Optical imaging device

Abstract

The utility model provides an optical imaging device, which comprises a lens group, a spacing element group and a lens barrel, the lens group from the object side to the image side of the optical imaging device comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a sixth lens which are sequentially arranged at intervals, and the half Semi-FOV of the maximum half field angle of the optical imaging device and the numerical aperture fno of the optical imaging device meet the following conditions: 1lt; fno / tan (Semi-FOV) < = 1.25; the effective focal length f of the optical imaging device and the effective focal length f1 of the first lens meet the following formula:-2.3 lt; f1 / flt; -1.2,-1.2; the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacing element and the effective focal length f1 of the first lens meet the following condition:-1.45 < = (d0s-d1s) / f1lt; and-0.85. The problem that in the prior art, an ultra-wide-angle and large-aperture optical imaging device is serious in stray light is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical imaging equipment technical field, specifically, relate to an optical imaging device. BACKGROUND

[0002] With the progress of science and technology and the improvement of life quality, the user's requirement to the camera and other photographing equipment is also higher and higher. In the optical imaging device carried by the photographing equipment, the first lens of the optical imaging device with ultra-wide angle and large aperture needs to play the role of increasing the wide angle and improving the luminous flux. However, the negative tortuosity of the first lens is relatively large, which greatly refracts the light, so that the obvious internal reflection stray light is easily generated in the edge part of the first lens. Therefore, how to control the inner diameter size of the front end lens barrel, the spacing element and the optical parameter of the front end lens of the optical imaging device is very important problem to reduce the stray light while ensuring the ultra-wide angle and large aperture. SUMMARY

[0003] The main purpose of the utility model is to provide an optical imaging device to solve the problem of serious stray light of the optical imaging device with ultra-wide angle and large aperture in the prior art.

[0004] In order to achieve the above object, according to one aspect of the present application, an optical imaging device is provided, the number of lenses with optical power of the optical imaging device is six, the optical imaging device comprises: a lens group, the lens group comprises first to sixth lenses arranged in sequence and spaced from each other from the object side to the image side of the optical imaging device, the first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has optical power, and the sixth lens has optical power; a spacer element group, the spacer element group at least comprises a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; a lens barrel, the lens group and the spacer element group are accommodated in the lens barrel; wherein the half of the maximum half field angle Semi-FOV of the optical imaging device, the numerical aperture fno of the optical imaging device satisfy: 1

[0005] According to another aspect of the utility model, provide a kind of optical imaging device, the number of lens with optical power of optical imaging device is six pieces, and optical imaging device includes: lens group, from the object side of optical imaging device to the image side lens group includes sequentially spaced first lens to sixth lens, first lens has negative optical power, second lens has positive optical power, third lens has positive optical power, fourth lens has positive optical power, fifth lens has optical power, and sixth lens has optical power;Spacing element group, at least including the first spacing element between first lens and second lens and at least partially contacting the image side of first lens, the second spacing element between second lens and third lens and at least partially contacting the image side of second lens, the third spacing element between third lens and fourth lens and at least partially contacting the image side of third lens, the fourth spacing element between fourth lens and fifth lens and at least partially contacting the image side of fourth lens, and the fifth spacing element between fifth lens and sixth lens and at least partially contacting the image side of fifth lens;Lens barrel, and lens group and spacing element group are housed in lens barrel;Wherein, between the half Semi-FOV of the maximum half field angle of optical imaging device, the numerical aperture fno of optical imaging device satisfy: 1 < fno / tan (Semi-FOV) ≤1.25;Between the inner diameter d2m of the image side of second spacing element, the outer diameter D2m of the image side of second spacing element, the effective focal length f3 of third lens satisfy: 0.5≤(D2m-d2m) / f3 <1.3.

[0006] Further, the inner diameter d0s of the object side end surface of lens barrel, the inner diameter d0m of the image side end surface of lens barrel, the curvature radius R1 of the object side surface of first lens satisfy: 0.55<(d0s-d0m) / R1 <1.

[0007] Further, the inner diameter of second spacing element is minimum in the inner diameter of all spacing elements of spacing element group, the inner diameter d2s of the object side surface of second spacing element, the inner diameter d2m of the image side surface of second spacing element, the inner diameter d1m of the image side surface of first spacing element, the inner diameter d3s of the object side surface of third spacing element satisfy: 0.5<(d2s-d1m) / (d2m-d3s)<2.

[0008] Further, the inner diameter d2m of the image side surface of second spacing element, the outer diameter D2m of the image side surface of second spacing element, the effective focal length f3 of third lens satisfy: 0.5≤(D2m-d2m) / f3 <1.3.

[0009] Further, a distance EP01 of the object side end surface of the lens barrel to the object side surface of the first spacer element in the direction of the optical axis of the optical imaging device, a central thickness CT1 of the first lens on the optical axis satisfy: 1.4 < EP01 / CT1 < 2.45; a distance EP12 of the image side surface of the first spacer element to the object side surface of the second spacer element in the direction of the optical axis, a central thickness CT2 of the second lens on the optical axis satisfy: 0.8 < EP12 / CT2 < 1.75.

[0010] Further, an inner diameter d3s of the object side surface of the third spacer element, a combined focal length f123 of the first lens, the second lens and the third lens satisfy: -0.4 < d3s / f123 ≤ 0.25; an inner diameter d3m of the image side surface of the third spacer element, a combined focal length f456 of the fourth lens, the fifth lens and the sixth lens satisfy: 0.65 < d3m / f456 < 1.45.

[0011] Further, a central thickness CP3 of the third spacer element in the direction of the optical axis of the optical imaging device, a radius of curvature R7 of the object side surface of the fourth lens satisfy: 0 < CP3 / R7 < 0.4.

[0012] Further, an outer diameter D3s of the object side surface of the third spacer element, an effective diameter DT32 of the image side surface of the third lens satisfy: 2.1 < D3s / DT32 < 4.45; an outer diameter D3m of the image side surface of the third spacer element, an effective diameter DT41 of the object side surface of the fourth lens satisfy: 1.85 < D3m / DT41 < 3.9.

[0013] Further, an inner diameter d4m of the image side surface of the fourth spacer element, an inner diameter d5s of the object side surface of the fifth spacer element, an effective focal length f5 of the fifth lens, an effective focal length f6 of the sixth lens satisfy: -0.15 ≤ (d4m-f5) / (d5s-f6) < 15.75.

[0014] Further, an inner diameter d0m of the image side surface of the lens barrel, an inner diameter d5m of the image side surface of the fifth spacer element, an effective focal length f6 of the sixth lens satisfy: -1.95 < (d0m-d5m) / f6 ≤ 0.5.

[0015] Further, an effective focal length f of the optical imaging device, a distance L of the object side end surface of the lens barrel to the image side end surface of the lens barrel in the direction of the optical axis of the optical imaging device satisfy: 0.25 < f / L < 0.4.

[0016] Further, the image side surface of the first lens is a concave surface, the object side surface of the fourth lens is a convex surface, the image side surface of the sixth lens is a concave surface.

