end face of the lens barrel may be less than 90°. Using the fixing component to fix the prism and the inclined portion to contact the reflecting surface of the prism can effectively change the direction of light, reduce the volume of the optical imaging device, and is beneficial to the miniaturization of the optical imaging device.

[0060] In an exemplary embodiment, the fixing component 10 may further include a limiting portion 12, and the limiting portion 12 is connected to a side of the inclined portion 11 away from the object-side end face of the lens barrel. The limiting portion 12 is used to prevent the prism from moving on the first optical axis and the second optical axis.

[0061] In an exemplary embodiment, the spacer element group may include a first spacer element, and the first spacer element may be disposed on the image side surface of the first lens and at least partially contact the image side surface of the first lens. The optical imaging device may satisfy: 3.45 < |f12| / f < 4.8 and 0.9 < f / Rg×(d1s / dgs) < 2.0, where f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging device, Rg is the radius of curvature of the incident surface of the prism, d1s is the inner diameter of the object side surface of the first spacer element, and dgs is the clear aperture of the incident surface of the prism. Reasonably configuring the relationship between the combined focal length of the first lens and the second lens and the total effective focal length of the optical imaging device, and the relationship between the total effective focal length of the optical imaging device, the radius of curvature of the incident surface of the prism, the inner diameter of the object side surface of the first spacer element, and the clear aperture of the incident surface of the prism is beneficial to balancing the light incident amount at the front end of the optical imaging device, improving the illuminance of the optical imaging device, and further improving the imaging brightness, imaging contrast, and resolution of the optical imaging device, ensuring that the optical imaging device has good imaging quality.

[0062] Table 1 shows the imaging effects of optical imaging devices (such as device 1, device 2, and device 3) under different parameter conditions. Among them, device 1 satisfies |f12| / f = 3.496 and f / Rg×(d1s / dgs) = 1.63; device 2 satisfies |f12| / f = 3.496 and f / Rg×(d1s / dgs) = 0.785; device 3 satisfies |f12| / f = 3.496 and f / Rg×(d1s / dgs) = 2.197. Figure 14 It is the illuminance distribution diagram of device 1. Figure 15 It is the illuminance distribution diagram of device 2. Figure 16 It is the illuminance distribution diagram of device 3.

[0063]

[0064] Table 1

[0065] From Figure 14 , Figure 15 and Figure 16 it can be seen that the central brightness area of Device 2 and Device 3 is small, the illuminance distribution is relatively dispersed, and the light energy distribution is relatively dispersed; however, Device 1 has a larger illuminance, and the illuminance distribution is relatively concentrated, the central brightness area is large, and the light energy distribution is relatively concentrated. It can be seen that by controlling the optical imaging device to satisfy 3.45 < |f12| / f < 4.8 and 0.9 < f / Rg×(d1s / dgs) < 2.0, it is beneficial to improve the illuminance of the optical imaging device, thereby improving the imaging brightness, imaging contrast, and resolution of the optical imaging device, and ensuring that the optical imaging device has good imaging quality.

[0066] In an exemplary embodiment, the spacer element group may include a second spacer element and a third spacer element. The second spacer element may be placed on the image side of the second lens and at least partially in contact with the image side of the second lens. The third spacer element may be placed on the image side of the third lens and at least partially in contact with the image side of the third lens. The distance EP23 of the second spacer element and the third spacer element along the second optical axis, the central thickness CT3 of the third lens on the second optical axis, the effective focal length f3 of the third lens, and the total effective focal length f of the optical imaging device may satisfy: 0.4 < EP23 / CT3×(f3 / f) < 0.8. By controlling the above conditional formula, the distance of the second spacer element and the third spacer element along the second optical axis can be restricted, so that the second spacer element and the third spacer element effectively block stray light. At the same time, by cooperating with restricting the central thickness of the third lens, the effective focal length of the third lens, and the total effective focal length of the optical imaging device, the problem of stress concentration of the third lens caused by a large difference in the bearing positions of the third lens when assembled with the second and third spacer elements can be avoided, and the assembly stability of the optical imaging device can be improved.

[0067] In an exemplary embodiment, the spacer element group may include a second spacer element and a third spacer element. The second spacer element may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The third spacer element may be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The on-axis distance Dr1r7 from the object side of the first lens to the object side of the fourth lens, the distance EP12 between the first spacer element and the second spacer element along the second optical axis, and the distance EP23 between the second spacer element and the third spacer element along the second optical axis may satisfy: 1.7 < Dr1r7 / (EP12 + EP23) < 2.3. By controlling the above conditional expression, the on-axis distance from the object side of the first lens to the object side of the fourth lens can be constrained, effectively improving the performance of the optical imaging device. At the same time, by coordinating with restricting the distance between the first spacer element and the second spacer element along the second optical axis and the distance between the second spacer element and the third spacer element along the second optical axis, the spacing distance between the third lens and the fourth lens can be made reasonable, improving the assembly stability of the optical imaging device.

[0068] In an exemplary embodiment, the spacer element group may include a fourth spacer element. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The effective focal length f5 of the fifth lens, the radius of curvature R9 of the object side of the fifth lens, the outer diameter D4m of the image side of the fourth spacer element, and the radius of curvature R7 of the object side of the fourth lens may satisfy: 3.1 < f5 / R9 × |D4m / R7| < 5.5. By controlling the above conditional expression, the outer diameter size of the image side of the fourth spacer element can be constrained within a reasonable range, enabling the fourth spacer element to effectively block stray light, improving the performance of the optical imaging device, and avoiding the problem of light leakage in the non-effective diameter region of the fourth lens caused by too small an outer diameter of the image side of the fourth spacer element, or avoiding the problem of easy deformation of the fourth spacer element during assembly caused by too large an outer diameter of the image side of the fourth spacer element.

[0069] In an exemplary embodiment, the spacer element group may include a fifth spacer element. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The effective focal length f5 of the fifth lens and the inner diameter d5m of the image side of the fifth spacer element may satisfy: -4.8 < f5 / d5m < -3.0. By controlling the above conditional expression, the effective focal length of the fifth lens can be constrained within a reasonable range, reducing the distortion of the optical imaging device, and ensuring that the chief ray exit angle of the optical imaging device is at a reasonable level, improving the relative illumination of the optical imaging device; at the same time, it can also constrain the bending degree of the fifth lens, which is beneficial for correcting aberrations.

[0070] In an exemplary embodiment, the spacer element group may include a fifth spacer element, and the fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The inner diameter d5s of the object side of the fifth spacer element, the perpendicular distance Yc52 from the critical point closest to the imaging surface of the optical imaging device on the image side of the fifth lens to the second optical axis, and the combined focal length f56 of the fifth lens and the sixth lens may satisfy: 0.45 < (d5s - Yc52) / |f56| < 0.65. When the combined focal length of the fifth lens and the sixth lens is small, the speed at which light converges to the focal point is faster, and the requirements for the size, surface profile, and surface quality tolerance levels of the fifth lens and the sixth lens are higher. Small deviations are likely to cause the shift of the focal point, thereby affecting the imaging clarity and quality. By controlling the above conditional expression, the combined focal length of the fifth lens and the sixth lens can be constrained within a reasonable range, and the shape of the image side of the fifth lens can be restricted, effectively balancing the imaging requirements of the optical imaging device and the system tolerance.

[0071] In an exemplary embodiment, the spacer element group may include a sixth spacer element and a seventh spacer element. The sixth spacer element may be disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens, and the seventh spacer element may be disposed on the image side of the seventh lens and at least partially in contact with the image side of the seventh lens. The axial distance SAG71 between the intersection point of the object side of the seventh lens and the second optical axis and the vertex of the effective radius of the object side of the seventh lens, the distance EP67 along the second optical axis between the sixth spacer element and the seventh spacer element, and the central thickness CT7 of the seventh lens on the second optical axis may satisfy: -1.1 < SAG71 / (EP67 / CT7) < -0.7. By controlling the above conditional expression, it is beneficial to balance the central thickness of the seventh lens and the maximum thickness of the seventh spacer element, avoid too large a difference in their thicknesses, ensure good assembly stability and assembly yield of the seventh lens and the seventh spacer element, and indirectly limit the ratio of the central thickness to the edge thickness of the seventh lens, avoiding the problem of weld lines being easily generated during molding due to too large a difference between the central thickness and the edge thickness of the seventh lens.

[0072] In an exemplary embodiment, the spacer element group may include a fifth spacer element and a sixth spacer element. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The sixth spacer element may be disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. The effective focal length f6 of the sixth lens, the inner diameter d6s of the object side of the sixth spacer element, and the inner diameter d5m of the image side of the fifth spacer element may satisfy: -35 < f6 / (d6s - d5m) < -10.9. By controlling the above conditional expression, the difference between the inner diameter of the object side of the sixth spacer element and the inner diameter of the image side of the fifth spacer element can be constrained within a reasonable range, so that the fifth spacer element and the sixth spacer element effectively block stray light, and improve the performance of the optical imaging device, avoiding the problem of light leakage in the non-effective diameter region of the object side of the sixth lens caused by too small a difference, or avoiding the problem of light leakage in the non-effective diameter region of the image side of the sixth lens caused by too large a difference.

[0073] In an exemplary embodiment, the spacer element group may further include a fifth spacer element and a sixth spacer element. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The sixth spacer element may be disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. The outer diameter D6s of the object side of the sixth spacer element, the inner diameter d5m of the image side of the fifth spacer element, the distance EP56 between the fifth spacer element and the sixth spacer element along the second optical axis, and the spacing distance T56 between the fifth lens and the sixth lens on the second optical axis may satisfy 4.8 < (D6s - d5m) / (EP56 - T56) < 9.7. By controlling the above conditional expression, the difference between the distance between the fifth spacer element and the sixth spacer element along the second optical axis and the spacing distance between the fifth lens and the sixth lens on the second optical axis can be constrained within a reasonable range, indirectly restricting the ratio of the central thickness to the edge thickness of the fifth lens, and avoiding the problem of weld lines being easily generated during molding due to too large a difference between the central thickness and the edge thickness of the fifth lens.

[0074] In an exemplary embodiment, the spacer element group may include a third spacer element and a fourth spacer element. The third spacer element may be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The distance EP34 between the third spacer element and the fourth spacer element along the second optical axis, the inner diameter d4s of the object side of the fourth spacer element, and the inner diameter d3m of the image side of the third spacer element may satisfy: -3.1 < EP34 / (d4s - d3m) < -0.7. By controlling the above conditional expression, the inner diameter of the image side of the third spacer element can be constrained within a reasonable range, which is beneficial to controlling the light path in the non-effective diameter part of the fourth lens, reducing stray light, improving the imaging quality of the optical imaging device, avoiding the problem of blocking too many effective light rays and affecting the imaging quality caused by too small an inner diameter of the image side of the third spacer element, or avoiding the problem of too much stray light caused by too large an inner diameter of the image side of the third spacer element.