[0017] The technical scheme of the utility model discloses optical imaging device has the number of the lens with optical power six pieces, optical imaging device includes lens group, interval element group and lens barrel, from the object side of optical imaging device to the image side lens group includes the first lens to the sixth lens of interval arrangement in proper order, the first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has optical power, the sixth lens has optical power, interval element group at least includes the first interval element between the first lens and the second lens and with the image side surface of the first lens at least partial contact, the second interval element between the second lens and the third lens and with the image side surface of the second lens at least partial contact, the third interval element between the third lens and the fourth lens and with the image side surface of the third lens at least partial contact, the fourth interval element between the fourth lens and the fifth lens and with the image side surface of the fourth lens at least partial contact, the fifth interval element between the fifth lens and the sixth lens and with the image side surface of the fifth lens at least partial contact, lens group and interval element group are contained in the lens barrel, wherein, the half Semi-FOV of the maximum half field angle of optical imaging device, the numerical aperture fno of optical imaging device satisfy: 1 < fno / tan (Semi-FOV) ≤ 1.25, the effective focal length f of optical imaging device, the effective focal length f1 of the first lens satisfy: -2.3 < f1 / f < -1.2, the inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first interval element, the effective focal length f1 of the first lens satisfy: -1.45 ≤ (d0s-d1s) / f1 < -0.85.

[0018] The optical imaging device of the application uses six lenses with optical power, and the first to sixth lenses are arranged in sequence. In the optical imaging device, by controlling fno / tan (Semi-FOV) within a reasonable range, the optical imaging device can meet the specification requirements of ultra-wide angle and large aperture. At this time, the first lens of the optical imaging device has negative optical power, and under the condition of -2.3 < f1 / f < -1.2, the negative first lens with large tortuosity will refract light rays greatly, thereby easily producing obvious internal reflection stray light in the edge part of the first lens. By controlling (d0s-d1s) / f1 within a reasonable range, not only can the entry of part of the light be limited by the inner diameter of the object side end surface of the lens barrel to reduce the possibility of stray light generation, but also the stray light generated in the edge part of the image side surface of the first lens can be blocked by the first interval element, thereby helping to improve the problem of internal reflection stray light of the first lens and improving the imaging quality of the optical imaging device.

[0019] It should be noted that when (d0s-d1s) / f1 is too small, the inner diameter of the object side end surface of the lens barrel is too large, and the light entering the first lens is easy to bring serious stray light. When (d0s-d1s) / f1 is too large, the inner diameter of the object side surface of the first spacer element is too large, the shielding ability of the first spacer element is insufficient, and the edge stray light cannot be completely eliminated. The ultra-wide-angle and large-aperture optical imaging device of the application can not only ensure that the light entering the first lens through the lens barrel is within a reasonable range to avoid the generation of stray light, but also effectively shield the internal reflection stray light generated by the refraction of the first lens, thereby effectively improving the imaging quality of the optical imaging device. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the application form a part of the application and serve to further provide a further understanding of the application, the illustrative embodiments of the application and the explanations thereof serve to explain the application without constituting an improper limitation of the application. In the drawings:

[0021] Figure 1 A partial parameter schematic diagram of the optical imaging device of any optional embodiment of the application is shown;

[0022] Figure 2 A structure schematic diagram of the optical imaging device of embodiment one of the application is shown;

[0023] Figure 3 A structure schematic diagram of the optical imaging device of embodiment two of the application is shown;

[0024] Figure 4 A structure schematic diagram of the optical imaging device of embodiment three of the application is shown;

[0025] Figures 5 to 7 Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging device of embodiment one are shown respectively;

[0026] Figure 8 A structure schematic diagram of the optical imaging device of embodiment four of the application is shown;

[0027] Figure 9 A structure schematic diagram of the optical imaging device of embodiment five of the application is shown;

[0028] Figure 10 A structure schematic diagram of the optical imaging device of embodiment six of the application is shown;

[0029] Figures 11 to 13 Axial chromatic aberration curves, astigmatism curves and distortion curves of the optical imaging device of embodiment four are shown respectively;

[0030] Figure 14A structural schematic view of the optical imaging device of the seventh embodiment of the present application is shown.

[0031] Figure 15 A structural schematic view of the optical imaging device of the eighth embodiment of the present application is shown.

[0032] Figure 16 A structural schematic view of the optical imaging device of the ninth embodiment of the present application is shown.

[0033] Figures 17 to 19 An on-axis chromatic aberration curve, an astigmatism curve and a distortion curve of the optical imaging device of the seventh embodiment are shown respectively.

[0034] Figure 20 A stray light distribution diagram of the optical imaging device of an optional embodiment of the present application under the condition of fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, (d0s-d1s) / f1=-1.1 is shown.

[0035] Figure 21 A stray light distribution diagram of the optical imaging device of the prior art under the condition of fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, (d0s-d1s) / f1=-0.3 is shown.

[0036] Figure 22 A stray light distribution diagram of the optical imaging device of the prior art under the condition of fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, (d0s-d1s) / f1=-2.0 is shown.

[0037] Among them, the above drawings include the following reference signs:

[0038] P0, lens barrel; E1, first lens; P1, first spacer element; E2, second lens; P2, second spacer element; E3, third lens; P3, third spacer element; E4, fourth lens; P4, fourth spacer element; E5, fifth lens; P5, fifth spacer element; E6, sixth lens; S1, object side surface of the first lens; S2, image side surface of the first lens; S3, object side surface of the second lens; S4, image side surface of the second lens; S5, object side surface of the third lens; S6, image side surface of the third lens; S7, object side surface of the fourth lens; S8, image side surface of the fourth lens; S9, object side surface of the fifth lens; S10, image side surface of the fifth lens; S11, object side surface of the sixth lens; S12, image side surface of the sixth lens. DETAILED DESCRIPTION

[0039] It should be noted that the embodiments and features in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0040] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0041] In the present application, unless otherwise specified, the orientation words such as "upper", "lower", "top", "bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves. Similarly, for the convenience of understanding and description, "inner" and "outer" refer to the inner and outer of the contour of each component itself, but the above orientation words are not used to limit the present application.

[0042] It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0043] In the drawings, the thickness, size and shape of the lens have been slightly exaggerated for the convenience of illustration. Specifically, the shape of the spherical surface or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or aspherical surface is not limited to the shape of the spherical surface or aspherical surface shown in the drawings. The drawings are merely examples and are not strictly drawn to scale.

[0044] In this context, 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 specified, 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 specified, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those skilled in the art, with the R value (R refers to the radius of curvature in the paraxial region, usually refers to the R value on the lens data in the optical software) positive or negative to judge the convexity or concavity. As for the object side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave. As for the display side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0045] In order to solve the problem of serious stray light of the optical imaging device with ultra-wide angle and large aperture in the prior art, the present application provides an optical imaging device.

[0046] First embodiment

[0047] As Figures 1 to 20As shown, the optical imaging device has six pieces of lenses with optical power, and the optical imaging device includes a lens group, a spacer element group, and a lens barrel. From the object side to the image side of the optical imaging device, the lens group includes first to sixth lenses arranged in sequence, the first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has optical power, and the sixth lens has optical power. The spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side of the third lens, a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side of the fifth lens. The lens group and the spacer element group are accommodated in the lens barrel. The half of the maximum half field angle Semi-FOV of the optical imaging device and the numerical aperture fno of the optical imaging device satisfy: 1 < fno / tan(Semi-FOV) ≤ 1.25. The effective focal length f of the optical imaging device and the effective focal length f1 of the first lens satisfy: -2.3 < f1 / f < -1.2. The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, and the effective focal length f1 of the first lens satisfy: -1.45 ≤ (d0s-d1s) / f1 < -0.85.

[0048] The optical imaging device of the present application uses six pieces of lenses with optical power, and the first to sixth lenses are arranged in sequence. In the optical imaging device, by controlling fno / tan(Semi-FOV) within a reasonable range, the optical imaging device can meet the specification requirements of ultra-wide angle and large aperture. At this time, the first lens of the optical imaging device has negative optical power, and under the condition of -2.3 < f1 / f < -1.2, the negative first lens with large tortuosity will refract light rays greatly, thereby easily producing obvious internal reflection stray light in the edge part of the first lens. By controlling (d0s-d1s) / f1 within a reasonable range, not only can the entry of part of the light be limited by the inner diameter of the object side end surface of the lens barrel to reduce the possibility of stray light generation, but also the stray light generated in the edge part of the image side of the first lens can be blocked by the first spacer element, thereby helping to improve the problem of internal reflection stray light of the first lens and improving the imaging quality of the optical imaging device.