[0075] In an exemplary embodiment, the spacer element group may include a fifth spacer element and a sixth spacer element. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The sixth spacer element may be disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. The inner diameter d5s of the object side of the fifth spacer element, the inner diameter d6s of the object side of the sixth spacer element, the curvature radius R10 of the image side of the fifth lens, and the curvature radius R11 of the object side of the sixth lens may satisfy: -0.9 < d5s / d6s × (R10 / R11) < 0.4. Reasonably configuring the relationship between the inner diameter of the object side of the fifth spacer element, the inner diameter of the object side of the sixth spacer element, the curvature radius of the image side of the fifth lens, and the curvature radius of the object side of the sixth lens can effectively constrain the curvature radii of the image side of the fifth lens and the object side of the sixth lens, and effectively balance the coma and astigmatism at the rear end of the optical imaging device.

[0076] In an exemplary embodiment, the spacer element group may include a third spacer element and a fourth spacer element. The third spacer element may be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The outer diameter D3s of the object side of the third spacer element, the curvature radius R7 of the object side of the fourth lens, the outer diameter D4s of the object side of the fourth spacer element, and the curvature radius R9 of the object side of the fifth lens may satisfy: 2.6 < |D3s / R7| + |D4s / R9| < 3.15. By controlling the above conditional expression, the outer diameters of the object sides of the third spacer element and the fourth spacer element can be constrained within a reasonable range, ensuring that the wall thickness of the corresponding part of the lens barrel for the third spacer element and the fourth spacer element is relatively uniform, improving the reliability of the optical imaging device, and avoiding problems such as excessive difference in the lens barrel gear positions, non-uniform lens barrel wall thickness, and easy performance failure of the optical imaging device during the reliability test due to too large a difference in the outer diameters of the object sides of the third spacer element and the fourth spacer element, or avoiding problems such as inability to measure the lens barrel gear position and difficulty in incoming material control of the lens barrel due to too small a difference in the outer diameters of the object sides of the third spacer element and the fourth spacer element.

[0077] In an exemplary embodiment, the spacer element group may include a third spacer element and a fourth spacer element. The third spacer element may be disposed on the image side of the third lens and at least partially in contact with the image side of the third lens. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The inner diameter d3m of the image side of the third spacer element, the perpendicular distance Yc42 from the critical point closest to the imaging surface of the optical imaging device on the image side of the fourth lens to the second optical axis, and the inner diameter d4s of the object side of the fourth spacer element may satisfy: 1.25 < (d3m - Yc42) / (d4s - Yc42) < 1.5. By controlling the above conditional expression, the inner diameter of the object side of the fourth spacer element can be constrained within a reasonable range, restricting the direction of the light rays emitted from the edge of the effective diameter of the fourth lens, reducing stray light, improving the imaging quality of the optical imaging device, and avoiding problems such as light leakage due to too large an inner diameter of the object side of the fourth spacer element, or avoiding problems such as blocking some effective light rays, too few effective light rays entering the fifth lens, and affecting the imaging quality of the optical imaging device due to too small an inner diameter of the object side of the fourth spacer element.

[0078] The optical imaging device according to the above embodiment of the present application may employ seven lenses, one prism, and at least one spacer element. By reasonably allocating the parameters of each lens, prism, each spacer element, and the lens barrel, miniaturization and long focal length of the optical imaging device can be achieved, the stray light risk of the optical imaging device can be reduced, and the assembly stability and imaging quality of the optical imaging device can be improved.

[0079] 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 as much as possible the aberration that occurs during imaging, thereby improving the imaging quality.

[0080] The second aspect of the present application provides an optical imaging device, which includes a lens barrel, a lens group, and a spacer element group. The spacer element group and the lens group are assembled in the lens barrel. The lens group includes a prism, the prism includes an incident surface, an exit surface, and a reflection surface, its incident surface is a convex surface, the exit surface is a plane, and the prism is configured such that the light incident along the direction of the first optical axis is reflected and exits along the direction of the second optical axis, wherein the first optical axis is perpendicular to the second optical axis. The lens group further includes a first lens with a focal power, a second lens with a focal power, a third lens with a positive focal power, a fourth lens with a negative focal power, a fifth lens with a focal power, a sixth lens with a focal power, and a seventh lens with a focal power arranged in sequence from the prism to the image side along the second optical axis. The spacer element group includes a second spacer element placed on the image side surface of the second lens and in contact with the image side surface of the second lens, and a third spacer element placed on the image side surface of the third lens and in contact with the image side surface of the third lens.

[0081] The optical imaging device satisfies: 3.45 < |f12| / f < 4.8 and 0.4 < EP23 / CT3×(f3 / f) < 0.8; f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging device, EP23 is the distance between the second spacer element and the third spacer element along the second optical axis, CT3 is the central thickness of the third lens on the second optical axis, and f3 is the effective focal length of the third lens. By controlling the above conditional formula, the distance between the second spacer element and the third spacer element along the second optical axis can be constrained within a reasonable range, so that the second spacer element and the third spacer element effectively block stray light. At the same time, by cooperating with restricting the central thickness of the third lens, the effective focal length of the third lens, and the total effective focal length of the optical imaging device, the problem of stress concentration of the third lens caused by a large difference in the bearing positions of the third lens when assembled with the second and third spacer elements can be avoided, and the assembly stability of the optical imaging device can be improved.

[0082] 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 system can be changed to obtain the various results and advantages described in this specification.

[0083] The following further describes specific embodiments of the optical system applicable to the above embodiments with reference to the accompanying drawings.

[0084] Example 1

[0085] The following refers to Figure 2 Describe an optical imaging device according to Embodiment 1 of the present application.

[0086] As Figure 2 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0087] The lens group includes a prism Eg, 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 arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12.

[0088] The lens group further includes a prism Eg, whose incident surface P1 is convex, the reflecting surface P2 is flat, and the exit surface P3 is flat. The prism Eg is configured such that the light incident along the first optical axis Z1 through the incident surface S0 is reflected by the reflecting surface and exits in the direction of the second optical axis Z2, where the first optical axis Z1 and the second optical axis Z2 are perpendicular. The first lens has a positive focal power, its object side surface S1 is convex, and its image side surface S2 is convex. The second lens has a negative focal power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens has a positive focal power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens has a negative focal power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has a negative focal power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens has a negative focal power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens has a positive focal power, its object side surface S13 is convex, and its image side surface S14 is concave. The optical imaging device may further include a filter disposed on the image side of the seventh lens. The filter has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S0 to S16 and finally forms an image on the imaging surface S17.

[0089] Table 2 shows the basic parameter table of the lens group in Embodiment 1, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0090]

[0091]

[0092] Table 2

[0093] In this embodiment, the total effective focal length f of the optical imaging device is 15.51 mm, the combined focal length f12 of the first lens and the second lens is -72.38 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -8.22 mm.

[0094] In this embodiment, the object side surface S1 of the first lens E1 to the image side surface S14 of the seventh lens E7 are all aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0095]

[0096] where X is the sagitta, the distance from the vertex of the aspherical surface along the optical axis at a position with a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 gives the higher-order coefficients A4, A6, A8, A 10 、A 12 、A 14 、A 16 、A 18 and A 20 .

[0097] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.0914E-01 2.9662E-03 -1.4492E-03 9.7888E-04 4.4146E-04 4.0447E-04 -5.1672E-04 -2.9024E-04 -2.6543E-05 S2 7.3634E-02 -1.8488E-02 7.1721E-04 6.2819E-04 1.3386E-03 7.7386E-04 -1.1109E-03 -1.8690E-04 -3.3268E-06 S3 -1.2754E-01 3.3411E-02 -8.8506E-03 1.1594E-03 -3.1789E-05 -1.9360E-05 5.7500E-05 -5.6523E-04 -1.2724E-04 S4 -1.9407E-01 4.2250E-02 -2.8099E-03 1.4326E-03 3.1180E-04 1.7428E-04 5.2640E-04 1.3673E-04 -2.4615E-04 S5 -3.2234E-02 6.0004E-03 2.1311E-03 4.4120E-04 1.1430E-03 1.3754E-03 -6.4713E-04 2.2701E-05 -3.2421E-04 S6 7.5948E-02 9.1818E-03 -8.4226E-03 -3.0782E-04 1.4682E-04 1.4268E-03 2.7883E-04 1.7504E-04 9.9702E-05 S7 1.3814E-02 -1.7375E-02 -9.1235E-04 1.8542E-04 -9.8271E-04 1.0662E-03 5.1977E-04 2.6062E-04 1.2563E-04 S8 -7.8345E-02 -1.9652E-02 -6.8096E-03 1.1418E-03 -2.5422E-04 4.2864E-05 1.7111E-04 -1.7968E-05 1.4208E-05 S9 1.6651E-02 6.2871E-02 -1.7799E-02 -2.2844E-03 3.6944E-03 -3.3110E-04 7.6420E-04 1.6782E-05 -1.2322E-05 S10 -4.7914E-01 1.9204E-02 -4.1125E-03 -1.0698E-02 2.4721E-03 -2.8290E-03 7.8364E-04 -1.0380E-04 -1.4722E-04 S11 2.4016E-01 -7.9537E-02 3.2009E-02 -1.7644E-03 1.2921E-03 -1.1519E-03 3.6524E-04 1.6987E-04 -9.5929E-05 S12 3.4877E-01 -6.0111E-02 1.0846E-02 3.4075E-03 1.0322E-04 4.0231E-05 7.1520E-05 1.8732E-04 -9.0286E-05 S13 2.2087E-01 -3.3182E-03 7.1436E-04 1.3359E-03 -4.6950E-04 2.0266E-04 -1.1274E-04 7.2997E-05 -1.3626E-05 S14 2.2495E-01 1.7765E-02 7.7945E-03 8.3479E-04 -8.6095E-04 1.0054E-04 -1.9041E-04 3.4903E-05 -4.0664E-05

[0098] Table 3

[0099] Example 2

[0100] The following refers to Figure 3 to describe the optical imaging device according to Embodiment 2 of the present application.

[0101] As Figure 3 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0102] The lens group includes a prism Eg, 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, which are arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12. The optical imaging device may further include a filter (not shown) disposed on the image side of the seventh lens. The filter (not shown) has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S0 to S16 and finally forms an image on the imaging surface S17.