[0049] It should be noted that when (d0s-d1s) / f1 is too small, the inner diameter of the object side end surface of the lens barrel is too large, and the light entering the first lens is likely to cause serious stray light. When (d0s-d1s) / f1 is too large, the inner diameter of the object side surface of the first spacer element is too large, the blocking ability of the first spacer element is insufficient, and the edge stray light cannot be completely eliminated. The ultra-wide-angle, large-aperture optical imaging device of the present application can not only ensure that the light entering the first lens through the lens barrel is within a reasonable range to avoid the generation of stray light, but also effectively block the internal reflection stray light generated by the refraction of the first lens, thereby effectively improving the imaging quality of the optical imaging device.

[0050] The following Table 1 shows the stray light distribution diagram of an optional embodiment of the present application and the optical imaging device in the prior art under the condition of fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, and different values of (d0s-d1s) / f1. The imaging quality of the optical imaging device can be intuitively evaluated by the stray light distribution diagram, and the stray light condition of the imaging surface directly reflects the pros and cons of the imaging quality.

[0051] Table 1

[0052] Scheme No. Scheme 1 Scheme 2 Scheme 3 fno / tan (Semi-FOV) 1.03 1.03 1.03 f1 / f -1.21 -1.21 -1.21 (d0s-d1s) / f1 -1.1 -2.0 -0.3 Stray light distribution map APPENDIX Figure 20 APPENDIX Figure 21 APPENDIX Figure 22

[0053] The optical imaging device as shown in Scheme 2 and Scheme 3 belongs to the prior art. Scheme 2 satisfies fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, (d0s-d1s) / f1=-2.0, and the step difference between the inner diameter of the object side end surface of the lens barrel and the inner diameter of the object side surface of the first spacer element is too large. A large amount of light enters the optical imaging device, causing serious stray light as shown in Figure 21 . Scheme 3 satisfies fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, (d0s-d1s) / f1=-0.3, and the step difference between the inner diameter of the object side end surface of the lens barrel and the inner diameter of the object side surface of the first spacer element is too small. The light trend is steep, as shown in Figure 22 , and the stray light is still serious.

[0054] The optical imaging device as shown in Scheme 1 belongs to the embodiment of the present application. Scheme 1 satisfies fno / tan(Semi-FOV)=1.03, f1 / f=-1.21, (d0s-d1s) / f1=-1.1, and the step difference between the inner diameter of the object side end surface of the lens barrel and the inner diameter of the object side surface of the first spacer element is reasonable. The stray light of the optical imaging device is effectively blocked, as shown in Figure 20 , and the number and intensity of the stray light on the imaging surface are significantly reduced.

[0055] In the embodiment, the inner diameter d0sof the object-side end surface of the lens barrel, the inner diameter d0mof the image-side end surface of the lens barrel, and the radius of curvature R1of the object-side surface of the first lens satisfy: 0.55<(d0s-d0m) / R1<1. If the value of (d0s-d0m) / R1is too large, the difference between the inner diameters of the object-side end surface and the image-side end surface of the lens barrel is too large relative to the radius of curvature of the first lens, affecting the entry of light rays into the optical lens, and also increasing the reflection of the inner wall of the lens barrel to the stray light of the imaging surface, affecting the imaging quality. If the value of (d0s-d0m) / R1is too small, the difference between the inner diameters of the object-side end surface and the image-side end surface of the lens barrel is too small relative to the radius of curvature of the first lens, which is not conducive to considering both ultra-wide angle and large image surface. By limiting (d0s-d0m) / R1within a reasonable range, the light rays entering the first lens can be effectively converged by the convex design of the object-side surface of the first lens, ensuring sufficient light flux while avoiding excessive light rays from entering, reducing stray light in the inner wall of the lens barrel, and thus improving the imaging quality of the optical imaging device. In addition, the inner diameter of the image-side surface of the lens barrel needs to meet certain specifications to adapt to the corresponding chip area, and reasonable restriction of (d0s-d0m) / R1enables the optical imaging device to meet the requirements of ultra-wide angle, large aperture, field of view angle, and image height.

[0056] In the embodiment, the inner diameter of the second spacer element is the smallest among the inner diameters of all the spacer elements in the spacer element group, and the inner diameter d2sof the object-side surface of the second spacer element, the inner diameter d2mof the image-side surface of the second spacer element, the inner diameter d1mof the image-side surface of the first spacer element, and the inner diameter d3sof the object-side surface of the third spacer element satisfy: 0.5<(d2s-d1m) / (d2m-d3s)<2. If the value of (d2s-d1m) / (d2m-d3s) is too large, the second spacer element and the third spacer element excessively limit the amount of light passing through, reducing the brightness and resolving power of the optical imaging device. If the value of (d2s-d1m) / (d2m-d3s) is too small, the interception effect on the edge non-imaging light rays is poor, increasing the risk of stray light. By controlling (d2s-d1m) / (d2m-d3s) within a reasonable range, the inner diameters of the spacer elements before and after the second spacer element can be controlled, ensuring that the second spacer element balances the angles of the light rays entering and exiting, which can both block and absorb excessive light rays and effectively control stray light, and also will not excessively limit the light rays, thereby ensuring good imaging quality.

[0057] In the embodiment, the inner diameter d2m of the image-side surface of the second spacer element, the outer diameter D2m of the image-side surface of the second spacer element, and the effective focal length f3 of the third lens satisfy: 0.5≤(D2m-d2m) / f3<1.3. If the value of (D2m-d2m) / f3 is too large, the maximum thickness of the second spacer element in the direction of the optical axis is too large relative to the effective focal length of the third lens, affecting the molding and stability of the third lens, resulting in a decline in the quality of the third lens. If the value of (D2m-d2m) / f3 is too small, the second spacer element is insufficient to protect the third lens, and the edge portion of the third lens is prone to impact or thermal expansion, affecting the reliability and overall performance of the third lens. By keeping (D2m-d2m) / f3 within a reasonable range, the molding of the third lens with a thin middle and thick edges can be reasonably controlled, while ensuring effective protection of the third lens by the second spacer element and improving the overall performance and reliability of the optical imaging device.

[0058] In the embodiment, the distance EP01 from the object-side end surface of the lens barrel to the object-side surface of the first spacer element in the direction of the optical axis of the optical imaging device, and the center thickness CT1 of the first lens in the optical axis satisfy: 1.4<EP01 / CT1<2.45; the distance EP12 from the image-side surface of the first spacer element to the object-side surface of the second spacer element in the direction of the optical axis, and the center thickness CT2 of the second lens in the optical axis satisfy: 0.8<EP12 / CT2<1.75. By controlling EP01 / CT1 within a reasonable range, the first lens can be stably maintained in an effective position between the lens barrel and the first spacer element, while reducing stray light in the air gap, improving imaging quality, and ensuring that the first lens maintains good performance under various conditions. By controlling EP12 / CT2 within a reasonable range, the second lens can be accurately positioned in the optical imaging device, reducing displacement caused by vibration or thermal deformation, while maintaining good heat dissipation capability, improving the reliability and imaging quality of the optical imaging device.