[0103] The structure of the lens group in this embodiment is the same as that of the lens group in Embodiment 1. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 2, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 3.

[0104] The difference between this embodiment and Embodiment 1 lies in that the structural dimensions of the lens barrel and some spacer elements, the spacing of some spacer elements in the optical axis direction, and other parameters are different. The numerical values of multiple parameters of the lens barrel and spacer elements included in the optical imaging devices of this embodiment and Embodiment 1 are shown in Table 8 below.

[0105] Example 3

[0106] The following refers to Figure 4 Describe the optical imaging device according to Embodiment 3 of the present application.

[0107] As Figure 4 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0108] The lens group includes a prism Eg, 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, which are arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12. The optical imaging device may further include a filter (not shown) disposed on the image side of the seventh lens. The filter (not shown) has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S0 to S16 and finally forms an image on the imaging surface S17.

[0109] The structure of the lens group in this embodiment is the same as that of the lens group in Embodiment 1. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 2, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 3.

[0110] The difference between this embodiment and Embodiment 1 lies in that the structural dimensions of the lens barrel and some spacer elements, the spacing of some spacer elements in the optical axis direction, and other parameters are different. The numerical values of multiple parameters of the lens barrel and spacer elements included in the optical imaging devices of this embodiment and Embodiment 1 are shown in Table 8 below.

[0111] Figure 5A The axial chromatic aberration curves of the optical imaging devices of Embodiments 1, 2, and 3 are shown, which represent the deviation of the focusing points of light rays of different wavelengths after passing through the optical imaging device. Figure 5B The astigmatism curves of the optical imaging devices of Embodiments 1, 2, and 3 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 5C The distortion curves of the optical imaging devices of Embodiments 1, 2, and 3 are shown, which represent the distortion magnitude values corresponding to different image heights. Figure 5D The modulation transfer function curves of the optical imaging devices of Embodiments 1, 2, and 3 are shown. According to Figures 5A to 5D It can be seen that the optical imaging devices given in Embodiments 1, 2, and 3 can achieve good imaging quality.

[0112] Example 4

[0113] The following refers to Figure 6 Describe the optical imaging device according to Embodiment 4 of the present application.

[0114] As Figure 6 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0115] The lens group includes a prism Eg, 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, which are arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12.

[0116] The lens group further includes a prism Eg, whose incident surface is convex, reflection surface is flat, and exit surface is flat. The prism Eg is configured such that light incident through the incident surface S0 along the first optical axis Z1 is reflected by the reflection surface and exits in the direction of the second optical axis Z2, where the first optical axis Z1 and the second optical axis Z2 are perpendicular. The first lens has a positive optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has a negative optical power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens has a negative optical power, its object side surface S11 is concave, and its image side surface S12 is concave. The seventh lens has a positive optical power, its object side surface S13 is convex, and its image side surface S14 is convex. The optical imaging device may further include a filter disposed on the image side of the seventh lens. The filter has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S0 to S16 and finally forms an image on the imaging surface S17.

[0117] Table 4 shows the basic parameter table of the lens group in Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0118]

[0119] Table 4

[0120] In this embodiment, the total effective focal length f of the optical imaging device takes a value of 18.00 mm, the combined focal length f12 of the first lens and the second lens takes a value of -62.93 mm, and the combined focal length f56 of the fifth lens and the sixth lens takes a value of -5.84 mm.

[0121] In this embodiment, the object side surface S1 of the first lens E1 to the image side surface S14 of the seventh lens E7 are all aspherical surfaces. Table 5 gives the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 that can be used for each of the aspherical mirror surfaces S1 to S14 in Embodiment 4.

[0122]

[0123]

[0124] Table 5

[0125] Example 5

[0126] The following refers to Figure 7 to describe the optical imaging device according to Embodiment 5 of the present application.

[0127] As Figure 7 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0128] The lens group includes a prism Eg, 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 arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12. The optical imaging device may further include a filter (not shown) disposed on the image side of the seventh lens. The filter (not shown) has an object side surface S15 and an image side surface S16. Light from the object passes through each surface S0 to S16 in sequence and finally forms an image on the imaging surface S17.

[0129] The structure of the lens group in this embodiment is the same as that of the lens group in Embodiment 4, that is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 4, and the higher-order term coefficient table of the aspherical mirror surface is the same as Table 5.

[0130] The difference between this embodiment and Embodiment 4 lies in that the structural dimensions of the lens barrel and some spacer elements, and the distances of some spacer elements along the optical axis direction and other parameters are different. The numerical values of multiple parameters of the lens barrel and spacer elements included in the optical imaging device of this embodiment and Embodiment 4 are as shown in Table 8 later.

[0131] Example 6

[0132] The following refers to Figure 8 Describe the optical imaging device according to Embodiment 6 of the present application.

[0133] As Figure 8 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0134] The lens group includes a prism Eg, 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 arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be provided between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12. The optical imaging device may further include a filter (not shown) disposed on the image side of the seventh lens. The filter (not shown) has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through the surfaces S0 to S16 and finally forms an image on the imaging surface S17.

[0135] The structure of the lens group in this embodiment is the same as that of the lens group in Embodiment 4, that is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 4, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 5.