[0059] In the embodiment, the inner diameter d3s of the object side surface of the third spacer element, the combined focal length f123 of the first lens, the second lens and the third lens satisfy: -0.4 < d3s / f123 < 0.25; the inner diameter d3m of the image side surface of the third spacer element, the combined focal length f456 of the fourth lens, the fifth lens and the sixth lens satisfy: 0.65 < d3m / f456 < 1.45. By controlling d3s / f123 within a reasonable range, the inner diameter of the object side surface of the third spacer element is constrained, the volume and weight of the third spacer element can be controlled, the mold processing difficulty and the molding difficulty are reduced, and the imaging quality is ensured. At the same time, by controlling the inner diameter of the object side surface of the third spacer element and the combined focal length of the front-end lens, it can be ensured that enough light enters the front-end lens, while reducing internal stray light, improving the clarity and luminous flux of the image, and maintaining good imaging effect under various lighting conditions. By controlling d3m / f456 within a reasonable range, the inner diameter of the image side surface of the third spacer element is constrained, the volume and weight of the third spacer element can be controlled, the mold processing difficulty and the molding difficulty are reduced, and the imaging quality is ensured. It can ensure the effective diameter of the light passing through the rear-end lens, reduce scattering and distortion, and at the same time ensure sufficient luminous flux, improve the edge quality and overall imaging quality.

[0060] In the embodiment, the center thickness CP3 of the third spacer element along the direction of the optical axis of the optical imaging device, the curvature radius R7 of the object side surface of the fourth lens satisfy: 0 < CP3 / R7 < 0.4. The curvature radius of the object side surface of the fourth lens determines the trend of the effective diameter edge of the fourth lens, that is, it affects the distance between the effective diameter edge and the third lens. If the value of CP3 / R7 is too large, a relatively thick spacer element needs to be used between the third lens and the fourth lens, that is, the third spacer element is too thick, which limits the space near the object side surface of the fourth lens and affects the overall design of the lens group and the optimization of the light path. If the value of CP3 / R7 is too small, a very thin spacer element needs to be used between the third lens and the fourth lens, that is, the third spacer element is too thin, which leads to insufficient structural strength of the third spacer element and easy deformation during assembly or use, affecting the stability of the optical imaging device and the imaging quality. By limiting CP3 / R7 within a reasonable range, the thickness of the third spacer element can be designed within a reasonable range, which neither affects the optimization of the light path nor ensures sufficient structural strength, and improves the assembly stability of the third lens, the fourth lens and the imaging quality of the optical imaging device.

[0061] In the embodiment, the outer diameter D3s of the object side surface of the third spacer element, the effective diameter DT32 of the image side surface of the third lens satisfy: 2.1 < D3s / DT32 < 4.45; the outer diameter D3m of the image side surface of the third spacer element, the effective diameter DT41 of the object side surface of the fourth lens satisfy: 1.85 < D3m / DT41 < 3.9. By controlling D3s / DT32 within a reasonable range, the surface accuracy of the third lens during molding can be improved, ensuring that the third lens and the third spacer element have good alignment during assembly, while ensuring sufficient light passing ability, improving the luminous flux and imaging effect of the optical imaging device, and enhancing reliability and stability. By controlling D3m / DT41 within a reasonable range, the surface accuracy of the fourth lens during molding can be improved, ensuring a proper gap between the third spacer element and the fourth lens, maintaining good structural strength and stability, while ensuring sufficient light passing ability, improving the luminous flux and imaging effect of the optical imaging device, and enhancing the reliability and stability of the optical imaging device.

[0062] In the embodiment, the inner diameter d4m of the image side surface of the fourth spacer element, the inner diameter d5s of the object side surface of the fifth spacer element, the effective focal length f5 of the fifth lens, the effective focal length f6 of the sixth lens satisfy: -0.15 ≤ (d4m-f5) / (d5s-f6) < 15.75. Due to the negative refractive power, the effective diameter of the fifth lens is in the shape of thin in the middle and thick on both sides, and the inner diameter of the image side surface of the fourth spacer element determines the length of the effective diameter of the fifth lens, and the inner diameter of the image side surface of the fifth spacer element controls the shape and focal length of the sixth lens as a whole. If the value of (d4m-f5) / (d5s-f6) is not properly set, i.e. the effective diameter of the fifth and sixth lenses is not reasonably designed, the light transmission between the fifth and sixth lenses will be refracted or scattered, affecting the clarity and color accuracy of the imaging. By limiting (d4m-f5) / (d5s-f6) within a reasonable range, the relationship between the thickest part of the sixth lens and the inner diameter of the fifth spacer element is reasonably controlled, so that the sixth lens has good molding conditions and is not easily deformed by extrusion. The yield and quality of the sixth lens production can be effectively improved. At the same time, by limiting the effective diameter of the fifth and sixth lenses within a reasonable range, the light path can be optimized, and the clarity and color accuracy of the imaging can be improved.

[0063] In the embodiment, the inner diameter d0m of the image side surface of the lens barrel, the inner diameter d5m of the image side surface of the fifth spacer element, and the effective focal length f6 of the sixth lens satisfy the following relationship: -1.95 < (d0m-d5m) / f6≤0.5. The sixth lens is located at the end of the optical imaging device, and the effective focal length of the sixth lens controls the divergence angle of the light rays and determines the image height position of the imaging surface. If the value of (d0m-d5m) / f6 is too large, i.e., the space between the lens barrel and the fifth spacer element is too large, unnecessary reflections of the light rays occur in the path before reaching the sixth lens, affecting the imaging quality. If the value of (d0m-d5m) / f6 is too small, the space between the lens barrel and the fifth spacer element is too small, limiting the effective diameter of the light rays and reducing the brightness and resolving power of the optical imaging device. By controlling (d0m-d5m) / f6 within a reasonable range, the inner diameter of the image side surface of the fifth spacer element and the inner diameter of the image side surface of the lens barrel can be controlled, ensuring the stability of the support while not blocking the light rays, so that the optical imaging device meets the image height specifications while having a good support structure, improving the reliability of the optical imaging device.

[0064] In the embodiment, the effective focal length f of the optical imaging device and the distance L of the object side end surface of the lens barrel to the image side end surface of the lens barrel along the direction of the optical axis of the optical imaging device satisfy the following relationship: 0.25 < f / L < 0.4. If the value of f / L is too large, the effective focal length of the optical imaging device is relatively large compared to the distance of the object side end surface of the lens barrel to the image side end surface of the lens barrel along the direction of the optical axis, resulting in an excessively long length of the optical imaging device, which is not suitable for integration into compact devices, while increasing unnecessary cost and weight. If the value of f / L is too small, it means that the effective focal length of the optical imaging device is too small, resulting in an excessively compact design of the optical path of the optical imaging device, increasing the risk of aberration and distortion, and affecting the imaging clarity. By controlling f / L within a reasonable range, the optical imaging device can meet the requirements of compact design while reducing aberration and distortion, ensuring good imaging performance and adaptability. In addition, the constraint of f / L enables the optical imaging device to meet the back focal size and adapt to the process requirements of the rear-end module packaging, and also meets the spatial size requirements of the optical imaging device at the whole machine end.

[0065] In the embodiment, the image side surface of the first lens is concave, the object side surface of the fourth lens is convex, and the image side surface of the sixth lens is concave. The image side surface of the first lens is concave, and the light rays are divergent after passing through the first lens. The first lens is located at the front end of the optical imaging device, and the negative focal power of the first lens can effectively reduce the light ray angle, especially in the ultra-wide-angle scene, which helps to control the smooth trend of the light rays in the subsequent lenses, thereby reducing the edge distortion and chromatic aberration and improving the picture orthogonality. The object side surface of the fourth lens is convex, and the fourth lens also has a positive focal power, so that the light rays are further converged after passing through the third lens, ensuring that the light rays can be more accurately aligned when passing through the middle of the optical imaging device, thereby improving the edge image quality. The image side surface of the sixth lens is concave, which can finely adjust the divergence angle of the light rays, ensure that the light rays uniformly form an image on the image plane, reduce the spherical aberration and coma, and at the same time avoid the premature focusing of the light rays causing image blur.

[0066] Optionally, the optical imaging device in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. Optionally, the optical imaging device can be simulated by CODEV software. In the process of simulation by software and / or tools such as the above, the surface shape of each lens can be appropriately adjusted according to the surface shape of the surface provided by the software and / or the tools used.

[0067] In the embodiment, each lens can be selected to be a cut-edge lens. The cut-edge lens has a cut-edge structure and a non-cut-edge structure on the outer diameter surface, and the outer diameter of the cut-edge structure is smaller than that of the non-cut-edge structure. The outer diameter of the cut-edge lens usually refers to the outer diameter of the non-cut-edge structure.

[0068] In the embodiment, each spacer element can be selected to be a cut-edge spacer element. The cut-edge spacer element has a cut-edge portion and a non-cut-edge portion on the outer ring surface, and the outer diameter of the cut-edge portion is smaller than that of the non-cut-edge portion. The outer diameter of the cut-edge spacer element usually refers to the maximum outer diameter of the non-cut-edge portion.

[0069] Second embodiment

[0070] As Figures 1 to 20As shown, the optical imaging device has six pieces of lenses with optical power, and the optical imaging device includes a lens group, a spacer element group, and a lens barrel. From the object side to the image side of the optical imaging device, the lens group includes first to sixth lenses arranged in sequence, the first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has optical power, and the sixth lens has optical power. The spacer element group includes at least a first spacer element located between the first lens and the second lens and at least partially in contact with the image side of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side of the third lens, a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side of the fifth lens. The lens group and the spacer element group are accommodated in the lens barrel. The half of the maximum half field of view Semi-FOV of the optical imaging device and the numerical aperture fno of the optical imaging device satisfy 1 < fno / tan(Semi-FOV) ≤ 1.25. The inner diameter d2m of the image side of the second spacer element, the outer diameter D2m of the image side of the second spacer element, and the effective focal length f3 of the third lens satisfy 0.5 ≤ (D2m-d2m) / f3 < 1.3.

[0071] The optical imaging device of the present application uses six pieces of lenses with optical power, and the first to sixth lenses are arranged in sequence. In the optical imaging device, by controlling fno / tan(Semi-FOV) within a reasonable range, the optical imaging device can meet the specification requirements of ultra-wide angle and large aperture, but under the conditions of ultra-wide angle and large aperture, the first lens needs to maintain a large amount of refractive power, and the light is refracted by the first lens, causing the light to be refracted sharply at the edge of the lens, causing internal reflection stray light and reducing edge sharpness. By controlling (D2m-d2m) / f3 within a reasonable range, the thickness of the second spacer element along the optical axis can neither excessively limit the free propagation of light nor be insufficient to effectively block stray light. In addition, by adjusting the focal length of the third lens, the light path can be optimized to ensure that the light can be appropriately converged at the third lens after the initial divergence after passing through the first lens, reducing the generation of stray light and significantly improving the imaging quality of the optical imaging device.

[0072] Optionally, the optical imaging device described above can further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0073] The optical imaging device in the present application can employ multiple lenses, for example, six lenses as described above. In the present application, at least one of the mirror surfaces of each lens is an aspheric mirror surface. The aspheric lens is characterized in that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens having a constant curvature from the center of the lens to the periphery of the lens, the aspheric lens has a better curvature radius characteristic, and has the advantages of improving the distortion aberration and improving the astigmatism aberration. After the aspheric lens is employed, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0074] However, those skilled in the art should understand that the number of lenses constituting the optical imaging device can be changed without departing from the technical solutions claimed by the present application, to obtain the various results and advantages described in the present application. For example, although six lenses are described as an example in the embodiments, the optical imaging device is not limited to including six lenses. If necessary, the optical imaging device can also include other numbers of lenses.

[0075] Figure 1 The size annotation diagram of an optical imaging device of the present application is shown, Figure 1 The parameters d1s, D2m, L, EP12, etc. are marked in the figure, so that the meanings of the parameters are clear and intuitive. In order to facilitate the description of the optical imaging device and the surface type of the specific lens, the parameters are no longer embodied in the figure when the specific embodiments are described below.

[0076] The specific surface type and parameters of the optical imaging device applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0077] It should be noted that any one of the following embodiments 1 to 9 is applicable to all embodiments of the present application.

[0078] Embodiment 1

[0079] As shown in Figure 2 , the optical imaging device of the embodiment 1 of the present application is described. Figure 2 The structural schematic diagram of the optical imaging device of the embodiment 1 is shown.

[0080] As shown in Figure 2 , the optical imaging device sequentially includes, from the object side to the image side: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, and a sixth lens E6.

[0081] In the present embodiment, the first lens E1 has a negative focal power, the object side S1 of the first lens is a concave surface, and the image side S2 of the first lens is a concave surface. The second lens E2 has a positive focal power, the object side S3 of the second lens is a convex surface, and the image side S4 of the second lens is a concave surface. The third lens E3 has a positive focal power, the object side S5 of the third lens is a concave surface, and the image side S6 of the third lens is a convex surface. The fourth lens E4 has a positive focal power, the object side S7 of the fourth lens is a convex surface, and the image side S8 of the fourth lens is a concave surface. The fifth lens E5 has a positive focal power, the object side S9 of the fifth lens is a convex surface, and the image side S10 of the fifth lens is a convex surface. The sixth lens E6 has a positive focal power, the object side S11 of the sixth lens is a convex surface, and the image side S12 of the sixth lens is a concave surface. The optical imaging device further has a filter, the filter has an object side S13 of the filter and an image side S14 of the filter. The light rays from the object pass through S1 to S14 to reach the imaging plane S15.

[0082] Table 2 shows the basic structural parameters of the optical imaging device of embodiment one, wherein the units of the radius of curvature, the thickness / distance, the effective radius and the focal length are all millimeters (mm).

[0083] Table 2

[0084] Surface No. Surface Type Curvature Radius Thickness Refractive Index Abbe Number Effective Radius Conic Coefficient OBJ Sphere Infinite 400.0000 S1 Asphere -2.2742 0.2814 1.54 56.11 1.3680 -0.6798 S2 Asphere 1.2488 0.2324 0.8294 -0.0629 S3 Asphere 0.8588 0.4805 1.64 23.53 0.7818 -0.5184 S4 Asphere 0.9603 0.2967 0.5089 0.0527 STO Sphere Infinite 0.0512 0.4614 0.0000 S5 Asphere -111.8940 0.4738 1.54 56.11 0.5124 -99.0000 S6 Asphere -1.2229 0.0351 0.6442 1.0330 S7 Asphere 1.9009 0.8673 1.54 56.11 0.8897 -0.2071 S8 Asphere 82.8886 0.0300 0.9505 -99.0000 S9 Asphere 59.1402 0.2400 1.67 19.24 0.9145 -39.9398 S10 Asphere -80.2290 0.0739 0.9706 5.0000 S11 Asphere 1.0207 0.4973 1.54 55.65 0.9871 -0.8908 S12 Asphere 1.3543 0.1628 1.2176 -0.1854 S13 Asphere Sphere 0.2100 1.52 64.20 1.3181 0.0000 S14 Infinite Sphere 0.5500 1.3717 0.0000 S15 Infinite Sphere 0.0000 1.5952 0.0000

[0085] In embodiment one, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are all aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0086]

[0087] wherein x is the distance sag of the aspherical surface at a height of h along the direction of the optical axis from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the inverse of the radius of curvature R in Table 2 above); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 3 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 and A24 that can be used for each aspherical surface S1-S12 in embodiment one. Wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above embodiment one. In the present embodiment, the object side and the image side of the first lens to the sixth lens are all aspherical surfaces.