[0136] The difference between this embodiment and Embodiment 4 lies in that the structural dimensions of the lens barrel and some spacer elements, the spacing of some spacer elements in the optical axis direction, and other parameters are different. The numerical values of multiple parameters of the lens barrel and spacer elements included in the optical imaging devices of this embodiment and Embodiment 4 are as shown in Table 8 below.

[0137] Figure 9A The axial chromatic aberration curves of the optical imaging devices of Embodiments 4, 5, and 6 are shown, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging device. Figure 9B The astigmatism curves of the optical imaging devices of Embodiments 4, 5, and 6 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 9C The distortion curves of the optical imaging devices of Embodiments 4, 5, and 6 are shown, which represent the distortion magnitude values corresponding to different image heights. Figure 9D The modulation transfer function curves of the optical imaging devices of Embodiments 4, 5, and 6 are shown. According to Figures 9A to 9DIt can be seen that the optical imaging devices given in Embodiments 4, 5, and 6 can achieve good imaging quality.

[0138] Example 7

[0139] The following refers to Figure 10 and describes the optical imaging device according to Embodiment 7 of the present application.

[0140] As Figure 10 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0141] The lens group includes a prism Eg, 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 arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12.

[0142] The lens group further includes a prism Eg, whose incident surface is convex, the reflecting surface is flat, and the exit surface is flat. The prism Eg is configured such that the light incident along the first optical axis Z1 through the incident surface S0 is reflected by the reflecting surface and exits in the direction of the second optical axis Z2, where the first optical axis Z1 and the second optical axis Z2 are perpendicular. The first lens has a positive optical power, its object side surface S1 is convex, and its image side surface S2 is convex. The second lens has a negative optical power, its object side surface S3 is concave, and its image side surface S4 is concave. The third lens has a positive optical power, its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens has a negative optical power, its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens has a negative optical power, its object side surface S9 is concave, and its image side surface S10 is convex. The sixth lens has a negative optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens has a positive optical power, its object side surface S13 is convex, and its image side surface S14 is concave. The optical imaging device may further include a filter disposed on the image side of the seventh lens. The filter has an object side surface S15 and an image side surface S16. The light from the object sequentially passes through the surfaces S0 to S16 and finally forms an image on the imaging surface S17.

[0143] Table 6 shows the basic parameter table of the lens group of Embodiment 7, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0144]

[0145]

[0146] Table 6

[0147] In this embodiment, the total effective focal length f of the optical imaging device is 12.00 mm, the combined focal length f12 of the first lens and the second lens is -56.95 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -7.08 mm.

[0148] In this embodiment, the object side surface S1 of the first lens E1 to the image side surface S14 of the seventh lens E7 are all aspherical surfaces. Table 7 gives the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , and A 20 that can be used for each of the aspherical mirror surfaces S1 to S14 in Embodiment 7.

[0149]

[0150] Table 7

[0151] Example 8

[0152] The following refers to Figure 11 to describe the optical imaging device according to Embodiment 8 of the present application.

[0153] As Figure 11 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0154] The lens group includes a prism Eg, 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 arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing assembly 10, and the fixing assembly 10 may further include an inclined portion 11 and a limiting portion 12. The optical imaging device may further include a filter (not shown) disposed on the image side of the seventh lens. The filter (not shown) has an object side surface S15 and an image side surface S16. Light from the object sequentially passes through each surface S0 to S16 and finally forms an image on the imaging surface S17.

[0155] The structure of the lens group in this embodiment is the same as that of the lens group in Embodiment 7. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 6, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 7.

[0156] The difference between this embodiment and Embodiment 7 lies in that the structural dimensions of the lens barrel and some spacer elements, the spacing of some spacer elements along the optical axis direction and other parameters are different. The numerical values of multiple parameters of the lens barrel and spacer elements included in the optical imaging devices of this embodiment and Embodiment 7 are shown in Table 8 below.

[0157] Example 9

[0158] The following refers to Figure 12 Describe the optical imaging device according to Embodiment 9 of the present application.

[0159] As Figure 12 shown, the optical imaging device may include a lens barrel, a lens group, and a spacer element group.

[0160] The lens group includes a prism Eg, 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 arranged in sequence from the object side to the image side along the second optical axis. The spacer element group may include a first spacer element group P1, a second spacer element group P2, a third spacer element group P3, a fourth spacer element group P4, a fifth spacer element group P5, a sixth spacer element group P6, and a seventh spacer element group P7. An aperture STO (not shown) may be disposed between the object side and the incident surface S0 of the prism Eg. The optical imaging device may include a fixing component 10, and the fixing component 10 may further include an inclined portion 11 and a limiting portion 12. The optical imaging device may further include a filter (not shown) disposed on the image side of the seventh lens. The filter (not shown) has an object side surface S15 and an image side surface S16. Light from the object passes through the surfaces S0 to S16 in sequence and finally forms an image on the imaging surface S17.

[0161] The structure of the lens group in this embodiment is the same as that of the lens group in Embodiment 7. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 6, and the high-order term coefficient table of the aspherical mirror surface is the same as Table 7.

[0162] The difference between this embodiment and Embodiment 7 lies in that the structural dimensions of the lens barrel and some spacer elements, the spacing of some spacer elements along the optical axis direction and other parameters are different. The numerical values of multiple parameters of the lens barrel and spacer elements included in the optical imaging devices of this embodiment and Embodiment 7 are shown in Table 8 below.