[0088] Table 3

[0089]

[0090] InfiniteThe on-axis chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 5 The astigmatism curves of the optical imaging device of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 6 The distortion curves of the optical imaging device of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles.

[0091] according to Figure 7 As can be seen, the optical imaging device given in Example 1 can achieve good imaging quality.

[0092] Example 2

[0093] like Figures 5 to 7 As shown, an optical imaging device according to Embodiment 2 of this application is described. The difference between Embodiment 1 and Embodiment 2 is that the distance and thickness between the various spacer elements, lenses, lens barrels P0, etc. are different.

[0094] Figure 3 A schematic diagram of the optical imaging device according to Embodiment 2 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted. In this embodiment, the outer diameters of the image-side surface of the second spacer element and the third spacer element are appropriately reduced, which, while ensuring stable support, facilitates the miniaturization of the optical imaging device.

[0095] Example 3

[0096] like Figure 3 As shown, an optical imaging device according to Embodiment 3 of this application is described. The difference between Embodiment 1 and Embodiment 3 is that the distance and thickness between the various spacer elements, lenses, lens barrels P0, etc. are different.

[0097] Figure 4 A schematic diagram of the optical imaging device of Embodiment 3 is shown. For the sake of brevity, descriptions similar to those in Embodiment 1 are omitted. In this embodiment, the maximum thickness of the third spacer element along the optical axis is increased, which is beneficial for controlling the edge thickness ratio of the third lens and the fourth lens, and improving manufacturability and assembly stability.

[0098] Example 4

[0099] like Figure 4 As shown, an optical imaging device according to Embodiment 4 of this application is described. Figure 8 A schematic diagram of the optical imaging device of Embodiment 4 is shown.

[0100] like Figure 8As shown, the optical imaging device comprises, in order from the object side to the image side: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, and a sixth lens E6.

[0101] In this embodiment, the first lens E1 has a negative focal power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is concave. The second lens E2 has a positive focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has a positive focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has a positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has a positive focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has a negative focal power, the object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is concave. The optical imaging device also has a filter, which has an object side surface S13 and an image side surface S14 of the filter. The light rays from the object pass through S1 to S14 to reach the image plane S15.

[0102] Table 4 shows the basic structural parameters of the optical imaging device of Example Four, wherein the units of the radius of curvature, the thickness / distance, the effective radius, and the focal length are all millimeters (mm).

[0103] Table 4

[0104]

[0105]

[0106] Table 5 shows the high-order term coefficients of the aspherical surfaces that can be used in the lenses of the embodiments, wherein the aspherical surface of each lens can be defined by the formula (1) given in Example One. In this embodiment, the object side surface and the image side surface of each of the first lens to the sixth lens are aspherical surfaces.

[0107] Table 5

[0108] Figure 8 A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 8.6405E-01 -1.5740E+00 2.3669E+00 -2.5759E+00 1.9465E+00 -9.8385E-01 3.1619E-01 -5.8297E-02 4.6953E-03 S2 1.0485E+00 9.2471E+00 -1.5245E+02 1.2191E+03 -5.9215E+03 1.7935E+04 -3.3039E+04 3.3851E+04 -1.4772E+04 S3 1.8326E-01 -1.8147E+00 7.6006E+00 -2.5907E+01 4.8207E+01 -3.1003E+01 -9.1966E+00 0.0000E+00 0.0000E+00 S4 5.8050E-01 -4.4089E+00 9.7381E+01 -1.0623E+03 6.8053E+03 -2.2456E+04 3.0311E+04 0.0000E+00 0.0000E+00 S5 1.0247E-01 6.9430E-01 -1.2365E+01 1.0595E+02 -4.9080E+02 1.4016E+03 -1.6029E+03 0.0000E+00 0.0000E+00 S6 -1.3735E+00 2.7459E+00 1.6036E+01 -2.0128E+02 8.7705E+02 -1.8151E+03 1.5553E+03 0.0000E+00 0.0000E+00 S7 -1.1672E+00 3.6919E+00 -6.9849E+00 -1.0276E+01 6.1909E+01 -6.0947E+01 -4.3693E+00 0.0000E+00 0.0000E+00 S8 2.5583E-01 -5.5716E+00 4.4291E+01 -2.0910E+02 6.0683E+02 -1.0903E+03 1.1280E+03 -5.0968E+02 0.0000E+00 S9 2.2761E-01 -3.6934E+00 2.8716E+01 -1.2330E+02 3.1119E+02 -4.7664E+02 4.1077E+02 -1.5077E+02 0.0000E+00 S10 7.1498E-01 -6.7974E+00 3.4833E+01 -1.0658E+02 2.1196E+02 -3.0800E+02 3.4897E+02 -2.7020E+02 9.8937E+01 S11 7.4744E-02 -5.8675E+00 2.0897E+01 -3.0445E+01 -2.0878E+01 1.5006E+02 -2.1412E+02 1.1746E+02 -1.5552E+01 S12 -1.3654E-02 -2.1320E+00 8.6996E+00 -2.2282E+01 4.1676E+01 -5.5004E+01 4.7629E+01 -2.4078E+01 5.3562E+00

[0109] Surface No. Figure 8 shows the axial chromatic aberration curve of the optical imaging device of Example Four, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the optical imaging device. Figure 11 Figure 9 shows the astigmatism curve of the optical imaging device of Example Four, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 12The distortion curves of the optical imaging device of Embodiment 4 are shown, which represent the distortion magnitude values ​​corresponding to different field of view angles.

[0110] according to Figure 13 It can be seen that the optical imaging device given in Example 4 can achieve good imaging quality.

[0111] Example 5

[0112] like Figures 11 to 13 As shown, an optical imaging device according to Embodiment 5 of this application is described. The difference between Embodiment 4 and Embodiment 5 is that the distance and thickness between the various spacer elements, lenses, lens barrels P0, etc. are different.

[0113] Figure 9 A schematic diagram of the optical imaging device of Embodiment 5 is shown. For the sake of brevity, descriptions similar to those in Embodiment 4 are omitted. In this embodiment, the wall thickness at the image-side end of the lens tube is moderately reduced to avoid interference with the light rays emitted from the sixth lens.

[0114] Example 6

[0115] like Figure 9 As shown, an optical imaging device according to Embodiment Six of this application is described. The difference between Embodiment Four and Embodiment Six is ​​that the distance and thickness between the various spacer elements, lenses, lens barrels P0, etc. are different.

[0116] Figure 10 A schematic diagram of the optical imaging device according to Embodiment Six is ​​shown. For the sake of brevity, descriptions similar to those in Embodiment Four are omitted. In this embodiment, the wall thickness in the middle of the lens barrel is moderately reduced, which is beneficial for miniaturization of the optical imaging device.

[0117] Example 7

[0118] like Figure 10 The optical imaging apparatus of Embodiment 7 of this application is described in the figure. Figure 14 A schematic diagram of the optical imaging device of Embodiment 7 is shown.

[0119] like Figure 14 As shown, the optical imaging device includes, from the object side to the image side, the following components in sequence: a first lens E1, a first spacer element P1, a second lens E2, a second spacer element P2, a third lens E3, a third spacer element P3, a fourth lens E4, a fourth spacer element P4, a fifth lens E5, a fifth spacer element P5, and a sixth lens E6. It should be noted that in this embodiment, the inner diameter of the object-side end of the lens barrel P0 is larger than the inner diameter of the image-side end. That is, the lenses and spacers are assembled sequentially from the object side, and the image-side surface of the sixth lens rests against the image-side end of the lens barrel.

[0120] In this embodiment, the first lens E1 has negative refractive power, the object side S1 of the first lens is convex, and the image side S2 of the first lens is concave. The second lens E2 has positive refractive power, the object side S3 of the second lens is concave, and the image side S4 of the second lens is convex. The third lens E3 has positive refractive power, the object side S5 of the third lens is convex, and the image side S6 of the third lens is concave. The fourth lens E4 has positive refractive power, the object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is convex. The fifth lens E5 has negative refractive power, the object side S9 of the fifth lens is concave, and the image side S10 of the fifth lens is concave. The sixth lens E6 has negative refractive power, the object side S11 of the sixth lens is convex, and the image side S12 of the sixth lens is concave. The optical imaging device further has a filter, the filter has an object side S13 of the filter and an image side S14 of the filter. The light rays from the object pass through S1 to S14 to reach the imaging plane S15.

[0121] Table 6 shows the basic structure parameters of the optical imaging device of embodiment seven, wherein the units of the radius of curvature, the thickness / distance, the effective radius and the focal length are millimeter (mm).

[0122] Table 6

[0123]

[0124]

[0125] Table 7 shows the high order term coefficients of the aspherical surfaces of the lenses in the embodiment, wherein the surface type of each aspherical surface can be defined by the formula (1) given in embodiment one. In this embodiment, the object side and the image side of the first lens to the sixth lens are aspherical surfaces.

[0126] Table 7

[0127] Figure 14 A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 9.4733E-02 -7.6130E-02 -4.6893E-02 1.4310E-01 -1.5393E-01 9.1861E-02 -2.8742E-02 3.6970E-03 0.0000E+00 S2 2.4910E-01 6.9482E-01 -8.2046E+00 5.2150E+01 -2.0879E+02 5.2971E+02 -8.2083E+02 7.0722E+02 -2.5942E+02 S3 1.9573E-01 2.6743E-01 -1.0578E+00 3.0230E+00 -9.3471E+00 1.8531E+01 -2.0417E+01 9.5072E+00 0.0000E+00 S4 5.7300E-01 -1.3934E+00 1.3542E+01 -8.0211E+01 3.0602E+02 -7.0117E+02 8.7368E+02 -4.4538E+02 0.0000E+00 S5 2.2853E-01 -1.0556E+00 6.5394E+00 -2.8114E+01 7.3028E+01 -1.0411E+02 6.4685E+01 0.0000E+00 0.0000E+00 S6 -7.9646E-01 1.3768E+00 -2.9130E+00 5.7979E+00 -8.9167E+00 7.5464E+00 1.2834E-01 0.0000E+00 0.0000E+00 S7 -3.3810E-01 5.0707E-01 -8.5374E-01 -4.7692E-01 5.8307E+00 -1.1419E+01 7.1773E+00 0.0000E+00 0.0000E+00 S8 -4.8473E-01 -2.1629E-01 4.1818E+00 3.0165E+00 -6.9788E+01 2.1656E+02 -3.2046E+02 2.3581E+02 -6.7819E+01 S9 -3.9265E-01 -1.6420E+00 -8.7274E+00 9.9272E+01 -4.0684E+02 9.4776E+02 -1.3074E+03 9.9215E+02 -3.1843E+02 S10 1.1385E+00 -5.0644E+00 9.5948E+00 -3.3168E+00 -2.4844E+01 6.0686E+01 -6.7121E+01 3.7653E+01 -8.6368E+00 S11 -2.6022E-01 4.9244E-01 -2.8169E-01 -7.9563E-01 2.6096E+00 -3.2013E+00 1.8137E+00 -3.9542E-01 0.0000E+00 S12 -5.5099E-01 1.0865E+00 -1.6737E+00 2.0722E+00 -1.8764E+00 1.1164E+00 -3.8192E-01 5.5969E-02 0.0000E+00

[0128] Surface No. The axial chromatic aberration curve of the optical imaging device of embodiment seven is shown, which represents the deviation of the converging focal points of light rays of different wavelengths after passing through the optical imaging device. Figure 17 The astigmatism curve of the optical imaging device of embodiment seven is shown, which represents the meridional image surface curvature and the sagittal image surface curvature. Figure 18 The distortion curve of the optical imaging device of embodiment seven is shown, which represents the distortion size values corresponding to different field angles.

[0129] According to Figure 19 It can be seen that the optical imaging device given in embodiment seven can achieve good imaging quality.

[0130] Embodiment eight

[0131] like Figures 17 to 19 As shown, an optical imaging device according to Embodiment 8 of this application is described. The difference between Embodiment 7 and Embodiment 8 is that the distance and thickness between the various spacer elements, lenses, lens barrels, etc. are different.

[0132] Figure 15 A schematic diagram of the optical imaging device of Embodiment 8 is shown. For the sake of brevity, descriptions similar to those in Embodiment 7 are omitted. In this embodiment, the front port diameter of the optical imaging device is larger, the object-side opening of the lens tube is enlarged, and the wall thickness is moderately increased, which provides large-angle light imaging while ensuring the stability of the optical imaging device.

[0133] Example 9

[0134] like Figure 15 As shown, an optical imaging device according to Embodiment Nine of this application is described. The difference between Embodiment Seven and Embodiment Nine is that the distance and thickness between the various spacer elements, lenses, lens barrels P0, etc. are different.

[0135] Figure 16 A schematic diagram of the optical imaging device according to Embodiment Nine is shown. For simplicity, descriptions similar to those in Embodiment Seven are omitted. In this embodiment, the front port diameter of the optical imaging device is larger, the object-side opening of the lens tube is enlarged, and the wall thickness is moderately increased, providing stability for the optical imaging device while offering wide-angle light imaging. Furthermore, the inner diameters of both the first and second spacers are moderately reduced, which helps to shield the front end of the optical imaging device from stray light.

[0136] In summary, Embodiments 1 to 9 of the optical imaging device respectively satisfy the relationships shown in Table 8.

[0137] Table 8

[0138] Figure 16 1 2 3 4 5 6 7 8 9 Conditional Expression / Embodiment 1.03 1.03 1.03 1.25 1.25 1.25 1.07 1.07 1.07 fno / tan (Semi-FOV) -1.21 -1.21 -1.21 -1.46 -1.46 -1.46 -2.27 -2.27 -2.27 f1 / f -0.99 -1.04 -1.10 -1.45 -1.29 -1.42 -0.86 -0.88 -0.94 (d0s-d1s) / f1 0.64 0.57 0.57 0.94 0.99 0.90 0.65 0.60 0.66 (d0s-d0m) / R1 0.92 1.04 0.52 1.61 1.41 1.67 1.93 1.40 1.32 (d2s-d1m) / (d2m-d3s) 1.27 0.86 1.35 0.70 0.47 0.74 0.50 0.75 0.80 (D2m-d2m) / f3 2.22 2.28 2.42 1.60 1.44 1.73 1.57 1.79 1.91 EP01 / CT1 0.83 0.81 0.85 1.09 1.08 1.10 1.71 1.70 1.66 EP12 / CT2 0.18 0.18 0.25 -0.38 -0.39 -0.37 0.17 0.17 0.17 d3s / f123 1.42 1.35 0.95 0.85 0.87 0.83 0.71 0.69 0.79 d3m / f456 0.23 0.21 0.23 0.01 0.01 0.01 0.37 0.36 0.35 CP3 / R7 2.23 2.13 2.23 3.12 3.27 4.41 2.83 2.65 2.92 D3s / DT32 2.09 1.98 2.10 2.73 2.86 3.86 1.87 2.00 2.06 D3m / DT41 15.58 15.58 15.72 -0.14 -0.15 -0.15 5.57 5.61 5.62 (d4m-f5) / (d5s-f6) 0.50 0.49 0.50 -1.92 -1.80 -1.86 0.10 -0.30 -0.30 (d0m-d5m) / f6 0.35 0.34 0.35 0.27 0.28 0.28 0.39 0.37 0.36

[0139] Table 9 shows the effective focal lengths f1 to f6 of each lens in the optical imaging devices of Examples 1 to 9, in mm; the semi-FOV of the optical imaging devices is in °.