[0163] Figure 13A Shows the axial chromatic aberration curves of the optical imaging devices of Embodiments 7, 8, and 9, which represent the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging device.Figure 13B The astigmatism curves of the optical imaging devices of Examples 7, 8, and 9 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature corresponding to different image heights. Figure 13C The distortion curves of the optical imaging devices of Examples 7, 8, and 9 are shown, which represent the distortion magnitude values corresponding to different image heights. Figure 13D The modulation transfer function curves of the optical imaging devices of Examples 7, 8, and 9 are shown. According to Figures 13A to 13D it can be known that the optical imaging devices given in Examples 7, 8, and 9 can achieve good imaging quality.

[0164] Table 8 shows the values of the parameters d1s, d3m, D3s, d4s, D4s, D4m, d5s, d5m, d6s, D6s, EP12, EP23, EP34, EP56, EP67, dgs, SAG71, Yc42, and Yc52 for each of Examples 1 to 9. Among them, at least some of the parameters can be measured according to Figure 1 the marking method shown, and the units of the parameters listed in Table 8 are all mm.

[0165]

[0166]

[0167] Table 8

[0168] In summary, the conditions in Examples 1 to 9 satisfy the relationships shown in Table 9.

[0169] Conditional / Example 1 2 3 4 5 6 7 8 9 |f12| / f 4.667 4.667 4.667 3.496 3.496 3.496 4.746 4.746 4.746 EP23 / CT3×(f3 / f) 0.690 0.754 0.572 0.610 0.438 0.438 0.687 0.515 0.408 Dr1r7 / (EP12 + EP23) 1.822 1.750 2.001 1.842 2.276 2.276 1.909 2.206 2.227 SAG71 / (EP67 / CT7) -1.085 -1.085 -1.085 -0.730 -0.720 -0.730 -1.094 -1.094 -0.964 f5 / R9×|D4m / R7| 5.414 4.090 4.189 5.051 5.295 5.404 4.294 4.314 3.159 f6 / (d6s - d5m) -33.163 -29.496 -29.496 -14.325 -10.949 -14.325 -30.012 -30.012 -34.422 (D6s - d5m) / (EP56 - T56) 5.607 5.175 4.843 7.628 9.664 8.820 5.183 5.239 5.854 f / Rg×(d1s / dgs) 1.920 1.906 1.899 1.637 1.630 1.637 0.905 0.927 0.905 EP34 / (d4s - d3m) -1.956 -2.214 -1.908 -3.087 -2.488 -1.828 -1.750 -0.741 -1.532 d5s / d6s×(R10 / R11) -0.839 -0.831 -0.831 0.363 0.349 0.363 -0.846 -0.846 -0.856 f5 / d5m -4.108 -4.150 -4.150 -4.527 -4.721 -4.527 -3.016 -3.016 -3.016 |D3s / R7| + |D4s / R9| 2.981 2.634 2.635 2.766 2.900 2.915 3.118 3.119 2.661 (d3m - Yc42) / (d4s - Yc42) 1.372 1.290 1.397 1.306 1.421 1.444 1.331 1.456 1.418 (d5s - Yc52) / |f56| 0.472 0.465 0.465 0.609 0.575 0.609 0.519 0.519 0.519

[0170] Table 9

[0171] The above description is only for the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the application concept. For example, the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An optical imaging device, comprising a lens barrel, and a lens group and a spacer element group assembled in the lens barrel, wherein the lens group includes a prism, the prism includes an incident surface, a reflection surface and an exit surface, the incident surface is a convex surface, and the exit surface is a flat surface; the prism is configured such that light incident on the prism in the direction of a first optical axis exits in the direction of a second optical axis after reflection, wherein the first optical axis is perpendicular to the second optical axis; the lens group further includes a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, a fifth lens with a negative optical power, a sixth lens with a negative optical power, and a seventh lens with a positive optical power, which are sequentially arranged from the prism to the image side along the second optical axis; the spacer element group includes a first spacer element disposed on and in contact with the image side surface of the first lens; wherein, the number of lenses with optical power in the optical imaging device is seven; the optical imaging device satisfies: 3.45 < |f12| / f < 4.8 and 0.9 < f / Rg × (d1s / dgs) < 2.0; wherein, f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging device, Rg is the radius of curvature of the incident surface of the prism, d1s is the inner diameter of the object side surface of the first spacer element, and dgs is the clear aperture of the incident surface of the prism.

2. The optical imaging device according to claim 1, wherein the spacer element group further includes a second spacer element disposed on and in contact with the image side surface of the second lens and a third spacer element disposed on and in contact with the image side surface of the third lens; the distance EP23 along the second optical axis between the second spacer element and the third spacer element, the central thickness CT3 of the third lens on the second optical axis, and the effective focal length f3 of the third lens and the total effective focal length f of the optical imaging device satisfy: 0.4 < EP23 / CT3 × (f3 / f) < 0.

8.

3. The optical imaging device according to claim 1, characterized in that, the spacer element group further includes a second spacer element disposed on and in contact with the image side surface of the second lens and a third spacer element disposed on and in contact with the image side surface of the third lens; the axial distance Dr1r7 from the object side surface of the first lens to the object side surface of the fourth lens, the distance EP12 along the second optical axis between the first spacer element and the second spacer element, and the distance EP23 along the second optical axis between the second spacer element and the third spacer element satisfy: 1.7 < Dr1r7 / (EP12 + EP23) < 2.