[0140] Table 9

[0141]

[0142]

[0143] Table 10 shows some structural parameters of the optical imaging devices in Examples 1 to 9, in mm.

[0144] Table 10

[0145] f / L 1 2 3 4 5 6 7 8 9 Parameter / Embodiment 1.650 1.669 1.662 1.433 1.420 1.483 1.515 1.541 1.480 d1s 1.626 1.641 1.638 1.433 1.420 1.483 1.515 1.541 1.480 d1m 0.924 0.950 0.900 0.830 0.800 0.742 1.340 1.155 1.202 d2s 0.924 0.950 0.900 0.830 0.800 0.742 1.340 1.155 1.202 d2m 3.804 2.884 3.948 4.644 3.346 4.811 3.081 3.792 4.002 D2m 1.688 1.617 2.325 1.204 1.240 1.185 1.431 1.431 1.412 d3s 2.921 2.778 1.961 1.204 1.240 1.185 1.710 1.661 1.895 d3m 2.879 2.743 2.879 3.474 3.644 4.911 3.548 3.315 3.655 D3s 3.726 3.532 3.745 3.474 3.644 4.911 2.899 3.098 3.186 D3m 1.863 1.879 1.891 1.543 1.529 1.518 1.646 1.652 1.667 d4m 1.969 1.969 1.998 1.661 1.708 1.713 2.096 2.060 2.052 d5s 1.969 1.969 1.998 1.661 1.708 1.713 2.906 2.060 2.052 d5m 3.074 3.165 3.247 3.681 3.406 3.681 4.323 4.393 4.541 d0s 4.530 4.471 4.533 5.385 5.197 5.313 2.656 2.846 2.833 d0m 0.624 0.641 0.680 0.893 0.802 0.967 0.607 0.693 0.742 EP01 0.400 0.390 0.406 0.569 0.565 0.575 0.641 0.635 0.623 L 3.411 3.487 3.411 3.862 3.843 3.757 3.697 3.855 3.966 EP12 CP3 0.428 0.402 0.428 0.026 0.030 0.020 0.518 0.501 0.488

[0146] Obviously, the above-described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the present application.

[0147] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0148] It should be noted that the terms "first", "second", and the like, used in the specification and the claims of the present application are intended to distinguish similar objects, but are not necessarily used to describe a particular order or sequence. It should be understood that the data used in this way can be interchanged, where appropriate, so that the embodiments of the present application described herein can be implemented in other than the order illustrated or described herein.

[0149] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical imaging device, characterized by, The optical imaging device has six pieces of lenses with optical power, and the optical imaging device comprises: A lens group, from the object side to the image side of the optical imaging device, the lens group comprises first to sixth lenses arranged in sequence, the first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, the fourth lens has positive optical power, the fifth lens has optical power, and the sixth lens has optical power; A spacer element group, the spacer element group at least comprises a first spacer element located between the first lens and the second lens and at least partially in contact with the image side surface of the first lens, a second spacer element located between the second lens and the third lens and at least partially in contact with the image side surface of the second lens, a third spacer element located between the third lens and the fourth lens and at least partially in contact with the image side surface of the third lens, a fourth spacer element located between the fourth lens and the fifth lens and at least partially in contact with the image side surface of the fourth lens, and a fifth spacer element located between the fifth lens and the sixth lens and at least partially in contact with the image side surface of the fifth lens; A lens barrel, the lens group and the spacer element group are accommodated in the lens barrel; Wherein, the half of the maximum half field angle Semi-FOV of the optical imaging device, the numerical aperture fno of the optical imaging device satisfy: 1 The effective focal length f of the optical imaging device and the effective focal length f1 of the first lens satisfy: -2.3 The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d1s of the object side surface of the first spacer element, and the effective focal length f1 of the first lens satisfy: -1.45 2. The optical imaging device of claim 1, wherein, The inner diameter d0s of the object side end surface of the lens barrel, the inner diameter d0m of the image side end surface of the lens barrel, and the curvature radius R1 of the object side surface of the first lens satisfy: 0.55 3. The optical imaging device of claim 1, wherein, The inner diameter of the second spacer element is the smallest among the inner diameters of all the spacer elements in the spacer element group, the inner diameter d2s of the object side surface of the second spacer element, the inner diameter d2m of the image side surface of the second spacer element, the inner diameter d1m of the image side surface of the first spacer element, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 0.5 4. The optical imaging device of claim 1, wherein, The inner diameter d2m of the image side surface of the second spacer element, the outer diameter D2m of the image side surface of the second spacer element, and the effective focal length f3 of the third lens satisfy: 0.5 5. The optical imaging device of claim 1, wherein, A distance EP01 in a direction of an optical axis of the optical imaging device from an object side end surface of the lens barrel to an object side surface of the first spacer element, a central thickness CT1 of the first lens on the optical axis satisfy: 1.4 < EP01 / CT1 < 2.45; a distance EP12 in the direction of the optical axis from an image side surface of the first spacer element to an object side surface of the second spacer element, a central thickness CT2 of the second lens on the optical axis satisfy: 0.8 < EP12 / CT2 < 1.

75.

6. The optical imaging device of claim 1, wherein, An inner diameter d3s of an object side surface of the third spacer element, a combined focal length f123 of the first lens, the second lens and the third lens satisfy: -0.4 < d3s / f123 ≤ 0.25; an inner diameter d3m of an image side surface of the third spacer element, a combined focal length f456 of the fourth lens, the fifth lens and the sixth lens satisfy: 0.65 < d3m / f456 < 1.

45.

7. The optical imaging device of claim 1, wherein, A central thickness CP3 of the third spacer element in a direction of an optical axis of the optical imaging device, a radius of curvature R7 of an object side surface of the fourth lens satisfy: 0 < CP3 / R7 < 0.

4.

8. The optical imaging device of claim 1, wherein, An outer diameter D3s of an object side surface of the third spacer element, an effective diameter DT32 of an image side surface of the third lens satisfy: 2.1 < D3s / DT32 < 4.45; an outer diameter D3m of an image side surface of the third spacer element, an effective diameter DT41 of an object side surface of the fourth lens satisfy: 1.85 < D3m / DT41 < 3.

9.

9. The optical imaging device of claim 1, wherein, An inner diameter d4m of an image side surface of the fourth spacer element, an inner diameter d5s of an object side surface of the fifth spacer element, an effective focal length f5 of the fifth lens, an effective focal length f6 of the sixth lens satisfy: -0.15 ≤ (d4m-f5) / (d5s-f6) < 15.

75.

10. The optical imaging device of claim 1, wherein, An inner diameter d0m of an image side surface of the lens barrel, an inner diameter d5m of an image side surface of the fifth spacer element, an effective focal length f6 of the sixth lens satisfy: -1.95 < (d0m-d5m) / f6 ≤ 0.

5.

11. The optical imaging device of claim 1, wherein, An effective focal length f of the optical imaging device, a distance L in a direction of an optical axis of the optical imaging device from an object side end surface of the lens barrel to an image side end surface of the lens barrel satisfy: 0.25 < f / L < 0.4.

Images