3.

4. The optical imaging device according to claim 1, wherein the spacer element group further includes a fourth spacer element disposed on and in contact with the image side surface of the fourth lens; The effective focal length f5 of the fifth lens, the radius of curvature R9 of the object side surface of the fifth lens, the outer diameter D4m of the image side surface of the fourth spacer element, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 3.1 < f5 / R9 × |D4m / R7| < 5.

5.

5. The optical imaging device according to claim 1, characterized in that, The spacer element group further includes a third spacer element disposed on and in contact with the image side surface of the third lens and a fourth spacer element disposed on and in contact with the image side surface of the fourth lens; The distance EP34 between the third spacer element and the fourth spacer element along the second optical axis, the inner diameter d4s of the object side surface of the fourth spacer element, and the inner diameter d3m of the image side surface of the third spacer element satisfy: -3.1 < EP34 / (d4s - d3m) < -0.

7.

6. The optical imaging device according to claim 1, wherein The spacer element group further includes a third spacer element disposed on and in contact with the image side surface of the third lens and a fourth spacer element disposed on and in contact with the image side surface of the fourth lens; The outer diameter D3s of the object side surface of the third spacer element, the radius of curvature R7 of the object side surface of the fourth lens, the outer diameter D4s of the object side surface of the fourth spacer element, and the radius of curvature R9 of the object side surface of the fifth lens satisfy: 2.6 < |D3s / R7| + |D4s / R9| < 3.

15.

7. The optical imaging device according to claim 1, characterized in that, The spacer element group further includes a third spacer element disposed on and in contact with the image side surface of the third lens and a fourth spacer element disposed on and in contact with the image side surface of the fourth lens; The inner diameter d3m of the image side surface of the third spacer element, the perpendicular distance Yc42 from the critical point closest to the imaging surface of the optical imaging device on the image side surface of the fourth lens to the second optical axis, and the inner diameter d4s of the object side surface of the fourth spacer element satisfy: 1.25 < (d3m - Yc42) / (d4s - Yc42) < 1.

5.

8. The optical imaging device according to any one of claims 1 to 7, characterized in that, The spacer element group further includes a sixth spacer element disposed on and in contact with the image side surface of the sixth lens and a seventh spacer element disposed on and in contact with the image side surface of the seventh lens; The axial distance SAG71 between the intersection of the object side surface of the seventh lens and the second optical axis and the vertex of the effective radius of the object side surface of the seventh lens, the distance EP67 between the sixth spacer element and the seventh spacer element along the second optical axis, and the central thickness CT7 of the seventh lens on the second optical axis satisfy: -1.1 < SAG71 / (EP67 / CT7) < -0.

7.

9. The optical imaging device according to any one of claims 1 to 7, characterized in that, The spacer element group further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens and a sixth spacer element disposed on and in contact with the image side surface of the sixth lens; The effective focal length f6 of the sixth lens, the inner diameter d6s of the object side surface of the sixth spacer element, and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: -35 < f6 / (d6s - d5m) < -10.

9.

10. The optical imaging device according to any one of claims 1 to 7, characterized in that, The spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed on the image side surface of the sixth lens and in contact with the image side surface of the sixth lens; The outer diameter D6s of the object side surface of the sixth spacer element, the inner diameter d5m of the image side surface of the fifth spacer element, the distance EP56 between the fifth spacer element and the sixth spacer element along the second optical axis, and the spacing distance T56 between the fifth lens and the sixth lens on the second optical axis satisfy 4.8 < (D6s - d5m) / (EP56 - T56) < 9.

7.

11. The optical imaging device according to any one of claims 1 to 7, characterized in that, The spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed on the image side surface of the sixth lens and in contact with the image side surface of the sixth lens; The inner diameter d5s of the object side surface of the fifth spacer element, the inner diameter d6s of the object side surface of the sixth spacer element, the radius of curvature R10 of the image side surface of the fifth lens, and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -0.9 < d5s / d6s × (R10 / R11) < 0.

4.

12. The optical imaging device according to any one of claims 1 to 7, characterized in that, The spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; The effective focal length f5 of the fifth lens and the inner diameter d5m of the image side surface of the fifth spacer element satisfy: -4.8 < f5 / d5m < -3.

0.

13. The optical imaging device according to any one of claims 1 to 7, characterized in that, The spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; The inner diameter d5s of the object side surface of the fifth spacer element, the perpendicular distance Yc52 from the critical point closest to the imaging surface of the optical imaging device on the image side surface of the fifth lens to the second optical axis, and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 0.45 < (d5s - Yc52) / |f56| < 0.

65.

14. The optical imaging device according to any one of claims 1 to 7, characterized in that, The optical imaging device further includes: A fixing component, including an inclined portion, the inclined portion extending away from the first lens from the object side end surface of the lens barrel and in contact with the reflecting surface of the prism, and the angle between the inclined portion and the object side end surface of the lens barrel is less than 90°.

15. The optical imaging device according to any one of claims 1 to 7, wherein The object side surface of the first lens is a convex surface; The image side surface of the second lens is a concave surface; The object side surface of the third lens is a convex surface, and the image side surface is a concave surface; The object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; The object side surface of the fifth lens is a concave surface, and the image side surface is a convex surface; The image side surface of the sixth lens is a concave surface; The object side surface of the seventh lens is a convex surface.

Images